WO2021220393A1 - 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
WO2021220393A1
WO2021220393A1 PCT/JP2020/018090 JP2020018090W WO2021220393A1 WO 2021220393 A1 WO2021220393 A1 WO 2021220393A1 JP 2020018090 W JP2020018090 W JP 2020018090W WO 2021220393 A1 WO2021220393 A1 WO 2021220393A1
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Prior art keywords
secondary battery
soc
amount
point
curve
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PCT/JP2020/018090
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English (en)
Japanese (ja)
Inventor
拳 中村
靖博 ▲高▼木
佑輔 久米
英司 遠藤
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Tdk株式会社
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Priority to PCT/JP2020/018090 priority Critical patent/WO2021220393A1/fr
Publication of WO2021220393A1 publication Critical patent/WO2021220393A1/fr

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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
    • 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]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or 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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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 charge amount (remaining capacity) of the secondary battery
  • SOH is an index showing the deterioration state of the battery.
  • SOC is the ratio of the amount of charge to the full charge capacity.
  • SOH is the ratio of the fully charged capacity at the time of deterioration to the initial fully charged capacity.
  • Patent Document 1 discloses a method of estimating the charge state by integrating the charge / discharge currents of a secondary battery.
  • Patent Document 2 discloses a method of detecting an open circuit voltage of a secondary battery and estimating a charge state based on the open circuit voltage.
  • the estimation error still occurs in the charging state estimation method based on the charge / discharge current integration and the open circuit voltage as described above. This is because the error of the current sensor and the voltage sensor is large, and this error cannot be reset until it is fully charged and fully discharged. Therefore, the error cannot be reset when estimating between the fully charged state and the fully discharged state. .. Further, since the open circuit voltage depends on the deteriorated state of the secondary battery, there is a concern that the estimation accuracy will be further lowered.
  • the SOC estimated value may vary depending on the individual difference of the secondary battery, the deterioration state, the environmental temperature, and the like.
  • the characteristic points of the charge curve change depending on the deterioration state, and the mode of change due to high temperature deterioration and the mode of change due to low temperature deterioration are different. Therefore, it is difficult to estimate the charge state of the secondary battery with high accuracy even by using the feature points of the charge curve.
  • the present invention has been made in view of the above problems, and provides a secondary battery control device, a battery pack, and a secondary battery control method capable of correcting the charge state of a secondary battery with high accuracy. With the goal.
  • the voltage V of the secondary battery is 3.68 V or more, and the voltage V of the secondary battery changes.
  • dQ / dV be the ratio of the change amount of the charge amount Q to the amount
  • Qd (dQ / dQ /) showing the relationship between the charge amount Q and the change amount of the dQ / dV with respect to the change amount of the charge amount Q.
  • the first turning point at which the dV) / dQ curve changes from falling to rising or a point mathematically equivalent to this is set as the SOC correction point, and after the SOC correction point or the SOC correction point, a predetermined reference SOC value is set. Based on this, the SOC of the secondary battery is corrected.
  • the reference SOC value is a value measured using a reference secondary battery having the same configuration as the secondary battery. May be good.
  • the battery pack according to the second aspect may be configured to include a secondary battery, the above-mentioned control device for the secondary battery, and a charging means for supplying a current to the secondary battery. ..
  • the secondary battery has a positive electrode and a negative electrode
  • the positive electrode has a general formula of LiMO 2 (where M is Co, Ni, Al, Mn and Fe.
  • the negative electrode may be configured to contain graphite and contain an oxide represented by at least one transition metal element selected from the group consisting of.
  • the positive electrode may be configured to contain a lithium nickel cobalt manganese composite oxide.
  • the SOC corrected by the control device of the secondary battery may be used as a display of the remaining charge amount until the battery is fully charged.
  • the method for controlling the secondary battery according to the third aspect is a change in the voltage V of the secondary battery when the voltage V of the secondary battery is 3.68 V or more while charging the secondary battery.
  • dQ / dV be the ratio of the change amount of the charge amount Q to the amount
  • Qd (dQ / dQ /) showing the relationship between the charge amount Q and the change amount of the dQ / dV with respect to the change amount of the charge amount Q.
