JP2004047310A - Sealing plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing plate capable of improving welding precision in a process of welding an external terminal and thus stabilizing the quality by preventing resin intrusion to an end face of an electrode terminal. <P>SOLUTION: The sealing plate is formed to have a sealing plate body 2 made of a polymeric material, with which the electrode terminal 3 is integrated by insert molding. The outer edges of end face portions 3b, 3c of the electrode terminal 3 are made to project outward in the radial direction. Projections 10 are thereby provided to allow the sealing plate body 2 to come into tight contact therewith. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an opening of a pressure vessel (case) for accommodating a storage element such as a battery element and an electrolytic solution in a battery (including a primary battery and a secondary battery) or a capacitor (including an electrolytic capacitor and an electric double layer capacitor). The present invention relates to a sealing plate used for closing a part, and also relates to a sealing plate for an electronic component made of a polymer material.
[0002]
[Prior art]
Conventionally, as shown in FIG. 11, a disc-shaped sealing plate main body 52 made of a polymer material such as a resin (hereinafter, also simply referred to as a resin) is provided, and the sealing plate main body 52 is made of a conductor such as aluminum. A sealing plate 51 in which a pair of electrode terminals 53 are integrated by insert molding is known. On the outer peripheral surface of each electrode terminal 53, an annular flange portion 54 embedded in the thickness of the sealing plate main body 52 and having a retaining function and an interface sealing function is integrally formed. An external terminal 55 such as a nail terminal or a lug terminal is attached to an outer end of the electrode terminal 53, and the external terminal 55 is fixed to the electrode terminal 53 by caulking or, if necessary, by welding. .
[0003]
However, the conventional sealing plate 51 has the following disadvantages.
[0004]
That is, first, in the sealing plate 51, a resin d is generated on the upper and lower end surfaces 53a and 53b of the electrode terminal 53 so as to cover the upper and lower end surfaces 53a and 53b, respectively. The resin circumference d has a dimensional error in the electrode terminals 53 where the height positions of the surfaces 52a and 52b of the sealing plate body 52 and the height positions of the end faces 53a and 53b of the electrode terminals 53 should be originally the same. This is caused by variations in the adhesion of the end faces 53a and 53b of the electrode terminals 53 to the mold. On the other hand, when the external terminal 55 is welded to the outer end of the electrode terminal 53, the lower end surface 53b of the electrode terminal 53 is used as the receiving surface of the electrode terminal 53. Therefore, if resin wrap d occurs on end surfaces 53a and 53b of electrode terminals 53, the resin wrapped in the welding process becomes an insulator, which results in poor welding, which may cause functional inconvenience. . The reason for the occurrence of the resin periphery d is that there is a gap c which is a dimensional error between the end faces 53a and 53b of the electrode terminals 53 and the mold 58 as shown in FIG. Since the corners of the outer peripheral edges of the end faces 53a and 53b of the electrode terminals 53 are rounded or chamfered as shown in FIG. 13, the resin is formed so as to follow this shape when the resin is injected. (The flow of the injected resin is indicated by arrow A).
[0005]
Further, in the sealing plate 51, the interface between the sealing plate main body 52 and the electrode terminals 53 is mainly sealed by the annular flange 54 as described above. If the shape is changed to ()), the adhesion of the sealing plate main body 52 to the flange portion 54 is reduced, and there is a possibility that interface leakage may occur.
[0006]
The sealing plate 51 is fixed by caulking in a state of being seated on a case 56 made of aluminum or the like (a seating portion is indicated by reference numeral 57). The electrode terminal 53 may be bent inward with respect to the case 56 (the bending direction is indicated by an arrow B). In this case, since the outer peripheral edge of the flange 54 of the electrode terminal 53 has an angular shape, Stress concentration occurs at the outer peripheral edge of the flange 54. Therefore, there is a risk that the stress concentration causes initial damage at the time of crimping, or fatigue damage occurs due to vibration during use.
