Leakproof structure of a sealing end cover of a lead-acid storage battery and installation method thereof

Abstract

The application discloses a leakage-proof structure of a lead-acid storage battery sealing end cover and a mounting method thereof, and relates to the technical field of lead-acid storage batteries.In the application, an edge matching part is arranged at the edge of an end cover body, the edge matching part is provided with an inclined sealing groove and a peripheral inclined groove, an inner peripheral sealing gasket with a Y-shaped flow barrier strip is arranged in the inclined sealing groove, a peripheral inclined sealing gasket with a modified nylon elastic sheet is arranged in the peripheral inclined groove, the inner wall of the edge matching part and the related contact area are coated with an anticorrosion coating layer, and the edge matching part is provided with a positioning column matched with a positioning hole of a battery shell.The application is characterized in that, when the structure is mounted, each component is sequentially assembled, and then the end cover body and the battery shell are pressed tightly.The structure is provided with double sealing and anticorrosion design, so that leakage caused by aging of the sealing gasket and acid liquid corrosion is avoided, the waterproof glue does not need to be excessively relied on, the service life is prolonged, and the use safety and reliability of the lead-acid storage battery are improved.

Description

Technical Field

[0001] This invention relates to the field of lead-acid battery technology, and in particular to a leak-proof structure for a lead-acid battery sealing end cap and its installation method. Background Technology

[0002] Lead-acid batteries are widely used in transportation, energy storage, and power supply due to their low cost, large capacity, and high reliability. As a key component of lead-acid batteries, the leak-proof performance of the sealing end cap directly affects the battery's safety and lifespan. Current leak-proof structures for lead-acid battery sealing end caps mostly use a single sealing gasket combined with waterproof adhesive, which has several technical shortcomings:

[0003] Firstly, the sealing structure is simple, and the sealing gasket is in the acidic environment inside the battery for a long time, which makes it prone to aging and deformation, resulting in a decrease in sealing performance and an increased risk of acid leakage.

[0004] Secondly, the contact area between the gasket and the end cap and housing lacks effective corrosion protection. Acid erosion will damage the sealing of the contact interface and further aggravate the leakage problem.

[0005] Third, when relying on waterproof adhesive for sealing, the adhesive will age and crack after long-term use, losing its sealing effect, and subsequent maintenance will be difficult.

[0006] These problems result in insufficient reliability and short service life of existing sealed end caps, seriously affecting the overall performance and safety of lead-acid batteries. There is an urgent need for a leak-proof structure that is reasonable, reliable in sealing, anti-aging, and corrosion-resistant to solve the above technical problems. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0008] This invention provides a leak-proof structure for a lead-acid battery sealing end cap, including an end cap body with an edge fitting portion that adapts to the battery casing. The edge fitting portion has an inclined sealing groove and a peripheral inclined groove. The wall of the inclined sealing groove is inclined, and an inner sealing gasket is embedded at the position of the inclined sealing groove. A Y-shaped flow-blocking strip is provided on the upper side of the inner sealing gasket. The inner wall of the edge fitting portion, the contact area between the battery casing and the inner sealing gasket, are all coated with an anti-corrosion coating layer, and the anti-corrosion coating layer on the inner wall of the edge fitting portion extends to the inner wall area of ​​the inclined sealing groove.

[0009] An inclined sealing gasket is provided in the outer inclined groove. The upper and lower sides of the inclined sealing gasket are provided with contact inclined surfaces. Multiple elastic grooves are opened on both the inner and outer ring sides of the inclined sealing gasket. Modified nylon springs are installed at the positions of the elastic grooves. A limiting groove is provided on the inner side of the elastic groove. The modified nylon spring is provided with a limiting strip that is installed in the limiting groove.

[0010] As a preferred technical solution of the structure of the present invention: a number of positioning posts are provided at the outer inclined groove position of the edge mating part, the battery shell is provided with positioning holes, the inclined sealing gasket is provided with through holes, and the positioning posts pass vertically through the through holes and are inserted into the positioning holes.

