Testing device for quantizing volume of gas produced in battery and testing method

Abstract

The invention relates to a testing device for quantizing volume of gas produced in a battery and a testing method. The testing device comprises a first water tank and a second water tank which containdeionized water respectively, wherein a tested battery is placed in the first water tank; the second water tank is arranged on a precision weighing instrument; a liquid injection hole of the tested battery is connected with a gas cylinder through a gas pipe; a glass raised head which is inclined towards the position below the outer side is arranged on the side wall of the first water tank and connected with the second water tank through a hose; water level of the deionized water in the first water tank is higher than the top of the tested battery and located at the glass raised head; an internal pressure sensor communicated with the tested battery is arranged on the tested battery, and the internal pressure sensor and the precision weighing instrument are both connected with a data recorder. According to the technical scheme of the device, a correlation equation of actual gas output of the battery, internal pressure value of the battery and battery shell volume change can be obtainedby multiple experiments, and therefore, actual gas output in the battery can be obtained by non-destructive reverse inference according to change of the battery volume.

Description

technical field [0001] The invention relates to a test device and a test method for quantifying the volume of gas produced inside a battery. Background technique [0002] At present, the increasingly severe environmental conditions have put forward higher requirements for power batteries. High energy density and long cruising range have put forward higher requirements for the long life of batteries. Battery failure is divided into failure of mechanical structural parts and failure of chemical components. Among them, the gas production inside the battery is the leading factor for the failure of mechanical structural parts. How to quantify the gas production and know the risk points of battery failure is one of the important issues currently facing. CN106289396A uses a sharp needle to pierce the explosion-proof valve of the battery to release and collect gas through a vacuum box to detect the internal gas volume of the battery; CN205920110U is connected to the battery liquid i...

AI Technical Summary

Problems solved by technology

CN106289396A uses a sharp needle to pierce the explosion-proof valve of the battery to release and collect gas through a vacuum box to detect the internal gas volume of the battery; CN205920110U is connected to the battery liquid injection hole through a gas pipeline, and the gas flows through the flow control meter to obtain its gas volume; above Both are destructive testing, and it is easy to have problems such as poor sealing and invalidation of test data.

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