Cell holders for battery packs, battery packs, and electric bicycles

Abstract

The present invention relates to a cell retainer for a battery pack, particularly for an electric bicycle, comprising a generally hollow cylindrical wall that at least partially surrounds a cell receiving portion configured to receive a battery cell and including a retaining element disposed on the wall, wherein the external dimensions of the cell receiving portion are limited by the external dimensions of the battery cell, and wherein the retaining element extends radially into the cell receiving portion.

Description

Technical Field

[0001] The present invention generally relates to a cell retainer for a battery assembly, a battery assembly, and an electric bicycle. Background Technology

[0002] Battery assemblies for electric bicycles are known, comprising battery packs that typically have cell retainers holding multiple individual battery cells within them. These cell retainers provide mechanical protection and immobilize the battery cells. The cell retainers, along with the battery and other components, typically form the battery pack. The battery pack is often arranged within a housing. To protect the battery cells from damage, such as from potential drops or vibrations, it is generally necessary to ensure that the battery cells are immobilized. Typically, this cannot be achieved, or can only be limited to, the entire lifespan of the battery pack given the existing structures and materials. Summary of the Invention

[0003] In contrast, the advantage of the cell retainer according to the invention lies in its ability to provide a particularly reliable and robust immovable retention of the battery cell through a structure that can be simply and cost-effectively manufactured. This is achieved according to the invention: a cell retainer for a battery assembly, preferably for an electric bicycle, comprising a generally hollow cylindrical wall and a retaining element. The hollow cylindrical wall at least partially surrounds a cell receiving portion. The cell receiving portion is configured to receive, in particular, cylindrical battery cells. The retaining element is arranged on the wall. Here, the external dimensions of the cell receiving portion are substantially defined by the external dimensions of the battery cell. In particular, tolerances in the cell diameter and / or external dimensions of the cell receiving portion can be taken into account. Here, the retaining element protrudes radially and / or, in particular, extends radially outward into the cell receiving portion.

[0004] The wall also has a notch that extends along the cell housing. Specifically, the longitudinal extension along the cell housing corresponds to the battery housed within it. Here, the retaining element is preferably constructed as a single-sided spring arm, wherein the spring arm is fully connected to the wall on a first side in the circumferential direction and is delimited by the notch in the wall on a second side. In particular, the spring arm and the wall are constructed as a single integral component. Preferably, the spring arm is fully fused to the wall on both sides, especially on the first side in the circumferential direction and on the second side forming the base of the spring arm.

[0005] In particular, the cell receiving portion is constructed as a generally cylindrical cavity within which the battery cell can be arranged. Preferably, the cell receiving portion is at least partially surrounded only by a hollow cylindrical wall. This means that, preferably, the cell receiving portion is defined by the inner side of the hollow cylindrical wall. For example, the cell receiving portion may be open on one side, particularly in the axial direction, so that the battery cell can be arranged in and removed from the cell receiving portion.

[0006] In particular, the retaining element is constructed to protrude so much into the monomer receiving portion that the retaining element partially reduces the free space of the monomer receiving portion. Alternatively or additionally, the retaining element preferably extends outward.

[0007] In other words, a cell holder is provided, having a hollow cylindrical wall surrounding a cell receiving portion. An additional retaining element is provided on the wall, particularly on the inner side and / or outer side, protruding radially inward into the cell receiving portion. Therefore, the cell receiving portion is locally narrowed, thus locally restricting the position for the battery cell. Therefore, when the battery cell is received, i.e., during insertion, the retaining element is radially outwardly pushed away by the battery cell, thereby at least partially deforming the hollow cylindrical wall. Thus, a force is applied to the battery cell by means of the wall and the retaining element, which holds the battery cell immobile within the cell receiving portion. Alternatively or additionally, the retaining element preferably extends outward. Therefore, for example, clamping of the cell holder within a housing can be achieved, thereby providing a gapless and secure retention of the cell holder within the housing.

[0008] Therefore, the cell retainer offers the advantage of enabling particularly reliable and secure gapless retention of the battery cells within the cell housing. Through retaining elements directly arranged on the walls, the walls at least partially contribute to clamping the battery cells. Thus, dimensional tolerances of both the cell retainer and the battery cells can be compensated for, thereby ensuring reliable retention of the battery cells at all times.

[0009] The technical solution includes preferred extensions of the present invention.

[0010] Preferably, the retaining element is connected to the wall via an arcuate portion. In particular, the arcuate portion is arranged on the second side, especially on the surface where the foot of the spring arm is located. Alternatively, a ramp (phase) is preferably provided instead of the arcuate portion. Alternatively or additionally, the arcuate portion is preferably provided on the first side, i.e., especially in the circumferential direction. Therefore, the retaining element can be provided in the form of a curved, protruding area that continuously transitions to the wall. This can thus provide a particularly advantageous force distribution in which pressure peaks on the retaining element can be avoided through pressure-optimized geometry.

[0011] Particularly preferably, the single-unit retainer has a first retaining element and a second retaining element, wherein each of these two retaining elements is constructed as a single-sided spring element. Here, the first retaining element and the second retaining element are delimited in the circumferential direction by a common notch. Preferably, multiple first retaining elements and second retaining elements can be provided. This means that two different retaining elements are provided, which are arranged opposite each other in the circumferential direction on the common notch. Thus, a particularly simple, low-cost, and robust geometry of the single-unit retainer can be provided.

[0012] Preferably, the first retaining element protrudes radially into the cell holder, i.e., radially inward, and the second retaining element extends radially outward. Therefore, the first retaining element provides radial clamping of the battery cell within the cell housing, and the second retaining element, for example, provides radial clamping of the cell holder within the housing.

[0013] More preferably, the retaining element is arranged on the edge or shoulder of the wall. In particular, the retaining element is arranged on the boundary of the axial end face side, i.e., on the edge or shoulder. Therefore, the clamping of the battery cell can be provided close to its axial end, thereby achieving particularly reliable and secure clamping of the battery cell.

[0014] More preferably, the retaining element is formed through a recessed wall region or through a protruding wall region. Therefore, a particularly simple, low-cost, and robust structure for the single-unit retainer can be achieved.

[0015] Preferably, the wall and the retaining element are constructed as a single integral component. Therefore, the retaining element is also considered, in particular, as an inwardly projecting portion of the wall. This allows for a particularly simple, low-cost, and robust structure for the monolithic retainer.

[0016] Preferably, the retaining element is arranged on a predetermined wall region of the wall, wherein the wall region extends continuously over at least 20% of the circumference of the cell housing and at least 20% of its axial length. In other words, the retaining element is arranged on a continuous portion of the hollow cylindrical wall, which is continuous over a significant portion of the face of the cell housing, meaning that there are no interruptions, such as openings or cuts, or similar structures extending therefrom. This ensures that by arranging the battery cell within the cell housing, at least the wall region, i.e., the significant portion of the wall, deforms to allow a retaining force to be applied. In particular, this structure thus differs from, for example, an elastic tongue constructed as a narrow strip-shaped element, which is elastically retractable and can only be included in a small portion of the circumferential direction.

[0017] Particularly preferably, the cell retainer is designed such that a predetermined wall region is radially and elastically deformed outward by the battery cell arranged in the cell housing to apply a retaining force to the battery cell. This means that the wall region, in particular, with the retaining element, is constructed such that the wall region is elastically deformed radially outward by the battery cell when pushed in, i.e., pushed away. Therefore, the deformed wall region generates a retaining force, which is applied to the battery cell via the retaining element. Thus, it can be ensured particularly reliably and durablely that the battery cell is held securely and immovably by means of the retaining force.

[0018] Preferably, the retaining element has a generally rectangular geometry. This means that the retaining element has, in particular, a rectangular cross-section. Particularly preferably, the cross-section may be rectangularly constructed in a direction orthogonal to the axis of the cell housing and / or in a radial plane and / or in a plane orthogonal to the axis. Preferably, the retaining element has a planar, in particular rectangular, contact surface that faces radially inward and is specifically configured for contacting the battery cell.

[0019] Preferably, the retaining element has an axial length of at least 1 mm, preferably at least 3 mm, and especially at most 10 mm. Preferably, the retaining element has a width of at least 1 mm, preferably at most 5 mm, especially in the circumferential direction and / or in the tangential direction.

[0020] Particularly preferably, the retaining element has a height of at least 1 mm, especially in the radial direction. Particularly preferably, the maximum height of the retaining element is 3 mm. Therefore, it can be reliably ensured that the tolerances of the retainer and / or the battery cell can be reliably compensated while the battery cell is securely and gaplessly held in the cell retainer.

[0021] Preferably, the retaining element is fixed to the end face of the cell housing. In other words, the retaining element is preferably arranged directly adjacent to the end face of the cell housing. Therefore, a retaining force can be applied to the cell in the region near the end face of the cell.

[0022] More preferably, the wall of the cell retainer has a radial groove arranged radially outside the retaining element. In particular, the radial groove is constructed as a recess on the radially outer circumferential surface of the hollow cylindrical wall. Preferably, the groove extends at least 15% of the circumference of the wall, and more preferably at least 15% of the axial length of the wall. In particular, the groove has a depth of at least 0.5 mm, preferably a maximum of 2 mm, in the radial direction. The radial groove on the wall, radially outside the retaining element, allows free space for the wall to deform when the cell is inserted. This means that the radial groove provides free space within the retaining element region for elastic deformation of the wall without significantly increasing the external dimensions of the cell retainer. Therefore, for example, elastic deformation of the wall can be provided in the region of the retaining element by the retaining element without needing to enlarge or adapt the housing in which the cell retainer can be arranged to accommodate the deformation of the wall. This means that a particularly compact and space-saving, low-cost structure for the cell retainer and the housing in which the cell retainer can be arranged can be provided.

[0023] Preferably, the cell retainer further includes a first spring element configured to apply a first spring force to the cell when it is housed in the cell retainer. Therefore, in particular, an additional element is provided as a spring element capable of providing an additional force in the form of the first spring force to hold the cell in the cell retainer without gaps and immovably. This provides particularly reliable retention of the cell. Specifically, the spring element and the retaining element are arranged at different circumferential and / or axial positions of the cell housing.

[0024] Preferably, the first spring element and the wall are constructed as a single integral component. The first spring element extends circumferentially. In other words, the first spring element is preferably constructed as a tongue-shaped or tongue-like component that extends circumferentially. Specifically, the circumferential end of the spring element is constructed to be integrally connected to the hollow cylindrical wall. Preferably, the free ends of the spring element, facing each other circumferentially, are constructed to protrude radially inward into the cell housing in a non-load-bearing state. Therefore, the spring element can elastically deform, for example, by arranging the battery cell in the battery housing, such that the spring element applies a first spring force to the battery cell through its deformation. Therefore, particularly, the first spring element extends helically along the hollow cylindrical wall.

[0025] More preferably, the cell holder further includes a second spring element configured to apply a second spring force to the cell when it is housed in the cell holder. Preferably, the second spring element is integrally constructed with the wall. Particularly preferably, the second spring element extends in the axial direction. Therefore, in particular, another additional spring element is provided, which extends substantially in the axial direction. The second spring element can be constructed, for example, as an elongated, axially oriented tongue having a first axial end and a second axial end, one of which is integrally constructed with the hollow cylindrical wall. In particular, the second spring element protrudes radially into the cell housing in a non-load-bearing state, such that the second spring element elastically deforms by the arrangement of the cell in the cell housing, thus enabling the application of a second spring force to the cell. This provides for particularly reliable and non-movable retention of the cell in the cell holder.

[0026] The present invention also relates to a battery assembly including a battery pack. The battery pack includes a cell holder as described. The battery pack also includes at least one battery cell disposed in a cell receiving portion of the cell holder.

[0027] Preferably, the battery assembly further includes a housing in which the battery pack can be housed. The housing is specifically configured to protect the battery pack.

[0028] The present invention also relates to an electric bicycle, including the described battery assembly. Attached Figure Description

[0029] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the drawings: Figure 1 A simplified schematic diagram of an electric bicycle, featuring a battery assembly as shown in the example. Figure 2 : Figure 1 A perspective view of the battery assembly of an electric bicycle. Figure 3 : Figure 2 Exploded perspective view of the battery assembly. Figure 4 : Figure 2 Exploded perspective view of the battery assembly details. Figure 5 A simplified schematic diagram of a battery assembly, including a cell retainer according to a first embodiment of the present invention. Figure 6 : Figure 5 Detailed diagram of the single-cell retainer. Figure 7 : Figure 5Another view of the monomer retainer, Figure 8 : A perspective detail view of the single-unit retainer according to the second embodiment of the present invention. Figure 9 : Figure 8 Alternative view of the monomer holder Figure 10 Detailed view of the monomer holder according to the third embodiment of the present invention. Figure 11 Detailed view of the monomer holder according to the fourth embodiment of the present invention. Figure 12 Detailed view of the single-unit holder according to the fifth embodiment of the present invention. Figures 13 to 15 When assembling battery components, Figure 12 A simplified view of the single-unit retainer. Figure 16 A simplified view of the monomer holder during assembly according to the sixth embodiment. Figure 17 A perspective view of the battery assembly according to the sixth embodiment. Figure 18 : Figure 17 Detailed view of the single-unit retainer Figure 19 A simplified view of the monomer holder according to the eighth embodiment. Figure 20 A simplified view of the monomer holder according to the ninth embodiment. Figure 21 A simplified view of the monomer holder according to the tenth embodiment. Figure 22 A simplified view of the monomer holder according to the eleventh embodiment. Figure 23 : A perspective view of the monomer holder according to the twelfth embodiment. Figure 24 : Figure 23 A simplified view of the mechanical pressure on the monomer retainer. Figure 25 : A perspective view of the monomer holder according to the thirteenth embodiment. Figure 26 : Figure 25 Perspective view of the single-unit retainer during installation. Figure 27 A perspective view of the monomer holder according to the fourteenth embodiment of the present invention. Figure 28 : Figure 27 Alternative view of the monomer holder Figure 29 : Figure 27Detailed diagram of the cell retainer in the battery assembly state. Figure 30 : Figure 27 Details of the single-cell retainer.

[0030] Preferably, all identical components, elements and / or units are provided with the same reference numerals in all figures. Detailed Implementation

[0031] Figure 1 A simplified schematic diagram of an electric bicycle 100 is shown, featuring a battery assembly 10 according to an example. Detailed drawings of the battery assembly 10 of this example are shown below. Figures 2 to 4 As shown in the image.

[0032] The electric bicycle 100 includes a drive unit 101 with a motor, which is in particular an electric motor. The motor can be supplied with electrical energy stored in a battery assembly 10.

[0033] The drive unit 101 is arranged in the area of ​​the pedal bearing of the electric bicycle 100, and is therefore configured as a mid-mounted motor.

[0034] The motor torque generated by the motor can motorically support the pedaling force generated by the driver of the electric bicycle 100 through muscle force. The driver's muscle force can be applied here via a crank transmission device having crank 104.

[0035] The battery assembly 10 can be arranged inside the bicycle frame 105 of the electric bicycle 100. Specifically, the battery assembly 10 is housed inside the downtube of the bicycle frame 105.

[0036] The battery assembly 10 is essentially prismatic in structure and along the longitudinal direction 7 (see figure). Figure 2 (Extended.) In particular, the battery module 10 is constructed in a basically rectangular shape.

[0037] The battery assembly includes a housing 2 and a battery pack 1, which is arranged inside the housing 2.

[0038] The housing 2 can preferably be made of aluminum or an aluminum alloy, or alternatively of other metals. More alternatively, the housing 2 can also be made of plastic. Preferably, the housing 2 can be made of extruded profiles.

[0039] The axial end side of the housing 2 is closed by an end plate 14, which may be threaded to the housing 2, for example.

[0040] An electrical interface 12, configured for electrical connection with components of the electric bicycle 100 and / or with a charging device (not shown), is located on the first end plate 14. Preferably, the electrical interface 12 may be configured as a socket for connecting a plug (not shown).

[0041] A mechanical interface 13 is constructed on the same first end plate 14, which is configured to mechanically secure the battery assembly 10 to the bicycle frame 105. For example, the mechanical interface 13 may be configured to engage with another interface element of the bicycle frame 105 in a form-locking manner to thus position the battery assembly 10 on the bicycle frame 105.

[0042] Furthermore, the battery assembly 10 includes an input and / or output unit 11, which preferably includes a charging status display. Additionally, the input and / or output unit 11 may include, for example, a button. The charging status display can visually output the current charging status of the battery assembly 10 via LEDs, for example, in response to button operation.

[0043] Figure 3 An exploded perspective view of the battery assembly 10 in this example is shown.

[0044] The battery assembly 10 also includes a battery management system 15. The battery management system 15 preferably includes a microcontroller and has a control unit for the battery assembly 10, the control unit being configured to control and / or regulate the battery pack 1. The battery management system 15 may include a circuit board.

[0045] The battery management system 15 is electrically connected to the battery cells 6 of the battery assembly 10 and to the electrical interface 12.

[0046] The battery assembly 10 here comprises a large number of battery cells 6, preferably of the same construction. In particular, the battery cells 6 are constructed as cylindrical battery cells.

[0047] Multiple battery cells 6 are arranged side-by-side radially in a plane perpendicular to the longitudinal direction 7. In the example shown, eight battery cells are arranged side-by-side radially in a plane. Here, these battery cells 6 arranged axially in the same plane form a cell stack.

[0048] The battery assembly 10 comprises multiple cell stacks, and in the example shown, a total of five cell stacks. This means that six battery cells 6 are arranged aligned with each other in the axial direction.

[0049] The battery assembly 10 also includes a cell holder 4 configured to hold the battery cells 6 in a defined relative position to each other. In particular, the cell holder 4 has a plurality of individual cell accommodating portions configured to accommodate exactly one battery cell 6 each.

[0050] The individual retainer 4 can be constructed, for example, as a single piece, or alternatively, as in the example shown, as multiple pieces, having multiple retainers 4a. In the example shown, the individual retainer 4 has exactly one retainer 4a for each individual stack.

[0051] Axially, an intermediate plate 4b is arranged between adjacent retainers 4a. These intermediate plates 4b are exemplary made of a flame-retardant material.

[0052] The cell holder 4 preferably has at least one holding element 4c for each cell 6 (see reference). Figure 4 The retaining element 4c is configured for radial fixation and / or radial tolerance compensation of the battery cells 6 in their respective individual battery housings of the cell retainer 4.

[0053] The battery assembly 10 also preferably has a plurality of cell connectors 16 for each cell stack. The cell connectors 16 are preferably constructed as sheet metal parts and configured for electrical connection to the battery cells 6. Specifically, the cell connectors 16 can be electrically connected to the electrodes of the battery cells 6, preferably by means of a material-locking connection, such as a brazing connection or a fusion welding connection.

[0054] The individual connector 16 may also have electrical fuses, which may be configured as fuses.

[0055] Preferably, the single-cell connector 16 has a single-cell fuse 16a, which forms an electrical fuse for exactly one single battery cell 6.

[0056] Alternatively or additionally preferably, the individual connector 16 has individual stack fuses 16b, which in particular form an electrical fuse for an integral individual stack.

[0057] Figure 5 A perspective detail view of a battery assembly 10 having a single-cell retainer 4 according to a first embodiment of the present invention is shown. Figure 6 and 7 The middle shows Figure 5 Other details of the single-unit retainer 4.

[0058] Figures 5 to 7 The first embodiment relative to Figures 1 to 4The exemplary battery assembly 10 has the advantage of: improving the mechanical retention of the cell retainer 4 within the battery cell 6. This is achieved by special retaining elements 43, which improve the mechanical retention of the battery cell 6.

[0059] Here, the retaining element 43 is arranged on the hollow cylindrical wall 41 of the single retainer 4.

[0060] Here, a hollow cylindrical wall 41 defines a cell receiving portion 42 through its internal cylindrical free space, the cell receiving portion being surrounded by the wall 41. The cell receiving portion 42 is configured to receive a battery cell 6. Figure 5 The image shows a cell holder 4 having a battery cell 6 arranged in a cell housing 42. Figure 6 This shows the empty state of the cell holder 4 without the battery cell 6.

[0061] Here, the retaining element 43 is arranged on the inner side of the wall 41 and extends radially inward into the cell receiving portion 42. Specifically, the retaining element 43 protrudes radially into the cell receiving portion 42 such that the space available for use by the battery cell 6 is locally reduced by the retaining element 43.

[0062] The retaining element 43 is constructed as an integrated component of the wall 41 of the single retainer 4. Here, the retaining element 43 is located in the region of the end face side end with respect to the longitudinal direction 70 of the single receiving portion 42 of the wall 41.

[0063] In particular, the retaining element 43 is arranged on a specific wall region 44 of the wall 41. The wall region 44 is... Figure 5 and 6 The area shown in dashed lines is the wall region 44, which is a completely continuous area of ​​wall 41 without openings, gaps, or similar features. This means that the entire wall region 44 is made of solid material.

[0064] Here, the retaining element 43 has a generally rectangular geometry. Specifically, the retaining element 43 has a rectangular cross-section in each cross-sectional plane. Here, the retaining element 43 extends parallel to the longitudinal direction 70 in the longitudinal direction. Therefore, there is a rectangular contact surface with the battery cell 6.

[0065] Here, the retaining element 43 has a height 43a, which is at least 1 mm in the radial direction. Therefore, the retaining element 43 reliably causes the wall region 44 to elastically deform radially outward when the battery cell 6 is arranged, and in particular pushed into, the cell receiving portion 42. This means that the retaining element 43 protrudes radially into the cell receiving portion 42, thereby pushing the retaining element and therefore the wall region 44 radially outward, whereby the wall region 44 also elastically deforms radially outward. Through this deformation, a retaining force 45 is applied to the battery cell 6 by the wall region 44 and the retaining element 43.

[0066] By ensuring that the height 43a is at least 1 mm, it is reliably ensured that the deformation and holding force 45 are reliably induced under normal tolerance conditions. This is exemplarily based on... Figure 7 It is shown here. Figure 7 The diagram shows two different cell housings 42 and two different battery cells 6.

[0067] Here, in Figure 7 The left side shows a large tolerance, namely the large deviation between the external dimension 42a of the cell housing 42 and the external dimension 6a of the cell 6. Figure 7 The right side shows a very small deviation. Different deviations can be caused, for example, by tolerances that occur during the manufacture of the cell holder 4 and / or the cell 6.

[0068] By designing the cell retainer 4 and retaining element 43 accordingly, it is ensured in all cases within the increased minimum and maximum tolerances that contact occurs between the cell 6 and the retaining element 43 by inserting the cell 6 into the cell receiving portion 42, i.e., the retaining element 43 elastically deforms radially outward with the wall region 44 of the wall 41, so as to apply a retaining force 45 to the cell 6.

[0069] Therefore, a particularly reliable and robust gapless retention of the battery cell 6 can be achieved by means of the cell retainer 4. The entire wall region 44 is used to forcefully lock the battery cell 6 with the help of the retaining force 45, which ensures that the secure clamping retention is particularly reliable over the long service life of the battery assembly 10.

[0070] Additionally, the cell retainer 4 includes a second spring element 48, configured to apply a second spring force 48a to the cell 6 when the cell 6 is arranged in the cell receiving portion 42. Here, the second spring force 48a is radially oriented. The second spring element 48 is integrally constructed with the wall 41 and extends axially as a tongue. In particular, the second spring element 48 may be constructed with axially opening slots (Freischnitte), i.e., through holes, on both sides of the spring element 48 to provide elastic relief and preload in the radial direction.

[0071] Figure 8 A perspective detail view of the monomer holder 4 according to a second embodiment of the present invention is shown. Figure 9 The middle shows Figure 8 An alternative view of the single-unit holder 4. The second embodiment is substantially corresponding to... Figures 5 to 7 The first embodiment differs in that radial grooves 46 are additionally provided on the radially outer side of the wall 41 of the single retainer 4 in the region of the retaining element 43.

[0072] Specifically, the groove 46 is constructed as a recess on the outer side of the wall 41 of the cell retainer 4. Here, the groove 46 extends substantially throughout the radially outwardly deformed portion of the wall 41 in both the axial and circumferential directions. In particular, the groove 46 extends through at least 20% of the entire circumference of the wall 41. Preferably, the groove 46 further extends through at least 10% of the axial length of the wall 41.

[0073] Preferably, the radial groove 46 has a depth 46a in the radial direction, particularly in the region directly adjacent to the retaining element 43, which corresponds to at least 30%, preferably at least 50%, of the thickness of the wall 41.

[0074] Here, the radial groove 46 provides the advantage of providing a location for deformation of the wall 41 with the retaining element 43. This means that the radially outward deformation of the retaining element 43 and the wall 41 caused by pushing in the battery cell 6 can be carried out within the free mounting space available through the groove 46. Therefore, in particular, the surrounding housing 2 can be used without modification compared to a cell retainer without such a groove 46. This means, for example, from in Figures 1 to 4 The example shown demonstrates that no additional gap or free space needs to be provided between the cell retainer 4 and the housing 2 by modifying the housing 2. Therefore, a particularly simple, cost-effective, and space-saving battery assembly 10 can be provided. Furthermore, the wall 41 can be specifically designed to provide elasticity and thus a retaining force 45 through the groove 4, particularly through the appropriate design of its depth 46a.

