Mixed rapid estimation method for residual energy of battery

A technology for battery remaining power and remaining power, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., and can solve problems such as poor accuracy and inability to meet online detection

Inactive Publication Date: 2010-01-13
HANGZHOU DIANZI UNIV
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Problems solved by technology

When the battery SOC is estimated by the open circuit voltage method, the battery must be left for a long time to reach a stable state, and it is only suitable for the SOC estimation of the electric vehicle in the parking state, which cannot meet the online detection requirements
The ampere-hour method is easily affected by the accuracy of current measurement, and the accuracy is very poor in the case of high temperature or severe current fluctuations

Method used

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  • Mixed rapid estimation method for residual energy of battery
  • Mixed rapid estimation method for residual energy of battery
  • Mixed rapid estimation method for residual energy of battery

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Embodiment Construction

[0053] The specific steps of the hybrid fast estimation method for remaining battery power are:

[0054] Step (1). Express the state of charge of the battery at each moment with the state equation and the observation equation:

[0055] Equation of state: z k + 1 = f ( z k , i k ) + w k = z k - ( η i Δt Q n ) i k + w k

[0056] Observation equation: y k ...

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Abstract

The invention relates to a mixed rapid estimation method for the residual energy of a battery. The prior method can not satisfy online detection requirements and has poor precision. The method comprises the following steps: firstly, estimating the initial residual energy of the battery by an open-circuit pressure method; then, alternately using an extended Kalman filtering method and an ampere hour method to estimate the residual energy of the battery; and directly using the extended Kalman filtering method to estimate the residual energy when the residual energy is very low. The method can conveniently and rapidly estimate the residual energy of the battery and has high velocity of convergence and higher estimation precision.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a hybrid fast estimation method for battery remaining power. Background technique [0002] As a backup power source, batteries have been widely used in communications, power systems, military equipment and other fields. Compared with traditional fuel vehicles, electric vehicles can achieve zero emissions, so they are the main development direction of future vehicles. In an electric vehicle, the battery is directly used as an active energy supply component, so its working condition is directly related to the driving safety and operational reliability of the entire vehicle. In order to ensure the good performance of the battery pack in electric vehicles and prolong the service life of the battery pack, it is necessary to know the operating status of the battery in a timely and accurate manner, and manage and control the battery reasonably and effectively. [0003] Accurate estima...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 何志伟高明煜徐杰黄继业曾毓
Owner HANGZHOU DIANZI UNIV
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