JP2013135584A - Secondary battery device and vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle and a secondary battery device that realize low power consumption.SOLUTION: A secondary battery device includes: a battery pack BT that includes a plurality of secondary battery cells; a battery monitoring device 14 that detects voltages and temperatures of the secondary battery cells; a current monitoring device 18 that detects a current flowing to a main circuit; and a battery management device that includes an SOP (charge) calculation part 163C for calculating an SOP in a charge direction of the battery pack BT from the voltages and the temperatures detected by the battery monitoring device 14 and the current detected by the current monitoring device, an SOP (discharge) calculation part 163D for calculating an SOP in a discharge direction of the battery pack BT, an overcharge protection part 165A for calculating protection information for an overcharge from the voltages detected by the battery monitoring device 14, an overdischarge protection part 165B for calculating protection information for an overdischarge from the voltages detected by the battery monitoring device 14, and a function execution propriety selection part 169 for switching between execution and a skip of the processing by the SOP (charge) calculation part 163C, the SOP (discharge) calculation part 163D, the overcharge protection part 165A, and the overdischarge protection part 165B.

Description

  Embodiments described herein relate generally to a secondary battery device and a vehicle.

  A vehicle such as an electric vehicle includes a secondary battery device, a motor fed from the secondary battery device, and an axle driven by the motor.

  The secondary battery device includes a battery pack including a plurality of secondary battery cells, and a battery management system (BMS) that monitors the voltage, temperature, state of charge (SOC), etc. of the secondary battery cells. It has. The battery management system includes a battery monitoring device (VTM) that detects the voltage and temperature of a secondary battery cell, and a battery management device (BMU: Battery Management Unit) that controls charging and discharging of the secondary battery device. . The battery management device performs a state of charge (SOC) using the voltage and temperature received from the battery monitoring device and the discharging current or charging current of the assembled battery received from the current measuring device, and further Information is output to a communication means such as a CAN (controller area network) bus communication line toward the control device.

JP 2007-209168 A

  For example, when the secondary battery device is mounted on a vehicle such as an electric vehicle, the device mounted on the vehicle is required to have low power consumption in order to extend the cruising distance when the assembled battery is fully charged. .

  However, in the battery management system, the voltage and temperature are measured by a task that operates at a fixed period, and the SOC is calculated. For this reason, the processor is always operating in the battery management system, which has been a factor in increasing power consumption.

  Embodiments of the present invention have been made in view of the above circumstances, and an object thereof is to provide a secondary battery device and a vehicle that realize low power consumption.

  According to the embodiment, an assembled battery including a plurality of secondary battery cells, a battery monitoring device that detects a voltage and a temperature of the secondary battery cell, a current monitoring device that detects a current flowing through a main circuit, and the battery An SOP (charging) computing unit that computes the SOP in the charging direction of the assembled battery from the voltage and temperature detected by the monitoring device and the current detected by the current monitoring device, and calculates the SOP in the discharging direction of the assembled battery SOP (discharge) calculation unit, overcharge protection unit for calculating protection information against overcharge from the voltage detected by the battery monitoring device, and overdischarge for calculating protection information against overdischarge from the voltage detected by the battery monitoring device Based on the signal received from the outside and the protection unit, the processing of the SOP (charge) calculation unit, the SOP (discharge) calculation unit, the overcharge protection unit and the overdischarge protection unit is executed or skipped Rechargeable battery device or a function executability selection unit for switching to a battery management system having a, comprising the to are provided.

FIG. 1 is a block diagram schematically illustrating a configuration example of a vehicle according to an embodiment. FIG. 2 is a block diagram schematically showing a configuration example of the battery management apparatus for the vehicle shown in FIG. FIG. 3 is a flowchart for explaining an example of the operation of the vehicle battery management device and the vehicle management device shown in FIG. FIG. 4 is a flowchart for explaining another example of operations of the vehicle battery management device and the vehicle management device shown in FIG. FIG. 5 is a timing chart for explaining an example of operation timings of the vehicle battery management device and the vehicle management device shown in FIG.

  Hereinafter, a vehicle according to an embodiment will be described with reference to the drawings.

  FIG. 1 schematically shows a configuration example of a vehicle according to the first embodiment. The vehicle according to the present embodiment is, for example, an electric vehicle or a hybrid vehicle, and is mounted with the secondary battery device 10 according to the embodiment.

  The vehicle of this embodiment includes a secondary battery device 10, a vehicle management device 20, a brake management device 40, an inverter 50, a motor 60, an axle 70, and a wheel management device 80.

