Communication device, communication method, and power storage system

Abstract

In a power storage system in which a CAN data frame including information on states of a plurality of storage batteries and a CAN ID is transmitted from the storage batteries to a state monitoring device via a CAN, the state monitoring device is capable of acquiring the information on the states of the plurality of storage batteries. A communication device (100) includes a CAN ID conversion device (101-1) configured to convert a CAN ID included in a CAN data frame into a BMS ID for identifying a battery (B1) and state information of the battery.

Description

Technical Field

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

[0002] A system for collecting information about the state of a battery (hereinafter referred to as state information) and remotely monitoring the battery is known (for example, see Patent Document 1). The system disclosed in Patent Document 1 includes various sensors for detecting the state of the battery, such as a voltage sensor, a current sensor, and a temperature sensor, a controller that inputs detection signals from the sensors, and a communication interface for transmitting the battery state information, etc., to the controller.

[0003] Citation List

[0004] Patent Literature

[0005] Patent Document 1: JP2020-530256A Summary of the Invention

[0006] Technical issues

[0007] Consider a scenario where a power storage system is implemented using batteries used in electric vehicles or batteries not used in electric vehicles, and a controller area network (CAN) communication unit for electric vehicles that transmits battery status information via CAN. In this scenario, if multiple batteries and multiple CAN communication units are used in or designed for the same vehicle model, the CAN IDs (CAN data frames) for the same type of data transmitted from the multiple CAN communication units may overlap. For example, the CAN ID for one battery voltage may be the same as the CAN ID for another battery voltage. Consequently, CAN data frames may collide on the CAN bus, and the condition monitoring device may be unable to obtain status information for multiple batteries.

[0008] In view of the above situation, the object of the present invention is to provide a communication device, a communication method and a power storage system, in which a CAN data frame including status information and CAN IDs of multiple batteries is sent from the battery to a status monitoring device via CAN, so that the status monitoring device can obtain the status information of multiple batteries.

[0009] Solution to the problem

[0010] A communication device according to the present invention is provided in a power storage system including a plurality of storage batteries and a status monitoring device configured to monitor the status of the plurality of storage batteries. The communication device 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 batteries to the status monitoring device via a CAN (Controller Area Network). The communication device includes: a conversion unit configured to convert the first CAN ID into a first identifier for identifying the status information and the storage battery, wherein the conversion unit has battery identification information for identifying the storage battery, and the conversion unit is configured to perform: a first generation process for generating the first identifier based on the first CAN ID and the battery identification information received from the storage battery; a second generation process for generating first reference information representing a relationship between the battery identification information, the first identifier, and the status information, and referenced by the status monitoring device, based on the 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; and a first conversion process for converting the first CAN ID into the first identifier.

[0011] The communication method of the present invention is a communication method for sending status information, which is information about the status of the batteries, and a CAN ID for identifying the status information, from the batteries to the status monitoring device via CAN in a power storage system including multiple batteries and a status monitoring device configured to monitor the status of the multiple batteries. The communication method includes: a first generation step of generating an identifier for identifying the status information and the battery based on the CAN ID received from the battery and the battery identification information for identifying the battery; a second generation step of generating reference information representing the relationship between the battery identification information, the identifier, and the status information and referenced by the status monitoring device based on the battery identification information, the identifier generated in the first generation step, and the CANID received from the battery and the status information; and a conversion step of converting the CAN ID into the identifier.

[0012] The power storage system of the present invention includes: a plurality of storage batteries; a state monitoring device configured to monitor the states of the plurality of storage batteries; and a communication device configured to transmit state information, which is information about the states of the storage batteries, and a CAN ID for identifying the state information, from the storage batteries to the state monitoring device via a CAN, wherein the communication device includes a conversion unit configured to convert the CAN ID into an identifier for identifying the state information and the storage battery, the conversion unit having battery identification information for identifying the storage battery, and the conversion unit is configured to perform: a first generation process for generating the identifier based on the CAN ID and the battery identification information received from the storage battery; a second generation process for generating reference information representing a relationship between the battery identification information, the identifier, and the state information, and referenced by the state monitoring device, based on the battery identification information, the identifier generated in the first generation process, the CAN ID and the state information received from the storage battery; and a conversion process for converting the CAN ID into the identifier.

