JP2004119112A - Power supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply device in which high capacity, space saving, and long life are realized, the estimation of the life span is easy, and the estimated life span is not affected by the work of maintenance and inspection, and in which the battery replacement date can be displayed surely. <P>SOLUTION: The battery ECU 7 estimates the life period during which a prescribed electric amount can be supplied from a date of manufacture of the battery packs 41, 42, and transmits the estimated life period to the MPU 10. The MPU adds the date of manufacture that is inputted from the input part 11 and stored inside and the life period transmitted from the battery ECU 7, and displays the next replacement date on the display part 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power supply device, and more particularly to a communication DC power supply device that is installed in a wireless communication base station or the like and has a nickel-hydrogen secondary battery mounted as a backup power supply at the time of a power failure or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a lead storage battery has been used as a backup power supply at the time of power failure or maintenance in a communication DC power supply device installed in a base station such as a mobile phone (for example, see Patent Document 1). This lead storage battery is float-charged by a DC voltage obtained by rectifying an AC voltage of a commercial power supply with a rectifier, and no charge control is performed.
[0003]
In addition, methods for determining the deterioration and life of a lead-acid battery used in such a power supply include: (1) the internal resistance of the battery increases with the progress of deterioration depending on the environmental temperature, and the voltage due to the load current is increased. (2) A method of calculating and determining the amount of discharged electricity by periodically performing a discharge test on a lead storage battery, and (3) Installation of a current date and a lead storage battery. Obtain the number of years elapsed since the battery was installed from the date, subtract the number of years elapsed from the standard life corresponding to the average temperature of the lead-acid battery, and add the remaining years to the life (remaining years) or the current date to the remaining years. There is a method of displaying a time (for example, see Patent Document 2).
[0004]
[Patent Document 1]
JP-A-5-315015
[0005]
[Patent Document 2]
JP-A-7-310233
[0006]
[Problems to be solved by the invention]
In recent years, power demand for communication DC power supplies has been increasing, and their installation space is also limited. However, when a lead-acid battery is used as a backup power supply for a communication DC power supply, there is a problem in terms of high capacity and space saving, and the service life due to aging is short, and costs increase due to maintenance and inspection. There is also the problem of doing.
[0007]
Further, the above-described conventional method (3) in which the remaining years are added to the current date to determine the service life (the next replacement date) has the following problem.
(A) The current date of the calendar IC provided in the battery monitoring means (battery ECU (Electronic Control Unit)) for monitoring the state of the battery changes by adjusting the time during maintenance and inspection. The next exchange date will also change.
(B) At the time of maintenance / inspection, it is not possible to advance the current date and test whether a replacement request signal is issued.
(C) It is necessary to inform the battery ECU that the battery has been replaced, and a new signal is required.
(D) Until the discharge capacity test is performed after the battery replacement and the correction based on the result is performed, the new and old manufacturing is not reflected in the replacement date display value. FIG. 5A is a graph showing a replacement date display value with respect to an actual date when the production date of the replacement battery is unknown. In FIG. 5A, the battery life is set to eight years. In August 2002, the battery was replaced with a battery with a manufacturing date of August 2002. Eight years later, in August 2010, the manufacturing date was unknown at the time of replacement (actually, the battery was manufactured in August 2008). When the battery is replaced, the replacement date display value becomes 2018. Next, when a discharge capacity test was performed, for example, six months after August 2010, that is, at the time of a periodic inspection in February 2011, deterioration of the storage capacity was observed. It will be deducted by two years from August 2018 and revised in August 2016. Thus, a time lag occurs in updating the exchange date display value.
