JP2021051933A - Laminate type battery and method for conveying laminate type battery - Google Patents

Abstract

To suppress the worsening of the performance of a laminate type battery.SOLUTION: A laminate type battery comprises: an outer packaging body having a first base material and a second base material; a membrane-electrode assembly having a plurality of first electrode plates and a plurality of second electrode plates which are laminated to alternate in a laminating direction; and a first tab connected to one side of the membrane-electrode assembly in a first direction when viewed from the laminating direction. The first base material includes: a first tab side part extending inwardly from an outer edge on the side of the first tab in the first direction; and a bulged part which is bulged from an inner edge of the first tab side part in the first direction toward an opposite side to the second base material with respect to the first tab side part. The laminate type battery has a weight of 500 g or more. The first tab side part has a size of 20 mm or more in the first direction.SELECTED DRAWING: Figure 5

Description

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

For example, as proposed in Patent Document 1, a laminated battery in which positive electrode plates and negative electrode plates are alternately laminated is widely used. As an example of the laminated battery, a lithium ion secondary battery can be exemplified. One of the features of the lithium-ion secondary battery is that it has a larger capacity than other types of stacked batteries. Lithium-ion secondary batteries having such characteristics are expected to be further spread in various applications such as in-vehicle applications and stationary housing applications.

The laminated battery includes a membrane electrode assembly having a plurality of positive electrode plates (first electrode plates) and a plurality of negative electrode plates (second electrode plates) alternately laminated in the stacking direction. At the time of manufacturing the laminated battery, the membrane electrode assembly is sealed in the outer body together with the electrolytic solution. After that, the laminated battery is suspended and conveyed in an upright state while the bulging portion region where the bulging portion of the exterior body is located is sandwiched by the sandwiching device.

Japanese Unexamined Patent Publication No. 2014-60141

However, when a heavy laminated battery is transported, the pressing force on the bulging portion region by the sandwiching device increases, and the portion of the membrane electrode assembly located inside the bulging portion (for example, the electrode active material layer) is deformed. There is a risk of In this case, uneven reaction may occur and the performance of the laminated battery may deteriorate.

The present invention has been made in consideration of such a point, and an object of the present invention is to provide a laminated battery and a method for transporting the laminated battery, which can suppress deterioration of the performance of the laminated battery.

The laminated battery according to the present invention
It ’s a stacked battery,
An exterior body having a first base material and a second base material and forming a sealing space between the first base material and the second base material,
A membrane electrode assembly provided in the sealing space, the membrane electrode assembly having a plurality of first electrode plates and a plurality of second electrode plates alternately laminated in the stacking direction.
A first tab connected to one side of the membrane electrode assembly in the first direction when viewed in the stacking direction and extending to the outside of the exterior body in the first direction is provided.
The first base material is the first tab side portion extending inward from the outer edge on the side of the first tab in the first direction, and the first base material from the inner end of the first tab side portion in the first direction. The tab side portion includes a bulging portion that bulges on the side opposite to the side of the second base material and defines the sealing space.
The weight of the laminated battery is 500 g or more, and the weight is 500 g or more.
The dimension of the first tab side portion in the first direction is 20 mm or more.

In the laminated battery according to the present invention
The dimension of the first tab side portion in the first direction is 100 mm or less.
You may do so.

In the laminated battery according to the present invention
The dimension of the first tab side portion in the second direction orthogonal to the first direction when viewed in the stacking direction is 100 mm or more.
You may do so.

In the laminated battery according to the present invention
The first electrode plate includes a first electrode current collector including a first connection region and a first effective region adjacent to each other, and a first electrode active material layer provided in the first effective region.
The first tab side portion faces the first connection region of the first electrode plate.
You may do so.

In the laminated battery according to the present invention
Further comprising a second tab connected to the other side of the membrane electrode assembly in the first direction and extending outward of the exterior in the first direction.
The first substrate includes a second tab side portion extending inward from the outer edge on the side of the second tab in the first direction.
The bulging portion is formed from the inner end of the first tab side portion to the inner end of the second tab side portion in the first direction.
The dimension of the second tab side portion in the first direction is 20 mm or more.
You may do so.

In the laminated battery according to the present invention
The dimension of the second tab side portion in the first direction is 100 mm or less.
You may do so.

In the laminated battery according to the present invention
The dimension of the second tab side portion in the second direction orthogonal to the first direction when viewed in the stacking direction is 100 mm or more.
You may do so.

In the laminated battery according to the present invention
The second electrode plate includes a second electrode current collector including a second connection region and a second effective region adjacent to each other, and a second electrode active material layer provided in the second effective region.
The second tab side portion faces the second connection region of the second electrode plate.
You may do so.

In the laminated battery according to the present invention
The first base material and the second base material each include a metal layer and a resin adhesive layer provided on the inner surface of the metal layer.
The bulging portion and the first tab side portion of the first base material are composed of the metal layer and the resin adhesive layer.
You may do so.

The method for transporting a laminated battery according to the present invention is as follows.
The preparatory process for preparing the above-mentioned laminated battery and
A sandwiching step of sandwiching a sandwiched area defined as an area overlapping the first tab side portion of the laminated battery when viewed in the stacking direction by a sandwiching device.
A transfer step of suspending and transporting the laminated battery while sandwiching the sandwiched area by the sandwiching device is provided.

The method for transporting a laminated battery according to the present invention further includes an erecting step for erecting the laminated battery before the sandwiching step.
You may do so.

According to the present invention, deterioration of the performance of the laminated battery can be suppressed.

FIG. 1 is a perspective view showing a stacked battery according to an embodiment. FIG. 2 is a perspective view showing a membrane electrode assembly included in the laminated battery of FIG. FIG. 3 is a plan view of FIG. FIG. 4 is a partial cross-sectional view of the membrane electrode assembly of FIG. 2 as viewed in the second direction d2. FIG. 5 is a plan view of FIG. FIG. 6 is a cross-sectional view of the stacked battery of FIG. 5 as viewed in the second direction d2. FIG. 7 is a diagram for explaining a step of raising the laminated battery in the method of transporting the laminated battery according to the embodiment. FIG. 8 is a diagram for explaining a step of sandwiching the sandwiched area of the laminated battery by the sandwiching device in the method of transporting the laminated battery according to the embodiment. FIG. 9 is a partial cross-sectional view seen in the second direction d2 of FIG. FIG. 10 is a diagram for explaining a step of suspending and transporting a laminated battery while sandwiching a sandwiched area by a sandwiching device in the method of transporting a laminated battery according to an embodiment. FIG. 11 is a partial cross-sectional view showing a modified example (fourth modified example) of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, the scale, aspect ratio, etc. are appropriately changed from those of the actual product and exaggerated for the sake of ease of understanding.

[Stacked battery]
1 to 6 are views for explaining a laminated battery according to an embodiment of the present invention.

As shown in FIGS. 1 and 2, the laminated battery 1 according to the present embodiment is connected to the exterior body 40, the membrane electrode assembly 5 housed in the exterior body 40, and the membrane electrode assembly 5. It includes a pair of tabs 16 and 26. The tabs 16 and 26 extend to the outside of the exterior body 40. In the field of automobiles such as electric vehicles, a module composed of a combination of a plurality of laminated batteries 1 is mounted on the automobile. The electrical connection between the plurality of stacked batteries 1 is realized via the tabs 16 and 26.

Hereinafter, each component of the laminated battery 1 will be described.

(Membrane electrode assembly)
The membrane electrode assembly 5 has a plurality of electrode plates 10X and 20Y including a positive electrode plate 10X (first electrode plate) and a negative electrode plate 20Y (second electrode plate) alternately laminated in the stacking direction dL.

In the present embodiment, an example in which the membrane electrode assembly 5 constitutes a lithium ion secondary battery will be described. In this example, the first electrode plate constitutes the positive electrode plate 10X, and the second electrode plate constitutes the negative electrode plate 20Y. However, as can be understood from the description of the action and effect described below, the first electrode plate may form the negative electrode plate 20Y, and the second electrode plate may form the positive electrode plate 10X. Further, the present invention is not limited to the lithium ion secondary battery, and can be widely applied to the membrane electrode assembly 5 in which the first electrode plate and the second electrode plate are alternately laminated.

