Vehicle battery cooling device

Abstract

To provide a vehicle battery cooling device which has individual fluid circuits for cooling a battery in both cases where a vehicle is traveling and the battery is charged.SOLUTION: A vehicle battery cooling device 16 cools a battery 15 mounted on a vehicle 10. The vehicle battery cooling device 16 comprises: a first fluid circuit 18 where first cooling fluid 17 is circulated to cool a battery 15 when the vehicle 10 is traveling; and a second fluid circuit 20 where second cooling fluid 19 is circulated to cool the battery 15 when the battery 15 is charged. The first fluid circuit 18 and the second fluid circuit 20 are respectively individual fluid circuits.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vehicle battery cooling device, and more particularly to a vehicle battery cooling device having a plurality of fluid circuits for cooling a battery. [Background technology]

[0002] An electric vehicle is equipped with a battery that stores power for driving. The battery generates heat when discharging while driving, and also generates heat when charging. Therefore, the temperature of the battery is managed and regulated to be within a certain temperature range. That is, the battery is heated so that the temperature does not fall below a lower limit temperature, and is cooled so that the temperature does not exceed an upper limit temperature. In this way, the discharge efficiency and charge efficiency are ensured to be at a certain level or higher.

[0003] Patent Document 1 describes an invention in which an external charger is connected to a battery cooling circuit arranged inside a vehicle, and cooling water is injected and circulated to cool the battery during charging. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-105988 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the battery cooling devices described in the above-mentioned patent documents have room for improvement in terms of effectively cooling the battery during driving and charging.

[0006] Specifically, in Patent Document 1, cooling water is supplied from outside the vehicle to cool the vehicle-mounted battery, but the vehicle-mounted battery is not cooled by using both an on-board cooling device and an external cooling device. Therefore, it is not easy to keep the temperature band of the battery within a certain range both during driving and charging using the invention described in Patent Document 1.

[0007] The present invention has been made in consideration of these problems, and an object of the present invention is to provide a vehicle battery cooling device that has separate fluid circuits for cooling the battery both when driving and when charging. [Means for solving the problem]

[0008] The present invention is a vehicle battery cooling device that cools a battery mounted on a vehicle, the device comprising: a first fluid circuit that is mounted on the vehicle and through which a first cooling fluid that cools the battery flows when the vehicle is running; and a second fluid circuit that is mounted on the vehicle and through which a second cooling fluid that is a liquid that cools the battery flows when the battery is charged, the first fluid circuit and the second fluid circuit being independent fluid circuits, the first fluid circuit being capable of allowing the first cooling fluid to flow therethrough and having a first contact portion that covers a first surface of a surface of the battery, the second fluid circuit being capable of allowing the second cooling fluid to flow therethrough and having a second contact portion that covers a second surface of the surface of the battery that is different from the first surface, and the second fluid circuit being configured to drain the second cooling fluid from the second fluid circuit when the vehicle is running, The first cooling fluid is a liquid, and the first cooling fluid is drained from the first fluid circuit when the battery is being charged. It is characterized by: Effect of the Invention

[0013] According to the present invention, it is possible to provide a vehicle battery cooling device having separate fluid circuits for cooling the battery both during driving and during charging. [Brief description of the drawings]

[0018] [Figure 1] 1 is a perspective view showing a vehicle equipped with a vehicle battery cooling device according to an embodiment of the present invention; [Diagram 2] 1 is a schematic diagram showing a configuration of a vehicle battery cooling device according to an embodiment of the present invention; [Diagram 3] 1A and 1B are diagrams showing a vehicle battery cooling device according to an embodiment of the present invention, in which (A) is a block diagram showing the configuration of the battery and each fluid circuit, (B) is a block diagram showing another configuration of the battery and each fluid circuit, and (C) is a schematic diagram showing the configuration of the biasing section. [Figure 4] 1A and 1B are diagrams showing a vehicle battery cooling device according to an embodiment of the present invention, in which (A) is a schematic cross-sectional view showing the configuration of a first fluid circuit and a second fluid circuit, and (B) is a schematic cross-sectional view showing another configuration of the first fluid circuit and the second fluid circuit. [Diagram 5] 1 is a block diagram showing a connection configuration of a vehicle battery cooling device according to an embodiment of the present invention; [Figure 6] 4 is a flowchart showing an operation of the vehicle battery cooling device according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] A vehicle battery cooling device 16 according to an embodiment of the present invention will be described in detail below with reference to the drawings. In the following description, the front, rear, up, down, left and right directions are used, and the left and right directions refer to the left and right directions when the vehicle 10 is viewed from the rear. Furthermore, in the following description, the same members are generally given the same reference numerals, and repeated description will be omitted.

