Lithium ion power battery

Abstract

The invention discloses a lithium ion power battery, comprising a battery core, a metal shell, electrolyte and a top cover that is fixedly connected to the metal shell, wherein the battery core comprises a positive electrode plate, a negative electrode plate and a diaphragm; a positive electrode lug and a negative electrode lug are respectively arranged on the positive electrode plate and the negative electrode plate; a positive pole column and a negative pole column are arranged on the top cover; the negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer; and the positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, characterized in that the negative electrode plate is provided with heat conductive heat collectors, each heat conductive heat collector is a current collector where the partial front side or / and partial reverse side of the negative electrode current collector is / are not coated with the negative electrode active material layer, at least two or more heat conductive heat collectors are stacked into a heat sink flow channel, the heat sink flow channel is superimposed or connected with a film heating sheet, and the heat sink flow channel and the film heating sheet form a heat sink flow channel heating assembly. According to the scheme ofthe invention, the problem that the battery temperature is too high or too low can be effectively solved, and the effects of controlling the temperature, prolonging the battery life, improving the production efficiency and the like can be 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 dual pressures to the energy crisis and environmental pollution, and there is an urgent need to vigorously develop and research efficient, clean and safe new energy vehicles to achieve energy conservation and emission reduction. Lithium-ion batteries have become the best candidate for new energy vehicle power systems due to their high specific energy, no pollution, and no memory effect. However, lithium-ion batteries are very sensitive to temperature, and the battery pack can discharge efficiently and maintain good performance within a suitable temperature range. High temperature will cause lithium-ion batteries to age faster, increase thermal resistance faster, fewer cycles, shorter service life, and even cause problems such as battery thermal runaway; low temperature will reduce the conductivity of the...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a lithium-ion power battery, which can effectively solve the problems of high or low battery temperature, achieve temperature control, improve battery life and improve production efficiency, etc.

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