JP3364273B2 - Stacked battery and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated battery manufactured by a thick film forming method and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventional batteries generally have a structure in which a positive electrode and a negative electrode form separate blocks and face each other via a separator containing an electrolyte. However, the battery is lightweight and has high energy consumption. In order to increase the density and the like, like a lithium battery, a positive electrode material, a positive electrode current collector, a positive electrode material, a separator containing an electrolyte, a negative electrode material, a negative electrode current collector, each sheet of the negative electrode material are stacked and spirally wound, There is a structure in which the spirally wound battery element body is housed in a cylindrical case, and the upper surface of the case serves as a positive electrode terminal and the lower surface of the case serves as a negative electrode terminal. However, according to this structure, since the battery shape is limited to the conventional cylindrical shape, there is a problem that space efficiency is poor and an occupied space becomes large when mounting on a substrate or the like.

On the other hand, as described in JP-A-2-291671, in order to make the battery thinner and more flexible, a negative electrode, an electrolyte, a positive electrode, and a current collector are formed in a laminated structure, and a sheet-like flexible structure is formed. There is a battery. However, the side surface of the battery formed into a sheet is open.
Since the solid electrolyte has a blunt shape and the solid electrolyte has to be used, and the conductivity of the solid electrolyte is low, there is a problem that the current value that can be taken out is small.

The present invention has been made in view of the above problems of the prior art.
It is an object of the present invention to provide a laminated battery having a structure that can be made smaller and thinner by a film forming technique, can obtain a large current value, and has no fear of electrolyte leakage, and a method for manufacturing the same.

[0005]

In order to achieve the above object, the laminated battery of the present invention forms a laminated body composed of a positive electrode, an insulating material and a negative electrode by a film forming technique, and the insulating material is omitted. A separator, the separator is filled with an electrolytic solution in the cutout portion, and the separator built-in portion is hermetically sealed.

Further, in the manufacturing method of the present invention, a hexahedron laminate composed of a positive electrode, a negative electrode and an insulating material between the positive electrode and the negative electrode is formed by a thick film forming method, and each of the positive electrode and the negative electrode has a part thereof. A hole penetrating from the upper surface to the lower surface is formed, a current collector is formed on the inner wall surface of the hole, and a hole penetrating from the upper surface to the lower surface is formed in a part of the insulating material so that the positive electrode and the negative electrode face each other. The insulating material cutout portion is formed, a separator filled with an electrolytic solution is built in the insulating material cutout portion, and the upper and lower surfaces of the separator built-in portion are sealed with an insulating material lid.

[0007]

As described above, the laminated battery of the present invention forms a laminated body composed of the positive electrode, the insulating material and the negative electrode by the film forming technique, and the electrolytic solution is used as an electrolyte between the facing surfaces of the positive electrode and the negative electrode. Since the separator filled with is built in, the current value that can be taken out becomes large. Further, since the separator built-in portion is sealed, the electrolytic solution does not leak.

Further, in the manufacture of the laminated battery according to the present invention, holes are formed in the positive electrode and the negative electrode, respectively, from the upper surface to the lower surface, and the current collector is formed on the inner wall surface of the holes. The area of the current collector can be increased. Moreover, since the upper and lower surfaces of the separator built-in portion are sealed with the lid of the insulating material, leakage of the electrolytic solution can be reliably prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a perspective view showing an embodiment of a laminated battery according to the present invention, FIG. 1B is its EE sectional view, FIG. 1C is its FF sectional view, and FIG. D) is a GG sectional view. In these figures, 1 is a positive electrode, 2 is a negative electrode, and 3 is an insulating material, and these are laminated and integrated by a thick film forming method such as a screen printing method or a sheet method. Reference numeral 4 denotes a positive electrode current collector formed on the positive electrode 1 on both sides of the laminated body as described above. The inner wall surface of the hole 1a formed by penetrating from the upper surface to the lower surface of the laminated body is coated with Al or the like by plating or the like. I wore it. Similarly, 5 is a negative electrode current collector formed by depositing Cu or the like on the inner wall surface of the hole 2a of the negative electrode 2. Reference numeral 6 denotes a separator obtained by impregnating a non-woven fabric or the like with an electrolyte solution, and the separator 6 is filled in a hole 1b formed between the positive electrode 1 and the negative electrode 2 so as to penetrate from the upper surface to the lower surface of the laminate. By covering the upper and lower surfaces with the lid 7 made of an insulating material, the inside of the laminate is hermetically sealed. Reference numerals 8 and 9 denote terminal electrodes formed by being attached to the outer surface of the laminated body and connected to the positive electrode current collector 4 and the negative electrode current collector 5, respectively. That is, the negative electrodes 2 and 2 are opposed to the positive electrodes 1 and 1 on both sides of the laminated body via the separators 6 and 6, respectively, and the negative electrode current collectors 5 and 5 of the negative electrodes 2 and 2 are opposed to each other.
Are connected by the terminal electrode 9 to form a stacked battery having a structure in which two batteries are arranged in parallel.

Explaining a concrete material constitutional example, the positive electrode 1 is a positive electrode material formed of a positive electrode active material such as LiCoO ₂ together with a resin as a binder, and the negative electrode 2
Is a negative electrode material made of, for example, C (graphite).
Further, for the insulator 3 and the lid 7, for example, vinylidene fluoride resin (PVDF) or the like is used, and for the separator 6,
For example, a non-woven fabric such as polypropylene impregnated with a liquid electrolyte in which, for example, LiClO ₄ is dissolved in a polar organic solvent is used.

The method of manufacturing the above-mentioned laminated battery will be explained with reference to FIGS. 2 to 4 by taking a printing method as an example. First, in FIG. 2, the positive electrode material 1e is printed on both sides of the base ( a) a portion where the negative electrode material 2e is printed with the same thickness as the positive electrode material 1e with a gap between the positive electrode material 1e and the positive electrode material 1e (b), and the positive electrode material 1e and the negative electrode material 2e are not printed Then, the insulating material 3e is printed with the same thickness as the positive electrode material 1e (c). Next, the positive electrode material 1f is printed on the positive electrode material 1e (d), and the negative electrode material 2f and the insulating material 3f are similarly printed (e) (f). After that, the steps (d) to (f) are repeated until a predetermined thickness is obtained, which is dried and, if necessary, fired to be integrated to form a hexahedron composed of the positive electrode 1, the negative electrode 2, and the insulating material 3. (G).

Next, in FIG. 3, a hole 1a is formed through the upper surface and the lower surface of the positive electrode 1 on both sides of the laminate by laser or machining (a), and the inner wall surface on one side of the hole 1a is formed. And a part of the upper surface is coated with Al etc. by plating,
The positive electrode current collector 4 and the extraction electrode 4a are formed (b).

Then, a hole 2a penetrating from the upper surface to the lower surface is formed in a part of the negative electrode 2 and a part of the insulating material 3 between the negative electrode 2 (c), and the negative electrode 2 on the inner wall surface of the hole 2a is formed. Cu or the like is deposited on the exposed surface and a part of the upper surface by plating or the like to form the negative electrode current collector 5 and the extraction electrode 5a (d). In addition, during the above-mentioned plating process, the portion not requiring plating is prevented from being plated with a resist or the like.

Next, the insulating material 3 between the positive electrode 1 and the negative electrode 2
A hole 10 penetrating from the upper surface to the lower surface is formed in a part of (e). It is preferable to provide stepped portions 10a on the upper and lower surfaces of the hole 10 so that the lid 7 described later can be easily attached and can be completely sealed.

Next, as shown in the perspective view of FIG. 4A and the plan view of FIG. 4B, the hole 10 is filled with a separator 6 impregnated with a liquid electrolyte. After this, the separator 6
The upper and lower surfaces are closed and sealed with a lid 7 made of an insulating material to prevent leakage of the electrolytic solution, and the terminal electrodes 8 and 9 are connected to the positive electrode current collector 4 and the negative electrode current collector 5, respectively, to form a laminated body. 1 is formed on the outer surface of the substrate by a thin film forming method such as plating, baking, vapor deposition, or sputtering.
The laminated battery shown in (A) is obtained.

The laminate is not printed by a printing method,
In the case of forming by the gating method, the positive electrode 1, the negative electrode 2, the insulating material 3
Are formed by a sheet method, and a positive electrode sheet (or a negative electrode sheet or an insulating material sheet) is overlaid to a predetermined thickness and integrated by hot pressing, and then a current collector and a terminal electrode are formed as described above. To do.

[0017]

According to the first aspect of the present invention, a separator including a positive electrode, an insulating material, and a negative electrode is formed by a film forming technique, and an electrolytic solution is filled as an electrolyte between the facing surfaces of the positive electrode and the negative electrode. Since it has a built-in battery, it is possible to obtain a stacked battery that can be made smaller and thinner and has a large current value that can be taken out. Further, since the separator built-in portion is sealed, it is possible to prevent leakage of the electrolytic solution.

According to the second aspect of the present invention, the positive electrode and the negative electrode are partially formed with holes penetrating from the upper surface to the lower surface, and the current collector is formed on the inner wall surface of the hole. The area can be increased and the efficiency of the current value that can be taken out increases. Further, since the upper and lower surfaces of the separator built-in portion are sealed with the lid of the insulating material, the leakage of the electrolytic solution can be more reliably prevented.

[Brief description of drawings]

FIG. 1A is a perspective view showing an embodiment of a laminated battery according to the present invention, and FIGS. 1B, 1C and 1D are respectively A).
FIG. 7 is a sectional view taken along line EE, FF, and GG of FIG.

FIG. 2 is a diagram showing a part of the manufacturing process of the example.

FIG. 3 is a view showing the rest of the manufacturing process of the example.

FIG. 4 is a view showing the rest of the manufacturing process of the example.

[Explanation of symbols]

1 positive electrode 1a, 2a, 10 holes 1e, 1f Positive electrode material 2 Negative electrode 2e, 2f negative electrode material 3, 3e, 3f insulation 4 Positive electrode current collector 4a, 5a Extraction electrode 5 Negative electrode current collector 6 separator 7 lid 8 and 9 terminal electrodes

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-6-302334 (JP, A) JP-A-54-18043 (JP, A) JP-A-3-238771 (JP, A) Actual development Sho-58- 110973 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01M 6/02 H01M 10/04 H01M 6/16 H01M 10/12

Claims (2)

(57) [Claims] 1. A separator comprising a positive electrode, an insulating material and a negative electrode formed by a film forming technique, wherein the insulating material has a cutout portion, and the cutout portion is filled with an electrolytic solution. A laminated battery having a built-in structure and a structure in which the separator built-in portion is sealed. 2. The method for manufacturing a laminated battery according to claim 1, wherein a hexahedral laminated body including a positive electrode, a negative electrode, and an insulating material between the positive electrode and the negative electrode is formed by a thick film forming method, and the positive electrode is formed. A hole penetrating from the upper surface to the lower surface is formed in each of the negative electrode and the negative electrode, a current collector is formed on the inner wall surface of the hole, and a hole penetrating from the upper surface to the lower surface is formed in a part of the insulating material. , A positive electrode and a negative electrode are opposed to each other to form a cutout portion of the insulating material, and the cutout portion of the insulating material contains a separator, and the upper and lower surfaces of the separator built-in portion are sealed with an insulating material lid. A method of manufacturing a laminated battery, comprising: