Fixing structure and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a fixing structure and a battery pack, the fixing structure comprises a shell, a placement frame and a bolting part, the placement frame comprises a placement part, the placement part comprises a placement body and a supporting part, and a placement groove for fixing a battery cell group is formed in the placement body. When the placement body is arranged in the shell, a gap is formed between the shell and the placement body, the supporting part is supported between the shell and the placement body, and the supporting part and the placement body are fixedly connected. And the bolting part penetrates through the shell and is bolted with the supporting part. According to the fixing structure and the battery pack provided by the invention, the cooling efficiency of the cooling liquid is improved, the stability of the gap between the shell and the placement body is ensured, the probability of collision between the placement body and the shell is reduced, mutual positioning of the placement frame and the shell is realized, and the connection precision of the battery pack is ensured.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a fixed structure and battery pack. Background Technology

[0002] Submersible cooled battery packs completely immerse the energy storage batteries in a special insulating coolant. Heat exchange occurs through direct contact between the coolant and the battery, rapidly absorbing the heat generated during charging and discharging and transferring it to an external circulation system for cooling. This technology ensures the batteries operate safely and efficiently.

[0003] Cylindrical batteries, also known as cylindrical lithium batteries, are widely used in electric vehicles, power banks, drones, solar lights, lawn lights, backup power, power tools, and toy models due to their advantages such as high capacity, long cycle life, and wide operating temperature range.

[0004] However, the circular outer surface of cylindrical batteries makes them difficult to directly fix onto flat or specifically shaped structures, requiring additional fixing devices or structures to accommodate their shape. These additional fixing devices not only affect the flow of insulating coolant within the submerged cooling battery pack, but also exhibit poor stability and are easily damaged under vibration and impact in dynamic environments. Utility Model Content

[0005] The purpose of this application is to provide a fixing structure and battery pack to address, to some extent, the technical problem in the prior art where the circular outer surface of cylindrical batteries makes them difficult to directly fix onto planar or specifically shaped structures, requiring additional fixing devices or structures to accommodate their shape. Furthermore, these additional fixing devices not only affect the flow of insulating coolant within the submerged cooling battery pack, but also exhibit poor stability and are prone to damage under vibration and impact in dynamic environments.

[0006] According to a first aspect of this application, a fixing structure is provided, including a housing, a mounting frame and a bolting part, wherein the mounting frame includes a mounting member, the mounting member includes a mounting body and a support part, and the mounting body is provided with a mounting slot for fixing a battery cell assembly;

[0007] With the mounting body disposed within the housing, a gap is formed between the housing and the mounting body, the support portion is supported between the housing and the mounting body, and the support portion and the mounting body are fixedly connected.

[0008] The bolted part penetrates the housing and is bolted to the support part.

[0009] Preferably, the housing is a cylinder extending along a first direction, the mounting body is a polygonal column extending along the first direction, and the support portion is disposed on the edge of the polygonal column.

[0010] Preferably, the housing has a through hole that penetrates the housing wall at a position corresponding to the support portion, and the bolted portion is bolted to the support portion via the through hole;

[0011] The fixing structure also includes a sealing part, and the bolted part is bolted to the support part through the sealing part and the through hole in sequence, so as to seal the through hole via the sealing part.

[0012] Preferably, the sealing portion includes a rigid limiting layer and a flexible sealing layer, wherein the flexible sealing layer is attached to the side of the rigid limiting layer facing the housing.

[0013] Preferably, the side of the sealing part facing the housing is a contoured surface that conforms to the shape of the outer surface of the housing;

[0014] The side of the sealing part facing away from the housing is a plane perpendicular to the bolted part.

[0015] Preferably, at least two of the multiple side ribs of the mounting body that are opposite to each other are provided with the support portion;

[0016] The support portion is symmetrically arranged about the corresponding edge.

[0017] Preferably, the support portion includes:

[0018] The first support member is a fan-shaped column extending along the first direction;

[0019] The second support member is a rectangular column extending along the first direction.

[0020] Preferably, the mounting frame includes two mounting members, and the mounting slots of the two mounting members can be joined together along the first direction to form a receiving space for accommodating the battery cell assembly;

[0021] With the two mounting components of the mounting frame in a mating state, the support portions of the two mounting components are aligned.

[0022] Preferably, the battery pack includes multiple mounting frames, and the battery pack includes multiple sets of battery cells. The multiple mounting frames are stacked along the first direction, and each mounting frame is provided with one set of battery cells.

[0023] According to a second aspect of this application, a battery pack is provided, including the fixing structure described in any of the above technical solutions, and thus possesses all the beneficial technical effects of the fixing structure, which will not be repeated here.

[0024] Compared with the prior art, the beneficial effects of this application are as follows:

[0025] The fixing structure provided in this application creates a gap between the housing and the mounting body, allowing the flow of insulating coolant within the battery pack and thus improving the cooling efficiency of the coolant. A support portion is used to support the housing and the mounting body, fixing the support portion to the mounting body. A bolted portion passes through the housing and bolts the support portion, securing the housing and mounting body together. This not only ensures the stability of the gap between the housing and the mounting body, effectively reducing the probability of collision between them, but also achieves mutual positioning between the mounting frame and the housing, ensuring the connection accuracy of the battery pack.

[0026] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is an isometric structural diagram of the fixed structure provided in the embodiments of this application;

[0029] Figure 2 This is an exploded structural diagram of the fixed structure provided in the embodiments of this application;

[0030] Figure 3 This is a side view of the fixed structure provided in an embodiment of this application;

[0031] Figure 4 A front view schematic diagram of the assembly structure of the bolted part and the sealing part provided in the embodiment of this application;

[0032] Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure obtained by cutting the assembly structure of the bolted part and the sealing part along the AA direction;

[0033] Figure 6This is an isometric structural diagram of another fixed structure provided in an embodiment of this application.

[0034] Figure label:

[0035] 1-Installation component; 10-Installation body; 11-First support component; 12-Second support component; 21-Bolt connection; 22-Sealing part; 221-Rigid limiting layer; 222-Flexible sealing layer; 31-First polarity busbar; 32-Second polarity busbar; 4-Flexible circuit board; 5-Housing; 6-Cell assembly.

[0036] F1 - First direction; F2 - Second direction; G - Gravity direction. Detailed Implementation

[0037] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0038] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0039] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] The following reference Figures 1 to 6 The present application describes a mounting structure and battery pack according to some embodiments.

[0043] See Figures 1 to 6 As shown, an embodiment of the first aspect of this application provides a fixing structure, which includes a housing 5, a mounting frame, and a fastening part 21. The mounting frame includes a mounting member 1, which includes a mounting body 10 and a support part. The mounting body 10 has a mounting slot for fixing the battery cell assembly 6. When the mounting body 10 is disposed within the housing 5, a gap is formed between the housing 5 and the mounting body 10. The support part is supported between the housing 5 and the mounting body 10, and the support part and the mounting body 10 are fixedly connected. The fastening part 21 passes through the housing 5 and is fastened to the support part.

[0044] The fixing structure provided by the above-mentioned technical features creates a gap between the housing 5 and the mounting body 10, which allows for the flow of insulating coolant within the battery pack, thereby improving the cooling efficiency of the coolant. A support portion is used to support the housing 5 and the mounting body 10, fixing the support portion to the mounting body 10. A bolted portion 21 passes through the housing 5 and bolts to the support portion, ensuring that the housing 5 and the mounting body 10 are fixed together via the bolted portion 21 and the support portion. This not only ensures the stability of the gap between the housing 5 and the mounting body 10, effectively reducing the probability of collision between the mounting body 10 and the housing 5, but also achieves mutual positioning between the mounting frame and the housing 5, ensuring the connection accuracy of the battery pack.

