Method of manufacturing case part for power storage device, case part for power storage device, and power storage device

Abstract

To firmly bond an electrode terminal and a resin member to each other.SOLUTION: A method of manufacturing a case part for a power storage device includes: a step S10 of preparing a plate member 14a with a through hole 14b formed therein; a step S20 of bending an electrode terminal member 20a to prepare the electrode terminal member 20a; a step S30 of preparing an electrode terminal 20; a step S40 of arranging the electrode terminal 20 and the plate member 14a in a mold 60; and a step S50 of integrally molding the plate member 14a, the electrode terminal 20, and a sealing material 30. During the step S40 of arranging in the mold 60, the electrode terminal 20 and the plate member 14a are arranged in the mold 60 such that a gap G is formed between a first surface 21 of the electrode terminal 20 and the plate member 14a. During the step S50 of integrally molding, the resin 31 is poured into the mold 60, and the plate member 14a, the electrode terminal 20, and the sealing member 30 are integrally molded. During the step S50 of integrally molding, the gap G is filled.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a case component for a power storage device, a case component for a power storage device, and a power storage device.

Background Art

[0002] Japanese Unexamined Patent Application Publication No. 2021-086813 discloses a sealed battery including a case, an electrode body, a current collector terminal, and an insulating material. The case has a terminal mounting hole. The electrode body is housed inside the case. The current collector terminal has an electrode body connection portion, an external connection portion, and a shaft portion. The electrode body connection portion is disposed inside the case and connected to the electrode body. The external connection portion is disposed outside the case. The shaft portion is located between the electrode body connection portion and the external connection portion and is inserted through the terminal mounting hole. At least one of the electrode body connection portion and the external connection portion has a size that can be inserted through the terminal mounting hole. The insulating material is integrally formed with the case and the current collector terminal so as to fill the space between the terminal mounting hole and the current collector terminal. According to such a sealed battery, it is said that the electrode can be easily taken out to the outside.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventor of the present invention desires to firmly bond an electrode terminal and a resin member in a case component used for a power storage device.

Means for Solving the Problems

[0005] The manufacturing method of the case component for a power storage device disclosed herein includes a step of preparing a plate member with a through hole formed therein, a step of preparing a plate-shaped electrode terminal member having a rough surface on a first surface and inserted into the through hole, a step of preparing a bent electrode terminal by bending the electrode terminal member with the first surface facing inward at a predetermined position, a step of arranging the electrode terminal and the plate member in a mold with the electrode terminal inserted into the through hole, and a step of pouring resin into the mold to integrally mold the plate member, the electrode terminal, and a sealing material. In the step of arranging in the mold, the electrode terminal and the plate member are arranged in the mold so that a gap is formed between the first surface of the electrode terminal and the plate member. In the step of integral molding, the gap is filled with the sealing material. According to such a manufacturing method, a case component in which the electrode terminal and the resin member are firmly joined is provided.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0007] Hereinafter, an embodiment of the technology disclosed herein will be described with reference to the drawings. The embodiments described herein are not, of course, intended to particularly limit the present invention. Each drawing is schematically drawn and does not necessarily reflect the actual object. Also, members and parts having the same function are appropriately given the same reference numerals, and redundant explanations are appropriately omitted. In the following description, the reference numerals L, R, F, Rr, U, and D in the drawings represent left, right, front, rear, up, and down, respectively, 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 are merely directions for convenience of explanation and do not limit the present invention in any way.

[0008] FIG. 1 is a perspective view of the power storage device 100. FIG. 2 is a flowchart of a manufacturing method of the case component 14 for the power storage device. FIG. 3 is a perspective view of the plate member 14a. FIG. 4 is a perspective view of the electrode terminal member 20a. FIG. 5 is a schematic diagram of the electrode terminal member 20a to be bent. FIG. 6 is a schematic diagram of the bent electrode terminal member 20a. FIG. 7 is a schematic diagram of the plate member 14a and the electrode terminal 20 disposed in the mold 60. FIG. 8 is a schematic diagram showing a state where the plate member 14a, the electrode terminal 20, and the sealing material 30 are integrally formed.

[0009] As shown in FIG. 1, the power storage device 100 includes an electrode body and a case 10 that houses the electrode body. Although not shown, an electrolytic solution is also housed inside the case 10. The electrode body and the electrolytic solution are power generation elements of the power storage device 100. Since these power generation elements can be used without particular limitation those used in conventionally known power storage devices, detailed descriptions thereof are omitted.

[0010] The "power storage device" in this specification is a concept that includes a device in which a charge carrier moves between a pair of electrodes (a positive electrode and a negative electrode) to cause a charge and discharge reaction. That is, the power storage device in the technology disclosed herein includes, in addition to secondary batteries such as lithium-ion secondary batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, capacitors such as lithium-ion capacitors and electric double-layer capacitors.

[0011] In this specification, the case component refers to the component that constitutes the case of the power storage device. For example, in the power storage device 100 shown in FIG. 1, a case 10 composed of a case body 12 and a lid 14 is used. The case body 12 has an opening at the upper part. The lid 14 is a component that is attached to the opening of the case body 12 and seals the opening. In such a case 10, the case body 12 and the lid 14 each become case components. In the form shown in FIG. 1, an electrode terminal 20 and a sealing material 30 are attached to the lid 14 as a case component. Here, a form in which the electrode terminal 20 and the sealing material 30 are attached to the lid 14 is shown, but the electrode terminal 20 and the sealing material 30 may be attached to the case body 12. Hereinafter, the manufacturing method of the case component 14 as the lid 14 will be described with respect to the form shown in FIG. 1.

[0012] <Manufacturing Method of Case Component 14 for Power Storage Device> As shown in FIG. 2, the manufacturing method of the case component (hereinafter, also simply referred to as "case component") 14 for a power storage device includes a step S10 of preparing a plate member 14a, a step of preparing an electrode terminal member 20a, a step S30 of preparing an electrode terminal 20, a step S40 of arranging the electrode terminal 20 and the plate member 14a in a mold 60, and a step S50 of integrally molding the plate member 14a, the electrode terminal 20, and the sealing material 30.

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

[0014] Both ends of the plate member 14a are provided with through holes 14b. The through holes 14b are openings that are substantially rectangular in 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] An external groove 14e surrounding the through hole 14b is formed on the outer surface 14c of the plate member 14a. Similarly, an internal groove (not shown) surrounding the through hole 14b is also formed on the inner surface 14d of the plate member 14a. The external groove 14e and the internal groove can contribute to improving the adhesiveness between the plate member 14a and the sealing material 30 after injection molding.

[0016] Note that the plate member 14a may be provided with a rough surface processing portion 14a1 for improving the bonding property with the sealing material 30. The rough surface processing portion 14a1 is a portion where the surface is rough surface processed. The rough surface processing portion 14a1 is a portion where the surface roughness is relatively increased by performing rough surface processing (surface treatment) on the member. The rough surface processing portion 14a1 can be formed, for example, by processes such as laser irradiation, sandblasting, and chemical etching. In the plate member 14a, the rough surface processing portion 14a1 can be provided around the through hole 14b. The rough surface processing portion 14a1 can be formed in a range including the external groove 14e and the internal groove from the through hole 14b on the outer surface 14c and the inner surface 14d. The rough surface processing portion 14a1 may be formed on the inner peripheral surface of the through hole 14b.

[0017] <Process S20 of preparing the electrode terminal member 20a> In the process S20 of preparing the electrode terminal member 20a, a plate-shaped electrode terminal member 20a is prepared. The electrode terminal member 20a is a member that is inserted into the through hole 14b of the plate member 14a. When the electrode terminal member 20a is used as a positive electrode terminal, it can be composed of, for example, aluminum or an aluminum alloy. When the electrode terminal member 20a is used as a negative electrode terminal, it can be composed of, for example, copper or a copper alloy. As shown in FIG. 4, the electrode terminal member 20a is a substantially rectangular plate-shaped member. The electrode terminal member 20a includes a first surface 21 and a second surface 22.

[0018] The first surface 21 is a portion to be joined to the sealing material 30 (see FIG. 1) in a later process. The first surface 21 includes a first portion 21a, a second portion 21b, and a third portion 21c along the long side direction. The first portion 21a, the second portion 21b, and the third portion 21c are each substantially rectangular. The first portion 21a includes one end of the electrode terminal member 20a. The third portion 21c includes the other end of the electrode terminal member 20a. The second portion 21b connects the first portion 21a and the third portion 21c. The first portion 21a has a larger area compared to the second portion 21b and the third portion 21c. The third portion 21c can be set to a dimension smaller than the through hole 14b (see FIG. 3) of the plate member 14a in a plan view.

