Multistage waterproof structure and battery shell

Abstract

The utility model discloses a multi-stage waterproof structure and a battery shell, and relates to the technical field of battery pack waterproof structures. The multi-stage waterproof structure comprises a shell, a waterproof support, a cover body sealing ring and a support sealing ring. The shell comprises a cover body and a box body which are buckled with each other along a first direction; the waterproof support is located between the cover body and the box body in the first direction and connected with the cover body and the box body, and the waterproof support comprises a first waterproof layer used for making contact with the cover body and a second waterproof layer used for making contact with the box body. The first waterproof layer is filled with the cover body sealing ring, and the first waterproof layer is further provided with an inclined plane, so that when the shell and the waterproof support are in press fit, the cover body sealing ring can be attached to the inclined plane; the support sealing ring is located on the second waterproof layer. By adopting the technology provided by the utility model, liquid gaps can be effectively prevented from seeping into the battery.

Description

Technical Field

[0001] This utility model relates to the field of waterproof battery pack structure technology, specifically to a multi-level waterproof structure and a battery casing. Background Technology

[0002] In the electric vehicle industry, the waterproof design of sheet metal battery casings is crucial to ensure their safety and reliability under various environmental conditions. Generally, battery pack casings are developed to meet IP67 (1m water depth, 30min immersion) or IP68 (1m water depth, 24h immersion) design requirements to ensure the battery pack is sealed and waterproof, preventing short circuits due to water ingress. Therefore, current common practice among manufacturers is to use a bent, flanged design with sealing gaskets on the upper and lower covers of the battery pack. Simultaneously, the bolt holes of the sealing gaskets are pressed against the riveting nuts on the flanged edge of the lower cover, and the bolts are tightened to ensure full compression and coupling between the flanged edges and the sealing gaskets, guaranteeing the battery pack's dustproof and waterproof rating. However, this structure results in excessively large gaps between the upper and lower covers, allowing liquids to potentially seep into the battery through these gaps, leading to a short circuit. Utility Model Content

[0003] This invention provides a multi-level waterproof structure and battery casing to solve the problem in the prior art that liquid may still seep into the battery through the gap between the upper and lower covers.

[0004] To solve the above-mentioned technical problems, the present invention provides a multi-level waterproof structure, which includes: a shell, a waterproof bracket, a cover sealing ring, and a bracket sealing ring.

[0005] The housing includes a cover and a box that are interlocked along a first direction; the waterproof bracket is located between the cover and the box along the first direction and is connected to the cover and the box respectively, wherein the waterproof bracket includes a first waterproof layer for contacting the cover and a second waterproof layer for contacting the box.

[0006] The cover sealing ring is filled in the first waterproof layer, wherein the first waterproof layer is also provided with an inclined surface, so that when the shell and the waterproof bracket are pressed together, the cover sealing ring can fit against the inclined surface; the bracket sealing ring is located in the second waterproof layer.

[0007] The beneficial effects of the technical solution provided by this utility model compared to the prior art are as follows:

[0008] By setting the cover sealing ring and the bracket sealing ring to cooperate with the first and second waterproof layers of the waterproof bracket, a multi-level sealing structure is formed. The first waterproof layer has an inclined surface, and the cover sealing ring fits against this inclined surface. This allows the cover sealing ring to be interference-fitted into the first waterproof layer during battery pack assembly. After the cover and waterproof bracket are fastened together, the cover sealing ring will self-deform to fill all gaps in the first waterproof layer, preventing liquid from seeping through the gap between the cover and the casing.

[0009] In addition, a support sealing ring is installed between the casing and the waterproof bracket to further prevent liquid penetration. Compared to the current waterproof structure that uses folding and locking bolts to press the upper and lower covers together, the above-mentioned multi-level waterproof structure can effectively avoid gaps between different components. Utilizing the tight fit between the cover sealing ring and the casing sealing ring under force, the waterproof effect can be further improved, effectively preventing liquid from seeping into the battery from the gap between the cover and the casing, thus improving the battery's safety and reliability.

[0010] In some embodiments, the second waterproof layer further includes a plurality of first annular flanges, and the bracket sealing ring is provided with a second annular flange capable of engaging with the first annular flanges. By employing the above technical solution, the engagement of the first and second annular flanges improves the tightness of the fit between the bracket sealing ring and the waterproof bracket, thereby preventing liquid from seeping between them.

[0011] In some embodiments, the cover sealing ring further includes a third annular flange for engaging with the inclined surface. The engagement between the inclined surface and the third annular flange allows the cover sealing ring to contact the inclined surface through pressure applied by the protrusions, ensuring that the cover sealing ring can further engage with the inner wall of the housing along a second direction, thereby improving the waterproofing effect of the cover sealing ring.

[0012] In some embodiments, the waterproof bracket is provided with a gap groove on the side facing the inner wall of the box along the second direction, wherein the gap groove communicates with the first waterproof layer, so that when the waterproof bracket and the box respectively press the cover sealing ring, the cover sealing ring can overflow into the gap.

[0013] By adopting the above technical solution, the reserved gap groove allows the sealing ring of the cover to deform and fill the area when the cover is squeezed, thereby further enhancing the waterproof effect.

[0014] In some embodiments, the gap is located between the first waterproof layer and the second waterproof layer along the first direction. The gap, located between the first and second waterproof layers, serves as a new waterproof barrier between them, and it effectively utilizes the space of the waterproof support to facilitate the smooth overflow of the cover seal.

[0015] In some embodiments, the bracket sealing ring further includes a plurality of first screw holes, wherein the housing is provided with a plurality of first locking bolts that can engage with the first screw holes in a circumferential manner, and the first locking bolts pass through the housing, the bracket sealing ring and the waterproof bracket in a second direction in sequence.

[0016] By adopting the above technical solution, the bracket sealing ring, the box body and the waterproof bracket are tightly connected together by the first locking bolt on the side of the box, so as to ensure the tight fit between the components and improve the overall waterproof performance of the battery pack.

[0017] In some embodiments, a sealing oil is also filled between the housing and the cover, such that when the cover and the housing are fastened together in the first direction, the sealing oil can fill the gap between the cover and the housing; wherein at least a portion of the cover sealing ring is located between the housing and the cover.

[0018] Using the above technical solution, the cover also has a flange on the side facing the box in the first direction to fit with the cover sealing ring, and it also facilitates the positioning of the battery pack by the staff during assembly. When the cover and the box are pressed together, the pressure can squeeze out the sealing oil, so that the sealing oil is evenly coated on the contact surface between the cover and the box, thereby achieving the initial waterproofing of the battery pack.

[0019] In some embodiments, this application also provides a battery casing including the aforementioned multi-level waterproof structure.

[0020] In some implementations, the cover includes a first cover and a second cover, which are respectively fastened to the box body along a first direction; wherein, the first cover can be combined with the box body to form the multi-level waterproof structure, and the second cover can be combined with the box body to form the multi-level waterproof structure.

[0021] By adopting the above technical solution, and by designing the cover as a first cover and a second cover, both of which can be combined with the box to form a multi-level waterproof structure, the overall waterproof performance of the battery casing can be further improved, meeting the waterproof requirements of the battery pack. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0023] Figure 1 This is an example of an explosion of a multi-level waterproof structure provided by this utility model. Figure 1 ;

[0024] Figure 2 This is an example of an explosion of a multi-level waterproof structure provided by this utility model. Figure 2 ;

[0025] Figure 3 This is a side view of an embodiment of a waterproof bracket with a multi-level waterproof structure provided by this utility model;

[0026] Figure 4 This is a partial enlarged view of an embodiment of a multi-level waterproof structure provided by this utility model;

[0027] Figure 5 This is a three-dimensional structural diagram of an embodiment of a waterproof bracket with a multi-level waterproof structure provided by this utility model;

[0028] Figure 6 This is a three-dimensional structural schematic diagram of an embodiment of a multi-level waterproof structure bracket sealing ring provided by this utility model;

[0029] Figure 7 This is a three-dimensional structural schematic diagram of an embodiment of a multi-level waterproof structure cover sealing ring provided by this utility model;

[0030] Figure 8 This is a three-dimensional structural schematic diagram of one embodiment of a battery casing provided by this utility model.

