Wheelchair power battery and waterproof structure and method thereof

Abstract

This invention discloses a power battery for wheelchairs and its waterproof structure and method, relating to the field of power battery technology. It includes an upper shell and a lower shell. A locking block is fixedly connected to the bottom of the upper shell, and a glue-applying groove is formed at the top of the lower shell. A thin film bladder is fixedly connected to the inner wall of the glue-applying groove. The thin film bladder is filled with waterproof glue, and an easy-tear film is provided on the side wall of the thin film bladder. A protective sleeve covers the side wall of the thin film bladder, and the protective sleeve is connected to the thin film bladder via the easy-tear film. A tear-off piece is fixedly connected to the side wall of the protective sleeve. This invention, by installing a structure including a thin film bladder, locking block, easy-tear film, and protective sleeve, achieves integrated assembly of the waterproof sealing process. It solves the problem of the strong dependence of traditional glue-applying processes on glue characteristics, environmental conditions, equipment parameters, and operational skills, avoiding the risks of glue breakage, air bubbles, or uneven glue quantity caused by process fluctuations, and improving production efficiency and the consistency of sealing quality.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, specifically to a power battery for wheelchairs and its waterproof structure and method. Background Technology

[0002] As an important mobility tool for people with mobility impairments, electric wheelchairs are now used in scenarios ranging from smooth indoor surfaces to complex outdoor terrain. The waterproof performance of their power batteries directly affects safety and lifespan. As high-voltage components, batteries are highly susceptible to damage if water enters due to a failure in the casing seal, which can easily lead to internal cell short circuits, BMS system malfunctions, or even thermal runaway and fire.

[0003] Waterproofing of battery casings largely relies on manual application of adhesive or sealing rings. Manual application of adhesive is prone to quality fluctuations such as uneven application, broken adhesive, and air bubbles, and is greatly affected by operator skill and temperature and humidity conditions; sealing rings are susceptible to aging, permanent deformation due to compression, or misalignment during assembly, leading to seal failure.

[0004] Patent CN210379188U discloses a battery structure for an electric wheelchair. The above patent achieves overall battery waterproofing, has a simple structure, reasonable design, is easy to manufacture, and has good waterproofing effect.

[0005] The aforementioned patent fills the space between the upper and lower shells with waterproof adhesive, which solves the problems of electric wheelchair batteries being unable to be waterproof, having low production efficiency, and poor safety and reliability. However, there is still room for improvement in how the waterproof adhesive is filled between the shells.

[0006] Therefore, this application proposes an integrated wheelchair power battery and its waterproof structure and method for achieving a waterproof sealing process. Summary of the Invention

[0007] The purpose of this invention is to provide a power battery for wheelchairs and its waterproof structure and method, in order to solve the technical problems mentioned in the background art, which rely on the stability of glue viscosity, ambient temperature and humidity, machine parameters and operator skills. Any fluctuation will lead to changes in glue output, path and speed, which may result in glue breakage, air bubbles or uneven glue output.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a waterproof structure for a wheelchair power battery, comprising an upper shell and a lower shell, wherein the upper shell is connected to the lower shell by fixing screws, a locking block is fixedly connected to the bottom of the upper shell, and a glue-applying groove is provided on the top of the lower shell, the locking block being embedded in the inner wall of the glue-applying groove, a thin film bladder being fixedly connected to the inclined surface of the inner wall of the glue-applying groove, the thin film bladder being filled with waterproof glue, the waterproof glue overflowing from the thin film bladder curing into a sealing colloid in the glue-applying groove, an easy-tear film being provided on the side wall of the thin film bladder, a protective sleeve being covered on the side wall of the thin film bladder, the protective sleeve being connected to the thin film bladder through the easy-tear film, and a tear strip being fixedly connected to the side wall of the protective sleeve.

[0009] Preferably, the sidewall of the membrane bladder is provided with multiple fragile membranes at equal intervals, and the inner wall of the glue-applying groove of the lower shell is provided with multiple grooves at equal intervals. The fragile membranes and the grooves are on the same vertical line. The sidewall of the card block is fixedly connected with a spike, and the groove is used to accommodate the spike.

[0010] Preferably, an elastic block is provided at the bottom of the inner wall of the glue application groove. The elastic block is fixedly installed on the inner wall of the lower housing. The top of the elastic block has a tree-like micro-groove with a main trunk and branches. The top surface of the elastic block has a V-shaped structure with a low middle and high sides. An arc-shaped bladder is fixedly connected to the side wall of the film bladder. A connecting piece is provided at the bottom of the arc-shaped bladder. The connecting piece is integrally connected with the protective sleeve. The arc-shaped bladder is fixed to the inner wall of the lower housing and is located at the corner of the glue application groove.

[0011] Preferably, two positioning cylinders of different heights are fixedly connected to the top of the inner wall of the upper housing, and two positioning rods of different heights are fixedly connected to the top of the inner wall of the lower housing. The positioning cylinder with the lower height on the upper housing is aligned with the positioning rod with the higher height on the lower housing, and the positioning cylinder with the higher height on the upper housing is aligned with the positioning rod with the lower height on the lower housing.

[0012] Preferably, a connecting shell is fixedly connected to the inner wall of the upper housing, and the waterproof adhesive inside the connecting shell seals the connection between the upper housing and the connecting line. A waterproof washer is provided between the fixing screw and the lower housing.

[0013] Preferably, the lower housing sidewall is provided with an inclined groove, which communicates with the glue application groove.

[0014] Preferably, the battery includes cylindrical cells. Twenty cylindrical cells are disposed inside the upper and lower housings. The cylindrical cells are fixedly installed between cell support one and cell support two. A nickel sheet one is fixedly connected to the top of cell support one, and a nickel sheet two is fixedly connected to the bottom of cell support two. A PC insulating sheet is attached to the side of the cylindrical cells, cell support one, and cell support two facing the lower housing. A BMS board is disposed on the side wall of the PC insulating sheet, and a connecting wire is connected to the BMS board, which passes through the upper housing.

[0015] Preferably, the outer wall of the upper housing is symmetrically provided with anti-foolproof grooves, the bottom of the lower housing is fixedly connected with a single-sided anti-foolproof slider, and the bottom of the lower housing is fixedly connected with a single-sided magnetic suction piece.

[0016] Preferably, the waterproofing method includes the following steps: S1. Before assembling the upper and lower shells, apply tearing force to the protective sleeve. The protective sleeve is then separated from the film bag along the easy-tear point of the film. S2. Move the card block down and insert it into the glue groove. The card block will drive the spiked block to gradually approach and contact the fragile film. The fragile film will break and the waterproof glue in the film bladder will overflow. S3. After the waterproof adhesive overflows from the membrane bladder, it flows into the micro-grooves of the elastic block, quickly filling the tiny gaps inside the micro-grooves. When the elastic block is deformed by the pressure of the card block, it spreads evenly to the contact interface between the elastic block, the card block, and the adhesive groove, forming a seamless waterproof sealing strip, which eventually cures into a sealing adhesive.

[0017] Preferably, step S1 further includes: S11, The protective sleeve drives the connecting piece, and the connecting piece separates from the arc-shaped bladder; Step S2 further includes: S21. Squeeze the card block into the arc-shaped bladder to make the waterproof adhesive inside the arc-shaped bladder overflow and spread the waterproof adhesive to the corner of the adhesive groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves integrated assembly of the waterproof sealing process by installing a membrane bladder, a locking block, an easy-tear membrane, and a protective sleeve structure. By pre-sealing the waterproof adhesive membrane bladder in the glue application groove of the lower shell, the original independent glue application operation, which required additional equipment and time, is transformed into an integrated step triggered synchronously with the shell closing action. This solves the problem of the traditional glue injection process being highly dependent on the characteristics of the glue, environmental conditions, equipment parameters, and operating skills, and avoids the risk of glue breakage, air bubbles, or uneven glue amount caused by process fluctuations, thereby improving production efficiency and the consistency of sealing quality. 2. This invention achieves directional and multi-point release of waterproof adhesive by installing a fragile membrane and a spiked structure. By equidistantly setting multiple fragile membranes on the side wall of the membrane bladder, during the shell closing process, the spikes on the clamping block puncture the corresponding fragile membranes, guiding the waterproof adhesive in the membrane bladder to overflow from multiple preset points. This solves the problem that when the membrane bladder is squeezed by the clamping block alone, the membrane bladder may not rupture evenly, resulting in random overflow and uneven release of waterproof adhesive. This improves the uniformity of waterproof sealing and avoids the formation of unfilled sealing dead corners in remote local areas due to insufficient flow distance or obstructed path of the adhesive, thereby eliminating potential weak points for water seepage. 3. This invention, through the installation of elastic blocks, arc-shaped bladders, and connecting pieces, achieves active guidance of adhesive in complex cavities and reinforced filling of dead corners. After the arc-shaped bladder is released from its constraints, it releases reinforcing adhesive, specifically targeting corner areas for secondary filling. This solves the problem in traditional processes where insufficient adhesive flow or obstructed paths make it difficult to fully fill the edges, low-lying areas, and complex corners of the adhesive application groove. It avoids weak sealing in corner and edge areas, and improves the integrity, uniformity, and structural adaptability of the waterproof seal. 4. This invention, by installing positioning rods and positioning cylinders of different heights, solves the risk of sealing failure and secondary contamination caused by misaligned assembly. When the shell attempts to force the cover closed due to incorrect orientation, the mismatched positioning rods will press against the inner wall of the positioning cylinder, preventing the shell from closing completely. The locking block cannot be embedded in the glue groove to squeeze the film bladder, preventing subsequent operations under incorrect conditions. This solves the problems that may be caused by misaligned closing, such as accidental squeezing of the film bladder, unexpected overflow of waterproof glue contaminating the internal circuit, and permanent structural damage or irreversible damage to the sealing surface caused by shell misalignment. It achieves forced error prevention in the assembly process, avoiding assembly errors such as 180-degree reverse installation or angular misalignment caused by operator negligence. Attached Figure Description

[0019] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a schematic diagram of the exploded structure of the present invention; Figure 3 This is a schematic diagram of the structure of the card block of the present invention when it is not inserted into the glue-applying groove; Figure 4 This is a schematic cross-sectional view of the membrane capsule structure of the present invention; Figure 5 This is a schematic diagram of the corner structure of the glue dispensing groove according to the present invention; Figure 6 This is a schematic diagram of the elastic block structure of the present invention; Figure 7 This is a schematic diagram of the vertical cross-sectional structure of the upper and lower shells of the present invention; Figure 8 This is a schematic diagram of the horizontal cross-sectional structure of the upper shell of the present invention.

[0020] In the diagram: 1. Upper shell; 2. Lower shell; 3. Anti-foolproof groove; 4. Connecting wire; 5. Cylindrical battery cell; 6. Battery cell bracket one; 7. Battery cell bracket two; 8. PC insulating sheet; 9. Nickel sheet one; 10. Nickel sheet two; 11. BMS board; 12. Single-sided anti-foolproof slider; 13. Fixing screw; 14. Waterproof washer; 15. Sealing colloid; 16. Glue application groove; 17. Locking block; 18. Slanted groove; 19. Single-sided magnetic suction piece; 20. Spike; 21. Membrane bladder; 22. Groove; 23. Elastic block; 24. Connecting shell; 25. Fragile membrane; 26. Protective sleeve; 27. Tear piece; 28. Easy-tear membrane; 29. ​​Arc-shaped bladder; 30. Connecting piece; 31. Micro-groove; 32. Positioning cylinder; 33. Positioning rod. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," 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 invention and for 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 invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4The present invention provides an embodiment of a waterproof structure for a wheelchair power battery, comprising an upper shell 1 and a lower shell 2. The upper shell 1 is connected to the lower shell 2 by a fixing screw 13. A locking block 17 is fixedly connected to the bottom of the upper shell 1. A glue-applying groove 16 is provided on the top of the lower shell 2. The locking block 17 is embedded in the inner wall of the glue-applying groove 16. A thin film bladder 21 is fixedly connected to the inclined surface of the inner wall of the glue-applying groove 16. The thin film bladder 21 is filled with waterproof glue. After the waterproof glue in the thin film bladder 21 overflows, it solidifies into a sealing glue 15 in the glue-applying groove 16. An easy-tear film 28 is provided on the side wall of the thin film bladder 21. A protective sleeve 26 is covered on the side wall of the thin film bladder 21. The protective sleeve 26 is connected to the thin film bladder 21 through the easy-tear film 28. A tear strip 27 is fixedly connected to the side wall of the protective sleeve 26.

[0025] Furthermore, before assembling the upper shell 1 and the lower shell 2, a tearing force is applied to the tearing blade 27, causing it to move away from the lower shell 2. The tearing blade 27 applies a pulling force to the protective sleeve 26, which in turn applies a pulling force to the easy-tear film 28. The easy-tear film 28 is a pre-designed weak structure with several tiny easy-tear cuts distributed on its surface, making it prone to breakage under stress. When the pulling force reaches a preset threshold, the easy-tear film 28 breaks along the cuts, separating the protective sleeve 26 from the film bladder 21, thereby releasing the protective sleeve 26 from the film bladder 21. At this point, the upper shell 1 and the lower shell 2 are aligned, and the locking block 17 of the upper shell 1 is embedded into the lower shell. Within the glue-applying groove 16, the locking block 17 compresses the membrane bladder 21, causing the waterproof adhesive inside to overflow and fill the gap between the glue-applying groove 16 and the locking block 17. Since the membrane bladder 21 is positioned on the inclined surface of the glue-applying groove 16, the overflowing waterproof adhesive flows naturally along the inclined surface, evenly covering the contact area between the inner wall of the glue-applying groove 16 and the locking block 17, fully filling the tiny gaps between them. After the waterproof adhesive cures, it forms a sealing colloid 15, which tightly adheres to the locking block 17 and the inner wall of the glue-applying groove 16, effectively sealing the gap at the connection between the housings and preventing external moisture from passing through the space between the upper housing 1 and the lower housing 2. The sealant 15 prevents external moisture from seeping into the battery through gaps, ensuring safe and stable battery operation. It blocks the path of external moisture into the battery through the connection between the upper and lower shells 1 and 2, significantly improving the waterproof sealing performance of the wheelchair power battery. The protective sleeve 26 and the film bladder 21 are made of polyvinyl chloride (PVC) with good flexibility and tear resistance, and silicone rubber with high elasticity and chemical resistance, respectively. The PVC material of the protective sleeve 26 can stably transfer force to the tear point 28 under tearing force, ensuring a smooth tearing process and minimizing debris generation. The silicone rubber material of the film bladder 21 has excellent extensibility and sealing properties, allowing it to effectively seal the battery. 7. The internal waterproof adhesive is evenly released during compression, preventing leakage of the adhesive when not in use. Furthermore, the protective sleeve 26 protects the membrane bladder 21 from damage caused by external scratches or compression during transportation, installation, and storage, preventing premature rupture and leakage of the waterproof adhesive due to external impact or accidental contact before the casing is assembled. After the power battery completes the pre-assembly preparations, the membrane bladder 21 can be quickly unwrapped by tearing the tear strip 27 on the protective sleeve 26, preparing for the subsequent sealing step of the clamping block 17 squeezing the membrane bladder 21 to release the waterproof adhesive. The upper casing 1 and lower casing 2 are then secured with fixing screws 13. By pre-installing a waterproof adhesive film capsule 21 within the glue dispensing tank 16, the problem of traditional glue dispensing relying on the stability of glue viscosity, ambient temperature and humidity, machine parameters, and operator skills is solved. Any fluctuation can lead to changes in glue dispensing volume, path, and speed, potentially causing glue breakage or uneven glue dispensing. The pre-installed film capsule 21 pre-encapsulates and shapes the waterproof adhesive, making the glue volume, position, and distribution standardized "component" attributes. This eliminates on-site process fluctuations and avoids cleaning and maintenance issues that may arise from using liquid adhesives on the production floor. It also eliminates the need for additional workstations and time for glue dispensing operations, including equipment movement, glue dispensing, and waiting for initial curing. As a standard part, the film capsule 21 can be quickly pre-installed and activated upon shell assembly, eliminating the need for separate glue dispensing processes and waiting time. This simplifies the assembly process, shortens the production cycle, and improves overall assembly efficiency.

[0026] Please see Figure 1 , Figure 3 and Figure 4 This invention provides an embodiment of a waterproof structure for a wheelchair power battery. A locking block 17 is fixedly connected to the bottom of the upper housing 1. A glue-applying groove 16 is opened at the top of the lower housing 2. The locking block 17 is embedded in the inner wall of the glue-applying groove 16. A thin film bladder 21 is fixedly connected to the inclined surface of the inner wall of the glue-applying groove 16. The thin film bladder 21 is filled with waterproof glue. After the waterproof glue overflows from the thin film bladder 21, it solidifies into a sealing colloid 15 within the glue-applying groove 16. The side wall of the thin film bladder 21 is provided with an easy-tear film 28. A protective sleeve 26 covers the side wall of the thin film bladder 21 and is connected to the thin film bladder 21 through the easy-tear film 28. A tear piece 27 is fixedly connected to the side wall of the protective sleeve 26. Multiple fragile films 25 are equidistantly arranged on the side wall of the thin film bladder 21. Multiple grooves 22 are equidistantly opened on the inclined surface of the inner wall of the glue-applying groove 16 of the lower housing 2. The fragile films 25 and the grooves 22 are on the same vertical line. A spike 20 is fixedly connected to the side wall of the locking block 17, and the grooves 22 are used to accommodate the spike 20.

[0027] Furthermore, during the assembly of the upper shell 1 and the lower shell 2, the protective sleeve 26 is torn off along the easy-tear film 28 by pulling the tearing tab 27, exposing the complete film bladder 21. When the upper shell 1 and the lower shell 2 are closed, the upper shell 1 or the lower shell 2 is moved, and the locking block 17 of the upper shell 1 is inserted into the glue-applying groove 16 of the lower shell 2. The barbs 20 on the side wall of the locking block 17 are aligned with the grooves 22 on the inclined surface of the inner wall of the glue-applying groove 16. As the closing action progresses, the locking block 17 gradually approaches and squeezes the film bladder 21, causing the film bladder 21 to gradually rupture. At the same time, the barbs 20 on the locking block 17 puncture the fragile film 25 at the corresponding position, allowing the waterproof glue inside the film bladder 21 to leak out through the ruptured fragile film. The waterproof adhesive overflows rapidly from position 25; the overflowing waterproof adhesive fills the gap between the applicator groove 16 and the locking block 17, including the space around the groove 22 and the spike 20. After the waterproof adhesive cures, the resulting sealant 15 tightly wraps the contact area between the locking block 17 and the applicator groove 16, achieving a reliable waterproof sealing effect. By equidistantly placing fragile membranes 25 on the membrane bladder 21, the membrane bladder 21 is prevented from breaking unevenly under the pressure of the locking block 17. This ensures that the waterproof adhesive can overflow evenly and rapidly along the breaks in the multiple fragile membranes 25 to all corners of the applicator groove 16, ensuring that all gaps between the applicator groove 16 and the locking block 17 are fully filled, avoiding any sealing issues. The design of the protective sleeve 26 effectively prevents premature breakage of the membrane bladder 21 and fragile membrane 25 due to accidental squeezing or collision during transportation and installation, ensuring effective retention and precise release of the waterproof adhesive. Its waterproof structure eliminates the need for additional manual adhesive application, simplifying the assembly process, improving production efficiency, and providing a stable and reliable seal. This allows it to adapt to the complex outdoor environments of wheelchairs, such as humid and dusty conditions, providing long-lasting waterproof protection for the power battery and ensuring its safe and stable operation. Furthermore, the inner wall of the membrane bladder 21 is also equidistantly equipped with corresponding dividing membrane structures, separating the waterproof adhesive within the membrane bladder 21 into multiple spaces to prevent the membrane bladder 21 from... The varying breakage times of the fragile membrane 25 cause concentrated overflow of waterproof adhesive in localized areas. This ensures that the waterproof adhesive in each compartment overflows from the corresponding breakage point of the fragile membrane 25, guaranteeing that all gaps between the adhesive groove 16 and the locking block 17 are evenly filled, effectively eliminating weak points in the seal. Simultaneously, the partition membrane structure enhances the internal structural stability of the membrane bladder 21, preventing uneven distribution of the waterproof adhesive due to its own weight or slight shaking when not under pressure. This allows for more precise and controllable adhesive release when the locking block 17 is pressed and triggers rupture, further improving the sealing reliability and consistency of the entire waterproof structure and avoiding uneven release of waterproof adhesive.

