WO2019116815A1 - Dispositif de surveillance d'élément secondaire, dispositif de calcul d'état d'élément secondaire, et procédé d'estimation d'état d'élément secondaire - Google Patents

Dispositif de surveillance d'élément secondaire, dispositif de calcul d'état d'élément secondaire, et procédé d'estimation d'état d'élément secondaire Download PDF

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Publication number
WO2019116815A1
WO2019116815A1 PCT/JP2018/042226 JP2018042226W WO2019116815A1 WO 2019116815 A1 WO2019116815 A1 WO 2019116815A1 JP 2018042226 W JP2018042226 W JP 2018042226W WO 2019116815 A1 WO2019116815 A1 WO 2019116815A1
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Prior art keywords
temperature
internal resistance
battery
secondary battery
unit
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PCT/JP2018/042226
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English (en)
Japanese (ja)
Inventor
直行 五十嵐
亮平 中尾
大川　圭一朗
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日立オートモティブシステムズ株式会社
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Priority to JP2019558982A priority Critical patent/JP6895541B2/ja
Publication of WO2019116815A1 publication Critical patent/WO2019116815A1/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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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]
    • 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
    • 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
    • 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 secondary battery monitoring device, a secondary battery state calculation device, and a secondary battery state estimation method.
  • the state of the secondary battery is the internal resistance of the secondary battery, the state of charge (SOC: State of Charge) or the remaining capacity indicating how much the battery is charged or to which the amount of charge that can be discharged remains.
  • SOC State of Charge
  • SOH state of health
  • Patent Document 1 describes that temperature correction is performed based on internal resistance-temperature characteristic data of a secondary battery and a temperature measured by a temperature sensor.
  • Patent Document 1 does not take measures against the expansion of the error of the internal resistance of the secondary battery in the low temperature region, the error of the internal resistance in the low temperature region is expanded, and thus the accuracy of the state estimation of the secondary battery Even worse.
  • the secondary battery monitoring device includes a temperature measurement unit that measures the temperature of the secondary battery, and a secondary battery state computing device.
  • the secondary battery state computing device includes the temperature and the internal resistance of the secondary battery.
  • a temperature correction unit that derives a correction temperature T ⁇ by adding a temperature correction value ⁇ to the battery temperature T measured by the temperature measurement unit, and a temperature correction unit that is derived by the temperature correction unit State estimation for performing the state estimation of the secondary battery based on an internal resistance calculating unit that obtains the internal resistance corresponding to the correction temperature T ⁇ with reference to the storage unit, and the internal resistance obtained by the internal resistance calculating unit And a control unit.
  • the secondary battery state calculation device adds the temperature correction value ⁇ to the measured battery temperature T and stores the correction temperature T ⁇ by the storage unit that stores the correspondence between the temperature of the secondary battery and the internal resistance.
  • a temperature correction unit to be derived an internal resistance calculation unit to obtain the internal resistance corresponding to the correction temperature T ⁇ derived by the temperature correction unit with reference to the storage unit, and an internal calculation obtained by the internal resistance calculation unit
  • a state estimation control unit that estimates the state of the secondary battery based on a resistance.
  • the secondary battery state estimation method stores the correspondence between the temperature of the secondary battery and the internal resistance, adds the temperature correction value ⁇ to the measured battery temperature T, and derives the correction temperature T ⁇ .
  • the internal resistance corresponding to the derived correction temperature T ⁇ is determined with reference to the stored correspondence relationship between the temperature of the secondary battery and the internal resistance, and the state of the secondary battery based on the determined internal resistance Make an estimate.
  • the error of the internal resistance of the secondary battery in the low temperature range can be reduced, and the accuracy of the state estimation of the secondary battery can be improved.
  • FIG. 1 is a block diagram of a secondary battery monitoring device 1000 in the present embodiment.
  • the secondary battery monitoring device 1000 includes a battery 100, a measurement unit 200, a battery state calculation device 300, and an output unit 400.
  • the charge stored in the battery 100 is supplied as power to an external device, and an electric vehicle, a hybrid car, a train, or the like can be considered as a target for supplying power.
  • the battery state computing device 300 outputs the state of charge SOC of the battery 100, the degree of deterioration SOH, and the like to the output unit 400.
  • the battery 100 is, for example, a rechargeable battery such as a lithium ion secondary battery.
  • the present embodiment can be applied to a device having a power storage function such as a nickel hydrogen battery, a lead battery, and an electric double layer capacitor.
  • the battery 100 may be a single battery cell, or may be a module structure in which a plurality of single battery cells are combined.
  • the measurement unit 200 is a functional unit that measures physical characteristics of the battery 100, for example, voltage V across the battery 100, current (battery current) I flowing to the battery 100, battery temperature T of the battery 100, etc. It consists of sensors, necessary electrical circuits, etc. Although measurement means such as a thermistor, thermocouple or infrared ray are used to measure the battery temperature T, in any measurement means, the battery temperature as the measurement result includes the device-specific measurement error value ⁇ .
  • the battery state calculation device 300 is a device that estimates the state of the battery 100, and includes a battery state estimation device 310 and a storage unit 320.
  • internal resistance value R of the battery 100 is required for state estimation of the battery 100 so that it may mention later, in this embodiment, in the battery state estimation apparatus 310, internal resistance value R is used using other measurement parameters. calculate.
  • the battery state estimation device 310 stores the battery 100 stored in the storage unit 320 based on the voltage V across the battery 100 measured by the measurement unit 200, the battery current I flowing to the battery 100, and the battery temperature T of the battery 100.
  • the SOC and SOH of the battery 100 are calculated with reference to the characteristic information of Calculation of the internal resistance R of the battery 100 and calculation of the SOC and SOH will be described later.
  • the battery state estimation device 310 can be configured using hardware such as a circuit device that realizes the function.
  • software that implements the function can be configured by execution by an arithmetic device such as a central processing unit (CPU).
  • the software is stored, for example, in the storage unit 320.
  • the storage unit 320 stores characteristic information of the battery 100 that can be known in advance, such as the internal resistance R of the battery 100, the polarization voltage, the charging efficiency, the allowable current, and the battery capacity.
  • the correspondence between the battery temperature and the internal resistance is stored in the form of a correspondence table, a functional expression, or the like. Further, as described later, the correspondence between the battery temperature and the temperature correction value is stored.
  • the characteristic information may store values individually for charge and discharge operations, or may store values individually for each state of the battery 100, such as charge state and battery temperature.
  • the storage unit 320 is configured using a storage device such as a flash memory, an EEPROM (Electrically Erasable Programmable Read-Only Memory), a magnetic disk, or the like.
  • the storage unit 320 may be provided outside the battery state estimation device 310, or may be realized as a memory device provided inside the battery state estimation device 310.
  • the storage unit 320 may be removable. If removable, replacing the storage unit 320 allows the characteristic information and software to be easily changed. Further, the characteristic information and the software can be updated for each small unit by distributing and storing the characteristic information and the software in the replaceable storage unit 320 having a plurality of the memory units 320.
  • the output unit 400 is a functional unit that outputs the output of the battery state calculation device 300 to an external device (for example, a host device such as a vehicle control device provided in an electric vehicle).
  • an external device for example, a host device such as a vehicle control device provided in an electric vehicle.
  • FIG. 2 is a block diagram of a battery state calculation device 300 including the battery state estimation device 310 and the storage unit 320.
  • the battery state estimation device 310 includes a temperature correction unit 311, an internal resistance calculation unit 312, an SOC calculation unit 313, and an SOH calculation unit 314.
  • the temperature correction unit 311 adds the temperature correction value ⁇ to the battery temperature T measured by the measurement unit 200 when the temperature of the battery 100 is equal to or lower than the predetermined value, and sends the correction temperature T ⁇ to the internal resistance calculation unit 312. Output.
  • the temperature correction value ⁇ is a value within the range of the measurement error value ⁇ of the temperature measurement by the sensor of the measurement unit 200.
  • the measurement error value ⁇ is a unique value corresponding to the sensor used in the measurement unit 200, and is a value known in advance. The derivation of the optimal temperature correction value ⁇ will be described later.
  • temperature correction unit 311 When the temperature of battery 100 is not equal to or lower than the predetermined value, temperature correction unit 311 outputs battery temperature T measured by measurement unit 200 to internal resistance calculation unit 312 as it is.
