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

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

Example Embodiment

[0157] Example 1 Determination of battery 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 automotive industry standard QC / T743-2006 "Lithium-ion Battery for Electric Vehicles" the 20℃ discharge capacity detection method, according to the charge 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 use the battery test system for 10 cycles of charging and discharging. The charging conditions are in accordance with the charging system specified by the battery manufacturer, and the discharge is carried out at a constant current of 20A for 35 minutes. Then measure the battery capacity according to the above-mentioned 20℃ discharge capacity detection method and calculate the attenuation coefficient η age . Change the number of charge and discharge...

Example Embodiment

[0159] Example 2 Battery SOC measurement results under constant current discharge conditions

[0160] Take a nominal 2.4V, rated capacity of 10Ah lithium-ion power battery, cycle charge and discharge times not more than 10 times, in an electric vehicle laboratory at an ambient temperature of 20 ℃, 1C constant current discharge experiment, the discharge time is 30 minutes , It has been allowed to stand at ambient temperature for more than 2 hours before the experiment. The measured terminal voltage of the battery is 2.493V. Check the SOC=80% corresponding to the OCV-SOC graph. Take SOC 0 =80%, two sets of identical BMS are used to monitor the discharge status of the battery at the same time. One set adopts the SOC measurement method provided by the present invention. Since the number of cycles of charging and discharging of the battery is not more than 10, η can be taken age =1.1; and take a 20-minute period to calculate the average capacity correction coefficient. The other set...

Example Embodiment

[0161] Example 3 Battery SOC measurement results under variable current discharge conditions

[0162] Take a nominal 2.4V, a rated capacity of 10Ah, a lithium-ion power battery that has been charged and discharged 200 times and is fully charged. In the electric vehicle laboratory, the discharge experiment under variable current conditions at an ambient temperature of 20°C is carried out. See the table below for current and duration. Two sets of exactly the same BMS are used to monitor the discharge of the battery at the same time, one set adopts the SOC measurement method provided by the present invention, and η age =1.0; and take the 30s time period to calculate the average capacity correction coefficient. All parameters are automatically selected by BMS based on real-time measured temperature and discharge current data and used for SOC calculation.

[0163] Serial number

[0164] After the discharge is over, the method provided by the present invention finally shows SOC=36.7...

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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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