WO2016178308A1 - 二次電池の充電率算出装置、及び蓄電池システム - Google Patents

二次電池の充電率算出装置、及び蓄電池システム Download PDF

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WO2016178308A1
WO2016178308A1 PCT/JP2016/002163 JP2016002163W WO2016178308A1 WO 2016178308 A1 WO2016178308 A1 WO 2016178308A1 JP 2016002163 W JP2016002163 W JP 2016002163W WO 2016178308 A1 WO2016178308 A1 WO 2016178308A1
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Prior art keywords
charge
charging rate
secondary battery
charging
rate
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Ceased
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PCT/JP2016/002163
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English (en)
French (fr)
Japanese (ja)
Inventor
欣之介 板橋
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Marelli Corp
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Calsonic Kansei Corp
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Priority to US15/570,896 priority Critical patent/US20180292462A1/en
Publication of WO2016178308A1 publication Critical patent/WO2016178308A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644—Constructional arrangements
    • G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • 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
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M14/00—Electrochemical current or voltage generators not provided for in groups H01M6/00 - H01M12/00; Manufacture thereof
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/0071—Regulation of charging or discharging current or voltage with a programmable schedule
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3828—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • 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
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a charging rate calculation device and a storage battery system that calculate the charging rate of a secondary battery used in, for example, a hybrid vehicle.
  • a method for estimating the charging rate using a current integration method (Coulomb count method) or an open-circuit voltage estimation method (sequential parameter method) is known (for example, Patent Document 1).
  • the current integration method the charge / discharge current of the secondary battery is detected in time series and the current is integrated to estimate the current integration method charging rate (ASOC: Absolute State State of Charge).
  • ASOC Absolute State State of Charge
  • the open-circuit voltage method charging rate (RSOC: Relative State of Charge) is estimated by estimating the open-circuit voltage of the battery using an equivalent circuit model of the battery.
  • V the measurement terminal voltage
  • I the measured charge / discharge current
  • R the estimated internal resistance of the battery.
  • the charge / discharge current I is relatively large, such as charging with a large current
  • the error contributes to the estimated internal resistance R, so there is room for improvement in the estimation accuracy of the open-circuit voltage value and the charging rate.
  • An object of the present invention made in view of such circumstances is to provide a charging rate calculation device and a storage battery system that improve the estimation accuracy of the charging rate of a secondary battery.
  • a charging rate calculation apparatus provides: A charge / discharge current detector for detecting a charge / discharge current value of the secondary battery; A terminal voltage detector for detecting a terminal voltage value of the secondary battery; A first estimation unit that accumulates the charge / discharge current values and estimates a first charging rate; A second estimation unit that estimates a second charging rate based on a relationship between an open-circuit voltage value of the secondary battery and a charging rate; A charge rate calculation unit for calculating a third charge rate based on the first charge rate and the second charge rate each weighted based on the charge / discharge current value; It is characterized by providing.
  • the charging rate calculation apparatus is:
  • the charging rate calculation unit is configured based on the first charging rate and the second charging rate that are respectively weighted according to a charging / discharging rate obtained by dividing the charging / discharging current value by a battery capacity of the secondary battery. It is preferable to calculate the charging rate.
  • the charging rate calculation apparatus is: It is preferable that the higher the charge / discharge rate is, the smaller the weighting for the second charge rate is.
  • the charging rate calculation apparatus is: The second estimation unit further estimates a full charge capacity of the secondary battery, The charging rate calculation unit preferably calculates a charge / discharge rate using the estimated full charge capacity as the battery capacity.
  • the storage battery system is: Lead acid battery, A secondary battery other than the lead storage battery, having a voltage value substantially equal to the voltage value of the lead storage battery and connected in parallel with the lead storage battery, A charge rate calculation device for calculating a charge rate of the secondary battery,
  • the charging rate calculation device includes: A charge / discharge current detector for detecting a charge / discharge current value of the secondary battery; A terminal voltage detector for detecting a terminal voltage value of the secondary battery; A first estimation unit that accumulates the charge / discharge current values and estimates a first charging rate; A second estimation unit that estimates a second charging rate based on a relationship between an open-circuit voltage value of the secondary battery and a charging rate; A charge rate calculation unit that calculates a third charge rate based on the first charge rate and the second charge rate, each weighted based on the charge / discharge current value.
  • the first weighting coefficient ⁇ and the second weighting coefficient ⁇ are based on the charge / discharge current value i (k) of the first secondary battery. It is determined. Then, the final third charging rate SOC3 (k) is calculated based on the weighted first charging rate ⁇ SOC1 (k) and the weighted second charging rate ⁇ SOC2 (k). As described above, the estimation accuracy of the second charging rate SOC2 (k) using the open-circuit voltage estimation method varies depending on the charge / discharge current value i (k). Therefore, the estimation accuracy of the charging rate of the first secondary battery is improved by performing the weighting based on the charging / discharging current value i (k) as described above.
  • the charge / discharge current value i (k) is divided by the battery capacity (design capacity DC or full charge capacity FCC (k)) of the first secondary battery. Weighting is performed according to the charged / discharge rate C (k). Therefore, for example, in the plurality of storage battery systems 10 each using the same type of secondary battery having different battery capacities as the first secondary battery, the first lookup table and the second lookup table can be shared, and the development cost can be shared. Is reduced.
  • the second charging rate SOC2 (k) multiplied by the second charging rate SOC2 (k) as the charging / discharging current value i (k) or the charging / discharging rate C (k) increases.
  • the weight coefficient ⁇ is determined to be small. For this reason, when the charge / discharge current value i (k) is relatively large, the contribution of the second charging rate SOC2 (k), which decreases the estimation accuracy as described above, becomes small. The estimation accuracy of the charging rate is further improved.
  • the charge / discharge rate C (k) is calculated using the estimated full charge capacity FCC (k) as the battery capacity. For this reason, compared with the case where design capacity DC is used, the estimation precision of charging / discharging rate C (k) improves, and the estimation precision of the charging rate of a 1st secondary battery further improves.
  • the first weighting factor ⁇ and the second weighting factor ⁇ are determined based on the charge / discharge current value i (k) of the first secondary battery.
  • the final third charging rate SOC3 (k) is calculated based on the weighted first charging rate ⁇ SOC1 (k) and the weighted second charging rate ⁇ SOC2 (k).
  • the estimation accuracy of the second charging rate SOC2 (k) using the open-circuit voltage estimation method varies depending on the charge / discharge current value i (k). Therefore, the estimation accuracy of the charging rate of the first secondary battery is improved by performing the weighting based on the charging / discharging current value i (k) as described above.
  • FIG. 1 It is a block diagram which shows schematic structure of the storage battery system which concerns on Embodiment 1 of this invention. It is a block diagram which shows schematic structure of the charging rate calculation apparatus of FIG. It is a block diagram which shows schematic structure of the charging rate calculation part of FIG. It is a figure which shows the relationship between the electric current or charging / discharging rate in a 1st look-up table, and a coefficient. It is a figure which shows the relationship between the electric current or charging / discharging rate in a 2nd look-up table, and a coefficient.
  • the storage battery system 10 is mounted on a vehicle such as a hybrid vehicle (HEV vehicle).
  • a vehicle such as a hybrid vehicle (HEV vehicle).
  • HEV vehicle hybrid vehicle
  • the storage battery system 10 includes an alternator 12, a starter 13, a first secondary battery 14, a charge rate calculation device 15, a second secondary battery 16, a load 17, a first switch 18, 2 switch 19, third switch 20, and control unit 21.
  • the alternator 12, the starter 13, the first secondary battery 14, the second secondary battery 16, and the load 17 are connected in parallel.
  • the alternator 12 is a generator and is mechanically connected to a vehicle engine.
  • the alternator 12 can generate electric power by driving the engine.
  • the power generated by the alternator 12 by driving the engine can be supplied to the first secondary battery 14, the second secondary battery 16, the load 17, and the vehicle auxiliary equipment by adjusting the output voltage with a regulator.
  • the alternator 12 can generate power by regeneration when the vehicle is decelerated.
  • the electric power regenerated by the alternator 12 can be used to charge the first secondary battery 14 and the second secondary battery 16.
  • the starter 13 includes a cell motor, for example, and receives power supply from at least one of the first secondary battery 14 and the second secondary battery 16 to start the engine of the vehicle.
  • the first secondary battery 14 is a secondary battery other than a lead storage battery, such as a lithium ion battery or a nickel metal hydride battery.
  • the output voltage of the first secondary battery 14 is substantially the same as the output voltage of the second secondary battery 16 and is, for example, 12V.
  • the output voltage of the first secondary battery 14 may be different from the output voltage of the second secondary battery 16.
  • the output voltage of the first secondary battery 14 is adjusted by the DC / DC converter so as to be substantially the same as the output voltage of the second secondary battery 16.
  • the first secondary battery 14 can supply electric power to the auxiliary machine including the starter 13, the load 17, the ECU, and the like while the engine drive is stopped (when idling is stopped).
  • the charging rate calculation device 15 calculates the charging rate of the first secondary battery 14. Details of the charging rate calculation device 15 will be described later.
  • the second secondary battery 16 is a lead storage battery having an output voltage of a nominal voltage of 12 V, for example, and can supply power to the load 17.
  • the load 17 is a load including an audio, an air conditioner, a navigation system, and the like provided in the vehicle, for example, and operates by consuming the supplied power.
  • the load 17 operates by receiving power supply from the first secondary battery 14 and the second secondary battery 16 while the engine drive is stopped, and the alternator 12 and the first secondary battery 14 while the engine is driven. And the power supply from the second secondary battery 16 operates.
  • the first switch 18 is a switch connected in series with the starter 13.
  • the first switch 18 connects or disconnects the starter 13 in parallel with other components.
  • the second switch 19 is a switch connected in series with the first secondary battery 14.
  • the second switch 19 connects or disconnects the first secondary battery 14 in parallel with other components.
  • the third switch 20 is a switch connected in series with the second secondary battery 16 and the load 17.
  • the third switch 20 connects or disconnects the second secondary battery 16 and the load 17 in parallel with other components.
  • the control unit 21 includes, for example, an ECU provided in the vehicle, and controls the entire operation of the storage battery system 10. For example, the control unit 21 controls the operations of the first switch 18, the second switch 19, and the third switch 20, respectively, and the alternator 12, the first secondary battery 14, and the second secondary battery. Power supply by 16 and charging of the first secondary battery 14 and the second secondary battery 16 are performed.
  • the charging rate calculation device 15 includes a charge / discharge current detection unit 22, a terminal voltage detection unit 23, a current integration method estimation unit (first estimation unit) 24, and an open-circuit voltage method estimation unit (second estimation unit) 25. And a charging rate calculation unit 26 and a delay element 27.
  • the charge / discharge current detection unit 22 includes, for example, a shunt resistor and detects the charge / discharge current value i (k) of the first secondary battery 14.
  • k indicates time in discrete time.
  • the charge / discharge current value i (k) is the absolute value of the charge / discharge current.
  • the detected charge / discharge current value i (k) is input as an input signal to the current integration method estimation unit 24, the open-circuit voltage method estimation unit 25, and the charge rate calculation unit 26, respectively.
  • the charging / discharging current detection unit 22 is not limited to the above-described configuration, and those having various structures and formats can be appropriately employed.
  • the terminal voltage detector 23 detects the terminal voltage value v (k) of the first secondary battery 14.
  • the detected terminal voltage value v (k) is input as an input signal to the current integration method estimation unit 24 and the open-circuit voltage method estimation unit 25, respectively.
  • the terminal voltage detection unit 23 those having various structures and formats can be appropriately adopted.
  • the charging rate corresponding to the terminal voltage value v (0) regarded as OCV (0) is estimated as the first charging rate SOC1 (0).
  • the first charging rate SOC1 (0) is input to the charging rate calculation unit 26 as an input signal.
  • the current integration method estimation unit 24 inputs from the charge / discharge current detection unit 22 to the previous value SOC3 (k ⁇ 1) of the third charging rate input from the delay element 27 as described later.
  • a value obtained by adding the charged and discharged current values i (k) is estimated as the first charging rate SOC1 (k).
  • the estimated first charging rate SOC1 (k) is input to the charging rate calculation unit 26 as an input signal.
  • the open-circuit voltage method estimation unit 25 estimates the open-circuit voltage method charging rate (second charging rate) SOC2 (k). Specifically, first, the open-circuit voltage method estimation unit 25 is based on the charge / discharge current value i (k) and the terminal voltage value v (k) input from the charge / discharge current detection unit 22 and the terminal voltage detection unit 23, respectively. For example, each parameter in the equivalent circuit model of the first secondary battery 14 such as a Foster type RC ladder circuit or a Cowell type RC ladder circuit is estimated.
  • the open-circuit voltage method estimation unit 25 uses an adaptive filter such as a Kalman filter or a least-squares method, and the like, the capacitance value C (k) of the capacitor, the internal resistance value R (k), and the open-circuit voltage value OCV (k). Is estimated.
  • the open-circuit voltage method estimation unit 25 uses an OCV-SOC look-up table that shows a relationship between the open-circuit voltage and the charging rate of the first secondary battery 14 obtained in advance by experiment or simulation, and uses the open-circuit voltage value OCV.
  • the charging rate corresponding to the value of (k) is estimated as the second charging rate SOC2 (k).
  • the estimated second charging rate SOC2 (k) is input to the charging rate calculation unit 26 as an input signal.
  • the open circuit voltage method estimation unit 25 further estimates the soundness SOH (k) based on the relationship between the internal resistance of the first secondary battery 14 and the soundness (SOH: State of Health). Specifically, the open-circuit voltage method estimation unit 25 uses an R-SOH look-up table that shows a relationship between the internal resistance and the soundness level of the first secondary battery 14 obtained in advance by experiment or simulation.
  • the soundness level corresponding to the internal resistance value R (k) is estimated as the soundness level SOH (k).
  • the soundness level SOH (k) is a parameter indicating the degree of deterioration of the battery.
  • the charge rate calculator 26 uses the first charge rate ⁇ SOC1 (k) and the second weight weighted using the first weighting factor ⁇ and the second weighting factor ⁇ based on the charge / discharge current value i (k), respectively. Based on the charging rate ⁇ SOC2 (k), a third charging rate SOC3 (k) is calculated. Preferably, the charging rate calculation unit 26 calculates the first weighting coefficient ⁇ and the second weighting coefficient ⁇ based on the charge / discharge current value i (k) and the battery capacity (design capacity DC or full charge capacity FCC (k)). Based on the weighted first charging rate ⁇ SOC1 (k) and second charging rate ⁇ SOC2 (k), the third charging rate SOC3 (k) is calculated. In the present embodiment, the third charging rate SOC3 (k) is determined as the charging rate of the first secondary battery 14 at time k. Details of the charging rate calculation unit 26 will be described later.
  • the delay element 27 inputs the previous value SOC3 (k ⁇ 1) of the third charging rate to the current integrating method estimating unit 24. .
  • the charging rate calculation unit 26 includes a first coefficient determination unit 28, a second coefficient determination unit 29, a first multiplier 30, a second multiplier 31, and an adder 32.
  • the first coefficient determination unit 28 determines a first weighting coefficient ⁇ to be multiplied by the first charging rate SOC1 (k) based on the charge / discharge current value i (k). Specifically, the first coefficient determination unit 28 calculates a coefficient corresponding to the charge / discharge current value i (k) using a predetermined first look-up table indicating the relationship between the current and the coefficient. The first weighting factor ⁇ is set. Preferably, the first coefficient determination unit 28, according to the charge / discharge rate C (k) obtained by dividing the charge / discharge current value i (k) by the battery capacity (design capacity DC or full charge capacity FCC (k)), A first weighting factor ⁇ is determined.
  • the first coefficient determination unit 28 uses the first look-up table that indicates the relationship between the charge / discharge rate and the coefficient to determine the coefficient corresponding to the charge / discharge rate C (k).
  • the weight coefficient ⁇ is set to 1. Details of the first lookup table will be described later.
  • the design capacity DC may be employed as the battery capacity, but it is desirable to employ the full charge capacity FCC (k).
  • the second coefficient determination unit 29 uses the second lookup table indicating the relationship between the charge / discharge rate and the coefficient, and sets the coefficient corresponding to the charge / discharge rate C (k). A weighting factor ⁇ of 2 is set.
  • FIG. 4 is a graph showing the relationship between the current or charge / discharge rate and the coefficient in the first lookup table.
  • the horizontal axis indicates the current or charge / discharge rate
  • the vertical axis indicates the coefficient.
  • the larger the current value or the charge / discharge rate the larger the value of the corresponding coefficient. That is, the larger the charging / discharging current value i (k) or the charging / discharging rate C (k), the larger the weight of the first charging rate SOC1 (k) estimated by the current integration method.
  • FIG. 5 is a graph showing the relationship between the current or charge / discharge rate and the coefficient in the second lookup table.
  • the horizontal axis indicates the current or charge / discharge rate
  • the vertical axis indicates the coefficient.
  • the larger the current value or the charge / discharge rate the smaller the value of the corresponding coefficient. That is, the larger the charging / discharging current value i (k) or the charging / discharging rate C (k), the smaller the weight of the second charging rate SOC2 (k) estimated by the open circuit voltage estimation method.
  • the first multiplier 30 shown in FIG. 3 calculates a weighted first charging rate ⁇ SOC1 (k) by multiplying the first charging rate SOC1 (k) by the determined first weighting factor ⁇ . To do.
  • the second multiplier 31 multiplies the second charging rate SOC2 (k) by the determined second weighting coefficient ⁇ to calculate a weighted second charging rate ⁇ SOC2 (k).
  • the adder 32 calculates the sum of the weighted first charging rate ⁇ SOC1 (k) and the weighted second charging rate ⁇ SOC2 (k), and adds the sum to the third charging rate SOC3 (k). Determine.
  • the charging rate calculation device 15 based on the charge / discharge current value i (k) of the first secondary battery 14, the first weighting factor ⁇ and the A weighting factor ⁇ of 2 is determined. Then, the final third charging rate SOC3 (k) is calculated based on the weighted first charging rate ⁇ SOC1 (k) and the weighted second charging rate ⁇ SOC2 (k). As described above, the estimation accuracy of the second charging rate SOC2 (k) using the open-circuit voltage estimation method varies depending on the charge / discharge current value i (k). Therefore, the estimation accuracy of the charging rate of the first secondary battery 14 is improved by performing the weighting based on the charge / discharge current value i (k) as described above.
  • the charging rate calculation device 15 the charge / discharge rate C obtained by dividing the charge / discharge current value i (k) by the battery capacity (design capacity DC or full charge capacity FCC (k)) of the first secondary battery 14. Weighting is performed according to (k). For this reason, for example, in the plurality of storage battery systems 10 each using the same type of secondary battery having different battery capacities as the first secondary battery 14, the first lookup table and the second lookup table can be shared and developed. Cost is reduced.
  • the charge rate calculation device 15 calculates the charge / discharge rate C (k) using the estimated full charge capacity FCC (k) as the battery capacity. For this reason, compared with the case where design capacity DC is used, the estimation precision of charging / discharging rate C (k) improves, and the estimation precision of the charging rate of the 1st secondary battery 14 further improves.
  • the storage battery system 10 mounted on the hybrid vehicle has been described, but the present invention is not limited to this.
  • the storage battery system 10 may be mounted on an electric vehicle (EV vehicle).
  • EV vehicle electric vehicle
  • the storage battery system 10 has been described with respect to the configuration including the first secondary battery such as a lithium ion battery and the second secondary battery that is a lead storage battery, but is not limited thereto.
  • the storage battery system 10 may further include another secondary battery having a battery capacity different from that of the first secondary battery or the second secondary battery.

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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Tests Of Electric Status Of Batteries (AREA)
PCT/JP2016/002163 2015-05-01 2016-04-22 二次電池の充電率算出装置、及び蓄電池システム Ceased WO2016178308A1 (ja)

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JP6776904B2 (ja) * 2017-01-13 2020-10-28 株式会社デンソー 電池パック及び電源システム
EP3447876A1 (de) * 2017-08-23 2019-02-27 Hilti Aktiengesellschaft Ermitteln der ladung eines akkumulators bei einem ladevorgang
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