  The secondary battery device 10 includes an assembled battery BT including a plurality of secondary battery cells, a battery monitoring device 14 that measures the voltage and temperature of the assembled battery BT, a current monitoring device 18, a battery management device 16, and a battery. A bus communication line BL1 used for communication between the monitoring device 14 and the battery management device 16.

  The assembled battery BT includes a plurality of secondary battery cells connected in series and in parallel. The secondary battery cell is, for example, a lithium ion storage battery. The secondary battery cell is not limited to a lithium ion storage battery, and may be other storage battery cells such as a nickel hydride storage battery, a lead storage battery, and a nickel / cadmium storage battery.

  The battery monitoring device 14 periodically measures the voltage and temperature of a plurality of secondary battery cells constituting the assembled battery BT and outputs the measured voltage and temperature to the bus communication line BL1. In addition, the battery monitoring device 14 includes an internal filter process for removing noise from the measured voltage and temperature values, an equalization process (cell balance process) for equalizing the charge amounts of a plurality of secondary battery cells, and the like. Process. The battery monitoring device 14 is supplied with power from the assembled battery BT.

  The current monitoring device 18 includes detection means for detecting current flowing through the plurality of assembled batteries BT. The detecting means for detecting the current is, for example, a shunt resistor.

  The battery management device 16 communicates with the battery monitoring device 14 and the vehicle management device 20 via the bus communication lines BL1 and BL2, and a control circuit that monitors the voltage value and the like of the assembled battery BT and manages charging and discharging. A communication system (not shown). The battery management device 16 is supplied with power from a vehicle power supply (12V lead storage battery) (not shown).

  The battery management device 16 receives the voltage values of the plurality of secondary battery cells constituting each assembled battery BT and the temperature values of the assembled battery BT from the plurality of battery monitoring devices 14 via the bus communication line BL1. The state of the secondary battery cell is monitored. Further, the battery management device 16 transmits a low power consumption mode switching notification and a return notification from the low power consumption mode, which will be described later, to the plurality of battery monitoring devices 14. Further, the battery management device 16 periodically acquires the current value measured by the current monitoring device 18.

  The battery management device 16 calculates the SOC value of the secondary battery device 10 (the secondary battery device 10, the assembled battery BT, or the SOC value of the secondary battery cell) from the received voltage value, temperature value, and current value, Data such as maximum and minimum values of voltage, maximum and minimum values of temperature, SOC value, and a signal notifying the abnormality of the secondary battery cell are transmitted to the vehicle management device 20.

  The motor management device 30 communicates with the vehicle management device 20 via the bus communication line BL5, and controls the inverter 50 according to the torque requested from the vehicle management device 20.

  The inverter 50 converts the voltage supplied from the secondary battery device 10 based on the control signal from the motor management device 30, and receives the operation command to perform level control and phase control of the output current and voltage. The output of the inverter 50 is supplied to the motor 60 as drive power.

  The motor 60 is rotated by electric power supplied from the inverter 50. The power generated by the rotation of the motor 60 is transmitted to the axle 70 and the wheels WR and WL via, for example, a differential gear unit.

  The brake management device 40 detects the depression amount of the brake pedal that the user has depressed from a brake pedal sensor (not shown), and transmits the depression amount of the brake pedal to the vehicle management device 20 via the bus communication line BL3.

  The accelerator management device 90 detects the amount of depression of the accelerator pedal that the user has depressed from an accelerator pedal sensor (not shown), and transmits the amount of depression of the accelerator pedal to the vehicle management device 20 via the bus communication line BL6.

  The wheel management device 80 detects the number of rotations of the wheels WR and WL and transmits it to the vehicle management device 20 via the bus communication line BL4.

  The vehicle management device 20 coordinates various functions mounted on the vehicle, for example, the secondary battery device 10, a transmission (not shown), a charger (not shown), an inverter 50, a motor 60, and the like. Make it work. The vehicle management device 20 is connected to the secondary battery device 10 from the battery management device 16 via the bus communication line BL2, in a state of charge (SOC), a state of health (SOH), and a chargeable / dischargeable power (SOP). power), maximum and minimum values of voltage, maximum and minimum values of temperature, and protection information, and control signals for controlling the operation of the battery management device 16 are transmitted. The protection information received by the vehicle management device 20 includes overcharge protection information for protecting a secondary battery in an overcharged state, and overdischarge protection information for protecting a secondary battery in an overdischarged state. .