[0031] In the picture:

[0032] 10. Shell; 11. Cover; 12. Box; 120. First locking bolt; 20. Waterproof bracket; 21. First waterproof layer; 210. Inclined surface; 22. Second waterproof layer; 220. First annular flange; 23. Gap groove; 24. Second locking bolt; 30. Cover sealing ring; 31. Third annular flange; 32. Second screw hole; 40. Bracket sealing ring; 41. Second annular flange; 42. First screw hole. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0034] For ease of subsequent description, this application will first combine [the following text is incomplete and requires further context] with the specific structure of the multi-level waterproof structure and battery casing. Figure 2 A first direction (Z) and a second direction (X) are defined. The first direction is the height direction of the multi-level waterproof structure when it is normally placed, for example, the Z direction; the second direction is the length direction of the multi-level waterproof structure when it is normally placed, for example, the X direction. In this application, the first direction (Z) and the second direction (X) are perpendicular to each other. It is understood that the perpendicularity in this application is not absolute; approximate perpendicularity due to processing and assembly errors (e.g., an angle of 89.9° between two structural features) is also within the scope of perpendicularity in this application.

[0035] See Figures 1 to 4 As shown, Figure 1 An explosion is shown in one embodiment of a multi-level waterproof structure provided in this application. Figure 1 ; Figure 2 An explosion is shown in one embodiment of a multi-level waterproof structure provided in this application. Figure 2 ; Figure 3 A side view of an embodiment of a waterproof bracket 20 with a multi-level waterproof structure provided in this application is shown; Figure 4 A partial enlarged view of an embodiment of a multi-level waterproof structure provided in this application is shown.

[0036] In some embodiments, the multi-level waterproof structure includes: a housing 10, a waterproof bracket 20, a cover sealing ring 30, and a bracket sealing ring 40. The housing 10 includes a cover 11 and a box 12 that are interlocked along a first direction; the waterproof bracket 20 is located between the cover 11 and the box 12 along the first direction and is connected to the cover 11 and the box 12 respectively, wherein the waterproof bracket 20 includes a first waterproof layer 21 for contacting the cover 11 and a second waterproof layer 22 for contacting the box 12.

[0037] The cover sealing ring 30 is filled in the first waterproof layer 21, wherein the first waterproof layer 21 is also provided with an inclined surface 210, so that when the shell 10 and the waterproof bracket 20 are pressed together, the cover sealing ring 30 can fit with the inclined surface 210; the bracket sealing ring 40 is located in the second waterproof layer 22.

[0038] In this embodiment, a multi-layered sealing structure is formed by setting a cover sealing ring 30 and a bracket sealing ring 40 to cooperate with the first waterproof layer 21 and the second waterproof layer 22 of the waterproof bracket 20, respectively. The first waterproof layer 21 has an inclined surface 210, and the cover sealing ring 30 fits against the inclined surface 210. This allows the cover sealing ring 30 to be filled into the first waterproof layer 21 in an interference fit during battery pack assembly. When the cover 11 and the waterproof bracket 20 are fastened together, the cover sealing ring 30 will self-deform to fill all the gaps in the first waterproof layer 21, preventing liquid from seeping through the gap between the cover 11 and the housing 12.

[0039] In addition, a support sealing ring 40 is provided between the housing 12 and the waterproof bracket 20 to further prevent liquid penetration. Compared with the current waterproof structure, the above-mentioned multi-level waterproof structure can effectively avoid gaps between different components. By utilizing the characteristics of the cover sealing ring 30 and the housing 12 sealing ring to fit tightly under force, the waterproof effect is further improved, thereby effectively preventing liquid from seeping into the battery from the gap between the cover 11 and the housing 12.

[0040] In some implementation schemes, combined Figure 4 As shown, the waterproof bracket 20 has a gap groove 23 on the side facing the inner wall of the box 12 along the second direction. The gap groove 23 is connected to the first waterproof layer 21, so that when the waterproof bracket 20 and the box 12 respectively squeeze the cover sealing ring 30, the cover sealing ring 30 can overflow into the gap.

[0041] For example, Figure 4 The shaded area represents the cover sealing ring 30. Through the pre-reserved gap groove 23, when the cover 11, the housing 12, and the waterproof bracket 20 are pressed against each other, the cover sealing ring 30 can deform and fill the gap groove 23, thereby further enhancing the waterproof effect. The gap groove 23 is formed by the inner wall of the housing 12 and the waterproof bracket 20 spaced apart along the second direction.

[0042] In some applications, the gap 23 is located between the first waterproof layer 21 and the second waterproof layer 22 along the first direction. The gap 23, located between the first waterproof layer 21 and the second waterproof layer 22, can serve as a new waterproof barrier between the two, and the gap 23 can effectively utilize the space of the waterproof bracket 20 to facilitate the smooth overflow of the cover sealing ring 30.

[0043] In some embodiments, sealing oil is also filled between the housing 12 and the cover 11, such that when the cover 11 and the housing 12 are fastened together in the first direction, the sealing oil can fill the gap between the cover 11 and the housing 12; wherein at least a portion of the cover sealing ring 30 is located between the housing 12 and the cover 11.

[0044] In this embodiment, the cover 11 is further provided with a flange on the side facing the housing 12 along the first direction to fit against the cover sealing ring 30, and also facilitates positioning during battery pack assembly. When the cover 11 and housing 12 are pressed together, the pressure can squeeze out sealing oil, thereby uniformly coating the contact surfaces of the cover 11 and housing 12, achieving initial waterproofing of the battery pack.

[0045] In some application scenarios, sealing oil is filled between the cover 11 and the housing 10. When the cover 11 and the housing 10 are tightly fastened, the sealing oil can fill the gap to achieve the first level of waterproofing for the battery. When the cover sealing ring 30 is pressurized by the stepped protrusions formed by the inclined surface 210 and the waterproof bracket 20, the battery can achieve the second level of waterproofing. When the cover sealing ring 30 overflows into the gap groove 23, the battery can achieve the third level of waterproofing. When the bracket sealing ring 40 is locked with the waterproof bracket 20 from the side of the housing 12, the battery can achieve the fourth level of waterproofing.

[0046] See Figure 5 and Figure 6 As shown, Figure 5 This paper shows a three-dimensional structural schematic diagram of an embodiment of a waterproof bracket 20 with a multi-level waterproof structure provided in this application; Figure 6 A three-dimensional structural schematic diagram of an embodiment of a bracket sealing ring 40 with a multi-level waterproof structure provided in this application is shown.

[0047] In some embodiments, the second waterproof layer 22 further includes a plurality of first annular flanges 220, and the bracket sealing ring 40 is provided with a second annular flange 41 capable of engaging with the first annular flanges 220. In this embodiment, combined with... Figure 4 As shown, the interlocking of the first annular flange 220 and the second annular flange 41 improves the tightness of the fit between the bracket sealing ring 40 and the waterproof bracket 20, preventing liquid from seeping in between. For example, the bracket sealing ring 40 may be made of rubber.

[0048] In some application scenarios, combined with Figure 1 As shown, the bracket sealing ring 40 also includes a plurality of first screw holes 42. The housing 12 is provided with a plurality of first locking bolts 120 that can cooperate with the first screw holes 42 in the circumferential direction. The first locking bolts 120 pass through the housing 12, the bracket sealing ring 40 and the waterproof bracket 20 in the second direction in sequence.

[0049] For example, the cover sealing ring 30 also includes a plurality of second screw holes 32, and the cover 11 is provided with a plurality of second locking bolts 24 that can sequentially pass through the cover 11, the cover sealing ring 30 and the waterproof bracket 20 along the first direction, so that a tight connection between the components can be achieved by the plurality of first bolts and the plurality of second bolts. The bracket sealing ring 40, the box 12 and the waterproof bracket 20 are tightly connected together by the first locking bolts 120 on the side of the box 12, and the cover 11, the cover sealing ring 30 and the waterproof bracket 20 are tightly connected together by the second locking bolts 24 on the cover 11, ensuring a tight fit between the components to improve the overall waterproof performance of the battery pack.

[0050] See Figure 7 As shown, Figure 7 A three-dimensional structural schematic diagram of an embodiment of a cover sealing ring 30 with a multi-level waterproof structure provided in this application is shown.