[0008]
The present invention has been made in view of such a problem, and an object of the present invention is to use a nickel-hydrogen secondary battery instead of a lead storage battery to achieve high capacity, space saving, and long life. It is another object of the present invention to provide a power supply device that can easily estimate the life, does not affect the estimated life during maintenance and inspection, and can reliably display the battery replacement date.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a first power supply device according to the present invention includes a battery pack formed by connecting a plurality of nickel-hydrogen rechargeable batteries in series, and rectifies AC power from a commercial power supply to perform communication, for example. A rectifier that supplies DC power to the load including the device and the assembled battery; charge control means for receiving the DC power from the rectifier to control charging of the electric energy to the assembled battery; Based on discharge control means for controlling discharge, voltage information (V11, V12, V13, V14; V21, V22, V23, V24), current information (I1; I2), and temperature information (Tb1; Tb2) of the battery pack. A battery monitoring means (battery ECU) for calculating at least the remaining capacity (SOC1; SOC2) of the assembled battery and monitoring the state of the assembled battery, and an input unit for inputting the date of manufacture of the assembled battery when replacing the battery. The battery monitoring unit estimates a life period in which a predetermined amount of electricity (for example, 80 Ah) can be supplied starting from the production date of the battery pack, and adds the estimated life period and the production date to the next replacement time. It is characterized in that an operation for a date is performed.
[0010]
In order to achieve the above object, a second power supply device according to the present invention includes a battery pack formed by connecting a plurality of nickel-hydrogen rechargeable batteries in series, and rectifies AC power from a commercial power supply, for example, to perform communication. A rectifier that supplies DC power to the load including the device and the assembled battery; charge control means for receiving the DC power from the rectifier to control charging of the electric energy to the assembled battery; Based on discharge control means for controlling discharge, voltage information (V11, V12, V13, V14; V21, V22, V23, V24), current information (I1; I2), and temperature information (Tb1; Tb2) of the battery pack. A battery monitoring means (battery ECU) for calculating at least the remaining capacity (SOC1; SOC2) of the assembled battery and monitoring the state of the assembled battery; an output voltage of the rectifier; A monitoring control unit (MPU) that controls the charge control unit and the discharge control unit in accordance with the instruction of (1), and an input unit that inputs the date of manufacture of the battery pack when the battery is replaced. Starting from the date, a life period capable of supplying a predetermined amount of electricity (for example, 80 Ah) is estimated, the estimated life period (for example, 8 years) is transmitted to the monitoring control unit, and the monitoring control unit receives an input from the input unit. Then, the production date stored therein and the life period transmitted from the battery monitoring means are added to perform an operation for setting the next replacement date.
[0011]
In the power supply device according to the present invention, the battery monitoring means erases the history of the battery pack required for estimating the life span when replacing the battery.
[0012]
According to the above configuration, by using a nickel-hydrogen secondary battery instead of a lead storage battery, high capacity, space saving, and long life can be achieved.
[0013]
Further, since the replacement date is calculated by adding the estimated life period to the manufacturing date of the battery pack, the replacement date does not change even if the time is adjusted at the time of maintenance / inspection for the conventional problem (A). However, it can be confirmed that, by advancing the current date with respect to the above-mentioned conventional problem (B), a replacement request signal is issued. By using the change in the signal for battery replacement, a new signal is not required, and the addition of the battery manufacturing date and the estimated life period is performed by the MPU as in the configuration of the second power supply device. The amount of signal transmission from the battery ECU to the MPU can be reduced, and for the above-mentioned conventional problem (D), immediately after battery replacement, the new and old manufacturing is reflected in the replacement date display value. In the conventional power supply device, as shown in FIG. 5A, when the battery is replaced in August 2010 and the battery is manufactured in August 2008 and the life is eight years, the replacement date display value is 2018. In the first or second power supply according to the present invention, the exchange date display value is immediately set to August 2016, as shown in FIG.
[0014]
Further, since the lifetime depends only on the battery characteristics, it is easy to estimate the lifetime.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0016]
FIG. 1 is a block diagram illustrating a configuration example of a power supply device according to an embodiment of the present invention. In FIG. 1, 1 is a 50 Hz or 60 Hz commercial power supply, 2 is a rectifier that rectifies the AC power of the commercial power supply 1 to generate DC power (for example, nominal voltage VCC = −48 V), and 3 is a load including communication equipment and the like. (The current rating is, for example, 60 A).
[0017]
Reference numeral 41 denotes a first assembled battery (for example, a capacity of 100 Ah) in which four unit batteries (for example, battery modules) each composed of a nickel-hydrogen secondary battery are connected in series, and reference numeral 42 denotes a unit battery composed of a nickel-hydrogen secondary battery. (For example, a battery module) is a second assembled battery in which four are connected in series and connected in parallel with the first assembled battery 41. Although FIG. 1 illustrates a case where two battery packs are connected in parallel, if necessary, only one battery pack or three or more battery packs may be connected in parallel. Needless to say, it's good.
