Vehicles in motion

Abstract

In conventional vehicle cooling units, the placement of the fans can cause components to be unevenly distributed, making it difficult to maintain balance between the left and right sides and hindering the cooling effect of each component. [Solution] A vehicle is provided with two sets of cooling units 11, 15, each having radiators 11b, 15b and adjacent radiator fans 11a, 15a, the two sets of cooling units 11, 15 are arranged on the left and right sides of the vehicle body respectively, the left and right radiator fans 11a, 15a are arranged coaxially, and the airflow direction of the left and right radiator fans 11a, 15a is the same.

Description

Technical Field

[0001] The present invention relates to a traveling vehicle such as a lawn mower equipped with a cooling device.

Background Art

[0002] A configuration is known in which a plurality of radiators and radiator fans are arranged on one side of a pair of side surfaces of a vehicle body to perform cooling by blowing outside air (Patent Document 1). That is, the cooling device is mounted on a vehicle including vehicle components having a curved surface. This cooling device includes a radiator disposed on one side of a pair of side surfaces of the vehicle so as to face the curved surface of the vehicle component, and a radiator fan disposed between the radiator and the vehicle component for blowing outside air from the radiator to the curved surface.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, depending on the arrangement of the fans, the components may be unbalanced, making it difficult to achieve a balance between the left and right, and sometimes inhibiting the respective cooling effects.

[0005] In the present invention, in consideration of such problems of the conventional cooling device, an object is to provide a traveling vehicle that has a better balance of the vehicle body and can improve the cooling performance of the cooling device.

Means for Solving the Problems

[0006] The first aspect of the present invention is Two sets of cooling units each having a radiator and a radiator fan adjacent thereto are provided, The aforementioned two sets of cooling units are arranged on the left and right sides of the vehicle body, respectively, making it a vehicle capable of running.

[0007] This allows the same component to be placed on both the left and right sides, resulting in better balance between the left and right sides.

[0008] The second aspect of the present invention is: The first vehicle of the present invention has the aforementioned left and right radiator fans arranged coaxially.

[0009] Because they are positioned coaxially, the front-to-back balance is improved.

[0010] The third invention is, The second vehicle according to the present invention has the same airflow direction for the left and right radiator fans.

[0011] One fan generates airflow, which is then further dissipated by the other fan, improving the cooling effect. By aligning the airflow direction, the airflow from the radiator fans is streamlined within the aircraft, further improving cooling performance.

[0012] The fourth aspect of the present invention is: This is a third vehicle according to the present invention, wherein the mounting direction of the blades of the left and right radiator fans is reversed, and the rotation direction of the left and right radiator fans is reversed, so that the airflow direction is the same.

[0013] With a dual counter-rotating fan system, the swirling airflow generated by one fan is straightened by the other, resulting in a stronger, more linear airflow and improved cooling efficiency.

[0014] The fifth aspect of the present invention is: Equipped with a battery and a motor, The two sets of cooling units are a battery cooling unit and a motor cooling unit, and the vehicle is one of the first to fourth versions of the present invention.

[0015] Since the suitable temperatures for driving are different between the battery and the motor, temperature management can be performed separately for each.

[0016] The sixth invention is The blowing direction of the air-cooling fan of the motor cooling unit for the water-cooling circuit of the motor is from the outside to the inside of the vehicle body, and the blowing direction of the air-cooling fan of the battery cooling unit for the water temperature cooling circuit of the battery is from the inside to the outside of the vehicle body. This is the traveling vehicle of the fifth invention.

[0017] Since the cooling of the battery is mainly performed during charging, it is cooling in a state where the components that become hot inside the vehicle body have stopped. Therefore, there is no problem in cooling the radiator by sending the air inside the vehicle body, and there is no risk of sucking dust from the outside.

[0018] The seventh invention is The electric water pump for the water temperature cooling circuit of the battery is immediately behind the radiator of the battery cooling unit in the circuit and is physically located below the liquid level of the radiator. This is the traveling vehicle of the sixth invention.

[0019] [[ID=第十九]] The cooling water inside the core of the radiator naturally flows into the electric water pump by gravity, so that the suction of the electric water pump is stable, preventing air biting and preventing damage to the electric water pump and poor cooling.

[0020] The eighth invention is A heater is provided in the water temperature cooling circuit of the battery. The position of the heater in the circuit is immediately behind the electric water pump of the water temperature cooling circuit and immediately before the battery. The physical position of the heater is higher than the electric water pump of the water temperature cooling circuit and lower than the liquid level of the water jacket of the battery. This is the traveling vehicle of the seventh invention.

[0021] Due to the body structure, by arranging the components so that the cooling water rises from bottom to top, air biting can be prevented, and damage to the electric water pump and poor cooling can be prevented.

[0022] The ninth aspect of the present invention is comprising a first thermometer for detecting the temperature of the cooling water in the water cooling circuit of the motor, and a second thermometer for detecting the temperature of the parts of the motor Based on the detected temperatures of the first thermometer and the second thermometer, when driving the electric water pump in the water cooling circuit of the motor and the radiator fan of the cooling unit for the motor if the temperature of the first thermometer does not exceed the first threshold value, or the temperature of the second thermometer does not exceed the second threshold value, only drive the electric water pump in the water cooling circuit of the motor, and if the temperature of the first thermometer exceeds the first threshold value and the temperature of the second thermometer exceeds the second threshold value, the rotational speed of the electric water pump in the water cooling circuit of the motor is increased compared to before, and further drive the radiator fan of the cooling unit for the motor, which is a traveling vehicle according to the eighth aspect of the present invention

[0023] By not driving the radiator fan constantly, it leads to an improvement in electricity costs

[0024] The tenth aspect of the present invention is a cooling unit for the motor having a radiator and a radiator fan adjacent thereto, for cooling the water cooling circuit of the motor a cooling unit for the battery having a radiator and a radiator fan adjacent thereto, for cooling the water temperature cooling circuit of the battery, and comprising the cooling unit for the motor and the cooling unit for the battery are arranged on the same side surface of the traveling vehicle body the water cooling circuit of the motor and the water temperature cooling circuit of the battery are separate and independent the radiator for the motor and the radiator for the battery are separate and independent the radiator fan of the cooling unit for the motor and the radiator fan of the cooling unit for the battery are shared, which is a traveling vehicle

[0025] As long as the water channels and radiator are independent, cooling is possible even if the fan is shared, and sharing a fan can reduce the number of parts. [Brief explanation of the drawing]

[0026] [Figure 1] Side view of a lawnmower according to an embodiment of the present invention [Figure 2] Perspective view of the same lawnmower [Figure 3] Side view of the same lawnmower. [Figure 4] A diagram showing the water cooling circuit on the motor side of the lawnmower. [Figure 5] A diagram showing the configuration of the water temperature cooling circuit on the battery side of the lawnmower. [Figure 6] This diagram shows the configuration of the motor and battery of the lawnmower, focusing on the water cooling circuit and water temperature cooling circuit. [Figure 7] Perspective view of the same lawnmower [Figure 8] This diagram shows the configuration of the motor and battery of the lawnmower, focusing on the water cooling circuit and water temperature cooling circuit. [Figure 9] Perspective view of the same lawnmower [Figure 10] (A) Right-side perspective view of the lawnmower, (B) Left-side perspective view of the lawnmower, (C) Top view of the lawnmower [Figure 11] Front view of the same lawnmower. [Figure 12] Left side view of the same lawnmower. [Figure 13] Plan view of the same lawnmower [Figure 14] (A) Top view of the lawnmower, (B) Left side view of the lawnmower, (C) Right side view of the lawnmower [Figure 15] Plan view of the same lawnmower [Figure 16] A diagram showing the configuration of the water temperature cooling circuit on the battery side of the lawnmower. [Figure 17] Right side view of the same lawnmower. [Figure 18] Right side view of the same lawnmower. [Figure 19] Perspective view of the heater of the same lawnmower. [Figure 20] Right side view of the same lawnmower. [Figure 21] Perspective view of the radiator of the same lawnmower. [Modes for carrying out the invention]

[0027] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0028] Figure 1 is a right side view of a lawnmower, which is an example of a vehicle according to an embodiment of the present invention. Hereafter, the front and rear and left and right will be defined as the direction of travel of the lawnmower.

[0029] In Figure 1, this lawnmower is equipped with front wheels 2 and rear wheels 3, and has a front mower 4 mounted on the front. 5 is a container for storing the grass cut by the front mower 4.

[0030] The vehicle body 1 is electrically powered, and a battery 6 for storing electricity is located below the container 5 at the rear of the vehicle body, as shown in Figure 2. It is also equipped with one or more motors 7 (7a, 7b) that are driven using the power from the battery 6, and these motors 7 drive the running gear (front wheels 2, rear wheels 3) and one or more work outputs (PTO, etc.).

[0031] Furthermore, it includes a DC-DC converter 8a for transforming the power of the battery 6, an on-board charger 8b for charging the battery 6, an inverter for converting the power of the battery 6 to drive the motor 7, a water cooling circuit 9 for cooling the motor, DC-DC converter 8a, on-board charger 8b, and inverter, and a water temperature cooling circuit 10 for cooling and heating the battery 6.

[0032] By cooling Battery-6 when it is hot and heating it when it is cold, the temperature of Battery-6 can be maintained within a certain range in which it can operate safely, thereby improving the lifespan and safety of Battery-6.

[0033] As shown in Figure 3, cooling and heating of the battery-6 are performed by circulating cold water and hot water inside the water jacket 6a provided in the battery-6. Methods of cooling or heating the battery-6 by directly blowing air on it have disadvantages such as moisture entering the battery pack due to outside air inflow, condensation, and dust accumulation, and are not suitable for agricultural machinery with a lot of dust, so the method of circulating cold water and hot water is effective.

[0034] Figure 4 is a system diagram for cooling the motor 7. Figure 5 is a system diagram for cooling or heating the battery 6. The water cooling circuit 9 for cooling the motor 7 and the water temperature cooling circuit 10 for the battery 6 are separate water channels. This is because components other than the battery 6, such as the motor 7, generate relatively more heat and have higher heat resistance than the battery 6. If the water flowing from the motor 7 side were to flow to the battery 6, it could actually raise the temperature of the battery 6 when it needs cooling.

[0035] This allows the water temperature cooling circuit 10 of the battery-6 to separately manage the water temperature flowing to the water cooling circuit including the motor 7, adjusting each to an appropriate temperature range and ensuring safe machine operation.

[0036] In Figure 4, the motor 7 side of the motor water cooling circuit 9 has a converter 8 having a DC-DC converter 8a and a charger 8b, a drive motor 7a, a controller 7a1 for the drive motor 7a, a PTO motor 7b, and a controller 7b1 for the PTO motor 7b arranged in series or in parallel. 14 is a second thermometer for detecting the temperature of these components.

[0037] On the other hand, a motor cooling unit 11 is located on the opposite side of the motor water cooling circuit 9. This motor cooling unit 11 has a radiator 11b through which water flows, and a motor radiator fan 11a located very close to it.

[0038] An electric water pump (EWP) 12 is located immediately downstream of the radiator 11b. Also, a first thermometer 13 for detecting the temperature of the flowing water is located immediately upstream of the radiator 11b.

[0039] Furthermore, in Figure 5, a battery cooling unit 15 is positioned on the opposite side of the water temperature cooling circuit 10 for the battery 6 from the battery 6. This battery cooling unit 15 has a radiator 15b through which water flows, and a battery radiator fan 15a positioned very close to it.

[0040] An electric water pump 16 is located immediately downstream of the radiator 15b. A third thermometer 17 for detecting the temperature of the flowing water is located immediately upstream of the radiator 15b. Furthermore, a heater 18 is located downstream of the electric water pump 16.

