JP2019126227A - Battery monitoring system - Google Patents

Abstract

To provide a battery monitoring system capable of monitoring the battery of vehicle properly.SOLUTION: A RFID circuit 11 has an RFID antenna 11a capable of transmitting signals. A sensor part 12 is connected with the RFID circuit 11 and the battery pack 100 of a vehicle, and outputs the state of the battery pack 100 to the RFID circuit 11. A sensor unit 10 transmits a detection signal containing the state of the battery pack 100 from the RFID antenna 11a. A battery monitoring controller 21 is connected with a reader antenna 22, and monitors the state of the battery pack 100 on the basis of the detection signal transmitted from the sensor unit 10. A battery monitoring device 20 has a TEM line 23 connecting the reader antenna 22 and the battery monitoring controller 21 communicably, and extending until a position where the reader antenna 22 faces the RFID antenna 11a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a battery monitoring system.

  Conventionally, as a battery monitoring system, for example, Patent Document 1 discloses a battery system that transmits the state of a battery pack including a plurality of battery cells mounted on a vehicle such as a hybrid vehicle or an electric vehicle by wireless communication. . The battery system detects a state of each battery cell, and a cell controller that wirelessly transmits the state of each battery cell, and a charging state of each battery cell based on the state of each battery cell wirelessly transmitted from the cell controller. And a battery controller that monitors the

JP, 2014-197345, A

  By the way, in the battery system described in Patent Document 1 described above, for example, radio waves of wireless communication may affect other devices in the vehicle and other vehicles as noise, and there is room for further improvement in this respect. .

  Then, this invention is made in view of the above, Comprising: It aims at providing the battery monitoring system which can monitor the battery of a vehicle appropriately.

  In order to solve the problems described above and achieve the object, a battery monitoring system according to the present invention includes a proximity wireless communication unit having a first antenna capable of transmitting a signal, and the proximity wireless communication unit and a battery of a vehicle. A detection device configured to include a sensor unit connected to output the state of the battery to the close proximity wireless communication unit, and transmitting a detection signal including the state of the battery from the first antenna; and capable of receiving the detection signal A battery monitoring device configured to include a second antenna and a battery monitoring unit that monitors the state of the battery based on the detection signal that is connected to the second antenna and transmitted from the detection device; The monitoring device includes a communication line communicably connecting the second antenna and the battery monitoring unit and extending to a position where the second antenna faces the first antenna. .

  In the battery monitoring system, preferably, at least one of the second antennas is disposed to face one of the first antennas.

  In the battery monitoring system, preferably, at least one of the second antennas is installed to face a plurality of the first antennas.

  In the battery monitoring system, it is preferable that a frequency of a signal used in communication between the first antenna and the second antenna is higher than a frequency of a noise source of the vehicle.

  The battery monitoring system according to the present invention has a communication line which communicably connects the second antenna and the battery monitoring unit and extends to a position where the second antenna faces the first antenna. Proximity wireless communication can be performed with the antenna, and the battery of the vehicle can be properly monitored.

FIG. 1 is a perspective view showing a mounting example of a battery monitoring system according to the embodiment. FIG. 2 is a block diagram showing a configuration example of a battery monitoring system according to the embodiment. FIG. 3 is a plan view showing an outline of a mounting example of the battery monitoring system according to the embodiment. FIG. 4 is a side view showing an outline of a mounting example of the battery monitoring system according to the embodiment. FIG. 5 is a plan view showing an outline of a mounting example of a battery monitoring system according to a modification of the embodiment. FIG. 6 is a side view showing an outline of a mounting example of a battery monitoring system according to a modification of the embodiment. FIG. 7 is a plan view showing an outline of a mounting example of a battery monitoring system according to a modification of the embodiment. FIG. 8 is a plan view showing an outline of a mounting example of a battery monitoring system according to a modification of the embodiment.

A mode (embodiment) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. Further, the components described below include those which can be easily conceived by those skilled in the art and those which are substantially the same. Furthermore, the configurations described below can be combined as appropriate. In addition, various omissions, substitutions, or modifications of the configuration can be made without departing from the scope of the present invention.

[Embodiment]
A battery monitoring system 1 according to an embodiment will be described. The battery monitoring system 1 is a system that monitors the state of a battery pack 100 as a battery mounted on a vehicle such as a hybrid vehicle or an electric vehicle.

  In this embodiment, the direction along the height of the battery pack 100 is referred to as the height direction, the electrode terminal side of the battery pack 100 is referred to as the upper side in the height direction, and the side opposite to the electrode terminals of the battery pack 100 is high. It is called the lower side in the vertical direction. The direction along the short side of the battery pack 100 is referred to as the short side direction, and the direction along the long side of the battery pack 100 is referred to as the long side direction. The short side direction is also a direction in which the plurality of battery cells 101 are arranged in the battery module 110. The long side direction is also a direction in which the plurality of battery modules 110 are arranged. The height direction, the short side direction, and the long side direction are substantially orthogonal to each other.

  The battery pack 100 supplies power to the rotating machine of the vehicle. For example, a lithium ion battery is adopted as the battery pack 100. As shown in FIG. 1, the battery pack 100 has a battery module 110 formed by arranging a plurality of battery cells 101 along the short side direction, and a plurality of battery modules 110 are arranged along the long side direction. Being formed. In each battery cell 101, each battery cell 101 main body is formed in a substantially rectangular plate shape, and positive and negative electrode terminals (not shown) are provided on one of the six outer wall surfaces. Each battery cell 101 is accommodated in the accommodation case 111 of the battery module 110 in a state of being arranged along the short side direction. Each battery module 110 is formed in a substantially rectangular parallelepiped shape as a whole by each battery cell 101 arranged along the short side direction. In the example shown in FIG. 1, in each battery module 110, four battery modules 110 are arranged along the long side direction. The respective battery modules 110 are connected to one another to constitute the battery pack 100 as one assembly. The battery pack 100 is formed in a substantially rectangular parallelepiped shape as a whole by the respective battery modules 110 arranged along the long side direction. The battery pack 100 has six wall surfaces as an assembly of the battery modules 110. In the battery pack 100, an electrode terminal of each battery module 110 is provided on one of six wall surfaces of the assembly. In this example, the battery pack 100 is provided with the electrode terminals of the respective battery modules 110 on the upper side in the height direction. Battery pack 100 has a top cover 112. The top cover 112 is formed of an insulating synthetic resin and covers the entire upper side in the height direction of each battery module 110.

  The battery monitoring system 1 includes a plurality of sensor units 10 as detection devices, and a battery monitoring device 20. The sensor unit 10 is a device that transmits the state of each battery cell 101 of the battery module 110 to the battery monitoring device 20. A plurality of sensor units 10 are provided according to the number of battery modules 110. Each sensor unit 10 is provided, for example, in the same number as the number of each battery module 110, and is provided on the sensor board of each different battery module 110. Each sensor unit 10 detects the state of each battery cell 101 of each different battery module 110, and wirelessly transmits the detected state of each battery cell 101 to the battery monitoring device 20.

  As shown in FIG. 2, each sensor unit 10 includes an RFID (Radio Frequency Identifier) circuit 11 as a close proximity wireless communication unit and a sensor unit 12. Each RFID circuit 11 is a circuit that performs wireless communication in close proximity. Each of the RFID circuits 11 is, for example, a passive type circuit driven by using a signal for power supply transmitted from the battery monitoring device 20 as a motive power. Each RFID circuit 11 can eliminate the need for an oscillator by adopting a passive method. Thus, the configuration of each RFID circuit 11 can be simplified, and the manufacturing cost can be suppressed. Each RFID circuit 11 has an RFID antenna 11a as a first antenna and a proximity wireless communication circuit 11b.

  Each RFID antenna 11a is a conductive member capable of transmitting and receiving signals. Each RFID antenna 11a is, for example, a loop antenna, but is not limited to this, and may be a spiral antenna or a flat antenna. Each RFID antenna 11a can suppress that a communication radio wave influences other devices in a vehicle or other vehicles as noise, for example by using an antenna with strong directivity. Each RFID antenna 11 a faces each reader antenna 22 described later. The RFID antenna 11a is electrically connected to the proximity wireless communication circuit 11b. The RFID antenna 11a receives the signal transmitted from the reader antenna 22, and outputs the received signal to the proximity wireless communication circuit 11b. The RFID antenna 11a receives, for example, a signal for power supply transmitted from the reader antenna 22 and a signal including a carrier wave, and outputs the received signal to the close proximity wireless communication circuit 11b. Further, the RFID antenna 11 a transmits a signal (detection signal) output from the proximity wireless communication circuit 11 b to the reader antenna 22. The RFID antenna 11a transmits, for example, a detection signal including the state of each battery cell 101 output from the proximity wireless communication circuit 11b to the reader antenna 22. The frequency of the signal used in the communication between the RFID antenna 11a and the reader antenna 22 is higher than, for example, the frequency of the noise source of the vehicle. The frequency of this signal is preferably 900 MHz or higher, which is higher than the frequency for driving an inverter or the like that is a noise source of the vehicle.

  Each close proximity wireless transfer circuit 11 b is a circuit that transmits and receives a signal. The close proximity wireless transfer circuit 11 b is connected to the RFID antenna 11 a and a CPU 12 d described later. The proximity wireless communication circuit 11 b outputs a signal for supplying power and a signal including a carrier wave from the RFID antenna 11 a. The close proximity wireless transfer circuit 11 b starts up using the power supply signal output from the RFID antenna 11 a as a motive power. Then, the close proximity wireless transfer circuit 11b outputs a signal (detection signal) including the state of each battery cell 101 to the RFID antenna 11a based on an instruction of the CPU 12d. The close proximity wireless communication circuit 11b outputs, to the RFID antenna 11a, a signal (detection signal) obtained by modulating the carrier wave based on, for example, the state of each battery cell 101 or the like. The close proximity wireless communication circuit 11b is connected to the power supply circuit 12a, and supplies power to the power supply circuit 12a instead of the battery module 110 in the abnormal state where the power supply circuit 12a can not use the power of the battery module 110.

  The sensor unit 12 is a part that measures the state of each battery cell 101. The sensor unit 12 is connected to the battery module 110 and the RFID circuit 11. The sensor unit 12 measures the state of each battery cell 101 of the battery module 110, and outputs the measured state of each battery cell 101 to the RFID circuit 11. The sensor unit 12 includes a power supply circuit 12a, a measurement circuit 12b, a memory 12c, and a CPU 12d.

  The power supply circuit 12a is a circuit that supplies power. The power supply circuit 12a is connected to, for example, the battery module 110, the measurement circuit 12b, and the CPU 12d. The power supply circuit 12a supplies the power from the battery module 110 to the measurement circuit 12b and the CPU 12d. Further, the power supply circuit 12a is connected to the close proximity wireless communication circuit 11b, and power is supplied from the close proximity wireless communication circuit 11b when an abnormality can not be supplied from the battery module 110. With this configuration, the sensor unit 10 can not supply power to the measurement circuit 12b and the CPU 12d from the battery module 110 via the power supply circuit 12a, for example, and can measure current from the proximity wireless communication circuit 11b via the power supply circuit 12a. Power can be supplied to the CPU 12 d, and normal operation can be continued.

  The measurement circuit 12 b is a circuit that measures the state of each battery cell 101 of the battery module 110. The measurement circuit 12b is connected to the power supply circuit 12a, and power is supplied from the power supply circuit 12a. The measurement circuit 12 b measures, for example, the voltage, current, temperature, and the like of each battery cell 101 as a measurement value of each battery cell 101. The measurement circuit 12b is connected to the CPU 12d, and outputs the measured value of each battery cell 101 to the CPU 12d.

  The memory 12 c is a storage unit that stores programs, data, and the like. The memory 12c is connected to the CPU 12d, and is referenced or written by the CPU 12d.

  The CPU 12 d is a circuit that controls the measurement circuit 12 b and the proximity wireless communication circuit 11 b. The CPU 12d is connected to the power supply circuit 12a, and power is supplied from the power supply circuit 12a. The CPU 12 d is connected to the measurement circuit 12 b, and the measurement value of each battery cell 101 is output from the measurement circuit 12 b. The CPU 12d is connected to the memory 12c, reads a program or data with reference to the memory 12c, and writes data in the memory 12c. The CPU 12 d writes, for example, the measurement value of each battery cell 101 output from the measurement circuit 12 b in the memory 12 c. The CPU 12 d is connected to the close proximity wireless communication circuit 11 b and outputs the measurement value of each battery cell 101 to the close proximity wireless communication circuit 11 b as the state of each battery cell 101. Then, the CPU 12 d controls the proximity wireless communication circuit 11 b to transmit a detection signal including the state of each battery cell 101.

  The battery monitoring device 20 is a device that monitors the state of the battery pack 100 of the vehicle. The battery monitoring device 20 monitors, for example, the charge state or the deterioration state of each battery cell 101 based on the state of each battery cell 101 wirelessly transmitted from each sensor unit 10. The battery monitoring device 20 monitors the state of each battery cell 101 because it is necessary to adjust the balance of the charge amount of each battery cell 101, to suppress the performance decrease of each battery cell 101 due to high voltage charging or over discharging, and the like. ing. The battery monitoring device 20 is provided, for example, on the upper side in the height direction of the top cover 112 of the battery pack 100 (see FIG. 1). The battery monitoring device 20 includes a battery monitoring controller 21 as a battery monitoring unit, a plurality of reader antennas 22, and a TEM (Transverse Electric Magnetic) line 23 as a communication line.

  The battery monitoring controller 21 is a circuit that monitors the state of the battery pack 100. The battery monitoring controller 21 includes a power supply circuit 21a, an I / F circuit 21b, a female connector 21c, a close proximity wireless communication circuit 21d, a memory 21e, and a CPU 21f. The power supply circuit 21a is a circuit that supplies power. The power supply circuit 21 a is connected to, for example, a 12 V power supply 2. The power supply circuit 21a is connected to the I / F circuit 21b, the CPU 21f, and the close proximity wireless communication circuit 21d. The power supply circuit 21a supplies the power from the power supply 2 to the I / F circuit 21b, the CPU 21f, and the proximity wireless communication circuit 21d.

  The I / F circuit 21b is a connection interface with the outside. The I / F circuit 21b is connected to the power supply circuit 21a, and power is supplied from the power supply circuit 21a. The I / F circuit 21b is connected to, for example, the CPU 21f and a host ECU (Electronic Control Unit) not shown, and outputs the state of each battery cell 101 output from the CPU 21f to the host ECU.

  The female connector 21c is a connection portion with the outside. The female connector 21c is connected to the proximity wireless communication circuit 21d. The female connector 21 c electrically connects the proximity wireless communication circuit 21 d and the TEM line 23 by fitting the male connector 23 a provided on the TEM line 23.

  The close proximity wireless communication circuit 21 d is a circuit that enables wireless communication with each sensor unit 10 in close proximity. The close proximity wireless communication circuit 21d is connected to the power supply circuit 21a, and power is supplied from the power supply circuit 21a. The close proximity wireless transfer circuit 21d is connected to the CPU 21f, and further, the TEM transmission line 23 is connected via the female connector 21c. The close proximity wireless communication circuit 21d outputs a signal for supplying power and a signal including a carrier wave for each sensor unit 10 to carry a signal to each reader antenna 22 through the TEM line 23 based on the command of the CPU 21f. Do. Note that the signal may include a signal for power supply, a carrier wave, and a command signal as various commands. The close proximity wireless communication circuit 21 d receives signals (detection signals) transmitted from the sensor units 10 via the reader antennas 22 and the TEM lines 23. The close proximity wireless transfer circuit 21 d demodulates the received signal (detection signal) and outputs the result to the CPU 21 f.

  The memory 21 e is a storage unit that stores programs, data, and the like. The memory 21 e is connected to the CPU 21 f and is referred to or written by the CPU 21 f.

  The CPU 21 f is a circuit that controls the I / F circuit 21 b and the proximity wireless communication circuit 21 d. The CPU 21 f is connected to the power supply circuit 21 a, and power is supplied from the power supply circuit 21 a. The CPU 21 f is connected to the I / F circuit 21 b and communicates with the host ECU via the I / F circuit 21 b. The CPU 21 f is connected to the memory 21 e, reads a program or data with reference to the memory 21 e, or writes data in the memory 21 e. The CPU 21 f is connected to the close proximity wireless communication circuit 21 d and performs wireless communication with the plurality of sensor units 10 via the close proximity wireless communication circuit 21 d. The CPU 21 f controls, for example, the close proximity wireless communication circuit 21 d to transmit a signal for supplying power and a signal including a carrier wave for each sensor unit 10 to carry the signal. In addition, CPU21f suppresses that a communication radio wave affects other devices in vehicles, or other vehicles as noise by adjusting electric power which outputs the signal concerned in a signal transmitted to each sensor unit 10. May be

  Each reader antenna 22 is a conductive member capable of transmitting and receiving signals. Each reader antenna 22 is, for example, a loop antenna, but is not limited to this, and may be a spiral antenna or a flat antenna. Each reader antenna 22 can suppress that a communication radio wave influences other apparatuses in vehicles, or other vehicles as noise, for example by using an antenna with strong directivity. Each reader antenna 22 is provided on the top cover 112 at a position facing the RFID antenna 11 a of each sensor unit 10. Each reader antenna 22 is formed, for example, in an insulator such as a flexible flat cable (FFC). Each reader antenna 22 is provided with the FFC in which the reader antenna 22 is formed on the upper side in the height direction of the top cover 112 of the battery pack 100. In each reader antenna 22, for example, the FFC on which the reader antenna 22 is formed is attached and fixed to the upper surface cover 112. Each reader antenna 22 opposes each RFID antenna 11a along the height direction, with the top cover 112 covering each battery module 110 from the upper side in the height direction. The battery pack 100 shown in FIGS. 3 and 4 has a first battery module group 110A in which four battery modules 110 are arranged along the long side direction, and four battery modules 110 arranged in the long side direction. The case where it has the 2nd battery module group 110B is illustrated. The first battery module group 110A and the second battery module group 110B are arranged side by side along the short side direction. Each reader antenna 22 is provided, for example, in the same number as each RFID antenna 11a, and each opposes a different RFID antenna 11a, and each one-to-one with each RFID antenna 11a. That is, in each reader antenna 22, one reader antenna 22 faces one RFID antenna 11a. The distance between the reader antennas 22 and the RFID antennas 11a in the opposing direction (height direction) is several mm to 5 cm. When the distance in the opposing direction between each reader antenna 22 and each RFID antenna 11a is wider than 5 cm, the communication radio wave between each reader antenna 22 and each RFID antenna 11a is the other device in the vehicle or another in the vehicle. May affect the vehicle as noise. Each reader antenna 22 is connected to the proximity wireless communication circuit 21 d via the TEM line 23. Each reader antenna 22 transmits a signal output from the proximity wireless communication circuit 21 d via the TEM line 23 to each RFID antenna 11 a. Each reader antenna 22 transmits, for example, a signal for supplying power, which is output from the proximity wireless communication circuit 21 d, and a signal including a carrier wave, to each RFID antenna 11 a. Each reader antenna 22 receives a signal (detection signal) transmitted from each RFID antenna 11 a, and outputs the received signal (detection signal) to the close proximity wireless communication circuit 21 d via the TEM line 23. Each reader antenna 22 receives a detection signal including the state of each battery cell 101 transmitted from each RFID antenna 11a, for example, and outputs the received detection signal to the close proximity wireless communication circuit 21d via the TEM line 23.

