JP2017010857A - Laminate battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a laminate battery, which covers an electrode body with a laminate film sheath, having a configuration capable of achieving a compact battery if the laminate battery is bent.SOLUTION: A laminate battery (1) includes: a sheet-shaped laminate film sheath (20) having a swell part (1a) to cover an electrode body (10) and a seal part (1b) projecting from the swell part (1a) to the outside; a positive electrode connection terminal (41) and a negative electrode connection terminal (42), juxtaposed with each other, each having one end side connected to the electrode body (10) and another end side extending to one direction from the laminate film sheath (20) to the outside; and a fixation tape (60) for fixing a lateral welding part (1f) of the seal part, extending to the one direction along the electrode body (10), in a state that the lateral welding part (1f) is folded to the thickness direction of the laminate film sheath (20), at a position opposite to the positive electrode connection terminal (41) and the negative electrode connection terminal (42) of the laminate film sheath (20).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminated battery in which an electrode body is covered with a laminated film outer package.

  Conventionally, a laminate type battery in which an electrode body is covered with a laminate film outer package is known. In such a laminated battery, the outer peripheral side of the laminate film exterior body is welded in a state where the electrode body is covered with the laminate film exterior body.

  In the laminated battery as described above, for example, as disclosed in Patent Document 1, the electrode body is housed in a space formed in the laminate film exterior body, and the connection terminal connected to the electrode body includes It is pulled out from the laminate film outer package. Moreover, in the structure currently disclosed by patent document 1, the heat-welded part other than the part from which the said connection terminal is pulled out is folded by the back surface on the opposite side to the said space part. The folded portion is fixed to the laminate film outer package with a double-sided tape. Thereby, size reduction of a battery can be achieved.

  On the other hand, depending on the shape of an electric product using a battery, a battery having a curved shape may be required due to the space for storing the battery. As a battery having such a curved shape, for example, as disclosed in Patent Document 2, a battery in which a long main body has a curved surface having a uniform curvature as a whole is known.

JP 2006-261128 A Japanese Patent Laying-Open No. 2015-15245

  By the way, in the case where a laminate type battery that is miniaturized by folding the welded portion of the laminate film outer package as disclosed in Patent Document 1 is curved in the thickness direction as disclosed in Patent Document 2, the laminate film exterior There is a possibility that the folded portion of the body opens outward from the laminate film exterior body in a plan view of the laminate film exterior body. That is, the folded part of the laminate film outer package is located on the outer peripheral side of the laminate battery. Therefore, when the laminated battery is bent in the thickness direction, the folded portion is deformed such that the tip side thereof opens outward from the laminated film outer package in the plan view.

  In particular, in the case of a small battery that is mounted on a small wearable device, the radius of curvature when curved in the thickness direction is relatively small. Therefore, the folded portion of the laminate film exterior body has a high possibility that the front end side opens outward of the laminate film exterior body in the plan view.

  As described above, when a laminated battery in which the welded portion of the laminate film outer package is folded is bent, if the folded portion is opened to the outside of the laminate film outer package in the plan view, the laminate battery is made compact. Is inhibited.

  An object of the present invention is to obtain a configuration in which a battery can be made compact even when the electrode body is covered with a laminate film outer package and the electrode body is curved in the thickness direction.

  A laminated battery according to an embodiment of the present invention includes an electrode body, and a bulging portion that covers the electrode body, and a bulging portion that covers the electrode body, by welding the outer peripheral side in a state of covering the electrode body. A sheet-like laminate film exterior body in which a protruding welded portion is formed, one end side is connected to the electrode body, and the other end side is provided side by side so as to extend outward from the laminate film exterior body in one direction. In the state where the positive electrode connection terminal and the negative electrode connection terminal, and the side weld portion extending in the one direction along the electrode body among the weld portions, are bent in the thickness direction of the laminate film exterior body, the laminate film exterior A fixing member that is fixed at at least one of the two end portions of the body in the one direction (first configuration).

  As described above, in the welded part formed by welding the outer peripheral side of the laminate film outer package in a state of covering the electrode body, the positive electrode connection terminal and the negative electrode connection terminal extend in the extending direction along the electrode body. By bending the side welded portion extending in one direction in the thickness direction of the laminate film outer package, the size of the laminated battery can be reduced.

  In the case of a laminated battery, generally, both end portions in the one direction have high rigidity against bending. That is, in the laminate type battery, the end provided with the positive electrode connecting terminal and the negative electrode connecting terminal has a high rigidity because the welded portion exists. In addition, the end of the laminate type battery opposite to the end provided with the positive electrode connection terminal and the negative electrode connection terminal has relatively high rigidity. For example, in the case of a configuration in which the electrode body is covered with a single laminate film exterior body, the folded portion of the laminate film exterior body is located at the end opposite to the end where the positive electrode connection terminal and the negative electrode connection terminal are provided. Therefore, the rigidity of the end portion is relatively high. Further, for example, in the case of a configuration in which the electrode body is covered with two laminated film exterior bodies, a welded portion exists at the opposite end portion, and thus the rigidity of the end portion is relatively high.

  Therefore, even if the side welded portion is bent, the side welded portion gradually opens outward in the plan view of the laminate film outer package at both end portions in one direction of the laminated battery. Further, when the laminated battery is curved in the thickness direction so that the central part in the one direction becomes convex when viewed from the side, the side welded bent at the end in the one direction of the laminated battery. The part is easy to open outward in a plan view of the laminate film outer package.

  On the other hand, as in the above-described configuration, in the laminated film exterior body, at least one end portion of the both ends in the one direction, the side welded portion is bent as described above by the fixing member. Fix it. Thereby, even when the laminated battery is bent in the thickness direction, the bent side welded portion can be prevented from opening outward in a plan view of the laminate film outer package.

  Therefore, with the above-described configuration, a laminated battery that can be downsized even when bent is obtained.

  In the first configuration, the laminate film exterior body is disposed with respect to the electrode body so as to form a flat portion on a side opposite to the bulging portion with the electrode body interposed therebetween. The side welded portion is bent so as to overlap the planar portion in a plan view of the laminate film exterior body (second configuration).

