JP7360271B2 - battery cooling system - Google Patents

Description

The present invention relates to a battery cooling system that cools a battery that generates heat due to charging.

An electric vehicle such as an electric vehicle or a plug-in hybrid vehicle is equipped with an electric motor as a drive source and a battery as a power source for driving the electric motor. Electric vehicles have an external charging function that charges a battery using an external power supply. Generally, as a power supply source, a household power outlet or a quick charging station installed in various facilities is used.

In recent years, contactless charging systems that do not use power cords or power transmission cables have been attracting attention as a method for charging batteries of electric vehicles. In a contactless charging system, power for charging a battery is wirelessly transmitted from a power supply coil installed on the ground or underground. A power receiving coil for receiving wirelessly transmitted power is installed in an electric vehicle. The power received by the power receiving coil is rectified from alternating current to direct current by a rectifier, and then supplied to the battery.

When charging with a non-contact charging system, not only the battery but also the power receiving coil generates heat. In order to prevent battery deterioration and the like, in a non-contact charging system, it is desirable to cool the battery during charging.

Japanese Unexamined Patent Publication No. 2016-226087 discloses a cooling system that includes a cooling unit that cools at least one of a power reception unit that receives power from a power transmission unit in a non-contact manner, and a power storage device that stores the power received by the power reception unit. has been done. Japanese Unexamined Patent Publication No. 2013-135572 discloses a cooling device that includes a cooling fan that cools a power receiving unit and a cooling fan that cools a power storage device that is charged by the power received by the power receiving unit.

JP2016-226087A Japanese Patent Application Publication No. 2013-135572

By the way, large capacity and high voltage batteries are used in electric vehicles. In order to mount such a battery, electric vehicles often adopt a layout in which the battery is installed so as to cover the underfloor of the electric vehicle. In this case, it is conceivable to install the power receiving coil in an area below the battery and partially overlap with the battery when viewed from a direction parallel to the height direction of the electric vehicle.

When the power receiving coil is installed below the battery as described above, if the power receiving coil generates heat during charging, a portion of the battery overlapping the power receiving coil will locally generate heat. Furthermore, in order to charge a battery using a non-contact charging system, it is necessary to overlap a power feeding coil and a power receiving coil. Therefore, if the power receiving coil is installed below the battery, the power feeding coil and battery will overlap during charging, and the part of the battery that overlaps the power feeding coil will locally generate heat due to the magnetic field generated from the power feeding coil. You may end up doing this. If the temperature inside the battery varies due to local heat generation in a part of the battery, a problem arises in that the battery deteriorates further.

In both the cooling system disclosed in JP-A-2016-226087 and the cooling device disclosed in JP-A-2013-135572, it is not possible to prevent variations in temperature within the battery that occur during charging.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a battery cooling system that can prevent variations in temperature within a battery that occur during charging.

A battery cooling system according to one aspect of the present invention includes a battery that drives a motor mounted on an electric vehicle, a non-contact charging device that charges the battery using power wirelessly transmitted by a power feeding coil, and a non-contact charging device that cools the battery. The contactless charging device includes a power receiving coil that receives the electric power, and at least a portion of the power receiving coil is directed from a first direction parallel to the height direction of the electric vehicle. The cooling device includes a cooler that cools the battery using a fluid, and a flow rate controller that controls the amount of the fluid, and the cooling device is arranged at a position that overlaps the battery when viewed from above. The flow controller includes a plurality of parts that overlap with the battery when viewed from one direction, the flow rate controller controls the amount of the fluid for each of the plurality of parts , and the cooler includes a plurality of parts that overlap the first battery. one or more first portions located at a position overlapping with the power receiving coil when viewed from the direction; and one or more first portions located at a position not overlapping with the power receiving coil when viewed from the first direction. 2, the flow rate controller changes the amount of the fluid in the first part based on a parameter that has a correspondence with the amount of heat generated by the power receiving coil when receiving the electric power; The non-contact charging device further includes a power meter that measures the amount of power, and the parameter is a measurement value of the power meter.
A battery cooling system according to another aspect of the present invention includes: a battery that drives a motor mounted on an electric vehicle; a non-contact charging device that charges the battery using power wirelessly transmitted by a power feeding coil; The contactless charging device includes a power receiving coil that receives the electric power, and at least a portion of the power receiving coil is arranged in a first direction parallel to the height direction of the electric vehicle. The cooling device is disposed at a position overlapping the battery when viewed from the direction, and includes a cooler that cools the battery using fluid, and a flow rate controller that controls the amount of the fluid, and the cooler includes: The power supply coil includes a plurality of parts that overlap with the battery when viewed from the first direction, the flow rate controller controls the amount of the fluid for each of the plurality of parts, and the power supply coil is installed on the ground or underground. , the cooling device further comprises: when the power receiving coil receives the electric power, each of the plurality of portions is a portion disposed at a position overlapping with the power feeding coil when viewed from the first direction; The flow rate controller includes a determination unit that determines whether or not the plurality of portions are overlapped portions, and the flow rate controller changes the amount of the fluid in each of the plurality of portions depending on whether or not the portions are overlapped portions.

