SINCE 1990
Split the inlet air between cells
An inlet manifold distributes air into parallel gaps between the cells. Heat travels from the cell surfaces into the moving air, which collects in the outlet manifold.
Industry Solution Pack · EN V1.0 · 2026-05
BESS · EV Fan Platform
BESS · EV Fan Platform
for the Lithium Battery Era
From BESS container internal cooling to ATEX emergency exhaust, from EV fast-charging cooling to lithium battery factory ventilation — a single 5-product EC platform spans 4 applications. Top-5 NA BESS 350-unit field validation · 1.8-second emergency start · 2,200+ units deployed.
2,200+
Units Deployed
BESS + EV + Battery Factory
1.8 sec
Emergency Start Response
vs ≤ 3-sec requirement; 350-unit measured
4 apps
Single-Supplier Coverage
Container · Exhaust · EV · Factory
90 days
ATEX Custom NPI
vs European 12-18 months
Why LONGWELL for BESS & EV Charging
Why BESS & EV Pick LONGWELL
Lithium batteries are reshaping power infrastructure, and forced air cooling and exhaust are the silent backbone of their safe operation. The customer's hidden pain isn't the cells — it's the ATEX explosion-proof exhaust, container thermal management, and charger cooling. Engineering failures in these "non-battery" subsystems can delay or sink the entire project. LONGWELL's market entry point is not supplying fans — it is delivering battle-tested thermal and exhaust engineering solutions end-to-end.
①
350-Unit REM ATEX EC Field Validation
350-Unit REM ATEX EC Field Validation
A Top-5 North American BESS manufacturer has 350 ATEX-explosion-proof EC fans deployed. NFPA 855 + 3-second emergency start + UL 9540A + customer 8D closed-loop all passed; measured 1.8s response, zero major incidents over 10 months, secured a 3-year priority supply agreement.
②
Single-Supplier 4-App Coverage
Single-Supplier 4-App + Unified Modbus
BESS container cooling + emergency exhaust + EV fast charging + battery factory — all 4 applications sourced from LONGWELL alone, with EC platforms sharing one Modbus register map. The customer BMS / FSC / charger controller integrates once.
③
90-Day ATEX NPI vs European 12-Month
90-Day ATEX NPI vs European 12 Months
European suppliers' ATEX custom NPI cycle is 12-24 months; LONGWELL is 90 days (validated on the 350-unit BESS project). A China-local Notified Body (TÜV NORD Shanghai) shortens the certification cycle by 60-70%.
④
ATEX-21 + High-Temp Coverage
ATEX-21 + High-Temperature Coverage
Lithium battery factory coating / formation workshops are Zone 21 — dust + electrolyte vapor coexist. RDH/AT ATEX-21 II 2D simultaneously passes dust + gas testing, with II 3GD combined marking available — one of the few Chinese suppliers with full ATEX coverage.
Key Quote
"Most fan suppliers can quote BESS exhaust on paper. Few can deliver 350 ATEX-certified units in 4 weeks. Even fewer can also handle the EV charger and the cathode workshop. LONGWELL is the rare one that delivers all three under one engineering organization."
— LONGWELL BESS / EV Strategy Brief, 2026 Q1
"Most fan suppliers can quote BESS exhaust on paper. Few can deliver 350 ATEX-certified units in 4 weeks. Even fewer can also handle the EV charger and the cathode workshop. LONGWELL is the rare one that delivers all three under one engineering organization."
— LONGWELL BESS / EV Strategy Brief, 2026 Q1
A Letter from the Founder
To Our BESS & EV Engineering Partners
To BESS OEMs, EPCs, storage owners, EV operators, and lithium battery factory engineering teams:
The BESS + EV fast-charging market is on a 35-45% CAGR through 2025-2030. But the customer's hidden pain isn't the cells — it's ATEX explosion-proof exhaust + container thermal management + charger cooling. Engineering failures in these "non-battery" subsystems can delay or sink the entire project. This is LONGWELL's market entry point in BESS / EV application engineering.
We don't supply fans — we deliver battle-tested thermal and exhaust engineering solutions end-to-end. LWBE3G backward-curved centrifugal serves BESS container cooling + EV fast-charge liquid heat-exchange; LWAE3G axial EC serves charger IGBT cooling + compact BESS cabinets; REM ATEX EC is the BESS emergency exhaust flagship — 350 units deployed at a Top-5 NA manufacturer; RDH/AT/ADH ATEX-21 covers lithium battery factory coating, formation, and module workshops.
This Pack documents our solution and engagement model. §1 lays out the 4-app architecture and value; §2 details the 5 core products; §3 maps each product to specific applications; §4 presents 3 flagship customer cases (2,200+ units combined); §5 and §6 cover the 90-day NPI and commercial terms.
Bruce Li
Founder & CEO, LONGWELL · bruce@zjlongwell.com
§1 · Four-Application Architecture
BESS / EV 4-Application Architecture + LONGWELL Product Mapping
Each of the four BESS / EV applications has distinct pressure, environment, certification, and noise requirements. LONGWELL's Industry Pack maps purpose-engineered fan series to each application — no compromise, no over-spec.
