Method for producing lithium-ion secondary battery membrane

A lithium-ion battery and production method technology, applied in the field of battery diaphragm production, can solve the problems of complex manufacturing process and high production cost

Inactive Publication Date: 2019-09-17
LIYANG YUEQUAN ELECTRIC ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to its excellent characteristics and thin thickness, the wet-process separator is suitable for high-energy-density ternary battery systems. Compared with the dry film-making process, its manufacturing process is complicated and the production cost is high. A large number of wet-process separators are used in the field of electric vehicle batteries. Diaphragm, presents certain challenges

Method used

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  • Method for producing lithium-ion secondary battery membrane
  • Method for producing lithium-ion secondary battery membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Such as figure 1 Shown, a kind of production method of lithium-ion secondary battery diaphragm, comprises in the step of method:

[0063] Preparation of microporous diaphragms by lithium-ion battery diaphragm production process;

[0064] Slitting the microporous membrane through a cutting system to obtain a semi-finished microporous membrane;

[0065] Four rolls of the semi-finished microporous diaphragm are compounded in four layers by a composite device to obtain a composite microporous diaphragm; wherein, the thickness of the film in the semi-finished microporous diaphragm is 36 μm; biaxial stretching, and the longitudinal ratio of biaxial stretching and horizontal draw ratio are both 2;

[0066] Stretching the composite microporous membrane;

[0067] The stretched composite microporous diaphragm is peeled off by a stripping device to obtain a finished microporous diaphragm; the thickness of the film in the finished microporous diaphragm is 9 μm.

[0068] In this...

Embodiment 2

[0085] The method of the present embodiment is basically the same as the embodiment one, the difference is: the viscosity-average molecular weight of the polyethylene is 3,000,000,

[0086] The mass percent of polyethylene is 25%,

[0087] The mass percentage of the pore forming agent is 75%.

[0088] The cooling temperature was 30°C.

[0089] The temperature of the heat treatment was 132°C.

Embodiment 3

[0091] The method of the present embodiment is basically the same as the embodiment one, the difference is: the viscosity-average molecular weight of the polyethylene is 2,000,000,

[0092] The mass percent of polyethylene is 30%,

[0093] The mass percentage of the pore forming agent is 70%.

[0094] The cooling temperature was 30°C.

[0095] The temperature of the heat treatment was 132°C.

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Abstract

The invention discloses a method for producing a lithium-ion secondary battery membrane. The method comprises the steps of preparing a microporous membrane by a lithium-ion battery membrane production process, cutting the microporous membrane to obtain a semi-finished microporous membranes, performing layer composition on at least two semi-finished microporous membranes to obtain a composite microporous membrane, stretching the composite microporous membrane, and peeling a corresponding layer of the stretched composite microporous membrane to obtain a finished microporous membrane. According to the method of the invention, the membrane forming efficiency can be improved, and the production capacity is expanded.

Description

technical field [0001] The invention relates to a production method of a lithium-ion secondary battery diaphragm, belonging to the technical field of battery diaphragm production. Background technique [0002] At present, lithium-ion secondary batteries are more and more widely used in consumer electronics, electric vehicles, and energy storage because of their high energy density and long cycle life. [0003] The separator is one of the important components of the lithium-ion secondary battery, which has a great influence on the characteristics of the battery, especially on the safety of the battery. Diaphragms can be divided into dry-process diaphragms and wet-process diaphragms according to their manufacturing methods. Due to its excellent characteristics and thin thickness, the wet-process separator is suitable for high-energy-density ternary battery systems. Compared with the dry film-making process, its manufacturing process is complicated and the production cost is h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/18H01M10/0525
CPCH01M10/0525H01M50/403H01M50/463Y02E60/10
Inventor 李大伟张剑刘勇标中山生龙
Owner LIYANG YUEQUAN ELECTRIC ENERGY CO LTD
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