According to the present invention, it is possible to provide a battery cooling system that can prevent variations in temperature within a battery that occur during charging.

1 is an explanatory diagram showing a schematic configuration of a vehicle equipped with a battery cooling system according to an embodiment of the present invention. It is a top view showing a cooler of a cooling device in one embodiment of the present invention. 3 is an explanatory diagram showing a portion of the cooler and a flow rate controller shown in FIG. 2. FIG. It is a functional block diagram showing a control unit of a cooling device in one embodiment of the present invention. It is an explanatory view for explaining an example of an overlap part in one embodiment of the present invention. It is an explanatory view for explaining another example of an overlap part in one embodiment of the present invention.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, with reference to FIG. 1, a general configuration of a vehicle 1 equipped with a battery cooling system 2 according to an embodiment of the present invention will be described. The vehicle 1 shown in FIG. 1 is an electric vehicle, particularly an electric vehicle equipped with a motor 3 as a drive source. The motor 3 is provided so as to be freely connected to a transmission (not shown), and drives drive wheels of the vehicle 1, for example, front wheels.

The vehicle 1 further includes a battery 4 that drives a motor 3 mounted on the vehicle 1. The battery 4 is installed so as to cover the underfloor of the vehicle 1. The battery 4 is connected to the motor 3 via, for example, an inverter (not shown). An inverter (not shown) converts the DC power of the battery 4 into AC power to drive the motor 3.

The vehicle 1 further includes, as a charging device for charging the battery 4, a wired charging device for charging the battery 4 using a power cord or a power transmission cable, and a wireless charging device for charging the battery 4 without using a power cord or a power transmission cable. Equipped with a charging device. The wired charging device uses, for example, a household power outlet or a quick charging stand installed in various facilities as a power supply source that supplies charging power to the battery 4 . In FIG. 1, a wired charging device is omitted.

Hereinafter, the wireless charging device will be referred to as a non-contact charging device 5. The non-contact charging device 5 uses an external power supply device 7 as a power supply source. The non-contact charging device 5 charges the battery 4 using the power wirelessly transmitted from the power supply device 7.

The non-contact charging device 5 and the power supply device 7 transmit and receive power using an electromagnetic induction method using a coil or a magnetic resonance method. The non-contact charging device 5 includes a power receiving coil 51 that receives power and a rectifier 53. The power feeding device 7 includes a power feeding device main body 71 and a power feeding coil 72 connected to the power feeding device main body 71. The feeding coil 72 is installed on the ground or underground. Power for charging the battery 4 is wirelessly transmitted by the power feeding coil 72.

Here, as shown in FIG. 1, the X direction, Y direction, and Z direction are defined. The X direction, Y direction, and Z direction are orthogonal to each other. The X direction is the traveling direction of the vehicle 1. The Y direction is one direction parallel to the vehicle width direction of the vehicle 1 (in FIG. 1, the direction from the back to the front). The Z direction is one direction parallel to the height direction of the vehicle 1 (in FIG. 1, the upward direction). Further, the direction opposite to the X direction is defined as the -X direction, the direction opposite to the Y direction is defined as the -Y direction, and the direction opposite to the Z direction is defined as the -Z direction.