As shown in FIGS. 2 to 4, the membrane electrode assembly 5 has a plurality of positive electrode plates 10X and a plurality of negative electrode plates 20Y. The positive electrode plate 10X and the negative electrode plate 20Y are alternately arranged and laminated along the stacking direction dL. In the present embodiment, the negative electrode plates 20Y are arranged at the lowermost and uppermost portions of the membrane electrode assembly 5 in the stacking direction dL. The membrane electrode assembly 5 and the laminated battery 1 have a flat shape as a whole, have a thin thickness in the stacking direction dL, and spread in the directions d1 and d2 orthogonal to the stacking direction dL.

The positive electrode plate 10X and the negative electrode plate 20Y may have any shape when viewed in the stacking direction dL. As shown in the figure, the positive electrode plate 10X and the negative electrode plate 20Y may have an outer contour having a rectangular shape as a whole when viewed in the stacking direction dL. The laminated battery 1 has a first direction d1 in which a pair of tabs 16 and 26 are arranged, and a second direction d2 orthogonal to the first direction d1. In the illustrated example, the first direction d1 corresponds to the longitudinal direction (length direction) of the laminated battery 1, and the second direction d2 corresponds to the lateral direction (width direction) of the laminated battery 1. .. However, the first direction d1 may correspond to the lateral direction of the laminated battery 1, and the second direction d2 may correspond to the longitudinal direction of the laminated battery 1. The stacking direction dL is orthogonal to both the first direction d1 and the second direction d2. The positive electrode plate 10X and the negative electrode plate 20Y are arranged so as to be offset in the first direction d1. More specifically, the plurality of positive electrode plates 10X are arranged closer to one side in the first direction d1 (right side in FIG. 3), and the plurality of negative electrode plates 20Y are arranged on the other side in the first direction d1 (in FIG. 3). It is located closer to the left side). The positive electrode plate 10X and the negative electrode plate 20Y overlap in the stacking direction dL in the central portion (positive electrode effective region b1 and negative electrode effective region b2 described later) in the first direction d1.

As shown in the figure, the positive electrode plate 10X has a sheet-like outer shape. The positive electrode plate 10X has a positive electrode current collector 11X (first electrode current collector) and a positive electrode active material layer 12X (first electrode active material layer) provided on the positive electrode current collector 11X. .. The positive electrode active material layer 12X may have an arbitrary shape, but may have a rectangular outer contour as shown in the figure. In the lithium ion secondary battery, the positive electrode plate 10X occludes lithium ions during discharging and releases lithium ions during charging.

The positive electrode current collector 11X has a first surface 11a and a second surface 11b located on opposite sides of each other as main surfaces. The positive electrode active material layer 12X is formed on at least one surface of the first surface 11a and the second surface 11b of the positive electrode current collector 11X. In the present embodiment, the positive electrode active material layers 12X are provided on both sides of the positive electrode current collector 11X of each positive electrode plate 10X, and the positive electrode plates 10X can be configured to be the same as each other.

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 can be formed of an aluminum foil or an aluminum foil coated with highly conductive carbon particles or carbon nanotubes. The positive electrode active material layer 12X may contain, for example, a positive electrode active material, a conductive auxiliary agent, and a binder serving as a binder. In the positive electrode active material layer 12X, a positive electrode slurry formed by dispersing a positive electrode active material, a conductive auxiliary agent and a binder in a solvent is applied onto a material forming the positive electrode current collector 11X, and then dried, and then dried. It can be produced by pressing to increase the density. The positive electrode active material may contain a transition metal and lithium, or may contain one kind of transition metal and lithium. Examples of the positive electrode active material include a lithium transition metal composite oxide, a lithium-containing transition metal phosphoric acid compound, and the like, and these may be mixed and used. The transition metal of the lithium transition metal composite oxide may be vanadium, titanium, chromium, manganese, iron, cobalt, nickel, copper or the like. Specific examples of the lithium transition metal composite oxide include a lithium cobalt composite oxide such _{as LiCoO 2} , a lithium nickel composite oxide such as _{LiNiO 2} , and a lithium manganese composite oxide such as _{LiMnO 2} , LiMn ₂ O ₄ , and Li ₂ MnO _3. Others such as aluminum, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, magnesium, gallium, zirconium, etc. Examples thereof include a substitute substituted with a metal. Specific examples of the substitution product include, for example, LiNi _0.5 Mn _0.5 O ₂ , LiNi _0.80 Co _0.17 Al _0.03 O ₂ , LiNi _1/3 Co _1/3 Mn _1/3 O. ₂ , LiMn _{1.8 Al0.2} O ₄ , LiMn _1.5 Ni _0.5 O _{4, and the} like can be mentioned. The transition metal of the lithium-containing transition metal phosphoric acid compound may be vanadium, titanium, manganese, iron, cobalt, nickel or the like, and specific examples thereof include iron phosphates such as _{LiFePO 4 and LiCoPO. Cobalt phosphates such as 4} and some of the transition metal atoms that are the main constituents of these lithium transition metal phosphate compounds are aluminum, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, magnesium, gallium. , Substituents substituted with other metals such as zirconium, niobium and the like. As the conductive auxiliary agent, fine particles of graphite, carbon black such as acetylene black and Ketjen black, fine particles of amorphous carbon such as needle coke, carbon nanofibers and the like are used, but the present invention is not limited thereto. As the binder, a fluororesin such as polyvinylidene fluoride can be used.

As shown in FIG. 3, the positive electrode current collector 11X has a positive electrode connection region a1 (first connection region) and a positive electrode effective region b1 (first effective region) adjacent to each other. The positive electrode active material layer 12X is arranged only in the positive electrode effective region b1 of the positive electrode current collector 11X. The positive electrode effective region b1 may have an arbitrary shape. As shown in the figure, the positive electrode effective region b1 may have a rectangular outer contour, or may be a region provided with the positive electrode active material layer 12X as a whole. The positive electrode connection region a1 and the positive electrode effective region b1 are arranged in the first direction d1 of the positive electrode plate 10X. The positive electrode connection region a1 is located outside the positive electrode plate 10X in the first direction d1 (right side in FIG. 3) with respect to the positive electrode effective region b1.

The positive electrode connection portion 13 (first connection portion) is configured by the positive electrode connection region a1 of each positive electrode current collector 11X. The positive electrode connecting portion 13 has a first surface 13a, which is a side surface of the first base material 41, and a second surface 13b, which is a side surface of the second base material 42. The first surface 13a corresponds to the first surface 11a in the positive electrode connection region a1 of the positive electrode current collector 11X arranged on the side of the first base material 41 among the plurality of positive electrode current collectors 11X. Further, the second surface 13b corresponds to the second surface 11b in the positive electrode connection region a1 of the positive electrode current collector 11X arranged closest to the second base material 42 among the plurality of positive electrode current collectors 11X. In the present embodiment, the positive electrode tab 16 (first tab) is joined to the second surface 13b (see FIG. 6). The positive electrode tab 16 is bonded to the second surface 13b by resistance welding, ultrasonic welding, tape bonding, welding, or the like. Further, each positive electrode current collector 11X is also joined to each other at a position where the positive electrode tab 16 is joined to the second surface 13b. As a result, each positive electrode current collector 11X and the positive electrode tab 16 are electrically connected.

On the other hand, as shown in FIG. 3, the positive electrode effective region b1 is provided in the region of the negative electrode plate 20Y facing the negative electrode active material layer 22Y, which will be described later, when viewed in the stacking direction dL. Therefore, the size of the positive electrode effective region b1 of the positive electrode plate 10X in the first direction d1 is smaller than the size of the negative electrode effective region b2 of the negative electrode plate 20Y in the first direction d1 which will be described later. Further, the size of the positive electrode plate 10X in the second direction d2 is smaller than the size of the negative electrode plate 20Y in the second direction d2. By arranging the positive electrode effective region b1 in this way, it is possible to prevent the precipitation of lithium from the negative electrode active material layer 22Y.

In the present embodiment, the positive electrode plate 10X has a relatively large size, and the size of the positive electrode plate 10X in the first direction d1 may be 180 mm or more. The size of the positive electrode effective region b1 of the positive electrode plate 10X in the first direction d1 may be 150 mm or more. Further, the size of the positive electrode plate 10X in the second direction d2 may be 80 mm or more.

