A device and method for realizing lithium battery cell balance through MOS tube
A MOS tube and lithium battery technology, applied in battery circuit devices, circuit devices, and secondary battery repair/maintenance, etc., can solve the problems of large system energy loss, poor balance effect, and difficulty in accurate selection, and achieve low energy loss, The on-off control process is simple, and the effect of improving safety and stability
Active Publication Date: 2015-09-30
BEIJING LIANDONG TIANYI TECH
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Problems solved by technology
The main defect of this kind of resistance equalization method is: the resistance value of the resistor connected in parallel with each lithium battery cell is difficult to accurately select, if the resistance value of the resistance is too large, the equalization current is too small, and the equalization effect is poor; If the resistance value is too small, the resistance power will be large, resulting in large system energy loss
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[0025] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0026] like figure 1 As shown, a device for balancing a lithium battery cell through a MOS tube provided in an embodiment of the present invention is applied to a lithium battery composed of more than two lithium battery cells connected in series, including: A shunt unit connected in parallel, a voltage detection unit and a control unit installed between the input and output of each of the lithium battery cells; the input of the control unit is connected to the output of each of the voltage detection units The output terminal of the control unit is connected with the input terminal of each branch unit. Wherein, the shunt unit may be a MOS transistor, and the control unit includes a voltage comparator and a control signal drive circuit connected in sequence.
[0027] The present invention also provides a method for realizing the equalization of lithium...
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The invention provides an apparatus and a method for equalizing lithium battery cells via MOS tubes. The apparatus is applied in a lithium battery formed by more than two lithium battery cells connected in series. The apparatus provided by the utility model comprises a control unit, shunt units in parallel connection with the lithium battery cells and voltage detection units mounted between the input ends and the output ends of the lithium battery cells, wherein the input end of the control unit is connected with the output end of each voltage detection unit, and the output end of the control unit is connected with the input end of each shunt unit. Therefore, with the apparatus and the method for equalizing the lithium battery cells via the MOS tubes provided in the invention, the advantages of a simple structure, high reliability in use and good equalization of the lithium battery cells are obtained.
Description
technical field [0001] The invention belongs to the technical field of circuit control, and in particular relates to a device and method for realizing balancing of lithium battery cells through MOS tubes. Background technique [0002] Communication backup lithium batteries are usually composed of several, a dozen or even dozens of lithium battery cells connected in series to provide a higher voltage value to the outside world. For an ideal lithium battery, the voltage, resistance and capacity of each lithium battery cell should be consistent. However, in the production process of lithium batteries, many processes are required from the coating process to the final product. Even after strict testing procedures, it is difficult to ensure that the voltage, resistance and capacity of each lithium battery cell are consistent. and, along with the increase of the lithium battery charging and discharging times, the inconsistency between the lithium battery cells will gradually incre...
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IPC IPC(8): H01M10/42H02J7/00
CPCY02E60/10
Inventor 阎学科陈文
Owner BEIJING LIANDONG TIANYI TECH