Circuit board of battery monitoring system, and power supply system

Abstract

To provide a circuit board of a battery monitoring system capable of performing efficient inspection, a power supply system, and a power supply control system.SOLUTION: A slave unit board 36 used for a battery monitoring system 2 for monitoring a battery state of an assembled battery 20 includes: a slave unit antenna 34; a slave unit side wireless IC32 for transmitting or receiving the battery state by performing wireless communication via the slave unit antenna; and an inspection land 38 configured to be connectable to an electric path between the slave unit side wireless IC32 and a slave unit antenna 32 and configured to be electrically connectable to an inspection terminal 38a. An inspection device 100 performs wired communication with the slave unit side wireless IC32 via the inspection terminal 38a and the inspection land 38, and inspects wired communication.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a circuit board for a battery monitoring system, a power supply system, and a power supply control system. [Background technology]

[0002] In recent years, there have been battery monitoring systems that transmit or receive battery status information via wireless communication. Such a battery monitoring system is described in, for example, Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-127318 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in such a battery monitoring system, at a specific timing such as during prototyping or shipment, it is necessary to check whether the communication path is normal, i.e., whether the battery status can be transmitted and received normally.

[0005] However, compared to wired communication, wireless communication is more susceptible to malfunctions and problems due to various factors such as external noise. For this reason, it is considered efficient to conduct tests of antenna characteristics in advance in addition to testing the electrical path between the wireless IC and wireless antenna.

[0006] The present invention has been made in consideration of the above circumstances, and its main object is to provide a circuit board for a battery monitoring system, a power supply system, and a power supply control system that are capable of performing efficient testing. [Means for solving the problem]

[0007] The circuit board of a battery monitoring system for solving the above problem is a circuit board of a battery monitoring system used in a battery monitoring system that monitors the battery status of a battery unit, and is provided with a wireless antenna, a wireless unit that transmits or receives the battery status by wireless communication via the wireless antenna, and a connecting conductor that is configured to be connectable to an electrical path between the wireless unit and the wireless antenna and to which an inspection terminal can be electrically connected.

[0008] This allows various signals to be input and output from the middle of the electrical path via the connecting conductor, which allows the test objects to be separated and the test to be performed efficiently.

[0009] A power supply system for solving the above problem is a power supply system having a battery monitoring device that detects the battery status of a battery unit, and a battery control device that communicates wirelessly with the battery monitoring device to obtain the battery status detected by the battery monitoring device and manages the battery unit based on the battery status, wherein the circuit board of the battery control device and the circuit board of the battery monitoring device are each provided with a wireless antenna, a wireless unit that communicates wirelessly via the wireless antenna to transmit or receive the battery status, and a connecting conductor that is configured to be connectable to an electrical path between the wireless unit and the wireless antenna and to which an inspection terminal can be electrically connected, and a connector for wired connection to an external device is provided on one of the two ends of the circuit board of the battery control device, and the wireless antenna is located on the other side.

[0010] This allows various signals to be input and output from the middle of the electrical path via the connecting conductor, which allows the test objects to be separated and the test to be performed efficiently.

[0011] Furthermore, since a connector is provided on one of both ends of the circuit board and a wireless antenna is disposed on the other end, the connector can be prevented from becoming an obstacle to radio waves from the wireless antenna.

[0012] A power supply control system for solving the above problem includes a power supply system having a battery unit, a battery monitoring device that detects a battery state of the battery unit, a battery control device that wirelessly communicates with the battery monitoring device to obtain the battery state detected by the battery monitoring device and manages the battery unit based on the battery state, and a power conversion device that is connected to the power supply system and has a switching element that converts power from the power supply system or switches between energization and cut-off of energization, and the circuit board of the battery control device and the circuit board of the battery monitoring device are provided with a wireless antenna, a wireless unit that wirelessly communicates with the wireless antenna to transmit or receive the battery state, and an electrical connection between the wireless unit and the wireless antenna. and a connecting conductor configured to be connectable to a path and to which an inspection terminal can be electrically connected, and a front-end portion is arranged in the electrical path between the radio unit and the radio antenna, and at least one of the circuit board of the battery control device and the circuit board of the battery monitoring device is connected to a bus bar that connects the battery unit and an electrical load, and in order to make the intensity of noise flowing from the bus bar to the front-end portion of the circuit board equal to or lower than the current value or voltage value of the current flowing through the front-end portion, the power conversion device is connected to the ground member in the power conversion device so as to allow noise generated by the on / off control of the switching element to escape to the ground member.

[0013] This allows various signals to be input and output from the middle of the electrical path via the connecting conductor. This allows the test objects to be separated, making the test more efficient. It also reduces noise that enters through the bus bar. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram of a vehicle. [Diagram 2] FIG. 2 is a block diagram showing the configuration of a battery pack. [Diagram 3] FIG. 2 is a plan view illustrating a circuit arrangement in the battery monitoring device. [Figure 4]FIG. 2 is a plan view illustrating a circuit arrangement in the battery control device. [Diagram 5] FIG. 2 is a diagram showing the internal arrangement of a battery pack. [Figure 6] FIG. 2 is a diagram showing a configuration of a front-end circuit. [Figure 7] FIG. 13 is a plan view illustrating a battery monitoring device according to a modified example. [Figure 8] 13 is a cross-sectional view illustrating a battery monitoring device according to a modified example. [Figure 9] FIG. 13 is a plan view illustrating a battery monitoring device according to a modified example. [Figure 10] FIG. 13 is a diagram showing a battery pack according to a modified example. [Figure 11] 13 is a cross-sectional view illustrating a battery monitoring device according to a modified example. [Figure 12] FIG. 13 is a plan view illustrating a battery monitoring device according to a modified example. [Figure 13] FIG. 13 is a diagram showing an arrangement inside a battery pack according to a modified example. [Figure 14] FIG. 13 is a plan view showing a housing of a modified example. [Figure 15] FIG. 13 is a side view showing a housing of a modified example. [Figure 16] FIG. 13 is a plan view illustrating a circuit arrangement in a battery control device according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, embodiments of a circuit board, a power supply system, and a power supply control system used in a battery monitoring system according to the present disclosure will be described in detail with reference to the drawings. Note that the same or corresponding parts in the drawings are given the same reference numerals, and in principle, the description thereof will not be repeated. Hereinafter, an embodiment applied to a vehicle will be described, but the system can also be applied to applications other than vehicles.

[0016] <Overall vehicle configuration> FIG. 1 is a diagram showing a schematic configuration of a vehicle 10. The vehicle 10 includes a battery pack 11 (shown as "Battery" in FIG. 1), a power control unit (hereinafter, shown as "PCU (Power Control Unit)") 12 as a power conversion device, a motor 13 (shown as "MG" in FIG. 1) as an electric load, and a vehicle ECU 14 (shown as "ECU" in FIG. 1). In this embodiment, the battery pack 11 and the PCU 12 configure a power supply control system 1. A bus bar 16 (electrical path) between the PCU 12 and the battery pack 11 is provided with a relay switch 15 (shown as "SMR" in FIG. 1) that switches between energization and de-energization of the bus bar 16, and the power supply control system 1 may include the relay switch 15. The power conversion device may include the relay switch 15.

[0017] The battery pack 11 is mounted on the vehicle 10 as a driving power source for the vehicle 10. In Fig. 1, the battery pack 11 is installed in an engine compartment of the vehicle 10, but it may be installed in other locations, such as in a trunk, under a seat, or under a floor. The vehicle 10 is an electric vehicle or a hybrid vehicle that runs using power stored in the battery pack 11.

[0018] The battery pack 11 includes an assembled battery 20 including a large number of battery cells 22 (unit batteries). The battery cells 22 are secondary batteries, for example, lithium ion batteries. The battery pack 11 stores power for driving the motor 13 in the assembled battery 20, and can supply power to the motor 13 via the PCU 12. The battery pack 11 is also charged by receiving power generated by the motor 13 via the PCU 12 during regenerative power generation by the motor 13, such as during vehicle braking. In this embodiment, the assembled battery 20 corresponds to the battery section.

[0019] The battery pack 11 is also provided with a battery monitoring device 30 that monitors the assembled battery 20 and a battery control device 40 that controls the battery monitoring device 30. That is, the battery pack 11 of this embodiment corresponds to a power supply system including the assembled battery 20, the battery monitoring device 30, and the battery control device 40. The battery monitoring device 30 and the battery control device 40 correspond to a battery monitoring system 2. The configurations of the battery monitoring device 30 and the battery control device 40 will be described later.

[0020] The PCU 12 performs bidirectional power conversion between the battery pack 11 and the motor 13 in accordance with a control signal from the vehicle ECU 14. The PCU 12 includes, for example, an inverter that drives the motor 13, and a converter that boosts the DC voltage supplied to the inverter to an output voltage of the battery pack 11 or higher.

[0021] The motor 13 is an AC rotating electric machine, for example a three-phase AC synchronous motor with a permanent magnet embedded in the rotor. The motor 13 is driven by the PCU 12 to generate a rotational driving force, and the driving force generated by the motor 13 is transmitted to the driving wheels. On the other hand, when the vehicle 10 is braked, the motor 13 operates as a generator and performs regenerative power generation. The electric power generated by the motor 13 is supplied to the battery pack 11 via the PCU 12 and stored in the battery pack 20 in the battery pack 11.

[0022] The vehicle ECU 14 includes a CPU, a ROM, a RAM, input / output ports for inputting and outputting various signals, etc. The CPU loads a program stored in the ROM into the RAM and executes it. The program stored in the ROM describes the processing of the vehicle ECU 14. As an example of the main processing of the vehicle ECU 14, the vehicle ECU 14 receives information such as the voltage, current, and SOC (State Of Charge) of the battery pack 20 from the battery pack 11, and controls the PCU 12 to instruct the driving of the motor 13 and the charging and discharging of the battery pack 11.

[0023] <Battery pack> Fig. 2 is a diagram showing a schematic configuration of the battery pack 11, and Fig. 5 is a cross-sectional view showing a schematic arrangement of the internal configuration of the battery pack 11. The battery pack 11 includes a battery pack 20, a plurality of battery monitoring devices 30, a battery control device 40, and a housing 50 (shown in Fig. 5) that houses them. In this embodiment, the battery control device 40 is housed inside the housing 50, but it may be disposed outside the housing 50. Also, the battery pack 20 and the battery monitoring system 2 may be directly attached to a vehicle frame or the like without including the housing 50. That is, the vehicle frame may replace the housing 50.