Next, the negative electrode plate 20Y will be described. The negative electrode plate 20Y also has a sheet-like outer shape like the positive electrode plate 10X. The negative electrode plate 20Y has a negative electrode current collector 21Y (second electrode current collector) and a negative electrode active material layer 22Y (second electrode active material layer) provided on the negative electrode current collector 21Y. .. The negative electrode active material layer 22Y may have an arbitrary shape, but may have a rectangular outer contour as shown in the figure. In the lithium ion secondary battery, the negative electrode plate 20Y emits lithium ions at the time of discharging and occludes the lithium ions at the time of charging.

The negative electrode current collector 21Y has a first surface 21a and a second surface 21b located on opposite sides of 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. In the present embodiment, the negative electrode active material layers 22Y are provided on both sides of the negative electrode current collector 21Y of each negative electrode plate 20Y, and the negative electrode plates 20Y can be configured to be the same as each other. The negative electrode active material layer 22Y may not be provided on the first surface 21a of the negative electrode current collector 21Y of the negative electrode plate 20Y arranged closest to the first base material 41. Further, the negative electrode active material layer 22Y may not be provided on the second surface 21b of the negative electrode current collector 21Y of the negative electrode plate 20Y arranged closest to the second base material 42.

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 formed of, for example, a copper foil. The negative electrode active material layer 22Y may contain, for example, a negative electrode active material, a conductive auxiliary agent, a binder serving as a binder, and a thickener. In the negative electrode active material layer 22Y, a slurry for a negative electrode formed by dispersing a negative electrode active material, a conductive auxiliary agent, a binder and a thickener in a solvent is applied onto a material forming the negative electrode current collector 21Y, followed by coating. It can be made by drying and then pressing to densify. Examples of the negative electrode active material include metallic lithium, lithium alloys, carbon-based materials capable of occluding and releasing lithium ions (carbon powder, graphite powder, etc.), metal oxides, and the like. Examples of the conductive auxiliary agent include acetylene black and carbon nanotubes. Examples of the binder include fluororesins such as polyvinylidene fluoride and styrene-butadiene rubber. Examples of the thickener include carboxymethyl cellulose and the like.

As shown in FIG. 3, the negative electrode current collector 21Y has a negative electrode connection region a2 (second connection region) and a negative electrode effective region b2 (second effective region) adjacent to each other. The negative electrode active material layer 22Y is arranged only in the negative electrode effective region b2 of the negative electrode current collector 21Y. The negative electrode effective region b2 may have an arbitrary shape. As shown in the figure, the negative electrode effective region b2 may have a rectangular outer contour, or may be a region provided with the negative electrode active material layer 22Y as a whole. The negative electrode connection region a2 and the negative electrode effective region b2 are arranged in the first direction d1 of the negative electrode plate 20Y. The negative electrode connection region a2 is located outside the negative electrode plate 20Y in the first direction d1 (left side in FIG. 3) with respect to the negative electrode effective region b2.

The negative electrode connection portion 23 (second connection portion) is configured by the negative electrode connection region a2 of each negative electrode current collector 21Y. The negative electrode connecting portion 23 has a first surface 23a, which is a side surface of the first base material 41, and a second surface 23b, which is a side surface of the second base material 42. The first surface 23a corresponds to the first surface 21a in the negative electrode connection region a2 of the negative electrode current collector 21Y arranged closest to the first base material 41 among the plurality of negative electrode current collectors 21Y. Further, the second surface 23b corresponds to the second surface 21b in the negative electrode connection region a2 of the negative electrode current collector 21Y arranged closest to the second base material 42 among the plurality of negative electrode current collectors 21Y. In the present embodiment, the negative electrode tab 26 (second tab) is joined to the second surface 23b (see FIG. 6). The negative electrode tab 26 is bonded to the second surface 23b by resistance welding, ultrasonic welding, tape bonding, welding, or the like. Further, the negative electrode current collectors 21Y are also joined to each other at the position where the negative electrode tab 26 is joined to the second surface 23b. As a result, each negative electrode current collector 21Y and the negative electrode tab 26 are electrically connected.

On the other hand, as shown in FIG. 3, the negative electrode effective region b2 extends so as to include a region of the positive electrode plate 10X facing the positive electrode active material layer 12X when viewed in the stacking direction dL. That is, the negative electrode effective region b2 extends so as to protrude to the outside of the positive electrode active material layer 12X over the entire circumference when viewed in the stacking direction dL. Therefore, as described above, the size of the negative electrode effective region b2 of the negative electrode plate 20Y in the first direction d1 is larger than the size of the positive electrode effective region b1 of the positive electrode plate 10X in the first direction d1. Further, the size of the negative electrode plate 20Y in the second direction d2 is larger than the size of the positive electrode plate 10X in the second direction d2.

In the present embodiment, the negative electrode plate 20Y has a relatively large size, and the size of the negative electrode plate 20Y in the first direction d1 may be 180 mm or more. The size of the negative electrode effective region b2 of the negative electrode plate 20Y in the first direction d1 may be 150 mm or more. Further, the size of the negative electrode plate 20Y in the second direction d2 may be 80 mm or more.

As shown in FIG. 4, the insulating sheet 31 may be arranged between the positive electrode plate 10X and the negative electrode plate 20Y. The insulating sheet 31 is interposed between the positive electrode plate 10X and the negative electrode plate 20Y and functions as a separator. In the example shown in FIG. 4, the insulating sheet 31 is arranged between the functional layer 30A of the positive electrode plate 10X, which will be described later, and the negative electrode active material layer 22Y of the negative electrode plate 20Y. Such an insulating sheet 31 can be formed of, for example, a non-woven fabric or a porous material. In this example, the electrolytic solution or the gel-like electrolytic solution contained in the exterior body 40 is impregnated into the insulating sheet 31 and held. The insulating sheet 31 used in this example is not particularly limited, and various insulators applicable to the laminated battery 1, particularly the lithium ion secondary battery, can be used.

Further, as shown in FIG. 4, at least one of the positive electrode plate 10X and the negative electrode plate 20Y may have the functional layer 30A on the surface facing the other. The functional layer 30A has an insulating property and prevents the positive electrode plate 10X and the negative electrode plate 20Y from being short-circuited. In the illustrated example, the positive electrode plate 10X has a functional layer 30A. The functional layer 30A is provided on the surface of the positive electrode active material layer 12X on the side of the insulating sheet 31 (the surface facing the insulating sheet 31). That is, the functional layer 30A is provided on the surface of each positive electrode active material layer 12X on the opposite side of the insulating sheet 31. The surface of each positive electrode active material layer 12X is covered with the functional layer 30A. The surface of the positive electrode plate 10X facing the insulating sheet 31 in the stacking direction dL is formed by the functional layer 30A. In addition to or in addition to the functional layer 30A shown in FIG. 4, the negative electrode plate 20Y may have a functional layer 30A covering each negative electrode active material layer 22Y.

The functional layer 30A may have a higher porosity than the negative electrode active material layer 22Y. Further, the functional layer 30A may have excellent heat resistance. An inorganic material may be used as the material of such a functional layer 30A. The inorganic material can impart excellent heat resistance, for example, heat resistance of 150 ° C. or higher to the functional layer 30A together with a high porosity. Inorganic materials include silicon dioxide, silicon nitride, alumina, boehmite, titania, zirconia, boron nitride, zinc oxide, tin dioxide, niobium oxide (Nb ₂ O ₅ ), tantalum oxide (Ta ₂ O ₅ ), potassium fluoride, Examples thereof include lithium fluoride, clay, zeolite, calcium carbonate, niob-tantalum composite oxide and magnesium-tantalum composite oxide. Further, an organic material may be used as the material of the functional layer 30A. Examples of the organic material include fibrous substances and particulate substances such as cellulose and its variants, polyolefins, polyethylene terephthalates, polybutylene terephthalates, polypropylenes, polyesters, polyacrylonitriles, aramids, polyamideimides, and polyimides. When the functional layer 30A is formed of alumina, it can be produced by coating it on the positive electrode active material layer 12X and solidifying it.

(tab)
As shown in FIGS. 1 to 3, the positive electrode tab 16 is connected to one side (right side in FIG. 3) of the membrane electrode assembly 5 in the first direction d1. Further, the negative electrode tab 26 is connected to the other side (left side in FIG. 3) of the membrane electrode assembly 5 in the first direction d1. In the present embodiment, as described above, the positive electrode tab 16 is connected to the second surface 13b of the positive electrode connection portion 13 of the membrane electrode assembly 5. Further, the negative electrode tab 26 is connected to the second surface 23b of the negative electrode connection portion 23 of the membrane electrode assembly 5. As described above, the tabs 16 and 26 are bonded by resistance welding, ultrasonic welding, tape bonding, welding, or the like, respectively. As a result, the positive electrode tab 16 is electrically connected to each positive electrode current collector 11X, and the negative electrode tab 26 is electrically connected to each negative electrode current collector 21Y.

The positive electrode tab 16 extends to the outside of the exterior body 40 in the first direction d1 and functions as a positive electrode terminal of the laminated battery 1. The positive electrode tab 16 is provided with a positive electrode sealant 18, which will be described later. Similarly, the negative electrode tab 26 extends to the outside of the exterior body 40 in the first direction d1 and functions as a negative electrode terminal of the laminated battery 1. The negative electrode tab 26 is provided with a negative electrode sealant 28, which will be described later.

The positive electrode tab 16 can be formed by using aluminum or the like. The negative electrode tab 26 can be formed using nickel, nickel-plated copper, or the like. The sealants 18 and 28 are made of a material that can be welded to the resin adhesive layer 40b of the exterior body 40 and the tabs 16 and 26. Examples of the materials of the sealants 18 and 28 include polypropylene, modified polypropylene, low-density polypropylene, ionomer, ethylene-vinyl acetate and the like.

(Exterior body)
The exterior body 40 is a packaging material for sealing the membrane electrode assembly 5. As shown in FIGS. 5 and 6, the exterior body 40 has a first base material 41 (upper outer body) and a second base material 42 (lower outer body) facing the first base material 41. are doing. In the present embodiment, the first base material 41 and the second base material 42 are configured as separate bodies.

The second base material 42 is formed in a sheet shape. On the other hand, the first base material 41 is formed in a convex shape. More specifically, the first base material 41 has a peripheral portion 43 and a bulging portion 44. The peripheral portion 43 includes a positive electrode tab side portion 43a (first tab side portion) extending inward from the outer edge 41a (right side in FIG. 5) on the positive electrode tab 16 side in the first direction d1, and a negative electrode in the first direction d1. It includes a negative electrode tab side portion 43b (second tab side portion) extending inward from the outer edge 41b (left side in FIG. 5) on the tab 26 side. Further, the peripheral portion 43 includes a first side portion 43c extending inward from the outer edge 41c on one side in the second direction d2 (lower side in FIG. 5) and an outer edge 41d on the other side in the second direction d2. A second side portion 43d extending inward from the upper side in FIG. 5) is included. As shown in FIG. 6, the bulging portion 44 bulges to the side opposite to the side of the second base material 42 (the side of the metal layer 40a described later of the first base material 41) with respect to the positive electrode tab side portion 43a. ing. Further, the bulging portion 44 is formed from the inner end 43e of the positive electrode tab side portion 43a to the inner end 43f of the negative electrode tab side portion 43b in the first direction d1. Further, the bulging portion 44 is formed from the inner end 43g of the first side portion 43c to the inner end 43h of the second side portion 43d in the second direction d2. The bulging portion 44 defines a sealing space 45 between the first base material 41 and the second base material 42. The membrane electrode assembly 5 is housed in the sealing space 45. The bulging portion 44 faces the portion where the positive electrode effective region b1 and the negative electrode effective region b2 of the membrane electrode assembly 5 overlap. On the other hand, the positive electrode tab side portion 43a faces the positive electrode connecting portion 13 of the membrane electrode assembly 5, that is, the positive electrode connecting region a1 of the positive electrode plate 10X. Further, the negative electrode tab side portion 43b faces the negative electrode connection portion 23 of the membrane electrode assembly 5, that is, the negative electrode connection region a2 of the negative electrode plate 20Y. The bulging portion 44 is formed, for example, by pressing a desired region of the sheet-shaped first base material 41 (drawing). In this case, the peripheral portion 43 and the bulging portion 44 are integrally formed.

The exterior body 40 may have flexibility. The first base material 41 and the second base material 42 of the exterior body 40 are each composed of a laminated film having a metal layer 40a and a resin adhesive layer 40b provided on the inner surface of the metal layer 40a. The metal layer 40a may have high gas barrier properties and molding processability. Such a metal layer 40a may be formed of a metal material such as aluminum foil or stainless steel foil. The resin adhesive layer 40b is located on the inner surface of the metal layer 40a and functions as a sealing layer for joining the metal layers 40a. The resin adhesive layer 40b may have insulating property, chemical resistance, thermoplasticity, etc. in addition to adhesiveness. Such a resin adhesive layer 40b may be formed of a resin material such as polypropylene, modified polypropylene, low density polypropylene, ionomer, ethylene / vinyl acetate or the like.

In the present embodiment, the laminated battery 1 is laminated after arranging the membrane electrode assembly 5 between the first base material 41 and the second base material 42. That is, on the peripheral edge of the exterior body 40, the resin adhesive layer 40b formed on the inner surfaces of the first base material 41 and the second base material 42 is heat-sealed (heat welded) to form the seal portion 46. .. In this way, the membrane electrode assembly 5 is housed in the sealing space 45 in which the first base material 41 and the second base material 42 are joined and the inside of the exterior body 40 is sealed.

The tabs 16 and 26 each extend from the inside of the exterior body 40 to the outside of the exterior body 40 through the seal portion 46 in the first direction d1. The first base material 41 and the tabs 16 and 26 are heat-sealed via the sealants 18 and 28. Similarly, the second base material 42 and the tabs 16 and 26 are heat-sealed via the sealants 18 and 28.

In the present embodiment, the exterior body 40 accommodates the positive electrode plate 10X and the negative electrode plate 20Y having a relatively large size as described above. Therefore, the exterior body 40 also has a relatively large size. The dimension L of the first base material 41 in the first direction d1 may be 200 mm or more. Further, the dimension W of the first base material 41 in the second direction d2 may be 100 mm or more. The dimensions L and W here mean the plane dimensions in a state where the peripheral edge portion of the exterior body 40 is flat without folding back at the end portion of the exterior body 40. When the end portion of the exterior body 40 is folded back, the dimensions L and W are the dimensions when the folded portion is returned to flatten the peripheral edge portion of the exterior body 40. The dimensions of the second base material 42 in the first direction d1 and the dimensions of the second base material 42 in the second direction d2 may be similar to those of the first base material 41.

Further, in the present embodiment, the dimension dx1 of the positive electrode tab side portion 43a in the first direction d1 may be 20 mm or more, or 100 mm or less. The dimension dx2 of the negative electrode tab side portion 43b in the first direction d1 may also be 20 mm or more, or 100 mm or less. Further, the dimension of the positive electrode tab side portion 43a in the second direction d2 may be the same as the dimension W of the first base material 41 in the second direction d2, or may be 100 mm or more. The size of the negative electrode tab side portion 43b in the second direction d2 may be the same as the size W of the first base material 41 in the second direction d2, or may be 100 mm or more. Note that these dimensions also mean the dimensions in a state where the peripheral edge portion of the exterior body 40 is flat without folding back at the end portion of the exterior body 40, and the end portion of the exterior body 40 is folded back. If so, it is the dimension when the folded-back portion is returned and the peripheral edge portion of the exterior body 40 is made flat.

As described above, in the present embodiment, the laminated battery 1 is a large laminated battery 1 including electrode plates 10X and 20Y having a relatively large size and an exterior body 40. Therefore, the weight of the laminated battery 1 is increased. In the present embodiment, the weight of the laminated battery 1 may be 500 g or more.

The laminated battery 1 configured in this way has a first sandwiched region S1 defined as a region overlapping the positive electrode tab side portion 43a and a region overlapping the negative electrode tab side portion 43b when viewed in the stacking direction dL. It is divided into a defined second sandwiched area S2 and a bulging portion area SB where the bulging portion 44 is located, which is provided between the first sandwiched area S1 and the second sandwiched area S2. (See FIGS. 5 and 6). The first sandwiched area S1 and the second sandwiched area S2 are areas for being sandwiched by the sandwiching device 60, which will be described later, when the laminated battery 1 is conveyed.

[Manufacturing method of stacked batteries]
Next, a method of manufacturing the laminated battery 1 according to the present embodiment, which is configured as a lithium ion secondary battery, will be described. The method for manufacturing the laminated battery described below includes a membrane electrode assembly preparation step for preparing the membrane electrode assembly 5, a tab attachment step for attaching the tabs 16 and 26 to the membrane electrode assembly 5, and a first base material 41. And an exterior body preparation step for preparing the second base material 42, and a sealing step for sealing the membrane electrode assembly 5 between the first base material 41 and the second base material 42. Hereinafter, each step will be described.

(Membrane electrode assembly preparation process)
In the membrane electrode assembly preparation step, the membrane electrode assembly 5 is prepared. The membrane electrode assembly preparation step includes a step of producing the positive electrode plate 10X and the negative electrode plate 20Y, respectively, and a step of alternately laminating the positive electrode plate 10X and the negative electrode plate 20Y.

First, a step of manufacturing the positive electrode plate 10X and the negative electrode plate 20Y is carried out. In this step, first, a composition (slurry) that constitutes the positive electrode active material layer 12X is applied onto a long aluminum foil that constitutes the positive electrode current collector 11X, and then dried. Then press to increase the density. Next, it can be cut to a desired size to produce a single-wafer-shaped positive electrode plate 10X. Similarly, a composition (slurry) that constitutes the negative electrode active material layer 22Y is applied onto a long copper foil that constitutes the negative electrode current collector 21Y, subsequently dried, and then pressed. To increase the density. Next, it can be cut to a desired size to produce a single-wafer-shaped negative electrode plate 20Y. When the functional layer 30A is formed of alumina on at least one of the positive electrode plate 10X and the negative electrode plate 20Y and applied, for example, on a long material before cutting or after cutting so as to form the electrode plates 10X and 20Y. The functional layer 30A can be produced by applying a material containing alumina on the single-wafer material of No. 1 and solidifying it.

Next, a step of alternately laminating the positive electrode plate 10X and the negative electrode plate 20Y is carried out. In this step, the positive electrode active material layer 12X of the positive electrode plate 10X and the negative electrode active material layer 22Y of the negative electrode plate 20Y face each other, and the insulating sheet 31 is interposed between the positive electrode plate 10X and the negative electrode plate 20Y. , Positive electrode plate 10X and negative electrode plate 20Y are laminated. The negative electrode plate 20Y is arranged at the lowermost portion and the uppermost portion in the stacking direction dL.

In this way, the membrane electrode assembly 5 in which the positive electrode plate 10X and the negative electrode plate 20Y are alternately laminated can be obtained.

(Tab mounting process)
After the membrane electrode assembly preparation step, a tab attachment step is performed. In the tab attachment step, a pair of tabs 16 and 26 are attached to both sides of the membrane electrode assembly 5 in the first direction d1. The tab attachment step includes a step of preparing the tabs 16 and 26 and a step of attaching the tabs 16 and 26 to the membrane electrode assembly 5.

First, the step of preparing the tabs 16 and 26 is carried out. In this step, a positive electrode tab 16 made of aluminum metal and to which a positive electrode sealant 18 is attached is prepared. The positive electrode sealant 18 is attached so as to cover a part of the positive electrode tab 16 in the first direction d1, and is attached so as to extend to both sides of the positive electrode tab 16 in the second direction d2. Further, a negative electrode tab 26 formed of copper metal and to which a negative electrode sealant 28 is attached is prepared. The negative electrode sealant 28 is attached so as to cover a part of the negative electrode tab 26 in the first direction d1, and is attached so as to extend to both sides of the negative electrode tab 26 in the second direction d2.

Next, a step of attaching the tabs 16 and 26 to the membrane electrode assembly 5 is carried out. In this step, the prepared tabs 16 and 26 are attached to the connecting portions 13 and 23 of the membrane electrode assembly 5, respectively. More specifically, first, the positive electrode tab 16 is placed on the stage. Subsequently, the membrane electrode assembly 5 is placed so that the upper surface of the positive electrode tab 16 and the second surface 13b of the positive electrode connection portion 13 of the membrane electrode assembly 5 partially overlap. At this time, the membrane electrode assembly 5 is aligned with the positive electrode tab 16 so that the center position of the positive electrode connection region a1 in the second direction d2 and the center position of the positive electrode tab 16 coincide with each other. After that, the positive electrode tab 16 is welded to the positive electrode connection portion 13 of the membrane electrode assembly 5 by resistance welding, ultrasonic welding, or the like. As a result, the positive electrode tab 16 is joined to the second surface 13b of the positive electrode connecting portion 13. At this time, the positive electrode current collectors 11X are also joined to each other at the position where the positive electrode tab 16 is joined to the second surface 13b. In this way, the positive electrode tab 16 can be electrically connected to the positive electrode connection portion 13 of the membrane electrode assembly. Similarly, the prepared negative electrode tab 26 can be electrically connected to the negative electrode connection portion 23 of the membrane electrode assembly 5.

In this way, the membrane electrode assembly 5 to which the tabs 16 and 26 are attached can be obtained.

(Exterior body preparation process)
In the exterior body preparation step, the first base material 41 and the second base material 42 are prepared. The exterior body preparation step includes a step of manufacturing the first base material 41 and a step of manufacturing the second base material 42.

In the step of producing the first base material 41, first, a composition of a resin material that constitutes the resin adhesive layer 40b is applied to one side of the aluminum foil that constitutes the metal layer 40a and solidified. Next, it is cut to a desired size to obtain a flat plate-shaped first base material 41. After that, the flat plate-shaped first base material 41 is drawn to form a bulging portion 44. Here, the dimension dx1 of the positive electrode tab side portion 43a and the dimension dx2 of the negative electrode tab side portion 43b in the first direction d1 are formed so as to have desired values. As a result, the first base material 41 having the positive electrode tab side portion 43a and the negative electrode tab side portion 43b having desired dimensions can be produced (see FIG. 5).

In the step of producing the second base material 42, first, a composition of a resin material that constitutes the resin adhesive layer 40b is applied to one side of the aluminum foil that constitutes the metal layer 40a and solidified. Next, it is cut to a desired size to obtain a flat plate-shaped second base material 42.

In this way, the first base material 41 and the second base material 42 constituting the exterior body 40 that seals the membrane electrode assembly 5 can be obtained.

(Seal process)
A sealing step is performed after the tab mounting step and the exterior body preparation step. In the sealing step, the membrane electrode assembly 5 is sealed in the exterior body 40.

In this sealing step, first, the second base material 42 is placed on the stage so that the resin adhesive layer 40b faces upward. Subsequently, the membrane electrode assembly 5 is placed on the second base material 42. Next, the first base material 41 is covered over the membrane electrode assembly 5 so that the membrane electrode assembly 5 is housed in the bulge 44. Here, the first base material 41 is covered so that the resin adhesive layer 40b of the first base material 41 faces the resin adhesive layer 40b of the second base material 42. Further, the first base material 41 is covered so that the positive electrode tab side portion 43a faces the positive electrode connection region a1 of the positive electrode plate 10X and the negative electrode tab side portion 43b faces the negative electrode connection region a2 of the negative electrode plate 20Y. At this time, the membrane electrode assembly 5 is arranged between the first base material 41 and the second base material 42 with the tabs 16 and 26 extending to the outside. At this time, the sealants 18 and 28 are arranged between the exterior body 40 and the tabs 16 and 26.

Then, around the membrane electrode assembly 5, the first base material 41 and the second base material 42 are pressed by a metal heat bar having a temperature of, for example, 150 ° C. to 200 ° C. As a result, the resin adhesive layers 40b formed on the inner surfaces of the first base material 41 and the second base material 42 are melted in the vicinity of the region pressed by the heat bar, and they are heat-sealed (heat welded) with each other. The seal portion 46 is formed.

More specifically, first, one edge of the exterior body 40 in the second direction d2 (lower side in FIG. 5) and one edge of the exterior body 40 in the first direction d1 (side of the positive electrode tab 16). , The right side in FIG. 5) and the other edge of the exterior body 40 in the first direction d1 (the side of the negative electrode tab 26, the left side in FIG. 5) are pressed by the heat bar. As a result, the resin adhesive layers 40b formed on the inner surfaces of the first base material 41 and the second base material 42 are melted in the vicinity of the region pressed by the heat bar, and they are heat-sealed (heat welded) with each other. To. During heat sealing, the sealants 18 and 28 melt together with the resin adhesive layer 40b of the first base material 41 and the second base material 42 around the tabs 16 and 26. Therefore, the first base material 41 and the tabs 16 and 26 are heat-sealed, and the second base material 42 and the tabs 16 and 26 are heat-sealed. As a result, it is possible to prevent the formation of a gap around the tabs 16 and 26 so as to communicate the sealing space 45 with the outside of the exterior body 40. By heat-sealing in this way, an opening is formed at the other side edge portion (upper side in FIG. 5) of the exterior body 40 in the second direction d2.