  • the first turning point at which the dV) / dQ curve changes from falling to rising or a point mathematically equivalent to this is set as the SOC correction point, and after the SOC correction point or the SOC correction point, a predetermined reference SOC value is set. Based on this, the SOC of the secondary battery is corrected.
  • the secondary battery control device the battery pack, and the secondary battery control method according to the above aspect
  • the secondary battery can be efficiently charged based on the highly accurate estimation of the SOC.
  • the safety of the secondary battery is enhanced, the stable supply of energy is contributed, and the sustainable development goal is contributed. can do.
  • 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, a charging means 20, and a control device 30. Signal communication is performed between the secondary battery 10 and the control device 30 and between the charging means 20 and the control device 30.
  • the signal communication may be wired or wireless.
  • the secondary battery 10 is, for example, a lithium ion secondary battery. The specific configuration of the secondary battery 10 will be described later.
  • the number of secondary batteries 10 may be one or two or more.
  • the two or more secondary batteries 10 may be connected in series or in parallel.
  • the charging means 20 supplies a current to the secondary battery 10 to charge the secondary battery 10.
  • a constant current charging device can be used.
  • the charging means 20 is provided inside the battery pack 100, but may be provided outside the battery pack 100, for example, in an electric device to which the battery pack 100 is mounted.
  • the control device 30 is a control device (controller) that controls the state of charge of the secondary battery 10.
  • the control device 30 is, for example, a microcomputer.
  • the control device 30 includes a detection means 31, a calculation means 32, a correction means 33, and a storage means 34.
  • the detecting means 31 detects the amount of electricity supplied to the secondary battery 10, that is, the charge amount Q of the secondary battery 10 and the voltage V of the secondary battery 10.
  • the charge amount Q is a value (I ⁇ t) obtained by multiplying the current value I supplied from the charging means 20 to the secondary battery 10 and the current supply time t.
  • the detection interval between the charge amount Q and the voltage V varies depending on conditions such as the current value I supplied from the charging means 20 to the secondary battery 10, but is usually 1 second or more and 10 minutes or less.
  • the calculation means 32 sets the ratio of the change amount of the charge amount Q to the change amount of the voltage V of the secondary battery 10 detected by the detection means 31 as dQ / dV, and sets the charge amount Q and the dQ with respect to the change amount of the charge amount Q.
  • a Qd (dQ / dV) / dQ curve showing the relationship with the rate of change in / dV is created.
  • FIG. 2 shows the QV curve, the QdQ / dV curve, and the Qd (dQ / dV) / dQ curve when the secondary battery is charged using the battery pack according to the embodiment of the present invention.
  • the horizontal axis is the charge amount Q of the secondary battery 10.
  • FIG. 2A is a QV curve, and the vertical axis is the voltage V.
  • FIG. 2B is a Q-dQ / dV curve, and the vertical axis is dQ / dV.
  • FIG. 2C is a Qd (dQ / dV) / dQ curve, and the vertical axis is d (dQ / dV) / dQ.
  • the QV curve, the QdQ / dV curve, and the Qd (dQ / dV) / dQ curve are data when the secondary battery 10 is charged with a constant current from a fully discharged state.
  • the QdQ / dV curve (first derivative curve) has a plurality of peaks.
  • the plurality of peaks are indicated by the peak tops (inflection points where the Q-dQ / dV curve changes from rising to falling) indicated by the maximum points P1, P2, P3, and P4 in the figure, and the minimum points B1, B2, and B3.
  • the peak bottom (the inflection point where the Q-dQ / dV curve turns from falling to rising).
  • the Q-dQ / dV curve shows the maximum peak in the range where the voltage V of the secondary battery is 3.65 V or more and less than 3.75 V.
  • Maxima points P1 to P4 on the Q-dQ / dV curve occur based on a voltage-stabilized region where the voltage is flat on the Q-V curve. In the vicinity of the maximum points P1 to P4 on the Q-dQ / dV curve, a battery reaction of a predetermined stage occurs in the secondary battery 10.
  • the minimum points B1 to B3 in the Q-dQ / dV curve are 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 Q-dQ / dV curve, the stage of the positive electrode active material or the negative electrode active material in the secondary battery 10 is switched.
  • the inflection point of the Qd (dQ / dV) / dQ curve (second derivative curve) is the portion of the QdQ / dV curve (first derivative curve) having a large slope.
  • the inflection point on the d (dQ / dV) / dQ curve is, for example, the boundary between the voltage stable region and the voltage fluctuation region on the QV curve.
  • the inflection point in the Qd (dQ / dV) / dQ curve is, for example, the point where the voltage stable region or the voltage fluctuation region starts or ends.
  • the correction means 33 is the first inflection point where the voltage V of the secondary battery 10 is 3.68 V or more and the Qd (dQ / dV) / dQ curve changes from falling to rising (P2 in FIG. 2). ') Is the SOC correction point. This SOC correction point is between the maximum point P2 and the minimum point B2 of the Q-dQ / dV curve. Then, after the SOC correction point or the SOC correction point, the SOC of the secondary battery is corrected based on a predetermined reference SOC value. That is, at the SOC correction point, the SOC (charge rate) of the secondary battery 10 is corrected on the assumption that it has reached a predetermined reference SOC value. Alternatively, after the SOC correction point, the SOC of the secondary battery 10 is corrected on the assumption that it has reached the total value of the predetermined reference SOC value and the SOC corresponding to the charge amount Q charged after the SOC correction point.
  • the reference SOC value may be, for example, a value measured using a reference secondary battery having the same configuration as the secondary battery 10.
  • each material constituting the battery is the same as that of the secondary battery 10, and the QV curve, QdQ / dV curve, and Qd (dQ / dV) / dQ curve when the battery is charged. Is the same battery as the secondary battery 10. That is, the reference SOC value is, for example, in the initial Qd (dQ / dV) / dQ curve of the reference secondary battery, when the voltage V is 3.68V or more and Qd (dQ / dV) / dQ.
  • the reference SOC value is the Q obtained by the constant current constant voltage charge, with the charge amount when the reference secondary battery in the fully discharged state is fully charged by the constant current constant voltage charge as the denominator. It is a value calculated by using the charge amount at the inflection point P2'of the ⁇ d (dQ / dV) / dQ curve as a molecule.
  • FIG. 3 is a graph showing changes between the maximum point P2 and the minimum point B2 of the SOC ⁇ dQ / dV curve by the deterioration test of the secondary battery.
  • the minimum point B2 f is.
  • This is the minimum point in the secondary battery 10 with SOH 85%.
  • SOH the minimum point in the secondary battery 10
  • the dQ / dV value of the maximum point P2 decreases.
  • the position of the minimum point B2 shifts to the low charge amount side and becomes far from the minimum point B2 i of the initial secondary battery 10.
  • the slope of the QdQ / dV curve after the minimum point B2 becomes smaller. Therefore, it may be difficult for the secondary battery 10 to accurately detect the charge amount at the maximum point P2 and the minimum point B2 by repeating the charge / discharge cycle.
  • FIG. 4 is a graph showing the change of the inflection point of the SOC-d (dQ / dV) / dQ curve depending on the deterioration state of the secondary battery.
  • the inflection point P2' m inflection point in the secondary battery 10 of the SOH 89%
  • the SOC of the secondary battery 10 can be estimated with high accuracy by correcting the SOC with reference to the position of the inflection point P2'of the SOC-d (dQ / dV) / dQ curve.
  • the corrected SOC can be used as a display of the remaining charge amount until the battery is fully charged. Further, the corrected SOC can be used as a time display until full charge in combination with the amount of current supplied by the charging means 20.
  • the storage means 34 stores the reference SOC value calculated by using the reference secondary battery.
  • the control method of the secondary battery 10 shown in FIG. 5 includes the following steps S1 to S4.
  • step S1 the voltage value V of the secondary battery 10 is measured.
  • the secondary battery 10 is discharged. The discharge may be performed until the voltage value V of the secondary battery 10 is in a fully discharged state.
  • the fully discharged state is, for example, a state in which the voltage V of the secondary battery 10 is 3.0 V or less.
  • the secondary battery 10 is charged (step S2).
  • step S2 it is preferable to charge the secondary battery 10 by constant current charging.
  • the charging rate is preferably in the range of 0.1C or more and 2C or less, where 1C is the charging rate when the secondary battery 10 is charged from the fully discharged state to the fully charged state in 1 hour.
  • step S2 while charging the secondary battery 10, the voltage V of the secondary battery 10 and the charge amount Q (the amount of electricity supplied to the secondary battery 10) are detected. Then, the detected voltage V is differentiated by the charge amount Q (first-order differentiation) to calculate dQ / dV, and further, dQ / dV is differentiated by the charge amount Q (second-order differentiation) to obtain Qd (second-order differentiation). Obtain the dQ / dV) / dQ curve.
  • step S3 the voltage V of the secondary battery 10 is 3.65 V or more, and the first inflection point at which the Qd (dQ / dV) / dQ curve changes from falling to rising is detected. Then, this inflection point is recognized as an SOC correction point.
  • step S4 after the SOC correction point or the SOC correction point, the SOC of the secondary battery is corrected based on a predetermined reference SOC value.
  • the SOC of the secondary battery 10 is corrected on the assumption that it has reached the reference SOC value stored in the storage means 34.
  • the SOC of the secondary battery 10 is set to the total value of the predetermined reference SOC value and the SOC corresponding to the charge amount Q charged after the SOC correction point. Correct as reached.
  • FIG. 6 is a cross-sectional view of the secondary battery 10 that can be used in the battery pack 100 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 from both sides with a polymer film (resin layer 5B).
  • 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 preferably contains an oxide represented by the general formula LiMO 2 (where M is a transition metal element containing at least one of Co, Ni, Al, Mn, and Fe). Further, the positive electrode active material may contain a phosphate. Specific examples of the positive electrode active material include lithium cobalt oxide (LCO), lithium nickel cobalt manganese composite oxide (NCM), lithium nickel cobalt aluminum composite oxide (NCA), lithium manganese oxide (LMO), and phosphoric acid. Lithium iron oxide (LFP) can be mentioned.
  • the positive electrode active material layer 2B may contain a plurality of these positive electrode active materials.
  • 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.
  • the electrolytic solution one in a public land can be used.
  • the voltage V of the secondary battery 10 in the control device 30 is 3.68 V or more, and Qd.
  • the SOC of the secondary battery 10 is corrected to the reference SOC value with the first inflection point P2'in which the (dQ / dV) / dQ curve changes from falling to rising as the SOC correction point.
  • the position of the inflection point P2'on the Qd (dQ / dV) / dQ curve has little variation due to deterioration of the secondary battery 10. Therefore, according to the control device 30, even if the secondary battery 10 is deteriorated by the charge / discharge cycle, the SOC of the secondary battery 10 being charged can be corrected with high accuracy.
  • the reference SOC value amount is a value measured using a reference secondary battery having the same configuration as the secondary battery 10
  • the secondary battery 10 being charged SOC can be corrected with higher accuracy.
  • the inflection point P2' is a hexagonal / monooblique biphasic coexistence reaction in the low SOC region of the NCM. Derived from the peak. Since this is a reaction in the low voltage region, oxidative deterioration of the active material is unlikely to occur. Therefore, the position of the inflection point P2'is more stable.
  • NCM lithium nickel cobalt manganese composite oxide
  • the configurations and combinations thereof in the respective embodiments are examples, and the configurations are added or omitted within the range not deviating from the gist of the present invention. , Replacements, and other changes are possible.
  • the calculation of the reference SOC value is obtained using the reference secondary battery, but the present invention is not limited to this.
  • the reference SOC value may be obtained in the initial state of the secondary battery 10 incorporated in the battery pack 100, and the obtained value may be stored in the storage means 35.
  • the initial state of the secondary battery 10 is a state in which the number of charge / discharge cycles is 10 or less.
