End cover, battery monomer and battery pack

Abstract

The invention relates to an end cover, a battery monomer and a battery pack, the end cover comprises a cover body and a pole, the cover body is provided with an inner side and an outer side which are oppositely arranged along the thickness direction of the cover body, the inner side of the cover body is used for facing the interior of the battery monomer, and the end cover is provided with a pole hole which is communicated with the inner side of the cover body and the outer side of the cover body. The pole column is arranged in the pole column hole and comprises a first inserting part arranged towards the outer side of the cover body, the first inserting part is used for being connected with a connecting plug of the battery monomer in an inserting manner, and the connecting plug is used for being connected with a wiring harness plate on the battery pack in an inserting manner. According to the technical scheme, the packing efficiency of the battery pack can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to end covers, battery cells and battery packs. Background Art

[0002] Lithium battery packaging usually involves welding the poles and tabs of a single battery cell, then connecting the tabs of multiple battery cells together through wiring harnesses to form a module, and finally packaging them to provide power to the outside. The battery packaging process is time-consuming and labor-intensive, and the production efficiency is low. Summary of the invention

[0003] Based on this, it is necessary to provide an end cover, a battery cell and a battery pack to address the problem that battery packing is time-consuming, labor-intensive and has low production efficiency.

[0004] In a first aspect, the present application provides an end cap for a battery cell, the end cap comprising:

[0005] A cover body having an inner side and an outer side disposed opposite to each other in a thickness direction thereof, wherein the inner side of the cover body is disposed facing the interior of the battery cell, and the end cover has a pole hole connecting the inner side of the cover body and the outer side of the cover body; and

[0006] The pole is arranged in the pole hole, and comprises a first plug-in portion arranged toward the outside of the cover body, wherein the first plug-in portion is used to be plugged with a first external structure to electrically connect the first external structure and the pole.

[0007] In some embodiments, the first plug-in portion includes a plug-in recess for plugging with the first external structure along the thickness direction.

[0008] In some embodiments, the pole includes a conductive bottom plate and a conductive row, the conductive bottom plate is located on the inner side of the cover, and the conductive row is arranged on the conductive bottom plate and penetrates the pole hole;

[0009] The two conductive rows are spaced apart in a first direction intersecting the thickness direction, and together with the conductive bottom plate form a plug-in slot serving as the plug-in recess.

[0010] In some embodiments, the conductive row and the conductive base plate are integrally formed; or, one of the conductive row and the conductive base plate is provided with a convex bump, and the other is provided with a concave hole, and the convex bump and the concave hole are positioned and plugged along the thickness direction and welded to each other.

[0011] In some embodiments, the end cover further comprises a first insulating sleeve insulated between the cover body and the pole, and the pole hole is arranged in the first insulating sleeve and is penetrated along the thickness direction;

[0012] The first insulating sleeve includes a clamping portion, which is located on the outer side of the cover body and is used for clamping the first external structure.

[0013] In some embodiments, the snap-fitting portion includes a snap-fitting slot, which includes a first hole segment and a second hole segment that are adjacent and connected in the thickness direction, the minimum hole diameter of the first hole segment is smaller than the minimum hole diameter of the second hole segment, and the first hole segment serves as a notch of the snap-fitting slot and is located on the side of the second hole segment that is away from the inner side of the cover body.

[0014] In some embodiments, the pole forms a limiting groove open toward the hole wall of the pole hole, the hole wall of the pole hole protrudes toward the limiting groove to form a protrusion, and the protrusion is connected to the limiting groove in a concave-convex matching manner.

[0015] In some embodiments, a countersunk hole is formed inwardly at one end of the inner side of the pole hole facing away from the cover body, the protrusion is protruding relative to the hole wall of the countersunk hole, and the pole has a bent edge bent toward the hole wall of the countersunk hole, and the bent edge forms a groove side wall of the limiting groove that abuts against the protrusion in the thickness direction.

[0016] When assembling the battery pack, the end cap can be connected to the first external structure through the first plug-in portion of the pole on the end cap, so as to quickly realize the electrical connection between the first external structure and the pole. Compared with the prior art, in which the pole needs to be connected to the external conductive structure by welding, the technical solution of the present application is more convenient to operate, saves time and labor, and can improve the production efficiency of the battery pack.

[0017] In a second aspect, the present application provides a battery cell, comprising:

[0018] An end cap as described in any of the above embodiments;

[0019] A shell body, which is assembled on the inner side of the cover body and forms a receiving cavity together with the cover body;

[0020] an electrode assembly, located in the accommodating cavity, comprising a pole ear electrically connected to the pole; and

[0021] A connecting plug is arranged on the outer side of the cover body, and includes a second plug-in portion and a third plug-in portion that are conductively connected. The second plug-in portion is plugged into the first plug-in portion, and the third plug-in portion is used to be plugged into the second external structure to electrically connect the second external structure and the pole.

[0022] In some embodiments, the connecting plug includes a second insulating sleeve, the second plug-in portion and the third plug-in portion are partially arranged inside the second insulating sleeve and are conductively connected, and the remaining portions extend out of the second insulating sleeve; the remaining portion of the second plug-in portion extends toward the cover body, and the remaining portion of the third plug-in portion extends away from the cover body.

[0023] In some embodiments, the second insulating sleeve includes a buckle, and the buckle and the remaining part of the second plug-in portion are both located at an end of the second insulating sleeve facing the cover body;

[0024] The end cover comprises a first insulating sleeve insulated between the pole and the cover body, the first insulating sleeve comprises a clamping portion located outside the cover body, and the buckle is clamped with the clamping portion.

[0025] In some embodiments, a receiving groove is provided at one end of the second insulating sleeve facing the cover body, the buckle is located in the receiving groove, the second plug-in portion passes through the receiving groove, and the receiving groove covers the first insulating sleeve.

[0026] In some embodiments, the electrode assembly has a tab end disposed facing the cover body, the tab is disposed at the tab end, and has a welding section that can be bent relative to a first edge of the tab end;

[0027] The two electrode assemblies are arranged side by side along a first direction intersecting the thickness direction to form an electrode group, and the two welding segments with the same polarity in the same electrode group are respectively welded to two adjacent parts of the same pole in the first direction;

[0028] In the same electrode group, the two first edges are arranged at the two adjacent ends of the two electrode components in the first direction, and each welding section is folded in half and arranged in two layers between the corresponding electrode component and the cover body; or, in the same electrode group, the two first edges are arranged at the two opposite ends of the two electrode components in the first direction, and each welding section is arranged in one layer between the corresponding electrode component and the cover body.

[0029] The battery cell has a plug-in connection method for its pole and the connection plug, which has high battery cell assembly efficiency. Moreover, when assembled into a battery pack, each battery cell can be electrically connected to the wiring harness board of the battery pack through the connection plug on it, which can improve the battery pack assembly efficiency.

[0030] In a third aspect, the present application provides a battery pack, comprising:

[0031] Box;

[0032] A battery cell as described in any of the above embodiments, wherein a plurality of the battery cells are accommodated in the box; and

[0033] The wiring harness plate is arranged on the same side of the plurality of battery cells and is arranged opposite to the connection plug; the wiring harness plate comprises a plurality of docking terminals, each of which is electrically connected to the third plug-in portion.

[0034] When assembling the above-mentioned battery pack, the docking terminal of the wiring harness board is directly connected with the third plug-in part on the battery cell, and then loaded into the box. This not only realizes the signal collection of the battery cell by the wiring harness board, but also is convenient to operate and has high battery pack assembly efficiency, which can greatly improve the battery pack packaging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0036] Figure 1 Schematic diagram of the structure of battery cells in some embodiments.

[0037] Figure 2 for Figure 1 A schematic diagram of the partial structure of a battery cell is shown.

[0038] Figure 3 Schematic diagram of the structure of the end cover of some embodiments.

[0039] Figure 4 for Figure 3 Bottom view of the end cap shown.

[0040] Figure 5 Schematic diagram of the structure of poles in some embodiments.

[0041] Figure 6 2 is a cross-sectional view of a pole according to some embodiments.

[0042] Figure 7 for Figure 6 Exploded view of the pole shown.

[0043] Figure 8 for Figure 3 Exploded view of the end cap shown.

[0044] Fig. 9 Schematic diagram of the structure of the first insulating sleeve in some embodiments.

[0045] Fig.10 A partial cross-sectional view of an end cap according to some embodiments.

[0046] Fig.11 Schematic diagram of the cooperation between the connecting plug and the end cover in the battery cell of some embodiments.

[0047] Fig.12 Schematic diagram of the appearance of the connecting plug in some embodiments.

[0048] Fig.13 for Fig.12 A cross-sectional view of the connecting plug is shown.

[0049] Fig.14 for Fig.12 A schematic diagram of the partial structure of the connecting plug is shown.

[0050] Fig.15 Schematic diagram of the electrode assembly and the end cover after welding in some embodiments.

[0051] Fig.16 for Fig.15 A side view of the structure shown.

[0052] Fig.17 for Fig.15 Another side view of the structure shown.

[0053] Fig.18 Schematic diagram of an exploded view of a battery pack according to some embodiments.

[0054] The reference numerals in the specific implementation manner are as follows:

[0055] 1000, battery pack; 100, battery cell; 200, box; 300, wiring harness plate; 301, docking terminal; 10, end cover; X, thickness direction; Y, first direction; Z, second direction; 11, cover; i, inside; u, outside; 11a, hole structure; 11b, injection hole; 12, pole; c1, first plug-in part; c11, plug-in recess; 12a, conductive bottom plate; 12b, conductive row; b1, bending edge; p1, recessed hole; p2, convex hull; J, welding seam; t, limiting groove; 13, first insulating sleeve; 13a, pole hole; a1, protruding part ; 13b, snap-on portion; b2, snap-on slot; k1, first hole section; k2, second hole section; 13c, countersunk hole; 14, pressure relief structure; 20, shell; 30, electrode assembly; d, pole ear end; d1, first edge; 31, pole ear; 31a, welding section; 40, connecting plug; c2, second plug-in portion; c3, third plug-in portion; 41, first conductor portion; 42, second conductor portion; 43, third conductor portion; 44, second insulating sleeve; 44a, first part; 44b, second part; 44f, buckle; f1, notch; 44g, receiving groove; 50, insulating film. DETAILED DESCRIPTION

[0056] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0057] In the description of the present application, it should be understood that terms such as “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships, if any, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0058] In addition, if present, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In this application, unless otherwise clearly specified and limited, if any, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] In the present application, if it appears, unless otherwise clearly specified and limited, a first feature “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature “above”, “above” and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature “below”, “below” and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0061] It should be noted that, if present, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0062] In response to the problems mentioned in the background technology, the embodiments of the present application propose an end cover, a battery cell and a battery pack.

[0063] Figure 1 Schematic diagram of the structure of a battery cell 100 according to some embodiments.

[0064] like Figure 1 As shown, the battery cell 100 involved in the embodiment of the present application includes a shell 20 and an end cap 10 of the embodiment of the present application, and the end cap 10 and the shell 20 together form the internal space of the battery cell 100. The shell 20 forms the main accommodating space of the battery cell 100, and at least one end is open, and the end cap 10 covers the opening of the shell 20. Specifically, the end cap 10 can be arranged at the top opening and / or the bottom opening of the shell 20. The end cap 10 and the shell 20 can be made of high-strength metal materials such as aluminum, stainless steel, iron, etc., and of course other materials such as plastic can also be used.

[0065] Figure 2 for Figure 1 A partial structural schematic diagram of a battery cell 100 is shown.

[0066] like Figure 2As shown, an electrode assembly 30 is arranged in the internal space of the battery cell 100, and the electrode assembly 30 generally includes a positive electrode sheet, a negative electrode sheet, and an isolation film insulated between the positive electrode sheet and the negative electrode sheet. The electrode assembly 30 can be a winding structure or a stacked structure. All positive electrode sheets are formed with positive electrode ears 31, and all negative electrode sheets are formed with negative electrode ears 31. A pole 12 can be arranged on the end cover 10, and the pole ear 31 and the pole column 12 can be conductively connected directly or through an adapter, a current collecting plate, etc. The pole column 12 is used to connect the battery cell 100 to an external circuit to realize the charging and discharging of the battery cell 100.

[0067] The interior of the battery cell 100 is usually filled with an electrolyte, which is a carrier of ion transmission in the battery. It plays a role in conducting ions between the positive and negative electrodes, and has an important impact on the energy density, specific capacity, operating temperature range, cycle life, safety performance, etc. of the battery. Usually, an injection hole 11b is provided on the end cover 10, and the electrolyte can be injected into the interior of the battery cell 100 through the injection hole 11b. In addition, a pressure relief valve, a thinning notch, and other pressure relief structures 14 can also be provided on the end cover 10, which are used to open to relieve pressure when the internal pressure of the battery cell 100 is too high. In addition, an insulating film 50 can be wrapped around the outside of the electrode assembly 30 to reduce the risk of leakage of the shell 20.

[0068] The battery cell 100 may be cylindrical, rectangular or in other shapes. The specific structure of the battery cell 100 may be set with reference to conventional means and will not be described in detail herein.

[0069] The end cover 10 of the embodiment of the present application is described in detail below.

[0070] Figure 3 Schematic diagram of the structure of the end cover 10 of some embodiments. Figure 4 for Figure 3 A bottom view of the end cap 10 is shown.

[0071] Please refer to Figure 3 and Figure 4 The end cap 10 provided in the embodiment of the present application includes a cover body 11 and a pole 12. The cover body 11 has an inner side i and an outer side u disposed opposite to each other along the thickness direction X thereof. The inner side i of the cover body 11 is disposed facing the inside of the battery cell 100. The end cap 10 has a pole hole 13a connecting the inner side i of the cover body 11 and the outer side u of the cover body 11. The pole 12 is disposed in the pole hole 13a and includes a first plug-in portion c1 disposed toward the outer side u of the cover body 11. The first plug-in portion c1 is used to be plugged with the first external structure to electrically connect the first external structure and the pole 12.

[0072] When the end cap 10 is applied to the battery cell 100, the cover 11 and the shell 20 of the battery cell 100 enclose the internal space of the battery cell 100, and the inner side i is arranged facing the shell 20 (i.e., arranged facing the inside of the battery cell 100), and the outer side u is arranged facing away from the shell 20 (i.e., arranged away from the inside of the battery cell 100). The cover 11 can be made of plastic, metal, etc., for example, the cover 11 is an aluminum cover.

[0073] The end cap 10 has a pole hole 13a for installing the pole 12. The pole hole 13a connects the inner side i and the outer side u of the cover body 11. The pole 12 is installed at the hole structure 11a, and one end is located on the inner side i of the cover body 11, and can be electrically connected to the pole ear 31 of the electrode assembly 30 inside the battery cell 100, and the other end is located on the outer side u of the cover body 11, and can be connected to the external circuit to realize the charging and discharging of the battery cell 100.

[0074] The pole 12 can be directly or indirectly disposed on the cover 11. When the pole 12 is directly disposed on the cover 11, the pole hole 13a is formed on the cover 11. When the pole 12 is indirectly disposed on the cover 11 through an intermediate medium (such as the first insulating sleeve 13 hereinafter), the pole hole 13a is disposed on the intermediate medium, and a hole structure 11a can be disposed on the cover 11 for installing the intermediate medium.

[0075] One or two poles 12 may be provided on the cover 11. If only one pole 12 is provided on the cover 11, two end covers 10 are usually provided on the battery cell 100, wherein the pole 12 on one end cover 10 serves as a positive pole, and the pole 12 on the other end cover 10 serves as a negative pole. If two poles 12 are provided on the cover 11, one end cover 10 is usually provided on the battery cell 100, wherein one pole 12 on the end cover 10 serves as a positive pole, and the other pole 12 serves as a negative pole.

[0076] Generally, the size of the cover 11 in the thickness direction X is small, and the housing 20 is located on one side of the cover 11 in the thickness direction X. In this embodiment, the pole 12 includes a first plug-in portion c1, which is arranged toward the outer side u of the cover 11, and allows the first external structure to be plugged into the first plug-in portion c1 from the outer side u of the cover 11, and whether the first plug-in portion c1 protrudes from the cover 11 is not limited. The first external structure is a conductive structure for connecting the pole 12 to an external circuit, such as the connection plug 40 mentioned below or a bar that can be plugged into the first plug-in portion c1.

[0077] The first plug-in portion c1 is conductive, and when plugged into the first external structure, the pole 12 can be electrically connected to the first external structure, thereby achieving electrical connection between the pole ear 31 of the electrode assembly 30 and the first external structure.

[0078] The first direction Y, the second direction Z and the thickness direction X mentioned in this embodiment are not coplanar and intersect each other. Usually, the three directions are substantially perpendicular to each other. When the thickness direction X corresponds to the vertical direction, the first direction Y and the second direction Z can correspond to two perpendicular horizontal directions.

[0079] The first plug-in portion c1 may be plugged into the first external structure along the thickness direction X, or may be plugged into the first external structure along the first direction Y or the second direction Z, without limitation.

[0080] In actual application, when the battery pack 1000 is assembled using the end cap 10, the first plug-in portion c1 of the pole 12 on the end cap 10 is plugged into the first external structure to quickly achieve electrical connection between the first external structure and the pole 12. Compared with the prior art, in which the pole 12 needs to be connected to the external conductive structure by welding, the solution in the embodiment of the present application is more convenient to operate, saves time and effort, and can improve the production efficiency of the battery pack 1000.

[0081] Figure 5 Schematic diagram of the structure of the pole 12 in some embodiments.

[0082] In some embodiments, reference Figure 5 The first plug-in portion c1 includes a plug-in recess c11 for plugging with the first external structure along the thickness direction X.

[0083] The plug-in recess c11 may be a hole or groove drilled directly on the rectangular or cylindrical pole 12, or a hole or groove punched on the raw material of the pole 12. There are many specific ways to form the plug-in recess c11, which are not limited here.

[0084] At this time, the plugging recess c11 is used as the first plugging portion c1 to be plugged with the first external structure, which has a simple structure and can reduce the consumables used for the pole 12. The plugging recess c11 and the first external structure are plugged along the thickness direction X, and at least part of the depth of the plugging recess c11 can be arranged in the cover body 11, reducing the space occupied by the pole 12 in the thickness direction X, and also facilitating the assembly operation of the first plugging portion c1 and the first external structure.

[0085] Specifically in some embodiments, continue to refer to Figure 5 The pole 12 includes a conductive bottom plate 12a and a conductive row 12b. The conductive bottom plate 12a is located on the inner side i of the cover 11. The conductive row 12b is arranged on the conductive bottom plate 12a and penetrates the pole hole 13a. The two conductive rows 12b are spaced apart in a first direction Y compared to the thickness direction X, and together with the conductive bottom plate 12a, form a plug-in slot as the above-mentioned plug-in recess c11.

[0086] In one example, if Figure 3 and Figure 4 As shown, the cover body 11 is in a rectangular parallelepiped shape, the first direction Y may be the width direction of the cover body 11 , and two poles 12 may be arranged at intervals in the length direction of the cover body 11 .

[0087] The conductive bottom plate 12a and the conductive bar 12b are both conductive, and can be made of metal, but not limited to metal. When the pole 12 is a positive pole, the conductive bottom plate 12a and the conductive bar 12b can be made of aluminum. When the pole 12 is a negative pole, the conductive bottom plate 12a and the conductive bar 12b can be made of copper.

