Battery and method for manufacturing a battery

Abstract

The present invention provides a battery in which the electrode body and the case are electrically insulated, and in which the temperature difference within the electrode body is small. [Solution] The battery 1A of the present disclosure comprises an electrode body 10, a case 20 housing the electrode body 10, and a resin body 30A that electrically insulates the electrode body 10 from the case 20. The electrode body 10 includes a positive electrode current collector, a positive electrode active material layer, an electrolyte, a negative electrode active material layer, and a negative electrode current collector. The case 20 has a metal cylindrical body 21 having a first opening R21A and a second opening R21B, and a lid 22 that seals each of the first opening R21A and the second opening R21B. The resin body 30A has a plurality of recessed portions extending from the first opening R21A toward the second opening R21B.

Description

Technical Field

[0001] The present disclosure relates to a battery and a method for manufacturing the battery.

Background Art

[0002] Patent Document 1 discloses a non-aqueous electrolyte secondary battery (hereinafter also referred to as a "battery"). The battery includes a cylindrical case body, a sealing body, and a wound electrode group (hereinafter also referred to as an "electrode body"). The case body has an opening and a bottom. The sealing body is caulked and fixed to the opening of the case body via a gasket. The electrode group is housed in the case body. The electrode group is formed by winding a positive electrode plate and a negative electrode plate with a separator interposed therebetween. A current collector made of a metal foil of one of the positive electrode plate and the negative electrode plate is exposed at at least a part of the outermost peripheral surface of the electrode group in the winding direction. The current collector is in contact with the inner surface of the case body. The arithmetic mean roughness Ra1 of the first region and the arithmetic mean roughness Ra2 of the second region satisfy Ra1 < Ra2. The first region indicates a range from the opening-side end of the inner surface of the case body to the contact position of the bottom-side end of the gasket. The second region indicates a range of the inner surface of the case body that faces the outermost peripheral surface of the electrode group.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the battery is used (i.e., when the battery is charged or discharged), the electrode body is likely to generate heat. In order to efficiently cool the electrode body, it is preferable to thermally connect the cooling mechanism and the case. In order to thermally connect the cooling mechanism and the case, it is preferable that the electrode body and the case are electrically insulated.

[0005] However, when resin is filled between the electrode body and the case, the temperature of the electrode body (hereinafter also referred to as the "operating temperature") may differ in different parts when the battery is in use. If the difference between the operating temperature of the first part of the electrode body and the operating temperature of the second part of the electrode body (hereinafter also referred to as the "operating temperature difference within the electrode body") is large, the battery's durability may decrease. Therefore, there is a need for batteries in which the electrode body and the case are electrically insulated and the operating temperature difference within the electrode body is small.

[0006] This disclosure has been made in light of the circumstances described above. One embodiment of this disclosure aims to solve the problem of a battery in which the electrode body and the case are electrically insulated, and which has a small temperature difference within the electrode body, as well as a method for manufacturing the battery. [Means for solving the problem]

[0007] The following embodiments are included as means for solving the above problems.

[0008] <1> A battery according to a first aspect of this disclosure is An electrode body comprising a positive electrode current collector, a positive electrode active material layer, an electrolyte, a negative electrode active material layer, and a negative electrode current collector, A case for housing the electrode body, A resin body that electrically insulates the electrode body and the case, Equipped with, The case comprises a metal cylinder having a first opening and a second opening, and a lid that closes each of the first and second openings. The resin body is a battery having a plurality of recessed portions extending from the first opening to the second opening.

[0009] In this disclosure, "electrolyte" refers to a substance interposed between the positive electrode active material layer and the negative electrode active material layer that conducts carrier ions. Specifically, examples of electrolytes include solid electrolytes, non-aqueous electrolytes containing lithium salts (e.g., LiPF6), non-aqueous gel electrolytes, or ion-conducting polymers. "Positive electrode active material layer" refers to a layer containing the positive electrode active material. "Negative electrode active material layer" refers to a layer containing the negative electrode active material. "Resin body" refers to a material containing resin and having electrical insulating properties. The electrical resistance of the resin body is 10 10 It may be Ω·m or greater. "Metal cylinder" refers to a cylindrical metal container. "Recessed area" refers to a part of the resin body on the case side of a battery that is not in physical contact with the case.

[0010] In the first embodiment, the resin body has a plurality of recessed portions extending from the first opening of the metal cylinder to the second opening of the metal cylinder. In other words, the resin body has portions that are not in contact with the metal cylinder (i.e., recessed portions) (hereinafter also referred to as "non-contact portions") and portions that are in contact with the metal cylinder (hereinafter also referred to as "contact portions"). In the non-contact portions, the resin body and air are interposed between the resin body and the metal cylinder. Therefore, heat from the electrode body is less likely to transfer to the metal cylinder in the non-contact portions. In the contact portions, the resin body is interposed between the resin body and the metal cylinder, but air is not interposed. Therefore, heat from the electrode body is more likely to transfer to the metal cylinder in the contact portions. The positions of the plurality of recessed portions can be appropriately adjusted according to the configuration of the electrode body. As a result, the battery of the first embodiment is a battery in which the electrode body and the case are electrically insulated, and the operating temperature difference within the electrode body is small.

[0011] <2> A battery according to a second aspect of this disclosure is The first percentage is higher than the second percentage. The first ratio represents the ratio of the total area of ​​the multiple recessed portions in the first opening portion of the resin body to the area of ​​the first opening portion, The second ratio represents the ratio of the total area of ​​the multiple recessed portions in the second opening portion of the resin body to the area of ​​the second opening portion, <1> This is the battery described in [the document].

[0012] The electrode body may include an electrode body and a current collecting tab electrically connected to the electrode body. "The portion of the resin body on the first opening side" refers to the portion of the resin body facing the electrode body between the edge on the first opening side and a position a specific distance away from the edge on the first opening side along the axial direction toward the second opening side. "Axial direction" refers to the direction from the first opening of the metal cylinder toward the second opening of the metal cylinder. "Specific distance" refers to a length of 10% of the total length in the axial direction of the portion of the resin body facing the electrode body. "The portion of the resin body on the second opening side" refers to the portion of the resin electrode body facing the electrode body between the edge on the second opening side and a position a specific distance away from the edge on the second opening side along the axial direction toward the first opening side.

[0013] In the second embodiment, the first proportion is higher than the second proportion. In other words, heat from the second opening side of the electrode body is more easily transferred to the metal cylinder than heat from the first opening side of the electrode body. As a result, the battery in the second embodiment has superior cooling performance for the second opening side of the electrode body.

[0014] <3> A battery according to a third aspect of this disclosure is The plurality of recessed portions include tapered recessed portions that narrow in width from the first opening to the second opening, <1> or <2> This is the battery described in [the document].

[0015] In the third embodiment, the multiple recessed portions include tapered recessed portions. In other words, heat from the portion of the electrode body on the second opening side is more easily transferred to the metal cylinder than heat from the portion of the electrode body on the first opening side. As a result, the battery in the third embodiment has superior cooling performance for the portion of the electrode body on the second opening side.

[0016] <4> A battery according to a fourth aspect of this disclosure is The electrode body, A plurality of negative electrode current collector tabs are electrically connected to the negative electrode current collector and extend toward the first opening side, A plurality of positive electrode current collector tabs are electrically connected to the positive electrode current collector and extend toward the second opening side, It further possesses, The battery according to any one of <1> to <3>, wherein the number of the negative electrode current collecting tabs is larger than the number of the positive electrode current collecting tabs.

[0017] Due to the use of the battery, the positive electrode current collecting tab may generate heat more easily than the negative electrode current collecting tab. In the fourth aspect, the number of the negative electrode current collecting tabs extending to the first opening side is larger than the number of the positive electrode current collecting tabs extending to the second opening side. That is, in the fourth aspect, the positive electrode current collecting tab that easily generates heat is disposed on the second opening side where heat transfer is easy, and the negative electrode current collecting tab that hardly generates heat is disposed on the first opening side where heat transfer is difficult. As a result, the battery of the fourth aspect is a battery with a smaller temperature difference in use inside the electrode body.

[0018] <5>The battery of the fifth aspect of the present disclosure is the battery according to any one of <1> to <4>, wherein the metal cylindrical body has a plurality of convex portions that contact the resin body on its inner surface.

[0019] Thereby, in the fifth aspect, the resin body is more easily fixed to the metal cylindrical body than in the configuration where the metal cylindrical body does not have a plurality of convex portions. As a result, in the battery of the fifth aspect, the electrode body is restrained by the metal cylindrical body.

[0020] <6>The battery of the sixth aspect of the present disclosure is the resin body includes a resin sheet having the plurality of recessed portions, the battery according to <5>, wherein the height of the convex portion is 3 / 4 or less of the thickness of the resin sheet and 10 μm or more.

[0021] Thereby, in the sixth aspect, the resin body is more easily fixed by the metal cylindrical body than in the configuration where the height of the convex portion is not 3 / 4 or less of the thickness of the resin sheet and not 10 μm or more. As a result, in the battery of the sixth aspect, the electrode body is more firmly restrained by the metal cylindrical body.

[0022] <7>The method for manufacturing a battery of the present disclosure is a method for manufacturing a battery for manufacturing the battery according to <4>, the resin body includes a resin sheet having the plurality of recessed portions, The method for manufacturing the aforementioned battery is, To prepare an electrode body with a resin sheet, which has the electrode body and a resin sheet attached to the electrode body, Insert the electrode body with the resin sheet into the first opening of the metal cylinder from the positive electrode current collector tab side, and position the electrode body with the resin sheet inside the metal cylinder. This is a method for manufacturing batteries, including [the specified component].

[0023] The battery manufacturing method of the seventh embodiment can efficiently manufacture the battery of the fourth embodiment. [Effects of the Invention]

[0024] According to this disclosure, a battery in which the electrode body and the case are electrically insulated, and in which the operating temperature difference within the electrode body is small, and a method for manufacturing the battery are provided. [Brief explanation of the drawing]

[0025] [Figure 1] Figure 1 is a perspective view of the battery according to the first embodiment. [Figure 2] Figure 2 is a cross-sectional view of the battery according to the first embodiment, shown along line II-II in Figure 1. [Figure 3] Figure 3 is a cross-sectional view of the battery according to the first embodiment shown by line III-III in Figure 1. [Figure 4] Figure 4 is a cross-sectional view of the battery of the first embodiment of the IV-IV line shown in Figure 1. [Figure 5] Figure 5 is a perspective view of the external appearance of the electrode body with a resin sheet according to the first embodiment. [Figure 6] Figure 6 is a cross-sectional view of the electrode body of the first embodiment along line II-II in Figure 1. [Figure 7] Figure 7 is a cross-sectional view of the electrode body of the first embodiment shown by line III-III in Figure 1. [Figure 8] Figure 8 is an external perspective view of the electrode body with a resin sheet according to the second embodiment. [Modes for carrying out the invention]

[0026] In this disclosure, a numerical range indicated using "~" means a range that includes the numbers before and after "~" as the minimum and maximum values, respectively. In numerical ranges described in stages in this disclosure, the upper or lower limit stated in one numerical range may be replaced by the upper or lower limit of another numerical range described in stages. In this disclosure, a combination of two or more preferred embodiments is a more preferred embodiment. In this disclosure, the term "process" is included not only in the sense of an independent process, but also in the sense of a process that is not clearly distinguishable from other processes, as long as its intended purpose is achieved.

[0027] Embodiments of the battery of this disclosure will be described below with reference to the drawings. In the drawings, the same or corresponding parts will be denoted by the same reference numerals and will not be repeated in the description.

[0028] (1) First Embodiment (1.1)Battery The battery 1A of the first embodiment is a solid-state battery. As shown in Figure 1, the battery 1A comprises an electrode body 10, a case 20, a resin body 30A (see Figure 2), a negative electrode terminal 41 (see Figure 2), and a positive electrode terminal 42 (see Figure 2). The electrode body 10 is a rectangular parallelepiped.

[0029] In the first embodiment, the longitudinal direction of the first main surface S11A of the electrode body 10 is defined as the X-axis direction. The short direction of the first main surface S11A of the electrode body 10 is defined as the Y-axis direction. The thickness direction of the electrode body 10 is defined as the Z-axis direction. The X-axis, Y-axis, and Z-axis are all orthogonal to each other. The X-axis direction is just one example of an axial direction. These directions do not limit the orientation of the battery when it is used.

[0030] The negative terminal 41, the electrode body 10, and the positive terminal 42 are arranged in this order along the positive X-axis direction. Each of the negative terminal 41 and the positive terminal 42 is electrically connected to the electrode body 10. The resin body 30A is interposed between the electrode body 10 and the case 20. The electrode body 10 and the resin body 30A are sealed by the case 20, the negative terminal 41, and the positive terminal 42.

[0031] (1.1.1) Electrode body The electrode body 10 functions as a power generation element for the battery 1A.

[0032] As shown in Figure 2, the electrode body 10 includes an electrode body 11, a plurality of negative electrode current collector tabs 12, and a plurality of positive electrode current collector tabs 13. The plurality of negative electrode current collector tabs 12 and the plurality of positive electrode current collector tabs 13 are electrically connected to the electrode body 11.

