Battery management system, energy storage system and battery device

Abstract

The utility model discloses a battery management system, an energy storage system and a battery device, and belongs to the technical field of battery management, the battery management system is connected with at least one battery pack, and the battery pack comprises n battery modules and a switch assembly; the battery management system comprises a battery management unit and at least one monitoring module. Each monitoring module comprises n battery monitoring units and a driving sampling unit, and the n battery monitoring units and the driving sampling units are sequentially connected in series in a daisy chain cascade manner and are in communication connection with the battery management unit; each battery monitoring unit detects characteristic parameters of each battery module; the driving sampling unit detects the temperature parameter of the battery pack and the state of the switch assembly, and drives the switch assembly according to the control instruction; the battery management unit outputs the control instruction according to the characteristic parameters of each battery module, the temperature parameters of the battery pack and the state of the switch assembly, or is used for outputting the control instruction according to the input instruction; the hardware design is simplified, and the hardware cost is saved.

Description

Technical Field

[0001] This application belongs to the field of battery management technology, and in particular relates to a battery management system, energy storage system, and battery device. Background Technology

[0002] The relevant battery management system has a three-layer architecture, including a main battery management unit, slave battery management units, and multiple battery monitoring units. The main battery management unit and slave battery management units communicate via a controller area network (CAN) bus, while the slave battery management units and multiple battery monitoring units communicate via a daisy chain.

[0003] However, this architecture includes a battery management unit containing power supply, isolated power supply, isolated communication, control circuit, detection circuit, low-voltage sampling circuit, and high-voltage sampling circuit. At the same time, the control circuit must be equipped with a microprocessor that meets functional safety requirements, resulting in complex hardware design and high hardware cost.

[0004] Therefore, the related battery management system has a complex hardware design and high hardware cost. Utility Model Content

[0005] In view of the above problems, this application provides a battery management system, an energy storage system, and a battery device, aiming to solve the problems of complex hardware design and high hardware cost of related battery management systems.

[0006] In a first aspect, this application provides a battery management system that is connected to at least one battery pack, wherein the battery pack includes n battery modules and a switching component, where n is a positive integer; the battery management system includes a battery management unit and at least one monitoring module.

[0007] Each monitoring module includes n battery monitoring units and drive sampling units, and the n battery monitoring units and drive sampling units are connected in series and communicate with the battery management unit in a daisy chain cascade manner.

[0008] Each of the n battery monitoring units is connected to one of the n battery modules;

[0009] Each battery monitoring unit is used to detect the characteristic parameters of each of the battery modules;

[0010] The driving sampling unit is used to detect the temperature parameters of the battery pack and the state of the switching component, and to drive the switching component according to the control command;

[0011] The battery management unit is used to output the control command based on the characteristic parameters of each battery module, the temperature parameters of the battery pack, and the status of the switching component.

[0012] In the technical solution of this application embodiment, n battery monitoring units and drive sampling units are sequentially connected in series to the battery management unit in a daisy-chain cascade manner, eliminating the need for CAN communication connections and simplifying the hardware design of the battery management system. Simultaneously, the drive sampling unit detects the temperature parameters of the battery pack and the status of the switching components, and drives the switching components according to control commands. The battery management unit outputs control commands based on the characteristic parameters of each battery module, the temperature parameters of the battery pack, and the status of the switching components. That is, all algorithms are completed by the battery management unit, and the drive sampling unit completes the sampling and driving functions of the slave battery management unit in the relevant solution, eliminating the need for a separate slave battery management unit containing a microprocessor. Therefore, the hardware design of the battery management system is further simplified, and hardware costs are reduced.

[0013] In some embodiments, each of the monitoring modules further includes a detection unit, and the n battery monitoring units, the detection unit, and the drive sampling unit are connected in series and communicate with the battery management unit in a daisy-chain cascade manner.

[0014] The detection unit is used to detect the electrical parameters of the battery pack;

[0015] The battery management unit is specifically used to output the control command based on the electrical parameters of the battery pack, the characteristic parameters of each battery module, the temperature parameters of the battery pack, and the status of the switching component.

[0016] By adopting the above scheme, the electrical parameters of the battery pack can be detected, thereby improving the safety and reliability of the battery management system.