[0011] As a preferred technical solution of the structure of the present invention: the angle between the inclined groove wall of the inclined sealing groove and the vertical direction of the end cover body is 15-60°, and the anti-corrosion coating layer is made of polytetrafluoroethylene coating.

[0012] As a preferred technical solution of the structure of the present invention: the Y-shaped flow-blocking strip includes a first flow-blocking part and a second flow-blocking part, the second flow-blocking part abuts against the anti-corrosion coating layer, and the top side of the first flow-blocking part is provided with an inclined downward flow-guiding surface.

[0013] As a preferred technical solution of the structure of the present invention: the inclined sealing gasket and the inner sealing gasket are made of the same material, and the thickness is less than that of the inner sealing gasket.

[0014] As a preferred embodiment of the structure of the present invention: the peripheral inclined groove is provided along the bottom side of the edge mating part and mates with the contact inclined surface on the upper side of the inclined sealing gasket. The battery casing has a lower inclined groove that mates with the contact inclined surface on the lower side of the inclined sealing gasket.

[0015] As a preferred technical solution of the structure of the present invention: the maximum vertical width of the limiting slot is greater than the vertical opening size of the limiting slot facing the elastic groove.

[0016] This invention provides a method for installing a leak-proof structure for a sealed end cap of a lead-acid battery, comprising the following steps:

[0017] Step 1: Prepare the end cap body, inner sealing gasket, beveled sealing gasket, modified nylon spring sheet, and related components of the battery casing.

[0018] Step 2: Apply an anti-corrosion coating evenly to the inner wall of the edge mating part and the contact area between the battery casing and the inner sealing gasket.

[0019] Step 3: Embed the inner sealing gasket into the inclined sealing groove so that the Y-shaped baffle strip abuts against the anti-corrosion coating.

[0020] Step 4: Align the limiting strip of the modified nylon spring with the limiting groove of the inclined sealing gasket, and insert the modified nylon spring into the elastic groove.

[0021] Step 5: Place the beveled sealing gasket with the modified nylon spring sheet into the outer beveled groove, so that the contact bevel fits into the outer beveled groove.

[0022] Step 6: Align the edge mating part of the end cap body with the upper edge of the battery housing, and press the end cap body down to the preset position so that the inner sealing gasket and the bevel sealing gasket are tightly disposed between the edge mating part and the upper edge of the battery housing.

[0023] Compared with existing technologies, the beneficial effects of this invention are:

[0024] This invention employs a dual sealing structure consisting of an inner sealing gasket and a beveled sealing gasket. Modified nylon springs, which are snapped onto the inner and outer rings of the beveled sealing gasket, utilize their elastic restoring properties to ensure compression contact with the groove wall even if the sealing gasket ages after long-term use. This eliminates the need for excessive reliance on waterproof adhesive, avoids the problem of waterproof adhesive aging and failure, and extends the service life of the sealing structure.

[0025] In this invention, the polytetrafluoroethylene anti-corrosion coating layer applied to the inner wall of the edge mating part and the contact area has excellent acid corrosion resistance, which can effectively isolate the acid from the erosion of the sealing interface, and at the same time extend to the inner wall of the inclined sealing groove, further protecting the sealing groove structure and maintaining the long-term sealing effect. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the lead-acid battery box of the present invention.

[0027] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0028] Figure 3 This is a structural diagram showing the disassembly of the end cap body, battery casing, and related sealing components in this invention.

[0029] Figure 4 This is a schematic diagram of the inner sealing gasket in this invention.

[0030] Figure 5 This is a schematic diagram of the inclined sealing gasket in this invention.

[0031] Wherein: 1-End cap body, 101-Edge mating part, 102-Positioning post, 2-Angled sealing groove, 3-Outer bevel groove, 4-Inner sealing gasket, 401-Y-shaped baffle strip, 4011-First baffle part, 4012-Second baffle part, 40111-Guiding surface, 5-Angled sealing gasket, 501-Through hole, 502-Contact bevel, 503-Elastic groove, 504-Limiting slot, 505-Modified nylon spring, 506-Limiting strip, 6-Anti-corrosion coating, 7-Battery casing, 701-Lower bevel groove, 702-Positioning hole. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0033] Example 1, Combination Figure 1 , Figure 3 The leak-proof structure designed in this invention uses the end cap body 1 as the basic carrier. The end cap body 1 has several reinforcing ribs inside to improve the overall structural strength of the end cap body 1 and prevent deformation due to stress from affecting the sealing effect during long-term use. The edge of the end cap body 1 has an edge mating part 101 that is adapted to the battery shell 7. The edge mating part 101 serves as the installation base for the sealing structure and has two groove structures with different functions—an inclined sealing groove 2 and an outer inclined groove 3, which correspond to the assembly of the inner sealing gasket 4 and the inclined sealing gasket 5, respectively, forming a double sealing protection system. At the same time, it is combined with auxiliary structures such as the anti-corrosion coating ring 6, the modified nylon spring sheet 505, and the positioning post 102 to improve the sealing reliability and service life.

[0034] Combination Figure 1 , Figure 3 The edge mating part 101 serves as a transitional structure connecting the end cap body 1 and the battery housing 7. Its inner wall and the contact area with the inner sealing gasket 4 are coated with an anti-corrosion coating 6, which extends to the inner wall area of ​​the inclined sealing groove 2. This reduces corrosion of the inclined sealing groove 2 and ensures a long-term sealing effect. Several positioning posts 102 are provided at the outer inclined groove 3 of the edge mating part 101 to achieve precise positioning of the end cap body 1, the inclined sealing gasket 5, and the battery housing 7.

[0035] Combination Figure 1 , Figure 3 The oblique sealing groove 2 is opened inside the edge mating part 101. The groove wall of the oblique sealing groove 2 is set at an angle of 15 to 60° with the vertical direction of the oblique groove wall and the end cover body 1. This oblique design can enhance the compression sealing effect of the inner sealing gasket 4. The oblique sealing groove 2 is used to embed the inner sealing gasket 4. The anti-corrosion coating 6 coated on the groove wall of the oblique sealing groove 2 further enhances the acid corrosion resistance.

[0036] Combination Figure 1 , Figure 3 , Figure 5 The outer inclined groove 3 is provided along the bottom side of the edge mating part 101. The groove structure of the outer inclined groove 3 is matched with the contact inclined surface 502 on the upper side of the inclined sealing gasket 5, providing installation and positioning space for the inclined sealing gasket 5. At the same time, the sealing contact area is enhanced by the inclined fitting design.

[0037] Combination Figure 3The positioning post 102 is vertically set at the position of the outer inclined groove 3. It can pass vertically through the through hole 501 of the inclined sealing gasket 5 and be inserted into the positioning hole 702 of the battery casing 7 to achieve precise positioning of the three and avoid the sealing gasket shifting during the assembly process, which would cause the seal to fail.

[0038] Combination Figure 1 , Figure 3 , Figure 4 The inner sealing gasket 4 is embedded in the inclined sealing groove 2. Its material is the same as the inclined sealing gasket 5, but its thickness is greater. This thickness design ensures that during downward pressure, when the gasket descends vertically by one unit, the actual compression degree of the inner sealing gasket 4 is less than that of the inclined sealing gasket 5, ensuring that both achieve a good sealing effect. A Y-shaped baffle strip 401 is provided on the upper side of the inner sealing gasket 4 to block and backflow acid.

[0039] Combination Figure 2 , Figure 4 The Y-shaped baffle 401 is located on the upper side of the inner sealing gasket 4, and includes a first baffle portion 4011 and a second baffle portion 4012. The second baffle portion 4012 abuts against the anti-corrosion coating layer 6 to form the first baffle barrier. The top side of the first baffle portion 4011 is provided with an inclined downward guiding surface 40111, which can return the acid splashed onto the opening of the Y-shaped baffle 401 and prevent the acid from penetrating to the sealing interface.

[0040] Combination Figure 1 , Figure 3 , Figure 5 The inclined sealing gasket 5 is assembled within the outer inclined groove 3. Both the upper and lower sides of the inclined sealing gasket 5 are provided with contact inclined surfaces 502. The upper contact inclined surface 502 of the inclined sealing gasket 5 fits into the outer inclined groove 3, and the lower contact inclined surface 502 of the inclined sealing gasket 5 mates with the lower inclined groove 701 of the battery casing 7. The double inclined surface fit increases the sealing contact area. The inclined sealing gasket 5 has a through hole 501 for inserting the positioning post 102. Multiple elastic grooves 503 are provided on both the inner and outer ring sides of the inclined sealing gasket 5 for mounting modified nylon spring clips 505.

[0041] Combination Figure 5 The elastic groove 503 is formed on the inner and outer ring sides of the inclined sealing gasket 5. A limiting groove 504 is provided on the inner side of the elastic groove 503. The maximum vertical width of the limiting groove 504 is greater than the vertical opening size facing the elastic groove 503, forming a snap-fit ​​limiting structure to ensure stable assembly of the modified nylon spring sheet 505.

[0042] The main components of modified nylon spring sheet 505 are 55%–70% PA66 chips, 15%–25% chopped glass fiber (GF, diameter 10–13 μm, length 3–5 mm, treated with silane coupling agent KH-550), 3%–6% PTFE, 2%–4% SiO2, 0.3%–0.8% antioxidant, 0.2%–0.5% UV absorber, 0.1%–0.3% carbon black, 3%–8% maleic anhydride grafted polyolefin elastomer (POE-g-MAH, grafting rate ≥0.8%), 0.3%–0.8% lubricant (ethylene bis-stearamide EBS), and 0.1%–0.3% anti-exudation agent (polyether amide block copolymer PEBA).

[0043] The material consists of PA66 chips as the substrate, chopped glass fiber (GF, diameter 10-13 μm, length 3-5 mm, treated with silane coupling agent KH-550) as the reinforcing material, PTFE and SiO2 as corrosion-resistant modifiers, antioxidants, UV absorbers, and carbon black as aging-resistant additives, maleic anhydride-grafted polyolefin elastomer as the toughening agent, and ethylene bis-stearamide (EBS) and polyether amide block copolymer (PEBA) as processing aids.

[0044] Modified nylon spring sheet 505 has an elongation at break of ≥30% and good resilience, making it suitable for spring sheets subjected to low to medium frequency stress. After adding carbon black and UV absorbers, the outdoor weather resistance of modified nylon is improved to more than 3 years without embrittlement. Furthermore, through fluorine modification or nano-silica filling, it is resistant to dilute hydrochloric acid, dilute sulfuric acid, and organic acids, avoiding nylon hydrolysis.

[0045] Combination Figure 2 , Figure 5 The modified nylon spring 505 is fitted into the elastic groove 503, and the modified nylon spring 505 is provided with a limiting strip 506 that matches the limiting groove 504. Utilizing its own elastic restoring properties, the modified nylon spring 505 ensures that the inclined sealing gasket 5 can still maintain compressive contact with the inner wall of the outer inclined groove 3 even after long-term use and aging, without excessive reliance on waterproof adhesive and avoiding the problem of waterproof adhesive aging and failure. The limiting strip 506 is located on both sides of the modified nylon spring 505 and is fitted into the limiting groove 504, achieving a fixed connection between the modified nylon spring 505 and the inclined sealing gasket 5, preventing the modified nylon spring 505 from falling off during use.

[0046] Combination Figure 3 The anti-corrosion coating layer 6 is made of polytetrafluoroethylene, which has excellent acid corrosion resistance. The anti-corrosion coating layer 6 is applied to the inner wall of the edge mating part 101, the contact area between the battery casing 7 and the inner sealing gasket 4, and extends to the inner wall of the inclined sealing groove 2. It can effectively isolate acid from the erosion of the sealing interface and sealing groove, and maintain the long-term sealing effect.

