Device and method for identifying physical location of battery pack, and method for addressing during photovoltaic power station start-up

Abstract

The present invention relates to a device and method for identifying the physical location of a battery pack and a method for addressing during photovoltaic power station start-up. The device and method for identifying the physical location of a battery pack simplify a physical architecture for identifying the physical location of a battery pack. Automatic address allocation is implemented by means of a dedicated address bus. Compared with a conventional method of using a physical dial switch or manually calibrating the address of a battery pack, the present invention has higher processing efficiency and handling reliability. In addition, the mounting efficiency for a battery pack and even for a photovoltaic power station can be effectively increased. Physical location identification of a battery pack is triggered when a station start-up operation is executed, and automatic power-on and location identification of the battery pack are achieved, reducing user operations at the beginning. Operations such as battery pack physical location identification and photovoltaic power station start-up parameter configuration are performed in parallel, thus the time for station start-up can be effectively shortened and the user experience is improved.

Description

Battery pack physical location identification device and method, photovoltaic power station start-up addressing method Technical Field

[0001] The present invention relates to the field of photovoltaic control technology, in particular to the field of photovoltaic power station management technology, and specifically to a battery pack physical location identification device and method, and a photovoltaic power station start-up addressing method. Background Art

[0002] A photovoltaic power station is a power generation system that utilizes sunlight, employs solar panels made of special materials such as crystalline silicon, and consists of inverters and other electronic components. It can be connected to the power grid and transmit electricity bidirectionally. Photovoltaic power stations are among the green power development projects most strongly encouraged by the government. During operation, solar panels generate direct current (DC) and convert it into alternating current (AC), which is then applied to the power system of a home or business. When the power generated by the solar energy storage device exceeds the load demand, the PV system stores the excess energy in the energy storage device. When sunlight is insufficient or the load demand exceeds the PV system's power generation, the energy storage device takes over the power supply to maintain normal load operation.

[0003] Energy storage equipment can generally include at least one battery pack. In order to facilitate the management and maintenance of each battery pack, it is necessary to quickly locate the physical position of the battery pack in the photovoltaic power station energy storage equipment. The main method currently used is to add a dip switch connected to the internal controller at the location of each battery pack, and adjust the number of bits of the dip switch to set the physical position of each controller using binary coding. However, this method requires individual settings for each battery pack controller, which has a high error rate and low setting efficiency. In addition, there are also some methods for automatically determining the physical location of the battery pack, but the method is relatively complicated, and after the physical location of the battery pack is identified and determined, the terminal matching resistor still needs to be installed manually, resulting in the installation efficiency still needing to be improved.

[0004] Summary of the Invention

[0005] A main purpose of the present invention is to overcome at least one of the above-mentioned defects, and to provide a battery pack physical position identification device with a simple overall structure and low implementation cost, while being able to effectively improve the efficiency of battery pack physical position identification.

[0006] Another main purpose of the present invention is to overcome at least one of the above-mentioned defects, and to provide a method for identifying the physical position of a battery pack, which can automatically calibrate the physical position of the battery pack, improve the identification efficiency, and effectively improve the reliability of the physical position identification of the battery pack.

[0007] Another main purpose of the present invention is to overcome at least one of the above-mentioned defects, and to provide a photovoltaic power station start-up addressing method that can complete the automatic calibration of the physical position of the battery pack at the same time as the photovoltaic station is started, thereby improving the recognition efficiency, shortening the photovoltaic station start-up time, and improving the user experience.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] The present invention provides a battery pack physical location identification device for a photovoltaic power station with a photovoltaic energy storage device, wherein the energy storage device includes a plurality of battery packs, and the photovoltaic power station includes an inverter. The battery pack physical location identification device includes a main controller, wherein:

[0010] The battery packs are electrically connected to the inverter via power lines, and the battery packs are connected to the inverter via address calibration lines, which are used to transmit physical location identification signals. The main controller is communicatively connected to the inverter and each battery pack via a communication bus.

[0011] According to one embodiment of the present invention, the battery packs are sequentially connected in parallel via power lines, and the address configuration interfaces of the battery packs are sequentially connected one by one via address calibration lines.

[0012] According to one embodiment of the present invention, the battery packs are sequentially connected in parallel via power lines, a battery controller is provided in each battery pack, and the digital interfaces of the battery controllers are sequentially connected via address calibration lines.

[0013] According to one embodiment of the present invention, the inverter is electrically connected to at least one of the several battery packs through a power line, and the inverter has an inverter controller, and the digital interface of the inverter controller is connected to the digital interface of the battery pack connected to the inverter through an address calibration line.

[0014] According to one embodiment of the present invention, the main controller is communicatively connected with the inverter controller and each battery controller via a communication bus.

[0015] According to one embodiment of the present invention, the battery controller has at least one set of digital interfaces, and the digital interfaces of two battery controllers are connected via the address calibration line, so as to connect the plurality of battery packs in sequence.

[0016] According to one embodiment of the present invention, among the plurality of battery packs connected sequentially, the digital input interface of the battery controller of the battery pack located at the end is connected to the digital output interface of the inverter through an address calibration line.

[0017] According to one embodiment of the present invention, each group of digital interfaces includes a digital input interface and a digital output interface. Among the battery packs connected sequentially, the digital input interface of one battery pack is connected to the digital output interface of the previous battery pack via an address calibration line, and the digital output interface of one battery pack is connected to the digital input interface of the next battery pack via an address calibration line.

[0018] According to one embodiment of the present invention, each battery pack is respectively configured with a terminal matching resistor and an electronically controlled switch, and the terminal matching resistor and the electronically controlled switch are connected in series and then connected in parallel to the communication bus.

[0019] According to one embodiment of the present invention, an electrically controllable start switch is provided in each of the battery packs, and the main controller is connected to each of the start switches via an auxiliary source control line to complete the startup of the battery pack.

[0020] According to one embodiment of the present invention, the main controller is an inverter controller of an inverter, and the inverter controller is communicatively connected with each battery controller via a communication bus.

[0021] According to one embodiment of the present invention, the communication bus is an RS485 bus or a CAN bus.

[0022] In particular, the present invention further provides a method for identifying the physical position of a battery pack, based on the above-mentioned device for identifying the physical position of a battery pack, characterized in that it includes the following steps:

[0023] Step S1: The main controller sends a start device search instruction to the inverter;

[0024] Step S2: After receiving the device search instruction, the inverter sends a physical location initial identification signal to the nth battery pack connected to it;

[0025] Step S3: the nth battery pack determines an initial position according to the physical position initial identification signal sent by the inverter, and sends a physical position intermediate identification signal to the (n+1)th battery pack connected thereto;

[0026] Step S4: The (n+1)th battery pack connected to the nth battery pack determines its own physical position based on the physical position intermediate identification signal, and the (n+1)th battery pack continues to send a physical position intermediate identification signal to the (n+2)th battery pack connected to it to determine the physical position of the (n+2)th battery pack, where n is an integer greater than or equal to 1.

[0027] According to one embodiment of the present invention, step S5 is also included: after all battery packs complete physical position identification, the main controller sends a terminal resistance closing trigger signal to the battery pack that last confirms its physical position through the communication bus, and the battery pack that last confirms its physical position closes the electric control switch in the battery pack upon receiving the terminal resistance closing trigger signal, and the communication bus is connected to the terminal matching resistor at the tail end.

[0028] According to one embodiment of the present invention, the terminal matching resistor at the head end of the communication bus is located in the main controller.

[0029] According to one embodiment of the present invention, in step S1, the main controller also sends a black start signal to the start switch in the battery pack through the auxiliary source control line. After receiving the black start signal, the start switch in the battery pack closes the power supply of the battery controller to complete the startup of the battery pack.

[0030] According to one embodiment of the present invention, the main controller assigns a virtual address to each battery pack via a communication bus, and the main controller maintains communication with the battery pack to which the virtual address assignment is completed, so as to obtain the number of battery packs.

[0031] According to one embodiment of the present invention, the battery pack that has obtained the virtual address feeds back its current physical location through the communication bus. If the battery pack has not yet been assigned a physical location, an invalid physical location is fed back to detect the completion rate of the battery pack physical location identification.

[0032] According to one embodiment of the present invention, the physical position intermediate identification signal is a square wave signal, and the battery pack determines its own physical position according to the frequency or duty cycle of the received physical position intermediate identification signal.

[0033] In particular, the present invention also provides a photovoltaic power station start-up addressing method, which issues photovoltaic station start-up instructions and performs station start-up configuration through a terminal. While the station start-up instructions are being issued, the physical location of the battery pack is automatically searched and determined. The process of searching and determining the physical location of the battery pack adopts the battery pack physical location identification method described above.

[0034] According to one embodiment of the present invention, after the physical location of the battery pack is searched and determined, the physical location of each battery pack is reported to the main controller via the CAN bus.

[0035] Compared with the prior art, the advantages and beneficial effects of the battery pack physical location identification device and method and photovoltaic power station start-up addressing method of the present invention patent application are:

[0036] The battery pack physical location identification device and method of the present application simplifies the physical architecture for identifying the physical location of the battery pack and realizes automatic address allocation through a dedicated address bus. Compared with the traditional method of physical DIP switches or manual calibration of battery pack addresses, it has higher processing efficiency and handling reliability, and can effectively improve the installation efficiency of battery packs and even photovoltaic power stations.

[0037] Furthermore, a terminal matching resistor is provided in each battery pack. After all battery packs have completed physical position identification, the terminal matching resistor at the tail battery pack is closed through the CAN bus, thereby realizing automatic configuration of the matching resistor of the CAN bus and ensuring the reliability of CAN bus communication. There is no need for traditional manual installation of the last terminal matching resistor, making installation more efficient.

[0038] In addition, the photovoltaic power station start-up addressing method of the present application triggers the physical location identification of the battery pack when performing the start-up operation, realizes automatic power-on and location identification of the battery pack, reduces user operations at the start-up, and the physical location identification of the battery pack is performed in parallel with operations such as configuring the photovoltaic power station start-up parameters, which can effectively shorten the start-up time and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0040] FIG1 is a circuit structure block diagram of a device for identifying the physical position of a battery pack according to one embodiment of the present invention;

[0041] FIG2 is a circuit structure block diagram of a device for identifying the physical position of a battery pack according to another embodiment of the present invention;

[0042] 3 is a schematic diagram of the workflow of the main controller side of a method for identifying the physical position of a battery pack according to one embodiment of the present invention;

[0043] FIG4 is a schematic diagram of the inverter-side workflow of a method for identifying the physical position of a battery pack according to an embodiment of the present invention;

[0044] FIG5 is a schematic diagram of a battery pack side workflow of a method for identifying a physical position of a battery pack according to an embodiment of the present invention;

[0045] FIG6 is a schematic diagram of the working process of a photovoltaic power station start-up addressing method according to an embodiment of the present invention.

[0046] The reference numerals are as follows:

[0047] 1. Main controller, 2. Inverter, 31. First battery pack, 32. Second battery pack, 33. Third battery pack, 4. Battery controller, 51. First terminal matching resistor, 52. Second terminal matching resistor, 53. Electronically controlled switch. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0049] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] Example 1:

[0051] This embodiment describes a battery pack physical location identification device for a photovoltaic power station with a photovoltaic storage device. As shown in Figure 1, the energy storage device includes several battery packs, and the photovoltaic power station includes an inverter 2. The battery pack physical location identification device includes a main controller 1, wherein the battery packs are sequentially connected in parallel through power lines, and each battery pack is respectively provided with a battery controller 4 for performing information processing and control on the battery pack. The battery controllers 4 are communicatively connected to each other through a communication bus, and the digital interfaces of the battery controllers 4 are sequentially connected through address calibration lines; the inverter 2 is electrically connected to one of the several battery packs through a power line, and the inverter 2 is provided with an inverter controller, and the digital interface of the inverter controller is connected to the digital interface of the battery controller 4 of the battery pack connected to the inverter through an address calibration line; the main controller 1 is communicatively connected to the inverter controller and each battery controller 4 through a communication bus.

[0052] The main controller 1 can issue control instructions to the inverter 2 through the CAN bus. After processing the instructions, the inverter controller in the inverter 2 can issue instructions to the battery pack connected to it to start physical position identification, and then each battery pack completes the determination of its own physical position one by one.

[0053] As a preferred embodiment, the positive and negative poles of each battery pack are sequentially connected in parallel via power lines, and the digital interfaces of each battery pack are sequentially connected one by one via address calibration lines. The battery packs connected sequentially are arranged in an orderly string, and the battery pack at the end (head end) is connected to the digital interface of inverter 2 via address calibration lines. It should be noted that the digital interfaces are all digital interfaces of the inverter and the controller in each battery pack. For the sake of smooth explanation, this article may directly describe the digital interface of a certain unit. For example, the "digital interface of inverter 2" above refers to the digital interface of the inverter controller of inverter 2. Please be aware of this.

[0054] Specifically, the battery controller 4 provided in each of the battery packs has a group of digital interfaces, which are the digital interfaces of the battery controller 4 . Each group of digital interfaces includes a digital input interface and a digital output interface.

[0055] In order to facilitate the description of the battery pack physical position identification device, the battery pack 1 connected to the inverter 2 is named the first battery pack 31, the battery pack N at the tail end is named the second battery pack 32, and each of the battery packs (battery pack 2, battery pack 3, ... battery pack N-1) located between the first battery pack 31 and the second battery pack 32 is named the third battery pack 33, as shown in Figure 1. Figure 1 schematically illustrates a specific implementation of the present invention and does not limit the scope of protection of the present invention. N is a positive integer greater than or equal to. Specifically:

[0056] When the inverter 2 is connected to the digital interface of the first battery pack 31 at the head end, the digital output interface of the inverter 2 is connected to the digital input interface of the first battery pack 31 via the address calibration line;

[0057] When the digital interface of the first battery pack 31 is connected to the digital interface of the third battery pack 33, the digital output interface of the first battery pack 31 is connected to the digital input interface of the third battery pack 33 via the address calibration line;

[0058] When the third battery pack 33 is docked with the digital interface of the second battery pack 32 at the tail end, the digital output interface of the third battery pack 33 is connected to the digital input interface of the second battery pack 32 via the address calibration line;

[0059] When docking the digital interface of the third battery pack 33, the digital input interface of the third battery pack 33 is sequentially connected to the digital output interface of the previous battery pack through the address calibration line, and the digital output interface of the third battery pack 33 is sequentially connected to the digital input interface of the next battery pack through the address calibration line.

[0060] Typically, each battery pack is equipped with a controller unit, namely the aforementioned battery controller 4, which is provided with the aforementioned digital interface. As another embodiment, a separate controller can be provided in each battery pack for physical location identification processing, rather than using the aforementioned battery controller 4 for control processing within the battery pack. Applicants believe that whether utilizing the battery controller 4 within each battery pack or a separate controller for physical location identification processing is within the scope of protection of this application.

[0061] The communication bus is an RS485 bus or a CAN bus, and either one can be selected in the embodiment of the present invention. For the reliability of communication, terminal matching resistors are usually required to be respectively provided at the head end and the tail end of the communication bus.

[0062] In this embodiment, the CAN bus is used as an example. In CAN communication, matching resistors are typically located at both ends of the CAN bus, known as bus terminals, often referred to as terminal matching resistors. The purpose of the terminal matching resistors is to help reduce signal reflections and interference to ensure that the signal flows correctly through the CAN bus. Therefore, the first terminal matching resistor 51 at the head end of the CAN bus is located at the main controller 1 and is in a closed state, while the second terminal matching resistor 52 remains closed and is located in the battery pack at the tail end. Traditionally, the second terminal matching resistor 52 at the battery pack is manually installed at the end of the battery pack after physical location assignment is completed, and then closed to complete the reliable configuration of the CAN bus.

[0063] In one embodiment of the present application, a second terminal matching resistor 52 and an electronically controlled switch 53 are respectively configured in each battery pack. The terminal matching resistor 52 and the electronically controlled switch 53 are connected in series and then connected in parallel. When the physical position identification of the battery pack is completed, the position information is reported. At the same time, the battery pack at the tail end (the aforementioned second battery pack 32) closes the electronically controlled switch connected to the second terminal matching resistor 52 inside it, and connects the second terminal matching resistor 52 of the last battery pack to the tail end of the CAN bus. In this way, the correct configuration of the terminal matching resistor of the CAN bus is automatically completed, and reliable signal transmission of CAN bus communication is achieved.

[0064] In addition, the main controller 1 is connected to the starting switch provided in each of the battery packs through the auxiliary source control line. The main controller 1 is connected to each of the starting switches through the auxiliary source control line. The main controller 1 can issue control instructions to each battery pack through the auxiliary source control line, such as a black start signal, to complete the black start of the battery pack.

[0065] Example 2:

[0066] The overall architecture of the battery pack physical location identification device of this embodiment is improved on the basis of Example 1. The improvement is that there is no need to set up a separate main controller. Instead, the inverter controller in inverter 2 is used to issue control instructions and physical location initial identification instructions, thereby simplifying the overall architecture. In other words, the inverter controller is connected to each battery controller 4 via a communication bus, and the first terminal matching resistor 51 is located in the inverter 2. In addition, the inverter 2 is connected to the starting switch provided in each battery pack via an auxiliary source control line. The inverter 2 is connected to each starting switch via an auxiliary source control line. The inverter 2 can issue control instructions to each battery pack via the auxiliary source control line, such as a black start signal, to complete the black start startup of the battery pack.

[0067] Example 3:

[0068] This embodiment describes a method for identifying the physical location of a battery pack, based on the device for identifying the physical location of a battery pack as described in Embodiment 1 or Embodiment 2, and includes the following steps:

[0069] Step S1: The main controller 1 sends a start device search instruction to the inverter 2;

[0070] Step S2: After receiving the device search instruction, the inverter 2 sends a physical location initial identification signal to the first battery pack 31 connected thereto;

[0071] Step S3: the first battery pack 31 determines an initial position according to the physical position initial identification signal sent by the inverter 2, and sends a physical position intermediate identification signal to the third battery pack 33 connected thereto;

[0072] Step S4: The third battery pack 33 determines its own physical position based on the physical position intermediate identification signal, and the third battery pack 33 continues to send the physical position intermediate identification signal to another battery pack connected to it, and determines the physical position of the battery pack in turn until the search reaches the battery pack at the tail end (i.e., the second battery pack 32), completing the physical position identification of all battery packs.

[0073] The following specifically describes the processing logic of the main controller 1 side, the inverter 2 side, and the battery pack side during the battery pack physical location identification method:

[0074] On the main controller 1 side, as shown in Figure 3, upon receiving a startup device search command from the outside, the main controller 1 immediately issues a startup device search command to the inverter 2 and sends a black start signal to the battery pack via the auxiliary power control line. Upon receiving the black start signal, the start switch in the battery pack closes, completing the battery pack startup. The battery pack black start can be initiated by a command issued by the main controller 1 or manually controlled on-site. This can be adjusted according to specific circumstances, and the physical identification of the battery pack continues when the battery pack is powered on. After sending the battery pack black start signal, the black start signal is turned off after maintaining T1 time to ensure the successful sending of the black start signal and to ensure that each battery pack can be successfully turned on. However, T1 cannot be set too long to prevent the battery pack from being unable to enter the dormant state due to a long hard start, resulting in the battery pack being out of power. After T2 time, it is determined whether the device search is completed. The determination of whether the device search is completed is based on the feedback of the battery pack on its physical location, thereby completing the number of battery packs and the completion rate detection of physical location identification. If it is determined that the search is not completed, it is continued to determine whether T3 time has been reached. If T3 time has been reached, the device search is ended, that is, the physical location identification of the battery pack is ended. If T3 time has not been reached, it returns to the step of determining whether the device search is completed. T3 is a timeout setting to ensure the maximum time that the physical location can be completed normally, to prevent the inability to exit the physical location identification state and affect the subsequent site opening process.

[0075] Regarding the settings of T1, T2, and T3, the timing of these three times starts from the same etching start, and the starting time is from the receipt of the start device search instruction. Generally, it is set to T1 < T2 < T3. In this embodiment, T1 is set to 5 seconds, T2 is set to 30 seconds, and T1 is set to 60 seconds.

[0076] The process of battery packs reporting their physical locations involves the main controller assigning a virtual address to each battery pack via a communication bus. The main controller then maintains communication with the battery packs that have completed the virtual address assignment to obtain the number of battery packs, thereby completing battery pack counts. Battery packs that have received a virtual address report their current physical location via the communication bus. If a battery pack has not yet been assigned a physical location, an invalid physical location is returned to monitor the completion rate of the battery pack's physical location identification.

[0077] On the inverter 2 side, as shown in Figure 4, after receiving the start device search instruction issued by the main controller 1, the inverter 2 sends a physical position initial identification signal to the first battery pack 31 connected to it, starts the physical position identification action of the battery pack, and then each battery pack identifies and determines its own physical position one by one. After each battery pack determines its own position, it will not only continue to send a physical position intermediate identification signal downward, but also upload its own physical position back to the inverter 2 one by one. The inverter 2 counts the number of battery packs that have completed physical position identification. When the battery pack requirements of the photovoltaic power station are met, it indicates that the physical position identification is completed. The inverter 2 reports the completion of physical position identification to the main controller 1 through the CAN bus, and at the same time reports the physical position of each battery pack and the number of battery packs.

[0078] On the battery pack side, as shown in Figure 5, after the battery pack receives the black start signal sent by the main controller 1 through the auxiliary source control line, it automatically completes the startup and initialization of the battery pack, completes the power-on of the battery pack, and then waits to receive the physical position initial identification signal of the inverter 2 connected to it or the physical position intermediate identification signal of the previous battery pack, and determines its own physical position based on the received position identification data identifier, and in this process feeds back the position identification data to the inverter 2 to determine whether the position identification is completed. If not, the physical position intermediate identification signal continues to be sent downward until it is determined that the position identification is completed and the physical position of the last battery pack, that is, the physical position of the second battery pack 32, is determined.

[0079] In one embodiment, the battery pack physical position identification method also includes step S5: after all battery packs complete physical position identification, the main controller 1 sends a terminal resistance closing trigger signal to the battery pack that last confirms its physical position through the CAN bus. The battery pack that last confirms its physical position closes the electric control switch connected to the terminal matching resistor in the battery pack upon receiving the terminal resistance closing trigger signal, and connects the terminal matching resistor in the second battery pack 32 to the CAN bus, thereby automatically completing the correct configuration of the terminal matching resistor of the CAN bus and realizing reliable signal transmission of CAN bus communication.

[0080] The physical location intermediate identification signal is a square wave signal, and the battery pack determines its physical location based on the duty cycle of the received physical location intermediate identification signal. In other words, the duty cycle of the signal transmitted each time the physical location intermediate identification signal is transmitted again by a battery pack changes proportionally. For example, in a photovoltaic power station with four battery packs, including a first battery pack 31, a second battery pack 32, and two third battery packs 33 located between the first battery pack 31 and the second battery pack 32, the duty cycle of the physical position intermediate identification signal sent by the first battery pack 31 to the third battery pack 33 connected to it is 5%, the duty cycle of the physical position intermediate identification signal sent by this third battery pack 33 to another third battery pack 33 connected to it is 15%, and the duty cycle of the physical position intermediate identification signal sent by another third battery pack 33 to the second battery pack 32 connected to it is 25%. As for the physical position intermediate identification signal output by the second battery pack 32 at the final end, the duty cycle is 35%, and the second battery pack 32 feeds back the physical position intermediate identification signal with a duty cycle of 35% to the inverter 2. It can be concluded that the second battery pack 32 is the last battery pack, and the battery pack position identification is completed.

[0081] The physical location intermediate identification signal is a square wave signal, and the battery pack determines its own physical location based on the frequency of the received physical location intermediate identification signal. In other words, the frequency of the signal sent by each battery pack changes proportionally with each subsequent physical location intermediate identification signal sent. For example, in a photovoltaic power station with four battery packs, including a first battery pack 31, a second battery pack 32, and two third battery packs 33 located between the first battery pack 31 and the second battery pack 32, the frequency of the physical position intermediate identification signal sent by the first battery pack 31 to the third battery pack 33 connected to it is 6Hz, the frequency of the physical position intermediate identification signal sent by this third battery pack 33 to another third battery pack 33 connected to it is 8Hz, and the frequency of the physical position intermediate identification signal sent by another third battery pack 33 to the second battery pack 32 connected to it is 10Hz. As for the final tail end, the frequency of the physical position intermediate identification signal output by the second battery pack 32 is 12Hz, and the second battery pack 32 feeds back the physical position intermediate identification signal with a frequency of 12Hz to the inverter 2. It can be concluded that the second battery pack 32 is the last battery pack, and the battery pack position identification is completed.

[0082] The battery pack physical location identification device and method of this embodiment simplifies the physical architecture for identifying the physical location of the battery pack, and realizes automatic address allocation through a dedicated address bus. Compared with the traditional method of physical DIP switches or manual calibration of battery pack addresses, it has higher processing efficiency and handling reliability, and can effectively improve the installation efficiency of battery packs and even photovoltaic power stations.

[0083] Example 4:

[0084] This embodiment describes a photovoltaic power station start-up addressing method, which optimizes and improves the previous embodiments. As shown in Figure 6, the optimization is as follows: the start-up time of the photovoltaic power station is shortened. The photovoltaic power station start-up command and start-up configuration are issued through the APP terminal. Specifically, when the start-up command is issued, the APP terminal automatically sends a device search start instruction to the main controller 1, and the main controller 1 monitors the completion of the device search until the device search is completed. When the user sets the basic parameters for photovoltaic power station start-up through the APP terminal, the physical location of the battery pack is automatically searched and determined. The search and determination process of the battery pack physical location adopts the battery pack physical location identification method described in Example 3.

[0085] The photovoltaic power station start-up addressing method of this embodiment triggers the physical location identification of the battery pack when performing the station start-up operation, realizes automatic power-on and location identification of the battery pack, reduces the user operation of the start-up, and performs the physical location identification of the battery pack in parallel with the photovoltaic power station configuration parameters and other operations, which can effectively shorten the station start-up time and improve the user experience.

[0086] In one embodiment, after the search and determination of the physical location of the battery pack is completed, the physical location of each battery pack is reported to the main controller 1 via the CAN bus, and then fed back by the main controller 1 to the cloud or directly sent to the APP terminal.

[0087] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack physical location identification device, used in a photovoltaic power station with energy storage equipment, characterized in that: The energy storage device includes a plurality of battery packs, the photovoltaic power station includes an inverter, and the battery pack physical location identification device includes a main controller, wherein: The battery packs are electrically connected to the inverter via power lines, and the battery packs are connected to the inverter via address calibration lines, which are used to transmit physical location identification signals. The main controller is communicatively connected to the inverter and each battery pack via a communication bus.

2. The battery pack physical position identification device according to claim 1, characterized in that: The battery packs are sequentially connected in parallel via power lines, and the address configuration interfaces of the battery packs are sequentially connected one by one via address calibration lines.

3. The battery pack physical position identification device according to claim 2, characterized in that: The battery packs are sequentially connected in parallel via power lines, a battery controller is provided in each battery pack, and digital interfaces of the battery controllers are sequentially connected via address calibration lines.

4. The battery pack physical position identification device according to claim 3, characterized in that: The inverter is electrically connected to at least one of the plurality of battery packs via a power line. The inverter has an inverter controller, and a digital interface of the inverter controller is connected to a digital interface of the battery pack connected to the inverter via an address calibration line.

5. The battery pack physical position identification device according to claim 4, characterized in that: The main controller is connected to the inverter controller and each battery controller through a communication bus.

6. The battery pack physical position identification device according to claim 5, characterized in that: The battery controller has at least one set of digital interfaces, and the digital interfaces of the two battery controllers are connected through the address calibration line, so as to connect the plurality of battery packs in sequence.

7. The battery pack physical position identification device according to claim 6, characterized in that: Among the plurality of battery packs connected in sequence, the digital input interface of the battery controller of the battery pack located at the end is connected to the digital output interface of the inverter through the address calibration line.

8. The battery pack physical position identification device according to claim 6 or 7, characterized in that: Each group of digital interfaces includes a digital input interface and a digital output interface. Among the battery packs connected in sequence, the digital input interface of one battery pack is connected to the digital output interface of the previous battery pack through an address calibration line, and the digital output interface of one battery pack is connected to the digital input interface of the next battery pack through an address calibration line.

9. The battery pack physical position identification device according to claim 1, characterized in that: Each battery pack is respectively provided with a terminal matching resistor and an electric control switch. The terminal matching resistor and the electric control switch are connected in series and then connected in parallel to the communication bus.

10. The battery pack physical position identification device according to claim 1, characterized in that: An electrically controllable start switch is provided in each of the battery packs, and the main controller is connected to each of the start switches via an auxiliary source control line, so as to start the battery pack.

11. The battery pack physical position identification device according to claim 1, characterized in that: The main controller is an inverter controller of an inverter, and the inverter controller is connected to each battery controller through a communication bus.

12. The battery pack physical position identification device according to claim 1, characterized in that: The communication bus is an RS485 bus or a CAN bus.

13. A method for identifying the physical position of a battery pack, based on the physical position identification device of a battery pack according to any one of claims 1 to 12, characterized in that: The steps include: Step S1: The main controller sends a startup device search instruction to the inverter; Step S2: after receiving the device search instruction, the inverter sends a physical location initial identification signal to the nth battery pack connected thereto; Step S3: the nth battery pack determines an initial position according to the physical position initial identification signal sent by the inverter, and sends a physical position intermediate identification signal to the (n+1)th battery pack connected thereto; Step S4: The (n+1)th battery pack connected to the nth battery pack determines its own physical position based on the physical position intermediate identification signal, and the (n+1)th battery pack continues to send a physical position intermediate identification signal to the (n+2)th battery pack connected to it to determine the physical position of the (n+2)th battery pack, where n is an integer greater than or equal to 1.

14. The method for identifying the physical position of a battery pack according to claim 13, characterized in that: The step S5 is also included: After all battery packs complete physical position identification, the main controller sends a terminal resistance closing trigger signal to the battery pack that last confirmed its physical position through the communication bus. The battery pack that last confirmed its physical position closes the electronic control switch in the battery pack upon receiving the terminal resistance closing trigger signal, and the communication bus is connected to the terminal matching resistor at the tail end.

15. The method for identifying the physical position of a battery pack according to claim 13, characterized in that: The terminal matching resistor at the head end of the communication bus is located in the main controller.

16. The method for identifying the physical position of a battery pack according to claim 13, characterized in that: In step S1, the main controller also sends a black start signal to the start switch in the battery pack through the auxiliary source control line. After receiving the black start signal, the start switch in the battery pack closes the power supply of the battery controller to complete the startup of the battery pack.

17. The method for identifying the physical position of a battery pack according to claim 13, characterized in that: The main controller allocates a virtual address to each battery pack via a communication bus, and the main controller maintains communication with the battery packs to which the virtual address allocation is completed, so as to obtain the number of battery packs.

18. The method for identifying the physical position of a battery pack according to claim 17, characterized in that: The battery pack that has obtained the virtual address feeds back its current physical location through the communication bus. If the battery pack has not yet been assigned a physical location, an invalid physical location is fed back to detect the completion rate of the physical location identification of the battery pack.

19. The method for identifying the physical position of a battery pack according to claim 13, characterized in that: The physical position intermediate identification signal is a square wave signal, and the battery pack determines its own physical position according to the frequency or duty cycle of the received physical position intermediate identification signal.

20. A photovoltaic power station addressing method, which issues photovoltaic station opening instructions and performs station opening configuration through a terminal, characterized in that: When the station opening instruction is issued, the physical position of the battery pack is automatically searched and determined. The process of searching and determining the physical position of the battery pack adopts the battery pack physical position identification method as described in any one of claims 13 to 19.

21. The photovoltaic power station addressing method according to claim 20, characterized in that: After the search and determination of the physical location of the battery pack is completed, the physical location of each battery pack is reported to the main controller via the CAN bus.

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