[0013] Advantageous Effects of the Invention

[0014] According to the present invention, in a power storage system in which CAN data frames including state information of a plurality of storage batteries and CAN IDs are transmitted from storage batteries to a state monitoring device via CAN, the state monitoring device can acquire state information of the plurality of storage batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a circuit diagram showing a circuit configuration of a power storage system including a communication device according to an embodiment of the present invention.

[0016] Figure 2 It is shown by Figure 1 Functional block diagram of an example of functions implemented by the communication device shown.

[0017] Figure 3 is a table showing an example of CAN ID and data included in a CAN data frame transmitted from a battery.

[0018] Figure 4 It shows Figure 2 An example of a CAN ID conversion table is shown in FIG.

[0019] Figure 5 It shows Figure 2 An example of a BMS ID table is shown.

[0020] Figure 6 is a flowchart illustrating an example of a process for generating a CANID conversion table and a BMSID table.

[0021] Figure 7 is a flow chart showing communication between a battery and a BMS. DETAILED DESCRIPTION

[0022] The present invention will be described below with reference to preferred embodiments. The present invention is not limited to the embodiments described below, and the embodiments may be appropriately modified without departing from the gist of the present invention. In the embodiments to be described below, some configurations may not be described or shown in the drawings, and regarding omitted technical details, publicly known or well-known technologies will be appropriately applied as long as they do not conflict with the contents described below.

[0023] Figure 1 1 is a circuit diagram showing a circuit configuration of a power storage system 1 including a communication device 100 according to an embodiment of the present invention. Figure 1 The illustrated power storage system 1 is a stationary or vehicle-mounted power source and includes a plurality of strings STR or a single string STR, a power converter PC, and a battery management system (BMS) 10. When there are a plurality of strings STR, the plurality of strings STR are connected in parallel.

[0024] The string STR includes a plurality of batteries B1 to Bn connected in series. Each of the batteries B1 to Bn includes a plurality of cells C1 to Cn connected in series. The batteries B1 to Bn of this embodiment are used for electric vehicles and recycled, or are prepared for electric vehicles and are not used. Therefore, there may be differences in the degree of deterioration between the batteries B1 to Bn. The batteries B1 to Bn are lithium-ion batteries, etc., and are discharged through a power converter PC (described later) to supply power to an external system (not shown). The external system includes a load, a generator, etc. When the power storage system 1 is a fixed power supply, household appliances, commercial power supply systems, etc. are used as loads, and solar photovoltaic power generation systems, etc. are used as generators. On the other hand, when the power storage system 1 is a vehicle-mounted power supply, a drive motor, an air conditioner, various vehicle-mounted electrical components, etc. are used as loads. The drive motor is both a load and a generator. On the other hand, the 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.

[0025] The string STR includes a plurality of battery modules BM1 to BMn and a current sensor 14. The battery modules BM1 to BMn include 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, respectively. The batteries B1 to Bn, the cell protection IC 12, and the CAN transceiver IC 13 are either used in electric vehicles and recycled, or are prepared for use in electric vehicles and are not used.

[0026] The battery ECU 11 detects and determines the status of batteries B1 to Bn and controls bypass units BU1 to BUn. The cell protection IC 12 detects overcharge, overdischarge, discharge overcurrent, and charge overcurrent in batteries C1 to Cn, detects and interrupts short-circuit currents, detects disconnection, recovers batteries C1 to Cn from overcharge or overdischarge, and balances cells C1 to Cn.

[0027] The battery ECU 11 transmits information about the status of batteries B1 to Bn (hereinafter referred to as battery status information) to the CAN transceiver IC 13. On the other hand, the battery ECU 11 receives information about the control of batteries B1 to Bn (hereinafter referred to as battery control information) from the CAN transceiver IC 13. Examples of the battery status information transmitted from the battery ECU 11 include the state of charge (SOC). Furthermore, examples of the battery control information received by the battery ECU 11 include voltage command values, current command values, and control information for bypass units BU1 to BUn (ON / OFF of switches S1 and S2, described later).

[0028] The cell protection IC 12 transmits battery status information to the CAN transceiver IC 13 and receives battery control information from the CAN transceiver IC 13. Examples of the battery status information transmitted from the cell protection IC 12 include the voltages of the battery cells C1 to Cn and the currents of the battery cells B1 to Bn. Furthermore, examples of the battery control information received by the cell protection IC 12 include voltage command values ​​and current command values.

