Connection assembly and battery pack housing

Abstract

The utility model provides a kind of connecting assembly and battery pack, it is related to power battery technical field, the connecting assembly includes first connecting piece and second connecting piece;First connecting piece includes bottom part, and main part is connected on bottom part, bottom part has bonding area and through-hole on it, bottom part is bonded on beam body by adhesive layer being arranged on bonding area, and is connected on beam body by fastener being passed through through-hole;Second connecting piece has connecting portion being connected with main part, and abutting portion being connected with connecting portion and abutting on the outside of battery pack shell, at least first connecting part for being connected with external mounting carrier is equipped on abutting portion.The connecting assembly of the utility model is connected by bonding area on bottom part and beam body, and the two connection modes of fastener being connected with beam body by passing through through-hole cooperate, when external mounting carrier vibrates or bears impact, it can still ensure that the first connection on beam body is firm and stable.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a connecting component and a battery pack housing. Background Technology

[0002] With the widespread application of power batteries, improving the connection of battery packs on mounting platforms such as vehicle bodies has become particularly important. Currently, battery packs are installed on mounting platforms primarily through a combination of a connecting structure located on the lower casing frame and a beam within the lower casing. This connecting structure is typically welded to the beam, a method that not only enhances the overall strength of the battery pack installation to the vehicle body but also improves its rigidity. However, because the connecting structure, located in the middle of the battery pack under load, experiences stress concentration, cracks can easily form at the welded locations when the mounting platform vibrates, thus affecting the overall rigidity and reliability of the battery pack.

[0003] In addition, traditional welding methods can reduce the strength of the beam to 60% to 75% of its strength before welding, and the weld bead is prone to poor control, resulting in defects such as slag inclusion, undercut, cracking, weld beads, and through-holes. Utility Model Content

[0004] In view of this, the present invention aims to provide a connection structure to improve the strength and reliability of the connection between the middle part of the battery pack and the external mounting carrier.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A connecting assembly is disposed on a beam inside a battery pack housing for connecting the battery pack to an external mounting carrier, the connecting assembly including a first connector and a second connector;

[0007] The first connector includes a bottom portion and a main body portion connected to the bottom portion. The bottom portion has an adhesive area and a through hole. The bottom portion is bonded to the beam by an adhesive layer provided on the adhesive area and is connected to the beam by a fastener passing through the through hole.

[0008] The second connector has a connecting portion that passes through the battery pack housing and is connected to the main body portion, and an abutting portion that is connected to the connecting portion and abuts against the outside of the battery pack housing. At least the abutting portion is provided with a first connecting portion for connecting to the external mounting carrier.

[0009] Furthermore, the bottom portion and the main body portion are connected in a T-shape, the adhesive area is located in the middle of the bottom portion, and the through holes are respectively provided at both ends of the bottom portion.

[0010] Furthermore, the bottom portion is elongated, and the through holes at at least one end of the bottom portion are two holes spaced apart along the width direction of the bottom portion.

[0011] Furthermore, the distance D between the two through holes located at the same end satisfies: 15mm≤D≤30mm.

[0012] Furthermore, the fastener includes a bolt, which is bolted to the beam body, and the bolt has a grade greater than or equal to 12.9.

[0013] Furthermore, the pull-out strength A and shear strength B between the bonding area and the beam body respectively satisfy: A≥9MPa, B≥7MPa; and / or, the first connecting portion includes threaded holes provided on the abutting portion and the connecting portion.

[0014] Furthermore, the thickness d of the adhesive layer satisfies: 0.5mm~1.5mm; the percentage C of the area of ​​the bonding region to the area of ​​the bottom part of the bottom surface satisfies: C≥70%.

[0015] Furthermore, the second connector has a connecting portion connected to the main body portion and an abutting portion connected to the connecting portion and capable of abutting against the outside of the battery pack housing, wherein the first connecting portion is at least partially disposed on the abutting portion.

[0016] Furthermore, the connecting portion is screwed to the main body portion; and / or, the first connecting portion is a threaded hole that connects the abutting portion and the connecting portion.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] The connecting component of this utility model combines two connection methods: bonding the first connector to the beam via an adhesive area on the bottom portion, and fasteners passing through through holes to connect to the beam. This combination increases the contact area between the first connector and the beam, ensuring the firmness and stability of the connection even when the external mounting carrier vibrates or experiences impact. This addresses the problem of cracks easily occurring in traditional welding methods, which can affect connection reliability. Furthermore, the adhesive area, while increasing the connection area between the first connector and the beam, also positions the first connector on the beam, improving fastener installation efficiency. Moreover, the combination of bonding and fasteners does not compromise the beam's inherent strength, allowing for full utilization of its strength and enhancing the stability and reliability of the connecting component during use.

[0019] Furthermore, the T-shaped connection between the bottom and main body sections, along with through holes at both ends of the bottom section, enhances the reliability and robustness of the first connector and the beam in the connected state. The arrangement of two spaced through holes at at least one end of the bottom section further improves the connection effect. The range of the distance D between the two through holes at the same end enhances the connection strength between the bottom section and the beam. The screw connection between the connecting part and the main body not only provides high connection strength and stability but also facilitates installation. Fasteners, including bolts, enhance the connection strength between the bottom section and the beam and facilitate installation. The use of bolts of grade 12.9 or higher (high-strength bolts) ensures that the bolts are less prone to breakage under high loads, guaranteeing the safety and stability of the connection between the bottom section and the beam. Good fatigue resistance ensures that bolts of grade 12.9 or higher maintain high strength and stability even after repeated loading and unloading, extending their service life.

[0020] Furthermore, the setting of the tensile and shear strength ranges between the bonding area and the beam body also helps to improve the connection strength between the bottom part and the beam body; the first connection part includes a threaded hole, which facilitates the connection between the connecting component and the external mounting carrier. The setting of the adhesive layer thickness range helps to ensure the required tensile and shear strength of the adhesive layer, and also prevents waste caused by excessive adhesive layer thickness; the setting of the percentage C of the area of ​​the bonding area to the area of ​​the bottom surface of the bottom part helps to ensure the tensile and shear strength of the adhesive layer.

[0021] Furthermore, the connecting portion of the second connector facilitates connection with the main body, enabling the second connector to be installed on the first connector. The abutting portion abuts against the outside of the battery pack housing, facilitating the sealing of the battery pack housing and installation on an external mounting carrier. The connecting portion is screwed to the main body, which is easy to implement and provides a good connection effect; the first connecting part is a threaded hole, which helps to improve the connection effect with the external mounting carrier.

[0022] In addition, another objective of this utility model is to provide a battery pack housing, wherein the battery pack housing has a beam inside, a frame outside, and a connecting component as described above on the beam, and a second connection point for connecting to the external mounting carrier on the frame.

[0023] The battery pack housing of this utility model facilitates the connection between the middle of the battery pack and the external mounting carrier through the connection components on the beam, and facilitates the connection between the outer side of the battery pack and the external mounting carrier through the frame, thereby improving the installation firmness and reliability of the battery pack on the external mounting carrier. Attached Figure Description

[0024] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0025] Figure 1 This is a schematic diagram of the connection component described in the embodiment of the present utility model in its use state;

[0026] Figure 2 This is an anatomical diagram of the connecting component described in an embodiment of the present utility model;

[0027] Figure 3 This is a cross-sectional view of the connecting component described in an embodiment of the present utility model;

[0028] Figure 4 This is a top view of the first connector described in an embodiment of the present utility model;

[0029] Figure 5 This is a simulation test result diagram of the connecting component described in this embodiment of the utility model using a welding method;

[0030] Figure 6 The figures show simulation test results of the connecting components described in this utility model embodiment using screw and adhesive methods.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Lower shell; 2. Beam; 3. Connecting components; 4. Fasteners;

[0033] 101. Frame; 1011. Connecting hole;

[0034] 201. Adhesive layer;

[0035] 301, First connector; 3011, Bottom part; 3012, Main body part; 3013, First threaded hole; 3014, Through hole; 302, Second connector; 3021, Connecting part; 3022, Abutting part; 3023, Second threaded hole. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0037] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "back" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] This embodiment relates to a connecting component 3, which is disposed on a beam 2 inside the battery pack housing, for connecting the middle part of the battery pack to an external mounting carrier. The connecting component 3 includes a first connector 301 and a second connector 302.

[0040] The first connector 301 includes a bottom portion 3011 and a main body portion 3012 connected to the bottom portion 3011. The bottom portion 3011 has an adhesive area and a through hole 3014. The bottom portion 3011 is bonded to the beam 2 by an adhesive layer 201 provided on the adhesive area and is connected to the beam 2 by a fastener 4 passing through the through hole 3014. The second connector 302 has a connecting portion 3021 that passes through the battery pack housing and is connected to the main body portion 3012, and an abutting portion 3022 that is connected to the connecting portion 3021 and abuts against the outside of the battery pack housing. At least the abutting portion 3022 is provided with a first connecting part for connecting to an external mounting carrier.

[0041] The connecting component 3 described in this embodiment is bonded to the beam 2 through the adhesive area on the bottom part 3011, and the fastener 4 is connected to the beam 2 through the through hole 3014. The combination of these two connection methods helps to increase the force-bearing contact area between the first connecting component 301 and the beam 2. When the external mounting carrier vibrates or is subjected to impact, the connection of the first connection to the beam 2 can still be ensured to be firm and stable. This helps to improve the problem that traditional welding methods are prone to cracking and affect the reliability of the connection.

[0042] Meanwhile, the adhesive area is bonded to the beam 2, increasing the connection area between the first connector 301 and the beam 2, and also positioning the first connector 301 on the beam 2, thereby improving the installation efficiency of the fastener 4. Furthermore, the adhesive layer 201 between the bottom part and the beam 2 also helps to improve the connection tightness of the fastener 4. The connection component of this embodiment, through the two connection methods of adhesive bonding and fastener 4, does not lose the strength of the beam 2 itself, thus making full use of the strength of the beam 2 itself, and also helping to improve the stability and reliability of the connection component 3 in use.

[0043] Based on the above overview, the structure of the connection component 3 in the usage state in this embodiment is as follows: Figure 1 As shown, the structure of the connecting component 3 is as follows: Figure 2 As shown in the figure. The battery pack housing in this embodiment includes an upper housing and a lower housing 1 that are fastened together. The lower housing 1 has a cavity with an open top. The upper housing is used to seal the open top of the cavity. The beam 2 is specifically disposed inside the lower housing 1.

[0044] As a preferred arrangement, such as Figure 1 As shown in the diagram, in this embodiment, multiple beams 2 are arranged within the lower housing 1, and these beams 2 are connected horizontally and vertically to divide the cavity into multiple sub-cavities. Connecting components 3 are located in the middle of two beams 2 to facilitate the connection of the middle portion of the battery pack to the external mounting carrier. It should be noted that the arrangement and number of beams 2, as well as the arrangement and number of connecting components 3, in this embodiment can be adaptively adjusted according to usage requirements, as long as the usage requirements are met.

[0045] In addition, the lower housing 1 is provided with a frame 101 on its outer periphery. The frame 101 can also be connected to the external mounting carrier, thereby cooperating with the connecting component 3 to ensure better connection reliability of the battery pack on the external mounting carrier. In this embodiment, the external mounting carrier can be a vehicle body or other products that require battery pack installation.

[0046] In a preferred embodiment, the bottom portion 3011 and the main body portion 3012 are connected in a T-shape, with the bonding area located in the middle of the bottom portion 3011, and through holes 3014 respectively located at both ends of the bottom portion 3011. This not only facilitates the processing and forming of the first connector 301, but also further improves the reliability and robustness of the first connector 301 and the beam 2 in the connected state.

[0047] In terms of specific structure, such as Figure 2 and Figure 3As shown, the bottom portion 3011 is elongated, and the through holes 3014 at each end of the bottom portion 3011 are two spaced apart along the width direction of the bottom portion 3011. Specifically, the bottom portion 3011 can be rectangular, and the main body portion 3012 is connected to the middle of the bottom portion 3011. In this embodiment, the main body portion 3012 is preferably columnar, but can also be prismatic. The bonding area is located in the middle of the bottom surface of the bottom portion 3011 and extends to both ends of the bottom portion 3011, which helps to further increase the connection area between the bottom portion 3011 and the beam 2 and the stability of the first connector 301 under stress.

[0048] In some embodiments, the distance D between two through holes 3014 located at the same end satisfies: 15mm ≤ D ≤ 30mm. It should be noted that the distance D between the two through holes 3014 specifically refers to the distance between the center lines of the two through holes 3014. This distance range helps to improve the connection strength between the bottom portion 3011 and the beam 2, preventing difficulties in arrangement due to excessively small distances between the two through holes 3014, and avoiding problems affecting the strength of the beam 2. In specific implementations, the distance D between the two through holes 3014 located at the same end can be, for example, 15mm, 20mm, 25mm, 28mm, or 30mm. Alternatively, it is also feasible to have two through holes 3014 at one end of the bottom portion 3011 and one through hole 3014 at the other end, which also improves the connection strength between the bottom portion 3011 and the beam 2.

