Equalizing charging and discharging method for power type lithium-ion battery
A lithium-ion battery, balanced charge and discharge technology, applied in battery circuit devices, current collectors, electric vehicles, etc., can solve the problems of low energy usage rate of battery pack, inability to reflect voltage, battery over-discharge, etc.
Inactive Publication Date: 2013-11-13
HEFEI UNIV OF TECH
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However, the termination voltage of the battery pack cannot reflect the voltage of each single battery in the battery pack, so when the discharge is terminated, some batteries will appear "over-discharged", and some batteries may have remaining power that has not been used. Low
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[0027] Such as figure 1 shown. When the battery module 4 is charging and discharging, the detection circuit in the detection module 3 detects the voltage signal of each cell in the battery module in real time, and the detection module 3 transmits the detected voltage signal to the control module through data communication. After controlling the photoelectric isolation circuit inside the module 3, it is transmitted to the main control chip, and after the operation and processing by the main control chip, the state of each single battery is judged.
[0028] During the charging process, after the main control chip calculates and processes the voltage signals of each single battery, it determines which single battery is in the "overcharged state", and controls the balanced power module 2 through the main control chip for this battery. GPIO1 pin and detection module 3, open the balanced discharge circuit inside the detection module 3, and deal with the parallel resistance of the c...
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The invention discloses an equalizing charging and discharging method for a power type lithium-ion battery, which is used for realizing the automatic equalization of a battery in charging and discharging according to single battery voltages. A device comprises a control module, an equalization power module, a detection module and a battery module, wherein the control module internally comprises an optical coupling circuit part for isolating signals and a master control chip part; the detection module is integrated with a voltage detection circuit, an equalizing charging circuit and an equalizing discharging circuit; the on / off switching of the equalizing charging circuit and the equalizing discharging circuit is realized by an optical coupler in the control module and a control gate of the master control chip to realize the equalizing charging of any given battery and the equalizing discharging of given batteries; and the detection module and the battery module both can realize the detection of a plurality of series-wound battery modules in a concatenated way.
Description
technical field [0001] The invention relates to the field of battery charging and discharging control devices for new energy vehicles, in particular to a method for balancing charging and discharging of a power lithium ion battery. Background technique [0002] Batteries are widely used in various fields, especially in recent years, the country has vigorously developed the new energy vehicle industry represented by hybrid vehicles, pure electric vehicles and fuel cell vehicles. The development of new energy vehicles is gradually moving towards industrialization. Power lithium batteries, Ni-MH batteries are considered as one of the key components. When charging a battery pack that works in series, how to ensure that the individual cells in the battery pack are quickly and effectively balanced during the charging and discharging process is the key to ensuring the safety and reliability of power lithium-ion batteries and nickel-metal hydride batteries. It is a key technology t...
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IPC IPC(8): H02J7/00
Inventor 韩江洪刘征宇张利张建军王跃飞
Owner HEFEI UNIV OF TECH