JP2010203848A - Monitoring device of battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery monitoring device constituted so as to be able to easily detect a shot-circuit between an electrode terminal or a conductive material and an exterior body. <P>SOLUTION: This device includes a battery 11 wherein a power generation element 111 is sealed by exterior members 114, 115 including a metal layer and an insulating layer, a detection part 6 for detecting a battery state, a control part 7 for receiving a detection result detected by the detection part, and a communication line for connecting the battery 11, the detection part 6 and the control part 7 together. The insulating layer insulates the power generation element 111 from the metal layer, and the detection part 6 transmits the battery 11 state as a transmission signal to the control part 7 through the communication line, and the metal layer is connected electrically to the communication line through a connection line. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

    The present invention relates to a battery monitoring device.

  In a secondary battery covered with a laminate sheet, in order to detect a short circuit between the cathode and the metal of the laminate sheet, a battery that connects the anode and the metal of the laminate is known (Patent Document 1).

JP 2000-353502 A

  However, in the configuration of the conventional secondary battery, there is a possibility that a minute short circuit cannot be detected.

  Therefore, the present invention provides a battery monitoring device that can detect even a slight short circuit.

The present invention solves the above-mentioned problems by providing a connection line that connects the exterior material and the communication line, and detecting a change in the state of the communication signal passing through the communication line when a short circuit occurs in the battery. .

  According to the present invention, when a short circuit occurs in the battery, the power generation element or the electrode terminal and the connection line are electrically connected, and the communication signal detects a change in the communication signal caused by conducting the connection line. In addition, it is possible to easily detect a short circuit between the electrode terminal or the power generation element and the exterior member.

It is a block diagram which shows the battery monitoring apparatus which concerns on embodiment of invention. It is an electric circuit diagram which shows the detection part of the monitoring apparatus of FIG. It is a top view which shows the battery of FIG. It is AA sectional drawing of FIG. It is sectional drawing equivalent to the BB cross section of FIG. 3 which shows the battery which concerns on other embodiment of invention.

Hereinafter, embodiments of the invention will be described with reference to the drawings.
<< First Embodiment >>
FIG. 1 is a diagram showing a battery monitoring device 5 according to an embodiment of the invention, and is a block diagram showing a drive system of a motor 4. 2 is a circuit diagram showing the connection between the voltage detection circuit 6 and the battery 11 in FIG. FIG. 3 is a plan view showing the battery 11 of FIG. 1 and shows the connection between the connection line 8 and the communication wiring 69 and the battery 11. 4 is a diagram showing the connection of the connection line 8 and the communication wiring 69 at the end of the battery 11 of FIG. 3, and is a cross-sectional view taken along the line AA of FIG.

  The assembled battery 1 shown in FIG. 1 is configured by connecting a plurality of batteries 11 in series, and both electrodes thereof are connected to an inverter 3 via a power supply line 2. The motor 4 is connected to the inverter 3 and is driven by an alternating current converted by the inverter 3.

  The driving system of the motor 4 by the assembled battery 1 shown in the figure is an example for explaining the battery monitoring device 5 according to this embodiment, and a plurality of batteries 11 are connected in series as in this example. In addition to configuring the assembled battery 1, the assembled battery 1 can also be configured by connecting a plurality of batteries 11 in series and / or in parallel. Further, when the power supply target of the assembled battery 1 is a DC motor, the inverter 3 can be omitted, and the power supply target can be a load other than the motor 4.

  The battery monitoring device 5 includes a voltage detection device 6 connected to each battery 11 and a control circuit 7 that receives a signal from the voltage detection device 6 and controls charging / discharging of each battery 11. The voltage detection device 6 of this example corresponds to the detection unit of the invention, and the control circuit 7 corresponds to the control unit.

  The voltage detection device 6 includes a microprocessor unit (hereinafter abbreviated as MPU) 61 that detects the state of each battery 11 and transmits the state of each battery to the control circuit 7 using an AC signal as a communication signal. Wiring 68a and 68b for detecting the voltage, and communication wiring 69 for transmitting the detected battery state as an AC signal are provided. The wiring 68 a is connected to the positive electrode of the battery 11, the wiring 68 b is connected to the negative electrode of the battery 11, and the communication wiring 69 is connected to the positive electrode side of the battery 11. The MPU 61 is grounded by a communication wiring 69c.

  Coupling capacitors 62 and 63 for removing a direct current component are connected to communication wires 69 and 69c, respectively. When the batteries 11 are connected in series and the communication wiring 69 is connected to each battery, a different direct current component corresponding to the potential of each battery 11 is placed on a signal flowing through the communication wiring 69, so that the control circuit 7 It becomes difficult to recognize the signal. Therefore, in this example, coupling capacitors 62 and 63 are connected to the communication wires 69 and 69c in order to remove the DC component.

  In this example, an AC signal is used as a communication signal. However, for example, a digital signal may be used, and the wirings 68a, 68b, and 69c are not necessarily provided for all batteries.

  The control circuit 7 has an MPU 71 that receives the communication signal of the state of the assembled battery 1 transmitted from the voltage detection device 6 and controls the output of each battery 11 based on the received communication signal. The MPU 71 and the power supply line 2 And a wiring 74 for grounding the MPU 71. Further, a coupling capacitor 73 is connected between the wirings 72 in order to remove a direct current component.

  The MPU 71 transmits a signal for causing each MPU 61 to detect the voltage of the battery 11 to the MPU 61 via the wiring 72, the power supply line 2, and the communication wiring 69. Receiving this, the MPU 61 detects the voltage of the battery 11 through the wirings 68a and 68b, and transmits the detected voltage value to the MPU 71 through the communication wiring 69, the power supply line 2 and the wiring 72 as an AC signal.

  Here, a communication signal to be transmitted from the MPU 61 to the MPU 71 is transmitted through the battery 11, but since the communication signal is an AC signal and an output from the battery 11 is a DC signal, each signal is transmitted through the same wiring. it can. And MPU71 which received the communication signal can grasp | ascertain the capacity | capacitance of each battery 11 based on the said communication signal.

  In addition, when the battery capacity of the battery 11 in the assembled battery 1 is lower than the battery capacity of the other batteries 11, the MPU 71 issues a discharge instruction to the other batteries 11 and each battery of the assembled battery 1. 11 capacity is made uniform. In this way, the MPU 71 grasps the battery capacity of each battery 11, prevents overcharge or overcharge, and further manages the output of the capacity of the battery 11.

  The connection line 8 is connected between the battery 11 and the communication wiring 69, one end of the connection line 8 is between the exterior material 114 of the battery 11, and the other end of the connection line 8 is between the MPU 61 and the coupling capacitor 62. It is connected. The power generation element 111 and the exterior material 114 are not shown in FIG. 1 and refer to FIG. Since the exterior material 114 and the power generation element 111 of the battery 11 are insulated, the connection line 8 does not always function as a part of the circuit of the drive system shown in the figure. In this figure, since the connection line 8 does not always function as a part of the system circuit, a connection portion with the exterior material 114 is indicated by a dotted line.

  On the other hand, when a short circuit occurs in the battery 11 and the power generation element 111 of the battery 11 and the exterior material 114 are electrically connected, the battery 11 and the connection line 8 are electrically connected. Thus, when the power generation element 111 of the battery 11 and the exterior material 114 are not conductive, the connection line 8 does not function as a conducting wire, so that the communication signal passing through the communication wiring 69 does not flow through the connection line 8, and the MPU 61 or MPU 71 The communication signal is received normally. However, for example, when a short circuit occurs due to a crack or the like in the insulating layer in the battery 11 and the power generation element of the battery 11 and the exterior material are electrically connected, a communication signal passing through the communication wiring 69 also flows through the connection line 8. . Therefore, the gain of the communication signal received by the MPU 71 or MPU 61 is lower than that when the communication signal is normally received. Thereby, the control circuit 7 can grasp the short circuit in the battery 11 from the gain of the communication signal. In addition, the specific structure of the connection of the connection line 8 and the exterior material 114 of the battery 11 will be described later.

  The abnormality signal transmission means 9 is connected to the MPU 71 and transmits a signal indicating that an abnormality has occurred in the battery 11 based on a signal from the MPU 71 to the outside of the drive system. The vehicle driver can easily recognize that an abnormality has occurred in the assembled battery 1 by, for example, turning on a warning lamp on the basis of a signal emitted from the abnormality signal transmission means 9.

  The abnormal signal transmission means 9 shown in the figure is configured separately from the control circuit 7, but may be a partial configuration of the control means. The means for notifying the user of the system of the abnormality is not limited to the warning lamp, but may be notified by voice or the like, for example. The power supply line 2, the communication wiring 69, and the wiring 72 of this example correspond to the “communication line” of the present invention.

  Next, the configuration of the connection circuit with the battery 11 will be described using FIG. 2 while showing the specific configuration of the voltage detection circuit 6. The voltage detection circuit 6 has a wiring 611 connected to the positive terminal of the battery 11 and a wiring 612 connected to the negative terminal. The wiring 611 is a power input terminal Vcc of the microprocessor 61 (hereinafter abbreviated as MPU 61). The wiring 612 is connected to the ground terminal GND1 of the MPU 61. As a result, driving power is supplied to the MPU 61.

  Further, the wiring 68a is connected in parallel to the wiring 611 connected to the positive terminal of the battery 11, and the wiring 68b is connected in parallel to the wiring 612 connected to the negative terminal. The wiring 68a connected to the positive terminal of the battery 11 is provided with resistors 641 and 642 for detecting the voltage of the battery 11, and the other end of the wiring 68a is connected to the voltage detection terminals VD1 and VD2 of the MPU 61. Has been. Further, a capacitor 643 is provided in the wiring 68b electrically connected to the negative electrode terminal of the battery 11, and the other end of the wiring 68a is connected to the wiring 68a connected to the voltage detection terminal VD1. The two resistors 641 and 642 and the capacitor 643 detect the voltage between the terminals of the battery 11.

  The detected inter-terminal voltage value of the battery 11 is converted into an AC signal of a specific frequency band by the internal function of the MPU 61, and is transmitted from the communication signal output terminal Out via the communication wires 69 a, 69, 611 and the power supply line 2. It is sent to the control circuit 7. At this time, in order to determine the reference potential of the AC communication signal, the communication wiring 69 c is connected to the communication signal ground terminal GND 2 of the MPU 61, and the battery that houses the assembled battery 1 of this example via the coupling capacitor 63. Connected to a grounding point such as a case. Since the ground point of the battery case or the like has the same potential in each battery 11, the reference potential of the AC communication signal sent from the communication signal output terminal Out to the control circuit 7 is equal in any voltage detection circuit 6. The frequency band of the AC signal converted by the MPU 61 is set so as not to be mixed with the AC signal generated from the inverter 3 and the DC / DC converter (not shown). Further, when the battery monitoring device of the present embodiment is mounted on a vehicle or the like, there is a possibility that noise accompanying the vibration of the vehicle may also affect, and the frequency band of such noise components is set to be avoided.

  A communication wiring 69 is connected in parallel to the wiring 611 connected to the positive terminal of the battery 11, and a coupling capacitor 62 is provided on the communication wiring 69. Further, the communication wiring 69 on the other end side of the coupling capacitor 62 is branched in parallel to the two communication wirings 69a and 69b, and one communication wiring 69a is connected to the communication signal output terminal Out of the MPU 61, and the other communication wiring. 69b is connected to the communication signal input terminal In of the MPU 61.

The communication wiring 69 b connected to the communication signal input terminal In of the MPU 61 is provided with resistors 651 and 652 and a capacitor 653 that constitute the band-pass filter 65. This band pass filter 65 includes a high pass filter that removes low frequency band noise and extracts only a high frequency band signal, and a low pass filter that removes high frequency band noise and extracts only a low frequency band signal. This is a filter circuit having both functions. In addition, the code | symbol 654 shown in the figure is a rectifier diode. Thereby, the band which is not mixed with the AC signal generated from the inverter 3 and the DC / DC converter (not shown) is extracted, and further, the noise component of the vehicle when the battery monitoring device of this embodiment is mounted on the vehicle or the like is further increased. Can be reduced.

  In addition, although the voltage detection apparatus 6 is used in this embodiment as a detection part of invention and the voltage between the terminals of the battery 11 is detected, you may measure not only a voltage between terminals but the current between terminals. When detecting the current, the MPU 61 can measure the current value of the predetermined time flowing through the wires 68a and 68b using, for example, a current integrating circuit, and can grasp the capacity of the battery 11 based on the current value. As in the present embodiment, the battery capacity based on the current value may be transmitted as a communication signal.

  Next, a specific configuration of the battery 11 of FIG. 1 and a specific connection example of the battery 11, the communication wiring 69, and the connection line 8 will be described with reference to FIGS. The battery 11 includes an upper exterior material 114 and a lower exterior material 115 that cover the power generation element 111, a positive electrode tab 112, and a negative electrode tab 113. Although not shown in detail in the power generation element 111, a positive electrode layer connected to the positive electrode tab 112 and coated with a positive electrode active material, and a negative electrode layer connected to the negative electrode tab 113 and coated with a negative electrode active material, These are laminated via an insulating separator. The positive electrode layer has a structure in which a positive electrode material such as lithium manganese oxide, manganese dioxide, or lithium nickel oxide is bound to a current collector made of aluminum or the like. The negative electrode layer has a structure in which a negative electrode material such as graphite, carbon black, activated carbon, and coke is bound to a current collector made of copper or the like. As the separator, a polyolefin microporous separator or the like is used.

  As shown in FIG. 4, the upper exterior member 114 and the lower exterior member 115 are made of, for example, polyethylene, modified polyethylene, polypropylene, modified polypropylene, or ionomer on one surface (inner surface of the battery 11) of a metal foil such as an aluminum foil. It is laminated with a resin and the other surface (the outer surface of the battery 11) is laminated with a polyamide-based resin or a polyester-based resin, and has flexibility. The metal foil 1141 of the upper exterior member 114 is the metal layer 1141, the outer surface of the battery of the upper exterior member 114 is the insulating layer 1142, the inner surface of the battery of the upper exterior member 114 is the insulating layer 1143, and the metal foil of the lower exterior member 115 is the metal layer. 1151, the outer surface of the battery of the lower exterior member 115 is shown as an insulating layer 1152, and the inner surface of the battery of the lower exterior member 115 is shown as an insulating layer 1153. The upper exterior member 114 is laminated on the main surface of one positive electrode layer or the negative electrode layer, and the lower exterior member 115 is laminated on the main surface of the other positive electrode layer or negative electrode layer.

  The upper exterior member 114 and the lower exterior member 115 enclose the power generation element 111, a part of the positive electrode tab 112 and a part of the negative electrode tab 113, and form a space formed by the exterior members 114 and 115. After injecting a liquid electrolyte having a lithium salt such as lithium perchlorate, lithium borofluoride, or lithium hexafluorophosphate as a solute into the organic liquid solvent, this space is sucked to be in a vacuum state, and then the exterior member 114 , 115 is sealed by heat-sealing the entire periphery of the outer peripheral end portion of the substrate by hot pressing. A portion where the upper exterior member 114 and the lower exterior member 115 are joined by this heat fusion is shown as a joint portion 116 in FIG.

  Note that the metal layers 1141 and 1151 and the insulating layers 1142, 1143, 1152, and 1153 in this example correspond to the metal layer and the insulating layer of the exterior member of the invention, respectively.

  The power supply line 2 is electrically connected to the positive electrode tab 112, and the communication wiring 69 is connected to the power supply line 2 via the coupling capacitor 62. The other end of the communication wiring 69 is connected to the MPU 61, and the other end of the power supply line 2 is connected to the inverter 3 and the MPU 71.

  The insulating layer 1142 of the upper exterior member 114 is provided with a notch 118, and a part of the metal layer 1141 of the upper exterior member 114 is exposed from the notch 118. Then, one end of the connection line 8 is electrically connected to a part of the metal layer 1141 exposed from the notch 118. Further, the end portion of the battery 11 including the connection point between the connection line 8 and the metal layer 1141 is covered with a seal member 117. Thereby, the connection line 8 is connected to the exterior member 114 of the battery 11. The other end of the connection line 8 is connected to a communication line 69 and is connected between the coupling capacitor 62 and the MPU 71.

