Distributed type bilateral liquid-cooling system and flow control method for power battery system

Abstract

The invention relates to a distributed type bilateral liquid-cooling system and a flow control method for a power battery system. The power battery system comprises first to n battery module groups which are arranged in parallel in sequence; the liquid-cooling system a cooling liquid input pipe, a cooling liquid output pipe and first to n liquid-cooling channels which are arranged therebetween, and are arranged corresponding to the battery module groups; the cooling liquid input pipe, the liquid-cooling channels and the cooling liquid output pipe are liquid-cooling loops; and the liquid-cooling channels are in connection with the cooling liquid input pipe and the cooling liquid output pipe in space respectively. According to the flow control method, the cooling liquid flow ratio required by the liquid-cooling loops is worked out according to the heating power of the battery module groups; and the liquid-cooling loops are subjected to flow control design and verification. The pipeline distribution of the liquid-cooling system is simplified, thereby reducing the space and the cost, and solving the problem of uneven heat dissipation caused by uneven heating of the battery module groups; meanwhile, the cooling efficiency is high; the heat dissipation requirement under a high-multiplying power working condition is satisfied; the requirement of the power battery system on temperature difference is satisfied; and the service life of the power battery system is integrally prolonged.

Description

technical field [0001] The invention belongs to the technical field of methods or devices for directly converting chemical energy into electrical energy, such as battery packs, and in particular relates to a distributed double-side liquid cooling system for a power battery system that simplifies pipeline arrangement and solves the problem of uneven heat dissipation and flow control methods. Background technique [0002] At present, with the support of the state and the favorable market, the lithium battery industry is developing very rapidly, especially in public transportation systems, such as buses, passenger cars and logistics vehicles, and new energy vehicles based on lithium batteries are increasing day by day . [0003] However, with the large-scale application of lithium batteries, problems concerning the application of lithium batteries have become increasingly prominent. [0004] With the improvement of consumers' requirements for the power performance and fast ch...

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Problems solved by technology

[0006] The technical problem solved by the present invention is that, in the prior art, with the improvement of consumers' requirements for the power performance and fast charging performance of electric vehicles, the heating problem of power lithium-ion batteries during use is becoming more and more serious, resulting in The heating of the battery will increase the temperature of the battery, thereby reducing the life of the battery. However, the cooling efficiency of the traditional natural cooling method and forced air cooling method is low, and it is difficult to meet the heat dissipation requirements under high-magnification conditions. At the same time, it is also difficult To meet the temperature difference requirements of the power battery system, and the new liquid cooling system due to the increase in consumers' requirements for electric vehicles, the battery modules in the power battery system show a large number, irregular arrangement, uneven heat generation, etc., so There are still obvious weak problems, and then an optimized distributed double-sided liquid cooling system and flow control method for power battery systems are provided

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