Battery heating device for vehicle

A battery heating device for a vehicle comprising:

• a compressor configured to draw a refrigerant and to discharge the refrigerant after compressing the refrigerant;
• a heat emitter configured to emit heat of the refrigerant discharged from the compressor to a heat medium;
• a decompressor configured to decompress the refrigerant flowing from the heat emitter;
• an evaporator configured to evaporate the refrigerant decompressed by the decompressor;
• a battery temperature adjusting unit configured to heat a battery with the heat medium whose heat is absorbed by the evaporator or whose heat is emitted by the heat emitter;
• a low-temperature-side radiator arranged in parallel with the battery temperature adjusting unit in a flow of the heat medium whose heat is absorbed by the evaporator so as to exchange heat between the heat medium and outside air;
• a low-temperature-side first branch for the heat medium whose heat is absorbed by the evaporator to branch between the battery temperature adjusting unit and the low-temperature-side radiator;
• a low-temperature-side first confluence where the heat medium flowing through the battery temperature adjusting unit and the heat medium flowing through the low-temperature-side radiator merge toward the evaporator;
• a low-temperature-side second confluence where the heat medium whose heat is emitted by the heat emitter merges toward the battery temperature adjusting unit;
• a low-temperature-side second branch for the heat medium flowing through the battery temperature adjusting unit to branch toward the heat emitter;
• a low-temperature-side switching unit configured to switch the heat medium whose heat is emitted by the heat emitter to flow through the battery temperature adjusting unit or not;
• and
• a low-temperature-side radiator flow ratio reducing part arranged in a heat medium passage from the low-temperature-side first branch or the low-temperature-side second confluence closer to the low-temperature-side radiator, via the low-temperature-side radiator, to the low-temperature-side first confluence or the low-temperature-side second branch closer to the low-temperature-side radiator so as to reduce a ratio of a flow rate of the heat medium flowing through the low-temperature-side radiator relative to a flow rate of the heat medium whose heat is absorbed in the evaporator.

A battery heating device for a vehicle comprising:

• a compressor configured to draw a refrigerant and to discharge the refrigerant after compressing the refrigerant;
• a heat emitter configured to emit heat of the refrigerant discharged from the compressor to a heat medium;
• a decompressor configured to decompress the refrigerant flowing from the heat emitter;
• an evaporator configured to evaporate the refrigerant decompressed by the decompressor;
• a high-temperature-side radiator configured to radiate heat of the heat medium to outside air;
• a heater core arranged in parallel with the high-temperature-side radiator in a flow of the heat medium so as to heat air to be sent into a cabin by exchanging heat between the air and the heat medium;
• a battery temperature adjusting unit configured to heat a battery with the heat medium whose heat is emitted in the heat emitter;
• a heat emitter passage through which the heat medium whose heat is emitted in the heat emitter flows;
• a heater core passage that branches from the heat emitter passage and allows the heat medium to flow toward the heater core;
• a high-temperature-side radiator passage that branches from the heat emitter passage and allows the heat medium to flow toward the high-temperature-side radiator;
• a battery inlet side passage that branches from the heat emitter passage and allows the heat medium to flow toward the battery temperature adjusting unit;
• and
• a high-temperature-side four-way valve connected to the heat emitter passage, the heater core passage, the high-temperature-side radiator passage, and the battery inlet side passage so as to control a ratio of a flow rate of the heat medium flowing from the heat emitter passage to the heater core passage, a ratio of a flow rate of the heat medium flowing from the heat emitter passage to the high-temperature-side radiator passage, and a ratio of a flow rate of the heat medium flowing from the heat emitter passage to the battery inlet side passage, relative to a flow rate of the heat medium whose heat is emitted in the heat emitter.