A measuring device and measuring method for the bulging degree of a square lithium-ion battery

Abstract

The invention provides a measuring device for the bulging degree of a square lithium ion battery, comprising an open cylinder (1), a disk (2), a rotating shaft (3), a rotating motor (4) and a slewing support bearing (5), the The rotating motor (4) is connected to the center of the bottom surface of the disk (2) through the rotating shaft (3) and can drive the disk (2) to rotate; The motor (4) rotates at a fixed speed for a certain period of time, observe and record the number of rotations of the measured square lithium-ion battery built in the center of the top surface of the disc (2) during this period of time, and then calculate the bulge degree coefficient of the battery. The measuring device provided by the invention is simple in structure, stable in performance and easy to manufacture, and the corresponding measuring method is easy to operate, scientific and reasonable, and has good stability.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a measuring device and method for measuring the bulging degree of a square lithium-ion battery. Background technique [0002] Lithium-ion batteries have been widely used due to their high energy and power densities and moderate cost. Among them, prismatic lithium-ion batteries are widely used in many fields such as digital products, energy storage systems and electric vehicles due to their compact space, easy manufacturing and grouping. Due to design and manufacturing defects, overcharge and overdischarge, and thermal abuse of lithium-ion batteries, it is easy to cause the internal electrode material to expand or the electrolyte to decompose to produce gas, and then there is a "bulge" phenomenon that some areas of the shell protrude. When the lithium-ion battery has a more obvious bulging phenomenon, it is usually accompanied by a decline in battery performance, and even ser...

AI Technical Summary

Problems solved by technology

Due to design and manufacturing defects, overcharge and overdischarge, and thermal abuse of lithium-ion batteries, it is easy to cause the internal electrode material to expand or the electrolyte to decompose to produce gas, and then there is a "bulge" phenomenon in which some areas of the shell protrude.

When the lithium-ion battery has a more obvious bulging phenomenon, it is usually accompanied by a decline in battery performance, and even serious bulging may bring serious safety hazards. Therefore, it is necessary to accurately measure and evaluate the bulging degree of lithium-ion batteries.

In the currently known technical means, methods such as visual observation and size measurement are usually used to evaluate the bulging degree of lithium-ion batteries, and the naked eye observation method lacks objective and quantitative basis; and size measurement is not only time-consuming and laborious, but also the measurement results are consistent with the measurement personnel. The measurement position is closely related. When the lithium-ion battery has multiple bulges or bulges with irregular shapes, it is difficult to accurately evaluate the degree of bulge of the lithium-ion battery by the size measurement method.

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