Energy storage system, power conversion device, battery device and communication method

Abstract

The invention relates to an energy storage system, a power conversion device, a battery device and a communication method, and the energy storage system comprises the power conversion device and the battery device, and the power conversion device and the battery device are connected through a power line. The power conversion device comprises a control unit and a first transmit-receive unit. The battery device comprises a battery management unit and a second transceiving unit; the first transceiving unit modulates the control information into a first communication signal, sends the first communication signal to the battery device through the power line, receives a second communication signal through the power line, and demodulates the second communication signal to obtain battery information; and the second transceiving unit modulates the battery information output by the battery management unit into a second communication signal, sends the second communication signal to the power conversion device through the power line, receives the first communication signal through the power line, and demodulates the first communication signal to obtain control information. The problem of wiring errors of the power conversion device and the battery device can be reduced, and material diversity can be reduced.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage system, a power conversion device, a battery device and a communication method. Background Art

[0002] In a photovoltaic energy storage system, power lines and communication lines are required to connect multiple battery clusters to the energy storage inverter. Due to factors in the on-site installation environment, wiring errors may occur, resulting in operational failures of the photovoltaic energy storage system. In related technologies, in order to solve the problem of wiring errors, one solution is to use physical anti-mistakes, such as making the ports for communication lines and power lines into anti-mistake ports. Another solution is to use software to detect and determine the pairing relationship between the power line and the communication line.

[0003] However, in the above-mentioned related technologies, the physical anti-mistake solution will increase the material diversity and is not suitable for situations with high installation requirements. The software detection solution has problems such as long detection time and many detection blind spots because the pairing relationship between the power line and the communication line needs to be updated in real time when an error occurs. Summary of the invention

[0004] In view of the above, it is necessary to provide an energy storage system, a power conversion device, a battery device and a communication method, which can reduce the problem of wiring errors between the power conversion device and the battery device and reduce material diversity.

[0005] On the one hand, the present application provides an energy storage system, including: a power conversion device and at least one battery device, the power conversion device is used to convert electric energy, the battery device is used to store electric energy, the power conversion device and each battery device are connected through a corresponding power line, and the power conversion device supplies power to the battery device through the power line; the power conversion device includes a control unit and a first transceiver unit, the control unit is connected to the first transceiver unit, and the first transceiver unit is connected to the power line; the battery device includes a battery management unit and a second transceiver unit, the battery management unit is connected to the second transceiver unit, and the second transceiver unit is connected to the power line; wherein the first transceiver unit is used to modulate the control information output by the control unit into a first communication signal, and send the first communication signal to the battery device through the power line, and is used to receive the second communication signal of the battery device through the power line, and demodulate the battery information according to the second communication signal; the second transceiver unit is used to modulate the battery information output by the battery management unit into a second communication signal, and send the second communication signal to the power conversion device through the power line, and is used to receive the first communication signal of the power conversion device through the power line, and demodulate the control information according to the first communication signal.

[0006] In some embodiments, the power conversion device further includes a pre-charging circuit, the pre-charging circuit is connected to the power line and the control unit, and the pre-charging circuit is used to pre-charge the battery device before the power conversion device supplies power to the battery device; The first transceiver unit includes a first coupling sensor, which is arranged on a power line between the pre-charging circuit and the battery device, and is used for sending a first communication signal and for receiving a second communication signal.

[0007] In some embodiments, the battery device also includes a switching unit, which is connected to the power line and the battery management unit, and is used to control the connection status of the power line and the battery management unit; the second transceiver unit includes a second coupling sensor, which is arranged on the power line between the switch unit and the power conversion device, and the second coupling sensor is used to send a second communication signal and to receive a first communication signal.

[0008] In some embodiments, the control unit is also used to collect electrical data of the power line, and generate multiple associated information based on the electrical data and battery information obtained by demodulating the second communication signal; the electrical data of the power line includes the voltage and / or current of the power line, and the associated information is used to indicate the associated relationship between the power line and the battery device.

[0009] In some embodiments, the power conversion device further includes a power conversion circuit, which is used to convert the power and / or the form of the electrical energy. The control unit controls the power conversion circuit to supply power to the associated battery device based on the associated information.

[0010] On the other hand, the present application provides a power conversion device, including: a power conversion device for converting electric energy, the power conversion device and at least one battery device are connected via a power line, the power conversion device supplies power to the battery device via the power line, and the battery device is used to store electric energy; the power conversion device includes: a control unit and a first transceiver unit, the control unit is connected to the first transceiver unit, and the first transceiver unit is connected to the power line; wherein the first transceiver unit is used to modulate control information output by the control unit into a first communication signal, and send the first communication signal to the battery device via the power line, and / or, to receive a second communication signal from the battery device via the power line, and demodulate the second communication signal to obtain battery information.

[0011] In some embodiments, the power conversion device also includes a pre-charging circuit, which is connected in parallel to the power line, and the pre-charging circuit is used to pre-charge the battery device before the power conversion device supplies power to the battery device; the first transceiver unit includes a first coupling sensor, which is arranged between the pre-charging circuit and the battery device, and the first coupling sensor is used to send a first communication signal and to receive a second communication signal.

[0012] On the other hand, the present application also provides a battery device, including: a battery device for storing electric energy, at least one battery device and a power conversion device are connected via a power line, the power conversion device supplies power to the battery device via the power line, and the power conversion device is used to convert electric energy; the battery device includes: a battery management unit and a second transceiver unit, the battery management unit is connected to the second transceiver unit, and the second transceiver unit is connected to the power line; wherein the second transceiver unit is used to modulate the battery information output by the battery management unit into a second communication signal, and send the second communication signal to the power conversion device via the power line, and / or, is used to receive a first communication signal from the power conversion device via the power line, and demodulate the control information according to the first communication signal.

[0013] In some embodiments, the battery device is also provided with a switch unit, which is arranged between the power line and the battery device and is used to control the connection status of the power line and the battery device; the second transceiver unit includes a second coupling sensor, which is arranged between the switch unit and the power conversion device, and the second coupling sensor is used to send a second communication signal and to receive a first communication signal.

[0014] The last aspect of the present application provides a communication method, which is applied to an energy storage system, wherein the energy storage system includes a power conversion device and at least one battery device, wherein the power conversion device is connected to each battery device through a corresponding power line, and comprises: the power conversion device modulates control information into a first communication signal, and sends the first communication signal to the battery device through the power line, and receives a second communication signal from the battery device through the power line, and demodulates the battery information according to the second communication signal; and the battery device modulates the battery information into a second communication signal, and sends the second communication signal to the power conversion device through the power line, and receives the first communication signal from the power conversion device through the power line, and demodulates the control information according to the first communication signal; the power conversion device collects electrical data of the power line, and associates the electrical data with the battery information obtained by demodulating the second communication signal to generate multiple associated information, wherein the electrical data of the power line includes the voltage and / or current of the power line, and the associated information is used to indicate the associated relationship between the power line and the battery device; the power conversion device generates control information based on the associated information.

[0015] Compared with the prior art, this application has at least the following advantages: 1. In the present application, the power conversion device and the battery device are connected through a power line and communicate through the power line in a power carrier communication mode. Since only the power line needs to be installed, the information used to control the charging of the battery device (such as battery information and control information) can be coupled to the power line for transmission. Therefore, the information used to control the charging of the battery device forms a unique correspondence with the power line, and there is no need to install a communication line. The problem of wiring errors between the power conversion device and the battery device can be reduced, and compared with the traditional physical fool-proofing method, the material diversity can also be reduced.

[0016] 2. In the present application, the first coupling sensor is arranged on the power line between the pre-charging circuit and the battery device, that is, the first coupling sensor is arranged outside the internal circuit of the power conversion device, close to one side of the battery device, thereby reducing the high-frequency interference during the operation of the internal circuit of the power conversion device, thereby reducing the impact on the signal quality of the first communication signal or the second communication signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a wiring diagram of an energy storage converter and a battery cluster in the related art.

[0018] Figure 2 This is a schematic diagram of incorrect wiring between an energy storage inverter and a battery cluster in the related art.

