Manufacturing method of case component for power storage device, case component for power storage device, and power storage device

Abstract

To improve a bonding property between a plate member and a sealing material.SOLUTION: A manufacturing method of a case component 14 includes: Step S10 of preparing a plate member 14a; Step S20 of arranging the plate member 14a in a metal mold 60; and Step S30 of integrally molding the plate member 14a and a sealing material 30. In Step S30 of integrally molding the plate member 14a and the sealing material 30, a resin 31 is poured into the metal mold 60 to integrally mold the plate member 14a and the sealing material 30 for sealing the plate member 14a. The metal mold 60 has convex parts 62a and 67a that are pressed against the periphery of a through hole 14b of the plate member 14a. Step S20 of arranging the plate member 14a in the metal mold 60 includes pressing the convex parts 62a and 67a of the metal mold 60 against the periphery of the through hole 14b of the plate member 14a. In the plate member 14a, a concave part 14f is formed between a position against which the convex parts 62a and 67a of the metal mold 60 are pressed and the through hole 14b.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a case part for an electricity storage device, a case part for an electricity storage device, and an electricity storage device. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2005-4968 discloses a method for manufacturing a sealing plate in which an electrode terminal is integrated into a sealing plate main body made of a polymeric material by insert molding. In the manufacturing method disclosed in this publication, when a mold used for insert molding is clamped, the mold is pressed against the end surface of the electrode terminal, thereby blocking the sealing plate main body molding material. The mold is provided with an annular protrusion that bites into the end surface of the electrode terminal when clamped. The diameter of the annular protrusion is set smaller than the diameter of the outer periphery of the electrode terminal. This manufacturing method is said to effectively prevent electrolyte from seeping into the joint surface between the sealing plate main body and the electrode terminal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-4968 Summary of the Invention [Problem to be solved by the invention]

[0004] In case components used in electricity storage devices, the plate member and the sealing material must be firmly joined. [Means for solving the problem]

[0005] The method for manufacturing a case part for an electricity storage device disclosed herein includes the steps of preparing a plate-shaped plate member having a through hole formed therein, placing the plate member in a mold, and pouring resin into the mold to integrally mold the plate member and a sealing material that seals the plate member. The mold has a convex portion that is pressed against the periphery of the through hole in the plate member. The step of placing the plate member in the mold includes pressing the convex portion of the mold against the periphery of the through hole in the plate member. The plate member has a concave portion formed between the position where the convex portion of the mold is pressed and the through hole. Case parts manufactured by this manufacturing method have good bonding between the plate member and the sealing material. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view of an electricity storage device 100. As shown in FIG. [Figure 2] FIG. 2 is a flowchart of a method for manufacturing the electricity storage device case component 14. [Figure 3] FIG. 3 is a perspective view of the plate member 14a. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a schematic diagram of the plate member 14a placed in the mold 60. As shown in FIG. [Figure 6] FIG. 6 is a schematic diagram of the plate member 14a placed in the mold 60. As shown in FIG. [Figure 7] FIG. 7 is a schematic diagram of the case part 14 integrally molded in a mold 60. As shown in FIG. [Figure 8] FIG. 8 is a schematic diagram showing the deformation of the plate member 14a. [Figure 9] FIG. 9 is a cross-sectional view of the electricity storage device 100. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0007] An embodiment of the technology disclosed herein will now be described with reference to the drawings. The embodiments described herein are, of course, not intended to limit the present invention. The drawings are schematic and do not necessarily reflect the actual product. Furthermore, identical reference numerals are used to designate components and parts that perform the same function, and redundant descriptions will be omitted where appropriate. In the following description, the reference numerals L, R, F, Rr, U, and D in the drawings represent left, right, front, rear, top, and bottom, and the reference numerals X, Y, and Z in the drawings represent the long side direction, short side direction, and height direction, respectively. However, these directions are merely used for convenience of explanation and do not limit the present invention in any way.

[0008] FIG. 1 is a perspective view of an electricity storage device 100. FIG. 2 is a flowchart of a method for manufacturing an electricity storage device case part 14. FIG. 3 is a perspective view of a plate member 14a. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. FIGS. 5 and 6 are schematic views of the plate member 14a placed in a mold 60. FIG. 5 shows the plate member 14a placed on a lower mold 61. FIG. 6 shows the plate member 14a sandwiched between a lower mold 61 and an upper mold 66. FIG. 7 is a schematic view of the case part 14 integrally molded in the mold 60. Hatching of the mold 60 has been omitted in FIGS. 5 to 7. FIG. 8 is a schematic view showing deformation of the plate member 14a. FIG. 9 is a cross-sectional view of the electricity storage device 100. In FIG. 8, the mold 60 engaged with the plate member 14a and the deformed portion of the plate member 14a are indicated by dashed double-dashed lines. FIG. 9 shows a schematic diagram of the case part 14 attached to the case 10.

[0009] As shown in FIG. 1, the electricity storage device 100 includes an electrode assembly 40 (see FIG. 9) and a case 10 that houses the electrode assembly 40. Although not shown, an electrolyte solution is also housed inside the case 10. The electrode assembly 40 and the electrolyte solution are power generation elements of the electricity storage device 100. These power generation elements can be any of those that can be used in conventionally known electricity storage devices without any particular restrictions, and therefore detailed description thereof will be omitted.

[0010] In this specification, the term "electricity storage device" refers to a concept that encompasses devices in which charge and discharge reactions occur due to the movement of charge carriers between a pair of electrodes (positive and negative electrodes). That is, the electricity storage device in the technology disclosed herein encompasses secondary batteries such as lithium ion secondary batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, as well as capacitors such as lithium ion capacitors and electric double layer capacitors.

[0011] In this specification, a case component refers to a component that constitutes the case of an electricity storage device. For example, the electricity storage device 100 shown in FIG. 1 uses a case 10 composed of a case body 12 and a lid 14. The case body 12 has an opening at the top. The lid 14 is a component that is attached to the opening of the case body 12 and seals the opening. In this case 10, the case body 12 and the lid 14 each serve as a case component. In the embodiment shown in FIG. 1, an electrode terminal 20 and a sealant 30 are attached to the lid 14 as a case component. Here, the electrode terminal 20 and the sealant 30 are attached to the lid 14, but the electrode terminal 20 and the sealant 30 may also be attached to the case body 12. The case component may be made of aluminum or an aluminum alloy. A method for manufacturing the case component 14 as the lid 14 for the embodiment shown in FIG. 1 will be described below.

[0012] <Method for manufacturing the case part 14 for the electricity storage device> As shown in FIG. 2, the manufacturing method of the case part 14 for an electricity storage device (hereinafter also referred to simply as the "case part") includes a step S10 of preparing a plate member 14a, a step S20 of placing the plate member 14a in a mold 60, and a step S30 of integrally molding the plate member 14a and the sealing material 30.

[0013] <Step S10 of Preparing Plate Member 14a> In step S10 of preparing plate member 14a, plate member 14a having through-holes 14b formed therein is prepared as shown in Fig. 3. Plate member 14a is also called a sealing plate and is a member that closes case body 12 (see Fig. 1) in which the electrode body is housed. Plate member 14a is made of the same material as case body 12, and may be made of, for example, aluminum or an aluminum alloy. Plate member 14a is a long, plate-like member.

[0014] Through holes 14b are provided at both ends of the plate member 14a. The through holes 14b are generally rectangular openings in a plan view. The planar shape of the through holes 14b is not particularly limited as long as the electrode terminals 20 (see FIG. 1) can be inserted therethrough. The planar shape of the through holes 14b may be circular, elliptical, or the like.

[0015] A groove 14e surrounding the through hole 14b is formed on the outer surface 14c of the plate member 14a. Similarly, a groove 14e (see FIG. 4) surrounding the through hole 14b is also formed on the inner surface 14d of the plate member 14a. The groove 14e is formed at a position against which a mold 60 (see FIG. 5) will be pressed in a later process.

[0016] The step S10 of preparing the plate member 14a may include forming the recess 14f in the plate member 14a. The method of forming the recess 14f and the second recess 14e is not particularly limited. In the step S10 of preparing the plate member 14a, the recess 14f may be formed in the plate member 14a by a known method such as cutting or forging.

[0017] The plate member 14a has recesses 14f formed between the through-holes 14b and positions (grooves 14e) against which the mold 60 (see FIG. 5) is pressed. In other words, the recesses 14f are provided between the through-holes 14b and the positions against which the mold 60 is pressed. The recesses 14f are provided close to the grooves (the positions against which the mold 60 is pressed). The recesses 14f are provided at positions closer to the grooves 14e than the through-holes 14b. The recesses 14f are provided on both the outer surface 14c and the inner surface 14d of the plate member 14a.

[0018] The recess 14f has a generally rectangular recessed shape when viewed along the direction in which the groove 14e extends (see FIG. 4). In this embodiment, the recess 14f surrounds the entire periphery of the through hole 14b. The recess 14f is continuous in a generally rectangular shape around the periphery of the through hole 14b in a plan view. Note that the recess 14f does not necessarily have to be continuous around the entire periphery of the through hole 14b. The recess 14f may be discontinued around the periphery of the through hole 14b. There may be portions around the through hole 14b where the recess 14f is not formed.

[0019] The step S10 of preparing the plate member 14a may include forming a second recess in the plate member 14a. The second recess may be formed by a method similar to the method for forming the recess 14f. The plate member 14a may have a second recess provided at a position where the mold 60 is pressed. Herein, the second recess is provided on both the outer surface 14c and the inner surface 14d of the plate member 14a. In this embodiment, the groove 14e corresponds to the second recess. Hereinafter, the groove 14e will also be referred to as the second recess 14e. In this embodiment, the second recess 14e surrounds the entire periphery of the through hole 14b (and the recess 14f). The second recess 14e is continuous in a substantially rectangular shape around the recess 14f in a plan view.

[0020] The second recess 14e has a straight portion 14e1 parallel to the straight portion 14b1 of the substantially rectangular through hole 14b, and a corner 14e2 connecting adjacent straight portions 14e1. The straight portion 14e1 of the second recess 14e is spaced a substantially constant distance from the straight portion 14b1 of the through hole 14b and is substantially parallel to the straight portion 14b1 of the through hole 14b. The corner 14e2 of the second recess 14e is substantially arc-shaped and connects the ends of adjacent straight portions 14e1.

[0021] The shape of the second recess 14e is not particularly limited. In this embodiment, as shown in FIG. 4, the second recess 14e has a generally wedge-shaped recess when viewed along the direction in which the groove 14e extends. The second recess 14e narrows in the depth direction. The shape of the second recess 14e can be set according to the shape of the mold 60 to be pressed against. The second recess 14e may be partially provided around the recess 14f. When the second recess 14e is partially provided, it may be provided outside at least the corners 14b2 of the rectangular through-hole 14b. For example, at least the arc-shaped corners 14e2 of the above-described second recess 14e may be provided. The second recess 14e (groove 14e) does not necessarily have to be provided.

[0022] The plate member 14a may be provided with a roughened portion 14a1 that has been roughened to improve adhesion to the sealing material 30. The roughened portion 14a1 is a portion that has a relatively high surface roughness due to roughening (surface treatment) of the member. The roughened portion 14a1 may be formed by processes such as laser irradiation, sandblasting, and chemical etching. The plate member 14a may be provided with the roughened portion 14a1 around the through hole 14b. The roughened portion 14a1 may be provided inside the position (groove 14e) where the mold 60 is pressed. In this embodiment, the roughened portion 14a1 is provided in an area inside the recess 14f. The roughened portion 14a1 may be formed on the inner circumferential surface of the through hole 14b. The roughened portion 14a1 provided on the plate member 14a improves adhesion between the plate member 14a and the sealing material 30. The surface roughness (arithmetic mean roughness Ra) of the roughened portion 14a1 is higher than that of the non-roughened portion. The arithmetic mean roughness Ra can be measured using a stylus-type surface roughness measuring instrument in accordance with JIS B0601:2001, for example.

[0023] In this embodiment, the roughening process is performed by laser irradiation. By performing the roughening process by laser irradiation, processing such as coating and removal during processing is not required. This makes the plate member 14a suitable for mass production.

[0024] The surface shape of the roughened portion 14a1 is not particularly limited. A surface roughened by laser irradiation may have numerous convex portions that are higher than the base material surface before processing due to the adhesion of fumes during processing. A surface roughened by chemical etching may have numerous concave portions that are recessed from the base material surface before processing. The surface of the roughened portion 14a1 is not limited to a shape having concaves and convexes. The surface of the roughened portion 14a1 may be a porous surface with numerous fine holes formed therein. The roughened portion 14a1 may also be a surface with numerous claw-shaped protrusions formed by thin, layered warping of the surface.

[0025] The timing of the roughening is not particularly limited. In this embodiment, the roughening is performed between the recess 14f and the through-hole 14b after the recess 14f is formed. After the recess 14f is formed by the above-described method, the surface of the plate member 14a may be roughened from the edge of the recess 14f along the edge of the through-hole 14b. This can improve the positional accuracy of the roughening. Furthermore, by forming the recess 14f in advance, the processing of the recess 14f does not affect the roughened portion 14a1, and therefore the quality of the roughened portion 14a1 can be improved.

[0026] <Step S20 of placing the plate member 14a in the mold 60> 5, in step S20 of placing the plate member 14a in the mold 60, the electrode terminal 20 and the plate member 14a are placed in the mold 60 with the electrode terminal 20 inserted into the through-hole 14b of the plate member 14a. At this time, the electrode terminal 20 and the plate member 14a are placed in the mold 60 so that the electrode terminal 20 and the plate member 14a do not come into contact with each other.

