How to Communicate Your Battery Requirements to Manufacturers Effectively | Huawen New Power

Contents

Why Great Communication Matters
The 10 Must-Have Specification Items
Decision Flow: Choose Cell Chemistry & Topology
Specification Tables (copy & fill)
Environmental & Compliance
BMS & Interfaces
Verification Plan & Pilot Run
Requirement Checklist & Email Template
Common Pitfalls & How to Avoid
Work with Huawen New Power

1) Why Great Communication Matters

Ambiguity in early requirements often leads to re-designs, schedule slips, and cost growth. Clear, quantified specs enable a manufacturer to propose the right cell, BMS, and mechanical design on the first quote.

Goal: First-time-right design

Focus: Quantified loads, environment, safety & standards

Outcome: Fewer ECOs, faster DVT/PVT

2) The 10 Must-Have Specification Items

Electrical: Nominal/Min/Max voltage; capacity (Wh/Ah); peak & continuous discharge current; charge current & profile; ripple limits.
Duty Profile: Load curve vs. time (average, peaks, duration, duty cycle); start-up inrush; regeneration if any.
C-Rate Use Cases: Max C-rate for charge/discharge, burst duration, cooling assumptions.
Lifecycle Targets: Cycle life at X DoD & Y C, and calendar life at storage SoC/temperature.
Mechanical: Max envelope (L×W×H), mass, mounting points, connector & harness routing, ingress protection.
Thermal: Ambient range (operating & storage), heat rejection, airflow constraints, surface temperature limits.
Safety/Compliance: Target standards (UN38.3, IEC 62133, UL 2054/UL 2271/UL 2580, ISO 13849, CE/UKCA), transport class, MSDS needs.
BMS/Interface: Protections, balancing, comms protocol (CAN/RS485/UART), SOC/SOH accuracy, logging, GUI/API needs.
Environmental & Reliability: Vibration/shock (IEC 60068), humidity, altitude, salt fog, chemicals, expected MTBF/field reliability.
Business: Target price band, annual volume, pilot build size, lead time, warranty/after-sales expectations.

Tip: If any item is unknown, share constraints instead (e.g., “enclosure volume ≤ 1.2 L” or “surface ≤ 55 °C at 1C continuous”). Constraints guide a safe design space.

3) Decision Flow: Choose Cell Chemistry & Topology

This schematic helps align expectations quickly. We’ll refine with load profiles, pack layout, and safety cases in the RFQ.

4) Specification Tables (copy & fill)

4.1 Electrical & Duty Profile

Parameter	Target / Range	Notes
Nominal Voltage / Range	e.g., 48 V (42–54.6 V)	State min/max including transient limits
Capacity (Ah / Wh)	e.g., 50 Ah / 2400 Wh	At 25 °C, 0.2C reference
Discharge Current	Continuous: 50 A; Peak: 120 A/10 s	Define peak duration & repeatability
Charge Current / Profile	Std: 10 A; Fast: 25 A	CC/CV, taper cutoff, termination current
Duty Cycle	e.g., 30 min @ 0.5C + 5 s peaks @ 2C	Attach load curve if available
Ripple / Noise	<100 mVpp	At pack terminals, 10–100 kHz
Regeneration	No / Yes (x A, y s)	Braking/regen profile if present

4.2 Mechanical & Interfaces

Parameter	Target	Notes
Max Dimensions (L×W×H)	e.g., ≤ 360 × 180 × 120 mm	Include tolerance
Mass	e.g., ≤ 8.0 kg	With harness/connectors?
Mounting	4× M6 bosses, 100 mm pattern	Drawings preferred
Connectors	Power: XT90; Signal: M12-5pin	Pinout + keying
Ingress Protection	IP54 / IP65	State test method

4.3 Thermal & Environment

Parameter	Target	Notes
Operating Temp	-20–55 °C (charge 0–45 °C)	Storage -40–85 °C if applicable
Cooling	Natural / Forced 1.5 m/s	Max surface temp ≤ 60 °C
Altitude	≤ 3000 m	De-rating curve if higher
Humidity	5–95% RH, non-condensing	Salt fog? Chemicals?
Shock/Vibration	IEC 60068-2-6/27	Vehicle profile if needed

5) Environmental & Compliance

Transport: UN38.3 test summary & shipping classification
Safety: IEC 62133-2 / UL 2054 / UL 2271 / UL 2580 (as needed)
EMC: EN 61000-6-3/-6-1 or vehicle EMC (CISPR 25)
Regional: CE/UKCA, RoHS/REACH
Traceability: QR/UID on pack & e-label in BMS
Reliability: Target field failure rate (e.g., <300 ppm @ 2 yrs)

Budget Reality: Certification test scope can influence BOM and schedule significantly. Share target markets early so we align standards and documentation.

6) BMS & Interfaces

Protections

OVP/UVP, OCD/OCC, OTP/UTP (cell & pack sensors)
Short-circuit detection method & reset strategy
Passive/active balancing, threshold, balance current

Telematics & Data

Comms: CAN 2.0B / CANopen / RS485 / UART
Data: SOC/SOH, cycle count, alarms, lifetime logs
External GUI/API, firmware update (bootloader/OTA)

Interface	Spec	Notes
CAN	250/500 kbps	DBC map, node ID, termination
RS485	9600–115200 bps	Modbus map
GPIO	Ignition / Wake / Interlock	Levels & timing

7) Verification Plan & Pilot Run

Phase	Purpose	Deliverables
EVT	Validate topology & safety	Schematics, thermal/IR data, basic DVT tests
DVT	Validate performance & reliability	Full test plan pass, cycle/DoD matrix, comms compliance
Pilot/PVT	Validate manufacturability	Process FMEA, CTQ limits, golden sample, PPAP (if needed)

Data we provide: UN38.3 test summary, MSDS, traceability records, OCV/IR screening, burn-in (if specified), and a pack-level test report aligned to your duty cycle.

8) Requirement Checklist & Email Template

8.1 One-Page Checklist

Voltage range, capacity (Wh/Ah)
Continuous/peak current & duration
Charge method & limits
Duty profile/load curve attached
Chemistry preference (NMC/LFP/other)
Size/weight limits & mounting
Connectors/pinout
Thermal limits & cooling
Environment (IP, humidity, altitude)
Compliance standards
BMS protections & comms
Volume, price band, lead time

8.2 RFQ Email Template

Subject: RFQ – Custom Lithium Battery Pack (Project: )
Hello Huawen New Power Team,
We’d like a quotation and feasibility review for a custom pack:
• Voltage/Range: 
• Capacity: 
• Load Profile: 
• Discharge Current: 
• Charge Profile: 
• Size & Mass Limits: 
• Environment: 
• Compliance: 
• BMS/Comms: 
• Volume/Timeline: 
• Budget/Warranty: 
Attachments: Load curve, mechanical drawing, interface map.
Best regards,

Vague peaks: “High current occasionally” → quantify peak amps, duration, repetition.
Missing charge limits: State CC/CV, end-of-charge current, and charger tolerance.
Thermal blind spots: No ambient/cooling data → assume worst-case and derate.
Compliance late: Declaring standards after DVT → redesign risk. Align at RFQ.
Connector surprises: Unavailable mating parts → specify P/N and pinout early.

Do not over-specify unreal constraints. If trade-offs are allowed (e.g., ±5% mass for +10% runtime), say so. It widens feasible, cost-effective designs.

Send us your one-page checklist and load curve, and our engineers will propose chemistry, topology (S/P), BMS strategy, and a verification plan tailored to your market standards.

Contact: sales@huawennewpower.com Website: www.huawennewpower.com