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Method for detecting internal resistance of storage battery in energy storage system on line

A battery pack and energy storage system technology, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., to achieve high reliability

Inactive Publication Date: 2012-11-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The need for specialized AC signal injection equipment is also one of the inherent disadvantages of this method

Method used

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  • Method for detecting internal resistance of storage battery in energy storage system on line
  • Method for detecting internal resistance of storage battery in energy storage system on line
  • Method for detecting internal resistance of storage battery in energy storage system on line

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Embodiment Construction

[0029] The embodiments of the present invention are described in detail below: the present embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation and specific operation process are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0030] This embodiment adopts the following steps to realize:

[0031] 1. Charge and discharge control

[0032] In a specific implementation, according to figure 1 The schematic diagram shown constitutes the system, and the corresponding voltage and current measurement circuits can be installed at the positions marked with voltage and current in the figure.

[0033] Multi-frequency charge and discharge control can be realized by using a general-purpose energy storage system converter, and its overall equivalent circuit structure is shown in the attached figure 1 shown.

[0034] In the figure, R1 is the sum of th...

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Abstract

The invention discloses a method for detecting internal resistance of a storage battery in an energy storage system on line. The method comprises the following steps of: performing multi-frequency current charging and discharging control; acquiring voltage and current signals; and realizing online detection of the internal resistance of the storage battery through data processing, wherein according to the method, voltage harmonics and current harmonics at different frequencies which are generated by a converter serve as the detection signals in operation. An extra device is not required during charging and discharging control of the storage battery; the capacity and performance of the storage battery are not influenced; the method is different from other measurement methods in which the storage battery is measured only in a static state; the measurement result reflects the comprehensive conditions of the internal resistance of the storage battery in operation; and the result has high credibility.

Description

technical field [0001] The invention relates to a method for detecting the internal resistance of a battery pack, which can be applied to occasions where a battery energy storage system needs to detect the internal resistance of the battery pack, and belongs to the field of battery energy storage. Background technique [0002] At present, battery energy storage is a key common technology to solve new energy access, power grid peak-shaving and valley filling, micro-grid and electric vehicle applications. The performance of the battery is the key to the reliable operation of the energy storage system. It is one of the best schemes currently recognized to judge the battery performance by the internal resistance detection method. The internal resistance detection facilitates the staff to do the maintenance and replacement of the battery as soon as possible to ensure the safe and reliable operation of the equipment. Therefore, the monitoring of battery internal resistance has i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08
Inventor 凌志斌
Owner SHANGHAI JIAO TONG UNIV
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