Battery low-power-consumption control circuit and energy storage system

Abstract

The utility model discloses a battery low-power-consumption control circuit and an energy storage system, and belongs to the technical field of batteries. The battery low-power-consumption control circuit comprises a switch module and a driving module. The switch module is connected between the battery and a switch power supply of the energy storage system; the switching power supply is used for supplying power to a control component in the energy storage system; the switch module is used for switching on or switching off according to the potential of the control end of the switch module; the control end of the driving module is connected with a driving control signal; one of the first input end and the second input end of the driving module is connected with the positive electrode of the battery, and the other is connected with the negative electrode of the battery; the driving output end of the driving module is connected with the control end of the switch module; the driving module is used for controlling the first input end or the second input end to be communicated with the driving output end according to the driving control signal. The embodiment of the utility model can reduce the energy consumption of the battery by the control part in the energy storage system, and reduce the power consumption of the battery.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery low-power consumption control circuit and an energy storage system. Background Art

[0002] With the development of the energy storage PCS (Power Conversion System, converter) system, users have put forward higher and higher requirements for the use efficiency of batteries. As an energy storage device, the batteries in the energy storage system have the problem that the charge and discharge efficiency cannot reach 100%. One of the reasons is that the control components in the energy storage system consume energy, increasing the power consumption of the batteries. Summary of the Utility Model

[0003] The utility model provides a battery low-power consumption control circuit and an energy storage system to reduce the energy consumption of the control components in the energy storage system on the batteries and reduce the battery power consumption.

[0004] In the first aspect, an embodiment of the utility model provides a battery low-power consumption control circuit, including:

[0005] A switch module, connected between the battery and the switching power supply of the energy storage system; the switching power supply is used to supply power to the control components in the energy storage system; the switch module is used to conduct or cut off according to the potential of the control end of the switch module;

[0006] A driving module; the control end of the driving module accesses a driving control signal; one of the first input end and the second input end of the driving module is connected to the positive electrode of the battery, and the other is connected to the negative electrode of the battery; the driving output end of the driving module is connected to the control end of the switch module; the driving module is used to control the connection between the first input end or the second input end and the driving output end according to the driving control signal.

[0007] Optionally, the switch module includes: a first transistor;

[0008] The control pole of the first transistor is connected to the control end of the switch module, the first pole of the first transistor is connected to the switching power supply, and the second pole of the first transistor is connected to the battery.

[0009] Optionally, the driving module includes:

[0010] A current limiting unit, the first end of the current limiting unit is connected to the first input end of the driving module, and the second end of the current limiting unit is connected to the driving output end of the driving module;

[0011] A switching unit, a first end of the switching unit is connected to a second input end of the driving module, and a second end of the switching unit is connected to a driving output end of the driving module; the switching unit is configured to conduct or cut off according to a potential of a control end of the switching unit;

[0012] A driving unit, a control end of the driving unit accesses the driving control signal, and an output end of the driving unit is connected to the control end of the switching unit; the driving unit is configured to control the potential transmitted to the control end of the switching unit according to the driving control signal.

[0013] Optionally, the current limiting unit includes: at least one first resistor connected between a first input end of the driving module and a driving output end of the driving module;

[0014] And / or, the switching unit includes: a relay; a contact switch of the relay is connected between a second input end of the driving module and a driving output end of the driving module, and a coil of the relay is connected to the control end of the switching unit;

[0015] And / or, the driving unit includes: a second transistor; a control electrode of the second transistor accesses the driving control signal, a first electrode of the second transistor accesses a first power signal, and a second electrode of the second transistor is connected to the control end of the switching unit;

[0016] And / or, the driving module further includes: a voltage stabilizing unit connected between a second input end of the driving module and a driving output end of the driving module.

[0017] In this embodiment, a driving module is constructed based on a second transistor and a relay. The on / off of the second transistor controls whether the coil of the relay is powered on, thereby controlling whether the contact switch of the relay is conducted, so as to control the voltage transmitted to the first transistor, and realize the control of the on / off state of the switching module.

