JPH10247480A - Molded battery and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery capable of improving heat resistance, eliminating the complexity of the process without decreasing the volumetric efficiency of the battery, having a simplified process, and allowing a user to judge polarities at a glance by enveloping an electrode group laminated with a positive electrode, a separator, and a negative electrode with a mold resin. SOLUTION: An electrode group 10 laminated with a positive electrode 2, a separator 3, and a negative electrode 4 is enveloped with a mold resin 1 to form this battery, and it is provided with a positive electrode terminal 6 connected to the positive electrode 2 and a negative electrode terminal 7 connected to the negative electrode 4. A reaction curing resin such as an epoxy resin excellent in heat resistance or a thermoplastic resin such as polycarbonate, an AS resin, or polypropylene is used for the mold resin 1. The positive electrode 2 is mainly made of lithium colaltate, the separator 3 is constituted of a solid electrolyte mainly made of polyether and lithium salt, and the negative electrode 4 is mainly made of carbon, respectively. When different colors are arranged for the positive electrode 2 and negative electrode 4 side, their polarities can be judged at a glance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded battery and a method of manufacturing the same, and more specifically, to obtain a molded battery capable of increasing discharge capacity and improving hermeticity, and its manufacture. The present invention relates to a manufacturing method capable of improving productivity.

[0002]

2. Description of the Related Art In a portable electronic device, a small battery is sometimes mounted on a printed circuit board as a memory backup, and a small battery for such an application is required to have high hermeticity. Since a shape that can improve productivity and high reliability that can withstand heat during soldering are required, a molded battery in which the electrode group consisting of the positive electrode, the separator, and the negative electrode is wrapped with a mold resin is often used. In many cases, a molded battery having excellent hermeticity and heat resistance, in which the electrode group is sealed in a metal container and then encapsulated with a mold resin, is used.

In the above-described molded battery, a group of electrodes consisting of a positive electrode, a separator and a negative electrode is inserted into a metal container, an electrolytic solution is injected, a positive electrode terminal and a negative electrode terminal are attached, and the metal container is sealed. It is encapsulated in.

[0004]

The above-mentioned conventional molded battery has excellent sealing and heat resistance because the electrode group is sealed in a metal container, but has a high volume ratio occupied by the metal container. The problem that the volumetric efficiency of the battery decreases,
There is a problem that the metal container causes an increase in cost, and there is a problem that the process is complicated because two steps of a step of enclosing the electrode group in the metal container and a step of encapsulating the electrode group with a mold resin are required.

Further, in the above-mentioned conventional molded battery, the polarity is indicated on the mold resin enclosing the metal container enclosing the electrode group, but it is difficult to judge the polarity at a glance. was there.

[0006]

According to the first aspect of the present invention, heat resistance can be improved with a mold resin, and the electrode group is not sealed in a metal container. Thereby, a decrease in the volumetric efficiency of the battery can be prevented.

According to the second aspect of the present invention, the heat resistance can be improved by the mold resin.
With the moisture-impermeable layer, the sealing property, particularly the moisture resistance, can be improved, and the volume efficiency of the battery can be prevented from being reduced by not enclosing the electrode group in a metal container.

According to the third and fourth aspects of the present invention, the polarity of the battery can be determined at a glance.

According to the fifth and sixth aspects of the present invention, it is possible to simplify the process of manufacturing the pole group covered with the mold resin.

[0010] Further, according to the invention of claim 7, it is possible to simplify the process of manufacturing a molded battery excellent in hermeticity, particularly excellent in moisture resistance.

According to the method for manufacturing a molded battery according to the eighth and ninth aspects, a battery whose polarity can be determined at a glance can be manufactured in a simplified process.

[0012] According to the method for manufacturing a molded battery according to the tenth aspect, the production of the molded battery in which the electrode group wrapped with the mold resin is wrapped with the film having the moisture-impermeable layer is performed in one step. And the process can be simplified.

[0013] According to the method for manufacturing a molded battery according to the eleventh aspect, the step of encapsulating the molded battery with the first and second resin molded bodies can be simplified.

According to the method of manufacturing a molded battery according to the twelfth and thirteenth aspects, a battery whose polarity can be determined at a glance can be manufactured in a simplified process.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on its embodiments.

FIG. 1 is a sectional view of a molded battery according to an embodiment of the present invention.

The feature of the molded battery shown in FIG. 1 is that the electrode group 10 in which the positive electrode 2, the separator 3 and the negative electrode 4 are laminated is covered with the mold resin 1, and the positive electrode terminal 6 and the negative electrode 4 connected to the positive electrode 2. That is, the connected negative electrode terminal 7 is provided.

The mold resin 1 is preferably a reaction curable resin such as an epoxy resin having excellent heat resistance, or a thermoplastic resin such as polycarbonate, AS resin, ABS resin, polypropylene, polystyrene, polyamide, polysulfone, and polyethersulfone. .

The positive electrode 2 of the above-mentioned molded battery is composed mainly of lithium cobalt oxide, the separator 3 is composed of a solid electrolyte composed mainly of polyether and lithium salt, and the negative electrode 4 is composed mainly of carbon. What is used as a component is often used.

If the mold resin 1 has different colors or designs on the positive electrode 2 side and the negative electrode 4 side, the polarity of the battery can be determined at a glance. It should be noted that providing different colors or designs on the positive electrode 2 side and the negative electrode 4 side can be achieved by applying different colors or designs on the positive electrode terminal 6 side and the negative electrode terminal 7 side, or applying different colors or designs on a part of each. Applying is also included.

2 and 3 are views for explaining a method of manufacturing a molded battery according to the embodiment of the present invention.

The method of manufacturing the molded battery shown in FIG. 2 is characterized in that a positive electrode 2, a separator 3 and a negative electrode 4 are laminated, and a set of dies 101 having recesses in which the positive electrode group 10 can be accommodated. And the molds 101 and 1 are prepared.
02, the electrode group 10 is accommodated in the concave portion, and the reaction-curable resin before curing is passed through the injection port 8 and the gate 9 into the gap 20 between the accommodated electrode group and the inner wall of the concave portion of the mold 101, 102 by gravity or low pressure. Injecting or melting thermoplastic resin is injected, cooled and solidified to form the mold resin 1.

The method of manufacturing the molded battery shown in FIG. 3 is characterized in that a positive electrode 2, a separator 3 and a negative electrode 4 are laminated, and a first electrode group 10 on which the positive electrode 2 side or the negative electrode 4 side of the positive electrode group 10 can be accommodated. A resin molded body 11 is prepared, and the electrode group 1 is prepared.
After the first resin molded body 11 containing the electrode group 10 is accommodated in the first resin molded body 11, the first resin molded body 11 containing the pole group 10 is disposed in the mold 103, and the gap between the pole group 10 and the mold 104 is set. The reaction curable resin or the thermoplastic resin is injected into the space through the injection port 8 and the gate 9 as described above, and the second resin molded body 1 is formed.
2 and the pole group 10 is divided into first and second resin molded bodies 11,
12 is to be encapsulated with the mold resin 1.

According to each of the manufacturing methods described above, the step of enclosing the electrode group 10 with the mold resin 1 can be simplified, and if a part of the mold resin 1 has a different coloration or design. At a glance, the polarity of the battery can be determined.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

FIGS. 4 and 5 are sectional views of a molded battery according to another embodiment of the present invention.

The feature of the molded battery shown in FIG. 4 is that the electrode group 10 in which the positive electrode 2, the separator 3 and the negative electrode 4 are laminated is covered with the mold resin 1, and the positive electrode terminal 6 and the negative electrode 4 connected to the positive electrode 2. The pole group 10 provided with the connected negative electrode terminal 7 and wrapped with the mold resin 1 has a structure in which a moisture-impermeable layer 51 is provided on the inner surface and a laminate film 5 having a resin layer 52 on the outer surface.

The feature of the molded battery shown in FIG. 5 is that the electrode group 10 in which the positive electrode 2, the separator 3, and the negative electrode 4 are laminated
The impermeable layer 51 on the inner surface is covered with the laminated film 5 having the resin layer 52 on the outer surface, and the electrode group 10 covered with the laminated film 5 is covered with the mold resin 1.

In each of the above embodiments, the moisture-impermeable layer 51 on the inner surface of the laminated film 5 has a thickness of 20 to
A metal foil such as aluminum having a thickness of 50 μm is preferable, and the resin layer 52 on the outer surface is preferably a synthetic resin having a thickness of several μm such as polypropylene or polyethylene.

Further, instead of the laminate film 5, an in-mold label in which polypropylene or polyethylene as the resin layer 52 and aluminum or silica as the moisture-impermeable layer 51 are vapor-deposited can be used.

If the laminate film 5 and the resin layer 52 on the outer surface of the in-mold label have different colors or designs on the positive electrode 2 side and the negative electrode 4 side, the polarity of the battery can be determined at a glance. In addition, the positive electrode 2 side and the negative electrode 4
Applying different colors or designs on the side includes applying different colors or designs on the positive electrode terminal 6 side and the negative electrode terminal 7 side, or applying different colors or designs on a part of each.

The method of manufacturing the molded battery shown in FIG. 6 is characterized in that a positive electrode 2, a separator 3 and a negative electrode 4 are laminated, and a set of dies 101 having recesses in which the positive electrode group 10 can be accommodated. 102, a moisture-impermeable layer 51 and a resin layer 52
And a laminate film 5 having
The resin layer 52 of the laminate film 5 is provided in the recesses 01 and 102 so as to be in contact with the inner wall.
The electrode group 10 is housed in the concave portions of the molds 101 and 102, and the reaction hardening is performed as described above through the gap 20 between the housed electrode group 10 and the laminate film 5 provided in the molds 101 and 102 through the injection port 8 and the gate 9. Inject resin and thermoplastic resin, cool,
It is to be solidified to form a mold resin.

The method of manufacturing the molded battery shown in FIG. 7 is characterized in that the electrode group 10 in which the positive electrode 2, the separator 3 and the negative electrode 4 are laminated, and the first group in which the positive electrode 2 side or the negative electrode 4 side of the electrode group 10 can be accommodated. After preparing a resin molded body 11 and a laminate film 5 having a moisture-impermeable layer 51 and a resin layer 52, and storing the electrode group 10 in the first resin molded body 11,
The first resin molded body 11 accommodating the electrode group 10 is placed on a mold 103 provided such that the resin layer 52 of the laminate film 5 is in contact with the inner wall, and the resin layer 52 of the laminate film 5 is placed on the inner wall. The mold 104 provided so as to be in contact with the mold is arranged, and the reaction curable resin or the thermoplastic resin is injected into the space between the electrode group 10 and the mold 104 through the injection port 8 and the gate 9 as described above, and cooled. , Solidified second
Is formed, and the electrode group 10 is covered with a mold resin composed of the first and second resin molded bodies 11 and 12, and the electrode group 10 covered with the mold resin is impermeable to the inner surface. That is, the wet layer 51 is covered with the laminate film 5 having the resin layer 52 on the outer surface.

In each of the above embodiments, the moisture-impermeable layer 51 on the inner surface of the laminate film 5 has a thickness of 20 to 50 μm.
m of a metal foil such as aluminum, and the resin layer 52 on the outer surface of the laminate film 5 is made of a synthetic resin such as polyethylene having a thickness of several μm. , 104 so as to be in contact with the inner wall of the recess.

In place of the laminate film 5, an in-mold label in which polypropylene or polyethylene as the resin layer 52 and aluminum or silica as the moisture-impermeable layer 51 are vapor-deposited can also be used.

If the laminate film 5 and the resin layer 52 on the outer surface of the in-mold label have different colors or designs on the positive electrode 2 side and the negative electrode 4 side, the polarity of the battery can be determined at a glance. In addition, the positive electrode 2 side and the negative electrode 4
Applying different colors or designs on the side includes applying different colors or designs on the positive electrode terminal 6 side and the negative electrode terminal 7 side, or applying different colors or designs on a part of each.

In each of the above embodiments, the pole group covered with the mold resin 1 is covered with the laminate film 5, but the pole group is covered with the laminate film 5 and then covered with the mold resin. In this case, the mold 101,
Needless to say, it is not necessary to provide the laminate film 5 on the inner walls of the concave portions 102, 103 and 104.

[0038]

As described above, in the molded battery of the present invention, the electrode group is covered with the molding resin, so that the volume efficiency of the battery can be improved, and a part of the battery has a moisture-impermeable layer. Thereby, the sealing performance can be improved. Further, the method for manufacturing a molded battery according to the present invention can simplify the manufacturing process.

[Brief description of the drawings]

FIG. 1 is a sectional view of a molded battery of the present invention.

FIG. 2 is a diagram for explaining a method of manufacturing a molded battery according to the present invention.

FIG. 3 is a view for explaining a method of manufacturing a molded battery according to the present invention.

FIG. 4 is a cross-sectional view according to another embodiment of the molded battery of the present invention.

FIG. 5 is a cross-sectional view according to another embodiment of the molded battery of the present invention.

FIG. 6 is a view for explaining another method for manufacturing the molded battery of the present invention.

FIG. 7 is a view for explaining another method for manufacturing the molded battery of the present invention.

[Explanation of symbols]

 Reference Signs List 1 mold resin 10 electrode group 11 first resin molded body 12 second resin molded body 2 positive electrode 3 separator 4 negative electrode 5 laminated film 51 non-permeable layer 52 resin layer 101 to 104 mold

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[Procedure amendment]

[Submission date] March 3, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Claims (13)

[Claims] 1. A molded battery in which a group of electrodes in which a positive electrode, a separator, and a negative electrode are laminated are encapsulated with a mold resin. 2. The molded battery according to claim 1, wherein
A molded battery, wherein the encapsulation of the electrode group includes a moisture-impermeable layer. 3. The molded battery according to claim 1, wherein a different color scheme or design is applied to a part of the molded resin. 4. The molded battery according to claim 3, wherein
A molded battery, wherein the mold resin has different colors or designs on the positive electrode side and the negative electrode side. 5. An electrode group in which a positive electrode, a separator, and a negative electrode are stacked, and a set of molds having a concave portion capable of accommodating the electrode group are prepared, and the electrode group is accommodated in the concave portion of the mold. Molding resin is injected into the gap between the electrode group and the inner wall of the concave portion of the mold. 6. An electrode group in which a positive electrode, a separator, and a negative electrode are laminated, and a first resin molded body containing a part of the electrode group are prepared, and a first resin containing a part of the electrode group is provided. The molded body is arranged in a mold, and a second resin molded body is formed in a space in the mold, and the electrode group is covered with a mold resin composed of the first and second resin molded bodies. Manufacturing method of a molded battery. 7. The method for producing a molded battery according to claim 5, further comprising a step of encapsulating the electrode group in which the positive electrode, the separator, and the negative electrode are laminated with a film that forms a moisture-impermeable layer. Method of manufacturing a molded battery. 8. A method for manufacturing a molded battery according to claim 5, comprising a step of applying a different color scheme or design to a part of the molded resin. 9. The method for manufacturing a molded battery according to claim 8, further comprising a step of making the positive electrode side and the negative electrode side of the mold resin have different colors or designs. 10. The method for manufacturing a molded battery according to claim 6, wherein a film having a moisture-impermeable layer is prepared, and the film is provided on an inner wall of a concave portion of the mold, and the electrode is provided in a concave portion of the mold. A method for manufacturing a molded battery, comprising housing a group and injecting a mold resin into a gap between the housed electrode group and a film provided in a mold. 11. A method for manufacturing a molded battery according to claim 6, wherein a film having a moisture-impermeable layer is prepared, and the film is provided on the inner wall of the concave portion of the mold, and a part of the electrode group is accommodated. Placing the first resin molded body in a mold,
An electrode group in which a space data and a negative electrode in a mold are laminated, and a second resin molded body is formed on a first resin molded body accommodating a part of the electrode group to form first and second electrode groups. A method for producing a molded battery, characterized by encapsulating the molded battery with a molding resin made of the resin molded body. 12. The method for manufacturing a molded battery according to claim 10, further comprising a step of applying a different coloration or design to a part of the film. 13. The method for manufacturing a molded battery according to claim 12, further comprising a step of causing the film to have different colors or designs on the positive electrode side and the negative electrode side.