Power battery frequency conversion heating method, device and electric vehicle
A technology of power battery and heating method, which is applied in the direction of secondary battery, secondary battery repair/maintenance, circuit, etc. The effect of increasing the efficiency of heating
Active Publication Date: 2022-02-01
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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Problems solved by technology
[0004] In related technologies, when calculating the model, based on the impedance of the full battery, the current amplitude of the AC signal will be relatively small, resulting in a reduction in the heating effect of the battery
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[0059]In the following description, references to "some embodiments" describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or a different subset of all possible embodiments, and Can be combined with each other without conflict.
[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application, and are not intended to limit the present application.
[0061] In the related art, when using alternating current to heat the battery, the impedance of the battery is used to calculate the magnitude of the alternating current. However, in the related art, the magnitude of the heating current is based on the impedance of the full battery, including the inductive reactance of the indu...
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The invention discloses a frequency conversion heating method and device for a power battery and an electric vehicle, and relates to battery technology. The method includes the following steps: obtaining the first current amplitude according to the ratio between the difference between the upper limit voltage and the open circuit voltage of the device and the minimum impedance; The difference between the open circuit voltage and the lower limit of the safe voltage, and the smaller value of the difference between the upper limit of the safe voltage and the open circuit voltage is used as the minimum polarization voltage; when the AC frequency is the upper limit of the AC frequency according to the temperature and impedance model of the battery The charge transfer impedance of the charge transfer impedance; the second current amplitude is obtained according to the ratio of the minimum polarization voltage to the charge transfer impedance; the minimum value is selected from the upper limit current amplitude of the device, the first current amplitude and the second current amplitude as the target AC amplitude ; Determine the target AC frequency according to the target AC amplitude, and configure the AC. The invention can remove the impedance of the non-chemically active part when calculating the AC amplitude, increase the calculation result and increase the heating efficiency.
Description
technical field [0001] The invention relates to battery technology, in particular to a power battery frequency conversion heating method, device and electric vehicle. Background technique [0002] Since lithium-ion batteries store and release energy through electrochemical reactions, when the temperature is very low, the electrochemical reaction rate decreases and ion migration is slow, which is a great challenge to the energy storage and release of lithium-ion batteries. The current relatively common solution is to design an auxiliary system for heating the battery in the thermal management solution. There are two types of battery heating technologies commonly used, one relies on an external heat source to conduct heat to the inside of the battery, and the other relies on the Joule heating effect of the internal resistance of the battery to directly heat from the inside. [0003] Compared with external heating methods such as relying on electric heaters or heat pump heatin...
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IPC IPC(8): H01M10/615H01M10/625H01M10/637H01M10/48H01M10/42
CPCH01M10/615H01M10/625H01M10/637H01M10/486H01M10/425Y02E60/10
Inventor 方杰刘华涛张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD