WO2012147128A1

WO2012147128A1 - Vehicle power source and vehicle

Info

Publication number: WO2012147128A1
Application number: PCT/JP2011/002459
Authority: WO
Inventors: 崇村田
Original assignee: トヨタ自動車株式会社
Priority date: 2011-04-26
Filing date: 2011-04-26
Publication date: 2012-11-01

Abstract

[Problem] To ensure necessary battery output while keeping down energy consumed when the battery temperature rises. [Solution] This vehicle power source is provided with: multiple battery groups each having multiple unit batteries; multiple holding members which are spaced apart from each other, hold each of the aforementioned battery groups, and allow heat exchange between the unit batteries in each battery group; and a heating unit for selectively heating a portion of the battery groups.

Description

Power supply device for vehicle and vehicle

The present invention relates to a cell temperature rising technique in a power supply device.

Hybrid vehicles, electric vehicles, and the like using a battery composed of a plurality of single cells such as lithium ion batteries as a power source are known. The internal resistance of the cell varies with temperature. FIG. 7 is an internal resistance-temperature characteristic diagram showing the relationship between the battery temperature and the internal resistance of the unit cell. Referring to the figure, there is a correlation between the internal resistance and the battery temperature, and the internal resistance increases as the battery temperature decreases. In particular, in the cryogenic region, the internal resistance of the unit cell becomes extremely high.

∙ When the internal resistance of the cell increases, the input / output current value is limited. For this reason, there is a possibility that a necessary battery output cannot be obtained. Moreover, there is a possibility that the energy generated when the vehicle is braked cannot be collected in the battery as regenerative energy. In this case, since the brake of the vehicle is switched to the mechanical brake, the energy at the time of braking is lost as heat energy, and the energy efficiency is lowered.

Patent Document 1 has a housing having an inlet and an outlet, in which a unit battery is installed, and a portion exposed to a flow path of a heat transfer medium formed in the housing, and is in contact with the unit battery. Disclosed is a temperature control system for a secondary battery module, including a heat transfer member that adjusts the temperature of a unit battery that is installed on the heat transfer member.

JP 2006-093155 A

However, since the configuration of Patent Document 1 is a configuration in which all of the plurality of unit cells are uniformly heated, energy consumption during temperature adjustment increases. Therefore, the present invention has an object of ensuring a necessary battery output while suppressing power consumption when the battery temperature rises.

In order to solve the above-described problems, a power supply device for a vehicle according to the present invention includes (1) a plurality of battery groups each including a plurality of single cells, and a plurality of holding members that respectively hold the battery groups. In addition, the plurality of holding members that allow heat exchange between the single cells in each of the battery groups and are spaced apart from each other and a part of the battery groups among the plurality of battery groups are selectively heated. And a heating unit.

(2) In the configuration of (1), the plurality of battery groups include a first battery group and a second battery group, and the plurality of holding members hold the first battery group. The heating unit includes a first holding member and a second holding member that holds the second battery group, and the heating unit selects one of the first battery group and the second battery group. Can be heated. According to the configuration of (2), since only one of the first battery group and the second battery group is heated, compared to the case of heating the entire first battery group and the second battery group. However, the power consumption when the battery temperature rises is reduced.

(3) In the configuration of (2) above, the heating unit can alternately switch the heating target between the first battery group and the second battery group. According to the configuration of (3), since only one of the battery groups can be prevented from being heated intensively, the variation in the degree of deterioration of the single cells included in the first battery group and the second battery group is suppressed. it can.

(4) In the configuration of (3) above, all the single cells included in the power supply device can be connected in parallel. According to the configuration of (4), it is possible to suppress the circulation current exceeding the allowable upper limit value from flowing into the unit cell having a high degree of deterioration by suppressing the variation in the degree of deterioration.

(5) In the configurations of (1) to (4), the unit cells have a cylindrical shape, and all the unit cells included in the power supply device are arranged in a plane including the radial direction of the unit cells. Can do. According to the structure of (5), in addition to the said effect, a power supply device can be reduced in size in the longitudinal direction of this cell.

(6) In the configurations of (1) to (5) above, the apparatus has a temperature information acquisition unit that acquires information about the temperature of the power supply device, and the heating unit has a temperature acquired by the temperature information acquisition unit equal to or less than a threshold Only in this case, the part of the battery group is selectively heated. According to the configuration of (6), since the heating unit is driven based on the temperature information of the power supply device, it is possible to accurately specify the situation where the temperature increase is required. Thereby, power consumption is more effectively reduced.