Like the battery 4, the power receiving coil 51 is installed under the floor of the vehicle 1. Particularly in this embodiment, the power receiving coil 51 is arranged at a position where at least a portion thereof overlaps with the battery 4 when viewed from the first direction parallel to the height direction of the vehicle 1, that is, the Z direction. In the example shown in FIG. 1, the planar shape of the power receiving coil 51 is smaller than the planar shape of the battery 4, and the entire power receiving coil 51 is arranged at a position overlapping the battery 4 when viewed from the Z direction. Further, the power receiving coil 51 is arranged on the -Z direction side of the battery 4.

Transmission and reception of power between the power receiving coil 51 and the power feeding coil 72 is performed in a state where at least a portion of the power receiving coil 51 overlaps the power feeding coil 72 when viewed from the Z direction. In this state, power is transmitted and received by the power feeding device main body 71 passing current through the power feeding coil 72. The power received by the power receiving coil 51 is rectified from alternating current to direct current by a rectifier 53 and then supplied to the battery 4 .

The non-contact charging device 5 further includes a power measuring device 52 that measures the amount of power received by the power receiving coil 51. The power measuring device 52 is provided between the battery 4 and the rectifier 53, for example. In this case, the power measuring device 52 measures the amount of power by measuring the voltage and current of the transmission line connecting the battery 4 and the rectifier 53.

Vehicle 1 further includes a position detector 6 that directly or indirectly detects the position of power feeding coil 72. Note that the position of the power feeding coil 72 is a position relative to the vehicle 1. As the position detector 6, for example, a camera or a sensor that detects the feed coil 72 itself or a mark representing the position of the feed coil 72 is used. As the sensor, for example, a radar sensor or an optical sensor is used. In FIG. 1, the camera or sensor mentioned above is designated by the reference numeral 6.

The position detector 6 detects at least the position in the X direction and the position in the Y direction among the positions of the feeding coil 72. The position of the power feeding coil 72 in the Z direction, that is, the distance between the power feeding coil 72 and the power receiving coil 51 may be detected by the position detector 6, or may be detected by the power receiving coil 51 and the power measuring device 52. When the above-mentioned interval changes, the power received by the power receiving coil 51 changes. Therefore, by measuring the amount of power received by the power receiving coil 51 with the power measuring device 52, the above-mentioned interval can be detected. When detecting the above-mentioned interval using the receiving coil 51 and the power measuring device 52, position detection is performed to detect the position of the feeding coil 72 using the receiving coil 51, the power measuring device 52, and a camera or sensor denoted by reference numeral 6 in FIG. It can also be said that the vessel is composed of

Vehicle 1 further includes a cooling device 10 that cools battery 4. Cooling device 10 constitutes a main part of battery cooling system 2 according to this embodiment. In other words, the battery cooling system 2 includes the cooling device 10. The battery cooling system 2 further includes the aforementioned battery 4, a non-contact charging device 5, and a position detector 6.

The cooling device 10 includes a cooler 11 that cools the battery 4 using fluid, a flow controller 12 that controls the amount of fluid, and a control unit 13 that controls the flow controller 12. Note that the control unit 13 is shown in FIG. 4, which will be described later. The cooler 11 is arranged at a position overlapping the battery 4 when viewed from the Z direction. Further, the cooler 11 is arranged on the Z direction side of the battery 4. Note that although the battery 4 and the cooler 11 are depicted as separate bodies in FIG. 1, the battery 4 and the cooler 11 may be integrated.

The fluid that cools the battery 4 may be a liquid such as cooling water or a gas such as a specific gas. The battery 4 is cooled, for example, by circulating liquid or gas through piping arranged in the cooler 11. The flow rate controller 12 may include a solenoid valve that adjusts the flow rate of liquid or gas, and a flow rate sensor that measures the flow rate of liquid or gas.

Although not shown, the vehicle 1 further includes an EV control unit that controls the vehicle 1 as an electric vehicle, a charging control unit that controls charging of the battery 4, a battery management unit that is a device that monitors and controls the battery 4, and the vehicle 1. The vehicle 1 includes a plurality of electronic control units, such as a power steering control unit that controls the power steering device of the vehicle 1, and a brake control unit that controls the brake device of the vehicle 1. The plurality of electronic control units and the control unit 13 of the cooling device 10 are connected to each other by an in-vehicle network using CAN (Controller Area Network) communication or the like.

The plurality of electronic control units and the control unit 13 of the cooling device 10 are each mainly configured with a microcomputer including, for example, a CPU, ROM, and RAM. The ROM stores a control program for realizing operations set for each system. The above operations are realized by the CPU reading the control program from the ROM, loading it into the RAM, and executing it.

Next, the configuration of the cooler 11 will be described with reference to FIGS. 2 and 3. FIG. 2 is a plan view showing the cooler 11. FIG. 3 is an explanatory diagram showing a portion of the cooler 11 and the flow rate controller 12 shown in FIG. 2. In FIG. 1, the positions of the battery 4 and the power receiving coil 51 are indicated by broken lines.

As shown in FIG. 2, the cooler 11 includes a plurality of portions that overlap the battery 4 when viewed from the first direction, that is, the Z direction. In the example shown in FIG. 2, the cooler 11 has 16 rectangular parts 111, 112, 113, 114, 121, 122, 123, 124, 131, 132 arranged in a grid in the X direction and the Y direction. , 133, 134, 141, 142, 143, 144. Portions 111, 112, 113, and 114 are arranged in this order in the X direction. Portions 121, 122, 123, and 124 are located on the Y direction side of portions 111, 112, 113, and 114, respectively. Portions 131, 132, 133, and 134 are located on the Y direction side of portions 121, 122, 123, and 124, respectively. Portions 141, 142, 143, and 144 are located on the Y direction side of portions 131, 132, 133, and 134, respectively.

In addition, the cooler 11 includes a plurality of parts, including one or more first parts disposed at a position overlapping with the power receiving coil 51 when viewed from the Z direction, and one or more first parts located at a position not overlapping with the power receiving coil when viewed from the Z direction. one or more second portions arranged therein. In the example shown in FIG. 2, portions 122, 123, 132, and 133 correspond to the first portion, and portions 111 to 114, 121, 124, 131, 134, and 141 to 144 correspond to the second portion.

Note that the number of the plurality of parts may be greater or less than the example shown in FIG. 2. In either case, the plurality of parts are arranged so that one or more parts correspond to the first part and one or more parts correspond to the second part.

Here, any part among the parts 111 to 114, 121 to 124, 131 to 134, and 141 to 144 is expressed using the reference numeral 100. FIG. 3 shows the configuration of portion 100. Portion 100 is also a container that accommodates a portion of piping 101 that circulates fluid that cools battery 4 . The overall shape of the portion of the pipe 101 accommodated in the portion 100 is, for example, a meander shape.

The pipe 101 has a first end 101a and a second end 101b located at both ends in the longitudinal direction. The first and second ends 101a, 101b are connected to the flow controller 12. The fluid that cools the battery 4 flows in the pipe 101 from the first end 101 a to the second end 101 b and absorbs heat generated from the battery 4 . Thereby, the battery 4 is cooled. The cooling device 10 may further include a radiator that cools the fluid within the pipe 101. The radiator is attached to, for example, a portion of the piping 101 that is downstream (on the second end 101b side) of the portion accommodated in the portion 100.

Flow controller 12 controls the amount of fluid that cools battery 4 for each of the plurality of sections 100 of cooler 11 . A plurality of piping 101, a part of which is accommodated in each of the plurality of sections 100, are connected to the flow rate controller 12. The flow rate controller 12 controls the amount of fluid for each of the plurality of sections 100 of the cooler 11 by controlling the amount of fluid circulating through each of the plurality of pipes 101 .

Next, the operation of the flow rate controller 12 and the control unit 13 will be explained with reference to FIGS. 2 to 4. FIG. 4 is a functional block diagram showing the configuration of the control unit 13. The operation of the flow controller 12 is controlled by the control unit 13 of the cooling device 10.

As shown in FIG. 4, the control unit 13 includes a main control section 13A and a storage section 13B. The main control section 13A includes a determining section 14, a determining section 15, and a calculating section 16. The determining section 14, the determining section 15, and the calculating section 16 are realized, for example, by a CPU of a microcomputer that constitutes the control unit 13 reading a control program from a ROM of the microcomputer. The storage unit 13B is realized, for example, by the ROM of the above-mentioned microcomputer.

First, the operation of the determining section 14 will be explained. The determining unit 14 determines the amount of fluid in each of the plurality of sections 100 of the cooler 11, that is, the amount of fluid to be circulated through the piping 101. The flow rate controller 12 controls the amount of fluid that is circulated through the piping 101 for each of the plurality of sections 100 of the cooler 11 based on the determination result of the determination unit 14 .

For example, when the battery 4 is charged by the non-contact charging device 5, that is, when the power receiving coil 51 receives power to charge the battery, the flow rate controller 12 is arranged in a first portion located at a position overlapping with the power receiving coil 51. The amount of fluid in each of the corresponding portions 122, 123, 132, 133 (hereinafter referred to as the first flow rate) is calculated from the portions 111 to 114, 121, 124, 131, 134, 141 corresponding to the second portion. to 144 (hereinafter referred to as the second flow rate) or more. That is, when the power receiving coil 51 is receiving power for charging the battery, the determining unit 14 sets the first flow rate and the second flow rate so that the first flow rate is equal to or higher than the second flow rate. decide. In one example, the first flow rate is 15 L/min and the second flow rate is 10 L/min.

Further, the flow rate controller 12 changes the first flow rate based on a parameter that has a correspondence relationship with the amount of heat generated by the power receiving coil 51 when receiving electric power. That is, the determining unit 14 determines the first flow rate based on the above parameters. The above parameter is, for example, the amount of power received by the power receiving coil 51. The amount of electric power changes depending on the ratio of the remaining capacity to the fully charged capacity of the battery 4 (hereinafter simply referred to as remaining capacity), the positional deviation between the power receiving coil 51 and the power feeding coil 72, the specifications of the power feeding device 7, and the like. In particular, when the remaining capacity of the battery 4 is low or when the positional deviation between the power receiving coil 51 and the power feeding coil 72 is small, the amount of electric power increases; If the positional shift is large, the amount of electric power will be reduced.

When the amount of power received by the power receiving coil 51 increases, the amount of heat generated by the power receiving coil 51 also increases. Therefore, the determining unit 14 determines the first flow rate so that the first flow rate increases as the amount of electric power increases. As described above, the power measuring device 52 measures the amount of power. The determining unit 14 can determine the first flow rate using the measured value of the power measuring device 52. In one example, when the electric energy is 10 kW, the first flow rate is 20 L/min, when the electric energy is 7 kW, the first flow rate is 18 L/min, and when the electric energy is 3 kW, the first flow rate is 15 L/min. shall be.

The storage unit 13B may store a table showing the relationship between the electric energy and the first flow rate. In this case, the determining unit 14 determines the first flow rate using the measured value of the power measuring device 52 and the above table.

Note that the flow rate controller 12 may control the first flow rate and the second flow rate in accordance with a user's instruction input using an input device (not shown), or may control the first flow rate and the second flow rate based on the corresponding relationship with the amount of heat generated by the battery 4 during charging. The first flow rate and the second flow rate may be controlled based on parameters having. That is, the determining unit 14 may determine the first flow rate and the second flow rate according to the user's instructions, or may determine the first flow rate and the second flow rate based on the above-mentioned parameters. The above parameter is, for example, the remaining capacity or remaining life of the battery 4. For example, the determining unit 14 determines that when the remaining capacity of the battery 4 is low, the first flow rate and the second flow rate are increased, and when the remaining capacity of the battery 4 is large, the first flow rate and the second flow rate are increased. The first flow rate and the second flow rate may be determined such that the flow rate decreases.

Next, the operation of the determining section 15 and the operation of the determining section 14 related to the operation of the determining section 15 will be explained. When the battery 4 is charged by the non-contact charging device 5, that is, when the power receiving coil 51 receives power to charge the battery, at least a portion of the battery 4 overlaps the power feeding coil 72 when viewed from the Z direction. As a result, at least a portion of the cooler 11 also overlaps the power feeding coil 72. The determination unit 15 determines whether each of the plurality of portions 100 of the cooler 11 is an overlap portion, which is a portion disposed at a position overlapping the power feeding coil 72 when viewed from the Z direction, when the power receiving coil 51 receives power. Determine whether it exists or not.

The flow controller 12 changes the amount of fluid in each of the plurality of sections 100 of the cooler 11 depending on whether or not they are overlapping sections. That is, the determining unit 14 determines the amount of fluid in each of the plurality of portions 100 of the cooler 11 based on the determination result of the determining unit 15, depending on whether the portions are overlapping portions or not.

As described above, the position detector 6 detects the position of the feeding coil 72 in the X direction and the Y direction. The determining unit 15 uses the detection result of the position detector 6 to determine whether each of the plurality of portions 100 of the cooler 11 is an overlapping portion. FIG. 5 is an explanatory diagram for explaining an example of an overlapping portion. FIG. 6 is an explanatory diagram for explaining another example of the overlapping portion. In FIGS. 5 and 6, the position of the power feeding coil 72 is indicated by a broken line.

In the example shown in FIG. 5, all of the parts 111 to 114, 121 to 124, 131 to 134, and 141 to 144 of the cooler 11 correspond to the overlapping part. In this case, the determining unit 14 determines the amount of fluid assuming that there is no overlap, that is, the amount of fluid determined not based on the determination result of the determining unit 15 (hereinafter referred to as reference flow rate). The amount of fluid in each of the sections 111-114, 121-124, 131-134, and 141-144 is determined such that the amount of fluid is greater than .

In the example shown in FIG. 6, the parts 112 to 114, 122 to 124, and 132 to 134 of the cooler 11 correspond to the overlapping parts, and the parts 111, 121, 131, 141 to 144 of the cooler 11 correspond to the overlapping parts. Not applicable. In this case, the determining unit 14 determines the amount of fluid in each of the portions 112 to 114, 122 to 124, and 132 to 134 so that the amount is greater than the reference flow rate. Further, the determining unit 14 determines the amount of fluid in each of the portions 111, 121, 131, 141 to 144 so that the flow rate is equal to the reference flow rate.

As described above, portions 122, 123, 132, and 133 correspond to the first portion, and portions 111 to 114, 121, 124, 131, 134, and 141 to 144 correspond to the second portion. Hereinafter, the first flow rate when determined not based on the determination result of the determination unit 15 will be referred to as the first reference flow rate, and the second flow rate when determined not based on the determination result of the determination unit 15 will be referred to as the first flow rate. This is called a second reference flow rate. In the example shown in FIG. 5, the determining unit 14 determines the first flow rate to be greater than the first reference flow rate, and determines the second flow rate to be greater than the second reference flow rate. . In the example shown in FIG. 6, the determining unit 14 determines the first flow rate to be greater than the first reference flow rate, and determines the first flow rate to be greater than the second reference flow rate to the portions 112 to 114, A second flow rate in each of portions 111, 121, 131, 141-144 is determined to be equal to a second reference flow rate.

The first reference flow rate may be a fixed value, or may be determined based on any parameter such as the measured value of the power measuring device 52 as long as the condition that it is determined not based on the determination result of the determination unit 15 is satisfied. It may be a determined value. Similarly, the second reference flow rate may be a fixed value, or may be a value determined based on any parameter as long as it satisfies the condition that it is determined not based on the determination result of the determination unit 15. It's okay.

Next, the operation of the calculation section 16 and the operation of the determination section 14 related to the operation of the calculation section 16 will be explained. The position of the power feeding coil 72 may differ each time the battery 4 is charged by the non-contact charging device 5. As a result, the distance between the power feeding coil 72 and the power receiving coil 51 may also vary each time the battery 4 is charged by the non-contact charging device 5. The calculation unit 16 calculates the distance between the power feeding coil 72 and the power receiving coil 51 using the detection result of the position detector 6, specifically, the detection result of the position of the power feeding coil 72 in the Z direction.

The flow rate controller 12 changes the amount of fluid in the portion 100 determined by the determining portion 15 to correspond to the overlapping portion based on the interval calculated by the calculating portion 16 . That is, the determining unit 14 determines the amount of fluid in the portion determined to correspond to the overlapping portion based on the above-mentioned interval. Specifically, the determination unit 14 determines the amount of fluid in the portion determined to correspond to the overlapping portion so that the amount of fluid increases as the above-mentioned interval becomes smaller.

Next, the functions and effects of the battery cooling system 2 according to this embodiment will be explained. The battery cooling system 2 according to the present embodiment includes a non-contact charging device 5, and the battery 4 is charged using the power received by the power receiving coil 51. The power receiving coil 51 is arranged at a position where at least a portion thereof overlaps with the battery 4 when viewed from the Z direction. Since both the battery 4 and the power receiving coil 51 need to be installed under the floor of the vehicle 1, the distance between the battery 4 and the power receiving coil 51 becomes small. Therefore, when the power receiving coil 51 generates heat by receiving power wirelessly transmitted from the power feeding coil 72, a part of the battery 4 overlapping the power receiving coil 51 locally generates heat due to heat transfer from the power receiving coil 51, and As a result, the temperature inside the battery 4 varies.

In contrast, in the present embodiment, a cooler 11 including a plurality of portions 100 that overlap with the battery 4 when viewed from the Z direction, and a flow rate controller 12 that controls the amount of fluid for each of the plurality of portions 100 are provided. There is. According to this embodiment, by locally changing the amount of fluid, it is possible to prevent a portion of the battery 4 from locally generating heat. That is, according to the present embodiment, the first flow rate in the first part (parts 122, 123, 132, 133) arranged at a position overlapping with the power receiving coil 51 among the plurality of parts 100 of the cooler 11 of the plurality of parts 100 of the cooler 11, the second part (parts 111 to 114, 121, 124, 131, 134, 141 to 144) located at a position that does not overlap the power receiving coil 51 By making the flow rate larger than the flow rate, it is possible to suppress local heat generation in a part of the battery 4 overlapping the power receiving coil 51. Thereby, according to the present embodiment, it is possible to prevent variations in temperature within the battery 4 that occur during charging by the non-contact charging device 5. As a result, according to this embodiment, deterioration of the battery 4 can be prevented.

Further, in the present embodiment, the flow rate controller 12 changes the first flow rate based on a parameter that has a correspondence with the amount of heat generated by the power receiving coil 51 when receiving electric power. Thereby, according to the present embodiment, even if the amount of heat generated by the power receiving coil 51 fluctuates, it is possible to prevent the temperature inside the battery 4 from varying.

By the way, the battery 4 can generate heat not only by the power receiving coil 51 but also by the power feeding coil 72. That is, in order to charge the battery 4 with the non-contact charging device 5, it is necessary to overlap the power feeding coil 72 and the power receiving coil 51. In this embodiment, as described above, the power receiving coil 51 is arranged at a position where at least a portion thereof overlaps with the battery 4 when viewed from the Z direction. Therefore, when charging by the non-contact charging device 5, the power supply coil 72 and the battery 4 overlap, and as a result, the battery 4 generates heat due to the magnetic field generated from the power supply coil 72. In particular, if the power feeding coil 72 is deviated from the desired position, only a portion of the power feeding coil 72 and the battery 4 will overlap. In this case, a portion of the battery 4 that overlaps the power feeding coil 72 locally generates heat, and as a result, the temperature inside the battery 4 varies.

In contrast, in the present embodiment, the determining unit 15 determines whether each of the plurality of portions 100 of the cooler 11 is an overlapping portion arranged at a position overlapping the power feeding coil 72 when viewed from the Z direction. At the same time, the flow rate controller 12 changes the amount of fluid in each of the plurality of parts 100 depending on whether the parts 100 are overlapping parts or not. According to this embodiment, by increasing the amount of fluid in the overlapped portion so that it is greater than the reference flow rate, local heat generation in the part of the battery 4 that overlaps the power supply coil 72 is prevented. be able to.

Further, when the distance between the power feeding coil 72 and the power receiving coil 51 becomes smaller, the amount of heat generated in the part of the battery 4 that overlaps the power feeding coil 72 increases. In contrast, in the present embodiment, the calculation unit 16 calculates the interval between the power feeding coil 72 and the power receiving coil 51, and the flow rate controller 12 calculates the overlap distance based on the interval calculated by the calculation unit 16. Change the amount of fluid in a section. As a result, according to the present embodiment, even if the amount of heat generated in a part of the battery 4 changes due to a change in the above-mentioned interval, it is possible to prevent the temperature inside the battery 4 from varying. .

