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Method for measuring storage battery residual capacity SOC

A technology of remaining capacity and storage battery, applied in the direction of measuring electric variables, measuring electricity, measuring devices, etc., can solve the problem of large error accumulation of battery remaining capacity SOC calculation error and so on

Inactive Publication Date: 2016-07-13
ZHEJIANG ANMEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] The present invention solves the problem of large SOC calculation error and error accumulation in the existing ampere-hour integral method technology

Method used

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  • Method for measuring storage battery residual capacity SOC
  • Method for measuring storage battery residual capacity SOC
  • Method for measuring storage battery residual capacity SOC

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] The mensuration of embodiment 1 accumulator attenuation coefficient

[0158] Take a newly manufactured lithium-ion power battery with a nominal 2.4V and a rated capacity of 10Ah. According to the detection method of the discharge capacity at 20°C in the automotive industry standard QC / T743-2006 "Lithium-ion Batteries for Electric Vehicles", according to the charging cut-off voltage is 2.75V, the discharge cut-off voltage is 1.5V, measure the actual capacity of the battery, and calculate the attenuation coefficient η according to formula (2) age . Then it was charged and discharged 10 times with the battery test system. The charging conditions were according to the charging system specified by the battery manufacturer, and the discharging was performed at a constant current of 20A for 35 minutes. Then measure the capacity of the storage battery according to the detection method of the discharge capacity at 20°C above and calculate the attenuation coefficient η age . C...

Embodiment 2

[0159] Battery SOC measurement results under the constant current discharge condition of embodiment 2

[0160] Take a lithium-ion power battery with a nominal 2.4V and a rated capacity of 10Ah, and charge and discharge cycles no more than 10 times. Conduct a 1C constant current discharge test in the electric vehicle laboratory at an ambient temperature of 20°C, and the discharge time is 30 minutes. , had been left to stand at ambient temperature for more than 2 hours before the experiment. The measured terminal voltage of the storage battery is 2.493V, and the SOC=80% corresponding to the OCV~SOC curve is checked. Take SOC 0 =80%, use two sets of completely identical BMS to monitor the battery discharge status simultaneously, and one set adopts the SOC measuring method provided by the present invention, because the battery cycle charge and discharge times are not more than 10 times, so it is desirable to take η age= 1.1; and take a 20-minute time period to calculate the aver...

Embodiment 3

[0161] Battery SOC measurement results under the condition of variable current discharge in embodiment 3

[0162] Take a lithium-ion power battery with a nominal 2.4V, a rated capacity of 10Ah, and a fully charged lithium-ion power battery that has been charged and discharged 200 times in the electric vehicle laboratory. See the table below for current and duration. Monitor the discharge situation of storage battery simultaneously with two sets of completely identical BMS, one set adopts the SOC measurement method that the present invention provides, gets η age =1.0; and take a 30s time period to calculate the average capacity correction coefficient. All parameters are automatically taken by BMS according to the real-time measured temperature and discharge current data and used for SOC calculation.

[0163] serial number

[0164] After the discharge, the method provided by the present invention finally shows SOC=36.7%; the traditional ampere-hour integration method...

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Abstract

The invention provides an accurate and convenient method for measuring storage battery residual capacity SOC. The method comprises the steps that a. initial residual capacity SOC<0> of a storage battery is determined; b. working current of the storage battery in the working time is measured in real time; c. residual capacity SOC(t) of the storage battery after continuous working time t is calculated according to the formula 1 (which is expressed in the specification), wherein eta<age> refers to the attenuation coefficient of the storage battery, C<n> refers to the rated capacity of the storage battery, eta<e> refers to the current efficiency coefficient, eta refers to the correction coefficient of the actual capacity of the storage battery, and t refers to continuous working time of the storage battery; and d. after the end of working of the storage battery, eta=1, and the SOC value calculated according to the formula 1 is the SOC value after the end of working of the storage battery of the time, wherein eta<age> refers to the specific value of the actual capacity to the rated capacity of the storage battery after N times of cyclic charge and discharge of the storage battery, C<n> refers to the electric energy which can be discharged by charging to cut-off voltage, eta<e> refers to the specific value of actual current used for electrode reaction to external current in charge and discharge of the storage battery, and eta refers to the specific value of actual capacity which can be charged or discharged by the storage battery to the rated capacity under the actual use state.

Description

technical field [0001] The invention relates to a storage battery management system, more specifically to a method for measuring the remaining capacity (SOC) of a storage battery, which belongs to the technical field of batteries. Background technique [0002] A battery is a device that converts chemical energy into electrical energy, also known as a chemical power source. After the battery is discharged, the active material inside the battery can be regenerated by charging, the electrical energy is stored as chemical energy, and the electrical energy is released when necessary. This type of battery is called a storage battery, also known as a secondary battery. [0003] As an energy storage device, the battery has a wide range of uses, whether in the field of life or in the field of production, ranging from mobile phones and laptops in people's hands to spaceships and ocean-going ships. fields are of great importance. [0004] There are many types of storage batteries, a...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/3648G01R31/387
Inventor 莫一平张晓忠褚有群
Owner ZHEJIANG ANMEI TECH CO LTD
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