Acid kettle tool for formation of valve-regulated lead-acid battery

Abstract

An acid pot tool for formation of a valve-regulated lead-acid battery comprises an acid pot main body, and the middle part of the acid pot main body is provided with a cavity for accommodating electrolyte; a connector matched with a storage battery liquid injection hole is arranged at the bottom of the acid pot body, external threads matched with internal threads of the storage battery liquid injection hole are arranged on the periphery of the connector, and a rubber sealing ring is sleeved on the outer wall of the connector at the bottom of the external threads. An annular groove is independently arranged in an acid pot main body cavity close to the upper port of the acid pot main body, the outer annular wall of the annular groove is the inner wall of the acid pot main body, the top end of the inner annular wall of the annular groove is provided with a sealing plate, and the sealing plate is provided with small holes; the acid pot further comprises a rubber cap, the rubber cap is sleeved outside the inner ring wall of the annular groove through an opening in the bottom end, a gap between the outer wall of the rubber cap and the outer ring wall of the annular groove forms an annular exhaust gap, an upper port of the acid pot body is connected with a cover piece, and a gap reserved between the cover piece and the top end of the rubber cap forms an exhaust channel. The gas-liquid separator is compact in structure and reliable in sealing and has a gas-liquid separation function.

Description

Technical Field

[0001] This utility model relates to the technical field of battery production equipment, specifically to an acid pot tooling used in the charging and formation of valve-regulated lead-acid batteries. Background Technology

[0002] In existing battery manufacturing technologies, traditional filling hole sealing structures often employ simple plugs or gaskets to address the issue of electrolyte expansion caused by gas generated during the charging and formation process. These structures present several problems in practical use: First, the sealing effect is poor. Vibrations and temperature changes during battery charging and discharging allow acid to easily leak from the filling hole connection, corroding production equipment, polluting the production environment, and affecting battery performance and production quality. Second, there is a lack of measures to address acid expansion. When acid expands due to gas generation, there is insufficient space to accommodate the excess acid, leading to overflow and subsequent acid deficiency in the battery, causing capacity decay and shortening battery life. Third, effective gas-liquid separation is impossible. During charging, gas generation causes acid to splash, and traditional structures cannot effectively isolate the splashed acid internally. Furthermore, gas venting is often obstructed, potentially leading to excessive internal battery pressure and posing a safety hazard.

[0003] In existing technologies, there are also attempts to solve these problems by combining independent exhaust pipes with liquid storage tanks. However, this solution has a complex structure, which increases the difficulty and cost of assembly. In addition, there are many sealing connection points between the components. As the usage time increases, the sealing components are prone to aging and failure, which reduces the reliability of the entire system. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide a valve-regulated lead-acid battery formation acid pot tooling with a compact structure, reliable sealing and gas-liquid separation function, so as to solve the problems of leakage, acid overflow and acid shortage in the charging and formation process of batteries in the prior art.

[0005] The technical solution of this utility model is: a valve-regulated lead-acid battery formation acid pot tooling, including an acid pot body, the middle of which is a chamber for containing electrolyte; a connector that mates with the battery filling hole is provided at the bottom of the acid pot body, the outer periphery of the connector is provided with an external thread that mates with the internal thread of the battery filling hole, a rubber sealing ring is fitted on the outer wall of the connector at the bottom of the external thread, and the upper part of the rubber sealing ring is in contact with the bottom surface of the acid pot body; an annular groove is independently provided in the cavity of the acid pot body near the upper port of the acid pot body, the outer ring wall of the annular groove is the inner wall of the acid pot body, and the inner ring of the annular groove is... The top of the wall is sealed by a plate with small holes; it also includes a rubber cap for sealing the small holes. The top of the rubber cap is closed and the bottom is open. The rubber cap is fitted over the inner wall of the annular groove through the bottom opening. The inner wall of the rubber cap and the inner wall of the annular groove are interference-fitted. The gap between the outer wall of the rubber cap and the outer wall of the annular groove forms an annular venting gap. A cover plate for limiting the rubber cap is connected at the upper port of the acid pot body. The gap between the cover plate and the top of the rubber cap forms an venting channel. The middle part of the cover plate is the rubber cap area corresponding to the rubber cap. There is a ring of holes around the cover plate corresponding to the annular venting gap.

[0006] The acid pot has an acid-blocking plate inside its main chamber. The opening in the middle of the acid-blocking plate is connected to the mouth of a small cylinder. The bottom of the small cylinder has a small hole. The outer wall of the small cylinder, the inner wall of the acid pot, and the acid-blocking plate form an annular groove.

[0007] The outer wall of the connector is provided with a groove for positioning the rubber sealing ring.

[0008] The acid pot body is a thick cylindrical tube, and the connector is a thin cylindrical tube. The acid pot body and the connector form a stepped cylindrical structure.

[0009] The rubber sealing ring is fitted to the end face of the battery filling hole.

[0010] The sealing plate is 3-4mm lower than the top surface of the outer ring wall of the annular groove. The depth of the annular groove is 20-50mm, the diameter of the small hole is 3-5mm, and the diameter of the outer ring wall of the annular groove is 1-2mm larger than the outer diameter of the rubber cap to form an annular exhaust gap. A gap of 0.5-1.0mm is reserved between the top of the cover plate and the top of the rubber cap to form an exhaust channel.

[0011] The rubber cap has a wall thickness of 1-3 mm.

[0012] The cover is a hexagonal flat plastic cover, and the edge of the cover is fused to the upper end of the acid pot body by a hot-melt process.

[0013] The wall thickness of the welding area is 3-5mm, and the penetration depth is 2-4mm.

[0014] Holes are provided around the cover plate outside the rubber cap area.

[0015] The features of this utility model are as follows:

[0016] 1. The bottom connector of the acid tank body is fitted with an annular rubber sealing ring. The annular rubber sealing ring is fixed in position by two protruding grooves on the wall. The rubber sealing ring is made of acid-resistant elastic material and is connected to the battery filling hole through a spiral tightening structure to achieve a reliable seal between the acid tank and the battery filling hole.

[0017] 2. The sinking groove design on the upper part of the acid pot body, and the gas-liquid one-way valve control structure with a rubber cap installed in the groove, a plastic cover at the top for limiting, and hot-melt welding, realize gas-liquid separation and one-way valve control functions.

[0018] 3. The cover plate connected to the top of the acid pot is hexagonal. The hexagon is fitted with a screwdriver sleeve. One end of the screwdriver sleeve is connected and fixed to an electric wrench. The electric wrench can rotate the acid pot to seal the rubber sealing ring on the acid pot with the end face of the injection hole.

[0019] 4. The combined application of the above-mentioned sealing structure and valve control structure in the acid pot tooling solves the problems of leakage, acid overflow and acid shortage in the battery charging and formation process.

[0020] 5. Regarding the material of the rubber sealing ring, in addition to EPDM rubber, other elastic materials with good acid resistance, such as fluororubber, can also be selected to adapt to different usage environments and requirements. For the screw-on tightening structure, a snap-fit ​​connection structure can also be considered. An elastic snap is set at the bottom connector of the acid reservoir body, which cooperates with the corresponding groove on the battery filling hole to achieve quick installation and sealing, and can achieve a similar sealing effect.

[0021] 6. The shape of the rubber cap can be adjusted according to actual needs, such as using a spherical crown or other shapes, as long as it can achieve the functions of opening and venting under air pressure and liquid sealing under acid. For the fixing method of the plastic cap, in addition to hot-melt welding, ultrasonic welding or adhesive bonding can also be used, but it is necessary to ensure that the fixing strength and sealing performance meet the requirements. Regarding the implementation of the gas-liquid separation principle, the convex top surface of the groove can be sealed, and then 2-4 notches can be left at the edge of the convex surface. Gas pushes the rubber cap to expand through the notches, and then the gas is discharged through the gaps while preventing acid from passing through. Alternatively, a membrane structure with micropores can be used to replace the rubber cap. This membrane structure allows gas to pass through but prevents acid from passing through, thus achieving the gas-liquid separation function.

[0022] This invention relates to the effective management and sealing of gas and liquid during the charging and formation process of storage batteries. It improves the stability and reliability of battery production, reduces damage to equipment and the environment caused by acid leakage and spillage, while ensuring battery performance and lifespan, reducing production costs, and increasing production efficiency. The beneficial effects are as follows:

[0023] 1. Achieve reliable sealing, effectively preventing acid from leaking out from the connection between the bottom of the acid tank and the battery filling hole, avoiding acid pollution of equipment and the environment, and ensuring the safety and stability of the production process.

[0024] 2. It has a volume compensation function, which can accommodate the acid that expands due to gas generation during charging, prevent acid from overflowing, and ensure that the battery will not experience capacity decay due to lack of acid during subsequent use, thereby improving battery performance and lifespan.

[0025] 3. Implement gas-liquid one-way valve control, allowing only gas to pass through, isolating acid splashed during the charging process inside the acid container to prevent acid from overflowing, while ensuring smooth gas discharge during the charging process. Attached Figure Description

[0026] Figure 1 shows the overall structure of the acid jug tooling of this utility model;

[0027] Figure 2 is an exploded view of the components of the acid jug tooling;

[0028] Figure 3 is a structural diagram of the acid pot fixture;

[0029] Figure 4 is Figure 2 One of the magnified views of a section;

[0030] Figure 5 yes Figure 2 Part 2 of the enlarged view

[0031] Figure 6 yes Figure 2 A sectional view;

[0032] Attached diagram descriptions: 1. Acid pot body; 2. Connector; 3. Rubber sealing ring; 4. External thread; 5. Settled groove; 6. Rubber cap; 7. Plastic cover; 8. Air screwdriver sleeve. Detailed Implementation

[0033] Figure 1-6 The acid pickling fixture mainly consists of the acid pickling pot body, and its specific structure and working principle are as follows:

[0034] 1. Bottom Sealing Component: The bottom of the acid reservoir body is equipped with a connector that mates with the battery filling hole. The connector is a cylindrical boss with an external thread 4 on its outer circumference, which mates with the internal thread of the battery filling hole. An annular rubber sealing ring is fitted onto the boss portion of the connector. The annular rubber sealing ring is fixed in position by two raised grooves on the wall. The rubber sealing ring is made of acid-resistant elastic material. The rubber sealing ring is embedded in the grooves on the bottom surface of the boss, forming an interference fit. During installation, align the external thread of the acid reservoir body with the internal thread of the battery filling hole, and then rotate the acid reservoir body clockwise. As it rotates, the rubber sealing ring is compressed, producing radial elastic deformation, thereby filling the gap between the filling hole and the acid reservoir body. When the tightening torque reaches 2-5 N·m, the rubber sealing ring and the end face of the filling hole are completely in contact, with a contact stress ≥0.5MPa, achieving a reliable sealing effect and preventing acid leakage from the connector.

[0035] 2. Upper Valve Control Structure: The upper part of the acid pot body has a sinking annular groove 5. A convex cylindrical shape is located in the center of the groove, with its top surface 3-4mm lower than the top surface of the acid pot groove. Multiple small holes are located at the top of the convex surface to facilitate the exhaust of gas generated during charging. Each small hole has a diameter of 3-5mm. The groove depth is 20-50mm, and the groove diameter is 1-2mm larger than the outer diameter of the rubber cap, forming an annular exhaust gap. A rubber cap 6 is installed on the convex part in the center of the groove. The rubber cap 6 is a closed-top, open-bottom, hollow annular cylinder with a wall thickness of 1-3mm. Its inner diameter matches the convex part in the center of the groove in an interference fit. The top surface is pressed down by a plastic cover (hereinafter referred to as the cover 7). The center of the cover 7 pressing against the rubber cap has no through holes, but multiple through holes are located on the edge outside the rubber cap area. The cover 7 limits the rubber cap 6, preventing it from falling off. A 0.5-1.0mm gap is reserved at the top of the cover plate 7 and the rubber cap 6 to form an exhaust channel. The plastic cover plate is a hexagonal flat plate structure, and its edge is fused to the top surface of the groove of the acid pot body by a hot-melt process. The wall thickness of the welded area is 3-5mm, and the weld depth is 2-4mm. The cover plate 7 has multiple through holes, which serve as exhaust channels for the gas generated during the charging process. The holes avoid the part of the cover plate pressing against the rubber cap. The gas generated during the charging process first passes through the reserved exhaust channel between the cover plate 7 and the rubber cap 6. After the gas reaches a certain pressure, it expands the rubber cap 6 and is discharged from the annular exhaust gap, and then from the hole in the cover plate 7. The reserved exhaust channel consists of two parts: the first part is the 0.5-1.0mm gap reserved at the top of the cover plate 7 and the rubber cap 6 to form the exhaust channel; the second part is the 1-2mm gap reserved between the outer diameter of the rubber cap and the side of the groove to form the annular exhaust gap.

[0036] 3. External connection structure: The top of the acid pot is fused with the cover plate. The cover plate is hexagonal in shape and 10-15mm thick. The cover plate is held in place by a screwdriver sleeve. One end of the screwdriver sleeve is connected and fixed to an electric wrench. The electric wrench outputs torque to rotate the acid pot, so that the rubber sealing ring installed at the bottom of the acid pot is completely in contact with the end face of the battery filling hole, thus achieving a seal.

[0037] 4. Working Principle: During the battery charging and formation process, when the internal gas pressure increases (usually ≥10kPa), the gas pressure pushes the rubber cap 6 to expand, forming an annular venting gap (0.5-1.0mm) between the rubber cap 6 and the convex edge in the center of the groove. The gas passes through this gap and then exits through the hole on the cover, achieving the venting function. When the acid rises due to volume expansion, a small amount of acid comes into contact with the top surface of the rubber cap. At this time, due to the surface tension of the liquid and the weight and elastic force of the rubber cap, the acid cannot overflow through the venting gap, thus forming a liquid seal and isolating the splashed acid inside the acid reservoir. When the gas pressure decreases, the rubber cap 6 returns to its original position under the action of gravity and its own elastic force, blocking the venting gap again and preventing acid leakage. At the same time, the middle of the acid reservoir body provides an independent expansion space with a volume ≥1.5 times the maximum expansion volume of the electrolyte (with a safety margin), which can accommodate the acid that expands due to gas generation during charging and prevent acid overflow.

Claims

1. A tooling for an acid container used in the formation of valve-regulated lead-acid batteries, characterized in that: The system includes an acid reservoir body (1), with a chamber in the middle for holding electrolyte. A connector (2) is provided at the bottom of the acid reservoir body (1) to mate with the battery filling hole. An external thread (4) is provided on the outer periphery of the connector (2) to mate with the internal thread of the battery filling hole. A rubber sealing ring (3) is fitted around the outer wall of the connector (2) at the bottom of the external thread (4), and the rubber sealing ring (3) is in contact with the bottom surface of the acid reservoir body (1). An annular groove (5) is independently provided in the chamber of the acid reservoir body (1) near the upper port. The outer wall of the annular groove (5) is the inner wall of the acid reservoir body (1), and the top of the inner wall of the annular groove (5) is sealed with a plate with small holes. (52); also includes a rubber cap (6) for sealing the small hole, the top of the rubber cap (6) is closed and the bottom is open, the rubber cap (6) is fitted on the inner wall of the annular groove through the bottom opening, the inner wall of the rubber cap (6) is interference fit with the inner wall of the annular groove (5), the gap between the outer wall of the rubber cap (6) and the outer wall of the annular groove (5) forms an annular exhaust gap, a cover plate (7) for limiting the rubber cap (6) is connected at the upper port of the acid pot body (1), the gap reserved between the cover plate (7) and the top of the rubber cap (6) forms an exhaust channel, the middle part of the cover plate (7) is the rubber cap area corresponding to the rubber cap (6), and there is a ring of holes around the cover plate (7) corresponding to the annular exhaust gap.

2. The valve-regulated lead-acid battery formation acid pot tooling according to claim 1, characterized in that: The acid pot body (1) has an acid baffle plate (51) in the cavity. The opening in the middle of the acid baffle plate is connected to the mouth of a small cylinder. The bottom of the small cylinder has a small hole (52). The outer wall of the small cylinder, the inner wall of the acid pot body (1), and the acid baffle plate form an annular groove.

3. The valve-regulated lead-acid battery formation acid pot tooling according to claim 1, characterized in that: The outer wall of the connector (2) is provided with a groove for positioning the rubber sealing ring (3).

4. The valve-regulated lead-acid battery formation acid pot tooling according to claim 1, characterized in that: The acid pot body (1) is a thick cylindrical tube, and the connector (2) is a thin cylindrical tube. The acid pot body (1) and the connector (2) form a stepped cylindrical structure.

5. The valve-regulated lead-acid battery formation acid pot tooling according to claim 1, characterized in that: The rubber sealing ring (3) is attached to the end face of the battery injection hole.

6. The valve-regulated lead-acid battery formation acid pot tooling according to claim 1, characterized in that: The sealing plate is 3-4 mm shorter than the top surface of the outer ring wall of the annular groove (5). The depth of the annular groove (5) is 20-50 mm, the diameter of the small hole is 3-5 mm, and the diameter of the outer ring wall of the annular groove (5) is 1-2 mm larger than the outer diameter of the rubber cap (6) to form an annular exhaust gap. A 0.5-1.0 mm gap is reserved between the top of the cover plate (7) and the top of the rubber cap (6) to form an exhaust channel.

7. The valve-regulated lead-acid battery formation acid pot tooling according to claim 1, characterized in that: The rubber cap (6) has a wall thickness of 1-3 mm.

8. The valve-regulated lead-acid battery formation acid pot tooling according to claim 1, characterized in that: The cover (7) is a hexagonal flat plastic cover, and the edge of the cover (7) is fused together with the upper end of the acid pot body (1) by a hot-melt process.

9. The valve-regulated lead-acid battery formation acid pot tooling according to claim 8, characterized in that: The wall thickness of the welding area is 3-5mm, and the penetration depth is 2-4mm.

10. The valve-regulated lead-acid battery formation acid pot tooling according to claim 1, characterized in that: Holes are provided around the cover plate (7) outside the rubber cap area.

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