* This information was provided by Toppan Inc and may contain additional information outside the scope of this Claim Verification.
Fire propagation suppressing film characteristics Verified per JSA S1011
Performance was assessed per JSA-S1011:2022, Performance evaluation test of fire propagation suppressing film (FSfilm) used in secondary lithium cell systems. Test Method Summary: The test method was performed multiple times without FSfilm and with FSfilm to verify the film characteristics. The client supplied test apparatus consists of using three 18650 cylindrical cells with an energy density of 3600 mAh placed adjacent to each other and inside of an enclosure per the standard. The middle cell was forced into thermal runaway by driving a nail into it and the adjacent cells are measured and observed to determine if they went into thermal runaway. When the test method was run using the FSfilm, the film had an adhesive backing and was applied inside and outside of the enclosure consisting of a typical total weight of 4.6 grams and a total area of 300 cm2. In some cases, three layers of the FSfilm was used to achieve the total desired weight. Test Results without FSfilm Thermal runaway of one or more adjacent cells occurred 2 out of 5 times when no FSfilm was used. The average time for thermal runaway of the first adjacent cell without the FSfilm installed for the two runs was 578 seconds. Test Results with FSfilm No thermal runaway of the adjacent cells occurred 5 out of 5 times with the FSfilm. The average total area of FSfilm consumed (confirmed visually) was 136 cm2 and estimated weight consumed is 2.1g. Note: All tests conducted used the same supplier and model of 18650 cells. Alternate cell suppliers or models may perform differently in this test, and thus the test results are not indicative of all lithium-ion battery types.
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