Remaining capacity estimation method and system of lithium battery

A technology of remaining power and lithium battery, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., and can solve the problems of low SOC estimation accuracy when online in real time.

Active Publication Date: 2018-01-12
SHANGHAI ELECTRICGROUP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect of low SOC estimation accuracy in real-time online lithium batteries for energy storage in the prior art, and to provide a method that can still correct the ampere-hour integration method for a long time when the lithium battery is in the charging and discharging state. A method and system for estimating the remaining power of a lithium battery that can improve the SOC estimation accuracy of a lithium battery for energy storage when the cumulative error caused by the calculation is online in real time

Method used

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  • Remaining capacity estimation method and system of lithium battery
  • Remaining capacity estimation method and system of lithium battery
  • Remaining capacity estimation method and system of lithium battery

Examples

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Embodiment 1

[0088] Such as figure 1 As shown, a method for estimating the remaining power of a lithium battery comprises the following steps:

[0089] Step 100, set the first cycle number n=0, set the second cycle number k=0, and the current SOC value is expressed as SOC n , SOC n The SOC value of the previous calculation cycle is denoted as SOC n-1 , n and k are both natural numbers; obtain the working parameters of the lithium battery, including the lithium battery’s static time T, current I and terminal voltage V; set the initial parameters of the lithium battery, specifically including setting the rated capacity C of the lithium battery N , SOC calculation cycle t, first threshold T 0 , the second threshold T 1 , the third threshold and set the SOC p , where SOC p It is the SOC value of the extreme point corresponding to the peak or trough of the rechargeable capacity change rate of the lithium battery. The so-called rechargeable capacity change rate is ΔSOC / ΔV, where ΔSOC / ΔV is...

Embodiment 2

[0107] Such as figure 2 As shown, an estimation system for the remaining power of a lithium battery includes a setting module 1, a mode judgment module 2, an extreme value judgment module 3, a first calculation module 4, a second calculation module 5, a third calculation module 6, and a fourth calculation module. Calculation module 7 , fifth calculation module 8 , first time judging module 9 , second time judging module 10 , output module 11 and loop execution module 12 . The second calculation module 5 includes a sixth calculation module 501 , a correction judgment module 502 and a seventh calculation module 503 .

[0108] The setting module 1 is used to set the first number of cycles n=0 before calling the mode judgment module 2, set the second number of cycles k=0, and the value of the current SOC is represented as SOC n , SOC n The SOC value of the previous calculation cycle is denoted as SOC n-1 , n and k are both natural numbers; the setting module 1 is also used to ...

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Abstract

The invention discloses a remaining capacity estimation method and system of a lithium battery. The method comprises the following steps that S1, the working mode of the lithium battery is regularly judged, if the working mode is a charging mode, the step S21 is carried out, and if the working mode is a discharging mode, the step S22 is carried out; S21, whether or not the chargeable capacity change rate of the lithium battery reaches a wave crest or a wave trough is judged, if yes, the step S3 is carried out, and if not, the step S22 is carried out; S22, the current SOC value is calculated bymeans of the ampere-hour integral method, and the step S4 is carried out; S3, the current SOC value is calculated by means of the ampere-hour integral method, and SOCp is used for rectifying the current SOC value, wherein the SOCp is the SOC value of the corresponding extreme point when the chargeable capacity change rate of the lithium battery reaches the wave crest or the wave trough; S4, the current SOC value is output. The method is easy and practicable, the calculation amount is small, and on the premise that the current hardware condition is not improved, the estimation precision of theSOC can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of battery management of lithium batteries for energy storage, in particular to a method and system for estimating the remaining power of lithium batteries. Background technique [0002] BMS (Battery Management System, battery management system), as the key equipment in the energy storage system, can effectively avoid the impact of battery overcharge, overdischarge, overtemperature, group inconsistency and other problems on the safety and service life of the battery. Give full play to the energy storage performance of lithium batteries and reduce the operating costs of energy storage. SOC (State of Charge, State of Charge), which is a characterization of the battery's remaining power, is an important parameter of the control strategy of the battery management system. It provides a judgment standard for the entire control strategy and will directly affect the working performance of the battery. Accurate esti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 许伟陈蓓李劲鲍立成李杨
Owner SHANGHAI ELECTRICGROUP CORP
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