[0019] Figure 3 This is another schematic diagram of incorrect wiring between an energy storage inverter and a battery cluster in the related art.

[0020] Figure 4 It is a schematic diagram of the structure and connection relationship of an embodiment of the energy storage system of the embodiment of the present application.

[0021] Figure 5 It is a schematic diagram of the structure and connection relationship of another embodiment of the energy storage system of the embodiment of the present application.

[0022] Figure 6 It is a schematic diagram of a communication method of an energy storage system according to an embodiment of the present application.

[0023] Description of main component symbols: 1. Energy storage inverter; 2. Battery cluster; 20. Energy storage system; 21. Power conversion device; 211. Control unit; 212. First transceiver unit; 22. Battery device; 221. Battery management unit; 222. Second transceiver unit; 213. Pre-charging circuit; 214. Power conversion circuit; 2121. First coupling sensor; 2111. Sampling end; 2221. Second coupling sensor; 23. Power line.

[0024] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0025] In the description of the embodiments of the present application, words such as "exemplary", "or", "for example" and the like are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "or", "for example" and the like is intended to present related concepts in a concrete manner.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field in this application. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. It should be understood that, unless otherwise specified in this application, " / " means or. For example, A / B can represent A or B. "And / or" in this application is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. "At least one" means one or more. "Multiple" means two or more than two. For example, at least one of a, b or c can represent: a, b, c, a and b, a and c, b and c, a, b and c seven situations.

[0027] It should also be noted that the terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish similar objects rather than to describe a specific order or sequence.

[0028] Figure 1 It is a wiring diagram of an energy storage converter 1 and a battery cluster 2 in the related art. Figure 2 This is a schematic diagram of incorrect wiring between an energy storage converter 1 and a battery cluster 2 in the related art. Figure 3 This is another schematic diagram of incorrect wiring between the energy storage converter 1 and the battery cluster 2 in the related art.

[0029] In energy storage systems, such as photovoltaic energy storage systems, in order to meet users' long-term backup power and power expansion needs, a PCS (Power Conversion System, bidirectional energy storage converter) is often used to connect more than one battery cluster 2, such as Figure 1 As shown, taking two battery clusters 2 as an example, the connection between the energy storage inverter 1 and one battery cluster 2 and another battery cluster 2 usually requires power lines and communication lines, wherein the power line is used to transmit power and the communication line is used to transmit data information. When installing the PCS and the battery cluster 2, due to factors such as the large number of battery clusters 2 to be installed or the careless installation, Figure 2As shown, it is possible that the power line of a battery cluster 2 is installed crosswise with the power line of another battery cluster 2 to the energy storage converter 1, or Figure 3 As shown, there may be a situation where the communication line of a battery cluster 2 is installed crosswise with the communication line of another battery cluster 2 in the energy storage inverter 1, which may cause the energy storage inverter 1 to make an error in identifying battery information, and further cause an operation failure of overcharging of a battery cluster 2 or another battery cluster 2. It should be noted that the power line is usually composed of a positive and negative line. In other scenarios such as three-phase power supply, it can also be a combination of 3 or 4 lines. In order to facilitate the distinction between power lines and communication lines, the drawings of the embodiments of the present application use one line as an illustration.

[0030] In the related art, in order to solve the above installation problem, one solution is to use physical anti-mute, such as making the ports for the communication line and the power line into anti-mute ports, or making the communication line and the power line into anti-mute long and short lines. Another solution is to use software for detection, specifically: first wake up each battery cluster 2 separately, then detect the voltage of each port of the PCS, and finally the software layer determines the pairing relationship between the power line and the communication line.

[0031] However, in the above-mentioned related technologies, the physical anti-mistake solution will increase the material diversity and is not suitable for situations with high installation requirements, such as a large number of battery clusters 2 installed, a long installation distance, or a high installation height. The software detection solution has problems such as long detection time and many detection blind spots because the pairing relationship between the power line and the communication line needs to be updated in real time when an error occurs.

[0032] To this end, the embodiments of the present application provide an energy storage system, a power conversion device, a battery device and a communication method, which can reduce the problem of incorrect wiring between the power conversion device and the battery device, and can reduce material diversity.

[0033] Figure 4 It is a schematic diagram of the structure and connection relationship of an embodiment of the energy storage system 20 of the embodiment of the present application.

[0034] See also Figure 4 As shown, the embodiment of the present application first provides an energy storage system 20. The energy storage system 20 may be a photovoltaic energy storage system, a wind power generation energy storage system, a hydropower generation energy storage system or a geothermal power generation energy storage system.

[0035] The energy storage system 20 may include a power conversion device 21 and a battery device 22. The power conversion device 21 and the battery device 22 are connected via a power line 23.

[0036] The battery device 22 can be used to store electrical energy. The battery device 22 can include a battery module 224 (see Figure 5As shown in FIG. 1 ), the battery module 224 may be one of the electric energy storage devices such as a battery cell, a storage battery or a battery cluster 2. The number of battery devices 22 may be N, where N is a positive integer, such as 1, 2, 3, 4, etc. All embodiments of the present application take 2 as an example to illustrate the improvement of the present application. Corresponding to the number of battery devices 22, the number of power lines 23 may be N.

[0037] The power conversion device 21 can be used to convert electric energy and provide the converted electric energy to the battery device 22. The power conversion device 21 can supply power (i.e., charge) to the battery device 22 through the power line 23. Moreover, the power conversion device 21 can also control the discharge of the battery device 22 through the power line 23 to supply power to the load.

[0038] In some embodiments, the power conversion device 21 may have at least one of the functions of rectification, inversion or power conversion. For example, when the power conversion device 21 may be a bidirectional energy storage inverter, it may have an inversion function, which can be used to control the discharge of the battery device 22 to directly power the AC load when there is no power grid.

[0039] Specifically, in the embodiment of the present application, the power conversion device 21 can communicate with the battery device 22 through the power line 23, and the communication method can be a power line communication (Power Line Communication, PLC, also known as "power line communication" or "power line 23 communication") method, that is, the power conversion device 21 can supply power to the battery device 22 through the power line 23, and exchange information with the battery device 22 through the power line 23 during the power supply process. In this way, the power conversion device 21 can accurately supply power and precisely control the battery device 22. Therefore, in the case where only the power line 23 needs to be installed, the data information (such as battery information and control information) used to control the charging of the battery device 22 can be coupled to the power line 23 for transmission. As a result, the information used to control the charging of the battery device 22 forms a unique correspondence with the power line 23, and there is no need to install a communication line, which can reduce the problem of incorrect wiring between the power conversion device 21 and the battery device 22, and compared with the traditional physical fool-proofing method, it can also reduce material diversity.

[0040] Further, such as Figure 4 As shown, the power conversion device 21 of the embodiment of the present application may include a control unit 211 and a first transceiver unit 212. The control unit 211 may be connected to the first transceiver unit 212, and the first transceiver unit 212 may be connected to the power line 23. Corresponding to the number of battery devices 22, the number of first transceiver units 212 may be N.

[0041] Among them, the first transceiver unit 212 can be used to modulate the control information output by the control unit 211 into a first communication signal, and send the first communication signal to the battery device 22 through the power line 23. The first transceiver unit 212 can also be used to receive a second communication signal of the battery device 22 through the power line 23, and demodulate the second communication signal to obtain battery information. In this case, the control information of the control unit 211 can be coupled to the power line 23 by the first transceiver unit 212 and then transmitted to the battery device 22, so that the charging of the battery device 22 can be controlled based on the control information. Similarly, the battery information is coupled to the power line 23 and then demodulated by the first transceiver unit 212, so that the control unit 211 can accurately obtain the battery information of the battery device 22, thereby further outputting more accurate control information to control the charging of the battery device 22.

