WO2023238817A1 - Système de batterie et procédé de charge pour batterie - Google Patents

Système de batterie et procédé de charge pour batterie Download PDF

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Publication number
WO2023238817A1
WO2023238817A1 PCT/JP2023/020792 JP2023020792W WO2023238817A1 WO 2023238817 A1 WO2023238817 A1 WO 2023238817A1 JP 2023020792 W JP2023020792 W JP 2023020792W WO 2023238817 A1 WO2023238817 A1 WO 2023238817A1
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WIPO (PCT)
Prior art keywords
battery
temperature
charging
heater
control unit
Prior art date
Application number
PCT/JP2023/020792
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English (en)
Japanese (ja)
Inventor
保 大森
均 丸山
英訓 梶山
卓矢 佐藤
亮輔 鯉江
翠梨 青木
Original Assignee
株式会社豊田自動織機
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Application filed by 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Publication of WO2023238817A1 publication Critical patent/WO2023238817A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • H01M10/6571—Resistive heaters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • a battery system including a charging mechanism, a temperature increasing mechanism, and a control section is described in Patent Document 1.
  • the control unit prohibits the temperature raising process and executes the charging process, so that the SOC of the battery reaches the charging reference value.
  • the control unit stops the temperature raising process and charges the battery to the charging stop value.
  • the SOC is estimated from the open circuit voltage (OCV) of the battery in many cases.
  • the fully charged state can also be detected based on the terminal voltage and charging current of the battery.
  • a current may flow to raise the temperature even when the battery is nearly fully charged. For this reason, it is difficult to manage the charging current, and it is difficult to accurately determine whether a fully charged state has been reached.
  • An object of one aspect of the present disclosure is to provide a method for accurately determining whether a battery has reached a fully charged state in a battery system having a function of increasing the temperature of the battery.
  • a battery system includes a battery, a temperature sensor configured to detect the temperature of the battery, a heater configured to heat the battery, and a state of the battery. and a battery control unit configured to control an operation of charging the battery and an operation of increasing the temperature of the battery using the heater.
  • the battery control unit controls the heater according to a comparison between the temperature of the battery and a preset threshold temperature. and further configured to monitor whether the battery has reached a fully charged state with the heater stopped when the charging rate or voltage of the battery is higher than the threshold level.
  • a method of charging a battery includes determining whether a charging rate or voltage of the battery is lower than a predetermined threshold level; and, during charging of the battery, when the charging rate or voltage of the battery is lower than a predetermined threshold level.
  • the heater is controlled according to a comparison between the temperature of the battery and a preset threshold temperature, and when the charging rate or voltage of the battery is equal to or higher than the threshold level, the heater is stopped. and monitoring whether the battery has reached a fully charged state.
  • the heater when the charging rate or voltage of the battery is lower than the threshold level, the heater is controlled according to the comparison between the battery temperature and the threshold temperature. Therefore, the battery is charged in a temperature range with good charging efficiency. In addition, since the heater is stopped when monitoring whether the battery has reached a fully charged state, the effect of the current consumed by the heater on a method that determines full charge based on the current supplied to the battery system Therefore, the accuracy of full charge determination is good.
  • the battery control unit stops the charging operation of the battery and further controls the heater to generate heat.
  • the battery may be configured. According to this configuration, the battery can always be charged in a temperature range with good charging efficiency.
  • a battery system includes a battery, a temperature sensor configured to detect the temperature of the battery, a heater configured to heat the battery, and a state of the battery. and a battery control unit configured to control the operation of charging the battery and the operation of increasing the temperature of the battery using the heater, as well as detecting the outside temperature of the device in which the battery is mounted. It may further include a second temperature sensor.
  • the battery control unit obtains a charge start target temperature corresponding to the outside temperature and the battery charging rate when starting battery charging, and when the battery temperature is lower than the charge start target temperature, , further configured to raise the temperature of the battery to a charging start target temperature using a heater, and to monitor whether the battery has reached a fully charged state with the heater stopped while the battery is being charged. may be done.
  • a method of charging a battery includes obtaining, when starting charging the battery, a charging start target temperature corresponding to an outside temperature of a device in which the battery is mounted and a charging rate of the battery, and a temperature of the battery that corresponds to the charging start target. determining whether or not the battery temperature is lower than the charging start target temperature; and if the battery temperature is lower than the charging start target temperature, the battery temperature is raised to the charging start target temperature using a heater before charging the battery starts. and monitoring whether or not the battery has reached a fully charged state while the heater is stopped while the battery is being charged.
  • the battery since the temperature of the battery at the time of starting charging is equal to or higher than the charging start target temperature, the battery is charged in a temperature range with good charging efficiency. In addition, since the heater is stopped during charging, the accuracy of full charge determination is good.
  • FIG. 6 is a diagram (depending on outside temperature) for explaining temperature control by the battery system according to a variation of the embodiment of the present disclosure.
  • FIG. 6 is a diagram (SOC dependent) for explaining temperature control by the battery system according to a variation of the embodiment of the present disclosure.
  • FIG. 6 is a diagram (SOC dependent) for explaining temperature control by the battery system according to a variation of the embodiment of the present disclosure.
  • FIG. 7 is a diagram illustrating an example of a charging start target temperature table included in a battery system according to a variation of the embodiment of the present disclosure.
  • 12 is a flowchart illustrating an example of charging control and temperature control by the battery system according to a variation of the embodiment of the present disclosure.
  • FIG. 1 shows an example of a battery system 10 according to an embodiment of the present disclosure.
  • the battery system 10 includes a battery 11, a heater 12, a voltage sensor V, a current sensor I, a temperature sensor T1, a temperature sensor T2, a relay RL, and a battery control section 13. Note that the battery system 10 may include other circuits or devices not shown in FIG.
  • the battery 11 is not particularly limited, in this embodiment, it is a lithium ion battery. Moreover, the battery 11 is composed of a plurality of battery packs connected in series and/or in parallel, although the battery 11 is not particularly limited. In this case, each battery pack may be composed of a plurality of battery cells connected in series.
  • the heater 12 is provided near the battery 11 and generates heat in response to instructions from the battery control unit 13. That is, the heater 12 can raise the temperature of the battery 11 according to instructions from the battery control section 13.
  • the heater 12 is realized, for example, by a resistance wire. In this case, the heater 12 generates heat by passing a current through this resistance wire. Furthermore, the battery control unit 13 switches the heater 12 between the on state and the off state by controlling the current flowing through the resistance wire.
  • the voltage sensor V detects the voltage of the battery 11. Note that the voltage sensor V may detect the voltage between the positive terminal and the negative terminal of the battery 11, may detect the voltage of each battery pack, or may detect the voltage of each battery cell. Good too.
  • Current sensor I detects the current flowing through battery 11. However, when using the heater 12, the current sensor I detects the sum of the current flowing through the battery 11 and the current flowing through the heater 12. That is, current sensor I detects the current supplied from charger 20 to battery system 10 . Note that in a configuration in which the current flowing through the battery 11 and the current flowing through the heater 12 are individually detected, the number of current sensors increases and the cost of parts increases. Therefore, in the embodiment of the present disclosure, the sum of the current flowing through the battery 11 and the current flowing through the heater 12 is detected.
  • the temperature sensor T1 is provided near the battery 11 and detects the temperature of the battery 11. Temperature sensor T2 detects outside temperature. For example, in a case where the battery system 10 is mounted on a vehicle, the temperature sensor T2 is configured to detect the temperature around the vehicle. Relay RL can conduct or disconnect the power line connected to battery 11 according to instructions from battery control unit 13 .
  • the battery control unit 13 which is a processing circuit, includes (1) one or more processors that operate according to a computer program (software), and (2) an application-specific integrated circuit (ASIC) that executes at least some of various processes. or (3) a combination thereof.
  • a processor includes a CPU and memory, such as RAM and ROM, where the memory stores program codes or instructions configured to cause the CPU to perform processing.
  • Memory or non-transitory computer-readable media includes any available media that can be accessed by a general purpose or special purpose computer.
  • Various controls by the battery control unit 13 are executed by the CPU executing programs stored in the memory at predetermined calculation cycles.
  • the battery control unit 13 controls the charging operation of the battery 11. At this time, the battery control unit 13 may control the charging current and charging voltage of the battery 11 while exchanging control signals with the charger 20. For example, the battery control unit 13 may transmit a current command value representing the current required by the battery system 10 to the charger 20. Further, the battery control unit 13 detects the state of charge of the battery 11. As the state of charge, for example, the SOC of the battery 11 is calculated. SOC is an index representing the charging rate, and 100 percent and 0 percent represent a fully charged state and a completely discharged state, respectively.
  • CCCV charging the battery 11 is charged with a predetermined constant target current until the voltage of the battery 11 reaches a predetermined target voltage.
  • the operation of charging the battery 11 with a constant current may be referred to as "CC charging.”
  • the current command value representing the target current is notified from the battery control section 13 to the charger control section 22.
  • the charger control unit 22 controls the power circuit 21 so that the current supplied from the charger 20 to the battery system 10 approaches the target current.
  • the battery control section 13 and the charger control section 22 increase the charging current in stages from zero to the target current.
  • the target current may be, for example, the maximum current of the charger 20.
  • the battery control unit 13 monitors the voltage of the battery 11 using the output signal of the voltage sensor V. After the voltage of the battery 11 reaches the target voltage, the battery control unit 13 generates a current command value and transmits it to the charger 20 so as to maintain the target voltage. Then, since the charger control unit 22 controls the power circuit 21 according to the current command value, the battery 11 is charged with a predetermined constant voltage.
  • the operation of charging the battery 11 with a constant voltage may be referred to as "CV charging.”
  • CV charging the operation of charging the battery 11 with a constant voltage
  • FIG. 3 shows an example of CV charging.
  • the voltage of the battery 11 increases due to the CC charging described with reference to FIG. 2, and the voltage of the battery 11 reaches the target voltage at time T0. That is, at time T0, CC charging is switched to CV charging. Therefore, after time T0, the battery control section 13 generates a current command value for maintaining the voltage of the battery 11 at the target voltage and sends it to the charger control section 22. Charger 20 then controls the current supplied to battery 11 according to the current command value.
  • the battery control unit 13 and charger control unit 22 reduce the charging current by ⁇ I at time T0. Then, the voltage of the battery 11 temporarily decreases. After this, the charging operation continues at "target current - ⁇ I". Therefore, the voltage of the battery 11 increases and reaches the target voltage again at time T1. Subsequently, the battery control unit 13 and charger control unit 22 further reduce the charging current by ⁇ I at time T1. Then, the voltage of the battery 11 temporarily decreases. After this, the charging operation continues at "target current -2 ⁇ I". Then, the voltage of the battery 11 reaches the target voltage again at time T2.
  • the battery control unit 13 determines that the battery 11 has reached a fully charged state, and notifies the charger 20 of an instruction to end the charging operation. . At this time, the battery control unit 13 may determine whether the battery 11 is fully charged based on the current command value calculated by itself, or may determine whether the battery 11 is fully charged based on the current value detected using the current sensor I. It may also be determined whether the battery 11 is fully charged.
  • the battery system 10 When increasing the temperature of the battery 11, a portion of the current supplied from the charger 20 is consumed by the heater 12. That is, when the charger 20 generates a current according to the current command value, if the heater 12 is used, the current that actually flows through the battery 11 becomes smaller than the current represented by the current command value. For this reason, when a full charge determination is made based on the charging current, the determination accuracy may deteriorate. Therefore, the battery system 10 according to the embodiment of the present disclosure has a function of stopping the heater 12 and determining full charge as necessary even when the temperature of the battery 11 is low.
  • FIG. 4 is a flowchart showing an example of charging control and temperature control.
  • the battery control unit 13 starts charging control and temperature control.
  • the battery control unit 13 detects the temperature of the battery 11 using the output signal of the temperature sensor T1. Thereafter, the battery control unit 13 monitors the temperature of the battery 11 until charging is completed. In S2, the battery control unit 13 calculates the SOC of the battery 11. Note that the current SOC value is recorded, for example, in a memory (not shown). Further, the battery control unit 13 estimates the SOC of the battery 11 by constantly integrating the charging current and the discharging current measured using the current sensor I.
  • the battery control unit 13 In S3, the battery control unit 13 generates a current command value.
  • the current command value represents a predetermined target current during the period in which CC charging is performed. This target current may be, for example, the maximum current of charger 20. Further, during the period when CV charging is performed, for example, a current command value that realizes the current control described with reference to FIG. 3 is generated. The current command value generated by the battery control unit 13 is notified to the charger 20. Charger 20 then generates a charging current according to the current command value.
  • the battery control unit 13 compares the temperature of the battery 11 with a predetermined threshold temperature X1.
  • the threshold temperature X1 is set, for example, based on the temperature at which the charging efficiency of the battery 11 begins to decrease. Although it depends on the characteristics of the battery 11, the threshold temperature X1 is, for example, about 5°C.
  • the battery control unit 13 compares the SOC of the battery 11 with a predetermined threshold SOC.
  • the threshold SOC is set to a value lower than a region where full charge determination may be affected. For example, in the charging methods shown in FIGS. 2 and 3, it is determined that the battery 11 has reached a fully charged state when the charging current decreases to a predetermined charging end current. Furthermore, after transitioning from CC charging to CV charging, the charging current begins to decrease. Therefore, when monitoring whether a fully charged state has been reached based on the charging current, transition from CC charging to CV charging may affect the full charging determination. That is, the period during which CV charging is performed corresponds to a region where full charge determination may be affected. Therefore, the threshold SOC may be set to a value slightly smaller than the SOC value at which CC charging shifts to CV charging. Alternatively, the threshold SOC may be about 60%, although it is not particularly limited.
  • the battery control unit 13 When the SOC of the battery 11 is lower than the threshold SOC and the temperature of the battery 11 is lower than the threshold temperature X1, the battery control unit 13 operates the temperature raising function. That is, the battery control unit 13 causes current to flow through the heater 12 to generate heat. On the other hand, when the SOC of the battery 11 is equal to or higher than the threshold SOC and/or when the temperature of the battery 11 is equal to or higher than the threshold temperature X1, the battery control unit 13 stops the temperature increasing function. That is, the battery control unit 13 stops supplying current to the heater 12.
  • the temperature increase function is stopped when the SOC of the battery 11 is equal to or higher than the threshold SOC.
  • the temperature raising function is stopped, the current flowing through the battery 11 substantially matches the current represented by the current command value. Therefore, the battery control unit 13 can realize accurate full charge determination using the current command value.
  • the battery control unit 13 may determine whether to use the temperature increase function based on the voltage of the battery 11. That is, when the SOC or voltage of the battery 11 is lower than a predetermined threshold level, the battery control unit 13 controls the heater 12 according to the comparison between the temperature of the battery 11 and the threshold temperature X1.
  • the battery control unit 13 may preferentially increase the temperature of the battery 11 over charging the battery 11 when the SOC of the battery 11 is equal to or higher than the threshold SOC. For example, in the embodiment shown in FIG. 5, when the temperature of the battery 11 falls below the threshold temperature X1 when the SOC of the battery 11 is equal to or higher than the threshold SOC, the battery control unit 13 executes S11 to S13. That is, the battery control unit 13 causes the heater 12 to generate heat while the charging operation is stopped. Then, when the temperature of the battery 11 becomes equal to or higher than the threshold temperature X1, the battery control unit 13 restarts the charging operation in S14, and stops the heater 12 in S7.
  • the battery control unit 13 may charge the battery 11 while controlling the temperature according to the procedure shown in FIG.
  • the heater 12 if the temperature of the battery 11 is low at the start of charging, the heater 12 is used to warm the battery 11 before actually charging. After that, the heater 12 is stopped and charging is performed. At this time, it is preferable that the temperature of the battery 11 is maintained at the threshold temperature X1 or higher until the battery is fully charged with the heater 12 stopped. However, if the outside temperature is high, the temperature of the battery 11 is less likely to drop during charging, but when the outside temperature is low, the temperature of the battery 11 is more likely to drop during charging. Therefore, the battery control unit 13 takes the outside temperature into consideration and determines to what extent the battery 11 should be warmed before starting charging.
  • FIGS. 6A to 7B are diagrams illustrating temperature control according to variations of the embodiment of the present disclosure.
  • X1 corresponds to the threshold temperature of the embodiment shown in FIGS. 4-5. That is, when the temperature of the battery 11 is lower than X1, charging efficiency is poor.
  • the temperature of the battery 11 is lower than X1 when the instruction to start charging is given (ie, time T11).
  • the battery control unit 13 warms the battery 11 using the heater 12 before starting charging. As a result, the temperature of the battery 11 rises to X2 as shown in FIG. 6A or FIG. 7A. Thereafter, the battery control unit 13 stops the heater 12 and starts charging the battery 11.
  • the temperature of the battery 11 gradually decreases.
  • the rate at which the temperature of the battery 11 decreases depends on the outside temperature. Specifically, as shown in FIG. 6A, when the outside temperature is high, the temperature of the battery 11 decreases slowly, but when the outside temperature is low, the temperature of the battery 11 decreases quickly. Furthermore, in the case shown in FIG. 6A, it is assumed that the battery 11 becomes fully charged at time T12. The time it takes for the battery 11 to reach a fully charged state depends on the SOC of the battery 11 at the time of starting charging.
  • the temperature of the battery 11 When the outside temperature is high, the temperature of the battery 11 remains at or above X1 at time T12 (that is, when the battery 11 is fully charged). That is, the temperature of the battery 11 is equal to or higher than X1 throughout the charging period. In this case, charging efficiency is good.
