Device and method for protecting a battery
First Claim
1. A battery protection device for protecting a battery, said device comprising an electrical circuit arranged to generate or suppress a ripple current through said battery, wherein said electrical circuit comprises:
- a ripple generator arranged to produce an electrical ripple current;
a first ripple injector to be arranged on a positive power line to the battery, said first ripple injector being arranged to transfer said electrical ripple current to said positive power line;
a second ripple injector to be arranged on a negative power line to the battery, said second ripple injector being arranged to transfer said electrical ripple current to said negative power line,wherein each of said first and second ripple injectors is a transformer or a capacitor, said first and second injectors being arranged to operate in a differential mode,said battery protection device being arranged to operate in two modes, said modes being;
a ripple injector mode in which a ripple current is generated by said electric circuit and applied across said battery; and
a ripple suppression mode in which unwanted incoming ripple currents coming into said battery are measured, and a current with opposing sign is injected in said battery; and
a Battery Management Unit or a central hybrid controller arranged to control in which of the two modes the battery protection device operates and further to control settings of the protection device.
1 Assignment
0 Petitions
Accused Products
Abstract
A battery protection device for protecting a battery (1;41) comprises an electrical circuit arranged to generate or suppress a ripple current through said battery. Said electrical circuit comprises a ripple generator arranged to produce an electrical ripple current, a first ripple injector (21;48) to be arranged on a positive power line to the battery, said first ripple injector being arranged to transfer said electrical ripple current to said positive power line, and a second ripple injector (22;49) to be arranged on a negative power line to the battery. Said second ripple injector is arranged to transfer said electrical ripple current to said negative power line. Said first and second ripple injector are arranged to operate in a differential mode, e.g. opposite sign on injected current.
12 Citations
13 Claims
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1. A battery protection device for protecting a battery, said device comprising an electrical circuit arranged to generate or suppress a ripple current through said battery, wherein said electrical circuit comprises:
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a ripple generator arranged to produce an electrical ripple current; a first ripple injector to be arranged on a positive power line to the battery, said first ripple injector being arranged to transfer said electrical ripple current to said positive power line; a second ripple injector to be arranged on a negative power line to the battery, said second ripple injector being arranged to transfer said electrical ripple current to said negative power line, wherein each of said first and second ripple injectors is a transformer or a capacitor, said first and second injectors being arranged to operate in a differential mode, said battery protection device being arranged to operate in two modes, said modes being; a ripple injector mode in which a ripple current is generated by said electric circuit and applied across said battery; and a ripple suppression mode in which unwanted incoming ripple currents coming into said battery are measured, and a current with opposing sign is injected in said battery; and a Battery Management Unit or a central hybrid controller arranged to control in which of the two modes the battery protection device operates and further to control settings of the protection device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of protecting a battery, said method comprising a battery protection device generating or suppressing a ripple current through said battery, by:
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injecting a first ripple current on a positive power line to the battery via a first transformer or a first capacitor; injecting a second ripple current on a negative power line to the battery via a second transformer or a second capacitor, wherein said first and second ripple current have opposite sign, said method further comprising; operating in two modes, said modes including; a ripple injector mode in which a ripple current is generated by an electric circuit and applied across said battery; and a ripple suppression mode in which unwanted incoming ripple currents coming into said battery are measured, and a current with opposing sign is injected in said battery; controlling in which of the two modes the battery protection device operates; and controlling settings of the battery protection device.
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Specification