[0042] In some embodiments, the first transceiver unit 212 may first modulate and send the first communication signal, and then receive and demodulate the second communication signal. In some embodiments, the first transceiver unit 212 may also first receive and demodulate the second communication signal, and then modulate and send the first communication signal. In some embodiments, the first transceiver unit 212 may also modulate and send the first communication signal, and simultaneously receive and demodulate the second communication signal, and may perform the operations of modulation, transmission, reception, and demodulation in a cycle. That is, the order in which the first transceiver unit 212 modulates and demodulates the data information may not be limited.

[0043] It can be understood that the first communication signal and the second communication signal can be carrier signals in power line carrier communication. In power line carrier communication, data information is coupled to the power line 23 by carrier wave mode for transmission.

[0044] In some embodiments, the control unit 211 may be a microcontroller unit (MCU), a central processing unit (CPU) or other units with control functions, etc. The control unit 211 may be used for energy management, that is, the control unit 211 may serve as an energy management system (EMS).

[0045] As mentioned above, the battery device 22 may be N in number, such as Figure 4 One battery device 22 and another battery device 22 in the embodiment may have the same structure and type as that of the one battery device 22 and another battery device 22 .

[0046] like Figure 4As shown, the battery device 22 of the embodiment of the present application may include a battery management unit 221 and a second transceiver unit 222. The battery management unit 221 is connected to the second transceiver unit 222, and the second transceiver unit 222 is connected to the power line 23.

[0047] The second transceiver unit 222 can be used to modulate the battery information output by the battery management unit 221 into a second communication signal, and send the second communication signal to the power conversion device 21 through the power line 23. The second transceiver unit 222 can also be used to receive the first communication signal of the power conversion device 21 through the power line 23, and demodulate the first communication signal to obtain control information.

[0048] In some embodiments, the second transceiver unit 222 may first modulate and send the second communication signal, and then receive and demodulate the first communication signal. In some embodiments, the second transceiver unit 222 may also first receive and demodulate the first communication signal, and then modulate and send the second communication signal. In some embodiments, the second transceiver unit 222 may also modulate and send the second communication signal, and simultaneously receive and demodulate the first communication signal, and may cyclically perform the operations of modulation, transmission, reception, and demodulation. That is, the order in which the second transceiver unit 222 modulates and demodulates the data information may also be not limited.

[0049] In some embodiments, the control information may be used to control the charging and discharging of the battery device 22. For example, the control information may include controlling the input voltage (or current), output voltage, or switching of the battery device 22.

[0050] In some embodiments, the battery information may include the state of charge (SOC, i.e., the remaining battery power), terminal voltage, temperature, charge and discharge current, and total voltage of the battery pack of the battery device 22, and the control unit 211 may generate more accurate control information based on the battery information to control the charge and discharge of the battery device 22. For example, the battery information of a certain battery device 22 may include the state of charge, terminal voltage, temperature, charge and discharge current, and total voltage of the battery pack of the certain battery device 22, and the battery information of another battery device 22 may include the state of charge, terminal voltage, temperature, charge and discharge current, and total voltage of the battery pack. The control unit 211 may generate more accurate control information based on the battery information of a certain battery device 22 to control the charge and discharge of the certain battery device 22, or generate more accurate control information based on the battery information of another battery device 22 to control the charge and discharge of another battery device 22.

[0051] In some embodiments, the battery management unit 221 may be used to manage battery power, that is, the battery management unit 221 may serve as a battery management system (BMS).

[0052] Figure 5 It is a schematic diagram of the structure and connection relationship of another embodiment of the energy storage system 20 of the embodiment of the present application.

[0053] like Figure 5 As shown, in some embodiments, the power conversion device 21 may further include a pre-charging circuit 213. The pre-charging circuit 213 is connected to the power line 23 and the control unit 211, and the pre-charging circuit 213 may be used to pre-charge the battery device 22 before the power conversion device 21 supplies power to the battery device 22. Corresponding to the number of battery devices 22, the pre-charging circuit 213 may be N. Thus, the situation in which the components are damaged due to over-powering when the power conversion device 21 directly supplies power to the battery device 22 can be reduced.

[0054] like Figure 5 As shown, in some embodiments, the control unit 211 may include a sampling terminal 2111, and the sampling terminal 2111 may be used to collect electrical data of the power line 23. Corresponding to the number of battery devices 22, the sampling terminals 2111 may be N. The control unit 211 may generate a plurality of associated information based on the electrical data collected by the sampling terminal 2111 and the battery information obtained by demodulating the second communication signal.

[0055] In some embodiments, the electrical data of the power line 23 may include a voltage and / or a current of the power line 23 .

[0056] In some embodiments, the association information can be used to indicate the association relationship between the power line 23 and the battery device 22. Therefore, based on the association information, the control unit 211 of the power conversion device 21 can also accurately identify and control the battery device 22 in the case of simplified on-site installation. For example, one battery device 22 corresponds to the first power line 23, and another battery device 22 corresponds to the second power line 23. Even if the power line 23 of one battery device 22 is connected to the power line 23 of another battery device 22 by mistake, the control unit 211 can also determine the controlled battery device 22 based on the association information and generate control information accordingly.

[0057] like Figure 5 As shown, in some embodiments, the power conversion device 21 may further include a power conversion circuit 214, which is used to convert the power of the electric energy and / or the form of the electric energy. Corresponding to the number of battery devices 22, the power conversion circuit 214 may be N. The control unit 211 may control the power conversion circuit 214 to supply power to the associated battery device 22 based on the associated information.

[0058] like Figure 5As shown, the first transceiver unit 212 may include a first coupling sensor 2121, and the first coupling sensor 2121 is arranged on the power line 23 between the pre-charging circuit 213 and the battery device 22. The first coupling sensor 2121 is used to send a first communication signal and to receive a second communication signal. Corresponding to the number of the first transceiver units 212, the first coupling sensors 2121 may be N. In this case, the first coupling sensor 2121 is equivalent to being arranged outside the internal circuit of the power conversion device 21, close to the side of the battery device 22, thereby reducing the high-frequency interference when the internal circuit of the power conversion device 21 is running, thereby reducing the signal quality affecting the first communication signal or the second communication signal.

[0059] In some embodiments, the first coupling sensor 2121 may be one of an inductor, a capacitor, or an electromagnetic coupler.

[0060] like Figure 5 As shown, in some embodiments, the battery device 22 may further include a switch unit 223, the switch unit 223 is connected to the power line 23 and the battery management unit 221, and the switch unit 223 is used to control the connection state between the power line 23 and the battery management unit 221. Thus, electric energy can be obtained from the power line 23 or released into the power line 23 by controlling the opening and closing of the switch unit 223.

[0061] like Figure 5 As shown, the second transceiver unit 222 may include a second coupling sensor 2221, and the second coupling sensor 2221 is arranged on the power line 23 between the switch unit 223 and the power conversion device 21. The second coupling sensor 2221 is used to send the second communication signal and to receive the first communication signal. In this case, the second coupling sensor 2221 is equivalent to being arranged at the rear stage of the switch unit 223 of the battery device 22, close to the side of the power conversion device 21.

[0062] In some embodiments, the second coupling sensor 2221 may be one of an inductor, a capacitor, or an electromagnetic coupler.

[0063] The embodiment of the present application further provides a power conversion device 21, which may be any power conversion device 21 in the above embodiments.

[0064] The embodiment of the present application further provides a battery device 22, which may be any battery device 22 in the above embodiments.

[0065] Figure 6 It is a schematic diagram of a communication method of the energy storage system 20 according to an embodiment of the present application.

[0066] Finally, the present application embodiment further provides a communication method, which is applied to any energy storage system 20 in the above embodiments. Figure 6 As shown, the power conversion device 21 in the energy storage device can be connected to N battery devices 22 through power lines 23, and the number of power lines 23 corresponds to the number of battery devices 22, that is, the power conversion device 21 can be connected to the Nth battery device 22 through the Nth power line 23, and the power line 23 can be used to transmit electrical energy between the power conversion device 21 and the battery device 22.

[0067] like Figure 6 As shown, the communication method may include: The power conversion device 21 modulates the control information into a first communication signal, and sends the first communication signal to the battery device 22 through the power line 23 .