[0018] Optionally, the driving unit further includes: a second resistor, a third resistor and a first capacitor; a first end of the second resistor accesses the driving control signal, a second end of the second resistor is connected to the control electrode of the second transistor; the third resistor is connected between the control electrode and the first electrode of the second transistor; the first capacitor is connected between the control electrode and the first electrode of the second transistor.

[0019] Optionally, a first connection end of the switching module is connected to a first end of the switching power supply, a second connection end of the switching module is connected to a first pole of the battery, and a second end of the switching power supply is connected to a second pole of the battery;

[0020] Wherein, the first end of the switching power supply is the positive power supply end, the second end of the switching power supply is the negative power supply end, the first pole of the battery is the positive electrode, and the second pole of the battery is the negative electrode; or, the first end of the switching power supply is the negative power supply end, the second end of the switching power supply is the positive power supply end, the first pole of the battery is the negative electrode, and the second pole of the battery is the positive electrode.

[0021] Optionally, the battery low-power consumption control circuit further includes: a first reverse connection prevention module connected between the first end of the switching power supply and the first connection end of the switching module; and / or, a second reverse connection prevention module connected between the second end of the switching power supply and the second pole of the battery.

[0022] Optionally, the battery low-power consumption control circuit further includes: a rectification module connected between the commercial power and the switching power supply.

[0023] With this arrangement in this embodiment, it is equivalent to providing another power-taking method for the switching power supply, so that when the switching module is disconnected, the switching power supply can still take power from the commercial power on the AC side through the rectification module, increasing the power-taking path of the switching power supply and improving the flexibility of the power-taking method of the switching power supply.

[0024] Optionally, the control component includes the control unit of the inverter; the control unit is connected to the control end of the drive module; the control unit is used to output the drive control signal;

[0025] The control unit is further connected to the battery management system; the battery management system is used to control the potential of the drive control signal output by the control unit.

[0026] Since the battery management system itself has the function of detecting the state of charge of the battery, with this arrangement in this embodiment, the battery management system can automatically control the output of the control unit according to the state of charge of the battery, making the control process more intelligent.

[0027] In a second aspect, an embodiment of the present invention further provides an energy storage system, including: a battery, a switching power supply, a control component, and a battery low-power consumption control circuit as provided in any embodiment of the present invention.

[0028] In the battery low-power consumption control circuit provided by the embodiment of the present utility model, a switch module and a driving module are provided. Compared with manually controlling whether the battery supplies power to the switching power supply through a button, automatic control of the on / off of the power supply path from the battery to the switching power supply can be achieved, and the intelligence of the circuit is higher. Moreover, by directly connecting the two input ends of the driving module to the positive and negative electrodes of the battery respectively, it is equivalent to using the positive and negative electrode potentials of the battery as the on / off control potentials of the switch module, which can avoid introducing other control signals, thereby simplifying the circuit structure. The battery low-power consumption control circuit supports the on / off control of the power supply path from the battery to the switching power supply. When the battery needs to reduce power consumption, by controlling the switch module to disconnect, the switching power supply cannot obtain power from the battery, so that the control component no longer consumes the energy of the battery, thereby reducing the power consumption of the battery and improving the usage efficiency of the battery. Especially in the case of long-term standby, the problem of over-discharge of the battery can be avoided, and the service life of the battery can be extended.

[0029] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 FIG. 1 is a schematic structural diagram of a battery low-power consumption control circuit provided by an embodiment of the present utility model;

[0032] Figure 2 FIG. 2 is a schematic structural diagram of another battery low-power consumption control circuit provided by an embodiment of the present utility model;

[0033] Figure 3 FIG. 3 is a schematic structural diagram of yet another battery low-power consumption control circuit provided by an embodiment of the present utility model;

[0034] Figure 4 FIG. 4 is a schematic structural diagram of yet another battery low-power consumption control circuit provided by an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] To enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0037] The embodiment of the present utility model provides a battery low-power consumption control circuit, which can be used to cut off the power supply of the battery to the switching power supply, thereby reducing the power consumption of the battery. Figure 1 is a schematic structural diagram of a battery low-power consumption control circuit provided by the embodiment of the present utility model. Refer to Figure 1 In this battery low-power consumption control circuit 10, it includes: a switch module K1 and a driving module 11.

[0038] Among them, the switch module K1 is connected between the battery B1 and the switching power supply S1 of the energy storage system. The switching power supply S1 is used to supply power to the control components in the energy storage system; the switch module K1 is used to conduct or cut off according to the potential of the control end of the switch module K1. The control end of the driving module 11 is connected to the driving control signal SD; one of the first input end and the second input end of the driving module 11 is connected to the positive electrode of the battery B1, and the other is connected to the negative electrode of the battery B1; the driving output end of the driving module 11 is connected to the control end of the switch module K1. The driving module 11 is used to control the connection between the first input end or the second input end of the driving module 11 and the driving output end of the driving module 11 according to the driving control signal SD, so as to control the potential of the control end of the switch module K1 to be the positive electrode potential or the negative electrode potential of the battery B1. Exemplarily, the control component includes, for example, the control unit of the converter, etc.

[0039] By controlling the on / off state of the switch module K1, it is possible to control whether the switching power supply S1 draws power from the battery B1. Among them, the switch module K1 can be connected between the positive electrode of the battery B1 and the positive power supply terminal of the switching power supply S1, or connected between the negative electrode of the battery B1 and the negative power supply terminal of the switching power supply S1, as long as the power supply path from the battery B1 to the switching power supply S1 can be disconnected when the switch module K1 is turned off. The switch module K1 can be composed of any controllable switch device. One of the positive electrode potential and the negative electrode potential of the battery B1 can be used as the conduction potential of the switch module K1 to control the conduction of the switch module K1, and the other can be used as the cut-off potential of the switch module K1 to control the turn-off of the switch module K1. The driving module 11 is specifically configured to control the connection between its first input terminal and the driving output terminal, or control the connection between its second input terminal and the driving output terminal according to the potential of its control terminal. The driving control signal SD can be provided by any control component in the energy storage system, for example, provided by the battery management system, or provided by the control unit in the inverter. The control component can control the potential of the driving control signal SD according to the working state of the energy storage system and / or the state of charge (SOC) of the battery B1. For example, when the energy storage system is in the standby state and / or the SOC of the battery B1 is lower than the preset threshold, the potential of the driving control signal SD can control the driving module 11 to turn off the switch module K1, so that the battery B1 stops supplying power to the switching power supply S1, reducing the power consumption of the battery B1. In this case, it can be considered that the battery B1 enters the low-power mode. Especially when the energy storage system is on standby, if the control component continuously consumes battery energy, in the case of long-term standby, it may cause over-discharge problems of the battery, affecting the service life of the battery; in this case, by controlling the battery B1 to enter the low-power mode through the battery low-power control circuit 10, over-discharge of the battery can be effectively avoided, and the service life of the battery can be improved.

[0040] Taking the positive electrode potential of the battery B1 as the conduction potential of the switch module K1 and the negative electrode potential as the cut-off potential of the switch module K1; and taking the first input terminal of the driving module 11 connected to the positive electrode of the battery B1 and the second input terminal connected to the negative electrode of the battery B1 as an example, the working process of the battery low-power control circuit 10 can be as follows:

[0041] When the energy storage system starts up and operates normally, the potential of the driving control signal SD controls the connection between the first input terminal and the driving output terminal of the driving module 11, so that the positive electrode potential of the battery B1 is transmitted to the control terminal of the switch module K1, controlling the switch module K1 to conduct; the switching power supply S1 is connected to the battery B1, and power can be drawn from the battery B1 and supplied to the control unit of the inverter and so on.

[0042] When the battery B1 needs to enter the low-power mode, the potential of the drive control signal SD controls the connection between the second input terminal and the drive output terminal of the drive module 11, so that the negative potential of the battery B1 is transmitted to the control terminal of the switch module K1 to control the switch module K1 to turn off; the connection between the switch power supply S1 and the battery B1 is disconnected, and the power supply path of the switch power supply S1 is cut off, and it cannot draw power from the battery B1, thereby reducing the power consumption of the battery B1.

