JP2006164559A - Battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively mass-produce a battery pack that is reduced in thickness and weight as a whole while being enabled to securely hold thinned batteries so as not to be fallen from an outer package case, and further more, can efficiently be assembled. <P>SOLUTION: The battery pack houses a battery core 20 in a outer package case 1. The outer package case 1 is integrally molded into a box shape composed of a surface plate 13 covering one side of the thin-type battery 2 and a rectangular frame body 14. The outer package case 1 has output terminals 8 of a battery core 20 taken out of electrode windows 7 with one of the frame bodies 14 as as a coupling frame 14A. The coupling frame 14A has an eaves 16 integrally molded with the surface plate 13 along a side edge at an opposite side, and has a fit-in groove 17 formed between the eaves 16 and the surface plate 13, and the battery core 20 is put in the fit-in groove 17 to be arranged at a constant position. The battery pack adheres an insulation sheet 4 to the surface of the thin-type battery and the frame bodies 14, and blocks an opening 15 of the outer package case 1 with the insulation sheet 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a battery pack in which a thin battery is housed in an outer case.

  Thin battery packs are conveniently used by being mounted on various portable electric devices. In particular, it is an optimal shape for an electric device such as a mobile phone or PDA that needs to be thinned as a whole. 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. (See Patent Document 1).

  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 mounted on 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. The first case 31A and the second case 31B are connected to each other by bonding an insulating sheet 34 to the outer surface of the side case portion 31a of 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.

Moreover, since the battery pack of this structure obstruct | occludes the opening part of both surfaces of an exterior case with an insulating sheet, it is difficult to make both surfaces of a thin battery into sufficient intensity | strength. As a battery pack that eliminates this drawback, the present applicant has a battery pack in which both sides of the frame are closed with a metal plate, and a plastic in which one side is closed with a metal plate and the other side is integrally molded with the frame. A battery pack closed with a plate was developed (see Patent Document 2).
JP 2004-273174 A JP 2004-273371 A

  Since the battery pack described in Patent Document 2 covers both sides of the frame with a metal plate or a plastic plate, both sides of the thin battery can have a tough structure. However, the battery pack having this structure has a drawback of becoming heavy.

  The inventor has a battery pack in which one side of a frame is closed with a plastic plate formed integrally with the plastic of the frame to open one side, and the opening is closed with an insulating sheet to reduce the overall weight. Developed. Since this battery pack covers one side of the thin battery with a plastic plate and the other side with an insulating sheet, the whole can be lightened. However, the battery pack having this structure has a drawback that it is difficult to prevent the displacement between the thin battery and the outer case in use, and it is difficult to hold the thin battery so as not to come out of the outer case. .

  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 that can be thin and light as a whole, and can be efficiently assembled and mass-produced at low cost while firmly holding a thin battery so as not to come out of the outer case. .

The battery pack of the present invention has the following configuration in order to achieve the above-described object.
The battery pack houses a battery core 20 including a thin battery 2 having a battery thickness smaller than the width and an output terminal 8 for taking out positive and negative electrodes of the thin battery 2 to the outside. . The outer case 1 is made of plastic, and a rectangular frame 14 surrounding the outer periphery of the battery core 20 is integrally formed around the rectangular surface plate 13 that covers one side of the thin battery 2. The battery core 20 is housed in a box-shaped outer case 1 made up of a frame 14. Further, the outer case 1 has one of the frame bodies 14 as a connecting frame 14 </ b> A provided with the electrode window 7, and the output terminal 8 of the battery core 20 is exposed from the electrode window 7 to the outside. This connecting frame 14A is provided with an eave 16 integrally formed along the side edge opposite to the side edge connecting the surface plate 13. The outer case is provided with a fitting groove 17 into which the end of the battery core 20 on the output terminal 8 side is fitted between the eaves 16 and the surface plate 13, and the battery core 20 is inserted into the fitting groove 17. The output terminal 8 is arranged at a fixed position. Further, the battery pack is formed by adhering the insulating sheet 4 to the surface of the thin battery 2 and the frame 14 so as to close the opening 15 of the frame 14, and with the insulating sheet 4, the opening 15 of the outer case 1. Is blocked.

  In the battery pack of the present invention, the circuit board 6 on which the output terminal 8 is fixed can be connected to the thin battery 2 to form the battery core 20. In the battery core 20, the substrate holder 5 can be disposed between the circuit substrate 6 and the thin battery 2.

  Furthermore, the battery pack of this invention can connect the board | substrate holder 5 and the eaves 16 with a fitting shape, and can arrange | position the battery core 20 in a fixed position. The fitting structure between the substrate holder 5 and the eaves 16 can be a fitting convex portion 18 provided on the substrate holder 5 and a fitting concave portion 19 provided on the eaves 16 to guide the fitting convex portion 18.