[0028] Please see Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6One embodiment of the present invention provides a waterproof structure for a wheelchair power battery. A locking block 17 is fixedly connected to the bottom of the upper housing 1, and a glue-applying groove 16 is formed at the top of the lower housing 2. The locking block 17 is embedded in the inner wall of the glue-applying groove 16. A thin film bladder 21 is fixedly connected to the inclined surface of the inner wall of the glue-applying groove 16. The thin film bladder 21 is filled with waterproof glue. After the waterproof glue overflows from the thin film bladder 21, it solidifies into a sealing glue 15 within the glue-applying groove 16. An easy-tear film 28 is provided on the side wall of the thin film bladder 21, and a protective sleeve 26 covers the side wall of the thin film bladder 21. The protective sleeve 26 is connected to the thin film through the easy-tear film 28. The protective sleeve 26 is fixedly connected to the side wall of the bladder 21 with a tear strip 27. An elastic block 23 is provided at the bottom of the inner wall of the glue application groove 16. The elastic block 23 is fixedly installed on the inner wall of the lower shell 2. The top of the elastic block 23 has a tree-shaped micro-groove 31 with a main trunk and branches. The top surface of the elastic block 23 has a V-shaped structure with a low middle and high sides. An arc-shaped bladder 29 is fixedly connected to the side wall of the film bladder 21. A connecting piece 30 is provided at the bottom of the arc-shaped bladder 29. The connecting piece 30 is integrally connected to the protective sleeve 26. The arc-shaped bladder 29 is fixed to the inner wall of the lower shell 2 and is located at the corner of the glue application groove 16.

[0029] Furthermore, by tearing the protective sleeve 26 with the tearing tab 27, the protective sleeve 26 is torn off from the film bladder 21. The protective sleeve 26 then drives the connecting piece 30, which is torn off from the arc-shaped bladder 29. The easily tearable film 28 on the film bladder 21 is exposed due to the loss of the protective sleeve 26's coverage. When the locking block 17 is embedded in the glue-applying groove 16 and pressed downwards, the film bladder 21 ruptures, and the waterproof adhesive inside overflows. Guided by the inclined surface of the glue-applying groove 16, the waterproof adhesive flows onto the elastic block 23. The V-shaped structure at the top of the elastic block 23 guides the thin waterproof adhesive... The adhesive flows along the tree-like microgrooves 31 to the edges and gaps of the application groove 16. Through capillary action, the waterproof adhesive is automatically drawn into the finer branch grooves on the microgrooves 31, thus quickly penetrating to the edges and corners of the application groove 16. The V-shaped structure at the top of the elastic block 23 guides the waterproof adhesive to diffuse towards the center, i.e., from the corners of the application groove 16 towards the center. Furthermore, as the locking block 17 presses against the elastic block 23, the waterproof adhesive within the microgrooves 31 is squeezed out, filling the gap between the application groove 16 and the locking block 17. The groove 31 guides the adhesive to spread rapidly, and then the elastic deformation of the elastic block 23 squeezes the adhesive out of the micro-grooves 31 of the elastic block 23, evenly filling all the tiny gaps between the card block 17 and the inner wall of the adhesive application groove 16; at the same time, the arc-shaped bladder 29 located at the corner of the adhesive application groove 16 loses the constraint of the connecting piece 30, and under the pressure of the card block 17, the reinforcing waterproof adhesive stored inside the arc-shaped bladder 29 flows out and merges with the waterproof adhesive that has previously diffused there, further filling the tiny gaps at the corner, and together filling the corners and edges of the adhesive application groove 16. At the corner, the waterproof adhesive is completely cured in the adhesive application groove 16 to form a sealing colloid 15, which effectively prevents external moisture from entering the power battery and ensures the stable operation of the battery in humid or water-filled environments. By setting an arc-shaped bladder 29 at the corner of the adhesive application groove 16, the problem of insufficient penetration and incomplete filling of the waterproof adhesive at the corner of the adhesive application groove 16 is avoided. This solves the pain point of easy sealing leakage at the corner in traditional waterproofing processes, ensuring the integrity and reliability of the power battery waterproof structure, thereby achieving efficient waterproof sealing of the power battery casing.