  The TEM line 23 is a flat coaxial line which communicably connects each reader antenna 22 and the battery monitoring controller 21. The TEM line 23 is formed, for example, on the same insulator such as FFC as the reader antenna 22. The TEM line 23 and the reader antenna 22 are formed on the same surface of the FFC. The TEM line 23 connects the proximity wireless communication circuit 21 d to each reader antenna 22. The TEM line 23 has, for example, a communication path for each reader antenna 22, and connects the close proximity wireless communication circuit 21d and each reader antenna 22 individually. That is, the TEM line 23 has a plurality of communication paths, and communicably connects the proximity wireless communication circuit 21 d and each reader antenna 22 individually. The TEM line 23 may have a common communication path with each reader antenna 22, and the close proximity wireless communication circuit 21d and each reader antenna 22 may be connected by a time division multiplexing method or the like. The TEM line 23 extends to a position where each RFID antenna 11 a faces each reader antenna 22. That is, the TEM line 23 extends from the close proximity wireless communication circuit 21 d to each reader antenna 22. Specifically, the TEM line 23 extends from the proximity wireless communication circuit 21 d to the connection terminal of each reader antenna 22 installed at equal intervals along the long side direction. The TEM line 23 is electrically connected to the connection terminal of each reader antenna 22. In the TEM line 23, a male connector 23a is provided at an end of the close proximity wireless communication circuit 21d opposite to each reader antenna 22 (see FIG. 2). The TEM line 23 is electrically connected to the proximity wireless communication circuit 21 d by fitting the male connector 23 a of the TEM line 23 to the female connector 21 c of the proximity wireless communication circuit 21 d. In the TEM line 23, the FFC on which the TEM line 23 and the reader antenna 22 are formed is provided on the upper side in the height direction of the upper surface cover 112 of the battery pack 100.

  As described above, the battery monitoring system 1 according to the embodiment includes the sensor unit 10 and the battery monitoring device 20. The sensor unit 10 includes an RFID circuit 11 and a sensor unit 12. The RFID circuit 11 has an RFID antenna 11a capable of transmitting a signal. The sensor unit 12 is connected to the RFID circuit 11 and the battery pack 100 of the vehicle, and outputs the state of the battery pack 100 to the RFID circuit 11. The sensor unit 10 transmits a detection signal including the state of the battery pack 100 from the RFID antenna 11a. The battery monitoring device 20 is configured to include a reader antenna 22 and a battery monitoring controller 21. The reader antenna 22 is a conductive member capable of receiving a detection signal. The battery monitoring controller 21 is connected to the reader antenna 22 and monitors the state of the battery pack 100 based on the detection signal transmitted from the sensor unit 10. The battery monitoring device 20 has a TEM line 23 which communicably connects the reader antenna 22 and the battery monitoring controller 21 and extends to a position where the reader antenna 22 faces the RFID antenna 11 a.

