Hybrid battery system
First Claim
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1. A hybrid, rechargeable battery system comprising:
- a high power battery and a high energy density battery, where the high energy density battery has an energy density greater than the high power battery and a peak power density less than the high power battery, wherein the energy density of said high energy density battery is at least 250 WH/kg and wherein the peak power density of said high power battery is at least 5 KW/kg as measured when said high power battery is discharged from a fully charged state to 2 volts over 5 seconds, wherein the high power battery and the high energy density battery are connected in a parallel electrical relationship, and wherein an open circuit voltage of said high energy density battery is greater than an open circuit voltage of said high power battery up to at least an 80% degree of discharge.
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Abstract
A rechargeable, hybrid battery system incorporates a high power battery component and a high energy density battery component. The voltage of the high energy density battery varies as a function of its state of charge, but remains greater than the voltage of the high power battery throughout the operating range of the battery system.
45 Citations
17 Claims
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1. A hybrid, rechargeable battery system comprising:
a high power battery and a high energy density battery, where the high energy density battery has an energy density greater than the high power battery and a peak power density less than the high power battery, wherein the energy density of said high energy density battery is at least 250 WH/kg and wherein the peak power density of said high power battery is at least 5 KW/kg as measured when said high power battery is discharged from a fully charged state to 2 volts over 5 seconds, wherein the high power battery and the high energy density battery are connected in a parallel electrical relationship, and wherein an open circuit voltage of said high energy density battery is greater than an open circuit voltage of said high power battery up to at least an 80% degree of discharge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A hybrid, rechargeable battery system comprising:
a high power battery and a high energy density battery, where the high energy density battery has an energy density greater than the high power battery and a peak power density less than the high power battery, wherein an open circuit voltage of the high energy density battery is in the range of 4.0-4.4 at a 0 degree of discharge and is in the range of 3.0-3.5 at a degree of discharge of 0.8, wherein the high power battery and high energy density battery are connected in a parallel electrical relationship, wherein the open circuit voltage of said high energy density battery is greater than an open circuit voltage of said high power battery up to at least an 80% degree of discharge, and wherein the open circuit voltage of the high energy density battery has a sloping profile versus the degree of discharge of the high energy density battery.
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17. A hybrid, rechargeable battery system comprising:
a high power battery and a high energy density battery, where the high energy density battery has an energy density greater than the high power battery and a peak power density less than the high power battery, wherein an open circuit voltage of said high power battery is in the range of 3.2-3.5 at a 0 degree of discharge and is in the range of 3.1-3.5 at a degree of discharge of 0.5, and wherein the high power battery and high energy density battery are connected in a parallel electrical relationship and wherein the energy density of said high energy density battery is at least 250 WH/kg and wherein the peak power density of said high power battery is at least 5 KW/kg as measured when said high power battery is discharged from a fully charged state to 2 volts over 5 seconds.
Specification