JP5330355B2 - Uninterruptible power supply, power processing method and power processing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a thermal runaway of a secondary battery including the one due to a manufacturing failure, and to prevent deterioration in reliability and operability of system as well. <P>SOLUTION: An uninterruptible power supply device comprises: a secondary battery for becoming a power supply to connected apparatuses in the case of a blackout of the input power supply; measuring means to measure the temperature of the secondary battery; and charging stop means for calculating a temperature variation rate which is a change of the measured temperature per unit time. Also, the charging stop means determines whether or not the temperature variation rate is above the thermal runaway determination value, which is the value to determine whether or not a thermal runaway is generated, and if the temperature variation rate is above the thermal runaway determination value, the means stops supplying charging current to the secondary battery. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to an uninterruptible power supply, a power processing method, and a power processing program.

  Various means are considered in order to improve the reliability and operability of electronic devices including computers, communication devices including information processing systems, hubs and routers, and network systems. One of the means that has a remarkable effect is an uninterruptible power supply. Since power supply is indispensable for the operation of equipment and systems, the uninterruptible power supply greatly contributes to the improvement of the reliability and operability of equipment and systems.

  Since the uninterruptible power supply has a battery, the power stored in the battery can be supplied to the electronic device even when the input AC power supply fails. Therefore, when the power failure time is short, the uninterruptible power supply can supply power to the electronic device until the power failure is restored. On the other hand, when the power failure time is long, the uninterruptible power supply can be stopped (shut down) in a state where the operation of the electronic device can be resumed in consideration of the amount of power of the battery.

  As a battery for an uninterruptible power supply, demands for maintenance-free, miniaturization, and cost reduction are increasing, and therefore, a control valve type lead storage battery is widely used.

  The control valve type lead-acid battery is a secondary battery that uses lead dioxide for the positive electrode plate, sponge-like lead for the negative electrode plate, and dilute sulfuric acid for the electrolyte. The control valve type lead-acid battery is charged by sulfate ions moving from both the positive electrode and the negative electrode into the electrolyte solution, and discharged by moving sulfate ions in the electrolyte solution to both the positive electrode and the negative electrode.

  When a control valve type lead acid battery is charged, the temperature of the battery and its surroundings increases, thereby increasing the charging current. This occurs due to a synergistic effect of the increase in oxygen generation amount at the positive electrode due to the decomposition of the electrolyte when charged and the increase in the oxygen absorption reaction rate at the negative electrode as the sealing reaction efficiency is improved. . When the generation rate of Joule heat accompanying the increase in the reaction heat and the charging current becomes larger than the thermal diffusion rate of the battery, the battery temperature rises above the ambient temperature. A vicious cycle occurs in which the battery temperature further rises and the charging current increases.

  This is a phenomenon called “heat escape”. When thermal runaway occurs, the internal temperature and internal pressure of the battery rises, and the valve is opened by the safety valve function of the battery, and the gas is released by the valve opening. As a result, the electrolyte is reduced, resulting in an abnormal increase in internal resistance. Charging current decreases. As a result, the heat escape converges. When the thermal runaway occurs, there is a problem that the battery holding time is lost, battery performance is lost, smoke is generated from the battery, and the battery case is thermally deformed.

  For example, Patent Document 1 describes a means for preventing thermal escape. Patent Document 1 describes that the gas generation amount of the positive electrode during the float charging is reduced by increasing the hydrogen overvoltage of the negative electrode plate, and further, the sustainability of the effect is increased, thereby preventing the battery from running away. Describe.

  Further, Patent Document 2 discloses a power supply device that can prevent deterioration of a secondary battery due to always performing partial charge / discharge and can be maintained with reliability.

  Patent Document 3 discloses an uninterruptible power supply device having a secondary battery charging device that suppresses deterioration of a secondary battery due to charging at a high temperature and controls charging current in accordance with the surrounding environment to perform charging. Describe.

  Patent Document 4 describes that a battery group including a plurality of batteries connected in parallel is incorporated into an uninterruptible power supply device, and charging / discharging is repeated to quickly and reliably detect a battery in which an abnormality has occurred.

  By the way, the battery is usually configured by connecting a plurality of 2 [V] cells (single cells) in series. For example, a 12 [V] battery in which 6 cells are connected in series, a 24 [V] battery in which 12 cells are connected in series, or the like is used.

  The cell includes a positive electrode plate, a negative electrode plate, and a separator. In the cell, a manufacturing defect such as a mechanical defect (burr or distortion) of the electrode grid or contamination of foreign matter occurs with a certain probability in manufacturing. A cell having such a defect may have a short-circuit between electrodes due to penetration of the separator while it is used for a long time. As a result, a normal cell enters an overvoltage state.

  As a result, an increase in charging current, an increase in Joule heat, an increase in the chemical reaction rate of the electrode portion due to a temperature rise, and a vicious cycle, that is, a thermal escape, occurs in which an increase in charge current and an increase in Joule heat occur.