  • the outside temperature when the outside temperature is low, the temperature of the battery 11 is lower than X1 at time T12. That is, the temperature of the battery 11 is lower than X1 during part of the charging period. In this case, charging efficiency deteriorates.
  • This problem can be solved by setting the temperature of the battery 11 at the start of charging according to the outside temperature. Specifically, when the outside temperature is high, there is no need to increase the temperature of the battery 11 so much at the start of charging. On the other hand, when the outside temperature is low, it is necessary to sufficiently raise the temperature of the battery 11 when starting charging.
  • the temperature of the battery 11 at the start of charging may be set so that the temperature of the battery 11 does not become lower than X1 at the time when the battery 11 is expected to reach a fully charged state.
  • the outside temperature when the outside temperature is high, if the temperature of the battery 11 is set to X21 or higher at the start of charging, the temperature of the battery 11 will be higher than X1 throughout the charging period.
  • the outside temperature when the outside temperature is low, if the temperature of the battery 11 is set to X22 or higher at the start of charging, the temperature of the battery 11 will be higher than X1 throughout the charging period.
  • the charging time required to bring the battery 11 to a fully charged state depends on the SOC at the time of starting charging. Specifically, the larger the SOC at the start of charging, the shorter the charging time, and the smaller the SOC at the start of charging, the longer the charging time.
  • the charging end time in the case where the SOC at the start of charging is large is T13
  • the charging end time in the case where the SOC at the start of charging is small is T14.
  • the temperature of the battery 11 is raised to X2 at the start of charging.
  • the SOC at the start of charging is large, the temperature of the battery 11 remains equal to or higher than X1 when the battery 11 becomes fully charged at time T13. That is, since the temperature of the battery 11 is equal to or higher than X1 throughout the charging period, charging efficiency is good.
  • the SOC at the start of charging is small, the temperature of the battery 11 is lower than X1 when the battery 11 becomes fully charged at time T14. That is, the temperature of the battery 11 becomes lower than X1 during a part of the charging period, resulting in poor charging efficiency.
  • the charging start target temperature is set so that the temperature at the end of charging is equal to or higher than X1.
  • the SOC at the start of charging is large, if the temperature of the battery 11 is set at X23 or higher at the start of charging, the temperature of the battery 11 becomes X1 or higher throughout the charging period.
  • the SOC at the start of charging is small, if the temperature of the battery 11 is set to X24 or higher at the start of charging, the temperature of the battery 11 will be equal to or higher than X1 during the entire charging period.
  • the charging start target temperature is set based on the outside temperature and the SOC of the battery 11 at the time of starting charging.
  • the battery control unit 13 includes a charging start target temperature table shown in FIG.
  • charge start target temperatures are recorded for combinations of "temperature difference between threshold temperature ing. As described with reference to FIGS. 6A to 7B, the charging start target temperature decreases as the outside temperature increases, and also decreases as the SOC increases. It is assumed that the charging start target temperature is determined in advance by measurement or simulation. Note that the threshold temperature X1 is a fixed value for the battery 11, so “outside temperature” may be used instead of "the temperature difference between the threshold temperature X1 at which the charging efficiency of the battery 11 begins to decrease and the outside air temperature.” . That is, a charging start target temperature table may be created for a combination of "outside temperature” and "SOC at the time of charging start”.
  • FIG. 9 is a flowchart illustrating an example of charging control and temperature control by the battery system according to a variation of the embodiment of the present disclosure. Similar to the procedure shown in FIG. 4 or 5, when the user gives an instruction to start charging, the battery control unit 13 starts charging control and temperature control.
  • the battery control unit 13 detects the temperature of the battery 11 using the output signal of the temperature sensor T1.
  • the battery control unit 13 detects the outside temperature using the output signal of the temperature sensor T2.
  • the battery control unit 13 acquires the SOC of the battery 11. Note that the current SOC value is recorded, for example, in a memory (not shown). In this case, the battery control unit 13 acquires the current SOC value from the memory. Alternatively, the battery control unit 13 may estimate the SOC based on the OCV of the battery 11.
  • the battery control unit 13 obtains a charging start target temperature corresponding to the outside air temperature detected in S22 and the SOC obtained in S23.
  • the charge start target temperature can be obtained from the charge start target temperature table shown in FIG.
  • the battery control unit 13 may calculate the charging start target temperature by applying the outside temperature and SOC to a calculation formula prepared in advance.
