Cylindrical lithium ion battery pre-charging method, production method and product obtained by production method

A lithium-ion battery, pre-charging technology, applied in secondary battery charging/discharging, final product manufacturing, non-aqueous electrolyte storage batteries, etc., can solve problems such as performance degradation, improve production quality, and promote more thorough effects

Pending Publication Date: 2019-06-21
SVOLT ENERGY TECH (MAANSHAN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the problem that the SEI film is not completely dense in the existing chemical formation method, resulting in performance degradation, the present invention provides a pre-charging method that can form a denser SEI film and improve the performance of lithium-ion batteries. This method combines battery kinetics And the advantages of the main parameters of thermodynamics, the pre-charging method is reasonable, and the gas production is less during the pre-charging process, which makes the activated lithium-ion battery more excellent in discharge performance and cycle performance, and prolongs the service life

Method used

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  • Cylindrical lithium ion battery pre-charging method, production method and product obtained by production method
  • Cylindrical lithium ion battery pre-charging method, production method and product obtained by production method

Examples

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Effect test

Embodiment 1

[0033] The present invention will be described below with reference to specific examples. Those skilled in the art can understand that these examples are only used to illustrate the present invention and do not limit the scope of the present invention in any way.

[0034] A method for precharging a cylindrical lithium-ion battery in this embodiment specifically includes the following steps:

[0035] With nickel-cobalt lithium manganese oxide as the positive electrode and graphite as the negative electrode, the electrode assembly is made by winding with a diaphragm, put into a 18650 steel shell, and 1.3mol / L LiPF is injected into it 6 / (EC+PC+DEC) electrolyte, make battery 18650 battery, put it in a high-temperature vacuum heating box at 45°C, and evacuate to 200Pa, stand still for 48h; at 45°C high temperature, charge 5% at 0.05C for 30min , charge 55% at 0.5C for 60min, charge 100% at 0.6C for 20min; put it in a high-temperature vacuum heating box at 35°C, and evacuate to 40...

Embodiment 2

[0037] A method for precharging a cylindrical lithium-ion battery in this embodiment specifically includes the following steps:

[0038] With nickel-cobalt lithium manganese oxide as the positive electrode and graphite as the negative electrode, the electrode assembly is made by winding with a diaphragm, put into a 21700 steel shell, and 1.3mol / L LiPF is injected into it 6 / (EC+PC+DEC) electrolyte, make a battery 21700 battery, put it in a high-temperature vacuum heating box at 35°C, and evacuate to 100Pa, stand still for 48h; at room temperature at 25°C, charge 5% at 0.02C for 165min , charge 55% at 0.3C for 205min, charge 100% at 0.7C for 35min; put it in a high-temperature vacuum heating box at 25°C, and evacuate it to 400Pa, and rest for 12h; 205min, turn to 1C and charge 100% for 35min, see Table 1 for cycle test.

Embodiment 3

[0040] A method for precharging a cylindrical lithium-ion battery in this embodiment specifically includes the following steps:

[0041] With nickel-cobalt lithium manganese oxide as the positive electrode and graphite as the negative electrode, the electrode assembly is made by winding with a diaphragm, put into a 18650 steel shell, and 1.3mol / L LiPF is injected into it 6 / (EC+PC+DEC) electrolyte, make battery 18650 battery, put it in a high-temperature vacuum heating box at 35°C, and evacuate to 200Pa, stand still for 96h; at room temperature at 25°C, charge 5% at 0.05C for 300min , charge 55% at 0.5C for 350min, charge 100% at 0.6C for 50min; put it in a high-temperature vacuum heating box at 25°C, and evacuate it to 400Pa, and rest for 24h; at room temperature at 10°C, discharge at 1C for 140min, charge at 0.4C for 60% 350min, turn to 0.8C to charge 100% for 50min, see Table 1 for cycle test.

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Abstract

The invention discloses a cylindrical lithium ion battery pre-charging method, a production method and a product obtained by the production method, and belongs to the technical field of lithium ion batteries. The method comprises the following steps of (1) putting the cylindrical lithium ion battery after liquid injection and sealing into a high-temperature vacuum box, and carrying out vacuumizingand standing; (2) carrying out a small-current pre-charging step; (3) putting the battery into the high-temperature vacuum box body, and carrying out vacuumizing and standing; and (4) carrying out asmall-current pre-charging, discharging and charging step. The invention provides a more compact SEI film, and the pre-charging method for better improving the performance of the lithium ion battery;the method combines the advantages of battery dynamics and thermodynamic main parameters, the pre-charging mode is reasonable, and the gas production amount in the pre-charging process is small, so that the discharge performance and the cycling performance of the activated lithium ion battery are more excellent, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and more specifically relates to a pre-charging method and production method of a cylindrical lithium-ion battery and a product obtained therefrom. Background technique [0002] Since the cylindrical lithium-ion battery came out in 1990, it has developed rapidly due to its excellent performance and has been widely used in society. Cylindrical lithium-ion batteries quickly occupy many fields with incomparable advantages of other batteries, such as well-known mobile phones, notebook computers, small cameras, etc., and more and more countries use this battery for power, energy storage, Military and other fields. This application demonstrates that cylindrical Li-ion batteries are an ideal small green power source. [0003] Formation is an important process in the production process of cylindrical lithium-ion batteries. The main functions of formation are: first, the active substances ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/058
CPCY02E60/10Y02P70/50
Inventor 罗倩李航徐强赵飞彭浩宋元哲
Owner SVOLT ENERGY TECH (MAANSHAN) CO LTD
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