A sealing structure for lead-acid battery casing

Abstract

A lead-acid battery casing sealing structure includes a battery casing and a battery top cover located at the top of the battery casing. The top cover has a valve hole at its center and terminal hole on each of its left and right sides. A safety valve assembly is housed within the valve hole. Terminal bushings are embedded within the terminal hole, with a first embedding mechanism around the perimeter of the terminal bushing and a second embedding mechanism at the lower end of the terminal bushing. The safety valve assembly includes an inner valve body, an outer valve body, and a valve body cover. This design uses PP material for both the battery casing and the top cover, offering advantages such as corrosion resistance, light weight, and low cost. The terminal bushings in the terminal hole of the top cover are embedded with ABS material. The first and second embedding mechanisms of the terminal bushings ensure secure embedding within the terminal hole, forming a single piece through injection molding, significantly improving the structural strength against loosening. The ABS material terminal bushings are firmly bonded to the battery terminals with adhesive, achieving a complete seal without gas or acid leakage, thus ensuring battery safety.

Description

Technical Field

[0001] This utility model relates to the field of battery product technology, and in particular to a sealing structure for a lead-acid battery casing. Background Technology

[0002] Lead-acid battery casings made of PP material offer advantages such as corrosion resistance, light weight, and low cost, making them suitable for mass production and application. PP material exhibits good corrosion resistance to acids, alkalis, and other chemicals, effectively resisting corrosion from the electrolyte inside the lead-acid battery and ensuring the long-term stability of the casing. PP material is also easy to injection mold, allowing for the creation of complex shapes and structures to meet the needs of different battery designs, and boasts high production efficiency. However, existing lead-acid battery casings made of PP material suffer from a problem of non-adhesion between the adhesive and the PP material. Because the adhesive and PP material do not bond, the battery terminal holes on the casing are sealed with rubber gaskets. The PP material is prone to deformation, causing the rubber seal to become loose, leading to significant air and acid leakage, which compromises battery safety.

[0003] To overcome the aforementioned problems, we have invented a sealing structure for lead-acid battery casings. Utility Model Content

[0004] The purpose of this invention is to solve the problem that existing lead-acid battery casings made of PP material rely on rubber gaskets for sealing the battery terminal holes. However, the PP material is prone to deformation, leading to loose rubber seals and easy leakage of air and acid, thus compromising battery safety. The specific solution is as follows: A lead-acid battery casing sealing structure includes a battery casing and a battery cover located at the upper end of the battery casing. The battery cover has a valve hole at its center, and a terminal hole is provided on each of the left and right sides of the valve hole. A safety valve assembly is provided in the valve hole. A terminal bushing is embedded in the terminal hole. A first embedding mechanism is provided around the periphery of the terminal bushing. A second embedding mechanism is provided at the lower end of the terminal bushing. The safety valve assembly includes three parts: an inner valve body, an outer valve body, and a valve body cover.

[0005] Furthermore, the first embedding mechanism is a multi-ring toothed structure with uniform spacing located on the lower half of the outer periphery of the pole post bushing.

[0006] Furthermore, the second embedding mechanism is a concave circle located at the lower end of the pole post bushing and a downward protruding mechanism located within the concave circle.

[0007] Furthermore, the downward protruding mechanism includes a first boss and a second boss located below the first boss.

[0008] Furthermore, the height of the second boss is greater than the height of the first boss, and the longitudinal section of the first boss is rectangular while the longitudinal section of the second boss is inverted trapezoidal.

[0009] Furthermore, the upper inner edge of the pole bushing is exposed and forms an annular surface, which is connected to the inner inclined surface at the upper end of the pole hole, forming a funnel-shaped cavity.

[0010] Furthermore, the lower outer edge of the pole bushing is embedded in the floating ring at the lower end of the pole hole.

[0011] Furthermore, the interior of the pole bushing is through, comprising a large cylindrical cavity at the top and a small cylindrical cavity at the bottom, with the large cylindrical cavity communicating with the small cylindrical cavity.

[0012] Furthermore, the inner valve body includes an outer threaded wall and an inner valve tube, as well as a frustum at the upper end and a hexagonal nut on the frustum. The lower end of the valve tube protrudes downwards, and two staggered inlet holes are provided on both sides of the lower end.

