Current estimation chip, estimation method and remaining power measurement system for battery

Abstract

The invention relates to a current estimating chip and estimating method for cells, and a remaining electric quantity metering system for cells. The current estimating chip includes a temperature compensating module, a cell state determination module and a computing module, wherein the temperature compensating module is used for receiving temperature information of cells, and compensating the internal resistance rdc of the cells according to the temperature information of the cells; the cell state determination module is used for receiving cell voltage vbat, and determining the state of the cells according to the changing situation of the cell voltage vbat; and the computing module is used for estimating the current of the cells according to the cell voltage vbat, the cell state and the cell internal resistance rdc. The current estimating chip and estimating method for cells can realize accurate estimation of the cell current without using a current sampling resistor, can accurately estimate the cell current even in occasions with big current, low temperature and the like, and are low in the hardware system cost.

Description

technical field [0001] The invention relates to the field of chip technology, in particular to a current estimation chip for batteries. The invention also relates to a current estimation method for the battery and a remaining power measurement system for the battery. Background technique [0002] At present, with the popularization of electronic products such as smart wearables and smart terminals, the accurate display of the remaining battery power has become an important performance indicator of related products. If the remaining battery power cannot be accurately displayed, on the one hand, it will affect the user experience, such as uneven power usage, shutdown when there is still a lot of power, and insufficient charging; on the other hand, it will also affect the utilization limit of battery power. [0003] Whether the display of the remaining battery power is accurate depends on whether the measurement of the remaining battery power is accurate; and whether the measu...

AI Technical Summary

Problems solved by technology

However, usually due to the algorithm, the existing measurement methods cannot accurately determine the state of the battery, such as static, charging, discharging and other different states, and do not consider factors such as the influence of temperature on the battery current, resulting in inaccurate calculation of the battery current. Furthermore, it is impossible to guarantee the accuracy of the calculation result of the remaining power, and the user will find that the power changes abnormally when using it, and the experience is poor.

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