[0027] In this embodiment, the electrode terminal 20 has a shaft portion 22 and a plate portion 24. The shaft portion 22 is the portion that is inserted into the through-hole 14b. The shaft portion 22 is an elongated plate-like member that extends in the height direction Z. The shape of the shaft portion 22 is not limited to a plate shape, and may be a columnar shape (cylindrical, rectangular columnar) or the like. In the manufactured electricity storage device 100, the shaft portion 22 is housed inside the case 10 and connected to the electrode body 40 (see FIG. 9 ). The shaft portion 22 can be connected to the electrode body 40 via a current collecting terminal or the like.

[0028] The plate portion 24 is a member that is disposed along the plate member 14a when the shaft portion 22 is inserted into the through-hole 14b. The plate portion 24 is continuous from the upper end of the shaft portion 22. The plate portion 24 is exposed to the outside of the case 10 and is connected to an external conductive member such as a bus bar (see FIG. 1). The plate portion 24 extends in the width direction X (see FIG. 1). The planar shape of the plate portion 24 is substantially rectangular. The plate portion 24 and the shaft portion 22 may be formed by bending a long, plate-shaped conductive member. Note that the electrode terminal does not need to be an integrated component in which the shaft portion and the plate portion are continuous. For example, the electrode terminal may be constructed by separately manufacturing the shaft portion and the plate portion and combining them.

[0029] The electrode terminal 20 may include a portion whose surface has been roughened. The surface of the electrode terminal 20 that is housed in the mold 60 and exposed to the internal space of the mold 60 may be roughened. When the electrode terminal 20 includes a portion that has been roughened, the bonding strength between the electrode terminal 20 and the sealing material 30 may be improved. The method for roughening the electrode terminal 20 may be the same as the method for roughening the plate member 14a, and therefore a detailed description thereof will be omitted.

[0030] The configuration of the mold 60 can be set appropriately depending on the shapes of the plate member 14a and the electrode terminal 20. In this embodiment, the mold 60 includes a lower mold 61 and an upper mold 66. The material of the mold 60 is not particularly limited, but it can be made of a high-strength metal material such as stainless steel, die steel, or maraging steel.

[0031] The lower mold 61 is a mold in which the plate member 14a and the electrode terminal 20 are arranged. The lower mold 61 has an upper surface 62 on which the plate member 14a is placed, and a recess 63 recessed downward from the upper surface 62.

[0032] As shown in FIG. 5 , the upper surface 62 of the lower mold 61 is a flat surface that conforms to the outer surface 14c of the plate member 14a. The outer surface 14c of the plate member 14a is placed on the upper surface 62. The lower mold 61 has a protrusion 62a that is pressed against the periphery of the through hole 14b of the plate member 14a. The protrusion 62a protrudes upward from the upper surface 62 of the lower mold 61. The protrusion 62a is provided continuously in the circumferential direction so as to surround the through hole 14b when the plate member 14a is placed in the lower mold 61. The recess 63 has a shape that conforms to the shape of the plate portion 24. The recess 63 is recessed in a substantially rectangular shape. The depth of the recess 63 is slightly smaller than the thickness of the plate portion 24 of the electrode terminal 20. The depth of the recess 63 is not particularly limited. The recess 63 functions as a cavity surface in the subsequent integral molding process.

[0033] The upper mold 66 is a mold that is pressed against the plate member 14a. The upper mold 66 has a lower surface 67 that is placed on the plate member 14a and a recessed portion 68 that is recessed upward from the lower surface 67. The lower surface 67 of the upper mold 66 is a flat surface that conforms to the inner surface 14d of the plate member 14a. The lower surface 67 is placed on the inner surface 14d of the plate member 14a (see FIG. 6). The upper mold 66 has a protruding portion 67a that is pressed against the periphery of the through hole 14b of the plate member 14a. The protruding portion 67a protrudes downward from the lower surface 67 of the upper mold 66. The protruding portion 67a is provided continuously in the circumferential direction so as to surround the through hole 14b when the upper mold 66 is placed on the plate member 14a. Like the recessed portion 63, the recessed portion 68 has a shape that conforms to the shape of the plate portion 24. The recessed portion 68 is recessed in a substantially rectangular shape. The depth of the recess 68 is approximately the same as the depth of the recess 63. The depth of the recess 68 is not particularly limited. The recess 68 of the upper mold 66 is provided with a through-hole 68a through which the shaft portion 22 of the electrode terminal 20 passes. The recess 68 also has an injection hole 69. The injection hole 69 is a hole for injecting the resin 31 (see FIG. 7) into the mold 60. The recess 68 functions as a cavity surface in the subsequent integral molding process.

