Current collector for electrochemical energy storage apparatus

Patent metadata

Field	Value
Publication number	US-10700336-B2
Application number	US-201715499354-A
Country	US
Kind code	B2
Filing date	Apr 27, 2017
Priority date	Oct 31, 2014
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

An electrochemical energy storage apparatus, in particular a rechargeable lithium-ion battery, having at least one current collector device with at least one current conductor arm, and at least one energy storage cell which has at least one anode, one cathode and one separator. The separator touches the anode and the cathode at least in sections in, in each case, a separator contact area. The current conductor arm can be electrically conductively connected to, in each case, at least one anode or cathode by way of a current output conductor contact area. A surface normal on the current output conductor contact area and a surface normal on the separator contact area form an acute angle a. This angle a is selected from a range which is greater than 5°, with preference greater than 15°, preferably greater than 25° and particularly preferably greater than 35°, and furthermore the angle α is less than or equal to 90°, with preference less than 75°, preferably less than 65° and particularly preferably less than 45°.

First claim

What is claimed is:

1. An electrochemical energy storage apparatus, comprising:
at least one current collector device with at least one first current conductor arm;
at least one first energy storage cell which has at least one anode, one cathode and one separator in a first arrangement; and
at least one second energy storage cell which is different from the at least one first energy storage cell,
wherein the separator touches the anode and the cathode at least in sections in, in each case, a separator contact area,
the first current conductor arm is electrically conductively connectable to, in each case, at least one anode or cathode via a current output conductor contact area,
a surface normal on the current output conductor contact area and a surface normal on the separator contact area enclose an acute angle α,
the angle α is greater than 5° and is less than 90°,
the first current conductor arm is electrically conductively connectable to the first energy storage cell and disposed at least in part externally of the first arrangement,
a second current conductor arm is electrically conductively connectable to the second energy storage cell, and
the first and second current conductor arms are inclined diametrically opposed to each other such that the first and second current conductor arms form a V-shape profile disposed such that a bottom end of the V-shape profile, at which a vertex of the V-shape profile is located, is closer to the at least one first and second energy storage cells than a top-end of the V-shape profile.

2. The electrochemical energy storage apparatus according to claim 1 , wherein the apparatus is a rechargeable lithium-ion battery.

3. The electrochemical energy storage apparatus according to claim 1 , wherein
the angle α is greater than 35° and is less than 45°.

4. The electrochemical energy storage apparatus according to claim 1 , wherein the first arrangement is a bag cell or a pouch cell.

5. The electrochemical energy storage apparatus according to claim 1 , wherein
the first and second current conductor arms are arranged mirror symmetrically with respect to each other at least in sections or completely.

6. The electrochemical energy storage apparatus according to claim 1 , wherein
the first current conductor arm is disposed at least in part externally of the first energy storage cell, and
the second current conductor arm is disposed at least in part externally of the second energy storage cell.

7. The electrochemical energy storage device according to claim 1 , wherein
a separating area is arranged between the first energy storage cell and the second energy storage cell,
the first current conductor arm on a side of the first energy storage cell extends as far as said separating area or is spaced apart therefrom by a first defined distance, and
the second current conductor arm on a side of the second energy storage cell extends as far as said separating area or is spaced apart therefrom by a second defined distance.

8. The electrochemical energy storage apparatus according to claim 1 , wherein
the current collector device has the second current conductor arm,
a surface normal on a second current output contact area and the surface normal on the separator contact area encloses an acute angle β,
the angle β is greater than 5° and is less than 90°.

9. The electrochemical energy storage apparatus according to claim 8 , wherein
the angle β is greater than 35° and is less than 45°.

10. The electrochemical energy storage apparatus according to claim 8 , wherein
the angle α is greater than 35° and is less than 45°, and
the angle β is greater than 35° and is less than 45°.

11. The electrochemical energy storage apparatus according to claim 8 , wherein
the first and second current conductor arms each are rotated about an axis of a width direction of the first and second energy cells, respectively to form the angle α and the angle β, respectively.

12. An electrochemical energy storage apparatus, comprising:
at least one current collector device with at least one first current conductor arm;
at least one first energy storage cell which has at least one anode, one cathode and one separator in a first arrangement; and
at least one second energy storage cell which is different from the at least one first energy storage cell and disposed outside the first arrangement,
wherein the separator touches the anode and the cathode at least in sections in, in each case, a separator contact area,
the first current conductor arm is electrically conductively connectable to, in each case, at least one anode or cathode via a current output conductor contact area,
a surface normal on the current output conductor contact area and a surface normal on the separator contact area enclose an acute angle α,
the angle α is greater than 5° and is less than 90°,
the first current conductor arm is electrically conductively connectable to the first energy storage cell,
a second current conductor arm is electrically conductively connectable to the second energy storage cell, and
the first and second current conductor arms are inclined diametrically opposed to each other such that the first and second current conductor arms form a V-shape profile disposed such that a bottom end of the V-shape profile, at which a vertex of the V-shape profile is located, is closer to the at least one first and second energy storage cells than a top-end of the V-shape profile.

13. The electrochemical energy storage apparatus according to claim 12 , wherein the first arrangement is a bag cell or a pouch cell.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Loos Daniel
• Schleicher Andreas
• Lustig Robert

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M50/533 Primary

  characterised by the shape of the leads or tabs · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title