[0033] The electrode body 11 is a rectangular parallelepiped. As shown in Figures 3 and 4, the electrode body 11 has a first main surface S11A, a second main surface S11B, a first side surface S11C, a second side surface S11D, a third side surface S11E (see Figure 2), and a fourth side surface S11F (see Figure 2). The first main surface S11A faces the second main surface S11B in the Z-axis direction. The first side surface S11C faces the second side surface S11D in the Y-axis direction. The third side surface S11E faces the fourth side surface S11F in the X-axis direction. The first main surface S11A is continuously connected to the first side surface S11C, the second side surface S11D, the third side surface S11E, and the fourth side surface S11F. The second main surface S11B is continuously connected to the first side surface S11C, the second side surface S11D, the third side surface S11E, and the fourth side surface S11F.

[0034] Details of the electrode body 10 will be described later.

[0035] (1.1.2) Case Case 20 houses the electrode body 10.

[0036] Case 20, as shown in Figure 2, comprises a metal cylinder 21, a pair of lids 22, and an electrical insulator 23. The metal cylinder 21 has a first opening R21A and a second opening R21B. One of the pair of lids 22 closes the first opening R21A of the metal cylinder 21. The other of the pair of lids 22 closes the second opening R21B of the metal cylinder 21. The pair of lids 22 are welded to the metal cylinder 21. The electrical insulator 23 is interposed between each of the negative terminal 41 and positive terminal 42 and the lids 22.

[0037] (1.1.2.1) Metal cylinder In the first embodiment, the metal cylinder 21 is a rectangular tube, as shown in Figures 3 and 4. The metal cylinder 21 has a hollow section, which extends along the X-axis. The first opening R21A communicates with the second opening R21B through the hollow section. The first opening R21A faces the second opening R21B in the X-axis direction. The first opening R21A is located in the negative X-axis direction relative to the second opening R21B. The metal cylinder 21 has a first wall portion 211, a second wall portion 212, a third wall portion 213, and a fourth wall portion 214. The first wall portion 211 faces the first main surface S11A of the electrode body 11. The second wall portion 212 faces the second main surface S11B of the electrode body 11. The third wall portion 213 faces the first side surface S11C of the electrode body 11. The fourth wall portion 214 faces the second side surface S11D of the electrode body 11. The first wall portion 211 is continuously connected to the third wall portion 213 and the fourth wall portion 214. The second wall portion 212 is continuously connected to the third wall portion 213 and the fourth wall portion 214.

[0038] In the first embodiment, the inner surface S212 of the second wall portion 212 of the metal cylindrical body 21 has a plurality of protrusions C21 that come into contact with the resin body 30A. The plurality of protrusions C21 may be arranged regularly or irregularly.

[0039] In the first embodiment, the height L1 of the protrusion C21 (length of the protrusion C21 in the Z-axis direction) (see Figure 3) is not particularly limited, but is preferably 3 / 4 or less of the thickness L2 of the resin sheet 31A (see Figure 3) and 10 μm or more. The height L1 of the protrusion C21 may be 3 / 4 or more of the thickness L2 of the resin sheet 31A. The height L1 of the protrusion C21 may be 10 μm or less. The surface roughness (Ra) of the inner surface S212 of the second wall portion 212 may be 10 μm to 50 μm. The thickness L2 of the resin sheet 31A may be 10 μm to 300 μm.

[0040] In the first embodiment, the inner surface S211 of the first wall portion 211, the inner surface S213 of the third wall portion 213, and the inner surface S214 of the fourth wall portion 214 of the metal cylinder 21 are all flat surfaces. In other words, the inner surfaces S211, S213, and S214 do not have any protrusions C21.

[0041] The material of the metal cylinder is metal (for example, aluminum, copper, stainless steel (SUS), or nickel).

[0042] (1.1.2.2) Lid The cover 22 is a plate-like object. As shown in Figure 2, the cover 22 has one through-hole R22 extending in the X-axis direction. The negative terminal 41 is exposed from one through-hole R22 of the pair of covers 22. The positive terminal 42 is exposed from the other through-hole R22 of the pair of covers 22. The material of the cover is metal (for example, aluminum, copper, stainless steel (SUS), or nickel, etc.).

[0043] (1.1.2.3) Electrical insulators The electrical insulator 23 prevents electrical contact between the negative terminal 41 and the positive terminal 42 and the cover 22. The shape of the electrical insulator 23 is not particularly limited as long as it is interposed between the negative terminal 41 and the positive terminal 42 and the cover 22. The material of the electrical insulator may be a known resin (thermoplastic resin, thermosetting resin, etc.). The thermoplastic resin may be an elastomer.

[0044] (1.1.3) Resin body The resin body 30A electrically insulates the electrode body 10 from the case 20.

[0045] The resin body 30A comprises a pair of resin sheets 31A and a pair of resin fillers 32. One of the pair of resin sheets 31A is placed on the first main surface S11A of the electrode body 11, as shown in Figure 2. The other of the pair of resin sheets 31A is placed on the second main surface S11A of the electrode body 11. One of the pair of resin fillers 32 is placed on the first side surface S11C of the electrode body 11, as shown in Figure 3. The other of the pair of resin fillers 32 is placed on the second side surface S11D of the electrode body 11. The resin sheets 31A and the resin fillers 32 may or may not be welded together.

[0046] (1.1.3.1) Resin sheet The resin sheet 31A prevents electrical contact between the electrode body 10 and the case 20. The pair of resin sheets 31A cover the entire first main surface S11A and the second main surface S11B of the electrode body 11.

[0047] The resin sheet 31A is a sheet-like material. As shown in Figure 5, the resin sheet 31A has a plurality of recessed portions DA on the surface S31 that is in physical contact with the metal cylinder 21. The plurality of recessed portions DA extend from the first opening R21A of the metal cylinder 21 toward the second opening R21B of the metal cylinder 21 (i.e., in the positive X-axis direction). The plurality of recessed portions DA are not in physical contact with the metal cylinder 21.

[0048] The parts of the resin sheet 31A that are not recessed areas DA are flat areas. At least a portion of the flat areas of the resin sheet 31A are in physical contact with the metal cylinder 21.

[0049] In the first embodiment, the multiple recessed portions DA include two tapered recessed portions DA1 and six tapered recessed portions DA2. The tapered recessed portions DA1 and DA2 have a width L3 (see Figures 3 to 5) that narrows from the first opening R21A of the metal cylinder 21 toward the second opening R21B of the metal cylinder 21 (i.e., in the positive X-axis direction). That is, the width L3 of the recessed portion DA on the negative terminal 41 side is wider than the width L3 of the recessed portion DA on the positive terminal 42 side.

[0050] The length of the tapered recess DA1 in the X-axis direction is longer than the length of the tapered recess DA2 in the X-axis direction. The two large recesses DA1 and the six small recesses DA2 are formed regularly at predetermined intervals in the Y-axis direction.