①
BESS Container Cooling
BESS Container Cooling
Container Cooling
Battery cabinet circulation + HVAC integration. Low noise, IP54-65, EN 50604-1 compliant.
300-800 Pa · IP54 · LWBE3G
②
BESS Emergency Exhaust ATEX
BESS Emergency Exhaust ATEX
Emergency Exhaust · Flagship
350 units at Top-5 NA BESS manufacturer. NFPA 855 + UL 9540A + 3-sec response.
1,000-1,500 Pa · Zone 22 · REM ATEX EC
③
EV Fast-Charging Cooling
EV Fast-Charging Cooling
Fast-Charging Cooling
350-600 kW charger internal cooling + liquid heat-exchanger fans. IP65 + EMC Class B.
400-1,000 Pa · IP65 · LWAE3G + LWBE3G
④
Lithium Battery Factory
Lithium Battery Factory
Battery Factory
Coating / formation / electrode workshop ATEX-21 dust extraction + factory ventilation. NMP/DMC vapors.
1,500-2,200 Pa · Zone 21 · RDH ATEX + ADH
Integrated Approach Value: (1) all EC platforms share Modbus register maps — customer BMS / FSC / charger controller integrates once and is compatible with all 4 applications; (2) ATEX and standard versions share interface dimensions — zero mechanical retrofit for upgrades; (3) the 4 applications share spare parts + service channels — unified inventory, unified application engineers; (4) single 8D closed-loop point of contact — no finger-pointing between vendors.
§2 · 5-Product Engineering Architecture
5-Product BESS / EV Engineering Architecture
REM ATEX EC, LWBE3G, LWAE3G, RDH ATEX, ADH — five product series each play a specific role across the 4 applications. The table below shows the overall mapping; details follow.
| Product | App | Engineering Role |
|---|---|---|
| REM ATEX EC ★ Flagship | ①+② | BESS emergency exhaust core + container exhaust high-pressure option — the only product with EC + ATEX + 1,500 Pa |
| LWBE3G | ①+③ | BESS container HVAC + EV fast-charge liquid heat-exchanger rear — mid-pressure EC centrifugal platform |
| LWAE3G | ③ | EV charger internal IGBT cooling + small BESS cabinet — compact low-pressure axial EC |
| RDH ATEX | ④ | Battery factory coating / formation dust collection main — 2,200 Pa + II 2D ATEX-21 |
| ADH | ④ | Battery factory workshop dilution ventilation — large airflow + optional ATEX-G |
★ Flagship Product: REM ATEX EC · BESS Emergency Exhaust
REM ATEX EC is the unique LONGWELL EC series that simultaneously offers (1) direct-driven EC integrated motor, (2) ATEX explosion-proof certification standard, and (3) 1,500 Pa pressure capability — the three hard conditions for BESS emergency exhaust. 350 units deployed at a Top-5 NA manufacturer (see §4 Case 1).
| Item | Specification |
|---|---|
| Impeller | Backward-curved profile, anti-static coating + G2.5 dynamic balance, ATEX grounding continuity ≤ 100 Ω |
| Motor | EC external-rotor + ATEX certified (WEG/Siemens) + sealed driver, 0-10V / PWM / Modbus RTU / BACnet full protocols |
| Max Pressure | 1,500 Pa · typical BESS emergency operating point 1,000-1,200 Pa |
| Airflow | 4,000 - 25,000 m³/h (Ø 355 - 800 mm), single unit covers a 250 kW BESS container |
| ATEX Marking ★ | II 3D Ex tc IIIB T125°C Zone 22 standard · optional II 3GD combo (Zone 22 + Zone 2 thermal runaway gas) |
| Emergency Start | Siemens FailSafe / dry contact trigger → 1.8s to 80% speed (req. ≤ 3s) → 7.5s to rated (req. ≤ 10s) |
| UL Cert. | UL 507 + UL 1004-1 + NA NRTL ATEX equivalent (Class I Div 2 + Class II Div 2) |
| BMS Integration | Modbus RTU + dry contact emergency input + fault alarm push to plant safety system (Siemens FailSafe / Rockwell GuardLogix validated) |
| Size Range | REM 355 / 400 / 450 / 500 / 560 / 630 / 710 / 800 (Ø 450 is the mainstream BESS size) |
REM Performance Reference Points
| Model | Airflow | Pressure | Power | Efficiency η |
|---|---|---|---|---|
| REM 400 ATEX EC | 6,500 m³/h | 1,000 Pa | 2.8 kW | 72% |
| REM 450 ATEX EC ★ Mainstream | 9,200 m³/h | 1,200 Pa | 4.2 kW | 75% |
| REM 500 ATEX EC | 12,500 m³/h | 1,300 Pa | 5.8 kW | 76% |
| REM 560 ATEX EC | 16,800 m³/h | 1,400 Pa | 7.5 kW | 77% |
★ REM 450 is the mainstream size for BESS emergency exhaust on 250-500 kW containers (350-unit case standard).
LWBE3G · BESS Container Cooling + EV Fast-Charge Liquid Heat Exchange
LWBE3G is LONGWELL's backward-curved EC centrifugal fan platform, serving two roles in BESS / EV: (1) BESS container HVAC + battery cabinet circulation; (2) EV fast charger (350-600 kW) liquid heat-exchanger rear-radiator cooling.
| Dimension | BESS Container Config | EV Charger Config |
|---|---|---|
| Typical Size | Ø 280 / 310 / 355 mm | Ø 250 / 280 / 310 mm |
| Airflow | 3,000 - 8,000 m³/h | 2,000 - 5,500 m³/h |
| Pressure | 400 - 800 Pa | 600 - 1,000 Pa |
| Enclosure | IP54 (container interior) | IP65 (outdoor charger) |
| EMC | Class A sufficient | Class B required (no PLC/5G interference) |
| Operating Temp. | -30°C to +55°C | -40°C to +60°C wide-range outdoor |
| Noise Lp @ 1m | ≤ 65 dB(A) | ≤ 58 dB(A) (residential) |
| Control Interface | Modbus RTU + 0-10V | Modbus RTU + CAN Bus |
LWAE3G · EV Charger Internal IGBT Cooling + Compact BESS Cabinet
LWAE3G is the axial EC platform — the right answer for compact, low-pressure, high-airflow cooling. Two scenarios: (1) EV fast charger internal IGBT / power module cooling; (2) small-format BESS cabinets (≤ 100 kWh) where space and noise constraints apply.
| Item | Specification |
|---|---|
| Impeller Type | Axial, 7-9 composite blades, CFD-optimized for low drag + low noise |
| Size Range | Ø 200 / 250 / 280 / 315 / 350 / 400 mm (EV chargers use 250-315 mm) |
| Airflow | 800 - 6,000 m³/h (scales with size) |
| Pressure | 80 - 350 Pa (typical axial range) |
| Motor | EC external-rotor, 24V DC / 48V DC supply (EV charger DC bus compatible) + 0-10V/PWM/Modbus/CAN |
| Enclosure | IP65 outdoor standard · IP67 optional (coastal high-humidity) |
| Noise | ≤ 55 dB(A) @ 1m · EV residential-zone compliant |
| EMC | EN 55014 Class B + FCC Part 15B + CE |
▸ LWAE3G vs LWBE3G Selection Logic · Typical Charger Combination
Choose LWAE3G when: pressure ≤ 350 Pa + compact space (charger interior / small BESS cabinet) + fan blows directly toward IGBT or battery module
Choose LWBE3G when: pressure 400-1,000 Pa + longer airflow path (container long ducts / liquid heat-exchanger rear) + higher airflow demand
Typical EV fast charger combination: LWAE3G (internal IGBT cooling) + LWBE3G (liquid heat-exchanger rear) — single charger uses 8-12 LWAE3G + 2-4 LWBE3G
RDH ATEX · Battery Factory Coating / Formation Workshop Dust Collection
RDH ATEX is the heavy-duty industrial dust-collection workhorse. Lithium battery coating (positive / negative electrode) + formation workshops are ATEX Zone 21 (frequent dust), requiring II 2D Cat. 2. RDH ATEX-21 is one of the few Chinese products covering this severity level.
| Item | Specification |
|---|---|
| ATEX Marking ★ | II 2D Ex tb IIIB T125°C Da Zone 21 — globally one of the few products passing dust + lithium electrolyte gas testing |
| Max Pressure | 2,200 Pa (typical coating workshop 1,800-2,000 Pa) |
| Airflow | 8,000 - 40,000 m³/h (RDH 400-630) |
| Impeller | Backward-curved 11 blades + anti-static epoxy coating + G1.0 industrial dynamic balance + fully welded steel construction |
| Motor | WEG ATEX-21 IE4 + external VFD + winding PTC + bearing PT100 dual temperature monitoring |
| Typical Use | Cathode coating dust collection / anode graphite coating dust / formation workshop exhaust / electrolyte room ventilation |
| Compliance | NFPA 484 (metal dust) + NFPA 654 (dust control) + GB 50058 + IECEx |
ADH · Lithium Battery Factory Workshop Ventilation
ADH (heavy-duty forward-curved belt-driven) handles large-airflow facility ventilation in lithium battery factories: dilution ventilation, area supply air, and 5,000+ m² factory RTU evaporator service. Standard and ATEX-G versions both available.
| Item | Specification |
|---|---|
| Airflow | 20,000 - 60,000 m³/h (battery factory mainstream sizes) |
| Max Pressure | ≤ 1,000 Pa |
| ATEX Options | ✓ II 3G ATEX Zone 2 (electrolyte rooms) + II 3D Zone 22 (dust environments) |
| Typical Use | Workshop dilution ventilation / factory supply air / large RTU evaporators / module assembly air circulation |
Engineering Value of II 3GD Combined Marking
The lithium battery factory hidden challenge: the coating workshop is a Zone 21 dust environment, but formation cabinets + electrolyte rooms release DMC/EMC vapors classified as Zone 2 gas — and the two coexist. LONGWELL RDH ATEX-GD and AT ATEX-GD simultaneously pass II 2D + II 3G testing, letting customers use one fan type for mixed environments — substantially simplifying spare parts management.
The lithium battery factory hidden challenge: the coating workshop is a Zone 21 dust environment, but formation cabinets + electrolyte rooms release DMC/EMC vapors classified as Zone 2 gas — and the two coexist. LONGWELL RDH ATEX-GD and AT ATEX-GD simultaneously pass II 2D + II 3G testing, letting customers use one fan type for mixed environments — substantially simplifying spare parts management.
§3 · Application Detail · BESS Container Reference BOM
BESS Container Cooling & HVAC Integration Reference Configuration
Modern utility-scale BESS containers (1-5 MWh) require multiple coordinated airflow systems: (1) battery cabinet internal circulation to equalize cell-to-cell temperature; (2) container-level HVAC for ambient regulation; (3) routine operation exhaust. LONGWELL LWBE3G + LWAE3G + REM platforms together cover all three.
Application principle · Air-cooled battery cabinet
Why Battery Airflow Must Reach Every Cooling Channel
In an air-cooled battery module, cells release heat while charging or discharging. A fan moves cooling air, but the total volume alone cannot tell us whether every cell receives enough.
Inside the equipment01 02 03 04
Follow the air through the process
Unequal passages divide the flow unevenly
The pressure along the manifolds and the resistance of each gap affect its airflow. A restricted branch can receive less cooling even while other branches carry substantial air.
Look at the local heat path
Air must pass beside the cell surface. It cannot cool a missed region merely by rushing through an easier bypass. Differences in local airflow can create differences in cell temperature.
Design the distribution with the fan
Channel spacing, manifold shape and sealing must work with the chosen fan. Verify the loaded module at its intended inlet temperature and duty. This schematic shows airflow distribution, not a prediction of battery safety.
Airflow function
- In the module air-handling path, supplying the inlet manifold that divides cooling air between cells.
- A backward-curved centrifugal family can be evaluated where the manifold, filters and narrow channels create an appreciable pressure requirement. The fan and distribution geometry need to be selected together.
What can change the result
- A restricted cell gap or an easier bypass can receive a different share of the total airflow.
Operating requirements
Start with the complete air path
Share your layout and the information you already have. Unknown values can be identified before a configuration is selected.
01Airflow through each branch
02Module heat load and inlet temperature
03Manifold, filter and channel resistance
LONGWELL fan options
Match the fan to this air path
LONGWELL EC backward-curved centrifugal family can be evaluated for this duty. A backward-curved centrifugal family can be evaluated where the manifold, filters and narrow channels create an appreciable pressure requirement. The fan and distribution geometry need to be selected together.
Where it sits
In the module air-handling path, supplying the inlet manifold that divides cooling air between cells.
Why consider this configuration
A backward-curved centrifugal family can be evaluated where the manifold, filters and narrow channels create an appreciable pressure requirement. The fan and distribution geometry need to be selected together.
Check the result in your equipment
Measure individual branch delivery and cell temperatures in the loaded module at the specified inlet condition.
Confirm the selected fan operating point using the complete installed air-path resistance.
Confirm mounting, supply and controls with LONGWELL before integrating the selected assembly.
Discuss your battery cooling channels
Send airflow through each branch, module heat load and inlet temperature, manifold, filter and channel resistance. Ask LONGWELL to review a suitable configuration, fan curve, drawing and control details. A layout or existing fan model can start the review.
A layout, installation photos or your existing model is enough to start the discussion.
Engineering references
Key Engineering Challenges
| Cell Temperature Uniformity ±2°C | Lithium battery cycle life is temperature-sensitive; temperature delta > 5°C accelerates capacity fade by 30%. LWBE3G + ducting design delivers ±2°C uniformity. |
| IP54 Dust + Splash Protection | Outdoor BESS container interior cooling fans require IP54 to withstand outdoor dust + occasional rain ingress. LWBE3G container variant ships with IP54 standard. |
| Wide-Temperature Start at -30°C | Cold-region North America deployments (Wyoming / Alberta) require -30°C winter starts; EC driver needs low-temperature preheat mode. |
| BMS Synchronized Control | Multi-fan arrays (12-24 units per container) require Modbus master/slave synchronization to prevent phase-drift induced vortex vibration. |
BESS Container · Recommended Configuration
LONGWELL Recommended Single-Container Configuration
4 subsystems, 4 product types — a single container fan BOM totals 13-24 fans, all sharing the same Modbus register map. Single-supplier integration = OEM BMS developed once, deployed across thousands of containers.
Temperature Uniformity Target
±2°C
Emergency Start (350-Unit Measured)
1.8 sec
| Subsystem | Product | Quantity & Configuration |
|---|---|---|
| Battery Cabinet Circulation | LWBE3G Ø 250-280 | 8-16 units / container, Modbus master/slave sync |
| Container HVAC | LWBE3G Ø 310-355 | 2-4 units / container, supply + return air loop |
| Routine Exhaust | LWAE3G Ø 280-315 | 2 units / container, continuous low-speed operation |
| Emergency ATEX | REM ATEX EC Ø 450 | 1-2 units / container, FailSafe-triggered |
EV Fast Charging 350-600 kW · Two Cooling Architectures
Fast charging at 350-600 kW per port generates 15-40 kW of waste heat — far above what passive cooling can handle. Modern fast chargers use forced air or liquid cooling, both requiring engineered fan systems. LONGWELL covers both architectures.
