Manufacturing method of battery

Abstract

To provide a manufacturing method of a battery, capable of stably manufacturing a battery with high quality.SOLUTION: A manufacturing method of a battery 1 includes a resin material molding step of forming a resin material 40 by an insert molding while holding a lid body 10 and a terminal member 20 by an upper mold 110 and a lower mold 120. The terminal member 20 includes a plate board part 21 that is positioned to an outside of an outer casing body 2, and extends along an outer surface 11 of the lid body 10, and also includes a first inner and outer part 22 and a second inner and outer part 23 that extend to an inner side of the outer casing body 2 while passing through an inner part space of a penetration hole 13 of the lid body 10 from the plate board part 21. In the resin material molding step, an outer side surface 21A of the plate board part 21 is adhered to the upper mold 110, and an inner side surface 22A of the first inner and outer part 22 and an inner side surface 23A of the second inner and outer part 23 are brought into contact with the lower mold 120. Thus, the terminal member 20 is held so as to penetrate the penetration hole 13 of the lid body 10, and a molten resin is implanted into a cavity 101 in such a state, and thus, the resin material 40 is formed.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The disclosed technology relates to a method for manufacturing a battery having a terminal member that passes through a through hole in an exterior body and is provided on both the inside and outside of the exterior body, and a resin material that is joined to the terminal member and the exterior body. [Background technology]

[0002] A part of the terminal part of the battery is exposed outside the battery case. The terminal part is electrically connected to an electrode plate provided inside the battery case on the inside side of the battery case. The terminal member constituting such a terminal part may be provided on both the inside and the outside of the battery case. The terminal member may be fixed by being joined with a resin material at a through hole formed in the battery case, as disclosed in Patent Document 1, for example. Patent Document 1 describes that the resin material is formed by insert molding in which molten resin is filled between the battery case and the terminal part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-86245 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional technology, the terminal member has a shape in which the portion located outside the exterior body is bent in a direction along the outer surface of the exterior body relative to the portion penetrating the inside of the through hole of the exterior body. Of the portion of the terminal member located outside the exterior body, the outer surface facing the outside of the exterior body is exposed to the outside of the exterior body. This exposed surface is generally a terminal surface to which another conductive member is connected.

[0005] In insert molding, the molten resin is generally filled into the mold at high pressure. The molten resin filled into the mold at high pressure may get into the gap between the terminal surface of the terminal member and the mold. If the molten resin gets into the gap between the terminal surface of the terminal member and the mold, the terminal surface of the terminal member will be covered with the resin. If the terminal surface of the terminal member is covered with resin, there is a risk that the battery cannot be properly charged and discharged through the terminal surface. In other words, there is a possibility that high-quality batteries cannot be stably manufactured.

[0006] The present disclosure has been made to solve the problems of the conventional techniques described above. That is, the object of the disclosure is to provide a method for manufacturing a battery that can stably manufacture high-quality batteries. [Means for solving the problem]

[0007] The disclosed technology is a manufacturing method for a battery having an exterior body with a through hole formed therein, a terminal member provided on the inside and outside of the exterior body by penetrating the through hole, and a resin material joined to the terminal member and the exterior body, the manufacturing method including a resin material molding step of forming the resin material by insert molding while holding the exterior body and the terminal member in a molding die, and in the resin material molding step, the terminal member is formed by insert molding a flat plate portion located on the outside of the exterior body and extending along the outer surface of the exterior body, a first inner / outer portion and a second inner / outer portion extending from the flat plate portion through the internal space of the through hole to the inside of the exterior body, A battery manufacturing method includes using a flat outer surface of the flat portion facing the outside of the exterior body, with a first inner / outer surface and a second inner / outer surface spaced apart, and while the first inner surface of the first inner / outer surface facing the inside of the exterior body and the second inner surface of the second inner / outer surface facing the inside of the exterior body are brought into contact with an inner surface of the mold located on the inside of the exterior body, holding the terminal member so that it passes through the through hole, and in this state, injecting molten resin into the cavity of the mold to form a resin material.

[0008] In the battery manufacturing method according to the above aspect, it is possible to prevent the molten resin injected into the cavity from entering between the flat plate portion of the terminal member and the mold and covering the flat plate outer surface of the flat plate portion. In other words, the resin material can be formed while appropriately exposing the flat plate outer surface of the flat plate portion. This allows the battery to be appropriately charged and discharged using the exposed flat plate outer surface of the flat plate portion. Therefore, the battery manufacturing method according to this aspect can stably manufacture high-quality batteries. Effect of the Invention

[0009] According to the disclosed technique, a battery manufacturing method capable of stably manufacturing high-quality batteries is provided. [Brief description of the drawings]

[0010] [Figure 1] 1 is an external perspective view of a battery according to an embodiment; [Diagram 2] 2 is a cross-sectional view of a terminal portion of a battery according to an embodiment. FIG. [Diagram 3] FIG. 2 is a perspective view of a terminal member and a current collecting member of the battery according to the embodiment. [Figure 4] 3A and 3B are diagrams showing a molding die used in manufacturing a battery according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. A battery 1 according to this embodiment is, as shown in FIG. 1, a battery in which an electrode assembly 3 is housed inside an exterior body 2. The electrode assembly 3 is formed by stacking a positive electrode plate 3A and a negative electrode plate 3B with a separator 3C sandwiched between them. The exterior body 2 is composed of a box body 4 and a lid body 10. In this embodiment, the box body 4 and the lid body 10 constituting the exterior body 2 are both made of conductive metal. An electrolyte solution 5 is housed inside the exterior body 2.

[0012] The battery 1 of this embodiment has an overall flat rectangular shape. Figure 1 shows the X, Y, and Z directions. For the battery 1 having a flat rectangular shape, the longitudinal direction of the lid 10 is the X direction, the lateral direction of the lid 10 is the Y direction, and the height direction of the battery 1 is the Z direction. Positive and negative terminals 6, 7 are provided near both ends of the lid 10 on the top of the battery 1 in the longitudinal direction.

[0013] In each of the terminal sections 6 and 7, a terminal member 20 constituting an external terminal of the battery 1 is attached to the lid body 10 via an insulating material. The terminal member 20 is provided on both the inside and outside of the exterior body 2, penetrating the lid body 10, and is attached to the lid body 10 by crimping one end side. Each of the terminal sections 6 and 7 is electrically connected inside the exterior body 2 to either the positive electrode plate 3A or the negative electrode plate 3B constituting the electrode body 3.

[0014] When viewed from the outside of battery 1, terminal surfaces 6A and 7A are visible at the locations of terminal portions 6 and 7, respectively. Terminal surfaces 6A and 7A are surfaces to which other metal members that form current paths for charging and discharging battery 1 are connected. This allows battery 1 to be charged or discharged via terminal portions 6 and 7.

[0015] Fig. 2 is a cross-sectional view at the position of terminal portion 6 of battery 1. The left-right direction in Fig. 2 is the short-side direction of lid body 10. As shown in Fig. 2, battery 1 has, in addition to terminal member 20, a current collecting member 30 and a resin material 40 as members constituting the periphery of terminal portion 6. Terminal portion 7 can also have the same configuration as terminal portion 6.

[0016] The lid body 10 has an outer surface 11 and an inner surface 12 as end faces in the thickness direction. In FIG. 2 , the side below the inner surface 12 of the lid body 10 is the inside of the exterior body 2. The lid body 10 is formed with a through hole 13 penetrating in the thickness direction. A terminal member 20 is provided inside the through hole 13. A resin material 40 is provided between the lid body 10 and the terminal member 20. The resin material 40 is bonded to the lid body 10 and the terminal member 20.

[0017] The terminal member 20 is made of a conductive metal. The specific material of the terminal member 20 can be determined, for example, depending on whether the terminal member 20 constitutes a positive electrode or a negative electrode. The terminal member 20 has a flat plate portion 21, a first inner and outer portion 22, and a second inner and outer portion 23.

