Manufacturing method for laminate type battery, and laminate type battery

Abstract

To provide a manufacturing method for a laminate type battery capable of suppressing opening of a bent part and of manufacturing a laminate type battery excellent in reliability about damage of the bent part.SOLUTION: A manufacturing method for a laminate type battery manufactures a laminate type battery from an unfinished product. The unfinished product is provided with an electrode body and an outer package covering the electrode body which is composed of a laminate film. The outer package has a housing part housing the electrode body and an edge seal part formed by ends of the laminate film being welded. The edge seal part includes a bent part bent against a principle surface of the electrode body. The manufacturing method includes preparing the unfinished product and filling an unsolidified resin composition between the bent part and the housing part.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a method for manufacturing a laminated battery and a laminated battery. [Background technology]

[0002] To improve the volumetric efficiency of laminated batteries, the edge seal region of the exterior body made of laminated film is folded and formed by welding the edges of the laminated film together.

[0003] Patent Document 1 discloses a method for manufacturing a secondary battery (hereinafter also referred to as a "laminated battery"). The manufacturing method includes a first step and a second step. The first and second steps are performed in this order. In the first step, a pressure plate is brought into contact with a folding base point of an end portion of an exterior body (hereinafter also referred to as an "edge seal portion"). In the second step, the pressure plate and a pressing plate positioned opposite the pressure plate are slid to sandwich the edge seal portion, folding the edge seal portion around the base point, and sandwiching the edge seal portion between the pressure plate and the pressing plate to form the folded portion. The surface of the pressing plate that slides against the edge seal portion has a specific surface. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-200973 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the laminated battery disclosed in Patent Document 1, there is a risk of the folded portion opening due to springback. "Springback" refers to a phenomenon in which at least a portion of the deformation caused by pressure tends to return to its original shape, driven by residual stress generated by the deformation. The laminated film is soft and easily damaged. If the folded portion opens, there is a risk of damage (e.g., tearing) occurring at the folded portion (especially near the base point of the folded portion of the laminated film).

[0006] The present disclosure has been made in consideration of the above circumstances. The problem to be solved by one embodiment of the present disclosure is to provide a method for manufacturing a laminated battery that can produce a laminated battery that is suppressed from opening at the bent portion and has excellent reliability against scratches at the bent portion. Another problem to be solved by another embodiment of the present disclosure is to provide a laminated battery in which opening at the bent portion is suppressed and which has excellent reliability against scratches at the bent portion. [Means for solving the problem]

[0007] The means for solving the above problems include the following embodiments.

[0008] <1> The method for manufacturing a laminated battery of the first embodiment includes: A manufacturing method for manufacturing a laminated battery from an unfinished product, comprising: The unfinished product comprises an electrode body and an exterior body made of a laminate film that covers the electrode body, the exterior body has a housing portion that houses the electrode body and an edge seal portion that is formed by welding ends of the laminate film together, the edge seal region includes a folding region that is folded relative to a main surface of the electrode body, providing the workpiece; Filling an unsolidified resin composition between the bent portion and the containing portion; The method for manufacturing a laminated battery includes:

[0009] In the present disclosure, the term "laminate film" refers to a film having at least a metal layer, a first resin layer laminated on one main surface of the metal layer, and a second resin layer laminated on the other main surface of the metal layer.

[0010] The manufacturing method of the first embodiment includes filling the gap between the bent portion and the housing portion with an unsolidified resin composition. As a result, the bent portion of the resulting laminated battery is fixed by the solidified resin composition (resin-filled portion). As a result, the manufacturing method of the first embodiment can manufacture a laminated battery that is suppressed from opening at the bent portion and has excellent reliability against scratches at the bent portion.

[0011] <2> The method for manufacturing a laminated battery according to the second embodiment includes the steps of: A manufacturing method for manufacturing a laminated battery from an unfinished product, comprising: The unfinished product comprises an electrode body and an exterior body made of a laminate film that covers the electrode body, the exterior body has a housing portion that houses the electrode body and an edge seal portion that is formed by welding ends of the laminate film together, the edge seal region includes a bent region bent relative to a main surface of the electrode body and a non-bent region, providing the workpiece; applying an unsolidified resin composition to a surface of the bent portion on the electrode body side; Folding the folding portion to which the unsolidified material is applied to form a folding portion; folding the non-bending portion along a base line that is located closer to the electrode body than a portion of the non-bending portion that overlaps with the folding portion; The method for manufacturing a laminated battery includes:

[0012] The manufacturing method of the second embodiment includes folding the foldable portion coated with the unsolidified material to form a foldable portion. As a result, the foldable portion of the resulting laminated battery is fixed by the solidified resin composition (resin-filled portion). As a result, the manufacturing method of the second embodiment can manufacture a laminated battery in which opening of the foldable portion is suppressed and which has excellent reliability against scratches at the foldable portion.

[0013] <3> The laminated battery of the third embodiment comprises: An electrode body; an exterior body made of a laminate film that covers the electrode body; a resin filling portion; Equipped with the exterior body has a housing portion that houses the electrode body and an edge seal portion that is formed by welding ends of the laminate film together, the edge seal region includes a folding region that is folded relative to a main surface of the electrode body, In the laminated battery, the resin-filled portion includes a solidified resin composition filled between the bent portion and the housing portion.

[0014] In the present disclosure, the term "solidified resin composition" refers to a resin composition that is in a solid state at the operating temperature of a laminated battery (for example, 120° C. or lower).

[0015] In a third aspect, the resin-filled portion includes a solidified resin composition filled between the bent portion and the housing portion. This fixes the bent portion of the laminated battery by the resin-filled portion. As a result, the laminated battery of the third aspect is prevented from opening at the bent portion and has excellent reliability against scratches at the bent portion.

[0016] <4> The laminated battery of the fourth aspect comprises: An electrode body; an exterior body made of a laminate film that covers the electrode body; a resin filling portion; Equipped with the exterior body has a housing portion that houses the electrode body and an edge seal portion that is formed by welding ends of the laminate film together, the edge seal region has a bent region bent relative to a main surface of the electrode body, The folding portion has a folding portion and a non-folding portion, In the laminated battery, the resin-filled portion includes a solidified resin composition filled between the folded portion and the non-folded portion.

[0017] In the manufacturing method of the fourth aspect, the resin-filled portion includes a solidified resin composition filled between the folded portion and the non-folded portion. This fixes the folded portion of the laminated battery by the resin-filled portion. As a result, the laminated battery of the fourth aspect is prevented from opening at the folded portion and has excellent reliability against scratches at the folded portion. [Effects of the Invention]

[0018] According to one embodiment of the present disclosure, a method for manufacturing a laminated battery is provided that can manufacture a laminated battery that is suppressed from opening at the bent portion and has excellent reliability against scratches at the bent portion. According to another embodiment of the present disclosure, a laminated battery is provided in which opening at the bent portion is suppressed and reliability against scratches at the bent portion is excellent. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view of a laminated battery according to the first embodiment. [Figure 2] FIG. 2 shows a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a diagram schematically showing the configuration of a folding device used in the manufacturing method of the laminated battery according to the first embodiment. [Figure 4] FIG. 4 is a diagram for explaining the method for manufacturing the laminated battery according to the first embodiment. [Figure 5]FIG. 5 is a cross-sectional view of a laminated battery according to the second embodiment. [Figure 6] FIG. 6 is a diagram for explaining the method for manufacturing a laminated battery according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] In the present disclosure, a numerical range indicated using "to" means a range that includes the numerical values ​​before and after "to" as the minimum and maximum values, respectively. In numerical ranges described in stages in the present disclosure, the upper or lower limit value described in a certain numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. In the present disclosure, a combination of two or more preferred embodiments is a more preferred embodiment. In the present disclosure, the term "process" includes not only an independent process, but also a process that cannot be clearly distinguished from other processes, as long as the intended purpose of the process is achieved.

