Lithium-ion power battery

A power battery, lithium-ion technology, applied in the field of lithium-ion power batteries, can solve the problems of high temperature and low temperature

CN109860759APending Publication Date: 2019-06-07长沙聚能充新能源有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-06-07

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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 laminated to form a heat flow concentration channel, the heat flow concentration channel is laminated or connected with an insulating component, and the heat flow concentration channel and the insulating component form an insulating heat flow concentration channel assembly. 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.
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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...

Examples

Embodiment Construction

[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0051]The technical solution of the present invention is: a lithium-ion power battery, including a battery cell, a metal casing for accommodating the battery cell, an electrolyte injected into the metal casing, and a top fixedly connected to the metal casing. Cover; the cell includes a positive electrode sheet, a negative electrode sheet, and a diaphragm spaced between the positive electrode sheet and the negative electrode sheet, and is sequentially laminated or wound to form an electric cell; the positive electrode sheet is provided with a positive electrode lug; The negative pole sheet is provided with a negative pole tab; the top cover is provided with a positive pole pole electrically connected to the positive pole pole, and a negative pole pole electrically connected to the negative pole pole; the negative pole piece includes a negative pole A current c...