Power supply circuit and energy storage system

Abstract

The utility model discloses a power supply circuit and an energy storage system. The power supply circuit comprises a first power supply branch, at least one second power supply branch and a power supply redundancy module. One end of the first power supply branch is electrically connected with commercial power, one end of the second power supply branch is electrically connected with an energy storage object of the energy storage system, a first end of the power redundancy module is electrically connected with the other end of the first power supply branch, and a second end of the power redundancy module is electrically connected with the other end of the second power supply branch. The third end of the power supply redundancy module is electrically connected with the load of the energy storage system; when the mains supply is powered off, the first end and the third end of the power supply redundancy module are disconnected, the second end and the third end of the power supply redundancy module are connected, and the energy storage object is configured to supply power to the load; when the commercial power does not fail, the first end and the third end of the power supply redundancy module are conducted, the second end and the third end of the power supply redundancy module are disconnected, the commercial power is configured to supply power to the load, and the installation cost and the maintenance cost of the energy storage system are reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a power supply circuit and energy storage system. Background Technology

[0002] Centralized energy storage containers typically consist of battery clusters, fire protection systems, thermal management systems, air conditioning, combiner cabinets, water immersion temperature and humidity sensors, and lighting systems. Critical loads within these containers, such as fire protection systems and battery management systems, usually require dual power supplies. The first power source is a 380V AC power supply (mains power) outside the container, while the second power source serves as a backup, powered by an uninterruptible power supply (UPS). This allows the UPS to prevent power outages to critical loads within the container in the event of a 380V AC power failure. However, UPS systems are expensive, typically use lead-acid batteries with short lifespans, and are large, making installation within centralized energy storage containers difficult and consequently increasing installation and maintenance costs. Utility Model Content

[0003] In view of the shortcomings of the prior art, this application provides a power supply circuit and energy storage system, which aims to solve the technical problem of high installation and maintenance costs of centralized energy storage containers.

[0004] To address the aforementioned problems, in a first aspect, this application provides a power supply circuit comprising:

[0005] The first power supply branch has one end connected to the mains power supply.

[0006] At least one second power supply branch, one end of which is electrically connected to the energy storage object of the energy storage system;

[0007] The power redundancy module has its first terminal electrically connected to the other end of the first power supply branch, its second terminal electrically connected to the other end of the second power supply branch, and its third terminal electrically connected to the load of the energy storage system.

[0008] When the mains power fails, the first and third terminals of the power redundancy module are disconnected, while the second and third terminals of the power redundancy module are connected, and the energy storage object is configured to supply power to the load. When the mains power is not lost, the first and third terminals of the power redundancy module are connected, while the second and third terminals of the power redundancy module are disconnected, and the mains power is configured to supply power to the load.

[0009] Furthermore, in the power supply circuit provided in this application, when the mains power is not interrupted, the voltage difference between the voltage output by the first power supply branch and the voltage output by the second power supply branch is greater than or equal to a preset voltage.

[0010] Furthermore, in the power supply circuit provided in this application, the first power supply branch includes a first switching power supply;

[0011] Wherein, one end of the first switching power supply is electrically connected to the mains power, and the other end of the first switching power supply is electrically connected to the first end of the power redundancy module; the first switching power supply is configured to convert the AC power output from the mains power into a power supply for the load; or / and,

[0012] The second power supply branch includes a second switching power supply;

[0013] One end of the second switching power supply is electrically connected to the energy storage object, and the other end of the second switching power supply is electrically connected to the second end of the power redundancy module; the second switching power supply is configured to convert the DC power output by the energy storage object into the power supply for the load.

[0014] Furthermore, in the power supply circuit provided in this application, the power redundancy module includes:

[0015] The first switch has one end electrically connected to the first end of the power redundancy module, and the other end electrically connected to the third end of the power redundancy module.

[0016] The second switch has one end electrically connected to the second terminal of the power redundancy module, and the other end electrically connected to the third terminal of the power redundancy module.

[0017] The control module is electrically connected to the control terminals of the first switch and the second switch, respectively.

[0018] The control module is configured to control the on / off state of the first switch and the second switch.

[0019] Furthermore, in the power supply circuit provided in this application, the power supply circuit includes two second power supply branches, and the energy storage objects corresponding to the two second power supply branches are the first battery cluster and the second battery cluster, respectively.

[0020] Specifically, when the first battery cluster is configured to supply power to the load, if the output voltage of the first battery cluster is lower than a preset voltage, the first battery cluster is configured to stop supplying power to the load, and the second battery cluster is configured to supply power to the load.

[0021] Furthermore, in the power supply circuit provided in this application, the first power supply branch also includes a first circuit breaker;

[0022] Wherein, the first terminal of the first circuit breaker is electrically connected to the mains power, and the second terminal of the first circuit breaker is electrically connected to the first terminal of the power redundancy module; or / and,

[0023] The second power supply branch also includes a shunt trip unit;

[0024] The first end of the shunt trip unit is electrically connected to the energy storage object, and the second end of the shunt trip unit is electrically connected to the second end of the power redundancy module.

[0025] Furthermore, in the power supply circuit provided in this application, the second power supply branch also includes an intermediate relay;

[0026] Among them, the first end of the intermediate relay is electrically connected to the battery management system of the energy storage system, the second and third ends of the intermediate relay are electrically connected to the third end of the power redundancy module, and the fourth end of the intermediate relay is electrically connected to the shunt trip end of the shunt trip unit.

[0027] The battery management system is configured to activate intermediate relays and shunt trip units.

[0028] Furthermore, in the power supply circuit provided in this application, the battery management system includes a main control board;

[0029] The main control board includes a board relay and a third switch;

[0030] The first terminal of the plate relay is electrically connected to the first terminal of the intermediate relay, the second terminal of the plate relay is grounded, the third terminal of the plate relay is electrically connected to the first terminal of the third switch, and the fourth terminal of the plate relay is electrically connected to the power supply terminal of the main control board.

[0031] The control terminal of the third switch is electrically connected to the control terminal of the main control board, and the second terminal of the third switch is grounded.

[0032] Furthermore, in the power supply circuit provided in this application, the load includes at least one of the orifice board, the main control board, and the master control board.

[0033] Secondly, this application also provides an energy storage system, which includes:

[0034] Such as the power supply circuit provided in the first aspect;

[0035] At least one battery cluster;

[0036] The combiner cabinet has its first and second ends electrically connected to both ends of the battery pack, and its third and fourth ends electrically connected to the target device.

[0037] Furthermore, in the energy storage system provided in this application, the battery cluster includes:

[0038] At least one battery pack;

[0039] A fuse, one end of which is electrically connected to one end of the battery pack;

[0040] A contactor, one end of which is electrically connected to the other end of a fuse;

[0041] The main circuit switch has its first and second terminals electrically connected to the other end of the battery pack and the other end of the contactor, respectively.

[0042] The high-voltage box has its first and second terminals electrically connected to the third and fourth terminals of the main circuit switch, respectively. The third and fourth terminals of the high-voltage box are also electrically connected to the first and second terminals of the combiner cabinet, respectively.

[0043] The pre-charging circuit is electrically connected at one end to one end of the contactor, and at the other end to the other end of the contactor.

[0044] The power supply circuit provided in this application includes a first power supply branch, at least one second power supply branch, and a power redundancy module. One end of the first power supply branch is electrically connected to the mains power, one end of the second power supply branch is electrically connected to the energy storage object of the energy storage system, the first end of the power redundancy module is electrically connected to the other end of the first power supply branch, the second end of the power redundancy module is electrically connected to the other end of the second power supply branch, and the third end of the power redundancy module is electrically connected to the load of the energy storage system. When the mains power fails, the first and third ends of the power redundancy module are disconnected, and the second and third ends of the power redundancy module are connected, and the energy storage object is configured to supply power to the load. When the mains power is not lost, the first and third ends of the power redundancy module are connected, and the second and third ends of the power redundancy module are disconnected, and the mains power is configured to supply power to the load. This avoids the need to configure an uninterruptible power supply in the energy storage system while ensuring continuous power supply to the load of the energy storage system, thereby reducing the installation and maintenance costs of the energy storage system. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 A schematic block diagram of an energy storage system provided in an embodiment of this application;

[0047] Figure 2 A circuit block diagram of the power supply circuit provided in the embodiments of this application;

[0048] Figure 3 Wiring diagram of the power supply circuit provided in the embodiments of this application;

[0049] Figure 4 The circuit control diagram of the power supply circuit provided in the embodiment of this application is shown. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0052] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0053] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0054] Furthermore, in this application, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific implementation.

[0055] This application provides a power supply circuit 100 and an energy storage system. The energy storage system includes the power supply circuit 100. For ease of understanding, this application will first provide a detailed description of the power supply circuit 100.

[0056] Please see Figure 1 , Figure 1 This is a schematic block diagram of an energy storage system provided in an embodiment of this application. Figure 1 As shown, this application provides a power supply circuit 100, which includes:

[0057] The first power supply branch 110, one end of which is electrically connected to the mains power supply 400;

[0058] At least one second power supply branch 120, one end of which is electrically connected to the energy storage object 200 of the energy storage system;

[0059] The power redundancy module 130 has its first terminal electrically connected to the other end of the first power supply branch 110, its second terminal electrically connected to the other end of the second power supply branch 120, and its third terminal electrically connected to the load 300 of the energy storage system.

[0060] Specifically, when the mains power 400 fails, the first and third terminals of the power redundancy module 130 are disconnected, while the second and third terminals of the power redundancy module 130 are connected, and the energy storage object 200 is configured to supply power to the load 300; when the mains power 400 is not lost, the first and third terminals of the power redundancy module 130 are connected, while the second and third terminals of the power redundancy module 130 are disconnected, and the mains power 400 is configured to supply power to the load 300.

[0061] In this embodiment, the power supply branch is located within the energy storage system, which can be embodied in the form of a centralized energy storage container. The first power supply branch 110 is configured as a path for the mains power 400 to supply power to the load 300 of the energy storage system, and the second power supply branch 120 is configured as a path for the energy storage object 200 of the energy storage system to supply power to the load 300 of the energy storage system.

[0062] Specifically, the energy storage object 200 of the energy storage system can be understood as the object that charges and discharges the energy storage system from the outside world. The energy storage object 200 can be one or more of the following: battery cells, battery modules, battery packs, and battery clusters. The mains power 400 can be understood as the general alternating current (AC) power supplied to homes and businesses through the power grid. Mains power 400 typically refers to industrial frequency AC power, with a frequency between 50Hz and 60Hz, and the voltage varies by region. The load 300 of the energy storage system can be understood as the load that controls the charging and discharging of the batteries in the energy storage system. This can be the battery management system of the energy storage system, specifically the slave control unit (BMU), main control unit (BCMU), and master control unit (MBMU) within the battery management system, but is not limited to these.

[0063] For example, such as Figure 2 and Figure 3As shown, the load 300 of the energy storage system can be a 24V load at the #1 cluster high-voltage box, the #2 cluster high-voltage box, or the #12 cluster high-voltage box, and its load can be 0.08W, such as the slave control board BMU of the battery pack, the main control board BCMU of the high-voltage box, and the 24V control module; in addition, the load 300 of the energy storage system can also be a 24V load at the combiner cabinet, and its load 300 can be 0.2W, such as the water immersion temperature and humidity, the main control board MBMU of the combiner cabinet, and the 24V control module.

[0064] The power redundancy module 130 can be understood as a switch module in the power supply branch. It can control either the mains power 400 or the energy storage object 200 to supply power to the load 300 of the energy storage system. Specifically, when the mains power 400 fails, the first and third terminals of the power redundancy module 130 are disconnected, and the second and third terminals of the power redundancy module 130 are connected, and the energy storage object 200 is configured to supply power to the load 300. When the mains power 400 is not lost, the first and third terminals of the power redundancy module 130 are connected, and the second and third terminals of the power redundancy module 130 are disconnected, and the mains power 400 is configured to supply power to the load 300.