  Thereby, since a side weld part can be folded more compactly, a laminated battery can be made into a more compact structure. When the protruding length of the side welded portion with respect to the bulged portion is large, when the side welded portion is bent toward the bulged portion, the side welded portion protrudes in the thickness direction of the laminated battery rather than the bulged portion. there is a possibility. Therefore, the thickness dimension of the laminated battery may be increased. On the other hand, as described above, the thickness of the laminated battery is increased by bending the side welded portion so as to overlap the flat portion formed on the opposite side of the bulging portion across the electrode body. Therefore, it is possible to make the laminated battery compact.

  In the first or second configuration, the fixing member is fixed at both end portions in the one direction of the laminate film exterior body in a state where the side welded portion is bent in the thickness direction of the laminate film exterior body. (Third configuration).

  Thereby, the bent side weld part can be more reliably fixed by the fixing member at both ends in one direction in the laminate film exterior body. Therefore, even when the laminated battery is bent, it is possible to more reliably prevent the bent side welded portion from opening outward from the laminated film exterior body in a plan view of the laminate film exterior body. Therefore, the downsizing of the curved laminated battery can be more reliably realized.

  In the third configuration, each of the positive electrode connection terminal and the negative electrode connection terminal extends in a portion extending outward from the laminate film outer package in a plan view of the laminate film outer package. And a folded portion that is folded back at a position where it overlaps. Among the fixing members, the fixing member that fixes the lateral welded portion at the end portion where the positive electrode connection terminal and the negative electrode connection terminal are provided in the laminate film exterior body is a tape made of an insulating material, Of the positive electrode connection terminal and the negative electrode connection terminal, from the position between the bent portion of one connection terminal and the laminate film exterior body, the bent portion of the other connection terminal of the positive electrode connection terminal and the negative electrode connection terminal (Fourth configuration).

  As described above, the positive electrode connection terminal having a bent portion at a position overlapping the laminate film outer package in a plan view of the laminate film outer package, and the fixing member that is a tape made of an insulating material with respect to the bent portion of the negative electrode connection terminal By arrange | positioning, it can prevent that a short circuit arises between bending parts. That is, according to the above-described configuration, the bent portion of the positive electrode connecting terminal and the bent portion of the negative electrode connecting terminal are positioned on the front side and the back side of the fixing member, respectively, and thus are electrically insulated by the fixing member. Therefore, it is possible to prevent a short circuit from occurring between the bent portion of the positive electrode connecting terminal and the bent portion of the negative electrode connecting terminal.

  By arranging the fixing member as described above, the fixing member is not only used for fixing the side welded portion in the bent state, but also the bent portion of the positive electrode connecting terminal and the bent portion of the negative electrode connecting terminal. It can also be used as an insulating member.

  In addition, as described above, by providing a bent portion in each of the positive electrode connection terminal and the negative electrode connection terminal, vibration was applied to the laminate type battery or device while shortening the length of the positive electrode connection terminal and the negative electrode connection terminal. Even in this case, vibration can be absorbed by the respective bent portions of the positive electrode connection terminal and the negative electrode connection terminal.

  That is, by providing each of the positive electrode connection terminal and the negative electrode connection terminal with a bent portion that is folded so as to be folded at a position overlapping the laminate film outer package in a plan view of the laminate film outer package. The lengths of the positive electrode connecting terminal and the negative electrode connecting terminal protruding from the film outer package can be shortened. Thereby, the connection part of a laminated battery and an apparatus can be made into a compact structure.

  Moreover, by providing the bent portion, even when vibration is applied to the device or the laminated battery, the bent portion can absorb the displacement. Thereby, the vibration resistance in the connection part of a laminated battery and an apparatus can be improved.

  The said 4th structure WHEREIN: The said laminate film exterior body has a connection coating | coated part which covers the connection side with the said electrode body in the said positive electrode connection terminal and the said negative electrode connection terminal. The positive electrode connection terminal and the negative electrode connection terminal are positioned so that the respective bent portions overlap the connection coating portion in a plan view of the laminate film exterior body (fifth configuration).

  As described above, by arranging the bent portions of the positive electrode connecting terminal and the negative electrode connecting terminal on the connection covering portion having a relatively small thickness in the laminated battery, the entire laminated battery can be made compact.

  According to the laminated battery according to one embodiment of the present invention, among the welded portions obtained by welding the outer peripheral side of the laminate film outer package while covering the electrode body, the positive electrode connection terminal and the negative electrode connection terminal are stretched. In a state where the side weld portion extending in the direction (one direction) is bent in the thickness direction of the electrode body, the laminate film exterior body is fixed by a fixing member at at least one end portion of both end portions in the one direction. Thereby, even when the laminate type battery is curved, the size of the laminate type battery can be reduced.

FIG. 1 is a perspective view showing a schematic configuration of a laminated battery according to an embodiment. 2 is a cross-sectional view taken along line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a diagram showing a state in which the insulating tape is peeled off in the laminated battery. FIG. 5 is a diagram illustrating a state at the beginning of winding of the insulating tape. FIG. 6 is a diagram for explaining a method for manufacturing a laminated battery. FIG. 7 is a diagram for explaining a method of manufacturing a laminated battery. FIG. 8 is a diagram for explaining a method of manufacturing a laminated battery. FIG. 9 is a diagram for explaining a method of manufacturing a laminated battery. FIG. 10 is a diagram showing a state where the laminated battery is bent.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals and description thereof will not be repeated.

(overall structure)
FIG. 1 is a view showing an appearance of a laminated battery 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a schematic configuration of the laminated battery 1. This laminated battery 1 is a secondary battery having a rectangular shape in a plan view in which an electrode body 10 that functions as a power generator is covered with a laminate film exterior body 20. The laminated battery 1 is used as a battery of a wearable device, for example.

  As shown in FIGS. 1 and 2, the laminated battery 1 includes an electrode body 10 and a laminate film exterior body 20 that covers the electrode body 10. The laminated battery 1 includes a positive electrode connection terminal 41 and a negative electrode connection terminal 42 (connection terminal) connected to the positive electrode 11 and the negative electrode 12 of the electrode body 10, respectively. Furthermore, the laminated battery 1 is fixed in a state where the insulating tape 50 (fixing member) covering a part of the positive electrode connecting terminal 41 and the negative electrode connecting terminal 42 and the side welded portion 1f of the laminated film exterior body 20 are folded. The fixing tape 60 (fixing member). Note that a non-aqueous electrolyte is also enclosed in the laminated battery 1.

  The laminate film outer package 20 is made of a material in which one surface side of an aluminum metal foil is covered with nylon and the other surface side is covered with polypropylene. That is, the laminate film outer package 20 is made of a material obtained by laminating aluminum with nylon and polypropylene. Thereby, the laminate film exterior body 20 is welded by applying pressure while heating the laminate film exterior bodies 20 in a state where the laminate film exterior bodies 20 are overlapped. The metal foil is not limited to aluminum but may be formed of other metal materials such as stainless steel.

  Moreover, the laminate film exterior body 20 is formed in a substantially rectangular shape. By welding the outer peripheral sides of the laminate film exterior body 20 with the electrode body 10 sandwiched between the pair of laminate film exterior bodies 20, the bulging portion 1a and the seal portion 1b as shown in FIGS. Is formed. That is, the swelled portion 1a is formed by covering the electrode body 10 with the laminate film exterior body 20, and the swelled portion 1a is surrounded by adhering the laminate film exterior body 20 around the swelled portion 1a. A seal portion 1b is formed.

  As shown in FIG. 1, in this embodiment, the electrode body 10 is formed in a rectangular parallelepiped shape. Therefore, the bulging part 1a is formed in a rectangular shape in a plan view of the laminate film exterior body 20 (hereinafter also simply referred to as a plan view). The seal portion 1b is formed around the bulging portion 1a so that the laminated battery 1 has a rectangular shape in plan view.

  In addition, as shown in FIG. 2, the pair of laminated film exterior bodies 20 includes the laminated battery 1 having a flat portion 1 c on one side in the thickness direction of the electrode body 10 and the other side in the thickness direction of the electrode body 10. The outer peripheral sides of the laminate film outer package 20 are welded to each other with the electrode body 10 interposed therebetween so as to have the above-described bulged portion 1a. That is, of the pair of laminate film exterior bodies 20, one laminate film exterior body 20 is arranged along the outer shape of the electrode body 10.

  In the portion of the seal portion 1b located on the end side in the longitudinal direction of the laminate-type battery 1, the positive electrode connection terminal 41 and the negative electrode connection terminal 42 are sandwiched between the pair of laminate film exterior bodies 20, and the laminate film The exterior bodies 20 are fixed by welding. In this way, the portion where the positive electrode connection terminal 41 and the negative electrode connection terminal 42 are fixed by welding the laminate film outer package 20, that is, the connection side of the electrode body 10 in the positive electrode connection terminal 41 and the negative electrode connection terminal 42 is the laminate film. The portion covered with the exterior body 20 is referred to as a tab seal portion 1d (connection covering portion) in the following description.

  The part located in the both ends of the transversal direction of the laminated battery 1 among the seal parts 1b is a side weld part 1f protruding from the bulging part 1a. These lateral welded portions 1 f protrude in a direction intersecting with the longitudinal directions of a positive electrode connection terminal 41 and a negative electrode connection terminal 42 described later, and are connected to the positive electrode connection terminal 41 and the negative electrode connection terminal 42 along the electrode body 10. It extends in the extending direction (one direction).

  Moreover, these side weld parts 1f are each bent to the center side of the laminate film outer package 20 so as to overlap the flat part 1c of the laminated battery 1 in plan view. That is, the side welded portion 1f of the seal portion 1b has a folded portion extending in the longitudinal direction of the laminated battery 1 (the extending direction of the positive electrode connecting terminal 41 and the negative electrode connecting terminal 42) so as to overlap the flat portion 1c in plan view. 1e is formed.

  Thus, the laminated battery 1 can be reduced in size by forming the folding | returning part 1e in the side welding part 1f of the seal | sticker part 1b, respectively. In addition, by forming the folded portion 1e so as to overlap the flat portion 1c of the laminate-type battery 1, the laminate-type battery 1 can be surely made compact in the thickness direction.

  When the side welded portion 1f of the seal portion 1b is bent toward the bulged portion 1a, the side welded portion 1f may be the laminated battery 1 depending on the protruding length of the side welded portion 1f with respect to the bulged portion 1a. May protrude in the thickness direction. On the other hand, as described above, the side-welded portion 1f is folded so as to overlap the flat portion 1c of the laminated battery 1 in plan view to form the folded portion 1e, whereby the laminated battery 1 is seen in plan view. While having a compact configuration in the short direction, a compact configuration can also be achieved in the thickness direction.

  In this embodiment, the outer peripheral sides of the pair of laminate film exterior bodies 20 are welded to each other. However, the present invention is not limited to this, and one laminate film exterior body is folded and welded so as to sandwich the electrode body 10 therebetween. May be. The direction in which the laminate film exterior body is folded back may be the extending direction of the positive electrode connection terminal 41 and the negative electrode connection terminal 42 with respect to the electrode body 10 or may be the width direction.

  As shown in FIG. 2, the electrode body 10 is a laminated body formed by superposing a positive electrode 11 and a negative electrode 12 each formed in a sheet shape so that a sheet-like separator 13 is positioned between them. is there. In the present embodiment, the electrode body 10 is a laminated body in which the sheet-like positive electrode 11, the negative electrode 12 and the separator 13 are laminated. However, the present invention is not limited to this, and the positive electrode 11, the negative electrode 12 and the separator 13 are laminated. The wound body may be formed in a flat shape by being crushed after being wound in a state.

  In FIG. 2, as an example of the electrode body 10, a laminated body in which the positive electrode 11 and the negative electrode 12 are laminated in a total of five layers is illustrated, but the electrode body 10 is not limited to this, and the electrode body 10 is a laminated body of four layers or less. It may be a body or a laminate of 6 or more layers.

In the positive electrode 11, a positive electrode active material layer containing a positive electrode active material is provided on both surfaces or one surface of a positive electrode current collector made of a metal foil such as aluminum. Specifically, the positive electrode 11 is formed by applying a positive electrode mixture containing a positive electrode active material that is a lithium-containing oxide capable of occluding and releasing lithium ions, a conductive additive, and a binder onto a positive electrode current collector made of aluminum foil or the like. And then dried. As the lithium-containing oxide as the positive electrode active material, for example, a lithium composite oxide such as lithium cobalt oxide such as LiCoO ₂ , lithium manganese oxide such as LiMn ₂ O ₄ , lithium nickel oxide such as LiNiO ₂ is used. Is preferred. Note that only one type of material may be used as the positive electrode active material, or two or more types of materials may be used. Further, the positive electrode active material is not limited to the above-described materials.

  In the negative electrode 12, negative electrode active material layers containing a negative electrode active material are provided on both sides of a negative electrode current collector made of a metal foil such as copper. Specifically, the negative electrode 12 is formed by applying and drying a negative electrode mixture containing a negative electrode active material capable of occluding and releasing lithium ions, a conductive additive and a binder on a negative electrode current collector made of copper foil or the like. It is formed. As the negative electrode active material, for example, it is preferable to use a carbon material (such as graphite, pyrolytic carbon, coke, or glassy carbon) that can occlude and release lithium ions. The negative electrode active material is not limited to the above-described materials.

  The positive electrode 11 of the electrode body 10 is connected to a positive electrode connection terminal 41 in a current collector exposed region (not shown) where a positive electrode active material layer is not formed and the positive electrode current collector is exposed. On the other hand, the negative electrode 12 has a negative electrode connection terminal 42 connected to a current collector exposed region (not shown) where the negative electrode active material layer is not formed and the negative electrode current collector is exposed. A part of each of the positive electrode connection terminal 41 and the negative electrode connection terminal 42 is located outside the laminate film outer package 20. Thereby, an impedance can be made small compared with the structure which draws out a connection terminal outside through other connection components.

  In the positive electrode connection terminal 41, a nickel metal foil 41b (second connection terminal) formed in a rectangular shape in plan view is welded to an aluminum metal foil 41a (first connection terminal) formed in a rectangular shape in plan view. It is configured by In the case of the aluminum metal foil 41a, it is difficult to weld the aluminum foil 41a so as to have a necessary strength with respect to the terminal of the device. Therefore, as described above, the nickel metal foil 41b is welded to the aluminum metal foil 41a, and the nickel metal foil 41b is connected to the terminal of the device by welding, whereby the positive electrode connection terminal 41 and the device terminal are connected. The connection strength can be ensured.

  Specifically, as shown in FIG. 2, the positive electrode connection terminal 41 has one end in the longitudinal direction in the aluminum metal foil 41a connected to the positive electrode 11, and the other end in the longitudinal direction in the aluminum metal foil 41a. The portion extends outward from the laminate film outer package 20. That is, in the positive electrode connection terminal 41, an aluminum metal foil 41 a is sandwiched between the laminate film exterior bodies 20 in the thickness direction.

  A portion of the aluminum metal foil 41a that extends outward from the laminate film exterior body 20 is bent so as to overlap the tab seal portion 1d of the laminate film exterior body 20 in plan view. The nickel metal foil 41b is connected by welding so that the end in the longitudinal direction is folded back to the aluminum metal foil 41a located in a portion overlapping the tab seal portion 1d in plan view.

  That is, the positive electrode connection terminal 41 is a first bent in which the positive electrode connection terminal 41 is bent toward the inside of the laminate film exterior body 20 in a plan view at a portion extending outward from the laminate film exterior body 20. It has a portion 41c. In addition, the positive electrode connection terminal 41 is a second bent portion that is folded back so that the front end side of the positive electrode connection terminal 41 extends toward the outside of the laminate film exterior body 20 at a position overlapping the laminate film exterior body 20 in plan view. 41d.

  In the present embodiment, the second bent portion 41d has a nickel metal foil 41b in the positive electrode connection terminal 41 with respect to an aluminum metal foil 41a extending inward of the laminate film outer package 20 in plan view. This is realized by welding the two metal foils 41a and 41b in a state of being arranged so as to extend outward of the laminate film outer package 20 in plan view. However, the second bent portion 41b may be formed by bending either the aluminum metal foil 41a or the nickel metal foil 41b.

  In this way, the positive electrode connection terminal 41 includes the first bent portion 41c and the second bent portion 41d, so that as shown in FIG. It is formed in a letter shape.

  As described above, the positive electrode connection terminal 41 serves as a bent portion so as to be folded at a position overlapping with the laminate film exterior body 20 in a plan view on a part of the portion extending outward from the laminate film exterior body 20. By providing the second bent portion 41d, the length of the positive electrode connection terminal 41 can be shortened, and the connection portion between the laminated battery 1 and the device can be made compact. That is, since the positive electrode connection terminal 41 is welded with the aluminum metal foil 41a and the nickel metal foil 41b, the welded portion increases the length of the connection portion between the laminated battery 1 and the device. On the other hand, the above-described welded portion is a bent portion, and the bent portion is disposed so as to overlap the tab seal portion 1d of the laminate film outer package 20 in a plan view, whereby the laminated battery 1 and the device are arranged. The connecting portion can be configured to be short and compact.

  The negative electrode connection terminal 42 is made of a metal foil such as copper extending in one direction. As shown in FIG. 3, one end of the negative electrode connection terminal 42 is connected to the negative electrode 12 (not shown), and the other end extends to the outside of the laminate film outer package 20. That is, the negative electrode connection terminal 42 is also sandwiched by the laminate film outer package 20 similarly to the positive electrode connection terminal 41.

  Similarly to the positive electrode connection terminal 41, the negative electrode connection terminal 42 is formed at a portion extending outward of the laminate film outer package 20 toward the inner side of the laminate film outer package 20 in a plan view. Has a first bent portion 42a. In addition, the negative electrode connection terminal 42 is bent so that the front end side of the negative electrode connection terminal 42 extends outward from the laminate film exterior body 20 at a position overlapping the laminate film exterior body 20 in plan view. It has the 2nd bending part 42b.

