Electrochemical-thermal coupling model-based low-temperature heating method without lithium precipitation for lithium ion battery

A technology of a lithium ion battery and a heating method is applied in the application field of an electric vehicle battery management system, and can solve the problems of battery capacity lithium deposition damage, improper current amplitude, etc.

Active Publication Date: 2018-06-22
哈尔滨和睿科技有限公司
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Problems solved by technology

[0004] In order to solve the problem that the battery capacity is damaged by lithium analysis due to the improper selection of current amplitude during low-temperature heating of the existing battery, the present invention provides a lithium-ion battery-free lithium-ion low-temperature heating method based on an electrochemical-thermal coupling model

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  • Electrochemical-thermal coupling model-based low-temperature heating method without lithium precipitation for lithium ion battery
  • Electrochemical-thermal coupling model-based low-temperature heating method without lithium precipitation for lithium ion battery
  • Electrochemical-thermal coupling model-based low-temperature heating method without lithium precipitation for lithium ion battery

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[0105] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0106] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0107] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0108] The method for heating a lithium-ion battery at a low temperature without analytic lithium based on an el...

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Abstract

In order to solve the problem of lithium precipitation damage to capacity of a battery due to improper selected current amplitude during low-temperature heating of an existing battery, the invention provides an electrochemical-thermal coupling model-based low-temperature heating method without lithium precipitation for a lithium ion battery, and belongs to the field of application of an electric vehicle battery management system. The method comprises the following steps of 1, acquitting a pre-heating current limitation condition according to an electrochemical-thermal coupling model on the premise that metal lithium of the lithium ion battery is not precipitated, wherein the limitation condition conforms to a formula I: -1<={3*Q<n>*c<0.5><0>*(1-x<surf>)<0.5>(x<surf>)<0.5>*[(e<(F*U<n>) / (2*R*T)-(e<(-F)*U<n> / (2*R*T))]} / P<act>, formula II: U<min><=V<=U<max>, and V=E<ocv>-Eta<act-n>-Eta<con>-Eta<ohm>; and 2, performing low-temperature heating on the lithium ion battery according to the acquired pre-heating current limitation condition. By the method, damage to the battery during the internal heating process of the battery is prevented, the service lifetime of the battery is prolonged, and the safety of the battery system is improved.

Description

technical field [0001] The invention relates to a low-temperature heating method for a lithium-ion battery, in particular to a lithium-free low-temperature heating method for a lithium-ion battery based on an electrochemical-thermal coupling model, and belongs to the application field of battery management systems for electric vehicles. Background technique [0002] The outstanding features of lithium-ion batteries are high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and environmental protection. It is the preferred energy storage power source for electric vehicles. The following problems exist in the use of lithium-ion batteries when the ambient temperature is lower than 0°C: the impedance of the lithium-ion battery will increase significantly at low temperatures, resulting in a serious loss of charge and discharge capacity of the battery; forcibly charging the battery at low temperatures will cause the surface of the negativ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/615H01M10/625H01M10/65
CPCH01M10/615H01M10/625H01M10/65Y02E60/10
Inventor 吕超宋彦孔
Owner 哈尔滨和睿科技有限公司
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