JP2006140094A - Control device of lithium ion battery, capacity calculating method, and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To conduct control when a lithium ion secondary battery is used for backup. <P>SOLUTION: A control device 1 of the lithium ion secondary battery is equipped with a receiving means (an interface part 5) receiving information on current measured values in charge discharge of a control object lithium ion secondary battery 13, information on temperature measured values of the lithium ion secondary battery 13, and information on power supply of a commercial power source 14, and an operation means (an operating part 3) judging a charge discharge state of the lithium ion secondary battery 13 based on the information on the received power supply and the information on the received current measured values, in the waiting state not conducting charge discharge, calculating the residual capacity and residual life of the lithium ion secondary battery 13 based on the information on the received current and temperature measured values, in the discharge state, calculating the residual capacity of the lithium ion secondary battery 13 based on the information on the received discharge current measured values, and in the charge state, calculating the residual capacity of the lithium ion secondary battery 13 based on the information on the received charge current measured values. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lithium ion battery management device, a capacity calculation method, and a computer program. In particular, the present invention relates to a lithium ion battery management device, a capacity calculation method, and a computer program for managing the state of an assembled battery of a lithium ion secondary battery that is used for backup in various power sources such as communication.

Conventionally, in communication power supplies and emergency power supplies, storage batteries have been used for backup purposes, and lead storage batteries have become the mainstream as storage batteries installed for such purposes. Lead-acid batteries have many uses, have stable performance when used for a long time, and have high reliability. The most distinctive feature of lead-acid batteries is that although the output voltage is as low as 2V, it is possible to produce a battery with a large capacity of several thousand Ah, and a simple charger without installing a special battery protection device. For example, the battery can be charged in a connected state, and the increase in voltage due to the use of the aqueous electrolyte solution can be suppressed. In particular, if an aqueous electrolyte is used, even if the battery is overcharged due to a rectifier problem, the battery will undergo an electrolysis reaction after the completion of the battery charging reaction, so the terminal voltage will rise maximum. The value becomes the progress voltage of this reaction (about 3 V), and there is a safe operation that further voltage increase is suppressed.
As described above, the lead-acid battery has features that are very easy to use when used in a power supply system. However, since most of the batteries are occupied by lead-based materials that are electrode materials, the battery weight and volume per unit energy are large. That is, when the same energy is stored, the occupied space of the battery is large and the weight is increased. Such a problem can be solved by using a secondary battery having a small battery weight / volume per unit energy, in other words, a large discharge energy per unit weight / volume.

Among the secondary batteries, there is a lithium ion secondary battery as a battery having a large energy density. FIG. 14 is a diagram for explaining the principle of a lithium ion battery.
A lithium ion secondary battery is a battery constructed using lithium and metal oxides for the positive electrode and a carbon-based material for the negative electrode, and the reaction during charging and discharging is performed with the negative electrode of lithium ions liberated from the positive electrode material. By moving at the positive electrode. At the time of charging, lithium ions are trapped in the carbon, and at the time of discharging, lithium ions move to the positive electrode oxide and are taken into the inside.
Since this lithium ion secondary battery has a high energy density, it greatly contributes to a reduction in size and weight of the mounted device, and has been widely used in mobile phone terminals, personal computers and the like. In such a small device, since the operating voltage of the device is low and the output voltage of the lithium ion secondary battery is about 4V, it is possible to operate the device only by connecting one or three batteries in series. . Lithium-ion secondary batteries contribute to the downsizing of equipment in this way, but unlike lead-acid batteries, electrolytes based on organic liquids are used. The rise suppression function does not work. Therefore, at the time of charging, it is necessary to monitor the terminal voltage and take measures to prevent the rise. Further, at the time of discharging, it is necessary to stop the discharging when the terminal voltage is lowered to a certain value. This is because copper (negative electrode side) used as a conductive material serving as an electrical path from the electrode to the load starts to dissolve as ions at a voltage lower than the previous voltage. The dissolved copper ion becomes an impediment to the battery reaction as an impurity.

  Thus, when using this lithium ion secondary battery, it is necessary to control charge and discharge by monitoring voltage. Further, it is necessary to take measures such as monitoring the temperature and stopping the charging of the battery when a certain temperature is reached. Conventionally, charging control of a lithium ion secondary battery by temperature monitoring or the like is performed in a mobile phone (for example, see Non-Patent Document 1). A dedicated IC has also been developed for charge control for such a lithium ion secondary battery (see, for example, Non-Patent Document 2).

  On the other hand, in recent years, a lithium ion secondary battery having a capacity of 100 Ah for electric vehicles has been developed. Such an assembled battery of a lithium ion secondary battery is used together with a charge control circuit of the assembled battery, and charge / discharge control and monitoring of each cell voltage are performed (for example, Non-Patent Document 3). reference). However, the usage pattern of a battery used for an electric vehicle is repetitive charging / discharging, and is such that charge control and discharge management are performed.

Under such circumstances, in recent years, lithium ion secondary batteries for backup used for general power supplies are also being manufactured. However, when used with a backup power source, in addition to the charge / discharge control as described above, it is desirable to know the remaining usable years of the storage battery, the remaining capacity, and the like as the grasp of the state of the storage battery. In a communication power supply system, there is a remote monitoring device for a sealed lead storage battery used as a standby power supply, and measurement of the terminal voltage and internal resistance of the storage battery is performed (for example, see Non-Patent Document 4). ). However, regarding a lithium ion secondary battery, since this battery was rarely used for backup, a management device for a lithium ion secondary battery has not been developed.
Kazuhiko Takeno, et-al, “Methods of Energy Conservation and Management for Commercial Li-ion Battery Packs of Mobile Phones”, INTELE03 Newsletter (Proceeding of INTELE03), 15-1, pp. 310 “2001 Battery Technology Symposium”, 4-2-1, Japan Management Association GS News Technical Report, Vol. 59, No2, pp. 23, 2000 Kiyoshi Takahashi, Yuichi Watakabe, “Development of SOH Monitoring System for Industrial VRLA Battery String”, INTELEC03 Bulletin (Proceeding of INTELEC03), 35 -1, pp. 664

As described above, as a management system when a lithium ion secondary battery is used for backup in a power supply system, in addition to charge / discharge control, it has been desired to determine the remaining usable years of the storage battery, the remaining capacity, etc. .
However, since this battery has hardly been used for backup, a dedicated management device for a lithium ion secondary battery has not been developed. For this reason, when a lithium ion secondary battery is incorporated in a backup power source as an assembled battery and used, it is difficult to manage the battery because it cannot perform daily state management of the battery and grasp the remaining battery capacity during discharge / recovery charging. It was.

  The present invention has been made in view of such circumstances, and provides a lithium ion battery management device, capacity calculation method, and computer program capable of performing management when a lithium ion secondary battery is used for backup. Its purpose is to provide.

