JP2012138213A - Battery pack module and vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack module and a vehicle capable of avoiding that a battery pack becomes in an over discharge state and of preventing deterioration in battery pack performance.SOLUTION: A battery pack module 12 has: a battery pack 14 including a plurality of secondary battery cells 14-1 to 14-5; a monitoring circuit 22 detecting each voltage of the plurality of secondary battery cells 14-1 to 14-5; a communication circuit 25 outputting the voltage detected by the monitoring circuit 22 to an upper circuit 11, and receiving a signal from the upper circuit 11 to output it to the monitoring circuit 22; a determination circuit 27 outputting a shutdown signal when any one output voltage of the plurality of secondary battery cells 14-1 to 14-5 or an output voltage of the battery pack is lower than a setting voltage and when a state where there is no communication from the upper circuit 11 continues for a predetermined time period; and a power supply circuit 21 outputting a power supply voltage to the monitoring circuit 22 and the communication circuit 25 using the battery pack 14 as a power source, and performing a shutdown process when receiving the shutdown signal from the determination circuit 27.

Description

  Embodiments described herein relate generally to an assembled battery module and a vehicle.

  A secondary battery device including an assembled battery in which a plurality of secondary battery cells are combined has a voltage and temperature of each secondary battery cell in order to avoid an abnormal state of the secondary battery cell such as overcharge and overdischarge. A monitoring circuit for constant monitoring is provided.

  In general, in a secondary battery device including an assembled battery that is used in combination with a plurality of secondary battery cells, the secondary battery cells are stored in the combined secondary battery cells due to charge / discharge of the secondary battery cells or temperature variations. It is known that the energy becomes non-uniform. For this reason, the secondary battery device includes an equalization circuit that equalizes energy by resistance discharging the secondary battery cell when the energy stored in the secondary battery cell becomes non-uniform.

  The assembled battery monitoring circuit including a circuit directly connected to each secondary battery cell, such as the monitoring circuit and the equalization circuit, and the assembled battery management device that controls the assembled battery monitoring circuit have different ground potentials and are insulated from each other. Communication is performed via a communication circuit.

  The equalization circuit of the assembled battery monitoring circuit performs correction so that the energy of the secondary battery cells is equalized over several hours when the host device such as the assembled battery management device is not operating. For this reason, even when the battery pack monitoring device is turned off, the battery pack monitoring circuit obtains power from the battery pack and operates only with the battery pack monitoring circuit to perform energy equalization. The power supply to the battery monitoring circuit can be maintained.

JP 2008-193757 A

  For example, if the battery pack monitoring circuit continues to be turned on even after the end of energy equalization due to some kind of trouble, there is no communication command from the battery pack management device, so that the battery pack monitoring circuit supplies power as during normal operation. Although not consumed, it consumes more power than when the battery pack monitoring circuit is turned off.

  If the assembled battery monitoring circuit is kept powered on, the assembled battery monitoring circuit continues to operate until normal operation cannot be maintained due to the assembled battery output voltage. When the assembled battery is discharged to a voltage at which the assembled battery monitoring circuit does not operate normally, the assembled battery is overdischarged, and the performance may be deteriorated depending on the type of the secondary battery cell.

  The present invention has been made in view of the above circumstances, and provides an assembled battery module that prevents an assembled battery from being overdischarged and prevents performance of the assembled battery from deteriorating, and a vehicle. For the purpose.

  An assembled battery module according to an embodiment includes an assembled battery including a plurality of secondary battery cells, a monitoring circuit that detects voltages of the plurality of secondary battery cells, and outputs a voltage detected by the monitoring circuit to an upper circuit. In addition, a communication circuit that receives a signal from the upper circuit and outputs the signal to the monitoring circuit, and any of the voltages of the plurality of secondary battery cells is smaller than the set voltage for the single battery or the output voltage of the assembled battery is A determination circuit that outputs a shutdown signal when a voltage lower than a set voltage for the assembled battery and no communication from the upper circuit continues for a predetermined time; and a power supply to the monitoring circuit and the communication circuit using the assembled battery as a power source A power supply circuit that outputs a voltage and performs a shutdown process when the shutdown signal is received from the determination circuit.