[0030] Please see Figure 1 , Figure 3 , Figure 4 , Figure 7 and Figure 8The present invention provides an embodiment of a waterproof structure for a wheelchair power battery, comprising an upper shell 1 and a lower shell 2. A locking block 17 is fixedly connected to the bottom of the upper shell 1. A glue-applying groove 16 is opened at the top of the lower shell 2. A thin film bladder 21 is fixedly connected to the inner wall of the glue-applying groove 16. Two positioning cylinders 32 of different heights are fixedly connected to the top of the inner wall of the upper shell 1. Two positioning rods 33 of different heights are fixedly connected to the top of the inner wall of the lower shell 2. The positioning cylinder 32 of the lower height on the upper shell 1 is aligned with the positioning rod 33 of the higher height on the lower shell 2. The positioning cylinder 32 of the higher height on the upper shell 1 is aligned with the positioning rod 33 of the lower height on the lower shell 2.

[0031] Furthermore, during the assembly of the upper housing 1 and the lower housing 2, the positioning cylinder 32 on the upper housing 1 is aligned with the corresponding positioning rod 33 on the lower housing 2, and the positioning rod 33 is inserted into the corresponding positioning cylinder 32. When the positioning rod 33 is not inserted into the corresponding positioning cylinder 32, that is, when the higher positioning cylinder 32 on the upper housing 1 is inserted into the higher positioning rod 33 on the lower housing 2, the positioning rod 33 abuts against the positioning cylinder 32, and the upper housing 1 and the lower housing 2 cannot be completely closed. There is a gap between the upper housing 1 and the lower housing 2, and the locking block 17 cannot be inserted into the glue-applying groove 16. Therefore, the membrane bladder 21 cannot be squeezed and ruptured by the locking block 17 to release the pre-stored sealant inside, thus causing an error during the installation of the upper housing 1 and the lower housing 2. The operator can promptly detect the assembly deviation and prevent misalignment. Forcibly closing the cover in this state could cause structural damage or seal failure, ensuring the assembly accuracy of the waterproof structure and the safety of the power battery. It also prevents waterproof adhesive from overflowing and adhering to the locking block 17, which could drip from the locking block 17 and contaminate the internal circuit components of the power battery, increasing the risk of short circuits. When the positioning rod 33 is accurately inserted into the corresponding positioning cylinder 32, the upper shell 1 and lower shell 2 can be completely closed. The locking block 17 smoothly embeds into the glue application groove 16 and squeezes the thin film bladder 21, allowing the waterproof adhesive to evenly fill the shell joints, forming a continuous and dense waterproof sealing layer that effectively prevents external moisture and dust from intruding. The matching of the positioning cylinder 32 and the positioning rod 33 achieves a foolproof assembly process, ensuring accuracy and consistency.

[0032] Please see Figure 1 , Figure 2 and Figure 3 The present invention provides an embodiment of a waterproof structure for a power battery for a wheelchair. A connecting shell 24 is fixedly connected to the inner wall of the upper shell 1. The waterproof adhesive in the connecting shell 24 seals the connection between the upper shell 1 and the connecting wire 4. A waterproof washer 14 is provided between the fixing screw 13 and the lower shell 2. A slanted groove 18 is provided on the side wall of the lower shell 2. The slanted groove 18 communicates with the glue application groove 16.

[0033] Furthermore, when the waterproof adhesive diffuses within the adhesive applicator 16, it connects the adhesive applicator 16 to the outside through the inclined groove 18. This allows air bubbles to flow with the waterproof adhesive within the adhesive applicator 16, moving to the position of the inclined groove 18 and being discharged to the outside along the inclined direction of the groove 18. This prevents air bubbles from remaining inside the adhesive applicator 16 and forming gaps. The inclined groove 18 extends from the position of the adhesive applicator 16 to the external outlet and is inclined upwards, meaning the external outlet is higher than the opening of the adhesive applicator 16. After the waterproof adhesive cures, it seals the inclined groove 18. The waterproof washer 14 between the fixing screw 13 and the lower housing 2 tightly fills the gap between the screw hole and the screw rod, preventing moisture from entering the battery through the screw thread gaps.

