JP2006164558A - Battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack that is further reduced in contour in addition to be reduced in size as whole, can simply and efficiently be assembled, and is improved in the rigidity of an outer package case. <P>SOLUTION: The battery pack has a thin type battery 2 with a rectangular outer periphery mounted to the outer package case 1 and an insulating sheet 4 adhered to the surface. The outer package case 1 has openings 3 for exposing front and rear faces of the thin battery, making the whole shape in a U shape by integrally molding parallel frames 1b and a coupling frame 1a covering three outer peripheral faces of the thin battery 2. Thicknesses of the parallel frames 1b and the coupling frame 1a are almost equal to that of the thin battery 2 or thinner. The coupling frame 1a has electrode windows 7 opened to take output terminals 8 outside. The insulation sheet 4 adhered to the front and rear faces of the thin battery 2 is adhered to one of the outer periphery faces of the thin battery not covered with the outer package case 1, and also adhered to front faces of each parallel frames 1b to fix the parallel frames to the thin battery 2 and fix the outer package case 1 to a constant position of the thin battery 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a battery pack in which a thin battery is fixed to an exterior case.

  Thin battery packs are conveniently used by being mounted on various portable electric devices. In particular, it is an optimum shape for an electric device that needs to be designed thin as a whole, such as a mobile phone. Since the battery pack of this shape cannot be thinned as long as the thin battery is not thinned, research has been conducted on how to thin the thin battery. Currently, polymer batteries are being developed as extremely thin thin batteries. Since the polymer battery uses an aluminum laminate film for the exterior, the entire battery can be made extremely thin. Furthermore, a thin battery of a lithium ion secondary battery using iron or aluminum for an outer can has been developed.

  Currently developed thin batteries such as polymer batteries and lithium ion secondary batteries have already been designed to be considerably thin. Furthermore, studies have been conducted to make these thin batteries thinner without reducing the charging capacity. In addition, a battery pack incorporating a thin battery is also designed to be thin. In particular, battery packs attached to devices that are required to be thinner, such as portable electric devices, are required to be designed to be thinner. For this reason, it is extremely important to design a thin battery pack without reducing the charging capacity of the thin battery, and a battery pack capable of realizing this is required.

For the purpose of realizing this, the present applicant has developed a battery pack in which an outer case having openings on both sides is fixed to the outer periphery of a thin battery, and the outer case is fixed to the thin battery with an insulating sheet ( Patent Document 1).
JP 2004-273174 A

  The battery pack described in this publication is shown in the exploded perspective view of FIG. In this battery pack, a thin battery 32 is attached to an outer case 31 formed of plastic in a rectangular frame shape, and an insulating sheet 34 is bonded to the surface of the thin battery 32. Further, the battery pack is formed in a rectangular frame shape that covers the both side surfaces and both end surfaces of the thin battery 32 by providing the outer case 31 with openings 33 for exposing the front and back surfaces of the thin battery 32 to the outside. . The thickness of the outer case 31 is equal to the thickness of the thin battery 32, or the outer case 31 is thinner than the thin battery 32. Further, the outer case 31 is divided into a first case 31A and a second case 31B on the front and back surfaces of the thin battery 32. The first case 31A and the second case 31B are formed into a rectangular frame shape by a side case portion 31a that covers the side surface of the thin battery 32 and an end case portion 31b that covers the end surface of the thin battery 32. The outer corner portion of the portion 31a is a curved surface. An insulating sheet 34 is bonded to the surface of the outer side surface of the side case portion 31a of the first case 31A and the second case 31B to connect the first case 31A and the second case 31B.

  The battery pack shown in FIG. 1 can be thinned until the overall thickness is substantially equal to that of a thin battery. However, the battery pack having this structure divides the outer case fixed to the outer periphery of the thin battery into two in the thickness direction, so that it takes time and labor to manufacture and assemble the outer case, and it is difficult to achieve sufficient strength. there were.

  The present invention has been developed for the purpose of solving this drawback. An important object of the present invention is to provide a battery pack in which the outer shape can be further reduced in addition to making the whole thin, and can be easily and efficiently assembled to make the outer case a tough structure.