Next, the electrolytic solution is injected into the exterior body 40 through this opening. As a result, the inside of the exterior body 40 is filled with the electrolytic solution.

Then, in the second direction d2, the other edge portion (upper side in FIG. 5) of the exterior body 40 is pressed by the heat bar. As a result, the other side edge portion of the exterior body 40 in the second direction d2 is heat-sealed, and the opening portion is closed. Therefore, as shown in FIG. 5, the sealing portion 46 is continuously formed around the entire circumference of the membrane electrode assembly 5, and the frame-shaped sealing portion 46 allows the membrane electrode assembly 5 in the sealing space 45 to be formed. It is sealed in the exterior body 40 together with the electrolytic solution. This heat seal is performed in a pressure reducing chamber (not shown), and the sealing space 45 is sealed while being reduced in pressure.

In this way, the laminated battery 1 in which the membrane electrode assembly 5 is sealed in the exterior body 40 can be obtained.

[Transportation method for stacked batteries]
Next, a method of transporting the laminated battery 1 according to the present embodiment will be described with reference to FIGS. 7 to 10. The method for transporting the laminated battery described below includes a laminated battery preparation step (preparation step) for preparing the laminated battery 1, an upright step for raising the laminated battery 1, and a holding device 60 for the laminated battery 1. It includes a sandwiching step of sandwiching the sandwiched areas S1 and S2, and a transporting step of suspending and transporting the laminated battery 1 while sandwiching the sandwiched areas S1 and S2 by the sandwiching device 60. Hereinafter, each step will be described.

(Stacked battery preparation process)
In the laminated battery preparation step, the laminated battery 1 is prepared.

In this step, the laminated battery 1 can be obtained by the method for manufacturing a laminated battery described above. The obtained laminated battery 1 is mounted on the mounting surface 51 of the stage 50 so that the stacking direction dL of the laminated battery 1 is orthogonal to the mounting surface 51 of the stage 50. The lower surface (outer surface) of the second base material 42 of the laminated battery 1 faces the mounting surface 51.

(Standing process)
After the laminated battery preparation step, an upright step is performed. In the standing step, the laminated battery 1 is raised to be in the standing state.

In this step, as shown in FIG. 7, for example, the stacking direction dL of the laminated battery 1 is parallel to the mounting surface 51 of the stage 50, and the outer surface of the second base material 42 of the laminated battery 1 is mounted. It becomes perpendicular to the surface 51. For example, when viewed in the first direction d1, the laminated battery 1 is arranged so that one side in the second direction d2 is positioned upward by an upright device (not shown). The lower surface of the second base material 42 may be pushed up. As a result, as shown in FIG. 7, the laminated battery 1 can be erected on the stage 50.

(Pinching process)
After the standing process, a pinching process is performed. In the sandwiching step, the sandwiching device 60 sandwiches the sandwiched areas S1 and S2 of the laminated battery 1. The sandwiching step includes a step of sandwiching the first sandwiched area S1 and a step of sandwiching the second sandwiched area S2. Hereinafter, the first sandwiched area S1 is provided by the sandwiching device 60 having the first sandwiching portion 61 for sandwiching the first sandwiched area S1 and the second sandwiching portion 62 for sandwiching the second sandwiched area S2. An example of sandwiching the second sandwiched area S2 will be described.

In this example, the dimension dm1 of the first sandwiching portion 61 in the first direction d1 may be 5 mm or more and 20 mm or less. By setting the dimension dm1 of the first sandwiching portion 61 in the first direction d1 within such a numerical range, when the weight of the laminated battery 1 is 500 g or more, the laminated battery 1 is sandwiched so as not to drop. At the same time, the laminated battery 1 can be sandwiched at a pressure that does not leave an indentation on the laminated battery 1. In the present embodiment, the dimension dm1 of the first sandwiching portion 61 in the first direction d1 is 20 mm. Further, the dimension dn1 of the first holding portion 61 in the second direction d2 is, for example, 100 mm (see FIG. 8). Similarly, the dimension dm2 of the second sandwiching portion 62 in the first direction d1 may be 5 mm or more and 20 mm or less. By setting the dimension dm2 of the second sandwiching portion 62 in the first direction d1 within such a numerical range, when the weight of the laminated battery 1 is 500 g or more, the laminated battery 1 is sandwiched so as not to drop. At the same time, the laminated battery 1 can be sandwiched at a pressure that does not leave an indentation on the laminated battery 1. In the present embodiment, the dimension dm2 of the second sandwiching portion 62 in the first direction d1 is 20 mm. Further, the dimension dn2 of the second holding portion 62 in the second direction d2 is, for example, 100 mm (see FIG. 8). In order to prevent the laminated battery 1 from falling or leaving indentations on the laminated battery 1, the contact portions of the sandwiching portions 61 and 62 with the laminated battery 1 may be covered with rubber.

In the step of sandwiching the first sandwiched area S1, first, the pair of first sandwiched portions 61 of the sandwiching device 60 are moved to a position where the first sandwiched area S1 of the laminated battery 1 can be sandwiched. More specifically, one of the first sandwiching portions 61 is positioned on one side of the positive electrode tab side portion 43a so as to face the positive electrode tab side portion 43a, and the other first sandwiching portion 61 is positioned on the positive electrode tab side portion 43a. It is positioned on the other side so as to face the positive electrode tab side portion 43a (see FIG. 9). Subsequently, the pair of first sandwiching portions 61 sandwiches the first sandwiched area S1 with a predetermined pressing force. At this time, the first sandwiching portion 61 sandwiches the positive electrode connecting portion 13 of the positive electrode plate 10X via the first base material 41 and the second base material 42. Here, the dimension dm1 of the first sandwiching portion 61 in the first direction d1 is equal to or less than the dimension dx1 of the positive electrode tab side portion 43a in the first direction d1 described above. Therefore, the first sandwiched area S1 can be sandwiched by the first sandwiched portion 61.

On the other hand, in the step of sandwiching the second sandwiched area S2, first, the pair of second sandwiched portions 62 of the sandwiching device 60 is moved to a position where the second sandwiched area S2 of the laminated battery 1 can be sandwiched. Let me. More specifically, one of the second sandwiching portions 62 is positioned on one side of the negative electrode tab side portion 43b so as to face the negative electrode tab side portion 43b, and the other second sandwiching portion 62 is located on the negative electrode tab side portion 43b. It is positioned on the other side so as to face the negative electrode tab side portion 43b (see FIG. 9). Subsequently, the pair of second sandwiching portions 62 sandwiches the second sandwiched area S2 with a predetermined pressing force. At this time, the second sandwiching portion 62 sandwiches the negative electrode connecting portion 23 of the negative electrode plate 20Y via the first base material 41 and the second base material 42. Here, the dimension dm2 of the second sandwiching portion 62 in the first direction d1 is equal to or less than the dimension dx2 of the negative electrode tab side portion 43b in the first direction d1 described above. Therefore, the second sandwiched area S2 can be sandwiched by the second sandwiched portion 62.

In this way, as shown in FIGS. 8 and 9, the first sandwiched area S1 and the second sandwiched area S2 of the laminated battery 1 are sandwiched by the sandwiching device 60. The step of sandwiching the first sandwiched area S1 and the step of sandwiching the second sandwiched area S2 may be performed at the same time, but may be performed at different timings.

(Transport process)
After the pinching process, a transporting process is performed. In the transfer step, the laminated battery 1 is suspended and conveyed while sandwiching the sandwiched areas S1 and S2 by the sandwiching device 60.

In this transfer step, first, as shown in FIG. 8, in a state where the first sandwiched area S1 and the second sandwiched area S2 of the laminated battery 1 are sandwiched by the sandwiching device 60, the first sandwiching device 60 is sandwiched. The portion 61 and the second sandwiching portion 62 are raised. As a result, as shown in FIG. 10, the laminated battery 1 is separated from the mounting surface 51 of the stage 50 and suspended by the holding device 60. Subsequently, the first holding portion 61 and the second holding portion 62 are moved in the horizontal direction to transport the laminated battery 1 to a desired target position (a position where the next step, for example, the inspection step of the laminated battery is performed). To do. After the laminated battery 1 reaches the target position, the first holding portion 61 and the second holding portion 62 are lowered, and the stacked battery 1 is in an upright state and a tray having a slit provided at the target position (not shown). ). After that, the first sandwiching portion 61 is removed from the first sandwiched area S1, the second sandwiching portion 62 is removed from the second sandwiched area S2, and the first sandwiching portion 61 and the second sandwiching portion 62 are retracted.