  • the internal resistance calculation unit 312 corresponds the internal resistance corresponding to the corrected temperature T ⁇ determined by the temperature correction unit 311 to the temperature in the storage unit 320 and the internal resistance. Find by referring to the relationship. Further, when the temperature of battery 100 is not equal to or lower than a predetermined value, internal resistance calculation unit 312 sets the internal resistance corresponding to battery temperature T measured by measurement unit 200 to the internal resistance of temperature in storage unit 320 and the internal resistance. Determine by referring to the correspondence. The calculated internal resistance is output to SOC calculation unit 313 and SOH calculation unit 314.
  • temperature correction unit 311 and internal resistance calculation unit 312 convert the value of internal resistance with less error, as described later, so this value was used.
  • the calculation of the SOC calculation unit 313 and the SOH calculation unit 314 also reduces the error.
  • the SOC operation unit 313 obtains the SOC, but there are various methods for the method, and the first method will be described below.
  • the SOC calculation unit 313 receives the voltage V across the battery 100, the current (battery current) I flowing through the battery 100, the battery temperature T of the battery 100, and the like.
  • the SOC calculation unit 313 calculates and outputs an SOC based on the integrated value of the current based on the input current and the previous value (calculation result of one cycle earlier) of the SOC calculation result by the SOC calculation unit 313.
  • the SOC is calculated, for example, by the following equation (1).
  • SOCold is the previous value of SOC.
  • ⁇ SOC is a change amount of SOC due to the current I flowing from the previous calculation time to the current calculation time
  • Qmax is a full charge capacity of the battery 100
  • ts is a control cycle (sampling cycle such as current or voltage) It is.
  • SOC operation unit 313 integrates the discharge current from full charge based on equation (1), and the charge amount remaining in battery 100 with respect to the charge amount (total capacity) that can be charged to the maximum. The ratio of (remaining capacity) is calculated to determine the SOC.
  • battery 100 can be represented by a series connection of an impedance Z and a capacitance component C in parallel, an internal resistance R, and an open circuit voltage OCV.
  • a closed circuit voltage CCV which is a voltage between terminals of the battery 100 is expressed by the following equation (2).
  • Vp is a polarization voltage, which corresponds to the voltage across the parallel-connected pair of impedance Z and capacitance component C.
  • CCV OCV + I ⁇ R + Vp (2)
  • SOC operation unit 313 obtains open circuit voltage OCV by subtracting IR drop and polarization voltage Vp from closed circuit voltage CCV as in the following equation (3).
  • OCV CCV-I-R-Vp (3)
  • the internal resistance R and the polarization voltage Vp are stored in advance in the storage unit 120 as characteristic information of the battery 100. Since the internal resistance R and the polarization voltage Vp differ depending on the charge state of the battery 100, the battery temperature, and the like, individual values are stored in the storage unit 120 for each combination of these. In the present embodiment, the storage unit 120 is referred to using the internal resistance R obtained by the internal resistance calculation unit 312. Then, using the internal resistance R determined by the internal resistance calculation unit 312, an IR drop is determined.
  • the correspondence between the open circuit voltage OCV of the battery 100 and the SOC is determined by the characteristics of the battery 100, and in the storage unit 120, data defining the correspondence is stored in advance as an SOC table.
  • SOC operation unit 313 calculates open circuit voltage OCV using equation (3) described above, and uses this as a key to calculate the SOC of battery 100 by referring to the SOC table.
  • the current SOC can be obtained by the first method and the second method. Furthermore, the SOC may be determined by weighted addition to the SOC determined by these methods.
  • the SOH calculator 314 calculates SOH, for example, according to the following equation (4), based on the initial internal resistance value R0 corresponding to the SOC and the temperature, and the internal resistance value R at the present time.
  • the value of the internal resistance R determined by the internal resistance calculation unit 312 is used.
  • SOH 100 ⁇ R / R 0 (4)
  • the initial internal resistance value R0 is stored in advance in storage unit 320 corresponding to battery 100.
  • the SOH calculator 314 updates the calculation based on the equation (4) for each predetermined cycle such as a control cycle (sampling cycle of current, voltage or the like) and outputs it.
