WO2023176129A1

WO2023176129A1 - Storage battery module and storage battery system

Info

Publication number: WO2023176129A1
Application number: PCT/JP2023/001196
Authority: WO
Inventors: チンマイバガト
Original assignee: 株式会社村田製作所
Priority date: 2022-03-16
Filing date: 2023-01-17
Publication date: 2023-09-21

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

Storage battery modules and storage battery systems

The present disclosure relates to a storage battery module and a storage battery system including a storage battery.

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 via a photocoupler in two circuits that are electrically insulated from each other. This photocoupler transmits a signal for a period of time corresponding 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 resistance element.

Japanese Patent Application Publication No. 9-153779

A storage battery module includes, for example, a primary side circuit that includes a storage battery, and a secondary side circuit that exchanges signals with the outside. These circuits are, for example, galvanically isolated from each other. Control signals are exchanged between these two circuits. It is desired that such a circuit has a high degree of freedom in design, and an improvement in the degree of freedom in design is expected.

It is desirable to provide a storage battery module and a storage battery system that can increase the degree of freedom in design.

A storage battery module in 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, and 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 the output terminal of the first power supply circuit and the ground node. A photocoupler has a light emitting element and a light receiving element provided in a current path. The first control circuit is capable of turning on the first switch during a period corresponding to the rise of the power supply voltage generated by the first power supply circuit. A storage battery is something that can store electric 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 the input terminal of the second power supply circuit. The processing circuit can operate based on the power supplied from the second power supply circuit, and can monitor the operating state of the storage battery. The second control circuit is capable of turning on the second switch based on the light reception result of the light receiving element and an instruction from the processing circuit.

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 that can control operations 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, and 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 the output terminal of the first power supply circuit and the ground node. A photocoupler has a light emitting element and a light receiving element provided in a current path. The first control circuit is capable of turning on the first switch during a period corresponding to the rise of the power supply voltage generated by the first power supply circuit. A storage battery is something that can store electric 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 the input terminal of the second power supply circuit. The processing circuit can operate based on the power supplied from the second power supply circuit, and can monitor the operating state of the storage battery. The second control circuit is capable of turning on the second switch based on the light reception result of the light receiving element and an instruction from the processing circuit.

According to the storage battery module and storage battery system in one embodiment of the present disclosure, the degree of freedom in design can be increased.

FIG. 1 is a block diagram illustrating a configuration example of a power storage system including a storage battery system according to an embodiment of the present disclosure. FIG. 2 is a circuit diagram showing a configuration example of the storage battery module according to the first embodiment. FIG. 3 is a timing waveform diagram showing an example of the operation of the control circuit in the secondary side circuit shown in FIG. FIG. 4 is a circuit diagram showing a configuration example of a storage battery module according to a modification of the first embodiment. FIG. 5 is a circuit diagram showing a configuration example of a storage battery module according to the second embodiment. FIG. 6 is a timing waveform diagram showing an example of the operation of the control circuit in the secondary side circuit shown in FIG. FIG. 7 is a block diagram illustrating a configuration example of a power storage system according to a modification.

Embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the explanation will be given in the following order.
1. First embodiment 2. Second embodiment

<1. First embodiment>
[Configuration example]
FIG. 1 shows a configuration example 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 a 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 route is shown by a thick line.

The power conditioner 11 is configured to convert AC power supplied from the grid power supply 9 into DC power through AC/DC conversion, and supply the converted DC power to the storage battery system 2 via the breaker 12. Ru. In addition, the power conditioner 11 converts the 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 grid power source 9. supply. The power conditioner 11 is connected to the storage battery system 2 via a positive power line PP and a negative power line PN.

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

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 host 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 storage battery by communicating with the storage battery control device 20 (described later) of the storage battery system 2. The operation of the system 2 is controlled.

The storage battery system 2 charges a storage battery based on DC power supplied from the power conditioner 11 via the breaker 12, or supplies the power charged in the storage battery to the power conditioner 11 via the breaker 12. It is composed of The storage battery system 2 includes a storage battery control device 20 and a plurality of storage battery modules 23.