[0029] The CAN transceiver IC 13 transmits battery status information to the BMS 10 and receives battery control information from the BMS 10 through CAN communication performed by the communication device 100. The communication device 100 will be described later.

[0030] The power converter PC is a bidirectional converter, and is connected to the string bus 3. Furthermore, the power converter PC is connected to the positive electrode of the starting battery B1 and the negative electrode of the ending battery Bn.

[0031] When charging the string STR, the power converter PC converts the voltage input from the string bus 3 according to the commanded value of the charging power (or charging current) and outputs the converted voltage to the multiple batteries B1 to Bn. The voltage across the string STR varies depending on the bypass state of the batteries B1 to Bn (the number of batteries B1 to Bn bypassed) and the charge 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 into the voltage across the string STR and outputs the converted voltage to the multiple batteries B1 to Bn.

[0032] When a string STR is discharging, the power converter PC converts the voltage input from multiple batteries B1 to Bn according to the command 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 batteries B1 to Bn or the charge state of batteries B1 to Bn. Therefore, when multiple strings STR operate in parallel, the input voltage of the power converter PC between the strings STRs varies during discharge. Therefore, when a string STR is discharging, the power converter PC converts the input voltage to a voltage that matches the other strings STRs and outputs the converted voltage to the string bus 3. When the current flowing through the string bus 3 is AC power, the power converter PC includes a synchronization unit for tracking instantaneous value changes.

[0033] Bypass units BU1 to BUn are provided for batteries B1 to Bn, respectively. Each bypass unit 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. Switch S1 is provided on the bypass line BL. Switch S1 is, for example, a mechanical switch, a semiconductor switch, or a relay. Switch S2 is provided between the positive electrode of each battery B1 to Bn and one end of the bypass line BL. Switch S2 is, for example, a mechanical switch, a semiconductor switch, or a relay.

[0034] The starting battery B1 and the ending battery Bn are connected to the external system via the power converter PC and the string bus 3. When the switch S1 is closed and the switch S2 is open in all bypass units BU1 to BUn, all batteries B1 to Bn are connected in series. On the other hand, when the switch S2 is opened and the switch S1 is closed in any one of the bypass units BU1 to BUn, the batteries B1 to Bn corresponding to the bypass units BU1 to BUn are bypassed.

[0035] A current sensor 14 is provided on the power line of the string STR. The current sensor 14 detects the charge and discharge current of the string STR and transmits a detection signal to the BMS 10. Furthermore, the string STR is 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. Furthermore, the temperature sensor detects the ambient temperature of the string STR and transmits a detection signal to the BMS 10.

[0036] The BMS 10 communicates with a host controller (not shown), multiple battery ECUs 11, and multiple cell protection ICs 12, and controls and manages multiple battery modules BM1 to BMn. Furthermore, the BMS 10 controls and manages auxiliary devices provided in the string STR. Examples of the auxiliary devices include a power converter PC and a current sensor 14.

[0037] Based on the battery status information received from the battery ECU 11 and the cell protection IC 12 via CAN, the BMS 10 monitors the status of batteries B1 to Bn and generates and transmits battery control information. The battery control information includes information about the control of the bypass units BU1 to BUn, as well as information about the voltage command values ​​and current command values ​​for the batteries B1 to Bn. Here, the BMS 10 receives the command values ​​for the charge and discharge power (or charge and discharge current) of the string STR from the host controller, and calculates the voltage command values ​​and current command values ​​for the batteries B1 to Bn based on the command values ​​for the charge and discharge power and the status information of the batteries B1 to Bn. In addition, the BMS 10 determines whether to allow the request to control the bypass units BU1-BUn sent from the battery ECU 11, and transmits the bypass control information to the battery ECU 11 based on the result of this determination.

[0038] The communication device 100 includes a plurality of CAN ID conversion devices 101-1 to 101-n and a BMS ID table 102. The CAN ID conversion devices 101-1 to 101-n are provided for each battery module BM1 to BMn. It is not necessary to provide a plurality of CAN ID conversion devices 101-1 to 101-n and have them correspond one-to-one to the battery modules BM1 to BMn. A single CAN ID conversion device may be provided with a plurality of input and output terminals, and the input and output terminals may correspond one-to-one to the battery modules BM1 to BMn.

[0039] 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 referenced when converting a CAN ID included in a CAN data frame into a BMS ID described later.

[0040] The CAN ID conversion unit 101B converts the CAN ID included in the CAN data frame transmitted from the CAN transceiver IC 13 into the BMS ID with reference 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 the CAN ID with reference to the CAN ID conversion table 101A, and transmits the converted CAN data frame to the CAN transceiver IC 13.

[0041] Each table generation unit 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 status information and batteries B1 to Bn upon receiving CAN data frames from the CAN ID conversion devices 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.

[0042] Figure 2 It is shown by Figure 1 A functional block diagram showing an example of functions implemented by the communication device 100 is shown. Figure 2 Communication between the battery module BM1 and the BMS 10 is shown, and communication between the other battery modules BM2 to BMn and the BMS 10 is also performed in the same manner.

[0043] When the battery B1 is newly connected to the power storage system 1, Figure 2 The CAN ID conversion device 101-1 shown is installed between the battery module BM1 and the BMS10 (see Figure 1 ). Here, in this embodiment, the battery B1, the cell protection IC 12, and the CAN transceiver IC 13 are used for or prepared for an electric vehicle. In contrast, the bypass unit BU1, the battery ECU 11, and the CAN ID conversion device 101-1 are newly installed. When the battery module BM1 including the bypass unit BU1 is used, the bypass unit BU1 can also be used. In addition, when the battery ECU 11 can be reused, there is no need to reinstall the bypass unit BU1, the battery ECU 11, and the CAN ID conversion device 101-1.

[0044] like Figure 2 As shown, a CAN data frame including a CAN ID and battery status information is transmitted from the CAN transceiver IC 13 to the CAN ID conversion device 101 - 1 via the CAN.

[0045] Figure 3 This table shows an example of the CAN ID 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 used to identify the data. The voltage, current, and SOC correspond to battery status information, while the voltage command value, current command value, and control information for bypass unit BU1 correspond to battery control information.

[0046] Here, the CAN ID used to identify the status and control information of batteries B1 to Bn is set for each vehicle model. Therefore, for example, if batteries B1 and B2 are batteries for the same vehicle model, the CAN IDs used to identify the battery status and control information overlap between batteries B1 and B2. For example, the CAN IDs used to identify the voltage of batteries B1 and B2 are identical. Consequently, CAN data frames sent from batteries B1 and B2 may conflict with each other on the CAN bus and may not be received by the BMS 10.

[0047] Therefore, in this embodiment, if Figure 2 As shown, the CAN ID conversion device 101-1 converts the CAN ID included in the CAN data frame received from the battery B1 into a BMS ID recognizable by the BMS 10. The CAN ID conversion device 101-1 converts the CAN ID into the BMS ID by referring to the CAN ID conversion table 101A.

[0048] On the other hand, the CANID conversion device 101-1 converts the BMSID included in the CAN data frame received from the BMS 10 into a CANID that can be identified on the battery B1. The CANID conversion device 101-1 converts the BMS ID into a CAN ID with reference to the CAN ID conversion table 101A.

[0049] Figure 4 It shows Figure 2 The table shows an example of a CAN ID conversion table 101A. As shown in the table, the CAN ID conversion table 101A is a table showing the correspondence between the battery number, CAN ID, BMS ID, and data. The table shows the CAN ID conversion table 101A corresponding to the battery B1 with the battery number 1. The CAN ID conversion table 101A shown in the table is stored in the CAN ID conversion device 101-1 connected to the battery module BM1 via the CAN. The CAN ID conversion tables 101A corresponding to the other battery numbers, namely, batteries B2 to Bn, have the same Figure 4 The CAN ID converter 101A has different battery No. and BMS ID as shown in the table.

[0050] like Figure 4 As shown in the table, the CAN ID in the CAN ID conversion table 101A is Figure 3 On the other hand, the BMS ID of the CAN ID conversion table 101A is set to be able to identify the battery No. and data type.

[0051] like Figure 2As shown, the CAN ID conversion device 101-1 includes a CAN ID conversion table 101A, a CAN ID conversion unit 101B, and a table generation unit 101C. Upon receiving a CAN data frame from the CAN transceiver IC 13, the CAN ID conversion unit 101B converts the CAN ID into a BMS ID by referring to the CAN ID conversion table 101A. The CAN ID conversion unit 101B then transmits the ID-converted CAN data frame to the BMS 10. On the other hand, upon receiving a CAN data frame from the BMS 10, the CAN ID conversion unit 101B converts the BMS ID into a CAN ID by referring to the CAN ID conversion table 101A. The CAN ID conversion unit 101B then transmits the ID-converted CAN data frame to the CAN transceiver IC 13.

[0052] The table generation unit 101C generates the BMS ID, CAN ID conversion table 101A, and the BMS ID table 102. The BMS ID table 102 is a table that the BMS 10 refers to when receiving a CAN data frame including battery status information and when generating a CAN data frame including battery control information.

[0053] Figure 5 It shows Figure 2 1 shows an example of a BMS ID table 102. As shown in this table, BMS ID table 102 represents 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 (battery number 1), and the BMS ID and data corresponding to battery B2 (battery number 2). BMS ID table 102 shown in this table is stored in the BMS 10, a host controller, or an external server (not shown).

[0054] Figure 2 Table generation unit 101C shown stores battery number information for identifying batteries B1 to Bn. When a new battery B1 to Bn is connected, table generation unit 1011C acquires a CAN data frame from CAN transceiver IC 13. Table generation unit 101C then generates a BMS ID based on the CAN ID included in the acquired CAN data frame and the pre-stored battery number information. Table generation unit 101C generates CAN ID conversion table 101A based on the CAN ID and data included in the acquired CAN data frame, as well as the generated BMS ID. Furthermore, table generation unit 101C generates BMS ID table 102 based on the CAN ID and data included in the acquired CAN data frame, the pre-stored battery number information, and the generated BMS ID.

[0055] When the BMS 10 receives a CAN data frame from the CANID conversion device 101-1, it identifies the data type corresponding to the BMS ID included in the CAN data frame by referring to the BMS ID table 102. Furthermore, when generating battery control information, the BMS 10 refers to the BMS ID table 102 and stores the battery control information and the BMS ID in the CAN data frame in association with each other.

[0056] Figure 6 101A and the BMS ID table 102. When new batteries B1 to Bn are connected to the power storage system 1, the BMS ID table 102 shown in the flowchart is generated.

[0057] First, in step S1, the operator installs CAN ID conversion devices 101-1 to 101-n corresponding to newly connected batteries B1 to Bn between the battery modules BM1 to BMn and the BMS 10. The installed CAN ID conversion devices 101-1 to 101-n store battery No. information of the newly connected batteries B1 to Bn.

[0058] Next, in step S2, the table generation unit 101C determines whether new batteries B1 to Bn are connected to the power storage system 1 based on whether CAN data frames have been received from the battery modules BM1 to BMn. If the determination in step S2 is yes, the process proceeds to step S3, and if the determination in step S2 is no, the process proceeds to step S6.

[0059] In step S3, table generation unit 101C obtains CAN data frames including various data and CAN IDs from CAN transceiver ICs 13 corresponding to new batteries B1 to Bn. Here, "various data" includes battery status information and battery control information. The CAN ID used to identify battery status information corresponds to the first CAN ID, and the CAN ID used to identify battery control information corresponds to the second CAN ID.

[0060] Next, in step S4, the table generation unit 101C generates a BMS ID based on the stored battery No. 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 status information, and a second identifier for identifying the batteries B1 to Bn and the type of battery control information.

[0061] Next, in step S5, table generation unit 101C transmits the BMS ID generated in step S4, the battery status information and battery control information identified by the BMS ID, and the battery No. information to BMS ID table 102. Thus, BMS ID table 102 corresponding to the newly connected batteries B1 to Bn is generated. The above processing of steps S2 and S5 is repeated while BMS 10 is operating ("No" in step S6) and ends when the operation of BMS 10 ends ("Yes" in step S6).

[0062] Figure 7 1 is a flowchart showing communication between the batteries B1 to Bn and the BMS 10. The processing shown in the flowchart starts when the operation of the BMS 10 starts.

[0063] First, in step S11, the CAN ID conversion unit 101B determines whether a CAN data frame is received from the CAN transceiver IC 13. If the determination in step S11 is yes, the process proceeds to step S12, and if the determination in step S11 is no, the process proceeds to step S13.

[0064] In step S12, the CAN ID conversion unit 101B converts the CAN ID included in the CAN data frame received from the CAN transceiver IC 13 into a BMS ID with reference to the CAN ID conversion table 101A. The CAN ID conversion unit 101B then transmits the ID-converted CAN data frame to the BMS 10.

