Charging and discharging control circuit of energy storage equipment and energy storage equipment

Abstract

The utility model discloses a charging and discharging control circuit of energy storage equipment and the energy storage equipment, and the circuit comprises a first grounding capacitor, one end of the first grounding capacitor is grounded, and the other end of the first grounding capacitor is connected with a live line or a zero line of the charging and discharging control circuit; two ends of the bus capacitor are respectively connected with a live wire and a zero wire of the charging and discharging control circuit; and the pre-charging circuit comprises a first switch piece, and the first switch piece is used for connecting or disconnecting the connection between the charging interface and the bus capacitor. The pre-charging circuit can charge the bus capacitor, the first switch piece is arranged on the pre-charging circuit, the first switch piece can disconnect the charging interface and the bus capacitor (for example, the first switch piece is disconnected after the bus capacitor is charged), the situation that reverse leakage current occurs in the bus capacitor, and consequently the voltage of the grounding terminal rises can be avoided, and the use safety of the energy storage equipment is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, more particularly, to a charging and discharging control circuit of energy storage device and energy storage device. BACKGROUND

[0002] At present, in the control circuit of bidirectional inverter of the energy storage device, the voltage across the bus capacitor will reach the rated value when the bus capacitor is fully charged. During the charging and discharging process of the energy storage device, the bus capacitor smoothes the voltage fluctuation by controlling the stored charge, thereby improving the system stability of the energy storage device.

[0003] However, during the operation of the bus capacitor, there may be a reverse leakage current, which will cause the voltage at the charging input end of the control circuit to rise, thereby affecting the use safety of the energy storage device. CONTENT OF THE INVENTION

[0004] Therefore, the present application provides a charging and discharging control circuit of energy storage device and energy storage device, which can reduce the voltage at the charging input end of the control circuit and improve the use safety of the energy storage device.

[0005] The charging and discharging control circuit of the energy storage device of the present application comprises: a first grounding capacitor, one end of which is grounded, and the other end of which is connected to the live wire or the zero wire of the charging and discharging control circuit; a bus capacitor, two ends of which are respectively connected to the live wire and the zero wire of the charging and discharging control circuit; and a pre-charging circuit, which comprises a first switch component for turning on or off the connection between the charging interface and the bus capacitor.

[0006] In some embodiments, it further comprises: an inverter input circuit, which comprises a second switch component for turning on or off the connection between the charging interface and the bus capacitor, and the connection between the charging interface and the energy storage module of the energy storage device; and an inverter output circuit, which is connected to the inverter input circuit, and comprises a third switch component for turning on the connection between the energy storage module and the AC power supply interface.

[0007] In some embodiments, when the energy storage device is charging, the second switch component is turned on, and the third switch component is turned off; and when the energy storage device is discharging, the second switch component is turned off, and the third switch component is turned on.

[0008] In some embodiments, when the energy storage device is charging, the first switch component is turned on; and when the energy storage device is discharging, the first switch component is turned off.

[0009] In some embodiments, the inverter input circuit further comprises a second ground capacitor and a filter capacitor, and the inverter output circuit further comprises a third ground capacitor, which is located between the third switching element and the AC power supply interface.

[0010] In some embodiments, the auxiliary power supply circuit is connected at one end to the second switching element and the third switching element, and at the other end to the bus capacitor, and is used to supply power to the second switching element and the third switching element.

[0011] In some embodiments, the power factor correction circuit is used for bidirectional rectification between AC and DC, and is located between the bus capacitor and the first ground capacitor.

[0012] In some embodiments, the energy storage module of the energy storage device is arranged between the power factor correction circuit and the bus capacitor of the charge and discharge control circuit.

[0013] In some embodiments, the pre-charge circuit comprises a rectifier, the rectifier comprises an AC input end and a DC output end, the AC input end is connected to the charging interface, and the DC output end is connected to the bus capacitor.

[0014] In some embodiments, the pre-charge circuit further comprises a current limiting device, which is located between the charging interface and the bus capacitor, and is used to limit the current of the pre-charge circuit to below a preset current.

[0015] The energy storage device of the embodiments of the present application comprises an energy storage module and a charge and discharge control circuit of the energy storage device according to any one of the embodiments described above.

[0016] The charge and discharge control circuit of the energy storage device and the energy storage device of the embodiments of the present application comprise a first ground capacitor, a bus capacitor and a pre-charge circuit, one end of the first ground capacitor is grounded, and the other end is connected to the live wire or the neutral wire of the charge and discharge control circuit, the bus capacitor is connected to the live wire and the neutral wire of the charge and discharge control circuit at both ends, and the pre-charge circuit comprises a first switching element, which is used to turn on or turn off the connection between the charging interface and the bus capacitor. The pre-charge circuit can charge the bus capacitor. By arranging the first switching element in the pre-charge circuit, the first switching element can disconnect the connection between the charging interface and the bus capacitor (for example, disconnect after the bus capacitor is fully charged), which can avoid reverse leakage current of the bus capacitor, cause the ground end voltage to rise, and improve the use safety of the energy storage device.

[0017] Additional aspects and advantages of the embodiments of the present application will be set forth in part in the description that follows, and in part will be obvious from the description, or can be learned by practice of the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the description of the embodiments, taken in conjunction with the following drawings:

[0019] Figure 1 is the application scenario of the charge-discharge control circuit of the energy storage device in some embodiments of the present application in the energy storage device;

[0020] Figure 2 is the principle schematic diagram of the charge-discharge control circuit of the energy storage device in some embodiments of the present application. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, wherein the same or similar notations are used to denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below are exemplary and are intended to explain the embodiments of the present application, but cannot be understood as limiting the embodiments of the present application.

[0022] In the present application, unless explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0023] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one feature. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, unless explicitly specified and limited.

[0024] The bus capacitor in the control circuit of the bidirectional inverter of the energy storage device can reach the rated voltage at both ends in the case of full charge. During the charging and discharging process of the energy storage device, the bus capacitor smoothes the voltage fluctuation by controlling the stored charge, and improves the system stability of the energy storage device.

[0025] However, during the operation of the bus capacitor, there may be a reverse leakage current, which causes the voltage of the charging input end of the control circuit to rise, thereby affecting the safe use of the energy storage device.

[0026] Therefore, the application provides a charging and discharging control circuit of an energy storage device.

[0027] As shown in Figure 1 , the charging and discharging control circuit 100 of the energy storage device 1000 is provided. Figure 1 The external power supply connected to the energy storage device 1000 to charge the energy storage device 1000 includes, but is not limited to, alternating current (power grid), power generation equipment (for example, photovoltaic power generation equipment, alternating current power generation equipment, etc.). For the convenience of description, in the embodiments of the application, the external power supply connected to the energy storage device 1000 is taken as an example of the alternating current (power grid) for description.

[0028] As shown in Figure 2 , the charging and discharging control circuit 100 of the energy storage device 1000 includes:

[0029] The first grounding capacitor 10 has one end grounded and the other end connected to the live wire or the zero wire of the charging and discharging control circuit 100.

[0030] The bus capacitor 20 has two ends respectively connected to the live wire and the zero wire of the charging and discharging control circuit 100.

[0031] The pre-charging circuit 30 includes a first switch 31 for turning on or off the connection between the charging interface 40 and the bus capacitor 20.

[0032] The first grounding capacitor 10 can be a Y capacitor (a safety capacitor for suppressing common-mode interference in a circuit), and the first grounding capacitor 10 can include one or more. The first grounding capacitor 10 has one end grounded and the other end connected to the live wire or the zero wire of the charging and discharging control circuit 100. For example, as shown in Figure 2 , the first grounding capacitor 10 can include two first grounding capacitors 11 and 12, the first grounding capacitor 11 has one end grounded and the other end connected to the live wire (L line) of the charging and discharging control circuit 100, and the first grounding capacitor 12 has one end grounded and the other end connected to the zero wire (N line) of the charging and discharging control circuit 100.

[0033] Optionally, the grounding end of the energy storage device 1000 includes a metal backplane, the first grounding capacitor 10 has one end connected to the metal backplane and the other end connected to the live wire or the zero wire of the charging and discharging control circuit 100.

[0034] The bus capacitor 20 can be a capacitor connected to the bus (a main conductor for connecting and distributing power) of the charge-discharge control circuit 100. The bus capacitor 20 can help balance the voltage of the charge-discharge control circuit 100, reduce voltage fluctuations in the circuit, improve circuit stability, and the like.

[0035] The charge-discharge control circuit 100 includes a charging interface 40, and the charge-discharge control circuit 100 can connect to the mains through the charging interface 40 to charge the energy storage device 1000. The charging interface 40 is connected to the first grounding capacitor 10, and the first grounding capacitor 10 can suppress electromagnetic interference. For example, please refer to Figure 2 The charge-discharge control circuit 100 includes a charging interface 40, and the charging interface 40 includes a first charging interface 41 and a second charging interface 42. The first charging interface 41 is connected to the hot line (L line) of the mains, and the second charging interface 42 is connected to the neutral line (N line) of the mains.

[0036] The pre-charge circuit 30 includes a first switch 31. When the first switch 31 is closed, the charging interface 40 and the bus capacitor 20 are connected, and the power of the mains can flow into the pre-charge circuit 30 through the charging interface 40 to charge the bus capacitor 20.

[0037] Specifically, the energy storage device 1000 is provided with a pre-charge circuit 30, which can connect the charging interface 40 and the bus capacitor 20. Before charging the energy storage device 1000, the bus capacitor 20 can be charged through the pre-charge circuit 30 first, to raise the voltage of the bus capacitor 20, and avoid the problem that the charge-discharge control circuit 100 appears a sharp current due to the charging of the bus capacitor 20 during charging, and damages the circuit elements in the charge-discharge control circuit 100. However, in the case of discharging the energy storage device 1000, the bus capacitor 20 is in a charged state. At this time, the bus capacitor 20 can have a reverse leakage current, that is, the current can be transmitted in the reverse direction through the bus capacitor 20 to the pre-charge circuit 30, and then to the charging interface 40. In addition, the first grounding capacitor 10 is also provided at the hot line or neutral line end of the charge-discharge control circuit 100. Therefore, after the reverse leakage current of the bus capacitor 20 flows to the first grounding capacitor 10, the voltage of the ground end of the energy storage device 1000 will be raised due to the grounding of one end of the first grounding capacitor 10, which will cause the voltage of the ground end to be greater than the safety requirement (36 volts (V) of alternating voltage, 42V of direct current), and reduce the safety of the energy storage device 1000 in use, and increase the risk of use of the energy storage device 1000.

[0038] Therefore, by providing the first switch 31 in the pre-charge circuit 30, the first switch 31 can be disconnected after the bus capacitor 20 is fully charged, to avoid the voltage of the ground end being raised after the bus capacitor 20 is fully charged, and improve the safety of the energy storage device 1000 in use.

[0039] Referring to Figure 2 Optionally, the charge-discharge control circuit 100 further comprises:

[0040] The inverter input circuit 50 comprises a second switch component 51, which is used to turn on or turn off the connection between the charging interface 40 and the bus capacitor 20, and the connection between the charging interface 40 and the energy storage module 90 of the energy storage device 1000.

[0041] The inverter output circuit 60 is connected with the inverter input circuit 50, and the inverter input circuit 50 comprises a third switch component 61, which is used to turn on the energy storage module 90 and the alternating current power supply interface 62.

