CN217740657U - Battery cell - Google Patents

Abstract

The utility model provides an electric core, include: a housing having an installation space and an opening communicating with the installation space; the end cover comprises an end cover main body, a connecting plate and an insulating piece, wherein the insulating piece is arranged on the outer side of the circumferential direction of the end cover main body; roll up the core, set up in installation space, roll up core and end cover main part electric connection. Use the technical scheme of the utility model the problem of easy fracture between end cover and the shell in the correlation technique can be solved effectively.

Description

Battery cell

Technical Field

The utility model relates to a field is made to electric core particularly, relates to an electric core.

Background

Cylindrical cells typically include end caps and a housing sealingly connected to the end caps. In the related art, an insulating sealing ring is sleeved at the circumferential edge of the end cover, and the end cover and the insulating sealing ring are clamped by the shell in a covered edge compression joint mode, so that the shell and the end cover are insulated and sealed.

Because insulating seal cover establishes the circumference border at the end cover, and the end cover can't adopt modes such as welding that the high temperature heating is fixed to be connected with the shell, because the high temperature that the welding produced can melt insulating seal to lose the insulating effect between end plate and the shell, lead to the cylinder electricity core short circuit. However, the connection and fastening degree of the end cover and the shell is limited due to the adoption of the edge-covering crimping mode, when the cylindrical battery cell is a high-power battery cell, the internal pressure of the expanded cylindrical battery cell is higher, and the end cover and the shell are easy to crack due to the adoption of the edge-covering crimping mode.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an electrical core to solve the problem of easy cracking between the end cap and the housing of the electrical core in the related art.

In order to achieve the above object, the utility model provides an electric core, include: a housing having an installation space and an opening communicating with the installation space; the end cover comprises an end cover main body, a connecting plate and an insulating piece, wherein the insulating piece is arranged on the outer side of the circumferential direction of the end cover main body; roll up the core, set up in installation space, roll up core and end cover main part electric connection.

Furthermore, a first annular slot is formed in the inner side wall of the insulating part, the end cover main body comprises a first inserting part, and the first inserting part is in limit fit in the first annular slot; the lateral wall of insulating part is provided with second annular slot, and the connecting plate includes second grafting portion, and the spacing cooperation of second grafting portion is in second annular slot.

Furthermore, a first micropore structure is formed on the surface of the first plug part, and the insulating part is embedded into the first micropore structure; and/or the surface of the second inserting part forms a second microporous structure, and the insulating part is embedded into the second microporous structure.

Furthermore, a first rotation stopping structure is arranged between the first inserting part and the groove wall of the first annular slot; and/or a second rotation stopping structure is arranged between the second inserting part and the groove wall of the second annular slot.

Furthermore, the first rotation stopping structure comprises a first rotation stopping groove and a first rotation stopping protrusion located in the first rotation stopping groove, one of the first rotation stopping groove and the first rotation stopping protrusion is arranged on the first inserting portion, and the other of the first rotation stopping groove and the first rotation stopping protrusion is arranged in the first annular inserting groove.

Furthermore, the second rotation stopping structure comprises a second rotation stopping groove and a second rotation stopping protrusion positioned in the second rotation stopping groove, one of the second rotation stopping groove and the second rotation stopping protrusion is arranged on the second inserting part, and the other of the second rotation stopping groove and the second rotation stopping protrusion is arranged in the second annular slot.

Furthermore, an annular convex rib is arranged on the second insertion part, and an annular retaining groove matched with the annular convex rib is arranged in the second annular slot.

Further, the junction of the lateral wall of connecting plate and the diapire of connecting plate is provided with the stair structure, and the stair structure is located the one end that the insulating part was kept away from to the connecting plate, and the connecting plate passes through the spacing cooperation of stair structure and casing.

Furtherly, stair structure includes direction section, annular step face and the cylinder of being connected with the interior border of annular step face, and the outer border of annular step face is connected with the lateral wall of connecting plate, and the direction section setting is kept away from one side of annular step face at the cylinder, and is connected with the diapire of connecting plate, and the terminal surface butt of annular step face and casing, the spacing cooperation of the inside wall of cylinder and casing, direction section are circular-arc or bevel shape.

Further, the insulating member includes: first crown plate, second crown plate and set up and connect the riser between first crown plate and second crown plate, form first annular slot between the inner wall of first crown plate, second crown plate and connection riser, form second annular slot between the outer wall of first crown plate, second crown plate and connection riser.

Further, the end cover main part is the conductor, and the end cover main part includes roll core contact site and protrusion in the annular boss portion that roll core contact site set up, and first grafting portion is located the circumference outside of annular boss portion, rolls up core contact site and roll up core electric connection.

