Lithium-Ion Secondary Battery

• US 20110129706A1
• Filed: 08/17/2010
• Published: 06/02/2011
• Est. Priority Date: 11/30/2009
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: TAKAHASHI, Kazuo, Fujimura, Hidekazu, Yanai, Yoshimi, Takahashi, Ko
• Application Number:
  US12/857,951
• Publication Number:
  US 20110129706A1
• Time in Patent Office: Days
• US Class Current: 429/94
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/654 located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
• CPC Class Codes: H01M 50/528 Fixed electrical connections, i.e. not intended for disconnection
• 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

Abstract

A lithium-ion secondary battery includes: a winding body in a coil formation at a battery container, the winding body wrapping a cathode film in which lithium ions store and from which lithium ions extract and a anode film in which lithium ions store and from which lithium ions extract, and the cathode film and the anode film being electrically separated from each other via a porous separator; and a heat sink disposed inside the battery container, which contacts the battery container and transmits heat inside the winding body to the battery container.

Claims

1. A lithium-ion secondary battery, comprising:

a winding body in a coil formation at a battery container, the winding body wrapping a cathode film in which lithium ions store and from which lithium ions extract and a anode film in which lithium ions store and from which lithium ions extract, and the cathode film and the anode film being electrically separated from each other via a porous separator; and

a heat sink disposed inside the battery container, which contacts the battery container and transmits heat inside the winding body to the battery container.

2. A lithium-ion secondary battery according to claim 1, further comprising:

a center pin constituted of a material similar to a material constituting the heat sink, which is located at a center of the winding body.

3. A lithium-ion secondary battery according to claim 2, further comprising:

an anode collector ring disposed between the center pin and the heat sink, constituted of a material similar to the material constituting the center pin and the heat sink, and connected to an anode tab.

4. A lithium-ion secondary battery according to claim 3, wherein:

an area over which the heat sink contacts the anode collector ring is greater than an area over which the center pin contacts the anode collector ring.

5. A lithium-ion secondary battery according to claim 1, further comprising:

a top cap connected, via an electrically insulating packing, to the battery container; and

a cathode collector ring electrically connected to the top cap via a cathode connecting member and connected to a cathode tab.

6. A lithium-ion secondary battery according to claim 5, further comprising:

an electrically insulating connecting ring that is connected to the cathode collector ring and the center pin.

7. A lithium-ion secondary battery according to claim 1, further comprising:

a center pin located at a center of the winding body and constituted of a material with a high coefficient of thermal conductivity, wherein;

the center pin and the heat sink are connected.

8. A lithium-ion secondary battery according to claim 7, wherein:

the cathode film, the anode film and the separator wind around the center pin.

9. A lithium-ion secondary battery, comprising:

a winding body that wraps a cathode film and an anode film via a separator, the cathode film including electrode layers and a cathode collector portion with no electrode layer formed thereat disposed on a side along a widthwise direction, the anode film including electrode layers and an anode collector portion with no electrode layer formed thereat disposed on another side along a widthwise direction, and the separator electrically separating the cathode film and the anode film from each other;

a battery canister accommodating the winding body, which includes an anode external terminal connected with the anode collector portion and a cathode external terminal connected with the cathode collector portion;

a center core ranging at a central area of the winding body; and

a heat sink disposed at one end of the center pin and connected to an inner surface of the battery canister.

10. A lithium-ion secondary battery according to claim 9, further comprising:

an insulating member disposed at another end of the center pin and connected to the inner surface of the battery canister.