[0047] Combination Figure 1 , Figure 3 , Figure 5 The upper edge of the battery housing 7 is fitted with the edge mating part 101. The battery housing 7 has a lower inclined groove 701 and a positioning hole 702. The lower inclined groove 701 mates with the lower contact inclined surface 502 of the inclined sealing gasket 5 to form a fitting base for the outer seal. The positioning hole 702 mates with the positioning post 102 and the through hole 501 to achieve precise positioning and assembly of the end cap and the housing. The lower inclined groove 701 is located at the upper edge of the battery housing 7 and mates with the lower contact inclined surface 502 of the inclined sealing gasket 5. The inclined fit enhances the reliability of the outer seal. The positioning hole 702 is located at the position corresponding to the positioning post 102 at the upper edge of the battery housing 7. It is used to insert the positioning post 102 to achieve positioning and fixing of the end cap body 1, the inclined sealing gasket 5 and the battery housing 7.

[0048] Example 2: The present invention designs an installation method for a lead-acid battery sealing end cap leak-proof structure, including the following steps to ensure accurate assembly and effective sealing of each component.

[0049] Step 1: Component preparation: Prepare the end cap body 1, inner circumference sealing gasket 4, beveled sealing gasket 5, modified nylon spring sheet 505, and battery casing 7, etc., and ensure that each component is undamaged and meets the assembly requirements.

[0050] Step 2: Applying the anti-corrosion coating: Apply the anti-corrosion coating layer 6 evenly to the inner wall of the edge mating part 101 and the contact area between the battery casing 7 and the inner sealing gasket 4, ensuring that the coating covers completely, has a uniform thickness, and extends to the inner wall area of ​​the inclined sealing groove 2, so as to achieve comprehensive anti-corrosion protection.

[0051] Step 3: Inner circumference sealing gasket assembly: The inner circumference sealing gasket 4 is embedded into the oblique sealing groove 2 to ensure that the inner circumference sealing gasket 4 is tightly fitted with the inner wall of the oblique sealing groove 2, and the first flow-blocking part 4011 of the Y-shaped flow-blocking strip 401 is reliably in contact with the anti-corrosion coating ring 6, forming the initial fit of flow blocking and sealing.

[0052] Step 4: Modified Nylon Spring Assembly: Align the limiting strip 506 of the modified nylon spring 505 with the limiting groove 504 of the inclined sealing gasket 5, and snap the modified nylon spring 505 into the elastic groove 503, ensuring that the limiting strip 506 is fully engaged in the limiting groove 504, and that the modified nylon spring 505 is securely installed without any looseness.

[0053] Step 5: Assemble the inclined sealing gasket: Place the inclined sealing gasket 5 with the modified nylon spring sheet 505 assembled into the outer inclined groove 3, adjust the position so that the contact inclined surface 502 on the upper side of the inclined sealing gasket 5 is completely in contact with the outer inclined groove 3, and the through hole 501 is aligned with the positioning post 102.

[0054] Step 6: Assembly of end cap and housing: Align the edge mating part 101 of the end cap body 1 with the upper edge of the battery housing 7, align the positioning post 102 with the through hole 501 of the inclined sealing gasket 5, and slowly press the end cap body 1 down to the preset position to ensure that the inner sealing gasket 4 and the inclined sealing gasket 5 are tightly disposed between the edge mating part 101 and the upper edge of the battery housing 7 to form a double sealing structure.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A leak-proof structure for a sealed end cap of a lead-acid battery, characterized in that: Includes an end cap body (1), the edge of which is provided with an edge fitting part (101) that is adapted to the battery housing (7). The edge mating part (101) is provided with an inclined sealing groove (2) and an outer inclined groove (3); The inclined sealing groove (2) has an inclined groove wall. An inner sealing gasket (4) is embedded in the inclined sealing groove (2). A Y-shaped baffle strip (401) is provided on the upper side of the inner sealing gasket (4). The inner wall of the edge mating part (101), the contact area between the battery casing (7) and the inner sealing gasket (4) are all coated with an anti-corrosion coating layer (6). The anti-corrosion coating layer (6) of the inner wall of the edge mating part (101) extends to the inner wall area of ​​the inclined sealing groove (2). The outer inclined groove (3) is provided with an inclined sealing gasket (5). The upper and lower sides of the inclined sealing gasket (5) are provided with contact inclined surfaces (502). Multiple elastic grooves (503) are provided on both the inner and outer ring sides of the inclined sealing gasket (5). Modified nylon spring pieces (505) are installed at the positions of the elastic grooves (503). The inner side of the elastic grooves (503) is provided with a limiting groove (504). The modified nylon spring piece (505) is provided with a limiting strip (506) that is installed in the limiting groove (504).

