A kind of chemical synthesis method to solve the abnormality of soft-pack lithium-ion power battery

Abstract

The invention discloses a formation method for solving the abnormality of a soft-pack lithium-ion power battery, which comprises the following steps: (1) performing the first formation on the battery cell; (2) performing the first formation on the battery cell after the first formation Make a notch at the pre-sealed edge of the cell, then extract the gas in the cell, and then package it; (3) Finally, perform a second formation on the cell. The invention is easy to operate, low in cost, does not need to add high-cost equipment, is easy to use when abnormality occurs, and can finally make abnormal batches of batteries have the same effect as normal batteries.

Description

technical field [0001] The invention relates to the field of soft-pack lithium-ion power batteries, in particular to a chemical synthesis method for solving the abnormality of soft-pack lithium-ion power batteries. Background technique [0002] Flexible packaging lithium-ion battery refers to the cell whose outer packaging is encapsulated by aluminum-plastic film. [0003] With the continuous development and wide application of flexible packaging lithium-ion batteries, people put forward higher requirements for the performance of flexible packaging batteries, and the starting point of all performance is often determined by the quality of the chemical interface, which prompts the staff to pay more attention to the chemical interface. state; [0004] The outermost aluminum-plastic film of the soft-packed lithium-ion battery is sealed by the inner layer of PP hot-melt to ensure the sealing. Air bubbles or openings are generated, which seriously reduces the sealing performance...

AI Technical Summary

Problems solved by technology

[0006] see figure 1 , the first type of abnormality is: poor formation interface, lithium A on the interface, this type of abnormality is mainly caused by the uneven appearance of the battery pack, because it has been packaged, dismantling the package will cause irreversible damage to the battery cell, When this type of cell is formed, due to the gap between the fixture and the cell, along with the influence of gas formation, the positive and negative electrodes cannot be in close contact with each other, resulting in the formation of lithium and affecting the use and safety of the battery;

[0007] see figure 2 , the second type of abnormality is: final seal abnormality, bubbles, opening B, the reasons for this type of abnormality may be various, such as the air bag space is relatively small, poor moisture control, material fluctuations, side reactions, etc. lead to the final seal Edge abnormality, air bubbles affect the safety of use, and openings directly cause battery cells to be scrapped

[0008] At present, it is inevitable to encounter the above two abnormalities in the mass production process. Usually, in order to ensure the performance and safety of the product, it will be scrapped as a last resort.

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