Control circuit for reducing power consumption of industrial and commercial energy storage battery management system

Abstract

The utility model provides a control circuit for reducing power consumption of an industrial and commercial energy storage battery management system. The control circuit comprises an energy management system, a battery cluster management unit, M battery management units, a first wake-up circuit and M second wake-up circuits. The first wake-up circuit can be used for waking up or sleeping the battery cluster management unit, and the second wake-up circuit can wake up or sleep the corresponding battery management unit. The energy management system is electrically connected with the battery cluster management unit through the first wake-up circuit, and the battery cluster management unit is electrically connected with the M battery management units through the M second wake-up circuits. Therefore, based on the circuit hardware module and the connection relation, the dormancy of the battery cluster management unit and the battery management unit in the battery management system can be realized, so that the electric energy loss of the battery management system is reduced, and the electric energy waste is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage battery management, in particular to a control circuit for reducing power consumption in an industrial and commercial energy storage battery management system. Background Art

[0002] In the field of industrial and commercial energy storage, the battery management system is an important component of the energy storage system and also a part of the power consumption of the energy storage system. The battery management system includes several BMUs (Battery Management Units) and a BCU (Battery Cluster Management Unit), which can monitor and manage the battery clusters in the energy storage system, as well as control the charging / discharging. At present, the battery management system generally operates 7*24 hours a day, while the energy storage system is in an idle state. In the idle state, the energy storage system does not need to be controlled by the battery management system, which means that when the energy storage system is in an idle state, the operation of the battery management system will cause energy waste. Utility Model Content

[0003] In view of this, an object of an embodiment of the present application is to provide a control circuit for reducing power consumption of an industrial and commercial energy storage battery management system, which can improve the problem of high power loss caused by uninterrupted operation of the battery management system.

[0004] In order to achieve the above technical objectives, the technical solutions adopted in this application are as follows:

[0005] The embodiment of the present application provides a control circuit for reducing power consumption of an industrial and commercial energy storage battery management system, the control circuit comprising:

[0006] An energy management system, a battery cluster management unit, M battery management units, a first wake-up circuit for waking up or putting the battery cluster management unit to sleep, and M second wake-up circuits for waking up or putting corresponding battery management units to sleep, where M is an integer greater than or equal to 1;

[0007] The energy management system is electrically connected to the battery cluster management unit through the first wake-up circuit, and the battery cluster management unit is electrically connected to M battery management units through M second wake-up circuits, respectively.

[0008] In some optional implementations, the first wake-up circuit includes a voltage-stabilizing diode, an anti-reverse diode, a first resistor, an optocoupler, a second resistor, and a capacitor;

[0009] Wherein, one end of the first resistor is electrically connected to one end of the voltage stabilizing diode, and is electrically connected to the energy management system through line A in the RS485 bus;

[0010] The other end of the first resistor is electrically connected to the cathode of the anti-reverse diode and the anode of the input side of the optocoupler, and the anode of the anti-reverse diode and the cathode of the input side of the optocoupler are both electrically connected to the other end of the voltage-stabilizing diode; the other end of the voltage-stabilizing diode is also electrically connected to the energy management system via the B line in the RS485 bus;

[0011] The collector of the output end of the optocoupler is electrically connected to the power supply, the emitter of the output end of the optocoupler is electrically connected to the power supply end of the battery cluster management unit, and the emitter of the output end of the optocoupler is also grounded through a second resistor and a capacitor connected in parallel.

[0012] In some optional implementations, the second wake-up circuit includes a CAN conversion chip, a DC / DC power supply module and an LDO power supply module;

[0013] The first end of the CAN conversion chip is electrically connected to the battery cluster management unit, the second end of the CAN conversion chip is electrically connected to the RX / TX pin of the corresponding battery management unit, and the third end of the CAN conversion chip is electrically connected to the wake-up pin of the corresponding battery management unit;

[0014] The input ends of the DC / DC power module and the LDO power module are both used to be electrically connected to a power supply, the DC / DC power module is electrically connected to the power supply pins of the corresponding battery management unit and the CAN conversion chip through a first diode, and the control end of the DC / DC power module is electrically connected to the EN pin of the corresponding battery management unit, wherein the anode of the first diode is electrically connected to the output end of the DC / DC power module;

[0015] The LDO power module is electrically connected to the power supply pins of the corresponding battery management unit and the CAN conversion chip through a second diode, wherein the anode of the second diode is electrically connected to the output end of the LDO power module.

