Lithium battery for electric vehicle

Abstract

The present application relates to the technical field of lithium batteries, in particular to a lithium battery for electric vehicles, the lithium battery includes a cell module, the cell module includes a connection plate and at least two battery chips, A board body made of material, on which pads and at least two sets of lug holes are arranged, the battery cell includes a battery cell body and a battery cell lug connected to one end of the battery cell body, and the battery lug Pass through the lug hole from the back of the connecting plate, bend toward the pad and weld it on the pad, all the cell bodies are stacked and fixed in sequence, and supporting spacers are provided between adjacent cell bodies In order to keep expansion gaps between adjacent battery chips, the problems of easy deformation of the battery and easy falling off of solder joints are solved as a whole through the cooperation of the connecting plate and the supporting spacer.

Description

technical field [0001] The present application relates to the technical field of lithium batteries, in particular to a lithium battery for electric vehicles. Background technique [0002] With the reduction of petroleum energy and the improvement of environmental awareness, electric vehicles are receiving more and more attention, and their popularity is getting higher and higher. Electric vehicles basically use batteries as energy sources, and convert electrical energy into mechanical energy through controllers, motors and other components. It can be seen that the battery is the energy source of the electric vehicle and belongs to the core component. At present, lithium-ion batteries (referred to as lithium batteries) are more efficient, safer, environmentally friendly, lighter in weight and longer in service life than traditional lead-acid batteries. Therefore, most electric vehicles use lithium batteries as battery components. [0003] The current lithium batteries for e...

AI Technical Summary

Problems solved by technology

At present, it is generally to directly stack multiple battery chips directly, and then use wires to connect the tabs of these battery chips (abbreviated as cell tabs) in series and parallel. However, the defects of this lithium battery are: (1) due to Electric vehicle lithium batteries generally include dozens of battery chips. It is difficult to weld the battery chips one by one with wires. During the welding process, it is easy to reverse polarity, short circuit, and break the battery tabs due to too many battery chips. , Welding is not firm and other defects, which lead to failure during use; (2) The structural strength of the battery tab directly welded to the wire is poor, and the lithium battery is prone to slight vibration due to vibration during the driving of the electric vehicle. Deformation, and deformation (such as a battery chip protruding outward) is prone to breakage of the battery tab or failure of the solder joint between the battery tab and the wire, which will lead to battery failure and affect the normal operation of the electric vehicle; (3) Due to the internal resistance of the lithium battery itself, heat will inevitably be generated during charging and discharging, which will cause each battery chip to heat up and expand. Since each battery chip is closely stacked together, the expansion tension will cause the battery chip to be affected Severe extrusion will cause safety problems such as internal short circuit, fire, and combustion. On the other hand, it will cause the overall shape of the battery to deform, which will lead to the above-mentioned solder joint failure problem and lead to battery failure.

Although this method can avoid the problems caused by expansion, its structure is complicated, not only the assembly process is complicated (it needs to be loaded into the support frame one by one and then welded, which is not conducive to automatic production), the cost is high, and it will reduce the overall weight of the battery assembly. And the volume is relatively large, which is quite unfavorable for the use of electric vehicles

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