CN219267773U

CN219267773U - Lithium battery top cover structure

Info

Publication number: CN219267773U
Application number: CN202222467958.4U
Authority: CN
Inventors: 蒋海斌; 夏传斌; 王云鹤; 程媛媛; 刘宁
Original assignee: Changzhou Zhenyu New Energy Technology Co ltd
Current assignee: Changzhou Zhenyu New Energy Technology Co ltd
Priority date: 2022-09-16
Filing date: 2022-09-16
Publication date: 2023-06-27
Anticipated expiration: 2032-09-16

Abstract

The utility model discloses a top cover structure of a lithium battery, which comprises a cover plate piece, a lower plastic plate, a pole column and a sealing ring structure, wherein the cover plate piece is communicated with a mounting hole, the lower plastic plate is communicated with a sealing hole, the top of the pole column penetrates through the sealing hole and is inserted into the mounting hole, a mounting plate is arranged at the bottom of the pole column, the mounting hole, the sealing hole, the pole column and the mounting plate form a matched cavity, the sealing ring structure comprises a first sealing ring and a second sealing ring, the first sealing ring is positioned in the matched cavity, the second sealing ring is positioned above the first sealing ring, a pressing piece is inserted into the mounting hole, the pressing piece is communicated with a clamping hole for clamping the pole column, at least two blocking blocks are arranged on the inner hole wall at the top of the clamping hole, and an extrusion ring for inserting the pole column is arranged at the bottom of the pressing piece. The lithium battery cover plate structure is simple to assemble, and the sealing ring is prevented from being extruded excessively to generate mechanical damage by limiting the compression degree of the sealing ring structure, so that the lithium battery cover plate structure is ensured to have good sealing property and insulation property after being assembled.

Description

Lithium battery top cover structure

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a top cover structure of a lithium battery.

Background

Along with the development of electric automobiles, the demand for lithium batteries is gradually increased, and the lithium batteries are batteries using a nonaqueous electrolyte solution by taking lithium metal or lithium alloy as a negative electrode material. The lithium battery mainly comprises a shell, an electric core and a top cover, wherein the top cover comprises a top cover plate, a lower plastic block, an injection molding piece, a pole column, a sealing ring, an explosion-proof valve and the like, the sealing ring is sleeved on the pole column, when the pole column and the injection molding piece are fixedly assembled by riveting and compacting the pole column and the injection molding piece, the sealing ring is tightly compacted, and is packaged between the cover plate and the pole column, so that the lithium battery cover plate structure achieves the effects of insulation and sealing.

Disclosure of Invention

The utility model aims to solve the defects of the technology, and provides a lithium battery top cover structure which is simple to assemble, and the compression degree of a sealing ring structure is limited, so that the sealing ring is prevented from being excessively extruded to cause mechanical damage, and the lithium battery cover plate structure is ensured to have good sealing property and insulation property after being assembled.

In order to solve the technical problems, the technical scheme of the utility model is as follows: the utility model provides a lithium cell top cap structure, includes apron piece, lower plastic slab, utmost point post, sealing washer structure, the apron piece link up there is the mounting hole, the plastic slab link up down have with the coaxial sealing hole that sets up of mounting hole, the top of utmost point post is passed the sealing hole is inserted in the mounting hole, the bottom of utmost point post is provided with the mounting panel, the external diameter of utmost point post is less than the internal diameter of mounting hole, the mounting hole the sealing hole the utmost point post the mounting panel forms the cooperation cavity, sealing washer structure includes first sealing washer and second sealing washer, first sealing washer with the equal cover of second sealing washer is located on the utmost point post, first sealing washer is located the cooperation cavity, the second sealing washer is located the top department of first sealing washer, the downthehole joint of mounting has the pressfitting piece, the pressfitting piece link up and supplies the card hole of utmost point post joint, the pore wall is provided with two at least blocks in the top of card, the bottom of block with the top surface of utmost point post is inconsistent with the bottom of the second sealing washer is provided with the extrusion ring, the outer wall of the second sealing washer is provided with the extrusion ring.

Preferably, the pressing piece comprises a pressing block and an injection molding block, the clamping hole is formed in the pressing block, the extruding ring is formed in the bottom of the injection molding block, a clamping ring is arranged on the inner hole wall of the clamping hole, and the pole is inserted into the end part of the clamping hole to form an annular clamping groove.

Preferably, the hole wall of mounting hole has been seted up and has been supplied the hole of placing that the second sealing washer placed, the hole wall of placing the hole orientation the utmost point post slope sets up, the internal diameter of placing the hole is followed and is close to one side of mounting hole reduces gradually, the inclined plane that the orientation placed the hole slope and set up is seted up to the outer wall of extrusion ring, the inclined plane with the hole wall of placing the hole all with the second sealing washer offsets tightly.

Preferably, the top of the injection molding block is provided with a mounting groove, and the bottom of the pressing block is provided with a mounting block inserted into the mounting groove.

Preferably, positioning columns are uniformly arranged around the bottom surface of the injection molding block, and positioning holes for inserting the positioning columns are formed in the positions, corresponding to the mounting holes, of the top surface of the cover plate piece.

Preferably, a positioning part is arranged at the bottom of the lower plastic plate corresponding to the periphery of the sealing hole, and opposite side walls of each positioning part are in contact with the outer wall of the mounting plate.

The beneficial effects of the utility model are as follows: the utility model discloses the assembly is simple, the terminal post passes the cover plate piece and inserts the card downthehole of pressfitting piece with the tip of plastic board down, until the top surface of terminal post is inconsistent with the bottom surface that prevents the piece, prevent the terminal post to continue to insert, so as to accomplish the joint of terminal post and pressfitting spare, at this moment, cover plate piece and plastic board down form a firm whole through the joint of terminal post and pressfitting spare, first sealing washer compresses tightly the deformation in the cooperation cavity, with shutoff terminal post, the sealing hole, the space between the mounting hole bottom, pressfitting spare and first sealing washer are separated to the second sealing washer, in assembly process, the extrusion ring extrudees first sealing washer and makes it compress tightly the deformation, with the space between shutoff terminal post and the mounting hole top, first sealing washer can cushion the pressure that pressfitting spare inserted the mounting hole, cooperate the block, supplementary degree of compressing tightly of prescribing a limit sealing washer structure, can avoid first sealing washer by the extrusion excessively and take place mechanical damage to a certain extent, in order to ensure that this lithium cell cover plate structure possesses better leakproofness and insulativity after assembling.

Drawings

FIG. 1 is a schematic structural view of an embodiment;

FIG. 2 is an exploded view of an embodiment;

FIG. 3 is an exploded view of a second embodiment;

fig. 4 is a cross-sectional view of an embodiment.

In the figure: 1. a cover sheet; 2. a lower plastic plate; 3. a pole; 4. a seal ring structure; 41. a first seal ring; 42. a second seal ring; 5. a mounting hole; 6. sealing the hole; 7. pressing the piece; 71. briquetting; 72. injection molding the block; 8. a clamping hole; 9. a block; 10. a pressing ring; 11. a clasp; 12. a clamping groove; 13. placing the hole; 14. an inclined plane; 15. a mounting groove; 16. a mounting block; 17. positioning columns; 18. positioning holes; 19. a positioning part; 20. and (3) mounting a plate.

Detailed Description

The utility model is further described below by way of examples with reference to the accompanying drawings.

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, a top cover structure of a lithium battery comprises a cover plate piece 1, a lower plastic plate 2, a pole column 3 and a sealing ring structure 4, wherein the number of the lower plastic plate 2 is two, the two lower plastic plates 2 are arranged at two sides of the bottom of the cover plate disc, the number of the pole column 3 is two, the two pole columns 3 are respectively a positive electrode connecting end and a negative electrode connecting end, the number of the sealing ring structure 4 is two, the two sealing ring structures 4 are respectively assembled with the two pole columns 3, the sealing ring structure 4 comprises a first sealing ring 41 and a second sealing ring 42, the first sealing ring 41 and the second sealing ring 42 are sleeved on the pole column 3, and the second sealing ring 42 is positioned above the first sealing ring 41.

The cover plate piece 1 is communicated with two mounting holes 5, the lower plastic plate 2 is communicated with a sealing hole 6 coaxially arranged with the mounting holes 5, when the lithium battery top cover is assembled, the lower plastic plate 2 can be attached to the bottom surface of the cover plate piece 1, the sealing hole 6 is aligned with the mounting holes 5, the mounting plate 20 is arranged at the bottom of the pole column 3, the positioning parts 19 are arranged at the periphery of the sealing hole 6 corresponding to the bottom of the lower plastic plate 2, and the opposite side walls of the positioning parts 19 are all abutted to the outer wall of the mounting plate 20 so as to position the inserting position of the pole column 3 on the lower plastic plate 2.

The first sealing ring 41 is sleeved on the pole 3, the bottom surface of the first sealing ring 41 is abutted against the top surface of the mounting plate 20, the top of the pole 3 passes through the sealing hole 6 and is inserted into the mounting hole 5, the outer diameter of the pole 3 is smaller than the inner diameter of the mounting hole 5, the sealing hole 6, the pole 3 and the mounting plate 20 form a matching cavity, and the first sealing ring 41 is positioned in the matching cavity.

The mounting hole 5 is internally inserted with a pressing piece 7, the pressing piece 7 comprises a pressing block 71 and an injection molding block 72, the top of the injection molding block 72 is provided with a mounting groove 15, and the bottom of the pressing block 71 is provided with a mounting block 16 inserted into the mounting groove 15 so as to guide the mounting between the pressing block 71 and the injection molding block 72. The positioning columns 17 are uniformly arranged around the bottom surface of the injection molding block 72, the positioning holes 18 for the positioning columns 17 to be inserted are formed in the positions, corresponding to the mounting holes 5, of the top surface of the cover plate sheet 1, so that the mounting positions of the pressing pieces 7 on the top cover sheet are guided, the pressing pieces 7 are ensured to correspond to the tops of the pole columns 3, the pressing pieces 7 and the pole columns 3 are conveniently and fixedly clamped, and the cover plate sheet 1 and the lower plastic plate 2 form a stable whole through the clamping of the pole columns 3 and the pressing pieces 7.

The briquetting 71 link up and supplies the clamping hole 8 of terminal 3 joint, the bottom of moulding plastics piece 72 is formed with the confession in the extrusion ring 10 that terminal 3 passed through in the clamping hole 8 of clamping block is inserted to terminal 3 pass cover sheet 1 and lower plastic board 2, the hole wall of clamping hole 8 is provided with snap ring 11, terminal 3 inserts annular draw-in groove 12 has been seted up to terminal in the clamping hole 8, the top inner wall of clamping hole 8 is provided with four blocking pieces 9 of symmetrical arrangement, through exerting pressure to briquetting 71 and mounting panel 20 for terminal 3 continues to insert in the clamping hole 8, until the bottom surface of blocking piece 9 with the top surface of terminal 3 is inconsistent in the draw-in groove 12, and each blocking piece 9 is used for preventing terminal 3 to continue to insert in clamping hole 8, and in this process, first sealing washer 41 is in the tight deformation of cooperation cavity pressure to the clearance between terminal 3, sealing hole 6, mounting hole 5 bottom, and second 42 separate extrusion ring 10 and first sealing washer 10, the tight sealing washer 4 is pressed with the sealing washer 4 of a certain degree of elasticity, and the sealing washer 4 is prevented from being out of the tight seal structure of the limit that the sealing washer is pressed down with the second sealing washer 41, and the sealing washer is pressed down the sealing washer 4 is pressed to the degree of the limit degree of the installation structure is used for the sealing washer 41.

