Carrier platform for a battery exchange system, carrier platform holder, system comprising at least one carrier platform and one carrier platform holder, and electric-powered agricultural vehicle

Abstract

Carrier platform (1) of a battery exchange system comprising a support plate (2) with an upper side (3) and a lower side (4), wherein the lower side (4) has a guide device (5) for pallet fork tines (21), wherein the upper side (3) has a holding device (6) for a battery, wherein the guide device (5) enables a pallet fork tine (21) to pass through and / or grip around, wherein the guide device (5) has a centering device (9) for pallet fork tines (21) which effects a vertical and / or horizontal centering of a pallet fork, and wherein the carrier platform (1) has connecting and securing means (39) for detachable connection to a carrier platform holder (19).

Description

[0001] The present invention relates to a carrier platform for a battery exchange system, a carrier platform holder, a system comprising at least one carrier platform and a carrier platform holder, and an electric agricultural vehicle comprising a carrier platform and / or such a carrier platform holder.

[0002] The electrification of agricultural vehicles is also gaining ground in order to reduce CO2 emissions and thus achieve the sectoral targets of the German Climate Action Plan. At the same time, it aims to reduce agriculture's dependence on diesel fuel, which is not readily available in the long term. Electrifying agricultural vehicles allows farmers to use energy generated on-site and reduces noise and exhaust emissions. These vehicles include tractors and other mobile agricultural machinery such as telescopic handlers, Unimogs, hillside tractors, and similar equipment. Therefore, the term "tractor" in the following text refers specifically to tractors and more generally to mobile agricultural vehicles.

[0003] Hydrogen could theoretically be considered as an alternative fuel. However, this alternative fuel suffers from poor efficiency, high infrastructure costs depending on the process, the technical difficulties of the required high pressures or low temperatures, and a relatively low volumetric energy density. Furthermore, the overload capacity of hydrogen-powered fuel cells is limited. Therefore, it is unlikely that hydrogen will play a significant role as an energy source in agriculture in the near future.

[0004] The use of batteries also has its drawbacks. While battery operation is the most technically and economically viable electrification solution for vehicles with lower power requirements, such as passenger cars, this is not necessarily the case for vehicles with high power requirements. Firstly, batteries still have a lower gravimetric energy density compared to diesel fuel. Secondly, they are heavier and thus increase the ground pressure of the vehicles, which should ideally be reduced to avoid or minimize harmful soil compaction. Compared to diesel-powered vehicles, charging times are long, resulting in uneconomical downtime. Furthermore, investment costs increase with rising energy demands.

[0005] Electrifying tractors with a power output of up to 100 hp, as used particularly on small and medium-sized farms, makes perfect sense. On such farms, long distances to the work site are typically short, and the vehicle regularly returns to the farm. Battery swapping or charging can be done during lunch breaks or at the end of the workday. Furthermore, swapping and / or charging infrastructure is only required at one location. These types of farms very often have energy generation facilities such as photovoltaic and / or biogas plants. Tractors are generally designed to accommodate variable and heavy implements, and changing implements is a familiar task for farmers. Finally, around 25% to 33% of the diesel fuel used in agriculture is consumed for on-farm operations, such as feeding.

[0006] Tractors and other mobile work machines such as telescopic handlers, Unimogs, slope tractors, and similar vehicles with permanently installed batteries are known, as are tractors with a single, replaceable battery. With these, the vehicle must be switched off before and during the battery change. This necessitates separate lifting equipment; changing the battery under the vehicle's own power is not possible, nor is changing it at just any location. Such lifting equipment is also required because these replaceable batteries typically weigh more than 50 kg and can easily reach weights of several hundred kg.

[0007] The company Agromec has converted a Fendt 700 Vario electric tractor to have a replaceable front battery. This tractor can independently disconnect and connect to a replacement battery of the same type and capacity.

[0008] The invention therefore aims to provide a carrier platform for a more variable battery exchange system, a carrier platform holder, a system consisting of these, and a corresponding electric agricultural vehicle.

[0009] The first problem is solved primarily by eliminating the need to move the interchangeable battery itself, instead using a carrier platform on which the interchangeable battery is securely mounted for transport. Specifically, the problem is solved by a carrier platform of a battery exchange system comprising a support plate with a top and a bottom surface. The bottom surface has a guide for pallet fork tines, the top surface has a holding device for a battery, the guide allows for penetration and / or gripping by a pallet fork tine, the guide includes a centering device for pallet fork tines that effects vertical and / or horizontal centering of a pallet fork, and the carrier platform has connecting and securing means for a detachable connection to a carrier platform holder.

[0010] The invention offers a significant advantage by combining a replaceable battery with a specially designed carrier platform, creating a modular system in which the replaceable battery can be operated both stationary and on a vehicle in different positions, thus allowing both the required battery capacity and the mounting location on the vehicle to be optimally adapted to the task to be performed by the vehicle.

[0011] The provision of a carrier platform for a replaceable battery according to the invention, on which the battery is arranged and, in particular, held, advantageously also allows these replaceable batteries to be placed at a charging station and used there as stationary energy storage devices when not needed in the vehicle. Thanks to the carrier platform, they can easily be reinstalled in the vehicle.

[0012] The support plate of the carrier platform according to the invention is preferably designed as a flat, plate-like body, which need not necessarily have a closed surface, but can also be designed as a grid structure or similar structure with openings, as long as it provides a flat surface for the typically also flat undersides of a battery. The holding device for a battery located on the upper side of the support plate facilitates and simplifies the positioning of a battery on the carrier platform, since it can be lifted off and lowered onto the support plate with less precision. The holding device is preferably designed as four cylindrical pins whose free ends point away from the upper side of the support plate. A permanent—but still detachable—connection between the battery and the carrier platform is preferred, so that they can always be moved together.

[0013] The guide device for pallet fork tines on the underside advantageously allows both penetration and / or re-engagement by a pallet fork tine, thus guiding it on the support platform and thereby securing it against displacement. The centering device of the guide device, as provided in the invention, ensures vertical and / or horizontal centering of a pallet fork relative to the support platform, thus providing even better protection against displacement. Finally, the connecting and securing means according to the invention for the detachable connection of the support platform to a support platform holder form the final point of a connection that secures the two against changes in their relative position: on the one hand, the interchangeable battery and the support platform on the one hand, and on the other hand, the support platform holder, which moves the battery via pallet tines.This secure connection is particularly important in mobile applications on a vehicle, as the exchangeable battery must not be displaced by shocks, vibrations, or changes in the vehicle's inclination—for example, on inclines, declines, or slopes. The carrier platform according to the invention thus enables the movement of an exchangeable battery using two-pronged pallet forks, such as those found on pallet trucks, forklifts, wheel loaders, and similar equipment. It also allows the exchangeable battery to be moved using a support platform holder, as described below.

[0014] In an embodiment of the invention, it is provided that the guide device has two or more aligned and spaced-apart distance and receiving sections, wherein the centering device is also arranged in at least one distance and receiving section and is preferably designed as two vertically oriented first centering plates spaced apart from each other, enclosing an angle between them and / or as a horizontally oriented second centering plate.

[0015] This design offers significant advantages in further developing the guiding mechanism. The two or more spacer and receiving sections arranged on the underside, separated by a gap, allow the pallet fork to be guided to the right and left of the spacer sections. These spacer sections can also accommodate a pallet fork or be traversed by it, as described below. Thus, the support platform already offers two ways in which it can interact with a pallet fork in one direction. A further interaction is enabled by the spacing, allowing a pallet fork to pass between two spacer and receiving sections and thereby interact with the support platform in a second direction, orthogonal to the first. This enables the exchangeable battery to be moved both longitudinally and laterally, which may be desirable for certain applications.The centering device aligns and guides the pallet fork, or at least one of its pallet fork tines, relative to the support platform to a secure, low-play fit against it.