It is a figure which shows the example of 1 structure of the secondary battery apparatus containing the assembled battery module which concerns on embodiment. It is a figure which shows the example of 1 structure of the assembled battery module which concerns on embodiment. It is a state transition diagram for demonstrating an example of operation | movement of the shutdown determination circuit of the assembled battery module which concerns on 1st Embodiment. 1 is a diagram schematically illustrating a configuration example of a vehicle according to an embodiment. It is a state transition diagram for demonstrating an example of operation | movement of the shutdown determination circuit of the assembled battery module which concerns on 2nd Embodiment.

Hereinafter, the assembled battery module and the vehicle according to the first embodiment will be described with reference to the drawings.
In FIG. 1, the example of 1 structure of the secondary battery apparatus 1 containing the assembled battery module which concerns on this embodiment is shown. The secondary battery device 1 controls input / output of electric power of the assembled battery modules 12a to 12c using information on the assembled battery modules 12a to 12c and the assembled batteries 14a to 14c received from the assembled battery modules 12a to 12c. A battery management unit (BMU: Battery Management Unit) 11. The assembled battery modules 12a to 12c include assembled batteries 14a to 14c including a plurality of secondary battery cells, and assembled battery monitoring circuits (VTM: Voltage Temperature Monitoring) 13a to 13c.

  The secondary battery device 1 is connected to a device using a secondary battery device such as an electric vehicle or a power storage system, and the assembled batteries 14a to 14c are charged and discharged through the positive terminal 16 and the negative terminal 17 and the remaining capacity. The communication relating to the maintenance of the secondary battery device 1 is performed between the assembled battery management device 11 and a device (such as an electric vehicle) in which the secondary battery device 1 is incorporated via the communication line 15.

  Moreover, the secondary battery apparatus 1 may have an electromagnetic contactor (not shown) for turning on and off the connection between the positive terminal 16 and the negative terminal 17 and the secondary battery apparatus using apparatus.

  The assembled battery management device 11 includes a communication interface IF that performs insulation communication with the assembled battery monitoring circuits 13a to 13c. The communication interface IF communicates information such as voltages and temperatures of the assembled batteries 14a to 14c with the assembled battery monitoring circuits 13a to 13c via the communication lines 19a to 19c, and relates to maintenance of the secondary battery device 1. Collect information. Moreover, the assembled battery management apparatus 11 transmits a power control signal from the communication interface IF to the power control signal lines 111a to 111c when the assembled battery modules 12a to 12c are mounted. The assembled battery management device 11 is supplied with power from the secondary battery device using device via the power supply line 18.

  The assembled batteries 14a to 14c of the assembled battery modules 12a to 12c are connected in series, and both ends of the assembled batteries 14a to 14c connected in series are electrically connected to the positive terminal 16 and the negative terminal 17, respectively.

  In FIG. 1, one assembled battery 14 a includes five secondary battery cells 14 a-1 to 14 a-5, but is not limited to this number. Further, in FIG. 1, the three assembled battery modules 12 a to 12 c are provided. However, the number is not limited to this number, and may be any plural number or a single assembled battery module 12. .

  The assembled battery monitoring circuits 13a to 13c measure the voltages and temperatures of the individual secondary battery cells 14a-1 to 14c-5 constituting the assembled batteries 14a to 14c based on commands from the assembled battery management device 11 through communication. To do. However, the temperature to be measured may be several for each assembled battery 14a to 14c, and the temperatures of all the secondary battery cells 14a-1 to 14c-5 may not be detected.

  The assembled battery monitoring circuits 13a to 13c are connected in series by communication lines 19a to 19c and power control signal lines 111a to 111c. The assembled battery monitoring circuits 13a to 13c transfer data to each other via the communication lines 19b and 19c, and also transfer data between the communication interface IF of the assembled battery management apparatus 11 and the assembled battery monitoring circuit 13a at the end. By doing so, the data of the assembled battery monitoring circuits 13a to 13c are transferred to the assembled battery management device 11. Note that all or part of the elements constituting the assembled battery monitoring circuits 13a to 13c may be constituted by a semiconductor integrated circuit.

  Here, for example, in the case of the assembled battery 14 in which ten secondary battery cells 14-1 to 14-5 having an output of 3V are connected in series, there is a potential difference of 30V between the negative electrode and the positive electrode as the assembled battery. Therefore, when the assembled battery monitoring circuit 13 is configured to use the negative voltage of the assembled battery module 12 as a reference potential, it communicates with the other assembled battery monitoring circuit 13 connected to the positive electrode side having a potential difference of 30V. Must.

  Since the assembled battery modules 12a to 12c are connected to a power inverter or converter, noise current flows through the positive terminal 16 and the negative terminal 17 over a wide frequency range. As a result, due to the connection wiring impedance between the assembled battery modules 12a to 12c, a potential difference occurs between the positive electrode side of one assembled battery module 12 and the negative electrode side of the other assembled battery modules 12a to 12c, Common mode noise is generated between the assembled battery modules 12a to 12c. Moreover, since assembled battery module 12a-12c itself also has an impedance, the voltage between the negative electrode and positive electrode as assembled battery module 12a-12c changes depending on charging / discharging electric current. Therefore, the assembled battery monitoring circuits 13a to 13c of the present embodiment are configured to be communicable between the assembled battery modules 12a to 12c having different reference potentials.

  FIG. 2 is a diagram illustrating a configuration example of the assembled battery monitoring circuit 13a of the present embodiment. In the following description, “upper” represents the side closer to the positive electrode terminal 16, and “lower” represents the side closer to the negative electrode terminal 17.

  The assembled battery monitoring circuit 13a includes a power supply circuit 21a, a monitoring circuit 22a, a DC converter circuit 23a, a level shift circuit 24a, a lower communication circuit 25a, an upper communication circuit 26a, and a shutdown determination circuit 27a.

  The power supply circuit 21a is activated by a wake-up signal from the shutdown determination circuit 27a, and performs a shutdown process by the shutdown signal. The power supply circuit 21a outputs a voltage using the assembled battery 14a as a power supply and the negative potential of the assembled battery module 12a as a reference potential. The output voltage of the power supply circuit 21a is supplied to the monitoring circuit 22a, the DC converter circuit 23a, the level shift circuit 24a, and the lower communication circuit 25a.

  The DC converter circuit 23a generates a power supply with a shifted potential, which is necessary for communication with a communication partner operating with a different reference voltage. For example, since the DC converter circuit 23a is provided in the lower assembled battery monitoring circuit 13a, it generates a power supply voltage using the negative potential of the upper assembled battery module 12b as a reference potential. Specifically, a charge pump circuit is known as a method for realizing this circuit.

  The monitoring circuit 22a detects the state (voltage, temperature, etc.) of the secondary battery cells 14a-1 to 14a-5 constituting the assembled battery 14a, and from the lower communication circuit 25a via the communication line 19a. 11 is received, and the detection result is transmitted to the lower communication circuit 25a and the shutdown determination circuit 27a. The monitoring circuit 22a controls the switch 53a of the lower communication circuit 25a to prevent a collision between the communication from the upper communication circuit 26a and its own communication.

  The lower communication circuit 25a is provided with a switch 53a. The switch 53a is switched by a control signal from the monitoring circuit 22a. That is, the monitoring circuit 22 a transmits maintenance information such as voltages and temperatures of the secondary battery cells 14 a-1 to 14 a-5 collected by itself by switching the communication path to the assembled battery management device 11. On the other hand, at other timings, the communication path is returned to the original state so that the maintenance information from the upper monitoring circuit 22b can be communicated.

  The lower communication circuit 25a receives a signal from the assembled battery management device 11 (or a lower assembled battery monitoring circuit 13 (not shown)) and outputs the signal to the monitoring circuit 22a and the shutdown determination circuit 27a, and the level shift circuit 24a. To the upper communication circuit 26a. The lower communication circuit 25a receives a signal from the upper communication circuit 26a via the level shift circuit 24a and outputs the signal to the assembled battery management device 11 (or a lower assembled battery monitoring circuit 13 (not shown)).

  As the power source, the output potential of the power supply circuit 21a and the negative potential of the assembled battery 14a (or the positive potential of the lower assembled battery module (not shown)) are input as reference voltages to the lower communication circuit 25a.

  The level shift circuit 24a is disposed between the lower communication circuit 25a and the upper communication circuit 26a, and functions as an interface that enables transmission and reception of communication signals between different reference potentials. That is, the level shift circuit 24a sets the binary communication signal that sets the lower reference potential handled by the lower communication circuit 25a to the “0” level and the upper reference potential handled by the higher communication circuit 26a to the “0” level. The communication signal of value is converted into each other by shifting the potential level. The output signal of the lower communication circuit 25a is input to the level shift circuit 24a. Further, a power control signal line 111a is connected to the level shift circuit 24a, and a power control signal is received from the assembled battery management device 11 (or the lower assembled battery monitoring circuit 13) via the power control signal line 111a.

