Lithium-ion power battery

Abstract

The invention relates to a lithium-ion power battery which comprises a positive post terminal (1), a negative post terminal (2) and connecting pieces (3). Tightening nuts (11) are arranged on the positive pole column (1) and the negative pole column (2) respectively; central holes (16) are formed in the positive pole column (1) and the negative pole column (2) respectively; rigid studs (10) are arranged in the central holes (16); the positive pole column (1) and the negative pole column (2) are respectively connected with the rigid studs (10) by connecting pins (12); compression nuts (4) are arranged on the rigid studs (10); and the connecting pieces (3) are pressed against and fixed on the tightening nuts (11) by the pressing nuts (4). The lithium-ion power battery improves the connection fastness between the positive and negative pole columns (1 and 2) and the connecting pieces (3), the internal resistance of the battery is reduced, and the heavy load discharge performance of the lithium-ion power battery is improved. Therefore, the whole battery is more suitable for vehicle-mounted vibrating occasions and the like.

Description

technical field [0001] The invention relates to the technical field of batteries, and more specifically relates to a lithium-ion power battery. Background technique [0002] At present, due to electrochemical corrosion factors, lithium-ion battery poles can only use aluminum and copper, or stainless steel or nickel with a potential between the two. Because the conductivity of stainless steel is too low, it is not suitable for poles. However, nickel has poor processing performance, high cost, and the potential is close to copper, so it is only suitable as a negative electrode. [0003] In the prior art, there are mainly the following ways to connect the pole piece and the pole inside the single battery: [0004] The first is as figure 1 As shown, the positive pole tab a and the negative pole tab b of the battery cell are directly welded to the positive pole 1 and the negative pole 2 respectively by ultrasonic welding. [0005] The second is as figure 2 As shown, the batt...

AI Technical Summary

Problems solved by technology

[0010] The first is as Figure 4 As shown, the entire positive pole 1 is made of aluminum, and the entire negative pole 2 is made of copper. In order to fix the series-parallel connecting piece 3 between the monomers, the poles reserved at the upper ends of the positive pole 1 and the negative pole 2 must be Threads are made on the body, and then the connecting piece 3 is fixed by the nut 4 to realize the series-parallel connection between the single cells, or as Figure 5 As shown, a threaded hole 5 is opened in the center of the positive pole 1 and the negative pole 2, and then the connecting piece 3 is fixed by the bolt 6 to realize the series-parallel connection between the single cells. However, due to the low strength of copper and aluminum, the made The thread is easy to deform and wear, and it is easy to form slippage and tripping. It is not suitable for use on cars with vibration factors

[0011] The second such as Image 6 As shown, the central threaded hole 7 is set on the positive pole 1 and the negative pole 2, and then the steel wire screw sleeve 8 is installed, and the connecting piece 3 is fixed by the bolt 6 to realize the series-parallel connection between the single cells, or as Figure 7 As shown, the rigid screw 9 is screwed into the central threaded hole 7, and the connecting piece 3 is fixed by the nut 4 to realize the series-parallel connection between the single cells. These two methods have been improved, but in the fastening process, the force It will be transferred to the thread of the central threaded hole 7 with low strength, easy deformation and wear through the wire threaded sleeve 8 or rigid screw 9, and the process is complicated to realize and the cost is high. It is also not suitable for vehicles with vibration factors. use

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