A lithium-ion battery pack

Abstract

A lithium-ion battery pack, including a plurality of battery module packs, the positive poles and the negative poles of the battery module packs are respectively connected through a high-current connecting piece, and the high-current connecting piece includes a straight-shaped copper plate with a row of circular holes. The I-shaped nickel sheet and the I-shaped nickel sheet welded between two adjacent circular holes; the connecting terminals between the battery module groups are provided with a plurality of crimping holes and corresponding connecting wire cores, both of which are welded-pressed Tightly connected by means of connection-welding; the insulation board set at both ends of the positive and negative poles of the battery module group is a bakelite board with a plurality of round holes, and the side facing the positive and negative poles of the battery core is provided with a heat-conducting and explosion-proof insulating sheet; The invention solves the problem of circuit heating during high-current charging and discharging, increases the contact area between the connecting terminal and the wire, and reduces the connection temperature. The insulating plate and the heat-conducting explosion-proof insulating sheet can release the pressure when the battery is working abnormally, thereby preventing the battery from exploding and igniting. The battery pack of the invention has safe and reliable operation and long service life.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium ion battery pack. Background technique [0002] Existing high-current lithium-ion battery packs usually include a plurality of battery module groups composed of battery modules. A plurality of battery cells in each battery module group are connected in parallel through connecting pieces, and battery module groups are connected in parallel through connecting terminals and connecting wires. They are connected in series, and insulating plates are arranged on both sides of the positive and negative poles of the battery cells. The battery modules of the battery pack and the series and parallel connections between the positive and negative electrodes of the battery module group use metal sheets for resistance welding. Welding strength requires a high-power welding machine to output large energy to weld firmly. If the output energy of the welding machine is large, the weldi...

AI Technical Summary

Problems solved by technology

[0007] Another object of the present invention is to design a perforated insulating plate for a large-capacity lithium-ion battery pack to solve the above-mentioned problems of poor heat dissipation and failure to release pressure when the battery is abnormal, resulting in explosion and fire

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