JP2012003919A - Laminate type cell and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate type cell that is improved in safety.SOLUTION: A laminate film 4 includes a seal part 41 and a resin gathering part 415. The seal part 41 includes two metal layers 411, and two resins 412 and 414. The resin 414 is formed between the metal layer 411 of a laminate film 4a and the metal layer 411 of a laminate film 4b in contact with the two metal layers 411. The resin gathering part 415 is provided in contact with the end of the resin 414 on the side of a power generation element 20. Then the resin gathering part 415 includes a cavity 4150.

Description

  The present invention relates to a laminated battery and a method for manufacturing the same.

  Conventionally, a laminated battery having a sealing process in which a plurality of internal electrode pairs are surrounded by a pair of upper and lower exterior materials, and the edges of each exterior material are thermally welded together to form a sealed space inside the exterior material A manufacturing method is known (Patent Document 1).

  And in a sealing process, after heat-welding the side near the sealed space of the edge part of an exterior material, the side far from sealed space is heat-welded.

JP 2006-40747 A

  However, when a laminated battery is manufactured using a conventional method for manufacturing a laminated battery, there is a problem that safety is lowered because there is no site to be cleaved even when the pressure in the sealed space is increased.

  Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to provide a laminated battery capable of improving safety.

  According to an embodiment of the present invention, a laminate type battery includes a power generation element and a laminate film. The power generation element includes a sheet-like positive electrode and a sheet-like negative electrode. The laminate film laminates the power generation element. The laminate film includes first and second seal portions and a resin reservoir portion. The second seal portion has a welding strength that is weaker than the welding strength of the first seal portion. The resin reservoir is provided in contact with the end of the second seal portion on the power generation element side and includes a cavity.

  In addition, according to the embodiment of the present invention, a method for manufacturing a laminated battery includes: a main surface of a first laminate film to be disposed on one side of a power generation element including a sheet-like positive electrode and a sheet-like negative electrode; A first step of applying a resin to one main surface of the second laminate film to be arranged on the other side of the element, and one main surface of the first laminate film and one main surface of the second laminate film. Of the second step of disposing the first and second laminate films on both sides of the power generation element so as to sandwich the power generation element, and the region serving as the seal portion of the first and second laminate films, it does not function as a cleavage vent A third step of welding the resin applied to the region to be the first seal portion, and after the third step, an electrolyte is injected through the region to be the second seal portion that functions as a cleavage vent. And a fourth step of wetting the resin applied to the region to be the second seal portion with the electrolyte, and a second step of welding the resin applied to the region to be the second seal portion after the fourth step. 5 steps.

  In the laminated battery according to the embodiment of the present invention, when the internal pressure of the laminate film increases, the pressure is applied to the resin reservoir, and interface peeling occurs from the resin reservoir. As a result, the second seal part is cleaved at a pressure lower than the pressure at which the first seal part cleaves.

  Therefore, the safety of the laminated battery can be improved.

  In the method for manufacturing a laminated battery according to the embodiment of the present invention, the second seal portion is formed by welding a resin whose surface is wetted with an electrolytic solution. As a result, the resin reservoir portion including the cavity is formed in contact with the end portion on the power generation element side of the second seal portion, and the second seal portion functions as a cleavage vent.

  Therefore, the safety of the laminated battery can be improved.

1 is a plan view of a laminated battery according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a laminated battery between line II and II shown in FIG. 1. FIG. 3 is an enlarged cross-sectional view of a part of the laminate film shown in FIG. 2. It is an expanded sectional view of the other part of the laminate film shown in FIG. FIG. 5 is an enlarged cross-sectional view of still another part of the laminate film shown in FIG. 2. FIG. 5 is an enlarged cross-sectional view of still another part of the laminate film shown in FIG. 2. It is a conceptual diagram when welding a laminate film. It is a conceptual diagram after welding of a laminate film. It is a figure for demonstrating the method to measure the breaking strength of a seal part. It is a figure which shows the relationship between breaking strength and the kind of seal part. It is a 1st process drawing which shows the manufacturing method of the laminated battery by embodiment of this invention. It is a 2nd process figure which shows the manufacturing method of the laminated battery by embodiment of this invention. It is a 3rd process figure which shows the manufacturing method of the laminated battery by embodiment of this invention. It is a 1st process drawing which shows the other manufacturing method of the laminated battery by embodiment of this invention. It is a 2nd process drawing which shows the other manufacturing method of the laminated battery by embodiment of this invention. It is a 3rd process drawing which shows the other manufacturing method of the laminated battery by embodiment of this invention. It is a 1st process figure which shows the further another manufacturing method of the laminated battery by embodiment of this invention. It is a 2nd process figure which shows the further another manufacturing method of the laminated battery by embodiment of this invention. It is a 3rd process figure which shows the further another manufacturing method of the laminated battery by embodiment of this invention. It is an enlarged view of the recessed part shown to the process (b-1) of FIG. It is sectional drawing of the area | region between the lines XXI-XXI shown in FIG. It is a top view which shows the other specific example of the accumulation part shown in FIG. 20 and FIG. It is a top view which shows the other specific example of the accumulation part shown in FIG. 20 and FIG. It is a top view which shows the other specific example of the accumulation part shown in FIG. 20 and FIG. It is a top view which shows the other specific example of the accumulation part shown in FIG. 20 and FIG. It is a figure which shows the other specific example of the cross-sectional shape of a reservoir part. It is the schematic of the motor vehicle provided with the laminated battery by embodiment of this invention.

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

  FIG. 1 is a plan view of a laminated battery according to an embodiment of the present invention. 2 is a cross-sectional view of the laminated battery taken along line II-II shown in FIG.

  Referring to FIGS. 1 and 2, a laminated battery 10 according to an embodiment of the present invention includes a sheet-like positive electrode 1, a sheet-like negative electrode 2, a separator 3, a laminate film 4, a positive electrode external terminal 5, A negative external terminal 6.

  The sheet-like positive electrode 1, the sheet-like negative electrode 2, and the separator 3 are laminated to constitute the power generation element 20. The sheet-like positive electrode 1 has a size smaller than that of the sheet-like negative electrode 2 in the in-plane direction DR1 of the laminated battery 10. The sheet-like negative electrode 2 has a size smaller than that of the separator 3 in the in-plane direction DR1.

  The sheet-like positive electrode 1, the sheet-like negative electrode 2, and the separator 3 are arranged such that both ends of the separator 3 are located outside the both ends of the sheet-like negative electrode 2 in the in-plane direction DR 1. It arrange | positions so that it may be located outside the both ends of 1.

  The laminate film 4 has a substantially rectangular planar shape and houses the power generation element 20. And the laminate film 4 has the seal part 40 in the edge. The seal portion 40 includes a seal portion 41 that functions as a cleavage vent and a seal portion 42 that does not function as a cleavage vent. The seal portion 41 is disposed along the sides other than the side from which the positive external terminal 5 and the negative external terminal 6 are drawn out of the four sides of the laminate film 4.

  The positive electrode external terminal 5 has a planar shape, and one end thereof is connected to the sheet-like positive electrode 1 directly or via a lead body 7. The other end of the positive electrode external terminal 5 is drawn outside through the laminate film 4.

  The negative external terminal 6 has a planar shape, and one end thereof is connected to the sheet-like negative electrode 2 directly or via a lead body. The other end of the negative electrode external terminal 6 is pulled out via the laminate film 4.

  In FIG. 1, the positive external terminal 5 and the negative external terminal 6 are drawn from the same side of the laminate film 4. However, in the embodiment of the present invention, the positive external terminal 5 and the positive external terminal 5 The negative external terminal 6 may be drawn out from different sides of the laminate film 4.

  The sheet-like positive electrode 1 has, for example, a structure in which a layer (positive electrode mixture layer) made of a positive electrode mixture containing a positive electrode active material, a conductive additive, a binder, and the like is formed on one side or both sides of a current collector.

For example, when the laminated battery 10 is a lithium ion secondary battery, the positive electrode active material is made of an active material that can occlude and release lithium ions. Such a positive electrode active material is, for example, a lithium-containing transition metal having a layered structure represented by Li _{1 + x} MO ₂ (−0.1 <x <0.1, M: Co, Ni, Mn, Al, Mg, etc.) Oxides, LiMn ₂ O ₄ , lithium manganese oxide having a spinel structure in which some of the elements are replaced with other elements, and olivine type compounds represented by LiMPO ₄ (M: Co, Ni, Mn, Fe, etc.) Consisting of either.

The lithium-containing transition metal oxide having a layered structure is, for example, LiCoO ₂ , LiNi _1-x Co _xy Al _y O ₂ (0.1 ≦ x ≦ 0.3, 0.01 ≦ y ≦ 0.2). And an oxide containing at least Co, Ni and Mn (LiMn _1/3 Ni _1/3 Co _1/3 O ₂ , LiMn _5/12 Ni _5/12 Co _1/6 O ₂ , LiNi _3/5 Mn _{1 / 5} Co _1/5 O ₂ ).

  The current collector of the positive electrode is made of, for example, an aluminum foil or an aluminum alloy foil. The thickness of the current collector varies depending on the size and capacity of the battery, but is, for example, 0.01 to 0.02 mm.

  The sheet-like positive electrode 1 is produced by the following method. A positive electrode mixture containing a positive electrode active material, a conductive additive such as graphite, acetylene black, carbon black, and fibrous carbon, and a binder such as polyvinylidene fluoride (PVDF) is mixed with N-methyl-2-pyrrolidone (NMP). ) Or the like to prepare a paste-like or slurry-like composition uniformly dispersed (the binder may be dissolved in the solvent). And this composition is apply | coated on a positive electrode electrical power collector, it dries, and the thickness of a positive mix layer is adjusted by press processing as needed. Thereby, the sheet-like positive electrode 1 is produced.

  In the embodiment of the present invention, the sheet-like positive electrode 1 may be produced using a method other than the method described above.

  The thickness of the positive electrode mixture layer in the sheet-like positive electrode 1 is preferably 30 to 100 μm per one side. Moreover, it is preferable that content of each structural component in a positive mix layer shall be positive electrode active material: 90-98 mass%, conductive support agent: 1-5 mass%, and binder: 1-5 mass%.

  The positive electrode external terminal 5 is preferably made of aluminum or an aluminum alloy from the viewpoint of easy connection with the equipment used.

  The thickness of the positive external terminal 5 is preferably 50 to 300 μm. That is, by setting the thickness of the positive external terminal 5 to 50 μm or more, the positive external terminal 5 can be prevented from being cut during welding of the positive external terminal 5, and the positive external terminal 5 is torn by pulling and bending. Can be prevented. Moreover, by setting the thickness of the positive electrode external terminal 5 to 300 μm or less, it is possible to prevent a gap in the thickness direction from occurring in the seal portion 40 of the laminate film 4.

  In addition, in order to increase the adhesive strength between the laminate film 4 and the positive electrode external terminal 5, a resin adhesive layer (for example, a laminate film) is preliminarily provided at a location where the positive electrode external terminal 5 is supposed to be positioned on the seal portion 40. 4 may be provided with an adhesive layer made of the same kind of resin as the resin constituting the heat-sealing resin layer of the metal laminate film constituting 4.

  Examples of the method of connecting the current collector in the sheet-like positive electrode 1 or the aluminum lead body 7 connected to the current collector and the positive external terminal 5 include resistance welding, ultrasonic welding, laser welding, caulking, and Various methods such as a method using a conductive adhesive can be employed. Of these, ultrasonic welding is particularly suitable.

  For example, when the laminated battery 10 is a lithium ion secondary battery, the sheet-like negative electrode 2 includes an active material that can occlude and release lithium ions. Such negative electrode active materials occlude and release lithium ions such as graphite, pyrolytic carbons, cokes, glassy carbons, fired organic polymer compounds, mesocarbon microbeads (MCMB), and carbon fibers. It consists of one or a mixture of two or more possible carbon-based materials.

Other negative electrode active materials include, for example, elements such as Si, Sn, Ge, Bi, Sb, and In, alloys of Si, Sn, Ge, Bi, Sb, and In, lithium-containing nitrides, and lithium oxides. It consists of a compound (LiTi ₃ O ₁₂ or the like) that can be charged and discharged at a low voltage close to lithium metal, lithium metal, and a lithium / aluminum alloy.

  These negative electrode active materials include a conductive additive (made of the same material as the positive electrode conductive additive), a binder (a binder of PVDF, rubber binder such as styrene butadiene rubber (SBR) and carboxymethyl cellulose (CMC), etc. ) Is added as appropriate to the negative electrode mixture, and the current collector is a finished product (negative electrode mixture layer) using the current collector as a core material, or the above-described various alloys or lithium metal foils. Those laminated on the surface are used as the sheet-like negative electrode 2.

  And the sheet-like negative electrode 2 is produced by the following method. A paste in which a negative electrode mixture containing the above-described negative electrode active material, a binder, and, if necessary, a conductive additive such as graphite, acetylene black, and carbon black is uniformly dispersed using a solvent such as NMP. Alternatively, a slurry-like composition is prepared (the binder may be dissolved in a solvent). And this composition is apply | coated on a negative electrode electrical power collector, it dries, and the thickness or density of a negative mix layer is adjusted by press processing as needed. Thereby, the sheet-like negative electrode 2 is produced.

  In the embodiment of the present invention, the sheet-like negative electrode 2 may be produced using a method other than the method described above.

  As the current collector for the negative electrode, a copper foil is suitable. And although the thickness of an electrical power collector is based on the magnitude | size or capacity | capacitance of a battery, it is preferable that it is 0.02-0.05 mm, for example.

  The thickness of the negative electrode mixture layer in the sheet-like negative electrode 2 is preferably 30 to 100 μm per side. Moreover, it is preferable that content of each structural component in a negative mix layer is 90-98 mass% of negative electrode active materials, and 1-5 mass% of binders. Moreover, when using a conductive support agent for a negative electrode, it is preferable that content of the conductive support agent in a negative mix layer is 1-5 mass%.

  The negative external terminal 6 is made of a metal foil or ribbon such as nickel, nickel-plated copper, and nickel-copper clad. Further, the thickness of the negative electrode external terminal 6 is preferably 50 to 300 μm like the positive electrode external terminal 5.

  That is, by setting the thickness of the negative electrode external terminal 6 to 50 μm or more, the negative electrode external terminal 6 can be prevented from being cut during welding of the negative electrode external terminal 6, and the negative electrode external terminal 6 is broken by pulling and bending. Can be prevented. In addition, by setting the thickness of the negative electrode external terminal 6 to 300 μm or less, it is possible to prevent a gap in the thickness direction from occurring in the seal portion 40 of the laminate film 4.

  In addition, in order to increase the adhesive strength between the laminate film 4 and the negative electrode external terminal 6, a resin adhesive layer (for example, a laminate film) is preliminarily provided at a location where the negative electrode external terminal 6 is supposed to be positioned on the seal portion 40. 4 may be provided with an adhesive layer made of the same kind of resin as the resin constituting the heat-sealing resin layer of the metal laminate film constituting 4.

  The connection between the sheet-like negative electrode 2 and the negative electrode external terminal 6 may be performed by directly connecting the current collector of the sheet-like negative electrode 2 and the negative electrode external terminal 6, for example, via a copper lead body It may be done. The thickness of the copper lead body is preferably 50 to 300 μm, similarly to the negative electrode external terminal 6. Such a lead body is particularly preferably used when the copper foil as the negative electrode current collector is thin and the strength is insufficient for direct connection to the negative electrode external terminal 6.

  The connection between the current collector in the sheet-like negative electrode 2 or the copper lead body connected to the current collector and the negative electrode external terminal 6 is, for example, by resistance welding, ultrasonic welding, laser welding, caulking, and conductive adhesive. It is performed by various methods such as a method. Among these methods, ultrasonic welding is particularly suitable.

  The separator 3 is made of, for example, a porous film or a nonwoven fabric made of polyethylene, polypropylene, a fusion of polyethylene and polypropylene, polyethylene terephthalate, polybutylene terephthalate, or the like.

  The thickness of the separator 3 is preferably 10 to 50 μm, and the porosity is preferably 30 to 70%.

  Moreover, the effect which prevents a short circuit can be improved and the reliability of a battery can be improved more by using several separators, such as overlapping a porous film and a nonwoven fabric.

When the laminate battery 10 is a lithium ion secondary battery, the electrolyte used for the laminate battery 10 is, for example, a solution (non-aqueous solution) in which a solute such as LiPF ₆ or LiBF ₄ is dissolved in a high dielectric constant solvent or an organic solvent. Electrolyte). As the high dielectric constant solvent, ethylene carbonate (EC), propylene carbonate (PC), γ-butyrolactone (BL), or the like can be used. The organic solvent is composed of a low-viscosity solvent such as linear dimethyl carbonate (DMC), diethyl carbonate (DEC), and methyl ethyl carbonate (EMC).

  In addition, it is preferable to use the mixed solvent of the high dielectric constant solvent mentioned above and a low-viscosity solvent as electrolyte solution solvent. Alternatively, PVDF, a rubber-based material, an alicyclic epoxy, a material having an oxetane-based three-dimensional crosslinked structure, and the like may be mixed and solidified into the above-described solution to form a polymer electrolyte.

  FIG. 3 is an enlarged cross-sectional view of a part of the laminate film 4 shown in FIG. Note that the enlarged sectional view shown in FIG. 3 is a partial enlarged sectional view including the sealing portion 41 of the laminate film 4.

  With reference to FIG. 3, the laminate film 4 includes a laminate film 4a disposed on the upper side and a laminate film 4b disposed on the lower side. Each of the laminate films 4a and 4b includes a metal layer 411 and resins 412 and 413.

  The metal layer 411 is made of, for example, an aluminum film or a stainless steel film. And the thickness of the metal layer 411 is 10-150 micrometers, for example.

  The resin 412 is formed on the outer surface of the metal layer 411 of the laminate film 4a or the laminate film 4b. The resin 412 is a resin for an electrolytic solution. The resin 412 is made of, for example, any one of a nylon film (such as nylon 66 film) and a polyester film (such as PET film). The resin 412 has a thickness of 20 to 100 μm.

  The resin 413 is formed on the inner surface of the metal layer 411 of the laminate film 4a or the laminate film 4b, and has a thickness of 20 to 100 μm, for example. The resin 413 is made of, for example, a modified polyolefin film (modified polyolefin ionomer film). The resin 413 functions as a heat welding resin.

  The laminate film 4 has a seal part 41 and a resin reservoir part 415. The seal portion 41 has a width W in the in-plane direction DR1. The width W is 10 mm, for example.

  The seal portion 41 includes two metal layers 411, two resins 412, and a resin 414. The resin 414 is formed as a result of welding the resin 413 of the laminate film 4a and the resin 413 of the laminate film 4b.

  The resin reservoir portion 415 is provided in contact with the end portion of the seal portion 41 on the power generation element 20 side. More specifically, the resin reservoir portion 415 is provided in contact with the end portion of the resin 414 included in the seal portion 41 on the power generation element 20 side.

  The resin reservoir 415 has a cross-sectional shape protruding toward the power generation element 20 and includes a cavity 4150. Further, the interface between the resin 413 and the resin reservoir 415 of the laminate film 4a and the interface between the resin 413 and the resin reservoir 415 of the laminate film 4b are pointed in the direction from the power generation element 20 to the outside in the in-plane direction DR1. It consists of a cross-sectional shape.

  FIG. 4 is an enlarged cross-sectional view of another part of the laminate film 4 shown in FIG. Note that the enlarged cross-sectional view shown in FIG. 4 is also a partial enlarged cross-sectional view including the seal portion 41 of the laminate film 4.

  Referring to FIG. 4, the configuration other than resin reservoir 416 of laminate film 4 is the same as the configuration other than resin reservoir 415 of laminate film 4 shown in FIG. 3.

  The laminate film 4 has a seal part 41 and a resin reservoir part 416. The resin reservoir portion 416 is provided in contact with the end portion of the seal portion 41 on the power generation element 20 side. More specifically, the resin reservoir portion 416 is provided in contact with the end portion of the resin 414 included in the seal portion 41 on the power generation element 20 side. The resin reservoir 416 includes a cavity 4160. The resin reservoir 416 has a cross-sectional shape that is curved so that the resin 413 on the laminate film 4 a side forms a cavity 4160.

  FIG. 5 is an enlarged cross-sectional view of still another part of the laminate film 4 shown in FIG. Note that the enlarged sectional view shown in FIG. 5 is a partial enlarged sectional view including the seal portion 42 of the laminate film 4.

  Referring to FIG. 5, the configuration other than seal portion 42 and resin reservoir portion 418 of laminate film 4 is the same as the configuration other than seal portion 41 and resin reservoir portion 415 of laminate film 4 shown in FIG. 3.

  The laminate film 4 includes a seal portion 42 and a resin reservoir portion 418. The seal portion 42 has a width W in the in-plane direction DR1.

  The seal part 42 includes two metal layers 411, two resins 412, and a resin 417. The resin 417 is formed as a result of welding the resin 413 of the laminate film 4a and the resin 413 of the laminate film 4b.

  The resin reservoir 418 is provided in contact with the end of the seal portion 42 on the power generation element 20 side. More specifically, the resin reservoir 418 is provided in contact with the end of the resin 417 included in the seal portion 42 on the power generation element 20 side.

  The end of the resin reservoir 418 on the power generation element 20 side includes a protrusion 4181 and depressions 4182 and 4183. The protrusion 4181 protrudes in an arc shape toward the power generation element 20 side. The recessed portion 4182 is provided continuously to the protruding portion 4181 on one side of the protruding portion 4181 in the thickness direction of the seal portion 42, and is recessed in an arc shape in a direction opposite to the protruding direction of the protruding portion 4181. The recess 4183 is provided continuously to the protrusion 4181 on the other side of the protrusion 4181 in the thickness direction of the seal portion 42, and is recessed in an arc shape in a direction opposite to the protrusion direction of the protrusion 4181.

  When the pressure in the space on the power generation element 20 side rises, a force is applied to the resin reservoir 418 along the direction from the power generation element 20 to the outside in the in-plane direction DR1.

  In this case, the resin reservoir 418 has a protrusion 4181 and recesses 4182 and 4183, and since the protrusion 4181 and the recesses 4182 and 4183 have an arcuate cross-sectional shape, the resin reservoir 418 is applied to the resin reservoir 418. The force is dispersed by the protrusion 4181 and the depressions 4182 and 4183 having an arcuate cross-sectional shape.

  Accordingly, breakage from the resin reservoir 418 is prevented. As a result, the welding strength of the seal portion 42 is improved.

  FIG. 6 is an enlarged cross-sectional view of still another part of the laminate film 4 shown in FIG. The enlarged sectional view shown in FIG. 6 is an enlarged sectional view of the seal portion 42 including the positive electrode external terminal 5 or the negative electrode external terminal 6.

  Referring to FIG. 6, the configuration other than seal portion 42 and resin reservoir portion 418 of laminate film 4 is the same as the configuration other than seal portion 41 and resin reservoir portion 415 of laminate film 4 shown in FIG. 3.

  The seal part 42 includes a resin 417, and the resin 417 is disposed on both sides of the positive external terminal 5 and the negative external terminal 6 in the thickness direction of the seal part 42.

  The resin reservoir 418 is in contact with the end of the resin 417 on the power generation element 20 side, and is disposed on both sides of the positive external terminal 5 and the negative external terminal 6 in the thickness direction of the seal portion 42. More specifically, the protrusions 4181 of the resin reservoir 418 are disposed on both sides of the positive electrode external terminal 5 and the negative electrode external terminal 6 in the thickness direction of the seal portion 42.

  As a result, the end portion on the power generation element 20 side of the resin reservoir 418 has a shape curved in an arc shape on both sides of the positive electrode external terminal 5 and the negative electrode external terminal 6 in the thickness direction of the seal portion 42.

  Therefore, even if the positive electrode external terminal 5 and the negative electrode external terminal 6 exist, the mechanism described in FIG. 5 prevents the resin reservoir portion 418 from being broken, and the welding strength of the seal portion 42 is improved.

  FIG. 7 is a conceptual diagram when a laminated film is welded. Referring to FIG. 7, laminate films 4a and 4b are overlapped so that resin 413 of laminate film 4a is in contact with resin 413 of laminate film 4b.

  And the resin 413 of the laminate film 4a is welded to the resin 413 of the laminate film 4b by sandwiching the outer periphery of the two laminated laminate films 4a and 4b with the two seal bars (heaters) 50 and 60. In this case, the heating temperature of the seal bar (heater) 50 is, for example, 170 ° C. to 200 ° C., and the heating temperature of the seal bar (heater) 60 is, for example, 170 ° C. to 210 ° C. The pressure is, for example, 0.3 MPa to 0.5 MPa, and the press time is, for example, 5 seconds to 15 seconds.

  FIG. 8 is a conceptual diagram after welding of the laminate films 4a and 4b. (A), (c), and (d) of FIG. 8 seal the peripheral portion of the laminate film 4 after the resin applied to the region to be the seal portion of the two laminate films 4a and 4b is wetted by the electrolytic solution. FIG. 8 (b) is a conceptual diagram of the two laminated films 4a and 4b, and the peripheral portion of the laminated film 4 is sealed without wetting the resin applied to the region to be the sealed portion of the two laminated films 4a and 4b with the electrolyte. It is a conceptual diagram when doing.

  Referring to FIG. 8, the heating temperature of seal bar (heater) 50 is 200 ° C., the heating temperature of seal bar (heater) 60 is 200 ° C., the pressing pressure is 0.3 MPa, and the pressing time is 5 When the time is seconds, a welded portion in which a cavity exists in the welded resin is obtained (see pattern A, FIG. 8A).

  When the heating temperature of the seal bar (heater) 50 is 190 ° C., the heating temperature of the seal bar (heater) 60 is 210 ° C., the press pressure is 0.5 MPa, and the press time is 15 seconds, A welded portion in which the space-side end of the welded resin is curved in an arc shape is obtained (see pattern B, FIG. 8B).

  Furthermore, when the heating temperature of the seal bar (heater) 50 is 180 ° C., the heating temperature of the seal bar (heater) 60 is 190 ° C., the press pressure is 0.3 MPa, and the press time is 5 seconds, A welded portion is obtained in which the space-side end portion of the welded resin protrudes from the space side to the resin side (see pattern C, FIG. 8C).

  Furthermore, when the heating temperature of the seal bar (heater) 50 is 170 ° C., the heating temperature of the seal bar (heater) 60 is 180 ° C., the press pressure is 0.3 MPa, and the press time is 5 seconds, A welded portion in contact with the elongated space of the welded resin is obtained (see pattern D, FIG. 8D).

  Thus, by changing the welding conditions (heating temperature of the seal bars 50, 60, press pressure, and press time) when the laminate film 4 is welded, welded portions having different patterns A, B, C, and D are obtained. It is done.

  FIG. 9 is a diagram for explaining a method of measuring the breaking strength of the seal portion. With reference to FIG. 9, the peripheral part of the laminate film 4 is sealed, and the seal part 40 is created (see (a) of FIG. 9). In this case, when the peripheral portion of the laminate film 4 is sealed after the resin is wetted with the electrolytic solution, the resin applied to the region to be the seal portion 40 is wetted with the electrolytic solution.

  And the area | regions 401-403 of the laminated film 4 sealed are cut out (refer FIG.9 (b)). Thus, test pieces 31 to 33 are produced (see (c) of FIG. 9). Each of the test pieces 31 to 33 has a length of 30 mm and a width of 15 mm.

  Thereafter, for example, the test piece 31 is taken out from the test pieces 31 to 33 (see FIG. 9D), and two unsealed laminate films are opened. Thus, the test piece 31 includes the film portions 311 and 312 and the seal portion 313 (see (e) of FIG. 9).

  Then, the film portion 311 is pulled in the direction of arrow 11, the film portion 312 is pulled in the direction of arrow 12, and the force when the seal portion 313 breaks is measured as the breaking strength.

  FIG. 10 is a diagram illustrating the relationship between the breaking strength and the type of the seal portion. In FIG. 10, the vertical axis represents the breaking strength, and the horizontal axis represents the type of the seal portion. Moreover, the horizontal bar in FIG. 10 shows the average value of breaking strength. Furthermore, in FIG. 10, “15 mm” included in the unit of breaking strength means that the breaking strength on the vertical axis is the breaking strength of a film having a width of 15 mm.

  Referring to FIG. 10, the types of welded portions are the patterns A, B, C, and D described in FIG. And breaking strength becomes weak in order of pattern B, pattern C, pattern D, and pattern A.

  Thus, the welded portion (pattern A) including the cavity has the weakest weld strength, and the welded portion (pattern B) in which the end on the power generation element 20 side is curved in an arc shape has the strongest weld strength. Have

  Therefore, in the embodiment of the present invention, the welded portion made of the pattern A is applied to the seal portion 41, and the welded portion made of the pattern B is applied to the seal portion 42. Therefore, the seal portion 41 has a welding strength that is weaker than the welding strength of the seal portion 42.

  As described above, in the laminated battery 10, the resin reservoir 415 including the cavity 4150 or the resin reservoir 416 including the cavity 4160 is provided in contact with the end of the seal portion 41 on the power generation element 20 side, and has an arc shape. A resin reservoir 418 having a curved end is provided in contact with the end of the seal portion 42 on the power generation element 20 side.

  Therefore, when the pressure in the space in the laminate films 4a and 4b rises, the interface separation does not occur from the resin reservoir portion 418, and the interface separation occurs from the resin reservoir portion 415 (or the resin reservoir portion 416). As a result, the seal portion 41 is cleaved at a pressure lower than the pressure at which the seal portion 42 is cleaved.

Therefore, the safety of the laminated battery 10 can be improved.
There are the following three methods for accommodating the power generation element 20 in the laminate film 4. (1) A method in which the power generation element 20 is sandwiched between two laminated films, and then the outer periphery of these two laminated films is heat-sealed leaving one side for injecting an electrolyte solution (2) Laminated film A method of inserting the power generation element 20 from one side for injecting the electrolyte into a laminate film previously formed into a bag shape, leaving one side for injecting the electrolyte out of the outer periphery of the battery (3) Power generation on the laminate film A method in which the element 20 is placed, the laminate film is folded in two so as to wrap the power generation element 20, and the remaining outer periphery is heat-sealed leaving one side for injecting the electrolyte solution. (The folded part that is folded may be heat-sealed or not heat-sealed)

  11 to 13 are first to third process diagrams showing a method for manufacturing laminated battery 10 according to the embodiment of the present invention.

  In addition, in the process shown in FIGS. 11-13, the electric power generation element 20 shall be accommodated in the laminate film 4 using the method of (3) mentioned above. Step (a) to step (c) are cross-sectional views, and step (d) to step (i) are plan views.

  Referring to FIG. 11, when production of laminated battery 10 is started, sheet-like positive electrode 1 and sheet-like negative electrode 2 are produced by the method described above. And the separator 3, the positive electrode external terminal 5, and the negative electrode external terminal 6 are produced. Thereafter, the positive electrode external terminal 5 is connected to the sheet-like positive electrode 1 and the negative electrode external terminal 6 is connected to the sheet-like negative electrode 2 by the method described above.

  If it does so, the sheet-like positive electrode 1 and the sheet-like negative electrode 2 will be laminated | stacked via the separator 3, and the electric power generation element 20 will be produced (refer process (a)).

  Thereafter, the resin 412 is applied to one surface of the metal layer 411, and the resin 413 is applied to the other surface of the metal layer 411 to produce the laminate film 4 (see step (b)).

  Then, the power generation element 20 is placed on the laminate film 4 so as to be in contact with the resin 413 of the laminate film 4, and the laminate film 4 is folded in two (see step (c)). In this case, the positive electrode external terminal 5 and the negative electrode external terminal 6 are exposed from the laminate film 4 that is partially folded.

  After the step (c), the region 52 to be the seal portion 42 other than the region 51 to be the seal portion 41 in the laminate film 4 is sealed using the seal bars 50 and 60 (see step (d)). In this case, the region 52 includes regions 521 and 522 along the side 4B of the laminate film 4, a region 523 along the side 4A of the laminate film 4, and a region 524 along the side 4D of the laminate film 4. The heating temperature of the seal bar (heater) 50 is set to 190 ° C., the heating temperature of the seal bar (heater) 60 is set to 210 ° C., the press pressure is set to 0.5 MPa, and the press time is set to 15 seconds. The regions 521, 522, 523, and 524 are sequentially sealed using the set welding conditions. Thereby, the region 52 is sealed.

  Note that the side 4C of the laminate film 4 is a folded portion obtained by folding the laminate film 4 in half, and may or may not be sealed. When sealing a folded portion that is folded in half, the folded portion that is folded in half is sealed using the same conditions as when the regions 521, 522, 523, and 524 are sealed.

  The regions 521 and 522 have a width of 20 mm, for example, and the regions 523 and 524 have a width of 10 mm, for example.

  Referring to FIG. 12, after the step (d), an electrolytic solution is injected from the region 51 along the side 4B of the laminate film 4 (see step (e)).

  And the area | region 511 of the area | region 51 is sealed using the seal bars 50 and 60, and the area | region 512 is not sealed, drawing the inside of the laminate film 4 from the area | region 51 which inject | poured electrolyte solution into vacuum (refer process (f)). .

  In this case, each of the regions 511 and 512 has a width of 10 mm, for example.

  Referring to FIG. 13, after step (f), laminate film 4 is held for a certain period of time (for example, 5 seconds) with region 51 facing down (see step (g)). As a result, the surface of the resin 413 applied to the region 512 is wetted by the electrolyte injected into the laminate film 4.

  Thereafter, a part of the laminate film 4 is cut along the boundary between the region 511 and the region 512, and the resin applied to the region 512 is sealed by the seal bars 50 and 60 (see step (h)). In this case, the heating temperature of the seal bars (heaters) 50 and 60 was set to 200 ° C., the pressing pressure was set to 0.3 MPa, and the coating was applied to the region 512 using the welding conditions in which the pressing time was set to 5 seconds. Seal the resin. Thus, the seal portion 41 is formed, and the resin reservoir portion 415 (or the resin reservoir portion 416) including the cavity 4150 (or the cavity 4160) is formed in contact with the end of the seal portion 41 on the power generation element 20 side, Laminated battery 10 is completed (see step (i)).

  In addition, also when accommodating the electric power generation element 20 in the laminate film 4 using the method of (1) and (2) mentioned above, it laminates using the process (a)-process (i) shown in FIGS. The battery 10 is manufactured.

  In the step (h) shown in FIG. 13, after the resin 413 applied to the region 512 of the laminate film 4 is wetted with the electrolytic solution, the seal bars 50 and 60 sandwich the region 512 of the laminate film 4 to thereby seal the seal portion 41. The region 512 to be sealed is sealed.

  As a result, the resin 413 of the laminate films 4a and 4b is welded by the seal bars 50 and 60 to form the resin 414, and the resin reservoir 415 (or the resin reservoir 416) is formed.

  As described above, the region 512 to be the seal portion 41 is sealed in a state where the electrolytic solution is present.

  Therefore, when the pressure in the laminate film 4 is increased, interface peeling occurs from the resin reservoir 415 (or resin reservoir 416) of the seal portion 41, and the seal portion 41 is cleaved. Therefore, the safety of the laminate battery 10 is improved. Can be improved.

  Note that the step (b) shown in FIG. 11 is performed on one main surface of the first laminate film to be disposed on one side of the power generation element 20 including the sheet-like positive electrode 1 and the sheet-like negative electrode 2 and on the other side of the power generation element 20. This corresponds to the step of applying a resin to one main surface of the second laminate film to be arranged.

  Further, in the step (c) shown in FIG. 11, the first and second laminate films generate power so that the power generation element 20 is sandwiched between one main surface of the first laminate film and one main surface of the second laminate film. This corresponds to the step of arranging the elements 20 on both sides.

  Further, in the step (d) shown in FIG. 11, the resin applied to the region to be the first seal portion that does not function as the cleavage vent among the regions to be the seal portions of the first and second laminate films is welded. It corresponds to a process.

  Further, in the steps (e), (f) shown in FIG. 12 and the step (g) shown in FIG. 13, the electrolyte is injected through the region serving as the second seal portion functioning as the cleavage vent, and the second This corresponds to the step of wetting the resin applied to the region to be the seal portion with the electrolytic solution.

  FIGS. 14 to 16 are first to third process diagrams showing another method for manufacturing laminated battery 10 according to the embodiment of the present invention.

  Steps (a), (b), (c), (d-1), (e-1), (f-1), and (g-1) shown in FIGS. Steps (a) to (i) shown in Steps (d) to (i) are replaced with Steps (d-1), (e-1), (f-1), and (g-1). The others are the same as those in the steps (a) to (i).

  Steps (d-1), (e-1), (f-1), and (g-1) are plan views.

  Referring to FIG. 14, after step (c) described above, regions 52 that become seal portions 42 other than region 51 that becomes seal portion 41 of laminate film 4 are sealed using seal bars 50 and 60 (see FIG. 14). Step (d-1)). In this case, the region 52 includes regions 521A and 522A along the side 4B of the laminate film 4, a region 523 along the side 4A of the laminate film 4, and a region 524 along the side 4D of the laminate film 4. The heating temperature of the seal bar (heater) 50 is set to 190 ° C., the heating temperature of the seal bar (heater) 60 is set to 210 ° C., the press pressure is set to 0.5 MPa, and the press time is set to 15 seconds. The regions 521A, 522A, 523, and 524 are sequentially sealed using the set welding conditions. Thereby, the region 52 is sealed. Further, the side 4C of the laminate film 4 may be sealed as described above, or may not be sealed. Further, each of the regions 521A and 522A has a width of 10 mm, like the regions 523 and 524.

  Referring to FIG. 15, after step (d-1), the electrolytic solution is injected from region 51 along side 4 </ b> B of laminate film 4, and the electrolytic solution is supplied to the surface of the resin applied to region 51. (Refer process (e-1)).

  In this case, as a method of supplying the electrolytic solution to the surface of the resin applied to the region 51, for example, the tip of a nozzle for injecting the electrolytic solution into the laminate film 4 is arranged in the region 51, and the electrolytic solution is supplied A method of supplying the surface of the resin applied to 51 and a method of immersing the tip of a cotton swab in the electrolytic solution and applying the electrolytic solution to the surface of the resin applied to the region 51 with the cotton swab are assumed.

  After the step (e-1), the region 51 is sealed by the seal bars 50 and 60 using the same welding conditions as the above-described region 512 (see step (f-1)).

  Thus, the seal portion 41 is formed, and the resin reservoir portion 415 (or the resin reservoir portion 416) including the cavity 4150 (or the cavity 4160) is formed in contact with the end of the seal portion 41 on the power generation element 20 side, Laminated battery 10 is completed (see step (g-1)).

  When the laminated battery 10 is manufactured according to the steps (a), (b), (c), (d-1), (e-1), (f-1), (g-1), the step (a) While the three steps (e) to (g) in (i) can be realized by one step (e-1), the step of cutting a part of the laminate film 4 can be eliminated.

  Therefore, the laminated battery 10 can be manufactured with a reduced number of steps.

  In addition, also when accommodating the electric power generation element 20 in the laminate film 4 using the method of (1) and (2) mentioned above, process (a), (b), (c), shown in FIGS. Laminated battery 10 is manufactured using (d-1), (e-1), (f-1), and (g-1).

  Moreover, a process (d-1) is the process of welding resin apply | coated to the area | region used as the 1st seal part which does not function as a cleavage vent among the area | region used as the seal part of a 1st and 2nd laminate film. Equivalent to.

  Further, in the step (e-1), the electrolytic solution is injected through the region serving as the second seal portion functioning as the cleavage vent, and the resin applied to the region serving as the second seal portion is used by the electrolytic solution. This corresponds to the wetting step.

  FIGS. 17 to 19 are first to third process diagrams showing still another method of manufacturing the laminated battery 10 according to the embodiment of the present invention.

  Steps (a), (b), (b-1), (c), (d-1), (e-1), (f-1), and (g-1) shown in FIGS. 14 to 16, steps (a), (b), (c), (d-1), (e-1), (f-1), and (g-1) steps (b) and Step (b-1) is added between step (c) and others are steps (a), (b), (c), (d-1), (e-1), ( The same as f-1) and (g-1). Step (b-1) is a plan view.

  Referring to FIG. 17, after step (b) described above, reservoir portion 510 is formed in resin 413 applied to region 51 (51a) that becomes seal portion 41 of laminate film 4a (step (b-1)). reference). The reservoir portion 510 functions to store the electrolyte solution.

  And the process (c) mentioned above is performed. In this case, the power generation element 20 is disposed on the laminate film 4a so as to be in contact with the resin 413 of the laminate film 4a, and the laminate film 4b is folded in half by the center line 4X of the laminate film 4. Thereby, the region 51 (51b) of the laminate film 4b is overlapped with the region 51 (51a) of the laminate film 4a.

  Thereafter, the steps (d-1), (e-1), (f-1), and (g-1) described above are executed, and the laminated battery 10 is completed.

  In this case, when the electrolytic solution is supplied to the surface of the resin in the region 51 in the step (e-1), the electrolytic solution is accumulated in the reservoir 510. And the area | region 51 used as the seal | sticker part 41 is sealed in the state in which the electrolyte solution collected in the process (f-1). As a result, the above-described resin reservoir 415 (or resin reservoir 416) can be easily manufactured.

  In addition, also when accommodating the electric power generation element 20 in the laminate film 4 using the method of (1), (2) mentioned above, process (a), (b), (b-1) shown in FIGS. ), (C), (d-1), (e-1), (f-1), and (g-1) are used to manufacture a laminated battery 10.

  FIG. 20 is an enlarged view of the reservoir 510 shown in the step (b-1) of FIG. Referring to FIG. 20, the reservoir 510 is formed closer to the power generation element 20 than the central portion in the width direction of the region 51 that becomes the seal portion 41.

  The reservoir portion 510 has a structure in which, for example, a plurality of concave portions 5101 having a diamond shape in a plan view are arranged in a substantially trapezoidal shape. In the concave portion 5101, the length of the rhombus diagonal is, for example, 500 μm.

  Concave portion 5101 is linearly arranged in width direction DR2 and length direction DR3 of region 51. And the number of the recessed parts 5101 in the length direction DR3 increases as the power generating element 20 is approached.

  The plurality of recesses 5101 has a ratio of the area occupied by the plurality of recesses 5101 to the area of the region where the plurality of recesses 5101 are not formed in a trapezoidal region where the plurality of recesses 5101 are arranged. 1 is formed.