[0065] The power supply circuit 100 provided in this application includes a first power supply branch 110, at least one second power supply branch 120, and a power redundancy module 130. One end of the first power supply branch 110 is electrically connected to the mains power 400, one end of the second power supply branch 120 is electrically connected to the energy storage object 200 of the energy storage system, the first end of the power redundancy module 130 is electrically connected to the other end of the first power supply branch 110, the second end of the power redundancy module 130 is electrically connected to the other end of the second power supply branch 120, and the third end of the power redundancy module 130 is electrically connected to the load 300 of the energy storage system. When the mains power 400 fails, the power redundancy module 130... When the first and third terminals of the redundant power supply module 130 are disconnected, the second and third terminals of the redundant power supply module 130 are connected, and the energy storage object 200 is configured to supply power to the load 300; when the mains power 400 is not interrupted, the first and third terminals of the redundant power supply module 130 are connected, and the second and third terminals of the redundant power supply module 130 are disconnected, and the mains power 400 is configured to supply power to the load 300. This avoids the need to configure an uninterruptible power supply in the energy storage system while ensuring continuous power supply to the load 300 of the energy storage system, thereby reducing the installation and maintenance costs of the energy storage system.

[0066] In some embodiments, when the mains power 400 is not interrupted, the voltage difference between the voltage output by the first power supply branch 110 and the voltage output by the second power supply branch 120 is greater than or equal to a preset voltage.

[0067] Specifically, when this application uses the energy storage object 200 of the energy storage system and the mains power 400 to provide dual power supply to the load 300 of the energy storage system, the energy storage object 200 corresponding to the second power supply branch 120 serves as a backup power source, only supplying power to the load 300 of the energy storage system in the event of a mains power failure. However, both the first power supply branch 110 and the second power supply branch 120 are in a conducting state. To ensure that the mains power 400 supplies power to the load 300 of the energy storage system, this application can use a power redundancy module 130 to detect the voltage output of the first power supply branch 110 and the voltage output of the second power supply branch 120, and determine whether the voltage difference between the voltage output of the first power supply branch 110 and the voltage output of the second power supply branch 120 is greater than or equal to a preset voltage, in order to determine whether there is a situation where the mains power 400 fails.

[0068] For example, the voltage output by the first power supply branch 110 can be 24.2V, the voltage output by the second power supply branch 120 can be 23.8V, and the voltage difference between the voltage output by the first power supply branch 110 and the voltage output by the second power supply branch 120 can be 0.4V. When the voltage difference between the voltage output by the first power supply branch 110 and the voltage output by the second power supply branch 120 is greater than or equal to 0.4V, it can be determined that the mains power 400 has not lost power, the first and third terminals of the power redundancy module 130 are connected, the second and third terminals of the power redundancy module 130 are disconnected, and the mains power 400 is configured to supply power to the load 300; when the voltage difference between the voltage output by the first power supply branch 110 and the voltage output by the second power supply branch 120 is less than 0.4V, it can be determined that the mains power 400 has lost power, the first and third terminals of the power redundancy module 130 are disconnected, the second and third terminals of the power redundancy module 130 are connected, and the energy storage object 200 is configured to supply power to the load 300. The preset voltage can be 0.4V.

[0069] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the first power supply branch 110 includes a first switching power supply 111; wherein, one end of the first switching power supply 111 is electrically connected to the mains power 400, and the other end of the first switching power supply 111 is electrically connected to the first end of the power redundancy module 130; the first switching power supply 111 is configured to convert the AC power output from the mains power 400 into the power supply for the load 300; the second power supply branch 120 includes a second switching power supply 121; wherein, one end of the second switching power supply 121 is electrically connected to the energy storage object 200, and the other end of the second switching power supply 121 is electrically connected to the second end of the power redundancy module 130; the second switching power supply 121 is configured to convert the DC power output from the energy storage object 200 into the power supply for the load 300.

[0070] In this embodiment, the first switching power supply 111 is equipped with an AC / DC converter, which can convert the AC power output from the mains power 400 into DC power, so that the mains power 400 can supply power to the energy storage object 200 of the energy storage system; the second switching power supply 121 is equipped with a DC / DC converter, which can convert the DC power output from the energy storage object 200 into DC power that matches the load 300, so that the energy storage object 200 can supply power to the energy storage object 200 of the energy storage system.

[0071] Since the load 300 of the energy storage object 200 mentioned in this application requires a large current, and there is no suitable first switching power supply 111 on the market to ensure that the mains power 400 supplies power to the load 300 of the energy storage object 200, this application can set two AC / DC converters in the first switching power supply 111, namely the first AC / DC converter PS1 and the second AC / DC converter PS2.

[0072] In some embodiments, such as Figure 1 , Figure 3 and Figure 4 As shown, the power redundancy module 130 includes:

[0073] The first switch has one end electrically connected to the first terminal of the power redundancy module 130, and the other end electrically connected to the third terminal of the power redundancy module 130.

[0074] The second switch has one end electrically connected to the second end of the power redundancy module 130, and the other end electrically connected to the third end of the power redundancy module 130.

[0075] The control module is electrically connected to the control terminals of the first switch and the second switch, respectively.

[0076] The control module is configured to control the on / off state of the first switch and the second switch.

[0077] In this embodiment, the control module can be a chip, which is electrically connected to the control terminals of the first switch and the second switch respectively, to control the on / off state of the first switch and the second switch; the first switch can control the mains power 400 to supply power to the load 300 of the energy storage system, and the first switch can be a MOS2 transistor; the second switch can control the energy storage object 200 to supply power to the load 300 of the energy storage system, and the second switch can be a MOS1 transistor.

[0078] Specifically, when the mains power 400 fails, the two ends of the first switch are disconnected and the two ends of the second switch are connected, and the energy storage object 200 is configured to supply power to the load 300; when the mains power 400 does not fail, the two ends of the first switch are connected and the two ends of the second switch are disconnected, and the mains power 400 is configured to supply power to the load 300.

[0079] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the power supply circuit 100 includes two second power supply branches 120, and the energy storage objects 200 corresponding to the two second power supply branches 120 are the first battery cluster and the second battery cluster, respectively; wherein, when the first battery cluster is configured to supply power to the load 300, if the output voltage of the first battery cluster is lower than the preset voltage, the first battery cluster is configured to stop supplying power to the load 300, and the second battery cluster is configured to supply power to the load 300.

[0080] In this embodiment, both the first and second battery clusters can serve as backup power sources for the load 300 of the energy storage system. Specifically, during the process of the first battery cluster supplying power to the load of the energy storage system, to prevent the first battery cluster from becoming depleted (i.e., to prevent over-discharge of the cells within the first battery cluster, which could cause irreversible capacity decay), it is necessary to stop the first battery cluster from supplying power to the load 300 and switch to the second battery cluster to supply power to the load 300. The output voltage of the first battery cluster can be obtained by acquiring the cell voltage from the control board BMU within the battery pack of the first battery cluster and sending it to the main control board BCMU in the high-voltage box of the first battery cluster. The main control board BCMU then transmits this data via communication to the main control board MBMU in the combiner cabinet for calculation. Furthermore, each of the two second power supply branches 120 is equipped with a DC / DC converter, namely the first DC / DC converter PS3 and the second DC / DC converter PS4.

[0081] When the mains power 400 is not interrupted, the first and third terminals of the power redundancy module 130 are connected, and the second and third terminals of the power redundancy module 130 are disconnected, and the mains power 400 is configured to supply power to the load 300; when the mains power 400 is interrupted, the first and third terminals of the power redundancy module 130 are disconnected, and the second and third terminals of the power redundancy module 130 are connected, and the first battery cluster is configured to supply power to the load 300; when the first battery cluster is configured to supply power to the load 300, if the output voltage of the first battery cluster is lower than the preset voltage, the first battery cluster is configured to stop supplying power to the load 300, and the second battery cluster is configured to supply power to the load 300.

[0082] In some embodiments, such as Figure 2 and Figure 3 As shown, the first power supply branch 110 also includes a first circuit breaker MCB3; wherein, the first end of the first circuit breaker MCB3 is electrically connected to the mains power 400, and the second end of the first circuit breaker MCB3 is electrically connected to the first end of the power redundancy module 130.

[0083] In this embodiment, the first circuit breaker MCB3 is located between the mains power 400 and the power redundancy module 130, specifically between the mains power 400 and the first switching power supply 111, which can control the mains power 400 to supply power to the load 300 of the energy storage system.

