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Method for estimating battery capacity state

A technology of battery power and state of charge, applied in the field of estimation, can solve problems such as driving safety

Active Publication Date: 2020-06-16
STL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the battery is used in an electric vehicle, the electric vehicle may also stop driving without warning due to errors in state of charge (SOC) estimation, resulting in driving safety issues

Method used

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  • Method for estimating battery capacity state
  • Method for estimating battery capacity state
  • Method for estimating battery capacity state

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Experimental program
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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0027] see figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 , are respectively the schematic diagram of the circuit structure of the electronic device of the present invention, the flow chart of the method for estimating the state of battery power of the present invention, the flow chart of the procedure for adjusting the residual capacity of the battery during discharge of the present invention, the graph of the voltage and state of charge of the battery of the present invention, and Flowchart of the procedure for correcting the residual capacity of the battery at rest in the present invention. Such as figure 1 As shown, the electronic device 100 of the present invention can also be an electric vehicle, a hand-held electronic device or a device with a battery as the main power s...

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Abstract

The invention provides a method for estimating a battery capacity state. The method is characterized by when a current of a battery is less than zero, inquiring a contrasted reference electric quantity state from a lookup table according to a detected battery voltage; subtracting a voltage threshold value from the battery voltage to obtain a voltage difference; dividing a current electric quantitystate by the voltage difference to obtain a first slope; dividing the reference electric quantity state by the voltage difference to obtain a second slope; dividing the first slope by the second slope to obtain an adjustment proportion; using a coulomb counting method to count a charge capacity of battery discharge so as to calculate a discharge counting capacity; and multiplying the discharge counting capacity by the adjustment ratio to obtain an adjustment value, subtracting the adjustment value from a previously recorded residual capacity to obtain a new residual capacity, and dividing thenew residual capacity by a full charge capacity to estimate a new battery capacity state.

Description

technical field [0001] The present invention relates to a method for estimating, in particular to a method for estimating the state of charge of a battery. Background technique [0002] With the evolution of battery technology, a battery is installed in many electronic devices at present, so as to use the power stored in the battery to provide the energy required for the operation of the electronic device. Furthermore, the power stored in the battery will gradually decrease with the operation of the electronic device. In order to prevent the power stored in the battery from being completely exhausted and the electronic device to stop running without warning, the electronic device itself usually monitors the power status of the battery. (State of Charge, SOC) for estimation. The state of charge (SOC) of the battery can also be defined as the state of the available electric energy in the battery, which is usually expressed as a percentage, for example, SOC=remaining capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/382G01R31/387G01R31/3842
CPCG01R31/3648G01R31/3842G01R31/367G01R31/382G01R19/16542
Inventor 伍崇永
Owner STL TECH