Lithium ion battery

Abstract

The invention provides a lithium ion battery, which comprises a shell, a cover plate, an electrolyte and a pole piece. A first lug and a second lug are led out from the pole piece; the pole piece is connected with a short circuit protection component, and the short circuit protection component has a three-layer structure and comprise a conductive layer in the middle and insulating layers on both sides of the conductive layer; one end of the conductive layer is electrically connected with the first lug of the pole piece, and the other end is a free end; and the outermost ring current collector is the one where the second lug is in. According to the lithium ion battery provided by the invention, the short circuit protection component arranged on the pole piece in the battery can initiatively convert complex short circuit inside the battery into large-area short circuit between positive / negative current collectors when the battery generates abnormal deformation under external force, so as to reduce internal short circuit heat in the battery to the minimum and shorten the heat conduction path; therefore, heat production rate of the battery lowers down, heat dissipation time of the battery is increased, and safety and reliability of the battery in harsh usage conditions are enhanced.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to a lithium ion battery. Background technique [0002] In the context of the depletion of non-renewable resources such as petroleum and the increasingly serious environmental pollution, people place great expectations on new energy vehicles. The power battery is the heart of new energy vehicles, and has received more and more attention and favor. However, during the use of the battery, there are always various uncontrollable and extremely harsh use conditions that cause short circuits inside the battery and generate a lot of heat, which greatly reduces the safety and reliability of the battery. [0003] At present, in the prior art, in order to prevent the internal short circuit of the battery, an insulating layer or insulating material is generally used to insulate and protect the battery, but this protection is relatively weak, and the internal short circuit will still occur when the b...

AI Technical Summary

Problems solved by technology

However, during the use of the battery, there are always various uncontrollable and extremely harsh conditions that cause a short circuit inside the battery and generate a lot of heat, which greatly reduces the safety and reliability of the battery.

[0003] At present, in the existing technology, in order to prevent the internal short circuit of the battery, the battery is generally insulated and protected by using an insulating layer or insulating material, but this protection is relatively weak, and the internal short circuit will still occur when the battery is deformed under abnormal external force

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