[0013] Furthermore, the upper end of the outer valve body is provided with a toothed platform, and a hexagonal platform is provided on the toothed platform. Each notch along the periphery of the toothed platform is a vent hole. A sealing ring is fitted on the middle peripheral wall of the outer valve body. The lower end of the outer valve body is provided with multiple barbs, which hook into the lower edge of the valve hole. The interior of the outer valve body is through from top to bottom and is provided with threads that match the threaded wall of the inner valve body and are threadedly connected to the inner valve body. The periphery of the toothed platform is provided with an annular groove, which matches and engages with the lower edge of the valve body cover. In summary, the technical solution of this utility model has the following beneficial effects: This invention solves the problem of existing lead-acid battery casings made of PP material relying on rubber gaskets for sealing the battery terminal holes. However, the PP material is prone to deformation, leading to loose seals and easy leakage of air and acid, compromising battery safety. The proposed solution uses PP material for both the battery casing and the battery cover, offering advantages such as corrosion resistance, light weight, and low cost, making it suitable for large-scale production and application. It effectively resists corrosion from the electrolyte inside the lead-acid battery, ensuring the long-term stability of the battery casing. An ABS material terminal bushing is embedded in the terminal hole of the battery cover. A first embedding mechanism around the perimeter of the bushing and a second embedding mechanism at the lower end of the bushing ensure secure embedding within the terminal hole. Through injection molding, they form a single piece, significantly improving the structural strength against loosening. The ABS material terminal bushing is designed to firmly bond to the battery terminals (including the positive and negative terminals) with adhesive, achieving a complete seal without leakage of air or acid, thus ensuring battery safety. This design's safety valve assembly uses an outer valve body made of PP material, which is sealed to the valve hole in the battery cover via a sealing ring. The crucial inner valve body is made of ABS material, improving its mechanical strength and stability, thus ensuring the quality and lifespan of the safety valve assembly. To accommodate potential future acid additions, two acid addition holes are pre-drilled on the battery cover. In summary, this design is rationally designed, improving the sealing performance of the PP lead-acid battery casing, enhancing the stability of the safety valve assembly, and ensuring the safety of the lead-acid battery. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort. Figure 1 This is an exploded view of a sealing structure for a lead-acid battery casing according to the present invention; Figure 2 This is a partial cross-sectional view of the present invention; Figure 3 This is a structural diagram of the battery casing of this utility model; Figure 4 This is another structural diagram of the battery casing of this utility model; Figure 5 This is a structural diagram of the battery cover of this utility model; Figure 6 This is an exploded view of the safety valve assembly of this utility model; Figure 7 Structural diagram of the pole bushing of this utility model; Figure 8This is another structural diagram of the pole bushing of this utility model; Figure 9 The structural diagram of the inner valve body of this utility model.

[0015] Explanation of reference numerals in the attached figures: 10-Battery casing, 11-Reinforcing rib, 12-Grid area, 20-Battery top cover, 21-Valve hole, 22-Terminal hole, 23-Inner bevel, 24-Floating ring, 25-Acid filling hole, 26-Rib block, 30-Terminal bushing, 31-Geared ring, 32-Concave circle, 33-First boss, 34-Second boss, 35-Large cylindrical cavity, 36-Small cylindrical cavity, 37-Annular surface, 40-Safety valve assembly, 41-Inner valve body, 411-Threaded wall, 412-Valve tube, 413-Frustum, 414-Hex nut, 415-Inlet hole, 42-Outer valve body, 421-Geared platform, 4211-Notch, 4212-Annular groove, 422-Hex truncated platform, 4221-Outlet hole, 423-Barb, 43-Valve body cover, 44-Sealing ring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0017] like Figures 1 to 9 As shown, a lead-acid battery casing sealing structure includes a battery casing 10 and a battery cover 20 disposed on the upper end of the battery casing 10. The battery cover 20 has a valve hole 21 at its center, and a terminal hole 22 on each side of the valve hole 21 for installing the positive and negative terminals of the battery (not shown in the figure). A safety valve assembly 40 is disposed within the valve hole 21. A terminal bushing 30 is embedded within the terminal hole 22. A first embedding mechanism is provided around the periphery of the terminal bushing 30, and a second embedding mechanism is provided at the lower end of the terminal bushing 30. The safety valve assembly 40 includes an inner valve body 41, an outer valve body 42, and a valve body cover 43. Preferably, the battery casing 10, battery cover 20, outer valve body 42, and valve body cover 43 are made of PP material, and the terminal bushing 30 and inner valve body 41 are made of ABS material.

