Power storage device

• US 8,124,265 B2
• Filed: 12/20/2007
• Issued: 02/28/2012
• Est. Priority Date: 12/21/2006
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Nakamura, Yoshiyuki
• Primary Examiner(s): Ryan, Patrick
• Assistant Examiner(s): Anthony, Julian
• Application Number:
  US12/297,262
• Publication Number:
  US 20090280399A1
• Time in Patent Office: 1,531 Days
• Field of Search: 429/209, 429/234, 429/126, 429/120, 429/128, 429/304, 429/305
• US Class Current: 429/120
• CPC Class Codes: H01G 11/28 arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
• 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 10/18 with bipolar electrodes
• CPC Class Codes: H01M 10/282 with bipolar electrodes
• CPC Class Codes: H01M 10/3918 characterised by the electrolyte
• CPC Class Codes: H01M 10/3981 Flat cells
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/647 Prismatic or flat cells, e.g. pouch cells
• CPC Class Codes: H01M 10/6551 Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
• CPC Class Codes: H01M 2300/0065 Solid electrolytes
• CPC Class Codes: H01M 4/70 characterised by shape or form
• 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: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A power storage device includes: an electrolyte layer; and an electrode consisted of a current collecting portion and an electrode layer, wherein the thickness of the electrolyte layer is larger at a first position in a plane perpendicular to the stacking direction than at a second position where the heat radiation is higher than at the first position, and the thickness of the current collecting portion is smaller at a position corresponding to the first position than at a position corresponding to the second position.

Claims

1. A power storage device comprising:

an electrolyte layer having a thickness; and

an electrode constituted of a current collecting portion and an electrode layer, the current collecting portion and the electrode layer having thicknesses, wherein

the thickness of the electrolyte layer is larger at a first position in a plane perpendicular to a stacking direction in which components of the power storage device are stacked than at a second position at which heat radiation is higher than at the first position, and

the thickness of the current collecting portion is smaller at a position corresponding to the first position than at a position corresponding to the second position.

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

the difference between the thickness of the electrolyte layer at the first position and the thickness of the electrolyte layer at the second position is substantially equal to the difference between the thickness of the current collecting portion at the position corresponding to the first position and the thickness of the current collecting portion at the position corresponding to the second position.

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

the thickness of the electrode layer at a position corresponding to the first position and the thickness of the electrode layer at a position corresponding to the second position are substantially equal to each other.

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

the thickness of the electrode layer at a position corresponding to the first position is smaller than the thickness of the electrode layer at a position corresponding to the second position.

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

the difference between the thickness of the electrolyte layer at the first position and the thickness of the electrolyte layer at the second position is substantially equal to the difference between the thickness of the electrode at the position corresponding to the first position and the thickness of the electrode at the position corresponding to the second position.

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

the first position is a position corresponding to substantially a center of the electrolyte layer, and

the second position is a position corresponding to a periphery of the electrolyte layer.

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

the thickness of the electrolyte layer continuously increases from the second position to the first position, and

the thickness of the current collecting portion continuously decreases from the second position to the first position.

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

the thickness of the electrode layer continuously decreases from the second position to the first position.

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

the thickness of the electrolyte layer increases in steps from the second position to the first position, and

the thickness of the current collecting portion decreases in steps from the second position to the first position.

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

the thickness of the electrode layer decreases in steps from the second position to the first position.

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

the electrode layer has a region with no electrode layer in a plane perpendicular to the stacking direction.

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

the electrolyte layer has a region with no electrolyte layer which is located at a position corresponding the region with no electrode layer.

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

the electrode and the electrolyte layer are provided in plurality, and the plurality of electrodes are stacked in a manner such that a respective pair of the plurality of electrodes interposes one of the plurality of electrolyte layers therebetween.

14. The power storage device according to claim 13, wherein the thickness of at least one of the electrolyte layers is larger than the thickness of the other of the electrolyte layers.