JP7299816B2 - Stacked battery manufacturing method, stacked battery manufacturing apparatus, and stacked battery - Google Patents

Description

The present invention relates to a stack type battery manufacturing method, a stack type battery manufacturing apparatus, and a stack type battery.

For example, as proposed in Japanese Unexamined Patent Application Publication No. 2002-100000, a laminated battery in which positive electrode plates and negative electrode plates are alternately laminated has been widely used. A lithium ion secondary battery can be exemplified as an example of a stacked battery. One of the features of the lithium ion secondary battery is that it has a large capacity compared to other types of stacked batteries. Lithium-ion secondary batteries having such characteristics are expected to spread further in various applications such as on-vehicle applications and stationary housing applications.

Such a stacked battery includes an electrode assembly having a plurality of electrode plates and an outer packaging housing the electrode assembly. In a laminated battery, in order to extract electricity from the electrode plate, a tab is attached to the electrode plate and extends partially from the inside of the outer package to the outside.

JP 2012-33449 A

When a tab located inside the exterior body comes into contact with the exterior body, the tab may damage the exterior body.

An object of the present invention is to provide a stacked battery that can effectively solve such problems.

A method for manufacturing a stacked type battery according to the present invention includes attaching a plate-shaped tab having a first surface and a second surface to at least one of a plurality of electrode plates of an electrode body having a plurality of stacked electrode plates. , a joining step of joining the tab to the electrode plate so as to be electrically connected, and a housing step of housing the electrode body inside an exterior body, wherein the tab is connected to the first edge and the electrode plate. , and a second edge opposite to the first edge, and a protrusion located at least on the first edge and protruding from the first surface, wherein in the joining step, the tab is positioned at the first edge. The tab is joined to the electrode plate so that the tab faces the electrode body on one surface side and the first edge side overlaps the electrode body, and in the housing step, the first edge side overlaps the outer body. and the tab is partially housed inside the exterior body such that the second edge is located outside the exterior body.

In the manufacturing method of the stacked type battery according to the present invention, the tab may be curved so as to be concave toward the first surface between the first side and the second side.

In the method for manufacturing a stacked battery according to the present invention, the protrusion may be positioned at least on the first edge and the second edge.

In the manufacturing method of the stacked type battery according to the present invention, the tab may be joined to the electrode plate by welding the tab to the electrode plate in the joining step.

In the method of manufacturing a stacked battery according to the present invention, the tab is partially positioned on the electrode assembly placed on a support surface and faces the electrode assembly on the first surface side before the joining step. further comprising an arranging step of arranging the tab so as to
In the joining step, the tab may be welded to the electrode plate by bringing a welding tool into contact with the second surface of the tab.

In the manufacturing method of the stacked type battery according to the present invention, in the arranging step, the tab may be arranged such that the protrusion located on the first edge contacts the electrode body.

In the manufacturing method of the stacked type battery according to the present invention, in the arranging step, the tab may be arranged by moving an adsorption portion adsorbed to the second surface side of the tab.

In the manufacturing method of the stacked type battery according to the present invention, the protrusion may have a height of 0.1 to 0.9 times the thickness of the tab before the joining step.

In the method for manufacturing a stacked battery according to the present invention, the protrusion may have a height of 20 μm or more and 180 μm or less before the joining step.

A stacked-type battery according to the present invention includes an electrode body having a plurality of stacked electrode plates, an outer body housing the electrode body, and electrically connected to at least one of the plurality of electrode plates, a tab having a first side and a second side, and having a first side and a second side facing the first side, the tab being attached to the electrode on the side of the first side; The first end side is connected to the electrode plate so as to face the body and overlap with the electrode body, and the outer body has the first end side located inside the outer body, and the second end side is positioned inside the outer body. The tab is partially accommodated inside such that the edge is located outside the exterior body, and the tab is located at least on the first edge and protrudes from the first surface. including.

In the stacked battery according to the present invention, among the electrode plates on which the tabs at least partially overlap, the electrode plate closest to the tab may be penetrated by the protrusion.

In the stacked battery according to the present invention, among the electrode plates on which the tabs at least partially overlap, the electrode plate closest to the tab may have a recess for receiving the protrusion.

In the stacked battery according to the present invention, the tab may be curved so as to be concave toward the first surface between the first edge and the second edge.

In the stacked battery according to the present invention, the protrusion may be positioned at least on the first edge and the second edge.

In the stacked battery according to the present invention, the protrusion may have a height of 0.1 to 0.9 times the thickness of the tab.

In the stacked battery according to the present invention, the protrusion may have a height of 20 μm or more and 180 μm or less.

In the stacked battery according to the present invention, the tab may have a thickness of 100 μm or more.

In the stacked battery manufacturing apparatus according to the present invention, a plate-shaped tab having a first surface and a second surface is attached to at least one of the plurality of electrode plates of an electrode body having a plurality of stacked electrode plates. , a joining device that joins the tab to the electrode plate so as to be electrically connected, and a housing device that houses the electrode body inside an exterior body, wherein the tab is connected to the first edge and the electrode plate. , and a second edge opposite to the first edge, and a protrusion located at least on the first edge and protruding from the first surface, the bonding device comprising: The tab is joined to the electrode plate so that the first side faces the electrode body and the first side overlaps the electrode body, and the housing device has the first side facing the outer body. and the tab is partially housed inside the exterior body such that the second edge is located outside the exterior body.

According to the laminated battery of the present invention, it is possible to suppress damage to the exterior body.

FIG. 1 is a diagram for explaining an embodiment of the present invention, and is a perspective view showing a stacked battery. FIG. 2 is a perspective view showing an electrode body included in the stacked battery of FIG. 1. FIG. 3 is a plan view showing an electrode assembly included in the stacked battery of FIG. 1. FIG. FIG. 4 is a cross-sectional view showing an electrode body included in the stacked battery of FIG. FIG. 5 is a cross-sectional view showing a cross section along line VV of FIG. FIG. 6 is an enlarged plan view of a portion surrounded by a dashed line denoted by VI in FIG. 3 and viewed from the side where the first tab of the positive electrode plate is located. FIG. 7 is a plan view showing an enlarged view of a portion surrounded by a dashed line labeled VII in FIG. FIG. 8 is a diagram showing how the first tab is joined to the external member. FIG. 9 is a cross-sectional view showing the shape of the tab before being joined to the electrode plate. FIG. 10 is a diagram showing how the tab is produced. FIG. 11 is a diagram showing how the arrangement process is performed. 12A and 12B are diagrams showing the arrangement process in the comparative example. FIG. 13 is a diagram showing how the arrangement process is performed. FIG. 14 is a diagram showing how the arrangement process is performed. 15A and 15B are diagrams showing the arrangement process in the comparative example. FIG. 16 is a diagram showing the state of the bonding process. FIG. 17 is a diagram showing a modification of the stacked battery. FIG. 18 is a diagram showing a modification of the stacked battery. FIG. 19 is a diagram showing the manufacturing methods of stacked batteries of Examples 1 to 4 and Comparative Examples 1 to 8, and the evaluation results of Examples 1 to 4 and Comparative Examples 1 to 8.

An embodiment of the present invention will be described below with reference to the drawings. In addition, in the drawings attached to this specification, for the convenience of easy understanding, the scale, the ratio of vertical and horizontal dimensions, etc. are appropriately changed and exaggerated from those of the real thing.

First, an embodiment of a laminated battery according to the present invention will be described. 1 to 7 are diagrams for explaining an embodiment of a stacked battery according to the present invention. FIG. 1 is a perspective view showing a specific example of a laminated battery. The laminated battery 1 includes an electrode body 2, an outer body 3 that houses the electrode body 2, tabs 16 and 26 attached to the electrode body 2, and sealants 18 and 28 attached to the tabs 16 and 26. Prepare.

FIG. 2 is a perspective view showing the electrode body 2 housed in the exterior body 3 in FIG. 1, and the exterior body 3 is indicated by a two-dot chain line. FIG. 3 is a plan view showing the stacked battery 1. FIG. A laminated battery is, for example, a battery including a plurality of laminated electrode plates. Each component of the stacked battery 1 will be described below.

(electrode body)
The electrode body 2 has a plurality of plate members including a plurality of laminated electrode plates. In the example shown in FIGS. 2 and 3, the plate member of the electrode body 2 has first electrode plates 10 and second electrode plates 20 alternately laminated as electrode plates. In this embodiment, an example in which the electrode assembly 2 constitutes a lithium ion secondary battery will be described. In this example, the first electrode plate 10 constitutes the positive electrode plate 10X, and the second electrode plate 20 constitutes the negative electrode plate 20Y. However, as can be understood from the description of the effects described below, the embodiment described here is not limited to the lithium ion secondary battery, and the first electrode plate 10 and the second electrode plate It can be widely applied to the electrode assembly 2 in which 20 are alternately laminated.

FIG. 4 is a cross-sectional view showing the electrode assembly 2. As shown in FIG. As shown in FIGS. 2 to 4, the electrode body 2 has a plurality of positive electrode plates 10X (first electrode plates 10) and negative electrode plates 20Y (second electrode plates 20) as plate members 60. As shown in FIG. The positive plates 10X and the negative plates 20Y are alternately arranged along the stacking direction dL (see FIG. 4). The electrode body 2 and the stack type battery 1 have a flat shape as a whole, are thin in the stacking direction dL, and spread in directions d1 and d2 orthogonal to the stacking direction dL.

In the illustrated non-limiting example, the positive plate 10X and the negative plate 20Y have rectangular contours. The positive electrode plate 10X and the negative electrode plate 20Y have a longitudinal direction in a first direction d1 that is orthogonal to the stacking direction dL and the direction in which the tabs 16 and 26 extend, and are orthogonal to both the stacking direction dL and the first direction d1. It has a short direction in two directions d2. The positive electrode plate 10X and the negative electrode plate 20Y are arranged to be shifted in the first direction d1. More specifically, the plurality of positive plates 10X are arranged closer to one side (upper right side in FIG. 2) in the first direction d1, and the plurality of negative plates 20Y are arranged closer to the other side (upper right in FIG. 2) in the first direction d1. (lower left side of )). The positive electrode plate 10X and the negative electrode plate 20Y overlap each other in the stacking direction dL at the center in the first direction d1.

As illustrated, the positive electrode plate 10X (first electrode plate 10) has a sheet-like outer shape. The positive electrode plate 10X (first electrode plate 10) includes a positive electrode current collector 11X (first electrode current collector 11) and a positive electrode active material layer 12X (first electrode active material layer 12X) provided on the positive electrode current collector 11X. 12) and. In the lithium ion secondary battery, the positive electrode plate 10X releases lithium ions during discharging and absorbs lithium ions during charging.

The positive electrode current collector 11X has, as main surfaces, a first surface 11a and a second surface 11b facing each other. The cathode active material layer 12X is formed on at least one of the first surface 11a and the second surface 11b of the cathode current collector 11X. Specifically, when the first surface 11a or the second surface 11b of the positive electrode current collector 11X forms the outermost surface in the stacking direction dL of the electrode body 2, the surface of the positive electrode current collector 11X has the positive electrode Active material layer 12X is not provided. Except for the configuration related to the arrangement of the positive electrode current collector 11X, the plurality of positive electrode plates 10X included in the stacked battery 1 have the positive electrode active material layers 12X on both sides of the positive electrode current collector 11X and have the same configuration. can be

The positive electrode current collector 11X and the positive electrode active material layer 12X can be produced by various manufacturing methods using various materials that can be applied to the laminated battery 1 (lithium ion secondary battery). As an example, the positive electrode current collector 11X may be made of aluminum foil. The positive electrode active material layer 12X contains, for example, a positive electrode active material, a conductive aid, and a binder that serves as a binder. The positive electrode active material layer 12X is produced by applying a positive electrode slurry obtained by dispersing a positive electrode active material, a conductive aid, and a binder in a solvent onto the material forming the positive electrode current collector 11X and solidifying the slurry. can be As the positive electrode active material, for example, a lithium metal oxide compound represented by the general formula LiM _x O _y (where M is a metal, and x and y are the composition ratio of metal M and oxygen O) is used. Specific examples of the lithium metal oxide compound include lithium cobaltate, lithium nickelate, and lithium manganate. Acetylene black or the like may be used as the conductive aid. Polyvinylidene fluoride or the like may be used as the binder.

As shown in FIGS. 3 and 4, the positive electrode current collector 11X (first electrode current collector 11) has a first connection region a1 and a first effective region b1 adjacent to the first connection region a1. . The positive electrode active material layer 12X (first electrode active material layer 12) is arranged only in the first effective region b1 of the positive electrode current collector 11X. The first connection area a1 and the first effective area b1 are arranged in the longitudinal direction of the positive electrode plate 10X. The first connection area a1 is located outside the first effective area b1 in the longitudinal direction of the positive electrode plate 10X (on the right side in FIG. 3). The plurality of positive electrode current collectors 11X are joined and electrically connected in the first connection region a1 by resistance welding, ultrasonic welding, sticking with tape, fusion bonding, or the like. On the other hand, the first effective region b1 is located within a region of the negative electrode plate 20Y facing the negative electrode active material layer 22Y, which will be described later. Such arrangement of the first effective region b1 can prevent deposition of lithium from the positive electrode active material layer 12X.

Next, the negative electrode plate 20Y (second electrode plate 20) will be described. Similarly to the positive plate 10X, the negative plate 20Y also has a sheet-like outer shape. The negative electrode plate 20Y (second electrode plate 20) includes a negative electrode current collector 21Y (second electrode current collector 21) and a negative electrode active material layer 22Y (second electrode active material layer) provided on the negative electrode current collector 21Y. 22) and In the lithium ion secondary battery, the negative electrode plate 20Y absorbs lithium ions during discharging and releases lithium ions during charging.

The negative electrode current collector 21Y has a first surface 21a and a second surface 21b facing each other as main surfaces. The negative electrode active material layer 22Y is formed on at least one of the first surface 21a and the second surface 21b of the negative electrode current collector 21Y. A plurality of negative electrode plates 20Y included in the laminate type battery 1 can have the same configuration as one having a pair of negative electrode active material layers 22Y provided on both sides of the negative electrode current collector 21Y.

The negative electrode current collector 21Y and the negative electrode active material layer 22Y can be produced by various manufacturing methods using various materials that can be applied to the laminated battery 1 (lithium ion secondary battery). As an example, the negative electrode current collector 21Y is made of copper foil, for example. The negative electrode active material layer 22Y contains, for example, a negative electrode active material made of a carbon material and a binder that functions as a binder. The negative electrode active material layer 22Y is formed by dispersing a negative electrode slurry in which a negative electrode active material such as carbon powder or graphite powder and a binder such as polyvinylidene fluoride are dispersed in a solvent to form the negative electrode collector 21Y. It can be made by coating on a material and solidifying it.

As shown in FIGS. 3 and 4, the negative electrode current collector 21Y (second electrode current collector 21) has a second connection region a2 and a second effective region b2 adjacent to the second connection region a2. . The negative electrode active material layer 22Y (second electrode active material layer 22) is arranged in the second effective region b2 of the negative electrode current collector 21Y. The second connection area a2 and the second effective area b2 are arranged in the longitudinal direction of the negative electrode plate 20Y. The second connection area a2 is located outside the second effective area b2 in the longitudinal direction of the negative electrode plate 20Y (left side in FIG. 3). The plurality of negative electrode current collectors 21Y are joined and electrically connected in the second connection region a2 by resistance welding, ultrasonic welding, sticking with a tape, fusion bonding, or the like. On the other hand, the second effective region b2 extends over the region facing the positive electrode active material layer 12X of the positive electrode plate 10X.

As shown in FIG. 4, at least one of the positive electrode plate 10X (first electrode plate 10) and the negative electrode plate 20Y (second electrode plate 20) may have the insulating layer 30. FIG. The insulating layer 30 prevents a short circuit between the positive electrode plate 10X (first electrode plate 10) and the negative electrode plate 20Y (second electrode plate 20). In the illustrated example, the negative electrode plate 20Y has the insulating layer 30 . The insulating layer 30 is provided so as to cover the pair of negative electrode active material layers 22Y included in each negative electrode plate 20Y. The surface of the negative electrode plate 20Y facing the positive electrode active material layer 12X of the positive electrode plate 10X in the stacking direction dL is formed by the insulating layer 30. As shown in FIG. However, instead of the illustrated insulating layer 30 or in addition to the illustrated insulating layer 30, an insulating layer 30 that covers the pair of positive electrode active material layers 12X included in each positive electrode plate 10X can be installed.

In the illustrated example, insulating layer 30 also functions as electrolyte layer 30A. The electrolyte layer 30A (insulating layer 30) is a layer formed by solidifying or gelling an electrolytic solution applied on the active material layers 22Y and 12X on the active material layers 22Y and 12X. As the electrolyte, for example, a polymer matrix and a non-aqueous electrolyte (i.e., a non-aqueous solvent and an electrolyte salt) that are gelled to give a sticky surface, or a polymer matrix and a non-aqueous solvent. , a solid electrolyte can be used. A specific material for producing the electrolyte layer 30A (insulating layer 30) is not particularly limited, and various materials used for forming them (for example, disclosed in Japanese Patent Application Laid-Open No. 2012-190567). material) can be used.

In the example shown in FIG. 4, the electrode body 2 further includes an insulator 61 as the plate member 60 in addition to the positive electrode plate 10X (first electrode plate 10) and the negative electrode plate 20Y (second electrode plate 20). The insulator 61 prevents a short circuit between the positive electrode plate 10X (first electrode plate 10) and the negative electrode plate 20Y (second electrode plate 20). In the example shown in FIG. 4, the insulator 61 is positioned between the alternately stacked positive electrode plates 10X and negative electrode plates 20Y. The insulator 61 is a plate-like member containing, for example, polyethylene, polypropylene, a fluorine-based compound, or aramid fiber. In the example shown in FIG. 3, the outline of the insulator 61 included in the electrode body 2 is indicated by a dashed line. In the non-limiting example shown in FIG. 3, insulator 61 has a rectangular contour.

(tab)
Tabs 16 and 26 are electrically connected to at least one of the plurality of electrode plates. In the example shown in FIG. 2, the tabs 16 and 26 have a first tab 16 electrically connected to the positive plate 10X and a second tab 26 electrically connected to the negative plate 20Y. As shown in FIG. 2, the first tab 16 is electrically connected to the positive current collector 11X. Further, as shown in FIG. 2, the second tab 26 is electrically connected to the negative electrode current collector 21Y. The first tab 16 functions as a positive terminal in the laminated battery 1 , and the second tab 26 functions as a negative terminal in the laminated battery 1 .

Tabs 16, 26 have a first surface and a second surface opposite the first surface. In the example shown in FIG. 5, a plate-like first tab 16 having a first surface 161 and a second surface 162 is shown. Tabs 16 and 26 also have a first edge and a second edge facing the first edge. FIG. 6 is a plan view showing a portion surrounded by a dashed line labeled VI in FIG. 3 as viewed from the side of the positive electrode plate 10X to which the first tab 16 is attached. In addition, in FIG. 6, the exterior body 3 is represented by the two-dot chain line. In the example shown in FIG. 6, the first tab 16 has a rectangular shape in plan view, and includes a first edge 16a, a second edge 16b facing the first edge 16a, and a first edge 16a. And a third edge 16c extending in a direction intersecting the extending direction of the second edge 16b, and a direction facing the third edge 16c and intersecting the extending direction of the first edge 16a and the second edge 16b and an extending fourth edge 16d. Although not shown, the second tab 26 has a rectangular shape in a plan view, and has a first edge, a second edge opposite to the first edge, and the first edge and the second edge. a third side extending in a direction intersecting the direction in which the side extends; and a fourth side facing the third side and extending in a direction intersecting the direction in which the first side and the second side extend. . In this embodiment, the tabs 16 and 26 have first and second edges extending in the second direction d2, and third and fourth edges extending in the first direction d1.

FIG. 7 is an enlarged cross-sectional view of a portion surrounded by a dashed line labeled VII in FIG. The tabs 16 and 26 face the electrode body 2 on the first surface side and are connected to the electrode plate so that the first edge overlaps the electrode body 2 . In the example shown in FIGS. 6 and 7, the first tab 16 faces the electrode body 2 on the first surface 161 side, and the positive electrode collector of the positive electrode plate 10X is arranged such that the first edge 16a overlaps the electrode body 2. It is connected to the electric body 11X. Although not shown, the second tab 26 is connected to the negative electrode current collector 21Y of the negative electrode plate 20Y so that the first surface side faces the electrode body 2 and the first end side overlaps the electrode body 2. It is In the examples shown in FIGS. 5, 6 and 7, the first tab 16 is connected to the first surface 11a (upper surface) of the positive electrode current collector 11X located closest to the first tab 16 in the first connection region a1. ing. Although not shown, the second tab 26 is also connected to the first surface 21a (upper surface) of the negative electrode current collector 21Y located closest to the second tab 26 in the second connection area a2.

The method of electrically connecting the tabs 16, 26 and the electrode plate is arbitrary as long as the tabs 16, 26 and the electrode plate can be electrically connected. For example, the tabs 16, 26 are electrically connected to the electrode plates by being welded to at least one of the plurality of electrode plates on the first surface side. In the example shown in FIGS. 6 and 7, the first tab 16 is welded to the positive current collector 11X of the positive electrode plate 10X on the first surface 161 side. Although not shown, the second tab 26 is welded to the negative electrode current collector 21Y of the negative electrode plate 20Y on the first surface side. A hatched region denoted by reference numeral 40 in FIG. 6 indicates a region where the first tab 16 is welded to the positive electrode plate 10X in plan view.

Tabs 16 and 26 may be formed using metal members such as aluminum, nickel, copper alloys, or nickel-plated copper, for example. For example, when the positive electrode current collector 11X is made of aluminum foil and the negative electrode current collector 21Y is made of copper foil, aluminum is used to form the first tab 16, and copper alloy is used to form the second tab. 26 can be formed. Although not shown, the tabs 16 and 26 may have a metal member and a coating provided on the surface of the metal member to suppress corrosion of the metal member. The material of the coating provided on the surface of the metal member includes, for example, zirconium, nickel, or zinc. Tabs 16 and 26 have a thickness of, for example, 100 μm or more. A thickness W2 of the tabs 16 and 26 shown in FIG. 7 is, for example, 200 μm or more and 2000 μm or less. When the tabs 16 and 26 have the above thicknesses, it becomes easy to take out a particularly large current from the stacked battery 1 via the tabs 16 and 26 .

The tabs 16 and 26 are curved so as to be concave toward the first surface between the first edge and the second edge. In the example shown in FIG. 5, the first tab 16 extends toward the first surface 161 between the first side 16a and the second side 16b, with a straight line extending in the direction in which the first side 16a extends. It is curved to be concave.

Tabs 16, 26 include projections located at least on the first edges and projecting from the first surface. In the example shown in Figures 5 and 7, the first tab 16 includes a protrusion 50 located at the first edge 16a. The protrusion 50 of the first tab 16 protrudes from the first surface 161 toward the side away from the second surface 162 of the first tab 16 . Also, although not shown, the second tab 26 includes a protrusion 50 on the first edge. The protrusion 50 of the second tab 26 protrudes from the first surface away from the second surface of the second tab 26 .

The protrusions 50 may be located on the first and second edges of the tabs 16,26. In the example shown in FIG. 5, the first tab 16 includes a protrusion 50 located at the first edge 16a and a protrusion 50 located at the second edge 16b. Also, although not shown, the second tab 26 may include the protrusion 50 located on the first edge and may include a protrusion located on the second edge. In the following description, the protrusions 50 positioned at the first edges of the tabs 16 and 26 are also referred to as first protrusions 51 . Also, the protrusion 50 positioned on the second edge of the tabs 16 and 26 is also referred to as a second protrusion 52 .

A height W1 of the protrusion 50 shown in FIG. 7 is, for example, 0.1 to 0.9 times the thickness W2 of the tabs 16 and 26 . Also, the height W1 of the protrusion 50 may be 20 μm or more and 180 μm or less. A definition of the height W1 of the protrusion 50 will be described. Note that the positive electrode plate 10X positioned closest to the first tab 16 among the plurality of positive electrode plates 10X is hereinafter also referred to as the first positive electrode plate 10X1. Further, among the plurality of negative electrode plates 20Y, the negative electrode plate 20Y positioned closest to the second tab 26 is hereinafter also referred to as a first negative electrode plate. Here, in the laminate type battery 1, the height W1 of the protrusion 50 is, for example, when the protrusion 50 is positioned at a portion overlapping the first connection region a1 of the electrode body 2 of the first tab 16, the height W1 is as follows. is defined as First, as shown in FIG. 7, consider a virtual surface 10a obtained by extending the surface of the first positive electrode plate 10X1 on the first tab 16 side in the first connection area a1. In this case, the distance between the surface 10a and the tip of the protrusion 50 can be the height W1 of the protrusion 50. FIG. Similarly, when the projecting portion 50 is located in a portion of the second tab 26 that overlaps the second connection region a2 of the electrode body 2, the surface of the first negative plate in the second connection region a2 on the second tab 26 side can be defined as the height of the protrusion 50 .

The relationship between the protrusions 50 of the tabs 16 and 26 and the electrode plates will be described. In the present embodiment, of the electrode plates on which the tabs 16 and 26 at least partially overlap, the electrode plate closest to the tabs 16 and 26 is penetrated by the protrusion 50 . In the example shown in FIG. 7, the first tab 16 partially overlaps the plurality of positive electrode plates 10X. The plurality of positive electrode plates 10X includes a first positive electrode plate 10X1 located closest to the first tab 16, a second positive electrode plate 10X2 located on the side of the first positive electrode plate 10X1 away from the first tab 16, and a second positive electrode plate 10X2. and a third positive electrode plate 10X3 located on the side of the positive electrode plate 10X2 away from the first tab 16. Then, as shown in FIG. 7 , the first projection 51 of the first tab 16 penetrates the first positive electrode plate 10X1. Although not shown, the second tab 26 partially overlaps the plurality of negative electrode plates 20Y, and the first negative plate positioned closest to the second tab 26 among the plurality of negative plates 20Y is the second tab 26. The first protrusion 51 of the tab 26 is penetrated. The protrusion 50 may penetrate a plurality of electrode plates including the electrode plate located closest to the tabs 16 and 26 among the electrode plates on which the tabs 16 and 26 at least partially overlap. In the example shown in FIG. 7, the first protrusion 51 of the first tab 16 penetrates the two positive electrode plates 10X, ie, the first positive electrode plate 10X1 and the second positive electrode plate 10X2.

Of the electrode plates on which the tabs 16 and 26 at least partially overlap, the electrode plate (first positive electrode plate 10X1, first negative electrode plate) positioned closest to the tabs 16 and 26 is penetrated by the protrusion 50. , the connection between the tabs 16 and 26 and the electrode plate can be made stronger. For this reason, in the stack type battery 1 having an electrode plate with a particularly large area, which is expected to be deformed by bending the stack type battery 1 during use, the deformation of the stack type battery 1 does not affect the deformation. Along with this, it is possible to prevent the tabs 16 and 26 from coming off the electrode plate. Here, the laminated battery 1 having an electrode plate with a large area is, for example, a laminated battery 1 with an electrode plate having an area of 200 cm ² or more and 1200 cm ^{2 or} less.

(sealant)
The sealants 18 and 28 are members made of a material that can be welded to the exterior body 3 . Examples of materials for the sealants 18 and 28 include polypropylene, modified polypropylene, low-density polypropylene, ionomer, and ethylene/vinyl acetate. The thickness of the sealants 18, 28 is, for example, 0.05 mm or more and may be 0.4 mm or less.

The sealants 18 , 28 have a first sealant 18 positioned between the first tab 16 and the armor 3 and a second sealant 28 positioned between the second tab 26 and the armor 3 . As shown in FIG. 5 , a first sealant 18 is interposed between the outer body 3 and the first tab 16 in the sealing region 7 . Also, although not shown, a second sealant 28 is interposed between the exterior body 3 and the second tab 26 . As a result, the exterior body 3 can be more firmly sealed around the tabs 16 and 26 . In addition, it is possible to prevent a short circuit between the tabs 16 and 26 and the metal foil such as aluminum foil or stainless steel foil included in the outer package 3 .

