Mobile work machine with an electrical energy storage system

Abstract

A mobile working machine (1) with a vehicle frame (3) and with a drive unit for driving at least one drive element (5) is proposed, wherein the drive unit comprises at least one electric motor (7) and at least one electrical energy storage device (4) for storing drive energy for the electric motor (7), wherein at least one tool holding device (6) is provided for holding a working tool, wherein the energy storage device (4) has at least one storage housing (9) and several electrochemical battery cells (14), wherein the battery cells (14) are arranged inside the storage housing (9), whereby at least some of the disadvantages of the prior art are improved or avoided, in particular thermal or cooling improvements and / or improvements to the center of gravity distribution and / or new or novel freedoms in the electrification of the machines.According to the invention, this is achieved by arranging the energy storage device (4) and / or the battery cells (14) and / or the storage housing (9) at least partially below at least one longitudinal member of the vehicle frame (3) when viewed in a vertical direction and / or laterally next to the at least one longitudinal member of the vehicle frame (3) when viewed in a horizontal direction.

Description

[0001] The invention relates to a mobile work machine, in particular a wheel loader, telescopic loader, excavator, dumper, soil compaction device such as a vibratory rammer, a vibrating plate or a roller, or the like, with an electrical energy storage device and a method for operating such a mobile work machine according to claims 1 and 18. State of the art

[0002] Mobile work machines, in particular wheel loaders, telescopic loaders, excavators, dumpers or the like, with a vehicle frame and with a drive unit for driving at least one drive element such as a running wheel or track, are already commercially available in a wide variety of variants. With the exception of wheel loaders with large buckets on the lifting arm, for example, modern, mobile work machines often have detachably connectable work tools, e.g., which are held or released using so-called "quick couplers" or "interchangeable plates". In addition to "passive" work tools such as shovels, bale forks or the like, there are also work tools such as brooms, mulchers, gripper arms, grab buckets, lifting forks or the like, which accordingly have an "active" or energy-driven tool.

[0003] In addition, dump trucks are also commonly used as work machines that feature a tilting trough as a working tool. The tilting trough can be designed either as a skip, which can be picked up or lowered onto the ground using the construction vehicle's pivoting / tilting lever arms, or as a semi-trailer, which can usually be raised or tilted for unloading using hydraulic cylinders.

[0004] Diesel-powered vehicles are still predominantly in use today. Electric vehicles are also now in use (see DE 20 2014 000 738 U1). For the sake of simplicity, these vehicles generally simply replace the combustion engine with an electric motor and the necessary battery or electrical energy storage system with numerous electrochemical battery cells. The battery is located in the same place as the combustion engine, meaning the potential of the innovative electric drive system is not optimally utilized. Object and advantages of the invention

[0005] The object of the invention is, in contrast, to propose a mobile construction machine or a method, wherein the disadvantages of the prior art are at least partially improved or avoided, in particular thermal or cooling technology and / or process or cost improvements and / or to improve the center of gravity distribution and / or to realize new or novel freedoms in the electrification of the machines.

[0006] This object is achieved by the features of claims 1 and 18. Advantageous embodiments and further developments of the invention are possible by the measures mentioned in the subclaims.

[0007] Accordingly, for example, a work machine according to the invention is characterized in that the energy storage device and / or the battery cells and / or the storage housing is / are arranged at least partially below the at least one longitudinal member of the vehicle frame when viewed in the vertical direction and / or laterally next to the at least one longitudinal member of the vehicle frame when viewed in the horizontal direction.

[0008] This measure enables optimization of the center of gravity and improved assembly and / or disassembly of the energy storage system and / or the battery cells and / or the storage housing. It also enables more flexible and independent dimensioning and placement of the energy storage system and / or the battery cells and / or the storage housing or the energy storage system with respect to the vehicle frame or the longitudinal member(s), as well as their interchangeability. This can reduce costs and effort, as well as improve their cooling and / or coolability.

[0009] Advantageously, the energy storage device and / or the battery cells and / or the storage housing are arranged at least partially below the first and / or second axis of rotation. Alternatively, or in combination with this, the energy storage device and / or the battery cells and / or the storage housing can be arranged entirely below the vehicle frame and / or the at least one longitudinal member. This allows for a particularly low arrangement and thus a particularly advantageous center of gravity.

