Battery pack and equipotential connection structure thereof

Abstract

The utility model provides a battery pack and its equipotential connection structure, the equipotential connection structure of the utility model comprises a conductive support and an elastic conductive part which are arranged in a battery pack shell, the conductive support is connected with a frame or a beam body in the battery pack shell, and the elastic conductive part is connected with the conductive support. And the conductive bracket compresses the elastic conductive part on a liquid cooling plate at the bottom of the battery pack shell, so that equipotential connection between the liquid cooling plate and the battery pack shell is formed. According to the equipotential connection structure, based on the arrangement of the elastic conductive part, the problem that the contact resistance of an equipotential connection structure in the prior art is easily increased due to factors such as mechanical vibration, temperature circulation and external corrosion is solved, and the continuous stability of the equipotential effect is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an equipotential bonding structure for a battery pack. Furthermore, this utility model also relates to a battery pack incorporating this structure. Background Art

[0002] Potential equalization is a key factor in ensuring system stability and safety, especially in the integrated design of battery pack casing and liquid cooling plate manufactured by roll forming process. Achieving efficient and reliable equipotential connection between the two is the goal pursued by battery manufacturers.

[0003] In existing technologies, the battery pack casing and the liquid cooling plate are mostly fixed by traditional mechanical methods, such as adding conductive pads or masking with conductive paint. Although this method can achieve a certain degree of electrical conductivity, long-term use can easily lead to increased contact resistance due to factors such as mechanical vibration, temperature cycling, and external corrosion, which affects the continuous stability of the equipotential effect. Utility Model Content

[0004] In view of this, the present invention aims to propose an equipotential connection structure for a battery pack to improve the stability of the equipotential effect between the battery pack casing and the liquid cooling plate.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] An equipotential bonding structure for a battery pack includes a conductive support and an elastic conductive component disposed within the battery pack housing.

[0007] The conductive bracket is connected to the frame or beam in the battery pack housing, and the conductive bracket presses the elastic conductive component against the liquid cooling plate located at the bottom of the battery pack housing to form an equipotential connection between the liquid cooling plate and the battery pack housing.

[0008] Furthermore, the elastic conductive component includes a foam body, and at least a portion of the foam body is covered with a conductive film.

[0009] Furthermore, the conductive support is L-shaped and includes a first connecting plate connected to the frame or the beam, and a second connecting plate connected to the first connecting plate, wherein the second connecting plate presses the elastic conductive component against the liquid cooling plate.

[0010] Furthermore, the first connecting plate is connected to the housing via a fastening assembly.

[0011] Furthermore, the fastening assembly includes a screw connector and a rivet nut disposed on the housing, wherein the screw connector passes through the first connecting plate and is screwed into the rivet nut; and / or, the first connecting plate is fitted to the frame or the beam, and the second connecting plate is arranged parallel to the liquid cooling plate.

[0012] Furthermore, the ratio of the compressed thickness s of the elastic conductive component to its own thickness a is between 0.35 and 0.8; and / or, the height h of the conductive bracket satisfies the relationship: h ≥ t + R1 + R2 + c, where t is the thickness of the second connecting plate, R1 is the radius of the rounded corner between the first connecting plate and the second connecting plate, R2 is the flange diameter of the screw connector, and c is the minimum distance between the flange edge of the screw connector and the rounded corner edge.

[0013] Furthermore, the frame or the beam is provided with a first mounting hole, the first connecting plate is provided with a second mounting hole, the rivet nut is provided in the first mounting hole, and the screw is sequentially passed through the second mounting hole and the rivet nut. The distance L between the first mounting hole and the liquid cooling plate satisfies the following relationship: L=s+t+R1+c+(R2 / 2)+b, where b is the sum of the tolerance value of the first mounting hole, the tolerance value of the second mounting hole, the tolerance value of the thickness t of the second connecting plate, and the height tolerance value of the frame or the beam.

[0014] Furthermore, the height dimension H of the frame or the beam satisfies the relationship: H≥L max +R3+R4, where L max R is the maximum value of L, R3 is the radius of the first mounting hole, and R4 is the radius of the rounded corner between the top wall and the side wall of the frame or the beam.

