A waterproof structure for battery pack casing

Abstract

This utility model discloses a waterproof battery pack casing structure, including a housing and a cover. The housing has an opening at the top and an injection-molded bracket inside. The injection-molded bracket is located near the opening. Both ends of the injection-molded bracket have connecting frames, and the side of the connecting frame closest to the housing has a bearing flange. The cover is positioned above the housing, and both ends of the bottom have folded edges. The folded edges include an inclined portion and an extension portion. The inclined portion is angled towards the injection-molded bracket for contact and positioning with the housing. The top of the extension portion connects to the inclined portion and is located between the connecting frame and the cover. A glue injection groove is formed between the connecting frame, the bearing flange, the extension portion, and the inner wall of the housing, and adhesive silicone is placed in the glue injection groove. The cover can be directly inserted into the glue groove for fixed installation. The adhesive silicone has good elasticity, adhesion, and waterproof properties. After curing, the adhesive silicone can tightly bond with surrounding components, maintaining a good seal.

Description

Technical Field

[0001] This utility model relates to the field of battery waterproofing processing technology, specifically to a waterproof structure for a battery pack casing. Background Technology

[0002] In current technologies, the mainstream solution for waterproofing sheet metal parts mainly relies on the method of flanged edges of the enclosure combined with sealing rings for compression. However, this solution requires the flanged edge to be at least 8mm in size, significantly encroaching on the valuable internal space of the enclosure. In applications with strict space constraints, such as two-wheeled vehicles, this solution becomes unfeasible if the enclosure size cannot meet this requirement. For straight-edge sheet metal enclosures, existing technologies face a double challenge: firstly, when using side sealing rings, the inherent processing tolerances of sheet metal parts often make it difficult to consistently achieve the IPX7 waterproof standard; secondly, during assembly, the side sealing rings are prone to displacement and slippage when the lid is closed, leading not only to insufficient waterproof performance stability but also to difficult assembly operations, low production line efficiency, and difficulty in adapting to large-scale production needs. Another alternative is to directly apply adhesive to seal the enclosure. However, for straight-edge sheet metal enclosures, the process of applying adhesive to the enclosure wall is cumbersome and requires manual secondary cleaning of any excess adhesive. This solution places extremely high demands on the precise control of adhesive application and the adhesive properties (such as viscosity and curing characteristics), which is also unfavorable for large-scale and efficient implementation on production lines. More importantly, once rework and repair are required, disassembling the casing will be unavoidable, which is not only a complicated process but also leads to a significant increase in material losses and after-sales costs. Utility Model Content

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a waterproof battery pack casing structure to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts a waterproof battery pack casing structure, including a housing and a cover, comprising: The top of the housing has an opening, and an injection-molded bracket is provided inside. The injection-molded bracket extends along a first direction and is positioned close to the opening. Both ends of the injection-molded bracket along the first and second directions have connecting frames, and the connecting frames have a load-bearing flange on the side of the connecting frame closest to the housing.

[0005] The lid is positioned above the box body, and its bottom has folding edges at both ends along the first and second directions. Each folding edge includes an inclined portion and an extension portion. The inclined portion is angled towards the injection molding bracket to abut and limit contact with the box body. The top of the extension portion connects to the inclined portion and is positioned between the connecting frame and the lid. A glue injection groove is formed between the connecting frame, the bearing flange, the extension portion, and the inner wall of the box body, and adhesive silicone is provided in the glue injection groove.

[0006] This utility model provides a waterproof battery pack casing structure. The casing and cover are joined by a connecting frame, a bearing flange, and an extension to form a relatively complex annular area, namely an injection groove. Adhesive silicone, possessing excellent elasticity, adhesion, and waterproof properties, is filled within this groove. It can fill the tiny gaps between the connecting frame, the bearing flange, the extension, and the inner wall of the casing, forming a continuous waterproof seal. This is more reliable than sealing methods relying solely on mechanical connections or simple gaskets. After curing, the adhesive silicone bonds tightly to surrounding components, maintaining a good seal even under conditions of temperature changes and vibration. The inclined portion of the folding cover edge, tilted towards the injection-molded bracket, allows for better positioning during installation, preventing potential misalignment of the cover during installation.

[0007] In some embodiments, the projection shape of the adhesive injection groove in both the first and second directions is U-shaped. Along the third direction, the height of the adhesive silicone is less than the height of the connecting frame, and the first, second, and third directions are perpendicular to each other.

[0008] Using the above technical solution, the projection shape of the injection groove in both the first and second directions is U-shaped. This shape design allows the adhesive silicone to better fill and wrap the area between the connecting frame, the load-bearing flange, the extension, and the inner wall of the casing. The height of the adhesive silicone is less than the height of the connecting frame, making it easier to control the amount of silicone filling and the height after curing during the production process. This helps ensure consistent waterproof performance for each battery pack casing and improves the stability of product quality.

[0009] In some embodiments, the adhesive silicone is a two-component silicone rubber adhesive.

[0010] Using the above technical solution, the two-component silicone rubber adhesive is cured into a soft rubber state with low viscosity and high fluidity. It is widely used in electronic potting (insulation and waterproofing). Compared with single-component silicone or other low-strength adhesives, the two-component silicone rubber adhesive can better resist moisture penetration and maintain good sealing performance even in long-term use and complex environments.

[0011] In some embodiments, the extension portion has a plurality of internally threaded post holes on the side away from the housing, and the plurality of internally threaded post holes are spaced apart along the first direction and the second direction. The top of the connecting frame has a clearance groove corresponding to the plurality of internally threaded post holes. The housing has mounting holes along both the first direction and the second direction, each corresponding to one of the plurality of internally threaded post holes.

[0012] By employing the above technical solution, multiple internally threaded posts are provided in the extension portion and mate with the mounting holes of the casing, multi-point fixing between the casing cover and the casing can be achieved. Compared with traditional single-point or few-point fixing methods, this multi-point fixing method can significantly improve the connection strength between the casing cover and the casing. The multiple internally threaded posts are spaced apart along the first and second directions, ensuring that the fixing force is evenly distributed on the contact surface between the casing cover and the casing. This uniform stress distribution can prevent structural damage caused by excessive local stress, ensuring that the entire battery pack casing maintains a good connection state during long-term use.

[0013] In some embodiments, the housing further includes a battery cell module, with the injection-molded bracket supporting the top of the battery cell module. The bottom of the injection-molded bracket has limiting steps at both ends along the first direction, and the battery cell module abuts against these limiting steps at both ends along the first direction.

[0014] By adopting the above technical solution, the contact between the limiting step and the cell module makes the cell module and the injection molded bracket form a tighter overall structure, which enhances the stability of the internal structure of the battery pack.

[0015] In some embodiments, a clearance is provided between the bearing flange and the housing.

[0016] By adopting the above technical solution, the gap is set to facilitate the insertion of the injection-molded bracket into the box. Furthermore, due to the high viscosity of the adhesive silicone, it will not flow into the gap or only flows in a small amount, thus not affecting the overall waterproof and sealing effect.

[0017] In some embodiments, the connecting frame of the injection-molded bracket and the bearing flange are integrally formed, and the connecting frame is provided with a reinforcing rib on the side away from the housing.

[0018] By adopting the above technical solution, the structure with the connecting frame and the load-bearing flange integrally formed has no connection points, thereby avoiding structural failure caused by loosening or damage of the connection points and improving the overall strength of the structure. The reinforcing ribs can effectively resist bending and torsional forces, ensuring that the connecting frame will not deform when subjected to large loads, further enhancing the strength and rigidity of the connecting frame.

[0019] In some embodiments, the injection-molded bracket has multiple cell connection areas located on the inner side of the connecting frame. Each cell connection area includes a connecting through hole and multiple limiting flanges. The connecting through hole corresponds to multiple cell terminals, and the multiple limiting flanges are located on the inner walls of both sides of the cell connection area for engaging and fixing with aluminum connecting pieces.

[0020] Using the above technical solution, limiting steps are located on the inner walls of both sides of the cell connection area for snap-fit ​​fixing with the aluminum connecting pieces. This snap-fit ​​fixing method ensures that the aluminum connecting pieces will not loosen during use, thereby improving the electrical connection stability of the entire battery pack. Compared with fixing methods that rely solely on bolts or welding, snap-fit ​​fixing can provide more uniform contact pressure and reduce the risk of poor local contact.

[0021] In some embodiments, the top of the lid is further provided with a connector and a vent valve at one end along the first direction.

[0022] Using the above technical solution, the vent valve can automatically open within a certain pressure range to release excess gas, thereby preventing expansion or rupture caused by excessive internal pressure in the battery pack. The vent valve effectively balances the pressure inside and outside the battery pack. The cover has excellent insulation properties, and the connector is integrated into the cover, ensuring the safety of electrical connections. Attached Figure Description

[0023] Figure 1 This is a perspective view of a battery pack according to an embodiment of a waterproof battery pack housing structure of the present invention. Figure 2 This is a cross-sectional view of an embodiment of a waterproof battery pack housing structure according to the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a perspective view of the injection-molded bracket in a waterproof battery pack housing structure according to this utility model; In the picture: 1. Housing; 10. Injection molded bracket; 100. Connecting frame; 101. Load-bearing flange; 11. Reservation gap; 12. Reinforcing rib; 13. Clearance groove; 14. Mounting hole; 15. Limiting step; 16. Battery cell module; 17. Battery cell connection area; 18. Connecting through hole; 19. Limiting flange; 2. Case lid; 20. Fold-down lid edge; 21. Inclined part; 22. Extension part; 23. Glue injection groove; 24. Internal threaded post; 25. Connector; 26. Vent valve. Detailed Implementation

[0024] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0025] refer to Figures 1 to 4 , Figure 1 This illustration shows a perspective view of a battery pack with a waterproof battery pack housing structure according to an embodiment of the present invention. Figure 2 A cross-sectional view of a waterproof battery pack housing structure provided in an embodiment of the present invention is shown; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 2 A perspective view of the injection-molded bracket 10 in a waterproof battery pack housing structure provided by an embodiment of the present invention is shown.

[0026] like Figures 1 to 4 As shown, the technical solution provided in this application is a waterproof battery pack casing structure, including a casing 1 and a casing cover 2, comprising: The top of the housing 1 has an opening, and an injection molding bracket 10 is provided inside. The injection molding bracket 10 is along the first direction ( Figure 1 Extending along the first and second directions (as shown in the X direction), and positioned close to the opening. The injection-molded bracket 10 extends along the first and second directions (as shown in the X direction). Figure 1 Both ends of the box 1 are provided with connecting frame 100, and the side of the connecting frame 100 near the box 1 is provided with a bearing flange 101.

[0027] The lid 2 is positioned above the body 1, and has folded edges 20 at both ends of its bottom along the first and second directions. Each folded edge 20 includes an inclined portion 21 and an extension portion 22. The inclined portion 21 is inclined towards the injection molding bracket 10 and is used to abut and limit contact with the body 1. The top of the extension portion 22 is connected to the inclined portion 21 and is located between the connecting frame 100 and the lid 2. A glue injection groove 23 is formed between the connecting frame 100, the bearing flange 101, the extension portion 22, and the inner wall of the body 1. The glue injection groove 23 contains adhesive silicone.

[0028] This application provides a waterproof battery pack casing structure. The casing 1 and the cover 2 are connected by a connecting frame 100, a bearing flange 101, and an extension 22, forming a relatively complex annular area, namely a glue injection groove 23. Adhesive silicone is filled into the glue injection groove 23, and the cover 2 can be directly inserted into the groove for fixed installation. The adhesive silicone has good elasticity, adhesion, and waterproofness. It can fill the tiny gaps between the connecting frame 100, the bearing flange 101, the extension 22, and the inner wall of the casing 1, forming a continuous waterproof sealing layer. This is more reliable than sealing methods relying solely on mechanical connections or simple sealing gaskets. After curing, the adhesive silicone can bond tightly to surrounding components, maintaining a good seal even under conditions such as temperature changes and vibration. The inclined portion 21 of the folding cover edge 20 is tilted towards the injection-molded bracket 10, allowing for better positioning during installation and preventing potential misalignment of the cover 2 during installation.

[0029] In some embodiments, reference Figures 1 to 4 The projection shape of the glue injection groove 23 in both the first and second directions is U-shaped. Along the third direction ( Figure 1 (As shown in the Z direction), the height of the adhesive silicone is less than the height of the connecting frame, and the first, second, and third directions are perpendicular to each other.

[0030] For example, the injection groove 23 has a U-shaped projection in both the first and second directions. This shape design allows the adhesive silicone to better fill and wrap the area between the connecting frame 100, the bearing flange 101, the extension 22, and the inner wall of the housing 1. The height of the adhesive silicone is less than the height of the connecting frame, making it easier to control the amount of silicone filling and the height after curing during the production process. This helps ensure consistent waterproof performance for each battery pack housing and improves the stability of product quality.

[0031] In some embodiments, the adhesive silicone is a two-component silicone rubber adhesive.

[0032] For example, the two-component silicone rubber adhesive, after curing, is a soft rubber with low viscosity and high fluidity. It is widely used in electronic potting (insulation, waterproofing). Compared with single-component silicone or other low-strength adhesives, the two-component silicone rubber adhesive can better resist moisture penetration and maintain good sealing performance even in long-term use and complex environments. While ensuring stable adhesion between the top cover and the bracket and housing 1, the use of specific low-adhesion silicone for sealing also takes into account the need for convenient disassembly in specific application scenarios.

[0033] In some embodiments, reference Figures 1 to 4The extension 22 has multiple internally threaded post 24s on the side away from the housing 1, and the multiple internally threaded post 24s are spaced apart along the first direction and the second direction. The top of the connecting frame 100 has a relief groove 13 corresponding to the multiple internally threaded post 24s. The housing 1 has mounting holes 14 along the first direction and the second direction, each corresponding to one of the multiple internally threaded post 24s.

[0034] For example, by providing multiple internally threaded post 24s in the extension 22 and cooperating with the mounting holes 14 in the housing 1, multi-point fixing between the cover 2 and the housing 1 can be achieved. Compared with traditional single-point or few-point fixing methods, this multi-point fixing method can significantly improve the connection strength between the cover 2 and the housing 1. The multiple internally threaded post 24s are spaced apart along the first and second directions, so that the fixing force is evenly distributed on the contact surface of the cover 2 and the housing 1. This uniform stress distribution can avoid structural damage caused by excessive local stress and ensure that the entire battery pack housing maintains a good connection state during long-term use.

[0035] In some embodiments, reference Figures 1 to 4 Inside the housing 1, there is also a battery cell module 16, and the injection molding bracket 10 is supported on the top of the battery cell module 16. The bottom of the injection molding bracket 10 is provided with limiting steps 15 at both ends along the first direction, and the battery cell module 16 is abutted against the limiting steps 15 at both ends along the first direction.

[0036] For example, after the battery cell is installed in the housing 1, there is no constraint above it. The injection molding bracket 10 can effectively limit the longitudinal displacement of the battery cell, while the abutting cooperation between the limiting step 15 and the battery cell module 16 can effectively limit the lateral displacement of the battery cell. This makes the battery cell module 16 and the injection molding bracket 10 form a tighter overall structure, which enhances the stability of the internal structure of the battery pack.

[0037] In some embodiments, reference Figures 1 to 4 A gap 11 is provided between the bearing flange 101 and the housing 1.

[0038] For example, by setting the retention gap 11, it is easy to insert the injection-molded bracket 10 into the housing 1, and the adhesive silicone used, due to its high viscosity, will not or only a small amount will flow into the retention gap 11, thus not affecting the overall waterproof sealing effect.

[0039] In some embodiments, reference Figures 1 to 4 The connecting frame 100 and the bearing flange 101 of the injection-molded bracket 10 are integrally formed, and the connecting frame 100 is provided with a reinforcing rib 12 on the side away from the box body 1.

[0040] For example, the integrally formed structure of the connecting frame 100 and the bearing flange 101 has no connection points, thereby avoiding structural failure due to loosening or damage of the connection points and improving the overall strength of the structure. The reinforcing rib 12 can effectively resist bending and torsional forces, so that the connecting frame 100 will not deform when subjected to large loads, further enhancing the strength and rigidity of the connecting frame 100.