| Architecture | Forced Air | Liquid-Cooled |
|---|---|---|
| Typical Power | ≤ 350 kW | 350-600 kW |
| Components Cooled | IGBT + transformer + inductor | IGBT + charging gun + liquid loop |
| LONGWELL Internal Cooling | LWAE3G Ø 280 × 8-12 units | LWAE3G Ø 250 × 6-8 units |
| LONGWELL Heat-Exchanger Fans | LWBE3G Ø 280 × 2-4 units | LWBE3G Ø 310 × 4-6 units |
| Total Noise Lp @ 1m | ≤ 60 dB(A) | ≤ 58 dB(A) (residential + 5G no interference) |
WATCH THE APPLICATION PRINCIPLE · ENGLISH
Why liquid-cooled EV chargers still need fans
Follow heat from a charger power module through its cold plate and coolant to a liquid-to-air radiator. The pump moves the liquid; air driven through the radiator carries that heat into the surroundings.
English narration and on-screen captions · 78 seconds · Equipment and flow paths are schematic.
Product scope in this film: This film covers the air-side heat rejection of a liquid-cooled charging power cabinet. LONGWELL backward-curved EC fans are a family-level candidate, subject to the radiator and complete air-path duty. It does not demonstrate a battery-storage cabinet.
Explore the LONGWELL fan family · Share your equipment and air-path requirements
Lithium Battery Factory · 3-Workshop Configuration
| Workshop | Process Characteristics | Recommended Configuration |
|---|---|---|
| Cathode / Anode Coating | Metal dust (Ni/Co/Mn/graphite) + Zone 21 frequent dust + NMP vapor | RDH ATEX-21 II 2D dust collection main (1,800-2,200 Pa) + AT ATEX-21 mid-stage booster |
| Formation Workshop | DMC/EMC vapor + occasional HF + Zone 2 gas environment | AT ATEX-G II 3G exhaust + ADH ATEX-G workshop dilution + 316L stainless impeller (HF resistant) |
| Electrode / Module Assembly | Standard cleanroom + localized occasional dust + general air circulation | LWBE3G + AT standard + ADH workshop ventilation (general industrial, no ATEX) |
§4 · Certifications & Test Reports
BESS / EV Certification Matrix + Test Report Library
LONGWELL BESS / EV products ship with the regulatory framework required for global deployment. The matrix below shows certification coverage across the 5 core products in this Pack. Gold-marked items carry the highest weight in BESS customer audits.
Product Certification Inventory
| Certification | Standard | Applicable Products |
|---|---|---|
| CE | EU Machinery / EMC / LVD | All 5 products |
| ATEX ★ | ATEX 2014/34/EU Zone 21/22 + Zone 2 | REM · RDH · AT · ADH ATEX |
| IECEx | IECEx Scheme global ATEX recognition | Same coverage as ATEX |
| UL 9540A ★ | BESS thermal runaway large-scale fire test | REM ATEX EC pass (350-unit case) |
| UL 507 + UL 1004-1 | NA electrical safety (fan + motor) | REM · LWBE3G · LWAE3G NA variant |
| NFPA 855 + NFPA 70 ★ | BESS installation fire / explosion compliance | REM ATEX EC emergency exhaust compliant |
| EN 50604-1 | EU secondary battery system safety | LWBE3G BESS container variant |
| IEC 62933-5 | Electrical energy storage system safety | LWBE3G + REM ATEX EC combined solution |
| GB/T 36276 + GB 51048 | China BESS lithium battery + station design | All 5 products |
| EMC Class B | EN 55014-1/-2 + FCC Part 15B | LWBE3G EV + LWAE3G EV (required) |
| ISO 9001 / 14001 / 45001 | Quality / environment / occupational safety | ✓ Certified |
BESS / EV Test Report Library
T1 = PDF within 1 business day; T2 = scheduled at named lab. T1-T2 reports complimentary for project-intent customers (NDA-signed or RFP-issued). The complete ATEX + UL 9540A + emergency response test reports from the 350-unit REM ATEX EC BESS case are available as a flagship reference package.
| Test Type | Standard | Coverage | Status |
|---|---|---|---|
| ATEX Type Test Zone 22 | EN 60079 + IECEx ExTR | REM · RDH · AT · ADH | ✓ T1 Ready |
| ATEX Zone 21 (frequent dust) | EN 60079-31 IIIC Da | RDH ATEX-21 · AT ATEX-21 | ✓ T1 Ready |
| II 3GD Combined (dust+gas) | ATEX dual certification | REM ATEX-GD · RDH ATEX-GD | ✓ T1 Ready |
| 3-Second Emergency Start | LONGWELL internal + customer acceptance | REM ATEX EC (BESS) | ✓ T1 Ready |
| UL 9540A Subsystem Pass | UL 9540A Cell-level + Module | REM ATEX EC | ✓ T1 Ready |
| EMC Class B Verification | EN 55014 + FCC Part 15B | LWBE3G EV + LWAE3G EV | ✓ T1 Ready |
| Wide-Temperature Start -40°C | IEC 60068-2-1 cold start | LWBE3G EV · LWAE3G EV · REM | ✓ T1 Ready |
| IP65 Protection Rating | IEC 60529 IP65 full test | LWBE3G EV · LWAE3G EV | ✓ T1 Ready |
| HF Corrosion 316L Validation | ASTM A480 + HF exposure | AT 316L · RDH 316L (formation) | ◐ T2 (2026 Q3) |
| Modbus + CAN Interoperability | Modbus RTU + CAN 2.0B | LWBE3G EV · LWAE3G EV | ✓ T1 Ready |
BESS Emergency Exhaust Thermal Runaway Compliance Framework
| Region | Core Standard | Exhaust Requirement |
|---|---|---|
| North America | NFPA 855 + UL 9540A | Smoke concentration triggered + forced exhaust 5 ACH |
| European Union | EN 50604-1 + IEC 62933-5 | Flammable gas (HF / fluorides) forced below 25% LEL |
| China | GB/T 36276 + GB 51048 | Thermal runaway triggers forced exhaust until safe gas threshold |
| International | IEC 60079 + ATEX 2014/34/EU | Thermal runaway gas + lithium dust = II 3GD combined marking |
§4 · Three Flagship Customer Cases · 2,200+ Units
3 Flagship Cases: NA BESS · Korean Battery Fab · European EV
Three flagship deployments across BESS emergency exhaust, lithium battery factory, and EV fast-charging applications — 2,200+ units delivered in 18 months, in service across North America, Asia, and Europe.
★ CASE 1 · 350 UNITS · TOP-5 NORTH AMERICAN BESS MANUFACTURER
Top-5 NA BESS Manufacturer · 350 Units REM ATEX EC
Customer name disclosable under separate NDA. Data verified by LONGWELL PMO and confirmed by customer's procurement and safety teams.
Project Context · 2024 Q4
A Top-5 NA BESS manufacturer building Texas + Nevada lithium battery factories with a 2025 capacity target of 20 GWh. A 2024 Q3 safety audit identified that cell coating + formation workshops lacked sufficient emergency exhaust to comply with NFPA 855 + OSHA. The customer was given a 6-month timeline to retrofit the ATEX explosion-proof exhaust system, involving approximately 350 high-pressure blowers.
Hard Requirements
- ATEX: II 3D Ex tc IIIB T125°C Zone 22 full compliance + Notified Body number
- Emergency Response: ≤ 3-second emergency start; 0 → rated speed ≤ 10 seconds
- BMS Integration: Modbus RTU + dry contact emergency input, interlocked with Siemens FailSafe
- Delivery: first batch of 80 units within 4 weeks; remaining 270 units within 4 months in staged batches
- UL: UL 507 + UL 1004-1 + NA NRTL ATEX equivalent certification
LONGWELL Solution & Project Outcomes
| Metric | Required | Achieved |
|---|---|---|
| ATEX Certification Coverage | II 3D Cat. 3 full compliance | All 350 units passed |
| Emergency Start Response | ≤ 3 seconds | 1.8 sec (measured) |
| 0 → Rated Speed | ≤ 10 seconds | 7.5 sec (measured) |
| First 80 Units Delivery | 4 weeks | 3.5 weeks ahead of schedule |
| Field Quality Incidents (10 months) | ≤ 1% | Zero major incidents |
| 2025 Full-Year Orders | — | Additional 350 units (REM 500 / 560) |
| Frame Agreement | — | 2025-2027 three-year priority supply |
"LONGWELL was the only vendor — Chinese or otherwise — who could deliver an ATEX-certified, UL-certified EC blower with 3-second emergency start AND meet our 4-week first-batch deadline. The REM series is now our default ATEX exhaust platform across all new factory builds."
— Director of Manufacturing Safety, Top-5 NA BESS Manufacturer (disclosable after NDA)
★ CASE 2 · 220 UNITS · KOREAN TOP-3 LITHIUM BATTERY MANUFACTURER
Korean Top-3 Lithium Battery Manufacturer · Coating + Formation · 220 Units
Customer name disclosable under separate NDA. Project executed 2024-2025 across two factory sites in Korea.
Project Context
A Korean top-3 lithium battery manufacturer invested in 2024 in new-generation 21700 cylindrical + 4680 large-format cylindrical cell production lines, total annual capacity 35 GWh. New factory coating + formation workshops required a complete ATEX-21 explosion-proof ventilation system. Korean-specific requirement: products must pass KCs (Korea Certification, ATEX equivalent) compliance + Korean-language technical documentation.
LONGWELL Solution
- Coating Workshop: RDH 500 ATEX-21 II 2D × 24 units (dust collection main) + AT 18-18 ATEX-21 × 36 units (mid-stage booster)
- Formation Workshop: AT ATEX-G II 3G × 48 units + ADH ATEX-G × 28 units + 316L stainless impellers (HF resistant)
- Electrode / Module: LWBE3G × 56 units + AT × 28 units (general industrial, no ATEX)
- Localization: 100% Korean-language nameplates + technical docs + Modbus register table + KCs equivalent certification
Project Outcomes
| Total Units | 220 units (coating 60 + formation 76 + electrode/module 84) |
| Delivery Cycle | 7 months complete (customer required 9 months) — 2 months ahead |
| ATEX-21 + ATEX-G Pass | All 220 units passed third-party ATEX acceptance |
| Cost Savings vs Korean Local Supplier | 32% equipment cost + 5-month delivery advantage |
| Follow-on Cooperation | 2026-2028 phase 2 + phase 3 factory frame agreement |
★ CASE 3 · 1,680 UNITS · 120 STATIONS · EUROPEAN TOP-3 FAST-CHARGING OPERATOR
European Top-3 Fast-Charging Operator · 120 Stations · 1,680 Units
Customer name disclosable under separate NDA. Project executed 2024-2025 across Germany / Netherlands / France.
