US 11,808,819 B2
Real time backup battery life check
Thomas R. Thibodeau, Whitinsville, MA (US); Haijin Zhang, Fujian (CN); and Cui Xizhi, Shanghai (CN)
Assigned to DELL PRODUCTS L.P., Round Rock, TX (US)
Filed by Dell Products L.P., Round Rock, TX (US)
Filed on Oct. 21, 2021, as Appl. No. 17/507,658.
Prior Publication US 2023/0129347 A1, Apr. 27, 2023
Int. Cl. G01R 31/392 (2019.01); G01R 31/396 (2019.01); G01R 31/389 (2019.01); G01R 31/36 (2020.01)
CPC G01R 31/392 (2019.01) [G01R 31/389 (2019.01); G01R 31/396 (2019.01); G01R 31/3648 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A Backup Battery Unit (BBU) cell comprising:
a battery with an internal impedance;
monitoring circuitry connected to the battery for monitoring a Status of Health (SOH) of the battery, the monitoring circuitry comprising:
a MOSFET, a resistor, and a second resistor connected in series;
a master control unit (MCU) connected to the MOSFET for controlling the MOSFET and determining the SOH of the battery; and
wherein determining the SOH of the battery comprises calculating the internal impedance of the battery using a voltage across the resistor.