[0041] Thus, the radiator 15b of the water temperature cooling circuit 10 for battery-6 is a separate radiator from the radiator 11b of the water cooling circuit 9 that includes motor 7.

[0042] Figure 6 shows a modified example of the embodiments in Figures 4 and 5, in which the radiator fan 15a of the water temperature cooling circuit 10 of the battery cooling unit 15 and the radiator fan 11a of the water cooling circuit 9 of the motor cooling unit 11 are shared. Cooling is possible even if the fans are shared, as long as the water passages and radiators are independent, and sharing has the advantage of reducing the number of parts. As will be described later, this can be easily achieved by arranging the cooling units on the same side of the vehicle body.

[0043] In that case, as shown in Figure 7, the fan's airflow direction is normally from outside the unit towards the inside, but it is desirable that its rotation direction be reversed so that it can stick to the area around the fan and blow away dust. The cooling capacity can be restored by reversing the rotation.

[0044] Figures 8 and 9 show that the radiator fan 15a of the water temperature cooling circuit 10 for the battery cooling unit 15 and the radiator fan 11a of the water cooling circuit 9 for the motor cooling unit 11 are not shared but are independent. By providing separate fans, each can be controlled to an appropriate temperature.

[0045] Furthermore, as shown in Figure 9, when the radiator fan 15a of the water temperature cooling circuit 10 of the battery cooling unit 15 and the radiator fan 11a of the water cooling circuit 9 of the motor cooling unit 11 are made independent, the motor cooling unit 11 is placed on the side of the vehicle, the battery cooling unit 15 is placed on the same side, and the airflow direction of each fan is made the same. Depending on the placement of the fans, they may interfere with each other's cooling, but with this configuration, the total airflow when the fans are operated simultaneously is about twice that of when there is only one fan, resulting in a high cooling effect.

[0046] Next, another embodiment of the present invention will be described.

[0047] In Figures 10(A), (B), and (C), in a configuration where the motor cooling unit 11 is independent of the battery cooling unit 15, the motor cooling unit 11 is placed on one side of the vehicle body, and the battery cooling unit 15 is placed on the opposite side. This balances the left and right sides and improves the stability of the vehicle body.

[0048] Furthermore, as shown in Figures 11 and 12, the two fans are arranged coaxially. In other words, if the axes are different, turbulence will occur and the cooling effect will not be constant, but by arranging them coaxially, the airflow from the two fans is straightened inside the machine, making it less likely for heat to build up inside.

[0049] Furthermore, as shown in Figure 13, the airflow direction of the two fans is made the same. In other words, if the fan airflow directions are opposite each other, the air will not flow properly and heat will build up inside the machine. However, by making them the same direction, the air generated by one fan will be further blown out by the other fan, improving the cooling effect.

[0050] Furthermore, as shown in Figures 14(A), (B), and (C), even when the airflow direction is the same, it is desirable to reverse the rotation directions of the two fans. In other words, when the rotation directions of the fans are the same, the swirling flow generated by one fan is further amplified by the other fan, causing the air to diffuse and reducing the cooling effect. However, by reversing the rotation directions of the fans, a counter-rotating fan system is created, where the swirling flow generated by one fan is straightened by the other fan, resulting in a stronger, more linear airflow and improved cooling. To achieve this, the mounting direction of the fan blades should be reversed. That is, when viewing the fan from above, the inclination of one blade is upward to the right, while the inclination of the other blade is downward to the right.

[0051] Figure 15 shows a further specific example, where it is desirable that the fan of the motor cooling unit 11 blows air from outside to inside the machine, and the fan of the battery cooling unit 15 blows air from inside to outside the machine. In other words, during normal operation, heat tends to build up inside the machine, so directing the internal airflow onto the radiator 11b of the motor cooling unit 11 will not provide an effective cooling effect. Therefore, since the battery 6 is mainly cooled during charging, and the high-temperature components inside the machine are stopped, there is no problem in blowing air from inside the machine to cool the radiator, and no dust is drawn in from the outside.