[0018]
Reference numeral 5 denotes charging control means for receiving the DC power from the rectifier 2 and controlling the charging of the amount of electricity to the first assembled battery 41 and the second assembled battery 42, and 6 designates the first assembled battery 41 and the second assembled battery. It is a discharge control unit that controls the discharge of the amount of electricity charged in the battery 42. The charge control means 5 and the discharge control means 6 are configured to include two sets of power switch elements and a backflow prevention diode corresponding to the first assembled battery 41 and the second assembled battery 42, respectively. .
[0019]
Reference numeral 7 denotes a battery monitoring unit (battery ECU (Electronic Control Unit)), which includes voltage information (V11, V12, V13, V14) of the first assembled battery 41, current information (I1) of the first assembled battery 41, And at least the remaining capacity SOC1 of the first assembled battery 41 is calculated based on the temperature information (Tb1) of the first assembled battery 41 and the voltage information (V21, V22, V23, V24) of the second assembled battery 42. ), The remaining capacity SOC2 of at least the second assembled battery 42 is calculated based on the current information (I2) of the second assembled battery 42 and the temperature information (Tb2) of the second assembled battery 42, The status of the assembled battery 41 and the second assembled battery 42 is monitored.
[0020]
Reference numeral 81 denotes a current sensor that detects a charge / discharge current flowing through the first assembled battery 41, and reference numeral 82 denotes a current sensor that detects a charge / discharge current flowing through the second assembled battery 42.
[0021]
Reference numeral 9 denotes a step-up means for reducing the DC voltage from the rectifier 2 at the time of a power failure or at the time of a battery discharge capacity test, and the voltage of the first assembled battery 41 and the second assembled battery 42 at the end of discharge. When the voltage falls below a voltage value of 1 (battery voltage value higher than the lower limit value of the operation guarantee voltage of the load 3, for example, 46 volts), the voltage supplied to the load 3 is boosted to maintain the first voltage value. do.
[0022]
Reference numeral 10 denotes a monitoring control unit (MPU) which controls the output voltage from the rectifier 2 and issues an instruction (charge start) from the battery ECU 7 during a discharge capacity test of the first assembled battery 41 and the second assembled battery 42. In response to a request (CSTART), a charge stop request (CSTOP), a discharge start request (DSTART), a discharge stop request (DSTOP), etc., the charge / discharge operation by the charge control unit 5 and the discharge control unit 6 is controlled.
[0023]
Further, the MPU 10 stores the manufacturing date of the battery pack input from the input unit 11 by the operator at the time of battery replacement, receives the estimated life time from the battery ECU 7, and determines the manufacturing date and the estimated life time of the battery pack. The result of the addition is displayed on the display unit 12 as the next exchange date (exchange date display value).
[0024]
Next, the charging / discharging operation of the power supply device configured as described above will be described with reference to FIGS. 2, 3, 4A, and 4B in addition to FIG.
[0025]
FIG. 2 is a diagram showing a basic charge / discharge operation in the power supply device of FIG. 1, and FIG. 3 is a diagram showing a charge / discharge operation in the case where a charge interruption occurs in the power supply device of FIG. The upper part of FIGS. 2 and 3 shows the time change of the remaining capacity SOC1 of the first assembled battery 41 and the time change of the remaining capacity SOC2 of the second assembled battery 42 due to charging and discharging. The lower side shows flags indicating various requests and states.
[0026]
FIG. 4A is a diagram showing a time change of each part voltage during a discharge capacity test, and FIG. 4B is a diagram showing a time change of a discharge current (I) and a discharge electric quantity (Q). In FIG. 4A, a period T31 is a period of a steady state, a period T32 is a period for slightly lowering the output voltage VR of the rectifier 2 to confirm the circuit operation, a period T33 is a standby period, and a period T34 is a period when the battery voltage VB is lower. The period T35 is a discharging period in which the battery voltage VB is falling and a period in which the boosting unit 9 is operating, and the period T35 is a period in which the boosting unit 9 is not operating. Further, VL indicates a voltage supplied to the load 2 and VO indicates a voltage range in which the load 2 can operate.
