JP2001160382A - Sealed body of battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed body of a battery which can be fixed, without displacements of a thin-film plate that occludes a through-hole for gas purging formed at the bottom plate, and that bursts when a pressure equal to or higher than the given value is applied, even if the thin film plate is made smaller in size. SOLUTION: On the surface of a bottom plate 11 where a conductive plate 14 of PTC element is placed, a concave steps 11d are provided, so that a thin film plate 13 made of a metal laminate resin is fitted and inserted without displacements. Concave steps 11d are provided with a slightly smaller depth than the thickness of a thin film plate 13, thus the upper surface of the thin-film plate 13 fitted and inserted in the concave steps 11d protrudes slightly through the upper surface of a rim portion 11e. For the thin-film plate 13 made of metal laminate resin, the upper surface of the thin-film plate 13 is pressed by the conductive plate 14, thereby the upper surface of the thin-film plate 13 and the upper surface of the rim portion 11e of the bottom plate 11 are be flush with each other, and therefore the conductive plate 14 is connected with the upper surface of the rim portion 11e of the bottom plate 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery sealing body for sealing an opening of a bottomed cylindrical case.

[0002]

2. Description of the Related Art In a sealed battery, a power generating element is housed in a cylindrical case having a bottom, an electrolytic solution is injected, and an opening of the case is sealed by a disk-shaped sealing body through an external gasket. Have been. The sealing body has a bottom plate 1, a terminal cap 2, a thin plate 3, and a conductive plate 4, as shown in FIG. The bottom plate 1 has conductivity, a through hole 1a for venting gas is formed in the center by notch or punching, and a bent portion 1b is provided on the outer periphery. Strictly speaking, the through hole 1a is formed in the bulging portion 1c in which the bottom plate 1 protrudes in a direction opposite to the bent portion 1b. Is configured.

[0003] The terminal cap 2 has conductivity, and has a flange portion 2b provided at an opening edge of a bottomed cylindrical portion 2a having an inner diameter larger than the inner diameter of the through hole 1a. Thin plate 3
Is a thin film member such as a metal laminate resin or a metal foil (Pracha disk) that closes the through hole 1a of the bottom plate 1, and when the pressure inside the case (not shown) becomes a predetermined value or more, The valve is ruptured, and the electrolyte in the case is prevented from leaking. The metal laminate resin has a two-layer structure of a metal material layer such as an aluminum foil and a resin layer, and does not have conductivity due to the resin layer. The conductive plate 4 has a P
It is a thin plate having conductivity, such as a TC element, a metal plate or a conductive resin plate similar thereto, and has a gas vent through hole 4a larger than the through hole 1a.

[0004] Then, as shown in FIG.
By fixing the thin plate 3 on the bottom plate 1, the through hole 1a
Are sealed. If the thin plate 3 is a metal laminate resin, it is fixed to the bottom plate 1 by heat welding, and if the thin plate 3 is a metal foil, it is fixed to the bottom plate 1 by welding. The conductive plate 4 is overlaid on the thin plate 3. However, the through hole 1a of the bottom plate 1 and the through hole 4
a is continuous. The outer peripheral edge 4b of the conductive plate 4 is in contact with the bent portion 1b of the sealing body. Then, the conductive plate 4 is pressed by the flange portion 2b of the terminal cap 2, and the bottom plate 1
The gasket 5 is interposed between the periphery of the terminal cap 2 and the periphery of the terminal cap 2, and the bent portion 1b of the bottom plate 1 is caulked, whereby the flange portion 2b of the terminal cap 2 is fixed. Then, as shown in FIG. 6, a battery sealing body in which the bottom plate 1, the terminal cap 2, the thin plate 3, the conductive plate 4, and the gasket 5 are integrated is completed.

When the thin plate 3 is made of a metal laminate resin,
Since the resin layer is thermally welded to the bottom plate 1, the bottom plate 1 and the terminal cap 2 are insulated by the resin layer. The bottom plate 1 and the terminal cap 2 are electrically connected by joining the outer peripheral edge 4b of the conductive plate 4 to the bent portion 1b of the bottom plate 1 and joining the front side of the conductive plate 4 to the terminal cap 2.