[0075] Figure 10 A perspective detail view of a battery assembly 10 having a cell retainer 4 according to a third embodiment of the present invention is shown. The third embodiment is substantially the same. Figure 8 and 9 The second embodiment differs in that an additional first spring element 47 is added.

[0076] The first spring element 47 is configured to apply a first spring force 47a to the battery cell 6 when the battery cell 6 is housed in the cell receiving portion 42 of the cell holder 4.

[0077] Here, the first spring element 47 and the wall 41 are constructed as an integral component. Here, the first spring element 47 extends in a substantially helical shape along the circumferential direction. In particular, the first spring element 47 can be constructed through a gap extending in the circumferential direction within the wall 41.

[0078] Here, the first spring element 47 forms another element of the cell holder 4, which causes or supports the retention of the battery cell 6. In particular, the first spring element 47 and the retaining element 43 are arranged at different circumferential positions in the cell receiving portion 42. Therefore, retaining force can be applied to the battery cell 6 from different directions. Thus, even if one of the spring elements 47, 48 or the retaining element 43 fails, reliable and gapless retention of the battery cell 6 in the cell holder 4 can still be ensured.

[0079] Figure 11 A detailed view of a battery assembly 10 having a cell retainer 4 according to a fourth embodiment of the present invention is shown. The fourth embodiment substantially corresponds to... Figure 10 The third embodiment differs in that the single-unit retainer 4 has two first spring elements 47.

[0080] The two first spring elements 47 are arranged at different circumferential positions on the cell holder 4 such that, correspondingly, the first spring force 47a is applied to different circumferential positions on the cell 6. Therefore, particularly reliable retention of the cell 6 can be achieved because the spring force 47a and the retaining force 45 can be applied to the cell 6 from different directions.

[0081] Here, the two first spring elements 47 are constructed differently. Specifically, the two spring elements 47 may have different lengths along the circumferential direction. Therefore, different spring forces 47a can be applied to the battery cell 6, thereby, for example, efficiently and reliably damping or compensating for vibrations and oscillations of different frequencies.

[0082] Figure 12 A simplified schematic diagram of the monomer holder 4 according to the fifth embodiment is shown. Figures 13 to 15 The middle shows Figure 12 A highly simplified schematic diagram of the single-unit retainer 4.

[0083] The fifth embodiment of the single-unit holder 4 is relative to Figures 1 to 4The cell retainer 4 of the example battery assembly 10 is characterized by allowing improved flexible retention of the battery cells 6. Specifically, the battery retainer 4 of the fifth embodiment has the advantages of ensuring particularly high tolerance compensation, and furthermore, the battery cells 6 can be mechanically and reliably fixed to the cell retainer 4. Therefore, improved robustness of the battery assembly 10 and improved rigidity of the battery pack 1 are provided. In addition, savings in required installation space can be achieved, especially in the radial direction. Furthermore, less material and a smaller weight of the cell retainer 4 can be achieved. By clamping the battery cells 6 particularly uniformly around the circumference of the battery cells, the probability of tearing or cracking of the sidewalls of the battery cells 6, for example, in the event of internal defects in the battery cells, can be reduced.

[0084] This is achieved by a single-unit retainer 4, which is constructed in at least two pieces along the longitudinal direction 70, having a first single-unit retainer component 51 and a second single-unit retainer component 52. Preferably, the two single-unit retainer components 51, 52 may be at least substantially identical in construction, as shown in the fifth embodiment. Alternatively, it is preferable that the two single-unit retainer components 51, 52 may be constructed differently.

[0085] In the fifth embodiment, the single-unit retainer 4 is constructed such that by axially fitting the two single-unit retainer components 51, 52 onto each other, as in... Figure 13 As indicated by arrow A, the interlocking structure 53 of the cell holder 4 automatically performs radial clamping between the cell holder 4 and the battery cell 6. This radial clamping is achieved by reducing the inner diameter of the corresponding cell holder components 51 and 52, that is, by reducing the outer dimension 42a of the cell receiving portion 42 (see [link to diagram]). Figure 12 ).

[0086] To achieve the reduction in diameter, each individual retainer component 51, 52 has multiple axial slots 54 along the circumferential direction. For each individual retainer component 51, 52, the slots 54 are evenly distributed around the circumference.

[0087] Here, along the circumferential direction, a slot 54 is alternately constructed from one of the two axial end faces of each individual retainer component 51, 52.

[0088] Here, each slot 54 extends over at least 30%, preferably up to 80%, of the axial length of its respective unit retainer component 51. In particular, this provides a generally serrated structure for each unit retainer component 51, 52 along the circumferential direction.

[0089] For each slot 54, each individual retainer component 51, 52 has a protruding insert element 53a symmetrically relative to the slot 54. Here, each protruding insert element 53a protrudes axially from the end face side of the individual retainer component 51, 52.

[0090] Each protruding insert element 53a has a geometry that tapers from the base of the individual retainer components 51, 52. In particular, each protruding insert element 53a has a V-shaped, preferably trapezoidal, geometry.

[0091] Furthermore, each individual retainer component 51, 52 has a notch 53b constructed on the corresponding opposing individual retainer component 51, 52 for the protruding insert element 53a. Here, each notch 53b extends axially from the axial end face side into the base region of the individual retainer component 51, 52. Each notch 53b has a geometry that tapers towards the center of the individual retainer 51, 52 in the axial direction. In particular, each notch 53b has a V-shaped, preferably trapezoidal, geometry.

[0092] The width of each notch 53b, especially relative to the circumferential direction, is smaller than the width of the corresponding protruding insert element 53a.

[0093] The interlocking structure 53 of the unit retainer 4 is constructed such that the axial engagement of the unit retainer components 51 and 52 with each other causes the groove 54 to contract by interlocking the protruding interlocking element 53a into the notch 53b, as per [the provided text]. Figures 13 to 15 As shown. In this case, the two individual retainer components 51, 52 engage with each other until their end faces abut against each other. In the fifth embodiment shown, the slot 54 is substantially completely offset (see...). Figure 15 Alternatively, it is preferable to retain a slightly open groove 54 even when fully engaged.

[0094] The engagement of the cell holder components 51 and 52 and the associated reduction in the groove 54 cause a reduction in the inner diameter of the cell holder 4 and consequently a reduction in the outer dimension 42a of the cell receiving portion 42. Therefore, the cell 6 is fully clamped by the cell holder 4 and thus mechanically fixed. This allows for particularly uniform mechanical retention on the outer surface of the cell 6.

[0095] Figure 16 A simplified schematic detail diagram of the monomer holder 4 according to the sixth embodiment is shown. The sixth embodiment substantially corresponds to... Figures 12 to 15 The fifth embodiment differs in that the configuration of the interlocking structure 53 is replaced. In the sixth embodiment, the interlocking structure 53 is additionally provided with a locking structure that allows the interlocking structure 53 to engage.

[0096] Specifically, the protruding engaging element 53a has locking hooks 53c on both sides. The locking hooks 53c can be engaged when the individual retainer components 51 and 52 are fully axially pushed together (in... Figure 16 (Completely below) is inserted into the locking notch 53d of notch 53b.

[0097] By engaging the locking hook 53c with the locking notch 53d, the axial detachment of the cell retainer components 51 and 52 can be prevented. This avoids, for example, the need for force, clamping, or similar means to hold the two cell retainer components together in the axial direction. Thus, a particularly simple and reliable clamping function for holding the battery cell 6 can be achieved.

[0098] Figure 17 A perspective view of a battery pack 1 showing a battery assembly 10 having a cell retainer 4 according to a seventh embodiment is shown. Figure 18 The figure shows a detailed cross-sectional view of the monomer holder 4 of the seventh embodiment.

[0099] and Figures 1 to 14 Unlike the previous example, the seventh embodiment is characterized in that the battery cell 6 is better held within the cell holder 4.

[0100] The seventh embodiment of the single-unit holder 4, except for the holding element 4c (see Figure 4 In addition to the above, each battery cell 6 or cell housing 42 additionally has an additional second retaining element 61 (see below). Figure 18 Here, each second retaining element 61 is arranged in a different circumferential position on the corresponding single-unit receiving portion 42, and additionally in a different axial position.

[0101] Specifically, the retaining element 4c is substantially arranged on the axial end face side of each unit housing 42. The second retaining element 61 is arranged here, in particular, between the axial center of the unit housing 42 and the end face side. Preferably, each second retaining element 61 is arranged within the middle third of the axial length of the unit housing 42.

[0102] Therefore, by applying an additional holding force radially to the battery cell 6, reliable and stable holding of the battery cell 6 can be achieved.

[0103] Preferably, the first retaining element 4c and the second retaining element 61 of each cell housing 42 are designed differently. In particular, one of the retaining elements 4c and 61 is designed for the smallest cell diameter tolerance, while the other retaining element 4c and 61 is designed for the largest cell diameter tolerance. Therefore, battery cells 6 with different tolerances can be held particularly reliably within the entire battery pack 1.

[0104] Preferably, the second retaining element 61, as in Figure 18 As can be seen, the spring element is constructed to protrude radially inward, and the spring element is constructed to be elastically retractable. By joining the battery cell 6 into the cell receiving portion 42, the second spring element 61 deforms radially outward, thereby applying a spring force radially inward to the battery cell 6.

[0105] Figure 19 A highly simplified diagram showing details of the monomer holder 4 according to the eighth embodiment is provided. Distinguished from... Figures 1 to 4 In this example, the eighth embodiment has the advantage of improving the clamping of the battery cell 6 within the cell holder 6. This is achieved through a clamping structure 71 between the different holder components 4a of the cell holder 4.

[0106] Specifically, each retainer component 4a has a first clamping element 72 between radially adjacent battery cells 6, the first clamping element being configured as a recess that extends substantially axially between the two battery cells 6 and is open on one side. In particular, the first clamping element 72 can therefore be substantially configured as a blind hole.

[0107] Additionally, each retainer component 4a has a second clamping element 73 configured to be aligned axially with the first clamping element 72 and configured to protrude axially from the retainer component 4a. In particular, each second clamping element 73 is configured as a protruding pin, preferably having a guide ramp 73a.

[0108] Here, the clamping structure 71 is constructed such that, when assembling the individual retainer 4, each second clamping element 73 is axially engaged with a first clamping element 72 by axially engaging the retainer parts 4a with each other.

[0109] Here, there is an interference fit between the first clamping element 72 and the second clamping element 73. Therefore, the wall of the retainer member 4a surrounding the second clamping element 72 expands radially and thus presses against the battery cell 6, which is radially adjacent to it. Thus, through the axial engagement of the retainer member 4a, the battery cell 6 is radially clamped by the deformation of the wall of the cell retainer 4 and is therefore mechanically fixed in place. Therefore, reliable and secure fixing of the battery cell 6 can be achieved, particularly along a large portion of its axial length.

[0110] Figure 20 A simplified schematic diagram showing details of the monomer holder 4 according to the ninth embodiment is provided. The ninth embodiment substantially corresponds to... Figure 19 The eighth embodiment differs in that the second clamping element 73 has a fixed alternative configuration. Figure 20In the ninth embodiment, each second clamping element 73 is hollow inside. This means that each second clamping element 73 has a notch 73b inside.

[0111] Therefore, each second clamping element 73 has increased flexibility. This means that the second clamping element 73 can be constructed, for example, with thin walls, such that the walls can slightly recoil radially, for example by... Figure 20 As shown by the dotted lines. Preferably, the wall thickness of the second retaining element 73 is precisely designed so that a predetermined radial clamping force can be applied to the battery cell 6.

[0112] Alternatively or additionally, alternative, weakened structural elements may be provided in the second clamping element 73 to provide desired mechanical clamping characteristics, such as the defined slit of the second retaining element 73.

[0113] Figure 21 A simplified schematic detail diagram of the monomer holder 4 according to the tenth embodiment is shown. The tenth embodiment is substantially the same as... Figure 19 The eighth embodiment differs in that a first clamping element 72 and a second clamping element 73 are provided on both sides and in both directions on each retainer component 4a.

[0114] In particular, a first clamping element 72 and a second clamping element 73 are arranged radially side by side on each retainer part 4. The corresponding opposing first and second clamping elements 72 and 73 of the other retainer part 4a can be interlocked with each other and provide radial clamping to clamp the battery cell 6 in the radial direction.

[0115] Figure 22 A highly simplified schematic diagram of a battery pack having a cell holder according to the eleventh embodiment is shown. The eleventh embodiment differs from... Figures 1 to 4 The example has the following advantages: it enables tolerance compensation and keeps the battery cell 6 particularly reliably and immobile within the battery pack 1.

[0116] This is achieved by a cell retainer 4 having a pre-tightening element 81 that applies a pre-tightening force to the cell 6 when the battery pack 1 is pushed into the housing 2, so that the cell is immovably clamped in the cell retainer 4.

[0117] In particular, the cell retainer 4 has exactly one preload element 81 for each cell 6. Here, the preload element 81 is arranged radially next to one side of the corresponding cell 6.

[0118] exist Figure 22In the illustrated embodiment, the preload element 81 is configured as a localized area of ​​the cell retainer 4 that is convexly bent toward the cell 6.

[0119] On the side of the battery cell 6 opposite to the pre-tightening element 81, the cell holder 4 may have a straight wall 82.

[0120] The preload element 81 is designed such that it can cover the entire tolerance range of the battery cell 6. In particular, the preload element 81 undergoes a certain elastic deformation when the battery pack 1 is pushed into the housing, not only under the minimum tolerance condition but also under the maximum tolerance condition.

[0121] Therefore, a radial clamping force is applied to each battery cell 6 when the battery pack 1 is pushed into the housing 2. Thus, in addition to tolerance compensation, the battery cells 6 can be reliably and immovably secured in the cell holder 4 at all times. Furthermore, additional vibration damping can be achieved, for example, through the deformability of the retained preload element 81, thereby achieving particularly reliable and stable retention of the battery cells 6.

[0122] Figure 23 A perspective view showing details of a battery assembly 10 having a cell holder 4 according to the twelfth embodiment. Figure 24 The image shows a stress-strain diagram 90 of the retaining element 4c of the monomer retainer 4 according to the twelfth embodiment. The twelfth embodiment is relative to... Figures 1 to 4 The example has the following advantages: it can provide a particularly reliable constant holding force in all operating states and throughout the entire life cycle of the battery assembly 10.

[0123] This is achieved by the retaining element 4c of the cell retainer 4 being specifically designed with a special geometry and material such that the retaining element applies a constant clamping force to the cell 6 when the battery assembly 10 is fully assembled.

[0124] This is achieved by having at least element 4c, and especially the entire monomer retainer 4, made of a malleable material, especially malleable plastic, preferably polycarbonate.

[0125] Furthermore, the retaining element 4c is preferably constructed such that it plastically deforms by pushing the battery cell 6 into the cell holder 4. This means that the retaining element 4c deforms upon initial assembly of the battery cell 6 such that plastic deformation occurs at least in a portion of the retaining element 4c. This is based on... Figure 24 To be explained.

[0126] Here, Figure 24The stress 91 associated with strain 92 is shown for the exemplary retaining element 4c. Here, curve 95 forms a stress-strain curve. Dashed line 93 indicates a constant stress level.

[0127] Here, the retaining element 4c is designed such that, after initial assembly, i.e., after the battery cell 6 is arranged in the cell retainer 4, the stress-strain level of the retaining element is within the marked region 94. This region 94 is clearly after the region 96 of elastic deformation. Therefore, according to Figure 90, a constant stress level is provided in the retaining element 4c even with increased strain. This means that when, for example, a larger battery cell 6 is inserted into the cell retainer 4, the strain 92 in the retaining element 4c increases, while the stress 91 remains substantially constant. Therefore, the retaining force on the battery cell 6 remains substantially constant over time, even with different cell diameters.

[0128] Preferably, the holding force exerted by the holding element 4c on the battery cell 6 can be designed by specifically designing the geometry of the holding element 4c, for example by the width, thickness, and length of the spring arm of the holding element 4c. Preferably, the stiffness of the holding element 4c can also be specifically affected by adding other materials, such as glass fiber, to provide the desired holding force.

[0129] To provide reliable retention force even after prolonged use, the creep model of the retention element 4c is additionally considered when designing the retention element 4c. This offers the advantage of particularly low creep tendency, especially when using polycarbonate or polycarbonate-doped mixtures.

[0130] Figure 25 A perspective view of the monomer holder 4 according to the thirteenth embodiment is shown. Figure 26 The middle shows having Figure 25 The battery pack 1 with individual cell holders is in the state during assembly.

[0131] and Figures 1 to 4 Unlike other examples, the cell holder 4 in the thirteenth embodiment has the advantage of providing a particularly uniform and secure fixation of the battery cells 6. Here, immovable retention and reliable tolerance compensation can be achieved.

[0132] This is achieved by a cell retainer having a long slot 49 on each retainer component 4a, the long slot starting from the cell receiving portion 42, extending completely through the cell retainer 4 in the radial direction, and extending along the entire axial length of the cell receiving portion 42. This means that the cell retainer 4 is constructed to be slotted along the entire axial length of the cell receiving portion 42 on each cell 6.

[0133] Specifically, the cell holder 4 is constructed such that upon insertion of the battery cell 6, the cell holder 4 expands radially and elastically deforms, thereby applying a holding force 102 to the battery cell 6 in the radial direction. In particular, an interference fit is thus formed between the battery cell 6 and the undeformed cell holder 4.

[0134] Therefore, it is possible to achieve that the cell retainer 4 applies a retaining force 102 to the cell 6 particularly uniformly and at all times in the radial direction, at least in part of the axial length of the cell 6 and at least in part of the circumferential direction of the cell 6, so as to securely and without gaps.

[0135] exist Figure 26 The diagram illustrates the steps during assembly of a battery assembly 10 with a cell holder 4 according to the thirteenth embodiment. Here, as in... Figure 26 As can be seen, the retainer component 4a of the cell retainer 4 consists of two separate components 4m and 4n, which can be joined to each other in the axial direction. During assembly, the battery cell 6 is first pushed into the lower component 4m of the retainer component 4a. Then, the upper component 4n is axially fitted onto the battery cell 6, as indicated by arrow C.

[0136] Preferably, the components 4m and 4n of the retainer component 4a are internally tapered on corresponding sub-regions of the cell receiving portion 42, particularly preferably tapered. Specifically, the tapering proceeds from the center toward the axial end face side of the battery cell 6. Therefore, the push-fitting of components 4m and 4n and the battery cell 6 can be performed in a particularly simple and easy manner, wherein expansion and thus preload are reliably provided by the tapering and the elongated slot 49.

