Design method of power battery pole pieces

Abstract

The invention discloses a design method of power battery pole pieces. The method comprises steps as follows: S1, determining a structure of a battery cell; S2, determining the designed energy density, the capacity and the size of the battery cell; S3, cutting different sizes of pole pieces with different capacities with the adoption of the same energy density and number of layers, conducting thermal runaway triggering tests, and obtaining the maximum capacity and size which allow fire not to break out in all the triggering tests; S4, zoning the battery pole pieces in a battery actually required to be designed, wherein each zone is not larger than the maximum size measured in S3; S5, cutting joints of zones of the battery pole pieces; S6, conducting same joint cutting on all the battery pole cells of one battery cell, and aligning all joints during piece stacking. The design method of the battery cell pole pieces is simple, low in cost and easy to implement, the probability of breaking out of fire of the battery cell can be effectively reduced, and the method can support increase of the energy density and capacity of the battery cell.

Description

technical field [0001] The invention relates to the field of lithium batteries. Background technique [0002] Lithium-ion batteries, with their high energy density, have taken a mainstream place in powering mobile devices, including consumer electronics, electric vehicles, and aerospace equipment. [0003] As the main energy supply source of electric vehicles, in recent years, thermal runaway accidents of lithium-ion power batteries, fires and explosions have occurred from time to time. The thermal runaway of the power battery means that the internal chemical energy of the battery is rapidly converted into heat energy at a certain temperature. The cause of thermal runaway of lithium-ion batteries may be internal short circuit caused by thermal abuse, mechanical abuse, electrical abuse, etc. Whether it is the spontaneous combustion of the lithium-ion battery itself or the ignition caused by heat, for the lithium-ion battery warehouse and the power battery system, the fire a...

AI Technical Summary

Problems solved by technology

The existing technology does not take into account that with the increasing capacity of the battery core, once an internal short circuit occurs, more and more electric energy will pass through the short circuit point, and it will become more and more difficult to avoid fire and explosion due to thermal runaway

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