[0088] The conductive bottom plate 12a is disposed on the inner side of the cover 11 (combined with Figure 4 The first external structure is used to directly or indirectly electrically connect to the tab 31 of the electrode assembly 30. The two conductive bars 12b are arranged on the side of the conductive bottom plate 12a facing the outer side u of the cover body 11 and penetrate the cover body 11. The two are spaced apart in the first direction Y and form a plug-in slot together with the conductive bottom plate 12a. When the first external structure is plugged into the plug-in slot, it can be electrically connected to the two conductive bars 12b, and then electrically connected to the tab 31 through the conductive bottom plate 12a.

[0089] At this time, the pole 12 forms a plug-in recess c11 through the conductive bottom plate 12a and the two conductive bars 12b, which has a simple structure and is easy to implement.

[0090] Specifically, the two conductive bars 12 b may be symmetrically arranged relative to a symmetry plane perpendicular to the first direction Y.

[0091] In some embodiments, Figure 5 As shown, the conductive bar 12b and the conductive bottom plate 12a are integrally formed. In this way, one assembly process can be reduced, and the production efficiency of the end cover 10 can be improved. Specifically, the pole 12 with the conductive bar 12b and the conductive bottom plate 12a integrally formed can be prepared by 3D printing, mechanical processing, etc.

[0092] Figure 6 FIG. 4 is a cross-sectional view of a pole 12 according to some embodiments. Figure 7 for Figure 6 An exploded view of the pole 12 is shown.

[0093] In other embodiments, Figure 6 and Figure 7 As shown, one of the conductive bar 12 b and the conductive bottom plate 12 a is provided with a convex bump p2 , and the other is provided with a concave hole p1 . The convex bump p2 and the concave hole p1 are positioned and plugged in along the thickness direction X and are welded to each other.

[0094] In actual operation, the separately arranged conductive bar 12b and conductive bottom plate 12a are first positioned and plugged through the convex bump p2 and the concave hole p1, and then the conductive bar 12b and the conductive bottom plate 12a are welded at the matching position of the convex bump p2 and the concave hole p1 by laser welding or other methods.

[0095] Specifically, the concave hole p1 is provided on the conductive bottom plate 12a, and the convex bump p2 is provided on the conductive bar 12b. The convex bump p2 is inserted into and extends out of the concave hole p1 along the thickness direction X. Laser welding is performed at the portion where the convex bump p2 extends out of the concave hole p1 to weld the conductive bar 12b to the conductive bottom plate 12a. Specifically, the convex bump p2 and the concave hole p1 can be clearance-matched, and laser butt welding is performed at the gap between the two to form a weld J (such as Figure 6 shown).

[0096] At this time, the conductive bar 12b and the conductive bottom plate 12a can be processed independently, which simplifies the processing of the pole 12. Moreover, the welding accuracy of the conductive sheet and the conductive bottom plate 12a can be improved by the cooperation between the convex hull p2 and the concave hole p1, ensuring that the plug-in slot formed by the conductive bar 12b can be effectively plugged into the first external structure for electrical connection.

[0097] Figure 8 for Figure 3 An exploded view of the end cap 10 is shown.

[0098] In some embodiments, in combination Figure 3 and Figure 8 The end cover 10 further includes a first insulating sleeve 13 insulated between the cover body 11 and the pole 12. The first insulating sleeve 13 includes a pole hole 13a extending through the thickness direction X, and the pole 12 is installed in the pole hole 13a.

[0099] That is, the first insulating sleeve 13 is installed at the hole structure 11a of the cover body 11, the pole hole 13a is formed on the first insulating sleeve 13, and the pole 12 is installed on the pole hole 13a of the first insulating sleeve 13. The pole 12 is indirectly arranged on the cover body 11 through the first insulating sleeve 13.

[0100] The first insulating sleeve 13 is made of insulating material, which may be, but is not limited to, plastic. In order to improve the strength of the battery cell 100, the cover 11 is usually made of metal. In this case, the first insulating sleeve 13 is disposed between the cover 11 and the pole 12 to insulate the pole 12 from the cover 11, thereby reducing the risk of leakage of the metal cover 11.

[0101] In practical applications, the first insulating sleeve 13, the cover body 11 and the pole 12 can be integrally formed by an injection molding process.

[0102] Understandably, when the pole 12 is formed by the conductive row 12 b and the conductive bottom plate 12 a, the first insulating sleeve 13 can be sleeved on the periphery of the plug-in structure formed by the two conductive rows 12 b, while exposing the conductive bottom plate 12 a on the inner side i of the cover 11 .

[0103] Fig. 9 Schematic diagram of the structure of the first insulating sleeve 13 in some embodiments.

[0104] In some embodiments, reference Fig. 9 The first insulating sleeve 13 includes a clamping portion 13b, which is located outside the cover body 11 and is used to clamp the first external structure.

[0105] In actual application, the first external structure is provided with a clamping structure, and when the first external structure is plugged into the first plugging portion c1, the clamping structure is clamped with the clamping portion 13b, so that the plugging stability between the first external structure and the first plugging portion c1 can be improved.

[0106] Specifically in the embodiment, continue to refer to Fig. 9 The clamping portion 13b includes a clamping groove b2, which includes a first hole segment k1 and a second hole segment k2 that are adjacent and connected in the thickness direction X, the minimum hole diameter of the first hole segment k1 is smaller than the minimum hole diameter of the second hole segment k2, and the first hole segment k1 serves as a notch of the clamping groove b2, and is located on the side of the second hole segment k2 that is away from the inner side i of the cover body 11.

[0107] Specifically, Fig. 9 As shown, the slot b2 extends in a strip shape along the second direction Z, and the two ends of the slot b2 in the extending direction can be open or closed, which is not specifically limited. Fig. 9 As shown, both ends of the card slot b2 in its extending direction are usually open.

[0108] exist Fig. 9 In the illustrated embodiment, the minimum aperture of the first hole segment k1 is its aperture in the first direction Y, and the minimum aperture of the second hole segment k2 is its aperture in the first direction Y. The first aperture serves as the notch of the clamping slot b2, and when the first external structure is plugged into the first plug-in portion c1 along the thickness direction X, the clamping structure on the first external structure (such as the buckle 44f of the connecting plug 40 described below) can be inserted into the second hole segment k2 through the first hole segment k1 simultaneously, and is not easily separated from the clamping slot b2 under the restriction of the first hole segment k1, thereby achieving clamping fixation with the clamping portion 13b, and ensuring the stable connection between the first external structure and the end cover 10.

[0109] It is worth adding that in some examples, the clamping portion 13b is made of a flexible material, for example, the first insulating sleeve 13 is made of a plastic material as a whole. In this way, when the first external structure is plugged into the first plug-in portion c1 along the thickness direction X, the flexible clamping portion 13b can support the clamping structure on the first external structure to be inserted into the second hole segment k2 along the first hole segment k1 under the action of external force. In other examples, the clamping structure on the first external structure is an elastic structure, which can shrink when inserted into the first hole segment k1, expand when reaching the second hole segment k2, and finally be clamped in the clamping slot b2.

[0110] Further, refer to Fig. 9 The clamping portion 13b includes two clamping grooves b2, both of which extend in a strip shape along the second direction Z, and the two clamping grooves b2 are arranged at intervals on both sides of the pole hole 13a. At this time, the connection stress distribution between the first insulating seat and the first external structure is more uniform, and the plug-in connection between the first external structure and the first plug-in portion c1 is more secure.

[0111] Fig.10 FIG. 1 is a partial cross-sectional view of the end cap 10 according to some embodiments.

[0112] In some embodiments, combined with Figure 5 , Figure 6 and Fig.10 The pole 12 forms a limiting groove t which is open toward the hole wall of the pole hole 13a. The hole wall of the pole hole 13a protrudes toward the limiting groove t to form a protruding portion a1, and the protruding portion a1 is connected to the limiting groove t in a concave-convex matching manner.

[0113] The cross-sectional shape of the limiting groove t is roughly C-shaped, and its notch is roughly open toward the hole wall of the pole hole 13a along the direction perpendicular to the thickness direction X (such as the first direction Y and / or the second direction Z). When the pole 12 includes the conductive bar 12b mentioned above, the limiting groove t can be formed by processing the conductive bar 12b into a C shape. Alternatively, the conductive bar 12b is processed into an inverted L shape and forms a roughly C-shaped limiting groove t together with the conductive bottom plate 12a. The specific formation method of the limiting groove t can be flexibly set according to the construction method of the pole 12.

[0114] The limiting groove t may be continuously annular around the thickness direction X, which can be realized when the pole 12 is cylindrical. The limiting groove t may also be arranged symmetrically with respect to the axis of the pole hole 13a, which can be realized when the pole 12 includes the above-mentioned two conductive bars 12b.

[0115] At this time, the pole 12 forms a concave-convex fitting assembly posture with the pole hole 13 a through the limiting groove t, and the installation reliability of the pole 12 in the pole hole 13 a is higher.

[0116] Further to the embodiment, combined with Fig. 9 and Fig.10 It is understood that the end of the pole hole 13a facing away from the inner side i of the cover body 11 is concave to form a countersunk hole 13c, the protrusion a1 is protruding relative to the inner wall of the countersunk hole 13c, and the pole 12 has a bent edge b1 bent toward the hole wall of the countersunk hole 13c, and the bent edge b1 forms a groove side wall of the limiting groove t in the thickness direction X that abuts against the protrusion a1.

[0117] It can be understood that the countersunk hole 13c is recessed along the above-mentioned thickness direction X, and is located at one end of the inner side i of the pole hole 13a away from the cover body 11. The bent edge b1 is accommodated within the range of the countersunk hole 13c. The bent edge b1 participates in forming the limiting groove t and abuts against the protrusion a1 in the thickness direction X. The surface abutting against the protrusion a1 serves as the groove side wall of the limiting groove t.

[0118] Specifically, when the pole 12 includes the conductive bar 12 b , the bending edge b1 is formed at one end of the conductive bar 12 b away from the inner side i of the cover 11 , and the bending edge b1 of each conductive bar 12 b is bent in opposite directions along the first direction Y.

[0119] At this time, the bent edge b1 on the pole 12 that participates in forming the limiting groove t is accommodated in the countersunk hole 13c without protruding from the pole hole 13a, which can reduce the space occupied by the end cover 10 in the thickness direction X, and further reduce the space occupied by the battery cell 100 in the above-mentioned thickness direction X, which helps to improve the space utilization of the battery pack 1000.

[0120] The battery cell 100 according to the embodiment of the present application is described in detail below.

[0121] Fig.11 Schematic diagram of the cooperation between the connecting plug 40 and the end cover 10 in the battery cell 100 in some embodiments.

[0122] Reference Figure 1 and Figure 2 , and combined with Fig.11 The battery cell 100 provided in the embodiment of the present application includes the end cover 10, the shell 20, the electrode assembly 30 and the connecting plug 40 of any of the above embodiments. The shell 20 is assembled on the inner side i of the cover body 11, and together with the cover body 11 forms a receiving cavity. The electrode assembly 30 is located in the receiving cavity, and includes a pole ear 31 conductively connected to the pole 12. The connecting plug 40 is arranged on the outer side u of the cover body 11, and includes a second plug-in portion c2 and a third plug-in portion c3 conductively connected. The second plug-in portion c2 is plugged into the first plug-in portion c1, and the third plug-in portion c3 is used to be plugged into the second external structure to electrically connect the second external structure and the pole 12.

[0123] The connecting plug 40 is a first external structure, and is used to be plugged into the first plugging portion c1 on the end cover 10. The second plugging portion c2 is plugged into the first plugging portion c1 electrically connected. If the first plugging portion c1 includes the plugging recess c11 mentioned above, the second plugging portion c2 has a plugging protrusion plugged into the plugging recess c11.

[0124] The third plug-in portion c3 is used for plugging with the second external structure. Specifically, the second external structure may be, but is not limited to, the wiring harness plate 300 mentioned below. Please refer to the following for the description of the wiring harness plate 300. Please refer to the above for the description of the electrode assembly 30.

[0125] The connection plug 40 and the first plug part c1 can be detachably plugged. The conductively connected second plug part c2 and the third plug part c3 on the connection plug 40 are used as a plug group. One or more plug groups can be provided on the connection plug 40. The second plug part c2 of each plug group is used to independently plug with the first plug part c1 of a pole 12. That is, the first plug part c1 of each pole 12 can be independently plugged with a connection plug 40, and the first plug parts c1 of multiple poles 12 can be simultaneously plugged with a connection plug 40.

[0126] The battery cell 100 has a plug-in connection between its pole 12 and the connection plug 40, and the assembly efficiency of the battery cell 100 is high. Moreover, when assembled into a battery pack 1000, each battery cell 100 can be electrically connected to the wiring harness plate 300 of the battery pack 1000 through the connection plug 40 thereon, which can improve the packing efficiency of the battery pack 1000.

[0127] The battery cell 100 has all the beneficial effects of the above-mentioned embodiments.

[0128] It can be understood that, in a normal use state of the battery cell 100 , the thickness direction X of the cover 11 corresponds to the height direction of the battery cell 100 .

[0129] Fig.12 Schematic diagram of the appearance of the connecting plug 40 in some embodiments. Fig.13 for Fig.12 A cross-sectional view of the connecting plug 40 is shown.

[0130] In some embodiments, reference Fig.12 and Fig.13 The connecting plug 40 includes a second insulating sleeve 44, and the second plug-in portion c2 and the third plug-in portion c3 are partially disposed inside the second insulating sleeve 44 and are conductively connected, and the remaining portions extend out of the second insulating sleeve 44. The remaining portion of the second plug-in portion c2 extends toward the cover body 11, and the remaining portion of the third plug-in portion c3 extends away from the cover body 11.

[0131] The second insulating sleeve 44 has an insulating effect and can be made of, but is not limited to, plastic material. Optionally, the second plug-in portion c2 and the third plug-in portion c3 are embedded in the second insulating sleeve 44 by injection molding.

[0132] Understandably, the second plug-in portion c2 and the third plug-in portion c3 are conductive. Parts of the second plug-in portion c2 and the third plug-in portion c3 are embedded in the second insulating sleeve 44, and the remaining parts of the second plug-in portion c2 and the third plug-in portion c3 extend out of the second insulating sleeve 44 to facilitate plugging with other structures. The provision of the second insulating sleeve 44 can facilitate the staff to plug the connection plug 40 into the first plug-in portion c1 and the second external structure, and can also play a protective role to prevent the connection plug 40 from leaking electricity.

[0133] In addition, the second plug-in portion c2 and the third plug-in portion c3 extend in opposite directions in the thickness direction X. The second plug-in portion c2 can be plugged into the first plug-in portion c1 along the thickness direction X, and the third plug-in portion c3 can be plugged into the second external structure along the thickness direction X. During the assembly of the battery cell 100 and the packaging of the battery pack 1000, the preparation process can be simplified and the operation can be easier.

[0134] Fig.14 for Fig.12 A partial structural schematic diagram of the connecting plug 40 is shown.

[0135] Specifically, Fig.14 As shown, the connecting plug 40 includes a first conductor part 41, a second conductor part 42 and a third conductor part 43. The first conductor part 41 is partially arranged inside the second insulating sleeve 44 as the second plug-in part c2, and the remaining part extends out of the second insulating sleeve 44 and extends toward the cover body 11, and is used to be plugged with the first plug-in part c1. The second conductor part 42 is partially arranged inside the second insulating sleeve 44 as the third plug-in part c3, and the remaining part extends out of the second insulating sleeve 44 and extends away from the cover body 11, and is used to be plugged with the second external structure. The third conductor part 43 is arranged in the second insulating sleeve 44, and conductively connects the first conductor part 41 and the second conductor part 42.

[0136] Specifically, Fig.14 As shown, the first conductor part 41 is a metal bar, the second conductor part 42 is a wire harness group, and the third conductor part 43 includes a metal bar and a wire harness group. The wire harness group of the second conductor part 42 is fixed by the metal bar of the third conductor part 43, and then electrically connected to the metal bar of the first conductor part 41 through the wire harness group of the third conductor part 43.

[0137] The conductive connection method of the second plug-in portion c2 and the third plug-in portion c3 is not limited to the above solution, and those skilled in the art can make flexible settings.

[0138] In some embodiments, in combination Fig.11 and Fig.13 It is understood that the second insulating sleeve 44 includes a buckle 44f, and the buckle 44f and the remaining part of the second plug-in portion c2 are both located at one end of the second insulating sleeve 44 facing the cover body 11. The end cover 10 includes a first insulating sleeve 13 insulatedly arranged between the pole 12 and the cover body 11, and the first insulating sleeve 13 includes a clamping portion 13b located outside the cover body 11, and the buckle 44f is clamped with the clamping portion 13b.

[0139] Specifically, when the engaging portion 13b includes the engaging groove b2 mentioned above, when the second inserting portion c2 is inserted into the first inserting portion c1 along the thickness direction X, the buckle 44f can be simultaneously engaged with the engaging groove b2.

[0140] In order to save effort when the buckle 44f is inserted into the slot b2, the buckle 44f can be elastic (for example, the second insulating sleeve 44 is made of plastic material, which is relatively soft). In this way, the buckle 44f can be deformed under external force to break through the limitation of the first hole section k1 of the slot b2 and extend into the second hole section k2.

[0141] Furthermore, if Fig.13 As shown, a notch f1 can be processed on the buckle 44f, and the notch f1 can provide more deformation space for the buckle 44f, making it easier for the buckle 44f to be smoothly inserted into the slot b2.

[0142] At this time, the connection plug 40 is engaged with the engaging portion 13 b on the first insulating sleeve 13 through the buckle 44 f, so that the connection between the connection plug 40 and the end cover 10 is more stable, and the electrical connection between the connection plug 40 and the pole 12 is more reliable.

[0143] In some embodiments, reference Fig.13 , and combined with Fig.11 It is understood that a receiving groove 44g is provided at one end of the second insulating sleeve 44 facing the cover body 11 , the buckle 44f is located in the receiving groove 44g , the second plug-in portion c2 passes through the receiving groove 44g , and the receiving groove 44g covers the first insulating sleeve 13 .

[0144] At this time, the end of the first insulating sleeve 13 facing away from the inner side i of the cover body 11 is received in the receiving groove 44g, so that after the connecting plug 40 is inserted into the end cover 10, the battery cell 100 as a whole occupies a smaller space in the thickness direction X, which helps to improve the space utilization of the battery pack 1000.

[0145] In one embodiment, in combination Fig.13 and Fig.14It is understood that the second insulating sleeve 44 includes a first part 44a and a second part 44b, wherein the first part 44a is formed with a matching groove toward the cover body 11, and the second part 44b is assembled in the matching groove. The second conductor part 42 and the third conductor part 43 are arranged in the first part 44a, and a part of the first conductor part 41 is located in the first part 44a and connected to the second conductor part 42 via the third conductor part 43, and the other part passes through the second part 44b and extends toward the cover body 11. The card slot b2 and the receiving slot 44g are both located in the second part 44b.

[0146] That is, the second insulating sleeve 44 is formed by assembling a first part 44 a and a second part 44 b which are separately provided. The processing of the second insulating sleeve 44 is simpler, and the production process of the connecting plug 40 can be simplified.

[0147] Fig.15 Schematic diagram of the electrode assembly 30 and the end cover 10 after being welded in some embodiments. Fig.16 for Fig.15 A side view of the structure shown. Fig.17 for Fig.15 Another side view of the structure shown.

[0148] In some embodiments, in combination Figures 15 to 17 It is understood that the electrode assembly 30 has a pole ear end d facing the cover body 11, the pole ear 31 is arranged at the pole ear end d, and has a bendable welding section 31a with a first edge d1 relative to the pole ear end d. Two electrode assemblies 30 are arranged side by side along the first direction Y intersecting the thickness direction X to form an electrode group, and two welding sections 31a with the same polarity in the same electrode group are respectively welded to two adjacent parts of the same pole 12 in the first direction Y. In the same electrode group, the two first edges d1 are arranged at the two adjacent ends of the two electrode assemblies 30 in the first direction Y, and each welding section 31a is folded in two layers and arranged between the corresponding electrode assembly 30 and the cover body 11; or, in the same electrode group, the two first edges d1 are arranged at the two opposite ends of the two electrode assemblies 30 in the first direction Y, and each welding section 31a is arranged in a layer between the corresponding electrode assembly 30 and the cover body 11.

[0149] In practical application, combined with Fig.15 It is understood that the two electrode assemblies 30 are used as an electrode group, and the pole ears 31 with the same polarity in the electrode group are welded to the same pole 12 (when the pole 12 includes the above-mentioned conductive bottom plate 12a, the pole ears 31 are welded to the conductive bottom plate 12a). The assembly process of the electrode assembly 30 and the pole 12 is roughly as follows:

[0150] First, place the electrode assembly 30 in a flat position (such as Fig.15As shown in the state, taking the example that both the electrode assembly 30 and the end cover 10 are square-shaped, in the lying state, the pole ear ends d of the two electrode assemblies 30 are located on opposite sides of the end cover 10 in the first direction Y (i.e., the width direction of the end cover 10) and are arranged opposite to each other, and the first edges d1 of the two electrode assemblies 30 are arranged opposite to the cover body 11 in the first direction Y.

[0151] Then, the welding sections 31a of the two pole ears 31 of the same polarity of the two electrode assemblies 30 are pulled to the same pole 12 and respectively welded to two adjacent parts of the pole 12 in the first direction Y. This process is called horizontal welding.

[0152] Finally, the two electrode assemblies 30 are turned over toward the inner side i of the cover body 11. Fig.16 and Fig.17 As shown, it is understandable that after the electrode assembly 30 is turned over, its tab end d is located on the inner side i of the cover body 11 and is arranged opposite to the cover body 11 in the thickness direction X thereof.

[0153] Thus, after the electrode assembly 30 is turned over, the welding section 31a has two states. Fig.17 It is understood that the welding section 31a is folded in two layers and arranged between the pole ear end d and the cover 11, and the first edges d1 of the two electrode assemblies 30 are located at the two ends adjacent to each other in the first direction Y after the two are flipped. Fig.16 It is understood that the welding section 31a is disposed in a layer between the pole ear end d and the cover body 11, and the first edges d1 of the two electrode assemblies 30 are located at two ends opposite to each other in the first direction Y after the two electrode assemblies 30 are flipped.

[0154] The main reason for the two situations is that the electrode assembly 30 is in a different posture when lying flat. Fig.16 In the flipping process, the electrode assembly 30 is flipped around the first edge d1 of the electrode ear end d, and the flipped first edge d1 is roughly aligned with the edge of the end cover 10. The welding section 31a is arranged in a layer between the electrode assembly 30 and the cover body 11. Fig.17 In the state shown in the figure, during the flipping process, the electrode assembly 30 roughly flips around the end of the pole ear end d away from the first edge d1, and the flipped first edge d1 moves to the middle area of ​​the end cover 10, and the welding section 31a is arranged in two layers between the electrode assembly 30 and the cover body 11.

[0155] At this time, the electrode assembly 30 is laid flat to weld the electrode ear 31 of the electrode assembly 30 to the electrode column 12, which makes the welding operation easier. Fig.16When the electrode assembly 30 is in a forward lying position, the welding section 31a of the electrode tab 31 is arranged in only one layer after the electrode assembly 30 is turned over, which can reduce the space occupied by the battery cell 100 in the thickness direction X of the cover body 11. Fig.17 In the reverse lying posture shown, after the electrode assembly 30 is turned over, the welding section 31a of the pole ear 31 is folded into two layers, and the current flow area of ​​the pole ear 31 is larger.

[0156] The battery pack 1000 in the embodiment of the present application is introduced below.

[0157] Fig.18 FIG. 1 is an exploded schematic diagram of a battery pack 1000 in some embodiments. Fig.18 The battery pack 1000 provided in the embodiment of the present application includes a box body 200, a battery cell 100 as in any of the above embodiments, and a wiring harness plate 300. A plurality of battery cells 100 are accommodated in the box body 200, and the wiring harness plate 300 is arranged on the same side of the plurality of battery cells 100 and arranged opposite to the connection plug 40. The wiring harness plate 300 includes a plurality of docking terminals 301, each docking terminal 301 being electrically connected to the third plug-in portion c3 by plugging.

[0158] The wiring harness plate 300 can be used as a box cover, and together with the box body 200, it forms a space for accommodating the battery cell 100. The box body 200 can also independently form the internal space of the battery pack 1000, which is used to accommodate the wiring harness plate 300 and the battery cell 100 at the same time. The wiring harness plate 300 is used to integrate the high and low voltage wiring harnesses, signal collectors, etc. in the battery pack 1000. It is connected to the third plug-in part c3 through the docking terminal 301, and then the current, voltage, temperature and other information of the battery cell 100 are obtained. Regarding the working principle of the wiring harness plate 300, reference can be made to conventional designs.

[0159] Usually, the same harness plate 300 is plugged into the third plug-in parts c3 of multiple battery cells 100 through the docking terminal 301. One or more harness plates 300 may be provided in the battery pack 1000. One docking terminal 301 may be plugged into one third plug-in part c3, or one docking terminal 301 may be plugged into multiple third plug-in parts c3, which can be set flexibly.

[0160] When assembling the battery pack 1000 in the embodiment of the present application, the docking terminal 301 of the wiring harness board 300 is directly connected with the third plug-in part c3 on the battery cell 100, and then loaded into the box body 200. This not only realizes the signal collection of the battery cell 100 by the wiring harness board 300, but also is convenient to operate. The assembly efficiency of the battery pack 1000 is high, which can greatly improve the packaging efficiency of the battery pack 1000.

[0161] Of course, the battery pack 1000 also has all the beneficial effects in the above embodiments.

[0162] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0163] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An end cap (10) for a battery cell (100), characterized in that: The end cover (10) comprises: A cover body (11) having an inner side (i) and an outer side (u) disposed opposite to each other along a thickness direction (X) thereof, wherein the inner side (i) of the cover body (11) is disposed facing the interior of the battery cell (100), and the end cover (10) has a pole hole (13a) connecting the inner side (i) of the cover body (11) and the outer side (u) of the cover body (11); and A pole (12) is arranged in the pole hole (13a), and comprises a first plug-in portion (c1) arranged toward the outer side (u) of the cover body (11), wherein the first plug-in portion (c1) is used to be plugged into a first external structure to electrically connect the first external structure and the pole (12).

