Method and system for estimating SOC of hybrid power vehicle-mounted battery

A vehicle-mounted battery and hybrid power technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as the difficulty of SOC estimation, achieve the effects of simple and fast calibration, improve service life, and improve accuracy

Active Publication Date: 2020-10-16
HIGER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for batteries, especially lithium iron phosphate batteries, the scope of use here is mainly distributed in the voltage plateau area, which makes it difficult to estimate the SOC

Method used

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  • Method and system for estimating SOC of hybrid power vehicle-mounted battery
  • Method and system for estimating SOC of hybrid power vehicle-mounted battery
  • Method and system for estimating SOC of hybrid power vehicle-mounted battery

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Experimental program
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Embodiment 1

[0040] An algorithm for estimating the SOC of a hybrid power battery disclosed in this embodiment includes the following steps:

[0041] Step 1. The SOC vehicle use range is a range, and this range is set as the common use range of the whole vehicle, which is recorded as [40, 70];

[0042] Step 2. For the battery OCV-SOC curve, if figure 2 As shown, the platform area is relatively flat, and it is generally difficult to calibrate through the platform. Therefore, select the area with a large slope at both ends of the curve, the high-end area [95, 100], and the low-end area [0, 30]. The calibration area setting should be Included in the range of high-end area and low-end area;

[0043] Step 3. The use range of hybrid vehicles is generally distributed in the platform area, especially the lithium iron phosphate battery is more obvious. Therefore, within the range of the SOC range of the whole vehicle [40, 70], use the ampere-hour integral C=∫Idt to calculate the battery SOC ;

...

Embodiment 2

[0047] An algorithm for estimating the SOC of a hybrid battery disclosed in this embodiment includes the following steps:

[0048] Step 1. The SOC vehicle use range is a range, and this range is set as the common use range of the whole vehicle, which is recorded as [40, 70];

[0049] Step 2. For the battery OCV-SOC curve, the platform area is relatively flat, and it is generally difficult to calibrate through the platform. Therefore, select the area with a large slope at both ends of the curve, the high-end area [95, 100], and the low-end area [0, 30], the calibration area setting should be included in the range of high-end area and low-end area;

[0050] Step 3. The usage range of hybrid vehicles is generally distributed in the platform area, especially the lithium iron phosphate battery is more obvious. Therefore, within the SOC range [40, 70] of the whole vehicle, use the ampere-hour integral C=∫Idt to calculate the battery SOC ;

[0051] Step 4. Through calibration, when...

Embodiment 3

[0054] An algorithm for estimating the SOC of a hybrid battery disclosed in this embodiment includes the following steps:

[0055] Step 1. The SOC vehicle use range is a range, and this range is set as the common use range of the whole vehicle, which is recorded as [40, 70];

[0056] Step 2. For the battery OCV-SOC curve, the platform area is relatively flat, and it is generally difficult to calibrate through the platform. Therefore, select the area with a large slope at both ends of the curve, the high-end area [95, 100], and the low-end area [0, 30], the calibration area setting should be included in the range of high-end area and low-end area;

[0057] Step 3. The usage range of hybrid vehicles is generally distributed in the platform area, especially the lithium iron phosphate battery is more obvious. Therefore, within the SOC range [40, 70] of the whole vehicle, use the ampere-hour integral C=∫Idt to calculate the battery SOC ;

[0058] Step 4. Through calibration, when t...

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Abstract

The invention discloses a method for estimating the SOC of a hybrid power vehicle-mounted battery. The method comprises the following steps of: determining an SOC use interval of a whole vehicle use range; calculating the SOC of the battery by using an ampere-hour integral method in the SOC use interval; calibrating a battery OCV-SOC curve, and selecting a calibration interval according to the slope of the battery OCV-SOC curve; when the charging and discharging throughput of the battery reaches a set threshold value, controlling the SOC use interval of the whole vehicle use range to be open,selecting a calibration point in the calibration interval, and determining the calibration range of the SOC; and calibrating the SOC through the SOC-OCV curve, and after the SOC is calibrated, changing the SOC open interval into an SOC use interval. And the estimation precision of the SOC of the power battery can be improved in a mode of combining ampere-hour integration and voltage high-low end calibration.

Description

technical field [0001] The invention belongs to the field of electric vehicle power battery management, and in particular relates to a method and system for estimating the SOC of a hybrid vehicle battery. Background technique [0002] An electric vehicle is a means of transportation with an electric motor as the power device and a battery as the energy storage device. The development of electric vehicles is an emerging strategic industry that countries have vigorously developed after the energy crisis and financial crisis. Therefore, battery management is extremely important. The remaining capacity of the battery pack (SOC) is an important parameter of the battery management system, the most important reference for battery usage route planning, and the basis for power management in battery management. [0003] SOC estimation is one of the most important parameters during battery use. High-precision SOC estimation can not only provide a good basis for the estimation of othe...

Claims

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Application Information

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IPC IPC(8): G01R31/3828G01R31/374
CPCG01R31/3828G01R31/374
Inventor 樊海梅张巍李春熊金峰徐毛五朱恒张建利
Owner HIGER
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