Energy storage arrangement and method for docking battery modules of an energy storing arrangement

Abstract

An energy storage arrangement, comprising a first battery module and a second battery module configured to be arranged on a respective side of a vehicle chassis, the first and second battery modules comprising a respective connecting side configured to face each other, wherein the first battery module comprises a second male connecting element and a third male connecting element arranged on the connecting side of the first battery module, wherein the second battery module comprises a second female connecting element and a third female connecting element arranged on the connecting side of the second battery module, and wherein, during assembly of the first and second battery modules, the second male connecting element is arranged to be guided into the second female connecting element and the third male connecting element is arranged to be guided into the third female connecting element.

Description

ENERGY STORAGE ARRANGEMENT AND METHOD FOR DOCKING BATTERYMODULES OF AN ENERGY STORING ARRANGEMENTTECHNICAL FIELD

[0001] The disclosure relates generally to energy storage arrangements. In particular aspects, the disclosure relates to an energy storage arrangement comprising a first and a second battery module. The disclosure can be applied to heavy-duty vehicles, such as trucks, buses, and construction equipment, among other vehicle types. Although the disclosure may be described with respect to a particular vehicle, the disclosure is not restricted to any particular vehicle.BACKGROUND

[0002] The propulsion systems of vehicles are continuously developed to meet the demands from the market. A particular aspect relates to the emission of environmentally harmful exhaust gas. Therefore, vehicles propelled by electric traction motors have been increasingly popular, both for cars as well as for trucks and other heavy duty vehicles.

[0003] For heavy duty vehicles, the energy storage arrangement, often in the form of traction batteries, need to be relatively large in size to be able to contain a sufficient level of energy such that the vehicle can be operated at an acceptable range using the electric traction motors. The large energy storage arrangements are in turn of substantial weight, and there is a challenged to position and assemble these energy storage systems to the frame of the heavy duty vehicle.SUMMARY

[0004] According to a first aspect, there is provided an energy storage arrangement, comprising a first battery module and a second battery module configured to be arranged on a respective side of a vehicle chassis, the first and second battery modules comprising a respective connecting side configured to face each other, wherein the first battery module comprises a second male connecting element and a third male connecting element arrangedon the connecting side of the first battery module, wherein the second battery module comprises a second female connecting element and a third female connecting element arranged on the connecting side of the second battery module, and wherein, during assembly of the first and second battery modules, the second male connecting element is arranged to be guided into the second female connecting element and the third male connecting element is arranged to be guided into the third female connecting element.

[0005] The first aspect of the disclosure may seek to at least partly mitigate the problem of difficult and non-precise docking of a first and a second battery module to each other. A technical benefit may include that an energy storage arrangement with at least two battery modules is securely and efficiently connected to each other. By connecting at least two battery modules to each other, the energy storage arrangement can obtain a relatively large maximum state of charge level which in turn may enable for a relatively long range of operation before charging is required.

[0006] Guiding of the first and the second battery modules inwardly towards the vehicle chassis, preferably in a lateral direction of the chassis to set the lateral positioning of the battery modules relative the vehicle chassis may be carried out by an operator or be an automated guiding such as by a robot.

[0007] Optionally in some examples, including in at least one preferred example, wherein the second male connecting element and the second female connecting element has a second tolerance, and the third male connecting element and the third female connecting element has a third tolerance, the second and third tolerances being the same.

[0008] Optionally in some examples, including in at least one preferred example, wherein the second male connecting element and the second female connecting element has a second tolerance, and the third male connecting element and the third female connecting element has a third tolerance, the second and third tolerances being different from each other.

[0009] Optionally in some examples, including in at least one preferred example, wherein the second tolerance is greater in a vertical direction of the energy storage arrangement compared to a longitudinal direction of the energy storage arrangement.

[0010] Optionally in some examples, including in at least one preferred example, wherein the third tolerance is greater in a longitudinal direction of the energy storage arrangement compared to a vertical direction of the energy storage arrangement.

[0011] Optionally in some examples, including in at least one preferred example, wherein the first battery module comprises a first male connecting element arranged on the connecting side of the first battery module, wherein the second battery module comprises a first female connecting element arranged on the connecting side of the second battery module, the first male connecting element being guided into the first female connecting element during assembly of the first and second battery modules.

[0012] Optionally in some examples, including in at least one preferred example, wherein the first male connecting element and the first female connecting element has a first tolerance, the first tolerance being greater in a longitudinal direction of the energy storage arrangement compared to the second tolerance in the longitudinal direction of the energy storage arrangement.

[0013] Optionally in some examples, including in at least one preferred example, wherein the first male connecting element and the first female connecting element has a first tolerance, the first tolerance being greater in a longitudinal direction of the energy storage arrangement compared to a vertical direction of the energy storage arrangement.

[0014] Optionally in some examples, including in at least one preferred example, wherein the first male connecting element is arranged at a longitudinal outer end position of the first battery module, and the first female connecting element is arranged at a longitudinal outer end position of the second battery module.

[0015] Optionally in some examples, including in at least one preferred example, wherein the first male connecting element is arranged at a corner position of the connecting side of the first battery module at the longitudinal outer end position thereof, and whereinthe first female connecting element is arranged at a comer position of the connecting side of the second battery module at the longitudinal outer end position thereof.

[0016] Optionally in some examples, including in at least one preferred example, wherein the first and second battery modules comprise a respective plurality of battery packs arranged side-by-side along a longitudinal direction of the energy storage arrangement.

[0017] Optionally in some examples, including in at least one preferred example, wherein at least every other of the battery packs of the first and second battery modules comprises the corresponding third male and female connecting element.

[0018] According to a second aspect, there is provided a method of docking a first and a second battery module of an energy storage arrangement to each other on a respective side of a vehicle chassis, the method comprising: guiding the first and second battery modules relatively towards each other in a lateral direction of the vehicle chassis, wherein guiding of the first and second battery modules comprises: a second finer guiding for setting a predetermined longitudinal position of the first and second battery modules by guiding a second male connecting element of the first battery module and a second female connecting element of the second battery module into each other, the second male and female connecting elements being arranged on a connecting side of the respective first and second battery modules, and a third finer guiding for setting a predetermined vertical position of the first and second battery modules by guiding a third male connecting element of the first battery module and a third female connecting element of the second battery module into each other, the third male and female connecting elements being arranged on the connecting side of the respective first and second battery modules.

[0019] Optionally in some examples, including in at least one preferred example, wherein the second finer guiding is preceded by: a first rough guiding in which a first male connecting element of the first battery module and a first female connecting element of the second battery module are guided into to each other, the first male and female connecting elements being arranged on the connecting side of the respective first and second battery modules.

[0020] Optionally in some examples, including in at least one preferred example, wherein the first and second battery modules being guided towards each other by using a first and a second automated guided vehicle, AGV.

[0021] Optionally in some examples, including in at least one preferred example, wherein the first and second AGV each comprises an optical alignment system communicating with each other for guiding the first and second AGV to arrange the first and second battery modules to assume a relative vertical and longitudinal position.

[0022] According to a third aspect of the disclosure, a method for docking of a first and a second battery module of an energy storage arrangement to a respective side of a chassis is provided, the vehicle chassis extending in a Y-direction, an X-direction and a Z-direction, the method comprising; a) guiding the first and the second battery modules inwardly towards the vehicle chassis in a Y-direction of the chassis to set the Y-positioning of the battery modules relative the vehicle chassis, b) activating a mechanical guiding for guiding the battery modules inwardly towards the vehicle chassis in the Y-direction of the chassis to the predetermined end position including; a first rough guiding, wherein a first male connecting element is provided on a connecting side of one of the battery modules and a matching first female connecting element is provided on a connecting side of the other one of the battery modules and wherein the battery modules are guided in the X- and Z-direction to a first relative position by connecting the first male connecting element to the first female connecting element, the first male connecting element and the first female connecting element having a first tolerance, alternatively, the first rough guiding is provided by an optical communication between the first and second battery module wherein the battery modules are aligned and guided in the X- and Z- direction to a first relative position;a second finer guiding for setting a predetermined X-positions of the battery modules, wherein at least one second male connecting element is provided on the connecting side of one of the battery modules and at least one matching second female connecting element is provided on the connecting side of the other one of the battery modules, the second male connecting element and the second female connecting element having a second tolerance and wherein the second tolerance is greater in the Z- direction compared to the X-direction; a third finer guiding for setting a predetermined Z-position of the battery modules, wherein at least one third male connecting element is provided on the connecting side of one of the battery modules and at least one matching third female connecting element is provided on the connecting side of the other battery module, and wherein the third male connecting element(s) and the third female connecting element(s) have a third tolerance and wherein the third tolerance between the third male and female connecting element(s) is greater in the X-direction compared to the Z-direction and wherein the battery modules are guided to the predetermined Z-position by aligning and connecting the third male connecting element(s) and the third female connecting element(s).

[0023] The third aspect of the disclosure may seek to at least partly mitigate the problem of difficult and non-precise docking of a first and a second battery module to each other. A technical benefit may include that an energy storage arrangement with at least two battery modules is securely and efficiently connected to each other. By connecting at least two battery modules to each other, the energy storage arrangement can obtain a relatively large maximum state of charge level which in turn may enable for a relatively long range of operation before charging is required.

[0024] Furthermore, using a first rough guiding, followed by a second and third finer guiding steps wherein the X- and the Z-directions are adjusted provides an improved and more precise docking of the battery modules which requires less adjustments between thebattery modules during the docking operation and thereby simplifies the docking operation and reduces the time of the docking. The X-direction may also be referred to as the longitudinal direction, the Y-direction may be referred to as the lateral direction, and the Z- direction may be referred to as the vertical direction.

[0025] Guiding of the first and the second battery modules inwardly towards the vehicle chassis in a Y-direction of the chassis to set the Y-positioning of the battery modules relative the vehicle chassis may be carried out by an operator or be an automated guiding such as by a robot.

[0026] Optionally in some examples, including in at least one preferred example, the battery modules comprise a set of second male and a set of second female connecting elements, the sets of second male and female connecting elements being aligned respectively, as seen in the X-direction. A technical benefit may include an improved and more precise positioning of the Z-position of the battery modules.

[0027] Optionally in some examples, including in at least one preferred example, the battery modules comprise a set of third male and a set of third female connecting elements, the sets of third male and female connecting elements being aligned respectively, as seen in the X-direction. A technical benefit may include enable alignment around the Y direction and thereby providing an improved and more precise positioning of the Y-position of the battery modules.

[0028] Optionally in some examples, including in at least one preferred example, the battery modules each comprises a plurality of battery packs arranged side-by-side, as seen in the X-direction, and wherein at least two third male connecting element are provided on the connecting side of one of the battery modules and at least two matching third female connecting element is provided on the connecting side of the other battery module, and wherein the third connecting elements are provided on non-adjacent battery packs.

[0029] Optionally in some examples, including in at least one preferred example, the battery modules each comprises a plurality of battery packs arranged side-by-side, as seen in the X-direction wherein at least every other, optionally each, of the battery packs in the battery modules comprises a third male or female connecting element, and wherein the thirdmale or female connecting elements are aligned with each other, as seen in the X-direction. A technical benefit may include an improved and more precise positioning of the Z-position of the battery modules.

