Identification information setting system

Abstract

[Problem] To provide an identification information setting system capable of efficiently setting identification information while reducing cost. [Solution] An identification information setting system 100 includes a wire harness 30. The wire harness 30 is such that a first connector 12 of a BMU 10 and respective second connectors 22 of a plurality of BMS 20 (20-1 to 20-7) are connected in a daisy chain, a portion where the Bit of the ID information is to be set to "0" connects ID terminal pins 12a, 12b, 12c and ID terminal pins 22a, 22b, 22c, and a portion where the ID information is to be set to "1" connects the ID terminal pins 12a, 12b, 12c and PASS terminal pins 22x, 22y, 22z.

Description

Identification information setting system

[0001] The present disclosure relates to an identification information setting system.

[0002] As conventional techniques, techniques such as those disclosed in Patent Documents 1 to 3 are disclosed.

[0003] Japanese Patent Publication No. 8-30577 Publication WO98 / 18078 Publication WO2017 / 187582 Publication

[0004] The identification information setting system disclosed herein includes, for example, a first device having a first control unit and a first connector, a plurality of second devices having a second control unit and a second connector, and a connecting member connecting the first device and the plurality of second devices, wherein the first connector has a predetermined number of first pins connected to a first voltage unit, the second connector has the predetermined number of second pins connected to a second voltage unit having a voltage different from that of the first voltage unit, and the predetermined number of pins are third pins that are not electrically connected to the first device, and the connecting member connects the first connector and each second connector of the plurality of second devices in a daisy chain manner, connecting the first pin and the second pin at a portion where it is desired to set a component of identification information used for communication between the first control unit and the second control unit to a specific value, and connecting the first pin and the third pin at a portion where it is desired to set the component to a non-specific value different from the specific value.

[0005] Fig. 1 is a conceptual diagram showing an identification information setting system 100 according to an embodiment. Fig. 2 is a diagram showing the identification information setting system 100 according to an embodiment. Fig. 3 is a conceptual diagram showing an identification information setting system 100A according to a comparative example.

[0006] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the following embodiment is shown as a preferred example of an identification information setting system, and the embodiment is not limited to this example.

[0007] FIG. 1 is a conceptual diagram showing an identification information setting system 100 according to an embodiment. The identification information setting system 100 includes a BMU 10 (first device, battery management unit), multiple BMSs 20 (second device, battery management systems), and a wire harness 30 (connecting member). Each of the multiple BMSs 20 (20-1, 20-2, 20-3, 20-4) has the same configuration. The dotted lines in the figure indicate the circuit boards of the BMU 10 and the BMSs 20.

[0008] The BMU 10 has a first control unit 11 and a first connector 12. The BMS 20 has a second control unit 21 and a second connector 22. The first control unit 11 and the second control unit 21 are microcomputers (microcontrollers having a CPU, memory, etc.). The first control unit 11 and the second control unit 21 are capable of communicating with each other. The first control unit 11 and the second control unit 21 may be connected via a wire harness 30 or may be connected via other connection means.

[0009] When multiple BMSs 20 are connected to the BMU 10, the BMU 10 needs to number each BMS 20. The reason for numbering is that when the first control unit 11 of the BMU 10 communicates with the second control unit 21 of a BMS 20, it needs to determine which second control unit 21 of the BMS 20 it is communicating with. For this reason, in this system, ID information is set for the second control unit 21 of the BMS 20.

[0010] The wire harness 30 is a member that connects the BMU 10 and the plurality of BMSs 20. Specifically, the wire harness 30 connects the first connector 12 and the second connector 22, and connects the plurality of second connectors 22 together.

[0011] The first connector 12 has two (predetermined number) ID terminal pins 12a and 12b (first pins, CAN-ID1 and CAN-ID2) connected to ground 13 (first voltage section). The second connector 22 has two (predetermined number) ID terminal pins 22a and 22b (second pins, CAN-ID1 and CAN-ID2) connected to a pull-up resistor 23 (second voltage section) with a voltage (3.3 V) different from ground 13 (0 V), and two (predetermined number) PASS terminal pins 22x and 22y (third pins, PASS1 and PASS2) that are not electrically connected to the BMU 10. CAN-ID and PASS are lines for setting ID information. Note that lines for communication via CAN (Controller Area Network) must be installed separately from the lines for setting ID information. By setting ID information in the BMS 20, only BMSs 20 whose ID information matches the ID information specified by the BMU 10 during CAN communication can be identified and communicated with. Note that connection does not only mean a direct connection, but also an indirect (ultimate) connection (the same applies hereinafter).

