Fixing assembly and battery pack

Abstract

The utility model provides a fixing assembly and a battery pack, and relates to the technical field of batteries. The fixing assembly is used for fixing a shell of a battery pack, the fixing assembly comprises a bracket and a bundling piece, the bracket is detachably connected with the bundling piece, and at least one of the bundling piece and the bracket is a telescopic piece; when the fixing assembly is installed on the shell, the bracket is connected with the bundling piece, the bundling piece and the bracket are attached to the outer side wall of the shell, and the telescopic piece is in an extension state, so that the fixing assembly can apply force to the shell. Therefore, force is applied to the shell through the fixing assembly, the pressure endurance capability of the shell can be improved, the wall thickness of the shell can be thinner, the mass of the shell is smaller, and the light weight of the battery pack is favorably realized.

Description

Technical Field

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

[0002] With the development of automotive technology, new energy vehicles are being used more and more widely due to their environmentally friendly and energy-saving characteristics. As one of the core components of new energy vehicles, the performance of the battery pack directly determines the vehicle's range, power output, safety, and overall user experience.

[0003] A battery pack typically consists of a housing and multiple battery modules, all housed within the housing. During operation, the battery modules generate a significant amount of heat. To ensure the safety of the battery pack during operation, a liquid cooling plate is usually installed inside the housing to cool the battery modules.

[0004] However, the cooling effect of liquid cooling plates is limited. Therefore, immersion liquid-cooled battery packs began to emerge. Immersion liquid cooling involves directly introducing oil into the pack to cool the battery modules. However, the pressure of the oil inside the pack is high, and the pack's pressure resistance is poor. This necessitates increasing the pack's wall thickness to meet the requirements of immersion liquid cooling, which increases the battery pack's weight and hinders its lightweight design. Utility Model Content

[0005] In view of this, this application provides a fixing component and a battery pack to solve the problem that the poor pressure resistance of the enclosure requires increasing the wall thickness of the enclosure to meet the requirements of immersion liquid cooling, which increases the weight of the battery pack and is not conducive to the lightweighting of the battery pack.

[0006] This application provides a fixing component for fixing the housing of a battery pack. The fixing component includes a bracket and a strapping member. The bracket and the strapping member are detachably connected. At least one of the strapping member and the bracket is a telescopic member.

[0007] When the fixing component is installed on the housing, the bracket is connected to the strapping member, the strapping member and the bracket are respectively attached to the outer side wall of the housing, and the telescopic member is in an extended state.

[0008] Preferably, the telescopic member includes a telescopic part and an extension part connected to each other. The extension part can fit against the outer side wall of the housing. The middle part of the telescopic part protrudes in a direction away from the housing from the two ends of the telescopic part. The telescopic part can undergo elastic deformation.

[0009] Preferably, the number of the extensions is greater than or equal to two, and two adjacent extensions are connected by the telescopic part.

[0010] Preferably, the fixing component further includes two first fixing members and two second fixing members, the two first fixing members being connected to both ends of the bracket, and the two second fixing members being connected to both ends of the binding member;

[0011] The two first fasteners correspond to the two second fasteners respectively, and the first fasteners and the second fasteners corresponding to the first fasteners are detachably connected.

[0012] Preferably, the battery pack further includes a bottom protective plate, and the fixing assembly further includes a mounting member, which is connected to the side of the bracket opposite to the strapping member, and the mounting member is used to connect to the bottom protective plate.

[0013] According to another aspect of this application, a battery pack is provided, the battery pack including a housing, a plurality of battery modules and the aforementioned fixing component, the housing enclosing an installation cavity, the plurality of battery modules being disposed within the installation cavity, the housing having an inlet and an outlet, the inlet and the outlet being in communication with the installation cavity, and the fixing component being clamped onto the housing.

[0014] Preferably, the housing is cylindrical, and the telescopic member is capable of extending and retracting circumferentially along the housing.

[0015] Preferably, the battery pack further includes a connecting frame and a bottom protective plate, the fixing assembly is fixed on the connecting frame, and the connecting frame is detachably connected to the bottom protective plate.

[0016] Preferably, a plane parallel to the bottom protective plate is defined as a projection plane, and the orthographic projection of the housing on the projection plane is located inside the orthographic projection of the bottom protective plate on the projection plane.

[0017] Preferably, the battery pack includes a plurality of fixing components, which are arranged at intervals along the axial direction of the housing.

[0018] The fixing assembly of this application is used to fix the housing of a battery pack. The fixing assembly includes a bracket and a strapping member, which are detachably connected. At least one of the strapping member and the bracket is a telescopic member. When the fixing assembly is installed on the housing, the bracket and the strapping member are connected, and the strapping member and the bracket are respectively abutted against the outer side wall of the housing, and the telescopic member is in an extended state, which allows the fixing assembly to apply force to the housing. In this way, by applying force to the housing through the fixing assembly, the pressure resistance of the housing can be improved, the wall thickness of the housing can be reduced, and the weight of the housing can be reduced, which is beneficial to the lightweighting of the battery pack. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A three-dimensional structural diagram of the battery pack is shown;

[0021] Figure 2 A plan view of the battery pack from one perspective is shown;

[0022] Figure 3 A plan view of the battery pack from another perspective is shown;

[0023] Figure 4 An exploded view of the battery pack is shown;

[0024] Figure 5 A three-dimensional structural diagram of the strapping component is shown;

[0025] Figure 6 A schematic diagram of the planar structure of the strapping component is shown;

[0026] Figure 7 Show Figure 6 Enlarged view of part A in the middle.

[0027] Icons: 1-Shell; 11-Cylinder; 12-Cylinder cover; 2-Fixing component; 21-Bracket; 22-Binding component; 221-Telescopic part; 222-Extension part; 23-First fixing component; 24-Second fixing component; 25-Mounting component; 3-Bottom guard plate; 4-Connecting frame; 41-Frame; 42-Fixing strip; 51-MSD; 52-BDU; 53-High pressure plug; 54-Low pressure plug; 61-Inlet pipe; 62-Outlet pipe. Detailed Implementation

[0028] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0029] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0030] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0031] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0032] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0033] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0034] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0035] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0036] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0037] According to one aspect of this application, a fixing component 2 is provided for fixing a battery pack housing 1. The fixing component 2 includes a bracket 21 and a strapping member 22, which are detachably connected. At least one of the bracket 21 and the strapping member 22 is a telescopic member. When the fixing component is installed on the housing, the bracket 21 and the strapping member 22 are connected, and the bracket 21 and the strapping member 22 are respectively abutted against the outer side wall of the housing, and the telescopic member is in an extended state, which allows the fixing component 2 to apply force to the housing.

[0038] Furthermore, the bracket 21 is detachably connected to the strapping member 22, which facilitates fixing the housing 1 to the fixing component 2 or removing the housing 1 from the fixing component 2. Simultaneously, when oil is injected into the receiving cavity, causing deformation of the housing 1, or when the housing 1 undergoes slight deformation due to temperature changes, the telescopic member can extend or retract to ensure that the fixing component 2 can tightly secure the housing 1, thus ensuring the reliability of the fixing component 2 in fixing the housing 1.

[0039] Furthermore, the telescopic component includes a telescopic portion and an extension portion connected together. The extension portion fits against the outer wall of the housing, and the middle portion of the telescopic portion protrudes away from the housing from its two ends, allowing the telescopic portion to undergo elastic deformation. Thus, the distance between the two ends of the telescopic portion can be increased or decreased, enabling the entire strapping component to extend and retract.

[0040] In addition, the number of extensions is greater than or equal to two, and two adjacent extensions are connected by telescopic joints.

[0041] Optionally, in one embodiment of this application, only the bracket 21 is a telescopic member, in which case the bracket 21 includes a telescopic portion and an extension portion connected together; in another embodiment of this application, only the strapping member 22 is a telescopic member, in which case the strapping member 22 includes a telescopic portion and an extension portion connected together; in yet another embodiment of this application, both the strapping member 22 and the bracket 21 are telescopic members, in which case the strapping member 22 includes a telescopic portion and an extension portion connected together, and the bracket 21 includes a telescopic portion and an extension portion connected together.

[0042] Preferably, only the strapping component 22 is a retractable component, such as... Figure 5 , Figure 6 and Figure 7 As shown, the bracket 21 is arc-shaped, and the strapping member 22 includes a telescopic part 221 and an extension part 222 connected to each other. The extension part 222 fits against the outer wall of the housing 1. The middle part of the telescopic part 221 protrudes away from the housing 1 from its two ends, and the telescopic part 221 can undergo elastic deformation. In this way, the distance between the two ends of the telescopic part 221 can be increased or decreased, thereby allowing the entire strapping member 22 to extend and retract. The number of extension parts 222 in the fixing assembly 2 is greater than or equal to two, and two adjacent extension parts 222 are connected by a telescopic part 221. When there are ten extensions 222 and nine telescopic parts 221, the nine telescopic parts 221 can be divided into three groups, each group including three telescopic parts 221. The length of the extension 222 between the first telescopic part 221 and the second telescopic part 221 in a group is less than the length of the extension 222 between two adjacent telescopic parts 221 in the two groups. The length of the extension 222 between the second telescopic part 221 and the third telescopic part 221 in a group is less than the length of the extension 222 between two adjacent telescopic parts 221 in the two groups.