  • the SOC calculating part 313 and the SOH calculating part 314 show the typical example utilized in the secondary battery control apparatus in this embodiment, it is not restricted to these and another calculation is added. It may be other configurations.
  • FIG. 3 is a diagram showing the relationship between the battery temperature of the battery 100 and the internal resistance.
  • the horizontal axis represents temperature
  • the vertical axis represents internal resistance.
  • R THIGH the internal resistance
  • R TLOW the internal resistance
  • FIG. 4 is a diagram showing the relationship between the battery temperature and the internal resistance error, and shows the degree of influence of the measurement error of the battery temperature T on the calculation result of the internal resistance R.
  • the battery temperature T is a value measured by the measurement unit 200, but the measurement result includes the measurement error ⁇ .
  • the measurement error ⁇ by the measurement unit 200 is added, and the range is from T H1 to T H2 .
  • the possible range of the internal resistance R is R TH1 to R TH2 .
  • the measurement error ⁇ by the measurement unit 200 is added, and the range is from T L1 to T L2 .
  • the possible range of the internal resistance R is R TL1 to R TL2 .
  • FIG. 5 is a diagram showing the relationship between the battery temperature, the correction temperature, and the internal resistance error.
  • Figure 5 shows an example, and the internal R T resistor corresponding to the battery temperature T, and an internal resistance R T [alpha corresponding to the temperature T alpha performing the correction of adding temperature correction value alpha to the battery temperature T.
  • the battery temperature T measured by the measuring unit 200 includes a measurement error ⁇ . Therefore, the temperature range when considering the measurement error ⁇ is in the range of T 1 of the T 2. That is, the range of T 1 to T 2 is within the range of the measurement error ⁇ . At this time, although the original internal resistance is RT , the internal resistance calculated under the influence of the temperature measurement error is in the range from RT1 to RT2 .
  • the temperature correction unit 311 adds the temperature correction value ⁇ to the battery temperature T, and the added battery temperature is T ⁇ .
  • the temperature correction value ⁇ is a value within the range of the measurement error value ⁇ of the temperature measurement by the sensor of the measurement unit 200. At this time, although the internal resistance becomes R T [alpha, internal resistance calculated by the influence of the temperature measurement error in the range of R T [alpha] 1 of R T ⁇ 2.
  • the temperature correction value ⁇ a value that satisfies this condition is set.
  • Storage unit 320 stores the correspondence between temperature and internal resistance, and based on the correspondence between temperature and internal resistance, temperature correction value ⁇ for reducing the internal resistance error as described above is stored in advance. ing.
  • the temperature correction unit 311 reads the temperature correction value ⁇ , adds the temperature correction value ⁇ to the battery temperature T measured by the measurement unit 200, and outputs the correction temperature T ⁇ to the internal resistance calculation unit 312.
  • the temperature correction value ⁇ corrected by the temperature correction unit 311 will be described with reference to FIGS. 6 to 8.
  • the temperatures of the battery 100 are 25 ° C., 35 ° C., and 45 ° C.
  • the battery temperature T measured by the measuring unit 200 is 25 ° C., 35 ° C., and 45 ° C.
  • the graph shows the internal resistance error when the temperature correction value ⁇ is performed from 0 to 2.0 when the temperature includes the errors of 0 ° C., 1 ° C., 2 ° C., and 3 ° C., respectively.
  • FIG. 6 is a diagram showing the relationship between the temperature correction value ⁇ and the internal resistance error when the temperature of the battery 100 is 25 ° C.
  • the actual temperature T c of the battery 100 is 25 ° C.
  • the temperature T measured by the measuring unit 200 is T C + 3 ° C.
  • the temperature correction value ⁇ has a range in which the internal resistance error is minimized.
  • the broken line of the black triangle mark in FIG. 6 is a case where the temperature T measured by the measurement unit 200 is T C + 2 ° C., that is, a measurement error of 2 ° C. is included.
  • the broken line in the black square in FIG. 6 is a case where the temperature T measured by the measurement unit 200 is T C + 1 ° C., that is, a measurement error of 1 ° C. is included.
