Lithium-ion battery radiating structure and method based on phase-change microcapsule slurry

Abstract

The invention discloses a lithium-ion battery radiating structure based on phase-change microcapsule slurry. The lithium-ion battery radiating structure comprises lithium-ion batteries and cooling plates, wherein the plurality of cooling plates are arranged in parallel, and a layer or two layers of lithium-ion batteries are arranged in gaps among the cooling plates to form a lithium-battery pack radiating structure; the cooling plates are respectively welded by two cooling plate substrates and a plurality of cooling slurry flow channels are formed in the cooling plates; all the cooling slurryflow channels are distributed in a shape like a Chinese character ji, and are parallel each other; one end of each Chinese character ji-shaped flow channel is a cooling slurry inlet, and the other endof each Chinese character ji-shaped flow channel is a cooling slurry outlet; cooling slurry is arranged in the Chinese character ji-shaped flow channel; the cooling slurry is mixed slurry of coolingliquid and phase-change material microcapsules. The lithium-ion battery radiating structure based on the phase-change microcapsule slurry disclosed by the invention has the beneficial effects that theoperating temperature of the battery can be controlled to be a reasonable temperature window, the operating condition of a cooling system for power batteries under low cooling efficiency can be avoided, and the probability of the safety problems such as superheating of the batteries can be reduced, so that the indexes such as service life and heat safety of the power lithium batteries of electricvehicles are improved.

Description

technical field [0001] The invention belongs to the technical field of thermal management of electric vehicle power lithium-ion battery packs, and in particular relates to a lithium-ion battery heat dissipation structure and method based on phase-change microcapsule cooling slurry. Background technique [0002] Due to its advantages in specific energy, specific power, safety, and service life, lithium-ion batteries have gradually become one of the most ideal energy storage devices for electric vehicles. The performance of lithium-ion batteries is closely related to its temperature. Generally, the best operating temperature range of power lithium-ion batteries is 20-35°C, and the maximum operating temperature does not exceed 45°C. When the operating temperature is too high, the degradation process inside the lithium-ion battery will be significantly accelerated, which will significantly shorten the battery life; if the heat dissipation is not timely, it will even cause local ...

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Problems solved by technology

[0004] The above-mentioned cooling system of the electric vehicle power battery has the following problems: when the cooling load of the lithium-ion battery is low (such as: operating at a small rate in an environment of 30-35°C), the battery cooling system is consuming less energy at this time. In the case of high power, the output cooling capacity is very low, that is: the cooling efficiency of the cooling system (the ratio of cooling capacity to system power consumption) is low at this time; When running under charging and discharging), the temperature of the battery rises rapidly, and the above-mentioned cooling system has a certain hysteresis in the regulation of the battery temperature, so that the battery is prone to short-term overheating, and sometimes even damages the battery or causes a safety accident

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