Efficient and passive balancing control method for lithium ion battery for electric vehicle
A lithium-ion battery, passive equalization technology, applied in electric vehicles, battery circuit devices, current collectors, etc., to achieve the effects of improving equalization efficiency, eliminating inconsistencies, and avoiding damage to voltage acquisition chips and acquisition circuits
Active Publication Date: 2015-02-25
CHONGQING CHANGAN AUTOMOBILE CO LTD
View PDF6 Cites 19 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] Aiming at the above problems, the present invention proposes a high-efficiency passive equalization control method for lithium-ion batteries for electric vehicles. By controlling the equalization temperature and the number of equalization cells, the battery cells with high voltage are discharged, so as to achieve the same level as the cells with low battery voltage. purpose of maintaining consistency
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
[0023] In order to better illustrate the present invention and facilitate the understanding of those skilled in the art, the implementation process of the present invention will be described below in conjunction with the accompanying drawings and specific embodiments.
[0024] figure 1 Shown is a flow chart of a passive equalization control method according to an embodiment of the present invention.
[0025] In one embodiment, the battery pack includes the smallest cell with the lowest voltage, includes all the cells whose voltage value is greater than the minimum cell voltage, and includes cells whose voltage difference from the smallest cell is greater than a preset threshold N batteries, including M single batteries that are currently allowed to enable equalization at the same time. When M
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 provides an efficient and passive balancing control method for a lithium ion battery for an electric vehicle. Battery cells high in voltage are discharged by controlling the balancing temperature and the balancing number of the battery cells, and therefore the aim of keeping the coincidence between the battery cells high in voltage and the battery cells low in battery voltage is achieved. A battery pack comprises the minimum battery cell with the lowest voltage, comprises the battery cells with the voltage higher than the voltage of the minimum battery cell, comprises N battery cells with the difference values between the voltage of the N battery cells and the voltage of the minimum battery cell larger than a threshold value, and comprises M battery cells which currently allow balancing to be simultaneously started. When M is smaller than N, the first M battery cells with the highest voltage are selected from the N battery cells for balancing starting, and when the highest voltage of the battery cell in the M battery cells is lower than the highest voltage, generated when balancing is not started, of the battery cells, balancing judgment is carried out again; on the contrary, balancing of the N battery cells is started, and balancing judgment is carried out again after the balancing is continued for a period of time.
Description
technical field [0001] The invention relates to a lithium-ion battery management system of an electric vehicle, in particular to a battery equalization control method. Background technique [0002] For a battery pack composed of multiple cells, the capacity state of each cell is different due to the difference in temperature and the inconsistency of the charging and discharging efficiency of the battery. The goal of passive equalization is to discharge the cells with high capacity to the same level as those with low capacity, so as to achieve the purpose of capacity balance in the process of charging and discharging. [0003] The existing passive equalization technology patent "Battery Equalization Device" with the patent number of "CN201010572115.X" only describes the discharge of high-capacity batteries through parallel resistance. During the discharge process, the resistance heats up, and the temperature of the voltage acquisition chip will continue to rise. The more the...
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): H02J7/00
CPCH02J7/342
Inventor 丁灿杨辉前姚振辉周安健苏岭邓柯军郭晓甜贺刚刘波
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Try Eureka
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap