Bidirectional active equalization circuit based on synchronous flyback DC/DC converter
An active equalization and converter technology, applied in charge equalization circuits, arrangement of multiple synchronous batteries, circuit devices, etc., to achieve high reliability, rapid voltage equalization, and good use effects.
Inactive Publication Date: 2016-12-14
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology
[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a method of synchronous control, which solves the problem of bidirectional fast transfer of energy in the battery cell, and has the advantage of quickly realizing the voltage balance of lithium-ion battery packs. Bidirectional Active Equalization Circuit for Synchronous Flyback DC / DC Converter
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[0025] The present invention aims at the disadvantage of poor energy utilization efficiency caused by the need to dissipate the energy in the high-voltage monomer as heat to achieve the lithium-ion battery pack equalization technology with the existing parallel resistance, and realizes the lithium-ion battery by adopting the method of energy transfer The voltage equalization of each battery cell in the group means that the energy in the high-voltage cell is transferred to the low-voltage cell in an orderly manner to achieve the consistency of the series cell voltage. The present invention will be described in detail below with reference to the accompanying drawings.
[0026] Such as figure 1 Shown is a schematic diagram of the structure of a bidirectional active equalization circuit based on a synchronous flyback DC / DC converter, including a lithium-ion battery pack terminal, a voltage acquisition circuit, a synchronous flyback DC / DC converter, a core control unit, and Terminals (...
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A bidirectional active equalization circuit based on a synchronous flyback DC / DC converter comprises a lithium ion battery pack, a voltage acquisition circuit, a synchronous flyback DC / DC converter module and a core control unit, wherein the lithium ion battery pack includes a plurality of battery cells, the synchronous flyback DC / DC converter module includes a plurality of inverters, the voltage acquisition module collects the cell voltage, the charging current or the discharging current of each battery, and the core control unit calculates charging and discharging electric quantity of each battery and controls the inverters to charge the batteries according to the charge and discharge electric quantity to ensure the battery voltage balance in the current lithium ion battery pack. The bidirectional active equalization circuit actively balances the circuit, and solves the problem that the voltage of the battery cells is unbalanced in the lithium ion battery pack. Compared with the prior art, the bidirectional active equalization circuit realizes the voltage equalization of a lithium ion battery pack, and has the advantages of simple circuit structure and control logic and high reliability.
Description
Technical field [0001] The invention relates to the technical field of lithium-ion battery packs, in particular to a bidirectional active equalization circuit based on a synchronous flyback DC / DC converter. Background technique [0002] Lithium-ion battery packs are composed of multiple lithium-ion monomers in series and parallel. Due to the differences of the monomers, there will be voltage differences between different series-connected monomers in the lithium-ion battery pack during the charging and discharging process. If not effective Control, some lithium-ion battery cells will have overcharge and overdischarge, which will seriously affect the power supply safety and service life of the lithium-ion battery pack. Therefore, during the charging and discharging process of the lithium-ion battery pack, a balanced method will be used to eliminate different series The difference in voltage between cells. [0003] The simplest method in the existing lithium-ion battery pack equaliza...
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Login to View More IPC IPC(8): H02J7/00H02M3/335
CPCH02J7/0018H02M3/33561H02M3/33584H02M3/33592
Inventor 雷英俊马亮石海平赵长江井元良张文佳
Owner BEIJING INST OF SPACECRAFT SYST ENG