Vehicle

Abstract

To allow reception of regenerative power although a power storage device (battery) loaded on a vehicle is in a fully charged state, so that recovery efficiency of regenerative energy improves.SOLUTION: A vehicle V is provided with a battery 10 and an RFC 70, and uses power of the battery 10 and the RFC 70 to drive an MG 30 for traveling. Regenerative power generated by the MG 30 is received by the battery 10 and a water electrolysis device 72. A power distribution mechanism 60 supplies regenerative power to the battery 10 so that lithium deposition does not occur during charge of the battery 10, and supplies the remaining regenerative power to the water electrolysis device 72.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a vehicle.

Background Art

[0002] International Publication No. 2017 / 130080 (Patent Document 1) discloses a technique for controlling a motor to generate electricity during braking in an automobile or the like equipped with a battery, and supplying the generated electric power (regenerative electric power) to the battery with the smaller remaining capacity among a first battery and a second battery.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technique described in Patent Document 1, it is said that by switching and using the battery to which the regenerative electric power is supplied according to the state of charge of each battery, it is possible to suppress the depletion of the charge amount of one or more of the plurality of batteries.

[0005] However, when a plurality of batteries ("first battery and second battery") are fully charged, it is not possible to charge the battery with the regenerative electric power. Even when the battery is in a fully charged state, it is desired to recover the regenerative electric power and improve the recovery efficiency of the regenerative energy.

[0006] An object of the present disclosure is to enable a power storage device (battery) mounted on a vehicle to receive regenerative electric power even when it is in a fully charged state, and to improve the recovery efficiency of the regenerative energy.

Means for Solving the Problems

[0007] The vehicle of the present disclosure includes a power storage device, a regenerative fuel cell including a water electrolysis device and a fuel cell, a motor generator driven by at least one of the power storage device and the fuel cell, drive wheels driven by the motor generator, and a control device that executes regenerative control to generate regenerative power by the motor generator when the vehicle brakes. When the SOC (State Of Charge) of the power storage device is equal to or greater than a predetermined value during the execution of the regenerative control, the control device supplies the regenerative power to the water electrolysis device.

[0008] According to this configuration, the control device of the vehicle generates power by the motor generator when the vehicle brakes by executing regenerative control, and recovers the regenerative power (regenerative energy). When the SOC of the power storage device is equal to or greater than a predetermined value, for example, when it is approaching the fully charged state and cannot accept the regenerative power, the control device supplies the regenerative power to the water electrolysis device. Since the water electrolysis device can electrolyze water to generate oxygen and hydrogen by the supplied regenerative power, the regenerative power can be recovered as fuel for the fuel cell, and the recovery efficiency of the regenerative energy can be improved.

[0009] Preferably, the control device may be configured not to supply the regenerative power to the water electrolysis device when the hydrogen filling amount of the hydrogen tank of the regenerative fuel cell is full, or when the oxygen filling amount of the oxygen tank of the regenerative fuel cell is full.

[0010] According to this configuration, when the hydrogen filling amount of the hydrogen tank is full, or when the oxygen filling amount of the oxygen tank is full, the supply of the regenerative power to the water electrolysis device is not performed. Therefore, when each tank is in a full state and it is difficult to fill the tank even if hydrogen or oxygen is generated, hydrogen and oxygen are not generated by the water electrolysis device, so the regenerative fuel cell can be protected. Note that the full state means a filling state in which there is no space in each tank and it is substantially difficult to fill hydrogen or oxygen even if hydrogen or oxygen is generated by the water electrolysis device.

[0011] Preferably, the power storage device is composed of a lithium-ion battery. When the SOC of the power storage device is less than a predetermined value, the control device supplies the regenerative power to charge the power storage device within a charging current range in which lithium does not precipitate on the lithium-ion battery due to charging by the regenerative power, and supplies the remaining regenerative power supplied to the power storage device to the water electrolysis device.

[0012] During charging, lithium ions may precipitate as metallic lithium on the surface of the negative electrode (lithium precipitation) in a lithium-ion battery. In particular, lithium precipitation occurs when high-rate charging (large current charging) is performed at low temperatures of the lithium-ion battery.

[0013] According to this configuration, even when the SOC of the power storage device is less than a predetermined value and the power storage device can receive regenerative power, the power storage device is charged using the regenerative power within a charging current range in which lithium does not precipitate on the lithium-ion battery due to charging by the regenerative power. Then, the remaining regenerative power supplied to the power storage device (used to charge the power storage device) is supplied to the water electrolysis device. Thereby, while suppressing lithium precipitation in the power storage device (lithium-ion battery), the power storage device and the water electrolysis device can receive regenerative power, and the recovery efficiency of regenerative energy can be improved.

[0014] Preferably, a temperature raising device for raising the temperature of the lithium-ion battery using the exhaust heat of the regenerative fuel cell is provided, and the control device may operate the temperature raising device when the temperature of the lithium-ion battery is equal to or lower than a set temperature.

[0015] The lower the temperature of the lithium-ion battery, the more likely lithium precipitation occurs with a small charging current. According to this configuration, when the temperature of the lithium-ion battery is equal to or lower than the set temperature, the temperature raising device for raising the temperature of the lithium-ion battery using the exhaust heat of the regenerative fuel cell is operated. Thereby, the temperature of the lithium-ion battery is raised, the charging current at which lithium precipitation occurs can be increased, and the charging power of the lithium-ion battery can be increased, so that the recovery efficiency of regenerative energy can be improved.

[0016] Preferably, the temperature raising device may be a temperature adjusting water path including a water passage and a heat exchanger. According to this configuration, since the exhaust heat of the fuel cell can be utilized by the temperature adjusting water path, the lithium ion battery can be heated with a relatively simple configuration.

Advantages of the Invention

[0017] According to the present disclosure, even when the power storage device mounted on the vehicle is fully charged, it becomes possible to receive regenerative power, and the recovery efficiency of regenerative energy can be improved.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0019] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments shown below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

[0020] FIG. 1 is a diagram for explaining the schematic configuration of a vehicle V according to the present embodiment. In the present embodiment, the vehicle V is, for example, a lunar rover (lunar vehicle) that travels on the lunar surface. The vehicle V includes a battery (power storage device) 10, a PCU (Power Control Unit) 20, a motor generator (MG) 30, and drive wheels 40.

[0021] The battery 10 is a battery pack in which stacks of a plurality of single cells are connected in series. The single cell is a rechargeable lithium-ion battery. A monitoring unit 11 including a current sensor, a voltage sensor, a temperature sensor, etc. is arranged in the battery 10. The monitoring unit 11 is constituted by, for example, an electronic control unit (ECU: Electronic Control Unit). Information on the input / output current (battery current) IB of the battery 10, the temperature of the battery 10 (battery temperature) TB, and the voltage of the battery 10 (battery voltage) VB is acquired by the monitoring unit 11. Further, the monitoring unit 11 calculates the SOC of the battery 10 from the current method and / or the SOC-OCV (Open Circuit Voltage) characteristics. Note that the SOC of the battery 10 may be calculated in the control ECU 200 described later.

[0022] The PCU 20 is a drive device that drives the motor generator 30 using the electric power stored in the battery 10 and the electric power generated by the fuel cell 71 described later. The battery 10 and the PCU 20 can be electrically connected and disconnected via the relay R1. In the present embodiment, the PCU 20 is constituted by, for example, a DC / DC converter and an inverter (not shown). The DC / DC converter boosts the DC voltage of the battery 10 and supplies it to the inverter. The inverter is a three-phase inverter, converts the DC power supplied from the battery 10 into AC power, and drives the motor generator 30. The inverter converts the AC power regenerated by the motor generator 30 into DC power and supplies it to the battery 10 via the DC / DC converter. Note that the DC / DC converter may be omitted.

[0023] MG30 generates power to drive the vehicle V by receiving AC power from the PCU20. MG30 is an AC rotating electrical machine, for example, a permanent magnet synchronous motor equipped with a rotor in which permanent magnets are embedded. The power of MG30 is transmitted to the drive wheels 40. On the other hand, when the vehicle V decelerates or stops, MG30 converts the kinetic energy of the vehicle V into electrical energy and generates electric power (generates regenerative power). The AC regenerative power generated by MG30 is converted into DC power by the PCU20 (inverter) and supplied to the battery 10 and the water electrolyzer 72 described later. In this way, MG30 is configured to generate the driving force or braking force of the vehicle V with the transfer of electric power.

[0024] In addition, the vehicle V is provided with a service brake (mechanical brake) 50, and when the vehicle V is braked, it is also possible to apply the braking force by the service brake 50 in addition to the regenerative braking force by MG30.

[0025] The vehicle V is equipped with a regenerative fuel cell (RFC). RFC70 includes a fuel cell 71, a water electrolyzer 72, a water tank 73, a hydrogen tank 74, and an oxygen tank 75. The fuel cell 71 is, for example, a polymer electrolyte fuel cell, and generates electric power using hydrogen filled in the hydrogen tank 74 and oxygen filled in the oxygen tank 75. The DC power generated by the fuel cell 71 is supplied to the PCU20 via the relay R2. Note that the water generated during the power generation of the fuel cell 71 is stored in the water tank 73.

[0026] The water electrolyzer 72 generates hydrogen and oxygen by electrolyzing the water stored in the water tank 73. The hydrogen generated by the water electrolyzer 72 is filled in the hydrogen tank 74, and the oxygen generated by the water electrolyzer 72 is filled in the oxygen tank 75.

[0027] The water electrolysis device 72 and the PCU 20 can be electrically connected and disconnected via the relay R3, and the regenerative power generated by the MG 30 can be supplied. The water electrolysis device 72 is connected to the solar power generation device 90 via the relay R4. When the relay R3 and the relay R4 are closed (connected), the power generated by the solar power generation device 90 is supplied to the water electrolysis device 72. The solar power generation device 90 is connected to the battery 10 via the relay R5 provided downstream of the relay R4. When the relay R1, the relay R4, and the relay R5 are closed (connected), the power generated by the solar power generation device 90 can be charged to the battery 10.

[0028] The power distribution mechanism 60 is disposed between the PCU 20 and the battery 10 (relay R1) and the water electrolysis device 72 (relay R3). The power distribution mechanism 60 is a device that distributes the regenerative power generated by the MG 30 to the battery 10 and the water electrolysis device 72, and controls the magnitude (distribution amount) of the regenerative power supplied to the battery 10 and the water electrolysis device 72. The power distribution mechanism 60 may be composed of, for example, a plurality of switching elements, and controls the duty ratio of each switching element to control the magnitude of the regenerative power supplied to the battery 10 and the water electrolysis device 72. The power distribution mechanism 60 may include a variable resistor and controls the resistance value to control the magnitude of the regenerative power supplied to the battery 10 and the water electrolysis device 72. The power distribution mechanism 60 includes a bypass circuit, and the power supplied from the battery 10 to the PCU 20 is not controlled by the power distribution mechanism 60.

[0029] The vehicle V is provided with a temperature control water path 100. The temperature control water path 100 is a temperature raising device that recovers the exhaust heat of the RFC70 and uses the exhaust heat of the RFC70 to raise the temperature of the battery 10. The temperature control water path 100 includes a water passage 110, a pump 120, an RFC heat exchanger 130, a battery heat exchanger 140, and a radiator 150. When the pump 120 is driven, the cooling water (coolant) in the water passage 110 is pumped in the order of the RFC heat exchanger 130, the battery heat exchanger 140, and the radiator 150. The cooling water flowing through the water passage 110 exchanges heat with the RFC70 in the RFC heat exchanger 130 and receives the exhaust heat of the RFC70. In the battery heat exchanger 140, the cooling water exchanges heat with the battery 10, dissipates heat, and raises the temperature of the battery 10.

[0030] When the temperature of the cooling water is low, the thermostat 151 is closed, and the cooling water flows in the bypass passage 111 and returns to the pump 120. When the temperature of the cooling water is high, the thermostat 151 opens, and the cooling water is cooled (heat dissipated) by the radiator 150 and then returns to the pump 120.

[0031] The vehicle V further includes a control ECU 200. The control ECU 200 corresponds to the "control device" of the present disclosure. The control ECU 200 controls the relays R1 to R5, the PCU 20, the power distribution mechanism 60, the RCF70, the pump 120, etc. The control ECU 200 includes a CPU (Central Processing Unit) 201, a memory 202, and an input / output port (not shown). The memory 202 includes a ROM (Read Only Memory) and a RAM (Random Access Memory) and stores programs and the like executed by the CPU 201. The CPU 201 executes predetermined arithmetic processing based on various signals input from the input / output port, information obtained from the monitoring unit 11, and information stored in the memory, and controls the relays R1 to R5, the PCU 20, the power distribution mechanism 60, the RCF70, the pump 120, etc. based on the arithmetic result.

[0032] When the state of charge (SOC) of the battery 10 is high and the battery 10 is close to a fully charged state, charging the battery 10 will result in overcharging. Therefore, when the SOC of the battery 10 is high, the regenerative power generated by the MG30 cannot be used to charge the battery 10, and the recovery efficiency of the regenerative energy decreases. In addition, the battery 10 is a lithium-ion battery. In particular, when charging the regenerative power at a high rate (large current) at low temperatures of the battery 10, lithium precipitation may occur.

[0033] In this embodiment, by supplying the regenerative power generated by the MG30 to the water electrolysis device 72 in addition to the battery 10, the recovery efficiency of the regenerative power (regenerative energy) is improved.

[0034] FIG. 2 is a flowchart showing an outline of the regenerative control executed by the control ECU 200. This flowchart is executed when the generation of regenerative power is started by the MG30. Further, it may be executed when it is predicted that a downhill road will be traveled on a preset travel route. Note that when a braking operation of the vehicle V is performed, the control ECU 200 controls the MG30 to operate as a generator to generate regenerative power.

[0035] In step (hereinafter, step is abbreviated as "S") 10, it is determined whether the SOC of the battery 10 is equal to or greater than a predetermined value A. The predetermined value A may be a value at which the battery 10 can be regarded as being in a fully charged state, for example, 85%. If the SOC is equal to or greater than the predetermined value A, an affirmative determination is made and the process proceeds to S13. If the SOC is less than the predetermined value A, a negative determination is made and the process proceeds to S11.

[0036] In S11, it is determined whether the battery temperature TB is equal to or less than a predetermined value B. The predetermined value B is a temperature at which lithium precipitation occurs when the battery temperature TB drops below this temperature when the battery 10 is charged, and is set in advance through experiments or the like. When the battery temperature TB is greater than the predetermined value B, a negative determination is made and the process proceeds to S12. When the battery temperature TB is equal to or less than the predetermined value B, an affirmative determination is made and the process proceeds to S13.

[0037] In S12, since the battery 10 is not in a fully charged state and lithium precipitation does not occur even when the regenerative power is charged, the regenerative power is recovered by the battery 10 by charging the regenerative power to the battery 10. At this time, the relay R1 is closed, and the power distribution mechanism 60 is controlled so that all of the regenerative power generated by the MG30 is supplied to the battery 10.

[0038] In S13, it is determined whether or not the hydrogen tank 74 is filled with hydrogen. For example, when the internal pressure of the hydrogen tank 74 is equal to or higher than a predetermined value, it is determined that it is full. If an affirmative determination is made in S13, the process proceeds to S15, and if a negative determination is made, the process proceeds to S14.

[0039] In S14, it is determined whether or not the oxygen tank 75 is filled with oxygen. For example, when the internal pressure of the oxygen tank 75 is equal to or higher than a predetermined value, it is determined that it is full. If an affirmative determination is made in S14, the process proceeds to S15, and if a negative determination is made, the process proceeds to S16.

[0040] In S15, the vehicle V is braked by the service brake 50, and the kinetic energy of the vehicle V is consumed as the heat energy of the brake. Since the battery temperature TB is equal to or lower than the predetermined value B, lithium precipitation may occur when charging is performed using the regenerative power, and the hydrogen tank 74 and the oxygen tank 75 are full, making it difficult to electrolyze water by the water electrolysis device 72, braking (deceleration of the vehicle V) mainly using the service brake 50 is performed.

[0041] In S16, the RFC70 is activated. For example, the valves of the water tank 73, the hydrogen tank 74, and the oxygen tank 75 are opened, and the operation of the RFC70 is performed. Further, if necessary, the operation of the fuel cell 71 may be started.

[0042] In the subsequent S17, it is determined whether the battery temperature TB is less than or equal to the set temperature C. The set temperature C is a temperature for determining that the temperature of the battery 10 is extremely low, and is a value lower than the temperature corresponding to the predetermined value B. For example, the set temperature C may be -30 to -20°C. If the battery temperature TB is less than or equal to the set temperature C, an affirmative determination is made and the process proceeds to S18. If the battery temperature TB is higher than the set temperature C, a negative determination is made and the process proceeds to S19.

[0043] In S18, by driving the pump 120, the temperature adjustment water path 100 is activated to increase the temperature of the battery 10. After S18, the process proceeds to S19.

[0044] In S19, using the battery 10 and the water electrolysis device 72, the regenerative power generated by the MG30 is recovered. The relay R1 and the relay R3 are closed, and the power distribution mechanism 60 is controlled to supply the regenerative power to the battery 10 and the water electrolysis device 72. At this time, the control ECU200 controls the power distribution mechanism 60 so that lithium precipitation does not occur in the battery 10 due to the regenerative power (charging power) supplied to the battery 10.

[0045] Figure 3 is a map showing the relationship between the charging current at which lithium precipitation occurs in the battery 10 and the charging time. This map can be obtained in advance by experiments or the like. In Figure 3, the vertical axis represents the charging current, and the horizontal axis represents the charging time. The charging current increases as it gets larger in the negative direction. When the charging current becomes larger than the precipitation limit current shown in Figure 3, lithium precipitation occurs in the battery 10. The precipitation limit current decreases as the charging time elapses. Also, the precipitation limit current decreases as the battery temperature TB decreases (the lower the temperature).

[0046] The control ECU 200 obtains the precipitation limit current from the map in FIG. 3 based on the battery temperature TB and the charging time. Then, the control ECU 200 controls the power distribution mechanism 60 so that the regenerative power supplied to the battery 10 becomes a charging current smaller than the precipitation limit current shown in FIG. 3. And the control ECU 200 controls the power distribution mechanism 60 so as to supply the remaining regenerative power (the power obtained by subtracting the power supplied to the battery 10 from the regenerative power generated by the MG30) to the water electrolysis device 72. For example, when the regenerative power generated by the MG30 is Rm and the regenerative power supplied to the battery 10 is Rb, the regenerative power of "Rm - Rb" is supplied to the water electrolysis device 72. Thereby, while the battery 10 is charged with the regenerative power, the water electrolysis device 72 electrolyzes water using the regenerative power to generate hydrogen and oxygen, so that the regenerative power can be efficiently recovered.

[0047] Note that, depending on the determination result in S17, the magnitude of the regenerative power supplied to the battery 10 may be made different. For example, when a negative determination is made in S17 (when "battery temperature TB > set temperature C"), the regenerative power supplied to the battery 10 is controlled so as to become a charging current of 95% of the precipitation limit current obtained from the map in FIG. 3. Also, when an affirmative determination is made in S17 (when "battery temperature TB ≤ set temperature C"), the regenerative power supplied to the battery 10 is controlled so as to become a charging current of 60% of the precipitation limit current obtained from the map in FIG. 3.

[0048] In this way, by controlling the regenerative power supplied to the battery 10, in the case of "battery temperature TB > set temperature C", a large amount of regenerative power can be charged into the battery 10 with high responsiveness during power output (discharge). Also, in the case of "battery temperature TB ≤ set temperature C", since the regenerative power supplied to the water electrolysis device 72 increases, the waste heat (heat generation) of the RFC70 (water electrolysis device 72) increases, and the temperature rise of the battery 10 can be promoted.

[0049] In the subsequent S20, it is determined whether or not the power generation (regeneration) by the MG20 has ended. If the regeneration has not ended, a negative determination is made and the process returns to S10. If the regeneration has ended, the current routine ends.

[0050] According to the present embodiment, when the SOC of the battery 10 is equal to or higher than a predetermined value A, approaching a fully charged state and unable to accept regenerative power, the control ECU 200 supplies the regenerative power to the water electrolysis device 72. Since the water electrolysis device 72 can electrolyze water to generate oxygen and hydrogen by the supplied regenerative power, the regenerative power can be recovered as fuel for the fuel cell 71, and the recovery efficiency of the regenerative energy can be improved.

[0051] According to the present embodiment, when the hydrogen filling amount of the hydrogen tank 74 of the RFC70 is full, or when the oxygen filling amount of the oxygen tank 75 is full, the supply of regenerative power to the water electrolysis device 72 is not performed. In the present embodiment, "full filling" means a filling state in which, even if hydrogen or oxygen is generated by the water electrolysis device 72, there is no space in each tank and it is substantially difficult to fill hydrogen or oxygen. Therefore, when it is difficult to fill each tank even if hydrogen or oxygen is generated, hydrogen and oxygen are not generated by the water electrolysis device 72, so the RCF70 can be protected.

[0052] According to the present embodiment, when the SOC of the battery 10 is less than the predetermined value A, when the battery temperature TB is higher than the predetermined value B (negative determination in S11), since lithium precipitation does not occur even if the regenerative power is charged, the regenerative power is charged to the battery 10 (S12). Also, in a state where lithium precipitation may occur due to the charging of the battery 10, within the range of the charging current in which lithium does not precipitate in the battery 10 by charging with the regenerative power, using the precipitation limit current obtained from the map of FIG. 3, the battery 10 is charged using the regenerative power, and the remaining regenerative power supplied to the battery 10 is supplied to the water electrolysis device 72. Thereby, while suppressing the lithium precipitation in the battery 10, both the battery 10 and the water electrolysis device 72 can accept the regenerative power, and the recovery efficiency of the regenerative energy can be improved.

[0053] According to this embodiment, when the battery temperature TB is equal to or lower than the set temperature C, the temperature adjustment water path 100 (temperature adjustment device) is activated, and the waste heat of RFC70 is utilized to increase the temperature of the battery 10. By increasing the temperature of the battery 10, the precipitation limit current can be increased, and the charging power of the battery 10 can be increased, so that the recovery efficiency of the regenerative energy can be improved.

[0054] In the above embodiment, the vehicle V is assumed to be a lunar rover, but the vehicle may be a ground vehicle or an industrial vehicle such as a forklift.

[0055] In the above embodiment, in S15, braking mainly using the service brake 50 (deceleration of the vehicle V) was performed. However, when it is difficult to accept the regenerative power by the battery 10 and the water electrolysis device 72, an electric heater capable of consuming the regenerative power may be provided, and the temperature of the battery 10 may be increased or the interior of the vehicle may be heated using this electric heater.

[0056] In the flowchart of FIG. 2, the order of processing each step may be appropriately changed, and some steps may be omitted. For example, S16 may be omitted, and S17 and S18 may be omitted.

[0057] The embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present disclosure is indicated by the claims, and all changes within the meaning and scope equivalent to the claims are included.

Explanation of Reference Numerals

[0058] 10 Battery (energy storage device), 11 Monitoring unit, 20 PCU, 30 Motor generator (MG), 40 Driving wheels, 50 Service brake, 60 Power distribution mechanism, 70 Regenerative fuel cell (RFC), 71 Fuel cell, 72 Water electrolyzer, 73 Water tank, 74 Hydrogen tank, 75 Oxygen tank, 90 Solar power generation device, 100 Temperature control water path, 110 Water passage, 111 Bypass passage, 120 Pump, 130 RFC heat exchanger, 140 Battery heat exchanger, 150 Radiator, 151 Thermostat, 200 Control ECU, 201 CPU, 202 Memory, R1~R5 Relays, V Vehicle.

Claims

1. An energy storage device, A regenerative fuel cell including a water electrolysis device and a fuel cell, A motor generator driven by at least one of the electric power of the energy storage device and the fuel cell, Drive wheels driven by the motor generator, A control device that executes regenerative control to generate regenerative power by the motor generator during braking of the vehicle, and When the SOC of the energy storage device is equal to or higher than a predetermined value during execution of the regenerative control, the control device supplies the regenerative power to the water electrolysis device, The control device is configured not to supply the regenerative power to the water electrolysis device when the hydrogen filling amount of the hydrogen tank of the regenerative fuel cell is full or when the oxygen filling amount of the oxygen tank of the regenerative fuel cell is full. A vehicle.

2. The energy storage device is composed of a lithium-ion battery, When the SOC of the energy storage device is less than the predetermined value, the control device supplies the regenerative power within a charging current range in which lithium does not precipitate in the lithium-ion battery by charging with the regenerative power, and charges the energy storage device. The vehicle according to claim 1, wherein the remaining regenerative power supplied to the energy storage device is supplied to the water electrolysis device.

3. Further provided with a temperature raising device for raising the temperature of the energy storage device using the exhaust heat of the regenerative fuel cell, The control device operates the temperature raising device when the temperature of the energy storage device is equal to or lower than a set temperature. The vehicle according to claim 2.

4. The temperature raising device is a temperature adjustment water path including a water path and a heat exchanger. The vehicle according to claim 3.

5. An energy storage device, A regenerative fuel cell including a water electrolysis device and a fuel cell, A motor generator driven by at least one of the electric power of the energy storage device and the fuel cell, Drive wheels driven by the motor generator, A control device that executes regenerative control to generate regenerative power by the motor generator during braking of the vehicle, and When the SOC of the energy storage device is equal to or higher than a predetermined value during execution of the regenerative control, the control device supplies the regenerative power to the water electrolysis device, The energy storage device is composed of a lithium-ion battery, When the SOC of the power storage device is less than the predetermined value, the control device supplies the regenerative power within a range of charging current in which lithium does not precipitate in the lithium-ion battery due to charging by the regenerative power, charges the power storage device, and supplies the remaining regenerative power supplied to the power storage device to the water electrolysis device.

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