Method and device for realizing balanced charging of automobile battery pack
A car battery and balanced charging technology, which is applied in the field of car battery systems and car charging circuits, can solve the problems of affecting the capacity of the battery pack, scrapping the battery pack, and incomplete discharge of the battery pack, etc.
Inactive Publication Date: 2017-11-28
SAIC MOTOR
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
After the lithium-ion battery pack has been used for a period of time, there will be inconsistent internal resistance and different aging degrees of the cells, which will cause the capacity mismatch between the battery cells and affect the capacity of the entire battery pack.
Specifically, when the capacity of a certain battery cell in the battery pack is smaller than that of other battery cells, once it reaches the full charge voltage, the entire battery pack will be stopped charging, while the other battery cells have not yet reached the full charge voltage. On the other hand, when the battery pack is discharging, when the voltage of the battery cell with the smallest capacity reaches the cut-off voltage, the entire battery pack will stop discharging, while other battery cells still have remaining capacity at this time, which will Incomplete discharge of the battery pack
In the long run, the battery cell with the smallest capacity will degrade faster than the other battery cells, and the capacity loss will be accelerated after multiple charge / discharge cycles, resulting in the failure of the entire battery pack
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
[0043] The specific embodiments are described below to illustrate the present invention by referring to the figures. However, it should be understood that these specific embodiments are only exemplary, and have no limiting effect on the spirit and protection scope of the present invention.
[0044] In this specification, the word "coupling" should be understood as including the situation of direct transmission of energy or signals between two units, or the situation of indirect transmission of energy or signals via one or more third units, and the Signals include, but are not limited to, those in electrical, optical, and magnetic forms.
[0045] Words such as "comprising" and "comprising" mean that in addition to the units and steps that are directly and explicitly stated in the specification and claims, the technical solution of the present invention does not exclude other units that are not directly or explicitly stated. and step situations. Furthermore, terms such as "fir...
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 an automobile electronic technology, in particular to an automobile charge circuit, an automobile battery system comprising the charge circuit and a method for realizing equalizing charge of an automobile. The automobile battery charge circuit according to the embodiment of the invention comprises an energy storage capacitor and a plurality of charge and discharge units, wherein each charge and discharge unit comprises a MOSFET (Metal-Oxide -Semiconductor Field Effect Transistor), a first coil and a flywheel diode; the MOSFET and the first coil are connected to the two ends of the respective corresponding energy storage unit in series; a positive electrode of the flywheel diode is grounded through the energy storage capacitor, and a negative electrode of the flywheel diode is connected to a common point of the MOSFET and the first coil; when the voltage of one energy storage unit is greater than average voltage of the energy storage units connected in series together, the turn-on time of the MOSFET is increased by controlling the gate voltage of the MOSFET connected with the energy storage unit.
Description
technical field [0001] The invention relates to automobile electronic technology, in particular to an automobile charging circuit, an automobile battery system including the charging circuit and a method for realizing balanced charging of automobiles. Background technique [0002] Energy saving and environmental protection are becoming the goals of the development of the automobile industry. Under this background, the development of electric vehicles is widely favored. One of the key technologies for electric vehicles is battery technology, including battery manufacturing and charging control. [0003] Electric vehicles generally use multiple lithium-ion battery cells connected in series as a power battery pack. After a lithium-ion battery pack has been used for a period of time, the internal resistance of the cells will be inconsistent and the aging degree will vary, which will cause the capacity mismatch between the battery cells and affect the capacity of the entire batt...
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): H02J7/00H01M10/44
CPCH02J7/0019H02J7/0086
Inventor 施骞邓恒张崇生郝飞
Owner SAIC MOTOR