Communication device, communication method, and power storage system

Abstract

To allow a state monitoring device to acquire information on the state of a plurality of storage batteries, in a power storage system in which a data frame of a can including CAN ID and the information on the state of the plurality of storage batteries is transmitted from a side of the storage batteries to a side of the state monitoring device through a CAN.SOLUTION: A communication device 100 comprises a CAN ID conversion device 101-1 that converts a CAN ID included in a data frame of a CAN into a BMS ID for identifying a battery B1 and information on the state of the battery.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a communication device, a communication method, and a power storage system. [Background technology]

[0002] There is known a system that collects information about the state of a battery (hereinafter referred to as state information) and monitors the battery remotely (see, for example, Patent Document 1). The system described in Patent Document 1 includes various sensors that detect the state of the battery, such as a voltage sensor, a current sensor, and a temperature sensor, a controller to which the detection signals of the sensors are input, and a communication interface for communicating the battery state information and the like input to the controller. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2020-530256 Summary of the Invention [Problem to be solved by the invention]

[0004] Assume a case where an energy storage system is configured using storage batteries used in electric vehicles or unused storage batteries intended for electric vehicles, and a CAN (Controller Area Network) communication unit for electric vehicles that transmits status information about the storage batteries via a CAN. In this scenario, if multiple storage batteries and multiple CAN communication units are used in or designed for the same vehicle model, the CAN IDs for the same type of data transmitted from the multiple CAN communication units will overlap. For example, the CAN ID for the voltage of one storage battery will be the same as the CAN ID for the voltage of another storage battery. As a result, CAN data frames may collide on the CAN bus, potentially preventing the status monitoring device from obtaining status information about the multiple storage batteries.

[0005] In view of the above circumstances, the present invention aims to provide a communication device, a communication method, and a storage system in which a CAN data frame containing status information of multiple storage batteries and a CAN ID is transmitted from the storage battery side to the status monitoring device side via the CAN, enabling the status information of multiple storage batteries to be acquired by the status monitoring device. [Means for solving the problem]

[0006] The communication device of the present invention is provided in a power storage system including a plurality of storage batteries and a status monitoring device that monitors the status of the plurality of storage batteries, and transmits status information, which is information about the status of the storage batteries, and a first CAN ID for identifying the status information, from the storage battery side via a CAN (Controller Area Network). and converting the first CAN ID into a first identifier for identifying the status information and the storage battery, and A communication device that transmits the first CAN ID to the status monitoring device side, Record number 1 The conversion part that converts to an identifier For each of the storage batteries The conversion unit handle Battery identification information for identifying the battery is provided; Whether or not the storage battery is newly connected to the power storage system is determined based on whether or not the status information and the first CAN ID are received from the storage battery side, and if the storage battery is newly connected to the power storage system, The device executes a first generation process to generate the first identifier based on the first CAN ID received from the storage battery side and the storage battery identification information, a second generation process to generate first reference information that indicates the relationship between the storage battery identification information, the first identifier, and the status information and is referenced by the status monitoring device based on the storage battery identification information, the first identifier, and the status information received from the storage battery side, and a first conversion process to convert the first CAN ID into the first identifier.

[0007] The communication method of the present invention is a method for communicating, in a power storage system including a plurality of storage batteries and a status monitoring device that monitors the status of the plurality of storage batteries, status information that is information about the status of the storage batteries and a CAN ID for identifying the status information, from the storage battery side via a CAN. and converting the CAN ID into an identifier for identifying the status information and the storage battery, and A communication method for transmitting to the status monitoring device side, Whether or not the storage battery is newly connected to the power storage system is determined based on whether or not the status information and the CAN ID are received from the storage battery side, and if the storage battery is newly connected to the power storage system,Based on the CAN ID received from the storage battery and storage battery identification information for identifying the storage battery, Memorandum The method includes a first generation step of generating an identifier, a second generation step of generating reference information that indicates the relationship between the battery identification information, the identifier, and the status information and is referenced by the status monitoring device based on the battery identification information, the identifier generated in the first generation step, the CAN ID, and the status information received from the battery side, and a conversion step of converting the CAN ID into the identifier.