[0034] The shape, dimensions, arrangement, etc. of the protrusions 62a, 67a may be set according to the configuration of the plate member 14a and are not particularly limited. When viewed along the direction in which the protrusions 62a, 67a are continuously provided, the protrusions 62a, 67a are protruding portions with a generally wedge-shaped cross section. The protrusions 62a, 67a become thinner in the height direction of the protrusions 62a, 67a. The protrusions 62a, 67a have generally the same shape and dimensions. In this embodiment, the protrusions 62a, 67a are provided in positions where they overlap in the vertical direction. In this embodiment, the protrusions 62a, 67a are provided in positions where they overlap the second recesses 14e formed on the outer surface 14c and inner surface 14d of the plate member 14a. The height of the protrusions 62a, 67a is greater than the depth of the second recesses 14e.

[0035] The plate member 14a is placed on the upper surface 62 of the lower mold 61 with the outer surface 14c facing downward. In this embodiment, the plate member 14a is placed on the lower mold 61 so that the second recess 14e fits into the protrusion 62a on the upper surface 62 of the lower mold 61. The plate member 14a is supported by the protrusion 62a. The outer surface 14c of the plate member 14a is slightly raised above the upper surface 62 of the lower mold 61. The plate portion 24 of the electrode terminal 20 is placed on the bottom surface of the recess 63 of the lower mold 61 with the upper surface 24a facing downward. The electrode terminal 20 passes through the through hole 14b of the plate member 14a. The upper surface 24a of the plate portion 24 of the electrode terminal 20 protrudes downward below the outer surface 14c of the plate member 14a.

[0036] In step S20 of placing the plate member 14a in the mold 60, the plate member 14a is clamped between the lower mold 61 and the upper mold 66. As described above, the lower mold 61 may be attached to a base (not shown), and the upper mold 66 may be attached to a press device (not shown).

[0037] As shown in FIG. 6 , the plate member 14a is sandwiched and pressed between a lower mold 61 and an upper mold 66 with the electrode terminals 20 inserted into the through holes 14b. A protrusion 67a of the upper mold 66 is pressed against a second recess 14e on the inner surface 14d of the plate member 14a. The plate member 14a is pressed by the protrusion 62a of the lower mold 61 and the protrusion 67a of the upper mold 66, which are provided at corresponding positions in the up-down direction. The protrusions 62a and 67a of the lower mold 61 and the upper mold 66 are pressed against the periphery of the through hole 14b (in this embodiment, the second recess 14e). At this time, the protrusions 62a and 67a bite into the periphery of the through hole 14b, and the periphery of the portion where the protrusions 62a and 67a are pressed is deformed. Resin 31 (see FIG. 7) is poured into the mold 60 in a state where the protrusions 62a and 67a are engaged with the periphery of the through-hole 14b and the plate member 14a is clamped.

[0038] <Step S30 of integrally molding the plate member 14a and the sealing material 30> In step S30 of integrally molding the plate member 14a and the sealing material 30, resin is poured into a mold 60 to integrally mold the plate member 14a and the sealing material 30. Here, the plate member 14a, the electrode terminals 20, and the sealing material 30 are integrally molded. The sealing material 30 is a member that seals the plate member 14a.

[0039] As shown in FIG. 7 , resin 31 is poured into a mold 60 in which electrode terminal 20 and plate member 14a are arranged. The electrode terminal 20 and plate member 14a are joined via the sealant 30 by so-called injection molding. Here, resin 31 is poured through an injection hole 69 in an upper mold 66. Resin 31 flows into the space surrounded by recess 63 in the lower mold 61, recess 68 in the upper mold 66, plate member 14a, and electrode terminal 20.

[0040] The resin 31 may be a thermoplastic resin such as polyethylene, polyamide, polypropylene, or vinyl chloride resin. After the resin 31 is injected, the mold 60 is cooled, which also cools the resin 31. The cooled resin 31 hardens and forms the sealing material 30. As a result, the sealing material 30 fills the gap between the first surface 21 of the electrode terminal 20 and the plate member 14a. In this way, the plate member 14a, the electrode terminal 20, and the sealing material 30 are integrally molded, and the case part 14 is manufactured.

[0041] Because the roughened portion 14a1 of the plate member 14a has a large surface roughness, the resin 31 easily penetrates into the surface of the roughened portion 14a1. The resin 31 hardens while remaining in the surface of the roughened portion 14a1. This tends to improve the bonding strength between the sealing material 30 and the electrode terminal 20 after hardening due to a so-called anchor effect.

[0042] The plate member 14a and the electrode terminal 20 are arranged in the mold 60 so that they do not come into contact with each other. For this reason, in the case part 14, a sealant 30 is interposed between the plate member 14a and the electrode terminal 20. This prevents interference between the plate member 14a and the electrode terminal 20. The upper surface 24a of the plate portion 24 of the electrode terminal 20 is not covered with the sealant 30 and is exposed to the outside of the case 10.

[0043] Incidentally, when a plate member is placed in a mold and a convex portion of the mold is pressed against the periphery of a through hole in the plate member, the plate member may be deformed by the convex portion being pressed against it. For example, when the convex portion of the mold is pressed against it, the portion of the plate member against which the convex portion is pressed may be depressed. According to the inventor's findings, when the portion against which the convex portion is pressed is depressed, the surrounding area may be raised. For example, a raised portion may be formed by plastic deformation between the portion against which the convex portion is pressed and the through hole. This may impair flatness between the portion against which the convex portion is pressed and the through hole. This may weaken the bond between the plate member and the sealing material.

[0044] In the embodiment described above, the manufacturing method for the case component 14 includes the steps of: step S10 of preparing a plate member 14a; step S20 of placing the plate member 14a in a mold 60; and step S30 of integrally molding the plate member 14a and the sealing material 30. In step S30 of integrally molding the plate member 14a and the sealing material 30, resin 31 is poured into the mold 60 to integrally mold the plate member 14a and the sealing material 30 that seals the plate member 14a. The mold 60 has protrusions 62a and 67a that are pressed against the periphery of the through hole 14b of the plate member 14a. Step S20 of placing the plate member 14a in the mold 60 includes pressing the protrusions 62a and 67a of the mold 60 against the periphery of the through hole 14b of the plate member 14a. The plate member 14a has a recess 14f formed between the position where the protrusions 62a and 67a of the mold 60 are pressed and the through hole 14b.

[0045] As shown in FIG. 8 , the protrusions 62a and 67a are pressed against the plate member 14a, causing deformation around the pressed portion. At this time, because a recess 14f is formed between the position where the protrusions 62a and 67a of the mold 60 are pressed and the through hole 14b, deformation is likely to occur between the recess 14f and the position where the protrusions 62a and 67a are pressed. For example, when the protrusions 62a and 67a are pressed against the plate member 14a, the portion between the recess 14f and the position where the protrusions 62a and 67a are pressed against the plate member 14a is likely to deform toward the recess 14f. Therefore, deformation caused by the protrusions 62a and 67a being pressed against the plate member 14a is less likely to extend to the through hole 14b side than the recess 14f. This makes it easier to maintain a flat state between the recess 14f and the through hole 14b. As a result, the plate member 14a and the sealing material 30 after integral molding have good bonding properties. This improves the airtightness of the electricity storage device 100 provided by the seal material 30.

[0046] The dimensions of the recess 14f are not particularly limited, but may be determined depending on the amount of deformation caused by the protrusions 62a, 67a being pressed against the plate member 14a. For example, the volume of the recess 14f of the plate member 14a may be set to be equal to or greater than the volume of the protrusions 62a, 67a that are engaged with the plate member 14a when the protrusions 62a, 67a of the mold 60 are pressed against the periphery of the through hole 14b of the plate member 14a. This makes it less likely that deformation caused by the protrusions 62a, 67a being pressed against the recess 14f will extend to the through hole 14b side.

[0047] In the above-described embodiment, the plate member 14a is roughened at least between the recessed portion 14f and the through-hole 14b to improve the bonding strength with the sealing material 30. Even in such a plate member 14a, the portion between the recessed portion 14f and the through-hole 14b is less likely to deform, and therefore the roughened portion is more likely to be maintained. As a result, the bonding strength between the plate member 14a and the sealing material 30 can be improved due to the anchor effect.

[0048] In the embodiment described above, the plate member 14a has the second recesses 14e at positions where the protrusions 62a, 67a of the mold 60 are pressed against. This makes it easy to position the plate member 14a relative to the mold 60. Furthermore, because the positions where the protrusions 62a, 67a are pressed against are recessed in advance, the amount of deformation of the plate member 14a when the protrusions 62a, 67a are pressed against can be reduced.

