JP7182861B2 - Battery and its manufacturing method - Google Patents

Description

Embodiments of the present invention relate to batteries and methods of manufacturing the same.

In a battery such as a non-aqueous electrolyte secondary battery, the electrode group includes a first electrode that is one of a positive electrode and a negative electrode, and a second electrode that is the other electrode that is different from the first electrode of the positive electrode and the negative electrode. . In the electrode group, the first electrodes are formed from a plurality of first electrode plates, and the second electrodes are formed from a plurality of second electrode plates. Some have alternately stacked electrode plates. In such an electrode group, an insulating layer is formed integrally with the second electrode plate by, for example, an electrospinning method on the surface of the second electrode plate, and the second electrode plate is provided adjacent to the second electrode plate by the insulating layer. electrically insulated from the first electrode plate.

When forming the electrode group as described above, the first electrode plate is formed by punching out the first electrode base material, which is the base material of the first electrode, with a die, for example. Then, an insulating layer is formed by an electrospinning method or the like on the surface of the second electrode base material, which serves as the base material of the second electrode. Then, in the state where the insulating layer is formed, the second electrode base material is punched out with, for example, a die, to form a second electrode plate integrated with the insulating layer. When the second electrode plate and the insulating layer are formed in this way, the second electrode plate made of aluminum foil or the like is exposed at the edge of each of the second electrode plates. For this reason, in the electrode group, the edge of the second electrode plate is likely to come into contact with the first electrode plate, possibly reducing the insulation resistance of the electrode group.

After punching the second electrode base material to form the second electrode plates, an insulating layer is formed on each of the second electrode plates by an electrospinning method or the like, and the edge of the second electrode plate is covered with the insulating layer. Covering is possible. However, forming the second electrode plate and the insulating layer in this way increases the labor involved in manufacturing the electrode group and the battery.

Japanese Patent No. 5624653 Japanese Patent No. 5558265 International Publication No. 2016/203137

The problem to be solved by the present invention is to provide a battery in which insulation between a first electrode and a second electrode in an electrode group is appropriately ensured and which can be easily manufactured, and a method for manufacturing this battery. That's what it is.

According to embodiments, a battery comprises a first electrode, a second electrode , an insulating layer and an insulator . The first electrode comprises a plurality of electrode plates arranged side by side. The second electrode includes a current collector and an active material-containing layer supported on the surface of the current collector. A current collecting tab is provided that is formed by a proximal portion. The second electrode extends in a zigzag pattern between each of the electrode plates and the adjacent electrode plate. The insulating layer extends in a zigzag shape integrally with the second electrode. The insulating layer covers at least the portion other than the current collecting tab on the surface of the second electrode, and sandwiches the electrode plates of the first electrode. An insulator is disposed on each surface of the electrode plate at the first electrode and sandwiched between the corresponding electrode plate and the insulating layer. The first distance from one of the long edges of the second electrode to the end of the active material-containing layer of the second electrode on the side where the current collecting tab of the second electrode is located is the length of the second electrode. It is greater than a second distance from said one of the edges to the end of the insulating layer on the side on which said one of the long edges of the second electrode is located.

According to an embodiment, in a method of manufacturing a battery, a first electrode base material serving as a base material for a first electrode, which is one of a positive electrode and a negative electrode, and A second electrode base material is formed as a base material for a certain second electrode. In the formation of the second electrode base, a current collector and an active material-containing layer supported on the surface of the current collector are formed. A current collecting tab is formed on one of the long edges of the second electrode base material and in the vicinity thereof. Then, a plurality of electrode plates are formed by punching the first electrode base material. In addition, an insulating layer is formed integrally with the second electrode substrate on the surface of the second electrode substrate, and the surface of the second electrode substrate is covered with at least portions other than the above-mentioned one of the long edges and the vicinity thereof. Cover with an insulating layer. In the formation of the insulating layer, from the aforementioned one of the long edges of the second electrode substrate to the end of the active material-containing layer of the second electrode substrate on the side where the current collecting tab of the second electrode substrate is located The first distance is compared to the second distance from said one of the long edges of the second electrode substrate to the end of the insulating layer on the side on which said one of the long edges of the second electrode substrate is located. and make it bigger. Then, the second electrode integrally formed with the insulating layer is extended in a zigzag pattern between each of the electrode plates and the adjacent electrode plate, and each of the electrode plates is sandwiched between the insulating layers. By arranging an insulator on each surface of the electrode plate serving as the first electrode, the insulator is sandwiched between the corresponding electrode plate and the insulating layer.

FIG. 1 is a schematic diagram showing a battery according to the first embodiment. FIG. 2 is a schematic diagram showing the configuration of the electrode group according to the first embodiment. FIG. 3 is a cross-sectional view schematically showing the Z1-Z1 cross section of FIG. FIG. 4 is a cross-sectional view schematically showing the Z2-Z2 cross section of FIG. FIG. 5 is a schematic diagram showing a step of punching a positive electrode base material to form a plurality of electrode plates in manufacturing the electrode group according to the first embodiment. FIG. 6 is a schematic diagram showing steps of forming an insulating layer on a negative electrode base material and cutting the negative electrode base material on which the insulating layer is formed to form a negative electrode in the production of the electrode group according to the first embodiment. . FIG. 7 is a cross-sectional view schematically showing an electrode group according to a comparative example in a cross-section perpendicular or substantially perpendicular to the lateral direction of each electrode plate. FIG. 8 is a cross-sectional view schematically showing an electrode group according to a comparative example in a cross section perpendicular or substantially perpendicular to the longitudinal direction of each electrode plate. FIG. 9 is a graph showing experimental data on electrical insulation between the positive electrode and the negative electrode for the electrode group of the first embodiment and the electrode group of the comparative example. FIG. 10 is a cross-sectional view schematically showing the electrode group according to the first modified example in a cross section corresponding to the Z1-Z1 cross section of FIG. FIG. 11 is a cross-sectional view schematically showing the electrode group according to the first modification in a cross section corresponding to the Z2-Z2 cross section of FIG. FIG. 12 is a schematic diagram showing an example of an outer can or the like in which an electrode group is housed in the second modified example. FIG. 13 is a schematic diagram showing an example of an outer container in which an electrode group is housed in the third modified example. FIG. 14 is a schematic diagram showing an electrode group according to a fourth modification. FIG. 15 schematically shows a step of forming a projecting portion and an insulating layer on a negative electrode base material and cutting the negative electrode base material on which the insulating layer is formed to form a negative electrode in the production of the electrode group according to the fourth modification. It is a diagram.

Hereinafter, embodiments will be described with reference to FIGS. 1 to 15. FIG.