[0018] The flat plate portion 21 is a flat plate-like portion extending along the outer surface 11 of the lid body 10. The flat plate portion 21 is located outside the outer surface 11 of the lid body 10. The flat plate portion 21 has an outer surface 21A and an inner surface 21B as surfaces. The outer surface 21A is the surface of the flat plate portion 21 facing the outside of the exterior body 2. The outer surface 21A is not covered by the resin material 40. The outer surface 21A exposed to the outside of the exterior body 2 is the terminal surface 6A of the terminal portion 6 of the battery 1. The inner surface 21B is the reverse side of the outer surface 21A, and is the surface of the flat plate portion 21 facing the inside of the exterior body 2.

[0019] Both the first inner / outer part 22 and the second inner / outer part 23 are parts that extend from the flat plate part 21 through the internal space of the through hole 13 of the lid body 10 to the inside of the exterior body 2. The first inner / outer part 22 and the second inner / outer part 23 in this embodiment are connected to both ends of the flat plate part 21 in the direction along the outer surface 21A of the flat plate part 21. FIG. 3 is a perspective view of the terminal member 20 and the current collecting member 30. As shown in FIG. 3, the first inner / outer part 22 and the second inner / outer part 23 in this embodiment are flat plate-shaped. The flat plate-shaped first inner / outer part 22 and the second inner / outer part 23 are provided opposite each other with a gap therebetween.

[0020] As shown in FIG. 2, the first inner / outer part 22 has an inner surface 22A facing the inside of the exterior body 2 inside the exterior body 2. The second inner / outer part 23 has an inner surface 23A facing the inside of the exterior body 2 inside the exterior body 2. The inner surface 22A of the first inner / outer part 22 and the inner surface 23A of the second inner / outer part 23 are not covered with the resin material 40 and are exposed inside the exterior body 2. In this embodiment, the inner surface 22A of the first inner / outer part 22 and the inner surface 23A of the second inner / outer part 23 are provided on the same plane. In addition, the inner surface 22A of the first inner / outer part 22 and the inner surface 23A of the second inner / outer part 23 in this embodiment are both parallel to the outer surface 21A of the flat plate part 21.

[0021] The first inner / outer part 22 is provided with an uncoated part 25 that is not covered with the resin material 40. The uncoated part 25 in this embodiment is a part that protrudes further inwardly of the exterior body 2 than the inner surface 22A of the first inner / outer part 22. A current collecting member 30 is connected to an uncoated surface 25A of the surface of the uncoated part 25. Note that a part such as the uncoated part 25 is not provided on the second inner / outer part 23 side. The terminal member 20 in this embodiment can be formed by sheet metal processing.

[0022] The current collecting member 30 is made of a conductive metal. The specific material of the current collecting member 30 can be determined, for example, depending on whether it constitutes a positive electrode or a negative electrode. The current collecting member 30 is a member that electrically connects the terminal member 20 and the electrode body 3. The current collecting member 30 has a terminal connection portion 31.

[0023] The terminal connection portion 31 is joined by welding to the uncovered surface 25A of the uncovered portion 25 of the terminal member 20. As shown in Fig. 3, the current collecting member 30 has an electrode body connection portion 32 at the end opposite to the terminal connection portion 31. The electrode body connection portion 32 is a portion to which the electrode body 3 is connected. The current collecting member 30 of this embodiment can be formed by sheet metal processing.

[0024] The resin material 40 is a resin having elasticity and insulating properties. The resin material 40 is also a resin having resistance to the electrolyte 5. The resin material 40 of this embodiment is a composite resin in which a filler is mixed with a base resin. For example, polyphenylene sulfide resin (PPS) can be used as the base resin. For example, glass can be used as the filler. The resin material 40 is formed by insert molding together with the lid 10 and the terminal member 20.

[0025] The resin material 40 has, as its surfaces, an outer main surface 41, an outer side surface 42, an inner main surface 43, and an inner side surface 44. The outer main surface 41 and the outer side surface 42 are located outside the exterior body 2. In this embodiment, the outer main surface 41 of the resin material 40 is flush with the outer surface 21A of the terminal member 20.

[0026] As described above, the resin material 40 is bonded to the lid body 10 and the terminal member 20. As a result, the terminal member 20 is fixed at the location of the through hole 13 of the lid body 10, as shown in Fig. 2. The resin material 40 also fills the gap between the inner wall 14 of the through hole 13 and the terminal member 20. As a result, the resin material 40 seals the exterior body 2 at the location of the through hole 13.

[0027] Next, a manufacturing method of the battery 1 will be described. The battery 1 of this embodiment can be manufactured by assembling the lid body 10 to the box body 4 to form the exterior body 2. The electrolyte 5 is contained inside the exterior body 2. For this reason, the exterior body 2 may be provided with an inlet for the electrolyte 5 as appropriate. In addition, the terminal parts 6, 7 are provided on the lid body 10 before it is assembled to the box body 4, and the electrode body 3 is assembled thereto. That is, in the manufacturing process of the battery 1, a process of forming the terminal parts 6, 7 is performed on the lid body 10. In this embodiment, the manufacturing process of the battery 1 includes a resin material forming process of forming the resin material 40 at the through hole 13 of the lid body 10, and a joining process of joining the current collecting member 30 to the terminal member 20. The joining process is a process performed after the resin material forming process.

[0028] In the resin molding process, the lid 10 and the terminal member 20 are held by a molding die, and the resin 40 is formed by insert molding. FIG. 4 shows a cross-sectional view of a molding apparatus 100 used in the resin molding process. The molding apparatus 100 has an upper die 110 and a lower die 120 as molding dies. FIG. 4 shows a closed state in which the upper die 110 and the lower die 120 are closed. In the molding apparatus 100, when the die is opened, the upper die 110 moves away from the lower die 120. When the die is closed, the upper die 110 moves toward the lower die 120. It is also possible to open and close the molding apparatus 100 by moving the lower die 120.

[0029] The upper mold 110 is a molding mold that molds a portion of the resin material 40 that is closer to the exterior of the exterior body 2 than the outer surface 11 of the lid 10. The upper mold 110 has an outer main surface molding surface 111 and an outer side surface molding surface 112 as molding surfaces that mold the resin material 40. The outer main surface molding surface 111 is a molding surface that molds the outer main surface 41 of the resin material 40. The outer side surface molding surface 112 is a molding surface that molds the outer side surface 42.

[0030] The lower die 120 is a molding die for molding a portion of the resin material 40 that is closer to the inside of the exterior body 2 than the inner surface 12 of the lid body 10. The lower die 120 has an inner main surface molding surface 121 and an inner side surface molding surface 122 as molding surfaces for molding the resin material 40. The inner main surface molding surface 121 is a molding surface for molding the inner main surface 43 of the resin material 40. The inner side surface molding surface 122 is a molding surface for molding the inner side surface 44. The lower die 120 is also provided with a lid body installation portion 125 for installing the lid body 10. Furthermore, the lower die 120 is formed with a non-covered insertion portion 126 for inserting the non-covered portion 25 of the terminal member 20.

[0031] When the molding apparatus 100 is in a mold closed state, a cavity 101 into which molten resin forming the resin material 40 is injected is formed between the upper mold 110 and the lower mold 120. The cavity 101 is a space surrounded by the molding surfaces of the upper mold 110 and the lower mold 120. An injection path 115 is formed in the molding mold. The molten resin is injected by passing through the injection path 115 and being injected into the cavity 101. In the molding apparatus 100 of this embodiment, the injection path 115 is provided in the upper mold 110 and opens to the outer main molding surface 111.

[0032] In the mold closed state, the molding apparatus 100 can hold the lid body 10 and the terminal member 20 by sandwiching them between the upper mold 110 and the lower mold 120. In the mold closed state of the molding apparatus 100, the lid body 10 arranged on the lid body installation section 125 is held by being sandwiched near the parting surface between the upper mold 110 and the lower mold 120.

[0033] In the mold closing state of the molding apparatus 100, the terminal member 20 is held by being sandwiched between the outer main surface molding surface 111 of the upper mold 110 and the inner main surface molding surface 121 of the lower mold 120. That is, the outer main surface molding surface 111 of the upper mold 110 is provided with a contact area 111A that contacts the outer side surface 21A of the flat plate portion 21 of the terminal member 20. The inner main surface molding surface 121 of the lower mold 120 is provided with contact areas 121A and 121B that contact the inner side surface 22A of the first inner and outer parts 22 and the inner side surface 23A of the second inner and outer parts 23 of the terminal member 20, respectively. Both of the contact areas 121A and 121B in this embodiment are areas located within the inner main surface molding surface 121 of the lower mold 120. That is, the contact areas 121A and 121B are different areas on one plane.

[0034] An outer side surface 21A of the flat plate portion 21 of the terminal member 20 is in close contact with a contact region 111A of the outer main surface molding surface 111 of the upper mold 110. Also, an inner side surface 22A of the first inner / outer surface 22 and an inner side surface 23A of the second inner / outer surface 23 of the terminal member 20 are in contact with contact regions 121A, 121B of the inner main surface molding surface 121 of the lower mold 120, respectively. As a result, the terminal member 20 is held so as to pass through the through hole 13 of the lid 10.

[0035] In the resin molding process, first, with the molding apparatus 100 in an open state, the lid 10 and the terminal member 20 are placed on the lower mold 120. The lid 10 is placed on the lid placement portion 125 of the lower mold 120. The terminal member 20 is placed so that the inner surface 22A of the first inner / outer portion 22 and the inner surface 23A of the second inner / outer portion 23 are in contact with the contact regions 121A and 121B of the inner main molding surface 121 of the lower mold 120, respectively. At this time, the non-coated portion 25 of the terminal member 20 is inserted into the non-coated insertion portion 126 of the lower mold 120.

[0036] After placing the lid body 10 and the terminal member 20 on the lower die 120, the molding apparatus 100 is closed. In the closed state, the lid body 10 and the terminal member 20 are sandwiched and held between the upper die 110 and the lower die 120. In other words, the outer surface 21A of the flat plate portion 21 of the terminal member 20 is in close contact with the contact area 111A of the outer main molding surface 111 of the upper die 110.

[0037] After the mold is closed, molten resin is injected into the cavity 101. The molten resin injected into the cavity 101 fills the cavity 101. As a result, the molten resin covers the surfaces of the lid 10 and the terminal member 20 exposed in the cavity 101. That is, the outer side surface 21A of the terminal member 20 is in close contact with the outer main molding surface 111 of the upper mold 110 and is therefore not covered with the molten resin. In addition, the non-covered portion 25 is inserted into the non-covered insertion portion 126 of the lower mold 120 and is therefore not covered with the molten resin.

[0038] The molten resin filling the cavity 101 is then solidified to form the resin material 40. The solidified resin material 40 is bonded to the lid 10 and the terminal members 20. As a result, in the resin material molding step, a part in which the lid 10, the terminal members 20, and the resin material 40 are integrated can be manufactured. The resin material molding step can be performed, for example, individually for the resin materials 40 of the positive and negative terminal portions 6, 7. Also, for example, the resin material molding step can be performed simultaneously for the resin materials 40 of the terminal portion 6 and the resin materials 40 of the terminal portion 7.

[0039] After the resin molding step, a joining step is performed. In the joining step, the current collecting member 30 is joined to the terminal member 20 in a state where it is assembled to the lid body 10 by the resin material 40. In this embodiment, the terminal connection portion 31 of the current collecting member 30 is overlapped on the non-covered surface 25A of the non-covered portion 25 of the terminal member 20, and the overlapping portion is welded. For example, resistance welding can be used for the welding in the joining step. In the resistance welding, specifically, the overlapping portion of the non-covered portion 25 of the terminal member 20 and the terminal connection portion 31 of the current collecting member 30 is welded by sandwiching the overlapping portion between electrodes from both sides in the thickness direction and applying pressure while passing a current through the overlapping portion. This allows the manufacture of a part in which the lid body 10, the terminal member 20, the resin material 40, and the current collecting member 30 are integrated.

[0040] After the joining step, the electrode body 3 is connected to the electrode body connection portion 32 of the current collecting member 30. Then, the lid 10 connected to the electrode body 3 is assembled into the box 4 to form the exterior body 2, and the electrolyte 5 is accommodated inside the exterior body 2 to manufacture the battery 1.

[0041] Here, in the resin molding process, the molten resin injected under high pressure into the cavity 101 flows near the portion where the flat plate portion 21 of the terminal member 20 and the upper die 110 are in close contact with each other. However, the first inner and outer sides 22 and the second inner and outer sides 23 extending from the flat plate portion 21 of the terminal member 20 are both in contact with the inner main surface molding surface 121 of the lower die 120. In other words, the flat plate portion 21 is supported by the first inner and outer sides 22 and the second inner and outer sides 23 that are spaced apart. This prevents the flat plate portion 21 of the terminal member 20 from separating from the upper die 110 even if the molten resin injected under high pressure flows near the portion where the flat plate portion 21 of the terminal member 20 and the upper die 110 are in close contact with each other. Therefore, the molten resin is prevented from entering between the flat plate portion 21 of the terminal member 20 and the upper die 110. This prevents the molten resin injected into the cavity 101 from covering the outer surface 21A of the flat plate portion 21 of the terminal member 20.

[0042] In this embodiment, the terminal member 20 has the inner surface 22A of the first inner / outer part 22 and the inner surface 23A of the second inner / outer part 23 formed on the same plane. Furthermore, the lower mold 120 has the contact areas 121A and 121B which are different areas on the inner main molding surface 121. Unlike this embodiment, for example, when the contact surfaces of the molding mold which contact the first inner / outer part 22 and the second inner / outer part 23 are formed by processing separately, it is difficult to form these separately processed surfaces on the same plane. This is because they may be formed at different positions in the axial direction of the through hole 13 of the cover 10 due to the tolerance associated with the processing.

[0043] In this embodiment, since the terminal member 20 and the lower die 120 have the above-mentioned configuration, it is possible to prevent the flat plate portion 21 of the terminal member 20 held by the upper die 110 and the lower die 120 from being tilted with respect to the outer main molding surface 111 of the upper die 110. This allows the flat plate portion 21 of the terminal member 20 to be more reliably attached to the upper die 110.

[0044] In addition, in this embodiment, after the resin material molding step, a joining step is performed in which the current collecting member 30 is joined to the non-covered portion 25 of the terminal member 20. Therefore, the terminal member 20 does not have a portion that extends to the electrode body 3, and has a simple shape. The more complex and larger the terminal member 20 is, the more complex the shape and operation of the molding die used in the resin material molding step tends to be. However, the lower die 120 in this embodiment is simple, with only a non-covered insertion portion 126 provided for inserting the non-covered portion 25 of the terminal member 20. Therefore, in this embodiment, the molding device 100 can be made inexpensive. Therefore, the battery 1 can be manufactured inexpensively.

[0045] In addition, in the resin molding step of this embodiment, it is preferable that the terminal member 20 is compressed in the axial direction of the through hole 13 of the lid body 10 by the upper mold 110 and the lower mold 120 in the mold closed state of the molding device 100. By holding the terminal member 20 in this manner, the first inner and outer parts 22 and the second inner and outer parts 23 are compressed in the axial direction of the through hole 13 of the lid body 10. The compression reaction force of the first inner and outer parts 22 and the second inner and outer parts 23 can firmly press the flat plate part 21 of the terminal member 20 against the upper mold 110 and bring them into close contact with each other. This can more reliably prevent the molten resin from entering between the flat plate part 21 of the terminal member 20 and the upper mold 110.

[0046] In this embodiment, the terminal member 20 has an outer surface 21A of the flat portion 21, an inner surface 22A of the first inner / outer portion 22, and an inner surface 23A of the second inner / outer portion 23, all of which are within a projected range of the through hole 13 of the lid body 10 projected in the axial direction. The contact area 111A of the upper mold 110 and the contact areas 121A and 121B of the lower mold 120 are also located within a projected range of the through hole 13 of the lid body 10 projected in the axial direction. Therefore, the compression reaction force of the first inner / outer portion 22 and the second inner / outer portion 23 generated by the compression between the upper mold 110 and the lower mold 120 can be transmitted to the flat portion 21 without loss. This allows the flat portion 21 of the terminal member 20 to be pressed more strongly against the upper mold 110 in the resin material molding process.

