A battery case sealing structure

Abstract

The utility model relates to a kind of shell sealing structure for battery in the field of battery shell, including bottom shell and the shell cover being set on bottom shell, the periphery of the bottom shell is formed with the protruding protective stop edge by bending, bottom shell is formed with accommodating groove inside bottom shell by the protective stop edge around, the end portion of protective stop edge away from accommodating groove is formed with the clamping stop edge by bending, the end portion of clamping stop edge away from protective stop edge is formed with the connecting stop edge for installation by bending, protective gap is formed between protective stop edge and clamping stop edge, protective frame is oppositely arranged in protective gap, the inside of shell cover is equipped with the accommodating cavity matched with accommodating groove, the installation stop edge matched with connecting stop edge is formed on shell cover by bending, connecting stop edge and installation stop edge are provided with sealing ring, the sealing ring between clamping stop edge cooperation connecting stop edge and installation stop edge of the utility model, the sealing use effect of enhanced sealing joint, the sealing stability and reliability of battery shell are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery casings, and more specifically to a battery casing sealing structure. Background Technology

[0002] With the rapid development of new energy technologies, energy storage batteries, as core energy storage devices, are increasingly widely used in new energy vehicles, energy storage power stations, consumer electronics, aerospace, and other fields. The battery casing, or outer shell, serves as the protective carrier for the battery module and must provide reliable sealing protection under complex operating conditions to resist external moisture, dust, chemical corrosion, and mechanical impact, ensuring the safe and stable operation of the battery system. Therefore, the sealing structure design of the battery casing affects the overall performance, lifespan, and safety of the battery.

[0003] In existing technologies, energy storage battery casings typically employ a split structure, assembled from a bottom shell and a top shell via threaded connections, snap-fit ​​connections, or bolt fastening. To ensure the sealing performance at the junction of the top shell and bottom shell, a common approach is to install an annular sealing ring on the mating surface. This sealing ring is often made of elastic materials such as silicone rubber or fluororubber, and it fills the gap at the mating surface through compression deformation, thereby forming a static seal. This design, due to its simple structure and convenient assembly, was widely used in early battery products and became the mainstream sealing solution.

[0004] However, traditional sealing structures have gradually revealed significant defects in practical use: First, the connection structure between the cover and the bottom shell is relatively simple, and under long-term external mechanical vibration and impact, the connection is prone to deformation or loosening, leading to a decrease in the clamping force of the sealing surface between the cover and the bottom shell. Second, the sealing ring is prone to wear, hardening, or cracking under continuous compression, friction, and environmental aging. Especially in high-temperature, high-humidity, or corrosive environments, the performance degradation of the sealing material is accelerated, significantly reducing the sealing performance at the junction of the cover and the bottom shell. This can lead to safety hazards such as leakage, short circuits, and even thermal runaway. Furthermore, sealing failure allows external impurities to enter, accelerating the aging of the internal battery cells and affecting the sealing stability and reliability of the battery inside the casing. Therefore, there is an urgent need for a battery casing sealing structure with stable and reliable sealing performance. Utility Model Content

[0005] The purpose of this invention is to address the above-mentioned deficiencies and provide a battery casing sealing structure to solve the technical problems of how to improve the sealing effect of the battery casing sealing joint and the stable and reliable use of the sealing structure mentioned in the background art.

[0006] The objective of this utility model is achieved through the following means:

[0007] A battery casing sealing structure includes a bottom shell and a cover mated on the bottom shell. The bottom shell has raised protective edges formed around its perimeter by bending. The protective edges surrounding the bottom shell create a receiving groove inside the bottom shell, with an opening at the top. The end of the protective edges away from the receiving groove is bent to form a retaining edge, which extends towards the bottom of the bottom shell. The end of the retaining edge away from the protective edges is bent to form a connecting edge for installation. A protective gap is formed between the protective edges and the retaining edge. A protective frame is mated within the protective gap. The cover is box-shaped, and its interior has a receiving cavity that matches the receiving groove. The cover is mated and installed on the bottom shell, covering the opening. The cover is mated and mated with the retaining edge through the receiving cavity. An installation edge is formed on the cover by bending, which matches and connects with the connecting edge. A sealing ring is provided between the connecting edge and the installation edge.

[0008] Furthermore, as described above, the protective stop and the retaining stop form a raised positioning part, allowing the cover to be inserted into the positioning part through the receiving cavity.

[0009] The raised positioning part, formed by the protective and retaining edges, achieves precise positioning and assembly of the cover and bottom shell through the accurate mating and insertion of the cover receiving cavity and the positioning part. This reduces uneven gaps at the joint surfaces caused by assembly errors. Under long-term external mechanical vibration and impact, the positioning part provides stable structural support and a larger contact joint surface, preventing deformation or loosening of the connection due to stress concentration, and ensuring a good sealing contact between the cover and bottom shell joint surfaces.

[0010] Furthermore, as described above, the side of the retaining edge contacts the inner wall of the receiving cavity, and the outer side of the retaining edge is bonded and sealed to the inner wall of the receiving cavity with waterproof sealant.

[0011] The retaining edge contacts and fits against the inner wall of the receiving cavity, and is sealed by waterproof sealant to ensure a tight seal between the retaining edge and the cover. Simultaneously, a sealing ring between the connecting edge and the mounting edge creates a double seal, further ensuring the sealing stability and reliability of the cover and bottom shell.

[0012] Furthermore, as described above, the retaining edge and the connecting edge extend in an "L" shape, so that the retaining edge protrudes into the receiving cavity of the cover and mates with the cover to form an isolation structure.

[0013] The protruding extension structure formed by the retaining edge and the connecting edge in an "L" shape, when paired with the housing cavity, constitutes an isolation structure. The protruding retaining edge blocks and isolates the side of the housing, thereby further preventing liquid or dust from entering the housing groove and housing cavity from the joint surface of the connecting edge and the mounting edge. This avoids impurities from entering and accelerating the aging of the internal battery cells, and further improves the stability and reliability of the sealing joint.

[0014] Furthermore, as described above, the connecting stop is provided with multiple connecting holes, and the mounting stop is provided with mounting holes that are matched and connected to the connecting holes, so that the mounting stop is connected to the connecting holes by bolts passing through the mounting holes.

[0015] Furthermore, as described above, the bottom of the base shell is connected to a protective base, the protective base has a mating and insertion groove for mating with the base shell, the edge of the base has a connecting part, so that the connecting edge of the base shell mates with the connecting part, and a waterproof ring is provided between the connecting edge and the connecting part.

[0016] The mounting slots of the bottom shell and the protective base are matched and inserted. Combined with the matching design of the connecting edge and the connecting part and the setting of the waterproof ring, it can prevent impurities from entering the mounting slot. The protective base can provide physical protection for the bottom of the bottom shell, further ensuring the safety and reliability of the bottom shell.

[0017] Furthermore, as described above, the inner wall of the mounting groove and the outer side of the protective frame form a waterproof gap, a drainage channel is provided on the base, a drainage sloping groove is provided on the bottom wall of the mounting groove near the waterproof gap, and a drainage hole is provided on the mounting groove that communicates with the waterproof gap and the drainage channel.

[0018] The waterproof gap formed between the inner wall of the mounting groove and the outer side of the protective frame, combined with the guiding design of the drainage channel, drainage chute, and drainage hole, constitutes an active drainage system. When the battery casing encounters water accumulation or a high-humidity environment, and water seeps into the mounting groove from between the connection part and the connection baffle, the drainage chute guides the liquid to quickly converge to the drainage hole and discharge it through the drainage channel. This prevents liquid from accumulating in the waterproof gap and causing the bottom shell to be soaked, reducing the risk of bottom shell seal failure caused by water accumulation and ensuring long-term stability of the sealing performance.

[0019] Furthermore, as described above, the protective frame is composed of silicone protective pads.

[0020] The protective frame is made of silicone protective pads. Utilizing the excellent aging resistance, elasticity, and corrosion resistance of silicone, combined with the protective base and frame, it reduces the impact of friction or external vibration and compression on the bottom shell within the mounting groove. This ensures the bottom shell maintains a stable structure and reduces safety hazards such as leakage and short circuits in the battery cell components inside the bottom shell caused by compression or vibration, further ensuring stable and reliable protection of the internal battery cell components by the bottom shell.

