Assembling and fastening method and apparatus for lithium ion battery core

Abstract

The invention specifically relates to an assembling and fastening method and apparatus for a lithium ion battery core, which belongs to the technical field of lithium ion batteries. The method comprises the following steps: placing a laminated or wound core in a bag or sleeve like fastener made of a pyrocondensation material; and heating the fastener, wherein the fastener contracts and then wraps and fits the exterior of the laminated or wound core to firmly fasten the laminated or wound core. With the method and apparatus provided by the invention, laminated or wound cores can be guaranteed to be firmly fastened, neat and consistent, the risk of short circuit of a battery caused by mismatch among a positive pole plate, a negative pole plate and a diaphragm since the laminated or wound cores are too loose can be prevented, and the fastener fastened at the exterior of the laminated or wound core exerts a protection effect on the whole surface of the laminated or wound core and can prevent the laminated or wound core from damage during transhipment or shell entering.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method and device for assembling and fastening lithium-ion battery cells. Background technique [0002] With the development of lithium-ion battery technology becoming more and more mature, lithium-ion batteries are widely used in electric vehicles, UPS, energy storage power stations and other industries. However, the control of the production process of lithium-ion batteries is a key factor restricting its development. After the lithium-ion battery cell is laminated or wound, it is easy to cause misalignment between the positive and negative electrodes and the separator when the cell is transferred and put into the case, and it is easy to damage the surface of the cell, which may eventually lead to a short circuit inside the battery lead to safety incidents. [0003] At present, in the production of lithium-ion battery cells, most of the fastening methods of th...

AI Technical Summary

Problems solved by technology

The technical problems of this process are: firstly, due to the narrow width of the tape or wrapping tape and the limited pre-tightening force, the battery cells cannot be effectively fastened, and the displacement of the positive and negative electrodes and diaphragms cannot be effectively avoided, and the battery cells are stressed too much. Concentration can easily cause damage to the pole piece; in addition, the process is low in automation, time-consuming and laborious, and it is difficult to control the winding force and easily damage the battery cell

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