  Moreover, the vehicle management apparatus 20 receives the depression amount of a brake pedal from the brake management apparatus 40 via the bus communication line BL3. The vehicle management device 20 receives the amount of depression of the accelerator pedal from the accelerator management device 90 via the bus communication line BL6. The vehicle management device 20 receives the rotation speeds of the wheels WL and WR from the wheel management device 80 via the bus communication line BL4.

  The bus communication lines BL1 to BL6 are bus communication lines configured based on, for example, a CAN (Control Area Network) standard. The plurality of battery monitoring devices 14 and the battery management device 16 communicate with each other via the bus communication line BL1 using an identification code assigned to each of them.

  FIG. 2 is a block diagram schematically illustrating a configuration example of the secondary battery device and the battery management device 16 and the vehicle management device 20 mounted on the vehicle according to the embodiment.

  The battery management device 16 includes a cell voltage monitor unit 162, a cell temperature monitor unit 164, a current monitor unit 166, a cell balance unit 168, a calculation unit 163, a protection unit 165, a function execution availability selection unit 169, It has.

  The cell voltage monitor unit 162 receives the voltage values of the plurality of secondary battery cells detected by the battery monitoring device 14, periodically outputs the received voltage values to the calculation unit 163 and the protection unit 165, and receives them. The maximum value and the minimum value of the plurality of voltage values are periodically output to the vehicle management device 20.

  The cell temperature monitoring unit 164 receives the temperature values of the plurality of secondary battery cells detected by the battery monitoring device 14, periodically outputs the received temperature values to the calculation unit 163 and the protection unit 165, and receives them. The maximum value and the minimum value of the plurality of temperature values are periodically output to the vehicle management device 20.

  The current monitor unit 166 receives the current value flowing in the main circuit detected by the current monitoring device 18 and periodically outputs the current value to the calculation unit 163.

  The calculation unit 163 includes an SOC calculation unit 163A, an SOH calculation unit 163B, an SOP (charge) calculation unit 163C, and an SOP (discharge) calculation unit 163D.

  The SOC calculation unit 163A receives the voltage value, temperature value, and current value of the plurality of secondary battery cells, and calculates the SOC of the assembled battery BT using these values. The SOC calculation unit 163A calculates, for example, the SOC of the battery pack BT by appropriately correcting the value obtained by integrating the current value using the voltage value or the temperature value, and the vehicle management device 20, the SOH calculation unit 163B, and the cell The data is output to the balance unit 168.

  The SOH computing unit 163B receives the SCO from the SOC computing unit 163A, and computes the corresponding SOH using, for example, a table storing data representing the relationship between the charging / discharging current history, temperature history, time history history and SOH, etc. Then, the SOH is output to the vehicle management device 20, the SOP (charge) calculation unit 163C, and the SOP (discharge) calculation unit 163D. Note that if the SOC is necessary for the SOP calculation, the SOH calculation unit 163B also outputs the SOC value to the SOP (charge) calculation unit 163C and the SOP (discharge) calculation unit 163D.

  The SOP (charging) calculation unit 163C receives the SOH from the SOH calculation unit 163B, calculates, for example, a maximum allowable value of the charging current using a table for SOP calculation based on experimental data in advance, and performs SOP (SOP) in the charging direction. (Charging) is output to the vehicle management device 20.

  The SOP (discharge) calculation unit 163D receives the SOH from the SOH calculation unit 163B, calculates, for example, a maximum allowable value of the discharge current in advance using a table for SOP calculation based on experimental data, and performs SOP (SOP) in the discharge direction. (Discharge)) is output to the vehicle management device 20.

  The cell balance unit 168 receives the voltages of the plurality of secondary battery cells from the cell voltage monitor unit 162, and controls the battery monitoring device 14 so that the charged amounts of the plurality of secondary battery cells are equalized. The battery monitoring device 14 has a cell balance circuit (not shown) that switches connections so that the secondary battery cells of the assembled battery BT can be individually charged and discharged. The cell balance unit 168 outputs a control signal for controlling the switching timing of the cell balance circuit to the battery monitoring device 14 from the voltages of the plurality of secondary battery cells.

The protection unit 165 includes an overcharge protection unit 165A and an overdischarge protection unit 165B.
The overcharge protection unit 165A periodically receives the voltage value of the secondary battery cell from the cell voltage monitor unit 162, determines whether to protect against overcharge depending on whether the voltage value is equal to or greater than a predetermined value, Information is transmitted to the vehicle management device 20. The protection information against overcharge is a value indicating whether or not to protect, and may be information having a plurality of stages, for example.

