State-of-charge balancing in battery management systems for si/li batteries
AssigneeEnevate Corporation
InventorsSamuel Keene, Benjamin Yong Park, Samer Saab
Life of this patent
Estimating the term…
Abstract
Systems and methods are provided for state-of-charge balancing in battery management systems for Si/Li batteries. State-of-charge (SOC) of one or more lithium-ion cells may be assessed, and based on the assessing of the SOC, the one or more lithium-ion cells may be controlled. The controlling may include setting or modifying one or more operating parameters of at least one lithium-ion cell, and the controlling may be configured to equilibrate the SOC of the one or more lithium-ion cells or to modify an SOC of at least one lithium-ion cell so that the one or more lithium-ion cells have a balanced SOC.
Claims30
A method for managing a battery pack comprising a plurality of lithium-ion cells, the method comprising:
- assessing state-of-charge (SOC) of the plurality of lithium-ion cells;
- and
- controlling, based on the assessing of state-of-charge (SOC), the plurality of lithium-ion cells;
- wherein one or more of the plurality of lithium-ion cells are silicon/lithium (Si/Li) cells;
- wherein assessing the state-of-charge (SOC) comprises calculating the state-of-charge (SOC) using one or more state-of-charge (SOC) models that account for one or more characteristics that are associated with silicon/lithium (Si/Li) cells;
- wherein the one or more characteristics comprise one or both of open circuit voltage (OCV) hysteresis and nonlinear time-dependent transition in the OCV during transitions between charge to discharge states;
- and
- wherein the controlling is configured to equilibrate the state-of-charge (SOC) of the plurality of lithium-ion cells, or to modify a state-of-charge (SOC) of an individual lithium-ion cell or groups of lithium-ion cells so that the plurality of lithium-ion cells as a whole has a balanced state-of-charge (SOC).
A system comprising:
- a plurality of lithium-ion cells;
- and
- one or more circuits configured to:
- assess state-of-charge (SOC) of the plurality of lithium-ion cells;
- and
- control, based on the assessing of state-of-charge (SOC), the plurality of lithium-ion cells;
- wherein one or more of the plurality of lithium-ion cells are silicon/lithium (Si/Li) cells;
- wherein assessing the state-of-charge (SOC) comprises calculating the state-of-charge (SOC) using one or more state-of-charge (SOC) models that account for one or more characteristics that are associated with silicon/lithium (Si/Li) cells;
- wherein the one or more characteristics comprise one or both of open circuit voltage (OCV) hysteresis and nonlinear time-dependent transition in the OCV during transitions between charge to discharge states;
- and
- wherein the controlling is configured to equilibrate the state-of-charge (SOC) of the plurality of lithium-ion cells or to modify a state-of-charge (SOC) of an individual lithium-ion cell or groups of lithium-ion cells so that the plurality of lithium-ion cells as a whole has a balanced state-of-charge (SOC).
Dependencies are inferred from the claim text.