JP6054788B2 - Storage battery residual quantity estimation device and residual quantity estimation method - Google Patents

Description

  The present invention relates to a storage battery remaining amount estimation device and a remaining amount estimation method, and more particularly to estimation processing.

  In recent years, with ubiquitous, cloud services that can access necessary information regardless of location are increasing. In order to receive necessary services even when they are away from home, small and easy-to-carry information terminals such as mobile PCs (personal computers), netbooks, smartphones, and tablet terminals have become widespread.

  These portable electrical appliances include rechargeable secondary storage batteries that can store and discharge using chemical reactions, including nickel-hydrogen (Ni-H) and lithium-ion (Li-ion). Built-in or attached. Therefore, even if it is not connected to a system power source such as an outlet, it can be used while being moved by power supply from the storage battery.

  Storage batteries have a limit on the amount of charge that can be stored depending on the size and nature of the battery itself, so if the charge in the battery is discharged while using the portable device, the power required by the portable device can be supplied. Disappear. Therefore, it is necessary to charge by connecting to an external power source periodically.

  In order to improve the usability of products that operate using these storage batteries, it is very important to know how long the device can operate, so the majority of products that use these storage batteries. Has a function of calculating and displaying the remaining battery level.

  However, the characteristics of the storage battery are very complex, and it is not easy to estimate the remaining amount of storage, and a fairly expensive and sophisticated detection device is required depending on the estimation accuracy. Therefore, various estimation methods have been devised depending on the required performance.

  There are two main methods for estimating the stored charge in the storage battery. One is a method of tabulating the open circuit voltage (OCV) of the battery, and the other is a coulomb counter method that monitors the charge flow into and out of the battery as needed to estimate the internal charge. is there.

  The method using the OCV table is based on the characteristic that the voltage value (OCV) that appears at the battery terminal when no load is connected to the battery is proportional to the amount of charge stored in the battery. This is a method of calculating the voltage from the calculation and estimating the state of charge (SoC) therefrom. In this method, the SoC value is uniquely determined only by detecting the terminal voltage of the storage battery. However, when actually detecting the SoC, it is extremely rare that the load device receiving the power from the battery is unloaded. Therefore, it is necessary to estimate the OCV in consideration of the internal impedance of the battery itself and the load amount of the load device. In addition, since the load amount of the load device is not constant, in order to calculate a highly accurate SoC, there is a problem that a current detection device is also required to acquire the load on the battery. .

  In addition, the relationship between OCV and SoC is nonlinear in the case of many batteries, and a small change in OCV can change the SoC significantly. To maintain the linearity of the SoC, a highly accurate voltage / current detector Then, a filter for removing noise is required.

  On the other hand, the method using the coulomb counter detects the voltage of the storage battery and the outflow / inflow current and calculates the amount of charge that increases or decreases in the storage battery using Ohm's law, thereby increasing or decreasing the SoC value of the storage battery. How to monitor. Since this method constantly monitors the charge that actually enters and exits the battery, it is possible to calculate the increase / decrease in SoC with high accuracy, but since the calculation formula is relative in time, the absolute SoC value Cannot be calculated. Therefore, in the Coulomb counter method, before calculating the SoC, the initial value is the state of charge of the storage battery to be measured, and how much charge will flow into the storage battery before the storage battery is fully charged An initialization operation that measures information in advance is required.

  Also, if a load fluctuation occurs at a time earlier than the monitoring cycle on the load device side, the amount of charge movement at that time cannot be detected, so the calculated SoC value is slightly offset from the actual SoC value. Will occur. In order to correct this offset, the coulomb counter method has a problem that it needs to be initialized periodically.

  In Patent Document 1, the charge / discharge current detection value is integrated to calculate the remaining capacity of the battery, the remaining capacity of the battery is estimated based on the open terminal voltage of the battery, and the difference between the calculated remaining capacity value and the estimated remaining capacity value is calculated. It has been proposed to correct the calculation method of the remaining capacity calculation value based on the change rate of the battery, and thereby obtain the remaining capacity of the battery.

