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Lithium ion battery pole piece preparation method

A lithium-ion battery and pole piece technology, which is applied in the field of lithium-ion battery pole piece preparation, can solve the problems of low actual utilization of current collectors, achieve the effects of reducing viscosity, avoiding excessive area, and optimizing the structure of lithium-ion batteries

Active Publication Date: 2021-09-24
HIGHPOWER TECH HUIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the low actual utilization rate of current collectors in existing lithium-ion battery pole pieces, the present invention provides a preparation method for lithium-ion battery pole pieces

Method used

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  • Lithium ion battery pole piece preparation method
  • Lithium ion battery pole piece preparation method
  • Lithium ion battery pole piece preparation method

Examples

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preparation example Construction

[0030] The embodiment of the present invention provides a lithium ion battery pole piece preparation method, comprising the following steps:

[0031] 1) Provide a current collector, and paste heat-shrinkable glue on the tab position of the current collector. The heat-shrinkable glue includes a base material and an adhesive layer, and the base material is pasted on the collector through the adhesive layer. The surface of the fluid, the base material is a heat-shrinkable film, and the adhesive layer includes acrylic resin and sugar compound;

[0032] 2) Coating the active material slurry on the surface of the current collector and the heat shrinkable rubber to obtain the active material membrane;

[0033] 3) The active material diaphragm is dried at the heat shrinkage temperature of the heat shrinkable rubber. The heat shrinkable rubber on the diaphragm shrinks and falls off from the surface of the current collector, and the active material on the heat shrinkable rubber is separ...

Embodiment 1

[0055] This embodiment is used to illustrate the lithium ion battery pole piece preparation method disclosed in the present invention, comprising the following steps:

[0056] 1) Lead the current collector foil to the feeding mechanism of the coating machine, through the traction mechanism, the foil moves forward at a certain speed, calculate the moving distance of the foil through the encoder, and the automatic labeling machine according to the encoder and sensor Paste heat-shrinkable adhesives with a length of 25mm, a width of 10mm, and a thickness of 20um on the designated position of the current collector, wherein one or more heat-shrinkable adhesives can be pasted at the designated position of the current collector; the heat-shrinkable adhesive includes the base material and an adhesive layer, the base material is pasted on the surface of the current collector through the adhesive layer; the base material is a PVC heat-shrinkable film; the adhesive layer includes 50% acryl...

Embodiment 2

[0060] This example is used to illustrate the lithium ion battery pole piece preparation method disclosed in the present invention, including most of the operating steps in Example 1, the difference is that: the adhesive layer includes 70% acrylic resin and 10% Fructose, 20% sucrose, all the other operations are the same.

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Abstract

The present invention provides a lithium ion battery pole piece preparation method, which comprises: 1) providing a current collector, and pasting a thermal shrinkage adhesive on the tab position of the current collector, the thermal shrinkage adhesive comprises a base material and an adhesive layer, and the adhesive layer comprises acrylic resin and a carbohydrate compound; 2) coating the active substance slurry on the surface of a current collector; (3) drying the diaphragm at the thermal shrinkage temperature of the thermal shrinkage adhesive, so that the thermal shrinkage adhesive shrinks and separates from the surface of the current collector with the active substance on the thermal shrinkage adhesive to form a blank area which is not coated with the active substance; and 4) fixing the tab on the blank area of the current collector to obtain the required pole piece. According to the invention, the active substance is stripped by the heat-shrinkable adhesive to form a blank area for welding the tab, the area of the current collector can be more fully utilized, the adhesive of the heat-shrinkable adhesive contains carbohydrates, the initial viscosity of the adhesive can be increased, and the adhesive hanging can be avoided after heating; and the lithium ion battery prepared by using the pole piece has lower battery internal resistance and higher volume energy density.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing lithium ion battery pole pieces. Background technique [0002] With the continuous development of lithium-ion battery technology, people have put forward higher requirements for the performance of lithium-ion batteries. It is hoped that lithium-ion batteries can be smaller, lighter, and have more energy storage. Higher requirements are imposed, and the development of battery materials requires a long precipitation period. Based on this, it is very important to optimize the structural design of the battery. [0003] In the structural design of lithium-ion batteries, optimizing the proportion of active materials in lithium-ion batteries is the most effective means to increase the energy density of batteries. In the conventional battery structure design, such as figure 1 and figure 2 As shown, the production of battery pole pieces...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/04H01M10/0525
CPCH01M4/139H01M4/0404H01M10/0525Y02E60/10
Inventor 尚贞西张仔伟
Owner HIGHPOWER TECH HUIZHOU
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