Battery current collector and battery assembly method

Abstract

The invention discloses a battery current collector and a battery assembly method, comprising a sealing ring, a negative electrode bottom cover and a conductive nail, the conductive nail passes through the central hole of the sealing ring and is welded to the negative electrode bottom cover, the negative electrode bottom cover is embedded in the sealing ring, sealed The ring includes a first outer peripheral part and a main plane. The main plane is provided with a weak part. The first outer peripheral part of the sealing ring is bell-shaped. The root diameter of the first outer peripheral part is smaller than the diameter of the opening of the first outer peripheral part. Its advantages In the process of inserting the current collector into the opening of the steel shell, only the sealing ring and the upper edge of the outer peripheral part of the negative electrode bottom cover are subjected to radial force, which has little influence on the bottom cover plane of the negative electrode bottom cover and the main plane of the sealing ring. The central weak spot of the ring will not be damaged.

Description

technical field [0001] The invention relates to a battery sealing and explosion-proof structure, in particular to a battery current collector and a battery assembly method. Background technique [0002] The current collector is an important structure in the battery, and its functions mainly include three aspects: one is to collect and transmit the current generated by the negative part of the battery inside; the other is to seal, that is, to close the opening at the bottom of the battery case; the third is to prevent explosions , to prevent the battery from exploding due to excessive internal gas pressure. [0003] The Chinese authorized invention patent with the announcement date of June 9, 2010 and the patent number of 200710166429.8 discloses a "battery current collector". In its background technology, the traditional collector structure is introduced. At least one weak point is provided, the weak point is an annular explosion-proof ditch surrounding the central hole of ...

AI Technical Summary

Problems solved by technology

[0008] The outer periphery of the negative electrode bottom cover and the outer periphery of the sealing ring of the traditional collector that has not been assembled into a battery are perpendicular to the main plane of the negative electrode bottom cover. In the process of assembling the current collector of this structure into the steel shell mouth , if the design of the outer diameter of the current collector is too small, the compression amount of the mouth of the steel shell cannot be guaranteed, and the current collector is easy to pop out from the mouth of the steel shell, and the assembly process cannot be completed smoothly

If the outer diameter of the current collector is too large, the friction and extrusion force will increase when the current collector is inserted into the mouth of the steel shell, and equipment with a large insertion force is required; the biggest problem is to squeeze the current collector into the steel shell. During the process of the shell mouth, the outer peripheral part of the sealing ring, the outer peripheral part of the negative electrode bottom cover and the main plane of the sealing ring are radially compressed, so that the main plane of the negative electrode bottom cover and the main plane of the sealing ring are arched and deformed, and they are bent later During the crimping and sealing process, the excessively large current collector, the radial compression amount is large, the main plane of the sealing ring is seriously arched and deformed, the central weak part (explosion-proof ditch) of the sealing ring is deformed, and even the central weak part is damaged

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