Battery and method for manufacturing the same

Abstract

To provide a highly reliable battery.SOLUTION: The battery 1 includes the laminated body 100 having the first electrode layer 110, the second electrode layer 120, and the solid electrolyte layer 130 located between the first electrode layer 110 and the second electrode layer 120, and the cylindrical body 20, and the laminated body 100 is the wound body 10 wound in contact with the inner surface 21 of the cylindrical body 20 along the circumferential direction in the cylindrical body 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to batteries and methods for manufacturing the same. [Background technology]

[0002] There is a demand for technologies aimed at improving the performance and reliability of batteries. As technologies relating to such batteries, for example, Patent Documents 1 and 2 disclose batteries constructed by winding a strip-shaped power generating element that includes an electrode layer, a solid electrolyte layer, and a counter electrode layer in this order. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-67906 [Patent Document 2] International Publication No. 2010 / 95230 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a need in the art for a highly reliable battery. Accordingly, the present disclosure provides a highly reliable battery and a method for manufacturing the same. [Means for solving the problem]

[0005] A battery according to one embodiment of the present disclosure includes a laminate having a first electrode layer, a second electrode layer, and a solid electrolyte layer located between the first electrode layer and the second electrode layer, and a cylindrical body, wherein the laminate is a wound body wound circumferentially within the cylindrical body in contact with the inner surface of the cylindrical body.

[0006] A method for manufacturing a battery according to one embodiment of the present disclosure includes a step of winding a laminate having a first electrode layer, a second electrode layer, and a solid electrolyte layer located between the first electrode layer and the second electrode layer, and a step of isostatically pressing the wound laminate within a cylindrical body. [Effects of the Invention]

[0007] According to the present disclosure, a highly reliable battery can be provided. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional end view showing a schematic configuration of a battery according to an embodiment. [Figure 2] FIG. 2 is a top view showing a schematic configuration of a battery according to an embodiment. [Figure 3] FIG. 3 is a perspective view showing a schematic configuration of a wound body disposed inside a cylindrical body of a battery according to an embodiment. [Figure 4] FIG. 4 is a perspective view showing a schematic configuration of a cylindrical body of a battery according to an embodiment. [Figure 5A] FIG. 5A is a plan view showing a schematic configuration of an example of an unwound laminate according to an embodiment. [Figure 5B] FIG. 5B is a plan view showing a schematic configuration of another example of an unwound laminate according to an embodiment. [Figure 5C] FIG. 5C is a plan view showing a schematic configuration of another example of an unwound laminate according to an embodiment. [Figure 5D] FIG. 5D is a plan view showing a schematic configuration of another example of an unwound laminate according to an embodiment. [Figure 5E] FIG. 5E is a plan view showing a schematic configuration of another example of an unwound laminate according to an embodiment. [Figure 5F] FIG. 5F is a plan view showing a schematic configuration of another example of an unwound laminate according to an embodiment. [Figure 6A] FIG. 6A is a perspective view showing a schematic configuration of another example of a cylindrical body of a battery according to an embodiment. [Figure 6B] FIG. 6B is a perspective view showing a schematic configuration of another example of a cylindrical body of a battery according to an embodiment. [Figure 6C]FIG. 6C is a perspective view showing a schematic configuration of another example of a cylindrical body of a battery according to an embodiment. [Figure 6D] FIG. 6D is a cross-sectional view showing a schematic configuration of another example of a cylindrical body of a battery according to an embodiment. [Figure 6E] FIG. 6E is a cross-sectional view showing a schematic configuration of another example of a cylindrical body of a battery according to an embodiment. [Figure 7] FIG. 7 is a cross-sectional end view showing a schematic configuration of a battery according to a first modification of the embodiment. [Figure 8] FIG. 8 is a cross-sectional end view showing a schematic configuration of a battery according to a second modification of the embodiment. [Figure 9] FIG. 9 is a top view showing a schematic configuration of a battery according to a third modification of the embodiment. [Figure 10] FIG. 10 is a cross-sectional end view showing a schematic configuration of a battery according to a fourth modification of the embodiment. [Figure 11] FIG. 11 is a perspective view showing a schematic configuration of a wound body arranged inside a cylindrical body according to the fourth modification of the embodiment. [Figure 12] FIG. 12 is a perspective view showing a schematic configuration of a wound body arranged inside a cylindrical body according to a fifth modification of the embodiment. [Figure 13] FIG. 13 is a flowchart showing a method for manufacturing a battery according to the embodiment and each of the modifications. [Figure 14A] FIG. 14A is a perspective view illustrating one step of the method for manufacturing the battery according to the embodiment and each of the modifications. [Figure 14B] FIG. 14B is a perspective view illustrating one step of the method for manufacturing the battery according to the embodiment and each of the modifications. [Figure 14C] FIG. 14C is a perspective view illustrating one step of the method for manufacturing the battery according to the embodiment and each of the modifications. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Summary of the Disclosure) A battery according to a first aspect of the present disclosure includes a stack having a first electrode layer, a second electrode layer, and a solid electrolyte layer located between the first electrode layer and the second electrode layer, and a cylindrical body, wherein the stack is a wound body wound circumferentially within the cylindrical body in contact with the inner surface of the cylindrical body.

[0010] This allows the wound body to be housed inside the cylindrical body, protecting it from external stress. This results in a highly reliable battery. Furthermore, unlike stacked-type batteries, the winding process and pressing process are not repeated, and instead, the battery is continuously wound and pressed together, resulting in a highly productive battery.

[0011] A battery according to a second aspect of the present disclosure is a battery according to the first aspect of the present disclosure, wherein when the length of the laminate in the axial direction of the cylindrical body is defined as the width of the laminate, the width of the laminate at a first portion is shorter than the width of the laminate at a second portion, and the first portion is located closer to the inner end of the winding than the second portion.

[0012] This suppresses short circuits during pressure treatment after winding, resulting in a highly reliable battery. Furthermore, by combining the number of windings with the change in the width of the laminate as a capacity design factor, the design range of capacity can be expanded.

[0013] A battery according to a third aspect of the present disclosure is the battery according to the second aspect of the present disclosure, wherein the width of the laminate decreases continuously from the second portion to the first portion.

[0014] This allows for handling and winding without concentrating stress on the laminate, thereby preventing short circuits and damage to the laminate. Furthermore, because the capacitance changes continuously, it is easier to predict the capacitance change of the laminate. This makes it easier to design the capacitance.

[0015] A battery according to a fourth aspect of the present disclosure is the battery according to the second aspect of the present disclosure, wherein the width of the laminate decreases stepwise from the second portion to the first portion.

[0016] This allows the discontinuous width change area to bite into and catch on the lower layer of the winding, preventing loosening of the wound body after pressure integration. This prevents loosening and shifting of the wound body due to vibration or expansion and contraction during charging and discharging, resulting in a battery with excellent stability of characteristics.

[0017] A battery according to a fifth aspect of the present disclosure is a battery according to any one of the second to fourth aspects of the present disclosure, wherein the first portion and the second portion are located at the innermost portion of the wound body.

[0018] This makes it possible to obtain a highly reliable battery while suppressing a decrease in capacity.

[0019] A battery according to a sixth aspect of the present disclosure is the battery according to any one of the first to fifth aspects of the present disclosure, further comprising a loosening suppression material that suppresses loosening of the wound body.

[0020] This can prevent the wound body from loosening, thereby realizing a battery with excellent stability of characteristics.

[0021] A battery according to a seventh aspect of the present disclosure is the battery according to the sixth aspect of the present disclosure, wherein the slack suppression material is a tape-shaped member.

[0022] This allows any location of the wound body to be fixed with a tape-like member. For example, by using an adhesive tape, it is possible to firmly prevent the wound body from loosening while suppressing increases in weight and volume.

[0023] A battery according to an eighth aspect of the present disclosure is the battery according to the seventh aspect of the present disclosure, wherein the tape-shaped member fixes an inner peripheral end of the wound body.

[0024] This fixes the inner peripheral end of the wound body, which could be the starting point for loosening, and thus firmly prevents loosening. Furthermore, after the wound body is fixed, the loosening prevention material can also be integrated with the wound body by, for example, isostatic pressing, resulting in an even stronger structure. This allows for the realization of a battery with even more stable characteristics.

[0025] A battery according to a ninth aspect of the present disclosure is a battery according to the seventh aspect of the present disclosure, wherein the tape-shaped member is arranged in a ring shape around the axis of the cylindrical body and along the innermost periphery of the wound body.

[0026] This allows the wound body to be firmly fixed from the inside as a whole. This makes it possible to realize a battery with even more stable characteristics. The tape-shaped member may be wound multiple times around the innermost periphery of the wound body, or multiple tape-shaped members may be provided. This makes it possible to more firmly prevent loosening at any desired location, such as a location that is prone to loosening.

[0027] A battery according to a tenth aspect of the present disclosure is the battery according to the ninth aspect of the present disclosure, wherein the tape-shaped member is embedded in the innermost periphery of the wound body.

[0028] This allows the tape-shaped member to exhibit a strong anchoring effect, thereby realizing a battery with excellent stability of characteristics. The embedding of the tape-shaped member into the wound body can be performed, for example, by applying pressure to the wound body and the tape-shaped member together.

[0029] A battery according to an eleventh aspect of the present disclosure is the battery according to any one of the seventh to tenth aspects of the present disclosure, wherein the tape-shaped member is a thermal expansion member.

[0030] This allows the wound body to be fixed stably and with good workability by inserting a ring-shaped or columnar thermal expansion member inside the wound body and heating it to expand it.

[0031] A battery according to a twelfth aspect of the present disclosure is a battery according to any one of the first to eleventh aspects of the present disclosure, wherein the laminate has a chamfered shape on at least one of the inner peripheral end and the outer peripheral end of the winding.

[0032] This prevents deformation of the inner or outer peripheral end of the wound body during winding or pressure application, and also prevents short circuits that tend to occur due to deformation. It also prevents delamination that tends to occur at the start or end due to thermal cycling and thermal shock.

[0033] A battery according to a thirteenth aspect of the present disclosure is a battery according to any one of the second to fifth aspects of the present disclosure, wherein the length of the cylindrical body in the axial direction is longer than the width of the second portion of the laminate.

[0034] This allows the laminate to be positioned up to its end within the cylindrical body even if there is a variation in width of the laminate, a misalignment in winding, or elongation of the laminate due to lamination or pressing, which sufficiently reduces the possibility of the laminate protruding from the end of the cylindrical body in the axial direction, thereby suppressing deformation of the laminate during isostatic pressing, etc., and suppressing short circuits.

[0035] A battery according to a fourteenth aspect of the present disclosure is the battery according to any one of the first to thirteenth aspects of the present disclosure, wherein the cylindrical body includes a conductor.

[0036] This allows the cylindrical body and the wound body to come into contact at the outermost periphery of the wound body for electrical connection, so that the cylindrical body can also function as a terminal. This eliminates the need to form a terminal electrode. Furthermore, because the cylindrical body and the wound body, which function as a terminal, are firmly fixed together, the device is highly reliable, easy to manufacture, and compact.

[0037] A battery according to a fifteenth aspect of the present disclosure is the battery according to any one of the first to fourteenth aspects of the present disclosure, wherein the cylindrical body includes a porous member.

[0038] This reduces the weight of the cylindrical body and improves the weight energy density. Furthermore, by embedding a portion of the laminate in the pores, the friction on the surface in contact with the laminate increases, suppressing loosening and misalignment of the winding. This results in a battery with high weight energy density and high reliability.

[0039] A battery according to a 16th aspect of the present disclosure is a battery according to any one of the first to fifteenth aspects of the present disclosure, wherein, when viewed from the axial direction of the cylindrical body, the size of one end of the cylindrical body in the axial direction is different from the size of the other end of the cylindrical body in the axial direction.

[0040] This clarifies the orientation of the wound body, making it easier to control the orientation of the wound body during the manufacturing process, improving quality and productivity, and thus enabling high-quality batteries to be produced with good productivity.

[0041] A battery according to a seventeenth aspect of the present disclosure is the battery according to any one of the first to sixteenth aspects of the present disclosure, wherein the cylindrical body has a rough surface portion on its inner surface.

[0042] This makes it easier to firmly integrate the wound body and the cylindrical body, improving the shock resistance and vibration resistance of the battery. Furthermore, when the cylindrical body functions as a terminal, the surface area of ​​the electrical connection between the cylindrical body and the wound body increases, reducing connection resistance and improving battery performance.

[0043] A battery according to an eighteenth aspect of the present disclosure is the battery according to any one of the first to seventeenth aspects of the present disclosure, wherein the cylindrical body has a resin portion in contact with the laminate.

[0044] This prevents the wound body from sliding against the cylindrical body, and the softness of the resin part allows for stress absorption, suppressing deformation of the wound body and preventing short circuits and breakage. This also reduces the weight of the cylindrical body, allowing for increased capacity and energy density.

[0045] A battery according to a nineteenth aspect of the present disclosure is the battery according to any one of the first to eighteenth aspects of the present disclosure, further comprising a flange provided so as to protrude inward from the cylindrical body.

[0046] This allows the flange to restrict and control the position of the laminate to a predetermined location, thereby preventing misalignment of the wound body during and after winding. This makes it easier to create a uniform wound body. As a result, a highly reliable battery with excellent shock and vibration resistance can be obtained.

[0047] A battery according to a twentieth aspect of the present disclosure is the battery according to any one of the first to nineteenth aspects of the present disclosure, wherein the cylindrical body has a recess into which the laminate is inserted.

[0048] This allows the end of the winding to be housed in the recess, preventing loosening of the wound body during and after winding, thereby reducing variations in characteristics and changes in characteristics due to environmental changes such as impacts and thermal cycling, resulting in a highly reliable battery.

[0049] A battery according to a twenty-first aspect of the present disclosure is the battery according to the twentieth aspect of the present disclosure, wherein the cylindrical body has a rough surface portion on the inner surface of the recess.

[0050] This strengthens the effect of fixing the position of the laminate inserted into the recess due to increased friction with the laminate, thereby improving the effect of preventing the wound body from loosening and providing a highly reliable battery.

[0051] A battery according to a twenty-second aspect of the present disclosure is the battery according to the twentieth aspect of the present disclosure, further comprising a resin member that covers the inner surface of the recess.

[0052] This allows the laminate inserted into the recess to be fixed in place without significantly increasing its weight, resulting in a lightweight, highly reliable battery. Furthermore, the ends of the electrode layers, which are prone to delamination, can be fixed with the insulating resin, suppressing delamination from the ends, which is prone to occur due to thermal cycling, etc., resulting in a lightweight, highly reliable battery.

[0053] A battery according to a 23rd aspect of the present disclosure is a battery according to any one of the first to 22nd aspects of the present disclosure, wherein the cylindrical body has a step absorbing portion that absorbs steps in the winding of the laminate.

[0054] This makes it possible to absorb steps at the ends of the windings, thereby suppressing deformation and breakage of the laminate.

[0055] A method for manufacturing a battery according to a 24th aspect of the present disclosure includes the steps of winding a laminate having a first electrode layer, a second electrode layer, and a solid electrolyte layer located between the first electrode layer and the second electrode layer, and isostatically pressing the wound laminate within a cylindrical body.

[0056] This allows the cylindrical body and the laminate to be uniformly and firmly integrated, thereby enabling the manufacture of a highly reliable battery.

[0057] A battery manufacturing method according to a 25th aspect of the present disclosure is a battery manufacturing method according to the 24th aspect of the present disclosure, in which the isostatic pressing step is carried out after covering at least a portion of the innermost periphery of the wound laminate with an elastic body.

[0058] By covering at least a portion of the laminate with the elastic body, the cylindrical body and the laminate can be uniformly and firmly integrated while suppressing deformation and breakage, thereby enabling the production of a highly reliable battery.

[0059] Hereinafter, the embodiments will be specifically described with reference to the drawings.

[0060] The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection configurations, manufacturing method steps, and process order shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components not described in the independent claims are described as optional components.

[0061] In addition, the drawings are not necessarily strict illustrations, and the same reference numerals are used to designate substantially the same components in the drawings, and redundant explanations are omitted or simplified.

[0062] In the present specification and drawings, the x-axis, y-axis, and z-axis represent the three axes of a three-dimensional Cartesian coordinate system. In each embodiment, the z-axis direction is the axis direction.

[0063] In addition, in this specification, the terms "inside" and "outside" refer to the direction toward the center of the cylindrical body as "inside (inward)" and the direction away from the center as "outside (outward)."

[0064] Furthermore, in this specification, the terms "above" and "below" in the stacking structure of a laminate do not refer to the upward direction (vertically upward) and downward direction (vertically downward) in absolute spatial recognition, but are used as terms defined by a relative positional relationship based on the stacking order in the stacking structure. Furthermore, the terms "above" and "below" are applied not only to a case where two components are arranged with a gap between them and another component exists between them, but also to a case where two components are arranged closely together and the two components are in contact with each other.

[0065] Furthermore, in this specification, ordinal numbers such as "first" and "second" do not refer to the number or order of components unless otherwise specified, but are used to avoid confusion and distinguish between components of the same type.

[0066] (Embodiment) [Battery Overview] First, the battery according to the present embodiment will be described.

[0067] FIG. 1 is a cross-sectional end view showing a schematic configuration of a battery 1 according to the present embodiment. FIG. 2 is a top view showing a schematic configuration of the battery 1 according to the present embodiment. FIG. 3 is a perspective view showing a schematic configuration of a wound body 10 arranged in a cylindrical body 20 of the battery 1 according to the present embodiment, i.e., a wound laminate 100. Specifically, FIG. 2 is a plan view seen from the positive side of the z-axis. FIG. 1 shows a cross-sectional end face when cut at the position indicated by line II in FIG. 2. Note that in FIG. 1, the number of windings of the laminate 100 is simplified as 2 (two windings) to show the layer structure of the laminate 100. The number of windings of the laminate 100 is one or more, and may be, for example, 10 or more as shown in FIG. 3.

[0068] 1 , the battery 1 includes a laminate 100 and a cylindrical body 20. The laminate 100 is a wound body 10 that is wound circumferentially within the cylindrical body 20 in contact with the inner surface 21 of the cylindrical body 20. The battery 1 further includes a first flange 31, a second flange 32, a first terminal electrode 40, a second terminal electrode 50, and a resin member 60.

[0069] The laminate 100 includes a first electrode layer 110, a solid electrolyte layer 130, and a second electrode layer 120, in this order. The solid electrolyte layer 130 is located between the first electrode layer 110 and the second electrode layer 120. As shown in FIG. 1 , the first electrode layer 110 includes a first active material layer 111 and a first current collector 112. The second electrode layer 120 includes a second active material layer 121 and a second current collector 122.

[0070] The laminate 100 is formed in a strip shape that is long in one direction. The laminate 100 can also be called an electrode plate or an electrode plate. As shown in FIG. 1, the laminate 100 is a wound body 10 wound circumferentially within a cylindrical body 20 in contact with the inner surface 21 of the cylindrical body 20, and is integrated with the cylindrical body 20. A space penetrating in the axial direction is provided at the center of the wound body 10. As shown in FIG. 3, the width of the laminate 100 narrows in the last turn at the inner peripheral end of the winding. The width of the laminate 100 refers to the length of the laminate 100 in the axial direction (z-axis direction) of the cylindrical body 20. The specific shape of the laminate 100 and the specific configuration of each layer and each current collector included in the laminate 100 will be described later.

[0071] The cylindrical body 20 is a member having an internal space into which the wound laminate 100 is inserted. The outermost periphery of the wound laminate 100 is in contact with the inner surface 21 of the cylindrical body 20. In this embodiment, the cylindrical body 20 includes a conductor. Specifically, the cylindrical body 20 is substantially made of metal. More specifically, the cylindrical body 20 is a cylindrical body made of SUS (stainless steel). The cylindrical body 20 is electrically connected to the first electrode layer 110 of the laminate 100. The cylindrical body 20 is a rigid body having rigidity, and is, for example, a member harder than the laminate 100.

[0072] The cylindrical body 20 is not a laminate film, and has a Young's modulus higher than that of a general laminate film. For example, the Young's modulus of the cylindrical body 20 is 10 GPa or more. The Young's modulus of a general laminate film is less than 1 GPa. In other words, the Young's modulus of the cylindrical body 20 is one order of magnitude higher than that of a general laminate film. The upper limit of the Young's modulus of the cylindrical body 20 is not particularly limited, but is, for example, 1000 GPa.

[0073] Furthermore, the cylindrical body 20 has a higher thermal conductivity than a typical laminate film. For example, the thermal conductivity of the cylindrical body 20 is 10 W / (m·K) or more. The thermal conductivity of the cylindrical body 20 is one order of magnitude higher than the thermal conductivity of a typical laminate film. The upper limit of the thermal conductivity of the cylindrical body 20 is not particularly limited, but is, for example, 400 W / (m·K).

[0074] 4, the cylindrical body 20 includes a slit 22. The slit 22 is an example of a recess into which the laminate 100 is inserted. Specifically, the slit 22 is a through-hole that connects the outside of the cylindrical body 20 with the internal space, and into which the outer peripheral end of the winding of the laminate 100 is inserted.

[0075] In this embodiment, since the slits 22 communicate with the internal space, it is possible to adjust the length of the laminate 100 that is pulled out from the internal space of the cylindrical body 20 to the outside through the slits 22. This makes it possible to prevent the laminate 100 from shifting in position and detaching from the slits 22. Furthermore, by adjusting the amount of the laminate 100 that is pulled out, it is also possible to adjust the capacity of the battery 1 (specifically, to reduce the capacity).

[0076] The slits 22 are large enough to accommodate the operation of pulling out and fixing the outer peripheral end of the laminate 100, as well as dimensional fluctuations that occur due to expansion and contraction during charging and discharging. For example, the cross-sectional size of the outer peripheral end of the laminate 100 is set as a reference value, and the length of each side of the slits 22 is set to be 105% to 130% of that reference value. The size of the slits 22 may be set arbitrarily depending on the accuracy of the operation and the magnitude of dimensional fluctuations that occur due to expansion and contraction. The slits 22 may be cut out from one end of the cylindrical body 20 to the other end in the axial direction.

[0077] Furthermore, the corners and ridges of the slits 22 may be chamfered to prevent damage to the laminate 100 due to contact with the laminate 100. That is, the corners and ridges of the slits 22 may be provided with rounded or curved portions. The C-cut length of the curved portion is, for example, 0.1 mm or more and 1.0 mm or less, and the R radius of the curved portion is, for example, 1 mm or more and 5 mm or less, but is not limited to these.

[0078] The length L of the cylindrical body 20 in the axial direction is longer than the width W2 of the laminate 100. The width W2 is, for example, the maximum width of the laminate 100. Even if the width of the laminate 100 varies or the laminate 100 shifts during winding, or if the laminate 100 stretches due to lamination or pressing, the laminate 100 can contact the cylindrical body 20 up to the end thereof. This sufficiently reduces the possibility of the laminate 100 protruding from the end in the axial direction, thereby suppressing deformation of the laminate 100 during isostatic pressing, etc., and suppressing short circuits.

[0079] The length L of the cylindrical body 20 may be made longer than the width W2 of the laminate 100 by any amount, but is determined taking into account variations in process accuracy and the elongation of the laminate 100. Furthermore, by lengthening the cylindrical body 20, the first flange 31 and the second flange 32 can be provided with ample space. Note that if the length L of the cylindrical body 20 is too long, it will increase the volume and weight of the battery 1, so it should be designed to an appropriate length. For example, the difference between L and W2 is 5 μm or more and 50 mm or less, but is not limited to this.

[0080] The cylindrical body 20 may include a porous member. For example, a porous metal material formed using various metals or alloy materials such as stainless steel, titanium, copper, nickel, and aluminum can be used as the cylindrical body 20. The porosity of the porous metal material is, for example, 5% or more and 90% or less, but is not limited to this.

[0081] The weight of the cylindrical body 20 is reduced, improving the weight energy density of the battery 1. Furthermore, by embedding a portion of the laminate 100 in the pores of the cylindrical body 20, the friction of the surface in contact with the laminate 100 increases, suppressing loosening and misalignment of the winding. Therefore, a battery 1 with high weight energy density and high reliability can be obtained.

[0082] The material and shape of the cylindrical body 20 are designed according to the intended use, such as the desired weight energy density. The cylindrical body 20 may be formed by combining a plurality of different materials. For example, the surface of the cylindrical body 20 that comes into contact with the laminate 100 may be made of a material (e.g., a material with high conductivity) selected in consideration of electrochemical stability during operation of the battery 1. Specifically, the cylindrical body 20 may include a core material and a plating layer formed on the surface of the core material using a material different from the core material.

[0083] The first flange 31 and the second flange 32 are provided so as to protrude toward the inside of the cylindrical body 20. In the present embodiment, both the first flange 31 and the second flange 32 are provided so as to protrude toward both the inside and outside of the cylindrical body 20. The first flange 31 and the second flange 32 are provided at both end portions of the cylindrical body 20, respectively, so that the wound body 10 is disposed therebetween. Note that at least one of the first flange 31 and the second flange 32 does not have to be provided. Furthermore, the first flange 31 or the second flange 32 may be provided near the center of the cylindrical body 20, rather than at the end portion thereof.

[0084] In this embodiment, the first flange 31 and the second flange 32 have the same shape and are made of the same material. Specifically, as shown in FIG. 2, the first flange 31 and the second flange 32 are formed in a disk shape with a through-hole in the center. The first flange 31 and the second flange 32 may be different in at least one of their shapes and materials. The central through-hole provided in the first flange 31 is provided to allow the first terminal electrode 40 to extend to the outside of the cylindrical body 20. The second flange 32 does not necessarily have to have a through-hole in the center.

[0085] The provision of the first flange 31 and the second flange 32 can suppress misalignment of the laminate 100 after placement inside the cylindrical body 20. Furthermore, the portions of the first flange 31 and the second flange 32 that protrude outward from the cylindrical body 20 can protect the side surfaces of the cylindrical body 20. For example, the first flange 31 and the second flange 32 completely cover the wound body 10 when viewed from the axial direction (z-axis direction). In other words, the inward protrusion distance of each of the first flange 31 and the second flange 32 is equal to or greater than the thickness of the wound body 10. The inward protrusion distance of the first flange 31 is the distance perpendicular to the axial direction of the cylindrical body 20, and is the distance from the inner surface 21 of the cylindrical body 20 to the outer peripheral edge of the through-hole provided in the center of the first flange 31. The same applies to the inward protrusion distance of the second flange 32.

[0086] The first flange 31 and the second flange 32 are formed using a material different from that of the cylindrical body 20. The first flange 31 and the second flange 32 are formed using an insulating material. In this embodiment, as an example, the first flange 31 and the second flange 32 are attached using flanges made of a Bakelite-based material, which has excellent heat resistance and insulating properties at temperatures of approximately 200°C or higher. In this way, by forming the first flange 31 and the second flange 32 using a resin material that is lighter than metal, the weight of the battery 1 can be reduced. Furthermore, the insulating properties of the first flange 31 and the second flange 32 can prevent short circuits due to contact with the wound body 10. The first flange 31 and the second flange 32 may be integral with the cylindrical body 20 and formed using a metal material. In this case, an insulating layer may be provided on the surface of each of the first flange 31 and the second flange 32 facing the wound body 10. The first flange 31 and the second flange 32 are fixed to the cylindrical body 20 using, for example, an adhesive or the like. Alternatively, the cylindrical body 20 may be provided with a protrusion, and the first flange 31 and the second flange 32 may be fixed by being engaged with the protrusion. There is no particular limitation on the method for fixing the first flange 31 and the second flange 32 to the cylindrical body 20.

[0087] At least one of the first flange 31 and the second flange 32 can restrict and control the position of the laminate 100 at a predetermined location, thereby preventing the wound body 10 from shifting position after being placed inside the cylindrical body 20. This makes it easier to create a uniform wound body 10. This allows for the production of a highly reliable battery 1 that is excellent in shock resistance and vibration resistance.

[0088] Both the first terminal electrode 40 and the second terminal electrode 50 are made of conductive materials. For example, the first terminal electrode 40 and the second terminal electrode 50 are made of a metal or alloy such as copper, aluminum, or SUS. The first terminal electrode 40 and the second terminal electrode 50 function as the positive and negative terminals of the battery 1.

[0089] The first terminal electrode 40 is electrically connected to the second electrode layer 120 of the laminate 100. Specifically, the first terminal electrode 40 is electrically connected to the second electrode layer 120 via an Ag-based highly conductive resin (not shown). For example, the first terminal electrode 40 is connected to the surface of the second electrode layer 120 at the innermost periphery of the wound body 10, and is drawn out via a through-hole provided in the first flange 31. The first terminal electrode 40 may be plated with solder such as Sn or AuSn, which allows for easy solder connection to the laminate 100.

[0090] The second terminal electrode 50 is electrically connected to the first electrode layer 110 of the laminate 100. Specifically, the second terminal electrode 50 is electrically connected to the first electrode layer 110 via the conductive cylindrical body 20. For example, the second terminal electrode 50 is in contact with the outer surface of the cylindrical body 20, but may also be in contact with a portion of the inner surface 21 of the cylindrical body 20 that is not in contact with the wound body 10. The second terminal electrode 50 is joined to the cylindrical body 20 by connection with conductive resin or solder, or by screwing. The second terminal electrode 50 may be plated with solder such as Sn or AuSn, which facilitates solder connection to the cylindrical body 20.

[0091] The resin member 60 is provided so as to cover a portion of the outer surface of the cylindrical body 20. In this embodiment, the resin member 60 covers the inner surface of the slit 22 provided in the cylindrical body 20 and the outer surface of the cylindrical body 20. The resin member 60 also covers the outer peripheral end of the wound laminate 100. For example, the resin member 60 is formed by applying an insulating resin material using a dispenser (not shown) and curing it. By providing the resin member 60, the outer peripheral end of the laminate 100, which is prone to deformation or peeling, can be impregnated with the resin material. Since the outer peripheral end of the laminate 100 is firmly integrated with the cylindrical body 20, the reliability of the battery 1 can be improved.

[0092] The resin member 60 can be made of a general epoxy resin, which is a lightweight resin material with excellent sealing properties. This can increase the weight energy density of the battery 1 and improve its reliability. Furthermore, for example, the resin member 60 may contain an inorganic filler (powder) with excellent thermal conductivity, such as alumina, boron nitride, magnesium oxide, or yttrium oxide, in order to improve thermal conductivity. This improves the heat dissipation properties of the resin member 60 and suppresses heat generation during battery 1 operation, resulting in a more reliable battery 1. The highly thermally conductive powder can be, for example, any shape with a particle size of 0.1 μm or more and 100 μm or less in maximum width.

[0093] [Planar shape of laminate (wound body)] Next, a specific planar shape of the laminate 100 and modifications thereof will be described with reference to Figures 5A to 5F. Figures 5A to 5F are plan views each showing a schematic configuration of an example of an unwound laminate according to this embodiment. In describing the common features of the laminates 100A to 100F shown in Figures 5A to 5F, there is no need to distinguish between the laminates 100A to 100F, and therefore the laminates will be described as the laminate 100.

[0094] In each figure, the outer peripheral end is the end of the two ends of the laminate 100 in the winding direction that is farther from the central axis of the winding when the laminate 100 is wound. The outer peripheral end of the laminate 100 and its vicinity contact the inner surface 21 of the cylindrical body 20. The inner peripheral end is the end of the two ends of the laminate 100 in the winding direction that is closer to the central axis of the winding when the laminate 100 is wound. From the outer peripheral end to the inner peripheral end, the laminate 100 moves away from the cylindrical body 20, and the inner peripheral end of the laminate 100 is located at the innermost periphery of the winding. In each figure, the area shaded with dots corresponds to the innermost periphery of the winding. The innermost periphery is the part that is not covered by the laminate 100 and is exposed to the inside when the laminate 100 is wound around the cylindrical body 20.

[0095] As shown in FIGS. 5A to 5F , the laminate 100 has portions with different widths. Specifically, the width W1 of the first portion P1 of the laminate 100 is shorter than the width W2 of the second portion P2 of the laminate 100. For example, the width W1 is 50% or more but less than 95% of the width W2, and is, for example, 80% of the width W2. The first portion P1 is located closer to the inner circumferential end of the winding than the second portion P2. In the wound state, the first portion P1 is located farther from the inner surface 21 of the cylindrical body 20 than the second portion P2 and closer to the central axis of the cylindrical body 20. In the example shown in each figure, the first portion P1 is the inner circumferential end of the winding, and the second portion P2 corresponds to the first position where the width of the laminate 100 becomes shorter than the width of the outer circumferential end when tracing the direction from the outer circumferential end of the laminate 100 toward the inner circumferential end. In each of the laminates 100A to 100F in the drawings, the range from the second portion P2 to the first portion P1 is considered to be the narrow portion.

[0096] In the laminate 100A shown in FIG. 5A, the width continuously decreases from the second portion P2 to the first portion P1. Specifically, the width of the laminate 100A continuously decreases evenly from both sides from the second portion P2 to the first portion P1. The rate of width reduction is constant, but may vary. That is, the shape of the narrow portion 101A is an isosceles trapezoid rotated 90 degrees, but the legs of the trapezoid may be curved inward or outward. Furthermore, the rate of width reduction may differ for each leg.

[0097] In the laminate 100B shown in FIG. 5B, the width continuously decreases from the second portion P2 to the first portion P1. Specifically, the width of the laminate 100B continuously decreases at a constant rate from one side to the first portion P1. The shape of the narrow portion 101B is a trapezoid rotated 90 degrees, with one leg perpendicular to the upper and lower bases. The remaining leg is a straight line segment, but may be curved outward or inward.

[0098] In the laminate 100C shown in FIG. 5C, the width decreases in a stepwise manner from the second portion P2 to the first portion P1. Specifically, in the laminate 100C, the width changes from width W2 to width W1 at the second portion P2. In other words, the width of the laminate 100C changes in one step. The narrow portion 101C is a rectangle with a side length of W1.

[0099] In the laminate 100D shown in FIG. 5D, the width decreases in stages from the second portion P2 to the first portion P1. Specifically, in the laminate 100D, the width changes in two stages from the second portion P2 to the first portion P1. The narrow portion 101D includes a first narrow portion 102D having a side length of W3 and a second narrow portion 103D having a side length of W1. The relationship W2>W3>W1 is satisfied.

[0100] In laminate 100D, first narrow portion 102D may have a width that changes continuously from second portion P2 to third portion P3, as in narrow portion 101A shown in FIG. 5A or narrow portion 101B shown in FIG. 5B. Alternatively, second narrow portion 103D may have a width that changes continuously from third portion P3 to first portion P1. In other words, laminate 100 may include a combination of a portion where the width decreases stepwise and a portion where the width decreases continuously. The number of steps in the width decrease is not particularly limited.

[0101] The laminate 100E shown in FIG. 5E has a chamfered shape on at least one of the inner peripheral end and the outer peripheral end of the winding. Specifically, the laminate 100E has a rounded portion 104r on each of the inner peripheral end and the outer peripheral end. The rounded portion 104r is formed, for example, by forming the laminate 100A shown in FIG. 5A and then performing rounded chamfering on the four corners. The rounded portion 104r has a radius of, for example, 1 mm or more and 5 mm or less, but is not limited thereto.

[0102] The laminate 100F shown in FIG. 5F has a chamfered shape on at least one of the inner and outer peripheral ends of the winding. Specifically, the laminate 100F has a C-shaped portion 104c on each of the inner and outer peripheral ends. The C-shaped portion 104c is formed, for example, by forming the laminate 100A shown in FIG. 5A and then chamfering the four corners. The C-cut length of the C-shaped portion 104c is, for example, 0.1 mm or more and 1 mm or less, but is not limited thereto. The inclination of the C-cut is 45°, but is not limited thereto and may be, for example, 30° or more and 60° or less.

[0103] In the case of the laminates 100E and 100F having chamfered edges, the widths W1 and W2 are defined as the widths without chamfered edges. The rounded portions 104r and the curved portions 104c are formed using a cutter, a mold, or laser processing. The radius of the rounded portion 104r or the length of the curved portion 104c is set arbitrarily in consideration of the characteristics, reliability, and processability of the battery 1.

[0104] In each figure, at least a portion of the narrow width portions 101A to 101D is located at the innermost periphery of the laminate 100. For example, in the laminate 100A shown in FIG. 5A, the entire narrow width portion 101A is located at the innermost periphery. Specifically, the second portion P2 of the laminate 100A is the starting point of the innermost periphery, and both the second portion P2 and the first portion P1 are located at the innermost periphery. Also, for example, in the laminate 100B shown in FIG. 5B, only a portion of the narrow width portion 101B is located at the innermost periphery. In other words, while the first portion P1 of the laminate 100B is located at the innermost periphery, the second portion P2 of the laminate 100B is not located at the innermost periphery.

[0105] The innermost periphery of the laminate 100 wound inside the cylindrical body 20 is the part most likely to stretch when pressure is applied. By providing narrow width portions 101A to 101D at the innermost periphery, even if the narrow width portions 101A to 101D are deformed by pressure, they are less likely to protrude in the width direction of the laminate 100. If protrusion does occur, it can cause a short circuit and deterioration of characteristics at the protruding portion. Therefore, by using the laminates 100A to 100F shown in each figure, the reliability of the battery 1 can be improved.

[0106] The rate of width reduction of the laminate 100 is, for example, 20% per winding, but is not limited to this. It may be set taking into consideration fluctuations in the manufacturing process and operation of the battery 1, such as winding accuracy, the amount of expansion of the laminate 100 when pressure is applied, or expansion and contraction due to charge and discharge operations. For example, if the amount of widthwise deviation during winding is 0% to 10% and the amount of widthwise expansion of the laminate 100 when pressure is applied is 0% to 10%, a width reduction of approximately 20% can improve the reliability of the battery 1 during manufacturing.

[0107] The positional relationship between the innermost periphery and the narrow portions 101A to 101D is not limited to the examples shown in the figures. For example, in each figure, the second portion P2 may be the starting point of the innermost periphery. Also, in each figure, the starting point of the innermost periphery may be located closer to the inner periphery than the second portion P2. Alternatively, in each figure, the starting point of the innermost periphery may be located closer to the outer periphery than the second portion P2. In this case, the second portion P2 is located closer to the outer periphery than the midpoint between the starting point and the end point of the innermost periphery. In other words, the narrow portions 101A to 101D occupy more than half of the innermost periphery. This improves the reliability of the battery 1.

[0108] [Layer structure of laminate (wound body)] Next, a description will be given of the specific configuration of each layer included in the laminate 100. In the following, an example will be described in which the first electrode layer 110 is a positive electrode layer and the second electrode layer 120 is a negative electrode layer, but the first electrode layer 110 may be a negative electrode layer and the second electrode layer 120 may be a positive electrode layer.

[0109] 1, the first electrode layer 110 includes a first active material layer 111 and a first current collector 112. The first active material layer 111 is provided in contact with a main surface of the first current collector 112. The first active material layer 111 is in contact with the solid electrolyte layer 130 on the main surface opposite to the main surface in contact with the first current collector 112.

[0110] The first active material layer 111 is disposed in contact with one surface of the first current collector 112 and is configured as a positive electrode active material layer. The first active material layer 111 includes at least a positive electrode active material. The first active material layer 111 is a layer mainly composed of a positive electrode material such as a positive electrode active material. The positive electrode active material is a substance in which metal ions such as lithium (Li) ions or magnesium (Mg) ions are inserted or extracted into or from the crystal structure at a potential higher than that of the negative electrode, and oxidation or reduction occurs accordingly. The type of positive electrode active material can be appropriately selected depending on the type of battery, and any known positive electrode active material can be used as long as it can maintain its properties as a positive electrode active material even after undergoing manufacturing processes such as heat treatment.

[0111] Examples of the positive electrode active material include compounds containing lithium and transition metal elements, such as oxides containing lithium and transition metal elements, and phosphate compounds containing lithium and transition metal elements. Examples of the oxides containing lithium and transition metal elements include, for example, LiNi x M 1-x such as lithium nickel composite oxides like O2, layered oxides such as lithium cobaltate (LiCoO2), lithium nickelate (LiNiO2), and lithium manganate (LiMn2O4), and lithium manganates having a spinel structure such as, for example, LiMn2O4, Li2MnO3, and LiMO2 are used. In LiNi x M 1-x O2, M is at least one element among Co, Al, Mn, V, Cr, Mg, Ca, Ti, Zr, Nb, Mo, and W. Also, x satisfies 0 < x ≤ 1. Examples of the phosphate compound containing lithium and transition metal elements include, for example, lithium iron phosphate (LiFePO4) having an olivine structure. Further, sulfides such as sulfur (S) and lithium sulfide (Li2S) can also be used as the positive electrode active material. In this case, a material in which the positive electrode active material particles are coated with or added with lithium niobate (LiNbO3) or the like can be used as the positive electrode active material. Note that only one kind of these materials may be used as the positive electrode active material, or two or more kinds of these materials may be combined and used. Also, as the positive electrode active material, one kind or a combination of two or more kinds of the above-described materials may be used.

