Title of invention: Composite power storage system
Technical field
[0001]
　The present invention relates to a composite power storage system.
Background technology
[0002]
　Conventionally, in vehicles such as hybrid vehicles and electric vehicles, a composite power storage system that increases the amount of power regeneration and optimizes output and capacity by connecting different types of batteries having different characteristics in parallel has been known. For example, in Patent Document 1, in a composite power storage system in which a lead storage battery (capacitive battery) and a lithium ion battery (power type battery) are connected in parallel, a configuration that does not use a DC / DC converter is used to reduce manufacturing costs. A method for increasing the amount of regeneration is disclosed.
Prior art literature
Patent documents
[0003]
Patent Document 1: Japanese Unexamined Patent Publication No. 2016-21302
Outline of the invention
Problems to be solved by the invention
[0004]
　However, in the composite power storage system in which the above-mentioned capacity-type battery and power-type battery are connected in parallel, since there is only one power-type battery, the power load on the capacity-type battery cannot be reduced, and the capacity-type battery is used. It was necessary to force or regenerate more power than the permissible power. As a result, the capacitive battery may generate abnormal heat and deteriorate rapidly.
[0005]
　The present invention has been made to solve such a technical problem, and an object of the present invention is to provide a composite power storage system capable of reducing the load on a capacity-type battery and preventing heat generation and deterioration of the capacity-type battery. To do.
Means to solve problems
[0006]
　The composite power storage system of the present invention that solves the above problems is a composite power storage system that supplies DC power to a plurality of power supply targets, and includes one capacity type battery and a plurality of power type power storage devices, and the plurality of power types. The power storage device is characterized in that it is provided one-to-one with respect to the plurality of power supply targets.
Effect of the invention
[0007]
　According to the present invention, the load on the capacity-type battery can be reduced, and heat generation and deterioration of the capacity-type battery can be suppressed.
A brief description of the drawing
[0008]
FIG. 1 is a schematic view showing an electric vehicle to which the composite power storage system according to the first embodiment is applied.
FIG. 2 is a circuit configuration diagram around each power type battery and a schematic diagram showing pulsating flow smoothing.
FIG. 3 is a schematic view showing an electric vehicle to which the composite power storage system according to the second embodiment is applied.
FIG. 4 is a schematic diagram showing the effect of shifting the switching phase of each inverter.
FIG. 5 is a schematic view showing an electric vehicle to which the composite power storage system according to the third embodiment is applied.
FIG. 6 is a flowchart showing a control process using the first relay.
FIG. 7 is a schematic view showing an electric vehicle to which the composite power storage system according to the fourth embodiment is applied.
FIG. 8 is a flowchart showing a control process using the second relay.
FIG. 9 is a schematic view showing an electric vehicle to which the composite power storage system according to the fifth embodiment is applied.
Mode for carrying out the invention
[0009]
　Hereinafter, embodiments of the composite power storage system according to the present invention will be described with reference to the drawings. The following description shows specific examples of the contents of the present invention, and the present invention is not limited to these explanations. It can be changed and modified. Further, in all the drawings for explaining the present invention, those having the same function are designated by the same reference numerals, and the repeated description thereof will be omitted.
[0010]
　Further, in the following description, the composite power storage system of the present invention is applied to an electric vehicle, but the present invention is also applied to a hybrid vehicle, a three-wheeled vehicle, a train, a ship, an aircraft, and the like in addition to the electric vehicle.
[0011]

　FIG. 1 is a schematic view showing an electric vehicle to which the composite power storage system according to the first embodiment is applied. As shown in FIG. 1, the electric vehicle 1 has four wheels 2, and the electric vehicle 1 is equipped with a composite power storage system 10. The composite power storage system 10 includes one capacity-type battery 14 and a plurality of (four in the present embodiment) power-type batteries 13, and supplies DC power to a plurality of power supply targets. In the present embodiment, the plurality of power supply targets are four motor generators 11 provided on a one-to-one basis with respect to the wheels 2 of the electric vehicle 1.
