Energy storage system

Abstract

The invention provides an energy storage system which comprises a battery management circuit board, a first controller and a power supply module are arranged on the battery management circuit board, the power supply module is electrically connected with the first controller, and the battery management circuit board further comprises a board-to-board connector; the function board comprises a function module, and the function board is electrically connected with the battery management circuit board through a board-to-board connector; wherein the power supply module supplies power to the functional board through the board-to-board connector, and the functional module is in communication connection with the first controller through the board-to-board connector; wherein the battery management circuit board comprises a first side and a second side, the function board is arranged towards the first side of the battery management circuit board, and the function board and the battery management circuit board are arranged in a stacked mode in the direction from the second side of the battery management circuit board to the first side. The function board and the battery management circuit board are stacked up and down, so that the occupation of the system space can be reduced, and the utilization rate of the system space is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage systems, and more particularly, to an energy storage system. Background Art

[0002] In the related art, in different scenarios, the battery energy storage system has requirements for different functions, such as the cell capacity balancing function, the operation data recording and remote query function, etc. These functions need to call the computing power of the processor, so these functions need to be integrated onto a main control board. The additional functions bring additional electrical components, which results in the large volume and high cost of the main control board. However, these functions are not required in all scenarios, and the utilization rate of the system space is low. Summary of the Invention

[0003] The present application aims to at least solve the technical problem in the prior art or related art that the additional functions of the energy storage system lead to low utilization rate of the system space.

[0004] To this end, the present application provides an energy storage system.

[0005] In view of this, the present application provides an energy storage system, including: a battery management circuit board, on which a first controller and a power supply module are provided, the power supply module is electrically connected to the first controller, and the battery management circuit board further includes a board-to-board connector; a function board, the function board includes a function module, and the function board is electrically connected to the battery management circuit board through the board-to-board connector; wherein, the power supply module supplies power to the function board through the board-to-board connector, and the function module is communicatively connected to the first controller through the board-to-board connector; wherein, the battery management circuit board includes a first side and a second side, the function board is disposed facing the first side of the battery management circuit board, and in the direction from the second side to the first side of the battery management circuit board, the function board and the battery management circuit board are stacked.

[0006] By designing an independent function board in the present application, enabling the function board and the battery management circuit board to share the MCU, the cost can be reduced, and a low-cost integrated system solution can be achieved. At the same time, the function board and the battery management circuit board are stacked up and down, which can reduce the occupation of the system space and improve the utilization rate of the system space.

[0007] In some technical solutions of the present application, optionally, the function board includes at least one of a current limiting module circuit board, an active balancing module circuit board, and a monitoring module circuit board.

[0008] By setting different function boards in the present application, an energy storage system with different structures can be quickly formed according to actual needs, improving the versatility and expandability of the energy storage system.

[0009] In some technical solutions of the present application, optionally, the energy storage system further includes: a fixing bracket, the first end of the fixing bracket is connected to the battery management circuit board, the second end of the fixing bracket is connected to the function board, and the function board and the battery management circuit board are stacked through the fixing bracket.

[0010] By setting the fixing bracket to connect the battery management circuit board and the function board, the firmness and reliability of the connection between the battery management circuit board and the function board are improved while meeting the requirement of stacking the battery management circuit board and the function board, so that the vibrations that may occur during transportation, installation, and use can be reliably handled, and the reliability and stability of the energy storage system are improved.

[0011] In some technical solutions of the present application, optionally, the function board includes a current-limiting module circuit board, the function module includes a current-limiting circuit, and the energy storage system further includes: an energy storage battery, the charging input end of the energy storage battery is electrically connected to the current-limiting circuit; an energy storage inverter, the energy storage inverter is electrically connected to the discharge output end of the energy storage battery and the current-limiting circuit; the battery management circuit board further includes a current-limiting detection module, and the current-limiting detection module is used to detect the parameter information of the energy storage battery; wherein, when the parameter information meets the preset conditions, the first controller sends a current-limiting signal to the current-limiting circuit to control the current-limiting circuit to limit the charging current value of the energy storage battery.

[0012] By setting an independent current-limiting module circuit board in the present application, the charging current of the energy storage battery can be limited, and in this way, the battery life of the energy storage battery can be effectively extended.

[0013] In some technical solutions of the present application, the current-limiting circuit includes: a resistor, the first end of the resistor is electrically connected to the energy storage battery; an inductor, the first end of the inductor is electrically connected to the second end of the resistor; a switching tube, the first end of the switching tube is electrically connected to the second end of the inductor, and the second end of the switching tube is electrically connected to the energy storage inverter; a switching drive module, the switching drive module is electrically connected to the control end of the switching tube, and the switching drive module is used to receive the current-limiting signal and control the switching tube to work according to the current-limiting signal to limit the charging current value of the energy storage battery.

[0014] The present application realizes the current-limiting circuit through a BUCK converter, which has good current-limiting effect and low cost, and has good compatibility and reliability.

[0015] In some technical solutions of the present application, optionally, the battery management circuit board further includes a current detection module, and the current detection module is communicatively connected to the first controller and is used to detect the current value of the current-limiting circuit.

[0016] By setting the current detection module to detect whether the current value after current-limiting matches the set target current, the present application realizes the closed-loop control of the current-limiting module circuit board and improves the current-limiting effect.

[0017] In some technical solutions of the present application, optionally, the energy storage system also includes an energy storage battery, which includes multiple battery cells; the function board also includes an active balancing module circuit board, the function module includes a balancing module and a second controller, and the second controller is communicatively connected to the first controller and the balancing module; the battery management circuit board also includes an analog front-end module, which is communicatively connected to the first controller and is used to collect the cell voltage of the battery cell and determine the voltage difference between multiple battery cells; and, when the voltage difference is greater than the voltage difference threshold, the first controller sends a balancing signal to the second controller, so that the second controller controls the balancing module to turn on the active balancing mode.

[0018] The present application actively balances the power of multiple battery cells by setting up an active balancing module circuit board, which can reduce the battery cell voltage difference between different battery cells and improve the energy utilization rate of the energy storage battery.

[0019] In some technical solutions of the present application, optionally, the balancing module includes: a switch matrix, an isolated DC-DC power supply and / or an energy storage device.

[0020] In some technical solutions of the present application, optionally, the active balancing module circuit board also includes: a balancing power supply module, which is electrically connected to the power supply module, the balancing module and the second controller; wherein the power supply module provides electrical energy to the balancing power supply module, and the balancing power supply module is used to supply power to the balancing module and the second controller.

[0021] The present application provides power supply signals of different voltages to the second controller and the balancing module by setting an independent balancing power supply module on the active balancing circuit board.

[0022] In some technical solutions of the present application, optionally, the function board also includes a monitoring module circuit board, and the function module includes a communication interface; the first controller is also used to collect operating information of the energy storage system and send the operating information to the communication interface; the communication interface is used to send the operating information to the target terminal; or, receive the control instructions sent by the target terminal, and send the control instructions to the first controller.

[0023] The present application can realize remote viewing and monitoring of the operation information of the energy storage system and remotely send control instructions to the energy storage system through the monitoring module circuit board, thereby realizing remote control of the energy storage system.

[0024] In some technical solutions of the present application, optionally, the communication interface includes: a Wi-Fi communication interface, a Bluetooth communication interface, an Ethernet communication interface and / or a cellular network communication interface.

[0025] In some technical solutions of the present application, optionally, the monitoring module circuit board further includes: a monitoring power supply module, which is electrically connected to the communication interface of the power supply module; wherein, the power supply module provides electrical energy to the monitoring power supply module, and the monitoring power supply module is used to supply power to the communication interface.

[0026] In this technical solution, a monitoring power supply module is provided on the monitoring module circuit board. After the monitoring module circuit board and the battery management circuit board are connected through a board-to-board connector, the monitoring power supply module is electrically connected to the power supply module. At this time, the power supply module outputs electrical energy to the power supply. After receiving the electrical energy sent by the power supply module, the power supply supplies power to the communication interface through the received electrical energy. Brief Description of the Drawings

[0027] The above and / or additional aspects and advantages of the present application will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1A Shows a schematic structural diagram of an energy storage system according to some embodiments of the present application;

[0029] Figure 1B Shows a schematic structural diagram of an energy storage system according to some embodiments of the present application;

[0030] Figure 2 Shows a structural block diagram of an energy storage system according to some embodiments of the present application;

[0031] Figure 3 Shows a structural block diagram of an energy storage system according to some embodiments of the present application;

[0032] Figure 4 Shows a structural block diagram of the current limiting module circuit board according to some embodiments of the present application.

[0033] Reference Signs:

[0034] 10 Energy storage system, 12 Energy storage battery, 122 Battery cell, 14 Energy storage inverter;

[0035] 102 Battery management circuit board, 1021 First controller, 1022 Power supply module, 1023 Board-to-board connector, 1024 First side, 1025 Second side, 1026 Current limiting detection module, 1027 Current detection module, 1028 Analog front-end module;

[0036] 104 Function board, 1042 Function module;

[0037] 106 Current limiting module circuit board, 1062 Current limiting circuit, 1064 Switch driving module, R Resistor, L Inductor, M Switch tube;

[0038] The circuit board of the 108 active balancing module, the 1082 balancing module, the 1084 second controller, and the 1086 balancing power supply module;

[0039] The circuit board of the 110 monitoring module, the 112 communication interface, the 114 monitoring power supply module, and the 116 fixing bracket. Detailed implementation manners

[0040] In order to more clearly understand the above objects, features, and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0041] Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0042] The following refers to Figures 1A to 4 Describe an energy storage system according to some embodiments of the present application.

