Exchangeable test chamber for material testing of a specimen

Abstract

The present invention relates to a test chamber (100) for housing a specimen (150), in particular an energy storage device, during material test. The test chamber (100) comprises a chamber housing (101) and a specimen holder arrangement (102) for holding the specimen (150) to be tested, wherein the specimen holder arrangement (102) is arranged within the chamber housing (101).The chamber housing (101) comprises a receiving opening (103) for receiving a rod arrangement (104) for moving in direction to the specimen holder arrangement (102) for transmitting a mechanical load to the specimen (150). The test chamber (100) further comprises a mounting arrangement configured for detachably mounting the chamber housing (101) to an apparatus (120) for testing of a specimen (150), the apparatus (120) having an actuator (121) for moving the rod arrangement (104).

Description

[0001] Exchangeable Test Chamber for material testing of a specimen

[0002] Field of invention

[0003] The present invention relates to a test chamber for housing a specimen, in particular a energy storage device, and an apparatus comprising the test chamber for testing of a specimen. Furthermore, the present invention relates to a method for testing a specimen in a test chamber.

[0004] Art Background

[0005] In order to store renewable energy, battery technology becomes more and more important. However, battery devices have to be tested against external impacts and stress in order to provide a safe energy storage device, i.e. a battery device, without having the risk of causing damages in systems due to defects of installed battery devices.

[0006] Hence, in material testing in general and in particular in battery testing, it is necessary to expose material samples to a variety of different types of stress. For example, the material sample is subjected to tensile or compressive stress over a certain period of time. For example, a testing machine may be designed to provide a tensile testing, wherein the material sample is stretched by a specific tensile force. Furthermore, impact tests, puncture tests and bending flexural tests may be conducted by other test machines, wherein an impact element is pressed against the material sample for testing purposes. In addition, testing machines are usually designed for different types of loading speed, e.g. universal testing machines can be used for quasi-static testing only (low speeds), servo-hydraulic machines are usually used for cyclic fatigue testing and special purpose machines (special servo-hydraulic or split Hopkinson bar) for high-speed loading conditions. Specifically, the material testing has to be efficient in order to test a high amount of specimen to be tested in a given time. Additionally, specifically in battery testing, the test environment has to be protected from hazardous events, such as release of toxic gases or explosion of the battery device to be tested.

[0007] Summary of the Invention

[0008] Hence, there may be a need to provide an efficient but safe testing system for material testing of specimen, in particular of energy storage devices.

[0009] This need may be met by a test chamber for housing a specimen, by an apparatus comprising the test chamber for testing of a specimen and a by a method for testing a specimen in a test chamber according to the subject matters of independent claims.

[0010] According to a first aspect a test chamber for housing a specimen, in particular an energy storage device, during material test is presented. The test chamber comprises a chamber housing and a specimen holder arrangement for holding the specimen to be tested, wherein the specimen holder arrangement is arranged within the chamber housing. The chamber housing comprises a receiving opening for receiving a rod arrangement for moving in direction to the specimen holder for transmitting a mechanical load to the specimen. The test chamber further comprises a mounting section configured for detachably mounting the chamber housing to an apparatus for testing of a specimen, the apparatus having an actuator for moving the rod arrangement.

[0011] According to a further aspect, an apparatus for testing of a specimen is described. The apparatus comprises an above-described test chamber, wherein the test camber is detachable mounted to a supporting section, in particular a supporting plate, of the apparatus by the mounting section. The apparatus further comprises the rod arrangement extending through the receiving opening of the test camber and being moveable in direction to the specimen holder for transmitting a mechanical load to the specimen. The apparatus further comprises an actuator for moving the rod arrangement.

[0012] According to a further aspect of the present invention, a method for testing a specimen in an above-described test chamber is described. According to the method, a specimen is provided to the specimen holder arrangement within the chamber housing. The chamber housing is detachable mounted to the apparatus for testing of a specimen. The rod arrangement is moved by the actuator of the arrangement in direction to the specimen holder for transmitting a mechanical load to the specimen, wherein the rod arrangement extends through the receiving opening of the chamber housing.

[0013] The specimen to be tested by the above-described apparatus may be a material part, such as a metal or plastic element, which may have a sheet-like shape or a solid body shape. Furthermore, the specimen to be tested may be a part product, such as a semifinished or finished device. For example, the specimen to be tested may be an energy storage device / cell, an arrangement of several cells, a battery module or a battery pack. The apparatus may be used to test material mechanical properties such as tensile testing and impact testing and battery puncture tests are also possible. Hence, the specimen holder arrangement may hold the device for example in such a manner, that the rod arrangement is adapted for transmitting a mechanical load to the specimen, for example the energy storage device.

[0014] The specimen holder arrangement comprises for example a specimen holder designed for holding the specimen specifically in a detachable manner. For example, the specimen holder may comprise clamping elements for clamping the specimen to be tested. Furthermore, the specimen holder may comprise a magnet, in particular permanent magnet or an electromagnetic, in order to fix the specimen, in particular a metallic specimen, detachably to the specimen holder arrangement. Furthermore, the specimen holder arrangement is arranged within the chamber housing, such that in the chamber housing the specimen is arranged and into which chamber housing the rod arrangement may movably enter. Through the receiving opening in the chamber housing an impact element of the rod arrangement reaches the specimen attached to the specimen holder arrangement.

[0015] The rod arrangement comprises an impact element, which is designed for being pressed against the specimen to be tested. Thereby, the rod arrangement is configured for moving in the direction to the specimen holder. In a further exemplary embodiment, the rod arrangement is configured for transmitting a tractive force to the specimen. The rod arrangement is driven by the actuator and can be moved in an adjustable speed and an adjustable impact force or tractive force to the specimen. The rod arrangement may comprise an impact element and a force transmitting element, in particular a force transmitting rod, coupled to the actuator. The impact element is in particular harder than the specimen to be tested. Furthermore, the impact element may comprise a conical shape or a pyramid having an impact tip. The impact element may also comprise a hemispherical shape having a round and ball shape impact element. The impact element may also comprise an impact edge having a longitudinal extension or e.g. an impact spike / pin for applying a punctual force. Hence, the press / rod arrangement is configured for transmitting a mechanical load to the specimen. Furthermore, the impact element may be removably attached to the force transmitting element. Depending on the actual specimen holder, a variety of mechanical loads can be transmitted, such as e.g. compressive loads, tensile loads, shear loads and / or bending loads. For example, the rod arrangement may load the specimen, for example with high frequency for performing cyclic or fatigue testing, or (with the same arrangement) the rod arrangement may load the specimen statically. Also, the rod arrangement may load the specimen at high speeds for performing high strain rate testing. By the rod arrangement controlled by the actuator a force during a static test may be generated inconstant. For example, in a static test, a very slow movement of the rod arrangement with continuously increasing force up to a specified level or until rupture of the specimen is provided. However, also a so-called creep test is possible, wherein the force is kept constant over longer period of time. During a dynamic test, a faster movement of the rod arrangement with e.g. a preacceleration phase may be provided, so that specimen or load introduction device of specimen holder is hit at a specified speed and / or impact energy. All of these test cases can be performed by the described material testing apparatus.

[0016] For example, during an above-described static creep test provides a constant force over longer period of time. However, the force may be not mandatory constant. In a static test, very slow movement of the rod arrangement with continuously increasing force up to a specified level or until rupture of the specimen may be provided. In a dynamic test, a faster movement of the rod arrangement with a pre-acceleration phase so that specimen or load introduction device of the specimen holder is hit with a specified velocity and / or impact energy.

[0017] The actuator may be for example an electro motor or servo motor for driving at least one of the rod arrangement and the specimen holder arrangement in a desired speed along the impact direction and with a desired impact force. Specifically, a constant speed or an inconstant speed, i.e. an acceleration or deceleration, within the range of 0 m / s to 12 m / s may be adjusted. The electro motor is configured to move the rod arrangement relatively to the specimen holder arrangement along a longitudinal impact direction with a speed to at least 4 m / s, in particular to 10 m / s, further in particular to 12 m / s. A speed of 4 m / s means, that between the rod arrangement and the specimen holder arrangement a speed to any speed between 0 m / s to 4 m / s for transmitting a mechanical load to the specimen can be adjusted . In an exemplary embodiment, a constant speed or an inconstant speed, i.e. an acceleration or deceleration, within the range of 0 m / s to 6 m / s or within the range of 0 m / s to 4 m / s may be adjusted. For example, the rod arrangement may apply a force of 25kN when being driven with 3,6 m / s against the specimen. The electro motor is configured to adjust the (e.g. constant, inconstant (i.e. acceleration or deceleration)) speed to any speed between 0 m / s to 12 m / s between the rod arrangement and the specimen holder arrangement for transmitting a mechanical load to the specimen. At least one of the rod arrangement and the specimen holder arrangement means that the rod arrangement may be driven to the specimen holder arrangement, the specimen holder arrangement may be driven to the rod arrangement or both, the rod arrangement and the specimen holder arrangement may be both driven and hence moved with respect to each other. Specifically, a constant speed or an inconstant speed, i.e. an acceleration or deceleration, within the range of 0 m / s to 12 m / s may be adjusted. In other words, during a test time interval, the speed may be varied over time.

