Battery monitoring system circuit board 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, and Power System Mu Regarding. [Background technology]

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

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-127318 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in such a battery monitoring system, it is necessary to check at a specific time, such as during prototyping or shipping, 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 view of the above circumstances, and its main object is to provide a circuit board for a battery monitoring system that can perform efficient testing, and Power System M The purpose is to provide. [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 carried out 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 send 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 carried out 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, the connector can be prevented from obstructing radio waves from the wireless antenna. [Brief explanation of the drawings]

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

[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 identical or corresponding parts in the drawings are designated by the same reference numerals, and their descriptions will not be repeated in principle. 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 that schematically illustrates the configuration of a vehicle 10. The vehicle 10 includes a battery pack 11 (referred to as "Battery" in FIG. 1), a power control unit (hereinafter referred to as "PCU (Power Control Unit)") 12 as a power conversion device, a motor 13 (referred to as "MG" in FIG. 1) as an electric load, and a vehicle ECU 14 (referred to 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 (referred to as "SMR" in FIG. 1) that switches between energizing and de-energizing the bus bar 16, and the power supply control system 1 may include the relay switch 15. The power conversion device may also 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 the engine compartment of the vehicle 10, but it may be installed in other locations such as the trunk, under the seats, or under the floor. The vehicle 10 is an electric vehicle or a hybrid vehicle that runs using the power stored in the battery pack 11.

[0018] The battery pack 11 includes an assembled battery 20 configured with a large number of battery cells 22 (unit batteries). The battery cells 22 are secondary batteries, such as 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 when the motor 13 generates power regeneratively, such as during vehicle braking. In this embodiment, the assembled battery 20 corresponds to the battery unit.

[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 that includes 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 a voltage equal to or higher than the output voltage of the battery pack 11.

[0021] The motor 13 is an AC rotating electric machine, such as 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 rotational driving force, which is transmitted to the drive wheels. Meanwhile, when braking the vehicle 10, 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 is configured to include a CPU, ROM, 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 schematically illustrating the configuration of the battery pack 11, and FIG. 5 is a cross-sectional view schematically illustrating 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 also be located outside the housing 50. Furthermore, the battery pack 20 and the battery monitoring system 2 may be directly attached to a vehicle body frame or the like, without including the housing 50. In other words, the vehicle body frame may replace the housing 50.

[0024] <Battery assembly configuration> The battery pack 20 has a plurality of battery blocks 21 (sometimes referred to as a battery stack or battery module). The battery pack 20 is configured by connecting these plurality of battery blocks 21 in series and / or parallel. Each battery block 21 has a plurality of battery cells 22. Each battery cell 22 is configured by a lithium-ion secondary battery, a nickel-metal hydride secondary battery, or the like. Note that a 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 battery block 21 is configured by connecting these plurality of battery cells 22 in series and / or parallel. Note that the provision of a battery block 21 is optional, and the battery pack 20 may be configured by connecting multiple battery cells 22 in series and / or parallel.

[0025] <Battery monitoring device> The battery monitoring device 30, also called a satellite battery module (SBM), is provided for each battery block 21, i.e., 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 unit, a handset-side wireless IC 32 as a wireless unit, a handset-side front-end circuit 33 as a front-end unit, a handset-side wireless antenna 34, an equalization circuit 35, and a handset-side circuit board 36. Hereinafter, the handset-side wireless IC 32 may be simply referred to as the handset 32, the handset-side wireless antenna 34 may be simply referred to as the handset antenna 34, and the handset-side circuit board 36 may be simply referred to as the handset board 36.

[0026] The monitoring IC 31, also called a cell monitoring circuit, acquires battery information for each battery cell 22 that constitutes the battery block 21. The battery information includes, for example, voltage information, temperature information, current information, etc. for each battery cell 22. 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 a wire. The slave device 32 is also connected by a wire to a slave device antenna 34 via a slave device-side front-end circuit 33 serving as a front-end unit. The slave device-side front-end circuit 33 performs demodulation processing to extract signals carried on radio waves received by the slave device antenna 34, and modulation processing to transmit signals on radio waves for external transmission from the slave device antenna 34. For example, as shown in FIG. 6, the slave device-side front-end circuit 33 is composed of multiple 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, and arrangement of the electronic components 61a to 61e may be changed as desired.

[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. The slave device 32 also 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 in accordance with an instruction from the monitoring IC 31 or the battery control device 40, and for equalizing the voltage of each battery cell 22.

[0030] These electronic components (monitoring IC 31, slave 32, slave side front-end circuit 33, slave antenna 34, equalization circuit 35, etc.) are mounted on the slave 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 communicate wirelessly 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 base unit-side wireless IC 42 as a wireless unit, a base unit-side front-end circuit 43 as a front-end unit, a base unit-side wireless antenna 44, a measurement circuit 45 as a measurement unit, and a base unit-side circuit board 46. Note that, hereinafter, the base unit-side wireless IC 42 may be simply referred to as the base unit 42, the base unit-side wireless antenna 44 may be referred to as the base unit antenna 44, and the base unit-side circuit board 46 may be referred to as the base unit board 46.

[0033] The battery control MCU 41 is composed of a microcontroller unit (microcontroller unit) including a CPU, ROM, RAM, 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 processes related to battery control.

[0034] As an example of a 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 blocks 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 energized and de-energized states of the assembled battery 20, the PCU 12, and the motor 13 based on the monitoring results. The battery control MCU 41 may also transmit an equalization signal to equalize the voltages of the battery cells 22. In this embodiment, the vehicle ECU 14 issues instructions to the PCU 12 to control the charging and discharging of the assembled battery 20. However, the battery control MCU 41 may also be configured to perform this function. As described above, the battery control MCU 41 manages the assembled battery 20, the battery blocks 21, and the battery cells 22.

[0035] The parent device 42 is connected by wire to the battery control MCU 41. The parent device 42 is also connected by wire to a parent device antenna 44 via a parent device side front end circuit 43 serving as a front end section. The parent device side front end circuit 43 performs demodulation processing, modulation processing, etc., 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 device 42 wirelessly transmits the data received from the battery control MCU 41 via the parent device side front-end circuit 43 and the parent device antenna 44. The parent device 42 also sends the data received via the parent device antenna 44 and the parent device 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 conductive material such as metal. The housing 50 is formed in the shape of a metal box, and is roughly rectangular parallelepiped. However, 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 test whether the battery control device 40 and the battery monitoring device 30 are operating normally. Furthermore, in wireless communication, tests that are not performed in wired communication, such as testing of antenna characteristics, are expected. Therefore, it is considered efficient to perform tests by dividing the components into several configurations. Therefore, in this embodiment, the following circuit configuration is used. This will be explained in detail.

[0041] Figure 3 is a plan view of the slave board 36, which schematically shows 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, which schematically shows 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 the slave board> As shown in Fig. 3, the slave device board 36 has a horizontally long rectangular shape, and circular holes 37A to 37D are provided near each corner as fastening portions for fixing the slave device 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 device board 36, electronic components such as the equalization circuit 35 are mounted on the left side of the slave device board 36, and electronic components such as the slave device 32, the slave device-side front-end circuit 33, and the slave device antenna 34 are mounted on the right side of the slave device board 36. Also, in Fig. 3, a connector 31a that connects to the battery cell 22 is attached to the left end of the slave device 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 slave 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-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 power supply 81 for the monitoring IC and the power supply 82 for the wireless IC are power conversion circuits as electronic components that convert power supplied from a battery (such as the battery pack 20 which is the main battery) and supply it to the monitoring IC 31 and the slave device 32.

[0044] 2, a slave-side front-end circuit 33 is disposed in the electrical path between the slave device 32 and the slave device antenna 34. An inspection land 38 is configured to be connectable to the electrical path from the slave-side front-end circuit 33 to the slave device antenna 34. The inspection land 38 is an annular copper foil portion (connection conductor) provided around a circular hole (through-hole) provided in the slave device board 36. As shown in FIG. 2, a pin-shaped inspection terminal 38a is inserted into the inspection land 38 to be electrically connected. Note that in this embodiment, the inspection terminal 38a is schematically 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 method may be changed as desired. For example, the inspection terminals 38a may be directly connected to the inspection lands 38, or may be fixed by soldering. Alternatively, a coaxial connector for connecting a coaxial cable may be used for connection.

[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 types of inspection information (data and signals) to and from the slave 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 slave device side front-end circuit 33 to the slave device antenna 34. By switching this path changeover switch 39, the inspection land 38 can be connected to the electrical path from the slave device side front-end circuit 33 to the slave device antenna 34.

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

[0048] Round holes 37A-37D provided near each corner of the slave board 36 are connected to the housing 50, which serves as a grounding member, thereby grounding the circuit. When grounding, it is desirable to ground the surface opposite to the surface on which the slave board antenna 34 and the test lands 38 are arranged. Thus, the slave board 36 is provided with a high-voltage region 36a that handles high voltages (e.g., several hundred volts) and a low-voltage region 36b that handles lower voltages (e.g., several tens of volts) than the high-voltage region 36a. The slave board 36 includes the slave unit 32, the slave-side front-end circuit 33, the slave board antenna 34, and the equalization circuit 35. Meanwhile, the low-voltage region 36b of the slave board 36 is provided around the round holes 37A-37D that are fixed to the housing 50. The low-voltage region 36b (the conductor pattern thereof) is grounded to the housing 50 via the round holes 37A-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, there is provided a boundary 36c that separates and insulates the low-voltage region 36b from the high-voltage region 36a. An electrical path L31 is provided at the boundary 36c to ground the electrical circuit provided in the high-voltage region 36a to the ground member (housing 50) via circular holes 37A-37D provided in the low-voltage region 36b. A common capacitor 36d and the like are 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 circular holes 37A-37D.

[0050] The high-voltage region 36a of the slave board 36 is defined by electronic components and electrical paths (conductor patterns) through which a high-voltage current flows, and at least the area around the electronic components and electrical paths through which a high-voltage current flows is the high-voltage region 36a. Similarly, the low-voltage region 36b of the slave 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 area around the electronic components and electrical paths through which a low-voltage current flows is the low-voltage region 36b.

[0051] Furthermore, the boundary 36c is an insulating region where no electrical paths are 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 have a certain width so that the high-voltage region 36a and the low-voltage region 36b are sufficiently separated from each other.

[0052] The test lands 38 are primarily used for testing during prototype development and are often not used during mass production (although they may be used in some cases). Therefore, in mass-produced products, the test terminals 38a are not attached, leaving the conductors (copper foil portions) exposed. In such cases, if the test lands 38 in the high-voltage region 36a of the slave board 36 are located near the low-voltage region 36b of the slave board 36 or near the inner wall of the housing 50, which is at the same potential as the low-voltage region 36b, the potential difference between the test lands 38 and the low-voltage region 36b increases the likelihood of dielectric breakdown between the test lands 38 and the low-voltage region 36b (or the housing 50). In other words, there is a risk that the electrical path in the high-voltage region 36a of the slave board 36 will short-circuit with the electrical path in the low-voltage region 36b (or the housing 50) via the test lands 38.

[0053] Therefore, the inspection land 38 in this embodiment is disposed farther from the low-voltage region 36b (or the housing 50) than the electronic component closest to the low-voltage region 36b. For example, the inspection land 38 is disposed farther from the upper right circular hole 37A than the child device front-end circuit 33 closest to the circular hole 37A. That is, in FIG. 3, any of the electronic components 61a to 61e constituting the child device front-end circuit 33 is disposed between the upper right circular hole 37A (and the low-voltage region 36b around it) and the inspection land 38. It can also be said that the child device front-end circuit 33 is disposed between the boundary 36c and the inspection land 38. Similarly, in FIG. 3, the child device 32 is disposed between the lower right circular hole 37B (and the low-voltage region 36b around it) and the inspection land 38. Similarly, the equalization circuit 35 and the like are disposed between the upper left or lower left circular holes 37C, 37D (and the low-voltage regions 36b around them) and the inspection land 38.

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

[0055] Furthermore, the slave board 36 is fixed to the housing 50 with screws or the like through the circular holes 37A to 37D. Therefore, stress is applied to the vicinity of the circular holes 37A to 37D by the screws or the like. The application of stress can distort the slave board 36, which in turn changes the impedance of the circuit and the wireless antenna, potentially affecting the frequency characteristics of radio waves and currents. Therefore, it is desirable that the slave antenna 34 and the inspection lands 38 be spaced a predetermined distance or more from the circular holes 37A to 37D. Therefore, the circular holes 37A to 37D are located near the corners of the slave board 36, and the slave antenna 34 and the inspection lands 38 are located inside the slave board 36.

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

[0057] 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. In other words, there is little space between the outer edge of the slave board 36 and the inner wall of the housing 50. For this reason, the test lands 38 are disposed further inside the slave board 36 than the slave antenna 34, so that they are farther from the inner wall of the housing 50 than the slave antenna 34. In other words, even when the battery monitoring device 30 is housed in the housing 50, the test terminals 38a can be easily inserted and removed from the test lands 38 without being obstructed by the inner wall of the housing 50.

[0058] The radiation pattern (pattern of the radiation intensity of the emitted radio waves) of the slave device antenna 34 is often not uniform in the circumferential direction. This is natural when a directional antenna is used as the slave device antenna 34, but even an omnidirectional antenna may have slight variations depending on the circuit layout, 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, as mentioned above, the test lands 38 are conductors and therefore may affect each other. For example, the test lands 38 may cause noise in radio waves (wireless communication). Furthermore, during testing, noise due to radio waves from the slave device antenna 34 may be generated in the circuit of the battery monitoring device 30 via the test lands 38.

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

[0060] Furthermore, the slave 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 battery pack 20. In other words, in a predetermined direction, the slave device antenna 34 and the inspection land 38 may be covered by 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.

[0061] <Master board shape and circuit layout> Next, the shape and circuit layout of the motherboard 46 will be described. As shown in Fig. 4, the motherboard 46 has a horizontally long rectangular shape, and round holes 47A to 47D are provided near each corner as fastening portions for fixing the motherboard 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 motherboard 46, the battery control MCU 41, the battery control MCU power supply 83, and the wireless IC power supply 84 are mounted near the center, and the motherboard 42, the motherboard-side front-end circuit 43, the motherboard 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 main board 46. The battery control MCU 41 is connected to the vehicle ECU 14 via the connector 41a and is configured to be able to transmit battery status (battery information) related to the battery cells 22. The battery control MCU 41 is also configured to be able to receive commands from the vehicle ECU 14.

[0063] The motherboard 46 is a printed circuit board, similar to the daughterboard 36, and the electronic components are connected to each other by conductor patterns. Although not shown, electronic components other than those mentioned above are also arranged on the motherboard 46. The electronic components include, for example, various electronic circuits and various circuit elements (capacitors, switching elements, resistors, etc.). In addition, the power supply 83 for the battery control MCU and the power supply 84 for the wireless IC are power conversion circuits 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 device side front-end circuit 43 is disposed in the electrical path between the parent device 42 and the parent device antenna 44. An inspection land 48 is configured to be connectable to the electrical path from the parent device side front-end circuit 43 to the parent device antenna 44. The inspection land 48 has the same configuration as the inspection land 38 of the child device 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 method may be changed as desired. For example, the inspection terminals 48a may be directly connected to the inspection lands 48, or may be fixed by soldering. Alternatively, a coaxial connector for connecting a coaxial cable may be used for connection.

[0066] The external inspection device 100 is configured to be able to transmit and receive various types of inspection information to and from the parent device 42 via the parent device-side front-end circuit 43 through the inspection terminals 48a and the inspection lands 48. As shown in Fig. 2, a path changeover switch 49 is provided between the inspection lands 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 lands 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 circular holes 47A-47D provided at each corner of the motherboard 46, a connector 45a to which the battery pack 20 is connected is disposed near the bottom right circular hole 47B. This connector 45a is connected to at least one of the positive and negative terminals of the battery pack 20 so as to acquire the highest and lowest potentials of the battery pack 20 (i.e., the inter-terminal voltage), or to acquire either one of them. That is, the connector 45a is a connector for acquiring a voltage used to detect dielectric breakdown (earth leakage). Accordingly, the motherboard 46 is provided with a high-voltage region 46a that handles high voltages (e.g., several hundred volts) and a low-voltage region 46b that handles low voltages (e.g., several tens of volts). More specifically, a measurement circuit 45 that is connected to the battery pack 20 via the connector 45a is disposed in the high-voltage region 46a of the motherboard 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, a boundary 46c is provided between the high-voltage area 46a and the low-voltage area 46b of the parent device board 46 to separate them.

