Battery cooling system and method

Abstract

The invention discloses a battery cooling system and method. The system comprises a battery box and a gas bottle filled with CO2 gas. A box air inlet and a box air outlet are arranged in the battery box, a gas bottle air outlet and the box air inlet are connected through a first pipeline, the box air outlet is connected with a second pipeline, a first control valve and a reducing valve are arranged on the first pipeline, a second control valve is arranged on a second pipeline, a first detection control device used for detecting the temperature of a battery is arranged in the battery box, and the first control valve, the reducing valve and the second control valve are all electrically connected with the first detection control device. The decompressed CO2 gas expands to absorb heat to cool the battery in the battery box, the temperature difference between the decompressed CO2 gas and the battery is 40 DEG C, heat exchange rate of the battery and the gas is greatly increased, and energy consumption is reduced because the CO2 gas does not require refrigeration before entering the battery box. In addition, the CO2 gas has a fire extinguishing function and can protect the battery.

Description

Technical field [0001] The invention relates to the field of electric buses, in particular to a battery cooling system and a cooling method. Background technique [0002] As energy and environmental issues become the focus of attention worldwide, electric buses that use drive motors and power batteries instead of traditional internal combustion engines and use power batteries as power sources will become important for the bus industry in the future due to their environmental protection and energy saving advantages. One of the development directions. [0003] Generally, the power battery cooling of electric buses uses the low-temperature air in the compartment to be sent into the battery box. The air flows through the surface of the battery to take away the heat generated by the battery, and finally flows to the outside atmosphere through the air outlet of the battery box to reach the battery. The purpose of group cooling. However, using the air in the cabin to cool the battery pa...

AI Technical Summary

Problems solved by technology

[0004] 1. In order to ensure the heat dissipation effect of the battery, the air flow used for cooling is large, and the cold air in the compartment will be evacuated in a short period of time. At this time, air with a higher temperature will be supplemented from the outside and sent into the battery box, but these The air with high temperature is difficult to make the temperature in the battery box achieve the expected cooling effect. Even if the air conditioner is used to provide cold air to the battery box for full-time and full-load cooling, it is difficult to meet the requirements. Moreover, cooling the air through the air conditioner will consume a lot of energy. ;

[0005] 2. The interior of the battery box cannot be isolated from the atmosphere. Moisture and dust in the air will enter the battery box. Long-term use will lead to poor heat dissipation, poor insulation performance between the main circuit of the battery and the shell, and vulnerable electrical connections inside the battery. Corrosion leads to poor reliability and other phenomena;

[0006] 3. In the event of a battery burning accident, the oxygen-enriched air sent from the compartment will intensify the combustion, and at the same time, the toxic gas will enter the air-conditioning system in the compartment, directly endangering the safety of passengers

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