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Soft package power lithium ion battery cathode pole ear structure and preparation method

A lithium-ion battery and tab technology, applied in structural parts, battery pack parts, circuits, etc., can solve problems such as affecting the life of power batteries, chronic corrosion of tabs, easy over-welding or virtual welding, etc. Industrial production, improved yield and consistency, improved service life

Active Publication Date: 2013-06-26
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the negative electrode of the power pouch battery is currently exported to copper foil, and ultrasonic welding is used at the same time, direct welding of copper nickel-plated strips and copper nickel-plated tin strips to copper foil will cause the following problems: firstly, under ultrasonic conditions, metal copper and metal There is a difference in the melting point of nickel or nickel-tin alloys, and it is easy to over-solder or false-solder (insufficient welding) during the production process; secondly, after the battery is heat-sealed, due to the presence of an electrolyte containing conductive ions, the metal copper and metal nickel at the position of the tab glue It is easy to form a partial "primary battery", leading to chronic corrosion and leakage of the tabs, which greatly affects the life of the power battery
Its disadvantage is that there is a difference in melting point between metal copper and metal nickel or nickel-tin alloy under ultrasonic conditions, and it is easy to over-weld or virtual weld (insufficient welding) in the production process; when the battery is heat-sealed due to the presence of electrolytic The metal copper and metal nickel under the position of the tab glue is easy to form a local "primary battery", resulting in chronic corrosion and leakage of the tab, which greatly affects the life of the power battery

Method used

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  • Soft package power lithium ion battery cathode pole ear structure and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Heat the copper base material with a purity of 99.995% to 930°C, keep it warm for 6 minutes, then pickle it with HF with a concentration of 6% by mass, and roll it after baking. The thickness of the roll is 20 microns.

[0030] In the second step, the copper strip made in the first step is divided into strips with a strip width of 80 mm, and then the cut edge is deburred, and then the deburred copper strip is DC electroplated, and the coating is made of metallic nickel with a width of 40 mm. The thickness is 5 microns, and the deburring copper strip is partially nickel-plated to make a strip-shaped coated copper strip.

[0031] The 3rd step cleans the strip-shaped coated copper strip made in the second step, and the cleaning is at first to adopt the NaOH lye cleaning of 5% in mass percentage concentration, then neutralize with the HF acid solution of 5% in mass percentage concentration, and finally It is deionized water cleaning, ultrasonic vibration during the clean...

Embodiment 2

[0036] The first step is to heat the copper substrate with a purity of 99.993% to 940°C and keep it warm for 12 minutes, then pickle it with HF with a concentration of 7% by mass, and roll it after baking. The thickness of the roll is 15 microns.

[0037] In the second step, the copper strip made in the first step is divided into strips with a strip width of 75mm, and then the cut edge is deburred, and then the deburred copper strip is DC electroplated, and the coating is made of nickel-tin alloy with a width of 35mm. , with a thickness of 3 microns, and partially nickel-plate the deburring copper strip to form a strip-shaped coated copper strip.

[0038] The third step is to clean the strip-shaped nickel-tin alloy copper strip made in the second step. At first, the cleaning is to use a mass percent concentration of 6% NaOH lye to clean, and then use a mass percent concentration of 7% HF acid to neutralize , and finally deionized water cleaning, ultrasonic vibration during the...

Embodiment 3

[0043] The first step is to heat the copper substrate with a purity of 99.990% to 945°C and keep it warm for 8 minutes, then pickle it with HF with a concentration of 6% by mass, and roll it after baking. The thickness of the roll is 10 microns.

[0044] In the second step, the copper strip made in the first step is divided into strips with a strip width of 45 mm, and then the cut edge is deburred, and then the deburred copper strip is subjected to chemical plating, and the coating is metallic nickel with a width of 26 mm. , The thickness of the coating is 3 microns, and the deburring copper strip is partially nickel-plated to form a strip-shaped coated copper strip.

[0045]The 3rd step cleans the strip-shaped coated copper strip made in the second step, and the cleaning is at first to adopt the NaOH lye cleaning that the mass percent concentration is 6%, then neutralize with the HF acid solution that the mass percent concentration is 7.5%, and finally It is deionized water c...

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Abstract

The invention discloses a soft package power lithium ion battery cathode pole ear structure and a preparation method, a pole ear base material is a copper strip with copper content of more than 99.99%; the pole ear is locally coated, and a pole ear glue with a multilayer structure is coated on an uncoated part of the pole ear. The prepared cathode pole ear can avoid the hidden trouble that a chronic corrosion leakage liquid is generated at a bimetallic composite position, the yield and consistency of cell production can be further enhanced, and the usage life of the cell can be simultaneously increased. The preparation method of the invention enables convenient operation, can realize large-scale production, and has the advantages of environmental protection and strong feasibility.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery production, in particular to a negative electrode tab structure for a soft pack power lithium-ion secondary battery and a preparation method thereof. Background technique [0002] In recent years, due to the pressure of environmental pollution and energy shortage, countries are forced to find new green, environmentally friendly and sustainable energy sources. The green, high-energy and environmentally friendly lithium-ion battery that appeared in the 1990s has become one of the most eye-catching power sources due to its high energy density, long cycle life, and high operating voltage. As one of the core materials of the power battery, the tab has an important impact on the battery life, internal resistance and other characteristics. The tab with excellent performance plays an important role in improving the comprehensive performance of the power battery life. [0003] Since the negati...

Claims

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Application Information

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IPC IPC(8): H01M2/26C25D5/02C25D7/06
CPCY02E60/10
Inventor 李凡群朱修锋陈军
Owner WANXIANG 123 CO LTD
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