JP2003059542A - Photo-charging secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photo-charging secondary battery equipped with charging performance withstanding repeated use by combining a photoelectric transfer sheet with a photoelectric transfer element formed with elasticity and durability, which can make use of a plurality of shapes of storage batteries in place of the above storage battery. SOLUTION: With the photo-charging secondary battery 1 provided with a winding core part 2 of a cylindrical shape, a photoelectric transfer element 3 with elasticity wound up around the winding core part 2 in free drawing out, a storage battery 4 capable of charging and discharging, and a control circuit part 5 controlling charge and discharge of the storage battery 4, taking on nearly a cylindrical shape in a state where the photoelectric transfer element 3 is wound around the winding core part 2, the storage battery 4 is free to be attached to and detached from the winding core part 2, two or more kinds of storage batteries 4 with different sizes can replace the above storage battery 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photo-chargeable secondary battery configured to charge a storage battery with a photoelectric conversion element. More particularly, the present invention relates to a light rechargeable secondary battery which can be attached to and detached from a winding core part and can be used not only for a storage battery having a specific shape but also for a storage battery having a shape smaller than the storage battery by using a holding means. .

[0002]

2. Description of the Related Art A photoelectric conversion element, which is also called a solar cell, is an element for converting light energy such as sunlight into electric energy. When extracting electric energy from light energy, this photoelectric conversion element does not generate emissions such as carbon dioxide, unlike fossil fuels that have been conventionally used. In addition, since the photoelectric conversion element can extract electric energy from light energy such as sunlight, which is said to be almost inexhaustible, it can generate power semipermanently. Therefore, in view of global environmental problems, it is considered that the photoelectric conversion element will be used in a wider range of applications and scales.

However, in many cases, the light energy of sunlight or the like has a large temporal variation, and the electrical energy generated by converting this light energy also has a large temporal variation, so that the photoelectric conversion element is large. Are often not suitable for being used as a direct power source for electrical equipment. Also,
The photoelectric conversion element requires a large light receiving area in order to obtain a predetermined amount of electric power suitable for use, because the light energy of sunlight or the like exists in a spatially diluted state. Therefore, the photoelectric conversion element is used as an auxiliary current for an electric device, or for the purpose of charging the storage battery once with the converted electric energy and discharging the storage battery for use.

On the other hand, electric devices have been reduced in size due to the progress of various processing techniques in recent years, and are often used as portable devices. Therefore, in an electric device, a dry battery that is convenient and easy to carry is usually used as a power source. Therefore, a photo-chargeable secondary battery, which combines the advantages of the photoelectric conversion element as described above and the convenience of a dry battery, is disclosed in, for example, JP-A-63-31478.
No. 0 (battery), JP-A-2-73675 (cylindrical rechargeable solar cell), and the like have been proposed. Such a conventional photo-chargeable secondary battery is a commonly used electric device by combining a photoelectric conversion element as a power generation unit and a storage battery as a charging / discharging unit in a cylindrical standard battery type. It has been realized that it is driven by electric power produced by light energy.

[0005] However, the conventional photo-chargeable secondary battery, the light energy such as sunlight radiated from one direction,
Not only is it difficult to make the photoelectric conversion element receive light by effectively utilizing all of the external surface area of the storage battery, but also the structure cannot provide the light receiving area of the photoelectric conversion element beyond the external surface area of the storage battery. Therefore, the conventional photo-chargeable secondary battery, charging time when charging the storage battery is too long to withstand practical use, and even the photoelectric conversion element may not be able to generate even the power required to charge the storage battery. There was a problem.

Therefore, the inventors of the present invention have a structure in which a photoelectric conversion element having flexibility and a storage battery are combined so that light energy such as sunlight can be used as a power source for an electric device that is normally used. Invented a photo-chargeable secondary battery that can be used (Japanese Patent Application No. 10-3515).
No. 05). According to the present invention, the present inventors have realized a photo-chargeable secondary battery which has practical charging performance and is easy to use as a power source of a commonly used electric device.

Further, in the above-mentioned photo-chargeable secondary battery, when the storage battery is charged, the flexible photoelectric conversion element is repeatedly stretched to increase the light receiving area for use. At this time, the photoelectric conversion element receives an external force of repeated stretching. As a result of trial manufacture, it was found that this external force is generated by friction between the flexible photoelectric conversion element and its sliding system, and must be large enough to be overlooked. In this case, it was found that the photoelectric conversion element was damaged or deteriorated by the external force, the power generation efficiency of the element as a whole was lowered, and the charging performance was lowered.

[0008]

SUMMARY OF THE INVENTION The present invention is to solve the above problems by combining a flexible photoelectric conversion sheet having a photoelectric conversion element formed thereon and a durable storage battery. Accordingly, it is an object of the present invention to provide a light rechargeable secondary battery having a charging performance that can withstand repeated use. A further object of the present invention is to provide a light rechargeable secondary battery, which can be used as the above-mentioned storage battery not only in a specific shape but also in a storage battery having two or more sizes.

[0009]

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted extensive studies as a means of achieving the above-mentioned object, and as a result, have a cylindrical winding core portion and a drawer wound around the winding core portion. A flexible photoelectric conversion element, which is freely arranged.
A rechargeable secondary battery having a chargeable / dischargeable storage battery and a control circuit unit for controlling charge / discharge of the storage battery, and having the photoelectric conversion element wound around the winding core, and having a substantially cylindrical overall shape. In the above, the storage battery is detachably attached to the winding core portion, and by using a storage battery having a specific shape, and a holding means, the storage battery having a smaller size can be used. We have completed the secondary battery.

More specifically, the photo-chargeable secondary battery according to the present invention is characterized in that it has a predetermined cylindrical battery standard shape in a state where the photoelectric conversion element is wound around the winding core.
The storage battery has a discharge voltage of 0.6 to 1.9 V, the storage battery has a shape of a predetermined cylindrical battery standard, and when the storage battery having the small shape is used, A storage battery holding means is used, and the storage battery holding means is a photo-chargeable secondary battery characterized in that it is held by elastic force. As a result, storage batteries can be of multiple shapes,
Since the versatility is expanded, it has been found that the practicality can be improved. Further studies have been conducted, and the present invention has been completed.

That is, the present invention provides (1) a cylindrical winding core portion, a flexible photoelectric conversion element wound around the winding core portion and arranged so as to be able to be drawn out, and charge / discharge. A possible storage battery and a control circuit unit that controls the charging and discharging of the storage battery, in a state in which the photoelectric conversion element is wound around the winding core portion, in a photo-chargeable secondary battery having a substantially cylindrical overall shape, The above-mentioned storage battery is detachable with respect to the above-mentioned winding core part, and two or more types of storage batteries having different sizes can be used in place of the above-mentioned storage battery. The photo-rechargeable secondary battery according to (1) above, wherein the photoelectric conversion element is wound around the portion to have a predetermined cylindrical battery standard shape, and (3) the storage battery has a discharge voltage of 0. 6 to 1.9 V, (1) above, characterized in that (4) The photo-chargeable secondary battery according to (2), wherein the cylindrical battery standard is AA, AA or AA, (5) The storage battery Has a shape of a predetermined cylindrical battery standard, (6) the rechargeable secondary battery according to (1), (6) the cylindrical battery standard of the storage battery is AA, AAA, AAA, or a button. In the use of the photo-chargeable secondary battery according to (5) above, or (7) a small-sized storage battery, a holding means is used in the core of the storage battery. (1) The light rechargeable secondary battery described in (8)
The holding means for the storage battery holds the storage battery by elastic force. (9) The photo-chargeable secondary battery described in (7) above.
The holding means for the small-sized storage battery is made of a conductive material, and the photo-chargeable secondary battery according to (7) or (8) above, or (10) the photo-chargeable secondary battery. Electrical equipment used.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below in detail with reference to the drawings. As a photo-chargeable secondary battery to which the present invention is applied, a photo-chargeable secondary battery 1 as shown in FIGS. 1 and 2 will be described.

The photo-chargeable secondary battery 1 according to the present invention comprises a cylindrical winding core portion 2 and a flexible photoelectric coil wound around the winding core portion 2 so as to be stretchable. The conversion sheet 3 is provided with the storage battery 4 and the control circuit unit 5 provided inside the winding core 2. The light rechargeable secondary battery 1 is
As shown in FIGS. 1 and 2, when the photoelectric conversion sheet 3 is wound around the winding core portion 2, it has an overall cylindrical shape. Further, as shown in FIG. 3, the photo-chargeable secondary battery 1 charges the storage battery 4 by causing the photoelectric conversion sheet 3 to receive light in a state where the photoelectric conversion sheet 3 is extended from the winding core 2.

