A lithium-ion power battery with high safety performance

Abstract

A lithium-ion power battery with high safety performance, comprising: a case with an open end, a bare battery core formed by sequentially stacking and winding a positive pole piece, a separator, and a negative pole piece and accommodated in the case , and a top cover that is sealed and installed at the opening of the housing; the top cover is provided with a first pole, a second pole, and an explosion-proof valve and injection valve between the first pole and the second pole The liquid hole, the first pole is insulated from the top cover, and the second pole is electrically connected to the top cover; the outermost layer of the bare cell is set as a diaphragm layer, and the bare The outer surface of the cell is covered with a conductive sheath, and the conductive sheath is electrically connected to the first pole. The lithium-ion power battery provided by the invention can effectively reduce the risk of thermal runaway of the lithium-ion power battery when metal fragments are inserted into the interior of the lithium-ion power battery in a penetrating manner due to traffic accidents of the electric vehicle, and greatly improves the safety of the electric vehicle. safety performance.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a lithium ion power battery with high safety performance. Background technique [0002] With the development of the global economy, especially the development of the automobile industry, people consume more and more traditional energy, and the contradiction between energy supply and demand continues to escalate. People are eager to develop new clean energy to replace traditional energy to meet people's daily needs. The needs of life, while reducing environmental pollution. Driven by this demand, lithium-ion power batteries came into being. [0003] When lithium-ion power batteries are used in electric vehicles, traffic accidents such as collisions and frictions will inevitably occur due to the cars running on the road, so that the lithium-ion power batteries installed in electric vehicles will be abused, which will easily cause lithium The ion power battery is subjected to ...

AI Technical Summary

Problems solved by technology

[0003] When lithium-ion power batteries are used in electric vehicles, traffic accidents such as collisions and frictions will inevitably occur due to the cars running on the road, so that the lithium-ion power batteries installed in electric vehicles will be abused, which will easily cause lithium The ion power battery is subjected to huge vibrations or shocks, and even the metal guardrails on both sides of the road or various metal fragments on the car body penetrate the shell of the lithium-ion power battery and directly insert into the interior of the lithium-ion power battery, thus making the abused The internal resistance of the lithium-ion battery increases sharply, causing the lithium-ion battery itself to go into thermal runaway, causing a combustion explosion, and at the same time triggering thermal runaway of other power batteries in the same lithium-ion power battery pack, eventually forming a huge combustion explosion. and explosions, posing a great threat to the personal safety of people riding electric vehicles

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