JP4956854B2 - Sealed battery and method of manufacturing sealed battery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealed battery and a method for manufacturing a sealed battery, and a sealed battery in which a power generating element is temporarily accommodated in a sealed battery package and then the power generating element is impregnated with an electrolytic solution and then the power generating element is accommodated and sealed. And a method of manufacturing a sealed battery.
[0002]
[Prior art]
A sealed battery 80 shown in FIG. 8 includes a power generation element 81 in which a positive electrode and a negative electrode are laminated via a gel electrolyte layer, a positive electrode terminal 82 and a negative electrode terminal 83 connected to the positive electrode and the negative electrode, respectively, and an electrolyte layer. In order to prevent external leakage and internal entry of outside air, it has a sealed battery package 84 that houses and seals the power generation element 81 so that the open end of the positive electrode terminal 82 and the open end of the negative electrode terminal 83 are exposed to the outside. ing.
[0003]
The power generation element 81 is an elliptical column winding type in which a positive electrode and a negative electrode stacked via a separator are wound and then pressed in the radial direction.
Since this power generation element 81 is difficult to roll the positive electrode, the negative electrode and the separator through the gelled electrolytic solution, or to stack the positive electrode, the negative electrode and the separator and then absorb the electrolytic solution in advance, The polymer to be converted is added to the power generation element, and the power generation element is impregnated with an electrolyte solution to be gelled, or a polymerizable monomer is added to the electrolyte solution and the power generation element is impregnated as appropriate. The electrolytic solution is polymerized and gelled by various means.
[0004]
The sealed battery package 84 includes a metal foil core material made of aluminum foil, a polyester resin such as polyethylene terephthalate (PET) along the surface of the metal foil core material, a polyamide resin such as nylon, or a protective layer made of polyimide resin. A metal resin composite film 85 in which a metal-bonding fusible resin layer made of polyolefin resin such as polypropylene (PP) or polyethylene (PE) along the back surface of the metal foil core material is laminated is often used.
[0005]
Such a sealed battery 80 is formed by forming a depression 86 corresponding to the shape of the power generation element 81 in one of a pair of metal resin composite films 85, 85 formed in a rectangular shape in advance. The power generating element 81 is sandwiched between the composite films 85, 85 in the thickness direction, and then the four sides of each metal resin composite film 85, 85 are heated and pressed in the thickness direction to fuse the fusible resin layers together. After forming the fusion allowance 87 having a predetermined width dimension and forming the injection port 88 without fusing part of the opposite sides of the positive electrode terminal 82 and the negative electrode terminal 83, the electrolyte is generated from the injection port 88. The element 81 is impregnated (see arrow in FIG. 8).
Next, as shown in FIG. 9, the liquid injection port 88 is fused and sealed with a pair of molds 89 and 89 to form a liquid injection port fusion allowance 90, thereby accommodating and sealing the power generation element 81.
[0006]
When impregnating the power generation element 81 with the electrolytic solution from the liquid injection port 88, a suction port similar to the liquid injection port 88 is formed in advance on the opposite side of the liquid injection port 88, and the electrolytic solution is supplied from the liquid injection port 88. By injecting and sucking from the suction port, the impregnation rate of the electrolytic solution into the power generation element 81 may be increased, and the power generation element 81 may be accommodated and sealed by fusing and sealing the liquid injection port and the suction port.
[0007]
[Problems to be solved by the invention]
By the way, in the above-described sealed battery 80, when the power generation element 81 is impregnated with the electrolytic solution from the liquid injection port 88, the electrolytic solution 91 may adhere to the inner surface of the liquid injection port 88 as a droplet (FIG. 9). (See (A)).
In this case, when the liquid injection port 88 is fused and sealed, the electrolyte 91 is present at the interface of each fusible resin layer, so that the fusion strength of the liquid injection port 90 is reduced, resulting in poor sealing. There is a risk that this will occur (see FIG. 9B).
[0008]
The present invention has been made in view of the above-mentioned problems, and the purpose thereof is to inject liquid even after the liquid injection port is fused and sealed after the power generation element in the sealed battery package is impregnated with the electrolytic solution. An object of the present invention is to provide a sealed battery and a method for manufacturing the sealed battery, which can reduce the possibility of poor sealing in the mouth fusion allowance.
[0009]
[Means for Solving the Problems]
The sealed battery of the present invention has a power generation element in which a positive electrode and a negative electrode are stacked via an electrolyte layer, and a sealed battery package that houses the power generation element,The sealed battery package has a metal foil core material and a fusible resin layer,Of the sealed battery packageFusible resin layerIt is premised on a sealed battery in which the power generating element is accommodated and sealed by a fusion allowance for fusing together. In order to achieve the above-described object, the sealed battery according to the present invention comprises:And as described in Claim 2, the fusible resin is extracted from the width direction edge part in at least one part of the said fusion allowance. Here, the fusible resin only needs to be squeezed out from one end part in the width direction of the fusion allowance or both end parts in the width direction, even if both surfaces in the thickness direction in the fusion allowance are flat and parallel to each other. Good. In such a sealed battery, since the fusible resin is squeezed from the end portion in the width direction of the fusion allowance, for example, if the fusible resin is squeezed from the end portion in the width direction of the fusion allowance, It can be confirmed from the outside that the film part or the fusible resin layer constituting the inner surface of the liquid inlet flows toward the one end in the width direction of the liquid inlet fusion allowance, and the power generation element side of the fusion allowance If the fusible resin is squeezed out from the end portion, the gap in the sealed battery package can be filled.
[0010]
Here, the part of the fusion allowance includes an injection opening fusion allowance in which a temporarily formed injection inlet is fused in order to inject the electrolyte into the sealed battery package. It refers to any position of the fusion allowance. Such a fusion allowance is such that, for example, the cross-sectional shape along the width direction is substantially concave so that the thickness dimension at the center portion in the width direction is smaller than the thickness dimension at one end portion in the width direction or both end portions in the width direction. Or to taper toward the end in the width directionIt is preferable to leave.
[0011]
In order to obtain such cross-sectional shapes, among the pair of molds used for fusing and sealing the injection port, the center part of the mold surface of one mold should be protruded from the end part. What is necessary is just to show a convex circular arc surface, the slope which cross | intersects the direction which mutually adjoins as a specific type | mold surface form.
Moreover, in order to make the cross-sectional shape of the fusion allowance a desired shape, one of the pair of molds is brought into contact with only one end side in the axial direction of the liquid inlet, and then contacted with the outer surface of the liquid inlet. The mold surface may be slidably moved or rolled toward the other end in the axial direction of the liquid injection port while maintaining this state.
[0012]
At this time, in order to secure a minimum thickness dimension of the fusion allowance, the fusion resin layer in the region corresponding to the inner surface of the liquid inlet is previously thickened in advance on the inner surface of the sealed battery package. You just have to make it.
Specifically, an appropriate fusible resin film part may be provided at an appropriate location by coating or sticking, and when the liquid injection port is fused and sealed, the film part is fused while the film part is fused. What is necessary is just to make it flow to the width direction one end part or the width direction both ends.
When the film part is provided on the inner surface of the liquid injection port, the film part and the fusible resin layer constituting the inner surface of the sealed battery package may be made of the same material. The material may be used.
[0013]
In the sealed battery configured in this way, since the thickness dimension of the center portion in the width direction in at least a part of the fusion allowance is smaller than the thickness dimension of the end portion in the width direction, the liquid injection temporarily formed Even if electrolyte droplets adhere to the inner surface of the mouth, the fusion-bonding resin layer constituting the sealed battery package or the film portion provided on the inner surface of the inlet is not used for fusing and sealing the liquid inlet. The liquid flows toward one end in the width direction or both ends in the width direction of the injection hole so as to push away the splash of the electrolyte while melting.
Therefore, in such a sealed battery, at least a part of the inner surface of the injection port is fused and sealed as an interface that is not contaminated by the droplets of the electrolytic solution, thereby fusing the fusion allowance compared to the conventional case. The strength becomes high, and the possibility of causing a sealing failure can be reduced.
[0014]
The sealed battery of the present invention,in frontThe cross-sectional shape along the width direction of the welding allowance is substantially concave.Is preferred. Here, as the cross-sectional shape of the fusion allowance, for example, a concave arc surface, or a V-shaped surface in which a pair of flat surfaces intersect with each other via a concave arc surface on one surface or both surfaces in the thickness direction at the fusion allowance. Whether or not both surfaces in the thickness direction in the fusion allowance are symmetrical is arbitrary.
[0015]
In such a sealed battery, since the cross-sectional shape along the width direction of the fusion allowance is substantially concave, it is provided on the inner surface of the fusible resin layer or the liquid injection port constituting the sealed battery package. It can be confirmed from the outside that the film portion has flowed toward both ends in the width direction of the injection hole fusion margin while melting.
[0016]
Furthermore, the sealed battery of the present invention is,in frontThe cross-sectional shape along the width direction of the welding allowance is a tapered shape toward one end in the width direction.Is preferred. Here, the width direction one end portion is one of the width direction open end portion of the fusion allowance and the power generation element side end portion.
[0017]
In such a sealed battery, since the cross-sectional shape along the width direction of the fusion allowance is a tapered shape toward one end in the width direction, the fusible resin layer and the liquid injection port constituting the sealed battery package It can be confirmed from the outside that the film portion provided on the inner surface of the liquid flows toward the one end in the width direction of the injection hole fusion margin while melting.
[0020]
Next, the manufacturing method of the sealed battery according to the present invention includes a power generation element in which a positive electrode and a negative electrode are laminated via an electrolyte layer.It has a metal foil core and a fusible resin layerAfter being accommodated in the sealed battery package, the sealed battery packageFusible resin layerWhile fusing together to form a fusion allowance,Fusible resin layerA liquid injection port is formed without fusing each other, and then the power generation element is impregnated with the electrolytic solution from the liquid injection port, and then the liquid injection port is sandwiched in a thickness direction by a pair of molds and melted. It is premised on a manufacturing method of a sealed battery in which the power generation element is accommodated and sealed by a liquid injection hole fusion allowance for sealing.
[0021]
And the manufacturing method of the sealed battery of this invention is the said pair of metal mold | die in melt-sealing the said injection hole as described in Claim 4.Among these, a mold having a slope in which mold surfaces in one mold intersect with each other in a direction close to each otherThe melt-adhesive resin of the fusible resin layer constituting the sealed battery package is melted by being sandwiched between and flowing toward the end in the width direction of the injection hole fusion allowance, Further, as described in claim 5, a film portion made of a fusible resin is separately provided in at least one of a pair of regions corresponding to the inner surface of the liquid injection port in the sealed battery package in advance. In fusing and sealing the liquid injection port, the pair of moldsAmong them, a mold having a slope in which mold surfaces in one mold intersect with each other in a direction close to each otherThe film portion is caused to flow toward the end portion in the width direction of the liquid injection port fusion allowance while being melted.
[0022]
In the manufacturing method of such a sealed battery,A fusible resin layer constituting a sealed battery package orMembraneFusible resinThe inner surface of the liquid inlet is made to flow toward the end in the width direction of the liquid inlet fusion margin while meltingFusible resinEven if droplets of electrolyte adhere to the surface ofFusible resinAs the liquid melts, it flows toward the end in the width direction of the injection hole fusion allowance, so that the electrolytic solution is pushed away. Therefore, in such a sealed battery manufacturing method, at least a part of the inner surface of the injection port becomes an interface that is not contaminated by the droplets of the electrolyte, and the injection port is fusion sealed. In comparison, the fusion strength of the injection hole fusion allowance is increased, and the possibility of occurrence of poor sealing can be reduced.
[0023]
Further, the manufacturing method of the sealed battery of the present invention is as follows.And 7As described in the above, the thickness of the central portion in the width direction in the injection hole fusion margin is made to be one end in the width direction by projecting the central portion in at least one of the mold surfaces in advance. It is characterized by being made smaller than the thickness dimension of the part. Here, according to the present invention, the central portion of only one mold surface of the pair of molds may be protruded, or the central portions of both mold surfaces of each mold may be protruded. Further, when the central portion of the mold surface of each mold is projected, the mold surfaces do not have to have the same form, and may have different mold surfaces.
[0024]
In such a sealed battery manufacturing method, by adopting, for example, a convex arc surface or an inclined surface intersecting the sealing direction as the mold surface of the mold, the width in the injection hole fusion allowance is obtained. In order to make the thickness dimension of the central part in the direction smaller than the thickness dimension of one end part in the width direction,Fusible resinWill surely flow toward the width direction end of the injection hole fusion allowance.
[0025]
And in the manufacturing method of the sealed battery of the present invention, the claim8As described above, since the mold surface is a convex arcuate surface, the sealing force is applied to a specific portion of the injection hole fusion allowance as compared to the case where the mold surface is a slope intersecting with the sealing direction. Are less likely to concentrate, and this can reduce the possibility of damaging the injection hole fusion allowance.
[0026]
Further, the manufacturing method of the sealed battery according to the present invention is as follows.9 and 10As described above, when fusing and sealing the liquid injection port, one mold surface of each mold is brought into contact with only one axial end side of the liquid injection port, and then the outer surface of the liquid injection port The mold surface is moved toward the other end portion in the axial direction of the liquid injection port while maintaining the state in contact with the liquid injection port. In such a sealed battery manufacturing method, one mold is slidably moved or rolled, so that substantially the entire amount of the electrolytic solution can be eliminated, and both sides in the thickness direction at the injection hole fusion allowance are flat. And parallel to each other.
[0027]
Further, in the manufacturing method of the sealed battery of the present invention, the claim11 and 12In order to squeeze the fusible resin at the end in the width direction of the injection port fusion allowance, the splash of the electrolyte attached to the inner surface of the injection port is surely injected into the injection port fusion allowance. Will be discharged to the outside.
[0028]
Furthermore, in the manufacturing method of the sealed battery of the present invention,,in frontThe film portions are respectively provided in a pair of regions corresponding to the inner surface of the liquid injection port.PreferablyBy making these membrane parts flow in the same direction, it is possible to reliably remove electrolyte droplets from at least a part of the fusion interface at the injection port fusion allowance. Sealing performance can be obtained.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below in detail with reference to the drawings. In each embodiment described below, the members and the like already described in FIGS. 8 and 9 are denoted by the same or corresponding reference numerals in the drawings, and the description is simplified or omitted.
[0030]
As shown in FIG. 1, the sealed battery 10 according to the first embodiment of the present invention is formed into a substantially elliptical columnar shape by winding a positive electrode and a negative electrode laminated via a separator and then pressing in a radial direction. In order to prevent external leakage of the electrolyte layer and internal entry of outside air, the open end portions of the positive electrode terminal 82 and the negative electrode terminal 83 connected to the positive electrode and the negative electrode of the power generation element 81 are externally And a sealed battery package 14 for accommodating and sealing the power generation element 81 so as to be exposed.
