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Battery cell hot-pressing tool

A battery cell and tooling technology, which is applied in the direction of circuits, electrical components, secondary batteries, etc., can solve problems affecting the energy density and cycle life of the battery cell, the structural deformation of the positive electrode tab of the battery cell, and the structural deformation of the battery cell, etc.

Pending Publication Date: 2021-05-18
DALIAN CBAK POWER BATTERY CO LTD
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Problems solved by technology

Cylindrical cells are the earliest cell structure in the lithium battery industry. At present, in the manufacturing process of cylindrical steel shell full tab cells, the cells are rolled and flattened after winding, but the cells have no heat after flattening. The height between the aluminum tab and the copper tab in the battery with high energy density is generally between 1mm and 6mm, and in the flattening process, the positive tab and the copper tab in the battery may appear. The structural deformation of the tab part of the negative electrode leads to structural deformation of the battery cell during the cycle charge and discharge process, which leads to lithium precipitation during the cycle charge and discharge process of the cell, which in turn affects the energy density and cycle life of the cell

Method used

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Embodiment Construction

[0025] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right" , "vertical", "horizontal", "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawi...

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Abstract

The invention relates to the technical field of batteries, and provides a battery cell hot-pressing tool. The battery cell hot-pressing tool comprises a first hot-pressing piece with a first hot-pressing groove; a second hot-pressing piece which is provided with a second hot-pressing groove and is used for being matched with the first hot-pressing piece, wherein the height of the second hot-pressing piece relative to the first hot-pressing piece is adjustable; a hot-pressing inner core which is used for fixing a battery cell, is mounted on the first hot-pressing piece and is at least partially located in the first hot-pressing groove, or is mounted on the second hot-pressing piece and is at least partially located in the second hot-pressing groove. According to the embodiment of the invention, structural deformation of the battery cell in the cyclic charging and discharging process is avoided, so that lithium precipitation of the battery cell in the cyclic charging process is prevented, the energy density of the battery cell is improved, the cycle life of the battery cell is prolonged, and the structure is simpler.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a hot-press tooling for batteries. Background technique [0002] Lithium batteries have the characteristics of high voltage, high energy density, long cycle life, no memory effect and no pollution. Cylindrical cells are the earliest cell structure in the lithium battery industry. At present, in the manufacturing process of cylindrical steel shell full-tab cells, the cells are rolled and flattened after winding, but the cells have no heat after flattening. The height between the aluminum tab and the copper tab in the battery with high energy density is generally between 1mm and 6mm, and in the flattening process, the positive tab and the copper tab in the battery may appear The structural deformation of the tab part of the negative electrode leads to structural deformation of the battery cell during the cycle charge and discharge process, which leads to lithium precipitation in...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/04
CPCH01M10/0468H01M10/058Y02E60/10Y02P70/50
Inventor 安敏俊薄晋科李盼姚登云宫颂
Owner DALIAN CBAK POWER BATTERY CO LTD
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