JP2014072020A - Battery pack and electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack capable of discharging water intruded into the inside of a housing case to the outside of the housing case.SOLUTION: A battery pack 12 houses a battery cell 16 and is equipped with a housing case 18 capable of attaching to and detaching from an electric apparatus body. The housing case 18 includes: a bottom part 23b; a front wall 23c provided continuously to the bottom part 23b; and a ventilation port 32 penetrating through the front wall 23c. A part of the inner peripheral surface of the ventilation port 32 is provided continuously to the inner surface of the bottom part 23b.

Description

  The present invention relates to a battery pack that can be attached to and detached from an electric device main body, and an electric device having an electric device main body and a battery pack.

  Conventionally, a battery pack configured to be attachable to and detachable from an electric device is known, and an example of the battery pack is described in Patent Document 1. The battery pack described in Patent Document 1 includes a storage case and a battery pack stored in the storage case. The storage case includes an upper case and a lower case. The upper case is provided with an intake hole, and the lower case is provided with an exhaust hole. Patent Document 1 describes a charger that charges a battery pack. The charger has a main body portion and a cooling fan provided inside the main body portion.

  When the battery pack described in Patent Document 1 is placed on the main body of the charger and the battery cells of the battery pack are charged, the air flow formed by the cooling fan passes through the intake holes and enters the interior of the housing case. enter. The air that has entered the inside of the storage case takes heat of the battery cell and is discharged from the exhaust hole to the outside of the storage case. According to the battery pack described in this patent document 1, it is supposed that it can suppress that the member inside a battery cell deteriorates by cooling a battery cell.

JP 2009-289694 A

  By the way, when the battery pack is used in an environment where it gets wet, such as at a construction site or outdoors, water may enter the inside of the housing case from an intake hole or an exhaust hole.

  However, in the battery pack described in Patent Document 1, there is no description about discharging the water that has entered the inside of the housing case of the battery pack to the outside of the housing case, and water remains inside the housing case. There was a possibility.

  An object of the present invention is to provide a battery pack and an electric device that can discharge water that has entered the inside of the housing case to the outside of the housing case.

  The battery pack of the present invention is a battery pack that houses battery cells and includes a housing case that can be attached to and detached from an electric device body, the housing case being continuous with the bottom and the bottom. And a first through hole penetrating the first wall portion, and a part of the inner peripheral surface of the first through hole is adjacent to the inner surface of the bottom portion. It is characterized by being located.

  One aspect of the present invention is characterized in that the first through hole is located at a boundary portion between the bottom portion and the first wall portion.

  Another aspect of the present invention is characterized in that a second through hole is provided at a position farther from the bottom than the first through hole while penetrating the first wall portion.

  In another aspect of the present invention, the housing case includes a second wall portion provided continuously with the bottom portion and the first wall portion, and a third through hole penetrating the second wall portion. It is characterized by that.

  Another aspect of the present invention is characterized in that a part of the inner peripheral surface of the third through hole is located adjacent to the inner surface of the bottom portion.

  Another aspect of the present invention is characterized in that an opening area of the third through hole is narrower than an opening area of the first through hole.

  The battery pack of the present invention is a battery pack that houses battery cells and includes a housing case that can be attached to and detached from an electric device body, the housing case being continuous with the bottom and the bottom. It has a 3rd wall part provided and opposed to the edge part of the said battery cell, and a 4th through-hole which penetrates the said 3rd wall part, It is characterized by the above-mentioned.

  One aspect of the present invention is characterized in that a part of the inner peripheral surface of the fourth through hole is located adjacent to the inner surface of the bottom portion.

  Another aspect of the present invention is characterized in that a part of the inner peripheral surface of the fourth through-hole is positioned substantially in the same plane as the inner surface of the bottom portion.

  In another aspect of the present invention, the storage case includes a fourth wall portion provided continuously with the bottom portion and the third wall portion, and a fifth through hole penetrating the fourth wall portion. And a part of inner peripheral surface of the said 5th through-hole is located adjacent to the inner surface of the said bottom part, It is characterized by the above-mentioned.

  Another aspect of the present invention is characterized in that a sixth through hole is provided at a position farther from the bottom than the fifth through hole while penetrating the fourth wall portion.

  The battery pack of the present invention is a battery pack that houses battery cells and includes a housing case that can be attached to and detached from an electric device body, and the housing case contacts an object on which the housing case is placed. A first drainage port for discharging water inside the housing case to the outside of the housing case, and a fifth wall portion provided continuously to the bottom portion. And a part of the inner peripheral surface of the first drain outlet is located on the same plane as the inner surface of the bottom portion.

