Method for Measuring Tab Flatness Using a Flatness Measuring Device

Abstract

The invention discloses a device for measuring the planeness of a pole lug. The device comprises a platform, a battery fixing plate and a digital display dial gauge, wherein the platform is supported by upright posts; the battery fixing plate can be driven to move up and down in the manner of being relative to the platform; the digital display dial gauge is fixedly arranged above the platform; the battery fixing plate comprises a horizontal loading plate, a U-shaped limit plate and a groove; the U-shaped limit plate is arranged on the horizontal loading plate; the groove is formed at the opening of the U-shaped limit plate and corresponds to a pole lug boss of a battery; the digital display dial gauge comprises a display screen, a measuring pole and a measuring block; the measuring pole is vertically arranged; the measuring block is fixedly connected with the measuring pole; and the width of the measuring block corresponds to the pole lug. The measuring device is simple in structure, convenient to operate and is particularly much lower than an optical instrument in cost, test is not affected by deflection, bending and warping of the pole lug, the accuracy is higher, and the speed is also much higher.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery production, in particular to a method for measuring the flatness of tabs using a flatness measuring device. Background technique [0002] After the polymer lithium-ion battery cell is manufactured, it needs to go through the packing process such as tab transfer welding before it can be made into a finished battery that can be directly used in the end. In the production process of polymer lithium-ion batteries, there are many charging and discharging processes and voltage internal resistance inspection items, which can only be realized by contacting the tabs with equipment tooling. These processes will inevitably affect the flatness of the tabs. The flatness of the tabs is very important for pack transfer welding. When the flatness of the tabs is too large, problems such as solder joints and welding explosions will occur during welding, which will directly lead to defective batteries. ...

AI Technical Summary

Problems solved by technology

However, these devices are often very expensive, generally tens of thousands to hundreds of thousands of dollars. It takes a long time, OMM equipment takes several minutes, and the test error is large. If the tab is slightly deflected or tilted, the test value will vary greatly, which is difficult. applied in production

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