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Method for evaluating state of health battery in real time

A battery state of health, battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of unclear quantitative description, difficult internal resistance measurement method, etc.

Active Publication Date: 2014-03-26
TSINGHUA UNIV
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Problems solved by technology

Furthermore, the internal resistance of the battery is also related to the electrochemical equilibrium state inside the battery. At present, the quantitative description of the formation of the internal resistance of the battery is not clear, which brings great difficulties to the internal resistance measurement method, let alone the application Online Estimation of Battery SOH

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  • Method for evaluating state of health battery in real time
  • Method for evaluating state of health battery in real time
  • Method for evaluating state of health battery in real time

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Embodiment Construction

[0027] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0028] The present invention proposes a method for evaluating the state of health of a battery in real time using a probability density function, and the method can at least be used for online state of health (SOH) estimation of a power battery.

[0029] According to an embodiment of the present invention, it specifically includes the following steps:

[0030] as attached figure 1 As shown, the following steps can be divided into two stages. The first stage is the test calibration stage, which is similar to the MAP map calibration of internal combustion engines, and is generally carried out in the laboratory; the second stage is the online estimation stage, whic...

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Abstract

The invention provides a method for evaluating state of health of a battery in real time and belongs to the technical field of batteries. By the method, realtime estimation of the state of health of the battery is realized, shared problems of a charging and discharging method, a voltage differential method / capacity increment method and an internal resistance measuring method are solved, the difficulty in online estimating the SOH (state of health) of the battery is overcome, and an advanced algorithm is provided for an electromobile battery management system. As shown in an abstract drawing, the algorithm includes two stages, the first stage is a test and calibration stage which is similar to MAP graph calibration of an internal combustion engine and is generally performed in a laboratory, and a probability density function (PDF) is used in the first stage; the second stage is an online estimation stage which is an implementation process of an online estimation algorithm of the SOH of the battery. In an embodiment of the invention, realtime estimation error of the algorithm is smaller than 2% in most circumstances.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for estimating the state of health of batteries online. Background technique [0002] The state of health of the battery (SOH, State of Health) reflects the degree of life decay of the battery. The degree of battery life attenuation affects the power performance, driving range and safety performance of electric vehicles, and requires effective evaluation. In order to effectively manage the battery pack and improve the performance of the power battery pack under vehicle conditions, the battery state of health estimation algorithm is one of the key algorithms that need to be included in the battery management system. [0003] Currently, the quantitative definition of battery state of health (SOH) is the ratio of battery remaining capacity to initial capacity. In order to estimate the state of health (SOH) of the battery, a commonly used method is the charge...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 冯旭宁卢兰光欧阳明高何向明李建军李建秋韩雪冰
Owner TSINGHUA UNIV
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