Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/04—Hybrid capacitors
  • H01G11/06—Hybrid capacitors with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/22—Electrodes
  • H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/78—Cases; Housings; Encapsulations; Mountings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/04—Construction or manufacture in general
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
  • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
  • H01M50/105—Pouches or flexible bags
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/147—Lids or covers
  • H01M50/148—Lids or covers characterised by their shape
  • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries

Definitions

• a process may be performed in which the exterior film is wrapped around the outer peripheral surfaces of the electrode body and the lid body, for example, and then the exterior film is joined to the outer peripheral surface of the lid body.
• the exterior film In this wrapped state of the exterior film, if there is a gap between the exterior film and the lid body, poor bonding between the exterior film and the lid body occurs, and repair work for the poor bonding part may be required after the fact, which is undesirable.
• the exterior film has elasticity, it is difficult to realize a wrapped state without sagging the exterior film against the outer peripheral surface of the lid body.
• the present invention aims to provide an electricity storage device that appropriately prevents poor bonding between the exterior film and the lid, an electricity storage device manufacturing kit, and a method for manufacturing an electricity storage device.
• the energy storage device is an energy storage device comprising an electrode body and an exterior body sealing the electrode body, the electrode body comprising a first end, a second end spaced apart from the first end, and an intermediate portion extending continuously between the first end and the second end.
• the exterior body comprises an exterior film encasing the intermediate portion, and a lid body disposed on at least one of the first end side and the second end side, the lid body having a bonding surface bonded to the exterior film.
• the outer periphery of the intermediate portion is smaller than the outer periphery of the bonding surface.
• the electric storage device manufacturing kit is an electric storage device manufacturing kit for manufacturing an electric storage device including an electrode body and an exterior body that seals the electrode body, the electrode body including a first end, a second end that is disposed apart from the first end, and an intermediate portion that extends continuously between the first end and the second end.
• the exterior body includes an exterior film for wrapping the intermediate portion, and a lid body for disposing on at least one of the first end side and the second end side, the lid body having a bonding surface to be bonded to the exterior film.
• the outer periphery of the intermediate portion is smaller than the outer periphery of the bonding surface.
• the electricity storage device manufacturing kit according to the fifth aspect of the present invention is the electricity storage device manufacturing kit according to the fourth aspect, in which the difference between the outer periphery of the intermediate portion and the outer periphery of the joint surface is 1 mm or more.
• the electricity storage device manufacturing kit according to the sixth aspect of the present invention is the electricity storage device manufacturing kit according to the fourth or fifth aspect, in which the intermediate portion has one or more corners on which a rounded surface is formed, and the joining surface has one or more corners on which a rounded surface is formed.
• the radius of curvature of the one or more corners of the intermediate portion is larger than the radius of curvature of the one or more corners of the joining surface.
• the seventh aspect of the present invention relates to an intermediate body for an electric storage device for manufacturing an electric storage device
• an electrode body and an exterior body sealing the electrode body comprising an electrode body and an exterior body sealing the electrode body, the electrode body comprising a first end, a second end spaced apart from the first end, and an intermediate portion extending continuously between the first end and the second end.
• the exterior body comprises an exterior film enveloping the intermediate portion, and a lid body disposed on at least one of the first end side and the second end side, the lid body having a joining surface joined to the exterior film.
• the intermediate body for the electric storage device comprises the electrode body, and the exterior film and the lid body joined to each other so as to house the electrode body, the outer periphery of the intermediate portion being smaller than the outer periphery of the joining surface.
• the intermediate body for the electric storage device does not contain an electrolyte.
• a manufacturing method for an electricity storage device is a manufacturing method for an electricity storage device including an electrode body and an exterior body sealing the electrode body, the electrode body including a first end portion, a second end portion spaced apart from the first end portion, and an intermediate portion extending continuously between the first end portion and the second end portion, and the exterior body including an exterior film and a lid body having a bonding surface to be bonded to the exterior film.
• the manufacturing method includes the following. The lid body and the electrode body are arranged so that the lid body is located on at least one of the first end side and the second end side.
• the exterior film is wrapped around the lid body and the electrode body so as to cover the joint surface of the lid body and the middle portion of the electrode body, and the joint surface and the exterior film are joined to create an intermediate body of an electricity storage device in which the electrode body is contained between the lid body and the exterior film, and which does not contain an electrolyte.
• the outer periphery of the intermediate portion is smaller than the outer periphery of the joint surface.
• a manufacturing method for an electricity storage device is a manufacturing method for an electricity storage device comprising an electrode body and an exterior body sealing the electrode body, the electrode body comprising a first end portion, a second end portion spaced apart from the first end portion, and an intermediate portion extending continuously between the first end portion and the second end portion, and the exterior body comprising an exterior film and a lid body having a bonding surface to be bonded to the exterior film.
• the manufacturing method includes the following.
• the lid body and the electrode body are arranged so that the lid body is located on at least one of the first end side and the second end side.
• the exterior film is wrapped around the lid body and the electrode body so as to cover the joint surface of the lid body and the middle portion of the electrode body.
• wrapping the exterior film around the lid body and the electrode body includes wrapping the exterior film around the lid body and the electrode body so that the pressure applied from the exterior film to the joint surface is greater than the pressure applied from the exterior film to the intermediate portion.
• the electricity storage device, the electricity storage device manufacturing kit, and the electricity storage device manufacturing method according to the present invention can prevent poor bonding between the exterior film and the lid without adversely affecting the electrode body.
• FIG. 1 is a perspective view of an electricity storage device according to an embodiment.
• FIG. 2 is a perspective view of an electrode body included in the electricity storage device of FIG. 1 .
• 2 is a cross-sectional view showing a layer structure of an exterior film included in the electricity storage device of FIG. 1 .
• FIG. 2 is a perspective view of a lid provided in the electricity storage device of FIG. 1 .
• 4A to 4C are diagrams illustrating a method for identifying the outer periphery of the joint surface of the power storage device in FIG. 1 .
• 5A to 5C are diagrams illustrating an example of a manufacturing process for an electricity storage device using an electricity storage device manufacturing kit according to an embodiment. 4 is a flowchart showing an example of a method for manufacturing the electricity storage device of FIG.
• FIG. 13A and 13B are diagrams for explaining the relationship in size between the outer periphery of the joint surface and the outer periphery of the intermediate portion.
• 4 is a top view of an intermediate electricity storage device produced by a method for producing an electricity storage device.
• FIG. 13A and 13B are diagrams illustrating the configuration of a lid body and an electrode body according to a modified example.
• 13A and 13B are diagrams illustrating the configuration of a lid body and an electrode body according to another modified example.
• 13 is a cross-sectional view that illustrates a schematic diagram of a wound electrode body housed in an exterior body of an electricity storage device according to a modified example.
• the front surface 21 and the back surface 22 respectively constitute the first end 201 and the second end 202 of the electrode body 20 arranged apart from each other in the FB direction. Additionally, the upper surface 23, the lower surface 24, the first side surface 25, and the second side surface 26 constitute an intermediate portion 203 of the electrode body 20 that extends continuously between the first end portion 201 and the second end portion 202.
• the first end portion 201 may include an element that protrudes from the front surface 21 toward the lid body 60A (in the direction of the arrow F).
• the second end portion 202 may include an element that protrudes from the back surface 22 toward the lid body 60B (in the direction of the arrow B).
• the electrode body 20 has corners 20A, 20B, 20C, and 20D. Corner 20A is formed at the boundary between the top surface 23 and the first side surface 25. Corner 20B is formed at the boundary between the top surface 23 and the second side surface 26. Corner 20C is formed at the boundary between the first side surface 25 and the bottom surface 24. Corner 20D is formed at the boundary between the second side surface 26 and the bottom surface 24. At least one of corners 20A to 20D may have a rounded surface. An example in which corners 20A to 20D have rounded surfaces will be described later.
• the outer periphery of the intermediate portion 203 is designated as L1, L1'.
• the outer periphery L1 is the outer periphery of the intermediate portion 203 of the electrode body 20 constituting the electricity storage device manufacturing kit 100 or the electricity storage device intermediate 10A.
• the electricity storage device manufacturing kit 100 see Figure 6
• the electricity storage device intermediate 10A see Figure 9
• the outer periphery L1' is the outer periphery of the intermediate portion 203 of the electrode body 20 constituting the electricity storage device 10. More specifically, the outer periphery L1, L1' is the length of the outer periphery of the intermediate portion 203 in a plane that passes halfway between the front surface 21 and the back surface 22 and is perpendicular to the FB direction.
• the outer circumferences L1 and L1' are measured with a tape measure conforming to JIS B 7522:2018 Class 1, at a tension indicated on a portion of the tape measure, at an ambient temperature of 20°C ⁇ 2°C (note that for tape measures without tension indication, the tension is 5N for nominal dimensions of 2m or less, and 50N for widths of 50mm or more).
• the outer circumference L1 is smaller than the outer circumference L2 of the joint surface 63 of the lid body 60 before the energy storage device 10 is constructed and in a state where it is not joined to the exterior film 50. That is, in the energy storage device manufacturing kit 100 described below, L1 ⁇ L2 holds.
• the outer circumference L1 is smaller than the outer circumference L3 of the joint surface 63 of the lid body 60 before the energy storage device 10 is constructed and in a state where it is joined to the exterior film 50. That is, in the intermediate body 10A of the energy storage device 10 described below, L1 ⁇ L3 holds. Furthermore, for an electricity storage device in which the outer perimeter L1' is smaller than the outer perimeter L3 of the joint surface of the lid body 60 that constitutes the electricity storage device, i.e., L1' ⁇ L3, L1 ⁇ L2 holds in the electricity storage device manufacturing kit for manufacturing the electricity storage device, or L1 ⁇ L3 holds in the intermediate body of the electricity storage device.
• an electricity storage device for which L1' ⁇ L3 is satisfied is included within the scope of the present invention.
• an electricity storage device manufacturing kit 100 for which L1 ⁇ L2 is satisfied is used, even if an electricity storage device 10 manufactured using the kit is satisfied and L1' ⁇ L3 is satisfied, or even if an electricity storage device intermediate 10A manufactured using the electricity storage device manufacturing kit 100 is satisfied and L1 ⁇ L3 is satisfied, the scope of the present invention is included.
• an electricity storage device intermediate 10A for which L1 ⁇ L3 is used is used, even if an electricity storage device 10 manufactured via the electricity storage device intermediate 10A is satisfied and L1' ⁇ L3 is satisfied, the scope of the present invention is included.
• the aluminum alloy foil is more preferably a hard aluminum alloy foil made of, for example, a work-hardened aluminum alloy.
• the hard aluminum alloy foil include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-H18, JIS H4160:1994 A8079H-H18, JIS H4000:2014 A8021P-H14, or JIS H4000:2014 A8079P-H14.
• the aluminum alloy foil is preferably an aluminum alloy foil containing magnesium.
• the magnesium content is preferably 0.2 to 5.6% by mass, and more preferably 0.2 to 3.0% by mass.
• Examples of aluminum alloy foils containing magnesium include aluminum alloy foils having compositions specified in JIS H4000:2017 A5005P-O, JIS H4000:2017 A5050P-O, and JIS H4000:2017 A5052P-O.
• stainless steel foil examples include austenitic, ferritic, austenitic-ferritic, martensitic, and precipitation hardened stainless steel foils. From the viewpoint of providing an exterior film 50 with excellent formability, it is preferable that the stainless steel foil is made of austenitic stainless steel.
• austenitic stainless steels that make up the stainless steel foil include SUS304, SUS301, and SUS316L, with SUS304 being particularly preferred.
• the thickness of the barrier layer 52 should be such that it at least functions as a barrier layer to prevent the penetration of moisture, and may be, for example, about 5 to 1000 ⁇ m.
• the thickness of the barrier layer 52 is preferably about 85 ⁇ m or less, more preferably about 50 ⁇ m or less, even more preferably about 40 ⁇ m or less, and particularly preferably about 35 ⁇ m or less.
• the thickness of the barrier layer 52 is preferably about 9.0 ⁇ m or more, more preferably about 20 ⁇ m or more, and more preferably about 25 ⁇ m or more.
• preferred ranges of the thickness of the barrier layer 52 include about 9.0 to 1000 ⁇ m, about 9.0 to 1000 ⁇ m, about 9.0 to 1000 ⁇ m, about 9.0 to 1000 ⁇ m, about 9.0 to 85 ⁇ m, about 9.0 to 50 ⁇ m, about 9.0 to 40 ⁇ m, about 9.0 to 35 ⁇ m, about 20 to 85 ⁇ m, about 20 to 50 ⁇ m, about 20 to 40 ⁇ m, about 20 to 35 ⁇ m, about 25 to 85 ⁇ m, about 25 to 50 ⁇ m, about 25 to 40 ⁇ m, and about 25 to 35 ⁇ m.
• the barrier layer 52 is made of an aluminum alloy foil, the above-mentioned ranges are particularly preferred.
• the thickness of the barrier layer 52 is preferably about 35 ⁇ m or more, more preferably about 45 ⁇ m or more, even more preferably about 50 ⁇ m or more, and even more preferably about 55 ⁇ m or more, and is preferably about 200 ⁇ m or less, more preferably about 85 ⁇ m or less, even more preferably about 75 ⁇ m or less, and even more preferably about 70 ⁇ m or less.
• the preferable ranges are about 35 to 200 ⁇ m, about 35 to 85 ⁇ m, about 35 to 75 ⁇ m, about 35 to 70 ⁇ m, about 45 to 200 ⁇ m, about 45 to 85 ⁇ m, about 45 to 75 ⁇ m, about 45 to 70 ⁇ m, about 50 to 200 ⁇ m, about 50 to 85 ⁇ m, about 50 to 75 ⁇ m, about 50 to 70 ⁇ m, about 55 to 200 ⁇ m, about 55 to 85 ⁇ m, about 55 to 75 ⁇ m, and about 55 to 70 ⁇ m.
• the exterior film 50 has high formability, which makes deep drawing easy and can contribute to increasing the capacity of the electricity storage device.
• the thickness of the stainless steel foil is preferably about 60 ⁇ m or less, more preferably about 50 ⁇ m or less, even more preferably about 40 ⁇ m or less, even more preferably about 30 ⁇ m or less, and particularly preferably about 25 ⁇ m or less.
• the thickness of the stainless steel foil is preferably about 10 ⁇ m or more, more preferably about 15 ⁇ m or more.
• Preferred ranges for the thickness of the stainless steel foil include about 10 to 60 ⁇ m, about 10 to 50 ⁇ m, about 10 to 40 ⁇ m, about 10 to 30 ⁇ m, about 10 to 25 ⁇ m, about 15 to 60 ⁇ m, about 15 to 50 ⁇ m, about 15 to 40 ⁇ m, about 15 to 30 ⁇ m, and about 15 to 25 ⁇ m.
• the barrier layer 52 when the barrier layer 52 is an aluminum foil, it is preferable that at least the surface opposite to the base layer 51 is provided with a corrosion-resistant film in order to prevent dissolution and corrosion.
• the barrier layer 52 may be provided with a corrosion-resistant film on both sides.
• the corrosion-resistant film refers to a thin film that is provided with corrosion resistance (e.g., acid resistance, alkali resistance, etc.) on the barrier layer 52 by performing, for example, hydrothermal conversion treatment such as boehmite treatment, chemical conversion treatment, anodizing treatment, plating treatment such as nickel or chromium, or corrosion prevention treatment by applying a coating agent on the surface of the barrier layer 52.
• the lid body 60 When the lid body 60 is plate-shaped, it is preferable that the lid body 60 has a certain degree of thickness so that deformation of the exterior body 40 is suppressed even when the power storage device 10 is arranged on top of each other. From another perspective, when the lid body 60 is plate-shaped, it is preferable that the joint surface 63 of the lid body 60 has a certain degree of thickness so that the joint surface 63 of the lid body 60 and the exterior film 50 can be suitably heat-sealed when forming the second sealing portion 80 described later.
• the minimum value of the thickness of the lid body 60 is, for example, 1.0 mm, more preferably 3.0 mm, and even more preferably 4.0 mm.
• the outer periphery of the bonding surface 63 is L2.
• the outer periphery L2 is the outer periphery of the bonding surface 63 when not bonded to the exterior film 50.
• the outer periphery L2 is determined by converting the pixels corresponding to the outline of the lid body 60A or lid body 60B determined in step (V) into actual dimensions based on the image data of the lid body 60A or lid body 60B alone taken under conditions (I) to (IV), which will be described in the measurement of the outer periphery L3 below.
• the outer periphery L2 of the bonding surface 63 is larger than the outer periphery L1 of the electrode body 20. It is preferable that the difference between the outer periphery L2 and the outer periphery L1 is 1 mm or more.
• the lid body 60 constitutes the electricity storage device 10 or constitutes the intermediate body 10A of the electricity storage device, and the outer periphery of the joint surface 63 in a state in which the joint surface 63 is joined to the exterior film 50 is L3.
• the difference between the outer periphery L3 and the outer periphery L1' is preferably 1 mm or more.
• the outer periphery L3 of the joint surface 63 of the lid body 60A and the lid body 60B is larger than the outer periphery L1 of the electrode body 20.
• the difference between the outer periphery L3 and the outer periphery L1 is preferably 1 mm or more.
• the outer periphery L3 is specified by specifying the number of pixels corresponding to the outer periphery of the second surface 62 of the lid body 60A or the lid body 60B in the image data in which the entire lid body 60A or the lid body 60B is captured, and converting the number of pixels into actual size. It is assumed that the correspondence between the pixels of the image data and the actual length is specified in advance.
• the conditions for acquiring the image data are as follows.
• (I) The power storage device 10 or the intermediate body 10A of the power storage device is placed on a horizontal plane so that the lower surface 42 of the power storage device 10 faces downward, or the surface of the intermediate body 10A of the power storage device corresponding to the lower surface 42 faces downward, and the second surface 62 of the cover body 60A or the cover body 60B faces the lens of the digital camera and is perpendicular to the optical axis of the lens.
• the digital camera used is, for example, a WG-40 manufactured by RICHO, which has an autofocus function, uses a CMOS as an imaging element, and has an optical zoom of 5x or more.
• the background during imaging is a solid color that is not similar to the color of the electricity storage device 10 including the lid 60 or the intermediate body 10A of the electricity storage device. Imaging is performed using the autofocus function of the digital camera.
• the number of pixels of image data output from the image sensor of the digital camera is 4608 x 3456 (pixels), and the number of recorded pixels is the same.
• the number of pixels corresponding to the lid body 60A or the lid body 60B is 30% or more.
• the outer periphery L3 is specified based on the image data in the following manner.
• V From the image data, the contour of the end face of the power storage device 10 or the intermediate body 10A of the power storage device in a plane perpendicular to the FB direction is extracted. The contour is extracted using image processing software ImageJ (National Institutes of Health). First, a noise removal process is performed on the image data. Next, the contour of the end face of the power storage device 10 or the intermediate body 10A of the power storage device is detected by edge detection.
• Pixels corresponding to the exterior film 50 are excluded from the area surrounded by the extracted contour.
• the exterior film 50 forms the first sealing portion 70 in the power storage device 10.
• the first sealing portion 70 is a portion formed by joining the edges of the exterior film 50.
• the lid body 60 connected to the positive electrode is preferably made of aluminum or an aluminum alloy.
• the lid body 60 connected to the negative electrode is preferably made of nickel, copper, or a copper alloy.
• the material constituting the lid body 60 connected to the negative electrode may be copper plated with nickel.
• the material constituting the lid body 60 may include recycled metal materials.
• step S11 the manufacturing equipment joins each of the pair of lid bodies 60 to each of the two electrode terminals 30. Completion of the first process creates a pair of lid units in which the electrode terminals 30 are joined to the lid bodies 60.
• the third step (lid unit arrangement step) of step S13 is performed in parallel with the second step or after the second step.
• the manufacturing apparatus arranges the pair of lid units created in step S11 on the first end 201 side and the second end 202 side of the electrode body 20, respectively, and joins the electrode terminal 30 and the electrode body 20.
• the exterior film 50, the electrode body 20, and the pair of lid units are in a state as shown in FIG. 6.
• the exterior film 50 may be provided with a mark for properly aligning the pair of lid units with respect to the exterior film 50.
• the restricting means may be a device that applies an external force to the electrode body 20 and the pair of lid bodies 60 so as to prevent the electrode body 20 and the pair of lid bodies 60 from moving.
• the regulating means may be a device that applies a force to the electrode body 20 and the lid body 60 in a direction opposite to the direction in which the exterior film 50 is pulled.
• the regulating means may include a roller that runs on the exterior film 50 while the exterior film 50 is being pulled in order to remove wrinkles in the exterior film 50.
• the procedure for realizing the wound state in the winding process is not limited to the above-mentioned winding.
• the electrode body 20 may be accommodated inside the exterior film 50 rolled into a cylindrical shape, or the exterior film 50 that has been rolled into a cylindrical shape and at least a part of which has been temporarily fixed so as to maintain that state, and then the lid body 60 may be placed in each of the pair of openings, and then tension may be applied to the exterior film 50.
• the electrode body 20 may be accommodated inside the exterior film 50 rolled into a cylindrical shape, or the exterior film 50 that has been rolled into a cylindrical shape and at least a part of which has been temporarily fixed so as to maintain that state, and then tension may be applied to the exterior film 50.
• the outer periphery L1 of the intermediate portion 203 is smaller than the outer periphery L2 of the joint surface 63. Therefore, in the fourth step, the pressure from the tensioned exterior film 50 is mainly applied to the pair of lid bodies 60, but is not applied or is barely applied to the electrode body 20. Therefore, when the fourth step is completed, the joint surface 63, intermediate portion 203 and exterior film 50 have a relationship as shown in Figure 8, and the pressure applied from the exterior film 50 to the intermediate portion 203 is smaller than the pressure applied from the exterior film 50 to the joint surface 63. Note that Figure 8 is exaggerated for ease of explanation and does not necessarily reflect the actual dimensions.
• the fifth step (first sealing step) of step S15 is performed after the fourth step.
• the manufacturing equipment forms a first sealing portion (hereinafter referred to as a "temporary first sealing portion") having an unsealed portion for injecting an electrolyte solution.
• the temporary first sealing portion the heat-sealable resin layers 53 of the exterior film 50 facing each other are joined together. Note that if the power storage device 10 is, for example, an all-solid-state battery, the step of injecting an electrolyte solution is not necessary, and therefore in the fifth step, the manufacturing equipment forms the first sealing portion 70.
• the sixth step (second sealing step) of step S16 is performed after the fifth step.
• the manufacturing device forms the second sealing portion 80 by bonding the heat-sealable resin layer 53 constituting the inner surface of the exterior film 50 to the bonding surfaces 63 of the pair of lid bodies 60 facing it.
• the bonding between the heat-sealable resin layer 53 and the bonding surfaces 63 is performed by heat sealing.
• the above bonding may be performed by ultrasonic sealing, high-frequency sealing, or bonding with an adhesive in addition to or instead of this.
• an intermediate body 10A see FIG.
• the electric storage device is created in which the electrode body 20 is housed between the pair of lid bodies 60 and the exterior film 50 in a state where they are bonded to each other.
• the intermediate body 10A of the electric storage device does not contain an electrolyte.
• the outer periphery L1 of the intermediate portion 203 is smaller than the outer periphery L3 of the bonding surfaces 63. This avoids undesirable effects such as unnecessary pressure being applied to the electrode body 20 and the collapse of the layered structure of the electrode body 20, even in the intermediate body 10A of the energy storage device.
• step S17 electrolyte injection step
• the manufacturing device injects the electrolyte through the unsealed portion formed in the temporary first sealing portion.
• the eighth step (first sealing portion forming step) of step S18 is performed after the seventh step.
• the manufacturing equipment forms the first sealing portion 70 by heat sealing a portion of the temporary first sealing portion, including the unsealed portion. Note that, if the power storage device 10 is, for example, an all-solid-state battery, the seventh and eighth steps are omitted.
• the exterior film 50 can be wrapped around the pair of lid bodies 60 without any gaps, while it is possible to avoid situations such as the collapse of the laminated structure of the electrode body 20 due to unnecessary pressure on the electrode body 20.
• a poor joint in this embodiment, a poor seal of the second sealing portion 80
• wrinkles and the like of the second sealing portion 80 are prevented, and sufficient seal strength is ensured.
• the above-mentioned effects can be achieved without significantly changing the tension (tensile force) during the wrapping process of the exterior film 50.
• the verification that the pressure applied from the exterior film 50 to the intermediate portion 203 is smaller than the pressure applied from the exterior film 50 to the joint surface 63 can be performed by the following method.
• a first step two electrode terminals 30 are respectively joined to each of the pair of lid bodies 60 of the energy storage device manufacturing kit 100 to create a pair of lid units.