[0043] In some embodiments of the present application, an energy storage system is provided. Figure 1A The schematic structural diagram of the energy storage system according to some embodiments of the present application is shown. Figure 2 And Figure 3 The structural block diagram of the energy storage system according to some embodiments of the present application is shown. As Figure 1A , Figure 2 And Figure 3 Shown, the energy storage system 10 includes: a battery management circuit board 102, a first controller 1021 and a power supply module 1022 are arranged on the battery management circuit board 102, the power supply module 1022 is electrically connected to the first controller 1021, and the battery management circuit board 102 further includes a board-to-board connector 1023; a function board 104, the function board 104 includes a function module 1042, and the function board 104 is electrically connected to the battery management circuit board 102 through the board-to-board connector 1023; wherein, the power supply module 1022 supplies power to the function board 104 through the board-to-board connector 1023, and the function module 1042 is communicatively connected to the first controller 1021 through the board-to-board connector 1023; wherein, the battery management circuit board 102 includes a first side 1024 and a second side 1025, the function board 104 is arranged facing the first side 1024 of the battery management circuit board 102, and in the direction from the second side 1025 to the first side 1024 of the battery management circuit board 102, the function board 104 and the battery management circuit board 102 are stacked.

[0044] In this embodiment, the control module of the energy storage system 10 includes a battery management (Battery Management System, BMS) circuit board and a function board 104. Among them, the function board 104 is independently designed and is connected to the battery management circuit board 102 through a board-to-board connector 1023 (Board-to-board Connectors, BTB). Moreover, in order to save space, the function board 104 and the battery management circuit board 102 are installed in a stacked manner, which can reduce the occupation of system space.

[0045] Connecting the battery management circuit board 102 and the function board 104 through the board-to-board connector 1023 can reduce the use of internal wiring harnesses in the system, reduce the cost of wiring harness connection, and improve connection reliability at the same time.

[0046] Exemplarily, as Figure 1A shown, the first side 1024 of the battery management circuit board 102 is the front side, and the second side 1025 of the battery management circuit board 102 is the back side. The board-to-board connector 1023 is arranged on the front side of the battery management circuit board 102, and the function board 104 is also located on the front side of the battery management circuit board 102. The function board 104 and the battery management circuit board 102 are arranged in a stacked manner.

[0047] Exemplarily, the number of function boards 104 can be one or more. Each function board 104 can add one or more additional functions to the energy storage system 10, such as battery charging current limiting function, cell power balance function, operation data collection and remote query function, etc.

[0048] A first controller 1021 is arranged on the battery management circuit board 102. Exemplarily, the first controller 1021 is a micro control unit (Micro Controller Unit, MCU). The function board 104 is communicatively connected to the first controller 1021 through the communication contacts in the board-to-board connector 1023, so that it can share the same MCU with the battery management circuit board 102 to realize its own functions. Therefore, there is no need to set an additional MCU on the function board 104, which can reduce the cost of the function board 104.

[0049] A power supply module 1022 is also arranged on the battery management circuit board 102. The power supply module 1022 can supply power to the function board 104 through the power supply contacts in the board-to-board connector 1023, so that there is no need to connect an additional power supply cable to the function board 104, which can reduce the system wiring harness.

[0050] Exemplarily, the battery management circuit board 102 realizes the charge and discharge management of the energy storage battery 12 through a MOS (Metal Oxide Semiconductor) transistor or a gallium nitride solution. The battery management circuit board 102 can also collect data such as the cell voltage and the temperature of the cell 122 through an Analog Front End (AFE) chip to realize the data collection of the cell 122. The battery management circuit board 102 has three-way CAN (Controller Area Network, a multi-master serial communication bus protocol) communication, which is respectively in parallel communication with the energy storage inverter 14, the power supply pack, and other integrated machine battery systems.

[0051] Exemplarily, the battery management circuit board 102 has a function of heating the cell at low temperature and a function of collecting the charge and discharge current of the cell, and provides a low-voltage safety power interface with independent output for realizing the charging interface between the low-voltage battery and the household low-voltage electrical equipment, and realizing the basic charge and discharge functions of the battery management system.

[0052] In this application, by designing an independent function board 104, sharing the MCU between the function board 104 and the battery management circuit board 102 can reduce costs and realize a low-cost integrated system solution. At the same time, the function board 104 and the battery management circuit board 102 are arranged in an upper and lower stacked manner, which can reduce the occupation of system space and improve the utilization rate of system space.

[0053] In some embodiments of this application, optionally, as Figure 1A shown, the function board 104 includes at least one of a current-limiting module circuit board, an active balancing module circuit board, and a monitoring module circuit board.

[0054] In this embodiment, the number of the function boards 104 can be one or more, and the function board 104 can include one or more of a current-limiting module circuit board 106, an active balancing module circuit board 108, and a monitoring module circuit board 110.

[0055] Among them, the current-limiting module circuit board 106 can limit the charging current of the energy storage battery 12. The active balancing module circuit board 108 can balance the discharge processes of different cells 122, so that the remaining power of different cells 122 approaches balance. The monitoring module circuit board 110 has an Energy Management System (EMS). The energy management system can locally store the operation information of the energy storage system 10 collected.

[0056] By setting different function boards 104 in this application, different structures of the energy storage system 10 can be quickly formed according to actual needs, improving the versatility and expandability of the energy storage system 10.

[0057] In some embodiments of the present application, optionally, Figure 1B The structural schematic diagram of the energy storage system according to some embodiments of the present application is shown, such as Figure 1B As shown, the energy storage system 10 further includes: a fixing bracket 116. The first end of the fixing bracket 116 is connected to the battery management circuit board 102, and the second end of the fixing bracket 116 is connected to the function board 104. The function board 104 and the battery management circuit board 102 are stacked through the fixing bracket 116.

[0058] In the embodiments of the present application, exemplarily, the fixing bracket 116 may be a fixing column, and screw holes are provided at both ends of the fixing column. The battery management circuit board 102 and the function board 104 are connected to the fixing column by screws.

[0059] Exemplarily, the fixing bracket 116 may be arranged on the outer shell of the energy storage system. The battery management circuit board 102 and the function board 104 are respectively connected to the fixing bracket 116 on the outer shell, that is, the battery management circuit board 102 and the function board 104 are stacked through the outer shell.

[0060] Exemplarily, the fixing bracket 116 may also be other independently arranged bracket structures. Exemplarily, the material of the fixing bracket 116 may be engineering plastic, resin, wood, metal or rubber.

[0061] By arranging the fixing bracket 116 to connect the battery management circuit board 102 and the function board 104, the firmness and reliability of the connection between the battery management circuit board 102 and the function board 104 are improved while meeting the requirement of the stacked arrangement of the brackets of the battery management circuit board 102 and the function board 104, so as to be able to reliably cope with the vibrations that may occur during transportation, installation and use, and improve the reliability and stability of the energy storage system.

[0062] In some embodiments of the present application, optionally, Figure 4 The structural block diagram of the current limiting module circuit board 106 according to some embodiments of the present application is shown, such as Figure 1A 、 Figure 2 、 Figure 3 and Figure 4As shown, the function board 104 includes a current-limiting module circuit board 106. The function module 1042 includes a current-limiting circuit 1062. The energy storage system 10 further includes: an energy storage battery 12, the charging input terminal of the energy storage battery 12 is electrically connected to the current-limiting circuit 1062; an energy storage inverter 14, the energy storage inverter 14 is electrically connected to the discharge output terminal of the energy storage battery 12 and the current-limiting circuit 1062; the battery management circuit board 102 further includes a current-limiting detection module 1026, and the current-limiting detection module 1026 is used to detect the parameter information of the energy storage battery 12; wherein, when the parameter information meets the preset conditions, the first controller 1021 sends a current-limiting signal to the current-limiting circuit 1062 to control the current-limiting circuit 1062 to limit the charging current value of the energy storage battery 12.

[0063] In this embodiment, the function board 104 includes a current-limiting module circuit board 106. The current-limiting module circuit board 106 can limit the charging current of the energy storage battery 12. Specifically, the energy storage system 10 further includes an energy storage battery 12 and an energy storage inverter 14. Among them, the number of energy storage batteries 12 can be multiple. The energy storage battery 12 includes one or more battery cells 122. The energy storage battery 12 can store electric energy. Among them, the electric energy stored in the energy storage battery 12 can come from the power grid or power generation equipment such as photovoltaic power generation and wind power generation. The energy storage inverter 14 can convert the DC signal released by the energy storage battery 12 into an AC signal and supply it to the load for use.

[0064] The function module 1042 on the current-limiting module circuit board 106 is a current-limiting circuit 1062. The current-limiting circuit 1062 can limit the charging current of the energy storage battery 12. Exemplarily, the battery management circuit board 102 provides a dry contact point and an IO (Input Output) interface to control the current-limiting module circuit board 106.

