CN221126915U - DC power supply circuit, high-voltage box and energy storage system of battery management system - Google Patents
DC power supply circuit, high-voltage box and energy storage system of battery management system Download PDFInfo
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- CN221126915U CN221126915U CN202322766327.7U CN202322766327U CN221126915U CN 221126915 U CN221126915 U CN 221126915U CN 202322766327 U CN202322766327 U CN 202322766327U CN 221126915 U CN221126915 U CN 221126915U
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Abstract
The application relates to a direct current power supply circuit, a high-voltage box and an energy storage system of a battery management system, and relates to the technical field of energy storage equipment. The direct current power supply circuit includes: a first power supply circuit and a second power supply circuit configured to output direct current to the battery management system; the output end of the first power supply circuit and the output end of the second power supply circuit are respectively connected with the battery management system; the input end of the first power supply circuit is configured to input alternating current; the input end of the second power supply circuit is configured to input direct current output by the direct current power supply. The battery management system in the embodiment of the application can supply power by adopting alternating current and direct current output by the direct current power supply, so that when the alternating current is disconnected, the power supply can be switched to supply power by adopting the direct current output by the direct current power supply. When the residual electric quantity of the direct-current power supply is low, the alternating-current power supply can be switched to be adopted, so that the continuous and stable power supply of the battery management system is ensured, and the stable operation of the energy storage system is ensured.
Description
Technical Field
The application relates to the technical field of energy storage equipment, in particular to a direct current power supply circuit, a high-voltage box and an energy storage system of a battery management system.
Background
Among the energy storage systems are generally a Battery MANAGEMENT SYSTEM (BMS), a high voltage tank and an energy storage Battery pack, wherein the high voltage tank is mainly used for isolating the energy storage Battery pack from a load, providing low voltage direct current required for the BMS, and controlling charge and discharge of the energy storage Battery pack.
The general high-voltage box mainly comprises components such as a high-voltage isolating switch, a low-voltage control switch, a fuse, an alternating current-to-direct current transformer (AC/DC transformer), a direct current-to-direct current transformer (DC/DC transformer), a BMS control board, a relay, a wiring terminal, a connector, a wire harness and the like. When the BMS is powered, the following two modes are adopted: the first mode is to access alternating current commercial power through a delta connector, and the alternating current commercial power is converted into low-voltage direct current through an AC/DC transformer and then is supplied to the BMS; the other way is to take high-voltage direct current directly from the positive and negative poles of the direct current side of the energy storage battery pack, and supply the low-voltage direct current to the BMS after the high-voltage direct current is reduced by the DC/DC transformer.
The following defects exist in the two modes: aiming at the first mode, if the alternating current commercial power is abnormal, the power cannot be normally supplied to the BMS, so that the energy storage system stops working. For the second mode, the energy storage battery pack can continuously supply power to the BMS, and the situation that the energy storage battery pack is overdischarged easily causes damage to the energy storage battery pack.
Disclosure of utility model
In view of the above, embodiments of the present application provide a dc power supply circuit, a high voltage tank and an energy storage system of a battery management system to solve at least one of the problems in the background art.
In a first aspect, an embodiment of the present application provides a dc power supply circuit of a battery management system, where the dc power supply circuit includes: a first power supply circuit and a second power supply circuit configured to output direct current to the battery management system;
The output end of the first power supply circuit and the output end of the second power supply circuit are respectively connected with the battery management system;
the input end of the first power supply circuit is configured to input alternating current;
The input end of the second power supply circuit is configured to input direct current output by the direct current power supply.
With reference to the first aspect, in an alternative embodiment, the first power supply circuit includes a first reverse isolation device, and an output terminal is connected to the battery management system and configured to be capable of and only capable of transmitting current from an input terminal to an output terminal of the first reverse isolation device.
With reference to the first aspect, in an optional implementation manner, the first power supply circuit further includes:
a first ac-to-dc device configured to convert an input ac power into a dc power and output the dc power;
And one end of the first switching device is connected with the output end of the first alternating current-to-direct current device, the other end of the first switching device is connected with the input end of the first reverse isolation device, and the first switching device is configured to conduct or break the electrical connection between the first alternating current-to-direct current device and the first reverse isolation device.