[0017] In some embodiments, the detection unit includes:

[0018] A high-voltage sampling circuit, connected to the battery pack, is used to sample the voltage of the battery pack to output a voltage sampling signal;

[0019] A current sampling circuit, connected to the battery pack, is used to sample the current flowing through the battery pack to output a current sampling signal;

[0020] An insulation sampling circuit, connected to the battery pack, is used to detect the insulation status of the battery pack and output an insulation detection signal;

[0021] The first battery pack monitor is connected to the high-voltage sampling circuit, the current sampling circuit, and the insulation sampling circuit, and is connected in series to the daisy chain for communication. It is used to output the electrical parameters of the battery pack based on the voltage sampling signal, the current sampling signal, and the insulation detection signal.

[0022] The detection circuit has a simple structure and low cost.

[0023] In some embodiments, the battery management unit includes at least one communication module and a microprocessor;

[0024] The communication module is used to convert the first daisy-chain signal into a first serial communication signal, and to convert the second serial communication signal into a second daisy-chain signal;

[0025] A microprocessor, connected to at least one of the communication modules, is configured to output the second serial communication signal based on the first serial communication signal;

[0026] Both the first daisy-chain signal and the first serial communication signal carry characteristic parameters of each battery module, temperature parameters of the battery pack, and the state of the switching component. Both the second serial communication signal and the second daisy-chain signal carry control commands.

[0027] By adopting the above scheme, a daisy-chain communication connection for the battery management unit was achieved, simplifying the hardware design of the battery management system.

[0028] In some embodiments, the driving sampling unit includes:

[0029] The second battery pack monitor is used to output a third serial communication signal according to the control command, and to output the temperature parameters of the battery pack and the status of the switching assembly according to the temperature detection signal and the return detection signal.

[0030] A temperature detection circuit is used to detect the temperature of the battery pack and output a temperature detection signal.

[0031] A driving circuit is used to output multiple driving signals according to the third serial communication signal to drive the switching assembly;

[0032] The feedback circuit is used to detect multiple drive signals and multiple current signals flowing through the switching assembly, so as to output the feedback signal.

[0033] By adopting the above scheme, without configuring a microprocessor, the switching components and peripheral components (such as indicator components) are driven according to control instructions. The temperature parameters of the battery pack and the status of the switching components are detected, and the detection results are reported to the battery management unit through daisy-chain communication. This simplifies the hardware design of the driving sampling unit and reduces hardware costs.

[0034] In some embodiments, the driving circuit includes:

[0035] A decoding circuit is used to convert the third serial communication signal into a data signal and a first selection signal;

[0036] The output circuit is used to select its own output port based on the first selection signal, and output a drive signal from the output port according to the data signal.

[0037] By adopting the above scheme, since the first selection signal selects multiple of its own output ports, and the selection signal and data signal are generated by conversion of the third serial communication signal, the port resources of the second battery pack monitor are saved.

[0038] In some embodiments, the back-detection circuit includes:

[0039] An analog switch circuit is used to sequentially select and output various drive signals and various current signals flowing through the switch component according to a second selection signal, so as to output a feedback signal.

[0040] The second battery pack monitor is specifically used to output the second selection signal, output a third serial communication signal according to the control command, and output the temperature parameters of the battery pack and the status of the switching assembly according to the temperature detection signal and the return signal.

[0041] The above technical solution allows for the sequential selection of output drive signals and current signals flowing through the switching assembly to the second battery pack monitor based on the second selection signal, thus saving port resources of the second battery pack monitor.

[0042] In some embodiments, the driving sampling unit further includes:

[0043] A power supply circuit is used to receive the input voltage and convert the input voltage into a power supply voltage to power the various functional modules in the driving sampling unit.

[0044] The power supply sampling circuit is used to sample the power supply voltage and output a power supply sampling signal.

[0045] The second battery pack monitor is specifically used to output a third serial communication signal according to the control command, and to output power supply voltage information, temperature parameters of the battery pack and status of the switching assembly according to the power supply sampling signal, the temperature detection signal and the feedback signal.

[0046] The above technical solution can sample the power supply voltage and report the power supply voltage information to the power management unit via daisy-chain communication, thereby improving the safety and reliability of the battery management system.

[0047] In some embodiments, the driving sampling unit further includes:

[0048] A dry contact detection circuit detects the state of the switching assembly and outputs a dry contact detection signal.