  The overdischarge protection unit 165B periodically receives the voltage value of the secondary battery cell from the cell voltage monitor unit 162, determines whether to protect against overdischarge depending on whether the voltage value is equal to or less than a predetermined value, Information is output to the vehicle management apparatus 20. The protection information against overdischarge is a value indicating whether or not to protect, and may be information having a plurality of stages, for example.

  The function execution availability selection unit 169 receives the scheduled charge / discharge direction from the vehicle management device 20 and switches the processing executed by the calculation unit 163 and the protection unit 165. That is, in a vehicle equipped with the secondary battery device, when the vehicle is powered, current flows only in the discharge direction in the main circuit, and in regeneration, current flows only in the charge direction in the main circuit and stops. In the case of no current flows. Based on this, the function execution enable / disable selection unit 169 switches processing executed by the calculation unit 163 and the protection unit 165, and performs SOP (charge) calculation and processing related to overcharge protection when the vehicle is in power running. In the case of regeneration, processing relating to SOP (discharge) calculation and overdischarge protection is skipped in the case of regeneration, and both are skipped in the case of stop. As a result, the operation time of the arithmetic circuit in the battery management device 16 is reduced, and as a result, the power consumption of the battery management device 16 is reduced.

The vehicle management device 20 includes a storage unit 22.
The storage unit 22 stores SOP (charge), overcharge protection information, SOP (discharge), and overdischarge protection information. The storage unit 22 updates the stored information with the information received from the battery management device 16.

  The vehicle management device 20 uses the SOP (charge), overcharge protection information, SOP (discharge), and overdischarge protection information stored in the storage unit 22 to calculate the torque value to be output to the motor management device 30. , Have a limit. The torque limit requires different information depending on the driving mode of the vehicle. At the time of braking (minus torque), the vehicle management device 20 limits torque using SOP (charging) and overcharge protection information. During power running (plus torque), the vehicle management device 20 performs torque limitation using SOP (discharge) and overdischarge protection information. During coasting and stopping (zero torque), the vehicle management device 20 does not limit the torque.

  As described above, in the vehicle and the secondary battery device of the present embodiment, only the information required for torque limitation of the vehicle management device 20 is calculated by the battery management device 16 and notified to the vehicle management device 20. By doing so, the processing in the battery management device 16 can be appropriately skipped, and the calculation time of the battery management device 16 can be reduced.

Hereinafter, an example of the operation of the secondary battery device and the vehicle of the present embodiment will be specifically described.
FIG. 3 is a flowchart for explaining an example of operations of battery management device 16 and vehicle management device 20 of the vehicle shown in FIG. In this example, one cycle of processing is shown for each of the battery management device 16 and the vehicle management device 20 when the planned charge / discharge direction is transmitted from the vehicle management device 20 to the function execution availability selection unit 169.

  The battery management device 16 first receives the voltage and temperature values of the secondary battery cells from the battery monitoring device 14 and also receives the current value flowing through the main circuit from the current monitoring device 18 (step SA1).

  Subsequently, the maximum value and the minimum value of the voltage value of the secondary battery cell received by the cell voltage monitor unit 162 are calculated, and the maximum value and the minimum value of the voltage value of the secondary battery cell received by the cell temperature monitor unit 164 are calculated. Is calculated (step SA2).

  Subsequently, the cell balance unit 168 receives the voltage of the secondary battery cell from the cell voltage monitor unit 162, and individually sets the secondary battery cells of the assembled battery BT so that the storage amount of the secondary battery cell becomes equal. A control signal is output to the battery monitoring device 14 so as to be charged and discharged (step SA3).

  Subsequently, the SOC calculation unit 163A and the SOH calculation unit 163B calculate the SOC and SOH of the assembled battery BT (step SA4).

  Subsequently, the function execution availability selection unit 169 reads the scheduled charge / discharge direction from the vehicle management device 20 (step SA5). Note that the timing at which the function execution availability selection unit 169 reads the torque from the vehicle management device 20 is not limited to the case shown in FIG. The function execution availability selection unit 169 may store the torque read from the vehicle management device 20 at a predetermined timing in a memory (not shown), and read the torque by interrupt processing according to the processing cycle of the vehicle management device 20. Also good. In that case, the function execution availability selection unit 169 reads and uses the planned charge / discharge direction from the memory at the timing of step SA5.

  The function execution availability selection unit 169 determines whether the read scheduled charge / discharge direction is the charge direction, the discharge direction, or zero (step SA6).

