Uninterruptible power supply device

Abstract

To provide an uninterruptible power supply device capable of securing a desired output power even in cold conditions.SOLUTION: An uninterruptible power supply device comprises: a battery; a heater disposed so as to be in thermal contact with the battery; a first temperature sensor for measuring the temperature of the battery; and a control module for controlling the heater. When a first temperature detected by the first temperature sensor is equal to or lower than a first threshold, the control module causes the heater to heat the battery.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an uninterruptible power supply device.

Background Art

[0002] An uninterruptible power supply device is used to protect electronic devices during a power outage or the like. Some uninterruptible power supply devices are equipped with a heater inside the housing (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In cold weather, the output current of the lithium-ion battery included in the uninterruptible power supply device may decrease. In such a case, there is a risk that the desired output power cannot be ensured for electronic devices or the like connected to the uninterruptible power supply device.

[0005] One aspect of the disclosed technology aims to provide an uninterruptible power supply device that can ensure the desired output power even in cold weather.

Means for Solving the Problems

[0006] One aspect of the disclosed technology is exemplified by the following uninterruptible power supply device. This uninterruptible power supply device includes a battery, a heater arranged to be in thermal contact with the battery, a first temperature sensor for measuring the temperature of the battery, and a control module for controlling the heater. The control module causes the heater to heat the battery when a first temperature detected by the first temperature sensor is equal to or lower than a first threshold value.

[0007] According to the present uninterruptible power supply device, the battery is heated by the heater in cold weather when the first temperature measured by the first temperature sensor is equal to or lower than a first threshold value. Therefore, a decrease in the output current of the battery in cold weather is suppressed. As a result, the present uninterruptible power supply device can secure a desired output power even in cold weather when the temperature is equal to or lower than the first temperature.

[0008] The present uninterruptible power supply device may further have the following features. It further includes a second temperature sensor for measuring the temperature of the heater. When the first temperature is equal to or lower than the first threshold value and the second temperature detected by the second temperature sensor is less than a second threshold value, the control module causes the battery to be heated by the heater. When the second temperature is equal to or higher than the second threshold value, the control module suppresses the heating of the battery by the heater. In the present uninterruptible power supply device, when the second temperature detected by the second temperature sensor is equal to or higher than the second threshold value, the heating of the battery by the heater is stopped, so overheating of the heater is suppressed. As a result, heating of the battery by the heater can be realized more safely.

[0009] The present uninterruptible power supply device may further have the following features. After the control module causes the battery to be heated by the heater, when the first temperature becomes equal to or higher than a third threshold value that is greater than the first threshold value, the control module stops the heating of the battery by the heater. Here, the third threshold value is appropriately determined based on the temperature range in which the output current of the battery does not decrease. By having such a feature, the present uninterruptible power supply device suppresses overheating of the heater in the temperature range where the output current does not decrease, thereby reducing the power consumption of the present uninterruptible power supply device. Further, suppressing overheating of the heater in the temperature range where the output current does not decrease can suppress deterioration of the battery. Note that "the output current does not decrease" does not mean that the output current does not decrease at all. A decrease in the output current is allowed as long as a desired output power for electronic devices or the like connected to the uninterruptible power supply device can be secured.

[0010] The uninterruptible power supply device may further have the following features. The control module includes a first cutoff element and a second cutoff element disposed on the current path to the heater, a first control unit connected to the first temperature sensor and the first cutoff element, and a second control unit connected to the second temperature sensor and the second cutoff element. When the first temperature is equal to or lower than the first threshold value, the first control unit allows the current flowing through the current path to pass through the first cutoff element, and when the first temperature becomes equal to or higher than a third threshold value greater than the first threshold value after allowing the current to pass through the first cutoff element, the first control unit cuts off the current in the first cutoff element. When the second temperature is less than the second threshold value, the second control unit allows the current to pass through the second cutoff element. By having such features, the uninterruptible power supply device can stop the supply of current to the heater by the other one even when either the first control unit or the second control unit fails to operate due to a malfunction or the like. Therefore, according to the uninterruptible power supply device, the heating by the heater can be more reliably stopped.

[0011] The uninterruptible power supply device may further have the following features. It further includes a connection terminal to which an external battery is connected. When the control module detects that the external battery is connected to the connection terminal, it suppresses the heating of the battery by the heater even if the first temperature is equal to or lower than the first threshold value. When the external battery is connected, the uninterruptible power supply device can supply power to an electronic device or the like from each of the battery and the external battery. That is, the output current to the electronic device or the like can be distributed between the battery and the external battery. Therefore, even if the output current of the battery decreases, the desired output power to the electronic device can be ensured. By having such features, the uninterruptible power supply device can reduce the power consumption of the uninterruptible power supply device by suppressing the heating by the heater when the output current can be distributed between the battery and the external battery.

Advantages of the Invention

[0012] According to the disclosed technology, it is possible to provide an uninterruptible power supply device that can ensure a desired output power even in cold weather.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0014] <Application Example> An application example of the present invention will be described. The UPS main body 1 according to the application example includes, for example, a control module 110, a battery 120, and a heater 130 as illustrated in FIG. 3. The battery 120 is provided with a temperature sensor 121 for measuring the temperature of the battery 120 (see FIG. 4). The battery 120 and the heater 130 are arranged so as to be in thermal contact. The battery 120 and the heater 130 may be physically in contact.

[0015] The control module 110 controls the heating of the battery 120 by the heater 130. When the temperature detected by the temperature sensor 121 is equal to or lower than the first threshold value, the control module 110 causes the heater 130 to heat the battery 120. The first threshold value is determined in advance based on, for example, the temperature range in which the output current of the battery 120 decreases. By having such a feature, the UPS main body 1 can suppress a decrease in the output current of the battery 120 while suppressing overheating by the heater 130. As a result, the UPS main body 1 can ensure a desired output power even in cold weather.

[0016] <Embodiment> Hereinafter, embodiments will be described with reference to the drawings. FIGS. 1 and 2 are diagrams showing an example of the UPS main body 1 according to the embodiment. FIG. 1 illustrates the front - side appearance of the housing 10 of the UPS main body 1, and FIG. 2 illustrates the back - side appearance of the housing 10 of the UPS main body 1.

[0017] The UPS main body 1 is a device that supplies power from a battery built into the UPS main body 1 to an electronic device such as a personal computer connected to the outlet 11 when a failure such as a power outage occurs in the commercial power supply. The UPS main body 1 is used, for example, for supplying power to an electronic device such as a network device outdoors, such as on a station platform. Therefore, there is a possibility that the output current of the battery 120 decreases in cold weather due to the influence of weather conditions such as temperature, wind, and solar radiation.

[0018] The UPS main body 1 is a module that controls the power supply to the electronic device and the expansion unit 2. On the front side of the housing 10 of the UPS main body 1, an operation panel 13 including various operation switches and status lamps is arranged.

[0019] On the back side of the housing 10 of the UPS main body 1, five power outlets 11, connection terminals 12, and an AC input terminal 15 are arranged. In FIG. 2, five power outlets 11 are arranged, but the number of power outlets 11 is not limited. For example, three power outlets 11 may be arranged. A commercial power supply is connected to the AC input terminal 15. The UPS main body 1 supplies the power supplied from the commercial power supply connected to the AC input terminal 15 to electronic devices such as a personal computer connected to the power outlet 11. Further, the UPS main body 1 supplies the power from the built-in battery to electronic devices such as a personal computer connected to the power outlet 11 when a failure such as a power outage occurs in the commercial power supply. An extension unit for connecting an additional battery to the UPS main body 1 is connected to the connection terminal 12. The connection terminal 12 is, for example, a terminal compliant with RS485.

[0020] FIG. 3 is a diagram showing an example of the internal configuration of the UPS main body 1 according to the embodiment. FIG. 3 is a view of the UPS main body 1 seen from the front side of the housing 10. In the UPS main body 1, a control module 110, a battery 120, and a heater 130 are provided in the housing 10.

[0021] The control module 110 controls, for example, the charging of the battery 120 from the commercial power supply connected to the AC input terminal 15 and the power supply from the battery 120 to the electronic devices connected to the power outlet 11. Further, the control module 110 controls the on / off of the heater 130. The battery 120 is, for example, a lithium-ion battery. The heater 130 generates heat by receiving power supply from the commercial power supply connected to the AC input terminal 15. The heater 130 is, for example a rubber heater in which a heating wire is arranged in a resin cover. Note that the resin adopted for the heater 130 is preferably a flame-retardant resin. The heater 130 is arranged in the housing 10 so as to be in thermal contact with the battery 120, for example. The heater 130 may be arranged in the housing 10 so as to be in physical contact with the battery 120, for example. The heater 130 is arranged, for example, between the inner surface of the housing 10 and the bottom surface of the battery 120.

[0022] Since the output current of the battery 120 decreases in cold weather, the power that can be supplied to the electronic device connected to the outlet 11 may decrease. In the present embodiment, in cold weather, the battery 120 is heated by the heater 130 to suppress the decrease in the output current of the battery 120, and thus suppress the decrease in the output power that can be supplied to the electronic device connected to the outlet 11.

[0023] Here, even when the battery 120 is heated by the heater 130, in order to operate the UPS main body 1 more safely, the following configuration is adopted in the present embodiment. FIG. 4 is a diagram schematically showing the connection of the control module 110, the battery 120, and the heater 130 in the UPS main body 1 according to the embodiment. The control module 110 includes a control unit 140 and a heater board 150. In FIG. 4, the thin lines illustrate signal lines, and the thick lines illustrate current paths. Among the thick lines, the straight lines illustrate the current paths of the AC power, and the dashed-dotted lines illustrate the current paths of the DC power.

[0024] One terminal P1 of the commercial power supply 800 is connected to the AC / DC conversion unit 152 via the relay 142 and the triac 151. The other terminal P2 of the commercial power supply 800 is connected to the AC / DC conversion unit 152 via the relay 143. The AC / DC conversion unit 152 converts the input AC power into DC. The DC power converted by the AC / DC conversion unit 152 is input to the heater 130 via the FET 153. The heater 130 generates heat based on the input power and heats the battery 120.

[0025] The heater 130 is provided with a temperature sensor 131 that outputs a detection signal according to the temperature of the heater 130. The detection signal output by the temperature sensor 131 is input to the detection unit 154. The detection unit 154 detects the temperature of the heater 130 based on the input detection signal. When the detected temperature becomes equal to or higher than a preset second threshold value, the detection unit 154 inputs a control signal to the FET 153. The second threshold value is appropriately determined, for example, to suppress overheating of the heater 130. The second threshold value is, for example, 40 degrees.

[0026] When a control signal from the detection unit 154 is input, the FET 153 cuts off the input of DC power from the AC / DC conversion unit 152 to the heater 130. When no control signal from the detection unit 154 is input, the FET 153 does not cut off the input of DC power from the AC / DC conversion unit 152 to the heater 130.

[0027] The battery 120 is provided with a temperature sensor 121 that outputs a detection signal corresponding to the temperature of the battery 120. The detection signal output by the temperature sensor 121 is input to the MCU 141. The MCU 141 detects the temperature of the battery 120 based on the input detection signal. The MCU 141 controls the relays 142, 143, and the triac 151 according to the detected temperature.

[0028] The triac 151 is a switching element that permits or cuts off the input of AC power from the commercial power supply 800 to the AC / DC conversion unit 152 according to an instruction from the MCU 141.

[0029] The MCU 141 is a microcontroller unit. The MCU 141 executes a predetermined process by executing a program stored in the storage unit.

[0030] For example, when the temperature detected based on the detection signal input from the temperature sensor 121 is equal to or lower than a first threshold value, the MCU 141 controls the relays 142, 143, and the triac 151 to permit power supply from the commercial power supply 800 to the heater 130 via the AC / DC conversion unit 152. That is, when the temperature detected based on the detection signal input from the temperature sensor 121 is equal to or lower than the first threshold value, the MCU 141 starts heating the battery 120 with the heater 130. The first threshold value is determined in advance based on, for example, the temperature range in which the output current of the battery 120 decreases. The first threshold value is, for example, 5 degrees Celsius.

