How to design batteries to reduce bloating in high-temperature environments?

　　In order to reduce the swelling problem of soft pack lithium batteries in high-temperature environments, improvements can be made in battery design, material selection, thermal management, and other aspects:

　　1. Electrolyte optimization: Choosing appropriate electrolyte additives, such as VC (vinyl carbonate), can significantly improve the swelling problem of soft pack lithium batteries at high temperatures. VC helps to form a more stable SEI film and reduce gas generation. Experiments have shown that adding 3% VC to the electrolyte is the optimal ratio

　　2. Process optimization: In the process flow after liquid injection, increasing the settling temperature can accelerate the side reaction of catalytic gas producing substances, reduce gas production during high temperature shock in the later stage, and thus suppress gas expansion. For example, allowing the battery to stand at 85 ℃ for 8 hours after injection can improve its resistance to high temperature swelling.

　　3. Thermal management design: An effective thermal management system is crucial for controlling battery temperature. Active liquid cooling or heating systems can be used to slow down the performance degradation of the battery pack. In addition, the thermal management system (BTMS) of the battery can control the temperature changes during the charging and discharging process to adapt to different environmental temperatures.

　　4. Battery structure design: The physical structure and material selection of the battery have a significant impact on thermal conductivity. For example, the thermal anisotropy of soft pack batteries is prominent, and this characteristic should be considered in design. It may be necessary to combine heat pipes and graphene materials to design a heat dissipation structure to quickly and safely dissipate heat.

　　5. Electrode material selection: Choosing electrode materials with high thermal stability, such as polyanionic positive electrode materials (lithium iron phosphate), as well as surface coated or doped modified layered positive electrode materials, can improve the electrochemical and thermal stability of the battery at high temperatures.

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