[0021] The beneficial effects of this utility model are as follows: The raised protective edges formed by bending around the bottom shell together with the retaining edges constitute a double protective structure. The protective edges form a rigid support around the receiving groove, and the extension of the retaining edges forms a retaining pair with the receiving cavity of the shell cover, effectively enhancing the connection strength between the bottom shell and the shell cover, ensuring the continuous and stable pressing force of the joint sealing surface, and the protective frame is paired and set in the protective gap formed between the protective edges and the retaining edges, further ensuring the structural stability and reliability of the bottom shell. At the same time, the shell cover forms a retaining pair with the retaining edges of the bottom shell through the receiving cavity. The retaining edges cooperate with the sealing ring between the connecting edge and the mounting edge to form a multi-joint sealing connection structure, enhancing the sealing effect of the sealing joint, further preventing external impurities from entering the interior, and improving the sealing stability and long-term reliability of the battery shell. Attached Figure Description

[0022] Figure 1 This is a perspective view of the front view angle in this embodiment;

[0023] Figure 2 This is a perspective view of the rear view in this embodiment;

[0024] Figure 3 This is an exploded view of this embodiment;

[0025] Figure 4 This is a cross-sectional view in the first direction of this embodiment;

[0026] Figure 5 This is a cross-sectional view in the second direction of this embodiment;

[0027] Figure 6 for Figure 5 A magnified view of part A in the diagram;

[0028] Figure 7 This is a schematic diagram of the connection status of the battery cell assembly in this embodiment;

[0029] The reference numerals in the figure are as follows:

[0030] 100-Bottom shell, 101-Protective guard edge, 102-Receiving groove, 103-Holding guard edge, 104-Connecting guard edge, 105-Positioning part, 106-Connecting hole;

[0031] 200-Shell cover, 201-Receiving cavity, 202-Mounting flange, 203-Mounting hole;

[0032] 300 - Sealing ring;

[0033] 400-Protective base, 401-Mounting groove, 402-Connecting part, 403-Waterproof gap, 404-Drainage channel, 405-Drainage sloping groove, 406-Drainage hole;

[0034] 500 - Waterproof ring; 600 - Protective frame; 700 - Battery cell assembly. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0036] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer, the following describes the solution in further detail with reference to the accompanying drawings and embodiments.

[0037] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this scheme 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.

[0038] In this embodiment, refer to Figures 1-7 The present invention relates to a battery casing sealing structure, comprising a bottom shell 100 and a cover 200 mating on the bottom shell 100. The bottom shell 100 has raised protective edges 101 formed around its perimeter by bending. The protective edges 101 surround the bottom shell 100, forming a receiving groove 102 inside the bottom shell 100. The top of the receiving groove 102 has an opening. The end of the protective edges 101 away from the receiving groove 102 is bent to form a retaining edge 103. The retaining edge 103 extends towards the bottom of the bottom shell 100, and the end of the retaining edge 103 away from the protective edges 101 is bent to form a mounting bracket. A protective gap is formed between the connecting baffle 104, the protective baffle 101, and the retaining baffle 103. A protective frame 600 is paired and arranged in the protective gap. The cover 200 is box-shaped and has a receiving cavity 201 that matches the receiving groove 102 inside. The cover 200 is paired and installed on the bottom shell 100 and blocks the opening, so that the cover 200 is locked and matched with the retaining baffle 103 through the receiving cavity 201. The cover 200 has a mounting baffle 202 that matches and connects with the connecting baffle 104 by bending. A sealing ring 300 is provided between the connecting baffle 104 and the mounting baffle 202.

[0039] The protective baffle 101 and the retaining baffle 103 form a raised positioning part 105, allowing the cover 200 to be inserted into the receiving cavity 201 and the positioning part 105. The raised positioning part 105, formed by the protective baffle 101 and the retaining baffle 103, achieves precise positioning and assembly of the cover 200 and the bottom shell 100 through the precise insertion of the cover 200 into the receiving cavity 201. This reduces uneven gaps at the joint surfaces caused by assembly errors. Under long-term external mechanical vibration and impact, the positioning part 105 provides stable structural support and a larger contact joint surface, preventing deformation or loosening of the connecting part 402 due to stress concentration, and ensuring a good sealing contact between the cover 200 and the bottom shell 100.

[0040] Specifically, the protective baffle 101 and the retaining baffle 103 are bent into a protruding structure, forming a "U" shape so that they can be inserted into the receiving cavity 201. The retaining baffle 103 contacts the inner wall of the receiving cavity 201, making it protrude relative to the connecting baffle 104, thereby further reducing the intrusion of external debris between the connecting baffle 104 and the mounting baffle 202.

[0041] The side of the retaining edge 103 contacts the inner wall of the receiving cavity 201, and the outer side of the retaining edge 103 is bonded and sealed to the inner wall of the receiving cavity 201 with waterproof sealant. The contact and fit between the side of the retaining edge 103 and the inner wall of the receiving cavity 201, and the sealing through waterproof sealant, ensure a sealed connection between the retaining edge 103 and the cover 200. Simultaneously, the sealing ring 300 between the connecting edge 104 and the mounting edge 202 forms a double sealing guarantee. This further ensures the sealing stability and reliability of the cover 200 and the bottom shell 100.

[0042] Specifically, the outer side of the retaining edge 103 contacts and mates with the inner wall of the receiving cavity 201, and waterproof sealant is applied to the outer side of the retaining edge 103 to further ensure the stability and reliability of the connection between the bottom shell 100 and the shell cover 200, and reduce the intrusion of external debris.

[0043] The retaining edge 103 and the connecting edge 104 extend in an "L" shape, causing the retaining edge 103 to protrude into the receiving cavity 201 of the cover 200 and mate with the cover 200 to form an isolation structure. This protruding extension structure formed by the retaining edge 103 and the connecting edge 104, after mating with the receiving cavity 201 of the cover 200, constitutes an isolation structure. The protruding retaining edge 103 blocks and isolates the sides, further preventing liquids or dust from entering the receiving groove 102 and the receiving cavity 201 from the mating surface of the connecting edge 104 and the mounting edge 202. This avoids impurities from entering and accelerating the aging of the internal battery cells, further improving the stability and reliability of the sealing connection.

[0044] The connecting baffle 104 has multiple connecting holes 106, and the mounting baffle 202 has mounting holes 203 that are matched and connected to the connecting holes 106, so that the mounting baffle 202 is connected to the connecting holes 106 by bolts passing through the mounting holes 203.

[0045] Specifically, in this embodiment, both the connecting baffle 104 and the mounting baffle 202 are provided with clearance openings, so that the protective base 400 is provided with fixing holes for fixed installation. The protective base 400 can be fixedly installed to the external fixing structure by bolts passing through the fixing holes.

[0046] The bottom of the base shell 100 is connected to a protective base 400. The protective base 400 has a mating and insertion mounting groove 401 that is mated with the base shell 100. The edge of the base has a connecting part 402, so that the connecting baffle 104 of the base shell 100 is mated with the connecting part 402. A waterproof ring 500 is provided between the connecting baffle 104 and the connecting part 402.

[0047] The bottom shell 100 and the mounting groove 401 of the protective base 400 are paired and inserted. Combined with the matching design of the connecting edge 104 and the connecting part 402 and the setting of the waterproof ring 500, impurities can be prevented from entering the mounting groove 401. The protective base 400 can provide physical protection for the bottom of the bottom shell 100, further ensuring the safety and reliability of the bottom shell 100 in use.

[0048] The protective base 400 provides a high-strength, compression-resistant structure for the bottom of the housing 100, thus providing a stable and reliable safety structure for the battery cell assembly 700 inside the housing.

[0049] The inner wall of the mounting groove 401 and the outer side of the protective frame 600 form a waterproof gap 403. A drainage channel 404 is provided on the base. A drainage inclined groove 405 is provided on the bottom wall of the mounting groove 401 near the waterproof gap 403. A drainage hole 406 is provided on the mounting groove 401 to communicate with the waterproof gap 403 and the drainage channel 404.

[0050] The waterproof gap 403 formed between the inner wall of the mounting groove 401 and the outer side of the protective frame 600, together with the conductive design of the drainage channel 404, the drainage sloping groove 405, and the drainage hole 406, constitutes an active drainage system. When the battery casing encounters water accumulation or a high-humidity environment, and water enters the mounting groove 401 between the connecting part 402 and the connecting baffle 104, the liquid can be guided by the drainage sloping groove 405 to quickly converge to the drainage hole 406 and be discharged through the drainage channel 404. This prevents liquid from accumulating in the waterproof gap 403 and causing the bottom shell 100 to be soaked, reduces the risk of bottom shell 100 sealing failure caused by water accumulation, and ensures long-term stability of sealing performance.

[0051] The protective frame 600 is made of silicone protective pads.

[0052] The protective frame 600 is made of silicone protective pad material. Utilizing the excellent aging resistance, elasticity and corrosion resistance of silicone material, combined with the protective base 400 and the protective frame 600, it reduces the impact of friction or external vibration and compression on the bottom shell 100 in the mounting groove 401. This ensures that the bottom shell 100 can maintain a stable structure and reduces safety hazards such as leakage and short circuit of the battery cell assembly 700 inside the bottom shell 100 caused by compression or vibration. It further ensures the stable and reliable protection of the internal battery cell assembly 700 by the bottom shell 100.

