Storage battery module and storage battery system

Abstract

A storage battery module according to an embodiment of the present disclosure comprises: a photocoupler having a first power supply circuit capable of operating on the basis of power supplied from an external device, a first switch provided to a current path connecting an output terminal of the first power supply circuit and a ground node, a light-emitting element provided to the current path, and a light-receiving element; a first control circuit capable of turning on the first switch in a period corresponding to a rise in the power supply voltage generated by the first power supply circuit; a storage battery; a second power supply circuit capable of operating on the basis of power supplied from the storage battery; a second switch provided to a power supply path connecting the storage battery and an input terminal of the second power supply circuit; a processing circuit capable of operating on the basis of power supplied from the second power supply circuit; and a second control circuit capable of turning on the second switch on the basis of a light reception result from the light-receiving element and an instruction from the processing circuit.

Description

[Technical field]

[0001] The present disclosure relates to a storage battery module and a storage battery system including a storage battery. [Background technology]

[0002] In electronic circuits, signals are often exchanged between two circuits that are electrically isolated from each other. Patent Document 1 discloses a technique for transmitting signals through a photocoupler between two circuits that are electrically isolated from each other. This photocoupler transmits signals for a period of time that corresponds to a time constant determined by a resistive element and a capacitive element from the timing when the power is turned on. The current flowing through the photocoupler is set by this resistive element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-153779 Summary of the Invention

[0004] The storage battery module includes, for example, a primary circuit including a storage battery and a secondary circuit that exchanges signals with the outside. These circuits are, for example, DC-insulated from each other. Control signals are exchanged between these two circuits. For such circuits, a high degree of freedom in design is desired, and an improvement in the degree of freedom in design is expected.

[0005] It is desirable to provide a storage battery module and a storage battery system that allow greater freedom in design.

[0006] The storage battery module according to an embodiment of the present disclosure includes a first power supply circuit, a first switch, a photocoupler, a first control circuit, a storage battery, a second power supply circuit, a second switch, a processing circuit, and a second control circuit. The first power supply circuit is operable based on power supplied from an external device. The first switch is provided in a current path connecting an output terminal of the first power supply circuit and a ground node. The photocoupler has a light-emitting element and a light-receiving element provided in the current path. The first control circuit is capable of turning on the first switch during a period corresponding to the rise of a power supply voltage generated by the first power supply circuit. The storage battery is capable of storing power. The second power supply circuit is operable based on power supplied from the storage battery. The second switch is provided in a power supply path connecting the storage battery and an input terminal of the second power supply circuit. The processing circuit is operable based on power supplied from the second power supply circuit and is capable of monitoring the operating state of the storage battery. The second control circuit is capable of turning on the second switch based on the result of light reception by the light receiving element and an instruction from the processing circuit.

[0007] A storage battery system according to an embodiment of the present disclosure includes a plurality of storage battery modules and a storage battery control device capable of controlling the operation of the plurality of storage battery modules. Each of the plurality of storage battery modules includes a first power supply circuit, a first switch, a photocoupler, a first control circuit, a storage battery, a second power supply circuit, a second switch, a processing circuit, and a second control circuit. The first power supply circuit is operable based on power supplied from the storage battery control device. The first switch is provided in a current path connecting an output terminal of the first power supply circuit and a ground node. The photocoupler has a light-emitting element and a light-receiving element provided in the current path. The first control circuit is capable of turning on the first switch during a period corresponding to the rise of a power supply voltage generated by the first power supply circuit. The storage battery is capable of storing power. The second power supply circuit is operable based on power supplied from the storage battery. The second switch is provided in a power supply path connecting the storage battery and an input terminal of the second power supply circuit. The processing circuit is operable based on the power supplied from the second power supply circuit and is capable of monitoring the operating state of the storage battery. The second control circuit is capable of turning on the second switch based on the result of light reception by the light receiving element and an instruction from the processing circuit.

[0008] According to the storage battery module and storage battery system according to an embodiment of the present disclosure, it is possible to increase the degree of freedom in design. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram illustrating an example of a configuration of a power storage system including a storage battery system according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a circuit diagram illustrating a configuration example of the storage battery module according to the first embodiment. [Diagram 3] FIG. 3 is a timing waveform diagram illustrating an example of the operation of the control circuit in the secondary side circuit shown in FIG. [Figure 4]FIG. 4 is a circuit diagram illustrating a configuration example of a storage battery module according to a modified example of the first embodiment. [Diagram 5] FIG. 5 is a circuit diagram illustrating a configuration example of a storage battery module according to the second embodiment. [Figure 6] FIG. 6 is a timing waveform diagram illustrating an example of the operation of the control circuit in the secondary side circuit shown in FIG. [Figure 7] FIG. 7 is a block diagram showing a configuration example of a power storage system according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be made in the following order. 1. First embodiment 2. Second embodiment

[0011] <1. First embodiment> [Configuration example] Fig. 1 shows an example of the configuration of a power storage system 1 including a storage battery module according to an embodiment. The power storage system 1 is configured to store power supplied from a system power source 9 such as a commercial power source, or to supply the stored power to a load device 8 or the system power source 9. The power storage system 1 includes a power conditioner 11, a breaker 12, an energy control device 13, and a storage battery system 2. In Fig. 1, the power supply path is indicated by a thick line.

[0012] The power conditioner 11 is configured to convert AC power supplied from the system power supply 9 into DC power by AC / DC conversion, and supply the converted DC power to the storage battery system 2 via the breaker 12. The power conditioner 11 also converts DC power supplied from the storage battery system 2 via the breaker 12 into AC power by DC / AC conversion, and supplies the converted AC power to the load device 8 and the system power supply 9. The power conditioner 11 is connected to the storage battery system 2 via a positive power supply line PP and a negative power supply line PN.

[0013] The breaker 12 is provided in a power supply path between the power conditioner 11 and the storage battery system 2, and is configured to cut off the power supply when, for example, an overcurrent or a short circuit occurs.

[0014] The energy control device 13 is a so-called EMU (Energy Management Unit), and is configured to control the operation of the power storage system 1 by communicating with the control device 7, which is a higher-level device. The energy control device 13 controls the operation of the power conditioner 11 by communicating with the power conditioner 11, and also controls the operation of the storage battery system 2 by communicating with a storage battery control device 20 (described later) of the storage battery system 2.

[0015] The storage battery system 2 is configured to charge the storage battery based on DC power supplied from the power conditioner 11 via the breaker 12, or to supply the power charged in the storage battery to the power conditioner 11 via the breaker 12. The storage battery system 2 has a storage battery control device 20 and a plurality of storage battery modules 23.

[0016] The battery control device 20 is a so-called BMU (Battery Management Unit), and is configured to control the operation of the battery system 2 by controlling the charging and discharging of the multiple battery modules 23 based on instructions from the energy control device 13. The battery control device 20 has a contactor 21 and a controller 22.

[0017] The contactor 21 is provided on the power supply line PP, and is configured to control the power supply via the power supply line PP by being turned on or off based on an instruction from the controller 22.

[0018] The controller 22 is configured to grasp the operation state of each of the storage battery modules 23 by communicating with the storage battery modules 23, and to control the operation of the storage battery system 2 based on an instruction from the energy control device 13. The controller 22 also supplies a power supply voltage V1 to the storage battery modules 23. The power supply voltage V1 is, for example, 24 V. The communication connection between the controller 22 and the storage battery modules 23 may be, for example, a daisy chain connection. Note that in this example, the controller 22 supplies the power supply voltage V1 to the storage battery modules 23, but this is not limited thereto. Instead, for example, the energy control device 13 may supply the power supply voltage V1 to the storage battery modules 23.

[0019] Each of the multiple storage battery modules 23 has a storage battery 31, a positive terminal TP, and a negative terminal TN, and is configured to store power. In this example, the storage battery system 2 has eight storage battery modules 23 (storage battery modules 23A to 23H). In this example, the storage battery modules 23A and 23B are connected in parallel to each other, the storage battery modules 23C and 23D are connected in parallel to each other, the storage battery modules 23E and 23F are connected in parallel to each other, and the storage battery modules 23G and 23H are connected in parallel to each other. The storage battery modules 23A and 23B, the storage battery modules 23C and 23D, the storage battery modules 23E and 23F, and the storage battery modules 23G and 23H are connected in series in this order. The positive terminals TP of the storage battery modules 23A and 23B are connected to a power supply line PP, and the negative terminals TN of the storage battery modules 23G and 23H are connected to a power supply line PN.

[0020] 2 shows an example of the configuration of the storage battery module 23. The storage battery module 23 includes a storage battery 31, a transistor 32, a DC / DC conversion circuit 33, a processing circuit 34, a control circuit 35, a photocoupler 24, an isolator 27, a DC / DC conversion circuit 41, a transistor 42, a control circuit 43, a resistive element 48, and a communication circuit 49. The storage battery 31, the transistor 32, the DC / DC conversion circuit 33, the processing circuit 34, the control circuit 35, a phototransistor 26 (described later) of the photocoupler 24, and a part of the isolator 27 constitute a primary side circuit 30 of the storage battery module 23. The DC / DC conversion circuit 41, the transistor 42, the control circuit 43, the resistive element 48, a light-emitting diode 25 (described later) of the photocoupler 24, the communication circuit 49, and a part of the isolator 27 constitute a secondary side circuit 40 of the storage battery module 23.

[0021] The storage battery 31 is configured to store power. The storage battery 31 has, for example, a plurality of storage battery cells (not shown) connected in series and parallel. The positive electrode of the storage battery 31 is connected to a node NP that is connected to a positive terminal TP, and the negative electrode of the storage battery 31 is connected to a node NN that is connected to a negative terminal TN.

[0022] The transistor 32 is a P-type field effect transistor, with a source connected to the node NP, a gate connected to the control circuit 35, and a drain connected to the input terminal of the DC / DC conversion circuit 33. The transistor 32 supplies DC power supplied from the storage battery 31 to the DC / DC conversion circuit 33 by being turned on.

[0023] The DC / DC conversion circuit 33 is configured to generate a power supply voltage VPRI by performing DC / DC conversion based on the DC power supplied from the storage battery 31. The DC / DC conversion circuit 33 then supplies the generated power supply voltage VPRI to the processing circuit 34 and the isolator 27.

[0024] The processing circuit 34 is configured using, for example, a microcontroller, and is configured to monitor the operating state of the storage battery 31 by monitoring the voltage, current, temperature, etc. of the storage battery 31. The processing circuit 34 communicates with the controller 22 (FIG. 1) of the storage battery control device 20 via the isolator 27 and the communication circuit 49, thereby supplying information about the operating state of the storage battery 31 to the controller 22.

[0025] The processing circuit 34 operates based on the power supply of the power supply voltage VPRI supplied from the DC / DC conversion circuit 33. The processing circuit 34 controls the operation of a transistor 38 (described later) of the control circuit 35 by supplying a control signal CTL to the transistor 38. Specifically, after the processing circuit 34 is started up by being supplied with the power supply voltage VPRI, the processing circuit 34 turns the control signal CTL to a high level (active level) to turn on the transistor 38. When the supply of the power supply voltage V1 to the DC / DC conversion circuit 41 is stopped, the processing circuit 34 turns the control signal CTL to a low level (inactive level) based on a signal from the isolator 27 to turn off the transistor 38.

[0026] The control circuit 35 is configured to control the operation of the transistor 32 based on a control signal CTL from the processing circuit 34 and a signal from the photocoupler 24. The control circuit 35 has resistance elements 36 and 37, and a transistor 38. One end of the resistance element 36 is connected to the node NP, and the other end is connected to the gate of the transistor 32 and one end of the resistance element 37. One end of the resistance element 37 is connected to the other end of the resistance element 36 and the gate of the transistor 32, and the other end is connected to the drain of the transistor 38 and the collector of a phototransistor 26 (described later) of the photocoupler 24. The transistor 38 is an N-type field effect transistor, and the control signal CTL is supplied to the gate of the transistor 38 from the processing circuit 34, the drain is connected to the other end of the resistance element 37 and the collector of a phototransistor 26 (described later) of the photocoupler 24, and the source is connected to a node NN.

[0027] With this configuration, the control circuit 35 turns on the transistor 32 when the control signal CTL becomes high level (active level), and turns on the transistor 32 when the phototransistor 26 of the photocoupler 24 receives light from the light-emitting diode 25.

[0028] The DC / DC conversion circuit 41 is configured to generate a power supply voltage VSEC by performing DC / DC conversion based on the DC power of the power supply voltage V1 supplied from the controller 22 of the storage battery control device 20. The power supply voltage VSEC is, for example, 5 V. The DC / DC conversion circuit 41 supplies the generated power supply voltage VSEC to the communication circuit 49 and the isolator 27.

[0029] The transistor 42 is a P-type field effect transistor, with its source connected to a node N1 connected to the output terminal of the DC / DC conversion circuit 41, its gate connected to a node N2, and its drain connected to the resistance element 48. When the transistor 42 is turned on, it causes a current to flow in a current path from the output terminal of the DC / DC conversion circuit 41 through the transistor 42, the resistance element 48, and the light-emitting diode 25 of the photocoupler 24 to the ground node.

