公开(公告)号：US20220381849A1

公开(公告)日：2022-12-01

申请号：US17765204

申请日：2020-10-23

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG ,  Yunlong SHANG ,  Qi ZHANG ,  Bin DUAN

IPC: G01R31/396 ,  G01R31/3835

Abstract: A multi-fault diagnosis method has the following steps: measuring cell voltages of a battery pack to be diagnosed; constructing a cell voltage sequence according to measured cell voltages of the battery pack to be diagnosed, and calculating a sample entropy value of the cell voltage sequence; setting a correction coefficient for representing voltage fluctuation information, and correcting the sample entropy value through the correction coefficient to obtain a corrected sample entropy value; and judging and outputting a fault type of the battery pack to be diagnosed according to a numerical value change of the corrected sample entropy value. Faults of cells can be accurately diagnosed without a model, sample entropy values under different faults can be distinguished by setting the correction coefficient, the intuitiveness and efficiency of fault detection are improved, and the fault type and time of the lithium-ion cells can be quickly, accurately and stably diagnosed and predicted.

公开(公告)号：US20230184627A1

公开(公告)日：2023-06-15

申请号：US18010462

申请日：2021-06-15

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG ,  Qi ZHANG ,  Ke LI ,  Naxin CUI ,  Yunlong SHANG ,  Bin DUAN

IPC: G01M17/007 ,  G07C5/00 ,  H04L67/10 ,  H04L67/12

CPC classification number: G01M17/007 ,  G07C5/008 ,  H04L67/10 ,  H04L67/12

Abstract: Provided is a system and method for the distributed networked test of electric vehicles based on a cloud platform, comprising a cloud computing platform and a plurality of remote test benches, wherein the remote test benches, being provided at least two, to form a remote distributed networked structure and transmit test data to the cloud computing platform; the cloud computing platform, being in real-time bidirectional data communication with the remote test bench and configured to receive each test data in real-time, perform a data cleaning, a data classing washing, a data fusion and a data mining, extract useful data information from the test data, build corresponding a data model and a mechanism model on the cloud computing platform according to historical data and a mechanism of control object, control for different test benches, and complete a fault diagnosis and an early warning.

公开(公告)号：US20200209316A1

公开(公告)日：2020-07-02

申请号：US16644329

申请日：2017-11-01

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG ,  Zhongkai ZHOU ,  Bin DUAN ,  Yunlong SHANG ,  Yan LI ,  Naxin CUI

IPC: G01R31/367 ,  G01R31/36

Abstract: A new method for iteratively identifying parameters of an equivalent circuit model of battery, including the steps of: Firstly, dividing the model parameters into two parts, and the parameters in the first part are set to initial values, and the ones in the second part are identified with a least square method. Secondly, determining whether the obtained values of the second part meet the requirements of the equivalent circuit model of battery. If the requirements are not met, the parameters that do not meet the requirements in the second part are set to zeros. Then, the parameters in the first part are identified with the least square method. Otherwise, the ones in the first part are directly identified with the same method. Terminating the iteration process until all the parameters meet the requirements.

公开(公告)号：US20240369642A1

公开(公告)日：2024-11-07

申请号：US18038259

申请日：2022-10-17

Applicant: SHANDONG UNIVERSITY

Inventor： Bin DUAN ,  Peng HUANG ,  Chenghui ZHANG ,  Yongzhe KANG ,  Yunlong SHANG

IPC: G01R31/392 ,  G01R31/367 ,  G01R31/3828 ,  G01R31/3842 ,  G01R31/389

Abstract: A method and system for evaluating power battery aging state and screening retirement, wherein the method includes: performing first-level screening according to appearance and voltage data of a power battery; obtaining charging test data in a set time of the power battery subjected to the first-level screening, performing derivation and secondary derivation based on a capacity-voltage curve of the battery, respectively extracting a first index and a second index of a set peak of the derivated curve, and respectively using the first index and the second index to determine a battery category and consistency, thereby realizing second-level screening; and performing third-level screening on the battery subjected to the second-level screening based on a direct current internal resistance of the battery. By using the method and system, the detection time can be effectively reduced, the screening test cost can be reduced and the evaluation and screening precision can be improved.

公开(公告)号：US20200169097A1

公开(公告)日：2020-05-28

申请号：US16492836

申请日：2017-10-19

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG ,  Yunlong SHANG ,  Qi ZHANG ,  Naxin CUI ,  Bin DUAN

IPC: H02J7/00

Abstract: A modularization system and a method for battery equalizers based on multi-winding transformers. By the inverse-parallel connection of the secondary sides of the odd and the even multi-winding transformers, the balancing in battery modules and between the odd and the even groups is realized based on forward conversion, and the balancing between the odd and the even groups and the automatic demagnetization for the transformers are realized based on flyback conversion. By only using a pair of complementary control signals, the direct, automatic and simultaneous balancing from any battery cell to any battery cell in the battery strings can be realized, thereby greatly improving the balancing efficiency and speed, and effectively improving the consistencies between the battery cells. The system has the advantages of high balancing efficiency, fast balancing speed, small size, low cost, high reliability, easy modularization, simple control, and nonuse of voltage detection circuits and demagnetizing circuits, etc.

公开(公告)号：US20250012868A1

公开(公告)日：2025-01-09

申请号：US18763074

申请日：2024-07-03

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG ,  Yunlong SHANG ,  Teng WANG ,  Yuhao ZHU

IPC: G01R31/392 ,  G01R31/387 ,  H01M10/54 ,  H02J7/00

Abstract: A method for standardizing a decommissioning definition of power batteries, including: obtaining power battery capacity data and SOH data; obtaining capacity degradation gradient by subtracting battery capacity of current charge-discharge cycle by battery capacity of previous charge-discharge cycle, and obtaining index of decommissioning (IoD) of power battery by dividing capacity degradation gradient by a square of SOH of current charge-discharge cycle; and when IoD is less than a set threshold, dismantling, disassembling and separating the power battery; otherwise, continuing to use the power battery. An aging state of battery is evaluated comprehensively based on two indexes—the SOH and the capacity degradation gradient, so that a new IoD of the battery is proposed. Each cell can be comprehensively evaluated according to various real-time states of battery, thereby achieving individual decommissioning, which ensures safe use of battery and increases the utilization rate of battery.

公开(公告)号：US20200175212A1

公开(公告)日：2020-06-04

申请号：US16493547

申请日：2017-10-19

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG ,  Yunlong SHANG ,  Qi ZHANG ,  Bin DUAN ,  Naxin CUI ,  Zhongkai ZHOU

IPC: G06F30/20 ,  H02J7/00 ,  G01R31/367 ,  H01M10/42

Abstract: A fractional-order KiBaM battery model considering nonlinear capacity characteristics and a parameter identification method includes a temporary capacity portion and an available capacity portion for describing nonlinear capacity characteristics of a battery, wherein the temporary capacity portion represents the power that can be directly obtained during the discharge, indicating the state of charge (SOC) of the battery; the available capacity portion represents the power that cannot be directly obtained, and such two portions are connected; when the battery is discharged, the load current i flows out from the temporary capacity portion, and a power passing rate coefficient of such capacity portions is obtained; and the nonlinear capacity effect and recovery effect of the battery are denoted by the height ratio of the temporary capacity and available capacity portions in view of the magnitude of the fractional order of battery capacity characteristics.