Energy storage device for a motor vehicle

Abstract

The invention relates to an electrical storage device (10) for a motor vehicle. Each of the plurality of battery module groups (14) is provided with a plurality of battery modules (20), and each of the plurality of battery modules is composed of a plurality of single batteries. A plurality of containers (12) are stacked and each have a substantially frame-shaped container outer wall (18), one of the plurality of battery module groups (14) being arranged in each case in one of the plurality of containers (12). A plurality of fixing elements (16), which are elongated, respectively extend through the container outer walls (18) of a plurality of containers (12) and fix the containers (12) to each other. Advantageously, long fastening elements (16) passing through all the containers (12) enable a modular, freely expandable design of the energy store (10) and have the characteristics of free geometry, light weight, low cost and simple and fast assembly and disassembly.

Description

Technical Field

[0001] The invention relates to an electric storage device for a motor vehicle and a motor vehicle having an electric storage device. Background Art

[0002] Storage batteries for motor vehicles are sufficiently known from the prior art. WO 2006 / 043163 A1 discloses, for example, a battery module which forms a unit for assembling a battery package, which comprises a battery cell having a plurality of batteries and a housing and a cover for receiving the battery cell. The battery module further comprises an axis element which is inserted into a through hole provided in the battery cell and a through hole provided in the housing and a through hole provided in the cover. The axis element has a length which allows it to extend not only from the housing but also from the cover. Furthermore, the axis element is used during the construction of the battery module as an axis element serving as a template for inserting the cover, the battery cell and the housing in the order of each module in the battery package. Summary of the invention

[0003] The object of the present invention is to improve an energy storage device for a motor vehicle.

[0004] This object is achieved by the features of independent claim 1. Advantageous further developments are given in the dependent claims and in the description.

[0005] One aspect of the invention relates to an energy storage device for a motor vehicle, preferably a commercial vehicle (e.g. a truck or a bus). The energy storage device has a plurality of (e.g. two, three or four) battery module groups, each of which has a plurality of battery modules, each of which consists of a plurality of (e.g. clamped to each other) single cells (e.g. battery stacks). Preferably, the plurality of battery modules of each battery module group can be arranged on a plane, particularly preferably arranged side by side in rows or in a grid. The energy storage device also has a plurality of (e.g. two, three or four) containers, which are stacked (e.g. on each other) and each have a substantially frame-shaped container outer wall, wherein one of the plurality of battery module groups is arranged in one of the plurality of containers. The energy storage device also has a plurality of fixing elements, which are elongated (e.g. rod-shaped), extend through the container outer walls of the plurality of containers respectively and fix the containers to each other (e.g. airtightly).

[0006] Advantageously, the long fixing element that passes through all containers realizes a modular, freely expandable design of the accumulator, and has the characteristics of free geometric configuration, light weight, low cost, and simple and quick assembly and disassembly. The modular structure of the accumulator consisting of any number of container / battery module groups can realize different application possibilities for different vehicles and customer applications in the field of commercial vehicles (such as trucks or buses) or other application fields. Specific tools (such as angle screwdrivers) can be avoided. The fixing element can be easily approached linearly from above. Compared with the corresponding alternating threaded connections of adjacent containers, the continuous fixing element realizes a relatively small number of threaded connections, which can reduce costs and weight. The large length of the fixing element realizes a high robustness to component tolerances, thermal strains and other stresses during operation. Due to the large fixing element length and clamping length, the tightening force can be applied more evenly to the outer wall of the container and the sealing element arranged therebetween if necessary. As a result, the local load on the component can be reduced, which prolongs the service life.

[0007] Preferably, the plurality of fixing elements can fix a plurality of containers to one another without a plurality of battery module strings having to be clamped to one another.

[0008] In one embodiment, the container outer wall is respectively substantially polygonal frame-shaped or substantially rectangular frame-shaped and / or the container outer wall is respectively completely surrounding.

[0009] In a further embodiment, the plurality of fixing elements are each fixed inside the battery (for example in one of the containers or in one of the container outer walls). Preferably, the plurality of fixing elements are each screwed into a blind hole or through-hole thread in the bottom of the battery or in the bottom of the container outer wall of the outermost, preferably the lowermost, container of the plurality of containers. Advantageously, a particularly reliable and protected fixing of the fixing elements can thereby be achieved.

[0010] Alternatively, the multiple fixing elements can be fixed to the outside of the battery respectively, wherein the multiple fixing elements preferably extend through the bottom of the battery or the through holes in the bottom of the container outer wall of the outermost, preferably the lowermost container of the multiple containers and / or are fixed by means of nut connections respectively.

[0011] In a further embodiment, the container outer walls each have an angled wall region and a substantially straight wall region arranged therebetween, and a plurality of fixing elements each extend through each of the substantially straight wall regions.

[0012] In a further embodiment, the plurality of fastening elements are embodied as screws, pins or threaded rods.

[0013] In a further embodiment, the number of the plurality of fixing elements is ≥10, ≥15, ≥20, ≥25, ≥30, ≥35 or ≥40. Alternatively or additionally, the plurality of fixing elements are arranged substantially equidistantly and / or the plurality of fixing elements together form a bar cage that protectively surrounds the battery module group. Alternatively or additionally, the plurality of fixing elements are arranged in coordination with one another so as to exert a uniform fixing force on the periphery of the frame-shaped container outer wall (e.g. equidistantly or non-equidistantly).

[0014] In a further embodiment, the plurality of fixing elements electrically conductively connect container outer walls of a plurality of containers to one another in order to compensate for potential.

[0015] In another embodiment, the battery further comprises at least one frame-shaped sealing element, which is preferably arranged between the opposite end faces of two adjacent containers of the plurality of containers. Preferably, the plurality of fixing elements can extend through the at least one frame-shaped sealing element (for example, through a through hole in the sealing element).

[0016] The frame-shaped sealing element can, for example, have a metal seal, an elastomeric seal, a plastic seal, a sealing wire and / or a sealing paste or a sealing liquid.

[0017] In a further embodiment, the energy storage device also has a plurality of preferably pin-shaped centering elements which orient the containers relative to one another, preferably in an aligned manner. Preferably, the plurality of centering elements can be arranged on the end faces of the container outer walls of the containers.

[0018] In a further embodiment, the plurality of containers each have at least one preferably pillar-shaped or wall-shaped reinforcement element, which preferably extends between mutually opposing inner sides of the container outer wall of the respective container and / or is arranged between a plurality of battery modules of the respective battery module group. Advantageously, additional structurally reinforced components (pillars, support plates, bumper plates) can thereby support the forces generated in the event of an accident and protect vulnerable parts (e.g. battery modules) from damage. The energy storage device can thereby be designed to be particularly reliable, so that even in the event of a fault and during and / or after an accident, a reliable high-voltage battery system is present and the risk to humans and the environment is minimized.

[0019] In a further embodiment, a plurality of containers each have a degassing valve for degassing the corresponding container when a predetermined pressure is exceeded. Preferably, the outer wall of the container may each have a channel, in which the degassing valve of the corresponding container is arranged.

[0020] In a further embodiment, a plurality of containers each have a temperature control device, preferably a cooling plate and / or a heating plate, preferably on the bottom side, for controlling the temperature of the battery module groups arranged in the respective container.

[0021] In a further embodiment, the plurality of containers each have a protective plate on the bottom side, which protects the battery module group arranged in the respective container and / or reinforces the respective container.

[0022] In a further embodiment, a plurality of containers each have a heat insulation element which is essentially frame-shaped and is arranged between a container outer wall of the respective container and a battery module group arranged in the respective container.

[0023] In a further embodiment, the accumulator further comprises a preferably plate-shaped cover which covers the uppermost container of the plurality of containers from above, and optionally an upper thermal insulation layer which is arranged between the cover and the uppermost container. Preferably, the accumulator can additionally comprise an upper frame-shaped sealing element which is preferably arranged between the uppermost container and the upper thermal insulation layer or cover.

[0024] In a further embodiment, the accumulator further comprises a preferably plate-shaped bottom which covers the lowermost container of the plurality of containers from below and optionally a lower thermal insulation layer which is arranged between the bottom and the lowermost container. Preferably, the accumulator can additionally comprise a lower frame-shaped sealing element which is preferably arranged between the lowermost container and the lower thermal insulation layer or the bottom.

[0025] A further aspect of the invention relates to a motor vehicle, preferably a commercial vehicle, particularly preferably a truck or a bus, having an electric storage device as disclosed herein. Preferably, the electric storage device is arranged at, on or between the ladder frame of the motor vehicle or on the roof of the motor vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above-mentioned preferred embodiments and features of the present invention can be combined with each other in any way. Other details and advantages of the present invention are described below with reference to the accompanying drawings. In the accompanying drawings:

[0027] Figure 1 an exploded view showing an accumulator according to one embodiment of the present disclosure; and

[0028] Figure 2 A perspective view of an assembled accumulator according to one embodiment of the present disclosure is shown.

[0029] The embodiments shown in the figures correspond at least in part, so that similar or identical parts are provided with the same reference numerals and, for their explanation, reference is also made to the description of other embodiments or figures in order to avoid repetitions. DETAILED DESCRIPTION

[0030] Figure 1 and 2 An energy storage device 10 (also referred to as a battery pack) for a motor vehicle (not shown separately) is shown. The energy storage device 10 can be arranged in or on the motor vehicle in any desired orientation. The motor vehicle is preferably designed as a truck. It is also possible that the motor vehicle is designed, for example, as a bus, a construction machine, an agricultural machine or a passenger car (Pkw).

[0031] The energy storage device 10 can be used as an electric vehicle battery to provide electrical energy for at least one electric drive unit for driving a motor vehicle. The motor vehicle can be driven, for example, by means of a central electric drive, by means of a plurality of electric wheel hub drives or by means of a plurality of electric drives near the wheels. The energy storage device 10 can be charged, for example, externally via a charging cable connected to a charging socket of the motor vehicle.

[0032] The energy accumulator 10 can be arranged on the vehicle frame or roof of the motor vehicle. The energy accumulator 10 can preferably be arranged on the outer longitudinal side of one of the main longitudinal beams of the vehicle frame of the motor vehicle in the form of a ladder frame. Alternatively, the energy accumulator 10 can be arranged, for example, between two main longitudinal beams of the vehicle frame of the motor vehicle in the form of a ladder frame.

[0033] The energy storage device 10 has a plurality of containers 12 , a plurality of battery module strings 14 and a plurality of fastening elements 16 .

[0034] The containers 12 each have a container outer wall 18. The container outer wall 18 is substantially frame-shaped, preferably substantially polygonal frame-shaped, particularly preferably substantially rectangular frame-shaped. The container outer wall 18 is preferably completely surrounding or forms a closed, multi-sided (eg four-sided) frame.

[0035] The container outer wall 18 can each have two mutually opposite end faces, which are, for example, on the upper side and the lower side of the corresponding container outer wall 18 or the corresponding container 12. The end faces can be circumferential or closed. The end faces can be substantially frame-shaped, preferably substantially polygonal frame-shaped, particularly preferably substantially rectangular frame-shaped.

[0036] The container outer wall 18 can have an inner surface or inner peripheral surface and an outer surface or outer peripheral surface respectively. The inner surface and the outer surface can be surrounding or closed. The inner surface can be substantially frame-shaped, preferably substantially polygonal frame-shaped, particularly preferably substantially rectangular frame-shaped. The inner surface and the outer surface can connect the corresponding opposite end faces of the container outer wall 18 to each other.

[0037] Each container outer wall 18 may be bounded by respective two opposite end faces as well as a respective inner surface and a respective outer surface.

[0038] For example, the container outer wall 18 may preferably be cast from a metal alloy.

[0039] The containers 12 are stacked, preferably aligned or aligned with one another. Preferably, the containers 12 are stacked by means of the container outer wall 18, particularly preferably at the end faces of the container outer wall 18. The stacking direction of the containers 12 is preferably vertical, that is, the containers 12 are stacked on one another. Accordingly, there can be, for example, an uppermost container and a lowermost container 12. However, any other stacking direction is also possible, for example horizontal, etc.

[0040] The containers 12 each receive one of the battery module groups 14. The battery module groups 14 may be arranged or received inside a corresponding container outer wall 18 of the corresponding container 12. The battery module groups 14 may be electrically connected to each other through the container 12.