[0016] In some optional implementations, the energy management system is configured to control the battery cluster management unit to enter a sleep state through the first wake-up circuit when receiving a first electrical signal indicating that the energy storage system is in an idle state.

[0017] In some optional implementations, the energy management system is further configured to control the first wake-up circuit to wake up the battery cluster management unit when receiving a second electrical signal indicating that the energy storage system enters a charge / discharge mode.

[0018] In some optional embodiments, the battery cluster management unit is used to control the M battery management units to enter a sleep state through the M second wake-up circuits when receiving a third electrical signal for sleep sent by the energy management system.

[0019] In some optional implementations, the battery cluster management unit is further configured to control the M second wake-up circuits to wake up the M battery management units upon receiving a fourth electrical signal for wake-up sent by the energy management system.

[0020] The utility model adopting the above technical solution has the following advantages:

[0021] In the technical solution provided in the present application, a control circuit for reducing power consumption in an industrial and commercial energy storage battery management system includes an energy management system, a battery cluster management unit, M battery management units, a first wake-up circuit and M second wake-up circuits. The first wake-up circuit can be used to wake up or hibernate the battery cluster management unit, and the second wake-up circuit can wake up or hibernate the battery management unit. The energy management system is electrically connected to the battery cluster management unit through the first wake-up circuit, and the battery cluster management unit is electrically connected to the M battery management units through the M second wake-up circuits. In this way, based on the aforementioned circuit hardware modules and connection relationships, the battery cluster management unit and the battery management unit in the battery management system can be hibernated to reduce the power loss of the battery management system and reduce power waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present application may be further described by the non-limiting embodiments given in the accompanying drawings. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings may be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of a control circuit for reducing power consumption in an industrial and commercial energy storage battery management system provided in an embodiment of the present application.

[0024] Figure 2 A schematic diagram of the circuit principle of the first wake-up circuit provided in an embodiment of the present application.

[0025] Figure 3 A schematic diagram of the circuit principle of the second wake-up circuit provided in an embodiment of the present application.

[0026] Icons: 10 - energy management system; 20 - battery cluster management unit; 30 - battery management unit; 40 - first wake-up circuit; 41 - voltage regulator diode; 42 - anti-reverse diode; 43 - first resistor; 44 - optocoupler; 45 - second resistor; 46 - capacitor; 50 - second wake-up circuit; 51 - first diode; 52 - second diode. DETAILED DESCRIPTION

[0027] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that in the drawings or descriptions, similar or identical parts use the same figure numbers, and the implementation methods not shown or described in the drawings are forms known to ordinary technicians in the relevant technical field. In the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0028] Please refer to Figures 1 to 3 The embodiment of the present application provides a control circuit for reducing power consumption of an industrial and commercial energy storage battery management system. The control circuit can be deployed in an energy storage system. The energy storage system includes multiple battery clusters, each of which can include multiple single cells. The energy storage system can be used to power a load device.

[0029] In this embodiment, the control circuit may include an energy management system (EMS) 10, a battery cluster management unit (BCU) 20, M battery management units (BMU) 30, a first wake-up circuit 40 and M second wake-up circuits 50. The energy management system 10 is electrically connected to the battery cluster management unit 20 through the first wake-up circuit 40, and the battery cluster management unit 20 is electrically connected to the M battery management units 30 through the M second wake-up circuits 50, respectively, and the M second wake-up circuits 50 correspond to the M battery management units 30 one by one. The battery cluster management unit 20 can be used as a master controller in the battery management system, and the battery management unit 30 can be used as a slave controller in the battery management system. The first wake-up circuit 40 can be used to wake up or sleep the battery cluster management unit 20, and each second wake-up circuit 50 can wake up or sleep the corresponding battery management unit 30.

[0030] In this embodiment, the energy management system 10 can be electrically connected to the battery cluster management unit 20 through the RS485 bus and via the first wake-up circuit 40, and the first wake-up circuit 40 is an RS485 wake-up circuit. The battery cluster management unit 20 is electrically connected to the corresponding battery management unit 30 through the CAN bus and via each second wake-up circuit 50. The second wake-up circuit 50 is a CAN wake-up circuit.

[0031] In this embodiment, when the energy storage system is in an idle state, it means that it is not in a charging / discharging state. At this time, some electronic devices (such as BCU and BMU) in the battery management system can be in a dormant state. For example, the control circuit can control the battery management unit 30 to be in a dormant state by using the second wake-up circuit 50, and control the battery cluster management unit 20 to be in a dormant state by using the first wake-up circuit 40, thereby reducing energy consumption.

[0032] In this embodiment, the energy management system 10 is used to control the battery cluster management unit 20 to enter a dormant state through the first wake-up circuit 40 when receiving a first electrical signal indicating that the energy storage system is in an idle state. The energy management system 10 is also used to control the first wake-up circuit 40 to wake up the battery cluster management unit 20 when receiving a second electrical signal indicating that the energy storage system enters a charge / discharge mode.

[0033] In this embodiment, the battery cluster management unit 20 is used to control the M battery management units 30 to enter the dormant state through the M second wake-up circuits 50 when receiving the third electrical signal for dormancy sent by the energy management system 10. The battery cluster management unit 20 is also used to control the M second wake-up circuits 50 to wake up the M battery management units 30 when receiving the fourth electrical signal for wake-up sent by the energy management system 10.

[0034] In this embodiment, the first electrical signal, the second electrical signal, the third electrical signal, and the fourth electrical signal may be level signals or other types of signals, which are not specifically limited here. For example, the energy management system 10 may be connected to the energy storage cloud platform via Ethernet. The energy storage cloud platform may send a control signal to the energy management system 10 to start the peak shaving and valley filling strategy, or to exit the peak shaving and valley filling strategy. Among them, the peak shaving and valley filling strategy is a conventional strategy used to control the charging or external discharge of the battery cluster in the energy storage system.

[0035] When the energy management system 10 receives the control signal (first electrical signal) to exit the peak shaving and valley filling strategy, it indicates that the energy storage system will be in an idle state. At this time, the battery cluster management unit 20 and the battery management unit 30 need to be in a dormant state. That is, when receiving the control signal, if the battery cluster management unit 20 and the battery management unit 30 are not in a dormant state, they need to enter dormancy. For example, when the EMS receives the first control signal to exit the peak shaving and valley filling strategy, it indicates that the energy storage system should be static. At this time, the dormancy command is sent to the BCU via RS485 bus communication. After receiving the command, the BCU sends it to the BMS intranet and sends it to each BMU via the CAN bus. Before going into sleep mode, each BMU returns a successful sleep command. The BCU enters sleep mode only after receiving the successful sleep of each BMU.

[0036] When the energy management system 10 receives the control signal (second electrical signal) to start the peak shaving and valley filling strategy, it indicates that the energy storage system will be in a charging / discharging state. At this time, the battery cluster management unit 20 and the battery management unit 30 need to be in an operating state. That is, when receiving the control signal, if the battery cluster management unit 20 and the battery management unit 30 are in a dormant state, they need to be awakened. For example, when the EMS receives the second control signal to start the peak shaving and valley filling strategy, it indicates that the energy storage system will enter a charging / discharging mode. At this time, the EMS sends instructions to the BCU through RS485 bus communication, and the EMS wakes up the BCU through the wake-up circuit of the RS485 bus. After the BCU wakes up, it wakes up each BMU in the current cluster through the intranet CAN bus. When the BMS is awakened as a whole, the energy storage system enters a normal working state.

[0037] It should be noted that when the first wake-up circuit 40 and the second wake-up circuit 50 perform a wake-up operation or a sleep operation, if the first operation fails, the operation may be repeated for multiple times until the operation succeeds or the number of times reaches a set number.

