Low temperature fast charge

摘要

An automated charge preparation method periodically determines critical parameters for the set of relevant operating conditions, determines whether fast charging is possible, applies fast charging when possible, otherwise applies a dynamically scaled charging rate that is optimized based upon current critical parameters (while optionally heating the individual battery cells as long as fast charging is not available) to reduce/eliminate a risk of lithium-plating.

主权项

1. An automated charge preparation method for a plurality of intercoupled energy storage elements having a risk responsive to application of a first charging process to the plurality of intercoupled energy storage elements under a set of predefined conditions, the method comprising the steps of:
(a) determining periodically, using a microprocessor, a periodic set of critical parameters for the set of predefined conditions of the plurality of intercoupled energy storage elements; (b) determining periodically, using the microprocessor and responsive to an evaluation of said periodic set of critical parameters, whether the first charging process may be applied to the plurality of intercoupled energy storage elements without the risk; and thereafter (c) charging the plurality of intercoupled energy storage elements using the first charging process whenever said determining step b) determines that the first charging process may be applied to the plurality of intercoupled energy storage elements without the risk; and (d) charging the plurality of intercoupled energy storage elements using a second charging process that may be applied to the plurality of intercoupled energy storage elements without the risk whenever said determining step b) does not determine that the first charging process may be applied to the plurality of intercoupled energy storage elements without the risk; (e) modifying said periodic set of critical parameters to increase said second energy transfer rate by operating on the plurality of energy storage cells during said charging step (d) wherein said second charging process has a second energy transfer rate slower than a first energy transfer rate associated with the first charging process; and wherein said second charging process dynamically scales said second energy transfer rate responsive to said periodic set of critical parameters.