JPH05121056A - Thin type battery - Google Patents

Abstract

PURPOSE:To obtain a thin type battery of high productivity and high reliability by decreasing the heating value of the battery and also increasing the heat radiation efficiency. CONSTITUTION:A positive electrode 2 10mm wide is covered with an insulating film l in such a manner that one side of the electrode and one-end corner-part thereof may be rolled respectively in the film, and then a positive-electrode active-material 3 consisting mainly of MnO2 is printed on the surface of the positive-electrode 2 in a region B other than regions A, C at both ends thereof. Furthermore, a solid-state electrolyte 4 comprising lithium perchlorate added to polyethylene oxide is printed to cover the active material 3. A polypropylene group heat bonding resin 5 is applied to a zone between the regions A, C in a predetermined width. An Li negative-electrode active-material 7 is printed on the surface of a negative-electrode current collecting body 6 having the same width of 10mm as a positive- electrode current collecting body 2 in its region B, a solid-state electrolyte 8 equal in material to the electrolyte 4 is printed on the active material, and then a bonding resin 5' equal in material to the resin 5 is applied. The current collecting bodies 6,2 are faced at their B regions to each other, then they are shifted by a distance of approximately 0.7mm from each other so as to be overlapped together and the resins 5, 5' are mutually bonded by heat under reduced pressure so that the bodies are wound spirally round each other. A negative- electrode terminal board 11 is arranged on,the lower face of frame body 10 made of heat bonding resin, then the resultant spiral current collecting body 9' is arranged, and a positive- electrode terminal-board 12 is arranged on the upper face thereof. Then the terminal boards are respectively bonded to the frame body 10 so as to complete a thin type battery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin battery used in the field of equipment requiring high power, automobiles and small electronic equipment.

[0002]

2. Description of the Related Art Conventionally, a thin battery of this type has a structure as shown in FIG. 1, in which a positive electrode current collector is provided above and below a power generating element in which a positive electrode active material layer, an electrolyte layer and a negative electrode active material layer are layered. A body-cum-battery and a negative electrode current-collector-cell were arranged, and the adhesive resin and the current-collector-cell were integrated.

[0003]

In such a conventional structure, when a plurality of batteries are stacked in order to obtain high power, heat during energization is accumulated between the stacks, which may deteriorate the battery performance. The present invention has been made in view of the above problems, and an object of the present invention is to provide a thin battery that reduces heat generation amount and enhances heat dissipation efficiency, has high productivity, and has high reliability.

[0004]

In order to achieve the above object, the present invention has a width of 3 mm to 50 mm in which a positive electrode active material is held.
The width that holds the ribbon-shaped positive electrode current collector and negative electrode active material is 3
mm to 50 mm ribbon-shaped negative electrode current collectors are overlapped so that the active material surfaces face each other and spirally wound, and the spirally wound upper and lower surfaces serve as respective current collectors, and terminals are provided to them. That the terminals are connected, that the terminal part is also wound in a spiral shape and also serves as a battery container, and that the positive electrode current collector and the negative electrode current collector are housed in the battery container, the positive electrode current collector and the negative electrode current collector. 0.2mm-2.5m in the width direction
m (preferably 0.5 mm to 1.5 mm) shifted and superposed, and wound in a spiral shape, current collecting portion (end portion of A region)
Except that each active material is held on at least one surface of each current collector except for each current collector, and each current collector is excluded (a region C) and a part (C region) opposite to the current collector. Each active material is held on at least one surface (B area) of the current collector, and the current collector (A
The area inside the area (the end of the area) (area D) and the opposite surface where each active material is not retained (area C) are coated with a sealing agent, and the area D of the positive electrode current collector and the negative electrode current collector are covered. C region of positive electrode current collector and D region of negative electrode current collector are sealed to each other, and the upper surface of the battery container is circular, elliptical, rectangular, rounded rectangular, polygonal or the like. That the positive electrode current collector and the negative electrode current collector are spirally wound around the support pillar, the support pillar has a shape corresponding to the shape of the battery container, and the height of the support pillar is equal to the inner height of the battery container. It is characterized by being equal to or less than that.

An active material having a thickness of several tens of microns is coated or screened on both surfaces of the ribbon-shaped positive electrode current collector and the negative electrode current collector.
Each of the current collectors, which are held by printing, etc., and further hold the electrolyte in the same manner so as to completely cover them, are stacked so that the surfaces of the active materials face each other. At that time, the current collector is slightly shifted in the width direction so that the region where the active material is not held does not contact the active material. The stacked ribbon-shaped current collectors are spirally wound and housed in a battery container whose upper and lower surfaces are electrically insulated. At this time, conductive resin / paint is placed on the inner surface of the upper lid and the inner surface of the lower lid of the battery container, and the upper and lower collectors of the spirally wound current collector are on the upper surface of the battery container (corresponding to terminals). Electrical contact) and the lower surface (corresponding to the terminal). Further, the battery container was closed under reduced pressure. Such a thin battery has a short current collecting distance, can easily dissipate heat from the current collector, and can be continuously processed into a ribbon shape and can be cut as required, so that it can be manufactured with high productivity.

As shown in FIG. 2, battery containers are formed by enclosing three sides, electrically insulating the upper surface, and electrically connecting the battery containers having side portions as terminals, and electrically insulating the combined portions from each other. May be.

[0007]

EXAMPLES Details of the present invention will be described below with reference to examples. As shown in FIG. 3, a positive electrode current collector having a width of about 10 mm, which is coated with an electrically insulating film 1 (which may be a thermo-adhesive resin) so as to wrap around one side and one corner, and is processed into a ribbon shape. A region where the positive electrode active material 3 containing manganese dioxide as a main component is excluded from both ends (A region having a width of about 1.5 mm and C region having a width of about 1 mm in the figure) on the surface of 2 (stainless steel current collector). Screen printing with a width of about 7.5 mm in the (B region), and the polymer solid electrolyte 4 obtained by adding lithium perchlorate to polyethylene oxide so as to cover the surface of the positive electrode active material 3 is also screen printed. did. A cross section is shown in FIG. Then A
Inside the area (may be omitted when the electrically insulating film 1 is wound on the counter electrode) and inside the area C (may be omitted when the electrically insulating film 1 is wound on the counter electrode) A polypropylene-based thermo-adhesive resin 5 having a width of about 0.8 mm was applied or adhered thereto. In addition, the negative electrode active material 7 made of lithium is formed on both surfaces of the positive electrode current collector 1 and the surface of the negative electrode current collector 6 (stainless steel current collector) having a width of about 10 mm which is processed in the same manner as above. Screen printing is performed with a width of about 7.5 mm in a region (B 'region) excluding an A'region having a width of about 1.5 mm and a C'region having a width of about 1 mm, and the negative electrode active material. 7
The polymer solid electrolyte 8 in which lithium perchlorate was added to polyethylene oxide was screen printed in the same manner so as to cover the surface of. Next, similar to the above, inside the A'region (may be omitted when the electrical insulating film 1 is wound on the counter electrode)
A polypropylene thermal adhesive resin 5 having a width of about 0.8 mm was applied or adhered to the inside of the area C and C '(may be omitted when the electric insulating film 1 is wound around the counter electrode). The A region of the positive electrode current collector 2 and the C ′ region of the negative electrode current collector 6 processed in this way, and the C region of the positive electrode current collector 2 and the A ′ region of the negative electrode current collector 6 face each other (B regions are About 0.7)
The polypropylene-based heat-adhesive resins 5 and 5 ′ were heat-sealed under a reduced pressure by stacking them with a shift of mm, and the inside of the current collector was sealed under a reduced pressure. Next, the current collector 9 which was vacuum-tightly sealed around a cylinder 8 having a diameter of about 2 mm and a height of about 10.5 mm was spirally wound (shown in FIG. 5), and the overall outer diameter was about 50 mm.
I tried to become. (A perspective view is shown in FIG. 6.)

Further, the negative electrode terminal plate 11 (made of stainless steel and having a thickness of 10 mm) is formed on the lower surface of the thermo-adhesive resin frame body 10 (inner diameter: about 50 mm, height: about 11 mm) shown in the sectional view of FIG. 7 and the perspective view of FIG. About 0.3 mm, and the inner surface is coated with a conductive substance). Next, a current collector 9'wound in a spiral shape is placed in the frame body 10, and then the positive electrode terminal plate 12 (made of stainless steel and having a thickness of about 0.3 mm and an electrically conductive substance applied on the inner surface) is arranged on the upper surface. Are placed, and each terminal plate is bonded to the frame body 10 by heat fusion under reduced pressure. At this time, the current collector 9 '
The negative electrode current collector 6 ′ and the positive electrode current collector 2 ′ are electrically connected to the inner surfaces of the negative electrode terminal plate 11 and the positive electrode terminal plate 12, respectively. The enlarged cross-sectional state at that time is shown in FIG.

Table 1 shows the maximum surface temperature of the battery when the battery having the structure of FIG. 8 according to the embodiment of the present invention and the battery having the conventional structure were charged and discharged.

[0010]

As described above, the battery of the present invention can reduce the temperature rise during energization. Further, the internal resistance of the battery of the present invention was reduced by about 8% as compared with the conventional battery.

[0012]

INDUSTRIAL APPLICABILITY As described above, the present invention can provide a thin battery with high productivity and high reliability, and therefore its industrial value is extremely large.

[Brief description of drawings]

FIG. 1 is a perspective view of a conventional battery.

FIG. 2 is a perspective view of a battery container of the thin battery of the present invention.

FIG. 3 is a perspective view of each current collector of the thin battery of the present invention.

FIG. 4 is a cross-sectional view of a current collector of the thin battery of the present invention.

FIG. 5 is a state diagram showing a state where the current collector 9 of the thin battery of the present invention is being spirally wound.

FIG. 6 is a completed view in which the current collector 9 of the thin battery of the present invention is spirally wound.

FIG. 7 is a vertical cross-sectional view of the thin battery of the present invention.

FIG. 8 is a perspective view of a thin battery of the present invention.

FIG. 9 is an enlarged vertical sectional view of the thin battery of the present invention.

[Explanation of symbols]

 1 Electrical Insulation Film 2 Positive Electrode Current Collector 2'Positive Electrode Current Collection Part 3 Positive Electrode Active Material 4 Polymer Solid Electrolyte 5, 5'Heat Adhesive Resin 6 Negative Current Collector 6'Negative Current Collection Part 7 Negative Electrode Active Material 8 Supports 9 Current collector sealed under reduced pressure 9 ′ Current collector wound in a spiral shape 10 Frame body 11 Negative electrode terminal plate 12 Positive electrode terminal plate

Claims (14)

[Claims] 1. A thin battery comprising a power generation element in which a positive electrode active material, an electrolyte layer and a negative electrode active material are layered, and a ribbon-shaped positive electrode current collector holding the positive electrode active material and a ribbon holding the negative electrode active material. -Shaped negative electrode current collectors were overlapped with each other so that the active material surfaces face each other, and were spirally wound, and the spirally wound upper and lower surfaces were used as respective current collectors, and terminal parts were connected to them. A thin battery, characterized in that a positive electrode current collector and a negative electrode current collector whose terminals are spirally wound also as a battery container are housed in the battery container. 2. The ribbon-shaped positive electrode current collector and negative electrode current collector have a width of 3 mm to 50 mm.
The thin battery described. 3. A positive electrode current collector and a negative electrode current collector having a width of 0.
The thin battery according to claim 1 or 2, wherein the thin battery is spirally wound and overlapped with a shift of 2 mm to 2.5 mm. 4. A positive electrode current collector and a negative electrode current collector having a width of 0.
The thin battery according to claim 1 or 2, wherein the thin battery is wound in a spiral shape with a shift of 5 mm to 1.5 mm and the layers are stacked. 5. The active material is coated on at least one surface of each current collector except for the current collector (the end portion of the area A), according to claim 1, 2, 3 or 4. Thin battery. 6. An active material is coated on at least one surface (B area) of each current collector except for the current collecting section (the end of the A area) and a part (C area) opposite to the current collecting section. The thin battery according to claim 1, 2, 3, or 4, wherein 7. A region (D region) inside the current collecting portion (end portion of region A) and an opposite surface (C which is not covered with each active material).
Area) is covered with a sealing agent, and the area D of the positive electrode current collector and the area C of the negative electrode current collector or the area C of the positive electrode current collector and the area D of the negative electrode current collector are sealed to each other. The thin battery according to claim 1, 2, 3, 4, 5 or 6. 8. The thin battery according to claim 1, wherein the upper surface and the lower surface of the battery container have a circular shape, an elliptical shape, a rectangular shape, a rounded rectangular shape, or a polygonal shape. 9. The positive electrode current collector and the negative electrode current collector are spirally wound around a column.
The thin battery described. 10. The thin battery according to claim 1, wherein the pillar has a shape corresponding to the shape of the battery container. 11. The thin battery according to claim 1, wherein the height of the pillar is equal to or less than the inner height of the battery container. 12. The terminal portion of each current collector is electrically connected to the inner surfaces of the upper and lower surfaces of the battery container, the outer surfaces of the upper and lower surfaces thereof are electrically insulated, and the side surfaces thereof serve as terminals. The thin battery according to claim 1 or 2, characterized in that. 13. The thin battery according to claim 1, wherein the current collector is a vapor deposition film. 14. The thin battery according to claim 1, wherein an electric insulating film is provided on one surface of the current collector.