Facebook, Inc.

Facebook Technologies, LLC

Soheil Ebrahimzadeh

Pierluigi Sarti

A computer-implemented method for pulse charging rechargeable batteries may include (1) identifying a rechargeable battery, (2) estimating an age of the rechargeable battery, (3) calculating, based at least in part on the age of the rechargeable battery, a pulse parameter for pulse charging the rechargeable battery, and (4) pulse charging the rechargeable battery using the pulse parameter to prolong the useful life of the rechargeable battery. In some examples, the rechargeable battery may be a backup battery that supplies backup power to a power supply within a data-center rack. Various other methods, systems, and apparatus are also disclosed.

Apparatus, systems, and methods for pulse charging rechargeable batteries

A computer-implemented method for charging partial-use batteries may include (1) determining a discharge duration for a partial-use battery, (2) estimating an age of the partial-use battery, (3) calculating, based on the age, a partial charge voltage for the partial-use battery that will enable a discharge cycle of the partial-use battery to last for the discharge duration, and (4) floating the voltage of the partial-use battery at the partial charge voltage to prolong the partial-use battery's life. The partial-use battery may be a backup battery of a power supply that will experience a transition from a first power source to a second power source, the transition may be expected to last for a transitional duration, the backup battery may supply power to the power supply during the transition, and the discharge duration may be greater than or equal to the transitional duration. Various other methods, systems, and apparatus are also disclosed.

Apparatus, systems, and methods for charging partial use batteries

Several embodiments perform battery backup unit (BBU) degradation testing. For example, a BBU testing system can be coupled to or part of a BBU. The BBU testing system can discharge the BBU by engaging a variable load to the BBU. The BBU testing system can monitor a discharge energy consumption over time as the BBU discharges until the discharge energy consumption reaches a specified amount of energy. The BBU testing system can determine a discharge time for the discharge energy consumption to reach the specified amount of energy. The BBU testing system can then compute a degradation state of the BBU based on the discharge time.

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San Francisco, CA, United States of America

Soheil Ebrahimzadeh