POWER STORAGE DEVICE, AND METHOD FOR MANUFACTURING POWER STORAGE DEVICE

• US 20100035151A1
• Filed: 08/23/2007
• Published: 02/11/2010
• Est. Priority Date: 08/25/2006
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Takahashi, Izumi
• Granted Patent: US 8,232,004 B2
• Time in Patent Office: Days
• US Class Current: 429/210
• CPC Class Codes: H01G 9/008 Terminals
• CPC Class Codes: H01M 10/0418 with bipolar electrodes
• 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 50/54 Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
• CPC Class Codes: H01M 50/559 Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells H01M50/553 takes precedence
• CPC Class Codes: H01M 50/562 characterised by the material
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y10T 29/49108 Electric battery cell making
• CPC Class Codes: Y10T 29/4911 including sealing

Abstract

A power storage device has a stack including positive electrodes and negative electrodes that are stacked on top of each other with electrolytes interposed in-between. A positioning member is inserted into a positioning hole that is formed in the stack so as to penetrate the stack in the stacking direction. A terminal portion is formed at an end of the positioning member in the inserting direction.

Claims

1. A power storage device, comprising:

a stack having positive electrodes and negative electrodes stacked on top of each other with electrolytes interposed in-between and in which a positioning hole is formed, the positioning hole penetrating the stack in a stacking direction in which the positive electrodes, the negative electrodes, and the electrolytes are stacked;

a positioning member that is inserted into the positioning hole; and

a terminal portion that is formed at an end of the positioning member in an inserting direction in which the positioning member is inserted into the positioning hole, wherein

the terminal portion is provided with an electric wire that is connected to the positive electrode or the negative electrode of the stack.

2. The power storage device according to claim 1, wherein

the terminal portion is provided in plurality, which include a positive electrode terminal and a negative electrode terminal that are provided at both ends of the positioning member in the inserting direction, respectively.

3. The power storage device according to claim 1, wherein

the positioning member is made of an insulating material.

4. The power storage device according to claim 1, wherein

the positioning hole is formed at substantially the center of the stack as viewed in the stacking direction of the stack.

5. The power storage device according to claim 4, wherein

the positioning hole has a circular cross section.

6. The power storage device according to claim 4, wherein

the positioning hole has a polygonal cross section.

7. The power storage device according to claim 6, wherein

the positioning member has a polygonal cross section and edges of the positioning member are chamfered.

11. The power storage device according to claim 1, wherein

each of the electrolytes of the stack contains a binder.

12. The power storage device according to claim 1, wherein

the positive electrodes, the negative electrodes, and the electrolytes of the stack are coaxial with each other about the positioning member.

13. The power storage device according to claim 12, wherein

the diameter of the electrolyte is larger than the diameter of the positive electrode and the diameter of the negative electrode.

14. The power storage device according to claim 1, wherein

an insulating ring, which is a ring-shaped insulating member, is fit on the terminal portion of the positioning member, and

an exterior part of the power storage device is attached via the insulating ring.

8. (canceled)

9. The power storage device comprising:

a stack having positive electrodes and negative electrodes stacked on top of each other with electrolytes interposed in-between and in which a positioning hole is formed, the positioning hole penetrating the stack in a stacking direction in which the positive electrodes, the negative electrodes, and the electrolytes are stacked;

a positioning member that is inserted into the positioning hole; and

a terminal portion that is formed at an end of the positioning member in an inserting direction in which the positioning member is inserted into the positioning hole, wherein

the terminal portion is a conductive layer that covers the end of the positioning member in the inserting direction and extends to one of the positive electrode and the negative electrode that are provided at ends of the stack in the stacking direction such that a surface of the conductive layer contacts a surface of the one of the positive electrode and the negative electrode.

10. The power storage device according to claim 9, wherein

the stack and a portion of the conductive layer are sealed by an insulator.

20. The power storage device according to claim 9, wherein

the terminal portion is provided in plurality, which include a positive electrode terminal and a negative electrode terminal that are provided at both ends of the positioning member in the inserting direction, respectively.

21. The power storage device according to claim 9, wherein

the positioning member is made of an insulating material.

22. The power storage device according to claim 9, wherein

the positioning hole is formed at substantially the center of the stack as viewed in the stacking direction of the stack.

23. The power storage device according to claim 22, wherein

the positioning hole has a circular cross-section.

24. The power storage device according to claim 22, wherein

the positioning hole has a polygonal cross-section.

25. The power storage device according to claim 24, wherein

the positioning member has a polygonal cross-section and edges of the positioning member are chamfered.

26. The power storage device according to claim 9, wherein

each of the electrolytes of the stack contains a binder.

27. The power storage device according to claim 9, wherein

the positive electrodes, the negative electrodes, and the electrolytes of the stack are coaxial with each other about the positioning member.

28. The power storage device according to claim 27, wherein

the diameter of the electrolyte is larger than the diameter of the positive electrode and the diameter of the negative electrode.

29. The power storage device according to claim 9, wherein

an insulating ring, which is a ring-shaped insulating member, is fit on the terminal portion of the positioning member, and

an exterior part of the power storage device is attached via the insulating ring.

15. A method for manufacturing a power storage device that has components constituting a stack, each component having a positioning hole, into which a positioning member is to be inserted, the method comprising:

fitting a lowermost current collector, which has only a negative electrode provided on one side of the lowermost current collector, to the positioning member;

fitting current collectors and electrolytes alternately to the positioning member so that the current collectors and the electrolytes are stacked up on the side of the negative electrode of the lowermost current collector, each of the current collectors having a positive electrode provided on one side of the current collector and a negative electrode provided on the other side of the current collector;

fitting an uppermost current collector, which has only a positive electrode provided on one side of the uppermost current collector, to the positioning member from the side of the positive electrode so that the positive electrode is placed on the electrolyte;

connecting the uppermost current collector and the positive electrode terminal; and

connecting the lowermost current collector and the negative electrode terminal, wherein

the terminal portion is provided with an electric wire that is connected to the positive electrode or the negative electrode of the stack.

16. The method according to claim 15, wherein

the stack is sealed by an insulator such that only the uppermost current collector and the lowermost current collector are exposed.

17. The method according to claim 16, wherein

the insulator is made of resin material.

18. The method according to claim 15, wherein

an insulation treatment is applied to a portion of the positioning member that contacts the stack.

19. A method for manufacturing a power storage device that has components constituting a stack, each component having a positioning hole, into which a positioning member is to be inserted, the method comprising:

fitting a lowermost current collector, which has only a negative electrode provided on one side of the lowermost current collector, to the positioning member;

fitting current collectors and electrolytes alternately to the positioning member so that the current collectors and the electrolytes are stacked up on the side of the negative electrode of the lowermost current collector, each of the current collectors having a positive electrode provided on one side of the current collector and a negative electrode provided on the other side of the current collector;

fitting an uppermost current collector, which has only a positive electrode provided on one side of the uppermost current collector, to the positioning member from the side of the positive electrode so that the positive electrode is placed on the electrolyte;

connecting the uppermost current collector and the positive electrode terminal; and

connecting the lowermost current collector and the negative electrode terminal, wherein

there is provided a terminal portion configured as a conductive layer that covers the end of the positioning member in the inserting direction and extends to one of the positive electrode and the negative electrode that are provided at ends of the stack in the stacking direction such that a surface of the conductive layer contacts a surface of the one of the positive electrode and the negative electrode.

30. The method according to claim 19, wherein

the stack is sealed by an insulator such that only the uppermost current collector and the lowermost current collector are exposed.

31. The method according to claim 30, wherein

the insulator is made of resin material.

32. The method according to claim 19, wherein

an insulation treatment is applied to a portion of the positioning member that contacts the stack.