Energy storage device

Abstract

The invention discloses an energy storage device which comprises a communication bus and a plurality of stacked energy storage battery packs. Each energy storage battery pack is provided with a voltage division sampling module and a micro-control unit, and each voltage division sampling module comprises a first voltage division element, a second voltage division element and a third voltage division element which are sequentially connected in series; in each energy storage battery pack, the first end of the second voltage dividing element is connected to the sampling port of the micro-control unit; in any energy storage battery pack except the last energy storage battery pack, the second end of the second voltage dividing element is connected to the first end of the second voltage dividing element in the next energy storage battery pack; and each micro-control unit is connected to the communication bus. And the physical position of the device can be determined through the sequence of the sampling voltages.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to an energy storage device. Background Art

[0002] At present, in low-voltage stacked household energy storage devices, battery pack modules are stacked up and down and output in parallel to form an overall system. Battery pack modules are universal modules in both hardware and software. After the system is formed, the software will not be able to determine the specific installation location of each battery pack module. When a fault occurs, the software system cannot guide the user to quickly and intuitively find the faulty battery pack module. To solve this problem, related technologies include setting a dip switch on the battery pack module to assign a physical address to each battery pack module, or manually configuring the physical address on site to achieve the correspondence between the software ID and the physical location. However, all of the above methods involve manual operation during the installation and debugging phase, which increases the difficulty of installation and debugging, and there is a risk of configuration errors. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide an energy storage device that can determine its own physical position by sorting the magnitudes of sampled voltages.

[0004] An embodiment of the present invention provides an energy storage device, comprising a plurality of stacked energy storage battery packs and a communication bus; Each of the energy storage battery packs is provided with a voltage division sampling module and a micro control unit, and each of the voltage division sampling modules includes a first voltage division element, a second voltage division element and a third voltage division element which are sequentially connected in series; In each of the energy storage battery packs, the first end of the second voltage dividing element is connected to a sampling port of the micro control unit; In any energy storage battery pack except the last energy storage battery pack, the second end of the second voltage dividing element is connected to the first end of the second voltage dividing element in the next energy storage battery pack; Each of the micro control units is connected to the communication bus.

[0005] The energy storage device provided by the embodiment of the present invention has at least the following beneficial effects: in the voltage-dividing sampling module of each energy storage battery pack, both ends of the second voltage-dividing element bear a certain voltage division; by connecting the second voltage-dividing elements in a plurality of voltage-dividing sampling modules in sequence, the sampling voltage acquired by the sampling port of the micro-control unit in the next energy storage battery pack is greater than the sampling voltage acquired by the sampling port of the micro-control unit in the previous energy storage battery pack; in addition, each micro-control unit is connected to the communication bus, so that the sampling voltage acquired by itself can be sent to other micro-control units, and the sampling voltage sent by other micro-control units can be acquired from the communication bus, so that its own physical position can be determined according to the size sorting of all the sampling voltages.

[0006] The energy storage device according to some embodiments of the present invention, in each of the energy storage battery packs, further includes a current limiting resistor arranged between the first end of the second voltage dividing element and the sampling port of the micro control unit.

[0007] According to the energy storage device of some embodiments of the present invention, in each of the energy storage battery packs, the first voltage dividing element is connected to a DC power supply terminal, and the third voltage dividing element is grounded.

[0008] According to the energy storage device of some embodiments of the present invention, a plurality of the third voltage dividing elements are connected to a common ground.

[0009] In the energy storage device according to some embodiments of the present invention, the first voltage dividing element and the third voltage dividing element are resistors, and the second voltage dividing element is a diode.

[0010] According to the energy storage device of some embodiments of the present invention, the first end of the second voltage divider element is the cathode of the diode, and the second end of the second voltage divider element is the anode of the diode.

[0011] According to the energy storage device of some embodiments of the present invention, the first voltage dividing element, the second voltage dividing element and the third voltage dividing element are all resistors.

[0012] In the energy storage device according to some embodiments of the present invention, the resistance values ​​of the first voltage dividing element and the third voltage dividing element are greater than the resistance value of the second voltage dividing element.

[0013] In the energy storage device according to some embodiments of the present invention, the communication bus is a CAN communication bus.

[0014] According to the energy storage device of some embodiments of the present invention, the micro control unit is a control module of a battery management system of the energy storage battery pack.

[0015] In the energy storage device according to some embodiments of the present invention, in each of the energy storage battery packs, the micro control unit is used to obtain a sampled voltage through the sampling port and send the sampled voltage to the communication bus.