[0031]
The metal resin composite film 15 constituting the sealed battery package 14 is composed of a metal foil core material made of aluminum foil, a polyester resin such as polyethylene terephthalate (PET) along the surface of the metal foil core material, a polyamide resin such as nylon, Alternatively, a protective layer made of a polyimide resin and a fusible resin layer made of polyolefin resin such as polypropylene (PP) or polyethylene (PE) along the back surface of the metal foil core material are laminated.
[0032]
The sealed battery 10 has a recess 16 corresponding to the shape of the power generation element 81 formed in one of the rectangular metal resin composite films 15 and 15, and the metal resin composite films 15 and 15 form the power generation element. 81 is sandwiched in the thickness direction, and then the four sides of each metal resin composite film 15 and 15 are heated and pressed in the thickness direction, thereby fusing the fusible resin layers together and having a predetermined width dimension. 17A, 17B, 17C, and 17D are formed, and after the injection port 18 is formed without fusing part of the fusion margin 17D that is the opposite side of the positive electrode terminal 82 and the negative electrode terminal 83, the injection port 18 After the electrolytic solution is gelled by impregnating the power generation element 81 with the electrolytic solution, the liquid injection port 18 is sealed with a pair of molds to form the liquid injection port fusion allowance 19.
[0033]
Here, the metal resin composite films 15 and 15 are provided with film portions 20 and 20 in the region for forming the fusion allowance 17D on the surface of the fusible resin layer according to the present invention (FIG. 1). Middle, see cross hatching).
The film parts 20 and 20 are made of acid-modified polypropylene made of the same material as the fusible resin layer, and are provided so that the film thickness dimension is 30 μm to 150 μm.
[0034]
These film portions 20 and 20 may be formed over the entire area of the fusion allowance 17D or may be formed only in a region corresponding to the inner surface of the liquid injection port 18. Furthermore, the film part 20 may be provided at least in a region corresponding to the inner surface of the liquid injection port 18 and may be provided only on one of the metal resin composite films 15 and 15.
These film portions 20, 20 may be provided by applying to the surface of the fusible resin layer, or may be provided by forming the film part separately and then sticking to the surface of the fusible resin layer. May be.
In addition, the melting points of these film portions 20 and 20 are preferably lower than the melting point of the fusible resin layer.
[0035]
As shown in FIG. 2, in this sealed battery 10, when the electrolytic solution 21 is impregnated into the power generation element 81 from the injection port 18, a film is formed on the inner surface of the injection port 18. It adheres to the surface of the parts 20 and 20 (see FIG. 2A).
Of the pair of molds 22 and 23 used for fusing and sealing the liquid injection port 18, the mold 22 has a flat mold surface 24 orthogonal to the sealing direction (vertical direction in the figure). Have. On the other hand, the mold surface 25 of the mold 23 is a convex arcuate surface having an axis perpendicular to the sealing direction, and its central portion protrudes.
[0036]
When these molds 22 and 23 come close to each other by a sealing device (not shown), the melted film parts 20 and 20 are brought into close contact with each other (see FIG. 2B), and then the film parts 20 and 20 are melted while being poured. By flowing substantially evenly from the widthwise center of the liquid inlet fusion allowance 19 toward both ends in the width direction, the cross-sectional shape along the width direction becomes concave, in other words, the liquid inlet fusion. The injection hole fusion allowance 19 is formed so that the thickness dimension T1 of the center portion in the width direction at the margin 19 is smaller than the thickness dimension T2 at one end portion in the width direction (see FIG. 2C).
In such an injection hole fusion allowance 19, the melted film portion 20 is squeezed out from one end in the width direction (right side in FIG. 2C) and the other end in the width direction (FIG. 2 ( C), the left side) is squeezed out to fill the gap 26 in the sealed battery package 14.
[0037]
According to the above-described sealed battery 10 of the first embodiment, since the thickness dimension T1 of the width direction central portion in the injection port fusion allowance 19 is smaller than the thickness dimension T2 of the width direction end portion, Even if droplets of electrolytic solution 21 adhere to the inner surface of 18, it flows toward both ends in the width direction of liquid inlet fusion allowance 19 so that the splashes of electrolytic solution 21 are pushed away while film portions 20 and 20 melt. As a result, the fusion strength of the injection hole fusion allowance 19 is increased as compared with the conventional case, and the possibility of occurrence of poor sealing can be reduced.
[0038]
In particular, according to the sealed battery 10, since the cross-sectional shape along the width direction of the liquid inlet fusion allowance 19 is substantially concave, the film portions 20 and 20 melt while the liquid inlet fusion allowance 19 It can be confirmed from the outside that the fluid has flowed toward both ends in the width direction, whereby a defective product in the manufacturing process can be reliably identified.
[0039]
Further, according to the sealed battery 10 described above, since the melted film part 20 is squeezed out from both ends in the width direction of the injection hole fusion allowance 19, the electrolytic solution 21 adhered to the surfaces of the film parts 20 and 20 Is discharged to the outside of the injection port fusion allowance 19. That is, the injection port fusion allowance 19 can be reliably sealed by fusing the fusible resin layers through a clean interface.
In particular, according to this sealed battery 10, since the film portion 20 squeezed from the end in the width direction of the injection hole fusion allowance 19 fills the gap 26 in the sealed battery package 14, In comparison, the impact resistance in the vicinity of the injection hole fusion allowance 19 is improved.
[0040]
Further, according to the first embodiment described above, since the mold 22 with the center portion of the mold surface 24 protruding is used in manufacturing the sealed battery, the center portion in the width direction in the injection hole fusion allowance 19 is used. The thickness dimension T1 can be easily made smaller than the thickness dimension T2 at one end in the width direction, whereby the liquid injection port 18 can be surely fused and sealed.
In particular, according to the first embodiment, since the mold surface 24 is a convex circular arc surface, compared with the case where the mold surface is a slope intersecting with the sealing direction, the injection port fusion allowance 19 It is difficult for the sealing force to concentrate on a specific portion of the liquid, and thus there is little possibility of damaging the injection hole fusion allowance 19.
[0041]
Further, according to such a manufacturing method of the sealed battery 10, since the film portions 20 and 20 are provided in the pair of regions corresponding to the inner surface of the liquid injection port 18, respectively, these film portions 20 and 20 are respectively provided. By making it flow in the same direction, it is possible to reliably remove splashes of the electrolyte 21 from at least a part of the fusion interface of the injection port fusion allowance 19, thereby providing a good sealing property for the injection port fusion allowance. can get.
[0042]
FIG. 3 shows a sealed battery 30 according to a second embodiment of the present invention. In each embodiment described below, the members and the like already described in FIGS. 1 and 2 are denoted by the same or corresponding reference numerals in the drawings, and the description is simplified or omitted.
[0043]
In the second embodiment shown in FIG. 3, a mold 33 for fusing and sealing the liquid injection port of the sealed battery 30 has a flat mold surface 35 that intersects the sealing direction. In this sealed battery 30, the film part 20 provided on the inner surface of the liquid inlet is squeezed outside only from one end in the width direction (right side in FIG. 3) of the liquid inlet fusion allowance 39. The cross-sectional shape along the width direction of the mouth fusion allowance 39 is tapered toward the power generation element 81.
In the second embodiment, the same effect as that of the first embodiment described above can be obtained.
[0044]
As shown in FIG. 4, in the third embodiment according to the present invention, the mold 43 for fusing and sealing the liquid injection port of the sealed battery 40 has a pair of flat surfaces intersecting via a concave arc surface. It has a V-shaped mold surface 45 arranged. In this sealed battery 40, the film part 20 provided on the inner surface of the injection port is squeezed out almost uniformly from both ends in the width direction of the injection port fusion allowance 39, The cross-sectional shape along the width direction is concave.
Also in the third embodiment, the same effects as those of the first embodiment and the second embodiment described above can be obtained.
[0045]
As shown in FIG. 5, in the fourth embodiment according to the present invention, the liquid injection port of the sealed battery 50 is fusion sealed using a pair of the molds 23 exemplified in the first embodiment described above. In this sealed battery 50, the membrane portion 20 provided on the inner surface of the liquid inlet is squeezed out almost uniformly from both ends in the width direction of the liquid inlet fusion allowance 59, The cross-sectional shape along the width direction is substantially drum-shaped.
In the fourth embodiment, the same effects as those in the first to third embodiments described above can be obtained.
[0046]
As shown in FIG. 6, in the fifth embodiment according to the present invention, the liquid injection port 68 of the sealed battery 60 includes the mold 23 exemplified in the first embodiment and the scraper-shaped mold 63. Used for fusion sealing. The mold 63 has a thickness dimension T3 smaller than the width dimension of the liquid inlet fusion allowance 69, and the mold surface 65 is a convex arc surface.
In the fifth embodiment, the molds 63 and 63 are used so that the mold surface 65 of the mold 63 contacts only one axial end side (the left side in FIG. 6) on the outer surface of the liquid injection port 68. The mold surface 65 is moved toward the other end in the axial direction of the liquid injection port 68 (to the right in FIG. 6) while holding the liquid injection port 68 and then in contact with the outer surface of the liquid injection port 68. Thus, the liquid injection port 68 is fused and sealed to form a liquid injection port fusion allowance 69.
Therefore, in the injection hole fusion allowance 69, the melted film portion 20 is squeezed from one end in the width direction, and both surfaces in the thickness direction are flat and parallel to each other.
[0047]
According to the fifth embodiment, in order to fuse and seal the liquid injection port 68, the mold surface 65 is fixed to the other end in the axial direction of the liquid injection port 68 while maintaining the state in contact with the outer surface of the liquid injection port 68. In order to squeeze out the membrane part 20 from one end in the width direction of the injection port fusion allowance 69 by moving toward the part, the electrolyte solution 21 adhering as a droplet to the inner surface of the injection port 68 is almost entirely In addition, the both sides in the thickness direction of the injection hole fusion allowance 69 can be made flat and parallel to each other.
Further, according to the fifth embodiment, by moving the mold surface 65 toward the other end in the axial direction of the liquid inlet 68, the film portion 20 is moved from one end in the width direction of the liquid inlet fusion allowance 69. In order to squeeze out, by appropriately selecting the movement dimension of the mold 63, it is possible to cope with other injection hole fusion allowances having different width dimensions.
[0048]
In addition, this invention is not limited to each embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible.
For example, in each of the above-described embodiments, a sealed battery having a sealed battery package constituted by a pair of rectangular metal resin composite films is illustrated, but the sealed battery 70 shown in FIG. Are also included in the present invention.
[0049]
That is, in the sealed battery package 74 of the sealed battery 70, a recess corresponding to the shape of the power generation element 81 is formed in the metal resin composite film 75 in advance, the metal resin composite film 75 is folded in half, and the power generation The element 81 is sandwiched in the thickness direction, the folds 75A of the metal resin composite film 75 are disposed along the opposite sides of the positive electrode terminal 82 and the negative electrode terminal 83, and then the thickness of the metal resin composite film 75 is heated while heating the three sides. By applying pressure in the direction, the fusible resin layers are fused to form the fusion allowances 77A, 77B, and 77C. Here, the metal resin composite film 75 is provided with the film portion 20 on the surface of the fusible resin layer corresponding to the fusion allowance 77C in advance.
[0050]
In the sealed battery 70, the power generation element 81 is impregnated with an electrolytic solution from a liquid injection port formed without fusing part of the fusion allowance 77C (see an arrow in FIG. 7), and then the present invention. The injection port is fused and sealed by an appropriate means based on the above, and the injection port fusion allowance is formed.
[0051]
In addition, the film portion does not need to have an integral thickness and a flat surface, and is thinned or thickened toward the end portion, or has a lattice-like slit or dimple on the surface. You may form.
In addition, materials such as power generation elements, sealed battery packages, fusion allowances, fusible resins, injection ports, injection port fusion allowances, membranes, molds, mold surfaces, etc., exemplified in the above-described embodiments The shape, size, form, number, location, thickness, etc. are arbitrary as long as the present invention can be achieved, and are not limited.
[0052]
In addition, the battery in which the electrolytic solution is gelled in the power generation element has been described. Needless to say, the present invention can be applied to a battery in which a general separator is used and the electrolytic solution is in a liquid state in the power generation element. Absent.
[0053]
【The invention's effect】
As described above, according to the sealed battery of the present invention, as described in claim 1, in at least a part of the fusion allowance formed in the sealed battery package.The fusible resin of the fusible resin layer constituting the sealed battery package is extracted from the end in the width direction.Therefore, one end part in the width direction of the fusion allowance or both end parts in the width direction while the fusible resin layer is melted so that the electrolytic solution adhering in the form of droplets is swept away on the inner surface of the injection hole formed temporarily As a result, the fusion strength of the fusion allowance is increased compared to the conventional case, which can reduce the possibility of sealing failure.It can be confirmed from the outside that the fusible resin has flowed toward the one end in the width direction of the injection hole fusion margin while melting..
[0054]
According to the sealed battery of the present invention, as described in claim 2,The fusible resin of the film portion made of the fusible resin provided on the inner surface of the sealed battery package is squeezed out from the end in the width direction in at least a part of the fusion allowance formed in the sealed battery package. For this reason, the meltable resin melts toward the one end in the width direction or both ends in the width direction so that the electrolytic solution adhering in the form of droplets is swept away from the inner surface of the temporarily formed liquid injection port. As a result, the fusion strength of the fusion allowance increases compared to the conventional case, and the possibility of poor sealing is reduced. It can be confirmed from the outside that it has flowed toward one end..
[0055]
Next, according to the method for manufacturing a sealed battery of the present invention, as described in claim 4, when fusing and sealing the liquid injection port, a pair of moldsAmong these, a mold having a slope in which mold surfaces in one mold intersect with each other in a direction close to each otherThe inner surface of the liquid inlet is made to flow toward the width direction end of the liquid inlet fusion margin while melting the fusible resin of the fusible resin layer constituting the sealed battery package. Even if droplets of the electrolytic solution adhere to the surface of the fusible resin layer provided on the liquid crystal, the fusible resin flows toward the end in the width direction of the injection port fusion allowance while melting, so that the electrolytic solution As a result, the fusion strength of the injection hole fusion allowance is increased as compared with the conventional case, and the possibility of occurrence of poor sealing can be reduced.
[0056]
In addition, according to the method for manufacturing a sealed battery of the present invention, as described in claim 5, it is fused in advance to at least one of a pair of regions corresponding to the inner surface of the liquid inlet in the sealed battery package. A pair of molds is used when the liquid injection port is fused and sealed by separately providing a film portion made of a functional resin.Among these, a mold having a slope in which mold surfaces in one mold intersect with each other in a direction close to each otherIn order to make it flow toward the end in the width direction of the injection hole fusion margin while melting the film part by sandwiching with, the droplets of the electrolyte adhere to the surface of the film part provided on the inner surface of the injection hole However, as the membrane melts, it flows toward the end in the width direction of the injection port fusion allowance, so that the electrolyte is washed away. This increases the possibility that a sealing failure may occur.
