Sealing connection structure and battery pack

Abstract

The utility model provides a sealing connection structure and a battery pack, the sealing connection structure is connected between an upper shell and a lower shell of the battery pack, the sealing connection structure comprises a sealing cover plate, the bottom of the sealing cover plate is provided with an extension part penetrating through the upper shell, and the sealing cover plate is provided with a sealing groove; a through hole penetrating through the extending part in the height direction is formed in the sealing cover plate; the supporting rod is provided with a supporting end abutting against the upper shell, the bottom end of the supporting rod is connected with the lower shell, and a containing cavity for containing the extending part is formed in the supporting end; the sealing structure is arranged between the extension part and the accommodating cavity; the connecting end of the connecting piece is connected with the supporting rod through the through hole so that the sealing cover plate and the supporting rod can be tightly pressed on the upper side and the lower side of the upper shell. Therefore, liquid outside the battery pack is prevented from entering the battery pack along the connecting piece, and the sealing performance of the battery pack is improved while the connecting effect of the upper shell and the lower shell is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and particularly relates to a sealed connection structure. The utility model also relates to a battery pack provided with the above-mentioned sealed connection structure. Background Art

[0002] Currently, electric vehicles are the mainstream of new energy vehicles. With the increase in consumers' usage scenarios, consumers' requirements for the cruising range of electric vehicles are getting higher and higher, which makes the capacity of vehicle battery packs larger and the volume of battery packs larger.

[0003] Due to the increase in the size of the battery pack, between the upper shell and the lower shell of the battery pack, in addition to connection positions being provided around the battery pack, a connection structure is also provided between the upper shell and the lower shell in the middle part of the battery pack to prevent the deformation of the battery pack shell and improve the structural strength of the battery pack.

[0004] Currently, in order to connect the upper shell and the lower shell, a bolt penetrating through the upper shell and the lower shell is usually provided in the battery pack to connect the upper and lower shells. However, due to the setting of the bolt penetrating the shell, when the vehicle wades through water, liquid will enter the gap between the bolt head and the shell due to water pressure and the impact pressure during driving and flow to the mounting hole of the shell. At this time, due to the capillary action at the threaded connection, the liquid is likely to seep into the battery pack, resulting in the damage of the battery pack.

[0005] In order to prevent the above situation from occurring, a sealing ring or a gasket is usually provided between the bolt head and the shell to improve the sealing effect of the battery pack shell. However, the sealing ring is in direct contact with the bolt head. During the installation process of the bolt, the bolt head rotates and squeezes the sealing ring, which will cause wear and damage to the contact surface between the sealing ring and the bolt head, or cause the sealing ring to be damaged due to excessive extrusion, thus making it difficult to ensure the sealing performance of the battery pack. Summary of the Utility Model

[0006] In view of this, the purpose of the present utility model is to propose a sealed connection structure to improve the sealing performance of the battery pack while ensuring the connection effect between the upper shell and the lower shell.

[0007] To achieve the above object, the technical solution of the present utility model is realized as follows:

[0008] A sealing connection structure is connected between the upper shell and the lower shell of a battery pack, and includes: a sealing cover plate, an extension part penetrating the upper shell is provided at the bottom of the sealing cover plate, and a through hole penetrating the extension part in the height direction is provided on the sealing cover plate; a support rod, the support rod has a support end abutting against the upper shell, and the bottom end of the support rod is connected to the lower shell, and a receiving cavity for receiving the extension part is formed on the support end; a sealing structure is arranged between the extension part and the receiving cavity; a connecting piece, the connecting end of the connecting piece is connected to the support rod through the through hole to tightly press the sealing cover plate and the support rod on the upper and lower sides of the upper shell.

[0009] Further, the connecting piece is a bolt.

[0010] Further, a sealing ring is provided between at least one of the sealing cover plate and the support end and the upper shell.

[0011] Further, the sealing structure is an O-ring, and part of the O-ring is embedded on the outer peripheral surface of the extension part.

[0012] Further, the bottom end of the support rod is connected to the cross beam of the lower shell.

[0013] Further, a threaded section is provided at the bottom end of the support rod, and the support rod is screwed to the top of the cross beam through the threaded section.

[0014] Further, a rivet nut is fixedly penetrated through the top of the cross beam, and the threaded section can be screwed into the rivet nut.

[0015] Further, the diameter of the threaded section is smaller than the diameter of the support rod, and an abutting surface is formed between the threaded section and the support rod; when the threaded section is screwed into the rivet nut, the abutting surface abuts against the top of the rivet nut.

[0016] Further, the bottom end of the support rod is welded to the top of the cross beam.

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

[0018] In the sealing connection structure of the present utility model, through the arrangement of the extension part and the sealing structure, the sealing structure seals the gap between the extension part and the receiving cavity, preventing the liquid outside the battery pack from entering the battery pack along the connecting piece, and improving the sealing performance of the battery pack while ensuring the connection effect between the upper shell and the lower shell.

[0019] The connecting piece adopts a bolt, which can achieve a detachable setting, so as to facilitate the disassembly and assembly of the sealing cover plate for replacing the sealing structure, which is beneficial to the maintenance of this sealing connection structure.

[0020] By providing sealing rings between the sealed cover plate and the upper housing, and between the support end and the upper housing, the gaps between the upper housing, the sealed cover plate and the support end can be sealed, preventing external liquid of the battery pack from entering the battery pack, thereby improving the sealing performance of the battery pack.

[0021] The sealing structure is an O-ring, which can be embedded and held on the extension part, enabling the O-ring to move along with the extension part, facilitating the installation and replacement of the sealing structure, and thus facilitating the maintenance of this sealed connection structure by operators.

[0022] The cross beam, as a strengthening component of the lower housing, has good structural strength. Connecting and fixing the bottom end of the support rod to the cross beam has a good connection effect. At the same time, the cross beam can effectively support the support rod and the upper housing.

[0023] The support rod is screwed to the cross beam through a threaded section, which facilitates the installation of the support rod and realizes the detachable connection of the support rod. Moreover, a blind rivet nut is provided at the top of the cross beam. The blind rivet nut has a long thread, which can improve the connection strength between the blind rivet nut and the threaded section, thus having a good connection effect and improving the connection stability between the cross beam and the support rod.

[0024] There is a contact surface between the support rod and the threaded section for abutting against the top of the blind rivet nut, which can support the support rod to prevent it from shaking, thereby improving the stability of the support rod. In addition, the support rod can also be connected to the cross beam by welding to ensure the connection strength between the cross beam and the support rod.

[0025] Another object of the present utility model is to provide a battery pack, in which the above-mentioned sealed connection structure is provided.

[0026] The battery pack and / or the sealed connection structure of the present utility model have the same connection effect as the prior art, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0028] Figure 1 is a schematic diagram of the overall structure of the sealed connection structure according to Embodiment 1 of the present utility model;

[0029] Figure 2 is a schematic diagram of another embodiment of the sealed connection structure according to Embodiment 1 of the present utility model;

[0030] Description of the reference numerals:

[0031] 1. Upper housing

[0032] 2. Sealing cover plate; 201. Extension part; 202. Sealing structure

[0033] 3. Support rod; 301. Support end; 302. Accommodating cavity; 303. Threaded section

[0034] 4. Connecting piece

[0035] 5. Sealing ring

[0036] 6. Cross beam; 601. Rivet nut Detailed implementation manners

[0037] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other

[0038] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application

[0039] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be construed as indicating or implying relative importance

[0040] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connecting piece" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations

[0041] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments

[0042] Embodiment 1

[0043] This embodiment relates to a sealed connection structure, which is connected between the upper housing 1 and the lower housing of the battery pack. In terms of the overall structure, as Figure 1 shown, the sealed connection structure of this embodiment includes: a sealing cover plate 2, a support rod 3, a sealing structure 202, and a connecting member 4.

[0044] Among them, the bottom of the sealing cover plate 2 is provided with an extension portion 201 penetrating through the upper housing 1, and the sealing cover plate 2 is provided with a through hole penetrating through the extension portion 201 in the height direction. The support rod 3 has a support end 301 abutting against the upper housing 1, and the bottom end of the support rod 3 is connected to the lower housing. An accommodation cavity 302 for accommodating the extension portion 201 is formed on the support end 301. The sealing structure 202 is arranged between the extension portion 201 and the accommodation cavity 302. The connecting end of the connecting member 4 is connected to the support rod 3 via the through hole, so as to tightly press the sealing cover plate 2 and the support rod 3 on the upper and lower sides of the upper housing 1.

[0045] It can be understood that the sealing cover plate 2 and the support end 301 are tightly pressed on both sides of the upper housing 1 due to the fastening of the connecting member 4, and it is difficult for the liquid outside the battery pack to enter the battery pack through the gap between the sealing cover plate 2 and the support end 301 and the upper housing 1. In addition, during the installation of the connecting member 4, no matter what kind of connecting member 4 is used, there will be no relative rotation between the extension portion 201 of the sealing cover plate 1 and the accommodation cavity 301. Therefore, the sealing structure 202 between the extension portion 201 and the accommodation cavity 301 will not be damaged due to the installation of the connecting member 4. Even if the external liquid enters the accommodation cavity 301 along the connecting member 4, it is difficult for the liquid to enter the battery pack through the sealing structure 202.

[0046] As described above, through the arrangement of the extension portion 201 and the sealing structure 202, the sealing structure 202 blocks the gap between the extension portion 201 and the accommodation cavity 302, preventing the liquid outside the battery pack from entering the battery pack along the connecting member 4, and improving the sealing performance of the battery pack while ensuring the connection effect between the upper housing 1 and the lower housing.

[0047] Based on the above overall introduction, specifically, in order to facilitate the maintenance of the sealed connection structure of this embodiment, the connecting member 4 of this embodiment is a bolt, which can realize the detachable setting of the connecting member 4, facilitate the disassembly and assembly of the sealing cover plate 2 to replace the sealing structure 202, and thus facilitate the maintenance of this sealed connection structure. Of course, the connecting member 4 of this embodiment can also adopt other conventional connecting members 4 such as rivets, as long as the connection effect between the sealing cover plate 2 and the support rod 3 can be ensured.

[0048] In this embodiment, the upper and lower ends of the upper housing 1 are in close contact with the sealing cover plate 2 and the support end 301. However, there will still be small gaps between the upper housing 1 and the sealing cover plate 2 and the support end 301. Due to capillary action, the liquid outside the battery pack is likely to enter the battery pack successively through the gaps between the upper housing 1 and the sealing cover plate 2 and between the upper housing 1 and the support end 301. In order to further improve the sealing performance of the upper housing 1, a sealing ring 5 is provided between at least one of the sealing cover plate 2 and the support end 301 and the upper housing 1 in this embodiment. By providing the sealing ring 5, the gaps between the upper housing 1 and the sealing cover plate 2 and the support end 301 can be blocked, preventing the liquid outside the battery pack from entering the battery pack through this place, thereby further improving the sealing performance of the upper housing 1, that is, the battery pack.

[0049] In specific implementation, if a sealing ring 5 is provided on the support end 301, the sealing ring 5 is provided at the bottom of the upper housing 1, that is, inside the battery pack. To maintain and replace the sealing ring 5, the entire upper housing 1 needs to be disassembled. Therefore, in this embodiment, the sealing ring 5 can be provided only on the sealing cover plate 2. When replacing and maintaining the sealing ring 5, only the sealing cover plate 2 needs to be removed, which facilitates the maintenance operation of the operator.

[0050] In order to facilitate the installation and replacement of the sealing structure 202, the sealing structure 202 in this embodiment is an O-ring, and a part of the O-ring is embedded on the outer peripheral surface of the extension part 201. By providing the O-ring, the O-ring can be held on the extension part 201 of the sealing cover plate 2. When assembling the sealing cover plate 2, the O-ring enters the accommodation cavity 302 as the extension part 201 moves and is held between the accommodation cavity 302 and the extension part 201. When disassembling the sealing cover plate 2, the O-ring is taken out as the extension part 201 moves, which is beneficial to the installation and replacement of the sealing structure 202, thereby facilitating the maintenance of this sealing connection structure by the operator. In addition, in specific implementation, the sealing structure 202 can adopt a sealing ring 5 with other cross-sectional shapes, or the sealing structure 202 can also adopt other sealing structures 202 well-known to those skilled in the art, such as conventional sealing structures 202 like sealing bushings, sealants, and sealing foams, as long as the gaps between the accommodation cavity 302 and the extension part 201 can be blocked.

[0051] Since the thickness of the lower shell is relatively thin and the rigidity of the lower shell is limited. If the bottom end of the support rod 3 is directly connected to the lower shell, when the battery pack moves with the vehicle, it is easy to cause the support rod 3 to vibrate inside the battery pack, thereby driving the lower shell and the upper shell 1 to vibrate, which is easy to cause the lower shell to deform, and at the same time, the connection effect between the lower shell and the support rod 3 is reduced. Therefore, in order to improve the connection effect between the support rod 3 and the lower shell, the bottom end of the support rod 3 of this embodiment is connected to the cross beam 6 of the lower shell. The cross beam 6, as a reinforcing component of the lower shell, has good structural strength. The support rod 3 is connected and fixed to the cross beam 6, which has a good connection effect. At the same time, the cross beam 6 can form an effective support for the support rod 3 and the upper shell 1.

[0052] In order to facilitate the installation of the support rod 3 and facilitate the maintenance of the support rod 3, the bottom end of the support rod 3 of this embodiment is provided with a threaded section 303, and the support rod 3 is screwed to the top of the cross beam 6 through the threaded section 303. By providing the threaded section 303, the support rod 3 is detachably screwed to the cross beam 6, which can facilitate the installation of the support rod 3, realize the detachable connection of the support rod 3, and facilitate the maintenance of the support rod 3 by the operator.

[0053] Specifically, since the top of the cross beam 6 is relatively thin, a threaded hole is provided between the tops of the cross beam 6, which will make the threads there shorter, resulting in a poor threaded connection effect between the cross beam 6 and the support rod 3. Therefore, a rivet nut 601 is fixed through the top of the cross beam 6 of this embodiment, and the threaded section 303 can be screwed into the rivet nut 601. The rivet nut 601 has a relatively long thread, which can improve the connection strength between the rivet nut 601 and the threaded section 303. At the same time, the rivet nut 601 is fixed to the top of the cross beam 6 by riveting, which has a better connection effect, thereby improving the connection stability between the cross beam 6 and the support rod 3.

[0054] In order to further improve the stability of the support rod 3, the diameter of the threaded section 303 of this embodiment is smaller than the diameter of the support rod 3, and an abutment surface is formed between the threaded section 303 and the support rod 3. When the threaded section 303 is screwed into the rivet nut 601, the abutment surface abuts against the top of the rivet nut 601. Through the setting of the abutment surface, when the threaded section 303 is screwed into place, the top of the rivet bolt abuts against the abutment surface, so that the crossbeam 6 can support the support rod 3 through the cooperation of the abutment surface and the rivet nut 601, thereby improving the stability of the support rod 3 and preventing the support rod 3 from shaking in the horizontal direction.

[0055] As a specific implementation form, Figure 2As shown in the figure, the bottom end of the support rod 3 of this embodiment can be connected to the top of the cross beam 6 by welding. The connection by welding has a better connection effect compared with other connection methods such as screwing, which can ensure the connection strength between the cross beam 6 and the support rod 3, thereby improving the connection effect between the sealed connection structure of this embodiment and the upper shell 1 and the lower shell of the battery pack.

[0056] In summary, for the sealed connection structure of this embodiment, through the arrangement of the extension part 201 and the sealing structure 202, the sealing structure 202 seals the gap between the extension part 201 and the accommodating cavity 302, preventing the liquid outside the battery pack from entering the battery pack along the connecting piece 4. While ensuring the connection effect between the upper shell 1 and the lower shell, the sealing performance of the battery pack is improved.

[0057] Embodiment Two

[0058] This embodiment relates to a battery pack. In terms of the overall structure, a sealed connection structure as described in Embodiment One is provided in this battery pack.

[0059] For the battery pack of this embodiment, through the arrangement of the above-mentioned sealed connection structure, the connection effect between the upper shell 1 and the lower shell can be ensured, and at the same time, the sealing performance of the battery pack housing is improved, thereby enhancing the use quality of the battery pack.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sealed connection structure connected between the upper shell and the lower shell of a battery pack, characterized in that: include: A sealing cover plate, wherein the bottom of the sealing cover plate is provided with an extension portion penetrating the upper shell, and the sealing cover plate is provided with a through hole penetrating the extension portion in a height direction; A support rod, wherein the support rod has a support end abutting against the upper shell, and the bottom end of the support rod is connected to the lower shell, and an accommodating cavity for accommodating the extension portion is formed on the support end; A sealing structure, disposed between the extension portion and the accommodating cavity; A connecting piece, wherein the connecting end of the connecting piece is connected to the support rod via the through hole, so as to press the sealing cover plate and the support rod tightly against the upper and lower sides of the upper shell.

2. The sealing connection structure according to claim 1, characterized in that: The connecting piece is a bolt.

3. The sealing connection structure according to claim 1, characterized in that: A sealing ring is provided between at least one of the sealing cover plate and the supporting end and the upper shell.

4. The sealing connection structure according to claim 1, characterized in that: The sealing structure is an O-ring, and a portion of the O-ring is embedded in the outer circumferential surface of the extension portion.

5. The sealed connection structure according to any one of claims 1 to 4, characterized in that: The bottom end of the support rod is connected to the crossbeam of the lower shell.

6. The sealing connection structure according to claim 5, characterized in that: The bottom end of the support rod is provided with a threaded section, and the support rod is screwed to the top of the crossbeam through the threaded section.

7. The sealing connection structure according to claim 6, characterized in that: A rivet nut is fixed through the top of the crossbeam, and the threaded section can be screwed into the rivet nut.

8. The sealing connection structure according to claim 7, characterized in that: The diameter of the threaded section is smaller than the diameter of the support rod, and an abutment surface is formed between the threaded section and the support rod; When the threaded section is screwed into the rivet nut, the abutment surface abuts against the top of the rivet nut.

9. The sealing connection structure according to claim 5, characterized in that: The bottom end of the support rod is welded to the top of the crossbeam.

10. A battery pack, characterized in that: The battery pack is provided with the sealing connection structure according to any one of claims 1 to 9.

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