  Furthermore, the battery pack of the present invention can connect the circuit board 6 to a fixed position of the board holder 5 by using the circuit board 6 and the board holder 5 as the fitting structure. Furthermore, in the battery pack of the present invention, the outer can of the thin battery 2 can be a metal case.

  The battery pack of the present invention is characterized in that, in use, the thin battery and the outer case can be prevented from being displaced and the thin battery can be securely held so as not to come out of the outer case. That is, the battery pack of the present invention integrally molds the outer case that houses the battery core into a box shape composed of a surface plate and a frame, and one of the frames serves as a connecting frame that exposes the output terminal. The eaves are integrally formed along the side edge of the connecting frame on the side opposite to the surface plate, and the battery core is inserted into the insertion groove provided between the eaves and the surface plate. This is because it is inserted and placed at a fixed position. The battery pack with this structure is arranged in a state where the battery core is fitted in the fitting groove provided in the outer case, so that the thin battery is held in a fixed position while preventing the positional deviation between the thin battery and the outer case. It is hard to come off the case.

  In particular, the battery pack according to the present invention has an advantage that the output terminal of the battery core can be firmly held at a fixed position of the outer case because the battery core is inserted by providing the insertion groove in the connecting frame provided with the electrode window. The battery pack having this structure can easily and easily arrange the output terminal at a fixed position of the outer case, so that it is possible to improve the efficiency of assembling the battery pack and to realize a feature that can be mass-produced at low cost.

  Furthermore, the battery pack of the present invention has an insulating sheet bonded to the surface of the thin battery and the frame body while the battery core is inserted into the insertion groove of the outer case and held in place, and the outer sheet is opened with the insulating sheet. Since the portion is closed, the entire battery can be made thinner and lighter while holding the thin battery firmly so as not to come out of the outer case.

  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 6 accommodates a battery core 20 including a thin battery 2 and an output terminal 8 for taking out the positive and negative electrodes of the thin battery 2 to the outside. 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. 4, and are the maximum surfaces that are configured by the width (W) and the length (L) in FIG. 4. . Furthermore, the single side | surface of a thin battery shall mean one side of the front and back which is the maximum surface. Furthermore, the outer periphery of the battery core means the outer periphery of the front and back surfaces, which is the maximum surface of the battery core in which the output terminal is connected to the thin battery.

  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 integrally molding the whole with 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 thin battery 2 is housed in the outer case 1 in the state of the battery core 20. The battery core 20 includes a circuit board 6, a board holder 5, and a thin battery 2. The battery core 20 is obtained by connecting the circuit board 6 to the thin battery 2 via the board holder 5. The battery core 20 has the output terminal 8 fixed to the circuit board 6. The output terminal 8 is exposed to the outside from the electrode window 7 provided in the exterior case 1.

  In the battery core 20, the substrate holder 5 is disposed between the circuit substrate 6 and the thin battery 2. The substrate holder 5 is formed by integrally molding an insulating material such as plastic. The circuit board 6 has an output terminal 8 fixed to the surface. The circuit board 6 is mounted with a battery 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, the circuit board 6 is connected to the thin battery 2 with the PTC as the protection element 11 as one connection lead 9, but a protection element such as PTC or a thermal fuse is mounted on the circuit board, Both ends of the circuit board can be connected to the thin battery by a lead plate. In addition, the battery pack can connect the circuit board to the thin battery by using the protective element as a temperature fuse instead of the PTC and using one connection lead as the temperature fuse.

  The substrate holder 5 is sandwiched between the circuit substrate 6 and the thin battery 2. The circuit board 6 is connected to one surface of the substrate holder 5, and the other surface is connected to the convex electrode surface 2 </ b> A of the thin battery 2. The board holder 5 is provided with a positioning wall 5A along one side edge on the side where the circuit board 6 is connected, and the circuit board 6 is arranged along the positioning wall 5A. A side of the substrate holder 5 where the thin battery 2 is connected is provided with a concave portion 5B for guiding the convex electrode 2a of the thin battery 2.

  In the illustrated battery pack, both ends of the circuit board 6 are connected to positive and negative electrodes of the thin battery 2 via connection leads 9, and the circuit board 6 is connected to the thin battery 2 via connection leads 9. In the illustrated battery pack, one connection lead 9 is connected as a protective element 11 to the convex electrode 2a of the thin battery 2, and the other connection lead 9 is connected as a lead plate 10 to the sealing plate 2b. In the illustrated battery pack, one connection lead 9 is used as the protective element 11, but both connection leads can be used as lead plates.

  The connection lead 9 connected to the convex electrode 2a needs to be insulated from the sealing plate 2b. This is because the sealing plate 2b and the convex electrode 2a are different electrodes. The lithium ion secondary battery, which is a thin battery 2, has a convex electrode 2a as a negative electrode and a sealing plate 2b and an outer can as a positive electrode. The outer can of the thin battery 2 can be a metal case. In the illustrated battery pack, since the connection lead 9 connected to the convex electrode 2a is used as the protection element 11, insulation is provided between the protection element 11 which is the connection lead 9 connected to the convex electrode 2a and the sealing plate 2b. A plate 12 is provided to insulate the connection lead 9 from the sealing plate 2b. The insulating plate 12 is bonded or fixed to the end surface of the thin battery 2 via a double-sided adhesive tape to insulate the connection lead 9 connected to the convex electrode 2a from the sealing plate 2b. 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 is connected to a fixed position of the board holder 5 with a fitting structure. The substrate holder 5 shown in the figure is provided with a positioning wall 5A along one side edge, and has a positioning projection 5C protruding in the vertical direction at the central portion. The circuit board 6 is arranged in contact with the convex portion 5 </ b> C, and the circuit board 6 is connected to a fixed position of the board holder 5. The substrate holder 5 positions the side surface of the circuit board 6 in contact with the inner surface of the positioning wall 5A to position in the lateral direction orthogonal to the longitudinal direction of the circuit board 6, and further, the end surface of the circuit board 6 is positioned on the positioning convex portion 5C. The longitudinal direction is positioned in contact with each other. Further, the circuit board 6 is connected so as not to be detached from the board holder 5 via connection leads 9 connected to both ends. The substrate holder 5 of FIG. 4 is provided with a lead groove 5D for guiding the lead plate 10 connected to the circuit board 6 on the right end surface in this figure, and the lead plate 10 is guided to the lead groove 5D. Furthermore, in order to prevent the circuit board 6 from being displaced in a direction perpendicular to the surface of the circuit board 6, the board holder 5 is connected to the inner surface of the positioning wall 5A and the side edge facing the positioning wall 5A. A mounting portion 5E for contacting the back surface of the substrate 6 is provided. The mounting portion 5E is formed lower than the positioning wall 5A. The circuit board 6 is prevented from shifting in the vertical direction by bringing the back surface of the circuit board 6 into contact with the mounting portion 5E of the substrate holder 5. With the above-described fitting structure, the circuit board 6 is connected to the fixed position of the board holder 5 so as not to be displaced. However, the circuit board and the board holder can be connected to each other in a fixed position by a fitting structure or a locking structure.

  The circuit board 6 is connected to the thin battery 2 through the connection leads 9 in a state of being connected to a fixed position of the board holder 5. When the circuit board 6 is connected to the thin battery 2, the substrate holder 5 is sandwiched between the circuit board 6 and the thin battery 2 and is disposed at a fixed position. The above battery core 20 connects the substrate holder 5 and the circuit board 6 to each other in a fixed position, and connects the circuit board 6 to the thin battery 2 via the connection leads 9. The thin batteries 2 can be connected so that their relative positions do not deviate from each other.

  The outer case 1 is made of plastic, and a rectangular frame 14 surrounding the outer periphery of the battery core 20 is integrally formed around a rectangular surface plate 13 that covers one side of the thin battery 2. The outer case 1 has a box shape with the surface plate 13 and the frame body 14, and the battery core 20 is accommodated in the outer case 1. The surface plate 13 covers one side of the thin battery 2 of the battery core 20. The outer case 1 does not cover the front and back surfaces of the thin battery 2 of the battery core 20. The surface not covered with the surface plate 13 is in the opening 15 of the frame body 14 and is covered with the insulating sheet 4.

  The rectangular frame 14 is composed of four sides. One of the four sides is a connecting frame 14A, and an electrode window 7 is provided in the connecting frame 14A. The electrode window 7 exposes the output terminal 8 of the battery pack to the outside. Therefore, the output terminal 8 is disposed inside the electrode window 7. The output terminal 8 is fixed to the circuit board 6 and disposed inside the electrode window 7.

  The connecting frame 14 </ b> A is formed by integrally forming the eaves 16. The eaves 16 are provided along the side edge opposite to the side edge provided by connecting the surface plate 13 along the upper edge in FIG. The connecting frame 14 </ b> A is provided with a fitting groove 17 between the eaves 16 and the surface plate 13 for fitting the end of the battery core 20 on the output terminal 8 side. The battery core 20 is inserted into the insertion groove 17 and disposed at a fixed position of the outer case 1. In this state, the battery core 20 arranged in the exterior case 1 arranges the circuit board 6 at a fixed position, and arranges the output terminal 8 fixed to the circuit board 6 at a fixed position inside the electrode window 7. .