[0045] Preferably, such as Figure 2 , Figure 3 and Figure 6 As shown, the housing 5 can be a cylinder extending along the first direction F1, and the mounting body 10 can be a polygonal column extending along the first direction F1. The support portion can be provided on the edge of the polygonal column. In this way, on the one hand, by utilizing the shape difference between the cylindrical housing 5 and the polygonal column mounting body 10, the gap between the housing 5 and the mounting body 10 is further increased, which not only facilitates the flow of insulating coolant, but also provides more space for installing other devices of the battery pack (e.g., connecting harnesses). On the other hand, by providing the support portion on the edge of the polygonal column, the distance of the support portion in the radial direction of the housing 5 can be effectively shortened, further improving the support stability of the support portion and saving the material cost of the support portion.

[0046] Optionally, the bolted part 21 can be a threaded connection such as a bolt or screw.

[0047] Preferably, the housing 5 has a through hole penetrating the wall of the housing 5 at a position corresponding to the support portion, and the bolted component is bolted to the support portion through the through hole. For example... Figure 1 and Figure 3 As shown, the fixing structure may also include a sealing part 22, and a bolted part 21 is bolted to the support part through the sealing part 22 and the through hole in sequence, so as to seal the through hole through the sealing part 22, thereby effectively improving the sealing performance of the housing 5 in the through hole.

[0048] Preferably, such as Figure 5 As shown, the sealing part 22 may include a rigid limiting layer 221 and a flexible sealing layer 222. The flexible sealing layer 222 is attached to the side of the rigid limiting layer 221 facing the housing 5. Thus, on the one hand, the elastic deformation of the flexible sealing layer 222 effectively improves the fit between the sealing part 22 and the surface of the housing 5, thereby improving the sealing performance of the sealing part 22. On the other hand, the rigid limiting layer 221 enables the bolted part 21 to interact with the rigid limiting layer 221 of the sealing part 22, so as to ensure the locking force and positioning accuracy of the bolted part 21.

[0049] Preferably, such as Figure 5 As shown, the side of the sealing part 22 facing the housing 5 is a contoured surface that conforms to the shape of the outer surface of the housing 5, so as to improve the fit between the sealing part 22 and the housing 5, thereby ensuring the sealing performance of the sealing part 22.

[0050] Preferably, such as Figure 5 As shown, the side of the sealing part 22 facing away from the housing 5 is a plane perpendicular to the bolting part 21, so as to facilitate the contact between the bolting part 21 and the sealing part 22.

[0051] Preferably, such as Figure 3 As shown, at least two of the multiple side ribs of the mounting body 10 that are opposite to each other are provided with the aforementioned support portion to ensure the mounting stability of the mounting body 10.

[0052] Preferably, such as Figure 3 As shown, the aforementioned support portions can be symmetrically arranged about the corresponding edge to improve the uniformity of the support force on the mounting body 10. Correspondingly, in the radial direction of the housing 5, the center of the through hole corresponding to the support portion can overlap with the edge corresponding to the support portion.

[0053] Preferably, such as Figure 2 and Figure 3 As shown, the above-mentioned support part may include a first support member 11, which may be a fan-shaped column extending along the first direction F1, so as to increase the contact area between the support part and the housing 5, thereby improving the support stability of the support part, effectively reducing the stress concentration of the housing 5 at the location of the support part, and thus improving the stability of the housing 5.

[0054] Optionally, the top corner of the aforementioned sector column may be provided with a notch that conforms to the side profile of the mounting body 10, so as to facilitate the connection between the first support 11 and the mounting body 10. In other words, the aforementioned first support 11 is not a complete sector column in a geometric sense, but a partial structure of a sector column that lacks the top corner of the sector column.

[0055] Preferably, when viewed along the radial direction of the housing 5, the axis of the sector column overlaps with the corresponding edge of the support portion.

[0056] Preferably, such as Figure 2 and Figure 3 As shown, the above-mentioned support may include a second support member 12, which may be a rectangular column along the first direction F1 to reduce the space occupancy of the support.