The battery pack of the present invention has the following configuration in order to achieve the above-described object.
In the battery pack, a thin battery 2 having a thinner battery than its width and a rectangular outer periphery shape is attached to the outer case 1, and the insulating sheet 4 is bonded to the surface of the thin battery 2. The exterior case 1 has an opening 3 that exposes the front and back surfaces of the thin battery 2 to the outside, and covers the three outer peripheral surfaces of the thin battery 2 having a rectangular outer periphery so as to cover the parallel frame 1b and the connecting frame 1a. And the whole shape is formed in a U shape. The thicknesses of the parallel frame 1b and the connecting frame 1a are substantially equal to the thickness of the thin battery 2, or the outer case 1 is made thinner than the thin battery 2. The connection frame 1a of the outer case 1 opens the electrode window 7 and exposes the output terminal 8 from the electrode window 7 to the outside. The insulating sheet 4 bonded to the front and back surfaces of the thin battery 2 is bonded to one outer peripheral surface of the thin battery 2 that is not covered by the outer case 1 and is also bonded to the surface of the parallel frame 1b. Accordingly, the parallel frame 1 b is fixed to the thin battery 2, and the outer case 1 is fixed to a fixed position of the thin battery 2.

  In the present specification, “the thickness of the parallel frame 1b and the connecting frame 1a of the outer case 1 is“ approximately equal to the thickness of the thin battery 2 ”means not only a state in which the two match completely but also a battery pack. It is assumed that the difference is negligible in the state, for example, a state where the difference is 1 mm or less.

  In the battery pack of the present invention, the holder 5 and the circuit board 6 can be disposed between the connection frame 1 a of the outer case 1 and one outer peripheral surface of the thin battery 2. In this battery pack, the holder 5 can be connected to a fixed position of the connection frame 1a with a fitting structure. Furthermore, this battery pack has a fitting structure of the holder 5 and the connecting frame 1a, a fitting convex portion 16 provided on both sides of the holder 5, and a fitting provided on the connecting frame 1a for guiding the fitting convex portion 16. It can be comprised by the recessed part 17 or the fitting hole.

  In the battery pack of the present invention, the insulating sheet 4 can be U-curved on one outer peripheral surface that is not covered by the outer case 1 of the thin battery 2 and bonded to the front and back of the thin battery 2.

  In the battery pack of the present invention, the parallel case 1b and the connecting frame 1a can be integrally formed with the outer case 1 made of fiber-reinforced plastic.

  The battery pack of the present invention has a total thickness substantially equal to the thickness of the thin battery, and its outer shape is extremely reduced to a shape slightly larger than the outer shape of the thin battery, so that the whole can be made extremely compact. This is because the battery pack of the present invention covers three outer peripheral surfaces of a rectangular thin battery with a U-shaped outer case, and the outer case is fixed to the thin battery with an insulating sheet. The battery pack with this structure does not cover the front and back surfaces of a thin battery with an outer case as in the past, so the thickness of the entire battery pack can be the same as that of a thin battery while the thin battery is housed in the outer case. It is.

  Furthermore, unlike the conventional battery pack, the battery pack of the present invention is formed by integrally forming the parallel frame and the connecting frame without dividing the outer case fixed to the outer periphery of the thin battery into two in the thickness direction. Since it is an exterior case, it has the feature that it is easy and easy to manufacture and assemble the exterior case. In addition, the exterior case that is integrally molded without being divided has a feature that it can have a strong structure and a strong structure.

  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.

  The battery pack shown in FIGS. 2 to 5 has an outer case 1 connected to the outer periphery of a thin battery 2. The thin battery 2 is a secondary battery in which the thickness (t) is thinner than the width (W) and the outer shape is a square. In this specification, the outer periphery of a thin battery means the outer periphery of the front and back which is the maximum surface of a thin battery. Further, the front and back surfaces of the thin battery are surfaces that can be seen from the thickness direction that is the vertical direction in FIG. 5, and are the maximum surfaces that are configured by the width (W) and the length (L) in FIG. 5. . Further, the side surface of the thin battery is a surface that can be seen when the thin battery is viewed from the width direction, and is a surface composed of a thickness (t) and a length (L) in FIG. That is, in the thin battery 2 shown in FIG. 5, the side surfaces are two curved surfaces 2b positioned at the upper right and the lower left. Furthermore, the end surface of the thin battery is a surface that can be seen when the thin battery is viewed from the length direction, and is a surface composed of a width (W) and a thickness (t) in FIG. Accordingly, in the present specification, the outer peripheral surface of the thin battery means four surfaces including two side surfaces and two end surfaces.

