Heat dissipating device and battery pack

Abstract

The invention discloses a heat dissipating device and a battery pack. The heat dissipating device comprises a plurality of heat conducting units arranged in a horizontal direction, a plurality of heat dissipating blocks made of phase change materials and a fan. Each of the heat conducting units comprises a plurality of heat conducting pipes arranged in a vertical direction, one end of each of the heat conducting units is defined as an evaporation end, the other end is defined as a condensation end, each of the heat dissipating blocks is respectively disposed between the condensation ends of two adjacent heat conducting units and the heat dissipating blocks are closely attached to the condensation ends of the heat conducting units, and air outlet direction of the fan is aligned with the condensation end of the heat conducting units. According to the invention, a separate structure of batteries and the heat dissipating blocks is achieved by the arrangement of the heat conducting units, the setting of heat dissipating blocks between the batteries as in the prior art is not needed, a series of safety problems caused by the leakage of a melt phase change material is avoided, and at the same time, the problem that a thermal management system fails due to the melting of all phase change materials during the long-term operation of the batteries is solved by setting the fan.

Description

technical field [0001] The invention relates to the technical field of battery devices, and more specifically relates to a heat dissipation device and a battery pack using the heat dissipation device. Background technique [0002] Among the existing heat sinks for battery packs, passive heat sinks using phase change materials as the cooling medium have the advantages of not requiring cooling fans, condensers, and cooling route design, etc., and phase change materials with high latent heat can absorb / Release a large amount of latent heat, adjust the temperature of the battery, and keep the temperature of the battery pack within a certain range, so it has received more and more attention in recent years. [0003] However, in the prior art, the aforementioned heat sinks for battery packs that use phase change materials as cooling medium fill the gaps between the batteries or around the batteries with phase change materials, which will cause a series of problems. First of all,...

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Problems solved by technology

[0003] However, in the prior art, the above-mentioned heat sinks for battery packs that use phase-change materials as the cooling medium fill the phase-change materials into the gaps between the batteries or around the batteries, which will cause a series of problems

First of all, some high thermal conductivity materials used to improve the thermal conductivity of phase change materials, such as metal nanoparticles and metal foams, are mostly good conductors. If the battery module is extruded or the phase change material expands at high temperature, these thermal conductivity materials are very likely to be separated from the The battery electrodes are in contact, which leads to a short circuit of the battery; secondly, when the battery is working for a long time or under high discharge rate conditions, the melting rate of the phase change material is also increasing, and the heat dissipation device of the battery pack will stop when the phase change material is completely dissolved. work, unable to continue to achieve the heat dissipation function of the battery pack

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