[0006]

In order to fix the thin plate 3 to the bottom plate 1 without displacement, the thin plate 3 can be made almost the same size as the bottom plate 1 as shown in FIG. In order to produce a large amount of sheet 3 from the obtained material,
As shown in FIG. 8, the size of the thin plate 3 must be reduced.

However, if the size of the thin plate 3 is small,
May be misaligned. In particular, when the small-sized thin plate 3 is made of a metal-laminated resin, the thin plate 3 softened by heat tends to be misaligned when it is thermally welded by a jig and the direction of holding the jig is directional.

Since the bottom plate 1 is formed with the through hole 1a, a portion of the thin plate 3 which is displaced is joined to the bottom plate 1 with a small area. Since the bonding strength of the thin plate 3 and the bottom plate 1 joined at the small portion is weak, the thin plate 3 is easily peeled from the bottom plate 1. When the thin plate 3 is peeled off from the bottom plate 1, the electrolyte in the case leaks out, and the valve is in the same state as when the valve is operated, even though the valve should not be operated. This phenomenon becomes remarkable when the peripheral portion 3a of the thin plate 3 is not pressed by the conductive plate 4.

Also, if the size of the thin plate 3 is small,
9, a gap g is formed between the conductive plate 4 and the bottom plate 1, as shown in FIG. Then, when the bent portion 1b of the bottom plate 1 is swaged with a large force, the conductive plate 4 is deformed. Thin plate 3
Is made of a metal laminated resin, the conductive plate 4 is deformed, so that the outer peripheral edge 4b of the conductive plate 4 and the bent portion 1 of the bottom plate 1 are formed.
b and are not electrically connected to each other, so that the bottom plate 1
And the terminal cap 2 are not electrically connected. Further, whether the conductive plate 4 is made of a metal laminate resin or a metal foil, the bent portion 1b of the bottom plate 1 has a gap g.
If the force for caulking is strong, the bent portion 1b of the bottom plate 1 may be deformed. Conversely, if the force for caulking the bent portion 1b of the bottom plate 1 is weak, the bottom plate 1, the thin plate 3, the conductive plate 4, and the terminal cap 2 will not be securely fixed.

In view of the above, the present invention ensures that even if a thin thin plate placed on a bottom plate having a through hole formed therein is reduced in size, the thin plate is not displaced, so that the bottom plate and the terminal cap can be securely electrically connected. It is an object of the present invention to provide a battery sealing body in which a battery can be electrically connected and a gap between a bottom plate and a conductive plate is not formed or is almost not formed.

[0011]

According to a first aspect of the present invention, there is provided:
In a battery sealing body having a bottom plate having a through-hole for venting gas and a thin plate that closes the through-hole and bursts when a pressure equal to or more than a predetermined value is applied, one surface of the bottom plate is provided. In addition, there is provided a concave step for fitting the thin plate so as not to be displaced.

According to the first aspect, the recessed step is provided around the through hole, and the thin plate closing the through hole is fitted into the recessed step so as not to be displaced. Even if it is small, it does not move on the bottom plate. Therefore, for example, even if the thin plate is a small-sized metal laminate resin and the direction of holding the jig for heat welding is directional, the thin plate fitted into the recessed step does not shift, and the thin plate is heat-sealed. It is fixed within the recessed step with an area necessary for the formation. Although the concave step is originally provided on the surface on which the conductive plate is disposed, it may be provided on the surface on which the conductive plate is not disposed.

According to a second aspect of the present invention, there is provided a bottom plate having a through hole for venting, a thin conductive plate having a through hole for venting, and a through hole formed in the bottom plate. And a thin film-shaped thin plate that ruptures when a pressure equal to or more than a predetermined value is applied, and the thin plate is sandwiched between the bottom plate and the conductive plate, and the bottom plate and the conductive plate are connected so that the respective through holes communicate with each other. In the battery sealing body having a structure in which the plate is aligned with the bottom plate, the concave step into which the thin plate is fitted so as not to be displaced on the surface of the bottom plate on which the conductive plate is disposed has a thickness slightly smaller than the thin plate. It is characterized by being provided at a depth of minutes.