[0015] Furthermore, the conductive film is made of PI tin-plated film; and / or, the conductive support is made of steel.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] The equipotential bonding structure of the battery pack described in this invention allows the elastic conductive component to absorb vibration energy through its own elastic deformation when subjected to mechanical vibration, thereby maintaining good contact with the liquid cooling plate. The continuous pressure provided by the conductive bracket ensures that even under vibration conditions, the elastic conductive component can still be tightly fitted to maintain stable contact. Furthermore, the elastic conductive component can compensate for thermal expansion or contraction caused by temperature changes, ensuring good contact at different temperatures and guaranteeing the stability of the equipotential effect.

[0018] Furthermore, the elastic conductive component uses a foam body, which can absorb and buffer mechanical vibrations and has the characteristics of corrosion resistance and temperature resistance. In addition, the conductive film has high conductivity, so the combination of the conductive film and the foam body can ensure that the contact surface between the elastic conductive component and the liquid cooling plate always maintains good conductive contact under different pressure conditions and adapts to different environments.

[0019] Furthermore, the first connecting plate connects to the frame or beam, facilitating the installation and arrangement of the L-shaped bracket. The second connecting plate evenly distributes pressure onto the elastic conductive components, maximizing the contact area between the components and the liquid cooling plate, thereby reducing contact resistance. Simultaneously, the combination of screws and rivet nuts ensures easy disassembly of the first connecting plate from the housing. This combination also provides reliable fastening, preventing loosening due to vibration or other external forces, and ensuring a more reliable and stable equipotential connection between the battery pack housing and the liquid cooling plate.

[0020] The ratio of the compressed thickness s of the elastic conductive component to its own thickness a is between 0.35 and 0.8, which allows the elastic conductive component to maintain sufficient compressive contact force, ensuring a good electrical connection between the liquid cooling plate and the battery pack casing. Even after vibration or temperature changes, the elastic conductive component can still provide stable conductivity and prevent poor contact or disconnection.

[0021] Furthermore, the distance L between the first mounting hole and the liquid cooling plate satisfies the following relationship: L=s+t+R1+(R2 / 2)+b, where t+R1+c+(R2 / 2) is the distance from the second mounting hole to the bottom of the second connecting plate, and b is the tolerance generated during production and processing. This ensures that when processing the first mounting hole, the influence of the tolerance is eliminated, and that the elastic conductive component meets the acceptable compression ratio after assembly.

[0022] Another objective of this invention is to provide a battery pack, wherein the battery pack is provided with an equipotential bonding structure as described above.

[0023] The battery pack of this utility model is provided with the above-mentioned equipotential connection structure, which, compared with the traditional technology, eliminates the potential difference between the liquid cooling plate and the battery pack shell, thereby reducing the risk of accidental electric shock. Furthermore, it avoids the generation of sparks during disassembly or maintenance, thus preventing fires or explosions, and has good practicality. 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 1This is a schematic diagram of the structure of the battery pack housing according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the equipotential bonding structure described in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the first mounting hole described in an embodiment of the present utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the rivet nut in the first mounting hole according to an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the fastening assembly described in an embodiment of the present invention;

[0030] Figure 6 This is a structural schematic diagram of the height of the conductive support described in an embodiment of the present invention;

[0031] Figure 7 This is a structural schematic diagram of the height of the first mounting hole according to an embodiment of the present utility model;

[0032] Figure 8 This is a structural schematic diagram of the beam height described in an embodiment of the present utility model;

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Conductive support; 101. First connecting plate; 102. Second connecting plate; 103. Second mounting hole;

[0035] 2. Elastic conductive component; 201. Foam body; 202. Conductive film;

[0036] 3. Beam body; 301. First mounting hole;

[0037] 4. Liquid cooling plate;

[0038] 5. Fastening components; 501. Screw connectors; 502. Rivet nuts;

[0039] 6. Battery pack casing; 7. Equipotential bonding structure. DETAILED DESCRIPTION

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0041] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0042] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" 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.

