WO2013027599A1

WO2013027599A1 - Power supply apparatus

Info

Publication number: WO2013027599A1
Application number: PCT/JP2012/070358
Authority: WO
Inventors: 拓郎小西; 正規古澤
Original assignee: 株式会社マキタ
Priority date: 2011-08-25
Filing date: 2012-08-09
Publication date: 2013-02-28
Also published as: DE212012000160U1; CN204045695U

Abstract

A power supply apparatus (1) is provided with: attaching sections (11, 12, 13, 14) to which a plurality of batteries can be attached; and an output apparatus, which outputs total power of the batteries attached to the attaching sections. The power supply apparatus (1) is also provided with: a control board (40) that controls the output of the power of the batteries; a cooling apparatus (60) that cools the control board; and a main body case (15) having the control board and the cooling apparatus housed therein.

Description

Power supply

The present invention relates to a power supply apparatus that can be used as a power supply for various electric devices.

In recent years, for example, mainly hand-held power tools such as screwing machines and drilling electric drills, for example, a lithium-ion battery (DC power supply) that can be repeatedly used by charging in addition to a 100 V AC power supply. Rechargeable electric tools that use a power source are becoming popular. Since the latter rechargeable electric tool does not require a long power cord to be connected to a power outlet unlike the former AC power supply type, it can obtain high workability or usability particularly outdoors. Also, if a plurality of batteries are prepared, one can be charged with a separately prepared charger while one is attached to the tool body and used as a power source. Work can be made more efficient by realizing continuous use.

However, in order to reduce the trouble of replacing with a charged battery, a power supply device capable of outputting a large amount of power by attaching a plurality of batteries in parallel has been provided. For example, Japanese Unexamined Patent Application Publication No. 2011-97766 discloses a technique related to this power supply device. According to this power supply apparatus, it is possible to realize both long-time output and high output of power by coexisting parallel connection and series connection for a plurality of batteries, and appropriately control the remaining amount of each battery. As a result, the output can be made more efficient.

The conventional power supply device includes a control board for controlling the power of each attached battery to be consumed efficiently. It is necessary to ensure that the control board is sufficiently cooled.

As one aspect of the present invention, a power supply device controls an output unit that can attach a plurality of batteries, an output device that outputs the total power of the batteries attached to the attachment unit, and an output of the battery power A control board, a cooling device for cooling the control board, and a main body case in which the control board and the cooling device are housed.

According to this, the operation control is efficiently performed by the control board so that, for example, the remaining amounts of the plurality of attached batteries do not vary. For this reason, the amount of heat generated by the control board, particularly FETs, increases. Since the control board serving as a large heat generation source is reliably and sufficiently cooled by the dedicated cooling device, it is possible to prevent malfunction of the power supply device and improve its durability.

It is a front view of the power supply device concerning the embodiment of the present invention. It is a longitudinal cross-sectional view of a power supply device. It is a front view of the power supply device in a state where a lid is opened. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3 and a remaining amount display section. FIG. 5 is a cross-sectional view of the main body of the power supply device, taken along line VV in FIG. 3. It is a whole perspective view of the rechargeable electric plane as an example of an electric tool.

Embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the power supply device 1 according to this embodiment includes a main body 10 to which four

batteries

11, 12, 13, and 14 can be attached on the front side, and a front side of the main body 10. And a lid 2 that can cover the attached battery. Since the four batteries are mounted in a line in the vertical direction on the front, the power supply device 1 has an elongated shape having a longitudinal length in the vertical direction.

The lid 2 is supported by the upper part of the main body 10 via the hinge part 3 so as to be rotatable up and down. The lid 2 can be opened by rotating upward about the hinge portion 3 and can be closed by rotating downward. When the lock lever 4 provided at the lower part of the lid 2 is hooked on the hooking claw 5 provided at the lower part of the main body 10, the lid 2 is locked in the closed position. The lock lever 4 is biased to the lock side by a compression spring 6.

Four legs 7 are provided on the lower surface of the main body 10 and the lid 2. The power supply device 1 can be installed in such a manner that the four legs 7 are grounded and stand upright in a vertical direction (longitudinal posture). In addition, a carrying handle 8 for carrying the power supply device 1 is provided on the upper portion of the main body 10. The carrying handle 8 is provided so as to be rotatable up and down around the hinge portion 3. The carrying handle 8 can be stood up and gripped by the user, and can be stored in a downward position. FIG. 2 shows a state in which the carrying handle 8 is laid down and stored, and FIG. 3 shows a state in which the carrying handle 8 is raised upward.

The legs 9 for horizontal installation are provided at the four corners of the back of the main body 10. The power supply device 1 can also be installed in a horizontal posture with the legs 9 grounded.

FIG. 3 shows the power supply device 1 with the lid 2 opened or removed. For this reason, the front of the main body 10 is visible in FIG.
On the front surface of the main body 10, four battery mounting portions 21 to 24 for mounting a battery are arranged in a line in the vertical direction. The main body 10 includes a box-shaped main body case 15 that has a back surface, a bottom surface, and the like and has an opening on the front surface side, and a pedestal portion 16 that is screwed to the main body case 15 according to the opening and forms the front surface. I have. The four battery attachment portions 21 to 24 are attached to the pedestal portion 16. FIG. 3 shows a state in which four

batteries

11, 12, 13, and 14 of the slide mounting type are mounted on the four battery mounting portions 21 to 24. In the following description, the four batteries attached in parallel in the vertical direction are referred to as a first battery 11, a second battery 12, a third battery 13, and a fourth battery 14 in order from the upper side.

The battery to be attached is used as a power source for a rechargeable electric tool 50 such as an electric plane shown in FIG. 6, and is a lithium ion battery with an output voltage of 18 V in this embodiment. The battery 11 has a plurality of cells 11b (lithium ion batteries, secondary batteries) housed in a battery case 11a, and can be repeatedly used by charging with a separate charger. As the battery itself, a known battery can be used. On the side of the battery 11, a lock claw 11c is provided for locking to a state where the battery 11 is attached to a battery attachment part 51 provided at the rear part of the tool body.

The battery attachment portions 21 to 24 all have the same slide attachment structure as the battery attachment portion 51 of the electric power tool 50. Each of the battery mounting portions 21 to 24 is provided with a pair of upper and lower slide rails 21a to 24a. Connector connecting portions 21b to 24b are disposed between the paired slide rails 21a to 24a. In FIG. 3, the battery can be attached to each of the battery attachment portions 21 to 24 by sliding the slide rails 21a to 24a laterally from left to right. Conversely, each battery can be removed from the battery mounting portions 21 to 24 by sliding from right to left in the lateral direction. By attaching the batteries to the battery attachment portions 21 to 24, the batteries are electrically connected via the connector connection portions 21b to 24b. Each of the four batteries can be individually attached and removed. When the lock claws 11c to 14c of each battery are unlocked with a fingertip against the spring biasing force, the lock is released and the battery can be removed.

The four

batteries

11, 12, 13, and 14 have mounting compatibility with respect to all the battery mounting portions 21 to 24. When the

batteries

11, 12, 13, and 14 are attached to all four battery attachment parts, the two pieces are electrically connected in parallel to achieve long-time output, and the two sets connected in parallel are connected in series to each other. Thus, an output voltage of 36V is realized. In the power supply device 1 of the present embodiment, control is performed so that at least series connection is established even when a battery is attached to any one of at least two battery attachment portions (for example, the first and second battery attachment portions 21 and 22). Thus, electric power of voltage 36V is surely output.

The power supply device 1 according to the present embodiment includes a remaining amount notification function (remaining amount notification device) for notifying the remaining amount of the attached battery. This remaining amount notification function includes an individual remaining amount display unit 30 that notifies the individual remaining amount Ze of each of the attached

batteries

11, 12, 13, and 14, and a total remaining amount that notifies the total remaining amount Zt of those batteries. This is realized by the quantity display unit 31.

As shown in FIG. 3, the former individual remaining amount display section 30 is arranged in the vicinity of the left side of each battery mounting section 21-24. Each individual remaining amount display unit 30 includes two indicator lamps 30 a attached to the pedestal unit 16. When the two indicator lamps 30a are lit or blinking as follows, the individual remaining amounts Ze of the corresponding

batteries

11, 12, 13, and 14 are individually notified. In each individual remaining amount display unit 30, both of the two indicator lamps 30a are lit in green, thereby notifying that the individual remaining amount Ze of the battery is sufficient (fully charged state). When one is lit in green and the other is lit in red, it is notified that the individual remaining amount Ze is low. When both lights in red, it is notified that the individual remaining amount Ze is insufficient and power cannot be supplied (required charging state). Further, both indicator lamps 30a blink red, thereby informing that the battery is in an error state with respect to temperature and current value.

The latter total remaining amount display part 31 is provided on the top surface of a cylindrical support column 32 having an oval cross section provided in the pedestal part 16 constituting the front surface of the main body 10. The support column 32 is provided between the second battery 12 and the third battery 13 at the approximate center in the vertical and horizontal directions of the pedestal 16. The total remaining amount display unit 31 includes five indicator lamps 35 and one operation switch 36 as shown in the figure. As the total remaining amount Zt of the four

batteries

11, 12, 13, and 14 increases, the number of indicator lamps 35 that are lit red increases. When all the five indicator lamps 35 are lit red, it is notified that the total remaining amount Zt of the

batteries

11, 12, 13, and 14 is sufficient. It is notified that the total remaining amount Zt of the

batteries

11, 12, 13, 14 has decreased due to a decrease in the number of lighting of the indicator lamps 35. When all the individual remaining amounts Ze of the four

batteries

11, 12, 13, 14 are exhausted, the total remaining amount Zt is also disappeared, and all the five indicator lamps 35 are not lit.

For example, even when all four or five indicator lamps 35 are lit and the total remaining amount Zt is sufficient, the individual remaining amount Ze of any battery may be insufficient. In this case, by confirming the individual remaining amount display unit 30, it is possible to reliably identify a battery that needs to be charged (that is, a battery in which one or both of the corresponding indicator lamps 30a are lit in red).

In this embodiment, it is possible to confirm whether or not the indicator lamp 35 that notifies the total remaining amount is lit only when the operation switch 36 is pressed. Even if the total remaining amount Zt is insufficient, the indicator lamp 35 is not lit unless the operation switch 36 is pressed. If some or all of the indicator lamps 35 are not lit even when the operation switch 36 is pressed, the user knows that the total remaining amount Zt of the four

batteries

11, 12, 13, 14 is insufficient. It will be. If all the indicator lamps 35 are turned on when the operation switch 36 is pressed, the user knows that the total remaining amount Zt of the four

batteries

11, 12, 13, and 14 is sufficient. Thus, the power consumption can be saved because the indicator lamp 35 is lit by pushing the operation switch 36 only when necessary.

In the power supply device 1 of the present embodiment, the total remaining amount display unit 31 can be visually confirmed from the outside even when the lid 2 is closed. Near the center of the lid 2, an oval window 2 a that is similar to the oval shape of the support column 32 of the total remaining amount display unit 31 is provided. When the lid 2 is closed with respect to the main body 10, the top of the support pillar 32 enters into the window 2a and is closed. Thus, the total remaining amount display unit 31 can be visually confirmed from the outside with the lid 2 closed.

As shown in FIG. 2, a control board 40 is disposed in the main body case 15. The control board 40 includes a control circuit for electrically controlling the remaining amount notification function and a power supply circuit (constituting a part of the output device) for outputting electric power of the DC voltage 36V. As shown in FIG. 4, the control board 40 is screwed along the back surface of the pedestal portion 16 via the board frame 45 in a state where the whole (both sides) is molded with the resin layer 40a.

As shown in FIG. 2, a cooling device 60 for cooling mainly the FET (field effect transistor) of the control substrate 40 is mainly provided in the main body case 15. The cooling device 60 includes an aluminum heat dissipating member 61 and a cooling fan 62 attached to the back surface of the control board 40. The heat dissipating material 61 is joined to the back surface of the control board 40 via two upper and lower mounting members 63. As shown in FIG. 4, the heat radiating member 61 includes a plurality of heat radiating fins 61 a having a rectangular flat plate shape. The heat radiating fins 61a extend in parallel with each other over the entire length of the control board 40 (the longitudinal direction of the main body 10, ie, the vertical direction in FIG. 2). As shown in FIGS. 4 and 5, the heat dissipating member 61 forms a plurality of vertical air passages 64 between two adjacent heat dissipating fins 61 a. Each ventilation path 64 is provided in a range extending over the entire length of the control board 40 in the longitudinal direction.

As shown in FIG. 2, the back surface of the main body case 15 is provided with an intake hole 15a. The intake hole 15 a is located at the upper end portion of the heat radiating member 61 and in the vicinity of the upper portion of the ventilation path 64. On the other hand, a circular fan frame portion 63a is integrally provided on the lower mounting member 63 that supports the heat radiating member 61, and the cooling fan 62 is attached to the main body case 15 via the fan frame portion 63a. It has been.

Exhaust holes 15 b to 15 b are provided below the cooling fan 62 and on the bottom surface of the main body case 15. Although the cooling fan is not attached to the upper fan frame portion 63a, in this embodiment, the upper attachment member 63 that supports the heat dissipating material 61 and the lower attachment member 63 provided with the fan frame portion 63a are also provided. Similar members are used. Thereby, the upper and lower attachment members 63 are made common.

When the cooling fan 62 rotates, as indicated by an arrow W in FIG. 2, a flow of cooling air from the intake hole 15a to the exhaust holes 15b to 15 through the heat radiating hole 63b of the mounting member 63 is generated. When the cooling air flows downward in the ventilation path 64 extending vertically, each heat radiation fin 61a efficiently radiates heat, and as a result, the control board 40 is cooled over the entire length thereof.

As shown in FIG. 1, a main switch 42 of the power supply device 1 is provided on the right surface of the main body case 15. When the main switch 42 is turned on, the cooling fan 62 rotates and the power can be output through the power cord 41. When the main switch 42 is turned off, the power supply circuit is cut off and the output of power is stopped, thereby suppressing wasteful standby power consumption.

A power supply cord 41 for power supply is drawn out from the lower part of the right side of the main body case 15, and 36 V DC power can be supplied to the external device through the power supply cord 41. As shown by a two-dot chain line in FIG. 1, the drawing position of the power cord 41 can be changed by the user to the left surface of the main body case 15. Usability of the power supply device 1 can be improved by selecting any one of the drawing positions to facilitate the handling of the power cord 41.

In this embodiment, as shown in FIGS. 1 and 2, a backpack belt (backpack belt 43) can be attached to the back surface of the main body case 15. The user can carry the power supply device 1 with both hands open by attaching the shoulder belt 43 and carrying the power supply device 1 on the back. For this reason, workability | operativity can be improved compared with the case where it carries using the carrying handle 8. FIG. Moreover, the space for work can be expanded compared with the case where the power supply device 1 is installed and used in a work place.

The back belt 43 is attached along the back surface of the main body case 15 and includes a back plate 43a that comes into contact with the back of the user when carrying the back. By attaching the back plate 43 a along the back surface of the main body case 15, the back belt 43 is attached to the power supply device 1. The back plate 43a has horizontal legs 9 in contact with the four corners thereof, and is fixed to the legs 9 with mounting screws 43b. For this reason, the back plate 43a is attached along this back surface with a gap 43c having a width corresponding to the height of the leg 9 between the back surface of the main body case 15.

This back plate 43a allows the user to carry the power supply device 1 with a gap 43c between the back and the back surface of the main body case 15. Thereby, the power supply device 1 can be carried on the back so that the back does not directly contact the back surface of the main body 10 and does not block the intake hole 15a on the back surface. For this reason, it can carry on the back without inhibiting the cooling efficiency of the cooling device 60. Further, since the outside air is always introduced into the intake hole 15a through the gap 43c during the operation of the cooling fan, the heat generated from the power supply device 1 is hardly transmitted directly to the user's back when carrying the back fan. Therefore, it does not make the user feel uncomfortable, thereby improving the usability of the power supply device 1 and the workability of the work using the power supply device 1.

As shown in FIG. 2, a relatively large vent 43d is formed in the upper portion of the back plate 43a. The vent hole 43 d is located behind the intake hole 15 a on the back surface of the main body case 15. When the cooling fan 62 is rotated, a flow of cooling air indicated by an arrow W is generated in the ventilation path 64 in the main body case 15, whereby the outside air is efficiently taken into the intake hole 15 a through the gap 43 c or the vent hole 43 d. Further, when the user carries the power supply device 1 on his / her back, the back plate 43a is applied to the back. However, a flow of outside air is generated through the back plate 43a and a slight gap between the back and the vent holes 43d. , Can improve the ventilation of the back and suppress sweating.

As described above, the power supply device 1 of the present embodiment includes the

battery attachment portions

21, 22, 23, and 24 to which the four

batteries

11, 12, 13, and 14 used as the power source of the electric tool can be attached. And an output device for outputting the total electric power of the battery attached to the attachment portion. Since the batteries are connected in parallel, power can be output for a long time. For this reason, it is possible to work efficiently even in a working environment where an AC power source such as outdoors cannot be used.

Furthermore, the power supply device 1 of the present embodiment includes a control board 40 that controls the output of battery power. For example, the operation control is efficiently performed by the control board so that the remaining amounts of the plurality of attached batteries do not vary. For this reason, the amount of heat generated by the control board, particularly FETs, increases. Therefore, the power supply device 1 further includes a cooling device 60 that cools the control board 40. The cooling device 60 includes a heat radiating member 61 having a plurality of heat radiating fins 61 a extending along the longitudinal direction of the control board 40, and the plurality of heat radiating fins 61 a have a length over almost the entire area in the longitudinal direction of the control board 40. The ventilation path 64 is formed. In addition, the cooling fan 62 generates a flow of cooling air from the vicinity of the upper end of the control board 40 to the lower end, as indicated by an arrow W in FIG. The entire control board 40 and its periphery are efficiently cooled by the cooling air flowing through the plurality of ventilation paths 64 along the longitudinal direction of the control board 40. As described above, since the control board 40 and its surroundings are reliably cooled by the cooling device 60, malfunction of the power supply device 1 and runaway control program due to heat generation can be prevented, and as a result, the durability of the power supply device 1 can be prevented. Can increase the sex.

In addition, the power supply device 1 of the present embodiment can be equipped with a shoulder belt 43 for the user to carry on the back. Therefore, the power supply device can be carried using the carrying handle 8 or carried on the back. If the user wears a back belt, the user can carry the power supply device 1 with the back belt and work with both hands open, so that work efficiency can be improved.

The back belt includes a back plate that can be attached to the main body case, and the back plate can be attached to a position where the heat radiation fin is between the back plate and the control board. When the power supply device 1 is carried on the back, a gap 43c is formed between the intake hole 15a provided on the back surface of the main body case 15 and the back plate 43a so that the outside air is efficiently introduced. Moreover, according to the gap 43c, the power supply device 1 cannot be directly pressed against the back, so that the heat generated by the power supply device 1 is suppressed from being directly transmitted to the user's back, thereby improving the usability (usability of use) of the power supply device 1. ) Can be better.

Further, the surface from which the power cord 41 is pulled out can be changed to the right side or the left side of the main body 10 in accordance with the user's dominant arm in a state where the power cord 41 is carried, or according to the demands of workability and the like. The convenience of 1 can be improved.

Further, the power supply device 1 of the present embodiment has a remaining amount notification function for notifying the remaining amount of the battery. As a means for realizing this remaining amount notification function, the power supply device 1 adds the individual remaining amount display unit 30 for notifying the remaining amount Ze of each battery attached to the battery mounting unit, and the total remaining amount of all these batteries. A total remaining amount display unit 31 for notifying Zt is provided. For this reason, the power supply device 1 can be efficiently operated while confirming not only the individual remaining amount Ze of the battery but also the remaining amount Zt that the power supply device 1 can output as a whole.

In particular, according to the illustrated embodiment, the remaining amount Ze of the battery and the total remaining amount Zt can be visually confirmed by the indicator lamp 30a of the individual remaining amount display unit 30 and the total remaining amount display unit 31, It can be confirmed at a glance by the indicator lamp 35. For this reason, even if it is a dark place, such as a nighttime, it can confirm from a distant place and the usability of the power supply device 1 can be improved at these points.

Further, the indicator lamp 35 of the total remaining amount display unit 31 can be viewed from the outside through the window 2a even when the lid 2 is closed. For this reason, even if the lid 2 is not bothered to open, the total remaining amount Zt of the battery can be confirmed instantaneously from a location away from this point, and the handleability of the remaining amount notification function is further enhanced in this respect.

Further, the operation switch 36 of the total remaining amount display unit 31 can be operated from the outside through the window 2a with the lid 2 closed. The total remaining amount display unit 31 is configured to activate the notification function by turning on the indicator lamp 35 only when the operation switch 36 is turned on. For this reason, in the state where the operation switch 36 is not turned on, the indicator lamp 35 does not light even if the remaining amount Zt is insufficient. As a result, unnecessary power consumption such as standby power when unnecessary can be eliminated, so that the battery can last longer than the configuration in which notification is made constantly.

Although the embodiments of the present invention have been described with reference to the above specific structure, it will be apparent to those skilled in the art that many alternations, improvements, and changes can be made without departing from the object of the present invention. Accordingly, embodiments of the invention may include all alterations, modifications, and changes that do not depart from the spirit and scope of the appended claims. For example, the embodiment of the present invention is not limited to the specific structure and can be modified as follows.

The number of batteries that can be attached to the power supply device 1 is not limited to four and can be arbitrarily set. In addition to the case where the

batteries

11, 12, 13, and 14 are attached to all of the four battery attachment portions 21 to 24 set in the main body 10, there are cases where the batteries are not attached to some of the battery attachment portions. Even if it exists, the power supply device 1 can be used about the battery attached, and a residual amount alerting | reporting function can be operated. The cooling fan 62 may be omitted. Even in this case, since the radiating fins 61a and the air passages 64 are provided along almost the entire region in the longitudinal direction of the control board 40, the control board 40 is reliably and efficiently cooled.

The total remaining amount display unit 31 may be provided not only at the front center of the main body 10 but also on the left and right side surfaces of the main body 10 and the lid 2, for example. The window 2a of the lid 2 can be omitted. In this case, the lid 2 can be opened and the total remaining amount display unit 31 can be visually confirmed. Furthermore, although the total remaining amount display unit 31 is configured to notify only when the operation switch 36 is turned on, the total remaining amount display unit 31 may be configured to always notify by omitting the operation switch 36. Further, the number of indicator lamps 35 provided in the total remaining amount display unit 31 for notifying the change in the total remaining amount Zt can be changed without being limited to five. For example, even with one indicator lamp, the change in the total remaining amount Zt can be notified by changing the lighting color according to the change in the total remaining amount Zt or changing the blinking cycle. Further, the total remaining amount display unit 31 may be configured to display (digital display) the remaining amount of the battery numerically instead of schematically indicating the remaining amount of the battery by the indicator lamp.

The means for notifying the remaining amount of battery Ze, Zt is not limited to the visual display unit by the

indicator lamps

30a, 35 as in the present embodiment, but for example, auditory sounds that generate sounds such as buzzer sounds, melodies, and voices. It may be natural or vibration-induced.

The main switch 42 of the power supply device 1 may be omitted, and the power switch 1 may be configured to be able to output power when at least one battery is attached to the battery attachment portion. Furthermore, the power supply apparatus 1 may be configured not only to output 36V DC power but also to output higher voltage power by using a booster circuit or the like. Moreover, it is good also as a structure which outputs alternating current power through an inverter etc. instead of direct current power, or the both.

Claims

A power supply device for outputting electric power, an attachment portion to which a plurality of batteries can be attached, an output device for outputting the total power of the batteries attached to the attachment portion, and an output control of the battery power A power supply device comprising: a control board that performs cooling; a cooling device that cools the control board; and a main body case that includes the control board and the cooling device.
2. The power supply device according to claim 1, wherein the cooling device includes a cooling fan that generates cooling air by rotation.
3. The power supply device according to claim 2, wherein the control board has an elongated shape having a longitudinal direction, and the cooling device includes a plurality of heat radiation fins extending in a longitudinal direction of the control board. The fan is located at one end in the longitudinal direction of the radiating fin, and a ventilation path through which cooling air generated by the rotation of the cooling fan flows in the longitudinal direction of the control board is formed between the adjacent radiating fins. Power supply.
The power supply device according to any one of claims 1 to 3, wherein the power supply device can be equipped with a backpack for carrying by a user on the back.
5. The power supply device according to claim 4, wherein the back belt includes a back plate that can be attached to the main body case, and the heat radiating fin is located between the back plate and the control board. A power supply device that can be attached to the back plate.
6. The power supply device according to claim 5, wherein the back plate is attached with a gap for ventilation between the main body case and the back plate.
The power supply device according to any one of claims 4 to 6, wherein a user determines whether a power cord for outputting power to an external device is pulled out from a left part or a right part of the main body case. Can be switched arbitrarily.
A power supply device for outputting electric power, an attachment portion to which a plurality of batteries can be attached, an output device for outputting the total electric power of the batteries attached to the attachment portion, and a total remaining amount of the batteries A power supply device comprising: a total remaining amount notification device that notifies the remaining amount of the battery, and an individual remaining amount notification device that individually notifies the remaining amount of each of the batteries.
9. The power supply device according to claim 8, wherein the total remaining amount notification device and the individual remaining amount notification device each include a display unit that can be visually confirmed.
10. The power supply device according to claim 9, wherein the display unit can be confirmed from the outside.
The power supply device according to any one of claims 8 to 10, wherein the total remaining amount notification device is configured to notify a remaining amount when a switch operation is performed.