[0112] As described above, the first active material layer 111 may contain at least a positive electrode active material, and may be a mixture layer composed of a mixture of the positive electrode active material and other additive materials. Examples of other additive materials that can be used include solid electrolytes such as inorganic solid electrolytes or sulfide solid electrolytes, conductive additives such as acetylene black, and binders such as polyethylene oxide or polyvinylidene fluoride. By mixing the positive electrode active material and other additive materials, such as the solid electrolyte, in a predetermined ratio, the first active material layer 111 can improve both the lithium ion conductivity and the electronic conductivity.

[0113] The thickness of the first active material layer 111 is, for example, not less than 5 μm and not more than 300 μm.

[0114] The first current collector 112 contacts the inner surface 21 of the cylindrical body 20 at or near the outer peripheral end of the winding on the main surface opposite to the surface contacting the first active material layer 111. This electrically connects the cylindrical body 20 to the first current collector 112. The first current collector 112 contains a conductor. For example, a conductor metal or conductor alloy such as Al, Fe, Ni, or Cu can be used as the first current collector 112. Using a conductor metal with high conductivity can reduce resistance loss and heat generation in the battery. Any conductor metal that satisfies electrochemical stability and mechanical strength can be selected and used as the first current collector 112. The first current collector 112 may have a layered structure made of multiple metals, such as a clad material.

[0115] The second electrode layer 120 is disposed opposite the first electrode layer 110 and functions as a counter electrode of the first electrode layer 110. The second electrode layer 120 includes a second active material layer 121 and a second current collector 122. The second active material layer 121 is provided in contact with a main surface of the second current collector 122. The second active material layer 121 is in contact with the solid electrolyte layer 130 on the main surface opposite to the main surface in contact with the second current collector 122.

[0116] The second active material layer 121 is configured as a negative electrode active material layer, serving as a counter electrode to the first active material layer 111. The second active material layer 121 is disposed in contact with one surface of the second current collector 122. The second active material layer 121 contains at least a negative electrode active material. The second active material layer 121 is a layer mainly composed of a negative electrode material such as a negative electrode active material. A negative electrode active material is a substance in which metal ions such as lithium (Li) ions or magnesium (Mg) ions are inserted or extracted into or from the crystal structure at a potential lower than that of the positive electrode, and oxidation or reduction occurs accordingly. The type of negative electrode active material can be appropriately selected depending on the type of battery, and known negative electrode active materials can be used.

[0117] The negative electrode active material may be, for example, TiNb2O7, lithium titanate (Li4Ti5O 12 ), zinc oxide (ZnO), and silicon oxide (SiO x The type of negative electrode active material may be any material that can maintain its function as a negative electrode active material even after undergoing manufacturing processes such as heat treatment. For example, carbon materials such as natural graphite, artificial graphite, graphite carbon fiber, or resin-baked carbon, and alloy-based materials that are mixed with a solid electrolyte may be used. Examples of alloy-based materials include LiAl, LiZn, Li3Bi, Li3Cd, Li3Sb, Li4Si, and Li 4.4 Pb, Li 4.4 Sn, Li 0.17 C or lithium alloys such as LiC6, zinc oxide (ZnO), and silicon oxide (SiO x ) and other metal oxides can be used. As the negative electrode active material, only one of these materials may be used, or two or more of these materials may be used in combination. As the negative electrode active material, one or two or more of the above-mentioned materials may be used in combination.

[0118] As described above, the second active material layer 121 may contain at least a negative electrode active material, and may be a mixture layer composed of a mixture of the negative electrode active material and other additive materials. Examples of other additive materials that can be used include solid electrolytes such as inorganic solid electrolytes or sulfide solid electrolytes, conductive additives such as acetylene black, and binders such as polyethylene oxide or polyvinylidene fluoride. By mixing the negative electrode active material and other additive materials, such as the solid electrolyte, in a predetermined ratio, the second active material layer 121 can improve both the lithium ion conductivity and the electronic conductivity.

[0119] The thickness of the second active material layer 121 is, for example, not less than 5 μm and not more than 300 μm.

[0120] The second current collector 122 is in contact with the insulating layer 160 on a main surface opposite to the surface in contact with the second active material layer 121. The second current collector 122 contains a conductor. For example, similar to the first current collector 112, the second current collector 122 can be made of a conductive metal or a conductive alloy such as Al, Fe, Ni, or Cu.

[0121] In this specification, the first current collector 112 and the second current collector 122 may be collectively referred to simply as "current collectors."

[0122] The solid electrolyte layer 130 is located between the first electrode layer 110 and the second electrode layer 120. Specifically, the solid electrolyte layer 130 is disposed between the first active material layer 111 and the second active material layer 121 and is in contact with each of them.

[0123] The solid electrolyte layer 130 includes at least a solid electrolyte. The solid electrolyte layer 130 includes, for example, a solid electrolyte as a main component. The solid electrolyte may be any known solid electrolyte for batteries that has ionic conductivity. For example, a solid electrolyte that conducts metal ions such as lithium ions or magnesium ions may be used as the solid electrolyte. The type of solid electrolyte may be appropriately selected depending on the type of conductive ions. For example, an inorganic solid electrolyte such as an oxide-based solid electrolyte, a halide-based solid electrolyte, or a sulfide-based solid electrolyte may be used as the solid electrolyte. An example of an oxide-based solid electrolyte is Li7La3Zr2O 12 , Li7Pr3Zr2O 12 Lithium-containing metal oxides such as Li2O-SiO2 or Li2O-SiO2-P2O5, Li x P y O 1-z N z Examples of usable solid electrolytes include lithium-containing metal nitrides such as lithium phosphate (Li3PO4), lithium transition metal oxides such as lithium titanium oxide, and lithium phosphate (Li3PO4). Examples of usable halide solid electrolytes include Li3AlF6 and Li2TiF6. Examples of usable sulfide solid electrolytes include lithium-containing sulfides such as Li2S-P2S5, Li2S-SiS2, Li2S-B2S3, Li2S-GeS2, Li2S-SiS2-LiI, Li2S-SiS2-Li3PO4, Li2S-Ge2S2, Li2S-GeS2-P2S5, and Li2S-GeS2-ZnS. As the solid electrolyte, only one of these materials may be used, or two or more of these materials may be used in combination.

[0124] In addition to the above solid electrolyte material, the solid electrolyte layer 130 may contain an adhesive binder such as polyethylene oxide or polyvinylidene fluoride.

[0125] The thickness of the solid electrolyte layer 130 is, for example, not less than 5 μm and not more than 150 μm.

[0126] The solid electrolyte material may be composed of an aggregate of particles or a sintered structure.

[0127] In the present embodiment, the first active material layer 111, the first current collector 112, the second active material layer 121, the second current collector 122, and the solid electrolyte layer 130 all have the same size and shape, but are not limited to this. For example, the first active material layer 111 may be larger than the first current collector 112, and the second active material layer 121 may be larger than the second current collector 122. Furthermore, the second active material layer 121, which is the negative electrode active material layer, may be larger than the first active material layer 111, which is the positive electrode active material layer. Furthermore, the solid electrolyte layer 130 may be larger than the first active material layer 111. The first active material layer 111, the second active material layer 121, and the solid electrolyte layer 130 may each have a circular or elliptical shape.

[0128] As shown in FIG. 1 , the laminate 100 is provided with an insulating layer 160. The insulating layer 160 is disposed between the first current collector 112 of the first electrode layer 110 and the second current collector 122 of the second electrode layer 120, and is provided to prevent the first electrode layer 110 and the second electrode layer 120 from coming into contact with each other and causing a short circuit. Specifically, the insulating layer 160 is provided on the main surface of the second current collector 122 opposite to the main surface that contacts the second active material layer 121. Note that, although the insulating layer 160 is not provided on the innermost periphery of the wound body 10 in FIG. 1 , the insulating layer 160 may be provided on the innermost periphery of the wound body 10.

[0129] The insulating layer 160 has electronic insulation properties. The insulating layer 160 need only have electronic conductivity and may have ionic conductivity. For example, the insulating layer 160 may be formed using the same solid electrolyte as the solid electrolyte layer 130. For example, the insulating layer 160 may be formed using various solid electrolytes or insulating materials made of inorganic or resin materials that have substantially no electronic conductivity. Note that by using a material softer than the active material, such as a resin material or a sulfide- or halogen-based solid electrolyte, for the insulating layer 160, expansion and contraction accompanying the charge and discharge operations of the battery 1 can be absorbed. This makes it possible to suppress loosening of the winding and the occurrence of structural defects such as delamination or cracks. This results in a highly reliable battery 1.

[0130] The insulating layer 160 may be formed using a material different from that of the solid electrolyte layer 130. For example, the insulating layer 160 may be a coating using aluminum oxide powder. A coating using aluminum oxide powder is formed by applying a paste dispersed in an organic solvent or the like using a doctor blade method or the like. The aluminum oxide powder may have any particle size and any shape, such as a particle size of 0.1 μm or more and 10 μm or less.

[0131] An insulating oxide powder such as aluminum oxide sinks into the current collector foil, which is softer than aluminum oxide, during winding, which has the effect of more strongly integrating the wound body 10. Furthermore, aluminum oxide has high thermal conductivity and excellent heat dissipation performance, which suppresses heat generation in the battery 1 and further improves reliability.

[0132] Instead of forming the insulating layer 160 using aluminum oxide powder, the insulating layer 160 may contain particles with excellent thermal conductivity, such as yttrium oxide, magnesium oxide, silicon nitride, or boron nitride. This provides the same effects as when aluminum oxide is used. Alternatively, the insulating layer 160 may be formed using the same material as the solid electrolyte layer 130 and contain aluminum oxide. In this case, the same anchoring effect and heat dissipation effect can be obtained.

