JP3851284B2 - battery pack - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery pack incorporating a laminated battery.
[0002]
[Prior art]
A polymer battery is manufactured by laminating an exterior film on both sides of an electrode and hermetically adhering the exterior films on both sides at the periphery of the electrode. The polymer battery having this structure has a feature that it can be made thinner and larger than a battery in which an electrode is inserted into a metal outer can. However, polymer batteries also have drawbacks due to the lack of metal outer cans. Since the strength of the exterior film is weaker than that of a metal can, the surface is easily damaged. In order to solve this problem, a battery pack in which a polymer battery is placed in an outer case has been developed. (See Patent Document 1). The battery pack described in this publication has a polymer battery 21 housed in an upper and lower case 22 as shown in FIG. The upper and lower cases 22 connect the plate 24 to the frame body 23.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 11-111250
[Problems to be solved by the invention]
In the battery pack having the above structure, both surfaces of the polymer battery 21 can be protected by the plates 24, but it is difficult to connect the plates 24 to the frame body 23 so as not to be firmly removed. Since the polymer battery 21 is not a metal case but covers an electrode with an exterior film, the polymer battery 21 has an advantage that the whole can be thinned. However, depending on use conditions, the internal pressure may increase and the exterior film may swell. When the exterior film of the polymer battery 21 swells as shown by the chain line in FIG. 2, there is a problem that the plate 24 comes off inside the frame body 23 and comes off. If the width of the frame is increased in order to avoid this problem, the outer shape of the battery pack becomes larger. Further, even if the width of the frame is widened, if the plate is deformed by the polymer battery that swells and the connection with the frame is released, the frame is deformed and becomes more easily detached from the plate. In particular, the frame body made of plastic is formed to have a narrow width in order to make the outer shape of the battery pack as small as possible. This frame body is difficult to have a sufficient strength, and when it is uncoupled from the plate, it becomes more easily deformed and easily detached from the plate. If the width of the frame is increased in order to avoid this harmful effect, there is a drawback that the outer shape of the battery pack becomes larger. The battery pack is required to be as compact as possible to increase the capacity. Therefore, it is very important to make the portion for accommodating the polymer battery as small as possible. Further, since the battery pack of FIG. 2 is joined by inserting the plate 24 inside the frame 23, it is necessary to make the thickness of the frame 24 thicker than that of the polymer battery. Therefore, there is a drawback that the whole battery pack becomes thick.
[0005]
The present invention has been developed for the purpose of solving such drawbacks. An important object of the present invention is to provide a battery pack that can be securely connected so that the plate is not detached from the frame body even when the laminated battery swells while being thin and thin as a whole.
[0006]
[Means for Solving the Problems]
In the battery pack of the present invention, the laminated battery 1 is accommodated in a case in which the first plate 5 and the second plate 6 are connected. The laminate battery 1 has an electrode sandwiched between the first exterior film 1A and the second exterior film 1B, and the first exterior film 1A and the second exterior film 1B are partly or entirely around the electrode. The wrap part 1a is joined and the electrode is built in, and the external shape is made into the rectangle. The first plate 5 is laminated on the surface side of the first exterior film 1 </ b> A of the laminate battery 1. The second plate 6 is laminated on the surface side of the second exterior film 1B. The frame body portion 4 has a quadrangular shape and is disposed along the outer peripheral edge of the laminated battery 1 to connect the outer peripheral edge portions of the first plate 5 and the second plate 6.
The battery pack according to claim 1 is provided with a bent insert piece 12 with the first plate 5 and the second plate 6 as metal plates, and the peripheral portion thereof is bent in an L shape inward, and a frame body is provided. Locking grooves 11 for inserting the bent insertion pieces 12 of the first plate 5 and the second plate 6 are provided on both surfaces of the portion 4.
Further, the bent insertion piece 12 is provided with a locking convex portion 18, and the locking groove 11 is provided with a locking concave portion 19 that locks the locking convex portion 18 so as not to come out.
The locking projection 18 protrudes inward of the frame body portion 4, and the locking recess 19 is a through hole formed in the inner wall 4 b of the locking groove 11.
The bent insertion pieces 12 of the first plate 5 and the second plate 6 are put into the locking grooves 11 on both surfaces of the frame body portion 4, and the locking projections 18 are guided to the locking recesses 19. The plate 5 and the second plate 6 are connected to the frame body portion 4.
[0007]
In the battery pack according to the second aspect of the present invention, the second plate 6 and the frame portion 4 are integrally formed of plastic, and the first plate 5 is made of a metal plate and inserted into the first plate 5 by bending. A piece 12 is provided, and a locking groove 11 for inserting the bent insertion piece 12 of the first plate 5 is provided on the surface of the frame body portion 4.
Further, the locking groove 11 is provided with a locking projection 18, and the bent insertion piece 12 is provided with a locking recess 19 that locks the locking projection 18 so as not to come out.
The locking projection 18 protrudes inward from the outer wall 4a of the locking groove 11, and the locking recess 19 is a through hole.
The bent insertion piece 12 of the first plate 5 is inserted into the locking groove 11 of the frame body portion 4, the locking projection 18 is guided to the locking recess 19, and the first plate 5 is moved to the frame body portion 4. It is connected.
[0008]
The battery pack provided with the locking projection 18 on the bent insertion piece 12 of the plate, which is a metal plate, cuts the metal plate into a groove shape, bends the cutting piece so as to protrude from the surface, and the locking projection 18. Can be provided. The locking projection 18 bends the cut piece gradually away from the surface of the bending insertion piece 12 in the direction opposite to the insertion direction of the bending insertion piece 12, and smoothly enters the locking groove 11. Can be inserted.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a battery pack for embodying the technical idea of the present invention, and the present invention does not specify the battery pack as follows.
[0010]
Further, in this specification, in order to facilitate understanding of the scope of claims, the numbers corresponding to the members shown in the examples are referred to as “the scope of claims” and “the means for solving the problems”. It is added to the member shown by. However, the members shown in the claims are not limited to the members in the embodiments.
[0011]
The battery pack shown in FIGS. 3 to 12 includes a laminate battery 1, a first plate 5 laminated on the surface side of the first exterior film 1A of the laminate battery 1, and a surface of the second exterior film 1B. A rectangular frame which is disposed along the outer peripheral edge of the laminated battery 1 and connects the outer peripheral edge portions of the first plate 5 and the second plate 6. A body part 4 is provided.
[0012]
Further, in the battery pack shown in the partial cross-sectional views of FIGS. 13 to 15, the terminal substrate 2 that fixes the output terminal 8 is disposed on the lap portion 1 a of the laminated battery 1. In the battery pack of FIGS. 13 and 14, a substrate holder 3 is disposed between the terminal substrate 2 and the lap portion 1a. In the battery pack of FIG. 15, the terminal board 2 is disposed on one surface of the lap portion 1a, and the spacer 13 is disposed on the opposite surface.
[0013]
In the laminated battery 1, an electrode is sandwiched between the first exterior film 1A and the second exterior film 1B, and the entire circumference or a part of the first exterior film 1A and the second exterior film 1B is surrounded by the outer circumference of the electrode. It wraps, this lap part 1a is joined, and the electrode is built in. The illustrated laminate battery 1 is a polymer battery. However, the present invention does not specify a laminated battery as a polymer battery. As the laminated battery, all other batteries obtained by laminating electrodes with an exterior film can be used. The laminated battery 1 shown in the figure has a quadrangular shape and is provided with a wrap portion 1a of an exterior film on both sides and one end thereof, that is, the wrap portion 1a provided on three sides of the quadrangle has a first exterior film 1A and a second exterior film. The exterior film 1B is airtightly bonded by a method such as adhesion or welding. In the illustrated laminate battery 1, one exterior film is folded back at one side of the electrode, a portion covering one surface of the electrode is defined as a first exterior film 1 </ b> A, and a surface covering the other surface of the electrode is formed. The second exterior film 1B is used. Since the laminated battery 1 having this structure folds the exterior film along one side of the electrode, there is no wrap portion 1a on one side and the wrap portion 1a on three sides. Although not shown, the laminated battery may have a structure in which wrap portions are provided on the outer periphery of four sides. This laminate battery is manufactured by stacking two exterior films separated on both sides of an electrode and bonding them with four side wraps around the electrode.
[0014]
In the laminated battery 1 shown in FIGS. 13 and 14, the first exterior film 1A is planar. In order to make the first exterior film 1A into a planar shape, the second exterior film 1B is bent along the periphery of the electrode, and is joined to the first exterior film 1A at the lap portion 1a. As shown in the cross-sectional views of FIGS. 13 and 14, the laminate battery 1 is provided with a substrate holder 3 and a terminal substrate 2 only on one side of the wrap portion 1a, and the wrap portion 1a has the same thickness as the electrode storage portion 1b. it can. However, the battery pack of the present invention can be a laminated battery 1 in which both the first exterior film 1A and the second exterior film 1B are bent along the electrodes as shown in the cross-sectional view of FIG. . In this battery pack, a substrate holder 3 and a terminal substrate 2 are provided on the front surface side of the wrap portion 1a, the output terminal 8 is flush with the electrode housing portion 1b, and a spacer 13 is disposed on the back surface of the wrap portion 1a. The wrap part 1a is reinforced.
[0015]
In the laminated battery 1, the wrap portions 1a located on both sides of the electrode are bent along the side surface of the electrode. 6, 7, 11, and 12, the width of the wrap portion 1 a provided on both sides of the electrode is made narrower than the thickness of the battery, and the step space portion 7 is provided on the surface. As shown in FIG. 7, the frame body portion 4 is integrated with the frame body portion 4 so that the rib 15 extending along the inner periphery of the frame body portion 4 protrudes inward so as to protrude into the step space portion 7. The ribs 15 can also be disposed in the step space portion 7 of the laminated battery 1. As shown in the figure, the laminated battery 1 in which the wrap portions 1a on both sides of the electrode are bent along the electrodes does not project the wrap portions 1a on both sides to both sides, so that the overall width can be reduced. Further, as shown in FIGS. 4 and 9, the bent lap portions 1a on both sides can act as reinforcing ribs that prevent the wrap portion 1a provided with the output terminal 8 from bending, thereby reinforcing this portion. Furthermore, there is also a feature that it can be mounted so that a useless gap is not formed on the inner surface of the frame body portion 4.
[0016]
In the laminated battery 1, positive and negative output leads 9 are provided on a lap portion 1 a where the output terminal 8 is provided. Although not shown, the output lead 9 is airtightly sandwiched between the first exterior film and the second exterior film and pulled out. The output lead 9 is connected to the output terminal 8 of the battery pack via the protective element 10. The laminate battery 1 is inserted into a rectangular frame body 4.
[0017]
The frame part 4 is entirely formed into a rectangular frame shape with plastic. In the battery pack shown in FIGS. 3 to 7, the frame portion 4 is molded from plastic as a separate part from the first plate 5 and the second plate 6. In the battery pack shown in FIGS. 8 to 12, the frame portion 4 and the second plate 6 are integrally formed of plastic.
[0018]
The frame body portion 4 has an inner shape of a size that allows the laminated battery 1 on which the terminal substrate 2 and the substrate holder 3 are mounted to be fitted. Further, the frame 4 has the same or almost the same surface as the surface of the laminated battery 1 to be inserted or a thickness lower than the surface of the laminated battery 1 so that the battery pack is not thickened by providing this. Molded.
[0019]
The rectangular frame 4 has a locking groove 11 on the surface. The frame body portion 4 of FIGS. 5 to 7 is provided with locking grooves 11 on both surfaces, and the first plate 5 and the second plate 6 are connected to both surfaces of the frame body portion 4. 10 to 12, the second plate 6 is integrally formed. Therefore, the locking groove 11 is provided only on one surface, and the first plate 5 is provided in the frame body portion 4. Are connected. The locking groove 11 is formed to have a width and depth to which a bent insertion piece 12 provided at the leading edge of the plate is inserted and connected.
[0020]
The plate inserted and connected to the locking groove 11 of the frame body part 4 is a metal plate. In the battery pack of FIGS. 3 to 7, the first plate 5 and the second plate 6 are connected by being inserted into the locking groove 11 of the frame body portion 4, so that the first plate 5 and the second plate 6 are connected. Is a metal plate. In the battery pack shown in FIGS. 8 to 12, the first plate 5 is inserted into the engaging groove 11 of the frame body portion 4 and connected, and the second plate 6 is integrally formed with the frame body portion 4 with plastic. Therefore, only the first plate 5 is a metal plate. In order to connect the plate which is a metal plate to the locking groove 11, a peripheral portion is bent in an L shape inside to provide a bent insertion piece 12. The bending insertion piece 12 is provided on the entire circumference of the plate or on a portion other than the corner.
