Sealing structure, battery pack and vehicle

Abstract

The utility model relates to the technical field of batteries, in particular to a sealing structure, a battery pack and a vehicle, the sealing structure comprises an edge sealing assembly, the edge sealing assembly comprises a first elastic sealing part, a rigid limiting part and a first connecting bolt, and the first elastic sealing part is arranged along the edge of a box body by at least one circle; the first connecting bolt sequentially penetrates through the bottom protection plate in the first direction to be in threaded connection with the box body, and the first elastic sealing part is pressed between the bottom protection plate and the box body. The rigid limiting part is arranged on the bottom protection plate and the box body, and the size of the rigid limiting part in the first direction is smaller than the size of the first elastic sealing part in the natural extension state. According to the sealing structure, the battery pack and the vehicle provided by the invention, the sealing interface is formed between the bottom protection plate and the box body, so that the effectiveness and the stability of the sealing interface between the bottom protection plate and the box body are ensured.

Description

Technical Field

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

[0002] As one of the important components of new energy vehicles, the power battery has increasingly higher requirements for its bottom impact resistance. Therefore, many existing designs use foam between the liquid cooling plate and the bottom protection plate to protect the bottom of the battery pack. At the same time, the foam placed between the liquid cooling plate and the bottom protection plate can effectively improve the heat preservation effect of the battery pack.

[0003] However, current underbody protection plates, typically made of sheet metal to ensure their protective strength, are difficult to seal against the battery pack housing (or liquid cooling plate). Furthermore, the current method of bolting the underbody plate to the battery pack housing (or liquid cooling plate) is unsuitable for sealing, as conventional bolts lack a sealing effect. This results in a failure to achieve a proper seal between the underbody plate and the battery pack housing (or liquid cooling plate). Consequently, after a vehicle has driven through water, a large amount of water containing impurities can seep into the space between the underbody plate and the battery pack housing (or liquid cooling plate), causing the foam to absorb water and shortening its lifespan, thus affecting the bottom protection and insulation performance of the battery pack. Utility Model Content

[0004] The purpose of this application is to provide a sealing structure, battery pack, and vehicle to address, to some extent, the inability to achieve a proper seal between the underbody protection plate and the battery pack housing (or liquid cooling plate) in existing technologies. This results in a large amount of water containing impurities entering the space between the underbody protection plate and the battery pack housing (or liquid cooling plate) after the vehicle has driven through water. This leads to a shortened lifespan of the foam after absorbing water, affecting the bottom protection and insulation performance of the battery pack.

[0005] According to a first aspect of this application, a sealing structure is provided, the battery pack including a housing and a bottom protective plate disposed facing each other along a first direction, the sealing structure being used to connect the housing and the bottom protective plate, the sealing structure including an edge sealing assembly, the edge sealing assembly including a first elastic sealing part, a rigid limiting part and a first connecting bolt, the first elastic sealing part being disposed at least around the edge of the housing;

[0006] The first connecting bolt passes through the bottom guard plate and is threaded to the box body along the first direction, and the first elastic sealing part is press-fitted between the bottom guard plate and the box body;

[0007] The rigid limiting part is disposed on the bottom guard plate and the box body, and the size of the rigid limiting part in the first direction is smaller than the size of the first elastic sealing part in its natural elongation state.

[0008] Preferably, the first elastic sealing part has a dimension of h in the first direction in its natural state, and the rigid limiting part has a dimension of 0.4h to 0.6h in the first direction.

[0009] Preferably, there are multiple first connecting bolts, and the multiple first connecting bolts are spaced apart along the edge of the housing.

[0010] Preferably, each of the first connecting bolts is fitted with the rigid limiting part.

[0011] Preferably, the battery pack further includes a liquid cooling plate disposed between the housing and the bottom protective plate, the first connecting bolt passing through the bottom protective plate and the liquid cooling plate in sequence, and the first connecting bolt being threadedly connected to the housing.

[0012] Preferably, it further includes a central sealing assembly for connecting the middle of the housing and the middle of the bottom protective plate;

[0013] The central sealing assembly includes a second elastic sealing part, a rigid gasket, and a second connecting bolt. The second connecting bolt passes through the second elastic sealing part and the bottom protective plate in sequence along the first direction, and the second connecting bolt is threadedly connected to the housing.

[0014] Both the rigid gasket and the second elastic sealing part are placed between the nut of the second connecting bolt and the bottom protective plate;

[0015] The rigid gasket and the second elastic sealing part are aligned with each other in the first direction, and in the first direction, the size of the rigid gasket is smaller than the size of the second elastic sealing part in its natural state.

[0016] Preferably, the bottom protective plate is provided with a countersunk hole, and the nut of the first connecting bolt or the second connecting bolt is embedded in the countersunk hole.

[0017] Preferably, the rigid washer is fitted onto the outside of the second connecting bolt.

[0018] Alternatively, the rigid gasket may be fitted onto the outside of the second elastic seal.

[0019] According to a second aspect of this application, a battery pack is provided, including the aforementioned housing, the aforementioned bottom protective plate, and the sealing structure described in any of the aforementioned technical solutions. Therefore, it has all the beneficial technical effects of the sealing structure, which will not be repeated here.

[0020] According to a third aspect of this application, a vehicle is provided, including the sealing structure and battery pack described in any of the above technical solutions, and thus possesses all the beneficial technical effects of the sealing structure and battery pack, which will not be repeated here.

[0021] Compared with the prior art, the beneficial effects of this application are as follows:

[0022] The sealing structure provided in this application, on the one hand, has a first elastic sealing part arranged at least around the edge of the housing, and is threadedly connected to the housing through the bottom guard plate in the first direction by a first connecting bolt, so that the first elastic sealing part is pressed between the bottom guard plate and the housing, thereby effectively sealing the gap between the bottom guard plate and the housing, thus forming a sealing interface between the bottom guard plate and the housing; on the other hand, a rigid limiting part with a size smaller than the size of the first elastic sealing part in the natural elongation state is provided between the bottom guard plate and the housing in the first direction, thereby limiting the compression of the first elastic sealing part, effectively preventing the first elastic sealing part from failing due to overpressure, and ensuring the effectiveness and stability of the sealing interface between the bottom guard plate and the housing.

[0023] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is an exploded structural diagram of the battery pack provided in an embodiment of this application;

[0026] Figure 2 This is a front view structural diagram of the battery pack provided in an embodiment of this application;

[0027] Figure 3 A cross-sectional view of the edge sealing assembly provided in an embodiment of this application;

[0028] Figure 4 This is a cross-sectional view of the central sealing assembly provided in an embodiment of this application.

[0029] Figure label:

[0030] 1-Box body; 111-First rivet nut; 112-Second rivet nut; 2-Bottom guard plate; 21-Outer guard plate; 22-Inner lining plate; 31-Edge sealing assembly; 311-First elastic sealing part; 312-First connecting bolt; 313-Rigid limiting part; 32-Middle sealing assembly; 321-Second elastic sealing part; 322-Second connecting bolt; 323-Rigid gasket; 4-Liquid cooling plate; 5-Insulation layer; F1-First direction. Detailed Implementation

[0031] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0032] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0033] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] The following reference Figures 1 to 4 This application describes a sealing structure, battery pack, and vehicle according to some embodiments.

[0037] See Figures 1 to 4As shown, an embodiment of the first aspect of this application provides a sealing structure. Specifically, the battery pack includes a housing 1 and a bottom protective plate 2 disposed opposite each other along a first direction F1, and the sealing structure is used to connect the housing 1 and the bottom protective plate 2. The sealing structure includes an edge sealing assembly 31, which includes a first elastic sealing part 311, a rigid limiting part 313, and a first connecting bolt 312. The first elastic sealing part 311 is disposed at least around the edge of the housing 1. The first connecting bolt 312 passes through the bottom protective plate 2 sequentially along the first direction F1 and is threadedly connected to the housing 1. The first elastic sealing part 311 is press-fitted between the bottom protective plate 2 and the housing 1. The rigid limiting part 313 is disposed between the bottom protective plate 2 and the housing 1, and the size of the rigid limiting part 313 in the first direction F1 is smaller than the size of the first elastic sealing part 311 in its naturally extended state.

[0038] According to the sealing structure provided by the above technical features, on the one hand, the first elastic sealing part 311 is arranged at least around the edge of the housing 1, and is threadedly connected to the housing 1 through the bottom guard plate 2 in sequence along the first direction F1 by the first connecting bolt 312, so that the first elastic sealing part 311 is pressed between the bottom guard plate 2 and the housing 1, thereby effectively sealing the gap between the bottom guard plate 2 and the housing 1, and thus forming a sealing interface between the bottom guard plate 2 and the housing 1; on the other hand, a rigid limiting part 313 with a size smaller than the size of the first elastic sealing part 311 in the natural elongation state is provided between the bottom guard plate 2 and the housing 1 in the first direction F1, thereby limiting the compression of the first elastic sealing part 311, effectively avoiding the failure of the first elastic sealing part 311 due to overpressure, and ensuring the effectiveness and stability of the sealing interface between the bottom guard plate 2 and the housing 1.

[0039] like Figure 1 , Figure 3 and Figure 4 As shown in the figure, F1 can be an example of the first direction F1 mentioned above.

[0040] Preferably, such as Figure 3 As shown, the dimension of the first elastic sealing part 311 in the first direction F1 in its natural state can be h, and the dimension of the rigid limiting part 313 in the first direction F1 can be 0.4h to 0.6h, to ensure that the first elastic sealing part 311 can achieve optimal sealing performance when pressed between the bottom guard plate 2 and the housing 1. It should be noted that... Figure 3 To clarify the dimensional relationship between the first elastic sealing part 311 and the rigid limiting part 313, the first elastic sealing part 311 shown in the figure is depicted as being in a naturally elongated state. In reality, however... Figure 3In the assembly drawing of the edge sealing assembly 31 shown, the first elastic sealing part 311 should be pressed between the housing 1 and the bottom guard plate 2, and its compressed dimension in the first direction F1 should be equal to the dimension of the rigid limiting part 313 in the first direction F1.

[0041] Preferably, the first elastic sealing part 311 may be a sealing strip (e.g., sealing rubber strip, sealing silicone strip or other sealing strip) provided along the edge of the housing 1.

[0042] Optionally, the edges of the housing 1 and / or the bottom guard plate 2 may be provided with an embedding groove, and the first elastic sealing part 311 may be disposed in the embedding groove to facilitate the limiting and fixing of the first elastic sealing part 311.

[0043] Optionally, such as Figure 3 As shown, the box 1 can be fitted with a first rivet nut 111 that cooperates with the first connecting bolt 312, so that the box 1 and the first connecting bolt 312 can be threadedly connected through the first rivet nut 111 and the first connecting bolt 312.

[0044] It should be noted that the threaded hole of the housing 1 connected to the first connecting bolt 312 is not limited to the way of embedding the first rivet nut 111 on the housing 1. As long as the housing 1 can be provided with an internal threaded hole that mates with the first connecting bolt 312, the internal threaded hole can also be formed by direct machining on the housing 1.

[0045] Preferably, such as Figure 2 As shown, there are multiple first connecting bolts 312, which are spaced apart along the edge of the housing 1 to ensure the stability and sealing of the bottom guard plate 2.

[0046] Preferably, such as Figure 3 As shown, each first connecting bolt 312 is fitted with a rigid limiting part 313. In this way, by directly fitting the rigid limiting part 313 onto the first connecting bolt 312, the limiting accuracy and sensitivity of the rigid limiting part 313 are effectively provided, and the over-tightening of the first connecting bolt 312 and the first rivet nut 111 is effectively avoided, which would cause the bottom guard plate 2 to dent at the location of the first connecting bolt 312.

[0047] Preferably, such as Figure 3 As shown, the rigid limiting part 313 can be a rigid sleeve so as to be fitted onto the first connecting bolt 312.

[0048] Optionally, such as Figure 3As shown, the rigid limiting part 313 can also be a plurality of rigid pads stacked along the first direction F1. In this way, the size of the rigid limiting part 313 in the first direction F1 can be adjusted by adjusting the number or thickness of the rigid pads. This effectively improves the adaptability and versatility of the rigid limiting part 313.

[0049] Preferably, such as Figure 3 As shown, the bottom protective plate 2 may be provided with a first countersunk hole, and the nut of the first connecting bolt 312 may be embedded in the first countersunk hole to ensure the flatness of the bottom protective plate 2.

[0050] Optionally, such as Figure 3 and Figure 4 As shown, the bottom protective plate 2 may include an outer protective plate 21 and an inner lining plate 22 facing each other along a first direction. The outer protective plate 21 and the inner lining plate 22 are fixedly connected by stiffeners, so that the double-layer plate profile structure formed by the outer protective plate 21 and the inner lining plate 22 can effectively improve the load-bearing strength of the bottom protective plate 2. When the bottom protective plate 2 is connected to the housing 1, the inner lining plate 22 is positioned closer to the housing 1 than the outer protective plate 21. The first countersunk hole may be provided between the outer protective plate 21 and the inner lining plate 22 to conceal the nut of the first connecting bolt 312.

[0051] In an embodiment, such as Figure 2 and Figure 4 As shown, the sealing structure may further include a central sealing component 32, which can be used to connect the middle part of the housing 1 and the middle part of the bottom protective plate 2, so as to further increase the connection points between the bottom protective plate 2 and the housing 1, thereby improving the connection stability between the bottom protective plate 2 and the housing 1 and preventing the bottom protective plate 2 from deforming in the middle under the influence of gravity.

[0052] It should be noted that, Figure 2 The dotted-line box shown divides the edge and the middle of the box 1. In other words, the part of the box 1 located inside the dotted-line box is connected to the bottom guard plate 2 by the middle sealing component 32, and the part of the box 1 located outside the dotted-line box is connected to the bottom guard plate 2 by the edge sealing component 31.

[0053] Preferably, such as Figure 4 As shown, the middle sealing assembly 32 may include a second elastic sealing part 321, a rigid gasket 323, and a second connecting bolt 322. The second connecting bolt 322 passes through the second elastic sealing part 321 and the bottom guard plate 2 in sequence along the first direction F1, and the second connecting bolt 322 is threadedly connected to the housing 1.

[0054] Preferably, such as Figure 4As shown, both the rigid gasket 323 and the second elastic sealing part 321 are placed between the nut of the second connecting bolt 322 and the bottom cover plate 2. The rigid gasket 323 and the second elastic sealing part 321 are aligned with each other in the first direction F1, and in the first direction F1, the size of the rigid gasket 323 is smaller than the size of the second elastic sealing part 321. Thus, not only does the second elastic sealing part 321 seal the hole through which the second connecting bolt 322 passes through the bottom cover plate 2, but the rigid gasket 323, aligned with the second elastic sealing part 321 in the first direction F1, is also placed between the nut of the second connecting bolt 322 and the bottom cover plate 2. The size of F1 is set to be smaller than the size of the second elastic sealing part 321 in its natural state. This allows the rigid gasket 323 to limit the maximum compression of the second elastic sealing part 321 without hindering its compression sealing. This ensures the uniformity of the tightening degree between the second connecting bolt 322 and the housing 1, while effectively preventing the second elastic sealing part 321 from over-compressing and failing due to excessive tightening of the second connecting bolt 322 and the housing 1. This effectively ensures the sealing effectiveness of the second elastic sealing part 321.

[0055] Optionally, the second elastic sealing part 321 may be a sealing gasket (e.g., a rubber gasket, a silicone gasket, or other sealing gaskets).

[0056] Similarly, such as Figure 4 As shown, a second rivet nut 112 that cooperates with the second connecting bolt 322 can also be embedded in the middle of the box 1, so that the box 1 and the second connecting bolt 322 can be threadedly connected through the second rivet nut 112 and the second connecting bolt 322.

[0057] It should be noted that the threaded hole of the housing 1 connected to the second connecting bolt 322 is not limited to the way of embedding the second rivet nut 112 on the housing 1. As long as the housing 1 can be provided with an internal threaded hole that mates with the second connecting bolt 322, the internal threaded hole can also be formed by direct machining on the housing 1.

[0058] Preferably, such as Figure 4 As shown, the rigid washer 323 is sleeved on the outside of the second connecting bolt 322 to ensure the uniformity of the force applied by the rigid washer 323 in the circumferential direction of the nut of the second connecting bolt 322.

[0059] Preferably, such as Figure 4As shown in the figure, an example is illustrated where the rigid gasket 323 is fitted onto the outside of the second elastic sealing portion 321. In this way, the rigid gasket 323 can protect the second elastic sealing portion 321, preventing damage during assembly. However, it is not limited to this; as long as the through hole of the bottom protective plate 2 for the second connecting bolt 322 can be sealed, the second elastic sealing portion 321 is not limited to the above description. Figure 4 Examples are shown. For example, not shown in the figure, the second elastic seal can also be fitted over the outside of the rigid gasket.

[0060] Optionally, the rigid gasket 323 can be a metal gasket to ensure the compressive strength of the rigid gasket 323.

[0061] Preferably, such as Figure 4 As shown, the bottom protective plate 2 may be provided with a second countersunk hole, and the nut of the second connecting bolt 322 may be embedded in the second countersunk hole to ensure the flatness of the bottom protective plate 2. Similarly, the second countersunk hole may also be provided between the outer protective plate 21 and the inner plate 22 to facilitate the concealment of the nut of the second connecting bolt 322.

[0062] like Figure 3 and Figure 4 As shown, the battery pack may further include a liquid cooling plate 4 disposed between the housing 1 and the bottom protective plate 2. Preferably, the first connecting bolt 312 passes through the bottom protective plate 2 and the liquid cooling plate 4 sequentially along the first direction F1, and the first connecting bolt 312 is threadedly connected to the housing 1 to accommodate a battery pack in which the bottom of the housing 1 of the battery pack is provided with a liquid cooling plate 4.

[0063] Correspondingly, the second connecting bolt 322 can also pass through the bottom guard plate 2 and the liquid cooling plate 4 in sequence, and the first connecting bolt 312 is threadedly connected to the housing 1, so as to improve the connection stability between the housing 1 of the battery pack and the bottom guard plate 2, where the liquid cooling plate 4 is set at the bottom of the housing 1.

[0064] The second aspect of this application also provides a battery pack, including the aforementioned housing 1, the aforementioned bottom protective plate 2, and the sealing structure described in any of the aforementioned embodiments, thus possessing all the beneficial technical effects of the sealing structure, which will not be repeated here.

[0065] Preferably, such as Figure 1 , Figure 3 and Figure 4 As shown, the battery pack may include the liquid cooling plate 4.

[0066] Optionally, the liquid cooling plate 4 can be fixedly connected to the housing 1 via a hot-melt process.

[0067] Preferably, such as Figure 1As shown, the battery pack may also include an insulation layer 5, which may be disposed between the bottom protective plate 2 and the liquid cooling plate 4 to insulate the liquid cooling plate 4 and improve the cooling effect of the liquid cooling plate 4.

[0068] Optionally, such as Figure 1 As shown, the above-mentioned insulation layer 5 can be an insulation material (e.g., non-porous foam).

[0069] An embodiment of the third aspect of this application also provides a vehicle including the sealing structure and battery pack described in any of the above embodiments, thus possessing all the beneficial technical effects of the sealing structure and battery pack, which will not be repeated here.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A sealing structure, characterized in that, The battery pack includes a housing and a bottom cover plate arranged facing each other along a first direction. The sealing structure is used to connect the housing and the bottom cover plate. The sealing structure includes an edge sealing assembly. The edge sealing assembly includes a first elastic sealing part, a rigid limiting part, and a first connecting bolt. The first elastic sealing part is arranged at least around the edge of the housing. The first connecting bolt passes through the bottom guard plate and is threaded to the box body along the first direction, and the first elastic sealing part is press-fitted between the bottom guard plate and the box body; The rigid limiting part is disposed on the bottom guard plate and the box body, and the size of the rigid limiting part in the first direction is smaller than the size of the first elastic sealing part in its natural elongation state.

2. The sealing structure according to claim 1, characterized in that, The first elastic sealing part has a dimension of h in the first direction in its natural state, and the rigid limiting part has a dimension of 0.4h to 0.6h in the first direction.

3. The sealing structure according to claim 1, characterized in that, The number of the first connecting bolts is multiple, and the multiple first connecting bolts are spaced apart along the edge of the housing.

4. The sealing structure according to claim 3, characterized in that, Each of the first connecting bolts is fitted with the rigid limiting part.

5. The sealing structure according to claim 1, characterized in that, The battery pack also includes a liquid cooling plate disposed between the housing and the bottom protective plate. The first connecting bolt passes through the bottom protective plate and the liquid cooling plate in sequence, and the first connecting bolt is threadedly connected to the housing.

6. The sealing structure according to any one of claims 1 to 5, characterized in that, It also includes a central sealing assembly for connecting the middle of the housing and the middle of the bottom protective plate; The central sealing assembly includes a second elastic sealing part, a rigid gasket, and a second connecting bolt. The second connecting bolt passes through the second elastic sealing part and the bottom protective plate in sequence along the first direction, and the second connecting bolt is threadedly connected to the housing. Both the rigid gasket and the second elastic sealing part are placed between the nut of the second connecting bolt and the bottom protective plate; The rigid gasket and the second elastic sealing part are aligned with each other in the first direction, and in the first direction, the size of the rigid gasket is smaller than the size of the second elastic sealing part in its natural state.

7. The sealing structure according to claim 6, characterized in that, The bottom protective plate is provided with a countersunk hole, and the nut of the first connecting bolt or the second connecting bolt is embedded in the countersunk hole.

8. The sealing structure according to claim 6, characterized in that, The rigid washer is sleeved on the outside of the second connecting bolt; Alternatively, the rigid gasket may be fitted onto the outside of the second elastic seal.

9. A battery pack, characterized in that, It includes the housing, the bottom protective plate, and the sealing structure according to any one of claims 1 to 8.

10. A vehicle, characterized in that, Includes the battery pack as described in claim 9.

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