JP4568086B2 - Pack battery - Google Patents

Description

  The present invention relates to a battery pack that can be attached to and detached from an electric device, and more particularly to a battery pack that is optimal for a power tool.

A battery pack attached to an electric device can be conveniently used by being charged in a short time. This is because the electric device cannot be used during charging, and can be used after being charged and attached to the electric device. If the charging current of the battery pack is increased in order to shorten the charging time, the heat generation of the battery pack increases and the temperature increases. When the battery temperature becomes high during charging, the electrical characteristics of the battery are lowered and the lifetime is shortened. In order to eliminate this drawback, a pack battery that can cool the battery by blowing air into the case has been developed (see Patent Documents 1 and 2).
JP 2003-142051 A JP 2004-152769 A

  The battery pack described in the above publication has an air inlet and an outlet on the upper surface of the case. Air flows into the case from the inflow port to cool the battery, and the air whose temperature is increased by cooling the battery is exhausted from the exhaust port to the outside of the case. Since the battery pack described in these publications has both an air inlet and an outlet on one surface of the upper surface of the case, a structure for uniformly cooling all the built-in batteries with air Has the disadvantage of becoming complicated. In particular, it is extremely difficult to control the air flow so as to uniformly cool all the batteries stored in the case, and there is a drawback that the temperature of the batteries varies.

  This drawback can be eliminated by housing the battery in the case in a posture in which, for example, an air inlet is opened at one end of the case and an air outlet is opened at the other end and the inlet faces the outlet. In this battery pack, air flowing into the case from the inflow port flows between the batteries to cool the battery, and then exhausts to the outside from the discharge port at the other end to cool the battery uniformly and efficiently. . However, the battery pack with this structure has a complicated structure for closing the openings at both ends in a state where the battery pack is mounted on an electric device. This is because the electric device needs to close the openings at both ends of the battery pack. If the battery pack is attached to an electric device without closing the opening, there is a drawback that when the electric device is used, dust and foreign matter enter from the opening and the cooling effect of the battery decreases. In particular, this problem is particularly serious in electric devices used in places where dust is likely to be generated, such as electric tools. For this reason, when charging the battery pack, the inlet and outlet are opened to cool the battery. However, when the battery pack is mounted on an electrical device, the inlet and outlet are closed to prevent dust from entering. There is a need. In particular, the battery has a higher temperature when charging than a temperature when discharging. For this reason, even if it is necessary to cool with air when charging, it is not always necessary to cool when discharging. Accordingly, when the battery pack is charged, both the inlet and the outlet are opened, but it is important to close both the inlet and the outlet when the battery pack is attached to an electric device.

  Moreover, the pack battery which detects the voltage of each battery and controls charging / discharging with the battery voltage incorporates a circuit board on which an electronic circuit for realizing this is mounted. In the battery pack having both ends opened, when the circuit board is arranged at both ends, a through hole through which air in the opening is passed is provided, so that a substantial area is reduced. If the circuit board is arranged on the bottom surface or the top surface in order to eliminate this drawback, the wiring of the lead wires for detecting each battery voltage becomes complicated. This is because the circuit board is arranged in parallel with the battery. The circuit board in a posture parallel to the battery has a drawback that the lead wire connected to the electrode of each battery becomes long, and each lead wire cannot be separated and wired, so that it is easily short-circuited inside.

  The present invention has been developed for the purpose of solving all of these drawbacks. An important object of the present invention is that the battery can be uniformly and efficiently cooled while having a simple structure inside, and in the state where it is mounted on an electrical device, both surfaces are closed and both the inlet and outlet are closed. An object of the present invention is to provide a battery pack that can prevent entry of dust and the like, and that can simplify wiring between the battery and the circuit board while enlarging the circuit board built in the case.

