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Lithium ion battery equivalent circuit parameter online identification method and system

A lithium-ion battery, equivalent circuit technology, applied in the measurement of resistance / reactance / impedance, measurement of electricity, capacitance measurement and other directions, can solve the problem of poor parameter identification accuracy

Active Publication Date: 2021-09-14
SHANDONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] This application provides an online identification method and system for equivalent circuit parameters of lithium-ion batteries to solve the problem that the online identification method for equivalent circuit parameters of lithium-ion batteries in the prior art makes parameter identification accuracy poor

Method used

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  • Lithium ion battery equivalent circuit parameter online identification method and system
  • Lithium ion battery equivalent circuit parameter online identification method and system
  • Lithium ion battery equivalent circuit parameter online identification method and system

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Embodiment 1

[0082] see figure 1 , figure 1 It is a schematic flowchart of an online identification method for equivalent circuit parameters of a lithium-ion battery provided in an embodiment of the present application. Depend on figure 1 It can be seen that an online identification method for equivalent circuit parameters of a lithium-ion battery provided in the embodiment of the present application mainly includes the following process:

[0083] S1: Initialize the online identification algorithm of equivalent circuit parameters.

[0084] The equivalent circuit is a commonly used battery dynamic model in the battery management system. It usually includes: the equivalent circuit of the internal resistance model, the equivalent circuit of the PGNV (Partership for a New Generation of Vehicles) model, and the equivalent circuit of the N-order RC model. This implementation The identification method in the example is applied to an equivalent circuit containing multiple RC links, that is, an ...

Embodiment 2

[0159] exist Figure 1-Figure 7 On the basis of the illustrated embodiment see Figure 8 , Figure 8 It is a schematic structural diagram of an online identification system for equivalent circuit parameters of a lithium-ion battery provided in an embodiment of the present application. Depend on Figure 8 It can be seen that the online identification system for equivalent circuit parameters of lithium-ion batteries in this embodiment mainly includes: an initialization module, an ohmic internal resistance identification module, an RC parameter identification module and a cycle control module.

[0160] Among them, the initialization module is used to control the initialization of the online identification algorithm of the equivalent circuit parameters; the ohmic internal resistance identification module is used to update the ohmic internal resistance RLS estimator according to the new real-time measurement data and the current equivalent circuit parameter identification results...

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Abstract

The invention discloses a lithium ion battery equivalent circuit parameter online identification method and system, and the method comprises the steps: initializing an equivalent circuit parameter online identification algorithm, updating an equivalent circuit ohm internal resistance identification result through an ohm internal resistance RLS estimator according to newly-added real-time measurement data and a current equivalent circuit parameter identification result, according to newly added real-time measurement data and an updated equivalent circuit parameter identification result, sequentially performing operations of polarization voltage calculation, data low-pass filtering processing, data resampling after filtering, and starting an RLS estimator of the RC link after re-sampling and extraction on each RC link, so as to realize the identification of RC parameters in each RC link, and returning to carry out ohmic internal resistance identification of the next cycle until the equivalent circuit parameter online identification algorithm is terminated. The system comprises an initialization module, an ohm internal resistance identification module, an RC parameter identification module and a circulation control module. According to the invention, the parameter identification precision and accuracy of the equivalent circuit can be improved.

Description

technical field [0001] The present application relates to the technical field of battery energy storage system control, in particular to a method and system for online identification of equivalent circuit parameters of lithium-ion batteries. Background technique [0002] In the field of battery energy storage system control, with the development of green transportation and low-carbon energy, lithium-ion batteries have become the mainstream choice for battery energy storage for electric vehicles and power grids due to their excellent performance and ease of commercialization. However, lithium-ion batteries have the characteristics of relatively high price, limited overcharge and over-discharge resistance, and potential thermal runaway. Therefore, it is necessary to monitor the status of lithium-ion batteries to ensure their safe and reliable operation. [0003] An accurate dynamic model is the basis for efficient battery management and monitoring, and the equivalent circuit i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/378G01R31/389G01R27/08G01R27/26
CPCG01R31/367G01R31/378G01R31/389G01R27/08G01R27/2605Y02E60/10
Inventor 施啸寒李杰张恒旭王晓磊石淼岩李泽宇周博曦吴晓庆贺存哲路致远
Owner SHANDONG UNIV
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