JP2001325992A - Manufacturing method of cell which uses laminate sheet as packaging case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a leakage of a welding surface to an ultimate extent by pouring an electrolyte simply and certainly, and moreover efficiently. SOLUTION: The manufacturing method of a cell consists of a molding process by which a recessed slot 10 which leads to a container 3 of a power generation component 2 in a welding surface 4 of a 1st laminate sheet 1A, a forming of an opening process which forms a through-hole 11 penetrating to the slot 10 on the welding surface 4 of a 2nd laminate sheet 1B, a welding process which carries out heat welding of the welding surface 4 of the 1st laminate sheet 1A and the 2nd laminate sheet 1B, without carrying out welding of the slot 10 to the welding surface 4 of the 2nd laminate sheet 1B by arranging the power generation component 2 between the 1st laminate sheet 1A and the 2nd laminate sheet 1B, an injection process which pours an electrolyte into the container 3 from the through-hole 11 and the slot 10, and a sealing process which carries out heat welding of the inside of the slot 10 to the welding surface 4 of the 2nd laminate sheet 1B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a battery in which a power generating element is disposed between laminate sheets and housed in an airtight manner, that is, a battery using the laminate sheet as an outer case.

[0002]

2. Description of the Related Art A battery using a laminate sheet as an outer case has the feature of being light and thin. A battery having this structure is manufactured by disposing a power generating element in which a positive electrode plate and a negative electrode plate are laminated between two layers of laminated sheets, and heat-sealing the laminated sheet on the outer periphery of the power generating element. A method of manufacturing a battery having this structure is described in, for example, Japanese Patent Application Laid-Open No. H11-224652.
JP, JP-A-10-270059, JP-A-10-270059
-270060 and the like.

[0003] The method described in Japanese Patent Application Laid-Open No. Hei 10-270060 is a unique method in which an electrolytic solution is supplied to a storage chamber between two layers of laminated sheets. The method described in this publication produces a battery by the following steps. (1) A power generating element is provided between two laminate sheets. (2) A pipe for injecting the electrolyte is provided on the welded surfaces of the two laminate sheets. (3) Two laminated sheets are thermally welded on the outer periphery of the power generating element. (4) Using a pipe, inject the electrolyte between the laminate sheets. (5) After pulling out the pipe, two laminate sheets are thermally welded on the welding surface.

[0004]

According to the method of manufacturing a battery in the above steps, an electrolyte can be efficiently injected into a laminate sheet accommodating a power generation element. However,
In this method, the pipe is accurately placed at a predetermined position of the two-layer laminate sheet, so that the step of inserting the pipe is complicated. In particular, since the battery is manufactured by an automatic assembling machine, a structure for assembling the pipe at an accurate position is complicated.

After the electrolyte is injected, the pipe is
Since the sheet is pulled out from between the laminated sheets of the layer, the inner surface of the laminated sheet may be rubbed and damaged at this time. The laminated sheet whose inner surface has been damaged may not be reliably welded in the subsequent heat welding step so that leakage does not occur. Poor welding of the laminate sheet causes the battery to be defective in the final assembling process, so that the economical harm in the manufacturing process becomes extremely large.

The present invention has been developed to solve this drawback. An important object of the present invention is to provide a method of manufacturing a battery using a laminate sheet as an outer case that can minimize leakage of a welding surface while injecting an electrolyte solution simply, reliably, and efficiently.

[0007]

According to the present invention, there is provided a method of manufacturing a battery using a laminate sheet as an outer case, comprising the steps of disposing a power generation element 2 between a first laminate sheet 1A and a second laminate sheet 1B; The sheet 1A and the second laminate sheet 1B are heat-welded on the welding surface 4 around the power generation element 2 to house the power generation element 2 inside the first laminate sheet 1A and the second laminate sheet 1B.

Further, in the method of manufacturing a battery according to the first aspect of the present invention, a forming step of providing a concave groove 10 communicating with the storage chamber 3 of the power generating element 2 on the welding surface 4 of the first laminate sheet 1A; A through-hole 11 communicating with the concave groove 10 of the first laminate sheet 1A is formed on the welding surface 4 of the laminate sheet 1B.
The power generating element 2 is disposed between the first laminate sheet 1A having the concave grooves 10 and the second laminate sheet 1B having the through-holes 11, and the concave grooves 10 are formed. A welding step of heat-welding the welding surface 4 of the first laminate sheet 1A and the second laminate sheet 1B without welding to the welding surface 4 of the laminate sheet 1B;
1 and an injection step of injecting the electrolytic solution from the concave groove 10 into the storage chamber 3, and a sealing step of thermally welding the inner surface of the concave groove 10 to the welding surface 4 of the second laminate sheet 1 </ b> B.

Further, in the method for manufacturing a battery according to the second aspect of the present invention, a forming step of providing a concave groove 10 communicating with the storage chamber 3 of the power generating element 2 on the welding surface 4 of the first laminate sheet 1A; The first laminated sheet 1A provided with 10
And the power generating element 2 is disposed between the second laminate sheet 1B and the first grooved sheet 1A and the second laminate sheet 1B without welding the concave groove 10 to the welding surface 4 of the second laminate sheet 1B. A welding step of heat-welding the welding surface 4; and a through-hole 1 communicating with the concave groove 10 of the first laminate sheet 1A on the welding surface 4 of the second laminate sheet 1B.
1, an injecting step of injecting the electrolytic solution from the through hole 11 and the concave groove 10 into the storage chamber 3, and a sealing step of heat-welding the inner surface of the concave groove 10 to the welding surface 4 of the second laminate sheet 1B. Consists of

In the method for producing a battery of the present invention, a sheet in which an aluminum foil and a thermoplastic resin sheet are laminated is preferably used for the first laminate sheet 1A and the second laminate sheet 1B.

Further, in the method of manufacturing a battery according to a fourth aspect of the present invention, there is provided a forming step of forming a concave groove 10 communicating with the storage chamber 3 of the power generating element 2 on the welding surface 4 of the first laminate sheet 1A; A through-hole 11 communicating with the concave groove 10 of the first laminate sheet 1A is formed on the welding surface 4 of the laminate sheet 1B.
The power generating element 2 is disposed between the first laminate sheet 1A having the concave grooves 10 and the second laminate sheet 1B having the through-holes 11, and the concave grooves 10 are formed. A welding step of heat-welding the welding surface 4 of the first laminate sheet 1A and the second laminate sheet 1B without welding to the welding surface 4 of the laminate sheet 1B;
1 and an injecting step of injecting the electrolytic solution into the storage chamber 3 from the concave groove 10, a sealing step of heat-welding the inner surface of the concave groove 10 to the welding surface 4 of the second laminate sheet 1B, and a first laminate sheet 1A and a second And a cutting step of cutting the welding surface 4 of the laminate sheet 1B inside the through hole 11.

Further, the method for manufacturing a battery according to claim 5 of the present invention includes a forming step of providing a concave groove 10 communicating with the storage chamber 3 of the power generating element 2 on the welding surface 4 of the first laminate sheet 1A; The first laminated sheet 1A provided with 10
And the power generating element 2 is disposed between the second laminate sheet 1B and the first grooved sheet 1A and the second laminate sheet 1B without welding the concave groove 10 to the welding surface 4 of the second laminate sheet 1B. A welding step of heat-welding the welding surface 4; and a through-hole 1 communicating with the concave groove 10 of the first laminate sheet 1A on the welding surface 4 of the second laminate sheet 1B.
1, an injecting step of injecting the electrolytic solution from the through hole 11 and the concave groove 10 into the storage chamber 3, and a sealing step of heat-welding the inner surface of the concave groove 10 to the welding surface 4 of the second laminate sheet 1B. And a cutting step of cutting the welding surface 4 of the first laminate sheet 1A and the second laminate sheet 1B inside the through hole 11.

[0013] The method for producing a battery of the present invention preferably comprises:
The first laminated sheet 1A is provided with a storage recess 9 for storing the power generation element 2, a recessed groove 10 is provided so as to communicate with the storage recess 9, and the power generation element 2 is inserted into the storage recess 9, and the first
The welding surface 4 of the planar second laminate sheet 1B is welded to the welding surface 4 of the laminate sheet 1A.