[0049] The second battery pack monitor is specifically used to output a third serial communication signal according to the control command, and to output power supply voltage information, temperature parameters of the battery pack and status of the switching assembly according to the dry contact detection signal, the temperature detection signal and the return detection signal.

[0050] The above technical solution can detect the status of the switching component and report the status of the switching component to the power management unit through daisy-chain communication, thereby improving the safety and reliability of the battery management system.

[0051] In some embodiments, the driving sampling unit further includes:

[0052] Hall effect sensor circuit is used to detect the current of the battery pack and output a current detection signal;

[0053] The second battery pack monitor is specifically used to output a third serial communication signal according to the control command, and to output the current parameters of the battery pack, the temperature parameters of the battery pack, and the status of the switching assembly according to the current detection signal, the temperature detection signal, and the feedback signal.

[0054] The above technical solution can detect the current of the battery pack and report the current parameters of the battery pack to the power management unit through daisy-chain communication, thereby improving the safety and reliability of the battery management system.

[0055] Secondly, this utility model embodiment also provides an energy storage system, which includes the battery management system described above.

[0056] Thirdly, this utility model embodiment also provides a battery device, which includes the battery management system described above.

[0057] By adopting the above solutions, since the energy storage system includes the battery management system of any of the above solutions, the hardware design of the energy storage system can be simplified and hardware costs can be saved.

[0058] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0059] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0060] Figure 1 This is a schematic diagram of a battery management system provided in an embodiment of this application;

[0061] Figure 2 This is a schematic diagram of another structure of the battery management system provided in one embodiment of this application;

[0062] Figure 3 A schematic diagram of a detection unit in a battery management system provided in an embodiment of this application;

[0063] Figure 4 A schematic diagram of a battery management unit in a battery management system provided in an embodiment of this application;

[0064] Figure 5 This is a schematic diagram of a drive sampling unit in a battery management system provided in an embodiment of this application;

[0065] Figure 6 This is a schematic diagram of another structure of the drive circuit in the battery management system provided in one embodiment of this application;

[0066] Figure 7 This is a schematic diagram of another structure of the driving sampling unit in a battery management system provided in an embodiment of this application;

[0067] Figure 8 This is a schematic diagram of another structure of the driving sampling unit in a battery management system provided in an embodiment of this application. Detailed Implementation

[0068] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0070] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0071] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0072] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0073] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0074] Currently, judging from market trends, battery management systems (BMS) are being used more and more widely. BMS are extensively applied in vehicles such as electric bicycles, motorcycles, and automobiles, as well as in military equipment and aerospace. As the application areas of BMS continue to expand, the market demand is also constantly increasing.

[0075] To address the complexity of hardware design, the applicant discovered that n battery monitoring units, drive sampling units, and battery management units can be sequentially connected in series to form a cascaded daisy chain. Each battery monitoring unit detects the characteristic parameters of each battery module; the drive sampling unit detects the temperature parameters of the battery pack and the status of the switching components, and drives the switching components according to control commands; the battery management unit outputs control commands based on the characteristic parameters of each battery module, the temperature parameters of the battery pack, and the status of the switching components. This simplifies the hardware design of the battery management system and saves hardware costs.

[0076] The battery management system disclosed in this application can be used in electrical devices. These devices can be, but are not limited to, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0077] According to some embodiments of this application, refer to Figure 1 , Figure 1A schematic diagram of a battery management system according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0078] The aforementioned battery management system is connected to at least one battery pack, the battery pack comprising n battery modules and a switching assembly, where n is a positive integer; the battery management system includes a battery management unit 01 and at least one monitoring module.

[0079] Each monitoring module includes n battery monitoring units 02 and drive sampling units 03, and the n battery monitoring units 02, drive sampling units 03 and battery management units 01 are connected in series to form a cascaded daisy chain.

[0080] Each of the n battery monitoring units 02 is connected to one of the n battery modules.

[0081] Each battery monitoring unit 02 is used to detect the characteristic parameters of each battery module.

[0082] The drive sampling unit 03 is used to detect the temperature parameters of the battery pack and the status of the switching components, and to drive the switching components according to the control commands.

[0083] The battery management unit 01 is used to output control commands based on the characteristic parameters of each battery module, the temperature parameters of the battery pack, and the status of the switching components, or to output control commands based on input commands.

