WO2021191939A1 - Dispositif de commande de batterie secondaire, bloc-batterie et procédé de commande de batterie secondaire - Google Patents

Dispositif de commande de batterie secondaire, bloc-batterie et procédé de commande de batterie secondaire Download PDF

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Publication number
WO2021191939A1
WO2021191939A1 PCT/JP2020/012590 JP2020012590W WO2021191939A1 WO 2021191939 A1 WO2021191939 A1 WO 2021191939A1 JP 2020012590 W JP2020012590 W JP 2020012590W WO 2021191939 A1 WO2021191939 A1 WO 2021191939A1
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Prior art keywords
secondary battery
peak
capacity
curve
point
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PCT/JP2020/012590
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English (en)
Japanese (ja)
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拳 中村
英司 遠藤
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Tdk株式会社
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Priority to PCT/JP2020/012590 priority Critical patent/WO2021191939A1/fr
Publication of WO2021191939A1 publication Critical patent/WO2021191939A1/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
    • 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 control device, a battery pack, and a secondary battery control method.
  • SOC State of Charge
  • SOH State of Health
  • SOC is an index showing the remaining capacity of the secondary battery
  • SOH is an index showing the deterioration state of the battery.
  • SOC is the ratio of the remaining capacity to the fully charged capacity.
  • SOH is the ratio of the capacity from full charge to full discharge at the time of deterioration to the capacity from initial full charge to full discharge.
  • Patent Document 1 describes the maximum of the V-dQ / dV curve obtained from dQ / dV, which is the ratio of the amount of change in the amount of stored electricity to the amount of change in the voltage, and the voltage V of the secondary battery when the secondary battery is charged.
  • a method of estimating the capacity reduction rate (corresponding to SOH) from the voltage value of the point is described.
  • Patent Document 2 describes a method of obtaining dQ / dV when the secondary battery is discharged and obtaining SOH from the maximum value of the amount of change in dQ / dV with respect to voltage.
  • the present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a control device for a secondary battery, a battery pack, and a control method for the secondary battery, which can correct the deteriorated state of the secondary battery to an appropriate value. do.
  • the secondary battery control device is a specific peak among a plurality of maximum points in a double differential curve obtained by differentiating the QV curve of the initial secondary battery by capacitance and voltage, respectively. Or the capacity between a point mathematically equivalent to this and a derived peak or a point mathematically equivalent to the derived peak that occurs in the vicinity of the specific peak as the secondary battery deteriorates in the double differential curve.
  • the specific peak may be a peak associated with the start point of the voltage stable region that appears third from the fully discharged state in the initial secondary battery. ..
  • the specific peak may be a peak generated in the range where the working voltage of the secondary battery is 3.8 V or more and 4.1 V or less.
  • the specific peak may be a peak that occurs in the range where the remaining capacity with respect to the full charge capacity is 40% or more and 70% or less.
  • the derived peak may occur on the lower capacity side than the specific peak.
  • the control device for the secondary battery according to the above embodiment has the specific peak and the derivative peak based on the detection means for monitoring the capacity and the voltage of the secondary battery and the detection result of the detection means.
  • the battery pack according to the second aspect includes a secondary battery and a control device for the secondary battery according to the above aspect.
  • the secondary battery may contain lithium nickel cobalt manganese composite oxide (NCM) and lithium manganese oxide (LMO) as active materials in the positive electrode.
  • NCM lithium nickel cobalt manganese composite oxide
  • LMO lithium manganese oxide
  • the method for controlling the secondary battery according to the third aspect is a specific peak among a plurality of maximum points in the double differential curve obtained by differentiating the QV curve of the initial secondary battery by capacity and voltage, respectively. Or the capacity between a point mathematically equivalent to this and a derived peak or a point mathematically equivalent to the derived peak that occurs in the vicinity of the specific peak as the secondary battery deteriorates in the double differential curve.
  • the difference is X and the constants obtained in advance from the relationship between the X in the calibration sample and the deterioration degree of the calibration sample are A and B
  • the secondary battery control device, the battery pack, and the secondary battery control method according to the above aspect can correct the deteriorated state of the secondary battery to an appropriate value. Further, the secondary battery control device, the battery pack, and the secondary battery control method according to the above aspect enhance the safety of the secondary battery, contribute to the stable supply of energy, and contribute to the sustainable development goal.
  • FIG. 1 is a block diagram of the battery pack 100 according to the first embodiment.
  • the battery pack 100 includes a secondary battery 10 and a control device 20. Signal communication is performed between the secondary battery 10 and the control device 20. The signal communication may be wired or wireless.
  • the secondary battery 10 is, for example, a lithium secondary battery. The specific configuration of the secondary battery 10 will be described later.
  • the secondary battery 10 deteriorates with use.
  • the index of deterioration of the secondary battery 10 is SOH.
  • SOH is represented by "capacity from full charge to full discharge at the time of deterioration (Ah) / capacity from initial full charge to full discharge (Ah) x 100". Appropriate evaluation of SOH leads to extension of battery life.
  • the control device 20 is a control device (controller) that controls the secondary battery 10.
  • the control device 20 is, for example, a microcomputer.
  • the control device 20 reads, for example, the capacity and voltage of the secondary battery 10 and outputs a correction value.
  • the control device 20 will be described with reference to a specific example of the control device 20.
  • the control device 20 has, for example, a detection means 21, a two-point capacity calculation means 22, and a correction means 23.
  • the detection means 21, the two-point capacity calculation means 22, and the correction means 23 are, for example, programs stored in the control device 20.
  • the detection means 21 monitors the voltage and capacity of the secondary battery 10.
  • the detecting means 21 draws a double differential curve of the secondary battery 10 based on the voltage and the capacity while monitoring the voltage and the capacity of the secondary battery 10, for example.
  • the second derivative curve is a curve obtained by differentiating the QV curve of the secondary battery with the capacitance and the voltage, respectively.
  • the second derivative curve of the secondary battery 10 is measured in real time in the process of using the secondary battery 10.
  • FIG. 2 shows the relationship between the QV curve of the secondary battery according to the first embodiment, the first derivative curve obtained by differentiating the QV curve once, and the second derivative curve obtained by differentiating the QV curve twice. It is a figure which shows.
  • the horizontal axis is the capacitance.
  • the vertical axis is voltage.
  • the vertical axis is dQ / dV obtained by dividing the capacitance change per unit time by the voltage change per unit time.
  • the vertical axis is the value obtained by dividing the capacitance change per unit time by the voltage change per unit time and further dividing by the capacitance change per unit time (dQ / dV) / dQ.
  • the 1st derivative curve and the 2nd derivative curve each have a plurality of extremum points.
  • the extremum point has a maximum point and a minimum point.
  • the maximum point in the first derivative curve is generated based on the voltage stable region where the voltage is flat in the QV curve. In the vicinity of the maximum point on the first derivative curve, a battery reaction of a predetermined stage occurs in the secondary battery 10.
  • the minimum point in the one-time differential curve is generated based on the voltage fluctuation region in which the voltage fluctuation is large in the QV curve. In the vicinity of the minimum point on the first derivative curve, the battery reaction is switched from one stage to the next in the secondary battery 10.
  • the extremum point on the second derivative curve is the portion of the first derivative curve that has a large slope, for example, the point where the voltage stable region on the QV curve starts or ends.
  • the data detected by the detection means 21 is sent to the two-point capacity calculation means 22.
  • the two-point capacity calculation means 22 obtains a predetermined two-point capacity based on the data.
  • FIG. 3 is an example of a double derivative curve obtained by twice differentiating the QV curve of the initial secondary battery.
  • the double differential curve shown in FIG. 3 is obtained by, for example, the detecting means 21.
  • the "initial secondary battery” is a secondary battery before the deterioration of the secondary battery occurs, and is, for example, a secondary battery in which the charge / discharge cycle is performed within 10 times.
  • the shape of the second derivative curve changes as the deterioration of the secondary battery 10 progresses.
  • the intensity of the peak of the second derivative curve changes, and the position of the peak shifts.
  • a new derived peak occurs on the second derivative curve.
  • the new derivative peak occurs, for example, due to a difference between the remaining capacity of the positive electrode and the remaining capacity of the negative electrode due to the difference in the degree of deterioration of the positive electrode and the negative electrode of the secondary battery 10.
  • the two-point capacitance calculation means 22 obtains the capacitance difference X between a specific peak among a plurality of maximum points in the double differential curve and a derived peak generated in the vicinity of the specific peak.
  • the specific peak is the maximum point that appears in the double differential curve of the initial secondary battery.