[0016] In a further development of the invention, the connecting and securing means are designed orthogonally to a longitudinal axis of the spacer and receiving sections, in particular as through-openings oriented orthogonally to the longitudinal axis. These connecting means, which are also aligned orthogonally to a pallet fork, secure the support platform in a second axis and thus result in a particularly secure connection. The through-openings are secured against unintentional loosening, for example, by a spring pin, cotter pin, locking pin, or similar device.

[0017] If the holding device establishes a reversibly detachable connection between a battery and the support platform, in particular via positive locking means arranged on the top, preferably in the form of pins, then a secure connection between the replaceable battery and the support platform is established, without preventing the battery from being replaced with another.

[0018] In a further development of the invention, it is provided that it includes coupling elements for connecting to another carrier platform. This improved modularity increases flexibility, as two interchangeable batteries, each located on a carrier platform, can be moved simultaneously and positioned or exchanged on one of the aforementioned mobile work machines, such as a tractor, a telescopic handler, a Unimog, a slope tractor, and similar vehicles. In this way, an energy quantity adapted to the task to be performed by the vehicle can be provided without unnecessarily increasing its weight. This would be the case if a single, large battery were used instead of two smaller ones. The coupling elements are, in particular, mechanical, electromagnetic, pneumatic, or hydraulic to ensure a secure and stable connection between the carrier platforms.

[0019] In an embodiment of the invention, it is provided that the coupling elements have differently oriented coupling sub-elements, wherein first coupling sub-elements are aligned parallel to a longitudinal axis of the receiving sections and are in particular designed as pins, and in a further embodiment, that the coupling elements have second coupling sub-elements which are designed as elongated plates with through-openings, wherein first and second coupling sub-elements are designed to interact for connecting two support platforms.

[0020] This further development of the coupling (sub)elements with different but corresponding designs – in particular as positive and / or force-fit connections – connects both support platforms in two spatial directions, which in turn leads to a particularly secure connection between the two. A structurally simple and secure connection is made possible by the design of the invention, according to which the first coupling sub-elements are designed as pins and / or the second coupling sub-elements as through-openings in a longitudinal plate.

[0021] The problem is also solved by a carrier platform holder for holding a carrier platform of an exchangeable battery, in particular as described above, wherein the carrier platform holder has a base body to which two pallet fork tines are foldably attached, wherein the base body has a connecting device to a rear and / or front lifting device of a mobile working machine, which is in particular designed as a perforated plate system.

[0022] This carrier platform holder enables secure connection to both a front and a rear lifting mechanism of such a mobile work machine, which can thereby perform a battery change under its own power.

[0023] Further developing the carrier platform holder in such a way that the connecting device of the carrier platform holder has a connecting body that allows the carrier platform holder to be received in a shortened lifting device by means of the connecting body further increases its application possibilities.

[0024] If, in an embodiment of the invention, it has pallet fork tines that can be varied in their distance from one another, in particular several pallet fork tine holders spaced apart from one another, it can be converted from gripping one carrier body to gripping two coupled carrier bodies by simple and quick conversion.

[0025] The task is ultimately solved by a system consisting of a support platform and a support platform holder.

[0026] Finally, the invention also encompasses an electric-motor agricultural vehicle that is detachably connected to at least one carrier platform as described and / or has a carrier platform holder as described.

[0027] This electric vehicle preferably also features a permanently installed, lower-capacity battery – also known as an integrated battery – which serves as an energy storage device for battery swapping using the vehicle's own power. This also enables the vehicle to be used for lighter or shorter tasks where a spare battery is not required. However, according to the invention, the main energy source of the electric vehicle is at least one spare battery, which, as described, can advantageously be attached to the lifting mechanism at both the front and rear of the vehicle and connected there manually or automatically via cable.

[0028] Interchangeable batteries that can be used in the vehicle and for which the carrier platform is designed typically have a capacity of 30-40 kWh, which will increase to 100 kWh in the foreseeable future.

[0029] In addition to these tractor-type lifting mechanisms, the vehicle according to the invention has an inter-axle area that is also designed to accommodate a replaceable battery. It has surprisingly been found that the very limited installation space in the inter-axle area of ​​the vehicle is also suitable for accommodating a replaceable battery according to the invention. Therefore, it is advantageously provided that a vehicle according to further developments of the invention can have two replaceable batteries in the front or rear area, and additionally a third replaceable battery in the inter-axle area. This advantageously enables modularity and thus adaptability of the vehicle's energy supply to a wide variety of operating situations, in particular to more intensive and / or longer operations.

[0030] The invention is explained below with reference to the figures in a drawing, where identical components are identified by the same reference numerals. Specifically, the figures show: Fig. 1: in three views a) to c) an embodiment of the support platform, Fig. 2: in two views a), b) an embodiment of the receiving device, Fig. 3: in four views a) to d) two coupled support platforms, Fig. 4: in two views a), b) an embodiment of the carrier platform holder, Fig. 5: in two views a), b) two connected support platforms with support platform holders and Fig. 6: an embodiment of the connecting device of the carrier platform holder.

[0031] Fig. Figure 1 shows three partial views (a) to (c) of an embodiment of the support platform 1. A replaceable battery B, not belonging to the invention, is shown with dashed lines in each view. For the sake of clarity, not all identical components in this and the following figures are labeled with reference numerals in all (partial) figures, so that the overall picture of the embodiment can be derived from the figures as a whole.

[0032] The perspective partial view a) shows the support plate 2, as well as part of the guide device 5 and coupling elements 7. A battery base is penetrated by part of the holding device 6, as can also be seen in particular in Fig. c) can be seen, and is thus spatially fixed and held in a form-fitting manner on the support plate 2.

[0033] Partial view b) shows the three receiving sections 8-1, 8-2 and 8-3 in side view and their spacing from each other. The resulting through-openings 25 allow the two tines of a pallet fork to engage underneath the support platform 1 along this axis, which runs perpendicular to the longitudinal axis 14 of the support platform 1 (see Fig. 2b). Two of the four parts of the holding device 6 are also shown, as well as two damping elements 24. On the front side shown on the right, the first coupling sub-elements 12, which in this embodiment are pins 15, are shown, as well as connecting and locking elements 39, which here form a through-opening in a web projecting from the top 3. On the rear side of the support platform 1, shown on the left in sub-figure b), the foot part 26 and the first coupling sub-elements 7, 12, 15 are shown. The foot part 26, together with the underside of the guide device 5, or the undersides of the receiving sections 8-n, forms a stable bearing surface on a substrate.

[0034] The rear view of the support platform 1 shown in partial view c) depicts two parts of the holding device 6, each designed as a cylindrical body with two axial sections of different diameters. The resulting radial recess forms an annular bearing surface for a battery base and is designed such that it has a smaller distance to the surface 3 of the support plate 2 than the respective upper edge of the damping elements 24 in the unloaded state. Also shown are the damping elements 24 and two first coupling sub-elements 12, designed as pins 15, which are arranged on the base part 26 of the support platform 1. Finally, first and second centering plates 10, 11, which are described in more detail below, can be seen. Two battery guide plates 42, which guide and hold the battery laterally, are also visible.

[0035] This embodiment of the support platform 1 is made of metal, in particular simple structural steel, but can also be made of a higher alloy steel.

[0036] The shape of the support platform is chosen according to the shape of a replaceable battery to be carried; a square shape would therefore also be in accordance with the invention.

[0037] Fig. Figure 2 shows in two partial figures a), b) an embodiment of the guide device 5 in detail.

