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Method and device for detecting lithium battery power

A technology of power detection and lithium battery, which is applied in measuring devices, secondary batteries, measuring electrical variables, etc., and can solve the problem of high cost of special chips

Active Publication Date: 2016-12-28
BEIJING AEONMED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of the segmented voltage detection method is that the terminal voltage of the battery is often used as the standard for judging the remaining capacity of the battery when the capacity interval is relatively thick (10% or 20% of a grid).
The disadvantage of this detection method is that the cost of the dedicated chip is high, and it is only for batteries with a fixed number of cells.

Method used

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  • Method and device for detecting lithium battery power
  • Method and device for detecting lithium battery power
  • Method and device for detecting lithium battery power

Examples

Experimental program
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Effect test

no. 1 example

[0018] In the first embodiment, the following method is used to detect the electric quantity of the lithium battery:

[0019] The first step is to calibrate the battery, and the total power Q of the battery is calculated by the data acquisition and processing module S And the value of the calibration parameter of each sampling point obtained through sampling is stored in the data storage unit;

[0020] The second step is to use the calibrated battery normally, and collect the battery current I and the real-time parameter value of the calibration parameter in real time through the data acquisition and processing module, and use the integral calculation of the current I and time to obtain the real-time consumed power Q;

[0021] The third step is to compare the real-time parameter value with the corresponding calibration parameter value. If the difference between the real-time parameter value and the corresponding calibration parameter value is less than the preset value, the t...

no. 2 example

[0028] In the second embodiment, the following method is used to detect the electric quantity of the lithium battery:

[0029] The first step is to calibrate the battery, using a constant current I 0 The method of discharging the battery is carried out, as attached figure 2 As shown, until the end of discharge, the total battery power value Q is obtained S , Q S = I 0 T, where T is the time spent until the end of discharge. The discharge time is segmented, and a sampling point is selected for each stage. The total power Q of the battery is calculated by the data acquisition and processing module S And the value of the calibration parameter of each sampling point obtained through sampling is stored in the data storage unit, and the calibration parameter value includes the measured value of the battery voltage, and its measured value is marked as U during the calibration process. c ; and the calculated value of the remaining battery power, which is recorded as Q in the ca...

no. 3 example

[0039] In the third embodiment, the following method is used to detect the electric quantity of the lithium battery:

[0040] The first step is to calibrate the battery, as attached figure 2 shown, using a constant current I 0 The method of discharging the battery is carried out until the end of the discharge to obtain the total battery power value Q S , Q S =I 0 T, where T is the time spent until the end of discharge. The discharge time is segmented, and a sampling point is selected for each stage. The total power Q of the battery is calculated by the data acquisition and processing module S And the value of the calibration parameter of each sampling point obtained through sampling is stored in the data storage unit, and the calibration parameter value includes the measured value of the battery voltage, and its measured value is marked as U during the calibration process. c ; and the calculated value of the remaining battery power, which is recorded as Q in the calibra...

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Abstract

The invention discloses a lithium-battery electric-quantity accurate detection method and device. The method includes the following steps: step1: calibrating a cell and storing a total electricity quantity QS of the cell and a calibration parameter value of each sampling point, which is obtained through sampling, into a data storage unit through a data acquisition processing module; step2: using normally the calibrated cell and acquiring cell current I and real-time parameter values of the calibration parameters in a real-time manner through the data acquisition processing module and obtaining an electricity quantity Q consumed in a real-time manner through an integral operation of the current I and the time; step3: comparing the real-time parameter values and corresponding calibration parameter values and if the difference value of each real-time parameter value and a corresponding calibration parameter value is smaller than a preset value, using the difference value Delta Q of the total electricity quantity QS and the electricity quantity Q consumed in a real-time manner as the real-time remaining electricity quantity of the cell; and if the difference value of the real-time parameter value and a corresponding calibration parameter value is larger than the preset value, repeating the above-mentioned steps.

Description

technical field [0001] The invention relates to the technical field of lithium battery power measurement, in particular to a lithium battery power detection method and a device thereof. Background technique [0002] The detection of lithium battery power is generally adopted at present by segment voltage detection method and special chip detection method. [0003] The segmented voltage detection method uses the relationship curve between the voltage and the power obtained by pre-sampling the battery voltage in segments according to AD, by measuring the voltage of the battery, and referring to the original curve, the battery power can be estimated. However, the disadvantage of the segmented voltage detection method is that the terminal voltage of the battery is often used as a criterion for judging the remaining capacity of the battery when the capacity interval is relatively thick (10% or 20% of a grid). However, due to the characteristics of the battery itself, the impact ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36H01M10/48A61M16/01A61M16/00
CPCY02E60/10
Inventor 祁业鹏
Owner BEIJING AEONMED
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