[0057]
Moreover, according to the manufacturing method of the sealed battery of this invention, Claim 6 is provided.And 7As described in the above, by projecting the central portion of at least one of the mold surfaces in advance, the thickness dimension of the central portion in the width direction in the injection port fusion allowance is set to one end in the width direction. In order to make it smaller than the thickness dimension, the fusion-bonding resin surely flows toward the width direction end of the injection hole fusion margin when the injection hole is fused and sealed.
[0058]
And according to the manufacturing method of the sealed battery of the present invention, the claim8As described above, since the mold surface is a convex circular arc surface, the sealing force is higher at a specific portion of the injection hole fusion allowance than when the mold surface is a slope intersecting with the seal direction. It is difficult to concentrate, thereby reducing the possibility of damaging the injection hole fusion allowance.
[0059]
Furthermore, according to the manufacturing method of the sealed battery of the present invention, the claim9 and 10As described in the above, when fusing and sealing the liquid inlet, one mold surface of each mold is brought into contact with only one axial end side of the liquid inlet, and then in contact with the outer surface of the liquid inlet In order to move the mold surface toward the other end in the axial direction of the liquid injection port while maintaining the same, it is possible to eliminate substantially the entire amount of the electrolyte, and to flatten both surfaces in the thickness direction at the injection port fusion allowance, Can be parallel to each other.
[0060]
Moreover, according to the manufacturing method of the sealed battery of the present invention, the claim11 and 12As described above, in order to squeeze the fusible resin at the widthwise end of the injection port fusion allowance, it is ensured that the droplets of the electrolyte adhering to the inner surface of the injection port are free from the injection port fusion allowance. It will be discharged to the outside. And according to the manufacturing method of the sealed battery of this invention, it is preferable to provide a film part in a pair of area | region corresponding to the inner surface of a liquid inlet, respectively, and these film parts are made to flow in the same direction, respectively. Thus, the splash of the electrolyte can be reliably removed from at least a part of the fusion interface at the injection port fusion allowance, and thereby good sealing performance can be obtained at the injection port fusion allowance.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing a first embodiment according to the present invention.
FIG. 2 is a partial enlarged cross-sectional view showing a main part of the first embodiment.
FIG. 3 is a partially enlarged cross-sectional view showing a main part of a second embodiment.
FIG. 4 is a partial enlarged cross-sectional view showing a main part of a third embodiment.
FIG. 5 is a partially enlarged cross-sectional view showing a main part of a fourth embodiment.
FIG. 6 is a partial enlarged cross-sectional view showing a main part of a fifth embodiment.
FIG. 7 is an overall perspective view showing a modification of the present invention.
FIG. 8 is an overall perspective view showing a conventional sealed battery.
FIG. 9 is a partially enlarged cross-sectional view showing a conventional injection hole fusion allowance.
[Explanation of symbols]
10, 30, 40, 50, 60, 70 Sealed battery
14 Package for sealed batteries
17A, 17B, 17C, 17D Fusion allowance
18 Injection port
19 Injection port fusion allowance
20 Membrane
21 Electrolyte
22, 23, 33, 43, 63 Mold
24, 25, 35, 45, 65 mold surface
81 Power generation elements
T1, T2 thickness dimensions

Claims (12)

A power generation element in which a positive electrode and a negative electrode are stacked via an electrolyte layer, and a sealed battery package that houses the power generation element,
The sealed battery package has a metal foil core material and a fusible resin layer,
A sealed battery in which the power generating element is housed and sealed by a fusion allowance for fusing the fusible resin layers of the sealed battery package to each other,
A sealed battery, wherein a fusible resin of a fusible resin layer constituting the sealed battery package is squeezed from an end in a width direction in at least a part of the fusion allowance. A power generation element in which a positive electrode and a negative electrode are stacked via an electrolyte layer, and a sealed battery package that houses the power generation element,
The sealed battery package has a metal foil core material and a fusible resin layer,
A sealed battery in which the power generating element is housed and sealed by a fusion allowance for fusing the fusible resin layers of the sealed battery package to each other,
A hermetic form in which the fusible resin of the film part made of the fusible resin provided on the inner surface of the sealed battery package is squeezed out from the end in the width direction in at least a part of the fusion allowance. battery. The sealed battery according to claim 2, wherein the melting point of the film part made of the fusible resin is lower than the melting point of the fusible resin layer constituting the sealed battery package. A power generating element in which a positive electrode and a negative electrode are laminated via an electrolyte layer is housed in a sealed battery package having a metal foil core and a fusible resin layer, and then the fusible resin of the sealed battery package The layers are fused with each other to form a fusion allowance and the meltable resin layers are not fused together to form a liquid injection port, and then the power generation element is impregnated with the electrolytic solution from the liquid injection port A method of manufacturing a sealed battery that encloses and seals the power generation element by a liquid injection fusion margin in which the liquid injection hole is sandwiched in a thickness direction by a pair of molds and is sealed.
