Power battery AC heating method, device and electric vehicle

A power battery and heating method technology, applied in electric vehicles, secondary batteries, secondary battery repair/maintenance, etc., can solve problems such as lithium precipitation, and achieve the effect of improving the problem of lithium precipitation

Active Publication Date: 2022-08-09
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in practical applications, if the battery is heated using the above AC scheme, the battery will have a certain degree of lithium precipitation.

Method used

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  • Power battery AC heating method, device and electric vehicle
  • Power battery AC heating method, device and electric vehicle
  • Power battery AC heating method, device and electric vehicle

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Embodiment Construction

[0048] The present application will be further described below with reference to the accompanying drawings and specific embodiments. The described embodiments should not be regarded as a limitation to the present application, and all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0049] In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" can be the same or a different subset of all possible embodiments, and Can be combined with each other without conflict.

[0050] 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 applicat...

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Abstract

The invention discloses a power battery AC heating method, device and electric vehicle, and relates to battery technology. The method includes the following steps: obtaining battery power; when the battery power is greater than a first threshold, obtaining a bias current value ; Obtain the impedance model of the battery; detect the temperature of the battery, dynamically calculate the AC frequency according to the impedance model and the temperature of the battery; configure the bias current flowing through the battery according to the bias current value and The alternating current flowing through the battery is dynamically configured according to the alternating frequency. By configuring the DC bias, the present invention can effectively prevent the occurrence of lithium precipitation under the condition of rapid heating.

Description

technical field [0001] The present invention relates to battery technology, in particular to a power battery AC heating method, device and electric vehicle. Background technique [0002] In winter in high latitudes, the battery life and charging speed of new energy vehicles will decrease. This is because the internal resistance of lithium-ion power batteries is large at low temperatures, the output voltage during discharge is low, and lithium is easily precipitated during charging. The current general solution is to design a method in the thermal management system to heat the battery. There are two main types of technology, one relies on external heating sheet heat conduction, and the other relies on internal resistance of the battery to heat from the inside. [0003] The method of external heating relies on the PTC (Positive Thermal Coefficient) thermistor heating element of the battery pack. Alternatively, use the motor coil to generate heat to heat the liquid medium, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/615H01M10/625H01M10/637H01M10/48H01M10/42
CPCH01M10/615H01M10/625H01M10/637H01M10/486H01M10/425Y02T10/70
Inventor 方杰刘华涛张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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