Lead wire for nonaqueous electrolyte battery

Abstract

A lead wire for a non-aqueous electrolyte battery has a conductor, and a first insulating resin film and a second insulating resin film disposed on the upper surface and the lower surface of the conductor, and when the conductor is viewed in a direction perpendicular to the upper surface, the X-axis is an axis along two selected opposite sides, and the Y-axis is an axis orthogonal to the X-axis, the X-axis is an X-axis, and the Y-axis is an axis orthogonal to the Y-axis. The first insulating resin film and the second insulating resin film are disposed so as not to cover both end portions of the conductor along the Y-axis, but so as to cover the conductor across the conductor along the X-axis at portions other than both end portions of the conductor, and so as to overlap each other when viewed in a direction perpendicular to the upper surface. At least one of the first insulating resin film and the second insulating resin film has a first film layer and a second film layer in this order from a position closer to the conductor, the second film layer is disposed such that a part of the surface of the first film layer is exposed, and the type of resin of the second film layer is different from the type of resin of the first film layer.

Description

Technical Field

[0001] The present disclosure relates to a lead for a nonaqueous electrolyte battery. Background Art

[0002] Patent document 1 discloses a film-type battery, which comprises: a film outer casing; an electrode body, which is accommodated inside the film outer casing and has an electrode; a plate-shaped terminal, one end of which is electrically connected to the electrode and the other end of which extends to the outside of the film outer casing; a sealing portion, which is provided at an edge of at least one side of the film outer casing from which the terminal extends; and a sealant film, which is integrated with a surface of the terminal on a side opposite to the film outer casing and is welded to the film outer casing at the sealing portion, the sealant film having a cutout portion, and the cutout portion is formed so that the width of the sealing portion in the direction in which the terminal extends is narrower than that of other portions.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2022-100451

[0006] In non-aqueous electrolyte batteries such as lithium-ion secondary batteries, when repeatedly charged and discharged, the electrolyte may react and generate gas in the container of the non-aqueous electrolyte battery. From the viewpoint of preventing damage to the non-aqueous electrolyte battery, it is required to be configured so that when gas is generated in the non-aqueous electrolyte battery, the gas can be discharged outside the system. Summary of the invention

[0007] Therefore, an object of the present disclosure is to provide a lead for a non-aqueous electrolyte battery which, when applied to a battery, can discharge gas generated in the battery to the outside of a container.

[0008] The lead for a non-aqueous electrolyte battery disclosed in the present invention comprises: a plate-like conductor having an upper surface and a lower surface of the plate-like conductor in a rectangular shape; a first insulating resin film disposed on the upper surface of the conductor; and a second insulating resin film disposed on the lower surface of the conductor, wherein when the conductor is observed in a direction perpendicular to the upper surface, an axis along two selected opposite sides is set as an X axis, and an axis orthogonal to the X axis is set as a Y axis, the first insulating resin film and the second insulating resin film are disposed so as not to cover both ends of the conductor along the Y axis but to cover the conductor in a portion other than the both ends of the conductor so as to cross the conductor along the X axis, and the first insulating resin film and the second insulating resin film overlap each other when observed in a direction perpendicular to the upper surface, at least one of the first insulating resin film and the second insulating resin film comprises a first film layer and a second film layer in order from a position close to the conductor, the second film layer is disposed so as to expose a portion of the surface of the first film layer, and the type of resin of the second film layer is different from the type of resin of the first film layer.

[0009] Effects of the Invention

[0010] According to the present disclosure, it is possible to provide a non-aqueous electrolyte battery lead which, when applied to a battery, can discharge gas generated in the battery to the outside of a container. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is an explanatory diagram of a battery to which the lead for a nonaqueous electrolyte battery according to one embodiment of the present disclosure is applied.

[0012] Figure 2 This is a top view of a lead for a nonaqueous electrolyte battery according to one embodiment of the present disclosure.

[0013] Figure 3A is along Figure 1 Cross-sectional view of line A-A′.

[0014] Figure 3B is along Figure 1 Another configuration example of the cross-sectional view along the line AA′.

[0015] Figure 4 This is a top view of a lead for a nonaqueous electrolyte battery according to another embodiment of the present disclosure.

[0016] Figure 5 This is a top view of a lead for a nonaqueous electrolyte battery according to another embodiment of the present disclosure.

[0017] Description of Reference Numerals

[0018] 10: Battery;

[0019] 11: Exterior body;

[0020] 12: electrode stack;

[0021] 13: Lead wire;

[0022] 14: Conductor;

[0023] 14A: Edge;

[0024] 14B: Edge;

[0025] 14C: Edge;

[0026] 14D: edge;

[0027] L14: length;

[0028] W14: length;

[0029] X: X-axis;

[0030] Y: Y axis;

[0031] Z: Z axis;

[0032] 15: Insulating resin film;

[0033] 15A: first insulating resin film;

[0034] 15B: second insulating resin film;

[0035] 21: first end region;

[0036] 22: second end region;

[0037] 31: hollow arrow;

[0038] 110: sealing part;

[0039] 111: first resin layer;

[0040] 112: metal layer;

[0041] 113: second resin layer;

[0042] 141: upper surface;

[0043] 142: lower surface;

[0044] 151: first film layer;

[0045] 151a: basal layer;

[0046] 151b: surface layer;

[0047] 151c: middle layer;

[0048] 1511: exposed part;

[0049] 151A: Edge;

[0050] 151B: edge;

[0051] L151: length;

[0052] W151: length;

[0053] 152: second film layer;

[0054] 152A: Edge;

[0055] 152B: edge;

[0056] L152: length;

[0057] W152: length;

[0058] W1521: length;

[0059] W1522: Length. DETAILED DESCRIPTION

[0060] Hereinafter, specific implementation modes will be described.

[0061] [Description of Embodiments of the Present Disclosure]

[0062] First, the embodiments of the present disclosure will be described by way of example. In the following description, the same reference numerals are given to the same or corresponding elements, and the same description thereof will not be repeated.

[0063] (1) A lead for a nonaqueous electrolyte battery according to one embodiment of the present disclosure comprises: a plate-like conductor having upper and lower surfaces in a rectangular shape; a first insulating resin film disposed on the upper surface of the conductor; and a second insulating resin film disposed on the lower surface of the conductor, wherein when the conductor is viewed in a direction perpendicular to the upper surface, an axis along two selected opposite sides is defined as an X axis and an axis orthogonal to the X axis is defined as a Y axis, the first insulating resin film and the second insulating resin film are disposed so as not to cover both ends of the conductor along the Y axis but to cover the conductor in a portion other than the both ends of the conductor so as to cross the conductor along the X axis, and the first insulating resin film and the second insulating resin film overlap each other when viewed in the direction perpendicular to the upper surface, and at least one of the first insulating resin film and the second insulating resin film comprises a first film layer and a second film layer in order from a position close to the conductor, the second film layer being disposed so as to expose a portion of a surface of the first film layer, and the type of resin of the second film layer is different from the type of resin of the first film layer.

[0064] When a lead for a non-aqueous electrolyte battery (hereinafter, also referred to as a "lead") according to one embodiment of the present disclosure is applied to a non-aqueous electrolyte battery (hereinafter, also referred to as a "battery"), a plate-shaped conductor can be closely connected and joined to an outer casing corresponding to a container of the battery via an insulating resin film. Therefore, by having an insulating resin film, a sealing portion can be formed along the periphery of the outer casing including a portion where the lead is arranged, thereby sealing the electrode stack and the electrolyte.

[0065] Furthermore, the second film layer can adjust the adhesion between the insulating resin film and the outer casing of the battery.

[0066] Specifically, the adhesion between the insulating resin film and the battery exterior body can be weakened at the portion where the second film layer is in contact with the battery exterior body compared to the portion where the first film layer is in contact with the battery exterior body.

[0067] Therefore, since the insulating resin film has the second film layer, when the pressure inside the outer casing of the battery increases, the second insulating resin film can be cracked starting from the portion where the second insulating resin film and the outer casing of the battery are in contact. In addition, a gas discharge path can be formed to discharge the gas inside the outer casing of the battery to the outside, so even if gas is generated inside the outer casing of the battery, the battery can be prevented from being damaged.

[0068] (2) In the above (1), it may also be that the length of the second film layer along the X-axis and the length along the Y-axis are both shorter than the length of the first film layer along the X-axis and the length along the Y-axis, and the first film layer and the second film layer are configured as follows: one edge of the first film layer and the second film layer are positioned in the same position on the Y-axis.

[0069] The second film layer has a shorter length along the X-axis of the conductor and a shorter length along the Y-axis of the conductor than the first film layer, thereby increasing the exposed area of ​​the first film layer. Therefore, when applied to a battery, the adhesion between the outer casing of the battery and the insulating resin film can be particularly improved, and the working pressure as the pressure for discharging the gas inside the outer casing to the outside can be adjusted.

[0070] The configuration is such that one edge of the first film layer and one edge of the second film layer are aligned in position on the Y axis, so that when the lead is applied to the battery, one edge of the second film layer can be arranged inside the outer casing of the battery. Therefore, when the pressure inside the outer casing increases, one edge of the second film layer can directly contact the gas generated inside the outer casing, thereby easily cracking. Therefore, when the pressure inside the outer casing increases, the responsiveness to the pressure can be increased, and when the pressure inside the outer casing reaches the desired pressure, the gas inside the outer casing can be discharged to the outside.

[0071] (3) In the above (1), it may also be that the length obtained by subtracting the length of the second film layer along the Y axis from the length of the first film layer along the Y axis is greater than 0 mm and less than 1 mm, the length of the second film layer along the X axis is shorter than the length of the first film layer along the X axis, and the first film layer and the second film layer are configured such that one side of the first film layer and one side of the second film layer are aligned in position on the Y axis.

[0072] When the length of the second film layer along the Y axis is equal to the length of the first film layer along the Y axis, the second film layer can be configured to connect the inside and outside of the outer casing of the battery. As a result, when the pressure inside the outer casing increases, the working pressure, which is the pressure for discharging the gas inside the outer casing to the outside, can be reduced.

[0073] (4) In the above (1), the lengths of the sides of the second film layer at both ends of the Y-axis may be different, and the first film layer and the second film layer may be configured such that one side of the first film layer and one side of the second film layer are aligned in position on the Y-axis.

[0074] By adopting a configuration in which the lengths of the sides of the second film layer at both ends along the Y-axis of the conductor are different, the responsiveness to the pressure in the outer casing and the ease with which the gas in the outer casing can be released to the outside can be adjusted.

[0075] (5) In any one of the above (1) to (4), the first film layer may contain one or more resins selected from polyolefin resins, polyester resins, polystyrene resins, and polyvinyl chloride resins.

[0076] The first film layer contains one or more selected from polyolefin resins, polyester resins, polystyrene resins, and polyvinyl chloride resins as resins, thereby improving the adhesion between the insulating resin film and the exterior body.

[0077] (6) In any one of the above (1) to (5), the second film layer may include one or more selected from polyimide resins, polyester resins, and fluorine-based resins as resins.

[0078] The second film layer contains one or more selected from polyimide resins, polyester resins, and fluorine-based resins as the resin, whereby the adhesion strength between the insulating resin film and the exterior body can be easily adjusted.

[0079] [Details of the embodiments of the present disclosure]

[0080] Hereinafter, a specific example of a lead for a non-aqueous electrolyte battery according to an embodiment of the present disclosure (hereinafter, referred to as "this embodiment") is described with reference to the accompanying drawings. It should be noted that the present invention is not limited to these examples, but is shown by the claims, and is intended to include all changes within the meaning and scope equivalent to the claims.

[0081] In this specification, the names of components may be described by adding "first", "second", etc., such as "first insulating resin film", "second insulating resin film", "first film layer", and "second film layer". "First", "second", etc. are only recorded to distinguish the components and prevent confusion during description, and do not indicate arrangement, priority, etc. Therefore, especially when there is no possibility of confusion or when collectively expressing, they may be simply recorded as "insulating resin film" or "film layer".

[0082] [Lead wire for non-aqueous electrolyte batteries]

[0083] Figure 1 2 is an explanatory diagram of a configuration example in which the lead for a nonaqueous electrolyte battery according to the present embodiment is applied to a nonaqueous electrolyte battery. Figure 2 This is an explanatory diagram when the lead for a nonaqueous electrolyte battery according to the present embodiment is viewed in a direction perpendicular to the upper surface of the conductor. Figure 3A Shown along Figure 1 Cross-sectional view of line A-A′. Figure 3B The equivalent of Figure 1 Another configuration example of the cross-sectional view along the line AA′. Figure 4 , Figure 5 2 is an explanatory diagram showing another configuration example of the lead for a nonaqueous electrolyte battery according to the present embodiment. Figure 3B , Figure 4 , Figure 5 This is a modified example of the lead wire of this embodiment, so it is mainly used Figure 1 , Figure 2 , Figure 3A To illustrate, use Figure 3B , Figure 4 , Figure 5 .

[0084] Figure 1 , Figure 2 , Figure 3A , Figure 3B , Figure 4 , Figure 5 The Z axis in FIG. 1 is an axis along the thickness of the conductor and the insulating resin film included in the lead wire of the present embodiment.

[0085] The lead wire 13 of the present embodiment can be applied to a nonaqueous electrolyte battery. Therefore, after describing a battery to which the lead wire 13 of the present embodiment can be applied, the details of the lead wire 13 of the present embodiment will be described.

[0086] (1) About batteries

[0087] use Figure 1 A configuration example of a battery to which the lead wire 13 of this embodiment is applied will be described. Figure 1 As shown, the battery 10 may include: an outer casing 11 ; an electrode stack 12 in which a positive electrode, a separator, and a negative electrode are stacked and impregnated with an electrolyte; and a lead 13 in one embodiment of the present disclosure connected to the electrode stack 12 .

[0088] (outer body)

[0089] The outer casing 11 is a container that accommodates and seals the electrode stack 12 and the electrolyte. The outer casing 11 may have at least one resin layer disposed on a surface facing the electrode stack 12 so as to be heat-weldable.

[0090] The outer body 11 is a so-called laminate film, and may be, for example, Figure 3A As shown, it has a structure in which a first resin layer 111, a metal layer 112 and a second resin layer 113 are stacked.

[0091] The type of resin used for the first resin layer 111 is not particularly limited, and a thermoplastic resin can be preferably used. The first resin layer 111 can preferably use the same thermoplastic resin as the first film layer 151 described later, so the description thereof is omitted.

[0092] The metal layer 112 is a layer for improving airtightness, and a layer including a metal material such as aluminum, iron, or stainless steel can be used.

