Secondary battery and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2017317374-A1
Application number	US-201515522413-A
Country	US
Kind code	A1
Filing date	Oct 26, 2015
Priority date	Nov 7, 2014
Publication date	Nov 2, 2017
Grant date	—

Abstract

To provide a secondary battery that can be mounted on a substrate and can easily select a voltage to be output in manufacture and a manufacturing method thereof. A secondary battery in which small cells with substantially the same form are stacked and whose voltage to be output is easily selected in manufacture by changing the number of stacked layers is manufactured. In the cell, an electrolytic solution including a spacer and a polymer is used to keep at least a certain distance between the positive electrode active material layer and the negative electrode active material layer with the spacer. Furthermore, the electrolytic solution is made to gelate by the polymer to be an electrolytic solution that can be formed in the form of a sheet. Furthermore, the positive electrode active material layer and the negative electrode active material layer are formed using a printing method typified by screen printing.

First claim

1 - 7 . (canceled)

8 . A secondary battery comprising:
a first current collector; a first active material layer in contact with the first current collector; a second current collector; a second active material layer in contact with the second current collector; a first layer; and an exterior body, wherein the exterior body covers the first current collector, the first active material layer, the second current collector, the second active material layer, and the first layer, wherein the first layer includes a first spacer, a second spacer, a first polymer and a first electrolyte, wherein one of the first active material layer and the second active material layer is a positive electrode active material layer, and the other of the first active material layer and the second active material layer is a negative electrode active material layer, wherein the first spacer is in contact with the first active material layer and the second active material layer, and wherein the second spacer is in contact with a side surface of the second active material layer.

9 . The secondary battery according to claim 8 , wherein the first spacer and the second spacer are particles including aluminum oxide.

10 . The secondary battery according to claim 8 ,
wherein the first layer further comprises a first solvent, wherein the first polymer includes PVDF, wherein the first electrolyte includes Li(SO 2 F) 2 N, and wherein the first solvent includes ethylene carbonate and propylene carbonate.

11 . A secondary battery comprising:
a first cell comprising:
a first current collector;
a first active material layer in contact with the first current collector;
a second current collector;
a second active material layer in contact with the second current collector; and
a first layer;
a second cell comprising:
a third current collector;
a third active material layer in contact with the third current collector;
a fourth current collector;
a fourth active material layer in contact with the fourth current collector; and
a second layer; and
an exterior body, wherein the exterior body covers the first cell and the second cell, wherein the first cell and the second cell are electrically connected in series, wherein the first layer includes a first spacer, a second spacer, a first polymer and a first electrolyte, wherein the second layer includes a third spacer, a fourth spacer, a second polymer and a second electrolyte, wherein one of the first active material layer and the second active material layer is a positive electrode active material layer, and the other of the first active material layer and the second active material layer is a negative electrode active material layer, wherein one of the third active material layer and the fourth active material layer is a positive electrode active material layer, and the other of the third active material layer and the fourth active material layer is a negative electrode active material layer, wherein the first spacer is in contact with the first active material layer and the second active material layer, wherein the second spacer is in contact with a side surface of the second active material layer, wherein the third spacer is in contact with the third active material layer and the fourth active material layer, and wherein the fourth spacer is in contact with a side surface of the fourth active material layer.

12 . The secondary battery according to claim 11 , wherein the first spacer, the second spacer, the third spacer and the fourth spacer are particles including aluminum oxide.

13 . The secondary battery according to claim 11 ,
wherein the second layer further comprises a second solvent, wherein the second polymer includes PVDF, wherein the second electrolyte includes Li(SO 2 F) 2 N, and wherein the second solvent includes ethylene carbonate and propylene carbonate.

14 . A method for manufacturing a secondary battery, comprising:
forming a first active material layer and a second active material layer over a first current collector; forming a third active material layer and a fourth active material layer over a second current collector; positioning a first layer including a first spacer and a second spacer over the first current collector such that the first active material layer and the second active material layer are in contact with the first layer; positioning the second current collector over the first layer such that the first layer is in contact with the third active material layer and the fourth active material layer, the first active material layer and the third active material layer overlap with each other, and the second active material layer and the fourth active material layer overlap with each other; heating and pressurizing the first current collector, the first active material layer, the second active material layer, the first layer, the third active material layer, the fourth active material layer, and the second current collector; injecting an insulator whose fluidity is increased by heating into a region between the first current collector and the second current collector; cutting the first current collector, the second current collector, the first layer, and the insulator so as to form a first cell comprising the first active material layer and the third active material layer, and a second cell comprising the second active material layer and the fourth active material layer.

15 . The method for manufacturing a secondary battery according to claim 14 ,
wherein the first layer includes a polymer, and wherein the first layer comprises a portion of a sheet-like gel.

16 . The method for manufacturing a secondary battery according to claim 14 , wherein the first spacer and the second spacer are particles including aluminum oxide.

17 . The method for manufacturing a secondary battery according to claim 14 ,
wherein the first layer further comprises a first polymer, a first electrolyte and a first solvent, wherein the first polymer includes PVDF, wherein the first electrolyte includes Li(SO 2 F) 2 N, and wherein the first solvent includes ethylene carbonate and propylene carbonate.

18 . The method for manufacturing a secondary battery according to claim 14 , wherein the first active material layer and the second active material layer are positive electrode active material layers, and the third active material layer and the fourth active material layer are negative electrode active material layers.

19 . The method for manufacturing a secondary battery according to claim 14 , further comprising:
electrically connecting the first cell and the second cell in series; and covering the first cell and the second cell with an exterior body.

20 . The method for manufacturing a secondary battery according to claim 14 ,
wherein the first spacer is in contact with the first active material layer and the third active material layer, wherein the second spacer is in contact with a side surface of the first active material layer.

Assignees

• Semiconductor Energy Lab

Inventors

• Takahashi Minoru

Classifications

• H01G11/56

  Solid electrolytes, e.g. gels; Additives therein · CPC title

• H01G11/78

  Cases; Housings; Encapsulations; Mountings · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01G11/82

  Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations · CPC title

• H01M10/0568

  characterised by the solutes · CPC title