[0038] Please refer to Figure 2 In this embodiment, the first wake-up circuit 40 may include a voltage-stabilizing diode 41 , an anti-reverse diode 42 , a first resistor 43 , an optocoupler 44 , a second resistor 45 and a capacitor 46 .

[0039] One end of the first resistor 43 is electrically connected to one end of the voltage-stabilizing diode 41 , and is electrically connected to the energy management system 10 via the A line in the RS485 bus.

[0040] The other end of the first resistor 43 is electrically connected to the cathode of the anti-reverse diode 42 and the anode of the input side of the optocoupler 44. The anode of the anti-reverse diode 42 and the cathode of the input side of the optocoupler 44 are electrically connected to the other end of the Zener diode 41. The other end of the Zener diode 41 is also electrically connected to the energy management system 10 via the B line in the RS485 bus.

[0041] The collector of the output end of the optocoupler 44 is electrically connected to the power supply, the emitter of the output end of the optocoupler 44 is electrically connected to the power supply end of the battery cluster management unit 20, and the emitter of the output end of the optocoupler 44 is also grounded through a second resistor 45 and a capacitor 46 connected in parallel.

[0042] The RS485 bus uses differential signals to send and receive data. The logic "1" of the differential level means that the voltage difference between line A and line B is between +2V and +6V. When a logic "1" is received on the RS485 bus, the light-emitting diode of the optocoupler 44 is turned on, and the receiving end of the optocoupler 44 is turned on. At this time, the WAKE pin (power supply end) of the battery cluster management unit 20 obtains a high level, so that the battery cluster management unit 20 is powered on and awakened.

[0043] The logic "0" of the differential level means that the voltage difference between line A and line B is between -2V and -6V. When the logic "0" is received on the RS485 bus, the light-emitting diode of the optocoupler 44 is turned off, and the receiving end of the optocoupler 44 is turned off. At this time, the WAKE pin (power supply end) of the battery cluster management unit 20 is at a low level, and the battery cluster management unit 20 enters sleep mode.

[0044] Please refer to Figure 3 In this embodiment, the second wake-up circuit 50 includes a CAN conversion chip, a DC / DC power supply module and an LDO power supply module.

[0045] The first end of the CAN conversion chip is electrically connected to the battery cluster management unit 20 , the second end of the CAN conversion chip is electrically connected to the RX / TX pin of the corresponding battery management unit 30 , and the third end of the CAN conversion chip is electrically connected to the wake-up pin of the corresponding battery management unit 30 .

[0046] The input ends of the DC / DC power module and the LDO power module are both used to be electrically connected to the power supply. The DC / DC power module is electrically connected to the power supply pins of the corresponding battery management unit 30 and the CAN conversion chip through the first diode 51. The control end of the DC / DC power module is electrically connected to the EN pin of the corresponding battery management unit 30, wherein the positive electrode of the first diode 51 is electrically connected to the output end of the DC / DC power module.

[0047] The LDO power module is electrically connected to the power supply pins of the corresponding battery management unit 30 and the CAN conversion chip through the second diode 52, wherein the anode of the second diode 52 is electrically connected to the output end of the LDO power module.

[0048] In this embodiment, the LDO power module is used to provide a Normal type of power, and the DC / DC power module is used to provide a Common type of power. The CAN conversion chip can be used to send a wake-up or sleep level signal to the battery management unit 30.

[0049] Please refer again Figure 3 Before the battery management unit 30 goes into sleep mode, the MCU in the battery management unit 30 can turn off the DC / DC power module, so that only the normal power (i.e., the Normal type power) of the CAN and MCU flows, and then the other peripheral circuits of the battery management unit 30 enter the sleep state. When waking up the battery management unit 30, the MCU in the battery management unit 30 turns on the DC / DC power module again, and the other peripheral circuits of the battery management unit 30 are powered on again, so as to be awakened.

[0050] As an example, the current industrial and commercial energy storage battery management system consists of several BMUs and one BCU. The general power consumption of a BMU is 0.3-0.7W / hour, and the general power consumption of a BCU is 3-5W / hour. Taking a 215kWh energy storage cabinet as an example, the overall power consumption of the battery management system is about 8W / hour. If the control circuit provided in this application is used to control some electronic devices in the battery management system to enter sleep mode, the overall power consumption of the battery management system after sleep mode will be less than 0.5W / hour, which can reduce the energy consumption of the system. Among them, the energy storage system is idle for nearly 10 hours a day, which will bring considerable benefits to GWh-level industrial and commercial energy storage.

