Battery

Abstract

The invention relates to a battery. The conventional battery still has room for improvement in the aspect of improving the structural efficiency. A battery according to the present disclosure has a power generation unit and a current collection unit including an electrode mixture. In a battery, for example, in the current collector, a layer containing the electrode mixture can be bent together with a current collector.

Description

Technical Field

[0001] The present application discloses a battery. Background Art

[0002] Patent Document 1 discloses a battery in which a power generation portion and a terminal portion are electrically connected via a current collecting portion (a collector portion). Patent Document 2 discloses an electrode for a laminated battery having an electrode laminate portion and an electrode terminal portion.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-160525

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2019-207746 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] Conventional batteries still have room for improvement in terms of increasing structural efficiency (volume efficiency).

[0009] Means for solving problems

[0010] As means for solving the above-mentioned problems, the present application discloses the following multiple solutions.

[0011] Option 1

[0012] A battery comprises a power generation section and a power collection section, wherein the power collection section includes an electrode composite.

[0013] Option 2

[0014] The battery according to claim 1, wherein in the current collecting portion, the layer including the electrode composite material is curved together with the current collector.

[0015] Option 3

[0016] The battery according to claim 2, wherein the layer that bends together with the current collector includes a sagging portion.

[0017] Option 4

[0018] The battery according to aspect 2 or 3, wherein the end portion of the layer bent together with the current collector is protected by a resin.

[0019] Option 5

[0020] The battery according to any one of aspects 1 to 4, wherein the power generation section includes a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer.

[0021] Option 6

[0022] The battery according to any one of aspects 1 to 5, wherein the current collecting portion includes a positive electrode composite material.

[0023] Effects of the Invention

[0024] The battery of the present disclosure has high structural efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The cross-sectional structure of the battery is schematically shown, and the structure other than the power generation section and the power collection section is omitted.

[0026] Figure 2 The cross-sectional structure of the electrode body constituting the power generation section and the power collection section is schematically shown.

[0027] Description of Reference Numerals

[0028] 100 batteries

[0029] 10 Power Generation Department

[0030] 10x One end face in stacking direction

[0031] 10y The other end surface in the stacking direction

[0032] 10z Side

[0033] 11 Electrode body

[0034] 11a First electrode current collector

[0035] 11b First electrode active material layer

[0036] 11bx hanging part

[0037] 11c electrolyte layer

[0038] 11cx drooping part

[0039] 11d Second electrode active material layer

[0040] 11e Second electrode current collector

[0041] 11f Resin

[0042] 20 Current collection unit DETAILED DESCRIPTION

[0043] An embodiment of the battery of the present disclosure will be described below, but the battery of the present disclosure is not limited to the following embodiment.

[0044] like Figure 1 and 2As shown, a battery 100 according to one embodiment includes a power generation section 10 and a power collection section 20. The power collection section 20 includes an electrode composite.

[0045] 2.1 Power Generation Department

[0046] The power generation unit 10 includes an electrode body 11 as a power generation element. The power generation unit 10 may be formed by stacking a plurality of electrode bodies 11.

[0047] like Figure 2 As shown, the electrode body 11 may include a first electrode current collector 11a, a first electrode active material layer 11b comprising a first electrode composite, an electrolyte layer 11c, a second electrode active material layer 11d comprising a second electrode composite, and a second electrode current collector 11e. In this case, the first electrode may be a positive electrode and the second electrode may be a negative electrode. Alternatively, the first electrode may be a negative electrode and the second electrode may be a positive electrode. One or both of the first electrode current collector 11a and the second electrode current collector 11e may protrude from the side surface 10z of the power generation unit 10. Figure 1 exemplifies a configuration in which a plurality of first electrode current collectors 11a protrude from the side surface 10z of the power generation section 10. The current collectors protruding from the side surface 10z of the power generation section 10 may be bent, bundled together, or the like to form the power collection section 20 described later.

