WO2011135631A1 - 満充電容量補正回路、充電システム、電池パック、及び満充電容量補正方法 - Google Patents
満充電容量補正回路、充電システム、電池パック、及び満充電容量補正方法 Download PDFInfo
- Publication number
- WO2011135631A1 WO2011135631A1 PCT/JP2010/003088 JP2010003088W WO2011135631A1 WO 2011135631 A1 WO2011135631 A1 WO 2011135631A1 JP 2010003088 W JP2010003088 W JP 2010003088W WO 2011135631 A1 WO2011135631 A1 WO 2011135631A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- full charge
- ratio
- secondary battery
- value
- charge capacity
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3828—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration
- G01R31/3832—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration without measurement of battery voltage
Definitions
- the present invention relates to a full charge capacity correction method for correcting a full charge capacity value of a secondary battery, and a full charge capacity correction circuit, a charging system, and a battery pack using the same.
- Electronic devices such as portable personal computers, digital cameras, video cameras, mobile phones, vehicles such as electric cars and hybrid cars, hybrid elevators, power systems that combine solar batteries and power generators with secondary batteries, Secondary batteries are widely used in various devices and systems such as battery-mounted devices and systems such as uninterrupted power supply devices.
- the usable remaining amount charged in the secondary battery is displayed or an alarm is issued before the battery runs out. ing.
- Patent Document 1 describes that the amount of stored electricity at the start of charging is determined from the battery voltage. Thus, the full charge capacity can be corrected even if the secondary battery is not completely discharged.
- the full charge capacity obtained by adding the amount of charged electricity from the start of charging until the secondary battery is fully charged to the amount of stored electricity (remaining charge starting capacity) at the start of charging also includes an error. There was an inconvenience.
- An object of the present invention is to provide a full charge capacity correction circuit, a charging system, a battery pack, which can improve the full charge capacity correction accuracy over the method described in Patent Document 1 while increasing the full charge capacity correction opportunities. And providing a full charge capacity correction method.
- a full charge capacity correction circuit includes an integration unit that calculates an integrated value by integrating current values of currents flowing through a secondary battery, and a full charge capacity that indicates the full charge capacity of the secondary battery.
- a capacity storage unit that stores a value, and an estimable condition that is a condition capable of estimating a power storage ratio that is a ratio of a stored power amount stored in the secondary battery to an actual full charge capacity of the secondary battery,
- a first estimating unit that estimates a power storage ratio of the secondary battery as a first power storage ratio when satisfied, and the power storage ratio can be estimated after the first power storage ratio is estimated by the first estimating unit.
- the first power storage by the first estimation unit A difference integrated value that is an integrated value accumulated by the accumulating unit from when the rate is estimated to when the second electricity storage ratio is estimated by the second estimating unit, the first electricity storage ratio, and the first Based on the difference between the two storage ratios and the ratio of 1, the full charge capacity value of the secondary battery is estimated, and the estimated full charge capacity value is stored in the capacity storage unit as a new full charge capacity value.
- a full charge capacity correction unit that corrects the full charge capacity value by setting the current to the secondary battery to determine that the open voltage is obtained as the terminal voltage of the secondary battery.
- the open-circuit voltage condition on the condition that the measured open-circuit determination value is below is used as the estimable condition, and when the open-circuit voltage condition is satisfied, the storage ratio of the secondary battery based on the terminal voltage of the secondary battery Estimate the opening
- a charging system includes the above-described full charge capacity correction circuit, and a charging unit that charges the secondary battery by applying a full charge voltage of the secondary battery to the full battery.
- the detection unit determines that the secondary battery is fully charged when a current flowing through the secondary battery during charging by the charging unit falls below a preset determination threshold.
- the battery pack according to one aspect of the present invention includes the above-described full charge capacity correction circuit and the secondary battery.
- the full charge capacity correction method includes an integration step of calculating an integrated value by integrating current values of currents flowing through the secondary battery, and an actual full charge capacity of the secondary battery.
- an estimable condition which is a condition for estimating a power storage ratio that is a ratio of the amount of stored electricity stored in the secondary battery, is satisfied, the power storage ratio of the secondary battery is estimated as a first power storage ratio.
- the first estimation step After estimating the first power storage ratio in the first estimation step and the first estimation step, it is monitored whether an estimable condition that is a condition for estimating the power storage ratio is satisfied, and the estimable condition Is satisfied, a second estimation step of estimating the storage ratio of the secondary battery at this time as a second storage ratio, and the first storage ratio is estimated in the first estimation step, and then the second In the estimation process 2 based on a difference integrated value that is an integrated value accumulated by the integrating step until a power storage ratio is estimated, and a ratio between the first power storage ratio and the difference between the second power storage ratio and 1.
- the estimable condition is an open-circuit voltage condition on condition that the flowing current is below a predetermined open-circuit determination value for determining that an open-circuit voltage is obtained as the terminal voltage of the secondary battery.
- FIG. 3 is a flowchart illustrating an example of an operation of a full charge capacity correction circuit illustrated in FIG. 1.
- 3 is a flowchart illustrating an example of an operation of a full charge capacity correction circuit illustrated in FIG. 1.
- 3 is a flowchart illustrating an example of an operation of a full charge capacity correction circuit illustrated in FIG. 1.
- 3 is a flowchart illustrating an example of an operation of a full charge capacity correction circuit illustrated in FIG. 1.
- 3 is a flowchart illustrating an example of an operation of a full charge capacity correction circuit illustrated in FIG. 1.
- 3 is a flowchart illustrating an example of an operation of a full charge capacity correction circuit illustrated in FIG. 1. It is explanatory drawing for demonstrating the correction method of the full charge capacity value FCC when an open ratio estimation part is used as a 1st estimation part, and a full charge ratio estimation part is used as a 2nd estimation part. It is explanatory drawing for demonstrating the correction method of the full charge capacity value FCC when an open ratio estimation part is used as a 1st estimation part, and a full charge ratio estimation part is used as a 2nd estimation part.
- FIG. 1 is a block diagram showing an example of the configuration of a battery pack 2 and a charging system 1 including a full charge capacity correction circuit 5 using a full charge capacity correction method according to an embodiment of the present invention.
- the charging system 1 shown in FIG. 1 is configured by combining a battery pack 2 and a device side circuit 3.
- the charging system 1 is a battery-equipped device system such as an electronic device such as a portable personal computer, a digital camera, or a mobile phone, or a vehicle such as an electric vehicle or a hybrid car.
- the device-side circuit 3 is, for example, a main body portion of these battery-mounted device systems, and the load circuit 34 is a load circuit that operates by supplying power from the battery pack 2 in these battery-mounted device systems.
- the battery pack 2 includes a secondary battery 4, a full charge capacity correction circuit 5, a current detection resistor 6, a temperature sensor 7, switching elements Q1 and Q2, and connection terminals 11, 12, and 13.
- the full charge capacity correction circuit 5 includes a control unit 50, a voltage detection unit 51, a current detection unit 52, a temperature detection unit 53, and a communication unit 54.
- the charging system 1 is not necessarily limited to one configured to be separable into the battery pack 2 and the device side circuit 3, and one full charge capacity correction circuit 5 may be configured in the entire charging system 1.
- the constituent elements of the full charge capacity correction circuit 5 may be shared by the battery pack 2 and the device side circuit 3.
- the secondary battery 4 does not need to be a battery pack.
- the full charge capacity correction circuit 5 may be configured as an in-vehicle ECU (Electric Control Unit).
- the device-side circuit 3 includes connection terminals 31, 32, 33, a load circuit 34, a charging unit 35, a communication unit 36, a control unit 37, and a display unit 38.
- the charging unit 35 is connected to power supply connection terminals 31 and 32, and the communication unit 36 is connected to the connection terminal 33.
- connection terminals 11, 12, 13 of the battery pack 2 and the connection terminals 31, 32, 33 of the device-side circuit 3 are connected to each other. It has become.
- the communication units 54 and 36 are communication interface circuits configured to be able to transmit / receive data to / from each other via the connection terminals 13 and 33.
- the charging unit 35 is a power supply circuit that supplies a current and a voltage according to a control signal from the control unit 37 to the battery pack 2 via the connection terminals 31 and 32.
- the charging unit 35 may be, for example, a power supply circuit that generates a charging current for the battery pack 2 from a commercial power supply voltage.
- a power generation device that generates power based on natural energy such as sunlight, wind power, or hydropower, an internal combustion engine, or the like
- a power generation device that generates power by motive power may be used.
- the display unit 38 for example, a liquid crystal display or an LED (Light Emitting Diode) is used.
- the device side circuit 3 is an electronic device such as a portable personal computer or a digital camera
- a display device such as a liquid crystal display provided in the electronic device may be used as the display unit 38.
- the control unit 37 is a control circuit configured using, for example, a microcomputer. Then, when the request instruction transmitted from the control unit 50 in the battery pack 2 by the communication unit 54 is received by the communication unit 36, the control unit 37 responds to the request instruction received by the communication unit 36. Is controlled to output the current and voltage corresponding to the request instruction transmitted from the battery pack 2 from the charging unit 35 to the connection terminals 11 and 12.
- connection terminal 11 is connected to the positive electrode of the secondary battery 4 via the switching element Q2 and the switching element Q1.
- the switching element Q1 and the switching element Q2 for example, a p-channel FET (Field Effect Transistor) is used.
- the cathode of the parasitic diode is directed to the secondary battery 4, and when it is turned off, only the current in the discharge direction of the secondary battery 4 is cut off.
- the switching element Q2 has a parasitic diode cathode in the direction of the connection terminal 11, and cuts off only the current in the charging direction of the secondary battery 4 when turned off.
- the switching elements Q1 and Q2 are normally turned on and are turned off at the time of abnormality to protect the secondary battery.
- connection terminal 12 is connected to the negative electrode of the secondary battery 4 through the current detection resistor 6, and the connection terminal 11 passes through the switching element Q 2, the switching element Q 1, the secondary battery 4, and the current detection resistor 6. Thus, a current path to the connection terminal 12 is configured.
- connection terminals 11, 12, 13, 31, 32, and 33 may be any terminals that electrically connect the battery pack 2 and the device side circuit 3, and may be electrodes, connectors, terminal blocks, or the like. It may be a wiring pattern such as a land or a pad.
- the current detection resistor 6 is a so-called shunt resistor for current detection, and converts the charging current and discharging current of the secondary battery 4 into voltage values.
- a current detection element such as a current transformer or a Hall element, or on-resistances of the switching elements Q1 and Q2 may be used.
- the temperature sensor 7 is configured by using a thermosensitive element such as a thermistor or a thermocouple, for example, and is disposed in close contact with the secondary battery 4 or in the vicinity of the secondary battery 4. Then, the temperature sensor 7 outputs a voltage signal indicating the temperature t of the secondary battery 4 to the temperature detection unit 53.
- a thermosensitive element such as a thermistor or a thermocouple
- the secondary battery 4 may be, for example, a single battery, for example, an assembled battery in which a plurality of secondary batteries are connected in series, for example, an assembled battery in which a plurality of secondary batteries are connected in parallel. Alternatively, an assembled battery in which series and parallel are combined and connected may be used.
- a lithium ion secondary battery is used as the secondary battery 4, for example.
- the secondary battery 4 is not limited to a lithium ion secondary battery, and various secondary batteries such as a nickel hydride secondary battery and a nickel cadmium secondary battery can be used.
- the open ratio estimation unit 503 and the voltage conversion ratio acquisition unit 505 which will be described later, estimate the SOC of the secondary battery 4 based on the terminal voltage value Vb of the secondary battery 4, a nickel metal hydride secondary battery or a nickel cadmium secondary A lithium ion secondary battery having a larger amount of change in terminal voltage with respect to a change in the remaining amount of the secondary battery 4 is more suitable as the secondary battery 4 than the battery.
- the voltage detection unit 51 is configured using, for example, an analog-digital converter, detects the terminal voltage (inter-terminal voltage) of the secondary battery 4, and outputs a signal indicating the terminal voltage value Vb to the control unit 50.
- the current detection unit 52 is configured by using, for example, an analog-digital converter, detects the voltage Vr between both ends of the current detection resistor 6, and outputs a current value Ic flowing through the secondary battery 4 as a signal indicating the voltage Vr. It outputs to the control part 50 as information to show. Further, the current detection unit 52 represents the information (voltage Vr) indicating the current value Ic by, for example, expressing the direction in which the secondary battery 4 is charged as a positive value and the direction in which the secondary battery 4 is discharged as a negative value. It has become.
- the control unit 50 acquires the current value Ic flowing through the secondary battery 4 by dividing the voltage Vr by the resistance value R of the current detection resistor 6.
- the current value Ic indicates a charging current of the secondary battery 4 as a positive value and a discharging current of the secondary battery 4 as a negative value.
- the temperature detection unit 53 is configured using, for example, an analog-digital converter, converts the voltage signal output from the temperature sensor 7 into a digital value, and outputs the digital value to the control unit 50 as a signal indicating the temperature t.
- FIG. 2 is a block diagram showing an example of the control unit 50 shown in FIG.
- the control unit 50 includes, for example, a CPU (Central Processing Unit) that executes predetermined arithmetic processing, a ROM (Read Only Memory) that stores a predetermined control program, and a RAM (Random Access Memory) that temporarily stores data.
- a capacity storage unit 509 and a table storage unit 510 configured using a ROM, and peripheral circuits thereof are configured.
- control unit 50 executes, for example, a control program stored in the ROM, so that the charge control unit 501 (full charge detection unit), the current integration unit 502 (integration unit), the open ratio estimation unit 503, the full charge ratio. It functions as an estimation unit 504, a voltage conversion ratio acquisition unit 505, a reference ratio estimation unit 506, a correction control unit 507, and a full charge capacity correction unit 508.
- the charging control unit 501 full charge detection unit
- the control unit notifies the user that the charging is about to start. 37.
- the charging control unit 501 controls the operation of the charging unit 35 by outputting an instruction signal requesting supply of a predetermined charging current or charging voltage to the device side circuit 3 via the communication unit 54. Then, the charging control unit 501 causes the charging unit 35 to execute, for example, CCCV (Constant Current Constant Voltage) charging.
- CCCV Constant Current Constant Voltage
- the charge control unit 501 executes CV charging (constant voltage charging) by outputting the full charge voltage of the secondary battery 4 from the charging unit 35, and is detected by the current detection unit 52 during the execution of CV charging.
- CV charging constant voltage charging
- the current value Ic falls below the determination threshold value Ie set in advance as the charging termination condition, it is determined that the secondary battery 4 is fully charged, and the charging operation by the charging unit 35 is terminated.
- the charge control unit 501 notifies the full charge ratio estimation unit 504 and the correction control unit 507 that the secondary battery 4 is fully charged.
- the determination threshold value Ie is set to about 0.05 It, for example.
- 1 It battery capacity (Ah) / 1 (h)) is such that when the nominal capacity value of the secondary battery is discharged at a current value of 1 It, the remaining capacity of the secondary battery becomes zero in one hour. Current value.
- the charge control unit 501 corresponds to an example of a full charge detection unit.
- the charge control part 501 is not restricted to the example which performs CCCV charge, You may charge using another charge system. Regardless of the charging method employed, the charging control unit 501 satisfies the charging termination condition in the charging method and the secondary battery 4 becomes fully charged when the secondary battery 4 is fully charged. May be used as long as it notifies the full charge ratio estimation unit 504 and the correction control unit 507 that the battery is fully charged.
- a full charge capacity value FCC (Full Charge Capacity) as an initial value is stored in advance when the battery pack 2 is shipped, for example.
- FCC Full Charge Capacity
- the initial value of the full charge capacity value FCC for example, a value measured by theoretical calculation or actual measurement is stored in advance. Further, the full charge capacity value FCC stored in the capacity storage unit 509 is appropriately corrected by the full charge capacity correction unit 508.
- the table storage unit 510 flows through the secondary battery 4 and an RSOC (Relativistic State Of Charge) which is a value representing the storage ratio, which is a ratio of the stored electricity amount to the actual full charge capacity of the secondary battery 4, as a percentage.
- RSOC Relativistic State Of Charge
- a lookup table LT that associates the current value Ic and the temperature t of the secondary battery with the terminal voltage value Vb of the secondary battery 4 is stored in advance.
- FIG. 3 is an explanatory diagram showing an example of the lookup table LT stored in the table storage unit 510 shown in FIG.
- FIG. 3A shows a correspondence relationship between the terminal voltage value Vb (V11a to V54a), the current value Ic, and the temperature t of the secondary battery 4 when the RSOC is 95%.
- FIG. 3B shows a correspondence relationship between the terminal voltage value Vb (V11b to V54b), the current value Ic of the secondary battery 4 and the temperature t of the secondary battery 4 when the RSOC is 50%. Yes.
- FIG. 3C shows a correspondence relationship between the terminal voltage value Vb (V11c to V54c), the current value Ic, and the temperature t of the secondary battery 4 when the RSOC is 5.5%.
- the look-up table LT shown in FIG. 3 is configured such that data experimentally measured using, for example, a new secondary battery 4 is stored in the ROM in advance.
- the look-up table LT corresponding to the RSOC of 95%, 50%, and 5.5% is illustrated, but the table storage unit 510 has the RSOC in the entire range of 0% to 100%.
- a corresponding lookup table LT is stored.
- the terminal voltage value Vb increases as the current value Ic increases due to the voltage generated by the internal resistance of the secondary battery 4. That is, the charging current increases during charging, and the terminal voltage value Vb increases as the current value Ic increases.
- the current in the discharge direction decreases and the absolute value of the negative current value Ic decreases, that is, the terminal voltage value Vb increases as the current value Ic increases (the amount of decrease in the terminal voltage value Vb). Less).
- the correspondence relationship between the RSOC of the secondary battery 4 and the terminal voltage value Vb varies depending on the temperature t. Generally, the higher the temperature t, the lower the terminal voltage value Vb corresponding to the same RSOC. Therefore, in FIGS. 3A, 3B, and 3C, under conditions where RSOC and current value Ic are equal, V * 1 *> V * 2 *> V * 3 *> V * 4 * (* Is an arbitrary character).
- the terminal voltage value Vb corresponding to the same RSOC may increase as the temperature t increases. Therefore, the relationship of V * 1 *, V * 2 *, V * 3 *, and V * 4 * in FIGS. 3A, 3B, and 3C is appropriately set according to the characteristics of the secondary battery 4. do it.
- the lookup table LT shown in FIG. 3 associates the RSOC, the terminal voltage value Vb, the current value Ic, and the temperature t of the secondary battery 4, but the lookup table LT is a secondary battery.
- the temperature t of 4 may not be included as a parameter. Further, the look-up table LT may not include the temperature t and the current value Ic as parameters.
- the current integrating unit 502 calculates the stored electricity amount charged in the secondary battery 4 as the stored electricity amount Q (integrated value) by integrating the current value Ic detected by the current detecting unit 52 every unit time. To do.
- the current value Ic is represented by a positive current in the direction in which the secondary battery 4 is charged and a negative current in the direction in which the secondary battery 4 is discharged. 4 is added, and the amount of discharged electricity discharged from the secondary battery 4 is subtracted to calculate the amount of stored electricity Q charged in the secondary battery 4.
- the control unit 50 calculates the ratio (percentage) of the stored electricity quantity Q to the full charge capacity value FCC stored in the capacity storage unit 509 as the RSOC.
- the RSOC obtained in this way is transmitted as the RSOC of the secondary battery 4 from the control unit 50 to the control unit 37, so that the RSOC of the secondary battery 4 is notified to the device side circuit 3. It has become.
- the open ratio estimation unit 503 detects the terminal voltage value Vb detected by the voltage detection unit 51 and the temperature detection when the absolute value of the current value Ic detected by the current detection unit 52 is lower than a preset open determination value Ith.
- the temperature t detected by the unit 53 is acquired.
- the open ratio estimation unit 503 determines that the combination of the acquired terminal voltage value Vb and the temperature t is associated with the terminal voltage value Vb and the temperature as a value when the current value Ic is 0 A in the lookup table LT.
- the RSOC associated with the matched combination is estimated as the storage ratio RSOCo of the secondary battery 4.
- the open ratio estimation unit 503 uses a condition where the absolute value of the current value Ic is lower than the open determination value Ith as the open voltage condition. In this case, the storage ratio RSOCo is acquired based on the open circuit voltage of the secondary battery 4, and the influence of the temperature t is reduced, so that the detection accuracy of the storage ratio RSOCo is improved.
- the open ratio estimation unit 503 As the terminal voltage value Vb increases, the power storage ratio RSOCo increases.
- the open ratio estimation part 503 is not restricted to the example which estimates the electrical storage ratio RSOCo using the terminal voltage value Vb and the temperature t, You may estimate using only the terminal voltage value Vb.
- the open determination value Ith is set in advance in order to determine that the open voltage is obtained as the terminal voltage value Vb of the secondary battery 4, that is, to determine that the current value Ic is substantially 0A.
- a value obtained by adding a detection error of the current detection unit 52 to 0 A can be used.
- a small current value such as a leakage current or standby current that flows when the user is not using the device-side circuit 3 and that does not substantially affect the terminal voltage value Vb is opened.
- the determination value Ith may be set.
- the release ratio estimation unit 503 When the correction control unit 507 sets the release ratio estimation unit 503 as the first estimation unit, the release ratio estimation unit 503 notifies the release ratio estimation unit 503 of the storage ratio RSOCo as the first storage ratio RSOCa. Further, when set as the second estimation unit by the correction control unit 507, the open ratio estimation unit 503 notifies the open ratio estimation unit 503 of the storage ratio RSOCo as the second storage ratio RSOCb.
- the open ratio estimation unit 503 estimates the storage ratio RSOCo based on the open voltage of the secondary battery 4, a reference ratio estimation unit that estimates the storage ratio RSOCr from the terminal voltage value Vb in a state in which a current flows through the secondary battery 4. Compared to 506, the estimation accuracy of the first power storage ratio RSOCa and the second power storage ratio RSOCb is improved.
- the full charge ratio estimation unit 504 When the correction control unit 507 sets the full charge ratio estimation unit 504 as the first estimation unit, the full charge ratio estimation unit 504 notifies the open ratio estimation unit 503 of the storage ratio RSOCf as the first storage ratio RSOCa. When the correction control unit 507 sets the full charge ratio estimation unit 504 as the second estimation unit, the full charge ratio estimation unit 504 notifies the open ratio estimation unit 503 of the storage ratio RSOCf as the second storage ratio RSOCb.