[0012] The wire harness 30 connects the first connector 12 and each of the second connectors 22 of the multiple BMSs 20 in a daisy chain. Note that this diagram is a conceptual diagram for explaining the relationship between the BMUs 10 and the BMSs 20; in reality, the BMU 10 and the second-highest BMS 20 (20-2) are not directly connected. Specifically, the first-highest BMS 20 (20-1) is directly connected to the BMU 10 and the second-highest BMS 20 (20-2). Furthermore, the second-highest BMS 20 (20-2) is directly connected to the top-most BMS 20 (20-1) and the third-highest BMS 20 (20-3). Furthermore, the third-highest BMS 20 (20-3) is directly connected to the second-highest BMS 20 (20-2) and the fourth-highest BMS 20 (20-4). Furthermore, the fourth BMS 20 (20-4) from the top is directly connected to the third BMS 20 (20-3) from the top.

[0013] In addition, in the wire harness 30, the ID terminal pins 12a, 12b and ID terminal pins 22a, 22b are connected to each other at the part where it is desired to set a bit (component) of ID information (identification information) used for communication between the first control unit 11 and the second control unit 21 to "0 (specific value)," and the ID terminal pins 12a, 12b and PASS terminal pins 22x, 22y are connected to each other at the part where it is desired to set a bit of the ID information to "1 (non-specific value different from the specific value)."

[0014] The specific connections are as follows: In the topmost BMS 20 (20-1), the ID terminal pin 22a (CANID1) is connected to ground 13 via the ID terminal pin 12a (CANID1), and the ID terminal pin 22b (CANID2) is also connected to ground 13 via the ID terminal pin 12b (CANID2). Therefore, 3.3V is not applied by the pull-up resistor 23, and the ID information becomes "00."

[0015] The second BMS 20 (20-2) from the top has its ID terminal pin 22a (CANID1) not connected to ground 13, and its ID terminal pin 22b (CANID2) connected to ground 13 via its ID terminal pin 12b (CANID2). As a result, 3.3 V is applied only to the ID terminal pin 22a (CANID1) by the pull-up resistor 23, and the ID information becomes "01."

[0016] The third BMS 20 (20-3) from the top has its ID terminal pin 22a (CANID1) connected to ground 13 via its ID terminal pin 12a (CANID1), and its ID terminal pin 22b (CANID2) not connected to ground 13. As a result, 3.3 V is applied only to the ID terminal pin 22b (CANID2) by the pull-up resistor 23, and the ID information becomes "10."

[0017] The fourth BMS 20 (20-4) from the top has its ID terminal pin 22a (CANID1) not connected to ground 13, and its ID terminal pin 22b (CANID2) not connected to ground 13 either. Therefore, 3.3 V is applied to the ID terminal pin 22a (CANID1) and ID terminal pin 22b (CANID2) by the pull-up resistor 23, and the ID information becomes "11."

[0018] In this way, the ID information for the top BMS 20 (20-1) is "00," the second-highest BMS 20 (20-2) is "01," the third-highest BMS 20 (20-3) is "10," and the fourth-highest BMS 20 (20-4) is "11." The ID information is represented by a two-digit binary number, with the lower number of the BMS 20 being the first digit and the upper number being the second digit.

[0019] [Summary of BMU-BMS connection examples] An example of a connection between the BMU 10 and BMS 20 is as follows: (1) First connector 12 of BMU 10 The number of first connectors 12 for setting ID information is one, regardless of the number of BMSs 20. ID terminal pins 12a, 12b are provided for the number of bits desired to be expressed as ID information. In the example shown, 2-bit expression is used, and up to four BMSs can be added. The ID terminal pins 12a, 12b are all connected to the ground 13 of the BMU 10.

[0020] (2) The second connector 22 of the BMS 20 is provided with ID terminal pins 22a, 22b equal to the number of bits desired to be expressed as ID information. In the illustrated example, 2-bit expression is used. PASS terminal pins 22x, 22y are provided to which the BMU 10 and BMS 20 are not electrically connected. In the illustrated example, these are PASS1 and PASS2. When considering expanding the number of BMSs 20 to the maximum, it is preferable to make the number of ID terminal pins 22a, 22b of the BMS 20 the same as the number of PASS terminal pins 22x, 22y of the BMS 20.

[0021] (3) Wire Harness 30 Between BMU 10 and BMS 20 The wire harness 30 connects each BMS 20 like a daisy chain so that 1 bit = 1 line. In the illustrated example, there are 2 bits (the number of ID terminal pins = 2), so there are 2 lines (2 wires). When it is desired to set the bit of the ID information to "Low (0)," the wire harness 30 is connected between the BMU 10 and the BMS 20 (so that they are electrically connected). In this case, the bit is "Low" because it is connected to the ground 13 on the BMU 10 side. On the other hand, when it is desired to set the bit of the ID information to "High (1)," the wire harness 30 is connected to the PASS terminal pin so that the BMU 10 and the BMS 20 are not connected (so that they are not electrically connected) by the wire harness 30. In this case, the bit is pulled up on the BMS 20 side, so it is "High."

[0022] FIG. 2 is a diagram illustrating an identification information setting system 100 according to an embodiment. In FIG. 1, the first connector 12 of the BMU 10 has two ID terminal pins 12a and 12b (a predetermined number). However, in FIG. 2, the first connector 12 of the BMU 10 has three ID terminal pins 12a, 12b, and 12c (a predetermined number) (CANID1, CANID2, and CANID3). Accordingly, in FIG. 2, the second connector 22 of the BMS 20 (BMS 20-1 to BMS 20-7) also has three ID terminal pins 22a, 22b, and 22c (a predetermined number). The second connector 22 of the BMS 20 (BMS 20-1 to BMS 20-7) also has three PASS terminal pins 22x, 22y, and 22z (a predetermined number). The identification information setting system 100 in FIG. 2 illustrates an example in which up to seven BMSs 20 are connected. 2, a maximum of eight BMSs 20 can be connected. The basic configuration of the identification information setting system 100 in FIG. 2 is similar to that of the system shown in FIG.

[0023] The second connector 22 on the BMS 20 side is an upper and lower connector, and by providing the same pins on the upper and lower tiers, each BMS 20 can be connected in a daisy chain. The same pins on the upper and lower tiers are electrically connected. The upper and lower tier connectors can also be used in the system shown in Figure 1. Furthermore, the ID terminal pins 12a, 12b, and 12c of the first connector 12 of the BMU 10 are all connected to ground on the BMU 10 board. In the figure, CANID is sometimes abbreviated to ID.

[0024] The wire harness 30 of the identification information setting system 100 shown in Figure 2 connects the first connector 12 of the BMU 10 and each second connector 22 of the multiple BMSs 20 (20-1 to 20-7) in a daisy chain manner, and connects ID terminal pins 12a, 12b, and 12c to ID terminal pins 22a, 22b, and 22c where it is desired to set a bit of ID information to "0," and connects ID terminal pins 12a, 12b, and 12c to PASS terminal pins 22x, 22y, and 22z where it is desired to set the ID information to "1."

[0025] Specific connections made by the wire harness 30 are as follows: [Connections in the upper row in the figure: CAN-ID1 → PASS-1 → ID-1 → PASS-1 → ID-1 → PASS-1 → ID-1 → PASS-1] The wire harness 30 connects the ID terminal pin 12a (CAN-ID1) of the first connector 12 of the BMU 10 to the PASS terminal pin 22x (PASS-1) in the upper row of the second connector 22 of the first BMS 20-1.

[0026] The wire harness 30 connects the lower PASS terminal pin 22x (PASS1) of the second connector 22 of the first BMS 20-1 to the upper ID terminal pin 22a (ID1) of the second connector 22 of the second BMS 20-2. The wire harness 30 connects the lower ID terminal pin 22a (ID1) of the second connector 22 of the second BMS 20-2 to the upper PASS terminal pin 22x (PASS1) of the second connector 22 of the third BMS 20-3.

[0027] The wire harness 30 connects the lower PASS terminal pin 22x (PASS1) of the second connector 22 of the third BMS 20-3 to the upper ID terminal pin 22a (ID1) of the second connector 22 of the fourth BMS 20-4. The wire harness 30 connects the lower ID terminal pin 22a (ID1) of the second connector 22 of the fourth BMS 20-4 to the upper PASS terminal pin 22x (PASS1) of the second connector 22 of the fifth BMS 20-5.

[0028] The wire harness 30 connects the lower PASS terminal pin 22x (PASS1) of the second connector 22 of the fifth BMS 20-5 to the upper ID terminal pin 22a (ID1) of the second connector 22 of the sixth BMS 20-6. The wire harness 30 connects the lower ID terminal pin 22a (ID1) of the second connector 22 of the sixth BMS 20-6 to the upper PASS terminal pin 22x (PASS1) of the second connector 22 of the seventh BMS 20-7.

[0029] [Connections in the middle row of the figure: CANID2 → ID2 → PASS2 → PASS2 → ID2 → ID2 → PASS2 → PASS2] The wire harness 30 connects the ID terminal pin 12b (CANID2) of the first connector 12 of the BMU 10 to the ID terminal pin 22b (ID2) in the upper row of the second connector 22 of the first BMS 20-1.

[0030] The wire harness 30 connects the ID terminal pin 22b (ID2) in the lower row of the second connector 22 of the first BMS 20-1 to the PASS terminal pin 22y (PASS2) in the upper row of the second connector 22 of the second BMS 20-2. The wire harness 30 connects the PASS terminal pin 22y (PASS2) in the lower row of the second connector 22 of the second BMS 20-2 to the PASS terminal pin 22y (PASS2) in the upper row of the second connector 22 of the third BMS 20-3.

[0031] The wire harness 30 connects the lower PASS terminal pin 22y (PASS2) of the second connector 22 of the third BMS 20-3 to the upper ID terminal pin 22b (ID2) of the second connector 22 of the fourth BMS 20-4. The wire harness 30 connects the lower ID terminal pin 22b (ID2) of the second connector 22 of the fourth BMS 20-4 to the upper ID terminal pin 22b (ID2) of the second connector 22 of the fifth BMS 20-5.

[0032] The wire harness 30 connects the ID terminal pin 22b (ID2) in the lower row of the second connector 22 of the fifth BMS 20-5 to the PASS terminal pin 22y (PASS2) in the upper row of the second connector 22 of the sixth BMS 20-6. The wire harness 30 connects the PASS terminal pin 22y (PASS2) in the lower row of the second connector 22 of the sixth BMS 20-6 to the PASS terminal pin 22y (PASS2) in the upper row of the second connector 22 of the seventh BMS 20-7.

[0033] [Connections in the lower row in the figure: CANID3 → ID3 → ID3 → ID3 → PASS3 → PASS3 → PASS3 → PASS3] The wire harness 30 connects the ID terminal pin 12c (CANID3) of the first connector 12 of the BMU 10 to the ID terminal pin 22c (ID3) in the upper row of the second connector 22 of the first BMS 20-1.

[0034] The wire harness 30 connects the lower ID terminal pin 22c (ID3) of the second connector 22 of the first BMS 20-1 to the upper ID terminal pin 22c (ID3) of the second connector 22 of the second BMS 20-2. The wire harness 30 connects the lower ID terminal pin 22c (ID3) of the second connector 22 of the second BMS 20-2 to the upper ID terminal pin 22c (ID3) of the second connector 22 of the third BMS 20-3.

[0035] The wire harness 30 connects the ID terminal pin 22c (ID3) in the lower row of the second connector 22 of the third BMS 20-3 to the PASS terminal pin 22z (PASS3) in the upper row of the second connector 22 of the fourth BMS 20-4. The wire harness 30 connects the PASS terminal pin 22z (PASS3) in the lower row of the second connector 22 of the fourth BMS 20-4 to the PASS terminal pin 22z (PASS3) in the upper row of the second connector 22 of the fifth BMS 20-5.

[0036] The wire harness 30 connects the PASS terminal pin 22z (PASS3) in the lower row of the second connector 22 of the fifth BMS 20-5 to the PASS terminal pin 22z (PASS3) in the upper row of the second connector 22 of the sixth BMS 20-6. The wire harness 30 connects the PASS terminal pin 22z (PASS3) in the lower row of the second connector 22 of the sixth BMS 20-6 to the PASS terminal pin 22z (PASS3) in the upper row of the second connector 22 of the seventh BMS 20-7.

[0037] With this connection, the ID information of each BMS 20 is set in binary as follows: (1) ID information of the first BMS 20-1 = 001 (2) ID information of the second BMS 20-2 = 010 (3) ID information of the third BMS 20-3 = 011 (4) ID information of the fourth BMS 20-4 = 100 (5) ID information of the fifth BMS 20-5 = 101 (6) ID information of the sixth BMS 20-6 = 110 (7) ID information of the seventh BMS 20-7 = 111 The ID information is represented by a three-digit binary number, with the bottom number of the BMS 20 being the first digit, the middle number being the second digit, and the top number being the third digit. The BMU 10 then communicates with each BMS 20 using the ID information.

[0038] FIG. 3 is a conceptual diagram illustrating an identification information setting system 100A of the comparative example. The identification information setting system 100A of the comparative example does not use a daisy-chain connection using a wire harness 30. Therefore, one first connector 12 of the BMU 10 is not sufficient; a number of first connectors 12 is required for each BMS 20. Furthermore, each ID terminal pin 12a, 12b has a different connection configuration to the ground 13, which complicates the design. Furthermore, in the identification information setting system 100A of the comparative example, ID information is set and connected between the BMU 10 and the BMS 20, and the BMS 20 is numbered to allow the BMU 10 to recognize which BMS 20 it is connected to. However, as the number of connected BMSs 20 increases, the number of first connectors 12 also increases.

[0039] In contrast to this, in this embodiment, by using a daisy chain connection as the wire connection method between the connectors, it is possible to reduce the number of first connectors 12 to one (1:N connection) (the number of connectors on the BMU 10 side can be reduced). In this way, in this embodiment, a connection method that can improve design efficiency is realized regarding the ID setting method for 1:N connection.

[0040] As described above, this embodiment has the following advantages: (1) According to this embodiment, ID information is set according to the connection state of each pin while employing a daisy chain connection, so that ID information can be set efficiently while reducing costs.

[0041] (2) According to this embodiment, the multiple BMSs 20 are devices with the same configuration, so they can be designed in common. The top BMS 20 (20-1) in Figure 1 does not have a pull-up resistor 23, so it would be possible to eliminate the pull-up resistor 23. However, doing so would result in the board itself becoming a separate board, making management more complicated. For this reason, the design concept of having all the multiple BMSs 20 have the same configuration is adopted.

[0042] (3) According to this embodiment, the first voltage section is the ground 13 and the second voltage section is the pull-up resistor 23, so that the configuration of the BMU 10 can be simplified.

[0043] (4) According to this embodiment, the first device is the BMU 10 (battery management unit) and the second device is the BMS 20 (battery management system), so that the battery-related system can be efficiently controlled.

[0044] (5) When multiple BMSs 20 are to be connected to the BMU 10, the BMU 10 needs to assign ID information to each BMS 20 in order to know which BMS 20 it is connected to. The method of assigning ID information to each BMS 20 is to set the ID information using a combination of "0" and "1" signals, but since the BMSs 20 themselves are common to each BMS 20, each BMS 20 sets the ID information using the method of connecting to the BMU 10.

[0045] In the comparative example, the identification information setting system 100A provides a first connector 12 on the BMU 10 side for each BMS 20, and a one-to-one connector connection is established, with the connector wiring appropriate for the ID information of each BMS 20. When the number of connected BMSs 20 changes due to a specification change, the BMU 10, which is the controlling entity, must be revised. Furthermore, if the design takes into account the addition of BMSs 20 in advance, it is necessary to prepare first connectors 12 according to the expected number of BMSs 20 and secure mounting space for the first connectors 12 within the BMU 10, which is not economical or efficient in terms of designing the BMU 10. Thus, the comparative example, the identification information setting system 100A, lacks flexibility and efficiency in the design of the BMU 10, which is the upper board, for connecting N BMSs 20.

[0046] In contrast, in this embodiment, the connection between the BMU 10 and each BMS 20 via the wire harness 30 is made in a daisy chain connection as shown in Figure 1 or Figure 2, so that there is only one first connector 12 on the BMU 10 side, and there is no need to change the design of the BMU 10 depending on the number of BMS 20 connected.

[0047] This provides the following advantages: (a) By providing a predetermined number (the number of bits) of ID terminal pins 12a, 12b, etc. for one first connector 12 on the BMU 10 side, it becomes possible to flexibly accommodate the expansion of BMSs 20. Note that if the number of ID terminal pins on the BMU 10 side is N, the number of BMSs 20 that can be expanded is 2. Ｎ (b) Since the ID terminal pins 12a, 12b, etc. on the BMU 10 side are only connected to ground, there is no risk of making mistakes in the ID terminal connection design on the BMU 10 side. (c) Since there is no need to prepare a first connector 12 for each BMS 20 on the BMU 10 side, design changes to the BMU 10 when adding a BMS 20 are reduced, and high-density packaging is possible because there is no need to consider unnecessary connector space. (d) Cost reductions are expected because there is no need to prepare unnecessary first connectors 12 on the BMU 10 side.