[0043] In the battery low-power control circuit 10 provided by the embodiment of the present invention, a switch module K1 and a drive module 11 are provided. Compared with manually controlling whether the battery B1 supplies power to the switch power supply S1 through a manual button, the on-off of the power supply path from the battery B1 to the switch power supply S1 can be automatically controlled, and the intelligence of the circuit is higher. Moreover, the two input terminals of the drive module 11 are directly connected to the positive and negative electrodes of the battery B1 respectively, which is equivalent to using the positive and negative electrode potentials of the battery B1 as the on-off control potential of the switch module K1, and other control signals can be avoided from being introduced, thereby simplifying the circuit structure. The battery low-power control circuit 10 supports the on-off control of the power supply path from the battery B1 to the switch power supply S1. When the battery B1 needs to reduce power consumption, by controlling the switch module K1 to turn off, the switch power supply S1 cannot draw power from the battery B1, so that the control component no longer consumes the energy of the battery B1, thereby reducing the power consumption of the battery B1 and improving the use efficiency of the battery B1. Especially in the case of long-term standby, the problem of over-discharge of the battery can be avoided, and the service life of the battery can be extended.

[0044] Figure 2 is a schematic structural diagram of another battery low-power control circuit provided by the embodiment of the present invention. Refer to Figure 2 On the basis of the above embodiments, optionally, the battery low-power control circuit further includes: a rectification module 30, connected between the commercial power GRID and the switch power supply S1. The rectification module 30 can be used as an AC power-taking module of the switch power supply S1 to convert the alternating current provided by the commercial power GRID into the direct current required by the switch power supply S1. Specifically, the rectification module 30 can adopt a three-phase rectifier bridge structure, such as a three-phase rectifier bridge composed of diodes; among them, in order to improve the withstand voltage, two or more diodes can be connected in series in each arm of the rectifier bridge.

[0045] This embodiment is configured in such a way that it is equivalent to providing another power - taking method for the switching power supply S1. When the switching module K1 is disconnected, the switching power supply S1 can still obtain power from the commercial power GRID on the AC side through the rectification module 30, enabling the control component to still be powered normally while ensuring low power consumption of the battery B1. The switching power supply S1 is connected to the commercial power GRID through the rectification module 30. When the switching module K1 is conducting, the switching power supply S1 can obtain power from both the AC side (GRID side) and the DC side (battery B1 side): when the voltage provided by the battery side is greater than the output voltage of the rectification module 30 (e.g., 1.414 times the AC - side line voltage), the switching power supply S1 obtains power from the battery B1; when the voltage provided by the battery side is less than the output voltage of the rectification module 30, the switching power supply S1 can obtain power from the GRID. Based on this structure, in order to save energy of the battery B1, the switching module K1 can be controlled to be disconnected so that the switching power supply S1 can only obtain power from the AC side; for example, when the energy storage system is in the standby state, the switching module K1 can be controlled to be disconnected. From another perspective, in the off - grid situation, when the energy storage system is powered on, the switching module K1 can be controlled to be conducting, and the switching power supply S1 can directly obtain power from the battery B1. The power - taking method of the switching power supply S1 is more flexible and can adapt to various working conditions. Therefore, the embodiment of the present utility model can balance the low power consumption of the battery B1 and the normal operation of the energy storage system in the off - grid situation.