In addition, in this embodiment, changing the amount of fluid depending on whether it is the first part or the second part and changing the amount of fluid depending on whether it is an overlapping part are combined. be able to. Thereby, according to the present embodiment, it is possible to more effectively prevent a portion of the battery 4 from locally generating heat.

The present invention is not limited to the embodiments described above, and various changes and modifications can be made without departing from the gist of the present invention. For example, the battery cooling system of the present invention is applicable not only to electric vehicles equipped with only a motor as a drive source, but also to hybrid vehicles that use an engine and a motor as drive sources, and micro-hybrid vehicles that use a motor only for restarting the engine. It can also be applied to automobiles.

Furthermore, the battery cooling system of the present invention is capable of changing the amount of fluid depending on whether the part is the first part or the second part, and changing the amount of fluid depending on whether the part is an overlapping part. It may be configured to perform only one of the following.

DESCRIPTION OF SYMBOLS 1...Vehicle, 2...Battery cooling system, 3...Motor, 4...Battery, 5...Non-contact charging device, 6...Position detector, 7...Power supply device, 10...Cooling device, 11...Cooler, 12...Flow rate control 13... Control unit, 14, Determination section, 15... Judgment section, 16... Calculation section, 51... Power receiving coil, 52... Power measuring device, 53... Rectifier, 71... Power feeding device main body, 72... Power feeding coil.

Claims (5)

A battery that drives a motor installed in an electric vehicle,
a non-contact charging device that charges the battery using power wirelessly transmitted by a power feeding coil;
and a cooling device that cools the battery,
The contactless charging device includes a power receiving coil that receives the power,
The power receiving coil is arranged at a position where at least a portion thereof overlaps the battery when viewed from a first direction parallel to the height direction of the electric vehicle,
The cooling device includes a cooler that cools the battery using fluid, and a flow controller that controls the amount of the fluid,
The cooler includes a plurality of portions that overlap the battery when viewed from the first direction,
The flow rate controller controls the amount of the fluid for each of the plurality of parts,
The cooler includes, as the plurality of parts, one or more first parts arranged at a position overlapping with the power receiving coil when viewed from the first direction, and the power receiving coil when viewed from the first direction. and one or more second parts arranged at positions that do not overlap with the second part,
The flow rate controller changes the amount of the fluid in the first portion based on a parameter that has a correspondence relationship with the amount of heat generated by the power receiving coil when receiving the power,
The contactless charging device further includes a power meter that measures the amount of power,
A battery cooling system characterized in that the parameter is a measured value of the power measuring device . A battery that drives a motor installed in an electric vehicle,
a non-contact charging device that charges the battery using power wirelessly transmitted by a power feeding coil;
and a cooling device that cools the battery,
The contactless charging device includes a power receiving coil that receives the power,
The power receiving coil is arranged at a position where at least a portion thereof overlaps the battery when viewed from a first direction parallel to the height direction of the electric vehicle,
The cooling device includes a cooler that cools the battery using fluid, and a flow controller that controls the amount of the fluid,
The cooler includes a plurality of portions that overlap the battery when viewed from the first direction,
The flow rate controller controls the amount of the fluid for each of the plurality of parts,
The feeding coil is installed on the ground or underground,
The cooling device further includes an overlapping portion in which each of the plurality of portions is arranged at a position overlapping with the power feeding coil when viewed from the first direction when the power receiving coil receives the power. including a determination unit that determines whether or not it is a part;
The battery cooling system is characterized in that the flow rate controller changes the amount of the fluid in each of the plurality of parts depending on whether the parts are overlapped parts or not. Furthermore, it includes a position detector that detects the position of the feeding coil,
The battery cooling system according to claim 2 , wherein the determination unit determines each of the plurality of parts using a detection result of the position detector. The cooling device further includes a calculation unit that calculates an interval between the power feeding coil and the power receiving coil using the detection result of the position detector,
The battery cooling system according to claim 3 , wherein the flow rate controller changes the amount of the fluid in the overlapping portion based on the interval calculated by the calculation unit. The cooler includes, as the plurality of parts, a plurality of first parts arranged at positions overlapping with the power receiving coil when viewed from the first direction, and a plurality of first parts which are different from the power receiving coil when viewed from the first direction. 3. The battery cooling system according to claim 2 , further comprising a plurality of second portions arranged in non-overlapping positions.

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