[0007]
[Problems to be solved by the invention]
In view of the above, the present invention can prevent the resin from being generated around the end surface of the electrode terminal, thereby improving the welding accuracy when performing the external terminal welding step and stabilizing the quality. It is an object of the present invention to provide a sealing plate that can be used.
[0008]
In addition, it is another object of the present invention to provide a sealing plate that can improve the adhesion of the sealing plate body to the electrode terminals and thus can improve the sealing property.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a sealing plate of the present invention is a sealing plate obtained by integrating an electrode terminal into a sealing plate body made of a polymer material by insert molding, and has an outer peripheral edge portion of an end surface portion of the electrode terminal. It is characterized in that a projection is provided to make the sealing plate main body adhere by projecting radially outward.
[0010]
In the sealing plate of the present invention having the above configuration, the projection is formed by, for example, providing a projection on a mold at the time of molding the electrode terminal, or by cutting the electrode terminal. However, by providing the above-mentioned protrusion, the electrode terminal end surface and the surface of the sealing plate main body are in contact with each other, so that the resin is hardly generated. Further, by plastically deforming the projections or plastically deforming the electrode terminals to form the projections and then injecting the resin, the electrode terminal end surface and the surface of the sealing plate body are in close contact with each other. Disappears.
[0011]
In addition, since the sealing plate body is in close contact with the projections, it is possible to improve the adhesion of the sealing plate body to the electrode terminals, and when the projections are provided on the upper and lower end surfaces of the electrode terminals, respectively. Since the sealing plate main body is sandwiched between the upper and lower projections to exert a wedge action, the above-mentioned adhesion can be further improved.
[0012]
The present application includes the following technical matters.
[0013]
That is, in order to achieve the above object, one sealing plate proposed by the present application has the following contents.
[0014]
{Circle around (1)} A step is provided between the electrode terminal buried in the resin and the sealing plate body. The step is the end face of the electrode terminal. In addition, the end face of the electrode terminal is formed as a step by, for example, plastic deformation using a mold.
{Circle around (2)} A structure in which a corner portion is provided at a stress concentration portion of the electrode terminal, and a rib is provided on the anti-bending side of the sealing plate main body if necessary.
{Circle around (3)} By making the end face of the electrode terminal a step, the resin is physically prevented from coming off (undercut) between the flange portion and the projection of the electrode terminal.
[0015]
And according to the said structure, it is possible to produce the following effects.
[0016]
{Circle around (1)} By making the end face of the electrode terminal a step, the problem of poor welding can be solved. Further, when the step is plastically deformed by a mold at the time of insert molding, the cost does not increase.
{Circle around (2)} By providing a rounded portion at the outer peripheral edge of the flange portion of the electrode terminal, initial damage and durability can be improved, and a more reliable and safe product can be provided.
{Circle around (3)} When a protrusion is formed by plastically deforming the end surface of the electrode terminal by making the end surface of the electrode terminal a step, the resin is sandwiched between the electrode terminal flange and the electrode terminal. Since the adhesiveness of the resin to the resin is improved, the sealing property can be further improved.
[0017]
The point of this proposal can be understood as follows.
[0018]
(1) A step with the sealing plate body is provided at the end face of the electrode terminal, and the step is plastically deformed, thereby preventing the resin from flowing around the end face of the electrode terminal, thereby improving welding workability and stabilizing. The yield can be improved by ensuring the quality. Further, the step portion plastically deformed has an acute angle, and the resin is surrounded by the acute angle portion, so that the adhesiveness of the resin to the electrode terminals is improved.
[0019]
(2) In addition, by making the stress concentration portion of the flange portion of the electrode terminal into a square radius, damage due to stress concentration generated in the flange portion when the sealing plate is crimped and fixed to the aluminum case, and the capacitor may be vertically It is possible to avoid fatigue destruction that occurs when vibrating right and left. Therefore, the life can be improved.
[0020]
(3) Further, by combining the above two configurations (the acute angle due to plastic deformation, the flange portion of the electrode terminal), the resin portion in close contact with the electrode terminal exerts a wedge effect of physically stopping the resin portion. Further, the sealing performance can be further improved. In addition, the adhesiveness of the resin to the electrode terminals is made uniform by the wedge effect, so that the reliability can be improved without deterioration in sealing performance due to a change with time in actual use (ex. Heat shrinkage).
[0021]
Regarding the amount of crushing of the step on the end face of the electrode terminal, the step is preferably 0.3 to 0.8 mm, more preferably 0.5 mm. If it is less than 0.3 mm, the binding force against deformation of the resin is reduced, that is, the adhesion between the electrode terminal end surface and the surface of the sealing plate body is reduced. If it is more than 0.8 mm, the electrode terminal may be cracked, that is, cracks may occur. is there.
[0022]
Regarding the radius of the corner portion provided in the stress concentration portion of the electrode terminal, the size of the corner radius is preferably R0.1 mm to R0.5 mm, more preferably R0.5 mm (because the radius dimension is large). The lower the stress). However, if there is a space restriction, it is preferable that R is around 0.15 mm.
[0023]
(4) Adhesion between the end surface of the electrode terminal and the surface of the sealing plate main body prevents the resin from flowing around between the end surface of the electrode terminal and the surface of the sealing plate main body. As a method for bringing the electrode terminal end face into close contact with the surface of the sealing plate body, a projection is provided on the end face of the electrode terminal to make it difficult for resin to flow into the gap between the electrode terminal end face and the mold.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0025]
FIG. 1 shows a cross section of a sealing plate 1 according to an embodiment of the present invention, and an enlarged view of a main part thereof is shown in FIG.
[0026]
The sealing plate 1 according to the embodiment is configured as follows.
[0027]
That is, first, a sealing plate main body 2 formed in a plate shape with a heat-resistant resin such as a phenol resin or a PPS resin as a polymer material is provided, and the sealing plate main body 2 is provided with a pair of conductive members such as aluminum. The electrode terminal 3 is embedded so as to penetrate in the thickness direction, and an external terminal 4 such as a nail terminal or lug terminal made of a steel plate such as SPCC is attached to an outer end of the electrode terminal 3.
[0028]
The sealing plate body 2 is formed in a plate shape from a heat-resistant resin such as a phenol resin or a PPS resin as described above. For example, the sealing plate body 2 is formed in a disk shape and is caulked to an opening of a case 5 such as a capacitor. It is sealed.
[0029]
Each of the pair of electrode terminals 3 is integrated with the sealing plate body 2 by insert molding. Each of the electrode terminals 3 is formed integrally with an annular flange 6 on an outer peripheral surface 3a having a cylindrical shape, and the outer peripheral edge of the upper surface 6a has a corner as the stress concentration portion described above. A round part 7 is provided. The corner radius portion 7 is formed in a protruding shape projecting upward, and its cross-sectional shape is formed in a semicircular or substantially semicircular shape having a rounded shape or an arc shape or a substantially arc shape. An annular groove 8 is provided on the lower surface 6b of the flange portion 6, and an annular convex portion 9 which forms a pair of upper and lower convex portions with the angular round portion 7 is provided on an outer peripheral side thereof. The entire flange 6 is embedded in the thickness of the sealing plate body 2.
[0030]
The upper and lower end surfaces 3b and 3c of the electrode terminal 3 are exposed on the surface of the sealing plate body 2, respectively, and the upper and lower end surfaces 3b and 3c have small-diameter projecting connection portions for connecting external terminals or internal terminals, respectively. 3d, 3e are provided, and furthermore, projections 10 are formed integrally with the outer peripheral edges of the upper and lower end surfaces 3b, 3c, respectively, and project outward in the radial direction and are in close contact with the resin of the sealing plate body 2. I have. As shown in FIG. 3, each of the protrusions 10 is provided with a step 11 having a height h higher than the surfaces 2a, 2b of the sealing plate body 2 at the outer peripheral edges of the end faces 3b, 3c of the electrode terminal 3. The portion 11 is formed in an annular shape by plastic deformation, and is pressed downward or upward by a mold clamping force of a mold (not shown) for molding the sealing plate body 2, resulting in plastic deformation. (The pressing direction is indicated by an arrow B), and is formed as a triangular or substantially triangular cross-section that projects radially outward and has a sharpened tip (outer peripheral edge). The resin of the sealing plate body 2 is in close contact.
