Riveting liquid injection structure

Abstract

The utility model relates to a pull rivet liquid injection hole structure which comprises a top cover piece, sealing plastic and a pull rivet, the sealing plastic is used for connecting the top cover piece and the pull rivet, and a groove of a liquid injection opening of the top cover piece is matched and fixed with a boss on the sealing plastic, so that matching among the pull rivet, the sealing plastic and the liquid injection opening has enough strength. And the sealing effect of the liquid injection port can be ensured to isolate the outside from the inside of the battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of battery liquid filling port sealing, in particular to a sealing structure of a liquid filling port. Background Art

[0002] Lithium-ion batteries have become the preferred battery for portable electronic products, electric vehicles, and energy storage due to their advantages such as high capacity density, high specific energy, and long cycle life, and have been increasingly widely used. In addition to the advantages of high capacity, batteries should also have good safety and long cycle life to meet usage standards and meet people's needs.

[0003] In the prior art, after the battery cell is filled with liquid, the liquid filling port is sealed by laser welding the sealing pin and the liquid filling port of the top cover piece together. However, the laser welding method has relatively high requirements for the liquid filling port and the sealing pin, and the welding is prone to explosion points during the production process, and the sealing pin is prone to cracks during long-term use.

[0004] Patent document CN216354673U discloses a sealing structure for a liquid injection hole. By configuring the rivet hole as a blind hole with its opening facing outward, the rivet is pulled outward, squeezing the rivet to seal the injection hole. This effectively prevents the electrolyte solution in the main body of a prismatic battery from leaking out of the rivet hole, resulting in a highly reliable seal. However, the connection between the rivet and the top cover is not stable and could fall off when the rivet is pulled outward, making it easy for the electrolyte solution to leak out.

[0005] Patent document CN214706065U discloses a rivet structure solution, but in this structure, the sealing ring is in direct contact with the outside world over a large area, which is easy to corrode the sealing ring and reduce the service life of the sealing ring. Moreover, the rivet is made of metal and the top cover is also made of metal. When riveting, the lower part is in direct contact and it is very easy for metal debris to fall into the battery cell, posing a serious safety risk. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a rivet injection structure to solve the above problems.

[0007] The utility model provides the following technical solutions:

[0008] A rivet liquid injection structure, applied to batteries, includes a top cover sheet and a rivet; the top cover sheet is provided with a liquid injection port, the rivet includes a rivet rod and a rivet head, the rivet is placed in the liquid injection port, the rivet liquid injection structure also includes a sealing plastic, the top cover sheet is also provided with a groove, and the sealing plastic is provided with a boss used in conjunction with the groove; the rivet head, sealing plastic and liquid injection port are sealed and fixed.

[0009] Furthermore, a first through hole is provided at the top of the liquid injection port, and a second through hole is provided at the bottom. The diameter of the first through hole is larger than the diameter of the second through hole, and the bottom of the first through hole is used to place the head of the nail head; the bottom of the sealing plastic is cylindrical, and a third through hole is provided at the center. The diameter of the third through hole is consistent with the diameter of the second through hole of the liquid injection port.

[0010] Furthermore, the height of the boss is smaller than the depth of the liquid injection port groove; the side of the sealing plastic is annular, and the groove is annular.

[0011] Furthermore, the top cover sheet is provided with a flange at the bottom, the groove includes a first groove provided at the bottom of the flange of the top cover sheet, and the boss includes a first boss provided at the bottom of the sealing plastic and matching with the first groove; the groove includes a second groove provided at the side of the flange of the top cover sheet, and the boss includes a second boss provided at the side of the sealing plastic and matching with the second groove; the groove includes an annular L-shaped third groove provided at the top of the side of the flange of the top cover sheet, and the boss includes a third L-shaped boss provided at the top of the side of the sealing plastic and matching with the third groove.

[0012] The present invention has the following beneficial technical effects: compared with the existing technology, the first boss of the sealing plastic cooperates with the first groove of the top cover sheet, which can radially limit the sealing plastic and prevent the sealing plastic from radially offset during assembly and riveting; the second boss of the sealing plastic cooperates with the second groove of the top cover sheet to ensure that the bottom of the liquid injection port of the top cover sheet is tightly fitted with the sealing plastic, thereby ensuring the riveting effect; the third L-shaped boss of the sealing plastic cooperates with the annular L-shaped third groove of the top cover sheet, and the L-shaped design can ensure that the sealing plastic can be stuck on the liquid injection port, ensuring that the sealing plastic falls into the internal space of the battery cell; through the arrangement of the present invention, after riveting, the cooperation between the rivet, the sealing plastic and the liquid injection port has sufficient strength, and can ensure the sealing effect of the liquid injection port, isolating the outside from the inside of the battery cell; it can avoid the welding slag generated by existing laser welding and the potential risks of welding explosion points and cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the battery core riveting structure of the utility model.

[0014] Figure 2 It is a cross-sectional view of the liquid injection structure before riveting in an embodiment of the present utility model.

[0015] Figure 3 It is a cross-sectional view of the liquid injection structure after riveting in an embodiment of the present utility model.

[0016] Figure 4 It is a cross-sectional view of the liquid injection structure of the top cover sheet in the embodiment of the present utility model.

[0017] Figure 5 It is a cross-sectional view of the sealing plastic in the embodiment of the present utility model.

[0018] Figure 6 It is a three-dimensional structural diagram of the sealing plastic in the embodiment of the present utility model.

[0019] Figure 7 This is a cross-sectional view of the closed rivet structure in an embodiment of the present utility model.

[0020] The reference numerals in the figures are:

[0021] 1-top cover plate; 11-first through hole; 12-second through hole; 13-first groove; 14-second groove; 15-third groove; 2-sealing plastic; 21-third through hole; 22-first boss; 23-second boss; 24-third boss; 3-rivet; 31-nail rod; 32-nail head. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example

[0024] A rivet injection structure is used in batteries, such as Figure 1 Part A in; see Figure 2-7 The rivet injection structure includes a top cover sheet 1 and a rivet 3; the top cover sheet 1 is provided with a liquid injection port, the rivet 3 includes a rivet rod 31 and a rivet head 32, the rivet 3 is placed in the liquid injection port, the rivet injection structure also includes a sealing plastic 2, the top cover sheet 1 is also provided with a groove, and the sealing plastic 2 is provided with a boss used in conjunction with the groove; the rivet head 32, the sealing plastic 2 and the liquid injection port are sealed and fixed.

[0025] In this embodiment, referring to Figure 2-4 The top of the liquid injection port is provided with a first through hole 11, and the bottom is provided with a second through hole 12. The diameter of the first through hole 11 is larger than the diameter of the second through hole 12. The bottom of the first through hole 11 is used to place the head of the nail head 32; Figure 5-6 The bottom of the sealing plastic 2 is cylindrical, and a third through hole 21 is provided in the center. The diameter of the third through hole 21 is consistent with the diameter of the second through hole 12 of the liquid injection port.

[0026] In this embodiment, the height of the boss is smaller than the depth of the liquid injection port groove; the side of the sealing plastic 2 is annular, and the groove is annular.

[0027] In this embodiment, referring to Figure 4-5 The top cover sheet 1 is provided with a flange at the bottom, and the groove includes a first groove 13 provided at the bottom of the flange of the top cover sheet 1, a second groove 14 on the side of the flange, and an annular L-shaped third groove 15 at the top of the side of the flange. The boss includes a first boss 22 provided at the bottom of the sealing plastic 2 and matching with the first groove; a second boss 22 provided on the side of the sealing plastic 2 and matching with the second groove 14; and a third L-shaped boss 24 provided at the top of the side of the sealing plastic 2 and matching with the third groove 15.

[0028] In this embodiment, the assembly process is as follows: place the first boss 22 of the sealing plastic in the first groove 13 of the top cover sheet, and open the remaining plastic parts → place the second boss 23 of the sealing plastic in the second groove 14 → place the third L-shaped boss 24 of the sealing plastic in the annular L-shaped third groove 15 (the first three steps are completed during the top cover assembly process) → fully weld the top cover and the aluminum shell → inject liquid → pass the rivet 3 through the first through hole 11 and the second through hole 12 of the liquid injection port → rivet → the nail rod 31 is pulled off, the riveting is completed, and the raised side wall of the nail head 32 is sealed with the sealing plastic and the liquid injection port.

[0029] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A rivet injection structure, applied to a battery, comprising a top cover sheet (1) and a rivet (3); the top cover sheet (1) is provided with a liquid injection port, the rivet (3) comprises a rivet rod (31) and a rivet head (32), and the rivet (3) is placed at the liquid injection port, characterized in that: The rivet injection structure further comprises a sealing plastic (2), the top cover sheet (1) is further provided with a groove, and the sealing plastic (2) is provided with a boss used in conjunction with the groove; the nail head (32), the sealing plastic (2) and the injection port are sealed and fixed.

2. A rivet injection structure according to claim 1, characterized in that: The top of the liquid injection port is provided with a first through hole (11), and the bottom is provided with a second through hole (12); the diameter of the first through hole (11) is larger than that of the second through hole (12); and the bottom of the first through hole (11) is used to place the head of a nail head (32).

3. The rivet liquid injection structure according to claim 2, characterized in that: The bottom of the sealing plastic (2) is cylindrical, and a third through hole (21) is provided at the center. The diameter of the third through hole (21) is consistent with the diameter of the second through hole (12) of the liquid injection port.

4. The rivet liquid injection structure according to claim 3, characterized in that: The height of the boss is smaller than the depth of the liquid injection port groove.

5. The rivet liquid injection structure according to claim 4, characterized in that: The side of the sealing plastic (2) is in a circular ring shape, and the groove is in a ring shape.

6. The rivet liquid injection structure according to claim 5, characterized in that: The bottom of the top cover sheet (1) is provided with a flange.

7. The rivet liquid injection structure according to claim 6, characterized in that: The groove comprises a first groove (13) arranged at the bottom of the flange of the top cover sheet (1), and the boss comprises a first boss (22) arranged at the bottom of the sealing plastic (2) and matched with the first groove.

8. The rivet liquid injection structure according to claim 7, characterized in that: The groove includes a second groove (14) arranged on the flange side of the top cover sheet (1), and the boss includes a second boss (23) arranged on the side of the sealing plastic (2) and matched with the second groove (14).

9. The rivet liquid injection structure according to claim 8, characterized in that: The groove comprises an annular L-shaped third groove (15) arranged at the top of the flange side of the top cover sheet (1), and the boss comprises a third L-shaped boss (24) arranged at the top of the side of the sealing plastic (2) and matched with the third groove (15).

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