Battery top cover assembly and battery

Abstract

The utility model discloses a battery top cover assembly and a battery. The battery top cover assembly comprises a pole, a top cover body, lower plastic and an insulating film, the top cover body, the lower plastic and the insulating film are stacked, the other end of the post body sequentially penetrates through the third through hole, the second through hole and the first through hole, and the end surface coating area is pressed between the lower plastic and the post boss. The end surface coating area of the insulating film is pressed between the lower plastic and the post boss of the post, so that a hot melting process of the insulating film and the lower plastic can be cancelled, and the production efficiency is improved; the insulating film can be connected to the left side wall or the right side wall of the lower plastic without hot melting, so that the thickness of the lower plastic can be reduced, the overall thickness of the battery top cover assembly can be reduced, and on the contrary, the height of the naked battery cell can be increased to improve the specific energy of the battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field generally, especially a kind of battery top cover assembly and battery. BACKGROUND

[0002] Mylar film is also called Mylar film or insulating film, which has good flexibility and insulation performance, and is widely used in the manufacture of lithium battery cells.

[0003] In the related art, the bare cell usually needs to be wrapped with an insulating film before entering the battery shell, and the cell wrapped with the insulating film is welded with the battery top cover after entering the shell. Among them, the insulating film is connected to the lower plastic, and the thickness of the lower plastic is increased to ensure the connection strength of the two. However, this has certain restrictions on the specific energy and efficiency of the bare cell.

[0004] With the continuous development of lithium battery technology, higher and higher requirements are put forward for the safety performance, specific energy and industrialization efficiency of single battery. Among them, under the condition that the size of the bare cell is certain, the integrated design of the battery top cover assembly becomes an important factor affecting the overall height of the battery, or in other words, under the condition that the overall height of the battery is certain, the integrated design level of the battery top cover assembly becomes an important factor affecting the height of the bare cell. SUMMARY

[0005] The present application aims to provide a battery top cover assembly and a battery, at least for increasing the height of the bare cell to improve the specific energy of the battery.

[0006] The utility model provides a kind of battery top cover assembly, including pole, top cover body, lower plastic, insulating film.

[0007] The pole includes a cylinder;The top cover body is provided with the first through hole for the cylinder to pass through;

[0008] The lower plastic is provided with the second through hole for the cylinder to pass through.

[0009] The insulating film is at least used to wrap the bare cell, and the insulating film includes an end face wrapping area, the end face wrapping area is provided with a third through hole for the cylinder to pass through, the top cover body, the lower plastic and the insulating film are stacked, and the other end of the cylinder passes through the third through hole, the second through hole and the first through hole in sequence. The cylinder passes through the third through hole, the second through hole and the first through hole in sequence.

[0010] The end of the cylinder close to the insulating film extends outward along its circumference to form the pole boss, and the end of the cylinder away from the top cover body is recessed inward along its circumference to form an annular groove.

[0011] At least part of the rivet arranged around the column body is fitted into the annular groove, so that the top cover body, the lower plastic and the insulation film are positioned between the rivet and the pole column boss.

[0012] As an implementation, the end face covering area protrudes towards the lower plastic to form a third groove on the surface of the side of the insulation film away from the lower plastic, and the third groove has a third through hole at the bottom.

[0013] The lower plastic is recessed on the surface towards the end face covering area to form a fourth groove corresponding to the protrusion of the end face covering area, and the fourth groove has a second through hole at the bottom.

[0014] The third groove bottom is pressed between the fourth groove bottom and the pole column boss.

[0015] As an implementation, the surface of the pole column boss in contact with the end face covering area is in the same plane as the surface of the lower plastic towards the end face covering area.

[0016] As an implementation, an upper plastic is further included. The upper plastic is sandwiched between the lower plastic and the rivet.

[0017] As an implementation, the surface of the upper plastic away from the top cover body is recessed to form a second groove, the annular groove is located in the second groove, the rivet is arranged in the second groove, and the rivet is fitted into the annular groove.

[0018] As an implementation, the end face covering area is provided with a third vent hole and a third liquid injection hole.

[0019] As an implementation, the insulation film further includes a first large side covering area and a second large side covering area, the first large side covering area and the second large side covering area are respectively arranged on both sides of the end face covering area, and the first large side covering area is respectively provided with a first small side covering area and a second small side covering area on both sides,

[0020] The second large side covering area is respectively provided with a third small side covering area and a fourth small side covering area on both sides,

[0021] One of the first large side covering area and the second large side covering area is provided with a bottom covering area on the remaining side.

[0022] As an implementation, after the first small side covering area and the second small side covering area are folded, there is an overlapping area between them; and after the third small side covering area and the fourth small side covering area are folded, there is an overlapping area between them.

[0023] The utility model also provides a battery, including bare electric core group and above-mentioned battery top cover subassembly. Bare electric core group includes a plurality of bare electric core who sets side by side, the battery top cover subassembly sets up in the upper end of bare electric core group and is connected with bare electric core, the insulating film of battery top cover subassembly is wrapped bare electric core group.

[0024] As a realizable way, it further comprises a baffle, the two bare electric cores are arranged side by side, the tab of the two bare electric cores is bent towards each other to form an insertion port structure, and the baffle is inserted into the insertion port structure.

[0025] The above scheme can cancel the hot melting process of the insulating film and the lower plastic and improve production efficiency by pressing the end surface coating area of the insulating film between the lower plastic and the pole boss of the pole. BRIEF DESCRIPTION OF DRAWINGS

[0026] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the following drawings:

[0027] Figure 1 A structural schematic diagram of a battery provided by the utility model embodiment is shown in the figure.

[0028] Figure 2 A schematic diagram of the inside of a battery provided by the utility model embodiment is shown in the figure.

[0029] Figure 3 Is Figure 2 A sectional view is shown in the figure.

[0030] Figure 4 Is Figure 3 A local enlarged schematic diagram is shown in the figure.

[0031] Figure 5 A schematic diagram of the arrangement of the lower plastic, the end surface coating area and the pole boss provided by the utility model embodiment is shown in the figure.

[0032] Figure 6 A schematic diagram of the inside of a battery provided by the utility model embodiment is shown in the figure.

[0033] Figure 7 A schematic diagram of the structure of a pole provided by the utility model embodiment is shown in the figure.

[0034] Figure 8 A bottom view schematic diagram of the lower plastic provided by the utility model embodiment is shown in the figure.

[0035] Figure 9 A schematic diagram of the unfolding of an insulating film provided by the utility model embodiment is shown in the figure.

[0036] Pole 10, positive pole 10a, negative pole 10b, pole body 11, annular groove 111, pole boss 12;

[0037] Top cover body 20, first through hole 21, first liquid injection hole 22, explosion-proof valve mounting hole 23, first groove 24;

[0038] Lower plastic 30, second through hole 31, second liquid injection hole 32, second exhaust hole 33, fourth groove 34;

[0039] Explosion-proof valve 40, insulating film 50, end face covering area 51, third through hole 511, third liquid injection hole 512, third exhaust hole 513, third groove 514, first large side covering area 52, second large side covering area 53, first small side covering area 54, second small side covering area 55, third small side covering area 56, fourth small side covering area 57, bottom surface covering area 58, first crease 501, second crease 502, third crease 503, fourth crease 504, fifth crease 505, sixth crease 506;

[0040] Baffle 60, fourth liquid injection hole 61, fourth exhaust hole 62;

[0041] Naked electric core 70, positive pole lug 71, negative pole lug 72, embedded port structure c, upper plastic 80, second groove 81, sealing ring 91, rivet 92. DETAILED DESCRIPTION

[0042] The application will be described in further detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model, and are not a limitation on the utility model. In addition, it should be noted that only parts related to the utility model are shown in the drawings for ease of description.

[0043] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and embodiments.

[0044] At least refer to Figures 1-9 As shown in the drawings, the utility model example provides a battery top cover assembly, which comprises a pole 10, a top cover body 20 and a lower plastic 30.

[0045] As shown in the drawings, Figure 4 As shown in the drawings, the pole 10 comprises a pole body 11, and the rivets (92) are arranged between the pole body 11 and the top cover body 20. Figure 5 As shown in the drawings, the top cover body 20 is provided with a first through hole 21 for the pole body 11 to pass through. The lower plastic 30 is provided with a second through hole 31 for the pole body 11 to pass through.

[0046] Figure 6 andFigure 8 The overall shape of the insulating film 50 is shown, which is used at least to wrap the bare battery cell 70. The insulating film 50 includes an end-covering area 51, on which a third through hole 511 is provided for the column 11 to pass through. The top cover body 20, the lower plastic 30, and the insulating film 50 are stacked. The end of the column 11 near the insulating film 50 extends outward along its circumference to form a pole post protrusion 12.