With reference to the first aspect, in an optional implementation manner, the dc power supply circuit further includes an energy storage battery pack power supply circuit and/or a utility power grid power supply circuit connected to the first power supply circuit input terminal, and the energy storage battery pack power supply circuit and/or the utility power grid power supply circuit are configured to output an alternating current to the first power supply circuit.
With reference to the first aspect, in an optional implementation manner, the direct current power supply circuit further includes an energy storage battery pack power supply circuit and a utility power grid power supply circuit connected with the input end of the first power supply circuit;
The energy storage battery pack power supply circuit comprises a third reverse isolation device, the output end of the third reverse isolation device is electrically connected with the input end of the first power supply circuit and is configured to be capable of transmitting current from the input end of the third reverse isolation device to the output end only;
the utility grid power supply circuit comprises a second reverse isolation device, the output end of which is electrically connected with the input end of the first power supply circuit and is configured to be capable of transmitting current from the input end of the second reverse isolation device to the output end only.
With reference to the first aspect, in an optional implementation manner, the second power supply circuit includes:
And a second switching device having one end configured to input the direct current outputted from the direct current power source and the other end connected to the battery management system, and configured to turn on or off a path for transmitting the direct current inputted from one end of the second switching device to the battery management system.
In a second aspect, an embodiment of the present application provides a high-voltage tank, where the high-voltage tank includes the dc power supply circuit, the battery management system, and the dc power supply of the battery management system described above;
And the alternating current or the direct current output by the direct current power supply is processed by the direct current power supply circuit and then transmitted to the battery management system so as to supply power to the battery management system.
With reference to the second aspect, in an optional implementation manner, the high-voltage box further includes a voltage detection device, which is connected to the dc power supply and the battery management system, and configured to obtain a current voltage value of the dc power supply and output the current voltage value to the battery management system;
The battery management system is configured to control the on or off of a second power supply circuit according to the current voltage value so that the second power supply circuit starts or stops outputting direct current to the battery management system.
With reference to the second aspect, in an alternative embodiment, the battery management system is further configured to generate and output an alarm signal in case the current voltage value is less than or equal to a low voltage threshold, and control a second power supply circuit to stop supplying power to the battery management system, and disconnect the second power supply circuit from the battery management system.
In a third aspect, an embodiment of the present application provides an energy storage system including the high-voltage tank described above.
The technical scheme provided by the embodiment of the application has the beneficial effects that: the first power supply circuit and the second power supply circuit are used for supplying direct current to the battery management system, so that the battery management system can supply power by using alternating current and direct current output by a direct current power supply, and when the alternating current is broken, the battery management system can be switched to supply power by using the direct current output by the direct current power supply. When the residual electric quantity of the direct current power supply is lower, the direct current power supply can be switched to supply power by adopting alternating current, the overdischarge of the direct current power supply can not be caused, the service lives of the direct current power supply and an energy storage system are prolonged, the continuous and stable power supply of the battery management system is ensured, and the stable operation of the energy storage system is ensured.
In the technical scheme provided by the embodiment of the application, the electric energy of the battery management system is preferably supplied by a commercial power grid, when the commercial power grid fails, the battery management system is supplied by a direct current power supply, and when the commercial power grid fails or the direct current power supply is deficient, the battery management system is supplied by an energy storage battery pack; the problem of battery management system outage or energy storage battery damage caused by mains power grid outage or energy storage battery pack overdischarge is effectively solved.
Additional aspects and advantages of embodiments of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments. In the drawings:
FIG. 1 is a schematic block diagram of a specific example of a DC power supply circuit of a battery management system in an embodiment of the application;
FIG. 2 is a circuit diagram of a specific example of a DC power supply circuit of a battery management system in an embodiment of the present application;
Fig. 3 is a circuit diagram showing a specific example of the high-voltage tank in the embodiment of the present application.