The storage battery control device 20 is a so-called BMU (Battery Management Unit), and controls the operation of the storage battery system 2 by controlling charging and discharging of a plurality of storage battery modules 23 based on instructions from the energy control device 13. It is composed of The storage battery control device 20 includes a contactor 21 and a controller 22.

The contactor 21 is provided on the power line PP and is configured to control power supply via the power line PP by turning on or off based on instructions from the controller 22.

The controller 22 communicates with the plurality of storage battery modules 23 to grasp the operating state of each of the plurality of storage battery modules 23, and controls the operation of the storage battery system 2 based on instructions from the energy control device 13. It is composed of Further, the controller 22 supplies the power supply voltage V1 to the plurality of storage battery modules 23. The power supply voltage V1 is, for example, 24V. The communication connection between the controller 22 and the plurality of storage battery modules 23 may be, for example, a daisy chain connection. In this example, the controller 22 supplies the power supply voltage V1 to the plurality of storage battery modules 23, but the invention is not limited to this. Instead, for example, the energy control device 13 supplies the power supply voltage V1 to the plurality of storage battery modules 23. The power supply voltage V1 may be supplied to the storage battery module 23.

Each of the plurality of 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 includes eight storage battery modules 23 (storage battery modules 23A to 23H). In this example,

storage battery modules

23A and 23B are connected in parallel to each other, storage battery modules 23C and 23D are connected to each other in parallel,

storage battery modules

23E and 23F are connected to each other in parallel, and

storage battery modules

23G and 23H are connected to each other in parallel. be done.

Storage battery modules

23A, 23B, storage battery modules 23C, 23D,

storage battery modules

23E, 23F, and

storage battery modules

23G, 23H are connected in series in this order. The positive terminals TP of the

storage battery modules

23A, 23B are connected to the power line PP, and the negative terminals TN of the

storage battery modules

23G, 23H are connected to the power line PN.

FIG. 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, and a transistor 42. , a control circuit 43 , a resistance 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, the phototransistor 26 (described later) of the photocoupler 24, and a part of the isolator 27 constitute the primary side circuit 30 of the storage battery module 23. do. A portion of the DC/DC conversion circuit 41, the transistor 42, the control circuit 43, the resistive element 48, the light emitting diode 25 (described later) of the photocoupler 24, the communication circuit 49, and the isolator 27 are connected to the secondary circuit 40 of the storage battery module 23. Configure.

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

The transistor 32 is a P-type field effect transistor, and has 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. When the transistor 32 is turned on, it supplies the DC power supplied from the storage battery 31 to the DC/DC conversion circuit 33.

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

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 to supply information about the operating state of the storage battery 31 to the controller 22. It has become.

This processing circuit 34 operates based on the power supply voltage VPRI supplied from the DC/DC conversion circuit 33. Further, the processing circuit 34 controls the operation of the transistor 38 by supplying a control signal CTL to the transistor 38 (described later) of the control circuit 35. Specifically, the processing circuit 34 turns on the transistor 38 by setting the control signal CTL to a high level (active level) after being started by being supplied with the power supply voltage VPRI, for example. Furthermore, when the supply of the power supply voltage V1 to the DC/DC conversion circuit 41 is stopped, the processing circuit 34 sets the control signal CTL to a low level (inactive level) based on the signal from the isolator 27. This turns off the transistor 38.

The control circuit 35 is configured to control the operation of the transistor 32 based on the control signal CTL from the processing circuit 34 and the signal from the photocoupler 24. Control circuit 35 includes

resistance elements

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

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. The transistor 32 is turned on.

The DC/DC conversion circuit 41 is configured to generate the 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, 5V. Then, the DC/DC conversion circuit 41 supplies the generated power supply voltage VSEC to the communication circuit 49 and the isolator 27.