[0021] Hereinafter, a method for manufacturing a laminated battery according to the present disclosure and an embodiment of a laminated battery according to the present disclosure will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0022] (1) First embodiment The manufacturing method for a laminated battery according to the first embodiment is a method for manufacturing a laminated battery 1A (hereinafter also referred to as "battery 1A") from an unfinished product 1a. The manufacturing method includes a preparation step, a coating step, a solidification step, and a finish bending step. The preparation step, coating step, solidification step, and finish bending step are performed in this order.

[0023] (1.1) Laminated battery As shown in Fig. 1, the battery 1A includes an exterior body 10A, a resin-filled portion 20A, an electrode assembly 30, and a pair of terminals 40. One of the pair of terminals 40 is a positive electrode terminal. The other of the pair of terminals 40 is a negative electrode terminal. The electrode assembly 30 is a rectangular parallelepiped.

[0024] In the first embodiment, the longitudinal direction of the main surface S30 of the electrode body 30 is defined as the X-axis direction, the lateral direction of the main surface S30 of the electrode body 30 is defined as the Y-axis direction, and the thickness direction of the electrode body 30 is defined as the Z-axis direction. The X-axis, Y-axis, and Z-axis are each perpendicular to one another. Note that these directions do not limit the orientation of the laminated battery of the present disclosure during use.

[0025] The pair of terminals 40 are arranged opposite each other with the electrode body 30 interposed therebetween. Each of the pair of terminals 40 is electrically connected to the electrode body 30. The exterior body 10A covers the electrode body 30. The electrode body 30 is sealed by the pair of terminals 40 and the exterior body 10A.

[0026] (1.1.1) Exterior The exterior body 10A is made of a single laminate film. As shown in FIG. 2, the exterior body 10A has a storage area R10A and an edge seal area R10B. The storage area R10A stores the electrode assembly 30. The edge seal area R10B is formed by welding together the ends of the laminate film. The edge seal area R10B has a folded area R10B1 and a non-folded area R10B2. The folded area R10B1 is folded with respect to the main surface S30 of the electrode assembly 30. In the first embodiment, the angle θA of the folded area R10B1 with respect to the main surface S30 (hereinafter also referred to as the "folding angle θA") (see FIG. 2) is, for example, approximately 90°. The non-folded area R10B2 extends in the positive Y-axis direction from the end of the side surface of the storage area R10A on the positive Y-axis side, on the negative Z-axis side. The bent portion R10B1 and the accommodation portion R10A face each other.

[0027] The laminate film is formed by laminating an outer insulating layer, a metal layer, and an inner insulating layer in this order. The thickness of the laminate film may be 70 μm to 220 μm. The outer insulating layer functions as a protective layer for the metal layer. Examples of materials for the protective layer include polyethylene terephthalate (PET) and nylon. The metal layer blocks the passage of gas (e.g., moisture or air) between the outside and the inside of the battery 1A. Examples of materials for the metal layer include aluminum, aluminum alloy, and stainless steel. The inner insulating layer electrically insulates the pair of terminals 40 and the electrode body 30 from the metal layer. Examples of materials for the inner insulating layer include polypropylene (PP) and polyethylene (PE).

[0028] (1.1.2) Resin filling section The resin-filled portion 20A fixes the bent portion R10B1 of the exterior body 10A. The resin-filled portion 20A contains a solidified resin composition. The solidified resin composition fills the gap R1A between the bent portion R10B1 and the storage portion R10A. The resin composition may be a known resin composition (e.g., a thermoplastic resin composition, a thermosetting resin composition, a photocurable resin composition, etc.) as long as it is in a solid state at the operating temperature of the battery 1A (e.g., 120°C or lower). The resin composition contains a known resin (e.g., a thermoplastic resin, a thermosetting resin, a photocurable resin, etc.). The resin composition may further contain a polymerization initiator, a curing agent, etc., as necessary.

[0029] (1.1.3) Electrode body The electrode assembly 30 functions as a power generating element of the battery 1A. The electrode assembly 30 may be a known electrode assembly. The electrode assembly 30 may have a plurality of unit electrode bodies. The unit electrode body may include a so-called solid electrolyte (the content of the electrolytic solution as the electrolyte is less than 5 mass% of the total amount of the electrolyte) that uses an inorganic solid electrolyte as the electrolyte. The unit electrode body may have a structure in which a positive electrode current collector, a positive electrode layer, a solid electrolyte layer, a negative electrode layer, and a negative electrode current collector are stacked in this order along the Z-axis direction.

[0030] (1.1.4) Terminals The terminal 40 is a rectangular parallelepiped object. When viewed from the Z-axis direction, the terminal 40 has a U-shape. The terminal 40 may be made of a metal (for example, stainless steel (SUS)).

[0031] (1.2) Unfinished product Unfinished product 1a is similar to battery 1A except that unfinished product 1a does not include resin-filled portion 20A and the bending angle θA is an acute angle.

[0032] (1.3) Folding device In the first embodiment, a folding device 100 is used in the preparation process, the application process, and the finish bending process. The folding device 100 folds the edge seal region R10B and applies the unsolidified resin composition. As shown in FIG. 3, the folding device 100 includes a conveying section 110, an upstream roller group 120, a dispenser 130, and a downstream roller group 140. The upstream roller group 120, the dispenser 130, and the downstream roller group 140 are arranged in this order along the conveying direction D.

[0033] The conveying section 110 is configured to convey the unfinished product 1a in a conveying direction D.

[0034] The upstream roller group 120 bends the edge seal region R10B so that the bending angle θA ranges from 0° to a third angle (e.g., 85°). A base line L1 (see FIGS. 2 and 4) is the bending line. The upstream roller group 120 includes a pair of rollers 121, a pair of rollers 122, and a pair of rollers 123. The pair of rollers 121, the pair of rollers 122, and the pair of rollers 123 are arranged in this order along the conveying direction D. The pair of rollers 121 bends the bending region R10B1 so that the bending angle θA ranges from 0° to a first angle (e.g., 30°). The pair of rollers 121 includes a backup roller 121A and a bending roller 121B. The bending roller 121B has an inclined surface S121 (see FIG. 4). The edge seal region R10B is sandwiched between the pair of rollers 121 and bent along the inclined surface S121. The pair of rollers 122 bends the bending portion R10B1 so that the bending angle θA changes from a first angle to a second angle (e.g., 60°). The pair of rollers 122 includes a backup roller 122A and a bending roller 122B. The bending roller 122B has a first inclined surface. The bending portion R10B1 is sandwiched between the pair of rollers 122 and bent along the first inclined surface. The pair of rollers 123 bends the bending portion R10B1 so that the bending angle θA changes from the second angle to a third angle (e.g., 85°). The pair of rollers 123 includes a backup roller 123A and a bending roller 123B. The bending roller 123B has a second inclined surface. The bending portion R10B1 is sandwiched between the pair of rollers 123 and bent along the second inclined surface.

[0035] The dispenser 130 applies the unsolidified resin composition to the gap R1A. The dispenser 130 may be a known dispenser.

[0036] The downstream roller group 140 bends the bending portion R10B1 so that the bending angle θA is approximately 90° from the third angle. The downstream roller group 140 has an inclined roller 140A and a bending roller 140B. The rotation axis direction of the inclined roller 140A is inclined with respect to the Y axis direction. The angle of the rotation axis direction of the inclined roller 140A with respect to the Y axis direction is, for example, 5°. The surface layer of the bending roller 140B is formed of an elastic body. The bending roller 140B is biased in the Y axis direction (direction perpendicular to the conveying direction D) by a biasing means (for example, a spring, etc.).

[0037] (1.4) Preparation process In the preparation step, an unfinished product 1a is prepared. More specifically, in the first embodiment, the unfinished product 1a is formed by sandwiching the edge seal region R10B of the unfolded product 1au (see FIG. 4) between the upstream roller group 120 of the folding device 100. The unfolded product 1au is similar to the unfinished product 1a except that the edge seal region R10B is not folded. The method for preparing the unfolded product 1au is a known method.

[0038] (1.5) Coating process In the application step, an unsolidified resin composition is filled between the bent portion R10B1 and the storage portion R10A, as shown in Fig. 4. Specifically, in the first embodiment, the unsolidified resin composition is applied to the gap R1A of the unfinished product 1a to form an applied object 20AU.

[0039] (1.6) Finish bending process In the finish bending process, the bending portion R10B1 is bent so that the bending angle θA is approximately 90°, as shown in Fig. 4. In detail, in the first embodiment, the unfinished product 1a on which the application object 20AU is formed is sandwiched between the downstream roller group 140 of the bending device 100, thereby bending the bending portion R10B1.

[0040] (1.7) Solidification process In the solidification step, the applied material 20AU is solidified to form the resin filled portion 20A, thereby obtaining the battery 1A.

[0041] The solidification method is appropriately selected depending on the type of resin composition, etc. When the resin composition is a thermoplastic resin composition or a thermosetting resin composition, the coated object 20AU may be solidified by cooling. The cooling method is not particularly limited, and examples include a method of leaving it at room temperature (25°C) or a method of blowing cooling air onto it. When the resin composition is a photocurable resin composition, the coated object 20AU may be solidified by irradiating it with active energy rays (for example, visible light, ultraviolet light, X-rays, or electron beams).

[0042] (1.8) Action and Effect As described with reference to Figures 1 to 3, the manufacturing method of the first embodiment includes a preparation step and an application step. As a result, the bent portion R10B1 of the resulting battery 1A is fixed by a solidified resin composition (resin-filled portion 20A). As a result, the manufacturing method of the first embodiment can manufacture a laminated battery 1A in which opening of the bent portion R10B1 is suppressed and which has excellent reliability against scratches at the bent portion R10B1.

[0043] As described with reference to FIGS. 1 to 3, the battery 1A includes an electrode assembly 30, an exterior body 10A, and a resin-filled portion 20A. The exterior body 10A has a storage area R10A and an edge seal area R10B. The edge seal area R10B includes a folded area R10B1. The resin-filled portion 20A includes a solidified resin composition filled between the folded area R10B1 and the storage area R10A. This fixes the folded area R10B1 of the battery 1A to a fixed state by the resin-filled portion 20A. As a result, the folding area R10B1 of the battery 1A is prevented from opening, and the folding area R10B1 has excellent reliability against scratches.

[0044] (2) Second embodiment The method for manufacturing a laminated battery according to the second embodiment is a method for manufacturing a laminated battery 1B (hereinafter also referred to as "battery 1B") from an unfinished product 1b. The manufacturing method includes a preparation step, a coating step, a folding step, a solidification step, and a bending step. The preparation step, coating step, folding step, solidification step, and bending step are performed in this order.

[0045] (2.1) Laminated battery Battery 1B is similar to battery 1A, except for the bending of the edge seal area and the resin-filled portion. Battery 1B includes an exterior body 10B, a resin-filled portion 20B, an electrode assembly 30, and a pair of terminals 40.

