Battery test bench and system for testing batteries

Abstract

The invention relates to a battery test bench (100) for testing batteries (200, 201), wherein the battery test bench (100) comprises a test cell (110), at least two electrical power sources (120, 121) and at least four busbars (130, 131, 132, 133), wherein the at least two electrical power sources (120, 121) are each configured to provide an electrical voltage and to provide an electrical current, and wherein the at least four busbars (130, 131, 132, 133) are configured to electrically connect the at least two electrical power sources (120, 121) to each battery (200, 201) to be tested, wherein the test cell (110) is configured to receive and arrange the at least four busbars (130, 131, 132, 133).The battery test stand (100) according to the invention is characterized in that the battery test stand (100) further comprises at least one rail bridge (150, 155), wherein the at least one rail bridge (150, 155) is designed to connect a battery (200, 201) simultaneously with the at least two electrical power sources (120, 121), so that the at least two electrical power sources (120, 121) are connected in parallel.

Description

The invention relates to a battery test bench for testing batteries according to the preamble of claim 1 and a corresponding system. It is known in the art to equip motor vehicles with a fully electric drive or with a so-called hybrid drive. In this system, a battery, also known as a traction battery, supplies one or more electric motors with electrical power to propel the vehicle. During the manufacturing process, such batteries undergo a variety of tests. These include a performance test to ensure functionality and operational reliability as part of an end-of-line test. For example, the battery under test is repeatedly charged and discharged within a short period. During these performance tests, it is important to establish reliable connections for transmitting electrical power to connect the battery under test to the test equipment. One known method is to provide, for example, a connector with a single pin and a single contact socket for each terminal of a battery, with the contacts being monitored, for example, by means of thermal sensors or other sensors. In this context, a battery test bench and a method for testing a battery cell are known from DE 10 2020 118 231 A1. The battery test bench comprises a holder for receiving a battery cell, an electrical charging device that is electrically connected to the battery cell, and a device for detecting volume changes of the battery cell. German patent application DE 10 2013 012 219 B3 discloses a battery test bench for testing at least two batteries. The battery test bench comprises a battery tester, a contactor with at least one first and one second switching stage, and a control unit for controlling the contactor. In its first switching stage, the contactor is configured to connect a first battery to the battery tester and to disconnect a second battery from the battery tester. In its second switching stage, the contactor is configured to connect the second battery to the battery tester and to disconnect the first battery from the battery tester. From EP 2 544 295 A1, a battery test stand is known, comprising a test cell in which a battery to be tested is arranged, a holder which is arranged in the test cell and is able to accommodate the battery, a control unit which can be connected to a battery arranged in the holder, at least one sensor device for monitoring the battery, wherein the sensor device is connected to the control unit, and a cooling device which is connected to the control unit and which is designed to cool the battery in the test cell from the outside in a hazardous situation. German patent DE 10 2023 202 655 A1 discloses a battery pack test system comprising a power group, a power router, a power allocation manager, and a plurality of test bench control units. The power allocation manager is configured to dynamically switch power allocations from individual power units of the plurality of power units to a plurality of test channels, each connected to a different device under test. The plurality of test bench control units are each configured to be connected via an interface to the power router and to a different corresponding device under test. Each of the test bench control units has a plurality of measuring sensors for measuring characteristics of the corresponding device under test. However, the known battery test benches are disadvantageous in that they cannot be adapted to changing testing requirements, or only to a very limited extent. It is an object of the present invention to propose an improved battery test bench for testing batteries. This problem is solved according to the invention by the battery test bench for testing batteries according to claim 1. Advantageous embodiments are described in the dependent claims. The invention relates to a battery test bench for testing batteries, in particular high-voltage batteries, such as those used in electric vehicles. The battery test bench comprises a test cell, at least two electrical power sources and at least four busbars, wherein the at least two electrical power sources are each designed to provide an electrical voltage and an electrical current, wherein the at least four busbars are designed to electrically connect the at least two electrical power sources to each battery to be tested, and wherein the test cell is designed to accommodate and arrange the at least four busbars. The invention therefore relates to a battery test bench for testing, in particular, batteries for electric vehicles or other electrical storage devices. As described, the battery test bench includes, among other things, a test cell in which all busbars and electrical contacts to or from the busbars are preferably arranged. The test cell ensures that accidents caused by unintentional contact between operating personnel and live parts of the test bench can be reliably prevented. Furthermore, the test bench can also include other elements, such as a climate chamber, conditioning, control cabinets, sensors and one or more control units. Advantageously, no electrically conductive or live parts of the battery test bench are accessible outside the test cell. The at least four busbars advantageously represent a positive path and a negative path in pairs for each battery to be tested, in order to electrically connect the battery to be tested to one of the power sources. The battery test bench can therefore, for example, test two batteries simultaneously, with each of the two batteries connected to a power source. According to the invention, the battery test bench further comprises at least one rail bridge, wherein the at least one rail bridge is designed to connect a single battery simultaneously with the at least two electrical power sources, so that the at least two electrical power sources are connected in parallel. One advantage of the invention is that the parallel connection of the power sources via the rail bridge allows for flexible adaptation of the test conditions to different batteries or different test requirements. In particular, high test currents can be achieved through the parallel connection without having to resort to special, particularly powerful power sources. This leads both to a reduction in investment costs and to an increase in the scalability and adaptability of the test bench to different requirements. Overall, this provides a flexible, safe and efficient battery test bench designed for a wide range of testing requirements. According to an advantageous embodiment of the invention, the at least one rail bridge has a positive path and a negative path, wherein the positive path and the negative path are held by a connecting element made of non-conductive material and spaced apart from each other. It is particularly preferred that the non-conductive material be a plastic. The connecting element not only serves for mechanical fixation but also ensures reliable electrical insulation between the current paths. This increases electrical safety and guarantees precise positioning of the positive and negative paths relative to each other. Furthermore, the connecting element simplifies the assembly of the parallel switching rail unit, as the paths are already pre-positioned and thus assembly errors are minimized. According to a further advantageous embodiment of the invention, the at least one rail bridge has a defined pattern of openings, wherein a first proportion of the openings is designed for contacting the at least four busbars at their contact points, and wherein a second proportion of the openings is designed as contact points for electrical connection with a battery to be tested. One advantage of this design is that the defined pattern of openings ensures a clear and error-free assignment of the connections between the rail bridge and the conductor rails. This largely eliminates the risk of incorrect connections, which in turn improves both the safety and reliability of the testing process. The defined pattern of openings also reduces the time required for setup and assembly work. According to a further advantageous embodiment of the invention, it is provided that the at least one rail bridge can be screwed to the contact points of the at least four busbars over the first part of the openings. This design offers the advantage of creating a stable mechanical connection that ensures reliable electrical contact. At the same time, the bolted connection allows for easy assembly and disassembly of the rail bridge, enabling quick and straightforward conversion work. According to a further advantageous embodiment of the invention, the test cell is provided to have guide pins for placing the at least one rail bridge. The use of such guide pins offers advantages during assembly or conversion work, as they enable fast, precise and error-free positioning of the rail bridge. According to a further advantageous embodiment of the invention, the battery test bench has two additional busbars, each of which has a larger cross-sectional area than any of the at least four busbars, wherein the two additional busbars are designed to be electrically connected to a total of two power sources. These additional busbars are specifically designed to be connected to not just one, but two power sources. This offers the advantage that, for example, the two additional busbars allow a battery to be tested with twice the power of a single power source. The increased cross-sectional area of ​​the additional busbars allows for the safe transmission of particularly high electrical currents, making tests with increased current strengths – for example, through two power sources connected in parallel – possible. It is equally possible that both power sources are assigned to the same battery test bench or that the power sources are fully or partially assigned to a different battery test bench. Therefore, one advantage of this embodiment is that it allows for simple and safe expansion or cascading of the battery test bench. The additional busbars also allow for the simple mechanical and electrical coupling of multiple battery test benches. This enables flexible adaptation of the testing capacities to a wide variety of requirements without the need for extensive and time-consuming modifications. According to the invention, the battery test bench includes an additional rail bridge, wherein the additional rail bridge is designed to connect the battery to further power sources of the further battery test bench, so that the at least two electrical power sources and the further power sources are connected in parallel. This allows the at least two electrical power sources of the battery test bench to be connected in parallel with additional power sources from other battery test benches, thus significantly increasing the available current for the testing process. One advantage of this design is therefore that particularly high test currents can be achieved through the additional rail bridge, without having to resort to other, more powerful and more expensive power sources. The additional rail bridge thus contributes significantly to the scalability and flexibility of the battery test bench. It allows for quick and easy responses to changing requirements and test conditions. According to the invention, the additional rail bridge has a defined pattern of openings, wherein a first proportion of the openings is designed for contacting the two additional busbars at their contact points, wherein a second proportion of the openings is designed for contacting the at least one rail bridge, and wherein a third proportion of the openings is designed as contact points for electrical connection with a battery to be tested. One advantage of this design is that the clearly defined and specifically arranged opening pattern ensures unambiguous and unambiguous assignment of the electrical connections. This significantly reduces the risk of assembly errors, short circuits, or incorrect connections during test bench reconfiguration. Furthermore, this design facilitates quick and easy adaptation of the battery test bench to changing requirements regarding different test scenarios or test conditions, as it clearly defines which components are to be connected and how. This increases flexibility and reduces potential sources of error during operation. According to a further advantageous embodiment of the invention, it is provided that the additional rail bridge can be screwed to the contact points of the two additional conductor rails via the first part of the openings and to the contact points of the at least one rail bridge via the second part of the openings. An advantage of this embodiment, in this case as well, is that the screw connection via defined openings enables a particularly reliable, mechanically stable, and secure electrical connection. This not only ensures reliable electrical contact with low contact resistance but also prevents the unintentional loosening or detachment of the connections during operation. According to a further advantageous embodiment of the invention, the test cell is provided to have guide pins for placing the additional rail bridge. One advantage of this design is that the guide pins allow for simple, quick, and precise positioning of the additional rail bridge. This significantly simplifies assembly and effectively prevents assembly errors that could lead to faulty electrical connections or mechanical instabilities. According to the invention, the battery test bench has a first switch, wherein the first switch is configured to be automatically actuated when the at least one rail bridge is placed, and / or the battery test bench has a second switch, wherein the second switch is configured to be automatically actuated when the additional rail bridge is placed, wherein when the first switch is actuated a lockout of the at least two electrical power sources is released, and wherein when the second switch is actuated a lockout of the further power sources is released. One advantage of this design is that the automated actuation of the switches ensures reliable and immediate verification of the correct assembly configuration. This increases operational safety, as a faulty configuration is detected and the electrical power sources are automatically shut off to prevent damage to the system and hazards to operating personnel. Furthermore, automated switch operation helps to reduce maintenance and assembly times, as manual inspection or additional checks of correct assembly are no longer necessary. This results in an overall improvement in the efficiency of the test bench, reduced downtime, and less effort required for changeovers. According to a further advantageous embodiment of the invention, the battery test bench has voltage measuring devices which are designed to detect voltage measurements of the at least four busbars and the at least one parallel busbar unit and / or to detect voltage measurements of the two further busbars and the additional parallel busbar unit and, in the event of unexpected voltage measurements, to block the at least two electrical power sources and / or to block the further power sources. One advantage of this design is that the continuous monitoring of voltage values ​​enables the immediate and reliable detection of unexpected operating conditions. This allows potential fault conditions, such as incorrect connections, short circuits, or impermissible voltage deviations, to be detected early and the electrical power sources to be automatically shut off. This also leads to increased safety of the test bench and thus to improved protection of the connected test specimens and the operating personnel. Furthermore, the voltage measurement device enables precise diagnosis and localization of fault sources, thereby accelerating and simplifying maintenance work. The automated acquisition and evaluation of measured values ​​allows for the automated detection and correction of faults, reducing downtime and improving the overall availability of the battery test bench. Furthermore, this design improves the documentation and traceability of the testing process, as all relevant stress data are continuously and accurately recorded. This allows for detailed analysis and optimization of the testing procedures. According to a further advantageous embodiment of the invention, the battery test stand comprises a transparent protective cover which covers all current-carrying components in a touch-proof manner after opening an access door and has finger-safe openings to enable voltage measurements in a secured state. One advantage of this design is the further increase in safety for operating personnel. The transparent design of the protective cover allows for visual inspection of the live components at all times without direct contact. This reduces the risk of electrical accidents. The finger-safe openings also allow for safe voltage measurement even with the access door open, without having to remove the protective cover. This not only improves workplace safety but also facilitates maintenance and diagnostic work, as necessary tests can be carried out safely and quickly. The invention further relates to a system for testing batteries. The system according to the invention is characterized in that it comprises at least two battery test benches according to the invention. This leads to the advantages already described. A further advantage is that using multiple battery test benches simultaneously allows for the efficient and parallel testing of a large number of batteries or complex battery configurations. This reduces the overall duration of the testing processes and thus increases the productivity and efficiency of the testing procedures. In addition, the power sources of several battery test benches can be connected in parallel to test a battery at particularly high power levels. According to a further advantageous embodiment of the invention, it is provided that the at least two battery test benches are identically designed. The use of identical battery test benches within the system offers advantages in terms of modularity, unification and standardization. Furthermore, the identical design of the battery test benches allows for quick and easy expansion of the entire system, as new battery test benches can be added and integrated without difficulty. This scalability ensures high flexibility in the face of varying testing requirements and offers the possibility of expanding capacity quickly and without major modifications. The invention is explained below by way of example with reference to embodiments shown in the figures. Figure 1 shows, by way of example and schematically, a battery test stand according to the invention for testing batteries; Figure 2 shows, by way of example, a rail bridge; Figure 3 shows, by way of example, the battery test stand 100 of Figure 1, wherein, however, the rail bridge is mounted in the test cell; Figure 4 shows, by way of example, a possible embodiment of a system according to the invention for testing batteries; and Figure 5 shows, by way of example, an additional rail bridge. Identical objects, functional units, and comparable components are designated across all figures using the same reference symbols. These objects, functional units, and comparable components are identical in their technical characteristics unless explicitly or implicitly stated otherwise in the description. Fig. 1 shows an exemplary and schematic battery test stand 100 according to the invention for testing batteries 200, 201. The battery test stand 100 of Fig. 1 comprises, for example, a test cell 110, two electrical power sources 120, 121, and four busbars 130, 131, 132, 133. The four busbars 130, 131, 132, 133 are arranged within the test cell 110 and are thus shielded from the environment. Since the busbars 130, 131, 132, 133 can carry high voltages and currents, they pose a general hazard to the operating personnel of the battery test stand 100. For example, test cell 110 also has a transparent protective cover (not shown in Fig. 1) which covers all current-carrying components in a touch-proof manner even after opening an access door (also not shown in Fig. 1). The two electrical power sources 120, 121 are designed as DC voltage and current sources 120, 121 and each provide a voltage and a current with which charging and discharging processes of the batteries 200, 201 can be carried out. For example, each power source 120, 121 can provide an electrical current of up to 1000 A. However, it is also possible for a power source 120, 121 to be designed to provide a higher or lower current. The four busbars 130, 131, 132, 133 serve to electrically connect the two electrical power sources 120, 121 with each of the batteries 200, 201 to be tested and are made of copper, for example. Each busbar 130, 132 connects a positive terminal of a power source 120, 121 to a positive terminal of a battery 200, 201 under test. The other busbar 131, 133 connects a negative terminal of a power source 120, 121 to a negative terminal of a battery 200, 201 under test. As can be seen further, the battery test stand 100 has two additional busbars 140, 141, which are also arranged within the test cell 110. These additional busbars 140, 141 are also made of copper, for example, but each has a larger cross-sectional area than the four busbars 130, 131, 132, 133. This means that the additional busbars 140, 141 are suitable for transporting higher electrical currents and can be connected to the two power sources 120, 121 simultaneously. The battery test stand 100 also includes a rail bridge 150 shown in Fig. 2, which is not mounted in the illustration of Fig. 1. The rail bridge 150 is designed to connect one of the two batteries 200, 201 simultaneously with the two electrical power sources 120, 121, so that the two electrical power sources 120, 121 are connected in parallel. The rail bridge 150 has a positive path 151 and a negative path 152, wherein the positive path 151 and the negative path 152 are held by a connecting element 153 made of non-conductive material and spaced apart from each other. For example, the non-conductive material is a plastic. As can be seen further, the rail bridge 150 has a defined pattern of openings 154, wherein