Power battery passive equalization control method and system

A power battery and passive equalization technology, which is applied in battery/fuel cell control devices, electric vehicles, electrical devices, etc., can solve problems such as power battery life attenuation, power battery overcharge and overdischarge, battery cell imbalance, etc.

Active Publication Date: 2016-10-26
CHONGQING CHANGAN AUTOMOBILE CO LTD
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Problems solved by technology

The power battery is composed of different numbers of battery cells in series. Since the battery cells are affected by factors such as ambient temperature and humidity during the manufacturing process, there are certain differences between the cells in the same power battery when they leave the factory. For example, there are differences in performance parameters such as power battery capacity, voltage, charge-discharge rate, etc., and these differences will follow the cycle of charging and discharging the power battery during the use of the new energy vehicle, and the working temperature environment of each unit inside the power battery. Influenced by different factors, it

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  • Power battery passive equalization control method and system
  • Power battery passive equalization control method and system
  • Power battery passive equalization control method and system

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Embodiment Construction

[0087] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0088] The embodiment of the invention discloses a passive balance control method and system for a power battery, so as to realize the balance control of each battery cell in the same power battery.

[0089] see figure 1 , a method flow chart of a passive balancing control method for a power battery disclosed in an embodiment of the present invention. The control method is applied to a battery management system and includes steps:

[0090] Step S11, judging w...

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Abstract

The invention discloses a power battery passive equalization control method and system. The power battery passive equalization control method comprises the steps that when the current power battery state parameter does not meet the power battery equalization enable function open condition, equalization control is not conducted on all single battery bodies in a power battery; and when the current power battery state parameter meets the power battery equalization enable function open condition, equalization control is conducted on the single battery bodies which meet the preset control condition, and equalization control is not conducted on the single battery bodies which do not meet the preset control condition. Therefore, equalization control over all the single battery bodies in the same power battery is achieved through the power battery passive equalization control method and system, so that over-charging and over-discharging risks during full charging and full discharging of the power battery are effectively avoided, and the service life of the power battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of battery management systems for new energy vehicles, and more specifically, to a passive equalization control method and system for power batteries. Background technique [0002] With the increasingly prominent issues of energy and environmental protection, new energy vehicles have become the development direction of the future automobile industry. As the auxiliary or main power source of new energy vehicles, the performance of power batteries directly affects the performance of new energy vehicles. The power battery is composed of different numbers of battery cells in series. Since the battery cells are affected by factors such as ambient temperature and humidity during the manufacturing process, there are certain differences between the cells in the same power battery when they leave the factory. For example, there are differences in performance parameters such as power battery capacity, voltage, charge...

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Application Information

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IPC IPC(8): B60L11/18B60L3/00
CPCB60L3/0046B60L58/22Y02T10/70
Inventor 张后亮杨辉前李连兴姚振辉贺刚周安健
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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