[0008] The power storage system of the present invention includes a plurality of storage batteries, a status monitoring device that monitors the status of the plurality of storage batteries, and a CAN ID that identifies the status information and transmits the status information from the storage battery side via a CAN. and converting the CAN ID into an identifier for identifying the status information and the storage battery, and a communication device that transmits the CAN ID to the status monitoring device side, Memorandum The conversion part to convert to Besshi For each of the storage batteries The conversion unit handle Battery identification information for identifying the battery is provided; Whether or not the storage battery is newly connected to the power storage system is determined based on whether or not the status information and the CAN ID are received from the storage battery side, and if the storage battery is newly connected to the power storage system, A first generation process is executed to generate the identifier based on the CAN ID and the battery identification information received from the storage battery side; a second generation process is executed to generate reference information that indicates the relationship between the battery identification information, the identifier, and the status information and is referenced by the status monitoring device based on the battery identification information, the identifier, and the CAN ID and the status information received from the storage battery side; and a conversion process is executed to convert the CAN ID into the identifier. [Effects of the Invention]

[0009] According to the present invention, in a power storage system in which a CAN data frame containing status information of multiple storage batteries and a CAN ID is transmitted from the storage battery side to the status monitoring device side via the CAN, the status monitoring device can acquire the status information of the multiple storage batteries. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a circuit diagram showing the circuit configuration of a power storage system including a communication device according to one embodiment of the present invention. [Figure 2] FIG. 2 is a functional block diagram illustrating an example of functions realized by the communication device illustrated in FIG. [Figure 3] FIG. 3 is a table showing an example of CAN IDs and data included in a CAN data frame transmitted from the battery side. [Figure 4] FIG. 4 is a table showing an example of the CAN ID conversion table shown in FIG. [Figure 5] FIG. 5 is a table showing an example of the BMS ID table shown in FIG. [Figure 6] FIG. 6 is a flowchart illustrating an example of a procedure for generating a CAN ID conversion table and a BMS ID table. [Figure 7] FIG. 7 is a flowchart for explaining communication between the battery side and the BMS side. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention will be described below in accordance with preferred embodiments. Note that the present invention is not limited to the embodiments described below, and the embodiments can be modified as appropriate without departing from the spirit of the present invention. In addition, in the embodiments described below, some components are omitted from illustration and description, but for the details of the omitted technologies, publicly known or well-known technologies are applied as appropriate within the scope of not causing any contradictions with the content described below.

[0012] Fig. 1 is a circuit diagram showing the circuit configuration of a power storage system 1 including a communication device 100 according to one embodiment of the present invention. The power storage system 1 shown in this diagram is a stationary or vehicle-mounted power supply, and includes a single or multiple strings STR, a power converter PC, and a BMS (Battery Management System) 10. When there are multiple strings STR, the multiple strings STR are connected in parallel.

[0013] The string STR includes a plurality of batteries B1 to Bn connected in series. Each battery B1 to Bn includes a plurality of cells C1 to Cn connected in series. In this embodiment, the batteries B1 to Bn are batteries recovered from use in electric vehicles or batteries prepared for electric vehicles but unused. Therefore, there may be differences in the degree of deterioration among the batteries B1 to Bn. The batteries B1 to Bn are lithium-ion batteries or the like, and discharge power through a power converter PC (described later) to supply power to an external system (not shown). The external system includes a load, a generator, or the like. When the power storage system 1 is a stationary system, household appliances, commercial power systems, etc., serve as loads, and a solar power generation system, etc., serves as a generator. On the other hand, when the power storage system 1 is an in-vehicle system, the loads include a drive motor, an air conditioner, various in-vehicle electrical components, etc. The drive motor serves as both a load and a generator. Meanwhile, power generated by the generator is supplied to the batteries B1 to Bn through the power converter PC, and the batteries B1 to Bn are charged.

[0014] The string STR includes a plurality of battery modules BM1 to BMn and a current sensor 14. Each battery module BM1 to BMn includes batteries B1 to Bn, a battery ECU (Electronic Control Unit) 11, a cell protection IC (Integrated Circuit) 12, a CAN transceiver IC 13, and bypass units BU1 to BUn. The batteries B1 to Bn, cell protection IC 12, and CAN transceiver IC 13 are either batteries that have been used in electric vehicles and then collected, or batteries that have been prepared for electric vehicles and are unused.