[0065] The current-limiting detection module 1026 is arranged on the battery management circuit board 102. The current-limiting detection module 1026 can identify parameter information such as the voltage of the energy storage battery 12 and the capacity of the battery cell 122, and judge whether it is necessary to limit the charging current of the energy storage battery 12 through these parameter information. Exemplarily, when the first controller 1021 determines that the above parameter information meets the preset conditions, such as the battery voltage is higher than the voltage threshold and the current capacity of the battery cell 122 exceeds the charging threshold, the first controller 1021 controls to turn on the current-limiting function and sends a current-limiting signal to the current-limiting circuit 1062.

[0066] After receiving the current-limiting signal, the current-limiting circuit 1062 on the current-limiting module circuit board 106 turns on the current-limiting function and limits the charging current of the energy storage battery 12 according to the target current set by the first controller 1021, so that the actual charging current of the energy storage battery 12 is consistent with the target charging current set by the first controller 1021.

[0067] By providing an independent current-limiting module circuit board 106, the present application can limit the charging current of the energy storage battery 12, thereby effectively extending the battery life of the energy storage battery 12 in this way.

[0068] In some embodiments of the present application, as Figure 4 shown, the current-limiting circuit 1062 includes: a resistor R, the first end of the resistor R is electrically connected to the energy storage battery 12; an inductor L, the first end of the inductor L is electrically connected to the second end of the resistor R; a switching transistor M, the first end of the switching transistor M is electrically connected to the second end of the inductor L, and the second end of the switching transistor M is electrically connected to the energy storage inverter 14; a switching drive module 1064, the switching drive module 1064 is electrically connected to the control end of the switching transistor M, and the switching drive module 1064 is configured to receive a current-limiting signal and control the operation of the switching transistor M according to the current-limiting signal to limit the value of the charging current of the energy storage battery 12.

[0069] In this embodiment, the current-limiting circuit 1062 is specifically a BUCK (step-down conversion circuit) converter. The BUCK converter can limit the current charging the energy storage battery 12. The battery management circuit board 102 collects the cell voltage of the energy storage battery 12, and collects the PCAK total voltage (the total voltage of all single-cell batteries 122 in the battery pack), as well as parameters such as the current charging current of the energy storage battery 12. It is determined whether to limit the contact current according to the above parameters. If the current charging current does not meet the target charging current value set by the battery management circuit board 102, the battery management circuit board 102 controls the BUCK converter to operate to limit the charging current.

[0070] Exemplarily, the current-limiting circuit 1062 includes a resistor R, an inductor L, and a switching transistor M, where the switching transistor M is a MOS switching transistor M. The resistor R, the inductor L, and the switching transistor M are connected in series between the energy storage inverter 14 and the energy storage battery 12. The switching drive module 1064 is specifically a MOS drive circuit board, i.e., a BUCK-IC. The switching drive module 1064 has a current control function and a current monitoring function. Among them, the current control function can achieve current selection. After receiving a current selection signal, the current value of the charging current is controlled by performing PWM (Pulse Width Modulation) control on the MOS transistor. The current monitoring function can collect the current values of the MOS transistor and other peripheral circuits in real time, and execute a current protection function when the current value exceeds a set threshold.

[0071] After receiving the current-limiting signal sent by the first controller 1021, the switching drive module 1064 controls the operation of the switching transistor M to limit the charging current of the energy storage battery 12.

[0072] Exemplarily, as Figure 3 shown, a fuse module may also be provided between the energy storage battery 12, the energy storage inverter 14, and the current limiting circuit 1062. Exemplarily, a 80A current fuse device FUSE1 is provided on the loop between the energy storage battery 12 and the energy storage inverter 14. On the loop of the switching transistor M, the inductor L, and the resistor R, a unidirectional fuse loop is provided, and a diode D1 and a 40A current fuse device FUSE2 are provided on the unidirectional fuse loop.

[0073] In this application, the current limiting circuit 1062 is implemented by a BUCK converter, which has a good current limiting effect, low cost, and good compatibility and reliability.

[0074] In some embodiments of this application, optionally, as Figure 3 shown, the battery management circuit board 102 further includes a current detection module 1027. The current detection module 1027 is communicatively connected to the first controller 1021 and is configured to detect the current value of the current limiting circuit 1062.

[0075] In this embodiment, the current detection module 1027 is provided on the battery management circuit board 102. The current detection module 1027 can collect the charging current limited by the current limiting circuit 1062 and determine whether the current limiting module circuit board 106 operates according to the target current set by the battery management circuit board 102. If the limited charging current does not match the target current, the battery management circuit board 102 further adjusts the operating parameters of the current limiting module circuit board 106, thereby adjusting the current limiting effect.