Use the technical scheme of the utility model, the end cover includes end cover main part, connecting plate and insulating part, and the end cover main part is the major structure of end cover, and the connecting plate is used for being connected with the casing of electric core, and the insulating part setting plays the effect that makes end cover main part and connecting plate insulating between end cover main part and connecting plate. The end cover of this embodiment has changed the structure of establishing insulating seal circle at the circumference border cover of end cover of electric core among the correlation technique, sets up the insulating part between end cover main part and connecting plate, sets the metal material to the connecting plate simultaneously, and this kind of mode of setting makes the connecting plate can with casing welded connection to strengthen the joint strength of end cover and casing, make between end cover and the casing difficult fracture, and then promote the intensity of electric core.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a cross-sectional view of a first exemplary embodiment of an end cap of a battery cell according to the present disclosure;

FIG. 2 shows an enlarged schematic view of the end cap of FIG. 1 at A;

FIG. 3 shows a split-structure schematic of the end cap of FIG. 1;

FIG. 4 shows a perspective view of another embodiment of a web of the end closure of FIG. 1;

fig. 5 shows a cross-sectional view of an embodiment two of an end cap according to the invention;

FIG. 6 shows an enlarged schematic view of the end cap of FIG. 5 at B;

fig. 7 shows an exploded schematic view of a cell according to the present invention;

fig. 8 shows a cross-sectional view of the cell of fig. 7;

fig. 9 shows an enlarged schematic structure at C of fig. 7.

Wherein the figures include the following reference numerals:

10. an end cap body; 11. a first insertion part; 12. a roll core contact portion; 13. an annular boss portion; 20. a connecting plate; 21. a second insertion part; 211. an annular convex rib; 22. a step structure; 221. an annular step surface; 222. a cylindrical surface; 2221. a guide section; 30. an insulating member; 31. a first annular slot; 32. a second annular slot; 33. a first ring plate; 34. a second ring plate; 35. connecting a vertical plate; 40. a first rotation stopping structure; 41. a first rotation stopping groove; 42. a first rotation stop protrusion; 50. a second rotation stop structure; 51. a second rotation stopping groove; 52. a second rotation stop protrusion; 60. a housing; 70. an end cap; 90. and (6) winding cores.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in 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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.

As shown in fig. 1, fig. 3, fig. 7, and fig. 8, the battery cell of the first embodiment includes: a case 60, an end cap 70, and a winding core 90, wherein the case 60 has an installation space and an opening communicating with the installation space; the end cover 70 comprises an end cover main body 10, a connecting plate 20 and an insulating piece 30, wherein the insulating piece 30 is arranged on the outer side of the circumference of the end cover main body 10, the connecting plate 20 is arranged on the outer side of the circumference of the insulating piece 30, the connecting plate 20 is connected with the shell 60, and the end cover main body 10, the connecting plate 20 and the insulating piece 30 jointly plug the opening; roll up core 90, set up in installation space, roll up core 90 and end cover main part 10 electric connection.

By applying the technical solution of this embodiment, the end cap 70 includes an end cap main body 10, a connecting plate 20 and an insulating member 30, the end cap main body 10 is a main body structure of the end cap, the connecting plate 20 is used to connect with the casing 60 of the battery cell, and the insulating member 30 is disposed between the end cap main body 10 and the connecting plate 20, so as to achieve an effect of insulating and connecting the end cap main body 10 and the connecting plate 20. The end cover of this embodiment has changed the structure of establishing insulating seal circle at the circumference border cover of end cover of electric core among the correlation technique, sets up insulating part 30 between end cover main part 10 and connecting plate 20, sets connecting plate 20 and casing 60 to the metal material simultaneously, and this kind of set up mode makes connecting plate 20 can with casing 60 welded connection to strengthen the joint strength of end cover and casing 60, make difficult fracture between end cover and the casing 60, and then promote the intensity of electric core.

In addition, when the end cap and the housing are connected by using the edge-covered crimping method in the related art, an inwardly recessed support platform needs to be disposed on a side wall of the housing, a crimping portion is formed on a side wall of a top of the support platform, an installation space is formed between the support platform and the crimping portion, and the end cap and the insulating seal ring are sandwiched between the support platform and the crimping portion. This kind of mode of setting up needs to form the brace table between the utmost point ear of end cover and book core, and the brace table can occupy certain space on the axial direction of electric core, leads to the energy density of electric core to be littleer, influences the performance of electric core. The structure of the end cover of this embodiment is adopted, and end cover and casing are connected to the mode that adopts casing and annular connecting plate direct weld, need not set up the brace table on the lateral wall of casing for the end cover can be closer to with the setting of rolling up the core, thereby is favorable to promoting the energy density of electric core.

It should be noted that the battery cell is a cylindrical battery cell.

As shown in fig. 1, in the first embodiment, the inner side wall of the insulating member 30 is provided with a first annular slot 31, the end cap body 10 includes a first insertion part 11, and the first insertion part 11 is in limit fit in the first annular slot 31; the outer side wall of the insulating member 30 is provided with a second annular slot 32, the connecting plate 20 comprises a second insertion part 21, and the second insertion part 21 is in limit fit in the second annular slot 32. In the above structure, the first annular slot 31 is disposed on the inner side wall of the insulating member 30, and the first insertion portion 11 of the end cap body 10 extends into the first annular slot 31, so that the contact area between the insulating member 30 and the end cap body 10 can be increased by the arrangement mode, and the sealing performance between the insulating member 30 and the end cap body 10 can be ensured. Accordingly, the second insertion portion 21 extends into the second annular insertion groove 32 to ensure the sealing between the connection plate 20 and the insulation member 30.

It should be noted that, in the first embodiment, the insulating member 30 is formed by nano-injection molding. Specifically, as shown in fig. 2, in the first embodiment, the insulating member 30 includes: the first annular plate 33, the second annular plate 34 and the vertical connecting plate 35 are arranged between the first annular plate 33 and the second annular plate 34, a first annular slot 31 is formed between the inner walls of the first annular plate 33, the second annular plate 34 and the vertical connecting plate 35, and a second annular slot 32 is formed between the outer walls of the first annular plate 33, the second annular plate 34 and the vertical connecting plate 35. Injection molding glue is injected into the gap between the end cover main body 10 and the connecting plate 20, the injection molding glue entering the gap between the end cover and the roll core is solidified to form a second annular plate 34, the injection molding glue located in the gap is solidified to form a connecting vertical plate 35, and the injection molding glue located above the end cover is solidified to form a first annular plate 33. The above structure can ensure the connection strength between the end cap body 10, the connecting plate 20 and the insulating member 30 while achieving the insulating and sealing effect.

Of course, in other embodiments, the insulating member may also be a ceramic member that is separately disposed, and the first insertion portion, the second insertion portion, and the ceramic member are hermetically connected by soldering. Alternatively, the insulator may be formed of a strong insulating paste.

As shown in fig. 1, in the first embodiment, a surface of the first inserting part 11 forms a first micro-pore structure, and the insulating member 30 is embedded in the first micro-pore structure. In the above structure, the first micro holes are etching holes, which function to increase the roughness of the surface of the first mating part 11. Because the insulating member 30 of the present embodiment is formed by injecting glue in a nano injection molding manner, the injection molding glue in a flowing state can penetrate into the first micropore area, so that the connection strength between the first inserting part 11 and the insulating member 30 is increased. The above-mentioned "surface of the first mating part 11" may refer to a partial area of the surface of the first mating part 11, or may refer to the entire area of the surface of the first mating part 11.

Accordingly, the surface of the second socket part 21 forms a second micro-porous structure, and the insulating member 30 is embedded in the second micro-porous structure. The second micro-hole is a recessed hole, which has the same function as the first micro-hole, and can also have an effect of increasing the connection strength between the second insertion part 21 and the insulating member 30. The above-mentioned "surface of the second mating part 21" may refer to a partial area of the surface of the second mating part 21, or may refer to the entire area of the surface of the second mating part 21.

As shown in fig. 1, in the first embodiment, a step structure 22 is provided at the junction of the side wall of the connecting plate 20 and the bottom wall of the connecting plate 20, the step structure 22 is located at an end of the connecting plate 20 away from the insulating member 30, and the connecting plate 20 is in limit fit with the housing 60 through the step structure 22. Specifically, as shown in fig. 1, in the present embodiment, the step structure 22 includes a guide section 2221, an annular step surface 221, and a cylindrical surface 222 connected to an inner edge of the annular step surface 221, an outer edge of the annular step surface 221 is connected to a side wall of the connecting plate 20, the guide section 2221 is disposed on a side of the cylindrical surface 222 away from the annular step surface 221, and is connected to a bottom wall of the connecting plate 20, the annular step surface 221 abuts against an end surface of the housing 60, the cylindrical surface 222 is in limit fit with an inner side wall of the housing 60, and the guide section 2221 is in an arc shape or an oblique angle shape. In the above structure, the guide section 2221 is advantageous in that it plays a role of guiding when the end plate is placed at the opening of the housing 60. In addition, the upper surface of the side wall of the housing 60 can abut against the annular step surface 221, and the inner surface of the side wall of the housing 60 can abut against the cylindrical surface 222, so that the end cover and the side wall of the housing 60 can be in limit fit, and a gap between the end cover and the housing 60 after the end cover is covered on the housing 60 is avoided, and subsequent welding processes are not affected.