[0052] Next, the water temperature cooling circuit 10 for the battery 6 and the battery cooling unit 15 will be described in more detail.

[0053] As shown above in Figure 5, the water temperature cooling circuit 10 of the battery 6 is equipped with a heater 18 that warms the water flowing through it. In other words, although the battery life is significantly reduced at sub-zero temperatures, the heater 18 makes it possible to operate the machine and charge the battery even at sub-zero temperatures.

[0054] Furthermore, the water in this water temperature cooling circuit 10 is circulated by an electric water pump 16. In other words, the battery 6 and other components installed in electric vehicles are high-voltage components and are vulnerable to both cold and heat, requiring use within a more limited temperature range. In particular, high current flows through the battery during rapid charging, necessitating cooling, while below freezing temperatures, they cannot be used without heating to raise their temperature. However, by varying the temperature of the water, which is easy to manage, using the electric water pump 16, the temperature of the battery 6 can be indirectly controlled, and dust resistance is also improved.

[0055] As shown in Figure 16, for such temperature control, battery-6 is equipped with a fourth thermometer 19 for detecting the temperature of battery-6. Cooling and heating can be controlled according to the temperature conditions to efficiently maintain the temperature of battery-6 at an appropriate level.

[0056] Furthermore, as shown in Figure 16, the water temperature cooling circuit 10 of the battery cooling unit 15 is equipped with at least one third thermometer 17 for measuring the temperature of the cooling water.

[0057] Furthermore, as shown in Figure 16, the airflow of the radiator fan 15a is variable, allowing the airflow to be changed according to the temperature of each part. The airflow can be changed by simply switching it on or off, or by changing the fan speed in an analog manner. Cooling and heating can be controlled according to the temperature conditions, allowing the battery temperature to be maintained efficiently.

[0058] Furthermore, in Figure 16, the flow rate of the electric water pump 16 is variable, and the flow rate is changed according to the temperature of each part. The flow rate can be changed by simple on / off or analog adjustment. Cooling and heating can be controlled according to the temperature conditions, and the battery temperature can be maintained efficiently.

[0059] Furthermore, in Figure 16, the heat output of the heater 18 is variable, and the heat output is changed according to the temperature of each part. The heat output can be changed by simple on / off or analog adjustment. Cooling and heating can be controlled according to the temperature conditions to efficiently maintain the battery temperature.

[0060] Furthermore, in Figure 16, in the water temperature cooling circuit 10 for the battery, the position of the electric water pump 16 in the circuit is immediately behind the radiator 15b of the battery cooling unit 15.

[0061] Furthermore, as shown in Figure 17, in the water temperature cooling circuit 10 for the battery, the physical position of the electric water pump (EWP) 16 is set below the liquid level 15b1 of the radiator 15b. By doing so, the coolant inside the core of the radiator 15b flows naturally into the electric water pump 16 due to gravity, stabilizing the suction of the electric water pump 16, preventing air from getting trapped, and thus preventing damage to the electric water pump 16 and cooling failure.

[0062] Furthermore, as shown in Figure 16, the heater 18 of the water temperature cooling circuit 10 is positioned between the electric water pump 16 and the battery 6, preferably immediately after the electric water pump 16 and immediately before the battery 6. This ensures that the battery 6 is immediately after the hot water heated by the heater 18, allowing the battery 6 to be heated quickly and without loss.

[0063] Furthermore, as shown in Figure 18, the physical position of the heater 18 is higher than the electric water pump 16 and lower than the water level 6a1 of the water jacket 6a of the battery 6. This arrangement prevents air from getting trapped in the circuit, as the cooling water rises from bottom to top, rather than from front to back in the aircraft configuration, thus preventing damage to the electric water pump 16 and cooling failures. Figure 19 is a perspective view of the heater 18.

[0064] Furthermore, as shown in Figures 20 and 21, the pressure cap 15b2 of the radiator 15b is positioned higher than the water level 6a1 of the water jacket 6a of the battery 6.

