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Battery leveling method

A battery and battery placement technology, applied in secondary batteries, electrochemical generators, non-aqueous electrolyte batteries, etc., can solve the problems of poor battery flatness, failure to meet production requirements, inconsistent thickness expansion of battery core pole pieces, etc., to achieve The effect of improving flatness

Inactive Publication Date: 2020-11-10
MEIZHOU LIANGNENG NEW ENERGY SCI & TECHCO
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Problems solved by technology

[0004] However, the lithium-ion battery prepared by the traditional lithium-ion battery formation method increases the charging polarization inside the battery cell due to the increase of the charging current, so that the thickness of the pole piece of the battery cell expands inconsistently, resulting in the flatness of the battery. The degree is poor and does not meet the production requirements

Method used

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  • Battery leveling method

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specific Embodiment

[0050] See Table 1 for details of the flatness detection example of the battery leveling formation method. Among them, battery numbers 1 to 5 are batteries manufactured by the traditional formation method, and battery numbers 2 to 10 are batteries manufactured by the formation method of the present application. Test point 1 Points 4 to 4 are the four corners of the battery, and test point 5 is the center point of the battery.

[0051] Table 1

[0052] battery number test point 1 test point 2 test point 3 test point 4 Test point 5 1 4.32 4.33 4.31 4.3 4.36 2 4.31 4.32 4.36 4.35 4.37 3 4.33 4.34 4.36 4.38 4.38 4 4.32 4.33 4.35 4.34 4.37 5 4.33 4.34 4.36 4.37 4.37 6 4.35 4.34 4.36 4.36 4.34 7 4.36 4.36 4.36 4.37 4.37 8 4.35 4.34 4.34 4.35 4.35 9 4.35 4.36 4.36 4.37 4.36 10 4.34 4.35 4.34 4.36 4.34

[0053] It can be seen from Table 1 that the average standard deviatio...

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Abstract

The invention provides a battery leveling method. The battery leveling formation method comprises the following steps: carrying out high-temperature shelving treatment on a to-be-formed battery; putting the battery subjected to high-temperature shelving treatment into formation equipment, and setting a plurality of formation temperatures, a plurality of formation pressures and a plurality of charging currents according to preset conditions within a plurality of continuous formation times so as to form the battery, wherein the formation temperatures, the formation pressures and the charging currents within each formation time are different, and the formation pressure is increased along with the increase of the formation time; and carrying out air exhaust, sealing and capacity grading on thebattery. By adjusting the formation pressure in the formation process to be gradually increased, the contact distance between the pole pieces in the battery cell is reduced, so the polarization increment in the battery cell is reduced, the thickness expansion of the pole pieces of the battery cell is consistent, and the flatness of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery planarization method. Background technique [0002] Lithium-ion batteries are widely used in electronic information equipment, such as mobile communications, mobile computers, electric vehicles, aerospace, military fields, biomedical engineering, etc. With the development of science and technology, people have higher and higher requirements for lithium-ion batteries, such as higher energy density, longer cycle life, and fast charging. [0003] Lithium-ion batteries generally include a positive electrode sheet, a negative electrode sheet and an electrolyte, the positive electrode sheet includes a positive electrode slurry and a positive electrode metal collector, and the negative electrode sheet includes a negative electrode slurry and a negative electrode metal collector. Lithium-ion batteries using lithium cobaltate as the positive electrode material have the advant...

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 朱力强王守军余海导余育强
Owner MEIZHOU LIANGNENG NEW ENERGY SCI & TECHCO
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