JP4947893B2 - Battery pack - Google Patents

Description

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

A battery pack has been developed in which a terminal holder that fixes an output terminal is connected to the convex electrode surface of a thin battery to form a battery core, and the battery core is housed and assembled in a fixed position on the outer case (patent) Reference 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, plastic is molded to form a terminal holder 35, to which output terminals 38 are fixed. The plastic terminal holder 35 is disposed on the convex electrode surface 32 </ b> A of the thin battery 31 via the insulating plate 37. The terminal holder 35 is sandwiched between the first outer case 31 </ b> A and the second outer case 31 </ b> B that are divided into two on the front and rear surfaces of the thin battery 32, and is disposed at a fixed position.

  In the battery pack having this structure, the terminal holder 35 is sandwiched by the outer case 31 divided into two parts and arranged at a fixed position. It is important to arrange the terminal holder 35 at a fixed position of the battery pack. This is because the output terminal 38 is held so as not to be displaced. When the battery pack is set in the electric device, the connection terminal of the electric device is elastically pressed to the output terminal. This is to prevent poor contact between the connection terminal and the output terminal. Therefore, the output terminal is elastically pressed by the contact pressure. If the position of the output terminal shifts due to the contact pressure, contact failure tends to occur. For this reason, it is important to design the battery pack so that the position of the output terminal does not shift due to the contact pressure. In the battery pack of Patent Document 1, the terminal holder is sandwiched from both sides with an outer case and held in place. In order to sandwich the terminal holder in this state, as shown in FIG. 1, it is necessary to divide the outer case into two parts on the front and back of the thin battery, and the outer case is integrally molded as a single part. Can not.

  The applicant has developed a battery pack shown in the exploded perspective view of FIG. 2 in order to eliminate this drawback. In the battery pack of this figure, the output terminal 48 is fixed to the circuit board 46, and the circuit board 46 is connected to a fixed position on the convex electrode surface 42 </ b> A of the thin battery 42 via the board holder 45. In this battery pack, the contact pressure acting on the output terminal 48 is supported by the convex electrode surface 42 </ b> A of the thin battery 42 via the substrate holder 45. For this reason, the structure of the exterior case 41 can be simplified.

However, the battery pack of FIG. 2 has a drawback that it takes time to assemble the battery core 40 by connecting the circuit board 46 to the thin battery 42 via the board holder 45. This is because the battery core 40 is assembled as follows in the steps shown in FIGS.
(1) As shown in FIG. 3, an insulating plate 47 is bonded to the convex electrode surface 42 </ b> A of the thin battery 42. The insulating plate 47 is disposed to insulate the lead plate 43 that connects the circuit board 46 to the convex electrode 42a of the thin battery 42 from the sealing plate 42b that is an electrode different from the convex electrode 42a.
(2) As shown in FIG. 4, the lead plate 43 is connected to the both ends of the circuit board 46 by spot welding.
(3) As shown in FIG. 5, a PTC lead 49A, which is a protective element 49 and is also used as a lead plate, is connected to the convex electrode 42a of the thin battery 42 by spot welding.
(4) As shown in FIG. 6, the lead plate 43 connected to the circuit board 46 is connected to the sealing plate 42b of the thin battery 42 by spot welding.
(5) As shown in FIG. 7, the substrate holder 45 is disposed on the convex electrode surface 42A. As shown by the arrows in FIG. 8, the lead plate 43 connected to the sealing plate 42b is bent, and the circuit board 46 is set at a fixed position of the board holder 45 as shown in FIG. After that, as shown in FIG. 10, the other lead 49B of the PTC and the lead plate 43 of the circuit board 46 are connected by spot welding.
(6) As shown in FIG. 11, the connecting portion between the lead 49B of the PTC and the lead plate 43 is bent upward as indicated by an arrow, and placed on the upper surface of the substrate holder 45 as shown in FIG.

  The battery core assembled by the above process takes time to assemble, and in order to insulate one lead plate and the sealing plate, it is necessary to adhere the insulating plate to the surface of the sealing plate, and the number of parts used There are many disadvantages.

  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 uses a small number of parts, can be easily and easily assembled, and can be efficiently and mass-produced at low cost.

The battery pack of the present invention has the following configuration in order to achieve the above-described object.
In the battery pack, the circuit board 6 is connected to the convex electrode surface 2A of the thin battery 2 whose thickness is smaller than the width via the plastic substrate holder 5 to form a battery core 20, and the battery core 20 is connected to the convex electrode surface 2A. It is stored in the outer case 1. The circuit board 6 is connected to the thin battery 2 via the first lead 11 connected to the convex electrode 2a and the second lead 12 connected to the other electrode, and the circuit board 6 and the convex electrode surface 2A. The substrate holder 5 is sandwiched between the two. The substrate holder 5 connects the circuit substrate 6 to a fixed position opposite to the thin battery 2 with a fitting structure. The substrate holder 5 is laminated on the convex electrode surface 2A to insulate the first lead 11 from the convex electrode surface 2A, and is bent away from the bottom plate 5A to bend the first lead 11. The guide 5B is integrally formed of plastic. The substrate holder 5 is provided with a through hole 5C through which the convex electrode 2a is inserted in the bottom plate 5A, and an insertion hole 5D through which the first lead 11 is inserted between the bottom plate 5A and the bending guide 5B. The bending guide 5B is disposed away from the bottom plate 5A. In the battery pack, the first lead 11 having one end connected to the circuit board 6 is the side opposite to the side where the convex electrode 2a is located when viewed from the bending guide 5B, and the bending guide 5B of the substrate holder 5 is provided. on the outside of, and bent along, passed through a insertion hole 5D insulated from protruding electrode surface 2A with the bottom plate 5A, the distal end of the first lead 11, inserted through the bottom plate 5A from the through hole 5C The circuit board 6 and the substrate holder 5 are connected to a fixed position of the thin battery 2 in connection with the convex electrode 2a.

  In the battery pack of the present invention, the bending guide 5B of the first lead 11 can be provided at one end of the substrate holder 5, and the positioning guide 5F of the second lead 12 can be provided at the other end. In this battery pack, the first lead 11 is arranged outside the bending guide 5B, the second lead 12 is arranged outside the positioning guide 5F, and the first lead 11 and the second lead 12 are used as a substrate holder. 5 and the circuit board 6 can be connected to a fixed position.

  In the battery pack of the present invention, the first lead 11 can be bent from the upper surface of the bending guide 5B to the outer surface and further bent from the outer surface to the lower surface.

  In the battery pack of the present invention, the output terminal 8 is fixed to the circuit board 6, and the electrode window 7 for exposing the output terminal 8 to the outside can be provided in the exterior case 1.

The battery pack of the present invention can connect the battery holder 20 and the outer case 1 in a fitting shape to connect the battery core 20 to a fixed position of the outer case 1. The first lead 11 is the protection element 9 .

  The battery pack of the present invention has a feature that it can be mass-produced at low cost by assembling it simply, easily and efficiently by reducing the number of parts used. In the battery pack of the present invention, the circuit board is connected to the thin battery by the first lead and the second lead, and the substrate holder is further disposed between the circuit board and the thin battery. Includes a bottom plate which is laminated on the convex electrode surface and insulates the first lead from the convex electrode surface, and a bent guide for the first lead is integrally formed of plastic, and the convex portion is provided on the bottom plate. A through hole for inserting the electrode is provided, an insertion hole for inserting the first lead is provided between the bottom plate and the bending guide, and the first lead having one end connected to the circuit board is connected to the bending guide. Bend along the outside, pass through the insertion hole, be insulated from the convex electrode surface with the bottom plate, connect the tip to the convex electrode inserted through the bottom plate from the through hole, The board holder is connected to the fixed position of the thin battery. It is from. The battery pack having this structure does not require the use of an insulating plate required for the conventional battery pack, and the first lead can be reliably insulated from the convex electrode surface by the substrate holder and placed at a fixed position.

  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. 13 to 16 accommodates a battery core 20 in which a circuit board 6 is connected to a convex electrode surface 2A of a thin battery 2 via a plastic substrate holder 5 in an outer case 1. Yes. 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. 13, and are the maximum surfaces that are configured by width (W) and length (L) in FIG. 13. . Further, 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 formed by connecting the circuit board to the convex electrode surface of the thin battery through the substrate holder.

  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 for the exterior 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 convex electrode surface 2 </ b> A of the thin battery 2 and the circuit substrate 6. 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 by using the PTC as the protection element 9 together with the first lead 11, but a protection element such as a PTC or a thermal fuse is mounted on the circuit board. Thus, both ends of the circuit board can be connected to a thin battery by a first lead and a second lead made of a lead plate. In the battery pack, the circuit board can be connected to the thin battery by using the protection element as a thermal fuse instead of the PTC and the first lead as the thermal fuse.

  The substrate holder 5 is sandwiched between the circuit substrate 6 and the thin battery 2. The substrate holder 5 connects the circuit board 6 to one surface and connects the other surface to the convex electrode surface 2 </ b> A of the thin battery 2. On the side where the circuit board 6 is connected, the board holder 5 is provided with support walls 5E on both sides, and the circuit board 6 is disposed between the support walls 5E. A side of the substrate holder 5 to which the thin battery 2 is connected is provided with a through hole 5 </ b> C for guiding the convex electrode 2 a of the thin battery 2.

  In the illustrated battery pack, both ends of the circuit board 6 are connected to the positive and negative electrodes of the thin battery 2 via the first lead 11 and the second lead 12, and the circuit board 6 is connected to the thin battery 2. In the illustrated battery pack, the first lead 11 is connected to the convex electrode 2a as the protective element 9, and the second lead 12 is connected to the sealing plate 2b as the lead plate. In the illustrated battery pack, the first lead 11 is the protective element 9, but both the first lead and the second lead can be lead plates.

  The first lead 11 connected to the convex electrode 2a needs to be insulated from the sealing plate 2b. This is because the convex electrode 2a connecting the first lead 11 is an electrode different from the sealing plate 2b. The lithium ion secondary battery of the 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. In the illustrated battery pack, the first lead 11 connected to the convex electrode 2a is used as the protective element 9, so that the protective element 9 of the first lead 11 needs to be insulated from the sealing plate 2b. The protection element 9 of the first lead 11 and the sealing plate 2 b are insulated by the substrate holder 5.

  The substrate holder 5 shown in the sectional view of FIG. 15 and the perspective view of FIG. 16 is disposed on the convex electrode surface 2A of the thin battery 2 as shown in FIG. The substrate holder 5 includes a pair of support walls 5E that connect the circuit board 6, a bottom plate 5A that is connected to the lower edge of the support wall 5E and insulates the first lead 11 from the convex electrode surface 2A, A bending guide 5B for bending the first lead 11 is provided apart from the bottom plate 5A. Furthermore, the substrate holder 5 shown in the drawing includes a positioning guide 5F that is provided at an end portion on the opposite side of the bending guide 5B and guides the second lead 12. The substrate holder 5 is integrally formed of plastic with a whole including a pair of support walls 5E, a bottom plate 5A, a bending guide 5B, and a positioning guide 5F.

  The pair of support walls 5 </ b> E is in a posture perpendicular to the convex electrode surface 2 </ b> A, and its outer surface is positioned on the same surface as the front and back surfaces of the thin battery 2 so as not to protrude from the thin battery 2. . Further, the support wall 5E connects the circuit board 6 to a fixed position with a fitting structure. The fitting structure shown in the figure prevents the longitudinal direction, which is the longitudinal direction of the circuit board 6, and the lateral direction and the perpendicular direction perpendicular thereto. In this specification, the vertical direction means the longitudinal direction, and the horizontal direction means the direction orthogonal to the vertical direction. The lateral displacement of the circuit board 6 is prevented by making the width of the circuit board 6 substantially equal to the inner width of the support wall 5E and inserting the circuit board 6 between the pair of support walls 5E. Deviation in the direction perpendicular to both surfaces of the circuit board 6 is prevented by the mounting portion 5G provided protruding from the inner surface of the support wall 5E. The support wall 5 </ b> E in the drawing is provided with a stepped surface on the inner surface to serve as a mounting portion 5 </ b> G for the circuit board 6. The mounting portion 5G can be supported at a fixed position by providing a protrusion on the inner surface of the support wall 5E and placing the back surface of the circuit board 6 on the mounting portion 5G. The illustrated substrate holder 5 is provided with a mounting portion 5G on the support wall 5E so as to support both ends of the circuit board 6 on both sides. The circuit board 6 has its back surface placed on the mounting portion 5G of the support wall 5E to prevent vertical displacement.

  A shift in the longitudinal direction of the circuit board 6, that is, the vertical direction, is prevented by the standing walls 5 </ b> H that are provided on both end faces of the circuit board 6 in the longitudinal direction and project from the end portions of the mounting portions 5 </ b> E. The substrate holder 5 shown in the figure is located at both ends of both end surfaces in the vertical direction of the circuit board 6, that is, at both ends in the vertical direction of the circuit board 6 and at the four corners of the circuit board 6. Provided. In the illustrated substrate holder 5, the four corners of the circuit board 6 are fitted into four recesses formed by the support wall 5E, the mounting portion 5G, and the standing wall 5H, so that the circuit board 6 is in a fixed position. Deploy. Further, the circuit board 6 is arranged with the first lead 11 connected to one end along the outside of the bending guide 5B, and the second lead 12 connected to the other end outside the positioning guide 5F. Arrange along. For this reason, the substrate holder 5 is sandwiched between the first lead 11 and the second lead 12 to prevent the circuit board 6 from being displaced in the vertical direction.

  The substrate holder 5 of FIGS. 15 and 16 is provided with a bending guide 5B at the right end portion of the support wall 5E in this figure. The bending guide 5B is arranged inside the end edge of the support wall 5E. The bending guide 5B has support walls 5E protruding at both ends. Furthermore, the bending guide 5B shown in the figure is arranged at a position lowered from the upper edge of the support wall 5E. This bending guide 5B arrange | positions the 1st lead | read | reed 11 bent along this between a pair of support walls 5E, and prevents the lateral deviation of the 1st lead | read | reed 11 with the support walls 5E of both sides. The bending guide 5B is a guide for bending the first lead 11 along the bending guide 5B. The bending guide 5B is provided apart from the bottom plate 5A by providing an insertion hole 5D through which the protective element 9 as the first lead 11 is inserted between the bending guide 5B. The insertion hole 5D guides the first lead 11 arranged outside the bending guide 5B from here to the upper surface of the bottom plate 5A, and arranges the first lead 11 on the upper surface of the bottom plate 5A. That is, the first lead 11 is disposed at a position where it is insulated from the convex electrode surface 2A by the bottom plate 5A. In the illustrated battery pack, the first lead 11 is a PTC that is the protection element 9, and therefore the insertion hole 5D is opened to a size that allows the PTC to be inserted.

  The positioning guide 5F is provided at the left end portion of the support wall 5E in FIGS. The positioning guide 5F is also arranged at a position lowered from the upper edge of the support wall 5E. In the positioning guide 5F, the second lead 12 bent along the positioning guide 5F is disposed between the pair of support walls 5E, and the lateral displacement of the second lead 12 is prevented by the support walls 5E on both sides. The positioning guide 5F is a guide that bends the second lead 12 along the positioning guide 5F. The tip of the second lead 12 bent in the vertical direction along the positioning guide 5F is connected to the sealing plate 2b of the thin battery 2. In order to connect the second lead 12 bent vertically along the positioning guide 5F to the sealing plate 2b, the substrate holder 5 is connected between the positioning guide 5F and the end of the convex electrode surface 2A. Space 10 is provided. That is, the substrate holder 5 is formed to be shorter than the entire length in the longitudinal direction of the convex electrode surface 2A.

  The bottom plate 5A is provided with a through hole 5C through which the convex electrode 2a is inserted. The through-hole 5C is opened at a position where the convex electrode 2a is inserted and the substrate holder 5 is disposed at a fixed position on the convex electrode surface 2A. The bottom plate 5A shown in the cross-sectional view of FIG. 15 has a shape that allows the convex electrode 2a to be fitted into the through hole 5C. The bottom plate 5A of FIG. 15 has one of the convex electrodes 2a, the right side of the convex electrode 2a in the drawing along the surface of the sealing plate 2b, and the other of the convex electrodes 2a, the left side of the sealing plate 2b in the drawing. It has a shape along a part and the step portion of the convex electrode 2a. The bottom plate 5A can place the substrate holder 5 in a fixed position by inserting the convex electrode 2a into the through hole 5C.

  The first lead 11, which is a PTC of the protective element 9 having one end connected to the circuit board 6, is bent along the outside of the bending guide 5B, passes through the insertion hole 5D, and protrudes with the bottom plate 5A. The tip is connected to the convex electrode 2a that is insulated from the electrode surface 2A and protrudes from the through hole 5C to the upper surface of the bottom plate 5A. The second lead 12 having one end connected to the circuit board 6 is bent downward along the outside of the positioning guide 5F, and the tip is connected to the sealing plate 2b. The circuit board 6 is connected to the thin battery 2 via the first lead 11 and the second lead 12. The substrate holder 5 is sandwiched between the circuit board 6 and the thin battery 2, and is connected to the fixed positions of the thin battery 2 and the circuit board 6. The first lead 11 and the second lead 12 are 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 battery core 20 described above connects the substrate holder 5 and the circuit substrate 6 to each other in a fixed position with a fitting structure. Further, the convex electrode 2a is inserted into the through hole 5C of the bottom plate 5A, and the substrate holder 5 and the thin battery 2 are connected to a fixed position. Therefore, the battery core 20 described above can connect the circuit board 6, the board holder 5, and the thin battery 2 in a fixed position so that their relative positions are not shifted from each other.

The battery core 20 is assembled in the following steps as shown in FIGS.
(1) As shown in FIG. 17, the substrate holder 5 is set on the convex electrode surface 2 </ b> A of the thin battery 2.
(2) As shown in FIG. 18, the PTC of the protection element 9 as the first lead 11 is connected to the circuit board 6.
(3) As shown in FIG. 19, the PTC of the protective element 9 as the first lead 11 is inserted into the insertion hole 5D.
(4) As shown in FIG. 20, the PTC lead of the protective element 9 which is the tip of the first lead 11 is connected by resistance spot welding to the convex electrode 2a protruding upward from the through hole 5C of the bottom plate 5A. To do. In this state, the PTC of the protection element 9 which is the first lead 11 is disposed on the bottom plate 5A and insulated from the convex electrode surface 2A by the bottom plate 5A.
(5) As indicated by the arrow in FIG. 21, the lead plate of the PTC of the protective element 9 as the first lead 11 is folded along the bending guide 5B, and the circuit board 6 is attached to the board holder 5 as shown in FIG. Set to the fixed position.
(6) As shown in FIG. 23, the second lead 12 connected to the circuit board 6 is connected to the sealing plate 2b by resistance spot welding.

  The battery core 20 described above is housed in the following exterior case 1. However, the battery pack of the present invention does not specify the exterior case as the following structure. The following exterior 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 front and back surfaces of the thin battery 2. Molded and provided. The outer case 1 has a box shape with the surface plate 13 and the frame body 14, and the thin battery 2 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. 13. 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. .

  In the illustrated battery pack, the substrate holder 5 and the circuit board 6 of the battery core 20 are placed in the insertion groove 17, and the battery core 20 is disposed at a fixed position of the outer case 1. 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 sectional views of FIGS. 24 and 25 has 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 cross-sectional view of FIG. 25, 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 surface of the connecting frame 14A of the outer case 1 It consists of a fitting recess 19 provided in the 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 connecting frame 14 </ b> A is a fitting hole provided in the surface plate 13 and the eaves 16.

