JP2011153951A - System and program for estimating tendency of deterioration of storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately estimate the tendency of the deterioration of a storage battery. <P>SOLUTION: A system for estimating the tendency of the deterioration of the storage battery comprises an electric discharge characteristic database 4 for storing initial discharge characteristics at a specific discharge current value, a secular change database 5 for storing the tendency of secular changes in the discharge capacity at some discharge current value of the storage battery, and a program 6 for estimating the tendency of the deterioration of the storage battery. The program 6 for estimating the tendency of the deterioration of the storage battery computes initial discharge characteristics to an inputted actual discharge current value on the basis of initial discharge characteristics stored in the electric discharge characteristic database 4, computes discharge characteristics after the passage of time on the basis of an inputted actual discharge time, an actual discharge voltage, and computed initial discharge characteristics in the case that a measured actual discharge voltage is equal to a prescribed voltage or lower, acquires a discharge capacity to a secular value from the secular change database 5 in the case that the measured actual discharge voltage is higher than the prescribed voltage, and computes the discharge characteristics after the passage of time on the basis of the discharge capacity, the actual discharge current value, and the computed initial discharge characteristics. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a storage battery deterioration tendency estimation system and a storage battery deterioration tendency estimation program for estimating characteristics such as capacity and life of a storage battery.

  Storage batteries, such as sealed lead-acid batteries and lithium ion secondary batteries, need to be replaced with new storage batteries when their capacity decreases with the passage of years of use and the capacity reaches a predetermined capacity. . In addition, the expected life of the storage battery is presented by the manufacturer of the storage battery, but the actual life of the storage battery is affected by the use environment, use conditions, and the like. For this reason, in actual operation, it is necessary to know how much the storage battery capacity is at the present time, and to predict the period and remaining life until the end of the life, and to formulate a plan for replacing the storage battery, etc. .

  On the other hand, it is necessary to perform a discharge test to accurately know the current storage battery capacity, but it takes a long time to discharge the storage battery to the end voltage (the voltage at which discharge should be terminated). Can no longer be used. That is, in the case of a storage battery used as a backup power source such as UPS (Uninterruptable Power Supply), the function as the backup power source is lost during the discharge test. For this reason, the technique which can estimate a storage battery capacity | capacitance only by discharging for a short time, without discharging a storage battery to a termination voltage is known (for example, refer patent document 1). For example, the storage battery is discharged for a short time, the terminal voltage of the storage battery is measured, and the storage battery capacity is estimated from the change in the measured voltage.

JP-A-10-040967

  By the way, even if the storage battery has the same rated capacity and expected life, the change in capacity due to aging differs depending on the design concept and the manufacturing process. Moreover, it has also been confirmed by the present inventors that the discharge characteristics of the storage battery differ with age. That is, the discharge curve changes with age, for example, the voltage drop immediately after discharge increases with age, and the higher the discharge rate (discharge current), the greater the voltage drop with age. Has been confirmed. For this reason, unless the capacity change characteristics and discharge characteristics of the storage battery with age are taken into account, the deterioration tendency of the storage battery cannot be estimated accurately and properly, and the storage battery is discharged for a short time, for example, the terminal of the storage battery Even if the storage battery capacity is estimated only from the change in voltage, it is not possible to estimate the correct and appropriate storage battery capacity.

  Then, this invention aims at providing the storage battery deterioration tendency estimation system and storage battery deterioration tendency estimation program which can estimate the deterioration tendency of a storage battery more appropriately.

In order to achieve the above object, the invention described in claim 1 is characterized in that the discharge characteristics of the storage battery in an aged state are initial discharge characteristics, and the discharge characteristics of the storage battery after aging are post-aging discharge characteristics,
An input means for inputting the aging value of the storage battery, the actual discharge current value when the storage battery is actually discharged, the measured actual discharge time, the actual discharge voltage, and the like,
Discharge characteristic storage means for storing initial discharge characteristics at a specific discharge current value;
A secular change storage means for storing a trend of the secular change of the discharge capacity at a discharge current value of the storage battery,
Based on the initial discharge characteristic stored in the discharge characteristic storage means, the initial discharge characteristic with respect to the actual discharge current value input by the input means is calculated as the initial discharge characteristic of the actual discharge current, and input by the input means When the actual discharge voltage is equal to or lower than a predetermined voltage, the post-age discharge with respect to the actual discharge current value is performed based on the actual discharge time, the actual discharge voltage, and the initial discharge characteristics of the actual discharge current input by the input unit. When the actual discharge voltage is higher than the predetermined voltage, the discharge capacity corresponding to the aging value input by the input unit is obtained from the aging storage unit. And a processing means for calculating a post-age discharge characteristic of the actual discharge current based on the obtained discharge capacity, the actual discharge current value, and the initial discharge characteristic of the actual discharge current;
It is a storage battery deterioration tendency estimation system characterized by comprising.

  According to the present invention, when the aging value of the storage battery, the actual discharge current value when the storage battery is actually discharged, or the like is input by the input unit, the initial discharge characteristic with respect to the input actual discharge current value is first realized by the processing unit. Calculated as the initial discharge characteristics of the discharge current. Next, if the input actual discharge voltage is equal to or lower than the predetermined voltage, the post-age discharge with respect to the actual discharge current value is performed based on the input actual discharge time, the actual discharge voltage, and the initial discharge characteristics of the actual discharge current. The characteristic is calculated as the discharge characteristic after aging of the actual discharge current. On the other hand, when the actual discharge voltage is higher than the predetermined voltage, the discharge capacity for the input aging value is acquired from the aging storage means, and the discharge capacity, the actual discharge current value, and the initial discharge characteristics of the actual discharge current Based on the above, the post-age discharge characteristics of the actual discharge current are calculated.

  According to a second aspect of the present invention, in the storage battery deterioration tendency estimation system according to the first aspect, the processing means has a life (period) until a predetermined capacity is reached based on a post-age discharge characteristic of the actual discharge current. ) Is calculated.

  According to a third aspect of the present invention, in the storage battery deterioration tendency estimation system according to the first or second aspect, the initial discharge characteristics are stored for each of the storage batteries having different manufacturing designs in the discharge characteristic storage unit, and the secular change is performed. The storage means stores the tendency of the secular change for each storage battery having a different manufacturing design, and the processing means has an initial discharge characteristic corresponding to the manufacturing design of the storage battery input by the input means and a tendency of the secular change. Based on this, the post-age discharge characteristics of the actual discharge current are calculated.

In the invention according to claim 4, when the discharge characteristics of the storage battery in an unaged state are the initial discharge characteristics, the discharge characteristics of the storage battery after the aging are the discharge characteristics after the aging, the aging value of the storage battery and the actual discharge of the storage battery The actual discharge current value, measured actual discharge time and actual discharge voltage are input,
On the computer,
Based on the initial discharge characteristics at a specific discharge current value, calculating the initial discharge characteristics for the input actual discharge current value as the initial discharge characteristics of the actual discharge current;
When the input actual discharge voltage is equal to or lower than a predetermined voltage, the post-age discharge characteristics with respect to the actual discharge current value are calculated based on the input actual discharge time, the actual discharge voltage, and the initial discharge characteristics of the actual discharge current. A step of calculating the discharge characteristics after the aging of the actual discharge current;
When the actual discharge voltage is higher than the predetermined voltage, based on the tendency of the discharge capacity to change over time at a discharge current value of the storage battery, obtain the discharge capacity for the input aging value, and the acquired discharge capacity and Based on the actual discharge current value and the initial discharge characteristics of the actual discharge current, calculating post-age discharge characteristics of the actual discharge current;
It is a storage battery deterioration tendency estimation program for executing.

  According to the first and fourth aspects of the invention, when the actual discharge voltage measured when the storage battery is actually discharged is equal to or lower than a predetermined voltage, that is, highly reliable measurement data is obtained for an aged storage battery. If so, the post-age discharge characteristics of the actual discharge current are calculated based on the measurement data (actual discharge time and actual discharge voltage). For this reason, it is possible to obtain discharge characteristics after aging of an appropriate actual discharge current based on highly reliable measurement data. On the other hand, when the actual discharge voltage measured when the storage battery is actually discharged is higher than a predetermined voltage, that is, when reliable measurement data is not obtained for an aged storage battery, Based on the discharge capacity corresponding to the value and the initial discharge characteristics, the post-age discharge characteristics of the actual discharge current are calculated. For this reason, the post-aging discharge characteristic of the appropriate actual discharge current based on the aging value of the storage battery can be obtained. Thus, it becomes possible to estimate the deterioration tendency of a storage battery more appropriately by obtaining the discharge characteristics after aging of an appropriate actual discharge current.

  According to the second aspect of the present invention, since the life until reaching the predetermined capacity is calculated, the deterioration tendency of the storage battery can be estimated more appropriately, and measures for the storage battery can be appropriately and promptly performed. Can be done.

  According to the third aspect of the present invention, since the post-aging discharge characteristic of the actual discharge current is calculated based on the initial discharge characteristic corresponding to the production design of the storage battery and the tendency of aging, a more appropriate actual discharge current The discharge characteristics can be obtained after aging. As a result, it becomes possible to estimate the deterioration tendency of the storage battery more appropriately.

It is a schematic block diagram showing a storage battery deterioration tendency estimation system according to an embodiment of the present invention. It is a figure which shows the example of a tendency of the secular change memorize | stored in the secular change database of the system of FIG. It is a flowchart of the storage battery deterioration tendency estimation program of the system of FIG. It is a figure which shows the calculation method of the initial stage discharge curve by the program of FIG. It is a figure which shows an example of the calculation method of the post-age discharge curve by the program of FIG. It is a figure which shows an example of the initial stage discharge curve by the program of FIG. 3, and an aged discharge curve. It is a figure which shows the other example of the calculation method of the aged discharge curve by the program of FIG. It is a figure which shows the other example of the initial stage discharge curve by the program of FIG. 3, and a discharge curve after aging. It is a figure which shows an example of the capacity transition line by the program of FIG. 3, and experimental data. It is a figure which shows an example of the input parameter input with the system of FIG. It is a figure which shows the relationship between the expected lifetime in the system of FIG. 1, and ambient temperature.

  The present invention will be described below based on the illustrated embodiments.

  FIG. 1 is a schematic block diagram showing a storage battery deterioration tendency estimation system 1 according to an embodiment of the present invention. The storage battery deterioration tendency estimation system 1 is a system for estimating characteristics such as the capacity and life of a storage battery, and mainly includes an input unit (input unit) 2, a display unit 3, and a discharge characteristic database (discharge characteristic storage unit) 4. And a secular change database (aging change storage means) 5, a storage battery deterioration tendency estimation program (processing means) 6, and a central processing unit 7 for controlling these, and is constituted by a general-purpose computer. Here, the discharge characteristics of the storage battery in an unaged state (new) are referred to as “initial discharge characteristics”, and the discharge characteristics of the storage battery after the passage of time are referred to as “post-age discharge characteristics”. The case where a sealed lead-acid battery that functions as a backup power source is the target storage battery will be described below.

  The input unit 2 is used to input input parameters such as an aging value of the storage battery, an actual discharge current value when the storage battery is actually discharged, a measured actual discharge time, and an actual discharge voltage thereof, and is configured by a keyboard, a mouse, and the like. Has been. The display unit 3 outputs and displays the input parameters input from the input unit 2 and the calculation results of the storage battery deterioration tendency estimation program 6, and is composed of an LCD or the like.