[0051] In the first embodiment, the first ratio is higher than the second ratio. The "first ratio" represents the ratio of the total area of ​​multiple recessed areas DA in part R31A (see Figure 5) to the area of ​​part R31A (see Figure 5) on the side of the first opening R21A of the resin sheet 31A. The "second ratio" represents the ratio of the total area of ​​multiple recessed areas DB in part R31B (see Figure 5) to the area of ​​part R31B (see Figure 5) on the side of the second opening R21B of the resin sheet 31A. Part R31A represents the part of the resin sheet 31A facing the electrode body 11, between the edge E31A1 on the side of the first opening R21A and a position E31A2 located a specific distance L4 (see Figure 5) away from the edge E31A1 along the positive X-axis toward the second opening R21B. "Part R31B" refers to the portion of the resin sheet 31A facing the electrode body 11, specifically the area between the edge E31B1 on the second opening R21A side and position E31B2, which is located a specific distance L4 (see Figure 5) away from the edge E31B1 along the negative X-axis towards the first opening R21A side. The specific distance L4 represents 10% of the total length L5 (see Figure 5) in the X-axis direction of the portion of the resin sheet 31A facing the electrode body 11.

[0052] The material of the resin sheet includes known resins (thermoplastic resins, thermosetting resins, etc.). The thermoplastic resin may be an elastomer. The resin sheet may further contain a thermally conductive filler as needed. The material of the thermally conductive filler is not particularly limited and includes metal oxides (e.g., alumina, silica, or magnesia), metal nitrides (e.g., aluminum nitride, silicon nitride, or boron nitride), artificial diamond, or silicon carbide. The resin sheet may further contain compounding agents as needed. Examples of compounding agents include fillers such as glass fibers, carbon fibers, and inorganic powders, heat stabilizers, antioxidants, pigments, weathering agents, flame retardants, plasticizers, dispersants, lubricants, mold release agents, or antistatic agents.

[0053] (1.1.3.2) Resin-filled body The resin filler 32 prevents electrical contact between the electrode body 10 and the case 20.

[0054] The resin filler 32 is filled between the first side surface S11C of the electrode body 11 and the inner surface S213 of the third wall portion 213 of the case 20. The resin filler 32 is filled between the second side surface S11D of the electrode body 11 and the inner surface S214 of the fourth wall portion 214 of the case 20.

[0055] The material of the resin filler may be the same as that exemplified for the material of the resin sheet 31A. The material of the resin filler may be the same as or different from the material of the resin sheet. As the content of the thermally conductive filler increases, thermal conductivity tends to improve, while electrical insulation tends to decrease. The thermal conductivity of the resin filler 32 may be higher than that of the resin sheet 31A, and the electrical insulation of the resin filler 32 may be lower than that of the resin sheet 31A.

[0056] (1.1.4) Negative terminal and positive terminal The negative terminal 41 and positive terminal 42 are used to discharge the electricity generated in the electrode body 10 to the outside of the battery 1A. The materials for the negative and positive terminals include metals (for example, aluminum, stainless steel (SUS), or nickel).

[0057] (1.1.5) Details of the electrode As shown in Figure 2, the electrode body 10 includes an electrode body 11, a plurality of negative electrode current collecting tabs 12, and a plurality of positive electrode current collecting tabs 13. The electrode body 11 includes a plurality of unit electrode bodies 11U, as shown in Figures 6 and 7. The plurality of unit electrode bodies 11U are stacked along the Z-axis direction. The plurality of unit electrode bodies 11U are connected in parallel.

[0058] The first side surface S11C, the second side surface S11D, and the third side surface S11E of the electrode body 11 are flat surfaces (i.e., planar) as shown in Figures 6 and 7. The fourth side surface S11F of the electrode body 11 is a tapered surface (i.e., stepped surface) as shown in Figure 6.

[0059] The stacked structure of the unit electrode body 11U is a monopolar type structure. Specifically, the unit electrode body 11U has two solid electrolyte layers 111, two negative electrode active material layers 112, two positive electrode active material layers 113, two negative electrode current collectors 114, and one positive electrode current collector 115. The negative electrode current collector 114, negative electrode active material layer 112, solid electrolyte layer 111, positive electrode active material layer 113, positive electrode current collector 115, positive electrode active material layer 113, solid electrolyte layer 111, negative electrode active material layer 112, and negative electrode current collector 114 are stacked in this order along the Z-axis direction.

[0060] One negative electrode current collector tab 12 is connected to one negative electrode current collector 114. One positive electrode current collector tab 13 is connected to one positive electrode current collector 115. The number of negative electrode current collector tabs 12 on the electrode body 10 is greater than the number of positive electrode current collector tabs 13 on the electrode body 10.

[0061] (1.1.5.1) Solid electrolyte layer The solid electrolyte layer 111 contains a solid electrolyte. The solid electrolyte is not particularly limited and may be an aggregate of multiple particles. Preferably, the solid electrolyte contains one selected from the group consisting of sulfide solid electrolytes, oxide solid electrolytes, and halide solid electrolytes. The solid electrolyte may be a known solid electrolyte.

[0062] The solid electrolyte layer may further contain a binder. The binder may be used for bonding between solid electrolytes. The binder may be used for bonding the solid electrolyte to the negative electrode active material layer 112 or the positive electrode active material layer 113. Examples of binders include vinyl halogenated resins (e.g., polyvinylidene fluoride (PVdF), etc.), rubbers (e.g., acrylate butadiene rubber (ABR), or styrene-butadiene rubber (SBR), etc.), or polyolefin resins (e.g., polyethylene (PE), or polypropylene (PP), etc.).

[0063] (1.1.5.2) Negative electrode active material layer The negative electrode active material layer 112 contains a negative electrode active material. The negative electrode active material layer 112 may optionally contain at least one of a negative electrode solid electrolyte, a conductive additive, and a binder.

[0064] Examples of negative electrode active materials include Li-based active materials (e.g., metallic lithium), carbon-based active materials (e.g., graphite), oxide-based active materials (e.g., lithium titanate), or Si-based active materials (e.g., elemental Si).

[0065] Examples of solid electrolytes for the negative electrode include those similar to those exemplified as solid electrolytes contained in the solid electrolyte layer.

[0066] Examples of conductive additives that can be used in the negative electrode active material layer include carbon materials (e.g., carbon black, carbon nanotubes, graphite, or carbon fluoride), metallic materials (e.g., aluminum powder, or conductive whiskers), or conductive polymer materials (e.g., polyaniline, polypyrrole, or polythiophene).

[0067] Binders that can be used in the negative electrode active material layer are similar to those exemplified as binders included in the solid electrolyte layer.

[0068] (1.1.5.3) Positive electrode active material layer The positive electrode active material layer 113 contains a positive electrode active material. The positive electrode active material layer 113 may optionally contain at least one of a positive electrode solid electrolyte, a conductive additive, and a binder.

[0069] The positive electrode active material preferably contains a lithium composite oxide. The lithium composite oxide may contain at least one element selected from the group consisting of F, Cl, N, S, Br, and I. The lithium composite oxide may also have a crystal structure belonging to at least one space group selected from the space groups R-3m, Immm, and P63-mmc. Furthermore, the lithium composite oxide may have an O2-type structure in which the main arrangement of the transition metal, oxygen, and lithium is located. The positive electrode active material may be a known positive electrode active material.

