NOVELTY - The pressure relief component has at least one notch designed as a predetermined breaking point where the pressure relief component breaks at a certain level of overpressure, thus irreversibly opening an exhaust path for the gaseous medium. The pressure relief component may be provided in plate form or disc form, and is made out of rigid plastic material or unplasticized plastic material. The pressure relief component has an injection side through which plastic material can be injected during manufacture, and a pressure side which is arranged for being charged with the gaseous medium.    USE - Pressure relief component for use as overpressure safety component in electrochemical battery (claimed). Can be used as an overpressure safety component in devices where a gaseous medium must be rapidly released in case of overpressure in electrochemical batteries used in hybrid and electric vehicles.    ADVANTAGE - Provides an overpressure safety component which can be easily and cheaply manufactured, and which can be used in a wide range of applications. Provides the overpressure safety component in the form of a pressure relief component which can be a gas-permeable component that always allows a certain flow of gas, or can be gas-tight before it breaks. Ensures that the outer contour of the pressure relief component can have a circular shape, an oval shape, a rectangular shape, a square shape, or any other shape suitable for a particular application. Ensures that the pressure relief component can be made out of plastic material, allowing to combine inexpensive manufacture, in particular for the mass production of pressure relief components, with a determinable safe design of the breaking point in the form of a notch. Ensures manufacture of large numbers of pressure relief component with current mass production technologies with a high repeat accuracy of the level of overpressure upon which the breaking point reacts. Allows for reliable production of the pressure relief component out of plastic material with a high degree of fulfillment of specifications and a high degree of repeat accuracy. Provides a pressure relief device or exhaust extension that can fulfill more than one function, making it a multifunctional device. Allows easy and quick mounting of pressure relief device on a housing wall of the housing of the battery due to the inclusion of a fixation component for fixing the exhaust extension to the housing wall of the housing of the battery. Enables the rapid pressure equalization between the battery and the environment when a cell releases a large amount of gas due to, e.g., overload, short circuit.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a pressure relief device for electrochemical battery; and    (2) an electrochemical battery.    DESCRIPTION OF DRAWING(S) - The drawing shows the perspective view of a battery with electrochemical cells.    Electrochemical battery (1)    Battery housing (2)    Electrochemical cells (3)    Pressure relief device (4)    Tube (5)    Wall of housing (6)