Method and system for on-line calculation of electrical core capacity and state of health (SOH), and electric vehicle

A cell and capacity technology, applied in electric vehicles, vehicle energy storage, vehicle components, etc., can solve the problems of large estimation error and cumbersome algorithm, and achieve the effect of small error, high data accuracy, and online calculation.

Active Publication Date: 2017-04-19
江苏和中普方新能源科技有限公司
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Problems solved by technology

The algorithm is more cumbersome

Method used

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  • Method and system for on-line calculation of electrical core capacity and state of health (SOH), and electric vehicle
  • Method and system for on-line calculation of electrical core capacity and state of health (SOH), and electric vehicle
  • Method and system for on-line calculation of electrical core capacity and state of health (SOH), and electric vehicle

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[0036] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples cited are only used to explain the present invention, and are not used to limit the scope of the present invention.

[0037] Such as figure 1 A schematic flowchart of a method for online calculation of cell capacity and SOH provided by an embodiment of the present invention is given. Such as figure 1 As shown, a method for online calculation of cell capacity and SOH includes the following steps:

[0038] 110. Establish a reference curve based on the charge / discharge of the new battery cell;

[0039] 120. Establish a correspondence relationship between the amount of translation between the charge / discharge curve and the reference curve of the battery of different capacities and the capacity of the battery, wherein the battery of different capacities has the same type of cathode material as the new battery described in S1;

[0040] 130. Obtain the...

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Abstract

The invention relates to a method and system for on-line calculation of an electrical core capacity and a state of health (SOH), and an electric vehicle. The method comprises: a datum curve is established according to a charging/discharging situation of a new electric core; a correspondence relationship of translation values between charging/discharging curves of electric cores with different capacities and datum curves and electric core capacities is established, wherein the positive material types of the electric cores with different capacities and the new electric cores are identical; a translation value between a charging/discharging curve of an electric core with the capacity needing to be measured and the datum curve is obtained, and the electric core capacity corresponding to the translation value is calculated according to the correspondence relationship of the translation value and the electric core capacity. According to the method, translation of a practically measured charging or discharging curve is realized and a relationship between the translation value and the capacity is established; and on the basis of the correspondence relationship between the capacity and the translation value, the electric core capacity and the SOH are calculated. The method has advantages of data accuracy, simple operation, online computing realization, simpleness in realization, and small error.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a method, system and electric vehicle for online calculation of cell capacity and SOH. Background technique [0002] As a key component of electric vehicles, the power battery system's performance and application level have affected the development and popularization of electric vehicles. How to maintain good electrochemical performance for a long time on the basis of the existing technical level and ensure the safety and reliability in actual use are the issues that major power battery system manufacturers are more concerned about. At present, the development of remote monitoring system, as a new data acquisition method of battery management system, is receiving extensive attention from major battery manufacturers and vehicle manufacturers. The remote monitoring system can monitor the working status of the power battery system in real time and collect battery status p...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/367Y02T10/70
Inventor 高超于静美李春小李伟尹景云顾辉
Owner 江苏和中普方新能源科技有限公司
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