[0057] like Figure 3 As shown in the figure, an example of the aforementioned mounting body 10 being a regular hexagonal prism is illustrated. The following will use... Figure 3 The installation frame shown is described in detail.

[0058] When the battery pack is in use, the first direction F1 is perpendicular to the gravity direction G, wherein two of the six side walls of the regular hexagonal prism are perpendicular to the gravity direction G (these two are defined as the top wall and the bottom wall, respectively). For ease of description, the direction perpendicular to both the first direction F1 and the gravity direction G is defined as the second direction F2.

[0059] Preferably, such as Figure 3 As shown, the two sides of the bottom wall in the second direction F2 can be respectively provided with the first support member 11 to ensure the support stability of the mounting body 10.

[0060] Preferably, such as Figure 3 As shown, the two side edges of the regular hexagonal prism on the second direction F2 can also be provided with the aforementioned first support member 11 to ensure the stability of the mounting body 10 on the second direction F2 and to prevent the mounting body 10 from shaking relative to the shell 5 on the second direction F2.

[0061] Preferably, such as Figure 3 As shown, one of the side ribs on both sides of the top wall in the second direction F2 can be provided with a wiring harness for electrical connection of the battery pack, and the other side of the side ribs on both sides of the top wall in the second direction F2 can be provided with the second support member 12. On the one hand, the second support member 12 can provide more space for wiring harness arrangement; on the other hand, by providing the second support member 12, the stability of the mounting body 10 can be further ensured, and the mounting body 10 can be prevented from shaking relative to the shell 5 in the direction of gravity G.

[0062] However, it is not limited to the above-mentioned mounting body 10. It is not limited to the form of a regular hexagonal prism. For example, the mounting body 10 can also be a triangular prism, a square prism, a pentagonal prism, an octagonal prism, etc.

[0063] In an embodiment, such as Figure 2 As shown, the aforementioned mounting frame may include two mounting components 1, the mounting slots of which can be connected along the first direction F1 to form a receiving space for accommodating the battery cell assembly 6, so as to ensure the integrity of the protection of the battery cell assembly 6 by the mounting frame.

[0064] Preferably, such as Figure 2 and Figure 6 As shown, when the two mounting parts 1 of the mounting frame are in a mating state, the support parts of the two mounting parts 1 are aligned to facilitate the processing of the through hole and the mating of the support parts with the housing 5.

[0065] Preferably, such as Figure 1 and Figure 6 As shown, the aforementioned fixing structure may include multiple mounting frames. Correspondingly, the battery pack may include multiple battery packs, and the multiple mounting frames may be stacked along the first direction F1. Each mounting frame may be equipped with a set of battery cells 6 to achieve the integration of multiple sets of battery cells 6 in the battery pack.

[0066] Preferably, such as Figure 2 and Figure 6 As shown, when multiple mounting frames are stacked along the first direction F1, the support parts of the multiple mounting frames are aligned one by one to further facilitate the processing of the through holes and the docking of the support parts with the housing 5.

[0067] Preferably, such as Figure 2 As shown, the aforementioned mounting groove can be adapted to the shape of the aforementioned mounting body 10, and the aforementioned battery cell group 6 can include multiple battery cells, which can be arranged in a matrix within the mounting groove.

[0068] Optionally, such as Figure 2 As shown, the above-mentioned cell can make a cylindrical battery, and the two ends of the cylindrical cell in the first direction F1 can be respectively provided with a first polarity and a second polarity.

[0069] Preferably, such as Figure 2 As shown, the aforementioned mounting member 1 is provided with a connecting hole penetrating the mounting body 10 along the first direction F1. Preferably, the number of the connecting holes can be adapted to the number of battery cells included in the battery cell assembly 6. When the two mounting members 1 are covered outside the battery cell assembly 6 from both ends of the first direction F1, the first polarity and second polarity of each battery cell can be exposed by the corresponding connecting holes of the two mounting members 1, so as to facilitate the electrical connection of the battery cells.

[0070] The second aspect of this application also provides a battery pack including the fixing structure of any of the above embodiments, and thus has all the beneficial technical effects of the fixing structure, which will not be repeated here.

[0071] Preferably, such as Figure 2 As shown, the battery pack may also include a first polarity busbar 31 and a second polarity busbar 32. Each mounting frame has a first polarity busbar 31 and a second polarity busbar 32 at both ends to facilitate the electrical connection of the first polarity and the second polarity of each cell in the cell group 6.

[0072] Preferably, such as Figure 1 As shown, the battery pack may also include a flexible printed circuit board 4 (FPC) for collecting the temperature and voltage of the corresponding battery pack.

[0073] Optionally, such as Figure 1 As shown, the flexible circuit board 4 can be disposed at one end of the mounting frame opposite to the first polarity bus 31 and connected to the first polarity bus 31.

[0074] Optionally, not shown in the figure, the flexible circuit board 4 can be disposed at one end of the second polarity busbar 32 opposite to the mounting frame and connected to the second polarity busbar 32.

[0075] Preferably, such as Figure 1 and Figure 6 As shown, the aforementioned multiple mounting frames can all be installed inside the aforementioned housing 5.

[0076] Optionally, not shown in the figure, the battery pack may further include a buffer insulation section. This buffer insulation section can be disposed within the gap formed by the shape difference between the polygonal column and the cylindrical shell 5. On the one hand, this effectively improves the battery pack's resistance to compression and impact; on the other hand, it effectively improves the battery pack's heat insulation capacity. Optionally, the buffer insulation section can be a buffer insulation material, such as foam or cotton foam.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A fixed structure, characterized in that, It includes a housing, a mounting frame, and a bolting part. The mounting frame includes a mounting component, which includes a mounting body and a support part. The mounting body is provided with a mounting slot for fixing the battery cell assembly. With the mounting body disposed within the housing, a gap is formed between the housing and the mounting body, the support portion is supported between the housing and the mounting body, and the support portion and the mounting body are fixedly connected. The bolted part penetrates the housing and is bolted to the support part.

2. The fixing structure according to claim 1, characterized in that, The shell is a cylinder extending along a first direction, the mounting body is a polygonal column extending along the first direction, and the support portion is disposed on the edge of the polygonal column.

3. The fixing structure according to claim 1, characterized in that, The housing has a through hole that penetrates the housing wall at a position corresponding to the support portion, and the bolted portion is bolted to the support portion via the through hole; The fixing structure also includes a sealing part, and the bolted part is bolted to the support part through the sealing part and the through hole in sequence, so as to seal the through hole via the sealing part.

4. The fixing structure according to claim 3, characterized in that, The sealing part includes a rigid limiting layer and a flexible sealing layer, wherein the flexible sealing layer is attached to the side of the rigid limiting layer facing the housing.

5. The fixing structure according to claim 3, characterized in that, The side of the sealing part facing the housing is a contoured surface that conforms to the shape of the outer surface of the housing; The side of the sealing part facing away from the housing is a plane perpendicular to the bolted part.

6. The fixing structure according to claim 2, characterized in that, At least two of the multiple side ribs of the mounting body that are opposite to each other are provided with the support portion; The support portion is symmetrically arranged about the corresponding edge.

7. The fixing structure according to claim 6, characterized in that, The support portion includes: The first support member is a fan-shaped column extending along the first direction; The second support member is a rectangular column extending along the first direction.

8. The fixture of claim 2, wherein The mounting frame includes two mounting members, and the mounting slots of the two mounting members can be connected along the first direction to form a receiving space for accommodating the battery cell assembly; With the two mounting components of the mounting frame in a mating state, the support portions of the two mounting components are aligned.

9. The fixture of claim 2, wherein The battery pack includes multiple mounting frames and multiple sets of battery cells. The mounting frames are stacked along the first direction, and each mounting frame is provided with one set of battery cells.

10. A battery pack, characterized in that, The fixed structure includes any one of claims 1 to 9.

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