[0030] Optionally in some examples, including in at least one preferred example, the method comprises a fourth guiding step to set the position of the first and second battery modules in a correct Y-position, wherein the chassis comprises male or female chassis guiding elements and the first and second battery modules comprises matching female or male guiding elements. A technical benefit may include that the first and second battery modules may be steered into a correct Y-position in relation to the chassis of the vehicle if the initial positioning is not correctly aligned with the chassis.

[0031] Optionally in some examples, including in at least one preferred example, the rough guiding is provided by the first male connecting element being connected to an outermost side surface, extending in the Y-direction, of one of the battery modules and the matching first female connecting element being provided on an outermost side surface, extending in the Y-direction, of the other one of the battery modules. A technical benefit may include that the arrangement of the first male and female connecting elements to an outermost surface of the respective battery module does not interfere with the configuration of the battery pack housing at the connecting side. A connection portion of the first male connecting element may be connected to the outermost side of the battery module while the male connecting element, such as a pin portion, projects from the connection side of the battery module. In a corresponding manner, the first female connecting element may comprise a connection portion which is attached to the outermost side of the other one of the battery modules and wherein the first female connecting element is aligned with the connecting side of the battery module.

[0032] Optionally in some examples, including in at least one preferred example, the first male and female connecting elements are arranged at a corner portion of the respective connecting sides. A technical benefit may include that the arrangement of the first male and female connecting elements to an outermost surface of the respective battery module does not interfere with the configuration of the battery pack housing at the connecting side.

[0033] Optionally in some examples, including in at least one preferred example, the length of the first male connecting elements is greater than the length of the second and third male elements, as measured from the connecting side of the battery module. A technical benefit may include that the first male connecting element connects with the first female connecting element to provide a rough guiding of the first and second battery modules in the X- and Z-directions to arrive at a first relative position, prior to starting the guiding by means of the second and third connecting elements.

[0034] Optionally in some examples, including in at least one preferred example, a tip portion of the first male connecting elements has a smaller cross-section than a base portion of the first male connecting element. A technical benefit may include that there is a greater initial tolerance between the first connecting elements which facilitates the initial connection while the precision increases upon when moving the battery modules inwardly in the Y-direction.

[0035] Optionally in some examples, including in at least one preferred example, the first male connecting element has a tapered shape. A technical benefit may include that there is a greater initial tolerance between the first connecting elements which facilitates the initial connection while the precision increases upon when moving the battery modules inwardly in the Y-direction.

[0036] Optionally in some examples, including in at least one preferred example, the first tolerance is greater than the second tolerance, as measured in the X-direction. A technical benefit may include that the initial contact between first male and female connecting elements, and connection between the battery modules, is facilitated, i.e. a rough guiding, and that the subsequent guiding towards the predetermined X-position by means of the second male and female connecting elements is more precise, i.e a finer guiding.

[0037] Optionally in some examples, including in at least one preferred example, the first tolerance is greater than the third tolerance, as measured in the Z-direction. A technical benefit may include that the initial contact between first male and female connecting elements, and connection between the battery modules, is facilitated, i.e. a rough guiding,and that the subsequent guiding towards the predetermined Z-position by means of the third male and female connecting elements is more precise, i.e a finer guiding.

[0038] Optionally in some examples, including in at least one preferred example, wherein the second female connecting element(s) comprises an oval or rectangular opening having a greatest extension in the Z-direction. A technical benefit may include that the greater tolerance in the Z-direction facilitates the initial connection of the second connecting elements and guiding in the X-direction to the predetermined X-position of the battery modules.

[0039] Optionally in some examples, including in at least one preferred example, the third female connecting element(s) comprises an oval or rectangular opening having a greatest extension in the X-direction. A technical benefit may include that the greater tolerance in the X-direction facilitates the initial connection of the third connecting elements and guiding in the Z-direction to the predetermined Z-position of the battery modules.

[0040] Optionally in some examples, including in at least one preferred example, the second and the third finer guiding of the battery modules are carried out simultaneously.

[0041] Optionally in some examples, including in at least one preferred example, the each one of the first and the second battery modules comprises a plurality of battery packs arranged side-by-side and wherein the battery packs are mechanically interconnected to adjacent battery pack(s).

[0042] Optionally in some examples, including in at least one preferred example, wherein the optical communication uses laser or infra-red light.

[0043] Optionally in some examples, including in at least one preferred example, the method is for docking of a first and a second battery module of an energy storage arrangement to a respective side of a vehicle chassis with an Automatic Guided Vehicle (AGV), comprising; a) providing the first battery module with a master AGV and the second battery module with a slave AGV on a respective side of the vehicle chassis; b) synchronizing the speed of the master AGV with the speed of the chassis;c) synchronizing the speed and the X-position, being the position as seen in the X- direction of the chassis, of the slave AGV to the speed of the master AGV; d) guiding the AGV’s inwardly towards the vehicle chassis in a Y-direction of the chassis to set the Y-positioning of the AGV’s relative the vehicle chassis, e) activating the mechanical guiding for guiding the AGV’ s inwardly towards the vehicle chassis in the Y-direction of the chassis to the predetermined end position.

[0044] The mechanical guiding activated in e) being according to the third aspect of the present disclosure.

[0045] Guiding of the the AGV’s inwardly towards the vehicle chassis in a Y-direction of the chassis to set the Y-positioning of the AGV’s relative the vehicle chassis may be carried out by an operator or be an automated guiding.

[0046] In the current method of docking a first and a second battery module, two heavy modules are coming from a respective side of a chassis and needs to be assembled with high precision. The battery modules need to meet tolerances both at module level and on a truck assembly line. The AGV has limited accuracy, and to achieve the correct position with sufficient accuracy to be able to join the two sides together, additional guiding is needed to force the respective battery module to meet in the correct position.