[0084] It should be noted that the characteristic parameters of the battery module include its voltage, current, and temperature. The battery pack contains n battery modules connected in series and / or parallel, and the switching components include the main switch and pre-charge switch of the battery pack. The battery monitoring unit 02 is specifically used to monitor the voltage and temperature of the battery modules. Unlike the battery management unit 01, the drive sampling unit 03 does not contain a microprocessor but instead uses a battery pack monitor. The battery management unit 01 includes a microprocessor.

[0085] Understandably, in each monitoring module, each battery monitoring unit 02 detects the characteristic parameters of each battery module and transmits these parameters to the battery management unit 01 via daisy-chain communication; the drive sampling unit 03 detects the temperature parameters of the battery pack and the status of the switching components and transmits these parameters to the battery management unit 01 via daisy-chain communication; the battery management unit 01 outputs control commands based on the characteristic parameters of each battery module, the temperature parameters of the battery pack, and the status of the switching components, and the drive sampling unit 03 receives the control commands via daisy-chain communication and drives the switching components according to the control commands.

[0086] In the technical solution of this application embodiment, since n battery monitoring units 02 and drive sampling units 03 are connected in series and communicate with the battery management unit 01 in a daisy-chain cascade manner, no CAN communication connection is required, which simplifies the hardware design of the battery management system. At the same time, the drive sampling unit 03 detects the temperature parameters of the battery pack and the status of the switching components, and drives the switching components according to control commands. The battery management unit 01 outputs control commands according to the characteristic parameters of each battery module, the temperature parameters of the battery pack, and the status of the switching components. That is, all algorithms are completed by the battery management unit 01, and the drive sampling unit 03 completes the sampling and driving functions of the slave battery management unit 01 in the relevant scheme. There is no need to set up a slave battery management unit 01 containing a microprocessor, thus further simplifying the hardware design of the battery management system and reducing hardware costs.

[0087] According to some embodiments of this application, optionally, please continue to refer to Figure 2 , Figure 2 A schematic diagram of a battery management system according to another embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0088] The above battery management system, in addition to Figure 1 In addition to all the components and parts of the battery management system shown, each monitoring module also includes a detection unit 04. n battery monitoring units 02, detection units 04, and drive sampling units 03 are connected in series and communicate with the battery management unit 01 in a daisy-chain cascade manner.

[0089] The detection unit 04 is used to detect the electrical parameters of the battery pack.

[0090] The battery management unit 01 is specifically used to output control commands based on the electrical parameters of the battery pack, the characteristic parameters of each battery module, the temperature parameters of the battery pack, and the status of the switching components.

[0091] It should be noted that electrical parameters include voltage, current, and insulation status.

[0092] It is understandable that the detection unit 04 and the battery monitoring unit 02 belong to the high-voltage section, while the battery management unit 01 belongs to the low-voltage section. This achieves isolation between high and low voltage, reduces the number of high-voltage isolation devices used, and lowers costs.

[0093] Control is uniformly performed by the battery management unit 01, eliminating the need for separate controllers for the drive sampling unit 03, battery monitoring unit 02, and detection unit 04. This avoids communication and response delays caused by inconsistent controller coordination.

[0094] By adopting the above scheme, the electrical parameters of the battery pack can be detected, thereby improving the safety and reliability of the battery management system.

[0095] According to some embodiments of this application, optionally, such as Figure 3 As shown, the detection unit 04 includes a high-voltage sampling circuit 041, a current sampling circuit 042, an insulation sampling circuit 043, and a first battery pack monitor 044.

[0096] The high-voltage sampling circuit 041 is connected to the battery pack and is used to sample the voltage of the battery pack to output a voltage sampling signal.

[0097] The current sampling circuit 042 is connected to the battery pack and is used to sample the current flowing through the battery pack to output a current sampling signal.

[0098] The insulation sampling circuit 043 is connected to the battery pack and is used to detect the insulation status of the battery pack to output an insulation detection signal.

[0099] The first battery pack monitor 044 is connected to the high voltage sampling circuit 041, the current sampling circuit 042 and the insulation sampling circuit 043, and is connected in series in a daisy chain for communication. It is used to output the electrical parameters of the battery pack based on the voltage sampling signal, the current sampling signal and the insulation detection signal.

