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Judgment method of soc usage range of vehicle power battery pack

A technology for power battery packs and determination methods, which is applied in the directions of measuring electricity, measuring electrical variables, measuring devices, etc., which can solve the impact, cannot obtain the SOC usage interval of the battery pack, and cannot know the SOC usage interval of the nickel-metal hydride power battery pack for HEV, etc. problem, to achieve the effect of prolonging the service life and simple operation

Active Publication Date: 2017-02-22
湖南科霸汽车动力电池有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing evaluation method for the SOC usage interval of the nickel-hydrogen power battery pack for HEV is to monitor and manage the SOC usage interval through the BMS. However, the SOC estimation error is affected by factors such as usage time, temperature, and current, making it impossible to obtain a relatively accurate The SOC usage range of the battery pack, which affects the fact that the current vehicle manufacturers and battery factories cannot know the SOC usage range of the nickel-metal hydride power battery pack for HEV

Method used

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  • Judgment method of soc usage range of vehicle power battery pack
  • Judgment method of soc usage range of vehicle power battery pack
  • Judgment method of soc usage range of vehicle power battery pack

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0018] Take any 4 sets of Ni-MH D6000× from the battery packs that have been used on XX hybrid vehicles and controlled at an average speed of 20-30km / h on a slope road in a certain automobile test site after a road test of 26,000 kilometers. 6 vehicle power battery packs, at an ambient temperature of 23 ~ 27 ℃, after 5 minutes of shelving, use a charging current of 13A to charge to a cut-off voltage of 8.771V (the same The charging current is fully charged, and the charging voltage corresponding to the 85% SOC state found on the charging curve), after being put aside for 5 minutes, it is discharged to the cut-off voltage of 6.0V with a 2A discharge current, and the total discharge time of the four battery packs is 149min, 146.4 min, 146.4min, 146.4min, the discharge curve is as follows figure 1 As shown, the discharge time corresponding to the inflection point A is 102.8min at the point where the discharge voltage drop rate of the 4 groups of batteries in the discharge curve b...

Embodiment 2

[0020] Take any 4 sets of Ni-MH D6000× from the battery packs that have been used on XX hybrid vehicles and controlled at an average speed of 60-80km / h under comprehensive road conditions in a certain automobile test site, after a road test of 86,000 kilometers 6 vehicle power battery packs, at an ambient temperature of 23 ~ 27 ℃, after 5 minutes of shelving, use a charging current of 13A to charge to a cut-off voltage of 8.771V (the same The charging current is fully charged, and the charging voltage corresponding to the 85% SOC state found on the charging curve), after being put aside for 5 minutes, it is discharged to a cut-off voltage of 6.0V with a 2A discharge current, and the total discharge time of the four battery packs is 168.10min, 166.20min, 169.52min, 168.63min, the discharge curve is as follows figure 2 As shown, the discharge time corresponding to the inflection point A is 12.8min at the point where the discharge voltage drop rate of the 4 groups of batteries i...

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Abstract

The invention provides a judgment method for an SOC use interval of an automotive power battery pack. The method includes the steps of taking the automotive power battery pack which has been used on an automobile and has passed a certain-distance road test, conducting charging with a certain charging current till the voltage is the terminal voltage in the certain SOC state after the automotive power battery pack is put aside for a certain period of time at a certain environment temperature, conducting discharging with a certain discharging current till the voltage is the cut-off voltage corresponding to the corresponding discharging current after the automotive power battery pack is put aside for a certain period of time, and obtaining the total discharging time; finding an inflection point A and an inflection point B according to an obtained discharging curve, wherein the point where the discharging voltage drop speed in the discharging curve begins to be abnormal is the inflection point A, and the point where the discharging voltage drop speed in the discharging curve returns to normal is the inflection point B; calculating the SOC values corresponding to the inflection point A and the inflection point B according to a corresponding formula, wherein the range of the SOC values corresponding to the portion, between the inflection point A and the inflection point B, of the discharging curve is the SOC use interval of the automotive power battery pack. The method is easy to operate, and the SOC use interval of the automotive power battery pack can be rapidly found.

Description

technical field [0001] The invention relates to a method for judging the SOC use range of a battery pack, in particular to a method for judging the SOC use range of a vehicle power battery pack. Background technique [0002] The 21st century is an era when human society is facing challenges of energy shortage and environmental pollution control: oil resources are decreasing year by year, oil prices are gradually rising, reducing automobile pollution and saving energy have become serious problems faced by governments all over the world. Due to battery technology and cost issues, the development of hybrid electric vehicles is the trend of the situation. In a hybrid vehicle, due to the use of a high-power energy storage device to provide instantaneous energy to the vehicle, the size of the engine can be reduced, efficiency can be improved, emissions and fuel consumption can be reduced, and energy can be recovered during braking and deceleration. Ni-MH power batteries have exce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
Inventor 徐国昌匡德志代剑张旭辉彭真
Owner 湖南科霸汽车动力电池有限责任公司