Household energy storage battery management system and control method thereof

Abstract

The invention discloses a household energy storage battery management system and a control method thereof, and belongs to the technical field of energy storage, and the system comprises a target slave control board which is used for detecting the voltage and temperature of each single battery in a target battery pack in the household energy storage battery management system, and detecting the state of the target slave control board, obtaining detection data of the target slave control board; the target main control board is provided with a low-voltage board and a high-voltage board and is used for performing functional response on the low-voltage household energy storage battery management system according to the state detection data of the target battery pack and the detection data of the target slave control board when the system is the low-voltage household energy storage battery management system; and when the system is a high-voltage household energy storage battery management system, performing functional response on the target battery cluster according to the detection data of each slave control board in the target battery cluster and the state detection data of the target battery cluster. The system can solve the technical problem that the hardware architecture of the high-voltage and low-voltage user energy storage battery management system in the prior art is not universal, so that the battery pack design and the production line cannot be shared.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and particularly relates to a household energy storage battery management system and a control method thereof. Background Art

[0002] A household energy storage battery management system, also known as a home energy storage system or a residential energy storage system, is an energy storage system installed in a user's home, and generally includes a battery pack, a BMS (Battery Management System), an EMS (Energy Management System), a PCS (Power Conversion System), and other electrical devices, etc. The household energy storage battery management system can cooperate with new energy power generation devices such as solar panels to store excess power and supply it to the power grid or for household use when needed. This can not only balance the electrical load and improve the stability of the power supply system, but also reduce the power cost.

[0003] Among them, the household energy storage battery management system can be divided into a low-voltage household energy storage battery management system and a high-voltage household energy storage battery management system. The low-voltage household energy storage battery management system is an energy storage solution specifically designed for households, and its battery voltage is usually around 48V. The high-voltage household energy storage battery management system is a high-power energy storage solution provided for households and small commercial users, and its battery voltage is usually between. Currently, the hardware structures of the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system are different and cannot be used interchangeably, which leads to the inability to share the battery pack design and production line of the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system. Currently, there is no relatively effective solution to this technical problem.

[0004] Therefore, how to provide a household energy storage battery management system that can enable the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system to share the same hardware architecture, and further enable the battery pack design and production line of the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system to be shared, is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a household energy storage battery management system and a control method thereof to solve the technical problem that the hardware architectures of the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system in the prior art cannot be used interchangeably, which further leads to the inability to share the battery pack design and production line of the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system. The specific solutions are as follows:

[0006] To solve the above technical problems, the present invention provides a household energy storage battery management system, including:

[0007] A target slave control board for detecting the voltages and temperatures of individual battery cells in a target battery pack in the household energy storage battery management system, and detecting its own state to obtain the detection data of the target slave control board;

[0008] A target master control board provided with a low-voltage board and a high-voltage board, connected to a plurality of the target slave control boards, for triggering the low-voltage board to perform a functional response to the low-voltage household energy storage battery management system according to the state detection data of the target battery pack and the detection data of the target slave control board when the household energy storage battery management system is a low-voltage household energy storage battery management system; when the household energy storage battery management system is a high-voltage household energy storage battery management system, triggering the high-voltage board and the low-voltage board to perform a functional response to the high-voltage household energy storage battery management system according to the detection data of each slave control board in the target battery cluster and the state detection data of the target battery cluster; the target battery pack and the target battery cluster are respectively any one battery pack and battery cluster in the household energy storage battery management system, the target battery cluster includes a plurality of battery packs connected in series, and each battery cluster and battery pack respectively corresponds to a master control board and a slave control board.

[0009] Preferably, when the target slave control board establishes a communication connection with the target master control board through CAN communication, the target slave control board includes:

[0010] A first analog front-end chip for collecting the voltages and temperatures of individual battery cells in the target battery pack;

[0011] A first single-chip microcomputer connected to the first analog front-end chip through an electrical isolation circuit;

[0012] A first communication interface disposed on the first single-chip microcomputer for connecting to contactors of individual battery cells in the target battery pack;

[0013] A second communication interface disposed on the first single-chip microcomputer for outputting the detection data corresponding to the target slave control board's detection of its own state;

[0014] When the target slave control board establishes a communication connection with the target master control board through a daisy chain, the target slave control board includes:

[0015] A second analog front-end chip for collecting the voltages and temperatures of individual battery cells in the target battery pack;

[0016] A third communication interface disposed on the second analog front-end chip is used to connect to contactors of each single battery in the target battery pack;

[0017] A fourth communication interface disposed on the second analog front-end chip is used to output detection data corresponding to the target slave control board when detecting its own state.

[0018] Preferably, an EMC circuit is provided between the high-voltage board and the low-voltage board.

[0019] Preferably, the low-voltage board includes:

[0020] A second single-chip microcomputer;

[0021] A plurality of communication interfaces disposed on the second single-chip microcomputer are used to communicate with the target slave control board and connect to peripheral circuits.

[0022] Preferably, the high-voltage board includes:

[0023] A third analog front-end chip, connected to the second single-chip microcomputer through an electrical isolation circuit, is used to collect state detection data of the target battery cluster.

[0024] To solve the above technical problems, the present invention also provides a control method for a household energy storage battery management system, which is applied to the low-voltage board in the target main control board of a household energy storage battery management system disclosed above, and includes:

[0025] When the household energy storage battery management system is a low-voltage household energy storage battery management system, perform functional responses to the low-voltage household energy storage battery management system according to the state detection data of the target battery pack and the detection data of the target slave control board;

[0026] When the household energy storage battery management system is a high-voltage household energy storage battery management system, determine the state detection data of the target battery cluster by using the high-voltage board, and perform functional responses to the high-voltage household energy storage battery management system according to the detection data of each slave control board in the target battery cluster and the state detection data of the target battery cluster.