[0047] The end of the column 11 near the insulating film 50 passes through the third through hole 511, the second through hole 31 and the first through hole 21 in sequence, and the end covering area 51 is pressed between the lower plastic 30 and the pole post boss 12.

[0048] Among them, such as Figure 6 As shown, the terminal 10 includes a positive terminal 10a and a negative terminal 10b.

[0049] like Figure 6 As shown, the top cover body 20 is provided with two first through holes 21, one explosion-proof valve mounting hole 23, and one first injection hole 22. The first through holes 21, the explosion-proof valve mounting hole 23, and the first injection hole 22 all penetrate the top cover body 20. The two first through holes 21 are arranged along the length of the top cover body 20. One first through hole 21 allows the column 11 of the positive electrode post 10a to pass through, and the other first through hole 21 allows the column 11 of the negative electrode post 10b to pass through. The explosion-proof valve mounting hole 23 and the first injection hole 22 are located between the two first through holes 21.

[0050] like Figure 6 As shown, the lower plastic 30 is provided with two second through holes 31, multiple second vent holes 33, and one second injection hole 32. The second through holes 31, second vent holes 33, and second injection hole 32 all penetrate the lower plastic 30. The multiple second vent holes 33 can be arranged in a rectangular array. The two second through holes 31 are arranged along the length of the lower plastic 30. One second through hole 31 allows the column 11 of the positive electrode post 10a to pass through, and the other second through hole 31 allows the column 11 of the negative electrode post 10b to pass through. The second vent hole 33 and the second injection hole 32 are located between the two second through holes 31.

[0051] The insulating film 50 is a Mylar film used to cover the bare cells 70 of the battery. For example, the battery includes a bare cell assembly, which includes multiple bare cells 70 arranged side by side. The insulating film 50 covers the bare cell assembly. A battery top cover assembly is disposed at the upper end of the bare cell assembly and connected to the bare cells 70.

[0052] The following embodiments illustrate a bare cell assembly comprising two bare cells 70 arranged side by side:

[0053] like Figure 6As shown, the bare cell group includes two bare cells 70 arranged side by side: a first bare cell and a second bare cell, the bare cells 70 width direction is same direction with the top cover body 20 width direction. The positive electrode tab 71 on the first bare cell and the positive electrode tab 71 on the second bare cell are folded towards each other to form one insertion structure c, and the negative electrode tab 72 on the first bare cell and the negative electrode tab 72 on the second bare cell are folded towards each other to form another insertion structure c. Among them, the pole boss 12 of the positive pole 10a is located at the top of one insertion structure c, and the pole boss 12 of the negative pole 10b is located at the top of the other insertion structure c.

[0054] The insulating film 50 includes an end face covering area 51 for covering the end face of the bare cell group. The end face covering area 51 is provided with two third through holes 511, a plurality of third exhaust holes 513 and a plurality of third liquid injection holes 512. The third through holes 511, the third exhaust holes 513 and the third liquid injection holes 512 all penetrate the end face covering area 51, the two third through holes 511 are arranged along the length direction of the end face covering area 51, and the third exhaust holes 513 and the third liquid injection holes 512 are located between the two third through holes 511.

[0055] One of the third through holes 511 is for the pole body 11 of the positive pole 10a to pass through, and the other third through hole 511 is for the pole body 11 of the negative pole 10b to pass through. The end face covering area 51 is in contact with the pole boss 12 of the positive pole 10a, and the pole boss 12 of the negative pole 10b.

[0056] Among them, as shown in Figure 4 and Figure 6 The lower plastic 30 is laminated and arranged on the end face covering area 51, and the top cover body 20 is laminated on the lower plastic 30. The explosion-proof valve mounting hole 23, the second exhaust hole 33 and the third exhaust hole 513 are correspondingly arranged, and the first liquid injection hole 22, the second liquid injection hole 32 and the third liquid injection hole 512 are correspondingly arranged.

[0057] The battery top cover assembly further comprises an explosion-proof valve 40 and an explosion-proof valve protection sheet (not labeled), the explosion-proof valve 40 is arranged between the top cover body 20 and the lower plastic 30, the explosion-proof valve 40 is installed in the explosion-proof valve mounting hole 23, and the explosion-proof valve protection sheet is arranged on the explosion-proof valve mounting hole 23.

[0058] In addition, as shown in Figure 6 The surface of the top cover body 20 away from the lower plastic 30 is also recessed with a first recess 24, and the upper plastic 80 is arranged in the first recess 24. As shown in Figure 4As shown, the other end of the column 11 of the positive electrode post 10a passes through the third through hole 511, the second through hole 31, the first through hole 21, and the upper plastic 80 on the left side in sequence, and protrudes from the surface of the top cover body 20 facing away from the lower plastic 30. The other end of the column 11 of the positive electrode post 10a is riveted to the upper plastic 80, which presses against the top cover body 20, and the top cover body 20 presses against the lower plastic 30, so that the left side of the end-covering area 51 is pressed between the lower plastic 30 and the electrode post boss 12 of the positive electrode post 10a. Similarly, the other end of the column 11 of the negative electrode post 10b passes through the third through hole 511, the second through hole 31, the first through hole 21, and the upper plastic 80 on the right side, and protrudes from the surface of the top cover body 20 facing away from the lower plastic 30. The other end of the column 11 of the negative electrode post 10b is riveted to the upper plastic 80, which presses against the top cover body 20, and the top cover body 20 presses against the lower plastic 30. In this way, the right side of the end cover area 51 is pressed between the lower plastic 30 and the electrode post protrusion 12 of the positive electrode post 10a.

[0059] In this embodiment, the insulating film 50 is pressed between the end-covering area 51 and the electrode boss 12 of the lower plastic 30 by pressing the end-covering area 51 of the insulating film 50. This eliminates the need for the hot-melt process between the insulating film 50 and the lower plastic 30, thus improving production efficiency. Since the insulating film 50 does not need to be hot-melt connected to the left or right side wall of the lower plastic 30, the thickness of the lower plastic 30 can be reduced, which in turn helps to reduce the overall thickness of the battery top cover assembly. Conversely, this can increase the height of the bare cell 70, thereby improving the battery specific energy.

[0060] Specifically, the other end of the column 11 of the positive electrode 10a and the other end of the column 11 of the negative electrode 10b are riveted to the upper plastic 80.

[0061] like Figure 4 and Figure 7 As shown, the end of the positive electrode post 10a away from the top cover body 20 is recessed inward along its circumference to form an annular groove 111. The upper plastic 80 on the left side is recessed on the surface opposite to the top cover body 20 to form a second groove 81. The annular groove 111 is located in the second groove 81. A rivet 92 is disposed in the second groove 81 and is inserted into the annular groove 111, thus realizing the riveting connection between the other end of the positive electrode post 10a's column 11 and the upper plastic 80.

[0062] The end of the negative electrode post 10b, away from the top cover body 20, is recessed inward along its circumference to form an annular groove 111. The upper plastic 80 on the right side is recessed on the surface opposite to the top cover body 20 to form a second groove 81. The annular groove 111 is located in the second groove 81. Another rivet 92 is disposed in the second groove 81 and is fitted into the annular groove 111, thus realizing the riveting connection between the other end of the negative electrode post 10b, the post 11, and the upper plastic 80.

[0063] In detail, the end face covering area 51 is pressed between the lower plastic 30 and the pole boss 12.

[0064] As shown in Figure 4 and Figure 6 , the end face covering area 51 protrudes towards the lower plastic 30 to form a third groove 514 on the surface of the insulation film 50 away from the lower plastic 30, the third groove 514 is adapted to the pole boss 12 of the positive pole 10a and the pole boss 12 of the negative pole 10b, and the third groove 514 is provided with the third through hole 511 on the groove bottom. Thus, the end face covering area 51 is provided with two third grooves 514, the pole body 11 of the positive pole 10a passes through the third through hole 511 and the groove bottom of the left third groove 514, and the groove bottom of the left third groove 514 is pressed on the pole boss 12 of the positive pole 10a; the pole body 11 of the negative pole 10b passes through the third through hole 511 and the groove bottom of the right third groove 514, and the groove bottom of the right third groove 514 is pressed on the pole boss 12 of the negative pole 10b.

[0065] As shown in Figure 4 , Figure 6 and Figure 8 , the surface of the lower plastic 30 towards the end face covering area 51 is recessed to form a fourth groove 34 corresponding to the protrusion of the end face covering area 51, and the fourth groove 34 is provided with the second through hole 31 on the groove bottom. The fourth groove 34 is adapted to the third groove 514, and the third groove 514 is arranged in the fourth groove 34. Thus, the surface of the lower plastic 30 towards the end face covering area 51 is provided with two fourth grooves 34, the left fourth groove 34 is arranged in the left third groove 514, and the groove bottom of the third groove 514 is arranged between the groove bottom of the fourth groove 34 and the pole boss 12 of the positive pole 10a. The right fourth groove 34 is arranged in the right third groove 514, and the groove bottom of the third groove 514 is arranged between the groove bottom of the fourth groove 34 and the pole boss 12 of the negative pole 10b. As shown in Figure 5 , the surface of the pole boss 12 in contact with the end face covering area 51 and the surface of the lower plastic 30 towards the end face covering area 51 are located in the same plane, and thus the thickness of the lower plastic 30 can be reduced, which further helps to reduce the overall thickness of the battery top cover assembly.

[0066] As an implementation manner, as shown in Figure 9 , the insulation film 50 further comprises a first large side covering area 52 and a second large side covering area 53. The first large side covering area 52 and the second large side covering area 53 are arranged on both sides of the end face covering area 51, respectively, and the first crease 501 is arranged at the connection between the first large side covering area 52 and the end face covering area 51, and the second crease 502 is arranged at the connection between the second large side covering area 53 and the end face covering area 51.

[0067] The first large side covering area 52 is folded by 90° along the first crease 501, for covering the front side of the bare battery cell group; the second large side covering area 53 is folded by 90° along the second crease 502, for covering the back side of the bare battery cell group.

[0068] The first small side covering area 54 and the second small side covering area 55 are respectively arranged at the two sides of the first large side covering area 52, and the directions of the first small side covering area 54 and the second small side covering area 55 are parallel to the extending direction of the first crease 501. The third crease 503 is arranged at the connecting position between the first small side covering area 54 and the first large side covering area 52, and the fourth crease 504 is arranged at the connecting position between the second small side covering area 55 and the first large side covering area 52.

[0069] The third small side covering area 56 and the fourth small side covering area 57 are respectively arranged at the two sides of the second large side covering area 53, and the directions of the third small side covering area 56 and the fourth small side covering area 57 are parallel to the extending direction of the second crease 502. The fifth crease 505 is arranged at the connecting position between the third small side covering area 56 and the second large side covering area 53, and the sixth crease 506 is arranged at the connecting position between the fourth small side covering area 57 and the second large side covering area 53.

[0070] The first small side covering area 54 is folded by 90° along the third crease 503, and the second small side covering area 55 is folded by 90° along the fourth crease 504. The first small side covering area 54 and the second small side covering area 55 jointly cover the left side of the bare battery cell group, and the first small side covering area 54 and the second small side covering area 55 have an overlapping area.

[0071] The third small side covering area 56 is folded by 90° along the fifth crease 505, and the fourth small side covering area 57 is folded by 90° along the sixth crease 506. The third small side covering area 56 and the fourth small side covering area 57 jointly cover the right side of the bare battery cell group, and the third small side covering area 56 and the fourth small side covering area 57 have an overlapping area.

[0072] The two overlapping areas are firmly fixed by the insulating adhesive tape, so as to realize the connection between the insulating film 50 and the bare battery cell group, and the production efficiency is improved compared with the connection of the overlapping areas by hot melting.

[0073] The remaining side of one of the first large side covering area 52 and the second large side covering area 53 is provided with a bottom covering area 58. The bottom covering area 58 is used for covering the bottom of the bare battery cell group.

[0074] As an implementable manner, the baffle 60 is inserted into the insertion port structure c.

[0075] As Figure 4 and Figure 6As shown, the length direction of the baffle 60 is the same as the length direction of the top cover body 20 and the lower plastic 30. One end of the baffle 60 is inserted into the left embedding structure c, and the other end is inserted into the right embedding structure c. The baffle 60 blocks the bending of the negative and positive pole tabs of the bare battery cell 70 towards the inside of the bare battery cell 70, avoids the short circuit problem, and helps to improve the safety performance of the battery.

[0076] A plurality of fourth exhaust holes 62 and a plurality of fourth liquid injection holes 61 are further arranged on the baffle 60. The fourth liquid injection holes 61 are arranged corresponding to the third liquid injection holes 512, and the fourth exhaust holes 62 are arranged corresponding to the third exhaust holes 513.

[0077] As an implementation manner, the battery top cover assembly further comprises a battery shell.

[0078] The bare battery cell group wrapped with the insulating film 50 is arranged in the battery shell, and the battery shell protects the bare battery cell group. The battery top cover assembly covers the opening of the battery shell.