  • a derivative peak is generated in the vicinity of the specific peak.
  • the maximum points P2 and P3 shown in FIG. 3 can be specific peaks.
  • the maximum point P3 is set as a specific peak.
  • the maximum point P3 is a peak that appears third from the fully discharged state and second from the fully charged state in the initial secondary battery.
  • the maximum point P3 represents the starting point of the third voltage stable region from the fully discharged state in the initial secondary battery.
  • the maximum point P3 occurs, for example, in the range where the remaining capacity with respect to the fully charged capacity is 40% or more and 70% or less.
  • the maximum point P3 is a peak that occurs when the working voltage of the secondary battery is in the range of 3.8 V or more and 4.1 V or less.
  • the maximum point P3 occurs in the range of 3.8 V or more and 4.1 V or less when the horizontal axis is converted into a voltage by mathematical conversion.
  • FIG. 4 is an enlarged view of the vicinity of the maximum point P3 of the double differential curve.
  • the horizontal axis of FIG. 4 is the remaining capacity (SOH) with respect to the fully charged capacity.
  • FIG. 4 is a double derivative curve in different charge / discharge cycles of the secondary battery.
  • the graph shown in FIG. 4 is a double differential curve of the secondary battery in which more charge / discharge cycles are repeated as the lower side is, and the deterioration of the secondary battery is progressing.
  • the strength of the maximum point P3 decreases as the deterioration of the secondary battery progresses, and the maximum point P3 shifts to the higher capacity side.
  • the intensity of a specific peak decreases as it deteriorates.
  • a derivative peak NP occurs in the vicinity of the specific peak.
  • the strength of the derived peak NP becomes stronger as the deterioration progresses.
  • the derived peak NP occurs, for example, on the lower capacitance side than the specific peak in the double derivative curve.
  • the derived peak NP generated in the vicinity of the maximum point P3 is generated between, for example, the maximum point P3 and the minimum point adjacent to the low capacitance side of the maximum point P3.
  • FIG. 5 is an enlarged view of a characteristic portion of the first derivative curve obtained by once differentiating the QV curve of the secondary battery according to the first embodiment.
  • FIG. 5 is an enlarged view of the vicinity of the maximum point P3'corresponding to the voltage stable region that appears third from the fully discharged state in the one-time differential curve of the initial secondary battery.
  • a derived peak NP' occurs as the secondary battery deteriorates.
  • the two-point capacity calculating means 22 obtains the capacity difference X between the specific peak (for example, the maximum point P3) and the derived peak NP after the deterioration of the secondary battery 10 progresses and the derived peak NP occurs.
  • the capacity difference X is an index of deterioration.
  • the position and timing at which the derived peak NP occurs can be predicted based on the results of the deterioration test of the calibration sample described later. Therefore, even in the process of using the secondary battery 10, it is possible to determine whether the extreme value point being monitored is the derived peak NP or the specific peak.
  • the capacitance difference X is
  • the capacity difference X obtained by the two-point capacity calculation means 22 is sent to the correction means 23.
  • the correction means 23 estimates the SOH of the secondary battery 10 based on the capacity difference X.
  • the correction means corrects the SOH of the secondary battery 10 using the estimated SOH as a correction value.
  • the correction value satisfies the following equation (1).
  • SOH AX + B ...
  • SOH is an estimated degree of deterioration of the secondary battery and is a correction value.
  • X is the capacitance difference between the specific peak and the derived peak.
  • a and B are constants.
  • the constants A and B are obtained in advance from the relationship between the capacitance difference X in the calibration sample and the degree of deterioration of the calibration sample.
  • the constants of A and B differ depending on the selection of a specific peak or a derived peak.
  • the constants A and B are obtained in advance by the calibration sample and are stored in the correction means 23 in advance.
  • the calibration sample is prepared with the same material and the same capacity as the actually used secondary battery 10.
  • the deterioration behavior of the calibration sample prepared with the same material and the same capacity is similar to the deterioration behavior of the secondary battery 10 actually used.
  • the calibration sample deteriorates as the charge / discharge cycle is repeated, and the shape of the derivative curve changes twice.
  • the intensity of the specific peak for example, the maximum point P3
  • the position of the specific peak shifts.
  • a derived peak NP occurs in the vicinity of a specific peak. The change of the specific peak and the change of the derived peak NP due to the deterioration of the calibration sample substantially coincide with the deterioration behavior of the secondary battery 10 in actual use.