[0038] Partial figure a) shows a perspective view of the guide device 5 from above. This device is divided into three spacer and receiving sections 8-1, 8-2, and 8-3, which are spaced apart from one another, thus forming through-openings 25. A spacer and receiving section 8 of the guide device for the tines 21 of a pallet fork has centering plates 10, 11, which, in the case of the first centering plates 10, are spaced apart from one another and may also form an angle between them. These first centering plates 10 are attached to a wall 28 of the guide device 5, this wall 28 forming both a base and side walls of the guide device 5 and, in particular, being a stamped and bent part. By aligning themselves, a pair of the first centering plates 10 of a spacer and receiving section 8-n centers a tine 21 of a pallet fork inserted between them in the center of the guide device 5.In the central spacer and receiving section 8-2, a second centering plate 11 is arranged between and attached to two first centering plates 10. This provides vertical guidance for an inserted tine 21, directing it to the underside of the support plate 2 so that the tine comes to rest there. This is shown in particular in partial figure b). The guide device 5 has webs 27, of which only two are labeled for clarity. These webs 27 are also present on the centering plates 10 and 11, so that the entire guide device 5 is attached to the support plate 2 by means of these webs 27 through corresponding through-holes and weld points, or by inserting the separate centering plates 10 and 11 into the wall 28.

[0039] The guide device 5 can be engaged in a first, longitudinally parallel manner by two pallet fork tines on the right and left, or picked up between them, with the distance between the two pallet fork tines corresponding to the distance between the right and left sides of the guide device 5. It can be penetrated in a second, longitudinally parallel manner by a pallet fork tine if two support platforms are coupled and the second tine therefore penetrates the guide device of the second support platform. Finally, it can also be penetrated in a manner orthogonal to the longitudinal axis by two pallet fork tines, each of which passes through a passage opening 25 between two receiving sections 8-n. The width of the passage opening 25 is chosen to correspond to the wider pallet fork tines of a pallet truck.

[0040] The guide device 5 thus offers the significant advantage of allowing two different ways of receiving the support body 1 and a coupled, double support body: if only one support body 1 is to be received by a pallet fork, its tines 21 can, firstly, pass through the openings 25 and thus receive the support body 1 transversely. Secondly, they can receive it longitudinally by having the two tines 21 rest against the outwardly facing sides of the walls 28 of the guide device 5 and thus gripping them between themselves. This is shown in partial figure a) of Fig. 1 with reference numeral 21 for the two pallet fork tines. In the case of two coupled support platforms, the transverse loading is again carried out through the through-openings 25 and the longitudinal loading by a centered insertion of one tine 21 into one of the then duplicated guide devices 5.

[0041] Fig. Figure 3 shows such a coupling of two support platforms 1 in four sub-figures a) to d).

[0042] Figure a) shows the upper surface 3 of the support platform 1 with support plate 2 in a perspective view, coupled to a second identical support platform 1. Four parts of the holding device 6 are arranged on the upper surface 3 of a support plate 2, each of which penetrates a battery foot, thus spatially fixing and centering it on the support plate 2. The support plate 2 further has four damping elements 24 on which the battery B rests when the device is in use. These damping elements 24 dampen vibrations occurring during use due to their (rubber)-elastic properties. The coupling elements 7 already described are recognizable as the first coupling sub-elements 12, which are designed as pins 15 and are oriented in the direction of a longitudinal axis 14 of the receiving sections 8-n of the guide device 5.On the upper surface 3 of the support plate 2, further attachment points 31 of the three receiving sections 8-1, 8-2 and 8-3 can be seen (see also partial figure b) in top view).

[0043] The coupling is achieved through the interaction of the first coupling sub-elements 12 and the second coupling sub-elements 17. Two first coupling sub-elements 12, designed as pins 15, of a support platform 1 penetrate a second coupling sub-element 17, which has four through-holes 16 for this purpose and is itself designed as a long sheet metal strip. The two outer through-holes 16 are round holes and the two inner ones are elongated holes. The connection between the first and second coupling sub-elements is secured against unintentional loosening by securing each pin 15 with a cotter pin and having a corresponding through-hole for this purpose (see also [reference to be added]). Fig. c)

[0044] The two connecting and locking elements 39 are oriented orthogonally to the first and thus advantageously allow the (cotter pin) secured connection of the support platform 1 to a support platform holder, as described below. For this purpose, a foreign pin with a bore is provided, which passes through the through-opening of the connecting and locking element 39 as well as a corresponding opening in the support platform holder 19.

[0045] The support platforms are additionally connected to each other at the base by means of the first and second coupling sub-elements interacting securely as described. This is in Fig. d) shown. The foot section 26 is closed at the rear and positioned below the support plate 2. This creates a larger ground contact area and prevents unintentional contact of the tip of a tine.

[0046] Fig. Figure 4 shows in two partial figures a) and b) a support platform holder 19 according to the invention with two pallet fork tines 21.

[0047] Partial figure a) shows a perspective view of the carrier platform holder 19 with its hinged tines 21. This holder has a base body 20 to which the tines are hinged and attached. Here, the tines are attached to the base body 20 between two perforated plates 43 with minimal spacing between them. Due to the additional perforated plates 43 located further outwards, the distance between the two tines can be increased by attaching them between these further outwards perforated plates 43. The base body 20 also has a connection device 22 for a rear and / or front linkage of a tractor, which is designed here as a two-part three-point adapter plate 29a, 29b, each forming a perforated plate system 23.Depending on whether the carrier platform holder 19 is to be mounted in a standardized tractor three-point linkage or not, it is either attached to the adapter plate 29a inserted into and secured to the adapter plate 29b, or directly to the adapter plate 29b. In the latter case, the adapter plate 29a is removed. The latter case requires special lower links and results in the carrier platform holder 19 being positioned closer to the tractor. The two outer walls of the base body 20 can be fitted with... Fig. The coupling plates 30 shown in the illustration are screwed on, projecting towards the support platform 1 and serving for the described connection with the connecting and securing means 39.

[0048] This connection situation is in Fig. Figure 5 shows the system in perspective and side view in two partial figures a) and b), depicting a carrier plate holder 19 and two coupled carrier platforms 1. The two tines 21 of the pallet fork are each centered and guided in the guide device 5. Each coupling plate 30 has through-holes whose position is coaxial with the through-hole 16 of the connecting and locking means 39 and which are secured by a cotter pin when connected.

[0049] Fig.Figure 6 shows the design of the carrier platform holder 19, which allows it to be mounted closer to a vehicle than is usual in a conventional tractor three-point linkage. The tractor three-point linkage 33 has a top link 34 attached to the lifting arm and two lower links 36, the relative distance of which to the top link 34 can be changed by means of a lifting cylinder 37. In an embodiment of the carrier platform holder 19 according to the invention, it now has two connecting bodies 32, which are designed as lower links 35 of the carrier platform holder 19 and are connected to it at one end. The other end is attached to the respective lower link 36 of the three-point linkage 33. In this embodiment, the top link 34 is directly received in the three-point adapter plate 29b.

[0050] The carrier platform according to the invention is designed so that it can be easily coupled to a second platform without the need for tools and can be picked up individually or coupled by pallet forks via its mounting device in different axes, thereby securely and tool-free holding a spare battery. The carrier platform provides protection for the battery during transport and use on the vehicle and enables a robust connection between the agricultural vehicle and the respective spare battery. Coupling and uncoupling from the vehicle is simplified.

[0051] The system according to the invention, consisting of at least one carrier platform and a carrier platform holder, simplifies coupling and uncoupling to the vehicle. REFERENCE MARK LIST 1 carrier platform 2 support plate 3 Top 4 Underside 5 Guide device 6 Holding device 7 coupling element 8 Distance and recording section 9 Centering device 10 first centering plates 11 second centering plate 12 first coupling sub-elements 13 14 Longitudinal axis 15 cones 16 Passage opening 17 Second coupling sub-elements 18 long sheets with through openings 19 carrier platform holders 20 basic shapes 21 pallet forks 22 Connection device 23 Perforated Panel System 24 damping element 25 Through opening 26 Foot section 27 Bridge 28 wall 29 Three-point adapter plate 30 coupling plate 31 Mounting point 32 connecting bodies 33 three-point holders 34 Top link 35 Lower link carrier platform holders 36 lower links three-point linkage 37 lifting cylinders 38 space 39 Fasteners and securing devices 40 pallet fork tine holders 41 Form-fitting devices 42 battery guide plates

Claims

[1] Carrier platform (1) of a battery exchange system comprising a support plate (2) with a top (3) and a bottom (4), wherein the bottom (4) has a guide device (5) for pallet fork tines (21), wherein the top (3) has a holding device (6) for a battery, wherein the guide device (5) enables penetration and / or gripping by a pallet fork tine (21), wherein the guide device (5) has a centering device (9) for pallet fork tines (21) which effects a vertical and / or horizontal centering of a pallet fork, and wherein the carrier platform (1) has connecting and securing means (39) for detachable connection with a carrier platform holder (19). [2] Carrier platform (1) according to claim 1 characterized by, that the guide device (5) has two or more aligned and spaced apart from each other by a gap (38), wherein the centering device (9) is also arranged in at least one spaced and spaced section (8) and is preferably designed as two vertically oriented first centering plates (10) spaced apart from each other, enclosing an angle between each other and / or as a horizontally oriented second centering plate (11). [3] Carrier platform (1) according to claim 1 or 2, characterized by , that the connecting and securing means (39) are designed orthogonally to a longitudinal axis (13) of the distance and receiving sections (8), in particular as through openings (16) oriented orthogonally to the longitudinal axis (13). [4] Carrier platform (1) according to claim 1, 2 or 3, characterized bythat the holding device (6) establishes a reversibly detachable connection between a battery and the carrier platform (1), in particular via positive locking means (41) arranged on the top (3), preferably in the form of pins (15). [5] Carrier platform (1) according to any one of the preceding claims, characterized by , that it has coupling elements (7) for coupling with another support platform (1). [6] Carrier platform (1) according to any of the preceding claims, characterized by , that the coupling elements (7) have differently oriented coupling sub-elements, wherein first coupling sub-elements (12) are aligned parallel to a longitudinal axis (14) of the receiving sections (8) and are in particular designed as pins (15). [7] Carrier platform (1) according to claim 5 or 6, characterized by, that the coupling elements (7) have second coupling sub-elements (17) which are designed as elongated plates with through openings (18), wherein the first and second coupling sub-elements (12, 17) are designed to interact for connecting two support platforms (1). [8] Carrier platform holder (19) for holding a carrier platform (1) of a spare battery, in particular according to one of the preceding claims, wherein the carrier platform holder (19) has a base body (20) to which two pallet fork tines (21) are hingedly attached, wherein the base body (20) has a connecting device (22) to a rear and / or front lifting device of a mobile working machine, which is in particular designed as a perforated plate system (23). [9] Carrier platform holder (19) Claim 8, characterized by, that the connecting device (22) of the carrier platform holder (19) has a connecting body (32) such that the carrier platform holder (19) can be received in a shortened lifting device by means of the connecting body (32). [10] Carrier platform holder (19) according to claim 8 or 9, characterized by that it has pallet fork tines (21) that can be varied in their distance from each other, in particular several pallet fork tine holders (40) spaced apart from each other. [11] System comprising at least one support platform (1) and a support platform holder (19) according to one of the preceding claims. [12] Electric agricultural vehicle, characterized by that it is detachably connected to at least one support platform (1) according to one of claims 1 to 7 and / or it has a support platform holder (19) according to one of claims 8-10.

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