WO2021181650A1 - Dispositif de commande pour batterie secondaire, bloc-batterie et procédé de commande pour batterie secondaire - Google Patents

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

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WO2021181650A1
WO2021181650A1 PCT/JP2020/011031 JP2020011031W WO2021181650A1 WO 2021181650 A1 WO2021181650 A1 WO 2021181650A1 JP 2020011031 W JP2020011031 W JP 2020011031W WO 2021181650 A1 WO2021181650 A1 WO 2021181650A1
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Prior art keywords
secondary battery
points
soh
control device
voltage
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PCT/JP2020/011031
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English (en)
Japanese (ja)
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佑輔 久米
英司 遠藤
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Tdk株式会社
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Priority to PCT/JP2020/011031 priority Critical patent/WO2021181650A1/fr
Publication of WO2021181650A1 publication Critical patent/WO2021181650A1/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]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • 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 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 a 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 vertical axis is 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 of the secondary battery, and the voltage of the secondary battery is defined as the vertical axis.
  • X be the slope of two pole points out of a plurality of pole points appearing on the V-dQ / dV curve with the horizontal axis or a straight line connecting two points mathematically equivalent to this.
  • one of the two extreme value points may be the maximum point and the other may be the minimum point.
  • one of the two extreme value points may be a maximum point appearing in a voltage range of 3.6 V or more and 3.8 V or less.
  • one of the two extreme value points may be a minimum point appearing in a voltage range of 3.9 V or more and 4.2 V or less.
  • the secondary battery control device includes the dQ / dV calculating means for calculating the dQ / dV and the two extreme points from a plurality of extreme points appearing on the V ⁇ dQ / dV curve. Is provided, and the inclination calculating means for obtaining the inclination of the straight line connecting the two extreme points and the correction means for correcting the deterioration degree of the secondary battery to the correction value based on the inclination are provided. good.
  • 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 vertical axis is 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 of the secondary battery, and the voltage of the secondary battery is set.
  • X be the slope of two pole points out of a plurality of pole points appearing on the V-dQ / dV curve with the horizontal axis or a straight line connecting two points mathematically equivalent to this.
  • 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 It is a block diagram of the battery pack which concerns on 1st Embodiment.
  • This is an example of the V-dQ / dV curve of the secondary battery.
  • This is an example of a straight line connecting two extreme points in the V-dQ / dV curve of a secondary battery.
  • It is a V-dQ / dV curve of a calibration sample which changes with repeating a charge / discharge cycle.
  • It is a figure which shows the relationship between the degree of deterioration of a calibration sample, and the slope of a straight line connecting two extreme points.
  • It is sectional drawing of the secondary battery which concerns on 1st Embodiment.
  • 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 will be described with reference to a specific example of the control device 20.
  • the control device 20 has, for example, a dQ / dV calculation means 21, a tilt calculation means 22, and a correction means 23.
  • the dQ / dV calculation means 21, the inclination calculation means 22, and the correction means 23 are, for example, programs stored in the control device 20.
  • the dQ / dV calculation means 21 monitors the voltage and the amount of electricity stored in the secondary battery 10.
  • the dQ / dV calculation means 21 calculates dQ / dV from the amount of change in voltage and the amount of change in storage amount per unit time.
  • the calculation of dQ / dV may be performed at the time of charging or at the time of discharging. It is preferable to calculate dQ / dV at the time of charging.
  • the dQ / dV calculation means 21 draws a V ⁇ dQ / dV curve based on the calculated dQ / dV.
  • the V-dQ / dV curve is obtained by differentiating the capacitance measured by the charge / discharge test with a voltage.
  • FIG. 2 is an example of a V-dQ / dV curve.
  • the horizontal axis is the voltage of the secondary battery and the vertical axis is dQ / dV.
  • the V-dQ / dV curve has a plurality of extremum points.
  • the extremum point has a maximum point and a minimum point.
  • P1, P2, P3, and P4 are local maximum points
  • B1, B2, and B3 are local minimum points.
  • the maximum point in the VdQ / dV curve corresponds to a portion where the potential is flat in the charge / discharge curve (QV curve) in which the horizontal axis is the amount of electricity stored and the vertical axis is the voltage. That is, it corresponds to the portion where the battery reaction of a predetermined stage is occurring.
  • the minimum point on the VdQ / dV curve corresponds to the portion of the charge / discharge curve (QV curve) where the potential fluctuation is large. That is, it corresponds to the point where the battery reaction of a predetermined stage starts or ends.
  • V ⁇ dQ / dV curve data obtained by the dQ / dV calculation means 21 is sent to the slope calculation means 22.
  • the inclination calculation means 22 selects two extreme points out of a plurality of extreme points appearing on the V ⁇ dQ / dV curve, and the inclination of the straight line connecting the two selected extreme points. Is calculated.
  • the two extremum points can be selected arbitrarily. For example, two maximum points may be selected as the extremum points, two minimum points may be selected, or one maximum point and one minimum point may be selected. Further, the selected extremum points may be adjacent to each other or may have different extremum points in between.
  • the maximum point in the V-dQ / dV curve is a state in which the charge / discharge reaction of a certain stage is in progress, and the minimum point is a state in which the charge / discharge reaction is shifting from a certain stage to a different stage. It is preferable to select one maximum point and one minimum point having different reaction states as two extremum points.
  • One of the two extreme points may be, for example, a maximum point appearing in a voltage range of 3.6 V or more and 3.8 V or less. If there are multiple maxima within the voltage range, the largest main extremum is selected.
  • the maximum point P2 in FIG. 2 is within this voltage range.
  • the maximum point P2 is an extreme value point (maximum point) associated with the voltage stable region that appears second from the fully discharged state in the initial charge / discharge test of the secondary battery.
  • the initial term means a charge / discharge cycle within 10 times.
  • the maximum point P2 is, for example, an extreme value point associated with a voltage stable region based on the coexistence state of the stage 2L and the stage 2 in the graphite stage structure of the negative electrode.
  • the maximum point P2 frequently passes through in the general usage mode of the battery. Therefore, the maximum point P2 is easy to use for calculating the correction value, and if the maximum point P2 is selected as one of the two extreme value points, the correction frequency can be increased.
  • the minimum point B3 is an extreme value point (minimum point) associated with a voltage fluctuation region that appears third from the fully discharged state in the initial charge / discharge test of the secondary battery.
  • the minimum point B3 is a minimum point associated with the completion of the hexagonal single-phase reaction of nickel-cobalt-manganese oxide contained in the positive electrode active material of the secondary battery 10.
  • the minimum point B3 frequently passes through in the general usage mode of the battery. Therefore, the minimum point B3 is easy to use for calculating the correction value, and if the minimum point B3 is selected as one of the two extreme value points, the correction frequency can be increased.
  • the slope calculation means 22 obtains the slope of a straight line connecting two selected extreme points.
  • FIG. 3 is an example of a straight line connecting two extreme points Ea and Eb in the V ⁇ dQ / dV curve of the secondary battery.
  • the slope X obtained by the slope 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 slope X sent from the slope calculation means 22.
  • 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 slope calculated by the slope calculating means 22.
  • a and B are constants.
  • the constants A and B are obtained in advance from the relationship between the inclination of the calibration sample and the degree of deterioration of the calibration sample.
  • the constants A and B differ depending on the combination of extreme points selected by the slope calculation means 22.
  • 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.
  • FIG. 4 shows a V-dQ / dV curve that changes as the charge / discharge cycle of the calibration sample is repeated.
  • the V ⁇ dQ / dV curve in the initial state of the secondary battery is represented as 100, and the numerical value decreases as the secondary battery deteriorates.
  • the calibration sample deteriorates and the dQ / dV value at the extremum point changes.
  • the two extremum points selected in the calibration sample are the same as the two extremum points selected in the secondary battery 10 actually used. In other words, the secondary battery 10 actually used selects the two extremum points selected in the calibration sample as the two extremum points.
  • the slope connecting the two extreme points in the calibration sample is calculated every time the charge / discharge cycle is performed a predetermined number of times.
  • the degree of deterioration (SOH) of the calibration sample at the time when the inclination is obtained 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.
  • FIG. 5 shows the relationship between the degree of deterioration of the calibration sample and the slope of the straight line connecting the two extreme points.
  • 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 minimum points during charging.
  • the replacement with the correction value is performed every time the selected extreme value points 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. 6 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 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 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 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.
  • the control device 20 corrects by using the slopes of the two extreme points in the V ⁇ dQ / dV curve.
  • the slopes of the two extremum points include information on changes in the vertical axis (dQ / dV) direction of the extremum points whose positions change due to deterioration and information on changes in the horizontal axis (V) direction. Since the extreme point of the V-dQ / dV curve shifts in both the vertical axis (dQ / dV) direction and the horizontal axis (V) direction due to deterioration, the correction value is obtained using the value including two pieces of information. Therefore, the deteriorated state of the secondary battery 10 can be accurately grasped. As a result, when the control device 20 according to the present embodiment is used, the SOH of the secondary battery 10 can be accurately estimated.
  • the correction value may be obtained by using a value (parameter) that has an equivalent relationship with the slope connecting the two extremum points by mathematical conversion.
  • a value parameter
  • two points that are mathematically equivalent may be used instead of two extremum points.
  • the VdQ / dV curve is obtained by exchanging the X-axis and the Y-axis of the QV curve and differentiating Q with V. Therefore, each of the extremum points of dQ / dV is mathematically equivalent to the inflection point in a normal QV curve. Therefore, for example, even if two inflection points whose reciprocals of slopes are maximum or minimum in the QV curve are selected and the slope of the straight line connecting these two inflection points is used to calculate the correction value. good.
  • Example 1 A lithium ion secondary battery was produced as the secondary battery of Example 1.
  • a positive electrode was prepared.
  • NCA composition formula: Li 1.0 Ni 0.78 Co 0.19 Al 0.03 O 2
  • carbon black was prepared as the conductive material
  • PVDF polyvinylidene fluoride
  • 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 loading of the positive electrode active material layer 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 measured SOH and the estimated SOH were obtained.
  • the measured and estimated SOH was determined in 100 cycles, 200 cycles, and 300 cycles, respectively.
  • the condition of one charge / discharge was that at 25 ° C., the battery was charged to a final voltage of 4.4 V with a constant current corresponding to 0.1 C, and then discharged to 3.0 V with a constant current corresponding to 0.1 C.
  • 1C represents the current value for discharging the reference capacity of the battery in 1 hour
  • 0.1C represents the current value of 1/10 of the current value.
  • 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). Further, as described above, the estimated SOH may be a correction value obtained by using the inflection point in the QV curve. In this example, the extreme points of dQ / dV were used in order to capture the inflection point more clearly.
  • Example 1 the following two extremum points were selected as the two extremum points.
  • Point 1 Maximum point (P2) associated with the voltage stable region that appears second from the fully discharged state
  • Point 2 Maximum point (P3) associated with the voltage stable region that appears third from the fully discharged state
  • Point 1 is a maximum point that appears in the voltage range of 3.6 V or more and 3.8 V or less.
  • Point 2 is a maximum point that appears in the voltage range of 3.8 V or more and 4.1 V or less.
  • Examples 2 to 5 In Examples 2 to 5, the selection of the two extremum points is different from that in Example 1. Other conditions were the same as in Example 1.
  • Example 2 the following two extremum points were selected as the two extremum points.
  • Point 1 The minimum point (B2) associated with the voltage fluctuation region that appears second from the fully discharged state.
  • Point 2 The minimum point (B3) associated with the voltage fluctuation region that appears third from the fully discharged state.
  • Point 1 is a minimum point that appears in the voltage range of 3.7 V or more and 4.0 V or less.
  • Point 2 is a minimum point that appears in the voltage range of 3.9 V or more and 4.2 V or less.
  • Example 3 the following two extremum points were selected as the two extremum points.
  • Point 1 Maximum point (P2) associated with the voltage stable region that appears second from the fully discharged state
  • Point 2 The minimum point (B1) associated with the voltage fluctuation region that appears first from the fully discharged state.
  • Point 1 is a maximum point that appears in the voltage range of 3.6 V or more and 3.8 V or less.
  • Point 2 is a minimum point that appears in the voltage range of 3.5 V or more and 3.7 V or less.
  • Point 1 Maximum point (P2) associated with the voltage stable region that appears second from the fully discharged state
  • Point 2 The minimum point (B2) associated with the voltage fluctuation region that appears second from the fully discharged state.
  • Point 1 is a maximum point that appears in the voltage range of 3.6 V or more and 3.8 V or less.
  • Point 2 is a minimum point that appears in the voltage range of 3.7 V or more and 4.0 V or less.
  • Example 5 the following two extremum points were selected as the two extremum points.
  • Point 1 Maximum point (P2) associated with the voltage stable region that appears second from the fully discharged state
  • Point 2 The minimum point (B3) associated with the voltage fluctuation region that appears third from the fully discharged state.
  • Point 1 is a maximum point that appears in the voltage range of 3.6 V or more and 3.8 V or less.
  • Point 2 is a minimum point that appears in the voltage range of 3.9 V or more and 4.2 V or less.
  • Example 6 In Example 6, a mixture of LiNi 0.33 Mn 0.33 Co 0.33 O 2 (NCM) and LiMn 2 O 4 (LMO) was used as the positive electrode active material for the positive electrode of the lithium ion secondary battery. The point is different from Example 5. The ratio of NCM to LMO was 8: 2. Other conditions were the same as in Example 5.
  • NCM LiNi 0.33 Mn 0.33 Co 0.33 O 2
  • LMO LiMn 2 O 4
  • Comparative Example 1 Comparative Example 1 is different from Example 1 in that the inter-peak capacitance is used when the estimated SOH is obtained. Other conditions were the same as in Example 1.
  • the inter-peak capacity is a Q-dQ / dV curve in which dQ / dV, which is the ratio of the amount of change in the amount of electricity stored to the amount of change in the voltage of the secondary battery, is on the vertical axis and the amount of electricity stored in the secondary battery is on the horizontal axis.
  • the capacitance between the two peaks The position of the peak changes due to deterioration, and the width between peaks (capacity between peaks) also changes.
  • the estimated SOH is calculated from the relationship between the peak capacity and the SOH.
  • the two peaks used in the calculation of the inter-peak capacitance in Comparative Example 1 are the maximum point P2 and the maximum point P3.
  • the slopes of two extreme points including information on changes in the vertical axis (dQ / dV) direction and information on changes in the horizontal axis (V) direction of the extreme points whose positions change due to deterioration. It is thought that this is due to the use of.
  • 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.
  • the dQ / dV value at each voltage was obtained to obtain the V-dQ / dV curve, 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 0.2C, and the dQ / dV value at each voltage during charging is obtained to obtain V-dQ. Get the / dV curve.
  • the V-dQ / dV curves and SOH values in each of the three deteriorated states of the lithium ion secondary battery (hereinafter referred to as the first deteriorated state, the second deteriorated state, and the third deteriorated state) are obtained.
  • the V-dQ / dV curve in the first deteriorated state, the V-dQ / dV curve in the second deteriorated state, and the V-dQ / dV curve in the third deteriorated state are output, respectively, and the two poles are output.
  • the slope of the straight line connecting the value points was calculated.
  • Y AX + B

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Abstract

La présente invention concerne un dispositif de commande pour une batterie secondaire qui corrige un niveau de détérioration SOH de la batterie secondaire de telle sorte que (1) SOH = AX + B, X étant la pente d'une ligne droite reliant deux points extrêmes parmi une pluralité de points extrêmes exprimés par la courbe V-dQ/dV ou deux points qui sont mathématiquement équivalents à celle-ci et A et B sont des constantes obtenues à l'avance à partir de la relation entre X dans un échantillon d'étalonnage et le niveau de détérioration de l'échantillon d'étalonnage. Un bloc-batterie pourvu de ce dispositif de commande pour une batterie secondaire est très stable et contribue à une alimentation en énergie stable et à des cibles de développement durables.
PCT/JP2020/011031 2020-03-13 2020-03-13 Dispositif de commande pour batterie secondaire, bloc-batterie et procédé de commande pour batterie secondaire WO2021181650A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011036760A1 (fr) * 2009-09-25 2011-03-31 トヨタ自動車株式会社 Système de batterie secondaire
JP2019056595A (ja) * 2017-09-20 2019-04-11 三菱自動車工業株式会社 二次電池システム
JP2019078771A (ja) * 2017-07-19 2019-05-23 株式会社Ｇｓユアサ 推定装置、蓄電装置、推定方法、及びコンピュータプログラム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011036760A1 (fr) * 2009-09-25 2011-03-31 トヨタ自動車株式会社 Système de batterie secondaire
JP2019078771A (ja) * 2017-07-19 2019-05-23 株式会社Ｇｓユアサ 推定装置、蓄電装置、推定方法、及びコンピュータプログラム
JP2019056595A (ja) * 2017-09-20 2019-04-11 三菱自動車工業株式会社 二次電池システム

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