The hole wall of mounting hole 5 has offered the confession the hole 13 of placing of second sealing washer 42, the hole wall of placing hole 13 orientation utmost point post 3 slope setting, the internal diameter of placing hole 13 is followed and is close to one side of mounting hole 5 reduces gradually, the inclined plane 14 that the orientation placed hole 13 slope setting was offered to the outer wall of extrusion ring 10, inclined plane 14 with the hole wall of placing hole 13 all offsets tightly with second sealing washer 42, and the part of guide second sealing washer 42 compaction deformation is packed into the cavity department between the top hole wall of mounting hole 5 and utmost point post 3, further strengthens the leakproofness of second sealing washer 42.

Of course, the above is only a typical example of the utility model, and other embodiments of the utility model are also possible, and all technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of the utility model claimed.

Claims

1. A lithium battery top cover structure is characterized in that: including apron piece (1), lower plastic board (2), utmost point post (3), sealing washer structure (4), apron piece (1) link up there is mounting hole (5), lower plastic board (2) link up have with sealing hole (6) of coaxial setting of mounting hole (5), the top of utmost point post (3) is passed sealing hole (6) and inserts in mounting hole (5), the bottom of utmost point post (3) is provided with mounting panel (20), the external diameter of utmost point post (3) is less than the internal diameter of mounting hole (5), mounting hole (5) sealing hole (6) utmost point post (3) mounting panel (20) form the cooperation cavity, sealing washer structure (4) include first sealing washer (41) and second sealing washer (42) all overlap to be located on utmost point post (3), first sealing washer (41) are located the cooperation cavity, second sealing washer (42) are located first clamping piece (7) top clamping piece (7) have at least, sealing washer (7) top (7) have the laminating piece (8), the bottom surface of the preventing block (9) is in contact with the top surface of the pole (3), the bottom of the pressing piece (7) is provided with a pressing ring (10) for inserting the pole (3), and the outer wall of the pressing ring (10) is abutted against the inner wall of the second sealing ring (42).

2. The lithium battery top cover structure according to claim 1, wherein: pressfitting spare (7) include briquetting (71) and injection molding piece (72), draw-in hole (8) set up in briquetting (71), extrusion ring (10) form in the bottom of injection molding piece (72), the hole wall of draw-in hole (8) is provided with snap ring (11), pole (3) are inserted annular draw-in groove (12) have been seted up to tip in draw-in hole (8).

3. The lithium battery top cover structure according to claim 2, characterized in that: the hole wall of mounting hole (5) has offered supplies place hole (13) that second sealing washer (42) placed, place hole (13)'s hole wall orientation utmost point post (3) slope setting, place hole (13)'s internal diameter along being close to one side of mounting hole (5) reduces gradually, the inclined plane (14) towards place hole (13) slope setting are offered to the outer wall of extrusion ring (10), inclined plane (14) with place hole (13)'s hole wall all with second sealing washer (42) offset tightly.

4. The lithium battery top cover structure according to claim 2, characterized in that: the top of the injection molding block (72) is provided with a mounting groove (15), and the bottom of the pressing block (71) is provided with a mounting block (16) inserted into the mounting groove (15).

5. The lithium battery top cover structure according to claim 2, characterized in that: positioning columns (17) are uniformly arranged around the bottom surface of the injection molding block (72), and positioning holes (18) for inserting the positioning columns (17) are formed in the positions, corresponding to the mounting holes (5), of the top surface of the cover plate sheet (1).

6. The lithium battery top cover structure according to claim 1, wherein: the bottom of the lower plastic plate (2) is provided with positioning parts (19) corresponding to the periphery of the sealing hole (6), and the opposite side walls of each positioning part (19) are in contact with the outer wall of the mounting plate (20).