[0079] As an implementation manner, the battery top cover assembly further comprises a sealing ring 91 arranged between the first through hole 21 and the column body 11 of the pole 10. The sealing ring 91 is sleeved on the column body 11 to improve the sealing performance of the battery top cover assembly.

[0080] The utility model example further provides a battery, the battery includes the battery top cover assembly described above. The battery has the advantages of the battery top cover assembly, and therefore will not be described again.

[0081] It should be understood that the above-mentioned terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, structure and operation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0082] The above description is merely the preferred embodiments of the present application and the technical principles used. It should be understood by those skilled in the art that the scope of the utility model involved in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by the above technical features or equivalent features in any combination without departing from the concept of the utility model. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. A battery top cover assembly, characterized by, The application relates to a polar column (10) comprising a column body (11), a top cover body (20) provided with a first through hole (21) for the column body (11) to pass through, a lower plastic (30) provided with a second through hole (31) for the column body (11) to pass through, and an insulation film (50) used for at least wrapping a bare battery core (70), wherein the insulation film (50) comprises an end face covering area (51) provided with a third through hole (511) for the column body (11) to pass through. The top cover body (20), the lower plastic (30) and the insulation film (50) are stacked, and the column body (11) sequentially passes through the third through hole (511), the second through hole (31) and the first through hole (21). The end of the column body (11) close to the insulation film (50) extends outward along the circumference to form a polar column boss (12), and the end of the column body (11) away from the top cover body (20) is recessed along the circumference to form an annular groove (111). At least part of a riveting piece (92) arranged around the column body (11) is embedded and matched with the annular groove (111), so that the top cover body (20), the lower plastic (30) and the insulation film (50) are positioned between the riveting piece (92) and the polar column boss (12). The end face covering area (51) protrudes towards the lower plastic (30) to form a third groove (514) on the surface of the insulation film (50) away from the lower plastic (30), and the third groove (514) is provided with the third through hole (511) at the groove bottom. The lower plastic (30) is recessed on the surface facing the end face covering area (51) to form a fourth groove (34) corresponding to the protrusion of the end face covering area (51), and the fourth groove (34) is provided with the second through hole (31) at the groove bottom. The third groove (514) groove bottom is pressed between the fourth groove (34) groove bottom and the polar column boss (12). The surface of the polar column boss (12) in contact with the end face covering area (51) is in the same plane as the surface of the lower plastic (30) facing the end face covering area (51).

2. The battery header assembly of claim 1, wherein, The application further comprises an upper plastic (80) clamped between the top cover body (20) and the riveting piece (92). The surface of the upper plastic (80) away from the top cover body (20) is recessed to form a second groove (81), the annular groove (111) is located in the second groove (81), the riveting piece (92) is arranged in the second groove (81), and the riveting piece (92) is embedded and matched with the annular groove (111). The end face covering area (51) is provided with a third exhaust hole (513) and a third liquid injection hole (512).

3. The battery header assembly of claim 2, wherein, ​ 4. The battery header assembly of claim 1, wherein, ​ 5. The battery header assembly of claim 4, wherein, ​ 6. The battery header assembly of any one of claims 1-5, wherein, ​ 7. The battery cover assembly of any one of claims 1-5, wherein, The insulating film (50) further comprises a first large side covering area (52) and a second large side covering area (53), the first large side covering area (52) and the second large side covering area (53) are respectively arranged on both sides of the end surface covering area (51), The first large side covering area (52) is respectively provided with a first small side covering area (54) and a second small side covering area (55) on both sides, and the second large side covering area (53) is respectively provided with a third small side covering area (56) and a fourth small side covering area (57) on both sides, and one of the first large side covering area (52) and the second large side covering area (53) is provided with a bottom surface covering area (58) on the remaining side.

8. The battery header assembly of claim 7, wherein, The first small side covering area (54) and the second small side covering area (55) overlap after folding; The third small side covering area (56) and the fourth small side covering area (57) overlap after folding.

9. A battery, characterized by The battery top cover assembly of any one of claims 1-8, wherein the bare cell group comprises a plurality of bare cells (70) arranged side by side, the battery top cover assembly is arranged at the upper end of the bare cell group and connected with the bare cells (70), and the insulating film (50) of the battery top cover assembly wraps the bare cell group.

10. The battery of claim 9, wherein, Further comprising a baffle (60), two bare cells (70) are arranged side by side, the tabs of the two bare cells (70) are folded towards each other to form an insertion structure (c), and the baffle (60) is inserted into the insertion structure (c).

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