High-voltage box control circuit, high-voltage box, energy storage system

Abstract

The present application provides a high-voltage box control circuit, a high-voltage box, and an energy storage system. A main control circuit in the circuit is configured to connect a battery pack and an external power system; a circuit-breaking module is provided in the main control circuit, and the circuit-breaking module is configured for opening or closing the main control circuit; a control module is connected to the circuit-breaking module and the main control circuit, and the control module is configured for controlling the connection / disconnection of the circuit-breaking module according to an acquired signal of the main control circuit, thereby achieving control of the connection / disconnection of the circuit, and improving the safety of the circuit without reducing the performance of the high-voltage box. The present application provides protection for a power supply line by means of a circuit-breaking module opening or closing a main control circuit. When the power supply line experiences faults such as severe overload, short circuits, or undervoltage, the circuit-breaking module automatically trips the circuit, preventing fault escalation, ensuring safe circuit operation, reducing failure points in high-voltage boxes, and reducing high-voltage box failure rates.

Description

A high-voltage box control circuit, a high-voltage box and an energy storage system

[0001] This application claims priority to Chinese Patent Application No. 202520037972.1, filed with the Chinese Patent Office on January 7, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of energy storage technology, and in particular to a high-voltage box control circuit, a high-voltage box, and an energy storage system. Background Technology

[0003] A battery pack consists of several individual battery cells connected in series or in parallel, or in combination of any two of them. Several battery packs connected in series and / or in parallel are then connected to a high-voltage box to form a battery cluster. The main function of the high-voltage box is to control the connection or disconnection of the main electrical circuit of the system within the battery cluster. Technical issues

[0004] Currently, in the design of high-voltage box circuits, contactors are usually used to connect or disconnect the load current. However, when the load is large, it can cause circuit failures and cannot directly cut off the short-circuit current, resulting in low circuit safety. Technical solutions

[0005] In a first aspect, this application provides a high-voltage box control circuit, comprising:

[0006] The main control circuit is configured to connect the battery pack and an external power system.

[0007] The circuit breaker module is installed in the main control circuit and is configured to disconnect or close the main control circuit.

[0008] The control module connects the circuit breaker module and the main control circuit. The control module is configured to control the on / off state of the circuit breaker module based on the signals acquired by the main control circuit.

[0009] Secondly, this application provides a high-voltage box, including a box body and a high-voltage box control circuit as described in any of the above claims; the main control circuit and control module are disposed inside the box body, and the circuit breaker module is disposed on one side of the box body.

[0010] Thirdly, this application provides an energy storage system, including the high-voltage box as described above. Beneficial effects

[0011] This application provides a high-voltage box control circuit, a high-voltage box, and an energy storage system, including a main control circuit, a circuit breaker module, and a control module. The main control circuit is configured to connect the battery pack and an external power system. The circuit breaker module is located in the main control circuit and is configured to disconnect or close the main control circuit. The control module connects the circuit breaker module and the main control circuit and is configured to control the on / off state of the circuit breaker module based on the acquired signals from the main control circuit, thereby achieving on / off control of the circuit. This improves the safety of the circuit without reducing the performance of the high-voltage box. This application protects the power line by disconnecting or connecting the main control circuit through the circuit breaker module. When the power line experiences a serious overload, short circuit, or undervoltage fault, the circuit breaker module will automatically disconnect the circuit to prevent the accident from escalating, ensure the safe operation of the circuit, reduce the number of fault points in the high-voltage box, and lower the failure rate of the high-voltage box. Attached Figure Description

[0012] Figure 1 is a schematic diagram of the first circuit structure of the high-voltage box control circuit in some implementations of this application;

[0013] Figure 2 is a schematic diagram of the second circuit structure of the high-voltage box control circuit in some implementations of this application;

[0014] Figure 3 is a schematic diagram of the third circuit structure of the high-voltage box control circuit in some implementations of this application;

[0015] Figure 4 is a schematic diagram of the fourth structure of the high-voltage box in some implementations of this application.

[0016] Figure label:

[0017] 10. Main control circuit; 110. Main positive circuit; 112. First positive port; 114. Second positive port; 116. First fuse; 118. Electrical signal sensor; 120. Balancing branch; 122. First relay; 124. First resistor; 130. Main negative circuit; 132. First negative port; 134. Second negative port; 136. Second fuse; 138. Shunt; 20. Circuit breaker module; 210. First circuit breaker... Module 212; First circuit breaker; 214; First electric operating mechanism; 216; First shunt trip unit; 220; Second circuit breaker module; 222; Second circuit breaker; 224; Second electric operating mechanism; 226; Second shunt trip unit; 30; Control module; 310; Voltage acquisition port; 320; Circuit breaker control port; 330; Indicator light control port; 40; Battery pack; 50; External power system; 60; Housing. Embodiments of the present invention

[0018] In traditional high-voltage boxes, the electrical circuits are typically controlled by contactors. However, contactors cannot interrupt short-circuit currents, and poor contact at the contactor contacts, especially under heavy loads, can easily lead to arcing, causing the contacts to burn out or stick together. In addition, contactors have a short lifespan; arcing and heat loss may occur during current switching, further shortening their service life. After long-term use, contactors may wear down, affecting their conductivity. Moreover, the contactors in high-voltage boxes lack physical switches, making it inconvenient to observe their engagement and disengagement states and hindering maintenance.

[0019] In the high-voltage box control circuit of this application, a circuit breaker module is set in the main control circuit. Based on the control module connecting the circuit breaker module and the main control circuit, the circuit breaker module can cut off or connect the circuit, thus protecting the power line. When the power line experiences a serious overload, short circuit, or undervoltage fault, the circuit breaker module will automatically cut off the circuit to prevent the accident from escalating and ensure safe operation. In addition, after the circuit breaker module interrupts the fault current, the corresponding components do not need to be changed, which can reduce subsequent maintenance costs. Moreover, the circuit breaker has multiple protection functions, including overload protection, short circuit protection, and undervoltage protection. The operation of the circuit breaker module is adjustable, with high breaking capacity, and it is convenient and safe to operate.

[0020] In some implementations, as shown in Figure 1, a high-voltage box control circuit is provided, including a main control circuit 10, a circuit breaker module 20, and a control module 30. The main control circuit 10 is configured to connect a battery pack 40 and an external power system 50. The circuit breaker module 20 is disposed in the main control circuit 10 and is configured to cut off or close the main control circuit 10. The control module 30 is connected to the circuit breaker module 20 and the main control circuit 10, and is configured to control the on / off state of the circuit breaker module 20 according to the acquired signals from the main control circuit 10.

[0021] The high-voltage box control circuit should be configured within the high-voltage box, which can be used in energy storage systems. For example, an energy storage system may include several battery clusters, each controlled by a corresponding high-voltage box.

[0022] The battery pack 40 is composed of individual battery packs within a corresponding battery cluster. For example, the battery pack 40 may include several battery packs connected in series and / or parallel to form the battery pack 40. Each battery pack may include several individual battery cells connected in series and / or parallel to form the battery pack. Each individual battery cell may be a lithium-ion cell, such as a lithium iron phosphate cell, ternary lithium cell, or lithium manganese iron phosphate cell. The shape of the individual battery cell may be, but is not limited to, square or cylindrical; the individual battery cell may be a laminated or wound cell. The external power system 50 may be an AC power system, such as a substation.

[0023] The main control circuit 10 is connected between the battery pack 40 and the external power system 50. The main control circuit 10 can be used to control the external power system 50 to transfer electrical energy to the battery pack 40, thereby charging the battery pack 40; the main control circuit 10 can also be used to control the battery pack 40 to transfer electrical energy to the external power system 50, thereby discharging the battery pack 40. It should be noted that when the main control circuit 10 is disconnected, the power transfer process between the battery pack 40 and the external power system 50 is interrupted.

[0024] The circuit breaker module 20 can be used to control the opening and closing of the main control circuit 10. For example, when the control module 30 transmits an open signal to the circuit breaker module 20, the circuit breaker module 20 cuts off the main control circuit 10, thereby disconnecting the battery pack 40 from the external power system 50, thus disconnecting the charging and discharging of the battery pack 40; when the control module 30 transmits a close signal to the circuit breaker module 20, the circuit breaker module 20 closes the main control circuit 10, thereby connecting the battery pack 40 to the external power system 50, thus enabling the charging and discharging of the battery pack 40.

[0025] The control module 30 can be a BCMU (Battery Cluster Management Unit). Based on the connection of the control module 30 to the main control circuit 10, the control module 30 can collect the electrical signals of the main control circuit 10 and obtain the collected signals. Based on the connection of the control module 30 to the circuit breaker module, the control module 30 controls the opening and closing of the circuit breaker module 20 according to the collected signals.

[0026] During the power-on process of the high-voltage box control circuit, after all circuit harnesses are installed, the high-voltage box control circuit is powered on. The control module 30 performs a self-test after being energized. If no circuit fault is detected, the control module 30 controls the circuit breaker module 20 to close, indicating a successful power-on. If a circuit fault is detected, the control module 30 controls the circuit breaker module 20 to open, indicating a failed power-on. During the power-off process of the high-voltage box control circuit, when the control module 30 receives a power-off command, it controls the circuit breaker module 20 to open and performs electrical signal acquisition on the main control circuit 10. If the acquired signal meets the requirements (e.g., the voltage of the acquired signal is 0), the power-off is considered successful; if the acquired signal does not meet the requirements (e.g., the voltage of the acquired signal is greater than 0), the power-off is considered a failed power-off. During the operation of the high-voltage box control circuit, the control module 30 can also collect electrical signals during the operation of the main control circuit 10 to detect faults such as overload, open circuit and undervoltage in the main control circuit 10. When an overload, open circuit or undervoltage fault is detected in the main control circuit 10, the control module 30 can control the circuit breaking module 20 to cut off the circuit, so that the circuit breaking module 20 can automatically cut off the main control circuit 10, thereby improving the safety of the circuit and reducing the failure rate of the circuit.

[0027] The high-voltage box control circuit includes a main control circuit 10, a circuit breaker module 20, and a control module 30. The main control circuit 10 is configured to connect the battery pack 40 and the external power system 50. The circuit breaker module 20 is located in the main control circuit 10 and is configured to cut off or close the main control circuit 10. The control module 30 connects the circuit breaker module 20 and the main control circuit 10. The control module 30 is configured to control the on / off state of the circuit breaker module 20 based on the acquired signals from the main control circuit 10, thereby achieving on / off control of the circuit. This improves the safety of the circuit without reducing the performance of the high-voltage box. This application protects the power line by cutting off or connecting the main control circuit 10 through the circuit breaker module 20. When the power line experiences a serious overload, short circuit, or undervoltage fault, the circuit breaker module 20 will automatically cut off the circuit to prevent the accident from escalating, ensure the safe operation of the circuit, reduce the number of fault points in the high-voltage box, and lower the failure rate of the high-voltage box.

[0028] In some implementations, as shown in Figure 2, the main control circuit 10 includes a main positive circuit 110 and a main negative circuit 130; the circuit breaker module 20 includes a first circuit breaker module 210 and a second circuit breaker module 220; the first circuit breaker module 210 is disposed in the main positive circuit 110 and is configured to cut off or close the main positive circuit 110; the second circuit breaker module 220 is disposed in the main negative circuit 130 and is configured to cut off or close the main negative circuit 130; the control module 30 connects the first circuit breaker module 210, the second circuit breaker module 220, the main positive circuit 110, and the main negative circuit 130.

[0029] The main positive circuit 110 has a first terminal and a second terminal. The first terminal of the main positive circuit 110 is connected to the positive terminal of the battery pack 40, and the second terminal of the main positive circuit 110 is connected to the positive terminal of the external power system 50. The main negative circuit 130 has a first terminal and a second terminal. The first terminal of the main negative circuit 130 is connected to the negative terminal of the battery pack 40, and the second terminal of the main negative circuit 130 is connected to the negative terminal of the external power system 50.

[0030] The first circuit breaker module 210 can be used to control the opening and closing of the main positive circuit 110, and the second circuit breaker module 220 can be used to control the opening and closing of the main negative circuit 130. For example, when the control module 30 transmits a disconnect signal to the first circuit breaker module 210, the first circuit breaker module 210 cuts off the main positive circuit 110, thereby disconnecting the positive connection between the battery pack 40 and the external power system 50; when the control module 30 transmits a close signal to the first circuit breaker module 210, the first circuit breaker module 210 closes the main positive circuit 110, thereby connecting the positive connection between the battery pack 40 and the external power system 50. When the control module 30 transmits a disconnect signal to the second circuit breaker module 220, the second circuit breaker module 220 cuts off the main negative circuit 130, thereby disconnecting the negative terminal connection between the battery pack 40 and the external power system 50; when the control module 30 transmits a close signal to the second circuit breaker module 220, the second circuit breaker module 220 closes the main negative circuit 130, thereby connecting the negative terminal connection between the battery pack 40 and the external power system 50.

[0031] The control module 30 can collect electrical signals during the operation of the main positive circuit 110 and the main negative circuit 130 to detect faults such as overload, open circuit and undervoltage in the main positive circuit 110 and the main negative circuit 130. When an overload, open circuit or undervoltage fault is detected in the main control circuit 10, the control module 30 can control the first circuit breaker module 210 or the second circuit breaker module 220 to cut off the circuit. The first circuit breaker module 210 automatically cuts off the main positive circuit 110 and the second circuit breaker module 220 automatically cuts off the main negative circuit 130, thereby improving the safety of the circuit and reducing the failure rate of the circuit.