  When the charge / discharge direction is the charge direction, the function execution enable / disable selection unit 169 executes processing of the SOP (charge) calculation unit 163C and the overcharge protection unit 165A, and performs the SOP (discharge) calculation unit 163D and the overdischarge protection. The processing of the calculation unit 163 and the protection unit 165 is switched so as to skip the processing with the unit 165B. Therefore, in this case, the SOP (charging) calculating unit 163C of the calculating unit 163 calculates SOP (charging), and determines whether or not the overcharge protection unit 165A of the protection unit 165 should protect against overcharging (step SA7). ).

  Subsequently, the SOP (charging) calculated in step SA7 and the protection information for overcharging are output to the vehicle management device 20 (step SA9).

  When the charge / discharge direction is the discharge direction, the function execution enable / disable selecting unit 169 executes processing of the SOP (discharge) calculation unit 163D and the overdischarge protection unit 165B, and performs the SOP (charge) calculation unit 163C and the overcharge protection. The processing of the arithmetic unit 163 and the protection unit 165 is switched so as to skip the processing with the unit 165A. Therefore, in this case, the SOP (discharge) calculation unit 163D of the calculation unit 163 calculates SOP (discharge), and determines whether or not the overdischarge protection unit 165B of the protection unit 165 should protect against overdischarge (step SA8). ).

  Subsequently, the SOP (discharge) calculated in step SA8 and the protection information against overdischarge are output to the vehicle management device 20 (step SA9).

  When the charging direction is zero, the function execution propriety selection unit 169 performs the processing of the SOP (charging) calculation unit 163C, the SOP (discharge) calculation unit 163D, the overcharge protection unit 165A, and the overdischarge protection unit 165B. The processing of the calculation unit 163 and the protection unit 165 is switched so as to be skipped, and the processing ends.

  The SOP (charge), SOP (discharge), overcharge protection information, and overdischarge protection information output to the vehicle management device 20 in step SA9 are recorded in the storage unit 22 of the vehicle management device 20, and the storage unit 22 stores the information. Updated.

  The vehicle management device 20 first reads the accelerator pedal depression amount from the accelerator management device 90 (step SB1).

  Subsequently, the vehicle management device 20 reads the brake pedal depression amount from the brake management device 40 (step SB2).

  Subsequently, the vehicle management device 20 reads the rotation speeds of the wheels WL and WR from the wheel management device 80 (step SB3).

    Next, the vehicle management device 20 calculates a planned charge / discharge direction from the accelerator pedal depression amount, the brake pedal depression amount, and the wheel rotation speed (step SB4). The vehicle management device 20 determines from the accelerator pedal depression amount, the brake pedal depression amount, and the wheel rotational speed whether the torque calculated by the torque calculation is negative, positive, zero, and whether the vehicle speed is zero. can do. The planned charge / discharge direction is a value corresponding to any of the charge direction (during power running), the discharge direction (during regeneration), and zero (during coasting / stop). The vehicle management device outputs the calculated scheduled charge / discharge direction to the battery management device 16.

  Subsequently, the vehicle management device 20 calculates the torque of the motor 60 according to the accelerator pedal depression amount, the brake pedal depression amount, and the wheel rotation speed (step SB5).

  Subsequently, the vehicle management device 20 determines whether the torque value calculated in step SB5 is positive, negative, or zero (step SB6).

  When the torque is a negative value, a current flows in the charging direction in the main circuit of the secondary battery device. Therefore, the vehicle management device 20 limits the torque calculated in step SB5 using the SOP (charging) stored in the storage unit 22 and the protection information against overcharging (step SB7).

  When the torque is a positive value, a current flows in the discharge direction through the main circuit of the secondary battery device. Therefore, the vehicle management device 20 uses the SOP (discharge) stored in the storage unit 22 and the protection information against overdischarge to limit the torque calculated in step SB5 (step SB8).

  When the torque is zero, no current flows through the main circuit of the secondary battery device, so the vehicle management device 20 does not limit the torque.

  Finally, the vehicle management device 20 outputs the torque after performing the necessary restriction to the motor management device 30 (step SB9), and ends the process.

  As described above, according to the present embodiment, the secondary battery device and the vehicle that achieve low power consumption by appropriately skipping the processing in the battery management device 16 and reducing the calculation time of the battery management device 16. Can be provided.

