Method and device for equalizing a battery pack

An equalization method and battery pack technology, applied to battery circuit devices, circuit devices, charge equalization circuits, etc., can solve the problems of inaccurate determination of opening results and inability to perform equalization for a long time

Active Publication Date: 2022-03-15
NEUSOFT REACH AUTOMOBILE TECH (SHENYANG) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above technical problems, this application provides a method and device for equalizing a battery pack, which does not need to meet the conditions for reaching the end of charge and discharge to determine the differences between battery cells, thereby avoiding the battery pack being unable to fully reach the end of charge and discharge. As a result, the result of determining the opening is inaccurate, which in turn causes the problem that the balance cannot be performed for a long time

Method used

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  • Method and device for equalizing a battery pack
  • Method and device for equalizing a battery pack
  • Method and device for equalizing a battery pack

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Embodiment Construction

[0057] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0058] In traditional methods, passive equalization is turned on at the end of charging or discharging. However, in practical applications, the battery pack will not completely reach the end of charge and discharge, resulting in inaccurate determination of the opening result, which in turn leads to the inability to perform equalization for a long time.

[0059] To...

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Abstract

The embodiment of the present application discloses a battery pack equalization method, which calculates the remaining power of each battery cell at the target time according to the OCV-SOC curve corresponding to the target time interval. time interval of moments. Using the battery cell with the smallest remaining power among the plurality of battery cells as the reference battery cell, the difference between the remaining power of each battery cell and the remaining power of the reference battery cell is calculated. If the difference between the remaining power of the target battery cell and the remaining power of the reference battery cell is greater than or equal to the first threshold, equalization is enabled. It can be seen that the remaining power of each battery cell at the target time is calculated according to the OCV-SOC curve, so as to accurately judge whether the battery cell needs to be balanced, without meeting the conditions for reaching the end of charging and discharging, and avoiding the battery pack that cannot fully reach the charging point. At the end of the discharge, it leads to the inaccurate determination of the opening result and the problem that equalization cannot be performed for a long time.

Description

technical field [0001] The invention relates to the field of battery management, in particular to a method and device for equalizing battery packs. Background technique [0002] During the use of many devices in daily life, such as the use of electric vehicles, battery packs are required to provide energy for them. A battery pack generally includes multiple battery cells, but the battery cells produced in the same batch have different performance parameters such as internal resistance, capacity, and self-discharge rate. The capacity difference between them will become more and more significant, seriously affecting the life of the battery pack. [0003] Therefore, in order to minimize the inconsistency among battery cells, it is necessary to balance the battery pack during charging and discharging, so as to reduce the capacity imbalance of the battery pack caused by the capacity difference of each battery cell. Passive equalization is a relatively common battery pack equali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
CPCH02J7/0014
Inventor 刘阳
Owner NEUSOFT REACH AUTOMOBILE TECH (SHENYANG) CO LTD
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