Safiery Solid State Lithium Battery
Field Testing
Solid State Lithium 12V Battery 80% SOC has Nail Fired Into Battery March 3, 2025.
1. Mechanical Abuse Solid State Lithium idividual wafer Cells are certified to withstand penetration by a nail. However, there are no publicised results of mecahnical abuse of an entire battery. In the event these batteries are installed under a chassis in a vehicle, there is the possibility of direct puncture of the basttery case and into the battery short circuiting multiple wafer cells. Decision was taken to fire a nail into a 12V Solid State Lithium Battery at high velocity with a percussion nail gun. This was done with battery upside down into the bottom 6 wafer cells through the metal case. 2. Electrical Abuse The Solid State Lithium battery was pre-charged to 80% SOC.
The Nail penetration was accross the botton two arrays of 8 wafer cells totally 6.3V and 1,394 Wh of contained energy. There would be a direct short circuit and release of that energy upon impact. 3. Immediate Results No explosion. No Fire. Small amount or gas. Temperature rise of short circuited cells reached 107C then reduced to to 45C in 1 hour. ABS case was deformed in bottom half. 4. Following Day Results
The voltmeter shows the top two layers perfectly intact recording 6.3V. The CAN BMS was still reponding when we increased the voltage to 12V on terminals. There was NO persistent dead short accross the terminals. 5. Conclusion Wafer cells have a certified temperature threashold of 130C. Although the temperature went to 107C, the non penetrated wafer cells remained perfectly in tect and operating. No explosion nor fire in the open area with plenty of oxygen arround gives the highest safety peace of mind.
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