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 bottom shell; the metal cover covers the top of the square metal bottom shell, the metal cover serves as a first conductive electrode, and the square metal bottom shell serves as a second conductive electrode; the metal cover and the square metal bottom shell are connected in an insulating and sealing manner through the insulating assembly; the electrode plate assembly is arranged in the square metal bottom shell, the electrode plate assembly comprises a plurality of electrode plates which are parallel to the metal cover and are arranged in a laminated mode, and the side, facing the metal cover, of the electrode plate, closest to the metal cover, of the electrode plate assembly makes contact with the metal cover for electric conduction; one side, facing the bottom surface of the square metal bottom shell, of a layer of electrode plate, closest to the bottom surface of the square metal bottom shell, of the electrode plate assembly is in contact with the bottom surface of the square metal bottom shell for electric conduction, and the polarities of the two electrode plates which are in contact with the metal cover and the square metal bottom shell for electric conduction are opposite. The structure is simplified, the cost is reduced, and the volumetric specific energy of the battery 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, and the existing square shell lithium battery leads out the positive and negative poles of the battery through tabs or poles. And in the process of battery grouping, bolt connection or welding is required to connect the battery with the bus bar, so as to realize the series and parallel connection of single batteries. It can be seen that this kind of battery containing tabs or poles has the following disadvantages: 1)...

AI Technical Summary

Problems solved by technology

It can be seen that this kind of battery containing tabs or poles has the following disadvantages: 1) It is necessary to reserve a space for welding the tabs inside the battery, so the space of the pole pieces is occupied, and the specific energy of the battery itself will be reduced. ; 2) The series-parallel connection of batteries requires bolt connection or welding, and a certain space needs to be reserved, resulting in a decrease in the volume specific energy of the module or battery; 3) The battery lugs or poles are limited by volume, and the conductivity is weak , which affects the power performance of the battery; 4) The auxiliary materials added to the tabs, poles themselves, and the welding process increase the cost; 5) The series and parallel connections of batteries need to be connected by welding or bolts, resulting in increased process complexity

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