[0043] like Figure 4 As shown, the fixing assembly 2 also includes two first fixing members 23 and two second fixing members 24. Both the first fixing members 23 and the second fixing members 24 are plate-shaped. The two first fixing members 23 are respectively connected to both ends of the bracket 21, extending away from the housing 1 relative to the bracket 21. Two extensions 222 located at both ends of the strapping member 22 are respectively connected to the two second fixing members 24, extending away from the housing 1 relative to the strapping member 22. The two first fixing members 23 correspond to the two second fixing members 24, and the first fixing members 23 and their corresponding second fixing members 24 are fitted together. Furthermore, the first fixing members 23 and their corresponding second fixing members 24 can be detachably connected by bolts. Thus, by installing and removing bolts, the fixing assembly 2 can be connected and separated from the housing 1, facilitating the removal of the battery pack for repair in case of a battery pack malfunction.

[0044] In addition, the fixing component 2 also includes a mounting member 25, which is connected to the side of the bracket 21 opposite to the binding member 22 and is connected to the bottom protective plate 3, thereby fixing the housing 1 to the bottom protective plate 3.

[0045] Optionally, the bracket 21, the first fixing member 23 and the mounting member 25 can be integrally formed, and the binding member 22 and the second fixing member 24 can be integrally formed.

[0046] According to another aspect of this application, a battery pack is provided, comprising the aforementioned fixing component 2, housing 1, and multiple battery modules. The housing 1 encloses a mounting cavity, within which the multiple battery modules are disposed. The housing 1 has an inlet and an outlet, both of which communicate with the mounting cavity. This allows oil to enter the cavity through the inlet and exit through the outlet, thereby cooling the battery modules within the cavity. The fixing component 2 is clamped onto the housing 1, causing the strapping member 22 and the bracket 21 to respectively adhere to the outer wall of the housing 1. The fixing component 2 can apply force to the housing 1. Thus, by applying force to the housing 1 through the fixing component 2, the pressure resistance of the housing 1 can be improved, the wall thickness of the housing 1 can be reduced, and the weight of the housing 1 can be decreased, which is beneficial for achieving a lightweight battery pack.

[0047] Preferably, when only the strapping member 22 is a telescopic member and the bracket 21 and the strapping member 22 are installed on the housing 1, the strapping member 22 is in an extended state, which allows the strapping member 22 to apply force to the housing 1, thereby improving the pressure resistance of the housing 1.

[0048] In addition, by adjusting the temperature of the oil, the battery module can be cooled or heated, thereby meeting the temperature requirements of the battery pack in different environments.

[0049] Optionally, an inlet pipe 61 is provided on the inlet and an outlet pipe 62 is provided on the outlet. Both the inlet pipe 61 and the outlet pipe 62 are connected to the structure storing oil to facilitate the circulation of the oil.

[0050] In the embodiments of this application, such as Figure 1 and Figure 4 As shown, the battery pack also includes a bottom cover plate 3. The mounting part 25 of the fixing component 2 is connected to the side of the bracket 21 facing away from the housing 1. The mounting part 25 is connected to the bottom cover plate 3, thereby fixing the housing 1 to the bottom cover plate 3.

[0051] Furthermore, the battery pack also includes a connecting frame 4, which may include a rectangular frame 41 and a fixing strip 42 extending from the frame 41. The fixing strip 42 can be detachably connected to the bottom cover plate 3 by bolts. The mounting component 25 can be fixed to the connecting frame 4 by bolts or welding. In this way, the bottom cover plate 3 and the fixing component 2 are fixed together by the connecting frame 4, thereby improving the stability of the housing 1.

[0052] Optionally, a plane parallel to the bottom protective plate 3 is defined as the projection plane, and the orthographic projection of the housing 1 onto the projection plane is located inside the orthographic projection of the bottom protective plate 3 onto the projection plane. In this way, the area of ​​the bottom protective plate 3 is large enough to ensure the protective effect of the bottom protective plate 3 on the housing 1 and the battery module inside the housing 1.

[0053] Preferably, the housing 1 is cylindrical, and a portion of the fixing component 2 is capable of extending and retracting circumferentially along the housing 1. The cylindrical housing 1 has better pressure resistance and allows for further reduction in the wall thickness of the housing 1.

[0054] Furthermore, the battery pack includes multiple fixing components 2, which are spaced apart along the axial direction of the housing 1. Each fixing component 2 can apply force to the housing 1, thereby further improving the pressure resistance of the housing 1. Simultaneously, the multiple fixing components 2 also serve to secure the housing 1, thereby enhancing the stability of the housing 1.

[0055] like Figure 2 , Figure 3 and Figure 4 As shown, the housing 1 includes a cylindrical body 11 and two cylindrical covers 12. The cylindrical body 11 has two openings, and the two cylindrical covers 12 are respectively placed over the two openings and connected to the cylindrical body 11. Each cylindrical cover 12 has a liquid inlet, and the cylindrical body 11 has two liquid outlets. The battery pack also includes a BMS slave board, a BMS main board, an MSD51, a BDU52, a high-voltage connector 53, and a low-voltage connector 54. The MSD51, high-voltage connector 53, and low-voltage connector 54 are all fixed to the cylindrical covers 12. Multiple battery modules are connected via connectors. The MSD51 is connected to the connectors, and the MSD51 can be connected to the high-voltage connector 53 via copper busbars. The high-voltage connector 53 is connected to the BDU52. Multiple battery modules are connected to the BMS slave board, the BMS slave board is connected to the BMS main board, and the BMS main board is connected to the low-voltage connector 54. The number of low-voltage plugs 54 is greater than or equal to two. One low-voltage plug 54 is used to connect to the whole vehicle. At least one low-voltage plug 54 is connected to BDU52. BDU52 is located outside the housing 1 and can reduce the volume of housing 1, thereby reducing the required volume of oil and thus reducing the cost of battery pack.

[0056] Alternatively, the connecting busbar can be a copper busbar or an aluminum busbar.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model 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 utility model.

Claims

1. A fastening assembly comprising: The fixing assembly is used to fix the housing of the battery pack. The fixing assembly includes a bracket and a strapping member. The bracket and the strapping member are detachably connected. At least one of the strapping member and the bracket is a telescopic member. When the fixing component is installed on the housing, the bracket is connected to the strapping member, the strapping member and the bracket are respectively attached to the outer side wall of the housing, and the telescopic member is in an extended state.

2. The fixing component according to claim 1, characterized in that, The telescopic component includes a telescopic part and an extension part connected to each other. The extension part can fit against the outer wall of the housing. The middle part of the telescopic part protrudes away from the housing from the two ends of the telescopic part. The telescopic part can undergo elastic deformation.

3. The fixture assembly of claim 2, wherein, The number of the extensions is greater than or equal to two, and two adjacent extensions are connected by the telescopic part.

4. The fixture assembly of any one of claims 1-3, wherein, The fixing assembly further includes two first fixing members and two second fixing members, the two first fixing members being connected to both ends of the bracket, and the two second fixing members being connected to both ends of the binding member; The two first fasteners correspond to the two second fasteners respectively, and the first fasteners and the second fasteners corresponding to the first fasteners are detachably connected.

5. The fixing component according to any one of claims 1-3, characterized in that, The battery pack also includes a bottom protective plate, and the fixing assembly also includes a mounting member connected to the side of the bracket opposite to the strapping member, the mounting member being used to connect to the bottom protective plate.

6. A battery pack, characterized by, The battery pack includes a housing, multiple battery modules, and a fixing component as described in any one of claims 1-5. The housing encloses an installation cavity, and the multiple battery modules are all disposed within the installation cavity. The housing has an inlet and an outlet, both of which communicate with the installation cavity. The fixing component is clamped onto the housing.

7. The battery pack according to claim 6, characterized in that, The housing is cylindrical, and the telescopic member is capable of extending and retracting circumferentially along the housing.

8. The battery pack of claim 6, wherein, The battery pack also includes a connecting frame and a bottom protective plate. The fixing assembly is fixed to the connecting frame, and the connecting frame is detachably connected to the bottom protective plate.

9. The battery pack of claim 8, wherein, A plane parallel to the bottom protective plate is defined as the projection plane, and the orthographic projection of the housing on the projection plane is located inside the orthographic projection of the bottom protective plate on the projection plane.

10. The battery pack of claim 7, wherein, The battery pack includes multiple fixing components, which are arranged at intervals along the axial direction of the housing.

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