The winding core portion 2 is formed of a resin material in a cylindrical shape. As the resin material, for example, ABS
(Acrylonitrile-butadiene-styrene) resin, S
AN (styrene-acrylonitrile) resin, ASA (acrylonitrile-styrene-acrylamide) resin, A
CS (acrylonitrile-chlorinated polyethylene-styrene) resin, AAS (acrylonitrile-acrylate-)
It is preferable to use styrene) resin or the like. The winding core portion 2 is formed to be slightly longer than the width around which the photoelectric conversion sheet 3 is wound. Therefore, the light rechargeable secondary battery 1
The winding core 2 can be wound over the entire width of the photoelectric conversion sheet 3. Further, the winding core portion 2 is provided with an upper flange 6 and a lower flange 7 at both ends thereof, respectively. The photoelectric conversion element is usually formed on the photoelectric conversion sheet.

The upper flange 6 and the lower flange 7 are
The winding core 2 is formed of a material similar to that of the winding core 2 into a substantially circular flat plate shape, and is fixed to both ends of the winding core 2 by fixing means such as an adhesive. As the adhesive, those known per se may be used as long as they do not impair the present invention. The upper flange 6 and the lower flange 7 may be formed integrally with the winding core 2.

The upper flange 6 and the lower flange 7 are
The diameter is formed to be substantially the same as or slightly larger than the diameter of the photoelectric conversion sheet 3 wound around the winding core 2. Thereby, the upper flange 6 and the lower flange 7 can protect the side edge portions of the photoelectric conversion sheet 3, and serve as guides for winding the stretched photoelectric conversion sheet 3 around the winding core 2. The photoelectric conversion sheet 3 can be wound around the winding core portion 2 without being displaced.

It is desirable that the winding core 2, the upper flange 6 and the lower flange 7 are made of a material exhibiting electrical insulation. Examples of the material exhibiting electrical insulation include, in addition to liquid crystal polymers, engineered plastics such as modified polyphenylene ether (PPE), polyether ether ketone (PEEK), and polyphenylene sulfide that have chemical resistance, heat resistance, and creep resistance. (P
PS), polyether sulfone (PES), polysulfone (PSF) and the like. As a result, in the photo-chargeable secondary battery 1, internal wiring or the like is short-circuited via these parts, or these parts are electrically short-circuited by coming into contact with, for example, a terminal of a battery housing part of an electric device. This can be prevented.

The winding core 2, the upper flange 6 and the lower flange 7 are preferably made of a material having excellent heat insulating properties. Examples of the material having heat insulating properties include polyamide resins such as para aramid resin and meta aramid resin, vinyl chloride resin, polyester resin, polyethylene resin, polystyrene resin, polyurethane resin and the like. As a result, when the photo-chargeable secondary battery 1 is exposed to a high temperature such as being left on a dashboard of an automobile, the temperature of the storage battery 4 housed therein may rise and be damaged. Can be prevented. For the same reason, the winding core 2, the upper flange 6, and the lower flange 7 are preferably colored in a color that does not easily absorb light or heat, such as white.

Further, the photo-chargeable secondary battery according to the present invention comprises an outer peripheral wall 51, as shown in FIGS. As shown in FIGS. 1 and 2, the light rechargeable secondary battery 1 is configured to include an outer peripheral wall 51 having a substantially cylindrical shape having substantially the same diameter as the upper flange 6 and the lower flange 7. As shown in FIG. 5, the light rechargeable secondary battery 1 has an outer peripheral wall 51 on the upper flange 6 and the lower flange 7, respectively.
6a and groove 7a in which side edges of the groove are rotatably fitted
Is provided. Therefore, in the photo-chargeable secondary battery 1, the outer peripheral wall 51 freely rotates with respect to the winding core 2, the upper flange 6 and the lower flange 7.

Further, as shown in FIG. 6, a slit 51a is bored in the outer peripheral wall 51. Slit 51a
Has a width and a thickness sufficient for pulling out the photoelectric conversion sheet 3, and is perforated in the outer peripheral wall 51. Further, in the light rechargeable secondary battery 1, as shown in FIG. 6, the locking portion 3a is formed on the outermost peripheral portion of the photoelectric conversion sheet 3. The locking portion 3a is formed to have a thickness sufficient to join the slit 51a when the photoelectric conversion sheet 3 is wound around the winding core 2. The locking portion 3a has a function of preventing the photoelectric conversion sheet 3 from being completely wound inside the outer peripheral wall 51, and the photoelectric conversion sheet 3 is also included.
It has a function as a handle when pulling out.

In the photo-chargeable secondary battery 1, as shown in FIG. 2, the photoelectric conversion sheet 3 is pulled out from the winding core 2 by pulling out the locking portion 3a when the storage battery 4 is charged. Further, in the photo-chargeable secondary battery 1, the photoelectric conversion sheet 3 can be wound around the winding core 2 by rotating the outer peripheral wall 51 with respect to the winding core 2. Therefore, in the light rechargeable secondary battery 1, since the outer peripheral wall 51 having the slit 51a is rotatably provided, the photoelectric conversion sheet 3 can be easily pulled out and wound up. In addition, the light rechargeable secondary battery 1 is provided with the outer peripheral wall 51 to prevent the photoelectric conversion sheet 3 from being unraveled when stored in an electric device, and further protects the photoelectric conversion sheet 3. It is possible to prevent the photoelectric conversion sheet 3 from being damaged by dust or impact of the external environment, and also to prevent the storage battery 4 from being heated by direct sunlight or the like. In order to further improve the heating prevention effect of the storage battery 4, the outer peripheral wall 51 is preferably colored in a color that does not easily absorb light or heat, such as white.

The upper flange 6 and the lower flange 7 include
A positive electrode terminal 8 and a negative electrode terminal 9 are provided respectively.
The positive electrode terminal 8 and the negative electrode terminal 9 are made of a dielectric material, and are electrically connected to predetermined terminals of the control circuit section 5 by connecting means (not shown). Examples of the dielectric material include glass, quartz, ceramics, metal oxides such as magnesium oxide and aluminum oxide, and dielectric polymers such as polytetraethylene.

As shown in FIGS. 3 and 4, the photoelectric conversion sheet 3 has a sheet-like substrate 10 which is flexible and is formed into a substantially rectangular sheet shape, and is arranged on the sheet-like substrate 10. It is composed of a plurality of photoelectric conversion elements 11. The sheet-shaped substrate 10 is formed of a material having an insulating property, and is formed in a sheet shape so as to have flexibility. Examples of the insulating material include synthetic resins such as polyester, polyamide, and polyethylene. Each photoelectric conversion element 11 is a sheet-shaped substrate 1
0, the first electrode layer 12, the photoelectric conversion layer 13, and the second
And the electrode layers 14 are sequentially laminated in the form of thin films. As a lamination method, for example, various PVD methods represented by a sputtering method or an evaporation method, or plasma CVD
Method and various CVD methods represented by MOCVD method,
Each layer constituting the photoelectric conversion element 11 is laminated on the sheet substrate 10 in a thin film form. Since the photoelectric conversion element 11 is formed by laminating each layer in a thin film shape, the photoelectric conversion element 11 has sufficient flexibility like the on-sheet substrate 10.

Further, the photoelectric conversion sheet 3 may include a polymer laminated sheet having flexibility. The polymer laminated sheet covers the light receiving portion of the photoelectric conversion element, and this portion has at least light transmittance.
The polymer laminated sheet preferably covers the entire surface of the photoelectric conversion sheet, and is further preferably formed so as to project from the end of the photoelectric conversion sheet and protect the end of the photoelectric conversion sheet. The polymer laminated sheet is preferably provided on the light receiving surface side of the photoelectric conversion sheet, but more preferably provided on the back side of the light receiving surface of the photoelectric conversion sheet. This makes it possible to reduce damage or deterioration of the photoelectric conversion element due to repeated bending of the photoelectric conversion element when the flexible photoelectric conversion element is repeatedly stretched and the light receiving area is increased to be used. Further, due to repeated sliding of the surface due to repeated extension of the photoelectric conversion element, the photoelectric conversion element can be prevented from being damaged or deteriorated, and the power generation efficiency of the entire element is lowered, and thus charging is performed. It is possible to prevent the performance from decreasing. Further, when the photoelectric conversion element is in a wound state for a long period of time, the photoelectric conversion sheet is plastically deformed (a so-called curl is formed), which prevents effective light reception of the photoelectric conversion element. Due to the presence of the laminated sheet, the plastic deformation can be reduced and effective light reception can be obtained.

When the polymer laminated sheet is used for the front and back of the photoelectric conversion sheet as described above, it may be composed of the same sheet material on the front and back sides, or may be composed of different sheet materials as appropriate. As a material, at least a material that covers the light receiving portion of the photoelectric conversion element is a light transmissive material. Further, it is desirable to have abrasion resistance due to friction and weather resistance against light. Examples of such a material include a halogenated olefin, in particular, a polymer of a fluorinated olefin, or a copolymer of this and an olefin. Further, an adhesive layer may be provided to fix these sheets to the photoelectric conversion sheet. The material for this adhesive layer is a copolymer of ethylene and vinyl acetate (EV
A) etc. are illustrated.

In the photoelectric conversion sheet 3, the photoelectric conversion elements 11 are electrically connected to each other in series,
A positive electrode terminal 12a and a negative electrode terminal 14a are formed on the electrode layers of the photoelectric conversion element 11 located at both ends in the lateral direction, respectively. The positive electrode terminal 12a and the negative electrode terminal 14a are electrically connected to predetermined terminals of the control circuit unit 5, respectively.