  The battery pack shown in FIG. 7, which is a cross-sectional view of FIG. 6 and a partially enlarged view thereof, places the substrate holder 5 of the battery core 20 and the circuit board 6 in the insertion groove 17, and places the battery core 20 in a fixed position of the outer case 1. Is arranged. However, although not shown, the battery pack of the present invention can be placed at a fixed position of the outer case by inserting the circuit board of the battery core, the substrate holder, and a part of the thin battery into the fitting groove.

  The battery pack shown in the cross-sectional views of FIGS. 6 and 7 includes the circuit board 6 and the board holder 5 of the battery core 20 placed in the fitting groove 17 of the connecting frame 14A, and the battery core 20 is disposed at a fixed position of the outer case 1. To do. In this connection frame 14A, the width of the eaves 16 is set such that the opening edge is in contact with the sealing plate 2b. In this battery pack, the outer surface of the eaves 16 is flush with the surface of the thin battery 2, and the connecting frame 14 </ b> A has a width that does not protrude from the surface of the thin battery 2. The battery pack can be thinned as a whole so that all parts of the frame body 14 have a width that does not protrude from the surface of the thin battery 2. As shown in the enlarged cross-sectional view of FIG. 7, the fitting shape of the outer case 1 and the battery core 20 is such that the fitting protrusions 18 projecting on both sides of the substrate holder 5 and the connecting frame 14 </ b> A of the outer case 1. It consists of a fitting recess 19 provided in the surface plate 13 and the eaves 16. The exterior case 1 shown in the figure has fitting recesses 19 in both the surface plate 13 and the eaves 16. The surface plate 13 and the fitting recess 19 of the eaves 16 are provided at a position where the fitting convex portion 18 is inserted in a state where the substrate holder 5 is placed in the fitting groove 17 of the connecting frame 14A of the outer case 1 and placed in a fixed position. Yes. The fitting recess 19 of the illustrated outer case 1 is a fitting hole provided in the surface plate 13 and the eaves 16.

  The fitting convex portion 18 can insert the battery core 20 into the fitting groove 17 and enter the fitting concave portion 19, but the battery core 20 cannot be removed from the fitting groove 17 in the state of being inserted into the fitting concave portion 19. It has a shape. The fitting projection 18 of this shape can smoothly put the battery core 20 into the fitting groove 17 of the connection frame 14A, and the contact pressure acting on the output terminal 8 can be firmly applied by the connection frame 14A of the outer case 1. It can support and the position shift of the output terminal 8 can be prevented. When the battery pack is set in the electric device, the connection terminal of the electric device is elastically pressed to the output terminal 8 and a contact pressure acts. That is, the output terminal 8 is elastically pressed by the contact pressure. The position of the output terminal 8 due to the contact pressure causes a contact failure. For this reason, it is important that the position of the output terminal 8 does not shift due to the contact pressure. The battery pack shown in the figure supports the contact pressure acting on the output terminal 8, that is, the contact pressure acting on the circuit board 6 fixing the output terminal 8, with the fitting shape of the outer case 1 and the battery core 20. .

  When the battery core 20 is pulled out from the insertion groove 17 of the connecting frame 14A, the direction of the force acting on the fitting recess 19 and the fitting projection 18 and the force acting when the contact pressure acts on the output terminal 8 are in the direction. Match. For this reason, the fitting shape of the battery core 20 and the outer case 1 that prevents the battery core 20 from coming out of the fitting groove 17 is such that the contact pressure acts on the output terminal 8 and the output terminal 8 and the circuit board 6 are displaced. To prevent. The fitting shape shown in the figure includes a contact surface between the fitting convex portion 18 and the fitting concave portion 19 that are pressed against each other when the battery core 20 is pulled out from the fitting groove 17, and a right side surface of the fitting convex portion 18 in FIG. The left side surface of the fitting recess 19 is a vertical surface perpendicular to the surfaces of the surface plate 13 and the eaves 16 so that the battery core 20 does not come out of the insertion groove 17.

  In the illustrated fitting shape, the fitting concave portion 19 is a through hole, but the fitting concave portion can be a concave portion into which the fitting convex portion is inserted. Although not shown in the figure, opposite to the fitting shape in the figure, the inner surface of the surface plate and the eaves is provided with a fitting convex portion, and a fitting concave portion for guiding the fitting convex portion is provided in the substrate holder, It is also possible to connect the substrate holder and the outer case in place.

  The battery pack closes the opening 15 of the frame 14 by attaching an insulating sheet 4 such as a label in a state where the battery core 20 is put in the outer case 1. The insulating sheet 4 is bonded to one side of the thin battery 2 and the outer case 1. In the illustrated battery pack, the insulating sheet 4 is bonded to the four sides of the frame body 14 of the exterior case 1, and both side edges of the insulating sheet 4 are U-curved on both sides of the frame body 14, Bonded to the edge. The insulating sheet 4 holds the battery core 20 inside the outer case 1.

  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.

  Further, the thin battery 2 placed in the frame 14 of the outer case 1 can be fixed to the inner surface of the surface plate 13 with an adhesive, or with a double-sided adhesive tape 21. The adhesive or the double-sided adhesive tape 21 adheres the end of the thin battery 2 opposite to the connection frame 14 </ b> A or the peripheral edge of the thin battery 2 to the inner surface of the surface plate 13 or the entire surface to the surface plate 13.

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. FIG. 3 is an exploded perspective view of the battery pack shown in FIG. 2. FIG. 4 is an exploded perspective view of the battery pack shown in FIG. 3. FIG. 3 is a bottom view of the battery pack shown in FIG. 2. FIG. 3 is a cross-sectional view of the battery pack shown in FIG. It is a partially expanded sectional view of the battery pack shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Exterior case 2 ... Thin battery 2A ... Convex part electrode surface
2a ... convex electrode
2b ... Sealing plate 4 ... Insulating sheet 5 ... Substrate holder 5A ... Positioning wall
5B ... recess
5C ... Positioning convex part
5D ... Lead groove
5E: Mounting portion 6 ... Circuit board 7 ... Electrode window 8 ... Output terminal 9 ... Connection lead 10 ... Lead plate 11 ... Protection element 12 ... Insulating plate 13 ... Surface plate 14 ... Frame body 14A ... Connection frame 15 ... Opening portion 16 ... eaves 17 ... fitting groove 18 ... fitting convex part 19 ... fitting concave part 20 ... battery core 21 ... double-sided adhesive tape 31 ... outer case 31A ... first case
31B ... 2nd case
31a ... Side case part
31b ... End case part 32 ... Thin battery 33 ... Opening part 34 ... Insulating sheet

Claims (6)

A battery core (20) comprising a thin battery (2) whose thickness is thinner than the width and an output terminal (8) for taking out the positive and negative electrodes of the thin battery (2) to the outside is provided with an outer case (1 ), The battery pack stored in
The outer case (1) is made of plastic, and a rectangular frame (14) surrounding the outer periphery of the battery core (20) is integrally formed around the rectangular surface plate (13) that covers one side of the thin battery (2). The battery core (20) is housed in a box-shaped outer case (1) consisting of a surface plate (13) and a frame (14).
Further, the outer case (1) has one of the frames (14) as a connecting frame (14A) provided with an electrode window (7), and the output terminal (8) of the battery core (20) as the electrode window (7). From the outside,
Furthermore, the connecting frame (14A) is formed by integrally forming the eaves (16) along the side edge opposite to the side edge connecting the surface plate (13), and the eaves (16). And the surface plate (13) are provided with a fitting groove (17) for fitting the end of the battery core (20) on the output terminal (8) side, and the battery core (20) is inserted into the fitting groove (17). Put the output terminal (8) of the battery core (20) in place,
Further, the insulating sheet (4) is adhered to the surface of the thin battery (2) and the frame (14) so as to close the opening (15) of the frame (14), and the insulating sheet (4) is used. A battery pack formed by closing the opening (15) of the outer case (1).   The battery pack according to claim 1, wherein the battery core (20) connects the circuit board (6) to which the output terminal (8) is fixed to the thin battery (2).   The battery pack according to claim 2, wherein the battery core (20) has a substrate holder (5) disposed between the circuit board (6) and the thin battery (2).   The battery holder (5) and the eaves (16) are connected in a mating shape to place the battery core (20) in a fixed position, and the mating structure of the board holder (5) and eaves (16) The battery according to claim 3, which is an insertion convex portion (18) provided on the holder (5) and an insertion concave portion (19) provided on the eaves (16) for guiding the insertion convex portion (18). pack.   The battery core (20) is described in claim 3, wherein the circuit board (6) is connected to a fixed position of the board holder (5), with the circuit board (6) and the board holder (5) being fitted. Battery pack. The battery pack according to claim 1, wherein the outer can of the thin battery (2) is a metal case.

Images