POWER STORAGE DEVICE AND MANUFACTURING METHOD THEREFOR

• US 20130122347A1
• Filed: 12/28/2012
• Published: 05/16/2013
• Est. Priority Date: 06/28/2010
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Horikawa, Keiji, Ehara, Yukio, Itaya, Masaharu, Fukuda, Yasutake, Sawada, Manabu, Harada, Hiroyuki, Ueba, Yuusuke, Ueda, Yasuhiko
• Granted Patent: US 9,368,776 B2
• Time in Patent Office: Days
• US Class Current: 429/144
• CPC Class Codes: H01G 11/12 Stacked hybrid or EDL capacitors
• CPC Class Codes: H01G 11/52 Separators
• CPC Class Codes: H01G 11/74 Terminals, e.g. extensions of current collectors
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/0414 by screen printing
• CPC Class Codes: H01M 50/449 having a layered structure
• CPC Class Codes: H01M 50/489 Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
• CPC Class Codes: H01M 50/545 formed by the casing of the cells cup shaped terminals adapted for cells having curved cross-section H01M50/56
• CPC Class Codes: H01M 6/005 Devices for making primary cells
• CPC Class Codes: H01M 6/40 Printed batteries , e.g. thin film batteries
• CPC Class Codes: H01M 6/46 of flat cells
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49108 Electric battery cell making
• CPC Class Codes: Y10T 29/49114 including adhesively bonding

Abstract

A power storage device having: a laminated body formed by providing a separator layer between a first electrode which is one of a cathode and an anode and a second electrode which is the other electrode; an electrolyte; and a package which houses the laminated body and the electrolyte. At least two first electrode composite sheets are included which are each obtained by integrating a first collector electrode, a first electrode active material layer provided on one principal surface of the first collector electrode, and a separator layer covering at least part of the one principal surface, and the other principal surface of the first collector electrode of one first electrode composite sheet out of the at least two first electrode composite sheets is opposed to, and bonded to, the other principal surface of the first collector electrode of the other first electrode composite sheet.

Claims

1. A power storage device, comprising:

a laminated body having a first electrode and a second electrode;

an electrolyte; and

a package which houses the laminated body and the electrolyte,

wherein at least one of the first electrode and the second electrode include at least two first electrode composite sheets, each of the at least two first electrode composite sheets including a first collector electrode, a first electrode active material layer on a first surface of the first collector electrode, and a first separator layer covering at least part of the first surface of the first collector electrode, and

wherein, of the at least two first electrode composite sheets, the respective first surfaces of each of the first collector electrodes are opposed to, and bonded to, each other.

2. The power storage device according to claim 1, wherein the at least one of the first electrode and the second electrode further include a second electrode composite sheet comprising a second collector electrode, a second electrode active material layer on a second surface of the second collector electrode, and a second separator layer covering at least part of the second surface of the second collector electrode.

3. The power storage device according to claim 1, wherein the at least one of the first electrode and the second electrode further include at least two second electrode composite sheets each comprising a second collector electrode, a second electrode active material layer on a second surface of the second collector electrode, and a second separator layer covering at least part of the second surface of the second collector electrode, wherein

of the at least two second electrode composite sheets, the respective second surfaces of each of the second collector electrodes are opposed to, and bonded to, each other.

4. The power storage device according to claim 2, wherein one of the first separator layers of the two first electrode composite sheets and the second separator layer of the second electrode composite sheet are bonded to each other.

5. The power storage device according to claim 3, wherein the one of the first separator layers of the two first electrode composite sheets and one of the second separator layers of one of the two second electrode composite sheets are bonded to each other.

6. The power storage device according to claim 1, wherein the separator layer contains an inorganic filler.

7. A manufacturing method for a power storage device, the method comprising:

preparing at least two first electrode composite sheets by integrating a first collector electrode, a first electrode active material layer on a first surface of the first collector electrode, and a first separator layer covering at least part of the first surface of the first collector electrode;

bonding the at least two first electrode composite sheets to each other such that respective first surfaces of the first collector electrodes of each of the two first electrode composite sheets are opposed to, and bonded to, each other;

preparing at least one of a first electrode and a second electrode containing the at least two first composite sheets;

forming a laminated body containing an anode and a cathode, wherein one of the anode and the cathode is the at least one of the first electrode and the second electrode containing the at least two first composite sheets; and

preparing a package which houses the laminated body and an electrolyte.

8. The manufacturing method for a power storage device according to claim 7, wherein

the two first electrode composite sheets are prepared by:

forming the first collector electrode on a substrate;

forming the first electrode active material layer on the first surface of the first collector electrode;

forming the separator layer covering at least part of the first surface; and

peeling the substrate from the first collector electrode before the at least two first electrode composite sheets are bonded to each other.

9. The manufacturing method for a power storage device according to claim 7, further comprising:

producing second electrode composite sheets each obtained by integrating a second collector electrode, a second electrode active material layer on principal second surface of the second collector electrode, and a separator layer covering at least part of the second surface of the second collector electrode; and

bonding the first separator layer of one of the first two electrode composite sheets and the second separator layer of the second electrode composite sheet to each other.

10. The manufacturing method for a power storage device according to claim 7, further comprising:

producing at least two second electrode composite sheets each obtained by integrating a second collector electrode, a second electrode active material layer on a second surface of the second collector electrode, and a second separator layer covering at least part of the second surface of the second collector electrode;

bonding the two second electrode composite sheets to each other such that the respective second surfaces of the second collector electrodes of each of the two second electrode composite sheets are opposed to, and bonded to, each other; and

bonding the first separator layer of one of the two first electrode composite sheets and the second separator layer of one of the two second electrode composite sheet to each other.

11. The manufacturing method for a power storage device according to claim 9, wherein the step of bonding the first separator layer of the one of the first two electrode composite sheets and the second separator layer of the second electrode composite sheet to each other is carried out before the step of bonding the two first electrode composite sheets to each other.

12. The manufacturing method for a power storage device according to claim 9, wherein the step of bonding the first separator layer of the one of the first two electrode composite sheets and the second separator layer of the second electrode composite sheet to each other is carried out before the step of bonding the two second electrode composite sheets to each other.

13. The manufacturing method for a power storage device according to claim 9, wherein the step of bonding the first separator layer of the one of the first two electrode composite sheets and the second separator layer of the second electrode composite sheet to each other is carried out before the step of bonding the two first electrode composite sheets to each other and the step of bonding the two second electrode composite sheets to each other.

14. The manufacturing method for a power storage device according to claim 10, wherein the step of bonding the first separator layer of the one of the first two electrode composite sheets and the second separator layer of the second electrode composite sheet to each other is carried out before the step of bonding the two first electrode composite sheets to each other.

15. The manufacturing method for a power storage device according to claim 10, wherein the step of bonding the first separator layer of the one of the first two electrode composite sheets and the second separator layer of the second electrode composite sheet to each other is carried out before the step of bonding the two second electrode composite sheets to each other.

16. The manufacturing method for a power storage device according to claim 10, wherein the step of bonding the first separator layer of the one of the first two electrode composite sheets and the second separator layer of the second electrode composite sheet to each other is carried out before the step of bonding the two first electrode composite sheets to each other and the step of bonding the two second electrode composite sheets to each other.

17. The manufacturing method for a power storage device according to claim 9, wherein each of the second electrode composite sheets are prepared by:

forming the second collector electrode on a substrate;

forming the second electrode active material layer on the second surface of the second collector electrode;

forming the separator layer covering at least part of the second surface of the second collector electrode; and

peeling the substrate from the second collector electrode.

18. The manufacturing method for a power storage device according to claim 10, wherein each of the at least two second electrode composite sheets are prepared by:

forming the second collector electrode on a substrate;

forming the second electrode active material layer on the second surface of the second collector electrode;

forming the separator layer covering at least part of the second surface of the second collector electrode; and

peeling the substrate from the second collector electrode.

19. The manufacturing method for a power storage device according to claim 7, wherein the first separator layer contains an inorganic filler.