Waterproof breathable cap and columnar battery

Abstract

The waterproof breathable cap comprises a bottom cap assembly and an upper cap assembly, the bottom cap assembly comprises a bottom piece and a waterproof breathable layer, the waterproof breathable layer is arranged on the bottom piece, a plurality of bottom breathable holes are formed in the bottom piece, and each bottom breathable hole is used for being communicated with an inner cavity of the battery; the upper cover assembly comprises a top piece, a pressure release valve block and a middle ventilation piece, the pressure release valve block is arranged on the top piece, the middle ventilation piece is arranged between the top piece and the bottom piece, a middle ventilation hole is formed in the middle ventilation piece, and a plurality of top ventilation holes are formed in the top piece; and gas in the inner cavity of the battery can be exhausted through the bottom air hole, the waterproof air-permeable layer, the middle air hole, the pressure release valve block and the top air hole. The utility model provides the waterproof and breathable cap and the columnar battery, on one hand, the exhaust problem of the water-based columnar battery can be solved, on the other hand, the electrolyte can be locked and prevented from being volatilized, finally, the gas production problem of the side reaction of the water-based battery is solved, and the service life of the battery is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery structure field, especially a waterproof and breathable type cap and cylindrical battery. BACKGROUND

[0002] In the aqueous zinc ion battery, due to the existence of water, hydrogen evolution reaction or oxygen evolution reaction will be accompanied in the process of charging and discharging. A large amount of gas produced by the side reaction will destroy the interface contact of the battery and affect the coulomb efficiency of the battery. When the side reaction is serious, the swelling deformation problem will shorten the service life of the battery. The commonly used cylindrical battery such as 18650, 21700 etc. has the problem of not being able to exhaust. The cap of this kind of battery is a full sealing structure, so its structure is not suitable for aqueous battery. SUMMARY

[0003] The utility model discloses a waterproof and breathable type cap and cylindrical battery, which can solve the exhaust problem of aqueous cylindrical battery, lock the electrolyte to prevent electrolyte evaporation, solve the gas production problem of aqueous battery side reaction, and greatly improve the service life of the battery.

[0004] The utility model discloses a waterproof and breathable type cap and cylindrical battery, which can solve the exhaust problem of aqueous cylindrical battery, lock the electrolyte to prevent electrolyte evaporation, solve the gas production problem of aqueous battery side reaction, and greatly improve the service life of the battery.

[0005] A waterproof and breathable type cap comprises:

[0006] A bottom cover assembly comprises a bottom sheet and a waterproof and breathable layer, the waterproof and breathable layer is arranged on the bottom sheet, a plurality of bottom gas permeation holes are formed in the bottom sheet, and each bottom gas permeation hole is used for communicating with a battery inner cavity.

[0007] An upper cover assembly comprises a top sheet, a pressure relief valve block and an intermediate gas permeation sheet, the pressure relief valve block is arranged on the top sheet, the intermediate gas permeation sheet is arranged between the top sheet and the bottom sheet, an intermediate gas permeation hole is formed in the intermediate gas permeation sheet, the top sheet is provided with a plurality of top gas permeation holes, and the gas in the battery inner cavity can be discharged through the bottom gas permeation hole, the waterproof and breathable layer, the intermediate gas permeation hole, the pressure relief valve block and the top gas permeation hole.

[0008] In one of the embodiments, a sealing ring is further included, the sealing ring is used for being installed on a battery shell, and the sealing ring wraps the bottom sheet and the top sheet.

[0009] In one of the embodiments, the bottom sheet is inwardly recessed to form an inwardly recessed mounting groove, the bottom cover assembly further comprises a rubber gasket, the rubber gasket is arranged in the inwardly recessed mounting groove, and the waterproof and breathable layer is arranged on the rubber gasket.

[0010] In one of the embodiments, the bottom of the inner recessed mounting groove is recessed inwardly to form a secondary recessed groove, and a middle air vent and a plurality of bottom air vents are formed on the secondary recessed groove, and the middle air vent and the bottom air vents are used for communicating with the battery inner cavity.

[0011] In one of the embodiments, the middle air vent piece comprises an outer edge portion and a middle protruding portion, the outer edge portion and the middle protruding portion are integrally formed, the middle protruding portion is provided protruding from the outer edge portion, and the middle protruding portion presses the waterproof air permeable layer downwardly into the secondary recessed groove of the bottom sheet, so that the gas in the battery inner cavity can be discharged through the bottom air vents, the waterproof air permeable layer, and the middle air vent.

[0012] In one of the embodiments, the connection between the outer edge portion and the middle protruding portion has a step structure, and the pressure relief valve block is arranged on the step structure.

[0013] The top sheet comprises an edge portion and an outer protruding portion, and the outer protruding portion is arranged on the edge portion.

[0014] The pressure relief valve block comprises a positioning plate and a top holding protruding portion, the top holding protruding portion is arranged on the positioning plate, the positioning plate is clamped between the top sheet and the step structure of the middle protruding portion, and the top holding protruding portion abuts against the outer protruding portion of the top sheet.

[0015] In one of the embodiments, a plurality of top air vents are formed on the outer protruding portion of the top sheet, the top holding protruding portion of the pressure relief valve block and the outer protruding portion of the top sheet have an air permeable ring cavity, each of the top air vents communicates with the air permeable ring cavity, and the gas in the battery inner cavity can be discharged through the bottom air vents, the waterproof air permeable layer, the middle air vent, the air permeable ring cavity, and the top air vents.

[0016] In one of the embodiments, after the middle protruding portion presses the waterproof air permeable layer downwardly into the secondary recessed groove, a waterproof air permeable area is formed between the waterproof air permeable layer and the bottom sheet, and the waterproof air permeable area communicates with each of the bottom air vents.

[0017] In one of the embodiments, a secondary waterproof sheet is further arranged between the pressure relief valve block and the middle air vent piece.

[0018] The utility model also provides a cylindrical battery, comprising the waterproof air permeable type cap as described above, and further comprising a shell, wherein the shell wraps the waterproof air permeable type cap.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0020] The utility model discloses a waterproof and breathable type cap and cylindrical battery, through setting up intermediate air -permeable piece and pressure -relief valve block, can realize the exhaust of battery, and through setting up waterproof and breathable layer can lock up the water in electrolyte, prevent water evaporation and cause battery life greatly shorten. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is waterproof and breathable type cap's structure schematic diagram of an embodiment of the utility model;

[0022] Figure 2 It is the structure schematic diagram of cylindrical battery of an embodiment of the utility model;

[0023] Figure 3 It is Figure 2 The structure schematic diagram of cylindrical battery of another angle shown in figure;

[0024] Figure 4 It is the sectional view of cylindrical battery of an embodiment of the utility model;

[0025] Figure 5 It is the sectional view of waterproof and breathable type cap and cylindrical battery of an embodiment of the utility model;

[0026] The reference signs of various components in the drawings are as follows:

[0027] 10, bottom cover assembly;11, bottom sheet;111, bottom air -permeable hole;112, recessed mounting groove;113, secondary recessed groove;114, middle air -permeable hole;12, waterproof and breathable layer;13, rubber gasket;20, upper cover assembly;21, top sheet;211, top air -permeable hole;212, edge portion;213, outer convex portion;22, pressure -relief valve block;221, positioning plate;222, top holding convex portion;223, air -permeable ring cavity;224, waterproof and breathable area;225, step structure;23, intermediate air -permeable piece;231, outer edge portion;232, intermediate convex portion;233, intermediate air -permeable hole;30, sealing ring;40, shell. DETAILED DESCRIPTION

[0028] In order to facilitate understanding the utility model, below will be more comprehensive description to the utility model with reference to relevant drawings. The preferred embodiments of the utility model are given in the drawings. However, the utility model can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0029] Please refer to Figures 1-5A waterproof and breathable cap, comprising: a bottom cover assembly 10 and an upper cover assembly 20, the bottom cover assembly 10 comprising a bottom sheet 11 and a waterproof and breathable layer 12, the waterproof and breathable layer 12 being arranged on the bottom sheet 11, the bottom sheet 11 being provided with a plurality of bottom gas permeable holes 111, each of the bottom gas permeable holes 111 being used for communication with the battery inner cavity; it should be noted that the bottom sheet 11 serves as the basic structure of the bottom cover assembly 10, and the bottom sheet 11 not only provides sufficient strength and stability, but also provides a channel for the gas exchange between the battery inner cavity and the outside world by opening the bottom gas permeable holes 111. The waterproof and breathable layer 12 can effectively prevent water from entering and allow gas to pass freely. This feature enables the battery to maintain its sealing while allowing normal gas exchange, thereby prolonging the service life of the battery.

[0030] Please refer to Figure 1 The upper cover assembly 20 comprises a top sheet 21, a pressure relief valve block 22 and an intermediate gas permeable sheet 23, the pressure relief valve block 22 being arranged on the top sheet 21, the intermediate gas permeable sheet 23 being arranged between the top sheet 21 and the bottom sheet 11, the intermediate gas permeable sheet 23 being provided with intermediate gas permeable holes 233, and the top sheet 21 being provided with a plurality of top gas permeable holes 211, so that the gas in the battery inner cavity can be discharged through the bottom gas permeable holes 111, the waterproof and breathable layer 12, the intermediate gas permeable holes 233, the pressure relief valve block 22 and the top gas permeable holes 211. It should be noted that the intermediate gas permeable sheet 23 further enhances the gas discharge capacity of the cap, and is located between the top sheet 21 and the bottom sheet 11, and provides a more smooth flow channel for the gas by opening the intermediate gas permeable holes 233. The top sheet 21 serves as the uppermost structure of the upper cover assembly 20, and not only provides additional protection, but also realizes the timely discharge of the battery internal gas by opening the top gas permeable holes 211 and cooperating with the pressure relief valve block 22. The pressure relief valve block can automatically open when the internal pressure of the battery abnormally rises, releasing excess gas to protect the battery from damage. This design greatly improves the safety and reliability of the battery. In this embodiment, a plurality of bottom gas permeable holes 111 are arranged around the bottom sheet 11, and a plurality of top gas permeable holes 211 are arranged around the top sheet 21.

[0031] In this way, by arranging the intermediate gas permeable sheet 23 and the pressure relief valve block 22, the battery can be discharged, and by arranging the waterproof and breathable layer 12, the water in the electrolyte can be locked to prevent water evaporation from greatly shortening the service life of the battery. With the new cap, a waterproof and breathable cylindrical water system battery is successfully realized.

[0032] Please refer to Figures 1-4, the waterproof and breathable cap further comprises a sealing ring 30 for mounting on the battery shell, and the sealing ring 30 wraps the bottom sheet 11 and the top sheet 21. Specifically, the cylindrical battery comprises a shell 40 which wraps the waterproof and breathable cap through the sealing ring 30. It should be noted that the sealing ring 30 tightly wraps the bottom sheet 11 and the top sheet 21, forming a tight sealing system that effectively prevents the intrusion of external moisture and impurities. At the same time, the sealing ring 30 also enhances the connection strength between the cap and the shell 40, improving the overall stability and safety of the battery system. The shell 40 serves as the main structure of the cylindrical battery, providing the necessary space for the electrochemical reaction inside the battery and protecting the battery from external environmental interference through its solid shell. At the same time, the shell 40 is closely connected with the sealing ring 30, together forming the external protective layer of the battery system. In the waterproof and breathable cap, the interaction between each component is closely connected and complementary. The close combination of the bottom sheet 11 and the waterproof and breathable layer 12 ensures the sealing of the battery cavity while allowing gas exchange through the waterproof and breathable layer 12. This design not only ensures the normal operation of the battery, but also effectively prevents the intrusion of external moisture.