[0133] The insulating layer 160 may also include a polyimide film. The polyimide film can be formed in a state where it protrudes from the edge of the laminate 100, thereby achieving higher insulation. Commercially available polyimide films can be used, and films of any thickness, for example, 10 μm to 90 μm, can be used. The insulating layer 160 may include various insulating films, such as a PET (polyethylene terephthalate) film or a PEN (polyethylene naphthalate) film, instead of or in addition to a polyimide film. These insulating films, such as a polyimide film, are lightweight, and therefore can improve reliability without deteriorating the weight energy density of the battery 1.

[0134] [Cylindrical body] Next, modified examples of cylindrical body 20 will be described with reference to Figs. 6A to 6E. Figs. 6A to 6C are perspective views each showing a schematic configuration of another example of a cylindrical body of battery 1 according to the present embodiment. Figs. 6D and 6E are cross-sectional views each showing a schematic configuration of another example of a cylindrical body of battery 1 according to the present embodiment. In the description of cylindrical bodies 20A to 20E shown in each figure, differences from cylindrical body 20 shown in Fig. 4 will be mainly described, and description of commonalities will be omitted or simplified.

[0135] The cylindrical body 20A shown in FIG. 6A differs from the cylindrical body 20 shown in FIG. 4 in that it has rough surface portions 23 and 24.

[0136] The rough surface portion 23 is provided on the inner surface 21 of the cylindrical body 20A. The rough surface portion 23 is provided on the entire inner surface 21, but is not limited to this. For example, the rough surface portion 23 may be provided only on the portion of the inner surface 21 of the cylindrical body 20A that comes into contact with the laminate 100 and the vicinity thereof.

[0137] The rough surface portion 24 is provided on the inner surface of the slit 22. It is provided on the entire inner surface of the slit 22, but is not limited to this. For example, the rough surface portion 24 may be provided only on the portion of the inner surface of the slit 22 that comes into contact with the laminate 100 and its vicinity.

[0138] The rough surface portions 23 and 24 are formed, for example, by roughening the inner surface 21 of the cylindrical body 20A and the inner surface of the slit 22. Examples of the roughening treatment include physical treatment such as sandblasting, or chemical treatment using acid or chemicals. Alternatively, the roughening treatment may be performed by plating a film made of rough particles. The specific method of roughening is not particularly limited.

[0139] By providing at least one of the rough surface portions 23 and 24, the frictional force between the outer peripheral end portion of the laminate 100 and the cylindrical body 20A can be increased. This can suppress misalignment of the laminate 100. The surface roughness Rz of the rough surface portions 23 and 24 is equal to or less than the thickness of the current collector, for example, but not limited to, 0.3 μm to 30 μm. The surface roughness Rz of the rough surface portions 23 and 24 may be 0.5 μm to 10 μm, or 1 μm to 3 μm. The degree of roughness of the rough surface portions 23 and 24 should be set so as not to damage the laminate 100.

[0140] 6A, the cylindrical body 20B shown in Fig. 6B differs from the cylindrical body 20A shown in Fig. 6A in that it has a resin portion 25 that contacts the laminate 100. Although the cylindrical body 20B does not have a slit 22, it may have a slit 22. If the slit 22 is provided, the resin portion 25 may also be provided inside the slit 22.

[0141] The resin portion 25 is formed, for example, in a layer shape so as to cover the inner surface of the metal tubular material of the cylindrical body 20B. The thickness of the resin portion 25 is, for example, not less than 0.5 μm and not more than 50 μm, but is not limited to this.

[0142] The provision of the resin part 25 can strengthen the contact between the cylindrical body 20B and the laminate 100. In addition, the elasticity of the resin part 25 can absorb the stress of the laminate 100, thereby preventing the laminate 100 from being damaged.

[0143] Furthermore, the resin portion 25 may be formed using a conductive resin material. For example, an epoxy-based thermosetting resin containing metal conductor particles can be used as the conductive resin material. By using a conductive resin material, electrical connection between the cylindrical body 20B and the laminate 100 can be established.

[0144] 6C, when viewed in the axial direction, the size of one end of the cylindrical body 20C in the axial direction is different from the size of the other end of the cylindrical body 20C in the axial direction. Specifically, the cylindrical body 20C has an end 26 that is different in size from the other end.

[0145] By varying the size of the ends of cylindrical body 20C in the axial direction in this way, the directionality of wound body 10 can be clarified, making it easier to control the directionality of wound body 10 during the manufacturing process, improving quality and productivity. Therefore, high-quality batteries 1 can be produced with good productivity.

[0146] In the example shown in Fig. 6C, end 26 is larger than the other end and has a truncated cone shape, but this is not limiting. End 26 may also have a cylindrical shape. End 26 may also be smaller than the other end.

[0147] The cylindrical body 20D shown in FIG. 6D differs from the cylindrical body 20 shown in FIG. 4 in that it includes a step absorbing portion 27. The step absorbing portion 27 is provided to absorb steps in the winding of the laminate 100. Specifically, the step absorbing portion 27 is part of the inner surface of the slit 22 and is a curved surface that is curved along the winding direction of the laminate 100. As shown in FIG. 6D, by arranging the laminate 100 so that it is in contact with the step absorbing portion 27, steps in the winding of the laminate 100 can be absorbed. This reduces stress locally applied to the starting end of the laminate 100 or its vicinity, thereby preventing damage to the laminate 100.

[0148] The cylindrical body 20E shown in FIG. 6E differs from the cylindrical body 20 shown in FIG. 4 in that it includes a step absorbing portion 28. The step absorbing portion 28 is provided to absorb steps that occur during the winding of the laminate 100. Specifically, the step absorbing portion 28 is a protrusion provided on the outer surface of the cylindrical body 20E. The step absorbing portion 28 forms a step corresponding to the thickness of the laminate 100 between the outer surface of the cylindrical body 20E and a portion where the outer peripheral end of the laminate 100 is located. As a result, as shown in FIG. 6E , there is almost no step between the surface of the outer peripheral end of the laminate 100 and the step absorbing portion 28, allowing the second winding of the laminate 100 to be smoothly wound. This reduces stress locally applied to the outer peripheral end of the laminate 100 or its vicinity, thereby preventing damage to the laminate 100.

[0149] As described above, the cylindrical body 20 and the cylindrical bodies 20A to 20E have been described, but the respective features may be combined. For example, the cylindrical body 20 and the cylindrical bodies 20A to 20E may be formed using a porous material. In a shaft made of a porous material, the pore size is, for example, 1 μm to 10 mm, and the porosity is 10% to 90%. By using a porous material, the weight of the cylindrical body can be reduced, and the weight energy density of the battery 1 can be improved.

[0150] [Effects, etc.] Comparing the configuration of battery 1 according to the present embodiment with that of the batteries described in Patent Documents 1 and 2, battery 1 according to the present embodiment differs in that laminate 100 is a wound body wound in the circumferential direction within cylindrical body 20 in contact with inner surface 21. In other words, battery 1 includes cylindrical body 20 having inner surface 21 that contacts and covers the outer surface of wound body 10 in the winding direction, whereas the batteries described in Patent Documents 1 and 2 do not include such a cylindrical body 20.

[0151] For example, the battery disclosed in Patent Document 1 does not include a cylindrical body having an inner surface that contacts and covers the outer surface of the wound body inserted into the exterior material along the winding direction. Therefore, structural defects caused by external impacts on the surface of the easily deformed wound body can easily lead to short circuits and deterioration of characteristics. Furthermore, since there is no contact and fixation effect with the cylindrical body, the wound body is prone to misalignment, miswinding, and loosening of the winding, which can easily cause fluctuations in characteristics.

[0152] Furthermore, the battery disclosed in Patent Document 2 has a structure in which the wound body is immersed in the liquid in the exterior body, but is not fixed to the exterior body. Therefore, there is no contact and fixing effect with the cylindrical body, and the wound body is prone to misalignment, miswinding, and loosening of the winding, which causes problems that lead to fluctuations in characteristics. Another problem is that the battery characteristics depend on pressure fluctuations in the liquid due to temperature changes.

[0153] In contrast, in the battery 1 and its manufacturing method according to the present embodiment, the wound body 10 is in contact with and integrated with the cylindrical body 20, which suppresses structural defects and deterioration of characteristics due to the above-mentioned external impact. This results in a highly reliable battery 1. Furthermore, since the cylindrical body 20 has rigidity, it is easy to protect the wound body 10 from external impact. This makes it possible to realize a more reliable battery 1.

[0154] Furthermore, while the batteries described in Patent Documents 1 and 2 have a constant width of the laminate, the width of the laminate 100 in the battery 1 according to the present embodiment is narrowed toward the inner peripheral end of the winding. This reduces misalignment and deformation during pressure treatment after winding, thereby suppressing short circuits and deterioration of characteristics. This results in a highly reliable battery 1.

[0155] In the battery 1 according to this embodiment, the outer peripheral edge of the laminate 100 is pulled out from the internal space of the cylindrical body 20 through the slit 22 and fixed there. This provides a strong anchoring effect, thereby preventing the outer peripheral edge from shifting in position, shifting in winding, and loosening of the winding. In this way, this embodiment can realize a battery 1 with high performance and high reliability.

[0156] Furthermore, by combining the number of windings with the change in width of the laminate 100 as a capacity design factor, the design range of capacity can be expanded. Furthermore, unlike the laminate type, the lamination process and the pressing process are not repeated, and by continuously winding and pressing the laminate 100 together, a battery 1 with excellent productivity can be realized.

[0157] [Variations] Next, a battery according to a modification of the embodiment will be described. The following description will focus on the differences from the embodiment, and the description of the commonalities will be omitted or simplified.

[0158] <Variation 1> Fig. 7 is a cross-sectional end view showing a schematic configuration of a battery 2 according to a first modification of the embodiment. The battery 2 shown in Fig. 7 differs from the battery 1 shown in Fig. 1 mainly in that the battery 2 does not have a first flange 31 and a second flange 32.

[0159] If the first flange 31 and the second flange 32 were provided to fit the width of the laminate 100, and the laminate 100 included a portion where the width was locally increased, the laminate 100 might not be able to be accommodated between the first flange 31 and the second flange 32, resulting in deformation of the laminate 100. In contrast, the battery 2 according to this modification does not include the first flange 31 and the second flange 32, so deformation of the laminate 100 can be suppressed, and short circuits and deterioration of characteristics can be suppressed. The degree of freedom in the shape of the laminate 100 can also be increased.

[0160] <Variation 2> Fig. 8 is a cross-sectional end view showing a schematic configuration of a battery 3 according to Modification 2 of the embodiment. The battery 3 shown in Fig. 8 differs from the battery 2 shown in Fig. 7 mainly in that it includes a molding member 70.

[0161] The molding member 70 is a member for sealing the wound body 10 together with the cylindrical body 20. The molding member 70 is used as an exterior material. For example, the molding member 70 seals the entire wound body 10 and at least a part of the cylindrical body 20. The molding member 70 is also provided in the internal space of the cylindrical body 20. The molding member 70 is provided in contact with the innermost periphery of the wound body 10. When the first flange 31 and the second flange 32 are provided, the molding member 70 may seal the first flange 31 and the second flange 32. Note that "sealing" means separating the wound body 10 from the external space without exposing the wound body 10 to the outside.

[0162] The molding member 70 exposes at least a portion of each of the first terminal electrode 40 and the second terminal electrode 50. This makes it possible to ensure that the positive electrode and the negative electrode can be removed from the wound body 10.

[0163] The molding member 70 is made of, for example, a thermosetting epoxy resin material. However, other materials can also be used for the molding member 70 as long as it has insulating properties. For example, the wound body 10, which has been heated to a temperature close to its curing temperature (e.g., 120°C), is impregnated with epoxy resin powder having a diameter of 50 μm to 300 μm. This causes the epoxy resin powder to become viscous and adhere to the wound body 10. By repeating this process multiple times, a molding resin layer of, for example, 1 mm to 5 mm is formed to cover the wound body 10. After the molding resin layer of the desired coating thickness is formed, the molding resin layer is allowed to harden for approximately 30 minutes to 1 hour. This produces a battery 3 including a molding member 70 that completely seals the wound body 10. The thus-covered molding member 70 is a laminated film formed by repeatedly applying thin films. Pores or defects (e.g., cracks) present in the single-layer film are blocked by the lamination process, resulting in a highly airtight molding member 70.

[0164] Battery 3 according to this modification can protect wound body 10 from external shock and from outside air containing gas or moisture that may deteriorate the characteristics of wound body 10. This further improves the reliability of battery 3.

[0165] <Variation 3> Fig. 9 is a top view showing a schematic configuration of battery 4 according to a third modification of the embodiment. Battery 4 shown in Fig. 9 differs from battery 1 shown in Fig. 1 mainly in that battery 4 includes cylindrical body 20F and first flange 33 instead of cylindrical body 20 and first flange 31. Specifically, cylindrical body 20F and first flange 33 differ from cylindrical body 20 and first flange 31 in that they are substantially square in plan view. Although not shown in Fig. 9, battery 4 may include a second flange similar to first flange 33 instead of second flange 32.

[0166] The cylindrical body 20F is a cylindrical body having a rectangular cylindrical shape. The corners (ridges) of the cylindrical body 20F are provided with rounded portions. This makes it possible to prevent damage to the laminate 100 wound around the cylindrical body 20F due to stress concentration. Note that C-shaped portions may be provided instead of the rounded portions. Also, the corners of the cylindrical body 20F do not need to be chamfered. For example, the corners may be protected by a relatively soft material such as an insulating film.

[0167] The first flange 33 is a rectangular plate-shaped flange. The corners of the first flange 33 are provided with rounded portions. Note that C-shaped portions may be provided instead of the rounded portions. Also, the corners of the first flange 33 do not necessarily have to be chamfered.

[0168] According to this modification, when multiple batteries 4 are arranged side by side, the volume density is improved. Specifically, when multiple batteries 4 are arranged side by side so that their axial directions are parallel to each other, packing arrangement is facilitated. For example, by arranging multiple batteries 4 side by side and connecting them in parallel, a battery pack with high energy density can be realized.

[0169] The shapes of the cylindrical body 20F and the first flange 33 when viewed in the axial direction are not limited to a square, but may be other regular polygons or polygons such as a regular hexagon or a regular octagon. For example, by using a regular hexagonal cylindrical body 20F and first flange 33, the packing rate when multiple batteries 4 are arranged can be increased.

[0170] <Variation 4> Fig. 10 is a cross-sectional end view showing a schematic configuration of a battery 5 according to Modification 4 of the embodiment. Fig. 11 is a perspective view showing a schematic configuration of a wound body 10 disposed in a cylindrical body 20 according to Modification 4 of the embodiment. Note that Fig. 11 omits the illustration of the cylindrical body 20.

[0171] The battery 5 shown in FIG. 10 differs from the battery 1 shown in FIG. 1 in that it includes a loosening-preventing material 80. The loosening-preventing material 80 prevents loosening of the wound body 10. The loosening-preventing material 80 is a tape-shaped member that secures the innermost periphery of the wound body 10. Specifically, the loosening-preventing material 80 is annularly disposed around the axis of the cylindrical body 20 along the innermost periphery of the wound body 10. For example, the loosening-preventing material 80 is a thermal expansion member that expands when heated. Examples of thermal expansion members that can be used include common materials such as thermal expansion rubber or acrylic resin containing thermal expansion microcapsules. In this modification, as shown in FIGS. 10 and 11, two loosening-preventing materials 80 are arranged to sandwich the center of the wound body 10 in the z-axis direction.

[0172] For example, an annular unexpanded loosening-preventing material 80 is placed along the innermost periphery of the wound body 10, and then heated to a predetermined temperature (e.g., 70°C) to expand the loosening-preventing material 80. As a result, the loosening-preventing material 80 becomes embedded in the innermost periphery of the wound body 10. After the loosening-preventing material 80 and the wound body 10 are integrated, the loosening-preventing material 80, the wound body 10, and the cylindrical body 20 can be firmly fixed together by isostatic pressure.

[0173] In the battery 5 according to this modification, the provision of the loosening-preventing material 80 can further prevent loosening of the wound body 10. Therefore, the reliability of the battery 5 can be improved.

[0174] <Variation 5> Fig. 12 is a perspective view showing a schematic configuration of the wound body 10 arranged inside the cylindrical body 20 according to the fifth modified example of the embodiment. Note that the cylindrical body 20 is not shown in Fig. 12. As shown in Fig. 12, in this modified example, a loosening suppression material 81 is provided instead of the loosening suppression material 80 shown in Fig. 10.

[0175] The slack suppressing material 81 suppresses slack in the wound body 10. The slack suppressing material 81 is a tape-shaped member and fixes the innermost periphery of the wound body 10. For example, the slack suppressing material 81 is an adhesive tape and fixes the innermost periphery of the wound body 10 to the starting end portion of the innermost periphery of the wound body 10.

[0176] The slack suppression material 81 is, for example, a tape-shaped member having a thickness of 5 μm to 50 μm. Any material can be used as the slack suppression material 81, such as polyimide, cellophane, PET, PEN, PPS (polyphenylene sulfide), or Teflon (registered trademark), which has insulating properties. For example, in terms of environmental resistance to thermal cycles, polyimide, which has excellent heat resistance strength, or PEN, which has small thermal expansion, is used.

[0177] According to this modification, the provision of the loosening suppression material 81 can further suppress loosening of the wound body 10. This can improve the reliability of the battery.

[0178] [Battery manufacturing method] Next, a method for manufacturing the batteries according to the above-described embodiment and each of the modifications will be described, taking the method for manufacturing battery 1 as a representative example.

[0179] Fig. 13 is a flowchart showing a method for manufacturing the battery 1 according to the present embodiment. As shown in Fig. 13, the method for manufacturing the battery 1 includes a step (S10) of winding the laminate 100, and a step (S20) of isostatically pressing the wound laminate 100 (i.e., wound body 10) within a cylindrical body 20. Each step will be described in more detail below.

[0180] In the winding step, first, the laminate 100 is prepared. Specifically, slurries are prepared to be used for forming the first active material layer 111, which is the positive electrode active material layer, the second active material layer 121, which is the negative electrode active material layer, the solid electrolyte layer 130, and the insulating layer 160. More specifically, as the solid electrolyte raw material used for the mixture of the first active material layer 111 and the second active material layer 121, for example, a glass powder of Li2S-P2S5-based sulfide having an average particle size of about 1 μm and containing triclinic crystals as the main component is prepared. As this glass powder, for example, 1×10 -3 S / cm or more, 5×10 -3 A soft sulfide-based solid electrolyte having high ionic conductivity of about S / cm or less can be used.

[0181] As the positive electrode active material, for example, a layered Li, Ni, Co, Al composite oxide (LiNi 0.8 Co 0.15 Al 0.05 A mixture containing the above-mentioned positive electrode active material and the above-mentioned solid electrolyte powder is dispersed in an organic solvent or the like to prepare a slurry for a positive electrode active material layer.

[0182] Furthermore, as the negative electrode active material, for example, Li4Ti5O 12 In this way, a negative electrode active material that expands and contracts little during charge and discharge is used. Next, a mixture containing the above-mentioned negative electrode active material and the above-mentioned solid electrolyte powder is dispersed in an organic solvent or the like to prepare a slurry for a negative electrode active material layer in the same manner.

[0183] Next, a Cu foil having a thickness of, for example, 12 μm is prepared as the metal foil to be used for the first current collector 112, which is the positive electrode current collector. A Ni foil having a thickness of, for example, 12 μm is prepared as the metal foil to be used for the second current collector 122, which is the negative electrode current collector. Both main surfaces of each of these current collectors are subjected to, for example, a surface roughening treatment. Roughening both main surfaces improves bonding with the active material or insulating layer, resulting in a highly reliable battery. The degree of surface roughening is not particularly limited, but may be, for example, Rz of about 0.1 μm or more and about 10 μm or less.

[0184] Next, the above-mentioned solid electrolyte powder is dispersed in an organic binder component, an organic solvent, etc. to prepare a slurry for the solid electrolyte layer to be used for the solid electrolyte layer.

[0185] Next, the slurry for the positive electrode active material layer is applied to a thickness of approximately 50 μm on the first current collector 112 by a doctor blade method, and then air-dried to form a first active material layer 111 (positive electrode active material layer) to a thickness of approximately 30 μm on the first current collector 112. Thereafter, similarly, the paste for the solid electrolyte layer is applied to a thickness of approximately 40 μm on the first active material layer 111 and air-dried to form a solid electrolyte layer 130 to a thickness of approximately 25 μm. Thereafter, the paste for the negative electrode active material layer is applied to a thickness of approximately 50 μm on the solid electrolyte layer 130 and air-dried to form a second active material layer 121 (negative electrode active material layer) to a thickness of approximately 30 μm. Next, the slurry for the solid electrolyte layer for the insulating layer is applied to one side of the second current collector 122 to a thickness of approximately 10 μm, and then air-dried to form an insulating layer 160 to a thickness of approximately 6 μm.

[0186] Then, the second current collector 122 is placed on the second active material layer 121, and the second active material layer 121 and the second current collector 122 are pressed together using a roll press with a linear pressure of approximately 2 t / cm. This produces a long laminate 100. The shapes of the laminates 100A to 100F described with reference to FIGS. 5A to 5F can be formed by cutting or otherwise processing a portion of the end of the laminate 100 into a predetermined shape. Alternatively, current collectors having the shapes of the laminates 100A to 100F may be prepared in advance as the first current collector 112 and the second current collector 122. Furthermore, in the coating process for forming the insulating layer 160, it is not necessary to coat the end of the laminate 100 corresponding to the outermost periphery of the wound body 10. This allows for the formation of a configuration in which the insulating layer 160 is not present in the outermost periphery.

[0187] Next, the laminate 100 manufactured as described above is wound and then inserted into the internal space of the cylindrical body 20, as shown in Fig. 14A. Fig. 14A, Fig. 14B, and Fig. 14C are all perspective views for explaining one step of the manufacturing method of the battery according to the embodiment and each of the modified examples.

[0188] Next, as shown in Fig. 14B, the outer peripheral end of the wound laminate 100 is pulled out through the slit 22. Then, as shown in Fig. 14C, an epoxy-based thermosetting insulating resin is applied to the outer peripheral end of the laminate 100 pulled out through the slit 22, for example, using a dispenser, and is thermally cured by heating at approximately 120°C. This forms a resin member 60, which fixes and integrates the cylindrical body 20 and the outer peripheral end of the laminate 100.

[0189] In this case, the inner surface 21 and outer surface of the cylindrical body 20, as well as the inner surfaces of the slits 22, may be roughened. In this case, the roughening increases the surface area, thereby increasing the bonding surface between the cylindrical body 20 and the laminate 100 and the resin member 60, thereby firmly bonding them. The degree of roughening is not particularly limited, but for example, by making the roughening equal to or less than the thickness of the current collector, a strong anchor effect can be obtained while suppressing damage to the current collector. The degree of roughening of the inner surface 21 and the outer surface of the cylindrical body 20 may be different or the same. When using a cylindrical body without slits 22, such as the cylindrical body 20B shown in FIG. 6B, the outer peripheral end of the laminate 100 can be fixed to the inner surface 21 of the cylindrical body 20.

[0190] A slack suppressing material 80 or 81 may be attached to the wound body 10 arranged inside the cylindrical body 20. When using a slack suppressing material 80 that is a thermal expansion member, it is expanded by heating. This allows the wound laminate 100, i.e., the wound body 10 and the cylindrical body 20, to be firmly fixed together. The slack suppressing material 80 or 81 may be attached before or after inserting the wound body 10 into the cylindrical body 20.

[0191] After the wound body 10 is placed inside the cylindrical body 20, isostatic pressing is performed as shown in FIG. 13. The isostatic pressing is warm isotropic pressing (WIP). For example, the WIP temperature is 70°C and the pressure is 400 MPa, but this is not limited thereto. Alternatively, the isostatic pressing may be cold isostatic pressing (CIP). The pressure is about 3 t / cm, but this is not limited thereto.

[0192] Furthermore, for example, isostatic pressing may be performed after at least a portion of the innermost periphery of the wound laminate 100 is covered with an elastic body. The elastic body is, for example, a soft, tubular member made of silicone rubber.

[0193] Next, the first terminal electrode 40 and the second terminal electrode 50 made of SUS are attached to the cylindrical body 20 and the second current collector 122 at the innermost periphery of the laminate 100 using an Ag-based thermosetting conductive resin. This completes the manufacture of the battery 1 shown in FIG.

[0194] After this, a thermosetting epoxy resin may be applied to a thickness of approximately 300 μm, taking care not to apply the resin to the exposed portions of the first terminal electrode 40 and the second terminal electrode 50. The resin is then thermally cured by heating to approximately 120°C in an inert gas such as nitrogen (N2) gas. This allows the molding member 70 to be formed as in the battery 3 shown in FIG. 8.

[0195] The above manufacturing method is merely an example, and the processing in each step can be changed as appropriate.

[0196] For example, the laminate 100 may be wound within the internal space of the cylindrical body 20. For example, the laminate 100 may be wound while inserting an end of the laminate 100 into the internal space of the cylindrical body 20 through a slit 22 shown in FIG. 4 . The end inserted into the slit 22 becomes the inner peripheral end of the laminate 100. To stabilize the winding of the laminate 100, a thin rod-shaped or cylindrical support member serving as a central axis of the winding may be inserted axially into the internal space of the cylindrical body 20. After winding the laminate 100, the support member may be withdrawn in the axial direction. Alternatively, the cylindrical support member may be used as an elastic member for protection against isostatic pressure application, and the support member may be withdrawn after pressure application. Alternatively, a thermal expansion member may be used as the cylindrical support member, or it may be used as a loosening prevention material.

[0197] (Other embodiments) While the battery according to the present disclosure has been described above based on the embodiments, the present disclosure is not limited to these embodiments. As long as they do not deviate from the gist of the present disclosure, various modifications conceivable by those skilled in the art to the embodiments and other forms constructed by combining some of the components of the embodiments are also included in the scope of the present disclosure.

[0198] For example, the width may be larger at the inner circumferential end of the winding of the laminate. That is, the first portion P1 having a smaller width may be located closer to the outer circumferential end than the inner circumferential end of the winding of the laminate. Also, for example, the width of the inner circumferential end and the width of the outer circumferential end of the laminate may be the same. The width of the laminate may be uniform along the winding direction.

[0199] Furthermore, the above-described embodiments can be modified, substituted, added, omitted, and the like in various ways within the scope of the claims or their equivalents. [Industrial Applicability]

[0200] The battery according to the present disclosure can be used, for example, as a secondary battery such as an all-solid-state battery used in various electronic devices or automobiles. [Explanation of symbols]

[0201] 1, 2, 3, 4, 5 batteries 10. Wound body 20, 20A, 20B, 20C, 20D, 20E, 20F Cylindrical body 21 Inner surface 22 Slit 23, 24 Rough surface area 25 Resin part 26 End 27, 28 Step absorption section 31, 33 First Tsuba 32 Second Tsuba 40 1st terminal electrode 50 2nd terminal electrode 60 Resin parts 70 Molded parts 80, 81 Loosening prevention material 100, 100A, 100B, 100C, 100D, 100E, 100F laminate 101A, 101B, 101C, 101D Narrow part 102D First narrow section 103D 2nd narrow part 104c C processing section 104r R processing section 110 1st electrode layer 111 First active material layer 112 First current collector 120 Second electrode layer 121 Second active material layer 122 Second current collector 130 Solid electrolyte layer 160 Insulating Layer

Claims

1. a laminate including a first electrode layer, a second electrode layer, and a solid electrolyte layer located between the first electrode layer and the second electrode layer; a cylindrical body; The laminate is a wound body wound in contact with the inner surface of the cylindrical body along the circumferential direction within the cylindrical body. battery.

2. When the length of the stack in the axial direction of the cylindrical body is defined as the width of the stack, the width of the stack at a first portion is shorter than the width of the stack at a second portion, The first portion is located closer to an inner peripheral end of the winding than the second portion. The battery of claim 1 .

3. The width of the laminate decreases continuously from the second portion to the first portion. The battery of claim 2.

4. The width of the laminate decreases stepwise from the second portion to the first portion. The battery of claim 2.

5. the first portion and the second portion are located at the innermost periphery of the wound body. The battery of claim 2.

6. A loosening suppression material that suppresses loosening of the wound body is provided. The battery of any one of claims 1 to 5.

7. The slack suppression material is a tape-shaped member. The battery of claim 6.

8. the tape-shaped member fixes the inner peripheral end of the wound body; The battery of claim 7.

9. the tape-shaped member is provided in a ring shape around the axis of the cylindrical body and along the innermost periphery of the wound body; The battery of claim 7.

10. the tape-shaped member is embedded in the innermost periphery of the wound body; 10. The battery of claim 9.

11. The tape-shaped member is a thermal expansion member. The battery of claim 7.

12. The laminate has a chamfered shape on at least one of an inner peripheral end portion and an outer peripheral end portion of the winding. The battery of any one of claims 1 to 5.

13. The length of the cylindrical body in the axial direction is longer than the width of the laminate at the second portion. The battery according to any one of claims 2 to 5.

14. The cylindrical body includes a conductor. The battery of any one of claims 1 to 5.

15. The cylindrical body includes a porous member. The battery of any one of claims 1 to 5.

16. When viewed from the axial direction of the cylindrical body, the size of one end of the cylindrical body in the axial direction is different from the size of the other end of the cylindrical body in the axial direction. The battery of any one of claims 1 to 5.

17. The cylindrical body has a rough surface on its inner surface. The battery of any one of claims 1 to 5.

18. The cylindrical body has a resin portion that contacts the laminate. The battery of any one of claims 1 to 5.

19. A flange is provided so as to protrude inward from the cylindrical body. The battery of any one of claims 1 to 5.

20. The cylindrical body has a recess into which the laminate is inserted. The battery of any one of claims 1 to 5.

21. The cylindrical body has a rough surface on the inner surface of the recess.

21. The battery of claim 20.

22. a resin member covering the inner surface of the recess; 21. The battery of claim 20.

23. The cylindrical body has a step absorbing portion that absorbs steps in the winding of the laminate. The battery of any one of claims 1 to 5.

24. a step of winding a laminate including a first electrode layer, a second electrode layer, and a solid electrolyte layer located between the first electrode layer and the second electrode layer; and isostatically pressing the wound laminate in a cylindrical body. How batteries are manufactured.

25. The isostatic pressing step is carried out after covering at least a part of the innermost periphery of the wound laminate with an elastic body. A method for manufacturing the battery of claim 24.

Images