JPWO2018061400A1 - Combined storage system - Google Patents

Abstract

Provided is a composite power storage system capable of relaxing restrictions on characteristics of a power supply target while using both a power type battery and a capacity type battery. The composite power storage system according to the present invention stores DC power in the power type battery 13 and the capacity type battery 15 and outputs the stored DC power to the power supply targets 11 and 12. The DC power to be supplied is output to the power supply targets 11 and 12 via the power control unit 14, and the capacitive battery 15 is connected in parallel to the power type battery 13 via the power control unit 14.

Description

  The present invention relates to a composite power storage system in which a capacitive battery and a power battery are used in combination.

  In electric vehicles, a single type of battery is used to supply electric energy. As this battery, a capacity type battery in which the capacity (Ah) performance is emphasized is used. However, in the case of the capacity type battery alone, a large current flows at the time of acceleration and deceleration of the electric vehicle, so that the battery temperature becomes high and the battery life becomes short.

  On the other hand, the prior art described in Patent Document 1 is known. In this prior art, a power type battery with an emphasis on power performance is connected in parallel to a capacity type battery via a DCDC converter (DC-DC converter). As described above, in the conventional technology, a composite power storage system is used in which a capacitive battery and a power battery are used in combination. As a result, the charge / discharge current to the capacity type battery can be suppressed, and the circulating current can be suppressed.

JP 2012-235610 A

  In the above prior art, the capacitive battery is directly connected to the inverter. In this case, the voltage ranges of the inverter and the motor need to be within the operating voltage range of the capacitive battery, but since the operating voltage range of the capacitive battery is generally narrow, the torque constant of the motor (conversion of torque and current The constant must be lowered, which limits the motor characteristics. If the torque constant is lowered, the regenerative voltage is lowered and the efficiency of the electric vehicle is lowered. In addition, since the power type battery is connected to the DCDC converter, it is necessary to increase the power capacity of the DCDC converter, which increases the cost of the DCDC converter.

  Therefore, the present invention provides a composite power storage system capable of alleviating restrictions on the characteristics of the power supply target while using both a power type battery and a capacity type battery.

  In order to solve the above problems, the combined storage system according to the present invention stores direct current power in a power type battery and a capacity type battery, and outputs the stored direct current power to a power supply target. The direct current power stored in is output to the power supply target via the power control device, and the capacitive battery is connected in parallel with the power battery via the power control device.

  Further, in order to solve the above problems, the combined storage system according to the present invention stores direct current power in a power type battery and a capacity type battery, and outputs the stored direct current power to a power supply target. The type battery and the capacity type battery are connected in parallel, and the DC power stored in the power type battery and the capacity type battery is output to the power supply target via the power control device.

  According to the present invention, the power of the capacitive battery, or the power of the power battery and the capacitive battery is output to the power supply target through the power control device. , Restrictions on the performance of the power supply target can be relaxed.

  Problems, configurations, and effects other than those described above will be clarified by the description of the embodiments below.

BRIEF DESCRIPTION OF THE DRAWINGS The structure of the composite electrical storage system which is Example 1 of this invention, and the electric vehicle carrying it is shown. It is a flowchart which shows an example of the control logic performed by ECU. It is a flowchart which shows an example of the control logic performed by ECU. It is a flowchart which shows an example of the control logic performed by ECU. The structure of the composite electrical storage system which is Example 2 of this invention, and the electric vehicle carrying it is shown. The voltage range of series connection of a power type battery and a capacity type battery is shown. The modification of Example 1 is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings in Examples 1 to 3 below. In each of the drawings, the same reference numerals indicate the same constituent elements or constituent elements having similar functions.

  FIG. 1 shows the configuration of a composite power storage system that is Embodiment 1 of the present invention, and an electric vehicle equipped with the same.

  As shown in FIG. 1, the electric vehicle 10 includes a composite power storage system including a power battery 13 and a capacitive battery 15 connected in parallel to the power battery 13 via a DCDC converter 14 which is a power control device. . The combined storage system is connected to motor generator 11 via inverter 12. Therefore, the power battery 13 is directly connected to the inverter 12 without the DC-DC converter, and the capacitive battery 15 is connected to the inverter 12 via the DC-DC converter 14. The inverter 12, the power battery 13, the DCDC converter 14, and the capacitive battery 15 are controlled by an ECU 16 ("ECU" is an abbreviation of "Electronic Control Unit").

  Here, the motor generator 11 is an AC machine, for example, an induction machine or a synchronous machine.

Direct-current power is output from the power type battery 13 directly to the inverter 12 through the DC-DC converter 14 from the capacity type battery 15. The inverter 12 converts DC power supplied from the power battery 13 and the capacity battery 15 into three-phase AC power. The motor generator 11 is rotationally driven as a motor by the three-phase AC power output from the inverter 12.
Thus, the electric vehicle 10 travels. The DCDC converter 14 steps up or down the voltage of the capacitive battery 15 to the operating voltage of the inverter 12 or the motor generator 11.

  When the power supplied to the motor generator 11 is insufficient with the capacity battery 15 alone, the electric power is supplied from the power battery 13 to the motor generator 11 via the inverter 12 also when, for example, the electric vehicle 10 is accelerated. .

  At the time of deceleration or braking of the electric vehicle 10, that is, at the time of regeneration of the motor generator 11, 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 battery 13 or stored in the capacitive battery 15 via the DC-DC converter 14.

  When the electric vehicle 10 is parked, the capacitive battery 15 and the power battery 13 are charged by a charging device (not shown).

  Motor generator 11 in FIG. 1 may be configured by separate motors and generators.

  The power type battery 13 can flow a larger current than the capacity type battery 15, but has a lower capacity (Ah). As such a power type battery 13, for example, a lithium ion battery, a nickel hydrogen battery or the like is applied. Further, instead of the power type battery 13, a power storage device (in other words, a power type power storage device) such as a lithium ion capacitor or an electric double layer capacitor having high output characteristics similar to this may be used. Hereinafter, these batteries and capacitors are collectively referred to as "power type batteries".

  The capacity type battery 15 has a higher internal resistance than the power type battery 13 and can not flow a large current, but has a high capacity (Ah). As such a capacity type battery 15, a lithium ion battery, a lithium ion semi-solid battery, a lithium solid battery, a lead battery, a nickel zinc battery or the like is applied. The lithium ion battery used as the power type battery 13 and the lithium ion battery used as the capacity type battery 15 are different in configuration such as electrode materials.

  As described above, according to the first embodiment, by using the power battery 13 and the capacitive battery 15 together, the battery output can be increased while the battery capacity is secured, or the battery output can be secured as the entire battery to be used. However, the battery capacity can be increased. Furthermore, when using the power type battery 13 and the capacity type battery 15 together, among these, the capacity type battery 15 whose operating voltage range is narrower than the power type battery 13 is connected to the DCDC converter 14. Thus, the output voltage from the capacitive battery 15 can be converted according to the operating voltage of the motor generator 11, and the regenerative voltage of the motor generator 11 can be converted according to the charging voltage of the capacitive battery 15. That is, since the narrowness of the operating voltage range of capacitive type battery 15 is compensated, the restriction on the set value of the torque constant of motor generator 11 can be relaxed. Therefore, since the regenerative voltage can be increased, the efficiency of the electric vehicle 10 is improved. In addition, since the power capacity of the DCDC converter can be reduced, the cost of the DCDC converter can be reduced.

  Next, the series number of the power type battery 13 will be described.

  In the first embodiment, the relationship between the number of series connected power batteries and the voltage range of the motor generator 11 is expressed by the equation (1). In Equation (1), since each voltage range indicates a set of voltage values in this voltage range, so to speak, a set symbol “⊃” is used.

(Power type battery voltage range) × (number of power type battery in series) ⊃ (Motor voltage range) (1)
That is, in the first embodiment, a voltage range obtained by multiplying the voltage range of one power type battery by several times in series, that is, a voltage range of series connection of power type batteries covers the entire voltage range of the motor.

  For example, it is assumed that a lithium ion capacitor is used as a power type battery, the voltage range of the lithium ion capacitor is in the range of 2.2 V to 3.8 V, and the number of lithium ion capacitors in series is 14 in series. In this case, the voltage range of the motor is set to 30.8 V to 53.2 V, and the torque constant of the motor is set to be in this voltage range. In addition, it is assumed that the voltage range of the motor is 34V to 49V. In this case, if the series number of lithium ion capacitors is 13 series, the voltage range of series connection of lithium ion capacitors is 28.6 V to 49.4 V, which covers the voltage range of the motor.

  As described above, by setting the number of series-connected power batteries, the torque constant of the motor can be increased, and the regeneration efficiency is improved.

  The DCDC converter 14 in the first embodiment may use a bidirectional converter, or use a boost converter or a buck converter in one direction (direction from the capacitive battery 15 to the inverter 12). Also good. In the case of using a step-up DC-DC converter, “(voltage of inverter)> (maximum voltage of capacity battery) × (number of capacity batteries connected in series)”. When a step-down type is used, “(voltage of inverter) <(voltage minimum of capacity type battery) × (number of capacity type battery in series)”. A known chopper circuit can be used as the circuit configuration of the bidirectional DC DC converter, one-direction step-up DC DC converter, and one-direction step-down DC DC converter (for example, "Atsuo Kawamura," Prototype of Eco Future Electric Vehicle And performance evaluation test ", DENSO Technical Review, Vol. 16, 2011, p. 3-8".

  As a modified example of the first embodiment, a current limiting circuit may be used instead of the DCDC converter having the above-described step-up or step-down function. Such a modification is shown in FIG.

  As shown in FIG. 7, the DCDC converter 14 in the electric vehicle 10 of FIG. In the current limiting circuit 71, a P-channel MOSFET 72 and an N-channel MOSFET 73 are connected in series, and these MOSFETs are turned ON / OFF by a gate driver 74. The on / off signal which is a command signal of the gate driver 74 is an on / off logic signal from the ECU 16. By turning on and off the switch composed of the P-channel MOSFET 72 and the N-channel MOSFET 73, the current value is limited to a desired current value on average over time.

  FIG. 2 is a flowchart showing an example of control logic executed by the ECU 16. In addition, a bidirectional converter is used as the DCDC converter 14. The control logic of FIG. 2 is executed by the ECU 16 from the ignition on of the electric vehicle 10 to the end of traveling. The ECU 16 executes the control logic of FIG. 2 in accordance with a computer program installed in advance.

  First, in step S21, an SOC (abbreviation of State Of Charge, indicating a charging rate) is received from the power type battery 13. The power type battery is packed, and the microcomputer (not shown) mounted in the pack calculates the SOC and transmits it to the ECU. The ECU and the microcomputer are connected by a communication line (for example, CAN: abbreviation for Controller Area Network), and the SOC is transmitted to the ECU via the communication line.

  Next, in step S22, it is determined whether or not the electric vehicle is in power running (corresponding to discharging the battery) (regeneration, ie corresponding to charging of the battery). If power running, the process proceeds to step S23. If not power running, the process proceeds to step S26. Transfer the process. Whether or not power running is determined based on an accelerator request from the driver driving the electric vehicle, deceleration, and the like. In the case of power running, the power flows from the battery side to the side of the inverter and motor generator, and the DC power stored in the battery is supplied to the side of the inverter and motor generator and consumed. Also, in the case of non-power running, that is, when power is generated on the side of the inverter and motor generator, the generated power is stored on the side of the inverter and motor generator.

  In step S23, it is determined whether the SOC of the power type battery is equal to or less than a constant SOC_L. If it is equal to or less than SOC_L, the process proceeds to step S24. If it is not equal to or less than SOC_L, the process proceeds to step S25. The constant SOC_L is a constant set in advance, and when the minimum voltage of the inverter 12 is VL, it is a value exceeding the SOC of the power type battery corresponding to the voltage of (VL / number of series power type batteries). That is, SOC_L indicates the lower limit value of the SOC of the power type battery in the control logic of FIG.

  For example, if the minimum voltage of the inverter is 35 V and the number of series-connected power batteries is 14, the minimum voltage per power battery is 2.5 V. Here, a lithium ion capacitor is used as a power type battery, and one open circuit voltage thereof is 2.2 V with respect to SOC 0% and 3.8 V with respect to SOC 100%, and the open circuit voltage is in a linear relationship with SOC In this case, the minimum SOC of the lithium ion capacitor is 18.75%. In this case, SOC_L is set to a value greater than 18.75%, for example 20%.

