Battery temperature control device

Abstract

Appropriately select between battery cooling using a refrigeration cycle and battery cooling using heat dissipation from a radiator. [Solution] When the battery temperature TB is above a threshold S and there is a need to cool the battery, in the region where the ambient temperature To is below a threshold S2, the battery is cooled by a second cooling mode, which cools the battery by heat dissipation from a low-temperature radiator. When the temperature TB is above a threshold S3, the battery is cooled by a first cooling mode, which cools the battery using a refrigeration cycle (refrigerant circuit). In the region where the temperature TB is below a threshold S3 and the ambient temperature To is above a threshold S2, cooling mode switching control is performed. In the cooling mode switching control, if the temperature Tbw of the battery and the refrigerant flowing through the low-temperature radiator is below a target temperature Tt, cooling is performed in the second cooling mode, and if the temperature Tbw remains above the target temperature Tt for a predetermined time, cooling is performed in the first cooling mode.

Claims

1. A battery thermal circuit circulates a heat transfer medium to regulate the battery temperature, A battery temperature control device comprising a control device that selects a first cooling mode for cooling the battery by cooling the heat transfer medium with a refrigeration cycle and a second cooling mode for cooling the battery by releasing the heat from the heat transfer medium to the outside air from a radiator, The control device is When there is a need to cool the aforementioned battery, If the temperature of the battery is below the first set temperature and the ambient temperature is above the second set temperature, When the temperature of the heat transfer medium is below the target temperature, the second cooling mode is selected. A battery temperature control device that selects the first cooling mode when the temperature of the heat transfer medium remains higher than the target temperature for a predetermined period of time or longer.

2. The control device is The battery temperature control device according to claim 1, which sets the target temperature based on the input and output current of the battery.

3. The control device is The battery temperature adjustment device according to claim 1 or claim 2, wherein the second cooling mode is selected when the ambient temperature is lower than the second set temperature.

4. The control device is The battery temperature adjustment device according to claim 3, wherein the first cooling mode is selected when the temperature of the battery is higher than the first set temperature.

5. The control device is The battery temperature control device according to claim 1 or 2, wherein the first cooling mode is selected when the ambient temperature is higher than or equal to a third set temperature, which is higher than the second set temperature.

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