Battery thermal management and in-vehicle heating system for electric vehicles based on ultra-fast charge-discharge technology

Abstract

The invention relates to the technical field of thermal management of electric vehicle power battery, in particular to an electric vehicle battery thermal management and in-vehicle heating system applied to ultra-fast charging and discharging technology. The invention is installed on an automobile and connected with an ECU of the automobile, and is composed of a battery pack module, a cooling circulation module and a heat pump air conditioning module. A temperature control loop is composed of an inlet water temperature sensor, an outlet water temperature sensor, an in-vehicle temperature sensor, an inlet reversing valve, an outlet reversing valve, a water pump, an air condition heat exchanger and a compressor and an automobile electronic control unit ECU. By utilizing the phase change endothermic property of phase change material to absorb fully and fill rapidly, the amount of heat emitted by a battery during discharge, The heat dissipation effect of the battery cell and the battery pack is improved, the heat generated in the charging and discharging process of the battery is brought into the vehicle through the air conditioner heat exchanger in winter, the battery pack can be cooled by the heat pump air conditioner in summer, the energy consumption is reduced, and the efficient heat dissipation of the battery pack and the cooling of the vehicle compartment are realized.

Description

1. Technical field [0001] The invention relates to the technical field of thermal management of electric vehicle power batteries, in particular to an electric vehicle battery thermal management and in-vehicle heating system applied to ultra-fast charging and discharging technology. 2. Background technology [0002] Significantly improving the charging and discharging speed of power batteries is one of the key issues that must be solved in the development of electric vehicles. First, battery packs for electric vehicles need to be capable of ultra-fast charging. At present, the charging speed of electric vehicles is generally slow. It usually takes 8 hours to fully charge with a household AC charger, and it takes tens of minutes to reach 80% of the electricity with a high-power DC charging pile, which is different from that of an internal combustion engine vehicle within a few minutes The refueling time is far apart, which seriously affects the experience of drivers and passe...

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Problems solved by technology

The Patent Office of the State Intellectual Property Office of China published a publication number CN106602171A on April 26, 2017, titled "A Phase Change Material / Air-Coupled Cascade Battery Thermal Management System"; Palletize two or more phase-change material boxes, and fill the phase-change material boxes at different positions of the battery with different phase-change materials to adapt to the uneven temperature distribution of the battery cell surface. The shell of the material box is equipped with ribs to take away heat through air cooling; however, the phase change material box only covers the surface between the two battery cells, and cannot control the temperature of the other surfaces of the battery cells, and the efficiency of air cooling heat exchange Low, when the battery pack is quickly charged and discharged, it cannot take away the heat in time; the Patent Office of the State Intellectual Property Office of China published a publication number CN104953202A on September 30, 2015, named "A Power Modular Battery Temperature control system”; this technology arranges phase-change temperature control plates on both sides of the battery cells, and sets heat exchange fluid pipelines in the bottom plate. The radiator dissipates heat to the outside of the car; however, the phase-change material box also only covers the two sides of the battery cell, the cooling area of ​​the battery is small, and the temperature of other surfaces of the battery cell cannot be controlled, and the heat is directly discharged to the battery cell through the radiator. Outside the car, the heat generated by the battery during fast charging and discharging is not properly utilized

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