JP4344899B2 - Sealing method of electronic parts - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for sealing an electronic component such as a battery or a capacitor in which a lid and a gasket are inserted into an opening of a bottomed case and fixed by caulking.
[0002]
[Prior art]
Sealing of a sealing portion of an electronic component such as a battery or a capacitor is generally performed by a caulking method using a gasket. The material of the gasket is a hydrocarbon polymer material. Polypropylene is used for the resin, and butyl rubber, ethylene propylene rubber, hydrogenated styrene-butadiene rubber, hydrogenated styrene-isoprene rubber, etc. are used for the rubber. Elastomers are mainly used.
[0003]
Of these, first, in order to ensure the sealing performance of the resin gasket, it is necessary to crimp the resin gasket so strongly that the crimping force remains during crimping. However, if the crimping is too strong, there is a risk that the gasket will be extremely thin and the gasket may be damaged.
[0004]
On the other hand, in rubber gaskets, it is possible to ensure sealing performance without the need to manage the degree of caulking so closely, but due to the large deformation caused by caulking, if the caulking is too strong, An extremely thin part may be formed and the gasket may be damaged, resulting in a decrease in sealing performance. Also, the dimensions are not stable. Therefore, in order to prevent this, it is still necessary to manage the degree of crimping.
[0005]
[Problems to be solved by the invention]
In view of the above, it is an object of the present invention to provide an electronic component sealing method capable of relatively easily managing the degree of caulking and thus improving the reliability of the seal.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the electronic component sealing method according to claim 1 of the present invention is the electronic component sealing method in which a lid and a gasket are inserted into the opening of the bottomed case and fixed by caulking. The caulking process is performed by inserting a high-rigidity over-caulking prevention part sandwiched between the inner bottom surface and the caulking portion of the material together with the lid and the gasket to limit the caulking amount to a certain amount. is there.
[0007]
The electronic component sealing method according to claim 2 of the present invention is the electronic component sealing method according to claim 1, wherein the over-caulking prevention component is inserted into the opening of the case together with the lid and the gasket. A gap is set between the over-caulking prevention part and the inner bottom surface of the case to limit the stroke amount during caulking of the over-caulking prevention part, and the gap size a and the initial thickness of the support surface side gasket are set. With respect to the dimensional relationship with H ₁ and the dimensional relationship between the gap size a and the initial thickness H ₂ of the pressing surface side gasket, a / H ₁ and a / H ₂ are 0.1 to 0.6, respectively. It is characterized by setting as follows.
[0008]
As in the electronic component sealing method according to claim 1 of the present invention having the above-described configuration, prior to caulking the peripheral portion of the case, the amount of caulking is sandwiched between the inner bottom surface of the case and the caulking portion. When the caulking process is performed after inserting the rigid and over-caulking parts that are limited to a certain amount together with the lid and gasket, the over-caulking parts perform a kind of spacer function, Can be restricted as previously set. The specific content of the restriction is that, as described in claim 2, when the over-caulking prevention part is inserted into the opening of the case together with the lid and the gasket, the over-caulking prevention part and the inner bottom surface of the case are interposed. , a gap set to limit the stroke amount at the time of caulking parts for excessive caulking prevention magnitude a and the pressing dimensional relationship and the gap between the initial thickness H ₁ of size a and bearing surface side gasket of the gap the dimensional relationship between the initial thickness _{H 2} of the side gasket, it is preferable to set such a / _{H 1} and a / _{H 2} respectively become 0.1 to 0.6.
[0009]
In other words, the sealing method of the electronic component of the present invention, in other words, inserts the element part of the electronic component from the open end of the bottomed case, covers the lid through the gasket, and crimps the open end of the bottomed case by caulking. It is a sealing method that seals, inserts the gasket into the lid, inserts it from the open end of the bottomed case, installs it on the surface that supports the bottom of the gasket, so that there is a gap on the support surface of the gasket that limits the stroke range of crimping A high-rigidity over-caulking prevention part with various dimensions is inserted between the case and the gasket.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 shows a cross section of the main part of an electronic component 1 manufactured or manufactured by an electronic component sealing method according to the embodiment. FIG. 1 (A) shows a state before crimping, FIG. ) Shows the state after crimping. The electronic component 1 is a battery such as a button battery or a capacitor as described above, and is configured as follows.
