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Battery capacity evaluation method

A technology of battery capacity and capacitance, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of inaccurate calculation of capacity, uncontrollable errors, etc., and achieve the effect of improving the estimation accuracy

Active Publication Date: 2014-03-26
SHENYANG JUNWEI NEW ENERGY TECH CO LTD
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Problems solved by technology

This method is relatively accurate at the battery pack’s nominal temperature and nominal discharge rate (or in an open circuit state); however, if the battery pack’s ambient temperature and charge-discharge rate change during operation, this method cannot be controlled by the application conditions. The error caused by the difference with the application environment leads to inaccurate capacity calculation

Method used

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  • Battery capacity evaluation method

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Embodiment Construction

[0015] Battery capacity evaluation method, including four steps: power-on capacity estimation, non-discharge end-stage charge-discharge capacity calculation, discharge end-stage capacity calculation, and full capacity update;

[0016] The power-on capacity estimation process is as follows: when the system is powered on, the power-on capacity estimation module checks the capacity ratio corresponding to the open-circuit voltage in the open-circuit voltage table (OCV_TABLE table) according to the detected open-circuit voltage value of a single battery , and multiply this capacity ratio by the design capacity to estimate the initial capacity of the battery when powered on;

[0017] Where OCV_TABLE is defined as follows:

[0018] struct OCV_TABLE OCV_LFP40_1=

[0019] {

[0020] {2000,2961,3170,3192,3203,3240,3259,3273,3280,3281,3282,3282,3283,3293,3320,3324,3324,3325,3325,3328,3500},

[0021] {0,5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100}

[0022]};

[0023...

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Abstract

The invention relates to a battery capacity evaluation method. When a system is powered on, a power-on capacity estimating module estimates the power-on initial capacity of a batter according to a detected single battery open circuit voltage value and by inquiring the capacity ratio, corresponding to the open circuit voltage, in an open circuit voltage meter; capacity of the battery is calculated through the current integration method when the battery is charged or discharged in the last stage of a non-discharging period, and meanwhile the module automatically conducts capacity correction on the temperature characteristic of the battery capacity according to a temperature departure linear correction table, knows the ratio of the capacity at the current temperature to the full capacity by inquiring the temperature departure linear correction table, and calculates the modified value of the current capacity; in the last stage of a discharging period, the battery capacity estimating module estimates the capacity of the battery in the last stage of the discharging period by inquiring a residual capacity table; in the last stage of the charging period, the full capacity is renewed according to the current value at present and the capacity value at present. According to the battery capacity evaluation method, the charging and discharging characteristics of the battery are taken into full consideration at different temperatures and different magnitudes of multiplying power, the capacity of the battery is estimated through the current integration method and the data table inquiring method, and calculation accuracy is improved.

Description

technical field [0001] The invention provides a method for estimating the charging and discharging capacity of the battery in an embedded situation. Background technique [0002] At present, the main estimation method of battery capacity is based on the voltage judgment method. This method is relatively accurate at the battery pack’s nominal temperature and nominal discharge rate (or in an open circuit state); however, if the battery pack’s ambient temperature and charge-discharge rate change during operation, this method cannot be controlled by the application conditions. The error caused by the difference with the application environment leads to inaccurate capacity calculation. Contents of the invention [0003] The main purpose of the present invention is to make up for the shortcomings of the above methods, fully consider the characteristics of the battery and the battery pack when the environment changes drastically, improve the calculation accuracy, and improve the...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 曾雪刚董丹朱晔王林波马鹏飞太超
Owner SHENYANG JUNWEI NEW ENERGY TECH CO LTD
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