Switched passive architectures for batteries having two different chemistries
First Claim
1. A method for implementing a 12 volt automotive battery system, comprising:
- electrically coupling a first battery to an electrical system, wherein the first battery comprises a first battery chemistry;
electrically coupling a second battery and a first switch in parallel with the first battery to enable the first switch to selectively couple the second battery to the electrical system, wherein;
the second battery comprises a second battery chemistry that has a higher coulombic efficiency than the first battery chemistry; and
electrically coupling the second battery and the first switch in parallel with the first battery comprises electrically coupling the first switch between the second battery and the electrical system to enable the first switch to;
electrically connect the second battery to the electrical system during regenerative braking to enable the second battery to capture a majority of electrical power generated during regenerative braking; and
electrically disconnect the second battery from the electrical system during a period when regenerative braking is not occurring; and
electrically coupling a variable voltage alternator that outputs a first voltage during regenerative braking to charge the second battery and outputs a second voltage otherwise to the first switch, wherein the first voltage is higher than the second voltage; and
communicatively coupling battery control unit to the first battery, the second battery, the first switch the electrical system, the variable voltage alternator, or any combination thereof to enable the battery control unit to maintain the first battery generally at a full state of charge before regenerative braking to enable the first battery to steer the electrical power generated during regenerative braking to the second battery using internal resistance of the first battery.
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Abstract
A 12 volt automotive battery system includes a first battery coupled to an electrical system, in which the first battery include a first battery chemistry, and a second battery coupled in parallel with the first battery and selectively coupled to the electrical system via a first switch, in which the second battery includes a second battery chemistry that has a higher coulombic efficiency than the first battery chemistry. The first switch couples the second battery to the electrical system during regenerative braking to enable the second battery to capture a majority of the power generated during regenerative braking. The 12 volt automotive battery system further includes a variable voltage alternator that outputs a first voltage during regenerative braking to charge the second battery and a second voltage otherwise, in which the first voltage is higher than the second voltage.
47 Citations
15 Claims
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1. A method for implementing a 12 volt automotive battery system, comprising:
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electrically coupling a first battery to an electrical system, wherein the first battery comprises a first battery chemistry; electrically coupling a second battery and a first switch in parallel with the first battery to enable the first switch to selectively couple the second battery to the electrical system, wherein; the second battery comprises a second battery chemistry that has a higher coulombic efficiency than the first battery chemistry; and electrically coupling the second battery and the first switch in parallel with the first battery comprises electrically coupling the first switch between the second battery and the electrical system to enable the first switch to; electrically connect the second battery to the electrical system during regenerative braking to enable the second battery to capture a majority of electrical power generated during regenerative braking; and electrically disconnect the second battery from the electrical system during a period when regenerative braking is not occurring; and electrically coupling a variable voltage alternator that outputs a first voltage during regenerative braking to charge the second battery and outputs a second voltage otherwise to the first switch, wherein the first voltage is higher than the second voltage; and communicatively coupling battery control unit to the first battery, the second battery, the first switch the electrical system, the variable voltage alternator, or any combination thereof to enable the battery control unit to maintain the first battery generally at a full state of charge before regenerative braking to enable the first battery to steer the electrical power generated during regenerative braking to the second battery using internal resistance of the first battery. - View Dependent Claims (2, 3, 4, 5)
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6. A battery module, comprising:
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a positive terminal and a negative terminal configured to electrically couple the battery module to an electrical system of an automotive vehicle; a first plurality of battery cells electrically coupled between the positive terminal and the negative terminal, wherein each of the first plurality of battery cells comprises a first battery chemistry; a second plurality of battery cells electrically coupled to the negative terminal, wherein each of the second plurality of battery cells comprises a second battery chemistry that has a higher charge acceptance rate than the first battery chemistry; and a switching device electrically coupled between the second plurality of battery cells and the negative terminal, wherein the switching device is configured to; close while the automotive vehicle performs regenerative braking to enable the second plurality of battery cells to capture a majority of electrical power generated by an electrical generator during regenerative braking; and while the automotive vehicle is not performing regenerative braking; close to enable the second plurality of battery cells to supply electrical power to the electrical system when a first open circuit voltage across the second plurality of battery cells is greater than a voltage threshold; and open when the first open circuit voltage across the second plurality of battery cells is not greater than the voltage threshold. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification