# US 8,541,117 B2 · Low noise battery with a magnetic compensation structure for wireless mobile communication device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,541,117 B2 - Document ID: US8541117B2 - Status: Granted - Kind: B2 - Application number: 12/616,641 - Filed: 2009-11-11 - Published: 2011-05-12 - Granted: 2013-09-24 - Earliest claimed: 2009-11-11 - Assignees: BlackBerry Limited - Applicants: Andre J. Van Schyndel - Inventors: Andre J. Van Schyndel - Web page: https://patentgrep.com/patent/US8541117B2 ## CPC - H01M 50/54: Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges - H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 50/534: characterised by the material of the leads or tabs - H01M 50/536: characterised by the method of fixing the leads to the electrodes, e.g. by welding - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A battery has an electrode assembly that includes a positive electrode, a negative electrode, and a layer of electrolyte between the positive electrode and the negative electrode. An electric current flow in the positive electrode is unmatched to an electric current flow in the negative electrode, thereby producing a first magnetic field. A magnetic compensation structure is adjacent to the electrode assembly and has body of electrically conductive material connected to one of the positive electrode and the negative electrode. The electric current flowing through the electrode assembly also flows through the body in a pattern that matches the pattern of unmatched electric current in the electrode assembly. As a result a second magnetic field is produced by the magnetic compensation structure that opposes the first magnetic field thereby mitigating magnetic noise from the battery. ## Claims ### Claim 1 An apparatus comprising: an electrode assembly including a positive electrode connected directly to a positive tab, and including the negative electrode spaced from the positive electrode and connected directly to a negative tab; a layer of electrolyte between the positive electrode and the negative electrode, for producing an electric current between the negative electrode and the positive electrode; and a magnetic compensation structure proximate to the electrode assembly and comprising: (a) a base of electrically conductive material; (b) a first conductor electrically connected to the base and spaced from the positive tab and the positive electrode, a first ratio of two dimensional conductivity between the first conductor and the base being substantially similar to a second ratio of two dimensional conductivity between the positive tab and the positive electrode; (c) a second conductor electrically connected to the base and spaced from the second conductor, negative tab and the negative electrode, a third ratio of two dimensional conductivity between the second conductor and the base being substantially similar to a fourth ratio of two dimensional conductivity between a negative tab and a negative electrode. ### Claim 2 (depends on 1) The apparatus as recited in claim 1 wherein the first conductor has a same size and shape as the positive tab and entirely overlies the positive tab; and the second conductor has a same size and shape as the negative tab and entirely overlies the negative tab. ### Claim 3 (depends on 1) The apparatus as recited in claim 1 wherein the base comprises a sheet of electrically conductive material that is folded over on itself, thereby defining a first portion and a second portion of the base, and wherein the first conductor is connected to the first portion and the second conductor is connected to the second portion. ### Claim 4 (depends on 3) The apparatus as recited in claim 3 further comprising electrical insulating material between the first and second portions of the base. ### Claim 5 (depends on 3) The apparatus as recited in claim 3 wherein an electric current flow through the first portion matches an electric current flow in the positive electrode, and an electric current flow through the second portion matches an electric current flow in the negative electrode. ### Claim 6 (depends on 1) The apparatus as recited in claim 1 wherein an electric current flow in the positive electrode is unmatched to an electric current flow in the negative electrode thereby producing a first magnetic field. ### Claim 7 (depends on 6) The apparatus as recited in claim 6 wherein an electric current flow through the base, the first conductor and the second conductor produces a second magnetic field that opposes the first magnetic field. ### Claim 8 (depends on 6) The apparatus as recited in claim 6 wherein the electrode assembly has one of a stacked configuration, a pleated configuration, and a spiral configuration. ### Claim 9 (depends on 1) The apparatus as recited in claim 1 further comprising a wireless mobile communication device connected to at least one of the first conductor and the second conductor. ### Claim 10 An apparatus comprising: an electrode assembly, for providing electrical power, includes a positive electrode, a negative electrode, a positive tab electrically connected to the positive electrode, a negative tab electrically connected to the negative electrode, and a layer of electrolyte between the positive electrode and the negative electrode, wherein an electric current flow in the positive electrode is unmatched to an electric current flow in the negative electrode thereby producing a first magnetic field; and a magnetic compensation structure comprising a body of electrically conductive material electrically connected to one of the positive electrode and the negative electrode, a first compensation conductor electrically connected to the body, and a second compensation conductor electrically connected to the body, wherein the first and second compensation conductors are spaced from the positive