Lithium-ion battery pack external short circuit fault diagnostic method based on two-stage model prediction

A lithium-ion battery pack and external short-circuit technology, which is applied in the direction of measuring electricity, measuring electrical variables, and measuring devices, can solve problems such as immature fault diagnosis methods and lack of external short-circuit fault diagnosis technology for high-power battery packs, and achieve easy Online implementation, high reliability, and simple steps

Active Publication Date: 2019-05-10
NORTHEASTERN UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] At present, most of the existing battery management systems are aimed at battery state estimation and life prediction, but the methods for battery safety and fault diagnosis are still immature, especially for external short-circuit fault diagnosis technology for high-power battery packs.

Method used

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  • Lithium-ion battery pack external short circuit fault diagnostic method based on two-stage model prediction
  • Lithium-ion battery pack external short circuit fault diagnostic method based on two-stage model prediction
  • Lithium-ion battery pack external short circuit fault diagnostic method based on two-stage model prediction

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Embodiment Construction

[0036] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] In the embodiment, the 18650NMC cylindrical lithium-ion power battery is taken as an example, the rated voltage is 3.6V, the nominal capacity is 2.4Ah, and 6 battery cells with SOH value>0.96 are used to form a battery pack; the experimental equipment is: NEU_ESCTEST02 test bench Cooperate with Haixiang Instruments GD-2045D temperature control box,

[0038] The method of this example is as follows.

[0039] The invention provides a method for diagnosing external short-circuit faults of lithium-ion battery packs based on two-stage model prediction, such as figure 2 shown, including the following steps:

[0040] Step 1: Carry out the external short-circuit experimen...

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Abstract

The invention provides a lithium-ion battery pack external short circuit fault diagnostic method based on two-stage model prediction, and relates to the technical field of lithium-ion power battery safety. Firstly, an external short circuit experiment is conducted on a lithium-ion battery pack, a battery pack external short circuit two-stage equivalent circuit model is constructed, tested experiment data are used, and thus optimality identification is conducted on battery model parameters; then the battery state in the battery pack is judged in operation according to battery measuring data, when abnormality of part battery voltage occurs, adjacent battery units of the battery unit with abnormality are marked as a whole and are written as an abnormal battery pack, a first stage battery model is started, if the error of the first stage battery model is less than a critical threshold value, then a second stage battery model is started, and model errors are calculated to obtain; and finally, fault diagnosis is conducted on the abnormal battery through goodness fit of the measured data and the two-stage model. The lithium-ion battery pack external short circuit fault diagnostic method is simple in step, easy to achieve on line, high in reliability and is suitable for on-line fault diagnosis and safe management of the electric vehicle power battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion power battery safety, in particular to a method for diagnosing external short-circuit faults of lithium-ion battery packs based on two-stage model prediction. Background technique [0002] In recent years, electric vehicles have developed rapidly. The development of electric vehicles is regarded as an effective way to solve environmental pollution, reduce fuel consumption, and build green and environmentally friendly urban transportation. However, safety accidents of fire and explosion often occur during the application of battery vehicles. , the root cause is often thermal runaway due to battery failure. External short-circuit is one of the most common and serious faults in battery faults. When an external short-circuit fault occurs, the battery pack generates a large current, which is likely to cause high temperature and high heat in the battery. The duration of an external short-circuit fau...

Claims

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Application Information

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IPC IPC(8): G01R31/367G01R31/396
CPCG01R31/367G01R31/396
Inventor 陈泽宇蔡雪杨英张浩张清
Owner NORTHEASTERN UNIV
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