  In this way, the negative electrode connection terminal 42 has the first bent portion 42a and the second bent portion 42b, so that the negative electrode connection terminal 42 can be seen in the longitudinal section as shown in FIG. It is bent in a letter shape.

  FIG. 4 shows a state where the insulating tape 50 is peeled off in the laminated battery 1. As shown in FIG. 4, not only the positive electrode connection terminal 41 but also the negative electrode connection terminal 42 is formed on a part of a portion extending outward from the laminate film outer package 20 in a plan view and the laminate film outer package 20. It has the 2nd bending part 42b as a bending part bent so that it might be folded in the overlapping position. Therefore, the positive electrode connecting terminal 41 and the negative electrode connecting terminal 42 can be arranged in a compact manner, and the connecting portion between the laminated battery 1 and the device can be made short and compact.

  Moreover, by providing the positive electrode connection terminal 41 and the negative electrode connection terminal 42 with the second bent portions 41d and 42b as described above, the second bent portion 41d, The vibration can be absorbed by 42b. Therefore, it is possible to prevent the positive electrode connection terminal 41 and the negative electrode connection terminal 42 from being damaged by the vibration applied to the laminated battery 1 or the device.

  The positive electrode connection terminal 41 and the negative electrode connection terminal 42 have the same length from the base end portion of the portion extending outward from the laminate film outer package 20 to the second bent portions 41d and 42b, respectively. Thereby, the positive electrode connection terminal 41 and the negative electrode connection terminal 42 can be made a compact structure to the same extent. Therefore, the entire laminated battery 1 can be made compact. Further, when vibration is applied to the laminated battery 1 or the device, the positive electrode connection terminal 41 and the negative electrode connection terminal 42 have the same deformation characteristics at the second bent portions 41d and 42b. Therefore, the positive electrode connection end 41 and the negative electrode connection terminal 42 have equivalent vibration resistance.

  2 and 3, on the surfaces of the positive electrode connection terminal 41 and the negative electrode connection terminal 42, the positive electrode side resin portion 45 and the negative electrode side resin portion are respectively sandwiched by the laminate film outer package 20. 46 (resin member) is formed. That is, the positive electrode side resin portion 45 is positioned between the laminate film outer package 20 and the positive electrode connection terminal 41, and the negative electrode side resin portion 46 is positioned between the laminate film outer package 20 and the negative electrode connection terminal 42.

  Accordingly, the adhesive strength between the laminate film exterior body 20 and the positive electrode connection terminal 41 and the negative electrode connection terminal 42 sandwiched between the laminate film exterior body 20 can be improved, and the positive electrode connection terminal 41 and the negative electrode connection can be improved. The terminal 42 and the laminate film exterior body 20 can be more reliably electrically insulated.

  The positive electrode side resin part 45 and the negative electrode side resin part 46 are each configured by a rectangular sheet in plan view made of a resin material such as polypropylene (PP). With this sheet extending in a direction orthogonal to the positive electrode connection terminal 41 and the negative electrode connection terminal 42 and arranged so as to sandwich the positive electrode connection terminal 41 and the negative electrode connection terminal 42, respectively, the positive electrode connection terminal 41 and the negative electrode connection terminal The positive electrode side resin part 45 and the negative electrode side resin part 46 are respectively formed by being deposited on each surface of 42.

  In the present embodiment, as shown in FIGS. 1 to 4, the positive electrode side resin portion 45 and the negative electrode side resin portion 46 provided as described above are also bent together with the positive electrode connection terminal 41 and the negative electrode connection terminal 42, respectively. Yes. Thereby, the laminated battery 1 can be made into a more compact configuration.

  As shown in FIG. 1, a fixing tape 60 is wound around the end of the laminate film exterior body 20 in the longitudinal direction opposite to the positive electrode connection terminal 45 and the negative electrode connection terminal 46. The fixing tape 60 is wound on the laminate film exterior body 20 so as to be fixed in a state where the side weld portion 1f of the laminate film exterior body 20 is folded on the flat surface portion 1c. The fixing tape 60 is made of, for example, a polyester film.

  As shown in FIGS. 1 to 3, an insulating tape 50 is wound around the tab seal portion 1 d of the laminated battery 1 so as to cover the second bent portions 41 d and 42 b of the positive electrode connection terminal 41 and the negative electrode connection terminal 42. ing. The insulating tape 50 is wound in the short direction of the laminated battery 1 so that the second bent portions 41d and 42b of the positive electrode connecting terminal 41 and the negative electrode connecting terminal 42 are fixed to the tab seal portion 1d.

  The insulating tape 50 is made of, for example, a polyester film, like the fixing tape 60, and has a tape width equivalent to that of the fixing tape 60. The insulating tape 50 and the fixing tape 60 have a tape width equivalent to the length of the laminated battery 1 in the tab seal portion 1d in the longitudinal direction. In the present embodiment, the insulating tape 50 and the fixing tape 60 are the same type and size. Thereby, the manufacturing cost of the laminated battery 1 can be reduced. Note that different types of tape may be used as the insulating tape 50 and the fixing tape 60, respectively.

  FIG. 5 shows a winding start portion of the insulating tape 50 around the tab seal portion 1d. As shown in FIG. 5, in the insulating tape 50, the winding start portion with respect to the tab seal portion 1 d is located between the second bent portion 41 d of the positive electrode connection terminal 41 and the laminate film exterior body 20. On the other hand, the insulating tape 50 is disposed so as to cover the negative electrode connection terminal 42. Thereby, the second bent portion 41d of the positive electrode connection terminal 41 is positioned on the front side (the upper surface side in FIG. 5) of the insulating tape, while the second bent portion 42b of the negative electrode connection terminal 42 is on the back side of the insulating tape 50 (see FIG. 5 on the lower surface side). Therefore, the second bent portion 41d of the positive electrode connecting terminal 41 and the second bent portion 42b of the negative electrode connecting terminal 42 are electrically insulated by the insulating tape 50 on the tab seal portion 1d.