When the width of the region 51 is 10 mm, the length of the region 51 is 20 mm (= upper and lower sides of the trapezoid), and the lower base of the trapezoid is 10 mm, the area of the trapezoid in which the plurality of recesses 5101 are arranged is ((20 + 10 ) × 5) / 2 = 75 mm ² . As a result, the total area of the plurality of recesses 5101 is 75/2 = 37.5 mm ² .

In the embodiment of the present invention, the total area of the plurality of recesses 5101 is not limited to 37.5 mm ^2, it is sufficient 37.5 mm ² or more.

  FIG. 21 is a cross-sectional view of region 51 taken along line XXI-XXI shown in FIG. Referring to FIG. 21, the recess 5101 is formed in the resin 413 and has, for example, a substantially triangular cross-sectional shape. The recess 5101 has a depth corresponding to, for example, a depth of 330 μm or 80% of the thickness of the resin 413.

  The plurality of recesses 5101 are applied to the region 513 disposed on the power generation element 20 side with respect to the central portion in the width direction DR2, for example, using a mold in which a plurality of protrusions made of a quadrangular pyramid are disposed in a substantially trapezoidal shape. It is formed by pressing the molded resin.

  22 to 25 are plan views showing other specific examples of the reservoir 510 shown in FIGS. 20 and 21. FIG.

  Referring to FIG. 22, reservoir 510 may have a structure in which a plurality of recesses 5101A are arranged in a substantially trapezoidal shape instead of a plurality of recesses 5101 (see FIG. 22A). Each of the plurality of recesses 5101A has a circular planar shape, and has a diameter of 500 μm, for example. Others are the same as the plurality of recesses 5101.

  Further, the reservoir 510 may have a structure in which a plurality of recesses 5101B are arranged in a substantially trapezoidal shape instead of the plurality of recesses 5101 (see FIG. 22B). Each of the plurality of recesses 5101B has an elliptical planar shape, and has, for example, a major axis of 500 μm and a minor axis of 300 μm. Each of the plurality of recesses 5101 </ b> B is arranged so that the major axis is along the width direction DR <b> 2 of the region 51. Others are the same as the plurality of recesses 5101.

  Furthermore, the reservoir portion 510 may have a structure in which a plurality of recesses 5101C are arranged in a substantially trapezoidal shape instead of the plurality of recesses 5101 (see FIG. 23A). Each of the plurality of recesses 5101C has a rectangular planar shape, and has, for example, a long side of 500 μm and a short side of 200 μm. Each of the plurality of recesses 5101 </ b> C is arranged so that the long side is along the width direction DR <b> 2 of the region 51. Others are the same as the plurality of recesses 5101.

  Furthermore, the reservoir portion 510 may have a structure in which a plurality of recesses 5101D are arranged in a substantially trapezoidal shape instead of the plurality of recesses 5101 (see FIG. 23B). Each of the plurality of recesses 5101D has a rectangular planar shape, and has, for example, a long side of 500 μm and a short side of 200 μm. Each of the plurality of recesses 5101D is arranged such that the long side is along the length direction DR3 of the region 51. Others are the same as the plurality of recesses 5101.

  Further, the reservoir 510 may have a structure in which a plurality of recesses 5101E are arranged in a substantially trapezoidal shape instead of the plurality of recesses 5101 (see FIG. 24A). Each of the plurality of recesses 5101E has a square planar shape, and has a side length of 500 μm, for example. Others are the same as the plurality of recesses 5101.

  Furthermore, the reservoir portion 510 may have a structure in which a plurality of recesses 5101F are arranged in a substantially trapezoidal shape instead of the plurality of recesses 5101 (see FIG. 24B). Each of the plurality of recesses 5101F includes recesses 5102 and 5103. The recess 5102 has an elliptical planar shape, and the recess 5103 has a groove shape. The recess 5103 guides the electrolytic solution from the power generation element 20 side to the recess 5102.

  The major axis of the recess 5102 is in the range of 500 μm, and the minor axis of the recess 5102 is 300 μm. The recess 5103 has a length of 500 μm and a width of 200 μm.

One end of the recess 5103 is connected to one end of the recess 5102. The recesses 5102 and 5103 are arranged such that the major axis of the recess 5102 is along the width direction DR2 of the region 51. The total area of the recesses 5102 and 5103 is 37.5 mm ² or more.

  Furthermore, the reservoir 510 may have a structure in which a plurality of recesses 5101G are arranged instead of the plurality of recesses 5101 (see FIG. 25). Each of the plurality of recesses 5101 </ b> G includes recesses 5104 and 5105. The recess 5104 has a rectangular planar shape, and the recess 5105 has a groove shape. The recess 5105 guides the electrolytic solution from the power generation element 20 side to the recess 5104.

  Recess 5104 has a long side of 500 μm and a short side of 300 μm. The recess 5105 has a length of 400 μm and a width of 600 μm.

One end of the recess 5105 is connected to one end of the recess 5104. The recesses 5104 and 5105 are arranged such that the major axis of the recess 5104 is along the length direction DR3 of the region 51. The total area of the recesses 5104 and 5105 is 37.5 mm ² or more.

  FIG. 26 is a diagram illustrating another specific example of the cross-sectional shape of the reservoir 510. Referring to FIG. 26, the recess 5101 is not limited to the above-described triangle, but is a rectangle (see (a)), a square (see (b)), a circle (see (c)), or an ellipse (see (d)). The cross-sectional shape may be any one of a pentagon (see (e)) and a hexagon (see (f)).

  When the cross-sectional shape of the recess 5101 is a circle (see (c)) or an ellipse (see (d)), the cross-sectional shape of the recess 5101 is actually an arc shape lacking a part of a circle or an ellipse. If you have. In addition, when the cross-sectional shape of the recess 5101 is a pentagon (see (e)) or a hexagon (see (f)), the cross-sectional shape of the recess 5101 is actually from a shape lacking a part of the pentagon or hexagon. It only has to be.

  Even in the case where the reservoir 510 is composed of the recesses 5101A, 5101B, 5101C, 5101D, 5101E, 5101F, and 5101G, the cross-sectional shapes of the plurality of recesses 5101A, 5101B, 5101C, 5101D, 5101E, 5101F, and 5101G are triangular (see FIG. 21). , Rectangle (see FIG. 26A), square (see FIG. 26B), circular (see FIG. 26C), ellipse (see FIG. 26D), pentagon (FIG. 26) (See (e) of FIG. 26) and a hexagon (see (f) of FIG. 26).

  And in the recessed part 5101F, the recessed part 5102 is a triangle (refer FIG. 21), a rectangle (refer (a) of FIG. 26), a square (refer (b) of FIG. 26), a circle (refer (c) of FIG. 26), It consists of any one of an ellipse (see (d) in FIG. 26), a pentagon (see (e) in FIG. 26), and a hexagon (see (f) in FIG. 26). 21), rectangle (see FIG. 26 (a)), square (see FIG. 26 (b)), circular (see FIG. 26 (c)), oval (see FIG. 26 (d)), It consists of either a pentagon (see FIG. 26E) or a hexagon (see FIG. 26F).

  Even when the recesses 5101, 5101A, 5101B, 5101C, 5101D, 5101E, 5101F, and 5101G have the above-described various shapes, the reservoir 510 has the recesses 5101, 5101A, 5101B, 5101C, 5101D, 5101E, 5101F, and 5101G. It is formed by using a mold in which a plurality of protrusions that realize this shape are arranged in a substantially trapezoidal shape.

  Note that the recesses 5101, 5101A, 5101B, 5101C, 5101D, 5101E, 5101F, and 5101G may have any depth as long as the electrolytic solution accumulates.

  As described above, when the region 51 of the laminate film 4 is sealed, the electrolytic solution is supplied to the reservoir 510, and as described above, the number of the recesses 5101, 5101A, 5101B, 5101C, 5101D, and 5101E depends on the power generation element 20 As you get closer to In addition, the recesses 5101F and 5101G have recesses 5103 and 5105 for supplying the electrolytic solution to the recesses 5102 and 5104. Therefore, when the region 51 is sealed, the resin reservoir 415 (or the resin reservoir 416) can be easily manufactured by the electrolytic solution stored in the plurality of recesses 5101, 5101A, 5101B, 5101C, 5101D, 5101E, 5101F, and 5101G.

  FIG. 27 is a schematic view of an automobile provided with a laminated battery 10 according to an embodiment of the present invention.

  Referring to FIG. 27, automobile 300 includes laminated battery 10, front wheels 310L, 310R, rear wheels 320L, 320R, axles 330, 340, motor 350, and inverter 360.

  The axle 330 connects the front wheel 310L and the front wheel 310R. The axle 340 connects the rear wheel 320L and the rear wheel 320R.

  Inverter 360 is electrically connected to laminated battery 10. Motor 350 is coupled to axle 330 and is electrically connected to inverter 360.

  Laminated battery 10 is charged, and the charged DC power is discharged to supply DC current to inverter 360. The inverter 360 converts the direct current supplied from the laminated battery 10 into an alternating current, and supplies the converted alternating current to the motor 350.

  Motor 350 is driven by an alternating current from inverter 360 to rotate axle 330.

  Thereby, the automobile 300 travels.

  Thus, the laminated battery 10 is used as a power source when the automobile 300 travels.

  FIG. 27 shows the case where the front wheels 310L and 310R are driven by DC power charged in the laminated battery 10, but the rear wheels 320L and 320R are driven by DC power charged in the laminated battery 10. Good.

  The laminated battery 10 may be mounted on a motorcycle and drive the driving wheels of the motorcycle by the method described above.

  In the above description, when the laminate film 4 is sealed, the temperature 51, the pressing pressure, and the pressing time of the seal bars 50 and 60 are changed to seal the region 51 that becomes the seal portion 41 and the region 52 that becomes the seal portion 42. In the embodiment of the present invention, not limited to this, the region 51 to be the seal portion 41 and the region 52 to be the seal portion 42 are sealed by changing any of the temperature, press pressure and press time of the seal bars 50 and 60. May be.

  In the above description, the reservoir 510 has been described as being formed closer to the power generation element 20 than the central portion in the width direction DR2 of the region 51 serving as the seal portion 41. However, in the embodiment of the present invention, However, the reservoir 510 may be formed at an arbitrary position in the region 51 that becomes the seal portion 41.

  Furthermore, in the above description, it has been described that the reservoir portion 510 is formed in the region 51 (= 51a) that becomes the seal portion 41 of the laminate film 4a in the laminate films 4a and 4b. However, the present invention is not limited to this, and the reservoir 510 may be formed in the region 51 (51a, 51b) that becomes both the sealing portions 41 of the laminate films 4a, 4b.

  Further, in the above description, the laminated battery 10 has been described as including the power generation element 20 in which the sheet-like positive electrode 1 and the sheet-like negative electrode 2 are laminated via the separator 3, but in the embodiment of the present invention, The laminated battery is not limited to this, and may include a power generation element in which the sheet-like positive electrode 1 and the sheet-like negative electrode 2 that are overlapped via the separator 3 are wound in a spiral shape. In addition, when the wound electric power generation element is used, you may shape | mold so that a cross section may become flat shape as needed.

  Furthermore, in the above description, the laminate films 4, 4 a, 4 b have been described as having a square planar shape. However, in the embodiment of the present invention, the present invention is not limited to this, and the laminate films 4, 4 a, 4 b are triangular. , Pentagonal, hexagonal, heptagonal, octagonal and other various planar shapes.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  The present invention is applied to a laminated battery and a manufacturing method thereof.

  DESCRIPTION OF SYMBOLS 1 Sheet-like positive electrode, 2 Sheet-like negative electrode, 3 Separator, 4, 4a, 4b Laminated film, 5 Positive electrode external terminal, 6 Negative electrode external terminal, 7 Lead body, 10 Laminate type battery, 20 Electric power generation element, 40-42 Seal part, 50, 60 Seal bar, 51, 52, 511, 512, 521-524, 521A, 522A region, 300 automobile, 310L, 310R front wheel, 320L, 320R rear wheel, 330, 340 axle, 350 motor, 360 inverter, 411 metal Layer, 412, 413, 414, 417 resin, 415, 416, 418 resin reservoir, 510 reservoir, 4150, 4160 cavity, 4181 protrusion, 4182, 4183 recess, 5101, 5101A, 5101B, 5101C, 5101D, 5101E , 5101F, 101G, 5102,5103,5104,5105 recess.

Claims (5)

A power generation element including a sheet-like positive electrode and a sheet-like negative electrode;
A laminate film laminated with the power generation element,
The laminate film is
A first seal portion;
A second seal portion having a weld strength weaker than the weld strength of the first seal portion;
A laminated battery comprising: a resin reservoir provided in contact with an end of the second seal portion on the power generation element side and including a cavity. On one main surface of the first laminate film to be arranged on one side of the power generation element including the sheet-like positive electrode and the sheet-like negative electrode and on one main surface of the second laminate film to be arranged on the other side of the power generation element A first step of applying a resin;
The first and second laminate films are arranged on both sides of the power generation element so as to sandwich the power generation element between one main surface of the first laminate film and one main surface of the second laminate film. And the process of
A third step of welding a resin applied to a region to be a first seal portion that does not function as a cleavage vent among regions to be a seal portion of the first and second laminate films;
After the third step, the electrolytic solution is injected through the region that becomes the second seal portion functioning as the cleavage vent, and the resin applied to the region that becomes the second seal portion is added to the electrolytic solution. A fourth step of wetting by
And a fifth step of welding a resin applied to a region to be the second seal portion after the fourth step. After the first step, further comprising a sixth step of forming a recess in the resin applied to the region to be the second seal portion of at least one of the first and second laminate films,
The method for manufacturing a laminated battery according to claim 2, wherein the second to fifth steps are executed after the sixth step.   4. The method for manufacturing a laminated battery according to claim 3, wherein, in the sixth step, the concave portion is formed closer to the power generation element than a central portion in a width direction of a region serving as the second seal portion. The fourth step includes
After the third step, a first sub-step of injecting an electrolyte solution through a region serving as the second seal portion;
A second sub-process of welding the resin applied to the outer peripheral portion of the region to be the second seal portion;
A third sub-step of holding the first and second laminate films and the power generating element for a certain period of time with the welded outer peripheral portion facing down;
The manufacturing method of the laminated battery of Claim 2 including the 4th sub process of cut | disconnecting the said welded outer peripheral part.

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