JP2013218927A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a secondary battery to be built while miniaturizing an exterior appearance.SOLUTION: A battery pack is connected to a battery driving apparatus BD, and can feed power to an apparatus-side secondary battery built in the battery driving apparatus BD. The battery pack comprises a square secondary battery cell 1 having constant thickness on an end face, a circuit board 30 connected to the secondary battery cell 1, and a body case 10 housing the secondary battery cell 1 and the circuit board 30. The circuit board 30 and the secondary cell 1 can be laminated. Thereby, the circuit board 30 and the secondary battery cell 1 can be efficiently arranged in a limited space of the body case 10.

Description

  The present invention relates to a portable battery pack that includes a built-in battery that can be charged and further includes a connector that supplies power to a battery-driven device connected to the outside.

  A battery pack having a pair of cylindrical batteries built therein has been developed (see Patent Document 1). The battery pack 900 shown in Patent Document 1 is a pack type used as a portable power source, and an exploded perspective view thereof is shown in FIG. In this battery pack 900, an insulating holder 903 is disposed between a pair of cylindrical batteries 901, and the cylindrical battery 901 and the substrate circuit 904 are disposed in a fixed position with the insulating holder 903, thereby forming a battery assembly 909. This battery assembly 909 is housed in an outer case 902. Also, as shown in FIG. 12, a USB port 905 for supplying power to the battery-driven device is provided on one side, and the USB port 905 is connected to the battery-driven device BD using the USB cable 906 to charge it.

  Since this battery pack uses a cylindrical battery, the size of the main body case for storing the battery is increased and the weight is increased. Considering the convenience of carrying, a smaller and lighter battery pack is desired. In addition, in order to charge the battery-driven device, it is necessary to separately prepare a USB cable for connecting the USB port and the battery-driven device, which further reduces portability. If you forget to carry the USB cable with the battery pack when you go out, there is also a problem that charging is not possible.

  On the other hand, when the main body case of the battery pack is downsized, there is a problem that it is difficult to protect the battery housed therein. That is, when it is necessary to protect the battery from an external force or the like, if the main body case is reduced in size, the space between the battery and the main body case is narrowed, and an impact applied to the main body case is easily transmitted to the battery. Especially with portable battery packs, it may be difficult to handle such as dropping or colliding with other objects when carrying, so it is necessary to improve impact resistance. There is also a problem that it is difficult to maintain such characteristics.

JP 2009-131089 A

  The present invention has been made to solve such conventional problems. A main object of the present invention is to provide a battery pack capable of protecting a built-in secondary battery while miniaturizing the appearance.

Means for Solving the Problems and Effects of the Invention

  In order to achieve the above object, according to the battery pack of the first aspect of the present invention, the battery pack can be connected to a battery-driven device and can supply power to a device-side secondary battery built in the battery-driven device. A square secondary battery cell having a constant thickness at an end surface, a circuit board connected to the secondary battery cell, and a main body case for housing the secondary battery cell and the circuit board. The circuit board and the secondary battery cell can be stacked and arranged. With the above configuration, the circuit board and the secondary battery cell are stacked, so that the occupied area is small compared with the configuration in which the secondary battery cell and the circuit board are arranged in the lateral direction, and the space of the limited main body case These members can be efficiently arranged inside.

  The battery pack according to the second aspect further includes a battery holder that houses the secondary battery cell, the main body case is formed in a dome shape with a chamfered appearance, and the battery holder includes: The secondary battery cell is provided with a holder wall that covers an end face of the secondary battery cell, the end face of the holder wall being in contact with the inner surface of the main body case, and the secondary battery A battery protection wall that is higher than the thickness of the end face of the cell can be formed at least in part.

  With the above configuration, by covering the periphery of the secondary battery cell with a battery protection wall thicker than the thickness of the secondary battery cell, the secondary battery cell can be lifted from the main body case, and external force is applied to the main body case. Even if added, it is possible to protect the secondary battery cell by avoiding a situation in which the impact directly acts on the secondary battery cell.

  Furthermore, according to the battery pack which concerns on a 3rd side surface, the said holder wall can be made at least partially higher than the thickness of the end surface of this secondary battery cell in the state which accommodated the said secondary battery cell.

  With the above structure, the secondary battery cell is covered with a holder wall thicker than the thickness of the secondary battery cell, and the holder wall is brought into contact with the main body case to lift the secondary battery cell from the main body case. As a result, even when an external force is applied to the main body case, the secondary battery cell can be protected by avoiding a situation in which an impact directly acts on the secondary battery cell.

