Method and battery pole piece for reducing battery self-discharge and improving safety performance

Abstract

The invention discloses a method for reducing battery self-discharge and improving safety performance. The method comprises the following steps of: (1) shearing a battery pole piece coated with polar powder during the process of producing the battery pole piece; and (2) carrying out protection processing operation on the left side edge and right side edge of the sheared battery pole piece so as to form smooth outer surfaces at the two sides of the battery pole piece. Moreover, the invention further discloses a battery pole piece for reducing the battery self-discharge and improving the safety performance. According to the method and battery pole piece for reducing the battery self-discharge and improving the safety performance, the edge protection treatment can be conveniently and quickly carried out on the battery pole piece after a shearing process, loose polar powder at the edges of the battery pole piece is prevented from falling in a subsequent manufacturing process, so that the battery self-discharge problem caused by falling polar powder is avoided; and the polar powder is prevented from piercing a battery diaphragm, so that the safety performance of a battery is guaranteed, the improvement on the overall production quality of the battery is favored, and the method and the battery pole piece have significant production practical significance.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a method for reducing battery self-discharge and improving safety performance and battery pole pieces, which can overcome the shedding and burrs of electrode powder on the edges of battery pole pieces after shearing during the production process. The impact on the self-discharge and safety performance of the battery. Background technique [0002] Compared with other types of batteries such as lead-acid and nickel-cadmium, lithium-ion batteries have the advantages of large specific capacity, high operating voltage, fast charging speed, wide operating temperature range, long cycle life, small size, and light weight. At present, it has been widely used in mobile phones, notebook computers, electric tools and other fields, and its application range is becoming wider and wider, which is the main direction of development of major battery manufacturers. [0003] At present, lithium-i...

AI Technical Summary

Problems solved by technology

[0006] During the manufacturing process of lithium-ion battery pole pieces, there is a cutting process for the battery pole pieces. During cutting, the electrode powder coated on the edge of the battery pole pieces will become loose due to the action of the cutter. In view of the fact that the battery pole pieces are still To continue the subsequent winding and assembly processes, during these subsequent processes, the electrode powder at the edge of the battery pole piece is easy to fall off and become dust. For example, the negative electrode powder may enter the surface of the positive electrode piece, and the positive electrode powder may enter the surface of the negative electrode piece. Therefore, It will cause the self-discharge problem of the battery, and at the same time, the falling off electrode powder may also have the risk of piercing the battery diaphragm, thereby causing a short circuit of the battery and affecting the safety performance of the battery; The risk of piercing the battery separator, causing a short circuit in the battery and affecting the safety performance of the battery

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