[0068] The boundary 46c is provided with an electrical path L41 (shown 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 round 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 motherboard 46 is defined by electronic components and electrical paths (conductor patterns) through which a high-voltage current flows, and at least the area 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 motherboard 46 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 46a, and at least the area 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 motherboard 46 is an insulating region where no electrical paths are 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 have a certain width so that the high-voltage region 46a and the low-voltage region 46b are sufficiently separated from each other.

[0071] Incidentally, like the inspection lands 38, the inspection lands 48 are primarily used for testing at the prototype stage and are often not used (although they may be used) at the mass-production stage. For this reason, the inspection terminals 48a are not attached to mass-produced products, leaving the conductors (copper foil portions) exposed. This presents a similar problem to the inspection lands 38 of the daughter board 36. That is, there is a risk of short-circuiting between the high-voltage area 46a and the low-voltage area 46b of the daughter board 46 via the inspection lands 48 (or inspection terminals 48a, hereinafter the same).

[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, in FIG. 4, 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.

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

[0074] Furthermore, since the antenna 44 is fixed to the housing 50 with screws or the like through the circular holes 47A to 47D, stress is also likely to be applied to the straight line connecting the circular holes 47A to 47D, which can easily cause distortion. For this reason, it is desirable to arrange the base unit antenna 44 and the inspection lands 48 so as to avoid the straight line connecting the circular holes 47A to 47D. In this embodiment, the inspection lands 48 are arranged so as to avoid the straight line connecting the circular holes 47A to 47D.

[0075] 5, the outer edge of the mother board 46 faces the inner wall of the housing 50 and is disposed close to the inner wall. In other words, there is little space between the outer edge of the mother board 46 and the inner wall of the housing 50. For this reason, the test lands 48 are disposed further inside the mother board 46 than the mother antenna 44 so as to be farther from the inner wall of the housing 50 than the mother antenna 44. In other words, even when the battery control device 40 is housed in the housing 50, the test terminals 48a can be easily inserted into and removed from the test lands 48 without being obstructed by the inner wall of the housing 50.

[0076] As with the slave board 36, the test lands 48 of the master board 46 are provided outside a predetermined range centered on the direction of radiation in which the radio waves emitted from the master antenna 44 have the strongest radiation intensity. In FIG. 4, the direction of radiation in which the radio waves emitted from the master antenna 44 have the strongest radiation intensity is indicated by arrow Y2, and the predetermined range is indicated by a dashed line. The predetermined range may be set within a range of 0 to 180 degrees, and preferably outside a range of 30 to 90 degrees. In this embodiment, the predetermined range is set to a 90-degree range centered on the direction in which the radio waves emitted from the master antenna 44 have the strongest radiation intensity.

[0077] As with the slave board 36, the master antenna 44 and the inspection lands 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 slave board 36 is provided with test lands 38 to which test terminals 38a are connected. An external test device 100 is configured to transmit and receive various test information to and from the slave board 32 via the test terminals 38a and the test lands 38. This makes it possible to input and output various signals from the middle of the electrical path via the test lands 38. This allows the test objects to be separated. For example, it is possible to test only the antenna characteristics. This allows for efficient testing. Note that the master board 46 is also provided with test lands 48, and the same effects as those of the slave board 36 can be obtained.

[0080] The inspection lands 38, 48 are arranged farther from an area different from the area in which they are arranged than the electronic component closest to that area. That is, in the area in which the inspection lands 38, 48 are arranged, electronic components are arranged between the inspection lands 38, 48 and the area different from the area 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, one of the electronic components 61a-61e that constitute the child device 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 that is grounded to the housing 50 than the electronic components 61a-61e that are closest to the circular hole 37A. In the low-voltage region 46b where the inspection land 48 is arranged, the electronic components 61a-61e that constitute the parent device front-end circuit 43 are arranged between the inspection land 48 and the high-voltage region 46a. This makes it possible to prevent 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 lands 38 and the equalization circuit 35 is disposed on the outer edge of the slave board 36, and the other is disposed on the center side. Similarly, one of the slave antenna 34 and the equalization circuit 35 is disposed on the outer edge of the slave board 36, and the other is disposed on the center side. In this embodiment, the inspection lands 38 and the slave antenna 34 are disposed on the outer edge side, and the equalization circuit 35 is disposed on the center side. This reduces the effect of heat generated by the equalization circuit 35 on the slave antenna 34, and prevents communication problems caused by heat.

[0083] An inspection land 38 is disposed between the monitor IC 31 and a high-frequency circuit consisting of the slave device 32, slave device-side front-end circuit 33, and slave device 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 and adversely affecting 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] Circular holes 37A-37D, 47A-47D for fixing to the housing 50 are provided on the outer edge of the daughter board 36 or the mother board 46, and the test lands 38, 48 are arranged further inward of the circular holes 37A-37D, 47A-47D on the daughter board 36 or the mother board 46. This allows the test lands 38, 48 to be suitably spaced apart from the circular holes 37A-37D, 47A-47D. Therefore, when the daughter board 36 or the mother board 46 is fixed with screws or the like, the influence of strain caused by stress near the circular holes 37A-37D, 47A-47D on the test lands 38, 48 can be prevented. This prevents changes in impedance and enables accurate testing.

[0085] Furthermore, the inspection lands 38, 48 and the wireless antennas 34, 44 are arranged to avoid the lines connecting the circular holes 37A to 37D and 47A to 47D. This prevents the effects of strain caused by stress on the inspection lands 38, 48 and the wireless antennas 34, 44 on the lines connecting the circular holes 37A to 37D and 47A to 47D. This prevents changes in impedance, enabling accurate inspection. Furthermore, the effects on the wireless antennas 34, 44 can be reduced.

[0086] 5, the outer edge of the slave board 36 is disposed facing the inner wall of the housing 50. Therefore, the test lands 38 are disposed further inside the slave board 36 than 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 test terminals 38a into and from the test lands 38 without being obstructed by the inner wall of the housing 50.

[0087] Similarly, the outer edge of the motherboard 46 faces the inner wall of the housing 50. Therefore, the test lands 48 are arranged further inside the motherboard 46 than the motherboard antenna 44 so as to be farther from the inner wall of the housing 50 than the motherboard antenna 44. This makes it easier to insert and remove the test terminals 48a into and from the test 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 test 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. Furthermore, 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 handset antenna 34. This allows heat generated by the equalization circuit 35 to be dissipated via the inspection lands 38, thereby preventing the heat from being transmitted to the handset antenna 34. This prevents problems with wireless communication by the handset antenna 34 caused by the influence of heat.

[0091] The wireless antennas 34, 44 and the inspection lands 38, 48 may be arranged to face metal parts provided on the housing 50 or the case of the battery pack 20. When arranged 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 handset antenna 34 is arranged on a side different from the side on which handset antenna 34 is provided. That is, handset antenna 34 is arranged on the long side of handset board 36, and round hole 37A closest to handset antenna 34 is provided on the short side of handset board 36. This makes it possible to prevent distortion occurring near round hole 37A from affecting handset 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 prevents radio waves from the parent antenna 44 from interfering with and being blocked by the connector 41a. In other words, the connector 41a can be prevented from interfering with wireless communication.

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

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

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

[0097] In the above embodiment, the test lands 38 are arranged closer to the center of the slave board 36 than the round holes 37A to 37D closest to the test lands 38. However, the test lands 38 may be arranged on the side opposite to the side on which the round holes 37A to 37D closest to the test lands 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 slave board 36, the test lands 38 may be arranged on the left side. This prevents distortions occurring near the round holes 37C and 37D from affecting the test lands 38.

[0098] Similarly, the inspection land 48 may be arranged on the side opposite to the side on which the round hole 47D closest to the inspection land 48 is provided. For example, if the round 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 slave device antenna 34, that is, closer to the inspection land 38, but it may also be arranged closer to the slave device antenna 34.

[0100] In the above embodiment, the slave board 36 may be configured so that elements and circuits can be arranged on both the front and back surfaces. In this case, as shown in FIG. 8 , the equalization circuit 35 may be arranged on a different surface than the inspection lands 38. The equalization circuit 35 may also be arranged on a different surface than the slave unit 32. Similarly, the equalization circuit 35 may also be arranged on a different surface than the slave unit antenna 34. This prevents heat generated by the equalization circuit 35 from being transmitted to the slave unit 32 or the inspection lands 38 during testing. This allows for accurate testing. In addition, in this configuration, it is desirable to connect a ground member (such as the housing 50) to the side opposite the side on which the slave unit antenna 34 and the inspection lands 38 are arranged. This prevents noise from being transmitted from the ground member to the slave unit antenna 34 or the inspection lands 38.

[0101] Similarly, the power supply 81 for the monitoring IC, which can 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, and 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 wireless IC power supplies 82, 84 be arranged a predetermined distance away 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 wireless IC power supplies 82, 84.

[0103] In the above embodiment, after the test, the test 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 test lands 38, 48.

[0104] In the above embodiment, the inspection land 38 may be arranged 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 slave device antenna 34, but the connection configuration may be changed as desired. For example, a short-circuit element may be used to connect the electrical path connected to the inspection land 38 and the electrical path connected to the slave device antenna 34. Alternatively, both the electrical path connected to the inspection land 38 and the electrical path connected to the slave device antenna 34 may be connected to the electrical path to which the slave device 32 is connected, and an electronic component (such as a bandpass filter) arranged in at least one of the electrical path connected to the inspection land 38 and the electrical path connected to the slave device antenna 34 may be used to select whether or not to transmit a signal to the slave 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 base unit antenna 44 may also be changed arbitrarily.

[0107] The battery pack 11 of the above embodiment may be provided with a cooling blower 63 that generates air to cool the battery assembly 20. In this case, as shown in Fig. 10, the equalization circuit 35 is arranged downwind of the slave device antenna 34 and the inspection lands 38 in the path of the airflow generated by the cooling blower 63 (the arrows in the figure indicate the direction and path of the airflow). In other words, the slave device antenna 34 and the inspection lands 38 are arranged upwind, and the equalization circuit 35 is arranged downwind. This prevents heat from being transmitted to the slave device antenna 34 and the inspection lands 38 via the airflow, even if the equalization circuit 35 generates heat.

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

[0109] 9, a slit 65 (groove) may be formed between the high-frequency circuit, which includes the slave device 32, slave device antenna 34, and slave device-side front-end circuit 33, and the monitoring IC 31 and equalization circuit 35. This makes it possible to prevent the influence of high-frequency noise generated from the high-frequency circuit from reaching 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, which can suppress interference with radio waves transmitted and received from the slave antenna 34.

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

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

[0113] In the above embodiment, the slave board 36 and the master board 46 are connected to the bus bar 16 (power supply path) that connects the assembled battery 20 and electrical loads such as the motor 13. More specifically, the slave board 36 is connected directly or indirectly to the bus bar 16 to connect to the battery cell 22 via the connector 31a. Furthermore, the master board 46 is connected directly or indirectly to the bus bar 16 to connect to the assembled battery 20 via the circular hole 47B.

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

[0115] Therefore, power conversion devices such as PCU 12 and relay switch 15 are connected to a ground member in the power conversion device so that noise generated by on / off control of switching elements of the power conversion device is diverted to the ground member (such as a chassis ground) so that the intensity of noise (magnitude of current or voltage) flowing from bus bar 16 to front-end circuits 33, 43 is equal to or less than the current or voltage value of the current flowing through the front-end circuits 33, 43. This suppresses the influence of noise, enabling favorable communication. Furthermore, handset 32, handset antenna 34, etc. can be arranged on the side where connector 31a is arranged, i.e., near 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-described 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 shield can (metal shield case), thereby suppressing the influence of noise.

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

[0119] As another example of the above embodiment, testing using the testing device 100 is performed on representative circuit boards 36, 46 (i.e., prototypes) before mass-production of circuit boards 36, 46 (child device boards 36 and mother device boards 46; the same applies hereinafter). Then, if it is confirmed that the representative circuit boards 36, 46 can ensure the desired performance, these circuit boards are mass-produced. Since the desired performance has been confirmed through testing before mass production, mass-production circuit boards 36, 46 are not typically tested. Therefore, since mass-production circuit boards 36, 46 are not tested, the test lands 38 and test terminals 38a are essentially unnecessary. However, removing these lands and terminals could result in changes in electrical characteristics compared to the representative circuit boards 36, 46 (prototypes) tested before mass production. Therefore, to prevent changes in electrical characteristics, at least the test lands 38 are provided on the mass-production circuit boards 36, 46. In the above embodiment, inspection may be performed using the inspection device 100 during mass production. In this case, inspection during mass production may be performed on all circuit boards 36, 46, or may be performed on only representative circuit boards 36, 46 by sampling inspection or the like. Note that as long as inspection lands 38, 48 are provided on all 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 blocks 21, the battery monitoring devices 30, and the battery control device 40 may be changed as desired. For example, as shown in FIG. 13(a), the battery monitoring devices 30 may be arranged at the longitudinal ends of each battery block 21, specifically, at both ends of the lateral direction (both left and right ends) 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 longitudinal end of the housing 50. In this case, as shown in FIG. 13(b), the battery control device 40 may be arranged above the battery block 21 in the vertical direction. Wireless communication may be performed using the space above the housing 50 (the space above the battery block 21). Furthermore, by arranging the battery monitoring devices 30 and the battery control device 40 on the side of the battery block 21, a lower height can be achieved compared to when they are arranged on the top surface of the battery block 21.

[0122] In the above embodiment, it is desirable that the slave device antenna 34 and the master 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 handset antenna 34 and the base unit antenna 44 are disposed in a position higher (closer to the lid of the housing 50) than the inspection lands 38, 48. This allows the handset antenna 34 and the base unit antenna 44 to perform wireless communication by optimally utilizing the space above 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 desirable to adjust the directionality of the radio waves so as to utilize the space above the housing 50. In this case, it is desirable to arrange the directional antenna so that its direction (directivity of the transmitted radio waves) points toward the receiving side. In addition, it is desirable 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 and 237C (members for connecting to the ground member) serving as fastening parts for fixing the slave board 36 may be provided so as to protrude outside the housing 50.

[0126] In the above embodiment, as shown in FIG. 15 , heat dissipation slits 55 may be provided in the housing 50. The heat dissipation slits 55 may be provided at any position. However, it is desirable that the heat dissipation slits 55 be provided in a position facing (or near) components that require heat dissipation, such as the equalization circuit 35, the monitoring IC 31, and the battery control MCU 41. It is also desirable that the heat dissipation slits 55 be provided in a position that avoids facing (or near) components that are susceptible to noise, such as the antennas 34 and 44 and the inspection lands 38 and 48. It is also desirable that the heat dissipation slits 55 be provided in the lower portion or on the lower side of the housing 50 to prevent foreign matter from entering the housing 50.

[0127] In the above embodiment, the base unit board 46 may be provided with multiple wireless devices (base unit side wireless IC 42, base unit side front-end circuit 43, and base unit side wireless antenna 44). In this case, as shown in FIG. 16 , two base unit side wireless ICs 42 may be provided near the center of the base unit board 46 in the short-side direction, and one of the two base unit side wireless antennas 44 may be disposed at one end of the short-side direction (upper side in the figure), and the other of the two base unit side wireless antennas 44 may be disposed at the other end of the short-side direction (lower side in the figure). In this way, the wireless devices can be disposed in a small space, improving area efficiency. Furthermore, it is possible to suppress the influence of wireless radio waves on each other.

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

[0129] The controller and methods described herein may be implemented by a special-purpose computer configured with a processor and memory programmed to perform one or more functions embodied in a computer program. Alternatively, the controller and methods described herein may be implemented by a special-purpose computer configured with a processor configured with one or more dedicated hardware logic circuits. Alternatively, the controller and methods described herein may be implemented by one or more special-purpose computers configured with a processor and memory programmed to perform one or more functions in combination with a processor configured with one or more hardware logic circuits. Furthermore, the computer program may be stored as instructions executed by a computer on a computer-readable non-transitory storage medium.

[0130] The following describes characteristic configurations extracted from the above-described embodiments.

[0131] [Configuration 1] A circuit board (36, 46) for a battery monitoring system (2) for monitoring the battery state of a battery unit (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 for a battery monitoring system, the circuit board being provided with a connecting 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), A circuit board of a battery monitoring system as described in configuration 1, in which, in the area where the connecting conductor is arranged, electronic components are arranged between the connecting conductor and an area different from the area where the connecting conductor is arranged.

[0133] [Configuration 3] a high voltage region (36a, 46a) and a low voltage region (36b, 46b), 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 described in configuration 1 or 2, in which, in the region where the connecting conductor is arranged, any of the electronic components (61a to 61e) constituting the front end portion is arranged between the connecting conductor and a region different from the region where the connecting 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 a battery pack (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 according to any one of configurations 1 to 4, in which the connecting conductor (48) is arranged in the low voltage area (46b), while a measuring unit (45) for measuring the battery state of the battery pack is provided in the high voltage area (46a).

[0136] [Configuration 6] the battery section is a battery pack (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) is provided with the connecting conductor (38), while the low-voltage region (36b) is provided with fastening portions (37A-37D) that fix the circuit board to a grounding member (50) and electrically connect 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 connecting 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) for equalizing the voltages of the unit cells; The circuit board of the battery monitoring system described in configuration 6, wherein one of the radio 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.

[0138] [Configuration 8] a monitoring unit (31) for detecting the state of the battery 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 the state of the battery 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 the state of the battery 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 connecting conductor is arranged on the inner side of the circuit board relative to the fastening portion.

[0142] [Configuration 12] The fastening portion is provided in plurality, 12. The circuit board of the battery monitoring system according to claim 11, wherein the connecting conductor or the wireless antenna is arranged so as to avoid being on 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 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 different from 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 connecting conductor is provided on an outer edge portion of any one side 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 relative to the fastening portion.

[0145] [Configuration 15] The circuit board is housed 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 connecting conductor is positioned more inward of the circuit board than the wireless antenna so that when the circuit board is housed in the housing, the connecting conductor is farther from the inner wall of the housing than the wireless 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 the direction in which the radiation intensity of the radio waves emitted from the wireless antenna is strongest.

[0147] [Configuration 17] the battery section is a battery pack (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 radio section.

[0148] [Configuration 18] the battery section is a battery pack (20) formed by combining a plurality of unit batteries (22), an equalization circuit (35) for equalizing 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 the surface opposite to the surface on which the radio 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 connecting 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 a battery pack (20) formed by combining a plurality of unit batteries (22), an equalization circuit (35) for equalizing 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 wireless antenna and the connecting conductor in the path of the wind generated by the cooling blower (63) for the battery section.

[0152] [Configuration 22] A power supply system (11) including a battery monitoring device (30) that detects battery states of battery units (20, 21, 22), and a battery control device (40) that wirelessly communicates with the battery monitoring device to acquire the battery states detected by the battery monitoring device and manages the battery units based on the battery states, The circuit board (46) of the battery control device and the circuit board (36) of the battery monitoring device are provided with: a radio antenna (32, 42); a wireless unit (31, 41) that transmits or receives the battery status by wireless communication via the wireless antenna; connecting conductors (38, 48) configured to be connectable to an electrical path between the radio section and the radio antenna and configured to be electrically connectable to inspection terminals (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 located on the other end.

[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 the two 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, and the radio wave radiation intensity is high in a predetermined radiation direction, and the connector is arranged on the opposite side of the radiation direction from the wireless antenna.

[0155] [Configuration 25] 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, 25. The power supply system according to any one of configurations 22 to 24, wherein the wireless antenna is provided on an outer edge of the circuit board, on a side where 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 communicates wirelessly 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 for 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 provided with: a radio antenna (32, 42); a wireless unit (31, 41) that transmits or receives the battery status by wireless communication via the wireless antenna; connecting conductors (38, 48) configured to be connectable to an electrical path between the radio section and the radio antenna and configured to be electrically connectable to inspection terminals (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 make the intensity of noise flowing from the bus bar to the front end portion of the circuit board equal to or less than 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 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 front-end circuit, 34...child unit antenna, 35...equalization circuit, 36...child unit board, 38...inspection land on child unit board, 38a...inspection terminal on child unit board, 40...battery control device, 42...parent unit, 43...parent unit front-end circuit, 44...parent unit antenna, 45...measuring circuit, 46...parent unit board, 48...inspection land on parent unit board, 48a...inspection terminal on parent unit board, 50...casing

Claims

1. A circuit board (36, 46) for a battery monitoring system (2) that monitors the battery state of a battery unit (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 connecting 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 high voltage region (36a, 46a) and a low voltage region (36b, 46b) are provided; A circuit board of a battery monitoring system in which, in the area where the connecting conductor is arranged, electronic components are arranged between the connecting conductor and an area different from the area where the connecting conductor is arranged.

2. A circuit board (36, 46) for a battery monitoring system (2) that monitors the battery state of a battery unit (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 connecting 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 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 in which, in the region where the connecting conductor is arranged, one of the electronic components (61a to 61e) constituting the front end portion is arranged between the connecting conductor and a region different from the region where the connecting conductor is arranged.

3. 3. The circuit board of the battery monitoring system according to claim 2, 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.

4. The battery section is a battery pack (20) configured 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 the 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, 2. The circuit board of a battery monitoring system as described in claim 1, wherein the connecting conductors (48) are arranged in the low voltage area (46b), while a measuring unit (45) for measuring the battery state of the battery pack is provided in the high voltage area (46a).

