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Controllable battery module

A battery module and battery technology, applied in the direction of secondary battery repair/maintenance, etc., can solve the problems of battery short board effect, battery cell capacity and life loss, limiting the overall life of the battery system, etc., to improve life and reliability. Effect

Inactive Publication Date: 2015-01-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the current of each battery cell in the series circuit is equal, and the capacity of each battery cell has a certain difference, when charging, the battery with a smaller capacity is fully charged first, and continuing to charge may cause the battery with a smaller capacity to be overcharged; discharge When charging, the battery with the smaller capacity will be discharged first, and further discharge may cause the battery with the smaller capacity to be over-discharged.
As a result, the capacity and life of the battery cell with a small capacity are lost, and a vicious circle is formed
Therefore, the direct connection of wires inevitably leads to the occurrence of battery "short board effect", which seriously limits the overall life of the battery system

Method used

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Experimental program
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Effect test

Embodiment

[0017] This embodiment is a battery system suitable for a 690VAC energy storage system, with a rated voltage of 1100VDC, a rated capacity of 200Ah, and a rated current of 50A.

[0018] Such as figure 2 As shown, the battery system of this embodiment includes 23 controllable battery modules, and the 23 controllable battery modules are connected in series to form a battery stack (n=23), and the rated voltage of the battery stack is 1100VDC. In this embodiment, the battery system only includes one battery stack. according to figure 2 The way to connect constitutes the entire battery system.

[0019] in:

[0020] The battery string in the controllable battery module is composed of 15 lithium iron phosphate energy storage batteries with a rated voltage of 3.2V and a capacity of 200Ah in series, and its rated voltage is 48VDC.

[0021] The four controllable switches in the controllable battery module adopt power MOSFET IRF1312, its drain-source voltage is 80VDC, the...

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PUM

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Abstract

The invention discloses a controllable battery module. The controllable battery module comprises four controllable switches and a battery string which consists of energy storage battery monomers, wherein the four controllable switches are divided into two groups, and the two groups of controllable switches are connected in series respectively, and then are connected with the battery string in parallel; and the connecting points of the two groups of controllable switches which are connected in series are two leading-out line endpoints of the controllable battery module. By using the controllable battery module, different battery modules in a battery system can be controlled to be in different working states, the equilibrium operation and fault tolerance of the battery modules and mixed operation of the battery modules with different capacities are realized, and the service life and the reliability of the battery system are improved.

Description

technical field [0001] The present invention relates to a controllable battery module, in particular to a controllable battery module that can connect the battery forwardly or reversely into the loop or bypass the loop to control the charging and discharging of the battery, and is used for large-capacity Battery energy storage occasions. It belongs to the field of battery energy storage. Background technique [0002] The use of battery energy storage to smooth wind power and photovoltaic power generation is an effective way to solve the difficulty of new energy grid connection and the problem of "abandoning wind" of wind power. The application of large-scale battery energy storage in the power grid will change the history that electric energy can only be transmitted but not stored, will have a revolutionary impact on power production and operation, and will greatly promote the development of smart grids. [0003] Since the battery cell voltage is low (less than 5VDC), the ...

Claims

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Application Information

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IPC IPC(8): H01M10/42
CPCY02E60/10
Inventor 凌志斌
Owner SHANGHAI JIAO TONG UNIV
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