Leakage-proof structure of sealing end cover of lead-acid storage battery and mounting method of leakage-proof structure

Abstract

The invention discloses a leakage-proof structure of a lead-acid storage battery sealing end cover and a mounting method of the leakage-proof structure, and relates to the technical field of lead-acid storage batteries. An edge matching part is arranged on the edge of an end cover body, an inclined sealing groove and a peripheral inclined plane groove are formed in the edge matching part, an inner sealing gasket with a Y-shaped flow blocking strip is embedded in the inclined sealing groove, and an inclined plane sealing gasket with a modified nylon elastic piece is arranged in the peripheral inclined plane groove. The inner wall of the edge matching part and a related contact area are coated with an anti-corrosion coating ring layer, and the edge matching part is provided with a positioning column which is matched with a positioning hole of a battery shell. When the structure is mounted, all the components are assembled in sequence, and then the end cover body and the battery shell are pressed tightly. According to the structure disclosed by the invention, double sealing is matched with an anti-corrosion design, so that leakage caused by aging of the sealing gasket and acid liquor erosion is avoided, excessive dependence on waterproof glue is not needed, the service life is prolonged, and the use safety and reliability of the lead-acid storage battery are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lead-acid storage batteries, in particular to a leak-proof structure of a sealed end cover of a lead-acid storage battery and a mounting method thereof. BACKGROUND

[0002] Lead-acid storage batteries are widely used in the fields of transportation and energy storage due to their low cost, large capacity and strong reliability. As a key component of lead-acid storage batteries, the leak-proof performance of the sealed end cover directly affects the safety and service life of the battery. The existing leak-proof structure of the sealed end cover of the lead-acid storage battery mainly uses a single sealing gasket combined with waterproof glue, which has many technical defects:

[0003] Firstly, the sealing structure is single, and the sealing gasket is in the battery acid environment for a long time, which is prone to aging and deformation, resulting in a decrease in sealing performance and an increase in acid leakage risk;

[0004] Secondly, the contact area between the sealing gasket and the end cover and the shell lacks effective corrosion protection, and acid corrosion can damage the sealing performance of the contact interface, further exacerbating the leakage problem;

[0005] Thirdly, when relying on waterproof glue for auxiliary sealing, the waterproof glue will age and crack after long-term use, losing the sealing effect, and subsequent maintenance is difficult.

[0006] These problems result in insufficient leak-proof reliability of the existing sealed end cover, short service life, and serious impact on the overall performance and safety of the lead-acid storage battery, and there is an urgent need for a leak-proof structure that is reasonable in structure, reliable in sealing, resistant to aging and corrosion to solve the above technical problems. SUMMARY

[0007] To solve the above technical problems, the present application is realized by the following technical scheme:

[0008] The present application provides a leak-proof structure of a sealed end cover of a lead-acid storage battery, comprising an end cover body, and an edge fitting part adapted to the battery shell is arranged at the edge of the end cover body. The edge fitting part is provided with a slant sealing groove and a peripheral inclined surface groove. The groove wall of the slant sealing groove is inclined, and an inner sealing gasket is embedded at the position of the slant sealing groove. A Y-shaped flow barrier strip is arranged on the upper side of the inner sealing gasket. The contact areas between the inner wall of the edge fitting part, the battery shell and the inner sealing gasket are coated with an anti-corrosion coating layer, and the anti-corrosion coating layer of the inner wall of the edge fitting part extends to the inner wall area of the slant sealing groove.

[0009] A slant sealing gasket is arranged in the peripheral inclined surface groove. The upper and lower sides of the slant sealing gasket are provided with contact inclined surfaces. A plurality of elastic grooves are arranged on the inner and outer ring sides of the slant sealing gasket. Modified nylon elastic sheets are clamped at the positions of the elastic grooves. The inner side of the elastic groove is provided with a limiting clamping groove, and the modified nylon elastic sheet is provided with a limiting clamping strip clamped in the limiting clamping groove.

[0010] As a preferred technical scheme of the structure of the application: the peripheral inclined groove of the edge fitting part is provided with a plurality of positioning columns, the battery shell is provided with positioning holes, and the inclined sealing gasket is provided with through holes, the positioning columns vertically pass through the through holes and are inserted into the positioning holes.

[0011] As a preferred technical scheme of the structure of the application: 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 adopts a polytetrafluoroethylene coating.

[0012] As a preferred technical scheme of the structure of the application: the Y-shaped flow barrier strip includes a first flow barrier part and a second flow barrier part, the second flow barrier part abuts against the anti-corrosion coating layer, and the first flow barrier part is provided with an inclined downward flow guide surface on the top side.

[0013] As a preferred technical scheme of the structure of the application: the inclined sealing gasket and the inner peripheral sealing gasket are made of the same material, and the thickness of the inclined sealing gasket is smaller than that of the inner peripheral sealing gasket.

[0014] As a preferred technical scheme of the structure of the application: the peripheral inclined groove is arranged along the bottom side of the edge fitting part and matches the contact inclined surface on the upper side of the inclined sealing gasket. The battery shell is provided with a lower inclined groove which matches the contact inclined surface on the lower side of the inclined sealing gasket.

[0015] As a preferred technical scheme of the structure of the application: the maximum vertical width of the limiting clamping groove is greater than the vertical opening size of the limiting clamping groove towards the elastic groove.

[0016] The application provides a mounting method of a lead-acid storage battery sealing end cover leak-proof structure, which comprises the following steps:

[0017] Link one: prepare the end cover body, the inner peripheral sealing gasket, the inclined sealing gasket, the modified nylon elastic sheet and the related parts of the battery shell.

[0018] Link two: uniformly apply an anti-corrosion coating layer to the contact areas of the inner wall of the edge fitting part, the battery shell and the inner peripheral sealing gasket.

[0019] Link three: embed the inner peripheral sealing gasket into the inclined sealing groove, and make the Y-shaped flow barrier strip abut against the anti-corrosion coating layer.

[0020] Link four: align the limiting clamping strip of the modified nylon elastic sheet with the limiting clamping groove of the inclined sealing gasket, and clamp the modified nylon elastic sheet into the elastic groove.

[0021] Link five: place the inclined sealing gasket with the assembled modified nylon elastic sheet into the peripheral inclined groove, and make the contact inclined surface fit the peripheral inclined groove.

[0022] Sixth, the edge fitting part of the end cover body is aligned with the upper end of the battery shell, and the end cover body is pressed to a preset position, so that the inner sealing gasket and the inclined sealing gasket are tightly arranged between the edge fitting part and the upper end of the battery shell.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] The double sealing structure composed of the inner sealing gasket and the inclined sealing gasket, and the modified nylon elastic piece clamped on the inner and outer ring sides of the inclined sealing gasket, can ensure the extrusion contact with the groove wall even if the sealing gasket is aged after long-term use, without excessive dependence on waterproof glue, avoiding the problem of aging failure of the waterproof glue, and prolonging the service life of the sealing structure.

[0025] In the present application, the inner wall of the edge fitting part and the contact area are coated with a polytetrafluoroethylene corrosion-resistant coating layer, which has excellent acid corrosion resistance, can effectively isolate the acid liquid from the sealing interface, and at the same time extends to the inner wall of the inclined sealing groove, further protecting the sealing groove structure and maintaining long-term sealing effect. BRIEF DESCRIPTION OF DRAWINGS

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

[0027] Figure 2 It is Figure 1 It is a structure schematic diagram of the local enlargement of A in the middle.

[0028] Figure 3 It is a structure schematic diagram of the disassembly of the end cover body, the battery shell and the related sealing pieces in the present application.

[0029] Figure 4 It is a structure schematic diagram of the inner sealing gasket in the present application.

[0030] Figure 5 It is a structure schematic diagram of the inclined sealing gasket in the present application.

[0031] Wherein: 1-end cover body, 101-edge fitting part, 102-positioning column, 2-inclined sealing groove, 3-outer inclined groove, 4-inner sealing gasket, 401-Y-shaped flow barrier strip, 4011-first flow barrier part, 4012-second flow barrier part, 40111-flow guiding surface, 5-inclined sealing gasket, 501-through hole, 502-contacting inclined surface, 503-elastic groove, 504-limiting clamping groove, 505-modified nylon elastic piece, 506-limiting clamping strip, 6-corrosion-resistant coating layer, 7-battery shell, 701-lower inclined groove, 702-positioning hole. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0033] Embodiment one, in combination Figure 1 , Figure 3 , the designed leakage-proof structure takes the end cover body 1 as the basic carrier, the end cover body 1 is internally provided with a plurality of reinforcing ribs for improving the overall structural strength of the end cover body 1 to avoid affecting the sealing effect due to stress deformation in long-term use. The edge of the end cover body 1 is provided with an edge matching part 101 adapted to the battery shell 7, the edge matching part 101 serves as the installation basis of the sealing structure and is provided with two groove structures with different functions, i.e. a slant sealing groove 2 and a peripheral inclined surface groove 3, which correspond to the assembly of the inner peripheral sealing gasket 4 and the inclined surface sealing gasket 5 respectively, forming a double-sealing protection system, while cooperating with the anticorrosion coating layer 6, the modified nylon elastic sheet 505, the positioning column 102 and other auxiliary structures to realize the improvement of sealing reliability and service life.

[0034] In combination Figure 1 , Figure 3 , the edge matching part 101 serves as the connection transition structure of the end cover body 1 and the battery shell 7, the inner side wall and the contact area with the inner peripheral sealing gasket 4 are coated with the anticorrosion coating layer 6, and the anticorrosion coating layer 6 extends to the inner wall area of the slant sealing groove 2, which can reduce the corrosion of the slant sealing groove 2 and ensure long-term sealing effect. The peripheral inclined surface groove 3 of the edge matching part 101 is provided with a plurality of positioning columns 102 for realizing the precise positioning of the end cover body 1, the inclined surface sealing gasket 5 and the battery shell 7.

[0035] In combination Figure 1 , Figure 3 , the slant sealing groove 2 is arranged in the inner side of the edge matching part 101, the groove wall of the slant sealing groove 2 is arranged in an inclined manner, the included angle between the inclined groove wall and the vertical direction of the end cover body 1 is 15-60°, and the inclined design can enhance the extrusion sealing effect of the inner peripheral sealing gasket 4; the slant sealing groove 2 is used for embedding the inner peripheral sealing gasket 4, and the anticorrosion coating layer 6 coated on the groove wall of the slant sealing groove 2 further improves the acid corrosion resistance.

[0036] In combination Figure 1 , Figure 3 , Figure 5 , the peripheral inclined surface groove 3 is arranged along the bottom side of the edge matching part 101, the groove structure of the peripheral inclined surface groove 3 cooperates with the contact inclined surface 502 on the upper side of the inclined surface sealing gasket 5 to provide installation and positioning space for the inclined surface sealing gasket 5, and simultaneously enhances the sealing contact area through the inclined surface fitting design.

[0037] In 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] CombinationFigure 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: Insert the inner sealing gasket (4) into the inclined 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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