[0093] The second resin layer 113 is a layer for improving durability and impact resistance, and may be made of, for example, the same resin as the first resin layer 111 , and preferably a thermoplastic resin.

[0094] like Figure 1 As indicated by the dashed line, a sealing portion 110 is formed on the periphery of the outer casing 11 , and the sealing portion 110 seals the electrode stack 12 and the electrolyte solution.

[0095] (2) About leads

[0096] The lead 13 of the present embodiment is also called a tab or the like, and includes a conductor 14 and an insulating resin film 15 .

[0097] Each member included in the lead 13 will be described.

[0098] (2-1) Conductor

[0099] The conductor 14 is a member for connecting the electrode stack 12 disposed in the outer casing 11 to a device disposed outside the outer casing 11. The conductor 14 may be in a plate shape, with an upper surface 141 and a lower surface 142 (see Figure 3A ) has a rectangular shape. Figure 2 As shown, the upper surface 141 of the conductor 14 may have a rectangular or square shape, and the rectangle or square has two opposite sides, namely, side 14A and side 14B, and side 14C and side 14D intersecting side 14A and side 14B. However, the rectangular shape, rectangular shape, and square shape do not refer to strict geometric shapes, and the conductor 14 may have, for example, a concave portion, a convex portion, etc. required for connection with the electrode stack 12 or external devices.

[0100] In the following description, when conductor 14 is viewed from above in a direction perpendicular to upper surface 141 , an axis along selected two opposing sides, side 14A and side 14B, is referred to as an X axis, and an axis orthogonal to the X axis is referred to as a Y axis.

[0101] The material of the conductor 14 is not particularly limited, and various materials used for conductors of lead wires for non-aqueous electrolyte batteries can be used, for example. Examples of the material of the conductor 14 include metal materials such as aluminum, titanium, nickel, copper, aluminum alloys, titanium alloys, nickel alloys, and copper alloys, and materials obtained by plating these metal materials with nickel, gold, and the like.

[0102] (2-2) Insulating resin film

[0103] The insulating resin film 15 includes a first insulating resin film 15A disposed on the upper surface 141 of the conductor 14 and a second insulating resin film 15B disposed on the lower surface 142 of the conductor 14 (see Figure 3A ).like Figure 2 , Figure 3A As shown, in the upper surface 141 and the lower surface 142, the first insulating resin film 15A and the second insulating resin film 15B are arranged so as not to cover the two ends of the conductor 14 along the Y axis, that is, the two ends including the side 14A and the side 14B, but to expose them. In addition, in the upper surface 141 and the lower surface 142, the first insulating resin film 15A and the second insulating resin film 15B are arranged so as to cover the conductor 14 in the middle part other than the two ends of the conductor 14 along the Y axis, so as to cross the conductor 14 along the X axis.

[0104] First insulating resin film 15A and second insulating resin film 15B are arranged so that first insulating resin film 15A arranged on upper surface 141 and second insulating resin film 15B arranged on lower surface 142 overlap each other when viewed in a direction perpendicular to upper surface 141 .

[0105] The upper surface 141 and the lower surface 142 of the conductor 14 are surfaces that face the outer casing 11 of the battery 10 when the battery 10 is manufactured.

[0106] like Figure 2 As shown, both ends of the conductor 14 along the Y axis are a first end region 21 including the side 14A and a second end region 22 including the side 14B. The middle portion is a portion located between the first end region 21 and the second end region 22.

[0107] When the lead 13 is applied to a battery, the first end region 21 is, for example, a portion exposed to the outside of the outer body 11, and its size can be selected so that it can be connected to an external device. In addition, when the lead 13 is applied to a battery, the second end region 22 is, for example, a portion located inside the outer body 11 and connected to the electrode stack 12, and its size can be selected so that it can be connected to the electrode stack 12. The dimensions such as the area of ​​the first end region 21 and the dimensions such as the area of ​​the second end region 22 can be the same or different.

[0108] When the lead 13 of the present embodiment is applied to a battery, the plate-shaped conductor 14 can be closely bonded to the outer casing 11 of the battery 10 via the insulating resin film 15. Therefore, since the lead 13 of the present embodiment has the insulating resin film 15, the sealing portion 110 can be formed along the periphery of the outer casing 11 including the portion where the lead 13 is arranged (see Figure 1 ) to seal the electrode stack 12 and the electrolyte.

[0109] At least one of the first insulating resin film 15A and the second insulating resin film 15B includes a first film layer 151 and a second film layer 152 in order from the position close to the conductor 14 (see Figure 2 , Figure 3A That is, at least one of the first insulating resin film 15A and the second insulating resin film 15B has a structure in which a first film layer 151 and a second film layer 152 are sequentially stacked on the conductor 14 .

[0110] exist Figure 3A In the embodiment, both the first insulating resin film 15A and the second insulating resin film 15B have the first film layer 151 and the second film layer 152, but the present invention is not limited to this embodiment. For example, only the first insulating resin film 15A may have the first film layer 151 and the second film layer 152, and the second insulating resin film 15B may have only the first film layer 151.