[0012]
　The power type battery 13 is superior in output density to the capacity type battery 14, but its energy density and capacity (Ah) are smaller than those of the capacity type battery 14. In other words, when the cost is the axis, the power type battery 13 has a higher cost per energy (kWh) than the capacity type battery 14, but the cost per output (kW) is lower than the capacity type battery 14. It has characteristics. Examples of such a power type battery 13 include a lithium ion battery and a nickel hydrogen battery.
[0013]
　The power type battery 13 corresponds to the "power type power storage device" described in the claims. The power storage device of the present invention includes, in addition to a power type battery, a lithium ion capacitor and an electric double layer capacitor having high output characteristics similar to those of the power type battery. In the present embodiment and the following embodiments, an example of a power type battery will be described as a power type power storage device, but it goes without saying that the present invention is also applied to a lithium ion capacitor, an electric double layer capacitor, and the like.
[0014]
　On the other hand, the capacity type battery 14 is inferior in output density to the power type battery 13, but has excellent energy density and a large capacity (Ah). In other words, when the cost is the axis, the capacity type battery 14 has a higher cost per output (kW) than the power type battery 13, but the cost per energy (kWh) is lower than the power type battery 13. It has characteristics. Examples of such a capacity-type battery 14 include a lithium ion battery, a lithium ion semi-solid state battery, a lithium solid state battery, a lead battery, and a nickel zinc battery.
[0015]
　As shown in FIG. 1, the four power type batteries 13 are provided on a one-to-one basis with respect to the four motor generators 11 described above, and are connected in parallel with the capacitance type batteries 14, respectively. Each power type battery 13 is connected to each motor generator 11 via an inverter 12, which is a power conversion device corresponding to each motor generator 11.
[0016]
　The motor generator 11 functions as a drive motor that applies a driving force to the wheels 2 by using the electric power supplied from the power type battery 13 and / and the capacity type battery 14 corresponding to the power running. Further, at the time of regeneration, the motor generator 11 functions as a generator for charging the corresponding power type battery 13 and / and the capacity type battery 14 by using the electric power generated by the regenerative braking. Here, the motor generator 11 is an AC machine, for example, an induction machine or a synchronous machine.
[0017]
　The inverter 12 converts the DC power supplied from the power type battery 13 and the capacity type battery 14 into three-phase AC power and outputs the DC power to the motor generator 11. The motor generator 11 rotationally drives the wheels 2 by the three-phase AC power output from the inverter 12. As a result, the electric vehicle 1 runs.
[0018]
　The inverter 12, the power type battery 13, and the capacity type battery 14 are controlled by an ECU (Electronic Control Unit) 15 mounted on the electric vehicle 1. The ECU 15 has a built-in microcomputer and controls each component constituting the composite power storage system 10 by executing a stored program.
[0019]
　In the electric vehicle 1 configured in this way, when the power supply to the motor generator 11 is insufficient only with the capacity type battery 14 such as acceleration of the electric vehicle 1, the power type battery 13 is added to the capacity type battery 14. Also, DC power is supplied to the motor generator 11 via the inverter 12. Then, during deceleration or braking of the electric vehicle 1, that is, during regeneration of the motor generator 11, the AC power generated by the motor generator 11 is converted into DC power by operating the inverter 12 as a rectifying device. It is stored in the power type battery 13 and / and the capacity type battery 14. Further, when the electric vehicle 1 is parked, the capacity type battery 14 and / and the power type battery 13 are charged by a charging device (not shown).
[0020]
　According to the composite power storage system 10 of the present embodiment, the power type battery 13 and the capacity type battery 14 are used in combination to optimize the output capacity performance such that the output of the battery is increased while securing the capacity of the battery as a whole to be used. It is possible to optimize the cost for the required performance (kWh, kWh). Since the performance of such a composite power storage system 10 can be optimized, the load can be reduced as compared with the case where only the capacitive battery 14 is used.
[0021]
　Further, in the composite power storage system 10 of the present embodiment, since the power type battery 13 is provided 1: 1 with respect to the motor generator 11, the load on the capacity type battery 14 can be further reduced, and the capacity type battery 14 generates heat and deteriorates. It has an effect that can suppress. Hereinafter, the action and effect will be described in detail with reference to FIG.