  • the battery control unit 13 compares the temperature of the battery 11 detected in S21 with the charging start target temperature. Then, when the temperature of the battery 11 is equal to or higher than the charging start target temperature, the process of the battery control unit 13 proceeds to S29. On the other hand, when the temperature of the battery 11 is lower than the charging start target temperature, the battery control unit 13 causes the heater 12 to generate heat in S26. As a result, the temperature of the battery 11 increases. Thereafter, the battery control unit 13 monitors the temperature of the battery 11 in S27. Then, when the temperature of the battery 11 becomes equal to or higher than the charging start target temperature, the battery control unit 13 stops the heater 12 in S28.
  • the temperature of the battery 11 during charging when the outside temperature is sufficiently high does not decrease or decreases slowly even if the heater 12 is stopped. Therefore, when the outside temperature is sufficiently high, it is not necessarily necessary to use the heater 12 even if the temperature of the battery 11 at the time of starting charging is below the charging start target temperature. That is, the battery control unit 13 may cause the heater 12 to generate heat in S25 to S26 only when the temperature of the battery 11 is lower than the charging start target temperature and the outside temperature is lower than a predetermined threshold value.
  • the battery control unit 13 charges the battery 11.
  • the charging method is not particularly limited, but may be the CCCV method described with reference to FIGS. 2 and 3. Then, when the current command value (or the current supplied from the charger 20 to the battery system 10) decreases to a predetermined charging end current, the battery control unit 13 determines that the battery 11 is in a fully charged state and starts charging. end.
  • the process of S29 is executed when it is determined in S25 that the temperature of the battery 11 is equal to or higher than the charging start target temperature. Further, when it is determined in S25 that the temperature of the battery 11 is lower than the charge start target temperature, S29 is executed after the temperature of the battery 11 is warmed to the charge start target temperature or higher in S26 and S27. That is, in either case, the temperature of the battery 11 is equal to or higher than the charging start target temperature at the time when the battery control unit 13 executes charging of the battery 11.
  • the heater 12 is stopped. Therefore, the temperature of the battery 11 gradually decreases during charging.
  • the temperature of the battery 11 at the time when charging is actually performed is equal to or higher than the charging start target temperature.
  • the charging start target temperature is determined according to the outside temperature and the SOC at the time of charging start so that the temperature of the battery 11 at the end of charging is equal to or higher than a threshold temperature X1 at which charging efficiency starts to decrease. Therefore, the temperature of the battery 11 is maintained in a region with good charging efficiency throughout the charging period. In other words, efficient charging is realized.
  • the heater 12 since the heater 12 is stopped during charging, the charging current flowing through the battery 11 substantially matches the current represented by the current command value. Therefore, when determining full charge using the current command value, the determination accuracy is good.

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  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Electromagnetism (AREA)
  • Automation & Control Theory (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Physics & Mathematics (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

L'invention concerne un système de batterie (10) comprenant: une batterie (11), un capteur de température (T1) qui est configuré pour détecter la température de la batterie; un dispositif de chauffage (12) qui est configuré pour chauffer la batterie; et une unité de commande de batterie (13). L'unité de commande de batterie est configurée pour détecter l'état de la batterie et commander une opération pour charger la batterie et une opération pour élever la température de la batterie au moyen du dispositif de chauffage. L'unité de commande de batterie est en outre configurée pour commander le dispositif de chauffage en fonction d'une comparaison entre la température de la batterie et une température de seuil prédéfinie et, lorsque le régime de charge ou la tension de la batterie est supérieur(e) au niveau de seuil, pour surveiller si la batterie a atteint un état complètement chargé dans un état dans lequel le dispositif de chauffage a été arrêté.
PCT/JP2023/020792 2022-06-09 2023-06-05 Système de batterie et procédé de charge pour batterie WO2023238817A1 (fr)

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JP2022093690A JP2023180402A (ja) 2022-06-09 2022-06-09 バッテリシステム
JP2022-093690 2022-06-09

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WO2023238817A1 true WO2023238817A1 (fr) 2023-12-14

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JP (1) JP2023180402A (fr)
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015225782A (ja) * 2014-05-28 2015-12-14 トヨタ自動車株式会社 蓄電システム
JP2021141775A (ja) * 2020-03-09 2021-09-16 トヨタ自動車株式会社 車載バッテリ充電システム

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015225782A (ja) * 2014-05-28 2015-12-14 トヨタ自動車株式会社 蓄電システム
JP2021141775A (ja) * 2020-03-09 2021-09-16 トヨタ自動車株式会社 車載バッテリ充電システム

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