KR102051683B1 - Sealing container - Google Patents

Abstract

Provided is a sealed container that can stably obtain high barrier performance.
Laminate packaging materials 10a and 10b having the thermoplastic resin layer 14 laminated on at least one side of the barrier layer 13 overlap with the thermoplastic resin layer 14 inward, and the peripheral edges of the laminated packaging materials 10a and 10b overlapped. It is a sealed container in which the accommodating part 16 is formed by joining and sealing a part, The sealing part 31 of the said peripheral part joins the heat-sealing part 33 and the barrier layer 13 by which the thermoplastic resin layer 14 was welded. It has a plurality of barrier layer bonding portion 34, the plurality of barrier layer bonding portion 34 is arranged in a spot shape so as not to be continuous in the heat seal portion (33).

Description

Sealed Container {SEALING CONTAINER}

This application is accompanied by a priority claim of Japanese Patent Application No. 2012-189015, which is a Japanese patent application filed on August 29, 2012, the disclosure content of which is part of the present application.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed container used for battery cases such as lithium ion secondary batteries, retort pouches for various foods, and the like, and related technologies.

In the packaging of light, oxygen and moisture as described above, a sealed container using a laminate packaging material in which a thermoplastic resin layer is laminated on a metal barrier layer for blocking them is used. As shown in FIG. 1 and FIG. 2, the sealed container 100 is generally manufactured by overlapping the thermoplastic resin layer 14 of the laminate packaging materials 10a and 10b inward and heat-sealing the peripheral portion. As shown in FIG. 11, the peripheral sealing part 101 of the sealing container 100 manufactured by this method is formed by welding the thermoplastic resin layers 14 to each other.

The sealed container 100 is blocked from external light, oxygen, and moisture by the metal barrier layer 13. However, since the thermoplastic resin layer 14 passes through the sealing portion 101 of the sealing container 100 from the outer circumferential end to the inner circumferential end, a small amount of light, oxygen, Moisture may penetrate through the thermoplastic resin layer 14 and enter the accommodating portion 16. Even if these intrusion amounts are small, intrusion into the accommodation section 16 may cause various problems. For example, when oxygen intrudes in a food container such as a retort pouch, the contents deteriorate. In addition, when the electrolyte is packaged like a lithium ion secondary battery, when moisture intrudes, hydrofluoric acid may occur and the sealing performance may be significantly reduced.

In response to this problem, Patent Document 1 proposes a method of strongly pressing the laminated laminate packaging material and sealing the barrier layers to approach or contact linearly along the circumferential direction. According to this sealing method, when the barrier layers approach each other, the narrowed thermoplastic resin layer becomes narrow and rough, and light and the like are difficult to invade. In addition, when the barrier layers are in contact with each other, the thermoplastic resin layer is broken in the middle of the contact point, thereby preventing the intrusion of light or the like (see Patent Document 1).

Japanese Patent Laid-Open No. 2000-264313

The barrier property can be improved by the method of patent document 1. However, even when the barrier layer is approached to form a narrow and steep path, the intrusion cross section is only reduced, so that light cannot be completely blocked. Furthermore, since the transfer method of heat from the heat seal apparatus may vary depending on the outside temperature or the like, it is difficult to stabilize the penetration cross-sectional area, and the barrier performance is also not stabilized. In addition, in order to contact the barrier layers, the resin is pushed out. In the linear contact, the resin can only be pushed out in the uniaxial direction, so the flowability of the resin is poor. For this reason, in order to reliably push out resin and join barrier layers, big pressing force is needed. If the amount of extrusion is insufficient and the resin remains at the bonding interface, it is an intrusion path from the outside. If there is an unbonded portion in a portion of the linear contact portion, the light or the like penetrates the inside through the shortest distance therethrough, and thus the barrier performance becomes unstable.

SUMMARY OF THE INVENTION In view of the above technical background, an object of the present invention is to provide a sealed container capable of stably obtaining high barrier performance and a related technology thereof.

That is, this invention has the structure as described in following [1]-[12].

[1] A laminate packaging material in which a thermoplastic resin layer is laminated on at least one side of a barrier layer is overlapped with the thermoplastic resin layer inward, and is a sealed container in which an accommodating portion is formed by joining and sealing the periphery of the laminated laminate packaging material.

The sealing portion of the peripheral portion has a plurality of barrier layer bonding portions in which the heat seal portion on which the thermoplastic resin layer is welded and the barrier layers are bonded to each other, and the plurality of barrier layer bonding portions are arranged in a spot shape so as not to be continuous in the heat sealing portion. The sealed container characterized by the above-mentioned.

[2] The sealed container according to the above [1], wherein the barrier layer contains a metal.

[3] The sealed container according to the above [1] or [2], wherein at least one barrier layer joining portion exists on an arbitrary straight line orthogonal to the perimeter of the sealing portion.

[4] The sealed container according to any one of [1] to [3], wherein at least one barrier layer contact portion is present on an arbitrary straight line having an angle of less than 45 ° with a straight line orthogonal to the circumference of the sealing portion.

[5] The sealed container according to any one of [1] to [4], wherein a planar shape of the barrier layer bonding portion is a rhombus.

[6] The sealed container according to [5], wherein the planar shape of the barrier layer bonding portion is a rhombus having different lengths of the diagonal, and the diagonal line of the barrier layer bonding portion is arranged along the circumferential direction of the sealing portion.

[7] The sealed container according to any one of [1] to [6], wherein the barrier layer bonding portion is arranged in a plurality of rows in the width direction of the sealing portion.

[8] The sealed container according to any one of [1] to [7], wherein the sealed peripheral portion has a region including only a heat seal portion without a barrier layer bonding portion.

[9] The sealed container according to any one of [1] to [8], wherein the sealed container is a battery case.

[10] A battery, wherein the battery body is loaded in the battery case according to the above [9], and a sealing portion is formed at the periphery of the case with the lead for electrode connected to the battery body drawn out of the case.

[11] a step of overlapping a laminate packaging material in which a thermoplastic resin layer is laminated on at least one side of a barrier layer comprising a metal such that the thermoplastic resin layer is inward;

A heat seal portion forming step of welding the thermoplastic resin layers by sandwiching the periphery of the laminated packaging material between the pressing plates and heating them;

At the periphery of the laminated laminate packaging material, ultrasonic vibration is applied while pressing a jig having projections provided in spot shapes so that a plurality of projections are not continuous on the surface, and the thermoplastic resin layer is pushed out from the tip surface of the projections to expose the barrier layer, The barrier layer junction part formation process which joins the exposed barrier layers is performed,

A method of manufacturing a sealed container, characterized in that a sealing portion is formed in the periphery of the laminated packaging material in which a plurality of barrier layer bonding portions are arranged in a spot shape so as not to be continuous in the heat seal portion.

[12] The method for producing a sealed container according to [11], wherein the barrier layer bonding portion forming step is performed while the thermoplastic resin layer is in a softened state after the heat sealing portion forming step is performed.

According to the hermetically sealed container as described in [1] above, deterioration accelerators such as light, water, and oxygen, which try to penetrate into the container from the end face of the seal, are blocked at the barrier layer junction, so that only the heat seal portion is traced by bypassing the barrier layer junction. . This intrusion path is a narrow, rough path formed between adjacent barrier layer junctions, and therefore has a small cross-sectional area, thereby preventing intrusion of deterioration accelerators. In addition, since the distance to the intrusion path becomes long by the detour, intrusion of the deterioration accelerator is suppressed.

Moreover, since the said barrier layer joining part is formed in the spot shape so that it may not continue in a heat seal part, the whole periphery of a barrier layer joining part is a heat seal part and is a thermoplastic resin. Therefore, when the thermoplastic resin is pushed out to expose the barrier layer in order to bond the barrier layers together, the resin can be pushed out in the entire circumferential direction of the barrier layer bonding portion (preliminary part), so that the resin flows satisfactorily to expose the barrier layer. It is easy. For this reason, a barrier layer junction part can be reliably formed with little pressing force, and also stable barrier performance can be obtained.

In addition, when the bonding force of the barrier layer bonding portion is stronger than that of the heat seals welded with the resins, the sealing portion improves the peeling resistance against stress from the outside.

According to the sealed container according to the above [2], the barrier performance and strength are high because the barrier layer of the laminate packaging material is a metal.

According to the sealed container as described in said [3], since there is no intrusion path which crosses a sealing part in the shortest distance, the distance to an intrusion path can be reliably lengthened.

According to the sealed container as described in said [4], with respect to the straight line orthogonal to the circumference | surroundings of a sealing part, the inclination-angle of a straight intrusion path becomes 45 degrees or more. The greater the inclination angle, the longer the distance to the intrusion path, so that the intrusion inhibiting effect of the deterioration accelerator corresponding to the inclination angle is obtained.

According to the sealed container as described in said [5], since the jig which has the processus | protrusion for forming a barrier layer joining part can be manufactured by wire cut processing, a jig can be manufactured at low cost.

According to the sealed container as described in said [6], with respect to the straight line orthogonal to the circumference | surroundings, the inclination angle of a straight intrusion path | pass becomes 45 degree | times. The greater the inclination angle, the longer the distance to the intrusion path, so that the intrusion inhibiting effect of the deterioration accelerator corresponding to the inclination angle is obtained.

According to the sealed container as described in said [7], since the frequency | count of detour of an intrusion path increases with hot water, the distance of an intrusion path can be made longer.

According to the sealed container as described in the above [8], since the inner circumferential side region of the seal portion is constituted only of the heat seal portion without the barrier layer bonding portion, the contents contact only the thermoplastic resin. Such a sealed container can be safely used for packaging of contents that need to be avoided from contacting the barrier layer.

According to the sealed container as described in said [9], the said effect can be acquired in a battery case.

According to the battery described in the above [10], the barrier performance is high and the stable barrier performance is obtained for the deterioration accelerator.

According to the manufacturing method of the sealed container as described in said [11], the sealed container which has stable barrier performance can be manufactured using the laminated packaging material whose barrier layer is a metal.

According to the manufacturing method of the sealed container as described in said [12], since the thermoplastic resin layer is pressed and crushed by the heat seal part formation process performed first, there is little resin volume pushed out by the ultrasonic bonding of the barrier layer junction part formation process performed later. Therefore, bonding of barrier layers becomes easy. Furthermore, since the resin is easily pushed out by ultrasonic bonding while the resin is in a softened state, the barrier layer bonding portion can be easily formed, and the sealing treatment can be efficiently performed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the state before the sealing process of the battery case which is one Embodiment of the airtight container of this invention.
FIG. 2 is a cross-sectional view of the peripheral edge of the battery case of FIG. 1 for sealing.
3 is a perspective view of a battery using the battery case of FIG. 1.
4A is a plan view of a sealing part of a battery case.
4B is a cross-sectional view of the sealing portion of the battery case.
5 is another embodiment of a seal in a sealed container.
6 is yet another embodiment of a seal in a sealed container.
7 is yet another embodiment of a seal in a sealed container.
8 is yet another embodiment of a seal in a sealed container.
9 is still another embodiment of a seal in a sealed container.
It is sectional drawing which shows the sealing process process in the manufacturing method of the airtight container of this invention.
11 is a cross-sectional view of a peripheral seal of a conventional sealed container.

[Summary of sealed container]

1 and 2 show the state before the sealing process of the battery case 1 with the laminate packaging material, and FIG. 3 shows the battery 2 produced by sealing the battery case 1. The battery case 1 which performed the sealing process is one Embodiment of the airtight container of this invention. In addition, in the following description, it includes the light, oxygen, moisture, etc. which penetrate | invade from the exterior of a sealed container, and deteriorate the content, and is called a "deterioration promotion object."

The battery case 1 recesses two case halves 10a and 10b having a sealing peripheral portion 12 extending from the opening peripheral portion of the rectangular recess 11 in a planar view toward the outer side in a substantially horizontal direction. It is comprised so that the accommodating part 16 may be formed by arrange | positioning so that the opening part of the part 11 may face and joining the overlapping peripheral edge part 12 for sealing. As shown in FIG. 2, the case halves 10a and 10b are laminates in which the thermoplastic resin layer 14 is laminated on one side of the barrier layer 13 and the outer layer 15 is laminated on the other side. The recessed part 11 was shape | molded by drawing on the packaging material, and the assembled case half 10a, 10b is in contact with the thermoplastic resin layers 14 in the periphery 12 for sealing.

[Laminate Packaging]

In the laminate packaging materials 10a and 10b, preferred materials of each layer are as follows.

The material of the barrier layer 13 is not limited as long as it can block the degradation accelerator. As a preferable material of the barrier layer 13, metals, such as aluminum, copper, iron, etc. can be recommended from a high barrier property and high bonding strength. Moreover, ultrasonic bonding can be applied in the sealing process mentioned later by using these metals as a barrier layer material.

Any material can be used as long as the material of the thermoplastic resin layer 14 used as the inner surface of the sealed container can be welded with a thermoplastic resin, and CPP (non-stretched polypropylene) or polyethylene is particularly preferable. Since these thermoplastic resins are easy to soften, they are suitable for the sealing process which pushes resin and joins the barrier layers 13 comrades.

The material of the outer layer 15 is preferably a resin having a higher melting point than that of the thermoplastic resin layer 14, and polyethylene terephthalate or polyamide may be recommended.

As for the laminate packaging material applicable to the sealing container of this invention, the surface which faces the inside of a container is a thermoplastic resin layer 14, and it is a necessary condition to have the barrier layer 13 outside this thermoplastic resin layer 14, If it satisfy | fills this condition, it can be applied also to the packaging material of another laminated structure. Although the presence or absence of the outer layer 15 of the illustrated example is arbitrary, it is preferable to use the laminated packaging material which has the outer layer 15 for the protection of the barrier layer 13. In addition, also in the sealing process mentioned later, if there exists an outer layer 15, damage to the barrier layer 13 at the time of pressurizing between sealing jig can be avoided. Moreover, the laminated structure which has an intermediate | middle layer between the barrier layer 13 and the thermoplastic resin layer 14 or the outer layer 15 may be sufficient.

Although the thickness of each layer which comprises the said laminated packaging materials 10a and 10b is not limited, either, In this invention, since the sealing process which pushes resin of the thermoplastic resin layer 14, and joins barrier layers 13 together is performed, joining is carried out. As long as the strength can be ensured, the thermoplastic resin layer 14 is preferably thinner. From this viewpoint, 10-100 micrometers is preferable and, as for the thickness of the thermoplastic resin layer 14, 20-40 micrometers is especially preferable. In addition, it is preferable that the thickness of the barrier layer 13 is 1/3 or more of the thickness of the thermoplastic resin layer 14. In the sealing process, the laminate packaging materials 10a and 10b are sandwiched between the jig and the resin is pushed out. Therefore, the thickness is preferably within the above range so as not to insulate the barrier layer 13 in this step. Particularly preferred thickness of the outer layer 15 is 10 to 80 mu m.

[Battery using sealed container]

As shown in FIG. 3, in the manufacture of the battery 2 using the battery case 1, the battery main body is accommodated in the recess 11 of one case half body 10b, and the positive electrode and the negative electrode of the battery main body. The case lead body 10a is covered with the other case half 10a in a state in which the lead 20 for a positive electrode and the lead 21 for a negative electrode connected to each other are taken out, and the sealing peripheral part 12 is overlapped and sealing process is performed. The positive lead 20 and the negative lead 21 are arranged between the peripheral edge portions 12 and 12 for sealing in a state sandwiched between the tab films 22 and 23, respectively. Therefore, when the sealing peripheral parts 12 and 12 are sealed, the 1st sealing part 31 formed in the part in which the leads 20 and 21 are not drawn out has the upper and lower sealing peripheral parts 12 and 12 directly. The second sealing portion 32 formed at the portion where the leads 20 and 21 are drawn out is joined to the upper and lower sealing peripheral portions 12 and 12 through the leads 20 and 21 and the tab films 22 and 23. Are bonded. The battery case 1 has a peripheral sealing portion 30 including two first sealing portions 31 and two second sealing portions 32 formed around its entire circumference so that leads 20 and 21 may be formed. It is sealed in the state which was drawn out of the case.

[Sealing part of sealing container]

In the peripheral sealing portion 30, the first sealing portion 31 formed at the portion where the leads 20 and 21 are not drawn out corresponds to the sealing portion in the present invention, and the heat seal portion and the barrier layer It is comprised by the junction part.

As shown in FIGS. 4A and 4B, the first sealing portion 31 is formed by the heat seal 33 and the resin of the thermoplastic resin layer 14 formed by welding the thermoplastic resin layers 14 and 14. It is formed by the many barrier layer joining part 34 pushed out and the barrier layers 13 and 13 joined. While the heat seal portion 33 is formed over the entire width direction of the first sealing portion 31, the barrier layer bonding portion 34 is formed only in the intermediate region 35 in the width direction, and the inner circumference thereof. In the side region 36 and the outer circumferential side region 37, the barrier layer bonding portion 34 does not exist, and only the heat seal portion 33 exists.

Whereas the heat seal portion 33 is continuous in the entire area of the first sealing portion 31 without interruption, the plurality of barrier layer bonding portions 34 are discontinuous with each other and are spot-shaped in the heat seal portion 33. Exists. In addition, the shape of each barrier layer junction part 34 is a rhombus (square) whose length of two diagonals is equal, and two diagonal lines are arrange | positioned along the circumferential direction and the width direction of the 1st sealing part 31. As shown in FIG. In addition, these barrier layer bonding parts 34 are arrange | positioned in multiple rows in the width direction of the sealing part 30, and are arranged in a zigzag shape by meandering in zigzag with respect to both directions of a circumferential direction and a width direction. The arrangement of the barrier layer bonding portion 34 is a rhombic closest arrangement, and the heat seal portion 33 in the intermediate region 35 is inclined lattice shape by the closest arrangement of the barrier layer bonding portion 34.

The deterioration accelerator resulting from the outside of the container is completely blocked by the barrier layer 13, but there is a possibility that a trace amount enters the thermoplastic resin layer 14. Therefore, in the plan view of the first sealing portion 31 shown in FIG. 4A, the deterioration accelerator drawn in from the outer circumferential end face traces only the heat seal portion 33 to reach the container, and the heat seal portion 33 It becomes an intrusion path. The heat seal portion 33 is inserted into the barrier layer bonding portion 34 to have a narrow and steep length, and the penetration of the deterioration accelerator is suppressed because the cross-sectional area of the intrusion path becomes small. Further, the heat seal portion 33 is connected from the outer circumferential end of the first sealing portion 31 to the inner side, but is inclined lattice in the intermediate region 35, so that the penetration accelerators 38 and 39 are deteriorated. Becomes a zigzag course 38 bypassing the barrier layer junction 34 or a meandering straight line 39. The zigzag intrusion path 38 and the meandering straight path 39 are longer than the course S of the shortest distance represented by a straight line orthogonal to the circumference of the first sealing part 31, By lengthening the distance, intrusion of the deterioration accelerator is suppressed. As mentioned above, in the 1st sealing part 31 of this embodiment, invasion is suppressed synergistically by making small the cross-sectional area of the intrusion path of a degradation promotion object, and lengthening the intrusion path, and the barrier property is improved.

In addition, the barrier layer bonding part 34 has stronger bonding force than the heat seal part 33 by which resin was welded. For this reason, the barrier layer junction part 34 is formed in the heat seal part 33, and peeling strength improves with respect to the stress from the outside.

Since the sealing part 31 of the present invention has a plurality of barrier layer joining parts 34 in the spot shape in the heat seal part 33, the width of the heat seal part 33 is substantially the width of the sealing part 31. (W1) (see FIG. 4A). Although the present invention does not limit the width W1 of the sealing portion 31, it is preferable to form the sealing portion 31 having a width W1 of 1 mm or more in order to secure the bonding strength with respect to the internal pressure of the container. In addition, sufficient bonding strength is obtained when the width W1 is 10 mm. Therefore, the width W1 of the preferable sealing part 31 is 1-20 mm. Moreover, since the suitable value of the width W1 of the said sealing part 31 is also influenced by the thickness of the thermoplastic resin layer 14, or the MFR value of resin, it sets suitably within 1-20 mm according to these. It is preferable. Particularly preferred width W1 of seal 31 is 3 to 10 mm.

The inner peripheral end of the sealing portion 31 is preferably formed of only the material of the thermoplastic resin layer 14 because the contents are in contact with each other. Depending on the contents, contact with the material (for example, metal) of the barrier layer 13 must be avoided or preferably avoided. For example, in the case of a battery, it should be avoided that electrolyte solution contacts the metal barrier layer 13. For this reason, it is preferable to form the area | region in which only the heat-sealing part 33 exists, without providing the barrier layer joining part 34 in the inner peripheral area 36 of the sealing part 31, and contact | contacts with a barrier layer is prevented. It can also be used safely to package contents that need to be avoided. The width W2 of the inner circumferential side region 36 is preferably 3 to 15 mm, particularly preferably 5 to 10 mm. On the other hand, the presence or absence of the barrier layer bonding part 34 in the outer peripheral side area 37 of the sealing part 31 is regardless.

As described based on the above embodiment, in the sealing portion 31, the intrusion of the deterioration accelerator can be suppressed by reducing the cross-sectional area of the intrusion path of the deterioration accelerator or by detouring the intrusion path to increase the distance.

The cross-sectional area of the intrusion path may be reduced by reducing the width of the intrusion path, and the reduction of the width of the intrusion path may be achieved by forming a plurality of barrier layer junctions 34 in the heat seal portion 33 discontinuously. Can be realized regardless of the shape and the formation position. Since the width | variety of an intrusion path is the space | interval D between the barrier layer joining parts 34, intrusion of deterioration promoter can be suppressed by narrowing the space | interval D (refer FIG. 4A). On the other hand, as the spacing D between the barrier layer joining portions 34 decreases, processing conditions become stricter such that a large pressure is required to push out the resin, and when the resin is not pushed out, the barrier layers 13 are separated from each other. The barrier layer junction part 34 is not formed because it cannot contact. From this point of view, the interval D between the barrier layer junctions 34 is preferably set in the range of 0.2 to 3 mm, particularly preferably 0.5 to 1.5 mm.

In addition, the size of each barrier layer junction part 34 is preferably 0.2 to 5 mm, particularly preferably 0.5 to 1.5 mm, in terms of the diameter of the circumscribed circle.

In addition, enlargement of the distance to an intrusion path can be implement | achieved by the shape or formation position of the barrier layer junction part 34, or a combination thereof. As shown in Fig. 4A, the shortest intrusion path is on a straight line S orthogonal to the circumference of the sealing part 31, and the distance in the case of crossing the first sealing part 31 at the shortest distance is the sealing part ( Since it is the dimension of the width W1 of 31, if the at least 1 barrier layer junction part 34 exists on the said straight line S, the distance to an intrusion path can be lengthened by bypassing this barrier layer junction part 34. FIG. . Therefore, when the barrier layer junction part 34 is arranged so that at least one barrier junction part 34 exists on an arbitrary straight line S orthogonal to the periphery of the sealing part 31, there is no intrusion path of the shortest distance mentioned above. The entry path is longer than the width W1 of the sealing portion 31. In addition, as shown in FIG. 4A, when the barrier layer bonding portion 34 is formed in a plurality of rows in the width direction of the sealing portion 31, the number of detours increases, so that the distance to the intrusion path can be made longer. However, when the number of hot water increases within the limited width W1, the space | interval D between the barrier layer joining parts 34 also becomes narrow, and since the flow of the extruded resin becomes easy to stay, 20 rows or less are preferable.

The sealing part 40 of FIG. 5 arranges the barrier layer junction part 34 of the form similar to FIG. 4A among heat seal parts 41 rather than a zigzag shape. In this alignment arrangement, the straight line 42 passing between the barrier layer bonding portions 34 adjacent to the circumferential direction is the intrusion path of the shortest distance, and the straight line is represented by a straight line orthogonal to the periphery of the sealing portion 40. Since it is the course S of the shortest distance, the distance to an intrusion path cannot be lengthened. The sealing portion 40 is included in the present invention because a plurality of barrier layer joining portions 34 are formed discontinuously and have an effect of suppressing the penetration of the deterioration accelerator by reducing the cross-sectional area of the intrusion path.

[Other Shape Example and Arrangement Example of Barrier Layer Junction]

The seal parts 45, 50, 55, 60 shown in FIGS. 6-9 are another embodiment of the seal part of this invention.

(1) Fig. 6

The sealing part 45 is an example which arrange | positioned many barrier layer joining parts 47 of parallelogram in the width direction of the sealing part 45 in the heat seal part 46 in one row. At least one barrier junction part 47 on an arbitrary straight line S orthogonal to the periphery of the sealing part 45 by the set value of the space | interval of the inner side of a parallelogram, and the adjacent barrier layer junction part 47 even if it is single-row arrangement | positioning. ) Can be present. In the figure, 48 is the shortest intrusion path.

(2) Figure 7

The sealing part 50 arrange | positions the triangular barrier layer joining part 52 in multiple rows in the width direction of the sealing part 50 in the heat seal part 51, and arrange | positions the direction of a triangle vertex per column This is an example of alternately rotating in reverse. The seal 50 has not only at least one barrier bonding portion 52 on any straight line S orthogonal to the periphery, but also no straight intrusion path, and all of the intrusion paths 53 are zigzag-shaped. Becomes

(3) Figure 8

The sealing part 55 arrange | positions the circular barrier layer joining part 57 in multiple rows in the width direction of the sealing part 55 in the heat seal part 56, and is also about the bidirectional of the circumferential direction and the width direction. It is arranged in a zigzag shape by meandering in zigzag. The sealing part 55 has not only at least one barrier junction part 57 on any straight line S orthogonal to the periphery, but also no straight intrusion path, and all of the intrusion paths 58 are barrier layers. The junction 57 is bypassed to form a winding mountain road shape.

(4) Figure 9

The sealing part 60 arrange | positions the rhombic barrier layer junction part 62 in multiple rows in the width direction of the sealing part 60 in the heat-sealing part 61, and also in both directions of a circumferential direction and the width direction It meanders in a zigzag shape and arranges it in a zigzag shape. The barrier layer bonding portion 62 is a rhombus having different lengths of the two diagonals, and the long diagonals 63 are arranged along the circumferential direction. That is, the barrier layer junction 62 is a rhombus long in the circumferential direction.

Course (S) of the shortest distance represented by the inclination angle (alpha) of the straight intrusion path 64 in the sealing part 60 in which the rhombus was arranged closest, that is, the straight line orthogonal to the periphery of the sealing part 60. And the angle formed by the intrusion path 64 of the straight line is 1/2 angle of the inner angle of the diamond shape. The said cabinet is a pair of cabinets which are on the straight line S orthogonal to the circumference | surroundings of the sealing part 60 among two pairs of cabinets. Therefore, the larger the angle 2α is, the larger the inclination angle α of the intrusion path 64 is, and the longer the distance is, so that the effect of suppressing intrusion of the deterioration accelerator is increased. The cabinet 2α is determined by the length of two diagonals, and the longer diagonal 63 of the two diagonals of the rhombus follows the circumferential direction, and as the difference in the lengths of the diagonals increases, The distance is increased to obtain a distance-invasive suppression effect.

Since the inside angle 2α of the rhombus shown in FIG. 9 is an obtuse angle, the inclination angle α of the intrusion path 64 is over 45 °. Therefore, in the sealing part in which the rhombus is arranged closest, when the rhombus is disposed so that the long diagonal line is along the circumferential direction, the inclination angle α of the straight intrusion path 64 becomes over 45 °. On the other hand, since the barrier layer junction part 34 of the sealing part 31 of FIG. 4A is a rhombus (square) whose two diagonal lengths are equal, the inclination angle (alpha) of an intrusion path is 45 degrees. In other words, at least one barrier layer contact portion 34 exists on any straight line having an angle of less than 45 degrees with a straight line orthogonal to the periphery of the sealing portion 31, and the angle of inclination α is less than 45 degrees. There is no intrusion.

In view of the above, when the rhombic barrier layer junction is most closely arranged, it is preferable to leave the difference between the lengths of the two diagonals and to arrange the longer diagonals in the direction along the circumferential direction. Inhibition effect of water is great. Further, the preferred size of the rhombus is 0.05 to 20 mm in the long diagonal dimension and 0.02 to 10 mm in the short diagonal dimension, particularly preferably 0.5 to 3 mm in the long diagonal dimension and 0.2 to 1.2 mm in the short diagonal dimension.

Further, the longer the inclination angle of the intrusion path with respect to the straight line orthogonal to the circumference of the sealing portion is, the longer the distance of the straight intrusion path is. . Therefore, if at least one barrier layer contact portion is formed on any straight line whose angle with the straight line orthogonal to the periphery of the seal is less than 45 °, there is no intrusion path of the straight line having the inclination angle of less than 45 °, The inclination angle of becomes 45 degrees or more, and the intrusion suppression effect of the degradation accelerator corresponding to the angle is obtained.

[Use of sealed container]

The sealed container of the present invention can be widely used as a container for packaging light, oxygen and moisture of batteries and foods. Moreover, the shape of a sealed container, the presence or absence of the shaping | molding of a sheet-shaped laminated packaging material (with or without recessed part shaping | molding), and the dimension of a sealed container are also irrespective. However, it is preferable to apply it to the container whose planar dimension is 10 mm x 20 mm or more, and thickness is 3 mm or more in order to perform sealing process in the peripheral part of a container. Moreover, it is preferable to apply to the container whose planar dimension is 300 mm x 300 mm or less, and thickness is 50 mm or less.

Moreover, the sealing container of this invention is condition that the sealing part (henceforth abbreviated as "sealing part of this invention") formed in which the several barrier layer joining part is not continuous is formed in at least one part of the periphery, The container in which the sealing part of this invention is not formed is also contained in this invention. For example, as shown in FIG. 3, when applied to a battery case, the electrode lead is drawn out of the container, so that the sealing portion of the present invention is not formed in the lead portion of the electrode lead, and the peripheral portion except the lead portion is provided. Formed. In addition, there is a case where an opening for filling contents is left at the periphery of the container regardless of the contents of the container, and the sealing treatment is performed to close the opening after filling. The container including the opening for filling is also included in the present invention.

[Method for Manufacturing Sealed Container]

Hereinafter, the manufacturing method of the sealing container in case the barrier layer of a laminate packaging material is a metal is demonstrated in detail, referring FIG. 10, taking the sealing process of the sealing part 31 of FIGS. 4A and 4B as an example.

Since the heat seal part 33 is a joining of the thermoplastic resin layers 14, it can be formed by inserting the overlapping periphery part 12 for sealing between the heat-sealing press plates 70 and 71, and heating it (heat seal part formation). fair). The barrier layer bonding part 34 provides ultrasonic vibration while pressing and pressing the jig 73 which has the processus | protrusion which formed the several processus | protrusion 72 corresponding to the shape and arrangement | positioning of the barrier layer bonding part 34, and the projection 72 The resin is pushed out from the distal end face of the N-B) to expose the barrier layer 13 at the bonding interface, and the exposed barrier layers 13 are bonded to each other (barrier layer bonding part forming step). The resin pushed out by the pressing of the protrusions 72 and the ultrasonic vibration flows into the recesses 74 present around the entirety of the protrusions 72, so that the barrier layer 13 is easily exposed. Therefore, the barrier layer junction part 34 can be formed reliably with little pressing force, and also the stable barrier performance can be obtained.

When the said sealing method is demonstrated from the sealing container side, since the said barrier layer joining part 34 is formed in the spot shape so that it is not continuous in the heat seal part 33, the whole circumference | surroundings of the barrier layer joining part 34 is a heat seal part ( 33) and a thermoplastic resin. Therefore, when the thermoplastic resin is pushed out to expose the barrier layer 13 in order to bond the barrier layers 13 with each other, the resin can be pushed out in all directions around the barrier layer bonding part 34 (preliminary part). The resin flows well and it is easy to expose the barrier layer.

By performing the said heat seal part formation process and a barrier layer junction part formation process, the sealing part 31 of this invention can be formed in the periphery of a laminated packaging material. These processes may be performed simultaneously or may be performed sequentially.

In the case where two processes are performed simultaneously in one process, as shown in FIG. 10, as shown in FIG. Ultrasonic vibration is applied to the jig 73 having.

In the case of performing the two steps sequentially, first, the heat seal portion 33 is formed using only the pressing plates 70 and 71 (heat seal portion forming step), and then the barrier is formed using the jig 73 having protrusions. The layer junction part 34 is formed (barrier layer junction part formation process). When the sealing treatment is performed in two steps, the thermoplastic resin layer 14 is pressed and crushed and thinned by the heat seal portion forming step that is performed first, so that the amount of resin that is pushed out by the ultrasonic bonding in the barrier layer bonding portion forming step performed later decreases the barrier layer. (13) Joining of each other becomes easy. Moreover, after performing a heat-sealing part formation process, it is preferable to perform a barrier layer joining part formation process continuously, while resin temperature does not fall. If the resin temperature is high and the ultrasonic bonding is performed while the resin is in a softened state, the resin is easily pushed out, so that the barrier layer bonding portion 34 can be easily formed. The resin softens also by ultrasonic vibration, but by using heat during heat-sealing, the barrier layer bonding portion 34 can be efficiently formed, and the sealing treatment can be performed efficiently.

There is no restriction | limiting in the conditions of the said heat seal and ultrasonic bonding, According to the material and thickness of the thermoplastic resin layer and barrier layer of a laminated packaging material, the use of a sealing container, etc., it sets suitably.

For example, as for the temperature of a heat seal, 140 degreeC or more is preferable when the thermoplastic resin layer 14 is LLDPE (linear low density polyethylene), and 160 degreeC or more is CPP (non-stretched polypropylene). Moreover, in the case of the laminated packaging material which has the outer layer 15 which consists of resin, it is a condition that it is temperature lower than melting | fusing point of resin. When resin which comprises the said outer layer is PET or less, 250 degreeC or less, and when nylon, 230 degreeC or less is preferable. Moreover, 0.2-1.0 MPa is preferable and, as for the pressing force at the time of heat sealing, 2-5 second of a heating time is preferable.

Moreover, as conditions for ultrasonic bonding, frequency: 15-40 kHz, pressing force: 5-20 MPa, energy: 0.5-100 J, ultrasonic irradiation time: 0.1-2 second are preferable.

In the jig 73 having the ultrasonic bonding projection, the shape and arrangement of the front end surface of the projection 72 correspond to the shape and arrangement of the barrier layer bonding portion 34 in the sealing portion 31. The manufacturing method of the jig which has the said process is not limited, The thing produced by arbitrary methods according to a shape can be used. For example, a jig having projections for maximally arranging the rhombic barrier layer junctions 34 and 62 of FIGS. 4A and 9 or projections for aligning the parallelogram barrier layer junctions 47 of FIG. 6 are arranged. The jig which has can be manufactured by cutting the part corresponding to the heat-sealing part 33, 61, 46 between the adjacent barrier layer joining parts 34, 62, 47 by a wire cut process. The jig which can be produced by wire cut processing is limited to the shape in which the barrier layer bonding portion does not exist on the cut line, but there is an advantage that it can be manufactured at low cost because the processing to the required shape is easy.

4A, 9, and 6, the sealing portions 31, 60, and 45 by the jig having projections that can be produced by wire cutting process the straight intrusion paths 39, 64, and 48. Although the inclination-angle (alpha) is enlarged so that the distance of the intrusion paths 39, 64, and 48 may become long, the invasion suppression effect of a deterioration promoter can be enlarged. For example, in closest arrangement to a rhombic barrier layer joining portion, the diagonal of the longer one of the two diagonals is along the circumferential direction, and the larger the difference between the lengths of the diagonals, the larger the inclination angle α.

This invention can be used suitably as a case for lithium ion secondary batteries, a retort pouch of a foodstuff, etc.

1: battery case (sealed container)
2: battery
10a, 10b: case half (laminate packaging material)
11: recess
12: perimeter for sealing
13: barrier layer
14: thermoplastic resin layer
15: outer layer
16: receptacle
20: positive lead
21: lead for negative electrode
30: peripheral seal
31: first sealing part (sealing part)
33, 41, 46, 51, 56, 61: heat seal part
34, 47, 52, 57, 62: barrier layer junction
36: inner circumference region
40, 45, 50, 55, 60: seal
63: diagonal on the long side
70, 71: heat seal pressing plate
72: turning
73: jig with protrusion

Claims (12)

A laminate packaging material in which a thermoplastic resin layer is laminated on at least one side of a barrier layer is a sealed container in which an accommodating portion is formed by overlapping a thermoplastic resin layer inward and bonding and sealing the periphery of the laminated laminate packaging material.
The sealing portion of the peripheral portion has a plurality of barrier layer bonding portions in which the heat seal portion in which the thermoplastic resin layer is welded and the barrier layers are bonded to each other, and the plurality of barrier layer bonding portions are arranged in a spot shape so as not to be continuous in the heat sealing portion. The sealed container characterized by the above-mentioned. The sealed container according to claim 1, wherein the barrier layer comprises a metal. The sealed container according to claim 1, wherein at least one barrier layer junction is present on any straight line orthogonal to the circumference of the seal. The sealed container according to claim 1, wherein at least one barrier layer joining portion is present on any straight line whose angle with a straight line orthogonal to the circumference of the sealing portion is less than 45 °. The sealed container according to claim 1, wherein the planar shape of the barrier layer bonding portion is a rhombus. The sealing container of Claim 5 in which the planar shape of the said barrier layer junction part is a rhombus with a diagonal length different, and the said diagonal barrier part is arrange | positioned along the circumferential direction of a sealing part in a long diagonal direction. The sealed container of Claim 1 in which the barrier layer joining part is arrange | positioned in multiple rows in the width direction of the said sealing part. The sealing container of Claim 1 which has the area | region which consists only of a heat-sealing part, without having a barrier layer junction part in the inner peripheral side area | region of the said sealing part. The sealed container according to any one of claims 1 to 8, wherein the sealed container is a battery case. The battery body is loaded in the battery case of Claim 9, and the sealing part is formed in the periphery of the said case in the state in which the electrode lead connected to the said battery body was drawn out of the case. A step of laminating a laminate packaging material in which a thermoplastic resin layer is laminated on at least one side of a barrier layer comprising a metal such that the thermoplastic resin layer is inward, and
A heat seal portion forming step of welding the thermoplastic resin layers by sandwiching the periphery of the laminated packaging material between the pressing plates and heating them;
At the periphery of the laminated laminate packaging material, ultrasonic vibration is imparted while pressing a jig having protrusions provided in a spot shape so that a plurality of protrusions are not continuous on the surface, and the thermoplastic resin layer is pushed out from the tip end surface of the protrusions to expose the barrier layer, The barrier layer junction part formation process which joins the exposed barrier layers is performed,
A method of manufacturing a sealed container, characterized in that a sealing portion is formed in the periphery of the laminated packaging material in which a plurality of barrier layer bonding portions are arranged in spots so as not to be continuous in the heat seal portion. The manufacturing method of the sealed container of Claim 11 which performs a barrier layer joining part formation process, after performing the said heat-sealing part formation process, and a thermoplastic resin layer is in a softening state.

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