Improved lithium battery pack equalizing method and equalizing circuit thereof

An equalization method and technology of lithium battery packs, which are applied in battery circuit devices, secondary battery charging/discharging, circuit devices, etc., can solve the problems of reduced reliability of equalization and unguaranteed accuracy.

Active Publication Date: 2014-03-12
STATE GRID CORP OF CHINA +3
View PDF7 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the capacity-based equalization method needs to accurately estimate the SOC of the single battery.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Improved lithium battery pack equalizing method and equalizing circuit thereof
  • Improved lithium battery pack equalizing method and equalizing circuit thereof
  • Improved lithium battery pack equalizing method and equalizing circuit thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] The features and advantages of the present invention will be described in detail through examples, but the protection scope of the present invention is not limited thereto.

[0036] An improved balancing method for a lithium battery pack, wherein the battery pack is composed of several single cells connected in series, comprising the steps of:

[0037] (1) For the battery pack for analysis, is the number of single cells in the battery pack, ,and is an integer;

[0038] (2) Collect and analyze data; measure and select the voltage vol at m historical moments, where m is an integer greater than or equal to 1, and calculate the state of charge SOC and state of health SOH at that moment, combined with the corresponding rated voltage of each single battery Capacity cap, equalization duration EquiT, equalization current EquiI, and then the original data matrix is ​​obtained as follows:

[0039]

[0040] (3) For the original data matrix Perform normalization proce...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides an improved lithium battery pack equalizing method and an equalizing circuit thereof. The method comprises the steps of performing clustering analysis on various data in one time period of each monomer battery of a battery pack by using a clustering analysis method, classifying the battery pack, judging the voltage of each battery in real time by combining and performing the equalizing method, performing further selection on each previously obtained classification by current information such as charging and discharging currents, finally obtaining the monomer battery needing to be equalized in the battery pack and performing equalizing and maintaining on the monomer battery by controlling an equalizing circuit. In the operation process of the battery pack, various feature data of the batteries can be analyzed, the monomer battery needing to be subjected to equalized charging and equalized discharging is picked out, and the monomer battery needing to be equalized is equalized by connecting the battery to the equalizing circuit; historical battery voltage data are introduced, the influence of the battery with abnormal voltage and the voltage collecting precision is effectively avoided, the condition of inconsistent voltage and capacitance is effectively avoided by combining surplus capacity relevant factors such as SOC and SOH, the consistency of the battery pack is effectively ensured and the service life of the battery pack is further ensured.

Description

technical field [0001] The invention relates to the field of equalization of battery packs, in particular to an improved equalization method of lithium battery packs and an equalization circuit thereof. Background technique [0002] Electric vehicles, energy storage power stations, electric bicycles, etc. all need to use battery packs composed of series-connected single cells to meet the needs of high voltage, so any effective use of battery packs has become a key issue at present. Although lithium-ion battery technology has made great progress in recent years, and the various performances of lithium batteries have been significantly improved; however, the inconsistency between single cells in lithium battery packs still exists widely. There are differences in various parameters of lithium batteries in the production process, and these differences are manifested as inconsistencies in the internal resistance, capacity, open circuit voltage, charge and discharge voltage platfo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H02J7/00H01M10/44
CPCY02E60/10
Inventor 吴哲陈荣柱赵深林世溪孙景钌王浩林厚飞张东林刘爱华郑民金建新林群吴为强赵建苏郑圣
Owner STATE GRID CORP OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap