Power battery pack forced circulation system based on two-phase flow heat transfer and control method

A power battery pack and circulation system technology, applied in secondary batteries, refrigeration and liquefaction, circuits, etc., can solve problems such as inability to perform heat exchange in time and low heat exchange efficiency

Active Publication Date: 2020-05-12
TSINGHUA UNIV
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Problems solved by technology

[0004] Based on this, it is necessary to provide a power battery pack forced circulation system based on two-phase flow heat transfer for the problem that the heat transfer efficiency is low and the heat exchange cannot be performed in time in the traditional power battery pack forced circulation system based on two-phase flow heat transfer. Circulatory system and control method

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  • Power battery pack forced circulation system based on two-phase flow heat transfer and control method
  • Power battery pack forced circulation system based on two-phase flow heat transfer and control method
  • Power battery pack forced circulation system based on two-phase flow heat transfer and control method

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[0020] In order to make the purpose, technical solutions, and advantages of the application more clear, the application will be further described in detail below with reference to embodiments and drawings. It should be understood that the specific embodiments described here are only used to explain the application, and not used to limit the application.

[0021] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequence or technical meaning. The "connection" and "connection" mentioned in this application include direct and indirect connection (connection) unless otherwise specified. In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based ...

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Abstract

The invention provides a power battery pack forced circulation system based on two-phase flow heat transfer and a control method. A processor provided with multi-level pressure difference threshold values cooperates with an outlet refrigerant valve, a rotating speed of a compressor and an inlet electromagnetic expansion valve in real time to change the flow and evaporation pressure of a refrigerant cooperatively according to a pressure value difference between an inlet pressure detection device and an outlet pressure detection device. By regulating and controlling a sensible heat exchange ability and a latent heat exchange ability of the refrigerant, a heat safety protection and control purpose of preventing and controlling temperature distortion is achieved. Moreover, the pressure difference can be monitored in real time by means of the power battery pack forced circulation system based on two-phase flow heat transfer and levels can be divided. The regulating process is direct and efficient, so that the heat exchange efficiency of a battery module can be improved. Heat exchange is carried out timely, so that the generation time of thermorunaway triggered by the battery can be delayed, and therefore, the inhibiting performance for thermorunaway spread in a heat safety design of the battery module is improved favorably.

Description

Technical field [0001] This application relates to the technical field of battery thermal safety prevention and control, and in particular to a forced circulation system and control method for a power battery pack based on two-phase flow heat transfer. Background technique [0002] In order to ensure personal safety and the safety and reliability of electric vehicles, the current new energy vehicle technology route focuses on power battery cells, groups and systems, and has launched a full life cycle thermal safety management design and application research. On the basis of ensuring the battery's normal working temperature range, it absorbs safety prevention and control technology to avoid battery temperature rise failure and the spread of hazards. At present, the thermal safety management design and application research of the whole life cycle of power battery cells, groups and systems are mostly concentrated on the design of the heat exchange structure of the battery pack, the ...

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Application Information

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IPC IPC(8): F25B9/08F25B49/02H01M10/613H01M10/625H01M10/6556H01M10/6569
CPCF25B9/08F25B49/02H01M10/613H01M10/625H01M10/6556H01M10/6569Y02E60/10
Inventor 王炎王贺武李伟峰张亚军李成韩雪冰卢兰光欧阳明高
Owner TSINGHUA UNIV
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