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Preparation method of cylindrical battery free of tab welding

A tab welding and cylindrical technology, which is applied in the preparation field of cylindrical battery without tab welding, can solve the problems of poor welding effect, loss of space capacity, high internal resistance of the battery, etc., so as to improve energy density and use safety, and reduce labor costs. Step, the effect of improving production efficiency

Active Publication Date: 2016-03-30
DONGGUAN CHUANGMING BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method for welding cylindrical batteries without tabs, aiming to simultaneously solve the problem of high internal resistance of the battery caused by the use of tabs in the prior art, especially when the structure of super-welded multi-tabs is used. A series of problems with poor performance and loss of space capacity

Method used

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  • Preparation method of cylindrical battery free of tab welding
  • Preparation method of cylindrical battery free of tab welding
  • Preparation method of cylindrical battery free of tab welding

Examples

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preparation example Construction

[0018] An embodiment of the present invention provides a preparation method for welding a cylindrical battery without tabs, including the following steps:

[0019] S01. The positive and negative electrode substrates are longitudinally intermittently coated, and after cutting, the positive and negative electrodes with blank spaces on one side are obtained respectively;

[0020] S02. Laminate the positive electrode sheet, diaphragm, and negative electrode sheet in sequence, and then wind them into a core, and place the ends of the positive and negative electrode sheets with blank space on the outer sides of the two long sides of the separator, and the edge of the separator is exposed. There is blank space;

[0021] S03. Flatten the exposed blank foil to form a flat and smooth positive and negative foil table;

[0022] S04. Use a negative electrode collector with a boss to pressure-place it on the negative electrode foil table of the core, and perform laser welding to form a neg...

Embodiment 1

[0045] A preparation method for welding a cylindrical battery without tabs, comprising the following steps:

[0046] S11. Apply longitudinal intermittent coating to the base material of the positive and negative electrodes, and after cutting, respectively obtain the positive and negative electrodes with blank spaces on one side;

[0047] S12. Laminate the positive electrode sheet, the diaphragm, and the negative electrode sheet in sequence, and then wind them into a core, and place the ends of the positive and negative electrode sheets with blank space on the outer sides of the two long sides of the diaphragm, and the edge of the diaphragm is exposed. There is blank space;

[0048] S13. Flatten the exposed blank foil to form a flat and smooth positive and negative foil table;

[0049] S14. The negative electrode uses a circular Ni sheet with a boss in the center, the specification is Φ16*0.1mm, and the boss is placed on the Cu foil table of the negative electrode for laser we...

Embodiment 2

[0051] A preparation method for welding a cylindrical battery without tabs, comprising the following steps:

[0052] S11. Apply longitudinal intermittent coating to the base material of the positive and negative electrodes, and after cutting, respectively obtain the positive and negative electrodes with blank spaces on one side;

[0053] S12. Laminate the positive electrode sheet, the diaphragm, and the negative electrode sheet in sequence, and then wind them into a core, and place the ends of the positive and negative electrode sheets with blank space on the outer sides of the two long sides of the diaphragm, and the edge of the diaphragm is exposed. There is blank space;

[0054] S13. Flatten the exposed blank foil to form a flat and smooth positive and negative foil table;

[0055] S14. The negative electrode uses a circular Ni sheet with a boss in the center, the specification is Φ16*0.1mm, and the boss is placed on the Cu foil table of the negative electrode for laser we...

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Abstract

The invention is applicable to the field of cylindrical batteries, and provides a preparation method of a cylindrical battery free of tab welding. The method comprises the steps as follows: a positive plate base material and a negative plate base material are coated in a longitudinal intermittent manner; a positive plate and a negative plate are respectively obtained after slitting; a blank is formed in one side of each of the positive plate and the negative plate; the positive plate, a diaphragm and the negative plate are wound into a roll core after being sequentially stacked; one end, with the blank, of the positive plate and one end, with the bank, of the negative plate are arranged at the outer sides of two long sides of the diaphragm; the blanks are exposed on the edges of the diaphragm; foils with the exposed blanks are flattened to form flat and smooth positive and negative foil table boards; a negative current collector with a boss is pressed on the negative foil table board of the roll core and laser welding is carried out to form a negative welding spot; and a positive current collector with a center hole is pressed on a positive foil table board of the roll core and laser welding is carried out to form a positive welding spot.

Description

technical field [0001] The invention belongs to the field of cylindrical batteries, and in particular relates to a preparation method for welding cylindrical batteries without tabs. Background technique [0002] For traditional cylindrical batteries - such as 18650 cylindrical lithium-ion batteries, the positive and negative electrodes mostly adopt a single tab design, no matter how the position of the tab is set, the size of the tab, the metal foil of the tab and the pole piece, and the steel shell And the welding state between the caps is an important factor affecting the physical internal resistance of the battery. Poor welding may even cause the overall internal resistance of the battery to increase to several hundred milliohms. At present, even some cylindrical power products with a multi-tab design similar to soft-packed lithium batteries can only reduce the internal resistance to about 10mΩ. The setting of multi-pole lugs (more than two pole lugs) structure will brin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/0525H01M2/26H01M50/566
CPCH01M10/0525H01M10/0587H01M50/531Y02E60/10Y02P70/50
Inventor 宇妍赵悠曼程建良
Owner DONGGUAN CHUANGMING BATTERY TECH
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