Charging device and charging system

Abstract

To provide a charger and a charging system which can cool a battery pack provided with no opening for cooling.SOLUTION: In a charger 1, a cooling air duct definition part 22 is provided at a position facing a battery pack 100 attached to a battery pack attachment part 10 of the surface of the battery pack attachment part 10. The cooling air duct definition part 22 defines a cooling air duct connected with an intake port 17 and a slot part 103 of the battery pack 100 in a state of attaching the battery pack 100 to the battery pack attachment part 10. A fan 14 is constituted to draw in the air in the battery pack 100 via a drain hole 106 and the slot part 103 of the battery pack 100, and the cooling air duct definition part 22 of the charger 1.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a charging device and a charging system.

Background Art

[0002] Battery packs are widely used as power sources for electric devices such as electric work machines. The battery pack is configured to be removable from the electric device and rechargeable with a charging device. The charging device of Patent Document 1 below has a wind window so as to face the opening of the battery pack in order to exhaust or intake the wind of its own fan, and is configured to cool the battery pack through the wind window. On the other hand, as shown in Patent Document 2 below, there is also a battery pack that does not have an opening for internal cooling.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, when a battery pack is used in a high-output electric device, the heat generation of the battery pack is large. When the high-temperature battery pack is attached to the charging device, it enters a high-temperature standby state and charging cannot be started immediately. Further, when the battery pack becomes high temperature due to heat generation during charging, it enters a high-temperature standby state and charging is interrupted. If the time in the high-temperature standby state is long, the time until charging is completed becomes long.

[0005] An object of the present invention is to solve at least one of the following first and second problems. · First problem: To provide a charging device and a charging system capable of cooling a battery pack not provided with an opening for cooling. • Second challenge: To provide a charging device and charging system that can shorten charging time. [Means for solving the problem]

[0007] This invention be The manner is 、 A charging device to which a battery pack having a battery-side terminal portion and a slot portion that exposes the battery-side terminal portion can be attached, A battery pack mounting section into which the aforementioned battery pack can be attached, A charging device side terminal portion is provided in the battery pack mounting portion and is connectable to the battery side terminal portion, A fan that generates cooling air, The battery pack mounting section is provided with a through-hole through which the cooling air passes, A pair of guide rails are provided in the battery pack mounting section, protruding from the surface of the battery pack mounting section, and guiding the mounting of the battery pack; Equipped with, The aforementioned battery pack mounting portion In the case where the battery pack is attached The aforementioned battery pack surface Opposite this position, Formed as a recessed area from the surface of the battery pack mounting portion, Connected to the aforementioned through hole The cooling air flows between the recess and the surface of the battery pack. A cooling airflow path defining section is provided to define the cooling airflow path. ked, Characterized by It is a charging device. .

[0008] Another aspect of the present invention is a charging system. This charging system is The charging device and, A battery pack that can be attached to the battery pack mounting section and can be charged by the charging device, It is characterized by having the following features.

[0009] The "charging device" of the present invention may also be expressed as "charger" or the like, and such expressions are also valid as embodiments of the present invention. [Effects of the Invention]

[0010] According to the present invention, at least one of the first and second problems described above can be solved. [Brief explanation of the drawing]

