A method for online estimation of state of charge of lithium-ion battery

A lithium-ion battery, state of charge technology, applied in the direction of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of inability to use online monitoring, difficulty in measuring open circuit voltage, initial SOC value, current acquisition accuracy, charge and discharge efficiency high impact issues

CN102930173BActive Publication Date: 2016-07-06深蓝汽车科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-07-06

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Abstract

The invention discloses an SOC (state of charge) online estimation method for a lithium ion battery. The SOC online estimation method comprises the following steps: recognizing characteristic parameter values of the battery online; recognizing real-time SOC of the battery online; revising the battery SOC through ampere-hour integral estimation to obtain revised SOC; and weighing the real-time SOC and the revised SOC to obtain final SOC of the battery. By the SOC online estimation method, online estimation capability of battery characteristic parameters can be improved; evaluation self-adaptive capability of the SOC is stronger, and reliability is higher.
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Description

technical field

[0001] The invention relates to the technical field of lithium-ion batteries for new energy vehicles, and more specifically, relates to an online estimation method for the state of charge of a lithium-ion battery. Background technique

[0002] With the gradual deterioration of the global climate, the increase of urban air pollution and the excessive consumption of oil resources, more and more people in the automotive field are turning their attention to new energy vehicles. Lithium-ion batteries have excellent performances such as small size, high energy density, long storage life, no memory effect, high voltage and low self-discharge rate, and have gradually become the winners of new energy vehicle power batteries. How to make good use of batteries has become a key technology in the field of batteries and their integration, among which accurate monitoring of battery state of charge (State of Charge, SOC) has become a difficult and hot issue in the research o...

Examples

Embodiment Construction

[0051] 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 part of the embodiments of the present invention, not all of them. 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.

[0052] The embodiment of the present invention discloses an online estimation method for the state of charge of a lithium-ion battery, so as to improve the online estimation capability of battery characteristic parameters, so that the estimation of the state of charge has stronger self-adaptability and higher reliability.

[0053] Such as figure 1 As shown, a lithium-ion battery state of charge online estimation method, including:

[0054] S1. On-lin...