(First embodiment)
FIG. 1 shows a battery 1 according to a first embodiment. A battery 1 is a non-electrolyte secondary battery, an alkaline secondary battery, or the like. The battery 1 includes an outer container 2 , an electrode group 3 housed in the outer container 2 , and a positive electrode terminal 5 and a negative electrode terminal 6 protruding from the outer container 2 to the outside. The exterior container 2 is made of, for example, a laminate film. In this case, the laminate film forming the exterior container 2 includes a metal layer of aluminum, copper, stainless steel, or the like and a resin layer, and the laminate film is heat-sealed to form a bag-like shape, which is used as the exterior container 2 . Inside the outer container 2, the electrode group 3 is impregnated with an electrolytic solution (not shown).

FIG. 2 shows the configuration of the electrode group 3. As shown in FIG. 3 shows the Z1-Z1 cross section of FIG. 2, and FIG. 4 shows the Z2-Z2 cross section of FIG. 1, the electrode group 3 is shown as viewed from the arrow Y1 side of FIG. As shown in FIGS. 2 to 4 , the electrode group 3 includes a positive electrode 11 , a negative electrode 12 , and an insulating layer (separator) 13 that electrically insulates between the positive electrode 11 and the negative electrode 12 . The positive electrode terminal 5 is a metal ribbon, metal plate or metal rod electrically connected to the positive electrode 11 . The positive electrode 11 is electrically connected to the outside of the battery 1 via the positive electrode terminal 5 . A conductive material such as aluminum or titanium is used for the positive electrode terminal 5 . Also, the negative electrode terminal 6 is a metal ribbon, metal plate, or metal rod electrically connected to the negative electrode 12 . The negative electrode 12 is electrically connected to the outside of the battery 1 via the negative electrode terminal 6 . A conductive material such as aluminum, copper, or stainless steel is used for the negative electrode terminal 6, and it is preferable to use aluminum, which is lightweight and excellent in weldability.

In this embodiment, the positive electrode (first electrode) 11 includes a plurality of electrode plates 15, and the electrode plates 15 are arranged side by side. Each of the electrode plates 15 is arranged to face an adjacent electrode plate (one or two corresponding electrodes 15). Further, in this embodiment, the insulating layer 13 is formed integrally with the negative electrode 12 on the surface of the negative electrode (second electrode) 12 .

Here, in each of the electrode plates 15, the vertical direction, the horizontal direction perpendicular or substantially vertical to the vertical direction, and the vertical or substantially vertical direction to the vertical direction and vertical or substantially vertical to the horizontal direction thickness direction. Each of the electrode plates 15 is formed in a plate shape (sheet shape) having a dimension in the thickness direction smaller than the dimension in the vertical direction and the dimension in the horizontal direction. Each of the electrode plates 15 has a pair of surfaces 21 and 22 perpendicular or substantially perpendicular to the thickness direction. Each of the electrode plates 15 has a pair of vertical edges 23 and 24 formed along the vertical direction and a pair of horizontal edges 25 and 26 formed along the horizontal direction. In each electrode plate 15, the dimension in the vertical direction may be larger or smaller than the dimension in the horizontal direction. In each electrode plate 15, the dimension in the vertical direction may be the same or substantially the same as the dimension in the horizontal direction.

The negative electrode 12 is formed in a strip shape and extends along the longitudinal direction. Here, in the negative electrode 12, a width direction perpendicular or substantially perpendicular to the longitudinal direction and a thickness direction perpendicular or substantially perpendicular to the longitudinal direction and perpendicular or substantially perpendicular to the width direction are defined. do. In the negative electrode 12, the dimension in the longitudinal direction is larger than the dimension in the width direction, and the dimension in the width direction is larger than the dimension in the thickness direction. The negative electrode 12 has a pair of surfaces 31 and 32 that are perpendicular or substantially perpendicular to the thickness direction. The negative electrode 12 also has a pair of long edges 33 and 34 formed along the longitudinal direction and a pair of short edges 35 and 36 formed along the width direction.

3, each of the electrode plates 15 is shown in a cross section perpendicular or substantially perpendicular to the horizontal direction, and in FIG. 4, each of the electrode plates 15 is shown in a cross section perpendicular or substantially perpendicular to the longitudinal direction. is indicated by Further, in FIG. 3, the negative electrode 12 is shown in a cross section perpendicular or substantially perpendicular to the width direction, and in FIG. 4, the negative electrode 12 is shown in a cross section perpendicular or substantially perpendicular to the longitudinal direction.

Each of the electrode plates 15 of the positive electrode 11 includes a positive electrode current collector foil 41 as a positive electrode current collector and a positive electrode active material-containing layer 42 carried on the surface of the positive electrode current collector foil 41 . The positive current collector foil 41 is an aluminum foil, an aluminum alloy foil, or the like, and has a thickness of about 10 μm to 20 μm. A slurry containing a positive electrode active material, a binder, and a conductive agent is applied to the positive electrode current collector foil 41 . Examples of positive electrode active materials include, but are not limited to, oxides, sulfides, and polymers that can intercalate and deintercalate lithium. Moreover, from the viewpoint of obtaining a high positive electrode potential, it is preferable that the positive electrode active material is lithium-manganese composite oxide, lithium-nickel composite oxide, lithium-cobalt composite oxide, lithium iron phosphate, or the like.

The negative electrode 12 includes a negative electrode current collector foil 45 as a negative electrode current collector and a negative electrode active material-containing layer 46 carried on the surface of the negative electrode current collector foil 45 . The negative electrode collector foil 45 is an aluminum foil, an aluminum alloy foil, a copper foil, or the like, and has a thickness of about 10 μm to 20 μm. A slurry containing a negative electrode active material, a binder, and a conductive agent is applied to the negative electrode current collector foil 45 . Examples of the negative electrode active material include, but are not limited to, metal oxides, metal sulfides, metal nitrides, and carbon materials that can occlude and release lithium ions. As the negative electrode active material, a material having a lithium ion absorption/discharge potential of 0.4 V or more relative to the metal lithium potential, that is, a lithium ion absorption/discharge potential of 0.4 V (vs. Li ⁺ /Li) or more. It is preferably a substance. By using a negative electrode active material having such a lithium ion absorption/release potential, an alloy reaction between aluminum or an aluminum alloy and lithium is suppressed. Allows the use of aluminum alloys. Examples of the negative electrode active material having a lithium ion absorption/desorption potential of 0.4 V (vs. Li ⁺ /Li) or higher include titanium oxides, lithium-titanium composite oxides such as lithium titanate, tungsten oxides, and amorphous tin. oxides, niobium-titanium composite oxides, tin silicon oxides, silicon oxides, and the like, and it is particularly preferable to use lithium-titanium composite oxides as the negative electrode active material. Note that when a carbon material that absorbs and releases lithium ions is used as the negative electrode active material, it is preferable to use copper foil as the negative electrode current collector foil 45 . The carbon material used as the negative electrode active material has a lithium ion absorption/discharge potential of about 0 V (vs. Li ⁺ /Li).

The aluminum alloy used for the positive electrode current collector and the negative electrode current collector desirably contains one or more elements selected from Mg, Ti, Zn, Mn, Fe, Cu and Si. The purity of aluminum and aluminum alloys can be 98 wt% or higher, preferably 99.99 wt% or higher. Also, pure aluminum with a purity of 100% can be used as a material for the positive electrode current collector and/or the negative electrode current collector. The content of transition metals such as nickel and chromium in aluminum and aluminum alloys is preferably 100 ppm by weight or less (including 0 ppm by weight).

In each of the electrode plates 15 , a positive current collecting tab 43 is formed by one vertical edge 23 and its vicinity. The positive electrode current collecting tab 43 is formed from a part of the positive electrode current collecting foil 41 , and the positive electrode current collecting foil 41 does not carry the positive electrode active material containing layer 42 on the surface of the positive electrode current collecting foil 41 . In each of the electrode plates 15 of the present embodiment, a projecting portion 27 projecting outward in the horizontal direction is provided on the vertical edge 23 continuous between the horizontal edges 25 and 26 . A positive electrode current collecting tab 43 is formed by the projecting portion 27 of the longitudinal edge 23 and its vicinity. In another embodiment, on each of the electrode plates 15, the longitudinal edge 23 continues linearly between the lateral edges 25,26. In each of the electrode plates 15, a positive electrode current collecting tab 43 is formed extending inward in the lateral direction from the vertical edge 23 to a predetermined distance.

Since the positive electrode current collecting tabs 43 are formed as described above, in each of the electrode plates 15, the positive electrode current collecting tabs 43 of the positive electrode current collecting foil 41 are laterally outward ( side where the longitudinal edge 23 is located). Moreover, in the electrode group 3 , the electrode plates 15 are arranged in such a manner that the directions of protrusion of the positive electrode current collecting tabs 43 from the positive electrode active material-containing layer 42 are the same or substantially the same for all the electrode plates 15 . In the electrode plates (corresponding two of 15) adjacent to each other, the surface 21 of one electrode plate (corresponding one of 15) faces the other electrode plate (corresponding one of 15). ) face 22 .

In the negative electrode 12 , a negative electrode current collecting tab 47 is formed by one long edge 33 and its vicinity. The negative electrode current collecting tab 47 is formed from a part of the negative electrode current collecting foil 45 , and the negative electrode active material containing layer 46 is not carried on the surface of the negative electrode current collecting foil 45 in the negative electrode current collecting tab 47 . In the present embodiment, a negative electrode current collecting tab 47 is formed on the negative electrode 12 from the long edge 33 toward the inside in the width direction over a predetermined distance. Since the negative electrode current collecting tabs 47 are formed as described above, in the negative electrode 12 , the negative electrode current collecting tabs 47 of the negative electrode current collecting foil 45 are positioned outside the negative electrode active material containing layer 46 in the width direction (long edge 33 is located)).

Moreover, the insulating layer 13 integral with the negative electrode 12 is directly adhered to the surface of the negative electrode 12 and fixed to the negative electrode 12 without interposing another medium or the like. The insulating layer 13 is made of an electrically insulating material. In one embodiment, the insulating layer 13 is formed, for example, from organic fibers and is a sheet of organic fibers. Organic materials for forming organic fibers include engineering plastics, super engineering plastics and polyimides. Engineering plastics include polyamide, polyacetal, polybutylene terephthalate, polyethylene terephthalate, syndiotactic polystyrene, polycarbonate, polyamideimide, polyvinyl alcohol, polyvinylidene fluoride, and modified polyphenylene ether. Super engineering plastics include polyphenylene sulfide, polyetheretherketone, liquid crystal polymer, polyvinylidene fluoride, polytetrafluoroethylene (PTFE), polyethernitrile, polysulfone, polyacrylate, polyetherimide and thermoplastic polyimide. be done. In the insulating layer 13, the amount of organic fibers per unit area is about 1.0 g/m ² to 10 g/m ² . Also, the thickness of the insulating layer 13 is about 0.5 μm to 10 μm.

When forming an organic fiber sheet as the insulating layer 13, the insulating layer 13 is formed by any one of an electrospinning method, an inkjet method, a jet dispenser method, and a spray coating method. Also, in some embodiments, the insulating layer 13 may be formed from an inorganic material, or from a mixture of the aforementioned organic fibers and inorganic materials. Inorganic materials forming the insulating layer 13 include oxides (eg, aluminum oxide, silicon dioxide, magnesium oxide, phosphorous oxide, calcium oxide, iron oxide, titanium oxide), nitrides (eg, boron nitride, aluminum nitride, silicon nitride, barium nitride) and the like. The insulating layer formed from an inorganic material can be, for example, a layered base material in which inorganic material particles are dispersed, a layered aggregate of inorganic material particles, or a layer in which inorganic material particles are bound with a binder. .

The insulating layer 13 covers at least a portion of the surface of the negative electrode 12 other than the negative electrode current collecting tab 47 . Therefore, in the negative electrode 12 , at least the portion where the negative electrode active material containing layer 46 is supported is covered with the insulating layer 13 . That is, the negative electrode 12 is covered with the insulating layer 13 at least at portions other than the long edge 33 and its vicinity. Thus, in negative electrode 12 , long edge 33 and opposite long edge 34 are covered by insulating layer 13 . Each of the surfaces 31 and 32 is also covered with the insulating layer 13 at least at portions other than the negative electrode current collecting tab 47 .

Moreover, in this embodiment, the insulating layer 13 also partially covers the negative electrode current collecting tab 47 . That is, even a portion not supporting the negative electrode active material containing layer 46 is partially covered with the insulating layer 13 . Here, the distance L1 from the long edge 33 of the negative electrode 12 to the end of the side where the long edge 33 of the negative electrode active material containing layer 46 is located (the side where the negative electrode current collecting tab 47 is located), and the long edge 33 of the negative electrode 12 to the end on the side where the long edge 33 of the insulating layer 13 is located. In the present embodiment, since a portion of the negative electrode current collecting tab 47 is covered with the insulating layer 13, the distance L1 is longer than the distance L2.

In electrode group 3 , negative electrode 12 extends in a zigzag pattern between short edges 35 , 36 . Therefore, in the electrode group 3, each of the long edges 33 and 34 of the negative electrode 12 extends in a zigzag shape. The negative electrode 12 extending in a zigzag pattern passes between each of the electrode plates 15 and the opposing electrode plate (one or two corresponding electrode plates 15). That is, the negative electrode 12 extends between each of the electrode plates 15 and the adjacent electrode plate (one or two of the electrode plates 15 corresponding to each other). Thereby, the negative electrode 12 is arranged between each of the electrode plates 15 and the adjacent electrode plates (one or two corresponding to the electrode plates 15). In the electrode group 3, positive electrodes 11 (electrode plates 15) and negative electrodes 12 are alternately laminated.

In each of the electrode plates 15 , the negative electrode 12 extending in a zigzag shape is folded in a substantially U shape at one of the lateral edges 25 and 26 . In one electrode plate 15A of the electrode plates 15, the negative electrode 12 is folded back at the lateral edge 25, and in the electrode plate 15B adjacent to the electrode plate 15A on the surface 22 side, the negative electrode 12 is folded back at the lateral edge 26. is wrapped at . That is, in each of the electrode plates 15, the lateral edge (26; At 25), the negative electrode 12 is folded. In the electrode group 3 , the negative electrodes 12 extend such that the width direction of the negative electrodes 12 matches or substantially matches the lateral direction of each electrode plate 15 . In the example shown in FIG. 3, the short edges 35 and 36 of the negative electrode 12 are positioned on the same side with respect to each other in the longitudinal direction of the electrode plate 15, but the present invention is not limited to this. In some embodiments, the short edges 35 , 36 of the negative electrode 12 are located on opposite sides of each longitudinal direction of the electrode plate 15 .

Similarly to the negative electrode 12, the insulating layer 13 integral with the negative electrode 12 also extends in a zigzag shape through each of the electrode plates 15 and adjacent electrode plates (one or two corresponding to the 15). be done. Therefore, each of the electrode plates 15 is sandwiched between the insulating layers 13 . That is, in the electrode group 3 , the insulating layer 13 passes through the region adjacent to the surface 21 and also passes through the region adjacent to the surface 22 with respect to each of the electrode plates 15 . Thereby, in the electrode group 3 , the insulating layer 13 is arranged between each of the electrode plates 15 and the negative electrode 12 . In each of the electrode plates 15 , a gap of about several millimeters may be formed between the insulating layer 13 and the lateral edge (corresponding one of 25 and 26 ) where the negative electrode 12 and the insulating layer 13 are folded.

In the electrode group 3, the negative electrode 12 is arranged in a state of being shifted in the width direction of the negative electrode 12 (that is, in the lateral direction of each electrode plate 15) with respect to each of the electrode plates 15 of the positive electrode 11. . For this reason, in each of the electrode plates 15, the positive electrode current collecting tab 43 on which the positive electrode active material-containing layer 42 is not supported is directed to one side in the lateral direction (the width direction of the negative electrode 12) with respect to the negative electrode 12 and the insulating layer 13. protrude. Therefore, in each of the electrode plates 15 , at least a part of the vertical edge 23 protrudes to one side in the horizontal direction with respect to the negative electrode 12 and the insulating layer 13 . In the negative electrode 12 , the negative electrode current collecting tab 47 on which the negative electrode active material-containing layer 46 is not supported is set to the positive electrode current collecting tab 43 in the width direction (horizontal direction of each electrode plate 15 ) with respect to each of the electrode plates 15 . protrudes in the opposite direction to the side protruding. Therefore, in the negative electrode 12 , the long edge 33 protrudes to one side in the width direction with respect to each of the electrode plates 15 .

Next, manufacturing of the electrode group 3 of the battery 1 will be described. In manufacturing the electrode group 3, a positive electrode base material (first electrode base material) 11A that serves as a base material for the positive electrode 11 that is the first electrode is formed, and a base material for the negative electrode 12 that is the second electrode is formed. A negative electrode base material (second electrode base material) 12A is formed. As shown in FIG. 5, the positive electrode substrate 11A is formed in a belt shape having a longitudinal direction and a width direction. The positive electrode substrate 11A has a pair of long edges 71 and 72 formed along the longitudinal direction and a pair of short edges 73 and 74 formed along the width direction. In the positive electrode base material 11A, a slurry containing a positive electrode active material is applied to the surface of the positive electrode current collector foil 41, and the positive electrode active material containing layer 42 is supported. Further, in the positive electrode base material 11A, an active material non-supporting portion 43A is formed on the long edge 71 and its vicinity, where the positive electrode active material containing layer 42 is not supported.

In manufacturing the electrode group 3, the plurality of electrode plates 15 described above are formed by punching the positive electrode substrate 11A with a Vic die, a Thomson die, or the like. At this time, a part of the active material non-supporting portion 43A of the positive electrode substrate 11A forms the positive electrode current collecting tab 43 on each of the electrode plates 15 . Note that FIG. 5 shows a step of punching out the positive electrode substrate 11A to form a plurality of electrode plates 15 . In FIG. 5, the positive electrode active material-containing layer 42 is indicated by hatching with dots.

After forming the plurality of electrode plates 15 as described above, the electrode plates 15 are arranged. At this time, each of the electrode plates 15 is arranged apart from adjacent electrode plates (one or two corresponding to the 15). In addition, the electrode plates 15 are arranged in such a manner that the direction in which the positive electrode current collecting tabs 43 protrude from the positive electrode active material containing layer 42 coincides or substantially coincides with each other in all the electrode plates 15 .

As shown in FIG. 6, the negative electrode substrate 12A is formed in a belt shape having a longitudinal direction and a width direction. The negative electrode substrate 12A has a pair of long edges 75 and 76 formed along the longitudinal direction. In the negative electrode substrate 12A, slurry containing a negative electrode active material is applied to the surface of the negative electrode current collector foil 45 to support the negative electrode active material containing layer 46 . In addition, in the negative electrode substrate 12A, an active material non-supporting portion 47A is formed on the long edge 75 and its vicinity, where the negative electrode active material containing layer 46 is not supported. Here, the distance from the long edge 75 of the negative electrode substrate 12A to the end of the side where the long edge 75 of the negative electrode active material containing layer 46 is located is L1, and the negative electrode substrate 12A is elongated inward in the width direction. An active material non-supporting portion 47A is formed over a distance L1 from the edge 75 .

In manufacturing the electrode group 3, the insulating layer 13 described above is formed integrally with the negative electrode substrate 12A. The insulating layer 13 is formed by, for example, electrospinning. In this case, an organic fiber sheet is formed as the insulating layer 13 on the surface of the negative electrode substrate 12A. The formed insulating layer 13 directly adheres to the surface of the negative electrode base material 12A without interposing another medium or the like, and is fixed to the negative electrode base material 12A. The insulating layer 13 may be made of the inorganic material described above, or may be made of a mixture of organic fibers and inorganic materials.

When the insulating layer 13 is formed, the insulating layer 13 covers at least a portion of the surface of the negative electrode base material 12A other than the long edge 75 and its vicinity. Therefore, by forming the insulating layer 13 , the insulating layer 13 covers at least a portion of the negative electrode base material 12</b>A other than the active material non-supporting portion 47</b>A. In addition, by forming the insulating layer 13 , part of the active material non-supporting portion 47</b>A is also covered with the insulating layer 13 . Actually, the distance from the long edge 75 of the negative electrode substrate 12A to the end of the insulating layer 13 on the side where the long edge 75 is located is a distance L2 that is smaller than the distance L1. Then, the negative electrode base material 12A integrally formed with the insulating layer 13 is cut into a predetermined length in the longitudinal direction to form the negative electrode 12 . In FIG. 6, the negative electrode 12 is formed by cutting the negative electrode base material 12A along broken lines A1 and A2. Thereby, the negative electrode 12 integrated with the insulating layer 13 is formed. At this time, each long edge 33 of the negative electrode 12 is formed from a portion of the long edge 75 of the negative electrode substrate 12A, and each long edge 34 of the negative electrode 12 is formed from a portion of the long edge 76 of the negative electrode substrate 12A. It is formed. Further, each negative electrode current collecting tab 47 of the negative electrode 12 is formed from a portion of the active material non-supporting portion 47A of the negative electrode substrate 12A. The respective short edges 35, 36 of the negative electrode 12 are formed by the cut portions (A1, A2) of the negative electrode substrate 12A. 6 shows a step of forming the insulating layer 13 on the negative electrode substrate 12A and cutting the negative electrode substrate 12A with the insulating layer 13 formed thereon to form the negative electrode 12. FIG. In FIG. 6, the negative electrode active material containing layer 46 is indicated by hatching with dots, and the insulating layer 13 is indicated by hatching with oblique lines.

Then, the negative electrode 12 integrally formed with the insulating layer 13 is extended in a zigzag shape through each of the electrode plates 15 and adjacent electrode plates (one or two corresponding to the 15). Thereby, as shown in FIG. 3, each of the electrode plates 15 is sandwiched between the insulating layers 13 . Then, the electrode group 3 shown in FIGS. 2 to 4 is assembled.

In the present embodiment, the electrode group 3 is manufactured as described above, so that the insulating layer 13 covers at least a portion of the surface of the negative electrode 12 other than the negative electrode current collecting tab 47 . Therefore, the long edge 34 is also covered with the insulating layer 13 at a portion other than the negative electrode current collecting tab 47 . That is, the edge of the negative electrode 12 is not exposed at the portion opposite to the negative electrode current collecting tab 47 . Therefore, the contact of each electrode plate 15 of the positive electrode 11 with the edge of the negative electrode 12 is effectively prevented, and a decrease in insulation resistance between the positive electrode 11 and the negative electrode 12 in the electrode group 3 is effectively prevented. . Therefore, electrical insulation between the positive electrode 11 and the negative electrode 12 is ensured in the electrode group 3 .

In particular, in the electrode group 3 , the positive electrode current collecting tab 43 is arranged at a position close to the edge of the negative electrode 12 or the like. However, in this embodiment, the entire long edge 34 , which is the edge on the side opposite to the negative electrode current collecting tab 47 , is covered with the insulating layer 13 . For this reason, contact with edges such as the long edge 34 of the positive electrode current collecting tab 43 is effectively prevented.

In addition, in the present embodiment, a portion of the negative electrode current collecting tab 47 , that is, a portion of the negative electrode current collecting tab 47 on the side closer to the negative electrode active material containing layer 46 is covered with the insulating layer 13 . Therefore, contact of the negative electrode current collecting tab 47 with the positive electrode 11 is also effectively prevented. This improves the electrical insulation between the positive electrode 11 and the negative electrode 12 in the electrode group 3 .

Here, the electrical insulation between the positive electrode 11 and the negative electrode 12 of the electrode group 3 having the configuration of this embodiment and the electrode group 3A having the configuration of the comparative example shown in FIGS. verified. 7 and 8, the positive electrode 11 is formed of a plurality of electrode plates (positive electrode plates) 15 as in the present embodiment, and the electrode plate (first electrode plate) is formed in the same manner as in the present embodiment. ) 15 are arranged side by side. However, in the comparative example, the negative electrode 12 is also formed from a plurality of electrode plates (negative electrode plates) 16, and each of the electrode plates (second electrode plates) 16 is connected to the corresponding one of the adjacent electrode plates (16). or two). Each of the electrode plates 15 is then positioned between corresponding electrode plates (two corresponding ones of 16) that are adjacent to each other. Thus, in the electrode group 3A, the electrode plates 15 and the electrode plates 16 are alternately stacked therebetween.

Also, in the comparative example, each of the electrode plates 16 has a pair of longitudinal edges 33A, 34A and a pair of lateral edges 35A, 36A. Further, each of the electrode plates 16 includes a negative electrode current collector foil 45 and a negative electrode active material containing layer 46, like the negative electrode 12 of the present embodiment. In each of the electrode plates 16, the vertical edge 33A and the vicinity thereof form a negative electrode current collecting tab 47 on which no negative electrode active material containing layer 46 is supported. In the electrode group 3</b>A, each of the positive electrode current collecting tabs 43 protrudes from the electrode plate 16 . Further, in the electrode group 3A, each of the negative electrode current collecting tabs 47 protrudes from the electrode plate 15 on the side opposite to the side on which the positive electrode current collecting tab 43 protrudes. 7, each of the electrode plates 15 and 16 is shown in a cross section perpendicular or substantially perpendicular to the horizontal direction, and in FIG. 8, each of the electrode plates 15 and 16 is shown in a cross section perpendicular or substantially perpendicular to the is indicated by

Moreover, in the comparative example, the insulating layer 13 is formed integrally with each of the electrode plates 16 . In each of the electrode plates 16 , the negative electrode active material containing layer 46 is covered with the insulating layer 13 and part of the negative electrode current collecting tab 47 is also covered with the insulating layer 13 . Here, in forming the electrode plate 16 of the comparative example, for example, the negative electrode substrate 12A is formed in the same manner as in the present embodiment, and the insulating layer 13 is integrally formed on the surface of the negative electrode substrate 12A in the same manner as in the present embodiment. (see FIG. 6). Then, the electrode plates 16 are formed by punching the negative electrode base material 12A integrally formed with the insulating layer 13 with a Vic die, a Thomson die, or the like.

Since the electrode plates 16 are formed as described above, the edges such as the vertical edges 34A of each of the electrode plates 16 are not covered with the insulating layer 13 even at the portions other than the negative electrode current collecting tabs 47 . In other words, in each of the electrode plates 16 , the edge is exposed also at a portion other than the negative electrode current collecting tab 47 . Therefore, the edge of each of the electrode plates 16 is likely to come into contact with the electrode plate 15 of the positive electrode 11 . In particular, in each electrode plate 16 , the vertical edge 34</b>A, which is the edge opposite to the negative electrode current collecting tab 47 , is likely to come into contact with the positive electrode current collecting tab 43 .

FIG. 9 shows experimental data on electrical insulation between the positive electrode 11 and the negative electrode 12 for the electrode group 3 having the configuration of this embodiment and the electrode group 3A having the configuration of the comparative example. Regarding the electrical insulation between the positive electrode 11 and the negative electrode 12, 24 electrode groups 3 having the configuration of this embodiment and 10 electrode groups 3A having the configuration of the comparative example were verified. In the verification, in both the electrode groups 3 and 3A, the positive electrode current collector foil 41 used an aluminum alloy foil with an aluminum purity of 99% or more and a thickness of 15 μm, and the negative electrode current collector foil 45 used an aluminum alloy foil. An aluminum alloy foil with a purity of 99% or more and a thickness of 15 μm was used. In both electrode groups 3 and 3A, lithium cobaltate was used as the positive electrode active material, and lithium titanate with a spinel structure was used as the negative electrode active material. In both the electrode groups 3 and 3A, the insulating layer 13 was formed by an electrospinning method, and a polyimide solution was used as the organic material solution forming the organic fibers. In both the electrode groups 3 and 3A, the amount of organic fibers per unit area in the insulating layer 13 was 1.0 g/m ² to 2.4 g/m ² . Also, the thickness of the insulating layer 13 is set to 0.5 μm to 5 μm.

In the verification, a tester was used to measure the resistance value between the positive electrode 11 and the negative electrode 12 for each of the electrode groups 3 and 3A. Then, based on the measured resistance values, it was determined whether each of the electrode groups 3 and 3A was a non-defective product. At this time, when the resistance value was 10 kΩ or more, it was determined to be a non-defective product, and when the resistance value was less than 10 kΩ, it was determined not to be a non-defective product. Also, in the verification, a non-defective product rate indicating the ratio of non-defective products among the 24 electrode groups 3 was calculated, and a non-defective product ratio indicating the ratio of non-defective products among the 10 electrode groups 3A was calculated.

In the verification, first, in step S1 of the manufacturing process of the battery 1, resistance values were measured for all the electrode groups 3 and 3A, and it was determined whether or not they were non-defective products. Then, only the electrode group (3) determined to be non-defective in step S1 was subjected to resistance measurement in step S2 of the manufacturing process of the battery 1 to determine whether or not it was non-defective. Then, in step S3 of the manufacturing process of the battery 1, only the electrode group (3) determined to be non-defective in step S2 was subjected to resistance measurement to determine whether or not it was non-defective. Then, only the electrode group (3) determined to be non-defective in step S3 was subjected to resistance measurement in step S4 of the manufacturing process of the battery 1 to determine whether or not it was non-defective. Here, step S1 is immediately after assembling the electrode group (3, 3A), and step S2 is to join the positive electrode current collecting tab 43 in the assembled electrode group (3) by ultrasonic welding or the like, and , immediately after the negative electrode current collecting tab 47 is joined by ultrasonic welding or the like. Step S3 is immediately after the electrode group (3) is housed in the outer container 2 made of a laminate film, and step S4 is immediately before the electrolytic solution is injected into the outer container 2. As shown in FIG.

As shown in FIG. 9, in the verification, in step S1, the resistance values of all the electrode groups 3A having the configuration of the comparative example became smaller than 10 kΩ, and it was determined that all the electrode groups 3A were non-defective products. On the other hand, in each of steps S1 to S4, the resistance values of all the electrode groups 3 having the configuration of this embodiment became 10 kΩ or more, and all the electrode groups 3 were determined to be non-defective products. Actually, in each of stages S1 to S4, the resistance values of all electrode groups 3 became 1 MΩ or more. Therefore, the verification results also prove that electrical insulation between the positive electrode 11 and the negative electrode 12 is ensured in the electrode group 3 of the present embodiment.

Further, in the present embodiment, the negative electrode base material 12A and the insulating layer 13, which become the negative electrode 12, are integrally formed, and the negative electrode base material 12A and the insulating layer 13 are adjacent to the electrode plates 15, respectively. The electrode group 3 is formed by extending in a zigzag manner through the gap between the two electrodes. Therefore, there is no need to punch out a negative electrode substrate to form a plurality of electrode plates (negative plates), and there is no need to form an insulating layer on each of the punched electrode plates (negative plates). Therefore, the electrode group 3 is easily formed. Therefore, the battery 1 is easily manufactured.

Further, in this embodiment, the insulating layer 13 is formed integrally with the negative electrode 12 as a separator between the positive electrode 11 and the negative electrode 12 . Therefore, the thickness of the insulating layer 13, which is a separator, is reduced. Actually, when an insulating sheet separate from the positive electrode 11 and the negative electrode 12 is formed as a separator, the thickness of the separator is 15 μm to 20 μm. Become. By thinning the insulating layer 13, it becomes possible to thicken each of the positive electrode active material-containing layer 42 and the negative electrode active material-containing layer 46, and in the electrode group 3, it is possible to increase the positive electrode active material and the negative electrode active material. It becomes possible. This makes it possible to increase the capacitance of the electrode group 3 .

In addition, in the electrode group 3 having the configuration of the present embodiment, it has been verified that when the amount per unit area of the organic fibers forming the insulating layer 13 falls within an appropriate range, the discharge capacity also falls within an appropriate range. .

(Modified example, etc.)
10 and 11, in addition to the insulating layer 13 integral with the negative electrode 12, each surface of the electrode plate 15 of the positive electrode 11 is also coated with an insulator (one corresponding to 51). ) is placed. Each of insulators 51 is sandwiched between a corresponding electrode plate (a corresponding one of 15 ) and insulating layer 13 . The insulator 51 has electrical insulation. Materials for forming the insulator 51 include materials similar to those for the insulating layer 13 . Therefore, insulator 51 may be formed from organic fibers, inorganic materials, or a mixture of organic fibers and inorganic materials. In particular, by combining the insulating layer 13 of an organic material with the insulator 51 of an inorganic material, it is possible to suppress self-discharge while keeping the battery resistance low. Further, each of the insulators 51 may be a layer integrated with the corresponding electrode plate (one corresponding one of 15), or may be an insulating sheet or the like separate from each of the negative electrode 12 and the electrode plate 15. good too. Here, FIG. 10 shows a cross section corresponding to the Z1-Z1 cross section in FIG. 2, and FIG. 11 shows a cross section corresponding to the Z2-Z2 cross section in FIG.

In this modification, the insulator 51 covers a portion of the positive electrode active material containing layer 42 and a part of the positive electrode current collecting tab 43 on each surface of the electrode plate 15 . However, on each of the electrode plates 15, the longitudinal edges 23, 24 and the lateral edges 25, 26 are not covered with an insulating layer.

Moreover, in the second modification shown in FIG. 12, the electrode group 3 is housed in an outer can 81 instead of the outer container 2 made of a laminate film. In this modification, a lid 82 is attached to the opening of the outer can 81 , and the lid 82 is provided with a positive terminal 83 and a negative terminal 84 . A positive electrode lead 85 and a negative electrode lead 86 are arranged inside the outer can 81 . In this modification, for example, the electrode group 3 is accommodated in the outer can 81 in a state in which the projecting direction of the positive electrode current collecting tab 43 and the projecting direction of the negative electrode current collecting tab 47 are parallel or substantially parallel to the longitudinal direction of the lid 82. be done. The positive collector tab 43 is electrically connected to the positive terminal 83 via a positive backup lead (not shown) and a positive lead 85 . Similarly, the negative collector tab 47 is electrically connected to the negative terminal 84 via a negative backup lead (not shown) and a negative lead 86 . Inside the outer can 81 , the electrode group 3 is impregnated with an electrolytic solution (not shown).

