Apr. 01, 2025
As the core component of energy storage systems, the quality of lithium batteries directly impacts device safety, lifespan, and performance. As an energy storage engineer, I recommend evaluating battery quality based on the following five key dimensions:
1. Cell Performance Parameters
- Capacity: Measured capacity should meet the rated value (e.g., a 100Ah cell should deliver ≥95Ah in actual discharge).
- Energy Density: High energy density (≥180Wh/kg) indicates lighter weight and higher efficiency.
- Cycle Life: High-quality cells should achieve ≥2000 cycles at 80% depth of discharge (refer to China's GB/T 36276 standard).
2. Safety Test Results
Check third-party test reports, focusing on:
- Thermal Runaway: Passes nail penetration and overcharge tests (e.g., UL9540A standard).
- Flame Resistance: Electrolyte and separator should meet V0 flame-retardant rating.
3. BMS Accuracy
The Battery Management System (BMS) should have a State of Charge (SOC) estimation error ≤3% and include multi-level protections (overvoltage, undervoltage, temperature, etc.).
4. Manufacturing Consistency
- Voltage deviation within the same batch should be <20mV; internal resistance deviation <5mΩ.
- Welding should be secure with no weak joints, and the casing must pass IP67 sealing tests.
5. Brand & Certifications
Prioritize cells from reputable brands (e.g., CATL, BYD) with international certifications like IEC62619 and UN38.3.
Engineer's Advice: Request complete test reports from suppliers and conduct a 1C charge-discharge cycle test on samples to observe capacity degradation trends.
Note: For energy storage projects, pay special attention to low-temperature performance (≥80% capacity retention at -20°C) and calendar life (>10 years). For residential storage, LiFePO4 (LFP) batteries are recommended for enhanced safety.
Through the above methods, you can systematically screen out cost-effective lithium batteries and avoid the risks of later operation and maintenance. If you have more questions about lithium batteries, please consult SolarEast.
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