On-line screening method for single performance in battery pack
A battery pack and screening method technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of low accuracy, shortened battery pack service life, and poor implementability of the battery pack, and achieve high accuracy and easy implementation Effect
Active Publication Date: 2022-06-14
SHANDONG ZHIYANG ELECTRIC
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0002] Due to the complex factors of the production process and the complex factors of the use environment in the battery pack, the performance of the same battery unit will deteriorate after use, and the degree is different. Even the battery that has just left the factory will have certain performance differences. During long-term use, the degree of deterioration will continue to increase, and the overall performance of the battery pack will be greatly affected
According to the barrel effect theory, the battery with the greatest degree of deterioration will become the largest load, causing the battery pack to be scrapped in advance and greatly reducing the service life of the battery pack
[0003] The traditional method is to replace all the battery packs that do not meet the performance, and recycle the old battery packs by physical and chemical methods or directly enter the secondary market for use. Even if they are directly used in the secondary market, there will still be batteries with good performance that cannot be used. To further play a role, the battery with a large degree of deterioration is still a load, and there is a waste of resources
A few methods are to replace some batteries with poor performance or to balance the batteries with poor performance. The battery performance screening methods used mainly include cell voltage judgment method, cell internal resistance judgment method, and cell SOC / SOH judgment method. The cell voltage judgment method and the cell internal resistance judgment method are simple to operate and highly implementable. However, due to the characteristics of the battery's own load, it is impossible to judge the quality of the battery from the cell voltage or the cell internal resistance, so the accuracy is relatively low. Low, the single SOC / SOH judgment method needs to charge and discharge the battery first to obtain the SOC / SOH of the battery, and this method is poorly applicable to the battery running online
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0025] The online screening method for the performance of the cells in the battery pack according to the present invention comprises the following steps:
[0026] a. Collect the cell voltage, cell temperature and cell internal resistance of each cell in the battery pack to form the original data structure [battery number, cell voltage, cell temperature, cell internal resistance], denoted as [i, V i , T i , R i ];
[0027] where i is 1, 2, ..., N, which is the number of cells in the battery pack;
[0028] b. Calculate the centroid of the original data composed of battery cell voltage, cell temperature and cell internal resistance, and denote it as
[0029] The calculation method of the centroid of the original data composed of the cell voltage, cell temperature and cell internal resistance of the battery pack described in step b is as follows:
[0030]
[0031] Among them, N is the total number of cells in the battery pack; i is 1, 2, ..., N, which is the cell number o...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to the technical field of battery monitoring, in particular to an online screening method for the performance of cells in a battery pack, which collects the cell voltage, cell temperature and cell internal resistance of each battery in the battery pack to form an original data structure [battery number , monomer voltage, monomer temperature, monomer internal resistance], denoted as [i, V i , T i , R i ]; Calculate the Euclidean distance d between the centroid of the four clusters and the centroid of the battery pack i , the cluster of the centroid with the farthest distance is the battery with the worst performance; the present invention combines the accurately measurable parameters cell voltage, cell temperature and cell internal resistance of the battery for cluster analysis, which has high accuracy, is easy to implement, and can be used For the replacement or equalization of batteries with poor performance in the battery pack, it can be extended to analyze the consistency of the battery pack.
Description
technical field [0001] The invention relates to the technical field of battery monitoring, in particular to an on-line screening method for the performance of cells in a battery pack. Background technique [0002] Due to the complex factors of the production process and the use environment in the battery pack, the performance of the same battery unit is deteriorated after use, and the degree is different, and even the battery that has just left the factory will have certain performance differences. During long-term use, the degree of deterioration will continue to increase, and the overall performance of the battery pack will be greatly affected. According to the barrel effect theory, the most deteriorated battery will become the largest load, causing the battery pack to be scrapped in advance, greatly reducing the service life of the battery pack. [0003] The traditional method is to replace all the battery packs that do not meet the performance requirements, and recycle ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/396G01R31/367
CPCG01R31/396G01R31/367
Inventor 赵砚青杨菲张立臣杨栋栋成明
Owner SHANDONG ZHIYANG ELECTRIC