1. High internal polarization

　　2. The electrode absorbs water and reacts with the electrolyte, causing a gas bubble

　　3. Quality and performance issues of the electrolyte itself

　　4. The amount of liquid injected cannot meet the process requirements

　　5. During the assembly process, the sealing performance of laser welding is poor, resulting in air leakage. When measuring air leakage, it is not necessary to measure it

　　6. Dust, polar dust, can first cause micro short circuits

　　7. The positive and negative electrode plates are thicker than the process range, making it difficult to insert them into the shell

　　8. Liquid injection sealing problem, poor sealing performance of steel balls leading to air bubbles

　　9. The incoming material of the shell has a thick shell wall, and the deformation of the shell affects the thickness

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