JP2014005081A - Opening valve, lid body, vessel body, and vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening valve that can restrain extension or breakage of a thin part against impact, stress and the like during assembly of a vessel, especially stress applied in forming an integrated combination of a lid and a vessel body by caulking such as curling or by bonding of laser and the like, and to provide a lid body, a vessel body and a vessel comprising the opening valve.SOLUTION: An opening valve 14 provided on a vessel comprises: a thin part 20 that is open when specified pressure is applied; and a tilt part 22 that couples the thin part 20 and a lid body 10 of the vessel around the thin part 20 and is tilted toward the lid body 10 from the thin part 20. Thickness of the tilt part 22 is thinner than that of the lid body 10.

Description

  The present invention relates to an open valve, a lid body, a container including the open valve, and a container.

  Examples of the container integrally formed by caulking the lid and the container, such as curling, and joining with a laser or the like, include a battery (battery case), a can, a beverage can, and the like. A container such as a battery or canned container contains a container (in the case of a battery, an electrode body, in the case of a canned or beverage can, food, drinking water, etc.), and then the lid and container. It is manufactured by caulking or joining. An electrode body is an electrochemical element of a battery for charging and discharging.

  For example, when a container is used for a battery, if the battery is placed in an abnormal environment such as overcharge, there is a risk that gas is generated in the container and the container is ruptured. For this reason, the opening valve is provided in the container so that the container may not burst. When the internal pressure of the container rises due to gas generation, the opening valve can be opened by itself to forcibly exhaust the gas in the container to the outside.

  Further, for example, when a container is used for canned foods, beverage cans, etc., the container is provided with an opening valve. The opening valve in this case is mainly for taking out the contents stored in canned food or the like (generally called a pull top).

  Next, the configuration of the opening valve will be described. FIG. 7 is a schematic plan view showing a configuration of a general opening valve provided in the container. FIG. 8 is a schematic cross-sectional view of the opening valve taken along line AA shown in FIG. The opening valve 50 shown in FIGS. 7 and 8 is provided in a container 52 (a part of the container is shown in FIGS. 7 and 8), and has a thin wall portion 54 that opens when a predetermined pressure is applied to the container 52. The crushing groove | channel 56 for making the opening of the part 54 easy is provided.

  Here, the thin wall portion 54 and the crushing groove 56 of the opening valve 50 are set to a thickness that opens when a predetermined pressure is applied to the container 52. For example, the predetermined pressure in the case of a battery is a pressure lower than the pressure at which the container bursts due to gas generation in the container. Moreover, the predetermined pressure in the case of canned foods is a pressure lower than the pressure applied to open the opening valve (pull top part) or the pressure at which the canned foods break down when exposed to abnormal environments such as high-temperature heating. Etc.

  And the opening valve of various structures is proposed so that a thin part and a crushing groove may open when predetermined pressure is applied to a container.

  For example, Patent Document 1 proposes an opening valve having an inclined portion in which an end of a thin portion gradually increases in thickness toward a battery case.

  In addition, for example, Patent Document 2 proposes an opening valve in which a thin portion existing between a thick portion and a thick portion of a rupture plate (open valve) provided in a battery case extends in a radial direction. ing.

  For example, Patent Document 3 proposes an opening valve in which a crushing groove is formed by gradually reducing the thickness of a thick portion of a rupture plate.

  For example, Patent Document 4 proposes an opening valve in which an annular thin portion provided in a gasket for sealing a battery case is formed at an acute angle on the battery inner side with respect to the gasket shaft portion.

  However, in the opening valve of Patent Document 1, since the inclined portion is provided only at the end of the thin portion and the thickness gradually increases, when the impact, stress, or the like is applied during the manufacture of the container, the above inclined portion is provided. In the part, stress or the like cannot be relaxed, and the thin part may be damaged.

  Moreover, in the opening valve of patent documents 2-4, since the thin part and the container are directly connected, when an impact, stress, etc. are added at the time of manufacture of a container, stress etc. are not relieved, but a thin part. In some cases, the thin portion may be damaged.

  In particular, when manufacturing a container that is integrally formed by caulking the lid and the container, such as by curling, or joining by laser or the like, the tensile stress applied to the container during caulking or the like (for example, the arrow X shown in FIG. 8). ) May cause the thin portion to stretch or break. When the thin portion is stretched, the pressure at which the thin portion is opened varies and may be opened at a predetermined pressure or lower.

Japanese Patent Laid-Open No. 10-92397 JP 2000-21380 A JP-A-11-204093 JP 2000-100400 A

  The present invention suppresses stretching or breakage of the thin-walled portion against impact, stress, etc. at the time of manufacturing the container, particularly stress when the lid and the container are integrally formed by caulking or joining by laser or the like. An opening valve that can be used, a lid body, a container, and a container including the opening valve.

  The present invention is an opening valve provided in a container, wherein the opening valve is connected to the thin wall portion and the container around the thin wall portion that opens when a predetermined pressure is applied, And an inclined portion that is inclined from the thin portion toward the container, and the thickness of the inclined portion is thinner than the thickness of the container.

  In the opening valve, it is preferable that the thickness of the inclined portion is approximately the same as the thickness of the thin portion.

  Further, the present invention is a lid for sealing a container, the lid has an opening valve, and the opening valve is formed around a thin portion that opens when a predetermined pressure is applied, and around the thin portion, The thin portion and the lid are connected to each other, and an inclined portion that is inclined from the thin portion toward the lid is provided, and the thickness of the inclined portion is thinner than the thickness of the lid.

  Further, in the lid body, it is preferable that a thickness of the inclined portion is approximately the same as a thickness of the thin portion.

  Further, the present invention is a container sealed by a lid, the container having an opening valve, and the container is formed with a thin part that opens when a predetermined pressure is applied, and the thin part around the thin part. And an inclined part that is inclined from the thin part toward the container, and the thickness of the inclined part is smaller than the thickness of the container.

  Moreover, in the container, it is preferable that the thickness of the inclined portion is approximately the same as the thickness of the thin portion.

  Further, the present invention is a container including a lid and a container, and has an opening valve in at least one of the lid and the container, and the opening valve opens when a predetermined pressure is applied. A thin portion, and an inclined portion that connects the thin portion and the container around the thin portion, and is inclined from the thin portion toward the container. Thinner than the wall thickness.

  In the container, it is preferable that the thickness of the inclined portion is approximately the same as the thickness of the thin portion.

  Moreover, in the said container, it is preferable that the said cover body and a container are integrally formed by joining or caulking.

  According to the present invention, the opening valve provided in the container connects the thin part and the container around the thin part that opens when a predetermined pressure is applied, and tilts from the thin part toward the container. It has an inclined part, and the thickness of the inclined part is thinner than the thickness of the container, so that the impact and stress at the time of assembling the container, especially the lid and container are united by joining such as laser, caulking etc. It is possible to provide an opening valve that can suppress the stretching or breakage of the thin-walled portion against the stress at the time of formation, and a lid, a container, and a container including the opening valve.

It is a model perspective view which shows an example of a structure of the container which concerns on embodiment of this invention. It is a partial schematic plan view which shows an example of a structure of the container which concerns on embodiment of this invention. It is a schematic cross section of the container in the AA line shown in FIG. It is a schematic cross section which shows an example of a structure of the opening valve which concerns on other embodiment of this invention. It is a model perspective view which shows an example of a structure of a nonaqueous electrolyte secondary battery provided with the opening valve which concerns on embodiment of this invention. It is a schematic cross section which shows the structure of the opening valve of the comparative examples 1 and 2. It is a schematic plan view which shows the structure of the general opening valve provided in a container. It is a schematic cross section of the opening valve in the AA line shown in FIG.

  Embodiments of the present invention will be described below.

  FIG. 1 is a schematic perspective view illustrating an example of a configuration of a container according to an embodiment of the present invention. As shown in FIG. 1, the container 1 includes a lid body 10, a container 12, and an opening valve 14. Further, a container (not shown) (for example, an electrode body in the case of a battery, food, drinking water or the like in the case of canning, etc.) is accommodated in the container 12. The container 1 is formed by integrally molding the lid 10 and the container 12 by caulking (caulking portion 16 shown in FIG. 1) such as curling (double winding method). However, the present invention is not necessarily limited to this, and may be joining with a laser or the like, molding with a mold or the like (integral molding of the lid body 10 and the container 12), and the like. From the standpoint of workability in manufacturing the container 1, it is preferable that the lid body 10 and the container 12 are integrally formed by caulking or the like, joining with a laser or the like. In addition, it is more preferable to integrally form by caulking such as curling in view of manufacturing cost.

  In the present embodiment, the opening valve 14 is provided on the lid body 10, but is not limited thereto, and may be provided on the container 12. That is, the opening valve 14 only needs to be provided on at least one of the lid 10 and the container 12.

  FIG. 2 is a partial schematic plan view showing an example of the configuration of the container according to the embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of the container taken along line AA shown in FIG. As shown in FIGS. 2 and 3, the opening valve 14 includes a thin portion 20 in which the crushing groove 18 is formed, and an inclined portion 22 that connects the lid 10 and the thin portion 20.

  The thin part 20 opens when a predetermined pressure is applied. The thickness (thickness) of the thin portion 20 may be appropriately set according to a predetermined pressure applied to the thin portion 20, a material constituting the thin portion 20, and the like. As described above, the predetermined pressure is, for example, a pressure lower than the pressure at which the container 1 bursts due to the generation of gas in the container 1. Taking canned food as an example, the pressure applied to open the opening valve 14 (pull top portion), the pressure lower than the pressure at which the canned food bursts when exposed to abnormal environments such as high temperature heating, etc. is there.

  Although the material which comprises the thin part 20 will not be restrict | limited especially if it has corrosion resistance with respect to solutions, such as water and an organic solvent, it is a container at the point which manufacture of the opening valve 14 is easy. It is preferable to use the same material as that constituting 1. For example, when the battery is taken as an example, aluminum, conductive plastic, nickel-plated steel plate, iron, SUS, and the like can be cited.

  The crushing groove 18 is for facilitating opening of the thin portion 20 when a predetermined pressure is applied. Therefore, if the opening of the thin portion 20 can be facilitated, the shape and depth of the crushing groove 18 are not particularly limited.

  As shown in FIGS. 2 and 3, the inclined portion 22 connects the thin portion 20 and the lid 10 around the thin portion 20, and is inclined from the thin portion 20 toward the lid 10. is there.

  The inclined part 22 shown in FIG. 3 is inclined from the thin part 20 toward the lid 10, and the thin part 20 is arranged inside the container 1, that is, inside the container 1 from the surface of the lid 10. The angle and length are adjusted. As long as the inclined part 22 in this embodiment inclines toward the cover body 10 from the thin part 20, the angle and length of the inclined part 22 are not specifically limited. In the present embodiment, the opening valve 14 is provided on the lid 10 as an example. However, as described above, the opening valve 14 may be provided on the container 12. That is, the inclined portion 22 is inclined from the thin portion 20 toward the container 12, and may be adjusted to an angle and length such that the inclined portion 22 is disposed inside the container 1 from the surface of the container 12. .

  4 (a) and 4 (b) are schematic cross-sectional views showing an example of the configuration of an open valve according to another embodiment of the present invention. The inclined portion 22 shown in FIG. 4A is inclined from the thin portion 20 toward the lid body 10, and the thin portion 20 is arranged outside the container 1, that is, outside the container 1 from the surface of the lid body 10. The angle and length are adjusted. In addition, the inclined portion 22 shown in FIG. 4B is adjusted to an angle and length so that the inclined portion 22 is inclined from the thin portion 20 toward the lid body 10 and the thin portion 20 is accommodated within the thickness of the lid body 10. It may be a thing. The inclined portion applied to the present embodiment is inclined from the thin portion 20 toward the lid body 10 in that the inclined portion 22 can be easily formed, and the thin portion 20 is placed inside or outside the container 1. It is preferable that the angle and length are adjusted so as to be arranged. Further, when the container 1 is manufactured, the thin portion 20 can be prevented from being damaged, so that the thin portion 20 is inclined from the thin portion 20 toward the lid body 10 and the thin portion falls within the thickness of the lid body 10. It is preferable that the angle and length are adjusted.

  The shape of the inclined portion 22 is not limited to a linear shape as shown in FIGS. 3 and 4, and may be a wave shape, a rectangular shape, or the like. However, the inclined portion 22 can be easily formed. The shape is preferably linear.

  Next, the tensile stress applied when caulking the lid and the container will be described. When the lid body 10 and the container body 12 are integrally formed by joining with a laser or the like to be described later, or by caulking such as curling, a tensile stress (from the opening valve 14 toward the caulking portion 16 (shown in FIG. 2) ( For example, an arrow X) shown in FIG. 3 is added. Since the opening valve 14 of the present embodiment includes the inclined portion 22, the tensile stress applied to the thin portion 20 and the crushing groove 18 can be relaxed. This is because the inclined portion 22 is pulled (deformed) by the tensile stress, so that the tensile stress applied to the thin portion 20 and the crushing groove 18 can be relaxed.

  And in order for the inclined part 22 to be pulled by the tensile stress, it is necessary to make the thickness of the inclined part 22 thinner than the thickness of the container 1. When the opening 10 is provided in the lid 10 as in the present embodiment, it is necessary to make it thinner than the thickness of the lid 10. Similarly, when the container 12 is provided with the opening valve 14, it is thinner than the thickness of the container 12, and when each of the lid body 10 and the container 12 is provided with the opening valve 14, each opening valve 14 is provided. 14 is required to be thinner than the wall thickness of the lid body 10 and the container 12. If the thickness of the inclined portion 22 is the same as or thicker than the thickness of the container 1 (the thickness of the lid 10 and the container 12), it becomes difficult for the inclined portion 22 to be pulled due to the tensile stress, and the thin portion 20 and A tensile stress may be transmitted to the crushing groove 18 and the opening valve 14 may be opened.

  The thickness of the inclined portion 22 (thickness B of the inclined portion 22 shown in FIG. 3) may be thinner than the thickness of the container 1 (thickness D of the lid 10 shown in FIG. 3). The ratio (B / D) between the thickness B of the inclined portion 22 and the thickness of the container 1 (thickness D of the lid body 10) is 0.03 to 0.0. A range of 5 is preferable.

  The thickness of the inclined portion 22 is more preferably about the same as the thickness of the thin portion 20. If the thickness of the inclined portion 22 is too thicker than the thin portion 20, it becomes difficult for the inclined portion 22 to be pulled due to the tensile stress, and the tensile stress is transmitted to the thin portion 20 and the crushing groove 18 to open the opening valve 14. May end up. Moreover, when it is thinner than the thin part 20, the inclined part 22 may be damaged by tensile stress.

  The thicknesses of the inclined portion 22 and the thin portion 20 are approximately equal to the thickness of the thin portion 20 (thickness A of the thin portion 20 shown in FIG. 3) and the thickness of the inclined portion 22 (the inclined portion shown in FIG. 3). The ratio (B / A) to the thickness B) of 22 is preferably in the range of 0.05 to 1.5. When the ratio (B / A) of the thickness (A) of the thin portion 20 and the thickness (B) of the inclined portion 22 is lower than 0.05, the inclined portion 22 is moved at a pressure lower than a predetermined pressure applied to the container 1. When it is higher than 1.5, when the lid 10 and the container 12 are caulked, the thin wall portion 20 and the crushing groove 18 extend, and the thin wall portion is at a pressure lower than a predetermined pressure applied to the container 1. 20 and crushing groove 18 may open.

  Further, the thickness A of the thin portion 20 is thinner than the thickness of the container 1 (thickness D of the lid 10 shown in FIG. 3), similar to the inclined portion 22, and the thickness A of the thin portion 20 is The ratio (B / D) to the thickness of the container 1 (thickness D of the lid 10) is preferably in the range of 0.03 to 0.5.

  Furthermore, the thickness A of the thin portion 20 and the thickness B of the inclined portion 22 are thinner than the thickness of the groove portion 18 (thickness C of the groove portion 18 shown in FIG. 3).

  The opening valve 14 performs, for example, a pressing process for pressing a metal mold or the like of a concavo-convex member, a plastic process such as a forging process on the container 1 (the lid body 10 or the container 12), so that the thin portion 20 and the inclined portion 22 are formed. After the forming, the thin-walled portion 20 is obtained by forming a crushing groove 18 by performing plastic processing such as coining. However, the formation method of the opening valve 14 is not limited to the above.

  The container according to the present embodiment is used for a cover and a container that are integrally formed by caulking, for example, a battery (described later), a can, a beverage can, and the like.

  A battery will be described as an example of application of the container of the present embodiment. The battery is a non-aqueous electrolyte secondary battery, an alkaline secondary battery, and various primary batteries. Hereinafter, the non-aqueous electrolyte secondary battery will be described as an example.

  FIG. 5 is a schematic perspective view illustrating an example of a configuration of a nonaqueous electrolyte secondary battery including the opening valve according to the embodiment of the present invention. As shown in FIG. 5, the nonaqueous electrolyte secondary battery 2 includes a sealing plate (lid body) 24, an outer can (container) 26, and the opening valve 14 described above. The nonaqueous electrolyte secondary battery 2 is obtained by housing an electrode body (not shown) in an outer can 26 and caulking the outer can 26 and the sealing plate 24 (caulking portion 28 shown in FIG. 5). .

  As described above, the opening valve 14 is not necessarily provided on the sealing plate 24 and may be provided on the outer can 26. The opening valve 14 is the same as that described above (for example, the opening valve 14 shown in FIGS. 3 and 4).

  The sealing plate 24 is provided with terminal holes (not shown) and liquid injection ports (not shown). Electrode terminals 32 a and 32 b are inserted into the terminal holes via an insulating material 30. Further, the liquid injection port is closed by a plug 34.

The electrode body is an electrochemical element of the non-aqueous electrolyte secondary battery 2 for charging and discharging. Specifically, the electrode body is obtained by winding a positive electrode and a negative electrode through a separator. The positive electrode is, for example, an aluminum foil formed with a positive electrode active material (LiCoO ₂ or the like), and the negative electrode is a copper foil formed with a negative electrode active material (graphite or the like). Further, the separator electrically and physically separates the positive electrode and the negative electrode, and for example, a porous resin film such as a polyethylene resin film can be used.

  Next, an example of a method for producing a nonaqueous electrolyte secondary battery will be described.

A positive electrode lead is welded to the positive electrode described above, and a negative electrode lead is welded to the negative electrode. The positive electrode lead and the negative electrode lead are welded to electrode terminals 32 a and 32 b provided on the sealing plate 24. The electrode body is accommodated in the outer can 26, and the sealing plate 24 and the outer can 26 are sealed by caulking or the like. And electrolyte solution is inject | poured from the injection hole (not shown) provided in the sealing board. After injecting the electrolytic solution, the injection port is closed with a plug 34. As the electrolytic solution, for example, a solution obtained by dissolving LiPF ₆ in a mixed solvent of ethylene carbonate and dimethyl carbonate can be used.

  As described above, in the present embodiment, the opening valve provided in the container is inclined from the thin part toward the container, and includes an inclined part having a thickness similar to the thickness of the thin part. When the (sealing plate) and the container (exterior can) are caulked or joined, the tensile stress applied to the thin portion can be relaxed. Therefore, extension and breakage of the thin wall portion and the crushing groove can be suppressed by the tensile stress. Furthermore, since the impact such as the drop of the container can be reduced, the opening valve can be prevented from being damaged by the impact caused by the drop of the container.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples unless the gist thereof is changed.

<Example>
The plate material (thickness: 0.8 mm) is pressed to form the thin portion 20 and the inclined portion 22 shown in FIG. 3, and the thin portion 20 is subjected to coining to form the crushing groove 18, and the opening Valve 14 was made. The thickness of the thin portion 20 of the opening valve 14 was 0.15 mm, and the thickness of the inclined portion 22 was 0.1 mm. This was taken as an example.

<Comparative Examples 1 and 2>
6A is a schematic cross-sectional view showing the configuration of the open valve of Comparative Example 1, and FIG. 6B is a schematic cross-sectional view showing the configuration of the open valve of Comparative Example 2. In Comparative Example 1, the plate material 42 (thickness: 0.8 mm) is pressed to form the thin portion 36, the thin portion 36 is coined to form the crushing groove 38, and the opening valve 44 Is produced. The thickness of the thin portion 36 of the opening valve 44 was 0.15 mm. In Comparative Example 2, the plate material 46 (thickness: 0.15 mm) was subjected to coining to form the crushing groove 40, and the opening valve 48 was produced.

<Evaluation of valve opening pressure>
The valve opening pressure after production of Example 1 and Comparative Examples 1 and 2 above, and Examples 1 and Comparative Examples 1 and 2 and the container (thickness: 0.5 mm) were curled to form a container (container as shown in FIG. 1) The valve opening pressure after the formation was measured, and the valve opening pressure was evaluated based on the following criteria. The results are summarized in Table 1.

<Evaluation criteria>
○: There is almost no difference in the valve opening pressure (MPa) between the production of the open valve and the curling.
(Triangle | delta): The difference was seen in the valve opening pressure after an opening valve preparation, and after curling.
X: The opening valve after curling was damaged.

  As can be seen from Table 1, in the examples, there was almost no difference in the valve opening pressure after the opening valve was produced and after the curling. On the other hand, in Comparative Example 1, there was a difference in the valve opening pressure after the opening valve was created and after the curling, or the opening valve after the curling was damaged. Moreover, in the comparative example 2, all the open valves after curling were damaged.

  As described above, the opening valve that includes the inclined portion that is inclined from the thin portion toward the container and has a thickness smaller than the thickness of the container can suppress a decrease in the valve opening pressure after curling. Therefore, even if the opening valve is formed in a container formed by caulking of the lid and the container, for example, a battery, a can, a beverage can, etc., the opening valve is damaged during the manufacture of the battery, etc. It is possible to suppress a decrease in the valve opening pressure.

  1,52 container, 2 non-aqueous electrolyte secondary battery, 10 lid, 12 container, 14, 44, 48, 50 open valve, 16, 28 caulking part, 18, 38, 40, 56 crushing groove, 20, 36 , 54 Thin wall part, 22 Inclined part, 24 Sealing plate, 26 Exterior can, 30 Insulating material, 32a, 32b Electrode terminal, 34 Sealing plug, 42, 46 Plate material.

The present invention is an opening valve provided in a container, wherein the opening valve is connected to the thin wall portion and the container around the thin wall portion that opens when a predetermined pressure is applied, An inclined portion that is inclined in only one direction from the thin portion toward the container, and the thickness of the inclined portion is thinner than the thickness of the container.

Further, the present invention is a lid for sealing a container, the lid has an opening valve, and the opening valve is formed around a thin portion that opens when a predetermined pressure is applied, and around the thin portion, The thin portion and the lid are connected to each other, and an inclined portion that is inclined in only one direction from the thin portion toward the lid is provided, and the thickness of the inclined portion is thinner than the thickness of the lid. .

Further, the present invention is a container sealed by a lid, the container having an opening valve, and the container is formed with a thin part that opens when a predetermined pressure is applied, and the thin part around the thin part. And an inclined part that is inclined in only one direction from the thin part toward the container, and the thickness of the inclined part is thinner than the thickness of the container.

Further, the present invention is a container including a lid and a container, and has an opening valve in at least one of the lid and the container, and the opening valve opens when a predetermined pressure is applied. A thin portion, and an inclined portion that connects the thin portion and the container around the thin portion and is inclined in only one direction from the thin portion toward the container, and the thickness of the inclined portion Is thinner than the wall thickness of the container.

Claims (9)

An opening valve provided in the container,
The opening valve is a thin portion that opens when a predetermined pressure is applied, and
Around the thin portion, the thin portion and the container are connected, and an inclined portion that is inclined from the thin portion toward the container,
The opening valve characterized in that the thickness of the inclined portion is thinner than the thickness of the container.   2. The opening valve according to claim 1, wherein a thickness of the inclined portion is substantially the same as a thickness of the thin portion. A lid for sealing the container, the lid having an open valve;
The opening valve is a thin portion that opens when a predetermined pressure is applied, and
Around the thin portion, the thin portion and the lid are connected, and an inclined portion that is inclined from the thin portion toward the lid,
The thickness of the said inclination part is thinner than the thickness of the said cover, The cover characterized by the above-mentioned.   4. The lid according to claim 3, wherein a thickness of the inclined portion is approximately the same as a thickness of the thin portion. A container sealed by a lid, the container having an open valve;
The opening valve is a thin portion that opens when a predetermined pressure is applied, and
Around the thin portion, the thin portion and the container are connected, and an inclined portion that is inclined from the thin portion toward the container,
The container is characterized in that a thickness of the inclined portion is thinner than a thickness of the container.   6. The container according to claim 5, wherein a thickness of the inclined portion is approximately the same as a thickness of the thin portion. A container having a lid and a container, and having an opening valve in at least one of the lid and the container;
The opening valve is a thin portion that opens when a predetermined pressure is applied, and
Around the thin portion, the thin portion and the container are connected, and an inclined portion that is inclined from the thin portion toward the container,
The thickness of the said inclination part is thinner than the thickness of the said container, The container characterized by the above-mentioned.   The container according to claim 7, wherein a thickness of the inclined portion is approximately the same as a thickness of the thin portion.   The container according to claim 7 or 8, wherein the container is integrally formed by joining or caulking the lid and the container.

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