The battery pack of the present invention has the following configuration in order to achieve the aforementioned object.
The battery pack according to the present invention is a battery pack that is detachable from the electric device 30, and stores the battery 2 that can be charged in the case 1, and is shaped so that the case 1 can be detachably attached to the electric device 30. The case 1 includes a first end face wall 11 and a second end face wall 12 located at both ends in the longitudinal direction, and the first end face wall 11 between the first end face wall 11 and the second end face wall 12. And an outer peripheral wall 13 connecting the second end face wall 12 at the outer peripheral portion. Further, the case 1 is connected to an end opening 14 that opens to the first end face wall 11 and extends in the vertical direction from the first end face wall 11 toward the second end face wall 12 inside. And an L-shaped air duct 4 which is connected to the vertical duct 4 </ b> A and has a lateral duct 4 </ b> B whose end is connected to a lateral opening 15 which opens to the outer peripheral wall 13 of the case 1. ing. The battery pack is provided with a battery housing part 5 between the vertical duct 4A and the outer peripheral wall 13, and a plurality of batteries 2 are housed in the battery housing part 5 in a posture parallel to the vertical duct 4A so as to surround the vertical duct 4A. The battery 2 housed in the battery housing 5 is cooled with air blown into the air duct 4.

  In the battery pack of the present invention, the circuit board 3 is disposed inside the case 1 and inside the second end wall 12, and is located inside the circuit board 3, and is formed between the vertical duct 4 </ b> A and the outer peripheral wall 13. A plurality of batteries 2 can be stored by providing a battery storage unit 5 therebetween.

  In the battery pack 10 of the present invention, the first end face wall 11 and the main body fitting surface 13A of the outer peripheral wall 13 opening the lateral opening 15 are opposed to the mounting surface 31 provided in the electric device 30. Can be installed. In the state where the battery pack 10 is mounted on the electric device 30, the end opening 14 of the first end surface wall 11 and the lateral opening 15 of the main body fitting surface 13 </ b> A are blocked by the mounting surface 31 of the electric device 30. To do.

  In the battery pack 10 of the present invention, the lateral opening 15 can be formed in a slit shape extending in the longitudinal direction of the case 1. Further, the battery pack 10 of the present invention uses the battery 2 as the lithium ion secondary battery 2 and includes a voltage detection circuit for detecting each battery voltage on the circuit board 3, and the positive and negative electrodes of each battery 2 are connected to the circuit board 3. It is possible to control charging / discharging while detecting each battery voltage with a voltage detection circuit. Furthermore, the battery pack 10 according to the present invention includes an inner case 6 disposed in the case 1, a vertical duct 4 </ b> A provided inside the inner case 6, and a battery between the outer side of the inner case 6 and the outer peripheral wall 13. 2 can be stored.

  The battery pack of the present invention can cool the battery uniformly and efficiently with a simple structure in which an L-shaped air duct is provided inside. The battery pack according to the present invention has an L-shaped air duct and has a structure in which one of the first end face wall and the outer peripheral wall is opened to circulate the air, so that the battery pack is mounted on an electric device. In such a state, it is possible to close the two surfaces with the mounting surface of the electric device and close the opening of the L-shaped air duct. For this reason, the opening part of the L-shaped air duct provided inside can be blocked while the mounting part of the electric device has a simple structure, and dust and dust can be prevented from entering here.

  Furthermore, the battery pack of the present invention is provided with an L-shaped air duct inside the case, and the battery is stored between the L-shaped air duct and the outer peripheral wall. Is efficiently cooled from both the L-shaped air duct and the outer peripheral wall. In addition, the L-shaped air duct allows air to pass smoothly and efficiently cools the battery in the case from the inside.

  In the battery pack according to claim 2 of the present invention, the circuit board built in the case can be enlarged while the battery can be efficiently cooled. This is because the circuit board is provided inside the second end face wall where no opening is provided. Further, this battery pack has a feature that wiring between the circuit board and the electrode of each battery can be simplified if the battery electrode is connected to the circuit board. This is because the circuit board is disposed on the inner surface of the second end wall and the battery is accommodated in a posture parallel to the vertical duct. The battery stored in the case in this position can be connected to the circuit board by arranging the lead wire in parallel with the battery, and the battery electrode can be connected to the circuit by arranging the lead wire at the boundary of the battery. Can be connected to the board.

