Passive equalization control system and control method used for maintaining consistency of battery pack

A passive balancing and control system technology, applied in electric vehicles, battery circuit devices, current collectors, etc., can solve problems such as damage to single cells, unbalanced charging and discharging of lithium battery packs, etc., to ensure work safety and maintain system consistency sexual effect

Active Publication Date: 2014-03-19
SHANGHAI AEROSPACE POWER TECH
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Problems solved by technology

However, the life of the battery after grouping is far lower than that of the single battery, mainly due to the difference in the manufacturing process of the single battery, the difference in self-discharge, the density of the e

Method used

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  • Passive equalization control system and control method used for maintaining consistency of battery pack
  • Passive equalization control system and control method used for maintaining consistency of battery pack
  • Passive equalization control system and control method used for maintaining consistency of battery pack

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Embodiment Construction

[0030] Specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0031] The invention discloses a passive equalization control system for maintaining consistency of battery packs. The system includes: a battery management system, a plurality of equalization resistors corresponding to battery cells one by one, and equalization switches corresponding to each equalization resistance one by one.

[0032] The battery management system (BMS) circuit is connected to the battery pack, monitors the capacity of each battery cell in the battery pack in real time, and judges whether there is a significant capacity difference among the battery cells in the battery pack.

[0033] Several balancing resistors are respectively connected in parallel with each battery cell in the battery pack, and are used to consume the power of the corresponding battery cell during passive balancing control.

[0034] Each equalizing resistor ...

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Abstract

The invention discloses a passive equalization control system used for maintaining consistency of a battery pack. The system comprises a battery management system which is connected with the battery pack through a circuit to monitor capacity of each battery monomer in the battery pack in real time and is used for judging whether an obvious capacity difference exists or not; multiple equalization resistors which are connected in parallel with each battery monomer in the battery pack respectively, wherein each equalization resistor is connected in series with a normally open equalization switch; the battery management system is connected to each equalization switch respectively to control an on/off state of each equalization switch; when the difference between the capacity of one battery monomer and the capacities of other battery monomers is too great, the connected equalization switches are switched off to consume the electric quantity of the battery monomer. According to the invention, the electric quantity of the battery monomer with too high capacity is consumed by detecting the voltage of battery monomers in the battery pack and judging whether the difference between the capacity of the battery monomer and the capacities of the other battery monomers is too great, so that passive equalization control is realized, and system consistency of the battery pack is maintained.

Description

technical field [0001] The invention relates to lithium batteries and system manufacturing technologies in the vehicle-mounted and energy storage fields, and in particular to a passive equalization control system and control method for maintaining consistency of battery packs. Background technique [0002] The power lithium battery pack system is gradually being applied in fields such as electric vehicles and large energy storage systems. However, the life of the battery after grouping is far lower than that of the single battery, mainly due to the difference in the manufacturing process of the single battery, the difference in self-discharge, the density of the electrolyte, and the temperature and ventilation conditions of the battery after grouping. Unbalanced charging and discharging of lithium battery pack. This further led to the damage of some single cells and entered a vicious cycle. Therefore, the equalization technology plays a key role in improving the capacity o...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 叶磊宋苏刘永星那伟蒋新华
Owner SHANGHAI AEROSPACE POWER TECH
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