[0070] Examples of solid electrolytes for the positive electrode include those similar to those exemplified as solid electrolytes for the negative electrode that can be used in the negative electrode active material layer.

[0071] Examples of conductive additives include those similar to those exemplified as conductive additives that can be used in the negative electrode active material layer.

[0072] Examples of binders include those similar to those exemplified as binders that can be used in the negative electrode active material layer.

[0073] (1.1.5.4) Negative electrode current collector The negative electrode current collector 114 collects current from the negative electrode active material layer 112. The material of the negative electrode current collector is not particularly limited and includes, for example, stainless steel, aluminum, copper, nickel, iron, titanium, or carbon. The negative electrode current collector may be copper foil. The shape of the negative electrode current collector may be, for example, foil-like or mesh-like. The negative electrode current collector may have a buffer layer, an elastic layer, or a PTC (Positive Temperature Coefficient) thermistor layer on its surface.

[0074] (1.1.5.5) Positive electrode current collector The positive electrode current collector 115 collects current from the positive electrode active material layer 113. The material of the positive electrode current collector is not particularly limited and includes, for example, stainless steel, aluminum, copper, nickel, iron, titanium, or carbon. The positive electrode current collector may be an aluminum alloy foil or an aluminum foil. The aluminum alloy foil and aluminum foil may be manufactured using powder. The shape of the positive electrode current collector may be, for example, foil-like or mesh-like. The positive electrode current collector may have a buffer layer, an elastic layer, or a PTC (Positive Temperature Coefficient) thermistor layer on its surface.

[0075] (1.1.5.6) Negative current collection tab The negative electrode current collector tab 12 electrically connects the negative electrode current collector body 114 and the negative electrode terminal 41. The negative electrode current collector tab 12 is connected to the negative electrode current collector body 114. As shown in Figure 2, the negative electrode current collector tab 12 protrudes in the negative X-axis direction relative to the third side surface S11E of the electrode body 11. Specifically, in the first embodiment, a bundle including a plurality of negative electrode current collector tabs 12 is electrically connected to the negative electrode terminal 41. It is preferable that the negative electrode current collector tab 12 is formed continuously from the negative electrode current collector body 114. The material of the negative electrode current collector tab is not particularly limited and may be metal (for example, aluminum, stainless steel (SUS), or nickel, etc.).

[0076] (1.1.5.7) Positive current collection tab The positive electrode current collector tab 13 electrically connects the positive electrode current collector body 115 and the positive electrode terminal 42. The positive electrode current collector tab 13 is connected to the positive electrode current collector body 115. As shown in Figure 2, the positive electrode current collector tab 13 protrudes in the positive X-axis direction relative to the fourth side surface S11F of the electrode body 11. Specifically, in the first embodiment, a bundle including a plurality of positive electrode current collector tabs 13 is electrically connected to the positive electrode terminal 42. It is preferable that the positive electrode current collector tab 13 is formed continuously from the positive electrode current collector body 115. The material of the positive electrode current collector tab is not particularly limited and may be metal (for example, aluminum, stainless steel (SUS), or nickel, etc.).

[0077] (1.1.6) Purpose Applications for the 1A battery include powering electrical equipment (e.g., vehicles, electronic devices, or electrical storage). Vehicles include electric four-wheeled vehicles, electric two-wheeled vehicles, gasoline cars, and diesel cars. Electric four-wheeled vehicles include electric vehicles (BEVs), plug-in hybrid vehicles (PHEVs), and hybrid vehicles (BEVs). Electric two-wheeled vehicles include electric motorcycles and electric-assist bicycles. Electronic devices include handheld devices (e.g., smartphones, tablet computers, or audio players), portable devices (e.g., notebook computers, or CD (Compact Disc) players), and mobile devices (e.g., power tools, or professional video cameras). In particular, the 1A battery is preferably used as a power source for hybrid vehicles, plug-in hybrid vehicles, or electric vehicles.

[0078] (1.2) Method of manufacturing a battery The battery manufacturing method of the first embodiment is a method for manufacturing battery 1A. This method includes a preparation step (A), an insertion step, a resin filling step, a terminal connection step, and a sealing step. The preparation step (A), the insertion step, the resin filling step, the terminal connection step, and the sealing step may be performed in this order.

[0079] (1.2.1) Preparation process (A) In preparation step (A), an electrode body with a resin sheet is prepared. The electrode body with a resin sheet has an electrode body 10 and a pair of resin sheets 31A attached to the electrode body 10. The electrode body with a resin sheet does not have a resin filler 32.

[0080] The preparation method for an electrode body with a resin sheet includes an electrode body sheet preparation step, a cutting step, a current collection tab connection step, a lamination step, a resin sheet preparation step (A), and an installation step. The unit electrode body sheet preparation step, cutting step, current collection tab connection step, lamination step, and installation step are performed in this order. The resin sheet preparation step (A) is performed before the installation step.

[0081] (1.2.1.1) Preparation process for the main body sheet of the unit electrode In the unit electrode body sheet preparation process, the unit electrode body sheet is prepared. The unit electrode body sheet is the same as the unit electrode body 11U except for its size. Specifically, the unit electrode body sheet is made up of a negative electrode current collector sheet, a negative electrode active material layer sheet, a solid electrolyte layer sheet, a positive electrode active material layer sheet, a positive electrode current collector sheet, a positive electrode active material layer sheet, a solid electrolyte layer sheet, a negative electrode active material layer sheet, and a negative electrode current collector sheet, all stacked in this order along the Z-axis direction. When the unit electrode body sheet is viewed from the Z-axis direction, the area of ​​the negative electrode current collector sheet, the area of ​​the negative electrode active material layer sheet, the area of ​​the solid electrolyte layer sheet, the area of ​​the positive electrode active material layer sheet, and the area of ​​the positive electrode current collector sheet are in this order from largest to smallest. The area of ​​the positive electrode current collector sheet is the largest.

[0082] The method for preparing the unit electrode body sheet can be any known method.

[0083] (1.2.1.2) Cutting process In the cutting process, three sides of the unit electrode body sheet are cut. This yields the unit electrode body 11U. The cut surfaces of the unit electrode body 11U are surfaces without steps (i.e., the first side surface S11C, the second side surface S11D, and the third side surface S11E). The uncut surface of the unit electrode body 11U is a surface with a tapered step (i.e., the fourth side surface S11F).

[0084] The cutting method may be any known method. Shearing tools (e.g., scissors or round blades) may be used for the cutting method.

[0085] (1.2.1.3) Connection process In the connection process, the negative electrode current collector tab 12 is connected to the negative electrode current collector 114 of the unit electrode body 11U, and the positive electrode current collector tab 13 is connected to the positive electrode current collector 115 of the unit electrode body 11U. This results in a unit electrode body 11U with the negative electrode current collector tab 12 and the positive electrode current collector tab 13 connected (hereinafter also referred to as the "unit electrode body with current collector tabs").

[0086] The method of connecting the negative electrode current collector tab 12 and the positive electrode current collector tab 13 can be any known method.

[0087] (1.2.1.4) Lamination process In the lamination process, multiple unit electrode bodies with current-collecting tabs are stacked in this order along the Z-axis. This yields the electrode body 10.

[0088] The lamination method is not particularly limited and any known method is acceptable.

[0089] (1.2.1.5) Resin sheet preparation process (A) In the resin sheet preparation process (A), the resin sheet 31A is prepared.

[0090] The method for preparing the resin sheet 31A is not particularly limited and includes, for example, a method of forming multiple recessed areas DA on a resin sheet with flat surfaces on both sides, or injection molding. Methods for forming multiple recessed areas DA on a resin sheet with flat surfaces on both sides include cutting, grooving or drilling by laser processing, or punching by a die.

[0091] (1.2.1.6) Installation process In the mounting process, resin sheets 31A are attached to the first main surface S11A and the second main surface S11B of the electrode body 10. This results in an electrode body with resin sheets.

[0092] The method of attaching the resin sheet 31A is not particularly limited and any known method is acceptable.

[0093] (1.2.2) Insertion process In the insertion process, the electrode body with the resin sheet is inserted into the first opening R21A of the metal cylinder 21 from the positive electrode current collector tab 13 side, and the electrode body with the resin sheet is positioned inside the metal cylinder 21. This yields the first unfinished battery.

[0094] The method for inserting the resin-attached electrode body is not particularly limited and any known method is acceptable.

[0095] (1.2.3) Resin filling process In the resin filling process, the unsolidified resin filler 32 is filled into the gap between the electrode body 11 and the metal cylinder 21 of the first unfinished battery, thereby forming the resin filler 32. Specifically, the unsolidified resin filler 32 is filled into the gap between the first side surface S11C of the electrode body 11 and the inner surface S213 of the third wall portion 213 of the metal cylinder 21, and into the gap between the second side surface S11D of the electrode body 11 and the inner surface S214 of the fourth wall portion 214 of the case 20. This results in the second unfinished battery.

[0096] The method for filling the resin filler 32 is not particularly limited and any known method is acceptable. The method for solidifying the unsolidified material in the resin filler 32 is appropriately selected depending on the type of resin.

[0097] (1.2.4) Terminal connection process In the terminal connection step, multiple negative electrode current collector tabs 12 of the second incomplete battery are connected to the negative electrode terminal 41, and multiple positive electrode current collector tabs 13 are connected to the positive electrode terminal 42. Specifically, in the first embodiment, a first bundle including multiple negative electrode current collector tabs 12 is formed, and the first bundle is electrically connected to the negative electrode terminal 41. Similarly, a second bundle including multiple positive electrode current collector tabs 13 is formed, and the second bundle is electrically connected to the positive electrode terminal 42. This gives rise to the third incomplete battery.

[0098] The connection method is not particularly limited; any publicly known method is acceptable.

[0099] (1.2.5) Sealing process In the sealing process, the electrode body 10 is sealed by attaching the lid 22 and the electrical insulator 23 to the first opening R21A and the second opening R21B of the metal cylinder 21 of the third unfinished battery. This results in a battery 1A.

[0100] The sealing method is not particularly limited and any known method is acceptable.

[0101] (1.3) Effects As explained with reference to Figures 1 to 7, the battery 1A comprises an electrode body 10, a case 20, and a resin body 30A. The case 20 has a metal cylindrical body 21 and a lid 22. The resin body 30A has a plurality of recessed portions DA. As a result, multiple recessed areas DA are formed in the resin sheet 31A near multiple negative electrode current collector tabs 12. The negative electrode current collector tabs 12 may generate less heat than the positive electrode current collector tabs 13 when using the battery 1A. Consequently, the battery 1A is a battery in which the electrode body 10 and the case 20 are electrically insulated, and the operating temperature difference within the electrode body 10 is small.

[0102] As explained with reference to Figures 1 to 7, the first proportion of battery 1A is higher than the second proportion. In other words, heat from the part R31B on the side of the second opening R21B of the electrode body 10 is more easily transferred to the metal cylindrical body 21 than heat from the part R31A on the side of the first opening R21A of the electrode body 10. As a result, the battery 1A has superior cooling performance for the part of the electrode body 10 on the side of the second opening R21B.

[0103] As explained with reference to Figures 1 to 7, the multiple recessed areas DA include tapered recessed areas DA1 and DA2. In other words, heat from the part of the electrode body 10 on the side of the second opening R21B is more easily transferred to the metal cylinder 21 than heat from the part of the electrode body 10 on the side of the first opening R21A. As a result, the battery 1A has superior cooling performance for the part of the electrode body 10 on the side of the second opening R21B.

[0104] As explained with reference to Figures 1 to 7, the electrode body 10 further comprises a plurality of negative electrode current collecting tabs 12 and a plurality of positive electrode current collecting tabs 13. The number of negative electrode current collecting tabs 12 is greater than the number of positive electrode current collecting tabs 13. With the use of a 1A battery, the positive electrode current collector tab 13 may generate more heat than the negative electrode current collector tab 12. In a 1A battery, the positive electrode current collector tab 13, which generates more heat, is positioned on the side of the second opening R21B, which conducts heat more easily, while the negative electrode current collector tab 12, which generates less heat, is positioned on the side of the first opening R21A, which conducts heat less easily. As a result, a 1A battery has a smaller operating temperature difference within the electrode body 10.

[0105] As explained with reference to Figures 1 to 7, the metal cylinder 21 has a plurality of protrusions C21 on its inner surface S212. As a result, the resin body 30A is more easily fixed to the metal cylinder 21 than in a configuration where the metal cylinder 21 does not have multiple protrusions C21. Consequently, in battery 1A, the electrode body 10 is constrained to the metal cylinder 21.

[0106] As explained with reference to Figures 1 to 7, the resin body 30A includes a resin sheet 31A. The height L1 of the protrusion C21 is preferably 3 / 4 or less of the thickness L2 of the resin sheet 31A and 10 μm or more. As a result, the resin body 30A is more easily fixed by the metal cylinder 21 than in a configuration where the height L1 of the protrusion C21 is 3 / 4 or less of the thickness L2 of the resin sheet 31A and not 10 μm or more. Consequently, in the battery 1A, the electrode body 10 is firmly restrained by the metal cylinder 21.

[0107] As explained with reference to Figures 1 to 7, the battery manufacturing method of the first embodiment is a method for manufacturing battery 1A. The resin body 30A includes a resin sheet 31A. The method includes a preparation step (A) and an insertion step. The battery manufacturing method of the first embodiment can efficiently manufacture a battery 1A.

[0108] (2) Second Embodiment (2.1)Battery The battery 1B according to the second embodiment is the same as the battery 1A according to the first embodiment, except that a plurality of recessed areas are formed irregularly.

[0109] Battery 1B comprises an electrode body 10, a case 20, a resin body 30B, a negative terminal 41, and a positive terminal 42.

[0110] The resin body 30B comprises a pair of resin sheets 31B and a pair of resin fillers 32. The resin sheet 31B is the same as the resin sheet 31A, except that it has a plurality of irregularly formed recessed areas.

[0111] The resin sheet 31B is a sheet-like material. As shown in Figure 8, the resin sheet 31B has a plurality of recessed portions DB on the surface S31 that is in physical contact with the metal cylinder 21. The plurality of recessed portions DB extend from the first opening R21A of the metal cylinder 21 toward the second opening R21B of the metal cylinder 21 (i.e., in the positive X-axis direction). The plurality of recessed portions DB do not physically contact the metal cylinder 21.

[0112] The parts of the resin sheet 31B that are not recessed areas DB are flat areas. The flat areas of the resin sheet 31B are in physical contact with the metal cylinder 21.

[0113] In the second embodiment, the multiple recessed portions DB include tapered recessed portions DB1 to DB3 and DB7, broad recessed portions DB4 and DB5, and a constant-width recessed portion DB6. The tapered recessed portions DB1 to DB3 and DB7 have a width L3 that narrows in the positive X-axis direction. The broad recessed portions DB4 and DB5 have a width L3 that widens in the positive X-axis direction. The constant-width recessed portion DB6 has a width L3 that is constant in the positive X-axis direction.

[0114] The length of each of the multiple recessed areas DB in the X-axis direction is different. The lengths of each of the multiple recessed areas DB in the X-axis direction are formed regularly along the Y-axis direction.

[0115] In the second embodiment, the first ratio is higher than the second ratio. The "first ratio" represents the ratio of the total area of ​​multiple recessed areas DB in part R31A to the area of ​​part R31A on the first opening R21A side of the resin sheet 31B. The "second ratio" represents the ratio of the total area of ​​multiple recessed areas DB in part R31B to the area of ​​part R31B on the second opening R21B side of the resin sheet 31B. Part R31A represents the part of the resin sheet 31B facing the electrode body 11 between the edge E31A1 on the first opening R21A side and a position E31A2 located a specific distance L4 (see Figure 8) away from the edge E31A1 along the positive X-axis toward the second opening R21B side. "Part R31B" refers to the portion of the resin sheet 31B facing the electrode body 11, specifically the area between the edge E31B1 on the second opening R21A side and position E31B2, which is located a specific distance L4 (see Figure 8) away from the edge E31B1 along the negative X-axis towards the first opening R21A side. The specific distance L4 represents 10% of the total length L5 (see Figure 8) in the X-axis direction of the portion of the resin sheet 31B facing the electrode body 11.

[0116] (2.2) Method of manufacturing a battery The second embodiment of the battery manufacturing method is a method for manufacturing battery 1B. This method includes a preparation step (B), an insertion step, a resin filling step, a terminal connection step, and a sealing step. The preparation step (B), the insertion step, the resin filling step, the terminal connection step, and the sealing step may be performed in this order.

[0117] (2.2.1) Preparation process (B) In preparation step (B), an electrode body with a flat resin sheet is prepared. The electrode body with a flat resin sheet comprises an electrode body 10 and a pair of flat resin sheets attached to the electrode body 10. The flat resin sheets are the same as the resin sheet 31B except that they do not have a plurality of recessed portions DB. The electrode body with a flat resin sheet does not have a resin filler 32.

[0118] The preparation method for an electrode body with a flat resin sheet includes an electrode body sheet preparation step, a cutting step, a current collection tab connection step, a lamination step, a resin sheet preparation step (B), and an attachment step. The preparation method for an electrode body with a flat resin sheet is the same as the preparation method for an electrode body with a resin sheet of the first embodiment, except that resin sheet preparation step (A) is changed to resin sheet preparation step (B).

[0119] (2.2.1.1) Resin sheet preparation process (B) In resin sheet preparation step (B), a flat resin sheet is prepared.

[0120] Any known method can be used to prepare the flat resin sheet.

[0121] (2.2.2) Insertion process In the insertion process, the electrode body with the flat resin sheet is inserted into the first opening R21A of the metal cylinder 21 from the positive electrode current collector tab 13 side, and the electrode body with the flat resin sheet is positioned inside the metal cylinder 21. In the second embodiment, when the electrode body with the flat resin sheet is inserted into the metal cylinder 21, the flat resin sheet and the metal cylinder 21 come into physical contact. As a result, multiple recessed areas DB are formed in the flat resin sheet. As a result, the first incomplete battery is obtained.

[0122] The method for inserting the resin-attached electrode body is not particularly limited and any known method is acceptable.

[0123] (2.2.3) Resin filling process The resin filling process in the second embodiment is carried out in the same manner as the resin filling process in the first embodiment.

[0124] (2.2.4) Terminal connection process The terminal connection process in the second embodiment is carried out in the same manner as the terminal connection process in the first embodiment.

[0125] (2.2.5) Sealing process The sealing process in the second embodiment is carried out in the same manner as the sealing process in the first embodiment.

[0126] (2.3) Effects Battery 1B is the same as battery 1A, except that the multiple recessed areas DA have been changed to multiple recessed areas DB. Therefore, battery 1B produces the same effects as battery 1A.

[0127] (3) Variant In the first and second embodiments, the first proportion is higher than the second proportion, but the disclosure is not limited thereto. The first proportion may be the same as the second proportion or lower than the second proportion.

[0128] In the first and second embodiments, the plurality of recessed portions DA and DB include tapered recessed portions DA1, DA2, DB1 to DB3, and DB7, but the disclosure is not limited thereto. The plurality of recessed portions do not necessarily include tapered recessed portions. The number, size, and shape of the recessed portions are not particularly limited and can be appropriately selected depending on the battery configuration, etc.

[0129] In the first and second embodiments, the number of negative electrode current collector tabs 12 is greater than the number of positive electrode current collector tabs 13, but the disclosure is not limited thereto. The number of negative electrode current collector tabs 12 may be the same as the number of positive electrode current collector tabs 13, or it may be less than the number of positive electrode current collector tabs 13.

[0130] In the first and second embodiments, the metal cylinder 21 has a plurality of protrusions C21 on its inner surface S212, but the disclosure is not limited thereto. The metal cylinder 21 does not have to have a plurality of protrusions C21. In addition to the inner surface S212, the metal cylinder 21 may further have a plurality of protrusions C21 on at least one of the inner surfaces S211, S213, and S214.