  With this configuration, the battery monitoring system 1 is installed with the RFID antenna 11a and the reader antenna 22 facing each other, so that close proximity wireless communication can be performed between the RFID antenna 11a and the reader antenna 22. With this configuration, the battery monitoring system 1 can suppress the influence of the communication radio wave in the communication between the RFID antenna 11a and the reader antenna 22 on other devices in the vehicle and other vehicles as noise. As a result, the battery monitoring system 1 can properly monitor the battery pack 100 of the vehicle. Further, in the battery monitoring system 1, since the RFID antenna 11 a and the battery monitoring controller 21 are connected via the TEM line 23, the reader antenna 22 may be provided at a free position by adjusting the length of the TEM line 23. Can. Thereby, the battery monitoring system 1 can improve the installation property of the reader antenna 22 with respect to the RFID antenna 11a. Further, in the battery monitoring system 1, since the battery monitoring device 20 and the sensor unit 10 are connected in a non-contact manner so as to be communicable, communication wiring can be made unnecessary, and the mountability of the battery monitoring system 1 is improved. it can. In particular, in the electric vehicle, the mounting area of the battery pack 100 is increased as the capacity of the battery is increased, and the wiring of the communication line tends to be relatively long, and the wiring for communication tends to be complicated. When installed in such an electric vehicle, the battery monitoring system 1 can eliminate the need for communication wiring, so that it is possible to omit the wiring work for communication and the space for communication wiring. it can.

  In the battery monitoring system 1, one reader antenna 22 is installed opposite to one RFID antenna 11a. With this configuration, the battery monitoring system 1 can perform close proximity wireless communication between the battery monitoring device 20 and the sensor unit 10, and the influence of the communication radio wave on other devices in the vehicle or other vehicles as noise is realized. It can be suppressed.

  In the battery monitoring system 1, the frequency of the signal used in the communication between the RFID antenna 11a and the reader antenna 22 is higher than the frequency of the noise source of the vehicle. With this configuration, the battery monitoring system 1 can be made less susceptible to noise generated from other devices in the vehicle. Therefore, the battery monitoring system 1 can suppress the decrease in the success rate of communication, and can suppress the loss of real-time communication. As a result, the battery monitoring system 1 can suppress the deterioration of the communication quality.

[Modification]
Next, modifications of the embodiment will be described. In the above description, an example in which each reader antenna 22 is opposed to each RFID antenna 11 a in a one-to-one manner has been described, but the present invention is not limited thereto. In the battery monitoring system 1A according to the modification, as shown in FIGS. 5 and 6, each reader antenna 22A faces each RFID antenna 11a in a one-to-many relationship. The number of each reader antenna 22A is smaller than that of each RFID antenna 11a in the upper surface cover 112. Then, each reader antenna 22A faces each different RFID antenna 11a, and each faces each RFID antenna 11a in a one-to-many relationship. That is, each reader antenna 22A is installed with one reader antenna 22A facing the plurality of RFID antennas 11a. In this case, different parts of each reader antenna 22A are installed to face each RFID antenna 11a. In the battery pack 100, for example, as viewed in the height direction, the sensor unit 10 is installed at each corner of each battery module 110 so that the four sensor units 10 of each battery module 110 gather at one place. Then, each reader antenna 22A is installed such that one reader antenna 22A faces the RFID antenna 11a of the four sensor units 10. With this configuration, the battery monitoring system 1A according to the modification can communicate with each RFID antenna 11a by a smaller number of reader antennas 22A than the battery monitoring system 1 according to the embodiment. Thereby, battery monitoring system 1A can simplify the configuration and can suppress the manufacturing cost.

  Further, in the above description, although the example in which each reader antenna 22 and the TEM track 23 are provided on the upper surface cover 112 has been described, the present invention is not limited to this. In the battery monitoring system 1B according to the modification, as shown in FIG. 7, each reader antenna 22 and the TEM line 23 may be provided between the first battery module group 110A and the second battery module group 110B. The battery pack 100 has a space portion P (a gap) between the first battery module group 110A and the second battery module group 110B. That is, the battery pack 100 includes the first inner side wall portion 113 on one side in the short side direction of the first battery module group 110A and the second inner side wall portion 114 on one side in the short side direction of the second battery module group 110B. It has a space portion P which is sandwiched. Each sensor unit 10 is provided in the first inner side wall portion 113 or the second inner side wall portion 114 corresponding to each battery module 110 in the space portion P. Each reader antenna 22 of the battery monitoring device 20 has, for example, an FFC on which the reader antenna 22 and the TEM line 23 are formed on the first inner side wall 113 and the second inner side wall 114. And each reader antenna 22 respond | corresponds to the RFID antenna 11a of each sensor unit 10 along a short side direction. As described above, in the battery monitoring system 1B according to the modification, since each reader antenna 22 and the TEM track 23 are provided between the first battery module group 110A and the second battery module group 110B, the height of the battery pack 100 is increased. It is effective when there is a restriction in the installation in the height direction.

