JP5833018B2 - Secondary battery remaining capacity correction method, secondary battery remaining capacity correction apparatus, and secondary battery apparatus - Google Patents

Description

  The present invention relates to a secondary battery remaining capacity correcting method, a secondary battery remaining capacity correcting apparatus, a secondary battery remaining capacity correcting apparatus, and a secondary battery remaining capacity correcting apparatus. The present invention relates to a secondary battery device.

  Conventionally, the remaining capacity of a secondary battery mounted on an electronic device such as a personal computer is, for example, charged to the amount of electricity (current value × time) or the amount of power (power value × time) when fully charged. It is calculated by adding an integrated value of discharge current or charge / discharge power (hereinafter referred to as charge / discharge capacity). The calculated remaining capacity can be expressed as a percentage (%) with respect to the remaining capacity at full charge.

  In order to prevent the difference between the accumulated remaining capacity and the actual remaining capacity from expanding, the voltage of the secondary battery corresponds to a predetermined remaining capacity (for example, the remaining capacity is N%). There is known a method for correcting the accumulated remaining capacity to N% when N is lower than N (generally a natural number of about 10). In this case, the capacity obtained by dividing the accumulated discharge capacity-charge capacity from the time of full charge by (1-N / 100) is used as the total capacity (learning capacity) of the secondary battery. Yes.

  For example, in Patent Document 1, when correcting the remaining capacity when the time when the voltage of the secondary battery falls below the known determination voltage corresponding to the remaining capacity of N% is equal to or longer than the determination time, the discharge current being determined A technique is disclosed that uses the longest determination time among the determination times that should be changed to short / long according to the determination voltage while changing the determination voltage to high / low according to the large / small. By this technique, the remaining capacity of the secondary battery is corrected more accurately.

JP 2010-164322 A

  However, in recent years, secondary batteries are sometimes used in electric vehicles such as electric motorcycles and electric bicycles. In the case where electric batteries that perform power regeneration are intermittently charged with secondary batteries, Patent Document 1 discloses that The disclosed technology has a problem that the remaining capacity cannot be corrected properly because the time measurement result of the duration of the state in which the voltage of the secondary battery is lower than the determination voltage is initialized each time charging occurs. .

  The present invention has been made in view of such circumstances, and the object of the present invention is to charge even if charging occurs during the determination for correcting the remaining capacity of the secondary battery. An object of the present invention is to provide a secondary battery remaining capacity correcting method, a secondary battery remaining capacity correcting apparatus, and a secondary battery apparatus capable of appropriately correcting the remaining capacity by continuing determination before and after.

  The method for correcting the remaining capacity of the secondary battery according to the present invention includes detecting the voltage and charge / discharge current of the secondary battery in time series and integrating the remaining capacity, and determining the detected voltage to be lower than a predetermined voltage. In the secondary battery remaining capacity correction method in which the remaining capacity is corrected to the predetermined capacity when the counted number is greater than the predetermined number, the detected charge is determined when it is determined that the detected voltage is not lower than the predetermined voltage. Whether or not the secondary battery is charged is determined based on a discharge current. When it is determined that the secondary battery is charged, the counting of the number of times is interrupted.

  The method for correcting the remaining capacity of the secondary battery according to the present invention integrates the charging / discharging current after determining that the detected voltage is lower than the predetermined voltage, and interrupts the counting of the number of times, the integrated value of the charging / discharging current. Is determined to be larger than a predetermined value, and when it is determined to be larger than the predetermined value, the count value of the number of times is initialized.

  The secondary battery remaining capacity correction apparatus according to the present invention detects the voltage and charging / discharging current of the secondary battery in time series, integrates the remaining capacity, and determines the detected voltage is lower than a predetermined voltage. In the secondary battery remaining capacity correction device that corrects the remaining capacity to a predetermined capacity when the number of times counted is greater than the predetermined number, the detected charge is determined when it is determined that the detected voltage is not lower than the predetermined voltage. Means for determining whether or not the secondary battery is charged based on a discharge current, and counting the number of times when it is determined that the means is charged. .

The secondary battery remaining capacity correction device according to the present invention, the integration means for integrating the charge and discharge current after determining that the detected voltage is lower than the predetermined voltage,
A determination unit that determines whether or not the integrated value of the integration unit is greater than a predetermined value when the counting of the number of times is interrupted, and the integration unit determines that the determination unit is greater than a predetermined value; The count value of the number of times is initialized.

  A secondary battery device according to the present invention includes the above-described remaining capacity correcting device for a secondary battery and one or more secondary batteries whose remaining capacity is corrected by the remaining capacity correcting device.

In the present invention, the voltage of the secondary battery detected in time series is not lower than the predetermined voltage, and the secondary battery is determined to be charging based on the charge / discharge current detected in time series In addition, the counting of the number of times that the voltage of the secondary battery is determined to be lower than the predetermined voltage is interrupted.
As a result, when the secondary battery is charged and the voltage becomes higher than the predetermined voltage, the count result of the number of times that the voltage of the secondary battery is determined to be lower than the predetermined voltage is held without being initialized. . Then, when the charging is completed and the voltage of the secondary battery becomes lower than the predetermined voltage, the counting of the number of times is resumed, and the counting result held until then is taken over by the counting of the number of times of resumption.

In the present invention, when charging has occurred and the counting of the number of times that the voltage of the secondary battery is determined to be lower than the predetermined voltage is interrupted, the integrated value of the charging / discharging current after starting the counting of the number of times Is greater than a predetermined value, the count result of the number of times is initialized. The predetermined value in this case is compared with an integrated value that increases or decreases according to charge / discharge of the secondary battery, and can take a negative value.
As a result, when the remaining capacity of the secondary battery approaches the remaining capacity when the counting is started due to the secondary battery being charged, the determination for correcting the remaining capacity is performed again from the beginning. be able to.

In the present invention, the above-mentioned secondary battery remaining capacity correction device integrates the remaining capacity of the secondary battery and corrects the accumulated remaining capacity.
As a result, even when charging occurs while the determination for correcting the remaining capacity of the secondary battery is continued, the determination can be continued before and after the charging to appropriately correct the remaining capacity. A secondary battery remaining capacity correction device is applied to a secondary battery device.

According to the present invention, when the secondary battery is charged and the voltage becomes higher than the predetermined voltage, the counting result of the number of times that the voltage of the secondary battery is determined to be lower than the predetermined voltage is not initialized. Deferred. Then, when charging is finished and the counting of the number of times is resumed, the count result that has been suspended is taken over by a new number of times of counting.
Therefore, even when charging occurs during the determination for correcting the remaining capacity of the secondary battery, it is possible to continue the determination before and after charging and correct the remaining capacity appropriately.

It is a block diagram which shows the structural example of the secondary battery apparatus which concerns on Embodiment 1 of this invention. It is a graph which shows typically a time change of battery voltage at the time of regenerative charge generating during discharge of a secondary battery. 4 is a flowchart illustrating a processing procedure of a CPU of the remaining capacity correction device according to the first embodiment. It is a flowchart which shows the process sequence of CPU which calculates a charging current and a discharge current. It is a graph which shows typically a time change of battery voltage when regenerative charge with a long duration occurs during discharge of a secondary battery. 6 is a flowchart illustrating a processing procedure of a CPU of a remaining capacity correction device according to a second embodiment.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
(Embodiment 1)
FIG. 1 is a block diagram showing a configuration example of a secondary battery device according to Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes a secondary battery device (pack battery). The secondary battery device 1 includes a secondary battery 2 formed by connecting one or a plurality of lithium ion batteries in series, parallel, or series-parallel, and the secondary battery device 1. And a remaining capacity correction device 3 connected to the positive terminal and the negative terminal of the battery 2. The secondary battery 2 may be another secondary battery such as a nickel metal hydride battery.