[0021]
In order to prevent the bent insertion piece 12 from coming out of the inserted locking groove 11, a locking projection 18 is inserted into one of the plate and the locking groove 11, and the locking projection 18 is inserted into the other. A locking recess 19 is provided for locking so as not to come off. The battery packs of FIGS. 5 and 6, FIG. 10 and FIG. 11 are provided with a locking projection 18 on the bent insertion piece 12 of the plate and a locking recess 19 for inserting the locking projection 18 into the locking groove 11. ing. In the battery pack of FIGS. 7 and 12, a locking projection 18 is provided in the locking groove 11, and a locking recess 19 for receiving the locking projection 18 is provided in the plate. The locking projection 18 and the locking recess 19 are provided at a plurality of locations so that the plate can be firmly connected to the frame body portion 4. Since the plate shown in the figure is provided with the bent insertion pieces 12 on all sides of the rectangle, that is, on the four sides, a plurality of locking projections 18 and locking recesses 19 are provided on these four sides. In an ideal state, the plate can be connected to the frame body part 4 so as not to be firmly removed.
[0022]
As shown in the perspective view of FIG. 16, the locking projection 18 provided on the bent insertion piece 12 of the plate is cut so that the metal plate is cut into a groove shape and the cut piece is projected from the surface. Thus, the cut piece is a locking projection 18. The cutting piece is bent so as to gradually move away from the surface of the bending insertion piece 12 in the direction opposite to the insertion direction of the bending insertion piece 12 and in the direction indicated by the arrow in the figure. The cut piece is elastically deformed and smoothly inserted into the locking groove 11 when the bent insertion piece 12 is inserted into the locking groove 11. Although the cut piece in the figure is bent at an obtuse angle to form the locking projection 18, the cut piece can be bent at an acute angle to form the locking projection 18 as shown in FIG. 17.
[0023]
The locking groove 11 is provided with a locking recess 19 for receiving a locking projection 18 provided on the plate. The frame part 4 shown in the drawing connects the outer wall 4a and the inner wall 4b parallel to each other with a connecting part 4c so that a gap is formed, and a locking groove 11 is formed between the outer wall 4a and the inner wall 4b. The inner wall 4b is provided with a through hole as a locking recess 19 into which the locking projection 18 is inserted. The frame body portion 4 which is provided with a through hole in the inner wall 4b and serves as the locking recess 19 can be thinned and connected so as not to come out of the locking projection 18. However, the locking recess does not necessarily need to be a through hole, and a locking recess can be provided by providing a recess on the inner surface of the inner wall.
[0024]
Furthermore, although the frame part 4 of the figure has provided the latching recessed part 19 in the inner wall 4b, it can also provide a latching recessed part in an outer wall. A battery pack having a structure in which a locking recess is provided on the outer wall is provided with a locking protrusion so as to protrude from the bent insertion piece toward the outer wall so as to be guided by the locking recess on the outer wall.
[0025]
The width of the locking groove 11 is such that the locking projection 18 of the bent insertion piece 12 which is a metal plate is inserted by being elastically deformed. The bent insertion piece 12 inserted into the locking groove 11 having this width is restored to the original shape in which the locking projection 18 is not elastically deformed by an elastic restoring force. The locking projection 18 restored to the original shape is caught by the locking recess 19 and prevents the bent insertion piece 12 from coming out of the locking groove 11.
[0026]
As shown in FIGS. 7 and 12, the battery pack in which the bent insertion piece 12 is provided with the locking concave portion 19 and the locking groove 11 is provided with the locking convex portion 18 is provided with the bent insertion piece 12 as the locking concave portion 19. A through hole is provided, and a locking projection 18 is provided so as to protrude from the inner surface of the locking groove 11. The locking projection 18 is provided integrally with the frame body 4 in the process of molding the frame body 4 with plastic. Since the locking projection 18 protrudes inside the locking groove 11, it is necessary to remove the mold for molding this portion in the protruding direction of the locking projection 18, as indicated by the arrow A in the figure. . 7 and 12 is provided with the locking protrusion 18 on the outer wall 4a, the mold is removed in the direction indicated by the arrow A. In order to remove the mold in the direction indicated by the arrow A, the inner wall 4b can be removed from the mold by using a portion facing the portion provided with the locking projection 18 as a cutout 4d. The frame body portion 4 that protrudes from the inner surface of the outer wall 4 and is provided with the locking projection 18 does not require a cutout portion for removing the mold on the outer wall 4. For this reason, the outer wall 4 can be shape | molded as a continuous wall without an excision part. However, although not shown, the frame body portion can also be provided so that the locking projection protrudes from the inner wall to the inner surface of the locking groove.
