JP5931567B2 - Battery module - Google Patents

Description

  Embodiments described herein relate generally to an assembled battery module.

  2. Description of the Related Art Conventionally, in an electric vehicle, an assembled battery device is mounted as a driving power source. Here, as one aspect of the assembled battery device, an assembled battery module including an assembled battery having a plurality of secondary battery cells connected in series and an assembled battery monitoring circuit (VTM: Voltage Temperature Monitoring) for monitoring the assembled battery Are used, and all the secondary battery cells of these assembled battery modules are connected in series, and a battery management device (BMU: Battery Management Unit) for managing each assembled battery module is provided. A pack voltage and a pack current that are voltages of power that can be supplied by the battery pack, a cell voltage that is a voltage for each secondary battery cell of the assembled battery module, and the like are managed. In this case, the battery management device is configured as a so-called computer, and the voltage is significantly different from that of the power system handled by the entire assembled battery module. Therefore, communication between each other is performed via an electrically isolated communication path. It is common to use isolated communication.

JP 2011-78249 A

  However, in the prior art, even when the BMU is stopped, the power of the assembled battery is supplied as drive power to the insulated communication unit, and the assembled battery power is always consumed in the insulated communication unit. There is a problem of becoming. In particular, when an assembled battery module is daisy chained with another assembled battery module, only the power consumption of the assembled battery module including the insulation communication unit increases, and the balance with the power consumption of the other assembled battery modules is balanced. There is a problem that it collapses. Furthermore, there is also a problem that, when performing a process of maintaining a balance of power consumption between assembled battery modules connected in a daisy chain, the power required for the process increases.

The assembled battery device of the embodiment includes an assembled battery, a power supply unit, an insulated communication unit, a switch unit, a communication unit, and a buffer . The assembled battery has a plurality of battery cells connected in series. The power supply unit supplies power of the assembled battery as drive power. The insulated communication unit communicates with the battery management device via the electrically insulated communication path by the driving power supplied from the power supply unit. The switch unit supplies the driving power to the insulation communication unit when the operation command instructing the operation of the insulation communication unit is input from the battery management device, and the operation command is not input. And the supply of the drive power to the insulated communication unit is cut off. The communication unit communicates with the battery management device via the insulated communication unit using the driving power supplied from the power supply unit, and has an input terminal to which a reception signal received by the insulated communication unit from the battery management device is input. The buffer is connected between the insulated communication unit and the input terminal of the communication unit, and makes the input terminal of the communication unit high impedance when the supply of drive power to the insulated communication unit is interrupted.

FIG. 1 is a schematic diagram of a vehicle including a secondary battery device according to the present embodiment. FIG. 2 is a diagram illustrating functional blocks of the assembled battery monitoring circuit according to the present embodiment. FIG. 3 is a diagram illustrating an entire block of the battery management device according to the present embodiment. FIG. 4 is a diagram illustrating a configuration example of the interface circuit and the assembled battery module according to the present embodiment. FIG. 5 is a diagram for explaining the transmission signal and the logic level of the buffer that are input from the insulated communication IC to the power supply unit when the operation command is input and when the input of the operation command is stopped. FIG. 6 is a diagram for explaining a signal input from the power supply unit to the isolated communication IC and a logic level of the second buffer when the operation command is input and when the input of the operation command is stopped.

  Hereinafter, a secondary battery device having an assembled battery module according to the present embodiment and a vehicle including the secondary battery device will be described with reference to the drawings.

  FIG. 1 is a schematic diagram of a vehicle including a secondary battery device having an assembled battery module according to the present embodiment. In FIG. 1, the vehicle 100, the location where the secondary battery device is mounted on the vehicle 100, the drive motor of the vehicle 100, and the like are schematically illustrated.

  The secondary battery device is configured by connecting a plurality of assembled battery modules 101 (1) to 101 (4) in series. Here, the assembled battery modules 101 (1) to 101 (4) can be attached and detached independently, and can be exchanged with other assembled battery modules for maintenance or the like. The assembled battery module 101 (1) has an assembled battery 11. The assembled battery module 101 (2) has an assembled battery 12. The assembled battery module 101 (3) includes the assembled battery 13. In addition, the assembled battery module 101 (4) has an assembled battery 14. Here, the assembled battery 11 includes a plurality of secondary battery cells 11 (1) to 11 (x) [x: an integer equal to or greater than 2] connected in series (see FIG. 2). The assembled batteries 12 to 14 have the same configuration as the assembled battery 11. In the present embodiment, the secondary battery device has four assembled battery modules 101 (1) to 101 (4) connected in series, but is limited to this as long as a plurality of assembled battery modules are connected in series. Not what you want.

  One terminal of the connection line 31 is connected to the negative terminal of the assembled battery module 101 (1) connected to the low potential side among the plurality of assembled battery modules 101 (1) to 101 (4) included in the secondary battery device. It is connected. The connection line 31 is connected to the negative input terminal of the inverter 40.