  The remaining capacity correction device 3 is connected to the positive electrode terminal and the negative electrode terminal of the secondary battery 2 to detect the voltage of the secondary battery 2, and one end is connected to the negative electrode terminal of the secondary battery 2. A current detection unit 5 that detects charging / discharging current of the secondary battery 2 and a control unit 6 that calculates a remaining capacity based on detection values given from these detection units are provided. The control unit 6 includes a temperature detection unit 7 that detects the temperature of the secondary battery 2 using a temperature sensor 71 that is thermally coupled to the secondary battery 2, and communicates the calculated remaining capacity data to an external electrical device. A communication unit 8 for transmitting via a terminal 81 is connected. Each of the positive electrode terminal of the secondary battery 2 and the other terminal of the current detection unit 5 is connected to an external electric device via a + (plus) terminal 21 and a − (minus) terminal 22.

  The control unit 6 includes a CPU 61, and the CPU 61 is bus-connected to a ROM 62 that stores information such as programs, a RAM 63 that stores temporarily generated information, a communication unit 8, and an A / D converter (not shown). ing. Detection output terminals of the voltage detection unit 4, the current detection unit 5, and the temperature detection unit 7 are connected to a plurality of analog input terminals of the A / D converter. The ROM 62 is a nonvolatile memory composed of an EEPROM (Electrically Erasable Programmable ROM) or a flash memory. In addition to the program, the ROM 62 has a learning capacity of the secondary battery 2, a remaining capacity, the number of charge / discharge cycles, and an abnormal time. Stored data such as detection values and various setting data for correcting the remaining capacity are stored.

  The current detection unit 5 is composed of a resistance element having a low resistance value, and supplies a voltage drop when the charge / discharge current of the secondary battery 2 flows through the resistance element to the A / D converter as an analog detection signal. In this case, the polarity of the analog detection signal becomes positive and negative according to charging and discharging of the secondary battery 2, respectively. A semiconductor such as a transistor or FET can be used instead of the resistance element. Without using a resistance element, the negative electrode terminal of the secondary battery 2 and the negative terminal 22 are directly connected by a lead wire, and by detecting a magnetic field generated from the lead wire, the charge / discharge current flowing through the lead wire is reduced. You may make it detect.

The voltage detector 4 detects the voltage of the secondary battery 2 and provides an analog detection signal to the A / D converter.
The A / D converter given analog detection signals from the voltage detection unit 4, the current detection unit 5 and the temperature detection unit 7 converts each analog detection signal into a digital detection value. The converted digital detection value is taken into the CPU 61 as appropriate.

  The CPU 61 executes processes such as input / output and calculation according to a control program stored in advance in the ROM 62. In the first embodiment, the CPU 61 takes in digital detection values related to the voltage and charge / discharge current of the secondary battery 2 from the A / D converter at a cycle of 10 ms, and sets the average value of the taken detection values as the battery. The voltage, charging current, and discharging current are calculated at a cycle of 250 ms. The CPU 61 also calculates the discharge capacity by integrating the calculated discharge current in a cycle of 250 ms, and calculates the remaining capacity by subtracting the calculated discharge capacity from the full charge capacity (learning capacity). Therefore, the remaining capacity decreases as time elapses when the secondary battery 2 is discharged from the fully charged state.

  The CPU 61 further indicates that the state where the calculated battery voltage is lower than the battery voltage indicating that the remaining capacity is N% (hereinafter referred to as N% voltage) is a time indicated by Tn (hereinafter referred to as N% determination time). If it continues for a longer time, the remaining capacity is corrected to N%. For example, when the secondary battery 2 is a lithium ion battery, the battery voltage indicating that the remaining capacity is 10% is 3.1 V / cell. When counting the number of continuations of the determination in the 250 ms fixed period processing instead of counting time, the continuation is continued by Cn (hereinafter also referred to as N% determination number) indicating the number of times four times the value of Tn in seconds. Count the number of times. The voltage value of N% voltage, the value of N, and the values of Tn and Cn are stored in the ROM 62. These values may be appropriately changed according to the temperature of the secondary battery 2 detected by the temperature detection unit 7.

  Now, external electric devices to be connected to the secondary battery device 1 are electric motors such as electric bikes and electric assist bicycles equipped with a motor that is supplied with power from the secondary battery device 1 via the bidirectional power converter. It is a vehicle. For example, in the case of an electric motorcycle, regenerative power is generated by the motor when the driver releases his hand from the accelerator lever, and the electric power converted by the bidirectional power converter is regenerated to the secondary battery device 1 side, and the secondary battery The battery 2 is charged (hereinafter referred to as regenerative charging). Similarly, in the case of an electrically assisted bicycle, for example, regenerative electric power is generated during traveling downhill, and the secondary battery 2 is recharged.

By the way, when the secondary battery 2 is intermittently charged during discharging, when the state in which the battery voltage becomes lower than the N% voltage is once canceled every time the battery is charged, the timing for correcting the remaining capacity to N%. May be delayed. Hereinafter, how such a case occurs and the processing method according to the first embodiment will be described with reference to the drawings.
FIG. 2 is a graph schematically showing the time change of the battery voltage when regenerative charging occurs during the discharge of the secondary battery 2. In FIG. 2, the vertical axis represents battery voltage (V), and the horizontal axis represents time (seconds).

  In FIG. 2, before and after time t1, the battery voltage changes from a state higher than the N% voltage to a lower state. Then, regenerative charging occurs during time (Td) from time t2 to t3 after time t1, time (Te) from time t4 to t5, and time (Tf) from time t6 to t7, The battery voltage is higher than the N% voltage. That is, the battery voltage is N during the time (Ta) from time t1 to t2, the time (Tb) from time t3 to t4, the time (Tc) from time t5 to t6, and after time t7. The state below the% voltage continues. However, Ta, Tb, and Tc are all shorter than Tn.

  Time measurement of the time during which the state where the battery voltage is lower than the N% voltage continues is first started at time t1 with initialization of the time measurement result. Here, also at times t3, t5, and t7, when the time measurement is started with initialization of the time measurement results, the remaining capacity becomes N% because Ta, Tb, and Tc are all shorter than Tn. The corrected timing is delayed at least from the time t7 until after the lapse of Tn. Therefore, in the first embodiment, the time measurement is only temporarily interrupted between time t2 to t3, t4 to t5, t6 to t7, and the time measurement result from time t1 is the time It will be taken over until t7.

Specifically, even when the battery voltage is higher than the N% voltage, when charging is occurring, the time measurement once started is interrupted and the time measurement result is put on hold. After that, when charging is finished and the battery voltage becomes lower than the N% voltage again, when the timing of the duration that has been interrupted is resumed, the timing results that have been held until then are taken over. To do.
Thereby, for example, the remaining capacity is corrected to N% at time tx when the following expression (1) is established. However, time tx is a time after time t7, and Tx is a time from time t7 to tx.

  Tn = Ta + Tb + Tc + Tx (1)

Below, operation | movement of the remaining capacity correction apparatus 3 mentioned above is demonstrated using the flowchart which shows it. The following processing is executed by the CPU 61 in accordance with a control program stored in the ROM 62 in advance.
FIG. 3 is a flowchart showing a processing procedure of the CPU 61 of the remaining capacity correction device 3 according to the first embodiment. FIG. 4 is a flowchart showing a processing procedure of the CPU 61 for calculating the charging current and the discharging current. The battery voltage is also calculated by the same process as in FIG. 4, but the description thereof is omitted. The processes in FIGS. 3 and 4 are started at a 250 ms period and a 10 ms period, but are not limited thereto.

