Integrated thin film cell and fabrication method thereof

• US 20020092558A1
• Filed: 07/24/2001
• Published: 07/18/2002
• Est. Priority Date: 01/18/2001
• Status: Abandoned Application

• Current Assignee: Kwangju Institute Of Science And Technology
• Original Assignee: Kwangju Institute Of Science And Technology
• Inventors: Kim, Seong Bae, Kim, Woo Seong, Sung, Yung Eun, Chung, Kwang Il, Kim, Shin Kook
• Application Number:
  US09/910,776
• Publication Number:
  US 20020092558A1
• Time in Patent Office: Days
• US Class Current: 136/244
• CPC Class Codes: H01M 14/005 Photoelectrochemical storage cells light sensitive devices H01G9/20, semiconductors sensitive to light H01L31/00
• CPC Class Codes: H02S 40/38 Energy storage means, e.g. batteries, structurally associated with PV modules
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin

Abstract

An integrated thin film battery and fabrication method thereof is provided, in which a plurality of thin film batteries and thin film solar cells are formed in grooves formed on a substrate, to thereby secure stabilities of the thin film batteries and the thin film solar cells and provide a desired charging capacity and output voltage. The integrated thin film battery includes a substrate made of an electrical insulation material and whose one surface is etched to form a groove thereon; and a thin film battery including an anode, an electrolyte, a cathode, and anode and cathode current collectors respectively contacting the anode and cathode, for collecting current, which is formed on a groove formed on the substrate, for charging and discharging electrical energy.

Claims

1. An integrated thin film battery comprising:

a substrate made of an electrical insulation material and whose one surface is etched to form a groove thereon; and

a plurality of thin film batteries each including an anode, an electrolyte, a cathode, and anode and cathode current collectors respectively contacting the anode and cathode, for collecting current, which is formed on a groove formed on the substrate, for charging and discharging electrical energy.

2. The integrated thin film battery of claim 1, wherein the groove formed on the substrate is formed of a plurality of first grooves separated by insulation walls each made of an electrical insulation material.

3. The integrated thin film battery of claim 2, wherein the anode and cathode current collectors of a plurality of thin film batteries formed on the first groove are independently formed on each first groove.

4. The integrated thin film battery of claim 3, wherein the anode and cathode current collectors further comprises a plurality of connectors each made of a conductor in order to be connected with adjoining anode and cathode current collectors, respectively.

5. The integrated thin film battery of claim 2, wherein the anode and cathode current collectors are formed commonly contacting anodes and cathodes of a plurality of thin film batteries formed in a plurality of first grooves.

6. The integrated thin film battery of claim 1, wherein the groove formed on the substrate is formed of a plurality of second grooves separated up and down by insulation layers each made of an electrical insulation material.

7. The integrated thin film battery of claim 6, wherein a battery layer by a plurality of thin film batteries formed on one of the plurality of the second grooves and another battery layer by a plurality of thin film batteries formed on another of the plurality of the second grooves are connected to each other either in series or in parallel.

8. The integrated thin film battery of one of claims 1 to 7, further comprising a thin film solar cell formed on the uppermost layer of the groove formed on the substrate, for converting a solar energy into an electrical energy to be charged into the thin film battery.

9. An integrated thin film battery having a thin film solar cell comprising:

a substrate made of an electrical insulation material and whose one surface is etched to form a groove thereon;

a plurality of thin film batteries each including an anode, an electrolyte, a cathode, and anode and cathode current collectors respectively contacting the anode and cathode, for collecting current, which is formed on a groove formed on the substrate, for charging and discharging electrical energy; and

a plurality of thin film solar cells each formed on the uppermost layer of the groove formed on the substrate, for converting a solar energy into an electrical energy to be charged into the thin film battery.

10. An integrated thin film battery having a thin film solar cell comprising:

a substrate made of an electrical insulation material and whose one surface is etched to form a groove thereon;

a thin film battery including an anode, an electrolyte, a cathode, and anode and cathode current collectors respectively contacting the anode and cathode, for collecting current, which is formed on at least one of at least two grooves formed on the substrate, for charging and discharging electrical energy; and

a thin film solar cell formed on at least one groove of the grooves adjacent the groove in which the thin film battery is formed, for converting a solar energy into an electrical energy to be charged into the thin film battery.

11. A method for fabricating an integrated thin film battery having an enhanced stability, the integrated thin film battery fabrication method comprising the steps of:

(a) etching one surface of a substrate made of an electrical insulation material, to form a first groove capable of accommodating at least one battery layer formed of at least one thin film battery;

(b) forming a plurality of battery layers on the first groove, wherein step (b) comprising the sub-steps of

(b1) forming a first current collector connecting the first groove to either one electrode of the electrodes of a plurality of unit thin film batteries forming a battery layer,

(b2) depositing an insulation material on the first current collector, then etching the deposited result, and forming a plurality of second grooves each accommodating one unit thin film battery on each etched result,

(b3) depositing an anode, an electrolyte and a cathode which form a thin film battery on each second groove and forming a plurality of unit thin film batteries,

(b4) forming a second current collector on the plurality of unit thin film batteries by deposition, and

(b5) forming a plurality of battery layers each obtained by forming an insulation layer made of an insulation material on the second current collector by deposition;

(c) forming lead wires for connecting the first and second current collectors of respectively different battery layers among the plurality of battery layers; and

(d) forming a protective layer made of an insulation material on the plurality of battery layers.

12. The integrated thin film battery fabrication method of claim 11, wherein the first groove is formed in at least depth deeper than a total thickness of the plurality of battery layers formed therein.

13. The integrated thin film battery fabrication method of claim 11, wherein the second groove is formed in the same depth as a total thickness of the anode, the electrolyte and the cathode forming the unit thin film battery formed therein.

14. The integrated thin film battery fabrication method of claim 11, wherein the lead wires comprises a first lead wire formed so as to connect each first current collector among the plurality of battery layers, and a second lead wire formed so as to connect each second current collector, in which the lead wires connect the plurality of battery layers in parallel with each other.

15. The integrated thin film battery fabrication method of claim 11, wherein the lead wire connects the first and second current collectors in respectively adjoining battery layers among the plurality of battery layers, to thereby connect the plurality of battery layers in series with each other.

16. The integrated thin film battery fabrication method of claim 11, wherein in the case that the anode constituting the unit thin film battery is a transition metal oxide, the battery layer is formed in a single layer.

17. The integrated thin film battery fabrication method of claim 11, wherein in the case that the anode constituting the unit thin film battery is a vanadium oxide, the battery layer is formed in a multi-layer.

18. The integrated thin film battery fabrication method of claim 11, wherein the insulation layer and the protective layer are made of insulation materials, which include a buffering function and an electrical insulation characteristic with respect to the volume change upon the charging and discharging of the thin film battery.

19. The integrated thin film battery fabrication method of claim 11 or 18, wherein the protective layer is formed in combination of an electrical insulation material, metal and polymer, to thereby protect the insulation of the thin film battery from an external circumstance.

20. The integrated thin film battery fabrication method of claim 18, wherein the insulation material is made of one selected from the group consisting of SiO₂, TEOS, SOG, and a combination thereof.

21. The integrated thin film battery fabrication method of claim 11, wherein each current collector of the plurality of unit thin film batteries constituting the battery layer is formed as a single current collector with respect to each anode or each cathode, so that the anode and cathode share the current collector in common.

22. The integrated thin film battery fabrication method of claim 11, wherein each anode, electrolyte and cathode of the unit thin film battery constituting the battery layer are formed in the same material, time and thickness.

25. The integrated thin film battery fabrication method of claim 24, wherein the at least one thin film battery formed in step (b) is connected either in series or in parallel.

26. The integrated thin film battery fabrication method of claim 24, wherein the groove formed on the substrate is separately formed by an electrical insulation material.

28. The integrated thin film battery fabrication method of claim 27, wherein the second groove formed in step (b) is separately formed by an electrical insulation material.

29. The integrated thin film battery fabrication method of claim 27, wherein the at least one thin film battery formed in step (c) is connected either in series or in parallel.

23. A method for fabricating an integrated thin film battery having an enhanced stability, the integrated thin film battery fabrication method comprising the steps of:

(a) etching one surface of a substrate made of an electrical insulation material, to form a first groove capable of accommodating a plurality of battery layer formed of a plurality of thin film batteries;

(b) forming a first current collector connecting the first groove to either one electrode of the electrodes of a plurality of unit thin film batteries forming a battery layer;

(c) depositing an insulation material on the first current collector, then etching the deposited result, and forming a plurality of second grooves each accommodating one unit thin film battery on each etched result;

(d) depositing an anode, an electrolyte and a cathode which form a thin film battery on each second groove and forming a plurality of unit thin film batteries, to thereby form the plurality of unit thin film battery;

(e) forming a second current collector on the plurality of unit thin film batteries by deposition, and

(f) forming a protective layer made of an insulation material on the second current collector.

24. A method for fabricating an integrated thin film battery having a thin film solar cell, the integrated thin film battery fabrication method comprising the steps of:

(a) etching one surface of a substrate made of an electrical insulation material, to format least one groove;

(b) forming a thin film battery on at least one groove among the at least one groove and connecting the formed thin film batteries with each other; and

(c) forming a thin film solar cell on at least one groove among other grooves adjacent the thin film battery formed in step (b), to then connect the thin film battery and the thin film solar cell.

27. A method for fabricating an integrated thin film battery having a thin film solar cell, the integrated thin film battery fabrication method comprising the steps of:

(a) etching one surface of a substrate, to form a first groove accommodating a thin film solar cell;

(b) forming at least one second groove having a depth capable of accommodating at least one thin film battery;

(c) forming a thin film battery on the at least one second groove, and connecting the formed thin film batteries; and

(d) forming a thin film solar cell on the thin film battery formed in step (c).