[0084] Specifically, a second circuit breaker MCB1 is also provided between the first circuit breaker MCB3 and the mains power 400. The mains power 400 can supply power to the remaining loads 300 of the energy storage system in sequence through the second circuit breaker MCB1 and the third circuit breaker MCB2. The first power supply branch 110 also includes a fuse FU3 and a surge protector SPD. One end of the fuse FU3 is electrically connected to the first circuit breaker MCB3, the second circuit breaker, and the third circuit breaker, respectively, and the other end of the fuse FU3 is grounded through the surge protector SPD.

[0085] In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, the second power supply branch 120 also includes a shunt trip unit; wherein, the first end of the shunt trip unit is electrically connected to the energy storage object 200, and the second end of the shunt trip unit is electrically connected to the second end of the power redundancy module 130.

[0086] In this embodiment, the shunt trip unit can be configured to control the second power supply branch 120 to supply power to the load 300 of the energy storage system. The shunt trip unit can be located between the energy storage object 200 and the power redundancy module 130, specifically between the energy storage object 200 and the second switching power supply 121.

[0087] Specifically, when the energy storage object 200 supplies power to the load 300 of the energy storage system, if the voltage of the energy storage object 200 is low, in order to avoid the energy storage object 200 being depleted, this application can control the shunt trip to trip, so as to cut off the second power supply branch 120 from supplying power to the load 300 of the energy storage system.

[0088] In some embodiments, such as Figure 4 As shown, the second power supply branch 120 also includes an intermediate relay; wherein, the first end of the intermediate relay is electrically connected to the battery management system of the energy storage system, the second and third ends of the intermediate relay are electrically connected to the third end of the power redundancy module 130, and the fourth end of the intermediate relay is electrically connected to the shunt trip end of the shunt trip unit; the battery management system is configured to turn on the intermediate relay and the shunt trip unit.

[0089] In this embodiment, the intermediate relay can cooperate with the shunt trip unit to disconnect the second power supply branch 120 from the load 300 of the energy storage system. When the energy storage object 200 supplies power to the load 300 of the energy storage system, both the shunt trip unit and the intermediate relay are in the normally open state. When the voltage of the energy storage object 200 is low, in order to avoid the energy storage object 200 from being depleted, the coil of the intermediate relay can be energized to close the intermediate relay. After the intermediate relay is closed, the coil of the shunt trip unit is energized to control the shunt trip unit to trip, thereby disconnecting the second power supply branch 120 from the load 300 of the energy storage system.

[0090] Specifically, such as Figure 4 As shown, when the power supply circuit 100 includes two second power supply branches 120, and the energy storage objects 200 corresponding to the two second power supply branches 120 are the first battery cluster and the second battery cluster respectively, the first battery cluster is equipped with a shunt trip unit MCB5 and an intermediate relay KA2, and the second battery cluster is equipped with a shunt trip unit MCB4 and an intermediate relay KA1.

[0091] In some embodiments, such as Figure 4 As shown, the battery management system includes a main control board (MBMU); the main control board (MBMU) includes a plate relay and a third switch; the first terminal of the plate relay is electrically connected to the first terminal of the intermediate relay, the second terminal of the plate relay is grounded, the third terminal of the plate relay is electrically connected to the first terminal of the third switch, and the fourth terminal of the plate relay is electrically connected to the power supply terminal of the main control board (MBMU); the control terminal of the third switch is electrically connected to the control terminal of the main control board (MBMU), and the second terminal of the third switch is grounded.

[0092] In this embodiment, the main control board (MBMU) can be located in the combiner cabinet and can control the on / off state of the shunt trip unit and the intermediate relay by controlling the on / off state of the board relay and the third switch. The third switch can be a transistor Q1. The base of transistor Q1 is electrically connected to the CPU on the MBMU through a resistor R1, the collector of transistor Q1 is electrically connected to the VCC pin of the MBMU through the coil of the board relay, and the emitter of transistor Q1 is grounded.