  In addition, one of the connection lines 32 is connected to the positive terminal of the assembled battery module 101 (4) connected to the high potential side among the plurality of assembled battery modules 101 (1) to 101 (4) included in the secondary battery device. The terminals are connected via the switch device 33. The other terminal of the connection line 32 is connected to the positive input terminal of the inverter 40.

  The switch device 33 is connected in series to the plurality of assembled battery modules 101 (1) to 101 (4), and turns on or off the electrical connection of the plurality of assembled battery modules 101 (1) to 101 (4). That is, when the switch device 33 is turned on, a current flows between the assembled batteries 11 to 14. In the present embodiment, the switch device 33 is turned on when the power of the secondary battery cells included in the assembled batteries 11 to 14 of the assembled battery modules 101 (1) to 101 (4) is supplied to the load (see FIG. 3) and a precharge SWP (see FIG. 3) for preventing an inrush current flowing into the load. More specifically, when the load on the vehicle 2 side (for example, the motor 45) and the assembled battery modules 101 (1) to 101 (4) are electrically connected to the switch device 33, the precharge switch SWP is turned on. The main switch SWM is turned on after the potential difference from the load becomes small. This prevents welding of the main switch SWM due to inrush current. The precharge switch SWP and the main switch SWM are configured as relay circuits.

  The inverter 40 converts the applied DC voltage into a three-phase alternating current (AC) voltage for driving the motor. The inverter 40 is controlled for conversion to an AC voltage based on a control signal from a battery management unit (BMU: Battery Management Unit) 60 described later or an electric control device 71 for controlling the overall operation of the vehicle 100. . The three-phase output terminals of the inverter 40 are connected to the three-phase input terminals of the motor 45. The driving force (rotation) of the motor 45 is transmitted to the drive wheels WR and WL via, for example, a differential gear unit.

  An independent external power supply 70 is connected to the battery management device 60. The external power source 70 is, for example, a 12V rated lead-acid battery that supplies power to the on-vehicle accessory. The battery management device 60 is also connected to an electric control device 71 that manages the entire vehicle in response to an operation input from a driver or the like.

  FIG. 2 is a diagram showing functional blocks of an assembled battery monitoring circuit (VTM: Voltage Temperature Monitoring) according to the present embodiment. As shown in FIGS. 1 and 2, the assembled battery module 101 (1) includes an assembled battery 11 and an assembled battery monitoring circuit (VTM) 21. The assembled battery module 101 (2) includes the assembled battery 12 and an assembled battery monitoring circuit 22. The assembled battery module 101 (3) includes the assembled battery 13 and an assembled battery monitoring circuit 23. The assembled battery module 101 (4) includes the assembled battery 14 and an assembled battery monitoring circuit 24. In the following description, the functional blocks of the assembled battery module 101 (1) will be mainly described, but the functional blocks of the assembled battery modules 101 (2) to 101 (4) have the same configuration.

  The assembled battery monitoring circuit 21 includes a first communication unit 211 connected to the battery management device 60 via the connector 51, and a second communication unit 212 connected to the first communication unit 211 of the assembled battery monitoring circuit 22. Have. The assembled battery monitoring circuit 22 is connected to the battery management device 60 via the connector 51 and connected to the second communication unit 212 of the assembled battery monitoring circuit 21, and the assembled battery monitoring circuit 23. And a second communication unit 212 connected to the first communication unit 211. The assembled battery monitoring circuit 23 is connected to the battery management device 60 via the connector 51 and connected to the second communication unit 212 of the assembled battery monitoring circuit 22, and the assembled battery monitoring circuit 24. And a second communication unit 212 connected to the first communication unit 211. The assembled battery monitoring circuit 24 includes a first communication unit 211 connected to the battery management device 60 via the connector 51 and connected to the second communication unit 212 of the assembled battery monitoring circuit 23, and the assembled battery monitoring circuit 24. And the second communication unit 212 connected to the assembled battery monitoring circuit when there is an assembled battery monitoring circuit connected to the high potential side.

  In addition, the 1st communication part 211 and the 2nd communication part 212 between the assembled battery monitoring circuits 21 and 22 are connected, and the 1st communication part 211 and the 2nd communication part 212 between the assembled battery monitoring circuits 23 and 24 are connected. By connecting, the first communication unit 211 of the assembled battery monitoring circuits 21 and 23 may be connected to the battery management device 60 via the connector 51. In this case, the assembled battery monitoring circuits 21 and 22 are connected to each other via the first communication unit 211 and the second communication unit 212, and bidirectional communication is possible, and the assembled battery monitoring circuits 23 and 24 are also first to each other. Two-way communication is possible by being connected via the communication unit 211 and the second communication unit 212.

