Lithium ion power battery

Abstract

The invention discloses a lithium ion power battery. The lithium ion power battery comprises a cell, a metal shell, an electrolyte and a top cover fixedly connected to the metal shell; the cell comprises a positive pole piece, a negative pole piece and a diaphragm; the positive pole piece and the negative pole piece are provided with a positive tab and a negative tab correspondingly; a positive pole column and a negative pole column are arranged on the top cover; the negative pole piece comprises a negative pole current collector and a negative pole active material layer; the positive pole piece comprises a positive pole current collector and a positive pole active material layer, and the lithium ion power battery is characterized in that a heat conduction heat collection body is arrangedon each of the positive pole piece and the negative pole piece separately; the heat conduction heat collection bodies are the current collectors of which the partial front surface and/or the partial back surface of the positive pole current collector and the negative pole current collector are/is not coated with the corresponding active material layers; at least more than two heat conduction heatcollection bodies are stacked into a heat confluence channel; the heat confluence channel is provided with an air-conditioning refrigerant pipe in a laminated or connected manner; and the heat confluence channel and the air conditioner refrigerant pipe form a heat confluence channel refrigerant assembly. According to the lithium ion power battery, the problems that the temperature of the battery is too high or too low can be effectively solved, and the effects of controlling the temperature and prolonging the service life of the battery and the like are achieved.

Description

(1) Technical field

[0001] The invention relates to a lithium ion battery, in particular to a lithium ion power battery. (2) Background technology

[0002] Transportation brings double pressure on energy crisis and environmental pollution. It is urgent to vigorously develop and research efficient, clean and safe new energy vehicles to achieve energy saving and emission reduction. Lithium-ion batteries have become the best candidates for new energy vehicle power systems due to their advantages such as high specific energy, no pollution, and no memory effect. However, lithium-ion batteries are very sensitive to temperature. Only in a suitable temperature range can the battery pack be discharged efficiently and maintain good performance. High temperature will make the aging speed of lithium-ion battery faster, the thermal resistance will increase faster, the number of cycles will be reduced, the service life will be shortened, and even cause problems such as battery thermal ru...

Images