[0047] In addition, the guiding features also act as separate guiding for different directions, one in X (longitudinal) and one in Z (vertical). The guiding sequence as disclosed herein with different initiation points in Y-direction (docking direction) may therefore improve the guiding significantly.

[0048] The disclosed aspects, examples (including any preferred examples), and / or accompanying claims may be suitably combined with each other as would be apparent to anyone of ordinary skill in the art. Thus, and for example, the advantages associated with the present disclosure and described above in relation to the third aspect are equally associated with the disclosure described in relation to the first and second aspects forcorresponding features thereof. Additional features and advantages are disclosed in the following description, claims, and drawings, and in part will be readily apparent therefrom to those skilled in the art or recognized by practicing the disclosure as described herein.BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Examples are described in more detail below with reference to the appended drawings.

[0050] Fig. 1 is an exemplary illustration of a vehicle according to an example;

[0051] Fig. 2 is an exemplary illustration of an energy storage arrangement according to an example;

[0052] Fig. 3 is an exemplary illustration of an energy storage arrangement according to an example;

[0053] Figs.4A-4C illustrate a method of docking of the first and the second battery module according to an example;

[0054] Figs.5A-5C illustrate an alternative method of docking of the first and the second battery module according to an example; and

[0055] Fig. 6 is a flowchart of the method as disclosed herein.DETAILED DESCRIPTION

[0056] The detailed description set forth below provides information and examples of the disclosed technology with sufficient detail to enable those skilled in the art to practice the disclosure.

[0057] The following disclosure aims at minimizing the problem of difficult and nonsecure interconnection of a plurality of energy storage modules connected to each other. A technical benefit may include that an energy storage arrangement with at least two battery modules is securely and efficiently connected to each other. A relatively large energystorage arrangement can be provided which may enable for a relatively long range of operation for electric traction motors of the vehicle.

[0058] Turning to Fig. 1, which is an exemplary illustration of a vehicle 100 according to an example. The exemplified vehicle 100 is configured to be at least partly propelled by one or more electric traction motors 101. In Fig. 1, the electric traction motors 101 are exemplified as wheel hub motors connected to the pair of front wheels 102 as well as to the foremost pair of rear wheels 103. However, the vehicle 100 may alternatively comprises a single electric traction motor connected to the wheels via a conventional propulsion shaft (not shown). The at least one electric traction motor 101 is configured to apply a propulsive power to the wheels of the vehicle during propulsion, and to generate electric power during braking.

[0059] The vehicle 100 further comprises an energy storage arrangement 1, also referred to as a high-voltage vehicle battery. The energy storage arrangement 1 is configured to feed electric power to the electric traction motor 101 during propulsion of the vehicle 100 and to receive electric power during braking. In order to describe the connection of the energy storage arrangement 1 to the frame of the vehicle 100, reference is now made to Fig. 2.

[0060] Fig. 2 is a view of the energy storage arrangement 1 comprising a first and a second battery module 2,3 prior to connection to a frame 50 of the vehicle 100 according to an example. In particular, the first battery module 2 is arranged at a first lateral side of the frame 50, and the second energy battery module 3 is arranged at a second lateral side of the frame 50. The exemplified frame 50 comprises a pair of longitudinal frame members 52, 54. Put it differently, the frame 50 comprises a first frame member 52 and a second frame member 54, wherein each of the first 52 and second 54 frame members extends in the X- direction, i.e. the longitudinal direction of the vehicle 100. Thus, in a mounted position the first battery module 2 is connected to the frame 50 on a first lateral side and the second battery module 3 is connected to the frame 50 on a second lateral side.

[0061] The first battery module 2 comprises a set of battery packs 2a, 2b, 2c, 2d arranged side-by-side, as seen in the X-direction and the second battery module 3 also comprises a set of battery packs 3a, 3b, 3c, 3d arranged side-by-side, as seen in the X-direction. In this figurethere are four battery packs for each battery module, however, with “a set” herein is intended two or more.

[0062] The present disclosure thus relates to the energy storage arrangement (1). Additionally, the disclosure also relates to a method of docking the first and the second battery module of the energy storage arrangement to each other on a respective side of the vehicle chassis, the method comprising: guiding the first (2) and second (3) battery modules relatively towards each other in the lateral direction of the vehicle chassis, wherein guiding of the first and second battery modules comprises: a second finer guiding for setting a predetermined longitudinal position of the first and second battery modules by guiding a second male connecting element of the first battery module and a second female connecting element of the second battery module into each other, the second male and female connecting elements being arranged on a connecting side of the respective first and second battery modules, and a third finer guiding for setting a predetermined vertical position of the first and second battery modules by guiding a third male connecting element of the first battery module and a third female connecting element of the second battery module into each other, the third male and female connecting elements being arranged on the connecting side of the respective first and second battery modules.

[0063] The present disclosure additionally relates to a method of docking of the first and the second battery module 2,3 to a respective side of a vehicle chassis, here represented by the frame 50, and connecting the first and the second battery module to each other at a respective connecting side 20,30. The frame 50 extending in a Y-direction, an X-direction and a Z-direction. By Y-direction here is intended both the first 52 and the second 54 frame members as the total chassis. The first and the second battery modules 2,3 comprises a plurality of connecting elements, here exemplified as guiding pins, for improving precision, simplicity and efficiency when connecting the battery modules to each other. By connecting at least two battery modules to each other, the energy storage arrangement can obtain a relatively large maximum state of charge level which in turn may enable for a relatively long range of operation before charging is required.

[0064] One of the battery modules, here exemplified by the first battery module 2, comprises an optional first male connecting element 4 and the other one of the batterymodules, here exemplified by the second battery module 3, comprises an optional matching first female connecting element 5, here exemplified as guiding apertures. The first male and female connecting elements 4,5 are provided on the connecting side 20,30 of the respective battery module 2,3 and are arranged to connect and thereby align and guide the first and second battery modules 2,3 in the X- and Z-direction.