[0019] In this embodiment, two grooves 23 and 24 are formed on the first surface 21 of the electrode terminal member 20a. The method of forming the grooves 23 and 24 is not particularly limited. The grooves 23 and 24 can be formed, for example, by cutting or the like. The grooves 23 and 24 can be formed along the position where the electrode terminal member 20a is bent in the later "step S30 of preparing the electrode terminal 20". The grooves 23 and 24 are substantially parallel to each other and extend along the short side direction of the electrode terminal member 20a. The groove 23 is formed at the boundary between the first portion 21a and the second portion 21b. The groove 23 is formed at a substantially central portion of the electrode terminal member 20a. The groove 24 is formed at the boundary between the second portion 21b and the third portion 21c. The groove 24 is formed closer to the long side direction end than the central portion of the electrode terminal member 20a.

[0020] Further, a recess 25 is formed on the first surface 21 of the electrode terminal member 20a. The recess 25 is substantially circular in a plan view. The recess 25 is provided at a substantially central portion of the second portion 21b of the first surface 21. The shape of the recess 25 is not particularly limited and may be a polygon including a rectangle. A plurality of recesses 25 may be provided. The recess 25 may not be provided on the first surface 21.

[0021] The first surface 21 of the electrode terminal member 20a prepared here is subjected to rough surface processing. At least a part of the first surface 21 may be subjected to rough surface processing. In this embodiment, the entire surface of the first surface 21 except for the grooves 23 and 24 is subjected to rough surface processing. In other words, the first surface 21 includes rough surface portions 21a to 21c. The rough surface portions 21a to 21c are portions where irregularities are formed on the surface by subjecting the member to rough surface processing (surface treatment), similar to the rough surface portion 14a1 of the plate member 14a, and the surface roughness is relatively high. As the rough surface processing, for example, processes such as laser irradiation, sandblasting, and chemical etching can be adopted. Here, the first surface 21 is subjected to rough surface processing by laser irradiation.

[0022] The surface form of the rough surface portions 21a to 21c is not particularly limited. The surface rough-processed by laser irradiation may form a large number of convex portions that are raised from the surface of the base material before processing due to the adhesion of fumes during processing. The surface rough-processed by chemical etching may form a large number of concave portions that are recessed from the surface of the base material before processing. Note that the surface of the rough surface portions 21a to 21c is not limited to the form in which irregularities are formed. The surface of the rough surface portions 21a to 21c may be a porous surface in which a large number of fine holes are formed. The rough surface portions 21a to 21c may be a surface in which a large number of claw-shaped protrusions with a thin and layer-like warpage on the surface are formed. By rough-processing the first surface 21, the bonding property with the sealing material 30 is improved. The surface roughness of the first surface 21 is higher than the surface roughness (arithmetic mean roughness Ra) of the first surface 21. The arithmetic mean roughness Ra can be measured, for example, based on JIS B0601:2001 using a stylus-type surface roughness measuring instrument.

[0023] The timing of the rough surface processing of the first surface 21 of the electrode terminal member 20a is not particularly limited. The first surface 21 may be rough-processed after the grooves 23 and 24 and the recess 25 are provided. The grooves 23 and 24 and the recess 25 may be provided after the first surface 21 is rough-processed. Although not particularly limited, from the viewpoint of enhancing the bonding property with the sealing material 30, the first surface 21 may be rough-processed after the grooves 23 and 24 and the recess 25 are provided.

[0024] The second surface 22 is the surface on the opposite side of the first surface 21. The second surface 22 includes a first portion 22a, a second portion 22b, and a third portion 22c. The first portion 22a, the second portion 22b, and the third portion 22c of the second surface 22 are provided on the opposite sides of the first portion 21a, the second portion 21b, and the third portion 21c of the first surface 21, respectively. In this embodiment, the first portion 22a is a portion connected to the electrode body when the power storage device 100 (see FIG. 1) is manufactured. The second portion 22b is a portion inserted into the through hole 14b of the plate member 14a. The third portion 22c is a portion exposed outside the power storage device 100. An external connection member such as a bus bar can be connected to the third portion 22c.

[0025] <Process S30 of preparing the electrode terminal 20> In the process S30 of preparing the electrode terminal 20, the electrode terminal member 20a is bent with the first surface 21 facing inward. The bending position is determined according to the shape of the electrode terminal 20 (see FIG. 1) when it is attached to the power storage device 100. In this embodiment, the electrode terminal member 20a is bent along the grooves 23 and 24.

[0026] While pressing a part of the first surface 21, the electrode terminal member 20a is bent at a predetermined position. In this embodiment, the electrode terminal member 20a is bent at the grooves 23 and 24. As shown in FIG. 5, the electrode terminal member 20a may be bent using a jig 50.

[0027] The jig 50 has a shape corresponding to the outer shape of the electrode terminal member 20a after bending. The jig 50 includes a first jig 51 and a second jig 52. The first jig 51 and the second jig 52 are substantially rectangular parallelepiped-shaped. The first jig 51 and the second jig 52 each have opposing surfaces 51a, 52a that face each other. A space 50a is formed between the opposing surfaces 51a, 52a. In other words, the space 50a is sandwiched between the opposing surfaces 51a, 52a. The opposing surfaces 51a, 52a are substantially parallel. The height of the first jig 51 and the second jig 52 is slightly larger than the dimension in the long side direction of the first parts 21a, 22a of the electrode terminal member 20a. The distance between the first jig 51 and the second jig 52 is substantially the same as the dimension in the long side direction of the second parts 21b, 22b of the electrode terminal member 20a. The width of the first jig 51 and the second jig 52 along the depth direction of the paper is larger than the dimension in the short side direction of the electrode terminal member 20a. Note that the dimensions and shape of the jig 50 are not particularly limited.

[0028] The first part 22a and the third part 22c of the second surface 22 of the electrode terminal member 20a are placed on the upper surfaces 51b, 52b of the first jig 51 and the second jig 52, respectively. The second part 22b of the second surface 22 is arranged to overlap with the space 50a. The grooves 23, 24 of the electrode terminal member 20a may be inside the thickness of the electrode terminal member 20a by the thickness of the electrode terminal member 20a from the edges of the upper surfaces 51b, 52b of the first jig 51 and the second jig 52, respectively.

[0029] With the electrode terminal member 20a placed on the jig 50, the second part 21b that overlaps with the space 50a in the vertical direction is pushed. Here, with the first part 21a and the third part 21c of the second surface 22 supported by the first jig 51 and the second jig 52, respectively, the pressing member 55 is applied to the bottom of the recess 25 formed in the second part 21b and pushed downward. The pressing member 55 can be a rod-shaped member. The pressing member 55 may be attached to a pressing device (not shown). The shape of the portion of the pressing member 55 that is applied to the bottom of the recess 25 is substantially circular. Note that the shape of the portion of the pressing member 55 that is applied to the bottom of the recess 25 is preferably set according to the planar shape of the recess 25 and is not particularly limited. The recess 25 positions the pressing member 55. Thereby, the force applied when bending the electrode terminal member 20a can be stabilized.

[0030] As shown in FIG. 6, the concave portion 25 of the second portion 21b of the first surface 21 is pressed by the pressing member 55, and the electrode terminal member 20a is bent. Here, it is bent at two locations along the grooves 23 and 24 sandwiching a part (second portion 21b) of the first surface 21 pressed by the pressing member 55. As the pressing member 55 descends, the electrode terminal member 20a is inserted into the space 50a together with the pressing member 55. At this time, the electrode terminal member 20a deforms along the jig 50. The electrode terminal member 20a bends substantially vertically along the grooves 23 and 24. The first portion 22a and the third portion 22c of the second surface 22 of the electrode terminal member 20a are along the opposing surfaces 51a and 52a of the first jig 51 and the second jig 52, respectively. The first portion 21a and the third portion 21c of the first surface 21 that have been rough-machined face each other within the space 50a. The first portions 21a, 22a and the third portions 21c, 22c are substantially parallel to each other. Thereby, the electrode terminal 20 is prepared. In this embodiment, the electrode terminal 20 is substantially U-shaped when viewed from the side. The electrode terminal 20 is taken out from the jig 50 and arranged in the mold 60 (see FIG. 7) together with the plate member 14a (see FIG. 3).

[0031] <Process S40 of arranging the electrode terminal 20 and the plate member 14a in the mold 60> In the process S40 of arranging the electrode terminal 20 and the plate member 14a in the mold 60, as shown in FIG. 7, with the electrode terminal 20 inserted through the through-hole 14b of the plate member 14a, the electrode terminal 20 and the plate member 14a are arranged in the mold 60. At this time, the electrode terminal 20 and the plate member 14a are arranged in the mold 60 so that they do not contact each other.

