JP5687025B2 - Secondary battery capacity calculation device, secondary battery capacity calculation method and program - Google Patents

Description

  The present invention relates to a secondary battery capacity calculation device, a secondary battery capacity calculation method, and a program.

  As the secondary battery deteriorates over time, the upper limit amount of electricity (dischargeable capacity) that can be stored in a fully charged state changes with a predetermined fully charged voltage. Therefore, it is desired to grasp the dischargeable capacity during use and the capacity in the actual use state. Thus, for example, Patent Document 1 below describes a technique for estimating the dischargeable capacity of a secondary battery based on the voltage value during discharge when the secondary battery is discharged with a constant current.

JP 2007-178401 A

  However, the above prior art requires that the secondary battery be fully charged once, and knows the amount of electricity (remaining capacity) stored in the secondary battery in any charged state of the secondary battery. I couldn't.

  The present invention has been made in view of the above problems, and its purpose is to know the amount of electricity remaining in the secondary battery in any state of charge of the secondary battery even in a state where the deterioration of the secondary battery has progressed. A secondary battery capacity calculation device, a secondary battery capacity calculation method, and a program are provided.

  In order to achieve the above object, a secondary battery capacity calculation device according to the present invention discharges a secondary battery from a fully charged state with a constant current for each dischargeable capacity corresponding to the deterioration state of the secondary battery. Storage means for storing discharge characteristic data indicating the relationship between the voltage of the secondary battery and the discharge elapsed time, specifying means for specifying the dischargeable capacity of the target secondary battery, and the target secondary battery Based on the measuring means for measuring the voltage, the discharge characteristic data corresponding to the dischargeable capacity specified by the specifying means stored in the storage means, and the voltage measured by the measuring means, the target secondary battery Calculating means for calculating the amount of electricity stored in the battery.

  In one aspect of the present invention, the storage means shows a relationship between a dischargeable capacity according to the deterioration state of the secondary battery and a voltage drop rate when discharging at a constant current from a given discharge start voltage. Further storing relationship data, the measuring means measures a voltage drop rate when the target secondary battery is discharged at the constant current from the given discharge start voltage, and the specifying means Based on the relationship data and the measured voltage drop rate, the dischargeable capacity of the target secondary battery is specified.

  In one aspect of the present invention, the secondary battery capacity calculation device according to the identification information of the secondary battery, the dischargeable capacity specified by the specifying means for the secondary battery, and the usage period of the secondary battery Recording means for associating and recording an effective period determined in advance, and identification information acquisition means for acquiring identification information of the target secondary battery, wherein the specifying means is acquired by the identification information acquisition means If it is within the effective period recorded in the recording means in association with the identification information, the dischargeable capacity of the target secondary battery is recorded in the recording means in association with the identification information. The capacity is assumed.

  In one aspect of the present invention, when the specifying unit is not within an effective period recorded in the recording unit in association with the identification information acquired by the identification information acquiring unit, the discharge of the target secondary battery is performed. The possible capacity is specified based on the relational data and the measured voltage drop rate.

  In one aspect of the present invention, the secondary battery capacity calculating device, when at least one of the dischargeable capacity specified by the specifying means or the amount of electricity calculated by the calculating means is less than a threshold value determined for each, A warning display means for displaying a warning is further included.

  In one aspect of the present invention, the secondary battery capacity calculation device further includes a charging unit for charging the target secondary battery.

  The secondary battery capacity calculation method according to the present invention provides a voltage of the secondary battery when the secondary battery is discharged at a constant current from a fully charged state for each dischargeable capacity corresponding to the deterioration state of the secondary battery. Storing the discharge characteristic data indicating the relationship between the discharge time and the discharge time in the storage means, the specifying step for specifying the dischargeable capacity of the target secondary battery, and the measuring step for measuring the voltage of the target secondary battery And the electric power stored in the target secondary battery based on the discharge characteristic data corresponding to the dischargeable capacity specified in the specific step and the voltage measured in the measurement step stored in the storage means And a calculation step for calculating the quantity.