[0010] In an advantageous variant of the invention, the energy storage device and / or the battery cells and / or the storage housing are arranged entirely below a rotational axis plane / surface, wherein the rotational axis plane / surface is formed by the first and second rotational axes and / or by the rotational axes or center points of at least the first drive element and the second drive element or the impeller, wherein, in particular, a first drive element and a second drive element or an impeller are arranged on a right and a left side of the travel / longitudinal direction. This means that the energy storage device is arranged very low down, thus achieving a particularly low center of gravity and good accessibility for maintenance, service, or replacement, etc.

[0011] In an advantageous variant of the invention, the energy storage device and / or the battery cells and / or the storage housing are arranged between a vehicle shell, in particular a battery tray and / or mounting tray, and the at least one longitudinal member of the vehicle frame. The vehicle shell or battery tray and / or mounting tray can advantageously protect the energy storage device or the storage housing, in particular against mechanical damage and / or dirt, dust, splash water, theft, or the like.

[0012] For example, at least one sealing unit is arranged between the vehicle frame or vehicle frame element and the vehicle shell to seal / protect the energy storage device and / or storage housing. This seal further improves protection against dirt, splash water, or the like.

[0013] In a particular development of the invention, the energy storage device and / or the battery cells and / or the storage housing are arranged, viewed in the travel / longitudinal direction, between the first and second rotational axes and / or between the first drive element and the second drive element or the impeller. This measure enables lateral handling or lateral access for maintenance, repair, service, replacement, etc. between the drive elements, impellers or rollers, etc., thus improving operation for personnel.

[0014] Advantageously, the energy storage unit and / or the storage housing are designed as interchangeable modules for detachable, fixable replacement. This allows for the quick and easy replacement and replacement of a damaged or empty energy storage unit with a new, undamaged, repaired, and / or full energy storage unit. This improves the operational capability of the mobile machine.

[0015] In an advantageous embodiment of the invention, the assembly and / or disassembly directions of the interchangeable module are oriented vertically. Advantageously, at least one vertical lifting unit is provided for vertically raising and / or lowering the energy storage device and / or the storage housing and / or the interchangeable module, at least for the assembly and / or disassembly of the interchangeable module. This allows even a very large or heavy energy storage device to be replaced or exchanged without significant effort on the part of the personnel.

[0016] Advantageously, the battery cells are arranged on a common plane within the storage housing, with the battery cells forming, in particular, a single-layer battery pack. This preferably single-layer battery pack allows for the realization of a flat, large-area, single-layer energy storage device. For example, in cylindrical cells, pouch cells, or prismatic cells, etc., only a single layer of electrochemical cells, possibly arranged edgewise, is used / provided.

[0017] This not only allows the center of gravity of the machine to be optimized or relocated relatively low, but also allows for optimization or improvement of cooling and thermal management. The comparatively large surface area, particularly of the upper and lower housing walls of the storage enclosure, improves cooling and heat dissipation of the energy storage unit and battery cells without great effort. This is advantageous not only during operation, but also during electrical charging of the storage unit.

[0018] According to the invention, the energy storage unit or the battery or the accumulator is designed to be as flat as possible. Advantageously, this means that on the one hand the overall height of the machine does not have to be increased and / or on the other hand the ground clearance of the machine does not have to be restricted. In addition, the installation space that was previously used for the combustion engine or the electrical energy storage unit can be used for other components. This results in new freedoms with regard to the arrangement and positioning of other components, e.g. the hydraulic pump, the air conditioning system or the cooling unit, the driver's cab and / or the lifting arms, especially in telehandlers, etc. This new arrangement of the sometimes very heavy components can be used, among other things, to optimize or improve the vehicle's center of gravity. For example, the positioning and / or the center of gravity can be adjusted both longitudinally, i.e. front-rear, and / or transversely, i.e.left-right, can be realized or optimized in a completely new way.

[0019] Advantageously, the energy storage unit or battery pack is no longer placed in the rear and / or side part of the machine as in the state of the art, but as low as possible, i.e. as low as seen in the vertical direction.

[0020] For example, the energy storage unit is positioned between the front and rear axles.

[0021] If necessary, a cardan shaft can be omitted or made unnecessary, in which case the drive motor(s) are advantageously arranged / installed directly, e.g. with or without an intermediate gear, on the axles / drive elements / wheels or on their differential. The space saved by omitting the previous cardan shafts can be used to accommodate one or more energy storage units or storage housings. For example, a single, flat, continuous energy storage unit or battery is used. The energy storage unit or battery can, for example, extend between the front and rear axles across the surface of the frame and / or beyond. Especially with all-wheel steered machines, almost the area created / spanned between the (four) wheels can be used.

[0022] In a particular development of the invention, the battery pack comprises several identically designed battery modules, each with a separate module housing. This allows comparatively large quantities of battery modules to be produced. This is particularly cost-effective and also improves the flexibility of the arrangement of the entire energy storage unit or the traction battery of the vehicle. For example, in a mobile work machine with articulated steering and a so-called front and rear carriage, at least one battery module can be provided / arranged in the front carriage and one battery module in the rear carriage. This allows particularly advantageous electrical cabling to the drive motors to be implemented. This means that an electrical connection between the front and rear carriages can be omitted. This also improves operational reliability and the service life.

[0023] In an advantageous variant of the invention, the energy storage device and / or the storage housing has at least one support frame for supporting / stiffening the energy storage device. This allows for the flattest possible design while simultaneously ensuring high stability and / or rigidity of the energy storage device or the storage housing.

[0024] Advantageously, at least one support frame device for supporting / stiffening the energy storage device is provided at least between the battery cells and / or between the battery modules and / or within the single-layer battery pack. This allows for a particularly rigid and stable, yet space-saving construction.

[0025] For example, the support frame and / or the support frame device comprises at least one first support frame element aligned in the longitudinal direction of the energy storage device and / or a second support frame element aligned transversely / perpendicularly to the longitudinal direction of the energy storage device. This measure further improves the stability and rigidity of the energy storage device or storage housing, while simultaneously requiring relatively little installation space. For example, the cells and / or modules are advantageously protected in a structure constructed by longitudinal and transverse struts.

[0026] Advantageously, the height of the energy storage device is a maximum of twice the height of the battery cells and / or the battery pack and / or the battery module. This means that the storage housing, or the upper and lower housing walls, and any thermal and / or electrical insulation layer within the storage housing, are comparatively thin or low. With this low overall height or the height of the energy storage device, the aforementioned advantages can be realized in a particularly advantageous way.

[0027] Advantageously, the energy storage device and / or the storage housing comprises at least one battery cooling unit, in particular a liquid cooling unit, for cooling the battery cells. The particularly flat design of the energy storage device according to the invention enables advantageous air cooling, in particular by means of atmospheric air or the airstream. However, liquid cooling is also highly advantageous, allowing particularly large amounts of heat to be dissipated. Furthermore, the battery cooling unit can be used for heating purposes, e.g., in the driver's cab, etc.

[0028] For example, the battery cooling unit is located between the storage enclosure and the battery cells / battery modules or battery packs. This has been shown to enable particularly efficient and / or space-saving cooling.

[0029] Advantageously, at least one decoupling unit is provided for damping and / or mechanically decoupling the battery cells / battery modules and / or the battery pack from the vehicle frame, wherein the decoupling unit is arranged, in particular, on / in the energy storage device and / or within the storage housing. This can improve the service life of the energy storage device.

[0030] For example, the control unit is (also) located within the energy storage device and / or storage housing. This allows it to be advantageously positioned and / or cooled and / or damped. This improves the service life and reduces the required installation space.

[0031] For example, the drive unit comprises at least one hydrostatic drive motor driven by the electric motor for driving the drive wheel and / or the tool holder. The drive motor or electric motor drives at least one hydraulic pump, which in turn drives a hydraulic motor. The hydraulic motor is typically mounted on a transfer case, from which the axles or the individual drive elements / wheels are driven, possibly via one or more cardan shafts. As already explained above, the use of cardan shafts can be omitted, thus resulting in novel drive or structural arrangements. A hydraulic drive of the lifting arm or the support device for the tool holder is particularly advantageous.