[0100] It is understandable that the high-voltage sampling circuit 041 can be a voltage divider circuit, and the current sampling circuit 042 can include a current transformer. The first battery pack monitor 044 can have multiple general-purpose input / output ports, analog-to-digital conversion ports, and support serial peripheral interface (SPI), inter-integrated circuit (IIC), and daisy-chain communication interfaces.

[0101] The detection circuit has a simple structure and low cost.

[0102] According to some embodiments of this application, optionally, such as Figure 4 As shown, the battery management unit 01 includes at least one communication module 011 and a microprocessor 012.

[0103] The communication module 011 is used to convert the first daisy-chain signal into a first serial communication signal and to convert the second serial communication signal into a second daisy-chain signal.

[0104] The microprocessor 012 is connected to at least one communication module 011 and is used to output a second serial communication signal according to the first serial communication signal.

[0105] Both the first daisy-chain signal and the first serial communication signal carry characteristic parameters of each battery module, temperature parameters of the battery pack, and status of the switching components. Both the second serial communication signal and the second daisy-chain signal carry control commands.

[0106] It is understood that, compared with the relevant battery management system, the microprocessor 012 of this application executes the algorithm functions of the main battery management system and the slave battery management system in the relevant scheme. The daisy chain is connected to the communication module 011 after being isolated by the transformer. Both the first serial communication signal and the second serial communication signal can be SPI signals.

[0107] By adopting the above scheme, the daisy-chain communication connection of the battery management unit 01 was realized, simplifying the hardware design of the battery management system.

[0108] According to some embodiments of this application, optionally, such as Figure 5 As shown, the driving sampling unit 03 includes a second battery pack monitor 031, a temperature detection circuit 032, a driving circuit 033, and a return detection circuit 034.

[0109] The second battery pack monitor 031 is used to output a third serial communication signal according to the control command, and to output the temperature parameters of the battery pack and the status of the switching components according to the temperature detection signal and the return detection signal.

[0110] Temperature detection circuit 032 is used to detect the temperature of the battery pack and output a temperature detection signal.

[0111] The drive circuit 033 is used to output multiple drive signals according to the third serial communication signal to drive the switching component.

[0112] The feedback circuit 034 is used to detect multiple drive signals and multiple current signals flowing through the switching components to output a feedback signal.

[0113] It should be noted that the driving sampling unit 03 only includes the second battery pack monitor 031 and does not use the microprocessor 012. Therefore, the driving sampling unit 03 only executes the driving function and sampling function from the battery management unit 01 in the relevant scheme, and the algorithm function from the battery management unit 01 is transferred to the battery management unit 01 to complete.

[0114] By adopting the above scheme, without configuring a microprocessor, the switching components and peripheral components (such as indicator components) are driven according to control instructions. The temperature parameters of the battery pack and the status of the switching components are detected, and the detection results are reported to the battery management unit 01 through daisy-chain communication. This simplifies the hardware design of the driving sampling unit 03 and reduces hardware costs.

[0115] According to some embodiments of this application, optionally, such as Figure 6 As shown, the driving circuit 033 includes a decoding circuit 331 and an output circuit 332.

[0116] Decoding circuit 331 is used to convert the third serial communication signal into a data signal and a first selection signal.

[0117] The output circuit 332 is used to select its own output port based on the first selection signal and output a drive signal from the output port according to the data signal.

[0118] It should be noted that, 在 If the ports of the second battery pack monitor 031 are insufficient, expansion chips with IIC and SPI interfaces can be used for expansion. For example, the control signals use an IIC interface port expansion chip (decoding circuit 331).

[0119] By adopting the above scheme, since the first selection signal selects multiple of its own output ports, and the selection signal and data signal are generated by conversion of the third serial communication signal, the port resources of the second battery pack monitor 031 are saved.

[0120] According to some embodiments of this application, the return detection circuit 034 may optionally include an analog switch circuit.

[0121] An analog switch circuit is used to sequentially select and output various drive signals and various current signals flowing through the switch component according to a second selection signal, so as to output a feedback signal.

[0122] The second battery pack monitor 031 is specifically used to output a second selection signal, output a third serial communication signal according to the control command, and output the temperature parameters of the battery pack and the status of the switching components according to the temperature detection signal and the return detection signal.

[0123] It should be noted that, 在 If the number of ports on the second battery pack monitor 031 is insufficient, expansion chips with IIC and SPI interfaces can be used for expansion. For example, if the number of ADC ports on the second battery pack monitor 031 is insufficient, a gate (analog switch circuit) can be used for expansion.

[0124] Through the above technical solution, each drive signal and each current signal flowing through the switching component can be sequentially selected and output to the second battery pack monitor 031 according to the second selection signal, thus saving the port resources of the second battery pack monitor 031.

[0125] According to some embodiments of this application, optionally, please continue to refer to Figure 7 , Figure 7 A schematic diagram of the structure of a drive sampling unit in a battery management system according to another embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0126] In the aforementioned battery management system, the driving sampling unit, in addition to... Figure 5In addition to all the components and parts of the driving sampling unit in the battery management system shown, in some embodiments, the driving sampling unit 03 also includes a power supply circuit 035 and a power supply sampling circuit 036.

[0127] The power supply circuit 035 is used to connect the input voltage and convert the input voltage into the supply voltage to power the various functional modules in the driving sampling unit 03.

[0128] The power supply sampling circuit 036 is used to sample the power supply voltage to output a power supply sampling signal.

[0129] The second battery pack monitor 031 is specifically used to output a third serial communication signal according to the control command, and to output power supply voltage information, battery pack temperature parameters and switch component status according to the power supply sampling signal, temperature detection signal and return detection signal.

[0130] It is understandable that power supply circuit 035 can be a DC-DC converter circuit, and power supply sampling circuit 036 can be a voltage divider circuit.

[0131] The above technical solution can sample the power supply voltage and report the power supply voltage information to the power management unit via daisy-chain communication, thereby improving the safety and reliability of the battery management system.

[0132] According to some embodiments of this application, optionally, please continue to refer to Figure 8 , Figure 8 A schematic diagram of the structure of a drive sampling unit in a battery management system according to another embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0133] In the aforementioned battery management system, the driving sampling unit, in addition to... Figure 5 In addition to all the components and parts of the driving sampling unit in the battery management system shown, in some embodiments, the driving sampling unit 03 also includes a dry contact detection circuit 037.

[0134] The dry contact detection circuit 037 detects the state of the switching assembly and outputs a dry contact detection signal.

[0135] The second battery pack monitor 031 is specifically used to output a third serial communication signal according to the control command, and to output power supply voltage information, battery pack temperature parameters and switch component status according to the dry contact detection signal, temperature detection signal and return detection signal.

[0136] It is understandable that dry contact signals can be converted into circuit-recognizable level signals through methods such as resistor voltage division, optocoupler isolation, or ferrite bead isolation, thereby obtaining the state of the switching component.

[0137] The above technical solution can detect the status of the switching components and report the status of the switching components to the power management unit through daisy-chain communication, thereby improving the safety and reliability of the battery management system.

[0138] According to some embodiments of this application, this application also provides an energy storage system, including a battery management system of any of the above schemes.

[0139] Since the energy storage system includes the battery management system of any of the above schemes, the hardware design of the energy storage system can be simplified, saving hardware costs.

[0140] According to some embodiments of this application, this application also provides a battery device including a battery management system of any of the above solutions.

[0141] It should be noted that the battery device is used to provide electrical energy to the electrical device. The battery device includes battery modules.

[0142] Since the battery device includes a battery management system based on any of the above solutions, the hardware design of the battery device can be simplified, and hardware costs can be saved.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery management system, characterized by, connected with at least one battery pack, the battery pack comprising n battery modules and a switch assembly, n being a positive integer; the battery management system comprising a battery management unit and at least one monitoring module; each monitoring module comprises n battery monitoring units and a driving sampling unit, and the n battery monitoring units and the driving sampling unit are sequentially connected in series in a daisy chain form to the battery management unit; n battery monitoring units are connected in one-to-one correspondence with n battery modules; each battery monitoring unit is configured to detect characteristic parameters of each battery module; the driving sampling unit is configured to detect temperature parameters of the battery pack and states of the switch assembly, and drive the switch assembly according to a control instruction; the battery management unit is configured to output the control instruction according to the characteristic parameters of each battery module, the temperature parameters of the battery pack and the states of the switch assembly, or output the control instruction according to an input instruction.