[0046] (2.1.1) Exterior The exterior body 10B is similar to the exterior body 10A except that the edge seal region R10B is bent differently. The exterior body 10A has a storage region R10A and an edge seal region R10B. The edge seal region R10B has a bent region R10B10 and a non-bent region R10B20. The bent region R10B10 has a folded region R10B11 and a non-folded region R10B12. The bent region R10B10 is bent with respect to the main surface S30 of the electrode assembly 30. In the second embodiment, the angle θB of the bent region R10B10 with respect to the main surface S30 (hereinafter also referred to as the "bending angle θB") (see FIG. 5) is, for example, approximately 90°. The non-folding portion R10B20 extends in the positive direction of the Y axis from the end portion on the negative Z axis side of the side surface on the positive Y axis side of the storage portion R10A. The folding portion R10B11 and the non-folding portion R10B12 face each other.

[0047] (2.1.2) Resin filling section Resin filled portion 20B fixes folded portion R10B11 of outer casing 10B. Resin filled portion 20B includes a solidified resin composition. The solidified resin composition is filled between folded portion R10B11 and non-folded portion R10B12. Examples of the resin composition of resin filled portion 20B include the same resin compositions as those exemplified for resin filled portion 20A.

[0048] (2.2) Unfinished product The unfinished product 1b is similar to the battery 1B except that the unfinished product 1b does not include the resin-filled portion 20B and the bent portion R10B10 is not formed.

[0049] (2.3) Folding device In the second embodiment, a folding device (not shown) is used in the preparing step, the applying step, and the folding step. The folding device folds the edge seal region R10B and applies the unsolidified resin composition. The folding device is similar to the folding device 100 except that the upstream roller group and the downstream roller group have different configurations. The folding device includes a conveying section 110, an upstream roller group, a dispenser 130, and a downstream roller group. The upstream roller group, the dispenser 130, and the downstream roller group are arranged in this order along the conveying direction D.

[0050] The upstream roller group folds the edge seal region R10B so that the angle θC (hereinafter also referred to as the "bending angle θC") (see FIG. 6) of a region R10B110 (hereinafter also referred to as the "bending region R10B110") (see FIG. 6) corresponding to the folding region R10B11 of the battery 1B with respect to the main surface S30 is between 0° and approximately 90°. The base line L2 (see FIGS. 5 and 6) is the folding line. The upstream roller group includes a pair of first rollers 151 (see FIG. 6), a pair of second rollers, and a pair of third rollers. The pair of first rollers 151, the pair of second rollers, and the pair of third rollers are arranged in this order along the conveying direction D. The pair of first rollers 151 folds the folding region R10B110 so that the folding angle θC is between 0° and a fourth angle (e.g., 30°). The pair of first rollers 151 includes a first backup roller 151A and a first folding roller 151B. The first folding roller 151B has a third inclined surface S151 (see FIG. 6). The edge seal region R10B is sandwiched between the pair of first rollers 151 and folded along the third inclined surface S151 of the first folding roller 151B. The pair of second rollers bend the bending portion R10B110 so that the bending angle θC is between the fourth angle and a fifth angle (e.g., 60°). The pair of second rollers includes a second backup roller and a second bending roller. The second bending roller has a fourth inclined surface. The bending portion R10B110 is sandwiched between the pair of second rollers and bent along the fourth inclined surface of the second bending roller. The pair of third rollers bend the bending portion R10B110 so that the bending angle θC is approximately 90° from the fifth angle. The pair of third rollers includes a third backup roller and a third bending roller. The third bending roller has a fifth inclined surface. The bending portion R10B110 is sandwiched between the pair of third rollers and bent along the fifth inclined surface of the third bending roller.

[0051] The downstream roller group bends the bending portion R10B110 so that the bending angle θC becomes approximately 0° from the third angle. In other words, the bending portion R10B110 is folded to become the folding portion R10B11. The upstream roller group has a pair of fourth rollers, a pair of fifth rollers, and a pair of sixth rollers. The pair of fourth rollers, the pair of fifth rollers, and the pair of sixth rollers are arranged in this order along the conveying direction D. The pair of fourth rollers bend the bending portion R10B110 so that the bending angle θC is between approximately 90° and a sixth angle (e.g., 120°). The pair of fourth rollers includes a first contact roller and a first opposing roller. The first contact roller has a first large diameter portion, a first small diameter portion, and a first flat portion connecting the first large diameter portion and the first small diameter portion. The first opposing roller has a second large diameter portion, a second small diameter portion, and a first inclined surface portion connecting the second large diameter portion and the second small diameter portion. The bending portion R10B110 is sandwiched between the pair of fourth rollers and bent along the first inclined surface portion of the first opposing roller. The pair of fifth rollers bend the bending portion R10B110 so that the bending angle θC is between the sixth angle and a seventh angle (e.g., 150°). The pair of fifth rollers includes a second contact roller and a second opposing roller. The second contact roller has a third large diameter portion, a third small diameter portion, and a second flat portion connecting the third large diameter portion and the third small diameter portion. The second opposing roller has a fourth large diameter portion, a fourth small diameter portion, and a second inclined surface portion connecting the fourth large diameter portion and the fourth small diameter portion. The bending portion R10B110 is sandwiched between the pair of fifth rollers and bent along the second inclined surface portion of the second opposing roller. The pair of sixth rollers bend the bending portion R10B110 so that the bending angle θC is approximately 0° from the seventh angle. The pair of sixth rollers includes a third contact roller and a third opposing roller. The third contact roller has a fifth large diameter portion, a fifth small diameter portion, and a third flat portion connecting the fifth large diameter portion and the fifth small diameter portion. The third opposing roller has a sixth large diameter portion, a sixth small diameter portion, and a third inclined surface portion connecting the sixth large diameter portion and the sixth small diameter portion. The bending portion R10B110 is sandwiched between the pair of sixth rollers and bent along the third inclined surface portion of the third opposing roller.

[0052] (2.4) Preparation process In the preparation step, an unfinished product 1b is prepared. More specifically, in the second embodiment, the edge seal region R10B of the unfolded product 1bu (see FIG. 6) is sandwiched between the upstream roller group of the folding device to form the unfinished product 1b. The unfolded product 1bu is similar to the unfinished product 1b except that the edge seal region R10B is not folded. The method for preparing the unfolded product 1bu is a known method.

[0053] (2.5) Coating process In the application step, as shown in Fig. 6, an unsolidified resin composition is applied to the surface of the bent portion R10B110 facing the electrode body 30. Specifically, in the second embodiment, an unsolidified resin composition is applied to the surface SR10B110 (see Fig. 6) of the bent portion R10B110 facing the electrode body 30 to form an applied matter 20BU.

[0054] (2.6) Folding process In the folding process, the folding region R10B110 to which the unsolidified resin composition is applied is folded to form the folding region R10B11, as shown in Fig. 6. More specifically, in the second embodiment, the folding region R10B110 to which the unsolidified resin composition is applied is sandwiched between a group of downstream rollers of the folding device to form the folding region R10B11.

[0055] (2.7) Solidification process In the solidification step, the applied matter 20BU is solidified to form the resin filled portion 20 B. As the solidification method of the second embodiment, the same methods as those exemplified as the solidification method of the first embodiment can be used.

[0056] (2.8) Bending process In the folding step, as shown in Fig. 6, the non-folding portion R10B120 (see Fig. 6) is folded along a base line L3 (see Fig. 6) that is located closer to the electrode body 30 than the portion of the non-folding portion R10B120 that overlaps with the folding portion R10B11, thereby obtaining a battery 1B.

[0057] The folding method is not particularly limited and may be any known method.

[0058] (2.9) Action and Effect 5 and 6, the manufacturing method of the second embodiment includes a preparation step, a coating step, a folding step, and a bending step. As a result, the folding region R10B11 of the resulting battery 1B is fixed by the resin filling portion 20B. As a result, the manufacturing method of the second embodiment can manufacture a laminated battery 1B in which the folding region R10B10 is prevented from opening and which is highly reliable against scratches at the folding region R10B10.