[0016] According to the energy storage device of some embodiments of the present invention, the micro control unit is also used for: Acquire the sampled voltages of other energy storage battery packs from the communication bus; A physical address is determined according to the results of sorting the magnitudes of all the sampled voltages, and the physical address is used as a communication address.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments; Figure 1 is a circuit schematic diagram of an energy storage device provided by an embodiment of the present invention; Figure 2 It is a circuit schematic diagram of an energy storage device provided in another embodiment of the present invention. DETAILED DESCRIPTION

[0020] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0021] In the description of the embodiments of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "at least one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0022] It should be noted that the terms such as setting, installing, and connecting in the embodiments of the present invention should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0023] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] At present, in low-voltage stacked household energy storage devices, battery pack modules are stacked up and down and output in parallel to form an overall system. Battery pack modules are universal modules in both hardware and software. After the system is formed, the software will not be able to determine the specific installation location of each battery pack module. When a fault occurs, the software system cannot guide the user to quickly and intuitively find the faulty battery pack module. To solve this problem, related technologies include setting a dip switch on the battery pack module to assign a physical address to each battery pack module, or manually configuring the physical address on site to achieve the correspondence between the software ID and the physical location. However, all of the above methods involve manual operation during the installation and debugging phase, which increases the difficulty of installation and debugging, and there is a risk of configuration errors.

[0025] Based on this, an embodiment of the present invention provides an energy storage device that can determine its own physical position by sorting the magnitudes of sampled voltages.

[0026] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0027] Figure 1 is a circuit diagram of an energy storage device provided by an embodiment of the present invention. Figure 1 The energy storage device provided by the embodiment of the present invention includes a plurality of stacked energy storage battery packs 100 and a communication bus 200 .

[0028] Each energy storage battery pack 100 is provided with a voltage division sampling module 110 and a micro control unit 120, and each voltage division sampling module 110 includes a first voltage division element, a second voltage division element and a third voltage division element connected in series in sequence; specifically, Figure 1In the voltage-dividing sampling module 110, the first voltage-dividing element is the first resistor R1, the second voltage-dividing element is the diode D1, and the third voltage-dividing element is the second resistor R2. One end of the first resistor R1 is connected to the DC power supply terminal VCC, the other end of the first resistor R1 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded. During the sampling process of the voltage-dividing sampling module 110, the first resistor R1, the diode D1 and the second resistor R2 jointly divide the voltage between the DC power supply terminal VCC and the ground terminal, and each voltage-dividing element is subjected to a certain amount of voltage division.

[0029] In each energy storage battery pack 100, the first end of the second voltage divider element is connected to the sampling port of the micro control unit 120; specifically, Figure 1 In the embodiment, the first end of the second voltage divider element is the cathode of the diode D1 , that is, the micro control unit 120 obtains the sampled voltage at the connection point between the cathode of the diode D1 and the second resistor R2 through the sampling port.

[0030] In any energy storage battery pack 100 except the last energy storage battery pack 100, the second end of the second voltage divider element is connected to the first end of the second voltage divider element in the next energy storage battery pack 100; specifically, Figure 1 In the embodiment, the second end of the second voltage-dividing element is the anode of the diode D1; the anode of the diode D1 in the voltage-dividing sampling module 110 of the first energy storage battery pack 100 is connected to the cathode of the diode D1 in the voltage-dividing sampling module 110 of the second energy storage battery pack 100; the anode of the diode D1 in the voltage-dividing sampling module 110 of the second energy storage battery pack 100 is connected to the cathode of the diode D1 in the voltage-dividing sampling module 110 of the third energy storage battery pack 100; ...; the anode of the diode D1 in the voltage-dividing sampling module 110 of the n-1th energy storage battery pack 100 is connected to the cathode of the diode D1 in the voltage-dividing sampling module 110 of the nth energy storage battery pack 100; n is the number of energy storage battery packs 100 included in the energy storage device, and n is a positive integer greater than 2. In addition, generally, the first energy storage battery pack 100 is the topmost one among the multiple stacked energy storage battery packs 100 of the energy storage device, the second energy storage battery pack 100 is the one below the first energy storage battery pack 100, and the nth energy storage battery pack 100 is the bottommost one among the multiple stacked energy storage battery packs 100 of the energy storage device.

[0031] Each MCU 120 is connected to a communication bus 200. In some embodiments, the communication bus 200 is a CAN communication bus 200.

