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Electric vehicle power battery cooling system and cooling method thereof

A technology for power batteries and electric vehicles, applied in electric vehicles, electric power units, power units, etc., can solve the problems of affecting current generation, longer charging time, and increased electrolyte viscosity, and achieve the effect of ensuring uniformity

Active Publication Date: 2021-03-23
冷王(上海)实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main cost of electric vehicles lies in the battery, which is sensitive to temperature and needs temperature control to ensure that the battery temperature is 20°C to 30°C. This is because higher temperatures will lead to electrode degradation and electrolyte decomposition, which will affect the service life of the battery; in addition , The viscosity of the electrolyte increases at low temperature, which hinders the movement of the charge carrier, affects the current generation, and affects the safety of the battery. In extreme cases, the electrolyte even freezes, causing the battery to fail to discharge and the electric vehicle to fail to start.
[0003] Therefore, the battery of an electric vehicle needs to be cooled. At the beginning, air cooling was used, because the temperature of the cooling air was limited by the ambient temperature, resulting in a low heat transfer efficiency; later, it was converted to liquid cooling, which required a refrigeration unit and a water circulation system, increasing the temperature. The weight and cost are reduced; direct cooling with refrigerant can save water pumps, waterways, fluorine water heat exchangers, etc., high evaporation temperature, large cooling capacity, and high energy efficiency; but direct cooling with refrigerant, the distribution of refrigerant inside the cold plate of the battery The uneven temperature of the battery cold plate will cause the cooling temperature of the battery cold plate to be uneven, which will cause some areas of the battery to not be effectively cooled. In the overheated area, the battery temperature is too high, causing the battery to age too quickly, and at the same time limiting the fast charge, resulting in charging longer time

Method used

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  • Electric vehicle power battery cooling system and cooling method thereof
  • Electric vehicle power battery cooling system and cooling method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Please combine figure 1It should be understood that this embodiment provides a power battery cooling system for an electric vehicle, which includes a battery cold plate 10, a refrigeration device 20, a first control valve 41, a heat exchanger 50, a first temperature sensor 71, a second temperature sensor 72, Alarm (not marked in the figure) and controller (not marked in the figure). The refrigeration device 20, the first control valve 41, the first temperature sensor 71, the second temperature sensor 72 and the alarm are all electrically connected to the controller.

[0051] The battery cold plate 10 is used to cool the power battery. The battery cold plate 10 is provided with a refrigerant circulation pipeline 11. The battery cold plate 10 is provided with a refrigerant inflow port 12 and a refrigerant outflow port 13. The refrigerant inflow port 12 and the refrigerant The outflow ports 13 communicate with the refrigerant circulation pipelines respectively. Refrigera...

Embodiment 2

[0067] Such as figure 2 As shown, the overall structure of the filter device in this embodiment is basically the same as that in Embodiment 1, the difference is that the electric vehicle power battery cooling system also includes an air conditioner evaporator 30, a second control valve 42 and an air conditioner. Liquid separator 60.

[0068] The air-conditioning evaporator 30 includes an air-conditioning evaporator inlet and an air-conditioning evaporator outlet, the air-conditioning evaporator inlet and the air-conditioning evaporator outlet communicate with the connecting pipelines respectively, and the air-conditioning evaporator 30 is electrically connected to the controller.

[0069] The second control valve 42 is arranged at one end of the connecting pipeline close to the inlet of the air conditioner evaporator, and the second control valve 42 is electrically connected with the controller. In this embodiment, the second control valve 42 is a thermal expansion valve, th...

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Abstract

The invention provides an electric automobile power battery cooling system and a cooling method thereof. The electric automobile power battery cooling system comprises a battery cooling plate, the battery cooling plate is used for cooling a power battery, a refrigerant circulating pipeline is arranged in the battery cooling plate, the battery cooling plate is provided with a refrigerant flowing inlet and a refrigerant flowing outlet, the refrigerant flowing inlet and the refrigerant flowing outlet communicate with the refrigerant circulating pipeline separately, and the supply quantity of a liquid refrigerant in the refrigerant circulating pipeline is larger than the evaporation capacity of the liquid refrigerant in the refrigerant circulating pipeline. The electric automobile power battery cooling method adopts the electric automobile power battery cooling system. According to the electric automobile power battery cooling system and the cooling method thereof, the supply quantity of the liquid refrigerant in the refrigerant circulating pipeline is larger than the evaporation capacity of the liquid refrigerant in the refrigerant circulating pipeline, and therefore the uniformity of the cooling temperature of the battery cooling plate can be guaranteed.

Description

technical field [0001] The present application relates to an electric vehicle power battery cooling system and a cooling method thereof. Background technique [0002] At present, electric vehicles have the advantages of low noise and no pollution during use, and are more and more widely used. The main cost of electric vehicles lies in the battery, which is sensitive to temperature and needs temperature control to ensure that the battery temperature is 20°C to 30°C. This is because higher temperatures will lead to electrode degradation and electrolyte decomposition, which will affect the service life of the battery; in addition , The viscosity of the electrolyte increases at low temperature, which hinders the movement of the charge carrier, affects the current generation, and affects the safety of the battery. In extreme cases, the electrolyte even freezes, causing the battery to fail to discharge and the electric vehicle to fail to start. [0003] Therefore, the battery of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60K1/00B60L58/26
CPCB60K1/00B60K2001/005B60L58/26Y02T10/70
Inventor 杜玉清
Owner 冷王(上海)实业有限公司