  In step S24, the output current of the DC-DC converter (current on the inverter side) is matched with the required current of the motor and the inverter (this value is set in the ECU based on the accelerator request from the driver). Zero the current from. That is, since power running and SOC are equal to or lower than the lower limit SOC_L, the discharge of the power type battery is prohibited. At this time, the ECU sends a command to the DCDC converter to output a current that matches the required current. After the step S24 ends, the process moves to the step S28.

  In step S25, the output current of the DCDC converter is set to "required current-min (power type battery maximum current, required current)" in order to apply the current limiter of the power type battery. Therefore, in a normal state in which the required current is less than the maximum current of the power battery and the required current can be supplied by the power battery, the power battery is charged with power, and the output current of the DCDC converter is set to zero. Zero the current. At this time, the ECU sends a command for commanding the DCDC converter to make the output current zero. Further, when the required current is larger than the maximum current of the power type battery, the output current of the DCDC converter is set to the difference between the required current and the maximum power type battery current so that the capacity type battery is also charged. At this time, the ECU sends a command to the DCDC converter to make the output current match the difference. After the step S25 ends, the process moves to the step S28.

  In step S26, it is determined whether the SOC of the power type battery is greater than or equal to a constant SOC_H. If it is greater than SOC_H, the process proceeds to step S27. If not, the process proceeds to step S29. The constant SOC_H is a constant set in advance, and when the maximum voltage of the inverter is VH, it is a value lower than the SOC of the power type battery corresponding to the voltage of “VH / power type battery series number”. That is, SOC_H indicates the upper limit value of the SOC of the power battery in the control logic of FIG.

  For example, if the maximum voltage of the inverter is 52 V and the number of series-connected power batteries is 14, the maximum voltage per power battery is about 3.7 V. Here, a lithium ion capacitor is used as a power type battery, and one open circuit voltage thereof is 2.2 V with respect to SOC 0% and 3.8 V with respect to SOC 100%, and the open circuit voltage is in a linear relationship with SOC In this case, the maximum SOC of the lithium ion capacitor is 93.75%. In this case, SOC_H is set to a value less than 93.75%, for example 90%.

  In step S27, the output current of the DCDC converter (current on the output side, that is, the current on the inverter side) is the required current of the motor and inverter, that is, the regenerative current (this value is set in the ECU based on the deceleration request from the driver). And the charging current of the power type battery is made zero. That is, since the regeneration is performed and the SOC is equal to or higher than the upper limit SOC_H, charging of the power type battery is inhibited, and the regenerative power is recovered by the capacity type battery. At this time, the ECU sends a command to the DCDC converter to make the output current (current on the output side, that is, the inverter side) coincide with the required current (regenerative current). After completion of step S27, the process moves to step S28.

  In step S29, in order to apply the current limiter of the power type battery, the output current of the DCDC converter is set to "required current-min (power type battery maximum current, required current)". Therefore, in the normal state where the power type battery can absorb the required current (regenerative current), the power type battery side recovers the regenerative power, and the charging current of the capacity type battery is made zero. At this time, the ECU sends a command to the DC-DC converter to make the output current zero and make the regenerative power recovered by the capacitive battery zero. When the required current is larger than the power type battery maximum current, the output current of the DCDC converter is set to the difference between the request current (regenerative current) and the power type battery maximum current. At this time, the ECU causes the DCDC converter to make the absorbed current equal to this difference, and sends a command instructing the capacitive battery to recover a part of the regenerative power. After completion of step S29, the process moves to step S28.

  In step S28, it is determined whether the ignition has been turned off, that is, whether the traveling has ended. If the ignition is not off, that is, if it is not the end of traveling, the processing after step S21 is repeated. When the ignition is off, that is, when the traveling is ended, the series of processing is ended.

  The value of the power type battery maximum current in steps S25 and S29 is set to, for example, the maximum current at the time of discharge or charge described in the catalog of the power type battery.

  FIG. 3 is a flowchart showing an example of control logic executed by the ECU 16. In this example, a DCDC converter 14 having one direction is used. The control logic of FIG. 3 is executed by the ECU 16 from the ignition on of the electric vehicle 10 to the end of traveling. The ECU 16 executes the control logic of FIG. 3 in accordance with a computer program installed in advance.

  In step S31, it is determined whether the electric vehicle is in power running, and if it is power running, the process proceeds to step S33, and if it is not power running (regeneration), the process proceeds to step S32.

  In step S32, since regeneration is performed, charging of the capacitive battery is prohibited, and in order to recover regenerative energy by the power battery, a command to turn off the operation is sent to the DCDC converter, and the process proceeds to step S34. .

  In step S33, although it is a power running, the output current of the DCDC converter is set to "required current-min (power type battery maximum current, required current)" in order to apply the current limiter of the power type battery. Therefore, in a normal state where the required current can be supplied by the power type battery, the power type battery is made to bear the power for powering, the output current of the DCDC converter is set to zero, and the current of the capacitive type battery is made zero. At this time, the ECU sends a command for commanding the DCDC converter to make the output current zero.

  Further, when the required current is larger than the power type battery maximum current, the output current of the DC-DC converter is set to the difference between the required current and the power type battery maximum current so that the capacity type battery can also bear power. At this time, the ECU sends a command to the DCDC converter to make the output current match the difference. After the step S33 ends, the process moves to the step S34.

  In step S34, it is determined whether the ignition has been turned off, that is, whether the traveling has ended. If the ignition is not off, that is, if it is not the end of traveling, the processing after step S31 is repeated. When the ignition is off, that is, when the traveling is ended, the series of processing is ended.

  According to the control logic of FIG. 3, a large current can be shared by the power type battery as much as possible.

  Note that, instead of step S33 in FIG. 3, the output current of the DCDC converter may be “required current × η”. η is a constant from 0 to 1, and may be, for example, 2/3.

  In the example of FIG. 3, the SOC of the power type battery may possibly reach the upper limit value or the lower limit value. In this case, control logic as shown in FIG. 4 may be used (in this case, a bi-directional DCDC converter is used).

  FIG. 4 is a flowchart showing an example of control logic executed by the ECU 16. In addition, a bidirectional converter is used as the DCDC converter 14. The control logic of FIG. 4 is executed by the ECU 16 from the ignition on of the electric vehicle 10 to the end of traveling. The ECU 16 executes the control logic of FIG. 4 in accordance with a computer program installed in advance.

  First, in step S41, the SOC is received from the power battery.

  Next, in step S42, it is determined whether the electric vehicle 10 is power running (corresponding to discharge as a battery) (becomes regeneration and corresponds to charging as a battery), and if power running to step S43, otherwise The process moves to step S46. Whether the power is running or not is determined in the ECU from the accelerator request from the driver and the deceleration.

  Next, in step S43, it is determined whether the SOC of the power type battery is less than or equal to a constant SOC_L. If true, the process proceeds to step S44, otherwise the process proceeds to step S45. The constant SOC_L is a preset constant.

  In step S44, the output current of the DCDC converter (the current to be supplied to the inverter) is made equal to the required current of the motor and the inverter (this value is determined by the accelerator request from the driver in the ECU). Set the current to 0. This is to prohibit the discharge of the power type battery because the power running is performed and the SOC is equal to or less than the lower limit SOC_L. It then sends commands to the DCDC converter. After completion of step S44, the process proceeds to step S49.

  In step S45, the output current of the DC-DC converter is set as "required current-min (power type battery maximum current, required current)", and the power type battery side is normally shared with electric power to set the current of the capacitive type battery to zero. It then sends commands to the DCDC converter. After the end of step S45, the process proceeds to step S49. Further, the output current of the DC-DC converter may be set as required current × constant (between 0 and 1).

  In step S46, it is determined whether the SOC of the power type battery is greater than or equal to a constant SOC_H, and if new, the process proceeds to step S47, otherwise the process proceeds to step S48. The constant SOC_H is a constant set in advance.

  In step S47, the regenerative power is charged only to the capacitive battery. It then sends commands to the DCDC converter. After completion of step S47, the process proceeds to step S49.

  In step S48, the output current of the DC-DC converter is set as "required current-min (power type battery maximum current, required current)", and the power type battery side is normally shared with electric power to set the current of the capacitive type battery to zero. It then sends commands to the DCDC converter. After the end of step S48, the process proceeds to step S49. Note that the output current of the DC-DC converter may be set as “required current × constant (between 0 and 1)”.

  In step S49, it is determined whether the ignition is turned off (traveling end). If the traveling is not ended, the processing from step S41 is repeated, and if it is turned off, the series of processing in FIG. 4 is ended.