[0049] In the above-described embodiment, the through hole 14b of the plate member 14a is rectangular. The second recess 14e is provided at least outside the corner 14b2 of the rectangular through hole 14b. Compared to the straight portion 14b1, the area from the corner 14b2 of the through hole 14b to the corner 14e2 of the second recess 14e is smaller at the corner 14b2 relative to the dimension where the protrusions 62a and 67a are pressed. Therefore, the amount of deformation per unit area may be large between the corner 14b2 of the through hole 14b and the corner 14e2 of the second recess 14e. Providing the second recess 14e outside the corner 14b2 makes it easier to reduce deformation in areas where the amount of deformation is likely to be large. For the same reason, when the recess 14f is provided partially around the through hole 14b, it may be provided outside the corner 14b2.

[0050] In the embodiment described above, the second recess 14e of the plate member 14a surrounds the entire periphery of the through hole 14b, which makes it easier to suppress deformation even if any part between the through hole 14b and the second recess 14e deforms.

[0051] Furthermore, recess 14f of plate member 14a surrounds the entire periphery of through hole 14b, which makes it easier to suppress deformation even if any part between through hole 14b and second recess 14e deforms.

[0052] In the above-described embodiment, the protrusions 62a, 67a of the mold 60 are wedge-shaped, which makes it difficult for the resin 31 to flow out of the mold 60. Also, since the size of the protrusions that fit into the plate member 14a is small, deformation of the plate member 14a can be suppressed.

[0053] In the above-described embodiment, the recessed portion 14f is provided in the vicinity of the position against which the protruding portions 62a, 67a of the mold 60 are pressed. This makes it easy to keep within a narrow range the deformation of the plate member 14a caused by the protruding portions 62a, 67a being pressed against the recessed portion 14f.

[0054] As shown in FIG. 9 , the case part 14 manufactured by the above manufacturing method includes a plate member 14a having a through hole 14b formed therein, an electrode terminal 20 inserted into the through hole 14b of the plate member 14a, and a sealant 30 interposed between the plate part 24 and the electrode terminal 20. The plate member 14a includes a continuous groove 14e surrounding the through hole 14b and a recess 14f formed between the groove 14e and the through hole 14b. The sealant 30 fills the recess 14f. The case part 14 can be used as the lid 14 of the electricity storage device 100. Alternatively, the electricity storage device 100 can be manufactured by accommodating an electrode assembly in the case body 12 and sealing the opening of the case body 12 with the lid 14 using a known method.

[0055] The case part 14 is not limited to the above-described form. When the electrode terminals and the sealing material are provided on the case body, the case part may be manufactured as the case body by the above-described method. The case part disclosed herein may constitute the case body or the lid.

[0056] The case component 14 disclosed herein is formed by integrally molding the plate member 14a, the electrode terminal 20, and the sealing material 30. However, the present invention is not limited to this configuration. The manufacturing method for the case component 14 described above can also be applied to cases where a component to be integrally molded with the case 10, such as a safety valve, is manufactured separately from the case 10.

[0057] The technology disclosed herein has been described in various ways. Unless otherwise specified, the embodiments and the like described herein do not limit the present invention. Furthermore, the technology disclosed herein can be modified in various ways, and as long as no particular problems arise, each component and each process described herein can be omitted or combined as appropriate. Furthermore, this specification includes the disclosures described in the following sections.

[0058] Section 1: a step of preparing a plate-shaped plate member having a through hole formed therein; placing the plate member in a mold; a step of pouring resin into the mold to integrally mold the plate member and a sealing material that seals the plate member; Including, the die has a protrusion that is pressed against the periphery of the through hole of the plate member, the step of placing the plate member in a mold includes pressing the convex portion of the mold against a periphery of the through hole of the plate member, a recess is formed in the plate member between a position where the protrusion of the mold is pressed and the through hole; A manufacturing method for case parts for an electricity storage device.

[0059] Section 2: Item 1, wherein the plate member is subjected to a roughening process to improve bonding with the sealing material at least between the recess and the through hole.

[0060] Section 3: Item 3. The method for manufacturing a case part for an electricity storage device according to Item 2, wherein the step of preparing the plate member includes forming the recess in the plate member, and performing the roughening process between the recess and the through hole after forming the recess.

[0061] Section 4: 4. The method for manufacturing a case part for an electricity storage device according to any one of items 1 to 3, wherein the plate member is provided with a second recess at a position against which the protrusion of the mold is pressed.

[0062] Section 5: Item 5. The method for manufacturing a case part for an electricity storage device according to item 4, wherein the through hole of the plate member is rectangular, and the second recess is provided outside at least a corner of the rectangular through hole.

[0063] Item 6: Item 6. The method for manufacturing an electricity storage device case part according to item 4 or 5, wherein the second recess of the plate member surrounds the entire periphery of the through hole.

