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Planar heating film for lithium ion power battery and lithium ion power battery

A power battery and heating film technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of increasing the volume of the heating film battery module, reducing the energy density of the battery module, etc., so as to eliminate the safety problem of the battery cell. Risk, uniform thickness, and the effect of improving mechanical strength

Inactive Publication Date: 2020-02-21
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of thicker silica gel fiberglass cloth and double-sided adhesive tape, this structure can alleviate the unevenness of the heating diaphragm, but it cannot fundamentally solve the problem, and it will increase the volume of the battery module occupied by the heating diaphragm and reduce the battery module. group energy density
Due to the narrow gap and shallow depth of the heating body in the heating diaphragm, it is difficult to ensure high-quality and efficient filling by general filling methods

Method used

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  • Planar heating film for lithium ion power battery and lithium ion power battery
  • Planar heating film for lithium ion power battery and lithium ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] like Figure 1 to Figure 2 As shown, the invention provides a kind of planar heating film for lithium-ion power battery, comprising:

[0056] Insulation isolation film, with a space inside the insulation isolation film;

[0057] The heating body, the heating body includes a heating body 1 and a pair of heating tabs 2, the heating body 1 is set in the placement space, the pair of heating tabs 2 protrude to the outside of the placement space, and there is a gap 6 inside the heating body 1;

[0058] The insulating filling layer 3 is arranged in the gap 6 of the heating body 1 .

[0059] In this embodiment, the heating body includes a heating body 1 and a pair of heating tabs 2. The heating body 1 is a plane S-shaped or U-shaped, thereby forming a gap 6 communicating with the outside in the heating body 1. The heating tabs 2 are used For electrical connection with the outside, the insulating isolation film is wrapped on the surface of the heating body 1 to form a sheet-sh...

Embodiment 2

[0072] The difference between the planar heating film for a lithium-ion power battery according to this embodiment and that of Embodiment 1 is that

[0073] In this embodiment, both the first insulating isolation film 4 and the second insulating isolation film 5 are made of modified polypropylene film.

[0074] Both the first insulating isolation film 4 and the second insulating isolation film 5 are made of a layer of film material.

[0075] The second insulating and isolating film 5 is made of a modified polypropylene film that can transmit ultraviolet rays.

[0076] A kind of manufacturing method of using UV glue as the plane heating film of insulating filling layer 3 is as follows:

[0077] Attach the first layer of insulating isolation film to the bottom of the heating body 1, inject the liquid insulating filling layer 3 material into the gap of the heating body 1 in a horizontal state, and ensure that the liquid level of the insulating filling layer 3 material is not low...

Embodiment 3

[0079] The difference between the planar heating film for a lithium-ion power battery according to this embodiment and that of Embodiment 1 is that

[0080] In this embodiment, the insulating filling layer 3 is made of polypropylene.

[0081] The manufacture method of the planar heating film using polypropylene material as the insulating filling layer 3 is as follows:

[0082] Fix the heating body 1 in the injection mold, keep the same distance between the two side panels of the mold and the front and back sides of the heating body 1, inject the insulating filling layer 3 material into the mold, fill the gap 6 of the heating body 1, and solidify and demould ; The first insulating isolation film 4 and the second insulating isolation film 5 are attached and placed on both sides of the heating body 1, and packaged by hot pressing, so that the first insulating isolation film 4 and the second insulating isolation film 5 are hermetically connected to form Flat heating film as a who...

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Abstract

A planar heating film for a lithium ion power battery and the lithium ion power battery are provided. The planar heating film comprises an insulating isolation film which is internally provided with aplacing space, a heating element which comprises a heating element body arranged in the placing space and provided with a gap inside and a pair of heating tabs extending out of the placing space, andan insulating filling layer which is arranged in the gap of the heating element body. According to the planar heating film for a lithium ion power battery, the gap of the heating element body is filled with the insulating filling layer, so that the heating film is consistent in thickness and smooth, the heating film can be integrally compounded with a first layer of insulating isolation film anda second layer of insulating isolation film, the risk of battery cell safety problem caused by concave-convex parts of a heating sheet can be eliminated, the bonding strength of the insulating film isimproved, and the mechanical strength of the heating sheet is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion power batteries, and more specifically relates to a planar heating film for lithium-ion power batteries and a lithium-ion power battery. Background technique [0002] At present, the heating film used in lithium-ion batteries has a structure in which the heating body is covered with an insulating layer. Since the heating body has a certain thickness, the heating body covered with the insulating layer has depressions in the gap area, resulting in irregularities on the surface of the heating sheet. smooth. Since the heating sheet needs to be closely attached to the battery cell under a certain pressure, the unevenness of the heating sheet itself will cause deformation of the internal pole piece of the battery cell. Lithium precipitation occurs on the surface of the negative electrode in the area, and lithium dendrites are generated. Lithium dendrites accumulate and pierce the diaphragm, causing...

Claims

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Application Information

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IPC IPC(8): H01M10/615H01M10/655H01M10/6571H01M10/0525
CPCH01M10/0525H01M10/615H01M10/655H01M10/6571Y02E60/10
Inventor 单晓浩毛永志张丽丽冯全玉
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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