  The discharge characteristic database 4 is a database that stores initial discharge characteristics at a specific discharge current value. Specifically, for each rated capacity of the storage battery, for example, an initial discharge curve (initial discharge characteristic) of a 10-hour discharge rate (0.1 C discharge current value when “C” is a rated capacity), a 5-hour discharge rate An initial discharge curve of (0.16C discharge current value), an initial discharge curve of 3 hours discharge rate (0.23C discharge current value), and the like are stored. Furthermore, an initial discharge curve for each storage battery having a different manufacturing design is stored. That is, since the manufacturing process and the design concept affect the discharge characteristics of the storage battery, an initial discharge curve is stored for each storage battery having a different manufacturing process and design concept, for example, for each manufacturer.

  The secular change database 5 is a database that stores the trend of the secular change of the discharge capacity at a certain discharge current value of the storage battery. Specifically, in this embodiment, for each rated capacity of the storage battery at an ambient temperature of 25 ° C., as shown in FIG. 2, the trend of the discharge capacity of the 10-hour discharge rate, which is the discharge time rate of the rated capacity, over time. And experimental curve L2 based on this experimental data L1 are stored. Further, similar to the discharge characteristic database 4, a tendency of aging for each storage battery having a different manufacturing design is stored. That is, since the manufacturing process and the design concept influence the secular change of the storage battery capacity and the like, the tendency of the secular change is stored for each storage battery having a different manufacturing process and design concept, for example, for each manufacturer.

The storage battery deterioration tendency estimation program 6 is a program that calculates the post-aging discharge characteristics of the actual discharge current of the target storage battery based on the input parameters input by the input unit 2. That is, based on the discharge current value when the storage battery is actually discharged, the actual discharge time and the actual discharge voltage of at least one point (one set) measured at that time, the post-age discharge characteristics at the time of discharge, etc. To the computer,
Based on the initial discharge characteristics stored in the discharge characteristic database 4, an initial characteristic step for calculating an initial discharge characteristic for the actual discharge current value input at the input unit 2 as an initial discharge characteristic of the actual discharge current;
When the actual discharge voltage input at the input unit 2 is equal to or lower than a predetermined voltage, the actual discharge current value is calculated based on the actual discharge time, the actual discharge voltage, and the initial discharge characteristics of the actual discharge current input at the input unit 2. A first post-age characteristic step for calculating the post-age discharge characteristic for the actual discharge current as the post-age discharge characteristic of the actual discharge current;
When the actual discharge voltage input at the input unit 2 is higher than a predetermined voltage, the discharge capacity for the aging value input at the input unit 2 is acquired from the aging database 5 and the acquired discharge capacity and actual discharge current are acquired. A second post-age characteristic step of calculating the post-age discharge characteristic of the actual discharge current based on the value and the initial discharge characteristic of the actual discharge current;
A life step for calculating the life until reaching a predetermined capacity based on the discharge characteristics after the lapse of the calculated actual discharge current,
Is a program for executing

  Here, examples of the actual discharge include a case where power is supplied (discharged) from the storage battery to a load to be backed up, a case where power is supplied from the storage battery to the test equipment, and the like. Therefore, for example, when discharging is performed on a load to be backed up, a discharge current value to the load becomes an actual discharge current value. The actual discharge may be performed on a single battery (single battery / cell) or may be performed on an assembled battery configured by connecting a plurality of single batteries. That is, the discharge characteristic database 4 and the aging database 5 store initial discharge characteristics and aging trends as single cells, but when actual discharge is performed on the assembled battery, the entire assembled battery The voltage (average cell voltage) obtained by dividing the voltage (total voltage) by the number of cells connected in series (number of cells) is defined as the actual discharge voltage.