  In one aspect of the present invention, the storage case is provided with a vent hole through which air outside the storage case passes into the storage case, and passes through the vent hole. The air that has entered the interior passes through the first drain port and is discharged to the outside of the housing case.

  According to another aspect of the present invention, a sixth wall portion that is continuous with the bottom portion is provided, and a second drainage that discharges water inside the housing case to the outside of the housing case is provided on the sixth wall portion. A mouth is provided, and a part of the inner peripheral surface of the second drainage port is located on the same plane as the inner surface of the bottom portion.

  Another aspect of the present invention is characterized in that an opening area of the second drainage port is narrower than an opening area of the first drainage port.

  In another aspect of the present invention, the housing case includes a case body that houses the battery cell and has an opening, and a cover that closes the opening of the case body, the bottom and the first The 5 wall part constitutes a part of the case body, and the cover is provided with a second drainage port for discharging water inside the housing case to the outside of the housing case. To do.

  An electrical device of the present invention is an electrical device having a battery pack that houses battery cells in a housing case, and an electrical device main body to which the battery pack can be attached and detached. It has the structure described in the battery pack.

  According to the battery pack of the present invention, the water present inside the housing case flows along the inner surface of the bottom portion and is discharged from the first through hole to the outside of the housing case. Therefore, it is possible to prevent water from remaining inside the housing case.

  According to one aspect of the present invention, the water present inside the storage case flows toward the boundary between the bottom and the first wall, passes through the first through hole, and is discharged to the outside of the storage case.

  According to the other aspect of this invention, the water which exists in the inside of a storage case can also be discharged | emitted from the 2nd through-hole to the exterior of a storage case.

  According to another aspect of the present invention, water existing inside the storage case is discharged to the outside of the storage case through the third through hole.

  According to another aspect of the present invention, the water present inside the storage case flows along the inner surface of the bottom, passes through the third through hole, and is discharged to the outside of the storage case.

  According to another aspect of the present invention, when the air that has entered the inside of the housing case is discharged to the outside of the housing case via the first through hole, the flow resistance of the air can be made as small as possible. Therefore, when air is made to enter the inside of the housing case to cool the battery cell, it is possible to suppress the deterioration of the cooling performance.

  According to the battery pack of the present invention, the water present inside the storage case flows along the inner surface of the bottom and is discharged from the fourth through hole to the outside of the storage case. Therefore, it is possible to prevent water from remaining inside the housing case.

  According to one aspect of the present invention, the water present inside the storage case smoothly enters the fourth through hole from the inner surface of the bottom and is discharged to the outside of the storage case.

  According to one aspect of the present invention, the water present inside the storage case enters the fourth through hole along the inner surface of the bottom and is discharged to the outside of the storage case.

  According to the other aspect of this invention, the water which exists in the inside of a storage case can also be discharged | emitted from the 5th through-hole to the exterior of a storage case.

  According to another aspect of the present invention, water existing inside the storage case is discharged to the outside of the storage case through the third through hole.

  According to another aspect of the present invention, water existing inside the storage case flows along the inner surface of the bottom portion, and is discharged to the outside of the storage case through the sixth through hole.

  According to the battery pack of the present invention, when the storage case is placed on the object, a part of the inner surface of the first drain port is located on the same plane as the inner surface of the bottom portion. For this reason, the water which exists in the inside of a storage case moves along the inner surface of a bottom part, passes a 1st drainage port, and is discharged | emitted outside. Therefore, it is possible to prevent water from remaining inside the housing case.

  According to one aspect of the present invention, air outside the storage case enters the interior of the storage case through the vent, and the air that has entered the storage case passes through the first drainage port to the outside of the storage case. Discharged. That is, the first drain port can be shared as an air discharge port.

  According to the other aspect of this invention, the water inside a storage case can be discharged | emitted not only from a 1st discharge port but a 2nd drainage port outside.

  According to another aspect of the present invention, when the air that has entered the inside of the housing case is discharged to the outside of the housing case via the first drain port, the flow resistance of the air can be made as small as possible. Therefore, when air is made to enter the inside of the housing case to cool the battery cell, it is possible to suppress the deterioration of the cooling performance.

  According to another aspect of the present invention, when the battery pack is supported so that the cover is positioned lower than the case body, water inside the storage case can be discharged to the outside of the storage case.

  According to the electrical device of the present invention, when the storage case is placed on the object with the battery pack attached to the electrical device body, a part of the inner surface of the first drain port is located on the same plane as the inner surface of the bottom portion. Will be. For this reason, the water which exists in the inside of a storage case moves along the inner surface of a bottom part, passes a 1st drainage port, and is discharged | emitted outside. Therefore, it is possible to prevent water from remaining inside the housing case.

It is a perspective view which shows the electric tool which is an example of the electric equipment of this invention. It is a perspective view which shows an example of the battery pack of this invention. FIG. 3 is an exploded perspective view of the battery pack shown in FIG. 2. It is sectional drawing of the battery pack shown in FIG. It is sectional drawing which shows the case main body of the battery pack shown in FIGS. It is a conceptual diagram of the state which mounted the battery pack of this invention on the charger. It is a perspective view which shows the other example of the battery pack of this invention.

  Embodiments of an electric device and a battery pack according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic configuration of a power tool 10 which is an example of an electric device. The electric tool 10 includes a tool body 11 and a battery pack 12. The battery pack 12 can be attached to and detached from the tool body 11. The tool body 11 includes a casing 11a, a grip portion 11b, and a mounting portion 11c. An electric motor 13 is accommodated in the casing 11a. The electric motor 13 has an electromagnetic coil (not shown) to which electric power is supplied. A fan (not shown) that is driven by the power of the electric motor 13 is provided inside the casing 11a. The electric tool 10 is a cordless type tool to which a cord for supplying electric power to the electric motor 13 is not connected.

  Moreover, the casing 11a can attach and detach the tip tool 14. The tip tool 14 rotates or reciprocates around the axis A when power is transmitted from the electric motor 13. That is, the electric tool 10 includes an impact driver, a drill, a driver, a hammer, a hammer drill, and a hammer driver.

  A casing 11a is connected to one end of the grip portion 11b, and a mounting portion 11c is provided to the other end of the grip portion 11b. A control board (not shown) for controlling the electric motor 13 is provided in the grip portion 11b. A concave portion 11d is formed in the mounting portion 11c, and a plurality of, specifically three, tool side terminals 15 are provided in the concave portion 11d. The three tool side terminals 15 include a positive terminal, a negative terminal, and a signal terminal. The positive terminal and the negative terminal are connected to the electromagnetic coil of the electric motor 13 via a control element. The signal terminal is connected to a circuit board that controls the electric motor 13. The battery pack 12 can be attached and detached (detached) from the attachment portion 11c.

  The configuration of the battery pack 12 will be described with reference to FIGS. The battery pack 12 includes a plurality of battery cells 16, a holder 17, and a housing case 18. The battery cell 16 is a secondary battery that can be repeatedly charged and discharged. The battery cell 16 includes a lithium ion battery cell, a nickel metal hydride battery cell, a lithium ion polymer battery cell, a nickel cadmium battery cell, and the like. The battery cell 16 has a cylindrical shape, and two electrodes (not shown) are provided at both ends in the length direction of the battery cell 16. Of the two electrodes, one is a positive electrode and the other is a negative electrode.

  The holder 17 holds the plurality of battery cells 16 in parallel with each other, and the holder 17 has a role as an insulator that covers the plurality of battery cells 16. In the present specification, the plurality of battery cells 16 may be referred to as a battery cell 16 group. The holder 17 has a cylindrical shape, and the battery cell 16 group is accommodated therein. The holder 17 may have either a structure having openings at both ends or a structure having openings at one end.

  The holder 17 of this embodiment arranges four battery cells 16 in parallel to form one row, and accommodates eight battery cells 16 in two rows. Then, with four battery cells 16 as one set, two sets of battery cells 16 are individually connected in series. A first connection member (not shown) is connected to the positive electrode of the battery cell 16 located at one end of a set of four battery cells 16 connected in series. On the other hand, among the four battery cells 16 connected in series, a second connection member (not shown) is connected to the negative electrode of the battery cell 16 located at the other end.

  In the present embodiment, the connection member that electrically connects the electrodes is made of a conductive metal material. This metal material includes, in addition to copper, aluminum, and the like, a material obtained by performing nickel plating on the surface of a rolled steel sheet. Moreover, it is preferable that a connection member is plate shape. The surface of each connection member opposite to the portion in contact with the electrode is covered with an insulating member 19. Examples of the material constituting the insulating member 19 include an insulating tape or insulating sheet based on a resin film, a rubber-like elastic body, and a metal plate on which an insulating layer made of a resin material is formed. Note that the opening of the holder 17 or the gap between the insulating member 19 and the opening edge of the holder 17 can be covered with a waterproof sheet member, silicon, clay, or the like.

