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Formation method of high-temperature lithium ion battery

A technology of lithium ion battery and chemical formation method, which is applied in secondary batteries, battery electrodes, electrochemical generators, etc., can solve the problems of large differences in battery performance and large impact on overall performance, and avoid excessive temperature rise of batteries. , The effect of reducing the internal resistance of the battery and improving the stability

Inactive Publication Date: 2020-12-29
苏州酷卡环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the field of lithium-ion battery production, the formation method of the battery has a great influence on the performance of the battery, but the general formation method is relatively fixed, but because the specific conditions of the formation battery are different, when the same formation method is used, the battery will be damaged. The performance difference of the lithium-ion battery is relatively large, and it has a great influence on the overall performance of the later batteries when they are grouped. In order to solve the above problems, the present invention provides a high-temperature lithium-ion battery formation method. Carry out measurements to determine the specific formation mode for the temperature change of the battery, so as to meet the specific needs of different battery situations. The battery obtained by the formation method of the present invention has excellent and stable high-temperature cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Inject a predetermined metered first electrolyte into the battery, the first electrolyte accounts for 70% of the total electrolyte volume, and contains 3.5% by volume of vinylene carbonate;

[0045] 2) Use a current of 0.2C to charge the battery with a constant current for 1 hour;

[0046] 3) Measure the battery temperature;

[0047] 4) Comparing the battery temperature with a predetermined threshold, the predetermined threshold is 45 degrees Celsius, if the battery temperature is higher than the predetermined threshold, the first formation mode is used for formation; if not, the second formation mode is used for formation;

[0048] The first formation mode includes:

[0049] 1) 0.1C constant current charging to a first predetermined voltage, and the first predetermined voltage is 3.65V;

[0050] 2) Injecting the second electrolyte, which accounts for 15% of the total electrolyte volume and contains 4.8% by volume of 1,3-propene sultone;

[0051] 3) Constant volta...

Embodiment 2

[0068] 1) Inject a predetermined metered first electrolyte into the battery, the first electrolyte accounts for 70% of the total electrolyte volume, and contains 3.5% by volume of vinylene carbonate;

[0069] 2) Use a current of 0.2C to charge the battery with a constant current for 1 hour;

[0070]3) Measure the battery temperature;

[0071] 4) Comparing the battery temperature with a predetermined threshold, the predetermined threshold is 47 degrees Celsius, if the battery temperature is higher than the predetermined threshold, the first formation mode is used for formation; if not, the second formation mode is used for formation;

[0072] The first formation mode includes:

[0073] 1) 0.1C constant current charging to the first predetermined voltage, the first predetermined voltage is 3.68V;

[0074] 2) Injecting the second electrolyte, which accounts for 15% of the total electrolyte volume and contains 4.8% by volume of 1,3-propene sultone;

[0075] 3) Constant voltage ...

Embodiment 3

[0092] 1) Inject a predetermined metered first electrolyte into the battery, the first electrolyte accounts for 70% of the total electrolyte volume, and contains 3.5% by volume of vinylene carbonate;

[0093] 2) Use a current of 0.2C to charge the battery with a constant current for 1 hour;

[0094] 3) Measure the battery temperature;

[0095] 4) Comparing the battery temperature with a predetermined threshold, the predetermined threshold is 46 degrees Celsius, if the battery temperature is higher than the predetermined threshold, the first formation mode is used for formation; if not, the second formation mode is used for formation;

[0096] The first formation mode includes:

[0097] 1) 0.1C constant current charging to the first predetermined voltage, the first predetermined voltage is 3.66V;

[0098] 2) Injecting the second electrolyte, which accounts for 15% of the total electrolyte volume and contains 4.8% by volume of 1,3-propene sultone;

[0099] 3) Constant voltage...

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Abstract

The invention provides a formation method of a high-temperature lithium ion battery. A positive electrode active material of the high-temperature lithium ion battery is a lithium iron phosphate seriesactive material. The formation method comprises the following steps: injecting a first electrolyte, carrying out constant-current charging on a battery at a predetermined current for predetermined time, measuring the temperature of the battery, and comparing the temperature of the battery with a predetermined threshold value; if the battery temperature is higher than the preset threshold value, performing formation by adopting a first formation mode; and if not, performing formation by adopting a second formation mode. According to the formation method, the battery is measured in the formation process, and the specific formation mode is determined according to the temperature change of the battery so that the specific requirements of different battery conditions are met, and the battery obtained by the formation method has excellent and stable high-temperature cycle performance.

Description

technical field [0001] The invention relates to a method for forming a high-temperature lithium-ion battery. Background technique [0002] In the field of lithium-ion battery production, the formation method of the battery has a great influence on the performance of the battery, but the general formation method is relatively fixed, but because the specific conditions of the formation battery are different, when the same formation method is used, the battery will be damaged. The performance difference of the lithium-ion battery is relatively large, and it has a great influence on the overall performance of the later batteries when they are grouped. In order to solve the above problems, the present invention provides a high-temperature lithium-ion battery formation method. Measurement is carried out to determine the specific formation mode according to the temperature change of the battery, so as to meet the specific needs of different battery conditions. The battery obtained ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M4/58H01M10/0567
CPCH01M4/5825H01M10/0567H01M10/058H01M2004/028H01M2300/0088Y02E60/10Y02P70/50
Inventor 李壮
Owner 苏州酷卡环保科技有限公司