An airtightness detection device for a cylindrical cell

Abstract

The invention discloses an air tightness detecting device for a cylindrical cell. The air tightness detecting device comprises an air-pressure meter, a high-pressure air pipe connector, a base and an air inflation connector. The air inflation connector comprises a conical hollow threaded rod on the front portion and a feeding mechanism on the rail portion, the base is provided with an installation hole with the diameter being slightly larger than the diameter of the cell to be detected, a threaded hole allowing the conical hollow threaded rod to penetrate is formed in the side wall of the installation hole, the tail end of the air inflation connector is movably connected with the high-pressure air pipe connector, the high-pressure air pipe connector is in series connection with the air-pressure meter, and a liquid storage device is arranged on the upper portion of the base. According to the air tightness detecting device, the cell is inserted from the side face by the utilization of the conical hollow threaded rod so as to prevent the cell from flying away in the pressurizing process, a drilling air hole does not need to be arranged singly, propulsion control is accurate, a liquid storage bin and a bleeder valve which is arranged on one side of the installation hole are arranged on the base, liquid is directly filled into the liquid storage bin during air tightness detection, the application amount of the liquid is small, the liquid is prevented from being polluted by a destructive test, detection can be performed conveniently and rapidly without moving the whole air tightness detecting device into a water channel, and cost is reduced greatly.

Description

technical field [0001] The invention belongs to the technical field of battery air tightness detection, in particular to an air tightness detection device for a cylindrical battery cell. Background technique [0002] At present, in the production and manufacturing process of the battery, the sealing of the heat seal of the battery cover is not good, which will cause problems such as battery acid leakage and affect the quality of the battery; therefore, it is necessary to check the airtightness of the battery. The existing air-tightness detection method is usually to form a pressure difference inside and outside the battery, and use a pressure sensor to detect the change of the pressure difference to judge the air-tightness. This is the general principle of the air-tightness detection machine. However, in the practical operation of testing the airtightness of cylindrical cells and the opening pressure data of explosion-proof valves, it is generally used to add an O-ring at th...

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Problems solved by technology

Although it is easy to operate during detection, the electric core must be drilled before detection, which is easy to affect the internal physical and chemical properties, and an additional cylinder is required as a propulsion force during the detection process to ensure that the steel needle is inserted into the detection cell, and The gap between the steel needle and the reserved hole on the battery core is relatively large. If the outer diameter of the steel needle is larger than the reserved hole, it will be difficult to insert

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