According to the second aspect, as in the first aspect, the thin plate is fitted into the recessed step so as not to be displaced even if the size is small. Further, in the second aspect, the depth of the recess step is slightly smaller than that of the thin plate, so that the thin plate fitted in the recess step has a surface of the bottom plate on the side where the conductive plate is arranged ( Below, "top"
That. ) Projecting slightly. When the thin plate is a metal laminated resin, it has elasticity, so that when the thin plate is pressed by the conductive plate from above, the thin plate is compressed and the upper surface of the thin plate and the upper surface of the bottom plate become the same surface, and the conductive plate is provided with a concave step. It is also joined to the upper surface of the peripheral portion of the bottom plate that is not provided, and the conductive plate and the bottom plate are electrically connected by the surface.

Even when the thin plate is a metal foil, the upper surface of the thin plate slightly protrudes from the upper surface of the bottom plate, but the thin plate does not compress when pressed by the conductive plate. However, the thin metal foil electrically connects the bottom plate and the conductive plate. Also,
Since most of the thin metal foil plates are fitted in the recessed steps, the amount of the thin plate projecting from the bottom surface is small, and there is almost no gap between the bottom plate and the conductive plate on the thin plate. Furthermore, since the thin plate fitted in the recessed step slightly projects from the peripheral edge of the bottom plate, no gap is generated between the thin plate and the conductive plate, and no gas escape occurs. It can be prevented from lowering.

According to a third aspect of the present invention, there is provided a bottom plate having a through hole for degassing, a thin conductive plate having a through hole for degassing, and a through hole formed in the bottom plate. And a thin film-shaped thin plate that bursts when a pressure equal to or more than a predetermined value is applied, and a terminal cap provided with a flange portion at an opening edge of the bottomed cylindrical portion, wherein the thin plate is formed of the bottom plate and the bottom plate. The bottom plate and the conductive plate are positioned so as to be sandwiched between the conductive plate and the respective through holes communicate with each other, and the bottomed cylindrical portion of the terminal cap is positioned around the through hole of the conductive plate, and the terminal cap is provided. In the battery sealing body having a structure in which the flange portion is overlaid on the conductive plate, the recessed step in which the thin plate is fitted to the surface of the bottom plate on the side where the conductive plate is arranged so as not to displace is slightly smaller than the thin plate. Is provided at a depth corresponding to the thin thickness in the recess step. Periphery of the fitting encased thin plate is,
The terminal cap is sandwiched between the flange portion of the terminal cap and the bottom plate via a conductive plate.

According to the third aspect, the peripheral edge of the thin plate fitted into the recessed step is sandwiched between the flange portion of the terminal cap and the bottom plate via the conductive plate, so that the thin plate is connected to the terminal cap. It will be pressed by the flange,
It is possible to prevent the valve from being easily peeled off from the concave step and to reduce the valve operating pressure.

According to a fourth aspect of the present invention, in the third aspect, the conductive plate is sized to project a peripheral edge of a flange portion of the terminal cap to be joined, and the peripheral edge of the projected flange portion is provided. The part is characterized in that a gasket having a U-shaped cross section is fitted.

According to the fourth aspect, since the conductive plate is electrically connected to the upper surface of the bottom plate or the thin plate made of metal foil,
There is no need to join the outer peripheral edge of the conductive plate to the bent portion of the bottom plate, and the conductive plate can be sized to protrude the peripheral edge of the flange portion of the terminal cap. The protruding flange portion of the terminal cap is sandwiched between gaskets having a U-shaped cross section, so that the degree of sealing between the flange portion of the terminal cap and the bent portion of the bottom plate can be increased.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A battery sealing body of the present invention will be described with reference to FIGS. Here, in order to facilitate understanding, each component will be described as having a disc shape or a cylindrical shape.

As shown in FIG. 1, the sealing body of the battery of the present invention has a surface (hereinafter, referred to as a surface) on the side of the bottom plate 11 on which the bent portion 11b is formed.
It is called "upper surface". ) Is provided with a concave step 11d for fitting the thin plate 13 which bursts when a pressure equal to or more than a predetermined value is applied so as not to be displaced. As shown in FIG. 2, the thin plate 13 has a small size in which the peripheral portion 13 a is sandwiched between the bottom plate 11 and the flange portion 12 b provided at the opening edge of the bottomed cylindrical portion 12 a of the terminal cap 12.

The thin plate 13 closes the gas vent through hole 11a formed in the bottom plate 11, and the concave step 11d is provided around the through hole 11a. As described in the prior art, the through-hole 11a is formed in the swelling portion 11c protruding from the bottom plate 11.
Includes recessed parts. The outer diameter of the recessed step 11d is
The thin plate 13 is formed to be slightly larger than the outer diameter of the thin plate 13 so as not to be displaced in the recessed step 11d. The depth of the recessed step 11d is such that the thin plate 13 is
d, the upper surface of the thin plate 13 is
Is slightly thinner than the thin plate 13 so as to slightly protrude from the upper surface.

When the thin plate 13 is fitted into the recess 11d of the bottom plate 11, the thin plate 13 cannot move on the bottom plate 11. Therefore, when the thin plate 13 is made of a metal laminated resin, the thin plate 13 is thermally welded by a jig. However, even if the jig is held in a directional manner, the thin plate 13 does not shift on the upper surface of the bottom plate 11. . When the thin plate 13 made of a metal laminate is fitted into the recessed step 11 d and thermally welded, the through hole 11 a is sealed by the thin plate 13. The thin plate 13 is fixed in the recessed step 11d with an area required for heat welding.

Further, since the thin plate 13 is fitted into the recessed step 11d, the peripheral edge 11e of the bottom plate 11 is exposed without the thin plate 13 being joined. And
The conductive plate 14 is mounted on the thin plate 13 fitted into the exposed peripheral edge 11e of the bottom plate 11 and the recessed step 11d. The through hole 14a formed in the conductive plate 14 and the through hole 11a formed in the bottom plate 11 are continuous so that the thin plate 13 can operate as a valve. The flange portion 12b of the terminal cap 12 is placed on the conductive plate 14. Accordingly, the conductive plate 14 is electrically connected to the peripheral portion 11e of the bottom plate 11 and the flange portion 12b of the terminal cap 12 with a wide contact area.

The outer peripheral edge 14b of the conductive plate 14 is
It is not necessary to join with the one bent portion 11b, and the outer diameter can be made smaller than that of the conventional conductive plate 4. By reducing the outer diameter of the conductive plate 14, the gasket 15 interposed between the flange portion 12 b of the terminal cap 12 and the bent portion 11 b of the bottom plate 11 is connected to the flange portion 1 of the terminal cap 12.
2b is sandwiched between the flanges 12b of the terminal cap 12 and the bent portion 11b of the bottom plate 11, so that the degree of sealing can be increased.

When the bent portion 11b of the bottom plate 11 is swaged with the gasket 15 sandwiching the flange portion 12b of the terminal cap 12, the flange portion 12b of the terminal cap 12 presses the conductive plate 14 and the conductive plate 14 is pressed. The plate 14 presses the thin plate 13. Even if the upper surface of the thin plate 13 slightly protrudes from the upper surface of the bottom plate 11, since the thin plate 13 is made of a metal laminate resin, the thin plate 13 pressed by the conductive plate 14 is compressed, and the upper surface of the thin plate 13 is compressed. And the upper surface of the peripheral portion 11e of the bottom plate 11 are flush with each other. Moreover, the thin plate 13
Is compressed, the thin plate 13 and the conductive plate 14 come into close contact with each other. Therefore, the thin plate 13 has the concave step 1
1d is hardly peeled off, and the valve operating pressure can be prevented from lowering. Conversely, if the recessed step 11d is deeper than the thickness of the thin plate 13, a gap is formed between the upper surface of the thin plate 13 and the conductive plate 14, so that the valve operating pressure is reduced and the electrolyte tends to leak.