[0032] In general, the use of a flat energy storage unit or a flat battery, especially on the underside of the body or frame, has several advantages and / or additional features that can be implemented individually or in combination: The cooling of the battery is improved by the larger surface, the center of gravity of the machine is positively influenced - lower center of gravity = better stability, Even weight distribution front / rear - right / left, which could lead to major problems with weight distribution and thus stability, especially on machines where the energy storage unit / battery cannot be installed centrally to the machine's longitudinal axis, e.g. telehandlers or excavators, depending on the battery size and weight.

[0033] The energy storage unit or battery pack can be attached to the frame in various ways: The energy storage unit or battery pack is preferably attached from below to a self-supporting frame of the work machine. For this purpose, the energy storage unit or battery pack can be advantageously pre-assembled in a tray-like configuration, so that the tray only needs to be secured from below. The tray-like design has the additional advantage of mechanically protecting the energy storage unit or battery, especially when using a suitable liquid seal.

[0034] Alternatively, the energy storage unit or battery pack can be mounted elsewhere on the frame and later covered with a plate or similar. For this purpose, a subframe can be attached to the frame, into which the energy storage unit or battery pack is then inserted.

[0035] These types of designs can be used for both articulated and all-wheel-steered machines. Articulated machines in this case would be wheel loaders, dumpers, and rollers. All-wheel-steered machines would include wheel loaders, telehandlers, or wheel / mobile excavators.

[0036] The advantage here is that as few significant mechanical loads as possible, such as torsional forces, are transferred from the frame to the energy storage unit or battery pack. Decoupling between the frame and the energy storage unit or battery cells is therefore a great advantage. This can be achieved by eliminating direct connection of the batteries to the frame and by using additional damping elements, such as rubber buffers, silent blocks, etc.

[0037] Various options are also conceivable for cooling the energy storage unit or battery pack. Liquid cooling can be provided, with the heat from the cells being dissipated via the liquid. Preferably, liquid lines run underneath the cells. Alternatively or additionally, any heat generated can also be dissipated to surrounding components, e.g., the frame or a section of the tray or base plate.

[0038] Advantageously, electrical components can be located near the energy storage device or battery pack. A separate electrical unit or box can be used for this purpose, in which various components can be housed. This allows the electrical unit / box to be designed as a module and advantageously integrated into the machine. Components that could be located in the electrical unit / box include the battery management system (BMS), the inverter(s), a connection box, power distributors, contactors, and charging modules, etc., with the connection box advantageously bundling various cables.

[0039] By positioning the battery or energy storage unit below the frame, the space that previously served as the engine compartment is now free. For example, in the case of wheel loaders, this means the space behind the cabin, or in the case of telehandlers, opposite the cabin. It is therefore advisable to use this space for other elements. For example, an air conditioning compressor, a heat pump or generally elements for air conditioning the cabin or for air conditioning the energy storage unit / battery can be arranged there. A charging module, etc. could also be placed there. It would also be conceivable to arrange an additional or second energy storage unit / battery there, e.g. an on-board network battery or a second traction battery within the meaning of the invention. Furthermore, parts of the hydraulics could also be arranged there, such as an electric motor with the hydraulic pump for the work functions.In the event of a service call, all of these components are now easier to access and are no longer obstructed by the energy storage unit / battery.

[0040] Since many electrical components are arranged in this installation space, it may be advisable to arrange the electrical box below it so that the paths for connecting the components are as short as possible.

[0041] In principle, several energy storage units or battery packs can also be advantageously placed at different locations, e.g. in the case of articulated work machines at the front and also at the rear, or generally in the case of work machines according to the invention at different positions on the frame, for example in the spaces between the wheels, below and / or next to the respective chassis or the longitudinal members of the front and / or rear vehicle, etc.

[0042] To achieve an advantageous center of gravity and maximize space, the energy storage unit or the accumulator or battery cells can be arranged below the frame. The chassis can, for example, be formed by two longitudinal beams / supports extending from the first to the second axle. In particular, the accumulator or battery cells can be intersected by a plane spanned by the four centers of the wheel hubs or drive elements / wheels.

[0043] Other advantageous features can be of great benefit individually or in combination, that - the energy storage unit or the accumulator or battery cells are mounted from below, whereby the energy storage unit or the accumulator or battery cells can be lowered downwards or raised vertically, for example by means of a lifting table or the like, - the fixing, in particular screwing, of the energy storage unit or the accumulator or battery cells and / or the storage housing can be done from above or below, - the dimensions of the energy storage unit or the accumulator or battery cells can be shorter in the longitudinal direction than the wheelbase or shorter than the space between the mounted tires, so that the energy storage unit or the accumulator or battery cells can be removed from the side, - the energy storage unit or the accumulator or battery cells can be designed to be wider in the transverse direction than the chassis frame, so that at least the two longitudinal beams and spars are spanned in the transverse direction, - with regard to advantageous fluid cooling, a fluid pump can be arranged outside the energy storage device and / or the storage housing, - for example, the pump for the cooling can be arranged in the “previous” engine compartment, especially on the left or right, - an advantageous expansion tank of the cooling and / or hydraulic system can also be arranged outside the energy storage unit and / or the storage housing, preferably elevated relative to the latter and the pump, - Refill / read option should be available, - Cables / water pipes for cooling can be advantageously routed from above, - Fluid cooling can cool not only the energy storage unit or the battery cells and / or the storage housing, but also other components, such as an inverter, charger, the drive motor and / or other electric motors for work and driving operation. - in general, the energy storage and / or the accumulator or battery cells and / or the storage housing under the machine should be designed as tightly as possible, - advantageously, a distance can be provided between the accumulator or battery cells and the storage housing and / or an underbody protection, whereby, for example, a minimum distance between a floor plate and the accumulator or battery cells advantageously forms a safety space between the floor plate and the accumulator or battery cells. - advantageously, the energy storage device and / or the accumulator or battery cells and / or the storage housing are arranged below the frame or on or below the axle center or wheel center, e.g. of the front and rear axle, or below a plane spanned by the four centers of the four wheels or drive elements, - advantageously at least 50% of the cells are cut from this plane, - a weight balance as balanced as possible left / right.

[0044] In addition, other advantageous features or advantages can be realized individually or in combination with each other, such as - upgradeable modules, - several energy storage units / battery packs connected and / or placed / arranged in series or parallel, especially of the same or different sizes, - defective individual modules can be replaced, - inductive charging technology, - Exchangeable battery system, especially in combination with the above-mentioned tray or with “exchangeable trays”, - the energy storage / battery pack does not necessarily have to be installed centrally to the longitudinal axis, although an off-center position can also be chosen for better balancing, e.g. especially with telescopic loaders or the like. - Improvement of weight distribution and stability, - more efficient use of drive power, - longer usage time with one battery charge, - less machine weight due to optimized center of gravity and thus no need for counterweights, - Machine transport on small trailers up to a maximum total load of 3500kg, - better cooling of the battery even without active cooling, - Distribution of the machine in warmer geographical regions, - Accessibility of all maintenance-intensive components, - Potential equalization measurement and / or - Insulation measurement Example

[0045] An embodiment of the invention is shown in the drawing and is explained in more detail below with reference to the figures.

[0046] In detail: Fig. 1 a schematic view of a first mobile work machine with driver's cab, vehicle frame and energy storage according to the invention, Fig. 2 a schematic, perspective view of a vehicle frame of a second mobile work machine according to the invention, without a driver's cab and Fig. 3 a schematic view from below of the vehicle frame with energy storage of a third mobile work machine according to the invention.

[0047] The figures schematically depict a mobile work machine 1 with a driver's cab 2, a vehicle frame 3 with two longitudinal beams 21, 22, and an energy storage unit 4 or a traction battery 4 in the form of a so-called telescopic loader with a telescopic arm 6 and four steerable wheels 5, i.e., with all-wheel steering. The energy storage unit 4 or the traction battery 4 supplies two electric motors 7, each of which drives the wheels 5 via a transmission gear 8.

[0048] Merely symbolic is Fig. 2 depicts a hydraulic pump or hydraulic system 10 to demonstrate that, for example, the telescopic arm 6 can be adjusted, raised, and extended / retracted using hydraulic energy. However, such hydraulic systems are generally known.

