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Surface treatment method of nickel metal strip for lithium-ion battery negative electrode ear

A lithium-ion battery and surface treatment technology, applied in battery pack parts, metal material coating process, circuits, etc., can solve the problems of complex battery manufacturing process, increased process, poor solderability, etc., and achieve excellent electrolyte resistance performance. , Good soldering performance, the effect of reducing production cost

Inactive Publication Date: 2013-07-10
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solderability of the nickel tabs of the existing polymer lithium-ion batteries is not ideal, which makes the battery manufacturing process complicated
The usual practice is to use sandpaper to polish the soldering place before soldering, which not only increases the process, reduces production efficiency, but also leads to increased costs
Chinese patent (application number 200910190249.2) discloses a polymer battery tab and its surface treatment method, which uses ammonium bifluoride, chromium oxide, boric acid, and sodium phosphate to treat the tab, and the resulting tab has excellent electrolyte resistance , but the problem of poor solderability has not been solved

Method used

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  • Surface treatment method of nickel metal strip for lithium-ion battery negative electrode ear
  • Surface treatment method of nickel metal strip for lithium-ion battery negative electrode ear

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The preparation of treatment liquid: water or deionized water is solvent, and the first step treatment liquid is a, and the second step treatment liquid is f;

[0062] Approach:

[0063] (1) Remove the grease on the surface of the nickel strip and clean it with tap water;

[0064] (2) Immerse the nickel strip treated in (1) in the first step treatment solution at 40°C for 6 minutes, and clean it with tap water;

[0065] (3) Immerse the nickel strip treated in (2) in the second-step treatment solution at 40°C for 8 minutes, and clean it with tap water;

[0066] (4) The nickel strip treated in (3) is heated and dried at 80°C.

Embodiment 2

[0068] The preparation of treatment liquid: the first step treatment liquid is b, and the second step treatment liquid is g;

[0069] Approach:

[0070] (1) Remove the grease on the surface of the nickel strip and clean it with tap water;

[0071] (2) Immerse the nickel strip treated in (1) in the first step treatment solution at 40°C for 6 minutes, and clean it with tap water;

[0072] (3) Immerse the nickel strip treated in (2) in the second-step treatment solution at 40°C for 8 minutes, and clean it with tap water;

[0073] (4) The nickel strip treated in (3) is heated and dried at 80°C.

Embodiment 3

[0075] The preparation of treatment liquid: the first step treatment liquid is c, and the second step treatment liquid is h;

[0076] Approach:

[0077] (1) Remove the grease from the nickel strip on the surface and clean it with tap water;

[0078] (2) Immerse the nickel strip treated in (1) in the first step treatment solution at 40°C for 6 minutes, and clean it with tap water;

[0079] (3) Immerse the nickel strip treated in (2) in the second-step treatment solution at 40°C for 8 minutes, and clean it with tap water;

[0080] (4) The nickel strip treated in (3) is heated and dried at 80°C.

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Abstract

The present invention discloses a surface treatment method of a nickel metal strip for a lithium-ion battery negative electrode ear. The method includes two steps. A treatment liquid in a first step includes at least a hexavalent chromium compound, a fluorine compound, and a phosphorus compound. A treatment liquid in a second step includes at least organic acid, inorganic acid, and a fluorine compound. A chemical conversion film is formed by heating and drying after applying the treatment liquid on the surface of the nickel metal strip. The nickel metal strip treated by the method of the present invention after hot pressing with an ear adhesive has excellent electrolyte resistance property. The nickel metal strip is directly immersed in the electrolyte at 85 DEG C for 4.5 hours. The bonding strength is almost unchanged. Meanwhile, the nickel metal strip after treatment still has good soldering properties, and can be directly soldered on the surface thereof. The metal nickel strip is used for the production of lithium ion battery ears. The production process can be simplified. The cost is reduced.

Description

technical field [0001] The invention relates to the surface treatment of nickel metal strips of lithium-ion batteries. The treated nickel metal strips not only have excellent solderability, but also have excellent electrolyte resistance after being bonded with tab glue by heat and pressure, and can be used in production Lithium-ion batteries, especially the negative tabs of polymer lithium-ion batteries. Background technique [0002] Lithium-ion battery is a kind of rechargeable battery. Due to its high working voltage, long cycle life, high specific energy, no memory effect, and small self-discharge, it is widely used in mobile phones, notebook computers, cameras and other digital products and new energy sources. Electric vehicles and other electronic equipment and devices. [0003] Polymer lithium-ion batteries use solid polymer electrolytes instead of liquid electrolytes. This polymer can be "dry" or "colloidal". At present, most of them use colloidal polymer electrolyte...

Claims

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Application Information

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IPC IPC(8): C23C22/38C23C22/34C23C22/36C23C22/46C23C22/47H01M2/26
CPCY02E60/10
Inventor 徐世爱梁昌盛徐立球
Owner EAST CHINA UNIV OF SCI & TECH
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