[0051] In some embodiments, the cover sealing ring 30 further includes a third annular flange 31 for engaging with the inclined surface 210. Exemplarily, in combination with... Figure 4 As shown, the inclined surface 210 of the waterproof bracket 20 can also be provided with multiple protrusions, so that the cover sealing ring 30 can contact the inclined surface 210 by the pressure of the protrusions, thereby ensuring that the cover sealing ring 30 can further fit against the inner wall of the box 12 along the second direction, and improve the waterproof effect of the cover sealing ring 30.

[0052] See Figure 8 As shown, Figure 8 A three-dimensional structural schematic diagram of an embodiment of a battery casing provided in this application is shown.

[0053] In some implementation schemes, combined Figure 8 As shown, this application also provides a battery casing, including the aforementioned multi-level waterproof structure. Exemplarily, Figure 8 The device includes a battery cover 11 and a battery housing 12. In some embodiments, the cover 11 may further include a first cover 11 and a second cover 11, which are respectively fastened to the housing 12 along a first direction; wherein the first cover 11 and the housing 12 can be combined to form a multi-level waterproof structure, and the second cover 11 and the housing 12 can be combined to form a multi-level waterproof structure.

[0054] In this embodiment, by designing the cover 11 as a first cover 11 and a second cover 11, both of which can be combined with the housing 12 to form a multi-level waterproof structure, the overall waterproof performance of the battery casing can be further improved, meeting the waterproof requirements of the battery pack.

[0055] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, should be included within the protection scope of this utility model.

Claims

1. A multi-level waterproof structure, characterized in that, include: The housing (10) includes a cover (11) and a box (12) that are interlocked along a first direction. A waterproof bracket (20) is located between the cover (11) and the box (12) along the first direction and is connected to the cover (11) and the box (12) respectively. The waterproof bracket (20) includes a first waterproof layer (21) for contacting the cover (11) and a second waterproof layer (22) for contacting the box (12). A cover sealing ring (30) is filled in the first waterproof layer (21), wherein the first waterproof layer (21) is also provided with an inclined surface (210) so that when the shell (10) and the waterproof bracket (20) are pressed together, the cover sealing ring (30) can fit with the inclined surface (210); The bracket sealing ring (40) is located in the second waterproof layer (22).

2. The multi-level waterproof structure according to claim 1, characterized in that, The second waterproof layer (22) also includes a plurality of first annular flanges (220), and the bracket sealing ring (40) is provided with a second annular flange (41) that can engage with the first annular flanges (220).

3. The multi-level waterproof structure according to claim 1, characterized in that, The cover sealing ring (30) also includes a third annular flange (31) for fitting against the inclined surface (210).

4. The multi-level waterproof structure according to claim 1, characterized in that, The waterproof bracket (20) is provided with a gap groove (23) on the side facing the inner wall of the box (12) along the second direction. The gap groove (23) is connected to the first waterproof layer (21), so that when the waterproof bracket (20) and the box (12) respectively squeeze the cover sealing ring (30), the cover sealing ring (30) can overflow into the gap groove (23).

5. The multi-level waterproof structure according to claim 4, characterized in that, The gap groove (23) is located between the first waterproof layer (21) and the second waterproof layer (22) along the first direction.

6. The multi-level waterproof structure according to claim 1, characterized in that, The bracket sealing ring (40) also includes a plurality of first screw holes (42), wherein the housing (12) is provided with a plurality of first locking bolts (120) that can cooperate with the first screw holes (42) in the circumferential direction, and the first locking bolts (120) pass through the housing (12), the bracket sealing ring (40) and the waterproof bracket (20) in the second direction in sequence.

7. The multi-level waterproof structure according to claim 1, characterized in that, The space between the housing (12) and the cover (11) is filled with sealing oil, such that when the cover (11) and the housing (12) are fastened together in the first direction, the sealing oil can fill the gap between the cover (11) and the housing (12); wherein at least a portion of the cover sealing ring (30) is located between the housing (12) and the cover (11).

8. A battery casing, characterized in that, Includes the multi-level waterproof structure as described in any one of claims 1 to 7.

9. The battery casing according to claim 8, characterized in that, The cover (11) includes a first cover (11) and a second cover (11), the first cover (11) and the second cover (11) being fastened to the box (12) along a first direction respectively; wherein, the first cover (11) can be combined with the box (12) to form the multi-level waterproof structure, and the second cover (11) can be combined with the box (12) to form the multi-level waterproof structure.

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