Charging method of power lithium ion battery by controlling polarizing voltage

A lithium-ion battery, polarized voltage technology, applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the problem of matching the original characteristics of the battery, improper selection of the turning point of constant current to constant voltage, and the impact of battery life. Large problems, etc., to achieve the effect of shortening the charging time, increasing the charging speed, and reducing the number of

Inactive Publication Date: 2010-08-25
HUIZHOU EPOWER ELECTRONICS +1
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Problems solved by technology

At this time, the battery is still charged according to the empirical charging curve, which cannot match the original characteristics of the battery, and has a great impact on the service life of the battery.
However, the CC-C

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  • Charging method of power lithium ion battery by controlling polarizing voltage
  • Charging method of power lithium ion battery by controlling polarizing voltage
  • Charging method of power lithium ion battery by controlling polarizing voltage

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In order to facilitate the understanding of those skilled in the art, the present invention will be further described in detail below in conjunction with embodiments.

In order to solve the above-mentioned problems, the technical solution adopted by the present invention is: a power lithium-ion battery polarization voltage control charging method, the steps of which are:

a. Obtain the maximum theoretical control value of polarization voltage V by calculation PCmax . The maximum polarization voltage is calculated using the following formula: V PCmax =V max -V OCV (SOC=100%), where V OCV (SOC=100%) represents the open circuit voltage value when the battery capacity is 100%. V max Indicates the maximum allowable charging voltage of various batteries, which varies according to the weight of the battery. For example, the maximum allowable charging voltage of lithium iron phosphate batteries is 3.6V, and that of lithium manganate batteries is 4.2V.

b. Keep the online calculated...

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Abstract

The invention relates to a charging method of a lithium ion battery, which belongs to the technical field of battery charging and can be used for computing the value change of the polarizing voltage of the battery by a calculation formula of the polarizing voltage of the battery, wherein the calculation formula is that UP=UO-UOCV-UR=UO-f(SOC)-I*Rd. The polarizing voltage is controlled to be within a certain numerical value range for ensuring that aberration produced on a charging voltage curve is invariant. The corresponding charging current of the battery in different SOC (State of Charge) and the same polarizing voltage during charging is automatically regulated so that the charging speed of the battery is controllable. On the premise of ensuring the service life of the battery, the charging method largely enhances the charging speed of the battery. Simultaneously, the charging time is shortened, thereby enhancing the utilization efficiency of the battery, reducing the quantity of standby battery packs in the replacement mode of the battery and providing conditions for the scale application of electric vehicles.

Description

technical field The invention relates to the technical field of battery charging, in particular to a charging method for a lithium ion battery. Background technique The traditional power lithium-ion battery charging methods include constant voltage and constant current charging, step-by-step lowering current charging, current limiting constant voltage charging, gradual step-down charging, gradually decreasing pulse charging, and fuzzy control charging, etc. These charging methods have deficiencies in use, and can only be compensated by selecting different charging methods according to different application occasions of the battery. For example, constant voltage and constant current charging, step-down current charging, constant voltage and current limiting charging, gradual step-down charging, and gradually decreasing pulse charging are all charging methods for lead-acid batteries. In fact, the current acceptance of power lithium-ion batteries The capacity is much better t...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCY02E60/12Y02E60/10
Inventor 冯大明刘飞阮旭松张维戈王占国文锋温家鹏
Owner HUIZHOU EPOWER ELECTRONICS
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