[0022]
　FIG. 2 is a circuit configuration diagram around each power type battery and a schematic diagram showing smoothing of pulsating current. As shown in FIG. 2, near the inverter 12 corresponding to the motor generator 11, a capacitor 16 for smoothing the voltage fluctuation when the AC voltage is rectified is provided between the power battery 13 and the inverter 12. They are connected in parallel. Further, when the power type battery 13 is described by a detailed equivalent circuit model, the voltage source 101 expressing OCV (Open Circuit Voltage) and the DC resistance expressing the resistance of the electrolytic solution are represented by the resistor 102, and the ions in the electrolytic solution are expressed. The resistance component of the polarization derived from the concentration polarization or the like is represented by the resistor 103, and the polarization capacitance component is represented by the capacitor 104. In the present embodiment, one polarization term is used as a parallel circuit of the resistor 103 and the capacitor 104, but a plurality of polarization terms are actually connected in series. Here, it is simply set to one.
[0023]
　In the present embodiment, since the power type battery 13 is provided on a one-to-one basis with respect to the motor generator 11, for example, the power type battery 13 can be arranged at a position physically close to each motor generator 11, thereby. The power type battery 13 can be provided adjacent to the inverter 12. Therefore, the wiring 105 from the power type battery 13 to the inverter 12 shown by the dotted line in FIG. 2 can be shortened, and the power loss P caused by the resistance r of the wiring 105 can be reduced.
[0024]
　That is, the power loss P is calculated by the following equation (1). I in the equation (1) is a current value. When the physical distance from the power type battery 13 which is the power supply source to the inverter 12 which is the load becomes short, the resistance r of the wiring 105 becomes small, so that the power loss P decreases.

[0025]
　Further, since the power type battery 13 is provided 1: 1 with respect to the motor generator 11, it is possible to smooth the voltage and the current. That is, normally, a voltage and current that fluctuate periodically such as pulsating current 106 (see FIG. 2) flow into the battery side when switching the inverter. In this state, the load on the battery increases and heat generation increases. In order to suppress the heat generation of such a battery, it is necessary to smooth the pulsating current 106 and output a stable voltage and current.
[0026]
　On the other hand, in the present embodiment, as described above, a capacitor 16 for smoothing the voltage fluctuation when the AC voltage is rectified is arranged near the inverter 12, and the pulsating current 106 is passed through the capacitor 16. It can be smoothed to pulsating flow 107 (see FIG. 2).
[0027]
　In addition, since the power type battery 13 of the present embodiment has the above-mentioned capacitor 104, it is possible to further smooth the voltage and current. Therefore, the pulsating current 107 smoothed by the capacitor 16 is smoothed to the pulsating current 108 (see FIG. 2) when passing through the power type battery 13. As a result, the current load on the capacitance type battery 14 can be reduced, and the capacity of the capacitor 16 can be reduced by partially bearing the smoothing function of the capacitor 16 on the power type battery 13. When the power type battery 13 bears all the smoothing functions of the capacitor 16, the capacitor 16 can be omitted, which is effective in reducing the manufacturing cost.
[0028]
　By smoothing the pulsating current flowing into the capacity type battery 14 in this way, the load on the capacity type battery 14 can be reduced, and heat generation and deterioration of the capacity type battery 14 can be suppressed.
[0029]
　In this embodiment, there are four wheels and a motor generator is provided for each wheel. However, the present embodiment is not limited to these contents, and for example, one motor generator may drive two wheels. Good. Further, the number of wheels and the number of corresponding motor generators may be changed to any number as long as they are 2 or more. Further, in the present embodiment, an example including one capacity type battery 14 and four power type batteries 13 has been described, but the number of power type batteries 13 is not limited to four, and one capacity type battery and N ( It may be a combination with N ≧ 2) power type batteries.
[0030]
　Further, in the present embodiment, the structure of the in-wheel motor may be adopted. For example, it is conceivable to arrange the inverter 12 and the power type battery 13 inside the wheel of the wheel 2. By adopting the structure of the in-wheel motor in this way, it is possible to improve the electricity cost and effectively utilize the dead space in the wheel, so that the influence of the arrangement of the power type battery 13 on the space in the vehicle is suppressed. can do.