  Embodiments of the present invention will be described below with reference to the drawings. However, the example shown below illustrates the battery pack for embodying the technical idea of the present invention, and the present invention does not specify the battery pack as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  1 and 2 show a battery pack 10 according to an embodiment of the present invention and an electric device 30 to which the battery pack 10 is attached. FIG. 3 shows the electric device 30 with the battery pack 10 removed. In the battery pack 10 shown in these drawings, the electric device 30 to be mounted is an electric tool such as a hammer drill or a drill. However, the battery pack of the present invention can be used as a power source for electric tools other than hammer drills and drills, and can also be used as a power source for electric devices other than electric tools.

  The battery pack 10 is connected to an L-shaped mounting surface 31 provided in the electric device 30. The electric device 30 shown in the figure has a horizontal mounting surface 31A connected to the lower end of a grip 33 connected to a main body 32, and a vertical mounting surface 31B connected to one end of the horizontal mounting surface 31A at a right angle. The battery pack 10 is connected to the horizontal mounting surface 31A and the vertical mounting surface 31B. In the illustrated electrical apparatus 30, a connection terminal 34 for connecting the output terminal 9 of the battery pack 10 is provided on the horizontal mounting surface 31 </ b> A. Further, the horizontal mounting surface 31 </ b> A is provided with a connection groove 35 for connecting the battery pack 10. The connecting grooves 35 are provided extending in the longitudinal direction on both sides of the horizontal mounting surface 31A. The vertical mounting surface 31B is planar and closes the end opening 14 provided in the first end surface wall 11 of the battery pack 10 mounted here. The lateral duct 4B provided on the main body fitting surface 13A of the outer peripheral wall 13 of the battery pack 10 is closed by the horizontal mounting surface 31A.

  A battery pack 10 shown in FIG. 4 to FIG. 7 houses a battery 2 that can be charged in a case 1, and has a shape that allows the case 1 to be attached to and detached from an electrical device 30. The illustrated battery pack 10 includes a case 1, a battery 2 housed in the case 1, and a circuit board 3 housed in the case 1.

  The case 1 is made of plastic, and is located between the first end face wall 11 and the second end face wall 12 located at both ends in the longitudinal direction, and between the first end face wall 11 and the second end face wall 12 and has a first end. The surface wall 11 and the second end surface wall 12 are molded into a shape having an outer peripheral wall 13 connecting the outer peripheral portions. As shown in the sectional view of FIG. 5, the case 1 is provided with an L-shaped air duct 4 inside. The air duct 4 is formed in an L shape by connecting a horizontal duct 4B to a vertical duct 4A. The vertical duct 4 </ b> A has one end connected to the end opening 14 that opens to the first end face wall 11 and closes the other end inside the case 1. The vertical duct 4 </ b> A is located substantially in the center of the case 1 and extends in the vertical direction from the end opening 14 of the first end face wall 11 toward the second end face wall 12. A battery storage 5 is provided around the vertical duct 4A. The battery pack 10 shown in FIG. 5 and FIG. 6 stores two batteries 2 connected in series in 10 rows in a battery storage 5 around the vertical duct 4A.

  The horizontal duct 4 </ b> B has one end connected to the middle of the vertical duct 4 </ b> A and the other end connected to a horizontal opening 15 that opens to the body fitting surface 13 </ b> A of the outer peripheral wall 13. The main body fitting surface 13 </ b> A is one surface of the outer peripheral wall 13 or a part of the outer peripheral wall, and is a surface that is mounted on the mounting surface 31 of the electrical device 30. In the illustrated battery pack 10, the horizontal duct 4 </ b> B is connected to the middle of the vertical duct 4 </ b> A, but the horizontal duct can be connected further to the back of the vertical duct. The lateral opening 15 that is the opening of the lateral duct 4 </ b> B is blocked by the horizontal mounting surface 31 </ b> A while being mounted on the electrical device 30. In the illustrated battery pack 10, the upper surface of the case 1 is a main body fitting surface 13 </ b> A, and the main body fitting surface 13 </ b> A is mounted on the horizontal mounting surface 31 </ b> A of the electrical device 30. Provided. In the present specification, the vertical direction of the battery pack means the vertical direction when the battery pack 10 is mounted on the electric device 30, that is, the vertical direction in FIGS. 1, 2, and 4 to 6. And

  The vertical duct 4A has a battery 2 disposed above, on both sides, and below. Therefore, the vertical duct 4A has a width that allows the battery 2 to be disposed above and below, and a height that allows the battery 2 to be disposed on both sides. Since the vertical duct 4A connects the horizontal duct 4B upward, the battery 2 disposed on the vertical duct 4A is disposed on both sides of the horizontal duct 4B. The battery pack 10 shown in the figure has four rows of batteries 2 arranged above the vertical duct 4A, two rows on both sides, and two rows below, and the batteries 2 are arranged in ten rows as a whole. The battery pack 10 shown in the figure contains 10 rows of batteries 2 as a whole, but the battery pack of the present invention can contain 9 rows or less of batteries in the case, or 11 rows of batteries or more. it can.

  The vertical duct 4A cools the battery 2 housed in the case 1 from the inside. Therefore, the battery 2 housed in the case 1 is in contact with the vertical duct 4A on the inside. Moreover, since the outside of the battery 2 is cooled by the case 1, the battery 2 is in contact with the inner surface of the outer peripheral wall 13 of the case 1. In the case 1 in the figure, an inner case 6 in which plastic is molded into a cylindrical shape is disposed in the case 1 in order to increase the contact area between the vertical duct 4A and the battery 2.

  A perspective view of the inner case 6 is shown in FIG. The inner case 6 in this figure is formed into a cylindrical shape whose inner surface is in contact with the outer surface of the vertical duct 4A, and on the outer side, spacer ridges 7 that protrude between the valleys of the battery 2 are integrally formed. ing. In the illustrated inner case 6, the spacer protrusions 7 are provided between the batteries 2 in two rows without protruding the spacer protrusions in the valleys of all the batteries 2. That is, the spacer ridges 7 are provided above the vertical duct 4 </ b> A and between the side batteries 2 and between the side and bottom batteries 2. The spacer ridges 7 are formed in a shape along the surface of the cylindrical battery 2 to increase the contact area with the battery 2. Although not shown, the inner case can be provided with spacer protrusions so as to protrude between the valleys of all the batteries, so that the contact area between the battery and the vertical duct can be increased. The inner case 6 opens a portion for guiding the horizontal duct 4B in order to open the horizontal duct 4B.

  The case 1 shown in the figure is composed of a main body case 1A and a lid case 1B, and a vertical duct 4A is integrally formed with the main body case 1A. The main body case 1 </ b> A integrally forms the first end face wall 11, the outer peripheral wall 13, and the vertical duct 4 </ b> A, and opens an end face that is closed by the second end face wall 12. The lid case 1B integrally forms the second end wall 12 and is connected to the opening of the main body case 1A to close it. The case 1 with this structure is a circuit in which the inner case 6 is inserted into the main body case 1A with the lid case 1B removed and set in a fixed position, and the battery 2 and the battery 2 are connected together with the inner case 6. The board 3 is housed in the main body case 1A, and then the lid case 1B closes the opening of the main body case 1A for assembly.