[0032] In some implementations, as shown in Figure 3, the main positive circuit 110 includes a first positive port 112, a second positive port 114, a first fuse 116, and an electrical signal sensor 118. The first end of the first fuse 116 is connected to the first positive port 112, the second end of the first fuse 116 is connected to the first circuit breaker module 210, the first circuit breaker module 210 is connected to the first end of the electrical signal sensor 118, and the second end of the electrical signal sensor 118 is connected to the second positive port 114.

[0033] The first positive port 112 (B+ port) is used to connect to the positive terminal of the battery pack 40, and the second positive port 114 (P+ port) is used to connect to the positive terminal of the external power system 50. The first fuse 116 is used to blow when the current in the main positive circuit 110 exceeds a set value, thereby disconnecting the main positive circuit 110 and providing overcurrent protection to prevent circuit damage. The electrical signal sensor 118 can be a Hall sensor, used to detect the voltage or current signal in the main positive circuit 110. For example, the electrical signal sensor 118 is connected to the control module 30, which can then control the channels of the first circuit breaker module 210 and / or the second circuit breaker module 220 based on the electrical signal detected by the sensor 118, automatically cutting off the main positive circuit 110. This improves circuit safety, reduces circuit failure rate, extends product lifespan, reduces the number of switching devices in the high-voltage box, and makes the main positive circuit 110 simpler and more efficient.

[0034] In some implementations, as shown in Figure 3, the main negative circuit 130 includes a first negative terminal 132, a second negative terminal 134, a second fuse 136, and a shunt 138; the first end of the shunt 138 is connected to the first negative terminal 132, the second end of the shunt 138 is connected to the first end of the second fuse 136, the second end of the fuse is connected to the second circuit breaker module 220, and the second circuit breaker module 220 is connected to the second negative terminal 134.

[0035] The first negative port 132 (B-port) is used to connect to the negative terminal of the battery pack 40, and the second negative port 134 (P-port) is used to connect to the negative terminal of the external power system 50. The second fuse 136 is used to blow when the current in the main negative circuit 130 exceeds a set value, thereby disconnecting the main negative circuit 130 and providing overcurrent protection to prevent circuit damage. The shunt 138 can control the on / off state of the circuit to achieve power distribution and isolation. When a circuit fault occurs, the shunt 138 will automatically isolate the faulty component, protecting the normal operation of other electrical equipment and thus enhancing circuit safety.

[0036] The shunt 138, the second fuse 136, and the second circuit breaker are connected in series between the first negative terminal 132 and the second negative terminal 134. When the main negative circuit 130 experiences overcurrent, the second fuse 136 can blow in time. When it is necessary to detect electrical signals in the main negative circuit 130, the shunt 138 can be used for current shunting detection. When the control module 30 detects overload, open circuit, or undervoltage faults in the main negative circuit 130, the control module 30 can control the second circuit breaker module 220 to cut off the main negative circuit 130, thereby improving circuit safety, reducing the number of fault points in the high-voltage box, and lowering the circuit failure rate.

[0037] In some implementations, as shown in Figure 3, the first circuit breaker module 210 includes a first circuit breaker 212 and a first electric operating mechanism 214; the first selection terminal of the first circuit breaker 212 is connected to the second terminal of the first fuse 116, and the second selection terminal of the first circuit breaker 212 is connected to the first terminal of the electrical signal sensor 118; the first terminal of the first electric operating mechanism 214 is connected to the first control terminal of the first circuit breaker 212, the second terminal of the first electric operating mechanism 214 is connected to the control module 30, and the third terminal of the first electric operating mechanism 214 is configured to be connected to a power supply.

[0038] The first circuit breaker 212 can be used to cut off or close the main positive circuit 110, and the first electric operating mechanism 214 can be used to remotely and automatically open and close the first circuit breaker 212, realizing remote control of the opening and closing operation of the first circuit breaker 212 without manual operation. The power supply is used to supply power to the first electric operating mechanism 214, and the power supply can be a 24V DC power supply.

