Electrode assembly, battery cell, battery and electric device

By designing the excess part and joint part of the diaphragm in the battery electrode assembly, forming a structure that wraps the electrode sheet, the problems of bare and short circuit caused by the diaphragm folding are solved, and the yield of the battery is improved.

CN119725342APending Publication Date: 2025-03-28CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202311279494.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-28
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

During the winding of the battery, the diaphragm is prone to abnormal situations such as folding, causing the contact short circuit of the adjacent pole sheet, affecting the yield of the battery cell.

Method used

An electrode assembly is designed in which the diaphragms on both sides of the electrode sheet extend beyond the electrode sheet to form an overhead portion and are connected by the joint portion to form a structure that encloses the electrode sheet, thereby reducing the exposed and short circuit of the electrode sheet caused by the diaphragm folding.

Benefits of technology

It effectively reduces cell failure caused by diaphragm folding, improves the yield of the battery, ensures that the pole plate is not easy to come into contact with adjacent pole plates, thereby reducing the risk of short circuit.

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Abstract

The invention is applicable to the technical field of power batteries, and provides an electrode assembly, a battery monomer, a battery and a power utilization device, the electrode assembly comprises: a pole piece, which comprises a pole piece body and a tab area; the diaphragms are arranged on the two opposite sides of the pole piece in the thickness direction of the pole piece, each diaphragm comprises a covering part covering a pole piece body and an exceeding part connected to the covering part, and the exceeding part covers part of the tab area; the exceeding parts on the two opposite sides of the pole piece are at least partially connected with each other to form a combination part, or the exceeding parts on the two opposite sides of the pole piece are at least partially connected to the tab area to form the combination part; according to the electrode assembly provided by the invention, the diaphragms are arranged on the two sides of the pole piece, and each diaphragm comprises the covering part and the exceeding part, so that the exceeding parts on the two sides of the pole piece are combined to form the combination part, the two diaphragms can wrap the pole piece in the width direction of the pole piece, and the pole piece cannot be exposed to the outside even if the diaphragms are turned over; therefore, the situation that two adjacent pole pieces are in contact due to turnover of the diaphragm is reduced, and the yield of the battery is improved.
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