[0020] FIG. 1 is a perspective view showing a vehicle 10 equipped with a vehicle battery cooling device 16. As shown in FIG.

[0021] A vehicle 10 such as an automobile or a train is equipped with a battery 15 for supplying power to a motor and various electrical components. The vehicle 10 is, for example, an EV (Electrical Vehicle), an HEV (Hybrid Electrical Vehicle), a PHEV (Plug-in Hybrid Electrical Vehicle), or the like.

[0022] For convenience of explanation, a rear gate covering the rear end of the body of the vehicle 10 is omitted in Fig. 1. A rear seat 13 is arranged at the rear of the passenger compartment of the vehicle 10, and a rear floor 12 is arranged further rearward of the rear seat 13. A battery 15 (not shown here, described later) is arranged in a storage space 11 below the rear floor 12. In addition, a vehicle battery cooling device 16 for cooling the battery 15 is arranged near the battery 15, as described later.

[0023] Furthermore, the battery 15 and the vehicle battery cooling device 16 are not limited to being arranged below the rear floor 12, but can also be arranged below the front floor (not shown) where the driver's seat and passenger seat are located.

[0024] FIG. 2 is a schematic diagram showing the configuration of the vehicle battery cooling device 16. As shown in FIG.

[0025] The vehicle battery cooling device 16 is a device for cooling the battery 15 mounted on the vehicle 10, and has a first fluid circuit 18 and a second fluid circuit 20. A first cooling fluid 17 for cooling the discharging battery 15 flows through the first fluid circuit 18 when the vehicle 10 is running. On the other hand, a second cooling fluid 19 for cooling the battery 15 flows through the second fluid circuit 20 when the vehicle 10 is stopped and the battery 15 is being charged. The first fluid circuit 18 and the second fluid circuit 20 are independent fluid circuits. As described below, the vehicle battery cooling device 16 can effectively cool the battery 15 both when the battery 15 is running and when the battery 15 is being charged. Furthermore, since there is no need to mount a cooling device for cooling the second fluid circuit 20 on the vehicle 10, the vehicle 10 can be made lighter.

[0026] The first fluid circuit 18 is disposed at a position where it can exchange heat with the battery 15 , and is connected to the in-vehicle cooling device 21 via a first fluid path 30 .

[0027] As the in-vehicle cooling device 21, for example, an evaporator of a refrigeration cycle for cooling the vehicle interior, a radiator, or the like can be adopted.

[0028] The first fluid path 30 is a pipe connecting the in-vehicle cooling device 21 and the first fluid circuit 18. As the first cooling fluid 17, any fluid that can flow between the first fluid circuit 18 and the in-vehicle cooling device 21 can be generally adopted, and for example, a fluid such as water, a refrigerant gas, a gas, etc. can be adopted. A pump (not shown) for circulating the first cooling fluid 17 is interposed in the middle of the first fluid path 30. When cooling the battery 15 with the first fluid circuit 18, the first cooling fluid 17, which has been heated to a high temperature by absorbing heat from the battery 15, is circulated between the first fluid circuit 18, the first fluid path 30, and the in-vehicle cooling device 21 while being cooled by the in-vehicle cooling device 21.

[0029] The second fluid circuit 20 is a cooling circuit arranged separately from the first fluid circuit 18. The second fluid circuit 20 is disposed at a position where it can exchange heat with the battery 15, and is connected to the exterior cooling device 22 via a second fluid path 31.

[0030] The exterior cooling device 22 is installed outside the vehicle 10, and is, for example, a cooling device integrated with a stationary exterior charging device 25. As the exterior cooling device 22, an evaporator of a refrigeration cycle, a radiator, or the like can be adopted.

[0031] The second fluid path 31 is a pipe connecting the outside-vehicle cooling device 22 and the second fluid circuit 20. As the second cooling fluid 19, various fluids can be generally adopted, as with the first cooling fluid 17, and for example, fluids such as water, refrigerant gas, gas, etc. can be adopted. A pump (not shown) for circulating the second cooling fluid 19 is interposed in the middle of the second fluid path 31. When cooling the battery 15 with the second fluid circuit 20, the second cooling fluid 19 is circulated between the second fluid circuit 20, the second fluid path 31, and the outside-vehicle cooling device 22 while the second cooling fluid 19, which has been heated to a high temperature by absorbing heat from the battery 15, is cooled by the outside-vehicle cooling device 22.

[0032] Further, a fluid connection part 33 is provided in the middle of the current supply circuit 26. The fluid connection part 33 is an attachment port provided on the vehicle 10, and is a part where an occupant or an operator connects the vehicle 10 side part of the second fluid path 31 to the vehicle exterior part of the second fluid path 31. Specifically, an attachment type can be adopted as the fluid connection part 33. While the vehicle 10 is traveling, the second fluid path 31 is not connected by the fluid connection part 33. When the vehicle 10 is charging, the vehicle 10 side part of the second fluid path 31 is connected to the vehicle exterior part at the fluid connection part 33.

[0033] The external-vehicle charging device 25 is a fixed charging device installed outside the vehicle, and is connected to the battery 15 via a current supply circuit 26. An attachment-type current connection portion 32 is provided in the current supply circuit 26, and the current supply circuit 26 is not connected at the current connection portion 32 when the vehicle 10 is running. When charging the battery 15, the current supply circuit 26 is connected at the current connection portion 32. Here, the current connection portion 32 of the current supply circuit 26 and the fluid connection portion 33 of the second fluid path 31 can also be configured as an integrated attachment device. In this way, the current connection portion 32 and the fluid connection portion 33 can be connected and disconnected collectively.

[0034] FIG. 3(A) is a block diagram showing the configuration of the battery 15 and each fluid circuit, FIG. 3(B) is a block diagram showing another configuration of the battery 15 and each fluid circuit, and FIG. 3(C) is a schematic diagram showing the configuration of the biasing section.

[0035] 3(A), the first fluid circuit 18 is disposed directly below the battery 15, and the second fluid circuit 20 is disposed directly below the first fluid circuit 18. In this manner, the battery 15 can be cooled by the first cooling fluid 17 flowing through the first fluid circuit 18 while the vehicle 10 is running. Furthermore, during charging, the battery 15 can be cooled via the second cooling fluid 19 flowing inside the second fluid circuit 20 and the first cooling fluid 17 present inside the first fluid circuit 18.

[0036] 3(B), here, the first fluid circuit 18 and the second fluid circuit 20 are disposed below the battery 15. Specifically, the first fluid circuit 18 is disposed immediately below the battery 15 on the left side, and the second fluid circuit 20 is disposed immediately below the battery 15 on the right side. In this manner, both the first fluid circuit 18 and the second fluid circuit 20 are in close contact with the battery 15, so that the battery 15 can be more effectively cooled using the first fluid circuit 18 and the second fluid circuit 20.

[0037] 3(C), here, the first fluid circuit 18 and the second fluid circuit 20 are disposed directly below the battery 15. Furthermore, the first fluid circuit 18 is urged toward the battery 15 side by a first urging portion 28, and the second fluid circuit 20 is urged toward the battery 15 side by a second urging portion 29. A spring or an air piston can be used as the first urging portion 28 and the second urging portion 29.

[0038] When cooling the battery 15 while driving, the first biasing portion 28 presses the first fluid circuit 18 against the battery 15, promoting heat exchange between the battery 15 and the first cooling fluid 17 inside the first fluid circuit 18, thereby effectively cooling the battery 15. In addition, at this time, the biasing force of the second biasing portion 29 may be weakened to move the second fluid circuit 20 away from the battery 15. In this way, it is possible to prevent unintentional heat exchange between the second cooling fluid 19 inside the second fluid circuit 20 and the battery 15, and to more effectively cool the battery 15 while driving.

[0039] On the other hand, when cooling the battery 15 during charging, the second fluid circuit 20 is pressed against the battery 15 by the second biasing portion 29, which promotes heat exchange between the battery 15 and the second cooling fluid 19 inside the second fluid circuit 20, thereby effectively cooling the battery 15. In addition, at this time, the biasing force of the first biasing portion 28 may be weakened to move the first fluid circuit 18 away from the battery 15. In this way, it is possible to prevent unintentional heat exchange between the first cooling fluid 17 inside the first fluid circuit 18 and the battery 15, and to more effectively cool the battery 15 during charging.

[0040] FIG. 4(A) is a schematic cross-sectional view showing the configuration of the first fluid circuit 18 and the second fluid circuit 20, and FIG. 4(B) is a schematic cross-sectional view showing another configuration of the first fluid circuit 18 and the second fluid circuit 20.

[0041] Referring to FIG. 4(A), here, the upper surface and side surface of the battery 15 are covered by the second fluid circuit 20, and the lower surface of the battery 15 is covered by the first fluid circuit 18. Then, during running, the first cooling fluid 17 is caused to flow through the first fluid circuit 18 to cool the battery 15. Furthermore, by draining the second cooling fluid 19 from the second fluid circuit 20 and further putting the inside of the second fluid circuit 20 into a reduced pressure or vacuum state as necessary, it is possible to suppress heat reception from the surroundings of the battery 15 and improve temperature control efficiency. Furthermore, during charging, the upper surface and side surface of the battery 15 can be effectively cooled by the second cooling fluid 19 flowing through the inside of the second fluid circuit 20. Furthermore, during charging, by putting the inside of the first fluid circuit 18 into a reduced pressure or vacuum state, it is possible to suppress heat reception from the lower surface of the battery 15 and improve temperature control efficiency.

[0042] 4(B), here, the bottom surface of the battery 15 is covered by the first fluid circuit 18. Also, the top surface and side surface of the battery 15 are covered by the second fluid circuit 20. Furthermore, the top surface of the battery 15, the left side surface of the battery 15, and the right side surface of the battery 15 are each covered by an individual second fluid circuit 20.

[0043] In this way, the flow rate of the second cooling fluid 19 flowing through the second fluid circuit 20 can be changed according to the amount of heat generated locally by the battery 15. Specifically, when the battery 15 is charged or discharged, the amount of heat generated from the terminals arranged on the upper surface side of the battery 15 is large. That is, when the battery 15 is charged or discharged, the amount of heat generated from the upper surface side of the battery 15 is larger than the amount of heat generated from the side surface side of the battery 15. Therefore, the flow rate of the second cooling fluid 19 flowing through the second fluid circuit 20 formed on the upper surface side of the battery 15 is made larger than the flow rate of the second biasing portion 29 flowing through the second fluid circuit 20 formed on both the left and right sides of the battery 15. In this way, it is possible to prevent the upper surface side of the battery 15 from becoming too hot, and to prevent a decrease in the charge / discharge efficiency of the battery 15.

[0044] 5 is a block diagram showing a connection configuration of the vehicle battery cooling device 16. The vehicle battery cooling device 16 has an arithmetic and control unit 24, a battery temperature detection unit 23, a charge detection unit 27, a storage unit 14, an on-board cooling device 21, and an external cooling device 22.

[0045] The arithmetic control unit 24 is, for example, a CPU, and has an input terminal connected to the battery temperature detection unit 23, the charge detection unit 27, and the storage unit 14, and an output terminal connected to the on-vehicle cooling device 21 and the external cooling device 22. The arithmetic control unit 24 controls the operations of the on-vehicle cooling device 21 and the external cooling device 22 based on information input from the battery temperature detection unit 23, the charge detection unit 27, and the storage unit 14.

[0046] The battery temperature detection unit 23 detects the temperature of the battery 15 and inputs the detection result to the calculation control unit 24 .

[0047] The charging detection unit 27 detects the state in which the battery 15 is being charged, and inputs the detection result to the calculation control unit 24.

[0048] The storage unit 14 is a RAM or a ROM, and stores programs, parameters, and the like for the vehicle battery cooling device 16 to operate.

[0049] As described above, the in-vehicle cooling device 21 is a cooling device mounted on the vehicle 10, and cools the battery 15 when the vehicle 10 is running.

[0050] As described above, the exterior cooling device 22 is a cooling device that is installed outside the vehicle, such as at a charging station, and cools the battery 15 when the vehicle 10 is charging.

[0051] Fig. 6 is a flowchart showing the operation of the vehicle battery cooling device 16. The operation of the vehicle battery cooling device 16 will be described below based on Fig. 6 and with reference to the above-mentioned figures.

[0052] In step S10, the vehicle 10 is stopped and charging of the battery 15 begins.

[0053] In step S11, an occupant or an operator connects to the connector. Specifically, referring to Fig. 2, by connecting the current supply circuit 26 at the current connection unit 32, the external charging device 25 and the battery 15 are connected via the current supply circuit 26. In addition, by connecting the second fluid path 31 at the fluid connection unit 33, the second fluid circuit 20 and the external cooling device 22 are connected via the second fluid path 31.

[0054] In step S12, the arithmetic and control unit 24 determines whether charging is necessary. That is, based on the voltage of the battery 15 mounted on the vehicle 10, the arithmetic and control unit 24 determines whether charging is necessary.

[0055] If the answer is YES in step S12, the calculation and control unit 24 proceeds to step S14 to charge the battery 15.

[0056] If the result of step S12 is NO, the calculation control unit 24 proceeds to step S13.

[0057] In step S13, the calculation control unit 24 ends the charging operation of the battery 15. Specifically, when an occupant or the like disconnects the connector described above, the current supply circuit 26 is separated at the current connection portion 32 and the second fluid path 31 is separated at the fluid connection portion 33.

[0058] In step S14, the calculation and control unit 24 starts charging. That is, based on an instruction from the calculation and control unit 24, power is supplied from the external vehicle charging device 25 to the battery 15 via the current supply circuit 26.

[0059] In step S15, the arithmetic and control unit 24 checks the connection state of the fluid connection unit 33.

[0060] If the answer is YES in step S15, that is, if the fluid connection unit 33 is in a connected state, the calculation control unit 24 proceeds to step S16. That is, an exterior cooling mode is executed in which the battery 15 is cooled using the exterior cooling device 22 arranged outside the vehicle.

[0061] If the answer is NO in step S15, that is, if the fluid connection part 33 is in a non-connected state, the calculation and control part 24 proceeds to step S24.

[0062] In step S16, the calculation control unit 24 uses the charge detection unit 27 to determine whether the battery 15 requires charging.

[0063] If the answer is YES in step S16, the calculation and control unit 24 proceeds to step S18 to charge the battery 15.

[0064] If the result of step S16 is NO, the calculation control unit 24 proceeds to step S17.

[0065] In step S17, the arithmetic and control unit 24 ends the charging operation of the battery 15. The arithmetic and control unit 24 also stops the exterior cooling device 22, thereby ending the cooling of the second fluid circuit 20.

[0066] In step S18, the calculation control unit 24 determines whether or not the measured temperature Tb of the battery 15 is equal to or higher than a first target temperature, using the battery temperature detection unit 23. Here, the first target temperature is, for example, 30°C.

[0067] If the answer is YES in step S18, the calculation and control unit 24 determines that the cooling capacity of the exterior cooling device 22 alone is not sufficient, and proceeds to step S19.

[0068] If the answer is NO in step S18, the calculation and control unit 24 determines that the cooling capacity is sufficient with only the exterior cooling device 22, and proceeds to step S15. That is, cooling of the battery 15 using only the exterior cooling device 22 is continued.

[0069] In step S19, the calculation control unit 24 executes the combined cooling mode. That is, the battery 15 is cooled while circulating the second cooling fluid 19 between the exterior cooling device 22 and the second fluid circuit 20. Furthermore, the on-board cooling device 21 is operated to circulate the first cooling fluid 17 between the first fluid circuit 18 and the on-board cooling device 21, thereby further cooling the battery 15.

[0070] In step S20, the calculation control unit 24 uses the charge detection unit 27 to determine whether the battery 15 requires charging.

[0071] If the answer is YES in step S20, the calculation and control unit 24 proceeds to step S22 to charge the battery 15.

[0072] If the result of step S20 is NO, the calculation control unit 24 proceeds to step S21.

[0073] In step S21, the calculation and control unit 24 ends the charging of the battery 15. In addition, the calculation and control unit 24 stops the external charging device 25 and the in-vehicle cooling device 21, thereby ending the cooling of the battery 15.

[0074] In step S22, the calculation control unit 24 determines whether the measured temperature Tb of the battery 15 measured by the battery temperature detection unit 23 is equal to or higher than a second target temperature. Here, the second target temperature is a temperature set higher than the above-mentioned first target temperature. Here, the second target temperature is, for example, 50°C.

[0075] If the answer is YES in step S22, i.e., if the measured temperature Tb of the battery 15 is equal to or higher than the second target temperature, the calculation control unit 24 determines that the cooling capacity of the exterior cooling device 22 and the on-board cooling device 21 alone is not sufficient, and proceeds to step S23.

[0076] If the answer is NO in step S22, that is, if the measured temperature Tb of the battery 15 is not higher than the second target temperature, the calculation control unit 24 determines that the cooling capacity is sufficient by using the combined cooling of the on-board cooling device 21 and the external cooling device 22, and proceeds to step S18, where the battery 15 continues to be cooled by using the combined cooling of the external cooling device 22 and the on-board cooling device 21.

[0077] In step S23, the calculation control unit 24 transitions to the protective charging mode. That is, since the cooling capacity of the combined use of the external cooling device 22 and the in-vehicle cooling device 21 is insufficient, the amount of power supplied from the external charging device 25 to the battery 15 is reduced to lower the temperature of the battery 15.

[0078] In step S24, the arithmetic and control unit 24 executes a vehicle cooling mode in which the battery 15 is cooled using the vehicle-mounted cooling device 21 mounted on the vehicle.

[0079] In step S25, the calculation control unit 24 uses the charge detection unit 27 to determine whether the battery 15 requires charging.

[0080] If the answer is YES in step S25, that is, if the battery 15 needs charging, the calculation and control unit 24 proceeds to step S27 to charge the battery 15.

[0081] If the result of step S25 is NO, that is, if the battery 15 does not require charging, the calculation and control unit 24 proceeds to step S26.

[0082] In step S26, the calculation and control unit 24 ends the charging operation.

[0083] In step S27, the calculation control unit 24, while charging the battery 15, determines whether or not the measured temperature Tb of the battery 15 measured by the battery temperature detection unit 23 is equal to or higher than the above-mentioned second target temperature.

[0084] If the answer is YES in step S27, that is, if the measured temperature Tb of the battery 15 is equal to or higher than the second target temperature, the calculation control unit 24 determines that the cooling capacity of the in-vehicle cooling device 21 is insufficient, and proceeds to step S28.

[0085] If NO in step S27, that is, if the measured temperature Tb of the battery 15 is not equal to or higher than the second target temperature, the calculation control unit 24 returns to step S25.

[0086] In step S28, the calculation control unit 24 transitions to the protective charging mode. That is, since the cooling capacity of the in-vehicle cooling device 21 is insufficient, the amount of power supplied from the external charging device 25 to the battery 15 is reduced to lower the temperature of the battery 15.

[0087] The operation of the vehicle battery cooling device 16 has been described above.

[0088] The above-described embodiment can provide the following main effects.

[0089] According to the above-described embodiment, since the first fluid circuit 18 and the second fluid circuit 20 are independent fluid circuits, the first fluid circuit 18 and the second fluid circuit 20 can be used selectively to cool the battery 15 depending on the situation of the vehicle 10.

[0090] Furthermore, by disposing the second fluid circuit 20 between the battery 15 and the second fluid circuit 20, the space occupied by the fluid circuit can be reduced.

[0091] Furthermore, by arranging each of the first fluid circuit 18 and the second fluid circuit 20 close to the battery 15, the battery 15 can be cooled more directly by the first fluid circuit 18 and the second fluid circuit 20.

[0092] Furthermore, since the second cooling fluid 19 circulating through the second fluid circuit 20 is cooled by a cooling device arranged outside the vehicle 10, there is no need to install a cooling device for cooling the second fluid circuit 20 on the vehicle, thereby making it possible to reduce the weight of the vehicle.

[0093] Furthermore, when charging the battery 15, the battery 15 can be cooled more effectively by cooling the battery 15 with the first cooling fluid 17 and the second cooling fluid 19 in accordance with the detected temperature of the battery 15.

[0094] Although the embodiment of the present invention has been described above, the present invention is not limited to this, and modifications can be made without departing from the scope of the present invention. In addition, the above-described embodiments can be combined with each other.

[0095] For example, with reference to FIG. 3(A), the first fluid circuit 18 may be disposed below the second fluid circuit 20. The invention that can be understood from the above-described embodiment will be described below together with its effects. The vehicle battery cooling device according to claim 1 of the present invention is a vehicle battery cooling device for cooling a battery mounted on a vehicle, comprising a first fluid circuit through which a first cooling fluid flows to cool the battery when the vehicle is running, and a second fluid circuit through which a second cooling fluid flows to cool the battery when the battery is being charged, the first fluid circuit and the second fluid circuit being independent from each other. According to the present invention, since the first fluid circuit and the second fluid circuit are independent from each other, the first fluid circuit and the second fluid circuit can be selectively used to cool the battery depending on the vehicle situation. In addition, in the vehicle battery cooling device of the present invention, the first fluid circuit is disposed between the battery and the second fluid circuit. Furthermore, according to the present invention, by disposing the first fluid circuit between the battery and the second fluid circuit, the space occupied by the fluid circuits can be reduced. The present invention is also characterized in that the first fluid circuit and the second fluid circuit are each disposed close to the battery. According to the present invention, by disposing the first fluid circuit and the second fluid circuit close to the battery, the battery can be cooled more directly by the first fluid circuit and the second fluid circuit. In addition, the present invention is characterized in that the first cooling fluid flowing through the first fluid circuit is cooled by an on-board cooling device provided in the vehicle, and the second cooling fluid flowing through the second fluid circuit is cooled by an external cooling device arranged outside the vehicle. Furthermore, according to the present invention, since the second cooling fluid flowing through the second fluid circuit is cooled by a cooling device arranged outside the vehicle, there is no need to install a cooling device for cooling the second fluid circuit on the vehicle, and therefore the weight of the vehicle can be reduced. The present invention further includes a battery temperature detection unit that detects the temperature of the battery, and a calculation control unit, and the calculation control unit cools the battery with the second cooling fluid flowing through the second fluid circuit if the detected temperature of the battery detected by the battery temperature detection unit is lower than a target temperature when the battery is being charged, and cools the battery with the second cooling fluid flowing through the second fluid circuit and the first cooling fluid flowing through the first fluid circuit if the detected temperature of the battery detected by the battery temperature detection unit is higher than the target temperature. Furthermore, according to the present invention, the battery can be more effectively cooled by cooling the battery with the first cooling fluid and the second cooling fluid according to the detected temperature of the battery when charging the battery. [Explanation of symbols]

[0096] 10 Vehicles 11. Storage Space 12 Rear floor 13 Rear seat 14 Storage section 15 Battery 16 Vehicle battery cooling device 17 1st cooling fluid 18 1st fluid circuit 19 Second cooling fluid 20 Second fluid circuit 21 Onboard cooling system 22 External cooling system 23 Battery temperature detector 24 Calculation control unit 25 External charging device 26 Current supply circuit 27 Charging detection section 28 First biasing section 29 Second biasing section 30 First fluid path 31 Second fluid path 32 Current connection 33 Fluid Connection

Claims

1. A vehicle battery cooling device that cools a battery mounted in a vehicle, a first fluid circuit that is mounted on the vehicle and through which a first cooling fluid that cools the battery flows when the vehicle is running; a second fluid circuit that is mounted on the vehicle and through which a second cooling fluid that is a liquid that cools the battery when the battery is being charged flows; the first fluid circuit and the second fluid circuit are independent fluid circuits, the first fluid circuit has a first contact portion through which the first cooling fluid can flow and which covers a first surface of the battery; the second fluid circuit has an interior through which the second cooling fluid can flow and a second contact portion covering a second surface of the surface of the battery that is different from the first surface; while the vehicle is running, draining the second cooling fluid from the second fluid circuit; the first cooling fluid is a liquid; 2. A vehicle battery cooling device comprising: a first fluid circuit that is connected to a first cooling fluid circuit and a second fluid circuit that is connected to a second cooling fluid circuit;

2. 2. The vehicle battery cooling device according to claim 1, wherein the inside of the second fluid circuit is placed in a reduced pressure or vacuum state while the vehicle is running.

3. 2. The vehicle battery cooling device according to claim 1, wherein the inside of the first fluid circuit is placed in a reduced pressure or vacuum state while the battery is being charged.

4. 4. The vehicle battery cooling device according to claim 1, wherein an area of ​​the second surface covered by the second contact portion is larger than an area of ​​the first surface covered by the first contact portion.

5. 5. The vehicle battery cooling device according to claim 1, wherein the first surface is a bottom surface of the battery, and the second surface is a top surface and a side surface of the battery.

6. the first cooling fluid flowing through the first fluid circuit is cooled by an on-board cooling device provided in the vehicle, 6. The vehicle battery cooling device according to claim 1, wherein the second cooling fluid flowing through the second fluid circuit is cooled by an external cooling device disposed outside the vehicle.

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