[0032] According to the energy storage device provided by the embodiment of the present invention, in the voltage division sampling module 110 of each energy storage battery pack 100, both ends of the second voltage division element bear a certain voltage division; by connecting the second voltage division elements in multiple voltage division sampling modules 110 in sequence, the sampling voltage obtained by the sampling port of the micro control unit 120 in the next energy storage battery pack 100 is greater than the sampling voltage obtained by the sampling port of the micro control unit 120 in the previous energy storage battery pack 100; in addition, each micro control unit 120 is connected to the communication bus 200, so that the sampling voltage obtained by itself can be sent to other micro control units 120, and the sampling voltage sent by other micro control units 120 can be obtained from the communication bus 200, and then the physical position of itself can be determined according to the size sorting of all the sampling voltages.

[0033] Reference Figure 1 In the energy storage device of some embodiments of the present invention, each energy storage battery pack 100 further includes a current limiting resistor disposed between the first end of the second voltage divider element and the sampling port of the micro control unit 120. Specifically, the current limiting resistor is a third resistor R3, that is, the connection point between the anode of the diode D1 and the second resistor R2 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the sampling port of the micro control unit 120.

[0034] In this embodiment, a current limiting circuit is provided at the sampling port of the microcontroller unit 120 to protect the microcontroller unit 120 and prevent the microcontroller unit 120 from being damaged due to excessive current or voltage at the sampling point during the sampling process of the voltage-dividing sampling module 110 .

[0035] Reference Figure 1In the energy storage device of some embodiments of the present invention, in each energy storage battery pack 100, the first voltage-dividing element is connected to the DC power supply terminal VCC, and the third voltage-dividing element is grounded. In addition, a plurality of third voltage-dividing elements are connected to a common ground. It is understood that the DC power supply terminal VCC may be the output terminal of a DC / DC power conversion module provided inside the energy storage battery pack 100, and the output terminal of the DC / DC power conversion module may also be used as the power supply of the micro control unit 120. In addition, a plurality of third voltage-dividing elements are connected to the common ground, that is, the second resistors R2 in the voltage-dividing sampling modules 110 of each energy storage battery pack 100 are connected to the common ground. Since the forward conduction voltage drop of the diode D1 is a constant value, the sampling voltage obtained by the microcontroller unit 120 in the first energy storage battery pack 100 is the voltage across the second resistor R2, and the sampling voltage obtained by the microcontroller unit 120 in the second energy storage battery pack 100 is the voltage value obtained by adding the sampling voltage obtained by the microcontroller unit 120 in the first energy storage battery pack 100 to the forward conduction voltage drop of the diode D1; ...; the sampling voltage obtained by the microcontroller unit 120 in the nth energy storage battery pack 100 is the voltage value obtained by adding the sampling voltage obtained by the microcontroller unit 120 in the n-1th energy storage battery pack 100 to the forward conduction voltage drop of the diode D1. Therefore, the sampling voltages obtained by the microcontroller units 120 in each battery pack 100 are different, and the voltage value corresponding to the forward conduction voltage drop of a diode D1 increases from front to back.

[0036] In the energy storage device of some embodiments of the present invention, the micro control unit 120 is a control module of a battery management system of the energy storage battery pack 100 .

[0037] It is understandable that each energy storage battery pack 100 is internally provided with a battery management system, that is, a BMS system, so the control module of the battery management system of the energy storage battery pack 100 can be reused as the microcontroller unit 120 of the energy storage battery pack 100 of this embodiment, avoiding the need to set up multiple control modules for the energy storage battery pack 100.

[0038] In the energy storage devices of some embodiments of the present invention, in each energy storage battery pack 100 , the micro control unit 120 is used to obtain a sampled voltage through a sampling port and send the sampled voltage to the communication bus 200 .

[0039] In this embodiment, the micro control unit 120 sends the sampled voltage collected by itself to the communication bus 200 so that other micro control units 120 connected to the communication bus 200 can receive the sampled voltage. It can be understood that the micro control unit 120 can determine the number of energy storage battery packs 100 included in the energy storage device by the number of sampled voltages received from the communication bus 200. For example, the micro control unit 120 receives 5 sampled voltages from the communication bus 200, combined with 1 sampled voltage collected by itself, a total of 6 sampled voltages, so it can be determined that the energy storage device includes 6 energy storage battery packs 100.

[0040] In the energy storage device of some embodiments of the present invention, the micro control unit 120 is also used for: Obtaining sampled voltages of other energy storage battery packs 100 from the communication bus 200; The physical address is determined according to the results of sorting all the sampled voltages, and is used as the communication address.