  Further, a circuit board 20 is attached to the outside of the body portion of the holder 17. The circuit board 20 is made of a non-conductive resin material and has a flat plate shape. A plurality of battery side terminals 21 are attached to the circuit board 20. The plurality of battery side terminals 21 are made of a conductive metal material. The plurality of battery-side terminals 21 include a charging positive terminal, a discharging positive terminal, a charging / discharging negative terminal, and four signal terminals. The first connecting member described above is connected to the positive electrode terminal for charging and the positive electrode terminal for discharging through a first lead wire (not shown). The second connecting member is connected to the charging / discharging negative terminal via a second lead wire (not shown).

  The housing case 18 is an element that houses the holder 17 that holds the plurality of battery cells 16. The storage case 18 includes a case body 23 and a cover 24 that closes the opening 23 a of the case body 23. The holder 17, the case main body 23, and the cover 24 are each configured separately from a non-conductive material. The non-conductive material includes a resin material. The case main body 23 has a bottom 23b, a front wall 23c formed continuously from the outer periphery of the bottom 23b, a rear wall 23d, and two side walls 23e. When the case main body 23 is viewed in plan, the bottom 23b is generally rectangular. The front wall 23c and the rear wall 23d are connected to two parallel sides of the bottom 23b, and are extended so as to be substantially perpendicular to the bottom 23b. That is, the front wall 23c and the rear wall 23d are substantially parallel. The two side walls 23e are connected to two parallel sides of the bottom 23b, and are extended so as to be substantially perpendicular to the bottom 23b. The two side walls 23e are substantially parallel to each other. The two side walls 23e are provided to face the end portions of the battery cells 16 in the length direction. Of the bottom 23b, the two sides connected to the front wall 23c and the rear wall 23d are different from the two sides connected to the two side walls 23e.

  Further, the front wall 23c is provided with a plurality of vent holes 31, 32 that allow the inside and the outside of the housing case 18 to communicate with each other. That is, the plurality of vent holes 31 and 32 are provided through the front wall 23c in the thickness direction. The plurality of vent holes 31 and 32 are arranged along the height direction of the battery pack 12. Here, the height direction means the vertical direction of the housing case 18 in a state where the axis A of the tool body 11 is substantially horizontal and the battery pack 12 is attached to the tool body 11. The plurality of vents 31 and 32 are passages for discharging the air inside the housing case 18 to the outside. The plurality of vent holes 31 and 32 are provided in two rows. For each row, three vents 31 are provided on the upper side in the height direction, and one vent 32 is provided at the lowest position in the height direction. That is, in the height direction of the housing case 18, the vent 31 is provided at a position farther from the bottom 23 b than the vent 31. When the front wall 23c is viewed from the front, the vents 31 and 32 may have any shape such as a rectangle, an ellipse, and a circle. A part of the inner peripheral surface of the vent 32 is provided adjacent to the inner surface of the bottom 23b. That is, a part of the inner peripheral surface of the vent 32 is provided continuously with the inner surface of the bottom 23b. That is, a part of the inner peripheral surface of the vent hole 32 is located on substantially the same plane as the inner surface of the bottom portion 23b. In the present embodiment, the part of the inner peripheral surface of the vent 32 is the lowest part in the height direction of the case body 23.

  Further, as shown in FIGS. 4 and 5, a drain port 33 is provided at a boundary portion (connecting portion) between the bottom portion 23 b and the side wall 23 e. That is, the drain port 33 is provided on the side wall 23e facing the end of the battery cell 16, and a part of the inner peripheral surface of the drain port 33 is adjacent to the inner surface of the bottom 23b. That is, a part of the inner peripheral surface of the drain port 33 and the inner surface of the bottom 23 are provided continuously. That is, a part of the inner peripheral surface of the drain port 33 and the inner surface of the bottom 23 are located on substantially the same plane. The drain port 33 penetrates the case main body 23 in the thickness direction, and the inside and the outside of the housing case 18 are connected by the drain port 33. The drainage port 33 has a structure for discharging foreign matter inside the storage case 18, such as water, to the outside of the storage case 18. The opening area of the drain port 33 is narrower than the opening area of the vent hole 32. Further, when the side wall 23e is viewed from the side, the shape of the drain port 33 may be any shape such as a quadrangle, an ellipse, and a circle. In addition, the drain port 33 may be provided in each boundary part of the two side walls 23e and the bottom part 23b.