[0015] The battery ECU 11 detects the states of the batteries B1 to Bn, determines the states of the batteries B1 to Bn, and controls the bypass units BU1 to BUn, etc. The cell protection IC 12 detects overcharge, overdischarge, discharge overcurrent, and charge overcurrent of the cells C1 to Cn, detects and cuts off short-circuit current, detects disconnection, recovers the cells C1 to Cn from an overcharge state or an overdischarge state, and performs cell balancing of the cells C1 to Cn, etc.

[0016] The battery ECU 11 transmits information about the states of the batteries B1 to Bn (hereinafter referred to as battery state information) to the CAN transceiver IC 13. On the other hand, the battery ECU 11 receives information about the control of the batteries B1 to Bn (hereinafter referred to as battery control information) from the CAN transceiver IC 13. The battery state information transmitted from the battery ECU 11 includes a State of Charge (SOC), etc. The battery control information received by the battery ECU 11 includes a voltage command value, a current command value, and control information for the bypass units BU1 to BUn (ON / OFF of switches S1 and S2, which will be described later), etc.

[0017] Each cell protection IC 12 transmits battery status information to each CAN transceiver IC 13 and receives battery control information from each CAN transceiver IC 13. The battery status information transmitted from each cell protection IC 12 includes the voltage of cells C1 to Cn, the current of batteries B1 to Bn, etc. The battery control information received by the cell protection IC 12 includes a voltage command value, a current command value, etc.

[0018] The CAN transceiver IC 13 transmits battery state information to the BMS 10 side through CAN communication by the communication device 100, and receives battery control information from the BMS 10 side. The communication device 100 will be described later.

[0019] The power converter PC is a bidirectional converter and is connected to the string bus 3. The power converter PC is also connected to the positive terminal of the starting battery B1 and the negative terminal of the terminal battery Bn.

[0020] When charging the string STR, the power converter PC converts the voltage input from the string bus 3 according to the instruction value of the charging power (or charging current) and outputs it to the multiple batteries B1 to Bn. Here, the voltage on the string STR side changes according to the bypass state of the batteries B1 to Bn (the number of bypassed batteries B1 to Bn) and the charging state of the batteries B1 to Bn. Therefore, when charging the string STR, the power converter PC converts the voltage input from the string bus 3 to the voltage on the string STR side and outputs it to the multiple batteries B1 to Bn.

[0021] When a string STR is discharged, the power converter PC converts the voltage input from the batteries B1 to Bn according to the specified value of the discharge power (or discharge current) and outputs the converted voltage to the string bus 3. Here, the input voltage of the power converter PC during discharge varies depending on the bypass state of the batteries B1 to Bn and the charge state of the batteries B1 to Bn. As a result, when multiple strings STR are operated in parallel, variations occur in the input voltage of the power converter PC between the strings STR during discharge. Therefore, when a string STR is discharged, the power converter PC converts the input voltage to a voltage that matches the other strings STR and outputs the converted voltage to the string bus 3. Note that when the current flowing through the string bus 3 is AC, the power converter PC is provided with synchronization means for tracking changes in instantaneous values.

[0022] A bypass unit BU1 to BUn is provided for each of the batteries B1 to Bn. Each of the bypass units BU1 to BUn includes a bypass line BL and switches S1 and S2. The bypass line BL is a power line that bypasses each of the batteries B1 to Bn. The switch S1 is provided on the bypass line BL. This switch S1 is, for example, a mechanical switch, a semiconductor switch, or a relay. The switch S2 is provided between the positive electrode of each of the batteries B1 to Bn and one end of the bypass line BL. This switch S2 is, for example, a mechanical switch, a semiconductor switch, or a relay.

[0023] The starting battery B1 and the ending battery Bn are connected to an external system via a power converter PC and a string bus 3. When the switch S1 is turned OFF and the switch S2 is turned ON in all of the bypass units BU1 to BUn, all of the batteries B1 to Bn are connected in series. On the other hand, when the switch S2 is turned OFF and the switch S1 is turned ON in any of the bypass units BU1 to BUn, the battery B1 to Bn corresponding to that bypass unit BU1 to BUn is bypassed.

[0024] The current sensor 14 is provided on the power line of the string STR. This current sensor 14 detects the charging / discharging current of the string STR and transmits a detection signal to the BMS 10. The string STR is also provided with a voltage sensor, a temperature sensor, and the like (not shown). The voltage sensor detects the total voltage of the string STR and transmits a detection signal to the BMS 10. The temperature sensor detects the ambient temperature of the string STR and transmits a detection signal to the BMS 10.

