Pressure-resistant composite film for lithium battery and preparation method of pressure-resistant composite film

A composite membrane and lithium battery technology, applied in battery pack parts, chemical instruments and methods, applications, etc., can solve the problems of battery bulging deformation, easy collapse, and affecting battery safety, etc., to solve the problem of flatulence, bulging deformation, and good shell flushing Performance, the effect of improving the pressure resistance

Pending Publication Date: 2022-03-01
JIANGXI MING CROWN LITHIUM MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The aluminum-plastic composite film is relatively soft. After packaging into a battery, the gas generated by charging and discharging will easily deform the battery pack, and cause certain mutual extrusion deformation inside the battery module, which will affect the safety of the battery.
[0005] 2. During the shelling process of the pouch battery, if i

Method used

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  • Pressure-resistant composite film for lithium battery and preparation method of pressure-resistant composite film
  • Pressure-resistant composite film for lithium battery and preparation method of pressure-resistant composite film
  • Pressure-resistant composite film for lithium battery and preparation method of pressure-resistant composite film

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A kind of pressure-resistant composite film for lithium battery and preparation method thereof:

[0028] see figure 1 , a pressure-resistant composite film for a lithium battery, comprising a protective layer 1, a first adhesive layer 2, a first corrosion-resistant coating 3, a pressure-resistant layer 4, and a second corrosion-resistant coating 5 arranged in sequence from top to bottom , second adhesive layer 6, heat seal layer 7, slip agent layer 8, protective layer 1, first adhesive layer 2, first corrosion-resistant coating 3, pressure-resistant layer 4, second corrosion-resistant coating 5 , the second adhesive layer 6 and the heat-sealing layer 7 are formed into an integral composite film structure by dry lamination or high-temperature hot pressing, and the slip agent layer 8 is coated on the lower surface of the heat-sealing layer 7 .

[0029] Wherein, the thickness of the protective layer 1 is 10-60 μm, and the thickness of the protective layer 1 in this embod...

Embodiment 2

[0041] This embodiment is basically the same as Embodiment 1, except that the material of the pressure-resistant layer 4 is rolled copper foil.

[0042] After testing, the pressure-resistant composite film for lithium batteries prepared in this embodiment has a depth of 8.2mm when the shell is damaged; image 3 with Figure 4 In the middle stretch position 11), there is a collapse phenomenon; in the case of inflation of 1.0kgf, the battery swells seriously.

Embodiment 3

[0044] This embodiment is basically the same as Embodiment 1, except that the pressure-resistant layer 4 is made of rolled stainless steel foil.

[0045] After testing, the pressure-resistant composite film for lithium batteries prepared in this example has a depth of 5.1 mm when the shell is damaged; after punching the shell 5 mm, press the top angle ( image 3 with Figure 4 In the middle stretching position 11), there is no collapse phenomenon; in the case of inflation of 1.0kgf, the battery has a slight swelling; in the case of inflation of 1.5kgf, the battery swelling is serious.

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Abstract

The invention discloses a pressure-resistant composite film for a lithium battery and a preparation method of the pressure-resistant composite film, and the pressure-resistant composite film comprises a protective layer, a first bonding layer, a first corrosion-resistant coating, a pressure-resistant layer, a second corrosion-resistant coating, a second bonding layer, a heat sealing layer and a slipping agent layer which are sequentially arranged from top to bottom, the protective layer, the first bonding layer, the first corrosion-resistant coating, the pressure-resistant layer, the second corrosion-resistant coating, the second bonding layer and the heat sealing layer are formed into an integral composite film structure through dry compounding or high-temperature hot pressing, the lower surface of the heat sealing layer is coated with the slipping agent layer, the thickness of the pressure-resistant layer is 10-150 microns, and the pressure-resistant layer is made of one of copper foil, aluminum foil and steel foil. According to the composite film for the soft package battery, the metal foil with higher hardness is adopted by the pressure-resistant layer, so that the hardness of the composite film for the soft package battery is improved, the pressure-resistant capability of the battery is further improved, and meanwhile, the slipping agent is coated on the surface of the heat sealing layer, so that the shell punching performance is improved, and the composite film has the advantages of good shell punching performance, pressure-resistant performance and the like at the same time.

Description

technical field [0001] The invention belongs to the technical field of lithium battery outer packaging materials, in particular to a pressure-resistant composite film for lithium batteries and a preparation method thereof. Background technique [0002] The current outsourcing types of lithium batteries are mainly divided into three systems: soft pack, square, and cylinder. Among them, the representative outsourcing material for soft pack lithium batteries is aluminum-plastic composite film, the outsourcing material for square lithium batteries is usually aluminum shell, and the outsourcing material for cylindrical lithium batteries is The material is usually a steel shell. Both the aluminum shell and the steel shell have the advantages of strong internal pressure resistance, and have the characteristics of being stable and not deformed when the internal gas is pressurized. In the case of short circuit, etc., the air pressure is not easy to discharge, and it is easy to cause...

Claims

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Application Information

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IPC IPC(8): B32B15/20
CPCB32B15/20B32B15/18B32B15/085B32B15/088B32B15/09B32B27/32B32B27/36B32B27/34B32B27/08B32B33/00B32B7/12B29D7/01H01M50/126H01M50/119H01M50/121H01M50/131H01M50/134H01M50/105B32B2307/536B32B2457/10B32B2255/10B32B2255/24B32B2307/714Y02E60/10
Inventor 张曙光李成利张鹏陈耀仓
Owner JIANGXI MING CROWN LITHIUM MEMBRANE TECH CO LTD
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