[0030] The control circuit 43 is configured to control the operation of the transistor 42 based on the power supply voltage VSEC. The control circuit 43 has resistive elements 44 and 45, a capacitive element 46, and a diode 47. One end of the resistive element 44 is connected to the node N1, and the other end is connected to the node N2. One end of the resistive element 45 is connected to the node N2, and the other end is connected to the node N3. One end of the capacitive element 46 is connected to the node N3, and the other end is grounded. The anode of the diode 47 is connected to the node N3, and the cathode is connected to the node N1.

[0031] With this configuration, when the DC / DC conversion circuit 41 starts up based on the power supply voltage V1 and the power supply voltage VSEC rises, the control circuit 43 turns on the transistor 42 for a predetermined period of time corresponding to the rise.

[0032] One end of the resistor element 48 is connected to the drain of the transistor 42 , and the other end is connected to the anode of a light-emitting diode 25 (described later) of the photocoupler 24 .

[0033] The photocoupler 24 has a light-emitting diode 25 and a phototransistor 26. The anode of the light-emitting diode 25 is connected to the other end of the resistor element 48, and the cathode is grounded. The collector of the phototransistor 26 is connected to the other end of the resistor element 37 and the drain of the transistor 38, and the emitter is connected to a node NN.

[0034] The communication circuit 49 is configured to communicate with the controller 22 (FIG. 1) of the storage battery control device 20. The communication circuit 49 also communicates with the processing circuit 34 via the isolator 27. The communication circuit 49 operates based on the power supply of the power supply voltage VSEC supplied from the DC / DC conversion circuit 41.

[0035] The isolator 27 is configured to transmit a signal from the communication circuit 49 to the processing circuit 34, and to transmit a signal from the processing circuit 34 to the communication circuit 49. The isolator 27 operates based on the power supply power of the power supply voltage VPRI supplied from the DC / DC conversion circuit 33 and the power supply power of the power supply voltage VSEC supplied from the DC / DC conversion circuit 41. That is, the isolator 27 has a circuit portion belonging to the primary side circuit 30 that operates based on the power supply power of the power supply voltage VPRI, and a circuit portion belonging to the secondary side circuit that operates based on the power supply power of the power supply voltage VSEC. In the isolator 27, the circuit portion belonging to the primary side circuit 30 and the circuit portion belonging to the secondary side circuit 40 are DC-isolated from each other.

[0036] Here, the DC / DC conversion circuit 41 corresponds to a specific example of a "first power supply circuit" in an embodiment of the present disclosure. The transistor 42 corresponds to a specific example of a "first switch" in an embodiment of the present disclosure. The photocoupler 24 corresponds to a specific example of a "photocoupler" in an embodiment of the present disclosure. The control circuit 43 corresponds to a specific example of a "first control circuit" in an embodiment of the present disclosure. The storage battery 31 corresponds to a specific example of a "storage battery" in an embodiment of the present disclosure. The DC / DC conversion circuit 33 corresponds to a specific example of a "second power supply circuit" in an embodiment of the present disclosure. The transistor 32 corresponds to a specific example of a "second switch" in an embodiment of the present disclosure. The processing circuit 34 corresponds to a specific example of a "processing circuit" in an embodiment of the present disclosure. The control signal CTL corresponds to a specific example of a "control signal" in an embodiment of the present disclosure. The control circuit 35 corresponds to a specific example of a "processing circuit" in an embodiment of the present disclosure. The resistive element 48 corresponds to a specific example of a "first resistive element" in an embodiment of the present disclosure. The node N1 corresponds to a specific example of a "first node" in an embodiment of the present disclosure. The node N2 corresponds to a specific example of a "second node" in an embodiment of the present disclosure. The node N3 corresponds to a specific example of a "third node" in an embodiment of the present disclosure. The resistive element 44 corresponds to a specific example of a "second resistive element" in an embodiment of the present disclosure. The resistive element 45 corresponds to a specific example of a "third resistive element" in an embodiment of the present disclosure. The capacitive element 46 corresponds to a specific example of a "capacitive element" in an embodiment of the present disclosure. The diode 47 corresponds to a specific example of a "diode" in an embodiment of the present disclosure. The communication circuit 49 corresponds to a specific example of a "communication circuit" in an embodiment of the present disclosure. The isolator 27 corresponds to a specific example of an "isolator" in an embodiment of the present disclosure. The storage battery module 23 corresponds to a specific example of a "storage battery module" in an embodiment of the present disclosure. The storage battery control device 20 corresponds to a specific example of an "external device" and a "storage battery control device" in an embodiment of the present disclosure.

[0037] [Actions and Actions] Next, the operation and function of the power storage system 1 of the present embodiment will be described.

[0038] (Overview of overall operation) First, an overview of the overall operation of the power storage system 1 will be described with reference to FIG. 1. The power conditioner 11 converts AC power supplied from the power grid 9 into DC power by AC / DC conversion, and supplies the converted DC power to the battery system 2 via the breaker 12. The power conditioner 11 also converts DC power supplied from the battery system 2 via the breaker 12 into AC power by DC / AC conversion, and supplies the converted AC power to the load device 8 and the power grid 9. The load device 8 operates based on the AC power supplied from the power grid 9 and the AC power supplied from the power conditioner 11. The breaker 12 is provided in a power supply path between the power conditioner 11 and the battery system 2, and cuts off the power supply when, for example, an overcurrent or a short circuit occurs. The energy control device 13 controls the operation of the power storage system 1 by communicating with the control device 7, which is a higher-level device. The energy control device 13 controls the operation of the power conditioner 11 by communicating with the power conditioner 11, and also controls the operation of the storage battery system 2 by communicating with the storage battery control device 20 of the storage battery system 2.

[0039] In the storage battery system 2, the storage battery control device 20 controls the operation of the storage battery system 2 by controlling charging and discharging of the multiple storage battery modules 23 based on instructions from the energy control device 13. The contactor 21 controls the power supply via the power line PP by turning on or off based on instructions from the controller 22. The controller 22 grasps the operating states of each of the multiple storage battery modules 23 by communicating with the multiple storage battery modules 23, and controls the operation of the storage battery system 2 based on instructions from the energy control device 13. The controller 22 also supplies a power supply voltage V1 to the multiple storage battery modules 23. The storage batteries 31 of the multiple storage battery modules 23 store power.

[0040] (Details of operation) Next, a detailed description will be given of the operation of the storage battery module 23. First, a startup operation of the storage battery module 23 will be described, and then a shutdown operation of the storage battery module 23 will be described.

[0041] At the time of startup, first, the controller 22 of the storage battery control device 20 supplies a power supply voltage V1 to the multiple storage battery modules 23. In the storage battery module 23, the DC / DC conversion circuit 41 generates a power supply voltage VSEC by performing DC / DC conversion based on the direct current power of this power supply voltage V1. The power supply voltage VSEC is generated, for example, by ramping up through DC / DC conversion. The DC / DC conversion circuit 41 supplies this power supply voltage VSEC to the communication circuit 49 and the isolator 27.

[0042] When the power supply voltage VSEC rises, the control circuit 43 turns on the transistor 42 for a predetermined period according to the rise.

[0043] Fig. 3 shows an example of the operation of the control circuit 43. For convenience of explanation, the waveform of the power supply voltage VSEC is depicted as a rectangular waveform in Fig. 3.

[0044] At timing t1, when the power supply voltage VSEC rises, in the control circuit 43, a current flows from the output terminal of the DC / DC conversion circuit 41 through the resistive elements 44 and 45, and the capacitive element 46 starts to be charged. This current makes the gate voltage VG of the transistor 42 lower than the source voltage of the transistor 42. Immediately after the power supply voltage VSEC rises, the gate voltage VG of the transistor 42 is a voltage obtained by dividing the power supply voltage VSEC by the resistive elements 44 and 45. At this time, the gate-source voltage Vgs of the transistor 42 is a voltage that can turn the transistor 42 on. As a result, the transistor 42 is turned on. As time passes, the capacitive element 46 is gradually charged, so that the gate voltage VG of the transistor 42 gradually increases as shown in FIG. 3. In other words, the absolute value of the gate-source voltage Vgs of the transistor 42 gradually decreases. This voltage change is set by the time constants of the resistive elements 44 and 45 and the capacitive element 46.

[0045] When the transistor 42 is turned on at timing t1, a current I25 flows in a current path that leads from the output terminal of the DC / DC conversion circuit 41 to the ground node via the transistor 42, the resistor element 48, and the light-emitting diode 25 of the photocoupler 24. This current I25 is an activation current for the photocoupler 24. The current value of this current I25 is set by the resistance value of the resistor element 48. When the current I25 flows through the light-emitting diode 25 of the photocoupler 24, the light-emitting diode 25 emits light, and the phototransistor 26 receives this light and passes a current from the collector to the emitter.

[0046] As a result of the phototransistor 26 passing a current in this manner, in the primary side circuit 30, a current flows from the positive electrode of the storage battery 31 through the resistor element 36, the resistor element 37, and the phototransistor 26 in this order. As a result, the gate voltage of the transistor 32 becomes lower than the source voltage of the transistor 32. At this time, the gate-source voltage Vgs of the transistor 32 is a voltage that can turn the transistor 32 on. As a result, the transistor 32 turns on and supplies the DC power supplied from the storage battery 31 to the DC / DC conversion circuit 33. The DC / DC conversion circuit 33 generates a power supply voltage VPRI by performing DC / DC conversion based on the DC power supplied from the storage battery 31. The power supply voltage VPRI ramps up, for example, by a DC / DC conversion operation, and reaches a final voltage. The DC / DC conversion circuit 33 supplies this power supply voltage VPRI to the processing circuit 34 and the isolator 27.

[0047] The processing circuit 34 starts up based on this power supply voltage VPRI. After operating in a predetermined startup sequence, the processing circuit 34 changes the control signal CTL from a low level (inactive level) to a high level (active level). This control signal CTL turns the transistor 38 into an ON state. As a result, in the primary side circuit 30, a current flows from the positive electrode of the storage battery 31 through the resistive element 36, the resistive element 37, and the transistor 38 in that order. That is, at this stage, a current flows from the positive electrode of the storage battery 31 through the resistive element 36 and the resistive element 37 to both the phototransistor 26 and the transistor 38 of the photocoupler 24. The gate-source voltage Vgs of the transistor 32 remains at a voltage that can turn the transistor 32 into an ON state. Therefore, the DC / DC conversion circuit 33 continues DC / DC conversion and continues to generate the power supply voltage VPRI.

[0048] 3, at timing t2, the gate voltage VG of the transistor 42 reaches the voltage VTH corresponding to the threshold voltage of the transistor 42. This causes the transistor 42 to change from the on state to the off state. When the transistor 42 turns off, the current I25 stops flowing through the light-emitting diode 25 of the photocoupler 24, and therefore the current stops flowing through the phototransistor 26.

[0049] In the primary side circuit 30, no current flows through the phototransistor 26 in this way, but the control signal CTL remains at a high level, so that a current continues to flow through the transistor 38. That is, a current flows from the positive electrode of the storage battery 31 through the resistor element 36, the resistor element 37, and the transistor 38 in that order. The gate-source voltage Vgs of the transistor 32 remains at a voltage that can turn on the transistor 32. Therefore, the DC / DC conversion circuit 33 continues DC / DC conversion and generates the power supply voltage VPRI.

[0050] Thus, in the storage battery module 23, during the period from timing t1 to t2, the transistor 42 is turned on and an activation current of a one-shot pulse flows. The length of the period from timing t1 to t2 is, for example, about several seconds, and is set by the time constants of the resistive elements 44 and 45 and the capacitive element 46. The timing t2 is set to be later than the timing at which, in the primary side circuit 30, the transistor 32 is turned on, the DC / DC conversion circuit 33 generates the power supply voltage VPRI, the processing circuit 34 starts up, and the transistor 38 is turned on.

[0051] In the secondary side circuit 40, as shown in FIG. 3, the gate voltage VG of the transistor 42 continues to rise thereafter and approaches the power supply voltage VSEC.

[0052] In this manner, the storage battery module 23 is started up. The processing circuit 34 monitors the operating state of the storage battery 31 by monitoring the voltage, current, temperature, and the like of the storage battery 31. The processing circuit 34 then communicates with the controller 22 of the storage battery control device 20 via the isolator 27 and the communication circuit 49, thereby supplying information about the operating state of the storage battery 31 to the controller 22.

[0053] Next, a case where the operation of the storage battery module 23 is stopped will be described. First, the controller 22 of the storage battery control device 20 stops the supply of the power supply voltage V1 to the multiple storage battery modules 23. In the storage battery module 23, the DC / DC conversion circuit 41 stops DC / DC conversion and stops generating the power supply voltage VSEC based on the stop of the supply of the power supply voltage V1. As a result, as shown in FIG. 3, the power supply voltage VSEC falls at timing t3 and becomes 0 V. As a result, the DC / DC conversion circuit 41 stops the supply of the power supply voltage VSEC to the communication circuit 49 and the isolator 27.