[0039] The first electric operating mechanism 214 is connected to the first circuit breaker 212. The first electric operating mechanism 214 is also connected to the control module 30 and the power supply. When the control module 30 powers on the high-voltage box control circuit, it performs a self-test. If no fault is detected in the circuit, the control module 30 transmits a closing command to the first electric operating mechanism 214, which then controls the first circuit breaker 212 to close and the second circuit breaker module 220 to close, thus successfully powering on. If a fault is detected in the circuit, the control module 30 transmits a disconnect command to the first electric operating mechanism 214, which then controls the first circuit breaker 212 to open and the second circuit breaker module 220 to open, thus failing to power on. When the high-voltage box control circuit is powered down, the control module 30 transmits a disconnect command to the first electric operating mechanism 214. The first electric operating mechanism 214 then controls the first circuit breaker 212 to open, and also controls the second circuit breaker module 220 to open. Simultaneously, it collects electrical signals from the main control circuit 10. If the collected signals meet the requirements, the power-down is successful. During the operation of the high-voltage box control circuit, the control module 30 can also detect overload, open circuit, and undervoltage faults in the main positive circuit 110. When an overload, open circuit, or undervoltage fault is detected in the main positive circuit 110, the control module 30 transmits a disconnect command to the first electric operating mechanism 214. The first electric operating mechanism 214 then controls the first circuit breaker 212 to open, enabling the circuit breaker module 20 to automatically disconnect the main positive circuit 110, thereby improving circuit safety and reducing the circuit failure rate.

[0040] In some implementations, as shown in Figure 3, the first circuit breaker module 210 further includes a first shunt trip unit 216; the first end of the first shunt trip unit 216 is connected to the second control terminal of the first circuit breaker 212, the second end of the first shunt trip unit 216 is connected to the control module 30, and the third end of the first shunt trip unit 216 is configured to be connected to the power supply.

[0041] The first shunt trip unit 216 utilizes the interaction force established by the magnetic field to help limit the electric arc generated by the first circuit breaker 212 during the breaking process, thereby ensuring the safe operation of the equipment. The power supply is used to supply power to the first shunt trip unit 216 to ensure that the first circuit breaker module 210 can operate normally even in the event of a main power failure; the power supply can be a 24V DC power supply.

[0042] Based on the first shunt trip unit 216 connected to the first circuit breaker 212, and the first shunt trip unit 216 connected to the control module 30 and the power supply respectively, when the control module 30 transmits a disconnect command to the first electric operating mechanism 214 and at the same time transmits a disconnect command to the first shunt trip unit 216, and the first electric operating mechanism 214 controls the first circuit breaker 212 to open, it avoids the first circuit breaker 212 from generating an electric arc when cutting off the current, thereby improving the service life of the first circuit breaker module 210 and ensuring the safe operation of the circuit.

[0043] In some implementations, as shown in Figure 3, the second circuit breaker module 220 includes a second circuit breaker 222 and a second electric operating mechanism 224; the first selection terminal of the second circuit breaker 222 is connected to the second terminal of the second fuse 136, and the second selection terminal of the second circuit breaker 222 is connected to the second negative terminal 134; the first terminal of the second electric operating mechanism 224 is connected to the first control terminal of the second circuit breaker 222, the second terminal of the second electric operating mechanism 224 is connected to the control module 30, and the third terminal of the second electric operating mechanism 224 is configured to be connected to a power supply.

[0044] The second circuit breaker 222 can be used to cut off or close the main negative circuit 130, and the second electric operating mechanism 224 can be used to remotely and automatically open and close the second circuit breaker 222, realizing remote control of the opening and closing operation of the second circuit breaker 222 without manual operation. The power supply is used to supply power to the second electric operating mechanism 224, and the power supply can be a 24V DC power supply.

[0045] The second electric operating mechanism 224 is connected to the second circuit breaker 222. The second electric operating mechanism 224 is connected to the control module 30 and the power supply. When the control module 30 powers on the high-voltage box control circuit, it performs a self-test. If no fault is detected in the circuit, the control module 30 transmits a closing command to the second electric operating mechanism 224, which then controls the second circuit breaker 222 to close and the first circuit breaker module 210 to close, thus successfully powering on. If a fault is detected in the circuit, the control module 30 transmits a disconnect command to the second electric operating mechanism 224, which then controls the second circuit breaker 222 to open and the first circuit breaker module 210 to open, thus failing to power on. When the high-voltage box control circuit is powered down, the control module 30 transmits a disconnect command to the second electric operating mechanism 224. The second electric operating mechanism 224 then controls the second circuit breaker 222 to open, and also controls the first circuit breaker module 210 to open. Simultaneously, it collects electrical signals from the main control circuit 10. If the collected signals meet the requirements, the power-down is successful. During the operation of the high-voltage box control circuit, the control module 30 can also detect overload, open circuit, and undervoltage faults in the main negative circuit 130. When an overload, open circuit, or undervoltage fault is detected in the main negative circuit 130, the control module 30 transmits a disconnect command to the second electric operating mechanism 224. The second electric operating mechanism 224 then controls the second circuit breaker 222 to open, enabling the circuit breaker module 20 to automatically disconnect the main negative circuit 130, thereby improving circuit safety and reducing the circuit failure rate.

[0046] In some implementations, as shown in Figure 3, the second circuit breaker module 220 further includes a second shunt trip unit 226; the first end of the second shunt trip unit 226 is connected to the second control terminal of the second circuit breaker 222, the second end of the second shunt trip unit 226 is connected to the control module 30, and the third end of the second shunt trip unit 226 is configured to be connected to the power supply.

[0047] The second shunt trip unit 226 utilizes the interaction force established by the magnetic field to help limit the electric arc generated during the breaking process of the second circuit breaker 222, thereby ensuring the safe operation of the equipment. The power supply is used to supply power to the second shunt trip unit 226 to ensure that the second circuit breaker module 220 can operate normally even in the event of a main power failure; the power supply can be a 24V DC power supply.

[0048] Based on the second shunt trip unit 226 connected to the second circuit breaker 222, and the second shunt trip unit 226 connected to the control module 30 and the power supply respectively, when the control module 30 transmits a disconnect command to the second electric operating mechanism 224 and simultaneously transmits a disconnect command to the second shunt trip unit 226, and the second electric operating mechanism 224 controls the second circuit breaker 222 to open, it avoids the second circuit breaker 222 from generating an arc when cutting off the current, thereby improving the service life of the second circuit breaker module 220 and ensuring the safe operation of the circuit.

[0049] In some implementations, as shown in Figure 3, the main positive circuit 110 also includes a balancing branch 120; the first end of the balancing branch 120 is connected to the second end of the first fuse 116, and the second end of the balancing branch 120 is connected to the first end of the electrical signal sensor 118.

[0050] The equalization branch 120 can be used to limit surge current, protect the circuit from damage, extend its service life, and improve reliability.

[0051] As shown in Figure 3, the equalization branch 120 includes a first relay 122 and a first resistor 124; the first end of the first relay 122 is connected to the second end of the first fuse 116, the second end of the first relay 122 is connected to the first end of the first resistor 124, and the second end of the first resistor 124 is connected to the first end of the electrical signal sensor 118.

[0052] The first resistor 124 is a pre-charging resistor, and the first relay 122 is a circulating current relay. Based on the first resistor 124 and the first relay 122 connected in series to form a balancing branch 120, and the balancing branch 120 being connected in parallel with the first circuit breaker module 210, during the pre-charging stage of the high-voltage box, as the voltage of the battery pack 40 begins to rise, the first resistor 124 restricts the current flow, slowing down the voltage rise rate. This limits the charging current of the energy storage box during the pre-charging stage, preventing excessive current from causing arcing or overcurrent, thereby protecting the safe operation of the battery pack 40 and the external power system 50.

[0053] In some implementations, as shown in Figure 3, the control module 30 includes a voltage acquisition port 310, a circuit breaker control port 320, and an indicator light control port 330. The voltage acquisition port 310 is connected to the main control circuit 10, the circuit breaker control port 320 is connected to the circuit breaker module 20, and the indicator light control port 330 is configured to connect to the indicator light group.

[0054] The voltage acquisition port 310 can be connected to the main positive circuit 110 and the main negative circuit 130 to acquire voltage data from both circuits. The circuit breaker control port 320 is used to connect the first circuit breaker module 210 and the second circuit breaker module 220. For example, the port control port may include a first electrical control interface, a second electrical control interface, a first shunt trip control interface, and a second shunt trip control interface.

[0055] The indicator light group may include fault indicator lights and running indicator lights. The indicator light control port 330 may include a first indicator light interface and a second indicator light interface. The first indicator light interface is connected to the fault indicator light, and the second indicator light interface is connected to the running indicator light.

[0056] For example, during the power-on process of the high-voltage box control circuit, if no fault is detected in the circuit, the control module 30 controls the circuit breaker module 20 to close and the operation indicator light to illuminate, thus determining that the power-on is successful. If a fault is detected in the circuit, the control module 30 controls the circuit breaker module 20 to open and the operation indicator light to turn off, thus determining that the power-on has failed. During the power-off process of the high-voltage box control circuit, when the control module 30 receives a power-off command, it controls the circuit breaker module 20 to open and performs electrical signal acquisition on the main control circuit 10. If the acquired signal meets the requirements (e.g., the voltage of the acquired signal is 0) and the fault indicator light illuminates, then the power-off is successful. If the acquired signal does not meet the requirements (e.g., the voltage of the acquired signal is greater than 0) and the fault indicator light turns off, then the power-off has failed, thus facilitating the operator to check the operating status of the high-voltage box control circuit.

[0057] In some implementations, the main control circuit 10 can be connected via a first conductive busbar, which can be a copper busbar with a cross-sectional area of ​​25*3mm². The first fuse 116 and the second fuse 136 can be equipped with a second conductive busbar, which can also be a copper busbar with a cross-sectional area of ​​3*30mm², thereby increasing the heat dissipation area.

[0058] In some implementations, as shown in Figure 4, a high-voltage box is also provided, including a box body 60 and a high-voltage box control circuit; the main control circuit and control module are set inside the box body 60, and the circuit breaker module is set on one side of the box body 60.

[0059] The enclosure 60 can be made of metal, and its shape can be, but is not limited to, square. The enclosure 60 has a receiving cavity, within which the main control circuit and control module can be housed. The enclosure 60 also has a front panel, on which the circuit breaker module is located, facilitating operation and maintenance. Specific details of the high-voltage box control circuit can be found in the description above and will not be repeated here.

[0060] The front panel may also include high-voltage connectors, circuit breakers, push-button switches, indicator lights, low-voltage communication ports, power interfaces, and diagnostic ports. For example, P- and P+ ports are located on the left side of the front panel, B+ and B- ports are located on the right side, and the first and second circuit breaker modules are located in the middle of the front panel, thus facilitating wiring operations for the high-voltage box.

[0061] In some implementations, the main control circuit and control module are housed within the enclosure 60, while the circuit breaker module is located on one side of the enclosure 60. The main control circuit connects the battery pack and the external power system; the circuit breaker module is located within the main control circuit and is configured to disconnect or close the main control circuit; the control module connects the circuit breaker module and the main control circuit, and is configured to control the on / off state of the circuit breaker module based on the signals acquired by the main control circuit, thereby achieving circuit on / off control. This improves circuit safety without reducing the performance of the high-voltage box, protecting the power supply line. When the power supply line experiences severe overload, short circuit, or undervoltage faults, the circuit breaker module automatically disconnects the circuit to prevent the accident from escalating, ensuring safe circuit operation, reducing the number of fault points in the high-voltage box, and lowering the failure rate of the high-voltage box.

[0062] In some implementations, the enclosure is composed of at least two enclosure panels connected together, with a seal provided between the two connected enclosure panels.

[0063] For example, the enclosure may include a lower enclosure panel and an upper enclosure panel. The lower enclosure panel is welded together from a front panel and a sheet metal bending part. The upper enclosure panel may be a sheet metal bending part. The upper enclosure panel and the lower enclosure panel are connected by bolts.

[0064] The connection between the upper and lower enclosure panels is bent inwards, and a seal is installed at the connection point to improve the enclosure's airtightness and achieve dust and water resistance for the high-voltage box. It should be noted that the indicator lights, circuit breaker module, high-voltage connector, and corresponding ports on the front panel are equipped with sealing gaskets, further enhancing the enclosure's airtightness.

[0065] In some implementations, an energy storage system, including a high-voltage box, is also provided.

[0066] The specific contents of the high-voltage box can be found in the description of the high-voltage box above, and will not be repeated here.

[0067] For example, an energy storage system may include several battery clusters, each of which may include a battery pack and a high-voltage box. The battery packs are connected to the corresponding high-voltage boxes, which have a high-voltage box control circuit. The high-voltage box control circuit includes a main control circuit, a circuit breaker module, and a control module. The main control circuit is configured to connect the battery packs to an external power system. The circuit breaker module is located in the main control circuit and is configured to disconnect or close the main control circuit. The control module is connected to the circuit breaker module and the main control circuit. The control module is configured to control the on / off state of the circuit breaker module based on the acquired signals from the main control circuit, thereby achieving on / off control of the circuit. This improves the safety of the circuit without reducing the performance of the high-voltage box. This application protects the power line by disconnecting or connecting the main control circuit through the circuit breaker module. When the power line experiences a serious overload, short circuit, or undervoltage fault, the circuit breaker module will automatically disconnect the circuit to prevent the accident from escalating, ensure the safe operation of the circuit, reduce the number of fault points in the high-voltage box, lower the failure rate of the high-voltage box, and thus improve the safety of the energy storage system.

[0068] It should be noted that the energy storage system may also include components such as energy storage containers. A specific energy storage system may include more components than those described in the embodiments, or combine certain components, or have different component arrangements.

Claims

1. A high-voltage box control circuit, comprising: The main control circuit is configured to connect the battery pack and an external power system. A circuit breaker module is disposed in the main control circuit and is configured to disconnect or close the main control circuit; A control module is provided, which is connected to the circuit breaker module and the main control circuit. The control module is configured to control the on / off state of the circuit breaker module based on the acquired signal from the main control circuit.

2. The high-voltage box control circuit according to claim 1, wherein, The main control circuit includes a main positive circuit and a main negative circuit; the circuit breaking module includes a first circuit breaking module and a second circuit breaking module. The first circuit breaker module is disposed in the main positive circuit and is configured to cut off or close the main positive circuit; the second circuit breaker module is disposed in the main negative circuit and is configured to cut off or close the main negative circuit. The control module is connected to the first circuit breaker module, the second circuit breaker module, the main positive circuit, and the main negative circuit.

3. The high-voltage box control circuit according to claim 2, wherein, The main positive circuit includes a first positive port, a second positive port, a first fuse, and an electrical signal sensor; The first end of the first fuse is connected to the first positive terminal, the second end of the first fuse is connected to the first circuit breaker module, the first circuit breaker module is connected to the first end of the electrical signal sensor, and the second end of the electrical signal sensor is connected to the second positive terminal.

4. The high-voltage box control circuit according to claim 2, wherein, The main negative circuit includes a first negative terminal, a second negative terminal, a second fuse, and a shunt. The first end of the shunt is connected to the first negative terminal port, the second end of the shunt is connected to the first end of the second fuse, the second end of the fuse is connected to the second circuit breaker module, and the second circuit breaker module is connected to the second negative terminal port.

5. The high-voltage box control circuit according to claim 3, wherein, The first circuit breaker module includes a first circuit breaker switch and a first electric operating mechanism; The first selection terminal of the first circuit breaker is connected to the second terminal of the first fuse, and the second selection terminal of the first circuit breaker is connected to the first terminal of the electrical signal sensor. The first end of the first electric operating mechanism is connected to the first control terminal of the first circuit breaker, the second end of the first electric operating mechanism is connected to the control module, and the third end of the first electric operating mechanism is configured to be connected to the power supply.

6. The high-voltage box control circuit according to claim 5, wherein the first circuit breaker module further includes a first shunt trip unit; The first terminal of the first shunt trip unit is connected to the second control terminal of the first circuit breaker, the second terminal of the first shunt trip unit is connected to the control module, and the third terminal of the first shunt trip unit is configured to be connected to the power supply.

7. The high-voltage box control circuit according to claim 4, wherein, The second circuit breaker module includes a second circuit breaker switch and a second electric operating mechanism; The first selection terminal of the second circuit breaker is connected to the second terminal of the second fuse, and the second selection terminal of the second circuit breaker is connected to the second negative terminal. The first end of the second electric operating mechanism is connected to the first control terminal of the second circuit breaker, the second end of the second electric operating mechanism is connected to the control module, and the third end of the second electric operating mechanism is configured to be connected to the power supply.

8. The high-voltage box control circuit according to claim 7, wherein the second circuit breaker module further includes a second shunt trip unit; The first end of the second shunt trip unit is connected to the second control terminal of the second circuit breaker, the second end of the second shunt trip unit is connected to the control module, and the third end of the second shunt trip unit is configured to be connected to the power supply.

9. The high-voltage box control circuit according to claim 3, wherein the main positive circuit further includes a balancing branch; The first end of the equalization branch is connected to the second end of the first fuse, and the second end of the equalization branch is connected to the first end of the electrical signal sensor.

10. The high-voltage box control circuit according to claim 9, wherein, The equalization branch includes a first relay and a first resistor; The first terminal of the first relay is connected to the second terminal of the first fuse, the second terminal of the first relay is connected to the first terminal of the first resistor, and the second terminal of the first resistor is connected to the first terminal of the electrical signal sensor.

11. The high-voltage box control circuit according to any one of claims 1 to 10, characterized in that, The control module includes a voltage acquisition port, a circuit breaker control port, and an indicator light control port; The voltage acquisition port is connected to the main control circuit, the circuit breaker control port is connected to the circuit breaker module, and the indicator light control port is configured to connect to the indicator light group.

12. A high-voltage box, comprising a box body and a high-voltage box control circuit as described in any one of claims 1 to 11; a main control circuit and a control module are disposed within the box body, and a circuit breaker module is disposed on one side of the box body.

13. The high-pressure box according to claim 12, wherein, The enclosure is composed of at least two enclosure panels connected together, and a sealing element is provided between the two connected enclosure panels.

14. An energy storage system comprising a high-voltage box as described in claim 12 or 13.

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