What kind of tests should a new lithium battery for EV need to be performed before launching into market?

As more EVs are emerging into market, a comprehensive set of tests must be conducted to ensure the lithium battery safety, reliability, performance, and compliance with industry standards. These tests are critical to validate the battery's design, manufacturing quality, and suitability for automotive applications. 

Below is an overview of the key types of tests that should be performed, based on industry practices and standards:
1. Performance Testing including Capacity Testing, Power Output Testing, Energy Efficiency Testing, Charge/Discharge Rate Testing and Range Testing.

2.Safety Testing including Thermal Runaway Testing, Crash Testing, Overcharge/Overdischarge Protection Testing, Short-Circuit Testing and Fire Resistance Testing. 

3. Environmental Testing like Temperature Performance Testing, Humidity and Corrosion Testing, 
Thermal Shock Testing and Vibration and Shock Testing.

4. Durability and Lifetime Testing like Cycle Life Testing, Calendar Life Testing and State of Health (SOH) Monitoring.

5.Manufacturing and Quality Control Testing includes Cell-to-Cell Variation Testing, End-of-Line Testing and Quality Assurance Testing.

6. Regulatory and Compliance Testing like Safety Standards Compliance to Ensures adherence to plus international standards like UN R100 (for EV batteries), IEC, SAE, or UL, which mandate tests for thermal propagation, electrical insulation, and resistance to external hazards.
Plus Environmental Regulation Testing: Verifies compliance with regulations on material use, recyclability, and environmental impact, particularly for lithium mining and recycling processes.
And Electromagnetic Compatibility (EMC) Testing: Ensures the battery and BMS do not interfere with other vehicle electronics or external devices.

7.Advanced Diagnostic Testing includes Electrochemical Impedance Spectroscopy (EIS), Static Capacity Analysis and Thermal Monitoring.

8.Real-World and Road Testing includes Vehicle Integration Testing, Road Testing and Consumer Simulation Testing.

Additional Considerations should cover Battery Management System (BMS) Validation, Specific Chemistry Testing, Recyclability and Environmental Impact.

Industry Examples are Mercedes-Benz and Factorial Energy: Conducted laboratory and road tests for solid-state batteries in a modified EQS, focusing on energy density (450 Wh/kg), safety, and a 25% range increase.

BMW and Solid Power: Tested all-solid-state batteries in an i7, emphasizing higher energy density and lower costs, with road tests to validate real-world performance.

LiFePO4 Batteries: Automakers like Tesla and BYD test for safety (e.g., thermal runaway resistance up to 270°C) and cold-weather performance, showing 20-30% capacity retention at -20°C.

Conclusion

A new lithium battery for EVs must undergo rigorous performance, safety, environmental, durability, manufacturing, compliance, and real-world testing to ensure it meets automotive standards. These tests validate the battery's ability to deliver reliable range, withstand extreme conditions, ensure passenger safety, and comply with regulations. For novel chemistries, additional tailored tests are necessary to address unique properties. Manufacturers often collaborate with testing organizations (e.g., IEC, SAE, UL) and conduct both lab and road tests to refine the design before market launch.