JPH0244778A - Optical power source - Google Patents

Abstract

PURPOSE:To implement a compact configuration and high energy density by laminating an optical power source part and a lithium secondary battey using lithium ion conducting type macromolecular electrolyte. CONSTITUTION:GaAs active layers 6, 9 and 12, GaAs light absorbing layers 5, 8 and 11 and AlGaAs window layers 4, 7 and 10 are repeatedly laminated in this order on a metal electrode 13. A transparent electrode 3, a metal electrode 2 and a transparent protecting film 1 are manufactured thereon. A lithium foil 14 is laminated on the rear surface of the metal electrode 13. A laminar V2O5 layer 16 is evaporated on a metal electrode 17 with a polymer electrolyte 15 in a vacuum state. Said element is sealed with a sealing resin 18. Thus a compact configuration and a high energy density are implemented.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an optical power source.

Conventional Technologies and Their Problems In recent years, the development of photoelectric conversion elements that convert light such as sunlight and lighting into electricity has progressed, and demand is increasing for a wide range of applications ranging from electric power to consumer devices such as calculators.

However, if a photoelectric conversion element is used, when the light decreases or disappears, the power supply inevitably decreases or disappears, making it difficult to operate the device. In order to compensate for such drawbacks, various methods have been proposed and adopted in which a photoelectric conversion element is combined with a rechargeable secondary battery or a capacitor. However, along with the miniaturization of devices, the demand for miniaturization of power supply members has also increased, and there is a need for power supply elements with high energy density that can be directly incorporated into device circuits. For example, the ICs often used in current equipment are 2
A voltage higher than V is required, and a power supply lower than this is DC.
- Requires a DC converter or series connection of multiple power supplies,
Currently, due to the complexity of wiring, etc., the intended purpose of miniaturization and simplification cannot be achieved. Furthermore, devices using liquid electrolytes have a risk of circuit damage due to liquid leakage, and have poor reliability.

The present invention overcomes these problems and provides a power supply element that is small and capable of providing stable output with high energy density.

Means for solving the problem, that is, the present invention provides an optical power source unit formed by stacking or connecting in series a plurality of photoelectric conversion elements that generate electric power by light irradiation, or connecting the stacked elements in series; The present invention relates to an optical power source in which a lithium secondary battery section using a lithium ion conductive polymer electrolyte is stacked, and the optical power source section and one of the same poles of the lithium secondary battery section are electrically connected.

As the photoelectric conversion element used in the present invention, a wide variety of conventionally known ones can be used, such as amorphous silicon, polycrystalline silicon, single crystal silicon, amorphous silicon germanium, gallium arsenide, etc. It can be produced by a conventional method.

In addition, as a positive electrode material for the lithium secondary battery section, for example, T
i S2 , MnO2, Mn S2 , amorphous V2O5, layered V2O5, amorphous Cr205,
Rich0 such as L t Mu20 (3,5,,,4)
．． 5. Materials that can occlude Lam ions can be listed, and among these, layered V2O5 is preferred. Examples of the negative electrode material include metal lithium, lithium aluminum alloy, and other substances that can generate lithium ions. A preferred example of the lithium ion conductive polymer electrolyte is a polyphosphazene electrolyte. As a polyphosphazene electrolyte, LiCQ04. LiBF4. LiAsF6゜L
A compound of a lithium salt such as iPF6 CF3 SO3Lt can be used, especially the following formula (I) having an oligoethyleneoxy group in the side chain.

Oligoethyleneoxypolyphosphthyzene in which segments represented by (n), (III), (IV), or (V) are arbitrarily arranged, or a polymer electrolyte in which the above-mentioned lithium salt is complexed with the oligoethylene oxypolyphosphthyzene, has a charging voltage of can be applied between 5V (35V for a short time), so it can be suitably used.

0(C112CH20)kM [In the above formulas (I) to (V), R and R' each represent a lower alkyl group. h and k mean the average repeating number of ethyleneoxy units, and are real numbers in the range of 0≦h≦15, and 0≦≦15. Further, Q, m, and n are each integers, and satisfy 3≦Q+m+n≦200000. ] In the optical power source of the present invention, it is preferable that one of the same poles of the optical power source section and the lithium secondary battery section is electrically connected, and the other is connected via a backflow prevention diode.

In addition, in the optical power source of the present invention, in order to further reduce the size and make it a single element, the optical power source section, the backflow prevention diode, and the lithium secondary battery section are stacked, and the optical power source section and the lithium secondary battery section are stacked. It is desirable that one of the same poles of the two be electrically connected.

Furthermore, in the present invention, the lithium secondary battery part is 3V class,
Considering that the voltage is normally used at 2 V or more and the voltage drop caused by the diode, it is desirable to stack or connect a plurality of photoelectric conversion elements in series so that the output voltage of the optical power source section is 2.3 V or more.

Effects of the Invention The power supply element of the present invention is an optical power supply that can generate a desired voltage by laminating, serially, or arranging a plurality of laminated elements in series, each of which has a plurality of photoelectric conversion elements that generate electric power through light irradiation. A flexible 3V class all-solid-state lithium secondary battery part that can follow the output fluctuations of photoelectric conversion elements and does not leak, using a lithium ion conductive polymer electrolyte that can be charged and discharged over a wide range. It can be laminated and integrated, and can be mounted in electrical and electronic circuits by electrically connecting only one of the same poles of both parts, which simplifies the wiring between each element and increases the By using an all-solid-state lithium battery with a high energy density, not only the power storage unit is made smaller, but a DC-DC converter is no longer necessary in a normal circuit, making it possible to further reduce the size and use a single element. Further, by stacking the flexible optical power source section and the present secondary battery section, an all-solid-state flexible optical power source element can be obtained.

Example Examples are given below to further clarify the present invention.

Example 1 The charging source element of this example is shown in FIG.

10ma+X 10mm, 40μm thick metal electrode (1
3) From (12) to (
4) Heto AC! GaAs active layer, GaAs light absorption layer, A
A QGaAs window layer is repeatedly laminated in this order, and a transparent electrode (3), a metal electrode (2), and a transparent protective film (1) are formed thereon.

Lithium foil (1, 4) is laminated on the back side of this metal electrode (13), and a layered V'205 layer (16) separately prepared by applying and drying on top of the metal electrode (17) is applied to the polymer electrolyte (17).
15) to make a vacuum seal.

This element is sealed with a sealing resin (18).

The polymer electrolyte (15) used here has the structural formula (I
), (II) and (m) are arbitrarily arranged and have an average molecular weight of about 800,000 (for example, a polyphosphazene with an average molecular weight of about 800,000
Polymer described in Example 6 of No. 10739)
It is a 10% composite of CQ○4.

The thus prepared chip was incorporated into a circuit with a load of 201 (Ω) as shown in Figure 4, and the voltage and current during the day and night were measured.
The operating state at 500 lux (6 o'clock to 18 o'clock) is shown in Fig. 5.

Example 2 The charging source element of this example is shown in FIG.

A metal substrate of 10 mm x 20 mm and 40 μm thick (34
) A metal electrode (33) insulated with a sealing material is formed on the top surface, and n-, i-, and p-type amorphous silicon layers are sequentially formed on the top surface from (32) to (24) by plasma CVD. They are laminated, and a transparent electrode (2B), a metal electrode (22), and a transparent protective film (21) are formed thereon.

A thin all-solid-state lithium secondary battery is laminated on the back surface of this metal substrate (34) in the same manner as in Example 1, and a chip is fabricated using a sealing material (18).

This was tested in the same manner as in Example 1, and the results shown in FIG. 6 were obtained.

Example 3 The charging source element of this example is shown in FIG.

Using an 80mm x 40n+m metal substrate, fabricate an optical power source section with 6 cells in series on the same plane using the same procedure as in Example 2, and stack and seal the secondary battery section in the same manner as in Example 1 to fabricate an element. .

This was tested in the same manner as in Example 1, and the results shown in FIG. 7 were obtained.

In all of the three examples above, an output of around 3V could be maintained, and the matching between the element and the circuit was also good.

Note that circuits of 3V class or higher can be easily accommodated by increasing the number of cells in series and stacking secondary batteries. For example, the secondary battery section shown in FIGS. 2 and 3 is changed to the one shown in FIG.

Example 4 The optical power source of this example has diodes stacked on the outer surface of one electrode plate of a lithium battery in a discharge prevention direction, and a plurality of photoelectric conversion elements that generate an electromotive force opposite to that of the battery when irradiated with light on top of the diodes. The optical power source section is composed of a plurality of optical power source sections connected in series, laminated or in series, and has a photovoltaic charging mechanism in which the poles of the optical power source section and the lithium battery section that are not in contact with the diode are electrically connected. This is as shown in Figure 9.

A backflow prevention diode (53), an insulating layer (48) and a metal electrode (46) on a metal substrate (47) of 80mm x 40mm.
was formed, and an element was produced thereon in the same manner as in Example 3.

This was connected to a circuit having a voltmeter, an ammeter, and a resistor as shown in FIG.
Results similar to those shown in the figure were obtained.

Also, unlike the three examples above, this element can be charged with only the element shown in Figure 9 (without the accompanying circuits as shown in Figures 4 and 10), so it is not necessary to replace it by removing it from the device and charging it. It can also be used as an auxiliary battery.

Furthermore, when the stacking order of the photoelectric conversion elements is reversed to pin, the stacking direction of the secondary battery and the direction of the backflow prevention diode may be reversed, and the invention is not limited to this embodiment.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the charging source element obtained in Example 1. FIG. 2 is a longitudinal cross-sectional view of the charging source element obtained in Example 2. FIG. 3 is a longitudinal cross-sectional view of the charging source element obtained in Example 3. FIG. 4 is a circuit diagram showing an example of how the charging source element obtained in Example 1 is used. FIG. 5 is a graph showing temporal changes in voltage and current regarding optical power blocking obtained in Example 1. FIG. 6 is a graph showing temporal changes in voltage and current regarding optical power blocking obtained in Example 2. FIG. 7 is a graph showing temporal changes in voltage and current regarding optical power blocking obtained in Example 3. FIG. 8 is a partially enlarged view of the secondary battery section of the charging source element of the present invention. FIG. 9 is a longitudinal cross-sectional view of the charging source element obtained in Example 4. FIG. 10 is a circuit diagram showing an example of how the charging source element obtained in Example 4 is used. (1)...Transparent protective film, (2)...Metal electrode (3)
...Transparent electrode, (4), (7), (10)-AQ GaAs window layer (5
), (8), (11) ...GaAs light absorption layer (
6), (9), (12) ・・AQ GaAs active layer (
13)...Metal electrode, (14)...Lithium foil (1
5)...Polymer electrolyte (1B)...Layered V2O5, (17)...Metal electrode (18)...Sealing resin (21)...Transparent protective film, (22), (33) ...
Metal electrode (23)...transparent electrode, (24), (27), (30)...p-type amorphous silicon layer (25), (28), (3
1)...i-type amorphous silicon layer (27),
(29), (32)...N-type amorphous silicon layer (34), (47)...Metal substrate (41)...Transparent sealing material, (42)...Transparent electrode
...p-type amorphous silicon layer...i-type amorphous silicon layer...n-type amorphous silicon layer...metal electrode, (48)...insulating sealing material...negative electrode, (50)... Electrolyte...Positive electrode, (52)...Metal electrode (and above) No. 10 Fig. Time (II) Fig. Time (hour) Fig. 7 Time j (Haru → Patent Office Commissioner Yoshi 1) Moon Takeshi incident Indication of 1986 Patent Application No. 19541, Title of Invention Optical Power Supply

Claims (6)

[Claims] (1) A photovoltaic power source section consisting of a plurality of photoelectric conversion elements that generate electric power through light irradiation are stacked, connected in series, or stacked in series, and a lithium ion conductive polymer electrolyte is used. An optical power source in which a lithium secondary battery section is stacked, and one of the same poles of the optical power source section and the lithium secondary battery section is electrically connected. (2) The optical power source according to claim 1, wherein one of the optical power source section and the lithium secondary battery section of the same polarity is electrically connected, and the other is connected via a backflow prevention diode. (3) The optical power source according to claim 1, wherein the optical power source section, the backflow prevention diode, and the lithium secondary battery section are stacked, and one of the same poles of the optical power source section and the lithium secondary battery section are electrically connected. . (4) Claim 1, wherein a plurality of photoelectric conversion elements are stacked or connected in series so that the output voltage of the optical power source is 2.3V or more.
4. The optical power source according to any one of 3 to 3. (5) V_2O_5 positive electrode in which the lithium secondary battery part is layered;
The optical power source according to any one of claims (1) to (3), which is a secondary battery comprising a lithium metal or lithium-aluminum alloy negative electrode and a polyphosphazene electrolyte. (6) The polyphosphazene electrolyte has the following formulas (I), (II)
), (III), (IV) or (V) in which the segments are arbitrarily arranged, or a combination thereof with a lithium salt. power supply. ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(II) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(III) ▲There are mathematical formulas, chemical formulas, tables, etc.▼( IV) ▲Mathematical formulas, chemical formulas, tables, etc.▼(V) [In the above formulas (I) to (V), R and R' each represent a lower alkyl group. h and k mean the average repeating number of ethyleneoxy units, 0≦h≦15, 0≦
It is a real number in the range k≦15. Furthermore, l, m, and n are each integers satisfying 3≦l+m+n≦200000. ]