[0047] As described above in detail, the manufacturing method of the battery 1 according to this embodiment includes a resin material molding step of forming the resin material 40 by insert molding while holding the lid body 10 of the exterior body 2 and the terminal member 20 by the upper mold 110 and the lower mold 120. The terminal member 20 used has a flat plate portion 21 located on the outside of the exterior body 2, and a first inner / outer portion 22 and a second inner / outer portion 23 extending from the flat plate portion 21. The flat plate portion 21 is a flat plate-shaped portion extending along the outer surface 11 of the lid body 10. The first inner / outer portion 22 and the second inner / outer portion 23 are portions extending from the flat plate portion 21 through the internal space of the through hole 13 of the lid body 10 to the inside of the exterior body 2. In the resin material molding process, the outer surface 21A of the flat plate portion 21 of the terminal member 20 is brought into contact with the outer main surface molding surface 111 of the upper mold 110, while the inner surface 22A of the first inner / outer portion 22 and the inner surface 23A of the second inner / outer portion 23 are brought into contact with the inner main surface molding surface 121 of the lower mold 120. This allows the terminal member 20 to be held so as to penetrate through the through hole 13 of the lid body 10. Then, in this state, molten resin is injected into the cavity 101 to form the resin material 40. This method can prevent the injected molten resin from entering between the flat plate portion 21 of the terminal member 20 and the upper mold 110 and covering the outer surface 21A of the flat plate portion 21. In other words, the battery 1 can be appropriately charged and discharged using the exposed outer surface 21A of the flat plate portion 21. Therefore, in the battery 1, the outer surface 21A of the flat plate portion 21 can be appropriately made to function as the terminal surfaces 6A and 7A. Therefore, a battery manufacturing method that can stably produce high-quality batteries has been realized.

[0048] The above-mentioned embodiments are merely examples and do not limit the present disclosure in any way. Therefore, the present disclosure can be modified and changed in various ways without departing from the spirit and scope of the present disclosure.

[0049] For example, in the above embodiment, the terminal member 20 has the inner side surface 22A of the first inner side surface 22 and the inner side surface 23A of the second inner side surface 23 provided on the same surface. However, the inner side surface of the first inner side surface 22 and the inner side surface of the second inner side surface 23 of the terminal member may be surfaces located at different positions in the axial direction of the through hole of the lid body. Also, for example, in the above embodiment, the contact surfaces of the lower mold 120 that contact the inner side surface 22A of the first inner side surface 22 and the inner side surface 23A of the second inner side surface 23 of the terminal member 20 are provided in different contact areas 121A, 121B of the inner main surface molding surface 121. However, the contact surfaces of the lower mold that contact the inner side surface 22A of the first inner side surface 22 and the inner side surface 23A of the second inner side surface 23 of the terminal member 20 may be processed as different surfaces.

[0050] Also, for example, in the above embodiment, the battery 1 has the current collecting member 30 that connects the terminal member 20 and the electrode body 3. However, it is also possible to manufacture a battery in which the terminal member is directly connected to the electrode body. That is, the terminal member 20 described in the above embodiment may be provided with a portion corresponding to the electrode body connection portion 32 of the current collecting member 30 and used as the terminal member. In this case, after the resin material molding step, a joining step of connecting the current collecting member to the terminal member is not necessary.

[0051] Furthermore, for example, in the above embodiment, it has been described that the joining step of joining the current collecting member 30 to the uncovered portion 25 of the terminal member 20 after the resin material molding step is performed, and then the current collecting member 30 and the electrode body 3 are connected. However, the joining step of joining the current collecting member 30 to the uncovered portion 25 of the terminal member 20 after the resin material molding step can also be performed after connecting the electrode body 3 to the current collecting member 30.

[0052] Also, for example, the flat plate-shaped first inner / outer portion 22 and second inner / outer portion 23 of the terminal member 20 may be provided with through holes penetrating in the thickness direction. Also, for example, the first inner / outer portion 22 and second inner / outer portion 23 of the terminal member 20 may be provided with notches. The notches may be formed, for example, from the inner surface 22A of the first inner / outer portion 22 and the inner surface 23A of the second inner / outer portion 23 toward the flat plate portion 21. By forming through holes or notches in the flat plate-shaped first inner / outer portion 22 and second inner / outer portion 23 of the terminal member 20, the molten resin injected into the cavity in the resin material molding process tends to be able to easily fill the entire cavity.