  Note that the connection line 8 shown in FIG. 4 is not limited to being connected to the metal layer 1141 of the exterior member 114 but may be connected to the exterior member 1151. Moreover, the connection part of the connection line 8 and the metal layer 1141 or the metal layer 1151 is not restricted to the structure shown in FIG. For example, a tab may be provided in advance on the metal layer 1141 of the exterior member for connection with the connection line 8, and the tab and the connection line may be connected. Further, the tab does not necessarily need to be an electrode tab having a different structure from the metal layer 1141, and a part of the metal layer can be used as a tab and can be formed to be exposed from the exterior member 114.

  In FIG. 4, since there is an insulating layer 1143 between the positive electrode tab 112 and the metal layer 1141 of the exterior member 114, the positive electrode tab 112 and the metal layer 1141 are insulated. Therefore, the impedance of the path of the connection line 8 is very high, and the communication signal passing through the communication wiring 69 is not branched and does not flow to the connection line 8. However, when a short circuit occurs in the exterior member due to a crack in the insulating layer 1143 and the metal layer 1141 and the positive electrode tab 112 are electrically connected, the impedance of the path of the connection line 8 is lowered, and the communication signal is transmitted to the connection line. 8 also branches and flows. For this reason, the gain of the communication signal is lowered.

  As described above, the MPU 71 manages the electric capacity of each battery 11 by using the MPU 61 connected to each battery 11. However, when the short circuit described above occurs in the battery 11 in the assembled battery 1, the short circuit occurs. It is possible to grasp that the gain of the communication signal transmitted by the MPU 61 connected to the battery in which the battery has occurred has decreased. Specifically, the MPU 71 can grasp that the gain has decreased by comparing the gain of the communication signal with another normal battery voltage.

  Alternatively, the MPU 71 can store the gain of the battery 11 before short-circuiting in a memory or the like, and can determine the presence or absence of a short-circuit by determining that a short-circuit has occurred in the battery 11 when a gain change greater than the setting occurs. Alternatively, the MPU 71 has a preset value as a communication signal gain based on the normal battery 11 when the drive system of this example is designed. When the communication gain falls below the set value, the MPU 71 malfunctions due to a short circuit or the like. It is also possible to determine that this has occurred.

  In this example, a short between the electrode tab and the exterior material has been described as an example of a short in the battery. However, the short circuit is not limited to the electrode tab, for example, between the power generation element 11 and the metal layer 1141 of the exterior material 114. Even if it occurs, the connection line 8 becomes conductive, and the MPU 71 can detect the short circuit by detecting the change in the gain of the communication signal. Moreover, although the MPU 71 has been described as an example of detecting a change in gain, the MPU 61 can detect a change in gain based on a short circuit of the battery 11. That is, when the MPU 61 receives a communication signal indicating the start of detection of the battery 11 transmitted from the MPU 71, for example, if no short circuit occurs in the battery 11, the communication signal does not pass through the connection line 8 and passes through the communication wiring 69. Flow to the MPU 61. However, when a short circuit occurs, the communication signal also branches to the connection line 8, so that the gain of the communication signal flowing through the MPU 61 also decreases. Accordingly, the MPU 61 can also detect a short circuit in the battery 11 based on whether or not the gain of the communication signal has changed.

    Here, as an embodiment of the battery monitoring apparatus of this example, a battery 11 is assigned as one cell per cell, a cell voltage per cell is set to 3.8 V, a cell capacity is set to 50 Ah, and a series battery system of 100 cells ( A total voltage of 380 V) was produced. The capacitance of the coupling capacitor 62 was 4700 pF, and the frequency of the communication signal was set to 2 MHz. And in order to make the inside of the battery 11 pseudo-short, between the negative electrode tab 113 and the metal layer 1151 of the exterior member 114 for the cell of the second battery 11 from the positive electrode side of the assembled battery 1 shown in FIG. Connected with a resistance of 15Ω. In this state, when a communication signal was passed through the drive system of this example and the gain of the communication signal was measured, the gain of the communication signal was reduced by about 40% compared to the communication signal before connecting the 15Ω resistor. .

  Further, the rate of decrease in the gain of the communication signal due to the short circuit can be set by the magnitude of the impedance of the coupling capacitor 62. That is, assuming that the impedance of the short-circuit resistance caused by the short circuit in the battery 11 is X and the impedance of the coupling capacitor 62 is Z, when X = Z, the gain reduction rate is 50%, and X = Z / 10 In this case, the gain reduction rate is less than 10%. Therefore, the short-circuit resistance to be detected can be set by adjusting the frequency of the communication signal or the capacitance of the coupling capacitor.

  As described above, the battery monitoring device according to the present embodiment communicates when a short circuit occurs in the battery 11 by connecting the connection line 8 between the exterior member 114 or the exterior member 115 of the battery 11 and the communication wiring 69. Since a communication signal flows not only in the wiring 69 but also in the connection line 8, a short circuit in the battery 11 can be grasped by detecting a change in the communication signal before and after the communication signal flows through the connection line 8. be able to.

  If the exterior member 114 to which the connection line 8 is electrically connected and the power generation element 111 are insulated, the impedance of the connection line 8 is very high, and no communication signal flows through the connection line 8. When the exterior member 114 and the power generation element 111 are brought into conduction due to a short circuit in 11, the impedance of the connection line 8 decreases and a communication signal also flows out to the connection line 8. Therefore, in the present embodiment, even if the short in the battery is a short, the impedance change before and after the exterior member 114 and the power generation element 111 is large, and the gain of the communication signal changes. Even small shorts can be detected.

  Furthermore, the drive system of this example is mounted on a vehicle or the like, and it is possible to detect a short circuit in the battery 11 that occurs with time due to the vibration of the vehicle or the like. In addition, when connecting a large number of batteries 11 such as a vehicle battery to make a battery pack with a large capacity, the voltage detection between the terminals of each battery has a low change in the voltage between the terminals, and there is a possibility that the short circuit cannot be reliably detected. This embodiment is particularly effective in a battery driving system having a large capacity because a short circuit is detected using a gain change of a signal line of power line communication.

  In the present embodiment, since the other end of the connection line 8 is connected to the communication wiring 69 between the coupling capacitor 62 and the voltage detection device 6, the capacitance of the coupling capacitor 62 or the frequency of the communication signal is adjusted. Thereby, the short circuit resistance by the short in the battery 11 which the voltage detection apparatus 6 or the control circuit 7 detects can be set. Thereby, since the short circuit resistance at the time of a short circuit can be set according to the characteristic of the battery 11 used for the assembled battery 1, the battery monitoring apparatus of this example detects the short circuit in the battery 11 more reliably. be able to.

  Further, in the present embodiment, since the abnormality signal transmitting means 9 is provided, when the gain of the communication signal changes and a short circuit occurs in the battery 11, the user is notified that the abnormality has occurred in the battery 11. Therefore, the user can be notified more quickly that a short circuit has occurred in the assembled battery.

  Further, in the present embodiment, since the communication line has the band-pass filter 65, it is possible to filter the noise generated by the vibration of the vehicle, the signal generated by the inverter 3 and the like, and transmit / receive the communication signal passing through the communication wiring 69.

  In the present embodiment, since the connection point between the connection line 8 and the exterior member is covered with the seal member 117, the airtightness in the exterior member can be further ensured.

<< Second Embodiment >>
FIG. 5 is a cross-sectional view of a battery 11 according to another embodiment of the invention, and is a cross-sectional view taken along line BB of FIG. In this example, the drive system including the battery detection device is not different from the first embodiment described above, but the metal layer 1141 of the upper exterior member 114 and the metal layer of the lower exterior member 115 at the joint 116 of the battery 11. The difference is that 1151 is connected. Since the other configuration is the same as that of the first embodiment described above, the description thereof is incorporated.

  In this example, the insulating layer 1143 and the insulating layer 1153 are formed to be shorter than the metal layer 1141 and the metal layer 1151, and when the exterior material 114 and the exterior material 115 are sealed by the joint portion 116, the metal layer 1141. And one end of the metal layer 1151 is joined. Then, the insulating layer 1142 and the insulating layer 1152 are fused so as to cover a joint portion between the metal layer 1141 and the metal layer 1151. As a result, the metal layer 1141 and the metal layer 1151 are sealed in an electrically connected state in the exterior member. Further, as shown in FIG. 4, since the connection line 8 is electrically connected to the metal layer 1141 at the electrode end including the electrode tab 112, the connection line 8 is connected to the metal layer 1151 in addition to the metal layer 1141. It will be electrically connected. Thereby, for example, even if a short circuit occurs between the conductive material of the power generation element 111 arranged on the lower exterior side and the metal layer 1151, the communication signal is conducted through the connection line 8, so that the short circuit in the upper exterior material 114 is performed. In addition, a short circuit in the lower outer member 115 can be detected, and a short circuit between the power generation element 114 and the metal layers 1141 and 1151 covering the power generation element 114 can be detected.

  The upper exterior member 114 in this example corresponds to the first exterior member of the invention, and the lower exterior member 115 corresponds to the second exterior member of the invention. The upper exterior member 114 and the lower exterior member 115 are not necessarily configured separately, and may be integrated. Further, the electrical connection place between the metal layer 1141 and the metal layer 1151 does not need to be provided over the long side of the end portion of the layered battery 11 shown in FIG. Further, the connection location may be provided at the end of the layered battery 11 on the short side.

DESCRIPTION OF SYMBOLS 1 ... Assembled battery 11 ... Battery 111 ... Power generation element 112, 113 ... Electrode tab 114, 115 ... Exterior member 116 ... Joint part 117 ... Seal member 118 ... Notch part 2 ... Power supply line 3 ... Inverter 4 ... Motor 5 ... Battery Monitoring device 6 ... Voltage detection circuit 61 ... Microprocessor unit 62, 63 ... Coupling capacitor 65 ... Band pass filter 651, 652 ... Resistance 653 ... Capacitor 654 ... Rectifier diode 66 ... Capacitance adjustment resistor 67 ... Memory 68 ... Wiring 69 ... Communication wiring 611, 612 ... Wiring 641, 642 ... Resistance 643 ... Capacitor 7 ... Control circuit 71 ... Microprocessor unit 72, 74 ... Wiring 73 ... Coupling capacitor 8 ... Connection line 9 ... Abnormal signal transmission means

Claims (8)

A battery in which a power generation element is sealed by an exterior member including a metal layer and an insulating layer;
A detection unit for detecting the state of the battery;
A control unit for receiving a detection result detected by the detection unit;
A communication line that electrically connects the battery, the detection unit, and the control unit;
The insulating layer insulates the power generating element and the metal layer;
The detection unit transmits the state of the battery as a communication signal to the control unit via the communication line,
The battery monitoring apparatus, wherein the metal layer and the communication line are electrically connected by a connection line. A coupling capacitor is connected between the communication lines,
The battery monitoring apparatus according to claim 1, wherein one end of the connection line is connected to the communication line between the coupling capacitor and the detection unit. The metal layer and the insulating layer are layered,
Sandwiching the metal layer between a plurality of the insulating layers;
The battery monitoring device according to claim 1, wherein the other end of the connection line is connected to the metal layer. The battery monitoring device according to any one of claims 1 to 3, wherein the control unit or the detection unit detects a gain change of the communication signal caused by the communication signal passing through the communication line and the connection line. The battery monitoring apparatus according to any one of claims 1 to 4, further comprising an abnormality signal transmission unit that transmits an abnormality signal of a battery based on a change in gain of the communication signal. The battery monitoring device according to any one of claims 1 to 5, wherein a band-pass filter is provided on the communication line. A connection point between the connection line and the metal layer is provided at an end of the battery,
The battery monitoring device according to claim 1, wherein an end portion of the battery including the connection point is covered with a seal member. The exterior member has a first exterior member and a second exterior member,
The metal layer of the first exterior member and the metal layer of the second floor exterior member are electrically connected,
The battery monitoring device according to claim 1, wherein the other end of the connection line is electrically connected to a metal layer of the first exterior member or a metal layer of the second exterior member.

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