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CN-116519229-B - Plugging device, air tightness detection equipment and air tightness detection method

CN116519229BCN 116519229 BCN116519229 BCN 116519229BCN-116519229-B

Abstract

The application relates to a plugging device, air tightness detection equipment and an air tightness detection method, and belongs to the technical field of battery manufacturing. The plugging device is used for plugging a pressure release valve of a battery and comprises a valve body and a valve cover, the plugging device comprises a sealing cover, the sealing cover comprises a cover body and a separation part, the separation part divides the inner space of the cover body into a first cavity and a second cavity, the cover body is provided with a first opening end, the first opening end is used for being in sealing connection with the valve body, the second cavity is divided into a first subchamber and a second subchamber which are independent of each other by a piston, one end of the piston rod is connected with the piston, and a magnetic attraction piece is connected with the other end of the piston rod and used for adsorbing the valve cover and opening the valve cover under the drive of the piston, and the sealing cover is provided with a first inlet, a second inlet and a third inlet. The plugging device is simple in structure, convenient to operate and capable of improving the air tightness detection efficiency.

Inventors

  • ZHANG NING
  • ZHU DECHENG
  • ZHOU HAILUN
  • ZHONG HUIYING
  • LIAN DENGWEI

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20220120

Claims (17)

  1. 1. A plugging device for plugging a pressure relief valve of a battery, the pressure relief valve comprising a valve body and a valve cover, the plugging device comprising: the sealing cover comprises a cover body and a separation part, wherein the separation part is arranged in the cover body and divides the internal space of the cover body into a first cavity and a second cavity, the cover body is provided with a first opening end communicated with the first cavity, and the first opening end is used for being in sealing connection with the valve body; a piston movably arranged in the second chamber and dividing the second chamber into a first sub-chamber and a second sub-chamber which are independent of each other; A piston rod penetrating the partition part in a sealing manner, one end of the piston rod being connected to the piston, and The magnetic attraction piece is arranged in the first cavity and connected with the other end of the piston rod, and is used for adsorbing the valve cover and opening the valve cover under the drive of the piston; The sealing cover is provided with a first inlet for introducing pressure medium into the first subchamber, a second inlet for introducing pressure medium into the second subchamber and a third inlet for introducing pressure medium into the first subchamber; the piston is movably and hermetically matched with the inner wall of the second chamber; The piston rod is arranged in the second subchamber; The piston having a first position proximate the first open end and a second position distal from the first open end, the magnetic element being capable of absorbing the valve cover when the piston is in the first position and being capable of opening the valve cover when the piston is moved from the first position toward the second position; The piston is configured to be driven towards the first open end by pressure medium located in the first subchamber when the pressure in the first subchamber is greater than the pressure in the second subchamber to enable the piston to move to the first position, and to be driven away from the first open end by pressure medium located in the second subchamber when the pressure in the second subchamber is greater than the pressure in the first subchamber to enable the piston to move to the second position.
  2. 2. The occlusion device of claim 1, wherein said third inlet is configured to be vented with said pressure medium after said valve cap is opened to charge pressure medium into said battery.
  3. 3. The occlusion device of claim 1, wherein said cap includes a body and a cover, said first open end disposed in said body, said body further having a second open end disposed opposite said first open end along an axial direction of said body, said cover covering said second open end, said divider disposed in said body, said divider and said cover defining said second chamber therebetween.
  4. 4. The occlusion device of claim 3, wherein said first inlet is disposed in said cover, and said second inlet and said third inlet are disposed in said body.
  5. 5. The occlusion device of claim 3, wherein said cover is movably connected to and sealingly engaged with said body in an axial direction of said body; The occlusion device further comprises: The clamping pieces are distributed around the body along the circumferential direction of the body, are linked with the covering piece and are configured to be close to each other when the covering piece moves relative to the body in a direction away from the first opening end so as to clamp the valve body.
  6. 6. The occlusion device of claim 5, wherein said clip is movably coupled to said body in a radial direction of said body; The occlusion device further comprises: And the transmission piece is fixed on the covering piece and forms inclined plane fit with the clamping piece.
  7. 7. The occlusion device of claim 6 wherein the occlusion device comprises a flexible member, characterized in that the occlusion device further comprises: and the elastic piece is used for applying a force to the clamping piece along the radial direction of the body so as to enable the clamping piece to be abutted with the transmission piece.
  8. 8. The plugging device of claim 6, wherein the clamping member is provided with a through hole, one end of the transmission member is connected to the covering member, the other end of the transmission member is disposed through the through hole, and the transmission member is provided with a first inclined surface for abutting against a wall of the through hole.
  9. 9. The plugging device of claim 8, wherein an end of the driving member remote from the cover member is provided with a stopper portion for restricting the driving member from being detached from the through hole.
  10. 10. The plugging device of claim 6, wherein the body has at least two guide holes corresponding to the at least two clamping members, the guide holes extending in a radial direction of the body, the clamping members including a first arm portion and a second arm portion, the first arm portion being inserted into the guide holes, one end of the second arm portion being connected to the first arm portion, and the other end of the second arm portion being formed with a clamping portion for cooperation with a clamping groove of the valve body.
  11. 11. The occlusion device of claim 10, wherein said clip portion has a second sloped surface for forming a sloped fit with a wall of said clip groove.
  12. 12. The occlusion device of any of claims 1-11, wherein said magnetic attraction member is an electromagnet.
  13. 13. The occlusion device of any of claims 1-11, wherein said occlusion device further comprises: and the detection unit is arranged in the first cavity and is used for detecting the displacement of the valve cover.
  14. 14. The occlusion device of any of claims 1-11, wherein said occlusion device further comprises: and the locating pin is fixed on the cover body and is used for being inserted into the locating hole of the valve body.
  15. 15. The occlusion device of any of claims 1-11, wherein said first open end is provided with a first seal to sealingly connect said first open end to said valve body.
  16. 16. An air tightness detection apparatus for detecting air tightness of a battery, the air tightness detection apparatus comprising: The occlusion device of any of claims 1-15; A first pressure supply mechanism connected to the first inlet for supplying a pressure medium to the first subchamber; a second pressure supply mechanism connected to the second inlet for supplying a pressure medium to the second sub-chamber; And a third pressure providing mechanism connected with the third inlet and used for leading pressure medium into the first chamber.
  17. 17. A method of detecting the air tightness of a battery using the plugging device according to any of claims 1 to 15, wherein the method of detecting the air tightness comprises: Providing a plugging device, wherein the plugging device comprises a sealing cover, a piston rod and a magnetic attraction piece; The first opening end is in sealing connection with a valve body of a pressure release valve arranged on the battery; Introducing pressure medium into the first subchamber through the first inlet, and moving the piston towards the valve body when the pressure in the first subchamber is higher than the pressure in the second subchamber so that the magnetic attraction piece can adsorb the valve cover of the pressure release valve under the drive of the piston; introducing pressure medium into the second subchamber through the second inlet, and when the pressure in the second subchamber is greater than the pressure in the first subchamber, moving the piston towards a direction away from the valve body so that the magnetic attraction piece can open the valve cover under the drive of the piston to keep the valve cover open; introducing pressure medium into the first cavity through the third inlet so as to enable the pressure medium to enter the battery through the pressure relief valve; A change in pressure within the first chamber over a preset time is detected.

Description

Plugging device, air tightness detection equipment and air tightness detection method Technical Field The application relates to the technical field of battery manufacturing, in particular to a plugging device, air tightness detection equipment and an air tightness detection method. Background Energy conservation and emission reduction are key to sustainable development of the automobile industry. Under the condition, the new energy electric automobile becomes an important component for sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. The battery is used as the core of the new energy electric automobile, and the safety and the working reliability of the battery are important. In order to ensure safe and stable operation, the battery needs to be waterproof and dustproof, i.e. the battery needs to meet the sealing requirement. In the battery manufacturing process, the tightness of the battery needs to be detected, and an air tightness detection mode is generally adopted. In order to realize the air tightness detection of the battery, a detection port communicated with the inside of the battery is generally required to be arranged on the box body of the battery, and a pressure medium is introduced into the battery from the detection port to carry out the air tightness detection. In the prior art, when the air tightness of the battery is detected, besides the pressure release valve of the battery is plugged, the detection port is also required to be plugged, so that the pressure release of the detection port is avoided, and the detection precision is influenced. But plugging device structure is complicated, and complex operation influences the efficiency that the gas tightness detected. Disclosure of Invention The application aims to provide a plugging device, air tightness detection equipment and an air tightness detection method. The plugging device is simple in structure, convenient to operate and capable of improving the air tightness detection efficiency. The application is realized by the following technical scheme: The application provides a plugging device, which comprises a valve body and a valve cover, wherein the plugging device comprises a sealing cover, a piston rod and a magnetic suction piece, the sealing cover comprises a cover body and a partition part, the partition part is arranged in the cover body and divides the internal space of the cover body into a first cavity and a second cavity, the cover body is provided with a first opening end communicated with the first cavity and used for being in sealing connection with the valve body, the piston is movably arranged in the second cavity and divides the second cavity into a first subchamber and a second subchamber which are independent from each other, the piston rod is arranged in the partition part in a penetrating mode, one end of the piston rod is connected with the piston, the magnetic suction piece is arranged in the first cavity and connected with the other end of the piston rod and used for sucking the valve cover and opening the valve cover under the driving of the piston, and the sealing cover is provided with a first inlet used for leading in pressure medium to the first subchamber, a second subchamber and a third medium. According to the plugging device, the first chamber is a closed chamber through the sealed connection of the first opening end and the valve body, the pressure medium is introduced into the first sub-chamber through the first inlet, the pressure in the first sub-chamber is larger than the pressure in the second sub-chamber, the piston can move towards the valve body under the action of the pressure medium in the first chamber, the magnetic part arranged at one end, far away from the piston, of the piston rod can absorb the valve cover under the drive of the piston, the pressure medium is introduced into the second sub-chamber through the second inlet, the pressure in the second sub-chamber is larger than the pressure in the first sub-chamber, the piston can move towards the direction away from the valve body under the action of the pressure medium in the second sub-chamber, the valve cover can be opened under the drive of the piston, the pressure medium is introduced into the first chamber through the third inlet, after the valve cover is opened, the pressure in the first chamber can enter the interior of the battery through the valve cover under the drive of the sealed connection of the first opening end and the valve body, and the plugging of the pressure release valve can be achieved, namely the pressure in the first chamber can be detected as the pressure in the interior of the battery, and the air tightness of the battery can be detected. This plugging device can realize the detection to battery gas tightness with the help of the relief valve, need not to set up the detection mouth to the battery trompil in addition, simple structure, t