  The thin battery 2 is a lithium ion battery or a polymer battery. The polymer battery is a lithium polymer battery. However, the present invention does not specify a thin battery as a lithium ion battery or a polymer battery. The thin battery may be a battery other than these batteries, for example, a nickel-hydrogen battery or a nickel-cadmium battery.

  The outer case 1 is manufactured by molding an insulating material. The insulating material of the outer case 1 is preferably plastic. As the plastic, a plastic in which fibers such as glass fiber and carbon fiber are embedded and reinforced, for example, PPS (polyphenylene sulfite) is suitable. PPS has extremely excellent strength. PPS can be reinforced with fibers to improve impact strength. Furthermore, since PPS is excellent in flame retardancy, for example, when PPS is used as the material of the exterior case, even if the plate thickness is reduced to 0.4 mm, the flame retardancy defined by the UL standard etc. Can meet the criteria. On the other hand, in polycarbonate, in order to satisfy this standard, a plate thickness of 0.8 mm or more is required. Therefore, PPS can make the outer case thinner while maintaining flame retardancy, and accordingly, downsizing of the battery pack can be achieved. However, plastic such as polycarbonate can be used as the plastic of the outer case, and therefore the plastic is not specified as PPS.

The exterior case 1 shown in the figure has an opening 3 that exposes the front and back surfaces of the thin battery 2 to the outside, and has a U-shape that covers the three outer peripheral surfaces of the thin battery 2 having a rectangular outer periphery. The outer case 1 does not cover the front and back surfaces of the thin battery 2. The outer case 1 has a pair of parallel frames 1b on both sides connected by a connecting frame 1a so that the overall shape is a U-shape. The exterior case 1 including the parallel frame 1b and the connection frame 1a is integrally formed of plastic as a whole. In the exterior case 1 shown in the figure, both end surfaces of the thin battery 2 are covered with the parallel frame 1b, and one side surface of the thin battery 2 is covered with the connecting frame 1a. Although not shown, the battery pack of the present invention can cover both side surfaces of the thin battery with a parallel frame and cover one end surface of the thin battery with a connecting frame.
As described above, the exterior case 1 having a shape covering the three outer peripheral surfaces of the thin battery 2 can cover all the wiring portions to the battery electrode and the circuit board, as will be described in detail later. For this reason, it is possible to reduce the size of the battery pack by ensuring the safety of these wiring portions and covering only the insulating sheet 4 on the surface opposite to the connection frame 1a.

  The width of the parallel frame 1 b and the connecting frame 1 a of the outer case 1 is approximately equal to the thickness of the thin battery 2 or thinner than the thin battery 2. In the outer case 1, the outer shape of the parallel frame 1 b and the connecting frame 1 a is set so as not to protrude from the front and back surfaces of the thin battery 2, and the battery pack is not thickened by the outer case 1.

  In the exterior case 1 shown in the figure, an electrode window 7 is opened in the connecting frame 1a, and the output terminal 8 is exposed to the outside from the electrode window 7. In the illustrated battery pack, the output terminal 8 is fixed to the circuit board 6 and the output terminal 8 is arranged on the inner surface of the connecting frame 1a. The circuit board 6 is disposed on the inner surface of the connection frame 1a. In order to arrange the circuit board 6 at a fixed position, a holder 5 is arranged between the circuit board 6 and the thin battery 2. The holder 5 is formed by integrally molding an insulating material such as plastic. The holder 5 is disposed between the circuit board 6 and the thin battery 2. In this battery pack, the connection frame 1a is disposed on the side surface of the thin battery 2, but the connection frame is disposed on one end surface of the thin battery, and the holder and the circuit board are disposed between the end surface of the thin battery and the connection frame. Can also be arranged.

  The circuit board 6 is mounted with an output terminal 8 and a protection circuit (not shown). The protection circuit is a circuit that protects the overcurrent of the thin battery 2 or PTC, or a circuit that prevents the thin battery 2 from being overcharged or overdischarged. In the illustrated battery pack, a protection element 11 that is a thermal fuse is used for one connection lead 9, but a protection element such as a thermal fuse is mounted on a circuit board, and both ends of the circuit board are connected to a thin battery by a lead plate. can do. In the battery pack, the circuit board can be connected to the thin battery by using PTC instead of the thermal fuse as a protection element and PTC as one connection lead.

