Top cover module of secondary battery and secondary battery

Abstract

The present invention provides a top cover module for a secondary battery and a secondary battery. The top cover module comprises a top cover plate, a fixing member, a connecting member and an electrode terminal, wherein the top cover plate has an electrode lead-out hole; the fixing member is fixed to the top cover plate by the connecting member, the fixing member is provided with a weak portion,and the weak portion is adjacent to a center line of the top cover plate in the width direction; the electrode terminal includes a terminal plate, the outer peripheral surface of the terminal plate isat least partially surrounded by the fixing member to fix the electrode terminal to the fixing member, and the terminal plate is located at one side of the top cover plate and covers the electrode lead-out hole. The top cover module for the secondary battery and the secondary battery can solve the problem that a lot of gases are generated in the housing of the secondary battery to allow the top cover plate to be deformed to cause the detaching of the pole and cause gas leakage and liquid leakage of the secondary battery, simplify the structure of the electrode terminal to reduce the occupation of the top cover module in the internal space of the secondary battery so as to improve the energy density of the secondary battery.

Description

technical field [0001] The invention relates to the technical field of energy storage devices, in particular to a top cover assembly of a secondary battery and the secondary battery. Background technique [0002] New energy vehicles are being widely promoted at home and around the world, but there are still many things to improve in order to completely replace fuel vehicles. For example, the mileage of the car is small, the cost of the battery pack is high, and the reliability of the battery pack needs to be further resolved. [0003] At present, the power battery generally adopts a square hard shell structure. The power battery shell includes a shell and a top cover assembly. The power battery shell provides a closed space to accommodate the electrode assembly and electrolyte. The electric energy of the electrode assembly passes through the pole of the top cover assembly. Lead out from the confined space to the outside of the confined space. [0004] In the existing top c...

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Problems solved by technology

However, when a large amount of gas is generated inside the casing of the secondary battery, the top cover plate is deformed into an arched shape (because the width direction both sides edges of the top cover plate are welded to the casing, the deformation of the width direction both sides edges is small, and the width direction The deformation in the middle area of ​​the direction is large, so the top cover will form an arch), due to the high rigidity of the fixing part, it cannot form an arch with the top cover, so the gap between the two sides of the width direction of the top cover and the fixing part will be made The gap increases (even the connecting piece will be broken), making it impossible to press the seal between the terminal board and the top cover board, which will cause air leakage and liquid leakage of the secondary battery

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