[0111] (First film layer)

[0112] The first film layer 151 is a layer for achieving heat fusion bonding with the outer body 11 when applied to a battery. Therefore, the first film layer 151 preferably contains a thermoplastic resin as a resin. As a thermoplastic resin, for example, one or more selected from polyolefin resins, polyester resins, polystyrene resins, polyvinyl chloride resins, etc. can be used. As polyolefin resins, acid-modified polyolefin resins such as polyethylene, polypropylene, acid-modified polyethylene, and acid-modified polypropylene are cited. As polyester resins, for example, polyethylene terephthalate resins are cited. As acid-modified polyolefins, maleic anhydride-modified polyolefins are cited.

[0113] The first film layer 151 contains one or more selected from polyolefin resins, polyester resins, polystyrene resins, polyvinyl chloride resins, and the like as resins, thereby improving the adhesion between the insulating resin film 15 and the exterior body.

[0114] The first film layer 151 may also be Figure 3A , Figure 3B As shown in FIG. 1 , the first film layer 151 may be composed of two or more layers. Figure 3A As shown in FIG. 1 , the first film layer 151 may have a base layer 151a and a surface layer 151b. Figure 3B As shown, it has a base layer 151a, an intermediate layer 151c and a surface layer 151b.

[0115] When the first film layer 151 has multiple layers, each layer may be formed for the purpose of adjusting the adhesion with the conductor 14 and the outer body 11, adjusting the strength of the layer derived from the first film layer 151 after being bonded to the outer body 11, etc. Therefore, for each layer, the material can be selected according to the intended function, etc. When the first film layer 151 has multiple layers, for example, the thermoplastic resin described above can be preferably used for each layer. In the first insulating resin film 15A and the second insulating resin film 15B, the material of the first film layer 151, the number of layers constituting the first film layer 151, etc. may also be different.

[0116] The first film layer 151 may have a rectangular shape when viewed in a direction perpendicular to the upper surface 141 of the conductor 14. However, the rectangular shape here does not have a strict geometrical meaning, and for example, the corners of the vertices may be processed to form curves.

[0117] The first film layer 151 is arranged on the upper surface 141 and the lower surface 142 of the conductor 14 in such a manner that the two ends of the conductor 14 along the Y axis of the conductor 14 are exposed, and the middle portion other than the two ends of the conductor 14 covers the entire side 14A and the side 14B along the upper surface 141. That is, the first film layer 151 is arranged to expose the first end region 21 and the second end region 22 of the conductor 14. Therefore, the length L151 of the first film layer 151 along the Y axis is shorter than the length L14 of the conductor 14 along the Y axis.

[0118] In addition, the length W151 of the first film layer 151 along the X-axis is longer than the length W14 of the conductor 14 along the X-axis. Therefore, the first film layer 151 can be configured to extend along both sides of the conductor 14 in the X-axis direction. In addition, the first film layer 151 configured on the upper surface 141 of the conductor 14 and the first film layer 151 configured on the lower surface 142 of the conductor 14 can be bonded to each other at the portion extending from the conductor 14. By configuring the first film layer 151 to extend along both sides of the conductor 14 in the X-axis direction and bonding the first film layer 151 configured on the upper surface 141 and the lower surface 142 of the conductor 14 to each other, the adhesion between the conductor 14 and the first film layer 151 is improved.

[0119] The shapes of the first film layers 151 respectively arranged on the upper surface 141 and the lower surface 142 of the conductor 14 may be the same or different. However, from the viewpoint of mutual adhesion at the portions extending from the conductor 14 as described above, the first film layers 151 arranged on the upper surface 141 and the lower surface 142 of the conductor 14 are preferably the same shape.

[0120] The first film layer 151 may be welded to the conductor 14 or may be adhered to the conductor 14 by an adhesive or the like.

[0121] (Second film layer)

[0122] The second film layer 152 is configured to expose a portion of the surface of the first film layer 151, and may use a different type of resin from the first film layer 151. In the case where the first film layer 151 has multiple layers, the second film layer 152 may use a different type of resin from the surface layer 151b which is the layer closest to the second film layer 152 in the first film layer 151. The first film layer 151 and the second film layer 152 may also be bonded together via an adhesive.

[0123] The second film layer 152 can adjust the adhesion between the insulating resin film 15 and the exterior body 11 of the battery 10 .

[0124] Specifically, the contact between the insulating resin film 15 and the outer casing 11 of the battery 10 can be weakened at a location where the second film layer 152 contacts the outer casing 11 of the battery 10 compared to a location where the first film layer 151 contacts the outer casing 11 of the battery 10 .

[0125] Therefore, the insulating resin film 15 has the second film layer 152, and when the pressure inside the outer casing 11 of the battery 10 increases, the second film layer 152 can be cracked starting from the portion where the second film layer 152 and the outer casing 11 of the battery 10 are in contact. Figure 1 , Figure 3A As shown by hollow arrows 31 , a gas discharge path is formed to discharge the gas in the outer casing 11 of the battery 10 to the outside. Therefore, even if gas is generated in the outer casing 11 of the battery 10 , damage to the battery 10 can be prevented.

[0126] The adhesion between the exterior body 11 and the insulating resin film 15 can be adjusted by selecting the material, shape, and area of ​​the second film layer 152 .

[0127] Therefore, the second film layer 152 may be formed of a resin of a different type from that of the first film layer 151. By using a resin of a different type from that of the first film layer 151 for the second film layer 152, the adhesion between the insulating resin film 15 and the outer casing 11 of the battery 10 can be adjusted.

[0128] The second film layer 152 is preferably a resin that is less easily melted than the first film layer 151 when the outer body 11 is heat-sealed. Therefore, the resin used for the second film layer 152 is preferably a resin having a higher melting point than the first film layer 151. The second film layer 152 may include, for example, one or more selected from polyimide resins, polyester resins, and fluorine-based resins as the resin.

[0129] Examples of the polyester resin include polyethylene terephthalate resin and the like.

[0130] As the fluorine-based resin, for example, one or more selected from polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polyvinylidene fluoride (PVDF), ethylene-tetrafluoroethylene copolymer (ETFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), etc. can be used.

[0131] The second film layer 152 contains one or more selected from polyimide resins, polyester resins, and fluorine-based resins as resins, whereby the adhesion strength between the insulating resin film 15 and the exterior body can be easily adjusted.

[0132] In addition, the second film layer 152 may be configured such that the area of ​​the second film layer 152 is smaller than the area of ​​the first film layer 151. Therefore, the second film layer 152 may be configured to expose a portion of the surface of the first film layer 151, that is, to generate an exposed portion 1511 that exposes the first film layer 151. By configuring the second film layer 152 to expose a portion of the surface of the first film layer 151, when the lead 13 is applied to the battery, the closeness between the insulating resin film 15 and the outer casing 11 of the battery 10 can be adjusted.

[0133] When both the first insulating resin film 15A and the second insulating resin film 15B have the second film layer 152 , the material, shape, and area of ​​the second film layer 152 in the first insulating resin film 15A and the second insulating resin film 15B may be different or the same.

[0134] Hereinafter, a configuration example of the shape of the second film layer 152 will be described.

[0135] (First Configuration Example)

[0136] For example, it can also be Figure 2 As shown, the length of the second film layer 152 along the X-axis and the length along the Y-axis are shorter than the length of the first film layer 151 along the X-axis and the length along the Y-axis.

[0137] That is, the length L152 of the second film layer 152 along the Y axis can be set to be shorter than the length L151 of the first film layer 151 along the Y axis (L151>L152). In addition, the length W152 of the second film layer 152 along the X axis can be set to be shorter than the length W151 of the first film layer 151 along the X axis of the conductor 14 (W151>W152).

[0138] The second film layer 152 has a shorter length along the X-axis and a shorter length along the Y-axis than the first film layer 151, thereby increasing the exposed area of ​​the first film layer 151. Therefore, when applied to the battery 10, the adhesion between the outer casing 11 of the battery 10 and the insulating resin film 15 can be particularly improved, and the working pressure as the pressure for discharging the gas inside the outer casing 11 to the outside can be adjusted.

[0139] In addition, the first film layer 151 and the second film layer 152 may be configured such that one side of the first film layer 151 and the second film layer 152 are aligned in position on the Y axis.

[0140] exist Figure 2 In the illustrated embodiment, the side 152A of the second film layer 152 is arranged to coincide with the side 151A of the first film layer 151 on the Y axis. It should be noted that in this configuration example, the side 152B of the second film layer 152 is not arranged to coincide with the side 151B of the first film layer 151 on the Y axis.

[0141] For example, when the lead 13 is applied to a battery, when the second end region 22 of the conductor 14 is configured to be located inside the outer body 11, the side 152A of the second film layer 152 and the side 151A of the first film layer 151 are arranged inside the outer body 11. Therefore, when the pressure inside the outer body 11 increases, the side 152A, which is one side of the second film layer 152, can directly contact the gas generated inside the outer body 11, and thus easily crack. Therefore, when the pressure inside the outer body 11 increases, the responsiveness to the pressure can be increased, and when the pressure inside the outer body 11 reaches the desired pressure, the gas inside the outer body 11 can be discharged to the outside.

[0142] (Second Configuration Example)

[0143] For example, Figure 4 As shown, the length (L151-L152) obtained by subtracting the length L152 of the second film layer 152 along the Y axis from the length L151 of the first film layer 151 along the Y axis is set to be greater than or equal to 0 mm and less than or equal to 1 mm.

[0144] That is, for example, Figure 4 As shown in the figure, L151=L152 may be set, and the length L152 of the second film layer 152 may be shorter than the length L151 of the first film layer 151 by 1 mm or less.

