A method and system for balancing battery packs

A battery pack and equalization technology, applied in battery circuit devices, current collectors, electric vehicles, etc., can solve the problems of increasing the volume of the equalization system, high cost, and difficulty in implementation.

Active Publication Date: 2016-02-10
HONG KONG PRODUCTIVITY COUNCIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the problems of long discharge equalization time and heat dissipation, there are other discharge equalization methods in the prior art, which use fans, super capacitors or other energy storage and energy conversion devices to replace power resistors or connect them in parallel at both ends of power resistors to increase the equalization current As well as improving heat dissipation, although this method is cleverly designed, it will greatly increase the volume of the balanced system
[0005] Active equalization saves energy, can increase battery life, and equalizes faster, but it costs more and is more difficult to implement
There is an active equalization device in the prior art, in which each battery cell of the battery pack is equipped with a DC-DC power supply. Although it can quickly balance the large-capacity lithium-ion battery, the cost is very high, and the equalization device very bulky
There is also another active equalization device in the prior art. In this device, a polarity switch group and a battery selection switch group are used to enable an isolated converter to perform equalization management on multiple batteries, thereby reducing the number of charging and discharging devices and the number of circuits. complexity, but because a charging and discharging device can only balance one of the multiple batteries at the same time, the balancing time is longer
There is also a balancing device in the prior art. In this device, energy storage inductors are used to transfer energy in the battery pack, but this device can only transfer energy to adjacent battery cells. If two batteries that need to be balanced When the cells are far apart, the equalization time will become longer, and there will be energy loss when charging and discharging the inductor at the same time, and the energy loss will be greater when the distance between the cells to be balanced is far away
[0006] In summary, active equalization and discharge equalization have their own disadvantages

Method used

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  • A method and system for balancing battery packs
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  • A method and system for balancing battery packs

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Embodiment Construction

[0038] In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details. In other examples, some technical features known in the art are not described in order to avoid confusion with the present invention.

[0039] In order to provide a thorough understanding of the present invention, the detailed structure will be set forth in the following description. It is evident that the practice of the invention is not limited to specific details familiar to those skilled in the art. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments besides these detailed descriptions.

[0040] In one aspect, the invention provides a method for balancing a battery pack. figure 1 A flowchart of a method 100 ...

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PUM

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Abstract

The invention discloses a method and a system for balancing a battery pack. The method includes determining a balancing way which is selected according to consistency of batteries of the battery pack, determining that the battery pack does not work, and utilizing the determined balancing way to balance the battery pack. The method and the system for balancing the battery pack select the balancing way according to the characteristics of the batteries, so that better balance can be made between system cost reducing and energy saving; and balance management among battery monomers of the battery pack can be achieved under the condition that usage of users is not influenced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method and system for balancing battery packs. Background technique [0002] Today, as environmental and energy issues are becoming more and more prominent, electric energy is becoming more and more popular because of its green and environmental protection characteristics. Batteries capable of storing electrical energy have begun to be used in fields such as electrical tools and electric vehicles. Although this new energy electric vehicle can solve the problems of energy crisis and environmental crisis, it also has a development bottleneck - the battery. The power battery pack applied to electric vehicles will cause inconsistencies between battery cells due to the differences in the manufacturing and use processes. When the battery pack is charging, the monomer with a high state of charge (SOC) will reach the cut-off voltage first, thereby reducing the amount of electricity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
Inventor 陈金舟陈梦马海波岑雅贤李显达
Owner HONG KONG PRODUCTIVITY COUNCIL
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