[0137] Figure 27 A perspective view of the monomer holder 4 according to the fourteenth embodiment of the present invention is shown. Figures 28 to 30 The middle shows Figure 27 Other details of the single-unit retainer 4.

[0138] The fourteenth embodiment is basically corresponding to Figures 5 to 7 The first embodiment differs in that the replacement configuration of the retaining element 43 is maintained.

[0139] Here, the retaining elements 43 are respectively constructed as spring arms 43b. Along the circumferential direction 41a of the wall 41, each spring arm 43b is fully connected to the wall 41 on a first side 43c, and is delimited by a notch 41b on a second side 43d opposite to the first side 43c along the circumferential direction 41a (see especially). Figure 30 ).

[0140] The notch 41b is constructed here as a long slot that completely penetrates the wall 41 in the radial direction.

[0141] Here, retaining element 43 is arranged on the edge or shoulder of wall 41. In particular, notch 41b is constructed to be open on one side along the longitudinal direction 70.

[0142] Furthermore, the retaining element 43 is formed through the recessed wall region of the wall 41 or, alternatively, through its protruding wall region.

[0143] On the outermost monomer receiving portion 42 of the monomer holder 4 in the radial direction (see...) Figure 28 The individual retainer here has two different retaining elements 43, namely a first retaining element 43f and a second retaining element 43g. These different retaining elements 43f and 43g are each constructed as a single-sided spring wall 43b and are delimited by the same common notch 41b (see [link to relevant documentation]). Figure 30 ).

[0144] Here, the first retaining element 43f is constructed such that it protrudes radially into the unit receiving portion 42. The second retaining element 43g is constructed such that it extends radially outward.

[0145] In particular, each single-sided spring arm 43b is constructed such that the spring arm protrudes or extends to its maximum extent in the radial direction on the second side 43d of its adjacent notch 41b. In particular, each spring arm 43 is therefore constructed as a curved element that protrudes or extends further, particularly in the radial direction.

[0146] Here, each retaining element 43 is connected to the wall 41 via an arcuate portion 43e. In particular, an arcuate portion 43e is also provided at the bottom of the notch 41b (see...). Figure 30 Here, each arc portion 43e causes a particularly continuous transition, thereby providing an optimal pressure structure for the unit retainer 4. This means that pressure peaks at the transition between the wall 41 and the retaining element 43 and / or at the bottom of the notch 41b can be effectively reduced.

[0147] Here, the retaining element 43, configured as spring arm 43b, provides the advantage of providing a particularly reliable, secure, and gapless clamping of the battery cell 6 and the cell holder 4. Here, the battery cell 6 is held gaplessly within the corresponding notch 42 of the cell holder 4 by means of the radially inwardly projecting first retaining element 43f. Furthermore, the cell holder 4 is clamped and held within the housing 2 by means of a retaining force 45c by means of the radially outwardly projecting second retaining element 43g (see [link to housing 2]). Figure 29 ).

Claims

1. A cell retainer for a battery pack (1), particularly for an electric bicycle (100), comprising: - A basically hollow cylindrical wall (41), said wall at least partially surrounding a cell housing (42), said cell housing being configured to accommodate a battery cell (6), and - Retaining element (43), said retaining element is arranged on said wall (41), -The external dimension (42a) of the cell holder (42) is defined by the external dimension (6a) of the cell (6), and - wherein the retaining element (43) protrudes radially and / or extends into the monomer receiving portion (42), -The wall (41) has a notch (41b) that extends along the single-unit receiving portion (42). -The retaining element (43) is configured as a spring arm (43b), wherein the spring arm (43b) is fully connected to the wall (41) on a first side (43c) in the circumferential direction of the wall (41) and is delimited by the notch (41b) on a second side (43d).

2. The monomer holder according to claim 1, wherein, The retaining element (43) is connected to the wall (41) via an arc portion (43e).

3. The monomer holder according to any one of the preceding claims, wherein, The single-unit retainer (4) has a first retaining element (43f) and a second retaining element (43g), the retaining elements being constructed as a single-sided spring arm (43b), wherein the retaining elements (43f, 43g) are delimited in the circumferential direction (41a) by the same notch (41b).

4. The monomer holder according to claim 3, wherein, The first retaining element (43f) protrudes radially into the monomer receiving portion (42) and the second retaining element (43g) extends radially outward.

5. The monomer holder according to any one of the preceding claims, wherein, The retaining element (43) is arranged on the edge or shoulder of the wall (41).

6. The monomer holder according to any one of the preceding claims, wherein, The retaining element (43) is formed by a recessed wall region or a protruding wall region.

7. The monomer holder according to any one of the preceding claims, wherein, The wall (41) and the retaining element (43) are constructed as an integral component.

8. The monomer holder according to any one of the preceding claims, wherein, The retaining element (43) is arranged on a predetermined wall region (44) of the wall (41), wherein the wall region (44) extends continuously over at least 20% of the circumference of the unit housing (42) and over at least 20% of the axial length of the unit housing.

9. The monomer holder according to claim 8, wherein, The cell holder (4) is designed such that the wall region (44) is elastically deformed radially outward by the cell (6) housed in the cell housing (42) to apply a holding force (45) on the cell (6).

10. The monomer holder according to any one of the preceding claims, wherein, The wall (41) has a radial groove (46) arranged radially outside the retaining element (43).

11. The cell holder according to any one of the preceding claims further includes a first spring element (47) configured to apply a first spring force (47a) to the cell while the cell (6) is housed in the cell holder (4).

12. The monomer holder according to claim 11, wherein, The first spring element (47) and the wall (41) are constructed as an integral component, wherein the first spring element (47) extends in the circumferential direction.

13. The cell holder according to any one of the preceding claims further includes a second spring element (48), the second spring element being configured to apply a second spring force (48a) to the cell while the cell (6) is housed in the cell holder (4), in particular, wherein, The second spring element (48) and the wall (41) are constructed as an integral component, and preferably the second spring element (48) extends in the axial direction.

14. A battery assembly comprising a battery pack (1), the battery pack including a cell holder (4) according to any one of the preceding claims and including at least one battery cell (6), wherein, The battery cell (6) is arranged in the cell receiving portion (42) of the cell holder (4). Preferably, the battery assembly further includes a housing (2) in which the battery pack (1) can be housed.

15. An electric bicycle, comprising the battery assembly (10) according to claim 14.

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