  Further, according to the battery pack of the fourth aspect, the inner surface of the main body case is provided with a case rib that supports the holder wall at a position corresponding to the holder wall, and the battery holder is stored in the main body case. In this state, the holder wall and the case rib can be integrally joined to form the battery protection wall.

  With the above configuration, the battery protection wall is configured by the holder wall of the battery holder and the case rib of the main body case, and the secondary battery cell can be protected in a state of being floated from the main body case.

  Furthermore, according to the battery pack of the fifth aspect, the circuit board is disposed on a substrate placement surface of the battery holder opposite to a cell placement surface for holding the secondary battery cell, and the main body The case is provided with a support rib for supporting the board placement surface of the battery holder, and the thickness of the support rib can be made larger than the thickness of the circuit board.

  With the above configuration, in addition to the secondary battery cell, the circuit board can be protected from an external impact by being lifted from the main body case by the support rib.

  Furthermore, according to the battery pack of the sixth aspect, the circuit board can arrange electronic components on the opposite side of the battery holder from the cell arrangement surface that holds the secondary battery cell.

  With the above configuration, electronic components can be eliminated from the cell arrangement surface side, and the entire thickness can be reduced accordingly.

  Furthermore, according to the battery pack according to the seventh aspect, the circuit board is stacked in a position not partially overlapping with the secondary battery cell, and the secondary battery of the battery holder is disposed in the non-overlapping region. On the same side as the cell arrangement surface that holds the cell, a push switch that is partially exposed to the outside can be provided.

  With the above configuration, the press switch can be arranged using the space around the secondary battery cell, and the members can be arranged efficiently without increasing the outer shape.

  Furthermore, according to the battery pack of the eighth aspect, the battery pack further includes a connector portion that is detachable from the main body case, and a cable portion that connects the connector portion and the main body case, and the connector portion includes The main body case can be provided with a terminal insertion hole for inserting the output terminal in a state where the connector portion is mounted.

  With the above configuration, when the connector portion is not used, the output terminal can be inserted into the terminal insertion hole, and can also be used as a physical connection structure for connecting the connector portion to the main body case.

  Furthermore, according to the battery pack of the ninth aspect, the main body case is provided with a cutout portion in which a portion to which the connector portion is connected is cut out, and the connector portion is a cutout portion of the main body case. It can be formed so as to form an integral appearance with the main body case in a state of being attached to the main body case.

  With the configuration described above, the shape of the connector portion can be integrated with the main body case, and an appearance that is excellent in design can be obtained.

  Furthermore, according to the battery pack of the tenth aspect, the main body case includes a power supply connector for supplying power to the secondary battery cell, and the power supply is mounted in a state where the connector portion is attached to the main body case. The connector can be closed.

  With the above configuration, the connector part can also be used as a cover for the power supply connector, and when not in use, the power supply connector can be closed to prevent foreign substances such as dust from entering, and the power supply connector can be prevented from being exposed, and the appearance can be cleaned Can improve.

It is a perspective view which shows the battery pack which concerns on Embodiment 1 of this invention. It is a perspective view which shows the state which supplies electric power to a battery drive apparatus with the battery pack of FIG. It is a perspective view which shows the state which removed the connector part from the battery pack of FIG. It is a perspective view which shows the state which charges the battery pack of FIG. It is a disassembled perspective view of the battery pack of FIG. FIG. 6 is a further exploded perspective view of the battery pack of FIG. 5. It is the disassembled perspective view which looked at the battery pack of FIG. 6 from diagonally downward. It is sectional drawing in the VIII-VIII line of the battery pack of FIG. It is sectional drawing in the IX-IX line of the battery pack of FIG. It is sectional drawing in the XX line of the battery pack of FIG. It is a disassembled perspective view of the conventional battery pack. It is a perspective view which shows a mode that a battery drive apparatus is charged with the battery pack of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a 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 the present 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 appended to the members shown. However, the members shown in the claims are not limited to the members in the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It is just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.
Example 1

  A battery pack 100 according to an embodiment of the present invention is shown in FIGS. In these drawings, FIG. 1 is a perspective view showing a battery pack according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing a state where power is supplied to a battery driving device by the battery pack of FIG. 1, and FIG. The perspective view which shows the state which removed the connector part from the battery pack of FIG. 4, FIG. 4 has each shown the perspective view which shows the state which charges the battery pack of FIG. The battery pack 100 shown in these figures is connected to the battery-driven device BD via a USB cable or the like as shown in FIG. 2 to charge the device-side secondary battery built in the battery-driven device BD. Use as a portable charger.

  The external appearance of the battery pack 100 is formed by the main body case 10. The main body case 10 is formed in a dome shape in which a corner is chamfered in a square shape in a plan view and an end portion is gradually thinned in a side view. Further, as shown in FIG. 3, a notch 13 is provided at a corner of the main body case 10, and a connector portion 40 is fitted therein to form an integral rectangular appearance. The connector part 40 is connected to the case body via the cable part 50. The connector unit 40 includes an output terminal 41. Further, the battery pack 100 includes a rechargeable secondary battery cell 1 inside, and discharges the secondary battery cell 1 through the output terminal 41 to charge the battery drive device BD. In addition, the main body case 10 is provided with a power supply connector 19 for charging the secondary battery cell 1. The power supply connector 19 is provided in the notch 13 and is exposed by removing the connector 40.

  The connector part 40 is detachable from the case body. When not in use, the connector part 40 is fitted into the notch 13 of the body case 10 as shown in FIG. 1, and is detached from the body case 10 as shown in FIG. The output terminal 41 is connected to the battery drive device BD, and the battery drive device BD is charged. On the other hand, when charging the battery pack 100, with the connector part 40 removed and the power supply connector 19 exposed as shown in FIG. Power is supplied from the power source.

5 to 7 are exploded perspective views of the battery pack 100. FIG. As shown in these drawings, the battery pack 100 includes a secondary battery cell 1, a battery holder 20 that holds the secondary battery cell 1, and a circuit board 30.
(Main body case 10)

  The main body case 10 is formed thin so that its width is larger than its thickness. Further, as shown in FIG. 5, the main body case 10 is divided into an upper case 11 and a lower case 12, and is fixed by screws or the like. The main body case 10 is made of an insulating material. For example, it is made of resin such as polycarbonate. In the main body case 10, the battery holder 20, the secondary battery cell 1, and the circuit board 30 are accommodated.

As shown in the cross-sectional views of FIGS. 8 and 9, the main body case 10 is formed in a dome shape that is curved so that the center protrudes in a side view. By setting it as such a shape, compared with the shape which made the upper surface flat, the rigidity which supports an upper surface can be improved, and the protection of the secondary battery cell 1 accommodated in an inside can be aimed at.
(Battery holder 20)

As shown in FIG. 6, the battery holder 20 has a rectangular frame shape, and stores the secondary battery cell 1 from the upper surface thereof.
(Holder wall 22)

The frame-type battery holder 20 includes a holder wall 22 that covers an end surface of the secondary battery cell 1 in a state where the secondary battery cell 1 is accommodated. It is preferable that the holder wall 22 be at least partially higher than the thickness of the end face of the secondary battery cell 1 in a state where the secondary battery cell 1 is accommodated. The end face of the holder wall 22 is brought into contact with the inner surface of the upper case 11 of the dome-shaped main body case 10 as shown in the cross-sectional views of FIGS.
(Case rib 14)

  Further, on the inner surface of the upper case 11, a case rib 14 for supporting it is provided at a position corresponding to the holder wall 22 of the battery holder 20. The case rib 14 is integrally joined to the holder wall 22 in a state where the battery holder 20 is housed in the main body case 10 to form a battery protection wall.

  In this way, the battery wall is formed by the holder wall 22 of the battery holder 20 and the case rib 14 of the main body case 10, and the secondary battery cell 1 is lifted from the main body case 10. Even if is added, it is possible to protect the secondary battery cell 1 by avoiding a situation in which an impact directly acts on the secondary battery cell 1.