[0025] The BMS 10 communicates with a higher-level controller (not shown), multiple battery ECUs 11, and multiple cell protection ICs 12, and controls and manages multiple battery modules BM1 to BMn. The BMS 10 also controls and manages auxiliary devices provided in the string STR. These auxiliary devices include a power converter PC and a current sensor 14.

[0026] The BMS 10 monitors the states of the batteries B1 to Bn and generates and transmits battery control information based on battery state information received from the battery ECU 11 and the cell protection IC 12 via the CAN. The battery control information includes information about the control of the bypass units BU1 to BUn and information about the voltage and current command values ​​of the batteries B1 to Bn. Here, the BMS 10 receives command values ​​for the charge / discharge power (or charge / discharge current) of the string STR from a higher-level controller, and calculates the voltage and current command values ​​of the batteries B1 to Bn based on the command values ​​and the state information of the batteries B1 to Bn. The BMS 10 also determines whether or not to accept a request for control of the bypass units BU1 to BUn transmitted from the battery ECU 11, and transmits bypass control information according to the determination result to the battery ECU 11.

[0027] The communication device 100 includes a plurality of CAN ID conversion devices 101-1 to 101-n and a BMS ID table 102. Each CAN ID conversion device 101-1 to 101-n is provided for each battery module BM1 to BMn. Note that it is not essential to provide a plurality of CAN ID conversion devices 101-1 to 101-n and establish a one-to-one correspondence between the CAN ID conversion devices 101-1 to 101-n and the battery modules BM1 to BMn. A single CAN ID conversion device may be provided with a plurality of input / output terminals and establish a one-to-one correspondence between the input / output terminals and the battery modules BM1 to BMn.

[0028] Each of the CAN ID conversion devices 101-1 to 101-n includes a CAN ID conversion table 101A, a CAN ID conversion unit 101B, and a table generation unit 101C. The CAN ID conversion table 101A is a table that is referenced when converting between a CAN ID included in a CAN data frame and a BMS ID, which will be described later.

[0029] The CAN ID conversion unit 101B converts the CAN ID included in the CAN data frame transmitted from the CAN transceiver IC13 into a BMS ID by referring to the CAN ID conversion table 101A, and transmits the converted CAN data frame to the BMS 10. On the other hand, the CAN ID conversion unit 101B converts the BMS ID included in the CAN data frame transmitted from the BMS 10 into a CAN ID by referring to the CAN ID conversion table 101A, and transmits the converted CAN data frame to the CAN transceiver IC13.

[0030] Each table generator 101C generates each CAN ID conversion table 101A and a BMS ID table 102. The BMS ID table 102 is a table that the BMS 10 refers to when identifying battery state information and batteries B1 to Bn upon receiving a CAN data frame from each of the CAN ID converters 101-1 to 101-n. The BMS ID table 102 is also a table that the BMS 10 refers to when generating battery control information.

[0031] Fig. 2 is a functional block diagram showing an example of functions realized by the communication device 100 shown in Fig. 1. Note that although Fig. 2 shows communication between the battery module BM1 and the BMS10, communication between the other battery modules BM2 to BMn and the BMS10 is also performed in the same manner.

[0032] The CAN ID conversion device 101-1 shown in FIG. 2 is installed between the battery module BM1 and the BMS 10 when a battery B1 is newly connected to the power storage system 1 (see FIG. 1). In this embodiment, the battery B1, cell protection IC 12, and CAN transceiver IC 13 are used in electric vehicles or are prepared for electric vehicles. In contrast, the bypass unit BU1, battery ECU 11, and CAN ID conversion device 101-1 are newly installed. Note that when a battery module BM1 including a bypass unit BU1 is used, the bypass unit BU1 may also be used. Furthermore, if the battery ECU 11 can be reused, it is not necessary to install a new one.

[0033] As shown in FIG. 2, a CAN data frame including a CAN ID and battery state information is transmitted from the CAN transceiver IC 13 to the CAN ID conversion device 101-1 via the CAN.