[0053] In addition, for example, in the above description, an example has been described in which the technique disclosed herein is applied to both the positive and negative terminal portions 6, 7. However, the technique disclosed herein may be applied to only one of the positive and negative terminal portions 6, 7.

[0054] In the above embodiment, the battery is described as being flat and rectangular in shape. However, the battery shape is not particularly limited to the battery that the above embodiment is applicable to. Furthermore, the battery type (nickel-metal hydride battery, lithium-ion battery, etc.) is not particularly limited to the battery that the above embodiment is applicable to.

[0055] The above disclosed technology also includes the following means 1 and means 2. [Means 1] A method for producing the battery according to claim 1, comprising the steps of: In the resin material molding step, The terminal member is provided with the first inner surface and the second inner surface on the same plane, A battery manufacturing method using the mold in which the inner mold surface that contacts the first inner side surface and the inner mold surface that contacts the second inner side surface are provided in different areas on a single plane.

[0056] [Means 2] A method for producing a battery according to claim 1 or claim 1, comprising the steps of: In the resin material molding step, a non-coated surface that is not coated with the resin material is provided at a portion of the first inner and outer parts of the terminal member that is located inside the exterior body, A battery manufacturing method in which, after the resin material molding process, a joining process is performed to join a collecting member to the uncovered surface, electrically connecting the terminal member to an electrode plate housed inside the outer casing. [Explanation of symbols]

[0057] 1 battery 2 Exterior body 10 Lid 11 Exterior 12. Inside 13 Through hole 20 Terminal material 21 Flat plate part 21A Outer surface (flat plate outer surface) 22 First Interior and Exterior 22A Inner surface (1st inner surface) 23 Second Interior and Exterior 23A Inner surface (2nd inner surface) 25A Uncoated surface 30 Current collecting member 40 Resin material 101 Cavity 110 Upper mold (molding mold) 111 Outer main surface molding surface (outer mold surface) 111A Adhesion area 120 Lower mold (molding mold) 121 Inner main molding surface (inner mold surface) 121A contact area 121B Contact area

Claims

1. A method for manufacturing a battery having an exterior body having a through hole formed therein, a terminal member provided on both the inside and outside of the exterior body by penetrating the through hole, and a resin material bonded to the terminal member and the exterior body, comprising: a resin material molding step of forming the resin material by insert molding while holding the exterior body and the terminal member by a molding die; In the resin material molding step, the terminal member has a flat plate portion located outside the exterior body and extending along the outer surface of the exterior body, and a first inner / outer portion and a second inner / outer portion extending from the flat plate portion through the internal space of the through hole to the inside of the exterior body, the first inner / outer portion and the second inner / outer portion being spaced apart from each other; A method for manufacturing a battery in which the flat outer surface of the flat portion facing outward from the outer casing is tightly attached to the outer mold surface of the mold located on the outside of the outer casing, while the first inner surface facing inward from the first inner or outer surface and the second inner surface facing inward from the outer casing at the second inner or outer surface are brought into contact with the inner mold surface of the mold located on the inside of the outer casing, holding the terminal member so that it passes through the through hole, and in this state, molten resin is injected into the cavity of the mold to form the resin material.

2. A method for producing the battery according to claim 1, comprising the steps of: In the resin material molding step, The terminal member is provided with the first inner surface and the second inner surface on the same plane, A battery manufacturing method using the molding die in which the inner mold surface that contacts the first inner side surface and the inner mold surface that contacts the second inner side surface are provided in different regions on a single plane.

3. A method for producing the battery according to claim 1 or 2, comprising the steps of: In the resin material molding step, a non-coated surface that is not coated with the resin material is provided at a portion of the first inner and outer parts of the terminal member that is located inside the exterior body, A battery manufacturing method in which, after the resin material molding process, a joining process is performed to join a collecting member to the uncovered surface, electrically connecting the terminal member to an electrode plate housed inside the exterior body.

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