A control system and method for a battery pack
A control method and technology for a control system, which are applied in the field of control systems of battery packs, can solve problems such as large energy consumption, low balancing efficiency, and heat generation, and achieve the effects of reducing energy consumption and improving balancing efficiency.
Active Publication Date: 2019-12-03
CHANGZHOU IND TECH RES INST OF ZHEJIANG UNIV
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is: in order to solve the problems of low equalization efficiency, large energy consumption and serious heat generation in the existing battery equalization method, the present invention provides a battery pack control system and method to solve the above problems
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[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0051] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Axial", "Radial", "Circumferential", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description,...
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The invention provides a control method of a battery pack. The control method comprises the following steps: (S1) collecting a voltage value V0 of each unit cell in the battery pack, calculating an average value Va of the voltage values and a variance theta; (S2) making comparison on the variance theta and a preset value theta0, when the theta is more than theta0, carrying out discharging balancing on the unit cells: (P1) when theta is more than theta0 and less than theta1, discharging the unit cell with the highest voltage value V0, and stopping until theta is less than theta 0; (P2) when theta is more than theta1 and less than theta2, discharging all the unit cells with the voltage value V0 more than the average value Va, and stopping theta is less than theta 0; and (P3) when theta more than theta2, discharging the unit cells with the voltage values V0 more than Vmin, and stopping until theta is less than theta0, wherein Vmin is the voltage value of the unit cell with the minimum voltage. According to the control method, different discharging balancing manners are reasonably arranged according to different dispersion degrees of voltage values of the unit cells, so that the balancing efficiency is integrally improved, and the energy consumption is reduced.
Description
technical field [0001] The invention relates to the technical field of battery management, in particular to a control system and method for a battery pack. Background technique [0002] In recent years, new energy vehicles such as electric vehicles are developing rapidly, and power batteries, as the heart of electric vehicles, require efficient and reliable management, so as to ensure the safety and economy of vehicles and prolong the service life of batteries. [0003] The battery management system (BMS) is an electronic device that can monitor and manage the battery. It collects and calculates parameters such as voltage, current, temperature, and SOC (battery state of charge), and then controls the charging and discharging process of the battery to achieve Protect the battery, improve the performance and life of the battery. [0004] Due to the difference of battery cells, the state of each battery cell will be different during the charging and discharging process. Theref...
Claims
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IPC IPC(8): H01M10/42H01M10/44B60L58/22B60L58/24
CPCB60L58/21H01M10/4207H01M10/425H01M10/441H01M10/448H01M2010/4271Y02E60/10Y02T10/70
Inventor 杨国青吕攀李红戴超杰
Owner CHANGZHOU IND TECH RES INST OF ZHEJIANG UNIV