  In order to solve the above problems, the present invention provides information on measured values of current in charge / discharge of a lithium ion secondary battery to be managed, information on measured values of temperature of the lithium ion secondary battery, and power supply of a commercial power source. The charging means of the lithium ion secondary battery is determined on the basis of the receiving means for receiving the information and the information on the power supply and the current measurement value received via the receiving means, and charging / discharging is performed. In the non-standby state, the remaining capacity and the remaining life of the lithium ion secondary battery are calculated based on the temperature measurement value information received through the receiving unit. The remaining capacity of the lithium ion secondary battery is calculated on the basis of the information on the measured value of the discharge current received in the above-mentioned manner, and in the charged state, on the basis of the information on the measured value of the charging current received through the receiving means. Calculating means for calculating the remaining capacity of the lithium ion secondary battery, a management device of a lithium ion battery, characterized in that it comprises a.

  The present invention also relates to the above-described lithium ion battery management device, which is the life time data of a lithium ion secondary battery at a standard temperature, and the lifetime when the lithium ion secondary battery is continuously used at this temperature. Stores relational data with a certain continuous life period, capacity deterioration characteristic data of a lithium ion secondary battery over time, and temperature change characteristic data of the storage battery capacity indicating the relation between the temperature of the lithium ion secondary battery and the storage battery capacity. The battery basic data storage means is further provided, and the calculating means is based on the relational data between the temperature in the battery basic data storage means and the continuous life period, and the continuous life period Ls at the standard temperature and the temperature exceeding the standard temperature. The continuous life period Lt is read out, and the ratio Ls / Lt between the continuous life period Ls and the continuous life period Lt is determined as the standard temperature. A use period conversion means for converting a use period at a temperature exceeding the standard temperature into a use period at the standard temperature by multiplying the use period at a temperature exceeding the standard temperature; and the lithium ion secondary at a temperature equal to or lower than the standard temperature. The total of the usage period of the battery and the cumulative usage period obtained by converting the usage period of the lithium ion secondary battery at a temperature exceeding the standard temperature into the usage period at the standard temperature by the usage period conversion means are added. A remaining life calculating means for calculating the remaining life by subtracting the calculated use time in the standard state from the life time at the standard temperature read from the battery basic data storage means. In the standby state, the standard state calculated by the remaining life calculation means The storage battery capacity corresponding to the usage period is acquired from the capacity deterioration characteristic data in the battery basic data storage means, and the acquired storage battery capacity is referred to the temperature change characteristic data of the storage battery capacity in the battery basic data storage means. A first remaining capacity obtaining means for obtaining a remaining capacity in terms of a storage battery capacity at the temperature of the lithium ion secondary battery, and a discharge obtained from the received information on the measured value of the discharge current in a discharged state. A second remaining capacity acquisition unit that calculates a remaining capacity by subtracting a discharge electric quantity calculated by a product of a measured current value and a discharge duration from the remaining capacity acquired by the first remaining capacity acquisition unit; In the state of charge, the amount of charge electricity calculated by the product of the measurement value of charge current and the charge duration obtained from the information of the measurement value of the received charge current, And a third remaining capacity acquisition means for calculating the remaining capacity by adding to the remaining capacity at the time when the power failure calculated by the second remaining capacity acquisition means is recovered.

  Further, the present invention is the above-described lithium ion battery management device, wherein the receiving means further receives information on a measured value of the voltage of the lithium ion secondary battery, and the voltage received by the receiving means. According to the measurement value information, when it is determined that the voltage of the lithium ion secondary battery exceeds a predetermined range, an output means for outputting an alarm is further provided.

  Further, the present invention is the above-described lithium ion battery management device, wherein the receiving means receives information on measured current values from a current sensor whose detection end is connected to a charge / discharge line of the lithium ion secondary battery. Receives temperature information from a battery temperature sensor connected to the lithium ion secondary battery in the vicinity of the lithium ion secondary battery, and detects power from a power failure detection sensor connected to the commercial power supply line. It receives power supply information, and receives voltage measurement information from a voltage sensor whose detection end is connected to a terminal of at least one lithium ion secondary battery.

  Further, the present invention is a capacity calculation method used in a lithium ion battery management device, comprising information on measured current values in charge / discharge of a lithium ion secondary battery to be managed, temperature of the lithium ion secondary battery Based on the reception process of receiving measurement value information and commercial power supply information, and determining the charging / discharging state of the lithium ion secondary battery based on the received power supply information and current measurement value information. In the standby state where charging / discharging is not performed, the remaining capacity and the remaining life of the lithium ion secondary battery are calculated based on the received temperature measurement information, and in the discharged state, the received discharge The remaining capacity of the lithium ion secondary battery is calculated based on the measured current information, and in the charged state, the lithium ion secondary battery is calculated based on the received measured charging current information. A calculation process of calculating the remaining capacity of the pond, a capacity calculation method of a lithium ion battery characterized by having a.

  Further, the present invention is a method for calculating the capacity of a lithium ion battery as described above, wherein the lithium ion battery management device includes a life time data of a lithium ion secondary battery at a standard temperature, a temperature and a lithium ion secondary battery at this temperature. Data showing the relationship with the continuous life period, which is the life when the secondary battery is used continuously, capacity deterioration characteristics data over time of the lithium ion secondary battery, and the relationship between the temperature of the lithium ion secondary battery and the storage battery capacity Battery basic data storage means for storing temperature change characteristic data of storage battery capacity, and the calculation process is based on the relationship between the temperature in the battery basic data storage means and the continuous life period, the continuous life period at the standard temperature Ls and a continuous life period Lt at a temperature exceeding the standard temperature are read, and the continuous life period Ls and the continuous life period L A period of use conversion process for converting a period of use at a temperature exceeding the standard temperature into a period of use at the standard temperature by multiplying the ratio Ls / Lt by the period of use at a temperature exceeding the standard temperature, Integration of the use period of the lithium ion secondary battery at a temperature below the standard temperature, and use of the lithium ion secondary battery at a temperature exceeding the standard temperature at the standard temperature by the use period conversion process The usage period in the standard state is calculated by adding the integration of the usage period converted into the period, and the calculated usage period in the standard state is subtracted from the lifetime in the standard temperature read from the battery basic data storage means. The remaining life calculation process for calculating the remaining life and the remaining life calculation process in the standby state. The storage battery capacity corresponding to the used period of use in the standard state is acquired from the capacity deterioration characteristic data in the battery basic data storage means, and the acquired storage battery capacity is calculated as the storage battery capacity in the battery basic data storage means. A first remaining capacity acquisition process in which the remaining capacity is obtained by converting the storage battery capacity at the temperature of the lithium ion secondary battery with reference to the temperature change characteristic data, and the measured value of the received discharge current in the discharge state A discharge capacity calculated from the product of the measured value of the discharge current obtained from the information and the discharge duration is subtracted from the remaining capacity acquired in the first remaining capacity acquisition process to calculate the remaining capacity Calculated by the product of the remaining capacity acquisition process and the charge current measurement value obtained from the received charge current measurement value information and the charge duration in the state of charge. And a third remaining capacity acquisition process for calculating the remaining capacity by adding the amount of charged electricity to be added to the remaining capacity at the time when the power failure calculated by the second remaining capacity acquisition process is recovered. And

  Further, the present invention is the above-described method for calculating the capacity of the lithium ion battery, wherein in the reception process, the information on the measurement value of the voltage of the lithium ion secondary battery is further received, and the measurement value of the received voltage is received. According to the above information, when it is determined that the voltage of the lithium ion secondary battery has exceeded a predetermined range, an output process of outputting an alarm is further provided.

  The present invention is also a computer program used in a lithium ion battery management device, comprising information on measured current values in charge / discharge of a lithium ion secondary battery to be managed, and measurement of the temperature of the lithium ion secondary battery. A charging step of receiving the charging information of the lithium ion secondary battery based on the receiving step of receiving the information of the value and the power supply information of the commercial power supply, and the information of the received power supply information and the current measurement value, In the standby state where no discharge is performed, the remaining capacity and remaining life of the lithium ion secondary battery are calculated based on the received temperature measurement value information. In the discharge state, the measured value of the discharge current is calculated. The remaining capacity of the lithium ion secondary battery is calculated based on the information, and in the charged state, the lithium ion secondary battery is calculated based on the received measurement information of the charging current. A calculating step of calculating a remaining capacity of a computer program for causing a computer to execute the.

  According to the present invention, the lithium ion battery management device calculates the remaining capacity and the remaining life from the measured value of the lithium ion secondary battery temperature when the lithium ion secondary battery is not charged or discharged. In the discharged state, the remaining capacity is calculated from the measured value of the discharge current of the lithium ion secondary battery, and in the charged state, the remaining capacity is calculated from the measured value of the charge current of the lithium ion secondary battery. In addition, the battery state such as the remaining life and remaining capacity of the lithium ion secondary battery can be grasped in total. Thereby, it becomes possible to maintain a lithium ion secondary battery as needed, and there exists a big advantage in management of a lithium ion secondary battery. In addition, by applying this management device to lithium ion secondary battery charging devices, it can greatly contribute to improving the reliability of power supply facilities using lithium ion secondary batteries. Can be obtained.

Hereinafter, a lithium ion battery management device of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of a lithium ion battery management device according to an embodiment of the present invention. The figure is an example in a so-called floating charging system in which a storage battery (lithium ion secondary battery) is connected in parallel with a load to the output of a charger (rectifier). In addition to this example, there is a “trickle charging method” that is maintained by charging the storage battery independently without being connected to the load, but the basic concept regarding battery management is the same as any charging method. .

In the figure, 1 is a lithium ion battery management device (hereinafter simply referred to as “management device”), 2 is a battery basic data storage unit, 3 is a calculation unit (calculation means, usage period conversion means, remaining life calculation means) , First remaining capacity acquisition means, second remaining capacity acquisition means, third remaining capacity acquisition means), 4 a display section (output means), 5 an interface section (reception means), 6 a current sensor, 7 Is a battery temperature sensor, 8 is a battery voltage sensor, 9 is a power failure detection sensor, 10 is an external output interface unit (output means), 11 is an external remote monitoring device, 12 is a circuit cutoff switch, and 13 is a lithium ion secondary battery. , 14 is a commercial power source, 15 is a charger, and 16 is a load.
The electric power supplied from the commercial power supply 14 is charged in the charger 15, and the charger 15 outputs electric power to the lithium ion secondary battery 13 (hereinafter also simply referred to as “storage battery”) and the load 16. The lithium ion secondary battery 13 is an assembled battery of lithium ion secondary batteries, and is connected to the charger 15 and the load 16 via the circuit cutoff switch 12. The circuit cut-off switch 12 opens and closes the charge / discharge line of the lithium ion secondary battery 13 according to an instruction from the management device 1, and when the circuit cut-off switch 12 is closed, the discharge power is transferred from the lithium ion secondary battery 13 to the load 16. Output is performed, or charging power is output from the charger 15 to the lithium ion secondary battery 13. The detection end of the current sensor 6 is connected to the charge / discharge line of the lithium ion secondary battery 13 and measures the current charged and discharged by the lithium ion secondary battery 13. The detection end of the battery temperature sensor 7 is connected in the vicinity of the lithium ion secondary battery 13 and measures the temperature of the lithium ion secondary battery 13. The detection end of the battery voltage sensor 8 is connected to a terminal of at least one lithium ion secondary battery 13 and measures the voltage of the lithium ion secondary battery 13. The detection end of the power failure detection sensor 9 is connected to the power supply line of the commercial power source 14 and detects the state of power feeding from the commercial power source 14 or the charger 15 such as recovery from a power failure or power failure.

  The management device 1 includes a battery basic data storage unit 2, a calculation unit 3, a display unit 4, an interface unit 5, and an external output interface unit 10. Signals from the current sensor 6, the battery temperature sensor 7, the battery voltage sensor 8, and the power failure detection sensor 9 are input to the interface unit 5. The external output interface unit 10 is used when remotely monitoring the state of the lithium ion secondary battery 13 to be managed. Each time the information on the lithium ion secondary battery 13 is needed, the external output interface unit 10 10 is transmitted to the remote monitoring apparatus 11 at a remote location.

  The battery basic data storage unit 2 includes life time data at a standard temperature, relationship data between temperature and continuous life time (see FIG. 2 to be described later), capacity deterioration characteristic data (see FIG. 4 to be described later), and storage battery capacity temperature. Change characteristic data (see FIG. 5 described later) is stored. The life time data at the standard temperature of the battery is a usable period of the lithium ion secondary battery 13 at a predetermined standard temperature, such as “continuous 10 years at a constant temperature of 25 ° C.” It is converted into data as a part of single numerical data indicating the lifetime in temperature, or data indicating the correlation between temperature and continuous lifetime (see FIG. 2 described later), and is stored in the battery basic data storage unit 2 .

  The calculation unit 3 refers to various data stored in the battery basic data storage unit 2 and uses input values from various external sensors to hold the capacity, remaining life, and discharge electric energy of the lithium ion secondary battery 13. , Calculate the amount of charge, the percentage charged, etc., and measure the discharge duration and elapsed charge time.