[0011] [Figure 1] A charging system according to Embodiment 1 of the present invention, which is a configuration diagram of a charging system including a charging device 1, a battery pack 100, and an electric device main body 150. [Figure 2] (A) is a plan view of the battery pack 100. (B) is a cross-sectional view taken along the line F-F of FIG. 2(A). [Figure 3] A perspective view of the charging device 1 with the battery pack 100 mounted thereon. [Figure 4] An exploded view of the upper case 11 and the lower case 12 of the charging device 1 opened from each other. [Figure 5] A plan view of the charging device 1 with the battery pack 100 mounted thereon. [Figure 6] (A) is a cross-sectional view taken along the line A-A of FIG. 5, showing the flow of the air current generated by the fan 14. (B) is a cross-sectional view of the main part taken along the line B-B of FIG. 5, showing the flow of the air current generated by the fan 14. [Figure 7] (A) is a plan view of the main part of the charging device 1. (B) is a cross-sectional view taken along the line C-C of FIG. 7(A). [Figure 8] (A) is a plan view of the main part of the charging device 2 according to Embodiment 2 of the present invention. (B) is a cross-sectional view taken along the line D-D of FIG. 8(A). [Figure 9] (A) is a cross-sectional view of the charging device 2 with the battery pack 100 mounted thereon in FIG. 8(B), showing the flow of the air current generated by the fan 14. (B) is a front cross-sectional view of the charging device 2 with the battery pack 100 mounted thereon, showing the flow of the air current generated by the fan 14. [Figure 10] A plan view of the main part of the charging device 3 according to Embodiment 3 of the present invention. [[ID= 32]] [Figure 11] (A) is a plan view of the main part of the charging device 4 according to Embodiment 4 of the present invention. (B) is a cross-sectional view taken along the line E-E of FIG. 11(A). [Figure 12] A cross-sectional view of the charging device 4 with the battery pack 100 mounted thereon in FIG. 11(B), showing the flow of the air current generated by the fan 14. [Figure 13] A plan view of the main part of the charging device 5 according to Embodiment 5 of the present invention. [Figure 14] (A) is a plan view of the main part of the charging device 6 according to Embodiment 6 of the present invention. (B) is a cross-sectional view of GG in Figure 14(A). [Figure 15] Figure 14(B) is a cross-sectional view showing the battery pack 100 attached to the charging device 6, and illustrating the airflow generated by the fan 14. [Figure 16] A plan view of the main part of the charging device 7 according to Embodiment 7 of the present invention. [Figure 17] A side cross-sectional view of a charging system according to Embodiment 8 of the present invention, showing the airflow generated by the fan 14. [Figure 18] (A) is a side cross-sectional view of a charging system according to Embodiment 9 of the present invention, showing the airflow generated by the fan 14A. (B) is a front cross-sectional view of a charging system according to Embodiment 9, showing the airflow generated by the fan 14A. [Modes for carrying out the invention]

[0012] (Embodiment 1) Figures 1 to 7 relate to Embodiment 1 of the present invention. This embodiment relates to a charging device 1, a charging system consisting of the charging device 1 and a battery pack 100 (Figure 3), and a charging system consisting of the charging device 1, the battery pack 100, and an electrical equipment body 150 (Figure 1). In the charging system, the charging device 1 may be replaced with a charging device of another embodiment. Figures 7(A) and 7(B) define the mutually orthogonal front-to-back, up-and-down, and left-to-right directions in the charging device 1.

[0013] The charging device 1 can mount the battery pack 100 and charge the battery pack 100. As shown in Figure 1, the electrical equipment body 150 has a battery pack mounting section 151 for detachably mounting the battery pack 100, and a motor 152 as a load section that can be driven by the power of the battery pack 100. In the illustrated example, the electrical equipment body 150 is a driver drill, but it may be replaced with any other type of electrical equipment body. The battery pack 100 does not have a cooling opening, i.e., an opening that faces and communicates with the air intake 17 of the charging device 1 shown in Figure 7(A).

[0014] As shown in Figures 2(A) and (B), the battery pack 100 has an upper case 101 and a lower case 102. The upper case 101 and the lower case 102 are, for example, made of molded resin and are assembled together by screws or the like to form the case (battery-side housing) of the battery pack 100.

[0015] The upper case 101 has a slot portion 103 and a pair of left and right battery-side rail portions 108. The battery pack 100 has battery-side terminals 104 that face outward from the slot portion 103. That is, the battery-side terminals 104 are exposed outside the battery-side housing from the slot portion 103. In the illustrated example, there are five slot portions 103 and five battery-side terminals 104. A battery-side terminal 104 is housed in each slot portion 103. The battery-side rail portions 108 engage with the charging device-side rail portion 21 shown in Figure 7(A) and serve as a guide when the battery pack 100 is attached to the charging device 1.