[0064] Section 7: 7. The method for manufacturing a case part for an electricity storage device according to any one of items 1 to 6, wherein a volume of the recess of the plate member is equal to or larger than a volume of the protrusion of the mold that is bitten into the plate member when the protrusion is pressed against the periphery of the through hole of the plate member.

[0065] Section 8: 8. The method for manufacturing an electricity storage device case part according to any one of items 1 to 7, wherein the recess of the plate member surrounds the entire periphery of the through hole.

[0066] Section 9: Item 9. The method for manufacturing a case part for an electricity storage device according to any one of items 1 to 8, wherein the convex portion of the mold is wedge-shaped.

[0067] Section 10: Item 10. The method for manufacturing an electricity storage device case part according to any one of items 1 to 9, wherein the recess is provided in the vicinity of a position against which the protrusion of the mold is pressed.

[0068] Section 11: a plate-shaped plate member having a through hole formed therein; an electrode terminal inserted into the through hole of the plate member; a sealing material interposed between the plate member and the electrode terminal; Equipped with the plate member includes a continuous groove surrounding the through hole and a recess formed between the groove and the through hole, The sealing material is embedded in the recess. Case parts for power storage devices.

[0069] Section 12: An electrode body; a case body having an opening and accommodating the electrode body; a lid attached to the opening; Equipped with The case body or the lid is a case part for an electricity storage device according to item 11. Energy storage device.

[0070] 10 cases 12 Case body 14 Case parts (lid) 14a Plate member 14a1 Roughened surface 14b Through hole 14b1 Straight section 14b2 corner 14c External surface 14d inner surface 14e Groove 14e1 Straight section 14e2 corner 14f recess 20 electrode terminal 22 Shaft 24 Board part 24a Top side 30 Sealing material 31 Resin 40 Electrode body 60 molds 61 Lower mold 62 Top surface 62a, 67a convex part 63,68 Recess 66 Upper mold 67 Bottom surface 68a through hole 69 Injection hole 100 Energy storage device

Claims

1. a step of preparing a plate-shaped plate member having a through hole formed therein; placing the plate member in a mold; a step of pouring resin into the mold to integrally mold the plate member and a sealing material that seals the plate member; Including, the die has a protrusion that is pressed against the periphery of the through hole of the plate member, the step of placing the plate member in a mold includes pressing the convex portion of the mold against a periphery of the through hole of the plate member, a recess is formed in the plate member between a position where the protrusion of the mold is pressed and the through hole; A manufacturing method for case parts for an electricity storage device.

2. The method for manufacturing a case part for an electric storage device according to claim 1 , wherein the plate member is subjected to a surface roughening process that improves bonding with the sealing material at least between the recess and the through hole.

3. 3. The method for manufacturing a case part for an electric storage device according to claim 2, wherein the step of preparing the plate member includes forming the recess in the plate member, and performing the roughening process between the recess and the through hole after forming the recess.

4. The method for manufacturing a case part for an electric storage device according to any one of claims 1 to 3, wherein the plate member has a second recess at a position where the protrusion of the mold is pressed against.

5. 5. The method for manufacturing a case part for an electric storage device according to claim 4, wherein the through hole of the plate member is rectangular, and the second recess is provided outside at least a corner of the rectangular through hole.

6. The method for manufacturing an electricity storage device case part according to claim 4 , wherein the second recess of the plate member surrounds the entire periphery of the through hole.

7. The method for manufacturing a case part for an electric storage device according to any one of claims 1 to 3, wherein the volume of the recess of the plate member is equal to or greater than the volume of the convex portion of the mold that is bitten into the plate member when the convex portion is pressed against the periphery of the through hole of the plate member.

8. 4. The method for manufacturing an electricity storage device case part according to claim 1, wherein the recess of the plate member surrounds the entire periphery of the through hole.

9. The method for manufacturing an electricity storage device case part according to any one of claims 1 to 3, wherein the convex portion of the mold is wedge-shaped.

10. The method for manufacturing a case part for an electric storage device according to any one of claims 1 to 3, wherein the recess is provided in the vicinity of a position against which the protrusion of the mold is pressed.

11. a plate-shaped plate member having a through hole formed therein; an electrode terminal inserted into the through hole of the plate member; a sealing material interposed between the plate member and the electrode terminal; Equipped with the plate member includes a continuous groove surrounding the through hole and a recess formed between the groove and the through hole, The sealing material is embedded in the recess. Case parts for power storage devices.

12. An electrode body; a case body having an opening and accommodating the electrode body; a lid attached to the opening; Equipped with The case body or the lid is the case part for an electricity storage device according to claim 11. Energy storage device.

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