(Exterior body)
The exterior body 3 is a packaging material for sealing the electrode body 2 from the outside. As shown in FIG. 1 , the exterior body 3 has a sheet-like first member 4 positioned above the electrode body 2 and a sheet-like second member 5 positioned below the electrode body 2 . The first member 4 and the second member 5 are joined together along the outer edge so as to surround the electrode body 2 in plan view.

In the following description, a region of the exterior body 3 defining a housing space 6a for housing the electrode body 2 between the first member 4 and the second member 5 is also referred to as a housing region 6. As shown in FIG. A region of the exterior body 3 located on the outer periphery of the housing region 6 and where the first member 4 and the second member 5 are joined is also referred to as a sealing region 7 . In FIG. 3, the sealing area 7 is indicated by hatching.

The 1st member 4 and the 2nd member 5 of the exterior body 3 are demonstrated. In the example shown in FIG. 1, the first member 4 includes, in the housing area 6, a side surface portion 41 that protrudes with respect to the sealing area 7, and a center portion that is connected to the side surface portion 41 and overlaps the electrode body 2 in the stacking direction dL. a portion 42; Moreover, in the example shown in FIG. 1, the second member 5 is a flat member extending in the first direction d1 and the second direction d2. As shown in FIG. 5, the first member 4 includes a base material 4a and a thermoplastic resin layer 4b located closer to the housing space 6a than the base material 4a. Similarly, the second member 5 includes a base material 5a and a thermoplastic resin layer 5b positioned closer to the housing space 6a than the base material 5a.

The substrates 4a and 5a are provided with rigid plastic films such as nylon and PET (polyethylene terephthalate). The substrates 4a and 5a may further comprise a metal foil located closer to the accommodation space 6a than the plastic film. Examples of metal foil include aluminum foil and stainless steel foil.

The thermoplastic resin layers 4b and 5b are layers containing a thermoplastic resin. As shown in FIG. 5, the thermoplastic resin layers 4b and 5b in the region where the sealant 18 is located in the sealing region 7 are melted by being heated to join the sealant 18 and the exterior body 3. forming part 8. Further, although not shown, the thermoplastic resin layers 4b and 5b in the region where the sealant 28 is located in the sealing region 7 are melted by being heated to join the exterior body 3 and the sealant 28. forming a department. Also, although not shown, the thermoplastic resin layers 4b and 5b in the sealing region 7, in the regions where the sealants 18 and 28 are not located, are melted by being heated to separate the first member 4 and the second member 5 from each other. forming a joint that joins the Examples of thermoplastic resins include polypropylene, modified polypropylene, low-density polypropylene, ionomer, and ethylene/vinyl acetate.

The exterior body 3 partially extends the tabs 16 and 26 inside such that the first edges of the tabs 16 and 26 are positioned inside the exterior body 3 and the second edges extend outside the exterior body 3 . are accommodated. In the example shown in FIGS. 5 and 6 , the outer body 3 is arranged such that the first edge 16 a of the first tab 16 is positioned inside the outer body 3 and the second edge 16 b extends outside the outer body 3 . Additionally, the first tab 16 is partially housed therein. 2, 5 and 6, the tabs 16 and 26 pass between the first member 4 and the second member 5 of the exterior body 3 from the inside of the exterior body 3. In the example shown in FIGS. The tabs 16 and 26 are partially accommodated inside so as to extend outward in the first direction d1.

In this embodiment, the tabs 16 and 26 are curved so as to be concave toward the flat second member 5 side of the exterior body 3 . In order to explain the effects of the stacked battery 1 in this case, after placing the stacked battery 1 and the external member 74, which is a member different from the stacked battery 1, on the support surface 73a, the tabs 16 and 26 are attached. Consider welding to an external member 74 . FIG. 8 is a diagram showing an example of how the first tab 16 is welded to the external member 74. As shown in FIG. In the example shown in FIG. 8, the stack type battery 1 is arranged so that the support plate 73 having the support surface 73a is positioned on the second member 5 side of the stack type battery 1 . Further, the external member 74 is arranged so as to be positioned between the portion of the first tab 16 positioned outside the exterior body 3 and the support plate 73 . In this case, while supporting the first tab 16 and the external member 74 by the supporting surface 73a, the welding tool 71 is used to press the second surface 162 side of the first tab 16, thereby separating the first tab 16 and the external member 74. The first tab 16 can be welded to the outer member 74 by melting with contact. Further, as shown in FIG. 8, by arranging the laminated battery 1 so that the support plate 73 is positioned on the flat second member 5 side, the support plate 73 is positioned on the first member 4 side. The stack type battery 1 can be brought into contact with the support surface 73a over a wider range than when arranged. Therefore, when the tabs 16 and 26 are welded to the external member 74, it is possible to suppress the stack-type battery 1 from shifting with respect to the support surface 73a.

Here, in this embodiment, the tabs 16 and 26 are curved so as to be concave toward the second member 5 side. Therefore, when the laminated battery 1 and the external member 74 are arranged on the support surface 73a as shown in FIG. The distance W3 between the second ends of the tabs 16, 26 and the outer member 74 can be made shorter than that. In this case, the welding tool 71 is used to press the second surface side of the tabs 16, 26 to bring the tabs 16, 26 and the external member 74 into contact with each other. It is possible to further reduce the pressing force of the welding tool 71 required for .

Next, a method for manufacturing the laminated battery 1 according to the present embodiment configured as a lithium ion secondary battery will be described. The manufacturing method of the laminated type battery described below includes a joining step of joining the tabs 16 and 26 to at least one of the plurality of electrode plates of the electrode body 2 and a housing step of housing the electrode body 2 inside the exterior body 3. And prepare. The method of manufacturing the stacked battery may further include an arrangement step of arranging the tabs 16 and 26 before the bonding step. Each step will be described below. In the following, as an example of the bonding process and the arranging process, the process of bonding the first tab 16 to the electrode plate and the process of arranging the first tab 16 will be described. It also applies to the second tab 26 unless otherwise specified.

(Placement process)
In the arranging step, tabs 16 and 26 are arranged so that tabs 16 and 26 are partially located on electrode body 2 and face electrode body 2 on the first surface side. First, the tabs 16 and 26 arranged in the arrangement process will be described. FIG. 9 is a cross-sectional view showing the first tab 16 arranged in the arrangement step. In the example shown in FIG. 9, a first sealant 18 is provided around the first tab 16 . As shown in FIG. 9, the first tab 16 is arranged between the first side 16a and the second side 16b during the arrangement process, with the straight line extending in the direction in which the first side 16a extends. , is curved so as to be concave toward the first surface 161 side. Also, the first tab 16 includes the protrusion 50 (first protrusion 51) positioned at the first edge 16a even during the placement process. Also, the first tab 16 includes the projection 50 (the second projection 52) located on the second edge 16b even during the placement process. Before the bonding process described later, such as during the arranging process, the height of the protrusion 50 is, for example, 0.1 to 0.9 times the thickness of the tabs 16 and 26 . In addition, the height of the protrusion 50 may be 20 μm or more and 180 μm or less before the joining step described later.

The first tab 16 shown in FIG. 9 is produced, for example, by the following method. First, as shown in FIG. 10, the end of a rolled metal sheet 91, which is the material of the first tab 16, is extended over the support plate 92. As shown in FIG. At this time, a guide roller 94 or the like shown in FIG. 10 may be used to adjust the direction in which the metal sheet 91 extends. Next, a cutting blade 93 is used to cut the metal sheet 91 extending over the support plate 92 . As a result, the first tab 16 having the first side 16a and the second side 16b where the metal sheet 91 is cut is produced. In addition, by cutting the metal sheet 91 with a cutting blade 93 from the side of the first tab 16 that will become the second surface 162, the first edge 16a and the second edge 16b of the first tab 16 are cut. A protrusion 50 is formed as a burr protruding from one surface 161 . In this case, when the metal sheet 91 that is the material of the first tab 16 and the first tab 16 has a particularly large thickness, for example, a thickness of 100 μm or more, the first edge 16 a and the second edge of the first tab 16 A particularly large burr is likely to be formed on the side 16b. In the example shown in FIG. 10, the metal sheet 91 is wound into a roll so that the first surface 161 of the first tab 16 is inside and the second surface 162 is outside. Therefore, the first tab 16 is recessed toward the first surface 161 between the first edge 16a and the second edge 16b, corresponding to the shape of the metal sheet 91 wound in a roll. curved like this. In this case, when the first tab 16 and the metal sheet 91 that is the material of the first tab 16 have a particularly large thickness, for example, a thickness of 100 μm or more, the first tab 16 has a shape corresponding to the shape of the metal sheet 91 . Remarkable curvature tends to remain.

In the positioning step, the tabs 16, 26 are positioned so that the tabs 16, 26 partially rest on the electrode body 2 placed on the support surface and face the electrode body 2 on the first surface side. . FIG. 11 shows that, in the placement step, the first tab 16 is partially positioned on the electrode body 2 placed on the support surface 72a of the support 72, and the first tab 16 faces the electrode body 2 on the first surface 161 side. , and shows how the first tab 16 is arranged. In the example shown in FIG. 11 , the first tab 16 is arranged such that the protrusion 50 (first protrusion 51 ) located on the first edge 16 a is in contact with the electrode body 2 .

In the arranging step, the tabs 16 and 26 are arranged so that the tabs 16 and 26 face the electrode body 2 placed on the support surface 72a on the first surface side. I will explain from As a comparative example, consider a case where the tabs 16 and 26 are arranged so that the tabs 16 and 26 face the electrode body 2 placed on the support surface 72a on the second surface side. In this case, since the tabs 16 and 26 are curved so as to be concave toward the first surface 161 between the first edge and the second edge, when the tabs 16 and 26 are arranged, The first edges of tabs 16 and 26 are less likely to come into contact with the electrode plate. FIG. 12 is a diagram showing a state in which the first tab 16 is arranged so that the first tab 16 faces the electrode body 2 placed on the support surface 72a on the second surface 162 side in the comparative example. . In the example shown in FIG. 12, the first edge 16a of the first tab 16 is not in contact with the electrode plate and is separated from the electrode plate.

On the other hand, in the manufacturing method of the laminated type battery according to the present embodiment, the tabs 16 and 26 are arranged so that the tabs 16 and 26 face the electrode body 2 placed on the support surface 72a on the first surface side. 26 is placed. This makes it possible to shorten the distance between the first edges of the tabs 16 and 26 and the electrode plate when the tabs 16 and 26 are arranged. In particular, the first edges of the tabs 16, 26 can be easily brought into contact with the electrode plate. As a result, for example, in the joining process described later, when the second surfaces of the tabs 16 and 26 are brought into contact with a welding tool to weld the tabs 16 and 26 to the electrode plate, the first edges of the tabs 16 and 26 are not in contact with the electrode plate. Displacement with respect to the body 2 can be suppressed. In particular, by arranging the tabs 16 and 26 so that the first protrusion 51 contacts the electrode body 2 in the arranging step, the first edges of the tabs 16 and 26 are displaced from the electrode body 2 in the joining step. can be made easier to control.

A method of moving the tabs 16, 26 when arranging the tabs 16, 26 in the arranging process will be described. In the present embodiment, tabs 16 and 26 are arranged by moving the suction portion that is attracted to the second surface side of tabs 16 and 26 . FIG. 13 is a view showing a part of the first tab 16 on the side of the first edge 16a and a suction portion 80 that can be suctioned to the second surface 162 of the first tab 16. As shown in FIG. FIG. 14 is a diagram showing how the adsorption portion 80 is adsorbed to the second surface 162 of the first tab 16. As shown in FIG. The form of the adsorption portion 80 is not particularly limited as long as the adsorption portion 80 can be adsorbed to the second surface side of the tabs 16 and 26 . In the example shown in FIGS. 13 and 14 , the suction part 80 includes a wall surface 81 that contacts the second surface 162 of the first tab 16 and suction holes 82 defined by the wall surface 81 . The adsorption unit 80 shown in FIG. 13 is configured such that the inside of the adsorption holes 82 can be decompressed by exhausting the air inside the adsorption holes 82 . Also, the suction unit 80 can be moved by, for example, a driving unit (not shown).

A method of arranging the first tab 16 using the adsorption portion 80 shown in FIGS. 13 and 14 is as follows, for example. First, as shown in FIG. 14 , the suction portion 80 is moved so that the tip of the wall surface 81 contacts the second surface 162 of the first tab 16 and the suction hole 82 is closed by the first tab 16 . In the example shown in FIG. 13, the adsorption part 80 is moved so as to bring the wall surface 81 into contact with the second surface 162 of the first tab 16 where the first sealant 18 is not provided. Here, when the first tab 16 is curved as shown in FIG. The tip is deformed so that it contacts the second surface 162 of the first tab 16 and the suction hole 82 is closed by the first tab 16 . Next, the pressure inside the adsorption hole 82 is reduced. Thereby, the adsorption portion 80 can be adsorbed to the second surface 162 of the first tab 16 . Next, the first tab 16 is moved to the position where the first tab 16 is to be arranged by moving the adsorption part 80 while the adsorption part 80 is adsorbed to the second surface 162 of the first tab 16 . Next, the decompression inside the suction hole 82 is stopped, and the suction portion 80 is detached from the second surface 162 of the first tab 16 . Thereby, the first tab 16 can be arranged as shown in FIG.

In the arrangement step, the effect of causing the suction portion 80 to adhere to the second surface side of the tabs 16 and 26 will be described in comparison with a comparative example. As a comparative example, consider a case where the suction portion 80 is suctioned to the first surface side of the tabs 16 and 26 that are curved so as to be concave toward the first surface side. 15A and 15B are diagrams showing how the suction portion 80 is attracted to the first surface 161 side of the first tab 16 in the comparative example. In the case of the comparative example, in order to cause the suction portion 80 to adhere to the first surfaces of the tabs 16 and 26, the tip of the wall surface 81 is pressed against the first surfaces of the tabs 16 and 26 so that the tip of the wall surface 81 is brought into contact with the tab 16. , 26 and deform the tabs 16, 26 so that the suction holes 82 are occluded by the tabs 16, 26. As shown in FIG. In the case of the comparative example, when the tabs 16 and 26 are deformed and are attracted to the suction portion 80, the force with which the deformed tabs 16 and 26 try to return to their original shapes is It is thought that it acts so as to create a gap between it and the tip of the wall surface 81 .

On the other hand, in the manufacturing method of the laminated type battery according to the present embodiment, the adsorption portion 80 is adsorbed to the second surface side of the tabs 16 and 26 which are curved so as to be concave toward the first surface side. Let In this case, the tabs 16 and 26 are deformed so that the suction holes 82 are closed by the tabs 16 and 26, and when the suction portion 80 is attracted to the second surface side of the tabs 16 and 26, the deformed tabs 16 and 26 are moved. It is possible to suppress the force that causes 26 to return to its original shape from acting to create a gap between the tabs 16 and 26 and the tip of the wall surface 81 . As a result, it is possible to reduce the pressure inside the suction holes 82 while maintaining the state where the suction holes 82 are closed by the tabs 16 and 26 , so that the tabs 16 and 26 can strongly adhere the suction portions 80 . Therefore, when the tabs 16 and 26 are moved by moving the adsorption section 80 and the tabs 16 and 26 are arranged, it is possible to prevent the tabs 16 and 26 from being unintentionally detached from the adsorption section 80. can.

(Joining process)
In the bonding step, the tabs 16, 26 provided with the sealants 18, 28 are bonded to at least one of the plurality of stacked electrode plates so that the tabs 16, 26 are electrically connected to the electrode plate. do. FIG. 16 shows how the first tab 16 is joined to the positive electrode plate 10X in the joining step. In the joining step, as shown in FIG. 16, the tabs 16 and 26 are placed on the electrode plate so that the tabs 16 and 26 face the electrode body 2 on the first surface side and overlap the electrode body 2 on the first edge side. join to

In this embodiment, the tabs 16, 26 are joined to the electrode plate by welding the tabs 16, 26 to the electrode plate. Specifically, the tabs 16,26 are welded to the electrode plate by contacting the second side of the tabs 16,26 with a welding tool. In the example shown in FIG. 16 , the welding tool 71 is brought into contact with the second surface 162 of the first tab 16 . As a result, the first tab 16 and the positive electrode plate 10X are melted, and the first tab 16 is welded to the positive electrode plate 10X. In this case, the method of welding the first tab 16 to the positive electrode plate 10X is not particularly limited, but may be ultrasonic welding or resistance welding, for example. For example, when the first tab 16 is welded to the positive electrode plate 10X by ultrasonic welding, the welding tool 71 is a device that applies ultrasonic vibrations to a region where the first tab 16 is welded to the positive electrode plate 10X. When bringing the welding tool 71 into contact with the second surface 162 of the first tab 16 , the welding tool 71 may press the second surface 162 of the first tab 16 . In the present embodiment, the first tab 16 is welded to the first connection region a1 of the positive electrode current collector 11X by melting the first tab 16 and the first connection region a1 of the positive electrode current collector 11X. This electrically connects the first tab 16 to the positive electrode current collector 11X.

When joining the first tab 16 to the positive electrode plate 10X in the joining step, the first surface 161 of the first tab 16 and the first surface 11a of the first positive electrode plate 10X1 are brought close to each other. In the example shown in FIG. 7, the first surface 161 of the first tab 16 and the first surface 11a of the first positive electrode plate 10X1 are in contact by joining the tabs 16 and 26 to the positive electrode plate 10X. By bringing the first surface 161 of the first tab 16 closer to the first surface 11a of the first positive electrode plate 10X1, the first protrusion 51 of the first tab 16 is pressed against the positive electrode plate 10X, as shown in FIG. Thus, the first protrusion 51 penetrates the single or multiple positive plates 10X including at least the first positive plate 10X1. Further, for example, when the first tab 16 is welded to the positive electrode plate 10X using the welding tool 71, the welding tool 71 presses the second surface 162 of the first tab 16, so that the first protrusion 51 is moved to the positive electrode plate 10X. The first protrusion 51 may penetrate the positive electrode plate 10X by being pressed against the plate 10X.

In the joining step, the tabs 16 and 26 are joined to the electrode body 2 so that the tabs 16 and 26 face the electrode body 2 on the first surface side and the first edge overlaps the electrode body 2. will be explained. In the method of manufacturing a laminated battery according to the present embodiment, tabs 16 and 26 are located at least on the first edge and include projecting portion 50 projecting from the first surface. In this case, if the projecting portion 50 located at the first edge comes into contact with the exterior body 3 from the inside of the exterior body 3 , the projecting portion 50 may damage the exterior body 3 . In particular, when the protrusion 50 breaks the thermoplastic resin layers 4b and 5b of the exterior body 3, the thermoplastic resin layers 4b and 5b may be damaged. In this case, particularly when the laminated battery is a lithium-ion secondary battery and the metal contained in the base materials 4a and 5a of the exterior body 3 is aluminum, the electrolyte solution containing lithium in the housing space 6a is used as the base. There is a possibility that liquid junction will occur with the aluminum of the materials 4a and 5a, and aluminum and lithium will be alloyed. In this case, the sealing reliability of the laminated battery may be lowered, and the life of the laminated battery may be shortened.

