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Negative plate assembly, battery cell, preparation method of battery cell and laminated battery

A technology of negative electrode sheets and components, applied in the field of batteries, can solve the problems of thermal runaway of cells, large use safety, short circuit of lithium batteries, etc., and achieve the effect of reducing thermal runaway and improving use safety.

Pending Publication Date: 2022-03-25
FULLYMAX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium batteries have the advantages of high energy density, good cycle performance and long service life, and are widely used in products such as electric equipment, electrical appliances and smart machines. However, there is a serious safety problem in lithium batteries, that is, lithium batteries exist Internal short circuit causes the thermal runaway problem of lithium battery cell, especially the electrochemical reaction continuously occurs inside the lithium battery cell, and the occurrence of electrochemical reaction is also accompanied by heat release, in which the temperature at the tab position rises The most serious problem is that during the preparation process of lithium batteries, the tabs are easily broken due to external interference. If part of the tabs breaks, a sharp oxidation-reduction reaction will occur inside the lithium battery cell, resulting in a rapid temperature rise. The rise further exacerbates the problem of thermal runaway of lithium batteries, which poses a greater potential safety hazard

Method used

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  • Negative plate assembly, battery cell, preparation method of battery cell and laminated battery
  • Negative plate assembly, battery cell, preparation method of battery cell and laminated battery
  • Negative plate assembly, battery cell, preparation method of battery cell and laminated battery

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preparation example Construction

[0056]In one of the embodiments, the preparation method of the positive electrode active material comprises the following steps:

[0057] Put lithium salt, nickel salt, cobalt salt, manganese salt, vanadium salt and organic acid in deionized water for mixing and dissolving operation to obtain metal mixed solution;

[0058] Heating the mixed metal solution to obtain a metal sol;

[0059] Calcining the metal sol;

[0060] The calcined metal sol is pulverized to obtain a positive electrode active material.

[0061] The above-mentioned preparation method of the positive electrode active material uses an organic acid to dissolve lithium salts, nickel salts, cobalt salts, manganese salts and vanadium salts, ensuring the full mixing and dissolving of lithium salts, nickel salts, cobalt salts, manganese salts and vanadium salts , and then ensure the uniformity of mixing lithium salt, nickel salt, cobalt salt, manganese salt and vanadium salt, and then ensure the dispersion of each m...

Embodiment 1

[0107] At a temperature of 400°C, the copper foil is preheated to soften the copper foil, and then the softened copper foil is cut to obtain the negative tab and the auxiliary tab integrally formed on the copper foil Then, splicing and fixing the above-mentioned negative electrode sheets obtained by cutting, and coating the negative electrode slurry on the spliced ​​and fixed negative electrode sheets, followed by rolling drying, and then the separator, a plurality of the above-mentioned negative electrode sheets obtained and a plurality of positive pole pieces are alternately stacked one by one, so that the positive pole piece and the negative pole piece are separated by a diaphragm, and then the positive pole lug of the positive pole piece is welded, and the negative pole lug and the auxiliary pole lug of the negative pole piece are respectively welded to obtain a cell, and Carry out chemical conversion treatment on the battery core.

Embodiment 2

[0109] At a temperature of 500°C, the copper foil is preheated to soften the copper foil, and then the softened copper foil is cut to obtain the negative tab and the auxiliary tab integrally formed on the copper foil Then, splicing and fixing the above-mentioned negative electrode sheets obtained by cutting, and coating the negative electrode slurry on the spliced ​​and fixed negative electrode sheets, followed by rolling drying, and then the separator, a plurality of the above-mentioned negative electrode sheets obtained and a plurality of positive pole pieces are alternately stacked one by one, so that the positive pole piece and the negative pole piece are separated by a diaphragm, and then the positive pole lug of the positive pole piece is welded, and the negative pole lug and the auxiliary pole lug of the negative pole piece are respectively welded to obtain a cell, and Carry out chemical conversion treatment on the battery core.

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Abstract

The invention provides a negative plate assembly, a battery cell, a preparation method of the battery cell and a laminated battery. The negative plate assembly comprises a plurality of negative plates, each negative plate comprises a copper foil, a negative tab and an auxiliary tab, the negative tab and the corresponding auxiliary tab are connected with the corresponding copper foil, the negative tabs of the plurality of negative plates are connected in a laminated manner, and the auxiliary tabs of the plurality of negative plates are connected in a laminated manner. According to the negative plate assembly, thermal runaway in the lithium battery cell can be reduced, so that the use safety of the lithium battery is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a negative plate assembly, a battery cell and a preparation method thereof, and a stacked battery. Background technique [0002] Lithium batteries have the advantages of high energy density, good cycle performance and long service life, and are widely used in products such as electric equipment, electrical appliances and smart machines. However, there is a serious safety problem in lithium batteries, that is, lithium batteries exist Internal short circuit causes the thermal runaway problem of lithium battery cell, especially the electrochemical reaction continuously occurs inside the lithium battery cell, and the occurrence of electrochemical reaction is also accompanied by heat release, in which the temperature at the tab position rises The most serious problem is that during the preparation process of lithium batteries, the tabs are easily broken due to external interference....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M50/531H01M50/536H01M50/538H01M10/0525H01M10/0585
CPCH01M4/134H01M50/531H01M50/536H01M50/538H01M10/0525H01M10/0585H01M2004/027Y02E60/10Y02P70/50
Inventor 史金元邓健想刘长昊
Owner FULLYMAX BATTERY CO LTD
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