[0076] In this application, by providing the current detection module 1027 to detect whether the current value after current limiting matches the set target current, a closed-loop control of the current limiting module circuit board 106 is achieved, improving the current limiting effect.

[0077] In some embodiments of this application, optionally, as Figure 3 and Figure 4 shown, the energy storage system 10 further includes an energy storage battery 12, and the energy storage battery 12 includes a plurality of battery cells 122; the function board 104 further includes an active balancing module circuit board 108, the function module 1042 includes a balancing module 1082 and a second controller 1084, and the second controller 1084 is communicatively connected to the first controller 1021 and the balancing module 1082; the battery management circuit board 102 further includes an analog front-end module 1028, and the analog front-end module 1028 is communicatively connected to the first controller 1021 and is configured to collect the battery cell voltages of the battery cells 122 and determine the voltage differences of the plurality of battery cells 122; and, when the voltage difference is greater than the voltage difference threshold, the first controller 1021 sends a balancing signal to the second controller 1084, so that the second controller 1084 controls the balancing module 1082 to turn on the active balancing mode.

[0078] In this embodiment, the energy storage system 10 includes an energy storage battery 12, and the number of energy storage batteries 12 can be multiple. The energy storage battery 12 includes a plurality of battery cells 122. Exemplarily, the number of battery cells 122 is at least two. Since the batches, production environments, and usage states of different battery cells 122 are different, the discharge states of different battery cells 122 may be different. These different states may result in different remaining capacities and different cell voltages among different battery cells 122. Due to the cask effect, when the power of the battery cell with the minimum remaining power is lower than the discharge threshold, the entire energy storage battery 12 will be recognized as out of power, resulting in waste of the remaining electrical energy.

[0079] The battery management circuit board 102 includes an Analog Front End (AFE) module. The analog front end module 1028 can collect the cell voltages of each battery cell 122 to determine the voltage difference between different battery cells 122. At the same time, the analog front end module 1028 also has a passive balancing function. When the voltage difference between the battery cells 122 is large, the passive balancing function is used to reduce the voltage difference between different battery cells 122. However, the passive balancing module 1082 has limited ability to balance the battery cell power. When the degree of imbalance between the battery cells 122 is large, the passive balancing module 1082 will not be able to effectively balance the power of different battery cells, still resulting in waste of electrical energy.

[0080] In response to this, the function board 104 includes an active balancing module circuit board 108. The function module 1042 of the active balancing module circuit board 108 includes a balancing module 1082. The balancing module 1082 can balance the discharge processes of different battery cells 122, so that the remaining powers of different battery cells 122 approach balance. The active balancing module circuit board 108 also includes a second controller 1084, and the second controller 1084 can control the balancing module 1082 to work.

[0081] When the voltage difference between multiple battery cells 122 collected by the analog front end module 1028 exceeds the voltage difference threshold, the active balancing function is enabled. At this time, the first controller 1021 sends an enabling signal to the second controller 1084 and sends the battery cells 122 that need to be balanced to the second controller 1084. After receiving the above enabling signal, the second controller 1084 controls the balancing module 1082 to work.

[0082] Exemplarily, the second controller 1084 will also detect the charging and discharging currents of the battery cells 122 whose balancing is enabled, and based on the detection results, determine whether the balancing module 1082 works according to the set balancing mode, ensuring to work according to the uprightness of the battery management circuit board 102, so as to achieve active balancing of the battery cell power.

[0083] Exemplarily, the battery management circuit board 102 communicates with the active balancing module circuit board 108 through communication means such as UART (Universal Asynchronous Receiver / Transmitter), I2C (Inter-Integrated Circuit, two-wire serial bus), SPI (Serial Peripheral Interface), CAN (Controller Area Network, multi-master serial communication bus protocol), or RS485 (a balanced transmission serial communication protocol).

[0084] By providing the active balancing module circuit board 108 in this application, active balancing of the power levels of multiple battery cells can be performed, which can reduce the voltage difference between different battery cells 122 and improve the energy utilization rate of the energy storage battery 12.

[0085] In some embodiments of this application, optionally, the balancing module 1082 includes: a switch matrix, an isolated DC-DC power supply, and / or an energy storage device.

[0086] In this embodiment, the balancing module 1082 includes a switch matrix. The switch matrix includes a plurality of switching devices, and each switching device is electrically connected to a battery cell 122. During discharging, the switch matrix can actively close the discharging path of the battery cell 122 with a lower power level. During charging, the switch matrix can actively close the charging path of the battery cell 122 with a higher power level. The active balancing function can be achieved through the switch matrix.