Project Context
The customer launched a 120-station deployment of 350 kW + 600 kW fast chargers in 2024. Pain points: the original solution used Ebmpapst fans, but 600 kW stations exceeded the 55 dB residential nighttime noise limit + northern cold regions failed -30°C cold start + EMC interfered with 5G communication. Required re-selection and 120-station deployment within 6 months.
LONGWELL Solution
- Charger Internal IGBT Cooling: LWAE3G Ø 280 EV variant × 10 units per charger (low-noise EC + DC bus supply + EMC Class B)
- Liquid Heat-Exchanger Rear: LWBE3G Ø 310 EV variant × 4 units per charger (IP65 + wide-temp -40°C + Class B + ≤ 58 dB)
- Local Integration: Modbus + CAN dual-protocol; zero-modification compatibility with charger controllers (ABB / Siemens)
Project Outcomes
| Total Units | 1,680 units (120 stations × 14 fans per charger) |
| Delivery Cycle | 4.5 months complete (customer required 6 months) — 1.5 months ahead |
| Nighttime Noise Measured | 52 dB(A) @ 7m (required ≤ 55 dB) |
| -30°C Cold-Start Pass Rate | 100% (Ebmpapst original < 60%) |
| Cost vs Ebmpapst Re-Selection | 38% cost reduction + 1.5 months schedule savings |
3-Case Pattern Defining LONGWELL's BESS / EV Position
| Metric | Case 1 BESS | Case 2 KR Battery Fab | Case 3 EU EV |
|---|---|---|---|
| Application Dimension | ② Emergency Exhaust ATEX | ④ Battery Factory | ③ EV Fast Charging |
| Total Units | 700 REM ATEX EC | 220 (4 series) | 1,680 (2 series) |
| Region | North America (TX + NV) | Korea | DE / NL / FR |
| Flagship Technical Differentiator | 3-sec emergency start | ATEX-21 + KCs | ≤ 58 dB + -40°C |
| Schedule Lead | 3.5 weeks vs 4 weeks | 2 months ahead | 1.5 months ahead |
| Cost Savings vs Original Plan | — (new build) | 32% vs Korean local | 38% vs Ebmpapst |
| Follow-on Cooperation | 3-year frame agreement | Phase 2/3 factory frame | Renewal 200-station expansion |
Case Pattern Summary: LONGWELL's BESS / EV market position is defined by three consistent patterns: (1) solving customer hidden pain points (emergency response / ATEX-21 dual / noise + EMC) rather than competing on price alone; (2) 90-day NPI vs 12-month delivers 1-2 months ahead of schedule; (3) first-order excellence converts to multi-year frame agreements — customers stop re-tendering.
§5 · Engineering Support
BESS / EV-Specific Engineering Support
LONGWELL provides BESS / EV customers with the engineering tools needed to integrate the 5-product solution efficiently — shared Modbus register maps, shared CAD interfaces, single CFD service entry point.
| Tool | Purpose | Access |
|---|---|---|
| BESS Emergency Exhaust Sizing Calculator | Input container capacity (kWh) + indoor free volume + 5 ACH exhaust requirement → returns required REM ATEX EC quantity + size + ductwork design recommendations | Free |
| EV Fast Charger CFD Service | Customer provides charger internal 3D model → LONGWELL completes full-operating CFD + fan layout optimization + noise prediction + EMC evaluation | Project-intent free |
| Battery Factory ATEX Zoning Assessment | Based on customer factory process + media + exhaust scale, provides Zone 21 + Zone 2 zoning map + fan ATEX rating matching list | NDA access |
| Modbus + CAN Protocol Manual | BESS BMS (Siemens FailSafe / Rockwell GuardLogix) + EV ECU (ABB / Siemens) validated integration checklist | NDA access |
| 3D CAD Library + ATEX Interfaces | 5 products in STEP / IGES / Parasolid all sizes + ATEX variant interface dimensions + container mounting base drawings | NDA access |
| UL 9540A Compliance Support | REM ATEX EC has passed UL 9540A cell-level + module testing; LONGWELL provides complete test reports for customer BESS system-level UL 9540A application | BESS customers free |
BESS / EV Field Application Engineering
BESS / EV strategic customers receive on-site Field Application Engineering: North American engineers deploy 2-4 weeks at customer factory for ATEX acceptance + Modbus commissioning + customer / owner sign-off; European engineers serve DE / NL / FR EV customers; Korea / China / SEA covered by Shanghai + Ningbo teams.
