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Soft package battery and preparation method thereof

A soft-pack battery and cell technology, which is applied to battery components, circuits, electrical components, etc., can solve problems such as increasing battery production costs, water ingress, and cell failure

Pending Publication Date: 2021-03-23
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a pouch battery and its preparation method, in order to solve the problem that the aluminum-plastic film may cause water ingress during the long-term use of the existing pouch battery, which may cause the cell to fail. The problem that the casing will increase the production cost of the battery

Method used

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  • Soft package battery and preparation method thereof
  • Soft package battery and preparation method thereof
  • Soft package battery and preparation method thereof

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Experimental program
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Embodiment 1

[0049] image 3 Schematic diagram of the structure of the aluminum-plastic film provided in this embodiment; Figure 4 Schematic diagram of part of the structure of the pouch battery provided in this embodiment; Figure 5 for Figure 4 A schematic diagram of the structure of a right end of the aluminum plastic film; Figure 6 for Figure 5 Schematic diagram of the experimental results of the aluminum plastic film structure compared with the existing technology.

[0050] This embodiment provides a pouch battery, including a battery cell 100 and an aluminum-plastic film 200 covering the battery cell 100. Those skilled in the art can understand that the battery cell 100 is a component that stores and releases electric energy in the battery, which includes Positive and negative plates. During the charging process of the battery cell 100, lithium ions are extracted from the positive electrode sheet and embedded in the negative electrode sheet. During the discharge process, lit...

Embodiment 2

[0060] Figure 7 for Figure 4 Schematic diagram of the structure of another right end of the aluminum plastic film; Figure 8 for Figure 7 Schematic diagram of the experimental results of the aluminum plastic film structure compared with the existing technology.

[0061] Such as Figure 7 As shown, on the basis of Embodiment 1, this embodiment provides another pouch battery, specifically, the downwardly bent part of the aluminum layer 220 on the upper right end of the packaging part 240 and the aluminum layer 220 on the lower right end of the packaging part The upwardly bent parts are in contact with each other, that is, the bent section 221 of the aluminum layer 220 above the PP layer 230 of the packaging part 240 is in contact with the bent section 221 of the aluminum layer 220 below the PP layer 230 of the packaging part 240 . It is easy to understand that the right end of the aluminum layer 220 above the package 240 and the right end of the aluminum layer 220 below t...

Embodiment 3

[0070] On the basis of the above-mentioned embodiments, this embodiment provides a method for preparing a pouch battery, so as to form two bent sections 221 at the right end of the packaging part 240, and then use the bent sections 221 to cover the right end surface of the PP layer 230 , improve the waterproof performance of the pouch battery.

[0071] The manufacturing method of the pouch battery provided in this embodiment includes: providing a battery cell and an aluminum-plastic film 200, and punching the aluminum-plastic film 200 to form a pit for accommodating the battery cell. The battery cell is placed inside the pit, and the aluminum plastic film 200 is folded in half for packaging. It is easy to understand that packaging includes a series of processes such as top-side sealing, liquid injection, pre-sealing, and secondary sealing. This embodiment does not limit the specific process of packaging, and those skilled in the art can set it according to actual needs.

[00...

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Abstract

The embodiment of the invention provides a soft package battery and a preparation method thereof. The soft package battery provided by the invention comprises a battery cell and an aluminum-plastic film coating the battery cell, wherein the battery cell is positioned between the two layers of aluminum-plastic films; the edges of the aluminum-plastic film are packaged together, so that the PP layerin the middle is melted to define a packaging part; the aluminum layer on the upper layer of the end, far away from the battery cell, of the packaging part is bent downwards to partially coat the molten PP layer, and the aluminum layer on the lower layer of the end, far away from the battery cell, of the packaging part is bent upwards to partially coat the molten PP layer. The invention also provides a preparation method of the soft package battery. The preparation method comprises the following steps of providing the battery cell and the aluminum-plastic film, performing packaging, and cutting edges. In the edge cutting process, opposite shearing force is used for cutting the packaging part, so that the two aluminum layers at the end, away from the battery cell, of the packaging part arebent inwards to at least partially coat the PP layer of the packaging part. According to the soft package battery provided by the invention, the waterproof performance is improved on the premise of not increasing the production cost.

Description

technical field [0001] Embodiments of the present invention relate to lithium-ion battery technology, and in particular to a pouch battery and a preparation method thereof. Background technique [0002] With the development of science and technology, more and more electronic products have entered all aspects of people's lives, and the normal use of electronic products is inseparable from batteries. Among them, soft pack batteries have the advantages of good safety performance, light weight, and large capacity. , are widely used in electronic products in various fields. [0003] In the prior art, the soft-pack battery includes a battery cell and an aluminum-plastic film casing covering the battery cell. During long-term use, water ingress in the aluminum-plastic film may cause the battery cell inside the aluminum-plastic film to fail. In order to prevent water Passing through the aluminum-plastic film shell leads to the failure of the battery cell. Usually, the waterproof le...

Claims

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Application Information

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IPC IPC(8): H01M50/105H01M50/128H01M50/141
CPCY02E60/10
Inventor 王烽李素丽李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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