[0051] It should be noted that in this embodiment, the model parameters of each electronic device can be flexibly selected according to actual conditions. In addition, the transmission and processing of various signals and instructions are conventional technologies, and the improvement of this application is in the connection relationship of each electronic device, and does not involve improvements in computer programs and method flows.

[0052] Through the description of the above implementation methods, technical personnel in this field can clearly understand that the present application can be implemented by hardware, and can also be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each implementation scenario of the present application.

[0053] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control circuit for reducing power consumption in an industrial and commercial energy storage battery management system, characterized in that: The control circuit comprises: An energy management system, a battery cluster management unit, M battery management units, a first wake-up circuit for waking up or putting the battery cluster management unit to sleep, and M second wake-up circuits for waking up or putting corresponding battery management units to sleep, where M is an integer greater than or equal to 1; The energy management system is electrically connected to the battery cluster management unit through the first wake-up circuit, and the battery cluster management unit is electrically connected to M battery management units through M second wake-up circuits, respectively.

2. The control circuit according to claim 1, characterized in that: The first wake-up circuit includes a voltage-stabilizing diode, an anti-reverse diode, a first resistor, an optocoupler, a second resistor and a capacitor; Wherein, one end of the first resistor is electrically connected to one end of the voltage stabilizing diode, and is electrically connected to the energy management system through line A in the RS485 bus; The other end of the first resistor is electrically connected to the cathode of the anti-reverse diode and the anode of the input side of the optocoupler, and the anode of the anti-reverse diode and the cathode of the input side of the optocoupler are both electrically connected to the other end of the voltage-stabilizing diode; the other end of the voltage-stabilizing diode is also electrically connected to the energy management system via the B line in the RS485 bus; The collector of the output end of the optocoupler is electrically connected to the power supply, the emitter of the output end of the optocoupler is electrically connected to the power supply end of the battery cluster management unit, and the emitter of the output end of the optocoupler is also grounded through a second resistor and a capacitor connected in parallel.

3. The control circuit according to claim 1, characterized in that: The second wake-up circuit includes a CAN conversion chip, a DC / DC power supply module and an LDO power supply module; The first end of the CAN conversion chip is electrically connected to the battery cluster management unit, the second end of the CAN conversion chip is electrically connected to the RX / TX pin of the corresponding battery management unit, and the third end of the CAN conversion chip is electrically connected to the wake-up pin of the corresponding battery management unit; The input ends of the DC / DC power module and the LDO power module are both used to be electrically connected to a power supply, the DC / DC power module is electrically connected to the power supply pins of the corresponding battery management unit and the CAN conversion chip through a first diode, and the control end of the DC / DC power module is electrically connected to the EN pin of the corresponding battery management unit, wherein the anode of the first diode is electrically connected to the output end of the DC / DC power module; The LDO power module is electrically connected to the power supply pins of the corresponding battery management unit and the CAN conversion chip through a second diode, wherein the anode of the second diode is electrically connected to the output end of the LDO power module.

4. The control circuit according to claim 1, characterized in that: The energy management system is used to control the battery cluster management unit to enter a dormant state through the first wake-up circuit when receiving a first electrical signal indicating that the energy storage system is in an idle state.

5. The control circuit according to claim 1, characterized in that: The energy management system is further configured to control the first wake-up circuit to wake up the battery cluster management unit when receiving a second electrical signal indicating that the energy storage system enters a charge / discharge mode.

6. The control circuit according to claim 1, characterized in that: The battery cluster management unit is used to control the M battery management units to enter a dormant state through the M second wake-up circuits when receiving a third electrical signal for dormancy sent by the energy management system.

7. The control circuit according to claim 1, characterized in that: The battery cluster management unit is further configured to control the M second wake-up circuits to wake up the M battery management units upon receiving a fourth electrical signal for wake-up sent by the energy management system.

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