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Method for realizing dynamic voltage balancing of battery pack in charging state by PWM shunting

A state of charge, storage battery pack technology, applied in the direction of secondary battery charging/discharging, battery circuit devices, electric vehicles, etc., can solve the problems of inconvenient large-capacity battery packs, too small power consumption, and unobvious equalization effect

Inactive Publication Date: 2009-12-09
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to determine the resistance value of the bypass resistor in this method. If it is too large, the equalization effect will not be obvious, and if it is too small, the power consumption will be large, which is not convenient for application in large-capacity battery packs.

Method used

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  • Method for realizing dynamic voltage balancing of battery pack in charging state by PWM shunting
  • Method for realizing dynamic voltage balancing of battery pack in charging state by PWM shunting
  • Method for realizing dynamic voltage balancing of battery pack in charging state by PWM shunting

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Embodiment Construction

[0028] see figure 2 , image 3 In this embodiment, the PWM shunt method realizes the dynamic voltage equalization method under the charging state of the battery pack. The method is to install a test unit at both ends of each battery E1, E2...En-1 and En of the battery pack in series, and the test unit has a built-in shunt branch. , the shunt branch is composed of a switch tube S and a shunt resistor R connected in series, and the switch tube S is provided with a switch control signal by the PWM control circuit; the control mode of the PWM control circuit is:

[0029] In the charging state of the battery pack, the monitoring unit calls each test unit through the 485 bus to obtain the terminal voltage of each single battery, and through comparison, an independent PWM shunt control is performed on the single battery that is 1% higher than the average voltage of all batteries.

[0030] In the specific implementation, the PWM shunt control is to send the PWM duty cycle correspond...

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Abstract

The invention relates to a method for realizing dynamic voltage balancing of a battery pack in a charging state by PWM shunting, which is characterized in that two ends of each battery in a serial battery pack are provided with a testing unit respectively; the inside of the testing unit is provided with a shunting branch circuit which consists of a switch tube and a shunting resistor in series; a switch control signal is provided for the switch tube by a PWM control circuit; a controlling mode of the PWM control circuit comprises that: in the charging state of the battery pack, a monitoring unit calls up each testing unit through a 485 bus to obtain terminal voltage of each single battery; and through comparison, the single battery which is higher than 1 percent of the average voltage of all the batteries is subjected to independent PWM shunting control. The method is used for realizing the real-time active regulation of the charging voltage of each single battery to allow the charging voltage of each single battery to be consistent.

Description

technical field [0001] The invention relates to a charging method for a battery pack, more specifically a charging method for a battery pack used in a power supply system using a battery pack as a backup power source and a power source. Background technique [0002] The power supply system using battery packs as backup power is widely used in important occasions related to international people's livelihood such as power systems and communication base stations. At the same time, battery packs also play a huge role in electric vehicles and other aspects. The cost of the storage battery often occupies a large proportion in the complete set of equipment, so the maintenance of the storage battery becomes a very important issue. [0003] Inconsistencies in cells in a battery pack are unavoidable. The inconsistency of the battery refers to the differences in the parameters such as voltage, internal resistance and capacity of the same model and specification of the battery. There...

Claims

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Application Information

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IPC IPC(8): H02J7/04H01M10/44
CPCY02E60/12Y02E60/10
Inventor 黄海宏杜少武王海欣庄翔
Owner HEFEI UNIV OF TECH
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