  • the specific peak and derived peak NP selected in the calibration sample are the same as the specific peak and derived peak NP selected in the secondary battery 10 actually used. In other words, the secondary battery 10 actually used selects the specific peak and the derived peak NP selected in the calibration sample as the specific peak and the derived peak NP.
  • the capacitance difference between the specific peak and the derived peak NP is obtained every predetermined number of charge / discharge cycles.
  • the degree of deterioration (SOH) of the calibration sample at the time when the capacitance difference is calculated in the calibration sample is also obtained.
  • the degree of deterioration (SOH) of the calibration sample is obtained by dividing the capacity from full charge to full discharge (Ah) by the capacity from initial full charge to full discharge (Ah) in the number of cycles.
  • the calibration sample does not discharge during charging or charge during discharging, so that SOH can be obtained as an actually measured value.
  • FIG. 6 shows the relationship between the degree of deterioration of the calibration sample and the capacitance difference between the specific peak and the derived peak. As shown in FIG. 6, there is a linear correlation between the degree of deterioration of the calibration sample and the capacitance difference between the specific peak and the derived peak.
  • the correction means 23 sends the obtained correction value to the secondary battery 10.
  • the SOH value of the secondary battery 10 is replaced with the correction value.
  • the replacement with the correction value is performed, for example, after passing through all the selected specific peaks and derived peaks NP during charging.
  • the replacement with the correction value is performed every time the selected specific peak and the derived peak NP are passed, for example, during charging.
  • the correction may be performed when the correction value is obtained.
  • the correction is performed by adding the difference between the holding value (value before correction) and the correction value at the time when the correction value is obtained to the holding value at the time when the correction is performed. You may.
  • the correction is gradually performed from the correction value acquisition point to the correction completion point so that the value corresponding to the difference between the possession value and the correction value at the time when the correction value is obtained is added to the possession value at the correction completion point.
  • the value may be corrected.
  • FIG. 7 is a schematic diagram of the secondary battery according to the first embodiment.
  • the secondary battery 10 includes, for example, a power generation element 4, an exterior body 5, and an electrolytic solution (not shown).
  • the exterior body 5 covers the periphery of the power generation element 4.
  • the exterior body 5 is, for example, a metal laminate film in which a metal foil 5A is coated with a polymer film (resin layer 5B) from both sides.
  • the power generation element 4 is connected to the outside by a pair of connected terminals 6.
  • the electrolytic solution is housed in the exterior body 5 and impregnated in the power generation element 4.
  • the power generation element 4 includes a positive electrode 2, a negative electrode 3, and a separator 1.
  • the separator 1 is sandwiched between the positive electrode 2 and the negative electrode 3.
  • the separator 1 is, for example, a film having an electrically insulating porous structure. A known separator 1 can be used.
  • the positive electrode 2 has a positive electrode current collector 2A and a positive electrode active material layer 2B.
  • the positive electrode active material layer 2B is formed on at least one surface of the positive electrode current collector 2A.
  • the positive electrode active material layer 2B may be formed on both surfaces of the positive electrode current collector 2A.
  • the positive electrode current collector 2A is, for example, a conductive plate material.
  • the positive electrode active material layer 2B has, for example, a positive electrode active material, a conductive auxiliary material, and a binder.
  • the positive electrode active material reversibly proceeds with the occlusion and release of lithium ions, the desorption and insertion (intercalation) of lithium ions, or the doping and dedoping of lithium ions and counter anions.
  • the positive electrode active material is, for example, lithium cobalt oxide (LCO), lithium nickel cobalt manganese composite oxide (NCM), lithium nickel cobalt aluminum composite oxide (NCA), lithium manganese oxide (LMO), lithium iron phosphate (LFP).
  • the positive electrode active material layer 2B may contain a plurality of these positive electrode active materials.
  • the positive electrode active material may be represented by , for example, LMO 2.
  • M is any one of the transition metal elements selected from the group consisting of Co, Ni, Al, Mn, and Fe.
  • the positive electrode active material is not limited to these, and known materials can be used. Known conductive auxiliary materials and binders can be used.
  • the negative electrode 3 has a negative electrode current collector 3A and a negative electrode active material layer 3B.
  • the negative electrode active material layer 3B is formed on at least one surface of the negative electrode current collector 3A.
  • the negative electrode active material layer 3B may be formed on both surfaces of the negative electrode current collector 3A.
  • the negative electrode current collector 3A is, for example, a conductive plate material.
  • the negative electrode active material layer 3B has, for example, a positive electrode active material, a conductive auxiliary material, and a binder.
  • the negative electrode active material may be any compound that can occlude and release ions, and a known negative electrode active material used in a lithium ion secondary battery can be used.
  • the negative electrode active material is, for example, graphite.
  • the negative electrode active material may be metallic lithium, a silicon compound or the like.
  • the electrolytic solution is sealed in the exterior body 5 and impregnated in the power generation element 4.
  • a known electrolytic solution can be used.
  • the battery pack 100 according to the first embodiment can correct the SOH of the secondary battery 10 to an appropriate value by the control device 20.
  • control device 20 estimates the SOH of the secondary battery 10 by utilizing the derived peak NP generated with the deterioration, the deteriorated state of the secondary battery 10 can be accurately grasped. .. Further, by using the double differential curve, the derived peak NP can be specified at the initial stage of deterioration of the secondary battery 10, and the deteriorated state of the secondary battery 10 can be grasped more accurately.
  • the point that is mathematically equivalent to the specific peak of the double differential curve and the point that is mathematically equivalent to the derived peak are changed to the capacitance difference between the specific peak and the derived peak of the double differential curve.
  • the capacitance difference between them may be used.
  • the "mathematically equivalent point” means a point having an equivalent relationship by mathematical transformation.
  • the second derivative curve is mathematically calculated from the QV curve and the first derivative curve, and the points mathematically equivalent to the specific peak and the derived peak in the second derivative curve are the first derivative. It is also on the curve and the QV curve. Therefore, in the one-time differential curve or the QV curve, the capacitance difference of points mathematically equivalent to the specific peak and the derived peak of the two-time differential curve may be used for calculating the correction value.
  • Example 1 A lithium ion secondary battery was produced as the secondary battery of Example 1.
  • a positive electrode was prepared.
  • a mixture of LiNi 0.33 Mn 0.33 Co 0.33 O 2 (NCM) and LiMn 2 O 4 (LMO) as the positive electrode active material, carbon black as the conductive material, and polyvinylidene fluoride (PVDF) as the binder are prepared. bottom.
  • the weight ratio of NCM to LMO was 8: 2.
  • These were mixed in a solvent to prepare a paint, which was applied onto a positive electrode current collector made of aluminum foil.
  • the mass ratio of the positive electrode active material, the conductive material, and the binder was 95: 2: 3.
  • the solvent was removed.
  • a positive electrode sheet having a basis weight of the positive electrode active material of 10.0 mg / cm 2 was prepared.
  • the negative electrode was prepared.
  • Graphite was prepared as the negative electrode active material
  • SBR styrene-butadiene rubber
  • CMC carboxymethyl cellulose
  • the positive electrode and the negative electrode prepared above were laminated via a separator.
  • a laminate of polyethylene and polypropylene was used as the separator.
  • the obtained power generation unit was impregnated with the prepared electrolytic solution, sealed in the exterior body, and then vacuum-sealed to prepare a lithium secondary battery for evaluation.
  • the electrolytic solution was prepared by dissolving 1.5 mol / L of lithium hexafluorophosphate (LiPF 6 ) in a solvent in which equal amounts of ethylene carbonate (EC) and dimethyl carbonate (DEC) were mixed.
  • LiPF 6 lithium hexafluorophosphate
  • the charge / discharge cycle was performed in a low temperature environment of 0 ° C.
  • the condition of one charge / discharge was that the battery was charged to a final voltage of 4.2 V with a constant current corresponding to 0.2 C, and then discharged to 3.0 V with a constant current corresponding to 0.2 C.
  • 1C represents a current value for discharging the reference capacity of the battery in 1 hour
  • 0.2C represents a current value of 1/5 of that.
  • the measured SOH was obtained by dividing the capacity from full charge to full discharge in each cycle by the capacity from the first full charge to full discharge and multiplying by 100.
  • the estimated SOH is a correction value obtained from the above-mentioned relational expression (1).
  • the estimated SOH may be a correction value obtained by using the points corresponding to the specific peak and the derived peak in the QV curve and the one-time differential curve.
  • the maximum point of the double differential curve was used in order to capture the inflection point more clearly.
  • Example 1 the maximum point P3 was selected as a predetermined peak, the derived peak NP3 generated on the low capacitance side near the maximum point P3 was selected as the derived peak, and the capacitance difference between these peaks was used.
  • Example 2 In Example 2, the maximum point P2 was selected as a predetermined peak, the derived peak NP2 generated on the low capacitance side near the maximum point P2 was selected as the derived peak, and the point using the capacitance difference between these peaks was used. Different from Example 1. The other conditions were the same as in Example 1, and the estimated SOH was obtained.
  • Comparative Example 1 In Comparative Example 1, the estimated SOH was obtained from the integrated current amount without correction. Other conditions were the same as in Example 1.
  • Comparative Examples 2 and 3 In Comparative Examples 2 and 3, the estimated SOH was obtained by using the change with the deterioration of the dQ / dV value of the specific extremum point of the one-time differential curve. Other conditions were the same as in Example 1.
  • the estimated SOH was obtained by using the change in the dQ / dV value of the minimum point (B2') accompanying the voltage fluctuation region that appears second from the fully discharged state of the one-time differential curve.
  • the estimated SOH was obtained by using the change in the dQ / dV value of the maximum point (P3') accompanying the voltage stable region that appears third from the fully discharged state of the one-time differential curve.
  • Comparative Examples 4 and 5 In Comparative Examples 4 and 5, the estimated SOH was obtained by using the change in the volume difference between two points that are not the specific peak and the derivative peak. Other conditions were the same as in Example 1.
  • Table 1 shows the results of the cycle test of the secondary batteries of Examples 1 and 2 and Comparative Examples 1 to 5.
  • a storage battery in which the SOH estimation process according to the present invention is incorporated in a control unit (control device) is prepared.
  • the storage battery (battery pack) is mainly composed of a battery management system including a control unit and a safety mechanism, and 10 lithium-ion secondary battery cells.
  • the prepared storage battery was fully discharged at a rate of 0.2 C at room temperature and then fully charged at a rate of 0.2 C at room temperature to bring the storage battery into the initial state of actual use. At the time of this charging, the derivative curve at each voltage was acquired twice, and the SOH on the software of the control unit was recorded.
  • the 100-cycle charge / discharge step has an evaluation step including at least the following elements. 1) In a temperature environment of 45 ° C., a cycle of fully discharging at a rate of 0.5C and then fully charging at a rate of 0.5C is repeated 100 times. 2) After the final full discharge (that is, the 100th cycle full discharge), the battery is fully charged again at room temperature at a rate of 0.2 C, and a double differential curve at the time of charging is obtained. 3) The obtained double differential curve after the 100-cycle charge / discharge step is compared with the double differential curve in the above initial state.
  • the second derivative curve of the first deteriorated state, the second derivative curve of the second deteriorated state, and the second derivative curve of the third deteriorated state are output, respectively, and between the specific peak and the derived peak.
  • the capacity difference was calculated.

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Abstract

Selon la présente invention, étant donné que X représente une valeur correspondant à une différence de capacité entre un pic spécifique, ou un point mathématiquement équivalent de celui-ci, parmi de multiples points d'extremum sur des courbes différentielles de second ordre obtenues par différenciation d'une courbe Q-V initiale d'une batterie secondaire par rapport à une capacité et par rapport à une tension et à un pic dérivé, ou un point mathématiquement équivalent de celui-ci, qui est formé au voisinage du pic spécifique sur les courbes différentielles de second ordre lorsque la batterie secondaire se détériore et que A et B représentent des constantes obtenues à l'avance à partir de la relation entre le X dans un échantillon d'étalonnage et un degré de détérioration de l'échantillon d'étalonnage, le dispositif de commande de batterie secondaire selon l'invention corrige le degré de détérioration SOH de la batterie secondaire en (1) : SOH=AX+B. Un bloc-batterie comprenant ce dispositif de commande de batterie secondaire présente un niveau élevé de sécurité et contribue à l'alimentation stable en énergie et à des objectifs de développement durables.
PCT/JP2020/012590 2020-03-23 2020-03-23 Dispositif de commande de batterie secondaire, bloc-batterie et procédé de commande de batterie secondaire WO2021191939A1 (fr)

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CN113759252A (zh) * 2021-10-09 2021-12-07 长沙理工大学 基于直流内阻ir压降的储能电站电池簇不一致性在线评估方法

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