Method of detecting state-of-charge of battery and power device

Abstract

A method of detecting a state-of-charge of a battery detects a current of a battery and a voltage of the battery, calculating a state-of-charge of the battery as a first state-of-charge based on an integration of the current of the battery thus detected, while calculating the state-of-charge of the battery as a second state-of-charge based on the voltage of the battery and calculating a synthetic state-of-charge obtained by taking a weighted mean of the first state-of-charge and the second state-of-charge as the state-of-charge of the battery, and weighting the weighted mean in order to increase weighting of the second state-of-charge in a region in which a capacity of the battery is increased and a region in which the capacity of the battery is reduced and to increase weighting of the first state-of-charge in other regions.

Description

technical field [0001] The present invention relates to a method and a power supply device for detecting the remaining capacity of a battery, for example, to a method for detecting the remaining capacity of a battery included in a power supply device for driving a motor for driving a vehicle, and a power supply device. Background technique [0002] In the power supply device, the output battery can be increased by increasing the number of batteries or power supply modules in which cells are connected in series or parallel, and the output voltage can be increased by using the number of series connected cells. In particular, for applications requiring a large output, for example, in power supply devices used in vehicles such as automobiles, bicycles, and tools, a configuration in which a plurality of batteries are connected in series to increase the output can be adopted. For example, the high-current and high-output power supplies used in power supply devices for vehicles tha...

AI Technical Summary

Problems solved by technology

The remaining capacity of the battery changes due to the memory effect, so the exact remaining capacity of the battery cannot be estimated

If the residual capacity is incorrectly detected, an excessive load may be applied during charging and discharging of the battery, which may significantly reduce the battery life.

Also, on the other hand, the residual capacity changes due to the discharge of the battery itself

Due to these factors, it is very difficult to estimate the residual capacity of the battery, and it is extremely difficult to grasp the accurate residual capacity.

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