  Next, a vehicle and a secondary battery device according to a second embodiment will be described with reference to the drawings. In the following description, the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

In the present embodiment, the vehicle management device 20 transmits torque corresponding to the accelerator depression amount, the brake depression amount, and the wheel rotation number of the vehicle to the function execution availability selection unit 169. Hereinafter, an example of the operation of the secondary battery device and the vehicle of the present embodiment will be specifically described.
FIG. 4 is a flowchart for explaining another example of the operation of battery management device 16 and vehicle management device 20 of the vehicle shown in FIG. In this example, one cycle of processing is shown for each of the battery management device 16 and the vehicle management device 20 when the planned charge / discharge direction is transmitted from the vehicle management device 20 to the function execution availability selection unit 169.

  The battery management device 16 first receives the voltage and temperature values of the secondary battery cells from the battery monitoring device 14 and also receives the current value flowing through the main circuit from the current monitoring device 18 (step SC1).

  Subsequently, the maximum value and the minimum value of the voltage value of the secondary battery cell received by the cell voltage monitor unit 162 are calculated, and the maximum value and the minimum value of the voltage value of the secondary battery cell received by the cell temperature monitor unit 164 are calculated. Is calculated (step SC2).

  Subsequently, the cell balance unit 168 receives the voltage of the secondary battery cell from the cell voltage monitor unit 162, and individually sets the secondary battery cells of the assembled battery BT so that the storage amount of the secondary battery cell becomes equal. A control signal is output to the battery monitoring device 14 so as to be charged and discharged (step SC3).

  Subsequently, the SOC calculation unit 163A and the SOH calculation unit 163B calculate the SOC and SOH of the assembled battery BT (step SC4).

  Subsequently, the function execution availability selection unit 169 reads the torque from the vehicle management device 20 (step SC5). Note that the timing at which the function execution availability selection unit 169 reads the torque from the vehicle management device 20 is not limited to the case shown in FIG. The function execution availability selection unit 169 may store the torque read from the vehicle management device 20 at a predetermined timing in a memory (not shown), and read the torque by interrupt processing according to the processing cycle of the vehicle management device 20. Also good. In that case, the function execution availability selection unit 169 reads and uses the scheduled charge / discharge direction from the memory at the timing of step SC5.

  The function execution possibility selection unit 169 determines whether the planned charge / discharge direction is the charge direction, the discharge direction, or zero based on whether the read torque is positive, negative, or zero (step SC6).

  When the charge / discharge direction is the charge direction, the function execution enable / disable selection unit 169 executes processing of the SOP (charge) calculation unit 163C and the overcharge protection unit 165A, and performs the SOP (discharge) calculation unit 163D and the overdischarge protection. The processing of the calculation unit 163 and the protection unit 165 is switched so as to skip the processing with the unit 165B. Therefore, in this case, the SOP (charging) calculating unit 163C of the calculating unit 163 calculates SOP (charging), and determines whether or not the overcharge protection unit 165A of the protection unit 165 should protect against overcharging (step SC7). ).

  Subsequently, the SOP (charging) calculated in step SA7 and the protection information for overcharging are output to the vehicle management device 20 (step SC9).

  When the charge / discharge direction is the discharge direction, the function execution enable / disable selecting unit 169 executes processing of the SOP (discharge) calculation unit 163D and the overdischarge protection unit 165B, and performs the SOP (charge) calculation unit 163C and the overcharge protection. The processing of the arithmetic unit 163 and the protection unit 165 is switched so as to skip the processing with the unit 165A. Accordingly, in this case, the SOP (discharge) calculation unit 163D of the calculation unit 163 calculates SOP (discharge), and determines whether or not the overdischarge protection unit 165B of the protection unit 165 should protect against overdischarge (step SC8). ).

  Subsequently, the SOP (discharge) calculated in step SA8 and the protection information against overdischarge are output to the vehicle management apparatus 20 (step SC9).

  When the charging direction is zero, the function execution propriety selection unit 169 performs the processing of the SOP (charging) calculation unit 163C, the SOP (discharge) calculation unit 163D, the overcharge protection unit 165A, and the overdischarge protection unit 165B. The processing of the calculation unit 163 and the protection unit 165 is switched so as to be skipped, and the processing ends.

  The SOP (charge), SOP (discharge), overcharge protection information, and overdischarge protection information output to the vehicle management device 20 in step SA9 are recorded in the storage unit 22 of the vehicle management device 20, and the storage unit 22 stores the information. Updated.

  First, the vehicle management device 20 reads the accelerator pedal depression amount from the accelerator management device 90 (step SD1).

  Subsequently, the vehicle management device 20 reads the brake pedal depression amount from the brake management device 40 (step SD2).

  Subsequently, the vehicle management device 20 reads the rotation speeds of the wheels WL and WR from the wheel management device 80 (step SD3).

  Next, the vehicle management device 20 calculates the torque of the motor 60 according to the accelerator pedal depression amount, the brake pedal depression amount, and the wheel rotation speed (step SD4). The vehicle management device 20 outputs the calculated torque to the function execution availability selection unit 169.

  Subsequently, the vehicle management apparatus 20 determines whether the torque value calculated in step SD4 is positive, negative, or zero (step SD5).

  When the torque is a negative value, a current flows in the charging direction in the main circuit of the secondary battery device 10. Therefore, the vehicle management device 20 uses the SOP (charging) stored in the storage unit 22 and the protection information against overcharging to limit the torque calculated in step SD4 (step SD6).

  When the torque is a positive value, a current flows in the discharge direction through the main circuit of the secondary battery device. Therefore, the vehicle management device 20 limits the torque calculated in step SB5 using the SOP (discharge) stored in the storage unit 22 and the protection information against overdischarge (step SD7).

  When the torque is zero, no current flows through the main circuit of the secondary battery device, so the vehicle management device 20 does not limit the torque.

  Finally, the vehicle management device 20 outputs the torque after performing the necessary restriction to the motor management device 30 (step SD8), and ends the process.

  As described above, according to the present embodiment, the secondary battery device and the vehicle that achieve low power consumption by appropriately skipping the processing in the battery management device 16 and reducing the calculation time of the battery management device 16. Can be provided.

FIG. 5 is a timing chart for explaining an example of operation timings of the vehicle battery management device 16 and the vehicle management device 20 of FIG.
Here, in the vehicle and the secondary battery device 10 of the first embodiment and the second embodiment, at the timing when charging and discharging are switched due to a communication error between the battery management device 16 and the vehicle management device 20 or the like. Consider the case where the update of the storage unit 22 is not in time for the torque limit.

  First, when the charging direction (or positive torque) is transmitted from the vehicle management device 20 to the battery management device 16 as the planned charging / discharging direction, the battery management device 16 calculates SOP (charging) and performs overcharge protection. Calculation is performed, SOP (charging) and overcharge protection information (charging direction information) are transmitted to the vehicle management device 20, and the information stored in the storage unit 22 is updated to the charging / discharging direction information # 1. . In this case, the vehicle management device 20 performs torque limitation using the charging direction information # 1 stored in the storage unit 22. Therefore, the vehicle management device 20 can limit the torque by the latest charging direction information.

  Next, when the planned charge / discharge direction is switched to the discharge direction, when the discharge direction (or minus torque) is transmitted as the planned charge / discharge direction from the vehicle management device 20 to the battery management device 16, the battery management device 16 SOP (discharge) calculation and overdischarge protection calculation are performed, and SOP (discharge) and overdischarge protection information (discharge direction information) are transmitted to the vehicle management device 20 and stored in the storage unit 22. The information is updated to discharge direction information # 2. In this case, the vehicle management apparatus 20 uses the discharge direction information # 2 stored in the storage unit 22 to perform torque limitation. Therefore, the vehicle management device 20 can limit the torque based on the latest discharge direction information.

  Next, when the planned charging / discharging direction is switched to the charging direction, when the charging direction (or positive torque) is transmitted from the vehicle management device 20 to the battery management device 16 as the planned charging / discharging direction, the battery management device 16 performs SOP. The calculation of (charging) and the calculation of overcharge protection are performed, and SOP (charging), protection information for overcharging and (charging direction information) are transmitted to the vehicle management device 20. At this time, if the transmission of the charging direction information fails due to a communication error or the like, the charging direction information stored in the storage unit 22 is not updated. At this time, the charging direction information stored in the storage unit 22 is charging direction information # 1 when the secondary battery device 10 is switched from charging to discharging. Since the secondary battery device 10 is subsequently discharged, the storage unit 22 is not updated, but in reality, the SOP (charging) is larger than the charging direction information # 1, and the overcharge protection information is also stored in the storage unit. This is more relaxed than the charging direction information # 1 of 22. Therefore, even when the vehicle management device 20 performs torque limitation using the charging direction information # 1 stored in the storage unit 22 at this timing, the secondary battery device 10 does not fall into a dangerous state. The safety of the secondary battery device 10 can be ensured.

  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.