  The upper communication circuit 26a receives a signal and a power supply control signal from the lower communication circuit 25a via the level shift circuit 24a and outputs them to the upper assembled battery monitoring circuit 13b, and also outputs a signal from the upper assembled battery monitoring circuit 13b. It is received and output to the lower communication circuit 25a via the level shift circuit 24a. The upper communication circuit 26a is supplied with the output potential of the DC converter circuit 23a and the negative potential of the upper assembled battery module 12b (or the positive potential of the assembled battery 14a) as a power source.

  As described above, the output potential of the DC converter circuit 23a is (substantially) the same as the power supply potential corresponding to the upper reference potential, that is, the output potential of the power supply circuit 21b. Therefore, the upper communication circuit 26a and the lower communication circuit 25b operate under a power supply potential with no (small) potential difference.

  The upper communication circuit 26a and the lower communication circuit 25b perform communication with the positive electrode of the assembled battery module 12a and the negative electrode of the assembled battery module 12b connected to each other as a common reference potential. For this reason, only the potential difference resulting from the wiring impedance between the positive electrode of the assembled battery module 12a and the negative electrode of the assembled battery module 12b and the charge / discharge current of the battery occurs between the upper communication circuit 26a and the lower communication circuit 25b. For the communication line 19b, this is an in-phase potential difference, so that communication can be performed by removing the in-phase component by performing differential communication.

  The shutdown determination circuit 27a includes a power supply control signal from the power supply control signal line 111a, a communication signal from the communication line 19a to the assembled battery management device 11 (or the lower assembled battery monitoring circuit 13), and a secondary from the monitoring circuit 22a. The voltage (unit cell output voltage) of the battery cells 14a-1 to 14a-5 and the positive voltage (assembled battery output voltage) of the assembled battery 14a are input.

  The assembled battery management device 11 sets the power control signal to the off level (second level) when starting the assembled battery modules 12a to 12c. The power control signal is transmitted through the power control signal lines 111a to 111c in the order of the assembled battery module 12a, the assembled battery module 12b, and the assembled battery module 12c. The assembled battery management device 11 sets the power supply control signal to the on level (first level) when shutting down the assembled battery modules 12a to 12c. The power supply control signal is turned on when the assembled battery modules 12 a to 12 c are removed from the secondary battery device 1.

  The assembled battery monitoring circuits 13a to 13c are equalized circuits 28a for equalizing by discharging the non-uniformity of energy stored in the secondary battery cells 14a-1 to 14c-5 of the assembled batteries 14a to 14c. To 28c.

  The equalization circuits 28a to 28c slowly equalize energy over several hours when the battery pack management device 11 and the device equipped with the secondary battery device 1 are not operating. For this reason, the assembled battery monitoring circuits 13a to 13c are configured to perform energy equalization using the assembled batteries 14a to 14c as a power source even when the assembled battery management device 11 is turned off. That is, the power supply circuits 21a to 21c are configured so that power supply to the assembled battery monitoring circuits 13a to 13c can be continued even when the assembled battery management device 11 is not operating. During the period when the assembled battery monitoring circuits 13a to 13c operate, the power control signal is maintained at the off level even when the assembled battery management device 11 is turned off.

  For example, if the assembled battery monitoring circuits 13a to 13c continue to be turned on even after the end of energy equalization due to some kind of trouble, there is no command from the assembled battery management device 11 so that it does not consume as much power as during normal operation. Compared to when the battery pack monitoring circuits 13a to 13c are turned off, a large amount of power is consumed. In this case, the assembled battery monitoring circuits 13a to 13c continue to operate until the output voltage of the assembled batteries 14a to 14c cannot maintain the normal operation of the assembled battery monitoring circuits 13a to 13c.

  When the voltage (circuit operating voltage) at which normal operation of the assembled battery monitoring circuits 13a to 13c cannot be maintained is designed to be lower than the lower limit voltage of the normal usage range of the assembled batteries 14a to 14c, the assembled battery monitoring circuit 13a If the battery is discharged to a circuit operating voltage of ˜13c, the assembled batteries 14a-14c may be in an overdischarged state. Furthermore, depending on the type of the assembled batteries 14a to 14c, the performance of the assembled batteries 14a to 14c may deteriorate due to the overdischarge state.

  In this embodiment, in order to avoid that the assembled battery 14a-14c will be in an overdischarged state by continuing operation | movement of the assembled battery monitoring circuits 13a-13c as mentioned above, in order to avoid the secondary battery cell 14a of the assembled batteries 14a-14c. The output voltage of -1 to 14c-5 or the output voltage of the assembled battery is lower than the set voltage (set voltage for single battery or set voltage for assembled battery) set by communication from the assembled battery management device 11, and When the state where there is no communication from the assembled battery management device 11 continues for a predetermined time, it is assumed that the assembled battery monitoring circuits 13a to 13c are not managed by the assembled battery management device 11, and the shutdown determination circuits 27a to 27c monitor the assembled battery. The circuits 13a to 13c themselves are turned off.

  FIG. 3 is a state transition diagram for explaining an example of the operation of the shutdown determination circuits 27a to 27c. The shutdown determination circuits 27a to 27c output wakeup signals or shutdown signals to the power supply circuits 21a to 21c based on the input signals. The operation of the shutdown determination circuit 27a will be described below with reference to FIG. 3, but the operation of the shutdown determination circuits 27b and 27c is the same.

  In a state where the power supply circuit 21a is shut down (shutdown state S1), the shutdown determination is made when the power supply control signal is turned off and the output voltage of the assembled battery 14a is equal to or higher than the circuit operating voltage of the assembled battery monitoring circuit 13a. The circuit 27a enters the wake-up state W1, and outputs a wake-up signal to the power supply circuit 21a. The power supply circuit 21a is activated when it receives the wake-up signal.

  In the wake-up state W1, the shutdown determination circuit 27a is in the shutdown state when the power supply control signal is turned on or when the output voltage of the assembled battery 14a becomes lower than the circuit operating voltage of the assembled battery monitoring circuit 13a. At S1, a shutdown signal is output to the power supply circuit 21a. When receiving the shutdown signal, the power supply circuit 21a performs a shutdown process.

  In the wake-up state W1, any of the voltages (single battery output voltages) of the secondary battery cells 14a-1 to 14a-5 is smaller than the set voltage for the single battery, or the output voltage of the assembled battery is set for the assembled battery. When the voltage becomes lower than the voltage, the shutdown determination circuit 27a enters the overdischarge warning state W2. Since the assembled battery 14a is not overdischarged in this state, the shutdown determination circuit 27a maintains transmission of the wake-up signal to the power supply circuit 21a.

  In the overdischarge warning state W2, all the voltages (single battery output voltages) of the secondary battery cells 14a-1 to 14a-5 are equal to or higher than the set voltage for the single battery, or the output voltage of the assembled battery is equal to or higher than the set voltage for the assembled battery. Then, the shutdown determination circuit 27a returns to the wake-up state W1 and maintains transmission of the wake-up signal to the power supply circuit 21a.

  In the overdischarge warning state W2, the shutdown determination circuit 27a shuts down when the power supply control signal is turned on or when the output voltage of the assembled battery 14a becomes lower than the circuit operating voltage of the assembled battery monitoring circuit 13a. State S1 is entered, and a shutdown signal is output to the power supply circuit 21a. When receiving the shutdown signal, the power supply circuit 21a performs a shutdown process.

  In the overdischarge warning state W2, when the communication signal from the assembled battery management device 11 is in the no-communication state for a predetermined time, the shutdown determination circuit 27a enters the overdischarge prevention state S2, and transmits a shutdown signal to the power supply circuit 21a. When receiving the shutdown signal, the power supply circuit 21a performs a shutdown process. That is, when any one of the output voltages of the plurality of secondary battery cells 14a-1 to 14a-5 is smaller than the set voltage for the single battery or when the output voltage of the assembled battery 14a is smaller than the set voltage for the assembled battery, And when the communication signal from the assembled battery management apparatus 11 is not received for a definite period of time, the shutdown determination circuit 27a will be in the overdischarge prevention state S2, and will output a shutdown signal even when the assembled battery 14a is not overdischarged.

  In the overdischarge prevention state S2, the shutdown determination circuit 27a shuts down when the power supply control signal is turned on or when the output voltage of the assembled battery 14a becomes lower than the circuit operating voltage of the assembled battery monitoring circuit 13a. The state S1 is entered and the output of the shutdown signal to the power supply circuit 21a is maintained.

  That is, in this embodiment, when the shutdown determination circuit 27a is provided with two shutdown states S1 and S2, when the output voltage of the secondary battery cell or the assembled battery becomes high for some reason in the shutdown state S2, The battery monitoring circuit 13a is prevented from starting up without permission. When the shutdown determination circuit 27a is in the shutdown state S2, the assembled battery monitoring circuit 13a cannot be activated unless the assembled battery management device 11 turns on the power control signal after turning it on.

