Method for detecting battery internal pressure and battery internal pressure detection device

Abstract

The invention relates to an internal pressure detecting method of a battery and an internal pressure detecting device of a battery. The internal pressure detecting method of a battery comprises the following steps: setting an inner air filled elastic sealer in the cavity of the battery; obtaining the outer diameter of the elastic sealer by means of the X ray transmission test after the precharge formation of the battery is finished; calculating the volume; and calculating and obtaining the gas pressure in the elastic sealer by means of the gas equation PV = nRT, and the gas pressure in the elastic sealer is the internal pressure value of the battery. The internal pressure detecting device includes an elastic sealer arranged in the inner cavity of the battery; wherein the elastic sealer comprises an elastic wall and a cavity formed by the sealing and surrounding of the elastic wall; and the air is filled in the cavity to form the same pressure value as the pressure in the inner cavity of the battery. By means of the invention, the internal gas pressure in any sealed battery can be accurately detected, the detection is convenient, and the requirement of large-scale mass production can be met, therefore, the electrochemical performance, the safety performance and the consistency of lithium ion batteries can be effectively evaluated and screened finally.

Description

technical field [0001] The invention relates to the field of electric vehicle power battery manufacturing, in particular to a method for detecting the internal pressure of the battery and a detection device for the internal pressure of the battery. Background technique [0002] Lithium-ion batteries have a history of nearly 20 years from the actual industrialization to the present. As a new type of green, high-energy and environmentally friendly power battery, it has many advantages such as high energy density, long service life, non-toxic environmental protection, and convenient recycling. . At present, lithium-ion batteries are the best energy storage devices, and their advantages are much higher than those of lead-acid and nickel-metal hydride batteries, and they have been widely used in various fields, especially in the recent and future new energy vehicles. and development are on an almost linear upward trend. [0003] Lithium-ion batteries can be divided into several...

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Problems solved by technology

[0006] The invention mainly solves the technical problem that it is difficult to test the internal pressure of the battery. The original test method cannot accurately detect the internal pressure of the battery or is destructive, and cannot be applied to large-scale mass production; it provides a method for detecting the internal pressure of the battery. The pressure method and the internal pressure detection device of the battery can easily realize the detection of the internal pressure of the battery, and the detection is accurate to meet the needs of large-scale mass production

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