[0042] The inverter input circuit 50 is connected with the charging interface 40, and is used to receive alternating current input from the charging interface 40 and deliver the alternating current to the energy storage module 90 for storage. The inverter input circuit 50 can also deliver the alternating current to the bus capacitor 20. In the case that the second switch component 51 is closed, the connection between the charging interface 40 and the bus capacitor 20, and the connection between the charging interface 40 and the energy storage module 90 of the energy storage device 1000 are turned on. The second switch component 51 can comprise a first second switch component and a second second switch component. The first second switch component is used to turn on or turn off the connection between the charging interface 40 and the bus capacitor 20, and the connection between the charging interface 40 and the energy storage module 90 of the energy storage device 1000 on the live line. The second second switch component is used to turn on or turn off the connection between the charging interface 40 and the bus capacitor 20, and the connection between the charging interface 40 and the energy storage module 90 of the energy storage device 1000 on the neutral line.

[0043] The inverter input circuit 50 further comprises a second grounding capacitor 52 and a filter capacitor 53, and the inverter output circuit 60 further comprises a third grounding capacitor 63, which is located between the third switch component 61 and the alternating current power supply interface 62.

[0044] In the case that the third switch component 61 is closed, the connection between the energy storage module 90 and the alternating current power supply interface 62 is turned on. The inverter output circuit 60 can output the electrical energy stored in the energy storage module 90 to the load through the alternating current power supply interface 62 for use by the load.

[0045] In the case that the energy storage device 1000 is charging, the second switch component 51 is turned on and the third switch component 61 is turned off. In the case that the energy storage device 1000 is discharging, the second switch component 51 is turned off and the third switch component 61 is turned on.

[0046] In the case that the energy storage device 1000 is charging, the first switch component 31 is turned on. In the case that the energy storage device 1000 is discharging, the first switch component 31 is turned off.

[0047] The second ground capacitor 52 and the third ground capacitor can be Y capacitors.

[0048] The filter capacitor 53 can be an X capacitor, which can filter the differential mode interference of the charge-discharge control circuit 100.

[0049] Specifically, since the first ground capacitor 10 can be a Y capacitor (a safety capacitor for suppressing common mode interference in a circuit), in the case where multiple Y capacitors are provided in the charge-discharge control circuit 100 and the multiple Y capacitors are connected to the same ground terminal, the multiple Y capacitors can achieve voltage coupling based on the ground terminal. That is, assuming that there are two lines in the control circuit, both of which are provided with Y capacitors and the Y capacitors of the two lines are connected to the same ground terminal, in the case where one line is live and the other line is not live, the Y capacitor of the live line can couple current through the ground terminal to the other non-live line, so that a certain voltage appears on the non-live line. Such coupling is commonly referred to as capacitive coupling or common mode coupling.

[0050] In the case where the energy storage device 1000 is discharging, if the first switch 31 and the third switch 61 are closed and the second switch 51 is open, the current of the energy storage module 90 passes through the bus capacitor 20, the second ground capacitor 52 and the third switch 61 in turn, and then supplies power to the load through the AC power supply interface 62. Since the bus capacitor 20 has a reverse leakage current, the current can also be transmitted from the positive terminal of the bus capacitor 20 to the first ground capacitor 10 through the pre-charge circuit 30, and the first ground capacitor 10 and the second ground capacitor 52 can be coupled. Therefore, in the case where the energy storage device 1000 is discharging, although the second switch 51 is open and the inverter input circuit 50 is theoretically not live, due to the capacitive coupling characteristics of the Y capacitors, the following live loop can be formed: the reverse leakage current of the positive terminal of the bus capacitor 20 can flow to the charging interface 40 and the first ground capacitor 10 through the pre-charge circuit 30, and based on the coupling of the first ground capacitor 10 and the second ground capacitor 52, it eventually returns to the positive terminal of the bus capacitor 20. Since the first ground capacitor 10 and the second ground capacitor 52 are both grounded, the formation of the live loop will cause the voltage at the ground terminal to further increase. Therefore, in the case where the energy storage device 1000 is discharging, the third switch 61 can be closed and the first switch 31 and the second switch 51 can be opened to reduce the current on the charging interface 40 and the inverter input circuit 50 by switching the live loop, thereby reducing the voltage at the ground terminal, the charging interface 40 and the inverter input circuit 50.

[0051] When the energy storage device 1000 is discharged, the third grounding capacitor 63 is also charged and can be coupled with the first grounding capacitor 10. Therefore, the following charged loop is formed (taking the example of one end of the third grounding capacitor 63 connected to the live wire of the charge and discharge control circuit 100 and the other end being grounded): Based on the coupling between the third grounding capacitor 63 and the first grounding capacitor 10, the first grounding capacitor 10 will be charged, and the current will then pass through the driving circuit of the energy storage device 1000 (such as Figure 2 The driving circuit 64 and sampling circuit 65 in the circuit) and the inverter output circuit 60 return to the third grounding capacitor 63. Therefore, the voltage at the ground terminal can be further reduced by changing the capacitance of the third grounding capacitor 63 and / or the first grounding capacitor 10 (for example, by reducing the capacitance of the third grounding capacitor 63 to increase the capacitive reactance of the third grounding capacitor 63 and reduce the loop current; or by increasing the capacitance of the first grounding capacitor 10 to reduce the capacitive reactance of the first grounding capacitor 10, thereby reducing the coupling voltage between the first grounding capacitor 10 and the third grounding capacitor 63), or by increasing the resistance of the driving circuit to reduce the leakage current and lower the loop voltage.

[0052] In some embodiments, the charge and discharge control circuit 100 further includes:

[0053] The auxiliary power supply circuit 70 has one end connected to the second switch element 51 and the third switch element 61 and the other end connected to the bus capacitor 20 . The auxiliary power supply circuit 70 is used to supply power to the second switch element 51 and the third switch element 61 .

[0054] Specifically, by setting up an auxiliary power supply circuit 70, one end of the auxiliary power supply circuit 70 is connected to the second switch element 51 and the third switch element 61, and the other end is connected to the bus capacitor 20. When the voltage of the bus capacitor 20 is greater than a preset threshold (for example, 50%, 60%, 70%, 80%, 90%, etc. of the rated voltage of the bus capacitor 20), the AC power input through the charging interface 40 can be used to power the power supply circuit, so that the power supply circuit can control the closing or opening of the second switch element 51 and the third switch element 61.

[0055] Optionally, the pre-charging circuit 30 further includes:

[0056] The rectifier 32 includes an AC input terminal and a DC output terminal. The AC input terminal is connected to the charging interface 40 , and the DC output terminal is connected to the bus capacitor 20 .

[0057] The rectifier 32 includes an AC input and a DC output. The AC input is connected to the charging interface 40, and the DC output is connected to the bus capacitor 20. When the charging interface 40 is connected to the mains, AC power flows through the charging interface 40 to the AC input of the rectifier 32. After being rectified into DC power by the rectifier 32, it flows from the DC output to the bus capacitor 20 to charge the bus capacitor 20, thereby reducing the high current impact on the bus capacitor 20 when the second switch 51 is closed.

[0058] Optionally, the pre-charging circuit 30 further includes a current limiting device 33 , which is located between the charging interface 40 and the bus capacitor 20 , and is used to limit the current of the pre-charging circuit 30 to below a preset current.

[0059] The current limiting device 33 includes at least one of a resistor and an inductor (eg, a chip inductor).

[0060] Specifically, the current limiting device 33 may include a first current limiting device 33 (eg Figure 2 RT1) and the second current limiting device 33 (such as Figure 2 In the figure, RT2), the first end of the bus capacitor 20 is connected to the positive electrode of the DC output terminal, the first current limiting device 33 is located between the first end of the bus capacitor 20 and the positive electrode of the DC output terminal, the second end of the bus capacitor 20 is connected to the negative electrode of the DC output terminal, and the second current limiting device 33 is located between the second end of the bus capacitor 20 and the negative electrode of the DC output terminal to limit the current flowing to the bus capacitor 20, further improve the stability of the pre-charging circuit 30, and thus improve the stability of the charging and discharging circuit.

[0061] In some embodiments, the charge and discharge control circuit 100 further includes:

[0062] The power factor correction circuit 80 is used for bidirectional rectification between AC power and DC power; the power factor correction circuit 80 is located between the bus capacitor 20 and the first grounding capacitor 10.

[0063] The energy storage module 90 of the energy storage device 1000 is arranged between the power factor correction circuit of the charge and discharge control circuit 100 and the bus capacitor 20 .

[0064] The power factor correction circuit (PFC circuit 80) can improve the utilization rate of electric energy of the energy storage device 1000. The PFC circuit 80 can also rectify AC power into DC power and rectify DC power into AC power.

[0065] Specifically, in the case of charging the energy storage device 1000, the PFC circuit 80 can rectify the alternating current input by the inverter input circuit 50 into direct current to charge the bus capacitor 20 and store in the energy storage module 90; in the case of discharging the energy storage device 1000, the PFC circuit 80 can rectify the direct current output by the energy storage module 90 into alternating current and output to the load through the inverter output circuit 60.

[0066] Please refer again to Figure 2 The energy storage device 1000 of the embodiments of the present application includes the charge and discharge control circuit 100 of the energy storage device 1000 of any of the above embodiments.

[0067] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0068] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A charge and discharge control circuit for an energy storage device, characterized in that: include: a first grounding capacitor, one end of which is grounded and the other end of which is connected to a live wire or a neutral wire of the charge and discharge control circuit; A bus capacitor, with two ends of the bus capacitor respectively connected to the live wire and the neutral wire of the charge and discharge control circuit; A pre-charging circuit includes a first switch element, and the first switch element is used to connect or disconnect the connection between the charging interface and the bus capacitor.

2. The charge and discharge control circuit of the energy storage device according to claim 1, characterized in that: Also includes: an inverter input circuit, the inverter input circuit comprising a second switch element, the second switch element being used to connect or disconnect the connection between the charging interface and the bus capacitor, and between the charging interface and the energy storage module of the energy storage device; An inverter output circuit is connected to the inverter input circuit. The inverter input circuit includes a third switch component, and the third switch component is used to conduct the energy storage module and the AC power supply interface.

3. The charge and discharge control circuit of the energy storage device according to claim 2, characterized in that: When the energy storage device is charging, the second switch is turned on and the third switch is turned off; when the energy storage device is discharging, the second switch is turned off and the third switch is turned on.

4. The charge and discharge control circuit of the energy storage device according to claim 3, characterized in that: When the energy storage device is charged, the first switch is turned on; when the energy storage device is discharged, the first switch is turned off.

5. The charge and discharge control circuit of the energy storage device according to claim 2, characterized in that: The inverter input circuit further includes a second grounding capacitor and a filter capacitor, and the inverter output circuit further includes a third grounding capacitor, which is located between the third switch element and the AC power supply interface.

6. The charge and discharge control circuit of the energy storage device according to claim 2, characterized in that: Also includes: An auxiliary power supply circuit, one end of which is connected to the second switch component and the third switch component, and the other end is connected to the bus capacitor, and the auxiliary power supply circuit is used to supply power to the second switch component and the third switch component.

7. The charge and discharge control circuit of the energy storage device according to claim 1, characterized in that: Also includes: A power factor correction circuit is used for bidirectional rectification between alternating current and direct current; the power factor correction circuit is located between the bus capacitor and the first grounding capacitor.

8. The charge and discharge control circuit of the energy storage device according to claim 7, characterized in that: The energy storage module of the energy storage device is arranged between the power factor correction circuit of the charge and discharge control circuit and the bus capacitor.

9. The charge and discharge control circuit of the energy storage device according to claim 1, characterized in that: The pre-charging circuit includes a rectifier, and the rectifier includes an AC input end and a DC output end. The AC input end is connected to the charging interface, and the DC output end is connected to the bus capacitor.

10. The charge and discharge control circuit of the energy storage device according to claim 1 or 9, characterized in that: The pre-charging circuit further includes a current limiting device, which is located between the charging interface and the bus capacitor, and is used to limit the current of the pre-charging circuit to below a preset current.

11. An energy storage device, characterized in that: include: Energy storage module; and The charge and discharge control circuit according to any one of claims 1 to 10.

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