Battery cell structure wrapped with inner insulating film and preparation method of battery cell structure

A technology of internal insulation and batteries, applied in structural parts, electrolyte battery manufacturing, circuits, etc., can solve problems such as poor contact and side reactions, achieve the effects of reducing expansion force, reducing thickness, and improving shell entry efficiency

Pending Publication Date: 2022-08-05
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the prior art, such as side reactions caused by poor interface contact of the pole piece in the bare cell, the present invention provides a cell structure wrapped with an inner insulating film and a preparation method thereof. Put in a suitable size inner insulating film protective cover, and use high temperature to heat the inner insulating film protective cover so that it tightly wraps the bare cell, and then put the bare cell into the battery case for sealing; the cell structure It can effectively prevent the loosening of the bare cells inside the cell, and prevent the leakage of light from the laser welding of the cell to cause safety hazards, and further delay the thermal runaway speed of the cell

Method used

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  • Battery cell structure wrapped with inner insulating film and preparation method of battery cell structure
  • Battery cell structure wrapped with inner insulating film and preparation method of battery cell structure
  • Battery cell structure wrapped with inner insulating film and preparation method of battery cell structure

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specific Embodiment approach

[0030] In order to clearly and completely describe the technical solution of the present invention and its specific working process, with reference to the accompanying drawings, the specific embodiments of the present invention are as follows:

[0031] In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the dif...

Embodiment 1

[0050] In this embodiment, a cell structure wrapped with an inner insulating film includes a bare cell and an inner insulating film protective cover wrapped thereon. The thickness of the bare cell is 14.40mm; after the two bare cells are connected in parallel, they are welded together with the battery cover by ultrasonic welding and fixed with tape; A flame-retardant mica patch is arranged between the thermoplastic inner insulating film protective sleeve and the bare cell, and the flame-retardant mica patch is in contact with the bottom and side of the thermoplastic inner insulating film protective sleeve, and is bonded by glue; The thickness of the flame-retardant mica patch on the side of the cell is 0.2mm, the thickness of the flame-retardant mica patch at the top of the bare cell is 0.5mm, and the thickness of the flame-retardant mica patch at the bottom of the cell is 1mm; The number of flame-retardant mica patches located on the side of the bare cell is determined accord...

Embodiment 2

[0058] In this embodiment, a cell structure wrapped with an inner insulating film includes a bare cell and an inner insulating film protective cover wrapped thereon. The thickness of the bare cell is 14.40mm; after the two bare cells are connected in parallel, they are welded together with the battery cover by ultrasonic welding and fixed with tape; A flame-retardant mica patch is arranged between the thermoplastic inner insulating film protective sleeve and the bare cell, and the flame-retardant mica patch is in contact with the bottom and side of the thermoplastic inner insulating film protective sleeve, and is bonded by glue; The thickness of the flame-retardant mica patch on the side of the cell is 0.2mm, the thickness of the flame-retardant mica patch at the top of the bare cell is 0.5mm, and the thickness of the flame-retardant mica patch at the bottom of the cell is 1mm; The number of flame-retardant mica patches located on the side of the bare cell is determined accord...

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Abstract

The invention discloses a battery cell structure wrapped with an inner insulating film and a preparation method of the battery cell structure, and belongs to the technical field of lithium ion batteries, the battery cell structure comprises a naked battery cell and an inner insulating film protective sleeve wrapping the naked battery cell, and the inner insulating film protective sleeve wraps the outer surface of the naked battery cell in a heating mode. And a flame-retardant mica patch is arranged between the inner insulating film protective sleeve and the naked battery cell and is used for preventing the top of the battery cell from being burnt by laser welding light leakage and reducing internal heat conduction between the battery cells. According to the invention, the naked battery cell is placed in the inner insulating film protection sleeve with a proper size, the inner insulating film protection sleeve is heated at high temperature, so that the naked battery cell is tightly wrapped by the inner insulating film protection sleeve, and then the naked battery cell is placed in the battery shell for sealing; the battery cell structure can effectively prevent the loose phenomenon of the naked battery cell in the battery cell, prevent the potential safety hazard caused by the light leakage of the laser welding of the battery cell, and further delay the thermal runaway speed of the battery cell.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a battery core structure wrapped with an inner insulating film and a preparation method thereof. Background technique [0002] In recent years, lithium-ion power batteries have developed rapidly, especially square power batteries, which occupy most of the market due to their high capacity and easy modularization. After the core is put into the metal battery case, the bare cell is easy to loosen, resulting in poor interface contact and affecting long-term use; now the bare cell is mostly used with a dispensing diaphragm, and the bare cell using the dispensing diaphragm can be effectively shaped by hot pressing, and the interface is sticky. They are tied together, but they will be separated due to expansion in the later period of the cycle; after the bare cells are connected in parallel, a large amount of tape is required. The use of a thermoplastic inner ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/103H01M10/058H01M10/05
CPCH01M50/103H01M10/058H01M10/05Y02P70/50
Inventor 闫晟睿姜涛刘晓蕾别晓非翟喜民赵光宇孙焕丽
Owner CHINA FIRST AUTOMOBILE
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