High-voltage box circuit of energy storage system

Abstract

The utility model relates to the technical field of energy storage systems, and discloses a high-voltage box circuit of an energy storage system. The circuit comprises a battery control unit, a master control power supply circuit and an energy storage circuit. The battery control unit is responsible for shunt signal sampling, main loop state feedback, main loop and pre-charging loop opening and closing control, alarm, fault, operation and alarm prompting, copper bar temperature real-time monitoring and communication keeping. The master control power supply circuit provides stable working voltage for the battery control unit. And the energy storage circuit realizes storage and release of electric energy. In addition, the circuit has various communication modes such as daisy chain communication, 485 communication and CAN bus communication, and the communication capability and flexibility of the system are improved. The system has the advantages of simple structure, comprehensive functions, reliable performance and the like, is suitable for various energy storage systems, and has a wide application prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage systems and discloses a high-voltage box circuit of an energy storage system. Background Art

[0002] With the continuous development of new energy technologies, energy storage systems have been widely used in fields such as power storage, electric vehicles, and renewable energy generation. As a key component in energy storage systems, high-voltage boxes in energy storage systems undertake important functions such as energy storage, control, protection, and communication. However, traditional high-voltage box circuits in energy storage systems suffer from complex designs, imprecise control, and limited communication capabilities, resulting in low system efficiency, high failure rates, and difficult maintenance. Therefore, it is particularly important to design a high-voltage box circuit for energy storage systems that is simple in structure, comprehensive in functionality, and reliable in performance. Utility Model Content

[0003] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a high-voltage box circuit for an energy storage system to solve the problems of inaccurate control and limited communication capabilities in the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] In a first aspect, the utility model provides a high-voltage box circuit for an energy storage system, the circuit comprising a battery control unit, a main control power supply circuit, and an energy storage circuit;

[0006] The main control power supply circuit is connected to the PWR+ interface and the PWR- interface of the battery control unit;

[0007] The energy storage circuit is connected to the BAT+ interface, BAT- interface, HV_CH1 interface, and HV_CH2 interface of the battery control unit;

[0008] The battery control unit is used for shunt signal sampling, main circuit status feedback, control of the main circuit and pre-charge circuit opening and closing, providing alarm, fault, operation and alarm prompts, implementing alarm trip lock, real-time monitoring of copper busbar temperature and maintaining communication;

[0009] The main control power supply circuit is used to supply the voltage required for operation to the battery control unit;

[0010] The energy storage circuit is used for storing and releasing electric energy.

[0011] Preferably, in a possible implementation manner of the first aspect, the main control power supply circuit includes a power conversion device and a miniature circuit breaker;

[0012] The miniature circuit breaker has four interfaces, which are marked as interface A, interface B, interface C and interface D respectively;

[0013] The +V interface of the power conversion device is connected to the PWR+ interface of the battery control unit, the -V interface of the power conversion device is connected to the PWR- interface of the battery control unit, the L interface of the power conversion device is connected to the miniature circuit breaker interface C, the miniature circuit breaker interface A is connected to the live wire, the N interface of the power conversion device is connected to the miniature circuit breaker interface D, the miniature circuit breaker interface B is connected to the neutral wire, and the G interface of the power conversion device is connected to the ground wire.

[0014] Preferably, in a possible implementation manner of the first aspect, the energy storage circuit includes a main circuit switch, a pre-charge circuit switch, a resistor R, a fuse FU, and a shunt FL;

[0015] The main circuit switch has four interfaces, which are marked as interface E, interface F, interface G and interface H;

[0016] The pre-fill circuit switch has four interfaces, which are marked as interface I, interface J, interface K and interface L;

[0017] The main circuit switch interface G is connected to the positive pole of the power supply, the main circuit switch interface E is connected to the fuse FU, and the other end of the fuse FU is the positive pole of the energy storage end;

[0018] The main circuit switch interface H is connected to the negative pole of the power supply, and the main circuit switch interface F is connected to the shunt FL, and the other end of the shunt FL is the negative pole of the energy storage end;

[0019] The pre-charge circuit switch interface L is connected to the positive pole of the power supply, the pre-charge circuit switch interface J is connected to the resistor R, and the other end of the resistor R is connected to the side of the fuse FU close to the main circuit switch;

[0020] The pre-filling circuit switch interface K is connected to the negative pole of the power supply, and the pre-filling circuit switch interface I is connected to the side of the shunt FL close to the main circuit switch;

[0021] The main circuit switch interface G is connected to the battery control unit HV_CH1 interface; the main circuit switch interface H is connected to the battery control unit HV_CH2 interface;

[0022] The main circuit switch interface E is connected to the BAT+ interface of the battery control unit; the main circuit switch interface F is connected to the BAT- interface of the battery control unit.

[0023] Preferably, in a possible implementation manner of the first aspect, the battery control unit controls the shunt signal sampling through the I- interface and the I+ interface;

[0024] Obtain main circuit status feedback through the PWR- interface and DI04 interface;

[0025] Control the opening and closing of the main circuit through the H_OUT1 interface and the PWR- interface;

[0026] The opening and closing of the pre-charge circuit is controlled through the H_OUT2 interface and the PWR- interface;

[0027] Get alarm feedback through PWR- interface and DI02 interface;

[0028] Obtain fault prompts through the PWR- interface and H_OUT4 interface;

[0029] Get running prompts through the PWR- interface and H_OUT5 interface;

[0030] Get alarm prompts through the PWR- interface and H_OUT7 interface;

[0031] Implement alarm trip lock through PWR- interface and DI01 interface;

[0032] Real-time monitoring of copper busbar temperature through RT3, RT4 and RT- interfaces;

[0033] Fault feedback is obtained through the PWR- interface and H_OUT8 interface.

[0034] Preferably, in a possible implementation manner of the first aspect, the battery control unit performs daisy chain communication through the IP1 interface, the IM1 interface, the IP2 interface and the IM2 interface;

[0035] 485 communication is carried out through the 485A1 interface, 485B1 interface, 485A2 interface and 485B2 interface;

[0036] CAN bus communication is carried out through the CHG_CANH interface and CHG_CANL interface;

[0037] CAN communication debugging is performed through the VE_CANH interface and VE_CANL interface.

[0038] Preferably, in a possible implementation manner of the first aspect, the battery control unit is grounded through an EARTH port.

[0039] The beneficial effects of the present invention are as follows: the main control power supply circuit provides a stable operating voltage for the battery control unit, ensuring the normal operation of the circuit. The energy storage circuit realizes the storage and release of electric energy, thereby improving the energy utilization efficiency of the system. At the same time, the battery control unit has multiple functions such as shunt signal sampling, main circuit status feedback, control of the opening and closing of the main circuit and the pre-charge circuit, and realizes alarm, fault, operation and alarm prompts through multiple interfaces, monitors the copper bus temperature in real time and maintains communication, thereby enhancing the reliability and safety of the system. In addition, the circuit also has multiple communication modes such as daisy chain communication, 485 communication and CAN bus communication, which improves the communication capability and flexibility of the system. In summary, the high-voltage box circuit of the energy storage system of the present invention has the advantages of simple structure, comprehensive functions, reliable performance, etc. It is suitable for various energy storage systems and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 A circuit diagram of a high-voltage box of an energy storage system is provided for this application.

[0042] Reference numerals: 101 - resistor R, 102 - fuse FU, 103 - shunt FL, 201 - pre-charge circuit switch, 202 - main circuit switch, 203 - miniature circuit breaker. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0044] Example 1: Figure 1 As shown, the utility model provides a high-voltage box circuit of an energy storage system, including a battery control unit, a main control power supply circuit, and an energy storage circuit.

[0045] The battery control unit uses the BCU series battery control chip. The main power supply circuit is connected to the PWR+ and PWR- interfaces of the battery control unit; the energy storage circuit is connected to the BAT+, BAT-, HV_CH1, and HV_CH2 interfaces of the battery control unit.

[0046] The battery control unit is used to sample shunt signals, provide main circuit status feedback, control the opening and closing of the main circuit and pre-charge circuit, provide alarm, fault, operation and warning prompts, implement alarm trip lock, monitor copper busbar temperature in real time and maintain communication; the main control power supply circuit is used to supply the battery control unit with the voltage required for operation; the energy storage circuit is used to store and release electrical energy.

[0047] The main control power supply circuit includes a power conversion device and a miniature circuit breaker 203 .

[0048] The miniature circuit breaker 203 has four interfaces, which are marked as interface A, interface B, interface C and interface D respectively.

[0049] The power conversion device converts the input power voltage to the operating voltage required by the battery control unit, ensuring stable operation under various power conditions. Miniature circuit breaker 203 provides a rapid power cutoff function in the main control power supply circuit. In emergency situations, such as a battery control unit failure or when a rapid power outage is required, miniature circuit breaker 203 can quickly cut off power to protect the circuit and personnel.

[0050] The +V interface of the power conversion device is connected to the PWR+ interface of the battery control unit, the -V interface of the power conversion device is connected to the PWR- interface of the battery control unit, the L interface of the power conversion device is connected to the C interface of the miniature circuit breaker 203, the A interface of the miniature circuit breaker 203 is connected to the live wire, the N interface of the power conversion device is connected to the D interface of the miniature circuit breaker 203, the B interface of the miniature circuit breaker 203 is connected to the neutral wire, and the G interface of the power conversion device is connected to the ground wire.

[0051] The energy storage circuit includes a main circuit switch 202 , a pre-charge circuit switch 201 , a resistor R101 , a fuse FU102 , and a shunt FL103 .

[0052] The main circuit switch 202 has four interfaces, which are marked as interface E, interface F, interface G and interface H respectively; the pre-charge circuit switch 201 has four interfaces, which are marked as interface I, interface J, interface K and interface L respectively.

[0053] The main circuit switches 202 control the connection between the positive and negative poles of the energy storage circuit and the power supply, controlling the storage and release of electrical energy. When the energy storage system needs to be charged or discharged, the two switches will close, allowing electrical energy to flow between the power supply and the energy storage device.

[0054] Pre-charge circuit switch 201 is used to pre-charge the system through resistor R101 when the energy storage system is started or reconnected to the power source, preventing damage to circuit components due to sudden high current surges. The pre-charge process reduces the voltage difference between battery clusters and ensures a safe startup of the system.

[0055] Resistor R101 limits the current during pre-charging, protecting the circuit from excessive current. Fuse FU102, located on the positive side of the tank circuit, provides overcurrent protection. When the current exceeds a certain threshold, it blows to protect the circuit. Shunt FL103, located on the negative side of the tank circuit, collects the loop current.

[0056] The interface G of the main circuit switch 202 is connected to the positive pole of the power supply, and the interface E of the main circuit switch 202 is connected to the fuse FU102. The other end of the fuse FU102 is the positive pole of the energy storage end;

[0057] The interface H of the main circuit switch 202 is connected to the negative pole of the power supply, and the interface F of the main circuit switch 202 is connected to the shunt FL103. The other end of the shunt FL103 is the negative pole of the energy storage end;

[0058] The interface L of the pre-charge circuit switch 201 is connected to the positive pole of the power supply, the interface J of the pre-charge circuit switch 201 is connected to the resistor R101, and the other end of the resistor R101 is connected to the side of the fuse FU102 close to the main circuit switch 202;

[0059] The interface K of the pre-filling circuit switch 201 is connected to the negative pole of the power supply, and the interface I of the pre-filling circuit switch 201 is connected to the side of the shunt FL103 close to the main circuit switch 202;

[0060] The interface G of the main circuit switch 202 is connected to the interface HV_CH1 of the battery control unit; the interface H of the main circuit switch 202 is connected to the interface HV_CH2 of the battery control unit.

[0061] The interface E of the main circuit switch 202 is connected to the BAT+ interface of the battery control unit; the interface F of the main circuit switch 202 is connected to the BAT- interface of the battery control unit.