  FIG. 5 shows the configuration of a composite power storage system that is Embodiment 2 of the present invention and an electric vehicle equipped with the same. The differences from the first embodiment will be mainly described below.

  In the second embodiment, unlike the first embodiment, the capacitive battery 15 and the power battery 13 are connected directly, ie, always in parallel, without the power control device, and both batteries are connected via the DCDC converter 14. And the inverter 12 is connected. That is, in the second embodiment, the capacity type battery 15 and the power type battery 13 constitute an assembled battery, and both the power type battery 13 and the capacity type battery 15 output DC power via the DCDC converter 14. This simplifies control of the DCDC converter 14.

  According to the configuration of the composite power storage system of the second embodiment, it is possible to increase the battery output while securing the battery capacity as the entire battery to be used, or to increase the battery capacity while securing the battery output. Furthermore, in the complex storage system of the second embodiment, a DCDC converter is connected to the power type battery 13 and the capacity type battery 15 to output a current or voltage according to the inverter or motor / generator which is the power supply target. Can.

  Next, the series number of batteries will be described.

  The relationship between the number of series connections of power type batteries and the number of series connections of capacitive type batteries in the second embodiment is expressed by equation (2). The set symbol “記号” is used in the same manner as the equation (1).

(Power-type battery voltage range) × (number of power-type battery series) × (capacitance-type battery voltage range) × (number of capacity-type battery series) (2)
For example, a lithium ion capacitor is used as a power type battery, and the voltage range is 2.2 V (SOC 0%) to 3.8 V (SOC 100%), and the number of series is 90. In addition, a lithium ion semi-solid battery is used as a capacity type battery, and the voltage range is 3.0 V (SOC 0%) to 4.2 V (SOC 100%), and the number of series is 80. In this example, the voltage range of series connection is 198 V to 342 V for power type batteries (lithium ion capacitors) and 240 V to 336 V for capacitive type batteries (lithium ion semi-solid batteries). Therefore, the equation (2) is satisfied. In this case, the SOC of the capacity type battery can be used from 0% to 100%. And SOC of a power type battery will be between 29.1% and 95.8%. Thus, the battery capacity can be increased while securing the battery output.

The case where the power type battery has a limited range of SOC (for example, in consideration of deterioration) is as follows. For example, it is assumed that the SOC range of the power type battery is in the range of 20% to 80%, and the SOC function of the steady value of OCV (Open Circuit Voltage: abbreviation of open circuit voltage) at this time is F (SOC). In this case, the voltage range of one power type battery is from F (20%) to F (80%). The battery series number can be set using equation (2) within this voltage range.
The same applies to the case where the SOC range of the capacitive battery is limited.

  Next, the serial number in the case where the relationship of equation (2) is not satisfied will be described.

  FIG. 6 shows the voltage range of the series connection of a powered battery and a capacitive battery.

  As shown in FIG. 6, the voltage range of the series connection of the power type battery and the voltage range of the series connection of the capacity type battery are not in the inclusion relation as shown by the equation (2) although there is an overlapping portion. In this case, the voltage width of the usable range (63) is defined as "upper limit value (64)-lower limit value (65)" while taking into consideration the voltage range of the power supply target and the performance of the battery used. The number of series is such that the voltage width is increased. Alternatively, the series number is such that “the SOC of the capacitive battery corresponding to the upper limit (64) −the capacitive SOC corresponding to the lower limit (65)” is increased.

  In the third embodiment, although not shown, the motor generator 11 in FIGS. In connection with this, the inverter 12 in the same figure is made into the DCDC converter comprised by the chopper circuit etc. The speed of the motor generator, which is a DC machine, is controlled using this DCDC converter.

  The present invention is not limited to the embodiments described above, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. In addition, it is possible to add, delete, and replace another configuration for part of the configuration of each embodiment.

  For example, the combined storage system in each of the embodiments described above can be applied to a building management system, a plug-in hybrid vehicle, a hybrid vehicle, a ship, a railway vehicle, and the like.