2. The battery management system of claim 1, wherein, Each of the monitoring modules further comprises a detection unit, and the n battery monitoring units, the detection unit and the driving sampling unit are sequentially connected in series in a daisy chain form to the battery management unit; the detection unit is configured to detect electrical parameters of the battery pack; the battery management unit is specifically configured to output the control instruction according to the electrical parameters of the battery pack, the characteristic parameters of each battery module, the temperature parameters of the battery pack and the states of the switch assembly.

3. The battery management system of claim 2, wherein, The detection unit comprises: a high-voltage sampling circuit connected with the battery pack, configured to sample a voltage of the battery pack to output a voltage sampling signal; a current sampling circuit connected with the battery pack, configured to sample a current flowing through the battery pack to output a current sampling signal; an insulation sampling circuit connected with the battery pack, configured to detect an insulation state of the battery pack to output an insulation detection signal; a first battery pack monitor connected with the high-voltage sampling circuit, the current sampling circuit and the insulation sampling circuit, and connected in series into the daisy chain, configured to output the electrical parameters of the battery pack according to the voltage sampling signal, the current sampling signal and the insulation detection signal.

4. The battery management system of claim 1, wherein, The battery management unit comprises at least one communication module and a microprocessor; the communication module is configured to convert a first daisy chain signal into a first serial communication signal, and convert a second serial communication signal into a second daisy chain signal; the microprocessor is connected with at least one communication module, configured to output the second serial communication signal according to the first serial communication signal; the first daisy chain signal and the first serial communication signal both carry the characteristic parameters of each battery module, the temperature parameters of the battery pack and the states of the switch assembly, and the second serial communication signal and the second daisy chain signal both carry control instructions.

5. The battery management system of claim 1, wherein, The driving sampling unit comprises: a second battery pack monitor configured to output a third serial communication signal according to the control instruction, and output the temperature parameters of the battery pack and the states of the switch assembly according to the temperature detection signal and a back detection signal; a temperature detection circuit configured to detect a temperature of the battery pack and output a temperature detection signal; a driving circuit configured to output a plurality of driving signals according to the third serial communication signal to drive the switch assembly; a back-checking circuit configured to detect the plurality of driving signals and a plurality of current signals flowing through the switch assembly to output the back-checking signal.

6. The battery management system of claim 5, wherein, The driving circuit comprises: a decoding circuit configured to convert the third serial communication signal into a data signal and a first selection signal; an output circuit configured to select an output port of itself based on the first selection signal and output a driving signal from the output port according to the data signal.

7. The battery management system of claim 5, wherein, The back-checking circuit comprises: an analog switch circuit configured to sequentially select each driving signal and each current signal flowing through the switch assembly according to a second selection signal to output a back-checking signal; The second battery pack monitor is specifically configured to output the second selection signal, output the third serial communication signal according to the control instruction, and output a temperature parameter of the battery pack and a state of the switch assembly according to the temperature detection signal and the back-checking signal.

8. The battery management system of claim 5, wherein, The driving sampling unit further comprises: a power supply circuit configured to access an input voltage and convert the input voltage into a supply voltage to supply power to each functional module in the driving sampling unit; a power supply sampling circuit configured to sample the supply voltage to output a supply sampling signal; The second battery pack monitor is specifically configured to output the third serial communication signal according to the control instruction, and output supply voltage information, a temperature parameter of the battery pack and a state of the switch assembly according to the supply sampling signal, the temperature detection signal and the back-checking signal.

9. The battery management system of claim 5, wherein, The driving sampling unit further comprises: a dry contact detection circuit configured to detect the state of the switch assembly to output a dry contact detection signal; The second battery pack monitor is specifically configured to output the third serial communication signal according to the control instruction, and output supply voltage information, a temperature parameter of the battery pack and a state of the switch assembly according to the dry contact detection signal, the temperature detection signal and the back-checking signal.

10. The battery management system of claim 5, wherein, The driving sampling unit further comprises: a Hall sensing circuit configured to detect a current of the battery pack to output a current detection signal; The second battery pack monitor is specifically configured to output the third serial communication signal according to the control instruction, and output a current parameter of the battery pack, a temperature parameter of the battery pack and a state of the switch assembly according to the current detection signal, the temperature detection signal and the back-checking signal.

11. An energy storage system characterized by, The energy storage system comprises the battery management system according to any one of claims 1 to 10.

12. A battery device characterized by comprising: The battery device comprises the battery management system according to any one of claims 1 to 10.

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