Vacuum electric transfer switch for lithium battery energy storage power station

Abstract

The invention discloses a vacuum type electric change-over switch for a lithium battery energy storage station. The vacuum type electric change-over switch comprises a base, switch units, a control mechanism, a driving mechanism and a quick-break clutch; the switch units are symmetrically arranged at the two sides of the control mechanism; movable contacts in the switch units are set to be vacuum, and the driving mechanism drives the control mechanism to realize switch change-over; and the quick-break clutch is provided with a return cam, and a return spring and a return swing link are added to provide return acting forces. According to the vacuum type electric change-over switch for the lithium battery energy storage station provided by the invention, a contact inside a switch shell is set to be vacuum, which effectively avoids the generation of electric sparks at the contact during switch change-over, and obviously prolongs the service life of the switch; and besides, through the quick-break clutch, a normally open contact can be quickly disconnected after being connected, so that the equalizing current cannot cause damage to circuit components and batteries because of the too large current.

Description

technical field [0001] The invention relates to a transfer switch, in particular to a vacuum electric transfer switch. Background technique [0002] With the rapid development of renewable energy construction in my country, lithium batteries are widely used in power grid energy storage (power auxiliary services, renewable energy grid connection, peak shaving and valley filling, etc.), base station backup power, home optical storage systems, and electric vehicle optical storage charging. The market scale in fields such as power stations is expanding day by day; the capacity of lithium battery energy storage power stations is large, and a large number of single batteries need to be connected in series and parallel to form a battery pack. Series connection can increase the voltage of the battery pack, and parallel connection can increase the capacity of the battery pack; During the use of the battery, due to the differences in its own parameters and leakage current, etc., it is p...

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Problems solved by technology

[0002] With the rapid development of renewable energy construction in my country, lithium batteries are widely used in power grid energy storage (power auxiliary services, renewable energy grid connection, peak shaving and valley filling, etc.), base station backup power, home optical storage systems, and electric vehicle optical storage charging. The market scale in fields such as power stations is expanding day by day; the capacity of lithium battery energy storage power stations is large, and a large number of single batteries need to be connected in series and parallel to form a battery pack. Series connection can increase the voltage of the battery pack, and parallel connection can increase the capacity of the battery pack; During the use of the battery, due to the differences in its own parameters and leakage current, etc., it is prone to unbalanced charging and discharging of the single battery, which is an important factor restricting the service life of the lithium battery energy storage power station; The equalization operation is to change the series connection to parallel connection, and balance the single cells or battery packs with different charge and discharge levels. If there is a large difference between the single cells or battery packs, it is easy to have a large balance current. Damage to single battery or circuit

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