Method for estimating open-circuit voltage of battery based on gas-liquid dynamic model and device

A technology of dynamic model and open circuit voltage, which is applied in measuring devices, complex mathematical operations, measuring electricity, etc., can solve problems such as difficult real-time estimation of on-board MCU, battery model can not meet the requirements of practical application, etc., to achieve easy understanding and reduce parameters The effect of identifying difficulty and eliminating errors

CN110045286AActive Publication Date: 2019-07-23承德神奥新能源科技有限公司
11 Cites 12 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-07-23

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a method for estimating the open-circuit voltage of a battery based on a gas-liquid dynamic model and a device. The method for estimating the open-circuit voltage of the batterybased on the gas-liquid dynamic model comprises the following steps that 1, an undetermined open-circuit voltage estimation equation is deduced according to the gas-liquid dynamic model; 2, equationparameters are identified and estimated according to experimental data; and 3, an open-circuit voltage estimation method is designed according to the complete open-circuit voltage estimation equation,and calculating is carried out to obtain an open-circuit voltage estimation value. The open-circuit voltage estimation equation comprises the battery temperature, does not need to be coupled with thebattery temperature again, and simplifies the open-circuit voltage estimation process. The principle of gas dissolution / precipitation in the estimation equation is equivalent to the polarization effect of the battery, the phenomenon that the open-circuit voltage lags the terminal voltage of the battery cab be better fitted. An estimation result of the estimation equation does not depend on the precision of an input initial value, and excellent estimation robustness is achieved. According to the method and device for estimating the open-circuit voltage of the battery based on the gas-liquid dynamic model, the non-linear process of battery charging and discharging can be more accurately depicted, a simple analytical formula, easy parameter identification and small calculation amount are achieved, the influence of battery temperature characteristics on the open-circuit voltage is reflected, and the method and device for estimating the open-circuit voltage of the battery based on the gas-liquid dynamic model is convenient to realize in engineering.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of battery management systems, and in particular relates to a battery open-circuit voltage estimation method and device based on an aero-hydraulic dynamics model. Background technique

[0002] Oil is known as black gold and the blood of industry, but oil resources will gradually become exhausted as humans continue to exploit them. Transportation accounts for nearly half of the total consumption of petroleum, and countries all over the world are trying to find energy sources that can replace petroleum. Among them, vigorously developing electric vehicle technology is one of the important choices. However, during the use of the vehicle-mounted lithium battery, due to the increase of the discharge depth, the decrease of the internal active material, the increase of the EIS film thickness, the increase of the internal resistance, the reversible capacity attenuation and the change of the ambient temperature, some important ...

Examples

Embodiment approach

[0066] figure 1 Shown is an implementation of the method for estimating the open circuit voltage of a battery based on the gas-hydrodynamic model of the present invention. The method for estimating the open circuit voltage of a battery based on the gas-hydrodynamic model includes the following steps:

[0067] Step 1, deduce the undetermined open circuit voltage estimation equation according to the gas-hydraulic dynamics model;

[0068] Such as figure 2 As shown, the physical prototype of the gas-liquid dynamics model is a closed container with a gas-liquid coexistence system, and the container is equipped with a compressed gas with a volume of V, a pressure of P, an amount of substance of n, and an average temperature of T and Volume is V w liquid, n j Indicates the amount of substance dissolved in the gas in the liquid; there is an elbow and an openable valve on the top of the container. If the valve is opened, the gas in the container can be released or the outside gas c...