When the thin plate 13 is a metal foil, the bottom plate 1
The thin plate 13 slightly projecting from the upper surface of 1 is not compressed,
The conductive plate 14 and the peripheral edge 11e of the bottom plate 11 are not joined.
However, since the metal foil thin plate 13 has conductivity, the bottom plate 11 and the terminal cap 12 are electrically connected to each other via the joined metal foil thin plate 13 and the conductive plate 14. Further, since the thin plate 13 of the metal foil is fitted into the recessed step 11d, the amount of protrusion of the bottom plate 11 to the upper surface is small, and a gap is formed between the upper surface of the peripheral edge 11e of the bottom plate 11 and the conductive plate 14. Rarely occurs. Therefore, regardless of whether the thin plate 13 is made of a metal laminate resin or a metal foil, the bent portion 11b of the bottom plate 11 is swaged with a strong force, so that the conductive plate 14 is deformed or the bent portion 11b is bent. There is no deformation.

It should be noted that the present invention is not limited to the above embodiments of the invention, but can be variously modified within the scope of the technical matters described in the claims. For example, the sealing body of the battery of the present invention can be applied to not only a cylindrical battery but also a prismatic battery. Further, it is preferable that the depth of the recessed step is provided to be slightly smaller than the thickness of the thin plate, but the thickness may be exactly the same as that of the thin plate.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The bottom plate 1 of Example A1 was used to measure how much the thin plates (3, 3) made of aluminum laminated resin (hereinafter, abbreviated as "thin plates") are displaced on the bottom plates 11, 1.
1 and Comparative Example B1. Example A1 is shown in FIG.
As shown in the figure, the bottom plate 11 was provided with a recessed step 11d, the inner diameter of the bottom plate 11 was 11.5 mm, the outer diameter of the recessed step 11d provided on the bottom plate 11 was 8.5 mm, and the depth was 0.05 mm. On the other hand, in Comparative Example B1, as shown in FIG. 8, the recessed step was not provided in the bottom plate 1, and the inner diameter of the bottom plate 1 was 11.5 mm as in Example A1. In both Example A1 and Comparative Example B1, an aluminum laminate resin having an outer diameter of 8.0 mm and a thickness of 0.07 mm was used as the thin plates 13 and 3. In Example A1, this thin plate 13 was fitted into the recessed step 11d and heat-welded. In Comparative Example B1, the thin plate 3 was heat-welded on the bottom plate 1.

Table 1 summarizes the results of measuring the amount of displacement of the thin plate 13 due to the heat welding, one hundred at a time.

[Table 1]

In the bottom plate 1 of Comparative Example B1, 0 to 0.25 mm
The number of the thin plates 3 having the positional deviation of 47 was 47, the number of the thin plates 3 having the positional deviation of 0.25 mm or more was 53, and 7 of the thin plates 3 were the positional deviation of 1.5 mm or more. On the other hand, in the bottom plate 11 of Example A1, 100% of the thin plates 13 had a displacement of 0 to 0.25 mm. From this result, when the thin plate 3 is thermally welded to the bottom plate 1 on which the recessed step is not provided, there are many cases where the bonding failure occurs.
It has been clarified that when the thin plate 13 is fitted into the recessed step 11d provided therein and is heat-welded, no bonding failure occurs.

Next, thin plates 13 and 3 made of aluminum laminated resin are placed on the bottom plates 11 and 1, and the conductive plates 14 and 3 are placed thereon.
4 and terminal caps 12 and 2 and gaskets 15 and 5
In order to measure the valve operating pressure of the sealing body of the battery in which the bent portions 11b and 1b of the bottom plates 11 and 1 are caulked through the first and second embodiments,
The sealing bodies of the batteries of Comparative Example b1, Comparative Example b2, and Comparative Example b3 were manufactured.

In the embodiment a1, as shown in FIG.
Is provided with a predetermined recessed step 11d, and a predetermined conductive plate 14 is fitted in the recessed step 11d.
As in Example A1, the bottom plate 11 has an inner diameter of 11.5 mm, the outer diameter of the recessed step 11d provided in the bottom plate 11 is 8.5 mm,
The depth is 0.05 mm, the thin plate 13 has an outer diameter of 8.0 mm, and a thickness of 0.0
Use aluminum laminated resin of 7mm and conductive plate 1
4 used a PTC element having an outer diameter of 11 mm and an inner diameter of 5.5 mm.

Comparative Example b1, as shown in FIG. 9, is a battery sealing body in which a predetermined thin plate 3 and a conductive plate 4 are arranged without providing a recessed step on the bottom plate 1, and the bottom plate 1 and a thin plate made of aluminum laminate resin. Reference numeral 3 is the same as that of Comparative Example B1, and a PTC element having an outer diameter of 11 mm and an inner diameter of 5.5 mm is used as the conductive plate 4 as in Example a1.

In Comparative Example b2, as shown in FIG.
Is provided with a deep recessed step 11d, a predetermined thin plate 13 is fitted into the recessed step 11d, and a conductive plate 14 is disposed on the thin plate 13. The bottom plate 11 has an inner diameter. Was set to 11.5 mm, the depth of the recessed step 11d was set to 0.1 mm, and the other conditions were the same as in Example a1.

In Comparative Example b3, as shown in FIG.
Is provided with a predetermined recessed step 11d, and a battery sealing body in which a conductive plate 14 is arranged so as not to overlap with a thin plate 13 made of an aluminum laminated resin fitted into the recessed step 11d. The PTC element having an outer diameter of 11 mm and an inner diameter of 8.5 mm was used.
Same as 1.

The sealing body of each battery was put in an atmosphere of 23 ° C. and 80 ° C. for 2 hours, taken out at room temperature, and the measured valve operating pressure is summarized in Table 2.

[Table 2]

The sealing body of the battery in Comparative Example b1 shows a good valve operating pressure. Here, Example a1, Comparative Example b2, and Comparative Example b3 are compared with Comparative Example b1. The sealing body of the battery in Example a1 has almost the same valve operating pressure at 23 ° C. and the same valve operating pressure at 80 ° C. as compared with the sealing body of the battery in Comparative Example b1. Therefore, it has been clarified that the sealing body of the battery of the present invention in Example a1 can obtain the same quality as the sealing body of a conventional good battery.

However, the sealed body of the battery in Comparative Example b2 was 23 ° C. in comparison with the sealed body of the battery in Comparative Example b1.
Is slightly lower valve operating pressure, about 80% at about 2/3
Low valve operating pressure. In the sealing body of the battery in Comparative Example b2, since the concave step 11d is deeper than the thickness of the thin plate 13, the force with which the conductive plate 14 presses the thin plate 13 is small,
It is considered that the welded portion between the thin plate 13 and the bottom plate 11 peeled off earlier than the thin plate 13 ruptured, gas escape occurred from the peeled portion, and the valve operating pressure decreased.

In the battery sealing body of Comparative Example b3, the valve operating pressure was significantly reduced at both 23 ° C. and 80 ° C. as compared with the battery sealing body of Comparative Example b1. This is probably because the thin plate 13 is not pressed by the conductor 14 of the PTC element. Especially at 80 ° C,
It is considered that the resin portion of the thin plate 13 made of the aluminum laminated resin is softened and the welding surface is more easily peeled off than at 23 ° C.

As described above, although the battery plugs of Comparative Examples b2 and b3 cannot be used, the battery plugs of Example 1 can be used favorably.

The thin plate 13 made of aluminum laminated resin
Is pressed by the conductor 14 of the PTC element, and considering the contact between the conductor 14 of the PTC element and the bottom plate 11, the depth of the recessed step 11d formed in the bottom plate 11 is
0.02mm thicker than the thickness of the thin plate 13 made of aluminum laminated resin
The following is preferred.