  The holder 5 is sandwiched between the circuit board 6 and the thin battery 2. The holder 5 shown in the drawing is formed into a shape in which both ends and the middle of the vertical ribs 5A on both sides are connected by horizontal ribs 5B. The holder 5 is formed in such a shape that the circuit board 6 is connected to one surface and the other surface is fitted to the side surface of the thin battery 2. On the side where the circuit board 6 is connected to the holder 5, the contact edges of the vertical ribs 5A and the horizontal ribs 5B are located on the same plane. The side of the holder 5 to which the thin battery 2 is connected is formed into a shape that fits the side surface of the thin battery 2.

  The thin battery 2 has a curved surface 2b whose corners are chamfered so that both side surfaces are curved with a predetermined radius of curvature. Both side surfaces of the thin battery 2 which is the curved surface 2b have a center as a protrusion. The holder 5 is formed so that the surface facing the thin battery 2 can be fitted to the curved surface 2b of the thin battery 2 so that the thin battery 2 of this shape does not shift in the front-back direction. That is, the contact edge of the lateral rib 5B with the thin battery 2 is curved in a central recess, and the curved surface 2b of the thin battery 2 is fitted here. This shape of the holder 5 prevents the thin battery 2 from shifting in the front and back direction, and can connect the holder 5 and the thin battery 2.

  In the illustrated battery pack, both ends of the circuit board 6 are connected to positive and negative electrodes on both ends of the thin battery 2 via connection leads 9. In the battery pack of this figure, the connection lead 9 that connects one end of the circuit board 6 to the bottom electrode of the thin battery 2 is a lead plate 10, and the other end of the circuit board 6 is connected to the convex electrode 2 a of the thin battery 2. The lead 9 is a protective element 11. In the battery pack, a protection circuit can be mounted on a circuit board using both connection leads as lead plates.

  In the thin battery 2, an insulating plate 12 is laminated on the end face of the convex electrode 2a. The insulating plate 12 is provided with a through hole 12A through which the convex electrode 2a protrudes. The insulating plate 12 is bonded or fixed to the end face of the thin battery 2 via a double-sided adhesive tape to insulate the protective element 11 which is the connection lead 9 connected to the convex electrode 2 a from the end face of the thin battery 2. The connection lead 9 is connected to the electrode of the thin battery 2 by resistance spot welding or laser welding. Further, resistance spot welding, laser welding, or soldering is used to connect to the circuit board 6.

  The circuit board 6 and the holder 5 are connected to each other in a fixed position by a fitting structure. The battery pack fitting structure shown in the figure includes a fitting concave portion 13 provided on both sides of the circuit board 6 and a fitting convex portion 14 formed integrally with the plastic holder 5. The fitting convex portion 14 is provided at a position where it can be inserted into the fitting concave portion 13 of the circuit board 6 in a state where the circuit board 6 is coupled to a fixed position of the holder 5. The circuit board 6 and the holder 5 of this structure are connected to the circuit board 6 in a state where the fitting convex part 14 of the holder 5 is inserted into the fitting concave part 13 of the circuit board 6 and the circuit board 6 and the holder 5 are connected to a fixed position. The circuit board 6 is connected to the thin battery 2 through 9. When the circuit board 6 is connected to the thin battery 2, the holder 5 is sandwiched between the circuit board 6 and the thin battery 2 and fixed in place.

  As described above, the curved surface 2b of the thin battery 2 is fitted to the holder 5, the holder 5 is connected to a fixed position of the thin battery 2, and the holder 5 and the circuit board 6 are fixed to each other by a fitting structure. When the circuit board 6 is connected to the thin battery 2 via the connection leads 9, the circuit board 6, the holder 5, and the thin battery 2 are connected so that their relative positions are not shifted from each other.

  The outer case 1 is connected to the battery core 20 of the battery in which the thin battery 2, the holder 5, and the circuit board 6 are connected. The outer case 1 is connected to the battery core 20 such that the circuit board 6 and the holder 5 are disposed inside the connection frame 1 a and the parallel frame 1 b covers both end faces of the thin battery 2. As shown in FIG. 6, the exterior case 1 is provided with side walls 15 integrally formed on both sides of the connection frame 1a in order to connect the circuit board 6 and the holder 5 to each other. The circuit board 6 and the holder 5 are accommodated inside the side wall 15.

  The outer case 1 is connected to a fixed position of the battery core 20 so that the relative positions are not shifted from each other with the connecting frame 1a and the holder 5 as a fitting structure. The fitting structure of the holder 5 and the connecting frame 1a is composed of a fitting convex portion 16 provided protruding from both sides of the holder 5 and a fitting concave portion 17 provided on the side wall 15 of the connecting frame 1a. The fitting concave portion 17 is provided at a position where the fitting convex portion 16 is inserted in a state where the holder 5 is disposed at a fixed position of the connecting frame 1a. The fitting recess 17 in the figure is a fitting hole provided in the connecting frame 1a. The fitting concave portion can be a concave portion into which the fitting convex portion is inserted. Although not shown, contrary to the fitting structure in the figure, a projection is provided on the inner surface of the connecting frame to provide a fitting convex portion, and a fitting concave portion for guiding the fitting convex portion is provided in the holder. It is also possible to connect the case to a fixed position.

  In the fitting structure shown in the figure, the outer shape of the fitting convex portion 16 is an arrow shape having a tip on the connection frame 1a side, and the inner shape of the fitting concave portion 17 is an arrow shape for guiding the fitting convex portion 16. . The fitting structure of this shape is elastically deformed so that the opening of the fitting recess 17 is gradually expanded or pushed up as the tip of the arrow of the fitting projection 16 is inserted into the fitting recess 17. When the width of the fitting convex portion 16 exceeds the widest point, the elastic projection is restored to prevent the fitting convex portion 16 from coming off. In this way, the arrow-shaped fitting convex portion 16 can be securely connected at the rear end of the wide portion of the arrow while being smoothly inserted at the tip of the arrow so that the connecting portion is not detached. . In the illustrated fitting shape, the fitting convex portion 16 and the fitting concave portion 17 are arrow-shaped, but the fitting convex portion and the fitting concave portion can be all other fitting shapes that cannot be pulled out. For example, the fitting projection can be hook-shaped with the tip as an inclined surface and the rear end as a vertical surface, and the fitting recess can be connected so that it cannot be pulled out as a shape that can be fitted with the hook-shaped fitting projection.

  The exterior case 1 shown in the figure is provided with a fitting recess 17 at the edge of the side wall 15 of the connecting frame 1 a and a fitting projection 16 so as to protrude outside the vertical rib 5 </ b> A of the holder 5. The fitting concave portion 17 and the fitting convex portion 16 are provided at both ends and in the middle. The outer case 1 having this structure is connected to a fixed position of the battery core 20 by connecting the connecting frame 1a to the holder 5 with a fitting structure.

  An insulating sheet 4 such as a label is attached to the battery core 20 to which the outer case 1 is connected. The insulating sheet 4 is bonded to the front and back surfaces of the thin battery 2 and the outer case 1. In the illustrated battery pack, the insulating sheet 4 is U-curved on one outer peripheral surface that is not covered by the outer case 1 of the thin battery 2, that is, the side surface located at the upper right of the thin battery 2 in FIG. Glued. The insulating sheet 4 connects the outer case 1 to the thin battery 2. Therefore, the insulating sheet 4 is also bonded to both side surfaces and the surface of the parallel frame 1b of the exterior case 1.

  The sectional view of FIG. 7 is a sectional view of the parallel frame 1b and shows a state in which the insulating sheet 4 is bonded. As shown in the developed view of FIG. 8, the insulating sheet 4 has bent pieces 4 </ b> A protruding on both sides of the insulating sheet 4 bonded to the upper surface of the thin battery 2. As shown in FIG. 7, the bent piece 4A is bent at a right angle and bonded to the surface of the parallel frame 1b, and further bent at a right angle and bonded to the back surface of the thin battery 2 from the side surface of the parallel frame 1b. . The insulating sheet 4 is bonded to the back surface of the thin battery 2 on the folded piece 4A bonded to the back surface. In the thin battery 2 to which the insulating sheet 4 is bonded in this state, the insulating sheet 4 is laminated in two layers on both sides of the back surface. For this reason, the thickness of the battery pack is slightly increased on both sides. However, when the thin battery 2 is charged and discharged, the center of the thin battery 2 slightly expands and becomes substantially thick. At this time, both sides of the thin battery 2 do not swell. For this reason, even if both sides of the thin battery 2 become slightly thick, they are absorbed by the swelling of the central portion.