Detailed Description
In order to make the technical scheme and beneficial effects of the embodiments of the present application more obvious and understandable, the following detailed description is given by way of example only. Wherein the drawings are not necessarily to scale, and wherein local features may be exaggerated or reduced to more clearly show details of the local features; unless otherwise defined, technical and scientific terms used herein have the same meaning as those in the technical field to which the embodiments of the present application belong.
It should be noted that the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. When "first" is described, it does not necessarily mean that "second" is present; and when "second" is discussed, it is not intended that the application necessarily exists "first". The singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "comprising" is used to determine the presence of an included feature, but does not exclude the presence or addition of one or more other features. The term "and/or" includes any and all combinations of the associated listed items.
An embodiment of the present application provides a direct current power supply circuit of a Battery Management System (BMS), which can be applied to an energy storage system, as shown in fig. 1, and includes: a first power supply circuit 10 and a second power supply circuit 20 configured to output direct current to the battery management system;
The output end of the first power supply circuit 10 and the output end of the second power supply circuit 20 are respectively connected with the battery management system 100;
the input terminal of the first power supply circuit 10 is configured to input alternating current;
The input terminal of the second power supply circuit 20 is configured to input the direct current output from the direct current power supply 200.
In the embodiment of the application, the first power supply circuit and the second power supply circuit are used for supplying direct current to the battery management system, so that the battery management system can supply power by adopting alternating current and direct current output by a direct current power supply, and when the alternating current is disconnected, the direct current output by the direct current power supply can be switched to supply power. When the residual electric quantity of the direct current power supply is lower, the direct current power supply can be switched to supply power by adopting alternating current, the overdischarge of the direct current power supply can not be caused, the service lives of the direct current power supply and an energy storage system are prolonged, the continuous and stable power supply of the battery management system is ensured, and the stable operation of the energy storage system is ensured.
In an alternative embodiment, as shown in fig. 1 and 2, the first power supply circuit 10 includes a first reverse isolation device 13, the output of which is connected to the battery management system 100 and is configured to be capable of and capable of transmitting current only from the input to the output of the first reverse isolation device 13.
In an alternative embodiment, the first power supply circuit 10 further includes:
A first ac-dc conversion device 11 configured to convert an input ac power into a dc power and output the dc power;
And a first switching device 12, one end of which is connected to the output end of the first ac-dc conversion device 11, and the other end of which is connected to the input end of the first reverse isolation device 13, and configured to turn on or off the electrical connection between the first ac-dc conversion device 11 and the first reverse isolation device 13.
As a specific example, the first AC to DC conversion device 11 may be an AC/DC transformer or other device capable of converting AC to DC. As shown in fig. 2, the first AC-DC converting device 11 is an AC/DC transformer. The direct current required for the BMS is low voltage direct current, and the AC/DC transformer may convert alternating current supplied from an alternating current power source (e.g., AC mains) into low voltage direct current required for the BMS to supply the BMS. The first switch device 12 may include one switch or more than two switches, and the switch may be a manual switch or an electric control switch. As shown in fig. 2, the first switching device 12 is a first switch, which is an electronically controlled switch, and can be controlled to be turned on and off by the BMS. The first reverse isolation device 13 may be a diode, a device composed of at least two diodes, or other devices capable of achieving unidirectional conduction. As shown in fig. 2, the first reverse isolation device 13 is a first diode. The diode can play a role in preventing current backflow, for example, the diode can prevent direct current of the direct current power supply from being transmitted to the direction of the alternating current power supply. The input end of the AC/DC transformer is connected with alternating current commercial power, the output end of the AC/DC transformer is connected with one end of a first switch, the other end of the first switch is connected with the positive electrode of a first diode, and the negative electrode of the first diode is connected with the BMS.
In an alternative embodiment, as shown in fig. 1 and 3, the dc power supply circuit further comprises an energy storage battery pack power supply circuit and/or a utility power grid power supply circuit connected to the input of the first power supply circuit 10, the energy storage battery pack power supply circuit and/or the utility power grid power supply circuit being configured to output an alternating current to the first power supply circuit 10.