[0065] One of the battery modules, here exemplified by the first battery module 2, furthermore comprises a second male connecting element 6 and the other one of the battery modules, here exemplified by the second battery module 3, comprises a matching second female connecting element 7. The second male and female connecting elements 6,7 are provided on the connecting side 20,30 of the respective battery module 2,3 and are arranged to connect and thereby guide the positioning of the first and second battery modules 2,3, as seen in the X-direction.

[0066] Additionally, one of the battery modules, here exemplified by the first battery module 2, furthermore comprises two third male connecting elements 8 and the other one of the battery modules, here exemplified by the second battery module 3, comprises two matching third female connecting elements 9. The third male and female connecting elements 8,9 are provided on the connecting side 20,30 of the respective battery module 2,3 and are arranged to connect and thereby guide the positioning of the first and second battery modules 2,3, as seen in the Z-direction.

[0067] The first male connecting element may also be referred to as an outer male connecting element and the first female connecting element may be referred to as an outer female connecting element. The second male connecting element may be referred to as an upper male connecting element, or a first inner male connecting element and the second female connecting element may be referred to as an upper female connecting element, or a first inner female connecting element. The third male connecting element may be referred to as a lower male connecting element, or a second inner male connecting element and the third female connecting element may be referred to as a lower female connecting element, or a second inner female connecting element.

[0068] The two third male connecting elements 8 are provided on non-adjacent battery packs 2a, 2b, 2c, 2d and the two matching female connecting elements 9 are subsequently also provided on non-adjacent and opposing battery packs 3a, 3b, 3c, 3d.

[0069] It is noted that in this Fig. 2 each of the male connecting elements 4,6,8 are arranged on the same battery module 2, however, this is not necessary and the optional first male connecting element may for example be arranged on the same battery module as the second and third female connecting elements, or the second male connecting element may be arranged on the same battery module as the third female connecting element and so on.

[0070] The first 2 and second 3 battery modules are connected to the frame 50 by arranging each of the plurality of support brackets 80 in abutment with a corresponding male chassis guiding element 70, here illustrated as vehicle frame support, of the first 52 and second 54 frame members. The male chassis guiding elements 10 are provided for supporting correct positioning of the first and second battery modules 2,3 as seen in the Y- direction, if needed . This is however an optional feature to the present disclosure.

[0071] Fig. 3 is a further illustration of the first and the second battery modules 2,3. The first battery module 2 comprises the set of battery packs 2a, 2b, 2c, 2d arranged side-by-side, as seen in the X-direction and the second battery module 3 also comprises the set of battery packs 3a, 3b, 3c, 3d arranged side-by-side, as seen in the X-direction. The respective set of battery packs 2a, 2b, 2c, 2d and 3a, 3b, 3c, 3d are each mechanically interconnected.

[0072] As shown in Figs. 2 and 3, the optional first male connecting element 4 may be connected to the outermost side 11 by means of a connecting portion 4a of the first battery module 2 while the male connecting element 4 projects from the connection side 20 of the first battery module 2.

[0073] In a corresponding manner, the optional first female connecting element 5 comprises a connection portion 5a which is attached to the outermost side 12 of the other one of the battery modules and wherein the first female connecting element 5 is aligned with the connecting side 30 of the second battery module 3, enabling connection with the first male connecting element 4.

[0074] The optional first male and female connecting elements 4,5 are furthermore preferably arranged at a comer portion of the respective connecting sides 20,30, here providing an extension of the respective connecting sides 20,30.

[0075] Furthermore, to support that an initial rough guiding is provided by the optional first male and female connecting elements 4,5, a length U of the first male connecting element 4 may be greater than a length k of the second male element(s) 6 and a length h of the third male elements 8, respectively, as measured from the connecting side 20 of the first battery module 20. The initial rough guiding may alternatively be provided by an optical alignment system of a first and second automated guided vehicle, AGV.

[0076] As may be seen from Fig. 3, a tip portion 4b of the optional first male connecting element 4 has a tapered shape, and a smaller cross-section than a base portion 4c of the first male connecting element 4. A technical benefit may include that there is a greater initial tolerance between the first connecting elements 4,5 which facilitates the initial connection while the precision increases when moving the battery modules 2,3 inwardly in the first and second lateral direction Y1 and Y2, the first and second lateral directions being opposing directions and parallel to the Y-direction of the chassis 50.

[0077] As illustrated in Figs. 4A and 6, a non-limiting method as disclosed herein, comprises guiding SI, optionally by means of an operator, the first and the second battery modules 2,3 inwardly towards the vehicle chassis 50, the first battery module 2 being moved laterally in a first direction Y1 towards the frame 50 and the second battery module being moved in a second lateral direction Y2 towards the frame 50 to set the Y-positioning of the battery modules 2,3 relative the vehicle chassis 50.

[0078] The method as disclosed herein, and illustrated in Figs. 4B, 4C and 6, furthermore comprises activating S2 a mechanical guiding for guiding the battery modules 2,3 inwardly towards the vehicle chassis 50 in the first and second lateral directions Y1,Y2 of the chassis 50 to the predetermined end position.

[0079] The mechanical guiding may optionally include a first rough guiding S2a, illustrated in Figs. 4B and 6, including the first male connecting element 4, provided on the connecting side 20 of the first battery module 2 and the matching first female connectingelement 5, provided on the connecting side 30 of the second battery module 3, and wherein the battery modules 2,3 are guided in the X- and Z-direction to a first relative position by connecting the first male connecting element 4 to the first female connecting element 5, the first male connecting element and the first female connecting element 4,5 having a first tolerance. Alternatively and as briefly indicated above but not illustrated in the figures, the first rough guiding is provided by an optical communication, e.g. using the above described optical alignment system, between the first and second battery module wherein the battery modules are aligned and guided in the X- and Z-direction to a first relative position.