[0093] Specifically, such as Figure 4As shown, when it is necessary to stop the energy storage object 200 from supplying power to the load 300 of the energy storage system, the CPU can control the base of transistor Q1 to make the collector and emitter of transistor Q1 conduct, thereby energizing the coil of the plate relay. At this time, the normally open contact of the plate relay closes, and the pin D01 or pin D02 of the main control board MBMU is connected to the ground DC24-, thereby energizing the coil of the intermediate relay to close the normally open contact of the intermediate relay, which in turn causes the shunt trip to trip, thus stopping the energy storage object 200 from supplying power to the load 300 of the energy storage system. The plate relay is electrically connected to the ground DC24- through pin COM1 or pin COM2 of the main control board MBMU.

[0094] In addition, when powering the main control board MBMU, this application can use the DC24 pin of the main control board MBMU. At the same time, when the main control board BCMU and the main control board MBMU communicate, the two contacts H and L of the CAN pin of the main control board MBMU can be used.

[0095] In some embodiments, this application also provides an energy storage system, comprising:

[0096] The power supply circuit 100 provided in this application embodiment;

[0097] At least one battery cluster;

[0098] The combiner cabinet has its first and second ends electrically connected to both ends of the battery pack, and its third and fourth ends electrically connected to the target device.

[0099] In this embodiment, the energy storage system may include multiple battery clusters. Each battery cluster can be electrically connected to a combiner cabinet via two busbars, and then electrically connected to a target device via the combiner cabinet. The target device may be an energy storage converter.

[0100] In some embodiments, the battery cluster includes:

[0101] At least one battery pack;

[0102] A fuse, one end of which is electrically connected to one end of the battery pack;

[0103] A contactor, one end of which is electrically connected to the other end of a fuse;

[0104] The main circuit switch QF1 is electrically connected to the other end of the battery pack and the other end of the contactor, respectively, at its first and second terminals.

[0105] The high-voltage box has its first and second terminals electrically connected to the third and fourth terminals of the main circuit switch QF1, respectively. The third and fourth terminals of the high-voltage box are also electrically connected to the first and second terminals of the combiner cabinet, respectively.

[0106] The pre-charging circuit is electrically connected at one end to one end of the contactor, and at the other end to the other end of the contactor.

[0107] In this embodiment, as Figure 3 As shown, a shunt SH1, fuse, contactor, pre-charge circuit, main circuit switch QF1, and Hall sensor are installed between the battery pack and the high-voltage box. Specifically, as... Figure 3 As shown, the contactor includes a main positive contactor control KM1 and a main negative contactor KM2, and the fuses include a main positive fuse FU1 and a main negative fuse FU2. The pre-charging circuit is connected in parallel with the main positive contactor control KM1 and includes a pre-charging resistor and a circulating current contactor KM3 connected in series. One end of the main positive contactor control KM1 is electrically connected to the positive terminal B+ of the battery pack through the main positive fuse FU1, and the other end of the main positive contactor control KM1 is electrically connected to the port P+ of the high-voltage box through the main circuit switch QF1 and the Hall sensor in sequence. One end of the main negative contactor KM2 is electrically connected to the negative terminal B- of the battery pack through the main negative fuse FU2 and the shunt SH1 in sequence, and the other end of the main negative contactor KM2 is electrically connected to the port P- of the high-voltage box through the main circuit switch QF1.

[0108] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply circuit, characterized in that, include: The first power supply branch, one end of which is electrically connected to the mains power supply; At least one second power supply branch, one end of which is electrically connected to the energy storage object of the energy storage system; A power redundancy module, wherein a first terminal of the power redundancy module is electrically connected to the other end of the first power supply branch, a second terminal of the power redundancy module is electrically connected to the other end of the second power supply branch, and a third terminal of the power redundancy module is electrically connected to the load of the energy storage system. Specifically, when the mains power fails, the first and third terminals of the power redundancy module are disconnected, while the second and third terminals of the power redundancy module are connected, and the energy storage object is configured to supply power to the load; when the mains power is not lost, the first and third terminals of the power redundancy module are connected, while the second and third terminals of the power redundancy module are disconnected, and the mains power is configured to supply power to the load.

2. The power supply circuit according to claim 1, characterized in that, When the mains power is not interrupted, the voltage difference between the voltage output by the first power supply branch and the voltage output by the second power supply branch is greater than or equal to a preset voltage.

3. The power supply circuit according to claim 1, characterized in that, The first power supply branch includes a first switching power supply; Wherein, one end of the first switching power supply is electrically connected to the mains power, and the other end of the first switching power supply is electrically connected to the first end of the power redundancy module; the first switching power supply is configured to convert the AC power output from the mains power into the power supply for the load; or / and, The second power supply branch includes a second switching power supply; Wherein, one end of the second switching power supply is electrically connected to the energy storage object, and the other end of the second switching power supply is electrically connected to the second end of the power redundancy module; the second switching power supply is configured to convert the DC power output by the energy storage object into the power supply for the load.

4. The power supply circuit according to claim 1, characterized in that, The power redundancy module includes: A first switch, one end of which is electrically connected to the first terminal of the power redundancy module, and the other end of which is electrically connected to the third terminal of the power redundancy module; The second switch has one end electrically connected to the second terminal of the power redundancy module, and the other end electrically connected to the third terminal of the power redundancy module. The control module is electrically connected to the control terminals of the first switch and the second switch, respectively. The control module is configured to control the on / off state of the first switch and the second switch.

5. The power supply circuit according to claim 1, characterized in that, The power supply circuit includes two second power supply branches, and the energy storage objects corresponding to the two second power supply branches are the first battery cluster and the second battery cluster, respectively. When the first battery cluster is configured to supply power to the load, if the output voltage of the first battery cluster is lower than a preset voltage, the first battery cluster is configured to stop supplying power to the load, and the second battery cluster is configured to supply power to the load.

6. The power supply circuit according to any one of claims 1-5, characterized in that, The first power supply branch also includes a first circuit breaker; Wherein, the first terminal of the first circuit breaker is electrically connected to the mains power, and the second terminal of the first circuit breaker is electrically connected to the first terminal of the power redundancy module; or / and, The second power supply branch also includes a shunt trip unit; Wherein, the first terminal of the shunt trip unit is electrically connected to the energy storage object, and the second terminal of the shunt trip unit is electrically connected to the second terminal of the power redundancy module; or / and, The load includes at least one of the orifice plate, the main control board, and the master control board.

7. The power supply circuit according to claim 6, characterized in that, The second power supply branch also includes an intermediate relay; The first terminal of the intermediate relay is electrically connected to the battery management system of the energy storage system, the second and third terminals of the intermediate relay are electrically connected to the third terminal of the power redundancy module, and the fourth terminal of the intermediate relay is electrically connected to the shunt trip terminal of the shunt trip unit. The battery management system is configured to activate the intermediate relay and the shunt trip unit.

8. The power supply circuit according to claim 7, characterized in that, The battery management system includes a main control board; The main control board includes a board relay and a third switch; The first terminal of the plate relay is electrically connected to the first terminal of the intermediate relay, the second terminal of the plate relay is grounded, the third terminal of the plate relay is electrically connected to the first terminal of the third switch, and the fourth terminal of the plate relay is electrically connected to the power supply terminal of the main control board. The control terminal of the third switch is electrically connected to the control terminal of the main control board, and the second terminal of the third switch is grounded.

9. An energy storage system, characterized in that, include: The power supply circuit as described in any one of claims 1-8; At least one battery cluster; The combiner cabinet has its first and second ends electrically connected to both ends of the battery cluster, and its third and fourth ends electrically connected to the target device.

10. The energy storage system according to claim 9, characterized in that, The battery cluster includes: At least one battery pack; A fuse, one end of which is electrically connected to one end of the battery pack; A contactor, one end of which is electrically connected to the other end of the fuse; A main circuit switch, wherein the first and second terminals of the main circuit switch are respectively electrically connected to the other end of the battery pack and the other end of the contactor; A high-voltage box, wherein the first and second ends of the high-voltage box are electrically connected to the third and fourth ends of the main circuit switch, respectively, and the third and fourth ends of the high-voltage box are electrically connected to the first and second ends of the combiner cabinet, respectively. A pre-charging circuit, one end of which is electrically connected to one end of the contactor, and the other end of which is electrically connected to the other end of the contactor.

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