[0012]
That is, as shown in FIG. 2B, first, a bottomed case 2 having one opening is provided, and an element portion (not shown) of the electronic component 1 is inserted into the case 2. The opening of the case 2 is closed by the lid 3. The case 2 is a so-called positive electrode can, and the lid 3 is a so-called negative electrode can or sealing plate. The lid 3 is fixed to the case 2 by bending the peripheral edge 2b of the case 2 inwardly by caulking. The caulking edge 2b of the case 2 and the peripheral edge 3b of the lid 3 are fixed. A resin or rubber gasket 4 is mounted between them, and a high-rigid material over-caulking prevention component 5 is mounted between the peripheral edge 2 b of the case 2 and the gasket 4.
[0013]
As shown in FIG. 2A, in the state before crimping, the case 2 is vertically raised from a disk-shaped flat surface portion (also referred to as a bottom surface portion) 2a and the periphery of the disk-shaped flat surface portion 2a. And a cylindrical peripheral edge portion (also referred to as a side surface portion) 2b, and as shown in FIG. 5B, when a caulking load is applied from above, the tip end portion (caulking portion) of the peripheral edge portion 2b 2c is bent inward over the entire circumference, the over-caulking prevention component 5 is slid, the gasket 4 is compressed, and the lid 3 is pressed and fixed.
[0014]
The lid 3 includes a disk-shaped flat surface portion (also referred to as an upper surface portion, not shown), an annular inclined surface portion 3a integrally formed on the periphery of the disk-shaped flat surface portion, and a peripheral edge of the inclined surface portion 3a. Are integrally formed with an annular peripheral portion (also referred to as a crimped portion) 3b having a U-shaped cross section, and is fixed to the case 2 by a peripheral portion 3b having a substantially U-shaped cross section.
[0015]
The gasket 4 includes an annular portion (also referred to as a gasket support portion or a support surface side gasket) 4a sandwiched between the peripheral portion 3b of the lid 3 and the flat portion 2a of the case 2, and the lid 3 Between the peripheral edge portion 3b of the lid 3 and the caulking portion 2c of the case 2 between the peripheral edge portion 3b and the peripheral edge portion 2b of the case 2 and the annular portion 4b sandwiched between the peripheral edge portion 3b and the peripheral edge portion 2b of the case 2 In addition, an annular portion (also referred to as a pressing surface side gasket) 4c that is sandwiched up and down together with the over-caulking prevention component 5 is integrally formed and formed into a U-shaped cross section.
[0016]
Further, the over-caulking prevention component 5 includes a cylindrical portion 5a sandwiched between the gasket 4 and the peripheral edge 2b of the case 2, and a gasket 4 after crimping as shown in FIG. And an annular portion 5b sandwiched vertically between the crimping portion 2c of the case 2 and an annular body having an L-shaped cross section. The lower end portion of the cylindrical portion 5a is formed in a cross-sectional arc shape according to the round (roundness) of the boundary between the flat surface portion 2a and the peripheral edge portion 2b in the case 2.
[0017]
The over-caulking prevention part 5 is formed of a highly rigid material such as a metal material or a fiber-reinforced polymer material. The metal material is preferably the same material as the material that is resistant to the electrolyte or the high dielectric constant liquid, the material used as the electrode, or the metal material of the case 2, and the polymer material is a phenol resin. Alternatively, engineering plastics such as polyphenylene sulfide, polyamideimide, polyetheretherketone, polyimide, syndiotactic polystyrene, fluororesin, aromatic polyamide, thermotropic liquid crystal polymer resin, and polyetherimide are preferable.
[0018]
Further, as shown in FIG. 5A, when this over-caulking prevention part 5 is inserted into the opening of the case 2 together with the lid 3 and the gasket 4 in the state before caulking, A gap 6 is set between the part 5 and the flat portion 2a (inner bottom face) of the case 2 to limit the stroke amount when the over-caulking prevention part 5 is caulked. The size a of the gap 6 and the gasket dimensional relationship between the initial thickness H ₁ 4 before crimping bearing surface side gasket 4a of,
a / H ₁ = 0.1 to 0.6 (1) is satisfied, and the size a of the gap 6 and the initial thickness H ₂ of the holding surface side gasket 4c of the gasket 4 before caulking The dimensional relationship of
It is set so as to satisfy the _{a / H 2 = 0.1~0.6 ··· (} 2) expression.
[0019]
When manufacturing the electronic component 1 having the above-described configuration, first, the element portion of the electronic component 1 is inserted from the opening of the case 2 into the interior as shown in FIG. The two parts are inserted into the case 2 from the opening, and simultaneously or subsequently, the over-caulking prevention part 5 is inserted into the case 2 from the opening, and then the caulking load is applied from above to apply the case 2 The peripheral edge 2b is bent and each part is caulked and fixed as shown in FIG. This caulking is stopped uniformly when the over-caulking prevention part 5 is pushed by the caulking part 2c of the case 2 and slides downward and reaches the flat part 2a of the case 2, and according to this method, It is possible to limit the amount of caulking to a certain amount. Therefore, it is possible to prevent the gasket 4 from being damaged due to excessive crimping, and to improve the reliability of the seal.
[0020]
The above formulas (1) and (2) are obtained from the results of the following tests.
[0021]
That is, as shown in FIGS. 1A and 1B, the overall height of the gasket 4 is H, the height (initial thickness) of the support surface side gasket 4a is H ₁ , and the support surface side gasket after crimping. The height (thickness) of 4a is H ₁ ', the height (initial thickness) of the pressing surface side gasket 4c is H ₂ , and the height (thickness) of the pressing surface side gasket 4c after crimping is H ₂ ', the size of the gap 6 is a, the material of the rubber cross-linked product of the gasket 4 and (JIS hardness 75), the compression rate of an _{H 1} from _{(H 1 -H 1 ') /} H 1 ··· (3) formula determined, the compression rate between _{H 2 (H 2 -H 2 '} ) / H 2 ··· (4) determined from equation quality determination of sealability by setting the dimensions as shown in Table of FIG 2 (Decision of occurrence of cracking in gasket) (Sealability: Good, ○: Acceptable: Δ, Impossible (NG): x), H ₁ / H ₂ = In the case of 0.75 to 1.5, sealability was acceptable when a / H ₁ = 0.13, and cracking occurred when a / H ₁ = 0.8. Therefore, the test results are as shown in the above formulas (1) and (2), whereby the collapse amount of the gasket 4 can be kept at an appropriate amount. In addition, in order to keep all the test results of sealing performance within the good range,
a / H ₁ = 0.3 to 0.6 (5) Formula a / H ₂ = 0.3 to 0.6 (6) is more preferable.
[0022]
【The invention's effect】
The present invention has the following effects.
[0023]
That is, according to the electronic component sealing method according to claim 1 or 2 of the present invention having the above-described configuration, it is possible to limit the caulking amount as set in advance by the spacer function exhibited by the over-caulking prevention component. Become. Therefore, according to this method, it is possible to prevent the gasket from being excessively caulked and being damaged, thereby improving the reliability of the seal.
[Brief description of the drawings]
1A and 1B are process explanatory views of a method for sealing an electronic component according to an embodiment of the present invention, where FIG. 1A is an explanatory view showing a state before caulking, and FIG. 1B is an explanatory view showing a state after caulking; Fig. 2 Table showing the crushing rate and sealing results after crimping
DESCRIPTION OF SYMBOLS 1 Electronic component 2 Case 2a Flat surface part 2b, 3b Peripheral part 2c Crimp part 3 Lid 3a Slope part 4 Gasket 4a Support surface side gasket 4b, 5b Annular part 4c Holding surface side gasket 5 Over-caulking prevention part 5a Cylindrical part 6 gap

Claims (2)

In the sealing method of the electronic component (1) in which the lid (3) and the gasket (4) are inserted into the opening of the bottomed case (2) and fixed by caulking,
A highly rigid over-caulking prevention part (5) which is sandwiched between the inner bottom surface of the case (2) and the caulking part (2c) and restricts the caulking amount to a certain amount is attached to the lid (3) and the gasket ( 4) A method for sealing an electronic component, which is performed together with a caulking process. In the electronic component sealing method according to claim 1,
When the over-caulking prevention part (5) is inserted into the opening of the case (2) together with the lid (3) and the gasket (4), the over-caulking prevention part (5) and the inner bottom surface of the case (2) In the meantime, a gap (6) for limiting the stroke amount during caulking of the over-caulking prevention part (5) is set,
The initial thickness H of the gap size a and the pressing surface gasket (4c) of the dimensional relationship and the gap between the initial thickness H ₁ of the (6) the size of a and bearing surface gasket (4a) (6) ₂ is set such that a / H ₁ and a / H ₂ are 0.1 to 0.6, respectively.

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