As shown in fig. 1, in the first embodiment, the end cap body 10 is a conductor, the end cap body 10 includes a winding core contact portion 12 and an annular boss portion 13 protruding from the winding core contact portion 12, the first mating portion 11 is located on the circumferential outer side of the annular boss portion 13, and the winding core contact portion 12 is electrically connected to the winding core 90. In the structure, the winding core 90 is directly electrically connected with the end cover main body 10, the annular boss part 13 is electrically connected with an external conductive piece (such as a bus bar), and the end cover main body 10 forms a connecting terminal for connecting the winding core 90 with the external conductive piece, so that the end cover main body 10 of the winding core 90 is directly connected, the step of arranging a current collecting disc between the winding core 90 and the end cover main body 10 is omitted, the processing technology of the cylindrical battery cell is simplified, and the production cost is reduced. In addition, the contact surface between the roll core contact part 12 and the roll core 90 is large, so that the internal resistance of the cylindrical battery cell is effectively reduced, and the over-current capability of the cylindrical battery cell is improved.

The winding core contact portion 12 may be provided with a pressure limiting valve and a liquid injection hole.

As shown in fig. 1 and 2, in the first embodiment, the annular boss portion 13 protrudes from the insulating member 30. In the above-described structure in which the annular boss portion 13 is used for connecting the external conductive member, if the height of the insulating member 30 exceeds the annular boss portion 13, the insulating member 30 and the external connecting member interfere with each other, and thus making the height of the annular boss portion 13 larger than the height of the insulating member 30 can facilitate the installation of the external connecting member.

As shown in fig. 5 and 6, the present application also provides a second embodiment of the end cap, which differs from the end cap of the first embodiment in that: in the second embodiment, a first rotation stopping structure 40 is arranged between the first inserting part 11 and the groove wall of the first annular insertion groove 31; a second rotation stopping structure 50 is disposed between the second inserting portion 21 and the groove wall of the second annular slot 32. The structure can realize the rotation stopping fit of the end cover main body 10 and the insulating piece 30 and the rotation stopping fit of the connecting plate 20 and the insulating piece 30, so that the end cover main body 10 and the insulating piece 30 and the connecting plate 20 and the insulating piece 30 are connected more tightly, and the strength of the end cover is further improved.

As shown in fig. 5 and fig. 6, in the second embodiment, the first rotation stopping structure 40 includes a first rotation stopping groove 41 and a first rotation stopping protrusion 42 located in the first rotation stopping groove 41, the first rotation stopping groove 41 is disposed on the first inserting portion 11, and the first rotation stopping protrusion 42 is disposed in the first annular slot 31, the structure is simple, the processing is convenient, when the insulation member 30 is formed by injection molding, the injection molding glue can flow into the first rotation stopping groove 41, and the injection molding glue forms the first rotation stopping protrusion 42 after being solidified, so that rotation stopping matching with the end cover main body 10 is achieved.

Accordingly, as shown in fig. 5 and fig. 6, in the second embodiment, the second rotation stopping structure 50 includes a second rotation stopping groove 51 and a second rotation stopping protrusion 52 located in the second rotation stopping groove 51, the second rotation stopping groove 51 is disposed on the second plug-in part 21, and the second rotation stopping protrusion 52 is disposed in the second annular insertion groove 32. In the above structure, the second rotation stopping protrusion 52 is formed in the same manner as the first rotation stopping protrusion 42, the structure is simple, the processing is convenient, and the rotation stopping matching between the connecting plate 20 and the insulating member 30 can be realized.

Of course, in other embodiments, the first rotation stopping protrusion 42 may be disposed on the first insertion part 11, and the first rotation stopping groove 41 is disposed in the first annular insertion groove 31. The second rotation stop projection 52 may be provided on the second socket part 21, and the second rotation stop groove 51 is provided in the second annular insertion groove 32.

