Battery cooling plate structure

Abstract

The invention discloses a battery cooling plate structure, which comprises an upper plate and a lower plate, wherein the upper plate and the lower plate are welded into a whole to constitute a cooling plate; the upper plate and the lower plate are respectively provided with protrusions in opposite directions, a cooling channel and a plurality of heat-radiating cavities are formed among the protrusions, and the upper plate is provided with a water inlet and a water outlet, which are communicated with the cooling channel; the cooling channel is used for allowing cooling liquid to flow through and comprises a main channel and a plurality of branch channels communicated with the main channel; and the heat-radiating cavities and the branch channels are parallel mutually and are arranged at interval in a staggered manner. The battery cooling plate structure is simple in structure, low in manufacturing cost and simple in process and is good in controllability as a flow field structure inside the cooling plate can be distributed according to actual needs. By means of integrating the cooling plate into a power battery system of an electric vehicle, the requirement of a power battery assembly of the electric vehicle for the temperature can be better met, so that the stability of a battery system is increased and the service life of the battery system is prolonged.

Description

technical field [0001] The invention relates to a cooling technology for an electric vehicle power battery assembly, in particular to a battery cooling plate structure. Background technique [0002] Electric vehicles are required to have high-current charging and discharging performance in the battery system under the operating conditions of climbing slopes and emergency start-stops. Due to the insufficient performance of the battery, the battery system will release a large amount of heat during the high-current charging and discharging process and heat up. When the temperature rises to a certain level, the battery cell may have dangers such as leakage, explosion, and burning. [0003] At present, the heat dissipation scheme of the vehicle power battery module with moderate mixing and below mainly adopts the air-cooling method. The temperature of the cold air entering the battery module is relatively low. Due to the continuous heat absorption in the battery module, the tempe...

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Problems solved by technology

Due to insufficient battery performance, the battery system will release a large amount of heat during the high-current charge and discharge process and heat up. When the temperature rises to a certain level, the battery cell may have dangers such as leakage, explosion, and combustion.

[0003] At present, the heat dissipation scheme of the vehicle power battery module with moderate mixing and below mainly adopts the air-cooling method. The temperature of the cold air entering the battery module is relatively low. Due to the continuous heat absorption in the battery module, the temperature of the wind gradually increases, which will cause The inconsistency of battery heat dissipation leads to inconsistency in the working environment of the battery, which affects the life of the entire battery pack

With the emergence of strong mixing and plug-in, the requirements for battery system capacity and charge and discharge power are higher, and air cooling cannot meet the heat dissipation requirements at all. Liquid cooling with high cooling efficiency and good controllability is required.

[0004] At present, there are two main methods of liquid cooling: one is a liquid-cooled heat exchanger, which has high cooling efficiency and good controllability, but its structure cannot meet the requirements of lightness and thinness, and it cannot be integrated into a battery system with special requirements.

One is the cooling water plate spliced ​​by cooling flat tubes, which can be integrated into the battery system with special requirements, but this structure has many welding points, which reduces the reliability of the cooling water plate, and the process is complicated and the cost is high ; In addition, because the cooling flat tube cannot change the flow resistance according to actual needs, the flow field inside the cooling plate cannot be controlled, and the distribution of the flow field is uneven.

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