Power supply system and program

Abstract

A power supply system (30, 230, 330, 430) is connected to a high-voltage power supply line (H1) to which a high-voltage load (71) is connected and a low-voltage power supply line (H2) to which a low-voltage load (72) is connected, and includes a plurality of power storage units (31-33). A power supply system (30, 230, 330, 430) has a switching unit (SW) that switches the connection state of a plurality of power storage units, and a switching control unit (100) that controls the switching unit. The switch control unit is capable of setting a first connection state in which some or all of the plurality of power storage units are connected between a high-voltage power supply line and a high-voltage ground line (L1), and a third connection state in which energization between the high-voltage ground line and a low-voltage ground line (L2) is cut off. A part of the plurality of power storage units is connected between the low-voltage power supply line and the low-voltage ground line.

Description

Citation of Related Applications

[0001] This application is based on Japanese Patent Application No. 2022-177698 filed on November 4, 2022, the contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to a power supply system and a program. Background Art

[0003] Conventionally, as described in Patent Document 1, a vehicle-mounted power supply device including a plurality of power storage units has been known. When an abnormality occurs on the high-voltage side of the power storage unit, the vehicle-mounted power supply device cuts off the power supply between the power storage unit on the low-potential side and supplies power from the normal power storage unit on the low-potential side to low-voltage loads. Thereby, it is possible to suppress the non-supply of power to low-voltage loads. Prior Art Documents Patent Documents

[0004] Patent Document 1: Japanese Patent Laid-Open No. 2018-148733 Summary of the Invention

[0005] However, in the vehicle-mounted power supply device of the first embodiment, due to the circuit structure, when there is no abnormality in the power storage unit, it is not possible to cut off the connection between the power storage unit on the high-voltage side and the power storage unit on the low-voltage side and supply power from the power storage unit on the high-voltage side to high-voltage loads, and supply power from the power storage unit on the low-voltage side to low-voltage loads.

[0006] A main object of the present disclosure is to provide a power supply system and a program capable of flexibly changing the power supply source.

[0007] The power supply system for solving the above technical problems is connected to a high-voltage power line connected to a high-voltage load and a low-voltage power line connected to a low-voltage load, and includes a plurality of power storage units, The above power supply system includes: a switch unit that switches the connection state of the plurality of power storage units; and a switch control unit that controls the switch unit, The switch control unit sets a first connection state and a third connection state, In the first connection state, a part or all of the plurality of power storage units are connected between the high-voltage power line and the high-voltage ground line, In the third connection state, the power supply between the high-voltage ground line and the low-voltage ground line is cut off, and a part of the plurality of power storage units is connected between the low-voltage power line and the low-voltage ground line.

[0008] With this structure, the power supply source can be flexibly changed.

[0009] The program for solving the above technical problem is implemented by the control device of the power supply system. The above power supply system is connected to a high-voltage power line connected to a high-voltage load and a low-voltage power line connected to a low-voltage load, and includes a plurality of power storage units. The above program is configured to implement a switching process for controlling a switching unit that switches the connection states of the plurality of above power storage units. In the above switching process, a first connection state and a third connection state are set. In the above first connection state, a part or all of the plurality of above power storage units are connected between the high-voltage power line and the high-voltage ground line. In the above third connection state, the power supply between the high-voltage ground line and the low-voltage ground line is cut off, and a part of the plurality of above power storage units is connected between the low-voltage power line and the low-voltage ground line.

[0010] With this structure, the power supply source can be flexibly changed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above objects, other objects, features, and advantages of the present disclosure can be made more apparent by referring to the drawings and the following detailed description. The drawings are as follows. Figure 1 It is a structural diagram of the power supply system of the first embodiment. Figure 2 It is a diagram showing the first series connection state of the power supply system. Figure 3 It is a diagram showing the first parallel connection state of the power supply system. Figure 4 It is a diagram showing the second connection state of the power supply system. Figure 5 It is a diagram showing the third connection state of the power supply system. Figure 6 It is a flowchart showing the switching process in normal times. Figure 7 It is a diagram showing the second connection state of the power supply system. Figure 8 It is a diagram showing the first series connection state of the power supply system. Figure 9 It is a diagram showing the first parallel connection state of the power supply system. Figure 10 It is a flowchart showing the equalization process during parking. Figure 11 It is a structural diagram of the power supply system of the second embodiment. Figure 12It is a diagram showing the first series connection state of the power supply system of the second embodiment. Figure 13 It is a diagram showing the first parallel connection state of the power supply system of the second embodiment. Figure 14 It is a diagram showing the second connection state of the power supply system of the second embodiment. Figure 15 It is a structural diagram of the power supply system of the third embodiment. Figure 16 It is a diagram showing the first connection state of the power supply system of the third embodiment. Figure 17 It is a diagram showing the second connection state of the power supply system of the third embodiment. Figure 18 It is a structural diagram of the power supply system of the fourth embodiment. Figure 19 It is a diagram showing the first connection state of the power supply system of the fourth embodiment. Figure 20 It is a diagram showing the second connection state of the power supply system of the fourth embodiment. Figure 21 It is a structural diagram of the power supply system of Modification 1. Figure 22 It is a flowchart showing the switch processing in case of abnormality in Modification 1. Figure 23 It is a diagram showing the third connection state of the power supply system of Modification 2. Figure 24 It is a diagram showing the second connection state of the power supply system of Modification 2. Figure 25 It is a flowchart showing the equalization processing in Modification 2. Figure 26 It is a flowchart showing the equalization processing in Modification 3. Figure 27 It is a diagram showing the power supply system of Modification 4. Figure 28 It is a diagram showing the power supply system of Modification 4. Figure 29 It is a flowchart showing the equalization processing in Modification 4. Figure 30 It is a structural diagram of the power supply system of Modification 5. Figure 31 It is a structural diagram of the power supply system of Modification 6. Figure 32 It is a structural diagram of the power supply system of Modification 7. Figure 33 It is a structural diagram of the power supply system of Modification 8. Figure 34 It is a structural diagram of a power supply system of other modified examples. Figure 35 It is a structural diagram of a power supply system of other modified examples. Figure 36 It is a structural diagram of a power supply system of other modified examples. Figure 37 It is a structural diagram of a power supply system of other modified examples. Figure 38 It is a structural diagram of a power supply system of other modified examples. Figure 39 It is a structural diagram of a power supply system of other modified examples. Figure 40 It is a structural diagram of a power supply system of other modified examples. Figure 41 It is a structural diagram of a power supply system of other modified examples. Figure 42 It is a structural diagram of a power supply system of other modified examples. Figure 43 It is a structural diagram of a power supply system of other modified examples. Figure 44 It is a structural diagram of a power supply system of other modified examples. Figure 45 It is a structural diagram of a power supply system of other modified examples. Figure 46 It is a structural diagram of a power supply system of other modified examples. Figure 47 It is a structural diagram of a power supply system of other modified examples. Figure 48 It is a structural diagram of a power supply system of other modified examples. Figure 49 It is a structural diagram of a power supply system of other modified examples. Figure 50 It is a structural diagram of a power supply system of other modified examples. Figure 51 It is a structural diagram of a power supply system of other modified examples. Figure 52 It is a structural diagram of a power supply system of other modified examples. Figure 53 It is a structural diagram of a power supply system of other modified examples. Figure 54 It is a structural diagram of a power supply system of other modified examples. Figure 55 It is a structural diagram of a power supply system of other modified examples. Figure 56 It is a structural diagram of a power supply system of other modified examples. Figure 57 It is a structural diagram of a power supply system of other modified examples. Detailed implementation modes

[0012] With reference to the accompanying drawings, a plurality of implementation modes and their modified examples will be described. In the plurality of implementation modes and their modified examples, parts and / or related parts that are functionally and / or structurally corresponding are sometimes marked with the same reference numerals or reference numerals with more than one hundred different digits. For the corresponding parts and / or related parts, the description of other implementation modes can be referred to.

[0013] (First implementation mode) Hereinafter, a first implementation mode in which the power supply system of the present disclosure is embodied will be described with reference to the accompanying drawings. The power supply system of this implementation mode is installed in a vehicle such as an electric vehicle or a hybrid vehicle and constitutes an in-vehicle system.

[0014] As Figure 1 shown, the in-vehicle system includes a motor 10, an inverter 20 (inverter circuit), a high-voltage power line H1, a high-voltage ground line L1, a low-voltage power line H2, a low-voltage ground line L2, a power supply system 30, and a DCDC converter 70 (voltage conversion device).

[0015] The motor 10 has a plurality of armature windings. In this implementation mode, the motor 10 is a three-phase synchronous machine and has armature windings 11 of U phase, V phase, and W phase with a star connection and a rotor (not shown). The armature windings 11 of each phase are arranged so as to be electrically angled 120° apart from each other. The motor 10 is, for example, a permanent magnet synchronous machine. The rotor can transmit power to the drive wheels of the vehicle. Therefore, the motor 10 is a source for generating the torque that drives the vehicle.

[0016] The inverter 20 includes a series connection body of upper-arm switches SWH and lower-arm switches SWL corresponding to three phases. An upper-arm diode DH as a freewheeling diode is reversely connected in parallel to the upper-arm switch SWH, and a lower-arm diode DL as a freewheeling diode is reversely connected in parallel to the lower-arm switch SWL. In this implementation mode, each switch SWH, SWL is an IGBT.

[0017] The inverter 20 has a smoothing capacitor 21. The high-potential side terminal of the smoothing capacitor 21 is connected to the high-voltage power line H1. The low-potential side terminal of the smoothing capacitor 21 is connected to the high-voltage ground line L1. In addition, the smoothing capacitor 21 can also be provided outside the inverter 20.

[0018] In each phase, the connection point between the emitter, which is the low-potential side terminal of the upper-arm switch SWH, and the collector, which is the high-potential side terminal of the lower-arm switch SWL, is connected to the first end of the armature winding 11 via a conductive member 23 such as a bus bar. The second ends of the armature windings 11 of each phase are connected to each other at the neutral point. In addition, in the present embodiment, the number of turns of the armature winding 11 of each phase is set to be the same. Thus, for example, the inductance of the armature winding 11 of each phase is set to be the same.

[0019] The collector of the upper-arm switch SWH of each phase is connected to the high-voltage power supply line H1. The emitter of the lower-arm switch SWL of each phase is connected to the high-voltage ground line L1. The high-voltage ground line L1 is connected to a frame grounding member FG such as a vehicle body. Therefore, the motor 10 is connected to the high-voltage power supply line H1 via the inverter 20. In addition, either or both of the motor 10 and the inverter 20 may be included in the power supply system 30 or may not be included in the power supply system 30.

[0020] Various high-voltage loads 71 (not shown) are connected between the high-voltage power supply line H1 and the high-voltage ground line L1. The high-voltage load 71 is an electrical load that requires a high voltage, such as an air compressor or the like. In addition, the motor 10 is also a type of high-voltage load 71.

[0021] Various low-voltage loads 72 are connected between the low-voltage power supply line H2 and the low-voltage ground line L2. The low-voltage load 72 is an electrical load that requires a low voltage (lower than the high-voltage load 71), such as various control devices such as an ECU or the like. The low-voltage ground line L2 is connected to a signal grounding member SG. The signal grounding member SG is insulated from the frame grounding member FG.

[0022] The DCDC converter 70 has a function of converting the voltage of the input power. The DCDC converter 70 is connected between the high-voltage power supply line H1 and the high-voltage ground line L1, can step down the voltage of the power input from the high-voltage power supply line H1 side, and supply it to the low-voltage load 72 or the like connected to the low-voltage power supply line H2 via the power transmission line L3. In addition, conversely, the DCDC converter 70 is configured to be able to step up the voltage of the power input from the low-voltage power supply line H2 side through the power transmission line L3 and supply it to the high-voltage load 71 connected to the high-voltage power supply line H1. In addition, the DCDC converter 70 is controlled by a control device 100 described later. The DCDC converter 70 may be included in the power supply system 30 or may not be included in the power supply system 30. In addition, in the first embodiment, the DCDC converter 70 may not have a boosting function.

[0023] Next, the power supply system 30 will be described. The power supply system 30 includes a first storage battery 31 (equivalent to the "first power storage unit"), a second storage battery 32 (equivalent to the "second power storage unit"), and a third storage battery 33 (equivalent to the "third power storage unit"). Each of the storage batteries 31, 32, and 33 serves as a power supply source for driving the rotation of the rotor of the motor 10. Each of the storage batteries 31, 32, and 33 is a battery pack formed as a series connection body of single cells, i.e., battery monomers. The battery monomer is, for example, a secondary battery such as a lithium-ion battery.

[0024] The first storage battery 31 has the highest output voltage among the storage batteries 31, 32, and 33, for example, an output voltage of 400V. In addition, compared with the first storage battery 31, the second storage battery 32 has a low output voltage, for example, an output voltage of 12V. The output voltage of the third storage battery 33 is arbitrary. In the present embodiment, for example, it is 200V. In addition, the voltage between the terminals of each of the storage batteries 31 to 33 can be arbitrarily changed.

[0025] The power supply system 30 includes a first A switch SW1a provided in a first A electrical path 1A connecting the positive terminal of the first storage battery 31 and the high-voltage power supply line H1. The energization and power-off in the first A electrical path 1A are switched by the first A switch SW1a.

[0026] In addition, a series connection body of a pre-charge switch Pre-P and a resistor body R1 may be connected in parallel with the first A switch SW1a. In addition, the first A switch SW1a is equivalent to the system main relay switch on the high-potential side.

[0027] The power supply system 30 includes a first B switch SW1b provided in a first B electrical path 1B connecting the negative terminal of the first storage battery 31 and the high-voltage ground line L1. The energization and power-off in the first B electrical path 1B are switched by the first B switch SW1b.

[0028] The power supply system 30 includes a second A switch SW2a provided in a second A electrical path 2A connecting the negative terminal of the first storage battery 31 and the positive terminal of a first series connection body 40 formed by the second storage battery 32 and the third storage battery 33. By the second A switch SW2a, the energization and power-off in the second A electrical path 2A, that is, the energization and power-off between the negative terminal of the first storage battery 31 and the positive terminal of the first series connection body 40, can be switched.

[0029] In addition, the first series connection body 40 is formed by serially connecting the positive terminal of the second battery 32 to the negative terminal of the third battery 33. Therefore, in the present embodiment, the positive terminal of the first series connection body 40 corresponds to the positive terminal of the third battery 33, and the negative terminal of the first series connection body 40 corresponds to the negative terminal of the second battery 32.

[0030] The power supply system 30 includes a second B switch SW2b provided in a second B electrical path 2B that connects the negative terminal of the first series connection body 40 to the high-voltage ground wire L1. By means of the second B switch SW2b, it is possible to switch the energization and power-off in the second B electrical path 2B, that is, the energization and power-off between the negative terminal of the first series connection body 40 and the high-voltage ground wire L1. In addition, the second B switch SW2b corresponds to the system main relay switch on the low-potential side.

[0031] The power supply system 30 includes a third A switch SW3a provided in a third A electrical path 3A that connects the positive terminal of the second battery 32 to the low-voltage power line H2. By means of the third A switch SW3a, it is possible to switch the energization and power-off of the third A electrical path 3A.

[0032] The power supply system 30 includes a third B switch SW3b provided in a third B electrical path 3B that connects the negative terminal of the second battery 32 to the low-voltage ground wire L2. By means of the third B switch SW3b, it is possible to switch the energization and power-off of the third B electrical path 3B.

[0033] The power supply system 30 includes a fourth switch SW4 provided in a bypass path 60 that connects the neutral point of the armature winding 11 of the motor 10 to the positive terminal of the first series connection body 40. By means of the fourth switch SW4, it is possible to switch the energization and power-off of the bypass path 60. In addition, a switch RN is provided on the neutral point side in the bypass path 60. When at least the fourth switch SW4 is turned on, this switch RN is also turned on. Furthermore, a capacitor C1 is provided between the bypass path 60 and the high-voltage ground wire L1.

[0034] In the present embodiment, each of the switches SW1a, SW1b, SW2a, SW2b, SW3a, SW3b, SW4 (hereinafter sometimes collectively referred to as each switch SW) is a mechanical relay. Each switch SW blocks the bidirectional current flow when it is turned off and allows the bidirectional current flow when it is turned on. In addition, each switch SW is not limited to a mechanical relay and may be, for example, a semiconductor switching element. These switches SW1a, SW1b, SW2a, SW2b, SW3a, SW3b, SW4 correspond to the switch unit.

[0035] In addition, the power supply system 30 has a control device 100. The control device 100 is mainly composed of a microcomputer 101, and the microcomputer 101 includes a CPU, a RAM, a ROM, etc. The functions provided by the microcomputer 101 can be provided by software recorded in a physical memory device and a computer that executes the software, software only, hardware only, or a combination thereof. For example, when the microcomputer 101 is provided by an electronic circuit as hardware, it can be provided by a digital circuit or an analog circuit including a plurality of logic circuits. For example, the microcomputer 101 executes a program stored in a non-transitory tangible storage medium that is included in itself as a storage unit. The program contains, for example, a program for the processing shown in Figure 6 etc. By executing the program, a method (processing) corresponding to the program is executed. The storage unit is, for example, a non-volatile memory. In addition, the program stored in the storage unit can be updated, for example, through a communication network such as the Internet by OTA (Over The Air).

[0036] Information (detection values) from various sensors is input to the control device 100. For example, among various sensors, although not shown, there are a voltage sensor that detects the voltage between the terminals of each of the storage batteries 31, 32, 33, a current sensor that detects the current flowing through each of the storage batteries 31, 32, 33, a rotation angle sensor that detects the rotation angle (electrical angle) of the rotor, and a phase current sensor that detects the phase current flowing through the armature windings 11 of each phase.

[0037] Based on information such as the detection values input from various sensors, the control device 100 performs various processes according to the program. Among the various processes performed, there is, for example, a process of controlling the inverter 20. Specifically, the control device 100 performs switching control of each switch SWH, SWL that constitutes the inverter 20 based on the detection values of the respective sensors, so as to feedback-control the control amount of the motor 10 to the command value. The control amount is, for example, torque. In each phase, the upper-arm switch SWH and the lower-arm switch SWL are alternately turned on. Through this feedback control, the rotational power of the rotor is transmitted to the drive wheels, and the vehicle travels. Therefore, the control device 100 has a function as an inverter control unit.

[0038] In addition, as described above, the control device 100 executes processing related to voltage conversion by controlling the DCDC converter 70. In addition, although it will be described in detail later, the control device 100 performs processing for detecting whether power supply from the low-voltage power supply unit 80 is normal. Therefore, the control device 100 has a function as an abnormality determination unit.

[0039] In addition, the control device 100 is configured to be able to control the on / off of each switch SW of the power supply system 30. Therefore, the control device 100 has a function as a switch control unit. Here, an explanation will be given on how the control device 100 controls the on / off states of the switches SW of the power supply system 30 in the present embodiment.

[0040] As Figure 2 and Figure 3 shown, the control device 100 is configured to be able to set a first connection state in which a part or all of a plurality of storage batteries (the first storage battery 31, the second storage battery 32, and the third storage battery 33) included in the power supply system 30 are connected only to the high-voltage power line H1. In the present embodiment, the control device 100 connects all the storage batteries 31 to 33 included in the power supply system 30 to the high-voltage power line H1 in the first connection state. In addition, in the first embodiment, the control device 100 is configured to be able to select and set either a first series connection state or a first parallel connection state as the first connection state.

[0041] The first series connection state in the first connection state indicates a state in which the second series connection body 50 formed by connecting the first storage battery 31, the third storage battery 33, and the second storage battery 32 in series is connected to the high-voltage power line H1. Specifically, as Figure 2 shown, the control device 100 sets the first series connection state (the first connection state) by disconnecting the first B switch SW1b, the third A switch SW3a, the third B switch SW3b, and the fourth switch SW4 and turning on the first A switch SW1a, the second A switch SW2a, and the second B switch SW2b.

[0042] In this first series connection state, the second series connection body 50 formed by connecting the first storage battery 31, the third storage battery 33, and the second storage battery 32 in series is connected between the high-voltage power line H1 and the high-voltage ground line L1. That is, as shown by the dash-dotted line, high-voltage (400V + 200V + 12V) power is supplied from the second series connection body 50 to the high-voltage load 71 via the high-voltage power line H1. In addition, as Figure 2 shown, power is not directly supplied from the second storage battery 32 to the low-voltage load 72 via the low-voltage power line H2.

[0043] In the first connection state, the first parallel connection state indicates a state in which the first storage battery 31 and the first series connection body 40 are connected in parallel to the high-voltage power line H1. Specifically, as Figure 3As shown, the control device 100 sets the first parallel connection state (first connection state) by disconnecting the second A switch SW2a, the third A switch SW3a, and the third B switch SW3b, and connecting the first A switch SW1a, the first B switch SW1b, the second B switch SW2b, and the fourth switch SW4. In this first parallel connection state, the first battery 31 is connected between the high-voltage power line H1 and the high-voltage ground line L1, and the first series connection body 40 is connected between the neutral point of the motor 10 and the high-voltage ground line L1. That is, the first battery 31 and the first series connection body 40 are connected in parallel with the high-voltage power line H1, and high-voltage power is supplied to the high-voltage load 71 from the first battery 31 and the first series connection body 40 via the high-voltage power line H1.

[0044] In addition, the voltage between the terminals of the first series connection body 40 (12V + 200V) formed by the second battery 32 and the third battery 33 is lower than the voltage between the terminals of the first battery 31 (400V). However, it is boosted by the motor 10 and the inverter 20 and supplied to the high-voltage power line H1. In addition, the boost control of the inverter 20 is implemented by the control device 100 controlling the respective switches SWH and SWL of the inverter 20.

[0045] In addition, as Figure 4 shown, the control device 100 is configured to be able to set a second connection state in which a part of the batteries (the second battery 32) included in the power supply system 30 is connected to the low-voltage power line H2, and a part or all of the remaining batteries (the first battery 31 in this embodiment) is connected to the high-voltage power line H1.

[0046] Specifically, as Figure 4 shown, the control device 100 can set the second connection state by disconnecting the second A switch SW2a, the second B switch SW2b, and the fourth switch SW4, and connecting the first A switch SW1a, the first B switch SW1b, the third A switch SW3a, and the third B switch SW3b. In this second connection state, the first battery 31 is connected between the high-voltage power line H1 and the high-voltage ground line L1, and the second battery 32 is connected between the low-voltage power line H2 and the low-voltage ground line L2. In addition, in the second connection state, the high-voltage ground line L1 and the low-voltage ground line L2 are insulated from each other. Thus, high-voltage power is supplied to the high-voltage load 71 from the first battery 31 via the high-voltage power line H1, and low-voltage power is supplied to the low-voltage load 72 from the second battery 32 via the low-voltage power line H2.

[0047] In addition, as Figure 5As shown, the control device 100 is configured to be able to set a third connection state in which only a part of the storage batteries (the second storage battery 32) included in the power supply system 30 is connected to the low-voltage power line H2.

[0048] Specifically, as Figure 5 shown, the control device 100 sets the third connection state by disconnecting the first A switch SW1a, the first B switch SW1b, the second A switch SW2a, the second B switch SW2b, and the fourth switch SW4 and closing the third A switch SW3a and the third B switch SW3b. In the third connection state, low-voltage power is supplied from the second storage battery 32 to the low-voltage load 72 via the low-voltage power line H2. In addition, as Figure 5 shown, power is not supplied from the first storage battery 31 or the like to the high-voltage load 71 via the high-voltage power line H1. In addition, the second connection state shown above Figure 4 is also a kind of the third connection state because the energization between the high-voltage ground wire L1 and the low-voltage ground wire L2 is cut off and a part (the second storage battery 32) of the plurality of storage batteries 31 to 33 is connected between the low-voltage power line H2 and the low-voltage ground wire L2. Hereinafter, for the sake of convenience of explanation, the state shown in Figure 5 is represented as the third connection state, which is distinguished from the second connection state shown in Figure 4 .

[0049] Next, the switching control (switching process) of the first connection state to the third connection state performed by the control device 100 will be described. First, the normal-time switching process in normal times will be described with reference to Figure 6 . This normal-time switching process is executed by the control device 100 at regular intervals.

[0050] As Figure 6 shown, when starting the normal-time switching process, the control device 100 determines whether the vehicle is parked, specifically, whether it is in the start-stop period with the ignition switch off (step S101). If the determination result is affirmative, the third connection state is set (step S102). In addition, if it is in the third connection state before the switching process is implemented, the setting of the third connection state is continued, and if it is not in the third connection state, it is switched to the third connection state.

[0051] As described above, the control device 100 sets the third connection state by disconnecting the first A switch SW1a, the first B switch SW1b, the second A switch SW2a, the second B switch SW2b, and the fourth switch SW4 and closing the third A switch SW3a and the third B switch SW3b. As Figure 5As shown, in the third connection state, low-voltage power is supplied from the second storage battery 32 to the low-voltage load 72 via the low-voltage power line H2.

[0052] Next, the control device 100 determines whether the power consumption of the low-voltage load 72 increases due to vehicle starting compared to the first power threshold (step S103). The first power threshold is set to an arbitrary value based on the power that can be output from the second storage battery 32. If the determination result is negative, the control device 100 ends the normal-time switch process.

[0053] On the other hand, if the determination result in step S103 is positive, the control device 100 sets the second connection state (step S104). That is, the second connection state is set by disconnecting the second A switch SW2a, the second B switch SW2b, and the fourth switch SW4, and connecting the first A switch SW1a, the first B switch SW1b, the third A switch SW3a, and the third B switch SW3b.

[0054] In this second connection state, while insulating between the high-voltage ground wire L1 and the low-voltage ground wire L2, the first storage battery 31 is connected between the high-voltage power line H1 and the high-voltage ground wire L1, and the second storage battery 32 is connected between the low-voltage power line H2 and the low-voltage ground wire L2. Thus, high-voltage power from the first storage battery 31 can be supplied to the DCDC converter 70 via the high-voltage power line H1. Additionally, at this time, low-voltage power is also supplied from the second storage battery 32 to the low-voltage load 72 via the low-voltage power line H2.

[0055] Then, the control device 100 operates the DCDC converter 70 to convert (step-down) the input voltage from the first storage battery 31 via the high-voltage power line H1 (step S105). Then, in this step S105, as Figure 7 shown, power is supplied from the DCDC converter 70 to the low-voltage load 72 via the power transmission line L3.

[0056] After that, the control device 100 sets the first connection state (step S106). At this time, either the first series connection state or the first parallel connection state can be selectively set. When setting the first series connection state, the control device 100 sets the first series connection state by disconnecting the first B switch SW1b, the third A switch SW3a, the third B switch SW3b, and the fourth switch SW4, and connecting the first A switch SW1a, the second A switch SW2a, and the second B switch SW2b. Thus, as Figure 8 shown, the second series connection body 50 is connected between the high-voltage power line H1 and the high-voltage ground wire L1.

[0057] On the other hand, when setting the first parallel connection state, the control device 100 sets the first parallel connection state by turning off the second A switch SW2a, the third A switch SW3a, and the third B switch SW3b, and turning on the first A switch SW1a, the first B switch SW1b, the second B switch SW2b, and the fourth switch SW4. In this first parallel connection state, as Figure 9 shown, the first storage battery 31 and the first series connection body 40 are connected in parallel with the high-voltage power supply line H1.

[0058] In addition, as Figure 8 and Figure 9 shown, when setting the first connection state, power is supplied from the storage batteries 31 to 33 connected to the high-voltage power supply line H1 to the DCDC converter 70, and the voltage of the supplied power is stepped down by the DCDC converter 70 and supplied to the low-voltage load 72. In addition, before the switching in step S106, it is possible to switch to the second connection state, and power from the first storage battery 31 is supplied via the DCDC converter 70. Therefore, it is possible to prevent the interruption of the power supply to the low-voltage load 72 due to the switching of the connection state. Then, the control device 100 ends the normal-time switch process.

[0059] On the other hand, when the determination result in step S101 is negative, that is, when it is not during the start-stop period, the control device 100 sets the first connection state (the first series connection state or the first parallel connection state) (step S111). Thus, as Figure 8 shown, a second series connection body 50 is connected between the high-voltage power supply line H1 and the high-voltage ground line L1. Or, as Figure 9 shown, the first storage battery 31 and the first series connection body 40 are connected in parallel with respect to the high-voltage power supply line H1. At this time, the DCDC converter 70 is operated, and the high-voltage power supplied from the first storage battery 31 to the third storage battery 33 is stepped down and supplied to the low-voltage load 72.

[0060] Then, the control device 100 determines whether the vehicle is stopped and the power consumption of the low-voltage load 72 is reduced to below the second power threshold (step S112). The second power threshold is an arbitrary value, but it may be the same value as the first power threshold. In addition, for example, the second power threshold may be set based on the power required for the flowing dark current for starting or maintaining the function. Thus, in the present embodiment, the control device 100 has a function as a power consumption monitoring unit. When the determination result is negative, the control device 100 ends the normal-time switch process.

[0061] On the other hand, when the determination result is affirmative, that is, when the power consumption of the low-voltage load 72 drops below the second power threshold, the control device 100 sets Figure 7 the second connection state shown (step S113). Thereby, high-voltage power is supplied from the first storage battery 31 to the DCDC converter 70 via the high-voltage power line H1, and low-voltage power is supplied from the second storage battery 32 to the low-voltage load 72 via the low-voltage power line H2.

[0062] Then, the control device 100 stops the DCDC converter 70 (step S114). After that, the control device 100 sets Figure 5 the third connection state shown (step S115). As Figure 5 shown, in the third connection state, low-voltage power is supplied from the second storage battery 32 to the low-voltage load 72 via the low-voltage power line H2. In addition, since power is supplied to the low-voltage load 72 through the process of step S113, even if the DCDC converter 70 is stopped in step S114, the power supply to the low-voltage load 72 will not be interrupted. Thereby, the power consumption caused by operating the DCDC converter 70 and the power loss accompanying voltage conversion can be suppressed. After that, the control device 100 ends the normal-time switching process.

[0063] In addition, as described above, if the power of the second storage battery 32 is supplied to the low-voltage load 72 during parking, the SOC (state of charge) of the second storage battery 32 may become smaller than that of the third storage battery 33. That is, a deviation in SOC occurs. Therefore, in the first embodiment, during parking, a parking-time equalization process for equalizing the SOCs of the storage batteries 31, 32, and 33 is performed. Hereinafter, based on Figure 10 it will be described the parking-time equalization process.

[0064] The parking-time equalization process is executed by the control device 100 at every prescribed period. When executing the parking-time equalization process, as Figure 10As shown, the control device 100 determines whether the vehicle is in a parked state, specifically, whether it is in the start-stop period with the ignition switch turned off (step S201). If the determination result is negative, the control device 100 ends the equalization process during parking. On the other hand, if the determination result in step S201 is positive, the control device 100 estimates the SOC (state of charge) of each of the storage batteries 31, 32, and 33, and determines whether equalization is necessary (step S202). The method for estimating the SOC is performed by a well-known method. Therefore, the control device 100 has the function of an estimation unit. In addition, in step S202, when the SOC of the second storage battery 32 is below the lower limit value or the SOC of the second storage battery 32 is smaller than the SOC of the third storage battery 33 by more than the equalization threshold value, it is positively determined that equalization is necessary.

[0065] If the determination result is negative, that is, if equalization is not necessary, the control device 100 sets the third connection state (step S211). In addition, if it was in the third connection state before this process is implemented, the setting of the third connection state continues, and if it was not in the third connection state, it is switched to the third connection state.

[0066] On the other hand, if the determination result in step S202 is positive, that is, if equalization is necessary, the control device 100 sets the second connection state (step S203). As Figure 4 shown, in this second connection state, high-voltage power can be supplied from the first storage battery 31 to the DCDC converter 70 via the high-voltage power line H1. In addition, in the second connection state, low-voltage power is also supplied from the second storage battery 32 to the low-voltage load 72 via the low-voltage power line H2.

[0067] Then, the control device 100 operates the DCDC converter 70 to convert the input voltage from the first storage battery 31 (step-down) (step S205). Then, in step S205, as Figure 7 shown, power is supplied from the DCDC converter 70 to the low-voltage load 72 via the power line L3, and power is also supplied to the second storage battery 32 for charging.

[0068] Similarly to step S202, the control device 100 estimates the SOC (state of charge) of each of the storage batteries 31, 32, and 33, and determines whether equalization is necessary (step S205). Additionally, in step S205, the determination is made in the same manner as in step S202, but the conditions can also be different. For example, the control device 100 may negatively determine that equalization is not necessary when the SOC of the second storage battery 32 is within the allowable range and the difference between the SOC of the second storage battery 32 and the third storage battery 33 is within the allowable range, and positively determine that it is necessary in other cases.

[0069] When the determination result is affirmative, the control device 100 performs the process of step S205 again after a specified time. On the other hand, when the determination result is negative, that is, when equalization is not necessary, the control device 100 sets the third connection state (step S206). Thereby, as Figure 5 shown, the first A switch SW1a and the first B switch SW1b are turned off, and the power supply from the first storage battery 31 to the second storage battery 32 is stopped. Additionally, low-voltage power is supplied from the second storage battery 32 to the low-voltage load 72. After that, the control device 100 stops the DCDC converter 70 (step S207), and ends the equalization process during vehicle stop.

[0070] Above, the effects of the first embodiment are described.

[0071] According to the above power supply system 30, it is possible to switch between the first connection state and the second connection state. In the first connection state, all the storage batteries 31 to 33 are connected between the high-voltage power line H1 and the high-voltage ground line L1. In the second connection state, the power conduction between the high-voltage ground line L1 and the low-voltage ground line L2 is cut off, the second storage battery 32 is connected between the low-voltage power line H2 and the low-voltage ground line L2, and the first storage battery 31 among the remaining storage batteries 32 and 33 is connected between the high-voltage power line H1 and the high-voltage ground line L1. Thereby, the power supply source can be flexibly changed.

[0072] Additionally, by setting the second connection state, it is possible to supply low-voltage power to the low-voltage load 72. Therefore, it is also possible not to provide the low-voltage power supply unit 80, and the number of components and man-hours, etc., can be reduced.

[0073] Furthermore, by continuing the third connection state, even if a deviation occurs in the SOC of the storage batteries 31 to 33, it is possible to equalize the SOC. At this time, it is possible to switch to the second connection state, step down the input voltage from the first storage battery 31, and charge the third storage battery 33. Therefore, it is also possible not to include structures such as a charger, and the structure can be simplified.

[0074] In addition, when switching from the third connection state to the first connection state, it is temporarily switched to the second connection state. In this second connection state, the DCDC converter 70 is operated, and power is supplied to the low-voltage load 72. After that, it is switched to the first connection state. Therefore, it is possible to prevent the interruption of the power supply to the low-voltage load 72 during the switching.

[0075] Similarly, when switching from the first connection state to the third connection state, it is temporarily switched to the second connection state. After power is supplied from the second battery 32 to the low-voltage load 72, it is switched to the third connection state, and then switched to the first connection state. Therefore, it is possible to prevent the interruption of the power supply to the low-voltage load 72 during the switching.

[0076] In addition, according to the above-described power supply system 30, as the first connection state, it is configured to be able to select a first series connection state in which a plurality of batteries 31 to 33 are connected in series with respect to the high-voltage power line H1 and a first parallel connection state in which a plurality of batteries 31 to 33 are connected in parallel with respect to the high-voltage power line H1. Therefore, it is possible to arbitrarily change the voltage between the high-voltage power line H1 and the high-voltage ground line L1 according to the situation. For example, it can be distinguished as follows: when connected to a low-voltage charger, the first parallel connection state is set, and when connected to a high-voltage charger, the first series connection state is set.

[0077] In addition, according to the above-described power supply system 30, it is possible to set a third connection state in which only the second battery 32 is connected between the low-voltage power line H2 and the low-voltage ground line L2. Thus, during parking, it is not necessary to step down the high-voltage power of the first battery 31 or the like by the DCDC converter 70 and supply it to the low-voltage load 72. As a result, it is possible to reduce the power consumption for operating the DCDC converter 70 and the conversion loss during voltage step-down.

[0078] (Second Embodiment) A power supply system 230 according to a second embodiment in which a part of the structure of the power supply system 30 in the first embodiment is changed will be described. As Figure 11 shown, in the power supply system 230 of the second embodiment, the first end of the bypass path 160 is connected between the first A switch SW1a and the positive terminal of the first battery 31 in the first A electrical path 1A, and the second end is connected to the positive terminal of the first series connection body 40. Alternatively, the first end of the bypass path 160 may be connected to the high-voltage power line H1, and the second end may be connected to the positive terminal of the first series connection body 40. The power supply system 230 includes a fourth switch SW4 in the bypass path 160.

[0079] In addition, different from the first embodiment, the inter-terminal voltage of the third battery 33 is 388V. That is, the inter-terminal voltages of the second battery 32 and the third battery 33 are set such that the inter-terminal voltage of the first series connection body 40 formed by the second battery 32 and the third battery 33 is substantially equal to the inter-terminal voltage of the first battery 31.

[0080] Here, an explanation will be given of how the control device 100 controls the on / off states of the respective switches SW of the power supply system 230 in the second embodiment.

[0081] The control device 100 of the second embodiment is configured to be able to set a first connection state in which a part or all of the plurality of batteries (the first battery 31, the second battery 32, and the third battery 33) included in the power supply system 230 are connected to the high-voltage power line H1. In the second embodiment, in the first connection state, all the batteries 31 to 33 included in the power supply system 30 are connected to the high-voltage power line H1. In the second embodiment, the control device 100 is configured to be able to select and set either the first series connection state or the first parallel connection state as the first connection state.

[0082] The first series connection state in the first connection state indicates a state in which the second series connection body 50 formed by connecting the first battery 31, the third battery 33, and the second battery 32 in series is connected to the high-voltage power line H1. Specifically, as Figure 12 shown, the control device 100 can set the first series connection state (the first connection state) by disconnecting the first B switch SW1b, the third A switch SW3a, the third B switch SW3b, and the fourth switch SW4 and turning on the first A switch SW1a, the second A switch SW2a, and the second B switch SW2b.

[0083] In this first series connection state, the second series connection body 50 formed by connecting the first battery 31, the third battery 33, and the second battery 32 in series is connected between the high-voltage power line H1 and the high-voltage ground line L1. That is, electric power of high voltage (400V + 388V + 12V) is supplied from the second series connection body 50 to the high-voltage load 71 via the high-voltage power line H1. On the other hand, electric power is not supplied from the second battery 32 to the low-voltage load 72 via the low-voltage power line H2. In addition, similar to Figure 8 the above, the voltage of the second series connection body 50 can be stepped down via the DCDC converter 70 and supplied to the low-voltage load 72.

[0084] The first parallel connection state in the first connection state indicates a state in which the first battery 31 and the first series connection body 40 are connected in parallel to the high-voltage power line H1. Specifically, as Figure 13As shown, the control device 100 can set the first parallel connection state (first connection state) by disconnecting the second A switch SW2a, the third A switch SW3a, and the third B switch SW3b, and connecting the first A switch SW1a, the first B switch SW1b, the second B switch SW2b, and the fourth switch SW4. In this first parallel connection state, a second series connection body 50 formed by connecting the first battery 31, the third battery 33, and the second battery 32 in series is connected in parallel between the high-voltage power line H1 and the high-voltage ground line L1. In addition, power is not supplied from the second battery 32 to the low-voltage load 72 via the low-voltage power line H2. In addition, as with Figure 9 Similarly, the voltage of the second series connection body 50 can be stepped down via the DCDC converter 70 and supplied to the low-voltage load 72.

[0085] In addition, the control device 100 is configured to be able to set a second connection state in which a part of the batteries (the second battery 32) included in the power supply system 30 is connected to the low-voltage power line H2, and a part or all of the remaining batteries (the first battery 31 in this embodiment) is connected to the high-voltage power line H1.

[0086] Specifically, as Figure 14 shown, the control device 100 can set the second connection state by disconnecting the second A switch SW2a, the second B switch SW2b, and the fourth switch SW4, and connecting the first A switch SW1a, the first B switch SW1b, the third A switch SW3a, and the third B switch SW3b. In this second connection state, the first battery 31 is connected between the high-voltage power line H1 and the high-voltage ground line L1, and the second battery 32 is connected between the low-voltage power line H2 and the low-voltage ground line L2. Thus, high-voltage power is supplied from the first battery 31 to the high-voltage load 71 via the high-voltage power line H1, and low-voltage power is supplied from the second battery 32 to the low-voltage load 72 via the low-voltage power line H2. In addition, in the second connection state, the high-voltage ground line L1 and the low-voltage ground line L2 are insulated. Incidentally, as with Figure 7 Similarly, the voltage of the first battery 31 can be stepped down via the DCDC converter 70 and supplied to the low-voltage load 72, or the second battery 32 can be charged.

[0087] In addition, the control device 100 is configured to be able to set a third connection state in which only a part of the batteries (the second battery 32) included in the power supply system 30 is connected to the low-voltage power line H2.

[0088] Specifically, the control device 100 can set the third connection state by disconnecting the first A switch SW1a, the first B switch SW1b, the second A switch SW2a, the second B switch SW2b, and the fourth switch SW4, and connecting the third A switch SW3a and the third B switch SW3b. In the third connection state, low-voltage power is supplied from the second storage battery 32 to the low-voltage load 72 via the low-voltage power line H2. In addition, power is not supplied from the first storage battery 31 or the like to the high-voltage load 71 via the high-voltage power line H1.

[0089] In addition, since the switch processing during normal times and the equalization processing during parking are the same as those in the first embodiment, the description thereof is omitted. Through the above, the power supply system 230 of the second embodiment has the same effect as that of the first embodiment.

[0090] (Third Embodiment) A power supply system 330 of a third embodiment in which a part of the structure of the power supply system 30 in the first embodiment is changed will be described. The power supply system 330 of the third embodiment is as Figure 15 shown, a first storage battery 31 and a first series connection body 40 composed of a second storage battery 32 and a third storage battery 33 are connected in parallel to the high-voltage power line H1. Hereinafter, reference will be made to Figure 15 for a detailed description.

[0091] Different from the first embodiment, the voltage between the terminals of the third storage battery 33 in the third embodiment is 388V. That is, the voltage between the terminals of the second storage battery 32 and the third storage battery 33 is set so that the voltage between the terminals of the first series connection body 40 composed of the second storage battery 32 and the third storage battery 33 is substantially equal to the voltage between the terminals of the first storage battery 31.

[0092] The power supply system 330 includes: a first A switch SW1a, the first A switch SW1a is provided in a first A electrical path 1A connecting the positive terminal of the first storage battery 31 and the high-voltage power line H1; and a first B switch SW1b, the first B switch SW1b is provided in a first B electrical path 1B connecting the negative terminal of the first storage battery 31 and the high-voltage ground line L1. In addition, a series connection body of a pre-charge switch Pre-P2 and a resistor body R2 is connected in parallel with the first A switch SW1a.

[0093] In addition, the power supply system 330 includes: a second A switch SW2a, the second A switch SW2a is provided in a second A electrical path 2A connecting the positive terminal of the first series connection body 40 and the high-voltage power line H1; and a second B switch SW2b, the second B switch SW2b is provided in a second B electrical path 2B connecting the negative terminal of the first series connection body 40 and the high-voltage ground line L1.

[0094] In addition, in the third embodiment, the connection is made in the order of the third storage battery 33 → the second storage battery 32 from the high-voltage power supply line H1 side. Therefore, in the third embodiment, the positive terminal of the first series connection body 40 corresponds to the positive terminal of the third storage battery 33, and the negative terminal of the first series connection body 40 corresponds to the negative terminal of the second storage battery 32. In addition, a series connection body of the pre-charge switch Pre-P3 and the resistor body R3 is connected in parallel with the second A switch SW2a.

[0095] In addition, the power supply system 330 includes: a third A switch SW3a provided in a third A electrical path 3A connecting the positive terminal of the second storage battery 32 and the low-voltage power supply line H2; and a third B switch SW3b provided in a third B electrical path 3B connecting the negative terminal of the second storage battery 32 and the low-voltage ground line L2.

[0096] Here, an explanation will be given of how the control device 100 controls the on / off states of the respective switches SW of the power supply system 330 in the third embodiment.

[0097] The control device 100 is configured to be able to set a first connection state in which a part or all of the plurality of storage batteries (the first storage battery 31, the second storage battery 32, and the third storage battery 33) included in the power supply system 330 are connected to the high-voltage power supply line H1.

[0098] The first connection state of the third embodiment indicates a state in which the first storage battery 31 and the first series connection body 40 are connected in parallel to the high-voltage power supply line H1. Specifically, as Figure 16 shown, the control device 100 can set the first connection state by turning off the third A switch SW3a and the third B switch SW3b and turning on the first A switch SW1a, the first B switch SW1b, the second A switch SW2a, and the second B switch SW2b. In addition, as Figure 16 indicated by the dotted line, in the first connection state, the high-voltage power can be stepped down by the DCDC converter 70 and supplied to the low-voltage load 72.

[0099] In addition, the control device 100 is configured to be able to set a second connection state in which a part of the storage batteries (the second storage battery 32) included in the storage batteries 31 to 33 of the power supply system 330 are connected to the low-voltage power supply line H2, and a part or all of the remaining storage batteries (the first storage battery 31 in this embodiment) are connected to the high-voltage power supply line H1.

[0100] Specifically, as Figure 17As shown, the control device 100 can set the second connection state by disconnecting the second A switch SW2a and the second B switch SW2b and connecting the first A switch SW1a, the first B switch SW1b, the third A switch SW3a, and the third B switch SW3b. In this second connection state, the high-voltage ground wire L1 is insulated from the low-voltage ground wire L2, the first battery 31 is connected between the high-voltage power line H1 and the high-voltage ground wire L1, and the second battery 32 is connected between the low-voltage power line H2 and the low-voltage ground wire L2. Thus, high-voltage power is supplied from the first battery 31 to the high-voltage load 71 via the high-voltage power line H1, and low-voltage power is supplied from the second battery 32 to the low-voltage load 72 via the low-voltage power line H2. Additionally, although not shown, even in the second connection state, the DCDC converter 70 can step down the high-voltage power supplied from the first battery 31 and supply it to the low-voltage load 72 or charge the second battery 32.

[0101] In addition, the control device 100 is configured to be able to set a third connection state in which only a part of the batteries (the second battery 32) included in the power supply system 330 is connected to the low-voltage power line H2.

[0102] Specifically, the control device 100 can set the third connection state by disconnecting the first A switch SW1a, the first B switch SW1b, the second A switch SW2a, and the second B switch SW2b and connecting the third A switch SW3a and the third B switch SW3b. In the third connection state, low-voltage power is supplied from the second battery 32 to the low-voltage load 72 via the low-voltage power line H2. Additionally, power is not supplied from the first battery 31 or the like to the high-voltage load 71 via the high-voltage power line H1.

[0103] In addition, since the switch processing during normal times and the equalization processing during parking are the same as those in the first embodiment, the description thereof is omitted. Through the above, the power supply system 330 of the third embodiment has the same effect as that of the first embodiment.

[0104] (Fourth Embodiment) A power supply system 430 of a fourth embodiment in which a part of the structure of the power supply system 30 in the first embodiment is changed will be described. As Figure 18 shown, the power supply system 430 of the fourth embodiment includes a first inverter 420a and a second inverter 420b. Hereinafter, a detailed description will be given with reference to Figure 18 .

[0105] The first inverter 420a, similar to the inverter 20 of the first embodiment, includes a series connection body of an upper-arm switch SWH and a lower-arm switch SWL corresponding to three phases. In addition, the first inverter 420a, similar to the inverter 20 of the first embodiment, includes a smoothing capacitor 21a. In addition, the smoothing capacitor 21a may also be provided outside the first inverter 420a.

[0106] Moreover, the first inverter 420a is connected to a first high-voltage power line H401 and a first high-voltage ground line L401. That is, the series connection bodies of the upper-arm switch SWH and the lower-arm switch SWL in each phase are respectively connected between the first high-voltage power line H401 and the first high-voltage ground line L401.

[0107] In each phase, the connection point of the emitter, which is the low-potential side terminal of the upper-arm switch SWH of the first inverter 420a, and the collector, which is the high-potential side terminal of the lower-arm switch SWL of the first inverter 420a, is connected to the first end of the armature winding 11 via a conductive member 23 such as a bus bar.

[0108] The second inverter 420b, similar to the inverter 20 of the first embodiment, includes a series connection body of an upper-arm switch SWH and a lower-arm switch SWL corresponding to three phases. In addition, the second inverter 420b, similar to the inverter 20 of the first embodiment, includes a smoothing capacitor 21b. In addition, the smoothing capacitor 21b may also be provided outside the second inverter 420b. Moreover, the second inverter 420b is connected to a second high-voltage power line H402 and a second high-voltage ground line L402. That is, in the second inverter 420b, the series connection bodies of the upper-arm switch SWH and the lower-arm switch SWL in each phase are respectively connected between the second high-voltage power line H402 and the second high-voltage ground line L402.

[0109] In each phase, the connection point of the emitter, which is the low-potential side terminal of the upper-arm switch SWH of the second inverter 420b, and the collector, which is the high-potential side terminal of the lower-arm switch SWL of the second inverter 420b, is connected to the second end of the armature winding 11 via a conductive member 23 such as a bus bar. In addition, the second high-voltage power line H402 and the second high-voltage ground line L402 are connected to the first high-voltage power line H401 and the first high-voltage ground line L401 via the armature winding 11 of the motor 10.

[0110] In addition, different from the first embodiment, the inter-terminal voltage of the third storage battery 33 in the fourth embodiment is 388V. That is, the inter-terminal voltages of the second storage battery 32 and the third storage battery 33 are set such that the inter-terminal voltage of the first series connection body 40 formed by the second storage battery 32 and the third storage battery 33 is substantially equal to the inter-terminal voltage of the first storage battery 31. In addition, in the fourth embodiment, the inter-terminal voltage of the first series connection body 40 may not be equal to the inter-terminal voltage of the first storage battery 31.

[0111] The power supply system 430 includes: a first A switch SW1a disposed in a first A electrical path 1A connecting the positive terminal of the first storage battery 31 and the first high-voltage power line H401; and a first B switch SW1b disposed in a first B electrical path 1B connecting the negative terminal of the first storage battery 31 and the first high-voltage ground line L401. Thus, the first inverter 420a transfers power to and from the first storage battery 31 via the first high-voltage power line H401 and the first high-voltage ground line L401. In addition, a series connection body of a pre-charge switch Pre-P2 and a resistor R2 is connected in parallel with the first A switch SW1a.

[0112] Furthermore, the power supply system 430 includes: a second A switch SW2a disposed in a second A electrical path 2A connecting the positive terminal of the first series connection body 40 and the second high-voltage power line H402; and a second B switch SW2b disposed in a second B electrical path 2B connecting the negative terminal of the first series connection body 40 and the second high-voltage ground line L402. In addition, a series connection body of a pre-charge switch Pre-P3 and a resistor R3 is connected in parallel with the second A switch SW2a.

[0113] In addition, similar to the first embodiment, the power supply system 430 includes: a third A switch SW3a disposed in a third A electrical path 3A connecting the positive terminal of the second storage battery 32 and the low-voltage power line H2; and a third B switch SW3b disposed in a third B electrical path 3B connecting the negative terminal of the second storage battery 32 and the low-voltage ground line L2.

[0114] Here, an explanation will be given of how the control device 100 controls the on / off states of the respective switches SW of the power supply system 430 in the fourth embodiment.

[0115] The control device 100 is configured to be able to set a first connection state in which a part or all of a plurality of storage batteries (the first storage battery 31, the second storage battery 32, and the third storage battery 33) included in the power supply system 430 are connected to the high-voltage power line H1 constituted by the first high-voltage power line H401 and the second high-voltage power line H402.

[0116] The first connection state of the fourth embodiment indicates a state in which the first storage battery 31 is connected to the first high-voltage power line H401 and the first series connection body 40 is connected to the second high-voltage power line H402. Specifically, as Figure 19 shown, the control device 100 can set the first connection state by disconnecting the third A switch SW3a and the third B switch SW3b and turning on the first A switch SW1a, the first B switch SW1b, the second A switch SW2a, and the second B switch SW2b. In the first connection state, the first storage battery 31 is connected between the first high-voltage power line H401 and the first high-voltage ground line L401, and the first series connection body 40 is connected between the second high-voltage power line H402 and the second high-voltage ground line L402. In addition, as Figure 19 shown by the dashed line, in the first connection state, through the DCDC converter 70, high-voltage power can be stepped down and supplied to the low-voltage load 72.

[0117] In addition, the control device 100 is configured to be able to set a second connection state in which a part of the storage batteries (the second storage battery 32) included in the power supply system 430 is connected to the low-voltage power line H2, and a part or all of the remaining storage batteries (the first storage battery 31 in this embodiment) is connected to the first high-voltage power line H401.

[0118] Specifically, as Figure 20 shown, the control device 100 can set the second connection state by disconnecting the second A switch SW2a and the second B switch SW2b and turning on the first A switch SW1a, the first B switch SW1b, the third A switch SW3a, and the third B switch SW3b. As a result, the first storage battery 31 is connected between the first high-voltage power line H401 and the first high-voltage ground line L401, and on the other hand, the second storage battery 32 is connected between the low-voltage power line H2 and the low-voltage ground line L2. In addition, although not shown, in the second connection state, through the DCDC converter 70, high-voltage power can be stepped down and supplied to the low-voltage load 72.

[0119] In addition, the control device 100 is configured to be able to set a third connection state in which a part of the storage batteries (the second storage battery 32) included in the power supply system 430 is only connected to the low-voltage power line H2.

[0120] Specifically, the control device 100 can set the third connection state by disconnecting the first A switch SW1a, the first B switch SW1b, the second A switch SW2a, and the second B switch SW2b, and connecting the third A switch SW3a and the third B switch SW3b. Thereby, the power supply between the first high-voltage power line H401 and the first battery 31 is cut off. On the other hand, the second battery 32 is connected between the low-voltage power line H2 and the low-voltage ground line L2. In addition, the power supply between the third battery 33 and the second high-voltage power line H402 is cut off.

[0121] In addition, since the normal-time switch processing and the parking-time equalization processing are the same as those in the first embodiment, the description thereof is omitted. Through the above, the power supply system 430 of the fourth embodiment has the same effect as that of the first embodiment.

[0122] (Modification example) A modification example (another example of the embodiment) in which a part of the structure of the above embodiment is changed will be described.

[0123] (Modification example 1) · The power supply systems 30, 230, 330, and 430 of the above embodiment may also include a low-voltage power supply unit 80 that supplies low-voltage power (for example, 12V power) to the low-voltage load 72 via the low-voltage power line H2. For example, as Figure 21 shown, the power supply system 30 of the first embodiment may also include a low-voltage power supply unit 80. The low-voltage power supply unit 80 is composed of, for example, a lead-acid battery and a switch, etc. In addition, the power supply from the low-voltage power supply unit 80 is controlled by the control device 100. In addition, both or either one of the DCDC converter 70 and the low-voltage power supply unit 80 may be included inside the power supply system 30, or may not be included inside the power supply system 30.

[0124] In the case of including the low-voltage power supply unit 80 in this way, during normal parking periods, etc., it is not necessary to supply low-voltage power from the third battery 33 to the low-voltage load 72. However, in the case where the low-voltage power supply unit 80 malfunctions, etc., a part of the batteries 31, 32, and 33 (the second battery 32) can be used as the low-voltage power supply during abnormalities. That is, the power supply systems 30, 230, 330, and 430 can be made redundant.

[0125] Hereinafter, according to Figure 22 , the abnormal-time switch processing for switching the connection state during abnormalities will be described. In addition, in this modification example, it is premised that the first connection state is set at the time of vehicle start, power is supplied from the first battery 31 to the third battery 33 to the high-voltage load 71 such as the motor 10, and power is supplied from the low-voltage power supply unit 80 or the DCDC converter 70 to the low-voltage load 72.

[0126] Figure 22 The abnormal situation switch process shown is implemented by the control device 100 at every prescribed cycle. When starting the abnormal situation switch process, it is determined whether the vehicle is in the starting state, specifically, whether the ignition switch is turned on (step S301). If the determination result is negative, the abnormal situation switch process ends.

[0127] On the other hand, if the determination result in step S301 is positive, the control device 100 sets the first connection state (step S302). Additionally, if it is in the first connection state before the process of step S302, the setting of the first connection state continues; if not, it switches to the first connection state. In this first connection state, high-voltage electric power is supplied from the second series-connected body 50 to the high-voltage load 71 via the high-voltage power line H1. On the other hand, electric power is not supplied from the second battery 32 to the low-voltage load 72 via the low-voltage power line H2, but is supplied from the low-voltage power supply unit 80 to the low-voltage load 72.

[0128] Then, the control device 100 determines whether an abnormality has occurred in the power supply from the low-voltage power supply unit 80 to the low-voltage load 72 (step S303). Specifically, the control device 100 detects the current amount, voltage, temperature of the low-voltage power supply unit 80, etc. from the detection values of various sensors, and determines whether an abnormality has occurred based on these values. Through the process of step S303, the control device 100 functions as an abnormality determination unit.

[0129] If the determination result is negative, that is, if no abnormality has occurred, the control device 100 ends the abnormal situation switch process. On the other hand, if the determination result in step S303 is positive, the control device 100 controls each high-voltage load 71 to limit the power consumption of the high-voltage load 71 (step S304). For example, the inverter 20 is controlled to reduce the output torque of the motor 10. Through the process of step S304, the control device 100 functions as a load control unit.

[0130] Next, the control device 100 sets the third connection state (step S305). Thereby, low-voltage electric power from the second battery 32 is supplied to the low-voltage load 72 via the low-voltage power line H2. Additionally, although electric power is not supplied from the first battery 31, etc. to the high-voltage load 71 via the high-voltage power line H1, electric power can be supplied from the smoothing capacitor 21 for a certain period of time.

[0131] Next, the control device 100 controls the inverter 20 to adjust the voltage of the smoothing capacitor 21 (step S306). In this step S306, the voltage between the terminals of the smoothing capacitor 21 is adjusted to be equal to the voltage between the terminals of the first storage battery 31. Through the voltage adjustment in this step S306, it is possible to prevent the voltage of the smoothing capacitor 21 from being higher than the voltage of the first storage battery 31 when switching to the second connection state. Through the processing in this step S306, the control device 100 functions as an inverter control unit.

[0132] After the adjustment in step S306, the control device 100 switches to the second connection state (step S307). In this second connection state, high-voltage power is supplied from the first storage battery 31 to the high-voltage load 71 via the high-voltage power line H1, and low-voltage power is supplied from the second storage battery 32 to the low-voltage load 72 via the low-voltage power line H2. Therefore, the vehicle can be driven in a retreating manner for a certain period of time. Then, the control device 100 ends the abnormal-time switching process.

[0133] Next, the switching process when an abnormality occurs in the low-voltage power supply unit 80 when the vehicle is stopped will be described. When the vehicle is stopped, power is not supplied from the first storage battery 31 to the third storage battery 33, but power is supplied from the low-voltage power supply unit 80 to the low-voltage load 72. Therefore, when it is determined that the power supply from the low-voltage power supply unit 80 to the low-voltage load 72 is abnormal when the vehicle is stopped, the control device 100 sets the third connection state, and low-voltage power from the second storage battery 32 is supplied to the low-voltage load 72 via the low-voltage power line H2. In addition, when the vehicle is stopped, since there is no need to drive in a retreating manner, it is also possible not to set the third connection state.

[0134] (Modification Example 2) · Each of the power supply systems 30, 230, 330, 430 in the above-described embodiments may also be connected to a charging device for charging the second storage battery 32 when the vehicle is stopped. For example, as Figure 23 shown, the power supply system 30 may also be connected to the charging device 500. The charging device 500 may be an external charging device or a solar power generation device installed on the vehicle. This charging device 500 is connected to the second storage battery 32 via the low-voltage power line H2 and the third A electrical path 3A, etc., and charges the second storage battery 32. At this time, the power supply system 30 is set to the third connection state.

[0135] In addition, as Figure 23 shown, if only the second storage battery 32 is charged, a difference may occur in the SOC between the second storage battery 32 and the third storage battery 33. Therefore, in order to equalize the SOC, in this modification example, the equalization process shown in Figure 25 is implemented.Figure 25 The equalization process shown is implemented by the control device 100 at regular intervals while the vehicle is stopped and being charged.

[0136] At the start Figure 25 When the equalization process shown is started, the control device 100 estimates the SOC (state of charge) of each of the storage batteries 31, 32, and 33, and determines whether equalization is necessary (step S401). The method for estimating the SOC is performed by a well-known method. Further, in step S401, the control device 100 makes an affirmative determination that equalization is necessary when the SOC of the second storage battery 32 is at or above the upper limit value or when the SOC of the second storage battery 32 is greater than the SOC of the third storage battery 33 by more than the equalization threshold value.

[0137] When the determination result is negative, the control device 100 sets the third control state (step S402). Further, when in the third connection state before this process is implemented, the setting of the third connection state is continued, and when not in the third connection state, it can be switched to the third connection state. Thus, as Figure 23 shown, power is supplied from the charging device 500 to the second storage battery 32 and charging is performed. Then, the control device 100 ends Figure 25 the equalization process shown.

[0138] On the other hand, when the determination result in step S401 is affirmative, the control device 100 sets the second connection state (step S403). After that, as Figure 24 shown, the control device 100 operates the DCDC converter 70 to convert (boost) the voltage of the power input from the second storage battery 32 via the power transmission line L3 (step S404). Then, the power boosted by the DCDC converter 70 is supplied to the high-voltage load 71, the first storage battery 31, etc. via the high-voltage power supply line H1, and the second storage battery 32 is discharged.

[0139] After that, the control device 100 estimates the SOC (state of charge) of each of the storage batteries 31, 32, and 33 in the same manner as in step S401, and determines whether equalization is necessary (step S405). Further, in step S405, the determination is made in the same manner as in step S401, but the conditions can also be different. For example, the control device 100 may make a negative determination that equalization is not necessary when the SOC of the second storage battery 32 is within the allowable range and the difference in the SOC between the second storage battery 32 and the third storage battery 33 is within the allowable range, and make an affirmative determination that it is necessary in other cases. When the determination result is affirmative, the control device 100 executes the process of step S405 again after a specified time has elapsed.

[0140] On the other hand, in the case where the determination result is negative, that is, when there is no need for equalization, the control device 100 sets the third connection state (step S406). Thus, as Figure 23 shown, the first A switch SW1a and the first B switch SW1b are turned off, and the discharge of the second battery 32 stops. After that, the control device 100 stops the DCDC converter 70 (step S407) and ends Figure 25 the equalization process shown. Thus, the SOC of the second battery 32 and the SOC of the third battery 33 can be equalized. In addition, when discharging the second battery 32, since it is supplied to the high-voltage load 71 or the first battery 31, etc., it can be discharged efficiently and power waste can be suppressed. In addition, the structure for discharging can be reduced.

[0141] (Modification Example 3) · In the above-described embodiment, regardless of the presence or absence of the low-voltage power supply unit 80, the second connection state can be set at the time of vehicle start-up or the like. That is, at the time of vehicle start-up, high-voltage power from the first battery 31 can also be supplied to the high-voltage load 71 via the high-voltage power line H1, and low-voltage power from the second battery 32 can be supplied to the low-voltage load 72 via the low-voltage power line H2.

[0142] However, if this modification example is adopted and the second connection state is continuously set, a deviation may occur in the SOC of the batteries 31, 32, and 33. Therefore, the Figure 26 equalization process shown is performed to equalize the SOC of the batteries 31, 32, and 33. Figure 26 The equalization process shown is performed at a predetermined cycle in the second connection state.

[0143] At the start of the Figure 26 equalization process shown, the control device 100 determines whether it is in the second connection state (step S501). In the case where the determination result is negative, the control device 100 ends Figure 26 the equalization process shown.

[0144] On the other hand, in the case where the determination result is positive, the control device 100 estimates the SOC (state of charge) of each of the batteries 31, 32, and 33 and determines whether equalization is necessary (step S502). The method for estimating the SOC is performed by a well-known method. In addition, in step S502, the control device 100 positively determines that equalization is necessary when the SOC of the second battery 32 is below the lower limit value. In addition, the control device 100 positively determines that equalization is necessary when any one of the SOC differences of the batteries 31, 32, and 33 is equal to or greater than the equalization threshold.

[0145] When the determination result in step S502 is negative, the control device 100 ends Figure 26 the equalization process shown. On the other hand, when the determination result in step S502 is positive, the control device 100 operates the DCDC converter 70 to step down the high-voltage power of the first storage battery 31 and charges the second storage battery 32 (step S503). Alternatively, control is performed in such a manner that the charge amount of the second storage battery 32 increases or the supply power of the DCDC converter 70 increases.

[0146] After a predetermined time has elapsed, the control device 100 determines whether equalization is necessary in the same manner as in step S502 (step S504). In addition, in step S504, the determination is made in the same manner as in step S502, but the conditions may also be different. For example, the control device 100 may negatively determine that equalization is not necessary when the SOC of the second storage battery 32 is within the allowable range and the difference in each SOC is within the allowable range, and positively determine that it is necessary in other cases. When this determination result is positive, after a predetermined time has elapsed, the control device 100 again executes step S504. On the other hand, when this determination result is negative, the control device 100 stops the DCDC converter 70 or reduces the supply power of the DCDC converter 70 to decrease the charge amount of the second storage battery 32 (step S505). Then, the control device 100 ends Figure 26 the equalization process shown. Thereby, even if the second connection state is continuously set, the storage batteries 31, 32, and 33 can be equalized.

[0147] (Modification Example 4) · In each of the power supply systems 30, 230, 330, and 430 in the above-described embodiments, the second control state may be set when connected to the charging device for charging the second storage battery 32. For example, as Figure 27 shown, the second control state may be set when the power supply system 30 of the first embodiment is connected to the above-described charging device 500. Thereby, while charging the second storage battery 32 by the charging device 500, power can be supplied from the first storage battery 31 to the high-voltage load 71.

[0148] As described above, when charging the second storage battery 32 in the second connection state, a deviation may occur in the SOC of the storage batteries 31, 32, and 33. Therefore, the Figure 29 equalization process shown is performed to equalize the SOC of the storage batteries 31, 32, and 33. Figure 29 The equalization process shown is performed at every predetermined cycle when the second storage battery 32 is charged by the charging device 500 and when the second connection state is set.

[0149] At the start Figure 29 of the equalization process shown, the control device 100 determines whether the second battery 32 is being charged by the charging device 500 and whether it is in the second connection state (step S601). If the determination result is negative, the control device 100 ends Figure 29 the equalization process shown.

[0150] On the other hand, if the determination result is positive, the control device 100 estimates the SOC (state of charge) of each of the batteries 31, 32, 33 and determines whether equalization is necessary (step S602). The method of estimating the SOC is performed by a well-known method. Also, in step S602, the control device 100 positively determines that equalization is necessary when the SOC of the second battery 32 is at or above the upper limit value. In addition, the control device 100 positively determines that equalization is necessary when any one of the SOC differences among the batteries 31, 32, 33 is at or above the equalization threshold value. If the determination result is negative, the control device 100 ends Figure 29 the equalization process shown.

[0151] On the other hand, if the determination result in step S602 is positive, the control device 100 operates the DCDC converter 70 to Figure 28 as shown, boost the power from the second battery 32 by the DCDC converter 70 and supply it to the high-voltage load 71 etc., and discharge the second battery 32 (step S602). Or, when the DCDC converter 70 is in operation, control is performed so that the power input to the DCDC converter 70 increases and the discharge amount of the second battery 32 increases.

[0152] After a predetermined time has elapsed, the control device 100 determines whether equalization is necessary in the same manner as in step S602 (step S604). Also, in step S604, the same determination as in step S602 is made, but the conditions can also be different. For example, the control device 100 may negatively determine that equalization is not necessary when the SOC of the second battery 32 is within the allowable range and the SOC differences are within the allowable range, and positively determine that it is necessary in other cases. If the determination result is positive, after a predetermined time has elapsed, the control device 100 performs step S604 again. On the other hand, if the determination result is negative, the control device 100 stops the DCDC converter 70 or reduces the power input to the DCDC converter 70 to reduce the discharge amount of the second battery 32 (step S605). Then, the control device 100 ends Figure 29The equalization process shown. Thus, during the charging of the second battery 32, even if the second connection state is continuously set, the SOCs of the batteries 31, 32, and 33 can be equalized.

[0153] (Modification Example 5) · In each of the power supply systems 30, 230, 330, and 430 of the above-described embodiments, a switch for switching between energization and power-off between the second battery 32 and the third battery 33 may be provided. For example, as Figure 30 shown, in the power supply system 30 of the first embodiment, a switch SW5 for switching between energization and power-off between the positive terminal of the second battery 32 and the negative terminal of the third battery 33 may be provided. This switch SW5 also serves as a second A switch for switching between energization and power-off of the second A electrical path 2A.

[0154] (Modification Example 6) · In each of the power supply systems 30, 230, 330, and 430 of the above-described embodiments, the arrangements of the second battery 32 and the third battery 33 may be changed. For example, as Figure 31 shown, in the power supply system 30 of the first embodiment, they may be arranged in series in the order of the first battery 31 → the second battery 32 → the third battery 33 from the high-voltage power line H1 side. In this case, a switch SW5 for switching between energization and power-off between the negative terminal of the second battery 32 and the positive terminal of the third battery 33 may be provided.

[0155] (Modification Example 7) · In each of the power supply systems 30 and 230 of the above-described embodiments, the arrangements of the first battery 31, the second battery 32, and the third battery 33 may be changed. For example, as Figure 32 shown, in the power supply system 30 of the first embodiment, they are arranged in the order of the second battery 32 → the third battery 33 → the first battery 31 from the high-voltage power line H1 side. At this time, the bypass path 60 becomes a path connecting the negative terminal of the first series connection body 40 (the negative terminal of the third battery 33) and the neutral point of the motor 10. In addition, a series connection body of the pre-charge switch Pre-G and the resistor body R1 is connected in parallel with the first B switch SW1b.

[0156] (Modification Example 8) · In each of the power supply systems 30, 230, 330, and 430 of the above-described embodiments, the third battery 33 may be omitted. For example, as Figure 33As shown, the third storage battery 33 of the power supply system 30 in the first embodiment can also be omitted. In addition, in each of the power supply systems 230 and 330, when the third storage battery 33 is omitted, it is necessary to make the inter-terminal voltage of the third storage battery 33 substantially equal to the inter-terminal voltage of the first storage battery 31.

[0157] (Other modification examples) · In the above-described embodiment or modification example, the series connection bodies of the pre-charge switch and the resistor body can also be respectively connected in parallel on both sides of the switch on the high-voltage power line side and the switch on the high-voltage ground line side.

[0158] · In the above-described embodiment or modification example, when determining the necessity of equalization, the SOC of the storage batteries 31 to 33 is used to grasp the state of charge, but it is also possible to make a determination using factors other than the SOC. For example, as the state of charge, it is also possible to detect or estimate the remaining capacity or voltage and determine the necessity of equalization.

[0159] · As Figures 34 - 57 shown, the circuit structure of the power supply system 30 of the above-described first embodiment can also be arbitrarily changed.

[0160] · In the above-described embodiment or modification example, when determining whether an abnormality has occurred in the power supply from the low-voltage power supply unit 80 to the low-voltage load 72 (step S303, etc.), if any one of a failure of the low-voltage power supply unit 80, a failure of the DCDC converter 70, a ground fault of the power transmission line L3 or the low-voltage power line H2, and a failure of the storage unit that supplies power to the DCDC converter 70 is detected, it can also be determined that an abnormality has occurred.

[0161] · In the above-described fourth embodiment, when switching from the first connection state to the second connection state, it is also possible to operate only the first inverter 420a. Thereby, when the power supply between the second storage battery 32 and the third storage battery 33 and the second inverter 420b is cut off, a failure of the switch can be prevented. In addition, torque fluctuations accompanying the cut-off can be suppressed.

[0162] · In the above-described embodiment or modification example, as each switch SW, it is not limited to being composed of one switch, and it can also be composed of a series connection body of a plurality of switches or a parallel connection body of a plurality of switches.

[0163] · In the above-described embodiment or modification example, as the switches of the inverters 20, 420a, and 420b, it is not limited to IGBTs, and for example, it can also be an N-channel MOSFET including a body diode.

[0164] · In the above-described embodiments or modifications, as the electric motor, it is not limited to the star connection, and the delta connection may also be used. Further, as the electric motor and the inverter, they are not limited to three-phase, and may be two-phase or four-phase or more. Further, as the electric motor, it is not limited to the permanent magnet type synchronous machine having a permanent magnet as the excitation pole in the rotor, and may also be a wound field type synchronous machine having an excitation winding as the excitation pole in the rotor. In this case, both an excitation winding and a permanent magnet may be provided in the rotor. Further, as the electric motor, it is not limited to the synchronous machine, and may also be an induction machine.

[0165] · In the above-described embodiments or modifications, as the power storage unit, it is not limited to the storage battery, and for example, it may also include a large-capacity electric double layer capacitor, or both the storage battery and the electric double layer capacitor.

[0166] · In the above-described embodiments or modifications, the third storage battery 33 is used excessively compared with other storage batteries, for example, the third storage battery 33. Therefore, the third storage battery 33 may also be a storage battery having excellent durability, safety, capacity, etc. compared with other storage batteries.

[0167] · In the above-described embodiments or modifications, as the moving body equipped with the power supply system, it is not limited to the vehicle, and for example, it may also be an aircraft or a ship. Further, the installation location of the power conversion device is not limited to the moving body, and may also be a stationary device.

[0168] · The control unit and the method thereof described in the present disclosure may also be implemented by a dedicated computer provided by configuring a processor and a memory, and the above processor is programmed to execute one or more functions embodied by a computer program. Alternatively, the control unit described in the present disclosure and the method of the control unit may be implemented by a dedicated computer provided by configuring a processor from one or more dedicated hardware logic circuits. Alternatively, the control unit described in the present disclosure and the method of the control unit may be implemented by one or more dedicated computers, and the dedicated computer is configured by a combination of a processor programmed to execute one or more functions and a memory and a processor configured from one or more hardware logic circuits. Further, the computer program may also be stored in a computer-readable non-transitory tangible recording medium as an instruction executed by the computer.

[0169] Hereinafter, the characteristic structures extracted from the above-described embodiments will be described. [Structure 1] A power supply system, the above power supply system (30, 230, 330, 430) is connected to a high-voltage type power line (H1) connected to a high-voltage load (71) and a low-voltage type power line (H2) connected to a low-voltage load (72), and includes a plurality of power storage units (31 to 33), The above power supply system includes: A switch unit (SW) that switches the connection states of a plurality of power storage units; and A switch control unit (100) that controls the switch unit, wherein the switch control unit sets a first connection state and a third connection state, in the first connection state, some or all of the plurality of power storage units are connected between a high-voltage power line and a high-voltage ground wire (L1); in the third connection state, the energization between the high-voltage ground wire and a low-voltage ground wire (L2) is cut off, and some of the plurality of power storage units are connected between the low-voltage power line and the low-voltage ground wire. [Structure 2] The power supply system according to Structure 1, wherein the switch control unit is configured to be able to select, as the first connection state, a first series connection state in which a plurality of the power storage units are connected in series with respect to the high-voltage power line and a first parallel connection state in which a plurality of the power storage units are connected in parallel with respect to the high-voltage power line. [Structure 3] The power supply system according to Structure 1 or 2, wherein the switch control unit controls the switch unit to set a second connection state in which the energization between the high-voltage ground wire and the low-voltage ground wire (L2) is cut off, some of the plurality of power storage units are connected between the low-voltage power line and the low-voltage ground wire, and some or all of the remaining power storage units are connected between the high-voltage power line and the high-voltage ground wire. [Structure 4] The power supply system according to Structure 3, wherein the power storage unit includes a first power storage unit (31), a second power storage unit (32) having a lower voltage than the first power storage unit, and a third power storage unit (33) connected in series with the second power storage unit, the switch unit includes: a first A switch (SW1a) provided in a first A electrical path (1A) connecting the positive terminal of the first power storage unit and the high-voltage power line; a first B switch (SW1b) provided in a first B electrical path (1B) connecting the negative terminal of the first power storage unit and the high-voltage ground wire; The second A switch (SW2a, SW5), the second A switch switches the energization and de-energization of a second A electrical path (2A) connected between the positive terminal of a first series connection body (40) formed by connecting the second power storage unit and the third power storage unit in series and the negative terminal of the first power storage unit; The second B switch (SW2b), the second B switch is provided in a second B electrical path (2B) connected between the negative terminal of the first series connection body and the high-voltage grounding wire; The third A switch (SW3a), the third A switch is provided in a third A electrical path (3A) connected between the positive terminal of the second power storage unit and the low-voltage power supply line; and The third B switch (SW3b), the third B switch is provided in a third B electrical path (3B) connected between the negative terminal of the second power storage unit and the low-voltage grounding wire, The switch control unit sets a first connection state by disconnecting the first B switch, the third A switch, and the third B switch and turning on the first A switch, the second A switch, and the second B switch, The second connection state is set by disconnecting the second A switch and the second B switch and turning on the first A switch, the first B switch, the third A switch, and the third B switch. [Structure 5] The power supply system as described in Structure 4, wherein, The power supply system is connected to an inverter (20) via the high-voltage power supply line and the high-voltage grounding wire, and the inverter is connected to a motor (10), The switch unit includes a fourth switch (SW4) provided in a bypass path (60) connected between the neutral point of the armature winding of the motor and the positive terminal of the first series connection body, The switch control unit is configured to be able to select, as the first connection state, a first series connection state in which a plurality of the power storage units are connected in series with respect to the high-voltage power supply line and a first parallel connection state in which a plurality of the power storage units are connected in parallel with respect to the high-voltage power supply line, The switch control unit sets the first series connection state by disconnecting the first B switch, the third A switch, the third B switch, and the fourth switch and turning on the first A switch, the second A switch, and the second B switch. On the other hand, The first parallel connection state is set by disconnecting the second A switch, the third A switch, and the third B switch and turning on the first A switch, the first B switch, the second B switch, and the fourth switch. [Structure 6] The power supply system described in Structure 4, wherein, The above-mentioned switch section includes a fourth switch (SW4) provided in a bypass path (160) connecting the positive terminal of the above-mentioned first series-connected body and the above-mentioned high-voltage power line. The above-mentioned switch control section is configured to be able to select, as the above-mentioned first connection state, a first series connection state in which a plurality of the above-mentioned power storage sections are connected in series with respect to the above-mentioned high-voltage power line and a first parallel connection state in which a plurality of the above-mentioned power storage sections are connected in parallel with respect to the above-mentioned high-voltage power line. The above-mentioned switch control section sets the above-mentioned first series connection state by disconnecting the above-mentioned first B switch, the above-mentioned third A switch, the above-mentioned third B switch, and the above-mentioned fourth switch and turning on the above-mentioned first A switch, the above-mentioned second A switch, and the above-mentioned second B switch. On the other hand, The first parallel connection state is set by disconnecting the above-mentioned second A switch, the above-mentioned third A switch, and the above-mentioned third B switch and turning on the above-mentioned first A switch, the above-mentioned first B switch, the above-mentioned second B switch, and the above-mentioned fourth switch. [Structure 7] The power supply system described in Structure 3, wherein, The above-mentioned power storage section includes a first power storage section (31), a second power storage section (32) having a lower voltage than the above-mentioned first power storage section, and a third power storage section (33) connected in series with the above-mentioned second power storage section. The above-mentioned switch section includes: A first A switch (SW1a), the first A switch being provided in a first A electrical path (1A) connecting the positive terminal of the above-mentioned first power storage section and the above-mentioned high-voltage power line; A first B switch (SW1b), the first B switch being provided in a first B electrical path (1B) connecting the negative terminal of the above-mentioned first power storage section and the above-mentioned high-voltage ground line; A second A switch (SW2a, SW5), the second A switch switching the energization and power-off of a second A electrical path (2A) connecting the positive terminal of a first series-connected body (40) formed by connecting the above-mentioned second power storage section and the above-mentioned third power storage section in series and the above-mentioned high-voltage power line; A second B switch (SW2b), the second B switch being provided in a second B electrical path (2B) connecting the negative terminal of the above-mentioned first series-connected body and the positive terminal of the above-mentioned first power storage section; A third A switch (SW3a), the third A switch being provided in a third A electrical path (3A) connecting the positive terminal of the above-mentioned second power storage section and the above-mentioned low-voltage power line; and A third B switch (SW3b), said third B switch being provided in a third B electrical path (3B) connecting the negative terminal of said second power storage unit to said low-voltage ground wire, The switch control unit sets the first connection state by disconnecting the first A switch, the third A switch, and the third B switch, and turning on the first B switch, the second A switch, and the second B switch. The second connection state is set by disconnecting the second A switch and the second B switch, and turning on the first A switch, the first B switch, the third A switch, and the third B switch. [Structure 8] A power supply system as described in Structure 7, wherein The power supply system is connected to an inverter (20) via the high-voltage power line and the high-voltage ground wire, and the inverter is connected to a motor (10). The switch unit includes a fourth switch (SW4) provided in a bypass path (60) connecting the neutral point of the armature winding of the motor to the negative terminal of the first series connection body. The switch control unit is configured to be able to select, as the first connection state, a first series connection state in which a plurality of said power storage units are connected in series with respect to the high-voltage power line and a first parallel connection state in which a plurality of said power storage units are connected in parallel with respect to the high-voltage power line. The switch control unit sets the first series connection state by disconnecting the first A switch, the third A switch, the third B switch, and the fourth switch, and turning on the first B switch, the second A switch, and the second B switch. On the other hand, The first parallel connection state is set by disconnecting the second B switch, the third A switch, and the third B switch, and turning on the first A switch, the first B switch, the second A switch, and the fourth switch. [Structure 9] A power supply system as described in Structure 7, wherein The switch unit includes a fourth switch (SW4) provided in a bypass path (160) connecting the negative terminal of the first series connection body to the high-voltage ground wire. The switch control unit is configured to be able to select, as the first connection state, a first series connection state in which a plurality of said power storage units are connected in series with respect to the high-voltage power line and a first parallel connection state in which a plurality of said power storage units are connected in parallel with respect to the high-voltage power line. The above-mentioned switch control unit sets the above-mentioned first series connection state by disconnecting the above-mentioned first A switch, the above-mentioned third A switch, the above-mentioned third B switch, and the above-mentioned fourth switch, and connecting the above-mentioned first B switch, the above-mentioned second A switch, and the above-mentioned second B switch. On the other hand, The first parallel connection state is set by disconnecting the above-mentioned second B switch, the above-mentioned third A switch, and the above-mentioned third B switch, and connecting the above-mentioned first A switch, the above-mentioned first B switch, the above-mentioned second A switch, and the above-mentioned fourth switch. [Structure 10] A power supply system as described in Structure 3, wherein, The above-mentioned power storage unit includes a first power storage unit (31), a second power storage unit (32) with a lower voltage than the above-mentioned first power storage unit, and a third power storage unit (33) connected in series with the above-mentioned second power storage unit. The above-mentioned switch unit includes: A first A switch (SW1a), which is arranged in a first A electrical path (1A) connecting the positive terminal of the above-mentioned first power storage unit and the above-mentioned high-voltage power line; A first B switch (SW1b), which is arranged in a first B electrical path (1B) connecting the negative terminal of the above-mentioned first power storage unit and the above-mentioned high-voltage ground wire; A second A switch (SW2a, SW5), which switches the energization and power-off of a second A electrical path (2A) connecting the positive terminal of a first series connection body (40) composed of the above-mentioned second power storage unit and the above-mentioned third power storage unit and the above-mentioned high-voltage power line; A second B switch (SW2b), which is arranged in a second B electrical path (2B) connecting the negative terminal of the above-mentioned first series connection body and the above-mentioned high-voltage ground wire; A third A switch (SW3a), which is arranged in a third A electrical path (3A) connecting the positive terminal of the above-mentioned second power storage unit and the above-mentioned low-voltage power line; and A third B switch (SW3b), which is arranged in a third B electrical path (3B) connecting the negative terminal of the above-mentioned second power storage unit and the above-mentioned low-voltage ground wire. The above-mentioned switch control unit sets the above-mentioned first connection state by disconnecting the above-mentioned third A switch and the above-mentioned third B switch, and connecting the above-mentioned first A switch, the above-mentioned first B switch, the above-mentioned second A switch, and the above-mentioned second B switch. The above-mentioned second connection state is set by disconnecting the above-mentioned second A switch and the above-mentioned second B switch, and connecting the above-mentioned first A switch, the above-mentioned first B switch, the above-mentioned third A switch, and the above-mentioned third B switch. [Structure 11] The power supply system described in Structure 3, wherein, The above-mentioned high-voltage power line includes a first high-voltage power line (H401) and a second high-voltage power line (H402), The above-mentioned high-voltage ground line includes a first high-voltage ground line (L401) and a second high-voltage ground line (L402), The above-mentioned power storage unit includes a first power storage unit (31), a second power storage unit (32) that is at a lower voltage than the above-mentioned first power storage unit, and a third power storage unit (33) connected in series with the above-mentioned second power storage unit, The above-mentioned power supply system is configured to be connected via the first high-voltage power line to a first inverter (420a) electrically connected to the first end side of the two ends of the armature winding (11) of the motor (10), and to transmit electric power between the first inverter and the first power storage unit, It is configured to be connected via the second high-voltage power line to a second inverter (420b) electrically connected to the second end side of the two ends of the above-mentioned armature winding, and to transmit electric power between the second inverter and a first series connection body (40) composed of the above-mentioned second power storage unit and the above-mentioned third power storage unit, The above-mentioned switch unit includes: A first A switch (SW1a), which is arranged in a first A electrical path (1A) connecting the positive terminal of the above-mentioned first power storage unit and the above-mentioned first high-voltage power line; A first B switch (SW1b), which is arranged in a first B electrical path (1B) connecting the negative terminal of the above-mentioned first power storage unit and the above-mentioned first high-voltage ground line; A second A switch (SW2a, SW5), which switches the energization and power-off of a second A electrical path (2A) connecting the positive terminal of the above-mentioned first series connection body (40) and the above-mentioned second high-voltage power line; A second B switch (SW2b), which is arranged in a second B electrical path (2B) connecting the negative terminal of the above-mentioned first series connection body and the above-mentioned second high-voltage ground line; A third A switch (SW3a), which is arranged in a third A electrical path (3A) connecting the positive terminal of the above-mentioned second power storage unit and the above-mentioned low-voltage power line; and A third B switch (SW3b), which is arranged in a third B electrical path (3B) connecting the negative terminal of the above-mentioned second power storage unit and the above-mentioned low-voltage ground line, The above-mentioned switch control unit sets the first connection state by disconnecting the above-mentioned third A switch and the above-mentioned third B switch and connecting the above-mentioned first A switch, the above-mentioned first B switch, the above-mentioned second A switch, and the above-mentioned second B switch. The second connection state is set by disconnecting the above-mentioned second A switch and the above-mentioned second B switch and connecting the above-mentioned first A switch, the above-mentioned first B switch, the above-mentioned third A switch, and the above-mentioned third B switch. [Structure 12] A power supply system as described in Structure 3, wherein the above-mentioned power storage unit includes a first power storage unit (31) and a second power storage unit (32) with a lower voltage than the above-mentioned first power storage unit, the above-mentioned switch unit includes: a first A switch (SW1a), which is arranged in a first A electrical path (1A) connecting the positive terminal of the above-mentioned first power storage unit and the above-mentioned high-voltage power line; a first B switch (SW1b), which is arranged in a first B electrical path (1B) connecting the negative terminal of the above-mentioned first power storage unit and the above-mentioned high-voltage ground wire; a second A switch (SW2a), which is arranged in a second A electrical path (2A) connecting the positive terminal of the above-mentioned second power storage unit and the negative terminal of the above-mentioned first power storage unit; a second B switch (SW2b), which is arranged in a second B electrical path (2B) connecting the negative terminal of the above-mentioned second power storage unit and the above-mentioned high-voltage ground wire; a third A switch (SW3a), which is arranged in a third A electrical path (3A) connecting the positive terminal of the above-mentioned second power storage unit and the above-mentioned low-voltage power line; and a third B switch (SW3b), which is arranged in a third B electrical path (3B) connecting the negative terminal of the above-mentioned second power storage unit and the above-mentioned low-voltage ground wire, the above-mentioned switch control unit sets the first connection state by disconnecting the above-mentioned first B switch, the above-mentioned third A switch, and the above-mentioned third B switch and connecting the above-mentioned first A switch, the above-mentioned second A switch, and the above-mentioned second B switch. The above-mentioned second connection state is set by disconnecting the above-mentioned second A switch and the above-mentioned second B switch and connecting the above-mentioned first A switch, the above-mentioned first B switch, the above-mentioned third A switch, and the above-mentioned third B switch. [Structure 13] A power supply system as described in Structure 12, wherein The above power supply system is connected to an inverter (20) via the above high-voltage power line and the above high-voltage ground line, and the inverter is connected to a motor (10). The above switching unit includes a fourth switch (SW4) provided in a bypass path (60) connecting the neutral point of the armature winding of the above motor to the positive terminal of the above second power storage unit. The above switch control unit is configured to be able to select, as the above first connection state, a first series connection state in which a plurality of the above power storage units are connected in series with respect to the above high-voltage power line and a first parallel connection state in which a plurality of the above power storage units are connected in parallel with respect to the above high-voltage power line. The above switch control unit sets the above first series connection state by disconnecting the above first B switch, the above third A switch, the above third B switch, and the above fourth switch and turning on the above first A switch, the above second A switch, and the above second B switch. On the other hand, The above first parallel connection state is set by disconnecting the above second A switch, the above third A switch, and the above third B switch and turning on the above first A switch, the above first B switch, the above second B switch, and the above fourth switch. [Structure 14] A power supply system as described in Structure 3, wherein The above power storage unit includes a first power storage unit (31) and a second power storage unit (32) having a lower voltage than the above first power storage unit. The above switching unit includes: A first A switch (SW1a), the first A switch being provided in a first A electrical path (1A) connecting the positive terminal of the above first power storage unit to the above high-voltage power line; A first B switch (SW1b), the first B switch being provided in a first B electrical path (1B) connecting the negative terminal of the above first power storage unit to the above high-voltage ground line; A second A switch (SW2a), the second A switch being provided in a second A electrical path (2A) connecting the positive terminal of the above second power storage unit to the above high-voltage power line; A second B switch (SW2b), the second B switch being provided in a second B electrical path (2B) connecting the negative terminal of the above second power storage unit to the positive terminal of the above first power storage unit; A third A switch (SW3a), the third A switch being provided in a third A electrical path (3A) connecting the positive terminal of the above second power storage unit to the above low-voltage power line; and A third B switch (SW3b), the third B switch being provided in a third B electrical path (3B) connecting the negative terminal of the above second power storage unit to the above low-voltage ground line. The above switch control unit sets the first connection state by disconnecting the first A switch, the third A switch, and the third B switch, and connecting the first B switch, the second A switch, and the second B switch. The second connection state is set by disconnecting the second A switch and the second B switch, and connecting the first A switch, the first B switch, the third A switch, and the third B switch. [Structure 15] A power supply system as described in Structure 14, wherein The power supply system is connected to an inverter (20) via the above high-voltage power line and the above high-voltage ground line, and the inverter is connected to a motor (10). The switch unit includes a fourth switch (SW4) provided in a bypass path (60) connecting the neutral point of the armature winding of the motor to the negative terminal of the second power storage unit. The switch control unit is configured to be able to select, as the first connection state, a first series connection state in which a plurality of the power storage units are connected in series with respect to the high-voltage power line and a first parallel connection state in which a plurality of the power storage units are connected in parallel with respect to the high-voltage power line. The switch control unit sets the first series connection state by disconnecting the first A switch, the third A switch, the third B switch, and the fourth switch, and connecting the first B switch, the second A switch, and the second B switch. On the other hand, The first parallel connection state is set by disconnecting the second B switch, the third A switch, and the third B switch, and connecting the first A switch, the first B switch, the second A switch, and the fourth switch. [Structure 16] A power supply system as described in any one of Structures 3 to 15, wherein An abnormality determination unit is included, and the abnormality determination unit determines whether an abnormality has occurred in the power supply from the low-voltage power supply unit that supplies power to the low-voltage power line to the low-voltage power line. When the abnormality determination unit determines an abnormality in the first connection state, the switch control unit sets the second connection state. [Structure 17] A power supply system as described in any one of Structures 3 to 16, wherein including a load control unit, in a case where the switching control unit switches from the first connection state to the second connection state, the load control unit restricts the voltage input to a high-voltage load that receives power from the power supply system before switching to the second connection state in the first connection state. After the load control unit restricts the input voltage to the high-voltage load, the switching control unit sets the second connection state. [Structure 18] A power supply system according to any one of Structures 3 to 17, wherein an inverter and a smoothing capacitor are connected to the high-voltage power line, including an inverter control unit that controls the inverter, the switching control unit is configured to temporarily cut off the power conduction between the power storage unit and the high-voltage power line when switching from the first connection state to the second connection state, and then switch to the second connection state. During the power cut-off between the power storage unit and the high-voltage power line, the inverter control unit controls the inverter and discharges the smoothing capacitor to adjust the voltage. [Structure 19] A power supply system according to any one of Structures 3 to 18, wherein the power supply system includes: an estimation unit that estimates the charge state of each of the plurality of power storage units; and a charge / discharge control unit that, in the second connection state, charges or discharges the power storage unit connected to the low-voltage power line when the difference between the charge state of the power storage unit connected to the low-voltage power line and the charge state of the other power storage units is equal to or greater than a threshold value, or when the charge state of the power storage unit connected to the low-voltage power line is outside a predetermined range in the second connection state, so as to make the charge states close to each other. [Structure 20] A power supply system according to Structure 19, wherein including a voltage conversion device that boosts the voltage, in the second connection state, when the charge / discharge control unit discharges the power storage unit connected to the low-voltage power line to make the charge states close to each other, the voltage conversion device is used to boost the output power of the power storage unit and supply it to the high-voltage power line side. [Structure 21] A power supply system according to Structure 19, wherein including a voltage conversion device that steps down the voltage, In the second connection state, when the charge-discharge control unit charges the power storage unit connected to the low-voltage power line to make the power storage states of all power storage units closer, the voltage conversion device steps down the power input from the power storage unit connected to the high-voltage power line and charges the power storage unit connected to the low-voltage power line. [Structure 22] A power supply system according to any one of Structures 3 to 21, wherein it includes a voltage conversion device, and in the first connection state, the voltage conversion device steps down the power input from the power storage unit connected to the high-voltage power line and supplies it to the low-voltage power line. When the voltage conversion device is switched from the first connection state to the second connection state by the switch control unit, after the setting of the second connection state is completed, the supply to the low-voltage power line is stopped. [Structure 23] A power supply system according to any one of Structures 3 to 22, wherein it includes a voltage conversion device, and in the first connection state, the voltage conversion device steps down the power input from the power storage unit connected to the high-voltage power line and supplies it to the low-voltage power line. When the voltage conversion device is switched from the third connection state to the second connection state by the switch control unit, after the setting of the second connection state is completed, the supply to the low-voltage power line is started. [Structure 24] A power supply system according to any one of Structures 3 to 23, wherein it includes a power consumption monitoring unit for monitoring the power consumption of the low-voltage load. In the third connection state, when the power consumption monitoring unit determines that the power consumption exceeds a threshold value, the switch control unit sets the first connection state or the second connection state. [Structure 25] A power supply system according to any one of Structures 3 to 24, wherein it includes a power consumption monitoring unit for monitoring the power consumption of the low-voltage load. In the first connection state, when the power consumption monitoring unit determines that the power consumption is below the threshold value, the switch control unit sets the third connection state. [Structure 26] A program, which is executed by a control device (100) of a power supply system (30, 230, 330, 430). The above power supply system is connected to a high-voltage power line (H1) connected to a high-voltage load (71) and a low-voltage power line (H2) connected to a low-voltage load (72), and includes a plurality of power storage units (31 to 33). The above program is configured to execute a switching process for controlling a switch unit (SW) that switches the connection states of the plurality of above power storage units. In the above switching process, a first connection state and a third connection state are set. In the above first connection state, a part or all of the plurality of above power storage units are connected between the high-voltage power line and the high-voltage ground line. In the above third connection state, the power supply between the high-voltage ground line and the low-voltage ground line is cut off, and a part of the plurality of above power storage units is connected between the low-voltage power line and the low-voltage ground line. [Structure 27] The program as described in Structure 26, wherein, In the above switching process, as the first connection state, a first series connection state in which the plurality of above power storage units are connected in series to the above high-voltage power line and a first parallel connection state in which the plurality of above power storage units are connected in parallel to the above high-voltage power line can be selected. [Structure 28] The program as described in Structure 26 or 27, wherein, It includes an abnormality determination step of determining whether an abnormality has occurred in the power supply from a low-voltage power supply unit that supplies power to the above low-voltage power line to the above low-voltage power line. In the above switching process, when it is determined to be abnormal by the above abnormality determination step in the above first connection state, the above third connection state is set.

[0170] Although the present disclosure has been described based on the embodiments, it should be understood that the present disclosure is not limited to the above embodiments and structures. The present disclosure also includes various modification examples and modifications within the equivalent range. In addition, various combinations, methods, and further combinations and methods including only one element, more than one element, or less than one element thereof also belong to the scope and ideological range of the present disclosure.

Claims

1. A power supply system, the power supply system (30, 230, 330, 430) being connected to a high-voltage power line (H1) connected to a high-voltage load (71) and a low-voltage power line (H2) connected to a low-voltage load (72), and including a plurality of power storage units (31 - 33). The power supply system comprises: a switch unit (SW) that switches the connection states of the plurality of power storage units; and a switch control unit (100) that controls the switch unit, the switch control unit setting a first connection state and a third connection state, the first connection state connecting a part or all of the plurality of power storage units between the high-voltage power line and the high-voltage ground line (L1), the third connection state cutting off the power supply between the high-voltage ground line and the low-voltage ground line (L2) and connecting a part of the plurality of power storage units between the low-voltage power line and the low-voltage ground line.

2. The power supply system according to claim 1, wherein the switch control unit is configured to be able to select, as the first connection state, a first series connection state in which the plurality of power storage units are connected in series with respect to the high-voltage power line and a first parallel connection state in which the plurality of power storage units are connected in parallel with respect to the high-voltage power line.

3. The power supply system according to claim 1, wherein the switch control unit controls the switch unit to set a second connection state, the second connection state cutting off the power supply between the high-voltage ground line and the low-voltage ground line (L2), connecting a part of the plurality of power storage units between the low-voltage power line and the low-voltage ground line, and connecting a part or all of the remaining power storage units between the high-voltage power line and the high-voltage ground line.

4. The power supply system according to claim 3, wherein the power storage unit includes a first power storage unit (31), a second power storage unit (32) having a lower voltage than the first power storage unit, and a third power storage unit (33) connected in series with the second power storage unit, the switch unit includes: a first A switch (SW1a) provided in a first A electrical path (1A) connecting the positive terminal of the first power storage unit to the high-voltage power line; a first B switch (SW1b) provided in a first B electrical path (1B) connecting the negative terminal of the first power storage unit to the high-voltage ground line; second A switches (SW2a, SW5) that switch the energization and power-off of a second A electrical path (2A) connecting the positive terminal of a first series connection body (40) to the negative terminal of the first power storage unit, the first series connection body being formed by connecting the second power storage unit and the third power storage unit in series; a second B switch (SW2b) provided in a second B electrical path (2B) connecting the negative terminal of the first series connection body to the high-voltage ground line; A third A switch (SW3a) disposed in a third A electrical path (3A) connecting the positive terminal of the second power storage unit to the low-voltage power line; and A third B switch (SW3b) disposed in a third B electrical path (3B) connecting the negative terminal of the second power storage unit to the low-voltage ground line, The switch control unit sets a first connection state by disconnecting the first B switch, the third A switch, and the third B switch and turning on the first A switch, the second A switch, and the second B switch, The second connection state is set by disconnecting the second A switch and the second B switch and turning on the first A switch, the first B switch, the third A switch, and the third B switch.

5. The power supply system according to claim 4, Characterized in that, The power supply system is connected to an inverter (20) via the high-voltage power line and the high-voltage ground line, and the inverter is connected to a motor (10), The switch unit includes a fourth switch (SW4) disposed in a bypass path (60) connecting the neutral point of the armature winding of the motor to the positive terminal of the first series connection body, The switch control unit is configured to be able to select, as the first connection state, a first series connection state in which a plurality of the power storage units are connected in series with respect to the high-voltage power line and a first parallel connection state in which a plurality of the power storage units are connected in parallel with respect to the high-voltage power line, The switch control unit sets the first series connection state by disconnecting the first B switch, the third A switch, the third B switch, and the fourth switch and turning on the first A switch, the second A switch, and the second B switch. On the other hand, the first parallel connection state is set by disconnecting the second A switch, the third A switch, and the third B switch and turning on the first A switch, the first B switch, the second B switch, and the fourth switch.

6. The power supply system according to claim 4, Characterized in that, The switch unit includes a fourth switch (SW4) disposed in a bypass path (160) connecting the positive terminal of the first series connection body to the high-voltage power line, The switch control unit is configured to be able to select, as the first connection state, a first series connection state in which a plurality of the power storage units are connected in series with respect to the high-voltage power line and a first parallel connection state in which a plurality of the power storage units are connected in parallel with respect to the high-voltage power line, The switch control unit sets the first series connection state by disconnecting the first B switch, the third A switch, the third B switch, and the fourth switch and turning on the first A switch, the second A switch, and the second B switch. On the other hand, the first parallel connection state is set by disconnecting the second A switch, the third A switch, and the third B switch and turning on the first A switch, the first B switch, the second B switch, and the fourth switch.

7. The power supply system according to claim 3, wherein, the electricity storage unit includes a first electricity storage unit (31), a second electricity storage unit (32) having a lower voltage than the first electricity storage unit, and a third electricity storage unit (33) connected in series with the second electricity storage unit; the switch unit includes: a first A switch (SW1a) disposed in a first A electrical path (1A) connecting the positive terminal of the first electricity storage unit to the high-voltage power line; a first B switch (SW1b) disposed in a first B electrical path (1B) connecting the negative terminal of the first electricity storage unit to the high-voltage ground line; a second A switch (SW2a, SW5) that switches on and off the power supply of a second A electrical path (2A) connecting the positive terminal of a first series connection body (40) to the high-voltage power line, the first series connection body being formed by connecting the second electricity storage unit and the third electricity storage unit in series; a second B switch (SW2b) disposed in a second B electrical path (2B) connecting the negative terminal of the first series connection body to the positive terminal of the first electricity storage unit; a third A switch (SW3a) disposed in a third A electrical path (3A) connecting the positive terminal of the second electricity storage unit to the low-voltage power line; and a third B switch (SW3b) disposed in a third B electrical path (3B) connecting the negative terminal of the second electricity storage unit to the low-voltage ground line, the switch control unit sets the first connection state by disconnecting the first A switch, the third A switch, and the third B switch and connecting the first B switch, the second A switch, and the second B switch; the second connection state is set by disconnecting the second A switch and the second B switch and connecting the first A switch, the first B switch, the third A switch, and the third B switch.

8. The power supply system according to claim 7, wherein, the power supply system is connected to an inverter (20) via the high-voltage power line and the high-voltage ground line, and the inverter is connected to a motor (10), the switch unit includes a fourth switch (SW4) disposed in a bypass path (60) connecting the neutral point of the armature winding of the motor to the negative terminal of the first series connection body, the switch control unit is configured to be able to select, as the first connection state, a first series connection state in which a plurality of the electricity storage units are connected in series with respect to the high-voltage power line and a first parallel connection state in which a plurality of the electricity storage units are connected in parallel with respect to the high-voltage power line, The switch control unit sets the first series connection state by disconnecting the first A switch, the third A switch, the third B switch, and the fourth switch and connecting the first B switch, the second A switch, and the second B switch. On the other hand, the first parallel connection state is set by disconnecting the second B switch, the third A switch, and the third B switch and connecting the first A switch, the first B switch, the second A switch, and the fourth switch.

9. The power supply system according to claim 7, characterized in that the switch unit includes a fourth switch (SW4) provided in a bypass path (160) connecting the negative terminal of the first series connection body and the high-voltage grounding wire, the switch control unit is configured to be able to select, as the first connection state, a first series connection state in which a plurality of the power storage units are connected in series with respect to the high-voltage power line and a first parallel connection state in which a plurality of the power storage units are connected in parallel with respect to the high-voltage power line, the switch control unit sets the first series connection state by disconnecting the first A switch, the third A switch, the third B switch, and the fourth switch and connecting the first B switch, the second A switch, and the second B switch. On the other hand, the first parallel connection state is set by disconnecting the second B switch, the third A switch, and the third B switch and connecting the first A switch, the first B switch, the second A switch, and the fourth switch.

10. The power supply system according to claim 3, characterized in that the power storage unit includes a first power storage unit (31), a second power storage unit (32) having a lower voltage than the first power storage unit, and a third power storage unit (33) connected in series with the second power storage unit, the switch unit includes: a first A switch (SW1a) provided in a first A electrical path (1A) connecting the positive terminal of the first power storage unit and the high-voltage power line; a first B switch (SW1b) provided in a first B electrical path (1B) connecting the negative terminal of the first power storage unit and the high-voltage grounding wire; a second A switch (SW2a, SW5) that switches the energization and energization cut-off of a second A electrical path (2A) connecting the positive terminal of the first series connection body (40) and the high-voltage power line, and the first series connection body includes the second power storage unit and the third power storage unit; a second B switch (SW2b) provided in a second B electrical path (2B) connecting the negative terminal of the first series connection body and the high-voltage grounding wire; a third A switch (SW3a) provided in a third A electrical path (3A) connecting the positive terminal of the second power storage unit and the low-voltage power line; and A third B switch (SW3b) is disposed in a third B electrical path (3B) connecting the negative terminal of the second power storage unit to the low-voltage ground wire. The switch control unit sets the first connection state by disconnecting the third A switch and the third B switch and closing the first A switch, the first B switch, the second A switch, and the second B switch. The second connection state is set by disconnecting the second A switch and the second B switch and closing the first A switch, the first B switch, the third A switch, and the third B switch.

11. The power supply system according to claim 3, characterized in that the high-voltage power line includes a first high-voltage power line (H401) and a second high-voltage power line (H402), the high-voltage ground wire includes a first high-voltage ground wire (L401) and a second high-voltage ground wire (L402), the power storage unit includes a first power storage unit (31), a second power storage unit (32) having a lower voltage than the first power storage unit, and a third power storage unit (33) connected in series with the second power storage unit, the power supply system is configured to be connected via the first high-voltage power line to a first inverter (420a) electrically connected to a first end side of both ends of the armature winding (11) of the motor (10), and to transmit electric power between the first inverter and the first power storage unit, configured to be connected via the second high-voltage power line to a second inverter (420b) electrically connected to a second end side of both ends of the armature winding, and to transmit electric power between the second inverter and a first series connection body (40) including the second power storage unit and the third power storage unit, The switch unit includes: A first A switch (SW1a) disposed in a first A electrical path (1A) connecting the positive terminal of the first power storage unit to the first high-voltage power line; A first B switch (SW1b) disposed in a first B electrical path (1B) connecting the negative terminal of the first power storage unit to the first high-voltage ground wire; Second A switches (SW2a, SW5) that switch the energization and power-off of a second A electrical path (2A) connecting the positive terminal of the first series connection body (40) to the second high-voltage power line; A second B switch (SW2b) disposed in a second B electrical path (2B) connecting the negative terminal of the first series connection body to the second high-voltage ground wire; A third A switch (SW3a) disposed in a third A electrical path (3A) connecting the positive terminal of the second power storage unit to the low-voltage power line; and A third B switch (SW3b) disposed in a third B electrical path (3B) connecting the negative terminal of the second power storage unit to the low-voltage ground wire. The switch control unit sets the first connection state by disconnecting the third A switch and the third B switch and connecting the first A switch, the first B switch, the second A switch, and the second B switch. The second connection state is set by disconnecting the second A switch and the second B switch and connecting the first A switch, the first B switch, the third A switch, and the third B switch.

12. The power supply system according to claim 3, characterized in that the power storage unit includes a first power storage unit (31) and a second power storage unit (32) having a lower voltage than the first power storage unit, the switch unit includes: a first A switch (SW1a) provided in a first A electrical path (1A) connecting the positive terminal of the first power storage unit and the high-voltage power line; a first B switch (SW1b) provided in a first B electrical path (1B) connecting the negative terminal of the first power storage unit and the high-voltage ground line; a second A switch (SW2a) provided in a second A electrical path (2A) connecting the positive terminal of the second power storage unit and the negative terminal of the first power storage unit; a second B switch (SW2b) provided in a second B electrical path (2B) connecting the negative terminal of the second power storage unit and the high-voltage ground line; a third A switch (SW3a) provided in a third A electrical path (3A) connecting the positive terminal of the second power storage unit and the low-voltage power line; and a third B switch (SW3b) provided in a third B electrical path (3B) connecting the negative terminal of the second power storage unit and the low-voltage ground line, the switch control unit sets the first connection state by disconnecting the first B switch, the third A switch, and the third B switch and connecting the first A switch, the second A switch, and the second B switch, and sets the second connection state by disconnecting the second A switch and the second B switch and connecting the first A switch, the first B switch, the third A switch, and the third B switch.

13. The power supply system according to claim 12, characterized in that the power supply system is connected to an inverter (20) via the high-voltage power line and the high-voltage ground line, and the inverter is connected to a motor (10), the switch unit includes a fourth switch (SW4) provided in a bypass path (60) connecting the neutral point of the armature winding of the motor and the positive terminal of the second power storage unit, the switch control unit is configured to be able to select, as the first connection state, a first series connection state in which a plurality of the power storage units are connected in series with respect to the high-voltage power line and a first parallel connection state in which a plurality of the power storage units are connected in parallel with respect to the high-voltage power line. The switch control unit sets the first series connection state by disconnecting the first B switch, the third A switch, the third B switch, and the fourth switch, and connecting the first A switch, the second A switch, and the second B switch. On the other hand, the switch control unit sets the first parallel connection state by disconnecting the second A switch, the third A switch, and the third B switch, and connecting the first A switch, the first B switch, the second B switch, and the fourth switch.

14. The power supply system according to claim 3, wherein: the power storage unit includes a first power storage unit (31) and a second power storage unit (32) having a lower voltage than the first power storage unit; the switch unit includes: a first A switch (SW1a) disposed in a first A electrical path (1A) connecting the positive terminal of the first power storage unit to the high-voltage power line; a first B switch (SW1b) disposed in a first B electrical path (1B) connecting the negative terminal of the first power storage unit to the high-voltage ground line; a second A switch (SW2a) disposed in a second A electrical path (2A) connecting the positive terminal of the second power storage unit to the high-voltage power line; a second B switch (SW2b) disposed in a second B electrical path (2B) connecting the negative terminal of the second power storage unit to the positive terminal of the first power storage unit; a third A switch (SW3a) disposed in a third A electrical path (3A) connecting the positive terminal of the second power storage unit to the low-voltage power line; and a third B switch (SW3b) disposed in a third B electrical path (3B) connecting the negative terminal of the second power storage unit to the low-voltage ground line, the switch control unit sets the first connection state by disconnecting the first A switch, the third A switch, and the third B switch, and connecting the first B switch, the second A switch, and the second B switch; the switch control unit sets the second connection state by disconnecting the second A switch and the second B switch, and connecting the first A switch, the first B switch, the third A switch, and the third B switch.

15. The power supply system according to claim 14, wherein: the power supply system is connected to an inverter (20) via the high-voltage power line and the high-voltage ground line, and the inverter is connected to a motor (10); the switch unit includes a fourth switch (SW4) disposed in a bypass path (60) connecting the neutral point of the armature winding of the motor to the negative terminal of the second power storage unit; the switch control unit is configured to be able to select, as the first connection state, a first series connection state in which a plurality of the power storage units are connected in series with respect to the high-voltage power line and a first parallel connection state in which a plurality of the power storage units are connected in parallel with respect to the high-voltage power line. The switch control unit sets the first series connection state by disconnecting the first A switch, the third A switch, the third B switch, and the fourth switch, and connecting the first B switch, the second A switch, and the second B switch. On the other hand, the first parallel connection state is set by disconnecting the second B switch, the third A switch, and the third B switch, and connecting the first A switch, the first B switch, the second A switch, and the fourth switch.

16. The power supply system according to any one of claims 3 to 15, characterized in that it includes an abnormality determination unit that determines whether an abnormality has occurred in the power supply from the low-voltage power supply unit to the low-voltage power line, and the low-voltage power supply unit supplies power to the low-voltage power line, when the abnormality determination unit determines an abnormality in the first connection state, the switch control unit sets the second connection state.

17. The power supply system according to any one of claims 3 to 15, characterized in that it includes a load control unit that, when the switch control unit switches from the first connection state to the second connection state, limits the voltage input to a high-voltage load supplied with power from the power supply system in the first connection state before switching to the second connection state, after the load control unit limits the input voltage to the high-voltage load, the switch control unit sets the second connection state.

18. The power supply system according to any one of claims 3 to 15, characterized in that an inverter and a smoothing capacitor are connected to the high-voltage power line, it includes an inverter control unit that controls the inverter, the switch control unit is configured to temporarily cut off the power connection between the power storage unit and the high-voltage power line when switching from the first connection state to the second connection state, and then switch to the second connection state, during the disconnection of the power connection between the power storage unit and the high-voltage power line, the inverter control unit controls the inverter to discharge the smoothing capacitor to adjust the voltage.

19. The power supply system according to any one of claims 3 to 15, characterized in that the power supply system includes: an estimation unit that estimates the charge storage state of each of the plurality of power storage units; and a charge-discharge control unit that, in the second connection state, charges or discharges the power storage unit connected to the low-voltage power line when the difference between the charge storage state of the power storage unit connected to the low-voltage power line and the charge storage state of the other power storage units is equal to or greater than a threshold value, or when the charge storage state of the power storage unit connected to the low-voltage power line is outside a predetermined range in the second connection state, so that the charge storage states are close to each other.

20. The power supply system according to claim 19, characterized in that it includes a voltage conversion device that boosts the voltage, In the second connection state, when the charge / discharge control unit discharges the power storage unit connected to the low-voltage power line to make the power storage states of the respective power storage units approach, the voltage conversion device is used to boost the output power of the power storage unit and supply it to the high-voltage power line side.

21. The power supply system according to claim 19, wherein, it includes a voltage conversion device for stepping down the voltage, in the second connection state, when the charge / discharge control unit charges the power storage unit connected to the low-voltage power line to make the power storage states of the respective power storage units approach, the voltage conversion device is used to step down the power input from the power storage unit connected to the high-voltage power line and charge the power storage unit connected to the low-voltage power line.

22. The power supply system according to any one of claims 3 to 15, wherein, it includes a voltage conversion device, and in the first connection state, the voltage conversion device steps down the power input from the power storage unit connected to the high-voltage power line and supplies it to the low-voltage power line, when the switch control unit switches from the first connection state to the second connection state, after the setting of the second connection state is completed, the voltage conversion device stops supplying power to the low-voltage power line.

23. The power supply system according to any one of claims 3 to 15, wherein, it includes a voltage conversion device, and in the first connection state, the voltage conversion device steps down the power input from the power storage unit connected to the high-voltage power line and supplies it to the low-voltage power line, when the switch control unit switches from the third connection state to the second connection state, after the setting of the second connection state is completed, the voltage conversion device starts supplying power to the low-voltage power line.

24. The power supply system according to any one of claims 3 to 15, wherein, it includes a power consumption monitoring unit for monitoring the power consumption of the low-voltage load, in the third connection state, when the power monitoring unit determines that the power consumption exceeds a threshold value, the switch control unit sets the first connection state or the second connection state.

25. The power supply system according to any one of claims 3 to 15, wherein, it includes a power consumption monitoring unit for monitoring the power consumption of the low-voltage load, in the first connection state, when the power monitoring unit determines that the power consumption is below the threshold value, the switch control unit sets the third connection state.

26. A program, which is executed by a control device (100) of a power supply system (30, 230, 330, 430), the power supply system is connected to a high-voltage power line (H1) connected to a high-voltage load (71) and a low-voltage power line (H2) connected to a low-voltage load (72), and includes a plurality of power storage units (31 to 33), the program is configured to execute a switching process for controlling a switch unit (SW) that switches the connection states of the plurality of power storage units, in the switching process, a first connection state and a third connection state are set, The first connection state connects some or all of the plurality of power storage units between the high-voltage power supply line and the high-voltage ground line. The third connection state cuts off the power supply between the high-voltage ground line and the low-voltage ground line, and connects some of the plurality of power storage units between the low-voltage power supply line and the low-voltage ground line.

27. The program according to claim 26, characterized in that in the switching process, as the first connection state, a first series connection state in which a plurality of the power storage units are connected in series with respect to the high-voltage power supply line and a first parallel connection state in which a plurality of the power storage units are connected in parallel with respect to the high-voltage power supply line can be selected.

28. The program according to claim 26 or 27, characterized in that it includes an abnormality determination step for determining whether an abnormality has occurred in the power supply from the low-voltage power supply unit to the low-voltage power supply line, and the low-voltage power supply unit supplies power to the low-voltage power supply line, in the switching process, when it is determined to be abnormal by the abnormality determination step in the first connection state, the third connection state is set.

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