  The program according to the present invention includes, for each dischargeable capacity corresponding to the deterioration state of the secondary battery, the voltage of the secondary battery and the elapsed discharge time when the secondary battery is discharged at a constant current from the fully charged state. Storage means for storing discharge characteristic data indicating the relationship between the above, a specifying means for specifying the dischargeable capacity of the target secondary battery, a measuring means for measuring the voltage of the target secondary battery, and a storage in the storage means Calculation means for calculating the amount of electricity stored in the target secondary battery based on the discharge characteristic data according to the dischargeable capacity specified by the specifying means and the voltage measured by the measurement means It is a program for causing a computer to function.

  According to one embodiment of the present invention, it is possible to know the amount of electricity remaining in a secondary battery in an arbitrary charging state of the secondary battery even in a state where the deterioration of the secondary battery has progressed.

It is a functional block diagram of the secondary battery capacity calculation device concerning this embodiment. It is a figure which shows an example of the discharge characteristic data of a secondary battery. It is a figure which shows an example of the voltage drop speed in a predetermined voltage. It is a figure which shows an example of relationship data. It is a figure explaining an example of the process which calculates the remaining capacity of a secondary battery. It is a figure which shows the relationship between the use period of a secondary battery, and an effective period. It is a figure which shows an example of measurement log | history data. It is a figure which shows an example of the flowchart of the calculation process of remaining capacity. It is a figure which shows an example of the flowchart of the specific process of dischargeable capacity | capacitance. It is a figure explaining the identification method of the dischargeable capacity | capacitance of the secondary battery which concerns on a 1st example. It is a figure explaining the identification method of the dischargeable capacity | capacitance of the secondary battery which concerns on a 1st example. It is a figure explaining the identification method of the dischargeable capacity | capacitance of the secondary battery which concerns on a 2nd example. It is a figure explaining the identification method of the dischargeable capacity | capacitance of the secondary battery which concerns on a 2nd example.

  Hereinafter, an embodiment for carrying out the present invention (hereinafter referred to as an embodiment) will be described with reference to the drawings.

  In FIG. 1, the functional block diagram of the secondary battery capacity calculation apparatus 10 which concerns on this embodiment was shown. As shown in FIG. 1, the secondary battery capacity calculation device 10 includes a power supply unit 100, a battery information acquisition unit 102, a battery information storage unit 104, a battery identification information reading unit 106, a measurement condition setting unit 108, and a discharge control unit 110. A discharge unit 112, a data measurement unit 114, a dischargeable capacity specifying unit 116, a remaining capacity calculation unit 118, a warning determination unit 120, a display unit 122, a measurement history information recording unit 124, and a remeasurement necessity determination unit 126.

  The functions of the above-described units are information that can be read by the secondary battery capacity calculation device 10 including hardware such as a control unit such as a CPU, a storage unit such as a memory, and an input / output unit that transmits and receives data with an external device It may be realized by reading and executing a program stored in a storage medium. The program may be supplied to the secondary battery capacity calculation device 10 by an information storage medium such as an optical disk, a magnetic disk, a magnetic tape, a magneto-optical disk, or a flash memory, or via a data communication network such as the Internet. It may be supplied to the secondary battery capacity calculation device 10.

  The power supply unit 100 is connected to the AC power supply 20 and supplies driving power to each unit of the secondary battery capacity calculation device 10.

  The battery information acquisition unit 102 obtains the secondary battery from a fully charged state with a constant current for each attribute of the secondary battery model, date of manufacture, and the dischargeable capacity corresponding to the deterioration state of the secondary battery. Secondary battery information including discharge characteristic data indicating the relationship between the voltage of the secondary battery when discharged and the elapsed discharge time is acquired. The battery information acquisition unit 102 may acquire secondary battery information about a plurality of secondary batteries, and the secondary battery information may be acquired by receiving information input from a user, or a database (not shown). Alternatively, the information may be read from the information storage medium.

  The battery information storage unit 104 stores secondary battery information for each secondary battery acquired by the battery information acquisition unit 102 and various data used for estimating the secondary battery capacity (remaining capacity and dischargeable capacity). . Hereinafter, an example of data stored in the battery information storage unit 104 will be described.

