CN218731350U - Top cover assembly and battery cell - Google Patents

Abstract

The utility model provides a top cover component and an electric core, which comprises a top cover, a first end surface and a second end surface which are oppositely arranged, and a first through hole which runs through the first end surface and the second end surface; the pole assembly penetrates through the first through hole and extends out in the direction far away from the first end face and the second end face; the first insulating assembly is arranged on the second end face of the top cover and surrounds the surface of the pole assembly; at least one pair of pressing blocks are arranged on one side end face of the first insulating assembly and arranged around the side surface of the part extending out of the second end face; the second insulating assembly is arranged around the side surface of the pole assembly extending into the first through hole; and is hermetically connected with the first insulating component, the first through hole, the top cover or at least one pair of pressing blocks; and the surface of the part of the pole assembly extending out of the second end surface is also provided with a positioning groove, each pressing block also extends into and is abutted against the positioning groove, and a welding seam area is formed between the adjacent end surfaces of the pressing blocks and the end part of the pressing block and the end part of the pole assembly extending out of the second end surface.

Description

Top cover assembly and battery cell

Technical Field

The utility model relates to a new energy battery technical field especially relates to a top cap subassembly and electricity core.

Background

Be provided with utmost point post on square lithium ion battery's the top cap subassembly, the utmost point post mainly adopts following two kinds of modes with the top cap subassembly is assembled at present: the riveting type and the integral injection molding type are adopted, wherein the riveting type assembly is that the terminal post is assembled with the top cover assembly through a riveting block, then the riveting block and the terminal post are subjected to press riveting, and then the riveting block and the terminal post are fixed in a laser welding mode; the whole injection molding type assembly is that the whole injection molding is carried out between the outer side of the pole and the pole mounting through hole of the top cover assembly to form an annular insulation structure of the sealed pole, and the pole is fixed by listening to a whole injection molding mode. The riveting assembly mode needs riveting and welding, the process is complex, and the riveting block bears great riveting force during riveting, so that the local deformation of the riveting block can be caused, the flatness of the end face of the riveted riveting block is poor, and adverse effects are generated on the subsequent manufacturing of the battery module; the working of plastics of whole injection moulding formula assembly can bear impact or vibration for a long time in use, and plastics also can be ageing over time moreover, produces adverse effect to the rigidity of the overall structure of top cap subassembly with utmost point post, compares that metal structure's intensity and stability are all relatively poor.

The utility model discloses a utility model CN 216958423U's utility model discloses a core module welding switching utmost point post structure, it sets up the electrically conductive piece of second on first electrically conductive piece, and the first electrically conductive top of piece department sets up the spacing post of the electrically conductive piece laminating of second, welds around the first electrically conductive profile of electrically conductive piece and the electrically conductive piece of second, and the boss and the connecting piece place region of utmost point post are kept away from in the welding region. The second conductive piece of the scheme needs to be riveted on the first conductive piece in advance, the welding seam is long, and the welding workload is large. Based on the defects of the prior art, a top cover assembly and a battery cell which do not need a riveting process, have small welding workload and can reliably fasten a pole column are needed to be provided.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a need not riveting in advance, can carry out reliable top cap subassembly and electric core that fastens to the utmost point post.

The technical scheme of the utility model is realized like this: in one aspect, the utility model provides a top cap assembly, include

The top cover comprises a top cover body and a bottom cover body, wherein the top cover body is provided with a first end surface and a second end surface which are oppositely arranged, and a first through hole which penetrates through the first end surface and the second end surface;

the pole column penetrates through the first through hole and extends out of the first end face and the second end face;

the first insulating assembly is arranged on the second end face of the top cover body, surrounds the pole and extends out of the surface of the second end face;

the pair of pressing blocks is arranged on the end face, far away from the top cover body, of one side of the first insulating assembly; at least one pair of pressing blocks extends outwards in the direction far away from the second end face and is arranged around the side surface of the part of the pole extending out of the second end face;

the second insulating assembly is arranged around the side surface of the pole extending into the first through hole;

the surface of the part of the pole extending out of the second end face is further provided with a positioning groove, the at least one pair of pressing blocks further extend into the positioning groove and are abutted against the inner surface of the positioning groove, and a welding seam area is formed between the end faces adjacent to the at least one pair of pressing blocks and the end part of the pole extending out of the second end face.

On the basis of the above technical scheme, preferably, the second end face of the top cover body is provided with a first caulking groove, the first caulking groove is matched with the thickness of the first insulating component, and the first insulating component is embedded in the first caulking groove.

Preferably, the edge of the first caulking groove along the length extending direction of the top cover body is also provided with a first protruding part, the edge of one side of the first insulating component close to the first end face is correspondingly provided with a second caulking groove, and the shape of the second caulking groove is matched with the outline of the first protruding part.

Preferably, the edge of one side of the first insulating assembly, which is far away from the second end face, is provided with a second protruding part, and the second protruding part protrudes outwards in the direction far away from the second end face; and the end parts of the at least one pair of pressing blocks, which are close to the second end surface, are provided with third caulking grooves, and the shapes of the third caulking grooves are matched with the second convex parts at the edge of the first insulation assembly.

Preferably, the end faces, close to the first through hole, of the at least one pair of pressing blocks are provided with annular convex parts, and the annular convex parts are embedded in the positioning grooves and abut against the inner surfaces of the positioning grooves.

Preferably, the extension length of the at least one pair of pressing blocks along the axial direction of the first through hole exceeds the length of the pole exceeding the second end face; and a profiling groove is also arranged between at least one pair of adjacent pressing blocks or on the edge of the end part of each pressing block close to the pole exceeding the second end face, and the inner surface of the profiling groove is flush with the end part of the pole exceeding the second end face.

Preferably, the top cover further comprises a third insulating assembly, the third insulating assembly is arranged on the first end face of the top cover body, a fourth caulking groove is formed in one side, away from the first end face, of the third insulating assembly, a second through hole is formed in one side, close to the first end face, of the third insulating assembly, and the second through hole is communicated with the first through hole and the fourth caulking groove respectively; the end part of the pole extending out of the first end surface penetrates through the second through hole and is embedded in the fourth embedding groove; the second insulation assembly further penetrates through the first through hole and is embedded in the second through hole, and the second insulation assembly is abutted to the first end face of the ejector rod and the surfaces of the at least one pair of pressing blocks extending into the first through hole and the second through hole respectively.

Preferably, the anti-explosion valve is further included, a third through hole is formed in the top cover body, and the anti-explosion valve is embedded in the third through hole and is fixedly connected with the top cover body; and the third insulating component is provided with a plurality of first windows which are arranged opposite to the third through holes.

Preferably, the liquid injection device further comprises a liquid injection hole, the liquid injection hole is arranged on the top cover body in a penetrating manner, and the liquid injection hole and the top cover body are arranged in a sealing manner; and the third insulating component is provided with a plurality of second windows which are arranged opposite to the liquid injection hole.

On the other hand, the utility model also provides an electricity core, be used for placing the book core in the square shell, a side end face of square shell is provided with the opening, and the opening position of square shell is provided with foretell top cap subassembly, utmost point post and book core electric connection.

The utility model provides a pair of top cap subassembly and electric core for prior art, has following beneficial effect:

(1) The posture stability of the pole component with different end part areas relative to the top cover is better, and the pole component has larger contact area with the top cover, so that the pole component is placed more stably; the press blocks can be tightly attached to the pole post assembly by arranging the plurality of press blocks and the positioning grooves matched with the pole post assembly, so that the subsequent welding is facilitated, and the press blocks and the pole post assembly form a complete conductive whole;

(2) The profiling groove is formed in the end portion of the pressing block, a welding area is avoided, a welding seam is contained, riveting or injection molding process treatment is not conducted, the end face, not provided with the profiling groove, of the end portion of the pressing block has good flatness, and the requirement for machining shape and position sizes is met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a perspective view of a top cover assembly of the present invention;

fig. 2 is an exploded perspective view of a top cap assembly of the present invention;

FIG. 3 is an enlarged top view and sectional view taken along line A-A of the top cap assembly of the present invention;

fig. 4 is a perspective view of a top cover assembly of the present invention;

fig. 5 is a partially enlarged schematic view of a half-section front view of a top cover assembly according to the present invention;

fig. 6 is a perspective view of a first insulating assembly of a header assembly of the present invention;

fig. 7 is a top view and a B-B sectional view of a first insulating assembly of a header assembly according to the present invention;

fig. 8 is a perspective view of a pole assembly of a top cap assembly according to the present invention;

fig. 9 is a top view and a C-C sectional view of a post assembly of a cap assembly according to the present invention;

fig. 10 is a perspective view of an attitude of a pressing block of a head cover assembly of the present invention;

FIG. 11 is a top view and a cross-sectional view taken along line D-D of FIG. 10;

fig. 12 is a perspective view of a second insulating assembly of a header assembly in accordance with the present invention;

fig. 13 is a perspective view of a third insulating assembly of a header assembly of the present invention;

fig. 14 is a perspective view of the top cap assembly applied to an electrical core of the present invention.

Reference numerals: 1. a top cover; 100. a first through hole; 11. a first end face; 12. a second end face; 2. a pole assembly; 3. a first insulating assembly; 4. briquetting; 5. a second insulating assembly; 20. positioning a groove; 21. a plate-like body; 22. a columnar body; 13. a first caulking groove; 14. a first boss portion; 31. a second caulking groove; 32. a second boss portion; 40. a third caulking groove; 41. an annular boss; 42. a profiling groove; 6. a third insulating assembly; 61. a fourth caulking groove; 200. a second through hole; 300. a third through hole; 7. an explosion-proof valve; 300. a third through hole; 62. a first window; 8. a liquid injection hole; 63. a second window; 400. and a fourth via.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in fig. 1-3, the utility model provides a need not in advance riveting, can fasten top cap subassembly and electric core to utmost point post and top cap subassembly.

The technical scheme of the utility model is realized like this: on the one hand, the utility model provides a top cap subassembly, including top cap body 1, utmost point post 2, first insulation subassembly 3, at least a pair of briquetting 4 and second insulation subassembly 5.

The top cover body 1 is provided with a first end surface 11 and a second end surface 12 which are oppositely arranged at intervals, and a first through hole 100 which penetrates through the first end surface 11 and the second end surface 12; the first end face 11 is the end face of the top cover far away from the roll core, and the second end face 12 is the end face of the top cover close to the roll core. The first through hole 100 serves to define the relative position of the pole assembly.

The pole 2 is arranged in the first through hole 100 in a penetrating manner and extends out of the first end surface 11 and the second end surface; the illustrated pole 2 includes a plate-like body 21 and a column-like body 22; the plate-like body 21 is located at the first end surface 11 side, and the column-like body 22 penetrates the first through hole 100 and extends outward.

The first insulating component 3 is arranged on the second end face 12 of the top cover body 1 and surrounds the surface of the pole 2 extending out of the second end face 12; the first insulating assembly 3 serves to insulate a part of the surface of the pole 2 in the radial direction from the cap body 1.

At least one pair of pressing blocks 4 are arranged on one side end face of the first insulating component 3 far away from the second end face 12, the at least one pair of pressing blocks 4 further extend outwards in the direction far away from the second end face 12, and are arranged around the part of the side surface of the pole 2 extending out of the second end face 12; the pressing block 4 is respectively abutted against the surfaces of the first insulating component 3 and the pole 2.