  More specifically, when connecting the assembled battery monitoring circuits 21 and 22, the information input / output terminal of the first communication unit 211 of the assembled battery monitoring circuit 21 is connected to the battery management device 60 via the connector 51. The information input / output terminal of the second communication unit 212 of the assembled battery monitoring circuit 21 is connected to the information input / output terminal of the first communication unit 211 of the assembled battery monitoring circuit 22.

  When connecting the assembled battery monitoring circuits 23 and 24, the information input / output terminal of the first communication unit 211 of the assembled battery monitoring circuit 23 is connected to the battery management device 60 via the connector 51. The information input / output terminal of the second communication unit 212 of the assembled battery monitoring circuit 23 is connected to the information input / output terminal of the first communication unit 211 of the assembled battery monitoring circuit 24.

  The assembled battery monitoring circuit 21 includes a voltage detection unit 213, a temperature detection unit 214, an equalization processing unit 215, and a diagnostic circuit 216.

  The equalization process part 215 performs the equalization process which equalizes the voltage of the secondary battery cell 11 (1) -11 (x) which the assembled battery 11 has. In the secondary battery device, it is known that the voltage between the combined secondary battery cells becomes non-uniform due to charge / discharge of the secondary battery cells, temperature variation, and the like. When the voltage between the secondary battery cells becomes non-uniform, it becomes impossible to perform efficient charge and discharge so that the function as the secondary battery device can be maximized.

  If charging is performed in the presence of a secondary battery cell with a high voltage without performing equalization, the secondary battery cell with a high voltage is quickly fully charged while the secondary battery cell with a low voltage is not fully charged. Thus, the entire charging may be completed. Therefore, when performing charging, the equalization processing unit 215 needs to equalize the voltage between the secondary battery cells.

  The diagnosis circuit 216 is a signal for notifying the abnormality of the assembled battery module 101 (1), and outputs a pulsation signal (rectangular wave signal) that switches to a high level or a low level at a preset basic frequency.

  The voltage detection part 213 detects the voltage (henceforth cell voltage) for every secondary battery cell of the secondary battery cells 11 (1) -11 (x) which the assembled battery 11 has. In other words, the voltage detection unit 213 detects the voltage between the terminals of the secondary battery cells 11 (1) to 11 (x) of the assembled battery 11 as the cell voltage. And the voltage detection part 213 inputs the voltage signal showing all the detected cell voltages into the battery management apparatus 60 via the 1st communication part 211 and the interface circuit 604 (refer FIG. 3).

  The temperature detection unit 214 detects the temperature of each secondary battery cell of the secondary battery cells 11 (1) to 11 (x) included in the assembled battery 11 or in the vicinity of the plurality of secondary battery cells. And the temperature detection part 214 inputs the temperature signal showing the detected temperature into the battery management apparatus 60 via the 1st communication part 211 and the interface circuit 604 (refer FIG. 3).

  FIG. 3 is a diagram illustrating an entire block of the battery management device according to the present embodiment. As shown in FIG. 3, the battery management device 60 includes a current detection circuit 602, an interface circuit 604 connected to the first communication unit 211 of the assembled battery monitoring circuits 21 to 24 via the connector 51, and an assembled battery monitoring circuit. Alerts that receive pulsation signals input from the diagnostic circuits 216 of 21 to 24 and an alert signal transmitted from the control circuit CTR and that indicate an abnormality in the assembled battery modules 101 (1) to 101 (4) and the battery management device 60 An alert signal processor 605 that outputs a signal, a power supply management unit 606 that is supplied with power of a power supply voltage from an external power supply 70, a switch drive circuit 608, a memory 607, and a control circuit that controls the operation of the secondary battery device (MPU: Micro Processing Unit) CTR.

  The memory 607 is, for example, an EEPROM (Electronically Erasable and Programmable Read Only Memory). The memory 607 stores a program that defines the operation of the control circuit CTR.

  A voltage signal input from the voltage detector 213, a temperature signal input from the temperature detector 214, and a pulsation signal input from the diagnostic circuit 216 are input to the interface circuit 604 from the assembled battery monitoring circuits 21 to 24. Is supplied through. Various signals (for example, logic signals) transmitted from the control circuit CTR are input via the connector 51 from the interface circuit 604 to the assembled battery monitoring circuits 21 to 24.

  The interface circuit 604 supplies the voltage signal input from the voltage detection unit 213, the temperature signal input from the temperature detection unit 213, etc. to the control circuit CTR by bidirectional serial communication, and the pulsation signal input from the diagnostic circuit 216. Is supplied to the alert signal processor 605.

  The alert signal processor 605 determines whether the pulsation signal supplied from the interface circuit 604 and the alert signal supplied from the control circuit CTR are normal or abnormal. When the pulsation signal or the alert signal supplied from the control circuit CTR is normal, the alert signal processor 605 outputs an alert signal that switches to a high level or a low level at a preset frequency. When the pulsation signal or the alert signal supplied from the control circuit CTR remains switched to the high level, the alert signal processor 605 outputs, for example, a normal low level alert signal as a high level alert signal.

  The alert signal output from the alert signal processor 605 is supplied to the electrical control device 71 connected via the control circuit CTR, the switch drive circuit 608, and the connector CN2.

  The switch drive circuit 608 outputs a signal S1 for controlling the operation of the precharge switch SWP of the switch device 33 and a signal S2 for controlling the operation of the main switch SWM under the control of the control circuit CTR.

  The signals S1 and S2 are supplied to the switch device 33 (see FIG. 1) via the connector CN1. The precharge switch SWP and the main switch SWM are relay circuits that are turned on or off by signals S1 and S2.

  For example, when the pulsation signal is abnormal, the control circuit CTR determines that the corresponding assembled battery monitoring circuit is abnormal based on the supplied alert signal, and controls the switch drive circuit 608 to control the precharge switch SWP. Then, the main switch SWM is turned off.

  The power supply management unit 606 supplies power to the current detection circuit 602, the alert signal processor 605, the memory 607, and the control circuit CTR. The power supply management unit 606 includes a switching circuit 606S that turns on or off the supply of power to the control circuit CTR, a timer TM that outputs to the switching circuit 606S a wake-up signal that instructs the switching circuit 606S to start, It has.

  A 12V power supply voltage applied by the external power supply 70 is converted into a 5V DC voltage by the DC / DC conversion circuit CA disposed in the preceding stage of the timer TM and applied to the timer TM. The timer TM is driven by the applied DC voltage of 5 V and outputs a wakeup signal to the switching circuit 606S. The switching circuit 606S is supplied with a start signal STA, an external charger signal CHG, a switching control signal from the control circuit CTR, a wake-up signal from the timer TM, and power from the external power source 70.

  Note that the wake-up signal from the timer TM is a signal that becomes a high level every set time. The timing at which the wakeup signal becomes high level is set by the control circuit CTR.

  By the way, a start button (not shown) for instructing driving of the power supply voltage, the start signal STA, and the external charger signal CHG to the external power supply 70 and the motor 45 is pressed through the connector CN1. Is supplied from a start detection unit (not shown) for detecting this and an external charger (not shown). In addition, the battery management device 60 transmits and receives signals to and from the electric control device 71 via the connector CN2.

  The start signal STA becomes high when a start detection unit (not shown) detects that a start button (not shown) is pressed, and when it is detected that the start button (not shown) is pressed again. This is a low level signal. The external charger signal CHG is a signal that becomes a high level when the external charger is connected to the secondary battery device and becomes a low level when the connection is released. The wakeup signal, start signal STA, and external charger signal CHG are also supplied to the control circuit CTR.

  When the secondary battery device is mounted on a device other than the vehicle, the start signal STA is at a high level when a power-on operation is performed on the device on which the secondary battery device is mounted. When is performed, the signal becomes a low level.

  When at least one of the start signal STA, the external charger signal CHG, and the wake-up signal becomes high level, the switching circuit 606S causes the power supply voltage applied from the external power supply 70 to be 5V by the internal DC / DC conversion circuit. Is applied to the alert signal processor 605 and the control circuit CTR.

  Further, when at least one of the start signal STA, the external charger signal CHG, and the wake-up signal becomes high level, the switching circuit 606S converts the power supply voltage supplied from the external power supply 70 into an internal DC / DC conversion circuit. Is converted into a DC voltage of a predetermined magnitude and applied to the current detection circuit 602.

  A wakeup signal is supplied from the timer TM to the control circuit CTR, and a start signal STA and an external charger signal CHG are supplied via the connector CN1. Therefore, when a DC voltage of 5 V is applied by the switching circuit 606S, the control circuit CTR detects which signal has become high level by detecting which signal has become high level. Thus, it can be confirmed whether the switching circuit 606S is turned on. If it can be confirmed by which signal the power is supplied, the control circuit CTR turns on the switching control signal and maintains the state in which the power is supplied from the switching circuit 606S.

  Further, the control circuit CTR monitors the wake-up signal, the start signal STA, and the external charger signal CHG. When all the signals become low level, the switching control signal is set to low level and the switching circuit 606S is turned off. Accordingly, the supply of power to the control circuit CTR, the alert signal processor 605, and the current detection circuit 602 is stopped.

  The control circuit CTR includes an energy deviation calculation unit 601 and a discharge time conversion unit 603. The energy deviation calculation unit 601 captures the voltage signal input from the voltage detection unit 213 via the first communication unit 211 and the interface circuit 604, and captures the current signal input from the current detection circuit 602.

  The discharge time conversion unit 603 calculates the difference in capacity between the secondary battery cells from the arrival time until the cell voltage represented by the captured voltage signal reaches a predetermined specific voltage and the current value represented by the captured current signal. And the discharge time of each secondary battery cell for making the remaining capacity of the secondary battery cell the same (that is, for equalization processing by the equalization processing unit 215) from the calculated capacity difference and arrival time Is calculated.

  Further, the control circuit CTR supplies a signal for controlling the operation to the assembled battery monitoring circuits 21 to 24 to the interface circuit 604. Specifically, when any of the wake-up signal, the start signal STA, and the external charger signal CHG is at a high level, the control circuit CTR puts an insulation communication IC 604a (see FIG. 4) described later into an operating state. An operation command instructing to do so is input to the interface circuit 604.

  On the other hand, the control circuit CTR stops the input of the operation command to the interface circuit 604 when all signals of the wake-up signal, the start signal STA, and the external charger signal CHG become low level.

  In the present embodiment, the control circuit CTR inputs the operation signal switched to the high level to the interface circuit 604 when any of the wakeup signal, the start signal STA, and the external charger signal CHG is at the high level. As a result, an operation command is input to the interface circuit 604.

  On the other hand, when all signals of the wake-up signal, the start signal STA, and the external charger signal CHG are at a low level, the control circuit CTR inputs an operation signal switched to a low level to the interface circuit 604. The input of the operation command to the circuit 604 is stopped.

  FIG. 4 is a diagram illustrating a configuration example of the interface circuit and the assembled battery module according to the present embodiment. 4 shows the assembled battery module 101 (1) and the interface circuit 604 connected via the connector 51, the assembled battery modules 101 (2) to 101 (101) connected via the connector 51 are shown. 4) and the interface circuit 604 have the same configuration.

  First, the configuration of the interface circuit 604 will be described. As shown in FIG. 4, the interface circuit 604 includes an insulation communication IC 604a, a second switch unit 604b, an inverter 604c, and a resistor 604d. The insulated communication IC 604a is an insulated communication unit that communicates with the battery management device 60 via an electrically insulated communication path by drive power supplied from a power supply unit 401 described later. In the present embodiment, the isolated communication IC 604a transmits a signal (for example, a voltage signal, a temperature signal, a pulsation signal, a logic signal, etc.) to or from the battery management device 60 via an electrically isolated communication path. Receive.

  More specifically, in this embodiment, the insulated communication IC 604a is configured by a transformer circuit or the like, and a transmission signal (for example, a voltage signal, a temperature signal, a pulsation signal, etc.) is input from the assembled battery module 101 (1). When the current flows through the coil of the transformer circuit, a transmission signal is transmitted to the battery management device 60.

  In addition, when a reception signal (for example, a logic signal) is input from the battery management device 60, the insulated communication IC 604a receives the reception signal from the battery management device 60 by causing a current to flow through a coil included in the transformer circuit.

  In this embodiment, the isolated communication IC 604a uses a transformer circuit to transmit a transmission signal and receive a reception signal. However, the transmission signal is transmitted via an electrically isolated communication path. The present invention is not limited to this as long as it can transmit and receive received signals. For example, the insulated communication IC 604a may communicate with the battery management device 60 via an electrically insulated communication path by using an element that transmits a signal by light, such as a photocoupler.

  The insulated communication IC 604a has an output terminal T4 and an input terminal T5. The output terminal T4 outputs a reception signal received from the battery management device 60. In this embodiment, the insulated communication IC 604a and a power supply unit 401 described later are connected to the output terminal T4, and the received signal received by the isolated communication IC 604a through communication with the battery management device 60 is transmitted to the power supply unit 401 described later. A first signal line 402 is connected.

  A transmission signal output from an output terminal T3, which will be described later, is input to the input terminal T5. In the present embodiment, a power supply unit 401 (described later) and an insulated communication IC 604a are connected to the input terminal T5, and a transmission signal transmitted by communication with the battery management device 60 is transmitted from the power supply unit 401 (described later) to the isolated communication IC 604a. The second signal line 403 is connected.

  The inverter 604c inverts the logic of the operation signal input from the control circuit CTR. The resistor 604d is connected in series to the second switch unit 604d and limits the current flowing through the second switch unit 604d.

  The second switch unit 604b is composed of a photocoupler or the like, and when the operation signal input from the control circuit CTR becomes high level (that is, when an operation command is input), When the light emitting element 604e emits light, a gate terminal of a switch unit 405, which will be described later, and a power supply terminal T1 of the power supply unit 401 are electrically connected to each other and an application unit such as a phototransistor that applies the battery voltage VDDS to the gate terminal 604f.

  In this embodiment, when the operation signal whose logic is inverted by the inverter 604c is at a low level (that is, when an operation command is input from the control circuit CTR), the light emitting element 604e has the potential on the inverter 604c side of the power supply D. It becomes lower and emits light when current from the power source D flows. When the light emitting element 604e emits light, the application unit 604f makes the power supply terminal T1 of the power supply unit 401 and the ground conductive. Accordingly, the application unit 604f applies the battery voltage VDDS applied from the power supply terminal T1 of the power supply unit 401 to the gate terminal of the switch unit 405.

  On the other hand, the light emitting element 604e has a potential on the inverter 604c side from the power source D when the operation signal whose logic is inverted by the inverter 604c is at a high level (that is, when an operation command is no longer input from the control circuit CTR). It becomes higher, current from the power source D stops flowing, and light emission stops. When the light emission of the light emitting element 604e stops, the application unit 604f interrupts conduction between the power supply unit 401, the power supply terminal T1, and the ground. Thereby, the application unit 604f stops the application of the battery voltage VDDS from the power supply terminal T1 of the power supply unit 401 to the gate terminal of the switch unit 405.

  Next, the configuration of the assembled battery module 101 (1) will be described. As shown in FIG. 4, the assembled battery module 101 (1) includes secondary battery cells 11 (x) connected to the high potential side among the secondary battery cells 11 (1) to 11 (x) included in the assembled battery 11. ) And the negative electrode terminal of the secondary battery cell (1) connected to the low potential side among the secondary battery cells 11 (1) to 11 (x) of the assembled battery 11 and the assembled battery. 11 includes a power supply unit 401 that supplies 11 power as drive power.

  In the present embodiment, the power supply unit 401 supplies the electric power of the assembled battery 11 to the insulated communication IC 604a via the connector 51 as drive power. Furthermore, in the present embodiment, the power supply unit 401 also functions as a communication unit that communicates with the battery management device 60 via the insulated communication IC 604a using the power of the assembled battery 11 as drive power. The power supply unit 401 has an input terminal T2 to which a reception signal received by the isolated communication IC 604a from the battery management device 60 is input. Further, the power supply unit 401 includes an output terminal T3 that outputs a transmission signal to be transmitted to the battery management device 60 via the insulated communication IC 604a.

  In the present embodiment, the power supply unit 401 is configured by an AFE (Analog Front End) -IC (Integrated Circuit) or the like, and uses the power of the assembled battery 11 as driving power via the power supply terminal T1, and each part of the assembled battery monitoring circuit 21. And the drive power is supplied to the insulated communication IC 604a via the power supply terminal T1 and the connector 51. In the present embodiment, the power supply unit 401 is activated by the power of the assembled battery 11, and after activation, the above-described second communication unit 212, voltage detection unit 213, temperature detection unit 214, diagnostic circuit 216, equalization processing It functions as the unit 215 and the first communication unit 211.

  In the present embodiment, the power supply unit 401 converts an analog signal representing all detected cell voltages and an analog signal representing the detected temperature of the assembled battery 11 into a digital signal (voltage signal, temperature signal), The signal is output to the second signal line 403 as a transmission signal via the output terminal T3. Further, the power supply unit 401 outputs the pulsation signal to the second signal line 403 as a transmission signal via the output terminal T3. Furthermore, the power supply unit 401 receives a reception signal (for example, a logic signal) transmitted through the first signal line 402 via the input terminal T2. Thereby, the power supply part 401 communicates the signal which the insulated communication IC604a communicates with the battery management apparatus 60 between the insulated communication IC604a.

  When an operation command is input from the battery management device 60 (control circuit CTR), the switch unit 405 supplies drive power from the power supply unit 401 to the isolated communication IC 604a. When no operation command is input, the switch unit 405 supplies the isolated communication IC 604a. The supply of drive power from the power supply unit 401 is cut off. In the present embodiment, the switch unit 405 is configured by a P-type MOS transistor or the like, and a gate terminal to which the battery voltage VDDS is applied when an operation command is input, and a source terminal to which driving power from the power supply unit 401 is supplied. And a drain terminal that supplies drive power supplied to the source terminal to the insulated communication IC 604a when the battery voltage VDDS is applied to the gate terminal.

  When the operation command is input from the control circuit CTR and the battery voltage VDDS is applied to the gate terminal by the second switch unit 604b, the switch unit 405 supplies the power source unit 401 to the source terminal via the power supply element T1. The drive power thus supplied is supplied to the insulated communication IC 604a via the drain terminal. On the other hand, the switch unit 405 supplies driving power from the drain terminal to the isolated communication IC 604a when the operation command is no longer input from the control circuit CTR60 and the battery voltage VDDS is no longer applied to the gate terminal by the second switch unit 604b. Cut off.

  As a result, when the battery management device 60 transitions to a stopped state (in this embodiment, all signals of the wake-up signal, the start signal STA, and the external charger signal CHG are at low level, the alert signal processor 605 and the current detection When the supply of the power supply voltage to the circuit 602 is stopped), the power consumed in the insulated communication IC 604a can be reduced, so that the power consumption of the assembled battery 11 can be suppressed.

  In this embodiment, a P-type MOS transistor is used for the switch unit 405. However, the present invention is not limited to this, and an N-type MOS transistor may be used for the switch unit 405.

  The resistor 404 limits the current that flows through the gate terminal of the switch unit 405 when the operation signal is input from the battery management device 60. Further, the resistor 406 limits the current flowing through the input terminal T2 by the driving power supplied from the power supply unit 401 via the power supply terminal T1.

  The buffer 407 is connected between the insulation communication IC 604a and the input terminal T2, and when the supply of drive power to the insulation communication IC 604b is interrupted, the input terminal T2 is set to high impedance. In the present embodiment, the buffer 407 is connected to the first signal line 402. The buffer 407 is composed of a gate buffer or the like, and instructs that the supply of drive power from the power supply unit 401 to the isolated communication IC 604a is cut off and the input to the power supply unit 401 (that is, the input terminal T2) to be high impedance. When the logic level (low level) to be input is input to the gate terminal, the input terminal T2 is set to high impedance (Hi-Z).

  As a result, when the supply of drive power to the isolated communication IC 604a is interrupted, the input terminal T2 of the power supply unit 401 is set to high impedance, and communication between the power supply unit 401 and the isolated communication IC 604a is stopped. be able to.

The second buffer 408 is connected between the output terminal T3 of the power supply unit 401 and the input terminal T5 of the isolated communication IC 604a. When the supply of drive power from the power supply unit 401 to the isolated communication IC 604a is interrupted, the input terminal T5 is set to a signal level that prevents current from flowing into the insulated communication IC 604a. In the present embodiment, the second buffer 408 is configured by latch-up free or the like and is connected to the second signal line 402. The second buffer 408 is turned off when the supply of driving power from the power supply unit 401 to the insulated communication IC 604a is interrupted, and the input terminal T5 is set to a low level. In this embodiment, the isolated communication I from the power supply unit 401 is used.
When the supply of driving power to C604a is interrupted, the output terminal T3 of the power supply unit 401 goes to a high level, so that an input current is prevented from flowing from the output terminal T3 of the power supply unit 401 to the input terminal T5. When the terminal T5 is set to the low level, but the logic level is reversed, that is, when the supply of drive power from the power supply unit 401 to the insulated communication IC 604a is interrupted, the output terminal T3 of the power supply unit 401 is set to the low level. First, the input terminal T5 is set to the high level to prevent the current from flowing to the output terminal T3 side of the power supply unit 401.

  As a result, when the switch unit 405 interrupts the supply of drive power from the power supply unit 401 to the isolated communication IC 604a, even if the output terminal T3 of the power supply unit 401 is at a high level, the second signal line 403 is used. Thus, it is possible to prevent current from flowing into the insulated communication IC 604a, and thus it is possible to prevent power from being consumed in the insulated communication IC 604a.

  Next, referring to FIG. 5, when the operation command is input from the control circuit CTR and when the input of the operation command from the control circuit CTR is stopped, the insulation communication IC 604 a supplies the power supply unit 401 (AFE-IC). The input transmission signal and the logic level output from the buffer 407 (gate buffer) will be described. FIG. 5 is a diagram for explaining the received signal and the logic level of the buffer that are input from the insulated communication IC to the power supply unit when the operation command is input and when the input of the operation command is stopped.

  When an operation command is input from the control circuit CTR and driving power is supplied from the power supply unit 401 to the isolated communication IC 604a, the insulated communication IC 604a is powered on, and the isolated communication IC 604a transmits from the battery management device 60. Received received signal is received. A reception signal received by the isolated communication IC 604a is input to the buffer 407 via the output terminal T4. When the battery voltage VDDS of the driving power supplied from the power supply unit 401 to the isolated communication IC 604a is applied, it is instructed that the logic level of the gate terminal of the buffer 407 is high and not high impedance. Outputs the received signal received by the insulated communication IC 604a. The power supply unit 401 receives the reception signal output from the buffer 407 via the input terminal T2.

  On the other hand, when the input of the operation command from the control circuit CTR is stopped and the supply of drive power from the power supply unit 401 to the isolated communication IC 604a is interrupted, the battery voltage VDDS of the drive power is not applied to the buffer 407. The logical level of the buffer 407 becomes low level. In addition, when the supply of driving power from the power supply unit 401 to the isolated communication IC 604a is interrupted, the logic level of the gate terminal of the buffer 407 is instructed to be low level and set to high impedance. Outputs impedance (Hi-Z). Then, the power supply unit 401 recognizes that the input terminal T2 becomes high impedance and communication with the isolated communication IC 604a is in a stopped state.

  Next, referring to FIG. 6, when the operation command is input from the control circuit CTR and when the input of the operation command from the control circuit CTR is stopped, the isolated communication IC 604a is connected from the power supply unit 401 (AFE-IC). A transmission signal transmitted to the battery management device 60 through the communication and a logic level output from the second buffer 408 will be described. FIG. 6 is a diagram for explaining a transmission signal input from the power supply unit to the isolated communication IC and a logic level of the second buffer when the operation command is input and when the input of the operation command is stopped. .

  When an operation command is input from the control circuit CTR and driving power is supplied from the power supply unit 401 to the isolated communication IC 604a, the power supply unit 401 outputs a transmission signal via the output terminal T3. When drive power is supplied from the power supply unit 401 to the isolated communication IC 604a, the power supply of the second buffer 408 is turned on. When the power supply is turned on, the second buffer 408 outputs the transmission signal output from the power supply unit 401 to the isolated communication IC 604a. In addition, when drive power is supplied from the power supply unit 401 to the insulated communication IC 604a, the insulated communication IC 604a enters an operating state (that is, a power supply is turned on), and thus the insulated communication IC 604a is connected to the input terminal T5. The transmission signal output from the second buffer 408 is received via Furthermore, the insulated communication IC 604a transmits the received transmission signal to the battery management device 60.

  On the other hand, when the input of the operation command from the control circuit CTR is stopped and the supply of driving power from the power supply unit 401 to the isolated communication IC 604a is cut off, the logic level of the output terminal T4 of the power supply unit 401 is maintained at the high level. However, since the potential on the insulated communication IC 604a side decreases, a current flows from the output terminal T4 to the insulated communication IC 604a side. However, when the supply of drive power from the power supply unit 401 to the isolated communication IC 604a is interrupted, the power supply of the second buffer 408 is turned off. When the power supply of the second buffer 408 is turned off, the second buffer 408 prevents the current from flowing into the input terminal T5 of the insulated communication IC 604a and sets the input terminal T5 to the low level. As a result, the current flowing from the output terminal T4 of the power supply unit 401 toward the insulated communication IC 604a can be prevented from flowing into the input terminal T5, so that the supply of drive power from the power supply unit 401 to the insulated communication IC 604a is cut off. During this time, it is possible to prevent current from flowing from the power supply unit 401 to the isolated communication IC 604a and power consumption in the isolated communication IC 604a.

  As described above, according to the assembled battery module of the present embodiment, when the operation command for instructing the operation of the insulated communication IC 604a is not input, the switch that cuts off the supply of drive power from the power supply unit 401 to the insulated communication IC 604a. By providing the unit 405, it is possible to prevent power consumption in the insulated communication IC 604a when the battery management device 60 is in a stopped state, so that power consumption in the assembled battery module can be reduced.

  Although the embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment is included in the scope and gist of the invention, and is also included in the invention described in the claims and the equivalent scope thereof.

11-14 assembled battery 21-24 assembled battery monitoring circuit 51-54 connector 60 battery management device 101 (1) -101 (4) assembled battery module 401 power supply unit 405 switch unit 407 buffer 408 second buffer 604 interface circuit 604a insulation communication IC
604b 2nd switch part 604e Light emitting element 604f Application part T2, T5 input terminal T3 output terminal

Claims (4)

An assembled battery having a plurality of battery cells connected in series;
A power supply unit for supplying power of the assembled battery as drive power;
An insulated communication unit that communicates with the battery management device via an electrically insulated communication path by the driving power supplied from the power supply unit;
When an operation command instructing to put the insulated communication unit into an operating state is input from the battery management device, the drive power is supplied to the isolated communication unit, and when the operation command is not input, the isolated communication is performed. A switch unit for cutting off the supply of the driving power to the unit;
Communication that communicates with the battery management device via the insulation communication unit by the driving power supplied from the power supply unit, and that has an input terminal to which the insulation communication unit receives a reception signal received from the battery management device. And
A buffer connected between the insulated communication unit and the input terminal of the communication unit, and when the supply of the driving power to the insulated communication unit is interrupted, the buffer for setting the input terminal of the communication unit to high impedance;
An assembled battery module comprising: The communication unit has an output terminal that outputs a transmission signal to be transmitted to the battery management device via the insulated communication unit,
The insulated communication unit has the input terminal to which the transmission signal output from the output terminal is input,
The input terminal of the insulated communication unit is connected between the output terminal of the communication unit and the input terminal of the insulated communication unit, and when the supply of the driving power to the insulated communication unit is interrupted, the insulated communication A second buffer having a signal level for preventing current from flowing into the unit;
The assembled battery module according to claim 1 , comprising: The switch unit supplies a gate to which a voltage is applied when the operation command is input, a source to which the driving power is supplied from the power supply unit, and a source to which the voltage is applied to the gate. The assembled battery module of Claim 1 or 2 provided with the transistor which has a drain which supplies the said drive electric power performed to the said insulated communication part. A second switch unit comprising: a light emitting element that emits light when the operation command is input; and an application unit that, when the light emitting element emits light, electrically connects the gate and the power supply unit to apply a voltage to the gate. The assembled battery module according to claim 3 , comprising:

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