In an alternative embodiment, the direct current power supply circuit further comprises an energy storage battery pack power supply circuit and a mains power grid power supply circuit which are connected with the input end of the first power supply circuit 10;
The energy storage battery pack power supply circuit comprises a third inverting isolation device 34, the output of which is electrically connected to the input of the first power supply circuit 10 and is configured to be able to and only able to transmit current from the input to the output of the third inverting isolation device 34;
The mains power supply circuit comprises a second reverse isolation device 14, the output of which is electrically connected to the input of the first power supply circuit 10, configured to be able to and only able to transmit current from the input to the output of the second reverse isolation device 14.
In an embodiment of the present application, as shown in fig. 3, the input terminal of the power supply circuit of the energy storage battery pack may be configured to input the direct current output by the energy storage battery pack 400. The direct current output by the energy storage battery pack is processed through the energy storage battery pack power supply circuit and then is supplied to the battery management system, so that the power supply sources of the low-voltage direct current of the battery management system comprise alternating current mains supply, direct current output by a direct current power supply and direct current output by the energy storage battery pack, when the alternating current mains supply is disconnected, the direct current output by the direct current power supply can be switched to be used for supplying power, when the residual electric quantity of the direct current power supply is lower, the direct current output by the energy storage battery pack can be switched to be used for supplying power until the energy storage battery pack triggers discharge protection to stop discharging outwards, the over-discharge of the direct current power supply and the over-discharge of the energy storage battery pack are avoided, the service lives of the direct current power supply, the energy storage battery pack and the energy storage system are prolonged, the continuous and stable power supply of the battery management system is ensured, and the stable operation of the energy storage system is ensured.
In an alternative embodiment, as shown in fig. 3, the energy storage battery pack power supply circuit includes:
A discharge switching device 31 having one end configured to input the direct current outputted from the energy storage battery pack 400 and the other end connected to the input end of the direct current-to-alternating current device 32, and configured to turn on or off a path for transmitting the direct current inputted from one end of the discharge switching device 31 to the input end of the direct current-to-alternating current device 32;
A dc-to-ac device 32 having an output connected to one end of the fourth switching device 33 and configured to convert the input dc power into ac power and output the ac power;
The fourth switching device 33, the other end of which is connected to the input of the third inverting isolation device 34, is configured to turn on or off the electrical connection between the dc-to-ac device 32 and the third inverting isolation device 34.
In the embodiment of the present application, the dc power output by the energy storage battery pack 400 is high voltage dc power, and is converted into ac power by the third power supply circuit 30, and then is converted into low voltage dc power by the first ac-dc conversion device 11, the first switching device 12 and the first reverse isolation device 13 in sequence, and is provided to the BMS.
As a specific example, the discharge switching device 31 may include one switch, or may include two or more switches, and the switch may be a manual switch or an electric control switch. As shown in fig. 3, the discharge switching device 31 is a discharge relay switch, and can be controlled to be turned on and off by the BMS. The DC to AC device 32 may be a DC/AC transformer component in the energy storage converter PCS, or may be a separate DC/AC transformer or other device capable of DC to AC. As shown in fig. 3, the DC-to-AC converter 32 is a DC/AC transformer component in the energy storage converter PCS. The fourth switching device 33 may include one switch or more than two switches, and the switch may be a manual switch or an electric control switch. As shown in fig. 3, the fourth switching device 33 is a fourth switch, and can be controlled to be turned on and off by the BMS. One end of the discharging relay switch is connected with the energy storage battery pack 400, the other end of the discharging relay switch is connected with the input end of the DC/AC transformer, the output end of the DC/AC transformer outputs alternating current, the discharging relay switch is connected with one end of the fourth switch, the other end of the fourth switch is connected with the positive electrode of the third diode, and the negative electrode of the third diode is connected with the second input end of the AC/DC transformer.
When the alternating current commercial power is powered on, the third switch and the first switch are closed, the fourth switch and the second switch are opened, and the alternating current commercial power provides low-voltage direct current required by the BMS. When the alternating current mains supply fails, the second switch is closed, the third switch and the first switch are opened, the lead-acid battery provides low-voltage direct current required by the BMS, a voltmeter is used for detecting the voltage condition of the lead-acid battery in real time, the detected voltage condition is transmitted to the BMS, the BMS generates and outputs an alarm signal when the current voltage value of the lead-acid battery is smaller than or equal to a low-voltage threshold value, and the second switch is opened; at this time, the fourth switch and the first switch are closed, the energy storage battery pack provides low-voltage direct current required by the BMS until the energy storage battery pack triggers discharge protection, the discharge relay switch is opened, the energy storage battery pack stops discharging outwards, and overdischarge of the energy storage battery pack is avoided.
In the embodiment of the application, when the alternating current mains supply is normal, the power consumption of the BMS is supplied after the alternating current mains supply is converted into low-voltage direct current by the AC/DC transformer. When the alternating current commercial power is in power failure or broken, the alternating current commercial power is supplied by a lead-acid battery. When the lead-acid battery is deficient and the energy storage battery pack has residual electric quantity, the high-voltage direct current output by the energy storage battery pack is converted into alternating current through the DC/AC transformer, and then is converted into low-voltage direct current through the AC/DC transformer and then is supplied. Because the energy storage battery pack is not directly supplied to the BMS, when the energy storage battery pack discharges and reaches the threshold value, the BMS can trigger discharge protection, and the discharge relay switch is disconnected, so that overdischarge of the energy storage battery pack is not caused, and the energy storage battery pack does not work any more at the moment, and the BMS can not be powered, so that the energy storage battery pack can continuously and stably provide low-voltage direct current for the BMS during normal work, and continuous and stable power supply of the BMS is ensured, and stable operation of the energy storage system is ensured.
In an alternative embodiment, the utility grid power supply circuit further comprises: and a third switching device 15 having one end configured to input ac mains and the other end connected to the input end of the second reverse isolating device 14, and configured to turn on or off a path transmitting the ac mains input from one end of the third switching device 15 to the input end of the second reverse isolating device 14.
As a specific example, the third switch device 15 may include one switch, or may include more than two switches, and the switch may be a manual switch or an electrically controlled switch. As shown in fig. 3, the third switching device 15 is a third switch, which is an electronically controlled switch, and can be controlled to be turned on and off by the BMS. The second reverse isolation device 14 may be a diode, a device of at least two diodes, or other device capable of unidirectional conduction. As shown in fig. 3, the second reverse isolation device 14 is a second diode, and can function to prevent the reverse current flow. The third reverse isolation device 34 may be a diode, a device of at least two diodes, or other device capable of achieving unidirectional conduction. As shown in fig. 3, the third reverse isolation device 34 is a third diode, and prevents the reverse current flow.
In an alternative embodiment, as shown in fig. 1 and 2, the second power supply circuit 20 includes:
The second switching device 21 has one end configured to input the direct current outputted from the direct current power source 200 and the other end connected to the battery management system 100, and is configured to turn on or off a path for transmitting the direct current inputted from one end of the second switching device 21 to the battery management system 100.
As a specific example, the second switching device 21 may include one switch, or may include more than two switches, and the switch may be a manual switch or an electrically controlled switch. As shown in fig. 2, the second switching device 21 is a second switch, which is an electronically controlled switch, and can be controlled to be turned on and off by the BMS. One end of the second switch is connected with the direct current power supply 200, and the other end is connected with the BMS.
The embodiment of the application also provides a high-voltage box, as shown in fig. 3, which comprises the direct-current power supply circuit of the battery management system, the battery management system 100 and the direct-current power supply 200;
The direct current output by the alternating current commercial power or the direct current power supply 200 is processed by the direct current power supply circuit and then transmitted to the battery management system 100 so as to supply direct current power to the battery management system.
