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Sectional type constant voltage and constant current charging method

A technology of constant current and constant voltage, charging method, applied in the direction of secondary battery charging/discharging, circuits, electrical components, etc., can solve the problem of not considering the battery charging time, not considering the increase of the battery water loss rate, and prolonging the charging time.

Active Publication Date: 2014-01-01
重庆工业赋能创新中心有限公司
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Problems solved by technology

However, the method described in this invention patent has the following disadvantages: 1. In the constant current charging stage, the method does not consider that the charging current in the later stage of constant current charging is too large, which will lead to an increase in the water loss rate of the battery and a decrease in battery life; To a certain extent, reduce the water loss rate of the battery during the charging process, without considering the charging time of the battery, so forcing the current to drop in the later stage of charging will prolong the charging time

Method used

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  • Sectional type constant voltage and constant current charging method

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Embodiment Construction

[0018] A non-limiting embodiment is given below in conjunction with the accompanying drawings to further illustrate the present invention.

[0019] Before Joseph A. Mas proposed Maas's law, the research on charging technology was mainly designed based on the internationally recognized rules of thumb in 1940, the most famous of which was "Amp-hour law: that is, the ampere of the charging current should not exceed the ampere-hour of the battery to be charged. But in fact, it is the heat generated during the charging process and the gas evolution that limit the charging time of the battery. Therefore, in the mid-1960s, Joseph A. Mas put forward the famous charging The three laws, and a large number of experiments prove that if the battery maintains an equal and small amount of gas evolution during charging, then the charging current is an exponential curve. See figure 2 Best Charging Curve

[0020] The charging current i during charging is:

[0021] i = ...

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Abstract

The invention discloses a sectional type constant voltage and constant current charging method. The method comprises the following steps: determining an initial phase charging current I0 according to an optimal charging curve of a battery to obtain delta I; collecting an actual charging current Id and an actual charging voltage Ud of a storage battery in real time; judging the range of Id according to the detected actual charging current Id; outputting an charging current It of the current sectional constant current charging stage; judging the intensities of the current charging voltage Ud and the current charging current Id; and ending a charging process when the current charging voltage Ud is equal to a charge upper limit voltage U and the current charging current Id is equal to a minimum charging current Imin. The method forces the charging current to reduce exponentially in a sectional type mainly according to the optimal charging curve, thus achieving the purposes of shortening the charging time, reducing the water loss and gas evolution amounts of the storage battery, and prolonging the service life of the storage battery.

Description

technical field [0001] The invention relates to the technical field of electric vehicle charging, in particular to a segmented constant current and constant voltage charging method. Background technique [0002] Due to its low cost and mature technology, lead-acid batteries have become the most promising new green energy in the 21st century. However, the charging current and charging method during the charging process have a significant impact on the service life of the battery, especially the serious dehydration of the battery and the increase in gas evolution during the charging process are the main reasons for the battery to be scrapped. In the charging process of the battery, in order to maintain the equal amount of gas evolution, the optimal charging current is an exponential curve. Above the curve, it will cause the battery to lose water and increase the amount of gas evolution; below the curve, it will prolong the charging time of the battery. Therefore, it is neces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44
CPCY02E60/12H01M10/44H01M10/446Y02E60/10
Inventor 黄智宇蒲小华冯辉宗徐正龙陈波芮子乔
Owner 重庆工业赋能创新中心有限公司
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