  The set voltage values for single cells set by communication from the assembled battery management device 11 are overdischarge voltage values at which the secondary battery cells 14a-1 to 14c-5 constituting the assembled batteries 14a to 14c are overdischarged. By setting a higher value, only the self-discharge currents of the secondary battery cells 14a-1 to 14c-5 constituting the assembled batteries 14a to 14c are obtained after the assembled battery monitoring circuits 13a to 13c are turned off. Since it is consumed, the time until the assembled batteries 14a to 14c reach the overdischarged state can be greatly increased.

  Similarly, the set voltage value for the assembled battery set by communication from the assembled battery management device 11 is an overdischarge voltage at which the secondary battery cells 14a-1 to 14c-5 constituting the assembled batteries 14a to 14c are overdischarged. After the assembled battery monitoring circuits 13a to 13c are turned off by setting the value higher than the sum of the values (overdischarge voltage value of the secondary battery cells 14a-1 to 14c-5 × number of secondary battery cells) Since only the self-discharge currents of the assembled batteries 14a to 14c are consumed, the time until the assembled batteries 14a to 14c reach the overdischarge state can be significantly increased.

  When the assembled battery modules 12a to 12c are initialized, the assembled battery management device 11 communicates at least one of the set voltage value for single cells and the set voltage value for assembled batteries to the assembled battery modules 12a to 12c, and shuts down. A set voltage value for a single battery and a set voltage value for an assembled battery having predetermined sizes are set in the determination circuits 27a to 27c.

  On the other hand, since the shutdown determination circuits 27a to 27c monitor the presence / absence of communication from the assembled battery management device 11, the overdischarge voltages of the secondary battery cells 14a-1 to 14c-5 constituting the assembled batteries 14a to 14c are monitored. The set voltage value for the single battery is set to a value higher than the value, and the battery pack is set to a value higher than the sum of the overdischarge voltage values of the secondary battery cells 14a-1 to 14c-5 constituting the battery packs 14a to 14c. Even if the set voltage value is set, the output voltage of the secondary battery cells 14a-1 to 14c-5 and the output voltage of the assembled battery are smaller than the voltage set value while the assembled battery management device 11 is operating. As a result, the battery pack monitoring circuits 13a to 13c are not turned off.

  As described above, in the secondary battery device 1, the predetermined voltage before the output voltage of each of the secondary battery cells 14a-1 to 14c-5 constituting the assembled batteries 14a to 14c or the output voltage of the assembled battery is overdischarged. When the voltage (unit battery set voltage or assembled battery set voltage) is lower than the voltage (unit battery set voltage or the assembled battery set voltage), communication is not received from the assembled battery management device 11 for a certain period of time (for example, the assembled battery management device 11 is turned off) The battery pack monitoring circuits 13a to 13c can be turned off to increase the period until the battery packs 14a to 14c reach an overdischarged state. Accordingly, in the secondary battery device 1 including the assembled battery module according to the present embodiment, the assembled batteries 14a to 14c can be prevented from being overdischarged, and the performance of the assembled battery can be prevented from being deteriorated. it can.

  FIG. 4 schematically shows a configuration example of a vehicle including the secondary battery device 1. FIG. 4 schematically shows the vehicle 100, the location where the secondary battery device is mounted on the vehicle 100, the drive motor 45 of the vehicle 100, and the like.

  The vehicle 100 includes a secondary battery device 1, an electric control unit (ECU: Electric Control Unit) 80 that is a higher-level control means of the secondary battery device 1, an external power source 70, an inverter 40, and a drive motor 45. ing.

  The secondary battery device 1 connects a plurality of assembled battery modules 12a, 12b, and 12c, the assembled battery management device 11, the assembled battery modules 12a, 12b, and 12c, and the assembled battery management device 11 that are connected in series with each other. Power control signal lines 111a to 111c, communication lines 19a to 19c, and a switch device 33 are provided.

  The assembled battery module 12a includes an assembled battery 14a and an assembled battery monitoring circuit 13a. The assembled battery module 12b includes an assembled battery 14b and an assembled battery monitoring circuit 13b. The assembled battery module 12c includes an assembled battery 14c and an assembled battery monitoring circuit 13c. The assembled battery modules 12a, 12b, and 12c can be detached independently, and can be replaced with another assembled battery module.

  One terminal of the connection line L1 is connected to the negative electrode terminal 17 of the secondary battery device 1. The connection line L <b> 1 is connected to the negative input terminal of the inverter 40 through a current detection unit (not shown) in the assembled battery management device 11.

  One terminal of the connection line L <b> 2 is connected to the positive electrode terminal 16 of the secondary battery device 1 via the switch device 33. The other terminal of the connection line L2 is connected to the positive input terminal of the inverter 40.

  The switch device 33 includes a precharge switch (not shown) that is turned on when the battery is charged, and a main switch (not shown) that is turned on when the battery output is supplied to the load. The precharge switch and the main switch include a relay circuit (not shown) that is turned on and off by a signal supplied to a coil disposed in the vicinity of the switch element.

  The inverter 40 converts the input DC voltage into a three-phase alternating current (AC) high voltage for driving the motor. The output voltage of the inverter 40 is controlled based on a control signal from an assembled battery management device 11 described later or an electric control device 80 for controlling the entire vehicle operation. The three-phase output terminals of the inverter 40 are connected to the three-phase input terminals of the drive motor 45. The rotation of the drive motor 45 is transmitted to the drive wheels W through, for example, a differential gear unit.

  An independent external power supply 70 is connected to the assembled battery management device 11. The external power supply 70 is a lead storage battery with a rating of 12V. The assembled battery management device 11 is connected to an electric control device 80 that manages the entire vehicle in response to an operation input from a driver or the like.

  According to the assembled battery module and the vehicle according to the present embodiment, when the output voltage of the secondary battery cell is smaller than the set voltage for the single battery or the output voltage of the assembled battery is before the assembled battery is overdischarged. If the voltage is lower than the set voltage for the assembled battery and no communication is received from the assembled battery management device for a certain period of time (for example, the assembled battery management device is turned off), the voltage temperature monitoring circuit is turned off. The period until the assembled battery reaches the overdischarged state can be increased.

  That is, according to the present embodiment, it is possible to provide an assembled battery module and a vehicle that can prevent the assembled battery from being overdischarged and prevent the performance of the assembled battery from deteriorating.

  Next, an assembled battery module and a vehicle according to a second embodiment will be described with reference to the drawings. In the following description, the same reference numerals are given to the same configurations as those of the assembled battery module and the vehicle according to the first embodiment described above, and the description thereof is omitted. In the present embodiment, the operation of the shutdown determination circuit 27 (27a to 27c) of the assembled battery monitoring circuit 13 (13a to 13c) is different from that of the first embodiment.

  FIG. 5 shows a state transition diagram for explaining an example of the operation of the shutdown determination circuits 27a to 27c. The shutdown determination circuits 27a to 27c output wakeup signals or shutdown signals to the power supply circuits 21a to 21c based on the input signals.

  In the present embodiment, when the shutdown determination circuits 27a to 27c are in the overdischarge prevention state S2, all the unit cell output voltages are equal to or higher than the unit cell set voltage, or the assembled battery output voltage is equal to or higher than the group battery set voltage. In this case, the shutdown determination circuits 27a to 27c enter the wake-up state W1, and output a wake-up signal to the power supply circuits 21a to 21c. The power supply circuits 21a to 21c are activated when receiving the wake-up signal.

  The assembled battery module and the vehicle according to the present embodiment differ from the first embodiment described above only in the operation of the shutdown determination circuits 27a to 27c. In other words, in the present embodiment, the secondary battery cells 14a-1 to 14a-1 constituting the assembled batteries 14a-14c are provided by providing two shutdown states S1, S2 in the shutdown determination circuits 27a-27c as in the first embodiment. When the output voltage of 14c-5 or the output voltage of the assembled battery becomes smaller than a predetermined voltage (single cell set voltage or assembled battery set voltage) before the overdischarge state, communication is performed from the assembled battery management device 11 for a certain period of time. If not, the battery pack monitoring circuits 13a to 13c can be turned off to increase the period until the battery packs 14a to 14c reach an overdischarged state. As a result, it is possible to prevent the assembled batteries 14a to 14c from being overdischarged and to prevent the performance of the assembled battery from deteriorating.

  That is, according to the present embodiment, it is possible to provide an assembled battery module and a vehicle that can prevent the assembled battery from being overdischarged and prevent the performance of the assembled battery from deteriorating.

