Rapid detection device and detection method for reliability of lithium battery current cut-off device

Abstract

The invention relates to a rapid detection device and detection method for the reliability of a lithium battery current cut-off device, and the device comprises a pedestal, a vertical column, a lead screw, a stepping motor, a workbench, a main shaft box, a laser range finder, and a drill bit suite. The stepping motor is in transmission fit with the lead screw. The laser range finder obtains vertical distance information and corresponding position information between the spindle box and the workbench; and the drill bit suite is detachably connected into the drill bit interface, so that punching on the top cover of the battery sample is realized, the current cut-off device is triggered in a programmed physical mode, and the reliability of the current cut-off device is detected under the condition that no gas is generated in the battery. Compared with the prior art, by designing the special drilling device, the reliability of the current cut-off device (CID) of the cylindrical lithium battery finished product can be directly detected, the use is rapid, convenient, simple and efficient, and the device is suitable for second-party and third-party quality inspection and detection of the cylindrical lithium battery product.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery safety evaluation, in particular to a rapid detection device and a detection method for the reliability of a lithium battery current cut-off device. Background technique [0002] Lithium battery safety devices are generally integrated in the cap structure of the battery cell, including thermistor (Positive Temperature Coefficient), current interrupt device (Current Interrupt Device), safety valve (Safety Vent, also known as pressure relief valve), etc. When the lithium battery heats up and gas is generated inside, the welding part can be pulled off by the action of the valve plate, and the circuit is disconnected. If the internal pressure of the battery continues to rise, the valve plate will rupture, and the gas will be released to prevent the lithium battery core from being damaged due to internal pressure. Explosive too high. [0003] The current cut-off device is a protective func...

AI Technical Summary

Problems solved by technology

However, in this technical solution, the handle is used to push the threaded drill rod to drill into the battery, which requires high professionalism of the operator. If the drill is too deep, it may drill through the battery diaphragm and cause an internal short circuit, which may cause fire or explosion. If the drill is too shallow, it may not Drilling through the battery case will not ventilate the inside of the battery, which poses a certain safety risk

Additionally, manual operations are slow and test results are less consistent

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