JP 2002-117856 A JP 2003-018761 A JP 2006-203978 A JP-A-4-281339

  In the thermal runaway prevention means described in Patent Document 1, there is a problem that thermal runaway due to the above cause cannot be prevented even if the risk of thermal runaway can be suppressed.

  Patent Document 2 describes that in a charging mode performed whenever the battery capacity decreases, charging is stopped before full charging to prevent the secondary battery from being deteriorated. Preventing thermal runaway that occurs during operation of the device is not described.

  Patent Document 3 describes that when the secondary battery is above a certain temperature, it is determined that the deterioration due to charging is large and the charging is stopped. However, the heat generated during the operation of the uninterruptible power supply is described. Prevention of runaway is not described.

  Patent Document 4 discloses that a battery abnormality is detected because the maximum charging current in the battery exceeds a predetermined value or the difference between the maximum charging current and the minimum charging current exceeds a predetermined value. Although described, it does not describe preventing thermal runaway that occurs during operation of the uninterruptible power supply.

  The present invention has been made in view of the above problems, and prevents thermal runaway of secondary batteries including those caused by manufacturing defects, and prevents deterioration of system reliability and operability due to thermal runaway. The main object is to provide an uninterruptible power supply, a power processing method, and a power processing program.

The uninterruptible power supply in the present invention is a secondary battery serving as a power source for the connected equipment upon a power failure of the input power supply, a measuring means for measuring the temperature of the secondary battery, the measured temperature, When the measured temperature is equal to or higher than the first reference temperature, which is a temperature at which it is determined that no thermal escape has occurred, a change in the measured temperature per unit time And calculating whether the temperature change rate is equal to or higher than a thermal escape determination value, which is a determination value of whether or not thermal escape has occurred, and determining whether the temperature change rate is thermal escape If the value is equal to or greater than the value, the charging current supply to the secondary battery is stopped, and if the measured temperature is lower than the first reference temperature, the temperature change rate is not calculated and the charging current supply is not stopped. Stop means.

The uninterruptible power supply method according to the present invention measures the temperature of a secondary battery serving as a power supply source to connected equipment when a power failure occurs at an input power source, and the measured temperature and thermal escape occur. When the measured temperature is equal to or higher than the first reference temperature, a change in the measured temperature per unit time is detected by the charging stop means. While calculating a certain temperature change rate, it is determined whether the temperature change rate is equal to or greater than a thermal escape determination value that is a determination value of whether or not thermal escape has occurred, and the temperature change rate is a thermal escape determination value If it is above, supply of the charging current to the secondary battery is stopped, and if the measured temperature is lower than the first reference temperature, the temperature change rate is not calculated and the supply of the charging current is stopped. Not .

  This object is also achieved by an uninterruptible power supply device having the above-described configurations and a power supply processing method by a computer program that is realized by a computer and a computer-readable storage medium that stores the computer program. Is done.

  According to this invention, while preventing the thermal runaway of the secondary battery including what originates in manufacture defect, the effect which can prevent the reliability of a system and the fall of operability by thermal runaway is acquired.

It is a block diagram which shows the structure of the uninterruptible power supply which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the uninterruptible power supply which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the uninterruptible power supply which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the uninterruptible power supply which concerns on the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the uninterruptible power supply which concerns on the 4th Embodiment of this invention. It is a block diagram which shows the structure of the uninterruptible power supply which concerns on the 5th Embodiment of this invention. It is a flowchart which shows operation | movement of the uninterruptible power supply which concerns on the 5th Embodiment of this invention.

First Embodiment Next, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an uninterruptible power supply 100 according to the first embodiment of the present invention. As shown in FIG. 1, the uninterruptible power supply device 100 includes a secondary battery 101, a measurement unit 102, and a charge stop unit 103.

  The secondary battery 101 serves as a power supply source for connected devices in the event of a power failure of the input power supply. The measuring unit 102 measures the temperature of the secondary battery. The charging stop unit 103 calculates a temperature change rate that is a change per unit time of the measured temperature, and the temperature change rate is equal to or higher than a thermal escape determination value that is a determination value as to whether or not a thermal escape has occurred. If the temperature change rate is equal to or greater than the thermal escape determination value, the supply of the charging current to the secondary battery 101 is stopped.

  The secondary battery 101 corresponds to the battery of each embodiment described below, and the input power source corresponds to an input terminal and a converter, such as a commercial power source. In addition, the measurement unit 102 corresponds to a thermistor, a battery temperature detector, and an A / D (Analog / Digital) converter, and the charge stop unit 103 also corresponds to a switch, a processor, and a switch opening / closing drive unit.

  As described above, according to the first embodiment, since the uninterruptible power supply 100 has the above-described configuration, it prevents thermal escape of secondary batteries including those caused by manufacturing defects, and also due to thermal escape. An effect of preventing deterioration of system reliability and operability can be obtained.

Second Embodiment FIG. 2 is a block diagram showing a configuration of an uninterruptible power supply 10 according to a second embodiment of the present invention. As shown in FIG. 2, the uninterruptible power supply 10 includes a converter 11, an inverter 12, a switch 13, a battery 14, a thermistor 15, a battery temperature detector 16, a control unit 17, an input terminal A, and an output terminal B.

  The control unit 17 includes an A / D converter 21, a switch opening / closing drive unit 22, a battery abnormality notification unit 23, a processor 24, and a storage unit 25.

  As shown in FIG. 2, the converter 11 is connected to the input terminal A. Converter 11 and inverter 12 are connected to each other. The inverter 12 is connected to the output terminal B.

  The input terminal A receives AC power from an input power source (not shown) such as a commercial power source. Converter 11 converts the AC power input from input terminal A into DC power. The inverter 12 converts the DC power output from the converter 11 into predetermined AC power. The output terminal B supplies the AC power output from the inverter 12 to a connected load device (not shown).

  A switch 13 and a battery 14 are connected between the converter 11 and the inverter 12. The switch 13 connects or disconnects the battery 14 to and from the converter 11 and the inverter 12. The thermistor 15 measures the surface temperature or ambient temperature of the battery 14 (hereinafter referred to as the battery temperature). The battery temperature detector 16 acquires data measured by the thermistor 15. The control unit 17 acquires data from the battery temperature detector 16.

  The battery 14 inputs the DC power output from the converter 11 via the switch 13. The battery 14 is charged by this direct current. The thermistor 15 measures the battery temperature, and the battery temperature detector 16 calculates a voltage value Vbt corresponding to the battery temperature acquired from the thermistor 15 and supplies it to the controller 17.

  The storage unit 25 of the control unit 17 is a non-volatile storage device (storage medium) such as a readable / writable temporary memory or a hard disk device that holds a computer (software) program (hereinafter referred to as a program), data, and the like. is there. The storage unit 25 retains the contents even when the uninterruptible power supply 10 is powered off. The storage unit 25 can be realized by, for example, a RAM (Random Access Memory) backed up by a ROM (Read Only Memory), a flash memory, a battery, or the like. However, setting information and data are stored in storage means other than ROM.

  The programs stored in the storage unit 25 include a program for executing thermal escape detection and a battery 14 protection operation, which will be described later, and a program for executing other known uninterruptible power supply 10 operations.

  The A / D converter 21 converts the voltage value Vbt, which is analog data acquired from the battery temperature detector 16, into the battery temperature Tb, which is digital data, and supplies the battery temperature Tb to the processor 24.

  The processor 24 controls the operation of the control unit 17 by reading out and executing the program from the storage unit 25. In this embodiment and other embodiments, the processor 24 executes a program for each function (each unit) included in the control unit 17 while referring to the storage unit 25 as appropriate.

  Specifically, the processor 24 executes programs of the switch opening / closing drive unit 22 and the battery abnormality notification unit 23 included in the control unit 17 while referring to the storage unit 25 as appropriate.

  When the processor 24 detects thermal escape as a result of the execution of the program, the processor 24 notifies the switch opening / closing drive unit 22 and the battery abnormality notification unit 23 of information (thermal escape information) including the occurrence of thermal escape.

  When the switch opening / closing drive unit 22 acquires the heat escape information from the processor 24, the switch opening / closing drive unit 22 changes the switch 13 from the “closed” state to the “open” state. That is, the switch opening / closing drive unit 22 stops charging the battery 14 by disconnecting the battery 14 from the converter 11. Note that the switch 13 is normally in a “closed” state.

  When the battery abnormality notification unit 23 acquires the thermal runaway information of the processor 24, the battery abnormality notification unit 23 turns on an abnormality lamp (not shown) that notifies the battery abnormality, sounds a buzzer (not shown) that notifies the battery abnormality, To a load device (not shown) or a monitoring device (not shown). Thereby, the uninterruptible power supply 10 notifies the administrator or the like that an abnormality has occurred in the battery.

  Although the uninterruptible power supply 10 shown in FIG. 2 does not describe a charging circuit, it is desirable to include a known charging circuit that keeps the charging voltage stable or prevents overcharging.

  At constant time, the uninterruptible power supply 10 converts AC power from an input power source such as a commercial power source obtained via the input terminal A into predetermined DC power by the converter 11. The storage direct current energy generated by the converter 11 is supplied to the battery 14 via the switch 13. Thereby, the battery 14 is charged. The DC energy for storage is also input to the inverter 12 and is converted again into a predetermined AC by the inverter 12. This AC power is supplied to a load device (not shown) via the output terminal B.

  When a power failure occurs, that is, when the AC power input to the input terminal A stops, the predetermined DC power output from the converter 11 is interrupted. Then, DC power is supplied from the battery 14 to the inverter 12. The inverter 12 converts the DC power acquired from the battery 14 into predetermined AC power and supplies it to the load device via the output terminal B. As a result, the uninterruptible power supply 10 supplies AC power of a predetermined output to the load device via the output terminal B for a predetermined time (hereinafter referred to as “battery holding time”) even when a power failure occurs. it can.

