Bipolar battery, assembled battery, combination assembled battery, and vehicle using the assembled battery or the combination assembled battery

• US 20050031953A1
• Filed: 08/06/2004
• Published: 02/10/2005
• Est. Priority Date: 08/08/2003
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Watanabe, Kyoichi, Nemoto, Kouichi
• Granted Patent: US 7,501,206 B2
• Time in Patent Office: Days
• US Class Current: 429/210
• 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 10/127 with bipolar electrodes
• CPC Class Codes: H01M 50/119 Metals
• CPC Class Codes: H01M 50/121 Organic material
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: H01M 50/1243 characterised by the internal coating on the casing
• CPC Class Codes: H01M 50/129 with two or more layers of only organic material
• CPC Class Codes: H01M 50/131 characterised by physical properties, e.g. gas permeability, size or heat resistance
• CPC Class Codes: H01M 50/133 Thickness
• CPC Class Codes: H01M 50/14 for protecting against damage caused by external factors
• CPC Class Codes: H01M 6/48 with bipolar electrodes
• CPC Class Codes: H01M 6/485 Side-by-side bipolar batteries
• 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

Abstract

A bipolar battery of the present invention includes a battery element composed by stacking in series a plurality of bipolar electrodes, in each of which a positive electrode is formed on one surface of a collector and a negative electrode is formed on the other surface, with electrolytes interposed therebetween. Further, the bipolar battery includes laminate films covering the battery element, each of the laminate films containing a metal layer, and tabs composed by being extracted from the battery element to outsides of the laminate films. In the bipolar battery, thickness of a resin layer interposed between the tab and the metal layer is equal to or more than thickness of the tab.

Claims

1. A bipolar battery, comprising:

a battery element composed by stacking in series a plurality of bipolar electrodes, in each of which a positive electrode is formed on one surface of a collector and a negative electrode is formed on the other surface, with electrolytes interposed therebetween;

laminate films covering the battery element, each of the laminate films containing a metal layer; and

tabs composed by being extracted from the battery element to outsides of the laminate films,

wherein thickness of a resin layer interposed between the tab and the metal layer is equal to or more than thickness of the tab.

2. A bipolar battery according to claim 1,

wherein the thickness of the resin layer is within a range from 1 to 5 times the thickness of the tabs.

3. A bipolar battery according to claim 1,

wherein the thickness of the resin layer is within a range from 15 to 1000 μ

m.

4. A bipolar battery according to claim 1,

wherein the resin layer is composed of any of one resin selected from the group consisting of polyethylene series resin, polypropylene series resin, polyamide series resin, and one composed by stacking two or more resins selected from the group.

5. A bipolar battery according to claim 4,

wherein the resin layer is composed of any of one resin selected from the group consisting of low-density polyethylene, non-modified polypropylene, nylon 6,6, nylon 6,10, and one composed by stacking two or more resins selected from the group.

6. A bipolar battery according to claim 1,

wherein Young'"'"'s modulus of resin constituting the resin layer is within a range from 0.01×

10¹⁰ to 0.30×

10¹⁰ N/m².

7. A bipolar battery according to claim 1,

wherein the positive electrode contains Li—

Mn based composite oxide.

8. A bipolar battery according to claim 1,

wherein the negative electrode contains any one of a crystalline carbon material and a non-crystalline carbon material.

9. An assembled battery, comprising:

a plurality of bipolar batteries, each including;

a battery element composed by stacking in series a plurality of bipolar electrodes, in each of which a positive electrode is formed on one surface of a collector and a negative electrode is formed on the other surface, with electrolytes interposed therebetween;

laminate films covering the battery element, each of the laminate films containing a metal layer; and

tabs composed by being extracted from the battery element to outsides of the laminate films,

wherein thickness of a resin layer interposed between the tab and the metal layer is equal to or more than thickness of the tab, and

the plurality of bipolar batteries are connected in parallel and/or in series.

10. An assembled battery according to claim 9, further comprising:

a battery group composed by connecting in series a number of batteries, the battery including a power generating element which is formed by stacking positive electrode plates in each of which positive electrode layers composed of the same materials of the positive electrode of the bipolar battery are formed on both surfaces of a positive electrode collector, negative electrode plates in each of which negative electrode layers composed of the same materials of the negative electrode of the bipolar battery are formed on both surfaces of a negative electrode collector, and separators interposed therebetween,

wherein the bipolar battery and the battery group are connected in parallel.

11. An assembled battery according to claim 9,

wherein a plurality of the assembled batteries are connected to one another, and a combination assembled battery is formed.

12. An assembled battery according to claim 9,

wherein the assembled battery is mounted on a vehicle.