[0068] The power conversion device 21 receives the second communication signal from the battery device 22 through the power line 23, and demodulates the second communication signal to obtain battery information.

[0069] The battery device 22 modulates the battery information into a second communication signal, and sends the second communication signal to the power conversion device 21 through the power line 23 .

[0070] The battery device 22 receives the first communication signal from the power conversion device 21 through the power line 23 and demodulates the first communication signal to obtain control information.

[0071] The power conversion device 21 collects electrical data of the power line 23, and associates the electrical data with the battery information obtained by demodulating the second communication signal to generate a plurality of associated information. The electrical data of the power line 23 includes the voltage and / or current of the power line 23, and the associated information is used to indicate the association relationship between the power line 23 and the battery device 22.

[0072] The power conversion device 21 generates control information based on the related information.

[0073] In the method embodiment of the present application, the power conversion device 21 can be any one of the above-mentioned device embodiments, so the structure of the power conversion device 21 is not described in detail. Similarly, the battery device 22 can be any one of the above-mentioned device embodiments, so the structure of the battery device 22 is not described in detail.

[0074] It can be understood that the above-mentioned communication method is used to realize information interaction between the power conversion device 21 and the battery device 22. Therefore, the order of each process may not be restricted. For example, the power conversion device 21 may first collect electrical data from the power line 23, and associate the electrical data with the battery information obtained by demodulating the second communication signal to generate multiple associated information, and then generate control information based on the associated information, and then modulate the control information into a first communication signal, and send the first communication signal to the battery device 22 through the power line 23; the power conversion device 21 may also first receive the second communication signal of the battery device 22 through the power line 23, and demodulate the battery information according to the second communication signal, and then collect the electrical data of the power line 23, and associate the electrical data with the battery information obtained by demodulating the second communication signal to generate multiple associated information, and then generate control information based on the associated information, and then modulate the control information into a first communication signal, and send the first communication signal to the battery device 22 through the power line 23.

[0075] Similarly, the battery device 22 can first modulate the battery information into a second communication signal, and send the second communication signal to the power conversion device 21 through the power line 23, and then receive the first communication signal of the power conversion device 21 through the power line 23, and demodulate the control information according to the first communication signal; the battery device 22 can also first receive the first communication signal of the power conversion device 21 through the power line 23, and demodulate the control information according to the first communication signal, and then modulate the battery information into a second communication signal, and send the second communication signal to the power conversion device 21 through the power line 23.

[0076] Thus, through the communication method of the embodiment of the present application, the power conversion device 21 exchanges information with the battery device 22 through the power line 23. When only the power line 23 needs to be installed, the data information (such as battery information and control information) used to control the charging of the battery device 22 can be coupled to the power line 23 for transmission. Thus, the information used to control the charging of the battery device 22 forms a unique correspondence with the power line 23, and there is no need to install a communication line, which can reduce the problem of wiring errors between the power conversion device 21 and the battery device 22, and compared with the traditional physical foolproofing method, it can also reduce material diversity.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. An energy storage system, characterized in that: include: A power conversion device and at least one battery device, wherein the power conversion device is used to convert electric energy, and the battery device is used to store electric energy, the power conversion device and each of the battery devices are connected via a corresponding power line, and the power conversion device supplies power to the battery device via the power line; The power conversion device comprises a control unit and a first transceiver unit, the control unit is connected to the first transceiver unit, and the first transceiver unit is connected to the power line; The battery device comprises a battery management unit and a second transceiver unit, the battery management unit is connected to the second transceiver unit, and the second transceiver unit is connected to the power line; The first transceiver unit is used to modulate the control information output by the control unit into a first communication signal, and send the first communication signal to the battery device through the power line, and is used to receive a second communication signal of the battery device through the power line, and demodulate the second communication signal to obtain battery information; The second transceiver unit is used to modulate the battery information output by the battery management unit into the second communication signal, and send the second communication signal to the power conversion device through the power line, and to receive the first communication signal of the power conversion device through the power line, and demodulate the control information according to the first communication signal.

2. The energy storage system according to claim 1, characterized in that: The power conversion device further includes a pre-charging circuit, which is connected to the power line and the control unit, and is used to pre-charge the battery device before the power conversion device supplies power to the battery device; The first transceiver unit includes a first coupling sensor, which is disposed on the power line between the pre-charging circuit and the battery device, and is used to send the first communication signal and to receive the second communication signal.

3. The energy storage system according to claim 1, characterized in that: The battery device further comprises a switch unit, the switch unit being connected to the power line and the battery management unit, and the switch unit being used to control a connection state between the power line and the battery management unit; The second transceiver unit includes a second coupling sensor, which is arranged on the power line between the switch unit and the power conversion device, and is used to send the second communication signal and receive the first communication signal.

4. The energy storage system according to claim 1, characterized in that: The control unit is also used to collect electrical data of the power line, and generate multiple associated information based on the electrical data and battery information obtained by demodulating the second communication signal; the electrical data of the power line includes the voltage and / or current of the power line, and the associated information is used to indicate the associated relationship between the power line and the battery device.

5. The energy storage system according to claim 4, characterized in that: The power conversion device also includes a power conversion circuit, which is used to convert the power of electrical energy and / or the form of electrical energy. The control unit controls the power conversion circuit to supply power to the associated battery device based on the associated information.

6. A power conversion device, characterized in that: include: The power conversion device is used to convert electric energy, the power conversion device and at least one battery device are connected via a power line, the power conversion device supplies power to the battery device via the power line, and the battery device is used to store electric energy; The power conversion device comprises: A control unit and a first transceiver unit, wherein the control unit is connected to the first transceiver unit, and the first transceiver unit is connected to the power line; Among them, the first transceiver unit is used to modulate the control information output by the control unit into a first communication signal, and send the first communication signal to the battery device through the power line, and / or, to receive a second communication signal of the battery device through the power line, and demodulate the second communication signal to obtain battery information.

7. The power conversion device according to claim 6, characterized in that: The power conversion device further comprises a pre-charging circuit, which is connected in parallel to the power line and is used to pre-charge the battery device before the power conversion device supplies power to the battery device; The first transceiver unit includes a first coupling sensor, which is disposed between the pre-charging circuit and the battery device, and is used to send the first communication signal and to receive the second communication signal.

8. A battery device, characterized in that: include: The battery device is used to store electric energy, at least one of the battery devices is connected to a power conversion device via a power line, the power conversion device supplies power to the battery device via the power line, and the power conversion device is used to convert electric energy; The battery device comprises: a battery management unit and a second transceiver unit, wherein the battery management unit is connected to the second transceiver unit, and the second transceiver unit is connected to the power line; Among them, the second transceiver unit is used to modulate the battery information output by the battery management unit into a second communication signal, and send the second communication signal to the power conversion device through the power line, and / or, to receive the first communication signal of the power conversion device through the power line, and demodulate the first communication signal to obtain control information.

9. The battery device according to claim 8, characterized in that: The battery device is further provided with a switch unit, which is provided between the power line and the battery device and is used to control the connection state between the power line and the battery device; The second transceiver unit includes a second coupling sensor, which is disposed between the switch unit and the power conversion device, and is used for sending the second communication signal and receiving the first communication signal.

10. A communication method, applied to an energy storage system, the energy storage system comprising a power conversion device and at least one battery device, the power conversion device being connected to each of the battery devices via a corresponding power line, characterized in that: include: The power conversion device modulates the control information into a first communication signal, and sends the first communication signal to the battery device through the power line, and receives a second communication signal from the battery device through the power line, and demodulates the second communication signal to obtain battery information; as well as, The battery device modulates the battery information into the second communication signal, and sends the second communication signal to the power conversion device through the power line, and receives the first communication signal from the power conversion device through the power line, and demodulates the first communication signal to obtain the control information; The power conversion device collects electrical data of the power line, and associates the electrical data with battery information obtained by demodulating the second communication signal to generate a plurality of associated information, wherein the electrical data of the power line includes a voltage and / or a current of the power line, and the associated information is used to indicate an associated relationship between the power line and the battery device; The power conversion device generates the control information based on the associated information.

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