In this way, the laminated battery 1 can be suspended and conveyed while sandwiching the sandwiched areas S1 and S2 by the sandwiching device 60.

As described above, according to the present embodiment, the dimension dx1 of the positive electrode tab side portion 43a in the first direction d1 is 20 mm or more. As a result, it is possible to secure a space for the sandwiching device 60 to sandwich the laminated battery 1 on the positive electrode tab side portion 43a. That is, the laminated battery 1 can be provided with the first sandwiched area S1 for sandwiching by the sandwiching device 60. Therefore, when the laminated battery 1 is conveyed, the first sandwiched area S1 can be sandwiched by the sandwiching device 60, and it is possible to prevent the bulging region SB from being sandwiched by the sandwiching device 60. That is, when the weight of the laminated battery 1 is large, the pressing force by the holding device 60 can be high. Therefore, when the bulging portion region SB of the heavy laminated battery 1 is sandwiched, the portion of the membrane electrode assembly 5 located inside the bulging portion 44 (for example, the electrode active material layers 12X and 22Y) is deformed. There is a possibility of doing so. However, according to the present embodiment, even when the weight of the laminated battery 1 is large, the first sandwiched region S1 can be sandwiched, so that the bulge region SB is prevented from being sandwiched. can do. As a result, deterioration of the performance of the laminated battery 1 can be suppressed.

Further, according to the present embodiment, the dimension dx1 of the positive electrode tab side portion 43a in the first direction d1 is 100 mm or less. As a result, it is possible to suppress an increase in the area of the first sandwiched region S1 when viewed in the stacking direction dL. Therefore, it is possible to suppress a decrease in the energy density of the laminated battery 1.

Further, according to the present embodiment, the dimension W of the positive electrode tab side portion 43a in the second direction d2 is 100 mm or more. In this case, the first sandwiched area S1 can be sandwiched by the first sandwiched portion 61 over the entire area of the first sandwiched portion 61 in the second direction d2. Therefore, the pinching device 60 can hold the first pinched area S1 more firmly.

Further, according to the present embodiment, the positive electrode tab side portion 43a faces the positive electrode connection region a1 of the positive electrode plate 10X. As a result, when the first sandwiched area S1 is sandwiched by the sandwiching device 60, the sandwiching device 60 can sandwich the positive electrode connection region a1 of the positive electrode plate 10X via the first base material 41 and the second base material 42. it can. Therefore, the holding device 60 can hold the laminated battery 1 more firmly. Further, since the positive electrode active material layer 12X is not provided in the positive electrode connection region a1, even when the positive electrode connection region a1 is sandwiched by a predetermined pressing force, deterioration of the performance of the laminated battery 1 can be suppressed. it can.

Further, according to the present embodiment, the dimension of the negative electrode tab side portion 43b in the first direction d1 is 20 mm or more. As a result, it is possible to secure a space for the sandwiching device 60 to sandwich the negative electrode tab side portion 43b of the laminated battery 1. That is, the laminated battery 1 can be provided with a second sandwiched area S2 for sandwiching by the sandwiching device 60. Therefore, when the laminated battery 1 is conveyed, both the first sandwiched area S1 and the second sandwiched area S2 can be sandwiched by the sandwiching device 60, and the laminated battery 1 can be held more firmly. Can be done.

Further, according to the present embodiment, the dimension dx2 of the negative electrode tab side portion 43b in the first direction d1 is 100 mm or less. As a result, it is possible to suppress an increase in the area of the second sandwiched region S2 when viewed in the stacking direction dL. Therefore, it is possible to suppress a decrease in the energy density of the laminated battery 1.

Further, according to the present embodiment, the dimension W of the negative electrode tab side portion 43b in the second direction d2 is 100 mm or more. In this case, the second sandwiched area S2 can be sandwiched by the second sandwiched portion 62 over the entire area of the second sandwiched portion 62 in the second direction d2. Therefore, the sandwiching device 60 can hold the second sandwiched area S2 more firmly.

Further, according to the present embodiment, the negative electrode tab side portion 43b faces the negative electrode connection region a2 of the negative electrode plate 20Y. As a result, when the second sandwiched area S2 is sandwiched by the sandwiching device 60, the sandwiching device 60 can sandwich the negative electrode connection region a2 of the negative electrode plate 20Y via the first base material 41 and the second base material 42. it can. Therefore, the holding device 60 can hold the laminated battery 1 more firmly. Further, since the negative electrode active material layer 22Y is not provided in the negative electrode connection region a2, it is possible to suppress the deterioration of the performance of the laminated battery 1 even when the negative electrode connection region a2 is sandwiched by a predetermined pressing force. it can.

Further, according to the present embodiment, the first base material 41 and the second base material 42 include a metal layer 40a and a resin adhesive layer 40b provided on the inner surface of the metal layer 40a. Generally, when such a so-called laminated film type exterior body is used as the exterior body 40 of the laminated battery 1, the strength of the exterior body 40 may decrease. Therefore, when the bulging portion region SB of the laminated battery 1 having such an exterior body 40 is sandwiched by the sandwiching device 60, the portion located in the bulging portion 44 is more easily deformed. On the other hand, according to the present embodiment, even when such a so-called laminated film type exterior body is used, the first sandwiched region S1 can be sandwiched, so that the bulging portion region SB is formed. It is possible to avoid being pinched. As a result, deterioration of the performance of the laminated battery 1 can be suppressed.

In the above, one embodiment has been described with reference to specific examples, but the above-mentioned specific examples are not intended to limit one embodiment. The above-described embodiment can be implemented in various other specific examples, and various omissions, replacements, and changes can be made without departing from the gist thereof.

Hereinafter, an example of modification will be described 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 parts in the above-mentioned specific examples are used for the parts that can be configured in the same manner as the above-mentioned specific examples, and the same reference numerals are used, and duplicate explanations are given. Is omitted.

(First modification)
In the above-described embodiment, both the dimension dx1 of the positive electrode tab side portion 43a and the dimension dx2 of the negative electrode tab side portion 43b in the first direction d1 are 20 mm or more, and the first sandwiched area S1 and the second sandwiched area S1 and the second by the sandwiching device 60. An example of transporting the laminated battery 1 by sandwiching both of the sandwiched areas S2 is shown. However, the present invention is not limited to this, and if the sandwiching device 60 can sandwich only the first sandwiched area S1a and convey the laminated battery 1, the size of the negative electrode tab side portion 43b is not 20 mm or more. You may. Similarly, if the sandwiching device 60 can sandwich only the second sandwiched area S2 and convey the laminated battery 1, the size of the positive electrode tab side portion 43a does not have to be 20 mm or more.

As described above, only one of the dimension dx1 of the positive electrode tab side portion 43a and the dimension dx2 of the negative electrode tab side portion 43b in the first direction d1 may be 20 mm or more. Even in such a case, when the laminated battery 1 is conveyed, the sandwiching device 60 can sandwich the first sandwiched area S1 or the second sandwiched area S2, which reduces the performance of the laminated battery 1. It can be suppressed.

(Second modification)
Further, in the above-described embodiment, the method for transporting the laminated battery includes an upright step, and after the laminated battery 1 is brought into an upright state in the upright step, the held area S1 of the laminated battery 1 is held in the holding step. , S2 is sandwiched. However, the method of transporting the laminated battery is not limited to this, and the method of transporting the laminated battery may not include an upright step. In this case, with the laminated battery 1 mounted on the stage 50 so that the stacking direction dL of the laminated battery 1 is orthogonal to the mounting surface 51 of the stage 50, the sandwiched area S1 of the laminated battery 1 S2 may be sandwiched by the sandwiching device 60.

Even in such a case, when the laminated battery 1 is conveyed, the first sandwiched area S1 can be sandwiched by the sandwiching device 60, and the performance deterioration of the laminated battery 1 can be suppressed.

(Third variant)
Further, in the above-described embodiment, an example is shown in which the first base material 41 and the second base material 42 are configured as separate bodies. However, the present invention is not limited to this, and the first base material 41 and the second base material 42 may be integrally and continuously formed. For example, the first base material 41 and the second base material 42 may be continuously formed in a single sheet shape on one side in the second direction d2. Then, the exterior body 40 may be formed by being bent at the boundary between the first base material 41 and the second base material 42. The seal portion 46 may not be formed on the bent portion.

Even in such a case, when the dimension dx1 of the positive electrode tab side portion 43a in the first direction d1 is 20 mm or more, the first sandwiched area S1 is transferred to the sandwiching device 60 when the laminated battery 1 is conveyed. Can be sandwiched, and deterioration of the performance of the laminated battery 1 can be suppressed.

(Fourth modification)
Further, in the above-described embodiment, an example is shown in which only the first base material 51 has the bulging portion 44. However, the present invention is not limited to this, and as shown in FIG. 11, the second base material 42 is the first with respect to the peripheral portion 43'and the peripheral portion 43', similarly to the first base material 41. It may have a bulging portion 44'that bulges on the side opposite to the side of the base material 41 (the side of the metal layer 40a of the second base material 42). Further, the peripheral portion 43'of the second base material 42 includes the positive electrode tab side portion 43a' extending inward from the outer edge 41a'(right side in FIG. 11) on the positive electrode tab 16 side in the first direction d1 and the first. The negative electrode tab side portion 43b'extending inward from the outer edge 41b'(left side in FIG. 11) on the negative electrode tab 26 side in the direction d1 may be included. The bulging portion 44'may be formed from the inner end 43e'of the positive electrode tab side portion 43a' to the inner end 43f' of the negative electrode tab side portion 43b'in the first direction d1.

The dimension dx1'of the positive electrode tab side portion 43a'of the second base material 42 in the first direction d1 may be equal to the dimension dx1 of the positive electrode tab side portion 43a of the first base material 41. Further, the dimension dx2'of the negative electrode tab side portion 43b'of the second base material 42 in the first direction d1 may be equal to the dimension dx2 of the negative electrode tab side portion 43a' of the first base material 41. In this case, when viewed in the stacking direction dL, the positive electrode tab side portion 43a'of the second base material 42 is located in the first sandwiched region S1, and the negative electrode tab side portion 43b' of the second base material 42 is located. It is located in the second pinched area S2. Further, when viewed in the stacking direction dL, the bulging portion 44'of the second base material 42 is located in the bulging portion region SB. However, the present invention is not limited to this, and the dimension dx1'of the positive electrode tab side portion 43a'of the second base material 42 in the first direction d1 is larger than the dimension dx1 of the positive electrode tab side portion 43a of the first base material 41. May be large. Further, the dimension dx2'of the negative electrode tab side portion 43b'of the second base material 42 in the first direction d1 may also be larger than the dimension dx2 of the negative electrode tab side portion 43a' of the first base material 41. In this case, when viewed in the stacking direction dL, a part of the positive electrode tab side portion 43a'of the second base material 42 is located in the first sandwiched region S1, and the remaining portion is in the bulging portion region SB. Located in. Further, when viewed in the stacking direction dL, a part of the negative electrode tab side portion 43b'of the second base material 42 is located in the second sandwiched region S2, and the remaining portion is in the bulging portion region SB. To position. Further, when viewed in the stacking direction dL, the bulging portion 44'of the second base material 42 is located in the bulging portion region SB.

As described above, even when both the first base material 41 and the second base material 42 have the bulging portions 44 and 44', the dimension dx1 of the positive electrode tab side portion 43a in the first direction d1 is 20 mm or more. Therefore, when the laminated battery 1 is conveyed, the first sandwiched area S1 can be sandwiched by the sandwiching device 60, and the performance deterioration of the laminated battery 1 can be suppressed. Further, according to this modification, the sealing space 45 can be defined by both the bulging portion 44 of the first base material 41 and the bulging portion 44'of the second base material 42. Therefore, more electrode plates 10X and 20Y can be accommodated in the sealing space 45, and the capacity of the laminated battery 1 can be increased.

(Fifth variant)
Further, in the above-described embodiment, an example in which the insulating sheet 31 is arranged between the positive electrode plate 10X and the negative electrode plate 20Y is shown. However, the present invention is not limited to this, and the insulating sheet 31 may not be arranged between the positive electrode plate 10X and the negative electrode plate 20Y. Even in such a case, since at least one of the positive electrode plate 10X and the negative electrode plate 20Y has the functional layer 30A on the surface facing the other, the positive electrode plate 10X and the negative electrode plate 20Y are short-circuited. Can be prevented.

1 Laminated battery 5 Film electrode joint 10X Positive electrode plate 11X Positive electrode current collector 12X Positive electrode active material layer 16 Positive electrode tab 20Y Negative electrode plate 21Y Negative electrode current collector 22Y Negative electrode active material layer 26 Negative electrode tab 40 Exterior body 40a Metal layer 40b Resin bonding Layer 41 1st base material 42 2nd base material 43a Positive electrode tab side 43b Negative electrode tab side 44 Swelling part 45 Sealing space 60 Holding device a1 Positive electrode connection area a2 Negative electrode connection area b1 Positive electrode effective area b2 Negative electrode effective area S1 First 1 pinched area S2 2nd pinched area

Claims (11)

It ’s a stacked battery,
An exterior body having a first base material and a second base material and forming a sealing space between the first base material and the second base material,
A membrane electrode assembly provided in the sealing space, the membrane electrode assembly having a plurality of first electrode plates and a plurality of second electrode plates alternately laminated in the stacking direction.
A first tab connected to one side of the membrane electrode assembly in the first direction when viewed in the stacking direction and extending to the outside of the exterior body in the first direction is provided.
The first base material is the first tab side portion extending inward from the outer edge on the side of the first tab in the first direction, and the first base material from the inner end of the first tab side portion in the first direction. The tab side portion includes a bulging portion that bulges on the side opposite to the side of the second base material and defines the sealing space.
The weight of the laminated battery is 500 g or more, and the weight is 500 g or more.
The dimension of the first tab side portion in the first direction is 20 mm or more.
Stacked battery. The dimension of the first tab side portion in the first direction is 100 mm or less.
The laminated battery according to claim 1. The dimension of the first tab side portion in the second direction orthogonal to the first direction when viewed in the stacking direction is 100 mm or more.
The laminated battery according to claim 1 or 2. The first electrode plate includes a first electrode current collector including a first connection region and a first effective region adjacent to each other, and a first electrode active material layer provided in the first effective region.
The first tab side portion faces the first connection region of the first electrode plate.
The laminated battery according to any one of claims 1 to 3. Further comprising a second tab connected to the other side of the membrane electrode assembly in the first direction and extending outward of the exterior in the first direction.
The first substrate includes a second tab side portion extending inward from the outer edge on the side of the second tab in the first direction.
The bulging portion is formed from the inner end of the first tab side portion to the inner end of the second tab side portion in the first direction.
The dimension of the second tab side portion in the first direction is 20 mm or more.
The laminated battery according to any one of claims 1 to 4. The dimension of the second tab side portion in the first direction is 100 mm or less.
The laminated battery according to claim 5. The dimension of the second tab side portion in the second direction orthogonal to the first direction when viewed in the stacking direction is 100 mm or more.
The stacked battery according to claim 5 or 6. The second electrode plate includes a second electrode current collector including a second connection region and a second effective region adjacent to each other, and a second electrode active material layer provided in the second effective region.
The second tab side portion faces the second connection region of the second electrode plate.
The laminated battery according to any one of claims 5 to 7. The first base material and the second base material each include a metal layer and a resin adhesive layer provided on the inner surface of the metal layer.
The bulging portion and the first tab side portion of the first base material are composed of the metal layer and the resin adhesive layer.
The laminated battery according to any one of claims 1 to 8. The preparatory step for preparing the laminated battery according to any one of claims 1 to 9.
A sandwiching step of sandwiching a sandwiched area defined as an area overlapping the first tab side portion of the laminated battery when viewed in the stacking direction by a sandwiching device.
A transfer step of suspending and transporting the laminated battery while sandwiching the sandwiched area by the sandwiching device is provided.
A method for transporting stacked batteries. A standing step of standing the laminated battery is further provided before the pinching step.
The method for transporting a laminated battery according to claim 10.

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