[0018] Specifically, the first embedding mechanism is a multi-ring toothed ring 31 with uniform spacing located on the lower half of the outer periphery of the pole post bushing 30.

[0019] Specifically, the second embedding mechanism is an indented circle 32 located at the lower end of the pole post bushing 30 and a downward protruding mechanism located in the indented circle 32.

[0020] Specifically, the downward protruding mechanism includes a first boss 33 and a second boss 34 located below the first boss 33.

[0021] Specifically, the height of the second boss 34 is greater than the height of the first boss 33, and the longitudinal section of the first boss 33 is rectangular, while the longitudinal section of the second boss 34 is an inverted trapezoid.

[0022] Specifically, the upper inner edge of the pole bushing 30 is exposed and forms an annular surface 37, which is connected to the inner inclined surface 23 at the upper end of the pole hole 22, and the inner inclined surface 23 forms a funnel-shaped cavity.

[0023] Specifically, the lower outer edge of the pole bushing 30 is embedded in the floating ring 24 at the lower end of the pole hole 22.

[0024] Specifically, the interior of the pole bushing 30 is through, including a large cylindrical cavity 35 in the upper part and a small cylindrical cavity 36 in the lower part, and the large cylindrical cavity 35 and the small cylindrical cavity 36 are connected.

[0025] Specifically, the inner valve body 41 includes an outer threaded wall 411 and an inner valve tube 412, a frustum 413 at the upper end and a hexagonal nut 414 on the frustum 413. The frustum 413 and the hexagonal nut 414 are an integral structure. The lower end of the valve tube 412 is exposed downwards, and two staggered inlet holes 415 are provided on both sides of the lower end (inlet holes for the gas formed in the lead-acid battery to enter the safety valve assembly 40 upwards).

[0026] Specifically, the upper end of the outer valve body 42 is provided with a toothed platform 421, and a hexagonal platform 422 is provided on the toothed platform 421. Two outlet holes 4221 are provided on both sides of the hexagonal platform 422 (for venting air from the inner valve body 41). Each notch 4211 around the toothed platform 421 is a vent hole (for the outward exhaust hole of the safety valve assembly 40). A sealing ring 44 is fitted on the middle peripheral wall of the outer valve body 42. The lower end of the outer valve body 42 is provided with multiple barbs 423, which hook into the lower end edge of the valve hole 21. The interior of the outer valve body 42 is through and has threads that match the threaded wall 411 of the inner valve body 41 and are threadedly connected to the inner valve body 41. The circumference of the toothed platform 421 is provided with an annular groove 4212, which matches and engages with the lower edge of the valve body cover 43.

[0027] The purpose of this design is to use ABS material for the terminal bushing 30 so that it can be firmly bonded to the battery terminals (including the positive and negative terminals, not shown in the figure) with adhesive, achieving a complete seal (battery terminals) without air or acid leakage, thus ensuring battery safety. The pre-produced terminal bushing 30 is placed into the injection mold of the battery cover 20 and injection molded together to form an integrated injection molded part (i.e., the battery cover 20 and terminal bushing 30 combined part). Then, the battery cover 20 and terminal bushing 30 combined part is firmly joined to the battery casing 10 by heat fusion. After installing the positive and negative terminals, the gaps between the positive and negative terminals and the terminal bushing 30 are sealed tightly with adhesive. Lead-acid electrolyte is injected through the valve hole 21 using an acid pot (not shown in the figure). After injection, the safety valve assembly 40 is installed into the valve hole 21. To accommodate users who may need to add acid later, this design includes two pre-drilled acid-adding holes 25 on the battery cover 20 (these holes are blocked before use). The safety valve assembly 40 primarily serves a venting function. During charging and discharging of the lead-acid battery, gas is generated inside. This gas enters the valve tube 412 through the two inlet holes 415 at the lower end of the valve tube 412, turns upwards inside the valve body cover 43, and then exits through the two outlet holes 4221 and multiple recesses 4211 (i.e., the venting holes of the safety valve assembly 40).

[0028] To improve the structural strength of the battery casing 10, multiple reinforcing ribs 11 are provided inside, and a grid area 12 is provided on the outer bottom, which can prevent wear during bottom movement and improve the bottom heat dissipation effect during operation. To enable the battery cover 20 to have positioning capability and structural reinforcement, multiple ribs 26 are provided on its inner side.

