Gm Global Technolgoy Operations, Inc.

Meixian Wang

Yue-Yun Wang

Ion C Halalay

Raghunathan K

Charles Weldon Wampler, Ii

Justin Bunnell

Houchun Xia

Niccolo Jimenez

A lithium metal oxide (LMO) cathode includes a current collector having a length defining a first end and a second end, a width, and a first side and a second side, LMO active material applied to the first side and the second side of the current collector such that the LMO active material applied to each respective side of the current collector has an inner face contiguous with the current collector and an outer face, and a plurality of channels extending widthwise across the cathode within the LMO active material applied to the first and second sides. The LMO active material on each current collector side can have a thickness of about 100 &#x3bc;m to about 400 &#x3bc;m. The channels on the same side of the current collector can be spaced apart by 0.1 mm to 10 mm. The channels can have widths of 10 &#x3bc;m to 60 &#x3bc;m.

Thick, flexible cathodes for lithium-ion batteries

A method for estimating a state of a battery pack using a controller having battery state estimator (BSE) logic includes receiving or delivering a constant baseline current via the battery pack. Current oscillations having time-variant frequency content are selectively injected into the baseline current via the controller in response to a predetermined condition. The baseline current and the current oscillations combine to form a final current. The method includes estimating a battery parameter via the BSE logic concurrently with the current oscillations to generate an estimated battery parameter, and estimating the present state of the battery pack via the controller using the estimated battery parameter. An electrical system includes a rotary electric machine that is electrically connected to and driven by the battery pack, and a controller configured to execute the method.

Battery state estimation using injected current oscillation

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Troy, MI, United States of America

Meixian Wang