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Method for improving liquid injection efficiency in battery preparation process and improving battery cell performance

A preparation process and liquid injection technology, which is applied in the manufacture of electrolyte batteries, battery components, non-aqueous electrolyte batteries, etc., can solve the problems of unfavorable industrial production and application, increasing the absorption rate of battery pole pieces, and cumbersome operation process, etc. Achieve the effect of solving the long time-consuming activation, eliminating the activation steps, and improving the efficiency of liquid injection

Inactive Publication Date: 2019-03-26
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can increase the absorption rate of the battery pole piece to the electrolyte, but the operation process is cumbersome, which is not conducive to industrial production and application

Method used

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  • Method for improving liquid injection efficiency in battery preparation process and improving battery cell performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment provides a method for improving the liquid injection efficiency and improving the performance of the battery cell during the preparation of the cylindrical battery, including:

[0042] (1) Prepare a cylindrical battery semi-finished product including a battery cell, a casing, a liquid injection hole and a cap.

[0043] Among them, the battery core is wound by a positive electrode sheet, a separator and a negative electrode sheet, and the separator separates the positive electrode sheet and the negative electrode sheet.

[0044] (2) Heat the electrolyte to 50°C before injecting the liquid, and then inject the cell from the liquid injection hole;

[0045] (3) Sealing, coating, and formation to obtain a cylindrical battery.

[0046] The preparation of the cylindrical battery in this example does not require an activation step. Compared with the process of preparing the battery directly at room temperature (~25°C) without heating the electrolyte in Comparat...

Embodiment 2

[0049] This embodiment provides a method for improving the liquid injection efficiency and improving the performance of the battery cell during the preparation of the cylindrical battery, including:

[0050] (1) Prepare a cylindrical battery semi-finished product including a battery cell, a casing, a liquid injection hole and a cap.

[0051] Among them, the battery core is wound by a positive electrode sheet, a separator and a negative electrode sheet, and the separator separates the positive electrode sheet and the negative electrode sheet.

[0052] (2) Heat the electrolyte to 45°C before injecting the liquid, and then inject the cell from the liquid injection hole;

[0053] (3) Sealing, coating, and formation to obtain a cylindrical battery.

[0054] In this example, no activation step is required to prepare the cylindrical battery. Compared with the process of preparing the battery directly at room temperature (~25°C) without heating the electrolyte in Comparative Example ...

Embodiment 3

[0057] This embodiment provides a method for improving the liquid injection efficiency and improving the performance of the battery cell during the preparation of the cylindrical battery, including:

[0058] (1) Prepare a cylindrical battery semi-finished product including a battery cell, a casing, a liquid injection hole and a cap.

[0059] Among them, the battery core is wound by a positive electrode sheet, a separator and a negative electrode sheet, and the separator separates the positive electrode sheet and the negative electrode sheet.

[0060] (2) Heat the electrolyte to 55°C before injecting the liquid, and then inject the cell from the liquid injection hole;

[0061] (3) Sealing, coating, and formation to obtain a cylindrical battery.

[0062] The preparation of cylindrical batteries in this example does not require an activation step. Compared with the process of preparing batteries directly at room temperature (~25°C) without heating the electrolyte in Comparative ...

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Abstract

The invention discloses a method for improving liquid injection efficiency in a battery preparation process and improving battery cell performance and belongs to the technical field of lithium ion batteries. According to the method disclosed by the invention, electrolyte is heated to 45 to 55 DEG C before a liquid injection process of the battery preparation, and by heating the electrolyte under specific conditions, an effect of heating pole pieces can be achieved after liquid injection, and the liquid absorption path and efficiency of the pole pieces are improved. The method disclosed by theinvention has the advantages that the problems such as liquid injection difficulty, slow liquid absorption, long activation time and the like are solved, the battery cell performance is improved, direct and continuous automatic production after liquid injection is realized, and the degree of automation can be greatly improved. The method disclosed by the invention is high in liquid injection efficiency, high in liquid absorption rate of the pole pieces and short in production cycle. Compared with a process of directly preparing batteries at a normal temperature without heating the electrolyte,the liquid injection efficiency of the battery is improved by 20-60%, the liquid absorption rate of the pole pieces is improved by 20-60%, and the production cycle is shortened by 2-3 days.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a method for improving liquid injection efficiency in the battery preparation process and improving battery cell performance. Background technique [0002] Cylindrical batteries have the advantages of high capacity, long cycle life, and wide operating environment temperature, and have been widely used in many fields. As people pay more attention to the large capacity of electronic products and the long battery life of power batteries, the research and development of high energy density batteries has become a key area of ​​battery development. [0003] In the preparation process of cylindrical batteries, the process of injecting liquid (that is, injecting electrolyte solution) is a key process for manufacturing cylindrical batteries. The amount and method of liquid injection directly affect the capacity and safety performance of the battery. The liquid injection effic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/36H01M10/058H01M50/60
CPCH01M10/058H01M50/60Y02E60/10Y02P70/50
Inventor 袁军陈见帆曹嘉慧
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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