[0048] (6) Comparison with the above-mentioned patent documents is as follows. The technology of this embodiment is a technology that reduces the number of connectors on the BMU 10 side by connecting the connectors between the BMU 10 and the BMS 20 in a daisy chain fashion. On the other hand, the technology of Patent Document 1 is a bus connection technology, but the connections are changed depending on the type of data, resulting in a reduction in the number of connectors. However, the technology of this embodiment is a different technology, as the daisy chaining is an essential element. Furthermore, the technology of Patent Document 2 is a technology related to a connection method, but this technology also changes the connection method depending on the type of data to transfer data bidirectionally, and is therefore also a technology different from the technology of this embodiment. Furthermore, the technology of Patent Document 3, like the technology of Patent Document 2, is a technology that changes the connection method depending on the data type, and is therefore a technology different from the technology of this embodiment.

[0049] [Modifications] The present disclosure can be implemented in various modifications without being limited to the above-described embodiment. (1) Although the first device is the BMU 10 and the second device is the BMS 20, the present disclosure is not limited to this example. Regardless of the battery management system, the present disclosure can be applied to any system configuration in which a first device equipped with a microcomputer and a second device equipped with a microcomputer need to identify the ID information of the second device and communicate with each other. Furthermore, the communication method is not limited to CAN, and any communication method capable of identifying ID information can be used. (2) The "predetermined number" indicating the number of ID terminal pins (CANID, first pin) of the BMU 10 (= the number of ID terminal pins (CANID, second pin) of the BMS 20 = the number of PASS terminal pins (PASS, third pin) of the BMS 20) is described as "2" in FIG. 1 and "3" in FIG. 2 , but the present disclosure can also be applied to a number of "1" or "4" or more. For example, if the "predetermined number" is "1", up to two BMSs 20 can be connected to one BMU 10, and if the "predetermined number" is "4", up to 16 BMSs 20 can be connected to one BMU 10. (3) At least one of the multiple second devices may have a different configuration. (4) The first voltage unit may be a pull-up resistor, and the second voltage unit may be ground.

[0050] [Example Problem of the Present Disclosure] Various conventional techniques have been proposed, but there is a demand for an identification information setting system that can efficiently set identification information while reducing costs.

[0051] Therefore, an exemplary object of the present disclosure is to provide an identification information setting system that can efficiently set identification information while reducing costs.

[0052] It should be noted that the present disclosure is merely an example and is not limited thereto. Furthermore, the present disclosure may be a disclosure including at least one of the specific matters set forth in the present disclosure. Furthermore, each specific matter set forth in the present disclosure may be sub-conceptualized by adding an element that limits the specific matter, or may be sub-conceptualized by deleting an element that limits the specific matter.

[0053] [Example Effects of the Present Disclosure] According to the present disclosure, it is possible to provide an identification information setting system that can efficiently set identification information while reducing costs.

[0054] 10 BMU 11 First control unit 12 First connector 12a, 12b, 12c ID terminal pin 13 Ground 20, 20-1 to 20-7 BMS 21 Second control unit 22 Second connector 22a, 22b, 22c ID terminal pin 22x, 22y, 22z PASS terminal pin 23 Pull-up resistor 30 Wire harness 100 Identification information setting system

Claims

1. An identification information setting system comprising: a first device having a first control unit and a first connector; a plurality of second devices having a second control unit and a second connector; and a connecting member connecting the first device and the plurality of second devices, wherein the first connector has a predetermined number of first pins connected to a first voltage unit; the second connector has the predetermined number of second pins connected to a second voltage unit having a voltage different from that of the first voltage unit, and the predetermined number of pins are third pins not electrically connected to the first device, and the connecting member connects the first connector and each second connector of the plurality of second devices in a daisy chain manner, connecting the first pins and the second pins at parts where it is desired to set components of identification information used for communication between the first control unit and the second control unit to specific values, and connecting the first pins and the third pins at parts where it is desired to set the components to a non-specific value different from the specific values.

2. An identification information setting system according to claim 1, wherein each of the plurality of second devices has the same configuration.

3. An identification information setting system according to claim 1, wherein the first voltage section is ground, and the second voltage section is a pull-up resistor.

4. An identification information setting system according to claim 1, wherein the first device is a battery management unit, and the second device is a battery management system.

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