a battery

Abstract

The present invention belongs to the field of battery technology, and in particular relates to a battery, which includes a casing and a cell housed in the casing, and also includes an outer wrapping structure with an elastic function, and the outer wrapping structure is arranged outside the casing. A gap is provided between the outer wrapping structure and the casing. When the battery is assembled automatically, the external structure can be deformed by applying a force, and the cell can be tightly assembled, and the size and thickness deviation of the cell can be compensated by the deformation of the above-mentioned external structure; in addition, because the external structure and the shell There is a gap, so that there is enough room for expansion when the cell expands, ensuring that the cycle life of the cell will not be affected. Moreover, because the outsourcing structure is tightly assembled, safety accidents such as damage to the cell shell, short circuit between the cell and the module, and short circuit due to internal vibration of the cell are avoided.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to a battery. Background technique [0002] At present, with the increasing application of batteries in the field of electric vehicles and energy storage, the automatic assembly of batteries and related safety design are becoming more and more important. The usual battery is due to the increase in energy density and the internal negative pressure before the process is sealed. Therefore, the middle thickness of the finished battery cell is less than or equal to the thickness of the shell, coupled with the consistency deviation of the battery shell, the superimposition of the size of the multi-cell module during assembly makes it impossible to position in the module, so that automatic assembly cannot be realized. In addition, the cell Shaking in the module will cause safety accidents such as damage to the shell, short circuit between the battery cell and the module, and internal sho...

AI Technical Summary

Problems solved by technology

[0002] At present, with the increasing application of batteries in the field of electric vehicles and energy storage, the automatic assembly of batteries and related safety design are becoming more and more important. The usual battery is due to the increase in energy density and the internal negative pressure before the process is sealed. Therefore, the middle thickness of the finished battery cell is less than or equal to the thickness of the shell, coupled with the consistency deviation of the battery shell, the superimposition of the size of the multi-cell module during assembly makes it impossible to position in the module, so that automatic assembly cannot be realized. In addition, the cell Shaking in the module will cause safety accidents such as damage to the shell, short circuit between the battery cell and the module, and internal short circuit due to internal vibration of the battery cell. In addition, even if the battery can be tightly assembled, it is also because the cells transfer heat to each other and do not dissipate heat. Due to the accumulation of internal temperature rise, the service life will be shortened, and safety accidents will occur if it is serious. At the same time, due to the expansion force of the internal cell in the cycle, there is no expansion space outside. The increase of the expansion force of the cell will cause the clamp to deform and the welding position to fail. And other safety accidents, in addition, if the expansion force is not released, the cycle life will be seriously attenuated

For example, the relevant patent is to add structural glue between the batteries, but the amount of glue added needs to be controlled according to the thickness of each battery cell, and it is difficult to realize automation. In addition, the glue will resist heat and age, which cannot reduce safety risks. Important Is it the battery core or there is no room for expansion?

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