Battery cell

Abstract

The invention discloses a battery cell. The battery cell comprises a first pole plate, a second pole plate, a diaphragm and a first fixed piece, wherein the diaphragm comprises a first end part, a second end part and a third end part, the first end part, the second end part and the third end part exceed the first pole plate, the second end part is arranged between the first end part and the secondend part, and the first fixed piece is used for fixing the first end part, the second end part and the third end part. By matching of the first pole plate, the second pole plate, the diaphragm and the first fixed piece, the diaphragm can be prevented from contracting and being wrinkled when the battery cell drops, the first pole plate and the second pole plate can be enabled to be effectively separated by the diaphragm, so that the risk such as short circuit and voltage drop caused by diaphragm contraction when the battery cell drops can be effectively prevented, the application safety of thebattery cell can be further improved, and the lifetime of the battery cell can be prolonged; and moreover, the battery cell is simple in structure and process, production and manufacturing can be more convenient, so that the manufacturing cost can be reduced.

Description

technical field [0001] The invention relates to the field of electrochemical technology, in particular to an electric core. Background technique [0002] In order to meet the requirements of high energy density and long service life of lithium-ion batteries for electronic mobile devices, the separator in the battery structure is getting thinner and the electrolyte is getting more and more; during the use of the battery, there may be drops and vibrations, etc. Mechanical abuse, the two sides of the soft separator will be subjected to the friction of the positive electrode and the negative electrode and the impact of the electrolyte, which will cause the separator to shrink and wrinkle and cannot effectively isolate the positive and negative electrodes. This will lead to internal short circuit of the battery and cause safety hazards of heating and fire. Therefore, effectively restraining the end of the separator is an effective strategy to improve the drop performance of lithi...

AI Technical Summary

Problems solved by technology

[0002] In order to meet the requirements of high energy density and long service life of lithium-ion batteries for electronic mobile devices, the separator in the battery structure is getting thinner and the electrolyte is getting more and more; during the use of the battery, there may be drops and vibrations, etc. Mechanical abuse, the two sides of the soft separator will be subjected to the friction of the positive electrode and the negative electrode and the impact of the electrolyte, which will cause the separator to shrink and wrinkle and cannot effectively isolate the positive and negative electrodes. It will lead to internal short circuit of the battery and cause safety hazards of heating and fire. Therefore, effectively restraining the end of the separator is an effective strategy to improve the drop performance of lithium batteries.

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