Abstract: Disclosed herein are methods, systems, and devices for determining a state-of-health (SOH) of battery systems over extended temperatures. According to one embodiment, a computer implemented method includes (1) receiving measured temperature data and measured ohmic value data associated with a battery cell; (2) determining an estimated battery cell electrolyte temperature based on the measured temperature data; (3) determining a normalized ohmic value based on the measured ohmic value data and the estimated battery cell electrolyte temperature, wherein the normalized ohmic value is related to a normalized temperature; and (4) transmitting, to at least one of a graphical user interface (GUI) and a battery log, an indication of an SOH of the battery cell based upon the normalized ohmic value being greater than a normalized maximum ohmic value, wherein the normalized maximum ohmic value is indicative of an abnormal SOH of the battery cell for the normalized temperature.

Abstract: Disclosed herein are methods, systems, and devices for determining a state-of-health (SOH) of battery systems over extended temperatures. According to one embodiment, a computer implemented method includes (1) receiving measured temperature data and measured ohmic value data associated with a battery cell; (2) determining an estimated battery cell electrolyte temperature based on the measured temperature data; (3) determining a normalized ohmic value based on the measured ohmic value data and the estimated battery cell electrolyte temperature, wherein the normalized ohmic value is related to a normalized temperature; and (4) transmitting, to at least one of a graphical user interface (GUI) and a battery log, an indication of an SOH of the battery cell based upon the normalized ohmic value being greater than a normalized maximum ohmic value, wherein the normalized maximum ohmic value is indicative of an abnormal SOH of the battery cell for the normalized temperature.

Abstract: Reducing or avoiding noise in measured signals of a tested battery cell(s) in a battery power system is disclosed. A battery monitoring device(s) coupled to a tested battery cell(s) applies test current pulses at a predetermined frequency to place an effective alternating current (AC) load on the tested battery cell(s). The resulting AC voltage signal generated across the tested battery cell(s) is sampled at the frequency of the test current to convert the AC voltage signal to a direct current (DC) voltage signal to be measured to determine the state-of-health of the tested battery cell(s). To avoid or reduce noise in the DC voltage signal, a noise spectrum of noise signals at defined frequencies induced on the tested battery cell(s) is determined. The battery monitoring device sets the frequency of the test current pulse at a determined reduced-noise frequency to avoid noise signals being present in the DC voltage signal.

Abstract: Reducing or avoiding noise in measured signals of a tested battery cell(s) in a battery power system is disclosed. A battery monitoring device(s) coupled to a tested battery cell(s) applies test current pulses at a predetermined frequency to place an effective alternating current (AC) load on the tested battery cell(s). The resulting AC voltage signal generated across the tested battery cell(s) is sampled at the frequency of the test current to convert the AC voltage signal to a direct current (DC) voltage signal to be measured to determine the state-of-health of the tested battery cell(s). To avoid or reduce noise in the DC voltage signal, a noise spectrum of noise signals at defined frequencies induced on the tested battery cell(s) is determined. The battery monitoring device sets the frequency of the test current pulse at a determined reduced-noise frequency to avoid noise signals being present in the DC voltage signal.

Abstract: Embodiments disclosed include automatically determining alarm threshold settings for monitored battery cells in battery systems. Battery monitoring control units are provided that are configured to initiate battery performance tests (e.g., ohmic tests) on battery cells in a battery system. Failing battery cells are identified as those battery cells having battery performance characteristics outside defined battery performance threshold settings. An initial performance alarm threshold setting is established for each battery cell because of unique performance characteristics that can substantially change during initial charging cycles before the battery cells have settled. A settled performance alarm threshold setting specific to each battery cell is then established based on battery cell performance during the defined settling time period.

Abstract: Embodiments disclosed include automatically determining alarm threshold settings for monitored battery cells in battery systems. Battery monitoring control units are provided that are configured to initiate battery performance tests (e.g., ohmic tests) on battery cells in a battery system. Failing battery cells are identified as those battery cells having battery performance characteristics outside defined battery performance threshold settings. An initial performance alarm threshold setting is established for each battery cell because of unique performance characteristics that can substantially change during initial charging cycles before the battery cells have settled. A settled performance alarm threshold setting specific to each battery cell is then established based on battery cell performance during the defined settling time period.