[0065] Next, in step S13, the CANID conversion unit 101B determines whether a CAN data frame is received from the BMS 10. If the determination in step S13 is yes, the process proceeds to step S14, and if the determination in step S13 is no, the process proceeds to step S15.

[0066] 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 only receives CAN data frames that include the BMS ID included in CAN ID conversion table 101A and converts the BMS ID into a CAN ID on the received CAN data frame. CAN ID conversion unit 101B then transmits the CAN data frame after ID conversion to CAN transceiver IC 13. The processes in steps S11 and S14 described above are repeated while BMS 10 is operating ("No" in step S15) and terminate when the BMS 10 ends ("Yes" in step S15).

[0067] 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 No. information for identifying the batteries B1 to Bn.

[0068] Here, when a new battery B1 to Bn is connected, the CAN ID conversion devices 101-1 to 101-n obtain the CAN ID regarding 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 No. information obtained from the battery B1 to Bn (first generation process).

[0069] Next, the CAN ID conversion devices 101-1 to 101-n generate a BMSID table 102 indicating the relationship between the battery No., BMSID, and battery status information based on the battery No. information, the generated BMSID, and the CANID and battery status information received from the batteries B1 to Bn (second generation processing).

[0070] When a CAN data frame containing battery status 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 to a BMS ID (a first conversion process). This process references CAN ID conversion table 101A, which shows the relationship between CAN IDs and BMS IDs. CAN ID conversion devices 101-1 to 101-n then transmit the CAN data frame after ID conversion to BMS 10.

[0071] Therefore, even when implementing the power storage system 1 using batteries B1 to Bn for the same vehicle model, duplication of CAN IDs regarding the same type of battery status information transmitted from different battery modules BM1 to BMn can be prevented. Consequently, the BMS 10 can acquire CAN data frames transmitted from different battery modules BM1 to BMn on the CAN bus without conflict. The BMS 10 can then refer to the BMS ID table 102 to identify which of the batteries B1 to Bn the battery status information included in the acquired CAN data frame corresponds to.

[0072] Furthermore, in the communication device 100 of the present embodiment, the CAN ID conversion table 101A is used as reference information indicating the relationship between the battery No. information, the CAN ID regarding the battery control information, and the BMS ID regarding the control information regarding the batteries B1 to Bn.

[0073] Here, when new batteries B1 to Bn are connected, the CAN ID conversion devices 101-1 to 101-n obtain the CAN IDs of the battery control information from the batteries B1 to Bn. Next, the CAN ID conversion devices 101-1 to 101-n generate the BMS IDs of the battery control information based on the CAN IDs of the battery control information and the battery No. information (third generation process).

[0074] Next, the CAN ID conversion devices 101-1 to 101-n generate a BMSID table 102 representing the relationship between the battery No. information, the BMSID, and the battery control information based on the battery No. information, the generated BMSID, and the CANID and battery control information received from the batteries B1 to Bn (fourth generation processing).

[0075] When a CAN data frame containing battery control information and a CAN ID is transmitted from the BMS 10 to batteries B1 to Bn, the CAN ID conversion devices 101-1 to 101-n convert the BMS ID into a CAN ID (a second conversion process). This process refers to a CAN ID conversion table 101A that shows the relationship between the CAN ID and the BMS ID. The CAN ID conversion devices 101-1 to 101-n then transmit the CAN data frame after the ID conversion to batteries B1 to Bn.

[0076] Therefore, even when implementing the power storage system 1 using batteries B1 to Bn for the same vehicle model, duplication of CAN IDs for the same type of battery control information transmitted from the BMS 10 to different battery modules BM1 to BMn can be prevented. Consequently, CAN data frames transmitted from the BMS 10 to different battery modules BM1 to BMn can be received by the battery modules BM1 to BMn on the CAN bus without conflict. The BMS 10 can then refer to the BMS ID table 102 to identify which battery module BM1 to BMn the battery control information included in the transmitted CAN data frame corresponds to.

[0077] Although the present invention has been described above based on the above embodiments, the present invention is not limited to the above embodiments, and modifications can be made without departing from the gist of the present invention, or known or well-known technologies can be appropriately combined.

