Lithium-ion power battery

Abstract

The invention discloses a lithium-ion power battery, which comprises an electric core, a metal housing, an electrolyte and a top cover fixedly connected to the metal housing, wherein the electric coreincludes a positive pole piece, a negative pole piece and a diaphragm; the positive pole piece and the negative pole piece are respectively provided with a positive pole lug and a negative pole lug;the top cover is provided with a positive pole column and a negative pole column; the negative pole piece includes a negative current collector and a negative active material layer; and the positive pole piece includes a positive current collector and a positive active material layer. The lithium-ion power battery is characterized in that the positive pole piece is provided with heat conducting and collecting bodies, the heat conducting and collecting bodies are parts uncoated with the positive active material layer on the front or / and the back of the positive current collector, at least two heat conducting and collecting bodies are vertically laminated in the same area to form a heat flow concentration channel, the heat flow concentration channel extends into the abundant electrolyte in the metal housing, and the heat flow concentration channel is connected with fins or a three-dimensional network. The lithium-ion power battery can effectively solve a problem that the battery temperature is too high or too low, and achieves the effects of controlling the temperature, prolonging the battery life and improving the production efficiency.

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 energy crisis and environmental pollution. It is urgent to develop and research efficient, clean and safe new energy vehicles to achieve energy saving 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 electrolyte and the ability to cond...

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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