Battery cell and battery

Abstract

The invention provides a battery cell. The battery cell comprises a lower cover plate and a fixed plate erected on the lower cover plate, wherein a diaphragm, a negative pole piece and a positive polepiece are wound on the fixed plate. The invention also provides a battery. The battery comprises the battery cell, a battery shell with openings at two ends and an upper cover plate, wherein the battery cell penetrates into the battery shell from the bottom of the battery shell, the lower cover plate seals the bottom opening of the battery shell, and the upper cover plate seals the top opening ofthe battery shell, so the battery cell and the battery shell are fixedly connected through the lower cover plate and cannot shake. In the charging and discharging process of the battery, heat generated by the battery pole pieces can be transferred to the lower cover plate through the fixed plate and then transferred to the battery shell and the exterior of the battery shell, so the problem of difficulty in heat dissipation is effectively solved.

Description

technical field [0001] The present application relates to the field of battery manufacturing, in particular to a battery cell and a battery. Background technique [0002] In the battery manufacturing process, especially in the lithium battery manufacturing process, the manufacture of batteries is very important. In the prior art, the manufacture of electric cores mostly adopts the winding method. During the manufacturing of the battery cell, due to the uneven internal structure of the battery cell, such as welding tabs on the pole piece, closing the diaphragm, etc., it is difficult to control the thickness of the battery cell. Leave a certain margin in between, because the battery cell and the cover plate are flexibly connected, so the battery cell is easy to shake in the casing, causing a safety hazard. In addition, due to the structure of the battery cell, there is only one-way heat transfer between the pole piece and the diaphragm, which leads to a serious temperature g...

AI Technical Summary

Problems solved by technology

During the manufacturing of the battery cell, due to the uneven internal structure of the battery cell, such as welding tabs on the pole piece, closing the diaphragm, etc., it is difficult to control the thickness of the battery cell. Leave a certain margin, because the battery cell and the cover are connected flexibly, so the battery cell is easy to shake in the shell, causing a safety hazard

In addition, due to the structure of the battery cell, there is only one-way heat transfer between the pole piece and the diaphragm, which leads to a serious temperature gradient distribution phenomenon, and the phenomenon of internal high temperature and external low temperature appears.

The uneven temperature distribution leads to the deactivation of the active material at the high temperature position first during the charging and discharging process of the battery, which cannot perform the function of deintercalating lithium ions, which in turn affects the rapid attenuation of other positions and affects the performance of the battery

[0003] In order to solve the above problems such as the shaking of the battery inside the shell and the difficulty of heat dissipation inside the battery, a new battery and battery are needed.

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