[0041] In this embodiment, after the microcontroller unit 120 obtains the sampled voltages of other energy storage battery packs 100 from the communication bus 200, it compares all the sampled voltages with each other in combination with the sampled voltages collected by itself, and then sorts them in order of magnitude. The energy storage battery pack 100 corresponding to the sampled voltage with the smallest voltage value is the first energy storage battery pack 100, that is, the top one of the multiple stacked energy storage battery packs 100 of the energy storage device, and the physical address of the energy storage battery pack 100 can be set to 1, and the physical address 1 can be used as the communication address; the sampled voltage with the second smallest voltage value corresponds to the first energy storage battery pack 100, that is, the top one of the multiple stacked energy storage battery packs 100 of the energy storage device, and the physical address 1 ... used as the communication address. The energy storage battery pack 100 corresponding to the sampling voltage with the largest voltage value is the one at the bottom of the multiple stacked energy storage battery packs 100 of the energy storage device, and the physical address of the energy storage battery pack 100 can be set to n, and the physical address n can be used as the communication address. After the communication addresses of all the energy storage battery packs 100 in the energy storage device are reconfigured, communication can be reestablished through the communication bus 200. At this point, the energy storage device can recognize the physical address of the energy storage battery pack 100 and match the communication address.

[0042] Figure 2 is a circuit diagram of an energy storage device provided by another embodiment of the present invention. Figure 2 The energy storage device provided by the embodiment of the present invention includes a plurality of stacked energy storage battery packs 100 and a communication bus 200 .

[0043] Each energy storage battery pack 100 is provided with a voltage division sampling module 110 and a micro control unit 120, and each voltage division sampling module 110 includes a first voltage division element, a second voltage division element and a third voltage division element connected in series in sequence; specifically, Figure 2 In the voltage-dividing sampling module 110, the first voltage-dividing element is the first resistor R1, the second voltage-dividing element is the fourth resistor R4, the third voltage-dividing unit is the second resistor R2, one end of the first resistor R1 is connected to the DC power supply terminal VCC, the other end of the first resistor R1 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded; during the sampling process of the voltage-dividing sampling module 110, the first resistor R1, the fourth resistor R4 and the second resistor R2 jointly divide the voltage between the DC power supply terminal VCC and the ground terminal, and each voltage-dividing element is subjected to a certain amount of voltage division.

[0044] In each energy storage battery pack 100, the first end of the second voltage divider element is connected to the sampling port of the micro control unit 120; specifically, Figure 2 In the example, the first end of the second voltage divider element is the connection point between the fourth resistor R4 and the second resistor R2, that is, the micro control unit 120 obtains the sampled voltage at the connection point between the fourth resistor R4 and the second resistor R2 through the sampling port.

[0045] In any energy storage battery pack 100 except the last energy storage battery pack 100, the second end of the second voltage divider element is connected to the first end of the second voltage divider element in the next energy storage battery pack 100; specifically, Figure 2In the embodiment, the second end of the second voltage-dividing element is the connection point between the fourth resistor R4 and the first resistor R1; the connection point between the fourth resistor R4 and the first resistor R1 in the voltage-dividing sampling module 110 of the first energy storage battery pack 100 is connected to the connection point between the fourth resistor R4 and the second resistor R2 in the voltage-dividing sampling module 110 of the second energy storage battery pack 100; the connection point between the fourth resistor R4 and the first resistor R1 in the voltage-dividing sampling module 110 of the second energy storage battery pack 100 is connected to the connection point between the fourth resistor R4 and the second resistor R2 in the voltage-dividing sampling module 110 of the third energy storage battery pack 100; ...; the connection point between the fourth resistor R4 and the first resistor R1 in the voltage-dividing sampling module 110 of the n-1th energy storage battery pack 100 is connected to the connection point between the fourth resistor R4 and the second resistor R2 in the voltage-dividing sampling module 110 of the nth energy storage battery pack 100; n is the number of energy storage battery packs 100 included in the energy storage device, and n is a positive integer greater than 2. In addition, generally, the first energy storage battery pack 100 is the topmost one among the multiple stacked energy storage battery packs 100 of the energy storage device, the second energy storage battery pack 100 is the one below the first energy storage battery pack 100, and the nth energy storage battery pack 100 is the bottommost one among the multiple stacked energy storage battery packs 100 of the energy storage device.

[0046] Each MCU 120 is connected to a communication bus 200. In some embodiments, the communication bus 200 is a CAN communication bus 200.