[0041] The battery module groups 14 each have a plurality of battery modules 20. The battery modules 20 each have a plurality of single cells, for example in the form of at least one battery stack. The stacking direction of the single cells can be freely selectable, for example vertically or horizontally. The single cells of the battery stack are preferably pressed against each other. The single cells of the battery stack are preferably connected in series with each other. The battery modules 20 can preferably be connected in parallel. The battery module groups 14 can preferably be connected in parallel.

[0042] The battery modules 20 of the battery module string 14 are preferably arranged on a plane, for example a horizontal plane. The battery modules 20 of the battery module string 14 are preferably arranged side by side in rows or in a grid.

[0043] The number of containers 12 and / or battery modules 20 of each battery module group 14 can be freely selected to match the corresponding requirements. For example, two, three or four containers 12 can be included. Each battery module group 14 can, for example, include two, three, four, five or six battery modules 20. It turns out that a particularly preferred combination is:

[0044] Four containers 12 each having a battery module group 14 with three battery modules 20 , wherein the three battery modules 20 are preferably arranged next to each other in a row (see Figure 1 and 2 );

[0045] three containers 12 , each of which has a battery module group 14 with four battery modules 20 , wherein the four battery modules 20 are preferably arranged in a grid-like manner (not shown separately in the figures); and

[0046] Two containers 12 , each of which has a battery module group 14 with six battery modules 20 , wherein the six battery modules 20 are preferably arranged next to each other in a row or in a grid (not shown separately in the figures).

[0047] The electrical connection wires 22 can electrically connect the battery modules 20 of the battery module group 14 to each other. The electrical connection wires 22 can have electrical connection heads 24. The electrical connection heads 24 can be arranged on the container outer wall 18 of the corresponding container 12. Preferably, the electrical connection heads 24 can be arranged and maintained on the outer surface of the corresponding container outer wall 18, for example, in a through opening to the inner surface of the corresponding container outer wall 18.

[0048] The containers 12 can each further comprise at least one reinforcement element 26 , a protective plate 28 , a temperature control device 30 , a ventilation valve 32 and / or a thermal insulation element 34 .

[0049] At least one reinforcement element 26 can be implemented, for example, as a reinforcement wall or reinforcement strut. At least one reinforcement element 26 can reinforce the corresponding container 12 or the corresponding container outer wall 18. At least one reinforcement element 26 can extend between mutually opposite sides of the inner surface of the corresponding container outer wall 18 or connect the sides to each other. Each reinforcement element 26 can be arranged between two adjacent battery modules 20 of the battery module group 14 or separate the adjacent battery modules from each other in space. The battery modules 20 and the at least one reinforcement element 26 can be arranged alternately.

[0050] The protective plate 28 can be arranged on the bottom side in the corresponding container 12. The protective plate 28 can reinforce the corresponding container 12. The protective plate 28 can support the battery module group 14 of the corresponding container 12. The protective plate 28 can absorb and dissipate operating loads. The upper side of the protective plate 28 can be shaped to receive the temperature control device 30. The upper side of the protective plate 28 can be shaped, for example, to position or insert a temperature control coil of the temperature control device 30.

[0051] The temperature control device 30 is preferably implemented as a temperature control plate, preferably a cooling plate and / or a heating plate. The temperature control device 30 can be arranged, for example, above or below the battery module group 14 of the corresponding container 12. Preferably, the temperature control device is arranged between the protective plate 28 and the battery module group 14. The temperature control device 30 can cool and / or heat the corresponding battery module group 14 in operation. A temperature control liquid can flow through the temperature control device 30 to cause heating or cooling. It is possible that in order to bridge the gap between the temperature control device 30 and the battery module 20, a gap filler or gap filler in the form of a thermally conductive paste is connected to the battery module 20 with the temperature control device 30.

[0052] The connection for introducing and removing the temperature control liquid can be arranged in the container outer wall 18 of the corresponding container 12, for example in at least one channel between the inner surface and the outer surface of the corresponding container outer wall 18. It is possible that the temperature control device 30 is elastically supported or suspended in the corresponding container 12.

[0053] The temperature control devices 30 of the container 12 can be connected to one another via a common temperature control liquid supply line 36 and / or a common temperature control liquid discharge line 38. The lines 36 and / or 38 can be arranged outside the container 12. Advantageously, the lines 36 and / or 38 can thereby be tightened from the outside and / or manufacturing tolerances and thermal stresses can be compensated.

[0054] The exhaust valve 32 can exhaust the corresponding container 12 by opening when a predetermined pressure is exceeded. Preferably, the exhaust valve 32 is arranged in a passage between the inner surface and the outer surface of the container outer wall 18 of the corresponding container 12.

[0055] The heat insulating element 34 may be substantially frame-shaped, preferably polygonal frame-shaped, particularly preferably rectangular frame-shaped. The heat insulating element 34 may be arranged on the inner surface of the container outer wall 18 of the corresponding container 12. The heat insulating element 34 may be arranged between the container outer wall 18 of the corresponding container 12 and the battery module group 14 arranged in the corresponding container 12. The heat insulating element 34 may surround the battery module group 14.

[0056] The accumulator 10 may have an (upper) cover 40. The cover 40 may cover the uppermost container 12 from above. The cover 40 may reinforce the uppermost container 12. An upper heat insulating layer 42 of the accumulator 10 may be arranged between the cover 40 and the uppermost container 12. The heat insulating layer 42 may be made of a heat insulating material. The cover 40 and / or the heat insulating layer 42 may be plate-shaped. The cover 40 and / or the heat insulating layer 42 may be polygonal, preferably rectangular. The cover 40 may preferably be fixed to the container 12 together with the heat insulating layer 42 by means of a fixing element 16.

[0057] The accumulator 10 may have a bottom 44. The bottom 44 may cover the lowermost container 12 from below. The bottom 44 may reinforce the lowermost container 12. A thermal insulation layer 46 below the accumulator 10 may be arranged between the bottom 44 and the lowermost container 12. The thermal insulation layer 46 may be made of a thermal insulation material. The bottom 44 and / or the thermal insulation layer 46 may be plate-shaped. The bottom 44 and / or the thermal insulation layer 46 may be polygonal, preferably rectangular. The bottom 44 may be fixed to the lowermost container 12 together with the thermal insulation layer 46 by means of a plurality of fixing elements 48. Alternatively, for example, the fixing element 16 may fix the bottom 44 together with the thermal insulation layer 46, for example by receiving a blind hole with a thread in the bottom 44 or fixing the bottom 44 to the end of the fixing element 16 by means of a nut.

[0058] The energy storage device 10 may have at least one frame-shaped sealing element 50. The frame-shaped sealing element 50 may be respectively attached to the end faces of the container outer wall 18. Each sealing element 50 may be arranged between two adjacent containers 12, preferably between the end faces of the container outer walls 18 of two adjacent containers 12 that are opposite to each other. The frame-shaped sealing element 50 may also be arranged between the cover 40 or the insulation layer 42 and the uppermost container 12. Alternatively or additionally, the frame-shaped sealing element 50 may be arranged between the bottom 44 or the insulation layer 46 and the lowermost container 12. The fixing element 16 may extend through the through hole in the sealing element 50.

[0059] The energy storage device 10 can be held together preferably in a gas-tight manner by means of the fixing element 16. The fixing element 16 extends through the container outer wall 18 of the plurality of containers 12 respectively and fixes all the stacked containers 12 to each other in a force-fitting manner. The fixing element 16 can ensure, together with the sealing element 52, a sufficient sealing effect for sealing the high-voltage inner area formed by the battery module group 14 from external environmental influences. The fixing element 16 can connect all the container outer walls 18 to each other in an electrically conductive manner to achieve compensation of the potential between the containers 12.

[0060] The fixing element 16 is elongated and preferably rod-shaped. The fixing element 16 can preferably be designed as a screw, a pin or a threaded rod.

[0061] Specifically, the container outer wall 18 of all containers 12 except at least the outermost (e.g., the lowermost) container 12 may have a through hole, through which the fixing element 16 may extend. These through holes may be aligned or aligned with each other. Or the container outer wall 18 of the outermost / lowermost container 12 may have a through hole for the fixing element 16. The fixing element 16 extending through these through holes may be fixed, for example, by means of a nut, etc., which may be positioned below the lowermost container 12, for example, on the bottom 44. Alternatively, the fixing element 16 may, for example, extend through the through hole of the lowermost container 12 and be screwed into a blind hole in the bottom 44. The through hole of the container 12 may extend between the opposite end faces of the container outer wall 18. Alternatively, the fixing element 16 may, for example, extend into a blind hole in the container outer wall 18 of the outermost / lowermost container 12 and be screwed into it.

[0062] The number of fixing elements 16 can preferably be ≥10, ≥15, ≥20, ≥25, ≥30. The fixing elements 16 can be arranged substantially equidistantly. A plurality of fixing elements 16 can extend through each substantially straight wall region of the substantially straight wall region of the container outer wall 18, respectively. The substantially straight wall regions extend between the corner regions or corners of the container outer wall 18, respectively. The fixing elements 16 can together form a bar cage, which surrounds the battery module group 14 in a protective manner.

[0063] The length of the fixing element 16 may be related to the number of containers 12. The length of the fixing element 16 may, for example, be in the range between 170 mm and 500 mm.

[0064] The containers 12 can be centered or positioned relative to each other by means of a plurality of centering elements or positioning elements 52. The centering elements 52 can be implemented as pins or needles. The centering elements 52 can be arranged on the end faces of the container outer walls 18. The opposite end walls of the container outer walls 18 of adjacent containers 12 can respectively have blind holes for receiving the centering elements.

[0065] The present invention is not limited to the preferred embodiments described above. Rather, a number of variants and modifications are possible, which also utilize the inventive concept and therefore belong to the scope of protection. In particular, the present invention also claims protection for the subject matter and features of the dependent claims, independently of the claims cited. In particular, the individual features of independent claim 1 are disclosed independently of one another. In addition, the features of the dependent claims are disclosed independently of all features of the independent claim 1, for example, independently of the feature disclosures related to the presence and / or configuration of the container, battery module group and / or fixing element of the independent claim 1. All range descriptions herein are to be understood as being disclosed in such a way that all values ​​falling within the respective range are disclosed individually, for example, also as preferred narrower outer boundaries of the respective ranges, respectively.

[0066] List of Reference Numerals

[0067] 10 Accumulator

[0068] 12 Container

[0069] 14 Battery Module Group

[0070] 16 Fixing elements

[0071] 18 Container outer wall

[0072] 20 Battery Module

[0073] 22 Electrical connection wire

[0074] 24 Electrical connector

[0075] 26 Reinforcement elements

[0076] 28 Protection board

[0077] 30 Temperature control device

[0078] 32 Exhaust valve

[0079] 34 Insulation elements

[0080] 36 Temperature control liquid-input pipeline

[0081] 38 Temperature control liquid-output pipeline

[0082] 40 Cover

[0083] 42 Insulation

[0084] 44 bottom

[0085] 46 Insulation

[0086] 48 Fixing elements

[0087] 50 Sealing element

[0088] 52 Centering element.

Claims

1. An electric storage device (10) for a motor vehicle, preferably a commercial vehicle, comprising: A plurality of battery module groups (14), each of which comprises a plurality of battery modules (20), each of which is composed of a plurality of single cells. in, Preferably, the plurality of battery modules (20) of each battery module group (14) are arranged on a plane, particularly preferably arranged side by side in a row or in a grid; A plurality of containers (12) are stacked and each have a substantially frame-shaped container outer wall (18), wherein one of the plurality of battery module groups (14) is arranged in one of the plurality of containers (12), and A plurality of fixing elements (16) are elongated and extend through the container outer walls (18) of the plurality of containers (12) respectively and fix the containers (12) to each other.

2. The battery (10) according to claim 1, in: The outer wall (18) of the container is respectively substantially polygonal frame-shaped or substantially rectangular frame-shaped; and / or The container outer wall (18) is respectively completely circumferential.

3. The battery (10) according to claim 1 or claim 2, in: The plurality of fixing elements (16) are respectively fixed inside the energy storage device (10), wherein the plurality of fixing elements (16) are preferably screwed into a blind hole or a through-hole thread in the bottom (44) of the energy storage device (10) or in the bottom of the container outer wall (18) of the outermost, preferably the lowermost, container (12) of the plurality of containers (12); or The plurality of fixing elements (16) are respectively fixed to the outside of the energy storage device (10), wherein preferably the plurality of fixing elements (16) respectively extend through through holes in the bottom (44) of the bottom of the energy storage device (10) or the bottom (44) of the container outer wall (18) of the outermost, preferably the lowermost container (12) of the plurality of containers (12) and / or are respectively fixed by means of nut connections.