[0034] 3 is a table showing an example of CAN IDs and data included in a CAN data frame transmitted from battery B1. As shown in this table, the CAN data frame transmitted from battery B1 includes data such as voltage, current, SOC, voltage command value, current command value, and control information for bypass unit BU1, as well as a CAN ID for identifying this data. Note that the voltage, current, and SOC correspond to battery state information, and the voltage command value, current command value, and control information for bypass unit BU1 correspond to battery control information.

[0035] Here, the CAN IDs for identifying the status information and control information of batteries B1 to Bn are set for each vehicle model. Therefore, for example, if battery B1 and battery B2 are batteries for the same vehicle model, the CAN IDs for identifying the battery status information and battery control information of battery B1 and battery B2 will overlap. For example, the CAN IDs for identifying the voltage of battery B1 and the voltage of battery B2 will be the same. Therefore, there is a possibility that the CAN data frame transmitted from battery B1 and the CAN data frame transmitted from battery B2 will collide on the CAN bus and not be acquired by BMS10.

[0036] 2, in this embodiment, the CAN ID conversion device 101-1 converts the CAN ID included in the CAN data frame received from the battery B1 side into a BMS ID that can be identified by the BMS 10. The CAN ID conversion device 101-1 converts the CAN ID into a BMS ID by referring to a CAN ID conversion table 101A.

[0037] On the other hand, the CAN ID conversion device 101-1 converts the BMS ID included in the CAN data frame received from the BMS 10 into a CAN ID that can be identified on the battery B1 side. The CAN ID conversion device 101-1 converts the BMS ID into a CAN ID by referring to the CAN ID conversion table 101A.

[0038] 4 is a table showing an example of the CAN ID conversion table 101A shown in FIG. 2. As shown in this table, the CAN ID conversion table 101A is a table showing the correspondence between battery numbers, CAN IDs, BMS IDs, and data. This table shows the CAN ID conversion table 101A corresponding to battery B1, whose battery number is 1. The CAN ID conversion table 101A shown in this table is stored in a CAN ID conversion device 101-1 connected to battery module BM1 via a CAN. Note that the CAN ID conversion tables 101A corresponding to batteries B2 to Bn, which have other battery numbers, have different battery numbers and BMS IDs from the CAN ID conversion table 101A shown in the table of FIG. 4.

[0039] As shown in the table of Fig. 4, the CAN IDs in the CAN ID conversion table 101A match the CAN IDs included in the CAN data frames shown in the table of Fig. 3. On the other hand, the BMS IDs in the CAN ID conversion table 101A are set so that the battery number and the type of data can be identified.

[0040] 2, CAN ID conversion device 101-1 includes CAN ID conversion table 101A, CAN ID conversion unit 101B, and table generation unit 101C. When CAN ID conversion unit 101B receives a CAN data frame from CAN transceiver IC13, it refers to CAN ID conversion table 101A and converts the CAN ID into a BMS ID. Then, CAN ID conversion unit 101B transmits the ID-converted CAN data frame to BMS10. On the other hand, when CAN ID conversion unit 101B receives a CAN data frame from BMS10, it refers to CAN ID conversion table 101A and converts the BMS ID into a CAN ID. Then, CAN ID conversion unit 101B transmits the ID-converted CAN data frame to CAN transceiver IC13.

[0041] The table generation unit 101C generates a BMS ID, a CAN ID conversion table 101A, and a BMS ID table 102. The BMS ID table 102 is a table that the BMS 10 refers to when it receives a CAN data frame including battery state information and when it generates a CAN data frame including battery control information.

[0042] Fig. 5 is a table showing an example of the BMS ID table 102 shown in Fig. 2. As shown in this table, the BMS ID table 102 is a table showing the correspondence between battery numbers, BMS IDs, and data (battery status information and battery control information). This table shows the BMS ID and data corresponding to battery B1, whose battery number is 1, and the BMS ID and data corresponding to battery B2, whose battery number is 2. The BMS ID table 102 shown in this table is stored in the BMS 10, a higher-level controller, or an external server (not shown).

[0043] The table generation unit 101C shown in FIG. 2 stores battery number information for identifying batteries B1 to Bn. When a new battery B1 to Bn is connected, the table generation unit 101C acquires a CAN data frame from the CAN transceiver IC13. Then, the table generation unit 101C generates a BMS ID based on the CAN ID included in the acquired CAN data frame and pre-stored battery number information. The table generation unit 101C also generates a CAN ID conversion table 101A based on the CAN ID and data included in the acquired CAN data frame and the generated BMS ID. Furthermore, the table generation unit 101C generates a BMS ID table 102 based on the CAN ID and data included in the acquired CAN data frame, pre-stored battery number information, and the generated BMS ID.

[0044] When the BMS10 receives a CAN data frame from the CAN ID conversion device 101-1, it refers to the BMS ID table 102 to identify the type of data corresponding to the BMS ID included in the CAN data frame. On the other hand, when generating battery control information, the BMS10 refers to the BMS ID table 102 to associate the battery control information with the BMS ID and store the associated information in the CAN data frame.

[0045] 6 is a flowchart illustrating an example of a procedure for generating the CAN ID conversion table 101A and the BMS ID table 102. The BMS ID table 102 shown in this flowchart is generated when a new battery B1 to Bn is connected to the power storage system 1.

[0046] First, in step S1, an operator installs CAN ID conversion devices 101-1 to 101-n corresponding to batteries B1 to Bn to be newly connected between battery modules BM1 to BMn and the BMS 10. The installed CAN ID conversion devices 101-1 to 101-n store battery number information of the newly connected batteries B1 to Bn.

[0047] Next, in step S2, the table generation unit 101C determines whether or not a new battery B1 to Bn is connected to the power storage system 1 based on whether or not a CAN data frame has been received from the battery modules BM1 to BMn. If a positive determination is made in step S2, the process proceeds to step S3, and if a negative determination is made in step S2, the process proceeds to step S6.

[0048] In step S3, the table generation unit 101C acquires a CAN data frame including various data and a CAN ID from the CAN transceiver IC13 corresponding to the new battery B1 to Bn. Here, the "various data" includes battery state information and battery control information. The CAN ID for identifying the battery state information corresponds to the first CAN ID, and the CAN ID for identifying the battery control information corresponds to the second CAN ID.

[0049] Next, in step S4, the table generation unit 101C generates a BMS ID based on the stored battery number information and the CAN ID included in the CAN data frame received from the CAN transceiver IC 13. The BMS ID generated in step S4 includes a first identifier for identifying the batteries B1 to Bn and the type of battery state information, and a second identifier for identifying the batteries B1 to Bn and the type of battery control information.

[0050] Next, in step S5, table generator 101C transmits the BMS ID generated in step S4, the battery state information and battery control information identified by the BMS ID, and the battery number information to BMS ID table 102. This generates BMS ID table 102 corresponding to newly connected batteries B1 to Bn. The above processing of steps S2 to S5 is repeated while BMS 10 is operating (NO in step S6), and ends when operation of BMS 10 ends (YES in step S6).

[0051] 7 is a flowchart for explaining communication between the batteries B1 to Bn and the BMS 10. The process shown in this flowchart starts when the BMS 10 starts operating.

[0052] First, in step S11, the CAN ID conversion unit 101B determines whether or not a CAN data frame has been received from the CAN transceiver IC 13. If a positive determination is made in step S11, the process proceeds to step S12, and if a negative determination is made in step S11, the process proceeds to step S13.

[0053] In step S12, the CAN ID conversion unit 101B refers to the CAN ID conversion table 101A and converts, into a BMS ID, the CAN ID included in the CAN data frame received from the CAN transceiver IC 13. Then, the CAN ID conversion unit 101B transmits the ID-converted CAN data frame to the BMS 10.

[0054] Next, in step S13, the CAN ID conversion unit 101B determines whether or not a CAN data frame has been received from the BMS 10. If a positive determination is made in step S13, the process proceeds to step S14, and if a negative determination is made in step S13, the process proceeds to step S15.

[0055] In step S14, CAN ID conversion unit 101B refers to CAN ID conversion table 101A and converts the BMS ID included in the CAN data frame received from BMS 10 into a CAN ID. At this time, CAN ID conversion unit 101B receives only CAN data frames including a BMS ID included in CAN ID conversion table 101A, and converts the BMS ID into a CAN ID for the received CAN data frame. CAN ID conversion unit 101B then transmits the ID-converted CAN data frame to CAN transceiver IC 13. The processing of steps S11 to S14 above is repeated while BMS 10 is operating (NO in step S15), and ends when operation of BMS 10 ends (YES in step S15).