  Further, each reader antenna 22 and the TEM line 23 may be provided outside the battery pack 100 as shown in FIG. For example, in the battery pack 100, the first battery module group 110A and the second battery module group 110B are arranged along the short side direction. The battery pack 100 includes a first outer wall portion 115 provided on the opposite side of the first battery module group 110A to the second battery module group 110B in the short side direction, and a first battery module of the second battery module group 110B. And a second outer wall 116 provided on the opposite side to the group 110A. Each sensor unit 10 is provided on the first outer wall 115 or the second outer wall 116 corresponding to each battery module 110. And each reader antenna 22 respond | corresponds to the RFID antenna 11a of each sensor unit 10 along a short side direction. As described above, in the battery monitoring system 1C according to the modification, each reader antenna 22 and the TEM line 23 are the first outer wall 115 of the first battery module group 110A or the second outer wall 116 of the second battery module group 110B. Therefore, the height of the battery pack 100 can be reduced, which is effective when the installation in the height direction is limited.

  Although the communication line connecting the reader antenna 22 and the battery monitoring controller 21 has been described as an example using the TEM line 23, it is not limited to this, and may be, for example, a twisted wire.

  Although the battery monitoring device 20 has described the example in which the reader antenna 22 and the TEM line 23 are formed on an insulator such as FFC and provided on the upper surface cover 112 or the like, the present invention is not limited thereto. The battery monitoring device 20 may be formed by printing the reader antenna 22 and the TEM line 23 directly on the upper surface cover 112 or the like.

  In the battery monitoring system 1, each reader antenna 22 may have a configuration in which each of the reader antennas 22 faces each RFID antenna 11 a in a one-to-one manner, and a configuration in which each reader antenna 22 faces each RFID antenna 11 a in a one-to-many relationship .

  Although the RFID circuit 11 has been described as a passive circuit, it may be an active circuit capable of spontaneously transmitting a signal.

1, 1A, 1B, 1C Battery monitoring system 11a RFID antenna (first antenna)
11 b Proximity wireless communication circuit 11 RFID circuit (proximity wireless communication unit)
100 battery pack (battery)
12 sensor unit 10 sensor unit (detection device)
22 Reader antenna (second antenna)
21 Battery monitoring controller (battery monitoring unit)
20 Battery Monitoring Device 23 TEM Line (Communication Line)

Claims (4)

A proximity wireless communication unit having a first antenna capable of transmitting a signal, and a sensor unit connected to the proximity wireless communication unit and a battery of the vehicle and outputting the state of the battery to the proximity wireless communication unit. A detection device for transmitting a detection signal including the state of the battery from the first antenna;
A battery monitoring apparatus comprising: a second antenna capable of receiving the detection signal; and a battery monitoring unit connected to the second antenna to monitor the state of the battery based on the detection signal transmitted from the detection device And
The battery monitoring device includes a communication line communicably connecting the second antenna and the battery monitoring unit, and having a communication line extending to a position where the second antenna faces the first antenna. system.   The battery monitoring system according to claim 1, wherein at least one of the second antennas is installed to face the one of the first antennas.   The battery monitoring system according to claim 1, wherein at least one second antenna is installed to face a plurality of the first antennas.   The battery according to any one of claims 1 to 3, wherein a frequency of a signal used in communication between the first antenna and the second antenna is a frequency higher than a frequency of a noise source of the vehicle. Monitoring system.

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