  Specifically, as shown in FIG. 3, first, an initial discharge characteristic with respect to an actual discharge current value input at the input unit 2 is calculated as an initial discharge curve (initial discharge characteristic) of the actual discharge current (step S1, initial stage). Characteristic step). For example, the actual discharge current value is 0.12 C (= rated capacity C × 0.12), the initial discharge curve of 10 hour discharge rate (0.1 C) and the five hour discharge rate (0.16 C) are stored in the discharge characteristic database 4. As shown in FIG. 4, the initial discharge curve of 0.12C is apportioned between the initial discharge curve of 0.1C and the initial discharge curve of 0.16C. D1 is calculated. Here, an initial discharge curve such as 0.1 C corresponding to the rated capacity of the storage battery and the manufacturer (manufacturing design) input from the input unit 2 is acquired from the discharge characteristic database 4, and an initial discharge curve D 1 of 0.12 C is obtained. Is calculated.

  Next, it is determined whether or not the actual discharge voltage input at the input unit 2 is equal to or lower than a predetermined voltage (step S2). That is, it is determined whether or not the actual discharge voltage is measured to a predetermined voltage or less during actual discharge. The reason for making such a determination is that when the actual discharge voltage is measured to a predetermined voltage or less, it is considered that highly reliable measurement data is obtained for an aged storage battery. . This is because the discharge characteristics of the storage battery change with age, for example, the voltage drop immediately after discharge increases with age, and it is appropriate only with the measurement data at high voltage (at the time of voltage drop at the beginning of discharge). This is due to the inventor's consideration that the discharge characteristics (discharge curve) cannot be estimated. For this reason, the predetermined voltage is set to a voltage capable of estimating an appropriate discharge curve, for example, a voltage close to a discharge end voltage (voltage at which discharge should be terminated for each discharge current value).

  When the actual discharge voltage is equal to or lower than the predetermined voltage, the post-age discharge with respect to the actual discharge current value is performed based on the actual discharge time, the actual discharge voltage, and the initial discharge curve of the actual discharge current input at the input unit 2 A curve (discharge characteristics after aging) is calculated as an aging discharge curve of the actual discharge current (step S3, first aging characteristics step). Specifically, as shown in FIGS. 5 and 6, the initial discharge curve D1 of the actual discharge current calculated in step S1 is apportioned and deformed so as to pass through the point P1 between the actual discharge time and the actual discharge voltage. A discharge curve D2 after the lapse of the actual discharge current is calculated.

On the other hand, when the actual discharge voltage is higher than the predetermined voltage, first, the discharge capacity for the aging value input by the input unit 2 is acquired from the aging database 5 (step S4). That is, the discharge capacity corresponding to the elapsed years from the date of manufacture of the storage battery is acquired. At this time, the approximate capacity L2 (FIG. 2) of the secular change corresponding to the rated capacity of the storage battery inputted by the input unit 2 and the manufacturer (manufacturing design) is searched from the secular change database 5 to obtain the discharge capacity. Further, when the average ambient temperature input by the input unit 2 is higher than 25 ° C., the discharge capacity is acquired as the aging value converted to 25 ° C. by the aging value input by the input unit 2. That is, when the average ambient temperature is higher than 25 ° C. according to Arrhenius' law, the deterioration of the storage battery is accelerated as shown in the following equation, so that the aged value is converted to 25 ° C.
F ₂₅ = F × 2 ^ {(T−25) / 10}
F: Actual elapsed time F ₂₅ : Elapsed time converted to 25 ° C T: Average ambient temperature

Next, based on the acquired discharge capacity, the discharge capacity at the actual discharge current value with respect to the aging value is calculated (step S5). That is, based on the aging discharge current value and the actual discharge current value stored in the aging database 5, the discharge capacity at the actual discharge current value corresponding to the elapsed years is calculated. Specifically, for example, as shown in the following equation, the ratio between the initial capacity CP1 in the discharge current value of the aging database 5 and the initial capacity CP2 in the actual discharge current value, and the discharge capacity CP3 with respect to the aging value in the aging database 5 Based on the above, the discharge capacity CP4 with respect to the aging value at the actual discharge current value is calculated.
CP4 = CP2 / CP1 × CP3