[0056] As described above, the communication device 100 of this embodiment includes the CAN ID conversion devices 101-1 to 101-n. The CAN ID conversion devices 101-1 to 101-n have battery number information for identifying the batteries B1 to Bn.

[0057] When a new battery B1 to Bn is connected, the CAN ID conversion devices 101-1 to 101-n acquire the CAN ID for the battery status information from the battery B1 to Bn. Next, the CAN ID conversion devices 101-1 to 101-n generate a BMS ID for identifying the battery status information and the battery B1 to Bn based on the CAN ID and battery number information acquired from the battery B1 to Bn (first generation process).

[0058] Next, the CAN ID conversion devices 101-1 to 101-n generate a BMS ID table 102 showing the relationship between the battery number, BMS ID, and battery status information based on the battery number information, the generated BMS ID, and the CAN ID and battery status information received from the batteries B1 to Bn (second generation process).

[0059] When a CAN data frame including battery state information and a CAN ID is transmitted from batteries B1 to Bn to BMS 10, CAN ID conversion devices 101-1 to 101-n convert the CAN ID into a BMS ID (first conversion process). In this process, CAN ID conversion table 101A indicating the relationship between CAN IDs and BMS IDs is referenced. CAN ID conversion devices 101-1 to 101-n then transmit the ID-converted CAN data frame to BMS 10.

[0060] This prevents overlapping of CAN IDs for the same type of battery status information transmitted from different battery modules BM1-BMn, even when the power storage system 1 is configured using batteries B1-Bn for the same vehicle model. Therefore, the BMS 10 can acquire CAN data frames transmitted from different battery modules BM1-BMn without causing collisions on the CAN bus. Then, by referring to the BMS ID table 102, the BMS 10 can identify which battery B1-Bn the battery status information contained in the acquired CAN data frame corresponds to.

[0061] Furthermore, in the communication device 100 of this embodiment, the CAN ID conversion table 101A serves as reference information indicating the relationship between battery number information, CAN IDs for battery control information, and BMS IDs for control information of batteries B1 to Bn.

[0062] When a new battery B1 to Bn is connected, the CAN ID conversion devices 101-1 to 101-n acquire the CAN ID for the battery control information from the battery B1 to Bn. Next, the CAN ID conversion devices 101-1 to 101-n generate a BMS ID for the battery control information based on the CAN ID for the battery control information and the battery number information (third generation process).

[0063] Next, the CAN ID conversion devices 101-1 to 101-n generate a BMS ID table 102 showing the relationship between the battery number information, the BMS ID, and the battery control information based on the battery number information, the generated BMS ID, and the CAN ID and battery control information received from the batteries B1 to Bn (fourth generation process).

[0064] Then, when a CAN data frame including battery control information and a CAN ID is transmitted from the BMS 10 side to the batteries B1 to Bn side, the CAN ID conversion devices 101-1 to 101-n convert the BMS ID into a CAN ID (second conversion process). In this process, the CAN ID conversion table 101A showing the relationship between the CAN ID and the BMS ID is referenced. Then, the CAN ID conversion devices 101-1 to 101-n transmit the ID-converted CAN data frame to the batteries B1 to Bn side.

[0065] This prevents the CAN IDs of the same type of battery control information transmitted from the BMS 10 to different battery modules BM1-BMn from overlapping, even when the power storage system 1 is configured using batteries B1-Bn for the same vehicle model. Therefore, the CAN data frames transmitted from the BMS 10 to the different battery modules BM1-BMn can be acquired by the battery modules BM1-BMn without causing collisions on the CAN bus. The BMS 10 can then identify which battery module BM1-BMn the battery control information included in the transmitted CAN data frame corresponds to, by referring to the BMS ID table 102.

[0066] The present invention has been described above based on the above-mentioned embodiment, but the present invention is not limited to the above-mentioned embodiment, and modifications may be made within the scope of the spirit of the present invention, and publicly known or well-known technologies may be combined as appropriate.

[0067] For example, in the above-described embodiment, the storage battery is a battery, but the storage battery may be another secondary battery such as a capacitor. Also, in the above-described embodiment, the CAN ID conversion table 101A and the BMS ID table 102 are generated when a new battery B1 to Bn is connected. However, the connection of a new battery B1 to Bn may be checked at predetermined time intervals, and the CAN ID conversion table 101A and the BMS ID table 102 may be generated when the connection is confirmed. [Explanation of symbols]

[0068] 1: Energy storage system 10: BMS (condition monitoring system) 100: Communication equipment 101-1 to 101-n: CAN ID conversion device (conversion unit) 102: BMS ID table (first reference information, second reference information, reference information) B1~Bn: Battery (storage battery)

Claims

1. A communication device provided in a power storage system including a plurality of storage batteries and a status monitoring device that monitors the status of the plurality of storage batteries, the communication device receiving status information, which is information about the status of the storage batteries, and a first CAN ID for identifying the status information from the storage batteries via a CAN (Controller Area Network), converting the first CAN ID into a first identifier for identifying the status information and the storage batteries, and transmitting the status information and the first identifier to the status monitoring device, a conversion unit configured to convert the first CAN ID into the first identifier for each of the storage batteries; The conversion unit having storage battery identification information for identifying the corresponding storage battery; a first generation process of determining whether the storage battery has been newly connected to the power storage system based on whether the status information and the first CAN ID have been received from the storage battery, and generating the first identifier based on the first CAN ID and the storage battery identification information received from the storage battery when the storage battery has been newly connected to the power storage system; a second generation process for generating first reference information, which indicates a relationship between the storage battery identification information, the first identifier, and the status information and is referenced by the status monitoring device, based on the storage battery identification information, the first identifier generated in the first generation process, and the first CAN ID and the status information received from the storage battery; a first conversion process for converting the first CAN ID into the first identifier; A communication device that performs the above.

2. receiving control information, which is information regarding control of the storage battery, and a second identifier for identifying the control information and the storage battery, from the status monitoring device side via a CAN; converting the second identifier into a second CAN ID for identifying the control information, using the conversion unit; and transmitting the control information and the second CAN ID to the storage battery side; The conversion unit a third generation process of receiving the second CAN ID from the storage battery and generating the second identifier based on the second CAN ID and the storage battery identification information; a fourth generation process for generating second reference information, which indicates a relationship between the storage battery identification information, the second identifier, and the control information and is referenced by the status monitoring device, based on the storage battery identification information, the second identifier generated in the third generation process, and the second CAN ID and the control information received from the storage battery; a second conversion process for converting the second identifier into the second CAN ID; The communication device according to claim 1 , wherein the communication device executes the following:

3. A communication method for a power storage system including a plurality of storage batteries and a status monitoring device that monitors the status of the plurality of storage batteries, comprising: receiving, via a CAN, status information that is information about the status of the storage batteries and a CAN ID for identifying the status information from the storage batteries; converting the CAN ID into an identifier for identifying the status information and the storage batteries; and transmitting the status information and the identifier to the status monitoring device, a first generation step of determining whether the storage battery has been newly connected to the power storage system based on whether the status information and the CAN ID have been received from the storage battery, and, when the storage battery has been newly connected to the power storage system, generating the identifier based on the CAN ID received from the storage battery and storage battery identification information for identifying the storage battery; a second generation step of generating reference information that indicates a relationship between the battery identification information, the identifier, and the status information, and that is referenced by the status monitoring device, based on the battery identification information, the identifier generated in the first generation step, and the CAN ID and the status information received from the battery side; a conversion step of converting the CAN ID into the identifier; A communication method comprising:

4. A plurality of storage batteries; a state monitoring device that monitors the states of the plurality of storage batteries; a communication device that receives, via a CAN, status information, which is information about the status of the storage battery, and a CAN ID for identifying the status information, from the storage battery side, converts the CAN ID into an identifier for identifying the status information and the storage battery, and transmits the status information and the identifier to the status monitoring device side; A power storage system comprising: the communication device includes a conversion unit for converting the CAN ID into the identifier for each of the storage batteries; The conversion unit having storage battery identification information for identifying the corresponding storage battery; a first generation process of determining whether the storage battery has been newly connected to the power storage system based on whether the status information and the CAN ID have been received from the storage battery, and generating the identifier based on the CAN ID and the storage battery identification information received from the storage battery when the storage battery has been newly connected to the power storage system; a second generation process for generating reference information that indicates a relationship between the storage battery identification information, the identifier, and the status information and is referenced by the status monitoring device, based on the storage battery identification information, the identifier generated in the first generation process, and the CAN ID and the status information received from the storage battery; A conversion process for converting the CAN ID into the identifier; A storage system that performs the above.

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