Further, since the main body case 10 is formed in a dome shape as described above, the buffer space 16 is provided between the upper surface of the secondary battery cell 1 and the inner surface of the dome-shaped main body case 10. Even if stress is applied from this point, this portion acts as a buffer layer, and the secondary battery cell 1 can be protected by reducing the impact force. In addition, even if the secondary battery cell 1 expands, deformation of the main body case 10 can be avoided by expanding into the buffer space 16 from the battery holder 20 whose upper surface is opened.
(Secondary battery cell 1)

The secondary battery cell 1 is configured in a rectangular shape that can be stored in the battery holder 20. The secondary battery cell 1 also has a thin outer shape with a width larger than its thickness. Here, as shown in FIG. 6, the planar view of the secondary battery cell 1 is rectangular. The secondary battery cell 1 may be a rechargeable secondary battery such as a lithium ion secondary battery, a lithium polymer battery, a nickel hydride battery, or a nickel cadmium battery. Among them, a lithium ion secondary battery has a large electric capacity with respect to volume and is suitable for downsizing. In addition, charging / discharging of the secondary battery cell 1 is controlled by a power supply control circuit mounted on the circuit board 30. Thereby, the battery pack 100 can supply the power required by the battery-driven device BD.
(Circuit board 30)

  A circuit board 30 is fixed to the lower surface of the battery holder 20. The circuit board 30 is electrically connected to the secondary battery cell 1 and is mounted with a power supply control circuit for controlling charge / discharge of the secondary battery cell 1. Furthermore, the connector part 40 for taking out the output of the secondary battery cell 1 controlled by the power supply control circuit is connected to the outside via a cable part 50.

  The circuit board 30 is arranged on the board arrangement surface 25 opposite to the cell arrangement surface 24 that holds the secondary battery cell 1 of the battery holder 20. On the other hand, the lower case 12 of the main body case 10 is provided with support ribs 15 for supporting the substrate placement surface of the battery holder 20. Here, the thickness of the support rib 15 is made larger than the thickness of the circuit board 30. As a result, not only the secondary battery cell 1 but also the circuit board 30 can be protected from an external impact as being lifted from the main body case 10 by the support ribs 15.

  In addition, the circuit board 30 has electronic components arranged on the board arrangement surface 25 opposite to the inner cell arrangement surface 24 of the battery holder 20. Thus, electronic components can be eliminated from the cell arrangement surface 24 side, and the entire thickness can be reduced accordingly. In particular, as shown in the cross-sectional views of FIGS. 8 and 9, the circuit board 30 is arranged along the bottom surface of the secondary battery cell 1, thereby providing a space between the upper surface of the circuit board 30 and the inner surface of the lower case 12. Since the (board space 17) is provided, the electronic component 31 can be mounted on the circuit board 30. In particular, the board space 17 for mounting the electronic component 31 having a certain height such as an electrolytic capacitor or a coil can be secured, and the necessary electronic component 31 can be mounted while the battery pack 100 is downsized. In addition, the board space 17 can be used as a heat dissipation space for the electronic component 31. In particular, the battery holder 20 has a bottomed box shape, and is configured with a member having insulation and heat insulation properties, thereby suppressing the heat generated in the circuit board 30 from being transferred to the secondary battery cell 1 side, Heat can be radiated into the substrate space 17 provided on the upper surface of the road substrate below.

  The size of the circuit board 30 is not limited to the size of the secondary battery cell 1. That is, the circuit board 30 can be made larger than the secondary battery cell 1. In the example shown in the horizontal cross-sectional view of FIG. 10, the circuit board 30 is made larger than the secondary battery cell 1, and the circuit board 30 is projected outside the battery holder 20. Thereby, the freedom degree of circuit design can be raised. For example, the pressing switch 32 is mounted on the circuit board 30 that protrudes downward from the battery holder 20 in FIG. 10 and is exposed from the upper case 11. With such an arrangement, the push switch 32 can be arranged in the main body case 10 without being interfered by the secondary battery cell 1. Further, the circuit board 30 is projected also on the upper side of the battery holder 20, and the end of the cable portion 50 is mounted thereon. In particular, as will be described later, the cable portion 50 is formed as a flat cable (slip shape having a constant width), so that it can be guided on the circuit board 30 without interfering with the battery holder 20 without twisting the cable portion 50. The electrical connection can be made easily without being done.

  In this way, the circuit board 30 can be stacked in a posture that does not partially overlap the secondary battery cell 1. In such a non-overlapping region, members can be arranged not only on the substrate arrangement surface 25 but also on the same side as the cell arrangement surface 24. For example, as described above, it is possible to provide the push switch 32 partially exposed to the outside. In this way, the push switch 32 and the like can be efficiently arranged using the space around the secondary battery cell 1.

Thus, each member can be efficiently arranged using the space of the main body case 10 generated around the secondary battery cell 1 while the secondary battery cell 1 is arranged in the main body case 10. In the example of FIG. 10, the secondary battery cell 1 is arranged not at the center of the main body case 10 but at an eccentric position, thereby securing a space for arranging members such as the power supply connector 19.
(Connector 40)

  The connector part 40 is connected to the main body case 10 via the cable part 50. The connector part 40 is detachably attached to a notch part 13 formed at one corner of the main body case 10. The outer shape of the connector part 40 is formed in a shape that forms a part of the main body case 10 in a state where the connector part 40 is attached to the cutout part 13, in other words, in the same shape as the other corners of the main body case 10. Here, the planar view is a right-angled triangle shape, the side view is a parabolic shape, a plane orthogonal to the joint surface with the notch 13, and the other surface is a curved surface.

  Moreover, the connector part 40 is provided with the output terminal 41 for connecting with battery drive apparatus BD. On the other hand, the body case 10 has a terminal insertion hole 18 into which the output terminal 41 is inserted with the connector portion 40 attached. By doing so, as shown in FIG. 3, when the connector part 40 is not used, the output terminal 41 can be inserted into the terminal insertion hole 18 and the connector part 40 can be locked to the main body case 10. That is, it can also be used as a physical connection structure for connecting the connector portion 40 to the main body case 10. Here, a connection body 42 formed to be slightly larger than the output terminal 41 is formed at a joint portion between the output terminal 41 and the cable portion 50, and the connection body 42 is inserted into the terminal insertion hole 18 to be connected to the cable. The part 50 is configured to be locked to the main body case 10. By doing in this way, it avoids that the surface of the output terminal 41 for electrical connection touches the terminal insertion hole 18 directly, and prevents the surface of the output terminal 41 from being damaged.

Further, the main body case 10 is provided with a power supply connector 19 at the notch 13. Here, the notch 13 has a corner portion of the main body case 10 cut out in an L shape in cross-sectional view, and the terminal insertion hole 18 is formed in one L-shaped notch surface (first notch surface 13a). The power supply connector 19 is provided on the other notch surface (second notch surface 13b). Thus, by providing the terminal insertion hole 18 and the power supply connector 19 on different surfaces, these opening portions can be efficiently arranged in the main body case 10 without increasing the outer shape of the main body case 10. Moreover, since the notch part 13 is obstruct | occluded at the time of mounting | wearing with the connector part 40, and is not exposed outside, an opening part is made invisible at the time of non-use, and an external appearance can be cleared and appearance can be improved. In addition, by closing the opening, entry of foreign matter such as dust and dirt can be prevented. In other words, the connector portion 40 can be used as a cover for the power supply connector 19.
(Cable 50)

  The cable part 50 has one end fixed to the main body case 10 and the other end fixed to the connector part 40. On the main body case 10 side, it is electrically connected to the circuit board 30, and the output power of the secondary battery cell 1 is supplied from the output terminal 41 of the connector portion 40. The cable portion 50 is formed of a flexible member, and can be bent and twisted freely to easily connect the connector portion 40 drawn from the main body case 10 to the battery-driven device BD. In the example of FIG. 3, the cable is formed in a slip shape (referred to as a flat wire, a flat cable, etc.), and when the connector portion 40 is attached to the main body case 10, it is bent along the side surface of the main body case 10. Thus, the cable portion 50 is brought into close contact with the main body case 10. That is, the length that the cable portion 50 is exposed to the outside of the main body case 10 is a length corresponding to the distance from the lead-out portion to the cutout portion 13. Thereby, the cable part 50 does not collide with the connector part 40 mounted on the main body case 10, and the appearance can be made clear. Further, a cable groove 52 into which the cable part 50 can be inserted is provided on the side surface of the main body case 10 to guide the cable part 50 to be inserted along the cable groove 52 so that the cable part 50 is in a positioning state. It can be stored and the appearance can be further simplified.

  Moreover, the situation where the output terminal 41 is erroneously inserted into the power feeding connector 19 can be avoided by minimizing the length of the cable portion 50. That is, in the example of FIG. 3, the shape of the power supply connector 19 and the shape of the output terminal 41 are the same, but the output terminal 41 is physically inserted into the power supply connector 19 by shortening the length of the cable portion 50. It is impossible to prevent erroneous insertion and improve safety.

  Further, the end edge of the cable portion 50 is connected to the circuit board 30 in the main body case 10. Here, it is preferable to arrange the cable portion 50 so as to be wound in a parallel posture without twisting as much as possible so as not to cause a load or disconnection to the internal electric wire due to excessive twisting or bending with a small radius of curvature. . For this reason, as shown in the horizontal sectional view of FIG. 10, the cable portion 50 is drawn out from the main body case 10 so as to be wound around the upper case 11 and the lower case 12 by using a boss. doing. Further, after winding, the cable rib 50 is bent into a U-shape and the cable portion 50 is sandwiched, whereby the resistance to pulling of the cable portion 50 can be enhanced.

  The battery pack according to the present invention can be suitably used as a battery pack that can be charged by connecting to a battery-driven device such as a slate PC, a smartphone, or a portable recording device.

DESCRIPTION OF SYMBOLS 100 ... Battery pack 1 ... Secondary battery cell 10 ... Main body case 11 ... Upper case 12 ... Lower case 13 ... Notch part; 13a ... First notch surface; 13b ... Second notch surface 14 ... Case rib 15 ... Supporting rib 16 ... Buffer space 17 ... Board space 18 ... Terminal insertion hole 19 ... Power feeding connector 20 ... Battery holder 22 ... Holder wall 24 ... Cell placement surface 25 ... Board placement surface 30 ... Circuit board 31 ... Electronic component 32 ... Press switch 40 ... Connector Portion 41 ... Output terminal 42 ... Connector 50 ... Cable portion 52 ... Cable groove 900 ... Battery pack 901 ... Cylindrical battery 902 ... Exterior case 903 ... Insulating holder 904 ... Board circuit 905 ... USB port 906 ... USB cable 909 ... Battery Assembly BD: Battery-powered equipment

Claims (10)

A battery pack that can be connected to a battery-driven device and can supply power to a device-side secondary battery built in the battery-driven device,
A square secondary battery cell having a constant thickness at the end face;
A circuit board connected to the secondary battery cell;
A body case for housing the secondary battery cell and the circuit board;
With
A battery pack comprising the circuit board and the secondary battery cell laminated. The battery pack according to claim 1, further comprising:
A battery holder for storing the secondary battery cell;
The main body case is formed in a dome shape with a chamfered appearance,
The battery holder includes a holder wall that covers an end surface of the secondary battery cell in a state where the secondary battery cell is accommodated.
A battery protection wall having at least part of a battery protection wall in which an end surface of the holder wall is brought into contact with an inner surface of the main body case to be higher than an end surface of the secondary battery cell. pack. The battery pack according to claim 2,
The battery pack, wherein the holder wall is at least partially higher than a thickness of an end face of the secondary battery cell in a state where the secondary battery cell is accommodated. The battery pack according to claim 2 or 3,
The inner surface of the main body case is provided with a case rib for supporting it at a position corresponding to the holder wall,
The battery pack, wherein the battery protection wall is configured by integrally joining the holder wall and a case rib in a state where the battery holder is housed in the main body case. The battery pack according to any one of claims 2 to 4,
The circuit board is disposed on a substrate placement surface opposite to a cell placement surface for holding the secondary battery cell of the battery holder,
The main body case is provided with a support rib for supporting the substrate placement surface of the battery holder,
The battery pack, wherein the support rib is thicker than the circuit board. The battery pack according to any one of claims 2 to 5,
The battery pack, wherein the circuit board has an electronic component arranged on the opposite side of the battery holder from the cell arrangement surface for holding the secondary battery cell. The battery pack according to any one of claims 2 to 6,
The circuit board is laminated in a posture not partially overlapping with the secondary battery cell,
In the non-overlapping region, a battery pack comprising a push switch that is partially exposed to the outside on the same side of the battery holder as the cell arrangement surface that holds the secondary battery cell. The battery pack according to any one of claims 1 to 7, further comprising:
A connector part detachably attached to the main body case;
A cable part for connecting the connector part and the body case;
With
The connector portion includes an output terminal for connecting to a battery-driven device to be fed,
The battery pack according to claim 1, wherein the main body case is formed with a terminal insertion hole for inserting the output terminal in a state where the connector portion is mounted. The battery pack according to claim 8, wherein
The main body case is provided with a cutout portion in which a portion for connecting the connector portion is cut out,
The battery pack according to claim 1, wherein the connector portion is formed so as to form an integral appearance with the main body case in a state where the connector portion is attached to the cutout portion of the main body case. The battery pack according to claim 8 or 9, wherein
The main body case includes a power supply connector for supplying power to the secondary battery cell,
A battery pack, wherein the power supply connector is closed in a state where the connector portion is mounted on a main body case.

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