a first part of the openings 154 is designed for contacting the four conductor rails 130, 131, 132, 133 at their contact points, and wherein a second part of the openings 154 is designed as contact points for electrical connection with the battery 200, 201 to be tested. For example, the rail bridge 150 can be bolted to the conductor rails 130, 131, 132, 133 over the first part of the openings 154. The test cell 110 also has guide pins for the placement of the conductor rails 130, 131, 132, 133 and the rail bridge 150. Furthermore, the battery test stand 100 in the test cell 110 has a first switch 112 and a second switch 113, which are designed to be automatically operated upon placement of at least one rail bridge 150. When the first switch 112 is activated by the rail bridge 150, the two electrical power sources 120 and 121 are released from their lock, allowing a test procedure to be carried out using these two electrical power sources. This ensures that the test procedure can only take place once the rail bridge 150 is correctly installed and the first switch 112 is activated. In the selected operating mode of Fig. 1, the second switch 113 does not need to be actuated. Fig. 3 shows the battery test stand 100 of Fig. 1, with the rail bridge 150 mounted in the test cell 110. As can be seen, the positive path 151 connects the two positive busbars 130, 132 to each other, and the negative path 152 connects the two negative busbars 131, 133 to each other. Via the second set of openings 154, which serve as contact points for the electrical connection to the battery 200 under test, both power sources 120, 121 are connected to a single battery 200, with the power sources 120, 121 being connected in parallel. Thus, the battery 200 can be tested with twice the current, for example, 2000 A. Fig. 4 shows an exemplary embodiment of a system 300 according to the invention for testing batteries 200, 201, which comprises a battery test stand 100 and a further battery test stand 101, wherein the further battery test stand 101 is identical to the battery test stand 100. As can be seen, the rail bridge 150, 155 is mounted on each battery test stand 100, 101. Furthermore, an additional rail bridge 160, 161 is also mounted. These additional rail bridges 160, 161 differ from the rail bridges 150, 155 and make it possible to connect the additional power sources 122, 123 of the further battery test stand 101 in parallel to the two power sources 120, 121 of the battery test stand 100, so that the battery 200 to be tested can be tested with the theoretically four times the electrical current of the individual power sources 120, 121, 122, 123. In the selected operating mode of Fig. 4, both the first two switches 112, 114 and the second two switches 113, 115 must be actuated to release the two power sources 120, 121 and the two further power sources 122, 123. The first switches 112, 114 are activated automatically upon correct installation of the rail bridges 150, 155. The second switches 113, 115 are activated automatically upon correct installation of the additional rail bridges 160, 165. An additional rail bridge 160 is shown by way of example in Fig. 5. As can be seen, the additional rail bridge 160 also has a defined pattern of openings 164, wherein a first portion of the openings 164 is designed for contacting the two additional conductor rails 140, 141 at their contact points, wherein a second portion of the openings 164 is designed for contacting the at least one rail bridge 150, 155, and wherein a third portion of the openings 164 is designed as contact points for electrical connection with the battery 200 to be tested. The additional rail bridge 160 has a positive path 161 and a negative path 162, wherein the positive path 161 and the negative path 162 are held and spaced apart from each other by a connecting element 163 made of non-conductive material. For example, the additional rail bridges 160, 165 can be bolted to the additional conductor rails 140, 141 and 142, 143, respectively, over the first part of the openings 164. Over the second part of the openings 164, the additional rail bridges 160, 165 can be bolted to the conductor rails 130, 131, 132, 133 and 134, 135, 136, 137, respectively. The test cell 110 also has guide pins for placing the additional rail bridge 160. Similarly, the test cell 116 has guide pins for the placement of the conductor rails 134, 135, 136, 137, the rail bridge 155 and the additional rail bridge 165. Reference sign 100 Battery test stand 101 Further battery test stand 110 Test cell (of battery test stand 100) 112 First switch (in test cell 110) 113 Second switch (in test cell 110) 114 First switch (in test cell 116 of further battery test stand 101) 115 Second switch (in test cell 116 of further battery test stand 101) 116 Test cell (of further battery test stand 101) 120, 121 Electrical power sources (DC voltage or current sources) 122, 123 Further electrical power sources (DC voltage or current sources of battery test stand 101) 130, 131, 132, 133 Busbars (in test cell 110) 134, 135, 136, 137 Busbars (in test cell 116) 140, 141 Additional busbars (in test cell 110 with larger cross-sectional area) 142, 143 Additional busbars (in test cell 116 with larger cross-sectional area) 150, 155 Rail bridges 151 Positive path of the rail bridge 150 152 Negative path of the rail bridge 150 153 Connecting element (made of non-conductive material,for positioning positive and negative paths) 154 Openings (in rail bridge 150, for contacting the busbars and batteries) 160, 161, 165 Additional rail bridges 161 Positive path of the additional rail bridge 160 162 Negative path of the additional rail bridge 160 163 Connecting element (made of non-conductive material, for positioning the positive and negative paths of the additional rail bridge 160) 164 Openings (in additional rail bridges 160, for contacting the additional busbars, rail bridges and batteries) 200, 201 Batteries 300 System for testing batteries (comprising battery test stands 100 and 101),

