1. Report and sample of electrode with ECE demonstrate electric conductivity ≥0.25 s/cm 2. Report and sample of SSL coated separator membrane demonstrate Gurley value ≤300 s/100cc or variation ≤40% 3. Report and sample of battery cells w/ ECE & SSL to demonstrate: -- Internal resistance deviation ≤20%, capacity performance deviation ≤5% relative to control sample -- Current drop by self-shutdown at 90-120°C 4. Report and sample of battery module with battery cells comprising the SSL & ECE for prototype LEV battery modules of 10-24V to demonstrate: -- Process recipes, field application and reliability test results, by involving a prototype LEV to show module temperature rise <50 oC after discharge at 2C, and module demonstrate direct current internal resistance increase >50% at 90-120oC. 5. Contract Service Deliverables with Customer 1 - Optimized solution and technical report for improving the cycle performance of Sn-based anode material 6. Contract Service Deliverables with Customer 2 - Material evaluation report on self-shutdown layer thermal driven particle emulsion and performance evaluation report on self-shutdown coated separator membrane1. Report and sample of electrode with ECE demonstrate electric conductivity ≥0.25 s/cm 2. Report and sample of SSL coated separator membrane demonstrate Gurley value ≤300 s/100cc or variation ≤40% 3. Report and sample of battery cells w/ ECE & SSL to demonstrate: -- Internal resistance deviation ≤20%, capacity performance deviation ≤5% relative to control sample -- Current drop by self-shutdown at 90-120°C 4. Report and sample of battery module with battery cells comprising the SSL & ECE for prototype LEV battery modules of 10-24V to demonstrate: -- Process recipes, field application and reliability test results, by involving a prototype LEV to show module temperature rise <50 oC after discharge at 2C, and module demonstrate direct current internal resistance increase >50% at 90-120oC. 5. Contract Service Deliverables with Customer 1 - Optimized solution and technical report for improving the cycle performance of Sn-based anode material 6. Contract Service Deliverables with Customer 2 - Material evaluation report on self-shutdown layer thermal driven particle emulsion and performance evaluation report on self-shutdown coated separator membrane
Hong Kong Newpo Science & Technology Co., Limited
Zhongke Laifang Energy Technology (HK) Limited
A robust battery module (RBM) with enhanced safety is gaining increasing interest attributed to the risk of firing and explosion incur by LIB cell temperature rise. Battery module in LEV, such as EV starter, UAV, e-scooter, etc, is consistently operate under a high current pulse and/or high continuous discharge rates that could cause rise in cell internal temperature and likely to generate local breakdown area. At adverse condition such as over charge, external short-circuit, crush impact, etc it could become the weak spot that causes fast heating and reach temperature that may lead to dangerous thermal run away in battery cell and subsequently propagate in module. Such thermal event has incurred many serious firing incidents. In this project, smart thermal management function in RBM is designed with electric conductive enhancer (ECE) and self shutdown layer (SSL) in the respective cells to provide additional and direct safeguard. The special bi-functional affinity macro-molecule technique is developed to enable sufficient loading and uniform dispersant of ECE in the electrode active layer which internal heating would be reduced with lower ohmic resistance. In addition, a temperature sensitive SSL is built on separator to enhance internal shutdown function to suppress thermal runaway in cell. The SSL comprising of special designed co-polymer particles that form a porous network on separator and would become soften at the pre-designed temperature of 90-120oC for pore sealing. This would allow interruption of cell reaction and prevent temperature further rise to the adverse temperature that could cause thermal run away. A custom battery module of 10-24V containing an assembly of battery cells with the thermal management design will be developed to demonstrate field application results.