The transistor 42 is a P-type field effect transistor, and has a source connected to a node N1 connected to the output terminal of the DC/DC conversion circuit 41, a gate connected to a node N2, and a drain connected to the resistive element 48. Ru. When the transistor 42 is turned on, current flows from the output terminal of the DC/DC conversion circuit 41 through the transistor 42, the resistive element 48, and the light emitting diode 25 of the photocoupler 24 to the ground node. It looks like this.

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 includes

resistive elements

44 and 45, a capacitive element 46, and a diode 47. One end of resistance element 44 is connected to node N1, and the other end is connected to node N2. One end of resistance element 45 is connected to node N2, and the other end is connected to node N3. One end of capacitive element 46 is connected to node N3, and the other end is grounded. The anode of diode 47 is connected to node N3, and the cathode is connected to node N1.

With this configuration, the control circuit 43 turns on the transistor 42 for a predetermined period corresponding to the rise of the power supply voltage VSEC when the DC/DC conversion circuit 41 is activated based on the power supply voltage V1. It is supposed to be in a state.

One end of the resistive 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.

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 resistance element 48, and the cathode is grounded. The collector of phototransistor 26 is connected to the other end of resistance element 37 and the drain of transistor 38, and the emitter is connected to node NN.

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

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 voltage VPRI supplied from the DC/DC conversion circuit 33 and the power supply voltage VSEC supplied from the DC/DC conversion circuit 41. That is, the isolator 27 has a circuit part that operates based on the power supply voltage VPRI and belongs to the primary side circuit 30, and a circuit part that operates based on the power supply voltage VSEC and belongs to the secondary side circuit. has. In the isolator 27, a circuit portion belonging to the primary circuit 30 and a circuit portion belonging to the secondary circuit 40 are electrically insulated from each other.

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. Resistance element 48 corresponds to a specific example of a "first resistance element" in an embodiment of the present disclosure. Node N1 corresponds to a specific example of a "first node" in an embodiment of the present disclosure. Node N2 corresponds to a specific example of a "second node" in an embodiment of the present disclosure. Node N3 corresponds to a specific example of a "third node" in an embodiment of the present disclosure. The resistance element 44 corresponds to a specific example of a "second resistance element" in an embodiment of the present disclosure. Resistance element 45 corresponds to a specific example of a "third resistance 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.

[Operation and effect]
Next, the operation and effects of the power storage system 1 of this embodiment will be explained.

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

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 plurality of storage battery modules 23 based on instructions from the energy control device 13. The contactor 21 controls power supply via the power line PP by turning on or off based on instructions from the controller 22. The controller 22 communicates with the plurality of storage battery modules 23 to grasp the operating state of each of the plurality of storage battery modules 23 and controls the operation of the storage battery system 2 based on instructions from the energy control device 13. Further, the controller 22 supplies the power supply voltage V1 to the plurality of storage battery modules 23. The storage batteries 31 of the plurality of storage battery modules 23 store electric power.

(Detailed operation)
Next, the operation of the storage battery module 23 will be explained in detail. First, the starting operation of the storage battery module 23 will be explained, and then the operation of stopping the storage battery module 23 will be explained.

At startup, first, the controller 22 of the storage battery control device 20 supplies the power supply voltage V1 to the plurality of storage battery modules 23. In the storage battery module 23, the DC/DC conversion circuit 41 generates the power supply voltage VSEC by performing DC/DC conversion based on the DC power of the power supply voltage V1. The power supply voltage VSEC is generated, for example, by being ramped up by DC/DC conversion. DC/DC conversion circuit 41 supplies this power supply voltage VSEC to communication circuit 49 and isolator 27 .

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

FIG. 3 shows an example of the operation of the control circuit 43. In FIG. 3, for convenience of explanation, the waveform of the power supply voltage VSEC is depicted as a rectangular waveform.

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 resistance element 44 and the resistance element 45, and starts charging the capacitance element 46. This current causes the gate voltage VG of transistor 42 to be lower than the source voltage of 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

resistance elements

44 and 45. The gate-source voltage Vgs of the transistor 42 at this time is a voltage that can turn the transistor 42 on. This turns the transistor 42 on. Since the capacitive element 46 is gradually charged over time, 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.

When the transistor 42 turns on at timing t1, a current I25 flows in a current path from the output terminal of the DC/DC conversion circuit 41 to the ground node via the transistor 42, the resistive element 48, and the light emitting diode 25 of the photocoupler 24. flows. 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 resistance 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 causes a current to flow from the collector to the emitter.

As the phototransistor 26 causes current to flow in this manner, in the primary side circuit 30, the current flows from the positive electrode of the storage battery 31 to the resistance element 36, the resistance element 37, and the phototransistor 26 in this order. As a result, the gate voltage of transistor 32 becomes lower than the source voltage of transistor 32. The gate-source voltage Vgs of the transistor 32 at this time is a voltage that can turn the transistor 32 on. As a result, the transistor 32 is turned on, and the DC power supplied from the storage battery 31 is supplied 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 by, for example, a DC/DC conversion operation and reaches the final voltage. DC/DC conversion circuit 33 supplies this power supply voltage VPRI to processing circuit 34 and isolator 27.

The processing circuit 34 is activated 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 on the transistor 38. As a result, in the primary side circuit 30, a current flows from the positive electrode of the storage battery 31 to the resistance element 36, the resistance element 37, and the transistor 38 in this order. That is, at this stage, current flows from the positive electrode of the storage battery 31 to both the phototransistor 26 and the transistor 38 of the photocoupler 24 via the resistance element 36 and the resistance element 37. The gate-source voltage Vgs of the transistor 32 remains at a voltage that allows the transistor 32 to be turned on. Therefore, the DC/DC conversion circuit 33 continues DC/DC conversion and continues to generate the power supply voltage VPRI.

After this, as shown in FIG. 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. Thereby, the transistor 42 changes from an on state to an off state. When the transistor 42 is turned off, the current I25 no longer flows through the light emitting diode 25 of the photocoupler 24, so no current flows through the phototransistor 26.

In the primary side circuit 30, current no longer flows to the phototransistor 26 in this way, but since the control signal CTL remains at a high level, current continues to flow to the transistor 38. That is, current flows from the positive electrode of the storage battery 31 to the resistive element 36, the resistive element 37, and the transistor 38 in this order. The gate-source voltage Vgs of the transistor 32 remains at a voltage that allows the transistor 32 to be turned on. Therefore, the DC/DC conversion circuit 33 continues DC/DC conversion and continues to generate the power supply voltage VPRI.

In this way, in the storage battery module 23, the transistor 42 is turned on during the period from timing t1 to t2, and a one-shot pulse activation current 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, 45 and the capacitive element 46. Timing t2 is earlier 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 is activated, and the transistor 38 is turned on. It is set to be later.

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.

In this way, the storage battery module 23 is activated. The processing circuit 34 monitors 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 of the storage battery control device 20 via the isolator 27 and the communication circuit 49, thereby supplying information regarding the operating state of the storage battery 31 to the controller 22.

Next, a case will be described in which the operation of the storage battery module 23 is stopped. First, the controller 22 of the storage battery control device 20 stops supplying the power supply voltage V1 to the plurality of 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 stoppage of the supply of the power supply voltage V1. As a result, as shown in FIG. 3, the power supply voltage VSEC falls to 0V at timing t3. As a result, the DC/DC conversion circuit 41 stops supplying the power supply voltage VSEC to the communication circuit 49 and the isolator 27.

In the control circuit 43, for example, since the capacitive element 46 is charged, the voltage at the node N3 is higher than the voltage at the node N1. Therefore, the diode 47 is turned on, and current flows from the capacitive element 46 to the communication circuit 49 and the isolator 27 via the diode 47, for example. In this way, the capacitive element 46 is quickly discharged. As a result, as shown in FIG. 3, the gate voltage VG of the transistor 42 quickly decreases.

When the power supply voltage VSEC falls, the isolator 27 is no longer supplied with the power supply voltage VSEC, so the isolator 27 fixes the signal to the processing circuit 34 at a low level. Based on the signal supplied from the isolator 27, the processing circuit 34 grasps that the supply of the power supply voltage V1 from the controller 22 of the storage battery control device 20 has been stopped, and changes the control signal CTL from a high level (active level). Change to 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, 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.

In this way, the storage battery module 23 stops operating. In the control circuit 43 of the secondary circuit 40, the capacitive element 46 is discharged by a 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 activated. 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 a short time.

In this way, the storage battery module 23 includes a first power supply circuit (DC/DC conversion circuit 41) that can operate based on the electric power supplied from the controller 22 of the storage battery control device 20, and an output terminal of the first power supply circuit. A photocoupler 24 having a first switch (transistor 42) provided in a current path connecting the current path and a ground node, a light emitting diode 25 provided in the current path, and a phototransistor 26, and a first power supply circuit ( a first control circuit (control circuit 43) capable of turning on the first switch (transistor 42) during a predetermined period according to the rise of the power supply voltage VSEC generated by the DC/DC conversion circuit 41); , a storage battery 31, a second power supply circuit (DC/DC conversion circuit 33) operable based on the power supplied from the storage battery 31, and a storage battery 31 and a second power supply circuit (DC/DC conversion circuit 33). It is operable based on the power supplied from the second switch (transistor 32) provided in the power supply path connecting the input terminal and the second power supply circuit (DC/DC conversion circuit 33), and the storage battery 31 a second control circuit that can turn on a second switch (transistor 32) based on the light reception result of the phototransistor 26 and an instruction from the processing circuit 34; (control circuit 35). Thereby, the control circuit 43 can turn on the transistor 42 for only a predetermined period, and can cause a current that is a one-shot pulse to flow through the photocoupler 24. This control circuit 43 can set the pulse width of this one-shot pulse. Since this control circuit 43 is provided in a part different from the current path, it can be prevented from affecting the current value of the activation current of the photocoupler 24. As a result, in the storage battery module 23, the degree of freedom in design can be increased.

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 constants 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 amount of charge 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, when trying to increase the time constant, it is necessary to increase the resistance value and capacitance value, but when the resistance value is increased, the current value of the activation current becomes small. Therefore, it is difficult to increase the time constant.

On the other hand, in the storage battery module 23, a control circuit 43 is provided, and a resistance element 48 is provided in the current path of the activation current, so the pulse width of the one-shot pulse and the current value of the activation current can be set individually. can do. As a result, in the storage battery module 23, the degree of freedom in design can be increased.

In addition, in the storage battery module 23, the photocoupler 24 is turned on only for a period corresponding to the timing when the first power supply circuit (DC/DC conversion circuit 41) is activated. Since the operating time of the circuit can be shortened, the circuit life can be extended and current consumption can be reduced.

Furthermore, the storage battery module 23 is provided with a photocoupler 24. Thereby, the power consumption of the storage battery module 23 can be reduced, for example, when the storage battery module 23 is removed from the storage battery system 2 and stored. That is, for example, when all signals are exchanged via the isolator 27 without providing the photocoupler 24, the DC/DC conversion circuit 33 needs to continue operating. 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 is stopped, so the secondary circuit 40 turns the transistor 32 on. This is because it becomes impossible to do so. In this way, if the DC/DC conversion circuit 33 continues to operate, power consumption will increase. Since the storage battery module 23 is provided with the photocoupler 24, by turning off the transistor 32, the operation of the DC/DC conversion circuit 33 can be stopped. Through this, the transistor 32 can be turned on, and the DC/DC conversion circuit 33 can be activated. Thereby, the power consumption of the storage battery module 23 can be reduced, for example, when the storage battery module 23 is removed from the storage battery system 2 and stored.

