Device and method for measuring flatness of lithium ion soft package battery

Abstract

The invention provides a flatness measuring device for a lithium ion soft package battery. The flatness measuring device comprises a matrix array, a base (3) and an acquisition card (4), wherein the matrix array consists of a plurality of same measuring rods (2); the measuring rod (2) is in a vertical state and comprises a measuring probe (21), a supporting rod (22) and a signal line (23); the upper end and the lower end of the signal line (23) are electrically connected with the acquisition card (4) respectively; the measuring probe (21) is made of piezoelectric ceramic, and the top end of the measuring probe is a horizontal plane. The invention also provides a method for measuring flatness of the lithium ion soft package battery, which comprises the following steps of flatly placing the measured lithium ion soft package battery on the matrix array consisting of the measuring rods (2), reading the pressure values measured by the measuring rods (2) to form a pressure value matrix, and calculating and outputting a flatness coefficient. The measuring device is simple in structure, easy to manufacture and high in precision, and the corresponding measuring method is easy and convenient to operate, scientific, reasonable and good in stability.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a flatness measuring device and method for lithium-ion soft pack batteries. Background technique [0002] Lithium-ion batteries are widely used in various sectors of the national economy and residents' lives. Among them, lithium-ion soft-pack batteries have attracted more and more attention due to their various advantages such as good safety, light weight, large capacity, low internal resistance, and flexible customization. Lithium-ion soft-pack batteries are usually packaged in aluminum-plastic film in terms of structure, and their products require that the battery surface be flat and free of holes. For example, Chinese patent CN201910208796.2 discloses a method for improving the surface flatness of lithium batteries. If there are factors such as design defects, poor production process or improper use, the flatness of the lithium-ion pouch battery plane is likely to decrea...

AI Technical Summary

Problems solved by technology

However, in the known technical occasions, the surface smoothness of lithium-ion pouch batteries is usually detected by manual visual inspection or touch, which relies heavily on manual subjective judgment and cannot give objective, accurate and quantitative detection results

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