In the joining step, the tabs 16 and 26 are joined to the electrode body 2 so that the tabs 16 and 26 face the electrode body 2 on the first surface side and the first edge overlaps the electrode body 2, thereby manufacturing In the stacked battery, the protrusion 50 positioned on the first edge can face the side on which the electrode assembly 2 is positioned. As a result, it is possible to prevent the projecting portion 50 positioned at the first edge from coming into contact with the exterior body 3 from the inside of the exterior body 3 and damaging the exterior body 3 . In particular, it is possible to prevent the protrusions 50 positioned on the first edge from breaking the thermoplastic resin layers 4 b and 5 b of the exterior body 3 . For this reason, for example, the components in the housing space 6a and the components forming the base materials 4a and 5a of the exterior body 3 react with each other. reaction can be suppressed. This suppresses adverse effects on the characteristics of the laminated battery 1 such as sealing reliability and life due to reaction between the components in the housing space 6a and the components forming the base materials 4a and 5a of the exterior body 3. be able to.

(Accommodation process)
In the housing step, the electrode body 2 is housed inside the exterior body 3, and the tab is arranged so that the first side is located inside the exterior body 3 and the second side is located outside the exterior body 3. 16 and 26 are partially housed inside the exterior body 3 . In the accommodation step, first, the electrode body 2 with the tabs 16 and 26 joined to the electrode plate is arranged between the first member 4 and the second member 5 . Next, with the first edges of the tabs 16 and 26 located inside the exterior body 3 and the second edges located outside the exterior body 3 , the tabs 16 and 26 are attached to the peripheral edges of the first member 4 and the second member 5 . Along the line, the inner surface of the first member 4 and the inner surface of the second member 5 are joined by heat welding or the like to form the sealing region 7 . Thereby, as shown in FIG. 1, the electrode body 2 can be housed inside the exterior body 3 . Moreover, in the housing step, the electrolytic solution may be supplied to the interior of the exterior body 3 . The supply of the electrolytic solution to the inside of the exterior body 3 is performed, for example, as follows. First, when joining the inner surface of the first member 4 and the inner surface of the second member 5 along the peripheral edges of the first member 4 and the second member 5, part of the peripheral edges of the first member 4 and the second member 5 , an opening where the inner surface of the first member 4 and the inner surface of the second member 5 are not joined is left. Next, an electrolytic solution is supplied between the first member 4 and the second member 5 through the opening. Finally, the inner surface of the first member 4 and the inner surface of the second member 5 are joined at the opening. By the above method, the electrode body 2 is housed inside the exterior body 3 and the electrolytic solution is supplied, and then the exterior body 3 can be sealed.

In the manufacturing method of the laminated type battery according to the present embodiment, in the accommodating step, the tabs 16 and 26 are partially attached to the outer body 3 so that the second edges of the tabs 16 and 26 are positioned outside the outer body 3 . Housed inside 3. Therefore, even if the tabs 16 and 26 include the protrusions 50 located at the second edges, the protrusions 50 located at the second edges come into contact with the exterior body 3 from the inside of the exterior body 3 . Damage to the exterior body 3 can be suppressed.

The method for manufacturing a stacked battery according to the present embodiment can be performed, for example, using a stacked battery manufacturing apparatus that includes a bonding device that performs a bonding step and a housing device that performs a housing step. The stack-type battery manufacturing apparatus may further include an arranging device that performs an arranging step. The arranging device is, for example, a device including the adsorption unit 80 . A welding device is, for example, a device including a welding tool 71 . The housing device is, for example, a device including a heat sealer that joins the inner surface of the first member 4 and the inner surface of the second member 5 by thermal welding.

Although one embodiment has been described above with reference to specific examples, the above-described specific examples are not intended to limit one embodiment. The embodiment described above can be implemented in various other specific examples, and various omissions, replacements, and modifications can be made without departing from the spirit of the embodiment.

An example of modification will be described below with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding portions in the above-described specific example are used for the portions that can be configured in the same manner as in the above-described specific example, and redundant description is given. omitted.

(Modified Example of Stacked Battery)
In the above-described embodiment, of the electrode plates on which the tabs 16 and 26 at least partially overlap, the electrode plate closest to the tabs 16 and 26 (the first positive electrode plate 10X1 and the first negative electrode plate) is the protrusion. 50 is shown showing a stacked battery that is perforated. However, the relationship between the protrusions 50 of the tabs 16 and 26 and the electrode plates in the stacked battery is not limited to this. In this modification, of the electrode plates on which the tabs 16 and 26 at least partially overlap, the electrode plate located closest to the tabs 16 and 26 (the first positive plate 10X1 and the first negative plate) passes through the protrusion 50. is not recessed and has a recess for receiving the protrusion 50 . As an example of the relationship between the protrusions 50 of the tabs 16 and 26 and the electrode plates in the stacked battery according to this modified example, the relationship between the protrusions 50 of the first tab 16 and the positive electrode plate 10X will be described below. The description of the relationship between the projection 50 of the first tab 16 and the positive electrode plate 10X is also applicable to the relationship between the projection 50 of the second tab 26 and the negative electrode plate 20Y unless contradictory. FIG. 17 is a cross-sectional view showing a portion where the first tab 16 is connected to the positive electrode plate 10X in the stacked battery according to this modified example. In the example shown in FIG. 17, the first positive electrode plate 10X1 has a recess 10Xa that receives the protrusion 50 (first protrusion 51) positioned on the first edge 16a.

The recessed portion 10Xa of the first positive electrode plate 10X1 shown in FIG. 17 is formed so that the first protrusion 51 of the first tab 16 does not come into contact with the positive electrode plate 10X when the first tab 16 is joined to the positive electrode plate 10X in the manufacturing process of the stacked battery. , and the first positive electrode plate 10X1 is deformed so as to receive the first protrusion 51. As shown in FIG. In this case, the plurality of positive electrode plates 10X positioned further away from the first tab 16 than the first positive electrode plate 10X1 may be deformed so as to form recesses according to the deformation of the first positive electrode plate 10X1. . In the example shown in FIG. 17, the second positive plate 10X2 and the third positive plate 10X3 are deformed to form recesses.

In this modification, the first protrusion 51 may be deformed by being pressed against the positive electrode plate 10X when the first tab 16 is joined to the positive electrode plate 10X in the manufacturing process of the laminated battery. . In the example shown in FIG. 17, the first protrusion 51 is deformed so as to be crushed by being pressed against the positive electrode plate 10X. In this modified example, the method of deformation of the first protrusion 51 is not limited to the example shown in FIG.

The effects of the stacked battery in this modified example will be described. In the stacked battery according to this modified example, the first positive electrode plate 10X1 and the first negative electrode plate have recesses that receive the projections 50. As shown in FIG. For this reason, the tabs 16 and 26 and the electrode plate 10X1 and the first negative plate 10X1 do not have the protrusions 50, and the first positive electrode plate 10X1 and the first negative plate do not have recesses for receiving the protrusions 50. contact area is larger. As a result, especially when the laminated battery 1 is a high-output battery that generates a large current, a large current is drawn from the laminated battery 1 through the portions where the tabs 16, 26 and the electrode plates are in contact. can be easily removed.

EXAMPLES Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the description of the Examples below as long as the gist of the present invention is not exceeded.

(Example 1)
As Example 1, a stacked battery was produced by the method for manufacturing a stacked battery described in the present embodiment. In the arranging step, first, as shown in FIG. As shown in FIG. 14, the adsorption portion 80 was adsorbed to the second surfaces 162 of the tabs 16 and 26 that are curved so as to be . Next, by moving the adsorption portion 80, the tabs 16, 26 were arranged so that the tabs 16, 26 faced the electrode body 2 on the first surface side as shown in FIG.

In the joining process, the tabs 16 and 26 arranged in the arrangement process were welded to the electrode plate of the electrode body 2 as shown in FIG. Specifically, a first tab 16 having a thickness of 200 μm and having a metal member made of aluminum and a coating made of zirconium provided on the surface of the metal member is formed of aluminum foil. A second tab 26 having a thickness of 200 μm, which is welded to the positive electrode current collector 11X and has a metal member made of a copper alloy and a coating made of nickel provided on the surface of the metal member, is coated with a copper foil. was welded to the negative electrode current collector 21Y formed by Welding of the tabs 16 and 26 to the electrodes was performed by ultrasonic welding using an ultrasonic welding machine (manufactured by Branson, trade name "2000Xdt"). As a result, the tabs 16 and 26 were joined to the electrode plate so that the tabs 16 and 26 faced the electrode body 2 on the first surface side and the first edge 16a overlapped with the electrode body 2 .

In the housing step, as shown in FIG. 1, the electrode body 2 and the tab 16 are placed so that the first edge 16a is located inside the exterior body 3 and the second edge 16b is located outside the exterior body 3 . , 26 are housed inside the exterior body 3 which is open at a part of the peripheral edge. The first member 4 and the second member 5 that constitute the exterior body 3 include base materials 4a and 5a, and thermoplastic resin layers 4b and 5b located closer to the housing space 6a than the base materials 4a and 5a. The base materials 4a and 5a include a plastic film containing nylon as a material and an aluminum foil located closer to the housing space 6a than the plastic film. The thermoplastic resin layers 4b and 5b are layers made of polypropylene and having a thickness of 80 μm. Further, the electrolytic solution was supplied to the inside of the exterior body 3 through the opening of the exterior body 3 . Then, the opening was sealed while the inside of the exterior body 3 was decompressed.

