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Single-phase inverter discharging control circuit based on adjustable battery pack series structure and control method thereof

A single-phase inverter and discharge control technology, applied in battery circuit devices, safety/protection battery circuits, charge equalization circuits, etc., can solve the problems of unsatisfactory practical application effects, large hardware volume, and high application costs

Pending Publication Date: 2018-10-12
李勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Both the current passive equalization and active equalization technologies have problems such as low efficiency and unsatisfactory practical application effects.
Especially the active equalization technology, including the capacitor fit method and the voltage conversion method, has defects such as extremely complex circuits, large hardware volume, and high application costs.

Method used

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  • Single-phase inverter discharging control circuit based on adjustable battery pack series structure and control method thereof

Examples

Experimental program
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Effect test

Embodiment Construction

[0028] Each single battery (or single battery pack) in the battery pack is controlled on and off through field effect transistors, relays or other switching devices, so that the single battery (or single battery pack) can be connected in series to the bus, or the single The bulk battery (or single battery pack) is bypassed out of the series combination.

[0029] The negative pole of the single battery (or single battery pack) is directly connected to the series busbar, and the positive pole is connected to the series busbar through the Sx_1 (first switching element) switch. The switch of Sx_1 is turned on, and the switch of Sx_2 (the second switching element) is turned off, then the single cells (or single battery packs) of this stage are connected in series to the bus bar to participate in the discharge. The Sx_1 switch is turned off, and the Sx_2 switch is turned on, so the single battery (or single battery pack) of this stage is bypassed to form a series combination, and no...

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Abstract

The invention discloses an adjustable battery pack series structure provided with a single-phase inverter discharging control circuit with a battery protection and active equalization function. The circuit design can perform discharging control on each single battery (or single battery pack) via a breakover path for controlling a current, and single-phase inverter discharging can be achieved via OWM switch modulation. The circuit design can achieve the active equalization capacity having the same size of the discharging current. Via dynamic control, each single battery (or single battery pack)in the battery pack can be fully discharged.

Description

technical field [0001] The invention relates to the field of batteries. Background technique [0002] The rapid development of new energy technologies, especially the widespread application of lithium batteries in backup energy storage and electric vehicles, puts forward higher requirements for key battery energy storage and battery management technologies, and it is necessary to improve the effectiveness and balance of battery pack discharge , so that the energy storage characteristics of the battery pack can be maximized. [0003] In the application of the battery pack, in addition to the battery management system, an inverter circuit needs to be added to realize the inverter discharge. The system architecture is complex and the hardware cost is high. [0004] The battery pack technology has high requirements on the consistency of single cells, otherwise the battery consistency will seriously affect the overall performance of the battery pack. However, due to the limita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0026H02J7/0019H02J2207/20
Inventor 李勇
Owner 李勇
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