[0046] Based on the above - mentioned embodiments, optionally, the specific connection relationship between the switching module K1, the switching power supply S1, and the battery B1 can be: the first connection end of the switching module K1 is connected to the first end of the switching power supply S1, the second connection end of the switching module K1 is connected to the first pole of the battery B1, and the second end of the switching power supply S1 is connected to the second pole of the battery B1. Among them, as Figure 2 shown, the first end of the switching power supply S1 is the negative power supply end, the second end of the switching power supply S1 is the positive power supply end, the first pole of the battery B1 is the negative pole, and the second pole of the battery B1 is the positive pole; that is, the switching module K1 is connected between the negative power supply end of the switching power supply S1 and the negative pole of the battery B1. Or, it can also be set that the switching module K1 is connected between the positive power supply end of the switching power supply S1 and the positive pole of the battery B1, that is, the first end of the switching power supply S1 is the positive power supply end, the second end of the switching power supply S1 is the negative power supply end, the first pole of the battery B1 is the positive pole, and the second pole of the battery B1 is the negative pole.

[0047] Based on the above - mentioned embodiments, optionally, the battery low - power - consumption control circuit may further include at least one of a first reverse - connection prevention module 21 and a second reverse - connection prevention module 22 to prevent the battery B1 from being reversely connected and damaging the switching power supply S1 circuit, thereby realizing circuit protection. Specifically, the first reverse - connection prevention module 21 can be connected between the first end of the switching power supply S1 and the first connection end of the switching module K1, and the second reverse - connection prevention module 22 can be connected between the second end of the switching power supply S1 and the second pole of the battery B1.

[0048] Exemplarily, the first reverse connection prevention module 21 may include a first diode D1, and the second reverse connection prevention module 22 may include a second diode D2. Taking the first end of the switching power supply S1 as the negative power supply terminal, the second end of the switching power supply S1 as the positive power supply terminal, the first pole of the battery B1 as the negative electrode, and the second pole of the battery B1 as the positive electrode as an example, the anode of the first diode D1 is connected to the negative power supply terminal of the switching power supply S1, and the cathode is connected to the first connection terminal of the switching module K1; the anode of the second diode D2 is connected to the positive electrode of the battery B1, and the cathode is connected to the positive power supply terminal of the switching power supply S1.

[0049] The following describes the possible specific structures of the functional modules in the battery low-power consumption control circuit 10, but it does not limit the present invention.

[0050] Figure 3 It is a schematic structural diagram of another battery low-power consumption control circuit provided by an embodiment of the present invention. Refer to Figure 3 , on the basis of the above embodiments, optionally, the switching module K1 includes: a first transistor Q1. The control electrode of the first transistor Q1 is connected to the control terminal of the switching module K1, the first pole of the first transistor Q1 is connected to the switching power supply S1, and the second pole of the first transistor Q1 is connected to the battery B1.

[0051] Exemplarily, the first transistor Q1 may be a switchable transistor such as a triode, a MOS transistor, or an IGBT. Since the maximum voltage of the battery B1 in the energy storage system is often relatively high, it is difficult to find a normally closed relay that meets the requirements as the switching module K1. In contrast, the selection range of transistors is larger and the difficulty is lower. Moreover, compared with the normally closed relay of a high voltage level, using the first transistor Q1 as the switching module K1 can effectively reduce the circuit cost. The conduction potential and the cut-off potential of the first transistor Q1 can be determined according to the specific type of the first transistor Q1. For example, when the first transistor Q1 is a PNP triode, the positive voltage of the battery B1 can be used as its cut-off potential, and the negative voltage of the battery B1 can be used as its conduction potential; when the first transistor Q1 is an NPN triode, the positive voltage of the battery B1 can be used as its conduction potential, and the negative voltage of the battery B1 can be used as its cut-off potential.

[0052] Figure 4 It is a schematic structural diagram of another battery low-power consumption control circuit provided by an embodiment of the present invention. Refer to Figure 4, in one embodiment, optionally, the driving module 11 includes: a current limiting unit 111, a switching unit 112, and a driving unit 113. The first end of the current limiting unit 111 is connected to the first input end of the driving module 11, and the second end of the current limiting unit 111 is connected to the driving output end of the driving module 11. The first end of the switching unit 112 is connected to the second input end of the driving module 11, and the second end of the switching unit 112 is connected to the driving output end of the driving module 11; the switching unit 112 is configured to conduct or cut off according to the potential of the control end of the switching unit 112. The control end of the driving unit 113 is connected to the driving control signal SD, and the output end of the driving unit 113 is connected to the control end of the switching unit 112; the driving unit 113 is configured to control the potential transmitted to the control end of the switching unit 113 according to the driving control signal SD.