Further, the method for manufacturing a battery according to the present invention comprises:
A storage recess 9 for storing the power generation element 2 is provided in the laminate sheet 1A and the second laminate sheet 1B, and a concave groove 10 is provided in communication with the storage recess 9 of the first laminate sheet 1A.
The power generation element 2 can be put in the storage recess 9 and the welding surfaces 4 of the first laminate sheet 1A and the second laminate sheet 1B can be welded.

Further, the method of manufacturing a battery according to the present invention comprises the following steps:
Laminated sheet 1A and second laminated sheet 1B,
It can also be composed of one continuous laminate sheet. This manufacturing method includes the first laminated sheet 1A and the second laminated sheet 1A.
The laminate sheet 1B and the laminate sheet 1B are folded back so that the power generation element 2 is disposed between the first laminate sheet 1A and the second laminate sheet 1B.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate a battery manufacturing method for embodying the technical idea of the present invention, and the present invention does not specify the battery manufacturing method in the following method.

Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as "claims" and "claims". In the column of “means”. However, the members described in the claims are not limited to the members of the embodiments.

FIG. 1 is an exploded perspective view of a battery having a first laminate sheet 1A and a second laminate sheet 1B as an outer case 1, and a storage chamber between the first laminate sheet 1A and the second laminate sheet 1B. The power generation element 2 is housed in 3. The power generating element 2 has a structure in which a positive electrode plate and a negative electrode plate are laminated with a separator interposed therebetween.
4 are connected. The lead plate 14 is hermetically adhered to the welding surface 4 of the first laminate sheet 1A and the second laminate sheet 1B, and is drawn out.

The present invention is a method for manufacturing a battery using a laminate sheet as an outer case, but does not specify the type of battery to be manufactured. The battery is, for example, a secondary battery such as a lithium polymer secondary battery or a lithium ion secondary battery. The material of the power generation element and the components of the electrolyte differ depending on the type of battery. In the lithium polymer secondary battery, the positive electrode plate is made of lithium manganate or vanadium oxide, and the negative electrode plate is made of graphite-based carbon or a lithium alloy. In a lithium ion secondary battery, a positive electrode plate is made of lithium cobaltate or lithium nickelate, and a negative electrode plate is made of graphite-based carbon or coke-based carbon.

The power generating element 2 is manufactured by forming a stack of a positive electrode plate and a negative electrode plate via a separator into a spiral shape, and then pressing this into a planar shape. However, the power generation element
It can also be manufactured by laminating a plurality of positive electrode plates and negative electrode plates via a separator.

As shown in the enlarged cross-sectional view of FIG. 2, the first laminated sheet 1A and the second laminated sheet 1B have a heat-sealing film 6 bonded to a welding surface 4 on the inner side of a metal foil 5 such as an aluminum foil. Then, a protective film 7 for protecting the metal foil 5 is adhered to the surface side of the metal foil 5. The heat welding film 6 is a thermoplastic resin film that can be welded by heating, for example, a polyethylene film is used.
However, a polypropylene film or the like can be used as the thermoplastic resin film. Further, the thermoplastic resin film is bonded to the metal foil 5 in a single layer, or a plurality of different types of thermoplastic resin films are laminated and bonded to the metal foil.

As the protective film 7, any synthetic resin film capable of protecting the surface of the metal foil 5, for example, a PET film can be used. In the first laminated sheet 1A and the second laminated sheet 1B shown in FIG. 2, the protective film 7 is bonded to the metal layer with a urethane-based connecting member 8.

In the battery shown in FIG. 1, the storage recess 9 is provided only in the first laminate sheet 1A, and the second laminate sheet 1B has a planar shape. In this battery, since the second laminate sheet 1B has a planar shape, the forming process of the second laminate sheet 1B can be simplified. However, in the manufacturing method of the present invention, as shown in FIG. 3, the storage recess 9 can be provided in both the first laminate sheet 1A and the second laminate sheet 1B. In the battery of this structure, the storage recess 9 of the first laminate sheet 1A can be made shallow by storing a thick power generation element.

In the battery shown in FIGS. 1 and 3, two laminated sheets, a first laminated sheet 1A and a second laminated sheet 1B, are laminated, and a welding surface 4 is formed on four sides around the power generating element 2. The power generation element 2 is housed by welding and providing a storage room 3 therein. However, the manufacturing method of the present invention is the first method.
The laminate sheet and the second laminate sheet need not necessarily be two laminate sheets. As shown in FIGS. 4 and 5, with one continuous laminate sheet,
1st laminated sheet 1A and 2nd laminated sheet 1B
Can also be configured.

In the battery shown in FIGS. 4 and 5, one laminated sheet is divided into two regions in the middle to form a first laminated sheet 1A and a second laminated sheet 1B. This battery is folded back in a state of being stacked on each other at a boundary portion thereof, and the power generation element 2 is disposed between them. In this battery, the lower sheet in FIG.
The storage recess 9 is provided as A, and the upper sheet is the second laminate sheet 1B. In the battery having this structure, the first laminate sheet 1A is welded by welding three sides around the power generation element 2 without welding the folded portion of the laminate sheet.
And the power generation element 2 can be accommodated inside the second laminate sheet 1B. The battery having this structure has a feature that the outer shape can be reduced.

However, in a battery in which one laminate sheet is folded in the middle and a power generation element is stored therein, a storage recess may be provided in both the first laminate sheet and the second laminate sheet, or a storage recess may be provided in both. The storage chamber can be provided inside by welding the periphery in a bag shape without providing the storage chamber.

[0027]

[Embodiment 1] The battery shown in FIGS. 1 and 3 is manufactured by the following steps. [Step of Forming First Laminated Sheet] As shown in FIG. 1, a recessed groove 10 is formed on the welding surface 4 of the first laminated sheet 1A and communicates with the storage chamber 3 of the power generating element 2 and extends halfway along the outer peripheral edge. Is provided. The concave groove 10 does not extend to the outer peripheral edge of the welding surface 4. However, the concave groove may be provided to extend to the outer peripheral edge of the welding surface, and the inner surface of the concave groove may be welded to the outer peripheral edge of the welding surface in the step of welding the second laminate sheet to the first laminate sheet.

First laminated sheet 1 shown in FIGS. 1 and 3
A is formed by providing a storage recess 9 for storing the power generating element 2 and a concave groove 10 so as to communicate with the storage recess 9.
Is provided. After the first laminate sheet 1A is heated, it is vacuum-formed to form a storage recess 9 and a recessed groove 10 in a mold. Alternatively, the heated first laminate sheet 1A is sandwiched by a mold to form the storage recess 9 and the concave groove 10. The storage recess 9 is large enough to fit the power generation element 2,
That is, the power generating element 2 is formed into an inner shape that is slightly larger than the outer shape. In the battery of FIG. 1, the power generation element 2 is placed in the storage recess 9 of the first laminate sheet 1A, and the planar second laminate sheet 1B is welded. Accordingly, the first laminate sheet 1A of this battery forms the storage recess 9 having a depth substantially equal to the thickness of the power generation element 2.

The battery shown in FIG. 3 has a first laminate sheet 1A.
, And a storage recess 9 is provided in the second laminate sheet 1B. Therefore, the first laminate sheet 1A of this battery
Forms the storage recess 9 having a depth of about half the thickness of the power generating element.

A battery housing a thin power generating element can extend the inner peripheral portion of the welded surface when the outer welded surface is heat-welded without forming recesses in the first laminate sheet and the second laminate sheet. To provide a storage room inside. According to this manufacturing method, since there is no need to provide a storage recess in the first laminate sheet and the second laminate sheet, mass production can be performed more efficiently.

[Step of Opening Through Hole] A through hole 11 is provided on the welding surface 4 of the second laminate sheet 1B. Through hole 11
Is opened at a position communicating with the concave groove 10 of the first laminate sheet 1A. The through-hole 11 is opened by removing a part of the second laminate sheet 1B as shown in FIGS. 6 and 7, or is opened while leaving a part of the through-hole 11 as shown in FIG. . Through hole 11 which is open leaving a part
Has a feature that foreign substances can be prevented from entering.

[Welding Step of First Laminated Sheet and Second Laminated Sheet] The power generating element 2 is set between the first laminated sheet 1A provided with the concave grooves 10 and the second laminated sheet 1B provided with the through holes 11. Then, the welding surfaces 4 of the first laminate sheet 1A and the second laminate sheet 1B are thermally welded. As shown in the cross-sectional view of FIG. 9, the welding surfaces 4 of the first laminate sheet 1A and the second laminate sheet 1B press the outer surfaces of the first laminate sheet 1A and the second laminate sheet 1B with the pressurizing and heating tool 13. And heat welded. In this step, the pressing and heating tool 13 has a groove 13A for guiding the concave groove 10 on the pressing and heating surface so that the inner surface of the concave groove 10 is not welded to the welding surface 4 of the second laminate sheet 1B. Accordingly, as shown in FIGS. 6 to 8, the first laminated sheet 1A and the second laminated sheet 1B welded in this step are combined with the first laminated sheet 1A.
An injection path 12 is formed between the welding surface 4 and the welding surface 4 of the second laminate sheet 1B for injecting the electrolyte while communicating with the storage chamber 3. The injection path 12 is provided in the through hole 1 of the second laminate sheet 1B.
1 is open to the outside.

[Electrolyte Injection Step] The tip of an injection nozzle for inserting an electrolyte is inserted from the through hole 11 into the injection path 12, and the electrolyte is injected into the storage chamber 3 by the injection nozzle. The electrolyte can be injected more quickly by reducing the pressure inside the storage chamber 3.

[Sealing Step] After injecting the electrolytic solution, the first laminate sheet 1A and the second laminate sheet 1B are heated in a pressurized state by a pressurizing and heating tool, so that the inner surface of the concave groove 10 is formed in the second laminate sheet. Heat welding is performed on the welding surface 4 of 1B. In this state, the storage room 3 is hermetically sealed.

[Embodiment 2] In the manufacturing method of Embodiment 1 described above, the second laminate sheet 1B provided with the through holes 11 is heat-welded to the first laminate sheet 1A.
Can be opened after the first laminate sheet 1A and the second laminate sheet 1B are heat-sealed. This manufacturing method manufactures a battery as follows.

[Process of Forming First Laminated Sheet] Same as in Example 1.

[Welding Step of First Laminate Sheet and Second Laminate Sheet] Using the second laminate sheet 1B having no through hole, the first laminate sheet is formed in the same manner as in the first embodiment.
The welding surfaces 4 of the laminate sheet 1A and the second laminate sheet 1B are thermally welded. Also in this step, the concave grooves 10
Is not welded to the welding surface 4 of the second laminate sheet 1B. In the first laminated sheet 1A and the second laminated sheet 1B welded in this step, an injection path 12 communicating with the storage chamber 3 is formed between the welding surfaces 4 of the first laminated sheet 1A and the second laminated sheet 1B. However, since the injection path 12 does not have a through-hole opened in the second laminate sheet 1B, it is not communicated with the outside.

[Step of Opening Through Holes] The second laminate sheet 1B laminated on the first laminate sheet 1A is cut to provide through holes 11. The blade provided with the through-hole 11 can be used in the second lamination without cutting the first laminate sheet 1A.
Cut only the laminate sheet 1B. The through hole 11 is
The opening is provided at a position communicating with the concave groove 10 provided in the first laminate sheet 1A. As in the first embodiment, the through-hole 11 is also opened by removing a part of the second laminate sheet 1B as shown in FIG. 6, or as shown in FIG. Open, leaving the part.

Thereafter, a battery is manufactured in the same manner as in Example 1 except for the [injection step of electrolyte solution] and the [sealing step].

[Embodiment 3] The manufacturing method of the above embodiment is as follows.
Although the first laminate sheet and the second laminate sheet are two laminate sheets, the first laminate sheet and the second laminate sheet may be formed of one continuous laminate sheet as shown in FIG. . This manufacturing method manufactures a battery as follows.

[Step of Forming First Laminated Sheet] A single continuous laminated sheet is divided into two regions at the center, one region being a first laminated sheet 1A and the other being a second laminated sheet 1B. On the welding surface 4 of the first laminate sheet 1A, there is provided a concave groove 10 which communicates with the storage chamber 3 of the power generation element 2 and extends halfway along the outer peripheral edge.
The concave groove 10 does not extend to the outer peripheral edge of the welding surface 4. In the first laminated sheet 1A shown in the figure, a concave groove 10 is provided on the welding surface 4 located at a position facing a bent portion where the second laminated sheet is folded. However, the concave groove is the first
It can also be provided on the welding surface at a position adjacent to the bent portion of the laminate sheet and the second laminate sheet.

The laminate sheet shown in FIG. 4 has a recess 9 for accommodating the power generation element 2 formed in the first laminate sheet 1A on the half surface, and a concave groove 10 provided to communicate with the recess 9. The storage recess 9 and the recessed groove 10 are
The molding can be performed in the same manner as in the first embodiment. Although not shown, the battery may be provided with storage recesses in both the first laminate sheet and the second laminate sheet. Furthermore, the battery is formed by heat-welding the outer welding surfaces of the first laminate sheet and the second laminate, which are bent and laminated to each other, without forming a storage recess in the first laminate sheet and the second laminate sheet. It is also possible to provide a storage room in the room.

[Step of Opening Through Hole] Same as in the first embodiment.

[Welding Step of First Laminated Sheet and Second Laminated Sheet] As shown by the arrow in FIG. 4, one laminated sheet is folded at the boundary between the first laminated sheet 1A and the second laminated sheet 1B. Laminate.
At this time, the power generation element 2 is set between the first laminate sheet 1A and the second laminate sheet 1B. Welding surface 4 of first laminate sheet 1A and second laminate sheet 1B
Is heat-sealed. The two-folded laminated sheets are heat-welded to the welding surfaces 4 of the first laminated sheet 1A and the second laminated sheet 1B on the three sides excluding the bent portion around the power generating element. First laminate sheet 1
A and the welding surface 4 of the second laminate sheet 1B
It is thermally welded in the same manner as described above. In this step, the inner surface of the concave groove 10 is not welded to the welding surface 4 of the second laminate sheet 1B. As shown in FIG. 5, the first laminated sheet 1A and the second laminated sheet 1B welded in this step are communicated with the storage chamber 3 between the welding surfaces 4 of the first laminated sheet 1A and the second laminated sheet 1B. Injection channel 12 is formed. The injection path 12 is opened to the outside through the through hole 11 of the second laminate sheet 1B.

Thereafter, a battery is manufactured in the same manner as in Example 1 except that the [injection step of electrolyte solution] and the [sealing step] are performed.

In this embodiment, after forming a concave groove in the first laminate sheet and opening a through hole in the second laminate sheet, the first laminate sheet and the second laminate sheet are welded on the welding surface. However, the through holes provided in the second laminate sheet can be opened after the first laminate sheet and the second laminate sheet are welded, as in the second embodiment.

[Embodiment 4] As shown in FIG. 10, the battery manufactured in the above embodiment is the first laminate sheet 1A.
And the welding surface 4 of the second laminate sheet 1 </ b> B
It can also be cut inside.

[0048]

The method of manufacturing a battery according to the present invention has a feature that leakage of a welded surface can be minimized while injecting an electrolytic solution simply, reliably and efficiently. That is, in the battery manufacturing method of the present invention, the power generation element is housed inside by welding the welding surfaces of the first laminate sheet and the second laminate sheet, and the power generation element is attached to the welding surface of the first laminate sheet. A concave groove communicating with the storage chamber is provided, and a through hole communicating with the concave groove of the first laminate sheet is provided on the welding surface of the second laminate sheet, and the electrolytic solution is injected into the storage chamber from the through hole and the concave groove. This is because they are able to do so. The production method of the present invention is to heat weld the inner surfaces of the concave grooves provided in the first laminate sheet to the welding surfaces of the first and second laminate sheets without welding to the welding surface of the second laminate sheet. And an injection path for injecting the electrolyte. Therefore, unlike the conventional case, the electrolytic solution can be efficiently injected into the inside by simply assembling with an automatic assembling machine without disposing a pipe on the welding surface. This manufacturing method can eliminate the cost of the pipe and the step of inserting the pipe, thereby realizing the feature that the battery can be mass-produced at low cost.

Further, in the battery manufacturing method, after the electrolyte is injected, the inner surface of the concave groove is heat-welded to the welding surface of the second laminate sheet, so that the sealing can be performed very easily and securely. Therefore, unlike the conventional manufacturing method using a pipe, the welding surface is not damaged in the step of removing the pipe, and the leakage of the electrolytic solution and the like due to the damage can be eliminated. Therefore, the method for manufacturing a battery according to the present invention can realize an excellent feature capable of minimizing leakage at a welding surface and reducing occurrence of defective products.

Further, in the battery manufacturing method according to the fourth and fifth aspects of the present invention, the welding surface of the first laminate sheet and the second laminate sheet is cut inside the through-hole, so that the appearance is improved. The feature is that the external shape can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a battery manufactured by a manufacturing method according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a laminate sheet of the battery shown in FIG.

FIG. 3 is a perspective view of a battery according to another embodiment of the present invention.

FIG. 4 is an exploded perspective view of a battery manufactured by a manufacturing method according to another embodiment of the present invention.

5 is a vertical sectional view of the battery shown in FIG.

FIG. 6 is a vertical sectional view of a battery according to an embodiment of the present invention.

7 is a sectional view of the battery shown in FIG. 6 taken along the line AA.

FIG. 8 is a vertical sectional view of a battery according to another embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a welding step of the battery manufacturing method according to the embodiment of the present invention.

FIG. 10 is a perspective view showing a cutting step of a battery manufacturing method according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Outer case 1A ... 1st laminated sheet 1B ... 2nd laminated sheet 2 ... Power generation element 3 ... Storage room 4 ... Welding surface 5 ... Metal foil 6 ... Heat welding film 7 ... Protective film 8 ... Connection material 9 ... Storage recess 10 ... concave groove 11 ... through hole 12 ... injection path 13 ... pressurizing and heating tool 13A ... groove 14 ... lead plate

Claims (8)

[Claims] 1. A power generating element (2) is disposed between a first laminate sheet (1A) and a second laminate sheet (1B), and the first laminate sheet (1A) and the second laminate sheet (1B) are The heat-welding is performed on the welding surface (4) around the power generation element (2), and the laminate sheet for storing the power generation element (2) inside the first laminate sheet (1A) and the second laminate sheet (1B) is provided as an outer case. In the method for manufacturing a battery, a power generation element (2)
Forming a concave groove (10) communicating with the storage chamber (3) of the first laminate sheet; communicating with the concave groove (10) of the first laminate sheet (1A) on the welding surface (4) of the second laminate sheet (1B) An opening step of providing a through hole (11) to be formed; a first laminate sheet (1A) having a concave groove (10);
The power generating element (2) is disposed between the second laminate sheets (1B) having the through holes (11), and the concave grooves (10) are formed on the welding surface (4) of the second laminate sheet (1B). A welding step of heat-welding the welding surfaces (4) of the first laminate sheet (1A) and the second laminate sheet (1B) without welding; and a storage chamber (3) through the through-hole (11) and the concave groove (10). )), And a sealing step of heat-welding the inner surface of the concave groove (10) to the welding surface (4) of the second laminate sheet (1B). Production method. 2. A power generating element (2) is provided between a first laminate sheet (1A) and a second laminate sheet (1B), and the first laminate sheet (1A) and the second laminate sheet (1B) are The heat-welding is performed on the welding surface (4) around the power generation element (2), and the laminate sheet for storing the power generation element (2) inside the first laminate sheet (1A) and the second laminate sheet (1B) is provided as an outer case. In the method for manufacturing a battery, a power generation element (2)
Forming a concave groove (10) communicating with the storage chamber (3) of the first laminate sheet (1A) having the concave groove (10);
The power generating element (2) is disposed between the second laminate sheets (1B), and the concave grooves (10) are formed on the welding surface of the second laminate sheet (1B).
A welding step of heat-welding the welding surface (4) of the first laminate sheet (1A) and the second laminate sheet (1B) without welding to the welding surface (4) of the second laminate sheet (1B). ), An opening step of providing a through hole (11) communicating with the concave groove (10) of the first laminate sheet (1A), and electrolysis from the through hole (11) and the concave groove (10) to the storage chamber (3). A method of manufacturing a battery using a laminate sheet as an outer case, comprising: an injection step of injecting a liquid; and a sealing step of heat-welding the inner surface of the concave groove (10) to the welding surface (4) of the second laminate sheet (1B). 3. The laminate sheet according to claim 1, wherein a sheet obtained by laminating an aluminum foil and a thermoplastic resin sheet is used for the first laminate sheet (1A) and the second laminate sheet (1B). A method for manufacturing a battery to be used as an outer case. 4. A power generation element (2) is provided between a first laminate sheet (1A) and a second laminate sheet (1B), and the first laminate sheet (1A) and the second laminate sheet (1B) are provided. The heat-welding is performed on the welding surface (4) around the power generation element (2), and the laminate sheet for storing the power generation element (2) inside the first laminate sheet (1A) and the second laminate sheet (1B) is provided as an outer case. In the method for manufacturing a battery, a power generation element (2)
Forming a concave groove (10) communicating with the storage chamber (3) of the first laminate sheet; communicating with the concave groove (10) of the first laminate sheet (1A) on the welding surface (4) of the second laminate sheet (1B) An opening step of providing a through hole (11) to be formed; a first laminate sheet (1A) having a concave groove (10);
The power generating element (2) is disposed between the second laminate sheets (1B) having the through holes (11), and the concave grooves (10) are formed on the welding surface (4) of the second laminate sheet (1B). A welding step of heat-welding the welding surfaces (4) of the first laminate sheet (1A) and the second laminate sheet (1B) without welding; and a storage chamber (3) through the through-hole (11) and the concave groove (10). ), A sealing step of thermally welding the inner surface of the concave groove (10) to the welding surface (4) of the second laminate sheet (1B), and a sealing step of welding the first laminate sheet (1A) to the second laminate sheet (1A). Laminated sheet (1B)
And a cutting step of cutting the welded surface (4) inside the through hole (11). 5. A power generating element (2) is provided between a first laminate sheet (1A) and a second laminate sheet (1B), and the first laminate sheet (1A) and the second laminate sheet (1B) are The heat-welding is performed on the welding surface (4) around the power generation element (2), and the laminate sheet for storing the power generation element (2) inside the first laminate sheet (1A) and the second laminate sheet (1B) is provided as an outer case. In the method for manufacturing a battery, a power generation element (2)
Forming a concave groove (10) communicating with the storage chamber (3) of the first laminate sheet (1A) having the concave groove (10);
The power generating element (2) is disposed between the second laminate sheets (1B), and the concave grooves (10) are formed on the welding surface of the second laminate sheet (1B).
A welding step of heat-welding the welding surface (4) of the first laminate sheet (1A) and the second laminate sheet (1B) without welding to the welding surface (4) of the second laminate sheet (1B). ), An opening step of providing a through hole (11) communicating with the concave groove (10) of the first laminate sheet (1A), and electrolysis from the through hole (11) and the concave groove (10) to the storage chamber (3). An injection step of injecting a liquid, a sealing step of heat-welding the inner surface of the concave groove (10) to the welding surface (4) of the second laminate sheet (1B), and a first laminate sheet (1A) and a second laminate sheet ( 1B)
And a cutting step of cutting the welded surface (4) inside the through hole (11). 6. A power generation element is provided on the first laminate sheet (1A).
A storage recess (9) for storing (2) is provided, and the storage recess (9) is provided.
A concave groove (10) is provided so as to communicate with the first laminated sheet (1A), and a power generating element (2) is inserted into the storage concave part (9). 1B) welding surface (4)
A method for producing a battery, comprising using the laminate sheet according to any one of claims 1, 2, 4, and 5 as an outer case. 7. The first laminated sheet (1A) and the second laminated sheet (1B) are provided with a storage recess (9) for storing the power generating element (2), and the storage recess (9) of the first laminate sheet (1A) is provided. And a power generating element (2) is inserted into the storage recess (9), and the welding surfaces (4) of the first laminate sheet (1A) and the second laminate sheet (1B) are welded. A method for producing a battery, comprising using the laminate sheet according to any one of claims 1, 2, 4, and 5 as an outer case. 8. The first laminate sheet (1A) and the second laminate sheet (1B) are constituted by one continuous laminate sheet, and the first laminate sheet (1A) and the second laminate sheet (1B) The power generation element (2) is disposed between the first laminate sheet (1A) and the second laminate sheet (1B) by folding back the first laminate sheet (1A) and the second laminate sheet (1B).
A method for producing a battery using the laminate sheet described in any one of the above as an outer case.