[0087] The balancing module 1082 may also include an isolated DC-DC power supply. The second controller 1084 controls the operation of the isolated DC-DC power supply to ensure that it can operate according to the instructions of the battery management circuit board 102.

[0088] The balancing module 1082 further includes an energy storage device. Exemplarily, the energy storage device includes a capacitor.

[0089] In some embodiments of this application, optionally, as Figure 3 shown, the active balancing module circuit board 108 further includes: a balancing power supply module 1086, which is electrically connected to the power supply module 1022, the balancing module 1082, and the second controller 1084; wherein, the power supply module 1022 provides electrical energy to the balancing power supply module 1086, and the balancing power supply module 1086 is used to supply power to the balancing module 1082 and the second controller 1084.

[0090] In this embodiment, an equalization power supply module 1086 is provided on the active equalization module circuit board 108. After the active equalization module circuit board 108 is connected to the battery management circuit board 102 through the board-to-board connector 1023, the equalization power supply module 1086 is electrically connected to the power supply module 1022. At this time, the power supply module 1022 outputs electrical energy to the power supply. After receiving the electrical energy sent by the power supply module 1022, the power supply module 1022 supplies power to the second controller 1084 and the equalization module 1082 through the received electrical energy.

[0091] Exemplarily, the voltages required for the second controller 1084 and the equalization module 1082 to operate are different. Therefore, by setting the equalization power supply module 1086, the received electrical energy can be converted into a first power supply signal suitable for powering the second controller 1084 and a second power supply signal suitable for powering the equalization module 1082.

[0092] In this application, by providing an independent equalization power supply module 1086 on the active equalization circuit board, power supply signals with different voltages can be provided for the second controller 1084 and the equalization module 1082.

[0093] In some embodiments of this application, optionally, as Figure 3 shown, the functional board 104 further includes a monitoring module circuit board 110, and the functional module 1042 includes a communication interface 112; the first controller 1021 is further configured to collect the operation information of the energy storage system 10 and send the operation information to the communication interface 112; the communication interface 112 is configured to send the operation information to the target terminal; or, receive a control instruction sent by the target terminal and send the control instruction to the first controller 1021.

[0094] In this embodiment, the functional board 104 includes a monitoring module circuit board 110, and the monitoring module circuit board 110 has an Energy Management System (EMS). The energy management system can locally store the operation information of the energy storage system 10 collected. The functional module 1042 of the monitoring module circuit board 110 is the communication interface 112. Exemplarily, the communication interface 112 has a wired communication function and a wireless communication function, and through the communication interface 112, communication with a target terminal such as a host computer or a user's mobile phone can be achieved.

[0095] In this application, through the monitoring module circuit board 110, remote viewing and monitoring of the operation information of the energy storage system 10 can be realized, and control instructions can be remotely sent to the energy storage system 10, thereby realizing remote control of the energy storage system 10.

[0096] In some embodiments of the present application, optionally, the communication interface 112 includes: a Wi-Fi communication interface, a Bluetooth communication interface, an Ethernet communication interface, and / or a cellular network communication interface.

[0097] In this embodiment, the communication interface 112 includes wireless communication interfaces such as a Wi-Fi communication interface and / or a Bluetooth communication interface. Exemplarily, the battery management circuit board 102 communicates with the Wi-Fi communication interface and / or the Bluetooth communication interface of the monitoring module circuit board 110 through communication interfaces such as a Serial Peripheral Interface (SPI), a Universal Asynchronous Receiver / Transmitter (UART), or a Controller Area Network (CAN).

[0098] The communication interface 112 may further include an Ethernet communication interface. Exemplarily, the battery management circuit board 102 and the Port Physical Layer (PHY) chip on the monitoring module circuit board 110 implement Ethernet communication through a Reduced Media Independent Interface (RMII) or a Media Independent Interface (MII).

[0099] The communication interface 112 may further include a cellular network communication interface. Exemplarily, the cellular network communication interface includes 2G, 3G, 4G, or 5G cellular network communication.

[0100] In some embodiments of the present application, optionally, as Figure 3 shown, the monitoring module circuit board 110 further includes: a monitoring power supply module 114, and the monitoring power supply module 114 is electrically connected to the power supply module 1022; wherein, the power supply module 1022 supplies electrical energy to the monitoring power supply module 114, and the monitoring power supply module 114 is used to supply power to the communication interface 112.

[0101] In this embodiment, a monitoring power supply module 114 is provided on the monitoring module circuit board 110. After the monitoring module circuit board 110 and the battery management circuit board 102 are connected through a board-to-board connector 1023, the monitoring power supply module 114 is electrically connected to the power supply module 1022. At this time, the power supply module 1022 outputs electrical energy to the power supply. After receiving the electrical energy sent by the power supply module 1022, the power supply module 1022 supplies power to the communication interface 112 through the received electrical energy.