The outer can 81 is made of, for example, aluminum or an aluminum alloy, and the aluminum alloy is preferably an alloy containing elements such as Mg, Zn and Si. Also, the lid 82 is made of aluminum, an aluminum alloy, or the like. Each of the positive electrode lead 85 and the negative electrode lead 86 is a strip-shaped conductive plate, and is made of, for example, aluminum or an aluminum alloy. Further, each of the positive electrode terminal 83 and the negative electrode terminal 84 is made of, for example, aluminum or an aluminum alloy, and the aluminum alloy contains at least one element of Mg, Ti, Zn, Mn, Fe, Cu and Si. . An exterior portion similar to the exterior can 81 and the lid 82 of this modified example is disclosed in Patent Document 2, for example.

In addition, in the third modification shown in FIG. 13, the electrode group 3 is housed inside a stainless outer container 90 . The exterior container 90 includes a box member 91 and a lid member 92 . Here, in the outer container 90, the longitudinal direction, the width direction perpendicular or substantially perpendicular to the longitudinal direction, and the thickness perpendicular or substantially perpendicular to the longitudinal direction and perpendicular and substantially perpendicular to the width direction direction. The box member 91 opens toward one side in the thickness direction. The lid member 92 is attached to the opening of the box member 91 .

In this modification, a recess 93 is formed at one end of the box member 91 in the longitudinal direction of the outer container 90 , and a recess 94 is formed at the other end of the box member 91 in the longitudinal direction of the outer container 90 . A positive electrode terminal 95 is provided in the concave portion 93 and a negative electrode terminal 96 is provided in the concave portion 94 . In this modification, for example, the electrode group 3 is inserted into the outer container 90 in a state in which the projecting direction of the positive electrode current collecting tab 43 and the projecting direction of the negative electrode current collecting tab 47 are parallel or substantially parallel to the longitudinal direction of the outer container 90. be housed. The positive current collecting tab 43 is electrically connected to the positive terminal 95 via a plurality of positive leads (not shown). Similarly, the negative collector tab 47 is electrically connected to the negative terminal 96 via a plurality of negative leads (not shown). Inside the outer container 90 , the electrode group 3 is impregnated with an electrolytic solution (not shown). An exterior portion similar to that of the exterior container 90 of this modified example is disclosed in Patent Document 3, for example.

In addition, in the above-described embodiments and the like, the positive electrode current collecting tab 43 and the negative electrode current collecting tab 47 in the electrode group 3 protrude in opposite directions to each other, but the present invention is not limited to this. In the fourth modification shown in FIGS. 14 and 15, in the electrode group 3, the side from which the positive electrode current collecting tab 43 projects is the same as the side from which the negative electrode current collecting tab 47 projects. In this modification, as in the above-described embodiment, each vertical edge 23 of the electrode plate 15 is provided with a projecting portion 27 projecting outward in the horizontal direction. A positive current collecting tab 43 is formed by the portion 27 and its vicinity. However, in this modification, in each electrode plate 15 , the lengthwise dimension of the projecting portion 27 is half or less of the total lengthwise dimension of the electrode plate 15 . In each of the electrode plates 15, for example, the protruding portion 27 extends only in a region near the lateral edge 25 with respect to the center position in the vertical direction, and extends at the lateral edge 26 with respect to the center position in the vertical direction. No projecting portion 27 extends in the region on the near side.

In addition, in this modification, a plurality of protruding portions 37 that protrude outward in the width direction are provided on the long edge 33 and the vicinity thereof in the negative electrode 12 . The protruding portions 37 are arranged apart from each other in the longitudinal direction, and the negative electrode active material containing layer 46 is not supported on each of the protruding portions 37 . In the negative electrode 12 , the projecting portion 37 forms a negative electrode current collecting tab 47 . In this modified example, the insulating layer 13 is formed integrally with the negative electrode 12 as in the above-described embodiments and the like. The insulating layer 13 covers a portion of the surface of the negative electrode 12 where the negative electrode active material containing layer 46 is carried, and also covers a part of the negative electrode current collecting tab 47 . Therefore, in this modification, each of the projecting portions 37 is partially covered with the insulating layer 13 .

In this modification, as in the above-described embodiment, the negative electrode 12 and the insulating layer 13 pass between each of the electrode plates 15 and adjacent electrode plates (one or two corresponding to 15), Each of the electrode plates 15 extending in a zigzag shape is sandwiched between insulating layers 13 . Then, on each of the electrode plates 15, the negative electrode 12 and the insulating layer 13 are folded back on the side corresponding to the lateral edges 25 and . However, in this modified example, the negative electrodes 12 are extended in the electrode group 3 in a state where the longitudinal edges 23 of the electrode plates 15 and the long edges 33 of the negative electrodes 12 are aligned with each other. Therefore, in this modification, the side from which the positive electrode current collecting tab 43 projects is the same as the side from which the negative electrode current collecting tab 47 projects. In addition, in this modification, the negative electrode current collecting tab 47 is positioned away from the positive electrode current collecting tab 43 in each of the longitudinal directions of the electrode plate 15, and the positive electrode current collecting tab 43 and the negative electrode current collecting tab 47 do not contact each other. is prevented. For example, the positive electrode current collecting tabs 43 are arranged in a region closer to the lateral edge 25 than the central position in each vertical direction of the electrode plate 15 , and the negative electrode current collecting tabs 47 are arranged in each vertical direction of the electrode plate 15 . In terms of direction, it is arranged in the region on the side closer to the lateral edge 26 with respect to the central position.

Also in this modified example, as shown in FIG. 15, the negative electrode 12 is formed from the negative electrode base material 12A similar to that of the above-described embodiment. However, in this modification, before forming the insulating layer 13 on the negative electrode base material 12A, part of the active material non-supporting portion 47A is cut off by cutting or the like on the negative electrode base material 12A. As a result, a plurality of projecting portions 37 are formed by the active material non-supporting portion 47A on which the negative electrode active material containing layer 46 is not supported. The projecting portions 37 are arranged apart from each other in the longitudinal direction of the negative electrode substrate 12A.

In this modification, the insulating layer 13 is formed integrally with the negative electrode substrate 12A by an electrospinning method or the like in a state where the projecting portion 37 is formed. Also in this modification, the insulating layer 13 is covered with the insulating layer 13 at least at portions other than the active material non-supporting portion 47A (projecting portion 37). Also in this modified example, a portion of the active material non-supporting portion 47A is covered with the insulating layer 13 . In this modification, the insulating layer 13 covers the portion of each projecting portion 37 that is closer to the negative electrode active material containing layer 46 . Also in this modified example, the negative electrode substrate 12A integrally formed with the insulating layer 13 is cut into a predetermined length in the longitudinal direction to form the negative electrode 12 . In FIG. 15, the negative electrode 12 is formed by cutting the negative electrode base material 12A along broken lines A1 and A2. Thereby, the negative electrode 12 integrated with the insulating layer 13 is formed. Further, in the electrode group 3, for example, the portion indicated by the dashed line B1 in FIG. 15 is mountain-folded, and the portion indicated by the dashed line B2 in FIG. 15 is valley-folded. 15 shows a step of forming the protruding portion 37 and the insulating layer 13 on the negative electrode base material 12A and cutting the negative electrode base material 12A on which the insulating layer 13 is formed to form the negative electrode 12. FIG. In FIG. 15, the negative electrode active material containing layer 46 is indicated by hatching with dots, and the insulating layer 13 is indicated by hatching with oblique lines.