[0033] The top sheet 21, pressure relief valve block 22 and intermediate gas permeable sheet 23 in the upper cover assembly 20 together form an efficient gas discharge system. When gas is generated inside the battery, it will first enter the waterproof and breathable layer 12 through the bottom gas permeable hole 111 of the bottom sheet 11, then pass through the intermediate gas permeable hole 233 of the intermediate gas permeable sheet 23, and finally be discharged outside the battery through the top gas permeable hole 211 of the top sheet 21 and the pressure relief valve block 22. During this process, the pressure relief valve block 22 plays a key regulating role, which can automatically open when the internal pressure of the battery reaches a certain level, ensuring timely gas discharge and avoiding safety problems caused by excessive internal pressure of the battery.

[0034] During installation, take one bottom sheet 11, first put the rubber gasket 13 into the bottom sheet 11, then put the waterproof and breathable layer 12. Next, cover the intermediate gas permeable sheet 23, then use the spot welding machine to weld the bottom sheet 11 and the intermediate gas permeable sheet 23 together. Then, use the spot welding machine to weld the three layers of the cap together (six or eight needles). The last step is to use special tools to apply a thin layer of sealing glue inside the sealing ring 30, and then press the welded cap into the sealing ring 30.

[0035] Please refer to Figure 1The bottom sheet 11 is recessed inward to form a recessed mounting groove 112. The bottom cover assembly 10 also includes a rubber gasket 13, which is disposed within the recessed mounting groove 112, and the waterproof and breathable layer 12 is disposed on the rubber gasket 13. It should be noted that the recessed mounting groove 112 provides stable support for the rubber gasket 13 and the waterproof and breathable layer 12.

[0036] Please see Figure 1 and Figure 5 The bottom of the recessed mounting groove 112 is recessed inward to form a secondary recessed groove 113. The secondary recessed groove 113 has a central vent hole 114 and several bottom vent holes 111, both of which communicate with the battery's inner cavity. It should be noted that the recessed mounting groove 112 formed by the inward recess of the base plate 11 not only provides a stable mounting space for the rubber gasket 13, but also optimizes the gas flow path through the further design of the secondary recessed groove 113, achieving communication between the battery's inner cavity and the external environment. The rubber gasket 13 enhances the sealing between the base plate 11 and the waterproof and breathable layer 12, ensuring the waterproof performance of the battery system.

[0037] Please see Figure 1 The intermediate venting sheet 23 includes an outer edge 231 and a central protrusion 232, which are integrally formed. A central vent hole 233 is provided on the central protrusion 232, which protrudes from the outer edge 231. The central protrusion 232 presses the waterproof and breathable layer 12 downwards into the secondary recess 113 of the bottom sheet 11, allowing gas inside the battery cavity to escape through the bottom vent hole 111, the waterproof and breathable layer 12, and the central vent hole 233. It should be noted that the outer edge 231 not only provides the necessary strength and stability but also ensures the stability of the entire venting structure through its tight fit with the top sheet 21 and the bottom sheet 11. This design allows the intermediate venting sheet 23 to maintain its shape and function in various environments, thereby ensuring the normal operation of the battery system. The central protrusion 232 not only allows for smooth gas discharge through the central vent 233, but also, through its protruding design, tightly presses the waterproof and breathable layer 12 into the secondary recessed groove 113 of the substrate 11. This design not only improves the efficiency of gas discharge but also enhances the seal between the waterproof and breathable layer 12 and the substrate 11, ensuring the waterproof performance of the battery system.

[0038] Please see Figure 5The connection between the outer edge part 231 and the middle protruding part 232 has a stepped structure 225, and the pressure relief valve block 22 is arranged on the stepped structure 225. It should be noted that the stepped structure 225 not only enhances the connection strength between components, but also provides stable support for the installation of the pressure relief valve block 22. It ensures that the pressure relief valve block 22 can maintain its function and stability in various environments, thereby ensuring the safe operation of the battery system.

[0039] Please refer to Figure 1 The top sheet 21 includes an edge part 212 and an outer protruding part 213 arranged on the edge part 212. It should be noted that the edge part 212 is used to press the outer edge part 231 of the middle gas permeable sheet 23 on the bottom sheet 11, and the outer protruding part 213 is used to press the pressure relief valve block 22 on the middle gas permeable sheet 23.

[0040] The pressure relief valve block 22 includes a positioning plate 221 and a top holding protruding part 222 arranged on the positioning plate 221. The positioning plate 221 is clamped between the top sheet 21 and the stepped structure of the middle protruding part 232, and the top holding protruding part 222 abuts against the outer protruding part 213 of the top sheet 21. It should be noted that the integral molding of the positioning plate 221 and the top holding protruding part 222 not only enhances the connection strength between components, but also ensures the stability and durability of the entire gas permeable structure.

[0041] Please refer to Figure 1 The outer protruding part 213 of the top sheet 21 is provided with a plurality of top gas permeable holes 211, and the top holding protruding part 222 of the pressure relief valve block 22 and the outer protruding part 213 of the top sheet 21 have a gas permeable ring cavity 223. Each of the top gas permeable holes 211 and the gas permeable ring cavity 223 are in communication, and the gas in the battery cavity can be discharged through the bottom gas permeable hole 111, the waterproof gas permeable layer 12, the middle gas permeable hole 233, the gas permeable ring cavity 223 and the top gas permeable hole 211. It should be noted that the design of the gas permeable ring cavity 223 not only enhances the connection strength between components, but also provides a buffer and adjustment space for the discharge of gas. When the internal pressure of the battery rises, the gas permeable ring cavity 223 can respond quickly and discharge the gas generated in the battery in time, thereby protecting the safe operation of the battery system.

[0042] Please refer to Figure 5The intermediate convex part 232 presses the waterproof and breathable layer 12 downward to the secondary recessed groove 113, so that the waterproof and breathable layer 12 and the bottom sheet 11 form a waterproof and breathable area 224, and the waterproof and breathable area 224 is in communication with each bottom breathable hole 111. Thus, when the waterproof and breathable layer 12 is installed, the closed space formed between the waterproof and breathable layer 12 and the bottom sheet 11 is the waterproof and breathable area 224. The waterproof and breathable area 224 is connected with the outside through the bottom breathable hole 111, realizes efficient exchange of air inside and outside, and prevents water from entering at the same time.

[0043] In another embodiment, a secondary waterproof sheet is further included, which is arranged between the pressure relief valve block 22 and the intermediate breathable sheet 23. The secondary waterproof sheet and the pressure relief valve block 22 are sequentially arranged between the intermediate breathable sheet 23 and the top sheet 21, which can further effectively prevent water evaporation in the battery cavity and ensure the stability of the battery.

[0044] The utility model also provides a cylindrical battery, including the waterproof and breathable type cap hat as described above. The cylindrical battery includes a shell 40, the shell 40 is provided with battery cavity, the battery cavity of shell 40 is used to place battery inner core and electrolyte, and the shell 40 wraps the waterproof and breathable type cap hat. The shell 40 is as the main structure of cylindrical battery, and the shell 40 not only provides necessary space for the electrochemical reaction in the battery, but also protects the battery from the interference of external environment through the solid shell. Meanwhile, the shell 40 is closely connected with the sealing ring 30, and forms the external protective layer of the battery system together.

[0045] The above-mentioned embodiments only express several embodiments of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A waterproof, breathable cap, characterized in that, The application relates to a waterproof and breathable type cap. The bottom cover assembly comprises a bottom sheet and a waterproof and breathable layer arranged on the bottom sheet, and a plurality of bottom breathable holes are arranged on the bottom sheet and used for communicating with a battery inner cavity. The upper cover assembly comprises a top sheet, a pressure relief valve block and an intermediate breathable sheet, the pressure relief valve block is arranged on the top sheet, the intermediate breathable sheet is arranged between the top sheet and the bottom sheet, an intermediate breathable hole is arranged on the intermediate breathable sheet, the top sheet is provided with a plurality of top breathable holes, and the battery inner cavity can discharge gas through the bottom breathable holes, the waterproof and breathable layer, the intermediate breathable hole, the pressure relief valve block and the top breathable holes.

2. The waterproof, breathable cap of claim 1, wherein, The sealing ring is arranged on the battery shell and wraps the bottom sheet and the top sheet.

3. The waterproof, breathable cap of claim 1, wherein, The bottom sheet is inwardly recessed to form an inwardly recessed mounting groove, the bottom cover assembly further comprises a rubber gasket arranged in the inwardly recessed mounting groove, and the waterproof and breathable layer is arranged on the rubber gasket.

4. The waterproof, vapor-permeable cap according to claim 3, characterized in that The bottom of the inwardly recessed mounting groove is inwardly recessed to form a secondary recessed groove, a middle breathable hole and a plurality of bottom breathable holes are arranged on the secondary recessed groove and used for communicating with the battery inner cavity.

5. The waterproof, vapor-permeable cap according to claim 4, characterized in that The intermediate breathable sheet comprises an outer edge portion and an intermediate protruding portion, the outer edge portion and the intermediate protruding portion are integrally formed, the intermediate protruding portion is arranged on the outer edge portion and protrudes from the outer edge portion, the intermediate protruding portion is arranged on the outer edge portion and protrudes from the outer edge portion, and the intermediate protruding portion downwardly presses and combines the waterproof and breathable layer into the secondary recessed groove of the bottom sheet, so that the battery inner cavity can discharge gas through the bottom breathable holes, the waterproof and breathable layer and the intermediate breathable hole.

6. The waterproof and breathable cap according to claim 5, characterized in that, The connection portion of the outer edge portion and the intermediate protruding portion has a step structure, and the pressure relief valve block is arranged on the step structure. The top sheet comprises an edge portion and an outer protruding portion, and the outer protruding portion is arranged on the edge portion. The pressure relief valve block comprises a positioning plate and a top holding protruding portion, the top holding protruding portion is arranged on the positioning plate, the positioning plate is clamped between the top sheet and the step structure of the intermediate protruding portion, and the top holding protruding portion abuts against the outer protruding portion of the top sheet.

7. The waterproof and breathable cap according to claim 6, characterized in that, The outer protruding portion of the top sheet is provided with a plurality of top breathable holes, the top holding protruding portion of the pressure relief valve block and the outer protruding portion of the top sheet have a breathable ring cavity, each top breathable hole communicates with the breathable ring cavity, and the battery inner cavity can discharge gas through the bottom breathable holes, the waterproof and breathable layer, the intermediate breathable hole, the breathable ring cavity and the top breathable holes.

8. The waterproof, vapor-permeable cap according to claim 5, characterized in that The intermediate protruding portion downwardly presses and combines the waterproof and breathable layer into the secondary recessed groove, so that a waterproof and breathable area is formed between the waterproof and breathable layer and the bottom sheet, and the waterproof and breathable area respectively communicates with each bottom breathable hole.

9. The waterproof, vapor-permeable cap according to claim 1, characterized in that A secondary waterproof sheet is arranged between the pressure relief valve block and the intermediate breathable sheet.

10. A cylindrical battery characterized by comprising: The waterproof and breathable type cap comprises the waterproof and breathable type cap according to any one of claims 1 to 9 and a shell wrapping the waterproof and breathable type cap.

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