[0048] There is no particular limitation on the number of stacked electrode bodies 11 in the power generation section 10. The power generation section 10 may have a bipolar structure in part. In addition, in the power generation section 10, an insulating layer or the like may be provided between one electrode body 11 and another electrode body 11 to insulate the stacked surfaces of the electrode bodies 11 from each other. Figure 1 As shown, the plurality of electrode bodies 11 can be electrically connected to each other using the current collecting portion 20. For example, the plurality of electrode bodies 11 can be electrically connected to each other in parallel using the current collecting portion 20.

[0049] The power generation section 10 may include an end face 10x on one side of the stacking direction of each layer described later, another end face 10y on the other side of the stacking direction, and a side face 10z connecting the one end face 10x and the other end face 10y. The side face 10z may be formed by the outer edges of each layer constituting the power generation section 10. In the power generation section 10, the side face 10z may have unevenness and gaps due to the difference in the stacking area of each layer. In addition, the side face 10z may have a surface along the stacking direction of each layer in the power generation section 10. In addition, the collector section 20 described later may be composed of a collector 11a protruding from the side face 10z of the power generation section 10. The power generation section 10 may be, for example, plate-shaped or rectangular as a whole.

[0050] like Figure 1 As shown, the power generation portion 10 may have a thickness T in the stacking direction of each layer. The thickness T may be, for example, 5 mm to 300 mm, or 10 mm to 50 mm.

[0051] The following example illustrates a case where the first electrode of the electrode body 11 constituting the power generation unit 10 is a positive electrode and the second electrode is a negative electrode. In one embodiment, the power generation unit 10 may include a positive electrode active material layer 11b, a solid electrolyte layer 11c, and a negative electrode active material layer 11d. Alternatively, in one embodiment, the power generation unit 10 may include a positive electrode active material layer 11b, a liquid electrolyte layer 11c, and a negative electrode active material layer 11d. In particular, when the power generation unit 10 includes a positive electrode active material layer 11b, a solid electrolyte layer 11c, and a negative electrode active material layer 11d, the structural efficiency is likely to be further improved. The shape of the stacking surface of each layer constituting the power generation unit 10 may be, for example, rectangular.

[0052] 2.1.1 Positive electrode active material layer

[0053] The positive electrode active material layer 11b contains a positive electrode active material and may further optionally contain an electrolyte, a conductive additive, a binder, etc. The content of each of the positive electrode active material, electrolyte, conductive additive, binder, etc. in the positive electrode active material layer 11b can be appropriately determined according to the target battery performance. For example, when the entire positive electrode active material layer 11b (the entire solid component) is set to 100 mass%, the content of the positive electrode active material can be greater than 40 mass%, greater than 50 mass%, or greater than 60 mass%, or less than 100 mass%, or less than 90 mass%. There is no particular limitation on the shape of the positive electrode active material layer 11b. For example, it can be a sheet-shaped positive electrode active material layer 11b with a roughly flat surface. There is no particular limitation on the thickness of the positive electrode active material layer 11b. For example, it can be greater than 0.1 μm or greater than 1 μm, or less than 2 mm or less than 1 mm.

[0054] As for the positive electrode active material, any positive electrode active material known as a positive electrode active material for a battery can be used. When lithium ions are used as carrier ions, the positive electrode active material may be, for example, an oxide containing Li. Specifically, the positive electrode active material may be an oxide containing Li comprising at least one element M, Li, and O. Element M may be, for example, at least one selected from Mn, Ni, Co, Al, Mg, Ca, Sc, V, Cr, Cu, Zn, Ga, Ge, Y, Zr, Sn, Sb, W, Pb, Bi, Fe, and Ti, and may be at least one selected from Mn, Ni, Co, Al, Fe, and Ti. More specifically, the oxide containing Li as other positive electrode active materials may be selected from lithium cobaltate, lithium nickelate, lithium manganate, lithium nickel cobaltate, lithium nickel manganate, lithium cobalt manganate, lithium nickel cobalt manganate (Li 1±α Ni x Co y Mn z O 2±δ (e.g. 0<x<1, 0<y<1, 0<z<1, x+y+z=1)), spinel lithium compounds (composed of Li1+ x Mn 2-x-y M y O4 (M is one or more selected from Al, Mg, Co, Fe, Ni and Zn) represented by the composition of the heterogeneous element substitution Li-Mn spinel, etc.), lithium nickel cobalt aluminum oxide (such as Li 1±α Ni p Co q Al r O 2±δ (e.g. p+q+r=1)), lithium titanate, lithium metal phosphate (LiMPO4, etc., M is one or more selected from Fe, Mn, Co and Ni), etc. At least one of the above. The positive electrode active material may be used alone or in combination of two or more. As for the shape of the positive electrode active material, any shape that is generally used as a positive electrode active material for a battery may suffice. The positive electrode active material may be, for example, in the form of particles. The positive electrode active material may be a primary particle, or a secondary particle formed by the aggregation of multiple primary particles. The average particle size D50 of the positive electrode active material may be, for example, greater than 1 nm, greater than 5 nm or greater than 10 nm, and may be less than 500 μm, less than 100 μm, less than 50 μm or less than 30 μm. It should be noted that the average particle size D50 referred to in this application is the particle size (median diameter) at 50% of the cumulative value in the volume-based particle size distribution determined by the laser diffraction and scattering method. An ion-conductive protective layer may be formed on the surface of the positive electrode active material. The ion-conductive protective layer may contain various ion-conductive compounds, such as at least one compound selected from ion-conductive oxides and ion-conductive halides.

[0055] The electrolyte contained in the positive electrode active material layer 11b may be a solid electrolyte, a liquid electrolyte, or a combination thereof. In particular, when the positive electrode active material layer 11b contains a solid electrolyte, structural efficiency is easily improved.

[0056] As for the solid electrolyte that can be contained in the positive electrode active material layer 11b, any known solid electrolyte with ion conductivity can be used. The solid electrolyte can be an inorganic solid electrolyte or an organic polymer electrolyte. In particular, inorganic solid electrolytes have excellent ion conductivity and heat resistance. Examples of inorganic solid electrolytes include oxide solid electrolytes, sulfide solid electrolytes, and ionically bonded inorganic solid electrolytes. Among inorganic solid electrolytes, sulfide solid electrolytes, and further sulfide solid electrolytes containing at least Li, S, and P as constituent elements, have high performance. Alternatively, among inorganic solid electrolytes, ionically bonded solid electrolytes, and further solid electrolytes containing at least Li, Y, and halogen (at least one of Cl, Br, I, and F) as constituent elements, have high performance. The solid electrolyte can be amorphous or crystalline. The solid electrolyte can be in particulate form. The average particle size D50 of the solid electrolyte can be, for example, not less than 10 nm and not more than 10 μm.

[0057] The liquid electrolyte (electrolyte) that may be contained in the positive electrode active material layer 11b is a liquid containing carrier ions. The carrier ions may be, for example, lithium ions. The electrolyte may be an aqueous electrolyte or a non-aqueous electrolyte. The composition of the electrolyte is well known. The electrolyte may be a product obtained by dissolving a lithium salt in water or a non-aqueous solvent. Examples of non-aqueous solvents include various carbonate-based solvents. Examples of lithium salts include lithium amide salts and LiPF6.

[0058] Examples of conductive additives that may be included in the positive electrode active material layer 11b include carbon materials such as vapor-grown carbon fiber (VGCF), acetylene black (AB), Ketjen black (KB), carbon nanotubes (CNTs), and carbon nanofibers (CNFs); and metal materials such as nickel, titanium, aluminum, and stainless steel. The conductive additive may be in the form of particles or fibers, and its size is not particularly limited. One conductive additive may be used alone, or two or more may be used in combination.

[0059] Examples of binders that may be included in the positive electrode active material layer 11 b include butadiene rubber (BR)-based binders, butylene rubber (IIR)-based binders, acrylate butadiene rubber (ABR)-based binders, styrene butadiene rubber (SBR)-based binders, polyvinylidene fluoride (PVdF)-based binders, polytetrafluoroethylene (PTFE)-based binders, and polyimide (PI)-based binders. These binders may be used alone or in combination of two or more.

[0060] 1.1.2 Electrolyte layer

[0061] The electrolyte layer 11c is arranged between the positive electrode active material layer 11b and the negative electrode active material layer 11d. The electrolyte layer 11c contains at least an electrolyte and may further optionally contain a binder, etc. There is no particular limitation on the content of the electrolyte and binder, etc. in the electrolyte layer 11c. Alternatively, the electrolyte layer 11c may have a separator, etc. for preventing contact between the positive electrode active material layer 11b and the negative electrode active material layer 11d while retaining the electrolyte. There is no particular limitation on the thickness of the electrolyte layer 11c, for example, it may be greater than 0.1 μm or greater than 1 μm, and may be less than 2 mm or less than 1 mm.

[0062] The electrolyte contained in the electrolyte layer 11c can be appropriately selected from the electrolytes (solid electrolytes and / or liquid electrolytes) exemplified as the electrolytes that can be contained in the above-mentioned positive electrode active material layer 11b. In addition, the binder that can be contained in the electrolyte layer 11c can also be appropriately selected from the binders exemplified as the binders that can be contained in the above-mentioned positive electrode active material layer. Electrolytes and binders can be used alone or in combination of two or more. The diaphragm (separator) can be any diaphragm commonly used in batteries, for example, diaphragms made of resins such as polyethylene (PE), polypropylene (PP), polyester and polyamide. The diaphragm can be a single-layer structure or a multi-layer structure. As a multi-layer structure diaphragm, for example, a 2-layer structure diaphragm of PE / PP, or a 3-layer structure diaphragm of PP / PE / PP or PE / PP / PE can be listed. The diaphragm can be made of non-woven fabrics such as cellulose non-woven fabrics, resin non-woven fabrics, and glass fiber non-woven fabrics.

[0063] 1.1.3 Negative electrode active material layer

[0064] The negative electrode active material layer 11d contains a negative electrode active material and may further optionally contain an electrolyte, a conductive aid, a binder, etc. The content of each of the negative electrode active material, electrolyte, conductive aid, binder, etc. in the negative electrode active material layer 11d can be appropriately determined according to the target battery performance. For example, when the entire negative electrode active material layer 11d (the entire solid component) is set to 100 mass%, the content of the negative electrode active material may be 40 mass% or more, 50 mass% or more, or 60 mass% or more, or 100 mass% or less, or 90 mass% or less. There is no particular limitation on the shape of the negative electrode active material layer 11d. For example, it may be a sheet-shaped negative electrode active material layer 11d having a roughly flat surface. There is no particular limitation on the thickness of the negative electrode active material layer 11d. For example, it may be 0.1 μm or more or 1 μm or more, or 2 mm or less, or 1 mm or less.

[0065] As for the negative electrode active material, any negative electrode active material known as a negative electrode active material for a battery can be used. Among the known active materials, various materials whose potential for absorbing and releasing ions (charge and discharge potential) is lower than that of the above-mentioned positive electrode active materials can be used. When lithium ions are used as ions, as negative electrode active materials, for example, silicon-based active materials such as Si, Si alloys, and silicon oxide; carbon-based active materials such as graphite and hard carbon; various oxide-based active materials such as lithium titanate; metallic lithium, lithium alloys, etc. can be used. Only one type of negative electrode active material can be used alone, or two or more types can be used in combination. The shape of the negative electrode active material can be any shape that is generally used as a negative electrode active material for a battery. For example, the negative electrode active material can be in the form of particles. The negative electrode active material particles can be primary particles or secondary particles formed by the aggregation of multiple primary particles. The average particle size D50 of the negative electrode active material particles can be, for example, 1 nm or more, 5 nm or more, or 10 nm or more, and can also be 500 μm or less, 100 μm or less, 50 μm or less, or 30 μm or less. Alternatively, the negative electrode active material can be in a sheet form (foil or film) such as lithium foil. In other words, the negative electrode active material layer 11d can be composed of a sheet of negative electrode active material.

[0066] Examples of the electrolyte that may be contained in the negative electrode active material layer 11d include the above-mentioned solid electrolytes, electrolyte solutions, or combinations thereof. The conductive aid that may be contained in the negative electrode active material layer 11d may be appropriately selected from the conductive aids exemplified as the conductive aids that may be contained in the above-mentioned positive electrode active material layer. The binder that may be contained in the negative electrode active material layer 11d may be appropriately selected from the binders exemplified as the binders that may be contained in the above-mentioned positive electrode active material layer. The electrolyte, conductive aid, and binder may each be used alone or in combination of two or more.

[0067] 1.1.4 Positive electrode collector

[0068] like Figure 1 and 2As shown, battery 100 may include a positive electrode current collector 11a in contact with positive electrode active material layer 11b. A portion of positive electrode current collector 11a may protrude from power generation section 10 to form current collecting section 20. Positive electrode current collector 11a may be any common positive electrode current collector for batteries. Positive electrode current collector 11a may have a shape selected from at least one of foil, plate, mesh, punched metal, and foam. Positive electrode current collector 11a may be made of metal foil or metal mesh. Metal foil, in particular, offers excellent handleability. Positive electrode current collector 11a may be made of multiple sheets of foil. Examples of metals comprising positive electrode current collector 11a include at least one selected from the group consisting of Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, V, Mg, Pb, Ge, In, Sn, Zr, and stainless steel. In particular, from the perspective of ensuring oxidation resistance, the positive electrode current collector 11a may contain Al. The positive electrode current collector 11a may have some coating on its surface for the purpose of adjusting resistance, etc. For example, the positive electrode current collector 11a may have a carbon coating. In addition, the positive electrode current collector 11a may be a product in which the above-mentioned metal is plated or evaporated on a metal foil or a substrate. In addition, when the positive electrode current collector 11a is composed of a plurality of metal foils, there may be some layers between the plurality of metal foils. There is no particular limitation on the thickness of the positive electrode current collector 11a. For example, it may be greater than 0.1 μm or greater than 1 μm, and may be less than 1 mm or less than 100 μm.

[0069] 1.1.5 Negative electrode collector

[0070] like Figure 1 and 2As shown, battery 100 may include a negative electrode current collector 11e in contact with negative electrode active material layer 11d. A portion of negative electrode current collector 11e may protrude from power generation section 10, thereby forming a current collecting section distinct from current collecting section 20 described above. Any common negative electrode current collector used for a battery can be used for negative electrode current collector 11e. Furthermore, negative electrode current collector 11e may be in the form of a foil, plate, mesh, punched metal, or foam. Negative electrode current collector 11e may be a metal foil or metal mesh, or a carbon sheet. Metal foil, in particular, offers excellent handleability. Negative electrode current collector 11e may be composed of multiple foils or sheets. Examples of metals constituting negative electrode current collector 11e include at least one selected from the group consisting of Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, V, Mg, Pb, Ge, In, Sn, Zr, and stainless steel. In particular, from the perspective of ensuring reduction resistance and difficulty in alloying with lithium, the negative electrode collector 11e may contain at least one metal selected from Cu, Ni and stainless steel. The negative electrode collector 11e may have certain coatings on its surface for the purpose of adjusting resistance, etc. For example, the negative electrode collector 11e may have a carbon coating. The negative electrode collector 11e may be an aluminum foil with a carbon coating. In addition, the negative electrode collector 11e may be a product obtained by plating or vapor-depositing the above-mentioned metal on a metal foil or a substrate. In addition, when the negative electrode collector 11e is composed of multiple metal foils, there may be certain layers between the multiple metal foils. There is no particular limitation on the thickness of the negative electrode collector 11e. For example, it may be greater than 0.1 μm or greater than 1 μm, and may be less than 1 mm or less than 100 μm.

[0071] 2. Current collection

[0072] The current collecting section 20 is electrically connected to a plurality of current collectors 11a protruding from the power generating section 10. For example, the current collecting section 20 can be formed by bending the protruding portions of the plurality of current collectors 11a and binding them together.

[0073] In the past, to ensure capacity and insulation, an electrolyte layer was placed on the dripping area of the first electrode active material layer, and then a dripping area of the second electrode active material layer was formed on top of the dripping area and inside the dripping area of the first electrode active material layer. Furthermore, to prevent the electrode active material layer from slipping, the current collector (pole sheet) was formed by bending the outer side of the dripping area. As a result, the efficiency of the structure around the dripping area and the current collector area was reduced.

[0074] In the battery 100 according to the present embodiment, the current collecting portion 20 includes an electrode composite. The so-called "electrode composite" refers to a composite material constituting the electrode body 11, for example, at least one of the positive electrode composite constituting the above-mentioned positive electrode active material layer 11b, the solid electrolyte composite constituting the solid electrolyte layer when the electrolyte layer 11c is a solid electrolyte layer, and the negative electrode composite constituting the negative electrode active material layer 11d. In one embodiment, the current collecting portion 20 may include a positive electrode composite. In addition, in one embodiment, the current collecting portion 20 may include a negative electrode composite. In the case where the current collecting portion 20 includes an electrode composite, the structural efficiency of the current collecting portion 20 can be improved compared to the case where the current collecting portion 20 does not include an electrode composite.

[0075] exist Figure 1 and 2 In the battery 100, as shown in region X, the ends of the positive electrode active material layer 11b, the electrolyte layer 11c, and / or the negative electrode active material layer 11d overflow the current collecting portion 20, and the positive electrode active material layer 11b, the electrolyte layer 11c, and / or the negative electrode active material layer 11d extend to (reach) the curved portion of the current collector 11a in the current collecting portion 20. In other words, in the battery 100, the layer containing the electrode composite (the positive electrode active material layer 11b and / or the negative electrode active material layer 11d) in the current collecting portion 20 can bend together with the current collector 11a.

[0076] In the battery 100 , the layers (the positive electrode active material layer 11 b , the electrolyte layer 11 c , and / or the negative electrode active material layer 11 d ) that are bent together with the current collector 11 a may include a sagging portion. Figure 2 While the positive electrode active material layer 11b and the electrolyte layer 11c are illustrated as having sagging portions 11bx and 11cx, the sagging portions are not limited to these. A "sagging portion" refers to an inclined portion formed at the end of a layer when the layer is formed using a coating method or the like (see, for example, Japanese Patent Application Publication Nos. 2015-220216 and 2014-096302). The sagging portion of a layer is typically thinner than the rest of the layer. Therefore, the sagging portion of the layer is easier to bend than the rest of the layer.

[0077] like Figure 2As shown, in battery 100, the ends of the layers (positive electrode active material layer 11b, electrolyte layer 11c, and / or negative electrode active material layer 11d) that are bent along with current collector 11a are protected by resin 11f. Consequently, even if these layers are bent along with current collector 11a, the ends of these layers are less likely to peel off or slip. The type of resin 11f is not particularly limited, and various curable resins can be used. Resin 11f can be formed at the same time as layers 11b-11d, before layers 11b-11d, or after layers 11b-11d.

[0078] like Figure 1 As shown, the collector portion 20 may include an electrode composite material within a range from the side surface 10z of the power generation portion 10 to the length L1. In addition, the collector portion 20 may have a length L2 from the side surface 10z of the power generation portion 10 to the top of the collector portion 20 (the portion farthest from the side surface 10z of the power generation portion 10 before connection to the terminal). The length L1 may be, for example, greater than 1.0 mm and less than 10.0 mm. The length L2 may be, for example, greater than 1.1 mm and less than 100 mm. The ratio L1 / L2 of the length L1 to the length L2 may be, for example, greater than 0.1 and less than 1. When the dimensions in the collector portion 20 are within these ranges, the structural efficiency of the battery 100 can be easily further improved.

[0079] 3. Other components

[0080] In addition to the above-mentioned structures, the battery 100 may include structures generally used as a battery. For example, terminals, outer packaging bodies, etc. That is, in the case of the battery 100, the above-mentioned collector 20 can be connected to the terminals, and the above-mentioned structures can be housed inside the outer packaging body. As for the terminals, any terminals known as battery terminals can be used. As for the outer packaging body, any outer packaging body known as battery outer packaging bodies can be used. In addition, multiple batteries 100 can be electrically connected arbitrarily, and can be optionally overlapped to form a battery pack. In this case, the battery pack can be housed inside a known battery casing. Examples of the shape of the battery 100 include a coin type and a laminated type. The battery 100 can be a secondary battery. The battery 100 can be an all-solid-state battery.

[0081] 4. Battery Manufacturing Method

[0082] The battery 100 can be manufactured, for example, as follows.

[0083] (1) The positive electrode composite material constituting the positive electrode active material layer is dispersed in a solvent to obtain a positive electrode layer slurry. The solvent used in this case is not particularly limited, and water or various organic solvents can be used. The positive electrode layer slurry is applied to the surface of the positive electrode current collector using a scraper or the like, and then dried to form a positive electrode active material layer on the surface of the positive electrode current collector, thereby producing a positive electrode.

[0084] (2) The negative electrode composite material constituting the negative electrode active material layer is dispersed in a solvent to obtain a negative electrode layer slurry. The solvent used in this case is not particularly limited, and water or various organic solvents can be used. The negative electrode layer slurry is applied to the surface of the negative electrode current collector using a scraper or the like, and then dried to form a negative electrode active material layer on the surface of the negative electrode current collector, thereby producing a negative electrode.

[0085] (3) The layers are stacked so that the electrolyte layer (solid electrolyte layer or separator) is sandwiched between the negative electrode and the positive electrode to obtain an electrode body having a negative electrode collector, a negative electrode active material layer, an electrolyte layer, a positive electrode active material layer, and a positive electrode collector in this order.

[0086] (4) Multiple electrode bodies are stacked to obtain a power generation unit. In this process, multiple current collectors are protruded from the side surfaces of the power generation unit.

[0087] (5) The current collector protruding from the power generation section is bent together with the electrode composite material, and a plurality of current collectors are bundled together to form a current collecting section.

[0088] (6) As needed, other components such as terminals are attached to the current collecting section, and the power generating section and current collecting section are housed in a battery case. In the case of an electrolyte battery, the battery case is filled with electrolyte, each component is impregnated with the electrolyte, and the battery case is sealed to complete the battery. Furthermore, in the case of an electrolyte battery, the negative electrode active material layer, separator, and positive electrode active material layer may contain electrolyte before each component is housed in the battery case.

[0089] 5. Purpose

[0090] Battery 100 has a wide range of applications. For example, battery 100 can be preferably used in at least one vehicle selected from hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs). Specifically, the technology disclosed herein also includes a vehicle equipped with the battery 100 disclosed herein.

Claims

1. A battery comprising a power generation section and a power collection section, wherein the power collection section comprises an electrode composite.

2. The battery according to claim 1, wherein In the current collecting portion, the layer including the electrode composite material is bent together with the current collector.

3. The battery according to claim 2, wherein The layer that bends together with the current collector includes a sagging portion.

4. The battery according to claim 2 or 3, wherein The end portion of the layer that is bent together with the current collector is protected by a resin.

5. The battery according to any one of claims 1 to 4, wherein The power generation section includes a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer.

6. The battery according to any one of claims 1 to 5, wherein The current collecting portion includes a positive electrode composite material.

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