Power lithium ion battery

Abstract

The invention discloses a power lithium ion battery. The power lithium ion battery comprises a shell, a roll core group, a positive electrode cover plate and a negative electrode cover plate, wherein the roll core group comprises a fixed support and a plurality of roll cores, the fixed support is provided with a plurality of placing grooves, the roll cores are placed in the placing grooves, the roll cores are in one-to-one correspondence with the placing grooves, positive electrode tabs of the plurality of roll cores are connected in series, and negative electrode tabs of the plurality of roll cores are connected in series; the positive electrode cover plate and the negative electrode cover plate are respectively fixed on two opposite sides of the roll core group and are used for wrapping the two opposite sides of the roll core group; the shell is arranged on the outer side of the roll core set and used for wrapping the roll core set. According to the battery disclosed by the invention, an A/B roll core pairing process is cancelled, so that waste caused by the problems of wrong roll core pairing, mismatched quantity and the like is avoided, and the product quality is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a power lithium ion battery. Background technique [0002] At present, lithium-ion winding cores are mostly produced by winding and forming, and then A / B winding cores are paired to form batteries for production. Not only need to configure A / B winding machines separately, but also need matching machines for winding core configuration. , and A / B winding cores are prone to problems such as pairing confusion and quantity mismatch, which greatly hinder the improvement of production efficiency and pass rate, and verification affects production quality. [0003] Secondly, when multiple batteries form a module, the greater the number of individual batteries, the more difficult it is to control the consistency of the voltage and capacity of the module as a whole, and it is easy to have a "barrel effect" that seriously affects the entire battery module. Contents of the inventi...

AI Technical Summary

Problems solved by technology

[0002] At present, lithium-ion winding cores are mostly produced by winding and forming, and then A / B winding cores are paired to form batteries for production. Not only need to configure A / B winding machines separately, but also need matching machines for winding core configuration. , and A / B winding cores are prone to pairing confusion, quantity mismatch and other problems, which greatly hinder the improvement of production efficiency and pass rate, and verification affects production quality

[0003] Secondly, when multiple batteries form a module, the greater the number of individual batteries, the more difficult it is to control the consistency of the voltage and capacity of the module as a whole, and it is easy to have a "barrel effect", which seriously affects the entire battery module.

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