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US 2001/0033953 A1Published application
Conversion of low rate energy into high rate energy by parallel discharging
AssigneeWilson Greatbatch Ltd.
InventorsHong Gan, Esther S. Takeuchi
Life of this patent
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Abstract
An electrode configuration for use in a defibrillator battery to improve the battery capacity and its utilization efficiency by using a combination SVO cell and a CFx cell discharged in parallel, is described. In other words, the anode of the SVO cell is connected to the anode of the CFx cell and the cathode of the SVO cell is connected to the cathode of the CFx cell. The SVO cell provides a relatively high discharge rate while the CFx cell results in long service life. This results in 100% of the usable capacity from both cells being utilized.
Claims39
An electrochemical battery, comprising:
- a) a first electrochemical cell comprising:
- i) a first anode comprising alkali metal electrically associated with a first anode current collector;
- ii) terminal for connecting the first anode current collector to an external lead;
- iii) a first cathode of a first cathode active material electrically associated with a first cathode current collector;
- iv) terminal for connecting the first cathode current collector to an external lead;
- and
- v) a first electrolyte operatively associated with the first anode and the first cathode;
- and
- b) a second electrochemical cell comprising:
- i) a second anode comprising alkali metal electrically associated with a second anode current collector;
- ii) terminal for connecting the second anode current collector to an external lead;
- iii) a second cathode of a second cathode active material electrically associated with a second cathode current collector;
- iv) terminal for connecting the second cathode current collector to an external lead;
- and
- v) a second electrolyte operatively associated with the second anode and the second cathode;
- and
- wherein the first cell is connected in parallel to the second cell and wherein the first cathode active material has a relatively high energy density but a relatively low rate capability and the second cathode active material has a relatively low energy density but a relatively high rate capability.
14 more elements
An electrochemical battery, comprising:
- a) a casing;
- b) a first electrochemical cell housed within the casing, the first cell comprising:
- i) a first anode comprising alkali metal electrically associated with a first anode current collector;
- ii) a first cathode of a first cathode active material electrically associated with a first cathode current collector;
- and
- iii) an electrolyte solution operatively associated with the first anode and the first cathode;
- and
- c) a second electrochemical cell housed within the casing, the second cell comprising:
- i) a second anode comprising alkali metal electrically associated with a second anode current collector;
- ii) a second cathode of a second cathode active material electrically associated with a second cathode current collector;
- and
- iii) the electrolyte solution operatively associated with the second anode and the second cathode;
- and
- wherein the first cell is connected in parallel to the second cell and wherein the first cathode active material has a relatively high energy density but a relatively low rate capability and the second cathode active material has a relatively low energy density but a relatively high rate capability.
11 more elements
In combination with an implantable medical device requiring electrical power for a monitoring function and a device operating function, a battery comprising:
- a) a first cell having a first anode comprising lithium and a first cathode comprising silver vanadium oxide;
- b) a second cell having a second anode comprising lithium and a second cathode comprising fluorinated carbon;
- and
- c) a casing containing both cells connected in parallel and activated by a nonaqueous electrolyte.
1 more element
An electrochemical battery, which comprises:
- a) a first cell having a first anode and a first cathode of a first cathode active material of a relatively high energy density but a relatively low rate capability;
- b) a second cell having a second anode and a second cathode of a second cathode active material of a relatively low energy density but a relatively high rate capability, wherein the first cell is connected in parallel to the second cell so that first and second cells are dischargeable together at a relatively low electrical current of about 1 microampere to about 100 milliamperes and wherein the second cell is dischargeable at a relatively high electrical current of about 1 to about 4 amperes such that should a background voltage of the second cell fall below a working voltage of the first cell, the second cell is recharged by the first cell to equalize each of their working voltages.
A method for providing an electrochemical battery capable of discharge at both a substantially constant discharge rate and under a current pulse discharge application, which comprises:
- d) providing a first electrochemical cell, comprising the steps of:
- i) providing a first anode comprising alkali metal and electrically associating the alkali metal with a first anode current collector;
- ii) providing a first cathode of cathode active material and electrically associating the first cathode active material with a first cathode current collector;
- and
- iii) activating the first electrochemical cell with an electrolyte solution operatively associated with the first anode and the first cathode;
- and
- e) providing a second electrochemical cell, comprising the step of:
- i) providing a second anode comprising alkali metal and electrically associating the alkali metal with a second anode current collector;
- ii) providing a second cathode of cathode active material and electrically associating the second cathode active material with a second cathode current collector;
- and
- iii) activating the second electrochemical cell with the electrolyte solution operatively associated with the second anode and the second cathode;
- wherein the first cell is connected in parallel to the second cell and wherein the first cathode active material has a relatively high energy density but a relatively low rate capability and the second cathode active material has a relatively low energy density but a relatively high rate capability.
9 more elements
Dependencies are inferred from the claim text.