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 electrode piece, a negative electrode piece and a diaphragm; the positive electrode piece and the negative electrode piece are provided with a positive tab and a negative tab correspondingly; the top cover is provided with a positive electrode column and a negative electrode column; the negative electrode piece comprises a negative electrode current collector and a negative electrode active material layer; the positive electrode piece comprises a positive electrode current collector and a positive electrode active material layer, and the lithium ion power battery is characterized in that the positive electrode piece and the negative electrode piece are provided with heat conduction heat collection bodies; the heat conduction heat collection bodies are the current collectorsof 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 heat collection bodies are stacked into a heat conduction and heat collection heat confluence flow channel; and the heat confluence flow channel extends into the abundant electrolyte in the metal shell, and the heat confluence flow channel is connected with fins or a three-dimensional network. 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, prolonging the battery life 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