Battery cell arrangement with improved housing
By adopting a multi-piece housing design and connection method of shape fitting components in the battery cell arrangement structure, the problem of loosening or damage of the housing during impact or collision is solved, and a more robust battery cell arrangement structure is achieved.
Patent Information
- Application Number
- CN202411670845.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-22
- Filing Date
- 2024-11-21
- Publication Date
- 2025-05-23
AI Technical Summary
When the existing battery cell arrangement structure is impacted or collided, the housing or its components are easily loosened or damaged, resulting in unstable structure.
By adopting a multi-piece housing design in the battery cell arrangement, including the first and second housing components, and connecting with shape fitting elements such as protruding shape fitting elements and shape fitting elements of deepening or openings, the housing parts can be securely fixed under load.
The robustness of the battery cell arrangement structure is improved, especially when falling from a high place, it avoids damage or loosening of the shell or its components, and extends the service life of the battery cell arrangement structure.
Smart Images
Figure CN120033390A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a battery cell arrangement having a housing which is improved, in particular with respect to impacts or crashes. Background Art
[0002] Battery cell housings are known from the prior art in various designs. The housing of a battery cell arrangement is usually constructed in multiple parts with a cover and, if necessary, with a plurality of side parts or a base plate. A guide arrangement, such as a rail or the like, is often provided on the housing so that the battery cell arrangement can be pushed into an electrical load, such as an electric tool or the like. The individual parts of the housing of the battery cell arrangement are usually connected to one another by means of screws. In the event of an overload, for example when the battery cell arrangement falls from a greater height, in some cases, depending on the drop height and the impact position on the surface, the housing or housing parts may become loosened from the remaining battery cell arrangement. It would therefore be desirable to have a battery cell arrangement with improved impact resistance and robustness. Summary of the invention
[0003] The battery cell arrangement according to the invention having the features of claim 1 has the advantage that the housing can be mounted more securely on the battery cell arrangement. This can increase the robustness of the battery cell arrangement and, in particular, prevent damage or loosening of housing parts of the housing of the battery cell arrangement when falling onto a surface from a greater height. According to the invention, this is achieved in that the battery cell arrangement comprises at least one battery cell, in particular a round battery cell, a cell holding element, in particular a heat sink element, and a multi-part housing. The battery cell is at least partially, preferably around its entire periphery, surrounded by the cell holding element. The multi-part housing is designed to receive the battery cell and the cell holding element. In this case, the multi-part housing comprises at least a first housing part, in particular a first lateral part, and a second housing part, in particular an interface housing part or a cover. The second housing part preferably comprises a guide area, in particular a guide rail and a guide groove, which is designed to be connected to an electrical device. The electrical device is, for example, an electric motor in the case of an electric bicycle and an electric drive or an electric drive in the case of a handheld tool. The guide area is preferably arranged at the cover, but can also be arranged at other housing parts, such as the first housing part. The first housing part includes a first form-fitting element, the second housing part includes a second form-fitting element, and the single cell holding part includes a third form-fitting element. The form-fitting elements are configured to be connected to each other in a form-fitting manner. That is, at least one form-fitting element in the form-fitting element can be connected to two other form-fitting elements in a form-fitting manner. At least one form-fitting element in the form-fitting element, in particular the second form-fitting element at the second housing part, is configured as a protruding form-fitting element, wherein the protruding form-fitting element is embedded in two other form-fitting elements. The two other form-fitting elements are preferably deepenings or openings. The two other form-fitting elements are preferably arranged as openings that are configured complementary to each other. Therefore, the protruding form-fitting element extends through two openings at the second housing part and the single cell holding element. Thus, additional fixation of the first housing part, in particular at the single cell holding element, can be achieved.
[0004] The concept according to the invention makes it possible in particular that the battery cell arrangement does not have to have additional reinforcements, in particular at the guide area and / or guide recess arranged at the cover of the battery cell arrangement. As a result, interfaces for electrical appliances at the battery cell arrangement, which have existed for many years in part, can remain unchanged and the battery cell arrangement nevertheless has a more robust structure.
[0005] The dependent claims reveal preferred developments of the invention.
[0006] Preferably, at least one of the form-fit elements has a reinforcement element, in particular an insert made of metal or sheet metal. This makes it possible to achieve additional security and reinforcement of the form-fit element.
[0007] Furthermore, the cell holding element preferably has a protruding flange with a first opening as a third form-fitting element, and the second housing part has a second opening as a second form-fitting element. The first housing part has a protruding element as a first form-fitting element which is configured complementary to the first opening and the second opening and which is received in the first and second openings. This allows a particularly simple and compact structure to be achieved.
[0008] Preferably, the first opening of the cell holding element is a through-opening, in particular a polygonal through-opening, in particular a quadrilateral through-opening. Furthermore, preferably, the second opening at the second housing part is also a through-opening, in particular a polygonal through-opening, preferably a quadrilateral through-opening.