[0059] As described with reference to FIGS. 5 and 6, the battery 1B includes an electrode assembly 30, an exterior body 10B, and a resin-filled portion 20B. The exterior body 10B has a storage portion R10A and an edge-sealed portion R10B. The edge-sealed portion R10B has a folded portion R10B10. The folded portion R10B10 has a folded portion R10B11 and a non-folded portion R10B12. The resin-filled portion 20B contains a solidified resin composition filled between the folded portion R10B11 and the non-folded portion R10B12. This secures the folded portion R10B11 of the battery 1B in place by the resin-filled portion 20B. As a result, the folded portion R10B10 of the laminated battery 1B is prevented from opening and has excellent reliability against scratches at the folded portion R10B10.

[0060] (3) Variations Although the manufacturing method of the laminated battery according to the first embodiment includes a solidification step and a finish bending step, the present disclosure is not limited thereto. The manufacturing method of the laminated battery according to the first embodiment does not necessarily have to include the solidification step and the finish bending step.

[0061] Although the method for manufacturing a laminated battery according to the second embodiment includes a solidification step, the present disclosure is not limited thereto. The method for manufacturing a laminated battery according to the second embodiment does not necessarily have to include a solidification step.

[0062] In the second embodiment, the space between the storage portion R10A and the bent portion R10B10 is not filled with a solidified resin composition, but the present disclosure is not limited to this. In the second embodiment, the space between the storage portion R10A and the bent portion R10B10 may be filled with a solidified resin composition. [Explanation of symbols]

[0063] 1A, 1B: laminated battery, 10A, 10B: exterior body, 20A, 20B: resin-filled portion, 30: electrode body, 40: terminal

Claims

1. A manufacturing method for manufacturing a laminated battery from an unfinished product, comprising: The unfinished product comprises an electrode body and an exterior body made of a laminate film that covers the electrode body, the exterior body has a housing portion that houses the electrode body and an edge seal portion that is formed by welding ends of the laminate film together, the edge seal region includes a folding region that is folded relative to a main surface of the electrode body, providing the workpiece; Filling an unsolidified resin composition between the bent portion and the containing portion; A method for manufacturing a laminated battery, comprising:

2. A manufacturing method for manufacturing a laminated battery from an unfinished product, comprising: The unfinished product comprises an electrode body and an exterior body made of a laminate film that covers the electrode body, the exterior body has a housing portion that houses the electrode body and an edge seal portion that is formed by welding ends of the laminate film together, the edge seal region includes a bent region bent relative to a main surface of the electrode body and a non-bent region, providing the workpiece; applying an unsolidified resin composition to a surface of the bent portion on the electrode body side; Folding the folding portion to which the unsolidified material is applied to form a folding portion; folding the non-bending portion along a base line that is located closer to the electrode body than a portion of the non-bending portion that overlaps with the folding portion; A method for manufacturing a laminated battery, comprising:

3. An electrode body; an exterior body made of a laminate film that covers the electrode body; a resin filling portion; Equipped with the exterior body has a housing portion that houses the electrode body and an edge seal portion that is formed by welding ends of the laminate film together, the edge seal region includes a folding region that is folded relative to a main surface of the electrode body, The resin-filled portion includes a solidified resin composition filled between the bent portion and the housing portion.

4. An electrode body; an exterior body made of a laminate film that covers the electrode body; a resin filling portion; Equipped with the exterior body has a housing portion that houses the electrode body and an edge seal portion that is formed by welding ends of the laminate film together, the edge seal region has a bent region bent relative to a main surface of the electrode body, The folding portion has a folding portion and a non-folding portion, The laminated battery, wherein the resin-filled portion includes a solidified resin composition filled between the folded portion and the non-folded portion.

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