[0034] Please see Figure 1 , Figure 2 and Figure 8 An embodiment of the present invention provides a power battery for a wheelchair, comprising cylindrical cells 5. Twenty cylindrical cells 5 are disposed within an upper housing 1 and a lower housing 2. The cylindrical cells 5 are fixedly installed between a cell support 1 6 and a cell support 2 7. A nickel sheet 1 9 is fixedly connected to the top of the cell support 1 6, and a nickel sheet 2 10 is fixedly connected to the bottom of the cell support 2 7. A PC insulating sheet 8 is attached to the side of the cylindrical cells 5, cell support 1 6, and cell support 2 7 facing the lower housing 2. A BMS board 11 is disposed on the side wall of the PC insulating sheet 8. A connecting wire 4 is connected to the BMS board 11, and the connecting wire 4 passes through the upper housing 1. Anti-foolproof grooves 3 are symmetrically formed on the outer wall of the upper housing 1. A single-sided anti-foolproof slider 12 is fixedly connected to the bottom of the lower housing 2, and a single-sided magnetic absorbing sheet 19 is fixedly connected to the bottom of the lower housing 2.

[0035] Furthermore, the cell support 6 and the cell support 7 form a stable mechanical framework, ensuring that the 20 cylindrical cells 5 are arrayed and fixed in position inside the upper housing 1 and the lower housing 2, resisting vibration and impact. Nickel sheet 9 connects the positive terminals of all cylindrical cells 5 by resistance welding, and nickel sheet 10 at the bottom of cell support 7 connects the negative terminals of all cylindrical cells 5 by resistance welding. PC insulating sheet 8 prevents direct contact between the cylindrical cells 5, cell support 6, or nickel sheet 10 and the BMS board 11, thus avoiding the risk of short circuits and ensuring that the BMS board 11 establishes a reliable electrical connection with the cells only through the positive and negative nickel sheets. The connection ensures stable current transmission; when the connecting wire 4 led out from the BMS board 11 passes through the upper shell 1 and the connecting shell 24, the waterproof adhesive inside the connecting shell 24 achieves waterproof sealing through the waterproof adhesive layer inside the connecting shell 24, preventing external moisture from entering the internal circuit; the single-sided magnetic clasp 19 facilitates the quick positioning and fixing of the power battery in the designated position of the wheelchair, improving installation efficiency and stability; the anti-foolproof groove 3 of the upper shell 1 and the single-sided anti-foolproof slider 12 of the lower shell 2 effectively avoid directional errors during shell assembly, improve assembly efficiency, ensure that the battery is installed in the wheelchair in the only correct direction, and prevent electrical or mechanical damage caused by misinsertion.

[0036] Working principle: Before assembling the upper shell 1 and the lower shell 2, the tension applied to the tearing blade 27 causes the protective sleeve 26 to break along the easy-tear film 28 that connects it to the film bladder 21. The easy-tear film 28 is a pre-set weak structure, which peels the protective sleeve 26 off the film bladder 21 as a whole. During the shell assembly process, the locking block 17 of the upper shell 1 is aligned with the glue-applying groove 16 of the lower shell 2. The locking block 17 presses down on the exposed membrane bladder 21. Under the pressure, the membrane bladder 21 and the fragile membrane 25 rupture, and the waterproof glue pre-sealed inside the membrane bladder 21 is squeezed out. The overflowing waterproof glue flows into the gap between the glue-applying groove 16 and the locking block 17. Under the combined action of the inclined surface of the glue-applying groove 16, the capillary action of the micro-groove 31 on the elastic block 23, and the reinforcing glue released by the arc-shaped bladder 29 at the corner, the entire seam area is filled. The overflowing and filled waterproof adhesive is left to solidify in the gap between the adhesive groove 16 and the card block 17, forming a solid sealing adhesive 15 that tightly adheres to the upper shell 1 and the lower shell 2. The sealing adhesive 15 blocks the water seepage path at the connection between the upper shell 1 and the lower shell 2, effectively preventing external moisture, dust and other substances from entering the battery.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A waterproof structure for a wheelchair power battery, characterized in that: The device includes an upper shell (1) and a lower shell (2). The upper shell (1) is connected to the lower shell (2) by a fixing screw (13). A locking block (17) is fixedly connected to the bottom of the upper shell (1). A glue-applying groove (16) is opened on the top of the lower shell (2). The locking block (17) is embedded in the inner wall of the glue-applying groove (16). A film bladder (21) is fixedly connected to the inclined surface of the inner wall of the glue-applying groove (16). The film bladder (21) is filled with waterproof glue. After the waterproof glue in the film bladder (21) overflows, it solidifies into a sealing glue (15) in the glue-applying groove (16). The side wall of the film bladder (21) is provided with an easy-tear film (28). The side wall of the film bladder (21) is covered with a protective sleeve (26). The protective sleeve (26) is connected to the film bladder (21) through the easy-tear film (28). A tear piece (27) is fixedly connected to the side wall of the protective sleeve (26).

