A lithium ion battery with high safety and acupuncture method

Abstract

A lithium ion battery with high safety includes a battery case, a bare cell is arranged in the battery case, the bare cell is wrapped with a protective case, and the protective case comprises an innerside electrode plate and an outer side electrode plate; a plate capacitor is arranged between the inner side electrode plate and the outer side electrode plate; the inner side electrode plate is in close contact with the bare battery core; the outer side electrode plate is in contact with the battery case; and the inner side electrode plate and the outer side electrode plate are insulated from each other and are not conductive. A lay of protective shell is added to that out layer of the bare battery core, and the protective shell can quickly absorb a large amount of electric current after thebattery is needled, reduce the heat generated by the battery, lower the temperature of the battery, avoid the combustion of organic electrolyte and other combustible materials, and ensure that the battery does not catch fire or explode.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-safety lithium-ion battery and an acupuncture method. Background technique [0002] At present, the battery system is mainly divided into ternary and iron-lithium. With the increase of energy density requirements, ternary has gradually become the mainstream, and the high-nickel material 811 is used more and more. However, the thermal stability of ternary materials is poor, and they are decomposed by heat to release oxygen. , the surface temperature can reach more than 600°C, it is easy to burn, the higher the energy density, the worse the safety, it is difficult for the ternary battery to pass the acupuncture test, and the current electrolyte is a flammable organic solvent, which further reduces the safety factor. [0003] In order to improve the safety performance of the ternary battery and ensure that the battery does not catch fire or explode when it is da...

AI Technical Summary

Problems solved by technology

However, the use of material modification, mainly doping and coating, will affect the gram capacity of the material itself and the diffusion coefficient of lithium ions, which will affect the performance of the battery; the use of flame-retardant electrolyte will reduce the conductivity of the electrolyte and affect the battery rate. The above method will bring about the decline of battery performance

Images