Battery pack balancing method and device

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

Active Publication Date: 2019-11-19
NEUSOFT REACH AUTOMOBILE TECH (SHENYANG) CO LTD
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  • Abstract
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  • Claims
  • Application Information

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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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  • Battery pack balancing method and device
  • Battery pack balancing method and device
  • Battery pack balancing method and device

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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 embodiments of the invention disclose a battery pack balancing method. According to the method, the residual electric quantity of each battery cell at a target time point is calculated according to an OCV-SOC curve corresponding to a target time interval, wherein the target time interval is a time interval between the current electrifying starting time point and the last electrifying ending time point; with the battery cell in the plurality of battery cells which has the minimum residual electricity quantity is used as a reference battery cell, the difference value of the residual electricity quantity of each battery cell and the residual electricity quantity of the reference battery cell is calculated; and if the difference value of the residual electric quantity of a target battery cell and the residual electric quantity of the reference battery cell is larger than or equal to a first threshold value, balance is started. Thus, the residual electric quantity of each battery cell at the target time point is calculated according to the OCV-SOC curve, so that whether the battery cells need to be balanced or not is judged accurately; charging and discharging tail end conditions are not required to be met; the problem that a battery pack cannot be balanced for a long time due to the inaccuracy of a starting result because that the battery pack cannot completely reach charging and discharging tail ends is solved.

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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IPC IPC(8): H02J7/00
CPCH02J7/0014
Inventor 刘阳
Owner NEUSOFT REACH AUTOMOBILE TECH (SHENYANG) CO LTD
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