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Method and device for metering residual electric quantity of lithium ion battery

A technology for lithium-ion batteries and remaining power, which is applied in measuring devices, measuring electrical variables, measuring electricity, etc., can solve problems such as poor stability and low accuracy of lithium-ion batteries, and achieve high real-time performance and simple structure.

Active Publication Date: 2017-02-15
SHANGHAI GREEN EAR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these evaluations based on the charge accumulation method and the open circuit voltage method cannot fundamentally solve the inherent defects of the method, resulting in low accuracy and poor stability of the remaining power measurement of lithium-ion batteries

Method used

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  • Method and device for metering residual electric quantity of lithium ion battery
  • Method and device for metering residual electric quantity of lithium ion battery
  • Method and device for metering residual electric quantity of lithium ion battery

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Embodiment Construction

[0024] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

[0026] The essence of the existing lithium-ion battery remaining power measurement method is to estimate indirectly through the measured values ​​of state variables such as voltage and current, so its measurement accuracy is limited.

[0027] Embodiments of the present invention describe a method for measuring the remaining power of a lithium-ion battery, which can directly measure the remaining power of the lithium-ion battery as a physic...

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Abstract

The invention provides a method and device for metering the residual electric quantity of a lithium ion battery. The method includes the steps of performing pulse discharging on the lithium ion battery under discharging current in discharging time; obtaining a voltage difference between when the lithium ion battery is not subjected to pulse discharging and when the lithium ion battery is subjected to pulse discharging; and obtaining the residual electric quantity of the lithium ion battery according to the abovementioned voltage difference.

Description

technical field [0001] The invention mainly relates to the technical field of measuring the remaining power of a lithium-ion battery, in particular to a method and a device for measuring the remaining power of a lithium-ion battery. Background technique [0002] With the popularity of mobile communication products such as smartphones and notebook computers, the development of electric vehicles, and the needs of solar battery applications, before better batteries appear, lithium-ion batteries, as a high-energy secondary battery, will have unique advantages. It will be widely used for a long time. In many applications, it is necessary to know the remaining power of the Li-ion battery in real time to estimate the usable time of the battery. [0003] At present, the known methods for measuring the remaining power of lithium-ion batteries mainly include the charge accumulation method and the open circuit voltage method. The charge accumulation method estimates the remaining bat...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/3648G01R31/3842G01R31/36
Inventor 鲍公舜
Owner SHANGHAI GREEN EAR TECH CO LTD