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Quick charging method for lead-acid storage battery of electric vehicle

A lead-acid battery, fast charging technology, applied in electric vehicle charging technology, secondary battery charging/discharging, electric vehicles and other directions, can solve the problem of fast charging, etc., to improve charging efficiency, single function, improve discharge pulse The effect of frequency

Active Publication Date: 2020-05-15
贵州省机电研究设计院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristic is to charge the over-discharged battery with a small current, and charge it with a negative pulse constant current of 0.2c-0.3c until it enters the constant voltage charge in the later stage. Due to the small charging current, it takes 4 to 5 hours to fully charge the battery, so it is actually counted. Can't really fast charge

Method used

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  • Quick charging method for lead-acid storage battery of electric vehicle
  • Quick charging method for lead-acid storage battery of electric vehicle
  • Quick charging method for lead-acid storage battery of electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1. The fast charging method for the lead-acid battery of electric vehicles, when charging the lead-acid battery, the high-power constant-voltage current-limiting charging module and the low-power pulse discharge module work at the same time, that is, the constant-voltage current-limiting mode charging is superimposed with an adjustable depth negative pulse to charge the battery Charge.

[0031] The specific parameters of the high-power constant voltage and current-limiting charging module and the low-power pulse discharging module are as follows:

[0032] High power constant voltage current limiting charging module charging current I C : 1C-3C ampere, where C is the rated capacity of the battery;

[0033] The maximum charging voltage of the high-power constant-voltage and current-limiting charging module is: U1=(battery rated voltage / 2)*(2.5-2.7)V;

[0034] Negative pulse conversion voltage when the low-power pulse discharge module is charging: U2=(battery ra...

Embodiment 2

[0046] Example 2. The fast charging method for the lead-acid battery of electric vehicles, when charging the lead-acid battery, the high-power constant-voltage current-limiting charging module and the low-power pulse discharge module work at the same time, that is, the constant-voltage current-limiting mode charging is superimposed with an adjustable depth negative pulse to charge the battery Charge.

[0047] In the foregoing rapid charging method for lead-acid batteries of electric vehicles, the specific parameters of the high-power constant voltage and current-limiting charging module and the low-power pulse discharging module are as follows:

[0048] The charging current I of the high-power constant voltage and current limiting charging module C : 2C ampere, where C is the rated capacity of the battery;

[0049] The highest charging voltage of the high-power constant-voltage and current-limiting charging module is: U1=(battery rated voltage / 2)*2.6V;

[0050] Negative pul...

Embodiment 3

[0053] Example 3. For 12v 12ah electric vehicle lead-acid battery fast charging process is as follows:

[0054] First, input the battery rated voltage 12v, rated capacity 12ah into the controller, first select the charging time 45 minutes, the controller calculates the charging current I C =1.5C=1.5x12=18A, the initial discharge duty pulse is automatically selected as 1%, which can be modified, and the modification range is 1%-3%, and the discharge pulse frequency is automatically selected as 20hz, which can be modified, and the modification range is 5hz-500hz , size: I F =IC / 2=30A / 2=15A, U1 and U2 can be calculated at the same time, where U2=(12v / 2v)*2.4v=14.4v; U1=(12v / 2v)*2.6v=15.6v.

[0055] Start charging, and when the fast charger detects that the battery voltage is less than 14.4v, the high-power constant-voltage and current-limiting charging module of the charger will charge the battery with a constant current of 18A. % of the discharge pulse with a real current dep...

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Abstract

A quick charging method for a lead-acid storage battery of an electric vehicle is characterized in that when the lead-acid storage battery is charged, a high-power constant-voltage current-limiting charging module and a low-power pulse discharging module work at the same time, that is, the storage battery is charged in a constant-voltage current-limiting charging mode and superimposed with negative pulses with adjustable depth. According to the method, the lead-acid storage battery of the electric vehicle is rapidly charged for 45 minutes, the actual capacity is 85% or above of the rated capacity, the purpose of emergency charging is achieved, water loss is less when the storage battery is charged, and the influence on the service life of the storage battery is less.

Description

technical field [0001] The invention relates to the field of chargers for lead-acid storage batteries of electric vehicles, in particular to a fast charging method for lead-acid storage batteries of electric vehicles. Background technique [0002] Lead-acid batteries have been invented for more than 100 years. Because of their low price and wide range of uses, they are also widely used in electric vehicles. The conventional charging of lead-acid batteries for electric vehicles generally uses low current and long-term charging to charge the batteries. The purpose of charging is to reduce the cost of the charger and prolong the life of the battery. The charging time generally takes more than 10 hours, which is suitable for charging in ordinary occasions. In some special cases, such as time is urgent, it needs to be charged as soon as possible. Generally, for lead-acid batteries, the charging time is less than 5 hours, which is considered fast charging, but from the current poi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44B60L53/00
CPCH01M10/44B60L53/00Y02T10/70Y02T10/92Y02T10/7072Y02T90/14Y02E60/10
Inventor 杨洪涛李志强汪菲甘蜜夏先春
Owner 贵州省机电研究设计院
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