[0027]
7 and 12 is formed into a shape that is inclined upward in the insertion direction of the bent insertion piece 12. This latching convex part 18 can insert the bending insertion piece 12 smoothly. Moreover, the latching convex part 18 of a figure has a structure which makes a latching surface with the latching recessed part 19 into a perpendicular | vertical surface, and does not fall out. As shown by a chain line in the figure, the locking surface of the locking projection 18 can be an inclined surface so that the bent insertion piece 12 is not pulled out. The locking surface of the locking projection 18 is inclined so that when the pulling force is applied to the bending insertion piece 12, the bending insertion piece 12 moves in the direction in which the locking projection 18 is provided.
[0028]
The locking groove 11 that protrudes the locking projection 18 from the inner surface has a minimum width narrower than the thickness of the bent insertion piece 12. The minimum width of the locking groove 11 in FIGS. 7 and 12 is the distance between the tip of the locking projection 18 and the inner surface of the inner wall 4b. As for the frame part which has the latching convex part in the inner wall, the minimum width | variety of a latching groove becomes a space | interval of the front-end | tip of a latching convex part, and the inner surface of an outer wall. The width of the locking groove 11 is the distance between the tip of the locking projection 18 and the inner surface of the locking groove 11 facing the locking projection 18. The frame body portion 4 having this structure has a structure in which either or both of the outer wall 4a and the inner wall 4b are elastically deformed when the bending insertion piece 12 is inserted into the locking groove 11, and the bending insertion piece 12 is removed. It can be connected to the locking groove 11 so that there is no. This is because the elastically deformed frame body portion 4 is restored after the bent insertion piece 12 is inserted into the locking groove 11, and the locking projection 18 is held in the locking recess 19.
[0029]
The frame body portion 4 has an electrode cover frame 4A that opens an electrode window 16 that exposes the output terminal 8 to the outside as one side of a rectangle. The electrode cover frame 4A is wider than the other parts and opens the electrode window 16. Further, the electrode cover frame 4A has an L-shaped cross section and houses the terminal substrate 2 and the substrate holder 3 therein. As shown in FIGS. 13 and 14, the battery pack including the frame body portion 4 includes a terminal substrate 2 and a substrate holder 3 between the electrode cover frame 4 </ b> A of the frame body portion 4 and the lap portion 1 a of the laminated battery 1. Is disposed. Since the illustrated battery pack is provided with three output terminals 8, three electrode windows 16 are opened in the electrode cover frame 4A.
[0030]
As shown in FIG. 3, the battery pack for fixing the first plate 5 and the second plate 6 to both surfaces of the frame body portion 4 is formed by removing the electrode cover frame 4A of the frame body portion 4 from the second plate 6. The electrode exposed portion 17 provided with the electrode window 16 fitted into the portion 6 b is protruded from the surface so that the surface of the electrode exposed portion 17 is flush with the surface of the second plate 6. In this battery pack, the second plate 6 is fixed to the frame body portion 4 so that the surfaces of the second plate 6 and the frame body portion 4 can be made flush.
[0031]
In the battery pack in which the frame body portion 4 and the second plate 6 are integrally formed of plastic, as shown in FIG. 8, the electrode window 16 provided in the electrode cover frame 4A of the frame body portion 4 is exposed to the outside. As described above, the frame body portion 4 and the first plate 5 are integrally formed.
[0032]
The first plate 5 is laminated on the first exterior film 1A side of the laminate battery 1 to protect the surface of the laminate battery 1, and the second plate 6 is laminated on the surface of the second exterior film 1B. Thus, the back surface of the laminated battery 1 is protected. The plate that inserts the bent insertion piece 12 into the locking groove 11 and connects it to the frame body portion 4 is a metal plate that can be elastically deformed. The plate made of a metal plate is a SUS304 stainless steel plate having a thickness of 0.1 mm. This plate is thin and extremely tough. However, the plate can be made thinner or thicker. For example, the thickness can be 0.05 to 0.3 mm. The plate can be made of iron, iron alloy, aluminum, aluminum alloy or the like instead of stainless steel.
[0033]
The metal plate is provided with a bent insertion piece 12 at the periphery. The plate which is a metal plate is provided with bending insert pieces 12 on all sides which are quadrangular, that is, four sides. The plate provided with the bent insertion pieces 12 on the four sides of the outer periphery can be connected to the frame body portion 4 so as not to be firmly detached in an ideal state. However, although not shown, the battery pack of the present invention can be provided with bent insertion pieces on two opposing sides of a plate that is a metal plate, and can be connected to the frame portion.
[0034]
Further, in the battery pack of FIG. 3, the second plate 6 is provided with a cut portion 6b that exposes the output terminal 8 to the outside, and the bent insertion pieces 12 are provided on both sides of the cut portion 6b. Since the cut-out portion 6b causes the electrode exposed portion 17 of the frame body portion 4 to be exposed to the outside, the cut-out portion 6b has a shape in which the electrode exposed portion 17 can be fitted. The bent insertion pieces 12 provided on both sides of the cut portion 6 b are connected to the locking grooves 11 provided in the frame body portion 4 to connect the second plate 6 to the frame body portion 4. The second plate 6 is provided with a bent insertion piece 12 on all outer peripheral edges except for the electrode exposed portion 17 of the frame body portion 4, and connects the bent insertion piece 12 to the frame body portion 4. The first plate 5 is provided with a bent insertion piece 12 on the entire circumference of the outer peripheral edge, and connects the bent insertion piece 12 to the frame body portion 4. However, the plate does not necessarily need to be provided with a bent insertion piece on the entire outer peripheral portion. For example, a bent insertion piece may be provided at a portion other than the corner portion and connected to the frame portion.
[0035]
In a previous step of connecting the plate to the frame body portion 4, the terminal substrate 2 and the substrate holder 3 are disposed on the lap portion 1 a of the laminated battery 1. The terminal board 2 is disposed on the lap portion 1a of the laminated battery 1 so that the entire battery pack is not thickened in order to provide the output terminal 8. Since the wrap portion 1a is lower than the electrode storage portion 1b to form a concave portion, the output terminal 8 is disposed using this space effectively. The terminal board 2 is an insulating board, and the output terminal 8 of the battery pack is fixed on the upper surface. The output terminal 8 is exposed to the outside from the electrode window 16 provided in the electrode cover frame 4 </ b> A of the frame body portion 4. The output terminal 8 is elastically pressed against a terminal of an electric device on which the battery pack is mounted. In order to hold the output terminal 8 firmly against the pressing force, the terminal substrate 2 provided with the output terminal 8 is supported by the substrate holder 3, the lap portion 1 a and the first plate 5. Furthermore, in order to make the output terminal 8 approach the same surface as the second exterior film 1B, the substrate holder 3 is disposed on the back surface.
[0036]
In addition to the output terminal 8, the terminal substrate 2 can be mounted with an electronic component that realizes a protective circuit for the laminated battery 1. This electronic component is fixed so as to protrude from the back surface of the terminal board 2. The electronic component on the back surface can be disposed here by providing a recess 3 </ b> C on the upper surface of the substrate holder 3. The protection circuit is a circuit that controls the charge / discharge current to prevent the laminate battery 1 from being overcharged or overdischarged, a circuit that detects the overcurrent and interrupts the current, and the current that is supplied when the laminated battery 1 reaches an abnormally high temperature. A circuit that shuts off. The terminal substrate 2 has a long and narrow shape that can be disposed on the lap portion 1a of the laminated battery 1. The terminal board 2 in the figure is a rectangle that can be fitted into the lap portion 1a.
[0037]
The substrate holder 3 is entirely made of plastic. The substrate holder 3 is disposed between the back surface of the terminal substrate 2 and the lap portion 1a of the laminated battery 1, and brings the output terminal 8 of the terminal substrate 2 close to the same surface as the surface of the second exterior film 1B. The substrate holder 3 shown in FIG. 18 is provided with the peripheral wall 3A and the convex portion 3B, and the substantial thickness is increased so that the output terminal 8 is positioned in the same plane as the second exterior film 1B. The convex portion 3B is provided at the center portion, and the peripheral wall 3A is provided along both ends and one side edge. As shown in FIGS. 4, 9 and 18, the convex portion 3 </ b> B can be provided widely in the central portion, or a plurality of convex portions 3 </ b> B can be provided in the central portion, although not shown. Since the concave portion 3C is formed between the convex portion 3B and the peripheral wall 3A, the illustrated battery pack has the protective element 10 disposed in the concave portion 3C. The protection element 10 is a PTC, a breaker, a fuse, or the like. Furthermore, the terminal board 2 on which the electronic component that realizes the protection circuit is mounted is disposed in the recess 3 </ b> C that can form the electronic component on the upper surface of the substrate holder 3. The substrate holder 3 is formed into an outer shape that can be fitted into the lap portion 1 a of the laminated battery 1. The illustrated substrate holder 3 is formed in a rectangular shape.