Next, a method for calculating the remaining life of the lithium ion secondary battery 13 executed by the calculation unit 3 of the management device 1 will be described.
FIG. 2 shows the relationship data between the temperature and the continuous lifetime stored in the battery basic data storage unit 2 of the management device 1. The calculation unit 3 uses the relationship data between the temperature and the continuous life period shown in FIG. The continuous life period indicates a life when the lithium ion secondary battery 13 is continuously used at a certain temperature. The relationship data between the temperature and the continuous lifetime shown in the figure shows the relationship between the lifetime at a standard temperature (eg, 25 ° C.) and the lifetime at a temperature higher than this, and is obtained for the lithium ion secondary battery 13 to be installed. It is stored in the battery basic data storage unit 2 in the management device 1. The criteria for determining the lifetime is determined according to the use conditions, such as when the initial capacity is reduced by 30%. In the case of a lead storage battery, “30% capacity reduction”, “20% capacity reduction”, and the like are used as criteria. Using this relationship data between temperature and continuous life period, the physical time when used at each temperature for a certain period can be converted to the standard state, that is, the period corresponding to the use at the standard temperature. . In this conversion, the continuous life period determined by the standard temperature is “Ls”, the continuous life period at the time of continuous use determined by the temperature t higher than the standard temperature is “Lt”, and the use period at the temperature t higher than the standard temperature is “ D ”is calculated by multiplying the use period“ D ”at a temperature higher than the above-mentioned standard temperature by the above-mentioned life period ratio“ Ls / Lt ”.

That is,
60 ° C. (= t): continuous life period 1 year (Lt),... (Intermediate: abbreviated)... 25 ° C. (standard temperature): continuous life period 10 years (Ls)
It is assumed that the relationship is obtained as shown in the relationship data between the temperature and the continuous lifetime. At this time, when used for 0.5 years (D) at a temperature 60 ° C. higher than the standard temperature, the conversion usage period at the standard temperature 25 ° C. in this period is calculated by (Equation 1).

  Conversion use period at standard temperature = D × (Ls / Lt) = 0.5 × (10/1) = 5 (year) (Formula 1)

Actually, the temperature changes with time depending on the installation environment. Therefore, the calculation unit 3 of the management device 1 calculates the conversion usage period corresponding to the temperature change in one day, and calculates the estimated life of the lithium ion secondary battery 13.
FIG. 3 is a diagram illustrating a temperature change in an actual installation environment in one day.
In the figure, section A is a section in which the environmental temperature is lower than the standard life specified temperature, and section B is a section in which the environmental temperature is higher than the standard life specified temperature. If standard life regulation temperature = standard temperature, in section A, the battery life is the life at the standard temperature, so the usage time in this section is integrated as it is. On the other hand, the time in the section B is converted as described above in consideration of the temperature.
That is, a certain small time “D” in the section B (for example, 1 hour, 30 minutes, etc.) is considered to be a time at t ° C. that is an average temperature at the time D. Therefore, this time “D” is converted into a usage time (hereinafter referred to as “converted time”) at the standard life specified temperature as D × (Ls / Lt) (time) using (Equation 1).
The above is the temperature change in one day and the correction of the time with respect thereto, and the calculation unit 3 performs such calculation for a period throughout the year. The calculation unit 3 uses the corrected conversion time to estimate the remaining life L (left) of the lithium ion secondary battery 13, that is, the usable period of the lithium ion secondary battery 13 using (Equation 2). Further, the calculation result is displayed on the display unit 4.

  Remaining life L (left) = lifetime period Ls determined by standard life regulation temperature−time of Σ section A−converted time of Σ section B (Expression 2)

  If the annual temperature change in the installation environment can be specified, (Σ section A time) and (Σ section B conversion time) in (Equation 2) above can be calculated with high accuracy, so when used continuously in the same installation environment The remaining lifetime can be calculated easily with high accuracy. The calculation unit 3 uses a temperature sensor of an installation environment (not shown) or obtained from an external device or a recording medium and uses the information on the annual temperature change of the installation environment according to (Equation 2) to obtain a lithium ion secondary battery. The remaining life of 13 is calculated.

Next, calculation of the possessed capacity of the lithium ion secondary battery 13 executed by the calculation unit 3 of the management device 1 will be described.
FIG. 4 is a diagram showing the capacity reduction characteristic data stored in the battery basic data storage unit 2 of the management device 1. In the figure, the relationship between the service life of the lithium ion secondary battery 13 and the battery capacity is shown.
FIG. 5 is a diagram showing the temperature change characteristic data of the storage battery capacity stored in the battery basic data storage unit 2 of the management device 1. In the figure, the relationship between the battery temperature of the lithium ion secondary battery 13 and the battery capacity is shown.
In the calculation of the storage capacity, the calculated value of the service life converted to the standard life regulation temperature (standard temperature) described above, and the capacity deterioration characteristic data built in the battery basic data storage unit 2 (FIG. 4) And the temperature change characteristic data (FIG. 5) of a storage battery capacity are used. That is, when the number of years of use of the lithium ion secondary battery 13 that is an installed storage battery at the standard life specified temperature is n, the number of years of use n is calculated as (time of Σ section A + converted time of Σ section B in Equation 2). ). The computing unit 3 obtains the battery capacity a [Ah] at that time by obtaining the battery capacity a [Ah] corresponding to the service life n using the relationship between the service life and the capacity shown in FIG. .
Next, the calculation unit 3 corrects the previously obtained battery capacity a [Ah] from the temperature measurement value of the installation environment of the lithium ion secondary battery 13 and obtains the “retained capacity” at that time. The correction is performed based on the temperature change characteristic data of the storage battery capacity in FIG. For example, the relationship of temperature 0 ° C .: battery capacity c [Ah],..., Temperature 25 ° C. (standard life specified temperature): battery capacity a [Ah], .., temperature 45 ° C .: battery capacity b [Ah],. When stored as the temperature change characteristic data of the capacity, if the temperature measured by the battery temperature sensor 7 is 45 ° C., the “retained capacity” is b [Ah].

In this way, when the capacity stored in the lithium ion secondary battery 13, that is, the “retained capacity” is obtained, it is possible to estimate the discharge duration when the storage battery discharge is started due to a power failure or the like. The calculation unit 3 performs this calculation by using the actual discharge current measurement value actually measured by the current sensor 6 and dividing the “retained capacity” calculated as described above by the actual discharge current.
6 and 7 are diagrams showing discharge characteristics of the lithium ion secondary battery 13. 6 shows the relationship between the discharge capacity and the terminal voltage, and FIG. 7 shows the relationship between the discharge current and the discharge capacity. In FIG. 6, the discharge current of the lithium ion secondary battery 13 is 0.1 CA, 0.2 CA, 0.3 CA, 1 CA, 3 CA (C is the capacity of the battery) at a charging voltage of 4.1 V and a discharge temperature of 25 ° C. The relationship between the discharge capacity and the terminal voltage in the case of [Ah] is shown. A plot of the relationship between the discharge current and the discharge capacity shown in FIG. 6 is the relationship between the discharge current and the discharge capacity of the lithium ion secondary battery 13 at 25 ° C. shown in FIG. As shown in FIGS. 6 and 7, the discharge characteristics of the lithium ion secondary battery 13 are such that “discharge capacity [Ah]” expressed by “current [A]” × “time [h]” is the discharge current. Regardless, it has the characteristic of almost constant. Accordingly, once the “retained capacity” is obtained, the discharge duration can be calculated by dividing by the discharge current. In the case of a lead-acid battery, as the discharge current increases, the amount of electricity that can be taken out by the discharge decreases. Therefore, the concept of “capacity reduction rate” must be introduced in calculating the discharge duration. However, such a concept is not necessary for the lithium ion secondary battery.

