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A battery pack performance equalization method and system

A balancing method and technology of battery packs, applied in the field of electrochemical energy storage, can solve problems such as poor balance reliability of low-voltage battery packs, and achieve the effects of improving capacity utilization, solving inconsistent state of charge, and prolonging cycle life.

Active Publication Date: 2021-08-03
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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  • A battery pack performance equalization method and system
  • A battery pack performance equalization method and system
  • A battery pack performance equalization method and system

Examples

Experimental program
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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 battery pack performance equalization method and system. The method includes: synchronously collecting the electrical information of each battery cell in the battery pack to be balanced, and calculating the performance index of each battery module to be balanced. Each battery module includes adjacent Multi-cell battery cells, some battery cells overlap between every two adjacent battery modules, and each battery cell is grouped; based on the performance indicators of each battery module, determine the deviation of the indicators in each sub-battery group The battery module with the largest threshold, and control other battery modules in the sub-battery group to charge the battery module or control the battery module to discharge to other battery modules. Repeat the above until the performance of each sub-battery group is balanced. Each sub-battery group includes a plurality of adjacent battery modules with no overlap of battery cells, each of two adjacent sub-battery groups has a part of battery cells overlapped, and each battery module is grouped. The invention adopts interleaved equalization, which can efficiently and reliably achieve the performance equalization of the entire low-voltage battery pack.

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 Patents(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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