  Subsequently, based on the discharge capacity CP4 calculated in step S5 and the initial discharge curve of the actual discharge current, a post-age discharge curve (post-age discharge characteristics) of the actual discharge current is calculated (step S6). That is, as shown in FIGS. 7 and 8, the initial discharge curve D1 of the actual discharge current is apportioned and deformed so that the discharge capacity becomes the discharge capacity CP4 calculated in step S5, and the post-aging discharge curve of the actual discharge current is obtained. D2 is calculated. 7 corresponds to the post-age discharge curve D2, and “corrected capacity” corresponds to the discharge capacity CP4.

  In this embodiment, the post-aging discharge curve D3 of the actual discharge current based on the actual discharge time, the actual discharge voltage (P1), and the initial discharge curve D1 of the actual discharge current is also calculated for comparison and the like. In FIG. 7, “discharge time (measurement time)” corresponds to the post-aging discharge curve D3, and “capacity” corresponds to the discharge capacity based on the actual discharge time and the actual discharge voltage (P1). The above steps S4 to S6 correspond to the second post-age characteristic step.

  Next, the actual capacity at the discharge time rate (rated time rate) of the rated capacity is calculated based on the calculated aged discharge curve D2 of the actual discharge current (step S7). That is, the discharge capacity at the actual discharge current value is calculated from the discharge curve D2 after aging, and this discharge capacity is converted into the actual capacity at the rated time rate. At this time, for example, the actual capacity is converted based on the ratio between the initial capacity at the rated time rate and the initial capacity at the actual discharge current value. For example, when the actual discharge current value is 0.16 C, the discharge capacity is 65.7%, and the rated time rate is 0.1 C, the actual capacity at the rated time rate is calculated as 70.3%.

  Subsequently, based on the actual capacity calculated in step S7, a lifetime until reaching a predetermined capacity is calculated (step S8). That is, as shown in FIG. 9, the actual capacity is plotted on a graph showing the relationship between the elapsed years and the capacity, and the initial capacity and the actual capacity (a plurality of actual capacities when there are plural) are connected by a line. Let L3. At this time, as in step S4, when the average ambient temperature input at the input unit 2 is higher than 25 ° C., the aging value input at the input unit 2 is set to 25 ° C. based on Arrhenius' law. The actual capacity is plotted as the aged value (elapsed years) converted to. Based on this capacity transition line L3, the estimated life and remaining life until reaching the predetermined capacity are calculated. Here, in this embodiment, a capacity that is regarded as the life of the storage battery (for example, 70%) and a capacity that requires a renewal plan for the storage battery (for example, 80%) are set as predetermined capacities until the two capacities are reached. The estimated life and remaining life of are calculated. The above steps S7 and S8 correspond to the above life step. The estimated life indicates the estimated period from the manufacturing date to the end of life, and the remaining life indicates the estimated period from the current time (at the time of actual discharge) to the end of the life.

  Next, the operation and operation of the storage battery deterioration tendency estimation system 1 having such a configuration will be described. First, after the battery is actually discharged, information at the time of the actual discharge is input as input parameters at the input unit 2. Specifically, as shown in FIG. 10, a storage battery manufacturer / model, the number of storage batteries, a load current (actual discharge current value), an ambient temperature, a manufacturing date, a discharge measurement date, and the like are input. At this time, the storage battery capacity (rated capacity), the discharge rate, and the elapsed year are calculated based on the input parameters. Further, the actual discharge time and the actual discharge voltage measured when the storage battery is actually discharged are input.

  Next, when the storage battery deterioration tendency estimation program 6 is started, the initial discharge curve D1 of the actual discharge current and the aged discharge curve D2 of the actual discharge current are calculated as described above, as shown in FIGS. Discharge curves D1 and D2 are displayed on the display unit 3. Further, the capacity transition line L3 indicating the estimated transition of capacity is calculated and displayed on the display unit 3 together with the experimental data L1 indicating the tendency of secular change as shown in FIG. Thus, since the capacity transition line L3 based on the actual discharge is displayed together with the experimental data L1, it is possible to easily and quickly grasp whether or not the deterioration tendency of the storage battery is appropriate.

  Furthermore, in the storage battery deterioration tendency estimation program 6, as described above, the estimated life and remaining life until reaching a predetermined capacity are calculated and displayed on the display unit 3. That is, for example, the estimated lifetime reaching 80% of the rated capacity is calculated and displayed as 10 years, the estimated lifetime reaching 70% of the rated capacity is calculated as 11.2 years, and the like. At the same time as the estimated life, an appropriate expected life is displayed on the display unit 3. Here, the appropriate expected life is a life in consideration of an average ambient temperature with respect to an expected design life in the target storage battery. Specifically, for example, as shown in FIG. 11, the expected design life when the average ambient temperature is 25 ° C. or less is 15 years. At this time, when the average ambient temperature is higher than 25 ° C., the life is shortened according to Arrhenius' law, for example, when the average ambient temperature is 28 ° C., it is about 12.2 years. Thus, since the estimated life and remaining life based on actual discharge and the appropriate expected life are displayed on the display unit 3, it is possible to properly and easily grasp the deterioration tendency of the storage battery and the presence or absence of abnormality of the storage battery. it can.

  As described above, according to the storage battery deterioration tendency estimation system 1, when the actual discharge voltage measured when the storage battery is actually discharged is equal to or lower than a predetermined voltage, that is, a highly reliable measurement for an aged storage battery. When the data is obtained, the post-aging discharge curve D2 of the actual discharge current is calculated based on the measurement data (actual discharge time and actual discharge voltage). For this reason, an appropriate post-age discharge curve D2 based on highly reliable measurement data is obtained. On the other hand, when the actual discharge voltage measured when the storage battery is actually discharged is higher than a predetermined voltage, that is, when reliable measurement data is not obtained for an aged storage battery, Based on the discharge capacity corresponding to the value, the initial discharge curve D1, and the like, a post-aging discharge curve D2 of the actual discharge current is calculated. For this reason, a proper post-age discharge curve D2 based on the aging value of the storage battery is obtained. In this way, it is possible to more appropriately estimate the deterioration tendency of the storage battery by obtaining the post-aging discharge curve D2 of the appropriate actual discharge current. And even if it is a case where it is not made to actually discharge to a low voltage, it becomes possible to estimate the deterioration tendency of a storage battery more appropriately.

  Further, the post-aging discharge curve D2 of the actual discharge current is calculated based on the initial discharge curve corresponding to the storage battery manufacturer (manufacturing design) and the tendency of aging. In other words, since the post-age discharge curve D2 is calculated based on the manufacturing design that affects the discharge characteristics and life characteristics of the storage battery, a more appropriate post-age discharge curve D2 can be obtained. As a result, it becomes possible to estimate the deterioration tendency of the storage battery more appropriately. In addition, since the estimated life and remaining life until reaching the predetermined capacity are calculated, it is possible to estimate the deterioration tendency of the storage battery more appropriately and to take measures against the storage battery appropriately and quickly. Become. Furthermore, since the discharge curve D2 after the actual discharge current is displayed, it is possible to easily determine what kind of discharge trajectory leads to the final voltage, how much remaining discharge is possible, and the like. Become. In addition, when actual discharge is performed on the load, a discharge curve D2 after the actual discharge current for the load is displayed, so that the discharge characteristics at the present time (at the time of actual discharge) with respect to the actual load Can be grasped appropriately.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the input unit 2 is used as an input unit, and input parameters are input through the input unit 2. However, a measurement device that measures voltage, discharge time, etc. during actual discharge is used as an input unit, and the measurement device The measurement data measured in step 1 may be directly input as an input parameter. Moreover, although the discharge curve is used as the discharge characteristic, only the discharge capacity value may be used as the discharge characteristic. That is, only the discharge capacity value may be calculated without calculating the discharge curve as the initial discharge characteristics or the post-age discharge characteristics. Furthermore, it goes without saying that the present invention can be applied not only to sealed lead-acid batteries, but also to other storage batteries such as lithium ion secondary batteries.

1 Storage battery deterioration tendency estimation system 2 Input unit (input means)
3 Display unit 4 Discharge characteristic database (discharge characteristic storage means)
5 Aging database (aging storage means)
6 Storage battery deterioration tendency estimation program (processing means)
7 Central processing unit

Claims (4)

The discharge characteristics of the storage battery in an unaged state are the initial discharge characteristics, the discharge characteristics of the storage battery after the aging are the discharge characteristics after the aging,
An input means for inputting the aging value of the storage battery, the actual discharge current value when the storage battery is actually discharged, the measured actual discharge time, the actual discharge voltage, and the like,
Discharge characteristic storage means for storing initial discharge characteristics at a specific discharge current value;
A secular change storage means for storing a trend of the secular change of the discharge capacity at a discharge current value of the storage battery,
Based on the initial discharge characteristic stored in the discharge characteristic storage means, the initial discharge characteristic with respect to the actual discharge current value input by the input means is calculated as the initial discharge characteristic of the actual discharge current, and input by the input means When the actual discharge voltage is equal to or lower than a predetermined voltage, the post-age discharge with respect to the actual discharge current value is performed based on the actual discharge time, the actual discharge voltage, and the initial discharge characteristics of the actual discharge current input by the input unit. When the actual discharge voltage is higher than the predetermined voltage, the discharge capacity corresponding to the aging value input by the input unit is obtained from the aging storage unit. And a processing means for calculating a post-age discharge characteristic of the actual discharge current based on the obtained discharge capacity, the actual discharge current value, and the initial discharge characteristic of the actual discharge current;
A storage battery deterioration tendency estimation system comprising:   2. The storage battery deterioration tendency estimation system according to claim 1, wherein the processing unit calculates a life until a predetermined capacity is reached based on a discharge characteristic after aging of the actual discharge current. The discharge characteristic storage means stores the initial discharge characteristics for each storage battery having a different manufacturing design, and the secular change storage means stores the aging tendency for each storage battery having a different manufacturing design,
The processing means calculates an after-age discharge characteristic of the actual discharge current based on an initial discharge characteristic corresponding to the manufacturing design of the storage battery input by the input means and a tendency of aging. The storage battery deterioration tendency estimation system according to any one of claims 1 and 2. The discharge characteristics of the storage battery in an unaged state are the initial discharge characteristics, the discharge characteristics of the storage battery after the aging are the post-discharge characteristics, and the aging value of the storage battery and the actual discharge current value when the storage battery is actually discharged are measured. The actual discharge time and the actual discharge voltage are input,
On the computer,
Based on the initial discharge characteristics at a specific discharge current value, calculating the initial discharge characteristics for the input actual discharge current value as the initial discharge characteristics of the actual discharge current;
When the input actual discharge voltage is equal to or lower than a predetermined voltage, the post-age discharge characteristics with respect to the actual discharge current value are calculated based on the input actual discharge time, the actual discharge voltage, and the initial discharge characteristics of the actual discharge current. A step of calculating the discharge characteristics after the aging of the actual discharge current;
When the actual discharge voltage is higher than the predetermined voltage, based on the tendency of the discharge capacity to change over time at a discharge current value of the storage battery, obtain the discharge capacity for the input aging value, and the acquired discharge capacity and Based on the actual discharge current value and the initial discharge characteristics of the actual discharge current, calculating post-age discharge characteristics of the actual discharge current;
Storage battery deterioration tendency estimation program for executing

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