Japanese Patent Laid-Open No. 11-223665

  In Patent Document 1, the charge / discharge current is sampled at a predetermined time interval to obtain a current-time product, and this is added to the previous remaining capacity calculation value to calculate the remaining capacity. It is strongly influenced by the sampling time interval of charge / discharge current. In order to calculate the remaining capacity with high accuracy, the sampling time interval must be shortened, and the number of calculation processes increases.

  An object of the present invention is to provide a storage battery remaining amount estimation device and a remaining amount estimation method that solves the problem of increasing the number of processing operations in order to calculate the storage amount with high accuracy, which is the problem described above. And

  In order to achieve the object, a storage battery remaining amount estimation device according to the present invention includes a current detector that detects a current value flowing through a storage battery, a voltage detector that detects a voltage value at an output terminal of the storage battery, and the storage battery. The storage amount value is estimated from the relationship between the storage amount of the battery and the open-circuit voltage of the storage battery, the current value, and the voltage value, the storage amount change amount that is the change amount of the storage amount is calculated, and the calculated And a storage battery remaining amount estimation unit that increases or decreases the stored amount value based on the stored amount change amount.

The method for estimating the remaining amount of a storage battery according to the present invention calculates an open circuit voltage from a current value flowing through the storage battery and a voltage value at an output terminal of the storage battery, and stores a storage amount value from a relationship between the storage amount of the storage battery and the open circuit voltage. Estimate
A storage amount change amount is calculated from the current value and the voltage value, and the storage amount value is increased or decreased based on the storage amount change amount.

  According to the storage battery remaining amount estimation device of the present invention, it is possible to estimate the remaining amount of the storage battery with high accuracy without increasing the number of arithmetic processes.

It is a block diagram which shows the structure of the residual amount estimation apparatus of the storage battery which concerns on one Embodiment of this invention. It is a graph which shows the relationship between SoC and a terminal open circuit voltage. It is an internal structure equivalent circuit diagram of a storage battery. It is a flowchart which shows the residual amount estimation method of the storage battery which concerns on one Embodiment of this invention. It is a flowchart for demonstrating the detail of the SoC value estimation process which concerns on one Embodiment of this invention. It is a flowchart for demonstrating the detail of the electrical storage amount increase / decrease process which concerns on one Embodiment of this invention. It is a table | surface which shows an example of the table which the memory | storage device 107 records. It is a block diagram which shows the structure of the modification of the residual amount estimation apparatus of a storage battery based on one Embodiment of this invention.

  Preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a storage battery remaining amount estimation device according to an embodiment of the present invention. FIG. 2 is a graph showing the relationship between the SoC and the terminal open circuit voltage. FIG. 3 is a structural diagram schematically simulating the internal structure of the storage battery. FIG. 4 is a flowchart showing the overall operation of the storage battery remaining capacity estimation method according to the embodiment of the present invention. FIG. 5 is a flowchart for explaining details of the SoC value estimation processing according to the embodiment of the present invention. FIG. 6 is a flowchart for explaining details of the storage amount increasing / decreasing process according to the embodiment of the present invention. FIG. 7 is a table showing an example of a table recorded by the storage device 107.

  In order to solve the above-mentioned problem, the present invention is a storage battery remaining amount estimation device provided with an arithmetic processing device capable of monitoring the terminal voltage of a secondary storage battery and the amount of current flowing in and out of the secondary storage battery, and stores the power using an OCV table The coulomb counter is used in a complementary manner with the quantity estimation method as a main component. This improves the linearity of the calculated SoC value, which is a weak point of the OCV table method, and makes it possible to estimate the remaining battery level with higher accuracy.

  The storage battery remaining amount estimation device according to this embodiment includes a voltage detection device that detects the voltage of the secondary storage battery, a current detection device that detects current flowing into and out of the secondary storage battery, and the detected voltage value and current. And an arithmetic processing unit that calculates using values. With such a configuration, the amount of charge stored in the secondary storage battery can be estimated and output.

  A storage battery remaining amount estimation device 1 according to an embodiment of the present invention is used by being connected to a secondary storage battery 101 as shown in FIG. Here, the secondary storage battery 101 can convert electric energy supplied from the outside into chemical energy and store it as a charge, and discharge the stored charge to the outside to supply power to other load devices 102. Can be supplied.