  • the broken line in the black rhombus in FIG. 6 is a case where the temperature T measured by the measurement unit 200 is T C ° C., that is, a measurement error of 0 ° C. is included. That is, it can be seen that the internal resistance error can be reduced by increasing the temperature correction value ⁇ as the measurement error increases.
  • FIG. 7 is a diagram showing the relationship between the temperature correction value ⁇ and the internal resistance error when the temperature of the battery 100 is 35 ° C.
  • the temperature correction value ⁇ is represented by a line graph of black circles. The internal resistance error is minimized when the temperature is set to 1.5.degree.
  • FIG. 8 is a diagram showing the relationship between the temperature correction value ⁇ and the internal resistance error when the temperature of the battery 100 is 45 ° C.
  • the internal resistance error is increased by performing the temperature correction. This is because, as described with reference to FIG. 4, the higher the battery temperature, the smaller the influence on the error of the internal resistance due to the temperature measurement error. Therefore, the effect of the expansion of the internal resistance error due to the temperature correction Because it is larger.
  • the temperature correction value ⁇ is 1 ° C.
  • the temperature correction value ⁇ is 1.
  • the temperature is 5 ° C.
  • the temperature correction value ⁇ is set to 0 ° C., or the temperature correction is not performed. Thereby, the reduction of the internal resistance error due to the temperature correction can be effectively used.
  • the storage unit 320 stores the correspondence between the battery temperature T and the temperature correction value ⁇ .
  • the temperature correction unit 311 refers to the correspondence between the battery temperature T and the temperature correction value ⁇ stored in the storage unit 320, and uses the temperature correction value ⁇ corresponding to the battery temperature T of the battery 100 measured by the measurement unit 200. Read out, the temperature correction value ⁇ is added to the battery temperature T, and the result is output to the internal resistance calculation unit 312.
  • the threshold of the temperature or the like exemplified in the present embodiment is not limited to that value, and an optimal value may be selected according to the characteristics of the device involved in the calculation, such as the characteristics of the battery 100 and the measurement error of the measuring unit 200. It shall be selected.
  • the internal resistance calculated by the internal resistance calculation unit 312 can be obtained.
  • the error can be reduced. Furthermore, the errors in the calculations of the SOC calculation unit 313 and the SOH calculation unit 314 using the internal resistance also decrease.
  • the secondary battery monitoring device 1000 includes a measurement unit 200 that measures the temperature of the battery 100, and a secondary battery state calculation device 300 that calculates the state of the battery 100.
  • the secondary battery state arithmetic unit 300 adds the temperature correction value ⁇ to the battery temperature T measured by the measurement unit 200 and the storage unit 320 that stores the correspondence between the temperature of the battery 100 and the internal resistance, and corrects the correction temperature T
  • a temperature correction unit 311 for deriving ⁇ an internal resistance calculation unit 312 for obtaining an internal resistance corresponding to the correction temperature T ⁇ derived by the temperature correction unit 311 with reference to the storage unit 320, and an internal resistance calculation unit 312
  • the SOC calculation unit 313 and the SOH calculation unit 314 that estimate the state of the battery 100 based on the calculated internal resistance are provided.
  • the SOC calculation unit 313 and the SOH calculation unit 314 are elements constituting the battery state estimation device 310. Thereby, the error of the internal resistance of the secondary battery in the low temperature range can be reduced, and the accuracy of the state estimation of the secondary battery can be improved.
  • the storage unit 320 stores the correspondence between the battery temperature T and the temperature correction value ⁇ , and the temperature correction unit 311 corresponds to the battery temperature T measured by the measurement unit 200.
  • the temperature correction value ⁇ to be calculated is determined with reference to the correspondence between the battery temperature T stored in the storage unit 320 and the temperature correction value ⁇ .
  • the battery temperature T can be associated with the temperature correction value ⁇ , the error in the internal resistance of the secondary battery in the low temperature range can be reduced, and the accuracy of the state estimation of the secondary battery can be improved.
  • the temperature correction unit 311 sets the battery temperature T measured by the measurement unit 200 and the resistance value RT corresponding to the battery temperature T calculated by the internal resistance calculation unit 312 as the temperature correction value ⁇ , and the battery temperature T
  • Two temperatures obtained by T ⁇ 1, T ⁇ 2 and the internal resistance calculator 312 A temperature correction value
  • the temperature correction value ⁇ is within the range of the temperature measurement error of the measurement unit 200. Therefore, the error of the internal resistance of the secondary battery in the low temperature range can be reduced within the range of the temperature measurement error of the measurement unit 200, and the accuracy of the state estimation of the secondary battery can be improved.
  • the secondary battery state computing device 300 includes the storage unit 320 that stores the correspondence between the temperature of the secondary battery and the internal resistance, and the battery state estimation device 310.
  • Battery state estimating unit 310 includes a temperature compensation unit 311 for deriving the correction temperature T alpha by adding the temperature correction value alpha to the measured battery temperature T, corresponding to the correction temperature T alpha derived by the temperature correction unit 311
  • An internal resistance calculating unit 312 for obtaining the internal resistance with reference to the storage unit; an SOC calculating unit 313 for estimating the state of the secondary battery based on the internal resistance obtained by the internal resistance calculating unit 312; Equipped with
  • the internal resistance calculation unit 312 measures the internal resistance corresponding to the measured battery temperature T, the temperature T of the secondary battery stored in the storage unit 320, and the internal resistance. Determine by referring to the correspondence of.
  • the secondary battery state estimation method stores the correspondence between the temperature of the battery 100 and the internal resistance, adds the temperature correction value ⁇ to the measured battery temperature T, and derives the correction temperature T ⁇ to derive the correction temperature T ⁇ .
  • the internal resistance corresponding to the corrected temperature T ⁇ is determined with reference to the stored correspondence relationship between the temperature of the battery 100 and the internal resistance, and the state of the battery 100 is estimated based on the determined internal resistance. Thereby, the error of the internal resistance of the secondary battery in the low temperature range can be reduced, and the accuracy of the state estimation of the secondary battery can be improved.
  • the internal resistance corresponding to the measured battery temperature T is a correspondence between the stored secondary battery temperature and the internal resistance. See and ask for.
  • the present invention can be implemented with the following modifications of the embodiment described above.
  • (1) The embodiment has been described using an example in which the temperature range for temperature correction and the temperature correction value ⁇ are predetermined and stored in the storage unit 320. However, these are not determined in advance, and the battery state estimation device 310 calculates the temperature correction value ⁇ which reduces the internal resistance error most while changing the temperature correction value ⁇ variously, and determines it in real time. It may be

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Abstract

Selon l'invention, si aucune mesure n'est prise contre des augmentations d'erreurs dans la résistance interne d'un élément secondaire dans une région à basse température, non seulement les erreurs dans la résistance interne augmenteront dans la région à basse température, mais également une précision d'estimation de l'état de l'élément secondaire se détériorera. Lorsque la température d'un élément 100 est égale ou inférieure à une valeur prescrite, une unité de correction de température 311 se réfère à une corrélation entre des températures d'élément T et des valeurs de correction de température α qui sont mémorisées dans une unité de mémorisation 320, lit une valeur de correction de température α qui correspond à la température d'élément T de l'élément 100 telle que mesurée par une unité de mesure 200, ajoute la valeur de correction de température α à la température d'élément T, et délivre en sortie le résultat à une unité de calcul de résistance interne 312.
PCT/JP2018/042226 2017-12-11 2018-11-15 Dispositif de surveillance d'élément secondaire, dispositif de calcul d'état d'élément secondaire, et procédé d'estimation d'état d'élément secondaire WO2019116815A1 (fr)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111366863A (zh) * 2020-03-13 2020-07-03 上海应用技术大学 一种基于低温循环的锂离子电池寿命加速预判方法
WO2021065231A1 (fr) * 2019-09-30 2021-04-08 株式会社デンソー Dispositif d'estimation d'état de batterie
JP6918433B1 (ja) * 2020-03-10 2021-08-11 三菱電機株式会社 劣化度診断装置
JP2023515658A (ja) * 2020-10-05 2023-04-13 エルジー エナジー ソリューション リミテッド バッテリー装置およびバッテリー出力予測方法
CN115993552A (zh) * 2023-03-23 2023-04-21 杭州科工电子科技有限公司 电池内阻估算方法

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