Single Fuel Gauge for Multiple Energy Storage Devices

摘要

A multiple energy storage device fuel gauge is described for a device having a power system with multiple heterogeneous energy storage devices. The fuel gauge keeps track of a present state of multiple heterogeneous energy storage devices simultaneously. The fuel gauge implements collective measurement of voltage and current of the multiple heterogeneous energy storage devices via shared circuitry to determine status information, such as state of charge (SOC) and internal resistance values. A controller of the fuel gauge uses various measurements and energy storage device-specific parameters to compute status values indicative of the state of each energy storage device. The status values are maintained by the fuel gauge and exposed to other system components to facilitate power management decisions. A communication bus is used to communicate between the fuel gauge and system components, and a software API may be exposed to facilitate access to various energy storage device specific information.

主权项

1. A client computing device powered at least in part by energy storage devices, the client computing device comprising:
two or more heterogeneous energy storage devices included with the client computing device; a fuel gauge included in the client computing device and attached to the two or more energy storage devices, the fuel gauge including:
storage to maintain state of charge (SOC) estimation parameters for each of the energy storage devices attached to the fuel gauge, each of the SOC estimation parameters corresponding to characteristics of the respective energy storage devices;a controller connected via shared circuitry to each of the energy storage devices attached to the fuel gauge, the controller operable to:
measure values indicative of a status of each of the energy storage devices attached to the fuel gauge; andupdate status information corresponding to each of the energy storage devices attached to the fuel gauge based on the measured values and the SOC estimation parameters.