[0102] In the description of the present application, the term "a plurality of" refers to two or more. Unless otherwise clearly defined, the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application. The terms "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0103] In the description of the present application, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the schematic expressions of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0104] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An energy storage system, characterized in that, Comprising: A battery management circuit board, on which a first controller and a power supply module are arranged. The power supply module is electrically connected to the first controller, and the battery management circuit board further includes a board-to-board connector; A function board, which includes a function module. The function board is electrically connected to the battery management circuit board through the board-to-board connector; wherein, the power supply module supplies power to the function board through the board-to-board connector, and the function module is communicatively connected to the first controller through the board-to-board connector; Wherein, the battery management circuit board includes a first side and a second side. The function board is arranged facing the first side of the battery management circuit board, and in the direction from the second side to the first side of the battery management circuit board, the function board and the battery management circuit board are stacked.

2. The energy storage system according to claim 1, wherein The function board includes at least one of a current-limiting module circuit board, an active balancing module circuit board, and a monitoring module circuit board.

3. The energy storage system according to claim 1, wherein, Further comprising: A fixing bracket, the first end of which is connected to the battery management circuit board, and the second end of which is connected to the function board. The function board and the battery management circuit board are stacked through the fixing bracket.

4. The energy storage system according to claim 1, wherein The function board includes a current-limiting module circuit board, the function module includes a current-limiting circuit, and the energy storage system further includes: An energy storage battery, the charging input end of which is electrically connected to the current-limiting circuit; An energy storage inverter, which is electrically connected to the discharge output end of the energy storage battery and the current-limiting circuit; The battery management circuit board further includes a current-limiting detection module, which is used to detect the parameter information of the energy storage battery; wherein, when the parameter information meets the preset conditions, the first controller sends a current-limiting signal to the current-limiting circuit to control the current-limiting circuit to limit the charging current value of the energy storage battery.

5. The energy storage system according to claim 4, wherein The current-limiting circuit includes: A resistor, the first end of which is electrically connected to the energy storage battery; An inductor, the first end of which is electrically connected to the second end of the resistor; A switching tube, the first end of which is electrically connected to the second end of the inductor, and the second end of which is electrically connected to the energy storage inverter; A switching drive module, which is electrically connected to the control end of the switching tube and is used to receive the current-limiting signal and control the switching tube to work according to the current-limiting signal to limit the charging current value of the energy storage battery.

6. The energy storage system according to claim 4, characterized in that The battery management circuit board further includes a current detection module, which is communicatively connected to the first controller and is used to detect the current value of the current-limiting circuit.

7. The energy storage system according to claim 1, characterized in that, The energy storage system further includes an energy storage battery, and the energy storage battery includes a plurality of battery cells; The function board further includes an active balancing module circuit board, the function module includes a balancing module and a second controller, and the second controller is communicatively connected to the first controller and the balancing module; The battery management circuit board further includes an analog front-end module, which is communicatively connected to the first controller and is configured to collect the cell voltages of the battery cells and determine the voltage differences between multiple battery cells; and, when the voltage difference is greater than the voltage difference threshold, the first controller sends an equalization signal to the second controller so that the second controller controls the equalization module to turn on the active equalization mode.

8. The energy storage system according to claim 7, wherein The equalization module includes: a switch matrix, an isolated DC-DC power supply, and / or an energy storage device.

9. The energy storage system according to claim 7, wherein The active equalization module circuit board further includes: an equalization power supply module, which is electrically connected to the power supply module, the equalization module, and the second controller; wherein, the power supply module supplies electrical energy to the equalization power supply module, and the equalization power supply module is configured to supply power to the equalization module and the second controller.

10. The energy storage system according to any one of claims 1 to 9, characterized in that The functional board further includes a monitoring module circuit board, and the functional module includes a communication interface; The first controller is further configured to collect the operation information of the energy storage system and send the operation information to the communication interface; The communication interface is configured to send the operation information to a target terminal; or, receive a control instruction sent by the target terminal and send the control instruction to the first controller.

11. The energy storage system according to claim 10, wherein, The communication interface includes: a Wi-Fi communication interface, a Bluetooth communication interface, an Ethernet communication interface, and / or a cellular network communication interface.

12. The energy storage system according to claim 10, wherein The functional module further includes: a monitoring power supply module, which is electrically connected to the power supply module; wherein, the power supply module supplies electrical energy to the monitoring power supply module, and the monitoring power supply module is configured to supply power to the communication interface.

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