[0016] As shown in Figure 5, the lower case 102 has drainage holes 106. The drainage holes 106 are drainage ports for draining water that has entered the inside of the case from the slot portion 103, and in the illustrated example, four are provided.

[0017] The battery pack 100 has a battery cell 105 and a battery-side circuit board 107 inside the upper case 101 and lower case 102. The battery-side circuit board 107 is equipped with battery-side terminals 104 and a protection IC (not shown).

[0018] As shown in Figure 3, the charging device 1 has an upper case 11 and a lower case 12. The upper case 11 and the lower case 12 are, for example, made of molded resin and are assembled together by screws or the like to form the case (charging device side housing) of the charging device 1. The upper case 11 and the lower case 12 each have an exhaust port 13 on their right side.

[0019] As shown in Figure 4, the charging device 1 has a fan 14 and a charging device side board 15 inside the upper case 11 and lower case 12. The fan 14 generates cooling air to cool the battery pack 100. The charging device side board 15 mounts the circuit components necessary for charging the battery pack 100. A power cord 18 extends from the rear of the lower case 12. The power cord 18 is connected to an external AC power source such as a commercial power supply. The charging device 1 charges the battery pack 100 using power supplied from the external AC power source.

[0020] As shown in Figures 7(A) and 7(B), the upper right portion of the upper case 11 is a battery pack mounting section 10 into which the battery pack 100 can be installed. The charging device 1 has four charging device-side terminals 16 on the battery pack mounting section 10. The charging device-side terminals 16 are connected to the battery-side terminals 104 and serve as pathways for charging current, communication signals, etc.

[0021] The battery pack mounting section 10 has an air intake 17, five protrusions 19, and a pair of charging device side rail sections 21 spaced apart in the left-right direction. The air intake 17 is a through-hole through which the cooling air generated by the fan 14 passes. The protrusions 19 protrude upward from the surface of the battery pack mounting section 10 and hold the charging device side terminals 16. The charging device side rail sections 21 are guide rails that guide the mounting of the battery pack 100. Between the left and right pair of charging device side rail sections 21, the five protrusions 19 are arranged spaced apart from each other in the left-right direction, with a spacing section 20 in between.

[0022] A cooling air passage defining section 22 is provided on the surface of the battery pack mounting section 10 at a position facing the battery pack 100 mounted in the battery pack mounting section 10. The cooling air passage defining section 22 defines a cooling air passage connected to the air intake 17 and the slot section 103 when the battery pack 100 is mounted in the battery pack mounting section 10. The air intake 17 connects the cooling air passage defining section 22 to the interior of the upper case 11 and the lower case 12 (charging device side housing). The cooling air passage defining section 22 is located between a pair of charging device side rail sections 21. The cooling air passage defining section 22 is connected to the separation section 20. The cooling air passage defining section 22 may extend to the front of the charging device side terminal 16.

[0023] Figures 6(A) and 6(B) show the flow of cooling air generated by the fan 14. The fan 14 is configured to draw in air from inside the battery pack 100 through the slot portion 103 and the cooling air path defining portion 22. The cooling air enters the battery pack 100 (inside the upper case 101 and lower case 102) from the drain hole 106 of the battery pack 100, flows towards the slot portion 103 while cooling the battery cells 105 and the battery-side circuit board 107, and exits the battery pack 100 (outside the upper case 101 and lower case 102) from the slot portion 103 while cooling the battery-side terminals 104.

[0024] Cooling air that exits the battery pack 100 from the slot 103 flows towards the intake port 17, passing between the surface of the battery pack mounting section 10 (cooling air path defining section 22) and the surface of the battery pack 100 (surface of the upper case 101) that faces it, and enters the charging device 1 (inside the upper case 11 and lower case 12) from the intake port 17. The cooling air that enters the charging device 1 from the intake port 17 is drawn in by the fan 14 and exhausted out of the charging device 1 (outside the upper case 11 and lower case 12) from the exhaust port 13.

[0025] Some of the cooling air comes from the front side of the protrusion 19, passes between the protrusion 19 and the surface of the battery pack 100 opposite it, or through the gap 20, merges with the cooling air that exits the battery pack 100 from the slot 103, and enters the charging device 1 through the intake port 17.

[0026] This embodiment provides the following effects and advantages.

[0027] (1) The charging device 1 has a cooling air passage defining section 22 that defines a cooling air passage connected to the air intake 17 and the slot section 103 when the battery pack 100 is mounted in the battery pack mounting section 10. Therefore, a cooling air passage is formed as the cooling air passage generated by the fan 14, passing through the air intake 17, the cooling air passage defining section 22, and the slot section 103. As a result, the battery pack 100, which does not have a cooling opening, can be cooled.

[0028] (2) Since the battery pack 100, which does not have a cooling opening, can be cooled, the time spent in the high-temperature standby state when the battery pack 100 is installed is shortened compared to when the battery pack 100 cannot be cooled. In addition, the time spent in the high-temperature standby state when the battery pack 100 becomes hot due to heat generated during charging is also shortened. By shortening the time spent in the high-temperature standby state in this way, the time until charging is complete is shortened, making it easier to use.

[0029] (3) Since the battery pack 100, which does not have cooling openings, can be charged while being cooled, the charging current can be increased and the charging speed can be improved.

[0030] (Embodiment 2) Figures 8 and 9 relate to a charging device 2 according to Embodiment 2 of the present invention. The charging device 2 replaces the cooling air passage defining portion 22 of the charging device 1 of Embodiment 1 with a cooling air passage defining portion 22A formed as a recess on the surface of the battery pack mounting portion 10. An air intake port 17 opens into the cooling air passage defining portion 22A. The cooling air passage defining portion 22A is located inside the pair of charging device side rail portions 21 in the left-right direction and extends outward in the left-right direction beyond the five protrusions 19. As shown in Figure 9(A), the cooling air passage defining portion 22A extends in the front-rear direction beyond the slot portion 103 of the battery pack 100 mounted on the battery pack mounting portion 10.

[0031] According to this embodiment, the cooling air passage defining portion 22A is formed as a recess, which increases the air passage cross-sectional area between the cooling air passage defining portion 22A and the surface of the battery pack 100 facing it. As a result, the air passage resistance between the cooling air passage defining portion 22A and the surface of the battery pack 100 facing it is reduced, the airflow of the cooling air is increased, and the cooling performance of the battery pack 100 is improved. Furthermore, because the cooling air passage defining portion 22A is formed as a recess, the cooling air that has passed through the inside of the battery pack 100 and the cooling air that has passed between the battery pack mounting portion 10 and the battery pack 100 (between the protruding portions 19) can be more easily guided to the air intake port 17.

[0032] (Embodiment 3) Figure 10 is a plan view of the main part of the charging device 3 according to Embodiment 3 of the present invention. The charging device 3 is the same as the charging device 2 of Embodiment 2 shown in Figures 8 and 9, but with the addition of guide projections 23A around the cooling air passage defining portion 22A. The guide projections 23A extend along the outer edge of the cooling air passage defining portion 22A, excluding the front edge, and protrude upward. The guide projections 23A pass to the left and right of the projection 19 and extend to the front end of the surface of the battery pack mounting portion 10. The upper end of the guide projections 23A may be in contact with the upper surface of the battery pack 100 when the battery pack 100 is mounted on the battery pack mounting portion 10.

[0033] According to this embodiment, the guide projection 23A protrudes so as to be close to the surface of the battery pack 100 facing the cooling air passage defining section 22A, thereby suppressing airflow that does not contribute to cooling the battery pack 100, such as airflow that is drawn into the intake port 17 from the left or right or rear direction without passing through the inside of the battery pack 100 or the slot section 103. As a result, the amount of cooling air that passes through the inside of the battery pack 100 and the slot section 103 is increased, and the cooling performance of the battery pack 100 is improved. In addition, leakage of cooling air from the cooling air passage defining section 22A is suppressed.

[0034] (Embodiment 4) Figures 11 and 12 relate to a charging device 4 according to Embodiment 4 of the present invention. The charging device 4 is the same as the charging device 2 of Embodiment 2 shown in Figures 8 and 9, but with an air intake port 24 added and the cooling air passage defining section 22A replaced with a cooling air passage defining section 22B.