(7) In the above configurations (1) to (6), the heating unit includes a plurality of heaters respectively disposed on the holding members, and a controller that controls driving of the heaters. According to the configuration of (7), it is possible to achieve both suppression of power consumption at the time of battery temperature rise and securing necessary battery output with a simple configuration.

(8) The power supply devices (1) to (7) can be mounted on hybrid vehicles and electric vehicles. In particular, these power supply devices can be used as a power source for a motor that drives a vehicle.

According to the present invention, necessary battery output can be ensured while suppressing power consumption when the battery temperature rises.

It is a disassembled perspective view of the power supply device for vehicles. It is sectional drawing of an assembled battery. It is a functional block diagram of a heating unit. It is the flowchart which showed the drive method of the heater. 10 is a cross-sectional view of an assembled battery according to modification example 1. 10 is a cross-sectional view of an assembled battery according to Modification 4. FIG. 4 is an internal resistance-temperature characteristic diagram showing a relationship between battery temperature and internal resistance of a single cell.

(Embodiment 1)
A power supply device for a vehicle according to the present embodiment will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the power supply device. FIG. 2 is a cross-sectional view of the assembled battery taken along the YZ plane. The power supply device 1 includes an assembled battery 10, a case 20, and a bus bar 40. The power supply device 1 can be used as a vehicle battery. The assembled battery 10 includes a first battery group 11 and a second battery group 12 positioned below the first battery group 11. The first battery group 11 includes a plurality of unit cells 111. The single battery 111 may be a secondary battery such as a lithium ion battery or a nickel metal hydride battery. The unit cell 111 is formed in a cylindrical shape, and includes a positive electrode terminal 112 and a gas release valve 114 at one end portion in the longitudinal direction, and a negative electrode terminal (not shown) at the other end portion in the longitudinal direction. The plurality of unit cells 111 are arranged in the radial direction of the unit cells 111 in a state where end portions in the longitudinal direction are aligned. That is, the plurality of unit cells 111 are arranged in a plane including the radial direction of the unit cells 111. Second battery group 12 includes a plurality of single cells 111. The configuration of the unit cells 111 in the second battery group 12 is the same as that of the first battery group 11.

The single cells 111 of the first battery group 11 and the second battery group 12 are connected in parallel by the bus bar 40. In FIG. 1, only the bus bar 40 connected to the negative terminal is shown, and the bus bar connected to the positive terminal 112 is omitted. The bus bar 40 is formed with a plurality of welds 41 to which the negative terminals of the single cells 111 are welded. The welded portion 41 is configured to be elastically deformable in the X-axis direction. Thereby, the dimensional error of each cell 111 can be absorbed.

The first battery group 11 is held by the first holding member 31. The first holding member 31 includes a plurality of openings for holding each unit cell 111 and holds the outer surface of each unit cell 111 in the radial direction. The first heater 61 is located on the upper surface of the first holding member 31. When the first heater 61 starts the heating operation, the temperature of the first holding member 31 increases. The first holding member 31 is a solid plate-like member, and transfers the heat flowing from the first heater 61 to each unit cell 111 held by the first holding member 31. As a result, the temperature of the first battery group 11 whose temperature has decreased is increased as a whole, and the battery output can be increased. Note that the first holding member may be a metal. The metal may be aluminum, copper, or iron.

The first heater 61 may be a cement-type resistor. The cement-type resistor includes a resistor housing case and a resistor housed in the resistor housing case. The resistor housing case is filled with a cement material. The resistor may be a bent metal plate. The metal plate may be an alloy containing copper and nickel. The resistor housing case may be ceramic. The ceramic may include alumina to increase thermal conductivity. The cement material may be a pasty insulating sealing material containing alumina powder or silica powder. The first heater 61 may be a PTC (Positive Temperature Coefficient) heater or a Peltier heater using a Peltier element.

A gas guide portion 31 </ b> A is formed on the upper surface of the first holding member 31 at a position different from the first heater 61. The gas released from the gas release valve 114 of the unit cell 111 is exhausted from the smoke exhaust port 221 through the gas guide portion 31A. Note that a smoke exhaust duct (not shown) extending outside the vehicle is connected to the smoke exhaust port 221.

