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Method and device for analyzing and processing capacity drop of lithium cell energy storing system

An energy storage system, analysis and processing technology, applied in measurement devices, measurement of electrical variables, secondary battery repair/maintenance, etc., can solve problems such as the inability to quickly locate battery cells, and achieve the effect of rapid positioning

Active Publication Date: 2015-05-06
SHENZHEN CLOU ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a lithium battery energy storage system capacity drop analysis and processing method and analysis processing device, which solves the technical problem that the prior art cannot quickly locate the battery cell that causes capacity drop in the lithium battery energy storage system

Method used

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  • Method and device for analyzing and processing capacity drop of lithium cell energy storing system
  • Method and device for analyzing and processing capacity drop of lithium cell energy storing system
  • Method and device for analyzing and processing capacity drop of lithium cell energy storing system

Examples

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Embodiment 1

[0058] see figure 1 and figure 2 , figure 1 It is a schematic flow chart of Example 1 of the capacity drop analysis and processing method of the lithium battery energy storage system of the present invention; figure 2 It is a graph of Example 1 of the capacity drop analysis and processing method of the lithium battery energy storage system of the present invention.

[0059] In Embodiment 1, the present invention provides a method for analyzing and processing the capacity drop of a lithium battery energy storage system, which includes the following steps:

[0060] Step S10, recording the voltage value, temperature value and capacity value of each battery cell of the lithium battery energy storage system during operation, and storing the voltage value, temperature value and capacity value in the database.

[0061] The operation process of each battery cell in the lithium battery energy storage system includes the charging process and the discharging process.

[0062] Dur...

Embodiment 2

[0078] see image 3 , image 3 It is a flow chart of Embodiment 2 of the capacity drop analysis and processing method of the lithium battery energy storage system of the present invention.

[0079] In embodiment 2, the steps are basically the same as those in the above embodiment 1, the difference is that before the step S10, it also includes:

[0080] In step S20, the equalization function of the lithium battery energy storage system is turned on, so that after one battery cell in the lithium battery energy storage system reaches the cut-off voltage, the lithium battery energy storage system continues to charge or discharge.

[0081] Through the equalization function, the present invention achieves the technical effect of determining all the battery cells in the lithium battery energy storage system that cause the capacity of the lithium battery energy storage system to decrease at one time, and improves the capacity of the lithium battery energy storage system in the lithiu...

Embodiment 3

[0083] see Figure 4 , Figure 4 It is a flow chart of Embodiment 3 of the capacity drop analysis and processing method of the lithium battery energy storage system of the present invention.

[0084] In embodiment 3, the steps are basically the same as those in the above embodiment 1, except that the step S12 includes:

[0085] Step S30, comparing the voltage rising slopes of the voltage history curves of different battery cells in the same charging cycle or the voltage falling slopes of the voltage history curves in the same discharging cycle;

[0086] Compare the voltage rise slopes of the voltage history curves of different battery cells in the same charging cycle.

[0087] Alternatively, compare the voltage drop slopes of the voltage history curves of different battery cells in the same discharge cycle.

[0088] Step S31 , obtaining battery cells to be replaced whose voltage rising slopes or voltage falling slopes are different from those of the remaining battery cells....

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Abstract

The invention discloses a method for analyzing and processing the capacity drop of a lithium cell energy storing system. The method comprises the steps of recording voltage value, temperature value and capacity value of a running cell unit of the lithium cell energy storing system; storing the voltage value, temperature value and capacity value to a database; extracting the voltage value, temperature value and capacity value of each cell unit with the preset number in the same charging cycle and the same discharging cycle; generating a historical voltage curved line, a historical temperature curved line and a historical capacity curved line of each cell unit; comparing the historical voltage curved line, the historical temperature curved line or the historical capacity curved line of different cell units in the same charging cycle or the same discharging cycle; determining the cell unit which leads to system capacity drop. The invention further discloses an analyzing processing device. According to the method, the cell unit which leads to system capacity drop is determined according to the historical voltage curved line, the historical temperature curved line or the historical capacity curved line, and the technical effect of quickly positioning the cell unit to be replaced can be reached.

Description

technical field [0001] The invention belongs to the technical field of battery management, and in particular relates to a capacity drop analysis and processing method and an analysis and processing device of a lithium battery energy storage system. Background technique [0002] Since lithium battery energy storage systems are widely used in electric vehicles and other industries, there is a great market demand for lithium battery energy storage systems. [0003] However, the lithium battery energy storage system has the following problems: first: the actual capacity of each battery cell in the lithium battery energy storage system is uneven, which may easily lead to a decrease in the capacity of the lithium battery energy storage system; second: As the lithium battery energy storage system is used longer, the consumption of each battery cell in the lithium battery energy storage system is inconsistent, which will easily lead to a decrease in the capacity of the lithium batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/36H01M10/42Y02E60/10
Inventor 陈迪虎刘廉
Owner SHENZHEN CLOU ELECTRONICS
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