  FIG. 2 shows an example of the discharge characteristic data of the secondary battery stored in the battery information storage unit 104. The discharge characteristic data shown in FIG. 2 indicates that the secondary battery is fully charged for each dischargeable capacity corresponding to the deterioration state of one secondary battery specified by the attribute information such as the model and the manufacturing date. 3 shows the relationship between the voltage of the secondary battery and the discharge elapsed time when discharged at a constant current from the above. The discharge characteristic data shown in FIG. 2 shows data for four dischargeable capacities of 100%, 70%, 40%, and 20%. The dischargeable capacity X% indicates a ratio to the dischargeable capacity when new. In the discharge characteristic data shown in FIG. 2, the horizontal axis indicates the discharge time and the vertical axis indicates the battery voltage. The discharge time on the horizontal axis represents a secondary battery having a dischargeable capacity of 100% at a predetermined constant current. When discharging from the fully charged state, the time to reach the fully discharged state is a value normalized as 1 unit time. The characteristics shown in FIG. 2 are obtained for each of a plurality of discharge currents as necessary. When calculating the dischargeable capacity from the voltage drop rate during constant current discharge described later, the discharge current value of the characteristic data to be used is Use the same current value. The battery information storage unit 104 stores discharge characteristic data as shown in FIG. 2 for each secondary battery specified by the attribute information such as model and date of manufacture.

  FIG. 3 shows an example of the voltage drop rate at a predetermined voltage for each discharge curve shown in the discharge characteristic data of the secondary battery. In the example shown in FIG. 3, the amount of voltage drop when discharging with a constant current over a predetermined time (for example, 0.1 unit time) at 3.9 V and 3.7 V is indicated by a thick line. In FIG. 3, LX-Y is a line segment indicating a voltage drop in a predetermined period (for example, 0.1 unit time) in the voltage Y (V) for the discharge curve having a dischargeable capacity of X%. Remember the slope of.

  FIG. 4 shows an example of relational data showing the relation between the dischargeable capacity of the secondary battery and the voltage drop speed at a predetermined voltage. In the relational data shown in FIG. 4, the horizontal axis indicates the dischargeable capacity, and the vertical axis indicates the voltage drop rate. In FIG. 4, data corresponding to the voltage drop rates from 3.9 V and 3.7 V are plotted. Yes. The line connecting the plotted points may be generated by, for example, linear, least square method, or other known polynomial approximation curves, and by using these approximation curves, a voltage from a predetermined voltage for the secondary battery is used. The dischargeable capacity corresponding to the voltage drop speed can be estimated based on the drop speed. Of course, the measurement start voltage in the relational data is not limited to the illustrated example.

  The battery identification information reading unit 106 reads the identification information of the secondary battery stored in, for example, an IC tag or a barcode attached to the secondary battery using the reader 30 connected thereto. The identification information of the secondary battery may include information on the model and date of manufacture of the secondary battery, and the information on the model and date of manufacture of the secondary battery is associated with each identification information in the battery information storage unit. 104 may be stored. The identification information of the secondary battery is given a unique value so that each secondary battery having the same model and date of manufacture can be identified.

  The measurement condition setting unit 108 sets measurement conditions in a discharge test for a secondary battery. For example, a discharge current value (1, 2, 5, 10, 20, 30 A, etc.) is used for discharging. The measurement start voltage (3.8, 3.85, 3.9, 3.95 V, etc.) and the measurement time (0.05, 0.1, 0.15, 0.2 unit time, etc.) are set. The measurement condition setting unit 108 may set the measurement condition based on an input from the user, or the measurement condition is stored in advance for each attribute information of the secondary battery, and the attribute information of the secondary battery is stored. It is also possible to read and set the measurement conditions using as a key.

  The discharge control unit 110 controls the discharge unit 112 according to the measurement conditions set by the measurement condition setting unit 108 to discharge the secondary battery. For example, the discharge current control unit controls the variable resistance of the discharge unit 112 according to the discharge current set by the measurement condition setting unit 108 so that the discharge current from the secondary battery becomes equal to the set discharge current. In addition to controlling, when the measurement time has elapsed from the measurement start voltage, the discharge is stopped.

  The discharge unit 112 includes a terminal connected to the positive electrode and the negative electrode of the secondary battery and a variable resistor, and discharges the secondary battery based on control by the discharge control unit 110.

