A non-contact power battery impedance measurement and charging device

Abstract

The invention relates to a non-contact power battery impedance measuring and charging device. A charging relay and a first rectifier filter are connected in series and then are respectively connectedwith an impedance measuring relay in parallel, the first end of the impedance measuring relay after parallel connection is connected with a receiving coil, and the other second end is connected to a plurality of battery module selection switches. The battery impedance is measured by using the alternating current in the non-contact power battery charging device and the power battery is heated, so that the battery impedance is measured by using the wireless charging equipment, the charging current and voltage of the battery can be updated in real time according to the battery impedance measuredin real time, and the optimal current and voltage charging is realized. Real-time updating of the power battery parameters can be updated in real time according to the battery impedance measured in real time, and estimation of the power battery state parameters is more accurate. The alternating current heating frequency, current and power parameters of the battery can be updated in real time according to the battery impedance measured in real time, the variable frequency heating temperature rise rate is higher, and the control accuracy is high and simple.

Description

technical field [0001] The field of low-temperature heating, impedance measurement and charging of a power battery, in particular relates to a non-contact power battery impedance measurement, charging and heating device. Background technique [0002] At present, there is no implementation device for impedance measurement in the vehicle environment. The online vehicles of the prior art need to add specific external excitation equipment, such as the patent application CN109254251. The external excitation signal generation unit generates sinusoidal excitation with a certain frequency, but it does not have the vehicle conditions. . The process is cumbersome and the equipment is inflexible and poorly adaptable, which cannot well meet the current needs of timely updating of vehicle power battery parameters; [0003] Another way to calculate impedance is through modeling, which has many shortcomings such as inaccurate modeling and large errors in impedance calculation. [0004] T...

AI Technical Summary

Problems solved by technology

The process is cumbersome and the equipment is inflexible and poorly adaptable, which cannot well meet the current needs of timely updating of vehicle power battery parameters;

[0003] Another way to calculate impedance is through modeling, which has many shortcomings such as inaccurate modeling and large errors in impedance calculation.

[0004] There is also an existing off-vehicle impedance measurement device that is mostly based on an electrochemical workstation, and the AC impedance method can accurately obtain battery impedance information, but the equipment is bulky and not suitable for the measurement of on-board impedance.

[0005] Prior art CN110554327, although the battery charge and discharge step signal used at that time did not use an external AC sinusoidal excitation during vehicle charging, the measurement accuracy is insufficient

[0006] Most of the existing battery preheating technologies are based on PTC heating, but PTC heating has disadvantages such as low heating efficiency, poor uniformity, high safety hazards, poor control accuracy, and slow heating rate;

[0007] Traditional liquid heating will greatly reduce the energy density of the power battery, and there are also problems such as low heating efficiency and slow heating rate

[0008] In recent years, although the latest battery internal heating resistor technology has improved the heating rate, there are also problems such as high control costs and too complicated control. Currently, the existing methods cannot effectively solve the problem of battery warm-up in a short time.

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