Square-shell battery cell and battery module

Abstract

The invention discloses a square-shell battery cell and a battery module, and the square-shell battery cell comprises a square metal shell which is provided with a top cover and a lower shell, the top cover is used as a first conductive electrode, and the lower shell is used as a second conductive electrode; the top cover and the lower shell are in insulation connection through the insulation assembly; the electrode plate assembly is arranged in the square metal shell, the electrode plate assembly is formed by sequentially laminating and winding a first electrode plate, a first diaphragm, a second electrode plate and a second diaphragm, the polarities of the first electrode plate and the second electrode plate are opposite, one of the first electrode plate and the second electrode plate is in contact with the first conductive electrode, and the other one is in contact with the second conductive electrode; and the other one of the first electrode plate and the second electrode plate is in contact with the second conductive electrode. According to the square-shell battery cell, the wire outlet end of a certain electrode plate is omitted, parts such as tabs do not need to be arranged, the structure is simplified, the volumetric specific energy is improved, the cost is reduced, and the volumetric grouping efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a square shell battery cell. The invention also relates to a battery module comprising the square-shell electric core. Background technique [0002] With the increasingly severe energy and environmental problems, countries all over the world have stepped up research and development of new energy vehicles. As an important part of electric vehicles, power batteries are imperative to study. [0003] The square shell lithium battery is a kind of power battery. The positive and negative electrodes of the existing square shell lithium battery need to be welded with the pole piece inside the shell, and need to be welded or screwed to the bus bar outside the shell, resulting in a square shell lithium battery. After being grouped, the volume specific energy will be greatly attenuated, and the reliability will be reduced. When connecting in series and parallel, a series of compo...

AI Technical Summary

Problems solved by technology

[0003] The square shell lithium battery is a kind of power battery. The positive and negative electrodes of the existing square shell lithium battery need to be welded with the pole piece inside the shell, and need to be welded or screwed to the bus bar outside the shell, resulting in a square shell lithium battery. After grouping, the volume specific energy will have a large attenuation and the reliability will decrease

When connecting in series and parallel, a series of components such as busbars and carriers are required, which not only increases the types of module auxiliary materials, increases the cost, but also increases the complexity of the process, further reducing the efficiency of volume grouping

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