[0024] <Battery assembly configuration> The assembled battery 20 includes a plurality of battery blocks 21 (sometimes referred to as battery stacks or battery modules). The assembled battery 20 is configured by connecting the plurality of battery blocks 21 in series and / or parallel. Each battery block 21 includes a plurality of battery cells 22. Each battery cell 22 is configured by a lithium ion secondary battery, a nickel-hydrogen secondary battery, or the like. The lithium ion secondary battery is a secondary battery that uses lithium as a charge carrier, and may include not only a general lithium ion secondary battery with a liquid electrolyte, but also a so-called all-solid-state battery that uses a solid electrolyte. The plurality of battery cells 22 are connected in series and / or parallel to configure the battery block 21. It is optional whether or not to provide the battery block 21, and the assembled battery 20 may be configured by connecting the plurality of battery cells 22 in series and / or parallel.

[0025] <Battery monitoring device> The battery monitoring device 30 is also called a satellite battery module (SBM), and is provided for each battery block 21, that is, for each of a plurality of battery cells 22. As shown in Fig. 2, each battery monitoring device 30 includes a monitoring IC 31 as a monitoring section, a child device side wireless IC 32 as a wireless section, a child device side front-end circuit 33 as a front-end section, a child device side wireless antenna 34, an equalization circuit 35, a child device side circuit board 36, and the like. Hereinafter, the child device side wireless IC 32 may be simply referred to as the child device 32, the child device side wireless antenna 34 may be referred to as the child device antenna 34, and the child device side circuit board 36 may be referred to as the child device board 36.

[0026] The monitoring IC 31, also called a cell monitoring circuit, acquires battery information of each battery cell 22 constituting the battery block 21. The battery information includes, for example, voltage information, temperature information, current information, etc. of each battery cell 22. Note that the battery monitoring device 30 may monitor each battery cell 22 or the entire battery pack 20.

[0027] The slave device 32 is connected to the monitoring IC 31 by wire. The slave device 32 is connected to the slave device antenna 34 by wire via a slave device side front-end circuit 33 as a front-end part. The slave device side front-end circuit 33 performs a demodulation process for extracting a signal carried on the radio wave received by the slave device antenna 34, and a modulation process for carrying a signal on the radio wave to be transmitted from the slave device antenna 34 to the outside. For example, as shown in FIG. 6, the slave device side front-end circuit 33 is composed of a plurality of electronic components 61a to 61e. Note that FIG. 6 is an example of the slave device side front-end circuit 33, and the number, type, arrangement, etc. of the electronic components 61a to 61e may be changed arbitrarily.

[0028] The slave device 32 wirelessly transmits data (including control signals, etc.) received from the monitoring IC 31 via the slave device side front-end circuit 33 and the slave device antenna 34. In addition, the slave device 32 transmits data received via the slave device antenna 34 and the slave device side front-end circuit 33 to the monitoring IC 31.

[0029] The equalization circuit 35 is a circuit for discharging each battery cell 22 according to an instruction from the monitoring IC 31 or the battery control device 40, and equalizing the voltage of each battery cell 22.

[0030] These electronic components (monitoring IC 31, slave unit 32, slave unit side front-end circuit 33, slave unit antenna 34, equalization circuit 35, etc.) are mounted on the slave unit board 36, and are housed and fixed inside the housing 50 as the battery monitoring device 30.

[0031] <Battery control device> The battery control device 40 is also called a battery ECU or a BMU (Battery Management Unit). The battery control device 40 is configured to be able to wirelessly communicate with each battery monitoring device 30.

[0032] 2, the battery control device 40 includes a battery control MCU 41 as a battery control unit, a parent unit side wireless IC 42 as a wireless unit, a parent unit side front-end circuit 43 as a front-end unit, a parent unit side wireless antenna 44, a measurement circuit 45 as a measurement unit, and a parent unit side circuit board 46. In the following, the parent unit side wireless IC 42 may be simply referred to as the parent unit 42, the parent unit side wireless antenna 44 may be referred to as the parent unit antenna 44, and the parent unit side circuit board 46 may be referred to as the parent unit board 46.

[0033] The battery control MCU 41 is composed of a microcontroller unit (microcontroller unit) including a CPU, ROM, RAM, an input / output interface, etc. The CPU of the battery control MCU 41 loads a program stored in the ROM into the RAM and executes it. The program stored in the ROM describes the processing related to battery control.

[0034] As an example of the main process, the battery control MCU 41 instructs the battery monitoring device 30 to acquire and transmit battery information. The battery control MCU 41 also monitors the assembled battery 20, the battery block 21, and the battery cells 22 based on the battery information received from the battery monitoring device 30. The battery control MCU 41 also controls the relay switch 15 (power conversion device) that switches between the energized and de-energized states of the assembled battery 20 and the PCU 12 and the motor 13 based on the monitoring results. The battery control MCU 41 may also transmit an equalization signal that equalizes the voltages of the battery cells 22. In this embodiment, the vehicle ECU 14 issues an instruction to the PCU 12 to control the charging and discharging of the assembled battery 20, but the battery control MCU 41 may be configured to be able to do so. As described above, the battery control MCU 41 manages the assembled battery 20, the battery block 21, and the battery cells 22.

[0035] The parent device 42 is connected to the battery control MCU 41 by wire. The parent device 42 is also connected to a parent device antenna 44 by wire via a parent device side front-end circuit 43 serving as a front-end unit. The parent device side front-end circuit 43 performs demodulation processing, modulation processing, and the like, similar to the child device side front-end circuit 33, and is composed of a plurality of electronic components 61a to 61e as shown in FIG. 6.

[0036] The parent unit 42 wirelessly transmits the data received from the battery control MCU 41 via the parent unit side front-end circuit 43 and the parent unit antenna 44. In addition, the parent unit 42 sends the data received via the parent unit antenna 44 and the parent unit side front-end circuit 43 to the battery control MCU 41.

[0037] The measuring circuit 45 is connected between the terminals of the battery pack 20, and is a circuit that measures the terminal voltage (total voltage) of the battery pack 20, leakage current, etc. The voltage of the battery block 21 may also be measured.

[0038] These electronic components (battery control MCU 41, parent unit 42, parent unit side front-end circuit 43, parent unit antenna 44, measurement circuit 45, etc.) are mounted on the parent unit board 46, and are housed and fixed inside the housing 50 as the battery control device 40.

[0039] <Case> The housing 50 is made of a conductor such as metal. The housing 50 is formed in a metal box shape, and has a substantially rectangular parallelepiped shape. The housing 50 may be made of a non-conductive material such as resin. The housing 50 houses the battery pack 20, the battery monitoring device 30, and the battery control device 40.

[0040] Incidentally, at a predetermined timing, such as during the prototyping of the battery pack 11, it is necessary to inspect whether the battery control device 40 and the battery monitoring device 30 are operating normally. In wireless communication, inspections that are not performed in wired communication, such as inspection of antenna characteristics, are expected. For this reason, it is considered efficient to perform the inspections by dividing them into several configurations. Therefore, in this embodiment, the following circuit configuration is adopted. A detailed description will be given.

[0041] Figure 3 is a plan view of the slave board 36, showing generally the electronic components that make up the battery monitoring device 30 and their arrangement on the slave board 36, and Figure 4 is a plan view of the master board 46, showing generally the electronic components that make up the battery control device 40 and their arrangement on the master board 46.

[0042] <Shape and circuit layout of child unit board> As shown in Fig. 3, the slave board 36 has a horizontally long rectangular shape, and round holes 37A to 37D are provided near each corner as fastening parts for fixing the slave board 36 to the housing 50. In Fig. 3, electronic components such as the monitoring IC 31, the power supply 81 for the monitoring IC, and the power supply 82 for the wireless IC are mounted near the center of the slave board 36, electronic components such as the equalizing circuit 35 are mounted on the left side of the slave board 36, and electronic components such as the slave 32, the slave side front-end circuit 33, and the slave antenna 34 are mounted on the right side of the slave board 36. In Fig. 3, a connector 31a to be connected to the battery cell 22 is attached to the left end of the slave board 36. The monitoring IC 31 is connected to the battery cell 22 via the connector 31a, and is configured to be able to detect the battery state (battery information) of the battery cell 22.

[0043] The child device board 36 is a printed circuit board, and is covered with a conductor pattern (wiring pattern) (not shown), and the electronic components are connected to each other by the conductor pattern. Although not shown, electronic components other than the above electronic components are also arranged. The electronic components include, for example, various electronic circuits and various circuit elements (capacitors, switching elements, resistors, etc.). The monitoring IC power supply 81 and the wireless IC power supply 82 are power conversion circuits serving as electronic components that convert power supplied from a battery (such as the assembled battery 20 which is the main battery) and supply it to the monitoring IC 31 and the child device 32.

[0044] As shown in FIG. 2, the handset side front-end circuit 33 is disposed in the electrical path between the handset 32 ​​and the handset antenna 34. The electrical path from the handset side front-end circuit 33 to the handset antenna 34 is configured to be connectable to an inspection land 38. The inspection land 38 is an annular copper foil portion (connection conductor) provided around a circular hole (through hole) provided in the handset board 36. As shown in FIG. 2, a pin-shaped inspection terminal 38a is inserted into the inspection land 38 to be electrically connected. In this embodiment, the inspection terminal 38a is illustrated as a pin terminal, but the shape of the inspection terminal 38a is arbitrary.

[0045] As long as the inspection lands 38 and the inspection terminals 38a are electrically connected, the connection mode may be changed as desired. For example, the inspection terminals 38a may be directly contacted with the inspection lands 38, or may be fixed by soldering. Also, the connection may be made using a coaxial connector for connecting a coaxial cable.

[0046] A connection terminal of the external inspection device 100 is connected to the inspection terminal 38a, and is configured to be able to transmit and receive various inspection information (data and signals) to the child device 32 via the inspection terminal 38a and the inspection land 38. As shown in Fig. 2, a path changeover switch 39 (not shown in Fig. 3) is provided between the inspection land 38 and a connection point in the electrical path from the child device side front-end circuit 33 to the child device antenna 34. By switching this path changeover switch 39, the inspection land 38 can be connected to the electrical path from the child device side front-end circuit 33 to the child device antenna 34.

[0047] As shown in FIG. 5, the child device antenna 34 is disposed on the side of the battery control device 40 opposite to the inner wall of the housing 50.

[0048] The circular holes 37A to 37D provided near each corner of the child device board 36 are connected to the housing 50, which is a grounding member, to ground the circuit. When grounding, it is preferable to ground the surface opposite to the surface on which the child device antenna 34 and the inspection land 38 are arranged. As a result, the child device board 36 is provided with a high-voltage area 36a that handles high voltages (e.g., several hundred V) and a low-voltage area 36b that handles low voltages (e.g., several tens of V) compared to the high-voltage area 36a. The child device 32, the child device side front-end circuit 33, the child device antenna 34, the equalization circuit 35, etc. are arranged in the high-voltage area 36a of the child device board 36. On the other hand, the low-voltage area 36b of the child device board 36 is provided around the circular holes 37A to 37D that are fixed to the housing 50. The low-voltage area 36b (the conductor pattern of the low-voltage area 36b) is grounded to the housing 50 via the circular holes 37A to 37D. In this embodiment, all of the round holes 37A to 37D are grounded, but only one of the round holes 37A to 37D may be grounded.

[0049] Between the low voltage region 36b and the high voltage region 36a, a boundary 36c is provided to separate and insulate the low voltage region 36b from the high voltage region 36a. An electrical path L31 is provided on the boundary 36c to ground the electrical circuit provided in the high voltage region 36a to a ground member (housing 50) via round holes 37A-37D provided in the low voltage region 36b. A common capacitor 36d is provided on the electrical path L31 to remove common noise and the like generated in the high voltage region 36a and release it to the ground member (housing 50) via the round holes 37A-37D.

[0050] Further, the high-voltage region 36a of the child device board 36 is defined by electronic components and electrical paths (conductor patterns) through which a high-voltage current flows, and at least the region around the electronic components and electrical paths through which the high-voltage current flows is the high-voltage region 36a. Similarly, the low-voltage region 36b of the child device board 36 is defined by electronic components and electrical paths (conductor patterns) through which a low-voltage current flows compared to the current flowing in the high-voltage region 36a, and at least the region around the electronic components and electrical paths through which the low-voltage current flows is the low-voltage region 36b.

[0051] Moreover, the boundary 36c is an insulating region, and is a region where no electrical path is arranged except for the electrical path L31 connecting the high voltage region 36a and the low voltage region 36b. Note that the boundary 36c is illustrated by hatching in Fig. 3. As shown in Fig. 3, it is desirable that the boundary 36c has a certain width so that the high voltage region 36a and the low voltage region 36b are sufficiently separated from each other.

[0052] Incidentally, the inspection land 38 is mainly used for inspection at the prototype stage, and is often not used (but may be used) at the mass production stage. For this reason, the inspection terminal 38a is not attached to the mass production product, and the conductor (copper foil portion) is exposed. In such a case, if the inspection land 38 arranged in the high voltage area 36a of the child device board 36 is arranged in a position close to the low voltage area 36b of the child device board 36 or in a position close to the inner wall of the housing 50 which has the same potential as the low voltage area 36b, there is an increased possibility of dielectric breakdown occurring between the low voltage area 36b (or the housing 50) depending on the potential difference. In other words, there is a risk that the electrical path provided in the high voltage area 36a of the child device board 36 will be short-circuited with the electrical path provided in the low voltage area 36b (or the housing 50) via the inspection land 38.

[0053] Therefore, the inspection land 38 of this embodiment is disposed farther from the low-voltage area 36b than the electronic component closest to the low-voltage area 36b (or the housing 50). For example, the inspection land 38 is disposed farther from the upper right round hole 37A than the child device side front-end circuit 33 closest to the round hole 37A. That is, any of the electronic components 61a to 61e constituting the child device side front-end circuit 33 is disposed between the upper right round hole 37A (and the low-voltage area 36b around it) and the inspection land 38 in FIG. It can also be said that the child device side front-end circuit 33 is provided between the boundary 36c and the inspection land 38. Similarly, the child device 32 is disposed between the lower right round hole 37B (and the low-voltage area 36b around it) and the inspection land 38 in FIG. Similarly, the equalization circuit 35 and the like are disposed between the upper left or lower left round holes 37C, 37D (and the low-voltage areas 36b around them) and the inspection land 38 in FIG.

[0054] Moreover, the child device antenna 34 is easily affected by heat. For this reason, one of the child device antenna 34 and the equalizing circuit 35 is disposed on the outer edge side of the child device board 36, and the other is disposed on the central side of the child device board 36. Specifically, the child device antenna 34 is disposed near the left end of the child device board 36, and the equalizing circuit 35 is disposed near the center. It is preferable that the child device antenna 34 is also sufficiently separated from the monitoring IC power supply 81 and the wireless IC power supply 82, which may be heat sources.

[0055] Moreover, the child device board 36 is fixed to the housing 50 by screws or the like through the round holes 37A to 37D. Therefore, stress is applied to the vicinity of the round holes 37A to 37D by the screws or the like. When stress is applied, the child device board 36 is distorted, and the impedance of the circuit and the wireless antenna changes accordingly, which may affect the frequency characteristics of the radio waves and currents. For this reason, it is desirable that the child device antenna 34 and the inspection land 38 are spaced apart from the round holes 37A to 37D by a predetermined distance or more. Therefore, the round holes 37A to 37D are arranged near each corner of the child device board 36, and the child device antenna 34 and the inspection land 38 are arranged inside the child device board 36.

[0056] In addition, since the device is fixed to the housing 50 by screws or the like through the multiple circular holes 37A-37D, the straight lines connecting the circular holes 37A-37D are also susceptible to stress and distortion. For this reason, it is desirable to arrange the child device antenna 34 and the inspection lands 38 so as to avoid the straight lines connecting the circular holes 37A-37D. In this embodiment, the inspection lands 38 are arranged so as to avoid the straight lines connecting the circular holes 37A-37D.

[0057] The slave board 36 is accommodated in the housing 50, and as shown in FIG. 5, the outer edge of the slave board 36 faces the inner wall of the housing 50 and is disposed close to the inner wall. That is, there is not much of a gap between the outer edge of the slave board 36 and the inner wall of the housing 50. For this reason, the test land 38 is disposed on the inside of the slave board 36 relative to the slave antenna 34 so as to be farther from the inner wall of the housing 50 than the slave antenna 34. That is, even when the battery monitoring device 30 is accommodated in the housing 50, the test terminal 38a can be easily inserted and removed from the test land 38 without being obstructed by the inner wall of the housing 50.

[0058] Incidentally, the radiation pattern (pattern of radiation intensity of radiated radio waves) of the child device antenna 34 is often not uniform in the circumferential direction. This is natural when a directional antenna is adopted as the child device antenna 34, but even in a non-directional antenna, the radiation pattern is slightly different depending on the circuit arrangement, etc. Furthermore, when the communication space is narrow, such as inside the housing 50, the radiation pattern is likely to change due to interference, etc. Furthermore, since the inspection land 38 is a conductor as described above, there is a possibility that they may affect each other. For example, the inspection land 38 may cause noise to occur in radio waves (wireless communication). Furthermore, during inspection, noise based on radio waves from the child device antenna 34 may occur in the circuit of the battery monitoring device 30 via the inspection land 38.

[0059] Therefore, the inspection land 38 is provided outside a predetermined range centered on the direction in which the radiation intensity of the radio wave radiated from the child device antenna 34 is strongest. In FIG. 3, the direction in which the radiation intensity of the radio wave radiated from the child device antenna 34 is strongest is indicated by an arrow Y1, and the predetermined range is indicated by a dashed line. The predetermined range may be set within a range of 0 degrees to 180 degrees, and preferably outside a range of 30 degrees to 90 degrees. In this embodiment, a range of 90 degrees centered on the direction in which the radiation intensity of the radio wave radiated from the child device antenna 34 is strongest is set as the predetermined range. When wireless communication is performed between the parent device 42 and the child device 32, the direction connecting the parent device antenna 44 and the child device antenna 34 is generally highly likely to be the direction in which the radiation intensity of the radio wave is strongest.

[0060] Furthermore, the child device antenna 34 and the inspection land 38 may be disposed so as to face metal parts provided on the housing 50 or the case of the assembled battery 20. In other words, in a predetermined direction, the child device antenna 34 and the inspection land 38 may be covered by metal parts provided on the housing 50 or the case of the assembled battery 20. This allows the metal parts to function as an electromagnetic shield, suppressing the effects of external noise.

[0061] <Master board shape and circuit layout> Next, the shape and circuit arrangement of the parent board 46 will be described. As shown in Fig. 4, the parent board 46 has a horizontally long rectangular shape, and round holes 47A to 47D are provided near each corner as fastening parts for fixing the parent board 46 to the housing 50. As shown in Fig. 4, the measurement circuit 45 and the like are mounted on the right side of the parent board 46, the battery control MCU 41, the power supply 83 for the battery control MCU, and the power supply 84 for the wireless IC are mounted near the center, and the parent unit 42, the parent unit side front-end circuit 43, the parent unit antenna 44, and the like are mounted on the left side.

[0062] 4, a connector 41a that is connected to an external device such as the vehicle ECU 14 is attached to the right end of the master board 46. The battery control MCU 41 is connected to the vehicle ECU 14 via the connector 41a, and is configured to be capable of transmitting battery status (battery information) related to the battery cells 22. The battery control MCU 41 is also configured to be capable of receiving commands from the vehicle ECU 14.

[0063] The mother board 46 is a printed circuit board, similar to the daughter board 36, and the electronic components are connected to each other by a conductor pattern. Although not shown, electronic components other than the above-mentioned electronic components are also arranged. The electronic components include, for example, various electronic circuits and various circuit elements (capacitors, switching elements, resistors, etc.). In addition, the battery control MCU power supply 83 and the wireless IC power supply 84 are power conversion circuits serving as electronic components that convert power supplied from a battery (such as an auxiliary battery not shown) and supply it to the battery control MCU 41 and the parent unit 42.

[0064] 2, a parent-side front-end circuit 43 is disposed in the electrical path between the parent unit 42 and the parent unit antenna 44. An inspection land 48 is configured so as to be connectable to the electrical path from the parent-side front-end circuit 43 to the parent unit antenna 44. The inspection land 48 has a similar configuration to the inspection land 38 of the child unit board 36. A pin-shaped inspection terminal 48a is inserted into the inspection land 48 to be electrically connected. The shape of the inspection terminal 48a is arbitrary.

[0065] As long as the inspection lands 48 and the inspection terminals 48a are electrically connected, the connection mode may be changed as desired. For example, the inspection terminals 48a may be directly contacted with the inspection lands 48, or may be fixed by soldering. Also, the connection may be made using a coaxial connector for connecting a coaxial cable.

[0066] The external inspection device 100 is configured to be able to transmit and receive various types of inspection information to the parent device 42 via the parent device side front-end circuit 43 through the inspection terminal 48a and the inspection land 48. As shown in Fig. 2, a path changeover switch 49 is provided between the inspection land 48 and a connection point in the electrical path from the parent device side front-end circuit 43 to the parent device antenna 44. By switching this path changeover switch 49, the inspection land 48 can be connected to the electrical path from the parent device side front-end circuit 43 to the parent device antenna 44.

[0067] Among the round holes 47A to 47D provided at each corner of the mother board 46, a connector 45a to which the battery pack 20 is connected is disposed near the lower right round hole 47B. This connector 45a is connected to at least one of the positive terminal and the negative terminal of the battery pack 20 so as to obtain the highest potential and the lowest potential of the battery pack 20 (i.e., to obtain the inter-terminal voltage), or to obtain either one of them. That is, the connector 45a is a connector for obtaining a voltage used when detecting a dielectric breakdown (electric leakage). Accordingly, the mother board 46 is provided with a high-voltage area 46a that handles high voltages (e.g., several hundred V) and a low-voltage area 46b that handles low voltages (e.g., several tens of V). More specifically, a measuring circuit 45 that is connected to the battery pack 20 via the connector 45a is disposed in the high-voltage area 46a of the mother board 46. Meanwhile, the battery control MCU 41, the parent device 42, the parent device side front-end circuit 43, the parent device antenna 44, etc. are arranged in the low-voltage area 46b of the parent device board 46. Meanwhile, between the high-voltage area 46a and the low-voltage area 46b of the parent device board 46, a boundary 46c is provided to isolate them.

[0068] Note that the boundary 46c is provided with an electrical path L41 (indicated by a dashed line) for transmitting the detection result from the measurement circuit 45. The measurement circuit 45 acquires the voltage of the battery pack 20 through the circular hole 47B and transmits it to the battery control MCU 41 in the high voltage area 46a.

[0069] The high-voltage region 46a of the parent board 46 is determined by electronic components and electrical paths (conductor patterns) through which a high-voltage current flows, and at least the region around the electronic components and electrical paths through which a high-voltage current flows is the high-voltage region 46a. Similarly, the low-voltage region 46b of the parent board 46 is determined by electronic components and electrical paths (conductor patterns) through which a low-voltage current flows compared to the current flowing in the high-voltage region 46a, and at least the region around the electronic components and electrical paths through which a low-voltage current flows is the low-voltage region 46b.

[0070] The boundary 46c of the mother board 46 is an insulating region, and is a region where no electrical path is arranged except for the electrical path L41 connecting the high voltage region 46a and the low voltage region 46b. Note that the boundary 46c is illustrated by hatching in Fig. 4. As shown in Fig. 4, it is desirable that the boundary 46c has a certain width so that the high voltage region 46a and the low voltage region 46b are sufficiently separated from each other.

[0071] Incidentally, the inspection land 48, like the inspection land 38, is mainly used for inspection at the prototype stage, and is often not used at the mass production stage (although it may be used). For this reason, the inspection terminal 48a is not attached to the mass-produced product, and the conductor (copper foil portion) is exposed. This causes the same problem as the inspection land 38 of the child device board 36. That is, there is a risk that the high voltage area 46a and the low voltage area 46b of the parent device board 46 will be short-circuited via the inspection land 48 (or the inspection terminal 48a, the same applies below).

[0072] Therefore, the inspection lands 48 in this embodiment are arranged farther from the high voltage region 46a than the electronic component closest to the high voltage region 46a. For example, the inspection lands 48 are arranged farther from the high voltage region 46a than the parent device front-end circuit 43. In other words, other electronic components such as the parent device front-end circuit 43 are arranged between the high voltage region 46a and the inspection lands 48 in FIG.

[0073] The motherboard 46 is fixed to the housing 50 by screws or the like through the round holes 47A to 47D. Therefore, stress is applied to the vicinity of the round holes 47A to 47D by the screws or the like. When stress is applied, the motherboard 46 is distorted, and the impedance of the circuit and the wireless antenna changes accordingly, which may affect the frequency characteristics of the radio waves and currents. For this reason, it is desirable that the motherboard antenna 44 and the inspection land 48 are spaced apart from the round holes 47A to 47D by a predetermined distance or more. Therefore, the round holes 47A to 47D are arranged near each corner of the motherboard 46, and the motherboard antenna 44 and the inspection land 48 are arranged inside the motherboard 46.

[0074] In addition, since the antenna 44 is fixed to the housing 50 by screws or the like through the circular holes 47A to 47D, the straight lines connecting the circular holes 47A to 47D are also susceptible to stress and distortion. For this reason, it is desirable to arrange the parent unit antenna 44 and the inspection lands 48 so as to avoid the straight lines connecting the circular holes 47A to 47D. In this embodiment, the inspection lands 48 are arranged so as to avoid the straight lines connecting the circular holes 47A to 47D.

[0075] 5, the outer edge portion of the mother board 46 faces the inner wall of the housing 50 and is disposed close to the inner wall. That is, there is not much of a gap between the outer edge portion of the mother board 46 and the inner wall of the housing 50. Therefore, the inspection land 48 is disposed on the inside of the mother board 46 relative to the mother antenna 44 so as to be farther from the inner wall of the housing 50 than the mother antenna 44. That is, even when the battery control device 40 is housed in the housing 50, the inspection terminal 48a can be easily inserted and removed from the inspection land 48 without being obstructed by the inner wall of the housing 50.

[0076] As in the case of the child device board 36, the inspection land 48 of the parent device board 46 is provided outside a predetermined range centered on the radiation direction in which the radiation intensity of the radio wave radiated from the parent device antenna 44 is strongest. In FIG. 4, the radiation direction in which the radiation intensity of the radio wave radiated from the parent device antenna 44 is strongest is indicated by arrow Y2, and the predetermined range is indicated by a dashed line. The predetermined range may be set in the range of 0 degrees to 180 degrees, and preferably outside the range of 30 degrees to 90 degrees. In this embodiment, the predetermined range is set to a range of 90 degrees centered on the direction in which the radiation intensity of the radio wave radiated from the parent device antenna 44 is strongest.

[0077] As in the case of the child device board 36, the parent device antenna 44 and the inspection land 48 may be disposed so as to face metal parts provided on the housing 50 or the case of the battery pack 20. This allows the metal parts to function as an electromagnetic shield, suppressing the effects of external noise.

[0078] According to the above embodiment, the following effects are obtained.

[0079] The child device board 36 is provided with an inspection land 38 to which an inspection terminal 38a is connected. An external inspection device 100 is configured so that various inspection information can be transmitted and received between the child device 32 and the inspection terminal 38a and the inspection land 38. This makes it possible to input and output various signals from the middle of the electrical path via the inspection land 38. This makes it possible to separate the objects to be inspected. For example, it is possible to inspect only the antenna characteristics. This makes it possible to perform the inspection efficiently. The parent device board 46 is also provided with an inspection land 48, and the same effect as the child device board 36 can be obtained.

[0080] The inspection lands 38, 48 are arranged farther from a region other than the region in which they are arranged than the electronic component closest to that region. That is, in the region in which the inspection lands 38, 48 are arranged, electronic components are arranged between the inspection lands 38, 48 and the region other than the region in which the inspection lands 38, 48 are arranged.

[0081] For example, in the high-voltage region 36a where the inspection land 38 is arranged, any of the electronic components 61a to 61e constituting the child device side front-end circuit 33 is arranged between the inspection land 38 and the low-voltage region 36b. The inspection land 38 is arranged farther from the circular hole 37A grounded to the housing 50 than the electronic components 61a to 61e closest to the circular hole 37A. In the low-voltage region 46b where the inspection land 48 is arranged, the electronic components 61a to 61e constituting the parent device side front-end circuit 43 are arranged between the inspection land 48 and the high-voltage region 46a. This makes it possible to suppress the occurrence of dielectric breakdown between the high-voltage regions 36a, 46a and the low-voltage regions 36b, 46b via the inspection lands 38, 48.

[0082] One of the inspection land 38 and the equalization circuit 35 is disposed on the outer edge side of the child device board 36, and the other is disposed on the center side. Similarly, one of the child device antenna 34 and the equalization circuit 35 is disposed on the outer edge side of the child device board 36, and the other is disposed on the center side. In this embodiment, the inspection land 38 and the child device antenna 34 are provided on the outer edge side, and the equalization circuit 35 is provided on the center side. This makes it possible to suppress the influence of heat generated from the equalization circuit 35 on the child device antenna 34, and to suppress communication failure due to heat.

[0083] An inspection land 38 is disposed between the monitor IC 31 and a high-frequency circuit consisting of the slave unit 32, the slave unit side front-end circuit 33, and the slave unit antenna 34. This allows noise generated from the monitor IC 31 to escape to the inspection land 38. This prevents noise from being transmitted to the high-frequency circuit side and from adversely affecting the radio wave characteristics. Similarly, the influence of high-frequency noise generated from the high-frequency circuit on the monitor IC 31 can be suppressed, improving detection accuracy.