In addition, as shown in fig. 4, in other embodiments, an annular rib 211 may be further disposed on the second insertion portion 21, and an annular retaining groove disposed in cooperation with the annular rib 211 is disposed in the second annular insertion groove 32. The above structure can restrict the relative movement of the connection plate 20 and the insulation member 30 in the radial direction, thereby further improving the connection stability between the connection plate 20 and the insulation member 30.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; above" may include both orientations "at 8230; \8230; above" and "at 8230; \8230; below". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A battery cell, comprising:

a housing (60) having an installation space and an opening communicating with the installation space;

the end cover (70) comprises an end cover main body (10), a connecting plate (20) and an insulating piece (30), the insulating piece (30) is arranged on the circumferential outer side of the end cover main body (10), the connecting plate (20) is arranged on the circumferential outer side of the insulating piece (30), the connecting plate (20) is connected with the shell (60), and the end cover main body (10), the connecting plate (20) and the insulating piece (30) jointly block the opening;

roll up core (90), set up in the installation space, roll up core (90) with end cover main part (10) electric connection.

2. The cell of claim 1, wherein,

a first annular slot (31) is formed in the inner side wall of the insulating piece (30), the end cover main body (10) comprises a first inserting part (11), and the first inserting part (11) is in limited fit in the first annular slot (31);

the outer side wall of the insulating piece (30) is provided with a second annular slot (32), the connecting plate (20) comprises a second inserting portion (21), and the second inserting portion (21) is in limited fit in the second annular slot (32).

3. The cell of claim 2, wherein,

the surface of the first plugging part (11) forms a first microporous structure, and the insulating part (30) is embedded into the first microporous structure; and/or the presence of a gas in the gas,

the surface of the second plug part (21) forms a second microporous structure, and the insulating piece (30) is embedded into the second microporous structure.

4. The cell of claim 2, wherein,

a first rotation stopping structure (40) is arranged between the first inserting part (11) and the groove wall of the first annular slot (31); and/or

A second rotation stopping structure (50) is arranged between the second inserting part (21) and the groove wall of the second annular slot (32).

5. The cell of claim 4, wherein,

the first rotation stopping structure (40) comprises a first rotation stopping groove (41) and a first rotation stopping protrusion (42) located in the first rotation stopping groove (41), one of the first rotation stopping groove (41) and the first rotation stopping protrusion (42) is arranged on the first inserting portion (11), and the other one of the first rotation stopping groove (41) and the first rotation stopping protrusion (42) is arranged in the first annular slot (31).

6. The battery cell of claim 4, wherein the second rotation stop structure (50) comprises a second rotation stop groove (51) and a second rotation stop protrusion (52) located in the second rotation stop groove (51), one of the second rotation stop groove (51) and the second rotation stop protrusion (52) is disposed on the second insertion portion (21), and the other of the second rotation stop groove (51) and the second rotation stop protrusion (52) is disposed in the second annular insertion groove (32).

7. The battery cell of claim 2, wherein an annular rib (211) is disposed on the second plug-in portion (21), and an annular retaining groove disposed in cooperation with the annular rib (211) is disposed in the second annular insertion groove (32).

8. The battery cell of claim 1, wherein a step structure (22) is arranged at the joint of the side wall of the connecting plate (20) and the bottom wall of the connecting plate (20), the step structure (22) is located at one end of the connecting plate (20) far away from the insulating member (30), and the connecting plate (20) is in limit fit with the shell (60) through the step structure (22).

9. The battery cell of claim 8, wherein the step structure (22) comprises a guide section (2221), an annular step surface (221), and a cylindrical surface (222) connected to an inner edge of the annular step surface (221), an outer edge of the annular step surface (221) is connected to a side wall of the connection plate (20), the guide section (2221) is disposed on a side of the cylindrical surface (222) away from the annular step surface (221), and is connected to a bottom wall of the connection plate (20), the annular step surface (221) is abutted to an end surface of the casing (60), the cylindrical surface (222) is in limit fit with an inner side wall of the casing (60), and the guide section (2221) is arc-shaped or oblique-angle-shaped.

10. The cell of claim 2, wherein the insulator (30) comprises: the connecting structure comprises a first annular plate (33), a second annular plate (34) and a connecting vertical plate (35) arranged between the first annular plate (33) and the second annular plate (34), wherein a first annular slot (31) is formed among the first annular plate (33), the second annular plate (34) and the inner wall of the connecting vertical plate (35), and a second annular slot (32) is formed among the first annular plate (33), the second annular plate (34) and the outer wall of the connecting vertical plate (35).

11. The battery cell of claim 2, wherein the end cap body (10) is a conductor, the end cap body (10) comprises a winding core contact part (12) and an annular boss part (13) protruding from the winding core contact part (12), the first insertion part (11) is located on the outer side of the annular boss part (13) in the circumferential direction, and the winding core contact part (12) is electrically connected with the winding core (90).

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