[0049] In this embodiment, the pull-out strength A and shear strength B between the bonding area and the beam 2 satisfy: A≥9MPa, B≥7MPa. This setting of the pull-out and shear strength ranges between the bonding area and the beam 2 also helps to improve the connection strength between the bottom portion 3011 and the beam 2. Specifically, the adhesive layer 201 can be a high-strength structural adhesive, and the thickness d of the adhesive layer 201 satisfies: 0.5mm~1.5mm. The percentage C of the area of ​​the bonding area to the area of ​​the bottom surface of the bottom portion 3011 satisfies: C≥70%. By optimizing the thickness d of the adhesive layer 201 and the range of the percentage C of the area of ​​the bonding area to the area of ​​the bottom surface of the bottom portion 3011, it is beneficial to ensure that the pull-out strength A and shear strength B between the bonding area and the beam 2 meet the requirements.

[0050] In specific implementation, the pull-out strength A between the bonded area and the beam 2 can be, for example, 9 MPa, 9.25 MPa, or 9.5 MPa, and the shear strength B between the bonded area and the beam 2 can be, for example, 7 MPa, 7.25 MPa, or 7.5 MPa. The thickness d of the adhesive layer 201 can be, for example, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, or 1.5 mm. The percentage C of the area of ​​the bonded area to the area of ​​the bottom surface of the bottom portion 3011 can be, for example, 70%, 72%, 75%, 78%, 80%, 82%, or 85%.

[0051] As a preferred connection method, such as Figure 4 As shown in the diagram, the fastener 4 in this embodiment includes a bolt, which is screwed to the beam 2. The bolt has a simple structure, is easy to connect, and offers high connection stability. Specifically, the bolt can be M6 with a grade greater than or equal to 12.9. Using a grade greater than or equal to 12.9, i.e., a high-strength bolt, ensures that the bolt is not easily broken under high loads, thus guaranteeing the safety and stability of the connection between the bottom part 3011 and the beam 2. Good fatigue resistance allows the bolt, with a grade greater than or equal to 12.9, to maintain high strength and stability even after repeated loading and unloading, extending its service life. Of course, besides bolts, other connection structures that can achieve the connection between the bottom part 3011 and the beam 2 can also be used for the fastener 4.

[0052] In this embodiment, by selecting the range of two parameters, the thickness d of the adhesive layer 201 and the percentage C of the area of ​​the bonding area to the bottom surface of the bottom part 3011, the connection strength between the first connector 301 and the beam 2 can be improved, thereby improving the impact resistance of the battery pack under vibration conditions, and the connecting component 3 has stronger resistance to deformation and is less prone to cracking failure.

[0053] In some implementations, such as Figure 2 As shown, the second connector 302 has a connecting portion 3021 connected to the main body portion 3012, and an abutting portion 3022 connected to the connecting portion 3021 and abutting against the outside of the battery pack housing. The first connecting portion is at least partially provided on the abutting portion 3022. The connecting portion 3021 of the second connector 302 is preferably screwed to the main body portion 3012. Specifically, the connecting portion 3021 has an external thread on its outer peripheral wall, and the main body portion 3012 has a threaded hole with an internal thread. To distinguish it from the threaded hole described below, the threaded hole on the main body portion 3012 is referred to as the first threaded hole 3013. The abutting portion 3022 protrudes radially outward along the connecting portion 3021, such that the diameter of the abutting portion 3022 is larger than the diameter of the connecting portion 3021.

[0054] In this embodiment, when installing the connecting component 3, the bottom portion 3011 of the first connecting member 301 is first bonded to the beam 2, and then both ends of the bottom portion 3011 are screwed to the beam 2 respectively using bolts. Next, the upper housing is installed on the lower housing 1. Then, the connecting portion 3021 on the second connecting member 302 is screwed into the first threaded hole 3013 on the main body portion 3012 until the abutting portion 3022 abuts against the upper housing. To improve the sealing effect of the battery pack housing, a sealing ring or other sealing structure can also be provided between the abutting portion 3022 and the upper housing.