The second battery group 12 is held by the second holding member 32. The second holding member 32 is disposed at a position separated from the first holding member 31. Therefore, an air layer is formed between the first holding member 31 and the second holding member 32, and heat exchange between these holding

members

31 and 32 is suppressed. The second holding member 32 includes a plurality of openings for holding each unit cell 111, and holds the outer surface of each unit cell 111 in the radial direction. The second heater 62 is located on the lower surface of the second holding member 32 (see FIG. 2). When the second heater 62 starts the heating operation, the temperature of the second holding member 32 rises. Similar to the first holding member 31, the second holding member 32 is a solid plate-like member. Therefore, the temperature of the second battery group 12 whose temperature has decreased is increased as a whole, and the battery output can be increased.

The case 20 includes a case main body 21 and a lid body 22. The case main body 21 is formed in a bottomed cylindrical shape, and includes a leg portion 211 at the lower end. A fastening hole portion 211 </ b> A for fixing the power supply device 1 is formed in the leg portion 211. The power supply device 1 may be fixed to the floor panel of the vehicle. A pair of assembling guide portions 212 for assembling the first holding member 31 and the second holding member 32 is formed on the inner surface of the case 20. The built-in guide part 212 extends in the vertical direction. The assembled battery 10 can be housed inside the case body 21 by sliding the first holding member 31 and the second holding member 32 along the pair of built-in guide portions 212.

A refrigerant inlet 21A extending in the longitudinal direction (X-axis direction) of the unit cell 111 is formed on one end surface of the case body 21 in the Y-axis direction. A refrigerant discharge port 21B extending in the direction is formed. A plurality of refrigerant inlets 21A and refrigerant outlets 21B are formed at predetermined intervals in the height direction (Z-axis direction) of the power supply device 1. An air intake duct (not shown) is connected to the refrigerant inlet 21A, and air as a refrigerant is introduced into the case 20 through the intake duct and the refrigerant inlet 21A when the blower operates.

Next, the configuration of the heating unit that controls the driving of the first heater 61 and the second heater 62 will be described with reference to FIG. The heating unit 70 includes a controller 71, a first heater 61, a second heater 62, and a memory 72. The controller 71 performs control to selectively drive one of the first heater 61 and the second heater 62. The controller 71 may be a CPU or MPU. The controller 71 may be an ASIC circuit that executes at least a part of control processing executed in the CPU and MPU in a circuit form. The memory 72 may be a readable / rewritable RAM. When the controller 71 controls the driving of either the first heater 61 or the second heater 62, the controller 71 stores identification information for identifying the driven heater in the memory 72.

The first temperature sensor (temperature information acquisition unit) 82 acquires the temperature information of the first battery group 11. The second temperature sensor (temperature information acquisition unit) 83 acquires the temperature information of the second battery group 12. The first temperature sensor 82 and the second temperature sensor 83 may be a thermistor. The first temperature sensor 82 may have a configuration included in some of the unit cells 111 in the first battery group 11 or a configuration included in each unit cell 111. The second temperature sensor 83 may have a configuration included in some of the unit cells 111 in the second battery group 12 or a configuration included in each unit cell 111.

The controller 71 detects the position of the IG switch 81 that is driven between the off position and the on position, and outputs from the first temperature sensor 82 and the second temperature sensor 83 when the IG switch 81 is in the on position. Get temperature information.

Next, a method for controlling the first heater 61 and the second heater 62 will be described with reference to the flowchart of FIG. In the initial state, it is assumed that the memory 72 stores identification information of the first heater 61 as information for specifying the battery group heated last time. In step S101, the controller 71 determines whether or not the IG switch 81 has moved from the off position to the on position. If the IG switch 81 has moved to the on position, the process proceeds to step S102.

In step S102, the controller 71 acquires temperature information output from the first temperature sensor 82 and the second temperature sensor 83. In step S103, the controller 71 calculates the average temperature based on the temperature information output from the first temperature sensor 82 and the second temperature sensor 83, and the average temperature is a first threshold value (threshold value). It is determined whether or not: Here, when the unit cell 111 becomes extremely low temperature (for example, −10 ° C.), a necessary battery output cannot be obtained. Therefore, the first threshold value can be determined as a set value from the viewpoint of securing a necessary battery output. In the present embodiment, the average temperature is compared with the first threshold value. However, the temperature information acquired by either one of the first temperature sensor 82 and the second temperature sensor 83 and the first threshold value are used. You may compare. If the average temperature is equal to or lower than the first threshold value in step S103, the process proceeds to step S104. If the average temperature is higher than the first threshold value, this flow ends.