The second insulating component 5 is arranged around the side surface of the pole 2 extending into the first through hole 100 and is hermetically connected with the first insulating component 3, the first through hole 100, the top cover body 1 or at least one pair of pressing blocks 4; the second insulating assembly 5 extends into the first through hole 100, and fills a gap between the cylindrical body 22 and the first through hole 100 of the top cover 3, so that a sealing function is realized, and electrolyte of a subsequently assembled battery cell is prevented from leaking.

And a positioning groove 20 is further formed in the side surface of the part, extending out of the second end surface 12, of the pole 2, at least one pair of pressing blocks 4 further extend into the positioning groove 20 and abut against the inner surface of the positioning groove 20, and a welding seam area is formed between the end surfaces, adjacent to the at least one pair of pressing blocks 4, of the at least one pair of pressing blocks 4 and the end part, extending out of the second end surface 12, of the pole 2.

The positioning groove 20 is an annular groove, the cross section of the positioning groove 20 can be a rectangular, triangular, trapezoidal or polygonal structure, and the shape of the corresponding pressing block 4 extending into the positioning groove 20 is matched with the cross section of the positioning groove 20. The press blocks 4 of the scheme are at least arranged in a pair, the splicing positions of the two press blocks 4 and the adjacent positions of the press blocks 4 and the end faces of the columnar bodies 22 are welding areas, namely cross line areas shown in a partial enlarged view of an upper drawing of a drawing in figure 3, the areas of non-welding areas are large, the flatness is good, and the length of welding seams is much smaller than that of the prior art scheme. Because rivets and riveting processes are not used, and the pressing block 4 and the cylindrical body 22 of the pole 2 are welded to form an integral pole structure with a conductive function, the integral pole structure with the conductive function has a larger contact area. And the plate-shaped body 21 and the column-shaped body 22 are combined with the pressing block 4, so that the integral strength is high, and the problem of strength reduction caused by long-term use of injection molding parts can be solved. The number of briquettes 4 in this embodiment is preferably one pair. The two pressing pieces 4 extend in the horizontal longitudinal direction of the header body 1 in the drawing, but may extend in the horizontal width direction of the header body 1. The pressing block 4, the pole 2 and the top cover body 1 are all made of metal materials with good electric conductivity.

As shown in fig. 3-7, the second end face 12 of the top cover body 1 is provided with a first caulking groove 13, the first caulking groove 13 is matched with the thickness of the first insulating component 3, and the first insulating component 3 is embedded in the first caulking groove 13. The first caulking groove 13 is used for prepositioning the first insulating member 3 and enables the end face of the first insulating member 3 to be flush with the second end face 12 of the cap body 1. The first insulating block 3 is provided with a through fourth through hole 400 for allowing the cylindrical body 22 to pass through smoothly. The fourth through-hole 400 is sized to accommodate the diameter of the cylindrical body 22. The edge of the first insulating assembly 3 of the fourth through hole 400 may further be provided with a neck portion protruding along the axial direction of the first through hole 100 to increase the attaching area with the surface of the pillar 22, so that the first insulating assembly 3 is placed more stably. Is favorable for the more stable placement and sliding of the follow-up pressing block.

In a preferred embodiment, in order to prevent the first insulating assembly 3 from laterally shaking, a first protrusion 14 is further disposed at an edge of the first caulking groove 13 along a length extension direction of the top cover body 1, a second caulking groove 31 is correspondingly disposed at an edge of the first insulating assembly 3 on a side close to the first end surface 11, and a shape of the second caulking groove 31 matches with a contour of the first protrusion 14. The first protruding portion 14 is matched with the second caulking groove 31 at the edge of the first insulating component 3 in shape, so that the position accuracy of the first insulating component 3 in the first caulking groove 13 can be improved.

Similarly, in order to define the direction of the pressure block 4 on the first insulating component 3 and perform the pre-positioning function, the edge of the side of the first insulating component 3 away from the second end face 12 is further provided with a second protruding part 32, and the second protruding part 32 protrudes outwards in the direction away from the second end face 12; the end part of the pressing block 4 close to the second end face 12 is correspondingly provided with a third caulking groove 40, and the shape of the third caulking groove 40 is matched with the second bulge part 32 at the edge of the first insulating component 3. Preferably, the size of the third caulking groove 40 in the radial direction or the size of the third caulking groove in the axial direction of the first through hole may be not smaller than the contour of the second protrusion 32, so that the pre-positioning capability is achieved, the pressing block 4 is not easily reversed when placed on the first insulating member 3, and the second protrusion 32 limits the range of sliding of the pressing block 4 along the surface of the first insulating member 3.

As shown in fig. 8-11, in order to better fit the positioning groove 20 on the cylindrical body 22, an annular protrusion 41 is disposed on the end surface of the pressing block 4 close to the first through hole 100, and the annular protrusion 41 is embedded in the positioning groove 20 and abuts against the inner surface of the positioning groove 20. One end of the positioning groove 20 in the opening direction is flush with the second end face 12, the other end of the positioning groove 20 in the opening direction extends outwards towards the axial direction of the column-shaped body 22, one end face of the annular convex part 41 on the pressing block 4 is also flush with the second end face 12, and the height of the annular convex part 41 extending along the axial direction of the column-shaped body 22 does not exceed the height of the positioning groove 20, so that the annular convex part can be smoothly inserted into the positioning groove 20.

As shown in fig. 3, the extension length of the compact 4 along the axial direction of the first through hole 100 exceeds the length of the pole 2 beyond the second end face 12; a profiling groove 42 is further formed between at least one pair of adjacent pressing blocks 4 or on the edge of the end part, close to the pole 2, of each pressing block 4, exceeding the second end face 12, and the inner surface of the profiling groove 42 is flush with the end part, exceeding the second end face 12, of the pole 2. The profiling groove 42 shown in the figure is a welding area of the end faces of the adjacent pressing block 4 and the cylindrical body 22, and because the welded welding seam can be protruded outwards, in order to ensure that the flatness of the whole pressing block 4 and the pole 2 is not affected, the height of the edge area of the current pressing block 4, which is not close to the edge of the adjacent pressing block or the edge area of the end face of the column body 22, is higher than that of the profiling groove 42, so that after the whole structure is formed by welding the cylindrical body 22 and the pressing block 4 or the adjacent pressing block 4, the flatness of the whole structure cannot be affected by the welding seam.

As shown in fig. 2, 3, 8, 9, 12 and 13, in order to define the position of the plate-shaped body 21 of the pole 2, the utility model further comprises a third insulating assembly 6, the third insulating assembly 6 is disposed on the first end surface 11 of the top cover body 1, a fourth caulking groove 61 is disposed on one side of the third insulating assembly 6 away from the first end surface 11, a second through hole 200 is disposed on one side of the third insulating assembly 6 close to the first end surface 11, and the second through hole 200 is respectively communicated with the first through hole 100 and the fourth caulking groove 61; the end part of the pole 2 extending out of the first end surface 11 passes through the second through hole 200 and is embedded in the fourth embedding groove 61; the second insulation component 5 also penetrates through the first through hole 100 and is embedded in the second through hole 200, and the second insulation component 5 is respectively propped against the first end surface 11 of the ejector rod and the surfaces of at least one pair of pressing blocks 4 extending into the first through hole 100 and the second through hole 200. The fourth caulking groove 61 is in a rectangular structure, the corresponding plate-shaped body 21 is also in a rectangular structure, three vertexes of the fourth caulking groove 61 are rounded corners, the other vertex is a chamfer, the structure of the plate-shaped body 21 is the same, and the plate-shaped body 21 can be prevented from shaking in the fourth caulking groove 61. The other side of the third insulating member 6 is provided with a second through-hole 200 communicating with the first through-hole 100. The second insulating assembly 5 of this scheme has a minor diameter end and a major diameter end, and the minor diameter end inserts in first through-hole 100 and with top cap body 1, first insulating assembly 3 or columnar body 22 sealing connection, and second through-hole 200 is then used for holding the major diameter end of second insulating assembly 5.

After the equipment is electric core, in time the pressure release for making the gas that produces unusually in the electric core, the utility model discloses explosion-proof valve 7 has still been set up. The top cover body 1 is provided with a third through hole 300, and the explosion-proof valve 7 is embedded in the third through hole 300 and is fixedly connected with the top cover body 1; the third insulating assembly 6 is provided with a plurality of first windows 62 opposite to the third through holes 300. The gas inside the battery cell can pass through the third through hole 300 to reach the explosion-proof valve 7, the explosion-proof valve 7 is welded with the top cover body 1, and the surface of the explosion-proof valve 7 is provided with an intensity weakening structure, such as nicks, so that the intensity weakening structure can be opened when the internal pressure of the battery cell is large, and the internal pressure of the battery cell can be released conveniently.

As a preferable embodiment, the utility model also comprises a liquid injection hole 8, the liquid injection hole 8 is arranged on the top cover body 1 in a penetrating way, and the liquid injection hole 8 is arranged in a sealing way with the top cover body 1; the third insulating component 6 is provided with a plurality of second windows 63 which are arranged opposite to the liquid injection hole 8. After top cap and top cap subassembly equipment are electric core, need annotate electrolyte in the seal structure of electric core, annotate liquid hole 8 this moment and be open, electrolyte gets into through second window 63 and rolls up core department, annotates the liquid and accomplish the back, should annotate liquid hole 8 sealed can.

In addition, as shown in fig. 14, the utility model also provides an electric core, be used for placing the book core in the square shell, a side end face of square shell is provided with the opening, and the opening position of square shell is provided with foretell top cap subassembly, utmost point post 2 and book core electric connection.

The using method of the utility model is that the first insulating component 3, the third insulating component 6 and the second insulating component 5 are connected with the top cover body 1 in a sealing way in advance, and then the plate-shaped body 21 is embedded in the fourth embedding groove 61, so that the column-shaped body 22 sequentially passes through the second through hole 200, the first through hole 100 and the fourth through hole 400 and extends out of the second end face 12; then, pressing blocks 4 arranged in pairs are placed on the first insulating assembly 3, and the pressing blocks 4 are slid, so that the annular convex parts 41 of the pressing blocks 4 are completely embedded in the positioning grooves 20 of the cylindrical bodies 22; and finally, welding the edges of the adjacent pressing blocks 4 or the adjacent positions of the pressing blocks 4 and the columnar bodies 22 in the area of the profiling groove 42, cleaning welding seams and welding slag to ensure that the welding seams do not exceed the height of the profiling groove 42 to obtain a top cover assembly, assembling the top cover assembly, the square shell and the winding core into a battery core, and filling electrode liquid into the battery core to obtain a finished product battery core.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A header assembly, comprising:

the roof comprises a roof body (1), wherein the roof body (1) is provided with a first end surface (11) and a second end surface (12) which are oppositely arranged, and a first through hole (100) which penetrates through the first end surface (11) and the second end surface (12);

the pole column (2) penetrates through the first through hole (100) and extends out of the first end face (11) and the second end face (12);

the first insulating component (3) is arranged on the second end face (12) of the top cover body (1), surrounds the pole (2) and extends out of the surface of the second end face (12);

at least one pair of pressing blocks (4) are arranged on the end face of one side, far away from the top cover body (1), of the first insulating component (3); at least one pair of pressing blocks (4) outwards extend towards the direction far away from the second end face (12) and are arranged around the side surface of the part of the pole (2) extending out of the second end face (12);

the second insulating assembly (5) surrounds the side surface of the pole (2) extending into the first through hole (100);

wherein, utmost point post (2) stretch out the surface of the part of second terminal surface (12) still is provided with constant head tank (20), at least a pair of briquetting (4) still stretch into in constant head tank (20) and with the internal surface looks butt of constant head tank (20), at least a pair of briquetting (4) adjacent terminal surface and at least a pair of briquetting (4) and utmost point post (2) stretch out and form the welding seam region between the tip of second terminal surface (12).

2. The top cover assembly according to claim 1, wherein the second end face (12) of the top cover body (1) is provided with a first caulking groove (13), the first caulking groove (13) is matched with the thickness of the first insulating assembly (3), and the first insulating assembly (3) is embedded in the first caulking groove (13).

3. A roof assembly according to claim 2, characterized in that the first caulking groove (13) is further provided with a first protruding portion (14) along the edge of the roof body (1) in the length extending direction, the edge of the first insulating assembly (3) close to the first end surface (11) is correspondingly provided with a second caulking groove (31), and the shape of the second caulking groove (31) is matched with the contour of the first protruding portion (14).

4. A roof assembly according to claim 3, characterised in that the edge of the side of the first insulating assembly (3) remote from the second end face (12) is provided with a second projection (32), the second projection (32) projecting outwardly away from the second end face (12); and the end parts of the at least one pair of pressing blocks (4) close to the second end face (12) are provided with third caulking grooves (40), and the shapes of the third caulking grooves (40) are matched with the second protruding parts (32) at the edge of the first insulating component (3).

5. The cap assembly according to claim 4, wherein the pair of pressing pieces (4) are provided with annular protrusions (41) on end surfaces thereof close to the first through hole (100), and the annular protrusions (41) are embedded in the positioning grooves (20) and abut against inner surfaces of the positioning grooves (20).

6. The top cover assembly according to claim 4, wherein the at least one pair of compacts (4) extends along the axial direction of the first through hole (100) for a length exceeding the length of the pole (2) beyond the second end face (12); a profiling groove (42) is further formed between at least one pair of adjacent pressing blocks (4) or at the edge of the end part, close to the pole (2), of each pressing block (4) and exceeding the second end face (12), and the inner surface of each profiling groove (42) is flush with the end part, exceeding the second end face (12), of each pole (2).

7. The top cover assembly according to claim 4, further comprising a third insulating assembly (6), wherein the third insulating assembly (6) is arranged on the first end surface (11) of the top cover body (1), a fourth caulking groove (61) is arranged on one side of the third insulating assembly (6) far away from the first end surface (11), a second through hole (200) is arranged on one side of the third insulating assembly (6) close to the first end surface (11), and the second through hole (200) is respectively communicated with the first through hole (100) and the fourth caulking groove (61); the end part of the pole (2) extending out of the first end face (11) penetrates through the second through hole (200) and is embedded in the fourth embedding groove (61); the second insulation component (5) further penetrates through the first through hole (100) and is embedded in the second through hole (200), and the second insulation component (5) is abutted to the surfaces of the first end face (11) of the ejector rod and the surfaces of the at least one pair of pressing blocks (4) extending into the first through hole (100) and the second through hole (200) respectively.

8. The top cover assembly according to claim 7, further comprising an explosion-proof valve (7), wherein a third through hole (300) is formed in the top cover body (1), and the explosion-proof valve (7) is embedded in the third through hole (300) and is fixedly connected with the top cover body (1); the third insulating component (6) is provided with a plurality of first windows (62) which are arranged opposite to the third through holes (300).

9. A top cover assembly according to claim 7, further comprising a liquid injection hole (8), wherein the liquid injection hole (8) is arranged on the top cover body (1) in a penetrating way, and the liquid injection hole (8) is arranged in a sealing way with the top cover body (1); a plurality of second windows (63) which are opposite to the liquid injection hole (8) are arranged on the third insulating component (6).

10. An electric core, includes hollow square casing and rolls up the core, be used for placing in the square casing and roll up the core, a side end face of square casing is provided with the opening, its characterized in that, the opening position of square casing is provided with the top cap subassembly as claimed in any of claims 1-9, utmost point post (2) and roll up core electric connection.

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