  The data measuring unit 114 measures a discharge current from the secondary battery, a voltage of the secondary battery (voltage at the time of discharge), an open voltage of the secondary battery, and the like. The data measurement unit 114 outputs the value of the discharge current from the secondary battery to the discharge control unit 110, and the voltage of the secondary battery measured after the start of discharge is set to the measurement start voltage set by the measurement condition setting unit 108. When it reaches, the measurement time starts to be measured, and when the measurement time has elapsed, the measurement end voltage is measured. The data measuring unit 114 measures the open voltage of the secondary battery at a given timing. The data measured by the data measuring unit 114 is output to the dischargeable capacity specifying unit 116 and the remaining capacity calculating unit 118.

  The dischargeable capacity specifying unit 116 is identified by the identification information based on the identification information of the secondary battery output from the data measurement unit 114, the measurement start voltage, the measurement time, and the measurement end voltage. Identify the dischargeable capacity of the battery. For example, the dischargeable capacity specifying unit 116 refers to the relationship data specified by the attribute of the secondary battery from the battery information storage unit 104 based on the identification information of the secondary battery. The dischargeable capacity corresponding to the voltage drop rate calculated based on the measurement start voltage, the measurement time, and the measurement end voltage output from the data measurement unit 114 may be obtained. The voltage drop rate is calculated by dividing the value obtained by subtracting the measurement end voltage from the measurement start voltage by the measurement time.

  The remaining capacity calculation unit 118 calculates the amount of electricity (remaining capacity) remaining in the secondary battery whose dischargeable capacity is specified by the dischargeable capacity specifying unit 116, the discharge characteristic data of the secondary battery, and the data measurement unit. Based on the open-circuit voltage of the secondary battery measured at 114. For example, the remaining capacity calculation unit 118 refers to the discharge characteristic data from the battery information storage unit 104 using the model of the secondary battery, the manufacturing date, and the dischargeable capacity as a key, and in the discharge characteristic data, The discharge elapsed time corresponding to the open circuit voltage is specified. Then, the remaining capacity calculation unit 118 discharges the discharge characteristic data to a value obtained by subtracting the specified elapsed discharge time from the discharge end time indicated in the discharge characteristic data (the value obtained after converting the unit time into real time). The remaining capacity may be calculated by multiplying the discharge current (constant current) at.

  FIG. 5 is a diagram illustrating an example of a process for calculating the remaining capacity of the secondary battery. The example shown in FIG. 5 describes the case where the dischargeable capacity of the secondary battery is 70%, and first corresponds to the open-circuit voltage value measured for the secondary battery based on the discharge characteristic data of 70%. The discharge elapsed time is obtained, and the discharge duration when complete discharge is performed on 70% of the discharge characteristic data is obtained. The dischargeable time after the open-circuit voltage measurement time is calculated from these differences, and this value is used as the discharge characteristic. The remaining capacity is calculated by multiplying the discharge current in the data.

  The remaining capacity calculation unit 118 basically corresponds to the plurality of dischargeable capacities so as to be able to correspond to the discharge characteristic data of the dischargeable capacity that matches the specified dischargeable capacity in the battery information storage unit 104. The discharge characteristic data is stored. However, there are cases where discharge characteristic data matching the specified dischargeable capacity cannot be obtained. In such a case, the discharge characteristic data of the dischargeable capacity closest to the specified dischargeable capacity may be selected. The remaining capacity calculation unit 118 selects two discharge characteristic data sandwiching the specified dischargeable capacity (X1) (one dischargeable capacity is X2, the other is X3, and X2 <X1 <X3). The remaining capacity is calculated based on each discharge characteristic data (the remaining capacity based on X2 is Y2, and the remaining capacity based on X3 is Y3), and the remaining capacity Y1 = Y2 · (X3-X1) for the remaining capacity calculating unit 118X1 ) / (X3-X2) + Y3 · (X1-X2) / (X3-X2).

  The warning determination unit 120 determines whether or not the dischargeable capacity specified by the dischargeable capacity specifying unit 116 and the remaining capacity calculated by the remaining capacity calculation unit 118 are equal to or greater than a threshold value determined for each. A warning is output when the value is below the threshold. For example, when the dischargeable capacity specified by the dischargeable capacity specifying unit 116 is less than a first threshold (for example, 70%), the warning determination unit 120 displays a warning that prompts replacement of the secondary battery. As good as In addition, the warning determination unit 120 issues a warning prompting charging of the secondary battery when the remaining capacity calculated by the remaining capacity calculation unit 118 is less than a second threshold value (for example, 50%) with respect to the dischargeable capacity. It may be displayed.

  The display unit 122 may be realized by a liquid crystal display, and displays information input screens such as battery information and measurement conditions, warning information output from the warning determination unit 120, and the like.

  The measurement history information recording unit 124 includes the identification information read by the battery identification information reading unit 106 for the secondary battery, the dischargeable capacity specified by the dischargeable capacity specifying unit 116 for the secondary battery, and the secondary battery. It records in association with the effective period (effective period from the measurement date) determined according to the usage period. The use period of the secondary battery may be the period from the date of manufacture of the secondary battery to the present, or the period from the date when the identification information is first read by the battery identification information reading unit 106 for the secondary battery to the present. Also good.

  FIG. 6 shows the relationship between the usage period and the effective period of the secondary battery. The effective period is a period until the dischargeable capacity once specified for the secondary battery needs to be measured again. The curve shown in FIG. 6 shows the relationship between the use period and the dischargeable capacity. For example, when the use period is divided into the first period, the second period, and the third period, the decrease rate of the dischargeable capacity is In order from the largest, the first period> the second period> the third period. The effective period is determined according to the use period, and may be set to have a longer cycle as the use period becomes longer, for example. By doing so, the period when the decrease rate of the dischargeable capacity is large is shorter than the period when the decrease rate of the dischargeable capacity is small. In the example shown in FIG. 5, TA <TB <TC when the effective period TA in the first period, the effective period TB in the second period, and the effective period TC in the third period are set.

  FIG. 7 shows an example of measurement history data recorded by the measurement history information recording unit 124. As shown in FIG. 7, the measurement history data may be composed of, for example, records in which identification information of the secondary battery, dischargeable capacity (%), effective period, and measurement date are associated with each other.

  The remeasurement necessity determination unit 126 can discharge the secondary battery based on whether or not the identification information of the secondary battery is within the effective period indicated in the measurement history data recorded in the measurement history information recording unit 124. Determine whether the capacity needs to be remeasured. The remeasurement necessity determination unit 126 records the case where the measurement history data is not recorded in the measurement history information recording unit 124 in association with the identification information read by the battery identification information reading unit 106 for the secondary battery, and the measurement history data is recorded. Even if it is, it is determined that the dischargeable capacity of the secondary battery needs to be measured again if it is not within the effective period indicated by the measurement history data. On the other hand, the re-measurement necessity determination unit 126 determines that it is not necessary to re-measure the dischargeable capacity of the secondary battery when none of the above applies, and discharge is possible indicated by the measurement history data. Let the capacity be the dischargeable capacity of the secondary battery.

  Next, a flow of processing performed by the secondary battery capacity calculation device 10 will be described with reference to an example of a flowchart of calculation processing of the remaining capacity of the secondary battery shown in FIG.

  As shown in FIG. 8, the secondary battery capacity calculation device 10 reads the identification information of the target secondary battery (S1001), and refers to the measurement history data recorded for the read identification information (S1002). .

  When the secondary battery capacity calculation device 10 is within the effective period indicated in the above-described measurement history data (S1003: Y), the target secondary battery can be discharged with the dischargeable capacity indicated in the measurement history data. Used as a capacity (S1004). On the other hand, when the secondary battery capacity calculation device 10 is not within the effective period indicated by the above-described measurement history data (S1003: N), the secondary battery capacity calculation apparatus 10 executes a process for specifying the dischargeable capacity of the target secondary battery. (S1005).

  In FIG. 9, the flowchart of the specific process of the dischargeable capacity | capacitance of a secondary battery was shown. As shown in FIG. 9, the secondary battery capacity calculation apparatus 10 sets discharge conditions, measurement start voltage, measurement time, and other measurement conditions (S2001), and then starts discharging the secondary battery (S2002). When the voltage measured for the secondary battery has not reached the measurement start voltage (S2003: N), the secondary battery capacity calculation device 10 stands by, and the voltage measured for the secondary battery becomes the measurement start voltage. When the time is reached (S2003: Y), the time measurement is started (S2004). Then, the secondary battery capacity calculation device 10 stands by when the time to be measured has not reached the set measurement time (S2005: N), and waits and when the time to be measured has reached the set measurement time ( S2005: Y), the voltage at that time (measurement end voltage) is measured and recorded (S2006).

  The secondary battery capacity calculation device 10 calculates a voltage drop rate from the measurement start voltage, the measurement end voltage, and the measurement time (S2007), and based on the calculated voltage drop rate, a corresponding discharge from the stored relational data. The possible capacity is specified (S2008), and the process returns.

  Returning to the flowchart of FIG. When the dischargeable capacity specified in S1004 or S1005 is less than a threshold value (for example, 70%) (S1006: N), the secondary battery capacity calculation device 10 displays a warning that prompts replacement of the secondary battery (S1007). Next, the secondary battery capacity calculation device 10 measures the open circuit voltage of the secondary battery (S1008), and based on the measured open circuit voltage and the discharge characteristic data of the secondary battery, The remaining capacity is calculated (S1009).

  When the calculated remaining capacity is less than a threshold value (for example, 50% of the fully charged state) (S1010: Y), the secondary battery capacity calculation device 10 displays a warning that prompts charging of the secondary battery. (S1011). The secondary battery capacity calculation device 10 displays the remaining capacity of the secondary battery and the dischargeable capacity (S1012), according to the identification information of the secondary battery, the dischargeable capacity, and the usage period of the secondary battery. The determined effective period and the measurement date are recorded in association with each other (S1013), and the process ends.

  According to the secondary battery capacity calculation device 10 according to the present embodiment described above, the amount of electricity remaining in the secondary battery in any state that does not depend on the deterioration state or the charge state of various secondary batteries. I can know. In addition, the re-measurement of the dischargeable capacity reduces the processing load by using the dischargeable capacity measured in the past until the effective period corresponding to the usage period of the secondary battery elapses.

  The present invention is not limited to the above embodiment. For example, the secondary battery capacity calculation device 10 may further include a charging unit that receives power supplied from an AC power supply and charges the secondary battery. At this time, the charging unit may charge the secondary battery after calculating the remaining capacity or when it is determined that the remaining capacity calculated by the secondary battery capacity calculating device 10 is less than the threshold value. .

  Further, the secondary battery capacity calculation device 10 holds data storing the relationship between the open-circuit voltage of the secondary battery and the remaining capacity for each dischargeable capacity, and uses the measured open-circuit voltage as a key to store the above data. The remaining capacity may be acquired with reference to FIG.

  Further, the measurement start voltage and the measurement end voltage used when the secondary battery capacity calculation device 10 specifies the dischargeable capacity are not limited to the above example. For example, the secondary battery capacity calculation device 10 stores a set of a plurality of measurement start voltages and measurement end voltages, and includes a measurement start voltage and a measurement end including a measurement start voltage that is smaller than the battery voltage measured for the secondary battery. A set of voltages may be selected. In addition, the secondary battery capacity calculation device 10 discharges the secondary battery without charging it if the voltage of the secondary battery is equal to or higher than the selected measurement start voltage even if the secondary battery is not fully charged. It is good also as starting the process which specifies possible capacity | capacitance. Of course, the process of specifying the dischargeable capacity may be started after the secondary battery is once fully charged.

  In the above embodiment, the example in which the dischargeable capacity of the secondary battery is specified based on the voltage drop rate when the secondary battery is discharged at a constant current has been described. However, the dischargeable capacity of the secondary battery is described. The specific processing is not limited to the above example. Hereinafter, another example of the process for specifying the dischargeable capacity of the secondary battery will be described with reference to the drawings.