- the voltage conversion ratio acquisition unit 505 uses the terminal voltage value Vb detected by the voltage detection unit 51, the current value Ic detected by the current detection unit 52, and the temperature t detected by the temperature detection unit 53, to obtain a secondary The power storage ratio RSOCv of the battery 4 is estimated.
- the voltage conversion ratio acquisition unit 505 determines that the combination of the terminal voltage value Vb, the current value Ic, and the temperature t is the terminal voltage value Vb, the current value Ic, and the temperature t that are associated in the lookup table LT. If the combination substantially matches, the RSOC associated with the matched combination is estimated as the storage ratio RSOCv.
- the terminal voltage value Vb and the SOC are associated with each other so that the SOC of the secondary battery 4 increases as the terminal voltage value Vb increases. Increases the storage ratio RSOCv as the terminal voltage value Vb increases.
- the current value Ic increases with respect to the same RSOC, that is, the current value Ic increases in the charging direction, and the terminal voltage value Vb decreases as the absolute value of the current value Ic decreases in the discharging direction.
- the current value Ic and the terminal voltage value Vb are associated with each other so as to increase. Therefore, when the voltage conversion ratio acquisition unit 505 collates the current value Ic detected by the current detection unit 52 and the terminal voltage value Vb detected by the voltage detection unit 51 with the lookup table LT, the current value Ic increases.
- the power storage ratio RSOCv is estimated so as to decrease the power storage ratio RSOCv.
- the temperature t and the terminal voltage value Vb are associated so that the terminal voltage value Vb decreases as the temperature t increases with respect to the same SOC. Therefore, when the voltage conversion ratio acquisition unit 505 collates the temperature t detected by the temperature detection unit 53 and the terminal voltage value Vb detected by the voltage detection unit 51 with the lookup table LT, the voltage conversion ratio acquisition unit 505 stores power as the temperature t increases.
- the power storage ratio RSOCv is estimated so as to increase the ratio RSOCv.
- the voltage conversion ratio acquisition unit 505 can estimate the power storage ratio RSOCv with high accuracy.
- the values set in the lookup table LT are discrete values, whereas the terminal voltage value Vb detected by the voltage detection unit 51, the current value Ic detected by the current detection unit 52, and The temperature t detected by the temperature detector 53 changes continuously. Therefore, the open ratio estimation unit 503 and the voltage conversion ratio acquisition unit 505 perform an approximation process such as rounding the terminal voltage value Vb, current value Ic, and temperature t, for example, rounding off or rounding off, and then performing a lookup table. Matching with LT. “Substantially match” includes the case where the terminal voltage value Vb, the current value Ic, and the temperature t are matched as a result of approximation processing such as rounding off or rounding off, for example. Meaning.
- the voltage conversion ratio acquisition unit 505 is not limited to the example in which the power storage ratio RSOCv is estimated using the terminal voltage value Vb, the current value Ic, and the temperature t, and may be estimated using only the terminal voltage value Vb.
- the terminal voltage value Vb and the current value Ic may be used for estimation, or the power storage ratio RSOCv may be estimated using the terminal voltage value Vb and the temperature t.
- the reference ratio estimation unit 506 is based on the condition that the storage ratio RSOCv estimated by the voltage conversion ratio acquisition unit 505 becomes a preset reference value Ref. Then, the reference ratio estimation unit 506 estimates that the storage ratio RSOCr of the secondary battery 4 is equal to the storage ratio RSOCv, that is, the reference value Ref, when the storage ratio RSOCv becomes equal to the reference value Ref.
- the secondary battery has a first range in which the change amount of the terminal voltage value Vb with respect to a change in the storage ratio RSOC is a large region and a second range that is a small region. Then, in the second range, the storage ratio RSOCv estimated based on the terminal voltage value Vb by the voltage conversion ratio acquisition unit 505 is the storage ratio estimated based on the terminal voltage value Vb in the first range. Less accurate than RSOCv.
- the reference value Ref it is desirable to set the reference value Ref to a value selected from the power storage ratios belonging to the first range because the accuracy of estimation of the power storage ratio RSOCv by the voltage conversion ratio acquisition unit 505 is improved.
- the region where the RSOC is 10% or less is the first range where the amount of change in the terminal voltage value Vb with respect to the change in the storage ratio RSOC is a large region. Therefore, it is desirable to use a value in the first range, for example, 5.5% as the reference value Ref.
- the reference ratio estimation unit 506 When set as the first estimation unit by the correction control unit 507, the reference ratio estimation unit 506 notifies the open ratio estimation unit 503 of the storage ratio RSOCr as the first storage ratio RSOCa. Further, when set as the second estimation unit by the correction control unit 507, the reference ratio estimation unit 506 notifies the open ratio estimation unit 503 of the storage ratio RSOCr as the second storage ratio RSOCb.
- the correction control unit 507 When any one of the open circuit voltage condition of the open ratio estimation unit 503, the full charge condition of the full charge ratio estimation unit 504, and the reference condition of the reference ratio estimation unit 506 is satisfied, the correction control unit 507 satisfies the satisfied condition An estimation unit using is set as the first estimation unit.
- the correction control unit 507 sets either the full charge ratio estimation unit 504 or the reference ratio estimation unit 506 as the second estimation unit, When one of the full charge ratio estimation unit 504 and the reference ratio estimation unit 506 is set as the first estimation unit, the open ratio estimation unit 503 is set as the second estimation unit.
- the correction control unit 507 By setting the estimation unit used as the estimation unit as the first estimation unit and setting the estimated second storage ratio RSOCb as the first storage ratio RSOCa, a new first storage ratio RSOCa is estimated. As a result, the estimation of a new full charge capacity value FCC is started again. Thereby, the correction control unit 507 continuously repeats the correction of the full charge capacity value FCC.
- the full charge capacity correction unit 508 is integrated by the current integration unit 502 between the time when the first power storage ratio RSOCa is estimated by the first estimation unit and the time when the second power storage ratio RSOCb is estimated by the second estimation unit.
- the integrated value is acquired as the differential integrated value Qd.
- the full charge capacity correction unit 508 estimates the first power storage ratio RSOCa by the first estimation unit from the integrated value accumulated by the current integration unit 502 when the second power storage ratio RSOCb is estimated by the second estimation unit, for example.
- the difference integrated value Qd is calculated by subtracting the integrated value at that time.
- the accumulated value accumulated by current accumulating unit 502 between the time when first power storage ratio RSOCa is estimated by first estimating unit and the time when second power storage ratio RSOCb is estimated by second estimating unit is the difference accumulated. It only needs to be integrated as the value Qd. Accordingly, the battery may be charged or discharged during this period, and does not necessarily need to be continuously discharged or continuously charged.
- another current integration unit is provided for full charge capacity correction, and the first estimation is performed using this current integration unit. Even if the difference accumulated value Qd is acquired by causing the current value Ic to be accumulated between the time when the first power storage ratio RSOCa is estimated by the unit and the time when the second power storage ratio RSOCb is estimated by the second estimating unit. Good.
- the full charge capacity correction unit 508 has a first power storage ratio Ra representing the ratio represented by the first power storage ratio RSOCa obtained by the first estimation unit, and a second ratio represented by the second power storage ratio RSOCb obtained by the second estimation unit. Based on the following formula (1), a new full charge capacity value FCCN is calculated as the power storage ratio Rb.
- the full charge capacity correction unit 508 corrects the full charge capacity value FCC by storing the full charge capacity value FCCN thus obtained in the capacity storage unit 509 as a new full charge capacity value FCC. .
- the full charge capacity correction unit 508 may correct the full charge capacity value FCC by the following difference correction method instead of correcting the full charge capacity value FCC based on the above formula (1).
- the full charge capacity correction unit 508 as a difference correction method, multiplies the difference value by the multiplication value obtained by multiplying the full charge capacity value FCCO before correction stored in the capacity storage unit 509 and the first power storage ratio Ra.
- the first electric quantity QF which is an addition value with the value Qd, is calculated using the following equation (2).
- the full charge capacity correction unit 508 calculates a second electric quantity QS, which is a product of the full charge capacity value FCCO and the second power storage ratio, using the following equation (3).
- the full charge capacity correction unit 508 calculates the new full charge capacity value FCCN based on the following formula (4), and Ra ⁇ Rb and QF> QS. Then, the new full charge capacity value FCCN is calculated based on the following formula (5), and when Ra> Rb and QF ⁇ QS, the new full charge capacity value FCCN is calculated based on the following formula (5). When Ra> Rb and QF> QS, the new full charge capacity value FCCN is calculated based on the following equation (4).
- FCCN FCCO- ⁇
- FCCN FCCO + ⁇
- the full charge capacity correction unit 508 sets FCCO ⁇ Ra as the stored electricity quantity Q of the current integration unit 502, and the current integration unit 502 If the current value Ic is continuously accumulated with respect to the stored electricity amount Q, the stored electricity amount Q when the second storage ratio Rb is estimated by the second estimation unit is used as the first electricity amount QF as it is. Therefore, processing can be simplified.
- the value of the stored electricity amount Q is used as an estimated value (detected value) of the stored electricity amount of the secondary battery 4, when the first storage ratio Ra is estimated by the first estimating unit, FCCO ⁇ Ra Is set as the stored electricity quantity Q, the accuracy of estimating the stored electricity quantity of the secondary battery 4 can be improved.
- first power storage ratio Ra and the first power storage ratio RSOCa, the second power storage ratio Rb and the second power storage ratio RSOCb represent the same ratio only by different ratio representation methods.
- the storage ratios and the second storage ratios are equivalent to each other. Therefore, “100 / (RSOCb-RSOCa)” may be used instead of “1 / (Rb-Ra)” in the formula (1), and “1 /
- 4 to 8 are flowcharts showing an example of the operation of the full charge capacity correction circuit 5 shown in FIG. 1
- the current detection unit 52 detects the current value Ic flowing through the secondary battery 4, the voltage detection unit 51 detects the terminal voltage value Vb, and the temperature detection unit 53 detects the temperature t (step S1).
- the current integration unit 502 integrates the current value Ic every unit time, and calculates the stored electricity quantity Q charged in the secondary battery 4 (step S2).
- the storage ratio RSOCv is estimated and acquired from the current value Ic, the terminal voltage value Vb, and the temperature t by the voltage conversion ratio acquisition unit 505 (step S3).
- Steps S1 to S3 are always executed in parallel with the following processing so that the current value Ic, the terminal voltage value Vb, the temperature t, the stored electricity quantity Q, and the stored electricity ratio RSOCv are constantly updated to the latest values. It has become.
- the correction control unit 507 compares the absolute value of the current value Ic with the open determination value Ith (step S4), and the open circuit voltage condition is confirmed. If the absolute value of the current value Ic is equal to or greater than the open determination value Ith and the open circuit voltage condition is not satisfied (NO in step S4), the correction control unit 507 confirms whether or not the charge control unit 501 has notified full charge. The full charge condition is confirmed (step S5).
- step S5 If there is no full charge notification from the charge control unit 501 and the full charge condition is not satisfied (NO in step S5), the correction control unit 507 compares the power storage ratio RSOCv with the reference value Ref, and the reference condition is Confirmed (step S6). If the storage ratio RSOCv and the reference value Ref do not match and the reference condition is not satisfied, the process proceeds to step S4.
- steps S4 to S6 are repeated until any one of the open-circuit voltage condition, the full charge condition, and the reference condition is satisfied.
- the open ratio estimation unit 503 is set as the first estimation unit by the correction control unit 507. Then, the process proceeds to step S7.
- the stored electricity quantity Q when the open circuit voltage condition is satisfied is stored in the RAM, for example, in the RAM, for example, by the correction control unit 507 (step S7).
- the storage ratio RSOCo is estimated from the terminal voltage value Vb that is the open circuit voltage (OCV: (Open circuit voltage)) of the secondary battery 4 and the temperature t by the open circuit ratio estimation unit 503 (step S8). Further, the storage ratio RSOCo is set as the first storage ratio RSOCa by the opening ratio estimation unit 503. Since the power storage ratio RSOCo represents the ratio as a percentage, a value obtained by converting this to the ratio is set as the first power storage ratio Ra (step S9).
- the first storage ratio Ra of the secondary battery 4 when the open-circuit voltage condition is satisfied is estimated by the open-circuit ratio estimation unit 503 based on the open-circuit voltage of the secondary battery 4, the first storage ratio Ra Is a highly accurate estimated value of the electricity storage ratio.
- steps S4 to S6 processing similar to steps S4 to S6 is executed by the correction control unit 507 in steps S21 to S23, and any one of the open-circuit voltage condition, the full charge condition, and the reference condition is satisfied again in step S21. To S23 are repeated.
- the correction control unit 507 sets the open ratio estimation unit 503 as the second estimation unit. Then, the process proceeds to step S24.
- step S21 the stored electricity quantity Q when the open-circuit voltage condition is satisfied in step S21 is stored by the correction control unit 507, for example, in the RAM as the integrated value Q (2) (step S24).
- the storage ratio RSOCo is estimated by the open ratio estimation unit 503 from the terminal voltage value Vb that is the open circuit voltage of the secondary battery 4 and the temperature t (step S25). Further, the storage ratio RSOCo is set as the second storage ratio RSOCb by the opening ratio estimation unit 503. Since the storage ratio RSOCo represents the ratio as a percentage, a value obtained by converting this to the ratio is set as the second storage ratio Rb (step S26).
- the second storage ratio Rb of the secondary battery 4 when the open-circuit voltage condition is satisfied is estimated by the open-circuit ratio estimation unit 503 based on the open-circuit voltage of the secondary battery 4, the second storage ratio Rb Is a highly accurate estimated value of the electricity storage ratio.
- step S27 As a preparation for repeating the correction of the full charge capacity value FCC after the correction of the full charge capacity value FCC described later by the correction control unit 507, the open ratio estimation unit 503 used as the second estimation unit is A new first estimation unit is set (step S27), and the process proceeds to step S41.
- the estimation unit already used as the second estimation unit corresponds to the positioning of the first estimation unit in the next correction process.
- step S41 the correction control unit 507 subtracts the integrated value Q (1) from the integrated value Q (2) to calculate a differential integrated value Qd (step S41). Then, the difference integrated value Qd is stored in the secondary battery 4 during a period from when the secondary battery 4 satisfies the open-circuit voltage condition in step S4 to when the open-circuit voltage condition is satisfied again in step S21 after charging and discharging. This is the amount of change of the amount Q.
- the full charge capacity correction unit 508 uses the formula (1) to calculate the full charge capacity value FCCN based on the first power storage ratio Ra, the second power storage ratio Rb, and the difference integrated value Qd thus obtained. Is calculated (step S42). Then, the full charge capacity correction unit 508 corrects the full charge capacity value FCC by causing the capacity storage unit 509 to store the full charge capacity value FCCN as a new full charge capacity value FCC (step S43).
- Equation (1) calculates a new full charge capacity value FCCN based on the difference accumulated amount Qd, the first power storage ratio Ra, and the second power storage ratio Rb obtained regardless of the full charge capacity before correction. Therefore, the new correction value does not include an error of the full charge capacity before correction. As a result, the full charge capacity correction unit 508 can improve the correction accuracy of the full charge capacity value FCC as compared with the method described in Patent Document 1.
- the open ratio estimation unit 503 since the open ratio estimation unit 503 has higher accuracy of estimating the storage ratio than the reference ratio estimation unit 506, the open ratio estimation unit 503 is used as the first and second estimation units in this way. In this case, the correction accuracy of the full charge capacity value FCC is improved as compared with the case where one of the first power storage ratio Ra and the second power storage ratio Rb is estimated by the reference ratio estimation unit 506.
- the second power storage ratio Rb is set as the first power storage ratio Ra
- the integrated value Q (1) is set to the integrated value Q (2 ) (Step S44), and the process proceeds to step S21 again.
- steps S21 to S23 are repeated until any one of the open-circuit voltage condition, the full charge condition, and the reference condition is satisfied again by the correction control unit 507.
- the correction control unit 507 sets the full charge ratio estimation unit 504 as the second estimation unit,
- the stored electricity quantity Q when the charging condition is satisfied is acquired as the integrated value Q (2) (step S28).
- the full charge ratio estimation unit 504 estimates that the second power storage ratio Rb is “1” and the second power storage ratio RSOCb is 100% (step S29). Then, as a preparation for repeating the correction of the full charge capacity value FCC after the correction of the full charge capacity value FCC described later by the correction control unit 507, the full charge ratio estimation unit 504 used as the second estimation unit is A new first estimation unit is set (step S30), and the process proceeds to step S61.
- step S31 when steps S21 to S23 are repeated, if the storage ratio RSOCv matches the reference value Ref and the reference condition is satisfied (YES in step S23), the correction control unit 507 causes the reference ratio estimation unit 506 is set in the second estimation unit, and the stored electricity quantity Q when the reference condition is satisfied is acquired as the integrated value Q (2) (step S31).
- the reference ratio estimating unit 506 sets the second storage ratio RSOCb to the reference value Ref (%). Since the reference value Ref (%) represents the ratio as a percentage, a value obtained by converting this to the ratio is set as the second power storage ratio Rb (step S32).
- the reference ratio estimation unit 506 used as the second estimation unit is newly added. 1 is set as an estimation unit (step S33), and the process proceeds to step S51.
- steps S51 to S54 processing similar to that in steps S41 to S44 is executed to correct the full charge capacity value FCC, and as preparation for continuously repeating the correction of the full charge capacity value FCC.
- the second power storage ratio Rb is set as the first power storage ratio Ra
- the integrated value Q (1) is set as the integrated value Q (2), and the process proceeds from step S54 to step S61.
- step S52 as in step S42, the full charge capacity correction unit 508 can improve the correction accuracy of the full charge capacity value FCC as compared with the method described in Patent Document 1.
- step S61 the full charge ratio estimation unit 504 and the reference ratio estimation unit 506 are used as the first estimation unit or the first estimation unit newly set as the first estimation unit from the second estimation unit.
- the first power storage ratio Ra the first power storage ratio Ra reset from the second power storage ratio Rb is set). Including
- step S61 in order to always set the open ratio estimation unit 503 as the second estimation unit, step S61 is repeated until the open circuit voltage condition is satisfied.
- the open ratio estimation unit 503 is always used as the second estimation unit. ing. Therefore, the open ratio estimation unit 503 is always used as at least one of the first estimation unit and the second estimation unit.
- the full charge ratio estimation unit 504 cannot estimate the first power storage ratio Ra and the second power storage ratio Rb unless the secondary battery 4 is fully charged, the first power storage ratio Ra and the second power storage ratio There are few opportunities to estimate Rb, so there are few opportunities to correct the full charge capacity value FCC.
- the reference ratio estimation unit 506 is lower in estimation accuracy of the first power storage ratio Ra and the second power storage ratio Rb than the open ratio estimation unit 503. Therefore, when the reference ratio estimation unit 506 is used, the full charge is achieved. The correction accuracy of the capacitance value FCC is reduced.
- the reference ratio estimation unit 506 also sets the first power storage ratio Ra and the power storage ratio RSOCv of the secondary battery 4 unless the user discharges the secondary battery 4 until the reference value Ref set to, for example, 10% or less. Since the second power storage ratio Rb cannot be estimated, there are few opportunities for estimating the first power storage ratio Ra and the second power storage ratio Rb, and therefore there are few opportunities for correcting the full charge capacity value FCC.
- the open ratio estimation unit 503 for example, when the user turns off the power switch of the device and the charge / discharge current of the secondary battery 4 becomes substantially zero, the first storage ratio Ra and the second The power storage ratio Rb can be estimated. Therefore, the open ratio estimation unit 503 has more estimation opportunities for the first power storage ratio Ra and the second power storage ratio Rb than the full charge ratio estimation unit 504 and the reference ratio estimation unit 506. Moreover, the open ratio estimation unit 503 has higher estimation accuracy of the first power storage ratio Ra and the second power storage ratio Rb than the reference ratio estimation unit 506.
- step S61 by using the open ratio estimation unit 503 as at least one of the first estimation unit and the second estimation unit, the reference ratio estimation unit 506 increases the chances of correcting the full charge capacity value FCC.
- the correction accuracy of the full charge capacity value FCC can be improved as compared with the case where the first power storage ratio Ra and the second power storage ratio Rb are estimated.
- step S61 When the absolute value of the current value Ic becomes smaller than the open determination value Ith and the open circuit voltage condition is satisfied (YES in step S61), the open ratio estimation unit 503 is set as the second estimation unit by the correction control unit 507. Then, the process proceeds to step S62. Thereafter, processes similar to steps S24 to S27 are executed in steps S62 to S65, and processes similar to steps S41 to S44 are executed in steps S66 to S69.
- the full charge capacity value FCC is corrected, and as a preparation for continuously repeating the correction of the full charge capacity value FCC, the second power storage ratio Rb is set as the first power storage ratio Ra, and the integrated value Q (1) is set as the integrated value Q (2), and the process proceeds from step S69 to step S21 again.
- step S67 as in step S42, the full charge capacity correction unit 508 can improve the correction accuracy of the full charge capacity value FCC as compared with the method described in Patent Document 1.
- steps S27 and S44 may not be executed and the process may proceed from step S43 to step S1.
- steps S30, S33, and S54 may not be executed, and the process may proceed from step S53 to step S1.
- steps S65 and S69 may not be executed, and the process may proceed from step S68 to step S1.
- Step S10 when steps S4 to S6 are repeated to monitor the open-circuit voltage condition, the full charge condition, and the reference condition, a notification of full charge is received from the charge control unit 501, and the full charge condition is satisfied ( YES in step S5), the correction control unit 507 sets the full charge ratio estimation unit 504 as the first estimation unit, and the stored electricity amount Q when the full charge condition is satisfied is acquired as the integrated value Q (1). (Step S10).
- step S11 the full charge ratio estimation unit 504 estimates that the first power storage ratio Ra is “1” and the first power storage ratio RSOCa is 100% (step S11). The process proceeds to step S61.
- step S6 when steps S4 to S6 are repeated, if the storage ratio RSOCv matches the reference value Ref and the reference condition is satisfied (YES in step S6), the correction control unit 507 causes the reference ratio estimation unit 506 is set in the first estimation unit, and the stored electricity quantity Q when the reference condition is satisfied is acquired as the integrated value Q (1) (step S12).
- the reference ratio estimation unit 506 sets the first storage ratio RSOCa to the reference value Ref (%). Since the reference value Ref (%) represents the ratio as a percentage, a value obtained by converting the ratio into the ratio is set as the first power storage ratio Ra (step S13), and the process proceeds to step S61.
- step S61 Since the operation after step S61 is as described above, its description is omitted.
- FIGS. 9 and 10 are for explaining a method of correcting the full charge capacity value FCC when the open ratio estimation unit 503 is used as the first estimation unit and the full charge ratio estimation unit 504 is used as the second estimation unit. It is explanatory drawing of. 9 and 10, the vertical axis indicates the RSOC of the secondary battery 4, and the horizontal axis indicates the passage of time. FIG. 9 shows an example where the full charge capacity value FCC is corrected in the negative direction, and FIG. 10 shows an example where the full charge capacity value FCC is corrected in the positive direction.
- the open-circuit voltage condition is satisfied, and the open-circuit ratio estimation unit 503 estimates that the first power storage ratio Ra is 0.2 (the first power storage ratio RSOCa is 20%). .
- the full charge capacity value FCCO is 4000 mAh.
- the full charge condition is satisfied, and the full charge ratio estimation unit 504 estimates that the second power storage ratio Rb is 1 (the second power storage ratio RSOCb is 100%) (point B1).
- the difference integrated value Qd is assumed to be 3000 mAh.
- FCCN 4000- ⁇
- ) ⁇ 3750 mAh It becomes.
- the RSOC (RSOC notified to the device side circuit 3) calculated by the control unit 50 using the equation (A) is B2 points. To B1 point.
- the process of changing the RSOC according to the correction of the full charge capacity value FCC in this way is referred to as a JUMP process.
- point A at timing T1 is the same as point A in FIG.
- the full charge condition is satisfied, and the full charge ratio estimation unit 504 estimates that the second power storage ratio Rb is 1 (the second power storage ratio RSOCb is 100%) (point B1).
- the difference integrated value Qd is 3400 mAh.
- FCCN 4000 + ⁇
- ) ⁇ 4250 mAh It becomes.
- the RSOC calculated by the control unit 50 using the formula (A) at timing T3 exceeds 100%. However, since the RSOC never exceeds 100%, the control unit 50 notifies the device side circuit 3 of the period from the timing T3 to the timing T2 while fixing the RSOC to 100%.
- the process of fixing the RSOC value notified to the device side circuit 3 to 100% in this way is referred to as a KEEP process.
- the full charge capacity value FCCO before correction is used to calculate the full charge capacity value FCCN, but as a result, errors included in the full charge capacity value FCCO are canceled.
- the same full charge capacity value FCCN as that obtained when Expression (1) is used is obtained. Therefore, even when the difference correction method is used, the same correction value as that obtained when the equation (1) is used is obtained. Therefore, the full charge capacity correction unit 508 is more effective than the method described in Patent Document 1. The correction accuracy of the full charge capacity value FCC can be improved.
- FIGS. 11 and 12 illustrate a method for correcting the full charge capacity value FCC when the open ratio estimation unit 503 is used as the first estimation unit and the reference ratio estimation unit 506 is used as the second estimation unit. It is explanatory drawing. 11 and 12, the vertical axis represents the RSOC of the secondary battery 4, and the horizontal axis represents the passage of time. FIG. 11 shows an example where the full charge capacity value FCC is corrected in the negative direction, and FIG. 12 shows an example where the full charge capacity value FCC is corrected in the positive direction.
- the open circuit voltage condition is satisfied, and the open ratio estimating unit 503 sets the first power storage ratio Ra to 0.6 (the first power storage ratio RSOCa is 60%). Presumed. It is assumed that the full charge capacity value FCCO is 4000 mAh.
- the difference integrated value Qd is ⁇ 2000 mAh.
- FCCN 4000 ⁇ ⁇
- ) ⁇ 3670 mAh It becomes.
- the JUMP process is executed at timing T5.
- point C at timing T4 is the same as point C in FIG.
- the difference integrated value Qd is assumed to be ⁇ 2360 mAh.
- FCCN 4000 + ⁇
- ) ⁇ 4330 mAh It becomes.
- the KEEP process is executed at timings T6 to T5.
- the full charge capacity correction unit 508 can improve the correction accuracy of the full charge capacity value FCC as compared with the method described in Patent Document 1.
- FIG. 13 and 14 are explanatory diagrams for explaining a method of correcting the full charge capacity value FCC when the open ratio estimating unit 503 is used as the first and second estimating units.
- the vertical axis indicates the RSOC of the secondary battery 4
- the horizontal axis indicates the passage of time.
- FIG. 13 shows an example where the full charge capacity value FCC is corrected in the negative direction
- FIG. 14 shows an example where the full charge capacity value FCC is corrected in the positive direction.
- the open circuit voltage condition is satisfied, and the first power storage ratio Ra is estimated to be 0.6 (the first power storage ratio RSOCa is 60%) by the open ratio estimation unit 503. It is assumed that the full charge capacity value FCCO is 4000 mAh.
- the open-circuit voltage condition is satisfied, and the open-circuit ratio estimation unit 503 estimates that the second power storage ratio Rb is 0.1 (the second power storage ratio RSOCb is 10%) (point F1).
- the difference integrated value Qd is ⁇ 1800 mAh.
- FCCN 4000 ⁇ ⁇
- ) ⁇ 3600 mAh It becomes.
- the JUMP process is executed at timing T8.
- point E at timing T7 is the same as point E in FIG.
- the open circuit voltage condition is satisfied, and the open ratio estimating unit 503 estimates that the second storage ratio Rb is 0.1 (second storage ratio RSOCb is 10%) (point F1).
- the difference integrated value Qd is ⁇ 2200 mAh.
- FCCN 4000 + ⁇
- ) ⁇ 4400 mAh It becomes.
- the JUMP process is executed at timing T8.
- the full charge capacity correction unit 508 can improve the correction accuracy of the full charge capacity value FCC as compared with the method described in Patent Document 1.
- the open ratio estimation part 503 the full charge ratio estimation part 504, and the reference
- the ratio estimation unit 504 may be provided, the open ratio estimation unit 503 may be used as one of the first estimation unit and the second estimation unit, and the full charge ratio estimation unit 504 may be used as the other estimation unit.
- the full charge ratio estimation unit 504 is not provided, the open ratio estimation unit 503 and the reference ratio estimation unit 506 are provided, and the open ratio estimation unit 503 is used as one of the first estimation unit and the second estimation unit, and the other The reference ratio estimation unit 506 may be used as the estimation unit.
- full charge ratio estimation unit 504 and the reference ratio estimation unit 506 may not be provided, and the full charge ratio estimation unit 504 may be used as the first estimation unit and the second estimation unit.
- the estimation unit used in combination with the open ratio estimation unit 503 is not limited to the full charge ratio estimation unit 504 and the reference ratio estimation unit 506, and estimates the storage ratio of the secondary battery 4 by other methods. Also good.
- the full charge capacity correction circuit integrates the current value of the current flowing through the secondary battery to calculate an integrated value and a full charge capacity indicating the full charge capacity of the secondary battery.
- a capacity storage unit that stores a charge capacity value, and an estimable condition that is a condition for estimating a power storage ratio that is a ratio of a stored power amount stored in the secondary battery to an actual full charge capacity of the secondary battery Is satisfied, a first estimation unit that estimates a power storage ratio of the secondary battery as a first power storage ratio, and after the first power storage ratio is estimated by the first estimation unit, the power storage ratio is estimated.
- a second estimation unit that monitors whether or not an estimable condition that is a possible condition is satisfied, and estimates the storage ratio of the secondary battery at this time as a second storage ratio when the estimable condition is satisfied
- the difference accumulated value that is an accumulated value accumulated by the accumulating unit between the estimation of the electricity storage ratio and the estimation of the second electricity storage ratio by the second estimating unit, the first electricity storage ratio, and the A full charge capacity value of the secondary battery is estimated based on the difference between the second power storage ratio difference and the ratio of 1, and the estimated full charge capacity value is stored in the capacity storage unit as a new full charge capacity value.
- a full charge capacity correction unit that corrects a full charge capacity value by storing the current and the current flowing through the secondary battery is in a state in which an open voltage is obtained as a terminal voltage of the secondary battery.
- An open-circuit voltage condition that is set to be below a set open-circuit determination value is used as the presumable condition, and when the open-circuit voltage condition is satisfied, the secondary battery is charged based on the terminal voltage of the secondary battery.
- Estimate ratio That comprises an open ratio estimation unit, as at least one of the first estimator and the second estimator, a correction control unit configured to set the opening ratio estimator.
- the storage ratio of the secondary battery is estimated as the first storage ratio by the first estimation unit.
- the second estimation unit monitors whether an estimable condition that is the same as or different from the estimation condition is satisfied, and the estimable condition is satisfied. Then, the storage ratio of the secondary battery at this time is estimated as the second storage ratio.
- the difference between the first power storage ratio and the second power storage ratio is caused by the amount of electricity corresponding to the difference integrated value.
- the full charge capacity value corresponds to the ratio “1”, that is, 100%. Therefore, the full charge capacity correction unit determines the secondary battery based on the difference between the first power storage ratio and the second power storage ratio and the ratio of 1 corresponding to the full charge capacity value and the difference integrated value.
- the full charge capacity value can be estimated.
- the full charge capacity correction unit can correct the full charge capacity value without being affected by errors included in the full charge capacity value before correction by estimating the corrected full charge capacity value in this way. As a result, the correction accuracy of the full charge capacity can be improved as compared with the method described in Patent Document 1.
- the open ratio estimation unit estimates the storage ratio of the secondary battery based on the terminal voltage of the secondary battery when the open voltage condition is satisfied, that is, the open voltage of the secondary battery. Since the open voltage of the secondary battery is the electromotive force of the secondary battery itself, and the electromotive force of the secondary battery is determined according to the storage ratio of the secondary battery, the open ratio that estimates the storage ratio based on the open circuit voltage The estimation unit can accurately estimate the storage ratio of the secondary battery.
- the open circuit voltage condition in which the current flowing through the secondary battery is lower than the open determination value is highly likely to be satisfied, for example, when a user turns off a switch of a device using the secondary battery. Therefore, it is considered that there are more opportunities for the open-circuit voltage condition to be satisfied than for the opportunity for the secondary battery to be fully charged or completely discharged.
- the correction control unit by setting the correction control unit to use an open ratio estimation unit that satisfies the open circuit voltage condition as at least one of the first estimation unit and the second estimation unit, The estimation opportunity can be increased. And if the estimation opportunity of an electrical storage ratio increases, the correction opportunity of a full charge capacity can be increased. As a result, it is possible to improve the correction accuracy of the full charge capacity as compared with the method described in Patent Document 1 while increasing the chances of correcting the full charge capacity.
- a full charge detection unit for detecting that the secondary battery is fully charged, and a full charge condition on the condition that the full charge of the secondary battery is detected by the full charge detection unit
- a full charge ratio estimation unit that estimates that the storage ratio of the secondary battery is 1 when the full charge condition is satisfied, and the correction control unit includes the first estimation unit and It is preferable that the open ratio estimation unit is set as one of the second estimation units and the full charge ratio estimation unit is set as the other estimation unit.
- the full charge detection unit detects that the secondary battery is fully charged. Then, when the full charge condition is satisfied, it means that the storage ratio of the secondary battery is almost certainly 1 (100%). Therefore, the full charge ratio estimation unit can estimate the storage ratio with extremely high accuracy by estimating that the storage ratio of the secondary battery is 1 (100%) when the full charge condition is satisfied. .
- the correction control unit sets the open ratio estimation unit as one of the first estimation unit and the second estimation unit, and sets the full charge ratio estimation unit as the other estimation unit, so that the estimation accuracy of the storage ratio is increased.
- the combination of an extremely high full charge ratio estimation unit and an open ratio estimation unit that has a higher estimation rate of the storage ratio than the full charge ratio estimation unit is used for correction of the full charge capacity, thereby improving correction accuracy and increasing correction opportunities. It is easy to achieve both in a balanced manner.
- a voltage conversion ratio acquisition unit that acquires the storage ratio of the secondary battery, and the storage ratio acquired by the voltage conversion ratio acquisition unit become a preset reference value.
- a reference condition as the estimable condition, and when the reference condition is satisfied, the storage ratio of the secondary battery is estimated to be the reference value, a reference ratio estimation unit, the correction control unit, It is preferable that the open ratio estimation unit is set as one of the first estimation unit and the second estimation unit, and the reference ratio estimation unit is set as the other estimation unit.
- the terminal voltage of the secondary battery changes according to the storage ratio.
- the voltage conversion ratio acquisition unit acquires the storage ratio based on the terminal voltage of the secondary battery. And when the storage ratio acquired by the voltage conversion ratio acquisition unit matches the reference value, that is, the storage ratio of the secondary battery is equal to the reference value, the reference ratio estimation unit, the reference value, By directly using the storage ratio of the secondary battery, the storage ratio of the secondary battery can be estimated. Then, by appropriately setting the reference value to a storage ratio different from full charge and complete discharge, the storage ratio of the secondary battery can be estimated without full charge or complete discharge. Opportunities increase.
- the correction control unit sets the open ratio estimation unit as one of the first estimation unit and the second estimation unit, and sets the reference ratio estimation unit as the other estimation unit, so that there are many opportunities for estimating the storage ratio.
- a full charge detection unit for detecting that the secondary battery is fully charged, and a full charge condition on the condition that the full charge of the secondary battery is detected by the full charge detection unit
- the secondary battery is used as a possible condition, based on a full charge ratio estimation unit that estimates that a storage ratio of the secondary battery is 1 when the full charge condition is satisfied, and a terminal voltage of the secondary battery.
- the voltage conversion ratio acquisition unit that acquires the storage ratio of the battery and the storage condition acquired by the voltage conversion ratio acquisition unit uses a reference condition that is a preset reference value as the estimable condition, and the reference condition is satisfied.
- a reference ratio estimation unit that estimates that the storage ratio of the secondary battery is the reference value
- the correction control unit includes the open-circuit voltage condition, the full charge condition, and the reference condition.
- the estimation unit that uses the satisfied condition as an estimable condition is the first estimation unit. Therefore, the chance of estimating the power storage ratio increases. Further, when the open ratio estimation unit is set as the first estimation unit by the correction control unit, any one of the open ratio estimation unit, the full charge ratio estimation unit, and the reference ratio estimation unit is used as the second estimation unit. When the estimation unit is set and one of the full charge ratio estimation unit and the reference ratio estimation unit is set as the first estimation unit, the open ratio estimation unit is set as the second estimation unit.
- At least one of the first and second estimators uses an open ratio estimator that has a higher power storage ratio estimation accuracy than the reference ratio estimator and has more storage ratio estimation opportunities than the full charge ratio estimator. As a result, it is easy to balance the improvement in correction accuracy and the increase in correction opportunities in a balanced manner.
- the correction control unit A new first power storage ratio is estimated by newly setting the estimation section set as the estimation section as the first estimation section and setting the estimated second power storage ratio as the first power storage ratio. For example, it is preferable to set a new second estimation unit.
- the second power storage ratio used for correcting the full charge capacity value is set as the first power storage ratio for the next correction by the correction control unit. Is done. Then, it is not necessary to re-estimate the first power storage ratio when the estimable condition is satisfied next time, and the second power storage ratio is estimated and charged again when the predetermined estimable condition is satisfied next time.
- the capacity value it is possible to continuously repeat the correction of the full charge capacity value. As a result, opportunities for correcting the full charge capacity value can be increased.
- the full charge capacity correction unit calculates the new full charge capacity value by multiplying the difference integrated value by a reciprocal of a subtraction value obtained by subtracting the second power storage ratio from the first power storage ratio. It is preferable.
- the full charge capacity correction unit can calculate a new full charge capacity value without using the full charge capacity value before correction, it is included in the full charge capacity value before correction.
- the full charge capacity value can be corrected without being affected by errors. Therefore, the correction accuracy of the full charge capacity value can be improved.
- the full charge capacity correction unit may calculate the new full charge capacity based on the following equation (1), where Ra is the first power storage ratio, Rb is the second power storage ratio, and Qd is the difference integrated value. It is preferable to calculate the value FCCN.
- the full charge capacity correction unit can calculate a new full charge capacity value using Expression (1) that does not include the full charge capacity value before correction.
- the full charge capacity value can be corrected without being affected by the error included in the value. Therefore, the correction accuracy of the full charge capacity value can be improved.
- the full charge capacity correction unit is configured to store the full charge capacity value before correction stored in the capacity storage unit as FCCO, the first power storage ratio Ra, the second power storage ratio Rb, and the difference integrated value.
- the first electric quantity QF that satisfies the following formula (2) is acquired
- the second electric quantity QS that satisfies the following formula (3) is acquired
- Ra ⁇ Rb and QF ⁇ QS The new full charge capacity value FCCN is calculated based on the following formula (4).
- Ra ⁇ Rb and QF> QS the new full charge capacity value FCCN is calculated based on the following formula (5).
- Ra> Rb and QF ⁇ QS the new full charge capacity value FCCN is calculated based on the following equation (5).
- Ra> Rb and QF> QS the following equation (4) is obtained. Based on the new full charge capacity value FCCN It may be.
- FCCO FCCO ⁇ Ra + Qd
- QS FCCO ⁇ Rb
- FCCN FCCO- ⁇
- FCCN FCCO + ⁇
- the full charge capacity correction unit when the first power storage ratio Ra is estimated by the first estimation unit, the integrated value by the integration unit is calculated between the full charge capacity value FCCO and the first power storage ratio Ra.
- the second power storage ratio Rb is estimated by the second estimation unit by updating to the multiplication value and causing the subsequent integration by the integration unit to be continuously performed on the updated multiplication value. It is preferable that the integrated value of the integrating unit is acquired as the first electric quantity QF.
- the full charge capacity correction unit updates the integrated value by the integration unit to a multiplication value of the full charge capacity value FCCO and the first power storage ratio Ra, and Subsequent integration by the integration unit is continued for the updated multiplication value.
- the integrated value by the integrating unit becomes the first electric quantity QF that satisfies the formula (2) as it is. Therefore, as a result of obtaining the first electric quantity QF without performing the calculation process of Expression (2), the calculation process can be simplified.
- the power storage ratio includes a first range in which a terminal voltage of the secondary battery changes with respect to a change in the power storage ratio, and a change in terminal voltage of the secondary battery with respect to a change in the power storage ratio. It is preferable that there is a second range smaller than the range, and a value selected from among the power storage ratios belonging to the first range is set as the reference value.
- the value selected from the power storage ratios belonging to the first range in which the change in the terminal voltage with respect to the power storage ratio change is larger than the second range is set as the reference value used by the reference ratio estimation unit. The Then, in the region where the terminal voltage changes greatly with respect to the change in the storage ratio, the storage ratio acquired based on the terminal voltage matches the reference value, so that the determination accuracy of the reference condition is improved.
- the reference ratio estimation unit estimates that the storage ratio of the secondary battery is the reference value when the reference condition is satisfied. Therefore, if the determination accuracy of the reference condition is improved, the storage by the reference ratio estimation unit is performed. The accuracy of estimating the ratio is improved, and the accuracy of correcting the full charge capacity value is improved.
- the secondary battery is a lithium ion secondary battery, and the reference value is set to a value of 10% or less.
- the region where the SOC is 10% or less in the lithium ion secondary battery corresponds to the first range. Therefore, if the reference value is set to a value of 10% or less, it is possible to improve the correction accuracy of the full charge capacity value.
- a current detection unit that detects a current value of a current flowing through the secondary battery; a voltage detection unit that detects a terminal voltage of the secondary battery; a temperature detection unit that detects a temperature of the secondary battery; A table storage unit that stores a lookup table that associates the storage ratio of the secondary battery, the current value flowing through the secondary battery, and the temperature of the secondary battery with the terminal voltage of the secondary battery, and the voltage conversion
- the ratio acquisition unit includes a terminal voltage detected by the voltage detection unit, a current value detected by the current detection unit, and a temperature detected by the temperature detection unit using a lookup table stored in the table storage unit. It is preferable to acquire the power storage ratio associated with.
- the voltage conversion ratio acquisition unit Using the terminal voltage detected by the voltage detection unit, the current value detected by the current detection unit, and the temperature detected by the temperature detection unit, while reducing the influence of the current value and temperature flowing in the secondary battery The storage ratio of the secondary battery can be easily obtained.
- a charging system includes the above-described full charge capacity correction circuit, and a charging unit that charges the secondary battery by applying a full charge voltage of the secondary battery to the full battery.
- the detection unit determines that the secondary battery is fully charged when a current flowing through the secondary battery during charging by the charging unit falls below a preset determination threshold.
- the full charge detection unit can detect with high accuracy that the secondary battery is fully charged.
- the battery pack according to one aspect of the present invention includes the above-described full charge capacity correction circuit and the secondary battery.
- the full charge capacity correction accuracy can be improved as compared with the method described in Patent Document 1 while increasing the full charge capacity correction opportunities.
- the full charge capacity correction method includes an integration step of calculating an integrated value by integrating current values of currents flowing through the secondary battery, and an actual full charge capacity of the secondary battery.
- an estimable condition which is a condition for estimating a power storage ratio that is a ratio of the amount of stored electricity stored in the secondary battery, is satisfied, the power storage ratio of the secondary battery is estimated as a first power storage ratio.
- the first estimation step After estimating the first power storage ratio in the first estimation step and the first estimation step, it is monitored whether an estimable condition that is a condition for estimating the power storage ratio is satisfied, and the estimable condition Is satisfied, a second estimation step of estimating the storage ratio of the secondary battery at this time as a second storage ratio, and the first storage ratio is estimated in the first estimation step, and then the second In the estimation process 2 based on a difference integrated value that is an integrated value accumulated by the integrating step until a power storage ratio is estimated, and a ratio between the first power storage ratio and the difference between the second power storage ratio and 1.
- the estimable condition is an open-circuit voltage condition on condition that the flowing current is below a predetermined open-circuit determination value for determining that an open-circuit voltage is obtained as the terminal voltage of the secondary battery.
- the full charge capacity correction circuit, the charging system, the battery pack, and the full charge capacity correction method having the above configuration increase the full charge capacity correction opportunities and calculate the full charge capacity more than the method described in Patent Document 1. Accuracy can be improved.
- a full charge capacity correction circuit, a charging system, a battery pack, and a full charge capacity correction method according to the present invention include a portable personal computer, a digital camera, a video camera, an electronic device such as a mobile phone, a vehicle such as an electric vehicle and a hybrid car.
- a hybrid elevator a solar battery, a power supply system in which a power generation device and a secondary battery are combined, a battery mounting device such as a non-stop power supply device, and a system can be suitably used.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
FCCN=3000×1/(1-0.2)=3750mAhとなる。
QF=4000×0.2+3000=3800mAh
QS=4000×1=4000mAh
Ra<RbかつQF<QSなので、式(4)を用いて、
FCCN=4000-{|4000-3800|×(1/|1-0.2|)}=3750mAh
となる。
FCCN=3400×1/(1-0.2)=4250mAhとなる。
QF=4000×0.2+3400=4200mAh
QS=4000×1=4000mAh
Ra<RbかつQF>QSなので、式(5)を用いて
FCCN=4000+{|4000-4200|×(1/|1-0.2|)}=4250mAh
となる。
FCCN=-2000×1/(0.055-0.6)=3670mAhとなる。
QF=4000×0.6-2000=400mAh
QS=4000×0.055=220mAh
Ra>RbかつQF>QSなので、式(4)が用いられ、
FCCN=4000-{|220-400|×(1/|0.055-0.6|)}=3670mAh
となる。図11においては、タイミングT5において、JUMP処理が実行される。
FCCN=-2360×1/(0.055-0.6)=4330mAhとなる。
QF=4000×0.6-2360=40mAh
QS=4000×0.055=220mAh
Ra>RbかつQF<QSなので、式(5)が用いられ、
FCCN=4000+{|220-40|×(1/|0.055-0.6|)}=4330mAh
となる。図12においては、タイミングT6~T5において、KEEP処理が実行される。
FCCN=-1800×1/(0.1-0.6)=3600mAhとなる。
QF=4000×0.6-1800=600mAh
QS=4000×0.1=400mAh
Ra>RbかつQF>QSなので、式(4)が用いられ、
FCCN=4000-{|400-600|×(1/|0.1-0.6|)}=3600mAh
となる。図13においては、タイミングT8において、JUMP処理が実行される。
FCCN=-2200×1/(0.1-0.6)=4400mAhとなる。
QF=4000×0.6-2200=200mAh
QS=4000×0.1=400mAh
Ra>RbかつQF<QSなので、式(5)が用いられ、
FCCN=4000+{|400-200|×(1/|0.1-0.6|)}=4400mAh
となる。図14においては、タイミングT8において、JUMP処理が実行される。
QS=FCCO×Rb ・・・(3)
FCCN=FCCO-{|QS-QF|×(1/|Rb-Ra|)}・・・ (4)
FCCN=FCCO+{|QS-QF|×(1/|Rb-Ra|)}・・・ (5)。
Claims (15)
- 二次電池に流れる電流の電流値を積算することで、積算値を算出する積算部と、
前記二次電池の満充電容量を示す満充電容量値を記憶する容量記憶部と、
前記二次電池の実際の満充電容量に対するこの二次電池に蓄えられている蓄電電気量の比率である蓄電比率を推定可能な条件である推定可能条件が、満たされたとき、前記二次電池の蓄電比率を第1蓄電比率として推定する第1推定部と、
前記第1推定部によって前記第1蓄電比率が推定された後、前記蓄電比率を推定可能な条件である推定可能条件が満たされるか否かを監視し、当該推定可能条件が満たされたとき、このときの前記二次電池の蓄電比率を第2蓄電比率として推定する第2推定部と、
前記第1推定部によって前記第1蓄電比率が推定されてから、前記第2推定部によって前記第2蓄電比率が推定されるまでの間において前記積算部により積算された積算値である差分積算値と、前記第1蓄電比率及び前記第2蓄電比率の差と1との比率と、に基づいて前記二次電池の満充電容量値を推定し、当該推定された満充電容量値を新たな満充電容量値として前記容量記憶部に記憶させることにより満充電容量値を補正する満充電容量補正部と、
前記二次電池に流れる電流が、当該二次電池の端子電圧として開放電圧が得られる状態であることを判定するために予め設定された開放判定値を、下回ることを条件とする開放電圧条件を前記推定可能条件として用い、当該開放電圧条件が満たされたとき、前記二次電池の端子電圧に基づき前記二次電池の蓄電比率を推定する開放比率推定部と、
前記第1推定部及び前記第2推定部のうち少なくとも一つとして、前記開放比率推定部を設定する補正制御部と
を備えることを特徴とする満充電容量補正回路。 - 前記二次電池が満充電になったことを検出する満充電検出部と、
前記満充電検出部によって前記二次電池の満充電が検出されることを条件とする満充電条件を前記推定可能条件として用い、当該満充電条件が満たされたとき、前記二次電池の蓄電比率は1であると推定する満充電比率推定部とを備え、
前記補正制御部は、
前記第1推定部及び前記第2推定部のうち一方として前記開放比率推定部を設定し、他方の推定部として前記満充電比率推定部を設定すること
を特徴とする請求項1記載の満充電容量補正回路。 - 前記二次電池の端子電圧に基づき、前記二次電池の蓄電比率を取得する電圧換算比率取得部と、
前記電圧換算比率取得部によって取得された蓄電比率が予め設定された基準値になる基準条件を前記推定可能条件として用い、当該基準条件が満たされたとき、前記二次電池の蓄電比率は前記基準値であると推定する基準比率推定部とを備え、
前記補正制御部は、
前記第1推定部及び前記第2推定部のうち一方として前記開放比率推定部を設定し、他方の推定部として前記基準比率推定部を設定すること
を特徴とする請求項1記載の満充電容量補正回路。 - 前記二次電池が満充電になったことを検出する満充電検出部と、
前記満充電検出部によって前記二次電池の満充電が検出されることを条件とする満充電条件を前記推定可能条件として用い、当該満充電条件が満たされたとき、前記二次電池の蓄電比率は1であると推定する満充電比率推定部と、
前記二次電池の端子電圧に基づき、前記二次電池の蓄電比率を取得する電圧換算比率取得部と、
前記電圧換算比率取得部によって取得された蓄電比率が、予め設定された基準値になる基準条件を前記推定可能条件として用い、当該基準条件が満たされたとき、前記二次電池の蓄電比率は前記基準値であると推定する基準比率推定部とを備え、
前記補正制御部は、
前記開放電圧条件、前記満充電条件、及び前記基準条件のうちいずれかが満たされたとき、当該満たされた条件を前記推定可能条件として用いる推定部を前記第1推定部として設定し、当該第1推定部として前記開放比率推定部を設定したときは、前記第2推定部として、当該開放比率推定部、前記満充電比率推定部、及び前記基準比率推定部のうちいずれかの推定部を設定し、当該第1推定部として前記満充電比率推定部及び前記基準比率推定部のうちいずれかの推定部を設定したときは、前記第2推定部として前記開放比率推定部を設定すること
を特徴とする請求項1記載の満充電容量補正回路。 - 前記補正制御部は、
前記第2推定部によって前記第2蓄電比率が推定され、前記満充電容量補正部によって新たな満充電容量値が前記容量記憶部に記憶されたとき、当該第2推定部として設定されていた推定部を新たに前記第1推定部として設定し、当該推定されていた第2蓄電比率を前記第1蓄電比率として設定することにより新たな第1蓄電比率が推定されたものとして、新たな前記第2推定部の設定を行うこと
を特徴とする請求項1~4のいずれか1項に記載の満充電容量補正回路。 - 前記満充電容量補正部は、
前記第1蓄電比率から前記第2蓄電比率を減算した減算値の逆数を、前記差分積算値に乗算することにより、前記新たな満充電容量値を算出すること
を特徴とする請求項1~5のいずれか1項に記載の満充電容量補正回路。 - 前記満充電容量補正部は、
前記第1蓄電比率をRa、前記第2蓄電比率をRb、前記差分積算値をQdとすると、下記の式(1)に基づき、前記新たな満充電容量値FCCNを算出すること
満充電容量値FCCN=Qd×1/(Rb-Ra) ・・・(1)
を特徴とする請求項6記載の満充電容量補正回路。 - 前記満充電容量補正部は、
前記容量記憶部に記憶されている補正前の満充電容量値をFCCO、前記第1蓄電比率をRa、前記第2蓄電比率をRb、前記差分積算値をQdとすると、下記の式(2)を満たす第1電気量QFを取得し、下記の式(3)を満たす第2電気量QSを取得すると共に、Ra<RbかつQF<QSとなるとき、下記の式(4)に基づき前記新たな満充電容量値FCCNを算出し、Ra<RbかつQF>QSとなるとき、下記の式(5)に基づき前記新たな満充電容量値FCCNを算出し、Ra>RbかつQF<QSとなるとき、下記の式(5)に基づき前記新たな満充電容量値FCCNを算出し、Ra>RbかつQF>QSとなるとき、下記の式(4)に基づき前記新たな満充電容量値FCCNを算出すること
QF=FCCO×Ra+Qd ・・・(2)
QS=FCCO×Rb ・・・(3)
FCCN=FCCO-{|QS-QF|×(1/|Rb-Ra|)}・・・ (4)
FCCN=FCCO+{|QS-QF|×(1/|Rb-Ra|)}・・・ (5)
を特徴とする請求項1~5のいずれか1項に記載の満充電容量補正回路。 - 前記満充電容量補正部は、
前記第1推定部によって前記第1蓄電比率Raが推定されたとき、前記積算部による積算値を前記満充電容量値FCCOと前記第1蓄電比率Raとの乗算値に更新し、当該積算部による以後の積算を、当該更新された後の乗算値に対して引き続き行わせることにより、前記第2推定部によって前記第2蓄電比率Rbが推定されたときにおける前記積算部の積算値を、前記第1電気量QFとして取得すること
を特徴とする請求項8記載の満充電容量補正回路。 - 前記蓄電比率には、前記蓄電比率の変化に対して前記二次電池の端子電圧が変化する第1範囲と、前記蓄電比率の変化に対する前記二次電池の端子電圧の変化が前記第1範囲より小さい第2範囲とが存在し、
前記基準値として、前記第1範囲に属する蓄電比率のうちから選択された値が設定されていること
を特徴とする請求項3又は4記載の満充電容量補正回路。 - 前記二次電池は、リチウムイオン二次電池であり、
前記基準値は、10%以下の値に設定されていること
を特徴とする請求項10記載の満充電容量補正回路。 - 前記二次電池に流れる電流の電流値を検出する電流検出部と、
前記二次電池の端子電圧を検出する電圧検出部と、
前記二次電池の温度を検出する温度検出部と、
前記二次電池の蓄電比率と前記二次電池を流れる電流値と前記二次電池の温度とを、当該二次電池の端子電圧と対応付けるルックアップテーブルを記憶するテーブル記憶部とを備え、
前記電圧換算比率取得部は、
前記テーブル記憶部に記憶されるルックアップテーブルによって、前記電圧検出部によって検出された端子電圧、前記電流検出部によって検出された電流値、及び前記温度検出部によって検出された温度と対応付けられている蓄電比率を取得すること
を特徴とする請求項3又は4記載の満充電容量補正回路。 - 請求項2又は4に記載の満充電容量補正回路と、
前記二次電池の満充電電圧を当該二次電池に印加することにより充電する充電部とを備え、
前記満充電検出部は、
前記充電部による充電中に当該二次電池に流れる電流が予め設定された判定閾値を下回るとき、当該二次電池が満充電になったと判定すること
を特徴とする充電システム。 - 請求項1~12のいずれか1項に記載の満充電容量補正回路と、
前記二次電池と
を備えることを特徴とする電池パック。 - 二次電池に流れる電流の電流値を積算することで、積算値を算出する積算工程と、
前記二次電池の実際の満充電容量に対するこの二次電池に蓄えられている蓄電電気量の比率である蓄電比率を推定可能な条件である推定可能条件が、満たされたとき、前記二次電池の蓄電比率を第1蓄電比率として推定する第1推定工程と、
前記第1推定工程において前記第1蓄電比率が推定された後、前記蓄電比率を推定可能な条件である推定可能条件が満たされるか否かを監視し、当該推定可能条件が満たされたとき、このときの前記二次電池の蓄電比率を第2蓄電比率として推定する第2推定工程と、
前記第1推定工程において前記第1蓄電比率が推定されてから、前記第2推定工程において前記第2蓄電比率が推定されるまでの間において前記積算工程により積算された積算値である差分積算値と、前記第1蓄電比率及び前記第2蓄電比率の差と1との比率と、に基づいて、前記二次電池の満充電容量値を推定し、当該推定された満充電容量値を新たな満充電容量値として当該満充電容量値を補正する満充電容量補正工程と、
前記二次電池に流れる電流が、当該二次電池の端子電圧として開放電圧が得られる状態であることを判定するために予め設定された開放判定値を、下回ることを条件とする開放電圧条件を前記推定可能条件として用い、当該開放電圧条件が満たされたとき、前記二次電池の端子電圧に基づき前記二次電池の蓄電比率を推定する開放比率推定工程と、
前記第1推定工程及び前記第2推定工程のうち少なくとも一つとして、前記開放比率推定工程を用いる
ことを特徴とする満充電容量補正方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012506259A JP4997358B2 (ja) | 2010-04-30 | 2010-04-30 | 満充電容量補正回路、充電システム、電池パック、及び満充電容量補正方法 |
CN201080062474.9A CN102741699B (zh) | 2010-04-30 | 2010-04-30 | 满充电容量修正电路、充电系统、电池组件以及满充电容量修正方法 |
PCT/JP2010/003088 WO2011135631A1 (ja) | 2010-04-30 | 2010-04-30 | 満充電容量補正回路、充電システム、電池パック、及び満充電容量補正方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2010/003088 WO2011135631A1 (ja) | 2010-04-30 | 2010-04-30 | 満充電容量補正回路、充電システム、電池パック、及び満充電容量補正方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011135631A1 true WO2011135631A1 (ja) | 2011-11-03 |
Family
ID=44860980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/003088 WO2011135631A1 (ja) | 2010-04-30 | 2010-04-30 | 満充電容量補正回路、充電システム、電池パック、及び満充電容量補正方法 |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP4997358B2 (ja) |
CN (1) | CN102741699B (ja) |
WO (1) | WO2011135631A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013084673A1 (ja) * | 2011-12-09 | 2013-06-13 | 三菱重工業株式会社 | 充放電制御装置、充電制御方法、放電制御方法、及びプログラム |
JP2018048911A (ja) * | 2016-09-21 | 2018-03-29 | 株式会社豊田自動織機 | 満充電容量推定装置 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6097599B2 (ja) * | 2013-03-07 | 2017-03-15 | 古河電気工業株式会社 | 二次電池の状態検知方法及び状態検知装置 |
CN104931882B (zh) * | 2014-03-21 | 2018-04-20 | 比亚迪股份有限公司 | 动力电池容量修正的方法和装置 |
JP5959566B2 (ja) * | 2014-04-10 | 2016-08-02 | 三菱電機株式会社 | 蓄電池の制御装置 |
CN105990616B (zh) * | 2015-02-13 | 2019-08-27 | 联想(北京)有限公司 | 一种数据处理方法、装置及电子设备 |
JP6698169B2 (ja) * | 2016-10-17 | 2020-05-27 | 株式会社日立製作所 | 蓄電池システム |
KR102244140B1 (ko) * | 2017-12-21 | 2021-04-22 | 주식회사 엘지화학 | 배터리의 충전 상태를 캘리브레이션하기 위한 방법 및 배터리 관리 시스템 |
CN110068765B (zh) * | 2018-01-19 | 2021-06-15 | 新盛力科技股份有限公司 | 电池容量的预估方法 |
CN111416398B (zh) * | 2019-01-08 | 2023-11-14 | 太普动力新能源(常熟)股份有限公司 | 可充电电池的相对荷电状态的修正方法 |
WO2023000254A1 (zh) * | 2021-07-22 | 2023-01-26 | 宁德时代新能源科技股份有限公司 | 确定电池包的满充容量和健康状况的方法、系统及装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04115084U (ja) * | 1991-03-26 | 1992-10-12 | 九州電機製造株式会社 | 電気自動車用電池残存容量計 |
JP2001057246A (ja) * | 1999-08-18 | 2001-02-27 | Sony Corp | バッテリー機器及びバッテリーの管理方法 |
JP2004257781A (ja) * | 2003-02-25 | 2004-09-16 | Shin Kobe Electric Mach Co Ltd | 劣化度推定方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3674466B2 (ja) * | 1999-11-24 | 2005-07-20 | セイコーエプソン株式会社 | 電圧検出装置、電池残量検出装置、電圧検出方法、電池残量検出方法、電子時計および電子機器 |
JP4097183B2 (ja) * | 2001-12-27 | 2008-06-11 | パナソニックEvエナジー株式会社 | 二次電池の残存容量推定方法および装置、並びに電池パックシステム |
JP4283615B2 (ja) * | 2003-08-14 | 2009-06-24 | パナソニックEvエナジー株式会社 | 二次電池の電圧補正方法および装置、並びに二次電池の残存容量推定方法および装置 |
CN101169471B (zh) * | 2006-10-23 | 2010-09-15 | 王顺兴 | 二次电池容量估算法 |
JP4805101B2 (ja) * | 2006-11-21 | 2011-11-02 | 古河電気工業株式会社 | バッテリ状態推定方法、バッテリ状態監視装置及びバッテリ電源システム |
CN101359036B (zh) * | 2007-07-31 | 2010-11-17 | 比亚迪股份有限公司 | 电池荷电状态的测定方法 |
KR100985667B1 (ko) * | 2007-08-22 | 2010-10-05 | 주식회사 엘지화학 | 배터리 개방전압 추정장치, 이를 이용한 배터리 충전상태추정장치 및 그 제어 방법 |
-
2010
- 2010-04-30 JP JP2012506259A patent/JP4997358B2/ja active Active
- 2010-04-30 CN CN201080062474.9A patent/CN102741699B/zh active Active
- 2010-04-30 WO PCT/JP2010/003088 patent/WO2011135631A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04115084U (ja) * | 1991-03-26 | 1992-10-12 | 九州電機製造株式会社 | 電気自動車用電池残存容量計 |
JP2001057246A (ja) * | 1999-08-18 | 2001-02-27 | Sony Corp | バッテリー機器及びバッテリーの管理方法 |
JP2004257781A (ja) * | 2003-02-25 | 2004-09-16 | Shin Kobe Electric Mach Co Ltd | 劣化度推定方法 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013084673A1 (ja) * | 2011-12-09 | 2013-06-13 | 三菱重工業株式会社 | 充放電制御装置、充電制御方法、放電制御方法、及びプログラム |
JP2013123280A (ja) * | 2011-12-09 | 2013-06-20 | Mitsubishi Heavy Ind Ltd | 充放電制御装置、充電制御方法、放電制御方法、及びプログラム |
CN103947073A (zh) * | 2011-12-09 | 2014-07-23 | 三菱重工业株式会社 | 充放电控制装置、充电控制方法、放电控制方法以及程序 |
US9419461B2 (en) | 2011-12-09 | 2016-08-16 | Mitsubishi Heavy Industruies, Ltd. | Charge and discharge control device, charge control method, discharge control method, and program |
CN103947073B (zh) * | 2011-12-09 | 2016-10-12 | 三菱重工业株式会社 | 充放电控制装置、充电控制方法以及放电控制方法 |
JP2018048911A (ja) * | 2016-09-21 | 2018-03-29 | 株式会社豊田自動織機 | 満充電容量推定装置 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2011135631A1 (ja) | 2013-07-18 |
CN102741699B (zh) | 2014-12-03 |
CN102741699A (zh) | 2012-10-17 |
JP4997358B2 (ja) | 2012-08-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4997358B2 (ja) | 満充電容量補正回路、充電システム、電池パック、及び満充電容量補正方法 | |
JP4852672B2 (ja) | 満充電容量値補正回路、電池パック、及び充電システム | |
US8736232B2 (en) | Full charge capacity correction circuit, charging system, battery pack and full charge capacity correction method | |
US7459884B2 (en) | Remaining capacity calculation method for secondary battery, and battery pack | |
US8965722B2 (en) | Apparatus for calculating residual capacity of secondary battery | |
JP5393837B2 (ja) | バッテリの充電率推定装置 | |
US8269463B2 (en) | Battery abnormality detection circuit and power supply device | |
US20120121952A1 (en) | Battery status detecting device and battery pack where the battery status detecting device is provided | |
WO2011004550A1 (ja) | サイクル数計数回路、電池パック、及び電池システム | |
US9506988B2 (en) | Condition estimation device and method of estimating condition | |
US20060076929A1 (en) | Method of detecting state-of-charge of battery and power device | |
US20100017155A1 (en) | Battery management system | |
KR20150029204A (ko) | 배터리 팩, 배터리 팩을 포함하는 장치, 및 배터리 팩의 관리 방법 | |
CN101192757A (zh) | 充电系统、充电装置以及电池组件 | |
US20160216336A1 (en) | Secondary battery charge status estimation device and secondary battery charge status estimation method | |
JP2015155859A (ja) | 電池残量推定装置、電池パック、蓄電装置、電動車両および電池残量推定方法 | |
JP2010200574A (ja) | 自己診断回路、及び電源装置 | |
WO2010140233A1 (ja) | 電池充電率算出装置 | |
JP2017009577A (ja) | 状態推定装置及び状態推定方法 | |
US20130085695A1 (en) | Battery state measuring method and apparatus, and electronic apparatus | |
JP2011069782A (ja) | 電圧監視回路、及び電池電源装置 | |
JP2018048916A (ja) | リチャージャブルバッテリの残量検出回路、それを用いた電子機器、自動車ならびに充電状態の検出方法 | |
JP2011151983A (ja) | Soc検出回路、及び電池電源装置 | |
CN111557067A (zh) | 蓄电装置、蓄电系统、电源系统及蓄电装置的控制方法 | |
JP5911407B2 (ja) | バッテリの健全度算出装置および健全度算出方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201080062474.9 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 10850651 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012506259 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 10850651 Country of ref document: EP Kind code of ref document: A1 |