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Welding method of lithium battery tab

A welding method and technology for lithium batteries, applied in secondary batteries, welding equipment, non-electric welding equipment, etc., can solve problems such as adverse effects of welding effects

Inactive Publication Date: 2021-08-17
昆山聚创新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on this, the present invention provides a welding method for lithium battery tabs to solve the adverse effects of tab oxidation and normal temperature welding on the welding effect

Method used

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  • Welding method of lithium battery tab
  • Welding method of lithium battery tab
  • Welding method of lithium battery tab

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment provides a lithium battery tab welding method, the specific steps are as follows:

[0054] 1) Ultrasonic cleaning: Use ethanol aqueous solution with a concentration of 5wt% at 40°C as the cleaning solution to clean the negative electrode ear to be welded. The cleaning time is 10 minutes and the frequency is 60khz. After ultrasonic cleaning, take out the negative electrode ear and proceed to the next step.

[0055] 2) Nitrogen heating: use nitrogen as a protective gas, and in a nitrogen atmosphere, heat the negative electrode ear after ultrasonic cleaning, and remove part of the cleaning solution through the thermal evaporation of circulating nitrogen gas. The heating temperature is 110 ° C, and the heating time is 2 hours. After the gas heating is completed, enter the next step;

[0056] 3) Vacuum heating: continue to heat the negative electrode ear in a vacuum environment through vacuum pumping, the vacuum degree is -93Kpa, the heating temperature is 11...

Embodiment 2

[0072] This embodiment provides a lithium battery tab welding method, the main difference from Embodiment 1 is that the process parameters of each step are different. Specific steps are as follows:

[0073] 1) Ultrasonic cleaning: Use ethanol aqueous solution with a concentration of 6wt% at 50°C as the cleaning solution to clean the negative electrode ear to be welded. The cleaning time is 8 minutes and the frequency is 60khz. After ultrasonic cleaning, take out the negative electrode ear and proceed to the next step.

[0074] 2) Nitrogen heating: use nitrogen as a protective gas, and in a nitrogen atmosphere, heat the negative electrode ear after ultrasonic cleaning, and remove part of the cleaning solution through the thermal evaporation of circulating nitrogen gas. The heating temperature is 120°C, and the heating time is 2.5h. After the shielding gas is heated, proceed to the next step;

[0075] 3) Vacuum heating: continue to heat the negative electrode ear in a vacuum en...

Embodiment 3

[0081] This embodiment provides a lithium battery tab welding method, the main difference from Embodiment 1 is that the process parameters of each step are different. Specific steps are as follows:

[0082] 1) Ultrasonic cleaning: Use ethylene glycol aqueous solution with a concentration of 8wt% at 60°C as the cleaning solution to clean the negative electrode tab to be welded. The cleaning time is 5 minutes and the frequency is 60khz. After ultrasonic cleaning, take out the negative electrode ear and proceed to the next step.

[0083] 2) Nitrogen heating: use nitrogen as a protective gas, and in a nitrogen atmosphere, heat the negative electrode ear after ultrasonic cleaning, and remove part of the cleaning solution through the thermal evaporation of circulating nitrogen gas. The heating temperature is 130 ° C, and the heating time is 3 hours. After the gas heating is completed, enter the next step;

[0084] 3) Vacuum heating: continue to heat the negative electrode ear in a ...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a welding method of a lithium battery tab. The welding method of the lithium battery tab comprises the following steps: carrying out ultrasonic cleaning on a tab to be welded, taking out the tab, heating to remove a cleaning solution, and cooling; carrying out preheating on the cooled tab; and carrying out ultrasonic welding on the preheated tab and a battery cell to be welded. By the adoption of the welding method, the surface oxidation state of the tab does not need to be measured and controlled, adverse effects of surface oxides of the tab on follow-up welding can be prevented, under the condition of the same welding parameters, the ultrasonic welding strength can be improved, too large welding energy can be effectively avoided, the service life of a welding head and the service life of a base are prolonged, and cost is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a welding method for tabs of lithium batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and low self-discharge rate. The lithium battery industry has developed rapidly in recent years. At present, lithium-ion batteries are mainly divided into three categories, namely square, cylindrical, and soft packs; among them, the shells of square and cylindrical shells are mainly made of aluminum alloy, stainless steel and other hard shells, while the shells of soft packs are made of aluminum-plastic film. ; Soft-pack lithium batteries have the advantages of good safety performance, large capacity, and small internal resistance. In terms of performance, soft-pack batteries have more comprehensive advantages and have broad application prospects in the future. [0003] In the production process of flexible...

Claims

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Application Information

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IPC IPC(8): B23K20/10B23K20/24H01M50/528H01M50/536H01M10/0525
CPCB23K20/10B23K20/24H01M10/0525Y02E60/10
Inventor 黎帆伍超夏稳孙晓辉
Owner 昆山聚创新能源科技有限公司