Energy storage device

• US 20050083021A1
• Filed: 12/31/2003
• Published: 04/21/2005
• Est. Priority Date: 07/12/1999
• Status: Abandoned Application

• Current Assignee: Cap-Xx Ltd.
• Original Assignee: Cap-Xx Ltd.
• Inventors: Mahon, Peter John
• Application Number:
  US10/747,980
• Publication Number:
  US 20050083021A1
• Time in Patent Office: Days
• US Class Current: 320/166
• CPC Class Codes: H01G 11/08 Structural combinations, e.g. assembly or connection, of hybrid or EDL capacitors with other electric components, at least one hybrid or EDL capacitor being the main component
• CPC Class Codes: H01G 11/82 Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/42 Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells H01M10/60 takes precedence
• CPC Class Codes: H01M 10/4264 with capacitors
• CPC Class Codes: H01M 50/107 having curved cross-section, e.g. round or elliptic H01M50/103, H01M50/109, H01M50/11 take precedence
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

An energy storage device includes a cylindrical shrink wrap housing having two opposed metal terminals. An electrochemical device in the form of a dry cell alkaline battery is disposed within the housing for providing an electrical potential between the terminals. An electric double layer supercapacitor is wrapped around and mounted to the housing and connected to the terminals in parallel with the battery.

Claims

1-53. -53. (canceled)

54. An energy storage device including:

a housing having two terminals;

an electrochemical device disposed within the housing for providing an electrical potential between the terminals, wherein the electrochemical device has one or more performance parameters that changes with time; and

a first supercapacitor mounted to the housing and being electrically connected to the terminals in parallel with the electrochemical device for compensating for changes in the one or more performance parameters.

55. An energy storage device according to claim 54 wherein the supercapacitor substantially compensates for the one or more changes in the performance parameters.

56. An energy storage device according to claim 54 wherein the performance parameter is the series impedance of the electrochemical device.

57. An energy storage device according to claim 54 wherein the electrochemical device has an impedance that reduces the potential as current is drawn from the electrochemical device, and the performance parameter corresponds to the reduction in the potential.

58. An energy storage device according to claim 57 wherein the change in the potential is less than a predetermined value.

59. An energy storage device according to claim 54 wherein the performance parameter is the power density of the electrochemical device.

60. An energy storage device according to claim 59 wherein the power density has a predetermined minimum.

61. An energy storage device according to claim 59 wherein the power density is volumetric.

62. An energy storage device according to claim 59 wherein the power density is gravimetric.

63. An energy storage device according to claim 54 wherein the performance parameter is the energy stored in the electrochemical device.

64. An energy storage device according to claim 63 wherein the energy stored has a predetermined minimum.