Battery hanging lug connecting assembly and battery pack

Abstract

The utility model provides a battery hanger connecting assembly and a battery pack, and the battery hanger connecting assembly comprises an upper sleeve which is arranged between a cross beam and a box cover; the upper nut penetrates through the box cover and is in threaded connection with the upper end of the upper sleeve; the first sealing piece is used for sealing the joints of the upper sleeve, the upper nut and the box cover; the upper end of the lower sleeve penetrates through the bottom plate and the cross beam and is in threaded connection with the upper sleeve, and the lower end is in contact with the inner side of the bottom plate; the lower nut is arranged on the outer side of the bottom plate and is in threaded connection with the lower sleeve; the second sealing piece is used for sealing the joint of the lower sleeve, the lower nut and the bottom plate. The upper sleeve and the lower sleeve are connected through threads, integrated design is replaced, the length of parts and the overall machining difficulty are reduced, and meanwhile the production cost is reduced; and the sealing pieces are arranged between the upper sleeve and the upper nut and between the lower sleeve and the lower nut, so that the sealing performance of the joints is ensured, external impurities, moisture and the like are prevented from entering the battery pack, and the sealing reliability of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery hanging ear connection assembly and a battery pack. Background Art

[0002] In the absence of significant improvements in current battery cell energy density, extending battery life is typically achieved by increasing the size of the battery pack. However, as the battery pack grows in size, its overall stability becomes a pressing issue. To ensure structural stability during use, a mounting bracket assembly is often installed in the middle of the battery pack to increase its overall rigidity.

[0003] In existing battery pack designs, the mounting bracket assembly is typically connected to the chassis via a base plate and a top cover. Long bolts then penetrate the entire mounting bracket assembly to secure the battery pack to the vehicle chassis. The existing mounting bracket assembly design includes a support tube, a connecting tube, a seal, and fasteners. The support tube extends from the base plate into the middle support beam. A flange structure at the bottom is fixed to the base plate via fasteners. The upper end of the support tube is fixed to the top cover via a connecting tube.

[0004] However, existing solutions have some significant drawbacks. First, the ear-mounted connector assembly primarily serves to connect the entire housing structure, with insufficient consideration given to the housing's sealing performance. Poor sealing can lead to battery leakage and short circuits, shortening the battery's lifespan. Second, the integrated design of the support tube results in an excessively long overall length, making processing difficult and costly. Utility Model Content

[0005] In view of this, the present invention proposes a battery hook connection assembly and a battery pack to solve the problems of existing battery hook connection assemblies, such as high processing difficulty, high manufacturing cost, and difficulty in effectively meeting the sealing requirements of the battery pack box.

[0006] The technical solution of the present utility model is achieved as follows:

[0007] In a first aspect, the present invention provides a battery mounting ear connection assembly, comprising:

[0008] an upper sleeve, used for being arranged between the crossbeam and the box cover;

[0009] An upper nut is provided on the top surface of the box cover and passes through the box cover to be threadedly connected to the upper end of the upper sleeve. A through hole is provided at the central axis of the upper nut;

[0010] The first sealing member is located between the top surface of the upper sleeve and the upper nut, and is used to achieve sealing at the connection between the upper sleeve, the upper nut and the box cover;

[0011] The lower sleeve has an upper end for passing through the bottom plate and the crossbeam and being threadedly connected to the inner wall of the lower end of the upper sleeve, and a lower end for contacting the inner side of the bottom plate;

[0012] A lower nut is arranged on the outside of the bottom plate and is threadedly connected to the lower sleeve;

[0013] The second sealing member is located between the lower sleeve and the lower nut and is used to achieve sealing at the connection between the lower sleeve, the lower nut and the bottom plate.

[0014] On the basis of the above technical solution, preferably, the lower sleeve includes a hollow rod body, an annular flange and a threaded sleeve, the annular flange is fixedly arranged at the bottom end of the hollow rod body, the threaded sleeve is formed by extending in the axial direction of the bottom end of the hollow rod body, the upper end of the hollow rod body is used to pass through the bottom plate and the cross beam and be threadedly connected to the inner wall of the lower end of the upper sleeve, the bottom plate is arranged on the outside of the annular flange, and the threaded sleeve passes through the bottom plate, the lower nut is threadedly connected to the threaded sleeve, and the second sealing member is located between the annular flange and the lower nut.

[0015] Further, preferably, a first annular groove is provided on the top surface of the annular flange, a third sealing member is provided in the first annular groove, and the third sealing member is used to achieve a sealed connection between the annular flange and the liquid cooling plate.

[0016] Further, preferably, a second annular groove is provided on the bottom surface of the annular flange, and the second sealing member is provided in the second annular groove.

[0017] On the basis of the above technical solution, preferably, the outer peripheral wall of the upper end of the hollow rod body is provided with an external thread, and the lower end of the inner wall of the upper sleeve is provided with an internal thread connected to the external thread. The outer peripheral wall of the upper end of the hollow rod body is also fixed with at least one fourth seal along its axial direction. The fourth seal is located above the external thread, and the fourth seal is used to establish a sealed connection between the outer wall of the lower sleeve and the inner wall of the upper sleeve.

[0018] Furthermore, preferably, the outer peripheral wall of the upper end of the hollow rod body is also provided with a limiting step, and the limiting step is located below the external thread and is used to conflict with the bottom end surface of the upper sleeve.

[0019] On the basis of the above technical solution, preferably, the upper nut includes a screw column fixedly arranged on the bottom surface of the nut body, the diameter of the screw column is smaller than the diameter of the nut body, the through hole is arranged at the central axis of the nut body and the screw column, the bottom surface of the nut body is used to contact the top surface of the box cover, and the screw column is threadedly connected to the upper inner wall of the upper sleeve.

[0020] Further, preferably, an annular protrusion is provided on the top surface of the upper nut, and the first sealing member surrounds the outside of the annular protrusion.

[0021] Preferably, a plurality of cutouts are evenly arranged on the outer peripheral surface of the upper nut.

[0022] In the second aspect, the utility model provides a battery pack, comprising a box body, a battery module, a box cover and the battery hook connection assembly described in the first aspect, the box body comprising a frame, a crossbeam fixedly arranged inside the frame and a bottom plate fixedly arranged at the bottom of the frame, a liquid cooling plate is also arranged between the bottom plate and the crossbeam, the battery module is arranged in the box body, the box cover is fixedly arranged at the top of the frame, the upper sleeve is arranged between the box cover and the crossbeam, the upper end of the hollow rod body is used to pass through the bottom plate, the liquid cooling plate and the crossbeam and be threadedly connected to the inner wall of the lower end of the upper sleeve, the annular flange is located between the bottom plate and the liquid cooling plate, the threaded sleeve passes through the bottom plate and is threadedly connected to the lower nut, the upper nut is arranged on the top surface of the box cover, and passes through the box cover and is threadedly fixed to the upper sleeve.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The upper and lower sleeves are connected by threads, replacing the one-piece design, reducing the length of the parts and the overall processing difficulty, while reducing production costs; the segmented design also facilitates the assembly and maintenance of components, improving production efficiency; the segmented component design makes installation and maintenance more convenient, especially when certain parts need to be replaced or repaired, only the corresponding nuts and sleeves need to be removed, greatly improving the convenience and efficiency of operation; at the same time, seals are set between the upper sleeve and the upper nut, and between the lower sleeve and the lower nut to ensure the sealing of these connections, prevent external impurities, moisture, etc. from entering the battery pack, thereby reducing the risk of battery leakage and short circuit, and extending the battery life.

[0025] (2) By setting an annular flange at the bottom end of the hollow rod body and making the two sides of the annular flange contact the liquid cooling plate and the bottom plate respectively, and at the same time setting sealing members on both sides of the annular flange respectively, double sealing protection can be achieved between the liquid cooling plate, the bottom plate and the lower sleeve, thereby improving the sealing reliability of the battery pack.

