Self-heating method, device and system of power battery and electric vehicle

A power battery, self-heating technology, used in secondary batteries, secondary battery repair/maintenance, circuits, etc., to avoid lithium deposition and dendrite formation, and avoid polarization effects.

Pending Publication Date: 2022-02-18
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there may be a problem that the frequency of the control signal is lower than the lowest frequency point of the electrochemical reaction process of the power battery in the electrochemical impedance spectroscopy test, resulting in lithium deposition and dendrite formation

Method used

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  • Self-heating method, device and system of power battery and electric vehicle
  • Self-heating method, device and system of power battery and electric vehicle
  • Self-heating method, device and system of power battery and electric vehicle

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Embodiment Construction

[0046] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0047] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

[0048] Techniques, methods and devices known to persons of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, techniques, methods and devices should be considered part of the description.

[0049] In all examples shown and discussed herein, any specific values ​​should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have differ...

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PUM

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Abstract

The invention relates to a self-heating method, device and system for a power battery and a vehicle, and the method comprises the steps: starting a self-heating process in response to a signal entering the self-heating process, and enabling a self-heating control circuit to control the self-heating circuit to charge and discharge the power battery according to a preset control signal to realize the alternating current self-heating of the power battery ; acquiring a current signal and a voltage signal of the power battery in an alternating current self-heating process; determining a phase difference between the current signal and the voltage signal; and performing corresponding processing on the frequency of the control signal according to the phase difference.

Description

technical field [0001] Embodiments of the present disclosure relate to the technical field of battery self-heating, and more specifically, to a self-heating method for a power battery, a self-heating device for a power battery, a self-heating system for a power battery, and an electric vehicle. Background technique [0002] With the improvement of people's awareness of environmental protection, electric vehicles have developed rapidly in recent years. As an important energy storage device for electric vehicles, lithium-ion batteries have the characteristics of high specific power, high energy density, and low self-discharge rate. However, the performance of lithium-ion batteries deteriorates at low temperatures, the impedance increases, the usable capacity drops sharply, and the high-power charge and discharge capabilities also drop sharply. These disadvantages of lithium-ion batteries hinder the popularization of electric vehicles. [0003] In the prior art, a self-heatin...

Claims

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Application Information

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IPC IPC(8): H01M10/615H01M10/42H01M10/48H01M10/633H01M10/635H01M10/651H01M10/6571
CPCH01M10/615H01M10/633H01M10/635H01M10/6571H01M10/651H01M10/486H01M10/425H01M2010/4271Y02E60/10
Inventor 凌和平陈斯良熊永王宁宁颜亮
Owner BYD CO LTD
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