[0055] In addition, in this embodiment, the first connecting part is a threaded hole connecting the abutment part 3022 and the connecting part 3021. For ease of description, the threaded hole on the second connecting part 302 is referred to as the second threaded hole 3023. After passing through the external mounting carrier, the bolt can be screwed into the second threaded hole 3023, thereby connecting the middle part of the battery pack to the external mounting carrier and realizing the hoisting of the middle part of the battery pack on the external mounting carrier. The thread length of the bolt connected to the second threaded hole 3023 should be greater than four thread pitches to ensure connection strength.

[0056] In this embodiment, a vibration simulation test was conducted on the battery pack casing according to the GB38031-2020 standard for safety requirements of power batteries for electric vehicles. The simulation test was conducted for two different connection methods between the connecting components and the beams within the battery pack casing. Figure 5 The beams inside the battery pack housing are fixed to the connecting components by welding. Figure 6 The beams and connecting components within the battery pack housing are fixed using a combination of bolts and adhesive bonding. Test results show that the vibration stress of the connecting components fixed by welding is 36.23 MPa, while the vibration stress of the connecting components fixed using the combination of bolts and adhesive bonding in this embodiment is 29.67 MPa. This demonstrates that the combination of bolts and adhesive bonding in this embodiment can prevent stress concentration at the welding location, which could lead to weld cracking. Furthermore, this embodiment also relates to a battery pack housing, with a beam 2 inside and a frame 101 outside. The beam 2 is equipped with the aforementioned connecting components, and the frame 101 has a second connection point for connecting to an external mounting carrier.

[0057] The frame 101 is specifically set on the lower housing 1, and the second connection point can be a connection hole set on the frame 101. The structure is simple and easy to arrange and implement. At the same time, it can be connected to the external mounting carrier with the help of the connector.

[0058] The battery pack housing described in this embodiment facilitates the connection between the middle of the battery pack and the external mounting carrier through the connection component 3 on the beam 2, and facilitates the connection between the outer side of the battery pack and the external mounting carrier through the frame 101, thereby improving the installation firmness and reliability of the battery pack on the external mounting carrier.

[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A connecting assembly, disposed on a beam within a battery pack housing, for connecting the battery pack to an external mounting carrier, characterized in that: The connection component includes a first connector and a second connector; The first connector includes a bottom portion and a main body portion connected to the bottom portion. The bottom portion has an adhesive area and a through hole. The bottom portion is bonded to the beam by an adhesive layer provided on the adhesive area and is connected to the beam by a fastener passing through the through hole. The second connector passes through the battery pack housing and is connected to the main body. The second connector is provided with a first connection portion for connecting to the external mounting carrier.

2. The connection component according to claim 1, characterized in that: The bottom portion and the main body portion are connected in a T-shape, the adhesive area is located in the middle of the bottom portion, and the through holes are respectively provided at both ends of the bottom portion.

3. The connecting component according to claim 2, characterized in that: The bottom portion is elongated, and the through holes at at least one end of the bottom portion are two holes spaced apart along the width direction of the bottom portion.

4. The connecting component according to claim 3, characterized in that: The distance D between the two through holes located at the same end satisfies: 15mm≤D≤30mm.

5. The connection component according to claim 1, characterized in that: The fasteners include bolts, which are bolted to the beam body, and the bolts are of grade 12.9 or higher.

6. The connecting component according to claim 1, characterized in that: The second connector has a connecting portion connected to the main body portion and an abutting portion connected to the connecting portion and capable of abutting against the outside of the battery pack housing, wherein the first connecting portion is at least partially disposed on the abutting portion.

7. The connecting component according to claim 6, characterized in that: The tensile strength A and shear strength B between the bonded area and the beam body respectively satisfy: A≥9MPa, B≥7MPa; and / or, The first connecting portion includes a threaded hole provided on the abutting portion and the connecting portion.

8. The connecting component according to claim 7, characterized in that: The thickness d of the adhesive layer satisfies: 0.5mm~1.5mm; and / or, The percentage C of the area of ​​the bonding region to the area of ​​the bottom surface of the bottom portion satisfies: C≥70%.

9. The connecting component according to claim 6, characterized in that: The connecting portion is screwed to the main body portion; and / or The first connecting part is a threaded hole that connects the abutting part and the connecting part.

10. A battery pack housing, characterized in that: The battery pack housing has a beam inside and a frame outside, and the beam has a connecting component as described in any one of claims 1 to 9, and the frame has a second connecting part for connecting to the external mounting carrier.

Images