[0065] Next, we will explain the temperature control on the motor 7 side using Figure 4.

[0066] The water cooling circuit 9 is equipped with a variable-speed electric water pump 12 and a radiator fan 11a. The electric water pump 12 and the radiator fan 11a are driven according to the temperature of the coolant and each component to cool the coolant and each component. Here, the temperature of the coolant is detected by a first thermometer 13, and the temperature of each component is detected by a second thermometer 14.

[0067] In this case, when driving the electric water pump 12 and radiator fan 11a based on the temperatures detected by a first thermometer 13 that detects the temperature of the coolant in the water cooling circuit 9 of the motor 7 and a second thermometer 14 that detects the temperature of each component of the motor 7, if the temperature of the first thermometer 13 does not exceed a first threshold, or if the temperature of the second thermometer 14 does not exceed a second threshold, only the electric water pump 12 is driven. If the temperature of the first thermometer 13 exceeds the first threshold and the temperature of the second thermometer 14 exceeds the second threshold, the rotation speed of the electric water pump 12 is increased, and the radiator fan 11a is also driven. In other words, unlike vehicles that use an engine, electric motors do not constantly become hot, so there is no need to drive the radiator fan 11a to cool them except when the coolant and components are hot. With this configuration, not constantly driving the radiator fan 11a leads to improved energy efficiency. Furthermore, if there are multiple second thermometers 14, there may be multiple second thresholds for each second thermometer 14, or there may be a single threshold for the average value of the temperatures detected by the second thermometer 14.

[0068] As another variation, the rotation speed of the electric water pump 12 is set to 0 under cryogenic conditions. In other words, if the electric water pump 12 is driven in a cryogenic environment where the coolant freezes, there is a risk of damage to the parts, and if the parts are damaged, there is a possibility of leakage after the coolant thaws and electric shock. The above configuration protects the parts and prevents electric shock.

[0069] As another variation, the high-temperature conditions can be divided into multiple stages. In the first stage of high-temperature conditions, only the rotational speed of the electric water pump 12 is increased, and in the next stage of high-temperature conditions, the radiator fan 11a is driven. In other words, since the power consumption of the radiator fan 11a is greater than that of the electric water pump 12, driving the radiator fan 11a and increasing the rotational speed of the electric water pump 12 under the same conditions may result in excessive power consumption. Therefore, the above configuration allows for sufficient cooling while reducing power consumption.

[0070] As an alternative, a radiator fan 11a with adjustable airflow may be used, and the airflow may be adjusted in proportion to the temperature rise. This provides a further gradient of cooling levels, enabling more sufficient cooling and leading to a reduction in power consumption.

[0071] As another variation, a radiator fan 11a with adjustable airflow may be used. Under the initial high-temperature conditions, the rotation speed of the electric water pump 12 may be increased, then under the next high-temperature conditions, the radiator fan 11a may be driven at a low speed, and then under the following high-temperature conditions, the radiator fan 11a may be driven at a high speed. This provides a further gradient of cooling levels, enabling more than sufficient cooling and leading to a reduction in power consumption.

[0072] As an alternative, the electric work machine may have multiple modes with different output levels, such as ECO mode, Middle mode, and Boost mode. In ECO mode, which reduces output, the high-temperature conditions may be set higher than in other modes. In other words, in modes that reduce output, the temperature at which saturation occurs during operation is relatively low, and the temperature rise is expected to be smaller than in other modes. Therefore, there is no need to perform cooling under the same high-temperature conditions. Thus, with the above configuration, power consumption can be reduced by performing sufficient cooling.

[0073] As an alternative, the electric work machine may have multiple modes with different output levels, such as ECO mode, Middle mode, and Boost mode. In Boost mode, which increases the output, the high-temperature conditions may be set lower than in the other modes. Since the temperature rise during operation is expected to be relatively large in the modes that increase the output, it is necessary to detect the temperature rise earlier and cool the machine compared to the other modes. With the above configuration, sufficient cooling can be performed for each mode.

