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Pure electric vehicle power battery pack capacity calibration method based on current

A technology for power battery packs and pure electric vehicles, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of inconvenient travel, easy to mislead drivers, etc., and achieve the effect of convenient travel.

Active Publication Date: 2013-12-11
ANHUI ANKAI AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the rated capacity of the battery is still used to calculate the SOC under these circumstances, it is easy to mislead the driver and cause inconvenience to their travel
At the same time, due to the different process of battery attenuation, the actual capacity of the battery is not fixed.

Method used

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  • Pure electric vehicle power battery pack capacity calibration method based on current

Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: A method for calibrating the capacity of a power battery pack of a pure electric vehicle based on current, comprising the steps in the following order:

[0030] (1) When the power battery pack is fully charged, the battery management system BMS will clear the consumed capacity of the power battery pack, and then discharge the power battery pack from the full state;

[0031] (2) The battery management system BMS judges whether the current discharge current is a large current or a small current. If it is a large current, perform step (3); if it is a small current, perform step (4); the high current refers to the increase of the discharge current And the discharge rate is greater than 0.1C, or the discharge current decreases and the discharge rate is greater than or equal to 0.01C; the small current refers to the discharge current decreases and the discharge rate is less than 0.01C, or the discharge current increases and the discharge rate is less than or equa...

Embodiment 2

[0041] Embodiment 2: A method for calibrating the capacity of a power battery pack of a pure electric vehicle based on current, comprising the steps in the following order:

[0042] (1) When the power battery pack is fully charged, the battery management system BMS will clear the consumed capacity of the power battery pack, and then discharge the power battery pack from the full state;

[0043] (2) The battery management system BMS judges whether the current discharge current is a large current or a small current. If it is a large current, perform step (3); if it is a small current, perform step (4); the high current refers to the increase of the discharge current And the discharge rate is greater than 0.1C, or the discharge current decreases and the discharge rate is greater than or equal to 0.01C; the small current refers to the discharge current decreases and the discharge rate is less than 0.01C, or the discharge current increases and the discharge rate is less than or equal ...

Embodiment 3

[0052] Embodiment 3: A method for calibrating the capacity of a power battery pack of a pure electric vehicle based on current, comprising the steps in the following sequence:

[0053] (1) When the power battery pack is fully charged, the battery management system BMS will clear the consumed capacity of the power battery pack, and then discharge the power battery pack from the full state;

[0054] (2) The battery management system BMS judges whether the current discharge current is a large current or a small current. If it is a large current, perform step (3); if it is a small current, perform step (4); the high current refers to the increase of the discharge current And the discharge rate is greater than 0.1C, or the discharge current decreases and the discharge rate is greater than or equal to 0.01C; the small current refers to the discharge current decreases and the discharge rate is less than 0.01C, or the discharge current increases and the discharge rate is less than or e...

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Abstract

The invention provides a pure electric vehicle power battery pack capacity calibration method based on the current. The pure electric vehicle power battery pack capacity calibration method comprises the steps of in the traveling process of a vehicle, enabling a battery management system to analyze whether large-current discharging is carried out or small-current discharging is carried out at present according to increase and decrease of the discharging current of a power battery pack, carrying out real-time judgment on the average voltage and the average lowest voltage of battery units under the two conditions, when the average voltage and the average lowest voltage under the two conditions respectively meet corresponding conditions, calibrating an SOC value, and then calculating the practical total capacity of the current power battery pack with cooperation of the recorded consumed capacity of the power battery pack. According to the pure electric vehicle power battery pack capacity calibration method, every time when the power battery pack begins to carry out discharging from a fully-charged state, one-time capacity calibration will be carried out on the power battery pack, the SOCs of the power battery pack are guaranteed to be calculated based on the current practical total capacity, the situation that a driver makes correct judgment on whether charging is required or not is facilitated, and convenience is brought to traveling of the driver.

Description

technical field [0001] The invention relates to the technical field of electric vehicle battery capacity calibration, in particular to a current-based method for calibrating the capacity of a pure electric vehicle power battery pack. [0002] Background technique [0003] With the popularity of electric vehicles, during their use, drivers are used to judging whether they need to be charged by the SOC value. Every electric vehicle is equipped with a power lithium battery with a corresponding rated capacity when it leaves the factory. However, the difference in the use environment will cause the actual capacity of the battery to deviate from its rated capacity. For example, the capacity of the battery in a cold climate is smaller than that at normal temperature. As we all know, the capacity of a battery that has been used many times will also decay. If the rated capacity of the battery is still used to calculate the SOC under these conditions, it is easy to mislead the driv...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 胡洋陈顺东吴成加尹剑赵枫徐川
Owner ANHUI ANKAI AUTOMOBILE
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