Further, the photoelectric conversion element 11 is constructed so that light such as sunlight is incident from the main surface 11a on the side opposite to the sheet substrate 10, that is, on the side facing the outside. The first electrode layer 12 and the second electrode layer 14 are made of a dielectric material, and function as a pair of electrodes for the photoelectric conversion layer 13. The photoelectric conversion layer 13 is formed of, for example, an amorphous semiconductor thin film typified by an a-Si pin junction structure, and is configured to generate an electromotive force when light such as sunlight enters. It is formed of a film having a photoelectric conversion effect.

The photoelectric conversion layer 13 is made of p such as perylene.
It may be a pn junction structure formed by a type organic semiconductor and an n type organic semiconductor such as copper phthalocyanine. The photoelectric conversion layer 13 is not limited to the thin film structure described above, and may be formed in a film structure having sufficient flexibility and a photoelectric conversion effect. The first electrode layer 12 is made of, for example, Ag, Al, Cr, Ni,
The photoelectric conversion layer 13 is formed of a metal material such as Cu.
It is desirable that the light receiving element be formed so as to have a high reflectance with respect to the light to be received. Thereby, the photoelectric conversion layer 13
It is possible to improve the photoelectric conversion efficiency of the photoelectric conversion layer 13 by reflecting the light that has passed through and entering the photoelectric conversion layer 13 again. The second electrode layer 14 may be, for example, SnO ₂
Alternatively, it is preferably formed as a so-called transparent electrode formed of a material containing a metal oxide such as In ₂ O ₃ as a main component. Thereby, the light to be received by the photoelectric conversion layer 13 can be efficiently transmitted, and the photoelectric conversion efficiency of the photoelectric conversion layer 13 can be improved.

3 and 4, the first electrode layer 12 and the second electrode layer 14 of the specific photoelectric conversion element 11 are different photoelectric conversion elements adjacent to the photoelectric conversion element 11, respectively. The second electrode layer 14 and the first electrode layer 12 of No. 11 are shown, and an example in which a plurality of photoelectric conversion elements 11 share each electrode layer is shown. This allows
In the photoelectric conversion sheet 3, adjacent photoelectric conversion elements 1
One of them is electrically connected in series. In this case, for example, the first electrode layer 12 and the second electrode layer 14 are formed of SnO ₂ or In ₂ O as described above.
Formed of a material containing a metal oxide such as ₃ as a main component,
A light reflection layer (not shown) formed of, for example, a metal material may be provided between the first electrode layer 12 and the sheet-shaped substrate 10. Thereby, each photoelectric conversion element 1
1 can receive a sufficient amount of light through the second electrode layer 14, and can improve the photoelectric conversion efficiency by the light reflecting layer. Further, in this case, the photoelectric conversion elements 11 are connected to each other by a line by an electrode having a length substantially equal to the length in the longitudinal direction.
Therefore, for example, as compared with the case where the photoelectric conversion elements 11 are connected to each other at a point by a lead wire or the like,
It is possible to reduce the risk that a connection failure such as disconnection will occur.

Further, in the photoelectric conversion sheet 3, each photoelectric conversion element 11 is arranged in parallel with the longitudinal direction thereof. That is, the pair of electrode layers of each photoelectric conversion element 11 is arranged so as to be parallel to the longitudinal direction of the photoelectric conversion sheet 3. As a result, the photo-rechargeable secondary battery is a photoelectric conversion sheet even when a part of the photoelectric conversion element is not sufficiently irradiated with light when the photoelectric conversion sheet 3 is stretched to charge a storage battery. It is possible to prevent the overall power generation efficiency from decreasing. Further, the photoelectric conversion sheet 3 is wound around the winding core portion 2 and arranged so as to be stretchable, and one side of the innermost peripheral side is connected and fixed to the winding core portion 2. The photoelectric conversion sheet 3 is
The positive electrode terminal 12a and the negative electrode terminal 14a described above are provided on one side of the innermost peripheral side. As shown in FIGS. 7 and 8, the end portion of the photoelectric conversion element 11 of the photoelectric conversion sheet 3 is connected to the winding core portion 2 so that the end portion of the photoelectric conversion element 11 can be sufficiently outside the slit 51a of the outer peripheral wall 51 in the stretched state. The photoelectric conversion element portion is fixed to the photoelectric conversion sheet 3 from one side, which is the innermost peripheral side of the photoelectric conversion sheet 3 that is fixed, to the end portion on the inner peripheral side of the photoelectric conversion element portion 11 of the photoelectric conversion sheet 3. A sheet portion 31 having no positive electrode 11 and having a positive electrode terminal 12a and a negative electrode terminal 14a is interposed. Thereby, in the charging operation, it is possible to prevent light from being blocked by the outer peripheral wall 51 of the photoelectric conversion element 11 due to insufficient extraction. Furthermore, the photoelectric conversion element portion 11 can be moved from the inner circumference having a high curvature to the outer circumference side having a lower curvature, and fatigue deterioration due to bending of the photoelectric conversion element 11 can be reduced. Further, the sheet portion 31 not having the photoelectric conversion element can be made higher in flexibility than the sheet portion 31 having the photoelectric conversion element, and the durability of connection and fixation of the photoelectric conversion sheet 3 to the winding core portion 2 is improved. be able to. In this case, the sheet portion 31 having no photoelectric conversion element may be formed integrally with the photoelectric conversion sheet 3, but may be formed by connecting sheets of the same or different materials as necessary. .

Further, the photoelectric conversion sheet 3 can be arranged so that the light receiving surface thereof is inside when wound around the winding core 2. Thereby, in the photo-chargeable secondary battery 1, when the photoelectric conversion sheet 3 is wound around the winding core 2 and used for discharging, the light receiving surface of the photoelectric conversion sheet 3 is not exposed to the outside. It is possible to prevent the light receiving surface from being damaged or damaged. However, although the photoelectric conversion sheet 3 is arranged so as to be wound around the winding core portion 2 with its light receiving surface inside, it is not limited to such a configuration, and the present embodiment is not limited thereto. As in form,
When there is little concern about the damage, the photoelectric conversion sheet 3 is
The light-receiving surface can be arranged so as to be wound around the core 2.

The storage battery 4 is a secondary battery which is housed in the inner space of the winding core 2 and can be charged and discharged. Storage battery 4
Specifically, for example, nickel-hydrogen secondary battery, nickel-cadmium secondary battery, nickel-zinc secondary battery,
Examples thereof include a zinc-silver oxide secondary battery and an iron-nickel secondary battery. The storage battery 4 is preferably a nickel-hydrogen secondary battery. As a result, the storage battery 4 can improve the energy density per volume and does not use heavy metals such as lead and cadmium and has excellent environmental compatibility.

The storage battery 4 may be a standard dry battery having a predetermined battery standard shape. The storage battery 4 is, specifically,
R6 type battery called so-called AA type, R03 type battery called AA type, which is defined by IEC, JIS, etc.
It may be an R1 type battery called AA type, or an R44 type battery called R1220 type battery called a button type. As a result, the development / manufacturing cost of the photo-chargeable secondary battery 1 can be suppressed. In addition, the storage battery 4
Is configured to be detachable from the winding core 2. Specifically, for example, a part of the lower flange 7 can be opened and closed, and the storage battery 4 is connected to the winding core 2 from this opening and closing part.
May be inserted and removed. Or, for example,
The photoelectric conversion sheet 3 may be stretched so that a part of the core portion 2 exposed to the outside can be opened and closed, and the storage battery 4 can be attached to and detached from the core portion 2 from the opening / closing portion. .

As a result, in the photo-chargeable secondary battery 1, only the storage battery 4 can be replaced even when the storage battery 4 has been charged and discharged repeatedly and has reached the end of its life. Therefore, the photo-rechargeable secondary battery 1 does not need to discard other parts having a longer life than the storage battery 4 together with the storage battery 4 that has reached the end of life, which is desirable from the viewpoint of effective utilization of resources. Further, as a result, the photo-chargeable secondary battery 1 can be used as a charger for charging the storage battery 4. That is, it is also possible to charge the storage battery 4 with the photo-chargeable secondary battery 1, take out the charged storage battery 4 from the photo-chargeable secondary battery 1, and use the storage battery 4 as a power source of the electronic device.

Further, as the storage battery 4, the standard storage battery is used as described above, and it is detachable from the winding core 2. As described above, the standard rechargeable battery is detachably used as the rechargeable battery 4, so that the rechargeable secondary battery 1 can easily and easily perform the replacement work when the rechargeable battery 4 is replaced. Also in this case, as described above,
The light rechargeable secondary battery 1 may be used as a charger for charging the storage battery 4. As a result, the storage battery 4 having the standard storage battery shape is detachable from the light-chargeable secondary battery 1 and can be easily used for an electric device that uses a normal standard battery as a power source. Further, it is desirable that the discharge voltage of the storage battery 4 is about 0.6 to 1.9V.
As a result, when the light rechargeable secondary battery 1 is used for an electric device that uses a normal cylindrical standard battery as a power source, it cannot be operated below the operating voltage of the electric device. It is possible to prevent the device from being damaged due to exceeding the allowable voltage.