[0054] In the control circuit 43, for example, the capacitive element 46 is charged, so the voltage of the node N3 is higher than the voltage of the node N1. This causes the diode 47 to turn on, and a current flows from the capacitive element 46 through the diode 47 to, for example, the communication circuit 49 or the isolator 27. In this way, the capacitive element 46 is quickly discharged. As a result, the gate voltage VG of the transistor 42 quickly drops, as shown in FIG. 3.

[0055] When the power supply voltage VSEC falls, the power supply voltage VSEC is no longer supplied to the isolator 27, so the isolator 27 fixes the signal to the processing circuit 34 at a low level. The processing circuit 34 recognizes that the supply of the power supply voltage V1 from the controller 22 of the storage battery control device 20 has been stopped based on the signal supplied from the isolator 27, and changes the control signal CTL from a high level (active level) to a low level (inactive level). As a result, the transistor 38 is turned off, so that no current flows from the positive electrode of the storage battery 31 to the resistance elements 36 and 37. Therefore, the gate-source voltage Vgs of the transistor 32 becomes approximately 0V, and the transistor 32 is turned off. Since the transistor 32 is turned off, the power supply from the storage battery 31 to the DC / DC conversion circuit 33 is stopped, and the DC / DC conversion circuit 33 stops DC / DC conversion and stops generating the power supply voltage VPRI. As a result, the power supply voltage VPRI falls. As a result, the DC / DC conversion circuit 33 stops supplying the power supply voltage VPRI to the processing circuit 34 and the isolator 27.

[0056] In this way, the storage battery module 23 stops operating. In the control circuit 43 of the secondary side circuit 40, the capacitance element 46 is discharged by the diode 47. Therefore, for example, in FIG. 3, when the supply of the power supply voltage V1 from the controller 22 of the storage battery control device 20 is resumed immediately after timing t3, the storage battery module 23 can be started up. In other words, the controller 22 of the storage battery control device 20 can quickly restart (fast reset) the storage battery module 23 by stopping the supply of the power supply voltage V1 for only a short time.

[0057] Thus, the storage battery module 23 includes a first power supply circuit (DC / DC conversion circuit 41) capable of operating based on power supplied from the controller 22 of the storage battery control device 20, a first switch (transistor 42) provided in a current path connecting the output terminal of the first power supply circuit and a ground node, a photocoupler 24 having a light-emitting diode 25 and a phototransistor 26 provided in the current path, and a first control circuit (control circuit 43) capable of turning on the first switch (transistor 42) for a predetermined period according to the rise of the power supply voltage VSEC generated by the first power supply circuit (DC / DC conversion circuit 41); The power supply circuit includes a storage battery 31, a second power supply circuit (DC / DC conversion circuit 33) that can operate based on the power supplied from the storage battery 31, a second switch (transistor 32) provided in a power supply path connecting the storage battery 31 and an input terminal of the second power supply circuit (DC / DC conversion circuit 33), a processing circuit 34 that can operate based on the power supplied from the second power supply circuit (DC / DC conversion circuit 33) and can monitor the operating state of the storage battery 31, and a second control circuit (control circuit 35) that can turn on the second switch (transistor 32) based on the light reception result of the phototransistor 26 and an instruction from the processing circuit 34. This allows the control circuit 43 to turn on the transistor 42 for a predetermined period of time, and to pass a current that is a one-shot pulse to the photocoupler 24. This control circuit 43 can set the pulse width of this one-shot pulse. This control circuit 43 is provided in a part separate from the current path, so that it can be prevented from affecting the current value of the activation current of the photocoupler 24. As a result, the storage battery module 23 can have a high degree of freedom in design.

[0058] That is, for example, in the technology described in Patent Document 1, a light-emitting diode, a resistive element, and a capacitive element are provided in the current path of the activation current. Therefore, the pulse width of the one-shot pulse is set by the time constant of the resistive element and the capacitive element, and the current value of the activation current is set by the resistance value of the resistive element. The current value of this activation current also changes depending on the charge amount in the capacitive element. Therefore, it is difficult to freely set the pulse width of the one-shot pulse and the current value of the activation current. Specifically, for example, if one tries to increase the time constant, it is necessary to increase the resistance value and the capacitance value, but if the resistance value is increased, the current value of the activation current will become smaller. Therefore, it is difficult to increase the time constant.

[0059] On the other hand, in the storage battery module 23, the control circuit 43 is provided and the resistive element 48 is provided in the current path of the activation current, so that the pulse width of the one-shot pulse and the current value of the activation current can be set separately. As a result, the storage battery module 23 can have a high degree of freedom in design.

[0060] Furthermore, in the storage battery module 23, the photocoupler 24 is turned on only for a period of time that corresponds to the timing at which the first power supply circuit (DC / DC conversion circuit 41) is started up. This shortens the operating time of the photocoupler 24, thereby extending the circuit life and reducing current consumption.

[0061] Further, the storage battery module 23 is provided with a photocoupler 24. This allows the storage battery module 23 to reduce power consumption, for example, when the storage battery module 23 is removed from the storage battery system 2 and stored. That is, for example, when the photocoupler 24 is not provided and all signals are exchanged via the isolator 27, the DC / DC conversion circuit 33 needs to continue to operate. If the transistor 32 is turned off and the DC / DC conversion circuit 33 stops operating, the supply of the power supply voltage VPRI to the isolator 27 stops, and the secondary side circuit 40 cannot turn the transistor 32 on. In this way, if the DC / DC conversion circuit 33 continues to operate, power consumption increases. Since the storage battery module 23 is provided with the photocoupler 24, the operation of the DC / DC conversion circuit 33 can be stopped by turning off the transistor 32, and the secondary side circuit 40 can turn on the transistor 32 via the photocoupler 24, thereby starting up the DC / DC conversion circuit 33. This allows the storage battery module 23 to reduce power consumption, for example, when the storage battery module 23 is removed from the storage battery system 2 and stored.

[0062] In addition, in the storage battery module 23, the processing circuit 34 can operate based on the power supplied from the second power supply circuit (DC / DC conversion circuit 33), and can activate the control signal CTL after startup. The second control circuit (control circuit 35) can turn on the transistor 32 during the period when the phototransistor 26 detects light, and can turn on the transistor 32 during the period when the control signal CTL is active. As a result, for example, during the period when an activation current flows through the photocoupler 24 and the phototransistor 26 detects light, the control circuit 35 can turn on the transistor 32. Then, the processing circuit 34 starts up, the processing circuit 34 activates the control signal CTL, and the control circuit 35 can maintain the transistor 32 in the on state. As a result, the activation current of the photocoupler 24 can be stopped thereafter, and the operation time of the photocoupler 24 can be shortened. As a result, the circuit life can be extended and the current consumption can be reduced.