  In the case 1, a connecting protrusion 8 that is connected to the connecting groove 35 of the horizontal mounting surface 31 </ b> A of the electric device 30 is integrally formed on the main body fitting surface 13 </ b> A of the outer peripheral wall 13. The connecting projection 8 in the figure is provided with a locking portion 8A that is bent outward along the upper end. The connecting ridge 8 is connected to the horizontal mounting surface 31 </ b> A of the electric device 30 by locking the locking portion 8 </ b> A to the connecting groove 35. The battery pack 10 is mounted at a fixed position of the electric device 30 and is connected by a stopper (not shown) so as not to come off at this position. The battery pack 10 is removed from the electric device 30 by releasing the stopper. Further, the case 1 shown in the figure has an output terminal 9 on the main body fitting surface 13A. The output terminal 9 is connected to a connection terminal 34 provided on the horizontal mounting surface 31 </ b> A of the electric device 30 in a state where the battery pack 10 is mounted at a fixed position of the electric device 30.

  In the illustrated battery pack 10, two batteries 2 are connected in series in a straight line and stored in a battery storage unit 5. All the batteries 2 have their electrodes connected to the circuit board 3 via lead wires 16. FIG. 9 is a schematic diagram for connecting the battery 2 to the circuit board 3. However, in this figure, for easy understanding, the battery 2 arranged around the vertical duct 4A is illustrated as being developed. In the battery pack 10 having the circuit configuration shown in this figure, two batteries 2 are connected in parallel, and 10 sets of batteries 2 connected in parallel are connected in series. As shown in FIG. 5, the circuit board 3 is arranged on the inner surface of the second end face wall 12 of the case 1, and the battery 2 is arranged in a posture orthogonal to the circuit board 3.

  The 20 batteries 2 are connected by the intermediate connection fitting 17 and the end connection fitting 18. The intermediate connection fitting 17 and the end connection fitting 18 are connected to the electrodes of the four batteries 2, and two batteries 2 connected in parallel are connected in series. In FIG. 9, the intermediate connection fitting 17 connects the adjacent batteries 2 in parallel and connects the upper and lower batteries 2 in series. The end connection fitting 18 is connected to the electrodes of the batteries 2 arranged in four horizontal rows, and the batteries 2 connected in parallel are connected in series while the batteries 2 in the two horizontal rows are connected in parallel.

  The battery 2 is a lithium ion secondary battery. The circuit board 3 is mounted with a voltage detection circuit that detects all battery voltages. The voltage detection circuit detects all battery voltages and controls the charge / discharge current. For example, this voltage detection circuit cuts off the charging current when any battery voltage rises to the maximum voltage, and cuts off the discharging current when any battery voltage drops to the lowest voltage.

  In order to detect all battery voltages, all the intermediate connection fittings 17 and the end connection fittings 18 are connected to the circuit board 3 via the lead wires 16. The lead wire 16 is disposed in the valley of the battery 2 to connect the intermediate connection fitting 17 and the end connection fitting 18 to the circuit board 3. The lead wires 16 disposed in the valleys of the battery 2 do not contact each other and short-circuit, and do not contact and short-circuit the intermediate connection fitting 17 and the end connection fitting 18 that are not connected.

  The circuit board 3 is disposed at a fixed position on the inner surface of the second end wall 12 via the holder case 19. As shown in FIG. 5, the holder case 19 is disposed between the battery 2 and the circuit board 3. Further, the holder case 19 shown in FIG. 5 is integrally formed with positioning ribs 19A for positioning the circuit board 3 at a fixed position.

The battery pack having the above structure is assembled as follows.
(1) Four batteries 2 are connected by an intermediate connecting bracket 17 to form a battery block 20. The four batteries 2 are arranged in parallel in the same direction, and the two batteries 2 arranged in parallel are connected in series in a straight line by the intermediate connection fitting 17. That is, the four batteries 2 connect the two batteries 2 connected in parallel to form a battery block 20. The intermediate connection fitting 17 is connected to the electrode of the battery 2 by resistance welding, for example. Twenty batteries 2 are connected to each other by means of the intermediate connecting bracket 17 to form five battery blocks 20.

(2) Five battery blocks 20 are arranged around the inner case 6. As shown in FIG. 6, the five battery blocks 20 are arranged along the outer periphery of the inner case 6, with two sets on the upper side, two sets on both sides, and one set on the lower side. At this time, it arrange | positions so that the spacer protrusion 7 may be located in the trough between the adjacent battery blocks 20. FIG. The five sets of battery blocks 20 arranged around the inner case 6 are fixed to the inner case 6 with an adhesive tape wound around or bonded to the outer periphery.

(3) The battery blocks 20 adjacent to each other among the five sets of battery blocks 20 arranged around the inner case 6 are connected by the end connection fitting 18. The end fitting 18 is connected to the electrodes of the four adjacent batteries 2 and connects the battery blocks 20 adjacent to each other in series. The end fitting 18 is also connected to the electrode of the battery 2 by resistance welding, for example.

(4) The holder case 19 is disposed on the end surface of the inner case 6 to which the battery block 20 is fixed on the second end surface wall 12 side, and the circuit board 3 is disposed on the holder case 19.
(5) The intermediate connection fitting 17 and the end connection fitting 18 that connect the battery 2 are connected to the circuit board 3 via the lead wires 16. Lead wires 16 connected to the circuit board 3 are arranged in the valleys of the battery 2.

(6) Insert the inner case 6 having the battery 2 around it and the circuit board 3 on the end face into the main body case 1A. At this time, the inner case 6 is inserted in a state in which the outer surface of the vertical duct 4A is fitted inside, and is set at a fixed position. In this state, the 20 batteries 2 arranged around the inner case 6 are arranged at fixed positions of the battery housing portion 5 formed between the vertical duct 4A and the outer peripheral wall 13.
(7) The lid case 1B is connected to the opening of the main body case 1A and closed.

  As shown in FIGS. 1 and 2, the battery pack 10 assembled as described above is mounted on the mounting surface 31 of the electrical device 30 and used as a power source for the electrical device 30. The battery pack 10 attached to the electric device 30 supplies the electric device 30 with electric power by discharging the built-in battery 2. The battery pack 10 from which the internal battery 2 is discharged is charged by a charger.

  FIG. 10 shows a schematic diagram of charging the battery pack 10 with the charger 40. The charger 40 shown in the figure includes a mounting surface 41 on which the battery pack 10 is mounted. Although not shown, the charger is provided with a power supply terminal for connecting the output terminal of the battery pack and a connecting groove for connecting the connecting protrusions of the battery pack on the mounting surface. The charger 40 mounts the battery pack 10 in a posture in which the main body fitting surface 13 </ b> A opening the lateral opening 15 faces the mounting surface 41. However, the charger may have a mounting surface as a vertical surface or an inclined surface.

  Further, the charger 40 is provided with an air passage 42 for blowing air to the air duct 4 of the battery pack 10. The charger 40 shown in the figure forms a ventilation path 42 by providing a through-hole penetrating from the mounting surface 41 to the bottom surface. The air passage 42 opens the air opening 43 at a position facing the lateral opening 15 of the battery pack 10 attached to the attachment surface 41. Further, the charger 40 shown in the figure has a fan 44 disposed in the air passage 42 in order to forcibly blow air to the air duct 4 of the battery pack 10. The charger 40 having this structure operates the fan 44 to forcibly blow air to the air duct 4 in a state where the battery pack 10 is mounted and charged, and cools the battery 2 with the forced air. The fan 44 shown in the figure blows air from the air duct 4 toward the air blowing path 42, but the fan can also blow air from the air blowing path toward the air duct. Furthermore, the charger does not necessarily have a fan, and the battery can be cooled by allowing air to pass through the air duct by natural convection.

It is a disassembled perspective view which shows the state which attaches the battery pack concerning one Example of this invention to an electric equipment. 1 is a rear perspective view showing a state where a battery pack according to an embodiment of the present invention is mounted on an electrical device. It is a back perspective view which shows the electric equipment which removed the battery pack. 1 is a perspective view of a battery pack according to an embodiment of the present invention. FIG. 5 is a vertical sectional view of the battery pack shown in FIG. 4. FIG. 6 is a cross-sectional view taken along line AA of the battery pack shown in FIG. 5. It is a perspective view of the main body case of the battery pack shown in FIG. It is a perspective view of an inner case. It is a general | schematic expanded view which shows the state which connects a battery to a circuit board. It is a schematic sectional drawing which shows an example which charges the battery pack concerning one Example of this invention with a charger.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Case 1A ... Main body case 1B ... Lid case 2 ... Battery 3 ... Circuit board 4 ... Air duct 4A ... Vertical duct 4B ... Horizontal duct 5 ... Battery storage part 6 ... Inner case 7 ... Spacer protrusion 8 ... Connection protrusion 8A DESCRIPTION OF SYMBOLS ... Locking part 9 ... Output terminal 10 ... Pack battery 11 ... 1st end surface wall 12 ... 2nd end surface wall 13 ... Outer peripheral wall 13A ... Main body fitting surface 14 ... End opening 15 ... Side opening 16 ... Lead wire DESCRIPTION OF SYMBOLS 17 ... Middle connection metal fitting 18 ... End connection metal fitting 19 ... Holder case 19A ... Positioning rib 20 ... Battery block 30 ... Electric equipment 31 ... Mounting surface 31A ... Horizontal mounting surface 31B ... Vertical mounting surface 32 ... Main body 33 ... Grip 34 ... Connection Terminal 35 ... Connecting groove 40 ... Charger 41 ... Mounting surface 42 ... Blower passage 43 ... Blower opening 44 ... Fan

Claims (6)

A battery pack (2) that stores a rechargeable battery (2) in a case (1), and that has a shape that allows the case (1) to be detachably attached to an electrical device (30),
The case (1) includes a first end face wall (11) and a second end face wall (12) located at both ends in the longitudinal direction, a first end face wall (11), and a second end face wall (12). And an outer peripheral wall (13) connecting the first end wall (11) and the second end wall (12) at the outer periphery,
Further, the case (1) is connected to an end opening (14) that opens to the first end face wall (11), and the first end face wall (11) to the second end face wall (12) are provided therein. The vertical duct (4A) that extends in the vertical direction toward the vertical direction and the horizontal opening (15) that is connected to the vertical duct (4A) and opens at the outer peripheral wall (13) of the case (1) An L-shaped air duct (4) consisting of a horizontal duct (4B)
A battery compartment (5) is provided between the vertical duct (4A) and the outer peripheral wall (13), and a plurality of batteries (2) are placed in the battery compartment (5) in a posture parallel to the vertical duct (4A). Electrical equipment that is housed in a state surrounding the vertical duct (4A) and that cools the battery (2) housed in the battery compartment (5) with air blown into the air duct (4) Pack battery to be removed.   A circuit board (3) is arranged inside the second end face wall (12), inside the circuit board (3) and between the vertical duct (4A) and the outer peripheral wall (13). The battery pack according to claim 1, further comprising a battery housing (5).   The mounting surface (31) provided on the electrical device (30) with the first end face wall (11) and the body fitting surface (13A) of the outer peripheral wall (13) opening the lateral opening (15). The battery pack is mounted to face the end opening 14 of the first end wall 11 and the body fitting surface 13A in a state where the battery pack is mounted on the electric device 30. The battery pack according to claim 1, wherein the lateral opening (15) of the electric device (30) is closed by the mounting surface (31) of the electric device (30).   The battery pack according to claim 1, wherein the lateral opening (15) has a slit shape extending in the longitudinal direction of the case (1).   The battery (2) is a lithium ion secondary battery, and the circuit board (3) has a voltage detection circuit for detecting each battery voltage, and each battery (2) has positive and negative electrodes connected to the circuit board (3). The battery pack according to claim 1, wherein the voltage detection circuit controls charging and discharging while detecting each battery voltage. An inner case (6) is arranged in the case (1), a vertical duct (4A) is provided inside the inner case (6), and the outside of the inner case (6) and the outer peripheral wall (13) The battery pack according to claim 1, wherein a battery (2) is accommodated therebetween.

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