  That is, the storage battery remaining amount estimation device 1 has a voltage detector 103 that detects a voltage appearing at an input / output terminal of the secondary storage battery 101 and a current that is exchanged between the secondary storage battery 101 and the load device. It has a current detector 104 that detects the direction and amount, and a storage battery remaining amount estimation unit 100. It is good also as providing the indicator 108 which tells the apparatus user the battery storage amount which the storage battery residual amount estimation part 100 calculated.

  The storage battery remaining amount estimation unit 100 includes an arithmetic processing unit 105 that performs calculation / calculation for estimating the amount of power stored in the secondary storage battery from the acquired voltage value and current value, and the arithmetic processing unit 105 calculates the amount of power stored in the battery. And a recording device 107 that records prior information necessary for estimation. Further, an A / D converter 106 that receives the voltage value and current value of the analog information output from the voltage detector 103 and the current detector 104, converts the analog information into digital information so that the arithmetic processing unit 105 can handle it, and outputs the digital information. It is good also as a structure provided.

  As shown in the graph of FIG. 2, the secondary storage battery 101 has a terminal open voltage indicating a voltage value of an output terminal in a state where a load such as the load device 102 is not connected to the battery according to the SoC existing inside the battery. (OCV) has changing characteristics.

  The storage device 107 is previously provided with a relationship table as shown in FIG. 7A in which the relationship between the OCV of the connected secondary storage batteries and the storage amount is pointed out. Further, as shown in FIG. 7B, a maximum storage capacity value that represents the storage amount when the storage amount of the secondary storage battery is 100% in units of the amount of power is stored. As shown in FIG. 7C, a value of the internal impedance is recorded when the internal impedance is simply imitated when the secondary storage battery is represented by an equivalent circuit model. These relationship tables, maximum storage capacity values, and internal impedance values are examples.

  The relationship table in FIG. 7A is created by extracting a plurality of points from the graph showing the relationship between the SoC and the terminal open voltage in FIG. FIG. 7A shows a relationship table when 16 points are extracted. More specifically, each numerical value in the relational table in FIG. 7A indicates a case where the 16 points (points marked with X) in FIG. 2 are extracted. As for the position of the point, it is desirable to select a point having a small error when linearly interpolating between each point based on the characteristics of the secondary storage battery 101 identified in advance.

  In the embodiment of the present invention, as shown in FIG. 3, the internal structure of the secondary storage battery includes a terminal open voltage 302 determined by the amount of charge stored inside when the negative electrode 301 is installed, and the terminal open voltage is the secondary storage battery. It is assumed that it is constituted by an internal impedance 305 that exists until it is output to the output terminal 304 connected to the positive electrode 303. Then, the electrical value of the internal impedance 305 as shown in FIG.

  Next, the operation of the storage battery remaining amount estimation device and the remaining amount estimation method according to the present embodiment will be described with reference to FIG. First, in order to start the estimation process, it is necessary to know how much power is stored in the storage battery 101 connected to the apparatus.

  Therefore, SoC value estimation processing is performed. This SoC value estimation process uses the internal impedance value of the secondary storage battery 101 shown in FIG. 7C and the OCV table shown in FIG. The OCV table is compared with the current voltage value and current value to calculate the current SoC (step S401). When this SoC value estimation process is executed, the current SoC value SOC and the upper limit SoC point P_U and the lower limit SoC point P_D, which are SoC points selected from the OCV table for calculating the SOC, are determined.

  The upper limit SoC point P_U is an index of a table that reaches the next in the SoC value of the OCV table when the SOC moves in the increasing direction. The lower limit SoC point P_D is an index of a table that reaches the next in the SoC value of the OCV table when the SOC moves in a decreasing direction.

  After completion of the SoC value estimation process, after performing a monitoring cycle t standby process (step S402) based on a predetermined secondary battery remaining capacity monitoring cycle time t (step S402), the SOC value becomes the upper limit SoC point P_U and the lower limit SoC. It is determined whether there is an SoC value indicated by the index of the point P_D (step S403). If the SOC value does not exist between the SoC values indicated by the indexes of the upper limit SoC point P_U and the lower limit SoC point P_D, the process returns to the regression point 405 and the SoC value estimation process in step S401 is performed again.

  If the SOC value is present between the SoC values indicated by the indices of the upper limit SoC point P_U and the lower limit SoC point P_D in step S403, a storage amount increase / decrease process is performed (step S404). In this power storage amount increase / decrease process, the maximum power storage capacity recorded in the storage device 107 as shown in FIG. 7B is used to calculate the amount of power increased or decreased from the secondary storage battery from the measured voltage amount and current amount. The SoC increase / decrease processing is performed. When the storage amount increase / decrease process is completed, the process returns to the regression point 406, and whether the monitoring cycle t standby process (step S402) and the SOC value exist between the SoC values indicated by the indices of the upper limit SoC point P_U and the lower limit SoC point P_D. The determination (step S403) is repeated.

  The detailed processing content of the SoC value estimation processing (step S401 in FIG. 4) will be described with reference to the flowchart in FIG. First, the arithmetic processing unit 105 uses the connected A / D converter 106 and the terminal voltage V [V] of the secondary storage battery 101 at that time and the amount of current exchanged between the secondary storage battery 101 and the load device 202. I [A] is acquired (step S501). Next, the arithmetic processing unit 105 uses the internal impedance value recorded in the recording device 107 in addition to the acquired voltage value V and current value I, and when the output terminal of the secondary storage battery is unloaded. The terminal open circuit voltage OCV is calculated (step S502). The calculation formula of OCV at this time is performed in accordance with an electrical physical law, that is, OCV = V + R * I.

  Next, the arithmetic processing unit 105 uses the OCV table recorded in the recording unit 107 to determine the index of the OCV table between which the current OCV value exists, using the calculated OCV value ( Step S503). For the two indexes sandwiching the OCV, the larger OCV value is recorded as the upper limit SoC point P_U, and the smaller OCV value is recorded as the lower limit SoC point P_D.

  As an example, when the calculated terminal open circuit voltage OCV = 3.87 [V], the current OCV is a voltage between the index 9 and the index 10 as compared with the OCV table of FIG. I understand. In this case, the upper limit SoC point P_U is index 10, and the lower limit SoC point P_D is index 9.

  Next, the arithmetic processing unit 105 calculates a SoC value corresponding to the calculated OCV from the calculated OCV value and the OCV and SoC value values of the two indexes P_U and P_D using a linear algebraic method. The value SOC is recorded (step S504).

At this time, as shown in FIG. 7A, the voltage value information of the upper limit SoC point P_U is 3.900V, the SoC value information is 63%, the voltage value information of the lower limit SoC point P_D is 3.855V, and the SoC value Information is 57%. Using a first-order linear interpolation formula, which is a general mathematical method,
SoC = 63-(63-57) / (3.9-3.855) * (3.9-3.87) = 59% Thereby, the SoC value estimation process can estimate the SoC value from the OCV voltage at that time.

  The detailed processing contents of the storage amount increase / decrease processing (step S404 in FIG. 4) will be described with reference to the flowchart in FIG. First, the arithmetic processing unit 105 uses the connected A / D converter 106 and the terminal voltage V [V] of the secondary storage battery 101 at that time and the amount of current exchanged between the secondary storage battery 101 and the load device 102. I [A] is acquired (step S601). Next, in addition to the acquired voltage value V and current value I, the arithmetic processing unit 105 uses the monitoring cycle time t [seconds] of the secondary storage battery that is determined in advance as the specifications of the device, so that the previous monitoring time Therefore, the amount of power change ΔP is calculated to determine how much power has increased or decreased in the secondary storage battery 101 (step S602).

  For example, when the measured voltage value V = 3.91 V and the current value I = 0.3 A at the monitoring cycle time t = 2 [seconds], the power change ΔP flowing out from the secondary storage battery 101 in 2 seconds is the physical amount Based on the law, it is obtained as ΔP = (3.91 * 0.3) * (2/3600) = 0.65 [mWh].

  Based on the maximum storage capacity value P_ALL recorded in the recording device 107 in FIG. 7B, the arithmetic processing unit 105 causes the power change amount ΔP flowing out from the secondary storage battery 101 previously obtained to the secondary storage battery 101. Find out how much the change amount is. In this embodiment, since the maximum storage capacity is 8.0 Wh, ΔP = 0.65 mWh obtained previously corresponds to 0.65 / 8000 = 0.008125 [%] for the secondary storage battery 101. This SoC change amount is set to ΔSOC (step S603).

  The arithmetic processing unit 105 adds the previously calculated SoC change amount ΔSOC to the SoC value SOC obtained in the previous storage amount increase / decrease process (step S402) or SoC value estimation process (step S401), and calculates the calculated SoC. It is recorded as a value SOC (step S604).

  As an example, when the previous calculation result SOC is 59% and the change amount ΔSOC is 0.008125%, it is updated as SOC = 58.991875%.

  In this way, the storage amount increasing / decreasing process increases / decreases the SoC value from the terminal voltage of the secondary storage battery at that time and the current value that enters and exits. Thus, the remaining amount of the secondary storage battery is estimated. The power storage amount increase / decrease process is periodically repeated based on the monitoring cycle time t. The display 108 displays the amount of battery storage obtained by the calculation by the storage battery remaining amount estimation unit 100 and notifies the device user.

  As described above, according to the present embodiment of the present invention, in the storage battery remaining amount estimation apparatus having the arithmetic processing unit 105 that can monitor the terminal voltage of the secondary storage battery 101 and the amount of current flowing in and out of the secondary storage battery 101, the OCV table Coulomb counters are used in a complementary manner, mainly using the method for estimating the amount of stored electricity. As a result, the linearity of the calculated SoC value, which is a weak point of the OCV table method, can be improved, and the remaining battery level can be estimated with higher accuracy. The remaining amount of the storage battery can be estimated with high accuracy without increasing the number of arithmetic processes.

  Further, the effects obtained by using the storage battery remaining amount estimating method and remaining amount estimating apparatus according to the embodiment of the present invention include the following.

  First, since the offset generated when the coulomb counter is used is corrected by the OCV table within a short time, a periodic initialization processing operation is unnecessary.

  Second, in the estimation method using the OCV table, the calculated SoC value may fluctuate up and down greatly due to the influence of noise components mixed in the detected voltage value and current value. On the other hand, according to the embodiment of the present invention, since the increase / decrease in the SoC is calculated by the increase / decrease addition of the charge fluctuation, a sudden change does not occur. This can be expected to improve the linearity of the SoC value.

  Third, since the method using the coulomb counter requires initialization processing to start SoC monitoring, the SoC calculation processing cannot be stopped while a load is connected to the secondary storage battery. On the other hand, in the embodiment of the present invention, the initialization operation is unnecessary, and the estimation processing operation can be stopped and restarted whenever necessary.

  The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the invention described in the claims, and it goes without saying that these are also included in the scope of the present invention. Nor.

  For example, although the current detector 104 is arranged on the positive electrode side of the secondary storage battery 101 in FIG. 1, the present invention does not limit the position of the current detector. Since it is only necessary to monitor the current input / output from the secondary storage battery 101, for example, the current detector 101 may be provided on the negative electrode side of the secondary storage battery 101 as shown in the modification of FIG.

  In FIG. 1, the display unit 108 is described to receive an output from the arithmetic processing unit 105, but control of the display unit is not limited to the arithmetic processing unit 105 according to the present invention. Therefore, if the load device 102 can exchange information with the arithmetic processing device 105 based on some method, the display device 108 may be connected to the load device to display the calculation result.

  In the above-described embodiment, the OCV table recorded in the recording device 107 has been described as having 16 points of the relationship between the battery capacity value and the OCV. However, the present invention limits the number of indexes in the OCV table. It is not a thing. The number of indexes on the table can be freely changed. As described above, the relationship between the OCV and the SoC is non-linear in many batteries, and a small change in the OCV will significantly change the SoC. In order to cope with such non-linear characteristics, as described above, the position of the points is reduced in error when linear interpolation is performed between the points based on the characteristics of the secondary storage battery 101 identified in advance. Just choose.

  Moreover, in embodiment mentioned above, although the internal model of secondary storage battery 101 itself was made into the form as shown in FIG. 3, in this invention, the internal model of a secondary storage battery is not limited. Therefore, you may use the model corresponding to the secondary storage battery to be used freely.

A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.
(Supplementary note 1) A step of estimating a storage amount value from a current value and a voltage value of a storage battery and a storage amount table recorded in advance, and the estimated storage amount value is increased or decreased based on the calculated storage amount change amount A method for estimating the remaining amount of the storage battery.
(Supplementary note 2) The storage battery remaining capacity estimation method according to supplementary note 1, wherein the storage amount change amount is calculated from a maximum storage capacity value of the storage battery and a power change amount.
(Supplementary note 3) The storage battery remaining capacity estimation method according to supplementary note 2, wherein the power change amount is calculated from the voltage value and the current value of the storage battery and a monitoring cycle.
(Additional remark 4) The said electrical storage amount table has the some index which recorded the voltage value and electrical storage amount value which appear in the battery terminal in the state which does not connect the load to the said storage battery by a pair, The additional statement 1 thru | or the additional statement 3 The remaining capacity estimation method of the storage battery as described in any one.
(Appendix 5) A current detector for detecting the current value of the storage battery, a voltage detector for detecting the voltage value of the storage battery,
A power storage amount value is estimated from the stored power storage amount table and the detected current value and voltage value of the storage battery, a power storage amount change amount is calculated, and the calculated power storage amount change amount is calculated. A remaining battery remaining amount estimating device comprising: a remaining battery amount estimating unit configured to increase or decrease the estimated stored electricity amount value.
(Supplementary note 6) The storage battery remaining capacity estimation device according to supplementary note 5, wherein the voltage detector is connected between the storage battery and a load device that receives power supply from the storage battery.
(Additional remark 7) The said electric current detector is a residual amount estimation apparatus of the storage battery of Additional remark 6 arrange | positioned at the positive electrode side of the said storage battery.
(Additional remark 8) The said electric current detector is a residual amount estimation apparatus of the storage battery of Additional remark 6 arrange | positioned at the negative electrode side of the said storage battery.
(Additional remark 9) The said electrical storage amount table has the some index which recorded the voltage value and electrical storage amount value which appear in the battery terminal in the state which does not connect the load to the said storage battery by a pair, The additional notes 5 thru | or appendix 8 The storage battery residual quantity estimation apparatus as described in any one.
(Supplementary Note 10) A storage amount value estimation means for estimating a storage amount value from a current value and a voltage value of a storage battery and a stored power storage amount table, and the estimated storage amount based on the calculated storage amount change amount An apparatus for estimating the remaining amount of a storage battery, comprising: a storage amount value increasing / decreasing means for increasing / decreasing a quantity value.
(Supplementary note 11) The storage battery remaining amount estimation device according to supplementary note 10, wherein the power storage amount change amount is calculated from a maximum power storage capacity value and a power change amount of the storage battery.
(Supplementary note 12) The storage battery remaining capacity estimation device according to supplementary note 11, wherein the power change amount is calculated from the voltage value and the current value of the storage battery and a monitoring cycle.
(Additional remark 13) The said electrical storage amount table has the some index which recorded the voltage value and electrical storage amount value which appear in the battery terminal in the state which does not connect the load to the said storage battery by a pair, The additional description 10 thru | or the additional statement 12 The storage battery residual quantity estimation apparatus as described in any one.
(Supplementary note 14) Based on the process of estimating the storage amount value from the current value and voltage value of the storage battery and the stored storage amount table in advance, and the calculated storage amount change amount, the estimated storage amount value is increased or decreased. And a process for executing the processing.
(Additional remark 15) The recording medium which recorded the program of Additional remark 14 in the format which an arithmetic processing unit can read.

DESCRIPTION OF SYMBOLS 1 Remaining amount estimation apparatus 100 Storage battery remaining amount estimation part 101 Secondary storage battery 102 Load apparatus 103 Voltage detector 104 Current detector 105 Arithmetic processor 106 A / D converter 107 Memory | storage device 108 Indicator

Claims (10)

The open-circuit voltage is calculated from the current value flowing through the storage battery and the voltage value at the output terminal of the storage battery, and the storage battery is stored with reference to a storage amount table having a plurality of indexes recorded by pairing the open-circuit voltage and the storage amount value. The amount of stored electricity is estimated from the relationship between the amount and the open circuit voltage,
Waiting for a certain period of time after estimating the storage amount value, and when the storage amount moves in the increasing direction, the storage amount value indicated by the next reaching index in the storage amount value of the storage amount table and the storage amount decrease It is determined whether or not the estimated storage amount value exists between the storage amount values indicated by the next reached index in the storage amount value of the storage amount table when moving in the direction. Perform the estimation again,
A method for estimating a remaining amount of a storage battery that, when present , calculates an amount of change in storage amount from the current value and the voltage value and increases or decreases the amount of storage amount based on the amount of change in storage amount.   The storage battery remaining amount estimation method according to claim 1, wherein the storage amount change amount is calculated from a maximum storage capacity value of the storage battery and a power change amount.   The method according to claim 2, wherein the power change amount is calculated from the voltage value, the current value, and a monitoring cycle.   The next reached index of the storage amount values in the storage amount table when the storage amount moves in the increasing direction is the upper limit storage amount point, and the storage amount of the storage amount table when the storage amount moves in the decreasing direction The method for estimating a remaining capacity of a storage battery according to any one of claims 1 to 3, wherein an index that reaches next among values is a lower limit charged amount point. A current detector for detecting a current value flowing through the storage battery, a voltage detector for detecting a voltage value at an output terminal of the storage battery, a relationship between a storage amount of the storage battery and an open voltage of the storage battery, the current value and the voltage A storage amount estimation that estimates a storage amount value from the value, calculates a storage amount change amount that is a change amount of the storage amount, and increases or decreases the storage amount value based on the calculated storage amount change amount And
The storage battery remaining amount estimation unit estimates a storage amount value with reference to a storage amount table having a plurality of indexes recorded by pairing an open-circuit voltage and a storage amount value, and then estimates a storage amount value for a certain period of time. Only when the storage amount moves in the increasing direction, the storage amount value indicated by the next reached index in the storage amount value of the storage amount table, and the storage amount in the storage amount table when the storage amount moves in the decreasing direction. between the storage amount value indicated by the index to reach the next in the amount values, said determining whether the estimated storage amount value exists, have again the line the estimated when not in the meantime, when present during this time Is a storage battery remaining amount estimation device that calculates the amount of change in the amount of electricity stored and increases or decreases the amount of electricity stored based on the amount of change in the amount of electricity stored .   The said voltage detector is a remaining capacity estimation apparatus of the storage battery of Claim 5 connected between the load apparatus which receives electric power supply from the said storage battery and the said storage battery.   The remaining amount estimation device for a storage battery according to claim 6, wherein the current detector is disposed on a positive electrode side of the storage battery.   The storage battery remaining amount estimation device according to claim 6, wherein the current detector is disposed on a negative electrode side of the storage battery. Further comprising a recording device comprising the power storage amount table,
The next reached index of the storage amount values in the storage amount table when the storage amount moves in the increasing direction is the upper limit storage amount point, and the storage amount of the storage amount table when the storage amount moves in the decreasing direction The storage battery remaining amount estimation apparatus according to any one of claims 5 to 8, wherein an index that reaches next among the values is a lower limit charged amount point. Calculate the open circuit voltage from the current value flowing through the storage battery and the voltage value at the output terminal of the storage battery, and refer to the storage amount table having a plurality of indexes recorded by pairing the open circuit voltage and the storage amount value. A power storage amount value estimating means for
A storage amount value increasing / decreasing means for calculating a storage amount change amount from the current value and the voltage value, and increasing or decreasing the storage amount value based on the storage amount change amount;
The storage amount value estimation means waits for a certain period of time after estimating the storage amount value, and when the storage amount moves in an increasing direction, the storage amount indicated by the next reaching storage amount value in the storage amount table Determining whether the estimated storage amount value exists between the value and the storage amount value indicated by the next reached index among the storage amount values of the storage amount table when the storage amount moves in a decreasing direction; there again the line the estimated when not in the meantime, calculate the storage amount change amount when present during this period, the calculated on the basis of the storage amount change amount increases or decreases the storage amount value, battery Remaining amount estimation device.