Efficient heat radiation device for lithium ion power battery

Abstract

The invention discloses an efficient heat radiation device for a lithium ion power battery. The device comprises a thermal-arrest panel which can tightly fit with the battery, a U-shaped heat pipe filled with a working fluid and a radiating fin group. A bent part in the middle of the U-shaped heat pipe is embedded in the thermal-arrest panel, and overhanging parts at two ends of the U-shaped heat pipe extend out of the thermal-arrest panel. The radiating fin group is tightly secured to the overhanging parts of the U-shaped heat pipe through holes. By the device, efficient heat radiation of the lithium ion battery can be realized, and temperature uniformity between single batteries of a battery pack is raised. Thus, usability of the battery pack is raised, the thermorunaway risk is reduced, and service life of the battery pack is prolonged. A phase-change heat-transfer element heat pipe with high heat transfer coefficient is adopted. The phase-change heat-transfer element heat pip has good heat storage and heat radiation properties and has high operation reliability. Meanwhile, the device provided by the invention has advantages of simple structure and low cost, and is energy-saving and environmentally friendly.

Description

[0001] technical field [0002] The invention relates to a power battery technology of an electric vehicle, in particular to a heat dissipation device for a power battery that can improve the heat dissipation efficiency of the battery. Background technique [0003] Lithium-ion power batteries have attracted widespread attention due to their advantages such as high specific energy, environmental protection, and no memory. However, the high-rate charging and discharging process of lithium-ion power batteries will be accompanied by a large heat flow. If it cannot be exported in time, the heat will accumulate inside the battery, which will increase the temperature of the battery, shorten the service life of the battery, reduce its performance and affect its safety. . [0004] In addition, in practical applications, power batteries usually appear in the form of densely packed battery packs, so the heat generated by each battery cell is more likely to accumulate in the battery pa...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the service life of lithium-ion batteries is more than one year at 25°C, and the service life will be greatly shortened when it exceeds 40°C

At the same time, due to the uneven distribution of the temperature field inside the lithium-ion battery pack, the difference in the charge and discharge capacity of each battery cell will also shorten the battery life.

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