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Bottom welding effect verification method and device for negative tab of cylindrical battery

A technology of battery negative electrode and inspection method, which is applied in the direction of cylindrical shell battery/battery, measuring device, battery assembly machine, etc., can solve problems such as battery leakage inspection, and achieve the effect of reducing unqualified products and improving production quality

Inactive Publication Date: 2018-03-30
DONGGUAN CHUANGMING BATTERY TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for inspecting the welding effect of the bottom of the negative electrode of the cylindrical battery, so as to solve the technical problem of the battery missing due to random inspection to determine the welding effect in the prior art

Method used

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  • Bottom welding effect verification method and device for negative tab of cylindrical battery
  • Bottom welding effect verification method and device for negative tab of cylindrical battery
  • Bottom welding effect verification method and device for negative tab of cylindrical battery

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specific Embodiment approach

[0047] Further, see image 3 , as a specific implementation of the method for testing the welding effect of the bottom ear of the cylindrical battery negative electrode provided by the present invention, the measured resistance value R=R1+R2+R3+R4+R5+R6+R7+R8;

[0048]In the formula, R1 is the resistance of the welding head, R2 is the contact resistance between the welding needle 2 and the welding head, R3 is the resistance of the welding needle, R4 is the resistance between the welding needle 2 and the negative ear 3, R5 is the contact resistance between the negative ear 3 and the steel The resistance after the shell 4 is fused, R6 is the resistance of the steel shell, R7 is the contact resistance between the steel shell 4 and the soldering station 5, and R8 is the resistance of the soldering station;

[0049] In the formula, R1, R2, R3, R4, R6, R7, R8 are fixed values.

[0050] The method for testing the bottom welding effect of the negative pole ear of the cylindrical batt...

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Abstract

The invention provides a bottom welding effect verification method and device for a negative tab of a cylindrical battery, and belongs to the technical field of battery fabrication. The bottom weldingeffect verification method comprises the steps of inserting a welding needle, pressing a welding needle, performing welding and energization, upwards moving a welding head and pulling out the weldingneedle; setting resistance test after welding and energization and before welding head upwards moving; and repeating welding and energization in the resistance test when an actually-measured resistance value R is more than or equal to Rm, performing secondary welding, and upwards moving the welding head to complete welding when the actually-measured resistance value R is smaller than Rm. By the bottom welding effect verification method for the negative tab of the cylindrical battery, a bottom welding effect of the negative tab of each battery can be verified in real time, an unqualified product caused by detection leakage is prevented from entering a next process, and the production quality of a battery product is improved.

Description

technical field [0001] The invention belongs to the technical field of battery production, and more specifically relates to a method and a device for testing the effect of bottom ear welding of a negative pole of a cylindrical battery. Background technique [0002] Generally, in the structure of a cylindrical lithium-ion battery, the negative end is a steel shell, and the positive end is a cover plate. The negative electrode of the inner core of the battery relies on the welding between the negative tab and the steel shell to achieve internal and external communication. The welding of the negative tab and the steel shell is realized by resistance welding. Among them, the welding of the negative tab is divided into the welding of the tab on the pole piece and the welding of the tab and the steel shell. The welding between them is generally called bottom welding. [0003] The traditional negative tab welding process can be briefly described as: rolling the core into the shell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/22H01M10/058G01R27/02H01M50/528
CPCH01M10/0409H01M10/0422H01M10/058G01R27/02H01M50/528Y02E60/10Y02P70/50
Inventor 周崇旺杨俊赵悠曼乔亚非
Owner DONGGUAN CHUANGMING BATTERY TECH
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