[0080] As illustrated in Figs 4C and 6, the mechanical guiding furthermore includes a second finer guiding S2b for setting a predetermined X-positions of the battery modules 2,3, wherein at least one second male connecting element 6 is provided on the connecting side 20 of the first battery module 2 and at least one matching second female connecting element 7 is provided on the connecting side 30 of the second battery module 3, the second male connecting element 6 and the second female connecting element 7 having a second tolerance and wherein the second tolerance is greater in the Z-direction compared to the X- direction.

[0081] As illustrated in Figs 4C and 6, the mechanical guiding furthermore includes a third finer guiding S2c for setting a predetermined Z-position of the battery modules 2,3, wherein at least one third male connecting element 8 is provided on the connecting side 20 of the first battery module 2 and at least one matching third female connecting element 9 is provided on the connecting side 30 of the second battery module 3, and wherein the third male connecting element(s) 8 and the third female connecting element(s) 9 have a third tolerance and wherein the third tolerance between the third male and female connecting element(s) 8, 9 is greater in the X-direction compared to the Z-direction and wherein the battery modules are guided to the predetermined Z-position by aligning and connecting the third male connecting element(s) and the third female connecting element(s).

[0082] The second and the third guiding may be carried out simultaneously, which generally means that the lengths of the second male connecting element(s) 6 and the third male connecting element 8 are about the same, i.e. so that contact between the secondconnecting elements 6,7 and the third connecting elements 8,9, respectively is reached at the same time and thus the guiding and X- and Z-positioning of the battery modules 2,3.

[0083] With first, second and third “tolerance” herein may be meant the difference in cross-section between the respective male and female connecting elements, preferably as measured at a tip portion of the respective male connecting elements. Thus, for a large tolerance, the difference in cross-section between the male and female connecting elements is larger compared to a small tolerance. Tolerance may also be considered to mean a difference in extension between a male and corresponding female connecting element as measured along the same axis. Tolerance may mean the gap, or space, between a male and corresponding female connecting element as measured along one or more axes. The one or more axes may be substantially perpendicular to the longitudinal direction of the male and female connecting elements. The one or more axes may be substantially perpendicular to the direction in which the male connecting element is inserted into the female connecting element. A large tolerance may be considered to correspond to a larger gap between a male and corresponding female connecting element, as measured in one or more directions, compared to a small tolerance.

[0084] The male connecting element as disclosed herein may be a respective guiding pin and the female connecting elements may be a corresponding guiding aperture.

[0085] The method may optionally comprise a fourth guiding step (not shown) to set the position of the first and second battery modules 2,3 in a correct Y-position, wherein the chassis comprises male or female chassis guiding elements 10 as illustrated in Fig. 2.

[0086] According to an example of the present disclosure the method may include docking of a first and a second battery module 2,3 of an energy storage arrangement 1 to a respective side of a vehicle chassis with Automatic Guided Vehicle (AGV). This is carried out prior to the mechanical guiding illustrated in Figs.4A-4C, and can optionally be used for setting the above described first rough guiding.

[0087] As previously discussed, when docking a first and a second battery module 4,5, two heavy modules are coming from a respective lateral side of a chassis and needs to be assembled with high precision. The first and second battery modules 4,5 need to meettolerances both at module level and on a truck assembly line. The AGV may have limited accuracy, and to achieve the correct position with sufficient accuracy to be able to join the two sides together, additional guiding is preferably needed to force the respective battery module to meet in the correct position.

[0088] Figs. 5A-5C illustrates the method as disclosed herein and according to an example, wherein the method is for docking of the first and the second battery module 4,5 of the energy storage arrangement 1 to a respective side of a vehicle chassis, here illustrated by means of the frame 50, by means of AGV’s 110,111. The method comprising, as shown in Fig. 5A-5B; providing the first battery module 2 with a master AGV 110 and the second battery module 3 with a slave AGV 111 on a respective lateral side of the frame 50. The master AGV 110 may also be referred to as a first AGV, while the slave AGV 111 may be referred to as a second AGV. The first and second AGV may each comprise the above identified optical alignment system communicating with each other.

[0089] Furthermore, and as illustrated in Fig. 5B, the method includes synchronizing the speed SmAGv of the master AGV with the speed Scof the frame 50, and as illustrated in Fig. 5C to synchronize the speed SSAGV and the X-position, being the position as seen in the X- direction of the chassis, of the slave AGV 111 to the speed SmAGv of the master AGV 110.

[0090] After positioning of the first and second battery modules 2,3 by means of the automated vehicle guiding system, an operator performs a relative guiding of the AGV’s 110,111 inwardly towards the frame 50 in first and second lateral direction Y1,Y2, being parallel to a Y-direction of the frame 50 to set the Y-positioning of the AGV’s 110,111 relative the frame 50.

[0091] To set the final relative positions of the first and second battery modules 2,3, including connection of the first and second battery modules 2,3 at their respective connecting sides 20,30, activation of the mechanical guiding for guiding the AGV’s inwardly towards the vehicle chassis in the Y-direction of the chassis to the predetermined end position are performed as illustrated in Figs. 4A-4C.

[0092] The guiding of the AGV’s inwardly towards the vehicle chassis in a Y-direction of the chassis to set the Y-positioning of the AGV’s relative the vehicle chassis may be carried out by means of an operator of be means of automated guiding.

[0093] The terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises," "comprising," "includes," and / or "including" when used herein specify the presence of stated features, integers, actions, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, actions, steps, operations, elements, components, and / or groups thereof.

