Method for evaluating lithium ion battery peak power online

A lithium-ion battery and peak power technology, which is applied in the field of lithium-ion batteries, can solve problems such as the inability to predict battery peak power online in real time, and achieve the effects of avoiding shortened battery life, ensuring safety, and reducing risk factors

Active Publication Date: 2014-03-26
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These four methods all refer to performing pulse discharge under different SOCs and calculating the peak power. According to the existing test methods, the peak power of the battery cannot be predicted online in real time.

Method used

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  • Method for evaluating lithium ion battery peak power online
  • Method for evaluating lithium ion battery peak power online
  • Method for evaluating lithium ion battery peak power online

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Experimental program
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Embodiment Construction

[0039] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0040] (1) Establish the influence curve of the peak power characteristic

[0041] Figure 1 ~ Figure 4 It is a schematic diagram of an embodiment of the present invention, taking a battery pack composed of high-power 8Ah lithium manganese oxide batteries connected in series as an example, referring to the description of the power evaluation method above, and completing the 10s peak power characteristic analysis.

[0042] a) When studying the relationship between the charging and discharging peak power and SOC of a lithium-ion battery, put the battery in an incubator, keep the battery temperature constant, charge the battery at 1C to the charging cut-off voltage, and let it stand for 1 hour.

[0043] b) Discharge the battery with a current of 1C for 6 minutes until the SOC is 90%, let it stand for 1 hour, and record the current temperature and open circuit v...

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Abstract

The invention discloses a method for evaluating lithium ion battery peak power online. The method comprises the following steps that influencing characteristic curves of the influence on lithium ion battery peak power by the charge state, Ohm internal resistance, temperature and sustainable time of a lithium ion battery are respectively built; all factors influencing the battery peak power are synthesized, and a battery peak power evaluation initial model is built; the battery peak power evaluation initial model is embedded into a vehicle-mounted terminal system, and the battery peak power evaluation initial model continues to be trained. The method has the advantages that the situations that due to the fact that the operation is not proper, and the battery is overcharged or overdischarged, the service life of the battery is shortened, and use cost is greatly increased are basically avoided through the method, the danger coefficient of the battery in the use process is lowered, and the reliability and stability of the operation of an electric vehicle are improved, and personal safety and equipment safety are guaranteed.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an online evaluation method for peak power of lithium ion batteries. Background technique [0002] As the power source or auxiliary power source of electric vehicles, the development of power batteries is particularly important. Generally, electric vehicles have the following basic requirements for power batteries: high specific energy, high specific power, less self-discharge, longer cycle life, better charge and discharge performance, good consistency of battery packs, low price, good safety performance, easy to use Easy maintenance, no environmental pollution and other problems. Lithium-ion batteries have high specific energy and specific power, do not pollute the environment, have low self-discharge rate, and have no memory effect. Lithium-ion battery life has a significant impact. [0003] The power characteristics of the battery are usually measured by the peak power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G01R21/00
Inventor 娄婷婷李建祥黄德旭曹际娜张秉良唐方庆
Owner STATE GRID CORP OF CHINA
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