[0084] The round holes 37A-37D, 47A-47D for fixing to the housing 50 are provided at the outer edge of the child device board 36 or the parent device board 46, and the inspection lands 38, 48 are arranged inside the child device board 36 or the parent device board 46 with respect to the round holes 37A-37D, 47A-47D. This allows the inspection lands 38, 48 to be appropriately spaced from the round holes 37A-37D, 47A-47D. Therefore, when the child device board 36 or the parent device board 46 is fixed with a screw or the like, the influence of distortion caused by stress near the round holes 37A-37D, 47A-47D on the inspection lands 38, 48 can be suppressed. This suppresses changes in impedance and enables accurate inspection.

[0085] Furthermore, the inspection lands 38, 48 and the radio antennas 34, 44 are arranged to avoid being on the straight lines connecting the circular holes 37A-37D, 47A-47D. This makes it possible to prevent the influence of distortion caused by stress on the inspection lands 38, 48 and the radio antennas 34, 44 on the straight lines connecting the circular holes 37A-37D, 47A-47D. This makes it possible to prevent changes in impedance and to perform inspection with high accuracy. Also, the influence on the radio antennas 34, 44 can be suppressed.

[0086] The slave board 36 is accommodated in the housing 50, and as shown in Fig. 5, the outer edge portion of the slave board 36 is disposed facing the inner wall of the housing 50. Therefore, the inspection land 38 is disposed on the inside of the slave board 36 relative to the slave antenna 34 so as to be farther from the inner wall of the housing 50 than the slave antenna 34. This makes it easier to insert and remove the inspection terminal 38a into and from the inspection land 38 without being obstructed by the inner wall of the housing 50.

[0087] Similarly, the outer edge portion of the mother board 46 faces the inner wall of the housing 50. For this reason, the inspection lands 48 are disposed on the inner side of the mother board 46 relative to the mother antenna 44 so as to be farther from the inner wall of the housing 50 than the mother antenna 44. This makes it easier to insert and remove the inspection terminals 48a into and from the inspection lands 48.

[0088] The child device side front-end circuit 33 or the parent device side front-end circuit 43 is provided between the boundaries 36c, 46c and the inspection lands 38, 48. This makes it possible to suitably suppress dielectric breakdown.

[0089] The inspection lands 38, 48 are provided outside a 90-degree range centered on the radiation direction (Y1, Y2) in which the radiation intensity of the radio waves emitted from the wireless antennas 34, 44 is strongest. This makes it possible to reduce noise in the radio waves caused by the inspection lands 38, 48. Also, during inspection, noise due to the radio waves from the slave antenna 34 can be reduced via the inspection land 38.

[0090] The equalization circuit 35 is disposed closer to the inspection lands 38 than the child device antenna 34. This allows heat generated by the equalization circuit 35 to be dissipated via the inspection lands 38, and prevents the heat from being transmitted to the child device antenna 34. This prevents problems with wireless communication by the child device antenna 34 caused by the influence of heat.

[0091] The wireless antennas 34, 44 and the inspection lands 38, 48 may be disposed so as to face metal parts provided on the housing 50 or the case of the battery pack 20. When disposed in this manner, the metal parts function as an electromagnetic shield and can suppress external noise.

[0092] Of the multiple round holes 37A to 37D, round hole 37A closest to child device antenna 34 is arranged on a side different from the side on which child device antenna 34 is provided. That is, child device antenna 34 is arranged on the long side of child device board 36, and round hole 37A closest to child device antenna 34 is provided on the short side of child device board 36. This makes it possible to prevent the influence of distortion occurring near round hole 37A from reaching child device antenna 34.

[0093] A connector 41a for wired connection to the vehicle ECU 14, which is an external device, is provided on the right side of the parent board 46, and a parent antenna 44 is disposed on the other side. This makes it possible to prevent radio waves from the parent antenna 44 from interfering with and being blocked by the connector 41a. In other words, it is possible to prevent the connector 41a from becoming an obstacle to wireless communication.

[0094] 5, the child device antenna 34 is disposed on the right side of the child device board 36, while the parent device antenna 44 is disposed on the left side of the parent device board 46. In other words, the child device board 36 is disposed on the side of the parent device board 46 where the parent device antenna 44 is provided. This allows the distance between the parent device antenna 44 and the child device antenna 34 to be reduced and also reduces obstacles. This allows for optimal wireless communication.

[0095] (Modification) The configuration of the above embodiment may be partially modified as shown below. Modifications are shown below.

[0096] In the above embodiment, the equalizing circuit 35 may be disposed on the outer edge of the child device board 36, and the inspection land 38 may be provided near the center.

[0097] In the above embodiment, the inspection land 38 is disposed closer to the center of the child device board 36 than the round holes 37A-37D closest to the inspection land 38, but the inspection land 38 may be disposed on the side opposite to the side on which the round holes 37A-37D closest to the inspection land 38 are provided. For example, as shown in Fig. 7, if the round holes 37C and 37D are formed only on the left side of the child device board 36, the inspection land 38 may be disposed on the left side. This makes it possible to prevent the influence of distortion occurring near the round holes 37C and 37D from affecting the inspection land 38.

[0098] Similarly, the inspection land 48 may be arranged on the side opposite to the side on which the circular hole 47D closest to the inspection land 48 is provided. For example, if the circular hole is formed only on the right side of the mother board 46, the inspection land 48 may be arranged on the left side.

[0099] In the above embodiment, the equalization circuit 35 is arranged closer to the inspection land 38 than the child device antenna 34, that is, closer to the inspection land 38, but it may also be arranged closer to the child device antenna 34.

[0100] In the above embodiment, the child device board 36 may be configured so that elements and circuits can be arranged on the front and back sides. In this case, as shown in FIG. 8, the surface on which the equalizing circuit 35 is arranged may be different from the surface on which the inspection land 38 is arranged. Also, the surface on which the equalizing circuit 35 is arranged may be different from the surface on which the child device 32 is arranged. Similarly, the surface on which the equalizing circuit 35 is arranged may be different from the surface on which the child device antenna 34 is arranged. This makes it possible to suppress the heat generated by the equalizing circuit 35 from being transmitted to the child device 32 and the inspection land 38 during inspection. This allows for accurate inspection. In addition, in this configuration, it is desirable to connect to a ground member (such as a housing 50) on the side opposite to the surface on which the child device antenna 34 and the inspection land 38 are arranged. This makes it possible to suppress the transmission of noise from the ground member to the child device antenna 34 and the inspection land 38.

[0101] Similarly, the power supply 81 for the monitoring IC, which may be a heat source, may be placed on the side opposite to the wireless devices (slave side wireless IC 32, slave side front-end circuit 33, slave side wireless antenna 34). The same applies to the power supply 83 for the battery control MCU.

[0102] In the above embodiment, it is desirable that the power supplies 82, 84 for the wireless ICs are arranged at a predetermined distance from the wireless devices (slave-side wireless IC 32, slave-side front-end circuit 33, slave-side wireless antenna 34, master-side wireless IC 42, master-side front-end circuit 43, and master-side wireless antenna 44). The predetermined distance is, for example, a distance equal to or greater than the size of the power supply circuit of the power supplies 82, 84 for the wireless ICs.

[0103] In the above embodiment, after the inspection, the inspection lands 38, 48 may be sealed with a sealing member 62 made of an insulating material such as resin, as shown in Fig. 9. This makes it possible to prevent dielectric breakdown from occurring through the inspection lands 38, 48.

[0104] In the above embodiment, the inspection land 38 may be disposed so as to be spaced apart from the child device side front-end circuit 33 by a predetermined distance or more.

[0105] In the above embodiment, as shown in Fig. 2, the path changeover switch 39 is configured to connect the electrical path connected to the inspection land 38 and the electrical path connected to the child device antenna 34, but the configuration related to the connection may be changed arbitrarily. For example, a short element may be used to connect the electrical path connected to the inspection land 38 and the electrical path connected to the child device antenna 34. Alternatively, the electrical path connected to the inspection land 38 and the electrical path connected to the child device antenna 34 may both be connected to the electrical path to which the child device 32 is connected, and an electronic component (such as a bandpass filter) arranged on at least one of the electrical path connected to the inspection land 38 or the electrical path connected to the child device antenna 34 may be used to select whether or not to transmit a signal to the child device antenna 34.

[0106] Similarly, in the battery control device 40, the connection configuration between the electrical path connected to the inspection land 48 and the electrical path connected to the parent unit antenna 44 may also be changed arbitrarily.

[0107] In the battery pack 11 of the above embodiment, a cooling blower 63 that generates wind to cool the battery assembly 20 may be provided. In this case, as shown in Fig. 10, in the path of the wind generated by the cooling blower 63 (the wind direction and the wind path are indicated by arrows in the figure), the equalization circuit 35 is disposed downwind of the child device antenna 34 and the inspection land 38. In other words, the child device antenna 34 and the inspection land 38 are disposed upwind, and the equalization circuit 35 is disposed downwind. This makes it possible to prevent the heat from being transmitted to the child device antenna 34 and the inspection land 38 via the wind (air) even if the equalization circuit 35 generates heat.

[0108] In the above embodiment, the inspection land 38 was arranged between the high-frequency circuit consisting of the slave unit 32, the slave unit antenna 34, and the slave unit side front-end circuit 33, and the monitoring IC 31, but it does not have to be arranged between them.

[0109] 9, a slit 65 (groove) may be formed between a high-frequency circuit including the child device 32, the child device antenna 34, and the child device side front-end circuit 33, and between the monitoring IC 31 and the equalization circuit 35. This makes it possible to prevent the influence of high-frequency noise generated from the high-frequency circuit on the monitoring IC 31, etc., and improves detection accuracy.

[0110] In the above embodiment, as shown in Fig. 11(a), the slave board 36 of the battery monitoring device 30 was connected to the battery cell 22 via the connector 31a. More specifically, the detection line 66 connected to the battery cell 22 was connected via the connector 31a. As a variation of this, as shown in Fig. 11(b), the detection line 66 connected to the battery cell 22 may be connected to the slave board 36 of the battery monitoring device 30 by soldering. The solder joint 67 formed on the slave board 36 can be easily made lower in height than the connector 31a, so interference with radio waves transmitted and received from the slave antenna 34 can be suppressed.

[0111] In the above embodiment, the parent unit antenna 44 may be a directional antenna that emits radio waves with high radiation intensity in a predetermined radiation direction. In this case, it is preferable to provide the connector 41a on the opposite side of the radiation direction Y2 (the direction in which the radiation intensity of the radio waves is the highest) of the directional antenna, as in the case shown in Fig. 4. This makes it possible to prevent the radio waves from the parent unit antenna 44 from being blocked by the connector 41a.

[0112] In the above embodiment, as shown in Fig. 12, round holes 137B and 137D as fastening parts for fixing the child device board 36 may be provided so as to protrude from one of the sides (short sides in Fig. 12) of the child device board 36. In this case, it is preferable that the child device antenna 34 is provided on the outer edge of the child device board 36, on the side (long side in Fig. 12) on which the round holes 137B and 137D are not provided. This makes it possible to prevent radio waves from the child device antenna 34 from being blocked by the protruding fastening parts. More specifically, it is possible to prevent screws inserted into the round holes 137B and 137D from becoming an obstacle to radio waves.

[0113] In the above embodiment, the child board 36 and the parent board 46 are connected to the bus bar 16 (power supply path) which connects the assembled battery 20 and an electrical load such as the motor 13. More specifically, the child board 36 is connected directly or indirectly to the bus bar 16 in order to connect to the battery cell 22 via the connector 31a. Moreover, the parent board 46 is connected directly or indirectly to the bus bar 16 in order to connect to the assembled battery 20 via the circular hole 47B.

[0114] 1, noise generated from a power conversion circuit using switching elements such as the PCU 12 and the relay switch 15 flows through the bus bar 16. Therefore, this noise may flow through the bus bar 16 to the front-end circuits 33, 43 of the child board 36 or the parent board 46, and may affect communication.

[0115] Therefore, the power converters such as the PCU 12 and the relay switch 15 are connected to a ground member in the power converter so that noise generated by on / off control of the switching elements of the power converter is released to the ground member (such as a chassis ground) so that the intensity of noise (magnitude of current or voltage) flowing from the bus bar 16 to the front-end circuits 33, 43 is equal to or less than the current value or voltage value of the current flowing through the front-end circuits 33, 43. This makes it possible to suppress the influence of noise and perform communication favorably. Also, the slave unit 32, the slave unit antenna 34, etc. can be arranged on the side where the connector 31a is arranged, that is, in the vicinity of the connector 31a.

[0116] In the above embodiment, the connection conductors are not limited to the inspection lands 38, 48, but may be pads.

[0117] In the above embodiment, high-frequency circuits such as the wireless ICs 32 and 42 and the front-end circuits 33 and 43 may be covered with a shielding can (metal shielding case), thereby suppressing the effects of noise.

[0118] In the above embodiment, the circuit boards 36, 46 are not limited to a rectangular shape and may be changed to any shape. They may also be polygonal or circular.

[0119] As another example of the above embodiment, the inspection by the inspection device 100 is performed on a representative circuit board 36, 46 (i.e., a prototype) before the mass production of the circuit boards 36, 46 (child device board 36 and parent device board 46, the same below). Then, when it is confirmed that the representative circuit board 36, 46 can secure the desired performance, these are mass-produced. Since the circuit boards 36, 46 for mass production have been confirmed to have the desired performance by the inspection before mass production, they are usually not inspected. Therefore, since the circuit boards 36, 46 for mass production are not inspected, the inspection lands 38 and the inspection terminals 38a are essentially unnecessary, but removing these may change the electrical characteristics from the representative circuit boards 36, 46 (prototypes) inspected before mass production. Therefore, in order to prevent the electrical characteristics from changing, at least the inspection lands 38 are also arranged on the circuit boards 36, 46 for mass production. In the above embodiment, inspection may be performed by the inspection device 100 at the mass production stage. In this case, inspection at the mass production stage may be performed on all the circuit boards 36, 46, or may be performed only on representative circuit boards 36, 46 by random inspection or the like. Note that as long as the inspection lands 38, 48 are provided on all the mass-produced circuit boards 36, 46, the inspection terminals 38a, 48a may or may not be present.

[0120] In the above embodiment, the shape, number and arrangement of the round holes 37A to 37D and 47A to 47D as fastening portions may be changed as desired.

[0121] In the above embodiment, the arrangement of the battery block 21, the battery monitoring device 30, and the battery control device 40 may be changed as desired. For example, as shown in FIG. 13(a), the battery monitoring device 30 may be arranged at the longitudinal end of each battery block 21, specifically, at both ends in the lateral direction (both ends in the left-right direction) of the housing 50 in FIG. 13(a). The battery control device 40 may be arranged on the side of the battery block 21 at one end in the longitudinal direction of the housing 50. In this case, as shown in FIG. 13(b), it may be arranged above the battery block 21 in the vertical direction. Wireless communication may be performed using the upper space of the housing 50 (space above the battery block 21). By arranging the battery monitoring device 30 and the battery control device 40 on the side of the battery block 21, it is possible to reduce the height compared to the case where they are arranged on the upper surface of the battery block 21.

[0122] In the above embodiment, it is preferable that the child device antenna 34 and the parent device antenna 44 are disposed closer to the battery monitoring device 30 or the battery control device 40 with which they communicate than the inspection lands 38, 48.

[0123] In the above embodiment, it is desirable that the child device antenna 34 and the parent device antenna 44 are disposed at a position higher (closer to the lid side of the housing 50) than the inspection lands 38, 48. This allows the child device antenna 34 and the parent device antenna 44 to perform wireless communication by suitably utilizing the upper space of the housing 50 without being affected by the inspection lands 38, 48 (or without affecting the inspection lands 38, 48).

[0124] In the above embodiment, when a directional antenna is used, it is preferable to adjust the directivity of the radio waves so as to utilize the upper space of the housing 50. In this case, it is preferable to arrange the directional antenna so that the direction of the directional antenna (directivity of the transmitted radio waves) faces the receiving side. In addition, it is preferable to arrange the test lands 38, 48 in the opposite direction to the direction of the directional antenna (directivity of the transmitted radio waves).

[0125] In the above embodiment, as shown in Fig. 14, the housing 150 may be made of resin, and the cover 152 of the housing 150 may be fixed by thermal caulking 151 without using metal parts such as bolts. By not using metal parts for the housing 150 in this way, diffuse reflection of radio waves can be prevented, and unnecessary deterioration of antenna characteristics can be prevented. Note that the round holes 237A, 237C (members to be connected to the ground member) serving as fastening parts for fixing the child device board 36 may be provided so as to protrude outside the housing 50.

[0126] In the above embodiment, as shown in FIG. 15, the housing 50 may be provided with a slit 55 for heat dissipation. The position of the slit 55 for heat dissipation is arbitrary. However, the slit 55 for heat dissipation is preferably provided at a position facing (or near) the components that require heat dissipation, such as the equalization circuit 35, the monitoring IC 31, and the battery control MCU 41. The slit 55 for heat dissipation is preferably provided to avoid a position facing (or near) a member that is easily affected by noise, such as the antennas 34 and 44 and the inspection lands 38 and 48. The slit 55 for heat dissipation is preferably provided at or on the lower part of the housing 50 in order to prevent foreign matter from entering the inside of the housing 50.

[0127] In the above embodiment, the master board 46 may be provided with a plurality of wireless devices (master side wireless IC 42, master side front-end circuit 43, master side wireless antenna 44). In this case, as shown in FIG. 16, two master side wireless ICs 42 may be provided near the center of the short side of the master board 46, and one of the two master side wireless antennas 44 may be arranged at one end side of the short side (upper side in the figure), and the other of the two master side wireless antennas 44 may be arranged at the other end side of the short side (lower side in the figure). In this way, the wireless devices can be arranged in a small space, improving area efficiency. In addition, the influence of wireless radio waves on each other can be suppressed.

[0128] 16, the battery control MCU 141, indicated by the dashed line, may be disposed on the surface (back side) opposite to the surface (front side) on which the wireless device is disposed. That is, the wireless device needs to be disposed in consideration of radio wave propagation, and there are restrictions on the position where it can be disposed on the circuit board. This may make it difficult to route the wiring between the master side wireless IC 42 and the battery control MCU 141. Therefore, by providing the battery control MCU 141 on the opposite back side and using the back side, which has fewer electronic components, as a wiring section, it is possible to make it easier to pass the wiring between the master side wireless IC 42 and the battery control MCU 141.

[0129] The control unit and the method described in the present disclosure may be realized by a special-purpose computer provided by configuring a processor and a memory programmed to execute one or more functions embodied in a computer program. Alternatively, the control unit and the method described in the present disclosure may be realized by a special-purpose computer provided by configuring a processor with one or more dedicated hardware logic circuits. Alternatively, the control unit and the method described in the present disclosure may be realized by one or more special-purpose computers configured by a combination of a processor and a memory programmed to execute one or more functions and a processor configured with one or more hardware logic circuits. In addition, the computer program may be stored in a computer-readable non-transitory tangible recording medium as instructions executed by a computer.

[0130] Characteristic configurations extracted from each of the above-described embodiments will be described below.

[0131] [Configuration 1] A circuit board (36, 46) for use in a battery monitoring system (2) for monitoring a battery state of a battery module (20, 21, 22), A radio antenna (34, 44); a wireless unit (32, 42) that transmits or receives the battery status by wireless communication via the wireless antenna; A circuit board of a battery monitoring system provided with a connection conductor (38, 48) configured to be connectable to an electrical path between the radio unit and the radio antenna and configured to be electrically connectable to an inspection terminal (38a, 48a).

[0132] [Configuration 2] A high voltage region (36a, 46a) and a low voltage region (36b, 46b) are provided, A circuit board of a battery monitoring system as described in configuration 1, in which, in the area in which the connection conductor is arranged, electronic components are arranged between the connection conductor and an area different from the area in which the connection conductor is arranged.

[0133] [Configuration 3] A high voltage region (36a, 46a) and a low voltage region (36b, 46b) are provided, a front end unit (33, 43) is disposed in an electrical path between the radio unit and the radio antenna; A circuit board of a battery monitoring system as described in configuration 1 or 2, in which, in the region in which the connection conductor is arranged, any one of the electronic components (61a to 61e) constituting the front end portion is arranged between the connection conductor and a region other than the region in which the connection conductor is arranged.

[0134] [Configuration 4] 4. The circuit board of the battery monitoring system according to configuration 3, wherein the front end portion is provided between the boundary (36c, 46c) between the high voltage area and the low voltage area and the connecting conductor.

[0135] [Configuration 5] the battery section is an assembled battery (20) formed by combining a plurality of unit batteries (22); The battery monitoring system includes a battery monitoring device (30) that monitors the unit battery (22) or a battery block (21) that combines some of the plurality of unit batteries and detects a battery state of the monitored object, and a battery control device (40) that manages the assembled battery based on the battery state detected by the battery monitoring device, The circuit board is used in the battery control device, A circuit board of a battery monitoring system described in any one of configurations 1 to 4, in which the connection conductor (48) is arranged in the low voltage area (46b), while a measurement unit (45) that measures the battery state of the assembled battery is provided in the high voltage area (46a).

[0136] [Configuration 6] the battery section is an assembled battery (20) formed by combining a plurality of unit batteries (22); The battery monitoring system includes a battery monitoring device (30) that monitors the unit battery (22) or a battery block (21) that combines some of the plurality of unit batteries and detects a battery state of the monitored object, and a battery control device (40) that manages the assembled battery based on the battery state detected by the battery monitoring device, The circuit board is used in the battery monitoring device, The high-voltage region (36a) has the connecting conductor (38) disposed therein, while the low-voltage region (36b) has fastening portions (37A-37D) for fixing the circuit board to a grounding member (50) and electrically connecting the grounding member to an electrical path in the low-voltage region; 5. The circuit board of the battery monitoring system according to any one of configurations 1 to 4, wherein the connection conductor is disposed farther from the fastening portion than the electronic component that is closest to the fastening portion.

[0137] [Configuration 7] An equalization circuit (35) is provided to equalize the voltages of the unit cells, 7. The circuit board of the battery monitoring system according to claim 6, wherein one of the radio antenna and the equalization circuit is arranged on an outer edge portion of the circuit board, and the other is arranged on a central portion of the circuit board.

[0138] [Configuration 8] a monitoring unit (31) for detecting a battery state to be monitored; 8. The circuit board of the battery monitoring system according to configuration 6 or 7, wherein the connecting conductor is disposed between the monitoring unit and a high-frequency circuit including the wireless unit and the wireless antenna.

[0139] [Configuration 9] a monitoring unit (31) for detecting a battery state to be monitored; 9. The circuit board of the battery monitoring system according to any one of configurations 6 to 8, wherein a slit (65) is provided between the monitoring unit and a high-frequency circuit including the wireless unit and the wireless antenna.

[0140] [Configuration 10] a monitoring unit (31) for detecting a battery state to be monitored; 10. The circuit board of the battery monitoring system according to any one of configurations 6 to 9, wherein a detection line (66) connected to the monitored object is soldered to the circuit board of the battery monitoring device.

[0141] [Configuration 11] One or more fastening portions (37A to 37D, 47A to 47D) for fixing the circuit board are provided on the outer edge portion of the circuit board, 11. The circuit board of the battery monitoring system according to any one of configurations 1 to 10, wherein the connection conductor is disposed on the inner side of the circuit board relative to the fastening portion.

[0142] [Configuration 12] The fastening portion is provided in plurality, A circuit board of a battery monitoring system according to configuration 11, wherein the connecting conductor or the wireless antenna is arranged to avoid the straight line connecting the fastening portions.

[0143] [Configuration 13] The circuit board is formed in a polygonal shape, A circuit board of a battery monitoring system as described in configuration 11 or 12, wherein, among the multiple fastening portions, the fastening portion closest to the wireless antenna is arranged on a side other than the side on which the wireless antenna is provided.

[0144] [Configuration 14] The circuit board is formed in a polygonal shape, Among the plurality of fastening portions, the fastening portion closest to the connection conductor is provided on an outer edge portion of any one of the sides of the circuit board, A circuit board of a battery monitoring system described in any one of configurations 11 to 13, wherein the connecting conductor is arranged on the side opposite to the side on which the fastening portion closest to the connecting conductor is provided, or on the central side of the circuit board compared to the fastening portion.

[0145] [Configuration 15] The circuit board is accommodated in a housing (50), an outer edge portion of the circuit board is disposed so as to face an inner wall of the housing; A circuit board of a battery monitoring system described in any one of configurations 1 to 14, wherein the connection conductor is positioned inside the circuit board relative to the radio antenna so that when the circuit board is accommodated in the housing, the connection conductor is farther from the inner wall of the housing than the radio antenna.

[0146] [Configuration 16] A circuit board of a battery monitoring system described in any one of configurations 1 to 15, wherein the connecting conductor is provided outside a predetermined range centered on a direction in which the radiation intensity of radio waves radiated from the wireless antenna is strongest.

[0147] [Configuration 17] the battery section is an assembled battery (20) formed by combining a plurality of unit batteries (22); An equalization circuit (30) is provided to equalize the voltages of the unit cells, 17. The circuit board of the battery monitoring system according to any one of configurations 1 to 16, wherein the equalization circuit is disposed closer to the connecting conductor than the wireless section.

[0148] [Configuration 18] the battery section is an assembled battery (20) formed by combining a plurality of unit batteries (22); An equalization circuit (35) is provided to equalize the voltages of the unit cells, 18. The circuit board of the battery monitoring system according to any one of configurations 1 to 17, wherein the equalization circuit is arranged on a surface opposite to a surface on which the wireless section and the connecting conductor are arranged.

[0149] [Configuration 19] 19. The circuit board of the battery monitoring system according to any one of configurations 1 to 18, wherein the connecting conductor is sealed with an insulating material (62).

[0150] [Configuration 20] A circuit board of a battery monitoring system described in any one of configurations 1 to 19, wherein the wireless antenna or the connection conductor is arranged to face a metal part of a housing that houses the circuit board or a case of the battery section.

[0151] [Configuration 21] the battery section is an assembled battery (20) formed by combining a plurality of unit batteries (22); An equalization circuit (35) is provided to equalize the voltages of the unit cells, A circuit board of a battery monitoring system described in any one of configurations 1 to 20, wherein the equalization circuit is arranged downwind of the radio antenna and the connecting conductor in the path of the airflow generated by a cooling blower (63) for the battery section.

[0152] [Configuration 22] A power supply system (11) including a battery monitoring device (30) for detecting a battery state of a battery unit (20, 21, 22), and a battery control device (40) for acquiring the battery state detected by the battery monitoring device through wireless communication with the battery monitoring device and managing the battery unit based on the battery state, The circuit board (46) of the battery control device and the circuit board (36) of the battery monitoring device are A radio antenna (32, 42); a wireless unit (31, 41) that transmits or receives the battery status by wireless communication via the wireless antenna; a connection conductor (38, 48) configured to be connectable to an electrical path between the radio unit and the radio antenna and configured to be electrically connectable to an inspection terminal (38a, 48a), A power supply system in which a connector (41a) for wired connection to an external device (14) is provided on one of both ends of the circuit board of the battery control device, and the wireless antenna is arranged on the other side.

[0153] [Configuration 23] 23. The power supply system according to claim 22, wherein the circuit board of the battery monitoring device is arranged on one of both ends of the circuit board of the battery control device on the side where the wireless antenna is provided.

[0154] [Configuration 24] The power supply system of configuration 22 or 23, wherein the wireless antenna is a directional antenna, the radio wave radiation intensity of which is high in a predetermined radiation direction, and the connector is arranged on the opposite side of the radiation direction with the wireless antenna as the center.

[0155] [Configuration 25] Each of the circuit boards is formed in a polygonal shape, A fastening portion (137B, 137D) for fixing the circuit board is provided so as to protrude from any side of the circuit board, 25. The power supply system according to any one of configurations 22 to 24, wherein the wireless antenna is provided on an outer edge portion of the circuit board, on a side on which the fastening portion is not provided.

[0156] [Configuration 26] A battery section (20, 21, 22), a power supply system (11) including a battery monitoring device (30) that detects a battery state of the battery unit, and a battery control device (40) that wirelessly communicates with the battery monitoring device to acquire the battery state detected by the battery monitoring device and manages the battery unit based on the battery state; A power conversion device (12, 15) connected to the power supply system and having a switching element for converting power from the power supply system or switching between energization and de-energization, The circuit board (46) of the battery control device and the circuit board (36) of the battery monitoring device are A radio antenna (32, 42); a wireless unit (31, 41) that transmits or receives the battery status by wireless communication via the wireless antenna; a connection conductor (38, 48) configured to be connectable to an electrical path between the radio unit and the radio antenna and configured to be electrically connectable to an inspection terminal (38a, 48a), a front end unit (33, 43) is disposed in an electrical path between the radio unit and the radio antenna; At least one of the circuit board of the battery control device and the circuit board of the battery monitoring device is connected to a bus bar (16) that connects the battery unit and an electrical load (13), In order to keep the intensity of noise flowing from the bus bar to the front end portion of the circuit board below the current value or voltage value of the current flowing through the front end portion, the power conversion device is connected to a ground member in the power conversion device so that noise generated by on / off control of the switching elements is released to the ground member. [Explanation of symbols]

[0157] 1...power supply control system, 2...battery monitoring system, 10...vehicle, 11...battery pack, 12...PCU, 13...motor, 14...vehicle ECU, 15...relay switch, 16...bus bar, 20...battery pack, 21...battery block, 22...battery cell, 30...battery monitoring device, 31...monitoring IC, 32...child unit, 33...child unit side front-end circuit, 34...child unit antenna, 35...equalization circuit, 36...child unit board, 38...inspection land for child unit board, 38a...inspection terminal for child unit board, 40...battery control device, 42...parent unit, 43...parent unit side front-end circuit, 44...parent unit antenna, 45...measurement circuit, 46...parent unit board, 48...inspection land for parent unit board, 48a...inspection terminal for parent unit board, 50...housing.

Claims

1. In a circuit board (36, 46) of a battery monitoring system (2) used in a battery monitoring system for monitoring the battery state of battery units (20, 21, 22), a wireless antenna (34, 44), a wireless section (32, 42) that performs wireless communication via the wireless antenna to transmit or receive the battery state, a connecting conductor (38, 48) configured to be connectable to an electrical path between the wireless section and the wireless antenna and having inspection terminals (38a, 48a) configured to be electrically connectable, a high voltage region (36a, 46a) and a low voltage region (36b, 46b) are provided, A circuit board of a battery monitoring system in which electronic components are arranged between the connecting conductor and a region different from the region where the connecting conductor is arranged in the region where the connecting conductor is arranged.

2. In a circuit board (36, 46) of a battery monitoring system (2) used in a battery monitoring system for monitoring the battery state of battery units (20, 21, 22), a wireless antenna (34, 44), a wireless section (32, 42) that performs wireless communication via the wireless antenna to transmit or receive the battery state, a connecting conductor (38, 48) configured to be connectable to an electrical path between the wireless section and the wireless antenna and having inspection terminals (38a, 48a) configured to be electrically connectable, a high voltage region (36a, 46a) and a low voltage region (36b, 46b) are provided, a front end section (33, 43) is arranged in the electrical path between the wireless section and the wireless antenna, A circuit board of a battery monitoring system in which any one of the electronic components (61a to 61e) constituting the front end section is arranged between the connecting conductor and a region different from the region where the connecting conductor is arranged in the region where the connecting conductor is arranged.

3. The circuit board of the battery monitoring system according to claim 2, wherein the front end section is provided between a boundary (36c, 46c) between the high voltage region and the low voltage region and the connecting conductor.

4. The battery unit is a battery pack (20) configured by combining a plurality of unit batteries (22), The battery monitoring system monitors a battery block (21) formed by combining the unit battery (22) or some of the plurality of unit batteries, and includes a battery monitoring device (30) that detects the battery state of the monitoring target, and a battery control device (40) that manages the assembled battery based on the battery state detected by the battery monitoring device. The circuit board is used for the battery control device. The circuit board of the battery monitoring system according to claim 1, wherein the connection conductor (48) is arranged in the low voltage region (46b), and a measurement unit (45) for measuring the battery state of the assembled battery is provided in the high voltage region (46a).

5. The battery unit is an assembled battery (20) formed by combining a plurality of unit batteries (22). The battery monitoring system monitors a battery block (21) formed by combining the unit battery (22) or some of the plurality of unit batteries, and includes a battery monitoring device (30) that detects the battery state of the monitoring target, and a battery control device (40) that manages the assembled battery based on the battery state detected by the battery monitoring device. The circuit board is used for the battery monitoring device. In the high voltage region (36a) thereof, the connection conductor (38) is arranged, while in the low voltage region (36b), fastening portions (37A to 37D) are provided for fixing the circuit board to the ground member (50) and electrically connecting the ground member and the electrical path of the low voltage region. The circuit board of the battery monitoring system according to claim 1, wherein the connection conductor is arranged farther from the fastening portion than the electronic component closest to the fastening portion.

6. An equalization circuit (35) for equalizing the voltages of each unit battery is provided. The circuit board of the battery monitoring system according to claim 5, wherein one of the wireless antenna and the equalization circuit is arranged on the outer edge portion side of the circuit board, and the other is arranged on the central portion side of the circuit board.

7. A monitoring unit (31) for detecting the battery state of the monitoring target is provided. The circuit board of the battery monitoring system according to claim 5, wherein the connection conductor is arranged between the high frequency circuit including the wireless unit and the wireless antenna and the monitoring unit.

8. A monitoring unit (31) for detecting the battery state of the monitoring target is provided. A slit (65) is provided between the high-frequency circuit including the wireless unit and the wireless antenna and the monitoring unit. The circuit board of the battery monitoring system according to claim 5.

9. A monitoring unit (31) for detecting the state of the battery to be monitored is provided. A detection line (66) connected to the object to be monitored is soldered to the circuit board of the battery monitoring device. The circuit board of the battery monitoring system according to claim 5.

10. One or more fastening portions (37A to 37D, 47A to 47D) for fixing the circuit board are provided at the outer edge portion of the circuit board. The conductive connection is disposed inside the circuit board relative to the fastening portion. The circuit board of the battery monitoring system according to claim 1.

11. A plurality of the fastening portions are provided. The conductive connection or the wireless antenna is disposed so as to avoid a straight line connecting the fastening portions. The circuit board of the battery monitoring system according to claim 10.

12. The circuit board is formed in a polygonal shape. Among the plurality of fastening portions, the fastening portion closest to the wireless antenna is disposed on a side different from the side where the wireless antenna is provided. The circuit board of the battery monitoring system according to claim 10.

13. The circuit board is formed in a polygonal shape. Among the plurality of fastening portions, the fastening portion closest to the conductive connection is provided at an outer edge portion of any side of the circuit board. The conductive connection is disposed on the side opposite to the side where the fastening portion closest to the conductive connection is provided, or on the central side of the circuit board compared to the fastening portion. The circuit board of the battery monitoring system according to claim 10.

14. The circuit board is housed in a housing (50). The outer edge portion of the circuit board is disposed so as to face the inner wall of the housing. When the circuit board is housed in the housing, the conductive connection is disposed inside the circuit board relative to the wireless antenna so as to be farther from the inner wall of the housing than the wireless antenna. The circuit board of the battery monitoring system according to any one of claims 1 to 13.

15. The conductive connection is provided outside a predetermined range centered on the direction in which the radiation intensity of the radio wave radiated from the wireless antenna is the strongest. The circuit board of the battery monitoring system according to any one of claims 1 to 13. In a circuit board (36, 46) of a battery monitoring system (2) used in a battery monitoring system for monitoring the battery state of a battery unit (20, 21, 22), a wireless antenna (34, 44); a wireless section (32, 42) that performs wireless communication via the wireless antenna to transmit or receive the battery state; a connecting conductor (38, 48) configured to be connectable to an electrical path between the wireless section and the wireless antenna and having inspection terminals (38a, 48a) configured to be electrically connectable; and the battery unit is a battery pack (20) formed by combining a plurality of unit batteries (22); an equalization circuit (30) for equalizing the voltages of the respective unit batteries is provided; the equalization circuit is arranged closer to the connecting conductor than the wireless section, on the circuit board of the battery monitoring system.

17. the battery unit is a battery pack (20) formed by combining a plurality of unit batteries (22); an equalization circuit (30) for equalizing the voltages of the respective unit batteries is provided; the equalization circuit is arranged closer to the connecting conductor than the wireless section, on the circuit board of the battery monitoring system according to any one of Claims 1 to 13.

18. In a circuit board (36, 46) of a battery monitoring system (2) used in a battery monitoring system for monitoring the battery state of a battery unit (20, 21, 22), a wireless antenna (34, 44); a wireless section (32, 42) that performs wireless communication via the wireless antenna to transmit or receive the battery state; a connecting conductor (38, 48) configured to be connectable to an electrical path between the wireless section and the wireless antenna and having inspection terminals (38a, 48a) configured to be electrically connectable; and the battery unit is a battery pack (20) formed by combining a plurality of unit batteries (22); an equalization circuit (35) for equalizing the voltages of the respective unit batteries is provided; the equalization circuit is arranged on a surface opposite to the surface on which the wireless section and the connecting conductor are arranged, on the circuit board of the battery monitoring system.

19. the battery unit is a battery pack (20) formed by combining a plurality of unit batteries (22); an equalization circuit (35) for equalizing the voltages of the respective unit batteries is provided; The equalization circuit is disposed on a surface opposite to the surface on which the wireless unit and the connection conductor are disposed, on a circuit board of the battery monitoring system according to any one of claims 1 to 13.

20. The connection conductor is sealed with an insulating material (62), on a circuit board of the battery monitoring system according to any one of claims 1 to 13.

21. The wireless antenna or the connection conductor is disposed so as to face a metal component of a housing that houses the circuit board or a case of the battery unit, on a circuit board of the battery monitoring system according to any one of claims 1 to 13.

22. In a circuit board (36, 46) of a battery monitoring system used in a battery monitoring system (2) that monitors the battery state of a battery unit (20, 21, 22), A wireless antenna (34, 44); A wireless unit (32, 42) that performs wireless communication via the wireless antenna and transmits or receives the battery state; A connection conductor (38, 48) configured to be connectable to an electrical path between the wireless unit and the wireless antenna, and having inspection terminals (38a, 48a) configured to be electrically connectable, is provided. The battery unit is a battery pack (20) configured by combining a plurality of unit batteries (22). An equalization circuit (35) for equalizing the voltages of the respective unit batteries is provided. In a passage of the wind generated by a cooling blower (63) of the battery unit, the equalization circuit is disposed downstream of the wireless antenna and the connection conductor, on a circuit board of the battery monitoring system.

23. The battery unit is a battery pack (20) configured by combining a plurality of unit batteries (22). An equalization circuit (35) for equalizing the voltages of the respective unit batteries is provided. In a passage of the wind generated by a cooling blower (63) of the battery unit, the equalization circuit is disposed downstream of the wireless antenna and the connection conductor, on a circuit board of the battery monitoring system according to any one of claims 1 to 13.

24. In a power supply system (11) having a battery monitoring device (30) that detects the battery state of a battery unit (20, 21, 22), and a battery control device (40) that wirelessly communicates with the battery monitoring device to acquire the battery state detected by the battery monitoring device and manages the battery unit based on the battery state, On the circuit board (46) of the battery control device and the circuit board (36) of the battery monitoring device, Wireless antennas (32, 42), a wireless section (31, 41) that performs wireless communication via the wireless antenna to transmit or receive the battery state, and connection conductors (38, 48) that are configured to be connectable to an electrical path between the wireless section and the wireless antenna and that are configured such that inspection terminals (38a, 48a) can be electrically connected, are respectively provided, a connector (41a) for wired connection to an external device (14) is provided on one side of both ends of the circuit board of the battery control device, and the wireless antenna is disposed on the other side, each of the circuit boards is formed in a polygonal shape, fastening portions (137B, 137D) for fixing the circuit board are provided so as to protrude from any side of the circuit board, the wireless antenna is provided on an outer edge portion of the circuit board on a side where the fastening portion is not provided in a power supply system.

25. The circuit board of the battery monitoring device is disposed on the side where the wireless antenna is provided among both ends of the circuit board of the battery control device, in the power supply system according to claim 24.

26. The wireless antenna is a directional antenna, and the radiation intensity of radio waves is high in a predetermined radiation direction. The connector is disposed on the side opposite to the radiation direction with the wireless antenna as the center, in the power supply system according to claim 24 or 25.

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