[0031]

　FIG. 3 is a schematic view showing an electric vehicle to which the composite power storage system according to the second embodiment is applied. The composite power storage system 10A of the present embodiment is different from the above-described first embodiment in that a plurality of inverters 12 are connected by a high-speed communication line 201, but other configurations are the same as those of the first embodiment.
[0032]
　As shown in FIG. 3, the four inverters 12 are connected to each other by the high-speed communication line 201 and connected to the ECU 15 via the high-speed communication line 201. The high-speed communication line 201 here is a communication line capable of transmitting and receiving data at high speed, and has, for example, a communication cycle of several tens of μsec or less. Then, the phase information of each inverter 12 obtained by high-speed communication is transmitted to the ECU 15. The ECU 15 controls each inverter 12 based on the transmitted phase information of each inverter 12.
[0033]
　According to the composite power storage system 10A of the present embodiment, the same effects as those of the first embodiment described above can be obtained, and since each inverter 12 is connected by the high-speed communication line 201, each of the inverters 12 is connected by the high-speed communication line 201. It is possible to reduce the current load on the capacitive battery 14 while taking into account the load current of the motor generator 11.
[0034]
　More specifically, at present, the motor generator 11 is driven by AC power having a frequency of about 10 kHz. Therefore, the pulsating current described in FIG. 2 according to the first embodiment also has a frequency of about 10 kHz. When this is smoothed, the pulsating flow 108 (see FIG. 2) is obtained, but the load current of a certain frequency still flows through the capacitive battery 14. When the ECU 15 does not control the inverters 12 in consideration of each other's state, the load currents from the motor generators 11 are in the same phase, so that the load current is four times the current of each motor generator 11 (motor). (When there are four generators 11).
[0035]
　If the load current is a perfect sine wave, the load from each motor generator 11 is calculated by the following formula (2), and the load on the capacitive battery 14 is calculated by the following formula (3). In equations (2) and (3), In is the load current from any motor generator 11 to the capacitive battery 14, ω is the frequency, t is the time, and A is the amplitude. Itotal is the sum of the load currents from the four motor generators 11 and is the load current applied to the capacitive battery 14.

[0036]
　On the other hand, by communicating the control current phases of the inverters 12 with each other by the high-speed communication line 201, the phases can be intentionally shifted. When the phase of each motor generator 11 is shifted by φ, Itotal is calculated by the following equation (4).

[0037]
　Then, if φ is set to π / 2, for example, the load currents cancel each other out, and Itotal becomes 0. That is, the current load on the capacitive battery 14 is eliminated.
[0038]
　Since the load current output from each motor generator 11 is not an ideal sine wave, it is difficult to completely cancel each load current, and the smoothing of the load is as shown in FIG. The figure above the arrow in FIG. 4 shows an image of the load current input to each power type battery 13. Each pulsating current is input to the power type battery 13 at a cycle corresponding to the drive frequency of the motor generator 11. This pulsating current is also smoothed by the power type battery 13, but the components that cannot be completely removed are input to the capacity type battery 14. However, it is possible to cancel each pulsating current by shifting the phase in consideration of each other's states by high-speed communication. As a result, as shown in the figure below the arrow in FIG. 4, the load becomes more stable than the original pulsating current and is input to the capacity type battery 14, so that the load on the capacity type battery 14 can be reduced. Can be done.
[0039]
　Further, as the control circuit, a configuration is conceivable in which the phase synchronization circuit is partially improved and each phase difference is controlled to be the target φ. Originally, the phase-locked loop applies feedback control to set the phase of each signal to 0, but by applying feedback control so that the phase becomes φ, it is possible to shift to the target phase difference.
[0040]

　FIG. 5 is a schematic view showing an electric vehicle to which the composite power storage system according to the third embodiment is applied. The composite power storage system 10B of the present embodiment is different from the above-described first embodiment in that the first relay 301 is provided between the power type battery set 17 composed of the plurality of power type batteries 13 and the capacity type battery 14. However, other configurations are the same as those in the first embodiment.
[0041]
　Specifically, the four power-type batteries 13 constitute a power-type battery set 17. The power type battery set 17 corresponds to the "power type power storage device set" described in the claims. The power type battery set 17 and the capacity type battery 14 are connected by one first relay 301. The first relay 301 is a relay for controlling the capacitive battery 14, and its on / off operation is controlled by the ECU 15. The ECU 15 controls the first relay 301 based on, for example, voltage information of the power battery 13, SOC information, accelerator pedal angle information of the electric vehicle 1, speed information of the electric vehicle 1, and the like.
[0042]
　According to the composite power storage system 10B of the present embodiment, the same operation and effect as those of the first embodiment described above can be obtained, and the first relay 301 is provided between the power type battery assembly 17 and the capacity type battery 14. The load on the capacitive battery 14 can be further reduced.
[0043]
　More specifically, for example, when the energy of one power battery 13 is 1 kWh, the current electric vehicle 1 can travel about 10 km / kWh, so that the four power batteries 13 alone can travel 40 km. become. Therefore, it is possible to run only with these power type batteries 13 for a short time, and if the first relay 301 is turned off, the load on the capacity type battery 14 becomes zero.
[0044]
　Since such control is possible, for example, powered on when the voltage or the SOC of the battery 13 (State Of Charge) is equal to or less than a predetermined value, to perform control process by the first relay 301 to turn on
more capacity battery It is possible to reduce the load of 14. The control process here is a control process in which the energy shortage of the power type battery 13 is covered by the capacity type battery 14, and regeneration is performed by accelerator interlocking control in which the first relay 301 is turned on only when the accelerator pedal is depressed. Control processing that causes the power type battery 13 to bear all the burden, control processing that covers the energy shortage of the power type battery 13 by turning on the first relay 301 when the electric vehicle 1 is completely stopped, and the like can be mentioned. ..
[0045]
　Hereinafter, an example of the control process using the first relay 301 will be described with reference to FIG. The control process is executed by, for example, the ECU 15.
[0046]
　As shown in FIG. 6, in step S100, the control process is started and the calculation is started.
[0047]
　In step S101, the ECU 15 determines whether the accelerator pedal is depressed. If it is determined that the driver is pressing the accelerator pedal, the control process proceeds to step S102. On the other hand, if it is determined that the step is not stepped on, the control process proceeds to step S104. Whether or not the accelerator pedal is depressed is determined by the ECU 15 based on the signal of the accelerator pedal angle.
[0048]
　In step S102, the ECU 15 determines whether the voltage and SOC of the power battery 13 are out of the predetermined range. The predetermined range here is a control range determined based on the safe use range of the battery. For example, in the case of a battery whose deterioration progresses outside the usage range of 30 to 70% SOC, control is performed so as to keep the range. The same applies to the voltage. Then, when it is determined that the voltage and SOC of the power type battery 13 are out of the predetermined range, the control process proceeds to step S103. On the other hand, if it is determined that the range is not out of the predetermined range, the control process proceeds to step S104.
[0049]
　In step S103, the ECU 15 transmits a control signal to the first relay 301 to turn on the first relay 301. Therefore, the capacity-type battery 14 and the power-type battery set 17 are electrically connected, and power is supplied from the capacity-type battery 14 to the power-type battery 13. Step S103 corresponds to the case where the power load is small or the power type battery 13 is in a dangerous water area. At the timing of step S103, the power load is small, and power is supplied from the capacitance type battery 14 to the power type battery 13 to prevent energy shortage. Then, when step S103 is completed, the control process proceeds to step S105.
[0050]
　In step S104, the ECU 15 transmits a control signal to the first relay 301 to turn off the first relay 301. Step S104 corresponds to the case where the power load is large or the power can be borne only by the power type battery 13. At the timing of step S104, the load on the capacitive battery 14 can be reduced. Then, when step S104 is completed, the control process proceeds to step S105.
[0051]
　In step S105, the calculation ends. Then, such control processing is repeated every calculation cycle.
[0052]
　By controlling the first relay 301 so that the capacitance type battery 14 is not connected at the timing when the power load is large as described above, the load of the capacitance type battery 14 can be reduced.
[0053]

　FIG. 7 is a schematic view showing an electric vehicle to which the composite power storage system according to the fourth embodiment is applied. The composite power storage system 10C of the present embodiment is different from the above-described third embodiment in that a second relay 401 is further provided for each power type battery 13, but other configurations are the same as those of the third embodiment. ..
[0054]
　Specifically, the composite power storage system 10C further includes four second relays 401 provided one-to-one with respect to the four power batteries 13. Each power type battery 13 is connected to the capacity type battery 14 via the corresponding second relay 401. The second relay 401 is a relay for controlling the power type battery 13, and its on / off operation is controlled by the ECU 15. The ECU 15 controls the second relay 401 based on, for example, the voltage information of the power type battery 13, the SOC information, and the like.
[0055]
　According to the composite power storage system 10C of the present embodiment, the same effects as those of the third embodiment described above can be obtained, and four second relays 401 provided one-to-one with respect to the four power type batteries 13 are provided. Further, since each power type battery 13 is connected to the capacity type battery 14 via the second relay 401, the power load from the power type battery 13 can be distributed.
[0056]
　For example, in the third embodiment described above, since only the first relay 301 is controlled, all the loads from the power type batteries 13 are input to the capacity type batteries 14 at the same time. On the other hand, by adopting the configuration of the present embodiment, the timing of inputting the load of each power type battery 13 can be shifted, so that sudden power output from the capacity type battery 14 can be prevented.
[0057]
　Hereinafter, the control process for shifting the load timing will be described with reference to FIG. The control process is performed by, for example, the ECU 15.
[0058]
　As shown in FIG. 8, in step S200, the control process is started and the calculation is started.
[0059]
　In step S201, the ECU 15 determines whether the voltage and SOC of the first power battery 13 are out of the corresponding predetermined ranges. Here, the predetermined range corresponding to this is the control range corresponding to the first power type battery 13. Therefore, the predetermined range corresponding to the second power type battery 13 is the control range corresponding to the second power type battery 13, and the predetermined range corresponding to the Nth power type battery 13 is N pieces. This is the control range corresponding to the power type battery 13 of the eye. The predetermined range corresponding to each power type battery 13 may be the same control range or may be a different control range. The order of the power type batteries 13 has no determination rule or the like, and is appropriately determined by, for example, the arrangement position of the power type batteries 13 in the electric vehicle 1.
[0060]
　Then, when it is determined that the voltage and SOC of the first power type battery 13 are out of the corresponding predetermined ranges, the control process proceeds to step S202. On the other hand, if it is determined that the range is not out of the predetermined range, the control process proceeds to step S203.
[0061]
　In step S202, the ECU 15 transmits a control signal to the second relay 401 corresponding to the first power type battery 13 to turn on the second relay 401. Therefore, the first power type battery 13 is in a state of being electrically connected to the capacity type battery 14 via the corresponding second relay 401 and the first relay 301, and one from the capacity type battery 14. Power is supplied to the power type battery 13 of the eye. On the other hand, in step S203, the ECU 15 transmits a control signal to the second relay 401 corresponding to the first power type battery 13 to turn off the second relay 401.
[0062]
　Subsequently, the same control processing is sequentially performed on the second and third power type batteries 13. Then, in step S204, the ECU 15 determines whether the voltage and SOC of the Nth (fourth in the present embodiment) power type battery 13 are out of the corresponding predetermined ranges.
[0063]
　Then, when it is determined that the voltage and SOC of the Nth power type battery 13 are out of the corresponding predetermined ranges, the control process proceeds to step S205. On the other hand, if it is determined that the range is not out of the predetermined range, the control process proceeds to step S206.
[0064]
　In step S205, the ECU 15 transmits a control signal to the second relay 401 corresponding to the Nth power type battery 13 to turn on the second relay 401. Therefore, the Nth power type battery 13 is electrically connected to the capacity type battery 14 via the corresponding second relay 401 and the first relay 301, and N pieces from the capacity type battery 14 Power is supplied to the power type battery 13 of the eye. Then, when step S205 is completed, the control process proceeds to step S207.
[0065]
　On the other hand, in step S206, the ECU 15 transmits a control signal to the second relay 401 corresponding to the Nth power type battery 13 to turn off the second relay 401. Then, when step S206 is completed, the control process proceeds to step S207.
[0066]
　In step S207, the calculation ends. Then, such control processing is repeated every calculation cycle.
[0067]
　By dividing the control predetermined range N by the power type battery 13 in this way, the timing at which the second relay 401 is turned on can be shifted. For example, by changing the predetermined range corresponding to the first power type battery 13 to SOC 30 to 70% and the predetermined range corresponding to the Nth power type battery 13 to SOC 35 to 75%, the power type battery 13 When the total SOC reaches about 35%, the second relay 401 corresponding to the Nth power type battery 13 is turned on, but the second relay 401 corresponding to the first power type battery 13 is turned off. Can be left as it is. Then, in the configuration of the third embodiment, since power is supplied to all the power type batteries 13, a large amount of power is supplied. However, by adopting the configuration of this embodiment, 1 / N of the total power load is supplied. Therefore, it is possible to shift the load timing of the capacitive battery 14.
[0068]

　FIG. 9 is a schematic view showing an electric vehicle to which the composite power storage system according to the fifth embodiment is applied. The composite power storage system 10D of the present embodiment is different from the fourth embodiment described above in that a DC / DC converter 501 is provided between the power type battery set 17 and the capacity type battery, but other configurations are different. This is the same as the fourth embodiment.
[0069]
　That is, the four power type batteries 13 constitute a power type battery set 17, and one DC / DC converter 501 is provided between the power type battery set 17 and the capacity type battery 14. The DC / DC converter 501 is controlled by the ECU 15. The ECU 15 controls the DC / DC converter 501 based on, for example, voltage information of the power battery 13, SOC information, accelerator pedal angle information of the electric vehicle 1, speed information of the electric vehicle 1, and the like.
[0070]
　According to the composite power storage system 10D of the present embodiment, the same effects as those of the fourth embodiment described above can be obtained, and the DC / DC converter 501 is provided between the power type battery assembly 17 and the capacity type battery 14. The composite power storage system 10D can be configured even if the voltages of the capacitance type battery 14 and the power type battery 13 are different. Further, by providing the DC / DC converter 501, for example, it is possible to control the power type battery 13 to continuously supply the electric power capable of constantly supplying the traveling from the capacity type battery 14, so that the load of the capacity type battery 14 can be controlled. Can be further reduced.
Description of the sign
[0071]
1 Electric vehicle, 2 wheels, 10, 10A, 10B, 10C, 10D combined power storage system, 11 motor generator, 12 inverter, 13 power type battery, 14 capacity type battery, 15 ECU, 16 capacitor, 17 power type battery set, 201 High-speed communication line, 301 1st relay, 401 2nd relay, 501 DC / DC converter
The scope of the claims
[Claim 1]
　In a composite power storage system that supplies DC power to a plurality of power supply targets,
　one capacity type battery and a plurality of power type power storage devices are provided, and the plurality of power type power storage devices are provided with
　respect to the plurality of power supply targets. A composite power storage system characterized in that it is provided one-to-one.
[Claim 2]
　The combined power storage system according to claim 1, wherein the plurality of power supply targets are a plurality of motor generators provided one-to-one with respect to the wheels of the vehicle.
[Claim 3]

　The composite power storage system according to claim 2, further comprising 　a plurality of inverters provided one-to-one with respect to the plurality of motor generators, and each power power storage device is provided adjacent to the corresponding inverter.
[Claim 4]
　The combined power storage system according to claim 3, wherein the plurality of inverters are connected by a high-speed communication line.
[Claim 5]

　Any one of claims 1 to 4, 　wherein the plurality of power-type power storage devices form a power-type power storage device set, and a first relay is provided between the power-type power storage device set and the capacity-type battery. The combined power storage system described in the section.
[Claim 6]
　A plurality of second relays provided one-to-one with respect to the plurality of
　power-type power storage devices are provided, and each power-type power storage device is connected to the capacity-type battery via the corresponding second relay. The combined power storage system according to any one of claims 1 to 5.
[Claim 7]

　Any one of claims 1 to 6, 　wherein the plurality of power type power storage devices form a power type power storage device set, and a DC / DC converter is provided between the power type power storage device set and the capacity type battery. The combined power storage system according to one item.