  The fitting protrusion 18 can insert the battery core 20 into the fitting groove 17 and put it into the fitting recess 19, but the battery core 20 does not come out of the fitting groove 17 in the state where it is put in the fitting recess 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 connecting frame 14A, and the contact pressure acting on the output terminal 8 can be firmly applied by the connecting 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 together 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, contrary to the fitting shape of 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 disassembled perspective view of the battery pack which the present applicant developed previously. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a disassembled perspective view of the battery pack concerning one Example of this invention. It is a perspective view of the battery core of the battery pack concerning one Example of this invention. It is an expanded horizontal sectional view which shows the edge part by the side of the substrate holder of the battery pack concerning one Example of this invention. It is an expansion perspective view of a substrate holder. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. It is a perspective view which shows the assembly process of the battery core of the battery pack shown in FIG. 1 is a vertical longitudinal sectional view of a battery pack according to an embodiment of the present invention. 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 ... Bottom plate
5B ... Bending guide
5C ... through hole
5D ... insertion hole
5E ... Supporting wall
5F… Positioning guide
5G ... Placement part
5H ... Standing wall 6 ... Circuit board 7 ... Electrode window 8 ... Output terminal 9 ... Protection element 10 ... Connection space 11 ... First lead 12 ... Second lead 13 ... Surface plate 14 ... Frame body 14A ... Connection frame 15 ... Opening DESCRIPTION OF SYMBOLS 16 ... Eaves 17 ... Insertion groove 18 ... Insertion convex part 19 ... Insertion recessed part 20 ... Battery core 21 ... Double-sided adhesive tape 31 ... Exterior case 31A ... 1st case
31B ... Second case 32 ... Thin battery 32A ... Convex electrode surface 35 ... Terminal holder 37 ... Insulating plate 38 ... Output terminal 40 ... Battery core 41 ... Exterior case 42 ... Thin battery 42A ... Convex electrode surface
42a ... convex electrode
42b ... Sealing plate 43 ... Lead plate 45 ... Substrate holder 46 ... Circuit board 47 ... Insulating plate 48 ... Output terminal 49 ... Protection element 49A ... Lead
49B ... Lead

Claims (6)

The battery core (20) is formed by connecting the circuit board (6) to the convex electrode surface (2A) of the thin battery (2) whose thickness is smaller than the width through the plastic substrate holder (5). A battery pack containing the battery core (20) in the outer case (1),
The circuit board (6) is connected to the thin battery (2) through the first lead (11) connected to the convex electrode (2a) and the second lead (12) connected to the other electrode. The substrate holder (5) is disposed between the circuit board (6) and the convex electrode surface (2A),
The substrate holder (5) connects the circuit board (6) to a fixed position opposite to the thin battery (2) with a fitting structure, and is laminated on the convex electrode surface (2A) to form the first lead (11). The bottom plate (5A) that insulates the convex electrode surface (2A) and the bending guide (5B) that bends the first lead (11) apart from the bottom plate (5A) are integrated with plastic. The bottom plate (5A) is provided with a through hole (5C) through which the convex electrode (2a) is inserted, and between the bottom plate (5A) and the bending guide (5B) 1 The insertion hole (5D) for inserting the lead (11) is provided, and the bending guide (5B) is arranged away from the bottom plate (5A).
A first holder (11) having one end connected to the circuit board (6) is a side opposite to the side where the convex electrode (2a) is located when viewed from the bending guide (5B). outside the folding guides (5B) of), are bent along, is insulated from the protruding electrode surface with through the insertion hole (5D) at the bottom plate (5A) (2A), the through-hole of the tip (5C) is connected to the convex electrode (2a) inserted through the bottom plate (5A), and the circuit board (6) and the board holder (5) are connected to a fixed position of the thin battery (2). Battery pack.   The substrate holder (5) is provided with a bending guide (5B) for the first lead (11) at one end and a positioning guide (5F) for the second lead (12) at the other end. One lead (11) is arranged outside the bending guide (5B), the second lead (12) is arranged outside the positioning guide (5F), and the first lead (11) and the second lead (12 The battery pack according to claim 1, wherein the substrate holder (5) and the circuit board (6) are connected in a fixed position.   The battery pack according to claim 1, wherein the first lead (11) is bent from the upper surface to the outer surface and from the outer surface to the lower surface of the bending guide (5B).   The output terminal (8) is fixed to the circuit board (6), and an electrode window (7) for exposing the output terminal (8) to the outside is provided in the exterior case (1). The battery pack described in 1.   The battery pack according to claim 1, wherein the substrate holder (5) and the outer case (1) are connected in a fitting shape, and the battery core (20) is connected to a fixed position of the outer case (1).   The battery pack according to claim 1, wherein the first lead (11) is a protective element (9).

Images