Battery disconnect unit
A battery disconnect unit including a housing, an electronic relay module installed on a charge/discharge line of a battery within the housing and including electronic switch devices capable of a switching operation of selectively blocking the flow of a current in the charge/discharge line, a heat dissipation cover provided with a structure surrounding at least a portion of the electronic relay module and formed of a material capable of heat exchange with the electronic relay module, and a cooling plate disposed in contact with the heat dissipation cover and provided to allow a refrigerant to flow in the cooling plate.
1 . A battery disconnect unit comprising:
a housing;
an electronic relay module installed on a charge/discharge line of a battery within the housing and comprising electronic switches configured to selectively block a flow of a current in the charge/discharge line;
a heat dissipation cover surrounding at least a portion of the electronic relay module and formed of a material capable of heat exchange with the electronic relay module, wherein the heat dissipation cover comprises a lower cover including an accommodating groove, wherein the electronic relay module is positioned in the accommodating groove of the lower cover; and
a cooling plate disposed in contact with the heat dissipation cover and configured to allow a refrigerant to flow in the cooling plate.
2 . The battery disconnect unit of claim 1 , wherein the electronic relay module comprises:
a first electronic relay installed on a first line that connects a positive electrode terminal of the battery to a positive electrode terminal of an external device;
a second electronic relay installed on a second line that connects a negative electrode terminal of the battery to a negative electrode terminal of the external device; and
a gate driver connected to the first electronic relay and the second electronic relay and configured to control a switching operation of the electronic switches.
3 . The battery disconnect unit of claim 2 , wherein the gate driver is a printed circuit board, and a plate surface of the gate driver is positioned perpendicular to the first electronic relay or the second electronic relay.
4 . The battery disconnect unit of claim 2 , wherein the heat dissipation cover further comprises an upper cover configured to be coupled to the lower cover,
the lower cover is a first block comprising three first protrusions on both edges and a center region of the lower cover, respectively, and two concave first accommodating grooves on respective sides of the center region,
the upper cover is a second block comprising three second protrusions aligned with the three first protrusions of the lower cover, and two second accommodating grooves aligned with the two first accommodating grooves of the lower cover, and
each of the first electronic relay and the second electronic relay is positioned in a respective space between a respective first accommodating groove and a respective second accommodating groove.
5 . The battery disconnect unit of claim 4 , wherein first heat transfer pads are positioned on surfaces of the first accommodating grooves and surfaces of the second accommodating grooves.
6 . The battery disconnect unit of claim 4 , further comprising a thermal interface material positioned between a lower surface of the lower cover and the cooling plate.
7 . The battery disconnect unit of claim 4 , wherein an upper surface of the upper cover has a convex-concave pattern structure.
8 . The battery disconnect unit of claim 1 , wherein each of the electronic switch devices is an insulated gate bipolar transistor (IGBT) or a metal oxide semiconductor field effect transistor (MOSFET).
9 . The battery disconnect unit of claim 1 , wherein the housing comprises a lower housing and a top cover configured to be coupled to each other,
the heat dissipation cover is fixedly disposed above the lower housing,
the cooling plate is fixedly disposed below the lower housing, and
a portion of the lower housing below the heat dissipation cover is open so that the heat dissipation cover and the cooling plate contact each other.
10 . The battery disconnect unit of claim 9 , further comprising a refrigerant supply pipe connected to one side of the cooling plate and a refrigerant discharge pipe connected to another side of the cooling plate.
11 . A battery pack including the battery disconnect unit of claim 1 .
12 . An electric vehicle comprising the battery pack of claim 11 .