Voltage transformation charging device based on hub motor regenerative braking of BMS and control method
A technology of regenerative braking and in-wheel motor, which is applied to battery/fuel cell control devices, power consumption devices, electric braking systems, etc., can solve the problems of loss of battery power, dissipation, complex structure, etc., to avoid energy loss , the effect of reducing costs
Inactive Publication Date: 2018-05-04
JIANGSU UNIV
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Problems solved by technology
However, using this method has the following defects: 1) In order to realize the bidirectional control function of electric energy, the bidirectional power control circuit has a more complicated structure and higher manufacturing cost than the unidirectional power control circuit; 2) The process of braking energy recovery In the power control circuit, the high-frequency power switch and other components will dissipate part of the regenerative braking energy into heat energy, which affects the braking energy recovery efficiency
However, whether it is an energy consumption type or an energy transfer type, it will consume part of the power of the battery pack, reducing the cruising range of the electric vehicle
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[0022] The invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] like figure 1 As shown, the hub motor regenerative braking system used in the present invention mainly includes a wheel 1, a hub motor 2, a vehicle controller 3, a BMS central controller 4, a power battery pack 5, and a bridge rectifier 6; wherein one end of the hub motor 2 The nut is rigidly connected and concentric with the hub of the wheel 1. The three-phase winding in the hub motor 2 is connected to the charging and discharging interface of the power battery pack 5 through the rectifier bridge 6. The power battery pack 5 is embedded with a BMS central controller 4, BMS The central controller 4 is connected to the vehicle controller 3 with signals.
[0024] like figure 2 As shown, the hub motor electric vehicle power battery pack 5 is composed of several parallel power battery modules, BMS central controller 4 and power battery p...
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The invention discloses a voltage transformation charging device based on hub motor regenerative braking of a BMS and a control method. The voltage transformation charging structure comprises multiplepower battery modules connected in parallel, a BMS center controller and a power battery pack shell. Single power batteries in the power battery modules are connected in series and connected with control switches in parallel, and the adjacent control switches are connected in series. The single power batteries are further connected with battery detection modules in parallel, and the BMS center controller can control powering on and off of all switches in a power battery pack in real time. The control method includes the following steps that 1, the ideal terminal voltage value of the power battery pack is determined; 2, the power battery modules participating in braking energy recovery are selected; 3, the single power batteries participating in braking energy recovery are selected; 4, theterminal voltage value of the power battery pack is reduced gradually. According to the voltage transformation charging device based on hub motor regenerative braking of the BMS and the control method, the variable and adjustable function of the terminal voltage value of the power battery pack is achieved through voltage transformation charging control, and the influence of imbalance of the electricity amount of the single batteries on the use performance is weakened.
Description
technical field [0001] This article belongs to the technical field of regenerative braking control of in-wheel motor electric vehicles, and in particular relates to a BMS-based variable voltage charging device and control method for in-wheel motor regenerative braking. Background technique [0002] In-wheel motor drive technology integrates components such as power, transmission, vibration reduction and cooling in the wheel hub, which effectively simplifies the vehicle structure and improves transmission efficiency, and has become one of the current research hotspots in the automotive industry. The popularization of hub motor electric vehicles needs to overcome the key problems of "short driving range" and "high initial cost". The key to solving this technical problem is to develop high-performance power batteries, but it is difficult to achieve substantial breakthroughs in power battery technology in the short term. Regenerative braking technology can convert the kinetic e...
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IPC IPC(8): B60L11/18B60L7/10
CPCB60L7/10B60L58/19B60L58/22B60L2220/44Y02T10/70
Inventor 何仁王骏骋
Owner JIANGSU UNIV