  BT ... Battery, WR, WL ... Wheel, BL1 to BL6 ... Bus communication line, 10 ... Secondary battery device, 14 ... Battery monitoring device, 16 ... Battery management device, 163 ... Calculation unit, 163C ... SOP (charging) calculation 163D ... SOP (discharge) calculation unit, 165 ... protection unit, 165A ... overcharge protection unit, 165B ... overdischarge protection unit, 169 ... function execution availability selection unit, 18 ... current monitoring device, 20 ... vehicle management device, DESCRIPTION OF SYMBOLS 22 ... Memory | storage part, 30 ... Motor management apparatus, 40 ... Brake management apparatus, 50 ... Inverter, 60 ... Motor, 70 ... Axle, 90 ... Accelerator management apparatus, 80 ... Wheel management apparatus.

Claims (3)

An assembled battery including a plurality of secondary battery cells;
A battery monitoring device for detecting the voltage and temperature of the secondary battery cell;
A current monitoring device for detecting the current flowing in the main circuit;
An SOP (charging) calculation unit that calculates an SOP in the charging direction of the assembled battery from the voltage and temperature detected by the battery monitoring device and the current detected by the current monitoring device, and an SOP in the discharging direction of the assembled battery An SOP (discharge) calculation unit that calculates, an overcharge protection unit that calculates protection information against overcharge from the voltage detected by the battery monitoring device, and protection information against overdischarge from the voltage detected by the battery monitoring device Whether to execute or skip the processing of the SOP (charge) calculation unit, the SOP (discharge) calculation unit, the overcharge protection unit, and the overdischarge protection unit based on an overdischarge protection unit and a signal received from the outside A secondary battery device comprising: a battery management device including a function execution availability selection unit that switches between the two. A secondary battery device according to claim 1;
An inverter that converts DC power output from the secondary battery device;
A motor driven by the electric power output from the inverter;
A wheel to which power for rotating the motor is transmitted;
A wheel management device for detecting the number of rotations of the wheel;
A brake management device that detects the amount of depression of the brake pedal;
An accelerator management device that detects the amount of depression of the accelerator pedal;
The storage unit stores the SOP in the charging direction, the SOP in the discharging direction, the overcharge protection information, and the overdischarge protection information received from the secondary battery device, and the amount of depression of the brake pedal, the accelerator pedal The amount of depression, the amount of depression of the brake pedal, and the number of wheel rotations are received, the estimated charge / discharge direction is calculated and output to the function execution availability selection unit, the amount of depression of the accelerator pedal, and A vehicle management device that calculates a torque according to the number of rotations of the wheel and limits the torque using information stored in the storage unit according to the torque,
When the planned charge / discharge direction is the charge direction, the function execution availability selection unit skips the processing of the SOP (discharge) calculation unit and the overdischarge protection unit, and the planned charge / discharge direction is the discharge direction. The SOP (charge) calculation unit and the overcharge protection unit are skipped, and when the scheduled charge / discharge direction is zero, the SOP (charge) calculation unit, the SOP (discharge) calculation unit, and the The vehicle is switched so as to skip the processing of the overcharge protection unit and the overdischarge protection unit. A secondary battery device according to claim 1;
An inverter that converts DC power output from the secondary battery device;
A motor driven by the electric power output from the inverter;
A wheel to which power for rotating the motor is transmitted;
A wheel management device for detecting the number of rotations of the wheel;
A brake management device that detects the amount of depression of the brake pedal;
An accelerator management device that detects the amount of depression of the accelerator pedal;
The storage unit stores the SOP in the charging direction, the SOP in the discharging direction, the overcharge protection information, and the overdischarge protection information received from the secondary battery device, and the amount of depression of the brake pedal, the accelerator pedal The stepping amount and the wheel rotation number are received, and the torque corresponding to the stepping amount of the accelerator pedal, the stepping amount of the brake pedal, and the rotation number of the wheel is calculated, and the torque is calculated as described above. A vehicle management device that outputs to a function execution enable / disable selection unit and limits the torque using information stored in the storage unit according to the torque;
When the planned charge / discharge direction corresponding to the torque is a charge direction, the function execution propriety selection unit skips the processing of the SOP (discharge) calculation unit and the overdischarge protection unit and plans to correspond to the torque When the charge / discharge direction is the discharge direction, the processing of the SOP (charge) calculation unit and the overcharge protection unit is skipped, and when the planned charge / discharge direction corresponding to the torque is zero, the SOP (charge) A vehicle characterized by switching so as to skip the processing of the calculation unit, the SOP (discharge) calculation unit, the overcharge protection unit, and the overdischarge protection unit.

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