JP2007263952A - Battery service life judging device and battery service life judging method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery service life judging device and a battery service life judging method, capable of accurately judging a service life of an accumulator. <P>SOLUTION: An expected service life value selection unit 7 references service life data stored in a service life data storage unit 5, and selects as an expected service life value, a service life corresponding a load power applied to the accumulator during discharge and an ambient temperature of the location where the accumulator 3 is installed. A first service life lowering amount calculation unit 12a calculates a first service life lowering amount according to a natural logarithm function having a variable of a value obtained by converting the number of discharge times of the accumulator 3 into time. A second service life lowering amount calculation unit 12b calculates a second service life lowering amount according to an average value of the accumulator temperature during discharge or halt mode measured at a predetermined time interval, the ambient temperature, and the time which has elapsed after the accumulator 3 is installed. A remaining service life calculation unit 12c calculates a remaining service life value by subtracting the first service life lowering amount and the second service life lowering amount from the expected service life amount. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a battery life determination device and a battery life determination method for determining the life of a storage battery used in an uninterruptible power supply device, and more specifically, based on the unique behavior of a nickel-hydrogen storage battery. The present invention relates to a battery life determination device and a battery life determination method for determination.

  In an apparatus having a built-in backup storage battery such as an uninterruptible power supply (UPS), it is important for maintenance inspection to detect the life of the storage battery. The deterioration of the life of nickel-metal hydride storage batteries is generally caused by corrosion of the hydrogen storage alloy of the negative electrode, but it is affected by factors such as operating temperature, number of discharges, elapsed time, and magnitude of load power during discharge. Often done. Thus, there are various factors for determining the life, and it is not easy to accurately determine the life of the storage battery in use.

  Conventionally, in order to determine the capacity and life of a nickel-hydrogen storage battery, it has been proposed to use an increase in internal resistance at the end of life or a voltage change during discharge as parameters for determining life. For example, the apparatus of Patent Document 1 performs deterioration determination by calculating the gradient based on the distribution of discharge voltage values corresponding to a plurality of discharge current values. Moreover, the apparatus of patent document 2 performs deterioration determination by comparing the internal resistance and battery voltage measured during discharge with the initial values. Such a life determination method focuses on the correlation between the internal resistance of the storage battery, the voltage change caused thereby, and the life of the storage battery, and is effective in that a certain life can be predicted in a short time. There is.

On the other hand, the expected life value is calculated from the discharge load power value, and the difference between this expected life value and the life reduction amount calculated as a linear function with the number of discharges as a variable is calculated as the remaining life value, and the life of the storage battery is determined. A method has been proposed (see, for example, Patent Document 3). Since this method can be utilized while properly correcting the expected life value with high accuracy without forcibly discharging the storage battery, it is effective for a lead storage battery or the like.
JP-A-8-138759 JP 2000-215923 A Japanese Patent Laid-Open No. 2000-243459

  However, in the methods of Patent Documents 1 and 2, the life cannot be determined unless the internal resistance increases to some extent, and the discharge frequency and the storage battery temperature that cause the life deterioration are not taken into consideration. Furthermore, in the method of Patent Document 3, because of the deterioration behavior unique to the nickel-hydrogen storage battery (corrosion of the hydrogen storage alloy of the negative electrode), the formula used for determining the life is not a linear function with the number of discharges as a variable. For this reason, in any case, there is a problem that the remaining life value greatly deviates from the actual value.

  The present invention has been made to solve the above problem, and an object of the present invention is to provide a battery life determination device and a battery life determination method capable of accurately determining the life of a storage battery.

  The battery life determination device according to the present invention includes a life data storage unit that stores life data indicating a relationship between a load power applied to a storage battery at the time of discharge and an environmental temperature of the place where the storage battery is installed, and the life of the storage battery. A load power measurement unit that measures load power applied to the storage battery, an environmental temperature measurement unit that measures the environmental temperature, and the life data stored in the life data storage unit, and the load An expected life value selection unit for selecting a life corresponding to the load power measured by the power measurement unit and the environmental temperature measured by the environmental temperature measurement unit as an expected life value, and a discharge frequency count for counting the number of discharges of the storage battery And reducing the expected life value based on a natural logarithm function using a value obtained by converting the number of discharges counted by the discharge number counting unit into time. A first life reduction amount calculation unit that calculates a first life reduction amount, an average value calculation unit that calculates an average value of the temperature of the storage battery during charging / discharging or at rest, and an elapsed time since the installation of the storage battery An elapsed time counting unit that counts, an average value of storage battery temperatures calculated by the average value calculating unit, an environmental temperature measured by the environmental temperature measuring unit, and an elapsed time counted by the elapsed time counting unit And a second life reduction amount calculating unit for calculating a second life reduction amount for reducing the expected life value, and the first life reduction amount from the expected life value selected by the expected life value selection unit. A remaining life value calculation unit that calculates a remaining life value by subtracting the first life decrease amount calculated by the calculation unit and the second life decrease amount calculated by the second life decrease amount calculation unit.

  The battery life determination method according to the present invention includes a load power measurement step for measuring a load power applied to a storage battery at the time of discharge, an environmental temperature measurement step for measuring an environmental temperature at a location where the storage battery is installed, The load power applied to the storage battery, the environmental temperature of the storage battery, and the life data indicating the relationship between the life of the storage battery and the load power measured in the load power measurement step and the environmental temperature measurement step are measured. An expected life value selection step for selecting a life corresponding to the ambient temperature as an expected life value, a discharge count counting step for counting the number of discharges of the storage battery, and the number of discharges counted by the discharge count counting step to time Based on a natural logarithm function with the measured value as a variable, a first life reduction amount for reducing the expected life value is calculated. A first life reduction amount calculating step, an average value calculating step for calculating an average value of the temperature of the storage battery at the time of charging / discharging or resting, and an elapsed time counting step for counting an elapsed time after the storage battery is installed And the expected lifetime based on the average value of the storage battery temperature calculated in the average value calculating step, the environmental temperature measured in the environmental temperature measuring step, and the elapsed time counted in the elapsed time counting step. A second life reduction amount calculating step for calculating a second life reduction amount for reducing the value, and a first life reduction amount calculating step calculated from the expected life value selected in the expected life value selection step. The remaining life value is calculated by subtracting the first life reduction amount and the second life reduction amount calculated in the second life reduction amount calculation step. And a presence life value calculating step.

  According to these configurations, the life data indicating the relationship between the load power applied to the storage battery during discharge and the environmental temperature of the place where the storage battery is installed and the life of the storage battery are stored in the life data storage unit. Then, the load power applied to the storage battery and the environmental temperature are measured, the life data stored in the life data storage unit is referred to, and the life corresponding to the measured load power and the environmental temperature is the expected life value. Selected. The number of discharges of the storage battery is counted, and a first life reduction amount for reducing the expected life value is calculated based on a natural logarithmic function having a value obtained by converting the counted number of discharges into time. Then, the average value of the temperature of the storage battery at the time of charging / discharging or a rest is calculated. The elapsed time since the installation of the storage battery is counted, and a second value for reducing the expected life value based on the calculated average value of the storage battery temperature, the measured environmental temperature, and the counted elapsed time. A life reduction amount is calculated. Thereafter, the remaining life value is calculated by subtracting the first life reduction amount and the second life reduction amount from the expected life value.

  Therefore, the life corresponding to the load power and the environmental temperature is selected as the expected life value, and the first life reduction amount calculated based on the natural logarithm function with the value obtained by converting the number of discharges into time as a variable, and the storage battery temperature Since the second life reduction amount calculated based on the average value, the environmental temperature, and the elapsed time is subtracted from the expected life value, the backup discharge at the time of power failure and the environmental temperature and elapsed time after the storage battery is installed The influence of factors not directly related to the number of discharges on the life of the storage battery can be reflected in the determination of the life of the storage battery, and the life of the storage battery can be accurately determined.

  In the battery life determination apparatus, the second life reduction amount calculation unit may calculate a difference between an average value of the storage battery temperature calculated by the average value calculation unit and an environmental temperature measured by the environmental temperature measurement unit. It is preferable to calculate the second life reduction amount by multiplying the value of the exponential function as a variable and the elapsed time counted by the elapsed time counting unit.

  According to this configuration, the second life reduction amount is calculated by multiplying the value of the exponential function having the difference between the calculated average value of the storage battery temperatures and the measured environmental temperature as a variable and the counted elapsed time. Therefore, the second life reduction amount can be accurately calculated.

  Further, in the above battery life determination device, the value of the exponential function having the difference between the environmental temperature measured by the environmental temperature measurement unit and the average value of the storage battery temperature calculated by the average value calculation unit as a variable, An expected life value calculation unit that calculates an expected life value at any time by multiplying the expected life value selected by the expected life value selection unit is further provided, and the remaining life value calculation unit is calculated by the expected life value calculation unit at any time. The remaining life is obtained by subtracting the first life reduction amount calculated by the first life reduction amount calculation unit and the second life reduction amount calculated by the second life reduction amount calculation unit from the calculated expected life value as needed. It is preferable to calculate the value.

  According to this configuration, the expected life value is calculated at any time by multiplying the value of the exponential function with the difference between the measured ambient temperature and the calculated average value of the storage battery temperature as a variable and the selected expected life value. Is done. Then, the remaining life value is calculated by subtracting the first life reduction amount and the second life reduction amount from the calculated expected life value. Therefore, the expected life value is corrected to an appropriate value at any time, and the remaining life value is calculated using the expected life value (appropriate life expectancy value) corrected to an appropriate value, further improving the accuracy of the remaining life value. Can be made.

  The battery life determination apparatus may further include a life value storage unit that stores the remaining life value calculated by the remaining life value calculation unit, and the remaining life value calculation unit is stored in the life value storage unit. It is preferable to read the remaining life value calculated last time and calculate the latest remaining life value by subtracting the first life reduction amount and the second life reduction amount from the read remaining life value.

  According to this configuration, the calculated remaining lifetime value is stored in the lifetime value storage unit. Then, the previously calculated remaining lifetime value stored in the lifetime value storage unit is read, and the first remaining lifetime value and the second decreased lifetime value are subtracted from the read remaining lifetime value to obtain the latest remaining lifetime value. Is calculated. Therefore, since the latest remaining life value is calculated by subtracting the first life decrease amount and the second life decrease amount from the previously calculated remaining life value, the calculation accuracy of the remaining life value can be improved, and the storage battery The lifetime can be determined more accurately.

  In the battery life determination apparatus, the storage battery preferably includes a nickel-hydrogen storage battery. As described above, the main reason for the life of the nickel-hydrogen storage battery is the corrosion of the hydrogen storage alloy of the negative electrode. The hydrogen storage alloy is abruptly self-pulverized due to the volume change accompanying the storage and release of hydrogen during the initial charge and discharge. At this time, the corrosion of the hydrogen storage alloy is accelerated, but if the number of discharges overlaps to some extent, the corrosion is suppressed by the self-pulverization. In addition to this, a corrosion reaction in which metal ions elute from the surface of the hydrogen storage alloy proceeds with the elapsed time since the nickel-hydrogen storage battery was installed regardless of the number of discharges. This corrosion reaction tends to be accelerated as the environmental temperature increases. Therefore, unlike lead-acid batteries that are repeatedly charged and discharged due to dissolution and precipitation of the active material, the life deterioration peculiar to nickel-hydrogen storage batteries is calculated by installing the storage battery with the amount of life reduction calculated based on the number of discharges. It is expressed by correcting by factors that are not directly related to the number of discharges such as the environmental temperature and elapsed time. Therefore, the lifetime can be accurately calculated according to the characteristics of the nickel-hydrogen storage battery.

  In the battery life determination device, the storage battery is preferably provided integrally with each part of the battery life determination device. According to this configuration, since the storage battery is provided integrally with each part of the battery life determination device, handling becomes easy. Moreover, the distance which connects a storage battery and the counting part and measurement part of a battery life determination apparatus becomes short, and wiring can be shortened.

  The battery life determination apparatus preferably further includes a notification unit that notifies the user of the remaining life value calculated by the remaining life value calculation unit. According to this configuration, since the calculated remaining life value is notified to the user, the user can know the remaining life of the storage battery and can appropriately cope with the storage battery whose remaining life has decreased.

  The battery life determination apparatus preferably further includes a transmission unit that transmits the remaining life value calculated by the remaining life value calculation unit. According to this configuration, since the calculated remaining lifetime value is transmitted, the device that has received the remaining lifetime value can perform an operation according to the remaining lifetime value.

  The battery life determination apparatus preferably further includes a charge control unit that controls charging of the storage battery based on the remaining life value calculated by the remaining life value calculation unit. According to this configuration, since the charging of the storage battery is controlled based on the calculated remaining life value, the charging of the storage battery can be controlled according to the remaining life value.

  According to the present invention, the lifetime corresponding to the load power and the environmental temperature is selected as the expected lifetime value, and the first lifetime reduction amount calculated based on the natural logarithm function using the value obtained by converting the number of discharges as time as a variable; Since the second life reduction amount calculated based on the average value of the storage battery temperature, the environmental temperature and the elapsed time is subtracted from the expected life value, the backup discharge at the time of power failure and the environment after the storage battery is installed The influence of factors that are not directly related to the number of discharges such as temperature and elapsed time on the life of the storage battery can be reflected in the determination of the life of the storage battery, and the life of the storage battery can be accurately determined.

  Hereinafter, the battery life determination apparatus according to the present embodiment will be described with reference to the drawings. It should be noted that the present invention can be implemented with appropriate modifications without departing from the scope of the present invention.

(Embodiment 1)
FIG. 1 is a block diagram showing the configuration of the battery life determination apparatus according to the first embodiment. In FIG. 1, the battery life determination device 1 includes a life determination unit 2 and a storage battery 3 built in the uninterruptible power supply. The storage battery 3 is specifically constituted by a nickel / hydrogen storage battery.

  The life determination unit 2 includes a load power measurement unit 4, a life data storage unit 5, an environmental temperature measurement unit 6, an expected life value selection unit 7, a discharge number counting unit 8a, an elapsed time counting unit 8b, a storage battery temperature measuring unit 9, an average A value calculation unit 10, a remaining life display unit 11, a control unit 12, a charge control unit 13, and a communication unit 14 are provided.

  The load power measurement unit 4 measures the value of the load power. The life data storage unit 5 stores life data in which a relationship between the load power and the battery life is obtained in advance for each environmental temperature at regular intervals in the form of a load power-battery life table. The environmental temperature measurement unit 6 measures the environmental temperature of the place where the storage battery 3 is installed. Based on the load power measured by the load power measurement unit 4 and the environmental temperature measured by the environmental temperature measurement unit 6, the expected life value selection unit 7 calculates the expected life value from the life data stored in the life data storage unit 5. Select.

  The discharge number counting unit 8 a counts the number of discharges of the storage battery 3. The elapsed time counting unit 8b counts the elapsed time since the storage battery 3 was installed. The storage battery temperature measurement unit 9 measures the storage battery temperature at regular time intervals. The average value calculation unit 10 calculates the average value by dividing the sum of the storage battery temperatures measured by the storage battery temperature measurement unit 9 by the number of measurements.

  The control unit 12 includes a first life reduction amount calculation unit 12a, a second life reduction amount calculation unit 12b, and a remaining life value calculation unit 12c. The first life reduction amount calculation unit 12a converts the number of discharges counted by the discharge number counting unit 8a into time and converts it into a life reduction amount. The second life reduction amount calculation unit 12b converts the average value of the storage battery temperature calculated by the average value calculation unit 10 and the elapsed time counted by the elapsed time counting unit 8b into a life reduction amount. The remaining life value calculation unit 12c is calculated by the first life reduction amount and the second life reduction amount calculation unit 12b calculated by the first life reduction amount calculation unit 12a from the expected life value selected by the expected life value selection unit 7. The remaining life value is calculated by subtracting the second life reduction amount.

Specifically, the expected life value is L ₀ , the number of discharges is N, the first life reduction amount is L ₁ , the elapsed time since the installation of the storage battery is D, charging / discharging measured at regular time intervals or rest Assuming that the average value of the storage battery temperature at the time is T _m , the environmental temperature when calculating the expected life value is T ₀ , the second life reduction amount is L ₂ , and the remaining life value is L, the first life is as follows: decrease amount L ₁ in (1) below, the second life reduction amount L ₂ in the (2) below, the remaining lifetime value L are respectively represented by the following expression (3).

L ₁ = a × ln (b × N) + c (1)
L ₂ = d × D × 2 ^{[Tm−T0 / 10]} (2)
L = L ₀ − (L ₁ + L ₂ ) (3)
Here, a, b, c and d are constants. Further, ln indicates a natural logarithm function.

First life reduction amount L ₁ is increased depending on the degree of corrosion of the negative electrode of hydrogen absorbing alloy. For this reason, when the battery configuration condition is changed to suppress corrosion or to be hardly affected by corrosion, the value becomes small. The values of the constants a and b vary depending on the structure of the nickel / hydrogen storage battery, for example, the thickness of the separator, but the value of the constant c is substantially constant in the nickel / hydrogen storage battery. Here, the value of the constant b has a dimension for converting the number N of discharges into time. First life reduction amount calculating unit 12a calculates a first life reduction amount L ₁ a value obtained by converting the time counted number of times of discharge N from the natural logarithm function whose variable depending on the number of discharges counting unit 8a.

Further, the average value calculating section 10 calculates an average value T _m of a battery temperature during charge and discharge or during pause measured at regular time intervals, the second life reduction amount calculating unit 12b, the average of the battery temperature calculating the value of the exponential function to the difference between the measured value T ₀ value T _m and the ambient temperature as variables, the elapsed time D and the second life reduction amount L ₂ by multiplying since established the battery. Remaining life value calculating unit 12c calculates a value obtained by subtracting the first life reduction amount L ₁ and the second life reduction amount L ₂ from the expected life value L ₀ as the remaining lifetime value L, determined lifetime. The life of nickel-metal hydride storage battery decreases exponentially with the temperature rise of the battery itself. This is because the corrosion of the hydrogen storage alloy is accelerated at higher temperatures than at normal temperature. By adding the element to the first life reduction amount L _1, it is possible to accurately determine the life of the nickel-metal hydride battery.

Second life reduction amount L ₂ will vary according to the average value T _m of a battery temperature. Therefore, when or improved construction conditions change suppressing or heat dissipation of the heat generated by the battery, the second life reduction amount L ₂ is small. The constant d is a substantially constant value depending on the type of storage battery.

  The charging control unit 13 controls the charging of the storage battery 3 based on the remaining life value calculated by the remaining life value calculating unit 12c. The communication unit 14 communicates with the uninterruptible power supply main body 15. The communication unit 14 transmits the remaining life value calculated by the remaining life value calculation unit 12 c to the uninterruptible power supply main body 15. The remaining life display unit 11 displays the remaining life value calculated by the remaining life value calculation unit 12c.

  The storage battery 3 is provided integrally with each part of the battery life determination device 1. Thereby, since the storage battery 3 is provided integrally with each part of the battery life determination apparatus 1, handling becomes easy. Moreover, the distance which connects the storage battery 3 and the counting part and measurement part of the battery lifetime determination apparatus 1 becomes short, and wiring can be shortened.

  In addition, in this Embodiment, although the storage battery 3 is provided integrally with each part of the battery life determination apparatus 1, this invention is not specifically limited to this, Even if it comprises a storage battery so that replacement | exchange (detachment) is possible. Good. That is, the battery life determination device 1 includes a detection unit that detects that the storage battery 3 has been replaced, and a reset unit that resets the number of discharges and the elapsed time when the detection unit detects that the storage battery 3 has been replaced. May be further provided. In this case, it is detected that a new storage battery 3 has been inserted, and the number of discharges and the elapsed time are reset. Therefore, even if the remaining life value of the storage battery reaches a specified value and is determined to be a life, the storage battery is replaced. The life of a new storage battery can be determined.

  Next, a battery life determination method using the battery life determination apparatus shown in FIG. 1 will be specifically described based on a flowchart. FIG. 2 is a flowchart for explaining the operation of the battery life determination device according to the first embodiment.

When a nickel-hydrogen storage battery 3 with a built-in uninterruptible power supply starts discharging, to start the battery life determining apparatus 1 is operated, obtaining the expected life value L ₀ operation (step S2 to S5), the first reduction in life the amount _{L 1} of the finding operation (step S6, S7) and a second life reduction amount _{L 2} of the seek operation (step S8 to S11) is performed. In the present embodiment, the operation for obtaining the expected life value L ₀ , the operation for obtaining the first life reduction amount L ₁ , and the operation for obtaining the second life reduction amount L ₂ are performed in time series. Is not particularly limited to this, the order of each operation may be changed, and each operation may be performed in parallel.

  First, the control unit 12 determines whether or not the nickel-hydrogen storage battery 3 built in the uninterruptible power supply has started discharging (step S1). Here, when it is determined that the discharge has not started (NO in step S1), the battery 3 enters a standby state until the storage battery 3 starts to discharge.

On the other hand, if it is determined that the start of discharge (YES in step S1), the ambient temperature measuring unit 6 measures the ambient temperature T ₀ of the location where the storage battery 3 is installed (step S2). Next, the load power measuring unit 4 measures the value of the load power applied to the storage battery 3 during discharging (step S3). Usually, the value of the load power is indicated by the time rate of the discharge current representing the discharge rate.

Next, the expected life value selection unit 7 sets the measured value of the load power measured by the load power measurement unit 4 to the value of the load power-storage battery life table closest to the environmental temperature measured by the environmental temperature measurement unit 6. Collation is performed (step S4). The relationship between the load power applied to the storage battery at the time of discharging and the storage battery life is obtained in advance at every constant environmental temperature, and this data is stored in the life data storage unit 5 such as a memory as a load power-storage battery life table. deep. That is, the lifetime data storage unit 5 stores a load power-battery lifetime table for each environmental temperature. Next, the expected life value selection unit 7 selects the expected life value L ₀ corresponding to the load power value from the load power-battery life table, and outputs it to the control unit 12 (step S5).

Next, the discharge number counting unit 8a counts the number N of discharges of the storage battery 3 and outputs it to the control unit 12 (step S6). Next, the first life reduction amount calculating unit 12a calculates a first life reduction amount L ₁ of a transformation of the number of discharges N time as a natural logarithm function with variable based on (1) (step S7 ).

  Next, the average value calculation part 10 acquires the temperature (storage battery temperature) of the storage battery 3 measured for every fixed time interval from the storage battery temperature measurement part 9 (step S8). The storage battery temperature measurement unit 9 measures the temperature of the storage battery 3 at regular time intervals.

Then, average value calculation unit 10 calculates the average value T _m based on the battery temperature measured by the battery temperature measuring unit 9 and the number of measurements (step S9). Next, the elapsed time counting unit 8b counts the elapsed time D from the installation of the storage battery 3 (step S10).

Next, the second life reduction amount calculating unit 12b, and the elapsed time D which is counted by the elapsed time counting unit 8b, and the average value T _m of a battery temperature calculated by the average value calculating unit 10, the environmental temperature measuring unit 6 By substituting the environmental temperature T ₀ measured in step (2) into the equation (2), the second life reduction amount L ₂ is calculated (step S11).

Next, the remaining life value calculation unit 12c calculates a remaining life value L based on the equation (3). That is, the remaining life value calculating unit 12c, from the expected life value L ₀ selected by the expected life value selecting unit 7, the first life reduction amount L ₁ and a second lifetime calculated by the first life reduction amount calculating unit 12a second life reduction amount L ₂ subtracts calculated by decrease amount calculation unit 12b, it calculates the remaining lifetime value L (step S12).

  The remaining life value L obtained in this way is output from the control unit 12 to the remaining life display unit 11. The remaining life display unit 11 is configured by a liquid crystal display, for example, and displays the remaining life value L calculated by the remaining life value calculation unit 12c on the screen. In the present embodiment, the remaining life value is displayed to the user by displaying the remaining life value. However, the present invention is not particularly limited to this, and the user is notified by lighting or sound of an LED or the like. You may announce life.

  For example, when notifying the user of the remaining life value using the LED, the control unit 12 makes the LED emit light with a color corresponding to the remaining life value, or determines whether the remaining life value has reached a specified value. The LED is turned on when the specified value is reached. For example, the control unit 12 turns on the LED when the remaining life value reaches zero. For example, when the remaining life value is notified to the user by voice or the like, the control unit 12 outputs a sound corresponding to the remaining life value calculated by the remaining life value calculation unit 12c from the speaker, or the remaining life value is It is determined whether or not the specified value has been reached, and when the specified value is reached, a predetermined sound is output from the speaker. For example, the control unit 12 causes a predetermined sound to be output from a speaker when the remaining life value reaches zero.

  In addition, the remaining life value L is transmitted to the uninterruptible power supply main body 15 via the communication unit 14. The uninterruptible power supply main body 15 receives the remaining life value L transmitted by the communication unit 14. The uninterruptible power supply main unit 15 includes a remaining life display unit, and displays the received remaining life value L on the remaining life display unit. In the present embodiment, the battery life determination device 1 includes a remaining life display unit 11. However, the battery life determination device 1 may not include the remaining life display unit, and the uninterruptible power supply main body 15 may include the remaining life display unit. In this case, the remaining life display unit of the uninterruptible power supply main body 15 displays the remaining life value L transmitted by the communication unit 14.

  Further, the charge control unit 13 controls charging of the discharged nickel-hydrogen storage battery 3 based on the remaining life value L. For example, the charging control unit 13 performs control so that charging is not performed when the remaining life value L becomes a specified value or less.

  In general, the nickel-hydrogen storage battery is installed in a place where it is difficult to touch the user's eyes. Therefore, the remaining life display unit 11 is provided on a part that is easily touched by the user, such as the control unit of the uninterruptible power supply main body. It is effective to provide.

(Embodiment 2)
Subsequently, a battery life determination apparatus according to Embodiment 2 will be described. The battery life determination method according to Embodiment 2 can determine the life of the nickel-hydrogen storage battery more accurately. The battery life determination method according to the second embodiment is obtained by multiplying the value of an exponential function having a difference between the measured value of the environmental temperature and the average value of the storage battery temperature as a variable and the initial expected life value, as needed. And a value obtained by subtracting the first life reduction amount and the second life reduction amount from the expected life value as needed is calculated as the remaining life value to determine the life.

Strictly speaking, the expected life value L ₀ (synonymous with the initial expected life value) in the battery life determination method of the first embodiment described above changes exponentially with the temperature history of the storage battery. By adding this element to the battery life determination method of Embodiment 1, the life of the nickel-hydrogen storage battery can be determined more accurately.

  FIG. 3 is a block diagram illustrating a configuration of the battery life determination apparatus according to the second embodiment. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The life determination unit 2 shown in FIG. 3 includes a load power measurement unit 4, a life data storage unit 5, an environmental temperature measurement unit 6, an expected life value selection unit 7, a discharge number counting unit 8a, an elapsed time counting unit 8b, and a storage battery temperature measurement. Unit 9, average value calculation unit 10, remaining life display unit 11, control unit 12, charge control unit 13, and communication unit 14.

  The control unit 12 includes a first life reduction amount calculation unit 12a, a second life reduction amount calculation unit 12b, a remaining life value calculation unit 12c, and an expected life value calculation unit 12d as needed. The anytime expected life value calculation unit 12d calculates the anytime expected life value by adding the information from the average value calculation unit 10 to the expected life value read from the life data storage unit 5. That is, the expected life value calculation unit 12d as needed has a value of an exponential function whose variable is the difference between the environmental temperature measured by the environmental temperature measurement unit 6 and the average value of the storage battery temperature calculated by the average value calculation unit 10. The expected life value is calculated at any time by multiplying the expected life value selected by the expected life value selector 7.

  The remaining life value calculation unit 12c includes a first life reduction amount and a second life reduction amount calculation unit 12b calculated by the first life reduction amount calculation unit 12a from the anytime expected life value calculated by the anytime expected life value calculation unit 12d. The remaining life value is calculated by subtracting the second life reduction amount calculated by the above.

Specifically, the expected life value is L ₀ , the expected life value is L _m , the first life reduction amount is L ₁ , the environmental temperature at the time of calculation of the expected life value L ₀ is T ₀ , charge / discharge or rest When the average value of the storage battery temperature is T _m , the second life reduction amount is L ₂ , and the remaining life value is L, the expected life value L _m is expressed by the following equation (4) as shown below. The life value L is expressed by the following equation (5).

L _m = L ₀ × 2 ^{[T0−Tm / 10]} (4)
L = L _m − (L ₁ + L ₂ ) (5)

  Next, a battery life determination method using the battery life determination device shown in FIG. 3 will be specifically described based on a flowchart. FIG. 4 is a flowchart for explaining the operation of the battery life determination device according to the second embodiment.

The processing in steps S21 to S25 in FIG. 4 is the same as the processing in steps S1 to S5 in FIG. The battery life judging process of the second embodiment, the process for obtaining the initial expected life value L ₀ to (step S5) is the same as the battery life judging process of the first embodiment, different subsequent operations Yes.

The average value calculation unit 10 acquires the temperature of the storage battery 3 (storage battery temperature) measured at regular time intervals from the storage battery temperature measurement unit 9 (step S26). The storage battery temperature measuring unit 9 measures the temperature of the storage battery 3 at regular time intervals. Then, average value calculation unit 10 calculates the average value T _m based on the battery temperature measured by the battery temperature measuring unit 9 and the number of measurements (step S27).

Then, any time the expected life value calculating unit 12d, substitutes the average value T _m of a battery temperature calculated by the ambient temperature T ₀ and the average value calculating section 10 measured by the ambient temperature measuring unit 6 in (4) It is calculated from time to time expected life value _{L m} by (step S28).

  Note that the processing in steps S29 to S32 in FIG. 4 is the same as the processing in steps S6, S7, S10, and S11 in FIG.

Then, the remaining lifetime value calculating unit 12c, by subtracting the first life reduction amount from time to time the expected life value L _m calculated by occasionally expected life value calculating unit 12d L ₁ and the second life reduction amount L _2, the remaining The lifetime value L is calculated, and the lifetime of the nickel-hydrogen storage battery 3 is determined (step S33). The process in step S34 is the same as the process in step S13 in FIG.

  According to the battery life determination method of the second embodiment, in order to calculate the life value from the load power value applied to the nickel-hydrogen storage battery 3 at the time of discharging, the life that shows the relationship between the load power, the environmental temperature, and the life in advance. Since data is prepared and the life corresponding to the measured values of the load power and the environmental temperature is selected from the life data to obtain the expected life value, the life can be accurately predicted. In addition, when the storage battery 3 is discharged due to an actual power outage, the life of the storage battery 3 that is deteriorated by the discharge is corrected, so the life of the nickel-hydrogen storage battery is accurately accurate. Can be judged well.

(Embodiment 3)
Subsequently, a battery life determination apparatus according to Embodiment 3 will be described. The battery life determination method according to Embodiment 3 can more accurately determine the life of the nickel-hydrogen storage battery. The battery life determination method according to Embodiment 3 calculates the remaining life value by subtracting the first life reduction amount and the second life reduction amount from the expected life value, and then stores the remaining life value. Each time the first life reduction amount and the second life reduction amount are subtracted, the remaining life value is updated to determine the life.

  In the battery life determination method according to Embodiment 1 described above, the first life reduction amount and the second life reduction amount are calculated, and the shorter the interval for subtracting the second life reduction amount from the remaining life value, the shorter the accuracy of the remaining life value. Will improve. By adding this element to the battery life determination method of Embodiment 1, the life of the nickel-hydrogen storage battery can be determined more accurately.

  FIG. 5 is a block diagram illustrating a configuration of the battery life determination apparatus according to the third embodiment. In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The life determination unit 2 shown in FIG. 5 includes a load power measurement unit 4, a life data storage unit 5, an environmental temperature measurement unit 6, an expected life value selection unit 7, a discharge number counting unit 8a, an elapsed time counting unit 8b, and a storage battery temperature measurement. Unit 9, average value calculation unit 10, remaining life display unit 11, control unit 12, charge control unit 13, communication unit 14, and life value storage unit 16. The control unit 12 includes a first life reduction amount calculation unit 12a, a second life reduction amount calculation unit 12b, and a remaining life value calculation unit 12c.

  The life value storage unit 16 stores the remaining life value calculated by the remaining life value calculation unit 12c. The remaining life value calculation unit 12c reads the previously calculated remaining life value stored in the life value storage unit 16, and subtracts the first life reduction amount and the second life reduction amount from the read remaining life value to obtain the latest Calculate the remaining life value. Then, the remaining life value calculation unit 12 c stores the calculated latest remaining life value in the life value storage unit 16 and updates the contents of the life value storage unit 16.

Specifically, the initial expected life value is L ₀ , the first life reduction amount is L ₁ , the environmental temperature when calculating the initial expected life value L ₀ is T ₀ , and the average storage battery temperature during charge / discharge or rest The value is T _m , the second life reduction amount is L ₂ , the latest remaining life value is L _X , the previous remaining life value is L _X−1 , and the interval at which the second life reduction amount L ₂ is subtracted from the remaining life value. If the D _X, as shown below, the second life reduction amount L ₂ in (6) below, the remaining lifetime value L _X is respectively represented by (7) below.

L ₂ = d × D _X × 2 ^{[Tm−T0 / 10]} (6)
L _X = L _X-1 − (L ₁ + L ₂ ) {X ≧ 1} (7)

  Next, a battery life determination method using the battery life determination apparatus shown in FIG. 5 will be specifically described based on a flowchart. FIG. 6 is a flowchart for explaining the operation of the battery life determination device according to the third embodiment.

  The process in step S41 in FIG. 6 is the same as the process in step S1 in FIG. In step S <b> 42, the control unit 12 determines whether or not the remaining life value calculation count X is 1. The control unit 12 stores the number of times the remaining life value is calculated. Here, when it is determined that the calculation count X is 1, that is, when the remaining life value is calculated for the first time (YES in step S42), the process proceeds to step S43. The processing of steps S43 to S46 is the same as the processing of steps S2 to S5 in FIG.

On the other hand, when it is determined that the calculation count X is not 1 (NO in step S42), the remaining life value calculation unit 12c reads the previous remaining life value stored in the life value storage unit 16 (step S47). Next, the environmental temperature measurement unit 6 measures the environmental temperature T ₀ where the storage battery 3 is installed (step S48). The processing from step S49 to S52 is the same as the processing from step S6 to S9 in FIG.

Then, the elapsed time counter 8b, when calculating the number X of the remaining lifetime value is 1, counting the elapsed time D _X from by installing a storage battery 3, when the calculated number X of remaining life value is not 1 , the last remaining lifetime value counts the elapsed time D _X from being calculated (step S53). Elapsed time counting unit 8b stores a time at which the last remaining lifetime value is calculated, last remaining lifetime value based on the time to count the elapsed time D _X from being calculated.

Next, the second life reduction amount calculating unit 12b, the elapsed and time D _X counted by the elapsed time counting unit 8b, and the average value T _m of a battery temperature calculated by the average value calculating unit 10, the environmental temperature measuring unit By substituting the environmental temperature T ₀ measured by 6 into the equation (6), the second life reduction amount L ₂ is calculated (step S54).

Next, the remaining life value calculation unit 12c calculates the latest remaining life value L _X based on the equation (7). That is, the remaining life value calculating unit 12c, when the calculated number X of remaining life value is 1, from the expected life value L ₀ selected by the expected life value selecting unit 7, calculated by the first life reduction amount calculating unit 12a has been the second life reduction amount L ₂ subtracts calculated by the first life reduction amount L ₁ and the second life reduction amount calculating unit 12b, and calculates the remaining lifetime value L. In addition, when the remaining life value calculation count X is not 1, the remaining life value calculation unit 12c uses the first remaining life value calculation unit 12a from the previous remaining life value L _X-1 read from the life value storage unit 16. the second life reduction amount L ₂ calculated by the first life reduction amount L ₁ and the second life reduction amount calculating section 12b which is calculated by subtracting, calculates the latest remaining lifetime value L _X (step S55).

Then, the remaining lifetime value calculating unit 12c stores the calculated latest remaining lifetime value L _X life value storage unit 16, and updates the stored contents of the service life value storage unit 16 (step S56). Next, the controller 12 increments the remaining life value calculation count X (step S57). The process in step S34 is the same as the process in step S13 in FIG.

  According to the battery life determination method of the third embodiment, in order to calculate the life value from the load power value applied to the nickel-hydrogen storage battery 3 at the time of discharging, the life that shows the relationship between the load power, the environmental temperature, and the life in advance. Since data is prepared and the life corresponding to the measured values of the load power and the environmental temperature is selected from the life data to obtain the expected life value, the life can be accurately predicted. In addition, when the storage battery is discharged due to an actual power failure, the life of the storage battery deteriorated by the discharge is corrected, so the life of the nickel-hydrogen storage battery is accurately and accurately determined. be able to.

  Next, in the battery life determination method of each embodiment, examples in which the remaining life value is calculated under various conditions based on the above-described equations will be described.

Example 1
In Example 1, a positive electrode in which spherical nickel hydroxide powder is filled in three-dimensional porous nickel and a negative electrode in which hydrogen storage alloy powder is applied to a nickel-plated punching metal have a theoretical capacity ratio of 1/2 (positive electrode The electrode group was configured by combining them so that the negative electrode was 2 times larger than the negative electrode and wound through a separator made of a sulfonated polypropylene nonwoven fabric. This electrode group was inserted into a cylindrical can made of iron and nickel-plated, and an electrolyte solution composed of an aqueous solution of KOH and NaOH was injected. Then, the opening of the can was sealed with a sealing plate and a gasket. Thus, a cylindrical nickel-hydrogen storage battery A having a diameter of 17 mm, a height of 50 mm, a separator thickness of 0.18 mm, and a nominal capacity of 1800 mAh was produced.

This storage battery A was incorporated in the battery life determination device of FIG. 1 and integrated with the battery life determination device. The nickel-hydrogen storage battery was sufficiently subjected to the initial activation cycle, and then subjected to the following charge / discharge test in an atmosphere of 40 ° C. The expected life value (initial expected life value) L ₀ was calculated by comparing the environmental temperature and the life information of the storage battery extracted in advance from the relationship between the discharge current values.
Charging: 900 mA, charging stopped when the voltage reaches 5 mV from the highest voltage reached (so-called -ΔV control method)
Rest: 69 hours

  After the above charging and resting, the battery was discharged to 1.0 V at a discharge current of 1800 mA. When this discharge was repeated for 300 days, 900 days, and 1500 days, the remaining life value L was calculated based on the flowchart of FIG. This battery life determination device determined that the life was reached when the remaining capacity of the nickel-hydrogen storage battery reached 1080 mAh (60% of the nominal capacity).

Expected life value L ₀ , environmental temperature when calculating it, discharge rate (expressed in time rate), and values of constants a, b, c, d in equations (1) and (2) used for life judgment In Table 1 below. No. 1 in Table 2 below shows the calculation result of the remaining life value L. It is shown in 1.

(Example 2)
In Example 2, the remaining life value L was calculated based on the flowchart of FIG. 2 using the battery life determination device and the storage battery A of Example 1 and replacing the discharge rate with time rate × 5 and time rate × 0.5. . The expected life value L ₀ , the calculation conditions, and the values of the constants a, b, c, d are shown in Table 1 below. 2 and 3, and the calculation result of the remaining life value L is No. 2 in Table 2 below. 2 and 3, respectively. In addition, No. 1 in Table 1 below. 2 represents the expected life value L ₀ when the time ratio is multiplied by 5; 3 represents the expected life value L ₀ when the time ratio is multiplied by 0.5.

(Comparative Example 1)
Comparative Example 1 is a comparative example for Examples 1-3. In Comparative Example 1, using the battery life determination device of Example 1 and the storage battery A, the linear function L = L ₀ − instead of the expressions (1) to (3) under the same conditions as in Examples 1 and 2. The remaining life value L was calculated using eN. Here, the constant e changes depending on the structure of the nickel-hydrogen storage battery, such as the thickness of the separator, and has a dimension for converting the number of discharges N into time. The expected life value L ₀ , the calculation conditions, and the value of the constant e are set as No. 1 in Table 1 below. 9 to 11 and the calculation result of the remaining life value L is No. 2 in Table 2 below. Shown in 9-11. In addition, No. 1 in Table 1 below. 9 represents an expected life value L ₀ when the time ratio is multiplied by 1, and No. 9 in Table 1 below. 10 represents the expected life value L ₀ when the time ratio is multiplied by five. 11 represents the expected life value L ₀ when the time ratio is multiplied by 0.5.

(Example 3)
In Example 3, the remaining life value L was calculated based on the flowchart of FIG. 4 using the battery life determination device and the storage battery A of Example 1. At this time, the battery life determination device calculates the remaining life value L using the equations (4) and (5). The expected life value L ₀ , the calculation conditions, and the values of the constants a, b, c, d are shown in Table 1 below. 4 and the calculation result of the remaining life value L is No. 2 in Table 2 below. 4 shows. The average value T _m of a storage battery temperature are as shown in Table 2 below.

Example 4
In Example 4, the remaining life value L was calculated under the same conditions as in Example 1 except that the battery life determination device and the storage battery A of Example 1 were used and the environmental temperature was changed to 35 ° C. The expected life value L ₀ , the calculation conditions, and the values of the constants a, b, c, d are shown in Table 1 below. No. 5 in Table 2 below shows the calculation result of the remaining life value L. As shown in FIG. In addition, No. 1 in Table 1 below. 5 represents the expected life value L ₀ when the environmental temperature is 35 ° C.

(Comparative Example 2)
Comparative Example 2 is a comparative example with respect to Example 4. In Comparative Example 2, the remaining life value L was calculated using the linear function L = L ₀ −eN under the same conditions as in Example 4 using the battery life determination device and the storage battery A of Example 1. The constant e is the same as in Comparative Example 1. The expected life value L ₀ , the calculation conditions, and the value of the constant e are set as No. 1 in Table 1 below. No. 12 in Table 2 below shows the calculation result of the remaining life value L. 12 shows. In addition, No. 1 in Table 1 below. 12 represents an expected life value L ₀ when the environmental temperature is set to 35 ° C.

(Example 5)
In Example 5, a cylindrical nickel-hydrogen storage battery B having a structure similar to that of Example 1 except that the separator thickness is 0.18 mm and the nominal capacity is 1600 mAh, and the separator thickness is 0.1. A cylindrical nickel-hydrogen storage battery C similar to Example 1 was produced except that the thickness was 26 mm and the nominal capacity was 1400 mAh. For these storage batteries B and C, the remaining life value L was calculated under the same conditions as in Example 1. The expected life value L ₀ , the calculation conditions, and the values of the constants a, b, c, d are shown in Table 1 below. 6 and 7 and the calculation result of the remaining life value L is shown in Table 2 below. 6 and 7. In addition, No. 1 in Table 1 below. 6 represents an expected life value L ₀ when the storage battery B is used. 7 represents an expected life value L ₀ when the storage battery C is used.

(Comparative Example 3)
Comparative Example 3 is a comparative example for Example 5. In Comparative Example 3, the remaining life value L was calculated using the linear function L = L ₀ −eN under the same conditions as in Example 5 using the battery life determination device and the storage batteries B and C of Example 5. The constant e has a dimension for converting the number of discharges N into time as in the first comparative example. The expected life value L ₀ , the calculation conditions, and the value of the constant e are set as No. 1 in Table 1 below. 13 and 14 and the calculation result of the remaining life value L is shown in No. 2 of Table 2 below. 13 and 14. In addition, No. 1 in Table 1 below. 13 represents an expected life value L ₀ when the storage battery B is used. 14 represents an expected life value L ₀ when the storage battery C is used.

(Reference example)
In the reference examples, examples 1 instead of (1) for calculating a first life reduction amount L _1, and calculates the first life reduction amount L ₁ on the basis of the following equation (8). The constant f in the equation (8) has the same meaning as the constant b, but does not have a dimension for converting the number of discharges N into time. Further, in the reference example, instead of equation (2) for calculating the second life reduction amount L ₂ in Example 1, it was calculated second life reduction amount based on the following equation (9). Note that g in equation (9) is a constant. That is, the remaining life value L was once calculated in the dimension of the number of discharges. Thereafter, the time required for one charge / discharge was 72 hours (3 days), and the life was predicted in the dimension of time. The expected life value L ₀ , the calculation conditions, and the values of constants a, c, f, and g are shown in No. 1 of Table 1 below. 8 and the calculation result of the remaining life value L is No. 2 in Table 2 below. It is shown in FIG.

L ₁ = a × ln (f × N) + c (8)
L ₂ = g × N × 2 ^{[Tm−T0 / 10]} (9)

(Example 6)
In Example 6, the remaining life value L (L _X ) was calculated based on the flowchart of FIG. 6 using the battery life determination device and the storage battery A of Example 1. At this time, the battery life judging device (6) to calculate a second life reduction amount L ₂ was used to calculate the remaining lifetime value L (L _X) using equation (7). The expected life value L ₀ , the calculation conditions, and the values of the constants a, b, c, d are shown in Table 1 below. 15 and the calculation result of the remaining life value L (L _X ) is shown in No. 2 of Table 2 below. As shown in FIG.

In Example 6, the second life reduction amount L ₂ calculated for each 300 days, was subtracted from the remaining life value. Second life reduction amount L ₂ calculated at this time are as shown in Table 3 below. Table 3 shows the mean value T _m and the second life reduction amount L ₂ of the storage battery temperatures calculated for each 300 days. FIG. 7 is a diagram showing the transition of the remaining life value with respect to the elapsed time in Example 6, Example 1, and Reference Example. In FIG. 7, a square point 71 represents the transition of the remaining life value calculated in the first embodiment, the triangle point 72 represents the transition of the remaining life value calculated in the reference example, and the diamond point 73 represents the embodiment. 6 represents the transition of the remaining life value calculated in FIG.

  Table 2 shows the difference between the value of the remaining life value L obtained in each of the above Examples 1 to 6, Comparative Examples 1 to 3, and Reference Example and the measured value for each elapsed time (days). The number of days of deviation is calculated by subtracting the actual measurement value from the value obtained by adding the elapsed days to the remaining life value L. For example, no. 1, the remaining life value L after 300 days is 1061 days, and the actual measurement value is 1530 days. Therefore, the actual measurement value is subtracted from the number of days obtained by adding 300 days to the remaining life value L, and the deviation day is −169 days. Become.

  From Table 2, NO. In Comparative Examples 1 to 3 shown in Nos. 9 to 14, the deviation from the actual measurement value is remarkable. It can be seen that Examples 1 to 6 shown in 1 to 7 have a slight deviation from the actually measured values. This tendency becomes stronger as the elapsed time increases. The reason for this is that while the corrosion of the hydrogen storage alloy subsides with repeated cycles, it depends on the elapsed time since the installation of the nickel-hydrogen storage battery regardless of the number of discharges. This is considered to be possible to approximate.

  On the other hand, although the reference example (No. 8) which did not consider the factor that does not relate to the number of discharges, the elapsed time, was not as large as Comparative Examples 1 to 3, but the deviation from the measured value was significant. Particularly in the case of this example, the battery is configured such that the theoretical capacity of the negative electrode is twice that of the theoretical capacity of the positive electrode. Therefore, the life deterioration rate of the battery greatly deviates from the linear function. It is thought that having approached was influenced.

  No. Nos. 1 to 3 shown in the results of Nos. The determination result of Example 3 shown in FIG. 4 is more accurate as the elapsed time becomes longer. The reason for this is considered that Example 3 became easier to consider the heat generation of the battery and the change in environmental temperature associated with charging and discharging than Examples 1 and 2.

Furthermore, no. 4 from the determination result of Example 3 shown in FIG. The determination result of Example 6 shown in FIG. 15 is more accurate as the elapsed time becomes longer. The reason for this is believed to be because the accuracy of calculating the second life reduction amount L ₂ is increased. That is, when calculating the life reduction amount after 1200 days, 4, the average value T _m of the storage battery temperature during 1200 days is calculated to calculate the second life reduction amount L ₂ . In 15, it calculates the second life reduction amount _{L 2} each calculated 300 days the average value _{T m} of a battery temperature every 300 days. Then, each time the second life reduction amount L _2, since the subtracted from the remaining lifetime value L, the accuracy of the remaining lifetime value L is considered to have improved. Therefore, the average value T _m of the storage battery temperature measured after 1200 days was 51 ° C. No. 4 Towards 15, the second life reduction amount L _2, believed could more accurately calculated. Similarly, the average temperature of the storage battery measured after 1500 days was 34 ° C. No. 4 Towards 15, the second life reduction amount L _2, believed could more accurately calculated.

  In Examples 1-6, a metal battery can with relatively high heat dissipation was used. However, when a resin battery case with low heat dissipation was used, the determination was made according to equations (4) and (5). It is thought that the effect of becomes more remarkable.

  Furthermore, in the first to sixth embodiments, intermittent charging of the -ΔV control method is selected as the battery charging method, but intermittent charging such as a temperature control method such as a dT / dt control method or a timer control method, or trickle charging is performed. Even when it is performed, almost the same result is obtained.

  The battery life determination device and the battery life determination method according to the present invention can accurately determine the life of a storage battery, and as a battery life determination device and a battery life determination method for determining the life of a storage battery used for an uninterruptible power supply or the like Useful.

1 is a block diagram illustrating a configuration of a battery life determination device according to Embodiment 1. FIG. 4 is a flowchart for explaining the operation of the battery life determination device according to the first embodiment. 6 is a block diagram illustrating a configuration of a battery life determination device according to Embodiment 2. FIG. 6 is a flowchart for explaining the operation of the battery life determination device according to the second embodiment. 6 is a block diagram illustrating a configuration of a battery life determination device according to Embodiment 3. FIG. 10 is a flowchart for explaining the operation of the battery life determination device according to the third embodiment. In Example 6, Example 1, and a reference example, it is a figure which shows transition of the remaining life value with respect to elapsed time.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery life determination apparatus 2 Life determination part 3 Storage battery 4 Load electric power measurement part 5 Life data storage part 6 Environment temperature measurement part 7 Expected life value selection part 8a Discharge count part 8b Elapsed time counter part 9 Storage battery temperature measurement part 10 Average value Calculation unit 11 Remaining life display unit 12 Control unit 12a First life decrease calculation unit 12b Second life decrease calculation unit 12c Remaining life value calculation unit 12d Expected life value calculation unit 13 Charging control unit 14 Communication unit

Claims (10)

A life data storage unit that stores life data indicating the relationship between the load power applied to the storage battery at the time of discharge and the environmental temperature of the place where the storage battery is installed, and the life of the storage battery,
A load power measurement unit that measures load power applied to the storage battery;
An environmental temperature measuring unit for measuring the environmental temperature;
With reference to the lifetime data stored in the lifetime data storage unit, the lifetime corresponding to the load power measured by the load power measurement unit and the environmental temperature measured by the environmental temperature measurement unit is selected as an expected lifetime value An expected life value selection unit,
A discharge number counting unit for counting the number of discharges of the storage battery;
A first life reduction amount for calculating a first life reduction amount for reducing the expected life value based on a natural logarithm function having a variable obtained by converting the number of discharges counted by the discharge number counting unit into time. A calculation unit;
An average value calculating unit for calculating an average value of the temperature of the storage battery at the time of charging / discharging or at rest;
An elapsed time counting unit for counting the elapsed time since the storage battery was installed;
Based on the average value of the storage battery temperature calculated by the average value calculation unit, the environmental temperature measured by the environmental temperature measurement unit, and the elapsed time counted by the elapsed time counting unit, the expected life value is calculated. A second life reduction amount calculating unit for calculating a second life reduction amount for reducing;
The first life reduction amount calculated by the first life reduction amount calculation unit and the second life reduction amount calculated by the second life reduction amount calculation unit from the expected life value selected by the expected life value selection unit. A battery life determination device comprising: a remaining life value calculation unit that subtracts and calculates a remaining life value.   The second life reduction amount calculating unit includes a value of an exponential function using a difference between an average value of the storage battery temperature calculated by the average value calculating unit and an environmental temperature measured by the environmental temperature measuring unit as a variable, The battery life determination device according to claim 1, wherein the second life reduction amount is calculated by multiplying the elapsed time counted by the elapsed time counting unit. The value of the exponential function having the difference between the environmental temperature measured by the environmental temperature measuring unit and the average value of the storage battery temperature calculated by the average value calculating unit, and the expectation selected by the expected life value selecting unit It further includes an occasional expected life value calculation unit that multiplies the life value by time to calculate an expected life value at any time,
The remaining life value calculation unit calculates the first life decrease amount and the second life decrease amount calculated by the first life decrease amount calculation unit from the arbitrarily expected life value calculated by the anytime expected life value calculation unit. 3. The battery life determination device according to claim 1, wherein the remaining life value is calculated by subtracting the second life reduction amount calculated by the unit. A life value storage unit for storing the remaining life value calculated by the remaining life value calculation unit;
The remaining life value calculation unit reads the previously calculated remaining life value stored in the life value storage unit, and subtracts the first life reduction amount and the second life reduction amount from the read remaining life value. The latest remaining life value is calculated, and the battery life determination device according to any one of claims 1 to 3.   The battery life determination device according to claim 1, wherein the storage battery includes a nickel-hydrogen storage battery.   The battery life determination device according to claim 1, wherein the storage battery is provided integrally with each part of the battery life determination device.   The battery life determination device according to claim 1, further comprising a notification unit that notifies a user of the remaining life value calculated by the remaining life value calculation unit.   The battery life determination apparatus according to claim 1, further comprising a transmission unit that transmits the remaining life value calculated by the remaining life value calculation unit.   The battery life determination device according to claim 1, further comprising a charge control unit that controls charging of the storage battery based on the remaining life value calculated by the remaining life value calculation unit. . A load power measurement step for measuring the load power applied to the storage battery during discharge;
An environmental temperature measuring step for measuring an environmental temperature of a place where the storage battery is installed;
The load power and the environmental temperature measurement step measured in the load power measurement step with reference to life data indicating the relationship between the load power applied to the storage battery during discharge and the environmental temperature of the storage battery and the life of the storage battery An expected life value selection step for selecting, as an expected life value, a life corresponding to the environmental temperature measured in
A discharge number counting step for counting the number of discharges of the storage battery;
A first life reduction amount for calculating a first life reduction amount for reducing the expected life value based on a natural logarithm function having a value obtained by converting the number of discharges counted in the discharge count counting step into time. A calculation step;
An average value calculating step for calculating an average value of the temperature of the storage battery during charging / discharging or at rest;
An elapsed time counting step for counting an elapsed time since the storage battery was installed; and
Based on the average value of the storage battery temperature calculated in the average value calculating step, the environmental temperature measured in the environmental temperature measuring step, and the elapsed time counted in the elapsed time counting step, the expected life value is calculated. A second life reduction amount calculating step for calculating a second life reduction amount for reducing;
The first life reduction amount calculated in the first life reduction amount calculation step and the second life reduction amount calculated in the second life reduction amount calculation step from the expected life value selected in the expected life value selection step. And a remaining life value calculating step of calculating a remaining life value by subtraction.

Images