[0047] According to the energy storage device provided by the embodiment of the present invention, in the voltage division sampling module 110 of each energy storage battery pack 100, both ends of the second voltage division element bear a certain voltage division; by connecting the second voltage division elements in multiple voltage division sampling modules 110 in sequence, the sampling voltage obtained by the sampling port of the micro control unit 120 in the next energy storage battery pack 100 is greater than the sampling voltage obtained by the sampling port of the micro control unit 120 in the previous energy storage battery pack 100; in addition, each micro control unit 120 is connected to the communication bus 200, so that the sampling voltage obtained by itself can be sent to other micro control units 120, and the sampling voltage sent by other micro control units 120 can be obtained from the communication bus 200, and then the physical position of itself can be determined according to the size sorting of all the sampling voltages.

[0048] Reference Figure 2In the energy storage device of some embodiments of the present invention, each energy storage battery pack 100 further includes a current limiting resistor disposed between the first end of the second voltage divider element and the sampling port of the micro control unit 120. Specifically, the current limiting resistor is the third resistor R3, that is, the connection point between the fourth resistor R4 and the second resistor R2 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the sampling port of the micro control unit 120.

[0049] In this embodiment, a current limiting circuit is provided at the sampling port of the microcontroller unit 120 to protect the microcontroller unit 120 and prevent the microcontroller unit 120 from being damaged due to excessive current or voltage at the sampling point during the sampling process of the voltage-dividing sampling module 110 .

[0050] Reference Figure 2 In the energy storage device of some embodiments of the present invention, in each energy storage battery pack 100, the first voltage-dividing element is connected to the DC power supply terminal VCC, and the third voltage-dividing element is grounded. In addition, a plurality of third voltage-dividing elements are connected to a common ground. It is understood that the DC power supply terminal VCC may be the output terminal of a DC / DC power conversion module provided inside the energy storage battery pack 100, and the output terminal of the DC / DC power conversion module may also be used as the power supply of the micro control unit 120. In addition, a plurality of third voltage-dividing elements are connected to the common ground, that is, the second resistors R2 in the voltage-dividing sampling modules 110 of each energy storage battery pack 100 are connected to the common ground. Since the voltage-dividing voltage across the fourth resistor R4 is a constant value, the sampling voltage obtained by the microcontroller unit 120 in the first energy storage battery pack 100 is the voltage across the second resistor R2, and the sampling voltage obtained by the microcontroller unit 120 in the second energy storage battery pack 100 is the sampling voltage obtained by the microcontroller unit 120 in the first energy storage battery pack 100 plus the voltage value of the voltage-dividing voltage across the fourth resistor R4; ...; the sampling voltage obtained by the microcontroller unit 120 in the nth energy storage battery pack 100 is the sampling voltage obtained by the microcontroller unit 120 in the n-1th energy storage battery pack 100 plus the voltage value of the voltage-dividing voltage across the fourth resistor R4. Therefore, the sampling voltages obtained by the microcontroller units 120 in each battery pack 100 are different, and the voltage value corresponding to the voltage-dividing voltage across the fourth resistor R4 increases from front to back.

[0051] In the energy storage device of some embodiments of the present invention, the micro control unit 120 is a control module of a battery management system of the energy storage battery pack 100 .

[0052] It is understandable that each energy storage battery pack 100 is internally provided with a battery management system, that is, a BMS system, so the control module of the battery management system of the energy storage battery pack 100 can be reused as the microcontroller unit 120 of the energy storage battery pack 100 of this embodiment, avoiding the need to set up multiple control modules for the energy storage battery pack 100.

[0053] In the energy storage devices of some embodiments of the present invention, in each energy storage battery pack 100 , the micro control unit 120 is used to obtain a sampled voltage through a sampling port and send the sampled voltage to the communication bus 200 .

[0054] In this embodiment, the micro control unit 120 sends the sampled voltage collected by itself to the communication bus 200 so that other micro control units 120 connected to the communication bus 200 can receive the sampled voltage. It can be understood that the micro control unit 120 can determine the number of energy storage battery packs 100 included in the energy storage device by the number of sampled voltages received from the communication bus 200. For example, the micro control unit 120 receives 5 sampled voltages from the communication bus 200, combined with 1 sampled voltage collected by itself, a total of 6 sampled voltages, so it can be determined that the energy storage device includes 6 energy storage battery packs 100.