  When the power failure is recovered (recovered), the uninterruptible power supply 10 converts AC power from an input power source such as a commercial power source obtained via the input terminal A into predetermined DC power by the converter 11. The generated direct current energy for storage is supplied to the battery 14 via the switch 13. Thereby, the battery 14 is charged.

  FIG. 3 is a flowchart showing the operation of the uninterruptible power supply 10. With reference to FIG. 3, detection of thermal escape of battery 14 of uninterruptible power supply 10 and protection operation of battery 14 will be described.

  During the operation of the uninterruptible power supply 10, the thermistor 15 always measures the battery temperature of the battery 14 and supplies the measured value to the battery temperature detector 16. The battery temperature detector 16 converts the acquired battery temperature into a corresponding voltage value Vbt. Then, the battery temperature detector 16 supplies the voltage value Vbt to the A / D converter 21.

  The A / D converter 21 converts the voltage value Vbt, which is analog data acquired from the battery temperature detector 16, into the battery temperature Tb, which is digital data, and supplies the battery temperature Tb to the processor 24.

  The processor 24 acquires the battery temperature Tb from the A / D converter 21 (step S201). For example, the processor 24 may sample the battery temperature Tb five times at one-second intervals, round down the maximum value and the minimum value, and set the average of three values as the battery temperature Tb.

  Subsequently, the processor 24 starts a built-in timer (not shown) and measures one minute (step S202). When one minute has elapsed, the processor 24 obtains the battery temperature Tb again by the same procedure as in step S201 (step S203). Based on the acquired battery temperature Tb, the processor 24 calculates a battery temperature change rate dTb / dt with a unit time of 1 minute according to the following (Equation 1) (step S204).

(Formula 1) dTb / dt = (current temperature) − (temperature one minute before)
Here, the battery temperature change rate means an increase rate of the battery temperature. Subsequently, the processor 24 determines whether or not the battery temperature change rate dTb / dt of the battery 14 is greater than or equal to the thermal escape determination value A (or greater than the thermal escape determination value A) (step S205). Here, the thermal escape determination value A is a determination value for determining whether or not thermal escape has occurred. The size (capacity) of the battery 14 of the uninterruptible power supply 10 and the number of batteries used in combination. The optimum value is determined in advance based on the arrangement method or the like.

  If the battery temperature change rate dTb / dt of the battery 14 is smaller than the thermal escape determination value A (or less than or equal to the thermal escape determination value A), the processor 24 determines that no thermal escape has occurred and performs the processing step. Return to S202.

  On the other hand, when the processor 24 determines in step S205 that the battery temperature change rate dTb / dt of the battery 14 is equal to or greater than the thermal escape determination value A (or greater than the thermal escape determination value A), the processor 24 determines that thermal escape has occurred. At the same time, the battery release flag is turned on (step S206). The battery release flag is a flag held inside the processor 24.

  When the battery release flag is turned on, the processor 24 instructs the switch opening / closing drive unit 22 to turn off (opens) the switch 13, and the battery abnormality notification unit 23 has caused thermal escape to the battery. Supply heat escape information including information indicating that.

  The switch opening / closing drive unit 22 turns off (opens) the switch 13 in response to the instruction. Thereby, since the battery 14 is disconnected from the converter 11, the charging of the battery 14 is stopped. Therefore, the thermal escape generated due to the rise in battery temperature tends to converge.

  In addition, the battery abnormality notification unit 23 responds to the heat escape information from the processor 24, turns on an abnormality lamp that informs the battery abnormality, sounds a buzzer that informs the battery abnormality, or detects a battery abnormality in a load device or a monitoring device. Notify the battery abnormality. Thereby, the uninterruptible power supply 10 can notify an administrator or the like that an abnormality has occurred in the battery.

  As described above, according to the second embodiment, the thermistor 15 measures the temperature of the battery 14 of the uninterruptible power supply 10, and the processor 24 calculates the battery temperature change rate dTb / dt based on the measured value. When the battery temperature change rate dTb / dt is equal to or greater than the thermal escape determination value, the switch opening / closing drive unit 22 sets the switch 13 to “open”. Thereby, since the battery 14 is disconnected from the converter 11, the rise in the battery temperature of the battery 14 can be stopped and the thermal escape can be converged. Therefore, it is possible to prevent the secondary battery including the one caused by the manufacturing failure from being thermally runaway and to prevent the system reliability and operability from being lowered due to the thermal runaway.

3rd Embodiment FIG. 4: is a flowchart which shows operation | movement of the uninterruptible power supply 10 which concerns on the 3rd Embodiment of this invention. A third embodiment of the present invention will be described with reference to FIG.

  The operation of the uninterruptible power supply 10 shown in FIG. 4 further includes steps S302 and S305 in addition to the operation shown in FIG. 3 described in the second embodiment. The battery temperature that can lead to thermal escape is generally 40 ° C. to 50 ° C. or more, depending on the type of battery. For this reason, in step S302, the processor 24 determines whether or not the battery temperature Tb measured in step S301 is 40 ° C. or higher. If not, the processor 24 determines that no thermal escape has occurred, and the battery Steps S303 to S308, which are temperature monitoring operations, are not executed. Thereby, the load of the processor 24 can be reduced.

  In general, when the battery temperature is 70 ° C. or higher, it is considered that thermal escape has occurred. For this reason, in step S305, the processor 24 determines whether or not the battery temperature Tb measured in step S304 is 70 ° C. or higher. If the battery temperature Tb is 70 ° C. or higher, the processor 24 determines that thermal escape has occurred. . Then, the processor 24 releases the battery in step S308 without performing the temperature increase rate checking operation in steps S306 and S307. Note that the determination temperatures in step S302 and step S305 may be appropriately selected and changed.

  As described above, according to the third embodiment, the processor 24 of the uninterruptible power supply 10 has a battery temperature lower than the first reference value that is a temperature at which it is determined that no thermal runaway has occurred. In this case, the battery temperature monitoring operation and the battery releasing operation are not performed. On the other hand, when the battery temperature is equal to or higher than the second reference value that is a temperature at which it is determined that the thermal runaway has occurred, the processor 24 releases the battery without performing the battery temperature increase rate checking operation. . Thereby, the effect that the load of the processor 24 can be reduced is obtained.

4th Embodiment FIG. 5: is a block diagram which shows the structure of the uninterruptible power supply 30 which concerns on the 4th Embodiment of this invention. As shown in FIG. 5, the uninterruptible power supply 30 includes a converter 11, an inverter 12, an input terminal A, and an output terminal B, as in the second embodiment.

  Moreover, in this embodiment, the switch 13, the battery 14, the thermistor 15, the battery temperature detector 16, and the A / D converter 21 of the uninterruptible power supply apparatus 10 demonstrated in 2nd Embodiment are provided 3 each.

  Specifically, the uninterruptible power supply 30 includes switches 13a, 13b, and 13c connected between the converter 11 and the inverter 12. Moreover, the battery containers 18a, 18b, and 18c connected to the switches 13a, 13b, and 13c are provided.

  The battery container 18a houses the battery 14a, the thermistor 15a, and the battery temperature detector 16a. Similarly, the battery container 18b houses the battery 14b, the thermistor 15b, and the battery temperature detector 16b, and the battery container 18c houses the battery 14c, the thermistor 15c, and the battery temperature detector 16c.

  The control unit 17a includes A / D converters 21a, 21b, and 21c, a processor 24a, a switch opening / closing drive unit 22a, a battery abnormality notification unit 23a, and a storage unit 25a.

  It is described that the uninterruptible power supply 30 includes three battery containers and three batteries, thermistors, and battery temperature detectors therein, but may include two or four or more. Moreover, the uninterruptible power supply 30 may be provided with a battery container inside or outside.

  Each of the above components performs an operation similar to the operation described in the second embodiment. The processor 24a acquires the battery temperature Tb from the A / D converters 21a, 21b, and 21c, and determines whether or not thermal escape has occurred as in the second embodiment. If the processor 24a determines that thermal escape has occurred in any of the batteries 14a, 14b, 14c, the processor 24a notifies the switch open / close drive unit 22a of the battery in which thermal escape has occurred.

  The switch opening / closing drive unit 22a turns off (opens) only the switch connected to the notified battery. That is, the switch opening / closing drive unit 22a stops charging the battery by disconnecting only the battery in which thermal escape has occurred from the converter 11. Thereby, the uninterruptible power supply 30 can stop the charging of only the battery in which the thermal escape has occurred and can continue to use the battery in which the thermal escape has not occurred. You can drive continuously.

  As described above, according to the fourth embodiment, the uninterruptible power supply 30 includes a plurality of batteries, and the switch opening / closing drive unit 22a only charges a battery in which a thermal runaway occurs among the plurality of batteries. Stop. With this configuration, since the use of the battery in which no thermal escape has occurred can be continued, in addition to the effect described in the second embodiment, the effect of being able to operate continuously is obtained.

Fifth Embodiment FIG. 6 is a block diagram showing a configuration of an uninterruptible power supply 40 according to a fifth embodiment of the present invention. As shown in FIG. 6, the uninterruptible power supply 40 includes a thermistor 41, an ambient temperature detector 42, and an A / D converter 43 in addition to the components of the uninterruptible power supply 10 shown in the second embodiment. . The uninterruptible power supply 40 is a type of device that can be carried outdoors.

  The thermistor 41 measures the ambient temperature of the uninterruptible power supply 40. The ambient temperature is the temperature of the environment where the uninterruptible power supply 40 is installed, and is a temperature that is not affected by the temperature change of the battery 14. The ambient temperature detector 42 acquires the ambient temperature measured by the thermistor 41 and calculates a voltage value Vat corresponding to the ambient temperature. The ambient temperature detector 42 supplies the voltage value Vat to the A / D converter 43. The A / D converter 43 converts the voltage value Vat, which is analog data acquired from the ambient temperature detector 42, into the ambient temperature Ta, which is digital data, and supplies the ambient temperature Ta to the processor 24b.