DESCRIPTION OF SYMBOLS 10 ... Electric vehicle, 11 ...... Motor generator, 12 ... Inverter, 13 ... Power type battery, 14 ... DCDC converter, 15 ... Capacity type battery, 16 ... ECU, 71 ... Current-limit circuit, 72 ... P channel MOSFET, 73 ... N-channel MOSFET, 74 ... gate driver

Claims (16)

In a combined storage system in which DC power is stored in a power type battery and a capacity type battery, and the stored DC power is output to a power supply target,
The DC power stored in the capacitive battery is output to the power supply target via a power control device,
The composite power storage system, wherein the capacity type battery is connected in parallel with the power type battery via the power control device. The composite storage system according to claim 1, wherein the voltage range and the number of series of the power type battery and the voltage range of the power supply target satisfy the formula (1).
Voltage range of power type battery × number of series of power type battery 電 圧 voltage range of power supply target ... (1) In the combined storage system according to claim 1,
The power control device
If the current to be supplied is equal to or less than the maximum current of the power battery, the output current is made zero,
If the current to be supplied is larger than the maximum current of the power battery, the output current is made to coincide with the difference between the current to be supplied and the maximum current of the power battery. system. In the combined storage system according to claim 1,
The power control device
A composite power storage system characterized by matching an output current to a constant (= 0 to 1) times of a current to be supplied with power. In the combined storage system according to claim 1,
The power control device
When the SOC (State Of Charge) of the power type battery is larger than a predetermined lower limit value,
If the current to be supplied is equal to or less than the maximum current of the power battery, the output current is made zero, and if the current to be supplied is larger than the maximum current of the power battery, the output current is Match the difference between the current to be supplied and the maximum current of the power battery,
A complex power storage system characterized in that when the SOC (State Of Charge) of the power type battery is equal to or less than the predetermined lower limit value, the output current is made to coincide with the current to be supplied. In the combined storage system according to claim 3,
The power control device
A composite storage system characterized by turning off operation when the power supply target generates power. In the combined storage system according to claim 5,
The power control device
When the SOC (State Of Charge) of the power type battery is smaller than a predetermined upper limit value,
If the current from the power supply target is equal to or less than the maximum current of the power type battery, the output current is made zero, and if the current from the power supply target is larger than the maximum current of the power type battery, the output current is Match the difference between the current due to the power supply target and the maximum current of the power battery,
A composite power storage system characterized in that when the SOC (State Of Charge) of the power type battery is equal to or more than the predetermined upper limit value, the output side current is made to match the current by the power supply target. In the combined storage system according to claim 1,
The complex power storage system is characterized in that the power control device is composed of a DCDC converter. In the combined storage system according to claim 1,
The complex power storage system is characterized in that the power control device is composed of a current limiting circuit. In the combined storage system according to claim 1,
The complex power storage system characterized in that the power supply target is an inverter and a motor generator driven by the inverter. In the combined storage system according to claim 1,
The combined storage system characterized in that the power supply target is a direct current machine. In the combined storage system according to claim 1,
The power type battery is one of a lithium ion battery, a nickel hydrogen battery, a lithium ion capacitor and an electric double layer capacitor,
The combined storage system according to claim 1, wherein the capacitive battery is one of a lithium ion battery, a lithium ion semi-solid battery, a lithium solid battery, a lead battery and a nickel zinc battery. In a combined storage system in which DC power is stored in a power type battery and a capacity type battery, and the stored DC power is output to a power supply target,
The power battery and the capacity battery are connected in parallel,
The DC power stored in the power type battery and the capacity type battery is output to the power supply target via a power control device. In the combined storage system according to claim 13,
A composite storage system characterized in that a voltage range and a series number of the power type battery and a voltage range and a series number of the capacitive type battery satisfy the formula (2).
Power type battery voltage range × power type battery series number × capacity type battery voltage range × capacity type battery series number ... (2) In the combined storage system according to claim 13,
In the overlapping voltage range of “(voltage range of power type battery) × (number of series of power type batteries)” and “(voltage range of capacitive type battery) × (number of series of capacitive type batteries)” A combined storage system characterized in that the number of series connection of the power type battery and the number of series connection of the capacity type battery are set based on the above. In the combined storage system according to claim 13,
In the overlapping voltage range of “(voltage range of power type battery) × (number of series of power type batteries)” and “(voltage range of capacitive type battery) × (number of series of capacitive type batteries)” The number of series connection of the power type battery and the number of series connection of the capacity type battery are set based on the difference between the SOC corresponding to the upper limit value and the SOC corresponding to the lower limit value in the voltage range. Power storage system.

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