[0053] Specifically, in this embodiment, the battery casing sealing structure is used as the casing of the energy storage battery. A cell assembly 700 can be provided in the receiving groove 102. The cell assembly 700 is electrically connected to the main control board and the circuit interface. One end of the casing cover 200 is provided with an end cover, and the circuit interface is exposed outside the end cover.

[0054] The specific operating principle in this embodiment is as follows:

[0055] The protective gap of the bottom shell 100 is matched with the protective frame 600, and the bottom of the bottom shell 100 is matched with the mounting groove 401 of the protective base 400, so that the connecting flange 104 of the bottom shell 100 is matched with the connecting part 402. A waterproof ring 500 is set between the connecting flange 104 and the connecting part 402 to ensure the connection between the bottom shell 100 and the protective base 400. The raised protective flange 101 formed by bending around the bottom shell 100 and the retaining flange 103 together form a double protection structure. Waterproof sealant is applied to the outer side of the retaining flange 103, and a sealing ring 300 is bonded to the connecting flange 104. The shell cover 200 is then placed through the receiving cavity 2. The 01 is inserted into the positioning part 105 of the bottom shell 100, so that the retaining edge 103 is engaged with the inner wall of the receiving cavity 201, which effectively enhances the connection strength between the bottom shell 100 and the shell cover 200, and ensures the continuous and stable clamping force of the joint sealing surface. At the same time, the shell cover 200 forms a retaining pair with the retaining edge 103 of the bottom shell 100 through the receiving cavity 201. The retaining edge 103 cooperates with the sealing ring 300 between the connecting edge 104 and the mounting edge 202 to form a multi-joint sealing connection structure, which enhances the sealing effect of the sealing joint, further prevents external impurities from entering the interior, and improves the sealing stability and long-term reliability of the battery shell.

[0056] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A battery casing sealing structure, comprising a bottom shell and a casing cover matingly disposed on the bottom shell, characterized in that: The bottom shell has raised protective edges formed by bending around its perimeter. The protective edges surrounding the bottom shell create a receiving groove inside the shell, with an opening at the top. The end of the protective edges away from the receiving groove is bent to form a retaining edge, which extends towards the bottom of the bottom shell. The end of the retaining edge away from the protective edges is bent to form a connecting edge for installation. A protective gap is formed between the protective edges and the retaining edge. A protective frame is fitted within the protective gap. The cover is box-shaped, and its interior has a receiving cavity that matches the receiving groove. The cover is fitted onto the bottom shell and covers the opening, allowing the cover to be engaged with the retaining edge through the receiving cavity. An installation edge is formed on the cover by bending to connect with the connecting edge. A sealing ring is provided between the connecting edge and the installation edge.

2. The battery casing sealing structure according to claim 1, characterized in that: The protective guard and the retaining guard form a raised positioning part, so that the cover can be inserted into the positioning part through the receiving cavity.

3. The battery casing sealing structure according to claim 2, characterized in that: The side of the retaining edge contacts the inner wall of the receiving cavity, and the outer side of the retaining edge is bonded and sealed to the inner wall of the receiving cavity with waterproof sealant.

4. The battery casing sealing structure according to claim 1, characterized in that: The retaining edge and the connecting edge extend in an "L" shape, so that the retaining edge protrudes into the receiving cavity of the cover and mates with the cover to form an isolation structure.

5. The battery casing sealing structure according to claim 1, characterized in that: The connecting baffle has multiple connecting holes, and the mounting baffle has mounting holes that are matched and connected to the connecting holes, so that the mounting baffle is connected to the connecting holes by bolts passing through the mounting holes.

6. The battery casing sealing structure according to claim 1, characterized in that: The bottom of the base shell is connected to a protective base. The protective base has a matching insertion groove for the base shell. The edge of the base has a connecting part, which matches the connecting edge of the base shell with the connecting part. A waterproof ring is provided between the connecting edge and the connecting part.

7. The battery casing sealing structure according to claim 6, characterized in that: The inner wall of the mounting groove and the outer side of the protective frame form a waterproof gap. A drainage channel is provided on the base. A drainage sloping groove is provided on the bottom wall of the mounting groove near the waterproof gap. A drainage hole is provided on the mounting groove that communicates with the waterproof gap and the drainage channel.

8. A battery casing sealing structure according to any one of claims 1-7, characterized in that: The protective frame is made of silicone protective pads.

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