After that, the following processing was performed. First, the electrode body 2 was charged. Next, an opening was formed again in a part of the peripheral edge of the exterior body 3 . Then, the opening was sealed while the inside of the exterior body 3 was decompressed.

(Example 2)
Except that the tabs 16, 26 were flattened before the arrangement step to reduce the concave curvature toward the first surface between the first side and the second side of the tabs 16, 26. prepared a stacked battery by a method similar to that described in Example 1. The flattening of the tabs 16 and 26 is performed by sandwiching the tabs 16 and 26 between a pair of 2 mm thick metal plates made of the same material as the tabs 16 and 26 and using a 12t press machine (manufactured by JTC Co., Ltd.). It was carried out by pressing a pair of metal plates using.

(Example 3)
A method similar to the method described in Example 1, except that the tabs 16 and 26 were subjected to pressure processing and foreign matter removal processing at the first and second edges of the tabs 16 and 26 before the arranging step. A laminated battery was produced by In pressing the tabs 16, 26, the protrusions 50 located on the first and second edges of the tabs 16, 26 are folded or crushed, and the tabs 16, 26 on the first surface side In order to reduce the protruding portion, tabs 16 and 26 were processed as follows. Using a pair of rollers (manufactured by Ishikawa Giken Kogyo Co., Ltd., trade name "Ceramic Roller") made of ceramic containing silicon carbide (SiC), the first and second edges of the tabs 16 and 26 are attached to the tabs. The pressure was applied from the first surface side and the second surface side of 16 and 26 . In addition, the foreign matter removing process was performed by removing foreign matter from the first and second edges of the tabs 16 and 26 using an adhesive roller.

(Example 4)
A stack type battery was produced in the same manner as in Example 2, except that the tabs 16 and 26 were pressed and foreign matter was removed in the same manner as in Example 3.

(Comparative example 1)
As Comparative Example 1, when the tabs 16 and 26 are arranged in the arrangement step and the tabs 16 and 26 are joined to the electrode plate in the joining step, whether the tabs 16 and 26 face the electrode body 2 on the first surface side, A stacked battery was produced in the same manner as in Example 1, except that the second surface side facing the electrode body 2 was randomly selected.

(Comparative example 2)
As Comparative Example 2, when the tabs 16 and 26 are arranged in the arrangement step and the tabs 16 and 26 are joined to the electrode plate in the joining step, whether the tabs 16 and 26 face the electrode body 2 on the first surface side, A stacked battery was produced in the same manner as in Example 2, except that the second surface side facing the electrode body 2 was randomly selected.

(Comparative Example 3)
As Comparative Example 3, when the tabs 16 and 26 are arranged in the arranging step and the tabs 16 and 26 are joined to the electrode plate in the joining step, whether the tabs 16 and 26 face the electrode body 2 on the first surface side, A stacked battery was produced in the same manner as in Example 3, except that the second surface side faced the electrode body 2 was randomly selected.

(Comparative Example 4)
As Comparative Example 4, when the tabs 16 and 26 are arranged in the arranging step and the tabs 16 and 26 are joined to the electrode plate in the joining step, whether the tabs 16 and 26 face the electrode body 2 on the first surface side, A stack type battery was produced in the same manner as in Example 4, except that the second surface facing the electrode assembly 2 was randomly selected.

(Comparative Example 5)
As Comparative Example 5, the tabs 16 and 26 are arranged in the arranging step, and when the tabs 16 and 26 are joined to the electrode plate in the joining step, the tabs 16 and 26 face the electrode body 2 on the second surface side. A stacked battery was produced in the same manner as in Example 1, except that tabs 16 and 26 were arranged.

(Comparative Example 6)
As Comparative Example 6, the tabs 16 and 26 are arranged in the arrangement step, and when the tabs 16 and 26 are joined to the electrode plate in the joining step, the tabs 16 and 26 face the electrode body 2 on the second surface side. A stacked battery was produced in the same manner as in Example 2, except that tabs 16 and 26 were arranged.

(Comparative Example 7)
As Comparative Example 7, the tabs 16 and 26 are arranged in the arrangement step, and when the tabs 16 and 26 are joined to the electrode plate in the joining step, the tabs 16 and 26 face the electrode body 2 on the second surface side. A stacked battery was produced in the same manner as in Example 3, except that tabs 16 and 26 were arranged.

(Comparative Example 8)
As Comparative Example 8, the tabs 16 and 26 are arranged in the arrangement step, and when the tabs 16 and 26 are joined to the electrode plate in the joining step, the tabs 16 and 26 face the electrode body 2 on the second surface side. A stacked battery was produced in the same manner as in Example 4, except that tabs 16 and 26 were arranged.

The column of "manufacturing method" in FIG. 19 shows the manufacturing method of the stacked batteries in Examples 1-4 and Comparative Examples 1-8. For example, the description of "first surface" in the column "surface of tab facing electrode body" means that the tab 16, 26 faces the electrode body 2 on the first surface side in the joining step. , 26 are joined to the electrode plate, and the description of “second surface” means that the tabs 16 and 26 are arranged so that the tabs 16 and 26 face the electrode body 2 on the second surface side in the joining step. It indicates that the tabs 16 and 26 are joined to the electrode plate, and the description of "random" indicates whether the tabs 16 and 26 face the electrode body 2 on the first surface side or the second surface side in the joining step. The tabs 16, 26 are shown joined to the electrode plates in a random fashion. In addition, the description "yes" in the column "pressing and removing foreign matter on the first and second edges of the tabs" means that the tabs 16 and 26 have been subjected to pressing and foreign matter removing processing. The description of "none" indicates that the above pressing and removing processes are not performed.

(evaluation)
Evaluation of the damage rate of the thermoplastic resin layers 4b, 5b of the first member 4 and the second member 5 of the outer package 3 for the laminated batteries produced by the methods of Examples 1 to 4 and Comparative Examples 1 to 8 gone. In the evaluation of the damage rate of the thermoplastic resin layers 4b and 5b, 1000 or more laminated batteries were manufactured by the methods of Examples 1 to 4 and Comparative Examples 1 to 8, and each of the manufactured laminated batteries is determined whether or not the thermoplastic resin layers 4b and 5b are damaged, and it is determined that the thermoplastic resin layers 4b and 5b are damaged with respect to the total number of manufactured stacked batteries The ratio of the number of The following method was used to determine whether the thermoplastic resin layers 4b and 5b of the laminated battery were damaged. First, the manufactured laminated battery was charged so that the state of charge (SOC) was 100%. Next, the potential difference between the first tab 16 (positive electrode tab) and the aluminum foil included in the base materials 4a and 5a of the package 3 was measured in the stacked battery with the charging rate of 100%. Here, when the potential difference between the first tab 16 and the aluminum foil is 1.7 V or more and 2.7 V or less, the burr of the first tab 16 breaks through the thermoplastic resin layers 4b and 5b. Therefore, it is considered that the electrolytic solution inside the outer package 3 and the aluminum foil are in contact with each other, resulting in a short circuit. Therefore, when the potential difference between the first tab 16 and the aluminum foil was measured to be 1.7V or more and 2.7V or less, it was determined that the thermoplastic resin layers 4b and 5b of the laminated battery were damaged. FIG. 19 shows the evaluation results of the damage rate of the thermoplastic resin layers 4b and 5b.

From the evaluation results of the damage rate of the thermoplastic resin layers 4b and 5b, Comparative Examples 1 and 2 in which the surfaces of the tabs 16 and 26 facing the electrode body 2 were randomized and the tabs 16 and 26 were not press-processed, The damage rate in Comparative Examples 5 and 6, in which the surfaces of the tabs 16 and 26 facing the electrode body 2 were the second surfaces and the tabs 16 and 26 were not pressed, was 20% or more. It was found that the damage rate in the thermoplastic resin layers 4b and 5b of Examples 1 to 4, in which the surfaces of 16 and 26 facing the electrode body 2 are the first surfaces, is as low as less than 3%. The damage rate of the thermoplastic resin layers 4b and 5b of Examples 1 to 4 was lowered because the surfaces of the tabs 16 and 26 facing the electrode body 2 were set to be the first surfaces. This is probably because the first protrusion 51 is directed toward the side where the electrode body 2 is located, thereby suppressing the first protrusion 51 from damaging the thermoplastic resin layers 4b and 5b. Further, when the surfaces of the tabs 16 and 26 facing the electrode body 2 are the first surfaces, even when the tabs 16 and 26 are not press-processed as in the first and second embodiments, , the damage rate was found to be less than 3%.

Further, in the method of manufacturing the stacked type battery of Examples 1 to 4 and Comparative Examples 1 to 8, when the tabs 16 and 26 are arranged by moving the adsorption portion 80 in the placement step, the tabs 16 and 26 are adsorbed. An evaluation was made of the probability of occurrence of a problem with the suction unit 80 such as unintentional detachment from the unit 80 (hereinafter also referred to as a suction unit problem occurrence rate). In the evaluation of the adsorption portion failure rate, the stacked batteries were manufactured 1000 times or more by the methods of Examples 1 to 4 and Comparative Examples 1 to 8, respectively, and the tabs 16 and 26 were adsorbed in the arrangement process during manufacture. It was observed whether or not there was a problem of unintentional detachment from the portion 80 . Then, the ratio of the number of times that the tabs 16 and 26 were unintentionally attached/detached from the adsorption portions 80 in the arrangement process was determined with respect to the total number of times the laminated type battery was manufactured. FIG. 19 shows the evaluation results of the adsorption portion failure rate.

Based on the evaluation results of the adsorption portion failure rate, the surfaces of the tabs 16 and 26 facing the electrode body 2 were randomized, and the tabs 16 and 26 were not flattened. In Comparative Examples 5 and 6, in which the surface of 26 facing the electrode body 2 was the second surface and the tabs 16 and 26 were not flattened, the suction portion defect occurrence rate was 20% or more. In Examples 1 to 4 in which the surfaces of 16 and 26 facing the electrode body 2 are the first surfaces, it was found that the rate of occurrence of failures in the suction portion is as low as less than 3%. The reason why the failure rate of the suction part in Examples 1 to 4 was low is that the surfaces of the tabs 16 and 26 facing the electrode body 2 were made the first surfaces, and the wall surfaces of the tabs 16 and 26 and the suction part 80 were reduced. It is considered that the adsorption portion 80 can be strongly adsorbed to the tabs 16 and 26 because the gap between the tip of the tab 81 and the tip of the tab 81 is suppressed. Moreover, when the surfaces of the tabs 16 and 26 facing the electrode body 2 are used as the first surfaces, the tabs 16 and 26 are not flattened as in the first and third embodiments. Also, the damage rate was found to be less than 3%.

In addition, regarding the laminated batteries produced by the methods of Examples 1 to 4 and Comparative Examples 1 to 8, damage rates of the films of the tabs 16 and 26 (hereinafter also referred to as film damage rates) were evaluated. In the evaluation of the film damage rate, 1000 or more stacked batteries were manufactured by the methods of Examples 1 to 4 and Comparative Examples 1 to 8, and the tabs 16 and 26 of each of the manufactured stacked batteries were measured. It was determined whether or not the coating was damaged, and the ratio of the number of laminated batteries judged to have damaged coatings on the tabs 16 and 26 to the total number of manufactured laminated batteries was determined. Determination of whether or not the films of the tabs 16 and 26 are damaged in the laminated battery is made by observing the surface shape of the tabs 16 and 26 using a shape analysis laser microscope (manufactured by Keyence Corporation, trade name "VK-X1000"). I went by doing FIG. 19 shows the evaluation results of the film damage rate.

From the evaluation results of the film damage rate, in Examples 3 and 4 in which the tabs 16 and 26 were flattened, the film damage rate was 3% or more and less than 20%. It was found that in Examples 1 and 2 in which no hardening was performed, the film damage rate was less than 3%. This is because, in Examples 3 and 4, the coating of the tabs 16 and 26 was damaged by the flattening of the tabs 16 and 26, whereas in Examples 1 and 2, the tabs 16 and 26 were flattened. This is probably because damage to the coatings of the tabs 16 and 26 was suppressed because the coating was not carried out. Therefore, from the viewpoint of suppressing damage to the films of the tabs 16 and 26, it has been found that not performing the flattening process on the tabs 16 and 26 is preferable to performing the flattening process on the tabs 16 and 26. FIG.

In addition, for the methods of Examples 1 to 4 described above, an evaluation was made of the cost required to manufacture the laminated type battery. Specifically, in comparison with the case where the tabs 16 and 26 were not subjected to the pressing process, the foreign matter removing process, and the flattening process of the tabs 16 and 26 as in the first embodiment, the , the rate of increase in the cost required for manufacturing the stacked battery when at least one of the tabs 16 and 26 are pressed and foreign matter is removed or the tabs 16 and 26 are flattened was calculated. . As a result, compared with Example 1, the cost required for manufacturing the stacked battery increased by more than 0% and less than 5% in Examples 2 and 3, and increased by 5% or more in Example 4. found to do. Therefore, from the viewpoint of cost reduction, it is better not to press the tabs 16 and 26 and remove foreign matter and flatten the tabs 16 and 26. , as well as planarizing the tabs 16,26. In addition, in Example 1, as compared with Examples 2 to 4, the stack type battery was not subjected to the pressing process of the tabs 16 and 26, the removal process of the foreign matter, and the flattening process of the tabs 16 and 26. less time to manufacture. Therefore, from the viewpoint of shortening the time required to manufacture the laminated type battery, it is better not to press the tabs 16 and 26, remove foreign matter, and flatten the tabs 16 and 26. It has been found that this is preferable to machining, removing foreign matter, and flattening the tabs 16 and 26 .

Although one embodiment has been described above with reference to specific examples, the above-described specific examples are not intended to limit one embodiment. The embodiment described above can be implemented in various other specific examples, and various omissions, replacements, and modifications can be made without departing from the spirit of the embodiment.

1 Laminated battery 2 Electrode body 3 Exterior body 4 First member 4a Base material 4b Thermoplastic resin layer 5 Second member 5a Base material 5b Thermoplastic resin layer 6 Housing area 6a Housing space 7 Sealing area 8 Joint 10 First Electrode plate 10X Positive electrode plate 10Xa Recess 11 First electrode current collector 11X Positive electrode current collector 11a First surface 11b Second surface 12 First electrode active material layer 12X Positive electrode active material layer 16 First tab 161 First surface 162 Second Surface 16a First edge 16b Second edge 16c Third edge 16d Fourth edge 18 First sealant 20 Second electrode plate 20Y Negative electrode plate 21 Second electrode current collector 21Y Negative electrode current collector 21a First surface 21b Second surface 22 Second electrode active material layer 22Y Negative electrode active material layer 26 Second tab 28 Second sealant 30 Insulating layer 50 Projection 51 First projection 52 Second projection 60 Plate member 61 Insulator 71 Welding tool 72 Support 72a Support surface 80 Adsorption part 81 Wall surface 82 Adsorption hole

Claims (18)

A plate-shaped tab having a first surface and a second surface is attached to at least one of the plurality of electrode plates of an electrode body having a plurality of stacked electrode plates, and the tab is electrically connected to the electrode plate. a joining step of joining so as to be connected;
a housing step of housing the electrode body inside the exterior body,
the tab has a first edge and a second edge facing the first edge, and includes a protrusion located at least on the first edge and protruding from the first surface;
In the bonding step, the tab is bonded to the electrode plate so that the tab faces the electrode body on the first surface side and the first edge overlaps the electrode body,
In the accommodating step, the tab is partially accommodated inside the exterior body such that the first edge is located inside the exterior body and the second edge is located outside the exterior body. A method for manufacturing a laminated battery. 2. The manufacturing method of the stacked type battery according to claim 1, wherein the tab is curved so as to be concave toward the first surface between the first edge and the second edge. 3. The method of manufacturing a stacked battery according to claim 1, wherein said protrusion is positioned at least on said first edge and said second edge. 4. The method of manufacturing a stacked battery according to claim 1, wherein in said joining step, said tab is joined to said electrode plate by welding said tab to said electrode plate. arranging the tab such that the tab partially rests on the electrode body resting on a support surface and faces the electrode body on the side of the first surface prior to the joining step; Equipped with further processes,
5. The manufacturing method of the stacked type battery according to claim 4, wherein in said joining step, said tab is welded to said electrode plate by bringing a welding tool into contact with said second surface of said tab. 6. The manufacturing method of the stacked type battery according to claim 5, wherein in said arranging step, said tab is arranged so that said protrusion located on said first edge comes into contact with said electrode body. 7. The method of manufacturing a stacked battery according to claim 5, wherein in said arranging step, said tab is arranged by moving a suction portion that is adhered to said second surface side of said tab. The stacked battery according to any one of claims 1 to 7, wherein the protrusion has a height of 0.1 to 0.9 times the thickness of the tab before the joining step. manufacturing method. 9. The method of manufacturing a stacked battery according to claim 1, wherein said protrusion has a height of 20 μm or more and 180 μm or less before said joining step. an electrode body having a plurality of stacked electrode plates;
an exterior body housing the electrode body;
A tab electrically connected to at least one of the plurality of electrode plates, having a first side and a second side, and having a first edge and a second edge facing the first edge. and
the tab faces the electrode body on the first surface side and is connected to the electrode plate so that the first edge overlaps with the electrode body;
The outer body partially accommodates the tab so that the first edge is located inside the outer body and the second edge is located outside the outer body,
The stack type battery, wherein the tab includes a protrusion located at least on the first edge and protruding from the first surface. 11. The stack type battery according to claim 10, wherein, of the electrode plates on which the tabs at least partially overlap, the electrode plate closest to the tab is penetrated by the protrusion. 11. The stack type battery according to claim 10, wherein, of the electrode plates on which the tabs at least partially overlap, the electrode plate closest to the tab has a recess for receiving the protrusion. 13. The laminate according to any one of claims 10 to 12, wherein the tab is curved so as to be concave toward the first surface between the first edge and the second edge. type battery. 14. The stacked battery according to any one of claims 10 to 13, wherein said protrusions are positioned at least on said first edge and said second edge. 15. The stacked battery according to any one of claims 10 to 14, wherein said projection has a height of 0.1 to 0.9 times the thickness of said tab. The stacked battery according to any one of claims 10 to 15, wherein the protrusion has a height of 20 µm or more and 180 µm or less. The stacked battery according to any one of claims 10 to 16, wherein said tab has a thickness of 100 µm or more. A plate-shaped tab having a first surface and a second surface is attached to at least one of the plurality of electrode plates of an electrode body having a plurality of stacked electrode plates, and the tab is electrically connected to the electrode plate. a joining device for joining to be connected;
a housing device for housing the electrode body inside the exterior body,
the tab has a first edge and a second edge facing the first edge, and includes a protrusion located at least on the first edge and protruding from the first surface;
The joining device joins the tab to the electrode plate so that the tab faces the electrode body on the first surface side and the first edge side overlaps the electrode body,
The housing device partially houses the tab inside the exterior body such that the first side is located inside the exterior body and the second side is located outside the exterior body. A device for manufacturing laminated batteries.

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