As a specific example, the ac mains may be 220V or 380V ac. The dc power supply 200 may be a low voltage dc power supply, which may be a 12V, 16V or 24V low voltage dc power supply. The low voltage dc power source may be a battery. The storage battery can be a lead-acid battery, the service life of the lead-acid battery is not shortened or damaged due to over-discharge, and the voltage of the lead-acid battery is consistent with the voltage required by the BMS.
In an alternative embodiment, the high-voltage box further comprises a voltage detection device 300 connected to the dc power supply 200 and the battery management system 100, respectively, and configured to obtain the current voltage value of the dc power supply 200 and output the current voltage value to the battery management system 100;
the battery management system 100 is configured to control on or off of the second power supply circuit according to the present voltage value, so that the second power supply circuit turns on or stops outputting direct current to the battery management system.
In an alternative embodiment, the battery management system 100 is further configured to generate and output an alarm signal in the case that the current voltage value is less than or equal to the low voltage threshold value, and control the second power supply circuit to stop supplying power to the battery management system, and disconnect the second power supply circuit from the battery management system.
As a specific example, the voltage detection device 300 may be a voltmeter or other device capable of detecting the remaining power of the dc power supply. As shown in fig. 3, the voltage detection device 300 is a voltmeter. The voltage detection device is used for detecting the real-time voltage of the direct-current power supply, transmitting the detected voltage information to the BMS, monitoring the residual electric quantity of the direct-current power supply according to the received voltage information, generating and outputting an alarm signal (three-level alarm) under the condition that the current voltage value is smaller than or equal to a low-voltage threshold value, and controlling the second switch to be disconnected according to the alarm signal to stop the power supply from supplying power to the BMS.
In an alternative embodiment, the first switching device 12, the second switching device 21 and the third switching device 15 are configured to be turned on or off under the control of the battery management system 100;
the battery management system 100 is further configured to control the first switching device 12, the second switching device 21, and the third switching device 15 to be all turned on to supply power to the battery management system 100 through ac mains and charge the dc power.
As a specific example, when the ac mains supply is restored to normal, the first, second and third switches are closed, and the ac mains supply supplies power to the BMS and charges the lead-acid battery.
In an alternative embodiment, the high voltage box further includes an energy storage battery 400, and the dc power output by the energy storage battery 400 is processed by the dc power supply circuit and then transmitted to the battery management system 100, so as to provide the dc power to the battery management system 100.
In an alternative embodiment, the high voltage tank further comprises a charging switch device 500 and a second ac to dc device 600;
An output terminal of the second ac-dc conversion device 600 is connected to one terminal of the charging switch device 500, and is configured to convert the input ac into dc and output the dc;
The other end of the charging switch device 500 is connected to the energy storage battery 400 and is configured to make or break an electrical connection between the second ac-dc conversion device 600 and the energy storage battery 400.
As a specific example, the second AC to DC conversion device 600 may be an AC/DC transformer component in the energy storage converter PCS, or may be a separate AC/DC transformer or other device capable of converting AC to DC. As shown in fig. 3, the second AC to DC device 600 is an AC/DC transformer component in the energy storage converter PCS. The charging switch device 500 may include one switch or more than two switches, and the switch may be a manual switch or an electric control switch. As shown in fig. 3, the charging switching device 500 is a charging relay switch, and can be controlled to be turned on and off by the BMS. The energy storage battery pack converts high-voltage direct current into 220V or 380V alternating current through a DC/AC transformer component of the energy storage converter PCS, one part of the alternating current can be supplied to an external load for use, and the other part of the alternating current can be converted into low-voltage direct current through an AC/DC transformer for supplying to the BMS. Part of alternating current or part of alternating current mains supply provided by the energy storage battery pack can be supplied to an external load for use, and the other part of alternating current mains supply can be converted into low-voltage direct current through an AC/DC transformer to be supplied to the BMS; the alternating-current commercial power can also charge the energy storage battery pack after passing through the AC/DC transformer component of the energy storage converter PCS.
The embodiment of the application also provides an energy storage system which comprises the high-voltage tank.
It should be understood that the above examples are illustrative and are not intended to encompass all possible implementations encompassed by the claims. Various modifications and changes may be made in the above embodiments without departing from the scope of the disclosure. Likewise, the individual features of the above embodiments can also be combined arbitrarily to form further embodiments of the application which may not be explicitly described. Therefore, the above examples merely represent several embodiments of the present application and do not limit the scope of protection of the patent of the present application.
Claims (10)
1. A dc power supply circuit for a battery management system, the dc power supply circuit comprising: a first power supply circuit and a second power supply circuit configured to output direct current to the battery management system;
The output end of the first power supply circuit and the output end of the second power supply circuit are respectively connected with the battery management system;
the input end of the first power supply circuit is configured to input alternating current;
The input end of the second power supply circuit is configured to input direct current output by the direct current power supply.
2. The direct current power supply circuit according to claim 1, wherein the first power supply circuit comprises a first reverse isolation device, an output connected to the battery management system, configured to be able to and only able to transfer current from an input to an output of the first reverse isolation device.
3. The direct current supply circuit of claim 2, wherein the first supply circuit further comprises:
a first ac-to-dc device configured to convert an input ac power into a dc power and output the dc power;
And one end of the first switching device is connected with the output end of the first alternating current-to-direct current device, the other end of the first switching device is connected with the input end of the first reverse isolation device, and the first switching device is configured to conduct or break the electrical connection between the first alternating current-to-direct current device and the first reverse isolation device.
4. The direct current supply circuit according to claim 2, characterized in that: the direct current power supply circuit further comprises an energy storage battery pack power supply circuit and/or a mains power grid power supply circuit connected with the input end of the first power supply circuit, and the energy storage battery pack power supply circuit and/or the mains power grid power supply circuit are/is configured to output alternating current to the first power supply circuit.
5. The direct current supply circuit according to claim 2, characterized in that: the direct current power supply circuit further comprises an energy storage battery pack power supply circuit and a mains supply power grid power supply circuit which are connected with the input end of the first power supply circuit;
The energy storage battery pack power supply circuit comprises a third reverse isolation device, the output end of the third reverse isolation device is electrically connected with the input end of the first power supply circuit and is configured to be capable of transmitting current from the input end of the third reverse isolation device to the output end only;
the utility grid power supply circuit comprises a second reverse isolation device, the output end of which is electrically connected with the input end of the first power supply circuit and is configured to be capable of transmitting current from the input end of the second reverse isolation device to the output end only.
6. The direct current power supply circuit according to claim 1, wherein the second power supply circuit includes:
And a second switching device having one end configured to input the direct current outputted from the direct current power source and the other end connected to the battery management system, and configured to turn on or off a path for transmitting the direct current inputted from one end of the second switching device to the battery management system.
7. A high-voltage tank, characterized in that the high-voltage tank comprises a direct-current power supply circuit of the battery management system according to any one of claims 1 to 6, a battery management system and a direct-current power supply;
And the alternating current or the direct current output by the direct current power supply is processed by the direct current power supply circuit and then transmitted to the battery management system so as to supply power to the battery management system.
8. The high voltage tank according to claim 7, further comprising a voltage detection device connected to the dc power supply and the battery management system, respectively, configured to obtain a current voltage value of the dc power supply and output the current voltage value to the battery management system;
The battery management system is configured to control the on or off of a second power supply circuit according to the current voltage value so that the second power supply circuit starts or stops outputting direct current to the battery management system.
9. The high voltage tank of claim 8, wherein the battery management system is further configured to generate and output an alarm signal and control a second power supply circuit to stop supplying power to the battery management system in the event that the present voltage value is less than or equal to a low voltage threshold, disconnecting the second power supply circuit from the battery management system.
10. An energy storage system comprising the high pressure tank of claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322766327.7U CN221126915U (en) | 2023-10-16 | 2023-10-16 | DC power supply circuit, high-voltage box and energy storage system of battery management system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322766327.7U CN221126915U (en) | 2023-10-16 | 2023-10-16 | DC power supply circuit, high-voltage box and energy storage system of battery management system |
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| CN221126915U true CN221126915U (en) | 2024-06-11 |
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