[0018] In an exemplary embodiment, the actuator may also function with pneumatic or hydraulic driving means. In an exemplary, the actuator may be a linear motor. The actuator is in particular configured for providing an impact energy against the specimen of more than 100J (Joule), in particular more than 200J, in particular more than 600J, in particular more, or in particular more than 800J.

[0019] The test chamber surrounds the specimen to be tested, such that the test environment outside the test chamber is protected from hazardous events that may appear during material testing inside the test chamber. The test chamber may comprise respective sidewalls, a top wall and a bottom section, such as a bottom plate. For example, the sidewalls and the top wall may be made of transparent material, such as hardened glass or plexiglass. Furthermore, at least one of the sidewalls and the top wall may be made of rigid material, such as metal material or fiber reinforced material. Specifically the ground, i.e. a ground plate, of the chamber, to which the specimen holder and the mounting section are coupled, may be robust and hence made of rigid material, such as metal material or fiber reinforced material. In the sidewall and / or the top wall, a viewing or inspection window, e.g. closed with a transparent material, may be provided.

[0020] The test chamber further comprises a mounting section having specific mounting means (e.g. accommodation holes, grooves, rails and / or pins) configured for detectably mounting the chamber housing to the test apparatus. Additionally, the chamber housing of the test chamber comprises a receiving opening, through which the respective rod arrangement for material testing may move inside the chamber housing. The mounting section may be coupled to the apparatus by magnetic forces and / or mechanical / clamping forces. A control unit may control the mounting section in order to automatically couple and decouple the test chamber to the apparatus.

[0021] Hence, by the approach of the present invention, the test chamber may be equipped with the specimen to be tested spaced apart from the apparatus. After the test chamber is equipped with the specimen to be tested, the test chamber may be attached to the apparatus such that the specimen can be tested. Thereby, the rod arrangement moves inside the chamber housing towards the specimen to conduct the above-described impact tests or tensile material tests. During the one specimen is tested, another specimen may be installed in a further test chamber spaced apart from the apparatus. If the test procedure has been finished, the test chamber and the mounting section, respectively, may be decoupled from the apparatus and moved aside. The other test chamber, which is already equipped with the next specimen to be tested may be installed to the apparatus to conduct immediately the next test procedure. Hence, a very efficient testing of a plurality of specimen in respective safe test chambers is provided.

[0022] The rod arrangement may be a part of the apparatus, wherein after the test chamber is installed at the apparatus, the rod arrangement moves inside the chamber housing for conducting the tests. However, in an alternative embodiment, the rod arrangement is part of the test chamber and may be detachably coupled to the actuator of the apparatus. Hence, the rod arrangement may be installed in the chamber housing in such a manner, that the test chamber may be removed from the apparatus together with the rod arrangement. In other words, a test chamber comprising the rod arrangement may be installed at the apparatus and after installing the test chamber to the apparatus, the rod arrangement installed in the chamber housing is (automatically) coupled to a respective actuator or force transmitting element of the apparatus, e.g. by the below described coupling element. Hence, the chamber comprising the rod arrangement may be easier sealed because no unsealed open holes exist for installing the rod arrangement, since the rod arrangement is already installed within the chamber and guided outside the chamber in a sealed manner. Furthermore, also if the chamber is removed together with the rod arrangement from the apparatus the chamber can be kept gas tight after testing.

[0023] Specifically, the rod arrangement can be moved by the actuator along an impact direction which is in particular parallel to a horizontal direction, when the apparatus is arranged on a ground. In other words, the impact direction and hence, the movement direction of the rod arrangement is perpendicular with respect to the gravitational force direction. By applying such a horizontal alignment of the rod arrangement only a minor effect or disturbance by gravity along the impact direction is caused, so that the same undisturbed movement or acceleration in both directions is possible. According to a further exemplary embodiment, the chamber housing is configured for being gastight with respect to the environment. Specifically, the chamber housing can be sealed, in particular at the receiving opening through which the rod arrangement enters. The receiving opening may be sealed for example by sealing shutter elements that can automatically open and close when the rod arrangement enters or leaves the chamber. The shutter may be for example an isolated flap which can be selectively opened.

[0024] According to a further exemplary embodiment, the chamber housing comprises at the receiving opening a gas lock for sealing a transition section between the rod arrangement and the chamber housing. In the transition section, a small gap between the housing and the rod arrangement may exist. Thereby, the rod arrangement is free of any contact with the housing.

[0025] However due to the gas lock, a sealing is provided also without any sealing contact between the housing and the rod arrangement, so that no contact pressure between the housing and the rod arrangement may be provided and therefore no force stress is generated. Thus, the sealing properties are not achieved by a direct contact between the rod arrangement and the chamber housing but by the gas lock. The gas lock is configured to seal the transitional section and at the same time allows a movement of the rod arrangement along the impact direction with respect to the chamber housing.

[0026] According to a further exemplary embodiment, the gas lock comprises at least one sealing ring mounted to the receiving opening for providing a sealing with respect to the rod arrangement.

[0027] According to further exemplary embodiment, the gas lock comprises a gas lock chamber comprising an outer wall and an inner wall which are spaced from each other. The inner wall and the outer wall comprise respective openings for guiding the rod arrangement through the gas lock chamber. The outer wall comprises a pressure control opening through which a gas is ejectable in order to provide a lower pressure in the gas lock chamber as in the chamber housing.

[0028] The inner and the outer wall may be attached, for example by gluing, to a sidewall of the chamber housing such that the inner and the outer wall cover the receiving opening of the chamber housing. The inner wall is thereby arranged within the inner volume of the chamber housing and the outer wall is arranged on an outer surface of the side wall. The inner wall in the outer wall are designed in such a manner, that the gas lock chamber is formed therebetween.

[0029] Hence, if a respective gas is ejected and removed, respectively, out of the gas lock chamber, the gas in the gas lock chamber has a lower pressure than the gas inside the chamber housing and the surrounding of the chamber. Thereby, a gas from the chamber housing and the surrounding streams into the gas lock chamber. Because the external surrounding has a higher pressure than the gas lock chamber, no gas can escape into the surrounding. Hence, no sealing means, such as a ring, is required and thus no frictional forces are transmitted to the rod arrangement. The gas that is sucked in the gas lock chamber may be further guided to an air / gas filter unit for cleaning and decontaminating the used air or gas.

[0030] According to a further exemplary embodiment, the test chamber comprises a rod supporting body for supporting the rod arrangement within the chamber housing. The rod supporting body is configured for allowing and guiding a movement of the rod arrangement within the chamber housing. The rod supporting body may be made of a robust design and material, for example metal or fiber reinforced material. The rod arrangement may for example movably lie on the rod supporting body. In an exemplary embodiment, the rod supporting body may comprise a supporting cavity and a supporting hole, respectively, for at least partially engaging the rod arrangement. Hence, proper guidance of the rod arrangement can be achieved.

[0031] According to further exemplary embodiment, the rod supporting body is mounted to a bottom plate of the chamber housing. Hence, the weight force of the rod arrangement can be transferred via the bottom plate to the apparatus in a robust manner.

[0032] According to further exemplary embodiment, the bottom plate comprises supporting grooves in which fixing elements of the rod supporting body can be inserted. The location of the rod supporting body in the chamber housing can be adjusted along the supporting grooves. The supporting grooves extend in particular perpendicular to a moving direction of the rod arrangement.

[0033] According to further exemplary embodiment, the rod supporting body comprises a supporting hole through which the rod arrangement is guidable, wherein the supporting body comprises a bearing element for movably supporting the rod arrangement along its moving direction. The bearing element may be a bearing bush or a rolling bearing, in particular a ball bearing. Hence, the guidance of the rod arrangement with a reduced friction can be provided.

[0034] According to further exemplary embodiment the supporting body comprises a sealing ring arranged within the supporting hole. Specifically, if the supporting body is arranged at the receiving opening of the chamber housing, a leakage may be caused via the supporting hole of the supporting body. Hence, the risk of such a leakage may be reduced by adding one or more sealing rings.

[0035] According to further exemplary embodiment, the supporting body is in contact to a sidewall of the chamber housing comprising the receiving opening in such a manner, that the weight force of the rod arrangement is absorbed by the supporting body instead of being absorbed by the chamber housing.

[0036] According to further exemplary embodiment, the supporting body is in gastight contact with the sidewall such that the receiving opening of the chamber housing is sealed by the supporting body. Hence, leakage due to gaps between the chamber housing and the supporting body can be sealed by contacting with a contacting surface of the supporting body the inner surface of the side wall of the chamber housing around the receiving opening. A leakage between through the supporting hole in the supporting body can be sealed by the above-described sealing ring.

[0037] According to further exemplary embodiment, the chamber housing comprises a bottom plate, wherein the bottom plate comprises the mounting section for mounting the chamber housing detachably to a supporting section (comprising e.g. a supporting plate) of the apparatus. For example, the mounting section of the chamber may comprise respective grooves which can engage respective guiding rails in the supporting section of the apparatus or vice versa. Hence, the guiding rails may extend perpendicular to the impact direction and may receive the impact force of the rod arrangement during material test via the supporting body. The test chamber may slide form a side direction perpendicular to the impact direction onto the guiding rails.

[0038] Furthermore, also a magnet coupling may be provided. For example, the mounting section of the test chamber may comprise magnetic elements. In the supporting section of the apparatus, respective magnet devices, i.e. electromagnetic elements are provided, such that by activating the electromagnetic elements, a magnetic holding force may be generated for holding the test chamber to the supporting section. According to further exemplary embodiment, the mounting section comprises at least one mounting pin being engageable in a respective accommodation hole of the apparatus. According to a further exemplary embodiment, the supporting section comprises accommodation holes for receiving the mounting pins of the test chamber, wherein the supporting section comprises in the accommodation hole controllable clamping means for fixing the mounting pins.

[0039] Hence, the test chamber may be moved along a vertical direction onto the supporting section for engaging the mounting pins in the accommodation holes. In the accommodation hole, a controllable fixing mechanism may be installed. For example, the fixing mechanism may comprise respective clamping means which may be moved in a clamping position, if the mounting pin is arranged within the accommodation hole. Furthermore, a magnetic fixing mechanism may be provided. For example, the mounting pins may be formed of a magnetic (e.g. ferromagnetic) material and inside the accommodation hole, respective electromagnetic elements are provided.

[0040] Hence, by activating the electromagnetic elements in an accommodation hole, a respective magnetic mounting pin can be fixed.

[0041] According to further exemplary embodiment, the mounting section comprises at least one mounting recess into which a respective supporting pin of the supporting section is engageable. Similar to the exemplary embodiment described above, respective supporting pins may protrude from the supporting section such that the test chamber may be arranged and aligned that the supporting pins are engaged within the mounting recesses.

[0042] According to further exemplary embodiment, the test chamber comprises the rod arrangement. The rod arrangement comprises a force transmitting rod extending through the receiving opening of the test camber. The force transmitting rod is movable along the impact direction in direction to the specimen holder for transmitting a mechanical load to the specimen. Hence, each test chamber may be equipped with the specimen to be tested and additionally with the rod arrangement. Hence, spaced apart from the apparatus, the rod arrangement may be equipped with specific shaped impact elements or with other test equipment, and may be aligned with respect to the specimen. Hence, the preassembled and readjusted test chamber may be coupled to the supporting section of the apparatus and the respective test procedures can start immediately without conducting time-consuming initial alignment and assembly steps.

[0043] According to a further exemplary embodiment, the rod arrangement comprises a coupling device arranged at an end of the force transmitting rod extending outside of the test chamber, wherein the coupling device is detachably coupleable to the actuator of the apparatus.

[0044] According to a further exemplary embodiment, the coupling device comprises a coupling pin configured for being insertable in a receiving hole of a coupling section of the apparatus, wherein the coupling pin comprises a receiving section, in particular a groove, for receiving a clamping element, in particular radially movable balls, in particular steel balls, of the apparatus.

[0045] The coupling pin extends in particular in a force transmitting direction and a moving direction of the force transmitting rod. The clamping element may be a pin or balls being pretensioned in radial direction (hence to the center axis of the force transmitting rod). Hence, upon movement of the coupling pin to the actuator, the clamping element (e.g. the clamping pin or balls in the receiving hole of the coupling section of the actuator) are pushed radially outwards until the receiving section, i.e. the groove, of the clamping pin reaches the clamping element. In this position, the clamping element is pushed by the pretension force into the receiving section, such that further relative axial movement (along the center axis of the force transmitting section) is prevented. The clamping elements may be pretensioned by respective springs. In an exemplary embodiment, the clamping elements are pretensioned in such a manner, that the clamping elements are arranged in a closed position (e.g. where the clamping elements contacts each other), wherein by an opening force (e.g. by pressurized air) the clamping elements are moved in an open position (e.g. spaced apart from each other) such that the pins may be arranged between the clamping elements. Upon removing and deactivating the opening force, the clamping elements move in the closed position and thereby clamp the pins between each other. The clamping elements may also be driven electrically, pneumatically or hydraulically for controlling the pretension force. Hence, also a decoupling of the coupling device is provided.

[0046] The coupling device may be in other words a mechanical clamping device comprising for example extending pins extending from the force transmitting rod in direction to the actuator. The actuator may comprise a coupling section having e.g. receiving holes for the pins. In the receiving holes respective clamping elements may be arranged. The pins may be clamped between the clamping elements for providing a coupling between the force transmitting rod and the actuator.

[0047] The coupling device may also form a magnet coupling. For example, the force transmitting rod may comprise magnet elements and the actuator comprise at the coupling section a controllable electromagnetic device for selectively coupling the force transmitting rod to the actuator.

[0048] Furthermore, the coupling device may also form a screw connection between the force transmitting rod and the actuator.

[0049] The actuator may comprise a respective coupling mechanism, for detachably coupling the coupling device. For example, the coupling device may comprise respective coupling pins being insertable in respective coupling holes of the actuator, and vice versa. The coupling holes may include respective clamping elements for clamping the coupling pins of the coupling device. Furthermore, also a controllable magnetic coupling may be provided.

[0050] According to a further exemplary embodiment, the test chamber further comprises at least one gas coupling mounted in the chamber housing. The gas coupling is configured for being coupled to a gas reservoir, to an external filter unit and / or to a vacuum pump of the apparatus in order to control the gas atmosphere within the chamber housing. The gas coupling may comprise for example a quick release fastener or a snap in connections in order to couple a respective gas line. Furthermore, the gas coupling may comprise a controllable valve in order to control the amount of gas flowing inside or out of the test chamber. Specifically, the gas coupling may be configured such that by moving the test chamber with respect to the apparatus along a mounting direction, the gas coupling couples automatically by a sliding movement a respective gas coupling element of the apparatus. Hence, for example specific gas concentrations in the test chamber may be adjusted. For example, the oxygen level, the CO or CO2 level, and such other hydrogen level may be increased or lowered. Furthermore, inert gas may be injected into the test chamber an order to provide an inert gas atmosphere.

[0051] According to a further exemplary embodiment, the gas coupling is formed in a bottom plate of the chamber housing such that the gas coupling is coupleable to respective gas connections arranged in a supporting section of the apparatus for supporting the test chamber.

[0052] In a further exemplary embodiment, the gas coupling may be formed inside the mounting pin formed in the bottom of the bottom plate of the chamber housing and a respective gas coupling may be formed in the accommodation hole of the supporting section of the apparatus. Hence, by lowering the test chamber onto the supporting section of the apparatus, and automatic fixation of the test chamber and an automatic gas coupling at the same time may be provided.

[0053] According to a further exemplary embodiment, the gas coupling is formed in a sidewall of the chamber housing. The sidewall is in particular the sidewall opposed to the receiving opening of the chamber housing, such that the gas coupling is coupleable to respective gas connections arranged in a gas supply section of the apparatus. Furthermore, a filling device can be coupled to the chamber for filling a desired fluid, such as the above-mentioned gas but also liquids. Specifically, the filling device can exchange the climate medium during a test of the specimen and / or during an exchange of test procedures between two specimen. The gas coupling described above may also be formed in the top wall of the chamber housing. Hence, as described above, the gas couplings are configured for providing inlets and / or outlets for e.g. inert gas or for surrounding air or gas from the external environment. The gas couplings may comprise one or more overpressure valves (e.g. via spring mechanism) which open at defined pressure in the chamber to prevent damage to the chamber. The outlets gas couplings may be connected to an external filter unit.

[0054] According to a further exemplary embodiment, the test chamber further comprises a climate regulation devices, in particular a tempering unit, a humidity control unit and / or an air filtering unit. Hence, a desired climate atmosphere within the chamber can be adjusted.

[0055] According to a further exemplary embodiment, the test chamber comprises a sensor element for measuring a climate parameter in the chamber housing, in particular the temperature, the oxygen concentration or the humidity. The sensor element and the climate regulation device may be coupled to a control device such that upon measuring respective climate parameters, the climate regulation devices can be adjusted in order to control, in particular in a self- acting manner, a desired chamber climate during material testing of the specimen. For example, the material test of the specimen can be conducted under predetermined climate requirements. For example, material test can be conducted in cold environment, such as temperatures below -40°C, or in a hot environment, such as more than 200°C.

[0056] Hence, a plurality of test chambers can be exchanged and furthermore the test chambers can be exchanged together with specific test setups for each individual specimen. Hence, by exchanging the test chambers, one test chamber can be used for a thermal test of the specimen and another test chamber can be used for testing the specimen under inert gas atmosphere, for example. The chamber may be sealed with respect to the environment so that inside the chamber, specific requirements, such as temperature, air pressure, humidity, oxygen concentration and climate medium (such as air, gas, inert gas, liquids, such as water-based fluids or oil-based fluids) can be adjusted and can be provided inside the chamber.

[0057] According to a further exemplary embodiment, the rod arrangement further comprises a force sensor for measuring the impact force between the rod arrangement and the specimen to be tested. The force sensor may be arranged between the impact element and the force transmitting rod. Hence, if the force sensor is arranged close to the impact element, a direct measurement and also a proper reachability of the force sensor is possible. Specifically, if the force sensor is mounted close to the impact element at a front no time delay of force signals during dynamic measurements is generated so that a very exact force measurement is provided. Hence, a direct signal is used instead of delayed signal e.g. from engine controller of an actuator unit. The force sensor may be detachably mounted to at least one of the impact element and the force transmitting rod. A piezoelectric sensor is e.g. a sensor that uses the piezoelectric effect to measure changes in pressure, acceleration, temperature, strain, or force by converting them to an electrical charge. For a force measurement, the piezoelectric sensor may comprise a thin membrane and a massive base, ensuring that an applied pressure specifically loads the elements in one direction and therefore creates respective electric signals indicative of the applied forces. Additionally or alternatively, also a strain gauge sensor, i.e. a DMS sensor, may be used as a force sensor for a measurement of strain of the rod arrangement.

[0058] According to a further exemplary embodiment, the test chamber further comprises an optical measuring device, in particular a high-speed camera, for optically measuring the specimen under test. Additionally or alternatively, the test chamber further comprises a displacement sensor for measuring a displacement of a part of the specimen under testing conditions, in particular under a treatment of the specimen with the rod arrangement. Hence, by the high-speed camera, e.g. deformations of the specimen under test can be made available.

[0059] A control device may be coupled to the respective sensors and the respective sensor data may be sent to a data acquisition unit, such as a central server unit, for processing the sensor data. Hence, during a test of the specimen, an exact visualization of the behavior of the specimen under test conditions can be given. The sensor data may also be used for simulation tools and other design process, for example. By processing the sensor data, also an emergency stop can be automatically initiated.

[0060] According to a further exemplary embodiment, the chamber housing comprises an assembly opening for arranging the specimen to be tested into the chamber housing. The assembly opening is in particular arranged in a top or side wall of the chamber housing, wherein the assembly opening is in particular closeable by a locking element, in particular by an opening flap. Hence, spaced apart of the apparatus, the test chamber may be equipped with the specimen by handling the specimen and e.g. the specific test setup for each individual specimen through the larger assembly opening. According to a further exemplary embodiment, the chamber housing comprises at least one handling opening for handling the specimen to be tested inside the chamber housing. The handling opening is in particular arranged in a sidewall of the chamber housing, wherein the handling opening is in particular closeable by a locking element, in particular by an opening flap. The handling opening may be configured in order to handle the specimen during a test procedure and / or if the test chamber is already mounted to the apparatus. For example, a user may insert his hands through the handling opening in order to reach the specimen. Furthermore, also automatic manipulators, such as robot arms or the like, may enter the chamber housing for the handling opening. According to a further exemplary embodiment wherein a laboratory glove is coupled to the handling opening for manipulating the test setup and / or the specimen the test chamber.

[0061] According to a further exemplary embodiment of the apparatus, the apparatus comprises a lifting mechanism coupled to the supporting section. The lifting mechanism is configured for lifting the test chamber from the supporting section to thereby decoupling the test chamber from the supporting section. Hence, if the test chamber is decoupled from the supporting section, a respective handling device, such as a robot arm, a conveyor and / or a forklift may be moved between the supporting section and the bottom plate of the test chamber for moving (automatically) the test chamber to or away from the apparatus. The lifting mechanism lifts the test chamber in particular along the vertical direction. However, the lifting mechanism may also be configured as a pushing or pulling mechanism to push or pull the test chamber along a side direction (horizontal direction), in particular perpendicular to the impact direction, onto or from the supporting section. For example, the lifting mechanism may push the test chamber along a side direction onto a conveyor belt arranged adjacent to the supporting section of the apparatus. According to further exemplary embodiment, the lifting mechanism comprises at least two, in particular three, lifting pistons configured for being extendable (and retractable) between the apparatus and the test chamber for lifting and lowering the test chamber. The lifting pistons may be driven by pneumatic, hydraulic or electric actuators.

[0062] According to a further exemplary embodiment, the apparatus comprises a handling device for transporting the test chamber to or from the supporting section. The handling device may be for example a robot arm designed for gripping the test chamber and moving the test chamber along the horizontal and also vertical direction to or from the supporting section. Furthermore, the handling device may comprise a conveyor device, for example a conveyor belt, that moves the test chamber along a sliding direction to or from the supporting section. Specifically, a sliding direction and hence the conveying direction is defined along the above-described guiding rails of the supporting section. The sliding direction may be a horizontal direction perpendicular to the impact direction. Hence, from one lateral side, the test chamber may be slid over the coupling plate for providing the material test and after the material test is accomplished, the test chamber may move along the sliding direction to and / or away from the coupling plate. Hence, an efficient loading of the apparatus for material testing is provided.

[0063] According to a further exemplary embodiment, the apparatus comprises a control unit for controlling the handling device and the actuator for equipping supporting section with a test chamber and for conducting a material test by controlling the actuator for moving the rod arrangement. The control unit may be coupled to the rod arrangement, the actuator and the test chamber for transmitting control signals in order to control the apparatus and test chamber such that a self-acting activation of the apparatus and a material test, respectively, can be provided. Additionally, the control unit is coupled to the handling device and the driving system in order to automatically move the test chamber two oh from the apparatus. Hence, an automatic and self-acting loading and unloading of the material test apparatus can be provided.

[0064] Furthermore, the control unit may comprise specimen data including for example design and material parameters of the specimen as well as predefined test procedures, such as information about the pressing force, the frequency of the rod arrangement during a dynamic test, for conducting a respective material test. Hence, by the control unit an automatic loading and unloading of the apparatus can be provided as well as an automatic operation of the material test apparatus is provided.

[0065] It has to be noted that embodiments of the invention have been described with reference to different subject matters. In particular, some embodiments have been described with reference to apparatus type claims whereas other embodiments have been described with reference to method type claims. However, a person skilled in the art will gather from the above and the following description that, unless other notified, in addition to any combination of features belonging to one type of subject matter also any combination between features relating to different subject matters, in particular between features of the apparatus type claims and features of the method type claims is considered as to be disclosed with this application.

[0066] Brief Description of the Drawings

[0067] The aspects defined above and further aspects of the present invention are apparent from the examples of embodiment to be described hereinafter and are explained with reference to the examples of embodiment. The invention will be described in more detail hereinafter with reference to examples of embodiment but to which the invention is not limited.

[0068] Fig. 1 shows a schematic side view of an apparatus with a test chamber arranged onto the supporting section of the apparatus according to an exemplary embodiment.

[0069] Fig. 2 shows a schematic perspective view of an apparatus with a test chamber moved vertically in the direction to the supporting section according to an exemplary embodiment.

[0070] Fig. 3 shows a schematic view of a rod arrangement according to an exemplary embodiment.

[0071] Fig. 4 shows a schematic view of an apparatus with a test chamber moved horizontally in the direction to the supporting section according to an exemplary embodiment.

[0072] Fig. 5 shows a schematic view of a supporting section comprising accommodation holes according to an exemplary embodiment.

[0073] Fig. 6 shows a schematic view of bottom plate of the test chamber with mounting pins according to an exemplary embodiment. Fig. 7 shows a schematic perspective view of an apparatus with a test chamber comprising respective sensors and climate control devices according to an exemplary embodiment.

[0074] Fig. 8 and Fig.9 show schematic views of a coupling device according to an exemplary embodiment.

[0075] Detailed Description of Exemplary Embodiments

[0076] The illustrations in the drawings are schematic. It is noted that in different figures similar or identical elements are provided with the same reference signs.

[0077] Fig. 1 shows a schematic side view of an apparatus 120 for testing of a specimen 150, e.g. a energy storage device, within a test chamber 100 arranged onto the supporting section 124 of the apparatus 120 according to an exemplary embodiment. The test chamber 100 comprises a chamber housing 101 and a specimen holder arrangement 102 for holding the specimen 150 to be tested, wherein the specimen holder arrangement 102 is arranged within the chamber housing 101. The chamber housing 101 comprises a receiving opening 103 for receiving a rod arrangement 104 for moving in direction to the specimen holder for transmitting a mechanical load to the specimen. The test chamber 100 further comprises a mounting section 600 configured for detachably mounting the chamber housing 101 to an apparatus 120 for testing of a specimen 150, the apparatus 120 having an actuator 121 for moving the rod arrangement 104.

[0078] The specimen holder arrangement 102 comprises for example a specimen holder designed for holding the specimen 150 specifically in a detachable manner. The specimen holder arrangement 102 comprises e.g. clamping elements for clamping the specimen 150 to be tested. Into the chamber housing 101 the rod arrangement 104 movably enters. Through the receiving opening 103 in the chamber housing 101 an impact element 113 of the rod arrangement 104 reaches the specimen 150 attached to the specimen holder arrangement 102.

[0079] The rod arrangement 104 comprises an impact element 113, which is designed for being pressed against the specimen 150 to be tested. Thereby, the rod arrangement 104 is configured for moving in the direction to the specimen holder arrangement 102. The rod arrangement 104 is also configured for transmitting a tractive force to the specimen 150. The rod arrangement 104 is driven by the actuator 121 and is moved in an adjustable speed and an adjustable impact force or tractive force to the specimen 150. The rod arrangement 104 comprises the impact element 113 and a force transmitting element, in particular a force transmitting rod, coupled to the actuator 121.

[0080] The actuator 121 is for example an electro motor or servo motor for driving the rod arrangement 104 in a desired speed along the impact direction and with a desired impact force. Specifically, a constant speed or an inconstant speed, i.e. an acceleration or deceleration, within the range of 0 m / s to 12 m / s may be adjusted.

[0081] The test chamber 100 surrounds the specimen 150 to be tested, such that the test environment outside the test chamber 100 is protected from hazardous events that may appear during testing inside the test chamber 100. The test chamber 100 may comprise respective sidewalls 110, 114, a top wall and a bottom section, such as a bottom plate 106. For example, the sidewalls 110, 114 and the top wall may be made of transparent material, such as hardened glass or plexiglass. The test chamber 100 further comprises a mounting section configured for detectably mounting the chamber housing 101 to the test apparatus 120. Additionally, the chamber housing 101 of the test chamber 100 comprises a receiving opening 103, through which the respective rod arrangement 104 for material testing may move inside the chamber housing 101. The mounting section may be coupled to the apparatus 120 by magnetic forces and / or mechanical / clamping forces. A control unit 710 (see Figure 7) may control the mounting section in order to automatically couple and decouple the test chamber 100 to the apparatus 120.

[0082] The rod arrangement 104 may be a part of the apparatus 120, wherein after the test chamber 100 is installed at the apparatus 120, the rod arrangement 104 moves inside the chamber housing 101 for conducting the tests.

[0083] The rod arrangement 104 is moved by the actuator 121 along an impact direction which is in particular parallel to a horizontal direction, when the apparatus 120 is arranged on a ground. In other words, the impact direction and hence, the movement direction of the rod arrangement 104 is perpendicular with respect to the gravitational force direction. By applying such a horizontal alignment of the rod arrangement 104 only a minor effect or disturbance by gravity along the impact direction is caused, so that the same undisturbed movement or acceleration in both directions is possible.

[0084] The chamber housing 101 is configured for being gastight with respect to the environment. Specifically, the chamber housing 101 can be sealed, in particular at the receiving opening 103 through which the rod arrangement 104 enters.

[0085] The chamber housing 101 comprises at the receiving opening 103 a gas lock 700 (see Fig. 7) for sealing a transition section between the rod arrangement 104 and the chamber housing 101. In the transition section, a small gap between the housing and the rod arrangement 104 may exist. Furthermore, a contact between the housing and the rod arrangement 104 may exist, wherein no contact pressure between the housing and the rod arrangement 104 may be provided, so that no sealing properties can be achieved by a direct contact between the rod arrangement 104 and the chamber housing 101. Hence, a gas lock 700 is provided which is configured to seal the transitional section and at the same time allows a movement of the rod arrangement 104 along the impact direction with respect to the chamber housing 101. The gas lock 700 comprises e.g. a sealing ring mounted to the receiving opening 103 for providing a sealing with respect to the rod arrangement 104.

[0086] The rod supporting body 105 is configured for allowing and guiding a movement of the rod arrangement 104 within the chamber housing 101. The rod supporting body 105 comprises a supporting hole 302 for engaging the rod arrangement 104. The rod supporting body 105 is mounted to a bottom plate 106 of the chamber housing 101. Hence, the weight force of the rod arrangement 104 can be transferred via the bottom plate 106 to the apparatus 120 in a robust manner.

[0087] The bottom plate 106 comprises supporting grooves 107 in which fixing elements of the rod supporting body 105 can be detachably inserted. The location of the rod supporting body 105 in the chamber housing 101 can be adjusted along the supporting grooves 107. The supporting grooves 107 extend in particular perpendicular to a moving direction of the rod arrangement 104.

[0088] The supporting body 105 is in contact to the sidewall 110 of the chamber housing 101 comprising the receiving opening 103 in such a manner, that the weight force of the rod arrangement 104 is absorbed by the supporting body instead of being absorbed by the chamber housing 101. The supporting body 105 is furthermore in gastight contact with the sidewall 110 such that the receiving opening 103 of the chamber housing 101 is sealed by the supporting body 105. Hence, leakage due to gaps between the chamber housing 101 and the supporting body 105 can be sealed by contacting with a contacting surface of the supporting body 105 to the inner surface of the side wall 110 of the chamber housing 101 around the receiving opening 103.

[0089] The test chamber 100 further comprises at least one gas coupling 109 mounted in the chamber housing 101. The gas coupling 109 is configured for coupling to a gas reservoir 704 (see Fig. 7) of the apparatus 120 in order to control the gas atmosphere within the chamber housing 101. The gas coupling 109 may comprise for example a quick release fastener or a snap in connections in order to couple a respective gas line. Furthermore, the gas coupling 109 may comprise a controllable valve in order to control the amount of gas flowing inside or out of the test chamber 100. Specifically, the gas coupling 109 may be configured such that by moving the test chamber 100 with respect to the apparatus 120 along a mounting direction, the gas coupling 109 couples automatically by a sliding movement a respective gas coupling 109 element of the apparatus 120. Hence, for example specific gas concentrations in the test chamber 100 may be adjusted.

[0090] The gas coupling 109 is formed in a sidewall 110 of the chamber housing 101. The sidewall 110 is in particular the sidewall 110 opposed to the receiving opening 103 of the chamber housing 101, such that the gas coupling 109 is coupleable to respective gas connections 123 arranged in a gas supply section 122 of the apparatus 120.

[0091] The chamber housing 101 comprises at least one handling opening 112 for handling the specimen 150 to be tested inside the chamber housing 101. The handling opening 112 is in particular arranged in a sidewall of the chamber housing 101, wherein the handling opening 112 is in particular closeable by a locking element, in particular by an opening flap. The handling opening 112 may be configured in order to handle the specimen 150 during a test procedure and / or if the test chamber 100 is already mounted to the apparatus 120.

[0092] In order to provide a coupling, the rod arrangement 104 comprises a coupling device 108 arranged at an end of the force transmitting rod extending outside of the test chamber 100, wherein the coupling device 108 is detachably coupleable to the actuator 121 of the apparatus 120. The actuator 121 may comprise a respective coupling mechanism, for detachably coupling the coupling device 108.

[0093] Fig. 2 shows a schematic perspective view of an apparatus 120 with a test chamber 100 moved vertically in the direction to the supporting section 124 according to an exemplary embodiment.

[0094] Furthermore, as can be seen in Fig. 2, the rod arrangement 104 may be part of the test chamber 100 and may be detachably coupled to the actuator 121 of the apparatus 120. Hence, the rod arrangement 104 may be installed in the chamber housing 101 in such a manner, that the test chamber 100 may be removed from the apparatus 120 together with the rod arrangement 104. The rod arrangement 104 comprises a force transmitting rod extending through the receiving opening 103 of the test camber 100. The force transmitting rod is movable along the impact direction in direction to the specimen holder for transmitting a mechanical load to the specimen 150. Hence, spaced apart from the apparatus 120, the rod arrangement 104 may be equipped with specific shaped impact elements 113 or with other test equipment, and may be aligned with respect to the specimen 150. Furthermore, the apparatus 120 comprises a lifting mechanism 201 coupled to the supporting section 124. The lifting mechanism 201 is configured for lifting the test chamber 100 from the supporting section 124 to thereby decoupling the test chamber 100 from the mounting section. Hence, if the test chamber 100 is decoupled from the supporting section 124, a respective handling device 401, such as a robot arm, a conveyor and / or a forklift may be moved between the supporting section 124 and the bottom plate 106 of the test chamber 100 for moving (automatically) the test chamber 100 to or away from the apparatus 120. The lifting mechanism 201 lifts the test chamber 100 in particular along the vertical direction.

[0095] The chamber housing 101 comprises an assembly opening 111 for arranging the specimen 150 to be tested into the chamber housing 101. The assembly opening 111 is in particular arranged in a top wall of the chamber housing 101, wherein the assembly opening 111 is in particular closeable by a locking element, in particular by an opening flap. Hence, spaced apart of the apparatus 120, the test chamber 100 may be equipped with the specimen 150 by handling the specimen 150 through the larger assembly opening 111.

[0096] Fig. 3 shows a schematic view of a rod arrangement 104 according to an exemplary embodiment. The rod supporting body 105 comprises a supporting hole 302 through which the rod arrangement 104 is guidable, wherein the supporting body 105 comprises a bearing element 301 for movably supporting the rod arrangement 104 along its moving direction. The bearing element 301 may be a bearing bush.

[0097] The supporting body 105 comprises additionally a sealing ring 303 arranged within the supporting hole 302. Specifically, if the supporting body 105 is arranged at the receiving opening 103 of the chamber housing 101, a leakage may be caused via the supporting hole 302 of the supporting body 105. The test chamber 100 comprising the rod arrangement 104 may be installed at the apparatus 120 and after installing the test chamber 100 detectably to the apparatus 120, the rod arrangement 104 installed in the chamber housing 101 is (automatically) coupled to a respective actuator 121 or force transmitting element of the apparatus 120.

[0098] In order to provide a coupling, the rod arrangement 104 comprises a coupling device 108 arranged at an end of the force transmitting rod extending outside of the test chamber 100, wherein the coupling device 108 is detachably coupleable to the actuator 121 of the apparatus 120. The actuator 121 may comprise a respective coupling mechanism, for detachably coupling the coupling device 108.

[0099] Fig. 4 shows a schematic view of an apparatus 120 with a test chamber 100 moved horizontally in the direction to the supporting section 124 according to an exemplary embodiment. A handling device 401 may be provided to handle the test chamber 100, in particular to move the test chamber 100 together with the rod arrangement 104 specifically along a horizontal direction. For example, the test chamber 100 together with the rod arrangement 104 may be positioned on a trolley or conveyor of the handling device 401, wherein a handling platform of the trolley is on the same vertical height as the bottom plate 106 of the test chamber 100, such that the test chamber 100 together can be pushed onto the supporting section 124 of the apparatus 120. For example, respective guiding pins arranged at the bottom plate 106 of the test chamber 100 may slide along respective supporting rules 107 of the supporting section 124. In the supporting grooves 107, stopper elements which terminates the sliding movement and thereby defines a predefined position may be provided.

[0100] Fig. 5 shows a schematic view of a supporting section 124 comprising accommodation holes 202 according to an exemplary embodiment. Respectively, Fig. 6 shows a schematic view of bottom plate 106 of the test chamber 100 with mounting pins 601 according to an exemplary embodiment.

[0101] The lifting mechanism 201 comprises four lifting pistons 501 configured for being extendable (and retractable) between the apparatus 120 and the test chamber 100 for lifting and lowering the test chamber 100. The lifting pistons 501 may be driven by pneumatic, hydraulic or electric actuators.

[0102] The mounting section comprises accommodation holes 202 for receiving mounting pins 601 of the test chamber 100, wherein the mounting section comprises controllable clamping means for fixing the mounting pins 601. The chamber housing 101 comprises a bottom plate 106, wherein the bottom plate 106 comprises a mounting section 600 for mounting the chamber housing 101 detachably to a supporting section 124 (comprising e.g. a supporting plate 124) of the apparatus 120.

[0103] The mounting pins 601 are engageable in a respective accommodation hole 202 in the supporting section 124 of the apparatus 120. The mounting section 600 comprises controllable clamping means for fixing the mounting pins 601 within the accommodation holes 202.

[0104] Hence, the test chamber 100 may be moved along a vertical direction onto the supporting section 124 for engaging the mounting pins 601 in the accommodation holes 202. In the accommodation hole 202, a controllable fixing mechanism may be installed. For example, the fixing mechanism may comprise respective clamping means which may be moved in a clamping position, if the mounting pin 601 is arranged within the accommodation hole 202. Fig. 7 shows a schematic perspective view of an apparatus 120 with a test chamber 100 comprising respective sensor elements 708 and climate control devices according to an exemplary embodiment.

[0105] The climate regulation devices may be for example a tempering unit 705, a humidity control unit 706 and / or an air filtering unit 707. Hence, a desired climate atmosphere within the test chamber lOOcan be adjusted.

[0106] The sensor element 708 measures a climate parameter in the chamber housing 101, in particular the temperature, the oxygen concentration or the humidity. The sensor element 708 and the climate regulation device may be coupled to a control unit 710 such that upon measuring respective climate parameters, the climate regulation devices can be adjusted in order to control, in particular in a self-acting manner, a desired chamber climate during material testing of the specimen 150.

[0107] The rod arrangement 104 further comprises a force sensor 709 for measuring the impact force between the rod arrangement 104 and the specimen 150 to be tested. The force sensor 709 may be arranged between the impact element 113 and the force transmitting rod. Hence, if the force sensor 709 is arranged close to the impact element 113, a direct measurement and also a proper reachability of the force sensor 709 is possible.

[0108] The test chamber 100 further comprises an optical measuring device 711, in particular a high-speed camera, for optically measuring the specimen 150 under test. Hence, by the high-speed camera, e.g. deformations of the specimen 150 under test can be made available.

[0109] A control unit 710 is coupled to the respective sensor elements 708 and the respective sensor data may be sent to a data acquisition unit, such as a central server unit, for processing the sensor data. Hence, during a test of the specimen 150, an exact visualization of the behavior of the specimen 150 under test conditions can be given. The sensor data may also be used for simulation tools and other design process, for example.

[0110] The control unit 710 is further configured for controlling the handling device 401 and the actuator 121 for equipping the apparatus 120 with a test chamber 100 and for conducting a material test. The control unit 710 is coupled to the rod arrangement 104, the actuator 121 and the specimen holder arrangement 102 for transmitting control signals in order to control the apparatus 120 such that a self-acting activation of the apparatus 120 and a material test, respectively, can be provided. Additionally, the control unit 710 is coupled to the apparatus in order to automatically clamp and release the test chamber 100. Furthermore, control unit 710 may comprise specimen data including for example design and material parameters of the specimen 150 as well as predefined test procedures, such as information about the pressing force, the frequency of the rod arrangement 104 during a dynamic test, for conducting a respective material test. Hence, by the control unit 710 an automatic loading and unloading of the apparatus 120 can be provided as well as an automatic operation of the material test apparatus 120 is provided.

[0111] The test chamber 100 further comprises at least one gas coupling 109 mounted in the chamber housing 101. The gas coupling 109 is configured for being coupled to a gas connection 123 at the gas supply section 123 and to a respective gas reservoir 704 of the apparatus 120 in order to control the gas atmosphere within the chamber housing 101. The control unit 710 may receive respective atmosphere data from the sensor element 708. Furthermore, the control unit 710 may be connected to a controllable valve at the gas connection 123, such that a respective gas flow can be controlled by the control unit 710, also during material testing. The gas coupling 109 may comprise for example a quick release fastener or a snap in connections in order to couple a respective gas line. Furthermore, the gas coupling 109 may comprise a controllable valve in order to control the amount of gas flowing inside or out of the test chamber 100. Specifically, the gas coupling 109 may be configured such that by moving the test chamber 100 with respect to the apparatus 120 along a mounting direction, the gas coupling 109 couples automatically by a sliding movement a respective gas coupling 109 element of the apparatus 120. Hence, for example specific gas concentrations in the test chamber 100 may be adjusted.

[0112] Furthermore, in Fig. 7, the gas lock 700 is shown comprising a gas lock chamber formed by an outer wall 701 and an inner wall 702 which are spaced from each other. The inner wall 702 and the outer wall 701 comprise respective openings for guiding the rod arrangement 104 through the gas lock 700 chamber. The outer wall 701 comprises a pressure control opening 703 through which gas may be removed in order to provide a lower pressure in the gas lock 700 chamber as in the chamber housing 101 and the environment.

[0113] The inner and the outer wall 701 may be attached, for example by gluing, to a sidewall 110 of the chamber housing 101 such that the inner and the outer wall 701 cover the receiving opening 103 of the chamber housing 101. The inner wall 702 is thereby arranged within the inner volume of the chamber housing 101 and the outer wall 701 is arranged on an outer surface of the side wall. The inner wall 702 in the outer wall 701 are designed in such a manner, that the gas lock 700 chamber is formed therebetween.

[0114] Hence, if a respective gas is ejected from the gas lock chamber 700, the gas in the gas lock chamber 700 has a lower pressure than the gas inside the chamber housing 101 and the surrounding, so that an exhaustion of a gas from the chamber housing 101 into the gas lock 700 chamber and further outside of the chamber housing 101 to the surrounding, respectively, is prevented.

[0115] Furthermore, a coupling device 108 is shown at an end of the rod arrangement 104 which is selectively coupleable with a coupling section 712 of the apparatus. An embodiment of the coupling device 108 and the coupling section 712 is shown in Fig. 8 and Fig. 9. Furthermore, the coupling device 108 may also form a magnet coupling. For example, the force transmitting rod may comprise magnet elements and the actuator 120 comprise at the coupling section 712 a controllable electromagnetic device for selectively coupling the force transmitting rod to the actuator 120. Furthermore, the coupling device 108 may also form a screw connection between the force transmitting rod and the actuator 120. The actuator 120 may comprise a respective coupling mechanism, for detachably coupling the coupling device 108.

[0116] Fig. 8 and Fig.9 show schematic views of a coupling device 108 schematic according to an exemplary embodiment. Fig. 8 shows a position of the force transmitting rod of the rod arrangement 104 before coupling and Fig. 9 show a position of the force transmitting rod of the rod arrangement 104 in coupling position.

[0117] In the shown embodiment, the coupling device 108 comprises a coupling pin 801 configured for being insertable in a receiving hole 802 of a coupling section 712 of the apparatus 120, wherein the coupling pin 801 comprises a receiving section, in particular a groove 803, for receiving a clamping element 804. In the exemplary embodiment, the clamping element 804 is formed by radially movable balls, in particular steel balls, of the apparatus 120.

[0118] The coupling pin 801 extends in particular in a moving direction of the force transmitting rod. The balls as clamping elements 804 being pretensioned in radial direction (hence to the center axis of the force transmitting rod). Hence, upon movement of the coupling pin 801 to the actuator 120, the balls in the receiving hole 802 of the coupling section 712 of the actuatorl20 are pushed radially outwards until the groove 803 of the clamping pin 801 reaches the balls. In this position, the balls are pushed by the pretension force into the groove 803, such that further relative axial movement (along the center axis of the force transmitting rod) is prevented.

[0119] The clamping elements 804, e.g. the balls, may be pretensioned by respective springs.

[0120] Furthermore the, the rod arrangement 104 comprises a rod flange 805 with abutting surfaces 806 and the apparatus coupling section 712 comprises an actuator flange 807 with abutting surfaces 808. As can be seen in Fig. 9, the abutting surfaces contact each other in a coupled position in Fig. 9 so that a large contact area can be formed for stabilizing the coupling also against forces in radial direction.

[0121] It should be noted that the term "comprising" does not exclude other elements or steps and "a" or "an" does not exclude a plurality. Also, elements described in association with different embodiments may be combined. It should also be noted that reference signs in the claims should not be construed as limiting the scope of the claims.

[0122] List of reference signs:

[0123] 100 test chamber 401 handling device

[0124] 101 chamber housing

[0125] 102 specimen holder arrangement 501 lifting piston

[0126] 103 receiving opening

[0127] 104 rod arrangement / force 600 mounting section transmitting rod 601 mounting pin

[0128] 105 rod supporting body

[0129] 106 bottom plate 700 gas lock

[0130] 107 supporting groove 701 outer wall

[0131] 108 coupling device 702 inner wall

[0132] 109 gas coupling 703 pressure control opening

[0133] 110 sidewall 704 gas reservoir

[0134] 111 assembly opening 705 tempering unit

[0135] 112 handling opening 706 humidity control unit

[0136] 113 impact element 707 air filtering unit

[0137] 114 sidewall 708 sensor element

[0138] 120 apparatus 709 force sensor

[0139] 121 actuator 710 control unit

[0140] 122 gas supply section 711 optical measuring device

[0141] 123 gas connection 712 apparatus coupling section

[0142] 124 supporting section / plate

[0143] 801 coupling pin

[0144] 150 specimen 802 receiving hole

[0145] 803 groove

[0146] 201 lifting mechanism 804 clamping element

[0147] 202 accommodation hole 805 rod flange

[0148] 806 abutting surfaces

[0149] 301 bearing element 807 actuator flange

[0150] 302 supporting hole 808 abutting surfaces

[0151] 303 sealing ring

Claims

C l a i m s1. Test chamber (100) for housing a specimen (150), in particular an energy storage device, during material test, the test chamber (100) comprises a chamber housing (101), a specimen holder arrangement (102) for holding the specimen (150) to be tested, wherein the specimen holder arrangement (102) is arranged within the chamber housing (101), wherein the chamber housing (101) comprises a receiving opening (103) for receiving a rod arrangement (104) for moving in direction to the specimen holder arrangement (102) for transmitting a mechanical load to the specimen (150), a mounting section (600) configured for detachably mounting the chamber housing (101) to an apparatus (120) for testing of a specimen (150), the apparatus (120) having an actuator (121) for moving the rod arrangement (104).

2. Test chamber (100) according to claim 1, wherein the chamber housing (101) is configured for being gastight with respect to the environment.

3. Test chamber (100) according to claim 1 or 2, wherein the chamber housing (101) comprises at the receiving opening (103) a gas lock (700) for sealing a transition section between the rod arrangement (104) and the chamber housing (101).

4. Test chamber (100) according to claim 3, wherein the gas lock (700) comprises at least one sealing ring mounted to the receiving opening (103) for providing a sealing with respect to the rod arrangement (104).

5. Test chamber (100) according to claim 3 or 4, wherein the gas lock (700) comprises a gas lock (700) chamber comprising an outer wall (701) and an inner wall (702) which are spaced from each other, wherein the inner wall (702) and the outer wall (701) comprise respective openings for guiding the rod arrangement (104) through the gas lock (700) chamber, wherein the outer wall (701) comprises a pressure control opening (703) through which a pressurized gas is ejectable in order to provide a lower pressure in the gas lock (700) chamber as in the chamber housing (101).