4. The energy storage device (10) according to any one of the preceding claims, in: The container outer walls (18) each have an angled wall region and an essentially straight wall region arranged therebetween, and The plurality of fixing elements (16) extend through each of the substantially straight wall regions, respectively.

5. The energy storage device (10) according to any one of the preceding claims, in, Satisfy at least one of the following characteristics: The plurality of fixing elements (16) are implemented as bolts, pins or threaded rods; The number of the plurality of fixing elements (16) is ≥10, ≥15, ≥20, ≥25, ≥30, ≥35, or ≥40; The plurality of fixing elements (16) are arranged substantially equidistantly; The plurality of fixing elements (16) are arranged in coordination with each other so as to apply a uniform fixing force on the periphery of the frame-shaped container outer wall (18); and The plurality of fixing elements (16) together form a grid cage which protectively surrounds the battery module group (14).

6. The energy storage device (10) according to any one of the preceding claims, in: The plurality of fixing elements (16) connect the container outer walls (18) of the plurality of containers (12) to one another in an electrically conductive manner to compensate for potential.

7. The energy storage device (10) according to any one of the preceding claims, further comprising: at least one frame-shaped sealing element (50), the at least one frame-shaped sealing element being arranged between opposite end faces of two adjacent containers (12) of the plurality of containers (12), in, Preferably, the plurality of fixing elements (16) each extend through at least one frame-shaped sealing element (50).

8. The energy storage device (10) according to any one of the preceding claims, further comprising: a plurality of centering elements (52), preferably in the form of pins, which orient the containers (12) relative to one another, preferably in alignment, in, Preferably, the plurality of centering elements (52) are arranged on an end face of a container outer wall (18) of the container (12).

9. The energy storage device (10) according to any one of the preceding claims, in: The plurality of containers (12) each have at least one preferably pillar-shaped or wall-shaped reinforcement element (26), which extends between mutually opposite inner sides of a container outer wall (18) of the respective container (12) and is arranged between a plurality of battery modules (20) of the respective battery module group (14).

10. The energy storage device (10) according to any one of the preceding claims, in: The plurality of containers (12) are respectively provided with an exhaust valve (32) for exhausting the corresponding container (12) when a predetermined pressure is exceeded. In this case, the container outer walls (18) preferably each have a channel, in which the exhaust valve (32) of the corresponding container (12) is arranged.

11. The energy storage device (10) according to any one of the preceding claims, in: The plurality of containers (12) each have a temperature control device (30), preferably a cooling plate and / or a heating plate, preferably on the bottom side, for controlling the temperature of a battery module group (14) arranged in the respective container (12).

12. The energy storage device (10) according to any one of the preceding claims, in: The plurality of containers (12) each have a protective plate (28) on the bottom side, which protects a battery module group (14) arranged in the corresponding container (12) and / or reinforces the corresponding container (12).

13. The energy storage device (10) according to any one of the preceding claims, in: The plurality of containers (12) each have a heat insulation element (34) which is substantially frame-shaped and is arranged between a container outer wall (18) of the respective container (12) and a battery module group (14) arranged in the respective container (12).

14. The energy storage device (10) according to any one of the preceding claims, further comprising: A preferably plate-shaped cover (40) covering the uppermost container of the plurality of containers (12) from above, and an upper heat-insulating layer (42) arranged between the cover (40) and the uppermost container (12), and a preferably upper frame-shaped sealing element (50) arranged between the uppermost container (12) and the upper heat-insulating layer (42) or the cover (40); and / or A preferably plate-shaped bottom (44) which covers the lowest container of the plurality of containers (12) from below, and a lower insulation layer (46) which is arranged between the bottom (44) and the lowest container (12), and a preferably lower frame-shaped sealing element (50) which is arranged between the lowest container (12) and the lower insulation layer (46) or the bottom (44).

15. A motor vehicle, preferably a commercial vehicle, particularly preferably a truck or a bus, comprising: The energy storage device (10) according to any one of the preceding claims, in, The electrical storage device (10) is preferably arranged at, on or between the ladder frame of the motor vehicle or on the roof of the motor vehicle.

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