[0031]
The manufacturing procedure of the sealing plate 1 is as follows.
[0032]
That is, first, when forming the electrode terminal 3 prior to forming the sealing plate main body 2, the step portions 11 are respectively formed on the upper and lower end surfaces 3 b and 3 c of the electrode terminal 3 as shown in FIG. 3.
[0033]
Next, at the time of molding the sealing plate body 2, the electrode terminal 3 is inserted into the cavity space of the mold for molding the sealing plate body 2, and the mold clamping force when clamping the mold is shown in FIG. 4. The protrusions 10 are formed by plastically deforming the step portions 11 as described above, and insert molding is continuously performed as shown in FIG. 5, that is, the resin is injected into the cavity space of the mold to form the sealing plate body 2. Mold. The resin of the sealing plate body 2 comes into close contact with the electrode terminal 3 due to the molding pressure, and particularly penetrates between the upper projection 10 and the flange 6 and between the flange 6 and the lower projection 10 like a wedge. In order to push these gaps apart, the repulsive force increases the adhesion.
[0034]
Next, as shown in FIG. 6, the external terminal 4 is joined to the terminal mounting portion 3d of the electrode terminal 3 by caulking means. Further, since the fixing strength between the electrode terminal 3 and the external terminal 4 may be insufficient only by crimping, the two terminals 3 and 4 are welded as needed to increase the fixing strength.
[0035]
As a result of the step portion 11 being plastically deformed, a flat pressed surface 12 is formed on the upper and lower end face portions 3b, 3c so as to be flush with the surfaces 2a, 2b of the sealing plate main body 2, respectively. A cylindrical rising surface 13 is formed on the inner peripheral side of the pressed surface 12, and the rising surface 13 is tapered (conical) as shown in FIG. 7 due to the plastic deformation. (Planar).
[0036]
In the sealing plate 1 having the above configuration, the outer peripheral edges of the upper and lower end surfaces 3b and 3c of the electrode terminals 3 are plastically deformed by the mold clamping force of the mold as described above so as to protrude radially outward. Since the projections 10 are provided, it is possible to prevent a gap between the projections 10 and the mold from being formed around the resin. Therefore, the resin does not wrap around the end surfaces 3b and 3c of the electrode terminals 3, and the welding accuracy of the welding process of the external terminals 4 can be improved, so that the quality of the sealing plate 1 can be stabilized.
[0037]
In addition, the resin of the sealing plate main body 2 is in close contact with the protrusion 10, and the resin is particularly like a wedge between the upper protrusion 10 and the flange 6 and between the flange 6 and the lower protrusion 10. In order to penetrate and expand these spaces, the repulsive force increases the adhesion. Therefore, the resin is hardly peeled off from the electrode terminals 3, and thus the interface sealing property between them can be improved.
[0038]
In addition, since the corner portion 7 having the above-described shape is provided on the outer peripheral edge of the upper surface 6a of the flange portion 6 of the electrode terminal 3 where stress concentration is likely to occur on the sealing plate body 2, the sealing plate body 2 The occurrence of stress concentration can be suppressed, and the occurrence of initial damage and fatigue damage due to use can be suppressed.
[0039]
In order to further increase the strength of the sealing plate body 2, if necessary, as shown in FIG. 8A or 8B, the surface (upper surface portion 2a) of the sealing plate body 2 on the anti-deflection side is used for reinforcing the strength. Ribs 14 may be provided.
[0040]
The method of forming the protrusions 10 may be, for example, providing a protrusion in the mold at the time of forming the electrode terminals 3 or cutting the electrode terminals 3 in addition to the plastic deformation by the mold. . In these cases, as shown in FIG. 9, even if there is a dimensional error c in the electrode terminal 3, by providing the protrusion 10 on the end surface of the electrode terminal 3, the injected resin hits the protrusion 10 (the injected resin). The flow of the resin is indicated by an arrow A), and the tip of the protrusion 10 is lifted by the force, whereby the gap c between the outer peripheral edge of the end surface of the electrode terminal 3 and the mold 15 can be closed. It can be hardly generated. Further, as shown in FIG. 10, since the protrusions 10 protrude from the outer peripheral surface 3 a of the electrode terminal 3 toward the flange portion 6, the flow of the injected resin causes an angular shape ( (R and chamfer), it is possible to prevent the resin from being generated. The dotted lines in FIGS. 9 and 10 correspond to FIGS. 12 and 13 of the conventional shape.
[0041]
【The invention's effect】
The present invention has the following effects.
[0042]
That is, in the sealing plate of the present invention having the above-described configuration, by providing a projection that makes the outer peripheral edge portion of the end face portion of the electrode terminal protrude radially outward to closely contact the sealing plate main body, the electrode Since the terminal end surface is in contact with the surface of the sealing plate main body, or the electrode terminal end surface is in close contact with the surface of the sealing plate main body, it is possible to suppress generation of resin. Therefore, no resin is formed around the end face of the electrode terminal, and the welding accuracy can be improved when performing the external terminal welding step, so that the quality of the sealing plate can be stabilized.
[0043]
In addition, since the sealing plate body is in close contact with the projections, the adhesion of the sealing plate body to the electrode terminals can be improved, and the projections are provided on the outer peripheral edges of the upper and lower end surfaces of the electrode terminals. In this case, since the sealing plate body is sandwiched between the upper and lower protrusions to exert a wedge action, the above-mentioned adhesion can be further improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a sealing plate according to an embodiment of the present invention. FIG. 2 is an enlarged view of a main part of FIG. 1. FIG. 3 is a cross-sectional view showing a manufacturing process of the sealing plate. FIG. 5 is a cross-sectional view showing a manufacturing process of the sealing plate. FIG. 6 is a cross-sectional view showing a manufacturing process of the sealing plate. FIG. 7 is a cross-sectional view showing a main part of a sealing plate according to another embodiment of the present invention. 8A and 8B are plan views of a sealing plate according to another embodiment of the present invention. FIGS. 9A and 9B are both plan views of another embodiment of the present invention. FIG. 10 is a sectional view showing a manufacturing process of a sealing plate. FIG. 10 is a sectional view showing a manufacturing process of a sealing plate according to another embodiment of the present invention. FIG. 11 is a sectional view of a sealing plate according to a conventional example. FIG. 13 is a cross-sectional view showing a manufacturing process of a sealing plate according to the related art. FIG. 13 is a cross-sectional view showing a manufacturing process of a sealing plate according to a conventional example.
DESCRIPTION OF SYMBOLS 1 Sealing plate 2 Sealing plate main body 2a, 2b Surface 3 Electrode terminal 3a Outer peripheral surface 3b, 3c End surface 3d, 3e Terminal connection part 4 External terminal 5 Case 6 Flange 6a Upper surface 6b Lower surface 7 Corner radius 8 Groove 9 Convex portion 10 Projection 11 Step 12 Pressed surface 13 Rising surface 14 Rib 15 Mold

Claims (1)

A sealing plate (1) obtained by integrating an electrode terminal (3) with a sealing plate body (2) made of a polymer material by insert molding,
A projection (10) for bringing the sealing plate body (2) into close contact with each other by projecting the outer peripheral edges of the end surfaces (3b) and (3c) of the electrode terminal (3) outward in the radial direction. Characteristic sealing plate.

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