[0131] In the first and second embodiments, the height L1 of the protrusion C21 is preferably 3 / 4 or less of the thickness L2 of the resin sheet 31A and 10 μm or more, but the disclosure is not limited thereto. The height L1 of the protrusion C21 does not have to be 3 / 4 or less of the thickness L2 of the resin sheet 31A. The height L1 of the protrusion C21 does not have to be 10 μm or more.

[0132] In the first and second embodiments, batteries 1A and 1B have a solid electrolyte, but the disclosure is not limited thereto. The electrolyte may be a non-aqueous electrolyte containing a lithium salt (e.g., LiPF6), a non-aqueous gel electrolyte, or an ion-conducting polymer. If the electrolyte is not a solid electrolyte, the electrode structure may be a known structure depending on the type of electrolyte.

[0133] In the first and second embodiments, the resin bodies 30A and 30B have a pair of resin sheets 31A and 31B and a pair of resin fillers 32, but the disclosure is not limited thereto. The resin bodies may consist of resin sheets. If the resin bodies consist of resin sheets, the entire surface of the electrode body may be covered with resin sheets.

[0134] In the first and second embodiments, the size of the resin sheets 31A and 31B is larger than the size of the first main surface S11A and the second main surface S11B of the electrode body 11, respectively, but the disclosure is not limited thereto. The size of the resin sheets may be the same as the size of the first main surface S11A and the second main surface S11B of the electrode body 11. The portions of the resin sheets 31A and 31B that protrude from the first main surface S11A and the second main surface S11B may be curved to cover at least a portion of the third side surface S11E and the fourth side surface S11F of the electrode body 11.

[0135] In the first and second embodiments, the electrode body 10 includes a plurality of unit electrode bodies 11U, but the disclosure is not limited thereto. The electrode body 10 may consist of a single unit electrode body 11U.

[0136] In the first and second embodiments, the unit electrode body 11U is formed by stacking a negative electrode current collector 114, a negative electrode active material layer 112, a solid electrolyte layer 111, a positive electrode active material layer 113, a positive electrode current collector 115, a positive electrode active material layer 113, a solid electrolyte layer 111, a negative electrode active material layer 112, and a negative electrode current collector 114 in this order along the Z-axis direction, but the disclosure is not limited thereto. The unit electrode body 11U may also be formed by stacking a negative electrode current collector 114, a negative electrode active material layer 112, a solid electrolyte layer 111, a positive electrode active material layer 113, and a positive electrode current collector 115 in this order along the Z-axis direction. The unit electrode body 11U may consist of a positive electrode current collector 115, a positive electrode active material layer 113, a solid electrolyte layer 111, a negative electrode active material layer 112, a negative electrode current collector 114, a negative electrode active material layer 112, a solid electrolyte layer 111, a positive electrode active material layer 113, and a positive electrode current collector 115, all stacked in this order along the Z-axis direction.

[0137] In the first and second embodiments, the metal cylinder 21 is a rectangular metal container, but the disclosure is not limited thereto. The metal cylinder may be a cylindrical metal container.

[0138] In the first and second embodiments, the negative electrode current collector 114 and the negative electrode current collector tab 12 are separate components, and the positive electrode current collector 115 and the positive electrode current collector tab 13 are separate components, but the disclosure is not limited thereto. The negative electrode current collector 114 and the negative electrode current collector tab 12 may be the same component. The positive electrode current collector 115 and the positive electrode current collector tab 13 may be the same component.

[0139] In the first and second embodiments, the stacked configuration of the electrode body 11 is a configuration in which a plurality of unit electrode bodies 11U having a monopolar structure are connected in parallel, but the disclosure is not limited thereto. The stacked configuration of the electrode body may be a configuration in which a plurality of unit electrode bodies having a monopolar structure are connected in series (hereinafter also referred to as the "monopolar series configuration"). In the monopolar series configuration, the electrode body has a conductor that electrically connects the negative electrode current collector 114 and the positive electrode current collector 115, and does not have a bundle containing a plurality of negative electrode current collector tabs 12 or a plurality of positive electrode current collector tabs 13. The stacked configuration of the electrode body may be a configuration in which a plurality of unit electrode bodies having a bipolar structure are connected in series. [Explanation of symbols]

[0140] 1A, 1B: Battery, 10: Electrode body, 11: Electrode main body, 111: Solid electrolyte layer, 112: Negative electrode active material layer, 113: Positive electrode active material layer, 114: Negative electrode current collector, 115: Positive electrode current collector, 12: Negative electrode current collector tab, 13: Positive electrode current collector tab, 20: Case, 21: Metal cylinder, 22: Lid, 23: Electrical insulator, 30A, 30B: Resin body, 31A, 31B: Resin sheet, 32: Resin filler, 41: Negative electrode terminal, 42: Positive electrode terminal, DA, DB: Recessed area

Claims

1. An electrode body comprising a positive electrode current collector, a positive electrode active material layer, an electrolyte, a negative electrode active material layer, and a negative electrode current collector, A case for housing the electrode body, A resin body that electrically insulates the electrode body and the case, Equipped with, The case comprises a metal cylinder having a first opening and a second opening, and a lid that closes the first opening and the second opening, A battery in which the resin body has a plurality of recessed portions extending from the first opening toward the second opening.

2. The first percentage is higher than the second percentage. The first ratio represents the ratio of the total area of ​​the multiple recessed portions in the first opening portion of the resin body to the area of ​​the first opening portion, The battery according to claim 1, wherein the second ratio represents the ratio of the total area of ​​the plurality of recessed portions in the second opening portion of the resin body to the area of ​​the second opening portion.

3. The battery according to claim 1, wherein the plurality of recessed portions include tapered recessed portions that narrow in width from the first opening to the second opening.

4. The electrode body, A plurality of negative electrode current collector tabs are electrically connected to the negative electrode current collector and extend toward the first opening side, A plurality of positive electrode current collector tabs are electrically connected to the positive electrode current collector and extend toward the second opening side, It further possesses, The battery according to claim 1 or claim 2, wherein the number of negative electrode current collector tabs is greater than the number of positive electrode current collector tabs.

5. The battery according to claim 1, wherein the metal cylinder has a plurality of protrusions on its inner surface that come into contact with the resin body.

6. The resin body includes a resin sheet having the plurality of recessed portions, The battery according to claim 5, wherein the height of the protrusion is 3 / 4 or less of the thickness of the resin sheet and 10 μm or more.

7. A method for manufacturing a battery as described in claim 4, The resin body includes a resin sheet having the plurality of recessed portions, The method for manufacturing the aforementioned battery is, To prepare an electrode body with a resin sheet, which has the electrode body and a resin sheet attached to the electrode body, Insert the electrode body with the resin sheet into the first opening of the metal cylinder from the positive electrode current collector tab side, and position the electrode body with the resin sheet inside the metal cylinder. A method for manufacturing batteries, including the invention of a battery.

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