  First, the 1st example which concerns on the specific method of the dischargeable capacity | capacitance of a secondary battery is demonstrated. In the first example, after the secondary battery is fully charged, the battery voltage after discharging for a predetermined discharge time (for example, T1) with a predetermined current is measured, and the secondary voltage is measured based on the measured battery voltage. Identify the dischargeable capacity of the battery.

  10A and 10B are diagrams illustrating a method for specifying the dischargeable capacity of the secondary battery according to the first example. As shown in FIG. 10A, the value of the battery voltage indicated by the intersection with a predetermined discharge time (for example, T1) is read from the discharge curve of each dischargeable capacity. Then, as shown in FIG. 10B, a curve connecting the points where the read battery voltage and the corresponding dischargeable capacity are plotted is obtained. The secondary battery capacity calculation device 10 specifies the dischargeable capacity corresponding to the battery voltage measured for the secondary battery with reference to the data shown in FIG. 10B. The data shown in FIG. 10B may be generated and stored for a plurality of discharge times (T1, T2, T3, etc.), and the above data may be generated and stored for each attribute of the secondary battery. .

  Next, a second example according to the method for specifying the dischargeable capacity of the secondary battery will be described. In the second example, after the secondary battery is fully charged, discharging is started at a predetermined current, and a discharge time until reaching a predetermined voltage (for example, V1) is measured. Based on the measured discharge time, Specify the dischargeable capacity of the secondary battery.

  11A and 11B are diagrams illustrating a method for specifying the dischargeable capacity of the secondary battery according to the second example. As shown in FIG. 11A, the value of the discharge time indicated by the intersection with a predetermined battery voltage (for example, V1) is read from the discharge curve of each dischargeable capacity. Then, as shown in FIG. 11B, a curve connecting points obtained by plotting the read discharge time and the corresponding dischargeable capacity is obtained. The secondary battery capacity calculation device 10 specifies the dischargeable capacity corresponding to the discharge time measured for the secondary battery with reference to the data shown in FIG. 11B. The data shown in FIG. 11B may be generated and stored for a plurality of battery voltages (V1, V2, V3, etc.), and the above data may be generated and stored for each attribute of the secondary battery. .

  The present invention is mainly applied to a cycle-use battery that repeatedly charges and discharges a secondary battery, but it is needless to say that a secondary battery for backup (assembled battery) may be applied. Further, for example, a lithium ion battery may be used as the secondary battery.

  DESCRIPTION OF SYMBOLS 10 Secondary battery capacity calculation apparatus, 20 AC power supply, 30 Reader, 100 Power supply part, 102 Battery information acquisition part, 104 Battery information storage part, 106 Battery identification information reading part, 108 Measurement condition setting part, 110 Discharge control part, 112 Discharge unit, 114 data measurement unit, 116 dischargeable capacity specifying unit, 118 remaining capacity calculation unit, 120 warning determination unit, 122 display unit, 124 measurement history information recording unit, 126 remeasurement necessity determination unit

Claims (9)

Discharge characteristic data showing the relationship between the voltage of the secondary battery and the elapsed discharge time when the secondary battery is discharged at a constant current from the fully charged state for each dischargeable capacity corresponding to the deterioration state of the secondary battery. Storage means for storing
A specific means for specifying the dischargeable capacity of the target secondary battery,
Measuring means for measuring the voltage of the target secondary battery;
Based on the discharge characteristic data according to the dischargeable capacity specified by the specifying means stored in the storage means and the voltage measured by the measuring means, the amount of electricity stored in the target secondary battery is calculated. A calculating means for calculating;
Recording means for recording the identification information of the secondary battery, the dischargeable capacity specified by the specifying means for the secondary battery, and the effective period determined according to the usage period of the secondary battery,
Look including a identification information acquiring means for acquiring identification information of the secondary battery of the object,
When the identification unit is within the effective period recorded in the recording unit in association with the identification information acquired by the identification information acquisition unit, the dischargeable capacity of the target secondary battery is determined as the identification information. A rechargeable battery capacity calculating device characterized in that the dischargeable capacity is recorded in the recording means in relation to The storage means further stores relationship data indicating a relationship between a dischargeable capacity according to a deterioration state of the secondary battery and a voltage drop rate when discharged at a constant current from a given discharge start voltage,
The measuring means measures the voltage drop rate when the target secondary battery is discharged at the constant current from the given discharge start voltage,
The secondary battery capacity calculation device according to claim 1, wherein the specifying unit specifies a dischargeable capacity of the target secondary battery based on the relation data and the measured voltage drop rate. . When the specifying unit does not fall within the effective period recorded in the recording unit in association with the identification information acquired by the identification information acquiring unit, the dischargeable capacity of the target secondary battery is determined as the relation data. The secondary battery capacity calculating device according to claim 2 , wherein the secondary battery capacity is specified based on the measured voltage drop rate. The apparatus further includes warning display means for displaying a warning when at least one of the dischargeable capacity specified by the specifying means or the amount of electricity calculated by the calculation means is less than a threshold value determined for each. Item 4. The secondary battery capacity calculation device according to any one of Items 1 to 3 . Battery capacity calculating apparatus according to any one of claims 1 to 4, further comprising a charging means for charging the secondary battery of the subject. The storage means has a relationship between a dischargeable capacity of the secondary battery and a voltage of the secondary battery when the secondary battery is discharged at the constant current for a predetermined discharge time from a voltage in a fully charged state. Memorize data
The measuring means measures the voltage of the target secondary battery when the target secondary battery is discharged at the constant current for the predetermined discharge time from the voltage in the fully charged state,
The specifying unit specifies a dischargeable capacity of the target secondary battery based on the data and the measured voltage.
The secondary battery capacity calculation apparatus according to claim 1. The storage means is a data indicating a relationship between a dischargeable capacity of the secondary battery and a discharge time until the secondary battery reaches a predetermined voltage when the secondary battery is discharged at the constant current from a voltage in a fully charged state. Remember
The measuring means measures the discharge time until the target secondary battery reaches the predetermined voltage when discharged from the voltage in the fully charged state with the constant current,
The specifying unit specifies a dischargeable capacity of the target secondary battery based on the data and the measured discharge time.
The secondary battery capacity calculation apparatus according to claim 1. Discharge characteristic data showing the relationship between the voltage of the secondary battery and the elapsed discharge time when the secondary battery is discharged at a constant current from the fully charged state for each dischargeable capacity corresponding to the deterioration state of the secondary battery. Storing in a storage means;
A specific step of identifying the dischargeable capacity of the target secondary battery;
A measuring step of measuring a voltage of the target secondary battery;
Based on the discharge characteristic data according to the dischargeable capacity specified in the specific step stored in the storage unit and the voltage measured in the measurement step, the amount of electricity stored in the target secondary battery is calculated. A calculating step for calculating;
A recording step of associating and recording secondary battery identification information, a dischargeable capacity specified by the specifying means for the secondary battery, and an effective period determined according to a usage period of the secondary battery;
Look including the an identification information acquiring step of acquiring identification information of the secondary battery of the object,
In the specifying step, when the effective period recorded in the recording step is related to the identification information acquired in the identification information acquisition step, the dischargeable capacity of the target secondary battery is determined as the identification information. And a dischargeable capacity recorded in the recording step in association with the secondary battery capacity. Discharge characteristic data showing the relationship between the voltage of the secondary battery and the elapsed discharge time when the secondary battery is discharged at a constant current from the fully charged state for each dischargeable capacity corresponding to the deterioration state of the secondary battery. Storage means for storing
A specific means for specifying the dischargeable capacity of the target secondary battery,
Measuring means for measuring the voltage of the target secondary battery;
Based on the discharge characteristic data according to the dischargeable capacity specified by the specifying means stored in the storage means and the voltage measured by the measuring means, the amount of electricity stored in the target secondary battery is calculated. A calculating means for calculating ;
Recording means for recording the identification information of the secondary battery, the dischargeable capacity specified by the specifying means for the secondary battery, and the effective period determined according to the usage period of the secondary battery,
A program for causing a computer to function as identification information acquisition means for acquiring identification information of the target secondary battery ,
When the identification unit is within the effective period recorded in the recording unit in association with the identification information acquired by the identification information acquisition unit, the dischargeable capacity of the target secondary battery is determined as the identification information. A dischargeable capacity recorded in the recording means in association with the recording means .

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