2. The leak-proof structure of the lead-acid battery sealing end cap according to claim 1, characterized in that: The outer inclined groove (3) of the edge mating part (101) is provided with a number of positioning posts (102), the battery housing (7) is provided with positioning holes (702), the inclined sealing gasket (5) is provided with through holes (501), and the positioning posts (102) pass vertically through the through holes (501) and are inserted into the positioning holes (702).

3. The leak-proof structure of the lead-acid battery sealing end cap according to claim 1, characterized in that: The angle between the inclined groove wall of the inclined sealing groove (2) and the vertical direction of the end cap body (1) is 15-60°. The anti-corrosion coating layer (6) is made of polytetrafluoroethylene.

4. The leak-proof structure of the lead-acid battery sealing end cap according to claim 1, characterized in that: The Y-shaped baffle (401) includes a first baffle (4011) and a second baffle (4012). The second baffle (4012) abuts against the anti-corrosion coating (6). The top side of the first baffle (4011) is provided with an inclined downward guide surface (40111).

5. The leak-proof structure of the lead-acid battery sealing end cap according to claim 1, characterized in that: The inclined sealing gasket (5) is made of the same material as the inner sealing gasket (4), and its thickness is less than that of the inner sealing gasket (4).

6. The leak-proof structure of the lead-acid battery sealing end cap according to claim 1, characterized in that: The peripheral inclined groove (3) is provided along the bottom side of the edge mating part (101) and mates with the contact inclined surface (502) on the upper side of the inclined sealing gasket (5); The battery casing (7) has a lower inclined groove (701) that matches the lower contact inclined surface (502) of the inclined sealing gasket (5).

7. The leak-proof structure of the lead-acid battery sealing end cap according to claim 1, characterized in that: The maximum vertical width of the limiting slot (504) is greater than the vertical opening size of the limiting slot (504) facing the elastic groove (503).

8. The leak-proof structure of the sealed end cap of a lead-acid battery according to claim 1, characterized in that, Including the installation method of its leak-proof structure: Step 1: Prepare the end cap body (1), inner circumference sealing gasket (4), inclined sealing gasket (5), modified nylon spring sheet (505) and battery casing (7) and related components; Step 2: Apply a uniform anti-corrosion coating (6) to the inner wall of the edge mating part (101), the contact area between the battery casing (7) and the inner sealing gasket (4); Step 3: Embed the inner sealing gasket (4) into the oblique sealing groove (2) so that the Y-shaped baffle strip (401) abuts against the anti-corrosion coating (6); Step 4: Align the limiting strip (506) of the modified nylon spring (505) with the limiting groove (504) of the inclined sealing gasket (5), and the modified nylon spring (505) is inserted into the elastic groove (503); Step 5: Place the inclined sealing gasket (5) with the modified nylon spring sheet (505) into the outer inclined groove (3); Step 6: Align the edge mating part (101) of the end cap body (1) with the upper edge of the battery housing (7), and press the end cap body (1) down to the preset position so that the inner sealing gasket (4) and the inclined sealing gasket (5) are tightly arranged between the edge mating part (101) and the upper edge of the battery housing (7).

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