90-Day Custom NPI + Reliability
90-Day Custom NPI + Reliability Framework
If standard configurations don't fully match your BESS / EV application, LONGWELL offers the same structured 90-day NPI cycle that delivered the 350-unit BESS case and the 120-station EV case — vs European competitors Ebmpapst / Nicotra at 12-18 months.
| Stage | Engineering Actions | Customer Involvement |
|---|---|---|
| S1 · Day 1-14 Requirements | Operating point + ATEX zone + BMS/ECU protocol + timeline window | Provide container volume / emergency ACH / ATEX rating / BMS vendor / charger power · 1-2 meetings |
| S2 · Day 15-45 CFD + ATEX Design | Full-system CFD + ATEX compliance design + 3D model | LONGWELL-led; customer receives CFD simulation + performance prediction + ATEX compliance documents + 3D + noise + EMC predictions |
| S3 · Day 46-70 Sample + DV | Engineering samples + customer integration + DV | 3-5 samples + ATEX type test + UL 9540A subsystem validation + customer factory integration testing |
| S4 · Day 71-90 PV + MP Release | DV/PV + ATEX third party + first shipment | ATEX Notified Body third-party acceptance (TÜV NORD / SGS) + UL 9540A system-level validation support + production process documentation + first order |
Pre-Shipment 100% Reliability Testing (BESS / EV Specific)
| 100% Online Performance Test | Per unit: airflow / pressure / RPM / current / voltage / vibration / noise / EMC scan; data stored in MES linked to serial number |
| BESS Emergency Start 100% | Every REM ATEX EC unit 100% tested for 3-sec response → measured 1.8 sec average; data included in packing list delivered to customer |
| ATEX 100% Individual Certification | ATEX variants ship with individual unit certificates + Notified Body numbers; Notified Body samples 1% |
| Wide-Temp Start 100% | EV variant LWBE3G / LWAE3G per unit: -30°C cold start + 60°C full-load test |
| L10 Accelerated Aging (Batch) | Per batch 5 units 1,500h + 60°C accelerated aging, L10 = 60,000h @ 40°C (BESS 10-year project lifecycle) |
Warranty Policy (BESS / EV Enhanced)
| Commitment | Terms |
|---|---|
| Standard Warranty | BESS / EV applications 12 months as standard; extended terms for ATEX variants agreed per contract |
| BESS Project Extended Warranty | 48-60 months (aligned with BESS container 5-10 year warranty; first 36 months at no cost) |
| MTBF Commitment | 60,000 hours @ 40°C (BESS 10-year @ 5,000h/yr operating profile) |
| Regional Spare Parts Depot | BESS projects ≥ 5% project volume + critical ATEX spares 100% interchange compatibility for 24 months |
| 8D Field Response | 24h receive → 5 working-day root cause → 15 working-day correction + emergency on-site within 48h |
OEM / EPC Commercial Terms
Delivery
Monthly rolling forecast + 30-day PO + consignment inventory (regional spare parts depot), guaranteeing 30-45 day delivery.
Pricing
Annual-volume tiered pricing; 500+ container customers receive an additional 8-12% discount.
Application Engineers
OEM customers receive 1-2 dedicated named application engineers for long-term product roadmap coordination.
Extended Warranty
48-60 months (aligned with BESS container 5-10 year warranty policy).
§6 · How to Engage
Select a model for this applicationLONGWELL Fan Selector — every model with its catalogue curve, datasheet and drawing. No login.
Four Engagement Paths
Four ways to move from this Industry Pack to a working partnership — by customer type: BESS OEM / EV operator / lithium battery factory EPC / utility storage project owner.
A
BESS Emergency Exhaust Fast Quote
BESS Emergency Exhaust Fast Quote
Send BESS container capacity (kWh) + ATEX zone + BMS vendor → within 48 hours receive REM ATEX EC model + quantity + emergency-start validation documents + pricing.
⏱ 48-hour response · No NDA required
Send Parameters →
B
EV Fast Charger CFD Engineering
EV Fast Charger CFD Engineering
Sign NDA → provide charger internal 3D model → LONGWELL completes CFD + fan layout + noise + EMC evaluation → LWAE3G / LWBE3G configuration proposal + pricing.
⏱ 2-3 weeks · After NDA
Request CFD →
C
Battery Factory EPC Master Plan
Battery Factory EPC Master Plan
EPC general contractor / owner → sign NDA → factory process review + ATEX zoning assessment → coating / formation / module / facility ventilation full-factory fan BOM + frame agreement.
⏱ 4-8 weeks · NDA + process review
EPC Master Plan →
D
Utility-Scale Storage Stations
Utility-Scale (GW) Storage Stations
IPP / utility / EPC project owner → sign NDA → long-term cooperation agreement → lock model / unit price / delivery SLA + application engineer field support.
⏱ Long cycle · Strategic engagement
Start Strategic Engagement →
Dedicated BESS / EV Contact
BESS / EV Sales Contact
International Business
sales@longwellfans.com
Mark subject as "BESS / EV" for accelerated routing
Headquarters
www.longwellfans.com
Xuhe 100, Ditang Street, Yuyao, Ningbo, Zhejiang 315400, China
REM ATEX EC · LWBE3G · LWAE3G · RDH · ADH
Cool Cells. Safe Cells. Engineered for the Energy Storage Era.
One supplier across 4 BESS / EV applications — BESS Container · Emergency Exhaust ATEX · EV Fast Charging · Battery Factory. Where lithium scales, LONGWELL keeps it cool and safe.