The control circuit section 5 is arranged in the inner space of the winding core section 2 as shown in FIG. The control circuit unit 5 is
The photoelectric conversion sheet 3 and the storage battery 4 are appropriately provided with one or more functions selected from a rectification function, a photoelectric conversion sheet 3 overcharge prevention function for the storage battery 4, an overdischarge prevention function for the storage battery 4, and the like. The control circuit unit 5 can be specifically configured by an electric circuit using a diode, an operational amplifier, or the like. However, the rectifier circuit, the overcharge prevention circuit, and the Since it can be configured by an overdischarge prevention circuit, detailed description of the circuit configuration will be omitted. Further, the control circuit unit 5 includes at least four terminals, and these terminals are provided with the positive electrode terminal 12a and the negative electrode terminal 14a of the photoelectric conversion sheet 3, respectively.
And the positive electrode terminal and the negative electrode terminal of the storage battery 4 are electrically connected. Then, the control circuit unit 5 functions so that the storage battery 4 can be efficiently charged by the photoelectric conversion sheet 3 and discharged from the storage battery 4.

The light rechargeable secondary battery 1 is constructed as described above, and in the state where the photoelectric conversion sheet 3 is wound around the winding core portion 2, as shown in FIG. . In this state, the light rechargeable secondary battery 1 can be easily attached to and detached from these electric devices as a power source for the electric devices. Examples of the electric device include a mobile phone and a portable music player. Further, in the light rechargeable secondary battery 1, it is desirable that dimensions and the like of each part are determined so as to have a predetermined tubular battery standard shape in a state where the photoelectric conversion sheet 3 is wound around the winding core 2. Light rechargeable secondary battery 1
Is, for example, an R20 type battery called a so-called A1 type, an R14 type battery called a A2 type, or an R3 type called an AA type, which is defined by IEC or JIS.
It may be a 6-type battery or the like.

As a result, the light rechargeable secondary battery 1 can be easily used for an electric device designed to accommodate and use a normal cylindrical standard battery.
Therefore, in this case, the light rechargeable secondary battery 1 should convert the light energy of sunlight into electric energy and store it, and use it as a power source for an electric device using a tubular standard battery that is normally used. You can Further, as shown in FIG. 3, the photo-chargeable secondary battery 1 charges the storage battery 4 in a state where the photoelectric conversion sheet 3 is extended from the winding core 2. At this time, since all of the photo-chargeable secondary battery 1 can be directed to the light receiving area of the photoelectric conversion sheet 3 in the light irradiation direction, the power generation of the photoelectric conversion sheet 3 can be improved. Therefore, the light rechargeable secondary battery 1 is equivalent to the storage battery 4
The charging time for charging can be shortened sufficiently for practical use.

The photo-chargeable secondary battery according to the present invention is
As shown in FIGS. 9 to 11, the storage battery 4 having a specific shape
Furthermore, the storage battery 4a having a smaller size than that can be used. For example, as shown in FIG. 9, in the light rechargeable secondary battery of the present invention having a single outer shape,
AA storage battery 4 is loaded. In addition,
As shown in, for example, when the storage battery 4a having a AAA shape is loaded and used, the auxiliary battery 15 can be used to fix the storage battery 4a and obtain electrical conduction. The auxiliary tool 15 is, for example, an elastic portion 15a for fixing the side peripheral surface.
And the end face fixing elastic portion 15c and the conductive end face fixing elastic portion base material portion 15b. In the present invention, it is a necessary condition to obtain electrical continuity from the end of the storage battery 4a to the light rechargeable secondary battery by the elastic portion 15c for fixing the end surface, but of course,
The auxiliary tool 15 can be made of an integral conductive material (for example, a copper plate, an iron plate, etc.). Further, the elastic portion 15a for fixing the side peripheral surface may be made of an insulating material, for example, a polymer material. With such a configuration, instead of the storage battery 4 having a specific shape, a storage battery 4a having a smaller shape can be further fixed and electrical conduction can be obtained. The shape may be any shape without impairing the object of the present invention.

The photo-chargeable secondary battery according to the present invention is
As described above, the photoelectric conversion sheet 3 is not limited to the configuration in which one side, which is the innermost peripheral side, is connected and fixed to the winding core 2. It may be detachable from the battery 1. As a result, the photo-chargeable secondary battery 1 can be used by replacing it with a normal photoelectric conversion sheet 3 when the photoelectric conversion sheet 3 is physically or electrically damaged. That is, the light rechargeable secondary battery according to the present invention may have a configuration in which the photoelectric conversion sheet 3 is electrically connected to the storage battery 4 at least during charging.

[0041]

EFFECTS OF THE INVENTION The photo-chargeable secondary battery according to the present invention can be used as a storage battery having a plurality of shapes, so that the versatility can be expanded and the practicality can be improved. Therefore, according to the photo-chargeable secondary battery according to the present invention, it becomes practical to use light energy such as sunlight as a power source for electric devices, and it is possible to prevent environmental pollution due to generation of harmful emissions. In addition to being able to do so, it is possible to effectively use earth resources.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a photo-chargeable secondary battery of the present invention.

FIG. 2 is a schematic perspective view of a photo-chargeable secondary battery in a state where a photoelectric conversion sheet carrying a photoelectric conversion element is partially pulled out.

FIG. 3 is a schematic view of a photoelectric conversion sheet in a state of being stretched from a winding core portion.

4 is a cross-sectional view taken along the line AA ′ of FIG.

FIG. 5 is a vertical cross-sectional view of a light rechargeable secondary battery having upper and lower flanges provided with grooves so that side edges of the outer peripheral wall are rotatably fitted.

6 is a cross-sectional view of FIG.

FIG. 7 is a perspective view of the photo-chargeable secondary battery in a state where a photoelectric conversion sheet carrying a photoelectric conversion element is partially pulled out.

8 is a cross-sectional view of FIG.

FIG. 9 is a vertical cross-sectional view of a photo-chargeable secondary battery according to the present invention when an AA battery is used as a rechargeable battery.

FIG. 10 is a vertical cross-sectional view of a photo-chargeable secondary battery according to the present invention in which an AAA battery is used as a rechargeable battery by using a holding means.

FIG. 11 is a perspective view showing one aspect of a storage battery holding means according to the present invention.

[Explanation of symbols]

1 Light rechargeable secondary battery 2 winding core 3 photoelectric conversion sheet 4 storage battery 4a storage battery 5 Control circuit section 6 Upper flange 6a groove 7 Lower flange 7a groove 8 Positive terminal 9 Negative electrode terminal 10 sheet substrate 11 Photoelectric conversion element 11a main surface 12 electrode layers 12a positive electrode terminal 13 Photoelectric conversion layer 14 electrode layers 14a Negative electrode terminal 15 Auxiliary equipment 15a Elastic part for fixing side peripheral surface 15b Conductive end face fixing elastic base member 15c Elastic part for fixing the end face 31 Seat 51 Outer wall 51a slit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koichiro Hikuma             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Tomiichi Watanabe             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Hiroshi Miyazawa             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation F-term (reference) 5F051 AA05 AA12 DA03 DA04 FA02                       FA06 GA05 JA17                 5G003 AA06 BA01 FA03                 5H030 AA06 AS20 BB07 DD04

Claims (10)

[Claims] 1. A cylindrical winding core, a flexible photoelectric conversion element wound around the winding core and arranged so as to be drawn out, a rechargeable storage battery, and this storage battery. And a control circuit part for controlling the charge and discharge of the photoelectric conversion element is wound around the winding core portion, in a rechargeable secondary battery having a substantially cylindrical overall shape, wherein the storage battery is the winding core. A photo-chargeable secondary battery, which is detachable from a unit and which can be used as an alternative to two or more types of storage batteries different in size. 2. The light rechargeable secondary battery according to claim 1, wherein a predetermined cylindrical battery standard shape is formed in a state where the photoelectric conversion element is wound around the winding core. 3. The storage battery has a discharge voltage of 0.6 to 1.9.
The photo-chargeable secondary battery according to claim 1, wherein the photo-chargeable secondary battery is V. 4. The light rechargeable secondary battery according to claim 2, wherein the cylindrical battery standard is AA, AA or AA. 5. The photo-chargeable secondary battery according to claim 1, wherein the storage battery has a predetermined cylindrical battery standard shape. 6. The photo-chargeable secondary battery according to claim 5, wherein the cylindrical battery standard of the storage battery is AA, AAA, AAA or button type. 7. The light rechargeable secondary battery according to claim 1, wherein a holding means is used in a winding core of the storage battery when the storage battery having a small shape is used. 8. The photo-chargeable secondary battery according to claim 7, wherein the holding means of the storage battery is held by elastic force. 9. The photo-chargeable secondary battery according to claim 7, wherein the holding means of the small-sized storage battery is made of a conductive material. 10. An electric device using a light rechargeable secondary battery.