• the electrode body 20 and the pair of lid units are arranged on the exterior film 50 so that the lid units are located on the first end 201 side and the second end 202 side, respectively. Furthermore, the electrode body 20 and the two electrode terminals 30 are joined.
• a pressure-sensitive sheet is arranged so as to cover the entire joint surface 63 of the electrode body 20 and the pair of lid bodies from above.
• the exterior film 50 and the pressure-sensitive sheet are wrapped around the electrode body 20 and the pair of lid units while restricting their movement. At this time, tension is applied to the exterior film 50 and the pressure-sensitive sheet so that they do not shift. After wrapping the exterior film 50 and the pressure-sensitive sheet around the entire circumference of the intermediate portion 203 and the joint surface 63 in this manner, the exterior film 50 and the pressure-sensitive sheet are spread out, and the pressure distribution recorded by the pressure-sensitive sheet is verified.
• the pressure distribution is verified using analysis software that visualizes the pressure of the pressure-sensitive sheet when the exterior film 50 and the pressure-sensitive sheet are wrapped around it. In this case, if there is an area where the electrode body 20 is placed and gravity is sensed by the electrode body 20, the pressure distribution in that area is excluded.
• an R surface may be formed at least one of the corners 64 to 67 of the pair of lid bodies 60. In this case, as shown in Fig.
• the radius of curvature of corners 20A to 20D can be made larger than the radius of curvature of corners 64 to 67, thereby making the outer periphery L1 or L1' smaller than the outer periphery L2 or L3.
• Fig. 10A and Fig. 10B have been described using the lid body 60B as an example, but the same applies to the lid body 60A.
• the exterior film 50 of the power storage device 10 may protrude outward from at least one of the two lid bodies 60 in the FB direction.
• the electrode body 20 is sealed by closing the portion of the exterior film 50 that protrudes outward from the lid body 60.
• the portion of the exterior film 50 that protrudes outward from the lid body 60 may be folded inward so that the outer surfaces of the exterior film 50 come into contact with each other, as in a Goebel-top container, or may be folded toward any surface of the exterior body 40, as in a brick container.
• the exterior body 40 of the electricity storage device 10 and the electricity storage device manufacturing kit 100 may not have one of the pair of lid bodies 60.
• the electrode body 20 in a portion of the exterior body 40 where the lid body 60 is omitted, the electrode body 20 is sealed by closing a portion of the exterior film 50 that protrudes outward beyond the electrode body 20.
• the portion of the exterior film 50 that protrudes outward beyond the electrode body 20 may be folded like a Goebel-top container or a brick container.
• the entire area between the first surface 61 and the second surface 62 of the lid body 60 is the bonding surface 63, but all of the surfaces connecting the first surface 61 and the second surface 62 do not have to be configured as the bonding surface 63.
• the above frame-shaped portion is formed in the lid body 60, it is sufficient that at least a portion of the frame-shaped portion in the FB direction is the bonding surface.
• the materials constituting the two heat-sealable resin layers of the adhesive film may be the same or different, and are appropriately selected according to the material constituting the heat-sealable resin layer 53 of the exterior film 50 and the material constituting the lid body.
• the material constituting the heat-sealing resin layer of the adhesive film on the side to be bonded to the lid body is preferably an acid-modified polyolefin resin graft-modified with an acid such as maleic anhydride.
• the heat-sealing resin layer of the adhesive film on the side to be bonded to the exterior film 50 is preferably made of the same type of material as the material constituting the heat-sealing resin layer 53 of the exterior film 50.
• the outer shape of the exterior body 40 can be changed as desired.
• the outer shape of the exterior body 40 may be a cylinder, a prism, or a cube.

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• Engineering & Computer Science (AREA)
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• Microelectronics & Electronic Packaging (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
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• Sealing Battery Cases Or Jackets (AREA)
• Electric Double-Layer Capacitors Or The Like (AREA)
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Citations (5)

• 2024
  • 2024-10-02 JP JP2025538026A patent/JP7750453B2/ja active Active
  • 2024-10-02 CN CN202480063367.XA patent/CN121970165A/zh active Pending
  • 2024-10-02 WO PCT/JP2024/035283 patent/WO2025075043A1/ja active Pending
• 2025
  • 2025-09-11 JP JP2025151199A patent/JP2025172967A/ja active Pending

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