What is the impact of the pressure on the lithium-ion battery module?

Soft package lithium-ion battery module generally adopts the stacking method to form the module. In the module, a certain force is applied to the stacking battery to tighten it. Its role is mainly to constrain the battery.

If the pressure is too small, the battery is easily damaged when it vibrates with the body; Too much will have a negative impact on the battery's life. Therefore, the structural design of the soft package lithium-ion battery module must consider putting a suitable pressure on the battery.

Small stack pressure can prevent layer and layer off, which is beneficial to the long-term life of the battery. However, due to the loss of cyclic lithium ions, greater pressure leads to greater capacity attenuation. In addition, stacking pressure also leads to local deformation of the diaphragm and chemical degradation. When the battery capacity changes from 0 to 100 %, the thickness of the lithium battery will increase by about 1.2 %. From the results of these studies, the external pressure of the lithium battery has a significant impact on the performance of the battery. It must be considered when designing the structure of the lithium battery module.

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