[0031] Also, for example, when the temperature detected based on the detection signal input from the temperature sensor 121 is equal to or higher than a third threshold value that is greater than the first threshold value, the MCU 141 controls the triac 151 to prohibit power supply from the commercial power supply 800 to the AC / DC conversion unit 152. That is, when the temperature detected based on the detection signal input from the temperature sensor 121 is equal to or higher than the third threshold value, the MCU 141 prohibits power supply to the heater 130. For example, when the temperature detected based on the detection signal input from the temperature sensor 121 is equal to or higher than the third threshold value after the heating of the battery 120 by the heater 130 has started, the MCU 141 controls the triac 151 to prohibit power supply from the commercial power supply 800 to the heater 130. The third threshold value is determined in advance based on, for example, the temperature range in which the output current of the battery 120 does not decrease. The third threshold value is, for example, 6 degrees Celsius.

[0032] Also, for example, when the temperature detected based on the detection signal input from the temperature sensor 121 is equal to or higher than a fourth threshold value that is greater than the third threshold value, the relays 142 and 143 are cut off to prohibit power supply from the commercial power supply 800 to the triac 151 and the AC / DC conversion unit 152. The fourth threshold value is determined in advance based on, for example, the temperature range in which the battery 120 can be safely operated. The fourth threshold value is, for example, 85 degrees Celsius.

[0033] FIG. 5 is a table listing the control by the control module 110 in the UPS main body 1 according to the embodiment. In FIG. 5, the case where the first threshold value is set to 5 degrees Celsius, the second threshold value is set to 40 degrees Celsius, the third threshold value is set to 6 degrees Celsius, and the fourth threshold value is set to 85 degrees Celsius is illustrated. Also, for each of "triac", "FET", and "relay", "ON" illustrates a state in which current passes, and "OFF" illustrates a state in which passage of current is prohibited.

[0034] When the detection signal input from the temperature sensor 121 indicates 5 degrees Celsius or less, by passing current through any of the triac 151, relays 142 and 143, and FET 153, the battery 120 is heated by the heater 130. Therefore, even in cold weather when the temperature of the battery 120 drops to 5 degrees Celsius or less, a decrease in the output current of the battery 120 is suppressed. Consequently, a decrease in the output power that can supply power to the electronic device connected to the outlet 11 is suppressed. Heating of the battery 120 by the heater 130 continues, for example, until the detection signal input from the temperature sensor 121 indicates 6 degrees Celsius or more.

[0035] When the detection signal input from the temperature sensor 121 indicates 6 degrees Celsius or more, the triac 151 cuts off the current, and the heating of the battery 120 by the heater 130 ends. Since there is substantially no decrease in the output current when the temperature of the battery 120 is 6 degrees Celsius or more, power consumption by the heater 130 is suppressed.

[0036] When the detection signal input from the temperature sensor 131 indicates 40 degrees Celsius or more, the triac 151 and the FET 153 cut off the current. By cutting off the current with both the triac 151 and the FET 153, even if one of the triac 151 and the FET 153 cannot cut off the current due to some reason, the other can cut off the current.

[0037] When the detection signal input from the temperature sensor 121 indicates 85 degrees Celsius or more, since the temperature of the battery 120 is high, it is preferable to surely end the heating by the heater 130. When the detection signal input from the temperature sensor 121 indicates 85 degrees Celsius or more, any of the triac 151, relays 142 and 143, and FET 153 cuts off the current. By any of the triac 151, relays 142 and 143, and FET 153 cutting off the current, even if any of the triac 151, relays 142 and 143, and FET 153 cannot cut off the current due to some reason, the current can be cut off by other elements. Therefore, overheating of the heater 130 can be more surely suppressed.

[0038] <Operational Effects of the Embodiment> According to this embodiment, when it is cold and the detection signal input from the temperature sensor 121 is equal to or less than the first threshold value, the battery 120 is heated by the heater 130. Further, since the heater 130 is arranged so as to be in thermal contact with the battery 120, the heat from the heater 130 is efficiently transmitted to the battery 120. Therefore, even when there is a power outage of the commercial power supply 800 in cold weather, a decrease in the output current from the battery 120 is suppressed. Note that since the heater 130 is powered by the commercial power supply 800, when the power from the commercial power supply 800 is interrupted due to a power outage or the like, the heating by the heater 130 stops. However, when the power from the commercial power supply 800 is interrupted, power supply from the battery 120 to the electronic device has already started, and the battery 120 is warmed by the power supply, so a decrease in the output current is suppressed.

[0039] According to this embodiment, when the detection signal input from the temperature sensor 121 indicates a value equal to or greater than the third threshold value, the triac 151 cuts off the current, thereby ending the heating of the battery 120 by the heater 130. When the detection signal input from the temperature sensor 121 indicates a value equal to or greater than the third threshold value, it is considered that the output current of the battery 120 does not decrease. By stopping the power supply to the heater 130 when the output current does not decrease, the power consumption of the UPS main body 1 is reduced.

[0040] According to this embodiment, when the detection signal input from the temperature sensor 131 indicates a value equal to or greater than the second threshold value, the triac 151 and the FET 153 cut off the current. By cutting off the current with both the triac 151 and the FET 153, even if one of the triac 151 and the FET 153 cannot cut off the current due to some reason, the other one can cut off the current. Therefore, overheating of the heater 130 can be more reliably suppressed.

[0041] According to this embodiment, when the detection signal input from the temperature sensor 121 is equal to or greater than the fourth threshold value, all of the triac 151, the relays 142 and 143, and the FET 153 cut off the current. By cutting off the current in this way, if the current can be cut off by at least one of the triac 151, the relays 142 and 143, and the FET 153, the heating of the battery 120 by the heater 130 can be stopped. Therefore, according to this embodiment, overheating of the battery 120 can be more reliably suppressed.

[0042] <First Modification Example> In the embodiment described above, the heating by the battery 120 was controlled according to the temperatures of the battery 120 and the heater 130. In the first modification example, when an expansion unit having a battery is connected to the UPS main body 1, a configuration for stopping the heating by the heater 130 will be described. The same reference numerals are given to the components common to the embodiment, and the description thereof is omitted. Hereinafter, the first modification example will be described with reference to the drawings.

[0043] FIGS. 6 and 7 are diagrams showing an example of an uninterruptible power supply system 100 according to the first modification example. FIG. 6 illustrates the front appearance of the uninterruptible power supply system 100, and FIG. 7 illustrates the back appearance of the uninterruptible power supply system 100. The uninterruptible power supply system 100 includes a UPS main body 1 and expansion units 2A, 2B, and 2C. The expansion units 2A, 2B, and 2C are provided. When not distinguishing between the expansion units 2A, 2B, and 2C, they are also referred to as the expansion unit 2.

[0044] The expansion unit 2 is a module that expands the battery capacity of the uninterruptible power supply system 100 by being connected to the UPS main body 1. An operation panel 23A including various operation buttons and status lamps is arranged on the front side of the expansion unit 2A. Similarly, an operation panel 23B including various operation buttons and status lamps is arranged on the front side of the expansion unit 2B. Also, an operation panel 23C including various operation buttons and status lamps is arranged on the front side of the expansion unit 2C.

[0045] On the back side of the additional unit 2A, connection terminals 21A and 22A are arranged. On the back side of the additional unit 2B, connection terminals 21B and 22B are arranged. On the back side of the additional unit 2C, connection terminals 21C and 22C are arranged. When not distinguishing between connection terminals 21C and 22C, they are both referred to as connection terminals 21 and 22. The connection terminals 21 and 22 are, for example, terminals compliant with RS485.

[0046] The connection terminal 12 and the connection terminal 21A are connected by a cable 31. The connection terminal 22A and the connection terminal 21B are connected by a cable 32. The connection terminal 22B and the connection terminal 21C are connected by a cable 33. That is, the UPS main body 1 and the additional units 2A, 2B, and 2C are connected by a daisy chain. The cables 31, 32, and 33 are, for example, connection cables compliant with RS485.

[0047] FIG. 8 is a diagram showing an example of the internal configuration of the additional unit 2 according to the first modification. The additional unit 2 has a control module 201 and a battery 202. The control module 201 includes a charging circuit that controls charging from the commercial power supply to the battery 202 and a discharging circuit that controls power supply from the battery 202 to the electronic device. The control module 201 controls the discharging of the battery 202 in response to an instruction from the control module 110. The battery 202 is, for example, a lithium-ion battery.

[0048] In the uninterruptible power supply system 100, power is supplied to the electronic device from the battery 120 of the UPS main body 1 and the battery 202 of the additional unit 2. That is, in the uninterruptible power supply system 100, the output current supplied to the electronic device can be distributed among the plurality of batteries 120 and 202. As a result, even when the output current from one of the batteries 120 and 202 decreases in cold weather, the output power that can supply power to the electronic device can be ensured.

[0049] Therefore, in the first modification, when the expansion unit 2 is connected to the UPS main body 1, heating by the heater 130 is not performed even in cold weather. For such processing, for example, the MCU 141 that detects that the expansion unit 2 is connected to the connection terminal 12 of the UPS main body 1 may control the triac 151 to cut off the supply of current to the heater 130. Note that various known techniques can be applied to detect that the expansion unit 2 is connected to the connection terminal 12.

[0050] According to the first modification, when the output current supplied to the electronic device can be distributed to the plurality of batteries 120 and 202, heating of the battery 120 by the heater 130 is suppressed. Therefore, according to the first modification, it is possible to suppress the power consumption of the uninterruptible power supply system 100 while securing the power that can be supplied to the electronic device. Note that the uninterruptible power supply system 100 includes three expansion units 2, but the number of expansion units 2 is not limited to three. The number of expansion units 2 may be two or less, or may be four or more.

[0051] <Other Modifications> In the embodiment described above, the temperature sensor 131 is provided in the heater 130, but the temperature sensor 131 may be omitted. In such a case, the control module 110 may heat the battery 120 with the heater 130 when the detection signal input from the temperature sensor 121 indicates a temperature equal to or lower than the first threshold value.

[0052] In the UPS main body 1 according to the embodiment described above, the relays 142 and 143 are arranged between the commercial power supply 800 and the AC / DC conversion unit 152, but the relays 142 and 143 may be omitted from the UPS main body 1.

[0053] The embodiments and modifications disclosed above can be combined with each other.

[0054] <Appendix 1> A battery (120), A heater (130) arranged so as to be in thermal contact with the battery (120), A first temperature sensor (121) for measuring the temperature of the battery (120); A control module (110) for controlling the heater (130); and The control module (110): When the first temperature detected by the first temperature sensor (121) is less than or equal to a first threshold value, the heater (130) is caused to heat the battery (120). An uninterruptible power supply device (1). <Appendix 2> Further comprising a second temperature sensor (131) for measuring the temperature of the heater (130); The control module (110): When the first temperature is less than or equal to the first threshold value and the second temperature detected by the second temperature sensor (131) is less than a second threshold value, the heater (130) is caused to heat the battery (120); When the second temperature is greater than or equal to the second threshold value, heating of the battery (120) by the heater (130) is suppressed. The uninterruptible power supply device (1) according to claim 1. <Appendix 3> The control module (110): After the heater (130) has heated the battery (120), when the first temperature becomes greater than or equal to a third threshold value that is greater than the first threshold value, heating of the battery (120) by the heater (130) is stopped. The uninterruptible power supply device (1) according to Appendix 1. <Appendix 4> The control module (120): A first cutoff element (142, 143, 151) and a second cutoff element (153) disposed on the current path to the heater (130); A first control unit (141) connected to the first temperature sensor (121) and the first cutoff element (x142, 143, 151); A second control unit (154) connected to the second temperature sensor (131) and the second cutoff element (153); and includes The first control unit (141): When the first temperature is less than or equal to the first threshold value, allow the current flowing through the current path to pass through the first cutoff elements (142, 143, 151). After allowing the current to pass through the first cutoff elements (142, 143, 151), when the first temperature becomes greater than or equal to a third threshold value that is greater than the first threshold value, cut off the current flowing through the first cutoff elements (142, 143, 151). When the second temperature is less than or equal to the second threshold value, the second control unit (154) allows the current to pass through the second cutoff element (153). The uninterruptible power supply device (1) according to appended note 2. <Appended note 5> Further comprising connection terminals (12) to which an external battery (202) is connected. When the control module (110) detects that the external battery (202) is connected to the connection terminals (12), even if the first temperature is less than the first threshold value and the second temperature is less than or equal to the second threshold value, suppress the heating of the battery (120) by the heater (130). The uninterruptible power supply device according to any one of appended notes 1 to 4.

Explanation of reference numerals

[0055] 1 ··· UPS main body 2 ··· Expansion unit 2A ··· Expansion unit 2B ··· Expansion unit 2C ··· Expansion unit 10 ··· Housing 11 ··· Outlet 12 ··· Connection terminal 13 ··· Operation panel 14 ··· USB terminal 15 ··· AC input terminal 21 ··· Connection terminal 21A ··· Connection terminal 21B ··· Connection terminal 21C ··· Connection terminal 22 ··· Connection terminal 22A ··· Connection terminal 22B ··· Connection terminal 22C ·· Connection terminal 31 ·· Cable 32 ·· Cable 33 ·· Cable 34 ·· USB cable 41 ·· USB terminal 100 ·· Uninterruptible power supply system 110 ·· Control module 120 ·· Battery 121 ·· Temperature sensor 130 ·· Heater 131 ·· Temperature sensor 140 ·· Control unit 141 ·· MCU 142 ·· Relay 143 ·· Relay 150 ·· Heater board 151 ·· Triac 152 ·· AC / DC conversion unit 153 ·· FET 154 ·· Detection unit 800 ·· Commercial power supply

Claims

1. A battery, a heater arranged to be in thermal contact with the battery, a first temperature sensor for measuring the temperature of the battery, and a control module for controlling the heater, wherein the control module causes the heater to heat the battery when a first temperature detected by the first temperature sensor is equal to or lower than a first threshold value, An uninterruptible power supply device.

2. further comprising a second temperature sensor for measuring the temperature of the heater, wherein the control module causes the heater to heat the battery when the first temperature is equal to or lower than the first threshold value and a second temperature detected by the second temperature sensor is lower than a second threshold value, and suppresses heating of the battery by the heater when the second temperature is equal to or higher than the second threshold value, The uninterruptible power supply device according to claim 1.

3. wherein the control module stops heating of the battery by the heater when the first temperature becomes equal to or higher than a third threshold value which is higher than the first threshold value after the heater has heated the battery, The uninterruptible power supply device according to claim 1.

4. wherein the control module includes a first cutoff element and a second cutoff element arranged on a current path to the heater, a first control unit connected to the first temperature sensor and the first cutoff element, and a second control unit connected to the second temperature sensor and the second cutoff element, wherein the first control unit allows a current flowing through the current path to pass through the first cutoff element when the first temperature is equal to or lower than the first threshold value, and cuts off the current from passing through the first cutoff element when the first temperature becomes equal to or higher than a third threshold value which is higher than the first threshold value after allowing the current to pass through the first cutoff element, wherein the second control unit allows the current to pass through the second cutoff element when the second temperature is lower than the second threshold value, and cuts off the current from passing through the second cutoff element when the second temperature is equal to or higher than the second threshold value, The uninterruptible power supply device according to claim 2.

5. further comprising connection terminals to which an external battery is connected, wherein the control module suppresses heating of the battery by the heater even when the first temperature is equal to or lower than the first threshold value when it detects that the external battery is connected to the connection terminals, The uninterruptible power supply device according to any one of claims 1 to 4.

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