JP2011160551A - Charging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact, lightweight charging device in which a power unit is separated from a terminal unit to ensure stable placement of a battery pack at charging operation. <P>SOLUTION: The charging device includes a battery pack connection unit 10 having an insertion hole for connecting the battery pack connection unit 10 to a battery pack 20, a power adaptor 1 having a bayonet plug 3a, and a cord 5 connecting the battery pack connection unit 10 to the power adaptor 1. The power adaptor 1 has an AC voltage converter. The battery pack connection unit 10 has a rectifying circuit which rectifies converted alternating current, a current cutoff circuit which controls supply and cutoff of current to a connection terminal 25 of the battery pack 20, and a charge completion detecting circuit which detects the completion of charging of the battery pack 20 and controls the current cutoff circuit. The battery pack connection unit 10 is configured to be lighter in weight than the battery pack 20, and the battery pack connection unit 10 is to be attached, so that the battery pack connection unit 10 can be mounted on top of the battery pack 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a charging device for charging a battery pack used as a drive source of a cordless electric tool.

  Generally, a charging device includes a power transformer circuit (primary circuit) for stepping down or boosting an AC voltage or a DC voltage applied from a power cord, a circuit board on which various circuits are mounted, and a case for housing these. . A mounting hole for mounting a battery pack to be charged is formed in the case. Here, the circuit board applies the voltage transformed by the power transformer circuit (primary circuit) to the battery terminal via the charging terminal, allows a charging current to flow through the battery pack, monitors the battery voltage during charging, etc. A charging circuit (secondary circuit) that detects charging and performs charging control such as stopping charging based on the detection result is provided.

  By the way, since the charging device may be used outdoors, water may enter inside during charging of the battery pack. As a countermeasure against this water leak, Patent Document 1 is provided with a discharge port for discharging the water that has entered the main body case, and the water transmitted from the mounting hole to the inside of the case is discharged from the discharge port that opens to the bottom to the outside. is doing.

JP 2009-178011 A

  As a charging device, a device having a case larger than the battery pack to be mounted as in Patent Document 1 is provided, while a small and lightweight charging device is also required in terms of portability and weight. Therefore, the inventors have studied the size and weight of the charging device, but if the floor area is reduced by reducing the size of the main body case of the charging device, the weight of the battery mounted from the upper side is heavy, There arises a problem that the stability of the charging device during charging deteriorates. Moreover, when the charging device is not in an upright state but in a state where it is laid down sideways, it becomes troublesome to remove the battery pack, resulting in poor operability. Further, it has been found that when used outdoors, there is a problem that water easily enters from the battery pack, the charging device, and the connecting portion when the charging device falls down sideways.

  The present invention has been made in view of the above background, and an object of the present invention is to provide a charging device that achieves a reduction in size and weight.

  Another object of the present invention is to provide a charging device that stabilizes the placement of a battery pack during charging by separately configuring a power supply unit and a terminal unit.

  Still another object of the present invention is to provide an easy-to-use charging device that can easily attach a battery pack to a terminal portion of the charging device.

  The characteristics of representative ones of the inventions disclosed in the present application will be described as follows.

  According to one aspect of the present invention, a battery pack connecting portion having an insertion hole for connecting to a battery pack, a power adapter portion having an insertion plug for connecting to a power outlet, a power adapter portion, and a battery pack A charging device having a cord for connecting a connecting portion, wherein the power adapter portion has a power supply voltage converter that converts a supplied AC voltage into a low AC voltage, and the battery pack connecting portion converts the converted AC A battery pack having a rectifying circuit for rectification, a current interruption circuit for controlling supply and interruption of current to a charging terminal of the battery pack, and a charge completion detection circuit for detecting completion of charging of the battery pack and controlling the current interruption circuit; The connecting portion was mounted so as to cover the insertion portion protruding from the battery pack. The battery pack connection part is housed in the upper case, the lower case that forms the housing of the battery pack connection part together with the upper case, the insertion hole for connecting to the battery pack is formed, and the upper case And a substrate on which a rectifier circuit, an electrode for connecting to a connection terminal of the battery pack, and a charge completion detection circuit are mounted.

  According to another aspect of the present invention, the volume of the battery pack connection portion is configured to be smaller than the volume of the battery pack to be mounted, and the weight of the battery pack connection portion is configured to be lighter than the weight of the battery pack to be mounted. The battery pack connection portion is configured by a plane whose upper surface and lower surface are parallel so that the battery pack connection portion can be placed in either an upward direction or a downward direction. And the hole for draining was provided in the upper surface and lower surface of a battery pack connection part.

  According to still another feature of the present invention, the upper and lower surfaces of the battery pack connecting portion and the concave portion for winding the cord around the side surface connecting the battery pack connecting portion are formed, and the insertion hole is formed at a position overlapping the concave portion. It was configured as follows. A stopper portion for stopping the cord is formed in the concave portion so that the concave portion acts as a cord reel.

  According to still another aspect of the present invention, a battery pack connecting portion having a recess for inserting a battery pack insertion portion, a cord connected to the battery pack connecting portion, a cord connected to the cord, and a power outlet It has an insertion plug for connection, and the battery pack connection portion is configured to be mounted so as to cover the insertion portion of the battery pack. The battery pack has an insertion portion provided with a terminal, and the battery pack connection portion is mounted so as to cover the five directions of the terminal. The length of the battery pack in the front-rear direction is configured to be larger than the length of the battery pack connection portion. Moreover, in the state which inserted the battery pack connection part in the insertion part which protrudes from a battery pack, the drain hole is provided in the surface facing the battery pack of a battery pack connection part.

  According to the invention of claim 1, the charging device is composed of a battery pack connection part and a power adapter part, a power supply voltage converter is arranged in the power adapter part, and only other circuits are arranged in the battery pack connection part, Since the battery pack connecting portion is configured to be mounted on the insertion portion protruding from the battery pack, the charging device can be reduced in size and weight. Moreover, since the battery pack connection portion is shaped so as to cover the insertion portion of the battery pack from above, the water resistance when exposed to rain or the like can be significantly improved.

  According to the invention of claim 2, since the battery pack connecting portion is constituted by the upper case and the lower case having the insertion hole for mounting the battery pack, it is possible to reduce the manufacturing cost and realize a charging device that is easy to assemble. .

  According to the invention of claim 3, since the volume of the battery pack connecting portion is configured to be smaller than the volume of the battery pack to be mounted, the battery pack connecting portion can be stably held on the battery pack.

  According to the invention of claim 4, since the weight of the battery pack connection portion is configured to be lighter than the weight of the battery pack to be mounted, the battery pack connection portion can be stably held on the battery pack.

  According to the invention of claim 5, the battery pack connection portion is constituted by parallel surfaces of the upper surface and the lower surface so that the battery pack connection portion can be placed in either the upward direction or the downward direction. The battery pack can be attached to the battery pack connecting portion with one hand.

  According to the invention of claim 6, since the drain holes are provided on the upper surface and the lower surface of the battery pack connecting portion, even if water enters the case of the battery pack connecting portion, it can be effectively discharged to the outside. .

  According to the invention of claim 7, the upper and lower surfaces of the battery pack connecting portion and the concave portion for winding the cord around the side surface connecting these are formed, and the insertion hole is formed at a position overlapping the concave portion. When charging, it is necessary to cancel the winding of the cord 5, and it is possible to prevent charging while the cord is wound.

  According to the eighth aspect of the present invention, since the stopper portion for stopping the cord is formed in the concave portion, the wound cord can be easily held.

  According to the invention of claim 9, since the battery pack connecting portion is mounted so as to cover the insertion portion of the battery pack, the water resistance when exposed to rain or the like can be greatly improved.

  According to the invention of claim 10, since the length of the battery pack in the front-rear direction is larger than the length of the battery pack connection part, it is difficult to fall down in the front-rear direction with the battery pack connection part connected to the battery pack. Charging can be performed in a stable state.

  According to the invention of claim 11, since the drain hole is provided in the surface of the battery pack connecting portion facing the battery pack, the water that has entered the battery pack connecting portion is more effective than the lower case by gravity. Discharged to the outside.

  According to the invention of claim 12, since the battery pack has the insertion portion provided with the terminal, and the battery pack connection portion covers the five directions of the terminal, the battery pack has five methods on the side surface and the upper surface. Since the connection portion covers from above, it is difficult for rain to occur, and the durability of the charging device and the battery pack can be improved.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

It is an external view of the charging device which concerns on this invention. It is the side view which looked at the battery pack connection part 10 of FIG. 1 from the A direction. It is the side view which looked at the battery pack connection part 10 of FIG. 1 from the B direction. It is sectional drawing of the CC section of FIG. FIG. 2 is a diagram showing a state where the battery pack connection unit 10 is mounted on the battery pack 20, and the battery pack connection unit 10 is shown in a cross-sectional view. It is the front view which looked at the battery pack connection part 10 of FIG. 1 from the D direction. 3 is a top view of the battery pack connection unit 10. FIG. It is a circuit block diagram of the charging device which concerns on the Example of this invention. FIG. 6 is a diagram for explaining a procedure for mounting the battery pack connection unit 10 to the battery pack 20 (No. 1). FIG. 6 is a diagram for explaining a procedure for mounting the battery pack connection unit 10 to the battery pack 20 (No. 2). FIG. 6 is a diagram for explaining a procedure for mounting the battery pack connection unit 10 to the battery pack 20 (No. 3).

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same portions are denoted by the same reference numerals, and repeated description is omitted. In the present application, the vertical direction of the adapter unit 1 of the charging device will be described as indicating the direction described in the drawing.

  FIG. 1 is an external view of a charging device according to the present invention. The charging device according to the present invention includes an adapter unit 1, a battery pack connection unit 10, and a cord 5 for transmitting power from the adapter unit 1 to the battery pack connection unit 10. The adapter unit 1 includes a housing 2, a pair of plugs 3 a that protrude from the housing 2 and are inserted into a commercial power outlet, and a grounding electrode 3 b that is provided at a predetermined distance from the plug 3 a. Is done. The adapter unit 1 includes a known transformer that is a power supply voltage converter for extracting a low-voltage AC voltage from a high-voltage AC voltage. The adapter unit 1 shown in FIG. 1 shows what is plugged into, for example, an AC 230V outlet, but this charging device is used for the shape of the plug 3a and the grounding electrode 3b and the presence or absence of the grounding electrode 3b. What is necessary is just to comprise according to a national outlet shape.

  Although the cord 5 is shown in a state of being bundled with the binding tool 6 in FIG. 1, the cord 5 is used with the binding tool 6 removed when charging, and the total length of the cord 5 is about 1.5 m, for example. Become. A resin bushing 4 for protecting the cord 5 is provided at a joint portion of the cord 5 with the adapter portion 1. Similarly, a resin bushing 7 is provided at a joint portion of the cord 5 with the battery pack connection portion 10. Here, the bushing is a member for fixing the cord to the through hole of the housing or the case and protecting it from pulling or twisting.

  The battery pack connection portion 10 is a portion that covers the insertion portion where the electrode portion of the battery pack is provided like a cap. In FIG. 1, the battery pack connection portion 10 is shown in a state viewed from the bottom side. The battery pack connection unit 10 is provided with two connection terminals, that is, a plus terminal 15a and a minus terminal 15b for rectifying the electric power fed from the adapter unit 1 by the cord 5 and supplying it to a battery pack (not shown). A battery mounting hole 12a having an oval cross section when viewed from below is formed on the bottom surface of the battery pack connecting portion 10 and substantially in the vicinity of the center.

  The battery mounting hole 12a is a part into which a later-described battery pack insertion part is inserted. Two terminals separated by a distance of the battery mounting hole 12a are provided with a T terminal 16a for identifying the type of battery and an S terminal 16b for battery temperature detection. In addition, a guide rib 17 extending in the vertical direction is formed at a specific location on the circumference of the battery mounting hole 12a, and a battery pack having a specific recess corresponding to the guide rib 17 (usually according to voltage and battery type). Only different) can be attached to the battery pack connector 10. In the charging apparatus according to the present embodiment, the charging apparatus is reduced in weight and cost by not only corresponding to a plurality of output voltages but corresponding only to a battery pack of 12V, for example.