[0043]

According to the present invention, a recessed step is provided on the surface of the bottom plate in which a through hole for venting is formed, and the thin plate is fitted into the recessed step, so that the thin plate is inserted into the recessed step. And can be fixed without displacement.
Further, the gap between the bottom plate and the conductive plate is almost eliminated, and the force for caulking the bent portion of the bottom plate can be increased. Therefore, not only the yield of the battery sealing body can be improved, but also a thin plate smaller in size than the conventional one can be adopted, and the productivity of the thin plate can be improved.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a bottom plate and a thin plate constituting a sealing body of a battery according to the present invention.

FIG. 2 is a front sectional view of a battery sealing body according to the present invention.

FIG. 3 is an enlarged front sectional view of a main part of a sealing body of a battery according to the present invention.

FIG. 4 is an enlarged front sectional view of a main part of a sealing body of a battery of a comparative example.

FIG. 5 is an enlarged front sectional view of a main part of a sealing body of a battery according to a comparative example different from FIG.

FIG. 6 is a front sectional view of a bottom plate and a thin plate constituting a conventional battery sealing body.

FIG. 7 is a front sectional view of a conventional battery sealing body.

8 is a front sectional view of a bottom plate and a thin plate constituting a conventional battery sealing body different from FIG.

FIG. 9 is a front sectional view of a conventional battery sealing body different from FIG. 7;

[Explanation of symbols]

 Reference Signs List 11 bottom plate 11a through hole 11d concave step 12 terminal cap 12a bottomed cylindrical portion 12b flange portion 13 thin plate 13a peripheral portion 14 conductive plate 14a through hole 15 gasket

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshiro Furuhashi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 5H011 AA09 CC02 CC06 CC08 CC10 DD05 DD13 DD15 KK01 5H012 AA01 BB02 BB11 DD01 EE01 EE04 EE09 FF01 GG01 JJ01

Claims (4)

[Claims] 1. A bottom plate having a through hole for venting gas,
In a battery sealing body having a thin-film thin plate that closes the through-hole and bursts when a pressure equal to or more than a predetermined value is applied, a concave step in which the thin plate is fitted on one surface of the bottom plate so as not to be displaced. A battery sealing body characterized by being provided with: 2. A bottom plate having a through hole for degassing,
A thin plate-shaped conductive plate having a through hole for degassing, and a thin film thin plate that closes a through hole formed in the bottom plate and bursts when a pressure equal to or more than a predetermined value is applied, In a battery sealing body having a structure in which a thin plate is sandwiched between the bottom plate and the conductive plate and the bottom plate and the conductive plate are aligned so that the respective through holes communicate with each other, the side on which the conductive plate is disposed A battery sealing body, characterized in that a recessed step for fitting a thin plate so as not to be displaced is provided at a depth of a slightly smaller thickness than the thin plate on a surface of the bottom plate. 3. A bottom plate having a through hole for venting gas,
A thin plate-shaped conductive plate having a through hole for degassing, a thin-film thin plate that closes a through hole formed in the bottom plate and bursts when a pressure equal to or more than a predetermined value is applied, and a bottomed cylindrical plate A terminal cap provided with a flange portion at the opening edge of the portion, wherein the thin plate is sandwiched between the bottom plate and the conductive plate,
The bottom plate and the conductive plate are aligned so that the respective through holes communicate with each other, the bottomed cylindrical portion of the terminal cap is located around the through hole of the conductive plate, and the flange portion of the terminal cap is placed on the conductive plate. In the battery sealing body having a structure that is stacked on the bottom plate, the recessed step in which the thin plate is fitted to the surface of the bottom plate on the side where the conductive plate is arranged so as not to be displaced is a depth corresponding to the thickness slightly smaller than the thin plate. And a peripheral portion of the thin plate fitted into the recess step is sandwiched between a flange portion of the terminal cap and a bottom plate via a conductive plate. 4. The conductive plate is sized to protrude a peripheral edge of a flange portion of a terminal cap to be joined, and a peripheral portion of the protruded flange portion is fitted with a gasket having a U-shaped cross section. The battery sealing body according to claim 3, wherein: