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Lithium battery preventing falling and failure and preparation method of lithium battery

A technology of lithium battery and manufacturing method, which is applied in the direction of electrolyte storage battery manufacturing, secondary battery, battery pack parts, etc. Effect

Active Publication Date: 2019-11-26
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first purpose of the present invention is to solve the problem of lithium battery drop failure, and the present invention provides a lithium battery that prevents drop failure

Method used

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  • Lithium battery preventing falling and failure and preparation method of lithium battery
  • Lithium battery preventing falling and failure and preparation method of lithium battery
  • Lithium battery preventing falling and failure and preparation method of lithium battery

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0030] A lithium battery that prevents drop failure, including a battery membrane case and a cell placed in the battery membrane case, the battery cell includes a cell body 1 and a diaphragm stack 2, and the diaphragm stack 2 and the cell body 1 Integral connection and located at the tail of the cell body 1, the diaphragm stack 2 is a sheet structure formed by fusing several layers of diaphragms 12 extending in the length direction of the cell body 1, the diaphragm stack 2 Close to the cell body 1 and fold along the thickness direction of the cell body 1 .

[0031] Further, the diaphragm stack 2 is integrally connected with the lower surface of the cell body 1 and folded upwards.

[0032] Further, the width of the diaphragm stack 2 is equal to the thickness of the cell body 1 .

[0033] Further, the cell body 1 is a wound type cell.

specific Embodiment approach 2

[0035] The method for making a lithium battery that prevents drop failure described in the specific embodiment 1 includes the following steps:

[0036] Step 1: Align and wind the positive electrode sheet 11, separator 12 and negative electrode sheet 13 to form a wound cell body 1, the width of the separator 12 is greater than the width of the positive electrode sheet 11 and the width of the negative electrode sheet 13, and the separator 12 is The part wider than the positive electrode sheet 11 and the negative electrode sheet 13 in width extends from the tail of the cell body 1 to form a separator fusion zone 3;

[0037] Step 2: The diaphragm in the diaphragm fusion region 3 is compacted along the thickness direction of the cell body 1 and fused together to form a diaphragm stack 2;

[0038] Step 3: Put the diaphragm stack 2 close to the cell body 1 and fold it along the thickness direction of the cell body 1, and then put it into the battery membrane case to form a lithium ba...

specific Embodiment approach 3

[0042] A lithium battery that prevents drop failure, including a battery membrane case and a cell placed in the battery membrane case, the battery cell includes a cell body 1 and a diaphragm stack 2, and the diaphragm stack 2 and the cell body 1 Integral connection and located at the tail of the cell body 1, the diaphragm stack 2 is a sheet structure formed by fusing several layers of diaphragms 12 extending in the length direction of the cell body 1, the diaphragm stack 2 Close to the cell body 1 and fold along the thickness direction of the cell body 1 .

[0043] Further, the diaphragm stack 2 is integrally connected with the lower surface of the cell body 1 and folded upwards.

[0044] Further, the width of the diaphragm stack 2 is equal to the thickness of the cell body 1 .

[0045] Further, the cell body 1 is a laminated cell.

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Abstract

The invention discloses a lithium battery preventing falling and failure and a preparation method of the lithium battery and belongs to the field of lithium-ion battery technologies. According to a specific scheme, the lithium battery preventing falling and failure comprises a battery film shell and a cell arranged in the battery film shell, the cell comprises a cell body and a membrane lamination, the membrane lamination is integrally connected with the cell body and located at the tail of the cell body, the membrane lamination is of a flaky structure which is formed by fusing a plurality oflayers of membranes extending in the length direction of the cell body, and the membrane lamination is tightly attached to the cell body and is folded in the thickness direction of the cell body. Through the lithium battery, the problem that the cell falls, the membranes are folded, and consequently a positive plate and a negative plate are in contact and short circuit and cause failure is effectively relieved. Since a whole plate of the cell is wrapped by the membranes, dust falling off the edge of the plate also can be wrapped in a pocket, and accordingly the problem that the cell has poor voltage drop is relieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium battery capable of preventing drop failure and a preparation method thereof. Background technique [0002] With the development of the market, portable electronic products have higher and higher requirements on the safety performance of lithium batteries. Especially for drop safety performance requirements. [0003] At present, the method of improving the drop failure in the lithium battery industry is mainly to restrain the battery cell by making a bag with a diaphragm at the head and tail of the cell to prevent the diaphragm from turning over during the drop process, and the positive and negative electrodes move and contact to cause short-circuit failure. This bag-making method is mainly used in laminated batteries. It is not suitable for wound batteries. The bounding area of ​​the separator at the head and tail of the wound battery is limit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0585H01M10/0525H01M2/34
CPCH01M10/058H01M10/0585H01M10/0525H01M50/572Y02E60/10Y02P70/50
Inventor 彭宁盛东辉朱永康徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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