[0009] Particularly preferably, the first and second openings are designed with identical cross sections. This ensures that the protruding element received in both openings distributes the forces equally to the cell holding element and the cover under load. This avoids load peaks, for example when the battery cell arrangement is dropped.
[0010] The protruding element of the first housing part preferably comprises a rib, which in particular has a polygonal, in particular quadrilateral cross section. It should be noted that the protruding element can also comprise a plurality of ribs, which have the same and / or different cross sections. Correspondingly, a plurality of first and second openings are then formed in the second housing part or in the cell holding element.
[0011] Furthermore, the second housing part preferably has a protruding edge, on which the second opening is formed. Preferably, an undercut is additionally formed at the protruding edge, which is arranged between the cell holding element and the rib of the first housing part. The undercut significantly increases the load-bearing capacity of the connection of the housing parts.
[0012] For an even more reliable and more robust connection, a snap-in connection is preferably formed between the free end of the first protruding form-fit element of the first housing part and the second housing part and / or the cell holding element. The snap-in connection is, for example, a snap-in projection with a sliding-assisting bevel, which snaps into the final position after the first housing part is fully assembled. In order to release the connection between the first housing part and the second housing part and the cell holding element, the snap-in connection must therefore first be released so that these parts can be separated from one another.
[0013] Furthermore, preferably, a thread arrangement is also provided between the first housing part and the second housing part. The thread arrangement comprises a plurality of threaded connections, which can preferably be screwed into screw-in openings in the cell holding element. It is also possible here to additionally guide the screw of the threaded connection through an opening in the second housing part. This enables an additional connection in the component, which further enhances the robustness of the battery cell arrangement.
[0014] Furthermore, the connection between the cell holding element, the second housing part and the first housing part is preferably provided without adhesive. This results in cost advantages on the one hand, since no additional auxiliary materials, such as adhesives or the like, are required by the connection arrangement according to the invention. The concept according to the invention can also achieve an improvement in the quality of the battery cell arrangement, thereby increasing the satisfaction of the user of the battery cell arrangement, in particular also by increasing the service life.
[0015] Preferably, the housing of the battery cell arrangement also has a third housing part in addition to the first and second housing parts, wherein the connection between the third housing part, the cell holding element and the second housing part is implemented in the same way as in the first housing part. The first and third housing parts are preferably lateral parts of the battery cell arrangement. It should also be noted that the housing can also have a bottom part, wherein the connection between the bottom part, the cell holding element and the first and / or second housing part is implemented in the same way as in the case described above.
[0016] Preferably, the component or components, in particular the side parts, the heat sink and / or the guide rails, are each made of different plastic materials. As a result, the different components have different mechanical characteristic values. This allows for an individual adaptation of the battery cell arrangement to different external boundary conditions. For example, the guide rails can be made of a plastic that is more stable than the side parts.
[0017] Furthermore, preferably, the distance between the second form-fit element and the guide region of the battery cell arrangement on the second housing part is at most five times, in particular three times, the height of the second form-fit element. Preferably, the distance between the second form-fit element and the guide region is at most 30 mm, in particular at most 20 mm, and further in particular at most 10 mm. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the accompanying drawings:
[0019] Figure 1 shows a schematic exploded view of a battery cell arrangement according to a first exemplary embodiment of the present invention,
[0020] Figure 2 Shows Figure 1 A perspective view of a battery cell with a heat sink element,
[0021] Figure 3 Shows Figure 1 Schematic perspective interior view of a lateral part of a battery cell arrangement of
[0022] Figure 4 Shows Figure 1 A schematic perspective view of a cover of a battery cell arrangement,
[0023] Figure 5 Shows Figure 1 A schematic cross-sectional view of a battery cell arrangement structure,
[0024] Figure 6 Shows Figure 1 An enlarged partial sectional view of a battery cell arrangement in the connection region between a heat sink and a housing component, and
[0025] Figure 7 Shows the corresponding Figure 6 A partial cross-sectional view of the case of tensile loading, and
[0026] Figure 8 A schematic partial sectional view of a connection region of a battery cell arrangement according to a second exemplary embodiment of the invention is shown. DETAILED DESCRIPTION
[0027] Reference below Figures 1 to 7 A battery cell arrangement 1 according to a first preferred exemplary embodiment of the invention is described in detail.
[0028] As from Figure 1 As is evident, the battery cell arrangement 1 comprises a plurality of battery cells 2 which are surrounded by a cell holding element in the form of a heat sink element 3. In the present exemplary embodiment, the battery cells 2 are round cells. The heat sink element 3 surrounds the round cells at the circumference and between the individual round cells, which is described in detail by Figure 2 It's obvious.
[0029] The battery cell arrangement 1 further comprises a multi-part housing 4. The housing of this exemplary embodiment comprises a first side part 6 (first housing part), a second side part 7 (third housing part) and a cover 5 (second housing part). The housing 4 of the battery cell arrangement therefore does not surround all parts of the heat sink element 3, so that the heat sink element 3 is at least partially exposed and visible. This allows for improved heat management.
[0030] In addition, as in Figure 1As shown in FIG, a battery management system 20 for controlling and / or regulating the battery cells is arranged on the heat sink element 3. The battery management system 20 is completely covered and protected by a cover 5.
[0031] A guide area 50 in the form of a rail and an adjacent groove is also arranged on the cover 5. As a result, the battery cell arrangement can be pushed into a correspondingly designed mating rail on an electrical load, such as an electric tool. A spring-preloaded latching element 51 is also provided on the cover 5, which allows the battery cell arrangement to be latched on the electrical load.
[0032] As from Figure 2 As is apparent in detail, the heat sink element 3 has a protruding flange 30. The protruding flange 30 is arranged perpendicular to the surface of the heat sink element 3. Figure 2 As is evident, a projecting flange 30 is provided here respectively on a first side of the battery cell arrangement, to which the first side part 6 is fastened, and on a second side of the battery cell arrangement, to which the second side part 7 is fastened.
[0033] The protruding flange 30 has a plurality of first openings 31 (third form-fitting element). In the present embodiment, a total of four first openings 31 are provided in the protruding flange 30. The openings each have a rectangular cross section, wherein the rectangular cross sections of the first openings 31 are designed differently. However, the two protruding flanges 30 are constructed identically overall.
[0034] If in addition from Figure 4 As is evident, the cover 5 has a protruding edge 52 in which a plurality of second openings 51 (second form-fitting elements) are formed. The cross section of the second openings 51 is identical to the cross section of the first openings 31 in the heat sink element 3. Here, the protruding edge 52 of the cover 5 also protrudes perpendicularly from the base surface of the cover.
[0035] As in Figure 3 As shown in FIG. 1 , the first side part 6 has a protruding element 60 (first form-fitting element) on the inner side 62 of the cover. The protruding element 60 includes a plurality of ribs 61. These ribs 61 protrude vertically from the inner side 62 of the cover in the direction of the interior of the battery cell arrangement 1. As will be seen in detail from FIG. Figure 3 As is evident, the cross section of the rib 61 is designed to be complementary to the cross section of the first and second openings.
[0036] exist Figure 5 , Figure 6 and 7In the assembled state of the battery cell arrangement 1 shown in FIG. 1 , the protruding element 60 at the first side part 6 can therefore first be guided through the second opening 51 of the cover 5 and then through the first opening 31 at the heat sink element 3 (see FIG. 1 ). Figure 6 ).
[0037] On the protruding edge 51 of the cover 5, an undercut 53 is also formed, which protrudes toward the first side part 6 (see Figure 4 and Figure 6 ).
[0038] If a tensile load now acts on the battery cell arrangement 1, for example due to a fall, then the connection according to the invention between the cover 5, the first side part 6 and the heat sink element 3 can be used to release the heat from the battery cell arrangement 1. Figure 6 Starting from the static position shown in Figure 7 As indicated by arrow A in FIG. 6 , a tensile load is applied to the connection. Thus, the rib 61 can be Figure 7 5 . However, as described above, the rib 61 is fixed in a substantially form-fitting manner both in the first opening and in the second opening. This results in a significant resistance to tensile loads A, which are then distributed not only to the cover 5 but also to the heat sink element 3. This prevents the rib 61 from breaking off and the housing 4 of the battery cell arrangement 1 from splitting apart. As an additional solution, due to the provided undercut 35 at the protruding edge 52, a further force distribution is achieved in the connection between the first side part 6 and the cover 5 and the heat sink element 3. The undercut 53 also makes it possible to easily introduce the rib 61 not only into the second opening 51 but also into the first opening 31.
[0039] In addition to the previously described connections between the heat sink element 3, housing parts and cover 5, a screw connection 10 is provided for the battery cell arrangement 1. The screw connection 10 connects the heat sink element 3 to the first side part 6 and the cover 5 or to the second side part 7 and the cover 5.
[0040] The threaded connection part 10 is detailed from Figure 1 and Figure 5As is apparent, the first lateral part 6 comprises a plurality of screws 11. A first screw opening 12 is provided in the first lateral part 6. A second screw opening 13 is provided in the cover 5 and a third screw opening 14 is provided in the heat sink element 3. The screws 11 are guided through the first, second and third screw openings 12, 13, 14. Thus, additional security of the connection between the components is achieved. It should be noted that the second lateral part 7 is fixed in the same way by means of a plurality of screw connections 10.
[0041] The second side part 7 of the housing 4 is fastened to the battery cell arrangement 1 in the same manner as the first housing part 6 , so that a detailed description of this fastening can be dispensed with.
[0042] The connection according to the invention between the heat sink element 3, the cover 5 and the housing parts 6, 7 thus makes it possible to achieve a significant increase in the robustness of the battery cell arrangement. In particular, a reliable connection can be achieved by nesting the fixing elements. The connection is adhesive-free, so that in particular costs can be reduced by eliminating adhesive and reducing the number of assembly steps. In addition, a plurality of screw connections are provided as an additional, redundant fixing of the components. Overall, this results in a significant improvement in the quality of the battery cell arrangement 1, which can withstand a fall from a greater height without being damaged.
[0043] The battery cell arrangement 1 is preferably assembled in such a way that the battery cells are first provided with a heat sink element 3 which surrounds the battery cells at their circumference. The cover 5 is then placed onto the heat sink element 3 and the two side parts 6, 7 are guided through the first and second openings with the ribs 61. Screwing is then performed.
[0044] Figure 8 The figure shows a battery cell arrangement with a component connection according to a second exemplary embodiment of the invention. The second exemplary embodiment corresponds essentially to the first exemplary embodiment, wherein, as shown in the figure, in addition to the first exemplary embodiment, a latching connection 8 is arranged on the rib 61 at the free end of the rib. The latching connection 8 comprises a latching projection 80 with an undercut 81. As shown in Figure 8 As shown in FIG. 1 , the undercut 81 engages behind the protruding flange 30 on the heat sink element 3 in the assembled state. This makes it possible to additionally fix the component connection of the battery cell arrangement. Preferably, a latching connection 8 is provided on each rib 61. As in the previous exemplary embodiment, the same embodiment is implemented in Figure 8 The design of the second side component 7 which is not shown in FIG.
Claims
1. A battery cell arrangement structure, comprising: - at least one battery cell (2), - a cell holding element (3) which at least partially surrounds the battery cell (2), a multi-part housing (4) which is designed to receive the battery cell (2), wherein the housing (4) comprises at least a first housing part (6), in particular a lateral part, and a second housing part, in particular a connection housing part or a cover, wherein the first housing part (6) has a first form-fitting element (60), the second housing part (5) has a second form-fitting element (51), and the cell holding element (3) has a third form-fitting element (31), which are designed to be connected to one another in a form-fitting manner, wherein at least one of the form-fit elements, in particular the second form-fit element, is designed as a protruding form-fit element, wherein the protruding form-fit element engages in two other form-fit elements.
2. The battery cell arrangement structure according to claim 1, wherein: At least one of the form-fit elements has a reinforcement element, in particular a reinforcement coating.
3. The battery cell arrangement according to claim 1, wherein the cell holding element (3) has a protruding flange (30) with a first opening as a third form-fitting element, and the second housing part (5) has a second opening, and -in, The first housing part (6) has a protruding element (60) which is designed complementary to the first opening and the second opening as a first form-fit element and is received in the first opening and the second opening.
4. The battery cell arrangement structure according to claim 3, wherein: The first opening (31) at the protruding flange (30) of the cell holding element is a through-opening, in particular a polygonal one, and / or the second opening (51) at the second housing part (5) is a through-opening, in particular a polygonal one.
5. The battery cell arrangement structure according to claim 2, wherein: The cross section of the first opening (31) is the same as the cross section of the second opening (51).
6. The battery cell arrangement according to claim 1, wherein: At least one guide rail is arranged on the second housing part (5), which guide rail is provided for connection to an electrical device.
7. The battery cell arrangement according to claim 1, wherein: The protruding form-fitting element comprises a rib (61).
8. The battery cell arrangement according to claim 1, wherein: The second housing part (5) has a protruding edge (52) in which the second opening (51) is formed.
9. The battery cell arrangement structure according to claim 8, wherein: The protruding edge (52) has an undercut (53) which is arranged between the cell holding element (3) and a first protruding form-fit element (61) of the first housing part (6).
10. The battery cell arrangement according to claim 1, further comprising a latching connection (8) which is formed at the free end of the first protruding form-fit element (61) and the cover (5) and / or the cell holding element (3).
11. The battery cell arrangement according to claim 1, wherein: A threaded connection portion (10) is provided between the first housing component (6) and the second housing component (5). 12 . The battery cell arrangement as claimed in claim 1 , further comprising a third housing part, in particular a second side part ( 7 ), which is designed corresponding to the first housing part ( 6 ).
13. The battery cell arrangement according to claim 1, wherein: The first housing part (6), the cell holding element (3) and / or the second housing part or parts thereof, in particular guide rails, are produced from different materials, in particular different plastic materials.
14. The battery cell arrangement according to claim 1, wherein: The distance between the second form-fit element (51) and the guide region (50) on the second housing part (5) is at most five times the height of the second form-fit element, in particular at most 30 mm.