  In the case of the configuration in which the second bent portions 41d and 42b are provided in the positive electrode connection terminal 41 and the negative electrode connection terminal 42 by folding the positive electrode connection terminal 41 and the negative electrode connection terminal 42 on the tab seal portion 1d as in the present embodiment, Depending on the dimensional accuracy of the second bent portions 41d and 42b, the distance between the positive electrode connection terminal 41 and the negative electrode connection terminal 42 may be short, and a short circuit may occur. On the other hand, by disposing the insulating tape 50 with respect to the positive electrode connecting terminal 41 and the negative electrode connecting terminal 42 as described above, the positive electrode connecting terminal 41 and the negative electrode connecting terminal 42 are electrically insulated by the insulating tape 50. can do. Therefore, it is possible to prevent the positive electrode connection terminal 41 and the negative electrode connection terminal 42 from being short-circuited at the second bent portions 41d and 42b.

  The insulating tape 50 is wound around the tab seal portion 1d as shown in FIG. 5 and then covers the second bent portion 41d of the positive electrode connecting terminal 41 and the second bent portion 42b of the negative electrode connecting terminal 42. Again, it is wound around the tab seal portion 1d so as to cover it. Thereby, it can prevent that the 2nd bending part 41d of the positive electrode connection terminal 41 is exposed. Therefore, it can prevent that the 2nd bending part 41d of the positive electrode connection terminal 41 receives damage, or contacts with the component of an apparatus and produces a short circuit.

(Laminated battery manufacturing method)
Next, a method for manufacturing the laminated battery 1 having the above-described configuration will be described with reference to FIGS. FIG. 6 shows a state in which the outer peripheral side of the laminate film exterior body 20 is welded in a state where the electrode body 10 is covered with the laminate film exterior body 20 and the positive electrode connection terminal 41 and the negative electrode connection terminal 42 are sandwiched between the laminate film exterior bodies 20. FIG. FIG. 7 is a view showing a state in which the negative electrode connection terminal 42 is bent so as to overlap the tab seal portion 1d in plan view, and the side weld portion 1f of the seal portion 1b is folded and fixed by the fixing tape 60. FIG. 8 is a diagram illustrating a state where the negative electrode connection terminal 42 is fixed to the tab seal portion 1d by the insulating tape 50. FIG. 9 is a diagram showing a state in which the aluminum metal foil 41a of the positive electrode connection terminal 41 is folded and the nickel metal foil 41b is connected to the metal foil 41a by welding.

  First, the electrode body 10 is formed by superimposing the positive electrode 11, the negative electrode 12, and the separator 13 each formed in a sheet shape. Further, the positive electrode side resin portion 45 and the negative electrode side resin portion 46 are formed by bonding resin sheets to both surfaces of the aluminum metal foil 41 a of the positive electrode connection terminal 41 and the negative electrode connection terminal 42. The aluminum metal foil 41a and the negative electrode connecting terminal 42 of the positive electrode connecting terminal 41 in which the positive electrode side resin portion 45 and the negative electrode side resin portion 46 are thus formed are connected to the positive electrode 11 and the negative electrode 12, respectively. In addition, since these processes are the same as the manufacturing method of the conventional laminate type battery, illustration is abbreviate | omitted.

  Furthermore, in a state where the electrode body 10 is disposed on the laminate film exterior body 20, another laminate film exterior body 20 is overlapped, and the two laminate film exterior bodies 20 are welded around the electrode body 10. Thereby, as shown in FIG. 6, the seal portion 1 b is formed so as to surround the electrode body 10. In the seal portion 1b, the portion where the positive electrode connection terminal 41 and the negative electrode connection terminal 42 cover the portion extending from the electrode body 10 (tab seal portion 1d) has a wider welding range of the laminate film exterior body 20 than the other portions. .

  As described above, when the electrode body 10 is covered with the two laminate film exterior bodies 20, the two laminate film exterior bodies 20 are arranged so as to form the plane portion 1c by the one laminate film exterior body 20. 10 is arranged. That is, of the two laminate film exterior bodies 20, one laminate film exterior body 20 constitutes the flat portion 1c, and the other laminate film exterior body 20 constitutes the bulging portion 1a.

  Next, as shown in FIG. 7, the first bent portion 42 a is formed by bending a portion of the negative electrode connection terminal 42 extending from the laminate film outer package 20 so as to overlap the tab seal portion 1 d in a plan view. . Furthermore, the second bent portion 42b is formed by bending the tip end side of the first bent portion 42a of the negative electrode connecting terminal 42 so that the negative electrode connecting terminal 42 extends outward of the laminate film exterior body 20 in a plan view. Form. As a result, the negative electrode connection terminal 42 is folded in a part of the portion extending outward from the laminate film exterior body 20 so as to be folded back at a position overlapping the laminate film exterior body 20 in plan view. It has a curved portion 42b.

  When the negative electrode connection terminal 42 is bent as described above, the negative electrode side resin portion 46 is also bent.

  In addition, as shown in FIG. 7, in the seal portion 1b, the side weld portions 1f located at both ends in the short direction of the laminate film exterior body 20 are folded so as to overlap the flat portion 1c. The fixing tape 60 is used for fixing. That is, the side weld portion 1 f of the seal portion 1 b is bent toward the center side in the short direction of the laminate film exterior body 20 in plan view. Thereby, the folding | returning part 1e is formed in the both ends of the transversal direction of the laminate film exterior body 20. FIG.

  The fixing tape 60 is wound around the end portion in the longitudinal direction on the opposite side of the positive electrode connection terminal 41 and the negative electrode connection terminal 42 in the laminate film outer package 20. That is, the side weld portion 1f of the seal portion 1b is folded in the center in the short direction of the laminate film exterior body 20 so as to overlap the planar portion 1c in plan view. It is fixed by a fixing tape 60 at the end in the longitudinal direction opposite to the positive electrode connection terminal 41 and the negative electrode connection terminal 42.

  Next, as shown in FIG. 8, the insulating tape 50 is affixed on the tab seal part 1d so that the 2nd bending part 42b of the negative electrode connection terminal 42 may be covered. The insulating tape 50 is affixed to the tab seal portion 1d so as to extend in the short direction of the laminate film outer package 20. At this time, the insulating tape 50 has the second bent portion 42b of the negative electrode connection terminal 42 from the position positioned when the aluminum metal foil 41a of the positive electrode connection terminal 41 is folded back on the tab seal portion 1d as described later. Covering and affixing to the position which fixes the folding | returning part 1e located in the both ends of the transversal direction of the laminate film exterior body 20, respectively.