[0063] The storage battery module 23 further includes a first resistor element (resistance element 48) having one end and the other end connected to the anode of the light-emitting diode 25. The output terminal of the first power supply circuit (DC / DC conversion circuit 41) is connected to a first node (node ​​N1). The first switch (transistor 42) has a first terminal connected to the first node (node ​​N1), a second terminal connected to one end of the first resistor element (resistance element 48), and a control terminal connected to a second node (node ​​N2). The first control circuit (control circuit 43) has a second resistor element (resistance element 44) having one end connected to the first node (node ​​N1) and the other end connected to the second node (node ​​N2), and a capacitance element 46 having one end led to the second node (node ​​N2) and the other end connected to a ground node. This allows the control circuit 43 to set the pulse width of the one-shot pulse, and the resistance element 48 to set the current value of the activation current, thereby increasing the degree of freedom in design.

[0064] Moreover, in the storage battery module 23, the first control circuit (control circuit 43) has a diode 47 having an anode connected to one end of the capacitance element 46 and a cathode connected to the first node (node ​​N1). This allows the capacitance element 46 to be quickly discharged when, for example, the operation of the DC / DC conversion circuit 41 stops. Therefore, the storage battery module 23 can quickly perform a restart (fast reset), for example.

[0065] [effect] As described above, in this embodiment, the battery control device includes a first power supply circuit that can operate based on the power supplied from the controller of the battery control device, a first switch provided in a current path connecting the output terminal of the first power supply circuit and a ground node, a photocoupler having a light-emitting diode and a phototransistor provided in the current path, a first control circuit that can turn on the first switch for a predetermined period according to the rise of the power supply voltage based on the power supply voltage generated by the first power supply circuit, a storage battery, a second power supply circuit that can operate based on the power supplied from the storage battery, a second switch provided in a power supply path connecting the storage battery and the input terminal of the second power supply circuit, a processing circuit that can operate based on the power supplied from the second power supply circuit and can monitor the operating state of the storage battery, and a second control circuit that can turn on the second switch based on the light receiving result of the light receiving element and an instruction from the processing circuit. This allows for increased freedom in design.

[0066] In this embodiment, the photocoupler is turned on for a period of time that corresponds to the timing at which the first power supply circuit is started up. This shortens the operating time of the photocoupler, thereby extending the circuit life and reducing current consumption.

[0067] In this embodiment, a photocoupler is provided, which makes it possible to reduce power consumption, for example, when the storage battery module is removed from the storage battery system and stored.

[0068] In this embodiment, the processing circuit can operate based on the power supplied from the second power supply circuit, and can activate the control signal after startup. The second control circuit can turn on the transistor during the period when the phototransistor detects light, and can turn on the transistor during the period when the control signal is active. This can extend the circuit life and reduce current consumption.

[0069] In this embodiment, the power supply circuit further includes a first resistor element having one end and the other end connected to the anode of the light-emitting diode. The output terminal of the first power supply circuit is connected to the first node. The first switch has a first terminal connected to the first node, a second terminal connected to one end of the first resistor element, and a control terminal connected to the second node. The first control circuit has a second resistor element having one end connected to the first node and the other end connected to the second node, and a capacitive element having one end led to the second node and the other end connected to the ground node. This allows for increased freedom in design.

[0070] In this embodiment, the first control circuit has a diode having an anode connected to one end of the capacitance element and a cathode connected to the first node, which allows the capacitance element to be quickly discharged, and therefore allows, for example, a quick restart (fast reset) to be performed.

[0071] [Variation 1] In the above-described embodiment, the control circuit 43 is provided with the resistive element 45 as shown in FIG. 2, but the present invention is not limited to this. Alternatively, the resistive element 45 may not be provided as in the storage battery module 29A shown in FIG. 4. The storage battery module 29A has a control circuit 43A. The control circuit 43A has a resistive element 44, a capacitive element 46, and a diode 47. One end of the capacitive element 46 is connected to the node N2, and the other end is connected to the ground node. The anode of the diode 47 is connected to the node N2, and the cathode is connected to the node N1. In this case, the control circuit 43A can set the pulse width of the one-shot pulse by the time constants of the resistive element 44 and the capacitive element 46.

[0072] <2. Second embodiment> Next, a power storage system according to a second embodiment will be described. In this embodiment, the configuration of the control circuit of the secondary side circuit in the storage battery module is different from that of the first embodiment. Note that the same reference numerals are used to designate components that are substantially the same as those in the power storage system 1 according to the first embodiment, and descriptions thereof will be omitted as appropriate.

[0073] The power storage system according to the second embodiment includes a storage battery system, similar to the power storage system 1 (FIG. 1) according to the first embodiment. This storage battery system includes a plurality of storage battery modules 53, similar to the first embodiment.

[0074] 5 shows an example of the configuration of the storage battery module 53. The storage battery module 53 has a control circuit 63. The DC / DC conversion circuit 41, the transistor 42, the control circuit 63, the resistive element 48, the light-emitting diode 25 of the photocoupler 24, the communication circuit 49, and a part of the isolator 27 configure the secondary side circuit 40 of the storage battery module 23.

[0075] In this example, the control circuit 63 has a delay circuit 64. The delay circuit 64 is configured to delay the signal of the power supply voltage VSEC generated by the DC / DC conversion circuit 41 by a predetermined time Td. The length of this predetermined time Td is, for example, about several seconds. The control circuit 63 operates based on the DC power of the power supply voltage VSEC supplied from the DC / DC conversion circuit 41.

[0076] Here, the control circuit 63 corresponds to a specific example of a "first control circuit" in an embodiment of the present disclosure. The delay circuit 64 corresponds to a specific example of a "delay circuit" in an embodiment of the present disclosure. The predetermined time Td corresponds to a specific example of a "predetermined time" in an embodiment of the present disclosure.

[0077] At startup, first, the controller 22 of the storage battery control device 20 supplies a power supply voltage V1 to the multiple storage battery modules 53. In the storage battery module 53, the DC / DC conversion circuit 41 generates a power supply voltage VSEC by performing DC / DC conversion based on the DC power of this power supply voltage V1. The DC / DC conversion circuit 41 supplies this power supply voltage VSEC to the delay circuit 64, the communication circuit 49, and the isolator 27.

[0078] When the power supply voltage VSEC rises, the control circuit 63 turns on the transistor 42 for a predetermined period according to the rise.

[0079] FIG. 6 shows an example of the operation of the control circuit 63. In FIG.

[0080] When the power supply voltage VSEC rises at timing t11, the control circuit 63 supplies power to the delay circuit 64, and the delay circuit 64 starts operating. The signal of the power supply voltage VSEC is delayed by a predetermined time Td to generate a signal of the gate voltage VG of the transistor 42. As a result, the gate voltage VG rises at timing t12, which is delayed by the predetermined time Td from timing t11. During the period from timing t11 to t12, the gate voltage VG of the transistor 42 is lower than the source voltage of the transistor 42. The gate-source voltage Vgs of the transistor 42 at this time is a voltage that can turn the transistor 42 on. As a result, the transistor 42 turns on.

[0081] When the transistor 42 is turned on at timing t11, a current I25 flows in a current path that leads from the output terminal of the DC / DC conversion circuit 41 to the ground node via the transistor 42, the resistor element 48, and the light-emitting diode 25 of the photocoupler 24. The current value of this current I25 is set by the resistance value of the resistor element 48. When the current I25 flows through the light-emitting diode 25 of the photocoupler 24, the light-emitting diode 25 emits light, and the phototransistor 26 receives this light and passes a current from the collector to the emitter.

[0082] As a result of the phototransistor 26 passing a current in this manner, in the primary side circuit 30, a current flows from the positive electrode of the storage battery 31 through the resistor element 36, the resistor element 37, and the phototransistor 26 in this order. As a result, the gate voltage of the transistor 32 becomes lower than the source voltage of the transistor 32. At this time, the gate-source voltage Vgs of the transistor 32 is a voltage that can turn the transistor 32 on. As a result, the transistor 32 turns on and supplies the DC power supplied from the storage battery 31 to the DC / DC conversion circuit 33. The DC / DC conversion circuit 33 generates a power supply voltage VPRI by performing DC / DC conversion based on the DC power supplied from the storage battery 31. The power supply voltage VPRI ramps up, for example, by a DC / DC conversion operation, and reaches a final voltage. The DC / DC conversion circuit 33 supplies this power supply voltage VPRI to the processing circuit 34 and the isolator 27.

[0083] The processing circuit 34 starts up based on this power supply voltage VPRI. After operating in a predetermined startup sequence, the processing circuit 34 changes the control signal CTL from a low level (inactive level) to a high level (active level). This control signal CTL turns the transistor 38 into an ON state. As a result, in the primary side circuit 30, a current flows from the positive electrode of the storage battery 31 through the resistive element 36, the resistive element 37, and the transistor 38 in that order. That is, at this stage, a current flows from the positive electrode of the storage battery 31 through the resistive element 36 and the resistive element 37 to both the phototransistor 26 and the transistor 38 of the photocoupler 24. The gate-source voltage Vgs of the transistor 32 remains at a voltage that can turn the transistor 32 into an ON state. Therefore, the DC / DC conversion circuit 33 continues DC / DC conversion and continues to generate the power supply voltage VPRI.

[0084] 6, at timing t12, the gate voltage VG of the transistor 42 rises. This causes the transistor 42 to change from the on state to the off state. When the transistor 42 turns off, the current I25 stops flowing through the light-emitting diode 25 of the photocoupler 24, and therefore the current stops flowing through the phototransistor 26.

[0085] In this way, in the primary side circuit 30, no current flows through the phototransistor 26, but because the control signal CTL remains at a high level, a current continues to flow through the transistor 38. The gate-source voltage Vgs of the transistor 32 remains at a voltage that can turn on the transistor 32. Therefore, the DC / DC conversion circuit 33 continues DC / DC conversion and generates the power supply voltage VPRI.

[0086] Thus, in the storage battery module 53, during the period from timing t11 to t12, the transistor 42 is turned on and an activation current of a one-shot pulse flows. The length of the period from timing t11 to t12 is, for example, about several seconds, and is set by the delay time Td in the delay circuit 64. The timing t12 is set to be later than the timing at which, in the primary side circuit 30, the transistor 32 is turned on, the DC / DC conversion circuit 33 generates the power supply voltage VPRI, the processing circuit 34 starts up, and the transistor 38 is turned on.

[0087] In this manner, the storage battery module 53 starts up.

[0088] Next, a case where the operation of the storage battery module 53 is stopped will be described. First, the controller 22 of the storage battery control device 20 stops the supply of the power supply voltage V1 to the multiple storage battery modules 53. In the storage battery module 53, the DC / DC conversion circuit 41 stops DC / DC conversion and stops generating the power supply voltage VSEC based on the stop of the supply of the power supply voltage V1. As a result, as shown in FIG. 6, the power supply voltage VSEC falls at timing t13 and becomes 0 V. As a result, the DC / DC conversion circuit 41 stops the supply of the power supply voltage VSEC to the delay circuit 64, the communication circuit 49, and the isolator 27.

[0089] In the control circuit 63, the power supply to the delay circuit 64 is stopped, so that the delay circuit 64 causes the gate voltage VG of the transistor 42 to fall.

[0090] When the power supply voltage VSEC falls, the power supply voltage VSEC is no longer supplied to the isolator 27, so the isolator 27 fixes the signal to the processing circuit 34 at a low level. The processing circuit 34 recognizes that the supply of the power supply voltage V1 from the controller 22 of the storage battery control device 20 has been stopped based on the signal supplied from the isolator 27, and changes the control signal CTL from a high level (active level) to a low level (inactive level). As a result, the transistor 38 is turned off, so that no current flows from the positive electrode of the storage battery 31 to the resistance elements 36 and 37. Therefore, the gate-source voltage Vgs of the transistor 32 becomes approximately 0V, and the transistor 32 is turned off. Since the transistor 32 is turned off, the power supply from the storage battery 31 to the DC / DC conversion circuit 33 is stopped, and the DC / DC conversion circuit 33 stops DC / DC conversion and stops generating the power supply voltage VPRI. As a result, the power supply voltage VPRI falls. As a result, the DC / DC conversion circuit 33 stops supplying the power supply voltage VPRI to the processing circuit 34 and the isolator 27.

[0091] In this manner, the storage battery module 53 stops operating. For example, in Fig. 6, if the supply of the power supply voltage V1 from the controller 22 of the storage battery control device 20 is resumed immediately after timing t13, the storage battery module 53 can be started up. In other words, the controller 22 of the storage battery control device 20 can quickly restart (fast reset) the storage battery module 53 by stopping the supply of the power supply voltage V1 for only a short period of time.

[0092] The storage battery module 53 further includes a first resistor element (resistance element 48) having one end and the other end connected to the anode of the light-emitting diode 25. The output terminal of the first power supply circuit (DC / DC conversion circuit 41) is connected to a first node (node ​​N1). The first switch (transistor 42) has a first terminal connected to the first node (node ​​N1), a second terminal connected to one end of the first resistor element (resistance element 48), and a control terminal connected to the second node (node ​​N2). The first control circuit (control circuit 63) has a delay circuit 64 capable of generating a second signal by delaying a first signal indicated by the power supply voltage VSEC by a predetermined time Td, and is capable of turning on the first switch (transistor 42) when the logical level of the first signal is high and the logical level of the second signal is low. This allows the control circuit 63 to set the pulse width of the one-shot pulse, and the resistance element 48 to set the current value of the activation current, thereby increasing the degree of freedom in design.

[0093] As described above, in this embodiment, the first resistor element having one end and the other end connected to the anode of the light-emitting diode is further provided. The output terminal of the first power supply circuit is connected to the first node. The first switch has a first terminal connected to the first node, a second terminal connected to one end of the first resistor element, and a control terminal connected to the second node. The first control circuit has a delay circuit capable of generating a second signal by delaying a first signal indicated by the power supply voltage by a predetermined time, and is capable of turning on the first switch when the logical level of the first signal is high and the logical level of the second signal is low. This can increase the degree of freedom in design. Other effects are the same as those of the first embodiment.

[0094] [Variation 2] In the above embodiment, as shown in Fig. 5, the P-type transistor 42 is used in the control circuit 63, but the present invention is not limited to this and may be any transistor that can be turned on and off. For example, in this example, a P-type transistor 42 is provided and turned on by supplying a low-level control voltage to the gate, but instead, a switch of reverse polarity may be provided and turned on by supplying a high-level control voltage to the control terminal of the switch. In this case, an inverter can be provided at the output of the delay circuit 64 and the output signal of the inverter can be supplied to the control terminal of the switch.

[0095] Although the present technology has been described above with reference to the embodiments, the present technology is not limited to these embodiments and various modifications are possible.

[0096] For example, in the above-mentioned embodiment and the like, as shown in FIG. 1, one storage battery system 2 is provided in the power storage system 1, but the present invention is not limited to this. Instead of this, for example, a plurality of storage battery systems may be provided as in a power storage system 1B shown in FIG. 7. This power storage system 1B is obtained by applying this modification to the power storage system 1 according to the above-mentioned first embodiment. The power storage system 1B includes a hub device 14B and a plurality of (two in this example) storage battery systems 2. The hub device 14B is provided between the breaker 12 and the energy control device 13, and the two storage battery systems 2. The energy control device 13 controls the operation of the storage battery system 2 by communicating with the storage battery control devices 20 of the two storage battery systems 2 via the hub device 14B.

[0097] In the example of Figure 7, the controller 22 supplies the power supply voltage V1 to the multiple storage battery modules 23, but this is not limited to this. Instead, for example, the energy control device 13 may supply the power supply voltage V1 to the multiple storage battery modules 23, or the hub device 14B may supply the power supply voltage V1 to the multiple storage battery modules 23.

[0098] It should be noted that the effects described in this specification are merely examples and are not limiting, and other effects may also be obtained.

Claims

1. A first power supply circuit capable of operating based on power supplied from an external device; a first switch provided in a current path connecting an output terminal of the first power supply circuit and a ground node; a photocoupler having a light emitting element and a light receiving element provided in the current path; a first control circuit capable of turning on the first switch during a period corresponding to a rise in a power supply voltage generated by the first power supply circuit; A storage battery capable of storing electricity; a second power supply circuit operable based on power supplied from the storage battery; a second switch provided in a power supply path connecting the storage battery and an input terminal of the second power supply circuit; a processing circuit capable of operating based on power supplied from the second power supply circuit and capable of monitoring an operating state of the storage battery; a second control circuit capable of turning on the second switch based on a light receiving result of the light receiving element and an instruction from the processing circuit; A storage battery module comprising:

2. The processing circuit is operable based on power supplied from the second power supply circuit, and is capable of activating a control signal after startup; The second control circuit is capable of turning on the second switch during a period in which the light receiving element detects light, and is capable of turning on the second switch during a period in which the control signal is active. The battery module according to claim 1 .

3. a first resistor element having one end and the other end connected to an anode of the light emitting element; an output terminal of the first power supply circuit is connected to a first node; the first switch has a first terminal connected to the first node, a second terminal connected to the one end of the first resistance element, and a control terminal connected to the second node; The first control circuit includes: a second resistive element having one end connected to the first node and the other end connected to the second node; a capacitance element having one end connected to the second node and the other end connected to the ground node; have The storage battery module according to claim 1 or 2.

4. the first control circuit further includes a third resistive element having one end connected to the second node and the other end connected to a third node; The one end of the capacitive element is connected to the third node. The battery module according to claim 3 .

5. The first control circuit further includes a diode having an anode connected to the one end of the capacitance element and a cathode connected to the first node. The battery module according to claim 3 .

6. a first resistor element having one end and the other end connected to an anode of the light emitting element; an output terminal of the first power supply circuit is connected to a first node; the first switch has a first terminal connected to the first node, a second terminal connected to the one end of the first resistance element, and a control terminal connected to the second node; The first control circuit has a delay circuit capable of generating a second signal by delaying a first signal indicated by the power supply voltage by a predetermined time, and is capable of turning on the first switch when the logic level of the first signal is high and the logic level of the second signal is low. The storage battery module according to claim 1 or 2.

7. a communication circuit capable of operating based on power supplied from the first power supply circuit and capable of communicating with the external device; The processing circuitry is capable of transmitting signals to and from the communication circuitry. The battery module according to claim 1 .

8. an isolator operable based on power supplied from the first power supply circuit and power supplied from the second power supply circuit; The processing circuit is capable of transmitting and receiving signals to and from the communication circuit via the isolator. The battery module according to claim 7.

9. The processing circuit is capable of deactivating a control signal based on a signal from the isolator when the supply of power from the external device to the first power supply circuit is stopped; The second control circuit is capable of turning off the second switch based on the control signal. The battery module according to claim 8.

10. Multiple battery modules a battery control device capable of controlling the operation of the plurality of battery modules; Equipped with Each of the plurality of storage battery modules is A first power supply circuit capable of operating based on power supplied from the storage battery control device; a first switch provided in a current path connecting an output terminal of the first power supply circuit and a ground node; a photocoupler having a light emitting element and a light receiving element provided in the current path; a first control circuit capable of turning on the first switch during a period corresponding to a rise in a power supply voltage generated by the first power supply circuit; A storage battery capable of storing electricity; a second power supply circuit operable based on power supplied from the storage battery; a second switch provided in a power supply path connecting the storage battery and an input terminal of the second power supply circuit; a processing circuit capable of operating based on power supplied from the second power supply circuit and capable of monitoring a state of the storage battery; a second control circuit capable of turning on the second switch based on a light receiving result of the light receiving element and an instruction from the processing circuit; have Battery storage system.

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