[0049] The energy storage device 4 or a storage housing 9 is in the variant according to Fig. 1 and Fig. 2 is arranged or fixed at the bottom of or below the supporting frame 3, whereby, for example, a plate 11 is fixed below the housing 9 or energy storage unit 4 to the vehicle frame 3, in particular releasably fixed, e.g., by means of screws. Advantageously, a mechanical decoupling or damping device is provided to dampen the energy storage unit 4 or the traction battery 4, which can cushion / damp vibrations. At the same time, this also serves as protection against dirt and water.

[0050] Fig. 1 also illustrates, among other things, how the energy storage device 4 or the accumulator or battery cells 14 are arranged below a plane E which is spanned by the front and rear axles or four centers of the four wheels 5 or drive elements 5, wherein advantageously at least 50% of the cells 14 or the energy storage device 4 should be intersected by this plane E.

[0051] In the variant according to Fig. 2, the storage housing 9 is arranged or fixed laterally next to or on the support frame 3, i.e., on the so-called "right side." Without further illustration, an additional or second energy storage unit 4 and / or other relatively heavy components can also be provided on the so-called "left side" for weight compensation.

[0052] The energy storage device 4 or the traction battery 4 further comprises an inverter and / or an electronic unit 12 or a so-called battery management system (BMS), which is provided for controlling the discharge and charging of the energy storage device 4 or the traction battery 4.

[0053] The energy storage device 4 or the traction battery 4 has numerous battery cells 14 (see in Fig. 1 and Fig. 3), which are arranged within two battery modules 13 in the present embodiment. The battery cells 14 are all arranged on a common plane 15 within the housing 9 or energy storage device 4. A liquid cooling system 16 is provided below the cells 14 and above or within the housing 9.

[0054] In addition, a charger or charging unit, an air conditioning compressor, one or more DC / AC converters 17 and / or an inverter, etc. may also be present within the housing 9 or the energy storage device 4 or the traction battery 4. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 20 2014 000 738 U1

[0004]

Claims

[1] Mobile work machine (1), in particular wheel loader, telescopic loader, excavator, dumper, tractor or the like, with a vehicle frame and with a drive unit for driving at least one first drive element (5), e.g. drive wheel / roller and / or crawler track or vibration element, and / or a work tool, e.g. grab / shovel, fork, vibration element, milling machine, dozer blade, trough or the like, wherein the drive unit has at least a first and a second axis of rotation, between which a distance is provided, wherein the first drive element (5) is arranged on the first axis of rotation and at least one second drive element (5) or a running wheel is arranged on the second axis of rotation, wherein the drive unit has at least one electric motor (7) and at least one electrical energy store (4), in particularan electric traction battery (4) for storing drive energy for the electric motor (7), wherein at least one tool holding device (6) is provided for holding a work tool, wherein in particular the tool holding device comprises at least one support device pivotable about a pivot axis, e.g.Lifting arm and / or telescopic boom and / or three-point lifting device, wherein the vehicle frame has at least one, in particular two, longitudinal members (21, 22) aligned in the direction of travel / longitudinal direction, wherein the at least one longitudinal member (21, 22) extends at least between the first and the second axis of rotation, wherein a control unit (12) is provided for the electrical and / or electronic control of the electric motor (7) and / or the energy storage device (4), wherein the energy storage device (4) has at least one storage housing (9) and a plurality of electrochemical battery cells (14), wherein the battery cells (14) are arranged within the storage housing (9), wherein the battery cells (14) are arranged within the storage housing (9) on a common plane (15) and in particular form a single-layer battery pack. characterized bythat the energy store (4) and / or the battery cells (14) and / or the storage housing (9) is / are arranged at least partially below the at least one longitudinal member (21, 22) of the vehicle frame (3) when viewed in the vertical direction and / or laterally next to the at least one longitudinal member (21, 22) of the vehicle frame (3) when viewed in the horizontal direction. [2] Mobile work machine according to claim 1, characterized by that the energy store (4) and / or the battery cells (14) and / or the storage housing (9) is arranged at least partially below the first and / or second axis of rotation. [3] Mobile work machine according to one of the preceding claims, characterized by that the energy store (4) and / or the battery cells (14) and / or the storage housing (9) is arranged completely below the vehicle frame (3) and / or the at least one longitudinal member (21, 22). [4] Mobile work machine according to one of the preceding claims, characterized by in that the energy store (4) and / or the battery cells (14) and / or the storage housing (9) is arranged completely below a rotation axis plane / surface, wherein the rotation axis plane / surface is formed by the first and the second rotation axis and / or by the rotation axes or centers of at least the first drive element (5) and the second drive element (5) or the impeller, wherein in particular a first drive element (5) and a second drive element (5) or an impeller are arranged on a right and a left side of the travel / longitudinal direction. [5] Mobile work machine according to one of the preceding claims, characterized bythat the energy store (4) and / or the battery cells (14) and / or the storage housing (9) is arranged between a vehicle shell (11), in particular a battery tray and / or mounting tray, and the at least one longitudinal member (21, 22) of the vehicle frame (3). [6] Mobile work machine according to one of the preceding claims, characterized by that the energy store (4) and / or the battery cells (14) and / or the storage housing (9) is arranged between the first and the second axis of rotation and / or between the first drive element (5) and the second drive element (5) or the impeller, viewed in the direction of travel / longitudinal direction. [7] Mobile work machine according to one of the preceding claims, characterized by that the energy store (4) and / or the storage housing (9) is designed as an interchangeable module for detachably fixable replacement / exchange, wherein in particular a mounting direction and a dismounting direction of the interchangeable module are provided. [8] Mobile work machine according to one of the preceding claims, characterized by that the mounting direction and / or the dismounting direction of the interchangeable module are aligned in the vertical direction. [9] Mobile work machine according to one of the preceding claims, characterized by that at least one sealing unit for sealing / protecting the energy store (4) and / or storage housing (9) is arranged between the vehicle frame or the at least one longitudinal member (21, 22) and the vehicle shell (11). [10] Mobile work machine according to one of the preceding claims, characterized by that the energy storage device (4) and / or the storage housing (9) has at least one support frame for supporting / stiffening the energy storage device (4), [11] Mobile work machine according to one of the preceding claims, characterized by that the battery pack comprises several identically designed battery modules (13), each with a separate module housing. [12] Mobile work machine according to one of the preceding claims, characterized by that at least one support frame device for supporting / stiffening the energy storage device (4) is provided at least between the battery cells (14) and / or between the battery modules (13) and / or within the single-layer battery pack. [13] Mobile work machine according to one of the preceding claims, characterized by that the support frame and / or the support frame device comprises at least one first support frame element aligned in the longitudinal direction of the energy storage device (4) and / or a second support frame element aligned transversely / perpendicularly to the longitudinal direction of the energy storage device (4). [14] Mobile work machine according to one of the preceding claims, characterized bythat the energy store (4) and / or the storage housing (9) has at least one battery cooling unit (16), in particular a liquid cooling unit, for cooling the battery cells (14) and that in particular the battery cooling unit (16) is arranged between the storage housing (9) and the battery cells (14) and / or battery modules / battery packs. [15] Mobile work machine according to one of the preceding claims, characterized by that at least one decoupling unit is provided for damping and / or mechanically decoupling the battery cells / battery modules and / or the battery pack from the vehicle frame (3) and that in particular the decoupling unit is arranged on / in the energy store (4) and / or within the store housing (9). [16] Mobile work machine according to one of the preceding claims, characterized by that the control unit (12) is arranged within the energy storage device (4) and / or storage housing (9). [17] Mobile work machine according to one of the preceding claims, characterized by that the drive unit comprises at least one hydrostatic drive motor (10) driven by the electric motor (7) for driving the drive wheel (5) and / or the tool holding device (6). [18] Method for operating a mobile work machine according to one of the preceding claims, characterized by that the energy store (4) and / or the storage housing (9) is designed as an interchangeable module for detachably fixable replacement / exchange, wherein assembly and / or disassembly of the interchangeable module is provided in the vertical direction. [19] Method according to the above-mentioned claim, characterized by that at least one vertical lifting unit for vertically lifting and / or lowering the energy storage device (4) and / or the storage housing (9) and / or the interchangeable module is used at least for assembly and / or disassembly of the interchangeable module.

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