[0041] In some embodiments, reference Figures 1 to 4 The injection-molded bracket 10 has multiple cell connection areas 17, which are located on the inner side of the connecting frame 100. Each cell connection area 17 includes a connecting through hole 18 and multiple limiting flanges 19. The connecting through hole 18 is correspondingly provided with multiple cell terminals, and the multiple limiting flanges 19 are located on the inner walls on both sides of the cell connection area 17 for engaging and fixing with aluminum connecting pieces.

[0042] For example, limiting steps 15 are provided on the inner walls of both sides of the cell connection area 17 for snap-fit ​​fixing with the aluminum connecting piece. This snap-fit ​​fixing method ensures that the aluminum connecting piece will not loosen during use, thereby improving the electrical connection stability of the entire battery pack. Compared with fixing methods that rely solely on bolts or welding, snap-fit ​​fixing can provide more uniform contact pressure and reduce the risk of poor local contact.

[0043] In some embodiments, reference Figures 1 to 4 The top of the cover 2 is also provided with a connector 25 and a vent valve 26 at one end along the first direction.

[0044] For example, the vent valve 26 can automatically open within a certain pressure range to release excess gas, thereby preventing expansion or rupture caused by excessive internal pressure of the battery pack. By setting the vent valve 26, the pressure inside and outside the battery pack can be effectively balanced. The cover 2 has good insulation properties, and the connector 25 is integrated into the cover 2 to ensure the safety of electrical connections.

[0045] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A waterproof battery pack casing structure, comprising a casing and a cover, characterized in that, The waterproof structure of the battery pack housing includes: The top of the box has an opening and an injection molding bracket inside; the injection molding bracket extends along a first direction and is located close to the opening; both ends of the injection molding bracket along the first and second directions have connecting frames, and the side of the connecting frame close to the box has a load-bearing flange. The lid is positioned above the box body, and the bottom has folding edges at both ends along the first and second directions. Each folding edge includes an inclined portion and an extension portion. The inclined portion is inclined toward the injection molding bracket and is used to abut and limit the box body. The top of the extension portion is connected to the inclined portion and is located between the connecting frame and the lid. An injection groove is formed between the connecting frame, the bearing flange, the extension portion, and the inner wall of the box body, and adhesive silicone is provided in the injection groove.

2. The waterproof battery pack housing structure according to claim 1, characterized in that, The projection shape of the glue injection groove in both the first and second directions is U-shaped; along the third direction, the height of the adhesive silicone is less than the height of the connecting frame, and the first, second, and third directions are perpendicular to each other.

3. The waterproof battery pack housing structure according to claim 1, characterized in that, The adhesive silicone is a two-component silicone rubber adhesive.

4. The waterproof battery pack housing structure according to claim 1, characterized in that, The extension portion is provided with a plurality of internally threaded post holes on the side away from the housing, and the plurality of internally threaded post holes are spaced apart along the first direction and the second direction; the top of the connecting frame is provided with a clearance groove corresponding to the plurality of internally threaded post holes; the housing is provided with mounting holes along both the first direction and the second direction, each corresponding to one of the plurality of internally threaded post holes.

5. The waterproof battery pack housing structure according to claim 1, characterized in that, The housing is also equipped with a battery cell module, and the injection molding bracket supports the top of the battery cell module; the bottom of the injection molding bracket is provided with limiting steps at both ends along the first direction, and the battery cell module is abutted against the limiting steps at both ends along the first direction.

6. The waterproof battery pack housing structure according to claim 1, characterized in that, A gap is provided between the bearing flange and the housing.

7. The waterproof battery pack housing structure according to claim 1, characterized in that, The connecting frame of the injection-molded bracket and the bearing flange are integrally formed, and the connecting frame is provided with a reinforcing rib on the side away from the box body.

8. The waterproof battery pack housing structure according to claim 1, characterized in that, The injection-molded bracket has multiple cell connection areas, which are located on the inner side of the connecting frame. Each cell connection area includes a connecting through hole and multiple limiting flanges. The connecting through hole is corresponding to multiple cell terminals, and the multiple limiting flanges are located on the inner walls on both sides of the cell connection area for engaging and fixing with aluminum connecting pieces.

9. The waterproof battery pack housing structure according to claim 1, characterized in that, The top of the box cover is also provided with a connector and a vent valve at one end along the first direction.

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