Electrochemical Cell with Reduced Magnetic Field Emission and Corresponding Devices

• US 20110262779A1
• Filed: 10/31/2010
• Published: 10/27/2011
• Est. Priority Date: 04/23/2010
• Status: Abandoned Application

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Inventors: Frenzer, Michael, Maleki, Hossein, Krause, Jim, Hallmark, Jerald A.
• Application Number:
  US12/916,573
• Publication Number:
  US 20110262779A1
• Time in Patent Office: Days
• US Class Current: 429/10
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: H01M 50/1245 characterised by the external coating on the casing
• CPC Class Codes: H01M 50/533 characterised by the shape of the leads or tabs
• 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 battery pack having reduced magnetic emitted noise includes a housing having an electrode assembly (700) disposed therein. The electrode assembly (700) includes a cell stack comprising a cathode (701) and an anode (702) with a separator disposed therebetween. The cell stack of the electrode assembly (700) has a first end (705) and a second end (706). A first electrical conductor (703) coupled to the anode (702) at the first end (705) of the cell stack. A second electrical conductor (704) coupled to the cathode (701) at the first end (705) of the cell stack. The first electrical conductor (703) and second electrical conductor (704) can be configured with different lengths, geometrical shapes, or placement locations such that during discharge, current (711,712) passes across the cathode (701) and anode (702) in substantially opposite directions at a substantially similar magnitude so as to reduce magnetic field noise generated by the electrode assembly (700).

Claims

1. An electrode assembly for a cell, the electrode assembly comprising:

a cell stack comprising a cathode and an anode with a separator therebetween, the cell stack having a first end and a second end;

a first electrical conductor coupled to the anode at the first end of the cell stack; and

a second electrical conductor coupled to the cathode at the first end of the cell stack;

wherein the second electrical conductor is longer than the first electrical conductor; and

wherein during discharge, current passes through the first electrical conductor and second conductor, and across the cathode and the anode, in substantially opposite directions at a substantially similar magnitude so as to reduce magnetic field noise generated by the electrode assembly.

2. The electrode assembly of claim 1, wherein the first electrical conductor and the second electrical conductor are disposed atop each other at the first end, the electrode assembly further comprising an electrical insulation layer disposed between the first electrical conductor and the second electrical conductor.

3. The electrode assembly of claim 1, wherein the cell stack is wound into a jellyroll.

4. The electrode assembly of claim 1, wherein the cell stack is folded.

5. The electrode assembly of claim 1, further comprising an electronic device coupled to the electrode assembly, wherein the first electrical conductor and second electrical conductor are coupled to tabs disposed on a common end of the electrode assembly, wherein the common end is disposed nearer the electronic device than an opposite end from to the common end.

6. The electrode assembly of claim 1, wherein one or more of the first electrical conductor and the second electrical conductor comprise one of an L-shape or an inverted L-shape.

7. The electrode assembly of claim 1, wherein one or more of the first electrical conductor and the second electrical conductor comprise one of a U-shape, a J-shape, or inversions thereof.

8. The electrode assembly of claim 1, wherein the second electrical conductor comprises a non-linear surface area that passes about at least an end portion of the first electrical conductor.

9. The electrode assembly of claim 1, further comprising a housing into which the electrode assembly is disposed and a header having at least a first electrical contact coupled to the anode and a second electrical contact coupled to the cathode.

10. The electrode assembly of claim 9, further comprising one or more conductor turns disposed between one or more of the anode and the first electrical contact or the cathode and the second electrical contact, the one or more conductor turns being configured to further reduce the magnetic field noise.

11. The electrode assembly of claim 10, wherein the one or more conductor turns are disposed along the header.

12. The electrode assembly of claim 10, wherein the one or more conductor turns are disposed along the housing.

13. The electrode assembly of claim 9, wherein the housing is coated with a high magnetic permeability material.

14. The electrode assembly of claim 1, wherein one or more of the anode or the cathode is impregnated with a high magnetic permeability material.

15. The electrode assembly of claim 1, wherein one or more of the anode or the cathode is coated with a high magnetic permeability material.

16. A battery pack, comprising:

an anode;

a cathode;

a separator disposed between the anode and the cathode; and

electrical conductors coupling terminals disposed outside the battery pack to the anode and the cathode, respectively, wherein a cathode-coupled electrical conductor is longer than an anode-coupled electrical conductor;

wherein the electrical conductors are arranged within the battery pack such that magnetic fields generated within the battery pack by combinations of the anode, the cathode, and the electrical conductors are reduced during discharge of the battery pack by causing currents in the anode and the cathode to flow in opposite direction at substantially similar magnitudes.

17. The battery pack of claim 16, wherein the cathode, the anode, and the separator are arranged in a stack, wherein the electrical conductors are coupled to the anode and the cathode, respectively, at one end of the stack.

18. The battery pack of claim 17, further comprising additional electrical conductors coupled to the anode and the cathode at another end of the stack, thereby configuring the stack such that the currents flowing the anode and the cathode at each end of the stack are substantially opposite in direction and substantially equivalent in magnitude.

19. An electrode assembly for a battery, the electrode assembly comprising:

a cell stack comprising a cathode and an anode with a separator therebetween, the cell stack having a first end and a second end;

a first electrical conductor coupled to the anode at the first end of the cell stack; and

a second electrical conductor coupled to the cathode at the first end of the cell stack;

wherein one or more of the first electrical conductor and the second electrical conductor comprises a non-linear length; and

wherein during discharge, current passes through the first electrical conductor and second conductor, and across the cathode and the anode, in substantially opposite directions at a substantially similar magnitude so as to reduce magnetic field noise generated by the electrode assembly.

20. The electrode assembly of claim 19, wherein:

the non-linear length is configured as one of an L-shape, a U-shape, a J-shape, or inversions thereof; and

the first electrical conductor and the second electrical conductor have differing lengths.