Battery state-of-health determination upon charging
OwnerTina Shoa Hassani Lashidaniinventor
Life of this patent
Estimating the term…
Abstract
A rechargeable battery is charged and at the same time, steps are taken to assess its state of health. The state of charge is first estimated, then repeatedly measured and predicted during charging until its value converges to a reliable value. A further known state of charge is later determined, during or after the remainder of the charging. Using the two states of charge and the amount of charge supplied to the battery, the state of health is calculated based on the rated capacity of the battery.
Claims26
A method of determining state of health (SoH) of a battery of rated capacity C comprising the steps of:
- estimating an initial value of a state of charge (SoC) of the battery;
- starting to charge the battery;
- repeatedly measuring a voltage across terminals of the battery as the battery is charged;
- obtaining a converged value (SoCC) of the SoC from the repeated measurements;
- determining a later value (SoC2) of the SoC after further charging the battery;
- determining a charge (Q2) supplied to the battery between SoCC and SoC2;
- calculating, using SoC2, SoCC, Q2 and C, a value of the SoH of the battery.
A battery charger for determining state of health (SoH) of a battery of rated capacity C comprising:
- a battery interface that connects to the battery;
- a user interface;
- a processor connected to the battery interface and the user interface;
- a computer readable memory storing computer readable instructions, which, when executed by the processor, cause the battery charger to:
- estimate an initial value of a state of charge (SoC) of the battery;
- start to charge the battery;
- repeatedly measure a voltage across terminals of the battery as the battery is charged;
- obtain a converged value (SoCC) of the SoC from the repeated measurements;
- determine a later value (SoC2) of the SoC after further charging the battery;
- determine a charge (Q2) supplied to the battery between SoCC and SoC2;
- calculate, using SoC2, SoCC, Q2 and C, a value of the SoH of the battery;
- and
- output the calculated value of the SoH on the user interface.
Dependencies are inferred from the claim text.