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Method for estimating and correcting lithium manganate series battery pack SOC value

A technology for correcting lithium manganate and series batteries, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., and can solve problems such as high processing speed requirements, inability to achieve online estimation by open-circuit voltage method, and cumulative error of ampere-hour integration method.

Active Publication Date: 2015-11-18
CHINA AUTOMOTIVE TECH & RES CENT
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Problems solved by technology

However, SOC cannot be directly measured as an internal parameter of the battery.
The estimation algorithms for SOC mainly include ampere-hour integration method, open-circuit voltage method, neural network method, and Kalman filter method. The network method is difficult to popularize due to the limitation of training data, and the Kalman filter algorithm requires high processing speed of the system

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  • Method for estimating and correcting lithium manganate series battery pack SOC value
  • Method for estimating and correcting lithium manganate series battery pack SOC value
  • Method for estimating and correcting lithium manganate series battery pack SOC value

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Embodiment Construction

[0119] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0120] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0121] Such as figure 1 As shown, the present invention provides a method for estimating and correcting the SOC value of lithium manganate series battery pack, comprising the following steps:

[0122] Step (1): Define the basic concept of lithium manganese oxide series battery pack in the process of charging and discharging;

[0123] Step (2): Define the basic calculation formula between the basic concepts in step (1);

[0124] Step (3): Define four suitable timings for estimating and correcting the SOC value, namely: the first suitable timing, the second suitable timing, the third suitable timing and the fourth suitable timing;

[0125] Step (4): respectively define four kinds of app...

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Abstract

The present invention provides a method for estimating and correcting lithium manganate series battery pack SOC value. The SOC calculation method of a single cell and a battery pack is redefined, four different suitable opportunities are selected, different algorithms are used, a single battery remaining capacity affected by an ampere-hour integral accumulation error and a single battery maximum available capacity affected by temperature change and aging are corrected respectively, thus the maximum available capacity and the remaining capacity of a battery pack are corrected, and the correction of an SOC single value at a particular time point is realized. In addition, for a battery pack SOC real-time calculation formula, the invention provides a more accurate initial value and a battery pack maximum available capacity value, and thus the battery pack SOC calculated in an online way is more accurate.

Description

technical field [0001] The invention belongs to the field of calculation methods for estimating and correcting the SOC value of the state of charge of an electric vehicle power battery, and in particular relates to a method for estimating and correcting the SOC value of a lithium manganese oxide series battery pack. Background technique [0002] For electric vehicles, the state of charge (SOC) of the power battery represents the remaining capacity of the battery, which acts like the fuel gauge of a traditional car fuel tank. However, SOC cannot be directly measured as an internal parameter of the battery. The estimation algorithms for SOC mainly include ampere-hour integration method, open-circuit voltage method, neural network method, and Kalman filter method. The network method is difficult to popularize due to the limitation of training data, and the Kalman filter algorithm requires high processing speed of the system. Contents of the invention [0003] In view of thi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 刘蔚刘全周李占旗晏江华戎辉龚进峰赵东欣陈慧鹏
Owner CHINA AUTOMOTIVE TECH & RES CENT
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