  At a plurality of locations around the bottom surface of the lower case 12, minute drain holes 12 f for discharging moisture that has entered the inside of the battery pack connector 10 are formed. What is necessary is just to determine suitably the magnitude | size of this drain hole 12f, and the position provided so that an internal water | moisture content can be discharged | emitted. Further, the number of drain holes 12f is only two on one side in the example of FIG. 1, but any other number may be used.

  FIG. 2 is a side view of the battery pack connection portion 10 of FIG. 1 as viewed from the A direction. The casing of the battery pack connection unit 10 is configured to be divided into two vertically from the dividing surface, and the upper case 11 and the lower case 12 are fixed by two screws 19 (see FIG. 1). The upper case 11 and the lower case 12 are manufactured by molding a synthetic resin such as plastic, for example, and a battery mounting hole 12 a is formed on the bottom surface of the lower case 12. Concave portions 11b whose outer shape is recessed in a stepped shape are formed between the flat surface portions 11c of the upper case 11 and in the side surface portions. Similarly, the bottom surface 12c and the side surface of the lower case 12 are formed with recesses 12b whose outer shape is dented and recessed in steps. The recesses 11b and 12b serve as reel portions for winding the cord 5 when the charging device is not used. In addition, ribs 14 are formed on one side of the recesses 11b and 12b, and the gaps between the ribs 14 and the stepped surfaces of the recesses 11b and 12b are formed almost equal to the width of the cord 5, and the cord 5 is placed in this gap. It can hold | maintain so that the cord 5 wound by pinching may not loosen. In the example of FIG. 2, since the cord 5 is pulled out from the rear side of the recesses 11b and 12b and the bushing 7 is sandwiched between the dividing surfaces of the upper case 11 and the lower case 12, the rib 14 is positioned in front of the recesses 11b and 12b. Provided on the side. The ribs 14 extend from the upper case 11 and the lower case 12, and the upper case 11 portion and the lower case 12 portion are each formed by integral molding.

  FIG. 3 is a side view of the battery pack connector 10 of FIG. 1 as viewed from the B direction. Here, the side surface viewed from the A direction shown in FIG. 2 and the side surface viewed from the B direction shown in FIG. 3 are symmetrical except for the presence or absence of the cord 5 and the bushing 7 and can be understood to have substantially the same shape. Let's go. In FIG. 3, the battery mounting hole 12 a is positioned on the bottom surface 12 c of the lower case 12, and has a positional relationship overlapping with the recess 12 b. Therefore, when the cord 5 is used by being wound around the recesses 11b and 12b, the cord 5 is wound so as to straddle the opening of the battery mounting hole 12a. Therefore, since it is necessary to cancel the winding of the cord 5 whenever charging is performed, it is possible to prevent charging while the cord is wound.

  4 is a cross-sectional view taken along a line CC in FIG. It should be noted that the CC line in FIG. 1 is not a straight line, but is a cross section passing through the screw 19 near the center. The upper case 11 and the lower case 12 are divided vertically by a substantially horizontal dividing surface. A substrate 18 for mounting an electric circuit element is provided in the upper case 11. The board 18 is a substantially square circuit board as viewed from above, and is supplied with AC power supplied by the cord 5, and also includes a plus terminal 15a and a minus terminal 15b (not shown) for supplying DC power to a battery pack to be described later. , And a T terminal 16a and an S terminal 16b. In the lower case 12, a battery mounting hole 12a into which the insertion part of the battery pack is inserted is formed. The battery mounting hole 12a has a long cylindrical shape substantially the same as the outer shape of the insertion part of the battery pack. As can be understood from this figure, the recess 12b of the lower case 12 is configured to be about 80% of the opening 12d portion of the battery mounting hole 12a. A ceiling surface 12e is formed in the upper part of the battery mounting hole 12a, and the upper end of the insertion part of the battery pack is configured to abut against the ceiling surface 12e. At the time of this contact, the plus terminal 15a, the minus terminal 15b, the T terminal 16a, and the S terminal 16b are in good contact with the corresponding connection terminals on the battery pack side.

  FIG. 5 is a diagram illustrating a state in which the battery pack connection unit 10 is mounted on the battery pack 20, where the battery pack 20 is a side view and the battery pack connection unit 10 is a cross-sectional view. The battery pack 20 accommodates battery cells (not shown) in a case in a horizontal orientation and a vertical orientation, and is arranged so that the shape when viewed from the side is substantially L-shaped. When the battery pack 20 is mounted on the power tool, the battery pack 20 is housed so that the insertion portion 22 of the battery pack 20 enters the inside of the housing of the power tool (not shown), and the remaining portion, that is, the main body portion 21 is stored in the power tool. It is attached in a state exposed to the outside from the housing. In addition, although the front-back direction shown with the arrow in a figure shows the back-and-front direction of the battery pack connection part 10 and the battery pack 20, the length of the front-back direction of the battery pack 20 is the said battery pack connection part 10 from this figure. It will be understood that the length is much longer than the length of the method before and after.

  FIG. 6 is a front view of the battery pack connecting portion 10 and shows a portion viewed from the direction D of FIG. From this figure, it will be understood that the width W1 of the battery pack connecting portion 10 in the left-right direction is substantially the same as the width W2 of the battery pack 20. On the front side of the battery pack connector 10, an LED 8 indicating that charging is in progress is provided, and lights up red, for example, during charging. Further, when charging is completed, the LED 8 may be turned off, or may be lit in green, for example, so as to distinguish between charging and charging completion indications by color. The position where the LED 8 is provided is not limited to the front side of the battery pack connection unit 10 but may be other side surfaces (right surface, left surface, back surface). If the LEDs are provided not on the top surface or the bottom surface but on the side surfaces as described above, the LEDs 8 are not in contact with the mounting surface even when the battery pack connection portion 10 is used downward, so that the LEDs are not easily broken. Furthermore, you may provide LED in the area | region of the recessed part 11b of the upper surface of the battery pack connection part 10. FIG. In this case, when the adapter is used downward, the LED comes to the upper surface, so that the LED can be easily confirmed. Further, the necessity of confirming the state of the LED increases the tendency of the operator to always place the installation direction of the battery pack connection unit 10 in the same direction (situation as shown in FIG. 5).

  FIG. 7 is a top view of the battery pack connector 10. The upper case 11 of the battery pack connecting portion 10 has an upper surface formed on a substantially flat surface, but a concave portion 11b serving as a reel portion for winding the cord 5 continuing from the side surface is also formed on the upper surface. Therefore, when the battery pack connection portion 10 is placed on the floor with the upper surface down, the battery pack connection portion 10 is held by the two separated flat portions 11c. In addition, a minute drain hole 11 d for discharging moisture that has entered the inside of the battery pack connection portion 10 is formed in the flat portion 11 c of the upper case 11. What is necessary is just to determine suitably the magnitude | size of this drain hole 11d so that an internal water | moisture content can be discharged | emitted. Moreover, although the number of the drain holes 11d is two in the example of FIG. 1, it is good also as another arbitrary number.

  Since the battery pack 20 used in this embodiment is formed in a substantially L shape when viewed from the side, the size (particularly the diameter) of the insertion portion 22 can be reduced, and the insertion portion 22 is accommodated. The housing diameter of the electric tool can be reduced. Further, since the battery cells are dispersedly arranged inside the insertion part 22, the main body part 21 can be formed in a small size, and an efficient battery pack arrangement can be realized. The weight of the battery pack 20 is, for example, about 380 g for the 9.6V specification, 480 g for the 12V specification, 600 g for the 14.4V specification, and about 750 g for the 18V specification. In the charging apparatus according to the present embodiment, the weight of the battery pack connecting portion 10 is less than half of the weight of the battery pack 20 and is about 130 g.

  Next, the circuit block of the charging device according to the embodiment of the present invention will be described with reference to FIG. The housing 2 of the adapter unit 1 accommodates an insertion plug 3a and a power supply voltage converter 35 connected to the insertion plug 3a. The power supply voltage converter 35 is, for example, a transformer that converts high-voltage AC power into low-voltage AC voltage. In the present embodiment, the power voltage converter 35 steps down AC230V to about AC23V. By using the transformer in this way, an alternating current with a reduced voltage can be output to the cord 5 on the secondary side of the transformer. A rectifier circuit 36 for converting low-voltage alternating current supplied by the cord 5 into direct current is mounted on the substrate 18 disposed in the battery pack connection unit 10. The rectifier circuit 36 is a known rectifier circuit using, for example, a diode bridge and a smoothing capacitor, and can be configured to be small and light. The direct current converted by the rectifier circuit 36 is supplied to the battery pack 20 via the current cutoff circuit 37.

  The current interrupt circuit 37 controls charging on or off based on a control signal from an external control circuit. In this embodiment, the current interrupting circuit 37 controls charging off based on the output of the charge completion detection circuit 38. . The charge completion detection circuit 38 can be constituted by, for example, a temperature detection circuit, and when the temperature of the battery cell in the battery pack 20 becomes equal to or higher than a predetermined temperature, the interruption signal that is a control signal to the current interruption circuit 37 as charging is completed. Is output to end charging.

  Next, with reference to FIGS. 9 to 11, a procedure for mounting the battery pack connection unit 10 in the charging apparatus according to the embodiment of the present invention will be described. The following mounting procedure does not necessarily have to be such a mounting procedure, but merely shows an example of a convenient mounting procedure.

  According to the inventors' investigation, it has been found that the initial state when the battery pack 20 according to the present embodiment is mounted on the charging device is often the state where the charging device is left on the floor. In this state, the operator removes the battery pack 20 from an electric tool (not shown) and holds it by hand. At this time, as shown in FIG. 9, the battery pack connecting portion 10 of the charging device is placed on the mounting surface 31 such as the floor or table so that the battery mounting hole 12a opens upward, that is, in an inverted state. There are many. In this inverted state, the operator holds the battery pack 20 with one hand, puts the insertion portion 22 down so that the connection terminal 25 is down, and combines the direction of the guide step 24 in the direction indicated by the arrow 41. The pack 20 can be moved.

  The operator can easily attach the battery pack 20 to the battery pack connecting part 10 with one hand by inserting the insertion part 22 of the battery pack 20 into the battery attachment hole 12a. At this time, since the lower side (upper surface) of the battery pack connection part 10 is placed on the placement surface 31, the guide step 24 can be guided by the guide rib 17 without the operator holding the battery pack connection part 10 by hand. The battery pack 20 can be attached to the battery pack connection portion 10. In addition, since the battery pack 20 is relatively heavy, the battery pack 20 can be naturally mounted by its own weight without being pushed by the operator with great force, so that it is very convenient to use. FIG. 10 shows the state after mounting in this manner. There is no problem even if charging is performed in this state, but it is preferable to perform charging in a state as shown in FIG.

  In the state of FIG. 11, since the insertion part 22 of the battery pack 20 is completely covered with the battery pack connection part 10, the opening of the battery mounting hole 12 a for insertion of the battery pack 20 faces downward, such as rain. Even if the battery pack gets wet, the battery pack connection portion 10 serves as an umbrella, and the risk of water entering the internal circuit board is greatly reduced. Moreover, since the insertion part 22 of the battery pack 20 is placed upward, there is very little possibility that the charging terminal and other connection terminals of the battery pack 20 are exposed to water. At this time, since the outer shape of the upper case 11 and the lower case 12 is determined so that the battery pack connection portion 10 protrudes like a bowl at a position indicated by 42, raindrops or the like attached to the battery pack connection portion 10 are side surfaces. Even if it falls along, the battery pack 20 falls well on the placement surface 31 without being caught.

  When charging is completed, the operator can easily remove the battery pack connection part 10 without lifting the battery pack 20 by hand by simply pulling up only the battery pack connection part 10 from the state shown in FIG. it can. This is because the battery pack 20 is sufficiently heavier than the battery pack connector 10.

  As described above, according to the present embodiment, the charging device is configured to be separated from the adapter unit 1 and the battery pack connection unit 10, so that the battery pack connection unit 10 is put on the insertion unit 22 of the battery pack 20 from above. It was possible to make such a shape. For this reason, when exposed to rain etc., water resistance could be improved significantly. Moreover, since the charging device could be reduced in size and weight, a highly portable charger could be achieved.

  As mentioned above, although this invention was demonstrated based on the Example, this invention is not limited to the above-mentioned Example, A various change is possible within the range which does not deviate from the meaning. For example, in the above-described embodiment, the AC-AC converter is accommodated in the adapter unit 1 and a low-voltage alternating current is supplied by the cord 5. A power supply voltage converter such as a DC converter may be accommodated, and a low voltage direct current may be supplied to the battery pack connection unit 10 by the cord 5.

DESCRIPTION OF SYMBOLS 1 Adapter part 2 Housing 3a Plug 3b Grounding electrode 4 Bushing 5 Cord 6 Binder 7 Bushing 10 Battery pack connection part 11 Upper case 11b Recessed part
11c Plane portion (upper side of upper case) 11d Drain hole 12 Lower case 12a Battery mounting hole 12b Recess
12c Bottom surface 12d Opening 12e Ceiling surface 12f Drain hole 14 Rib 15a Plus terminal 15b Minus terminal 16a T terminal 16b S terminal 17 Guide rib 18 Substrate 19 Screw 20 Battery pack 21 Body portion 22 Insertion portion 24 Guide step 25 Connection terminal 31 Mount Surface 35 Power supply voltage converter 36 Rectifier circuit 37 Current interrupt circuit 38 Charging completion detection circuit

Claims (12)

A battery pack connection portion having an insertion hole for connection to the battery pack;
A power adapter unit having a plug for connection to a power outlet;
A charging device having a cord for connecting the power adapter unit and the battery pack connection unit,
The power adapter unit has a power voltage converter that converts a supplied AC voltage into a low AC voltage,
The battery pack connection unit detects a completion of charging of the battery pack by detecting a completion of charging of the battery pack, a rectifying circuit that rectifies the converted alternating current, a current interruption circuit that controls supply and interruption of current to a charging terminal of the battery pack, A charge completion detection circuit for controlling the current interrupt circuit;
The battery pack connecting portion is mounted so as to cover the insertion portion of the battery pack. The battery pack connecting portion is
Upper case,
Forming the case of the battery pack connection portion together with the upper case, a lower case having an insertion hole for connecting to the battery pack,
The board is housed in the upper case and the case, and includes an electrode for connecting to the rectifier circuit and a connection terminal of the battery pack, and a board on which the charge completion detection circuit is mounted. The charging device according to 1.   The charging device according to claim 2, wherein the volume of the battery pack connection portion is configured to be smaller than the volume of the battery pack to be mounted.   The charging device according to claim 2, wherein the weight of the battery pack connection portion is configured to be lighter than the weight of the battery pack to be attached.   5. The battery pack connecting portion according to claim 1, wherein the upper surface and the lower surface are configured in parallel so that the battery pack connection portion can be placed in either an upward direction or a downward direction. The charging device described.   The charging device according to claim 5, wherein a drain hole is provided in an upper surface and a lower surface of the battery pack connection portion. Forming upper and lower surfaces of the battery pack connecting portion, and a recess for winding the cord around the side surface connecting these;
The charging device according to claim 5, wherein the insertion hole is formed at a position overlapping the concave portion.   The charging device according to claim 7, wherein a stopper portion for stopping the cord is formed in the concave portion. A battery pack connecting portion having a recess for inserting the insertion portion of the battery pack;
A cord connected to the battery pack connecting portion;
A plug that is connected to the cord and connected to a power outlet;
The battery pack connecting portion is mounted so as to cover the insertion portion of the battery pack.   The charging device according to claim 9, wherein a length of the battery pack in the front-rear direction is larger than a length of the battery pack connection portion.   11. The charging according to claim 10, wherein a drain hole is provided on a surface of the battery pack connection portion facing the battery pack in a state where the battery pack connection portion is inserted into the insertion portion. apparatus. The battery pack has an insertion part provided with terminals,
The charging device according to claim 9, wherein the battery pack connection portion is mounted so as to cover five directions of the terminal.

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