5. The battery section is a battery pack (20) configured 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 the 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; The circuit board of the battery monitoring system according to claim 1 , wherein the connecting conductor is disposed farther from the fastening portion than the electronic component closest to the fastening portion.

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

7. a monitoring unit (31) for detecting the battery state of the monitoring target; 6. The circuit board of the battery monitoring system according to claim 5, wherein the connecting conductor is disposed between the monitoring unit and a high-frequency circuit including the radio unit and the radio antenna.

8. a monitoring unit (31) for detecting the battery state of the monitoring target; 6. The circuit board of the battery monitoring system according to claim 5, wherein a slit (65) is provided between the monitoring unit and a high-frequency circuit including the radio unit and the radio antenna.

9. a monitoring unit (31) for detecting the battery state of the monitoring target; 6. The circuit board of the battery monitoring system according to claim 5, wherein a detection line (66) connected to the monitored object is soldered to the circuit board of the battery monitoring device.

10. 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, The circuit board of the battery monitoring system according to claim 1 , wherein the connecting conductor is disposed inside the fastening portion of the circuit board.

11. The fastening portion is provided in plurality, The circuit board of the battery monitoring system according to claim 10 , wherein the connecting conductor or the wireless antenna is arranged so as to avoid a line connecting the fastening portions.

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

13. The circuit board is formed in a polygonal shape, Among the plurality of fastening portions, the fastening portion closest to the connecting conductor is provided on an outer edge portion of any one side of the circuit board, The circuit board of the battery monitoring system described in claim 10, 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 closer to the center of the circuit board than the fastening portion.

14. The circuit board is housed 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 claims 1 to 13, wherein the connecting conductor is positioned inside the circuit board relative to the wireless antenna so that when the circuit board is housed in the housing, the connecting conductor is farther from the inner wall of the housing than the wireless antenna.

15. A circuit board of a battery monitoring system described in any one of claims 1 to 13, wherein the connecting conductor is arranged outside a predetermined range centered on the direction in which the radiation intensity of the radio waves emitted from the wireless antenna is strongest.

16. 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 radio antenna (34, 44); a wireless unit (32, 42) that transmits or receives the battery status by wireless communication via the wireless antenna; a connecting 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 (38 a, 48 a), The battery section is a battery pack (20) configured by combining a plurality of unit batteries (22), An equalization circuit (30) is provided to equalize the voltages of the unit cells, A circuit board for a battery monitoring system, wherein the equalization circuit is disposed closer to the connecting conductor than the radio section.

17. The battery section is a battery pack (20) configured by combining a plurality of unit batteries (22), An equalization circuit (30) is provided to equalize the voltages of the unit cells, 14. The circuit board of the battery monitoring system according to claim 1, wherein the equalization circuit is disposed closer to the connecting conductor than the radio section.

18. 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 radio antenna (34, 44); a wireless unit (32, 42) that transmits or receives the battery status by wireless communication via the wireless antenna; a connecting 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 (38 a, 48 a), The battery section is a battery pack (20) configured by combining a plurality of unit batteries (22), an equalization circuit (35) for equalizing the voltage of each unit battery is provided; The equalization circuit is disposed on a surface of the circuit board opposite to a surface on which the radio section and the connecting conductor are disposed.

19. The battery section is a battery pack (20) configured by combining a plurality of unit batteries (22), an equalization circuit (35) for equalizing the voltage of each unit battery is provided; The circuit board of the battery monitoring system according to any one of claims 1 to 13, wherein the equalization circuit is arranged on a surface opposite to the surface on which the radio section and the connecting conductor are arranged.

20. The circuit board of a battery monitoring system according to any one of claims 1 to 13, wherein the connecting conductors are encapsulated with an insulating material (62).

21. A circuit board of a battery monitoring system described in any one of claims 1 to 13, wherein the wireless antenna or the connecting conductor is arranged to face a metal part of a housing that houses the circuit board or a case of the battery section.

22. 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 radio antenna (34, 44); a wireless unit (32, 42) that transmits or receives the battery status by wireless communication via the wireless antenna; a connecting 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 (38 a, 48 a), The battery section is a battery pack (20) configured by combining a plurality of unit batteries (22), an equalization circuit (35) for equalizing the voltage of each unit battery is provided; A circuit board for a battery monitoring system, wherein the equalization circuit is arranged downwind of the wireless antenna and the connecting conductor in the path of the wind generated by the cooling blower (63) for the battery section.

23. The battery section is a battery pack (20) configured by combining a plurality of unit batteries (22), an equalization circuit (35) for equalizing the voltage of each unit battery is provided; A circuit board of a battery monitoring system described in any one of claims 1 to 13, wherein the equalization circuit is positioned downwind of the radio antenna and the connecting conductor in the path of the wind generated by the cooling blower (63) for the battery section.

24. 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, The circuit board (46) of the battery control device and the circuit board (36) of the battery monitoring device are provided with: a radio antenna (32, 42); a wireless unit (31, 41) that transmits or receives the battery status by wireless communication via the wireless antenna; and connecting conductors (38, 48) configured to be connectable to an electrical path between the radio section and the radio antenna and configured to be electrically connectable to inspection terminals (38 a, 48 a), a connector (41 a) 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 disposed on the other end; 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, A power supply system in which the wireless antenna is provided on an outer edge portion of the circuit board, on a side where the fastening portion is not provided.

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

26. 26. The power supply system of claim 24 or 25, wherein the wireless antenna is a directional antenna, the radiation intensity of radio waves being higher in a predetermined radiation direction, and the connector is positioned on the opposite side of the radiation direction from the wireless antenna.

Images