2. The end cap (10) according to claim 1, characterized in that: The first plug-in portion (c1) includes a plug-in recess (c11) for plugging into the first external structure along the thickness direction (X).

3. The end cap (10) according to claim 2, characterized in that: The pole (12) comprises a conductive bottom plate (12a) and a conductive row (12b), wherein the conductive bottom plate (12a) is located on the inner side (i) of the cover body (11), and the conductive row (12b) is arranged on the conductive bottom plate (12a) and penetrates the pole hole (13a); The two conductive rows (12b) are spaced apart in a first direction (Y) intersecting the thickness direction (X), and together with the conductive bottom plate (12a) form a plug-in slot serving as the plug-in recess (c11).

4. The end cap (10) according to claim 3, characterized in that: The conductive bar (12b) and the conductive base plate (12a) are integrally formed; or, one of the conductive bar (12b) and the conductive base plate (12a) is provided with a convex bump (p2), and the other is provided with a concave hole (p1), and the convex bump (p2) and the concave hole (p1) are positioned and plugged in along the thickness direction (X) and are welded to each other.

5. The end cap (10) according to claim 1, characterized in that: The end cover (10) further comprises a first insulating sleeve (13) insulatedly arranged between the cover body (11) and the pole (12); the pole hole (13a) is arranged in the first insulating sleeve (13) and is penetrated along the thickness direction (X); The first insulating sleeve (13) comprises a clamping portion (13b), wherein the clamping portion (13b) is located on the outer side (u) of the cover body (11) and is used for clamping the first external structure.

6. The end cap (10) according to claim 5, characterized in that: The clamping portion (13b) includes a clamping groove (b2), and the clamping groove (b2) includes a first hole segment (k1) and a second hole segment (k2) that are adjacent and connected in the thickness direction (X), the minimum hole diameter of the first hole segment (k1) is smaller than the minimum hole diameter of the second hole segment (k2), and the first hole segment (k1) serves as a notch of the clamping groove (b2) and is located on a side of the second hole segment (k2) that is away from the inner side (i) of the cover body (11).

7. The end cap (10) according to any one of claims 1 to 6, characterized in that: The pole (12) forms a limiting groove (t) open toward the hole wall of the pole hole (13a), and the hole wall of the pole hole (13a) protrudes toward the limiting groove (t) to form a protrusion (a1), and the protrusion (a1) is connected to the limiting groove (t) in a concave-convex matching manner.

8. The end cap (10) according to claim 7, characterized in that: One end of the pole hole (13a) facing away from the inner side (i) of the cover body (11) is concave to form a countersunk hole (13c), the protruding portion (a1) is protruding relative to the hole wall of the countersunk hole (13c), and the pole (12) has a bent edge (b1) bent toward the hole wall of the countersunk hole (13c), and the bent edge (b1) forms a groove side wall of the limiting groove (t) in the thickness direction (X) that abuts against the protruding portion (a1).

9. A battery cell (100), characterized in that: include: The end cap (10) according to any one of claims 1 to 8; A housing (20) is mounted on the inner side (i) of the cover body (11) and forms a receiving cavity together with the cover body (11); An electrode assembly (30), located in the accommodating cavity, comprising a pole ear (31) electrically connected to the pole (12); and A connecting plug (40) is arranged on the outer side (u) of the cover body (11), and comprises a second plug-in portion (c2) and a third plug-in portion (c3) which are conductively connected, wherein the second plug-in portion (c2) is plugged into the first plug-in portion (c1), and the third plug-in portion (c3) is used to be plugged into a second external structure to electrically connect the second external structure and the pole (12).

10. The battery cell (100) according to claim 9, characterized in that: The connecting plug (40) comprises a second insulating sleeve (44); the second plug-in portion (c2) and the third plug-in portion (c3) are both partially disposed inside the second insulating sleeve (44) and are conductively connected, and the remaining portions extend out of the second insulating sleeve (44); the remaining portion of the second plug-in portion (c2) extends toward the cover body (11), and the remaining portion of the third plug-in portion (c3) extends away from the cover body (11).

11. The battery cell (100) according to claim 10, characterized in that: The second insulating sleeve (44) comprises a buckle (44f), and the buckle (44f) and the remaining part of the second plug-in portion (c2) are both located at one end of the second insulating sleeve (44) facing the cover body (11); The end cover (10) comprises a first insulating sleeve (13) insulatedly arranged between the pole (12) and the cover body (11), the first insulating sleeve (13) comprising a clamping portion (13b) located on the outer side (u) of the cover body (11), and the buckle (44f) is clamped with the clamping portion (13b).

12. The battery cell (100) according to claim 11, characterized in that: A receiving groove (44g) is provided at one end of the second insulating sleeve (44) facing the cover body (11), the buckle (44f) is located in the receiving groove (44g), the second plug-in portion (c2) passes through the receiving groove (44g), and the receiving groove (44g) covers the first insulating sleeve (13).

13. The battery cell (100) according to claim 9, characterized in that: The electrode assembly (30) has a pole ear end (d) arranged facing the cover body (11), the pole ear (31) is arranged at the pole ear end (d), and has a welding section (31a) that can be bent relative to a first edge (d1) of the pole ear end (d); The two electrode assemblies (30) are arranged side by side along a first direction (Y) intersecting the thickness direction (X) to form an electrode group, and the two welding segments (31a) with the same polarity in the same electrode group are respectively welded to two adjacent parts of the same pole (12) in the first direction (Y); In the same electrode group, the two first edges (d1) are arranged at two adjacent ends of the two electrode assemblies (30) in the first direction (Y), and each welding section (31a) is folded in half and arranged in two layers between the corresponding electrode assembly (30) and the cover body (11); or, in the same electrode group, the two first edges (d1) are arranged at two opposite ends of the two electrode assemblies (30) in the first direction (Y), and each welding section (31a) is arranged in one layer between the corresponding electrode assembly (30) and the cover body (11).

14. A battery pack (1000), characterized in that: include: Box (200); The battery cell (100) according to any one of claims 9 to 13, wherein a plurality of the battery cells (100) are accommodated in the box (200); and The wiring harness plate (300) is arranged on the same side of the plurality of battery cells (100) and is arranged opposite to the connection plug (40); the wiring harness plate (300) comprises a plurality of docking terminals (301), each of the docking terminals (301) being electrically connected to the third plug-in portion (c3).

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