Method for replacing diaphragm of single polar plate group of storage battery

Abstract

The invention discloses a method for replacing a diaphragm of a single polar plate group of a storage battery, which comprises the following steps of S1, dismantling a shell of the storage battery to expose an internal polar plate group with liquid, S2, inversely arranging the polar plate group with liquid on a supporting platform, hollowing out and avoiding the lead terminals of the positive electrode and the negative electrode, and placing an electrolyte collecting device below the polar plate group with liquid, S3, manufacturing an insulating material isolation piece with the length and the width slightly larger than those of the pole piece, S4, inserting isolation pieces into the two sides of the pole piece wrapped with the diaphragm for completely isolating the pole piece from the other pole pieces, S5, manufacturing a new diaphragm according to the actual expansion degree of the pole pieces in the pole plate group, wherein the new diaphragm is semi-closed and used for wrapping the expanded pole pieces, S6, after the separation of the pole pieces is completed, taking out the to-be-replaced diaphragm wrapping the separated pole pieces, sleeving the new diaphragm on the pole piece along the original position, pulling the new diaphragm to the required position from the two sides, and taking out the isolation piece, and repeating the operation until all diaphragms in the whole polar plate group are replaced.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing, in particular to a diaphragm replacement method for battery cell pole plate groups. Background technique [0002] As the core component of the battery system, the battery cell has been widely used in various fields of the national economy; the battery cell is mainly composed of positive electrodes, negative electrodes, diaphragms, electrolytes, and casings. The effectiveness of each part will affect The normal use of battery cells will affect the normal use of the battery system; therefore, maintenance will be carried out at different stages during the entire service life of the battery system. During maintenance, some outdated single batteries or different targeted products according to the life span Carry out step-by-step utilization disposal. [0003] Large-capacity battery cells can meet the performance requirements by repairing or replacing a certain component of the failed or...

AI Technical Summary

Problems solved by technology

[0003] Large-capacity battery cells can meet the performance requirements by repairing or replacing a certain component of the failed or low-performance cells, so as to achieve full utilization of resources; as the core component inside the battery cell, the diaphragm is The progress of the application mode has gradually become a prominent influencing factor in the failure mode, and its cost and cycle life are lower than that of the positive and negative electrodes. Therefore, the replacement of the battery cell diaphragm has become a main disposal method in the maintenance process; the existing disposal methods are usually Disassemble the plate group and reassemble it with a new diaphragm according to the assembly method; for the plate group that adopts welding method, its assembly is compact, the cost of replacing the diaphragm is higher and the steps are cumbersome, and the cascade utilization cost is high; due to the maintenance of battery cells In the process of replacing the diaphragm of the plate group, it is also necessary to consider that the positive and negative electrodes cannot be directly short-circuited, and the residual electrolyte will also seriously affect the removal and insertion of the diaphragm.

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