[0078] For example, in the above embodiment, the storage battery is a battery, but the storage battery may be another type of secondary battery such as a capacitor. Furthermore, in the above embodiment, CAN ID conversion table 101A and BMS ID table 102 are generated when batteries B1 to Bn are newly connected. However, the connection of new batteries B1 to Bn may be confirmed at predetermined time intervals, and CAN ID conversion table 101A and BMS ID table 102 may be generated when the connection is confirmed.

[0079] Although various embodiments have been described above, it goes without saying that the present invention is not limited to these examples. Obviously, those skilled in the art can propose various modifications or corrections within the scope of the claims, and it should be understood that such modifications or corrections naturally fall within the technical scope of the present invention. In addition, the components described in the above embodiments can be freely combined without departing from the gist of the present invention.

[0080] This application is based on Japanese patent application (No. 2023-30007) filed on February 28, 2023, the contents of which are incorporated herein by reference.

[0081] Reference Mark List

[0082] 1: Power storage system

[0083] 10: BMS (condition monitoring system)

[0084] 100: Communication device

[0085] 101-1 to 101-n: CAN ID conversion device (conversion unit)

[0086] 102: BMS ID table (first reference information, second reference information, reference information)

[0087] B1 to Bn: Battery (storage battery)

Claims

1. A communication device provided in a power storage system including a plurality of storage batteries and a condition monitoring device configured to monitor the conditions of the plurality of storage batteries, wherein the communication device transmits information regarding the conditions of the storage batteries, i.e., condition information, and a first CAN ID for identifying the condition information, from the storage batteries to the condition monitoring device via a controller area network, the communication device comprising: a conversion unit configured to convert the first CAN ID into a first identifier for identifying the status information and the battery, wherein The conversion unit has battery identification information for identifying the battery, and The conversion unit is configured to perform: a first generating process for generating the first identifier based on the first CAN ID and the battery identification information received from the battery; a second generation process for generating, based on the battery identification information, the first identifier generated in the first generation process, and the first CANID and the status information received from the battery, first reference information indicating a relationship between the battery identification information, the first identifier, and the status information, and referenced by the status monitoring device; and The first conversion process is used to convert the first CAN ID into the first identifier.

2. The communication device according to claim 1, wherein Information on the control of the battery, namely, control information and a second identifier for identifying the control information and the battery, is transmitted from the condition monitoring device to the battery via the controller area network, and The conversion unit is configured to perform: a third generation process for receiving a second CAN ID for identifying the control information from the battery, and generating the second identifier based on the second CAN ID and the battery identification information, a fourth generation process for generating second reference information, which indicates a relationship between the battery identification information, the second identifier, and the status information, and is referenced by the status monitoring device, based on the battery identification information, the second identifier generated in the third generation process, the second CANID received from the battery, and the status information; and The second conversion process is used to convert the second identifier into the second CAN ID.

3. A communication method for transmitting, in a power storage system including a plurality of storage batteries and a condition monitoring device configured to monitor the conditions of the plurality of storage batteries, information regarding the conditions of the storage batteries (i.e., condition information) and a CAN ID for identifying the condition information from the storage batteries to the condition monitoring device via a controller area network, the communication method comprising: a first generating step of generating an identifier for identifying the state information and the battery based on the CAN ID received from the battery and battery identification information for identifying the battery; a second generating step of generating reference information, which is referenced by the condition monitoring device, based on the battery identification information, the identifier generated in the first generating step, and the CAN ID and the condition information received from the battery. The reference information indicates a relationship between the battery identification information, the identifier, and the condition information. as well as The conversion step converts the CAN ID into the identifier.

4. A power storage system comprising: Multiple batteries; a state monitoring device configured to monitor the states of the plurality of storage batteries; as well as A communication device configured to send information about the state of the battery, i.e., state information, and a CAN ID for identifying the state information from the battery to the state monitoring device via a controller area network, wherein The communication device includes a conversion unit configured to convert the CAN ID into an identifier for identifying the status information and the battery, The conversion unit has battery identification information for identifying the battery, and The conversion unit is configured to perform: a first generation process for generating the identifier based on the CAN ID and the battery identification information received from the battery, a second generation process for generating reference information indicating a relationship between the battery identification information, the identifier, and the status information, and for reference by the status monitoring device, based on the battery identification information, the identifier generated in the first generation process, and the CAN ID and the status information received from the battery; and The conversion process is used to convert the CAN ID into the identifier.

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