  • Example 1 (1) Preparation of Lithium Ion Secondary Battery A lithium ion secondary battery was manufactured as a secondary battery. First, a positive electrode was prepared. NCM (composition formula: Li 1.0 Ni 1/3 Co 1/3 Mn 1/3 O 2 ) was prepared as the positive electrode active material, carbon black was prepared as the conductive auxiliary material, and polyvinylidene fluoride (PVDF) was prepared as the binder. 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 auxiliary material, and the binder was 95: 2: 3. After coating, 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.
  • NCM composition formula: Li 1.0 Ni 1/3 Co 1/3 Mn 1/3 O 2
  • PVDF polyvinylidene fluoride
  • 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 (DMC) were mixed.
  • LiPF 6 lithium hexafluorophosphate
  • the secondary battery (reference secondary battery) manufactured in (1) above is charged to a final voltage of 4.2 V with a constant current value of 0.2 C in a temperature environment of 25 ° C. After that, it was discharged to 3.0 V at 0.2 C. After that, the reference secondary battery was charged to a final voltage of 4.2 V by constant current and constant voltage charging to bring it into a fully charged state. The current supply amount at this time was defined as the fully charged amount of the secondary battery.
  • the QV curve, QdQ / dV curve and Qd (dQ / dV) / dQ curve obtained by this charging were the same as those shown in FIG.
  • the reference SOC value is set to 35%.
  • the control device includes a detection means having a coulomb counter and a voltage measuring instrument, a calculation means, a correction means, a storage means, and an SOC display means.
  • the reference SOC value obtained in (2) above is stored in the storage means, the voltage V of the lithium ion secondary battery is 3.68 V or more, and the Qd (dQ / dV) / dQ curve descends.
  • the first turning point P2'that starts to rise it is set to correct that the SOC of the lithium ion secondary battery has reached the reference SOC value (35%).
  • the lithium ion secondary A battery pack was prepared and evaluated in the same manner as in Example 1 except that the SOC of the battery was set to be corrected to reach the reference SOC value (30%). The results are shown in Table 1 below.
  • the lithium ion secondary A battery pack was prepared and evaluated in the same manner as in Example 1 except that the SOC of the battery was set to be corrected to reach the reference SOC value (45%). The results are shown in Table 1 below.
  • the battery packs produced in Example 1 had a smaller difference between the controlled SOC and the actually measured SOC of the lithium ion secondary battery after deterioration due to the charge / discharge cycle. ..
  • the charging efficiency of a lithium-ion secondary battery may decrease due to deterioration of the active material or the like due to repeated charge / discharge cycles. Therefore, in Comparative Example 1 in which the SOC is not corrected during charging, the difference between the controlled SOC and the measured SOC becomes large. Further, the height and position of the maximum point P2 and the minimum point B2 on the QdQ / dV curve change due to deterioration of the lithium ion secondary battery.

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Abstract

Selon la présente invention, si la tension V d'une batterie secondaire est au moins égale à 3,68 V alors que la batterie secondaire est chargée, un dispositif de commande de batterie secondaire définit un point de correction d'état de charge pour être le premier point d'inflexion auquel la courbe Q-d(dQ/dV)/dQ, représentant la relation entre une quantité de charge Q de la batterie secondaire et le rapport de la quantité de variation de dQ/dV à la quantité de variation de la quantité de charge Q, passe de la chute à la montée, ou un point qui est mathématiquement équivalent audit point d'inflexion, où dQ/dV est le rapport de la quantité de variation de la quantité de charge Q de la batterie secondaire à la quantité de variation de la tension V, et corrige l'état de charge de la batterie secondaire, sur la base d'une valeur d'état de charge de référence prédéterminée, au point de correction d'état de charge, ou après le point de correction d'état de charge. Selon la présente invention, il est possible d'améliorer la sécurité des batteries secondaires, de contribuer à une alimentation stable en énergie et de contribuer à l'objectif de développement durable.
PCT/JP2020/018090 2020-04-28 2020-04-28 Dispositif de commande de batterie secondaire, bloc-batterie et procédé de commande de batterie secondaire WO2021220393A1 (fr)

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