Claims

Battery test stand (100) for testing batteries (200, 201), wherein the battery test stand (100) comprises a test cell (110), at least two electrical power sources (120, 121) and at least four busbars (130, 131, 132, 133), wherein the at least two electrical power sources (120, 121) are each configured to provide an electrical voltage and to provide an electrical current, and wherein the at least four busbars (130, 131, 132, 133) are configured to electrically connect the at least two electrical power sources (120, 121) to each battery (200, 201) to be tested, wherein the test cell (110) is configured to receive and arrange the at least four busbars (130, 131, 132, 133), characterized in that the battery test stand (100) further comprises at least one rail bridge (150, 155) comprising the at least one rail bridge (150, 155) designed to support a battery (200,201) simultaneously with the at least two electrical power sources (120, 121) so that the at least two electrical power sources (120, 121) are connected in parallel, that the battery test stand (100) comprises an additional rail bridge (160, 161, 165), wherein the additional rail bridge (160, 161, 165) is configured to connect the battery (200, 201) additionally with further power sources (122, 123) of another battery test stand (101) so that the at least two electrical power sources (120, 121) and the further power sources (122, 123) are connected in parallel, that the additional rail bridge (160, 161, 165) has a defined pattern of openings (164), wherein a first proportion of the openings (164) is for contacting the two additional busbars (140, 141) is formed at their contact points, wherein a second part of the openings (164) is for contacting the at least one rail bridge (150,155) and wherein a third portion of the openings (164) is designed as contact points for electrical connection with a battery (200, 201) to be tested, and that the battery test stand (100) has a first switch (112, 114) which is automatically actuated when the at least one rail bridge (150, 155) is placed, and / or that the battery test stand (100) has a second switch (113, 115) which is automatically actuated when the additional rail bridge (160, 161, 165) is placed, wherein when the first switch (112, 114) is actuated a blocking of the at least two electrical power sources (120, 121) is released, and wherein when the second switch (113, 115) is actuated a blocking of the further power sources (122, 123). Battery test stand (100) according to claim 1, characterized in that the at least one rail bridge (150, 155) has a positive path (151) and a negative path (152), wherein the positive path (151) and the negative path (152) are held by a connecting element (153) made of non-conductive material and spaced apart from each other. Battery test stand (100) according to claim 2, characterized in that the at least one rail bridge (150, 155) has a defined pattern of openings (154), wherein a first proportion of the openings (154) is designed for contacting the at least four busbars (130, 131, 132, 133) at their contact points and wherein a second proportion of the openings (154) is designed as contact points for electrical connection with a battery (200, 201) to be tested. Battery test stand (100) according to at least one of claims 1 to 3, characterized in that the at least one rail bridge (150, 155) can be screwed to the contact points of the at least four busbars (130, 131, 132, 133) over the first part of the openings (154). Battery test stand (100) according to claim 4, characterized in that the test cell (110) has guide pins for placing the at least one rail bridge (150, 155). Battery test stand (100) according to at least one of claims 1 to 5, characterized in that the battery test stand (100) has two additional busbars (140, 141) which each have a larger cross-sectional area than each of the at least four busbars (130, 131, 132, 133), wherein the two additional busbars (140, 141) are designed to be electrically connected to a total of two power sources (120, 121). Battery test stand (100) according to claim 1, characterized in that the additional rail bridge (160, 161, 165) can be screwed to the contact points of the two additional current rails (140, 141) via the first part of the openings (164) and can be screwed to the contact points of the at least one rail bridge (150, 155) via the second part of the openings (164). Battery test stand (100) according to at least one of claims 1 to 7, characterized in that the test cell (110) has guide pins for placing the additional rail bridge (160, 161, 165). Battery test stand (100) according to at least one of claims 1 to 8, characterized in that the battery test stand (100) has voltage measuring devices which are designed to detect voltage measurements of the busbars (130, 131, 132, 133, 140, 141) and the at least one rail bridge (150, 155, 160, 161, 165) and to block the power sources (120, 121, 122, 123) in the event of unexpected voltage measurements. Battery test stand (100) according to at least one of claims 1 to 9, characterized in that the battery test stand (100) comprises a transparent protective cover which covers all current-carrying components in a touch-proof manner after opening an access door and has finger-safe openings to enable voltage measurements in a secured state. System (300) for testing batteries, comprising at least two battery test benches (100, 101) according to at least one of claims 1 to 10. System (300) according to claim 11, characterized in that the at least two battery test stands (100, 101) are identically designed.

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