[0038]
The above battery pack is manufactured as follows.
(1) The terminal board 2 is connected to the laminated battery 1, and the board holder 3 is disposed between the terminal board 2 and the lap portion 1 a of the laminated battery 1. At this time, the protection element 10 or the like is also connected if necessary.
(2) The laminated battery 1 is disposed inside the frame body portion 4 and a plate is connected to the frame body portion 4. In the battery pack of FIG. 4, a first plate 5 and a second plate 6 are connected to the frame body portion 4. In the battery pack of FIG. 9, the second plate 6 is integrally formed with the frame body portion 4, and thus the first plate 5 is connected to the frame body portion 4.
[0039]
The plate connects the bent insertion piece 12 in the locking groove 11. The bent insertion piece 12 placed in the locking groove 11 is connected to the frame body portion 4 so that the locking projection 18 is guided to the locking recess 19 and does not come off. The battery pack for fixing the plate to the frame body portion 4 as described above can be connected so as not to be detached from the frame body portion 4 without bonding the plate. Further, unlike a conventional battery pack, it is not necessary to attach a label or the like to the surface and connect the plate to the frame body portion 4 with the label. As described above, the battery pack which is not adhered and does not adhere to the label can be connected to the frame body portion 4 so as not to remove the plate while being mass-produced extremely efficiently and inexpensively. However, although the plate can be connected to the frame body part 4 without attaching the label, the label is attached to the surface of the plate fixed to the frame body part 4, and the plate and the frame body part 4 are bonded together. Needless to say, it can also be strongly connected.
[0040]
【The invention's effect】
The thin battery pack of the present invention is characterized in that the case plate can be firmly connected so as not to be detached from the frame portion even when the laminated battery swells while being thin and thin as a whole. That is, the thin battery pack of the present invention is provided with a bent insertion piece on the plate connected to the frame body portion, a locking groove is provided on the frame body portion, and further, any of the bending insertion piece and the locking groove is provided. A locking projection is provided on one side, and a locking recess is provided on the other side so that the locking projection does not come out. A bent insertion piece is inserted into the locking groove, and the locking projection, the locking recess, This is because the plate is connected to the frame body portion so as not to come off.
[0041]
Furthermore, the battery pack of the present invention can be assembled by inserting the bent insertion piece of the plate into the locking groove and connecting the plate and the frame part, so that the assembly process is simplified and mass production is performed efficiently and inexpensively. There is also a feature that can be done.
[Brief description of the drawings]
1 is an exploded perspective view of a conventional thin battery pack. FIG. 2 is a cross-sectional view of the thin battery pack shown in FIG. 1. FIG. 3 is a perspective view of a thin battery pack according to an embodiment of the present invention. Fig. 5 is an exploded perspective view of the thin battery pack shown in Fig. 3. Fig. 5 is a cross-sectional view of the thin battery pack shown in Fig. 3. Fig. 6 is an enlarged cross-sectional view of a side portion of the thin battery pack shown in Fig. 5. FIG. 8 is a perspective view of a thin battery pack according to another embodiment of the present invention. FIG. 9 is an exploded perspective view of the thin battery pack shown in FIG. 10 is a cross-sectional view of the thin battery pack shown in FIG. 8. FIG. 11 is an enlarged cross-sectional view of the side portion of the thin battery pack shown in FIG. 10. FIG. Sectional view [FIG. 13] The center part of the edge part of the thin battery pack shown in FIG. FIG. 14 is an enlarged longitudinal sectional view of both side portions of the end portion of the thin battery pack shown in FIG. 3. FIG. 15 is a view of the central portion of the end portion of the thin battery pack according to another embodiment of the present invention. Enlarged longitudinal sectional view [Fig. 16] Enlarged sectional perspective view showing an example of the locking projection provided on the bending insertion piece. [Fig. 17] Enlarged sectional view showing another example of the locking projection provided on the bending insertion piece. 18 is a cross-sectional view of the end portion of the thin battery pack shown in FIG.
DESCRIPTION OF SYMBOLS 1 ... Laminate battery 1A ... 1st exterior film 1B ... 2nd exterior film 1a ... Lapping part 1b ... Electrode storage part 2 ... Terminal board 3 ... Substrate holder 3A ... Peripheral wall 3B ... Convex part 3C ... Concave part 4 ... Frame body part 4A ... Electrode cover frame 4a ... outer wall 4b ... inner wall 4c ... connecting part 4d ... removed part 5 ... first plate 6 ... second plate 6b ... removed part 7 ... step space part 8 ... output terminal 9 ... output lead 10 ... protective element DESCRIPTION OF SYMBOLS 11 ... Locking groove 12 ... Bending insertion piece 13 ... Spacer 15 ... Rib 16 ... Electrode window 17 ... Electrode exposed part 18 ... Locking convex part 19 ... Locking concave part 21 ... Polymer battery 22 ... Upper and lower case 23 ... Frame Part 24 ... Metal plate

Claims (4)

An electrode is sandwiched between the first exterior film (1A) and the second exterior film (1B), and the first exterior film (1A) and the second exterior film (1B) are part of the outer periphery of the electrode or Laminated battery (1) that wraps around the whole circumference, joins this wrap part (1a), incorporates an electrode inside, and has a rectangular outer shape, and first exterior film (1A) of this laminated battery (1) Along the outer periphery of the laminated battery (1), the first plate (5) laminated on the surface side, the second plate (6) laminated on the surface side of the second exterior film (1B), and the laminated battery (1) Provided with a quadrangular frame portion (4) connecting the outer peripheral edge portions of the first plate (5) and the second plate (6),
The first plate (5) and the second plate (6) are metal plates, and the peripheral edge portion is bent in an L shape inside, and a bent insertion piece (12) is provided.
The rectangular frame (4) is provided with locking grooves (11) on both sides for inserting the bent insertion pieces (12) of the first plate (5) and the second plate (6).
Furthermore, the locking projections on the bent insert (12) to (18), the locking groove locking portion (11) engaging recess (19) for engaging to prevent escape (18) Provided,
The locking projection (18) protrudes inward of the frame body (4) , the locking recess (19) is a through hole formed in the inner wall (4b) of the locking groove (11) ,
Insert the bent insertion pieces (12) of the first plate (5) and the second plate (6) into the locking grooves (11) on both sides of the frame (4), and fix the locking projections (18). The first plate (5) and the second plate (6) are connected to the frame portion (4) by guiding to the locking recess (19), and the first plate (5) and the second plate ( A battery pack in which a laminated battery (1) is housed in a case formed by 6) and a frame part (4). An electrode is sandwiched between the first exterior film (1A) and the second exterior film (1B), and the first exterior film (1A) and the second exterior film (1B) are part of the outer periphery of the electrode or Laminated battery (1) which wraps around the entire circumference, joins this wrap part (1a) and incorporates an electrode inside to make the outer shape square, and first exterior film (1A) of this laminated battery (1) Along the outer periphery of the laminated battery (1), the first plate (5) laminated on the surface side, the second plate (6) laminated on the surface side of the second exterior film (1B), and the laminated battery (1) Provided with a quadrangular frame portion (4) connecting the outer peripheral edge portions of the first plate (5) and the second plate (6),
The second plate (6) and the frame part (4) are integrally formed of plastic, the first plate (5) is a metal plate, and the first plate (5) has a peripheral portion L inward. Folded into a letter shape and provided with a folding insert piece (12)
The rectangular frame part (4) formed integrally with the second plate (6) has a locking groove (11) for inserting the bent insertion piece (12) of the first plate (5). On the surface,
Furthermore, the locking groove (11) has a locking projection ( 18) , and the bent insertion piece (12) has a locking recess (19) that locks the locking projection (18) so as not to come off. Provided,
The locking projection (18) protrudes inward from the outer wall (4a) of the locking groove (11) , and the locking recess (19) is a through hole,
Insert the bent insertion piece (12) of the first plate (5) into the locking groove (11) of the frame body (4), and guide the locking projection (18) to the locking recess (19). The first plate (5) is connected to the frame body (4) and laminated in the case formed by the first plate (5), the second plate (6) and the frame body (4). A battery pack containing the battery (1).   The bent insert piece (12) has a locking projection (18) protruding from the surface, and the bent insert piece (12) cuts the metal plate into a groove shape so that the cut piece protrudes from the surface. The battery pack according to claim 1, wherein the battery pack is bent into a locking projection (18).   The battery pack according to claim 3, wherein the cut piece is bent so as to gradually move away from the surface of the bent insert piece (12) in a direction opposite to the insertion direction of the bent insert piece (12).

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