  Accordingly, the negative electrode connection terminal 42 is fixed on the tab seal portion 1d by the insulating tape 50, and the folded portion 1e is also fixed to the flat portion 1c.

  Thereafter, as shown in FIG. 9, the aluminum metal foil 41 a of the positive electrode connection terminal 41 is folded back on the tab seal portion 1 d and the insulating tape 50. Specifically, the aluminum metal foil 41a is bent toward the inner side of the laminate film outer package 20 so as to overlap the tab seal portion 1d in plan view. Thereby, the 1st bending part 41c is formed in the metal foil 41a of aluminum. At this time, the positive electrode side resin portion 45 is also bent together with the aluminum metal foil 41a.

  On the aluminum foil 41a folded back as described above, it extends toward the side opposite to the bending direction of the metal foil 41a, that is, toward the outer side of the laminate film outer package 20 in plan view. In addition, the metal foils 41a and 41b are welded to each other with the nickel metal foil 41b disposed thereon. Thus, the nickel metal foil 41b is arranged so that its longitudinal direction coincides with the longitudinal direction of the aluminum metal foil 41a.

  After the nickel metal foil 41b is welded to the aluminum metal foil 41a to obtain the positive electrode connecting terminal 41, the insulating tape 50 is pasted on the positive electrode connecting terminal 41 and again on the negative electrode connecting terminal 42. . Thereby, the laminated battery 1 as shown in FIG. 1 is obtained.

  Note that the insulating tape 50 may not be attached again on the negative electrode connection terminal 42. As long as the positive electrode connection terminal 41 can be fixed to the laminate film outer package 20, the method of applying the insulating tape 50 may be any method.

  As shown in FIG. 10, the laminated battery 1 is formed so as to be curved in accordance with the shape of the equipment to be accommodated. The folded portions 1 e formed at both ends in the short direction of the laminate film exterior body 20 are fixed by a fixing tape 60 and an insulating tape 50. Therefore, when the laminated battery 1 is bent, the folded portion 1e can be prevented from opening outward in plan view.

(Effect of embodiment)
In the present embodiment, of the seal portion 1 b of the laminate film exterior body 20, the side weld portions 1 f located at both ends in the short direction of the laminate film exterior body 20 are placed on the flat portion 1 c of the laminate battery 1. A bent portion 1e is formed by bending the layers so as to overlap each other. Thereby, the laminate type battery 1 can be configured to be compact in the thickness direction while having a compact configuration in the lateral direction in plan view.

  And it fixes with the tape 60 for fixing at the edge part of the longitudinal direction on the opposite side to the positive electrode connection terminal 41 and the negative electrode connection terminal 42 in the laminate film exterior body 20 in the state which bent the side weld part 1f as mentioned above. By doing so, it is possible to prevent the bent portion 1e from opening outward in a plan view when the laminated battery 1 is bent. Thereby, the laminated battery 1 which can implement | achieve size reduction even when curved is obtained.

  Furthermore, in the present embodiment, the side welded portion 1f is bent as described above, and the insulating tape 50 is attached to the laminate film exterior body 20 at the longitudinal ends on the positive electrode connection terminal 41 and negative electrode connection terminal 42 side. The lateral weld portion 1f is fixed to the flat portion 1c. Thereby, the side welding part 1f is fixed in the both ends of the longitudinal direction of the laminated battery 1 in the bent state. Therefore, when the laminated battery 1 is curved, the bent portion 1e can be more reliably prevented from opening outward in plan view.

  Moreover, the insulating tape 50 is disposed so as to electrically insulate the positive electrode connection terminal 41 and the negative electrode connection terminal 42.

  That is, in the present embodiment, each of the positive electrode connection terminal 41 and the negative electrode connection terminal 42 overlaps the laminate film exterior body 20 in a plan view on a part of a portion extending outward from the laminate film exterior body 20. The second bent portions 41d and 42b are formed so as to be folded. Then, the insulating tape 50 is connected to the second bent portion 41d of the positive electrode connection terminal 41 and the second of the negative electrode connection terminal 42 so that the positive electrode connection terminal 41 and the negative electrode connection terminal 42 are positioned on the front side and the back side of the insulation tape 50, respectively. It sticks with respect to the 2nd bending part 42b.

  Accordingly, since the insulating tape 50 is located between the second bent portion 41d of the positive electrode connecting terminal 41 and the second bent portion 42b of the negative electrode connecting terminal 42, the positive electrode connecting terminal 41 and the negative electrode connecting terminal 42 are electrically connected. Can be electrically insulated.

  Further, as described above, by providing the second bent portions 41d and 42b in the positive electrode connection terminal 41 and the negative electrode connection terminal 42, respectively, the connection portion between the laminated battery 1 and the device can be made compact. . In addition, by providing the second bent portions 41d and 42b, the displacement of the positive electrode connecting terminal 41 and the negative electrode connecting terminal 42 can be absorbed by the second bent portions 41d and 42b. Thereby, the vibration applied to the laminate-type battery 1 or the apparatus can be absorbed by the second bent portions 41d and 42b.

  Moreover, in the tab seal portion 1d, the positive electrode side resin portion 45 and the negative electrode side resin portion 46 disposed between the positive electrode connection terminal 41 and the negative electrode connection terminal 42 and the laminate film outer package 20 are also made of aluminum of the positive electrode connection terminal 41. The metal foil 41a and the negative electrode connection terminal 42 are bent together. Thereby, the laminated battery 1 can be made into a more compact configuration.

  In the present embodiment, the insulating tape 50 is disposed so as to extend from between the second bent portion 41d of the positive electrode connecting terminal 41 and the tab seal portion 1d to a position covering the second bent portion 42b of the negative electrode connecting terminal 42. The Thereby, the positive electrode connection terminal 41 and the negative electrode connection terminal 42 can be insulated by the insulating tape 50 with a simple configuration. Therefore, the laminated battery 1 in which the positive electrode connection terminal 41 and the negative electrode connection terminal 42 are electrically insulated can be easily manufactured.

(Other embodiments)
Although the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented without departing from the spirit of the invention.

  In the said embodiment, the fixing tape 60 and the insulating tape 50 for fixing the side weld part 1f of the seal part 1b of the laminated battery 1 in the folded state at both ends in the longitudinal direction of the laminate film outer package 20 are provided. It is rolled up. However, the fixing tape 60 may be wound only on the end in the longitudinal direction opposite to the positive electrode connection terminal 41 and the negative electrode connection terminal 42 in the laminate film exterior body 20, or the longitudinal direction of the laminate film exterior body 20. The fixing tape may be wound around three or more locations.

  In the said embodiment, although the insulating tape 50 and the fixing tape 60 are comprised by the polyester film, it is not restricted to this, You may be comprised by materials other than a polyester film.

  In the said embodiment, the side welding part 1f of the seal part 1b of the laminated battery 1 is bent so that it may overlap on the plane part 1c. However, the side welded portion 1 f may be bent toward the bulging portion 1 a side of the laminated battery 1. That is, the side welded portion 1 f only needs to be bent in the thickness direction of the laminate film outer package 20.

  In the embodiment, the positive electrode connection terminal 41 and the negative electrode connection terminal 42 have the first bent portions 41c and 42a and the second bent portions 41d and 42b, respectively. May have a part. That is, the positive electrode connection terminal 41 and the negative electrode connection terminal 42 may have any configuration as long as the positive electrode connection terminal 41 and the negative electrode connection terminal 42 have a bent portion that is folded back toward the outside of the laminate film exterior body 20. .

  In the above-described embodiment, the positive electrode connection terminal 41 is joined by welding the aluminum metal foil 41a and the nickel metal foil 41b, but may be joined by other means. Moreover, the positive electrode connection terminal 41 may be comprised with integral metal foil. When the positive electrode connection terminal 41 is formed of an integral metal foil, a bent portion may be provided in the same manner as the negative electrode connection terminal 42.

  In the said embodiment, although the negative electrode connection terminal 42 is comprised by integral metal foil, the structure by which the several member was welded may be sufficient.

  In the embodiment, after forming the second bent portion 42 b of the negative electrode connecting terminal 42, the insulating tape 50 is applied so as to cover the second bent portion 42 b, and then the second bent portion is applied to the positive electrode connecting terminal 41. A portion 41d is formed. However, the present invention is not limited to this. After first forming the second bent portion 41d of the positive electrode connecting terminal 41, the insulating tape 50 is pasted so as to cover the second bent portion 41d, and then the negative electrode connecting terminal 42 is formed. The second bent portion 42b may be formed. Further, the second bent portion 41d of the positive electrode connecting terminal 41 and the second bent portion 42b of the negative electrode connecting terminal 42 may be simultaneously fixed on the tab seal portion 1d by the insulating tape 50.

  In the embodiment, the laminated battery is formed in a rectangular shape in plan view. However, the laminated battery may have other shapes such as a polygonal shape.

  In the embodiment, the laminated battery 1 is a lithium ion battery. However, the laminated battery 1 may be a battery other than a lithium ion battery.

  The present invention can be used for a laminated battery in which an electrode body is covered with a laminated film outer package.

DESCRIPTION OF SYMBOLS 1 Laminated battery 1a Bulging part 1b Sealing part (welding part)
1c Plane portion 1d Tab seal portion 1e Folded portion 1f Lateral welded portion 10 Electrode body 20 Laminate film exterior body 41 Positive electrode connection terminal 41a Aluminum metal foil 41b Nickel metal foil 41c First bent portion 41d Second bent portion 42 Negative electrode Connection terminal 42a first bent portion 42b second bent portion 45 positive electrode side resin portion 46 negative electrode side resin portion)
50 Insulation tape (fixing member)
60 Fixing tape (fixing member)

Claims (5)

An electrode body;
A sheet-like laminate film outer package in which a bulging portion covering the electrode body and a welding portion protruding outward from the bulging portion are formed by welding the outer peripheral side in a state of covering the electrode body. When,
One end side is connected to the electrode body, and the other end side is provided so as to extend in one direction outward from the laminate film exterior body, and a negative electrode connection terminal and a negative electrode connection terminal,
Of the welded portions, the side welded portions extending in the one direction along the electrode body are bent in the thickness direction of the laminated film outer body, and the both ends of the one direction in the laminated film outer body are A laminated battery comprising: a fixing member fixed at at least one end. The laminated battery according to claim 1, wherein
The laminate film exterior body is disposed with respect to the electrode body so as to form a flat portion on the side opposite to the bulging portion across the electrode body,
The said side weld part is a laminated battery which is bend | folded so that it may overlap on the said plane part by planar view of the said laminate film exterior body. The laminated battery according to claim 1 or 2,
The said fixing member is a laminate type battery which fixes the said side weld part in the state which bent the thickness direction of the said laminate film exterior body at the both ends of the said one direction in the said laminate film exterior body. The laminated battery according to claim 3,
Each of the positive electrode connection terminal and the negative electrode connection terminal is folded in a portion extending outward from the laminate film exterior body at a position overlapping with the laminate film exterior body in a plan view of the laminate film exterior body. Has a curved part,
Among the fixing members, the fixing member that fixes the side welding portion at an end portion where the positive electrode connection terminal and the negative electrode connection terminal are provided in the laminate film outer package is a tape made of an insulating material, and the positive electrode From the position between the bent portion of one of the connection terminals and the laminate film exterior body among the connection terminal and the negative electrode connection terminal, the bent portion of the other connection terminal of the positive electrode connection terminal and the negative electrode connection terminal. A laminated battery arranged to extend to a covering position. The laminated battery according to claim 4, wherein
The laminate film exterior body has a connection covering portion that covers a connection side of the positive electrode connection terminal and the negative electrode connection terminal with the electrode body,
The positive electrode connection terminal and the negative electrode connection terminal are laminate-type batteries in which respective bent portions are positioned so as to overlap the connection covering portion in a plan view of the laminate film outer package.

Images