초록 ▼

A method of testing one or more cells and parameterising the results in order to obtain a characteristic curve/function from which cell discharge reserve time can be predicted from cell voltage. The test involves obtaining a plurality of data points representing the voltage of a cell as a function o

A method of testing one or more cells and parameterising the results in order to obtain a characteristic curve/function from which cell discharge reserve time can be predicted from cell voltage. The test involves obtaining a plurality of data points representing the voltage of a cell as a function of charge remaining, and parameterising the data points to obtain a function representing cell voltage and charge remaining. The function allows charge remaining to be calculated from cell voltage. The invention also provides for a device for measuring capacity and predicting discharge reserve time of a cell, the device including a voltage and current measuring means adapted to measure the voltage and load current of a cell. The device also includes a timing means so that a number of voltage and current data points can be obtained with respect of time. The data points are parameterised and the device produces a function relating charge remaining to cell voltage whereby the charge remaining can be determined by measuring the cell voltage.

대표청구항 ▼

1. A method of calculating the discharge reserve time of one or more test cells including the steps of:obtaining a plurality of data points representing the direct relationship between voltage and charge remaining during an initial discharge of one or more nominal cells; parameterising the data poin

1. A method of calculating the discharge reserve time of one or more test cells including the steps of:obtaining a plurality of data points representing the direct relationship between voltage and charge remaining during an initial discharge of one or more nominal cells; parameterising the data points to obtain a function representing charge remaining as a function of a single voltage variable, the function terminating at an end voltage corresponding substantially to a voltage level at which the nominal cell(s) is/are considered to be exhausted; estimating charge remaining directly from the cell voltage of said test cell(s) during a discharge in accordance with said function; and calculating the discharge reserve time of said test cell(s) from said estimated charge remaining.