  On the other hand, the cover 24 has a base portion 34, and a plate portion 25 and a mount portion 26 are provided on the base portion 34. The plate portion 25 has a flat plate shape that is substantially parallel to the bottom portion 23 b in a state where the cover 24 is attached to the case main body 23. The mount portion 26 protrudes upward from the plate portion 25 in a state where the cover 24 is attached to the case main body 23. On both sides of the mount portion 26, guide rails 27 used when the battery pack 12 is attached to the tool body 11 are provided. The two guide rails 27 are arranged in parallel to each other. A plurality of terminal insertion holes 28 are provided between the two guide rails 27 in the mount portion 26. The plurality of terminal insertion holes 28 penetrate in a slit shape from the inside of the housing case 18 to the outside. Further, the plurality of terminal insertion holes 28 are arranged in parallel with the guide rail 27. Further, the plurality of terminal insertion holes 28 are arranged in one row between one guide rail 27 and the other guide rail 27. Further, when the housing case 18 is viewed in a plan view with the cover 24 attached to the case body 23, a plurality of terminal insertion holes 28 are arranged directly above the plurality of battery side terminals 21.

  A window 29 is provided at the boundary between the mount portion 26 and the plate portion 25. The window 29 extends linearly in a direction substantially perpendicular to the two guide rails 27 when the cover 24 is viewed in plan. The window 29 is connected to a plurality of terminal insertion holes 28. Further, the plurality of battery side terminals 21 are inserted into the plurality of terminal insertion holes 28 in a state where the cover 24 is attached to the case body 23. Furthermore, the cover 24 is provided with a plurality of vent holes 30 that communicate the inside and the outside of the housing case 18. The plurality of vent holes 30 are provided on the opposite side of the plate portion 25 with the plurality of terminal insertion holes 28 therebetween. Further, a skirt portion 35 is provided on the outer periphery of the base portion 34. The skirt portion 35 extends from the base portion 34 at a substantially right angle. With the cover 24 attached to the case body 23, the edge of the skirt portion 35 contacts the edge of the front wall 23c and the edge of the side wall 23e.

  Further, an operation button 50 is attached to the cover 24. The operation button 50 can be rotated with the support shaft 51 as a fulcrum, and the operation button 50 is provided with a latch 52. The cover 24 is provided with a hole 53, and when the cover 24 is attached to the case body 23, a part of the latch 52 is exposed from the hole 53 to the outside of the cover 24. The mounting portion 11c is provided with a claw (not shown), and the latch 52 is engaged with the claw.

  Next, a schematic configuration of a charger for charging the battery pack 12 will be described with reference to FIG. The charger 40 has a main body 41, and a cooling fan 42 is provided inside the main body 41. The main body 41 is provided with a vent 43 through which the wind formed by the cooling fan 42 passes. Furthermore, the main body 41 is provided with a base 44 that supports the battery pack 12, and the base 44 is provided to be inclined with respect to a horizontal line (not shown). The base 44 is provided with a plurality of terminals 45, and when the battery pack 12 is placed on the base 44, the plurality of terminals 45 are connected to the plurality of battery-side terminals 21.

Next, an operation of attaching the battery pack 12 to the mounting portion 11c of the tool body 11 will be described. As shown in FIG. 1, the battery pack 12 and the tool main body 11 are brought close to each other, and the battery pack 12 is moved along the guide rail 27 to attach the battery pack 12 to the mounting portion 11 c of the tool main body 11. In the middle of attaching the battery pack 12 to the mounting portion 11c, the tool side terminal 15 is inserted into the terminal insertion hole 28 of the cover 24, and the tool side terminal 15 and the battery side terminal 21 are connected.
Then, when the latch 52 is engaged with the claw of the mounting portion 11c, the work of attaching the battery pack 12 to the mounting portion 11c is completed.

  When the electric motor 13 of the electric tool 10 rotates, the power of the electric motor 13 is transmitted to the tip tool 14. Further, a part of the power of the electric motor 13 is transmitted to a fan attached to the rotating shaft of the electric motor 13 in the casing 11a, and an air flow for cooling the electric motor 13 is formed by the rotation of the fan. Air is taken into the casing 11a from an inlet (not shown) formed in the casing 11a, and cools the electric motor 13 and the like. The air that has cooled the electric motor 13 and the like is discharged to the outside of the casing 11a from an exhaust port (not shown) formed in the casing 11a. When the electric motor 13 is a brushless motor, the inverter circuit can be cooled by providing the casing 11a with an inverter circuit that drives the brushless motor. In particular, since the inverter circuit is provided with a switching element (for example, FET) which is a control element for controlling the motor, the switching element can be efficiently cooled.

  Moreover, you may comprise so that a part of air which cools the electric motor 13 may be sent to the inside of the accommodating case 18 via the inside of the grip part 11b, the inside of the mounting part 11c, and the vent hole 30. That is, the vent 30 functions as an air inlet. The air sent to the inside of the storage case 18 passes between the holder 17 and the inner surface of the cover 24 or between the holder 17 and the inner surface of the case main body 23 and passes through the plurality of vents 31 and 32 to the storage case 18. It is discharged outside. More specifically, the air that has entered the interior of the housing case 18 passes between the holder 17 and the inner surface of the rear wall 23d, between the holder 17 and the inner surface of the bottom portion 23b, and passes through the plurality of vent holes 31 and 32. Discharged. A part of the air that has entered the inside of the housing case 18 passes between the holder 17 and the inner surface of the front wall 23 c and is discharged from the plurality of vent holes 31 and 32. As described above, the plurality of vents 31 and 32 of the case body 23 function as an air outlet. According to this configuration, when the motor control board is arranged inside the grip portion 11b, the control board can be cooled. This is particularly effective when the control board has a heat generating component (for example, a switching element).

  As described above, heat is exchanged between the air and the battery cell 16 while the air passes through the inside of the housing case 18, and the air whose temperature has risen is discharged to the outside of the housing case 18. Therefore, the battery cell 16 can be cooled in a state where the battery pack 12 is attached to the tool body 11. When the operation button 50 is pressed while the battery pack 12 is attached to the tool body 11, the latch 52 is released from the claw of the mounting portion 11c. Next, when the battery pack 12 and the tool body 11 are relatively moved in the opposite direction, the battery pack 12 can be removed from the tool body 11.

  On the other hand, the battery pack 12 removed from the tool body 11 can be placed on the base 44 of the charger 40 as shown in FIG. When the battery pack 12 is placed on the base 44, the vent 30 of the housing case 18 of the battery pack 12 is positioned at a position facing the vent 43. Here, when the cooling fan 42 of the charger 40 rotates, the wind formed by the cooling fan 42 enters the inside of the housing case 18 via the vent 43 and the vent 30. The air that has entered the inside of the storage case 18 passes between the holder 17 and the inner surface of the cover 24 or between the holder 17 and the inner surface of the case main body 23, and passes through the plurality of vents 31 and 32 to the outside of the storage case 18. To be discharged. Therefore, when the battery pack 12 is charged into the battery cell 16, the inside of the housing case 18 is cooled. In particular, the air that has entered between the rear wall 23d and the holder 17 flows along the inner surface of the bottom 23b, and then passes through the plurality of vents 31 and 32.

  In the present embodiment, a plurality of vent holes 31 and 32 are provided in front of the flow direction of the air flowing along the inner surface of the bottom 23b. Further, the drain port 33 is provided on the side in the air flow direction, and the opening area thereof is narrower than the opening area of the vent hole 32. For this reason, the distribution | circulation resistance of the air which passes the some vent holes 31 and 32 can be reduced as much as possible. That is, in the battery pack 12, the action of discharging the air inside the storage case 18 linearly toward the outside of the storage case 18 is smoothly performed. Therefore, it can suppress that the cooling performance of the battery cell 16 falls.

  By the way, the battery pack 12 is attached to the tool body 11, removed from the tool body 11, or attached to the charger 40. Possibility of entering the inside of the housing case 18 from at least one of the gap between the cover 24, the vents 30, 31, 32, the gap between the cover 24 and the latch 52, and the gap between the operation button 50 and the cover 24. There is. Foreign substances include water, dust, mud and the like. Since the electric tool 10 is a cordless type, the electric tool 10 can be used regardless of the location. That is, the electric power tool 10 is often used in a poor environment such as a dusty environment or rainy weather, such as a building demolition work site.

  On the other hand, if the battery pack 12 has a waterproof structure in which the opening of the holder 17 or the gap between the insulating member 19 and the opening edge of the holder 17 is covered with a waterproof sheet member, silicon, clay, etc. Even if water enters the inside of the case 18, it is possible to prevent short circuit between the battery cells 16, corrosion of the electrodes, and the like.

  Further, in the battery pack 12 of the present embodiment, a plurality of vent holes 31 and 32 are provided in the case body 23, and a part of the inner peripheral surface of the vent hole 32 is disposed on the same plane as the inner surface of the bottom portion 23b. ing. Here, it is assumed that the battery pack 12 is removed from the tool body 11 or the battery pack 12 is placed on the object 60 as shown in FIG. 4 with the battery pack 12 attached to the tool body 11. The object 60 is a solid such as a table, a work table, or a road. Then, the bottom 23b of the case body 23 comes into contact with the object 60, and the inner surface of the bottom 23b becomes substantially horizontal. For this reason, the water which exists in the inside of the storage case 18 flows along the inner surface of the bottom part 23b, and is discharged | emitted outside via the vent hole 32. FIG. Therefore, it is possible to prevent water from remaining inside the housing case 18. Furthermore, the short circuit of the battery cells 16 and the corrosion of the battery cells 16 can be prevented. Furthermore, since the battery pack 12 of the present embodiment has a plurality of vents 31 and 32 provided in the front wall 23c, when the battery pack 12 is placed on the object 60, the plurality of vents 31 and 32 are provided. It is not blocked by the object 60, and it is possible to prevent a decrease in drainage performance.

  Further, of the plurality of vents 31 and 32, the vent 32 serves as a passage for discharging the air inside the storage case 18 to the outside, and discharges the water inside the storage case 18 to the outside of the storage case 18. Also serves as a drain. In addition, with the battery pack 12 placed on the object 60, the battery pack 12 of the two side walls 23e is inclined such that one side wall 23e is lower than the other side wall 23e, or the bottom 23b. There is also a possibility that the two side walls 23e may incline so as to be alternately lowered with a substantially central portion of When the battery pack 12 is tilted in this way, a part of the water existing inside the housing case 18 moves along the inner surface of the bottom 23b and passes through the drain port 33 and is discharged to the outside of the housing case 18. Can do. A part of the inner peripheral surface of the drain port 33 and a part of the inner peripheral surface of the vent port 32 are arranged on the same plane as the inner surface of the bottom 23b, but the other parts are from the inner surface of the bottom 23b. May also be arranged below. That is, the drain port 33 may be provided on the side wall 23e, and the vent port 32 may be provided on the front wall 23dc. If the drain port 33 and the vent port 32 are provided adjacent (continuously) to the inner surface of the bottom portion 23b, the water inside the housing case 18 can be efficiently drained to the outside of the housing case 18. Can do.

  Next, another example of the battery pack 12 of the present embodiment will be described with reference to FIG. A drain port 36 that penetrates the skirt portion 35 of the cover 24 in the thickness direction is provided. The drain port 36 is provided at a location corresponding to the front wall 23 c in the skirt portion 35. The other configuration of the battery pack 12 shown in FIG. 7 is the same as the configuration of the battery pack 12 described above. When the battery pack 12 shown in FIG. 7 is supported by the base 44 of the charger 40 shown in FIG. 6, the cover 24 is positioned lower than the case body 23, and the cover 24 contacts the base 44. As a result, the substrate 34 is inclined with respect to a horizontal line (not shown).

  For this reason, a part of the water present inside the housing case 18 moves along the inner surfaces of the plate portion 25 and the base portion 34, and is discharged to the outside of the housing case 18 through the drain port 36. As described above, when the battery pack 12 shown in FIG. 7 is placed on the charger 40 so that the cover 24 is positioned lower than the case main body 23, the water inside the housing case 18 is discharged to the outside of the housing case 18. be able to. A part of the inner peripheral surface of the drain port 36 can also be disposed on substantially the same plane as the inner surface of the cover 24, specifically, the inner surface of the plate portion 25 or the inner surface of the base portion 34. If comprised in this way, the water which exists in the inside of the storage case 18 will flow along the inner surface of the cover 24, and it will become easy to drain to the exterior from the drain port 36 as it is. Further, in the battery pack 12 of FIG. 7, the same effects as those of the battery pack 12 described above can be obtained for the same components as those of the battery pack 12 described above.

  Here, the correspondence between the configuration described in the present embodiment and the configuration of the present invention will be described. The tool main body 11 corresponds to the electric device main body of the present invention, and the front wall 23c is the first wall of the present invention. , The fourth wall portion, and the fifth wall portion, the side wall 23e corresponds to the second wall portion, the third wall portion, and the sixth wall portion of the present invention, and the vent hole 31 corresponds to the second wall portion of the present invention. The vent hole 32 corresponds to the first through hole, the fifth through hole, and the first drain port of the present invention, and the vent hole 30 corresponds to the vent hole of the present invention. The drain port 36 corresponds to the third drain port of the present invention, and the drain port 33 corresponds to the third through hole, the fourth through hole, and the second drain port of the present invention.

  The battery pack of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof. For example, the battery pack of the present invention includes a structure that accommodates less than eight battery cells or a structure that accommodates nine or more battery cells. The electric equipment to which the battery pack of the present invention is attached and removed includes the above-described electric tool, grinder (grinding tool), sander (polishing tool), nailing machine, screw driving machine, tacker, dust collector (cleaner), blower (Fans, blowers), pumps, high pressure washers, chain saws (cutting tools), gardening tools (mowing machines, plant clippers), tillers, etc. That is, the electric device of the present invention includes a device that rotates the electric motor with the electric power of the battery pack and converts the rotational motion into at least one of the reciprocating motion and the rotational motion of the operating member. Moreover, the electric apparatus of the present invention includes a torch light (flashlight) and the like. That is, the electrical device of the present invention includes a lighting device that converts electrical energy supplied from the battery pack into light energy.

11 Tool body 12 Battery pack 16 Battery cell 18 Storage case 23b Bottom 23c Front wall 32 Vent

Claims (17)

A battery pack that contains a battery cell and has a storage case that can be attached to and detached from an electric device body,
The storage case has a bottom, a first wall provided continuously to the bottom, and a first through-hole penetrating the first wall,
A part of the inner peripheral surface of the first through hole is located adjacent to the inner surface of the bottom part.   The battery pack according to claim 1, wherein the first through hole is located at a boundary portion between the bottom portion and the first wall portion.   3. The battery pack according to claim 1, wherein a second through hole is provided at a position that penetrates the first wall portion and is further away from the first through hole than the bottom portion.   2. The storage case includes a second wall portion provided continuously with the bottom portion and the first wall portion, and a third through hole penetrating the second wall portion. The battery pack according to any one of?   The battery pack according to claim 4, wherein a part of the inner peripheral surface of the third through hole is located adjacent to the inner surface of the bottom portion.   The battery pack according to claim 4 or 5, wherein an opening area of the third through hole is smaller than an opening area of the first through hole. A battery pack that contains a battery cell and has a storage case that can be attached to and detached from an electric device body,
The housing case includes a bottom portion, a third wall portion that is provided continuously to the bottom portion and faces an end portion of the battery cell, and a fourth through hole that penetrates the third wall portion. Battery pack.   The battery pack according to claim 7, wherein a part of an inner peripheral surface of the fourth through hole is located adjacent to an inner surface of the bottom portion.   8. The battery pack according to claim 7, wherein a part of the inner peripheral surface of the fourth through hole is located substantially in the same plane as the inner surface of the bottom portion. The housing case includes a fourth wall portion provided continuously with the bottom portion and the third wall portion, and a fifth through hole penetrating the fourth wall portion,
10. The battery pack according to claim 7, wherein a part of an inner peripheral surface of the fifth through hole is located adjacent to an inner surface of the bottom portion.   11. The battery pack according to claim 10, wherein a sixth through hole is provided at a position that penetrates the fourth wall portion and is further away from the bottom portion than the fifth through hole. A battery pack that contains a battery cell and has a storage case that can be attached to and detached from an electric device body,
The storage case has a bottom portion that comes into contact with an object on which the storage case is placed, and a fifth wall portion that is continuously provided on the bottom portion,
A first drain outlet for discharging water inside the housing case to the outside of the housing case is provided in the fifth wall portion;
A part of the inner peripheral surface of the first drain outlet is located on the same plane as the inner surface of the bottom portion. The storage case is provided with a vent through which air outside the storage case passes when entering the interior of the storage case.
The battery pack according to claim 12, wherein air that has entered the interior of the housing case through the vent is discharged to the outside of the housing case through the first drain port. A sixth wall continuous to the bottom is provided;
The sixth wall is provided with a second drainage port for discharging water inside the housing case to the outside of the housing case,
14. The battery pack according to claim 12, wherein a part of the inner peripheral surface of the second drain port is located on the same plane as the inner surface of the bottom portion.   The battery pack according to claim 14, wherein an opening area of the second drain port is narrower than an opening area of the first drain port. The housing case includes a case body that houses the battery cell and has an opening, and a cover that closes the opening of the case body.
The bottom and the fifth wall constitute a part of the case body,
The battery pack according to claim 12 or 13, wherein the cover is provided with a second drainage port for discharging water inside the housing case to the outside of the housing case. An electric device having a battery pack containing battery cells in a storage case, and an electric device main body to which the battery pack can be attached and detached,
The said battery pack has the structure described in any one of Claims 1-16, The electric equipment characterized by the above-mentioned.

Images