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Formation method of power lithium ion battery in high-temperature environment

A technology of lithium-ion batteries and formation methods, which is applied in the field of formation of power lithium-ion batteries used in high-temperature environments, and can solve problems such as affecting the cycle life of power lithium-ion batteries, difficult to cool the temperature of the battery core, and increasing the production cost of battery packs , to achieve good temperature resistance, improve high temperature stability, and improve cycle performance

Inactive Publication Date: 2020-05-15
朱虎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the high output and high current working environment of the power lithium-ion battery, the battery temperature is generally relatively high during operation, and the high temperature environment will seriously affect the cycle life of the power lithium-ion battery. In the prior art, the power lithium-ion battery pack is generally Set the cooling system to reduce the working temperature of the battery pack, but the cooling system increases the production cost of the battery pack, maintenance costs, and the weight and volume of the battery pack, and the cooling system is difficult to cool the temperature inside the battery core, so for the battery Working life effect doesn't help much

Method used

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  • Formation method of power lithium ion battery in high-temperature environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The electrolyte is 1M lithium hexafluorophosphate, and the solvent is composed of ethylene carbonate and propylene carbonate with a volume ratio of 2:1; the volume percentage of 1,3-propene sultone, vinylene carbonate and vinyl sulfate in the additive The contents are respectively 1%, 0.6%, 1.8%.

[0030] 1) Charge to a first predetermined voltage with a constant current of 0.02C, and the first predetermined voltage is 3.35V;

[0031] 2) 4 cycles of 0.05C constant current charging and discharging between the first predetermined voltage and the discharge cut-off voltage, the discharge cut-off voltage being 2.75V;

[0032] 3) Constant voltage charging with the first predetermined voltage until the charging current is lower than 0.01C;

[0033] 4) Constantly charge with a current of 0.02C to a second predetermined voltage, and the second predetermined voltage is 4.05V

[0034] 5) Constant voltage charging with the second predetermined voltage until the charging current i...

Embodiment 2

[0040] The electrolyte is 1M lithium hexafluorophosphate, and the solvent is composed of ethylene carbonate and propylene carbonate with a volume ratio of 1:2; the volume percentage of 1,3-propene sultone, vinylene carbonate and vinyl sulfate in the additive The contents are respectively 1.5%, 0.8%, 2.0%.

[0041] 1) Charging to a first predetermined voltage with a constant current of 0.05C, and the first predetermined voltage is 3.40V;

[0042] 2) 4 cycles of 0.05C constant current charging and discharging between the first predetermined voltage and the discharge cut-off voltage, the discharge cut-off voltage being 2.75V;

[0043] 3) Constant voltage charging with the first predetermined voltage until the charging current is lower than 0.01C;

[0044] 4) Charging with a constant current of 0.05C to a second predetermined voltage, the second predetermined voltage is 4.10V

[0045] 5) Constant voltage charging with the second predetermined voltage until the charging current i...

Embodiment 3

[0051] The electrolyte is 1M lithium hexafluorophosphate, and the solvent is composed of ethylene carbonate and propylene carbonate with a volume ratio of 1:1; the volume percentage of 1,3-propene sultone, vinylene carbonate and vinyl sulfate in the additive The contents are respectively 1.2%, 0.7%, 1.9%.

[0052] 1) Charging to a first predetermined voltage with a constant current of 0.03C, and the first predetermined voltage is 3.40V;

[0053] 2) 4 cycles of 0.05C constant current charging and discharging between the first predetermined voltage and the discharge cut-off voltage, the discharge cut-off voltage being 2.75V;

[0054] 3) Constant voltage charging with the first predetermined voltage until the charging current is lower than 0.01C;

[0055] 4) Constantly charge with a current of 0.03C to a second predetermined voltage, and the second predetermined voltage is 4.10V

[0056] 5) Constant voltage charging with the second predetermined voltage until the charging curre...

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Abstract

The invention provides a formation method of a power lithium ion battery in a high-temperature environment, a positive electrode active substance of the lithium ion battery is a manganese-based transition metal lithium oxide, an electrolyte comprises an organic solvent and an additive, and the solvent is composed of ethylene carbonate and propylene carbonate; the additive is prepared from 1, 3-propylene sultone, vinylene carbonate and ethylene sulfate, and the volume ratio of the 1, 3-propylene sultone to the vinylene carbonate to the ethylene sulfate is (1 to 1.5) to (0.6 to 0.8) to (1.8 to 2.0). The formation method comprises the following steps: carrying out pre-charging in a voltage range not higher than a first preset voltage, and carrying out pulse charging in a voltage range not lower than a second preset voltage. The cycle life of the lithium ion battery obtained by the method in a high-temperature environment is greatly prolonged.

Description

technical field [0001] The invention relates to a method for forming a power lithium-ion battery used in a high-temperature environment. Background technique [0002] Due to the high output and high current working environment of the power lithium-ion battery, the battery temperature is generally relatively high during operation, and the high temperature environment will seriously affect the cycle life of the power lithium-ion battery. In the prior art, the power lithium-ion battery pack is generally Set the cooling system to reduce the working temperature of the battery pack, but the cooling system increases the production cost of the battery pack, maintenance costs, and the weight and volume of the battery pack, and the cooling system is difficult to cool the temperature inside the battery core, so for the battery The working life effect doesn't help much. Contents of the invention [0003] The invention provides a method for forming a power lithium-ion battery used in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0525H01M10/0567H01M10/0569H01M10/058
CPCH01M10/0525H01M10/0567H01M10/0569H01M10/058H01M10/446H01M2300/0037Y02E60/10Y02P70/50
Inventor 朱虎
Owner 朱虎
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