[0032] The configuration of the mold 60 can be appropriately set according to 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 lower mold 61 is a mold on which the plate member 14a and the electrode terminal 20 are disposed. The lower mold 61 includes an upper surface 62 on which the plate member 14a is placed, and a recess 63 that is recessed downward from the upper surface 62. The upper mold 66 includes a lower surface 67 on which the plate member 14a is placed, and a recess 68 that is recessed upward from the lower surface 67. The material of the mold 60 is not particularly limited, and can be constituted by, for example, a high-strength metal material such as a stainless steel type, a die steel type, or a maraging steel type.

[0033] The upper surface 62 of the lower mold 61 is a flat surface along the inner surface 14d of the plate member 14a. The inner surface 14d of the plate member 14a is placed on the upper surface 62. The recess 63 of the lower mold 61 is a portion where the first portions 21a, 22a of the electrode terminal 20 are received. The depth of the recess 63 is deeper than the thickness of the first portions 21a, 22a of the electrode terminal 20. The first portion 22a of the second surface 22 of the electrode terminal 20 is placed on the bottom surface 63a of the recess 63. The bottom surface 63a and the side surface 63b of the recess 63 are shaped along the first portions 21a, 22a of the electrode terminal 20. In this embodiment, an R is formed along the electrode terminal 20 from the bottom surface 68a to the side surface 68b. A step is provided at the upper portion (opening end side) of the side surface 63b of the recess 63. At the upper portion of the side surface 63b of the recess 63, a portion 63b1 that is recessed outward in the circumferential direction from the side surface 63b is formed. The recessed portion 63b1 is continuous in the circumferential direction of the recess 63. Therefore, the recessed portion 63b1 at the upper portion of the recess 63 is slightly larger than the first portions 21a, 22a of the electrode terminal 20. Among the recess 63, the recessed portion 63b1 functions as a cavity surface 63b1 in a subsequent integral molding process.

[0034] The upper mold 66 is formed smaller than the lower mold 61 in the long side direction of the plate member 14a. The lower surface 67 of the upper mold 66 is a flat surface along the outer surface 14c of the plate member 14a. The lower surface 67 is placed on the outer surface 14c of the plate member 14a. The recess 68 of the upper mold 66 is a part where the third parts 21c, 22c of the electrode terminals 20 are received. The depth of the recess 68 is deeper than the thickness of the third parts 21c, 22c of the electrode terminals 20. The third part 22c of the second surface 22 of the electrode terminal 20 is applied to the bottom surface 68a of the recess 68. The bottom surface 68a and the side surface 68b of the recess 68 are shaped along the third parts 21c, 22c of the electrode terminal 20. In this embodiment, an R part along the electrode terminal 20 is formed from the bottom surface 68a toward the side surface 68b. A step is provided at the lower part (opening end side) of the side surface 68b of the recess 68. At the lower part of the side surface 68b of the recess 68, a recessed part 68b1 that is recessed from the side surface 68b toward the outer side in the circumferential direction is formed. The recessed part 68b1 is continuous in the circumferential direction of the recess 68. Therefore, the recessed part 68b1 at the upper part of the recess 68 is slightly larger than the third parts 21c, 22c of the electrode terminal 20. Among the recess 68, the recessed part 68b1 functions as a cavity surface 68b1 in a subsequent integral molding process. The upper mold 66 is provided with an injection hole 69. The injection hole 69 penetrates from the upper surface 66a of the upper mold 66 to the recessed part 68b1 of the recess 68. Note that the position of the injection hole 69 is not particularly limited. The injection hole 69 may be formed, for example, so as to penetrate the side surface 68b of the recess 68 of the upper mold 66, or may be formed so as to penetrate the side surface 63b of the recess 63 of the lower mold 61.

[0035] The procedure for arranging the electrode terminal 20 and the plate member 14a in the mold 60 is not particularly limited. For example, the electrode terminal 20 and the plate member 14a may be arranged in the mold 60 according to the following procedure. The first part 22a of the second surface 22 of the electrode terminal 20 is arranged in the recess 63 of the lower mold 61. With the through hole 14b aligned so as to overlap the third parts 21c, 22c of the electrode terminal 20, the inner surface 14d of the plate member 14a is arranged on the upper surface 62 of the lower mold 61. The lower surface 67 of the upper mold 66 is placed on the outer surface 14c of the plate member 14a so that the third part 22c of the second surface 22 of the electrode terminal 20 fits into the recess 68 of the upper mold 66.

[0036] At this time, it is arranged in the mold 60 so that a gap G is formed between the first surface 21 of the electrode terminal 20 and the plate member 14a. In this embodiment, since the recesses 63 and 68 are deeper than the first portions 21a and 22a and the second portions 21b and 22b, respectively, the first portion 21a and the third portion 21c of the first surface 21 have a gap G with respect to the inner surface 14d and the outer surface 14c of the plate member 14a, respectively. The gap G is provided in a space surrounded by the recess 63 of the lower mold 61, the recess 68 of the upper mold 66, the plate member 14a, and the electrode terminal 20. The second portions 21b and 22b pass through the through holes 14b and are not in contact with the plate member 14a. Next, resin 31 (see FIG. 8) is poured into the mold 60 in which the electrode terminal 20 and the plate member 14a are arranged.

[0037] <Process S50 of integrally molding the plate member 14a, the electrode terminal 20, and the sealing material 30> In the process S50 of integrally molding the plate member 14a, the electrode terminal 20, and the sealing material 30, as shown in FIG. 8, resin 31 is poured into the mold 60 in which the electrode terminal 20 and the plate member 14a are arranged. The electrode terminal 20 and the plate member 14a are joined via the sealing material 30 by so-called injection molding. Here, the resin 31 is poured from the injection hole 69 of the upper mold 66. The resin 31 flows into a space surrounded by the recess 63 of the lower mold 61, the recess 68 of the upper mold 66, the plate member 14a, and the electrode terminal 20. The resin 31 flows into the periphery of the electrode terminal 20 in the plane direction of the plate member 14a, the gap G between the electrode terminal 20 and the plate member 14a, and the gap between the opposing first portion 21a and the third portion 21c.

[0038] As the resin 31, thermoplastic resins such as polyethylene, polyamide, polypropylene, and vinyl chloride resin can be used. After the injection of the resin 31, the mold 60 is cooled, and thereby the resin 31 is also cooled. The cooled resin 31 hardens to form the sealing material 30. As a result, the gap G between the first surface 21 of the electrode terminal 20 and the plate member 14a is filled with the sealing material 30. As a result, the plate member 14a, the electrode terminal 20, and the sealing material 30 are integrally molded, and the case component 14 is manufactured.

[0039] Since the rough surface portions 21a to 21c of the first surface 21 have a large surface roughness, the resin 31 easily enters the surfaces of the rough surface portions 21a to 21c. The resin 31 cures in a state of entering the surfaces of the rough surface portions 21a to 21c. As a result, the bonding strength between the cured sealing material 30 and the electrode terminal 20 is likely to be improved by the so-called anchor effect.

[0040] Note that the plate member 14a and the electrode terminal 20 are arranged in the mold 60 so as not to contact each other. Therefore, in the case part 14, the sealing material 30 is interposed between the plate member 14a and the electrode terminal 20. Thereby, the interference between the plate member 14a and the electrode terminal 20 is suppressed.

[0041] By the way, when forming a case part by integrally molding an electrode terminal, a plate member, and a sealing material, in order to improve the bonding strength with the sealing material, the electrode terminal member may be roughened. By widely roughening the electrode terminal, the bonding strength with the sealing material can be further improved. However, depending on the shape of the electrode terminal, it may be difficult to widely roughen the electrode terminal. According to the findings of the present inventor, when the surface in contact with the sealing material enters inward, it may be difficult to increase the area to be roughened. For example, when roughening by laser irradiation, the processing surface is difficult to aim at. When roughening by chemical etching, an additional process such as covering the portion where roughening is not required is necessary to prevent the portion where roughening is not required from being processed.

[0042] In the above-described embodiment, the manufacturing method of the case component 14 includes a step S10 of preparing the plate member 14a, a step S20 of preparing the electrode terminal member 20a, a step S30 of preparing the electrode terminal 20, a step S40 of arranging the electrode terminal 20 and the plate member 14a in the mold 60, and a step S50 of integrally molding the plate member 14a, the electrode terminal 20, and the sealing material 30. A through-hole 14b is formed in the plate member 14a prepared in the step S10 of preparing the plate member 14a. In the step S30 of preparing the electrode terminal 20, the electrode terminal member 20a is bent at a predetermined position with the first surface 21 facing inward. In the step S40 of arranging in the mold 60, the electrode terminal 20 and the plate member 14a are arranged in the mold 60 so that a gap G is formed between the first surface 21 of the electrode terminal 20 and the plate member 14a. In the step S50 of integrally molding, the resin 31 is poured into the mold 60 to integrally mold the plate member 14a, the electrode terminal 20, and the sealing material 30. In the step S50 of integrally molding, the gap G is filled.

[0043] In such a manufacturing method, the first surface 21 of the electrode terminal member 20a is roughened, and then the electrode terminal member 20a is bent into the shape of the electrode terminal 20. During the roughening process, since the electrode terminal member 20a is in the shape before bending, it is easy to perform roughening regardless of the processing method, and a wide area of the first surface 21 can be roughened. Also, after roughening, the electrode terminal 20 can be obtained simply by bending the electrode terminal member 20a. Therefore, when processing the electrode terminal member 20a into the shape of the electrode terminal 20, it is difficult for the roughened portion of the first surface 21 to be affected, and the roughened portion (roughened portion 14a1) is likely to be maintained. As a result, the bonding property between the electrode terminal 20 and the sealing material 30 after integral molding is good.

[0044] In the above-described embodiment, in the step S30 of preparing the electrode terminal 20, while pressing a part (second part 21b) of the first surface 21, the electrode terminal member 20a is bent at a predetermined position. Since only a part of the first surface 21 is pressed to bend the electrode terminal member 20a, the influence on the roughened portion can be reduced.

[0045] In the above-described embodiment, in step S30 of preparing the electrode terminal 20, two locations sandwiching a part of the first surface 21 to be pressed are bent, and the roughened first surfaces 21 are opposed to each other. According to such a manufacturing method, the roughened first surfaces 21 can be opposed to each other while suppressing the influence on the roughened portions to a small extent. Thereby, the electrode terminal 20 and the sealing material 30 can be joined more firmly.

[0046] In the above-described embodiment, in step S30 of preparing the electrode terminal 20, grooves 23 and 24 are formed on the first surface 21 of the electrode terminal member 20a along a predetermined position where the electrode terminal member 20a is to be bent. Thereby, the electrode terminal member 20a can be easily bent, and deformation due to bending can be suppressed.

[0047] In the above-described embodiment, in step S20 of preparing the electrode terminal member 20a, the first surface 21 is roughened by laser irradiation. By roughening by laser irradiation, it is easy to process a wide area of the first surface 21. Also, processes such as coating and removal during processing are unnecessary. For this reason, the mass productivity of the case part 14 is good.

[0048] The case part 14 manufactured by the above manufacturing method can be used as the lid 14 of the power storage device 100. Also, a power storage device 100 can be manufactured by accommodating an electrode body in the case body 12 and sealing the opening of the case body 12 with the lid 14 by a known method.

[0049] Note that the case part 14 is not limited to the above-described form. When an electrode terminal and a sealing material are provided on the case body, a case part as the case body may be manufactured by the above-described method.

[0050] The technologies disclosed herein have been variously described. Unless otherwise specified, the embodiments listed herein do not limit the present invention. Further, the technologies disclosed herein can be variously modified, and each component and each process mentioned herein can be appropriately omitted or appropriately combined as long as no particular problem occurs. Further, this specification includes the disclosures described in the following items.

[0051] Item 1: A step of preparing a plate member having a through hole formed therein; A step of preparing a plate-like electrode terminal member having a rough surface on a first surface, which is inserted into the through hole; A step of preparing a bent electrode terminal by bending the electrode terminal member with the first surface facing inward at a predetermined position; A step of arranging the electrode terminal and the plate member in a mold with the electrode terminal inserted into the through hole; A step of pouring resin into the mold to integrally mold the plate member, the electrode terminal, and a sealing material; including In the step of arranging in the mold, the electrode terminal and the plate member are arranged in the mold so that a gap is formed between the first surface of the electrode terminal and the plate member; In the step of integrally molding, the gap is filled with the sealing material. A method for manufacturing a case component for a power storage device.

[0052] Item 2: In the step of preparing the electrode terminal, the electrode terminal member is bent at the predetermined position while pressing a part of the first surface, the method for manufacturing a case component for a power storage device according to Item 1.

[0053] Item 3: In the step of preparing the electrode terminal, two portions sandwiching the part of the first surface to be pressed are bent so that the rough first surfaces face each other, the method for manufacturing a case component for a power storage device according to Item 2.

[0054] Item 4: In the step of preparing the electrode terminal member, a groove is formed along the predetermined position where the electrode terminal member is to be bent on the first surface of the electrode terminal member, the manufacturing method of the case component for a power storage device according to any one of claims 1 to 3.

[0055] Item 5: In the step of preparing the electrode terminal member, the first surface is roughened by laser irradiation, the manufacturing method of the case component for a power storage device according to any one of claims 1 to 4.

[0056] Item 6: A plate-shaped plate member in which a through hole is formed, A plate-shaped electrode terminal inserted into the through hole of the plate member, A sealing material interposed between the plate member and the electrode terminal and comprising The first surface of the electrode terminal has a roughened portion, Between the roughened portion on the first surface of the electrode terminal and the plate member, it is filled with the sealing material. Case component for a power storage device.

[0057] Item 7: The electrode terminal is bent at two locations such that the first surfaces face each other, the case component for a power storage device according to claim 6.

[0058] Item 8: An electrode body, A case body having an opening and accommodating the electrode body, A lid attached to the opening and comprising The case body or the lid is a case component for a power storage device according to claim 6 or 7. Power storage device.

Explanation of Signs

[0059] G Gap 10 Case 12 Case body 14 Case component (lid) 14a Plate member 14a1 Rough surface processing part 14b Through hole 14c Outer surface 14d Inner surface 14e External groove 20 Electrode terminal 20a Electrode terminal member 21 First surface 21a, 22a First part 21b, 22b Second part 21c, 22c Third part 21a~21c Rough surface processing part 22 Second surface 23, 24 Groove 25 Concave part 30 Sealing material 31 Resin 50 Fixture 50a Space 51a, 52a Opposite surface 51b, 52b Upper surface 55 Member 60 Mold 61 Lower mold 62 Upper surface 63, 68 Concave part 63a, 68a Bottom surface 63b, 68b Side surface 63b1, 68b1 Depressed part (cavity surface) 66 Upper mold 66a Upper surface 67 Lower surface 69 Injection hole 100 Energy storage device

Claims

1. A step of preparing a plate member having a through hole formed therein; A step of preparing a plate-like electrode terminal member having a rough surface on a first surface thereof and inserted into the through hole; A step of preparing a bent electrode terminal by bending the electrode terminal member with the first surface facing inward at a predetermined position; A step of arranging the electrode terminal and the plate member in a mold with the electrode terminal inserted into the through hole; A step of pouring resin into the mold to integrally mold the plate member, the electrode terminal, and a sealing material; comprising: In the step of arranging in the mold, the electrode terminal and the plate member are arranged in the mold such that a gap is formed between the first surface of the electrode terminal and the plate member; In the step of integrally molding, the gap is filled with the sealing material; A method for manufacturing a case component for a power storage device.

2. In the step of preparing the electrode terminal, the electrode terminal member is bent at the predetermined position while pressing a part of the first surface, the method for manufacturing a case component for a power storage device according to Claim 1.

3. In the step of preparing the electrode terminal, two portions sandwiching the part of the first surface to be pressed are bent so that the rough first surfaces face each other, the method for manufacturing a case component for a power storage device according to Claim 2.

4. In the step of preparing the electrode terminal member, a groove is formed on the first surface of the electrode terminal member along the predetermined position where the electrode terminal member is bent, the method for manufacturing a case component for a power storage device according to any one of Claims 1 to 3.

5. In the step of preparing the electrode terminal member, the first surface is roughened by laser irradiation, the method for manufacturing a case component for a power storage device according to any one of Claims 1 to 3.

6. A plate-like plate member having a through hole formed therein; A plate-like electrode terminal inserted into the through hole of the plate member; A sealing material interposed between the plate member and the electrode terminal; comprising: The first surface of the electrode terminal has a roughened portion; Between the roughened portion of the first surface of the electrode terminal and the plate member is filled with the sealing material; A case component for a power storage device.

7. The electrode terminal is bent at two locations such that the first surfaces face each other, the case component for a power storage device according to Claim 6.

8. An electrode body; A case body having an opening and accommodating the electrode body; A lid attached to the opening; comprising: The case body or the lid is a case component for a power storage device according to claim 6 or 7, Power storage device.

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