[0062] The battery control unit controls the shunt signal sampling through the I- and I+ interfaces; obtains main circuit status feedback through the PWR- and DI04 interfaces; controls the opening and closing of the main circuit through the H_OUT1 and PWR- interfaces; controls the opening and closing of the pre-charge circuit through the H_OUT2 and PWR- interfaces; obtains alarm feedback through the PWR- and DI02 interfaces; obtains fault prompts through the PWR- and H_OUT4 interfaces; obtains operation prompts through the PWR- and H_OUT5 interfaces; obtains alarm prompts through the PWR- and H_OUT7 interfaces; implements alarm trip lock through the PWR- and DI01 interfaces; monitors the copper busbar temperature in real time through the RT3, RT4, and RT- interfaces; and obtains fault feedback through the PWR- and H_OUT8 interfaces.

[0063] The BCU communicates via the IP1, IM1, IP2, and IM2 interfaces for daisy-chain communication; 485 communication via the 485A1, 485B1, 485A2, and 485B2 interfaces; CAN bus communication via the CHG_CANH and CHG_CANL interfaces; and CAN communication debugging via the VE_CANH and VE_CANL interfaces. The BCU is grounded via the EARTH port.

[0064] In this embodiment, the PWR+ interface and the PWR- interface are used to connect to the main control power supply circuit to provide the voltage required for the battery control unit to operate. PWR+ receives a positive voltage, while PWR- receives a negative voltage or ground voltage.

[0065] The BAT+ and BAT- interfaces connect to the positive and negative terminals of the energy storage circuit and are used to monitor and control the voltage and current of the energy storage circuit. Through these interfaces, the battery control unit can obtain the real-time status of the energy storage circuit and implement corresponding control strategies.

[0066] The HV_CH1 and HV_CH2 interfaces are connected to the main circuit switch 202 of the energy storage circuit to control the opening and closing of the main circuit. Through these two interfaces, the battery control unit can achieve precise control of the charging and discharging process of the energy storage circuit.

[0067] The I- and I+ interfaces are used to control the shunt signal sampling and collect the loop current.

[0068] The DI01 interface is used to implement alarm trip lockout. When a serious system failure or emergency shutdown is required, the battery control unit can use this interface to perform trip lockout operations. The DI02 interface is used to obtain alarm feedback. When a system failure or abnormality occurs, the battery control unit can use this interface to receive alarm signals. The DI04 interface is used to obtain main circuit status feedback, helping the battery control unit understand the current status of the main circuit.

[0069] The H_OUT1 interface controls the opening and closing of the main circuit, enabling charging or discharging of the energy storage circuit. The H_OUT2 interface controls the opening and closing of the pre-charge circuit, thereby balancing the voltage differential between battery clusters. The H_OUT4 interface is used to obtain fault notifications, helping the battery control unit identify and resolve faults. The H_OUT5 interface is used to obtain operating notifications, displaying the current operating status of the energy storage system. The H_OUT7 interface is used to obtain alarm notifications. When the system generates an alarm that may affect safety or performance, the battery control unit can receive the alarm signal through this interface. The H_OUT8 interface is another interface for obtaining fault feedback, providing additional fault information.

[0070] The IP1, IM1, IP2, and IM2 interfaces are used for daisy-chain communication, enabling data exchange and synchronization between battery control units. The 485A1, 485B1, 485A2, and 485B2 interfaces are used for 485 communication, supporting data communication between the battery control unit and other devices. The CHG_CANH and CHG_CANL interfaces are used for CAN bus communication, supporting data exchange between the battery control unit and the charging system. The VE_CANH and VE_CANL interfaces are used for CAN communication debugging, helping engineers test and debug the battery control unit's CAN communication functions.

[0071] The RT3, RT4, and RT- interfaces are used to monitor the copper busbar temperature in real time to ensure the safe operation of the energy storage system. The EARTH port is used for grounding to ensure the safe operation of the battery control unit and prevent static electricity and electromagnetic interference.

[0072] In this embodiment, the power-on process of the high-voltage box circuit of the energy storage system is as follows: after the power-on command is issued, the pre-charge circuit is closed, and when the pressure difference meets the threshold, the main circuit is closed, and then the pre-charge circuit is disconnected.