tab, the positive electrode, the negative tab, and the negative electrode, and wherein an electric current flow from the electrode assembly through the body produces a second magnetic field that opposes the first magnetic field. ### Claim 11 (depends on 10) The apparatus as recited in claim 10 wherein the positive tab and positive electrode are formed of identical material with the positive tab extending outward from an edge of the positive electrode, and the negative tab and negative electrode are formed of identical material with the negative tab extending outward from an edge of the negative electrode. ### Claim 12 (depends on 10) The apparatus as recited in claim 10 wherein a ratio of two dimensional conductivity between the positive tab and the positive electrode is substantially identical to a ratio of two dimensional conductivity between the first compensation conductor and the body of the magnetic compensation structure, and a ratio of two dimensional conductivity between the negative tab and the negative electrode is substantially identical to a ratio of two dimensional conductivity between the second compensation conductor and the body. ### Claim 13 (depends on 10) The apparatus as recited in claim 10 wherein the magnetic compensation structure is positioned adjacent the electrode assembly with the first compensation conductor overlying the positive tab and the second compensation conductor overlying the negative tab. ### Claim 14 (depends on 13) The apparatus as recited in claim 13 wherein either the first compensation conductor is electrically connected to the positive electrode or the second compensation conductor is electrically connected to the negative electrode. ### Claim 15 (depends on 10) The apparatus as recited in claim 10 wherein the first compensation conductor has a same size and shape as the positive tab and entirely overlies the positive tab; and the second compensation conductor has a same size and shape as the negative tab and entirely overlies the negative tab. ### Claim 16 (depends on 10) The apparatus as recited in claim 10 wherein the body of electrically conductive material comprises a sheet that is folded over on itself along a fold axis, thereby defining a first portion and a second portion of the body, and wherein the first compensation conductor is connected to the first portion and the second compensation conductor is connected to the second portion. ### Claim 17 (depends on 16) The apparatus as recited in claim 16 further comprising electrical insulating material between the first and second portions of the body. ### Claim 18 (depends on 16) The apparatus as recited in claim 16 wherein the electrode assembly is rolled in a spiral about a roll axis, and the fold axis of the magnetic compensation structure is parallel to the roll axis. ### Claim 19 (depends on 16) The apparatus as recited in claim 16 wherein an electric current flow through the first portion matches the electric current flow in the positive electrode, and an electric current flow through the second portion matches the electric current flow in the negative electrode. ### Claim 20 (depends on 10) The apparatus as recited in claim 10 wherein: the positive electrode has a first surface with a first edge and a second edge, the negative electrode has a second surface with a third edge and a fourth edge; the positive tab is electrically connected across the first surface of the positive electrode from the first edge to the second edge, and the negative tab is electrically connected across the second surface from the third edge to the fourth edge; and the magnetic compensation structure further comprises the first compensation conductor electrically connected to the body and overlying the positive tab of the electrode assembly in a spaced apart manner; and the second compensation conductor electrically connected to the body and overlying the negative tab of the electrode assembly in a spaced apart manner. ### Claim 21 (depends on 20) The apparatus as recited in claim 20 wherein the first compensation conductor has a same size and shape as the positive tab and entirely overlies the positive tab, and the second compensation conductor has a same size and shape as the negative tab and entirely overlies the negative tab. ### Claim 22 (depends on 10) The apparatus as recited in claim 10 further comprising a case enclosing the electrode assembly and the magnetic compensation structure. ### Claim 23 (depends on 22) The apparatus as recited in claim 22 further comprising a positive conductor having a strip shape and extending along a surface of the case to a positive terminal, and a negative conductor having a strip shape extending along the surface of the case to a negative terminal, wherein one of the positive and negative conductors overlies the other one of the positive and negative conductors. ### Claim 24 (depends on 23) The apparatus as recited in claim 23 wherein the positive conductor is between the surface of the case and the negative conductor. ### Claim 25 (depends on 10) The apparatus as recited in claim 10 further comprising a case enclosing the electrode assembly, and wherein the magnetic compensation structure is outside the case. ### Claim 26 (depends on 10) The apparatus as recited in claim 10 wherein the electrode assembly has one of a stacked configuration, a pleated configuration, and a spiral configuration. ### Claim 27 (depends on 10) The apparatus as recited in claim 10 further comprising a wireless mobile communication device connected to the electrode assembly and to the magnetic compensation structure. ### Claim 28 An apparatus, for providing electrical power, comprising: an electrode assembly having a positive electrode, a negative electrode, a layer of electrolyte between the positive electrode and the negative electrode, wherein an electric current flows through the