[0027]
In FIG. 2, when the battery ECU 7 issues a charge start request (CSTART1) for the first assembled battery 41 at the start of the period T1 (initial charge period) (at the time of battery replacement), the MPU 10 receives the request. The corresponding power switch element of the charging control means 5 is controlled to be turned on, and charging of the first assembled battery 41 (for example, constant current charging of 10 A) is performed.
[0028]
Next, when the battery ECU 7 detects that the state of charge SOC1 of the first assembled battery 41 has reached a full charge (100%), the battery ECU 7 issues a charge current control request CC1 to the first assembled battery 41, for example. 3A is charged for a predetermined time, and the charge start request (CSTART1) is released. In this state, the first assembled battery 41 enters a standby state as a backup power supply.
[0029]
At the same time, the battery ECU 7 issues a charge start request (CSTART2) to the second assembled battery 42, and in response to this, the MPU 10 controls the corresponding power switch element of the charge control means 5 to the ON state, and Charging of the assembled battery 42 (for example, constant current charging of 10 A) is performed.
[0030]
Next, when the battery ECU 7 detects that the state of charge SOC2 of the second assembled battery 42 has reached a full charge (100%), the battery ECU 7 issues a charge current control request CC2 to the second assembled battery 42, for example. 3A is charged for a predetermined time, and the charge start request (CSTART2) is released. In this state, the second assembled battery 42 enters a standby state as a backup power supply.
[0031]
In a period T2 in which the first assembled battery 41 and the second assembled battery 42 are in the standby state, the remaining capacities SOC1 and SOC2 decrease due to the self-discharge of the assembled battery. When the state of charge SOC1 of the first assembled battery 41 decreases to the first state of charge SOCt1 (for example, 80%), the battery ECU 7 issues a charge start request (CSTART1) to the first assembled battery 41, and issues this request. In response, the MPU 10 controls the corresponding power switch element of the charging control means 5 to the on state, and the first assembled battery 41 is charged (for example, constant current charging of 10 A).
[0032]
Next, when detecting that the state of charge SOC1 of the first assembled battery 41 has reached full charge (100%), the battery ECU 7 issues a charge current control request CC1 to the first assembled battery 41. For example, 3A charging is performed for a predetermined time, and the charging start request (CSTART1) is released. Thereby, the auxiliary battery 41 is supplementarily charged.
[0033]
When the state of charge SOC2 of the second assembled battery 42 decreases to the first state of charge SOCt1 (for example, 80%), the battery ECU 7 issues a charge start request (CSTART2) to the second assembled battery 42, In response to this, the MPU 10 controls the corresponding power switch element of the charging control means 5 to the on state, and the second assembled battery 42 is charged (for example, constant current charging of 10 A).
[0034]
Next, when detecting that the state of charge SOC2 of the second assembled battery 42 has reached the full charge (100%), the battery ECU 7 issues a charge current control request CC2 to the second assembled battery 42. For example, the charging of 3A is performed for a predetermined time, and the charging start request (CSTART2) is released. As a result, auxiliary charging is performed on the second assembled battery 42.
[0035]
In this manner, in the period T2, the self-discharge of the first assembled battery 41 and the second assembled battery 42 and the supplementary charge for compensating the decrease in the remaining capacity due to the self-discharge are repeatedly performed.
[0036]
In the period T3, in order to determine the deterioration state of the battery, the MPU 10 performs a battery discharge capacity test, for example, every six months from the time of replacement. Here, the discharge capacity test for the second assembled battery 42 will be described as an example. First, the test waiting flag (WAIT) is set, and after a predetermined time has elapsed, the test waiting flag (WAIT) is lowered and, at the same time, the test charging flag (TCS) is set. The battery ECU 7 receives a test request from the MPU 10 and issues a charge start request (CSTART2) for the second assembled battery 42. In response to this, the MPU 10 turns on the corresponding power switch element of the charge control unit 5 in the on state. And the second assembled battery 42 is charged (for example, constant current charging of 10 A).
[0037]
Next, when detecting that the state of charge SOC2 of the second assembled battery 42 has reached the full charge (100%), the battery ECU 7 issues a charge current control request CC2 to the second assembled battery 42. For example, 3A charging is performed for a predetermined time, and the charging start request (CSTART2) is released.
[0038]
At the same time, the battery ECU 7 determines that a power failure or the like has occurred during the discharge capacity test on the second assembled battery 42, and as a result of the discharge capacity test, the second assembled battery 42 that is the subject of the deterioration determination The MPU 10 turns on the corresponding power switch element of the charge control unit 5 in response to the request to start charging the backup first assembled battery 41 (CSTART1). The state is controlled, and charging of the first assembled battery 41 (for example, constant current charging of 10 A) is performed.
[0039]
Next, when detecting that the state of charge SOC1 of the first assembled battery 41 has reached full charge (100%), the battery ECU 7 issues a charge current control request CC1 to the first assembled battery 41. For example, 3A charging is performed for a predetermined time, and the charging start request (CSTART1) is released.
[0040]
As a result, the test charging flag (TCS) is lowered, and the test charging end flag (TCE) is set for a predetermined time.
[0041]
When the test charge end flag (TCE) is lowered, the battery ECU 7 issues a discharge stop request (DSTOP1) to the first assembled battery 41, and in response, the MPU 10 causes the corresponding power switch element of the discharge control means 6 to operate. Is turned off, and discharge from the first assembled battery 41 is prohibited. Thereafter, the battery ECU 7 issues a discharge start request (DSTART2) to the second assembled battery 42, and in response, the MPU 10 sets the test-in-progress flag TEST, and turns on the corresponding power switch element of the discharge control means 6. While controlling the state, the rectifier 2 is controlled to reduce its output voltage VR to a second voltage value (for example, 45 volts) (period T34 in FIG. 4A), and the test from the second assembled battery 42 is performed. Discharge starts.
[0042]
Here, the output voltage VR of the rectifier 2 decreases, the battery voltage VB decreases due to the discharge from the second assembled battery 42, and the voltage VL supplied to the load 3 becomes the first voltage value (for example, 46 volts). (Period T34 in FIG. 4A), the booster 9 operates to boost the battery voltage VB and maintain the voltage VL supplied to the load 3 at a first voltage value (for example, 46 volts) (FIG. 4). 4A period T35). Thereby, the operation assurance voltage can be supplied to the load 3.
[0043]
Next, when detecting that the battery voltage has reached the third voltage value (for example, 43 volts) corresponding to the discharge lower limit voltage value from the voltage information V11 to V14 and V21 to V24, the battery ECU 7 notifies the MPU 10 of the end of the test. Notify In response, the MPU 10 sets a test end flag (TEND). At this time, as shown in FIG. 4B, the battery ECU 7 calculates a discharge electric quantity Q at the end of discharge from the discharge current I, and sets the discharge electric quantity Q to a first threshold value (for example, 80% of the rated capacity of the battery). It is determined whether it is equal to or greater than 80 Ah). If the result of the determination is that the amount of discharged electricity Q is greater than or equal to the first threshold, it is determined that the storage capacity is normal without any deterioration of the storage capacity, and that the amount of discharged electricity Q is less than the first threshold and a second threshold (for example, 70 Ah). If the above is the case, the storage capacity is degraded, and if the amount of discharged electricity Q is less than the second threshold, the second assembled battery 42 is determined to have reached the end of life, and the battery ECU 7 reports the test result to the MPU 10.
[0044]
The test result includes the estimated life period of the second assembled battery 42. The estimated life period is determined by a preset initial life period of, for example, 8 years and a decrease in the amount of discharged electricity Q with respect to the actual use period. It is calculated by the battery ECU 7 in accordance with the degree of deterioration based on this. When the battery ECU 7 determines that the currently used second battery pack 42 has reached the end of its life, the worker who has been notified by the MPU 10 will later replace the battery pack with a replacement battery pack and replace it. When the manufacture date of the assembled battery is input from the input unit 11, the MPU 10 stores the manufacture date of the assembled battery in an internal memory (not shown), and stores the manufacture date and the estimated life period transmitted from the battery ECU 7. And displays the result of the addition on the display unit 12 as the next exchange date.
[0045]
At the time of battery replacement, the battery ECU 7 uses the temperature state (for example, a high temperature state, a low temperature state, etc.) and the voltage state (such as the voltage variation of the battery module, etc.) of the second assembled battery 42 used so far. The history is erased, and the history of the newly installed battery pack is obtained.
[0046]
When the discharge capacity test is completed in this way, in the period T4, the battery ECU 7 cancels the discharge stop request (DSTOP1) for the first assembled battery 41 and requests the start of charge (CSTART2) for the second assembled battery 42. In response to this, the MPU 10 controls the corresponding power switch element of the charge control means 5 to the ON state, and the second assembled battery 42 is charged (for example, constant current charging of 10 A).
[0047]
Next, when detecting that the state of charge SOC2 of the second assembled battery 42 has reached the full charge (100%), the battery ECU 7 issues a charge current control request CC2 to the second assembled battery 42. For example, the charging of 3A is performed for a predetermined time, and the charging start request (CSTART2) is released.
[0048]
In the subsequent period T5, as in the period T2, the self-discharge of the first assembled battery 41 and the second assembled battery 42 and the supplementary charge for compensating the decrease in the remaining capacity due to the self-discharge are repeatedly performed.
[0049]
FIG. 3 is a diagram showing a charging / discharging operation when charging is interrupted in the power supply device of FIG. 1, and periods T2 and T4 are the same as those of FIG. 2. FIG. 3 differs from FIG. 2 in that during the period T1 which is the initial charging period, the interruption of the initial charging of the second assembled battery 42 occurs, and in the period T3 which is the battery capacity testing period, the first charging is stopped. The point is that the supplementary charging of the assembled battery 41 is interrupted.
[0050]
During the period T1 in FIG. 3, during the initial charging of the second assembled battery 42, the battery ECU 7 determines that the temperature of the second assembled battery 42 has become equal to or higher than the predetermined temperature (for example, 60 ° C.) from the temperature information Tb2. Is detected, the charging efficiency has been lowered due to the high temperature, so the charging start request (CSTART2) that has been started is temporarily released, and charging is interrupted.
[0051]
When the temperature of the second assembled battery 42 drops below a predetermined temperature (for example, 60 ° C.) due to the interruption of charging, the battery ECU 7 issues a charge start request (CSTART2) again, and the second assembled battery 42 Resume charging.
[0052]
Further, during the period T3 of FIG. 3, during the supplementary charging of the first assembled battery 41, the battery ECU 7 determines that the temperature of the first assembled battery 41 becomes equal to or higher than the predetermined temperature (for example, 60 ° C.) from the temperature information Tb1. When it is detected that the charging efficiency has been lowered due to the high temperature, the charging start request (CSTART1) that has been started is temporarily released and charging is interrupted.
[0053]
When the temperature of the first assembled battery 41 decreases to a temperature lower than a predetermined temperature (for example, 60 ° C.) due to the interruption of the charging, the battery ECU 7 issues a charge start request (CSTART1) again, and the first assembled battery 41 Resume charging.
[0054]
As described above, according to the present embodiment, by using a nickel-hydrogen secondary battery having a high energy density (that is, capable of storing energy compactly) and a high output density, high capacity and space saving can be achieved. In addition to prolonging the service life, the battery replacement date is obtained by adding the manufacturing date and the estimated service life of the battery pack, making it easier to estimate the service life and affecting the service life during maintenance and inspection. In addition, it is possible to realize a power supply device capable of reliably displaying a battery replacement date.
[0055]
In the present embodiment, the discharge control means 6 can also function as a step-down means. When the battery voltage rises and reaches a fourth voltage value (for example, 55 volts) in a state close to full charge, the step-down means operates to step down the battery voltage and change the voltage supplied to the load 3 to the fourth voltage. (For example, 55 volts). Thereby, the operation assurance voltage can be supplied to the load 3.
[0056]
Further, in this embodiment, the discharge control means 6 can also function as an overdischarge prevention means. When the battery ECU 7 detects a deep discharge due to the battery voltage dropping to the discharge termination voltage value, it issues a discharge stop request and causes the discharge control means 6 to stop discharging from the assembled battery. Thus, overdischarge can be easily prevented.
[0057]
Further, in the present embodiment, the power supply device may include a cooling unit (for example, a cooling fan) for the battery pack. In this case, the battery ECU 7 turns on the cooling fan to cool the battery pack while charging the battery pack and when the battery temperature is high even after the charging is completed. Thereby, it is possible to perform optimal charging control while suppressing a decrease in charging efficiency of the battery pack.
[0058]
In the present embodiment, the display unit is configured to be provided in the power supply device itself. However, the power supply device does not have a display unit, and is connected via a network at a power supply centralized management center that centrally manages power supply devices in various places. , The exchange date may be displayed on a display unit provided at the center. At this time, the power supply unit may or may not have a duplicate display unit, or only emits light and sounds when the replacement date is reached or when a predetermined number of days is expired. You may do it. The worker can replace the battery pack by a notification from the power supply unit central management center or by turning on and off the power supply unit.
[0059]
【The invention's effect】
As described above, according to the present invention, by using a nickel-hydrogen secondary battery having a high energy density (that is, capable of storing energy compactly) and a high output density, high capacity and space saving can be achieved. In addition, it is possible to realize a power supply device that can extend the service life, easily estimate the service life, does not affect the estimated service life during maintenance and inspection, and can reliably display the battery replacement date. It has a special effect.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration example of a power supply device according to an embodiment of the present invention.
FIG. 2 is a diagram showing a basic charge / discharge operation in the power supply device of FIG. 1;
FIG. 3 is a diagram showing a charging / discharging operation when a charging interruption occurs in the power supply device of FIG. 1;
FIG. 4A is a diagram showing a time change of each part voltage during a discharge capacity test.
FIG. 4B is a diagram showing a time change of a discharge current (I) and a discharge electric quantity (Q).
FIG. 5A is a graph showing an exchange date display value with respect to a real date in a conventional power supply device.
FIG. 5B is a graph showing an exchange date display value with respect to an actual date in the power supply device of the embodiment.
[Explanation of symbols]
1 Commercial power supply
2 Rectifier
3 Load
41 1st assembled battery
42 Second battery pack
5 Charge control means
6 Discharge control means
7 Battery monitoring means (battery ECU)
81, 82 Current sensor
9 Boost means
10 Monitoring control unit (MPU)
11 Input section
12 Display

Claims (4)

An assembled battery comprising a plurality of nickel-hydrogen secondary batteries connected in series;
A rectifier that rectifies AC power from a commercial power supply and supplies DC power to the load and the battery pack;
Charge control means for receiving the DC power from the rectifier and controlling the charging of the amount of electricity to the battery pack,
Discharge control means for controlling the discharge of the amount of electricity charged in the battery pack,
Battery monitoring means for calculating at least the remaining capacity of the battery pack based on the voltage information, current information, and temperature information of the battery pack, and monitoring the state of the battery pack,
An input unit for inputting a manufacturing date of the battery pack at the time of battery replacement,
The battery monitoring unit estimates a life period during which a predetermined amount of electricity can be supplied starting from a production date of the battery pack, and calculates a result obtained by adding the estimated life period and the production date as a next replacement date. A power supply device characterized by performing: An assembled battery comprising a plurality of nickel-hydrogen secondary batteries connected in series;
A rectifier that rectifies AC power from a commercial power supply and supplies DC power to the load and the battery pack;
Charge control means for receiving the DC power from the rectifier and controlling the charging of the amount of electricity to the battery pack,
Discharge control means for controlling the discharge of the amount of electricity charged in the battery pack,
Battery monitoring means for calculating at least the remaining capacity of the battery pack based on the voltage information, current information, and temperature information of the battery pack, and monitoring the state of the battery pack,
A monitoring control unit that controls the output voltage of the rectifier and controls the charge control unit and the discharge control unit in accordance with an instruction from the battery monitoring unit;
An input unit for inputting a manufacturing date of the battery pack at the time of battery replacement,
The battery monitoring unit estimates a life period in which a predetermined amount of electricity can be supplied starting from a manufacturing date of the battery pack, transmits the estimated life period to the monitoring control unit, and the monitoring control unit A power supply unit that adds the manufacturing date input from the unit and stored therein and the life period transmitted from the battery monitoring unit to calculate a next replacement date. 3. The power supply device according to claim 1, wherein the battery monitoring unit erases a history of the battery pack required for estimating the life span when replacing the battery. 4. The power supply device according to claim 1, wherein the load includes a communication device.

Images