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Self adaptive fixed flow intermittent pulse limit time charging method

A charging method and technology of pulse charging, which are applied in the charging/discharging of secondary batteries, current collectors, electric vehicles, etc., can solve the problems of not switching to the floating charging stage, low charging efficiency, and backward batteries, etc. Increased life, charging efficiency, eliminating the effect of plate vulcanization

Inactive Publication Date: 2007-06-27
刘孝伟
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Problems solved by technology

[0008] The purpose of the present invention is to provide an adaptive constant current intermittent pulse time-limited charging method, which overcomes the low charging efficiency of the above three methods, the large water loss in summer, the charging does not switch to the float charging stage, and "thermal runaway" and deformation are prone to occur. , Insufficient charging in winter is likely to cause backward battery defects

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  • Self adaptive fixed flow intermittent pulse limit time charging method
  • Self adaptive fixed flow intermittent pulse limit time charging method
  • Self adaptive fixed flow intermittent pulse limit time charging method

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Embodiment Construction

[0022] FIG. 1 is a graph showing current and voltage changes in a common three-stage charging method. Taking 36V10Ah as an example, start charging with a current of about 1.8A to 43.2V (14.4 per battery), the current gradually decreases, and the voltage gradually rises to 44.1-44.5V, and when the current drops to 0.35-0.40A, switch to Float charging, constant voltage charging with a voltage of 41.4-42V until the charger is removed or the charging power supply is cut off, the charging time is mostly 8-12 hours.

[0023] Fig. 2 is a graph showing current and voltage changes in a common fixed-current-decreasing-current-pulse-charging method. Take 36V10Ah as an example, start to charge the battery pack with a current of about 1.8A, the voltage will gradually increase, and then start pulse charging at a fixed frequency when it reaches about 44V, and the amplitude of the pulse current will gradually decrease until the current decreases to 0.4 A or so, turn to low voltage constant v...

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Abstract

This invention discloses an adaptive constant current intermittent pulse time-limit charge method, which applies an alternation method of charge / stop to charge to eliminate ohm polarization and electrochemical polarization when stopping charging, and concentration polarization will be eliminated gradually, when polarization is eliminated, the end voltage of a cell will be reduced and charged again when reducing to a stipulated value and the charge efficiency will be increased greatly, the highest charge voltage is reduced automatically when the temperature of the cell rises.

Description

【Technical field】 [0001] The invention relates to the field of battery chargers, in particular to a charging method of the battery charger. 【Background technique】 [0002] When the battery is charging, its charging voltage will be higher than the actual voltage of the battery itself, and when discharging, the discharge voltage will be lower than the actual voltage of the battery itself. This phenomenon is called polarization. Polarization has the following three polarizations: 1. Ohmic polarization: caused by the resistance of each part of the battery connection, the voltage drop value follows Ohm's law, the current decreases, the polarization immediately decreases, and disappears immediately after the current stops. 2. Electrochemical polarization: Polarization is caused by the slowness of the electrochemical reaction on the electrode surface. Decreases significantly in the microsecond range as the current becomes smaller. 3. Concentration polarization: Due to the slownes...

Claims

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Application Information

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IPC IPC(8): H02J7/02H01M10/44
CPCY02E60/10
Inventor 刘孝伟
Owner 刘孝伟
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