Battery sealing device

Abstract

The application provides a battery sealing device, which comprises a compression ring, a communication head, a sealing outer ring and a sealing inner ring, the compression ring is arranged in a lifting manner, the lower surface of the compression ring is provided with an annular liquid injection groove, the communication head is arranged on the compression ring and communicates with the annular liquid injection groove, the sealing outer ring is arranged on the compression ring, the lower surface of the sealing outer ring is lower than the lower surface of the compression ring in a natural state, the sealing inner ring is arranged on the compression ring, the sealing inner ring is located in the sealing outer ring, the lower surface of the sealing inner ring is lower than the lower surface of the compression ring in a natural state, and the annular liquid injection groove is located in an annular region formed by the sealing inner ring and the sealing outer ring, wherein the annular liquid injection groove is used for communicating with a liquid injection hole of a battery, the lower surface of the compression ring, the lower surface of the sealing inner ring and the lower surface of the sealing outer ring are all used for abutting against the end surface of the battery to seal the annular liquid injection groove. By adopting the scheme, the operation efficiency can be improved, the sealing performance is good, and the leakage of electrolyte is avoided.

Description

Technical Field

[0001] This invention relates to the field of battery liquid filling technology, and more specifically, to a battery sealing device. Background Technology

[0002] Cylindrical lithium batteries with electrolyte filling holes require a sealed connection (i.e., simultaneous connection and sealing) between the filling hole and the filling tube (or the formation vent pipe) during electrolyte filling and open formation processes. Otherwise, electrolyte leakage will occur. Existing sealing methods require the filling hole to be aligned with the filling tube (or the filling tube) or the formation vent pipe, which is complex and affects production efficiency. Summary of the Invention

[0003] This invention provides a battery sealing device to facilitate sealing and connecting the battery's electrolyte filling hole.

[0004] To achieve the above objectives, the present invention provides a battery sealing device, comprising: a pressure ring, which is vertically and movably disposed, the lower surface of the pressure ring having an annular injection groove; a connecting head disposed on the pressure ring, the connecting head communicating with the annular injection groove; a sealing outer ring disposed on the pressure ring, the lower surface of the sealing outer ring being lower than the lower surface of the pressure ring in its natural state; and a sealing inner ring disposed on the pressure ring, the sealing inner ring being located inside the sealing outer ring, the lower surface of the sealing inner ring being lower than the lower surface of the pressure ring in its natural state, the annular injection groove being located within an annular area formed by the sealing inner ring and the sealing outer ring; wherein the annular injection groove is used to communicate with the battery's injection hole, and the lower surfaces of the pressure ring, the sealing inner ring, and the sealing outer ring are all used to abut against the end face of the battery to seal the annular injection groove.

[0005] Furthermore, the outer wall of the pressure ring has an outer annular groove, and the sealing outer ring includes an outer ring body and an outer limiting ring disposed inside the outer ring body, the outer limiting ring being engaged in the outer annular groove; and / or, the inner wall of the pressure ring has an inner annular groove, and the sealing inner ring includes an inner ring body and an inner limiting ring disposed outside the inner ring body, the inner limiting ring being engaged in the inner annular groove.

[0006] Furthermore, the battery sealing device further includes: an outer sleeve fitted on the pressure ring, the inner wall of the outer sleeve engaging with the outer wall of the sealing outer ring; and an inner sleeve passing through the pressure ring, the outer wall of the inner sleeve engaging with the inner wall of the sealing inner ring.

[0007] Furthermore, the outer sleeve is axially movable relative to the pressure ring, and the inner sleeve is axially movable relative to the pressure ring. The battery sealing device further includes an elastic structure disposed on the pressure ring. The elastic structure cooperates with the outer sleeve and the inner sleeve to apply a downward elastic force to the outer sleeve and the inner sleeve.

[0008] Furthermore, the elastic structure includes a connecting piece and a first spring piece and a second spring piece disposed on the connecting piece, wherein the connecting piece and the pressure ring are fixedly connected, the first spring piece abuts against the upper end of the outer sleeve, and the second spring piece abuts against the upper end of the inner sleeve.

[0009] Furthermore, the upper surface of the pressure ring has a limiting groove, the connecting piece is located in the limiting groove, and the side wall of the limiting groove and the side wall of the connecting piece are in a stop-fitting relationship.

[0010] Furthermore, there are multiple elastic structures, which are distributed circumferentially along the pressure ring.

[0011] Furthermore, the outer wall of the pressure ring has an outer annular step, and the outer sleeve includes an outer sleeve body and an outer stop ring disposed inside the outer sleeve body, the outer stop ring and the outer annular step cooperating; and / or, the inner wall of the pressure ring has an inner annular step, and the inner sleeve includes an inner sleeve body and an inner stop ring disposed outside the inner sleeve body, the inner stop ring and the inner annular step cooperating.

[0012] Furthermore, the connecting head protrudes from the upper surface of the pressure ring, the pressure ring has a channel connecting the connecting head and the annular injection groove, and the outer wall of the connecting head has an annular limiting rib.

[0013] Furthermore, the battery sealing device also includes a bracket, which is fixedly connected to the pressure ring, and the bracket is used to connect to the drive mechanism.

[0014] The present invention provides a battery sealing device comprising a pressure ring, a connecting head, a sealing outer ring, and a sealing inner ring. The pressure ring is vertically detachable, and its lower surface has an annular injection groove. The connecting head is disposed on the pressure ring and communicates with the annular injection groove. The sealing outer ring is disposed on the pressure ring, and its lower surface is lower than that of the pressure ring in its natural state. The sealing inner ring is disposed on the pressure ring, located inside the sealing outer ring, and its lower surface is lower than that of the pressure ring in its natural state. The annular injection groove is located within the annular area formed by the sealing inner and outer rings. The annular injection groove communicates with the battery's injection port. The lower surfaces of the pressure ring, the sealing inner ring, and the sealing outer ring all abut against the end face of the battery to seal the annular injection groove. Using this solution, pressing the pressure ring onto the battery and simply covering the injection port with the annular injection groove achieves communication between the annular injection groove and the injection port, eliminating the need for precise alignment and thus improving operational efficiency. Furthermore, the annular injection tank can be sealed by the outer and inner sealing rings on both sides, thus preventing electrolyte leakage. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0016] Figure 1 An exploded view of a battery sealing device provided in an embodiment of the present invention is shown;

[0017] Figure 2 It shows Figure 1 A schematic diagram of the battery sealing device and the battery after alignment.

[0018] Figure 3 It shows Figure 2 A sectional view;

[0019] Figure 4 It shows Figure 2 A schematic diagram showing the battery sealing device being pressed down and engaging with the battery seal.

[0020] Figure 5 It shows Figure 4 A sectional view.

[0021] The above figures include the following reference numerals:

[0022] 10. Pressure ring; 11. Annular injection groove; 12. Outer annular groove; 13. Inner annular groove; 14. Limiting groove; 15. Outer annular step; 16. Inner annular step; 20. Connecting head; 30. Sealing outer ring; 40. Sealing inner ring; 50. Outer sleeve; 60. Inner sleeve; 70. Elastic structure; 71. Connecting piece; 72. First spring piece; 73. Second spring piece; 80. Support. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] like Figures 1 to 5 As shown, an embodiment of the present invention provides a battery sealing device, comprising: a pressure ring 10, which is movably and vertically disposed, the lower surface of the pressure ring 10 having an annular injection groove 11; a connecting head 20 disposed on the pressure ring 10, the connecting head 20 communicating with the annular injection groove 11; a sealing outer ring 30 disposed on the pressure ring 10, the lower surface of the sealing outer ring 30 being lower than the lower surface of the pressure ring 10 in its natural state; and a sealing inner ring 40 disposed on the pressure ring 10, the sealing inner ring 40 being located inside the sealing outer ring 30, the lower surface of the sealing inner ring 40 being lower than the lower surface of the pressure ring 10 in its natural state, the annular injection groove 11 being located within the annular area formed by the sealing inner ring 40 and the sealing outer ring 30; wherein, the annular injection groove 11 is used to communicate with the injection hole of the battery, and the lower surfaces of the pressure ring 10, the sealing inner ring 40, and the sealing outer ring 30 are all used to abut against the end face of the battery to seal the annular injection groove 11. The lower surfaces of the inner sealing ring 40 and the outer sealing ring 30 are compressed after they come into contact with the end face of the battery, thus achieving a seal.

[0025] Using this design, when the battery requires electrolyte injection or open formation, the pressure ring 10 is pressed down onto the battery. Simply covering the injection hole with the annular injection groove 11 achieves communication between the annular injection groove 11 and the injection hole, eliminating the need for precise alignment and thus improving operational efficiency. Furthermore, the annular injection groove 11 is sealed by the outer sealing ring 30 and the inner sealing ring 40 on both sides, preventing electrolyte leakage. The connector 20 is used to connect to other pipelines for operations such as electrolyte injection.

[0026] In this embodiment, the outer wall of the pressure ring 10 has an outer annular groove 12, and the sealing outer ring 30 includes an outer ring body and an outer limiting ring disposed inside the outer ring body, the outer limiting ring being engaged in the outer annular groove 12; and / or, the inner wall of the pressure ring 10 has an inner annular groove 13, and the sealing inner ring 40 includes an inner ring body and an inner limiting ring disposed outside the inner ring body, the inner limiting ring being engaged in the inner annular groove 13. This allows for the limiting of the sealing outer ring 30 or the sealing inner ring 40, preventing the sealing outer ring 30 and the sealing inner ring 40 from moving up and down, thus ensuring a sealing effect.

[0027] In this embodiment, the battery sealing device further includes: an outer sleeve 50, which is fitted onto the pressure ring 10, and the inner wall of the outer sleeve 50 mates with the outer wall of the sealing outer ring 30; and an inner sleeve 60, which passes through the pressure ring 10, and the outer wall of the inner sleeve 60 mates with the inner wall of the sealing inner ring 40. The outer sleeve 50 and the inner sleeve 60 can limit the radial movement of the sealing outer ring 30 and the sealing inner ring 40, ensuring that the sealing outer ring 30 and the sealing inner ring 40 can only be compressed axially under pressure, thus guaranteeing a sealing effect. Both the outer sleeve 50 and the inner sleeve 60 are made of metal.

[0028] In this embodiment, the outer sleeve 50 is axially movable relative to the pressure ring 10, and the inner sleeve 60 is also axially movable relative to the pressure ring 10. The battery sealing device further includes an elastic structure 70 disposed on the pressure ring 10. The elastic structure 70 cooperates with the outer sleeve 50 and the inner sleeve 60 to apply a downward elastic force to the outer sleeve 50 and the inner sleeve 60. With this configuration, after the outer sleeve 50 and the inner sleeve 60 contact the upper end of the battery, they will not move downwards during the continued downward pressure on the pressure ring 10. This avoids pressing the battery against the pressure ring, and the pressure ring 10 continues to move downwards until its lower surface contacts the battery, achieving a seal.

[0029] In this embodiment, the elastic structure 70 includes a connecting piece 71 and a first spring piece 72 and a second spring piece 73 disposed on the connecting piece 71. The connecting piece 71 is fixedly connected to the pressure ring 10. The first spring piece 72 abuts against the upper end of the outer sleeve 50, and the second spring piece 73 abuts against the upper end of the inner sleeve 60. Both the first spring piece 72 and the second spring piece 73 can undergo elastic deformation, which can both limit the axial movement of the outer sleeve 50 and the inner sleeve 60 and ensure the axial movement allowance of the outer sleeve 50 and the inner sleeve 60. The connecting piece 71 and the pressure ring 10 are connected by fasteners.

[0030] In this embodiment, the upper surface of the pressure ring 10 has a limiting groove 14, and the connecting piece 71 is located in the limiting groove 14. The side wall of the limiting groove 14 and the side wall of the connecting piece 71 stop and cooperate. With this setting, the positioning and installation of the elastic structure 70 can be facilitated, and the circumferential direction of the elastic structure 70 can be limited to prevent the elastic structure 70 from rotating.

[0031] In this embodiment, there are multiple elastic structures 70, which are distributed circumferentially along the pressure ring 10. This allows for better positioning of the outer sleeve 50 and the inner sleeve 60.

[0032] In this embodiment, the outer wall of the pressure ring 10 has an outer annular step 15, and the outer sleeve 50 includes an outer sleeve body and an outer stop ring disposed inside the outer sleeve body, the outer stop ring and the outer annular step 15 cooperating; and / or, the inner wall of the pressure ring 10 has an inner annular step 16, and the inner sleeve 60 includes an inner sleeve body and an inner stop ring disposed outside the inner sleeve body, the inner stop ring and the inner annular step 16 cooperating. The axial movement of the outer sleeve 50 can be limited by the cooperation of the outer annular step 15 and the outer stop ring, and the axial movement of the inner sleeve 60 can be limited by the cooperation of the inner annular step 16 and the inner stop ring.

[0033] In this embodiment, the connecting head 20 protrudes from the upper surface of the pressure ring 10, and the pressure ring 10 has a channel connecting the connecting head 20 and the annular injection groove 11. The outer wall of the connecting head 20 has an annular limiting rib. This facilitates the connection of the connecting head 20 to other pipelines and ensures a reliable connection.

[0034] In this embodiment, the battery sealing device further includes a bracket 80, which is fixedly connected to the pressure ring 10. The bracket 80 is used to connect to a drive mechanism so that the battery sealing device can be moved up and down by the drive mechanism. For example, the bracket 80 is connected to a cylinder, motor, etc.

[0035] Currently, common solutions for aligning the injection hole in the industry include: 1) Making the injection hole into an externally threaded tube, with the internally threaded tube at the end of the injection tube or formation vent tube screwed tightly to it, and a sealing gasket placed in the middle to achieve a seal; this solution is time-consuming, complex to operate, and involves complex battery structures. 2) Setting positioning holes on the battery cover to fix the circumferential position of the battery injection hole to align with the injection tube or formation vent tube, with a sealing ring installed at the end of the injection tube or formation vent tube, pressing vertically around the injection hole to achieve a seal; this solution requires rotating the battery to align the battery positioning hole with the positioning post. 3) Setting the injection hole in the center of the cover, with a sealing ring installed at the end of the injection tube or formation vent tube, pressing vertically around the injection hole to achieve a seal; however, the center of the cover is often a welding area, and the thermal deformation during laser welding can damage the seal of the injection hole. Furthermore, excessive radial deformation of the sealing ring under vertical pressure can easily lead to seal failure and leakage.

[0036] This solution employs a double-ring annular seal, offering convenient operation without the need for tightening threads or fixing the circumferential position of the battery filling hole. It avoids the central welding position, preventing thermal deformation during laser welding from damaging the filling hole's seal. Under vertical pressure, the sealing ring exhibits no radial deformation, preventing seal failure and leakage.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A battery sealing device, characterized in that, include: The pressure ring (10) is vertically adjustable, and the lower surface of the pressure ring (10) has an annular injection groove (11). A connecting head (20) is provided on the pressure ring (10), and the connecting head (20) is connected to the annular injection groove (11); A sealing outer ring (30) is disposed on the pressure ring (10), and the lower surface of the sealing outer ring (30) is lower than the lower surface of the pressure ring (10) in its natural state; A sealing inner ring (40) is disposed on the pressure ring (10). The sealing inner ring (40) is located inside the sealing outer ring (30). In its natural state, the lower surface of the sealing inner ring (40) is lower than the lower surface of the pressure ring (10). The annular injection groove (11) is located within the annular area formed by the sealing inner ring (40) and the sealing outer ring (30). The annular injection groove (11) is used to communicate with the injection hole of the battery. The lower surface of the pressure ring (10), the lower surface of the inner sealing ring (40) and the lower surface of the outer sealing ring (30) are all used to abut against the end face of the battery to seal the annular injection groove (11). The battery sealing device further includes: An outer sleeve (50) is fitted onto the pressure ring (10), and the inner wall of the outer sleeve (50) and the outer wall of the sealing outer ring (30) are fitted together. The inner sleeve (60) is inserted inside the pressure ring (10), and the outer wall of the inner sleeve (60) and the inner wall of the sealing inner ring (40) are engaged. The outer sleeve (50) is axially movable relative to the pressure ring (10), the inner sleeve (60) is axially movable relative to the pressure ring (10), and the battery sealing device further includes: An elastic structure (70) is disposed on the pressure ring (10). The elastic structure (70) cooperates with the outer sleeve (50) and the inner sleeve (60) to apply a downward elastic force to the outer sleeve (50) and the inner sleeve (60).

2. The battery sealing device according to claim 1, characterized in that, The outer wall of the pressure ring (10) has an outer annular groove (12), and the sealing outer ring (30) includes an outer ring body and an outer limiting ring disposed inside the outer ring body, the outer limiting ring being engaged in the outer annular groove (12); and / or, The inner wall of the pressure ring (10) has an inner annular groove (13), and the sealing inner ring (40) includes an inner ring body and an inner limiting ring disposed outside the inner ring body. The inner limiting ring is inserted into the inner annular groove (13).

3. The battery sealing device according to claim 1, characterized in that, The elastic structure (70) includes a connecting piece (71) and a first spring piece (72) and a second spring piece (73) disposed on the connecting piece (71), wherein the connecting piece (71) and the pressure ring (10) are fixedly connected, the first spring piece (72) abuts against the upper end of the outer sleeve (50), and the second spring piece (73) abuts against the upper end of the inner sleeve (60).

4. The battery sealing device according to claim 3, characterized in that, The upper surface of the pressure ring (10) has a limiting groove (14), and the connecting piece (71) is located in the limiting groove (14). The side wall of the limiting groove (14) and the side wall of the connecting piece (71) are in stop-fitting cooperation.

5. The battery sealing device according to claim 1, characterized in that, There are multiple elastic structures (70), and the multiple elastic structures (70) are distributed circumferentially along the pressure ring (10).

6. The battery sealing device according to claim 1, characterized in that, The outer wall of the pressure ring (10) has an outer annular step (15), and the outer sleeve (50) includes an outer sleeve and an outer stop ring disposed inside the outer sleeve, the outer stop ring and the outer annular step (15) cooperating; and / or, The inner wall of the pressure ring (10) has an inner annular step (16), and the inner sleeve (60) includes an inner sleeve body and an inner stop ring disposed on the outer side of the inner sleeve body. The inner stop ring and the inner annular step (16) cooperate.

7. The battery sealing device according to claim 1, characterized in that, The connecting head (20) protrudes from the upper surface of the pressure ring (10), and the pressure ring (10) has a channel connecting the connecting head (20) and the annular injection groove (11). The outer wall of the connecting head (20) has an annular limiting rib.

8. The battery sealing device according to claim 1, characterized in that, The battery sealing device also includes a bracket (80), which is fixedly connected to the pressure ring (10), and the bracket (80) is used to connect to the drive mechanism.

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