Lithium ion battery quick charging method
A lithium-ion battery and battery cell technology, which is applied in secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve problems such as large error and lithium analysis, save time and reduce error risk , Guarantee the effect of feasibility and safety
Active Publication Date: 2020-04-17
HEFEI GUOXUAN HIGH TECH POWER ENERGY
View PDF5 Cites 5 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In the actual use of batteries, the biggest disadvantage of the charging process is the phenomenon of lithium precipitation, and the results obtained by charging at a constant rate and then dismantling are not so regular and the error is too large
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 Construction
[0026] The present invention will be further described below in conjunction with accompanying drawing:
[0027] like Figure 1-3 As shown, the lithium-ion battery fast charging method of the present invention specifically includes the following steps:
[0028] Step 1: Calibration of the support rate for fast charging in stages:
[0029] (1) Discharge the fully charged cell to 2.8V at a constant current of 0.33C at 25°C, and use the ampere-hour integral method to calculate the cell capacity Q;
[0030] (2) Divide the 0-80% SOC interval into several intervals with 20% as an interval, and charge the constant current to 20%, 40%, 60%, and 80% SOC at different rates in the empty state, and obtain 0~20%SOC, 0~40%SOC, 0~60%SOC, 0~80%SOC supported charging rate C1, C2, C3, C4;
[0031] (3) Empty cells are charged to 20% SOC with C1, and then charged to 40%, 60%, and 80% SOC at different rates to obtain 20-40% SOC, 20-60% SOC, 20- Charge rate C5, C6, C7 supported by 80% SOC;
[00...
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 a lithium ion battery quick charging method, which comprises the following steps of: (1) conducting calibration according to a staged quick charging support multiplying power:discharging a full-state battery cell to a set voltage value at a set constant current, and calculating the capacity of the battery cell, setting an SOC interval of the battery cell capacity, dividing the SOC interval into a plurality of to-be-tested intervals, respectively conducting charging to set values in the SOC interval at different multiplying powers in an empty state in a constant-current manner, and obtaining charging multiplying powers in different SOC intervals, (2) staged fast charging verification: setting an SOC interval, and dividing the SOC interval into a plurality of continuous verification intervals for charging verification, if the solid-liquid phase potentials of the negative electrode are both more than 0V, selecting the staged quick charging multiplying power for charging, and if the solid-liquid phase potential of the negative electrode is lower than 0V at a certain section of SOC, lowering the charging rate of the section of SOC to perform continuous quick charging verification until the solid-liquid phase potential of the negative electrode is higher than 0V. The quick charging mode of the battery cell can be quickly obtained, and the performance of thebattery cell is greatly improved and exerted.
Description
technical field [0001] The invention belongs to the technical field of lithium ion battery charging, and in particular relates to a lithium ion battery fast charging method. Background technique [0002] Lithium batteries have the advantages of high power density, high energy density, long cycle life, high output voltage, and environmental protection. They are widely used in various fields. Improving the charging rate, service life and available capacity of lithium batteries is a current research hotspot. [0003] At present, in the fast charging strategy of most OEMs and battery manufacturers, the constant current and constant voltage method is used for direct charging in the range of 0-80% SOC. Reduce the charging current to 0.05C cut-off, this traditional charging mode is single, the parameters are fixed, and it may not be able to achieve the purpose of fast charging. [0004] The supported charging rate of the lithium-ion battery charging process is affected by the SOC ...
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 Applications(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/44H01M10/448H01M10/0525Y02E60/10
Inventor 夏厚勇厉运杰孙言飞韩威振樊煜陈虎
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY