Battery and preparation method thereof

A technology for batteries and batteries, applied in the field of batteries and their preparation, can solve the problems of difficult assembly process and difficulty in ensuring the consistency of the gap between batteries and batteries, and achieve the effects of high safety, reduced production costs, and long cycle life

Active Publication Date: 2019-12-03
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the reserved expansion space during cell assembly brings great difficulties to the assembly process, and it is also difficult to ensure the consistency of the gap betwe

Method used

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  • Battery and preparation method thereof

Examples

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preparation example Construction

[0054] Next, the preparation method of the battery according to the second aspect of the present invention is described, which is used to prepare the battery described in the first aspect of the present invention, comprising the steps of:

[0055](1) Coating the positive electrode slurry comprising the positive electrode active material on the positive electrode current collector, drying and cold pressing to obtain the positive electrode sheet, coating the negative electrode slurry comprising the negative electrode active material on the negative electrode current collector, drying, cold pressing After pressing, the negative electrode sheet is obtained, wherein the initial thickness of the positive electrode diaphragm in the positive electrode sheet is H 1 , the initial thickness of the negative electrode diaphragm in the negative electrode sheet is H 2 ;

[0056] (2) Assemble the positive pole piece, negative pole piece, separator, and electrolyte prepared in step (1) into t...

Embodiment 1

[0062] (1) Preparation of pole piece

[0063] Carbon coated LiFePO 4 (The thickness of the carbon coating layer is 6nm, LiFePO 4 It is a primary particle structure with an average particle size of 120nm) as the positive electrode active material, acetylene black as the conductive agent, polyvinylidene fluoride as the binder, and N-methylpyrrolidone as the solvent. Stir and mix the above raw materials to form a positive electrode Slurry, wherein the weight ratio of the positive electrode active material, conductive agent, and binder is 94:4:2; then the positive electrode slurry is evenly coated on the upper and lower surfaces of the positive electrode current collector aluminum foil, and dried at 85 ° C Afterwards, it is cold pressed, and then cut to form positive electrode sheets of predetermined size.

[0064] Artificial graphite (non-acicular coke secondary particles, graphitization degree of 94%) is used as the negative electrode active material, acetylene black is used a...

Embodiment 2

[0072] The preparation process of the battery is the same as in Example 1, the difference is that:

[0073] The height of the protrusions on the surface of the positive electrode membrane was 15 μm.

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Abstract

The invention provides a battery and a preparation method thereof. The battery comprises a battery cell and an electrolyte, and the battery cell comprises a positive pole piece, a negative pole pieceand an isolating membrane. In the battery, salient points are arranged on the surface of a positive electrode diaphragm and/or a negative electrode diaphragm, wherein the heights of the salient pointsarranged on the surface of the positive electrode diaphragm are Tc, the heights of the salient points arranged on the surface of the negative electrode diaphragm are Ta, the thickness increase amountof the positive electrode diaphragm when the state of charge of the battery is 100% SOC is Hc, the thickness increase amount of the negative electrode diaphragm when the state of charge of the battery is 100% SOC is Ha, and 0.3<=(Tc+Ta)/(Hc+Ha)<=1. According to the invention, the expansion force of the battery in the whole life cycle can be effectively reduced, so that the battery has the characteristics of the high safety and the long cycle life.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery and a preparation method thereof. Background technique [0002] As the core area of ​​the development of the new energy vehicle industry, power batteries have always been the focus of widespread attention. However, with the continuous application and promotion of new energy vehicles, people's requirements for the energy density of power batteries are getting higher and higher. In order to increase the energy density of the power battery, the current widely adopted method is to increase the compaction density of the positive and negative electrodes, increase the coating weight per unit area of ​​the current collector, etc., in order to obtain the compression of the internal space of the battery cell. However, in the actual application process, due to changes in the physical force of the cell material itself or due to the accumulation of side reaction products inside th...

Claims

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Application Information

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IPC IPC(8): H01M10/04H01M4/02
CPCH01M10/04H01M4/02H01M10/48H01M4/0435H01M4/0404H01M2004/021H01M2004/025Y02E60/50Y02E60/10Y02P70/50G01R31/392H01M4/8828H01M10/0418H01M10/0459
Inventor 杨丽美刘晓梅
Owner CONTEMPORARY AMPEREX TECH CO
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