On the other hand, when the discharge from the storage battery is completed and charging is performed, the calculation unit 3 reverses the above-described conversion of the amount of electricity at the time of discharge, based on the amount of electricity at the end of discharge as a current sensor. The charged amount of electricity obtained by multiplying the “charging current” and the “charging time” that are actually measured according to 6 is added.
FIG. 8 is a diagram showing the relationship between the charging voltage of the lithium ion secondary battery 13 and the amount of discharged electricity.
The relationship between the charging voltage of the lithium ion secondary battery 13 and the amount of discharged electricity shown in the figure shows that the charging characteristic of the lithium ion secondary battery is charged as an effective amount of electricity while the charged amount of electricity is almost unchanged, and is used for the next discharge. It is based on the characteristic that it is used (that is, the charging efficiency is almost 100%). The charge ratio of the lithium ion secondary battery 13 displays the ratio of a value obtained by adding the amount of electricity energized by charging, with the “retained capacity” described above being 100%. On the other hand, since the capacity has decreased from the initial value depending on the years of use, the charging ratio may be calculated and displayed with the initial capacity at the time of installation as 100%.

In addition, the management device 1 has a function of monitoring the terminal voltage of the lithium ion secondary battery 13.
FIG. 9 is a diagram showing a state of high voltage detection during sustain charging, and FIG. 10 is a diagram showing a state of discharge end voltage detection during discharge. The terminal voltage monitoring function of the calculation unit 3 constantly monitors the voltage of the lithium ion secondary battery 13 using the battery voltage sensor 8, and during the maintenance charging, the battery voltage is determined to a predetermined value ( (Example: 4.2 to 4.5V) or more, or during discharge, when the voltage falls below a predetermined value (eg, 3.0 to 2.8V), an alarm is generated by the display unit 4 or the like. Information or an alarm transfer to the outside of the remote monitoring device 11 or the like.
When detecting the voltage exceeding the predetermined range as described above, the calculation unit 3 of the management device 1 operates the circuit cutoff switch 12 to stop the charging or discharging of the lithium ion secondary battery 13.

11, 12 and 13 are process flows of a calculation process in the management apparatus 1 using the calculation method described above.
In FIG. 11, when the lithium ion secondary battery 13 is in a standby state, the calculation unit 3 of the management device 1 measures time with a clock provided therein and the lithium ion secondary battery measured by the battery temperature sensor 7. Information on the temperature of the battery 13 is acquired from the interface unit 5 (step S110). The standby state is a state in which power is normally supplied from the commercial power supply 14 or the charger 15 to the load 16 and the lithium ion secondary battery 13 is not charged or discharged. The calculation unit 3 determines the standby state when there is no notification from the power failure detection sensor 9 that a power failure has been detected and the current sensor 6 has not detected a charge / discharge current. The computing unit 3 determines whether there is a temperature abnormality based on the acquired measured temperature information (step S115). This is performed, for example, depending on whether the measured temperature is within a predetermined range. When temperature abnormality is detected (step S115: No), the calculating part 3 outputs the instruction | indication of open | release of the circuit interruption switch 12 (step S120). The circuit cutoff switch 12 receives an instruction from the management device 1 and opens the switch.

  When temperature abnormality is not detected (step S115: Yes), the calculating part 3 acquires the information of the voltage of the lithium ion secondary battery 13 which the battery voltage sensor 8 measured from the interface part 5. FIG. The computing unit 3 determines whether there is a voltage abnormality based on the acquired measurement voltage information (step S125). This is performed, for example, depending on whether or not the measurement voltage is within a predetermined range (see FIG. 9). When a voltage abnormality is detected (step S125: No), the arithmetic unit 3 outputs an instruction to open the circuit cutoff switch 12 (step S130). In response to this instruction, the circuit cutoff switch 12 opens the switch.

  When the voltage abnormality is not detected (step S125: Yes), the calculation unit 3 calculates the remaining capacity (A) of the lithium ion secondary battery 13 and the remaining life using the calculation method described above. (Step S135). Subsequently, in the discharged state, the calculation unit 3 determines whether or not a power failure has occurred (step S140). This is performed depending on whether or not a power failure occurrence information is received from the power failure detection sensor 9 via the interface unit 5. If it is determined that a power failure has not occurred (step S140: No), the management device 1 repeats the processing from step S110 in the standby state.

  On the other hand, when it is determined that a power failure has occurred (step S140: Yes), the calculation unit 3 acquires information on the discharge current of the lithium ion secondary battery 13 measured by the current sensor 6 from the interface unit 5, thereby The discharge current (hereinafter referred to as “storage battery discharge current”) (Id) and the discharge duration (hd) of the ion secondary battery 13 are measured (step S145). Furthermore, the calculating part 3 acquires the information of the measured temperature of the lithium ion secondary battery 13 measured by the battery temperature sensor 7 from the interface part 5, and determines whether there is a temperature abnormality (step S150). When temperature abnormality is detected (step S150: No), the calculating part 3 outputs the instruction | indication of opening of the circuit interruption switch 12 (step S155). If no temperature abnormality is detected (step S150: Yes), the calculation unit 3 acquires information on the voltage of the lithium ion secondary battery 13 measured by the battery voltage sensor 8 from the interface unit 5, and the voltage abnormality is detected. It is determined whether there is any (step S160). When the voltage abnormality is detected (step S160: No), the calculation unit 3 outputs an instruction to open the circuit cutoff switch 12 (step S165).

  When the voltage abnormality is not detected (step S160: Yes), the calculation unit 3 calculates the remaining capacity (B) of the lithium ion secondary battery 13 being discharged and displays the calculation result on the display unit 4 such as a display. (Step S170). The remaining capacity (B) during discharge is calculated by (Equation 3) shown below.

  Remaining capacity during discharge (B) = Calculated value of remaining capacity in standby state (A) − (Measurement value of storage battery discharge current (Id) × Measurement value of discharge duration (hd)) (Equation 3)

  Subsequently, the arithmetic unit 3 determines whether or not the power failure has ended and charging of the storage battery has started in the lithium ion secondary battery 13 (step S175). This is performed by receiving information on the end of the power failure from the power failure detection sensor 9 via the interface unit 5 and whether or not the information indicating that the charging current has been measured is received by the current sensor 6. When the arithmetic unit 3 determines that the power failure has not ended and the storage battery charging has not started in the lithium ion secondary battery 13 (step S175: No), the management device 1 performs the processing from step S145. repeat.

On the other hand, when it is determined that the battery has been charged in the lithium ion secondary battery 13 (step S175: Yes), the battery is charged.
In FIG. 12, the calculation unit 3 obtains information on the charging current measured by the current sensor 6 from the interface unit 5, thereby charging the lithium ion secondary battery 13 (hereinafter referred to as “storage battery charging current”) ( Ic) and elapsed charging time (hc) are measured (step S210).
The computing unit 3 acquires information on the measured temperature of the lithium ion secondary battery 13 measured by the battery temperature sensor 7 from the interface unit 5 and determines whether there is a temperature abnormality (step S215). When a temperature abnormality is detected (step S215: No), the calculation unit 3 outputs an instruction to open the circuit cutoff switch 12 (step S220). If no temperature abnormality is detected (step S215: Yes), the calculation unit 3 acquires information on the voltage of the lithium ion secondary battery 13 measured by the battery voltage sensor 8 from the interface unit 5, and the voltage abnormality is detected. It is determined whether there is any (step S225). When a voltage abnormality is detected (step S225: No), the calculation unit 3 outputs an instruction to open the circuit cutoff switch 12 (step S230).

  When the voltage abnormality is not detected (step S230: Yes), the calculation unit 3 calculates the remaining capacity (C) of the lithium ion secondary battery 13 being charged, and displays the calculation result on the display unit 4 such as a display. (Step S235). The remaining capacity (C) during charging is calculated by the following (Formula 4). However, when passing through a subroutine (FIG. 13) to be described later, it is calculated by (Expression 5) shown below.

  Remaining capacity during charging (C) = Calculated value of remaining capacity in discharged state (B) + (Measurement value of storage battery charging current (Ic) × Measured value of elapsed charging time (hc)) (Equation 4)

  Remaining capacity during charging (C) = Calculated value of remaining capacity in discharged state (D) + (Measurement value of storage battery charging current (Ic) × Measured elapsed time of charging (hc)) (Formula 5)

  Subsequently, in the charged state, the calculation unit 3 determines whether or not a power failure has occurred and the lithium ion secondary battery 13 has been discharged (step S240). This is performed depending on whether or not information on the occurrence of a power failure is received from the power failure detection sensor 9 via the interface unit 5 and information indicating that the discharge current has been measured in the current sensor 6.

  When it is determined that no power failure or discharge has occurred (step S240: No), the calculation unit 3 determines whether or not a discharge electricity amount corresponding to the total discharge electricity amount has been energized (step S245). The total amount of discharged electricity is calculated by integrating (measured battery discharge current measurement value (Id) × discharge duration measurement value (hd)) used in (Equation 3) in step S170 of FIG. The amount of discharged electricity is calculated by integrating (measured battery charge current measurement value (Ic) × charge elapsed time measurement value (hc)) used in (Equation 4) or (Equation 5) in step S235. The When the calculation unit 3 determines that the amount of discharge electricity corresponding to the total amount of discharge electricity is not energized, the calculation unit 3 continues the charge state and repeats the processing from step S210. Further, when it is determined that a discharge electricity amount corresponding to the total discharge electricity amount is energized, a standby state is entered, and the processing from step S110 shown in FIG. 11 is repeated.

  On the other hand, in step S240, when the arithmetic unit 3 determines that a power failure has occurred and the lithium ion secondary battery 13 has been discharged (step S240: Yes), the remaining capacity of the lithium ion secondary battery 13 is stepped. The remaining capacity (C) during charging calculated in S235 is set (step S250), and a subroutine (FIG. 13 to be described later) for calculating the remaining capacity (D) when discharging is performed in the charged state is executed (step 13). S255).

FIG. 13 shows a processing flow in a subroutine for calculating the remaining capacity when discharging is performed in the charged state.
In the figure, the calculation unit 3 obtains information on the discharge current measured by the current sensor 6 from the interface unit 5, whereby the storage battery discharge current (Id) that is the discharge current of the lithium ion secondary battery 13 and the discharge duration time. (Hd) is measured (step S310). Further, information on the measured temperature of the lithium ion secondary battery 13 measured by the battery temperature sensor 7 is acquired from the interface unit 5, and it is determined whether there is a temperature abnormality (step S315). When the temperature abnormality is detected (step S315: No), the calculation unit 3 outputs an instruction to open the circuit cutoff switch 12 (step S320). If no temperature abnormality is detected (step S315: Yes), the calculation unit 3 acquires the voltage information of the lithium ion secondary battery 13 measured by the battery voltage sensor 8 from the interface unit 5, and the voltage abnormality is detected. It is determined whether there is any (step S325). When a voltage abnormality is detected (step S325: No), the calculation unit 3 outputs an instruction to open the circuit cutoff switch 12 (step S330).

  When the voltage abnormality is not detected (step S325: Yes), the calculation unit 3 calculates the remaining capacity (D) of the lithium ion secondary battery 13 being discharged, and displays the calculation result on the display unit 4 such as a display. (Step S335). The remaining capacity (D) during discharge is calculated by the following (formula 6).

  Remaining capacity during discharge (D) = Calculated value of remaining capacity in charged state (C) − (Measurement value of storage battery discharge current (Id) × Measurement value of discharge duration (hd)) (Expression 6)

Subsequently, the calculation unit 3 determines whether or not the power failure has ended and the storage battery charging has started (step S340). When it is determined that the power failure has not ended and the storage battery charging has not started in the lithium ion secondary battery 13 (step S340: No), the processing from step S310 is repeated.
On the other hand, when the power failure ends, the process from step S210 in the charged state shown in FIG. 12 is repeated. However, in step S235 of FIG. 12, the remaining capacity (C) of the lithium ion secondary battery 13 being charged is calculated using (Equation 5) described above, and the calculation result is displayed on the display unit 4 such as a display. Output to.

In addition, although the management apparatus 1 mentioned above is an apparatus which mainly calculated the remaining capacity of a battery, remaining life, etc. about a lithium ion secondary battery, the apparatus which performs charge control of a lithium ion secondary battery, internal resistance, etc. Needless to say, it is not an obstacle to use by combining with a device that performs measurement of the above, etc., and it can be used in common with those devices.
Moreover, in the said embodiment, although the lithium ion secondary battery 13 was set as the assembled battery of the lithium ion secondary battery, one lithium ion secondary battery may be sufficient.

  As described above, the management device 1 measures the temperature of the lithium ion secondary battery 13 to be managed while the commercial power supply or the charger is operating normally, and the lithium ion secondary battery is measured from the measured temperature. The remaining capacity and remaining life of the battery 13 are calculated, and when the storage battery is discharged due to a power failure of the commercial power supply 14 or a failure of the charger 15, the discharge current of the lithium ion secondary battery 13 is measured. When the commercial power source 14 recovers and the lithium ion secondary battery 13 is charged, the charging current to the lithium ion secondary battery 13 is measured and the charging current is calculated. Based on the storage battery capacity calculation.

In addition, the calculation unit 3 of the management device 1 stores the lifetime data at the standard temperature and the relationship data between the temperature and the continuous lifetime in the battery basic data storage unit 2 when calculating the capacity such as the remaining lifetime. For the use period of the lithium ion secondary battery 13 below the standard life specified temperature, the use period is accumulated as it is, and for the period exceeding the standard life specified temperature, the period is converted into the period at the standard life specified temperature. The accumulated lifetime obtained in this way is subtracted from the lifetime in the standard state acquired from the battery basic data storage unit 2 to calculate the remaining lifetime, that is, the usable period. As a method of converting the period used at the standard life specified temperature or more into the period at the standard life specified temperature, the ratio of the life period Lt during continuous use determined by each temperature and the period Ls determined by the standard life specified temperature, Ls / Lt is converted by multiplying the period of use above the standard life specified temperature.
Further, the remaining capacity of the lithium ion secondary battery 13 when the storage battery is discharged is stored in the battery basic data storage unit 2 with time-dependent capacity deterioration characteristic data and storage battery capacity temperature change characteristic data. First, the number of years of use of the lithium ion secondary battery 13 in the standard state is calculated by the above-described method, and the storage battery capacity at the time corresponding to the calculated number of years of use is obtained from the capacity deterioration characteristic data. The acquired storage battery capacity is acquired by converting the storage battery capacity to the capacity at the actually measured temperature using the temperature change characteristic data of the storage battery capacity.
The remaining capacity of the lithium ion secondary battery 13 in which discharge is in progress is obtained by actually measuring the discharge current of the lithium ion secondary battery 13 and subtracting the amount of electricity calculated from the measured value and the discharge duration from the remaining capacity described above. Update with that.
Further, the remaining capacity of the lithium ion secondary battery 13 when the commercial power supply 14 is recovered and charged is the remaining capacity of the lithium ion secondary battery 13 calculated when the commercial power supply 14 is recovered. Calculation is performed by adding the amount of electricity obtained from the product of the actual measured charging current and the charging time.

According to the above embodiment, when a lithium ion secondary battery is used as a backup battery, the remaining years of use, the amount of electricity held, the discharge duration at the time of discharging the storage battery, the charging rate during recovery charging, etc. It is possible to grasp the battery state of the ion secondary battery in total and perform maintenance as necessary, which has a great advantage.
By applying the management device 1 according to the present embodiment to a battery charging device, it is possible to greatly contribute to the improvement of the reliability of the power supply equipment using the lithium ion secondary battery. Can be obtained.

  The above-described management apparatus 1 has a computer system inside. The operation process of the arithmetic unit 3 of the management device 1 described above is stored in a computer-readable recording medium in the form of a program, and the computer system reads and executes this program, so that the above processing is performed. Is called. The computer system here includes an OS and hardware such as peripheral devices.

  In addition to ROM, “computer-readable recording medium” refers to a portable medium such as a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, or a storage device such as a hard disk built in a computer system. That means. Furthermore, the “computer-readable recording medium” refers to a volatile memory (RAM) inside a computer system that becomes a client or a system when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

It is a block diagram which shows the structure of the management apparatus of the lithium ion battery as one embodiment of this invention. It is a figure which shows the relationship data of the temperature and continuous lifetime which concern on one embodiment of this invention. It is a figure for demonstrating the calculation method of the conversion usage period corresponding to the daily temperature change of the actual installation environment which concerns on one embodiment of this invention. It is a figure which shows the capacity | capacitance fall characteristic data based on one embodiment of this invention. It is a figure which shows the temperature change characteristic data of the storage battery capacity which concerns on one embodiment of this invention. It is a figure which shows the relationship between the discharge capacity and terminal voltage of the lithium ion secondary battery which concerns on one embodiment of this invention. It is a figure which shows the relationship between the discharge current and discharge capacity of the lithium ion secondary battery which concerns on one embodiment of this invention. It is a figure which shows the relationship between the charge electricity amount and discharge electricity amount of the lithium ion secondary battery which concerns on one embodiment of this invention. It is a figure which shows the condition of the high voltage detection during the maintenance charge of the lithium ion secondary battery which concerns on one embodiment of this invention. It is a figure which shows the condition of the discharge end voltage detection at the time of discharge of the lithium ion secondary battery which concerns on one embodiment of this invention. It is a figure which shows the flowchart which shows the calculation process in the management apparatus which concerns on one embodiment of this invention. It is a figure which shows the flowchart which shows the calculation process in the management apparatus which concerns on one embodiment of this invention. It is a figure which shows the flowchart which shows the calculation process in the management apparatus which concerns on one embodiment of this invention. It is a figure for demonstrating the charging / discharging reaction mechanism of a lithium ion battery.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Management apparatus, 2 Battery basic data storage part, 3 Computation part, 4 Display part, 5 Interface part, 6 Current sensor, 7 Battery temperature sensor, 8 Battery voltage sensor, 9 Power failure detection sensor 10 Interface part for external output, 11 Remote Monitoring device, 12 Circuit cutoff switch, 13 Lithium ion secondary battery, 14 Commercial power supply, 15 Charger, 16 Load

Claims (8)