6. Test chamber (100) according to one of the claims 1 to 5, further comprising a rod supporting body (105) for supporting the rod arrangement (104) within the chamber housing (101), wherein the rod supporting body (105) is configured for allowing and guiding a movement of the rod arrangement (104) within the chamber housing (101).

7. Test chamber (100) according to claim 6, wherein the rod supporting body (105) is mounted to a bottom plate (106) of the chamber housing (101).

8. Test chamber (100) according to claim 7, wherein the bottom plate (106) comprises supporting grooves (107) in which fixing elements of the rod supporting body (105) are insertable, wherein the location of the rod supporting body (105) in the chamber housing (101) is adjustable along the supporting grooves (107), wherein the supporting grooves (107) extend in particular perpendicular to a moving direction of the rod arrangement (104).

9. Test chamber (100) according to one of the claims 6 to 8,wherein the rod supporting body (105) comprises a supporting hole (302) through which the rod arrangement (104) is guidable, wherein the supporting body comprises a bearing element (301) for movably supporting the rod arrangement (104) along its moving direction.

10. Test chamber (100) according to claim 9, wherein the bearing element (301) is a bearing bush or a rolling bearing, in particular a ball bearing.

11. Test chamber (100) according to claim 9 or 10, wherein the supporting body comprises one or more sealing rings arranged within the supporting hole (302).

12. Test chamber (100) according to one of the claims 9 to 11, wherein the supporting body is in contact to a sidewall (110) of the chamber housing (101) comprising the receiving opening (103) in such a manner, that the weight force of the rod arrangement (104) is absorbed by the supporting body.

13. Test chamber (100) according to one of the claims 9 to 12, wherein the supporting body is in gastight contact with the sidewall (110) such that the receiving opening (103) of the chamber housing (101) is sealed by the supporting body.

14. Test chamber (100) according to one of the claims 1 to 13, wherein the chamber housing (101) comprises a bottom plate (106), wherein the bottom plate (106) comprises a mounting section (600) for mounting the chamber housing (101) detachably to a supporting section (124) of the apparatus (120).

15. Test chamber (100) according to claim 14,wherein the mounting section (600) comprises at least one mounting pin (601) being engageable in a respective accommodation hole (202) of the apparatus (120).

16. Test chamber (100) according to claim 14 or 15, wherein the mounting section (600) comprises at least one mounting recess into which a respective supporting pin of the supporting section (124) is engageable.

17. Test chamber (100) according to one of the claims 1 to 16, wherein the test chamber (100) comprises the rod arrangement (104), wherein the rod arrangement (104) comprises a force transmitting rod extending through the receiving opening (103) of the test chamber, and being moveable in direction to the specimen holder arrangement (102) for transmitting a mechanical load to the specimen (150).

18. Test chamber (100) according claim 17, wherein the rod arrangement (104) comprises a coupling device (108) arranged at an end of the force transmitting rod extending outside of the test chamber (100), wherein the coupling device (108) is detachably coupleable to the actuator (121) of the apparatus (120).

19. Test chamber (100) according claim 18, wherein the coupling device (108) comprises a coupling pin (801) configured for being insertable in an actuator receiving hole (802) of a coupling section (712) of the apparatus (120), wherein the coupling pin (801) comprises a receiving section, in particular a groove (803), for receiving a clamping element (804), in particular radially movable balls, in particular steel balls, of the apparatus (120).

20. Test chamber (100) according to one of the claims 1 to 19, further comprising at least one gas coupling (109) mounted in the chamber housing (101), wherein the gas coupling (109) is configured for coupling to a gas reservoir (704), to an external filter unit and / or to a vacuum pump of the apparatus (120) in order to control the gas atmosphere within the chamber housing (101).

21. Test chamber (100) according claim 20, wherein the gas coupling (109) is formed in a bottom plate (106) of the chamber housing (101) such that the gas coupling (109) is coupleable to respective gas connections (123) arranged in a supporting section (124) of the apparatus (120) for supporting the test chamber (100).

22. Test chamber (100) according claim 20 or 21, wherein the gas coupling (109) is formed in a sidewall (114) of the chamber housing (101), wherein the sidewall (114) is in particular the sidewall (110) opposed to the receiving opening (103) of the chamber housing (101) and or to a top wall of the chamber housing (101), such that the gas coupling (109) is coupleable to respective gas connections (123) arranged in a gas supply section (122) of the apparatus (120).

23. Test chamber (100) according to one of the claims 1 to 22, further comprising a climate regulation devices, in particular a tempering unit (705), a humidity control unit (706) and / or an air filtering unit (707).

24. Test chamber (100) according to one of the claims 1 to 23, further comprisinga sensor element (708) for measuring a climate parameter in the chamber housing (101), in particular the temperature, the oxygen concentration or the humidity.

25. Test chamber (100) according to one of the claims 1 to 24, wherein the rod arrangement (104) further comprises a force sensor (709) for measuring the impact force between the rod arrangement (104) and the specimen (150) to be tested.

26. Test chamber (100) according to one of the claims 1 to 25, further comprising an optical measuring device (711), in particular a high-speed camera, for optically measuring the specimen (150) under test, and / or a displacement sensor for measuring a displacement of a part of the specimen (150) under testing conditions, in particular under a treatment of the specimen (150) with the rod arrangement (104).

27. Test chamber (100) according to one of the claims 1 to 26, wherein the chamber housing (101) comprises an assembly opening (111) for arranging the specimen (150) to be tested into the chamber housing (101), wherein the assembly opening (111) is in particular arranged in a top wall of the chamber housing (101), wherein the assembly opening (111) is in particular closeable by a locking element, in particular by an opening flap.

28. Test chamber (100) according to one of the claims 1 to 27, wherein the chamber housing (101) comprises at least one handling opening (112) for handling the specimen (150) to be tested inside the chamber housing (101), wherein the handling opening (112) is in particular arranged in a sidewall of the chamber housing (101),wherein the handling opening (112) is in particular closeable by a locking element, in particular by an opening flap.

29. Test chamber (100) according to claim 28, wherein a laboratory glove is coupled to the handling opening (112) for manipulating the test setup and / or the specimen (150) inside the test chamber (100).

30. Apparatus (120) for testing of a specimen (150), the apparatus (120) comprises a test chamber (100) according to one of the claims 1 to 29, wherein the test camber is detachable mounted to a supporting section (124), in particular a supporting plate, of the apparatus (120) by the mounting section (600), a rod arrangement (104) extending through the receiving opening (103) of the test camber, and being moveable in direction to the specimen holder arrangement (102) for transmitting a mechanical load to the specimen (150), an actuator (121) for moving the rod arrangement (104).

31. Apparatus (120) according to claim 30, further comprising a lifting mechanism (201) coupled to the supporting section (124), wherein the lifting mechanism (201) is configured for lifting the test chamber (100) from the supporting section (124) to thereby decoupling the test chamber (100) from the supporting section (124).

32. Apparatus (120) according to claim 30, wherein the lifting mechanism (201) comprises at least two, in particular three, lifting pistons (501) configured for being extendable between the apparatus (120) and the test chamber (100) for lifting and lowering the test chamber (100).

33. Apparatus (120) according to one of the claims 30 to 32, wherein the supporting section (124) comprises accommodation holes (202) for receiving mounting pins (601) of the test chamber (100), wherein the supporting section (124) comprises controllable clamping means for fixing the mounting pins (601).

34. Apparatus (120) according to one of the claims 30 to 32, further comprising a handling device (401) for transporting the test chamber (100) to or from the supporting section (124), wherein the handling device (401) comprises in particular a robot arm, a conveyor and / or a forklift.

35. Apparatus (120) according to one of the claims 30 to 34, further comprising a control unit (710) for controlling the handling device (401) and the actuator (121) for equipping supporting section (124) with a test chamber (100) and for conducting a material test by controlling the actuator (121) for moving the rod arrangement (104).

36. Method for testing a specimen (150) in a test chamber (100) according to one of the claims 1 to 29, the method comprising providing a specimen (150) to the specimen holder arrangement (102) within the chamber housing (101), detachably mounting the chamber housing (101) to the apparatus (120) for testing of a specimen (150), moving the rod arrangement (104) by the actuator (121) of the arrangement in direction to the specimen holder arrangement (102) for transmitting a mechanical load to the specimen (150), wherein the rod arrangement (104) extends through the receiving opening (103) of the chamber housing (101).

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