Furthermore, 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. I made it possible. The second control circuit (control circuit 35) is configured to turn on the transistor 32 during a period when the phototransistor 26 detects light, and turn on the transistor 32 during a period when the control signal CTL is active. did. Thereby, for example, the control circuit 35 can turn on the transistor 32 during a period in which an activation current flows through the photocoupler 24 and the phototransistor 26 detects light. Thereafter, the processing circuit 34 is activated, the processing circuit 34 activates the control signal CTL, and the control circuit 35 can maintain the transistor 32 in the on state. Thereby, the activation current of the photocoupler 24 can be stopped after that, so the operating time of the photocoupler 24 can be shortened. As a result, the circuit life can be extended and current consumption can be reduced.

Furthermore, the storage battery module 23 further includes a first resistance 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) was connected to the 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 resistance element (resistance element 48), and a control terminal connected to the second node (node N2). The first control circuit (control circuit 43) includes a second resistance element (having one end connected to the first node (node N1) and the other end connected to the second node (node N2). The capacitive element 46 has one end led to the second node (node N2) and the other end connected to the ground node. Thereby, the control circuit 43 can set the pulse width of the one-shot pulse, and the resistance element 48 can set the current value of the activation current, so that the degree of freedom in design can be increased.

In addition, in the storage battery module 23, the first control circuit (control circuit 43) includes a diode 47 having an anode connected to one end of the capacitive element 46 and a cathode connected to the first node (node N1). It was made to have. Thereby, for example, when the operation of the DC/DC conversion circuit 41 stops, the capacitive element 46 can be quickly discharged. Therefore, the storage battery module 23 can be quickly restarted (fast reset), for example.

[effect]
As described above, in this embodiment, the current path connects the first power supply circuit that can operate based on the power supplied from the controller of the storage battery control device and the output terminal of the first power supply circuit and the ground node. A first switch provided, a photocoupler having a light emitting diode and a phototransistor provided in a current path, and a power supply voltage generated by the first power supply circuit. A first control circuit capable of turning on a first switch during a period, a storage battery, a second power supply circuit operable based on power supplied from the storage battery, a storage battery and a second power supply. a second switch provided in a power supply path connecting an input terminal of the circuit; and a processing circuit that is operable based on the power supplied from the second power supply circuit and that is capable of monitoring the operating state of the storage battery; A second control circuit is provided that can turn on the second switch based on the light reception result of the light receiving element and an instruction from the processing circuit. This increases the degree of freedom in design.

In this embodiment, the photocoupler is turned on only for a period corresponding to the timing at which the first power supply circuit starts up, so the operating time of the photocoupler can be shortened. The circuit life can be extended and current consumption can be reduced.

In this embodiment, a photocoupler is provided. Thereby, power consumption can be reduced, for example, when the storage battery module is removed from the storage battery system and stored.

In this embodiment, the processing circuit is operable based on the power supplied from the second power supply circuit, and the control signal can be activated after startup. The second control circuit is configured to turn on the transistor during a period when the phototransistor detects light, and turn on the transistor during a period when the control signal is active. This makes it possible to extend the circuit life and reduce current consumption.

The present embodiment further includes a first resistance 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 was 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 resistance element, and a control terminal connected to the second node. I did it like that. 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, one end led to the second node, and a grounding and a capacitive element having the other end connected to the node. This increases the degree of freedom in design.

In this embodiment, the first control circuit includes a diode having an anode connected to one end of a capacitive element and a cathode connected to the first node. Thereby, the capacitive element can be discharged quickly, so that, for example, a restart (fast reset) can be performed quickly.

[Modification 1]
In the embodiments described above, the resistance element 45 is provided in the control circuit 43 as shown in FIG. 2, but the present invention is not limited to this. Alternatively, the resistor element 45 may not be provided, as in the storage battery module 29A shown in FIG. 4, for example. This storage battery module 29A has a control circuit 43A. The control circuit 43A includes 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 diode 47 is connected to node N2, and the cathode is connected to node N1. In this case, the control circuit 43A can set the pulse width of the one-shot pulse using the time constants of the resistive element 44 and the capacitive element 46.

