A waterproof and dustproof structure for lithium batteries

Abstract

This utility model discloses a waterproof and dustproof structure for a lithium battery, including a lower cover and an upper cover. One side of the lower cover and the upper cover, respectively, has an integrally formed extension edge one and an extension edge two. A sealing strip one is sandwiched between the extension edges one and two. Fastening components for squeezing the sealing strip one penetrate the corners of the overlapping extension edges one and two. The fastening components are elastic near both ends. Compared with the prior art, the advantages of this utility model are that the concave-convex design of the sealing strip one, in conjunction with the concave-convex surfaces of the extension edges, increases the tortuosity of the sealing path, making it difficult for moisture or dust to directly penetrate; the adhesive layer on the sealing strip one is bonded to the extension edge, and the adhesive layer can maintain tight contact even under vibration or temperature changes, preventing gap formation; the fastening components provide constant compressive force, compensating for the loss of elasticity of the sealing strip and ensuring that the sealing strip is always tightly squeezed.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a waterproof and dustproof structure for lithium batteries. Background Technology

[0002] The sealing of lithium batteries in mobility scooters is usually not a single structure, but a multi-layered one. The core or electrode is encapsulated in aluminum-plastic film, aluminum shell or steel shell. These shells themselves have strong sealing properties. Then there is a battery cover plate on the outside for sealing. Although there are multiple layers of sealing, the outermost sealing structure is mainly used to block moisture and dust.

[0003] In practical applications, lithium battery covers are typically sealed with sealing strips, and bolts are used to press the cover and the sealing strip together. During the continuous, multi-dimensional vibrations of a scooter, the sealing strip is under constant compression. Under continuous pressure and temperature changes, the strip gradually loses its elasticity, undergoing "permanent compression deformation." This weakens its resilience, preventing it from tightly filling gaps, and vibration accelerates this process. The resulting sealant failure creates gaps, allowing external moisture and dust to penetrate, affecting the lifespan of the lithium battery. Utility Model Content

[0004] In view of the above-mentioned problems, the technical problem to be solved by this utility model is to provide a waterproof and dustproof structure for lithium batteries.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a waterproof and dustproof structure for lithium batteries, including a lower cover and an upper cover. The lower cover and the upper cover are respectively integrally provided with an extension edge one and an extension edge two on one side of their mutual cooperation. A sealing strip one is sandwiched between the extension edge one and the extension edge two. Fastening components for squeezing the sealing strip one are passed through the corners of the overlapping extension edge one and the extension edge two. The fastening components are elastic near both ends, and respectively squeeze the extension edge one and the extension edge two toward the sealing strip one.

[0006] A further preferred embodiment of this utility model is: both the first extension edge and the second extension edge are horizontally arranged, and the sides of the first extension edge and the second extension edge that are close to each other are concave and convex.

[0007] The sealing strip is also convex and concave on both the top and bottom surfaces, which match the convex and concave surfaces of extension edge one and extension edge two.

[0008] A further preferred embodiment of this utility model is: the sealing strip has an adhesive layer on both its upper and lower surfaces, which are respectively bonded to the surfaces of the extension edge one and the extension edge two that are close to each other.

[0009] A further preferred embodiment of this utility model is: the fastening component includes a threaded rod, one end of which has a fixed end with a diameter larger than that of the threaded rod, and the other end passes through an extension side one and an extension side two, with a nut threadedly connected to the end through which it passes.

[0010] The threaded rod is fitted with two sets of elastic elements located on the outer sides of extension side one and extension side two, respectively. The outer ends of the two sets of elastic elements abut against the fixed end and the nut, respectively, and the inner ends of each set of elastic elements have a layer of gaskets. The two sets of gaskets abut against extension side one and extension side two, respectively.

[0011] A further preferred embodiment of this utility model is: an extended outer frame layer 1 is integrally formed on the outer side of the first extension edge, and an extended outer frame layer 2 is integrally formed on the outer side of the second extension edge, the second outer frame layer is located inside the first outer frame layer, and a sealing strip 2 is provided between the first outer frame layer and the second outer frame layer.

[0012] A further preferred embodiment of this utility model is: the second sealing strip includes two sealing rings and a film layer between the two sealing rings, the film layer being integrally formed with the two sealing rings;

[0013] The outer frame layer 1 and outer frame layer 2 are provided with installation channels on their adjacent sides. The two installation channels are distributed one above the other. The two sealing rings are squeezed and clamped between the outer frame layer 1 and outer frame layer 2, and are located in the two installation channels respectively. When the outer frame layer 1 and outer frame layer 2 slide in the up and down direction, the two sealing rings move and stretch or compress the film layer.

[0014] A further preferred embodiment of this utility model is: a layer of lubricating oil is coated on the side of the outer frame layer one and the outer frame layer two that are close to each other.

[0015] A further preferred embodiment of this utility model is: the mounting channel is arc-shaped, the cross-section of the sealing ring is circular, the sealing ring is pressed and fitted against the inner wall of the mounting channel, and the portion of the sealing ring located on the outer side of the mounting channel is compressed.

[0016] A further preferred embodiment of this utility model is: the film layer is in the form of a thin film, and its material is rubber.

[0017] A further preferred embodiment of this utility model is: the outer frame layer one, the outer frame layer two, the sealing ring and the film layer are all arranged in a circle around the lower cover and the upper cover.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] 1. The concave-convex design of the sealing strip and the concave-convex surface of the extension edge increase the tortuosity of the sealing path, making it difficult for moisture or dust to penetrate directly; the adhesive layer on the sealing strip adheres to the extension edge, and the adhesive layer can maintain close contact even when there is vibration or temperature change, preventing gap formation; the fastening components provide constant compressive force to compensate for the loss of elasticity of the sealing strip and ensure that the sealing strip is always tightly compressed.

[0020] 2. The sealing strip between the outer frame layer one and the outer frame layer two is allowed to move up and down relative to each other. The sealing ring is fixed in the installation channel. The sliding side of the sealing ring generates low friction movement, while the fixed side maintains high sealing performance. Moving water vapor or dust must pass through the side with high sealing performance, effectively preventing water vapor and dust from penetrating downward. Attached Figure Description

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be regarded as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is an exploded structural diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the half-section structure of this utility model;

[0025] Figure 4 This utility model Figure 3 A magnified schematic diagram of the structure of part A in the diagram;

[0026] Figure 5 This is a schematic diagram of the fastening component structure of this utility model;

[0027] Figure 6 This is a partial structural diagram of the sealing strip of this utility model.

[0028] In the diagram: 1. Lower cover; 11. Extension edge one; 12. Outer frame layer one; 2. Upper cover; 21. Extension edge two; 22. Outer frame layer two; 3. Sealing strip one; 4. Sealing strip two; 41. Sealing ring; 42. Membrane layer; 43. Mounting channel; 5. Fastening components; 51. Threaded rod; 52. Fixed end; 53. Nut; 54. Gasket; 55. Elastic component. Detailed Implementation

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0030] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0031] This embodiment mainly describes a waterproof and dustproof structure for lithium batteries. Please refer to [link / reference]. Figures 1-6 Specifically, the sealing of lithium battery covers is generally achieved through sealing strips. However, the sealing effect of a single strip is limited. Furthermore, the sealing strip is under constant compression, and under continuous pressure and temperature changes, its elasticity gradually diminishes. Since the bolt tightening remains unchanged, the sealing strip can no longer tightly fill the gaps, leading to a degree of sealing failure. Based on this, a waterproof and dustproof structure for lithium batteries is proposed, such as... Figures 1-4 The diagram shows a sealing strip 3 sealing the lower cover 1 and the upper cover 2. The lower cover 1 and the upper cover 2 are respectively provided with an extension edge 11 and an extension edge 21 on one side of the lower cover 1 and the upper cover 2. The sealing strip 3 is sandwiched between the extension edges 11 and 21. Fastening members 5 for squeezing the sealing strip 3 are passed through the corners of the overlapping extension edges 11 and 21. The fastening members 5 are elastic near both ends, squeezing the extension edges 11 and 21 toward the sealing strip 3.

[0032] Specifically, the mating surfaces of the lower cover 1 and the upper cover 2 are respectively extended with an extension edge 11 and an extension edge 21. The extension edge 11 and the extension edge 21 are used to increase the mating area and path. The sealing strip 3 is clamped between the extension edge 11 and the extension edge 21. The fastening component 5 pushes the extension edge 11 and the extension edge 21, so that the sealing strip 3 is squeezed. It should be noted that when the fastening component 5 pushes the extension edge 11 and the extension edge 21, it maintains a certain pushing force. Even if the sealing strip 3 is deformed, it is still squeezed to avoid the formation of gaps.

[0033] like Figure 4 The specific shapes of extension edge 11, extension edge 21 and sealing strip 3 are shown. Extension edge 11 and extension edge 21 are both horizontally set, and the sides of extension edge 11 and extension edge 21 that are close to each other are concave and convex.

[0034] The sealing strip 3 is also concave and convex on both the top and bottom surfaces, which match the concave and convex surfaces of the extension edge 11 and the extension edge 21.

[0035] Specifically, the concave-convex fit of the extension edge 11, extension edge 21, and sealing strip 3 is used to increase the sealing path, making it less likely for moisture or dust to seep in.

[0036] The sealing strip 3 has an adhesive layer on both its top and bottom surfaces, which is bonded to the surfaces of the extension edge 11 and extension edge 21 respectively. In addition to exerting a squeezing effect on the sealing strip 3, the adhesive layer also achieves adhesion to the extension edge 11 and extension edge 21, further improving the sealing effect.

[0037] like Figure 5 The fastening component 5 is shown in the figure. The fastening component 5 includes a threaded rod 51. One end of the threaded rod 51 has a fixed end 52 with a diameter larger than that of the threaded rod 51. The other end passes through the extension side 11 and the extension side 21. The end through which it passes is threadedly connected to a nut 53.

[0038] The threaded rod 51 is fitted with two sets of elastic elements 55 located on the outer side of the first extension side 11 and the second extension side 21, respectively. The outer ends of the two sets of elastic elements 55 abut against the fixed end 52 and the nut 53, respectively, and the inner ends of each set of elastic elements 55 have a layer of gasket 54. The two sets of gaskets 54 abut against the first extension side 11 and the second extension side 21, respectively.

[0039] Specifically, the threaded rod 51 of the fastening component 5 passes through the first extension side 11 and the second extension side 21, keeping the first extension side 11 and the second extension side 21 in an overlapping state. At the same time, the two ends of the threaded rod 51 are the fixed end 52 and the nut 53, respectively. The nut 53 can be adjusted. The elastic element 55 is a spring. The fixed end 52 and the nut 53 support the spring, and the spring is in a compressed state. The springs on the upper and lower sides push the first extension side 11 and the second extension side 21 respectively.

[0040] like Figure 4 and Figure 6 As shown, an extended outer frame layer 12 extends longitudinally on the outer side of the extended edge 11, and an extended outer frame layer 22 extends longitudinally on the outer side of the extended edge 21. The outer frame layer 22 is located inside the outer frame layer 12, and a sealing strip 4 is provided between the outer frame layer 12 and the outer frame layer 22.

[0041] Specifically, if a gap is generated between the lower cover 1 and the upper cover 2 due to vibration, further sealing is required. A sealing strip 2 4 is provided between the outer frame layer 12 and the outer frame layer 22. Even if the lower cover 1 and the upper cover 2 vibrate, the outer frame layer 12 and the outer frame layer 22 extend longitudinally, and the distance between them remains unchanged. The sealing strip 2 4 is clamped between the outer frame layer 12 and the outer frame layer 22 to maintain a seal.

[0042] like Figure 4 and Figure 6 As shown, the sealing strip 4 includes two sealing rings 41 and a membrane layer 42 between the two sealing rings 41. The membrane layer 42 is integrally formed with the two sealing rings 41.

[0043] The outer frame layer 12 and the outer frame layer 22 are respectively provided with installation channels 43 on their adjacent sides. The two installation channels 43 are distributed one above the other. The two sealing rings 41 are squeezed and clamped between the outer frame layer 12 and the outer frame layer 22, and are respectively located in the two installation channels 43. When the outer frame layer 12 and the outer frame layer 22 slide in the up and down direction, the two sealing rings 41 move with it and stretch or compress the film layer 42.

[0044] Specifically, each of the mounting channels 43 on the outer frame layer 12 and the outer frame layer 22 has a sealing ring 41. The two sealing rings 41 are connected by a membrane layer 42. It should be noted that when the outer frame layer 12 and the outer frame layer 22 move up and down, the two sealing rings 41 are respectively engaged in their respective mounting channels 43. As the outer frame layer 12 or the outer frame layer 22 moves, the outward side slides against the opposite outer frame layer 12 or the outer frame layer 22. The sliding side has a poor sealing effect, while the side engaged in the mounting channel 43 has a good sealing effect. When water vapor or dust moves downward from between the outer frame layer 12 and the outer frame layer 22, it must pass through the position where the sealing ring 41 and the mounting channel 43 cooperate to achieve a better sealing effect. It should be noted that the two sealing rings 41 are in a compressed state between the outer frame layer 12 and the outer frame layer 22.

[0045] The outer frame layer 12 and the outer frame layer 22 are coated with a layer of lubricating oil. The space between the outer frame layer 12 and the outer frame layer 22 can be filled with a portion of the lubricating oil to achieve a lubricating effect, reduce the wear of the two sealing rings 41, and reduce their aging rate.

[0046] like Figure 6 The diagram shows the specific installation structure of the sealing strip 4. The installation channel 43 is arc-shaped, and the sealing ring 41 has a circular cross-section. The sealing ring 41 is pressed and adhered to the inner wall of the installation channel 43, and the part of the sealing ring 41 located on the outside of the installation channel 43 is compressed.

[0047] Specifically, the sealing ring 41 is fitted into the installation channel 43 on one side and is pressed by the plane on the other side. The sealing ring 41 can move with the installation channel 43 and slide with the side pressed by the plane.

[0048] The membrane 42 is thin and made of rubber, which serves as a separator and allows the two sealing rings 41 to move closer or further apart.

[0049] The outer frame layer 12, outer frame layer 22, sealing ring 41 and membrane layer 42 are all arranged in a circle around the lower cover 1 and the upper cover 2, sealing the lower cover 1 and the upper cover 2 in one circumference.

[0050] Working principle: The outermost layer of the lithium battery consists of a lower cover 1 and an upper cover 2, which cooperate with each other. The outer sides of the lower cover 1 and the upper cover 2 are respectively provided with a horizontally extending extension edge 11 and an extension edge 21. A sealing strip 3 is sandwiched between the extension edge 11 and the extension edge 21. The fastening component 5 compresses the extension edge 11 and the extension edge 21 against the sealing strip 3 to achieve a sealing effect. It should be noted that the sealing strip 3 has an adhesive layer on both the upper and lower surfaces, which is bonded to the extension edge 11 and the extension edge 21. Even if the lithium battery vibrates under the action of the vehicle, the adhesive effect keeps the extension edge 11 and the extension edge 21 sealed with the sealing strip 3. Vibration causes the distance between the extension edge 11 and the extension edge 21 to change, while the adhesive layer keeps the sealing strip 3 connected to the extension edge 11 and the extension edge 21. The thickness of the sealing strip 3 automatically changes under tension or pressure.

[0051] It should also be noted that when the fastening component 5 is fastened, the elastic element 55 is compressed to keep the extension edge 11 and extension edge 21 in a compressed state. When the lithium battery is stationary, even if the sealing strip 3 ages or loses its elasticity, the extension edge 11 and extension edge 21 will still keep the sealing strip 3 compressed.

[0052] Secondly, the concave and convex design of the sealing strip 3, in conjunction with the concave and convex surfaces of the extension edge 11 and the extension edge 21, is used to increase the path of bending and extending of the sealing surface, thereby improving the sealing effect.

[0053] When the mobility scooter is ridden, vibrations occur. Since the lower cover 1 and upper cover 2 are not completely fixed, they will move upwards or downwards to a certain extent, causing changes in the gap between the first extension edge 11 and the second extension edge 21. Through the outer frame layer 12 and the second outer frame layer 22, and the sealing strip 4 between them, even if the outer frame layer 12 or the second outer frame layer 22 slides vertically, the two sealing rings 41 respectively engage with the mounting channels 43 on the outer frame layer 12 and the second outer frame layer 22, allowing the two sealing rings 41 to move with the outer frame layer 12 and the second outer frame layer 22. The two sealing rings 41 are located within the mounting channels 43. The outer part of the membrane 42 is fixed and slides against the outer frame layer 12 or outer frame layer 22. The membrane layer 42 is used to connect the two sealing rings 41. The part of the two sealing rings 41 located in the installation channel 43 is fixed, which makes the sealing effect better. The sealing performance of the sliding side is poor. When water vapor or dust moves from top to bottom between outer frame layer 12 and outer frame layer 22, it must pass through the side of the sealing ring 41 located in the installation channel 43 to further achieve the sealing effect. It should be noted that some lubricating oil can be poured between outer frame layer 12 and outer frame layer 22 to lubricate sealing strip 3 and sealing strip 4, and also to reduce the friction of sealing strip 4 and slow down the aging rate.

[0054] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model 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 utility model.

[0055] The above provides a detailed description of a waterproof and dustproof lithium battery structure. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand this utility model and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A waterproof and dustproof structure for a lithium battery, comprising a lower cover and an upper cover, wherein one side of the lower cover and the upper cover that cooperate with each other is integrally provided with an extension edge one and an extension edge two, and a sealing strip is sandwiched between the extension edge one and the extension edge two, characterized in that, Fastening components for squeezing the sealing strip are inserted through the corners of the overlapping extension edge one and extension edge two. The fastening components are elastic near both ends, squeezing the extension edge one and extension edge two toward the sealing strip one respectively.

2. The lithium battery waterproof and dustproof structure according to claim 1, characterized in that, Both extension edge one and extension edge two are horizontally set, and the sides of extension edge one and extension edge two that are close to each other are concave and convex. The sealing strip is also convex and concave on both the top and bottom surfaces, which match the convex and concave surfaces of extension edge one and extension edge two.

3. The lithium battery waterproof and dustproof structure according to claim 1, characterized in that, The sealing strip has an adhesive layer on both its top and bottom surfaces, which are bonded to the surfaces of extension edge one and extension edge two that are close to each other.

4. The lithium battery waterproof and dustproof structure according to claim 1, characterized in that, The fastening component includes a threaded rod, one end of which has a fixed end with a diameter larger than that of the threaded rod, and the other end passes through extension side one and extension side two, with a nut threadedly connected to the end through which it passes. The threaded rod is fitted with two sets of elastic elements located on the outer sides of extension side one and extension side two, respectively. The outer ends of the two sets of elastic elements abut against the fixed end and the nut, respectively, and the inner ends of each set of elastic elements have a layer of gaskets. The two sets of gaskets abut against extension side one and extension side two, respectively.

5. The lithium battery waterproof and dustproof structure according to claim 1, characterized in that, An extended edge one has a longitudinally extending outer frame layer one on its outer side, and an extended edge two has a longitudinally extending outer frame layer two on its outer side. The outer frame layer two is located inside the outer frame layer one, and a sealing strip two is provided between the outer frame layer one and the outer frame layer two.

6. The lithium battery waterproof and dustproof structure according to claim 5, characterized in that, The second sealing strip includes two sealing rings and a membrane layer between the two sealing rings, with the membrane layer integrally formed with the two sealing rings; The outer frame layer 1 and outer frame layer 2 are provided with installation channels on their adjacent sides. The two installation channels are distributed one above the other. The two sealing rings are squeezed and clamped between the outer frame layer 1 and outer frame layer 2, and are located in the two installation channels respectively. When the outer frame layer 1 and outer frame layer 2 slide in the up and down direction, the two sealing rings move and stretch or compress the film layer.

7. The lithium battery waterproof and dustproof structure according to claim 6, characterized in that, The adjacent sides of the first and second outer frame layers are coated with a layer of lubricating oil.

8. The lithium battery waterproof and dustproof structure according to claim 6, characterized in that, The mounting channel is arc-shaped, and the sealing ring has a circular cross-section. The sealing ring is pressed and fitted against the inner wall of the mounting channel, and the part of the sealing ring located on the outer side of the mounting channel is compressed.

9. The lithium battery waterproof and dustproof structure according to claim 6, characterized in that, It is a thin film made of rubber.

10. The lithium battery waterproof and dustproof structure according to claim 6, characterized in that, The outer frame layer one, outer frame layer two, sealing ring and membrane layer are all arranged in a ring around the lower cover and the upper cover.

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