[0029] In summary, the technical solution of this utility model has the following beneficial effects: This invention solves the problem of existing lead-acid battery casings made of PP material relying on rubber gaskets for sealing the battery terminal holes. However, the PP material is prone to deformation, leading to loose seals and easy leakage of air and acid, compromising battery safety. The proposed solution uses PP material for both the battery casing and the battery cover, offering advantages such as corrosion resistance, light weight, and low cost, making it suitable for large-scale production and application. It effectively resists corrosion from the electrolyte inside the lead-acid battery, ensuring the long-term stability of the battery casing. An ABS material terminal bushing is embedded in the terminal hole of the battery cover. A first embedding mechanism around the perimeter of the bushing and a second embedding mechanism at the lower end of the bushing ensure secure embedding within the terminal hole. Through injection molding, they form a single piece, significantly improving the structural strength against loosening. The ABS material terminal bushing is designed to firmly bond to the battery terminals (including the positive and negative terminals) with adhesive, achieving a complete seal without leakage of air or acid, thus ensuring battery safety. This design's safety valve assembly uses an outer valve body made of PP material, which is sealed to the valve hole in the battery cover via a sealing ring. The crucial inner valve body is made of ABS material, improving its mechanical strength and stability, thus ensuring the quality and lifespan of the safety valve assembly. To accommodate potential future acid additions, two acid addition holes are pre-drilled on the battery cover. In summary, this design is rationally designed, improving the sealing performance of the PP lead-acid battery casing, enhancing the stability of the safety valve assembly, and ensuring the safety of the lead-acid battery.

[0030] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A lead acid battery case seal structure comprising a battery case and a battery top cover provided at an upper end of the battery case, characterized by: The battery cover has a valve hole in the center, and a terminal hole is provided on the left and right sides of the valve hole. A safety valve assembly is provided in the valve hole. A terminal bushing is embedded in the terminal hole. A first embedding mechanism is provided around the terminal bushing. A second embedding mechanism is provided at the lower end of the terminal bushing. The safety valve assembly includes three parts: an inner valve body, an outer valve body, and a valve body cover.

2. A lead-acid battery case sealing structure according to claim 1, characterized by: The first embedding mechanism is a multi-ring toothed structure with uniform spacing located on the lower half of the outer periphery of the pole bushing.

3. The lead-acid battery casing sealing structure according to claim 1, characterized in that: The second embedding mechanism is an inner concave circle located at the lower end of the pole post bushing and a downward protruding mechanism located within the inner concave circle.

4. The lead-acid battery casing sealing structure according to claim 3, characterized in that: The downward protruding mechanism includes a first boss and a second boss located below the first boss.

5. The lead-acid battery casing sealing structure according to claim 4, characterized in that: The height of the second boss is greater than the height of the first boss, and the longitudinal section of the first boss is rectangular while the longitudinal section of the second boss is inverted trapezoidal.

6. The lead-acid battery casing sealing structure according to claim 1, characterized in that: The upper inner edge of the pole bushing is exposed and forms an annular surface, which is connected to the inner inclined surface at the upper end of the pole hole, forming a funnel-shaped cavity.

7. The lead-acid battery casing sealing structure according to claim 1, characterized in that: The lower outer edge of the pole bushing is embedded in the floating ring at the lower end of the pole hole.

8. The lead-acid battery casing sealing structure according to claim 1, characterized in that: The interior of the pole bushing is through, consisting of a large cylindrical cavity at the top and a small cylindrical cavity at the bottom, which are connected.

9. The lead-acid battery casing sealing structure according to claim 1, characterized in that: The inner valve body includes an outer threaded wall and an inner valve tube, a truncated cone at the upper end and a hexagonal nut on the truncated cone, the lower end of the valve tube protruding downwards, and two staggered inlet holes on both sides of the lower end.

10. The lead-acid battery casing sealing structure according to claim 9, characterized in that: The upper end of the outer valve body is provided with a toothed platform, and a hexagonal platform is provided on the toothed platform. Each notch along the periphery of the toothed platform is a vent hole. A sealing ring is fitted on the middle peripheral wall of the outer valve body. The lower end of the outer valve body is provided with multiple barbs, which hook into the lower edge of the valve hole. The interior of the outer valve body is through from top to bottom and is provided with threads that match the threaded wall of the inner valve body and are threadedly connected to the inner valve body. The periphery of the toothed platform is provided with an annular groove, which matches and engages with the lower edge of the valve body cover.

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