Energy storage device

• US 10,644,293 B2
• Filed: 04/24/2017
• Issued: 05/05/2020
• Est. Priority Date: 04/25/2016
• Status: Active Grant

• Current Assignee: GS Yuasa International Ltd. (GS Yuasa Corporation)
• Original Assignee: GS Yuasa International Ltd. (GS Yuasa Corporation)
• Inventors: Maeda, Kazuto, Kambayashi, Hirokazu
• Primary Examiner(s): Eoff, Anca
• Application Number:
  US15/495,502
• Publication Number:
  US 20170309886A1
• Time in Patent Office: 1,107 Days
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 50/176 for prismatic or rectangular cells H01M50/181 takes precedence
• CPC Class Codes: H01M 50/528 Fixed electrical connections, i.e. not intended for disconnection
• CPC Class Codes: H01M 50/538 Connection of several leads or tabs of wound or folded electrode stacks
• CPC Class Codes: H01M 50/55 on the same side of the cell
• CPC Class Codes: H01M 50/553 Terminals adapted for prismatic, pouch or rectangular cells
• 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

An energy storage device comprising: electrode terminals; an electrode assembly formed by stacking a positive electrode plate and a negative electrode plate; and current collectors which connect the electrode terminals and the electrode assembly to each other, wherein at least one of the positive electrode plate and the negative electrode plate has a plurality of tab groups which are joined to the current collector, each tab group being formed by stacking one or more tabs projecting toward the electrode terminal, and at least one tab group among the tab groups and the current collector has a swaged joint portion, the swaged joint portion projecting from either one of the tab group or the current collector to the other of the tab group or the current collector.

Claims

1. An energy storage device, comprising:

electrode terminals;

an electrode assembly formed by stacking a positive electrode plate and a negative electrode plate;

current collectors which connect the electrode terminals and the electrode assembly to each other,

wherein at least one of the positive electrode plate and the negative electrode plate includes a plurality of tab groups which are joined to one of the current collectors, each tab group being formed by stacking one or more tabs projecting toward the electrode terminals, and

wherein at least one tab group among the tab groups and one current collector among the current collectors include a swaged joint portion, the swaged joint portion projecting from one tab group among the tab groups or one current collector among the current collectors to an other one of the one tab group among the tab groups or the one current collector among the current collectors; and

a cover material which overlaps with the at least one tab group among the tab groups and is fixed with the at least one tab group among the tab groups, and

wherein, in a stacking direction of the cover material on the at least one tab group, a projection portion or a recessed portion extends on a surface of the cover material, and the projection portion or the recessed portion is disposed at a position away from the swaged joint portion.

2. The energy storage device according to claim 1, wherein the tab groups are disposed at different positions when viewed in a stacking direction of the tabs.

3. The energy storage device according to claim 1, wherein the current collectors include a plurality of plate portions joined to the tab groups, and among the tab groups and the plate portions, a tab group and a plate portion which correspond to each other include the swaged joint portion, the swaged joint portion projecting from one of the tab group or the plate portion to an other one of the tab group or the plate portion.

4. The energy storage device according to claim 1, wherein the current collectors include plate portions disposed between two tab groups among the tab groups, and the plate portions and the two tab groups include the swaged joint portion, respectively, the swaged joint portion projecting from one of a plate portion of the plate portions or a tab group of the two tab groups to an other one of the plate portion of the plate portions or the tab group of the two tab groups.

5. The energy storage device according to claim 4, wherein two swaged joint portions, which the current collectors and two tab groups have, project in directions opposite to each other.

6. The energy storage device according to claim 1, wherein the swaged joint portion projects from one tab group among the tab groups to one current collector among the current collectors.

7. The energy storage device according to claim 1, wherein the swaged joint portion projects from one current collector among the current collectors to one tab group among the tab groups.

8. The energy storage device according to claim 1, wherein the cover material overlaps with the at least one tab group in a stacking direction of the at least one tab group on one current collector among the current collectors.

9. The energy storage device according to claim 1, wherein the cover material is disposed on a surface of the at least one tab group.

10. The energy storage device according to claim 1, wherein the cover material is disposed on an entirety of a surface of the at least one tab group.

11. The energy storage device according to claim 1, wherein the cover material includes the projection portion.

12. The energy storage device according to claim 1, wherein the cover material includes the recessed portion.

13. The energy storage device according to claim 1, wherein the current collector include:

a first connecting portion which has a plate shape; and

a second connecting portion and a third connecting portion which project from the first connecting portion toward the electrode assembly.

14. An energy storage device, comprising:

an electrode terminal;

an electrode assembly formed by stacking a positive electrode plate and a negative electrode plate; and

a current collector which connects the electrode terminal and the electrode assembly to each other,

wherein one of the positive electrode plate and the negative electrode plate includes a plurality of tab groups which are joined to the current collector, each tab group being formed by stacking one or more tabs projecting toward the electrode terminal,

wherein at least one tab group among the tab groups and the current collector includes a swaged joint portion, the swaged joint portion projecting from one of the tab group or the current collector to an other one of the tab group or the current collector, and

wherein the current collector includes;

a first connecting portion which has a plate shape; and

a second connecting portion and a third connecting portion which project from the first connecting portion toward the electrode assembly.

15. The energy storage device according to claim 14, further comprising:

a cover material disposed on a surface of the at least one tab group,

wherein a projection portion extends on a surface of the cover material, and

wherein, in a stacking direction of the cover material on the at least one tab group, the projection portion projects from the surface of the cover material away from the at least one tab group.

16. The energy storage device according to claim 14, further comprising:

a cover material disposed on a surface of the at least one tab group,

wherein a recessed portion extends on a surface of the cover material, and

wherein, in a stacking direction of the cover material on the at least one tab group, the recessed portion extends from the surface of the cover material towards the at least one tab group.

17. An energy storage device, comprising:

electrode terminals;

an electrode assembly formed by stacking and winding a positive electrode plate and a negative electrode plate and;

current collectors which connect the electrode terminals and the electrode assembly to each other,

wherein at least one of the positive electrode plate and the negative electrode plate includes a plurality of tab groups which are joined to one of the current collectors, each tab group being formed by stacking one or more tabs projecting toward the electrode terminals, and

wherein at least one tab group among the tab groups and one current collector among the current collectors include a swaged joint portion, the swaged joint portion projecting from one tab group among the tab groups or one current collector among the current collectors to an other one of the one tab group among the tab groups or the one current collector among the current collectors; and

a cover material disposed on a surface of the at least one tab group,

wherein, in a stacking direction of the cover material on the at least one tab group, a projection portion or a recessed portion extends on a surface of the cover material, and the projection portion or the recessed portion is disposed at a position away from the swaged joint portion.