Stacked-type secondary battery

Patent metadata

Field	Value
Publication number	US-9865859-B2
Application number	US-201414781444-A
Country	US
Kind code	B2
Filing date	Apr 3, 2014
Priority date	Mar 26, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A structure with suppressed thickness and high-density when battery cells of a thin-film-solid secondary battery are stacked. Adjacent battery cells are stacked such that negative electrodes are in contact with each other and positive electrodes are in contact with each other, and arranged such that a taking-out lead electrode smaller than negative or positive electrode surfaces are sandwiched between two negative electrodes in contact with each other or two positive electrodes in contact with each other, and the lead electrodes sandwiched between electrodes of different layers are arranged such that there is no region where all of the lead electrodes simultaneously overlap one another as viewed in a planar arrangement. There are a strip-shaped lead electrode and a linear lead electrode. Further, a conductive sheet forming the electrode is extended to also serve as the taking-out electrode, thereby making it possible to reduce the number of lead electrodes.

First claim

What is claimed is:

1. A stacked-type secondary battery made by stacking a plurality of battery cells each in a planar shape having a charge layer that stores electricity sandwiched between a negative electrode and a positive electrode,
wherein adjacent battery cells are stacked such that negative electrodes thereof are in contact with each other and positive electrodes thereof are in contact with each other,
wherein a taking-out lead electrode that is smaller than a negative electrode surface or a positive electrode surface is sandwiched at least either between two negative electrodes in contact with each other or between two positive electrodes in contact with each other, and
wherein lead electrodes sandwiched between electrodes of different layers are arranged such that there is no region where all of the lead electrodes simultaneously overlap one another as viewed from a surface where the lead electrode is taken out.

2. The stacked-type secondary battery according to claim 1 ,
wherein the lead electrode sandwiched between the electrodes comprises one lead electrode or a plurality of lead electrodes.

3. The stacked-type secondary battery according to claim 1 ,
wherein the lead electrode sandwiched between the electrodes is in a linear shape.

4. The stacked-type secondary battery according to claim 1 ,
wherein the lead electrode sandwiched between the electrodes is in a strip shape.

5. The stacked-type secondary battery according to claim 4 ,
wherein the strip-shaped lead electrode sandwiched between the electrodes gradually increases in width outward from a stacked part.

6. The stacked-type secondary battery according to claim 1 ,
wherein the lead electrode has a resistivity equal to or lower than resistivities of the positive electrode and the negative electrode in contact therewith.

7. The stacked-type secondary battery according to claim 6 ,
wherein the lead electrode is in a shape extended from a taking-out part to the outside of the battery cell to an end portion inside the electrode to concentrate current from the cathode and anode in contact therewith on the lead electrode.

8. The stacked-type secondary battery according to claim 4 ,
wherein the strip-shaped lead electrode is integrally configured such that a plurality of lead electrodes are provided in a comb shape from a common electrode part.

9. The stacked-type secondary battery according to claim 8 ,
wherein each of the lead electrodes provided in the comb shape is sandwiched between two negative electrodes in contact with each other when the lead electrode is used as a taking-out electrode for anode, and is sandwiched between two positive electrodes in contact with each other when the lead electrode is used as a taking-out electrode for cathode, and the lead electrodes for cathode and for anode are arranged not to simultaneously overlap one another.

10. The stacked-type secondary battery according to claim 8 ,
wherein the number of the lead electrodes provided in the comb shape is larger than the number of spaces between the electrodes to be required, and a plurality of the lead electrodes are arranged between the same electrodes.

11. The stacked-type secondary battery according to claim 1 ,
wherein the lead electrode is provided with an insulating layer for preventing short circuit near an end portion of the battery cell.

12. The stacked-type secondary battery according to claim 1 ,
wherein the charge layer of the battery cell that is a unit to be stacked as the stacked-type secondary battery, a part of the electrode in contact with the lead electrode that is in contact with the lead electrode of another electrode, and a side surface part are covered by an insulating layer.

13. The stacked-type secondary battery according to claim 1 ,
wherein taking-out by the lead electrode is performed only for one of the cathode and the anode, and
wherein the other of the negative electrode and the positive electrode is extended from a charge layer region to overlap as the taking-out electrode.

14. The stacked-type secondary battery according to claim 1 ,
wherein the battery cell that is a unit to be stacked as the stacked-type secondary battery is formed such that a charge layer is formed in a region smaller than the positive electrode or the negative electrode on the positive electrode or the negative electrode, and a positive electrode or a negative electrode corresponding to the positive electrode or the negative electrode is formed in a region smaller than the charge layer,
wherein the battery cells are superposed one on the other such that the positive electrodes or the negative electrodes are in contact with each other, and
wherein the positive electrode or the negative electrode surrounded by the charge layer is taken out to the outside by the lead electrode.

15. The stacked-type secondary battery according to claim 13 ,
wherein the lead electrode is arranged to be taken out to the outside from the positive electrode or the negative electrode surrounded by the charge layer, and a portion in contact with the charge layer and one of the electrodes is coated with an insulating layer.

16. The stacked-type secondary battery according to claim 13 ,
wherein the lead electrode is arranged to be taken out to the outside from the positive electrode or the negative electrode surrounded by the charge layer, and an insulating layer is provided at least in a region of the charge layer and the one of electrode parts in contact with the lead electrode.

17. The stacked-type secondary battery according to claim 1 ,
wherein the lead electrodes from electrode contact parts of a plurality of the stacked-type secondary batteries are made common thereto.

18. The stacked-type secondary battery according to claim 16 ,
wherein one of the positive electrode and the negative electrode is extended from the charge layer region to form a taking-out electrode, a lead electrode that electrically couples the plurality of stacked-type secondary batteries is arranged, and
wherein the lead electrodes from electrode contact parts of the plurality of stacked-type secondary batteries are made common as the other electrode.

19. The stacked-type secondary battery according to claim 17 ,
wherein the electrodes on both side surface of the stacked-type secondary battery are the same positive electrodes or the negative electrodes;
wherein one of the positive electrode and the negative electrode is extended from a charge layer region to form a taking-out electrode, and the electrode extended to form the taking-out electrode is not connected by the lead electrode between the plurality of stacked-type secondary batteries,
wherein the lead electrodes from the electrode contact parts of the plurality of stacked-type secondary batteries are made common as the other electrode, and
wherein after the plurality of stacked-type secondary batteries are assembled using the lead electrode in common, the plurality of stacked-type secondary batteries are superposed one on the other by folding the stacked-type secondary batteries like an accordion with the common lead electrode located outside the stacked-type secondary batteries as a fold.

Assignees

• Nihon Micronics Kk
• Guala Tech Co Ltd
• Guala Tech Co Ltd

Inventors

• Saitoh Tomokazu
• Izumo Shozo
• Inoue Tatsuo
• Nakazawa Akira

Classifications

• H01M10/0585 Primary

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M10/0436

  Small-sized flat cells or batteries for portable equipment · CPC title

• H01M50/534

  characterised by the material of the leads or tabs · CPC title