An assembly for a vehicle comprising at least two battery blocks, each having a casing in which the battery block is enclosed and that has a connection face. The outer skin of the vehicle has an outlet orifice. There is a main duct connected to the outlet orifice. For each casing, an evacuation duct is connected between the connection face and the main duct. A damping unit is provided at the joint between each connection face and the evacuation duct. A damping unit is provided at the joint between the main duct and the outlet orifice. Each damping unit limits the amplitude of an overpressure propagating from the casing towards the outlet orifice. Such an assembly enables an overpressure to be damped in the event of a battery being damaged, inter alia.

A vent for an electric vehicle battery pack configured to transition from a venting, open position to a sealed, closed position in the event of a thermal event experienced by the electric vehicle battery pack, thereby trapping the gasses within the electric vehicle battery pack, including a curved disc shaped and sized to selectively seal an aperture defined by the electric vehicle battery pack, the curved disc formed of a first material on a first major surface of the disc, and a second material positioned on an opposing second major surface of the disc, the first material having a larger coefficient of thermal expansion than the second material, such that an increase in temperature above a defined threshold experienced by the curved disc causes the first material to expand more than the second material, thereby transitioning the curved disc from a first equilibrium state to a second equilibrium state.

A vent for an electric vehicle battery pack configured to transition from a venting, open position to a sealed, closed position in the event of a thermal event experienced by the electric vehicle battery pack, thereby trapping the gasses within the electric vehicle battery pack, including a curved disc shaped and sized to selectively seal an aperture defined by the electric vehicle battery pack, the curved disc formed of a first material on a first major surface of the disc, and a second material positioned on an opposing second major surface of the disc, the first material having a larger coefficient of thermal expansion than the second material, such that an increase in temperature above a defined threshold experienced by the curved disc causes the first material to expand more than the second material, thereby transitioning the curved disc from a first equilibrium state to a second equilibrium state.

A battery vent assembly that includes an expanded metal filter collar which acts as a heat sink to cool and overheating battery. Further the vent assembly acts as a particulate filter and flame arrestor which prevents and/or reduces flames and particulate slag projectiles from being expelled outside an individual cell or bank of cells in a battery. The Directional Flow Expanded Metal (DFEM) and Variable Expanded Metal (VEM) utilizes directional fins and associated plethora of openings offset in overlapping layers to create a centrifuge or cyclone effect for gases or particles passing through the filter. The fins and holes are offset from layer to layer within the wrap of the collar filter and are designed to immediately change the direction of the flames and burning particles relative to the input flame flow direction.

A battery vent assembly that includes an expanded metal filter collar which acts as a heat sink to cool and overheating battery. Further the vent assembly acts as a particulate filter and flame arrestor which prevents and/or reduces flames and particulate slag projectiles from being expelled outside an individual cell or bank of cells in a battery. The Directional Flow Expanded Metal (DFEM) and Variable Expanded Metal (VEM) utilizes directional fins and associated plethora of openings offset in overlapping layers to create a centrifuge or cyclone effect for gases or particles passing through the filter. The fins and holes are offset from layer to layer within the wrap of the collar filter and are designed to immediately change the direction of the flames and burning particles relative to the input flame flow direction.

A prismatic lithium ion battery cell includes a packaging having a cover. The cover includes: a first spiral disk feature disposed below a first terminal pad; a second spiral disk feature disposed below a second terminal pad; a first reversal disk disposed below the first spiral disk feature; and a second reversal disk disposed below the second spiral disk feature. The first and second reversal disks are configured to deflect upwards to displace the first and second spiral disk features to contact the first and second terminal pads, respectively, in response to a pressure within the packaging being greater than a predefined pressure threshold and form an external short-circuit between the first and second terminal pads via the first and second spiral disk features. Subsequently, a portion of the power assembly fails in response to the external short-circuit and interrupts current flow between the first and second terminal pads.

A prismatic lithium ion battery cell includes a packaging having a cover. The cover includes: a first spiral disk feature disposed below a first terminal pad; a second spiral disk feature disposed below a second terminal pad; a first reversal disk disposed below the first spiral disk feature; and a second reversal disk disposed below the second spiral disk feature. The first and second reversal disks are configured to deflect upwards to displace the first and second spiral disk features to contact the first and second terminal pads, respectively, in response to a pressure within the packaging being greater than a predefined pressure threshold and form an external short-circuit between the first and second terminal pads via the first and second spiral disk features. Subsequently, a portion of the power assembly fails in response to the external short-circuit and interrupts current flow between the first and second terminal pads.

Vented cells are held in a cell holder, which is also vented, to provide an escape path for gases that may be produced by failing or overloaded cells. The escape path leads to the outside of the cell holder, which is mounted in an enclosure forming the battery pack. The enclosure is also vented, via a pressure-relief valve, which allows for the escape of hot cell gases to the surrounding air. A cell holder is made up of a top tray, an intermediate tray and a frame. A venting path is formed between the top and intermediate trays.

Vented cells are held in a cell holder, which is also vented, to provide an escape path for gases that may be produced by failing or overloaded cells. The escape path leads to the outside of the cell holder, which is mounted in an enclosure forming the battery pack. The enclosure is also vented, via a pressure-relief valve, which allows for the escape of hot cell gases to the surrounding air. A cell holder is made up of a top tray, an intermediate tray and a frame. A venting path is formed between the top and intermediate trays.

A battery case for a secondary battery according to an embodiment of the present invention for achieving the object can include a cup part provided with an accommodation space configured to accommodate an electrode assembly formed by stacking an electrode and a separator; a sealing part extending outward from the cup part; and a gas discharge part which is attached from the inside to a hole formed by perforating at least one of the cup part or the sealing part and through which a gas passes. The gas discharge part can include a gas discharge layer through which the gas passes; and an outer functional layer which is formed on an outer surface of the gas discharge layer and has hydrophobicity.