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. The charging and discharging control circuit comprises a charging interface; a bus capacitor; the inversion input circuit comprises a first switch piece and a first filter capacitor, the first switch piece is used for connecting or disconnecting the charging interface and the bus capacitor, the first filter capacitor is connected with the first switch piece, and the first switch piece is located between the charging interface and the first filter capacitor; and the pre-charging circuit comprises a rectifier, the rectifier comprises an alternating current input end and a direct current output end, the alternating current input end is connected with the charging interface, and the direct current output end is connected with the bus capacitor. The large current impact on the bus capacitor can be reduced when the first switch piece is closed, and the service life of the bus capacitor is prolonged; the current impact stress on the first switch piece is reduced, the first switch piece is prevented from being damaged, and the service life of the first switch piece is prolonged.

Description

TECHNICAL FIELD

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

[0002] At present, in the control circuit of bidirectional inversion, at the moment when the switch (for example, a relay) of the control circuit is closed, the charging current of the external input power supply (for example, a power grid) charging the X capacitor of the control circuit can be greater than the rated current value that the relay can withstand, thereby causing an impact on the contact of the relay, and further reducing the service life of the relay, and even damaging the relay. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the charging and discharging control circuit of energy storage equipment and the energy storage equipment provided by the embodiments of the present application can avoid the current impact on the relay at the moment when the relay is closed, avoid damaging the relay, and improve the service life of the relay.

[0004] The charging and discharging control circuit of energy storage equipment provided by the present application comprises a charging interface, a bus capacitor, an inversion input circuit, a pre-charging circuit, and a relay.

[0005] In some embodiments, the pre-charging 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-charging circuit to below a preset current.

[0006] In some embodiments, the current limiting device comprises at least one of a resistor and an inductor.

[0007] In some embodiments, the current limiting device comprises a first current limiting device and a second current limiting device, a first end of the bus capacitor and a positive electrode of the direct current output end are connected, the first current limiting device is located between the first end of the bus capacitor and the positive electrode of the direct current output end, a second end of the bus capacitor and a negative electrode of the direct current output end are connected, and the second current limiting device is located between the second end of the bus capacitor and the negative electrode of the direct current output end.

[0008] In some embodiments, the first switch includes a relay, the relay includes a first relay and a second relay, the first relay is located at a live wire of the charge-discharge control circuit, and the second relay is located at a zero wire of the charge-discharge control circuit.

[0009] In some embodiments, the charge-discharge control circuit further includes a power factor correction circuit, the power factor correction circuit is used for bidirectional rectification between alternating current and direct current, the power factor correction circuit is located between the direct current output end and the first switch, the power factor correction circuit includes a second switch, the second switch is used for turning on or off the connection between the direct current output end and the first switch, and the second switch is turned off when the charging interface accesses an external power supply.

[0010] In some embodiments, the second switch includes a diode.

[0011] In some embodiments, the charge-discharge control circuit of the energy storage device further includes a second filter capacitor, and the second filter capacitor is located between the first filter capacitor and the power factor correction circuit.

[0012] In some embodiments, the charge-discharge control circuit of the energy storage device further includes an inverter output circuit, the inverter output circuit is connected to the inverter input circuit, the first switch is further used for turning on the connection between the inverter output circuit and the inverter input circuit, and the inverter output circuit includes a third switch, the third switch is used for turning on or off the connection between the inverter output circuit and a power supply interface.

[0013] The energy storage device of the embodiments of the present application includes the charge-discharge control circuit of the energy storage device in any of the above embodiments.

[0014] The charging and discharging control circuit of the energy storage device and the energy storage device of the embodiments of the present application, the charging and discharging control circuit of the energy storage device comprises a charging interface, a bus capacitor, an inverter input circuit and a pre-charging circuit, the inverter input circuit comprises a first switch and a first filter capacitor, the first switch is used to turn on or turn off the connection between the charging interface and the bus capacitor, the first filter capacitor is connected to the first switch, and the first switch is located between the charging interface and the first filter capacitor, and the pre-charging circuit comprises a rectifier, the rectifier comprises an alternating current input end and a direct current output end, the alternating current input end is connected to the charging interface, and the direct current output end is connected to the bus capacitor. The pre-charging circuit can charge the bus capacitor and the first filter capacitor before the first switch is closed, so as to reduce the large current impact on the bus capacitor and increase the service life of the bus capacitor; and the pre-charging circuit charges the first filter capacitor before the first switch is closed, that is, the voltage of the first filter capacitor is raised by the pre-charging circuit, and then the first switch is closed, so as to reduce the voltage change rate on the first filter capacitor, to reduce the current impact force brought by the power supply charging the first filter capacitor through the inverter input circuit, to avoid the damage of the peak current (surge peak current) generated by the first filter capacitor to the first switch, to reduce the current impact stress on the first switch, and to improve the service life of the first switch.

[0015] Additional aspects and advantages of the embodiments of the present application will be in part apparent and in part pointed out hereinafter in the description of the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] 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 in which:

[0017] Figure 1 is an application scene diagram of the charging and discharging control circuit of the energy storage device in some embodiments of the present application in the energy storage device;

[0018] Figure 2 is a principle schematic diagram of the charging and discharging control circuit of the energy storage device in some embodiments of the present application. DETAILED DESCRIPTION

[0019] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below are exemplary and are only used to explain the embodiments of the present application, and cannot be understood as a limitation on the embodiments of the present application.

[0020] In the present application, unless specifically and expressly defined otherwise, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be "above", "over" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature can be "below", "under" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0021] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "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 otherwise specifically and expressly limited.

[0022] The control logic of the bidirectional inverter is more complex than other traditional switching power supplies. A reasonable control strategy is crucial to the function and performance of the bidirectional inverter, which can reduce the voltage and current stress on the devices in the circuit, protect the devices, avoid device damage, and prolong the service life of the devices.

[0023] Currently, in the control circuit of the bidirectional inverter, a one-stage or two-stage π-type filter circuit is generally arranged at the input end of the circuit to suppress the electromagnetic interference (EMI) of the common-mode interference, differential-mode interference, noise, etc. of the grid input end to the switching power supply. The filter circuit generally includes an X capacitor (a capacitor used to suppress the differential-mode interference of the power supply electromagnetic), and the capacity of the selected X capacitor is in a positive correlation with the output power of the bidirectional inverter in the control circuit. That is, as the output power of the bidirectional inverter increases, the capacity of the selected X capacitor will also increase accordingly.

[0024] And at the moment when the switch (for example, a relay) of the circuit is closed, the external alternating current input power supply (for example, the grid) will charge the X capacitor with a relatively large impact current (the X capacitor will cause a large impact current), and the contacts of the relay need to withstand the large instantaneous current, resulting in that the instantaneous current stress of the relay causes a large impact on the relay, and the long-time impact current reduces the reliability of the relay, reduces the service life of the relay, and even damages the relay.

[0025] Therefore, the present application provides a charge and discharge control circuit of an energy storage device.

[0026] Please refer to Figure 1The embodiment of the present application provides a charging and discharging control circuit 100 of an energy storage device 1000, as shown in the figure. Figure 1 The energy storage device 1000 includes the charging and discharging control circuit 100. The external power supply connected with 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 embodiment of the present application, the external power supply connected with the energy storage device 1000 is taken as an example for description.

[0027] Please refer to Figure 2 The charging and discharging control circuit 100 of the energy storage device 1000 includes:

[0028] a charging interface 10;

[0029] a bus capacitor 20;

[0030] an inverter input circuit 30, the inverter input circuit 30 includes a first switch component 31 and a first filter capacitor 32, the first switch component 31 is used for turning on or turning off the connection between the charging interface 10 and the bus capacitor 20, the first filter capacitor 32 is connected with the first switch component 31, and the first switch component 31 is located between the charging interface 10 and the first filter capacitor 32;

[0031] a pre-charge circuit 40, the pre-charge circuit 40 includes a rectifier 41, the rectifier 41 includes an alternating current input end and a direct current output end, the alternating current input end is connected with the charging interface 10, and the direct current output end is connected with the bus capacitor 20.

[0032] The energy storage device 1000 is connected with the power grid through the charging interface 10 to charge. For example, please refer to Figure 2 The charging and discharging control circuit 100 includes the charging interface 10, the charging interface 10 includes a first charging interface 11 and a second charging interface 12, the first charging interface 11 is connected with a live line (L line) of the power grid, and the second charging interface 12 is connected with a neutral line (N line) of the power grid.

[0033] As shown in the figure, Figure 2 The bus capacitor 20 can be a capacitor connected to a bus (main conductor for connection and distribution of power) of the charging and discharging control circuit 100. The bus capacitor 20 can help balance the voltage of the charging and discharging control circuit 100, reduce the voltage fluctuation in the circuit, improve the stability of the circuit, etc.

[0034] The inverter input circuit 30 is connected with the charging interface 10 and is used for receiving alternating current input from the charging interface 10.

[0035] The first filter capacitor 32 can include an X capacitor and can be used for suppressing differential mode interference in the charging and discharging control circuit 100.

[0036] Optionally, the first switch 31 comprises a relay, and the relay comprises a first relay 311 and a second relay 312, the first relay 311 is located at the L line of the charge-discharge control circuit 100, and the second relay 312 is located at the N line of the charge-discharge control circuit 100.

[0037] The first relay 311 is arranged on the L line of the charge-discharge control circuit 100, and controls the conduction or disconnection of the charging interface 10 and the bus capacitor 20 on the L line; the second relay 312 is arranged on the N line of the charge-discharge control circuit 100, and controls the conduction or disconnection of the charging interface 10 and the bus capacitor 20 on the N line.

[0038] The first relay 311 and the second relay 312 can be normally open relays. Since the first relay 311 and the second relay 312 are normally open and not closed, when the charging interface 10 is connected to the mains, the voltage input from the charging interface 10 can only flow to the third filter capacitor CX1 and the common mode inductor L1 (used to suppress common mode interference in the circuit).

[0039] The pre-charge circuit 40 is connected between the charging interface 10 and the bus capacitor 20, and can be used to charge the bus capacitor 20.

[0040] The rectifier 41 can be used to rectify alternating current to direct current, for example, the rectifier 41 can be a bridge stack or the like. The rectifier 41 is connected to the live line and the neutral line of the mains, and the alternating current can be rectified to direct current after passing through the rectifier 41. The bus capacitor 20 has one end connected to the positive pole of the direct current output end and one end connected to the negative pole of the direct current output end, so that the direct current output through the direct current output end charges the bus capacitor 20.

[0041] Specifically, please refer to Figure 2 The charge-discharge control circuit 100 of the energy storage device 1000 comprises a charging interface 10, a bus capacitor 20, an inverter input circuit 30 and a pre-charge circuit 40. The bus capacitor 20 has one end connected to the L line of the mains and one end connected to the N line of the mains, and the bus capacitor 20 is grounded. The inverter input circuit 30 comprises a first switch 31 and a first filter capacitor 32, and the connection between the charging interface 10 and the bus capacitor 20 is conducted when the first switch 31 is closed. The first switch 31 is arranged between the charging interface 10 and the first filter capacitor 32, that is, the closing and opening of the first switch 31 does not affect the connection between the first filter capacitor 32 and the bus capacitor 20.

[0042] Please refer to Figure 2, the charging interface 10 is connected to the mains to receive the alternating current, and the alternating current flows through the charging interface 10 to the inverter input circuit 30. When the first switch 31 is closed, the current flows through the first switch 31 and the first filter capacitor 32 in turn, and then flows to the bus capacitor 20. If the bus capacitor 20 is not loaded with electricity at this time, the large current of the mains will rush to the bus capacitor 20 (charge the bus capacitor 20) instantly, causing an impact on the bus capacitor 20, which may damage the bus capacitor 20. In addition, in the case that the large current of the mains charges the first filter capacitor 32, a sharp current will be generated in the inverter input circuit 30, which may exceed the rated current value of the first switch 31, causing damage to the first switch 31. The sharp current will also cause current fluctuations in the inverter input circuit 30, which may cause the formation of an arc, further damaging the first switch 31.

[0043] Therefore, by providing the pre-charge circuit 40, the pre-charge circuit 40 includes a rectifier 41, which includes an alternating current input end and a direct current output end, the alternating current input end is connected to the charging interface 10, and the direct current output end is connected to the bus capacitor 20. In the case that the charging interface 10 is connected to the mains, the alternating current flows through the charging interface 10 to the alternating current input end of the rectifier 41, and is rectified by the rectifier 41 to direct current, and then flows from the direct current output end to the bus capacitor 20 to charge the bus capacitor 20, reducing the large current impact on the bus capacitor 20 when the first switch 31 is closed. The current can also flow through the bus capacitor 20 to the first filter capacitor 32 to charge the first filter capacitor 32, thereby raising the voltage of the first filter capacitor 32 (e.g., raising the voltage of the first filter capacitor 32 to 1 / 5, 1 / 6, etc. of the charging voltage of the first filter capacitor 32).

[0044] It can be understood that when a capacitor is charging, the size of the charging current that charges the capacitor is directly proportional to the voltage change rate of the capacitor (the change rate (dv / dt) between the charging start voltage and the charging completion voltage of the capacitor when charging). Therefore, after raising the voltage of the first filter capacitor 32, closing the first switch 31 again, the voltage change rate on the first filter capacitor 32 can be reduced, the current impact caused by the mains charging the first filter capacitor 32 through the inverter input circuit 30 can be reduced, the sharp current (surge sharp current) generated by the first filter capacitor 32 can be prevented from damaging the first switch 31, the current impact stress on the first switch 31 can be reduced, the formation of an arc can be avoided, and the service life of the first switch 31 can be improved.

[0045] Thus, the charge-discharge control circuit 100 of the energy storage device 1000 comprises a charging interface 10, a bus capacitor 20, an inverter input circuit 30, and a pre-charge circuit 40. The inverter input circuit 30 comprises a first switch component 31 and a first filter capacitor 32. The first switch component 31 is used to turn on or turn off the connection between the charging interface 10 and the bus capacitor 20. The first filter capacitor 32 is connected to the first switch component 31, and the first switch component 31 is located between the charging interface 10 and the first filter capacitor 32. The pre-charge circuit 40 comprises a rectifier 41, which comprises an alternating current input end and a direct current output end. The alternating current input end is connected to the charging interface 10, and the direct current output end is connected to the bus capacitor 20. By charging the bus capacitor 20 and the first filter capacitor 32 through the pre-charge circuit 40 before the first switch component 31 is closed, the large current impact on the bus capacitor 20 can be reduced. By charging the first filter capacitor 32 through the pre-charge circuit 40, that is, by raising the voltage of the first filter capacitor 32 through the pre-charge circuit 40 and then closing the first switch component 31, the voltage change rate on the first filter capacitor 32 can be reduced, the current impact caused by the charging of the first filter capacitor 32 by the mains through the inverter input circuit 30 can be alleviated, the peak current (surge peak current) generated by the first filter capacitor 32 can be prevented from damaging the first switch component 31, the current impact stress on the first switch component 31 can be reduced, the formation of an arc can be avoided, and the service life of the first switch component 31 can be improved.

[0046] In some embodiments, the charge-discharge control circuit 100 of the energy storage device 1000 further comprises:

[0047] a power factor correction circuit 50, which is used for bidirectional rectification between alternating current and direct current. The power factor correction circuit 50 is located between the direct current output end and the first switch component 31. The power factor correction circuit 50 comprises a second switch component, which is used to turn on or turn off the connection between the direct current output end and the first switch component 31. The second switch component is turned off when the charging interface 10 is connected to an external power source.

[0048] The power factor correction circuit 50 (PFC circuit 50) can improve the utilization rate of electrical energy of the energy storage device 1000. The PFC circuit 50 can also rectify alternating current into direct current and rectify direct current into alternating current.

[0049] The second switch component comprises one or more diodes. The diodes can be at least one of a rectifier diode and a metal oxide semiconductor field effect transistor (MOS tube). Please refer to Figure 2 The second switch component can comprise a diode Q2 and a diode Q3.

[0050] Optionally, the charge-discharge control circuit 100 of the energy storage device 1000 further comprises:

[0051] The second filter capacitor 60 is located between the first filter capacitor 32 and the power factor correction circuit 50.

[0052] Specifically, the PFC circuit 50 can rectify the current output by the DC output end into alternating current. When the second switch of the PFC circuit 50 is closed, the DC output end and the first switch 31 are conductive. The current output by the DC output end can flow to the first filter capacitor 32 after passing through the bus capacitor 20 and the PFC circuit 50, so as to charge the first filter capacitor 32. That is, referring to Figure 1 Before the first relay 311 and the second relay 312 are closed, the second switch (diode Q2 and diode Q3) can be closed first, so that the voltage charged by the pre-charge circuit 40 to the bus capacitor 20 reaches the second filter capacitor 60 (flows through diode Q2, PFC inductor and C1 capacitor in sequence) after passing through diode Q2, so as to charge the second filter capacitor 60; and then flows through the second filter capacitor 60 and inductor L2 in sequence to the first filter capacitor 32, so as to charge the first filter capacitor 32, thereby raising the voltage of the first filter capacitor 32 and the second filter capacitor 60 in advance before the first switch 31 is closed. Then, at the moment when the first switch 31 is closed, the impact of the mains on the first filter capacitor 32 and the second filter capacitor 60 can be reduced, the sharp inrush current can be avoided, the relay can be protected, and the service life of the relay can be prolonged.

[0053] Referring to Figure 2 , Figure 2 The current flow direction (arrow is the current flow direction) is exemplarily shown when the diode Q2 and the diode Q3 are closed. After the current flows from the bus capacitor 20 to the PFC circuit 50, since the PFC circuit 50 is grounded, part of the current flows to the ground, and the other part flows to the first filter capacitor 32 and the second filter capacitor 60 after passing through the diode Q2 and the diode Q3. Therefore, the first filter capacitor 32 and the second filter capacitor 60 can be charged by closing the diode Q2 and the diode Q3 (for example, for a duration of several alternating current cycles).

[0054] It can be understood that, since the capacitor C1 and the bus capacitor 20 are in parallel (work at the same voltage), the first switch 31 can be closed again at the positive half cycle of the mains (i.e., the L voltage signal is positive and the N voltage signal is negative) by detecting the alternating current cycle of the mains, so that the current flows smoothly to the bus capacitor 20 (and the capacitor C1), and the impact of the sharp inrush current on the relay is further avoided.

[0055] Referring again to Figure 2When the first switch 31 is closed, the current flows through the first filter capacitor 32, the inductor L2 and the second filter capacitor 60 in sequence, i.e. the first filter capacitor 32 is arranged before the inductor L2 to filter and provide a stable current input, and the second filter capacitor 60 is arranged after the inductor L2 to adjust the current harmonic interference generated by the inductor L2, thereby improving the stability of the circuit.

[0056] In some embodiments, the pre-charge circuit 40 further comprises a current limiting device 42 arranged between the charging interface 10 and the bus capacitor 20, and the current limiting device 42 is configured to limit the current of the pre-charge circuit 40 to a preset current.

[0057] In some embodiments, the current limiting device 42 comprises at least one of a resistor and an inductor (e.g. a patch inductor).

[0058] In some embodiments, the preset current is a maximum charging current value set in the pre-charge circuit 40 for protecting the bus capacitor 20.

[0059] Optionally, the current limiting device 42 comprises a first current limiting device and a second current limiting device, the first end of the bus capacitor 20 is connected to the positive pole of the DC output end, the first current limiting device is arranged between the first end of the bus capacitor 20 and the positive pole of the DC output end, the second end of the bus capacitor 20 is connected to the negative pole of the DC output end, and the second current limiting device is arranged between the second end of the bus capacitor 20 and the negative pole of the DC output end.

[0060] In some embodiments, the pre-charge circuit 40 further comprises a current limiting device 42 arranged between the bus capacitor 20 and the rectifier 41, and the current limiting device 42 is configured to reduce the size of the DC current output by the DC output end of the rectifier 41, limit the size of the DC current to a preset current, and further protect the bus capacitor 20.

[0061] The current limiting device 42 comprises a first current limiting device (e.g. refer to Figure 2 , the first current limiting device comprises a resistor R1 with a resistance of 100 ohms (Ω)) and a second current limiting device (e.g. refer to Figure 2 , the second current limiting device comprises a resistor R2 with a resistance of 100 ohms (Ω)), the first end of the bus capacitor 20 is connected to the positive pole of the DC input end of the rectifier 41, the first current limiting device is arranged between the first end of the bus capacitor 20 and the positive pole of the DC output end, the second end is connected to the negative pole of the DC output end of the rectifier 41, and the second current limiting device is arranged between the second end of the bus capacitor 20 and the negative pole of the DC output end, so as to limit the current flowing to the bus capacitor 20 and further improve the stability of the pre-charge circuit 40, thereby improving the stability of the charging and discharging circuit.

[0062] Optionally, the charging and discharging control circuit 100 of the energy storage device 1000 further comprises:

[0063] The inverter output circuit 70 is connected to the inverter input circuit 30, and the first switch 31 is used to turn on the connection between the inverter output circuit 70 and the inverter input circuit 30.

[0064] The power supply interface 80, the inverter output circuit 70 includes a third switch 71, and the third switch 71 is used to turn on or turn off the connection between the inverter output circuit 70 and the power supply interface 80.

[0065] The energy storage device 1000 can output electric energy to an external load through the inverter output circuit 70.

[0066] The power supply interface 80 can be used to connect a load to supply power to the load. For example, please refer to Figure 2 The power supply interface 80 includes a first power supply interface 81 and a second power supply interface 82, the first power supply interface 81 is used to connect the L line of the load, and the second power supply interface 82 is used to connect the N line of the load to supply power to the load.

[0067] Specifically, the charge and discharge control circuit 100 of the energy storage device 1000 further includes an inverter output circuit 70 and a power supply interface 80, the inverter output circuit 70 includes a third switch 71, and when the third switch 71 is closed, the connection between the inverter output circuit 70 and the power supply interface 80 can be turned on, and the energy storage device 1000 can supply power to the load through the inverter output circuit 70 and the power supply interface 80.

[0068] It should be pointed out that after the bus capacitor 20 and the PFC circuit 50 work stably without failure, the pre-charging circuit 40 can be turned off, and the AC mains does not need to flow through the pre-charging circuit 40 again, which can reduce the power loss of the energy storage device 1000 and improve the power of the energy storage device 1000.

[0069] Please refer to Figure 1 The energy storage device 1000 of the embodiment of the present application includes the charge and discharge control circuit 100 of the energy storage device 1000 of any of the above-mentioned embodiments.

[0070] In the description of the specification, the description using the terms "one embodiment", "some embodiments", "certain embodiments", "an example", "a specific example" or "some examples" etc. means that the particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. The illustrative appearances of the above terms in various places in the specification are not necessarily referred to the same embodiment or example. Also, the particular features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, in non-contradictory relation to each other, those skilled in the art can combine and combine the features described in the different embodiments or examples and the features of the different embodiments or examples in the specification.

[0071] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A charge and discharge control circuit for an energy storage device, characterized in that: The charge and discharge control circuit includes: Charging port; busbar capacitance; an inverter input circuit, the inverter input circuit comprising a first switch element and a first filter capacitor, the first switch element being used to connect or disconnect the charging interface and the bus capacitor, the first filter capacitor being connected to the first switch element, and the first switch element being located between the charging interface and the first filter capacitor; A pre-charging circuit includes a rectifier, 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.

2. The charge and discharge control circuit of the energy storage device according to claim 1, 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.

3. The charge and discharge control circuit of the energy storage device according to claim 2, characterized in that: The current limiting device includes at least one of a resistor and an inductor.

4. The charge and discharge control circuit of the energy storage device according to claim 2, characterized in that: The current limiting device includes a first current limiting device and a second current limiting device. The first end of the bus capacitor is connected to the positive electrode of the DC output end, and the first current limiting device is located between the first end of the bus capacitor and the positive electrode of the DC output end. The second end of the bus capacitor is connected to the negative electrode of the DC output end, and the second current limiting device is located between the second end of the bus capacitor and the negative electrode of the DC output end.

5. The charge and discharge control circuit of the energy storage device according to claim 1, characterized in that: The first switch element includes a relay, and the relay includes a first relay and a second relay. The first relay is located at the live line of the charge and discharge control circuit, and the second relay is located at the neutral line of the charge and discharge control circuit.

6. The charge and discharge control circuit of the energy storage device according to claim 1, characterized in that: The charge and discharge control circuit further includes: A power factor correction circuit, the power factor correction circuit is used for bidirectional rectification between AC and DC; the power factor correction circuit is located between the DC output terminal and the first switch element, the power factor correction circuit includes a second switch element, the second switch element is used to conduct or disconnect the connection between the DC output terminal and the first switch element, and the second switch element is disconnected when the charging interface is connected to an external power supply.

7. The charge and discharge control circuit of the energy storage device according to claim 6, characterized in that: The second switching element includes a diode.

8. The charge and discharge control circuit of the energy storage device according to claim 6, characterized in that: Also includes: A second filter capacitor is located between the first filter capacitor and the power factor correction circuit.

9. The charge and discharge control circuit of the energy storage device according to claim 1, characterized in that: Also includes: an inverter output circuit, the inverter output circuit being connected to the inverter input circuit, the first switch element being further configured to conduct the connection between the inverter output circuit and the inverter input circuit; The power supply interface includes a third switch component, and the third switch component is used to turn on or off the connection between the inverter output circuit and the power supply interface.

10. An energy storage device, characterized in that: include: The charge and discharge control circuit according to any one of claims 1 to 9.

Images