[0145] In this case, a length W152 of the second film layer 152 along the X-axis may be shorter than a length W151 of the first film layer 151 along the X-axis, ie, W152<W151.

[0146] In the case where the lead wire 13 is applied to a battery, as Figure 1 As shown, the outer casing 11 is configured to cover a portion of the first film layer 151 along the Y axis. Therefore, when the length L152 of the second film layer 152 along the Y axis is made the same as the length L151 of the first film layer 151 along the Y axis, the second film layer 152 can be configured to connect the inside and outside of the outer casing 11 of the battery 10. As a result, when the pressure inside the outer casing 11 increases, the working pressure, which is the pressure for discharging the gas inside the outer casing 11 to the outside, can be reduced.

[0147] The effect when L151>L152 is as described above.

[0148] In addition, the first film layer 151 and the second film layer 152 may be configured such that one side of the first film layer 151 and the second film layer 152 are aligned in position on the Y axis.

[0149] exist Figure 4In the illustrated embodiment, the side 152A of the second film layer 152 is arranged to coincide with the side 151A of the first film layer 151 in position on the Y axis.

[0150] This effect is the same as that of the first configuration example, and therefore the description of the effect will be omitted.

[0151] (Third Configuration Example)

[0152] For example, you can Figure 5 As shown, the second film layer 152 has sides at both ends along the Y axis with different lengths.

[0153] exist Figure 5 In the illustrated example, the length W1521 of the side 152A located at both ends of the Y axis of the second film layer 152 is different from the length W1522 of the side 152B, and W1522<W1521.

[0154] By adopting a configuration in which the lengths of the sides of the second film layer 152 at both ends of the Y axis are different, the responsiveness to the pressure in the outer casing 11 and the ease with which the gas in the outer casing 11 can be released to the outside can be adjusted.

[0155] In the case of a battery, when the length W1521 of the side 152A disposed in the outer casing 11 is made longer than the length W1522 of the side 152B, the adhesion at the end portion where the insulating resin film 15 in the outer casing 11 contacts the outer casing 11 becomes smaller than when the length of the side 152A and the length of the side 152B are the same as the length W1522 of the side 152B. Thus, when the pressure in the outer casing 11 increases, the working pressure, which is the pressure for discharging the gas inside the outer casing 11 to the outside, can be reduced.

[0156] The length W1521 of the side 152A and the length W1522 of the side 152B can be selected according to the required working pressure and are not particularly limited.

[0157] The length L152 of the second film layer 152 along the Y axis is not particularly limited. For example, as in the case of the first configuration example, the length L152 of the second film layer 152 along the Y axis of the conductor 14 may be shorter than the length L151 of the first film layer 151 along the Y axis of the conductor 14 (L151>L152). In addition, as in the case of the second configuration example, the length obtained by subtracting the length L152 of the second film layer 152 along the Y axis from the length L151 of the first film layer 151 along the Y axis may be set to be greater than 0 mm and less than 1 mm.

[0158] In addition, the first film layer 151 and the second film layer 152 may be configured such that one side of the first film layer 151 and the second film layer 152 are aligned in position on the Y axis.

[0159] exist Figure 5 In the illustrated embodiment, the side 152A of the second film layer 152 is arranged to coincide with the side 151A of the first film layer 151 in position on the Y axis.

[0160] This effect is the same as that of the first configuration example, and therefore the description of the effect will be omitted.

[0161] [Example]

[0162] Hereinafter, specific examples will be given for description, but the present invention is not limited to these examples.

[0163] (Evaluation method)

[0164] First, the evaluation method of the lead wire and battery produced in the following experimental examples will be described.

[0165] A tube was connected to the outer casing 11 of the battery produced in the following experimental example, and air was supplied to the interior of the outer casing 11 at a certain pressure and flow rate through the tube. The pressure in the tube at this time was measured, and the pressure at the time when the air was discharged from the outer casing 11 and the increase in the pressure in the tube stopped was evaluated as the working pressure.

[0166] Furthermore, soapy water was sprayed around the outer casing 11 of the battery, and the location where air was exhausted was observed.

[0167] Hereinafter, the lead wire and the battery in each experimental example will be described.

[0168] Experimental Examples 1 to 3 are examples, and Experimental Example 4 is a comparative example. In Experimental Examples 1 to 4, the first insulating resin film 15A and the second insulating resin film 15B have the same structure.

[0169] [Experimental Example 1]

[0170] Produced Figure 2 , Figure 3A The lead wire 13 shown was provided, and a battery 10 using two of the lead wires 13 was manufactured. The first film layer 151 has two layers, starting from a position close to the conductor 14, of a base layer 151a comprising maleic anhydride-modified polypropylene and a surface layer 151b comprising polypropylene.

[0171] As the exterior body 11 , a laminate film is used in which the first resin layer 111 and the second resin layer 113 are polypropylene films and the metal layer 112 is aluminum foil.

[0172] In this experimental example, the positions of the lead wires 13 and the outer casing 11 were adjusted so that the second film layer 152 was completely covered by the outer casing 11 .

[0173] And, if Figure 1 As shown, the outer casing 11 is arranged so as to cover a part of the insulating resin film 15 of the lead wire 13, and a sealing portion 110 is formed by heat welding. At this time, a pipe for supplying air during evaluation is provided on one side where the lead wire 13 is not arranged.

[0174] It should be noted that since the electrode stack 12 was produced for evaluation, it was not arranged in the exterior body 11 .

[0175] When the obtained battery was subjected to the above evaluation, the operating pressure was 0.30 MPa, and it was confirmed that air was discharged from the portion of the lead 13 where the second film layer 152 was provided.

[0176] [Experimental Example 2]

[0177] In addition to lead 13 becoming Figure 4 Except for the configuration shown, a lead wire and a battery were produced and evaluated under the same conditions as in Experimental Example 1.

[0178] It should be noted that the lead 13 is configured such that the length L151 of the first film layer 151 along the Y axis is the same as the length L152 of the second film layer 152 along the Y axis.

[0179] In the battery produced in this experimental example, the positions of the lead 13 and the exterior body 11 were adjusted so that only a portion of the second film layer 152 was covered by the exterior body 11 .

[0180] When the obtained battery was subjected to the above evaluation, the operating pressure was 0.05 MPa, and it was confirmed that air was discharged from the portion of the lead 13 where the second film layer 152 was provided.

[0181] [Experimental Example 3]

[0182] In addition to lead 13 becoming Figure 5 Except for the configuration shown, a lead wire and a battery were produced and evaluated under the same conditions as in Experimental Example 1.

[0183] It should be noted that the length L152 of the second film layer 152 along the Y axis is shorter than the length L151 of the first film layer 151 along the Y axis of the conductor 14 , and L151>L152.

[0184] In the battery produced in this experimental example, the positions of the lead 13 and the outer casing 11 were adjusted so that the second film layer 152 was completely covered by the outer casing 11 .

[0185] When the obtained battery was subjected to the above evaluation, the operating pressure was 0.20 MPa, and it was confirmed that air was discharged from the portion of the lead 13 where the second film layer 152 was provided.

[0186] [Experimental Example 4]

[0187] A lead wire and a battery were produced and evaluated under the same conditions as those in Experimental Example 1, except that the insulating resin film 15 consisted of only the first film layer 151 and the second film layer 152 was not provided.

[0188] When the obtained battery was subjected to the above evaluation, air was not discharged even when the pressure reached 0.5 MPa, and thus the evaluation was stopped at this pressure.

Claims

1. A lead for a non-aqueous electrolyte battery, comprising: a plate-like conductor, the upper and lower surfaces of which have rectangular shapes; a first insulating resin film disposed on the upper surface of the conductor; as well as a second insulating resin film disposed on the lower surface of the conductor, When the conductor is observed in a direction perpendicular to the upper surface, an axis along the selected two opposite sides is set as an X-axis, and an axis orthogonal to the X-axis is set as a Y-axis. The first insulating resin film and the second insulating resin film are configured to not cover both ends of the conductor along the Y axis but to cover the conductor along the X axis across the conductor at a portion other than the both ends of the conductor, and to overlap the first insulating resin film and the second insulating resin film when viewed in a vertical direction along the upper surface, At least one of the first insulating resin film and the second insulating resin film includes a first film layer and a second film layer in order from a position close to the conductor, The second film layer is arranged so as to expose a portion of the surface of the first film layer, and a type of resin of the second film layer is different from a type of resin of the first film layer.

2. The lead for a non-aqueous electrolyte battery according to claim 1, wherein The length of the second film layer along the X axis and the length of the second film layer along the Y axis are both shorter than the length of the first film layer along the X axis and the length of the first film layer along the Y axis. The first film layer and the second film layer are configured such that one side of the first film layer and one side of the second film layer are aligned in position on the Y axis.

3. The lead for a non-aqueous electrolyte battery according to claim 1, wherein A length obtained by subtracting a length of the second film layer along the Y axis from a length of the first film layer along the Y axis is greater than or equal to 0 mm and less than or equal to 1 mm, The length of the second film layer along the X-axis is shorter than the length of the first film layer along the X-axis, The first film layer and the second film layer are configured such that one side of the first film layer and one side of the second film layer are aligned in position on the Y axis.

4. The lead for a non-aqueous electrolyte battery according to claim 1, wherein The lengths of the sides of the second film layer at both ends of the Y axis are different. The first film layer and the second film layer are configured such that one side of the first film layer and one side of the second film layer are aligned in position on the Y axis.

5. The lead for a nonaqueous electrolyte battery according to any one of claims 1 to 4, wherein The first film layer includes at least one selected from polyolefin resin, polyester resin, polystyrene resin, and polyvinyl chloride resin as resin.

6. The lead for a nonaqueous electrolyte battery according to any one of claims 1 to 4, wherein The second film layer includes at least one selected from polyimide resin, polyester resin, and fluorine-based resin as resin.

Images