[0053] Specifically, the current limiting unit 111 may include: at least one first resistor R1 connected between the first input end of the driving module 11 and the driving output end of the driving module 11. When the current limiting unit 111 includes a plurality of first resistors R1, the plurality of first resistors R1 may be connected in series. Among them, to reduce the power consumed by the current limiting unit 111 when the switching unit 112 is conducting, the value of the first resistor R1 can be selected as large as possible. For example, the current flowing through the current limiting unit 111 when the battery B1 only supplies power to the current limiting unit 111 is limited to less than 5 mA. It can be understood that the number of the first resistors R1 can be adjusted according to the actual situation, and the resistance values of different first resistors R1 can be equal or unequal, which is not specifically limited here.

[0054] The switching unit 112 may include: a relay RELAY1; the contact switch of the relay RELAY1 is connected between the second input end of the driving module 11 and the driving output end of the driving module 11, and the coil of the relay RELAY1 is connected to the control end of the switching unit 112. Exemplarily, one end of the coil of the relay RELAY1 is connected to the second power supply signal VS, and the other end is connected to the control end of the switching unit 112 (or the output end of the driving unit 113). The second power supply signal VS may be a positive DC voltage signal, for example, +24V. Then, when the output end of the driving unit 113 outputs a low potential, the coil is energized; or, the second power supply signal VS may be a ground signal. Then, when the output end of the driving unit 113 outputs a high potential, the coil is energized; specifically, it can be set according to actual requirements. The relay RELAY1 can be selected as a normally open relay or a normally closed relay as needed.

[0055] The driving unit 113 may include: a second transistor Q2; the control electrode of the second transistor Q2 is connected to a driving control signal SD, the first electrode of the second transistor Q2 is connected to a first power supply signal, and the second electrode of the second transistor Q2 is connected to the control end of the switching unit 112. Among them, the potential of the first power supply signal is different from that of the second power supply signal VS, so that the coil of the relay RELAY1 is energized when the second transistor Q2 is turned on. For example, the first power supply signal is a ground signal GND, and the second power supply signal VS is a +24V DC voltage signal. The second transistor Q2 may be a switchable transistor such as a triode, a MOS transistor, or an IGBT.

[0056] In this embodiment, a driving module 11 is constructed based on a transistor and a relay RELAY1. The on / off of the second transistor Q2 controls whether the coil of the relay RELAY1 is energized, thereby controlling whether the contact switch of the relay RELAY1 is turned on, so as to control the voltage transmitted to the first transistor Q1 and realize the control of the on / off state of the switching module K1.

[0057] Further, the driving unit 113 may further include: a second resistor R2, a third resistor R3, and a first capacitor C1; the first end of the second resistor R2 is connected to the driving control signal SD, and the second end of the second resistor R2 is connected to the control electrode of the second transistor Q2; the third resistor R3 is connected between the control electrode and the first electrode of the second transistor Q2; the first capacitor C1 is connected between the control electrode and the first electrode of the second transistor Q2. Exemplarily, the second transistor Q2 is an NPN triode, the first power supply signal is a ground signal GND, the second resistor R2 can be used as a current limiting resistor, the third resistor R3 can be used as a pull-down resistor, and the first capacitor C1 can be used as a filtering capacitor to ensure the reliability of the circuit.

[0058] On the basis of the above embodiments, optionally, the driving module 11 may further include: a voltage stabilizing unit 114, connected between the second input end of the driving module 11 and the driving output end of the driving module 11. Exemplarily, the voltage stabilizing unit 114 may include a voltage stabilizing diode D3. Taking the second input end of the driving module 11 being connected to the negative electrode of the battery B1 as an example, the anode of the voltage stabilizing diode D3 may be connected to the second input end of the driving module 11, and the cathode may be connected to the driving output end of the driving module 11. The voltage stabilizing value of the voltage stabilizing diode D3 may be set to be equal to the driving voltage value of the first transistor Q1.