[0026] (3) By setting the fourth seal, the connection between the upper sleeve and the lower sleeve is sealed, which can prevent external moisture from entering the battery pack through the connection between the upper sleeve and the lower sleeve, thereby improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1This is a schematic diagram of the three-dimensional structure of the battery hanging ear connection assembly disclosed in the present utility model;

[0029] Figure 2 This is a first-perspective exploded schematic diagram of the battery mounting ear connection assembly disclosed in the present utility model;

[0030] Figure 3 This is a schematic exploded view from a second perspective of the battery mounting ear connection assembly disclosed in the present utility model;

[0031] Figure 4 This is a schematic diagram of the three-dimensional structure of the battery pack disclosed in the present utility model;

[0032] Figure 5 This is a schematic diagram of the internal structure of the battery pack disclosed in the present utility model;

[0033] Figure 6 This is a schematic diagram of the assembly structure of the battery pack and battery mounting ear connection assembly disclosed in the present utility model;

[0034] Figure 7 A top view of the battery pack disclosed in the present utility model;

[0035] Figure 8 for Figure 7 Plane section view at AA in the middle;

[0036] Figure 9 for Figure 8 A partial enlarged view of point B in the middle;

[0037] Reference numerals:

[0038] 1. Battery hanger connection assembly; 11. Upper sleeve; 12. Upper nut; 13. First seal; 14. Lower sleeve; 15. Lower nut; 16. Second seal; 120. Through hole; 141. Hollow rod; 142. Annular flange; 143. Screw sleeve; 1421. First annular groove; 17. Third seal; 1422. Second annular groove; 1411. External thread; 18. Fourth seal; 1412. Limiting step; 121. Nut body; 122. Screw column; 111. Annular protrusion; 112. Notch; 2. Box body; 3. Box cover; 21. Frame; 22. Crossbeam; 23. Bottom plate; 4. Liquid cooling plate. DETAILED DESCRIPTION

[0039] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] like Figure 1 As shown, combined Figure 2-3 The embodiment of the utility model discloses a battery hanging ear connection assembly, including an upper sleeve 11, an upper nut 12, a first sealing member 13, a lower sleeve 14, a lower nut 15 and a second sealing member 16.

[0041] Among them, when the upper sleeve 11 is actually in use, its top surface is used to contact the bottom surface of the box cover 3, and its bottom surface is used to contact the top surface of the crossbeam 22. When the battery hanger connection assembly 1 of this embodiment is in use, the upper sleeve 11 is arranged between the cover plate and the crossbeam 22 to realize the connection between the battery pack box cover 3 and the crossbeam 22, providing support for the rigidity and stability of the entire battery pack.

[0042] The upper nut 12 is arranged on the top surface of the box cover 3 and passes through the box cover 3 to be threadedly connected to the upper end of the upper sleeve 11. A through hole 120 is opened at the center axis of the upper nut 12. The purpose of the through hole 120 is to allow the bolt to pass through the upper sleeve 11 and the lower sleeve 14 from the through hole 120 of the upper nut 12 to fix the battery pack on the vehicle chassis.

[0043] The first seal 13 is located between the top surface of the upper sleeve 11 and the upper nut 12, and is used to achieve sealing at the connection between the upper sleeve 11, the upper nut 12 and the box cover 3. Through the setting of the first seal 13, a seal is provided between the battery hook connection assembly 1 and the box cover 3 to prevent external moisture and impurities from entering the battery pack through the connection between the battery hook connection assembly 1 and the box cover 3, thereby ensuring the safety of the battery pack.

[0044] The lower sleeve 14 has an upper end that is adapted to pass through the bottom plate 23 and the crossbeam 22 and be threadedly connected to the inner wall of the lower end of the upper sleeve 11, while its lower end is adapted to contact the inner side of the bottom plate 23. The lower nut 15 is adapted to be disposed on the outer side of the bottom plate 23 and be threadedly connected to the lower sleeve 14. With this arrangement, the lower sleeve 14 passes through the bottom plate 23 and the crossbeam 22 to connect to the upper sleeve 11, and the lower nut 15 is threadedly connected to the lower sleeve 14, thereby firmly fixing the lower sleeve 14 to the bottom plate 23 and the upper sleeve 11. Simultaneously, the upper nut 12 passes through the box cover 3 and is threadedly connected to the upper sleeve 11, thereby effectively connecting the box cover 3, the crossbeam 22, and the bottom plate 23 of the battery pack together, thereby improving the structural rigidity and stability of the entire battery pack.

[0045] The second seal 16 is located between the lower sleeve 14 and the lower nut 15 and is used to seal the connection between the lower sleeve 14, the lower nut 15, and the bottom plate 23. The second seal 16 prevents external moisture and impurities from entering the battery pack through the connection between the battery mounting bracket connector 1 and the bottom plate 23, ensuring the safety of the battery pack.