  The processor 24b determines whether or not thermal escape has occurred based on the ambient temperature Ta and the battery temperature Tb acquired from the A / D converter 43 and the A / D converter 21.

  FIG. 7 is a flowchart showing the operation of the uninterruptible power supply 40 according to the fifth embodiment of the present invention. With reference to FIG. 7, the operation of the uninterruptible power supply 40 according to the fifth embodiment of the present invention will be described.

  During operation of the uninterruptible power supply 40, the thermistor 15 constantly measures the battery temperature of the battery 14 and supplies the measured value to the battery temperature detector 16. The thermistor 41 measures the ambient temperature of the environment where the uninterruptible power supply 40 is installed, and supplies the measured value to the ambient temperature detector 42.

  The processor 24b acquires the ambient temperature Ta through the A / D converter 43 and also acquires the battery temperature Tb through the A / D converter 21 (step S401).

  Subsequently, the processor 24b starts a built-in timer, measures one minute (step S402), and once again passes, acquires the ambient temperature Ta and the battery temperature Tb (step S403). Subsequently, the processor 24b calculates a temperature difference between the acquired battery temperature Tb and the ambient temperature Ta (step S404).

  Subsequently, based on the calculated temperature difference, the processor 24b calculates a temperature difference change rate dT / dt with a unit time of 1 minute according to the following (Equation 2) (step S405).

(Formula 2) dT / dt = (current temperature difference) − (temperature difference one minute ago)
Here, the temperature difference change rate means an increase rate of the temperature difference. Subsequently, the processor 24b determines whether or not the temperature difference change rate dT / dt of the battery 14 is greater than or equal to the thermal escape determination value B (or greater than the thermal escape determination value B) (step S406). Here, the thermal escape determination value B is a determination value for determining whether or not thermal escape has occurred, and the size (capacity) of the battery 14 of the uninterruptible power supply 40 and the number of batteries used in combination. The optimum value is determined in advance based on the arrangement method or the installation environment of the uninterruptible power supply 40.

  If the temperature difference change rate dT / dt is smaller than the thermal escape determination value B (or less than or equal to the thermal escape determination value B), the processor 24b determines that no thermal escape has occurred, and returns the process to step S402.

  On the other hand, when the processor 24b determines that the temperature difference change rate dT / dt is equal to or greater than the thermal escape determination value B (or greater than the thermal escape determination value B), the processor 24b determines that the thermal escape has occurred and also sets the battery release flag. Is turned on (step S407).

  After turning on the battery release flag, the processor 24b performs the same operation as that described in the second embodiment.

  As described above, according to the fifth embodiment, the thermistors 15 and 41 measure the temperature of the battery 14 and the ambient temperature, respectively, and the processor 24b uses the temperature difference change rate dT based on the temperature difference between the battery temperature and the ambient temperature. / Dt is calculated. When the temperature difference change rate dT / dt is equal to or greater than the thermal escape determination value, the switch opening / closing drive unit 22 sets the switch 13 to “open”. Thereby, in addition to the effect described in 2nd Embodiment, the effect that the misdetection of the thermal runaway by the fluctuation | variation of the ambient temperature of the environment where the uninterruptible power supply 40 is installed can be prevented is acquired.

  The present invention can be applied to a device including a secondary battery in addition to an uninterruptible power supply device, for example.

A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.
(Appendix 1)
In the event of a power failure of the input power supply, a secondary battery that serves as a power source for the connected equipment,
Measuring means for measuring the temperature of the secondary battery;
While calculating a temperature change rate that is a change per unit time of the measured temperature, whether the temperature change rate is greater than or equal to a thermal escape determination value that is a determination value of whether or not thermal escape has occurred And when the temperature change rate is equal to or greater than the thermal runaway determination value, an uninterruptible power supply comprising: a charge stopping means for stopping supply of a charging current to the secondary battery.
(Appendix 2)
The charging stop means compares the measured temperature with a first reference temperature that is a temperature at which it is determined that no thermal escape has occurred, and the measured temperature is less than the first reference temperature. If not, the uninterruptible power supply according to appendix 1, wherein the temperature change rate is not calculated and the supply of the charging current is not stopped.
(Appendix 3)
The charging stop means compares the measured temperature with a second reference temperature that is a temperature at which thermal escape is determined to occur, and the measured temperature is equal to or higher than the second reference temperature. If not, the uninterruptible power supply according to appendix 1 or 2, wherein the supply of the charging current is stopped without calculating the temperature change rate.
(Appendix 4)
A plurality of the secondary batteries;
The measuring means for measuring the temperature of each secondary battery,
The charging stop means only supplies a charging current to a secondary battery in which a temperature change rate equal to or higher than the thermal escape determination value is detected among the measured temperature change rates calculated from the secondary batteries. The uninterruptible power supply according to any one of appendices 1 to 3, which is stopped.
(Appendix 5)
It further comprises ambient temperature measuring means for measuring the ambient temperature of the environment where the device is installed,
The charging stop means calculates a temperature difference change rate that is a change per unit time of a temperature difference between the ambient temperature and the temperature of the secondary battery, and the temperature difference change rate is equal to or greater than the thermal escape determination value. In this case, the uninterruptible power supply according to any one of appendices 1 to 4, wherein supply of a charging current to the secondary battery is stopped.
(Appendix 6)
The charging stop means includes a switch for connecting the input power source and the secondary battery, and when the supply of the charging current is stopped, the input power source and the secondary battery are separated by the switch. The uninterruptible power supply according to any one of 5.
(Appendix 7)
In the event of a power failure of the input power supply, measure the temperature of the secondary battery that is the power source for the connected equipment,
While calculating a temperature change rate that is a change per unit time of the measured temperature, whether the temperature change rate is greater than or equal to a thermal escape determination value that is a determination value of whether or not thermal escape has occurred And when the rate of temperature change is equal to or greater than the thermal escape determination value, the power supply processing method of stopping the supply of the charging current to the secondary battery.
(Appendix 8)
After the temperature of the secondary battery is measured, the measured temperature is compared with a first reference temperature that is a temperature at which it is determined that no thermal escape has occurred, and the measured temperature is The power supply processing method according to appendix 7, wherein when the temperature is lower than the first reference temperature, the temperature change rate is not calculated and the supply of the charging current is not stopped.
(Appendix 9)
After the temperature of the secondary battery is measured, the measured temperature is compared with a second reference temperature, which is a temperature at which it is determined that thermal escape has occurred, and the measured temperature is The power supply processing method according to appendix 7 or 8, wherein when the temperature is equal to or higher than the second reference temperature, the supply of the charging current is stopped without calculating the temperature change rate.
(Appendix 10)
When stopping the supply of the charging current, among the measured temperature change rates calculated from the plurality of secondary batteries, to the secondary battery in which a temperature change rate equal to or higher than the thermal escape determination value is detected. The power supply processing method according to any one of appendices 7 to 9, wherein only supply of the charging current is stopped.
(Appendix 11)
Measure the ambient temperature of the environment where the device is installed,
When the supply of the charging current is stopped, a temperature difference change rate that is a change per unit time of a temperature difference between the ambient temperature and the temperature of the secondary battery is calculated, and the temperature difference change rate is calculated as the thermal escape rate. 11. The power supply processing method according to any one of appendices 7 to 10, wherein supply of a charging current to the secondary battery is stopped when the determination value is equal to or greater than a determination value.
(Appendix 12)
The power supply processing method according to any one of appendices 7 to 11, wherein when the supply of the charging current is stopped, the input power supply and the secondary battery are disconnected by a switch that connects the input power supply and the secondary battery.
(Appendix 13)
In the event of a power failure of the input power supply, a process for measuring the temperature of the secondary battery that is a power supply source to the connected equipment,
While calculating a temperature change rate that is a change per unit time of the measured temperature, whether the temperature change rate is greater than or equal to a thermal escape determination value that is a determination value of whether or not thermal escape has occurred When the temperature change rate is equal to or higher than the thermal escape determination value, a power processing program for causing the computer to execute a process of stopping the supply of the charging current to the secondary battery.
(Appendix 14)
After the temperature of the secondary battery is measured, the measured temperature is compared with a first reference temperature that is a temperature at which it is determined that no thermal escape has occurred, and the measured temperature is The power supply processing program according to supplementary note 13, wherein when the temperature is lower than the first reference temperature, the computer does not calculate the temperature change rate and does not stop the supply of the charging current.
(Appendix 15)
After the temperature of the secondary battery is measured, the measured temperature is compared with a second reference temperature, which is a temperature at which it is determined that thermal escape has occurred, and the measured temperature is The power supply processing program according to appendix 13 or appendix 14, wherein when the temperature is equal to or higher than the second reference temperature, the computer executes a process of stopping the supply of the charging current without calculating the rate of temperature change.
(Appendix 16)
When stopping the supply of the charging current, among the measured temperature change rates calculated from the plurality of secondary batteries, to the secondary battery in which a temperature change rate equal to or higher than the thermal escape determination value is detected. The power supply processing program according to any one of supplementary notes 13 to 15, which causes a computer to execute a process of stopping only supply of a charging current.
(Appendix 17)
Processing to measure the ambient temperature of the environment where the device is installed;
When the supply of the charging current is stopped, a temperature difference change rate that is a change per unit time of a temperature difference between the ambient temperature and the temperature of the secondary battery is calculated, and the temperature difference change rate is calculated as the thermal escape rate. The power supply processing program according to any one of supplementary note 13 to supplementary note 16, which causes a computer to execute a process of stopping supply of a charging current to the secondary battery when the determination value is equal to or greater than a determination value.
(Appendix 18)
Any one of appendix 13 to appendix 17, which causes the computer to execute a process of disconnecting the input power source and the secondary battery by a switch connecting the input power source and the secondary battery when the supply of the charging current is stopped The power supply processing program described in the section.

DESCRIPTION OF SYMBOLS 10 Uninterruptible power supply device 11 Converter 12 Inverter 13 Switch 14 Battery 15 Thermistor 16 Battery temperature detector 17 Control part 21 A / D converter 22 Switch opening / closing drive part 23 Battery abnormality notification part 24 Processor 25 Storage part

Claims (10)

In the event of a power failure of the input power supply, a secondary battery that serves as a power source for the connected equipment,
Measuring means for measuring the temperature of the secondary battery;
When the measured temperature is compared with a first reference temperature that is a temperature at which it is determined that no thermal escape has occurred, and the measured temperature is equal to or higher than the first reference temperature, the measurement The temperature change rate, which is a change per unit time of the measured temperature, is calculated, and it is determined whether the temperature change rate is equal to or greater than a heat escape determination value that is a determination value as to whether or not heat escape has occurred. When the temperature change rate is equal to or higher than the thermal escape determination value, supply of the charging current to the secondary battery is stopped, and when the measured temperature is lower than the first reference temperature, the temperature An uninterruptible power supply comprising: charge stopping means that does not calculate a rate of change and does not stop the supply of the charging current . The charging stop means compares the measured temperature with a second reference temperature that is a temperature at which thermal escape is determined to occur, and the measured temperature is equal to or higher than the second reference temperature. If not, the supply of the charging current is stopped without calculating the temperature change rate.
The uninterruptible power supply according to claim 1. A plurality of the secondary batteries;
The measuring means for measuring the temperature of each secondary battery,
The charging stop means only supplies a charging current to a secondary battery in which a temperature change rate equal to or higher than the thermal escape determination value is detected among the measured temperature change rates calculated from the secondary batteries. Stop
The uninterruptible power supply according to claim 1 or 2 . It further comprises ambient temperature measuring means for measuring the ambient temperature of the environment where the device is installed,
The charging stop means calculates a temperature difference change rate that is a change per unit time of a temperature difference between the ambient temperature and the temperature of the secondary battery, and the temperature difference change rate is equal to or greater than the thermal escape determination value. The supply of charging current to the secondary battery is stopped.
The uninterruptible power supply device according to any one of claims 1 to 3.   The charging stop means includes a switch for connecting the input power source and the secondary battery, and when the supply of the charging current is stopped, the input power source and the secondary battery are disconnected by the switch.
The uninterruptible power supply device according to any one of claims 1 to 4. In the event of a power failure of the input power supply, measure the temperature of the secondary battery that is the power supply source for the connected equipment, using the measuring means,
When the measured temperature is compared with a first reference temperature that is a temperature at which it is determined that no thermal escape has occurred, charging is stopped when the measured temperature is equal to or higher than the first reference temperature. The temperature change rate that is a change per unit time of the measured temperature is calculated by the means, and the temperature change rate is equal to or higher than a thermal escape determination value that is a determination value of whether or not thermal escape has occurred. If the temperature change rate is equal to or greater than the thermal escape determination value, the charging current supply to the secondary battery is stopped, and the measured temperature is less than the first reference temperature. If there is, the temperature change rate is not calculated and the supply of the charging current is not stopped.
Power supply processing method. The charge stopping unit compares the measured temperature with a second reference temperature, which is a temperature at which it is determined that thermal escape has occurred, after the temperature of the secondary battery is measured, When the measured temperature is equal to or higher than the second reference temperature, the supply of the charging current is stopped without calculating the temperature change rate.
The power supply processing method according to claim 6. Measuring the temperature of the plurality of secondary batteries by a measuring means;
The charging stop means only supplies a charging current to a secondary battery in which a temperature change rate equal to or higher than the thermal escape determination value is detected among the measured temperature change rates calculated from the secondary batteries. Stop
The uninterruptible power supply method according to claim 6 or 7 . The ambient temperature measurement means measures the ambient temperature of the environment where the device is installed,
The charging stop means calculates a temperature difference change rate that is a change per unit time of a temperature difference between the ambient temperature and the temperature of the secondary battery when stopping the supply of the charging current, and the temperature difference change When the rate is equal to or greater than the thermal escape determination value, supply of charging current to the secondary battery is stopped.
The power supply processing method according to claim 6. In the event of a power failure of the input power supply, a process for measuring the temperature of the secondary battery that is a power supply source to the connected equipment,
When the measured temperature is compared with a first reference temperature that is a temperature at which it is determined that no thermal escape has occurred, charging is stopped when the measured temperature is equal to or higher than the first reference temperature. The temperature change rate that is a change per unit time of the measured temperature is calculated by the means, and the temperature change rate is equal to or higher than a thermal escape determination value that is a determination value of whether or not thermal escape has occurred. If the temperature change rate is equal to or greater than the thermal escape determination value, the charging current supply to the secondary battery is stopped, and the measured temperature is less than the first reference temperature. In some cases, a power supply processing program for causing a computer to execute a process that does not calculate the temperature change rate and does not stop the supply of the charging current .

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