Further, in the above-described embodiments and the like, the positive electrode 11 is the first electrode formed from the plurality of electrode plates 15, and the negative electrode 12 is the second electrode integrally formed with the insulating layer 13, but this is not the only option. not a thing In one modification, the negative electrode 12 is the first electrode formed from a plurality of electrode plates, and the positive electrode 11 is the second electrode integrally formed with the insulating layer 13 . In this case, the positive electrode 11 passes between each of the electrode plates and the adjacent electrode plate and extends in a zigzag pattern, and the insulating layer 13 extends integrally with the positive electrode 11 in a zigzag pattern. Also in this case, the same actions and effects as those of the above-described embodiment and the like are obtained.

According to the battery of at least one of these embodiments or examples, the first electrode has a plurality of electrode plates, and the second electrode is covered with an insulating layer at least at a portion other than the current collecting tab. The second electrode and the insulating layer extend in a zigzag pattern between each of the electrode plates and the adjacent electrode plate. Therefore, the insulation between the first electrode and the second electrode in the electrode group is appropriately ensured, and a battery that can be easily manufactured can be provided.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.
The matters described in the scope of claims at the time of filing of the present application are added below.
[1] A first electrode comprising a plurality of electrode plates arranged side by side and being one of a positive electrode and a negative electrode;
The electrode plate includes a current collecting tab formed by one of the long edges and a portion adjacent thereto, and is the other of the positive electrode and the negative electrode different from the first electrode, and is adjacent to each of the electrode plates. a second electrode extending in a zigzag pattern through the
extending in the zigzag shape integrally with the second electrode, covering at least a portion of the surface of the second electrode other than the current collecting tab, and sandwiching each of the electrode plates of the first electrode an insulating layer;
A battery comprising:
[2] The battery of [1], further comprising an insulator disposed on each surface of the electrode plate in the first electrode and sandwiched between the corresponding electrode plate and the insulating layer.
[3] The battery of [1] or [2], wherein the insulating layer covers part of the current collecting tab on the surface of the second electrode.
[4] The battery according to any one of [1] to [3], wherein the insulating layer is in close contact with the second electrode on the surface of the second electrode.
[5] The battery according to any one of [1] to [4], wherein the insulating layer is made of organic fibers.
[6] A first electrode base material that serves as a base material for a first electrode that is one of a positive electrode and a negative electrode, and a second electrode that is the other of the positive electrode and the negative electrode that is different from the first electrode. forming a second electrode base material as a base material;
forming a plurality of electrode plates by punching the first electrode substrate;
forming an insulating layer integrally with the second electrode base on the surface of the second electrode base, and covering at least one of the long edges of the surface of the second electrode base and a portion other than a portion in the vicinity thereof; covering with the insulating layer;
The second electrode integrally formed with the insulating layer extends in a zigzag pattern through each of the electrode plates and the adjacent electrode plate, and each of the electrode plates is separated by the insulating layer. pinching and
A method for manufacturing a battery comprising:
[7] Forming the insulating layer on the second electrode substrate comprises forming the insulating layer of organic fibers on the surface of the second electrode substrate by electrospinning, [6 ] manufacturing method.

DESCRIPTION OF SYMBOLS 1... Battery 3... Electrode group 11... Positive electrode 12... Negative electrode 11A... Positive electrode base material 12A... Negative electrode base material 13... Insulating layer 15... Electrode plate 33, 34... Long edge 43... Positive electrode collection Current tab, 47... Negative electrode current collecting tab, 51... Insulator.

Claims (6)

a first electrode comprising a plurality of electrode plates arranged side by side and being one of a positive electrode and a negative electrode;
a current collector, and an active material-containing layer supported on a surface of the current collector, and a portion of the current collector where the active material-containing layer is not supported on the surface; and is different from the first electrode of the positive electrode and the negative electrode, and passes between each of the electrode plates and the adjacent electrode plate in a zigzag shape a second electrode extending to
extending in the zigzag shape integrally with the second electrode, covering at least a portion of the surface of the second electrode other than the current collecting tab, and sandwiching each of the electrode plates of the first electrode an insulating layer;
an insulator disposed on each surface of the electrode plate in the first electrode and sandwiched between the corresponding electrode plate and the insulating layer;
and
The first distance from the one of the long edges of the second electrode to the end of the active material-containing layer of the second electrode on the side where the current collecting tab of the second electrode is located is the greater than a second distance from the one of the long edges of the second electrode to the end of the insulating layer on the side on which the one of the long edges of the second electrode is located;
battery. 2. The battery of claim 1 , wherein said insulating layer covers a portion of said current collecting tab at said surface of said second electrode. 3. The battery of claim 1 , wherein the insulating layer is in close contact with the second electrode at the surface of the second electrode. 4. The battery according to any one of claims 1 to 3 , wherein said insulating layer is formed of organic fibers. A first electrode base material serving as a base material for a first electrode that is one of a positive electrode and a negative electrode, and a base material for a second electrode that is the other of the positive electrode and the negative electrode that is different from the first electrode. Forming a second electrode base material comprising forming a current collector and an active material-containing layer supported on the surface of the current collector in the formation of the second electrode base material forming a current collecting tab on one of the long edges of the second electrode substrate and a portion in the vicinity thereof as a portion of the current collector where the active material-containing layer is not supported on the surface;
forming a plurality of electrode plates by punching the first electrode substrate;
forming an insulating layer integrally with the second electrode base material on the surface of the second electrode base material, and at least a portion of the surface of the second electrode base material other than the one long edge and a portion in the vicinity thereof; with the insulating layer, wherein from the one of the long edges of the second electrode substrate to the active material-containing layer of the second electrode substrate, the collection of the second electrode substrate A first distance from the one of the long edges of the second electrode substrate to the end of the side on which the electrical tab is located is the distance from the one of the long edges of the second electrode substrate in the insulating layer increasing compared to a second distance to the edge of the located side;
The second electrode integrally formed with the insulating layer extends in a zigzag pattern through each of the electrode plates and the adjacent electrode plate, and each of the electrode plates is separated by the insulating layer. pinching and
arranging an insulator on each surface of the electrode plate serving as the first electrode so that the insulator is sandwiched between the corresponding electrode plate and the insulating layer;
A method for manufacturing a battery comprising: 6. The manufacture of claim 5 , wherein forming the insulating layer on the second electrode substrate comprises forming the insulating layer of organic fibers on the surface of the second electrode substrate by electrospinning. Method.

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