2. The waterproof structure of a wheelchair power battery according to claim 1, characterized in that: The sidewall of the membrane bag (21) is provided with multiple fragile membranes (25) at equal intervals. The inner wall of the glue groove (16) of the lower shell (2) is provided with multiple grooves (22) at equal intervals. The fragile membranes (25) and the grooves (22) are on the same vertical line. The sidewall of the card block (17) is fixedly connected with a spike (20). The groove (22) is used to accommodate the spike (20).

3. The waterproof structure of a wheelchair power battery according to claim 2, characterized in that: An elastic block (23) is provided at the bottom of the inner wall of the glue-applying groove (16). The elastic block (23) is fixedly installed on the inner wall of the lower shell (2). The top of the elastic block (23) is provided with a tree-shaped micro-groove (31) with a main trunk and branches. The top surface of the elastic block (23) is a V-shaped structure with a low middle and high sides. An arc-shaped bladder (29) is fixedly connected to the side wall of the film bladder (21). A connecting piece (30) is provided at the bottom of the arc-shaped bladder (29). The connecting piece (30) is integrally connected with the protective sleeve (26). The arc-shaped bladder (29) is fixed on the inner wall of the lower shell (2). The arc-shaped bladder (29) is located at the corner of the glue-applying groove (16).

4. The waterproof structure of a wheelchair power battery according to claim 1, characterized in that: The upper shell (1) has two positioning cylinders (32) of different heights fixedly connected to the top of its inner wall, and the lower shell (2) has two positioning rods (33) of different heights fixedly connected to the top of its inner wall. The positioning cylinder (32) of the upper shell (1) with the lower height is aligned with the positioning rod (33) of the lower shell (2), and the positioning cylinder (32) of the upper shell (1) with the positioning rod (33) of the lower height is aligned with the positioning rod (33) of the lower shell (2).

5. The waterproof structure of a wheelchair power battery according to claim 1, characterized in that: The inner wall of the upper housing (1) is fixedly connected to a connecting shell (24). The waterproof adhesive inside the connecting shell (24) seals the connection between the upper housing (1) and the connecting line (4). A waterproof washer (14) is provided between the fixing screw (13) and the lower housing (2).

6. The waterproof structure of a wheelchair power battery according to claim 1, characterized in that: The lower housing (2) has a slanted groove (18) on its side wall, which is connected to the glue-applying groove (16).

7. A power battery for a wheelchair, comprising a waterproof structure as described in any one of claims 1-6, characterized in that: It also includes cylindrical cells (5). Twenty cylindrical cells (5) are installed in the upper shell (1) and lower shell (2). The cylindrical cells (5) are fixedly installed between the first cell support (6) and the second cell support (7). The top of the first cell support (6) is fixedly connected to a nickel sheet (9), and the bottom of the second cell support (7) is fixedly connected to a nickel sheet (10). The cylindrical cells (5), the first cell support (6), and the second cell support (7) are attached with PC insulating sheets (8) on the side facing the lower shell (2). The side wall of the PC insulating sheet (8) is provided with a BMS board (11). A connecting wire (4) is connected to the BMS board (11), and the connecting wire (4) passes through the upper shell (1).

8. A power battery for a wheelchair according to claim 7, characterized in that: The upper shell (1) has symmetrical anti-foolproof grooves (3) on its outer wall, and the bottom of the lower shell (2) is fixedly connected to a single-sided anti-foolproof slider (12) and a single-sided magnetic suction piece (19).

9. A waterproofing method for a waterproof structure of a wheelchair power battery, applicable to the waterproof structure of a wheelchair power battery as described in any one of claims 1-6, characterized in that: The waterproofing method includes the following steps: S1. Before assembling the upper shell (1) and the lower shell (2), apply the tearing blade (27) to pull the protective sleeve (26) through the tearing blade (27), and the protective sleeve (26) separates from the film bag (21) along the easy-tear point film (28); S2. Move the card block (17) down and insert it into the glue-applying groove (16). The card block (17) drives the spike block (20) to gradually approach and contact the fragile film (25). The fragile film (25) breaks and the waterproof glue in the film bladder (21) overflows. S3. After the waterproof adhesive overflows from the film bladder (21), it flows into the micro groove (31) of the elastic block (23), quickly filling the tiny gaps inside the micro groove (31). When the elastic block (23) is deformed by the pressure of the card block (17), it spreads evenly to the contact interface between the elastic block (23), the card block (17), and the glue groove (16) to form a seamless waterproof sealing strip, which eventually solidifies into a sealing adhesive (15).

10. A waterproofing method for a waterproof structure of a wheelchair power battery according to claim 9, characterized in that: Step S1 further includes: S11, the protective sleeve (26) drives the connecting piece (30), and the connecting piece (30) separates from the arc-shaped bladder (29); Step S2 further includes: S21. Squeeze the card block (17) against the arc-shaped bladder (29) to make the waterproof glue inside the arc-shaped bladder (29) overflow and spread the waterproof glue to the corner of the glue groove (16).

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