  Further, in the shutdown state S2, when all of the unit cell output voltages are equal to or higher than the unit cell set voltage, or when the battery pack output voltage is equal to or higher than the unit cell set voltage, the shutdown determination circuits 27a to 27c output. The power supply circuits 21a to 21c are activated by the wakeup signal. As a result, even in the shutdown state S2, all of the output voltages of the secondary battery cells 14a-1 to 14c-5 constituting each of the assembled batteries 14a to 14c are equal to or higher than the set voltage for the single battery for some reason. In the case, or when the output voltage of the assembled batteries 14a to 14c becomes equal to or higher than the set voltage for the assembled battery, the assembled battery monitoring circuits 13a to 13c start up and start communication with the assembled battery management device 11, etc. It becomes possible to take measures.

  In the first embodiment, the assembled battery monitoring circuits 13a to 13c are managed by the assembled battery management device 11, but in this embodiment, the assembled battery monitoring circuits 13a to 13c are managed by the assembled battery management device 11. In addition, the battery packs 14a to 14c can be managed by themselves. As described above, in the present embodiment, the management function in the assembled battery monitoring circuits 13a to 13c can be expanded as compared with the first embodiment described above.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  IF ... Communication interface, W1 ... Wake-up state, S1 ... Shutdown state, W2 ... Overdischarge warning state, S2 ... Overdischarge prevention state, W ... Drive wheel, 1 ... Secondary battery device, 11 ... Battery management device (higher level) Circuit), 12 (12a-12c) ... assembled battery module, 13 (13a-13c) ... assembled battery monitoring circuit, 14 (14a-14c) ... assembled battery, 14a-1-14c-5 ... secondary battery cell, 16 ... Positive terminal, 17 ... Negative terminal, 18 ... Power supply line, 19a to 19c ... Communication line, 21 (21a to 21c) ... Power supply circuit, 22 (22a to 22c) ... Monitoring circuit, 23 (23a to 23c) ... DC Converter circuit, 24 (24a to 24c) ... Level shift circuit, 25 (25a to 25c) ... Lower communication circuit, 26 (26a to 26c) ... Upper communication circuit, 27 (27a to 27c) ... Shutdown determination circuit, 40 ... inverter, 45 ... drive motor, 53 (53a-53c) ... switch, 70 ... external power supply, 80 ... electric control unit, 100 ... vehicle, 111 a to 111 c ... power control signal line.

Claims (6)

An assembled battery including a plurality of secondary battery cells;
A monitoring circuit for detecting voltages of the plurality of secondary battery cells;
A communication circuit that outputs a voltage detected by the monitoring circuit to an upper circuit, receives a signal from the upper circuit, and outputs the signal to the monitoring circuit;
Any of the voltages of the plurality of secondary battery cells is smaller than the set voltage for the single battery or the output voltage of the assembled battery is smaller than the set voltage for the assembled battery, and no communication from the upper circuit continues for a predetermined time A determination circuit that outputs a shutdown signal,
And a power supply circuit that outputs a power supply voltage to the monitoring circuit and the communication circuit using the assembled battery as a power supply, and performs a shutdown process when the shutdown signal is received from the determination circuit. Battery module. In the determination circuit, any of the voltages of the plurality of secondary battery cells is smaller than the set voltage for the single battery or the output voltage of the assembled battery is smaller than the set voltage for the assembled battery, and there is no communication from the upper circuit. After the state continues for a predetermined time, when all of the voltages of the plurality of secondary battery cells are equal to or higher than the set voltage for the single battery or the output voltage of the assembled battery is equal to or higher than the set voltage for the assembled battery, the wake-up to the power supply circuit is performed. Output an up signal,
The assembled battery module according to claim 1, wherein the power supply circuit is activated when the wakeup signal is received from the determination circuit.   The value of the set voltage for the single battery is larger than the voltage at which the secondary battery cell is overdischarged, and the value of the set voltage for the battery pack is the voltage at which the secondary battery cell constituting the assembled battery is overdischarged 3. The assembled battery module according to claim 1, wherein the battery pack module is larger than the sum of the battery packs.   4. The determination circuit according to claim 1, wherein the determination circuit receives a power control signal from the upper circuit and outputs a shutdown signal to the power circuit when the power control signal is at a first level. The assembled battery module of any one of Claims.   The group according to any one of claims 1 to 4, wherein the determination circuit outputs a shutdown signal to the power supply circuit when an output voltage of the assembled battery is smaller than a circuit operating voltage. Battery module. An assembled battery module according to any one of claims 1 to 5,
An assembled battery management device for transmitting a power control signal to the assembled battery module;
And an axle driven by electric power from the assembled battery module.

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