[0035] The air intake 24 opens into the battery pack mounting section 10 in front of the air intake 17. The air intake 24 is a through-hole through which the cooling air generated by the fan 14 passes. The air intake 24 connects the cooling air passage defining section 22B with the inside of the charging device 4. The air intake 24 is located between a pair of charging device side rail sections 21.

[0036] The cooling air passage defining portion 22B is formed as a recess on the surface of the battery pack mounting portion 10. The cooling air passage defining portion 22B corresponds to the cooling air passage defining portion 22A shown in Figures 8 and 9, with the recessed portion around the air intake port 17 removed. In other words, the area in which the cooling air passage defining portion 22B exists is limited to the area in front of the air intake port 17.

[0037] As shown in Figure 12, in the front-to-back direction, the area where the air intake port 24 is located and the area where the slot portion 103 of the battery pack 100 mounted on the battery pack mounting portion 10 overlap at least partially. In the illustrated example, in the front-to-back direction, the areas where the front of the air intake port 24 is located and the rear of the slot portion 103 are located overlap. The air intake port 24 extends forward of the slot portion 103.

[0038] As shown in Figure 12, the cooling air that exits the battery pack 100 from the slot portion 103 flows towards the intake ports 17 and 24 through the space between the cooling air passage defining portion 22B and the surface of the battery pack 100 facing it, and enters the charging device 4 from the intake ports 17 and 24. The same applies to the cooling air that has come through the space between the protruding portion 19 and the surface of the battery pack 100 facing it, or through the separation portion 20. As mentioned above, since the recess that forms the cooling air passage defining portion 22B is only located in front of the intake port 17, the airflow rate of the cooling air passing through the intake port 24 is greater than the airflow rate of the cooling air passing through the intake port 17. Since the intake port 17 is located outside the recess that forms the cooling air passage defining portion 22B, the distance to the opposing battery pack is shorter compared to when it is located inside the recess. For this reason, it can be suitably used as a cooling air path for a battery pack (not shown) that has an exhaust port (cooling opening) facing and communicating with the intake port 17.

[0039] According to this embodiment, the addition of the air intake port 24 reduces airflow resistance, increases the volume of cooling air, and improves the cooling performance for the battery pack 100.

[0040] (Embodiment 5) Figure 13 is a plan view of the main part of the charging device 5 according to Embodiment 5 of the present invention. The charging device 5 is the same as the charging device 4 of Embodiment 4 shown in Figures 11 and 12, but with the addition of guide projections 23B around the cooling air passage defining portion 22B. The guide projections 23B extend along the outer edge of the cooling air passage defining portion 22B, excluding the front edge, and protrude upward. The guide projections 23B pass to the left and right of the projection 19 and extend to the front end of the surface of the battery pack mounting portion 10.

[0041] According to this embodiment, the guide projection 23B protrudes so as to be close to the surface of the battery pack 100 facing the cooling air passage definition 22B, thereby suppressing airflow that does not contribute to cooling the battery pack 100, for example, airflow that is drawn into the intake port 24 from the left or right or rear direction without passing through the inside of the battery pack 100 or the slot portion 103. As a result, the amount of cooling air passing through the inside of the battery pack 100 and the slot portion 103 is increased, and the cooling performance of the battery pack 100 is improved.

[0042] (Embodiment 6) Figures 14 and 15 relate to a charging device 6 according to Embodiment 6 of the present invention. The charging device 6 is the same as the charging device 4 of Embodiment 4 shown in Figures 11 and 12, but without the air intake port 17. In the charging device 6, the cooling air that passed through the air intake port 17 in the charging device 4 flows through the air intake port 24, as shown in Figure 15. In this embodiment, the airflow resistance is greater than in Embodiment 4 because the air intake port 17 has been removed. However, in Embodiment 4, since most of the cooling air flows through the air intake port 24, a sufficient amount of cooling air can be secured even without the air intake port 17.

[0043] (Embodiment 7) Figure 16 is a plan view of the main part of the charging device 7 according to Embodiment 7 of the present invention. The charging device 7 is the same as the charging device 6 of Embodiment 6 shown in Figures 14 and 15, but with the addition of guide protrusions 23B around the cooling air passage defining section 22B. The guide protrusions 23B have the same configuration as the guide protrusions 23B of the charging device 5 of Embodiment 5 shown in Figure 13. Similar to Embodiment 5, this embodiment also has the effect of improving the cooling performance for the battery pack 100 by using the guide protrusions 23B.

[0044] (Embodiment 8) Figure 17 is a side cross-sectional view of a charging system according to Embodiment 8 of the present invention, showing the airflow generated by the fan 14. This charging system is the same as the charging device 4 of Embodiment 4 shown in Figures 11 and 12, but with a battery pack 100A installed instead of the battery pack 100. The battery pack 100A is the same as the battery pack 100 but without the drain hole 106.

[0045] The cooling air generated by the fan 14 flows from the front of the protrusion 19, through the space between the protrusion 19 and the surface of the battery pack 100A facing it, or through the separation section 20, and towards the rear. Subsequently, a portion of the cooling air enters the battery pack 100A through the slot section 103, swirls to cool the battery cells 105, and exits the battery pack 100A through the slot section 103. The remaining cooling air passes through the slot section 103 to cool the battery-side terminals 104, and merges with the aforementioned portion of the cooling air without entering the battery pack 100A. Subsequently, the cooling air flows through the space between the cooling air path defining section 22B and the surface of the battery pack 100 facing it, towards the intake ports 17 and 24, and enters the charging device 4 through the intake ports 17 and 24.

[0046] According to this embodiment, even a battery pack 100A without a drain hole 106 can be cooled. In this embodiment, the charging device 4 may be replaced with a charging device other than that of Embodiment 4.

[0047] (Embodiment 9) Figure 18 relates to a charging system according to Embodiment 9 of the present invention. In this charging system, the charging device 4A is the same as the charging device 4 of Embodiment 4 shown in Figures 11 and 12, but with the fan 14 replaced by fan 14A. Fan 14A is equivalent to fan 14 with its direction reversed. The intake port 13A and exhaust ports 17A and 24A of the charging device 4A correspond to the exhaust port 13 and intake ports 17 and 24 of the charging device 4, but with the intake and exhaust functions reversed.

[0048] The cooling airflow generated by fan 14A in this embodiment is the reverse of the cooling airflow generated by fan 14 in Embodiment 4 shown in Figure 12. Fan 14A is configured to send air into the battery pack 100 via the cooling airflow path defining section 22B and the slot section 103.

[0049] The cooling air generated by fan 14A enters the charging device 4A through the intake port 13A, is drawn into fan 14A, and exits the charging device 4A through exhaust ports 17A and 24A. The cooling air that exits the charging device 4A flows towards the slot portion 103 of the battery pack 100, cooling the battery-side terminals 104 as it enters the battery pack 100 from the slot portion 103. The cooling air that enters the battery pack 100 flows towards the drain hole 106, cooling the battery cells 105 and the battery-side circuit board 107, and is exhausted outside the battery pack 100 from the drain hole 106. Some of the cooling air does not enter the battery pack 100, but flows forward through the space between the protruding portion 19 and the opposite surface of the battery pack 100, or through the separated portion 20.

[0050] This embodiment also achieves the same effects as Embodiment 4. The modification made in this embodiment compared to Embodiment 4, namely replacing fan 14 with fan 14A facing the opposite direction, can be applied to embodiments other than Embodiment 4.

[0051] Although the present invention has been described above using embodiments as examples, the present invention is not limited to these embodiments. Various modifications are possible to each of the matters specifically described in the embodiments within the scope of the claims.

[0052] The number of charging device-side terminals 16, protrusions 19, slots 103, battery-side terminals 104, and drainage holes 106, which are exemplified as specific numerical values ​​in the embodiment, do not limit the scope of the invention in any way and can be arbitrarily changed to suit the required specifications. [Explanation of Symbols]

[0053] 1-4, 4A, 5-7...Charging device, 10...Battery pack mounting section, 11...Upper case, 12...Lower case, 13...Exhaust port, 13A...Intake port, 14, 14A...Fan, 15...Charging device side circuit board, 16...Charging device side terminal, 17...Intake port, 17A...Exhaust port, 18...Power cord, 19...Protruding part, 20...Separated part, 21...Charging device side rail part, 22, 22A, 22B...Cooling air path defining part, 2 3A, 23B... Guide protrusion, 24... Intake port, 24A... Exhaust port, 100, 100A... Battery pack, 101... Upper case, 102... Lower case, 103... Slot section, 104... Battery side terminals, 105... Battery cell, 106... Drain hole (drain port), 107... Battery side circuit board, 108... Battery side rail section, 150... Electrical device body, 151... Battery pack mounting section, 152... Motor (load section).

Claims

1. A charging device to which a battery pack having a battery-side terminal portion and a slot portion that exposes the battery-side terminal portion can be attached, A battery pack mounting section into which the aforementioned battery pack can be attached, A charging device side terminal portion is provided in the battery pack mounting portion and is connectable to the battery side terminal portion, A fan that generates cooling air, The battery pack mounting section is provided with a through-hole through which the cooling air passes, A pair of guide rails are provided in the battery pack mounting section, protruding from the surface of the battery pack mounting section, and guiding the mounting of the battery pack; Equipped with, In the battery pack mounting portion, a cooling air passage defining portion is provided at a position facing the surface of the battery pack when the battery pack is mounted. This portion is formed as a recessed area from the surface of the battery pack mounting portion, is connected to the through hole, and defines a cooling air passage through which the cooling air flows between the recess and the surface of the battery pack. A charging device characterized by the following features.

2. A charging device according to Claim 1, The through hole opens in the recess. A charging device characterized by the following features.

3. A charging device according to claim 1, The configuration is such that air is drawn in from within the battery pack through the aforementioned slot portion and the aforementioned cooling air passage defining portion. A charging device characterized by the following features.

4. A charging device according to claim 1, The cooling air passage definition section and the slot section are configured to supply air into the battery pack. A charging device characterized by the following features.

5. A charging device according to claim 1, The charging device side terminal portion has a plurality of protrusions that protrude from the surface of the battery pack mounting portion, and a plurality of terminals that are each supported by the plurality of protrusions and connected to the battery side terminal portion. The plurality of protrusions are provided spaced apart from each other, with the separation portion in the direction in which the pair of guide rails separate, The cooling air passage defining portion is formed to be connected to the separated portion. A charging device characterized by the following features.

6. The charging device according to claim 1, A battery pack that can be attached to the battery pack mounting section and can be charged by the charging device, A charging system characterized by having the following features.

7. A charging system according to claim 6, The battery pack does not have an opening facing the through hole when installed in the battery pack mounting section. A charging system characterized by the following features.

8. The charging device according to claim 1, A battery pack that can be attached to the battery pack mounting section and can be charged by the charging device, A charging system equipped with, The battery pack is equipped with a drain port for draining water that has entered the interior through the slot. With the battery pack installed in the battery pack mounting section, the fan rotates to draw air into the battery pack from the drain port, and the air inside the battery pack is drawn into the charging device through the slot section, the cooling air passage defining section, and the through hole. A charging system characterized by the following features.

9. The charging device according to claim 1, A battery pack that can be attached to the battery pack mounting section and can be charged by the charging device, A charging system equipped with, The battery pack is equipped with a drain port for draining water that has entered the interior through the slot. With the battery pack installed in the battery pack mounting section, the fan rotates to send air from inside the charging device into the battery pack through the through-hole, the cooling air passage defining section, and the slot section, and the air is discharged outside the battery pack through the drain port. A charging system characterized by the following features.

10. A charging system according to any one of claims 6 to 9, The electrical device comprises a main body having a load section that can be driven by the power of the aforementioned battery pack. A charging system characterized by the following features.

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