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Constant power charging system and method of lithium battery pack

A technology of constant power charging and lithium battery pack, which is applied in battery circuit devices, current collectors, electric vehicles, etc., can solve the problems of long charging time, unsuitable for fast charging of large-capacity batteries, and short time for the maximum power of the charger. Achieve the effect of improving charging efficiency, saving charging time and prolonging life.

Inactive Publication Date: 2011-01-12
APOWER ELECTRONICS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the maximum output power of the charger is given, the maximum power of the charger appears for a short time. Since the charger does not use the maximum output power in most of the time, the charging time is long, which is not suitable for fast charging of large-capacity batteries.

Method used

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  • Constant power charging system and method of lithium battery pack
  • Constant power charging system and method of lithium battery pack
  • Constant power charging system and method of lithium battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The large battery pack 5 consists of 96 lithium batteries connected in series, each cell has a capacity of 100Ah and a nominal voltage of 355V for charging the lithium manganate battery pack. The initial voltage of the large battery pack 5 is

[0057]

[0058] The charge termination voltage is

[0059]

[0060] According to the characteristics of the lithium iron manganate battery, at a charging rate of 0.2C, using the conventional constant current and constant voltage charging method, the ratio R of the battery capacity charged in the constant current charging stage to the total battery capacity is about 85%.

[0061] (1) In the constant current and constant voltage charging mode, the output parameters of the charger are 403V and 20A, and the maximum power of the charger = , then the time required for the constant current phase is

[0062]

[0063] The constant current charging process takes 4.25 hours. According to the characteristics of the lithium...

Embodiment 2

[0071] The large battery pack 5 is charged by a lithium iron phosphate battery pack with a capacity of 100Ah and a nominal voltage of 360V with 120 batteries connected in series. The initial voltage of the large battery pack 5 is

[0072]

[0073] The charge termination voltage is

[0074]

[0075] According to the characteristics of the lithium iron manganate battery, at a charging rate of 0.2C, using the conventional constant current and constant voltage charging method, the ratio R of the battery capacity charged in the constant current charging stage to the total battery capacity is about 90%.

[0076] (1) In the constant current and constant voltage charging mode, the output parameters of the charger are 444V and 20A, and the maximum power of the charger = , then the time required for the constant current phase is

[0077]

[0078] The constant current charging process takes 4.5 hours. According to the characteristics of the lithium iron phosphate batte...

Embodiment 3

[0086] The large battery pack 5 consists of 120 cells connected in series, each cell has a capacity of 100Ah, and a nominal voltage of 360V is charged by a lithium iron phosphate battery pack. The initial voltage of the battery pack is

[0087]

[0088] The charge termination voltage is

[0089]

[0090] According to the characteristics of the lithium iron manganate battery, at a charging rate of 1C, the conventional constant current and constant voltage charging method is adopted, and the ratio R of the battery capacity charged in the constant current charging stage to the total battery capacity is about 70%.

[0091] (1) In the constant current and constant voltage charging mode, the output parameters of the charger are 444V and 100A, and the maximum power of the charger = , then the time required for the constant current phase is

[0092]

[0093] The constant current charging process takes 42 minutes. According to the characteristics of the lithium iron ...

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Abstract

The invention relates to a constant power charging system and a method of a lithium battery pack. A main controller is communicated with a sub-controller through a CAN bus, and after the sub-controller receives a command, a control voltage measuring module measures the voltage; a voltage detecting module transmits the detected voltage of a small battery pack to the sub-controller through a photoelectric isolation circuit, and the sub-controller transmits the information to the main controller; the main controller judges whether the voltage value is in the specified range or not according to the received measured total voltage V, wherein if the voltage value is in the specified range, the circulation continues, and if the voltage value is not in the specified range, the circulation stops; the main controller acquires the theoretical charging voltage by summing the total voltage V and the voltage loss delta V in a charging line; the main controller judges whether the Vtrue is less than the maximum charging voltage of a charger or not, wherein if the Vtrue is less than the maximum charging voltage, the circulation continues, and if the Vtrue is not less than the maximum charging voltage, the circulation stops; the main controller acquires the theoretical current value by dividing the theoretical charging voltage Vtrue by the maximum power of the charger; and the main controller transmits the Vtrue and the Vture to the charger through the CAN bus, and the charger charges a large battery pack according to the received voltage and current.

Description

technical field [0001] The invention relates to the technical field of charging management, in particular to a fast charging method for a large-capacity power lithium battery pack and the realization of a charging management system. Background technique [0002] Since the invention of the lithium battery, it has unique advantages such as high energy density, high working voltage, low self-discharge rate, long cycle life, and no pollution. It is understandable that it has become the first choice for electric vehicle power batteries. On the one hand, in order to ensure the battery life of electric vehicles, the capacity of lithium batteries is made as large as possible; on the other hand, how to quickly, stably and safely charge large-capacity lithium batteries, especially the entire battery pack, has become an urgent problem to be solved. At present, for charging lithium batteries on the market, constant voltage charging, constant current charging or both charging methods are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 袁昌杰王自鑫陈瑞祥李佳明
Owner APOWER ELECTRONICS CO LTD
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