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An improved safe charging method for power lithium battery

A charging method and lithium battery technology, applied in secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve safety accidents, cannot monitor the status of each single battery, and affect the use of power lithium batteries Time and other issues to achieve the effect of avoiding damage, ideal effect, simple and convenient operation

Active Publication Date: 2020-07-28
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Overcharging or over-discharging of each single battery in the power lithium battery will cause safety problems. The existing technology is to realize safe charging by setting a protection system for the power lithium battery, but it is impossible to monitor the status of each single battery. Once each single battery When the energy is inconsistent, it will affect the service life of the power lithium battery, and there will inevitably be a single battery with a slightly higher or lower voltage that is frequently overcharged or overdischarged, which may cause a safety accident after a long period of use

Method used

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  • An improved safe charging method for power lithium battery
  • An improved safe charging method for power lithium battery
  • An improved safe charging method for power lithium battery

Examples

Experimental program
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Embodiment 1

[0038] In this embodiment, a Panasonic power lithium battery with a model number of NCR18650B-MH12210 is used as the charging object, the voltage range is 3.0-4.2V, and the capacity is 2900mAh. like figure 1 and figure 2 As shown, the power lithium battery is charged in a safe and fast way, and the entire charging process is controlled and recorded by the battery intelligent management system, which specifically includes the following steps:

[0039] S1, drawing the dQ / dV standard curve of the Panasonic brand power lithium battery whose model is NCR18650B-MH12210;

[0040] S2. Charge the target lithium battery of the same type as step S1 with a constant current of 1.0C, draw a real-time dQ / dV curve and record the extreme value of dQ / dV;

[0041] S3. When the first peak of dQ / dV in step S2 appears, compare the corresponding voltage with the voltage corresponding to the first peak of dQ / dV on the standard curve in step S1, and the deviation between the two is not greater than...

Embodiment 2

[0057] In this embodiment, on the basis of the first embodiment, in the fast charging stage, the charging area within the range of adjacent peaks and valleys is charged by stepwise changing current method for illustration. The Panasonic brand power lithium battery with the model number NCR18650B-MH12210 is still used as the charging object, the voltage range is 3.0-4.2V, and the capacity is 2900mAh.

[0058] like image 3 As shown, the dQ / dV real-time curve of step S2 in the first embodiment is converted into a dQ / dV.VS.SOC curve. Between each peak and valley, the SOC interval is further divided according to the slope change of the curve as the platform interval for step current charging. Each interval from peak to trough and from trough to peak can be divided into three sections according to the slope change. like Figure 4 As shown, the curve is gentle in the area near the peak and trough, and the curve changes rapidly in the middle area. According to the slope change, it...

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Abstract

The invention discloses an improved power lithium battery safe charging method, which comprises the steps of: S1, drawing a dQ / dV standard curve of a lithium battery of a certain model; S2, charging atarget lithium battery of the same model as the lithium battery in the step S1 normally, drawing a dQ / dV real-time curve and recording a dQ / dV extreme value; S3, when a first peak value of dQ / dV in step S2 occurs, comparing a corresponding voltage with a voltage corresponding to a first peak value of dQ / dV on the standard curve in the step S1, and analyzing and judging whether the target lithiumbattery is in a safe state; S4, measuring and calculating consistency of internal resistance of each single battery or calculating internal resistance of a battery pack, and entering a fast charge phase when the consistency or the internal resistance meets the requirements; step 5, adopting a stepwise changing current method for charging in a charging range within a range of adjacent peak and valley values in the fast charge phase; S6, and adopting an electric vehicle manufacturer or Chinese standard recommended method for completing charging after the end of the fast charging phase. The improved power lithium battery safe charging method has the advantages of being fast, safe, convenient and good in effect.

Description

technical field [0001] The invention relates to the technical field of health management of power lithium batteries, in particular to an improved safe charging method for power lithium batteries. Background technique [0002] At present, electric vehicles usually use lithium batteries as the power source. Compared with power lead-acid batteries, power lithium batteries have the advantages of high energy density and long life. Common power lithium batteries include ternary batteries, LTO and LMO, etc. Among them, the ternary battery is nominally 3.7V, the LTO is nominally 2.4V, and the LMO is nominally 3.7V. Under the advocacy of the theme of energy saving and environmental protection, electric vehicles will gradually replace fuel vehicles as one of people's travel tools, making how to quickly and safely charge power lithium batteries has become an urgent problem to be solved. [0003] Overcharging or over-discharging of each single battery in the power lithium battery will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44
CPCH01M10/44H01M10/441Y02E60/10
Inventor 时玮李丹勇蔡文川刘欢康鑫韩甜
Owner BEIJING JIAOTONG UNIV