[0043] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can be a mechanical connection or an electrical connection; they can be a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0044] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] Example 1

[0046] This embodiment relates to an equipotential bonding structure 7 for a battery pack. In terms of overall structure, as follows... Figures 1 to 8 As shown, it includes a conductive support 1 and an elastic conductive component 2 disposed within the battery pack housing 6. Furthermore, the conductive support 1 is connected to the frame or beam 3 in the battery pack housing 6, and the conductive support 1 presses the elastic conductive component 2 against the liquid cooling plate 4 located at the bottom of the battery pack housing 6 to form an equipotential connection between the liquid cooling plate 4 and the battery pack housing 6.

[0047] At this time, as set up above, the elastic conductive part can be pressed tightly onto the liquid cooling plate 4 by the conductive bracket 1 on the battery pack housing 6, so that the potential difference between the liquid cooling plate 4 and the battery pack housing 6 is zero, achieving a potential balance state and completing the equipotential connection. When the battery pack is subjected to mechanical vibration, the elastic conductive part 2 can absorb the vibration energy through its own elastic deformation, thereby maintaining good contact with the liquid cooling plate 4. At the same time, the continuous pressure provided by the conductive bracket 1 ensures that even under vibration conditions, the elastic conductive part 2 can still be tightly attached to the liquid cooling plate 4, maintaining stable contact. Furthermore, the elastic conductive part 2 can compensate for thermal expansion or contraction caused by temperature changes, ensuring good contact at different temperatures and guaranteeing the stability of the equipotential effect between the liquid cooling plate 4 and the battery pack housing 6.

[0048] Based on the above overview, in detail, in this embodiment, the beam 3 includes a horizontal beam and a vertical beam disposed within the frame. The conductive bracket 1 in this embodiment is particularly suitable for placement on the side wall of the horizontal beam. Meanwhile, any structural parts not mentioned in the battery pack housing 6 in this embodiment can be referred to from the various structures in battery pack products well-known to those skilled in the art, and will not be elaborated upon here.

[0049] In this embodiment, as a preferred implementation, see [reference needed]. Figure 3 As shown, the elastic conductive component 2 includes a foam body 201, and at least a portion of the foam body 201 is covered with a conductive film 202. The foam body 201 has good elasticity, can deform under pressure, and returns to its original shape after the external force is removed. Furthermore, the foam material has certain corrosion resistance and temperature resistance properties, allowing it to be used in harsh environments and over a wide temperature range.

[0050] Furthermore, by utilizing the aforementioned characteristics of the foam body 201 and the high conductivity of the conductive film 202, the combination of the conductive film 202 and the foam body 201 ensures that the contact surface between the elastic conductive component 2 and the liquid cooling plate 4 maintains good conductive contact under different pressure conditions, and adapts to different environments. Also, when the conductive support 1 presses the foam body 201 firmly onto the liquid cooling plate 4 located at the bottom of the battery pack housing 6, the foam body 201 can evenly distribute the external force on the contact surface, ensuring that each part of the contact surface is subjected to uniform pressure, thus better maintaining the equipotential connection between the battery pack housing 6 and the liquid cooling plate 4.

[0051] It should be mentioned that the foam body 201 in this embodiment is designed in a block shape. The fact that at least part of the foam body 201 is covered with a conductive film 202 in this embodiment means that the top surface and bottom surface of the foam body 201, as well as at least one side surface connecting the top surface and the bottom surface, are covered with a conductive film 202, thereby ensuring the purpose of achieving equipotential connection.

[0052] Furthermore, in this embodiment, as a preferred implementation, see [reference needed]. Figure 5 As shown, the conductive support 1 is L-shaped and includes a first connecting plate 101 connected to the frame or beam 3, and a second connecting plate 102 connected to the first connecting plate 101. The second connecting plate 102 presses the elastic conductive component 2 onto the liquid cooling plate 4. The first connecting plate 101 is responsible for connecting to the frame or beam 3, ensuring the fixed position of the conductive support 1, making it easier to install the conductive support 1 on the frame or beam 3. The second connecting plate 102 can evenly distribute the pressure onto the elastic conductive component 2, ensuring that the contact area between the elastic conductive component 2 and the liquid cooling plate 4 is maximized, thereby reducing the contact resistance.