[0046] At the same time, seals are provided between the upper sleeve 11 and the upper nut 12, and between the lower sleeve 14 and the lower nut 15 to ensure the sealing of these connections and prevent external impurities, moisture, etc. from entering the battery pack, thereby reducing the risk of battery leakage and short circuit and extending the battery life.

[0047] The upper and lower sleeves 14 are connected by threads, replacing a single-piece design. This reduces component length, overall machining complexity, and production costs. The segmented design also facilitates assembly and maintenance, improving production efficiency. The segmented assembly design makes installation and maintenance even more convenient. When replacing or repairing a component, simply remove the corresponding nut and sleeve, significantly improving ease and efficiency.

[0048] In order to achieve a fixed connection between the lower sleeve 14 and the upper sleeve 11 and the bottom plate 23 , this embodiment shows a preferred structural mode of the lower sleeve 14 . Specifically, the lower sleeve 14 includes a hollow rod body 141 , an annular flange 142 and a threaded sleeve 143 .

[0049] An annular flange 142 is fixedly mounted on the bottom end of the hollow rod 141. A threaded sleeve 143 extends axially from the bottom end of the hollow rod 141. The upper end of the hollow rod 141 is threadedly connected to the inner wall of the lower end of the upper sleeve 11, ensuring a secure connection between the upper and lower sleeves 14. The bottom plate 23 is positioned outside the annular flange 142. The annular flange 142 adds a contact surface at the bottom end of the hollow rod 141, which improves the connection strength between the bottom plate 23 and the lower sleeve 14 and increases the sealing contact area. The threaded sleeve 143 passes through the bottom plate 23 and extends to the outside of the bottom plate 23. The lower nut 15 is threadedly connected to the threaded sleeve 143. A second sealing member 16 is located between the annular flange 142 and the lower nut 15, ensuring a sealed connection between the lower sleeve 14 and the bottom plate 23, preventing external impurities and moisture from entering the battery pack and improving the safety and service life of the battery pack.

[0050] Typically, a liquid cooling plate 4 is also provided inside the battery pack. The liquid cooling plate 4 is located on the top surface of the bottom plate 23. When the battery hook connection assembly 1 is assembled with the battery pack, it needs to pass through the liquid cooling plate 4. Specifically, the lower sleeve 14 passes through the bottom plate 23 and the liquid cooling plate 4 in turn, and then the lower sleeve 14 exists at the two connections between the bottom plate 23 and the liquid cooling plate 4.

[0051] When the seal between the bottom plate 23 and the lower sleeve 14 fails, external moisture can easily break through the seal and enter the battery pack. In some preferred embodiments, the top surface of the annular flange 142 is provided with a first annular groove 1421, and a third sealing member 17 is disposed in the first annular groove 1421. The third sealing member 17 is used to seal the connection between the annular flange 142 and the liquid cooling plate 4.

[0052] With this structural arrangement, when the battery hanger connection assembly 1 is assembled with the battery pack box 2, the liquid cooling plate 4 is first installed inside the box 2, and then the hollow rod 141 of the lower sleeve 14 passes through the liquid cooling plate 4 and the cross beam 22 and is threadedly fixed with the upper sleeve 11. At this time, the top surface of the annular flange 142 at the end of the hollow rod 141 abuts against the bottom surface of the liquid cooling plate 4, and the third sealing member 17 on the top surface of the annular flange 142 can achieve sealing at the connection between the lower sleeve 14 and the liquid cooling plate 4. After the lower sleeve 14 is fixedly assembled with the liquid cooling plate 4, the crossbeam 22 and the upper sleeve 11, the bottom plate 23 is placed on the bottom surface of the box body 2, and the threaded sleeve 143 is passed through the bottom plate 23. The lower nut 15 is locked with the threaded sleeve 143 to achieve the fixed installation of the bottom plate 23 on the bottom surface of the box body 2. At the same time, the second sealing member 16 on the bottom surface of the annular flange 142 is tightly fitted with the inner top surface of the bottom plate 23, which can achieve reliable sealing at the connection between the bottom plate 23 and the lower sleeve 14.

[0053] Preferably, a second annular groove 1422 is provided on the bottom surface of the annular flange 142, and the second seal 16 is provided in the second annular groove 1422. By setting the first annular groove 1421 and the second annular groove 1422, and staggering the first annular groove 1421 and the second annular groove 1422, the seals can be staggered on the upper and lower surfaces of the annular flange 142 to achieve sealing at the connection between the base plate 23, the liquid cooling plate 4 and the lower sleeve 14.

[0054] When the battery pack is in use, if the seal at the connection between the bottom plate 23 and the lower sleeve 14 fails, the sealing structure between the liquid cooling plate 4 and the lower sleeve 14 can still provide sealing protection, thereby improving the sealing reliability of the battery pack.

[0055] It should be noted that after the overall assembly of the box body 2, liquid cooling plate 4, bottom plate 23, upper sleeve 11 and lower sleeve 14 is completed, the battery pack is packed, and finally the box cover 3 is installed on the top surface of the box body 2, and the upper nut 12 is threadedly fixed to the upper sleeve 11 to complete the installation and use of the battery hanger connection assembly 1 in the battery pack. The entire installation process is not complicated, which improves the overall stiffness of the battery pack after the battery hanger connection assembly 1 is installed, and also realizes the sealing of each position of the connection between the battery hanger connection assembly 1 and the box body 2 and the box cover 3, thereby improving the safety and reliability of the battery pack.

[0056] In this embodiment, an external thread 1411 is provided on the outer peripheral wall of the upper end of the hollow rod body 141, and an internal thread connected to the external thread 1411 is provided on the lower end of the inner wall of the upper sleeve 11. Thus, after the upper sleeve 11 passes through the beam 22, the upper end of the hollow rod body 141 can be inserted into the inner wall of the upper sleeve 11 by screwing to achieve a threaded connection.

[0057] At least one fourth seal 18 is also fixedly mounted along the axial direction of the outer peripheral wall of the upper end of the hollow rod body 141. This fourth seal 18 is located above the external thread 1411 and is used to establish a sealed connection between the outer wall of the lower sleeve 14 and the inner wall of the upper sleeve 11. This arrangement, through the provision of the fourth seal 18, seals the connection between the upper and lower sleeves 11, 14, preventing external moisture from entering the battery pack through the connection between the upper and lower sleeves 11, 14, thereby improving battery pack safety.

[0058] Preferably, the outer peripheral wall of the upper end of the hollow rod body 141 is further provided with a limiting step 1412, which is located below the external thread 1411 and is used to interfere with the bottom end surface of the upper sleeve 11. The setting of the limiting step 1412 can prevent the lower sleeve 14 from being deformed by excessive torque.

[0059] To achieve a secure connection between the upper nut 12 and the upper sleeve 11, this embodiment illustrates a preferred structural configuration for the upper nut 12. Specifically, the upper nut 12 comprises a nut body 121 fixedly mounted on the bottom surface of the nut body 121, and a screw post 122. The diameter of the screw post 122 is smaller than that of the nut body 121. A through-hole 120 is provided at the central axis of the nut body 121 and the screw post 122, ensuring that the bolt passes through the entire mounting bracket assembly to securely connect the battery pack to the vehicle chassis. The bottom surface of the nut body 121 is intended to contact the top surface of the case cover 3, and the screw post 122 is threadedly connected to the upper inner wall of the upper sleeve 11.

[0060] The bottom surface of the nut body 121 contacts the top surface of the box cover 3, providing a stable support surface and increasing the reliability of the connection. Since the diameter of the screw column 122 is smaller than that of the nut body 121, the nut body 121 can have a larger connection contact area with the box cover 3, thereby improving the connection strength.

[0061] Preferably, an annular protrusion 111 is provided on the top surface of the upper sleeve 11, and the first seal 13 is surrounded by the outside of the annular protrusion 111. The setting of the annular protrusion 111 facilitates the fixing of the first seal 13 on the outside of the annular protrusion 111, thereby improving the structural stability of the first seal 13 after assembly.

[0062] Preferably, a plurality of cutouts 112 are evenly arranged on the outer peripheral surface of the upper nut 12 of this embodiment, thereby preventing the middle portion of the upper sleeve 11 from interfering with the crossbeam 22 and the battery module.

[0063] This embodiment also provides a battery pack, see the attached Figure 4-9As shown, it includes a box body 2, a battery module, a box cover 3 and the battery ear connection assembly 1 described in the above embodiment, the box body 2 includes a frame 21, a crossbeam 22 fixedly arranged inside the frame 21 and a bottom plate 23 fixedly arranged at the bottom of the frame 21, and a liquid cooling plate 4 is also arranged between the bottom plate 23 and the crossbeam 22. The battery module is arranged in the box body 2, the box cover 3 is fixedly arranged at the top of the frame 21, and the upper sleeve 11 is arranged between the box cover 3 and the crossbeam 22. The upper end of the hollow rod body 141 is used to pass through the bottom plate 23, the liquid cooling plate 4 and the crossbeam 22 and is threadedly connected to the inner wall of the lower end of the upper sleeve. The annular flange 142 is located between the bottom plate 23 and the liquid cooling plate 4. The threaded sleeve 143 passes through the bottom plate 23 and is threadedly connected to the lower nut 15. The upper nut 12 is arranged on the top surface of the box cover 3 and passes through the box cover 3 and is threadedly fixed to the upper sleeve 11.

[0064] The following describes the installation process of the battery mounting bracket connector assembly 1 in the battery pack:

[0065] First, install the liquid cooling plate 4 inside the housing 2. Then, pass the hollow rod 141 of the lower sleeve 14 through the liquid cooling plate 4 and the crossbeam 22 and securely connect it to the upper sleeve 11 by means of threads. At this point, the top surface of the annular flange 142 at the end of the hollow rod 141 abuts against the bottom surface of the liquid cooling plate 4. The third sealing member 17 on the top surface of the annular flange 142 seals the connection between the lower sleeve 14 and the liquid cooling plate 4. After the lower sleeve 14 is securely assembled with the liquid cooling plate 4, the crossbeam 22, and the upper sleeve 11, place the bottom plate 23 on the bottom surface of the housing 2. Pass the threaded sleeve 143 through the bottom plate 23 and tighten it with the lower nut 15 to secure the bottom plate 23 to the bottom surface of the housing 2. At the same time, the second sealing member 16 on the bottom surface of the annular flange 142 fits tightly against the inner top surface of the bottom plate 23, ensuring a reliable seal at the connection between the bottom plate 23 and the lower sleeve 14.

[0066] After the overall assembly of the box body 2, liquid cooling plate 4, bottom plate 23, upper sleeve 11 and lower sleeve 14 is completed, the battery pack is packed, and finally the box cover 3 is installed on the top surface of the box body 2, and the upper nut 12 is threadedly fixed to the upper sleeve 11 to complete the installation of the battery ear connection assembly 1 in the battery pack.

[0067] This embodiment uses the battery hanger assembly on the battery pack, thereby improving the overall stiffness of the battery pack after the battery hanger connection assembly 1 is installed, and also achieving the sealing of various positions at the connection between the battery hanger connection assembly 1 and the box body 2 and the box cover 3, thereby improving the safety and reliability of the battery pack.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery hanging ear connection assembly (1), characterized in that: include: An upper sleeve (11) is used to be arranged between the crossbeam (22) and the box cover (3); An upper nut (12) is used to be arranged on the top surface of the box cover (3) and pass through the box cover (3) to be threadedly connected to the upper end of the upper sleeve (11), and a through hole (120) is opened at the central axis of the upper nut (12); A first sealing member (13) is located between the top surface of the upper sleeve (11) and the upper nut (12) and is used to achieve sealing at the connection between the upper sleeve (11), the upper nut (12) and the box cover (3); The lower sleeve (14) has an upper end for passing through the bottom plate (23) and the cross beam (22) and being threadedly connected to the inner wall of the lower end of the upper sleeve (11), and a lower end for contacting the inner side of the bottom plate (23); A lower nut (15) is arranged on the outside of the bottom plate (23) and is threadedly connected to the lower sleeve (14); The second sealing member (16) is located between the lower sleeve (14) and the lower nut (15) and is used to achieve sealing at the connection between the lower sleeve (14), the lower nut (15) and the bottom plate (23).

2. The battery hanging ear connection assembly (1) according to claim 1, characterized in that: The lower sleeve (14) comprises a hollow rod body (141), an annular flange (142) and a threaded sleeve (143); the annular flange (142) is fixedly arranged at the bottom end of the hollow rod body (141); the threaded sleeve (143) is formed by extending from the bottom end of the hollow rod body (141) in the axial direction; the upper end of the hollow rod body (141) is used to pass through the bottom plate (23) and the cross beam (22) and be threadedly connected to the inner wall of the lower end of the upper sleeve (11); the bottom plate (23) is arranged on the outside of the annular flange (142), and the threaded sleeve (143) passes through the bottom plate (23); the lower nut (15) is threadedly connected to the threaded sleeve (143); and the second sealing member (16) is located between the annular flange (142) and the lower nut (15).

3. The battery hanging ear connection assembly (1) according to claim 2, characterized in that: A first annular groove (1421) is provided on the top surface of the annular flange (142), a third sealing member (17) is provided in the first annular groove (1421), and the third sealing member (17) is used to achieve a sealed connection between the annular flange (142) and the liquid cooling plate (4).

4. The battery hanging ear connection assembly (1) according to claim 2, characterized in that: A second annular groove (1422) is provided on the bottom surface of the annular flange (142), and the second sealing member (16) is provided in the second annular groove (1422).

5. The battery hanging ear connection assembly (1) according to claim 2, characterized in that: The outer peripheral wall of the upper end of the hollow rod body (141) is provided with an external thread (1411), and the lower end of the inner wall of the upper sleeve (11) is provided with an internal thread connected to the external thread (1411). The outer peripheral wall of the upper end of the hollow rod body (141) is also fixedly provided with at least one fourth sealing member (18) along its axial direction. The fourth sealing member (18) is located above the external thread (1411). The fourth sealing member (18) is used to establish a sealed connection between the outer wall of the lower sleeve (14) and the inner wall of the upper sleeve (11).

6. The battery hanging ear connection assembly (1) according to claim 5, characterized in that: The outer peripheral wall of the upper end of the hollow rod body (141) is also provided with a limiting step (1412), and the limiting step (1412) is located below the external thread (1411) and is used to conflict with the bottom end surface of the upper sleeve (11).

7. The battery hanging ear connection assembly (1) according to claim 1, characterized in that: The upper nut (12) includes a nut body (121) and a screw column (122) fixedly arranged on the bottom surface of the nut body (121). The diameter of the screw column (122) is smaller than the diameter of the nut body (121). The through hole (120) is arranged at the central axis of the nut body (121) and the screw column (122). The bottom surface of the nut body (121) is used to contact the top surface of the box cover (3). The screw column (122) is threadedly connected to the upper inner wall of the upper sleeve (11).

8. The battery hanging ear connection assembly (1) according to claim 7, characterized in that: An annular protrusion (111) is provided on the top surface of the upper sleeve (11), and the first sealing member (13) surrounds the outside of the annular protrusion (111).

9. The battery hanging ear connection assembly (1) according to claim 1, characterized in that: The outer peripheral surface of the upper nut (12) is evenly provided with a plurality of cutouts (112).

10. A battery pack comprising a box body (2), a battery module, a box cover (3) and the battery hanging ear connection assembly (1) according to any one of claims 3 to 9, characterized in that: The box body (2) includes a frame (21), a crossbeam (22) fixedly arranged inside the frame (21), and a bottom plate (23) fixedly arranged at the bottom of the frame (21); a liquid cooling plate (4) is further arranged between the bottom plate (23) and the crossbeam (22); the battery module is arranged in the box body (2); the box cover (3) is fixedly arranged on the top of the frame (21); and the upper sleeve (11) is arranged between the box cover (3) and the crossbeam (22). The upper end of the hollow rod body (141) is used to pass through the bottom plate (23), the liquid cooling plate (4) and the crossbeam (22) and is threadedly connected to the inner wall of the lower end of the upper sleeve. The annular flange (142) is located between the bottom plate (23) and the liquid cooling plate (4). The threaded sleeve (143) passes through the bottom plate (23) and is threadedly connected to the lower nut (15). The upper nut (12) is arranged on the top surface of the box cover (3) and passes through the box cover (3) to be threadedly fixedly connected to the upper sleeve (11).

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