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Energy Storage: Multi-battery Charge Equalization Circuits
Search All Applications in Energy Storage: Multi-battery Charge Equalization Circuits
Application US20190222037
Published 2019-07-18
System And Method For Battery Pack
A battery pack includes an arrangement of battery cells organized in battery groups connected in series, with each group having one or more battery units connected in parallel, and each battery unit comprising one or more series-connected battery cells connected to a battery switch. Charging of the battery pack uses pulse charging. The charging pulses provided to the battery units can be determined based on one or more measured characteristics of battery cells comprising the battery unit so that charging of the battery units can be optimized according to those characteristics. The charging pulses provided to each battery group are timed so that there is an uninterrupted flow of charging current through all the battery groups at all times.
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- 1. A system, comprising:
one or more battery units, wherein each battery unit comprises one or more battery cells; one or more switches that are operatively coupled to one or more battery units; and a controller configured to:
generate a plurality of pulsed switch signals to control the one or more switches, wherein:
each battery unit gets pulse charged, via a corresponding switch, based on a corresponding switch signal,
each pulsed switch signal corresponds to at least one of the one or more switches,
each pulsed switch signal comprises a series of pulses, each pulse having an ON time and an OFF time, which are dynamically determined based on one or more characteristics of a battery unit associated with the corresponding switch, and
the one or more characteristics are measured during the ON time of the pulse.
- 9. A method to charge a battery pack comprising one or more battery units and one or more switches, wherein each battery unit comprises one or more battery cells, and one or more switches are operatively coupled to the one or more battery units, the method comprising:
generate a plurality of pulsed switch signals to control the one or more switches, wherein: each battery unit gets pulse charged, via a corresponding switch, based on a corresponding switch signal, each pulsed switch signal corresponds to at least one of the one or more switches, each pulsed switch signal comprises a series of pulses, each pulse having an ON time and an OFF time, which are dynamically determined based on one or more characteristics of a battery unit associated with the corresponding switch, and the one or more characteristics are measured during the ON time of the pulse.
- 15. A controller to control a battery pack comprising one or more battery units and one or more switches, wherein each battery unit comprises one or more battery cells, wherein one or more switches are operatively coupled to the one or more battery units, and wherein the controller is configured to:
generate a plurality of pulsed switch signals to control the one or more switches, wherein: each battery unit gets pulse charged, via a corresponding switch, based on a corresponding switch signal, each pulsed switch signal corresponds to at least one of the one or more switches, each pulsed switch signal comprises a series of pulses, each pulse having ON time and OFF time, which are dynamically determined based on one or more characteristics of a battery unit associated with the corresponding switch, and the one or more characteristics are measured during the ON time of the pulse.
