Lithium ion battery

Abstract

The invention discloses a lithium ion battery. The lithium ion battery comprises a battery main body, wherein the battery main body comprises a plurality of battery pole groups, at least one protection plate is arranged at a middle part of each battery pole group, the protection plate is of a hollow structure, and the hollow structure of each protection plate is filled with a protection functional material such as a liquid containing halogenated carbonate ester, a phosphonitrile compound, trimethyl phosphate, triethyl phosphate, triphenyl phosphate, tributyl phosphate, trichloroethyl phosphate or dimethyl methylphosphate, a phase change material, a heat conductive graphite material or a composite material of any one material combined. In the lithium ion battery disclosed by the invention, the thermal runway of the battery can be effectively prevented when an accident occurs due to inappropriate charging, short circuit, acupuncture, extrusion or the battery exposed in a severe environment such as high temperature, the safety performance of the battery is ensured, and meanwhile, the high-temperature charge-discharge performance of the battery is improved.

Description

technical field [0001] The present application belongs to the technical field of batteries, and in particular relates to a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high specific energy, long cycle life, and no environmental pollution. As a secondary chemical power source that can convert electrical energy and chemical energy into each other, it is regarded as one of the popular candidate technologies for electric energy storage systems. . Since its birth, its application fields have been continuously expanded and developed rapidly. At present, it is not only widely used in mobile communication equipment and portable electronic equipment, but also widely used in large electric equipment such as electric tools, electric bicycles and electric vehicles. [0003] At present, electric vehicles and energy storage power stations generally need to use large-capacity lithium-ion power batteries as power s...

AI Technical Summary

Problems solved by technology

[0009] The disadvantage of these prior art solutions is that the phase change material is arranged, added or coated (coated) on the surface of the positive electrode and the negative electrode or in the pole sheet, which causes the surface resistance of the positive electrode and the negative electrode to increase, which affects the charge and discharge performance. During the charging and discharging process of the battery, side reactions with positive and negative active materials are easy to occur, which affects the cycle performance of the battery; adding phase change materials to the electrolyte will increase the viscosity of the electrolyte and introduce impurities, which is not conducive to the "extraction of lithium ions". " and "embedded", thus affecting the capacity of the battery; coating the phase change material on the surface of the battery avoids the negative reactions caused by setting, adding, and coating inside the battery, but it cannot effectively regulate and reduce the temperature inside the battery

Images