When the liquid injection port is fused and sealed, the sealed battery is sandwiched between the pair of molds by a mold having inclined surfaces that intersect with each other in a direction in which the mold surfaces of the molds are close to each other. A process for producing a sealed battery, characterized in that the fusible resin of the fusible resin layer constituting the package for use is made to flow toward the widthwise end of the injection hole fusion allowance while melting. A power generating element in which a positive electrode and a negative electrode are laminated via an electrolyte layer is housed in a sealed battery package having a metal foil core and a fusible resin layer, and then the fusible resin of the sealed battery package The layers are fused with each other to form a fusion allowance and the meltable resin layers are not fused together to form a liquid injection port, and then the power generation element is impregnated with the electrolytic solution from the liquid injection port A method of manufacturing a sealed battery that encloses and seals the power generation element by a liquid injection fusion margin in which the liquid injection hole is sandwiched in a thickness direction by a pair of molds and is sealed.
A film portion made of a fusible resin is separately provided in at least one of a pair of regions corresponding to the inner surface of the liquid injection port in the sealed battery package in advance,
In fusing and sealing the liquid injection port, the film portion is sandwiched between molds having inclined surfaces that intersect with each other in a direction in which mold surfaces of one mold are close to each other. A manufacturing method of a sealed battery, wherein the liquid is made to flow toward an end in a width direction of the injection hole fusion margin while being melted. A power generating element in which a positive electrode and a negative electrode are laminated via an electrolyte layer is housed in a sealed battery package having a metal foil core and a fusible resin layer, and then the fusible resin of the sealed battery package The layers are fused with each other to form a fusion allowance and the meltable resin layers are not fused together to form a liquid injection port, and then the power generation element is impregnated with the electrolytic solution from the liquid injection port A method of manufacturing a sealed battery that encloses and seals the power generation element by a liquid injection fusion margin in which the liquid injection hole is sandwiched in a thickness direction by a pair of molds and is sealed.
When the liquid injection port is fused and sealed, the sealed battery package is sandwiched between the pair of molds by a mold having a center part of one mold projecting from the end part. A process for producing a hermetic battery, wherein the fusible resin of the fusible resin layer constituting the material is made to flow toward the end in the width direction of the injection hole fusing margin. A power generating element in which a positive electrode and a negative electrode are laminated via an electrolyte layer is housed in a sealed battery package having a metal foil core and a fusible resin layer, and then the fusible resin of the sealed battery package The layers are fused with each other to form a fusion allowance and the meltable resin layers are not fused together to form a liquid injection port, and then the power generation element is impregnated with the electrolytic solution from the liquid injection port A method of manufacturing a sealed battery that encloses and seals the power generation element by a liquid injection fusion margin in which the liquid injection hole is sandwiched in a thickness direction by a pair of molds and is sealed.
A film portion made of a fusible resin is separately provided in at least one of a pair of regions corresponding to the inner surface of the liquid injection port in the sealed battery package in advance,
When fusing and sealing the liquid injection port, the film part is melted by sandwiching the center part of the mold surface of one of the pair of molds with a mold protruding from the end part. However, it is made to flow toward the width direction edge part of the said injection hole fusion allowance, The manufacturing method of the sealed battery characterized by the above-mentioned. The method for manufacturing a sealed battery according to claim 6 or 7 , wherein the mold surface is a convex arc surface. A power generating element in which a positive electrode and a negative electrode are laminated via an electrolyte layer is housed in a sealed battery package having a metal foil core and a fusible resin layer, and then the fusible resin of the sealed battery package The layers are fused with each other to form a fusion allowance and the meltable resin layers are not fused together to form a liquid injection port, and then the power generation element is impregnated with the electrolytic solution from the liquid injection port A method of manufacturing a sealed battery that encloses and seals the power generation element by a liquid injection fusion margin in which the liquid injection hole is sandwiched in a thickness direction by a pair of molds and is sealed.
In fusing and sealing the liquid injection port, one surface of each mold was brought into contact only with one end side in the axial direction of the liquid injection port, and then the state in contact with the outer surface of the liquid injection port was maintained. tightly closed form method for producing a battery you and moving the mold surface toward the other axial end portion of the pouring hole remains. A power generating element in which a positive electrode and a negative electrode are laminated via an electrolyte layer is housed in a sealed battery package having a metal foil core and a fusible resin layer, and then the fusible resin of the sealed battery package The layers are fused with each other to form a fusion allowance and the meltable resin layers are not fused together to form a liquid injection port, and then the power generation element is impregnated with the electrolytic solution from the liquid injection port A method of manufacturing a sealed battery that encloses and seals the power generation element by a liquid injection fusion margin in which the liquid injection hole is sandwiched in a thickness direction by a pair of molds and is sealed.
A film portion made of a fusible resin is separately provided in at least one of a pair of regions corresponding to the inner surface of the liquid injection port in the sealed battery package in advance,
In fusing and sealing the liquid injection port, one surface of each mold was brought into contact only with one end side in the axial direction of the liquid injection port, and then the state in contact with the outer surface of the liquid injection port was maintained. tightly closed form method for producing a battery you and moving the mold surface toward the other axial end portion of the pouring hole remains. 10. The battery according to claim 4 , wherein the fusible resin of the fusible resin layer is squeezed out to an end in the width direction of the liquid inlet fusion allowance. Production method. The method for manufacturing a battery according to claim 5 , wherein the film part is squeezed out at an end in a width direction of the injection hole fusion allowance.

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