In FIG. 3, “number of detections” indicating the count result of the number of times when the battery voltage is determined to be lower than the N% voltage, and “N” indicating whether the “number of detections” is greater than the number of N% determinations. The “% detection flag” is stored in the RAM 63. When the N% detection flag is set to “1” by the process of FIG. 3, the remaining capacity data of the secondary battery 2 is corrected to N% by a remaining capacity correction process (not shown).
In addition, the “charge current” and “discharge current” calculated in FIG. 4, “additional charge current (hereinafter also referred to as Ic)”, “additional discharge current ( Hereinafter, “Id)” and “addition counter” are stored in the RAM 63. The “charging current” calculated by the process of FIG. 4 is referred to by the process of FIG.

  When the process of FIG. 3 is activated, the CPU 61 determines whether or not the battery voltage (the voltage obtained by averaging the voltages of the secondary batteries 2) is lower than the N% voltage (S11). Here, the voltage value of the N% voltage (for example, 3.1 V in the case of the 10% voltage) is read from the ROM 62. When the battery voltage is not lower than the N% voltage (S11: NO), the CPU 61 determines that the value of the charging current calculated in step S27 of FIG. It is determined whether it is larger, that is, whether the secondary battery 2 is charged (S12).

  When the secondary battery 2 is not charged (S12: NO), the CPU 61 clears the number of detections to zero (S15). Thereby, the number of detections can be initialized in advance before time t1 shown in FIG. When the secondary battery 2 is charged (S12: YES) or when the process of step S15 is completed, the CPU 61 clears the N% detection flag (S16), and ends the process of FIG.

  If the battery voltage is lower than the N% voltage in step S11 (S11: YES), the CPU 61 increments the number of detections by 1 (S17), and then the number of detections is greater than the N% determination number (Cn described above). Is determined (S18). The value of Cn is read from the RAM 63. If the number is greater than the N% determination number (S18: YES), the CPU 61 sets an N% detection flag (S19) and ends the process of FIG. On the other hand, if it is not greater than the N% determination count (S18: NO), the CPU 61 shifts the processing to step S16 in order to clear the N% detection flag.

  Next, the process of FIG. 4 will be described. In the process of FIG. 4, the charging / discharging current is captured every time the system is activated at a cycle of 10 ms, and the captured current is divided into a charging current and a discharging current, and is accumulated separately as an additional charging current and an additional discharging current. When the process of FIG. 4 is started for the 25th time, the current obtained by dividing each of the accumulated additional charging current and the additional discharging current by 25 (average current for 250 ms) is set as the charging current and the discharging current. .

  When the processing of FIG. 4 is activated, the CPU 61 captures a digital detection value (hereinafter also referred to as Icd) related to the charge / discharge current from an A / D converter (not shown) (S21), and the captured detection value indicates It is determined whether or not the current is a current in the charging direction (S22). Whether the current is in the charging direction is determined by the polarity of the detected value. When the current is in the charging direction (S22: YES), the CPU 61 adds the absolute value of Icd to the added charging current (Ic) (S23). On the other hand, when the current is not in the charging direction (S22: NO), the CPU 61 adds the absolute value of Icd to the added discharge current (Id) (S24).

  When the process of step S23 or S24 is finished, the CPU 61 increments the addition counter by 1 (S25), and then determines whether or not the addition counter is 25 (S26). When the addition counter is not 25 (S26: NO), the CPU 61 waits for the process of FIG. 4 to be started again after 10 ms, and temporarily ends the process of FIG.

  When the addition counter is 25, that is, when the detection value of the charging / discharging current is fetched 25 times and the process of distributing the charging current and the discharging current each time is finished, the CPU 61 sets the value of the additional charging current (Ic) to 25. After the value divided by is set as the charging current (S27), Ic is cleared to zero (S28). Next, the CPU 61 sets the value obtained by dividing the value of the added discharge current (Id) by 25 as the discharge current (S29), then clears Id to zero (S30), further clears the addition counter to zero (S31), and FIG. Terminate the process.

As described above, according to the first embodiment, the voltage of the secondary battery detected in time series is not lower than the N% voltage, and the current in the charging direction among the charge / discharge currents detected in time series is calculated. When the average value of the charging current is larger than 0, when it is determined that the secondary battery is being charged, the counting of the number of times that the voltage of the secondary battery is determined to be lower than the N% voltage is interrupted.
Thereby, when charging occurs in the secondary battery and the voltage becomes higher than the N% voltage, the count result (number of detections) of the number of times that the voltage of the secondary battery is determined to be lower than the N% voltage is 0. Held without being initialized. Then, when the charging is finished and the voltage of the secondary battery becomes lower than the N% voltage, the count of the number is resumed, and the count result that has been held until then is taken over by the count of the number of times of restart. .
Therefore, even when charging occurs during the determination for correcting the remaining capacity of the secondary battery, the secondary capacity can be corrected appropriately by continuing the determination before and after charging. It is possible to provide a battery remaining capacity correcting method, a secondary battery remaining capacity correcting apparatus, and a secondary battery apparatus.

Further, the secondary battery remaining capacity correction device integrates the remaining capacity of the secondary battery and corrects the accumulated remaining capacity.
Therefore, even when charging occurs during the determination for correcting the remaining capacity of the secondary battery, the secondary capacity can be corrected appropriately by continuing the determination before and after charging. The battery remaining capacity correction device can be applied to a secondary battery device.

(Embodiment 2)
The first embodiment is a mode in which the time measurement result is taken over even if regenerative charging occurs after the time measurement of the time during which the battery voltage is lower than the N% voltage is once started. The second embodiment is a form in which the time measurement once started is stopped during charging and the time measurement result is initialized depending on the relationship with the time during which regenerative charging is performed.

  FIG. 5 is a graph schematically showing changes in battery voltage over time when regenerative charging with a long duration occurs during discharge of the secondary battery 2. As in FIG. 2, the vertical axis represents the battery voltage (V), and the horizontal axis represents time (seconds). In FIG. 5, the change in the battery voltage up to time t4 is the same as in FIG. 2, whereas the duration of regenerative charging that occurred at time t4 is longer than in FIG. Thus, when the ratio of regenerative charging increases with respect to discharge, the remaining capacity when the remaining capacity of the secondary battery starts to count the time during which the battery voltage is lower than the N% voltage continues. It is appropriate to stop the determination for correcting the remaining capacity when approaching.

  Therefore, in the second embodiment, the time measurement is stopped when the integrated value of the charging current during regenerative charging is greater than the integrated value of the discharging current during discharging by a predetermined value (α) or more. Thereby, for example, at the time ty when the following expression (2) is established, a series of determination processes for correcting the remaining capacity to N% is stopped. However, time ty is a time after time t4. Further, α is a value whose absolute value is about 0.1% of the learning capacity of the secondary battery 2 and may take a negative value.

(Integrated value of charging current between times t2 and t3)
+ (Integrated value of charging current from time t4 to ty)
-(Integrated value of discharge current between time t1 and t2)
− (Integrated value of discharge current from time t3 to t4)> α (2)

Below, operation | movement of the remaining capacity correction apparatus 3 which concerns on Embodiment 2 is demonstrated using the flowchart which shows it.
FIG. 6 is a flowchart showing a processing procedure of the CPU 61 of the remaining capacity correction device 3 according to the second embodiment. Of the processing shown in FIG. 5, the processing from step S111 to S119 is the same as the processing from step S11 to S19 shown in FIG. In addition, each of the processes in steps S112, S115, and S116 corresponds to the processes in steps S12, S15, and S16 shown in FIG.
The “integrated charge / discharge current” indicating the integrated value of the charge / discharge current is stored in the RAM 63.

  When the process of FIG. 6 is started, the CPU 61 adds and subtracts the values of the charging current and the discharging current with respect to the integrated charging / discharging current. Each of the charging current and the discharging current is calculated in steps S27 and S29 in the processing shown in FIG. 4 of the first embodiment, and is stored in the RAM 63. Thereafter, the CPU 61 determines whether or not the battery voltage is lower than the N% voltage (S111). If not lower (S111: NO), the value of the charging current is greater than 0, that is, the secondary battery 2 is It is determined whether or not the battery is charged (S112).

