A method for controlling equalized charging of battery pack cells
A single battery, balanced charging technology, applied in the field of power supply technology and power electronics, can solve problems such as safety accidents, reduced battery life, and reduced overall capacity of the battery
Active Publication Date: 2014-10-22
安徽登冠新能源电动车科技有限公司
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Problems solved by technology
Otherwise, with the increase of charge and discharge times, the overall capacity of the battery pack will continue to decrease, resulting in a reduction in battery pack life and sometimes safety accidents.
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[0056] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0057] Such as figure 1 As shown, the present invention utilizes the battery pack unit cell balance charge controller used in the charging method of the battery pack unit cell balance charge controller, and (n+1) fast Fuses F1, F2,..., Fn, F(n+1), n DC relays S1, S2,..., S(n-1), Sn with two pairs of normally open contacts, resistors R1, Hall Err-type non-contact current sensor HA, energy storage inductor L, two N-channel power MOSFET tubes M1, M2, three Schottky diodes D1, D2, D3, energy storage capacitor C, eight silicon fast recovery diodes D4, It consists of D5, D6, D7, D8, D9, D10, D11, and the battery equalization charge control management unit of the battery unit.
[0058] The (n+1) pins BP, N1, N2, ..., N(n-2), N(n-1), and BN of the battery pack connecting plug CT are respectively connected with (n+1) wires One ends of the (n+1) f...
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The invention discloses a method for controlling equalizing charge of an elementary cell of a battery pack. The control method is realized on a controller with a boost-buck circuit as a core, wherein the boost-buck circuit is formed by two energy storage elements of an inductor and a capacitor, two power MOSFETs (Metal-Oxide -Semiconductor Field Effect Transistor) and two Schottky diodes. According to an equalizing charge circuit in the controller, a second order oscillating circuit formed by the inductor and the capacitor is utilized, and the aims that the elementary cell with higher volume boost charges the capacitor and the capacitor buck charges the elementary cell with lower volume are realized through on-off control of power switch tubes, so that energy transfer between every two elementary cells with tiny supply voltage difference is quickly and conveniently realized. The control method is realized through process control of a digital signal processor, so that all procedures such as precharge of an energy-storage capacitor, routing inspection and storage of power voltage of each elementary cell of the battery pack, the aim that the elementary cell with higher volume transfers energy to the elementary cell with lower volume, and failure warning can be step-by-step completed.
Description
technical field [0001] The invention relates to the fields of power supply technology and power electronics technology, in particular to a method for controlling equalized charging of battery cells. Background technique [0002] A battery pack consists of a series of series of cells, each with a nominal voltage of a few volts. Due to the differences in the performance of each unit battery, the power supply voltage of each unit battery will appear inconsistent after the battery pack is used for a certain number of times, that is, after multiple rounds of charging and discharging. When in use, each unit battery can neither be overcharged nor overdischarged; otherwise, if one unit battery is damaged, the entire battery pack cannot be used normally. [0003] In order to make the capacity of each unit battery of the battery pack fully exerted during the cycle use, the most ideal means is to take effective equalization charging measures for each unit battery when charging the pow...
Claims
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IPC IPC(8): H02J7/00
Inventor 沈勇环陈益广
Owner 安徽登冠新能源电动车科技有限公司