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CN-224217650-U - Battery relief valve and lead-acid storage battery

CN224217650UCN 224217650 UCN224217650 UCN 224217650UCN-224217650-U

Abstract

The utility model provides a battery safety valve and a lead-acid storage battery, belonging to the technical field of storage battery safety valves, comprising a valve seat, a valve seat and a valve seat, wherein an exhaust valve body is arranged in the valve seat, and a gas channel is arranged in the exhaust valve body; the rubber cap is sleeved at the air outlet end of the air outlet valve body, the top cover is positioned at the port of the air outlet end of the air outlet valve body, the peripheral wall part surrounds the air outlet valve body, the convex ribs are in facial line contact with the outer wall of the air outlet valve body, and a gap is reserved between the inner wall surface of the peripheral wall part and the outer wall surface of the air outlet valve body. The utility model has the beneficial effects that the inner wall surface of the rubber cap is attached and sealed with the outer wall surface of the exhaust valve body in a line contact mode, so that the contact area between the rubber cap and the exhaust valve body is reduced, the safety valve is easier to open when the internal pressure of the battery is increased, the sensitivity of the safety valve is improved, and the difference value between the opening threshold and the closing threshold is reduced.

Inventors

  • CHEN HONG
  • CHEN KAI

Assignees

  • 浙江虹达特种橡胶制品有限公司

Dates

Publication Date
20260508
Application Date
20250528

Claims (20)

  1. 1.A battery safety valve, comprising: The valve seat (100), the valve seat (100) is internally provided with an exhaust valve body (200), and the exhaust valve body (200) is internally provided with a gas channel (210); The rubber cap (300), the rubber cap (300) comprises a top cover part (310) and a peripheral wall part (320) formed by bending and extending the outer edge of the top cover part (310), wherein a convex rib (321) is arranged on the inner wall surface of the peripheral wall part (320), and the convex rib (321) is of a ring-shaped closed structure extending along the circumferential direction of the peripheral wall part (320); The rubber cap (300) is sleeved at the air outlet end of the exhaust valve body (200), the top cover part (310) is located at the port of the air outlet end of the exhaust valve body (200), the peripheral wall part (320) surrounds the exhaust valve body (200), the convex ribs (321) are in facial line contact with the outer wall of the exhaust valve body (200), and a gap is reserved between the inner wall surface of the peripheral wall part (320) and the outer wall surface of the exhaust valve body (200).
  2. 2. A battery safety valve according to claim 1, wherein the top cover portion (310), the inner wall surface of the peripheral wall portion (320), the outer wall surface of the exhaust valve body (200), and the bead (321) enclose a clearance cavity (110), and the bead (321) interrupts a communication path between the clearance cavity (110) and the inside of the valve seat (100).
  3. 3. A battery safety valve according to claim 2, wherein the end face of the air outlet end of the air outlet valve body (200) is provided with at least one ventilation notch (220), the top cover part (310) covers the end face of the air outlet end of the air outlet valve body (200), and the clearance cavity (110) is communicated with the air channel (210) through the ventilation notch (220).
  4. 4. A battery safety valve according to claim 1 or 2, wherein the thickness of the bead (321) gradually decreases in a direction away from the peripheral wall portion (320).
  5. 5. A battery safety valve according to claim 1, wherein the rubber cap (300) is formed of a fluororubber member or a fluorosilicone rubber member or a chloroprene rubber member or a nitrile rubber member or an ethylene propylene diene rubber member.
  6. 6. A battery safety valve according to claim 1, wherein when the pressure inside the exhaust valve body (200) is greater than an opening threshold, the rubber cap (300) is deformed in a stretching manner and the bead (321) is separated from the outer wall surface of the exhaust valve body (200), and when the internal pressure of the exhaust valve body (200) is smaller than a closing threshold, the bead (321) is in contact with the outer wall surface line of the exhaust valve body (200) under the elastic action of inward contraction of the peripheral wall portion (320), and the rubber cap (300) seals the air outlet end of the exhaust valve body (200).
  7. 7. A battery safety valve according to claim 1, wherein the air inlet end of the air outlet valve body (200) is provided with a first inclined buffer surface (230) and a second inclined buffer surface (240), the tail end of the first inclined buffer surface (230) and the tail end of the second inclined buffer surface (240) have a height difference in the axial direction of the air outlet valve body (200), an air inlet (211) is arranged between the tail end of the first inclined buffer surface (230) and the tail end of the second inclined buffer surface (240), and the plane of the air inlet (211) is not perpendicular to the axial direction of the air channel (210).
  8. 8. A battery safety valve according to claim 7, wherein the plane of the gas inlet (211) is perpendicular to the radial direction of the gas passage (210).
  9. 9. A battery safety valve according to claim 1, wherein a partition plate (130) is arranged between an inner wall surface of the valve seat (100) and an outer wall surface of the exhaust valve body (200), the partition plate (130) is internally divided into an upper cavity area (140) and a lower cavity area (150) in the valve seat (100), an air inlet end of the exhaust valve body (200) is positioned in the lower cavity area (150), an air outlet end of the exhaust valve body (200) is positioned in the upper cavity area (140), and the upper cavity area (140) and the lower cavity area (150) are communicated through the air passage (210).
  10. 10. A battery safety valve according to claim 9, wherein a acid filter seat (400) is installed in the valve seat (100), the acid filter seat (400) is sealed in the upper cavity area (140), the acid filter seat (400) is pressed against the top cover part (310) and enables the top cover part (310) to be attached to the end face of the air outlet end of the air outlet valve body (200).
  11. 11. A battery safety valve according to claim 10, wherein the acid filter base (400) is provided with a plurality of air holes (410), the acid filter base (400) is provided with acid filter sheets (420), and the acid filter sheets (420) seal each air hole (410).
  12. 12. A battery safety valve according to claim 11, wherein the acid filter sheet (420) is formed of a polypropylene or polyethylene or polytetrafluoroethylene member having ventilation micropores.
  13. 13. A battery safety valve according to claim 10, wherein a storage chamber (120) is formed by enclosing the partition plate (130), the acid filter base (400), the inner wall surface of the valve base (100) and the outer wall surface of the exhaust valve body (200).
  14. 14. A battery safety valve according to claim 9, wherein the valve seat (100) is fitted with a valve cover (500), the valve cover (500) sealing off the port of the upper chamber region (140), and the valve cover (500) is fitted with a rupture disc (510).
  15. 15. A battery safety valve according to claim 14, wherein the rupture disc (510) is provided as an alumina member having venting micropores.
  16. 16. A battery safety valve according to claim 14, wherein an annular clamping groove (160) is formed in an end face of the valve seat (100) corresponding to the upper cavity area (140), the valve cover (500) is provided with an annular clamping block (520), and the annular clamping block (520) is embedded in the annular clamping groove (160).
  17. 17. A battery safety valve according to claim 9, wherein the valve seat (100) is provided with a bottom cover (600), the bottom cover (600) seals the port of the lower cavity region (150), an air inlet gap (190) is arranged at one end face of the valve seat (100) corresponding to the lower cavity region (150), and the lower cavity region (150) can be communicated with the inside of the battery through the air inlet gap (190).
  18. 18. A battery safety valve according to claim 1, wherein the outer wall surface of the valve seat (100) is provided with a catch (180).
  19. 19. A battery safety valve according to claim 18, wherein the valve seat (100) is formed as an ABS plastic part or a polypropylene plastic part or a polyphenylene oxide plastic part or a polyphenylene sulfide plastic part or a high impact polystyrene plastic part.
  20. 20. A lead acid battery comprising a battery safety valve according to any one of claims 1 to 19, and further comprising a battery body to which the valve seat (100) is connected by means of a snap (180).

Description

Battery relief valve and lead-acid storage battery Technical Field The utility model belongs to the technical field of storage battery safety valves, and relates to a battery safety valve and a lead-acid storage battery. Background Lead-acid batteries are an important secondary chemical source, and safety valves are an important component of such batteries, mainly playing a role in venting. During the charging process, the lead-acid storage battery can generate the reaction of electrolyzed water, and the electrolyzed water is decomposed into hydrogen and oxygen, so that the water content in the battery is reduced and the pressure is increased. When the internal pressure of the battery exceeds a set safety value, the safety valve is opened to exhaust gas to prevent the battery from bursting. For example, the utility model patent with the application number of CN201621193448.0 is named as a safety valve of a high-temperature valve-controlled sealed lead-acid storage battery, the safety valve belongs to a plunger type structure, a rubber plunger is arranged in a valve seat of the safety valve, the bottom of the rubber plunger seals an inlet of the valve seat, when the internal pressure of the storage battery reaches a threshold value, high-pressure gas forces the rubber plunger to compress and deform, so that the bottom of the rubber plunger is separated from an outlet of the valve seat, the high-pressure gas can be discharged from a gap between the rubber plunger and the valve seat to reduce the internal pressure of the battery, and when the internal pressure of the storage battery is smaller than the threshold value, the rubber plunger seals the inlet of the valve seat again under the self elastic action. The plunger type safety valve mainly depends on the compression characteristic of a rubber plunger, and the safety valve is in an acidic working environment, so the rubber plunger is made of acid-resistant rubber (such as chloroprene rubber and ethylene propylene diene monomer), the compression deformation rate of the acid-resistant rubber is relatively poor (the creep deformation of the rubber is large), the compression deformation rate of the acid-resistant rubber is gradually reduced along with the time in the long-term use process, the opening and closing pressure threshold value of the safety valve is continuously reduced, and the safety valve is not in accordance with the design requirement value. In order to ensure that the plunger type safety valve still can meet the design requirement after being used for a long time, the initial opening and closing pressure threshold of the safety valve is designed to be very high, so that the plunger type safety valve still can meet the design requirement under the condition that the plunger rubber loses part of compression deformation rate after being used for a long time. When the battery is actually used, part of the batteries are used, negative pressure is adopted in the early stage, positive pressure is adopted in the later stage, and once the batteries are overcharged, the gas in the batteries cannot be discharged in time due to the fact that the initial opening and closing pressure threshold value of the safety valve is higher, so that the battery shell is expanded, and the batteries cannot be discharged and are out of control. For the above reasons, there are some cap-type safety valves, such as the one of patent application CN200710114374.6, named as a safety valve for lead-acid battery, which has a rubber cap that seals a vent, and when the internal pressure of the battery reaches a threshold value, the high-pressure gas forces the rubber cap to stretch and deform, so as to leave the safety valve through the vent. The safety valve mainly utilizes the stretching characteristic of the rubber cap, and the stretching characteristic of the rubber material is superior to the compression characteristic, so that the cap type safety valve has longer service life, even if the safety valve is used for a long time, the rubber cap only loses a small amount of stretching deformation rate, and the safety valve can still meet the design requirement after being used for a long time. More importantly, the cap-type safety valve has small change of the opening and closing pressure threshold value of the rubber cap during the whole service life, and has very stable working performance. However, in the above-mentioned lead acid battery relief valve, laminating together through the mode of face contact between the inner wall face of rubber cap and the outer wall face of exhaust nozzle, lead to the rubber cap to glue with the outer wall face adhesion of exhaust nozzle easily, the condition that the rubber cap opened the difficulty appears easily when the battery internal pressure reached and opens the threshold value, and then lead to the opening pressure threshold value of relief valve to be bigger than the design value to the difference of opening threshold value and closed