[0059] Based on the above embodiments, optionally, the control component may include a control unit of the converter. The switching power supply S1 may be a component in the converter and is used to supply power to the control unit. The control unit may be disposed on the control board of the converter; the control unit is, for example, an MCU (Microcontroller Unit). The control unit is connected to the control end of the driving module 11; the control unit is used to output a driving control signal SD. The control unit is also connected to the battery management system BMS, and the battery management system BMS is used to control the potential of the driving control signal SD output by the control unit. Exemplarily, the battery management system BMS is connected to the battery B1 to monitor the state of charge of the battery B1 in real time. The battery management system BMS may control the output of the control unit according to the state of charge of the battery B1. The battery management system BMS may issue a turn-off control instruction to the control unit when the battery B1 needs to enter the low-power mode, for example, when the energy storage system is on standby and / or the state of charge of the battery B1 is lower than a preset threshold; the control unit may control the potential of the driving control signal SD according to the turn-off control instruction, so that the driving module 11 can control the switching module K1 to turn off according to the potential of the driving control signal SD. The preset threshold may be set according to actual requirements, for example, set to a value between 10% and 20%, to avoid over-discharging of the battery B1.

[0060] With this setting in this embodiment, whether the switching module K1 is turned off can be automatically controlled by the system according to factors such as the battery SOC, and the control process is more intelligent. Exemplarily, the driving module 11 and the control unit may be integrally integrated in the control board of the converter, so that the control unit can provide the driving control signal SD to the driving module 11 and improve the integration degree of the control board. Then, since both the control unit and the driving module 11 are integrated in the control board of the converter, it is equivalent to realizing the transmission of the driving control signal SD inside the control board. Compared with directly using the battery management system BMS to provide the driving control signal SD, it is not necessary to separately add wiring between the battery management system BMS and the driving module 11, simplifying the wiring of the energy storage system. Moreover, the battery management system BMS itself has a connection with the control board of the converter for information interaction with the control unit of the converter. The battery management system BMS can issue a turn-off control instruction to the control unit based on the original connection relationship without the need to separately provide a connection line.

[0061] Next, taking Figure 4 the specific circuit structure in as an example, the working process of this battery low-power control circuit will be described:

[0062] In the off-grid condition, when the energy storage system starts, the voltage across the battery B1 is applied across the circuit formed by three first resistors R1 connected in series with the zener diode D3. At this time, the voltage across the zener diode D3 is the conduction voltage of the first transistor Q1, causing the first transistor Q1 to conduct. Then, the power supply path of the switching power supply S1 is turned on, and it can draw power from the battery B1. The switching power supply S1 starts to work, and the PCS in the energy storage system starts to operate. At this time, the drive control signal SD output by the MCU to the second resistor R2 is at a low potential, causing the second transistor Q2 to turn off, the coil of the relay RELAY1 to lose power, and the contact switch of the relay RELAY1 not to conduct.

[0063] When the battery B1 needs to operate in the low-power mode, the MCU continuously outputs a high-potential drive control signal SD to the second resistor R2, causing the second transistor Q2 to close. The voltage across the coil of the relay RELAY1 is +24V, and the energized coil causes the contact switch of the relay RELAY1 to close. The short circuit between the control electrode and the second electrode of the first transistor Q1 makes the first transistor Q1 non-conductive, cutting off the power supply path from the battery B1 to the switching power supply S1. The battery B1 enters the low-power mode. At this time, the switching power supply S1 can only draw power from the AC side.

[0064] The embodiment of the present invention also provides an energy storage system, including the battery low-power control circuit provided in any embodiment of the present invention, and having corresponding beneficial effects. Exemplarily, the energy storage system may include: a battery, a switching power supply, a control component, and a battery low-power control circuit.