Receiving means for receiving information on measured values of current in charge / discharge of a lithium ion secondary battery to be managed, information on measured values of temperature of the lithium ion secondary battery, and information on power supply of commercial power;
The charging / discharging state of the lithium ion secondary battery is determined based on the power feeding information and the current measurement information received via the receiving unit, and in the standby state where charging / discharging is not performed, the reception The remaining capacity and remaining life of the lithium ion secondary battery are calculated based on the measured temperature information received via the means, and in the discharged state, the measured discharge current value received via the receiving means The remaining capacity of the lithium ion secondary battery is calculated based on the information, and in the charged state, the remaining capacity of the lithium ion secondary battery is calculated based on the information on the measured value of the charging current received through the receiving means. Computing means for calculating;
A lithium-ion battery management apparatus comprising: Life time data of lithium ion secondary battery at standard temperature, relational data of temperature and continuous life time that is the life of lithium ion secondary battery at this temperature, over time of lithium ion secondary battery Further comprising battery basic data storage means for storing capacity decrease characteristic data, and temperature change characteristic data of the storage battery capacity indicating the relationship between the temperature of the lithium ion secondary battery and the storage battery capacity,
The computing means is
The continuous life period Ls at the standard temperature and the continuous life period Lt at a temperature exceeding the standard temperature are read from the relationship data between the temperature in the battery basic data storage means and the continuous life period, and the continuous life period Ls Use period conversion to convert the use period at the temperature exceeding the standard temperature into the use period at the standard temperature by multiplying the ratio Ls / Lt with the continuous life period Lt by the use period at the temperature exceeding the standard temperature. Means,
Integration of the use period of the lithium ion secondary battery at a temperature below the standard temperature, and the use period of the lithium ion secondary battery at a temperature exceeding the standard temperature at the standard temperature by the use period conversion means. The usage period in the standard state is calculated by adding the integration of the usage period converted into the usage period, and the calculated usage period in the standard state is calculated from the lifetime in the standard temperature read from the battery basic data storage means. A remaining life calculating means for subtracting and calculating the remaining life;
In the standby state, the storage battery capacity corresponding to the use period in the standard state calculated by the remaining life calculation unit is acquired from the capacity deterioration characteristic data in the battery basic data storage unit, and the acquired storage battery capacity is Referring to the temperature change characteristic data of the storage battery capacity in the battery basic data storage means, a first remaining capacity acquisition means for acquiring the remaining capacity in terms of the storage battery capacity at the temperature of the lithium ion secondary battery;
In the discharge state, the remaining capacity obtained by the first remaining capacity obtaining means is the discharge electric quantity calculated by the product of the measured value of the discharge current obtained from the received information of the measured value of the discharge current and the discharge duration. A second remaining capacity acquisition means for calculating a remaining capacity by subtracting from
In the state of charge, the amount of charge electricity calculated by the product of the measured charge current value and the charge duration obtained from the received measured charge current information is the power failure calculated by the second remaining capacity acquisition means. Comprising a third remaining capacity acquisition means for calculating the remaining capacity by adding to the remaining capacity at the time of recovery,
The lithium ion battery management device according to claim 1. The receiving means further receives information on a measured value of the voltage of the lithium ion secondary battery,
When it is determined that the voltage of the lithium ion secondary battery exceeds a predetermined range according to the information on the measured voltage value received by the receiving unit, the output unit further outputs an alarm.
The lithium ion battery management apparatus according to claim 1, wherein the management apparatus is a lithium ion battery. The receiving means includes
The detection end receives information on the current measurement value from a current sensor connected to the charge / discharge line of the lithium ion secondary battery,
Receives temperature measurement information from a battery temperature sensor connected to the vicinity of the lithium ion secondary battery at the detection end,
Receives information on power supply of commercial power from a power failure detection sensor whose detection end is connected to the power supply line of the commercial power,
Receiving a voltage measurement value information from a voltage sensor having a detection end connected to a terminal of at least one lithium ion secondary battery;
The lithium ion battery management device according to claim 3. A capacity calculation method used for a lithium ion battery management device,
A receiving process for receiving information on measured values of current in charge and discharge of a lithium ion secondary battery to be managed, information on measured values of temperature of the lithium ion secondary battery, and information on power supply of commercial power;
The charging / discharging state of the lithium ion secondary battery is determined based on the received power supply information and current measurement value information, and in the standby state where charging / discharging is not performed, the received temperature measurement value. The remaining capacity and remaining life of the lithium ion secondary battery are calculated based on the information of the battery, and in the discharged state, the remaining capacity of the lithium ion secondary battery is calculated based on the received measurement information of the discharge current. In the charged state, a calculation process for calculating the remaining capacity of the lithium ion secondary battery based on the received measurement information of the charging current,
The capacity | capacitance calculation method of a lithium ion battery characterized by having. The lithium ion battery management device is a life time data of a lithium ion secondary battery at a standard temperature, relational data between a temperature and a continuous life time that is a life when a lithium ion secondary battery is continuously used at this temperature, Battery basic data storage means for storing capacity deterioration characteristic data over time of the lithium ion secondary battery, and temperature change characteristic data of the storage battery capacity indicating the relationship between the temperature of the lithium ion secondary battery and the storage battery capacity,
The calculation process is as follows:
The continuous life period Ls at the standard temperature and the continuous life period Lt at a temperature exceeding the standard temperature are read from the relationship data between the temperature in the battery basic data storage means and the continuous life period, and the continuous life period Ls Use period conversion to convert the use period at the temperature exceeding the standard temperature into the use period at the standard temperature by multiplying the ratio Ls / Lt with the continuous life period Lt by the use period at the temperature exceeding the standard temperature. Process,
Integration of the use period of the lithium ion secondary battery at a temperature below the standard temperature and the use period of the lithium ion secondary battery at a temperature exceeding the standard temperature at the standard temperature by the use period conversion process. The usage period in the standard state is calculated by adding the integration of the usage period converted into the usage period, and the calculated usage period in the standard state is calculated from the lifetime in the standard temperature read from the battery basic data storage means. A remaining life calculation process of subtracting and calculating the remaining life;
In the standby state, the storage battery capacity corresponding to the use period in the standard state calculated in the remaining life calculation process is acquired from the capacity deterioration characteristic data in the battery basic data storage means, and the acquired storage battery capacity is Referring to the temperature change characteristic data of the storage battery capacity in the battery basic data storage means, a first remaining capacity acquisition process of acquiring the remaining capacity in terms of the storage battery capacity at the temperature of the lithium ion secondary battery;
In the discharge state, the remaining capacity obtained by the first remaining capacity obtaining process is obtained by calculating the discharge electric quantity calculated by the product of the measured value of the discharge current obtained from the received information of the measured value of the discharge current and the discharge duration. A second remaining capacity acquisition process for calculating the remaining capacity by subtracting from
In the state of charge, the amount of charge electricity calculated by the product of the measurement value of the charge current and the charge duration obtained from the information of the measurement value of the received charge current is the power failure calculated by the second remaining capacity acquisition process. Comprising a third remaining capacity acquisition process for calculating the remaining capacity by adding to the remaining capacity at the time of recovery.
The capacity calculation method for a lithium ion battery according to claim 5. In the reception process, further, information on the measured value of the voltage of the lithium ion secondary battery is received,
When it is determined that the voltage of the lithium ion secondary battery exceeds a predetermined range according to the information on the measured value of the received voltage, it further includes an output process of outputting an alarm.
The capacity | capacitance calculation method of the lithium ion battery of any one of Claim 5 or Claim 6 characterized by the above-mentioned. A computer program used in a lithium ion battery management device,
A reception step of receiving information on measured values of current in charge / discharge of a lithium ion secondary battery to be managed, information on measured values of temperature of the lithium ion secondary battery, and information on power supply of a commercial power source;
The charging / discharging state of the lithium ion secondary battery is determined based on the received power supply information and the current measurement value information, and in the standby state where charging / discharging is not performed, the received temperature measurement value information. The remaining capacity and remaining life of the lithium ion secondary battery are calculated based on the discharge state, and in the discharged state, the remaining capacity of the lithium ion secondary battery is calculated based on the information of the measured value of the discharge current, and the charged state In the calculation step of calculating the remaining capacity of the lithium ion secondary battery based on the received measurement information of the charging current,
A computer program for causing a computer to execute.

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