Temperature controlling apparatus for battery, vehicle apparatus using the same, and controlling method therefor

A temperature controlling apparatus for batteries, which is provided with a cooling fan for sending cooling air to a plurality of batteries which are connected to each other, comprising:

• a temperature measuring device for measuring a temperature of each battery;
• a temperature difference calculating device for calculating temperature differences among batteries;
• a first setting device for setting and controlling a first current value sent to the cooling fan according to the temperature difference among batteries;
• a second setting device for setting and controlling a second current value sent to the cooling fan according to the temperature difference among batteries;
• a comparison controlling device which chooses larger current value between the first current value and the second current value so as to control the cooling fan.

A vehicle apparatus, having a motor for driving a vehicle or supporting an output from the vehicle engine and a plurality of batteries which are connected to each other for storing energy which is generated by the motor and energy which is regenerated by regenerating operation of the motor when the vehicle is decelerated and a cooling fan which sends cooling air to the batteries, comprising:

• a temperature measuring device for measuring a temperature of each battery;
• a temperature difference calculating device for calculating temperature differences among batteries;
• a controlling device for setting and controlling current value sent to the cooling fan according to the temperature differences among batteries;
• a speed measuring device for measuring driving speed of the vehicle;
• and
• an current limiting device for limiting the current according to the driving speed of the vehicle.

Controlling method for the temperature controlling apparatus for battery, which is provided with a cooling fan for sending cooling air to a plurality of batteries which are connected to each other, comprising steps of:

• a temperature measuring step for measuring a temperature of each battery;
• a temperature difference calculating step for calculating temperature differences among batteries;
• a first setting step for setting and controlling a first current value sent to the cooling fan according to the temperature differences among batteries;
• a second setting step for setting and controlling a second current value sent to the cooling fan according to the temperature differences among batteries;
• a comparison controlling step which chooses the larger current value between the first current value and the second current value so as to control the cooling fan.

Controlling method for the vehicle apparatus, having a motor for driving a vehicle or supporting an output from the vehicle engine and a plurality of batteries which are connected to each other for storing energy which is generated by the motor and energy which is regenerated by regenerating operation of the motor when the vehicle is decelerated and a cooling fan which sends cooling air to the batteries, comprising steps of:

• a temperature measuring step for measuring a temperature of each battery;
• a temperature difference calculating step for calculating temperature differences among batteries;
• a controlling step for setting and controlling current value sent to the cooling fan according to the temperature differences among batteries;
• a speed measuring step for measuring driving speed of the vehicle;
• and
• an current limiting step for limiting the current according to the driving speed of the vehicle.