[0053] Although equipotential bonding can also be achieved when the foam body 201 is pressed directly onto the liquid cooling plate 4 at the bottom of the battery pack housing 6 through the battery pack housing 6, compared to pressing the foam body 201 onto the liquid cooling plate 4 at the bottom of the battery pack housing 6 through the conductive bracket 1 in this embodiment, the pressure applied by the housing during direct pressing may not be uniform, especially in the case of housing deformation or vibration, which may lead to unstable contact, thereby affecting conductivity and resulting in poor stability.

[0054] Conversely, the conductive bracket 1 can evenly transmit pressure to the foam body 201, ensuring that the contact area between the foam body 201 and the liquid cooling plate 4 is maximized, reducing contact resistance. Furthermore, the conductive bracket 1 is fixed by the fastening component 5, making it easier to disassemble and replace the foam body 201. By replacing the conductive bracket 1 with different sizes, the contact pressure between the foam body 201 and the liquid cooling plate 4 can be flexibly adjusted, enabling a more stable equipotential connection between the battery pack housing 6 and the liquid cooling plate 4.

[0055] In this embodiment, as a preferred implementation, see [reference needed]. Figure 2 As shown, the first connecting plate 101 is connected to the housing via a fastening assembly 5. The fastening assembly 5 includes a screw connector 501 and a rivet nut 502 disposed on the housing. The screw connector 501 passes through the first connecting plate 101 and is screwed into the rivet nut 502. The first connecting plate 101 is fitted to the frame or beam 3, and the second connecting plate 102 is arranged parallel to the liquid cooling plate 4.

[0056] The screw connector 501 and the rivet nut 502 work together to ensure a tight connection between the first connecting plate 101 and the battery pack housing 6. The combination of the screw connector 501 and the rivet nut 502 can provide a reliable fastening effect, prevent loosening caused by vibration or other external forces, and ensure a more reliable and stable equipotential connection between the battery pack housing 6 and the liquid cooling plate 4.

[0057] Furthermore, the first connecting plate 101 being fitted to the frame or beam 3 can enhance the strength of the entire structure and ensure that the conductive bracket 1 will not deform when subjected to external force. The second connecting plate 102 being arranged parallel to the liquid cooling plate 4 can ensure that the elastic conductive component 2 is evenly pressed onto the liquid cooling plate 4 when subjected to pressure, avoiding damage caused by excessive local pressure, and maximizing the contact area between the elastic conductive component 2 and the liquid cooling plate 4, reducing contact resistance and improving conductivity.

[0058] It should be noted that in this embodiment, as a preferred implementation, see [reference needed]. Figure 6 As shown, the ratio of the compressed thickness *s* of the elastic conductive component 2 to its own thickness *a* is between 0.35 and 0.8. This allows the elastic conductive component 2 to maintain sufficient compressive contact force, ensuring a good electrical connection between the liquid cooling plate 4 and the battery pack housing 6. Even under vibration or temperature changes, the elastic conductive component 2 can still provide stable conductivity, preventing poor contact or disconnection. Furthermore, within a compression ratio range of 0.35 to 0.8, the elastic conductive component 2 maintains good elastic recovery capability, quickly returning to its original shape, ensuring long-term reliability.

[0059] The height h of the conductive bracket 1 satisfies the following relationship: h≥t+R1+R2+c, where t is the thickness of the second connecting plate 102, R1 is the radius of the rounded corner between the first connecting plate 101 and the second connecting plate 102, R2 is the flange diameter of the screw connector 501, and c is the minimum distance between the flange edge and the rounded corner edge of the screw connector 501.

[0060] Preferably, the thickness of the foam body 201 is 20 mm. A 20% compression (4 mm) results in a 16 mm thickness, and a 65% compression (13 mm) results in a 7 mm thickness. At this compression, the contact resistance between the foam body 201 and the contact surface is minimized. Insufficient compression leads to insufficient contact pressure and increased contact resistance. Excessive compression may cause overly tight contact between the contact surfaces, potentially resulting in permanent deformation of the material and affecting conductivity. Furthermore, under vibration conditions, appropriate compression ensures that the elastic conductive component 2 maintains stable contact even when subjected to vibration, preventing poor contact due to vibration.

[0061] However, the rounded corner design between the first connecting plate 101 and the second connecting plate 102 in the conductive bracket 1 can reduce stress concentration, improve the strength of the connection, and ensure that the conductive bracket 1 is not easily deformed when subjected to external force. In addition, the "+R1+R2" in the height relationship of the conductive bracket 1 is to prevent interference between the flange of the bolt 501 and the rounded corner between the first connecting plate 101 and the second connecting plate 102 during the tightening process.

[0062] In addition, the "+c" in the height relationship of the conductive bracket 1 is to ensure that when the bolted part 501 is fixed to the second connecting plate 102, its upper flange is completely abutted against the second connecting plate 102. This can ensure that the contact area between the flange and the connecting plate is maximized and the connection stability is maintained. The minimum distance between the flange edge and the rounded corner edge of the bolted part 501 is ≥2mm to ensure that the flange surface of the bolted part 501 does not press against the rounded corner and cause torque attenuation when it is assembled.

[0063] In this embodiment, as a preferred implementation, see [reference needed]. Figure 3 and Figure 7 As shown, the frame or beam 3 is provided with a first mounting hole 301, the first connecting plate 101 is provided with a second mounting hole 103, the rivet nut 502 is provided in the first mounting hole 301, and the screw connector 501 is sequentially passed through the second mounting hole 103 and the rivet nut 502. The distance L between the first mounting hole 301 and the liquid cooling plate 4 satisfies the following relationship: L=s+t+R1+c+(R2 / 2)+b, where b is the sum of the tolerance values ​​of the first mounting hole 301, the second mounting hole 103, the thickness t of the second connecting plate 102, and the height tolerance value of the frame or beam 3.

[0064] The beam 3 includes a crossbeam and a longitudinal beam disposed within the battery pack housing 6. The crossbeam and longitudinal beam are vertically arranged. A first mounting hole 301 can be provided on either the crossbeam or the longitudinal beam. The tolerance value of the first mounting hole 301 is ±1.5 mm. The tolerance value of the second mounting hole 103 is ±0.5 mm. The tolerance value of the thickness dimension t of the second connecting plate 102 is 0.5 mm. The height tolerance value of the frame or beam 3 is ±0.3 mm. It is worth noting that the height tolerance value of the frame or beam 3 refers to the distance between the bottom of the frame or beam 3 and the bottom of the foam body 201. Therefore, the maximum value of b = 1.5 + 0.5 + 0.5 + 0.3 = 2.8 mm, and the minimum value of b = -1.5 - 0.5 - 0.5 - 0.3 = -2.8 mm.

[0065] The distance from the second mounting hole 103 to the bottom of the second connecting plate 102 is t+R1+c+(R2 / 2)=15.5mm. As mentioned above, the maximum value of s is 16mm and the minimum value is 7mm. Therefore, in order to ensure that the conductive bracket 1 can be compressed to the foam body 201 to achieve the equipotential effect, the maximum value of L is 16+15.5+(-2.8)=28.7mm and the minimum value is 7+15.5+2.8=25.3mm.

[0066] Therefore, when the maximum opening height is between 25.3 mm and 28.7 mm, the conductive bracket 1 can be compressed to the foam body 201 to achieve the equipotential effect between the liquid cooling plate 4 and the battery pack housing 6.

[0067] In this embodiment, as a preferred implementation, see [reference needed]. Figure 8 As shown, the height dimension H of the frame or beam 3 satisfies the following relationship: H≥Lmax+R3+R4, where Lmax is the maximum value of L, R3 is the radius dimension of the first mounting hole 301, and R4 is the radius dimension of the rounded corner between the top wall and the side wall of the frame or beam 3.

[0068] In the field of battery pack technology, square tubes are usually used as beam 3. They have high strength, and square tubes are readily available from a wide range of suppliers in the national standard parts market, making procurement more convenient. Square tubes with a height of 50 mm or two 20 mm / 30 mm square tubes can be welded together along the height direction, so that the overall height after welding satisfies H≥Lmax+R3+R4.

[0069] In this embodiment, as a preferred implementation, the conductive film 202 is made of PI tin-plated film, and the conductive support 1 is made of steel. The tin-plated film has good conductivity, which can ensure that the conductive film 202 provides a stable conductive path when compressing the foam. The PI tin-plated film has good corrosion resistance, especially in humid or corrosive environments, which can protect the foam body 201 from corrosion.

[0070] The PI tin-plated film also possesses a certain degree of flexibility, maintaining good contact with the compression and rebound of the foam body 201. The PI tin-plated film provides excellent conductivity, corrosion resistance, and thermal stability, while the steel material offers high strength, conductivity, corrosion resistance, and high processability. The combination of these two materials ensures a stable conductive path for the foam body 201 during compression, achieving a stable equipotential connection between the liquid cooling plate 4 and the battery pack housing 6.

[0071] By defining the specific dimensions of the height positions of the conductive bracket 1, the first mounting hole 301, and the second mounting hole 103 as described above, the stability between the liquid cooling plate and the battery pack housing is ensured.

[0072] Example 2

[0073] This embodiment relates to a battery pack, which includes an equipotential bonding structure 7 as described in Embodiment 1. By assembling the equipotential bonding structure 7 of Embodiment 1, the battery pack of this embodiment maintains a stable equipotential between the battery pack housing 6 and the liquid cooling plate 4 even when subjected to mechanical vibration, temperature cycling, external corrosion, and other factors.

[0074] 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. An equipotential bonding structure for a battery pack, characterized in that: Includes conductive supports and elastic conductive components disposed within the battery pack housing; The conductive bracket is connected to the frame or beam in the battery pack housing, and the conductive bracket presses the elastic conductive component against the liquid cooling plate located at the bottom of the battery pack housing to form an equipotential connection between the liquid cooling plate and the battery pack housing.

2. The equipotential bonding structure of the battery pack according to claim 1, characterized in that: The elastic conductive component includes a foam body, and at least a portion of the foam body is covered with a conductive film.

3. The equipotential bonding structure of the battery pack according to claim 2, characterized in that: The conductive support is L-shaped and includes a first connecting plate connected to the frame or the beam, and a second connecting plate connected to the first connecting plate, wherein the second connecting plate presses the elastic conductive component against the liquid cooling plate.

4. The equipotential bonding structure of the battery pack according to claim 3, characterized in that: The first connecting plate is connected to the housing via a fastening assembly.

5. The equipotential bonding structure of the battery pack according to claim 4, characterized in that: The fastening assembly includes a threaded connector and a rivet nut disposed on the housing, wherein the threaded connector passes through the first connecting plate and is threaded into the rivet nut; and / or The first connecting plate is fitted to the frame or the beam, and the second connecting plate is arranged parallel to the liquid cooling plate.

6. The equipotential bonding structure of the battery pack according to claim 5, characterized in that: The ratio of the compressed thickness *s* of the elastic conductive component to its own thickness *a* is between 0.35 and 0.8; and / or, The height h of the conductive bracket satisfies the following relationship: h ≥ t + R1 + R2 + c, where t is the thickness of the second connecting plate, R1 is the radius of the rounded corner between the first connecting plate and the second connecting plate, R2 is the flange diameter of the screw connector, and c is the minimum distance between the flange edge of the screw connector and the rounded corner edge.

7. The equipotential bonding structure of the battery pack according to claim 5, characterized in that: The frame or the beam is provided with a first mounting hole, the first connecting plate is provided with a second mounting hole, the rivet nut is provided in the first mounting hole, and the screw is sequentially passed through the second mounting hole and the rivet nut; The distance L between the first mounting hole and the liquid cooling plate satisfies the following formula: L=s+t+R1+c+(R2 / 2)+b, where b is the sum of the tolerance values ​​of the first mounting hole, the second mounting hole, the thickness t of the second connecting plate, and the height tolerance value of the frame or the beam.

8. The equipotential bonding structure of the battery pack according to claim 7, characterized in that: The height H of the frame or the beam satisfies the following relationship: H≥L max +R3+R4, where, L max R is the maximum value of L, R3 is the radius of the first mounting hole, and R4 is the radius of the rounded corner between the top wall and the side wall of the frame or the beam.

9. The equipotential bonding structure of the battery pack according to any one of claims 2 to 8, characterized in that: The conductive film is made of PI tin-plated film; and / or the conductive support is made of steel.

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

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