In step S104, the controller 71 acquires heater identification information stored in the memory 72, and identifies the previous heating target. As described above, in the present embodiment, the identification information of the first heater 61 is stored in the memory 72.

In step S105, the controller 71 drives the second heater 62 different from the previous one, and proceeds to step S106. In step S106, the controller 71 determines whether or not the second battery group 12 has been heated to a temperature equal to or higher than the target temperature based on the temperature information output from the second temperature sensor 83. Here, the target temperature may be a temperature that can secure a required battery output in any one of the first battery group 11 and the second battery group 12. In the present embodiment, the target temperature is set to 40 ° C., but the present invention is not limited to this.

In step S106, when the temperature of the second battery group 12 is raised to a temperature equal to or higher than the target temperature, the process proceeds to step S107, and when the temperature is lower than the target temperature, the driving of the second heater 62 is continued.

Thus, in this embodiment, when the temperature of the unit cell 111 is extremely low, only one of the first battery group 11 and the second battery group 12 is heated and the other is prohibited. . Thereby, compared with the case where all the 1st battery groups 11 and the 2nd battery groups 12 are heated, the energy consumption of a heater can be reduced. Moreover, a required battery output can be ensured by heating up one battery group. This point will be described in detail with a specific example.

The number of single cells 111 included in the first battery group 11 is 10 cells, and the number of single cells 111 included in the second battery group 12 is 10 cells. Further, the output of the single cell 111 at −10 ° C. is 0.1 kw, the output of the single cell 111 at 20 ° C. is 5 kw, and the output of the single cell 111 at 30 ° C. is 10 kw. The amount of heat (heat capacity) required to raise the temperature of each unit cell 111 by 1 ° C. is 50 J / k. In order to raise the temperature of the entire first battery group 11 and second battery group 12 from −10 ° C. to 20 ° C., thermal energy of 50 J / k × 20 cells × 30 ° C. = 3000 J is required. In order to raise the temperature of only the first battery group 11 from −10 ° C. to 30 ° C., energy of 50 J / k × 10 cells × 40 ° C. = 2000 J is required. Therefore, when only the first battery group 11 is heated, the energy required for temperature increase is reduced to 2/3 as compared with the case where both the first battery group 11 and the second battery group 12 are heated. can do.

On the other hand, the total battery output of the first battery group 11 and the second battery group 12 heated from −10 ° C. to 20 ° C. was 20 cells × 5 kW = 100 kW, and was raised from −10 ° C. to 30 ° C. The battery output of the first battery group 11 is 10 cells × 10 kW = 100 kW. Therefore, it is possible to obtain an equivalent output while suppressing the heat energy required for temperature increase to 2/3. In addition, these numerical values are illustrations, and this invention is not limited to this.

Return to the explanation of the flowchart. In step S107, the controller 71 stops the second heater 62. In step S <b> 108, the controller 71 rewrites the identification information of the first heater 61 stored in the memory 72 with the identification information of the second heater 62. Therefore, the first heater 61 is driven the next time the temperature rise control is performed. Thus, in the present embodiment, the first heater 61 and the second heater 62 are driven alternately. That is, since the heated battery group is deteriorated by outputting larger electric power, the first battery group 11 and the second battery group 12 can be changed by alternately changing the battery group to be heated. Variation in the degree of deterioration can be suppressed.

Here, in the case of parallel connection, the unit cell 111 having a high degree of deterioration is charged by a circulating current flowing from another unit cell 111 having a low degree of deterioration, and the value of this circulating current is allowable in the unit cell 111 having a high degree of deterioration. The upper limit may be exceeded. In this embodiment, since the variation of the deterioration degree of the 1st battery group 11 and the 2nd battery group 12 is suppressed by changing the battery group used as heating object by turns, the cell 111 is made from a circulating current. Can be protected.

(Modification 1)
In the above-described embodiment, the heater for raising the temperature is disposed in each of the first holding member 31 and the second holding member 32. However, the present invention is not limited to this, and other configurations may be used. Good. In this other configuration, the heat transfer route of heat generated from one heater is transferred to the first heat transfer route to the first holding member 31 and the second heat transfer route to the second holding member 32. It may be divided into heat transfer routes, and these heat transfer routes may be switched alternately. FIG. 5 is a diagram corresponding to FIG. 2, and is a cross-sectional view of the assembled battery according to the present modification. The same components as those in the above embodiment are given the same reference numerals.

The heater 63 is in contact with the first heat transfer plate 64 and the second heat transfer plate 66. The first heat transfer plate 64 extends toward the first holding member 31, and a first piezoelectric element 65 is provided at the tip of the first heat transfer plate 64. When the first piezoelectric element 65 extends in the Y-axis direction, the first holding member 31 and the first heat transfer plate 64 are connected via the piezoelectric element 65. Accordingly, the first holding member 31 can be heated using the heat of the heater 63. When the first piezoelectric element 65 contracts in the Y-axis direction, an air layer is formed between the first holding member 31 and the first piezoelectric element 65, and heat transfer from the heater 63 to the first holding member 31 is performed. It is suppressed. The second heat transfer plate 66 extends toward the second holding member 32, and a second piezoelectric element 67 is provided at the tip of the second heat transfer plate 66. When the second piezoelectric element 67 extends in the Y-axis direction, the second holding member 32 and the second heat transfer plate 66 are connected via the second piezoelectric element 67. Thereby, the second holding member 32 can be heated using the heat of the heater 63. When the second piezoelectric element 67 contracts in the Y-axis direction, an air layer is formed between the second holding member 32 and the second piezoelectric element 67, and heat transfer from the heater 63 to the second holding member 32 is performed. It is suppressed.

In the configuration of this modified example, the first piezoelectric element 65 and the second piezoelectric element 67 are alternately driven to achieve the same effect as the above embodiment, that is, while suppressing power consumption at the time of temperature rise. Battery output can be obtained. Further, variation in the degree of deterioration between the single cells 111 in the first battery group 11 and the second battery group 12 can be suppressed. Note that the controller 71 may control the first piezoelectric element 65 and the second piezoelectric element 67. The heating unit 70 includes a circuit for driving the piezoelectric element. Since the drive circuit of the piezoelectric element is a well-known technique, description thereof is omitted.

As another modification, the heater 63 is configured to be movable, and alternately moves between a first position that contacts the first holding member 31 and a second position that contacts the second holding member 32. The structure to be made may be sufficient. In this case, the heating unit 70 includes a heater 63, a motor that moves the heater 63, a transmission mechanism that transmits the driving force of the motor to the heater 63, a guide portion that guides the heater 63 to the first position and the second position, and The structure provided with the memory 72 may be sufficient.

(Modification 2)
In the above-described embodiment, the battery temperature is used as a trigger for driving the heater. However, the present invention is not limited to this, and other methods may be used. The other method may be a method in which a temperature sensor for measuring the outside air temperature is provided in the vehicle, and the heater is driven based on a detection result by the temperature sensor. The other configuration may be a method in which a temperature sensor for measuring the temperature of the engine oil is provided in the vehicle and the heater is driven based on a detection result by the temperature sensor. Further, the other method may be a method of raising a flag when the battery temperature is low and notifying the passenger. In this case, the configuration may be such that the occupant instructs the controller 71 to drive the first heater 61 or the second heater 62 by operating a switch provided in the vehicle interior.

(Modification 3)
In the above-described embodiment, the first heater 61 and the second heater 62 are driven alternately. However, the present invention is not limited to this, and other configurations may be used. The other configuration may be a method in which one heater is continuously driven a plurality of times and then the other heater is continuously driven a plurality of times. The other configuration may be a periodic switching method in which one heater is driven for a predetermined period and then the other heater is driven for a predetermined period.

Even with these configurations, variation in the heating frequency of the first battery group 11 and the second battery group 12 in a certain period is suppressed, so that the first battery group 11 and the second battery group 12 can be Variation in the deterioration degree of the battery 111 can be suppressed. That is, the reference for the heating unit 70 to select the heating target can be set from the viewpoint of suppressing the variation in the heating frequency, and is not necessarily limited to one method.

