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.
CN107576918AActive Publication Date: 2018-01-12SHANGHAI ELECTRICGROUP CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI ELECTRICGROUP CORP
Publication Date
2018-01-12

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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.
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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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