Method and system for equalizing performance of battery pack

An equalization method and equalization system technology, applied in the field of electrochemical energy storage, can solve the problems of poor equalization reliability of low-voltage battery packs, and achieve the effects of improving capacity utilization, prolonging cycle life, and balancing reliability and performance

Active Publication Date: 2020-02-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a battery pack performance equalization method and system, which are used to solve the technical problem of poor reliability of low-voltage battery pack equalization due to the use of centralized or distributed methods in the existing battery pack performance equalization method

Method used

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  • Method and system for equalizing performance of battery pack
  • Method and system for equalizing performance of battery pack
  • Method and system for equalizing performance of battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A battery pack performance equalization method 100, such as figure 1 shown, including:

[0037]Step 110, synchronously collect the electrical information of each battery cell in the battery pack to be balanced to calculate the performance index of each battery module to be balanced, each battery module includes a plurality of adjacent battery cells, each adjacent two batteries Some battery cells overlap between the modules, and each battery cell is grouped;

[0038] Step 120: Based on the performance indicators of each battery module, determine the battery module whose index deviates the most from the threshold in each sub-battery group, and control other battery modules in the sub-battery group to charge the battery module or control the battery module Discharge to other battery modules, repeat step 110 until the performance in each sub-battery group is balanced, wherein each sub-battery group includes a plurality of adjacent battery modules with no overlap of battery...

Embodiment 2

[0065] A battery pack performance equalization system, comprising: a control processor and an equalizer corresponding to each sub-battery pack. The control processor is used for the battery pack to be balanced, and adopts any of the battery pack performance balancing methods described above to generate and control other battery modules in each sub-battery pack to charge the battery module with the largest index deviation threshold or control the index deviation threshold to be the largest. The control signal for discharging the battery module to other battery modules; one end of the equalizer corresponding to each sub-battery group is electrically connected to each battery module in the sub-battery group, and the other end is connected to the two ends of the sub-battery group. The other end is also communicatively connected with the control processor, and is used to realize balance control based on the control signal of the sub-battery group generated by the control processor. ...

Embodiment 3

[0071] A storage medium, where instructions are stored, and when a computer reads the instructions, the computer is made to execute any battery performance balancing method as described in Embodiment 1 above.

[0072] The relevant technical solutions are the same as those in Embodiment 1, and will not be repeated here.

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Abstract

The invention discloses a method and a system for equalizing the performance of a battery pack. The method comprises the steps of synchronously collecting electrical information of each single batteryin a battery pack to be equalized, and calculating to-be-equalized performance indexes of each battery module, wherein each battery module comprises multiple adjacent single batteries, part of the single batteries are overlapped between every two adjacent battery modules, and each single battery is grouped; and determining the battery module with the maximum index deviation threshold in each sub-battery pack based on performance indexes of each battery module, controlling other battery modules in the sub-battery pack to charge the battery module or controlling the battery module to dischargeto other battery modules, repeating the steps until the performance in each sub-battery pack is equalized, wherein each sub-battery pack comprises a plurality of adjacent battery modules without overlapping of single batteries, part of the single batteries are overlapped between every two adjacent sub-battery packs, and each battery module is grouped. According to the invention, staggered equalization is adopted, and performance equalization of the whole low-voltage battery pack can be efficiently and reliably achieved.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and more specifically relates to a method and system for balancing performance of a battery pack. Background technique [0002] The increasing shortage of traditional energy sources and the deteriorating environment have greatly promoted the development of new energy sources. Renewable energy generation represented by wind energy and solar energy is intermittent and volatile. to have a significant impact. Large-scale energy storage technology can effectively solve this problem. At the same time, it is of great significance for the "peak shaving and valley filling" of the power system, improving the safety and stability of the power system, and reducing the cost of power supply. In order to meet the voltage and capacity level requirements of large-scale energy storage systems, it is generally necessary to connect a large number of battery cells in series and parallel to work in group...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42
CPCH01M10/4207H01M10/425H01M2010/4271H02J7/0014Y02E60/10
Inventor 蔡涛魏芃韩云飞周敏
Owner HUAZHONG UNIV OF SCI & TECH
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