  The insulating sheet 4 is also bonded to both sides of the connecting frame 1 a of the outer case 1. As shown in the enlarged cross-sectional view of FIG. 6, the connecting frame 1 a has a bonding surface of the insulating sheet 4 as a stepped surface 18 that is lowered correspondingly to the thickness of the insulating sheet 4. In FIG. 5, a ridge 19 having a height corresponding to the thickness of the insulating sheet 4 is provided above the step surface 18, and the surface of the ridge 19 and the insulating sheet 4 is the same surface.

  The insulating sheet 4 is a flexible plastic sheet or label. The insulating sheet 4 is bonded to the thin battery 2 and the outer case 1 via an adhesive, or is bonded via an adhesive layer.

It is a disassembled perspective view of the conventional battery pack. It is a perspective view of the battery pack concerning one Example of this invention. It is the perspective view which turned the battery pack shown in FIG. 2 upside down. FIG. 3 is an exploded perspective view of the battery pack shown in FIG. 2. It is a disassembled perspective view of the battery pack shown in FIG. FIG. 3 is a cross-sectional view of the battery pack shown in FIG. FIG. 3 is a cross-sectional view of the battery pack shown in FIG. It is an expanded view of an insulating sheet.

Explanation of symbols

1 ... Exterior case 1a ... Connection frame
1b ... Parallel frame 2 ... Thin battery 2a ... Convex electrode
2b ... curved surface 3 ... opening 4 ... insulating sheet 4A ... bent piece 5 ... holder 5A ... vertical rib
5B ... Horizontal rib 6 ... Circuit board 7 ... Electrode window 8 ... Output terminal 9 ... Connection lead 10 ... Lead plate 11 ... Protection element 12 ... Insulating plate 12A ... Through-hole 13 ... Fitting recess 14 ... Fitting protrusion 15 ... Side wall DESCRIPTION OF SYMBOLS 16 ... Insertion convex part 17 ... Insertion recessed part 18 ... Step surface 19 ... Convex strip 20 ... Battery core 31 ... Exterior case 31A ... 1st case
31B ... 2nd case
31a ... Side case part
31b ... End case part 32 ... Thin battery 33 ... Opening part 34 ... Insulating sheet

Claims (5)

Attach a thin battery (2) with a thinner battery than the width and a rectangular outer periphery shape to the outer case (1), and attach an insulating sheet (4) to the surface of the thin battery (2). A battery pack comprising:
The outer case (1) has an opening (3) that allows the front and back surfaces of the thin battery (2) to be exposed to the outside, and covers the three outer peripheral surfaces of the thin battery (2) having a rectangular outer periphery. The parallel frame (1b) and the connecting frame (1a) are integrally formed to form an overall U shape, and the parallel frame (1b) and the connecting frame (1a) are thin. It is almost equal to the thickness of the battery (2), or the outer case (1) is thinner than the thin battery (2),
The connecting frame (1a) of the outer case (1) opens the electrode window (7), and the output terminal (8) is exposed to the outside from the electrode window (7).
Furthermore, the insulating sheet (4) adhered to the front and back surfaces of the thin battery (2) is adhered to one outer peripheral surface of the thin battery (2) not covered by the outer case (1), and the parallel frame (1b) The battery pack is formed by adhering to the surface of the battery, fixing the parallel frame (1b) to the thin battery (2) with the insulating sheet (4), and fixing the thin frame (2) to a fixed position.   A holder (5) and a circuit board (6) are arranged between the connecting frame (1a) of the outer case (1) and one outer peripheral surface of the thin battery (2). The battery pack according to claim 1, wherein the battery pack is connected to a fixed position of the connection frame (1 a) in a combined structure.   The fitting structure of the holder (5) and the connecting frame (1a) includes a fitting protrusion (16) provided on both sides of the holder (5), and a fitting protrusion (16) provided on the connecting frame (1a). The battery pack according to claim 2, wherein the battery pack is a fitting recess (17) or a fitting hole.   The insulating sheet (4) is U-curved at one outer peripheral surface that is not covered by the outer case (1) of the thin battery (2), and is adhered to the front and back of the thin battery (2). Battery pack. The battery pack according to claim 1, wherein the outer case (1) is made of fiber reinforced plastic, and the parallel frame (1b) and the connecting frame (1a) are integrally formed.

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