JP2009071999A - Power storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mechanism capable of safely fitting an additional battery of an uninterruptible power supply device. <P>SOLUTION: A power storage device includes: a terminal; power storage means, connected to the terminal with a power line, for storing power on the basis of the voltage applied via the power line; detecting means for detecting the magnitude of the voltage of the power storage means; and current limiting means, interposed by the power line connecting the terminal and the storage means, for suppressing the current flowing into the storage means from the terminal through itself when the magnitude of the voltage detected by the detecting means satisfies a prescribed condition. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power storage device.

The uninterruptible power supply is used by being inserted between a commercial AC power supply and a load device. The uninterruptible power supply stores the DC voltage converted from the AC power supplied from the commercial AC power supply in its own battery, and if the supply of power from the commercial AC power supply is delayed due to the occurrence of a power failure, etc. The alternative power obtained from the battery is supplied to the load equipment. The time during which power can be supplied from the uninterruptible power supply to the load device depends on the relationship between the power consumption of the load device and the storage capacity of the battery. Therefore, many uninterruptible power supply devices are equipped with a connector for connecting an additional battery in order to facilitate the supply of power to a load device with higher power consumption (see FIG. 3 of Patent Document 1). )
JP-A-2005-198458

  By the way, the additional battery of the uninterruptible power supply is used in a state of being connected in parallel with a built-in battery mounted in advance. Therefore, if both are connected in a state where the voltage difference between the newly installed additional battery and the built-in battery is large, an excessive current may flow from one battery to the other battery, causing damage.

  The present invention has been devised under such a background, and an object thereof is to provide a mechanism capable of safely mounting an additional battery of an uninterruptible power supply.

  A power storage device according to a preferred aspect of the present invention includes a terminal, a power storage unit that is connected to the terminal and a power line, stores power based on a voltage applied through the power line, and a detection that detects the magnitude of the voltage of the power storage unit Current that flows from the terminal to the power storage means via itself when the magnitude of the voltage detected by the detection means satisfies a predetermined condition. And current limiting means for suppressing the above-described problem.

  And a receiving means for receiving a signal indicating the voltage of the power supply of the device connected to the terminal, wherein the current limiting means is a difference between the magnitude of the voltage detected by the detecting means and the magnitude of the voltage indicated by the received signal. When is larger than the threshold value, the current flowing from the terminal to the power storage means via itself may be suppressed to a predetermined value or less.

  In addition, the device further includes a transmission / reception unit that transmits a signal indicating the magnitude of the voltage detected by the detection unit to an external device, and that receives a signal designating whether to suppress the current from the device. When the means receives a signal instructing current suppression, the current flowing from the terminal to the power storage means via itself may be suppressed to a predetermined value or less.

  According to the present invention, the additional battery of the uninterruptible power supply can be safely mounted.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram illustrating a schematic hardware configuration of an uninterruptible power supply 10 and an additional battery device 50 (corresponding to “power storage device”) attached to the uninterruptible power supply 10. The uninterruptible power supply 10 includes a power receiving terminal 11, a power feeding terminal 12, a power failure detection relay 13, a first circuit breaker 14, a second circuit breaker 15, an AC switch 16, a converter 17, an inverter 18, a battery 19, a control unit 20, and an extension. Connector 21 is provided.

  The power receiving terminal 11 is an outlet plug, and has a structure in which a pair of metal blades are discharged from a hole formed in the front end of the cover, and each of the blades is connected to the power line 30. The power receiving terminal 11 is connected to a commercial AC power supply (not shown). The power supply terminal 12 is a plug socket, and a metal plug blade receiving member is provided on the back side of a hole having a shape into which a pair of plug blades of an outlet plug can be inserted, and each of the plug blade receiving members and the power line 30 are connected to each other. It has a connected structure. The power supply terminal 12 is connected to an outlet plug of a load device (not shown). For convenience of explanation, in FIG. 1, illustration of one of the two power lines 30 from the pair of plug blades of the power receiving terminal 11 to the pair of plug blade receiving members of the power supply terminal 12 is omitted. The power failure detection relay 13 is connected to the control unit 20 via the signal line 40, and when a voltage applied to the power receiving terminal 11 falls below a predetermined value, a signal to be supplied to the control unit 20 via the signal line 40. Switch from low level to high level.

  As shown in FIG. 1, the power line 30 connected to the power receiving terminal 11 is branched into two immediately after being drawn into the housing. Then, one of the branched power lines 30 is connected to the power supply terminal 12 with the first circuit breaker 14 interposed therebetween, thereby forming a maintenance bypass 31. The other power line 30 branches into two after passing through the second circuit breaker 15. One of the branched power lines 30 is connected to one input side terminal of the AC switch 16 to form an automatic bypass 32. The other power line 30 is connected to the other input side terminal of the AC switch 16 with the converter 17 and the inverter 18 interposed therebetween. The output side terminal of the AC switch 16 is connected to the power supply terminal 12. The first circuit breaker 14 and the second circuit breaker 15 are switched between on and off under the control of the control unit 20. The AC switch 16 is connected to the control unit 20 via the signal line 41, and connects one of the two input side terminals to the output side terminal under the control of the control unit 20.

  The converter 17 converts an AC voltage applied from a commercial AC power supply via the power receiving terminal 11 into a DC voltage. The inverter 18 converts the DC voltage into an AC voltage. A battery 19 that stores electricity based on the DC voltage applied from the converter 17 is connected to the power line 30 that connects the converter 17 and the inverter 18. The battery 19 is a lithium ion secondary battery, and the positive electrode and the negative electrode are respectively connected to two power lines 30 that connect the converter 17 and the inverter 18. Electric energy is stored in the battery 19 until the potential difference between the positive electrode and the negative electrode reaches the same level as the DC voltage applied from the converter 17. When the DC voltage applied from the converter 17 becomes lower than the potential difference between the positive electrode and the negative electrode due to a power failure or the like, the electric energy stored so far is discharged as a DC voltage. The discharged DC voltage is converted into an AC voltage by the inverter 18, and the converted AC voltage is applied to the power supply terminal 12.

  The control unit 20 operates in two modes, a constant inverter mode and a constant commercial mode. The mode is switched in response to designation from an operator (not shown). When the constant inverter mode is designated, the control unit 20 turns off the first circuit breaker 14 and turns on the second circuit breaker 15, and inputs and outputs of the AC switch 16 connected to the inverter 18. Connect to the side terminal. While an AC voltage is being applied from the commercial AC power source in this state, an AC voltage that has been converted by the converter 17 and the inverter 18 is applied to the power supply terminal 12. Then, when the application of the AC voltage from the commercial AC power supply stops, the inverter 18 converts the DC voltage of the battery 19 into AC, and the converted AC voltage is applied to the power supply terminal 12, and the alternative power corresponding to the AC voltage Is supplied to the load equipment.

  When the constant commercial mode is designated, the control unit 20 turns off the first circuit breaker 14 and turns on the second circuit breaker 15, and the input side terminal of the AC switch 16 that is not connected to the inverter 18 and its Connect to the output terminal. While the AC voltage is being applied from the commercial AC power source in this state, the AC voltage is applied to the power supply terminal 12 via the automatic bypass 32. When the application of the AC voltage from the commercial AC power supply stops, the control unit 20 that has specified that through a signal supplied from the power failure detection relay 13 inputs the input side terminal of the AC switch 16 connected to the inverter 18. And its output terminal are connected immediately. Then, the inverter 18 converts the DC voltage of the battery 19 into AC, and the converted AC voltage is applied to the power supply terminal 12. In this constant commercial mode, the supply of power to the load device is interrupted for a short time after the signal supplied from the power failure detection relay 13 to the control unit 20 transitions until the AC switch 16 is switched. Therefore, it is desirable to always specify the inverter mode when a load device that does not allow such instantaneous interruption is connected to the power supply terminal 12.

  The uninterruptible power supply 10 also turns on the first circuit breaker 14 and turns off the second circuit breaker 15 and applies an AC voltage from the commercial AC power supply to the power supply terminal 12 via the maintenance bypass 31. The first circuit breaker 14, the second circuit breaker 15, the converter 17, the inverter 18, the AC switch 16, the power supply terminal 12, and the battery 19 can be maintained.

  The extension connector 21 has one end of the power lines 42 and 43 connected to the positive and negative electrodes of the battery 19 exposed from a hole provided in the housing, and is male-engaged around one end of both exposed power lines 42 and 43. The structure is provided with members.

  The additional battery device 50 includes a first connector 51, a second connector 52, a battery 53 (corresponding to “power storage means”), a first electromagnetic switch 54, a second electromagnetic switch 55, and a current limiting circuit 56 (“ A voltage detection circuit 57 (corresponding to “detection means”), a control unit 58 (corresponding to a part of “current limiting means”), a start switch 59, a first diode 88, and A second diode 89 is included. Among these parts, the first connector 51 is configured such that one end of each of the two power lines 60 and 61 is exposed from a hole provided on the surface of the housing, and the female connector is placed around one end of the exposed power lines 60 and 61. It has a structure with a joint member. On the other hand, the second connector 52 exposes the other ends of the two power lines 60 and 61 from other holes provided on the surface of the casing, and the male ends around the other ends of the exposed power lines 60 and 61. The mold engaging member is provided. One end and the other end of these exposed power lines correspond to “terminals” in the claims. The female engagement member of the first connector 51 is paired with the male engagement member of the expansion connector 21, and the male engagement member of the second connector 52 has the same shape as that of the expansion connector 21. Eggplant. The extension connector 21 and the second connector 52 may both be female, and the first connector 51 may be male.

  Therefore, when the additional battery device 50 is attached to the uninterruptible power supply 10 and the first connector 51 and the additional connector 21 of the uninterruptible power supply 10 are connected, the power lines of both are connected. Further, when the additional battery device 50 is connected in series and the first connector 51 and the second connector 52 of the installed additional battery device 50 are connected, the power lines of both are connected. In this way, the additional battery devices 50 can be connected one after another.

  The battery 53 is a lithium ion secondary battery, and its positive electrode and negative electrode are connected to two power lines 60 and 61 that connect the first connector 51 and the second connector 52, respectively. A first diode 88 is interposed on one side of the power line 60 from the positive electrode of the battery 53 to the first connector 51. The other power line 60 is branched into two after passing through the second diode 89, and the first electromagnetic switch 54 is provided on one of the branched power lines 60, and the second electromagnetic switch 55 and the current limiting circuit 56 are provided on the other. Each is inserted. The first diode 88 is provided so as to flow current from the first connector 51 to the positive electrode of the battery 53, and the second diode 89 is provided so as to flow current from the positive electrode of the battery 53 to the first connector 51. Yes. Therefore, when the DC voltage of the uninterruptible power supply 10 is higher than the potential difference between the positive electrode and the negative electrode of the battery 53, the current from the uninterruptible power supply 10 to the battery 53 via the power line 60 into which the second diode 89 is inserted. When the DC voltage of the uninterruptible power supply 10 is lower than the potential difference between the positive electrode and the negative electrode of the battery 53, the battery 53 is connected to the uninterruptible power supply 10 via the power line 60 with the first diode 88 inserted. Current flows in. The first electromagnetic switch 54 and the second electromagnetic switch 55 are respectively connected by a control unit 58 and signal lines 71 and 72, which will be described later, while the signals supplied via the signal lines 71 and 72 are at a high level. Turns on and turns off while low. The current limiting circuit 56 limits the current flowing through the current limiting circuit 56 to a predetermined value or less. A voltage detection circuit 57 is inserted in another power line 62 that connects the positive electrode and the negative electrode of the battery 53. The voltage detection circuit 57 detects a charge level corresponding to the potential difference between the positive electrode and the negative electrode of the battery 53 and supplies a signal indicating the level to the control unit 58 via the signal line 73.

  The control unit 58 is a microcomputer including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), an input / output port, and the like. When the start switch 59 is turned on, the control unit 58 determines the magnitude relationship between the charge level indicated by the signal supplied from the voltage detection circuit 57 and a preset threshold value. The threshold value used for this determination is desirably the same as or slightly lower than the voltage (for example, 100 V) when the battery 19 of the uninterruptible power supply 10 is fully charged. When the control unit 58 determines that the level of charging is greater than the threshold value, the controller 58 switches the first electromagnetic switch 54 on and switches the second electromagnetic switch 55 off. Further, when it is determined that the level of charging is smaller than the threshold value, the first electromagnetic switch 54 is switched off and the second electromagnetic switch 55 is switched on.

  Then, as a result of determination based on a signal supplied from the voltage detection circuit 57 after that, when the magnitude relationship between the charge level and the threshold value is reversed, the control unit 58 reverses the first electromagnetic switch 54 and the second electromagnetic switch 55. Switch on and off again. In a state where the controller 58 performs such switching, the first device 51 of the own device and the extension connector 21 of the uninterruptible power supply device 10 are connected to each other from the battery 19 of the uninterruptible power supply device 10. This avoids a situation in which an excessive current suddenly flows into the battery 53 and causes damage thereof.

  This effect will be described in detail. The additional battery device 50 is generally attached to the uninterruptible power supply 10 in which the battery 19 is kept fully charged by receiving power from a commercial AC power supply. For this reason, the battery 53 of the additional battery device 50 is charged after being charged to the same level as the battery 19 of the uninterruptible power supply 10 in a fully charged state, so that when the battery 53 is attached to the uninterruptible power supply 10, Consideration is made so that there is no difference in charge level between the battery 19 and the battery 53. However, the attachment to the uninterruptible power supply 10 may be attempted in a state where the level of charging of the battery 53 of the additional battery device 50 is reduced due to the influence of factors such as time-lapse factors after shipment. In such a case, an excessive current that causes damage to the battery 53 flows from the battery 19 of the uninterruptible power supply 10 having a high voltage to the battery 53 of the additional battery 50 having a low voltage.

  On the other hand, if the first electromagnetic switch 54 is switched off through the control by the control unit 58 and the second electromagnetic switch 55 is switched on, the batteries 19 and 53 are connected. The current flowing from the battery 19 of the power failure power supply device 10 to the battery 53 of the additional battery device 50 passes through the current limiting circuit 56. As a result, electric energy is slowly stored in the battery 53 until the potential difference between the positive electrode and the negative electrode reaches the same level as the voltage applied from the battery 19 without causing damage to the battery 53.

  Further, when the level of charge of the battery 53 exceeds the threshold with the storage, the first electromagnetic switch 54 is switched on and the second electromagnetic switch 55 is switched off through control by the control unit 58, The battery 19 of the uninterruptible power supply 10 and the battery 53 of the additional battery device 50 are connected without going through the current limiting circuit 56. Then, after the switching, the voltage of the battery 53 follows the fluctuation of the voltage of the battery 19 of the uninterruptible power supply 10. In addition, when the DC voltage applied from the uninterruptible power supply 10 due to a power failure becomes lower than the potential difference between the positive electrode and the negative electrode of the battery 19 and the stored electric energy is discharged as a DC voltage, the DC voltage corresponds to the DC voltage. The current flows into the uninterruptible power supply 10 through the first diode 88, and the supply of alternative power to the load device is supported by the additional battery device 50.

(Second Embodiment)
A second embodiment of the present invention will be described below with reference to the drawings. The additional battery device 50 according to the first embodiment limits the current flowing into the battery 53 by the current limiting circuit 56 while the charging level of the battery 53 of the own device is below a preset threshold value. It has become. In contrast, in the present embodiment, the additional battery device 50A receives a signal indicating the level of charge of the battery 19 from the uninterruptible power supply 10A, and the battery 19 of the uninterruptible power supply 10A and the battery 53 of the own device 53 While the difference in charge level is larger than the threshold value, the current limiting circuit 56 limits the current flowing into the battery 53 of the device itself.

  FIG. 2 is a diagram illustrating a schematic hardware configuration of the uninterruptible power supply 10A according to the present embodiment and the additional battery device 50A connected to the uninterruptible power supply 10A. The same or similar members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified. The uninterruptible power supply 10A according to the present embodiment includes a power receiving terminal 11, a power feeding terminal 12, a power failure detection relay 13, a first circuit breaker 14, a second circuit breaker 15, an AC switch 16, a converter 17, an inverter 18, a battery 19, In addition to the control unit 20 and the extension connector 21, a voltage detection circuit 33 is provided. The voltage detection circuit 33 detects a charge level corresponding to the potential difference between the positive electrode and the negative electrode of the battery 19 and supplies a signal indicating the level to the control units 20 and 58 via the signal line 44.

  Further, the extension connector 21 of the uninterruptible power supply 10A has one end of a signal line 44 connected to the voltage detection circuit 33 and the control unit 20, and one end of two power lines 42 and 43 connected to the positive electrode and the negative electrode of the battery 19, respectively. In addition, it is exposed from a hole provided in the surface of the housing, and has a structure in which a male engagement member is provided around the hole.

  As in the first embodiment, the additional battery device 50A according to the present embodiment includes a first connector 51, a second connector 52, a battery 53, a first electromagnetic switch 54, a second electromagnetic switch 55, and a current limiting circuit 56. , A voltage detection circuit 57, a control unit 58, a start switch 59, a first diode 88, and a second diode 89. Among these parts, the first connector 51 exposes one end of the signal line 70 connected to the control unit 58 from one of the two power lines 60 and 61 from the hole on the surface of the housing, and a female type connector around the exposed one. It has a structure with a joint member. On the other hand, the second connector 52 exposes the other end of the signal line 70 extending from the first connector 51 to itself through another hole on the surface of the housing together with the other ends of the two power lines 60 and 61, It has a structure in which a male engagement member is provided. The first connector 51 and the second connector 52 correspond to “receiving means” in the claims.

  Therefore, when the extension battery device 50A is attached to the uninterruptible power supply 10A, when the first connector 51 and the extension connector 21 of the uninterruptible power supply 10A are connected, the power lines and the signal lines of both are connected. Is done. Also, when the additional battery device 50A is connected in series and the first connector 51 is connected to the second connector 52 of the installed additional battery device 50A, both power lines and signal lines are connected. Is done.

  When the start switch 59 is turned on, the controller 58 switches the first electromagnetic switch 54 off and switches the second electromagnetic switch 55 on. Then, the additional battery device 50A is attached to the uninterruptible power supply 10A in that state. When an attempt is made to attach the battery 53 of the additional battery device 50A to the uninterruptible power supply 10A in a state where the level of charging of the battery 53 is lowered, the additional battery is connected from the battery 19 of the uninterruptible power supply 10A simultaneously with the connection of both connectors Current flows into device 50A. However, even in such a case, the first electromagnetic switch 54 is turned off and the second electromagnetic switch 55 is turned on by switching immediately after the start switch 59 is turned on. The current passes through the current limiting circuit 56. As described above, the electric energy is gradually stored without passing through the current limiting circuit 56 without causing damage to the battery 53.

  Further, the control unit 58 determines the level of charge indicated by the signal supplied from the voltage detection circuit 33 of the uninterruptible power supply 10A via the signal lines 44 and 70 connected by the connector connection, and the voltage detection circuit of the own device. The difference in the level of charge indicated by the signal supplied from 57 is specified. And while the difference in charge level is larger than the threshold value, the first electromagnetic switch 54 is switched off and the second electromagnetic switch 55 is switched on. On the other hand, when the difference in charge level becomes smaller than the threshold value, the first electromagnetic switch 54 is switched on and the second electromagnetic switch 55 is switched off.

  The additional battery device 50 </ b> A according to the present embodiment described above does not determine the necessity of current limitation based on the magnitude relationship between the charging level of the battery 53 of the own device and the threshold value, but the battery 53 of the own device. Based on the magnitude relationship between the difference in the level of charge of the battery 19 of the uninterruptible power supply 10A and the threshold value, the necessity of current limitation is determined. In this way, by limiting the current flowing into the battery 53 of the additional battery device 50A by determining the necessity of limiting the current in consideration of the actual measurement value of the charge level of the battery 19 of the uninterruptible power supply 10A, The release timing can be accurately identified. When the start switch 59 is turned on, the difference between the charge level of the battery 19 of the uninterruptible power supply 10A and the battery 53 of the additional battery device 50A is compared with the threshold value. The first electromagnetic switch 54 may be turned on from off, and the second electromagnetic switch 55 may be turned on from off when exceeding or exceeding the threshold value.

(Third embodiment)
A third embodiment of the present invention will be described below with reference to the drawings. The additional battery device 50 </ b> A according to the first embodiment and the second embodiment is equipped with a control unit 58, and the control unit 58 determines the necessity of limiting the current flowing into the battery 53. On the other hand, in this embodiment, instead of mounting the control unit 58 in the additional battery device 50B, the uninterruptible power supply 10B receives a signal indicating the charge level of the battery 53 from the additional battery device 50B, While the difference between the charge levels of the battery 19 of the own device and the battery 53 of the additional battery device 50B is larger than the threshold value, the current limiting circuit 56 limits the current flowing into the battery 53.

  FIG. 3 is a diagram illustrating a schematic hardware configuration of the uninterruptible power supply 10B according to the present embodiment and the additional battery device 50B connected to the uninterruptible power supply 10B. The same or similar members as those in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified. As in the second embodiment, the uninterruptible power supply 10B according to this embodiment includes a power receiving terminal 11, a power feeding terminal 12, a power failure detection relay 13, a first circuit breaker 14, a second circuit breaker 15, an AC switch 16, and a converter. 17, an inverter 18, a battery 19, a control unit 20, an extension connector 21, and a voltage detection circuit 33.

  Further, the additional battery device 50B according to the present embodiment includes a first connector 51, a second connector 52, a battery 53, a first electromagnetic switch 54, a second electromagnetic switch 55, a current limiting circuit 56, a voltage detection circuit 57, A first diode 88 and a second diode 89 are included. Unlike the first embodiment and the second embodiment, the additional battery device 50B according to the present embodiment is not equipped with the control unit 58 and the start switch 59. The first connector 51 and the second connector 52 are connected by two power lines 60 and 61 and two signal lines 70 and 80. One of the two signal lines 70 is connected to the voltage detection circuit 57. The other signal line 80 branches on the way from the first connector 51 to the second connector 52, one branched signal line 81 to the first electromagnetic switch 54, and the other signal line 82 to the second connector. Each is connected to the electromagnetic switch 55. Further, an inverting circuit 83 is inserted in the signal line 82 leading to the second electromagnetic switch 55. Therefore, the first electromagnetic switch 54 and the second electromagnetic switch 55 are turned on and off each time the signal supplied via the signal lines 45 and 80 changes from one of the high level and the low level to the other. Switch reciprocally. The first connector 51 and the second connector 52 correspond to “transmission / reception means” in the claims.

  The additional battery device 50B according to the present embodiment is shipped with the first electromagnetic switch 54 turned off and the second electromagnetic switch 55 turned on. Then, the additional battery device 50B is attached to the uninterruptible power supply 10B in that state.

  When the first battery connector 51 and the expansion connector 21 of the uninterruptible power supply 10B are connected when the additional battery apparatus 50B is attached to the uninterruptible power supply 10B, the voltage detection circuit 57 of the additional battery apparatus 50B detects it. A signal indicating the level of charge of the battery 53 is supplied to the control unit 20 of the uninterruptible power supply 10B through the signal lines 70 and 45 connected by the connection.

  Upon receiving the signal from the voltage detection circuit 57 of the additional battery device 50B, the control unit 20 differs between the charge level indicated by the signal and the charge level indicated by the signal supplied from the voltage detection circuit 33 of the own device. Is identified. And while the difference in charge level is larger than the threshold value, the first electromagnetic switch 54 is switched off and the second electromagnetic switch 55 is switched on. On the other hand, when the difference in charge level becomes smaller than the threshold value, the first electromagnetic switch 54 is switched on and the second electromagnetic switch 55 is switched off. This switching is performed by switching the signal supplied to the additional battery device 50B via the signal line 44.

  The additional battery device 50B according to the present embodiment described above does not include the control unit 58, and the uninterruptible power supply device 10B has a difference in charge level between the battery 19 of the own device and the battery 53 of the additional battery device 50B and a threshold value. Whether there is a current limit is determined based on the magnitude relationship between In this way, instead of causing the uninterruptible power supply 10B to control whether or not the current is limited in the additional battery device 50B, a configuration is adopted in which the control unit 58 that would normally perform the control is not mounted in the additional battery device 50B. Thus, it is possible to provide the additional battery device 50B that guarantees safe mounting to the uninterruptible power supply 10B regardless of the level of charge of the battery 53 at a low cost.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and various modifications can be made.

  In the additional battery devices 50, 50A, 50B according to the first, second, and third embodiments, the power line 60 from the positive electrode of the battery 53 to the first connector 51 branches into two, and one of the branched power lines 60 The second electromagnetic switch 55 and the current limiting circuit 56 are respectively inserted in the first electromagnetic switch 54 and the other. Then, the first electromagnetic switch 54 and the second electromagnetic switch 55 are turned on and off in a reciprocal manner, or one of them is appropriately turned on to flow into the battery 53 from the first connector 51. The current limiting by the current limiting circuit 56 is controlled. On the other hand, a two-input changeover switch is inserted into the power line 60 extending from the positive electrode of the battery 53 to the first connector 51 instead of the first electromagnetic changer 54 and the second electromagnetic changer 55, and the two-input changeover switch A current limiting circuit 56 may be inserted in one of the branched power lines 60. Further, the power line 61 extending from the negative electrode to the first connector 51 instead of the positive electrode of the battery 53 may be branched into two.