[0073] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A high-voltage box circuit for an energy storage system, characterized in that: The circuit includes a battery control unit, a main control power supply circuit, and an energy storage circuit; The main control power supply circuit is connected to the PWR+ interface and the PWR- interface of the battery control unit; The energy storage circuit is connected to the BAT+ interface, BAT- interface, HV_CH1 interface, and HV_CH2 interface of the battery control unit; The battery control unit is used for shunt signal sampling, main circuit status feedback, control of the main circuit and pre-charge circuit opening and closing, providing alarm, fault, operation and alarm prompts, implementing alarm trip lock, real-time monitoring of copper busbar temperature and maintaining communication; The main control power supply circuit is used to supply the voltage required for operation to the battery control unit; The energy storage circuit is used for storing and releasing electric energy.

2. The high-voltage box circuit of the energy storage system according to claim 1, characterized in that: The main control power supply circuit includes a power conversion device and a miniature circuit breaker; The miniature circuit breaker has four interfaces, which are marked as interface A, interface B, interface C and interface D respectively; The +V interface of the power conversion device is connected to the PWR+ interface of the battery control unit, the -V interface of the power conversion device is connected to the PWR- interface of the battery control unit, the L interface of the power conversion device is connected to the miniature circuit breaker interface C, the miniature circuit breaker interface A is connected to the live wire, the N interface of the power conversion device is connected to the miniature circuit breaker interface D, the miniature circuit breaker interface B is connected to the neutral wire, and the G interface of the power conversion device is connected to the ground wire.

3. The high-voltage box circuit of the energy storage system according to claim 1, characterized in that: The energy storage circuit includes a main circuit switch, a pre-charge circuit switch, a resistor R, a fuse FU and a shunt FL; The main circuit switch has four interfaces, which are marked as interface E, interface F, interface G and interface H; The pre-fill circuit switch has four interfaces, which are marked as interface I, interface J, interface K and interface L; The main circuit switch interface G is connected to the positive pole of the power supply, the main circuit switch interface E is connected to the fuse FU, and the other end of the fuse FU is the positive pole of the energy storage end; The main circuit switch interface H is connected to the negative pole of the power supply, and the main circuit switch interface F is connected to the shunt FL, and the other end of the shunt FL is the negative pole of the energy storage end; The pre-charge circuit switch interface L is connected to the positive pole of the power supply, the pre-charge circuit switch interface J is connected to the resistor R, and the other end of the resistor R is connected to the side of the fuse FU close to the main circuit switch; The pre-filling circuit switch interface K is connected to the negative pole of the power supply, and the pre-filling circuit switch interface I is connected to the side of the shunt FL close to the main circuit switch; The main circuit switch interface G is connected to the battery control unit HV_CH1 interface; the main circuit switch interface H is connected to the battery control unit HV_CH2 interface; The main circuit switch interface E is connected to the BAT+ interface of the battery control unit; the main circuit switch interface F is connected to the BAT- interface of the battery control unit.

4. The high-voltage box circuit of the energy storage system according to claim 1, characterized in that: The battery control unit controls the shunt signal sampling via the I- interface and the I+ interface; Obtain main circuit status feedback through the PWR- interface and DI04 interface; Control the opening and closing of the main circuit through the H_OUT1 interface and the PWR- interface; The opening and closing of the pre-charge circuit is controlled through the H_OUT2 interface and the PWR- interface; Get alarm feedback through PWR- interface and DI02 interface; Obtain fault prompts through the PWR- interface and H_OUT4 interface; Get running prompts through the PWR- interface and H_OUT5 interface; Get alarm prompts through the PWR- interface and H_OUT7 interface; Implement alarm trip lock through PWR- interface and DI01 interface; Real-time monitoring of copper busbar temperature through RT3, RT4 and RT- interfaces; Fault feedback is obtained through the PWR- interface and H_OUT8 interface.

5. The high-voltage box circuit of the energy storage system according to claim 1, characterized in that: The battery control unit performs daisy chain communication via the IP1 interface, the IM1 interface, the IP2 interface and the IM2 interface; 485 communication is carried out through the 485A1 interface, 485B1 interface, 485A2 interface and 485B2 interface; CAN bus communication is carried out through the CHG_CANH interface and CHG_CANL interface; CAN communication debugging is performed through the VE_CANH interface and VE_CANL interface.

6. The high-voltage box circuit of the energy storage system according to claim 1, characterized in that: The battery control unit is grounded via the EARTH port.

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