  When the secondary battery 2 is not charged (S112: NO), the CPU 61 clears the number of detections to zero after clearing the accumulated charge / discharge current to zero (S113) (S115). Thereby, the integrated charge / discharge current and the number of detections can be initialized in advance before time t1 shown in FIG. Thereafter, the CPU 61 clears the N% detection flag (S116) and ends the process of FIG.

  When the secondary battery 2 is charged in step S112 (S112: YES), the CPU 61 determines whether or not the integrated charge / discharge current is larger than α (see formula (2)) (S114). (S114: NO), the process proceeds to step S116. On the other hand, when larger than α (S114: YES), the CPU 61 shifts the processing to step S115. Thereby, the count result of the number of times when the battery voltage is determined to be lower than the N% voltage is initialized (cleared).

  In addition, the same code | symbol is attached | subjected to the location corresponding to Embodiment 1, and the detailed description is abbreviate | omitted.

As described above, according to the second embodiment, when the charging occurs and the counting of the number of times that the voltage of the secondary battery is determined to be lower than the N% voltage is interrupted, the counting of the number of times is started. When the value of the accumulated charge / discharge current obtained by integrating the charge / discharge current later is larger than α, the count result of the number of times is initialized to zero.
Therefore, when the secondary battery is charged and the remaining capacity of the secondary battery approaches the remaining capacity when the counting is started, the determination for correcting the remaining capacity is repeated from the beginning. Is possible.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Secondary battery apparatus 2 Secondary battery 3 Remaining capacity correction apparatus 4 Voltage detection part 5 Current detection part 6 Control part 61 CPU
63 RAM
8 Communication Department

Claims (5)

When the voltage and charge / discharge current of the secondary battery are detected in time series and the remaining capacity is integrated, the number of times that the detected voltage is determined to be lower than the predetermined voltage is counted, and the counted number is greater than the predetermined number of times, In the secondary battery remaining capacity correction method for correcting the remaining capacity to a predetermined capacity,
When it is determined that the detected voltage is not lower than the predetermined voltage, it is determined whether or not the secondary battery is charged based on the detected charge / discharge current,
When it is determined that the battery is charged, the counting of the number of times is interrupted. Accumulating the charge / discharge current after determining that the detected voltage is lower than the predetermined voltage,
When the counting of the number of times is interrupted, it is determined whether the integrated value of the charge / discharge current is larger than a predetermined value,
The secondary battery remaining capacity correction method according to claim 1, wherein the count value of the number of times is initialized when it is determined that the value is greater than a predetermined value. When the voltage and charge / discharge current of the secondary battery are detected in time series and the remaining capacity is integrated, the number of times that the detected voltage is determined to be lower than the predetermined voltage is counted, and the counted number is greater than the predetermined number of times, In the secondary battery remaining capacity correction device for correcting the remaining capacity to a predetermined capacity,
If it is determined that the detected voltage is not lower than the predetermined voltage, means for determining whether or not the secondary battery is charged based on the detected charge / discharge current;
The secondary battery remaining capacity correction device, wherein the number of times is interrupted when it is determined that the means is charged. Integrating means for integrating charge / discharge current after determining that the detected voltage is lower than the predetermined voltage;
A determination means for determining whether or not the integrated value of the integrating means is greater than a predetermined value when counting the number of times is interrupted,
4. The secondary battery remaining capacity correction device according to claim 3, wherein, when the determination unit determines that the determination unit is larger than a predetermined value, the count value of the number of times is initialized. 5. .   5. A secondary battery device comprising: the remaining capacity correcting device for a secondary battery according to claim 3; and one or more secondary batteries whose remaining capacity is corrected by the remaining capacity correcting device.

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