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Temperature-controlled and voltage-controlled lithium battery formation method

A chemical formation method, lithium battery technology, applied in the direction of secondary batteries, electrochemical generators, non-aqueous electrolyte batteries, etc., can solve the problems of hard contact pressure, unevenness, etc., and achieve high security, uniform and controllable temperature, Fast and controllable effect of temperature control and pressure control

Inactive Publication Date: 2019-07-02
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to address the above-mentioned defects and provide a temperature-controlled and pressure-controlled lithium battery formation method, which can not only simplify the lithium battery formation process, but also solve a series of problems caused by hard contact and uneven pressure during the fixture heating and pressing method. kind of problem

Method used

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  • Temperature-controlled and voltage-controlled lithium battery formation method
  • Temperature-controlled and voltage-controlled lithium battery formation method

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Preferably, the above-mentioned feature items form a chemical formation method with constant temperature and pressure after wrapping, and its specific implementation is as follows:

[0045] Wrap the lithium iron phosphate-graphite soft-packed lithium-ion battery in a PE plastic bag and place it in an alkyl diphenyl ether type heat transfer oil at 45°C and 600KPa. Keep the temperature and pressure, and charge the lithium-ion battery at a constant current of 0.5C 3.5V, let it stand for 30 minutes, and then discharge it to 2V with a constant current of 0.5C. After the completion, release the pressure and cool down, take out the lithium battery and remove the package.

Embodiment 2

[0047] Preferably, the above-mentioned feature items form a chemical formation method with constant temperature and constant pressure after pre-formation, and its specific implementation is as follows:

[0048] The ternary-graphite soft pack lithium-ion battery preformed to 3.8V is wrapped with rubber and placed in an alkyl diphenyl ether type heat transfer oil at 45°C and 700KPa. Current charge 4.2V, let stand for 30 minutes, and then 0.5C constant current discharge to 2.8V. After the completion, release the pressure and cool down, take out the lithium battery and remove the package.

Embodiment 3

[0050] It is preferable that the above-mentioned characteristic items form a kind of chemical formation method of changing temperature and pressure after wrapping, and its specific implementation is as follows:

[0051] Wrap the lithium iron phosphate-graphite soft-packed lithium-ion battery with aluminum-plastic film and place it in low-temperature heat transfer oil at -20°C and 600KPa, such as Therminol-VP-1, Dowtherm-A in the United States, Therm-S-300 in Japan, and Therm-S-300 in Germany. In Diphyl or China Jiuxing Y-DS Daosheng oil, charge the lithium battery at 0.5C constant current to 2.8V, keep the temperature and pressure and let it stand for 30 minutes; then release the pressure and replace it with a flame-retardant solution at 45°C and 400KPa, and then keep the temperature And pressure 0.5C constant current charge to 3.5V; then the same environment 0.5C constant current discharge to 2V, finally release the pressure and replace it with low-temperature heat transfer oil ...

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Abstract

The invention discloses a temperature-controlled and voltage-controlled lithium battery formation method. An isotropic medium environment with controllable temperature and pressure is adopted. A sealed lithium battery is placed in the medium environment, and lithium battery formation is carried out through temperature and pressure control. The formation method not only can simplify the process oflithium battery formation, but also can solve a series of problems caused by hard contact and uneven pressure and temperature during clamp heating and pressurizing. The method is worth popularizing.

Description

technical field [0001] The invention relates to lithium battery formation technology, more specifically to a temperature-controlled and pressure-controlled lithium battery formation method. Background technique [0002] Lithium battery formation refers to the process of charging and discharging the lithium battery after the lithium ion lithium battery is assembled. During this process, the lithium battery system will be activated, so the manufacturing process is an extremely important link. Through formation, a layer of solid electrolyte interface passivation layer, that is, SEI film, will be formed on the surface of the material of the lithium battery. [0003] The traditional formation process is to make the lithium battery form a film stably and fully under stable temperature and pressure through trickle charge and discharge. However, the SEI film formed by this method has a compact structure and small pores, so high-temperature aging is required to restructure the SEI f...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525H01M10/44
CPCH01M10/0525H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 李铮铮吕忱孙中渠张丕军
Owner BAOSHAN IRON & STEEL CO LTD
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