Battery pack capacity estimation method considering parallel battery difference

A battery pack and capacity technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of different battery charging and discharging depths, affecting the accuracy of single-cell battery capacity estimation, and inconsistent battery currents

Inactive Publication Date: 2017-10-13
JIANGSU UNIV
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Problems solved by technology

However, the difference in the internal resistance of each single battery in a single battery will lead to the inconsistency of the current flowing through each singl

Method used

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  • Battery pack capacity estimation method considering parallel battery difference
  • Battery pack capacity estimation method considering parallel battery difference
  • Battery pack capacity estimation method considering parallel battery difference

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Embodiment Construction

[0018] Attached below Figure 1-4 The present invention is further described, but the protection scope of the present invention is not limited thereto.

[0019] Based on Kirchhoff's voltage law, the battery charging voltage V can be expressed as:

[0020]

[0021] In the formula, Indicates the resistance R 0 on the voltage, Indicates the resistance R i The voltage on, i=1...n.

[0022] There is a certain functional relationship between the open circuit voltage of the battery and the SOC, and this relationship does not change with the aging of the battery. It can be seen from formula (1), assuming that the internal resistance and charging current of the single battery remain unchanged, the charging voltage V of the battery is only related to the open circuit voltage E of the battery m If they are related, the V-SOC curves of the single battery are completely coincident. If the remaining capacity of the single battery is the same as the total capacity, the charging v...

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Abstract

The invention discloses a battery pack capacity estimation method considering parallel battery difference. The method comprises steps that S1, based on the Kirchhoff's voltage law, a battery charging voltage expression is established; S2, a mathematics change method is utilized to make an aged charging voltage-capacity curve and a standard curve superpose; the aged charging voltage-capacity curve is made to realize vertical translation for deltaU to make the aged charging voltage-capacity curve and the standard curve superpose at a charging platform period, the battery aging curve after vertical translation is transversely stretched for k times and is then made to realize vertical translation to make the two curves superpose, and capacity of the single battery after aging can be expressed as C2=C1/k; S3, according to the bucket effect principle, battery pack capacity is expressed as Cpack=min(Ci)=min(Cri)+Cc; and S4, on the hypothesis that parameters of single batteries of normal single batteries are respectively consistent, the battery pack capacity is estimated through utilizing capacity of the normal single battery, Cpack=C0*SOClimit_V. The method is advantaged in that influence of parallel single battery difference on single battery capacity is considered, and safety of each single battery is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a method for estimating the capacity of a power battery of an electric vehicle. Background technique [0002] In order to prevent overcharging and overdischarging of electric vehicle power battery packs, prolong the cycle life of battery packs, and improve the overall performance and safety of electric vehicles, it is generally required that the battery management system can accurately estimate the capacity of the battery pack in real time. At present, for single batteries, researchers have proposed a series of battery capacity estimation methods based on model and data fusion, including: least squares method, Kalman filter algorithm, multivariate adaptive regression spline, support vector machine and particle filter algorithm, etc. , these methods show good adaptability and high accuracy when estimating the capacity of a single battery. [0003] When the b...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/367G01R31/388G01R31/392
Inventor 王丽梅赵秀亮刘良盘朝奉李国春陈龙江浩斌
Owner JIANGSU UNIV
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