<2. Second embodiment>
Next, a power storage system according to a second embodiment will be described. This embodiment differs from the first embodiment in the configuration of the control circuit of the secondary circuit in the storage battery module. Components that are substantially the same as those of the power storage system 1 according to the first embodiment are given the same reference numerals, and description thereof will be omitted as appropriate.

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, as in the first embodiment.

FIG. 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 constitute the secondary circuit 40 of the storage battery module 23. .

The control circuit 63 includes a delay circuit 64 in this example. 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.

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.

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

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

FIG. 6 shows an example of the operation of the control circuit 63.

At timing t11, when the power supply voltage VSEC rises, the control circuit 63 supplies power to the delay circuit 64, so the delay circuit 64 starts operating. By delaying the signal of power supply voltage VSEC by a predetermined time Td, a signal of gate voltage VG of transistor 42 is generated. As a result, the gate voltage VG rises at timing t12, which is delayed by a predetermined time Td from timing t11. During the period from timing t11 to timing t12, the gate voltage VG of the transistor 42 becomes 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. This turns the transistor 42 on.

When the transistor 42 turns on at timing t11, a current I25 flows in a current path from the output terminal of the DC/DC conversion circuit 41 to the ground node via the transistor 42, the resistive element 48, and the light emitting diode 25 of the photocoupler 24. flows. The current value of this current I25 is set by the resistance value of the resistance 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 causes a current to flow from the collector to the emitter.

After this, as shown in FIG. 6, at timing t12, the gate voltage VG of the transistor 42 rises. Thereby, the transistor 42 changes from an on state to an off state. When the transistor 42 is turned off, the current I25 no longer flows through the light emitting diode 25 of the photocoupler 24, so no current flows through the phototransistor 26.

In the primary side circuit 30, current no longer flows to the phototransistor 26 in this way, but since the control signal CTL remains at a high level, current continues to flow to the transistor 38. The gate-source voltage Vgs of the transistor 32 remains at a voltage that allows the transistor 32 to be turned on. Therefore, the DC/DC conversion circuit 33 continues DC/DC conversion and continues to generate the power supply voltage VPRI.

In this manner, in the storage battery module 53, the transistor 42 is turned on during the period from timing t11 to timing t12, and a one-shot pulse activation current flows. The length of the period between timings t11 and t12 is, for example, about several seconds, and is set by the time Td delayed by the delay circuit 64. Timing t12 is earlier 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 is activated, and the transistor 38 is turned on. It is set to be later.

In this way, the storage battery module 53 is activated.

Next, a case will be described in which the operation of the storage battery module 53 is stopped. First, the controller 22 of the storage battery control device 20 stops supplying the power supply voltage V1 to the plurality of 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 stoppage of the supply of the power supply voltage V1. As a result, as shown in FIG. 6, the power supply voltage VSEC falls to 0V at timing t13. As a result, the DC/DC conversion circuit 41 stops supplying the power supply voltage VSEC to the delay circuit 64, communication circuit 49, and isolator 27.

In the control circuit 63, the power supply to the delay circuit 64 is stopped, so the delay circuit 64 lowers the gate voltage VG of the transistor 42.

resistance elements

In this way, the storage battery module 53 stops operating. For example, in FIG. 6, 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 t13, the storage battery module 53 can be activated. 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 a short time.

The storage battery module 53 further includes a first resistance 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) was connected to the 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 resistance element (resistance element 48), and a control terminal connected to the second node (node N2). The first control circuit (control circuit 63) includes a delay circuit 64 capable of generating a second signal by delaying the first signal indicated by the power supply voltage VSEC by a predetermined time Td, and The first switch (transistor 42) can be turned on when the logic level of the second signal is high and the logic level of the second signal is low. Thereby, the control circuit 63 can set the pulse width of the one-shot pulse, and the resistance element 48 can set the current value of the activation current, so the degree of freedom in design can be increased.

As described above, this embodiment further includes a first resistance 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 was 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 resistance element, and a control terminal connected to the second node. I did it like that. The first control circuit includes a delay circuit capable of generating a second signal by delaying the first signal indicated by the power supply voltage by a predetermined time, and the logic level of the first signal is a high level. , the first switch can be turned on when the logic level of the second signal is low. This increases the degree of freedom in design. Other effects are similar to those of the first embodiment.

[Modification 2]
In the above embodiments, the P-type transistor 42 is used in the control circuit 63 as shown in FIG. There may be. 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 of this, a reverse polarity switch is provided to provide a high-level control voltage. The on state may be achieved by supplying a 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.

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.

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

In the example of FIG. 7, the controller 22 supplies the power supply voltage V1 to the plurality of storage battery modules 23, but the invention is not limited to this. Instead, for example, the energy control device 13 , the power supply voltage V1 may be supplied to the plurality of storage battery modules 23, or the hub device 14B may supply the power supply voltage V1 to the plurality of storage battery modules 23.

Note that the effects described in this specification are merely examples and are not limiting, and other effects may also exist.

Claims

a first power supply circuit operable 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 the rise of a power supply voltage generated by the first power supply circuit;
A storage battery that can store 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 operable based on the power supplied from the second power supply circuit and capable of monitoring the operating state of the storage battery;
and a second control circuit capable of turning on the second switch based on a light reception result of the light receiving element and an instruction from the processing circuit.
The processing circuit is operable based on power supplied from the second power supply circuit, and is capable of activating a control signal after activation,
The second control circuit is capable of turning on the second switch during a period when the light receiving element detects light, and turning on the second switch during a period when the control signal is active. The storage battery module according to claim 1, wherein the storage battery module is capable of being put into the state.
further comprising a first resistive element having one end and the other end connected to the 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. has a terminal,
The first control circuit includes:
a second resistance element having one end connected to the first node and the other end connected to the second node;
The storage battery module according to claim 1 , further comprising: a capacitive element having one end led to the second node and the other end connected to the ground node.
The first control circuit further includes a third resistance element having one end connected to the second node and the other end connected to a third node,
The storage battery module according to claim 3, wherein the one end of the capacitive element is connected to the third node.
The storage battery module according to claim 3 or 4, wherein the first control circuit further includes a diode having an anode connected to the one end of the capacitive element and a cathode connected to the first node. .
further comprising a first resistive element having one end and the other end connected to the 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. has a terminal,
The first control circuit includes a delay circuit capable of generating a second signal by delaying the first signal indicated by the power supply voltage by a predetermined time, and the logic level of the first signal is a high level. The storage battery module according to claim 1 or 2, wherein the first switch can be turned on when the logic level of the second signal is a low level.
Further comprising a communication circuit operable based on the power supplied from the first power supply circuit and capable of communicating with the external device,
The storage battery module according to any one of claims 1 to 6, wherein the processing circuit is capable of exchanging signals with the communication circuit.
further comprising an isolator operable based on the power supplied from the first power supply circuit and the power supplied from the second power supply circuit,
The storage battery module according to claim 7, wherein the processing circuit is capable of exchanging signals with the communication circuit via the isolator.
The processing circuit is capable of inactivating a control signal based on a signal from the isolator when power supply from the external device to the first power supply circuit is stopped,
The storage battery module according to claim 8, wherein the second control circuit is capable of turning off the second switch based on the control signal.
comprising: a plurality of storage battery modules; and a storage battery control device capable of controlling operations of the plurality of storage battery modules;
Each of the plurality of storage battery modules includes:
a first power supply circuit operable 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 the rise of a power supply voltage generated by the first power supply circuit;
A storage battery that can store 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 operable based on the power supplied from the second power supply circuit and capable of monitoring the state of the storage battery;
a second control circuit capable of turning on the second switch based on a light reception result of the light receiving element and an instruction from the processing circuit.