(Modification 4)
In the above embodiment, the assembled battery is divided into two battery groups. However, the present invention is not limited to this, and may be divided into three or more battery groups. FIG. 6 is a cross-sectional view of an assembled battery according to this modification, and the same reference numerals are given to elements having the same functions as those in the above embodiment. The assembled battery 10 includes a first battery group 11, a second battery group 12, and a third battery group 13. The first battery group 11 includes a plurality of single cells 111 and is held by a first holding member 31. The second battery group 12 includes a plurality of single cells 111 and is held by the second holding member 32. The third battery group 13 includes a plurality of single cells 111 and is held by a third holding member 33. These holding members 31 to 33 are spaced apart from each other. Therefore, the first battery group 11, the second battery group 12, and the third battery group 13 are prevented from exchanging heat with each other, and heat exchange between the single cells 111 included in the holding members 31 to 33 is allowed. .

A first heater 61 is disposed on the first holding member 31, a second heater 62 is disposed on the second holding member 32, and a third heater is disposed on the third holding member 33. 68 is arranged. When the temperature of the battery is raised by driving some of the heaters 61 to 68, the power consumption at the time of raising the battery can be reduced as compared with the case where all the heaters 61 to 68 are driven.

In this case, if a necessary battery output can be secured by one battery group, one heater may be driven. If the required battery output can be secured by the two battery groups, the two heaters may be driven. These heaters 61 to 68 may be controlled by the controller 71. In addition, the selection criterion of the drive object by the controller 71 can be appropriately set from the viewpoint of suppressing variation in the heating frequency, and is not necessarily limited to one method. In addition, the configuration according to this modification may be combined with other modifications in this specification.

(Modification 5)
In the above-described embodiment, the first battery group 11 and the second battery group 12 are arranged apart from each other in the vertical direction, but may be separated obliquely or horizontally.

(Modification 6)
In the above-described embodiment, the single cells 111 are connected in parallel. However, the present invention is not limited to this, and may be connected in series.

(Modification 7)
In the above-described embodiment, the heater is disposed on the holding member. However, the present invention is not limited to this and may be disposed on another element. The other element may be the outer surface of the unit cell 111. For example, when the first heater 61 is installed on the outer surface of the unit cell 111 held by the first holding member 31, the other is held by the first holding member 31 via the first holding member 31. Since the heat of the first heater 61 is transferred to the unit cell 111, the temperature of the first battery group 11 can be increased as a whole.

DESCRIPTION OF SYMBOLS 1 Power supply device 10 Assembly battery 11 1st battery group 12 2nd battery group 20 Case 20A Gas discharge path 20B Cooling path 21 Case main body 21A Refrigerant inlet 21B Refrigerant outlet 22 Lid 31 First holding member 32 Second Holding member 40 bus bar 61 first heater 62 second heater 70 heating unit 71 controller 72 memory 81 IG switch 82 first temperature sensor 83 second temperature sensor 111 single cell 112 positive electrode terminal 114 gas release valve

Claims

A plurality of battery groups each comprising a plurality of single cells;
A plurality of holding members for holding each of the battery groups, wherein the plurality of holding members are arranged apart from each other, allowing heat exchange between the cells in each of the battery groups;
A vehicle power supply device comprising: a heating unit for selectively heating a part of the plurality of battery groups.
The plurality of battery groups includes a first battery group and a second battery group,
The plurality of holding members include a first holding member that holds the first battery group and a second holding member that holds the second battery group,
2. The power supply device for a vehicle according to claim 1, wherein the heating unit selectively heats one of the first battery group and the second battery group.
The vehicle power supply device according to claim 2, wherein the heating unit switches a heating target alternately between the first battery group and the second battery group.
The vehicle power supply device according to claim 3, wherein all of the single cells included in the power supply device are connected in parallel.
The said single cell is cylindrical shape, All the said single cells contained in this power supply device are arranged in the surface containing the radial direction of this single cell, The one of the Claims 1 thru | or 4 characterized by the above-mentioned. The power supply device for vehicles as described in one.
A temperature information acquisition unit for acquiring information on the temperature of the power supply device;
6. The heating unit according to claim 1, wherein the heating unit selectively heats the partial battery group only when the temperature acquired by the temperature information acquisition unit is equal to or lower than a threshold value. Power supply device for vehicles as described in one.
The said heating unit is provided with the some heater each arrange | positioned at each said holding member, and the controller which controls the drive of these heaters, The Claim 1 characterized by the above-mentioned. Power supply device for vehicles.
A vehicle equipped with the power supply device for a vehicle according to any one of claims 1 to 7.