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Method for formation screening of bad battery cores

A battery cell and bad technology, applied in the direction of circuits, electrical components, secondary batteries, etc., can solve the problems of reduced screening accuracy, battery cell identification lag, low battery capacity, etc., to eliminate excessive moisture, reduce labor costs, The effect of safe and simple operation

Pending Publication Date: 2021-11-19
NINGBO VEKEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Defects in the pre-formation process, such as excess moisture, internal short circuit, poor coating, etc., will affect the performance and safety of the battery if they cannot be picked out. The outflow of poorly coated cells will lead to large self-discharge of the cells, and combustion will occur during the formation process, resulting in irreparable economic losses
[0003] In order to be able to pick out polymer batteries with problems such as excessive moisture, internal short circuit, and poor coating before the formation process, to avoid affecting the performance and safety of the battery cells, and to avoid burning during the formation process, resulting in irreparable economic losses loss problem
[0004] At present, the conventional screening for defective products is to identify batteries in the post-formation process. In the capacity division process, batteries with excessive moisture are screened through capacity and gas production. In the OCV process, batteries with internal short circuits and poor coating are screened through the level of voltage drop after aging, and problematic batteries are identified. There will be hysteresis problems, and combustion safety problems may occur before screening. Due to the influence of equipment, aging process, personnel and environment, the screening accuracy will be reduced, causing bad batteries to flow out to the client. Core approach, aimed at solving the above problems

Method used

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  • Method for formation screening of bad battery cores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] S1. Take a battery cell whose model is thick × width × height = 4.5mm × 60mm × 80mm. After the liquid injection, the electrolyte is infiltrated well, and put it safely into the formation equipment to ensure that the main body of the battery cell is not exposed, and the tabs effectively contact the charging circuit board. , turned into vertical equipment, and the equipment software has the function of eliminating bad batteries;

[0028] S2. Open the device to clamp the cell, and clamp the cell according to the pressure of 1.0MPa;

[0029] S3. Formation charges the battery cells according to the current ladder of different rates, and adopts two-step charging;

[0030] S4. After the process of step S3 is sent, the current in the first stage is 0.1C, the cell voltage starts to increase, and the cell voltage V is detected. 1 =1.0-3.5V, screen out the voltage V 1 Instantly drop 0.1-3500mV cells, stop charging, drop more than 2-10 times in a row, cumulative drop times exceed...

Embodiment 2

[0034] S1. Take a battery cell whose model is thick × width × height = 4.5mm × 60mm × 80mm. After the liquid injection, the electrolyte is infiltrated well, and put it safely into the formation equipment to ensure that the main body of the battery cell is not exposed, and the tabs effectively contact the charging circuit board. , turned into horizontal equipment, and the equipment software has the function of eliminating bad batteries;

[0035] S2. Turn on the device to clamp the cell, and clamp the cell according to the pressure of 0.5MPa;

[0036] S3. Formation charges the battery cells according to the current ladder of different rates, and adopts two-step charging;

[0037] S4. After the process of step S3 is sent, the current in the first stage is 0.1C, the cell voltage starts to increase, and the cell voltage V is detected. 1 When = 1.0-3.5V, screen out the cells whose voltage V1 drops 0.1-3500mV instantaneously, stop charging, drop more than 2-10 times in a row, and th...

Embodiment 3

[0041] S1. Take a battery cell whose model is thick × width × height = 4.5mm × 60mm × 80mm. After the liquid injection, the electrolyte is infiltrated well, and put it safely into the formation equipment to ensure that the main body of the battery cell is not exposed, and the tabs effectively contact the charging circuit board. , turned into vertical equipment, and the equipment software has the function of eliminating bad batteries;

[0042] S2. Turn on the device to clamp the cell, and clamp the cell according to the pressure of 2.0MPa;

[0043] S3. Formation charges the battery cells according to the current ladder of different rates, and adopts two-step charging;

[0044] S4. After the process of step S3 is sent, the current in the first stage is 0.5C, the cell voltage starts to increase, and the cell voltage V is detected. 1 =1.0-3.5V, screen out the voltage V 1 Instantly drop 0.1-3500mV cells, stop charging, drop more than 2-10 times in a row, cumulative drop times exc...

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PUM

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Abstract

The invention belongs to the technical field of polymer batteries, and relates to a method for formation screening of bad battery cores. The method is characterized in that battery cores are charged through current, whether the battery cores are abnormal or not is judged by judging whether the voltage of the battery cores drops or not within a certain charging time, in the formation charging process, the formation is charged according to different multiplying power current steps, the voltage will drop, and by setting voltage drop protection, when the voltage drops in the charging process, the formation process is stopped immediately, charging is not carried out, and the bad battery cores are rejected and scrapped, so that the effect of rejecting the unqualified battery cores with excessive moisture, internal short circuit and poor coating is achieved, The screening method of the invention is rapid and accurate, is safe and simple to operate in formation equipment, is suitable for large-scale industrial production, and greatly reduces the labor cost while improving the efficiency.

Description

technical field [0001] The invention belongs to the technical field of polymer batteries, and relates to a method for forming and screening defective batteries. Background technique [0002] In the current manufacturing process of polymer batteries, formation is a key process. Defects in the pre-formation process, such as excess moisture, internal short circuit, poor coating, etc., will affect the performance and safety of the battery if they cannot be picked out. The outflow of poorly coated cells will cause large self-discharge of the cells, and combustion will occur during the formation process, resulting in irreparable economic losses. [0003] In order to be able to pick out polymer batteries with problems such as excessive moisture, internal short circuit, and poor coating before the formation process, to avoid affecting the performance and safety of the battery cells, and to avoid burning during the formation process, resulting in irreparable economic losses loss pr...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/04
CPCH01M10/446H01M10/04Y02P70/50Y02E60/10
Inventor 张衡陶胜孟旭田生伟
Owner NINGBO VEKEN BATTERY