[0065] The above specific implementation manners do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A battery low power consumption control circuit, characterized in that: include: A switch module, connected between the battery and the switching power supply of the energy storage system; The switching power supply is used to supply power to the control components in the energy storage system; The switch module is used to switch on or off according to the potential of the control terminal of the switch module; Driver module; The control end of the driving module is connected to a driving control signal; one of the first input end and the second input end of the driving module is connected to the positive electrode of the battery, and the other is connected to the negative electrode of the battery; the driving output end of the driving module is connected to the control end of the switch module; the driving module is used to control the first input end or the second input end to be connected to the driving output end according to the driving control signal.

2. The battery low power consumption control circuit according to claim 1, characterized in that: The switch module comprises: a first transistor; The control electrode of the first transistor is connected to the control end of the switch module, the first electrode of the first transistor is connected to the switch power supply, and the second electrode of the first transistor is connected to the battery.

3. The battery low power consumption control circuit according to claim 1, characterized in that: The driving module comprises: A current limiting unit, wherein a first end of the current limiting unit is connected to a first input end of the driving module, and a second end of the current limiting unit is connected to a driving output end of the driving module; A switch unit, wherein a first end of the switch unit is connected to the second input end of the driving module, and a second end of the switch unit is connected to the driving output end of the driving module; the switch unit is used to turn on or off according to the potential of the control end of the switch unit; A driving unit, wherein the control end of the driving unit is connected to the driving control signal, and the output end of the driving unit is connected to the control end of the switch unit; the driving unit is used to control the potential transmitted to the control end of the switch unit according to the driving control signal.

4. The battery low power consumption control circuit according to claim 3, characterized in that: The current limiting unit includes: at least one first resistor connected between the first input terminal of the driving module and the driving output terminal of the driving module; And / or, the switch unit comprises: a relay; a contact switch of the relay is connected between the second input terminal of the driving module and the driving output terminal of the driving module, and a coil of the relay is connected to the control terminal of the switch unit; And / or, the driving unit comprises: a second transistor; a control electrode of the second transistor is connected to the driving control signal, a first electrode of the second transistor is connected to the first power supply signal, and a second electrode of the second transistor is connected to the control end of the switch unit; And / or, the driving module further includes: a voltage stabilizing unit connected between the second input terminal of the driving module and the driving output terminal of the driving module.

5. The battery low power consumption control circuit according to claim 4, characterized in that: The driving unit also includes: a second resistor, a third resistor and a first capacitor; the first end of the second resistor is connected to the driving control signal, and the second end of the second resistor is connected to the control electrode of the second transistor; the third resistor is connected between the control electrode and the first electrode of the second transistor; and the first capacitor is connected between the control electrode and the first electrode of the second transistor.

6. The battery low power consumption control circuit according to claim 1, characterized in that: The first connection end of the switch module is connected to the first end of the switch power supply, the second connection end of the switch module is connected to the first pole of the battery, and the second end of the switch power supply is connected to the second pole of the battery; Among them, the first end of the switching power supply is a positive power supply end, the second end of the switching power supply is a negative power supply end, the first pole of the battery is a positive pole, and the second pole of the battery is a negative pole; or, the first end of the switching power supply is a negative power supply end, the second end of the switching power supply is a positive power supply end, the first pole of the battery is a negative pole, and the second pole of the battery is a positive pole.

7. The battery low power consumption control circuit according to claim 6, characterized in that: Also includes: A first anti-reverse connection module is connected between the first end of the switching power supply and the first connection end of the switching module; and / or a second anti-reverse connection module is connected between the second end of the switching power supply and the second pole of the battery.

8. The battery low power consumption control circuit according to any one of claims 1 to 7, characterized in that: Also includes: The rectifier module is connected between the mains and the switching power supply.

9. The battery low power consumption control circuit according to any one of claims 1 to 7, characterized in that: The control component includes a control unit of the converter; the control unit is connected to the control end of the drive module; the control unit is used to output the drive control signal; The control unit is also connected to a battery management system; the battery management system is used to control the potential of the drive control signal output by the control unit.

10. An energy storage system, characterized in that: include: A battery, a switching power supply, a control component, and a battery low power consumption control circuit as claimed in any one of claims 1 to 9.

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