Square lithium ion battery terminal post anti-rotation device

Abstract

The invention relates to a square lithium ion battery terminal post anti-rotation device, comprising an anode terminal post and a cathode terminal post respectively consisting of an anode terminal post body, a cathode terminal post body, an anode terminal post table and a cathode terminal post table. The anode terminal post body and the cathode terminal post body respectively consist of an upper part and a lower part, the flat anode terminal post table and the flat cathode terminal post table are arranged between the upper part and the lower part of the anode terminal post body and the cathode terminal post body. The device also comprises a bracket forming embedded fit with the anode terminal post and the cathode terminal post, a first through hole and a second through hole respectively fit for the peripheral outlines of the anode terminal post table and the cathode terminal post table are cut on the bracket, the peripheral outlines of the two tables are both non-circular and are composed of at least two sections of edges with different curvatures. By arranging the bracket, the device assembles the anode terminal post and the cathode terminal post together with the bracket as a whole so as to interlock the two terminal posts with the bracket deadly, thus being capable of effectively preventing the rotation of the terminal posts. Simultaneously, the device is simple in structure, easy in assembly and low in cost.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to an anti-rotation device for a pole of a square lithium ion battery. Background technique [0002] With the application of capacity-type and power-type lithium-ion batteries, the lead-out tabs of the square shell can no longer meet the needs of high-current discharge of lithium-ion batteries, and the pole-type design has begun to replace the tab-lead-out design. During the manufacture and use of pole-type lithium-ion batteries, due to repeated twisting of the nut, it is easy to cause the pole to loosen and affect the sealing effect of the battery. In severe cases, the tabs and pole pieces on the pole piece will break and the battery life will be shortened. Or a short circuit inside the battery. [0003] The existing methods for preventing the rotation of the pole include: the first method, the pole and the cover plate are cast together, and the insulation casting is performed between the ...

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Problems solved by technology

[0004] There are a lot of problems in the above four methods: the first one, because it is a one-time casting molding, the cost is too high, and there is no such structure found in the domestic civilian lithium-ion battery; the second one, because the anti-rotation part and the cover plate need to be welded Together, it is difficult to assemble, and the sealing effect of the battery pole will not be very good. The anti-rotation part needs to be matched with the inner platform of the pole. The anti-rotation part needs to be made into a funnel shape. Civilian products have not yet found this structure, and the cost is relatively high; the third type, because the cover plate needs to be concave, and an insulating pad must be added between the cover plate and the pole, in order to achieve sealing and anti-rotation, the cover plate must be thickened. The insulation pad material must have high fatigue resistance, which can achieve good results under the premise of increasing cost and quality. However, the domestic products of this design have thin cover plates and insulation pads. Due to the use of small batteries, the required The rotational moment is small, and this design is mostly used on small batteries. Because the large battery requires a large rotational moment when in use, this design cannot achieve the desired effect; the fourth type, due to the strength of the plastic parts, the plastic parts The mass is large, and the effective thickness of the pole self-locking platform needs to be thickened, resulting in an increase in the mass of the pole and a decrease in the utilization rate of the battery cavity. Some domestic manufacturers are using this design, but the effect is not very unsatisfactory.

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