positive electrode in a first pattern and flows through the negative electrode in a second pattern that is unmatched to the first pattern, resulting in an unmatched current pattern in a section of the electrode assembly; and a magnetic compensation structure adjacent to the electrode assembly and comprising a body of conductive material spaced from the electrode assembly, a first compensation conductor electrically connected to the body, and a second compensation conductor electrically connected to the body with one of the first compensation conductor and the second compensation conductor electrically connected to one of the positive electrode and the negative electrode, wherein a pattern of current flowing through the body matches the unmatched current pattern in the section of the electrode assembly. ### Claim 29 (depends on 28) The apparatus as recited in claim 28 wherein the electrode assembly is configured in layers and the magnetic compensation structure adjacent to an outer layer of the electrode assembly. ### Claim 30 (depends on 28) The apparatus as recited in claim 28 wherein the electrode assembly further comprises a positive tab electrically connected to the positive electrode, and a negative tab electrically connected to the negative electrode. ### Claim 31 (depends on 28) The apparatus as recited in claim 28 wherein an electric current flowing in the electrode assembly produces a first magnetic field and an electric current flowing in the magnetic compensation structure produces a second magnetic field that opposes the first magnetic field. ### Claim 32 (depends on 30) The apparatus as recited in claim 30 wherein a ratio of two dimensional conductivity between the positive tab and the positive electrode is substantially identical to a ratio of two dimensional conductivity between the first compensation conductor and the body of the magnetic compensation structure, and a ratio of two dimensional conductivity between the negative tab and the negative electrode is substantially identical to a ratio of two dimensional conductivity between the second compensation conductor and the body. ### Claim 33 (depends on 30) The apparatus as recited in claim 30 wherein the first compensation conductor overlies the positive tab, and the second compensation conductor overlies the negative tab. ### Claim 34 (depends on 28) The apparatus as recited in claim 28 wherein either the first compensation conductor is electrically connected to the positive electrode or the second compensation conductor is electrically connected to the negative electrode. ### Claim 35 (depends on 28) The apparatus as recited in claim 28 wherein the body of electrically conductive material comprises a sheet that is folded over on itself along a fold axis, thereby defining a first portion and a second portion of the body, and wherein the first compensation conductor is connected to the first portion and the second compensation conductor is connected to the second portion. ### Claim 36 (depends on 35) The apparatus as recited in claim 35 wherein an electric current flows through the first portion in a pattern that matches the first pattern of current flow in the positive electrode, and an electric current flows through the second portion in another pattern that matches the second pattern of current flow in the negative electrode. ### Claim 37 (depends on 35) The apparatus as recited in claim 35 further comprising electrical insulating material between the first and second portions of the body. ### Claim 38 (depends on 35) The apparatus as recited in claim 35 wherein the electrode assembly is rolled in a spiral about a roll axis, and the fold axis of the magnetic compensation structure is parallel to the roll axis. ### Claim 39 (depends on 28) The apparatus as recited in claim 28 wherein: the positive electrode has a first surface with a first edge and a second edge, the negative electrode has a second surface with a third edge and a fourth edge; and the electrode assembly further comprises a positive tab electrically connected across the first surface of the positive electrode from the first edge to the second edge, and a negative tab electrically connected across the second surface from the third edge to the fourth edge; and the magnetic compensation structure further comprises a first compensation conductor electrically connected to the body and entirely overlying the positive tab of the electrode assembly; and a second compensation conductor electrically connected to the body and entirely overlying the negative tab of the electrode assembly. ### Claim 40 (depends on 28) The apparatus as recited in claim 28 further comprising a case enclosing the electrode assembly and the magnetic compensation structure. ### Claim 41 (depends on 40) The apparatus as recited in claim 40 further comprising a positive conductor having a strip shape extending along a surface of the case to a positive terminal, and a negative conductor having a strip shape extending along the surface of the case to a negative terminal, wherein one of the positive and negative conductors overlies the other one of the positive and negative conductors. ### Claim 42 (depends on 28) The apparatus as recited in claim 28 further comprising a case enclosing the electrode assembly, and wherein the magnetic compensation structure is outside the case. ### Claim 43 (depends on 28) The apparatus as recited in claim 28 further comprising a wireless mobile communication device connected to the electrode assembly and to the magnetic compensation structure. ### Claim 44 (depends on 30) The apparatus as recited in claim 30 wherein the first compensation conductor has a same size and shape as the positive tab and entirely overlies the positive tab; and the second compensation conductor has a same size and shape as the negative tab and entirely overlies the negative tab.