[0055] In the energy storage device of some embodiments of the present invention, the micro control unit 120 is also used for: Obtaining sampled voltages of other energy storage battery packs 100 from the communication bus 200; The physical address is determined according to the results of sorting all the sampled voltages, and is used as the communication address.

[0056] In this embodiment, after the microcontroller unit 120 obtains the sampled voltages of other energy storage battery packs 100 from the communication bus 200, it compares all the sampled voltages with each other in combination with the sampled voltages collected by itself, and then sorts them in order of magnitude. The energy storage battery pack 100 corresponding to the sampled voltage with the smallest voltage value is the first energy storage battery pack 100, that is, the top one of the multiple stacked energy storage battery packs 100 of the energy storage device, and the physical address of the energy storage battery pack 100 can be set to 1, and the physical address 1 can be used as the communication address; the sampled voltage with the second smallest voltage value corresponds to the first energy storage battery pack 100, that is, the top one of the multiple stacked energy storage battery packs 100 of the energy storage device, and the physical address 1 ... used as the communication address. The energy storage battery pack 100 corresponding to the sampling voltage with the largest voltage value is the one at the bottom of the multiple stacked energy storage battery packs 100 of the energy storage device, and the physical address of the energy storage battery pack 100 can be set to n, and the physical address n can be used as the communication address. After the communication addresses of all the energy storage battery packs 100 in the energy storage device are reconfigured, communication can be reestablished through the communication bus 200. At this point, the energy storage device can recognize the physical address of the energy storage battery pack 100 and match the communication address.

[0057] In the energy storage device of some embodiments of the present invention, the resistance of the first voltage divider element and the third voltage divider element is greater than the resistance of the second voltage divider element. That is, the resistance of the first resistor R1 and the second resistor R2 needs to be greater than the resistance of the fourth resistor R4. In some cases, the resistance of the first resistor R1 and the second resistor R2 is much greater than the resistance of the fourth resistor R4. For example, the first resistor R1 is 51KΩ, the second resistor R2 is 10KΩ, and the fourth resistor R4 is 100Ω.

[0058] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed methods above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium or a non-transitory medium and a communication medium or a temporary medium. As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk DVD or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0059] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An energy storage device, characterized in that: It includes a plurality of stacked energy storage battery packs and a communication bus; Each of the energy storage battery packs is provided with a voltage division sampling module and a micro control unit, and each of the voltage division sampling modules includes a first voltage division element, a second voltage division element and a third voltage division element which are sequentially connected in series; In each of the energy storage battery packs, the first end of the second voltage dividing element is connected to a sampling port of the micro control unit; In any energy storage battery pack except the last energy storage battery pack, the second end of the second voltage dividing element is connected to the first end of the second voltage dividing element in the next energy storage battery pack; Each of the micro control units is connected to the communication bus.

2. The energy storage device according to claim 1, characterized in that: Each of the energy storage battery packs also includes a current limiting resistor arranged between the first end of the second voltage dividing element and the sampling port of the micro control unit.

3. The energy storage device according to claim 1, characterized in that: In each of the energy storage battery packs, the first voltage dividing element is connected to a DC power supply terminal, and the third voltage dividing element is grounded.

4. The energy storage device according to claim 3, characterized in that: The plurality of third voltage dividing elements are connected to a common ground.

5. The energy storage device according to claim 1, characterized in that: The first voltage dividing element and the third voltage dividing element are resistors, and the second voltage dividing element is a diode.

6. The energy storage device according to claim 5, characterized in that: The first end of the second voltage-dividing element is the cathode of the diode, and the second end of the second voltage-dividing element is the anode of the diode.

7. The energy storage device according to claim 1, characterized in that: The first voltage dividing element, the second voltage dividing element and the third voltage dividing element are all resistors.

8. The energy storage device according to claim 7, characterized in that: The resistance values ​​of the first voltage dividing element and the third voltage dividing element are greater than the resistance value of the second voltage dividing element.

9. The energy storage device according to claim 1, characterized in that: The communication bus is a CAN communication bus.

10. The energy storage device according to claim 1, characterized in that: The micro control unit is a control module of the battery management system of the energy storage battery pack.

11. The energy storage device according to claim 1, characterized in that: In each of the energy storage battery packs, the micro control unit is used to obtain a sampled voltage through the sampling port and send the sampled voltage to the communication bus.

12. The energy storage device according to claim 11, characterized in that: The micro control unit is also used for: Acquire the sampled voltages of other energy storage battery packs from the communication bus; A physical address is determined according to the results of sorting the magnitudes of all the sampled voltages, and the physical address is used as a communication address.

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