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Battery pack fault simulation method and fault detection method

A fault simulation, battery pack technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of high cost, difficulty, ineffectiveness, etc., to achieve accurate fault alarm, high reference value, and improve the effect of safety.

Active Publication Date: 2019-08-30
HUIZHOU BNET TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, battery manufacturers, battery management system manufacturers, and automobile manufacturers are all focusing on the management of battery packs, while research on the characteristics of battery packs and their cells has been ignored, resulting in the current situation of battery pack applications. There are various fault alarm methods and fault detection methods in the process, but they can only alarm or take corresponding fault measures when a fault occurs. Although the accident loss caused by the battery pack fault is reduced to a certain extent, the fault alarm cannot be effectively carried out. The occurrence of accidents caused by faults cannot be avoided from the root cause
[0004] However, it is difficult to study the safety characteristics of the battery pack itself or its cells, and to obtain the true characteristics of the battery pack or its cells under extreme conditions.
First of all, the price of the battery is expensive, and the battery is used as a test sample, and the cost is high
In addition, during the test process of the battery pack, especially under extreme test conditions, the safety characteristics are unpredictable, and there are great potential safety hazards
And in the actual operation process, it is difficult to obtain the data of the battery pack and the battery cell when the electric vehicle catches fire, so it is impossible to study the change of the electrical characteristics of the battery pack before the danger occurs.

Method used

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  • Battery pack fault simulation method and fault detection method
  • Battery pack fault simulation method and fault detection method
  • Battery pack fault simulation method and fault detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1 of the present invention provides a battery pack failure simulation method, refer to figure 1 , the battery pack failure simulation method includes the following steps:

[0053] (1-1) Establish a single cell model;

[0054] (1-2) Combine several single cell models into a battery pack model;

[0055] (1-3) Establish the battery pack state curve of the fault data of the battery pack model with respect to the fault conditions of a single battery cell in the battery pack model.

[0056] The invention combines the battery pack model according to the single cell model, and establishes the battery pack model fault data and the battery pack state curve about the fault condition of the single cell in the battery pack model, without the need to test through the physical cell, reducing the cost , and by simulating faults, the state data of the battery pack under extreme conditions can be accurately obtained, which has a high reference value for the actual applicatio...

Embodiment 2

[0058] Embodiment 2 of the present invention provides a battery pack fault simulation method, which is an improvement on the basis of Embodiment 1. refer to figure 2 , the battery pack failure simulation method includes the following steps:

[0059] (2-1) Establish a single cell model. The specific process is as follows:

[0060](2-11) Through the working condition test of the single battery cell, the relationship table between OCV, SOC and temperature of the single battery cell is obtained, as well as the state data of the single battery cell under different working conditions. During the experiment, it is preferable to select the single cells of the same batch to conduct multi-working condition tests respectively. Selecting the same batch of single cells can make the consistency between the single cells as good as possible, and the experimental results are more accurate. During the experiment, the state data of the single cell at different temperatures and different wor...

Embodiment 3

[0072] Embodiment 3 of the present invention provides a battery pack fault detection method based on the battery fault test method described in Embodiment 1 above.

[0073] In order to achieve the above object, the technical scheme provided by the invention is as follows:

[0074] The invention provides a battery pack fault detection method, comprising the following steps:

[0075] a. The battery pack model fault data obtained by the above battery pack fault simulation method is pre-stored in the battery management system with respect to the battery pack state curve of the fault condition of a single battery cell in the battery pack model.

[0076] b During the charging and discharging process of the battery pack, collect the working status data of the battery pack. In this embodiment, the working state data includes but not limited to voltage data, internal resistance data, and temperature data.

[0077] c Fit the collected working state data of the battery pack to the work...

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PUM

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Abstract

The invention discloses a battery pack fault simulation method and a fault detection method. The fault simulation method comprises steps: (1) a single cathode mix model is built; (2) a plurality of single cathode mix models are combined into a battery pack model; and (3) a battery pack state curve for battery pack model fault data in relation to the fault condition of the single cathode mix in the battery pack model is built. The fault detection method comprises steps: A, the battery pack state curve for battery pack model fault data in relation to the fault condition of the single cathode mix in the battery pack model is pre-stored in a battery management system; B, working state data of the battery pack are acquired; C, a battery pack working curve is fit; D, the battery pack working curve is compared with the pre-stored battery pack state curve; and E, if the consistency of the two is higher than a preset fault threshold, the battery pack is judged to be in a fault state. The battery pack state data under extreme conditions can be accurately acquired through a fault simulation mode, and the cost is low; and the battery pack use safety is improved through accurate fault detection on the battery pack.

Description

technical field [0001] The invention relates to the technical field of power batteries, and more specifically, to a battery pack fault simulation method and a fault detection method. Background technique [0002] With the promotion of national energy conservation and emission reduction policies, electric vehicles are gradually accepted by people, and the market share of electric vehicles is increasing year by year. However, the power source of electric vehicles is different from the fuel source of ordinary locomotives. The characteristics of the power battery used in electric vehicles are elusive, and the electrical and physical characteristics change greatly with the change of the environment. reason. [0003] As the power source of electric vehicles, the safety performance of battery packs during use is particularly important. However, at present, battery manufacturers, battery management system manufacturers, and automobile manufacturers are all focusing on the manageme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/367
Inventor 徐文赋任素云陈爱雨
Owner HUIZHOU BNET TECH CO LTD