[0094] It will be understood that, although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the present disclosure.

[0095] Relative terms such as "below" or "above" or "upper" or "lower" or "horizontal" or "vertical" may be used herein to describe a relationship of one element to another element as illustrated in the Figures. It will be understood that these terms and those discussed above are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.

[0096] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in theart to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0097] It is to be understood that the present disclosure is not limited to the aspects described above and illustrated in the drawings; rather, the skilled person will recognize that many changes and modifications may be made within the scope of the present disclosure and appended claims. In the drawings and specification, there have been disclosed aspects for purposes of illustration only and not for purposes of limitation, the scope of the disclosure being set forth in the following claims.

Claims

ClaimsWhat is claimed is:

1. An energy storage arrangement (1), comprising a first battery module (2) and a second battery module (3) configured to be arranged on a respective side of a vehicle chassis (50), the first (2) and second (3) battery modules comprising a respective connecting side (20, 30) configured to face each other, wherein the first battery module comprises a second male connecting element (6) and a third male connecting element (8) arranged on the connecting side of the first battery module (2), wherein the second battery module (3) comprises a second female connecting element (7) and a third female connecting element (9) arranged on the connecting side of the second battery module (3), and wherein, during assembly of the first (2) and second (3) battery modules, the second male connecting element (6) is arranged to be guided into the second female connecting element (7) and the third male connecting element (8) is arranged to be guided into the third female connecting element (9).

2. The energy storage arrangement (1) of claim 1, wherein the second male connecting element (6) and the second female connecting element (7) has a second tolerance, and the third male connecting element (8) and the third female connecting element (9) has a third tolerance, the second and third tolerances being the same.

3. The energy storage arrangement (1) of claim 1, wherein the second male connecting element (6) and the second female connecting element (7) has a second tolerance, and the third male connecting element (8) and the third female connecting element (9) has a third tolerance, the second and third tolerances being different from each other.

4. The energy storage arrangement (1) of claim 3, wherein the second tolerance is greater in a vertical direction of the energy storage arrangement compared to a longitudinal direction of the energy storage arrangement.

5. The energy storage arrangement (1) of any one of claims 3 or 4, wherein the third tolerance is greater in a longitudinal direction of the energy storage arrangement compared to a vertical direction of the energy storage arrangement.

6. The energy storage arrangement (1) of any one of the preceding claims, wherein the first battery module comprises a first male connecting element arranged on the connecting side of the first battery module (2), wherein the second battery module comprises a first female connecting element arranged on the connecting side of the second battery module (2), the first male connecting element being guided into the first female connecting element during assembly of the first (2) and second (3) battery modules.

7. The energy storage arrangement (1) of claim 6 when dependent on any one of claims 3 or 4, wherein the first male connecting element and the first female connecting element has a first tolerance, the first tolerance being greater in a longitudinal direction of the energy storage arrangement compared to the second tolerance in the longitudinal direction of the energy storage arrangement.

8. The energy storage arrangement (1) of claims 6 or 7, wherein the first male connecting element and the first female connecting element has a first tolerance, the first tolerance being greater in a longitudinal direction of the energy storage arrangement compared to a vertical direction of the energy storage arrangement.

9. The energy storage arrangement (1) of any one of claims 6 - 8, wherein the first male connecting element is arranged at a longitudinal outer end position of the first battery module, and the first female connecting element is arranged at a longitudinal outer end position of the second battery module.

10. The energy storage arrangement (1) of claim 9, wherein the first male connecting element is arranged at a comer position of the connecting side of the first battery module at the longitudinal outer end position thereof, and wherein the first female connecting element is arranged at a comer position of the connecting side of the second battery module at the longitudinal outer end position thereof.

11. The energy storage arrangement (1) of any one of the preceding claims, wherein the first and second battery modules comprise a respective plurality of battery packs arranged side-by-side along a longitudinal direction of the energy storage arrangement.

12. The energy storage arrangement (1) of claim 11, wherein at least every other of the battery packs of the first and second battery modules comprises the corresponding third male and female connecting element.

13. A method of docking a first and a second battery module of an energy storage arrangement to each other on a respective side of a vehicle chassis, the method comprising:- guiding the first (2) and second (3) battery modules relatively towards each other in a lateral direction of the vehicle chassis, wherein guiding of the first and second battery modules comprises:- a second finer guiding for setting a predetermined longitudinal position of the first and second battery modules by guiding a second male connecting element of the first battery module and a second female connecting element of the second battery module into each other, the second male and female connecting elements being arranged on a connecting side of the respective first and second battery modules, and a third finer guiding for setting a predetermined vertical position of the first and second battery modules by guiding a third male connecting element of the first battery module and a third female connecting element of the second battery module into each other, the third male and female connecting elements being arranged on the connecting side of the respective first and second battery modules.

14. The method of claim 13, wherein the second finer guiding is preceded by:- a first rough guiding in which a first male connecting element of the first battery module and a first female connecting element of the second battery module are guided into to each other, the first male and female connecting elements being arranged on the connecting side of the respective first and second battery modules.

15. The method of claim 13, wherein the first and second battery modules being guided towards each other by using a first and a second automated guided vehicle, AGV.

16. The method of claim 15, wherein the first and second AGV each comprises an optical alignment system communicating with each other for guiding the first and second AGV to arrange the first and second battery modules to assume a relative vertical and longitudinal position.

17. A method for docking of a first and a second battery module (2,3) of an energy storage arrangement (1) on a respective side of a vehicle chassis (50), the vehicle chassis (50) extending in a Y-direction, an X-direction and a Z-direction, the method comprising; a) guiding the first and the second battery modules (2,3) inwardly towards the vehicle chassis (50) in a respective first and second lateral direction (Y1,Y2) to set the Y- positioning of the battery modules (2,3) relative the vehicle chassis (50), b) activating a mechanical guiding for guiding the battery modules (2,3) inwardly towards the vehicle chassis (50) in the first and second lateral directions (Y1,Y2) direction to the predetermined end position including; a first rough guiding, wherein a first male connecting element (4) is provided on a connecting side (20,30) of one of the battery modules (2,3) and a matching first female connecting element (5) is provided on a connecting side (30,20) of the other one of the battery modules (3,2) and wherein the battery modules (2,3) are guided in the X- and Z-direction to a first relative position by connecting the first male connecting element (4) to the first female connecting element (5), the first male connecting element (4) and the first female connecting element (5) having a first tolerance, alternatively, the first rough guiding is provided by an optical communication between the first and second battery module (2,3) wherein the battery modules (2,3) are aligned and guided in the X- and Z- direction to the first relative position; a second finer guiding for setting a predetermined X-positions of the battery modules (2,3), wherein at least one second male connectingelement (6) is provided on the connecting side (20,30) of one of the battery modules (2,3) and at least one matching second female connecting element (7) is provided on the connecting side (30,20) of the other one of the battery modules (3,2), the second male connecting element (6) and the second female connecting element (7) having a second tolerance and wherein the second tolerance is greater in the Z- direction compared to the X-direction; and a third finer guiding for setting a predetermined Z-position of the battery modules (2,3), wherein at least one third male connecting element (8) is provided on the connecting side (20,30) of one of the battery modules (2,3) and at least one matching third female connecting element (9) is provided on the connecting side (30,20) of the other battery module (3,2), and wherein the third male connecting element(s) (8) and the third female connecting element(s) (9) have a third tolerance and wherein the third tolerance between the third male and female connecting element(s) (8,9) is greater in the X-direction compared to the Z-direction and wherein the battery modules (2,3) are guided to the predetermined Z-position by aligning and connecting the third male connecting element(s) (8) and the third female connecting element(s) (9).

18. The method of claim 17, wherein the battery modules (2,3) comprise a set of third male (8) and a set of third female connecting elements (9), the sets of third male and female connecting elements (8,9) being aligned respectively, as seen in the X-direction.

19. The method of any of claims 17-18, wherein the battery modules (2,3) each comprises a plurality of battery packs (2a, 2b, 3c, 2d, 3a, 3b, 3c, 3d) arranged side-by-side, as seen in the X- direction, and wherein at least every other of the battery packs (2a, 2b, 3c, 2d, 3a, 3b, 3c, 3d) in the battery modules (2,3) comprises a third male or female connecting element (8,9), and wherein the third male or female connecting elements (8.9) are aligned with each other, as seen in the X-direction.

20. The method of any of claims 17 - 19, wherein the rough guiding is provided by the first male connecting element (4) being connected to an outermost side surface (11,12), extending in the Y-direction, of one of the battery modules (2,3) and the matching first female connecting element (5) being provided on an outermost side surface (11,12), extending in the Y-direction, of the other one of the battery modules (3.2).

21. The method of claim 20, wherein the first male and female connecting elements (4,5) are arranged at a corner portion of the respective connecting sides (11,12).

22. The method of any of claims 17 - 21, wherein a length (h) of the first male connecting element(s) (4) is greater than a length (kjs) of the second and third male elements (6,8), as measured from the connecting side (20,30) of the battery module (2,3).

23. The method of any of claims 17 - 22, wherein a tip portion (4b) of the first male connecting element(s) (4) has a smaller cross-section than a base portion (4c) of the first male connecting element (4c).

24. The method of any of claims 17 - 23, wherein the first tolerance is greater than the second tolerance, as measured in the X-direction.

25. The method of any of claims 17 - 24, wherein the first tolerance is greater than the third tolerance, as measured in the Z-direction.

26. The method of any of claims 17 - 25, wherein the second female connecting element(s) (7) comprises an oval or rectangular opening having a greatest extension in the Z-direction.

27. The method of any of claims 17 - 26, wherein the third female connecting element(s) (9) comprises an oval or rectangular opening having a greatest extension in the X-direction.

28. The method of any of claims 17 - 27, wherein the each one of the first and the second battery modules (2,3) comprises a plurality of battery packs(2a, 2b, 3c, 2d, 3a, 3b, 3c, 3d) arranged side-by-side and wherein the battery packs(2a, 2b, 3c, 2d, 3a, 3b, 3c, 3d) are mechanically interconnected to adjacent battery pack(s).

29. The method of any of claims 17 - 28, wherein the optical communication uses laser or infra-red light.

30. The method of any of claims 17 - 29, wherein the method is for docking of a first and a second battery module (2,3) of an energy storage arrangement (1) to a respective side of a vehicle chassis (50) with Automatic Guided Vehicle (AGV) (110,111), comprising a) providing the first battery module (2) with a master AGV (110) and the second battery module (3) with a slave AGV (111) on a respective side of the vehicle chassis (50); b) synchronizing a speed (SmAGv) of the master AGV with a speed (Sc) of the chassis (50); c) synchronizing a speed (SSAGV) and the X-position, being the position as seen in the X-direction of the chassis (50), of the slave AGV (111) to the speed (SmAGv) of the master AGV (110); d) guiding the AGV’s (110,111) inwardly towards the vehicle chassis (50) in a Y- direction of the chassis (50) to set the Y-positioning of the AGV’s (110, 111) relative the vehicle chassis (50), e) activating the mechanical guiding for guiding of the first and the second battery modules (2,3) inwardly towards the vehicle chassis (50) in the Y-direction of the chassis (50) to the predetermined end position.

31. The method of any of claims 17 to 29, wherein the method is a manual method carried out by one or more operators.

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