[0074] The vehicle used in this invention is not limited to the lawnmower described above, but may also be other vehicles such as an electric tractor. [Industrial applicability]

[0075] This invention provides a vehicle with improved body balance and enhanced cooling performance, making it ideal for lawnmowers. [Explanation of Symbols]

[0076] 1. Vehicles in operation 2 Front wheels 3 Rear wheels 4 Front Mower 5 containers 6 batteries 6a Water Jacket 6a1 Water level 7 Motor 7a Motor for driving 7a1 Motor controller for driving 7b PTO motor 7b1 PTO Motor Controller 8 Converters 8a converter 8b charger 9 Water cooling circuit 10 Water temperature cooling circuit 11. Motor cooling unit 11a Radiator Fan 11b Radiator 12 Electric Water Pump 13. First thermometer 14. Second thermometer 15 Battery cooling unit 15a radiator fan 15b Radiator 15b1 Liquid level 15b2 Cap 16 Electric Water Pump 17 Third thermometer 18 Heater 19 4th thermometer

Claims

1. Two sets of cooling units are provided, each having a radiator and an adjacent radiator fan. The vehicle is characterized in that the two sets of cooling units are arranged on both the left and right sides of the vehicle body.

2. The vehicle according to claim 1, wherein the left and right radiator fans are arranged coaxially.

3. The vehicle according to claim 2, wherein the airflow direction of the left and right radiator fans is the same.

4. The vehicle according to claim 3, wherein the mounting direction of the blades of the left and right radiator fans is reversed, and the rotation direction of the left and right radiator fans is reversed, so that the airflow direction is the same.

5. Equipped with a battery and a motor, The vehicle according to any one of claims 1 to 4, wherein the two sets of cooling units are a cooling unit for the battery and a cooling unit for the motor.

6. The vehicle according to claim 5, wherein the airflow direction of the motor cooling unit's cooling fan for the motor's water cooling circuit is directed from outside the vehicle to inside, and the airflow direction of the battery cooling unit's cooling fan for the battery's water temperature cooling circuit is directed from inside the vehicle to outside.

7. The electric water pump for the battery water temperature cooling circuit is located on the circuit immediately after the radiator of the battery cooling unit, and is physically located below the liquid level of the radiator, according to claim 6.

8. A heater is provided in the water temperature cooling circuit of the battery, and the position of the heater in the circuit is immediately after the electric water pump of the water temperature cooling circuit and immediately before the battery. The vehicle according to claim 7, wherein the physical position of the heater is higher than the electric water pump of the water temperature cooling circuit and lower than the fluid level of the water jacket of the battery.

9. The system includes a first thermometer for detecting the temperature of the cooling water in the motor's water cooling circuit, and a second thermometer for detecting the temperature of the motor's components. When driving the electric water pump of the motor's water cooling circuit and the radiator fan of the cooling unit for the motor based on the temperatures detected by the first thermometer and the second thermometer, The vehicle according to claim 8, wherein if the temperature of the first thermometer does not exceed a first threshold, or if the temperature of the second thermometer does not exceed a second threshold, only the electric water pump of the motor's water cooling circuit is driven; and if the temperature of the first thermometer exceeds a first threshold and the temperature of the second thermometer exceeds a second threshold, the rotational speed of the electric water pump of the motor's water cooling circuit is increased, and the radiator fan of the cooling unit for the motor is also driven.

10. A motor cooling unit having a radiator and an adjacent radiator fan, which cools the motor's water cooling circuit, It comprises a battery cooling unit having a radiator and an adjacent radiator fan, which cools the battery's water temperature cooling circuit, The motor cooling unit and the battery cooling unit are located on the same side of the vehicle body. The motor's water cooling circuit and the battery's water temperature cooling circuit are separate and independent of each other. The radiator for the motor and the radiator for the battery are separate and independent of each other. A vehicle in which the radiator fan of the motor cooling unit and the radiator fan of the battery cooling unit are shared.

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