  The additional battery devices 50, 50A, 50B according to the first, second, and third embodiments are different from the first connector 51 that is connected to the expansion connector 21 of the uninterruptible power supply 10, 10A, 10B. The additional battery devices 50, 50A, 50B are connected to the first connector 51, and a plurality of additional battery devices 50, 50A, 50B are connected to the uninterruptible power supply devices 10, 10A, 10B. Can be installed. On the other hand, you may take the structure which has only one connector connected with the connector 21 for expansion of the uninterruptible power supply 10,10A, 10B. The maintenance bypass 31 and the automatic bypass 32 of the uninterruptible power supply 10, 10A, 10B may be omitted.

  The battery 53 of the additional battery devices 50, 50A, 50B according to the above embodiment is a lithium ion secondary battery. , Nickel / zinc batteries, silver oxide / zinc batteries, redox / flow batteries, zinc / chlorine batteries, zinc / bromine batteries, aluminum / air batteries, sodium / sulfur batteries, lithium / iron sulfide batteries, etc. .

  In the above embodiment, the present invention is applied to the additional battery devices 50, 50A, 50B of the so-called single-phase input / output uninterruptible power supply devices 10, 10A, 10B. In contrast, the present invention is also applicable to an additional battery device of a three-phase input / output type uninterruptible power supply. Moreover, a battery of a specific model may be mounted on the additional battery devices 50, 50A, 50B.

It is a figure which shows the hardware schematic structure of the uninterruptible power supply device and extension battery apparatus concerning 1st Embodiment of this invention. It is a figure which shows the hardware schematic structure of the uninterruptible power supply device and expansion battery apparatus concerning 2nd Embodiment of this invention. It is a figure which shows the hardware schematic structure of the uninterruptible power supply device and extension battery apparatus concerning 3rd Embodiment of this invention.

Explanation of symbols

10, 10A, 10B ... uninterruptible power supply, 50, 50A, 50B ... additional battery device (corresponding to "power storage device"), 11 ... power receiving terminal, 12 ... power supply terminal, 13 ... power failure detection relay, 14 ... first cutoff 15 ... second circuit breaker, 16 ... AC switch, 17 ... converter, 18 ... inverter, 19,53 ... battery (corresponding to "power storage means"), 20, 58 ... control unit ("current limiting means") 21 ... extension connector, 30, 42, 43, 44, 45, 60, 61, 62 ... power line, 31 ... maintenance bypass, 32 ... automatic bypass, 33, 57 ... voltage detection circuit ("detection means") , 40, 70, 71, 72, 73, 80, 81, 82... Signal line, 51... First connector (corresponding to “terminal”, “reception means”, “transmission / reception means”), 52. 2 connectors, 54 ... 1st electromagnetic switching , 55 ... second electromagnetic switching device, (corresponding to a part of the "limiting device") 56 ... limiting circuit, 59 ... starting switch, 83 ... inversion circuit

Claims (3)

A terminal,
Power storage means connected by the terminal and a power line, and stored based on a voltage applied via the power line;
Detecting means for detecting the magnitude of the voltage of the power storage means;
Means inserted in a power line connecting the terminal and the power storage means, and when the magnitude of the voltage detected by the detection means satisfies a predetermined condition, from the terminal to the power storage means via itself. A current limiting means for suppressing the flowing current;
A power storage device comprising: Receiving means for receiving a signal indicating a voltage of a power source of a device connected to the terminal;
Further comprising
The current limiting means is
When the difference between the magnitude of the voltage detected by the detection means and the magnitude of the voltage indicated by the received signal is greater than a threshold value, the current flowing from the terminal to the power storage means via the terminal is suppressed to a predetermined value or less. ,
The power storage device according to claim 1. A transmission / reception means for transmitting a signal indicating the magnitude of the voltage detected by the detection means to an external device, and receiving a signal designating whether or not to suppress current from the device;
Further comprising
The current limiting means is
When the transmission / reception means receives a signal instructing current suppression, the current flowing from the terminal to the power storage means via the terminal is suppressed to a predetermined value or less.
The power storage device according to claim 1.

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