[0027] Preferably, the performing functional responses to the low-voltage household energy storage battery management system according to the state detection data of the target battery pack and the detection data of the target slave control board includes:

[0028] Determine the current of the target battery pack according to the state detection data of the target battery pack, and determine other data except the current of the target battery pack in the state detection data of the target battery pack as the electrical detection data of the target battery pack;

[0029] Obtain the voltages and temperatures of each single battery in the target battery pack from the detection data of the target slave control board, and determine the other data in the detection data of the target slave control board except for the voltages and temperatures of each single battery in the target battery pack as the status monitoring data of the target slave control board;

[0030] Determine the operating state of the target battery pack according to the current of the target battery pack and the voltages and temperatures of each single battery in the target battery pack;

[0031] Control the target battery pack according to the operating state of the target battery pack, the electrical detection data of the target battery pack, the status monitoring data of the target slave control board, and the control instruction of the inverter, so as to perform functional response on the low-voltage household energy storage battery management system.

[0032] Preferably, the current of the target battery pack is obtained by a current sensor externally disposed to the low-voltage household energy storage battery management system.

[0033] Preferably, the method for using the high-voltage board to determine the status detection data of the target battery cluster and performing functional response on the high-voltage household energy storage battery management system according to the detection data of each slave control board in the target battery cluster and the status detection data of the target battery cluster includes:

[0034] If there is only one battery cluster in the household energy storage battery management system, use the high-voltage board to determine the status detection data of the target battery cluster;

[0035] Determine the current of the target battery cluster according to the status detection data of the target battery cluster, and determine the other data in the status detection data of the target battery cluster except for the current of the target battery cluster as the electrical detection data of the target battery cluster;

[0036] Obtain the voltages and temperatures of each battery pack in the target battery cluster from the detection data of each slave control board in the target battery cluster, and determine the other data in the detection data of each slave control board in the target battery cluster except for the voltages and temperatures of each battery pack as the status monitoring data of each slave control board in the target battery cluster;

[0037] Determine the operating state of each battery pack in the target battery cluster according to the current of the target battery cluster and the voltages and temperatures of each battery pack in the target battery cluster;

[0038] Control the target battery cluster according to the operating state of each battery pack in the target battery cluster, the electrical detection data of the target battery cluster, the status monitoring data of each slave control board in the target battery cluster, and the control instruction of the inverter, so as to perform response on the high-voltage household energy storage battery management system.

[0039] Preferably, it further includes:

[0040] If there is more than one battery cluster in the high-voltage household energy storage battery management system, data interaction is performed with the low-voltage boards in the main control boards corresponding to other battery clusters except the target battery cluster in the high-voltage household energy storage battery management system, so as to determine the electrical detection data of other battery clusters except the target battery cluster in the high-voltage household energy storage battery management system, the operating states of each battery pack in the battery cluster, and the status monitoring data of each slave control board.

[0041] Control each battery cluster in the high-voltage household energy storage battery management system according to the operating states of all battery packs in each battery cluster in the high-voltage household energy storage battery management system, the electrical detection data of all battery clusters, the status monitoring data of each slave control board in all battery clusters, and the control instructions of the inverter, so as to respond to the high-voltage household energy storage battery management system.

[0042] Beneficial effects: In the household energy storage battery management system provided by the present invention, a target slave control board and a target main control board are provided. Among them, a low-voltage board and a high-voltage board are provided in the target main control board. A battery cluster is provided in the household energy storage battery management system, and multiple mutually connected-in-series battery packs are provided in the battery cluster. The target battery cluster is any one battery cluster in the household energy storage battery management system, and the target battery pack is any one battery pack in the household energy storage battery management system. The target slave control board will detect the voltages and temperatures of each single battery in the target battery pack in the household energy storage battery management system and detect its own status, so as to obtain the detection data of the target slave control board. When the household energy storage battery management system is a low-voltage household energy storage battery management system, the target main control board will perform a functional response to the low-voltage household energy storage battery management system according to the status detection data of the target battery pack and the detection data of the target slave control board. When the household energy storage battery management system is a high-voltage household energy storage battery management system, the target main control board will perform a functional response to the high-voltage household energy storage battery management system according to the detection data of each slave control board in the target battery cluster and the status detection data of the target battery cluster.

[0043] Compared with the prior art, the household energy storage battery management system adopts a design method of a main control board + a slave control board. The combination of the high-voltage board and the low-voltage board in the main control board enables the household energy storage battery management system to implement both the control logic of the low-voltage household energy storage battery management system and the control logic of the high-voltage household energy storage battery management system, so that the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system can share the same hardware architecture, and further enables the battery pack designs and production lines of the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system to be shared.

[0044] Correspondingly, a control method for a household energy storage battery management system provided by the present invention also has the above beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0046] Figure 1 It is a structural diagram of a low-voltage household energy storage battery management system in the prior art;

[0047] Figure 2 It is a topological structure diagram of a low-voltage household energy storage battery management system in the prior art when multiple machines are connected in parallel;

[0048] Figure 3 It is another topological structure diagram of a low-voltage household energy storage battery management system in the prior art when multiple machines are connected in parallel;

[0049] Figure 4 It is a structural diagram of the main control board in a high-voltage household energy storage battery management system in the prior art;

[0050] Figure 5 It is a structural diagram of a slave control board in a high-voltage household energy storage battery management system in the prior art;

[0051] Figure 6 It is another structural diagram of a slave control board in a high-voltage household energy storage battery management system in the prior art;

[0052] Figure 7 It is a structural diagram of a household energy storage battery management system provided by the embodiment of the present invention;

[0053] Figure 8 It is a functional block diagram of a target slave control board provided by the embodiment of the present invention;

[0054] Figure 9 It is another functional block diagram of a target slave control board provided by the embodiment of the present invention;

[0055] Figure 10 It is a functional block diagram of a target main control board provided by the embodiment of the present invention;

[0056] Figure 11 It is a flowchart for low-voltage control of a household energy storage battery management system provided by the embodiment of the present invention;

[0057] Figure 12The structural diagram of a household energy storage battery management system provided by an embodiment of the present invention when it is a low-voltage household energy storage battery management system;

[0058] Figure 13 The flowchart of high-voltage control of a household energy storage battery management system provided by an embodiment of the present invention;

[0059] Figure 14 The structural diagram of a household energy storage battery management system provided by an embodiment of the present invention when it is a high-voltage household energy storage battery management system;

[0060] Figure 15 Another structural diagram of a household energy storage battery management system provided by an embodiment of the present invention when it is a high-voltage household energy storage battery management system. Detailed implementation manners

[0061] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0062] In order to enable those skilled in the art to more clearly understand the implementation principle of the present invention, before describing the household energy storage battery management system of the present invention, the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system in the prior art will be described in detail.

[0063] The low-voltage household energy storage battery management system is a dedicated energy storage solution for households, and its battery voltage is generally around 48V. The low-voltage household energy storage battery management system can help users make more effective use of self-generated electricity and be used as a backup power source when the power grid is out of power. The low-voltage household energy storage battery management system has the advantages of high safety, easy installation, and strong flexibility. Users can choose different capacity combinations according to their own needs. For example, the power of the low-voltage household energy storage battery management system can be set to .

[0064] Currently, the low-voltage household energy storage battery management system usually adopts an integrated design, and electrical components such as a single-chip microcomputer, a sampling chip, a current sensor, a fuse, and a switching tube are integrated on its circuit board. It can monitor parameters such as the voltage, current, and temperature of the battery in the energy storage system in real time, and moreover, it can also implement functions such as overcharge, over-discharge, over-current, over-temperature, and short-circuit protection of the energy storage system.

[0065] Please refer to Figures 1 to 3 , Figure 1It is a structural diagram of a low-voltage household energy storage battery management system in the prior art. Figure 2 It is a topological structure diagram when multiple machines of the low-voltage household energy storage battery management system in the prior art are connected in parallel. Figure 3 It is another topological structure diagram when multiple machines of the low-voltage household energy storage battery management system in the prior art are connected in parallel. In Figure 2 In the shown low-voltage household energy storage battery management system, the host is a fixed terminal. While in Figure 3 In the shown low-voltage household energy storage battery management system, multiple terminals need to compete for the host.

[0066] The high-voltage household energy storage battery management system is an efficient and high-power energy storage solution provided for household and small commercial users. The battery voltage of the high-voltage household energy storage battery management system is usually , compared with the low-voltage household energy storage battery management system, the high-voltage household energy storage battery management system can provide higher power output and more efficient power transmission, and has the advantages of high efficiency, large capacity and modular design. Users can choose different capacity combinations according to their own needs. For example, the power of the high-voltage household energy storage battery management system can be set to .

[0067] The high-voltage household energy storage battery management system usually adopts a master-slave design of a main control board + slave control board. Among them, the slave control board is responsible for collecting data such as the voltage, current and temperature of the battery pack. The main control board is installed in the high-voltage control box, and the high-voltage control box integrates contactors, circuit breakers, current sensors, fuses, pre-charge resistors and temperature sensors, etc. By communicating with the slave control board, the main control board can not only detect the voltage, temperature and other parameters of each single battery in the battery pack, but also detect electrical parameters such as the bus voltage, charge and discharge current of each battery group, and the system's insulation resistance to ground. The main control board can estimate and monitor the operating status of each battery group through battery management algorithms, and realize charge and discharge management, thermal management, insulation detection and fault alarm of each battery group.

[0068] Please refer to Figures 4 to 6 , Figure 4 It is a structural diagram of the main control board in the high-voltage household energy storage battery management system in the prior art. Figure 5 It is a structural diagram of a slave control board in the high-voltage household energy storage battery management system in the prior art. Figure 6 It is another structural diagram of a slave control board in the high-voltage household energy storage battery management system in the prior art. Among them, Figure 5 The shown slave control board communicates with the main control board through CAN (Controller Area Network), while Figure 6 The shown slave control board communicates with the main control board through a daisy chain.

[0069] Since the low-voltage household energy storage battery management system adopts an integrated circuit board design, all electrical components are integrated on a single circuit board. Once a fault or abnormality occurs in the circuit board, the staff can only repair and replace the entire circuit board, resulting in relatively high maintenance costs. Moreover, the circuit board in the low-voltage household energy storage battery management system is limited by the hardware specification parameters and cannot be configured flexibly. There are numerous circuit board models, which are not suitable for large-capacity systems. The high-voltage household energy storage battery management system adopts a master-slave design, which is different from the hardware architecture of the low-voltage household energy storage battery management system, and the two cannot be used interchangeably. As a result, the high-voltage household energy storage battery management system cannot be applied to the low-voltage household energy storage battery management system, and furthermore, the battery pack designs and production lines of the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system cannot be shared either.

[0070] To solve this technical problem, the present invention provides a household energy storage battery management system. By using this household energy storage battery management system, the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system can share the same hardware architecture, and furthermore, the battery pack designs and production lines of the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system can be shared.

[0071] Please refer to Figure 7 , Figure 7 FIG.

[0072] A target slave control board 11, configured to detect the voltages and temperatures of individual cells in a target battery pack in the household energy storage battery management system, and detect its own state to obtain the detection data of the target slave control board;

[0073] A target master control board 12 provided with a low-voltage board 201 and a high-voltage board 202, connected to a plurality of target slave control boards 11, and configured to, when the household energy storage battery management system is a low-voltage household energy storage battery management system, trigger the low-voltage board to perform a functional response to the low-voltage household energy storage battery management system according to the state detection data of the target battery pack and the detection data of the target slave control board; when the household energy storage battery management system is a high-voltage household energy storage battery management system, trigger the low-voltage board and the high-voltage board to perform a functional response to the high-voltage household energy storage battery management system according to the detection data of each slave control board in the target battery cluster and the state detection data of the target battery cluster; the target battery pack and the target battery cluster are respectively any one battery pack and battery cluster in the household energy storage battery management system, the target battery cluster includes a plurality of battery packs connected in series, and one battery cluster and one battery pack respectively correspond to one master control board and one slave control board.

[0074] In the household energy storage battery management system provided in this embodiment, a split design of a main control board + slave control board is adopted. Moreover, a low-voltage board 201 and a high-voltage board 202 are provided in the target main control board 12. Among them, a battery cluster is provided in the household energy storage battery management system, and the battery cluster is composed of a plurality of battery packs connected in series with each other. Moreover, one battery cluster and one battery pack in the household energy storage battery management system respectively correspond to one main control board and one slave control board. The target battery pack and the target battery cluster are respectively any battery pack and battery cluster in the household energy storage battery management system.

[0075] In the household energy storage battery management system, the target slave control board 11 is used to detect the voltage and temperature of each single battery in the target battery pack in the household energy storage battery management system, and detect its own state, so as to obtain the detection data of the target slave control board. After the target slave control board 11 obtains the detection data of the target slave control board, it will report the detection data of the target slave control board to the target main control board 12.

[0076] When the household energy storage battery management system is a low-voltage household energy storage battery management system, it indicates that the user's required power is small, and the battery packs in the household energy storage battery management system do not need to be cascaded into a battery cluster for energy storage. At this time, the target main control board 12 will perform functional responses to the low-voltage household energy storage battery management system according to the state detection data of the target battery pack and the detection data of the target slave control board. Specifically, when the household energy storage battery management system is a low-voltage household energy storage battery management system, it is the low-voltage board 201 in the target main control board 12 that performs functional responses to the low-voltage household energy storage battery management system according to the state detection data of the target battery pack and the detection data of the target slave control board 11.

[0077] When the household energy storage battery management system is a high-voltage household energy storage battery management system, it indicates that the user's required power is large, and the battery packs in the household energy storage battery management system need to be cascaded into a battery cluster for energy storage. At this time, the target main control board 12 will perform functional responses to the high-voltage household energy storage battery management system according to the detection data of each slave control board in the target battery cluster and the state detection data of the target battery cluster. Specifically, when the household energy storage battery management system is a high-voltage household energy storage battery management system, it is the high-voltage board 202 and the low-voltage board 201 in the target main control board 12 that are combined, and perform functional responses to the high-voltage household energy storage battery management system according to the detection data of each slave control board in the target battery cluster and the state detection data of the target battery cluster.

[0078] It should be noted that in this embodiment, the state detection data of the target battery pack includes parameters such as the voltage, current, temperature, and ground insulation resistance of the target battery pack. And the state detection data of the target battery cluster includes parameters such as the voltage, current, temperature, and ground insulation resistance of the target battery cluster.

[0079] In the household energy storage battery management system provided in this embodiment, all devices can adopt a standard hardware design, which can match battery packs of various capacities, thus significantly reducing the types of battery packs in the household energy storage battery management system. Moreover, under this design architecture, the integration degree of the slave control board and the master control board is higher, and the hardware cost of the household energy storage battery management system can be relatively reduced.

[0080] Compared with the prior art, the household energy storage battery management system adopts a design method of a master control board + a slave control board. In the master control board, through the combination of a high-voltage board and a low-voltage board, the household energy storage battery management system can not only implement the control logic of the low-voltage household energy storage battery management system but also implement the control logic of the high-voltage household energy storage battery management system. As a result, the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system can share the same hardware architecture, and further, the battery pack designs and production lines of the low-voltage household energy storage battery management system and the high-voltage household energy storage battery management system can be shared.

[0081] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Please refer to Figure 8 , Figure 8 which is a functional block diagram of a target slave control board provided by an embodiment of the present invention. As a preferred implementation manner, when the target slave control board 11 establishes a communication connection with the target master control board 11 through CAN communication, the target slave control board 11 includes:

[0082] A first analog front-end chip 101, configured to collect the voltages and temperatures of each single battery in the target battery pack;

[0083] A first single-chip microcomputer 102, connected to the first analog front-end chip 101 through an electrical isolation circuit 103;

[0084] A first communication interface 104 disposed on the first single-chip microcomputer 102, configured to be connected to contactors of each single battery in the target battery pack;

[0085] A second communication interface 105 disposed on the first single-chip microcomputer 102, configured to output detection data corresponding to the target slave control board when detecting its own state;

[0086] Please refer to Figure 9 , Figure 9 which is another functional block diagram of a target slave control board provided by an embodiment of the present invention. When the target slave control board 11 establishes a communication connection with the target master control board 12 through a daisy chain, the target slave control board 11 includes:

[0087] A second analog front-end chip 106, configured to collect the voltages and temperatures of each single battery in the target battery pack;

[0088] The third communication interface 107 disposed on the second analog front-end chip 106 is used to connect to contactors of each single battery in the target battery pack;

[0089] The fourth communication interface 108 disposed on the second analog front-end chip 106 is used to output the detection data corresponding to the target slave board's self-status detection.

[0090] In this embodiment, the structure of the target slave board 11 is specifically described. In practical applications, the target slave board 11 usually communicates with the target master board 12 through CAN communication or daisy chain. Therefore, the target slave board 11 generally has two structural forms.

[0091] Specifically, when the target slave board 11 establishes a communication connection with the target master board 12 through CAN communication, a first analog front-end chip 101 and a first microcontroller unit (MCU) 102 are provided in the target slave board 11. Among them, the first analog front-end chip 101 and the first MCU 102 are connected through an electrical isolation circuit 103. The first analog front-end (AFE) chip 101 is used to collect the voltages and temperatures of each single battery in the target battery pack, and the first MCU 102 is used to obtain the acquisition data of the first analog front-end chip 101 and report it to the target master board 12.

[0092] It should be noted that a first communication interface 104 and a second communication interface 105 are provided on the first MCU 102. Among them, the first communication interface 104 is used to connect to contactors of each single battery in the target battery pack. The contactors in the single battery include both the main contactor and the pre-charge contactor. When the first MCU 102 is connected to the contactors of each single battery in the target battery pack through the first communication interface 104, the first MCU 102 can achieve the purpose of controlling the on / off states of each single battery in the target battery pack. And the second communication interface 105 is used to output the detection data corresponding to the target slave board's self-status detection. That is, the detection data corresponding to the target slave board's self-status detection can be obtained through the second communication interface 105 reserved on the first MCU 102.

[0093] When the target slave control board 11 establishes a communication connection with the target master control board 12 through a daisy chain, the target slave control board 11 is the second analog front-end chip 106. Among them, the second analog front-end chip 106 is used to collect the voltage and temperature of each single battery in the target battery pack. And, a third communication interface 107 and a fourth communication interface 108 are provided on the second analog front-end chip 106. The third communication interface 107 is used to connect to the contactors of each single battery in the target battery pack. The contactors in the single battery include both the main contactor and the pre-charge contactor. When the second analog front-end chip 106 is connected to the contactors of each single battery in the target battery pack through the third communication interface 107, the second analog front-end chip 106 can achieve the purpose of controlling the on-off state of each single battery in the target battery pack. The fourth communication interface 108 is used to output the detection data corresponding to the self-state detection of the target slave control board. That is, the detection data corresponding to the self-state detection of the target slave control board can be obtained through the fourth communication interface 108 reserved on the second analog front-end chip 106.

[0094] Obviously, through the technical solution provided in this embodiment, the design structure of the target slave control board can be made more flexible and diverse.

[0095] Based on the above embodiment, this embodiment further explains and optimizes the technical solution. Please refer to Figure 10 , Figure 10 which is a functional block diagram of a target master control board provided by an embodiment of the present invention. As a preferred implementation, an EMC circuit 13 is provided between the high-voltage board 202 and the low-voltage board 201.

[0096] In this embodiment, in order to ensure the safety and reliability of the target master control board during operation, an EMC (Electromagnetic Compatibility) circuit 13 can also be provided between the high-voltage board 202 and the low-voltage board 201. By providing the EMC circuit 13 between the high-voltage board 202 and the low-voltage board 201, not only can the electromagnetic interference between the high-voltage board 202 and the low-voltage board 201 be effectively suppressed, and the malfunction caused by external interference or self-generated electromagnetic noise during the operation of the high-voltage board 202 and the low-voltage board 201 be reduced, but also the EMC circuit 13 can ensure the stable operation of the high-voltage board 202 and the low-voltage board 201 in a complex electromagnetic environment.

[0097] Obviously, through the technical solution provided in this embodiment, the overall reliability of the target master control board in the household energy storage battery management system during operation can be further improved.

[0098] Please continue to refer to Figure 10 , as a preferred implementation, the low-voltage board 201 includes:

[0099] The second single-chip microcomputer 01;

[0100] A plurality of communication interfaces provided on the second single-chip microcomputer 01, used for communicating with the target slave board and connecting to the peripheral circuit.

[0101] In this embodiment, the low-voltage board 201 in the target main control board 12 is specifically described. In the low-voltage board 201, a second single-chip microcomputer 01 is provided, and a plurality of communication interfaces are provided on the second single-chip microcomputer 01. These communication interfaces enable the low-voltage board 201 to communicate with the target main control board and connect to the peripheral circuit. For example: a power supply, an indicator light, and a data storage module are connected to the second single-chip microcomputer 01, etc.

[0102] It should be noted that the communication interfaces provided on the second single-chip microcomputer 01 can be CAN communication interfaces, RS485 communication interfaces, daisy-chain communication interfaces, or DI / DO (Digital Input / Digital Output) interfaces, etc.

[0103] Please continue to refer to Figure 10 , as a preferred embodiment, the high-voltage board 202 includes:

[0104] The third analog front-end chip 02, connected to the second single-chip microcomputer 01 through the electrical isolation circuit 03, for collecting the state detection data of the target battery cluster.

[0105] In the high-voltage board 202 provided in this embodiment, a third analog front-end chip 02 is provided. Among them, the third analog front-end chip 02 is connected to the second single-chip microcomputer 01 through the electrical isolation circuit 03, for collecting the state detection data of the target battery cluster. The state detection data of the target battery cluster includes parameters such as the voltage, current, temperature, and ground insulation resistance of the target battery cluster. It should be noted that in practical applications, the electrical isolation circuit 03 can be a transformer, an optocoupler, or other circuits with electrical isolation performance.

[0106] Obviously, by setting a low-voltage board and a high-voltage board in the target main control board and combining the low-voltage board and the high-voltage board, the target main control board can realize the corresponding functions.

[0107] Correspondingly, the embodiment of the present invention also provides a control method for a household energy storage battery management system, which is applied to the low-voltage board in the target main control board of a household energy storage battery management system disclosed above, including:

[0108] When the household energy storage battery management system is a low-voltage household energy storage battery management system, the function response of the low-voltage household energy storage battery management system is performed according to the status detection data of the target battery pack and the detection data of the target slave control board;

[0109] When the household energy storage battery management system is a high-voltage household energy storage battery management system, the status detection data of the target battery cluster is determined by using the high-voltage board, and the function response of the high-voltage household energy storage battery management system is performed according to the detection data of each slave control board in the target battery cluster and the status detection data of the target battery cluster.

[0110] In this embodiment, a control method for a household energy storage battery management system is provided. This method is specifically described with the low-voltage board in the target main control board in the household energy storage battery management system as the execution body. This method can refer to the content disclosed in the foregoing embodiments and will not be specifically elaborated here.

[0111] Based on the above embodiments, this embodiment further illustrates and optimizes the technical solution. Please refer to Figure 11 , Figure 11 This is a flowchart for low-voltage control of the household energy storage battery management system provided by the embodiment of the present invention. As a preferred implementation manner, the above steps: performing a function response on the low-voltage household energy storage battery management system according to the status detection data of the target battery pack and the detection data of the target slave control board, include:

[0112] Step S101: Determine the current of the target battery pack according to the status detection data of the target battery pack, and determine the other data except the current of the target battery pack in the status detection data of the target battery pack as the electrical detection data of the target battery pack;

[0113] Step S102: Obtain the voltages and temperatures of each single battery in the target battery pack from the detection data of the target slave control board, and determine the other data except the voltages and temperatures of each single battery in the target battery pack in the detection data of the target slave control board as the status monitoring data of the target slave control board;

[0114] Step S103: Determine the operating state of the target battery pack according to the current of the target battery pack and the voltages and temperatures of each single battery in the target battery pack;

[0115] Step S104: Control the target battery pack according to the operating state of the target battery pack, the electrical detection data of the target battery pack, the status monitoring data of the target slave control board, and the control instruction of the inverter, so as to perform a function response on the low-voltage household energy storage battery management system.

[0116] In this embodiment, the control logic of the low-voltage household energy storage battery management system is specifically described. Please refer to Figure 12 ,Figure 12 The figure shows the structure of a household energy storage battery management system provided by an embodiment of the present invention when it is a low-voltage household energy storage battery management system. Figure 12 In the described low-voltage household energy storage battery management system, there is a main control board and multiple slave control boards, and one slave control board corresponds to one battery pack. Any battery pack in the low-voltage household energy storage battery management system is a target battery pack, and the main control board 1 is the target main control board.

[0117] When the household energy storage battery management system is a low-voltage household energy storage battery management system, the low-voltage board in the target main control board first determines the current of the target battery pack according to the status detection data of the target battery pack, and determines the other data in the status detection data of the target battery pack except the current of the target battery pack as the electrical detection data of the target battery pack. Among them, the electrical detection data of the target battery pack includes parameters such as the current, temperature, and ground insulation resistance of the target battery pack.

[0118] It should be noted that in actual operation, the current of the target battery pack is obtained by a current sensor externally placed in the low-voltage household energy storage battery management system. It can be imagined that when the current sensor is externally placed in the low-voltage household energy storage battery management system, it is more convenient for the maintenance and management of the low-voltage household energy storage battery management system.

[0119] Then, the low-voltage board obtains the voltage and temperature of each single cell in the target battery pack from the detection data of the target slave control board, and determines the other data in the detection data of the target slave control board except the voltage and temperature of each single cell in the target battery pack as the status monitoring data of the target slave control board. Among them, the status monitoring data of the target slave control board includes the temperature of the target slave control board, the contactor connection information with each single cell in the target battery pack, and fault information, etc.

[0120] After that, the low-voltage board determines parameters such as the capacity, SOC (State of Charge), and SOH (State of Health) of the target battery pack based on the battery management algorithm, combined with the current of the target battery pack and the voltage and temperature of each single cell in the target battery pack, and determines the operating state of the target battery pack according to the calculated results.

[0121] After the low-voltage board determines the operating state of the target battery pack, the low-voltage board controls the operating state of the target battery pack according to the operating state of the target battery pack, the electrical detection data of the target electrical pack, the status monitoring data of the target slave control board, and the control instructions of the inverter, and completes the corresponding grid connection and disconnection operations, so as to achieve the purpose of functional response to the low-voltage household energy storage battery management system.

[0122] It should be noted that the target main control board can communicate with the inverter through CAN / RS485 (Recommended Standard 485) / LAN (Local Area Network). The low-voltage board in the target main control board communicates with each slave control board in the low-voltage household energy storage battery management system through CAN. When the low-voltage board controls each battery pack in the energy storage system, it mainly controls the operating state of each battery pack by turning on or off the contactors of the single cells in each battery pack.

[0123] Obviously, through the technical solution provided in this embodiment, the purpose of low-voltage control of the low-voltage household energy storage battery management system can be achieved.

[0124] Based on the above embodiment, this embodiment further describes and optimizes the technical solution. As a preferred implementation manner, please refer to Figure 13 , Figure 13 is a flowchart for high-voltage control of the household energy storage battery management system provided by the embodiment of the present invention. The above steps: using the high-voltage board to determine the status detection data of the target battery cluster, and performing functional responses to the high-voltage household energy storage battery management system according to the detection data of each slave control board in the target battery cluster and the status detection data of the target battery cluster, including:

[0125] Step S201: If there is only one battery cluster in the household energy storage battery management system, use the high-voltage board to determine the status detection data of the target battery cluster;

[0126] Step S202: Determine the current of the target battery cluster according to the status detection data of the target battery cluster, and determine the other data except the current of the target battery cluster in the status detection data of the target battery cluster as the electrical detection data of the target battery cluster;

[0127] Step S203: Obtain the voltages and temperatures of each battery pack in the target battery cluster from the detection data of each slave control board in the target battery cluster, and determine the other data except the voltages and temperatures of each battery pack in the detection data of each slave control board in the target battery cluster as the status monitoring data of each slave control board in the target battery cluster;

[0128] Step S204: Determine the operating state of each battery pack in the target battery cluster according to the current of the target battery cluster and the voltages and temperatures of each battery pack in the target battery cluster;

[0129] Step S205: Control the target battery cluster according to the operating state of each battery pack in the target battery cluster, the electrical detection data of the target battery cluster, the status monitoring data of each slave control board in the target battery cluster, and the control instruction of the inverter, so as to respond to the high-voltage household energy storage battery management system.

[0130] In this embodiment, the control logic of the high-voltage household energy storage battery management system is specifically described. Please refer to Figure 14 , Figure 14 FIG. is a structural diagram of a household energy storage battery management system provided by an embodiment of the present invention when it is a high-voltage household energy storage battery management system. In Figure 14 In the described high-voltage household energy storage battery management system, there is only one battery cluster. A plurality of slave control boards are connected in series in the battery cluster, and each slave control board corresponds to a battery pack. In actual application, the master control board is integrated in the PDU (Power Distribution Unit, power distribution unit). Moreover, the positive and negative electrodes of each battery pack in the battery cluster are respectively connected together through the switching tubes K11 and K12. In Figure 14 , the master control board 1 is the target master control board, and the battery cluster 1 is the target battery cluster.

[0131] When the household energy storage battery management system is a high-voltage household energy storage battery management system, if there is only one battery cluster in the household energy storage battery management system, then the low-voltage board in the target master control board will first control the high-voltage board to obtain the state detection data of the target battery cluster. Among them, the state detection data of the target battery cluster includes parameters such as the voltage, current, temperature, and ground insulation resistance of the target battery cluster.

[0132] Secondly, the low-voltage board will determine the current of the target battery cluster according to the state detection data of the target battery cluster, and will determine the other data in the state detection data of the target battery cluster except the current of the target battery cluster as the electrical detection data of the target battery cluster. Among them, the electrical detection data of the target battery cluster includes parameters such as the voltage, temperature, and ground insulation resistance of the target battery cluster.

[0133] Then, the low-voltage board will obtain the voltage and temperature of each battery pack in the target battery cluster from the detection data of each slave control board in the target battery cluster, and will determine the other data in the detection data of each slave control board in the target battery cluster except the voltage and temperature of each battery pack as: the state monitoring data of each slave control board in the target battery cluster. Among them, the state monitoring data of each slave control board in the target battery cluster includes the temperature, fault information of each slave control board in the target battery cluster, and the connection condition of the contactors between the slave control board and each single battery in the battery pack.

[0134] After that, the low-voltage board will determine parameters such as the capacity, SOC, and SOH of each battery pack in the target battery cluster based on the battery management algorithm, combined with the current of the target battery cluster and the voltage and temperature of each battery pack in the target battery cluster, and determine the operating state of each battery pack in the target battery cluster according to the calculated results.

[0135] Finally, the low-voltage board controls the operating state of the target battery cluster based on the operating states of the battery packs in the target battery cluster, the electrical detection data of the target battery cluster, the status monitoring data of the slave control boards in the target battery cluster, and the control instructions of the inverter, so as to achieve the purpose of responding to the high-voltage household energy storage battery management system. When the low-voltage board controls the operating state of the target battery cluster, it mainly controls the operating state of the target battery cluster by turning on or off the contactors of the single cells in each battery pack in the target battery cluster.

[0136] It should be noted that the target main control board can communicate with the inverter through CAN / RS485 / LAN, and the low-voltage board in the target main control board communicates with each slave control board in the low-voltage household energy storage battery management system through CAN.

[0137] As a preferred implementation, the above control method further includes:

[0138] If there is more than one battery cluster in the high-voltage household energy storage battery management system, data interaction is performed with the low-voltage boards in the main control boards corresponding to the other battery clusters except the target battery cluster in the high-voltage household energy storage battery management system to determine the operating states of the battery packs in the other battery clusters except the target battery cluster in the high-voltage household energy storage battery management system;

[0139] Control each battery cluster in the high-voltage household energy storage battery management system according to the operating states of all battery packs in each battery cluster in the high-voltage household energy storage battery management system, the electrical detection data of all battery clusters, the status monitoring data of the slave control boards in all battery clusters, and the control instructions of the inverter, so as to respond to the high-voltage household energy storage battery management system.

[0140] Please refer to Figure 15 , Figure 15 which is a structural diagram of another household energy storage battery management system provided by an embodiment of the present invention when the household energy storage battery management system is a high-voltage household energy storage battery management system. In Figure 15 the described high-voltage household energy storage battery management system, multiple battery clusters are connected in parallel, and multiple slave control boards are connected in series in each battery cluster, and each slave control board corresponds to a battery pack. The positive and negative electrodes of the battery packs in battery cluster 1 are respectively connected together through switch tubes K11 and K12, and the positive and negative electrodes of the battery packs in battery cluster N are respectively connected together through switch tubes KM1 and KM2. Here, we assume that main control board 1 is the target main control board and battery cluster 1 is the target battery cluster.

[0141] When the household energy storage battery management system is a high-voltage household energy storage battery management system, all the main control boards in the high-voltage household energy storage battery management system can communicate with each other, so that the target main control board can know the operating states of each battery pack in the battery clusters connected to the other main control boards except the target main control board in the high-voltage household energy storage battery management system. Moreover, the low-voltage boards on each main control board can be used as the execution entities to control the operating state of the battery clusters in the high-voltage household energy storage battery management system.

[0142] Specifically, when there is more than one battery cluster in the high-voltage household energy storage battery management system, the low-voltage board in the target main control board will first determine the operating states of each battery pack in the target battery cluster, the electrical detection data of the target battery cluster, and the status monitoring data of each slave control board in the target battery cluster according to the foregoing method. At the same time, the low-voltage board in the target main control board will also perform data interaction with the low-voltage boards in the main control boards corresponding to the other battery clusters except the target battery cluster in the high-voltage household energy storage battery management system, and thereby determine the electrical detection data of the other battery clusters except the target battery cluster in the high-voltage household energy storage battery management system, as well as the operating states of each battery pack and the status monitoring data of each slave control board in the battery clusters.

[0143] Then, the low-voltage board in the target main control board will control the operating states of each battery cluster in the high-voltage household energy storage battery management system according to the operating states of all the battery packs in each battery cluster, the electrical detection data of all the battery clusters, the status monitoring data of each slave control board in all the battery clusters, and the control instructions of the inverter, so as to achieve the purpose of responding to the high-voltage household energy storage battery management system.

[0144] It should be noted that when the low-voltage board in the target main control board controls the operating states of each battery cluster in the high-voltage household energy storage battery management system, it mainly controls the operating state of the battery cluster by turning on or off the contactors of the single cells in each battery pack in a certain battery cluster.

[0145] Obviously, through the technical solution provided in this embodiment, the purpose of controlling the high-voltage household energy storage battery management system can be achieved in different application scenarios.

[0146] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0147] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0148] The above has introduced in detail a household energy storage battery management system and its control method provided by the present invention. Specific examples are used in this text to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A household energy storage battery management system, characterized in that: include: The target slave control board is used to detect the voltage and temperature of each single battery in the target battery pack in the household energy storage battery management system, and detect its own state to obtain the detection data of the target slave control board; A target main control board provided with a low-voltage board and a high-voltage board is connected to a plurality of target slave control boards, and is used for, when the household energy storage battery management system is a low-voltage household energy storage battery management system, triggering the low-voltage board to perform a functional response to the low-voltage household energy storage battery management system according to the state detection data of the target battery pack and the detection data of the target slave control board; when the household energy storage battery management system is a high-voltage household energy storage battery management system, triggering the high-voltage board and the low-voltage board to perform a functional response to the high-voltage household energy storage battery management system according to the detection data of each slave control board in the target battery cluster and the state detection data of the target battery cluster; the target battery pack and the target battery cluster are respectively any one battery pack and battery cluster in the household energy storage battery management system, and the target battery cluster includes a plurality of battery packs connected in series, and each battery cluster and battery pack corresponds to a main control board and a slave control board respectively.

2. A household energy storage battery management system according to claim 1, characterized in that: When the target slave control board establishes a communication connection with the target master control board through CAN communication, the target slave control board includes: A first analog front-end chip, used for collecting the voltage and temperature of each single battery in the target battery pack; A first single-chip microcomputer is connected to the first analog front-end chip via an electrical isolation circuit; A first communication interface provided on the first single chip computer, used to connect to the contactor of each single cell in the target battery pack; A second communication interface provided on the first single-chip computer, used for outputting detection data corresponding to the detection of the state of the target slave control board; When the target slave control board establishes a communication connection with the target master control board through a daisy chain, the target slave control board includes: A second analog front-end chip is used to collect the voltage and temperature of each single battery in the target battery pack; A third communication interface provided on the second analog front-end chip, used to connect to the contactor of each single cell in the target battery pack; The fourth communication interface provided on the second analog front-end chip is used to output detection data corresponding to when the target slave control board detects its own state.

3. A household energy storage battery management system according to claim 1, characterized in that: An EMC circuit is arranged between the high voltage board and the low voltage board.

4. A household energy storage battery management system according to claim 1, characterized in that: The low-voltage board comprises: The second single chip microcomputer; A plurality of communication interfaces are arranged on the second single chip microcomputer, and are used for communicating with the target slave control board and connecting to peripheral circuits.

5. A household energy storage battery management system according to claim 4, characterized in that: The high voltage board comprises: The third analog front-end chip is connected to the second single-chip computer via an electrical isolation circuit and is used for collecting status detection data of the target battery cluster.

6. A control method for a household energy storage battery management system, characterized in that: A low voltage board in a target main control board in a household energy storage battery management system according to any one of claims 1 to 5, comprising: When the household energy storage battery management system is a low-voltage household energy storage battery management system, a functional response is performed on the low-voltage household energy storage battery management system according to the state detection data of the target battery pack and the detection data of the target slave control board; When the household energy storage battery management system is a high-voltage household energy storage battery management system, the high-voltage board is used to determine the status detection data of the target battery cluster, and the high-voltage household energy storage battery management system is functionally responded to according to the detection data of each slave control board in the target battery cluster and the status detection data of the target battery cluster.

7. A control method for a household energy storage battery management system according to claim 6, characterized in that: The function response of the low-voltage household energy storage battery management system according to the state detection data of the target battery pack and the detection data of the target slave control board includes: Determining the current of the target battery pack according to the state detection data of the target battery pack, and determining other data in the state detection data of the target battery pack except the current of the target battery pack as the electrical detection data of the target battery pack; Acquire the voltage and temperature of each single battery in the target battery pack from the detection data of the target slave control board, and determine other data except the voltage and temperature of each single battery in the target battery pack from the detection data of the target slave control board as the state monitoring data of the target slave control board; Determining the operating state of the target battery pack according to the current of the target battery pack and the voltage and temperature of each single battery in the target battery pack; The target battery pack is controlled according to the operating status of the target battery pack, the electrical detection data of the target battery pack, the status monitoring data of the target slave control board and the control instructions of the inverter to perform functional response to the low-voltage household energy storage battery management system.

8. The control method of a household energy storage battery management system according to claim 7, characterized in that: The current of the target battery pack is obtained by a current sensor external to the low-voltage household energy storage battery management system.

9. The control method of a household energy storage battery management system according to claim 6, characterized in that: The method of using the high voltage board to determine the state detection data of the target battery cluster and performing a functional response on the high voltage household energy storage battery management system according to the detection data of each slave control board in the target battery cluster and the state detection data of the target battery cluster includes: If there is only one battery cluster in the household energy storage battery management system, the high voltage board is used to determine the state detection data of the target battery cluster; determining the current of the target battery cluster according to the state detection data of the target battery cluster, and determining other data of the state detection data of the target battery cluster except the current of the target battery cluster as the electrical detection data of the target battery cluster; Acquire the voltage and temperature of each battery pack in the target battery cluster from the detection data of each slave control board in the target battery cluster, and determine other data except the voltage and temperature of each battery pack in the detection data of each slave control board in the target battery cluster as the status monitoring data of each slave control board in the target battery cluster; Determining the operating state of each battery pack in the target battery cluster according to the current of the target battery cluster and the voltage and temperature of each battery pack in the target battery cluster; The target battery cluster is controlled according to the operating status of each battery pack in the target battery cluster, the electrical detection data of the target battery cluster, the status monitoring data of each slave control board in the target battery cluster and the control instructions of the inverter to respond to the high-voltage household energy storage battery management system.

10. The control method of a household energy storage battery management system according to claim 6, characterized in that: Also includes: If there is more than one battery cluster in the high-voltage household energy storage battery management system, data is exchanged with the low-voltage board in the main control board corresponding to the other battery clusters in the high-voltage household energy storage battery management system except the target battery cluster, so as to determine the electrical detection data of the other battery clusters in the high-voltage household energy storage battery management system except the target battery cluster, as well as the operating status of each battery pack in the battery cluster and the status monitoring data of each slave control board; According to the operating status of all battery packs in each battery cluster in the high-voltage household energy storage battery management system, the electrical detection data of all battery clusters, the status monitoring data of each slave control board in all battery clusters and the control instructions of the inverter, each battery cluster in the high-voltage household energy storage battery management system is controlled to respond to the high-voltage household energy storage battery management system.

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