Lithium-ion battery steel case and method for improving liquid injection efficiency of steel case

Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery steel case and a method for improving the liquid injection efficiency of the steel case. The lithium ion battery steel shell includes a steel shell body. A fixing ring is fixed on the upper side wall of the steel shell body. A connection cover is provided at the lower part of the fixing ring. The lower part of the connection cover extends to the steel shell body. In the lower part of the inner part, a plurality of vents are evenly arranged on the outer wall of the connecting cover, and a floating pad is set on the lower outer wall of the connecting cover. A sealing ring is provided on the outer wall of the opening of the steel shell body. An exhaust mechanism is provided in the sealing ring. One end of the exhaust mechanism is connected to the inside of the steel shell body, and the other end passes through the fixed ring, the sealing ring, and the side wall of the steel shell body to communicate with the outside. The exhaust mechanism of the present invention can be used to exhaust gas in real time during liquid injection. At the same time, the floating pad can move with the height of liquid injection to exhaust the air in the upper part and improve the air outlet efficiency.

Description

Technical field [0001] The patent of this invention relates to the technical field of lithium-ion batteries, specifically, to a lithium-ion battery steel case and a method for improving the liquid injection efficiency of the steel case. Background technique [0002] The improvement of energy density has always been one of the directions pursued by lithium-ion battery practitioners. High-nickel cathode materials and silicon anode materials are the only way to increase the energy density of lithium-ion batteries. Due to the characteristics of the positive high-nickel material and the silicon negative material, the compaction thickness of the positive and negative electrodes is relatively thick, resulting in a larger size of the battery core and a smaller gap between the battery core and the steel shell, making it difficult to fill the liquid. , reduce production efficiency. Moreover, the longer the injection time, the easier it is to introduce moisture. In addition, the high...

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Problems solved by technology

[0006] The object of the present invention is to provide a lithium ion battery steel case, which can be exhausted in real time during liquid injection through the exhaust mechanism provided, thereby increasing the liquid injection efficiency. The pressure of the air can be exhausted to improve the gas output efficiency, aiming to solve the problem of the introduction of moisture caused by the low efficiency of liquid injection in the prior art. The gas generated in the subsequent formation cannot be discharged, which will become a constraint for high-nickel positive electrode materials and silicon negative electrode materials. A major pain point in the rapid promotion and application of cylindrical batteries

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