Device for monitoring an electrical accumulation battery and associated method
AssigneesMichelin Recherche et Technique S.A., Compagnie Generale Des Etablissements Michelin
InventorsGino Paganelli, Thierry Auguet
Life of this patent
Estimating the term…
Abstract
A device is provided for monitoring an electrical accumulation battery that includes a set of cells connected in series. The device includes means for measuring a current intensity delivered by the battery; means for measuring an electrical voltage between an upstream connection point and a downstream connection point of each cell of the battery; a recorder that records a zero-current electrical voltage between the upstream connection point and the downstream connection point of each cell of the battery; and an electrical resistance estimator configured to periodically estimate an electrical resistance of each cell in the battery, between the upstream connection point and the downstream connection point.
Claims13
1-12. (canceled)
A device for monitoring an electrical accumulation battery that includes a plurality of cells connected in series, the device comprising:
- a current measurer, which measures a value of a current (I) delivered by the battery;
- a voltage measurer, which measures a value of an electrical voltage (Ui) between an upstream connection point and a downstream connection point of each cell of the battery;
- a recorder, which records a zero-current electrical voltage (U0i) between the upstream connection point and the downstream connection point of each cell, the zero-current electrical voltage (U0i) being recorded each time the value of the current (I) delivered by the battery reaches zero;
- and
- an electrical resistance estimator circuit, which periodically estimates an electrical resistance (Ri+Rci) of each cell, between the upstream connection point and the downstream connection point of the cell.
An electrical accumulation battery, comprising:
- a plurality of cells connected in series;
- and
- a monitoring device that includes:
- a current measurer, which measures a value of an output current (I),
- a voltage measurer, which measures a value of an electrical voltage (Ui) between an upstream connection point and a downstream connection point of each cell,
- a recorder, which records a zero-current electrical voltage (U0i) between the upstream connection point and the downstream connection point of each cell, the zero-current electrical voltage (U0i) being recorded each time the value of the output current (I) reaches zero, and
- an electrical resistance estimator circuit, which periodically estimates an electrical resistance (Ri+Rci) of each cell, between the upstream connection point and the downstream connection point of the cell,
- wherein, for each cell except a first cell and a last cell of the plurality of cells, the upstream connection point of the cell is also the downstream connection point of an adjacent cell.
A method for monitoring a plurality of cells of an electrical accumulation battery, the method comprising steps of:
- measuring a voltage (Ui) between an upstream connection point and a downstream connection point of each cell of the battery at regular time intervals;
- measuring a current (I) delivered by the battery simultaneously with the measuring of the voltage (U);
- calculating, for each cell of the battery, an electrical resistance (Ri+Rci) between the upstream connection point and the downstream connection point, wherein the calculating includes dividing a voltage differential, which is a difference between the voltage (Ui) and a zero-current voltage (U0i), by the current (I) delivered by the battery, and wherein the zero-current voltage (U0i) of each cell is re-estimated each time the current (I) delivered by the battery reaches zero.
Dependencies are inferred from the claim text.