Battery state of charge SOC correction method and device and electric automobile

A battery state-of-charge and state-of-charge technology, applied in the electronic field, can solve problems such as large SOC cumulative error

Active Publication Date: 2017-07-07
奇瑞新能源汽车股份有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0007] In order to solve the problem that the BMS calculates the SOC through the ampere-hour integration method, the cumulative er...

Method used

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  • Battery state of charge SOC correction method and device and electric automobile
  • Battery state of charge SOC correction method and device and electric automobile
  • Battery state of charge SOC correction method and device and electric automobile

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Embodiment Construction

[0084] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.

[0085] First, several nouns involved in this article are introduced.

[0086] 1. The start-up phase of the battery pack system: refers to the phase in which the open circuit voltage (OCV) of the battery pack system rises and the rate of change is relatively large.

[0087] 2. The operating phase of the battery pack system: refers to the phase in which the OCV of the battery pack system is conti...

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Abstract

The invention discloses a battery state of charge SOC correction method and device and an electric automobile, and belongs to the technical field of electronics. The method comprises the steps that the initial state of charge SOC and the first temperature value of a battery pack system at the ith moment are acquired, wherein i>0; the actual SOC of the battery pack system is determined according to the first temperature value; the theoretical SOC of the ith moment is calculated according to the initial SOC and the first temperature value through an ampere-hour integral method; and the theoretical SOC is corrected according to the difference value between the theoretical SOC and the actual SOC so that the corrected SOC corresponding to the ith moment is obtained. The problem of inaccuracy of the calculated SOC caused by the fact that the calculated theoretical SOC is directly used as the real SOC of the battery pack system when the SOC is calculated by a BMS according to the ampere-hour integral method can be solved so that the accuracy of the SOC obtained by the BMS can be enhanced.

Description

technical field [0001] Embodiments of the present invention relate to the field of electronic technology, and in particular to a method and device for correcting battery state of charge SOC and an electric vehicle. Background technique [0002] With the development of electric vehicle technology, the use of electric vehicles is becoming more and more widespread. Electric vehicles can estimate the mileage of the vehicle based on the state of charge (SOC) of the battery pack system, thereby providing drivers with important information on the driving mileage. Among them, the battery pack system is the main source of power for electric vehicles; SOC refers to the ratio of the remaining battery capacity of the battery in the battery pack system to the total battery capacity when it is fully charged after being used for a period of time or left for a period of time. [0003] Electric vehicles usually use a battery management system (BMS) to determine the SOC of the battery pack s...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 杨玉梅姚朝华余洁韩友国
Owner 奇瑞新能源汽车股份有限公司
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