Battery monomer and battery

Abstract

The utility model provides a single battery and a battery, and relates to the technical field of lithium ion batteries. According to the single battery, at least two plug-in units are arranged on one side, facing a battery cell, of a cover plate assembly, grooves are formed in the peripheral walls of the plug-in units, through holes corresponding to the plug-in units are formed in an insulating sheet, and the hole walls of the through holes are connected with convex teeth; after the plug-in unit penetrates through the through hole, at least part of the protruding teeth is located in the groove, the protruding teeth make contact with the plug-in unit, then in the assembling process, the protruding teeth of the through hole can make contact with the plug-in unit and deform due to stress, after assembling is completed, the protruding teeth can be clamped in the groove of the plug-in unit and make contact with the plug-in unit, and therefore the cover plate assembly and the insulation sheet are fixed. The insulation sheet and the cover plate assembly are difficult to fall off in the vertical direction and are not easy to deviate in the horizontal direction, the insulation sheet is not easy to deviate and move, other undesirable phenomena such as welding explosion points or interference of entering of a roll core into a shell and the like are avoided, and the superior rate of a single battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium ion batteries, in particular to a battery monomer and a battery. BACKGROUND

[0002] In the field of batteries, the battery monomer includes a battery cell, a shell and a cover plate assembly, the cover plate assembly includes a cover plate and a lower plastic part, the cover plate covers the opening of the shell, the cover plate and the shell are connected into an outer shell, the battery cell and the lower plastic part are both accommodated in the outer shell, and the lower plastic part is connected to the side of the cover plate facing the battery cell; wherein when the battery cell is accommodated in the outer shell, in order to ensure that the battery cell and the outer shell are insulated, a layer of insulating film is generally wrapped around the outside of the battery cell, and the existing insulating film wrapping method can be wrapping from the bottom of the battery cell towards the cover plate, or wrapping from the cover plate towards the bottom of the battery cell.

[0003] An existing insulating film wrapping from the cover plate towards the bottom of the battery cell includes a top film piece, since the top film piece is only placed on the side of the lower plastic part facing the battery cell, and has no fixed relationship with the lower plastic part or the pole, therefore, in the battery manufacturing process, if the top film piece of the insulating film moves (see Figure 13 ), it will affect the welding of the pole and the adapter piece, resulting in welding explosion points, or it will affect the subsequent battery cell into the shell. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to provide a battery monomer and a battery to solve the technical problem that the insulating piece in the battery monomer of the prior art is prone to deviation.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0006] In a first aspect, the present application provides a battery monomer, comprising: a battery cell, a cover plate assembly and an insulating piece, the side of the cover plate assembly facing the battery cell is provided with at least one insert, the outer peripheral wall of the insert is provided with a groove; the insulating piece is at least partially arranged between the cover plate assembly and the battery cell, the insulating piece is provided with a through hole corresponding to the insert, the hole wall of the through hole is connected with a protruding tooth, the insert penetrates through the through hole, at least part of the protruding tooth is located in the groove, and the protruding tooth and the insert are in contact.

[0007] In one or more embodiments of the present application, the groove includes a plurality of grooves, and the plurality of grooves are distributed along the circumference of the insert;

[0008] The protruding tooth includes a plurality of protruding teeth, and the plurality of protruding teeth are arranged along the circumferential direction of the hole wall of the through hole, the protruding tooth and the groove have a one-to-one correspondence relationship, and the protruding tooth is accommodated in the corresponding groove.

[0009] In one or more embodiments of the present application, the groove has a ring structure around the circumference of the insert, the protruding tooth includes a plurality of protruding teeth, the plurality of protruding teeth are arranged along the circumferential direction of the hole wall of the through hole, and all the protruding teeth are accommodated in the groove.

[0010] In one or more embodiments of the present application, the plurality of protrusions are evenly arranged along the circumferential direction of the hole wall of the through hole.

[0011] In one or more embodiments of the present application, the protrusion comprises a connecting end connected with the insulating sheet and a free end arranged away from the connecting end; along the circumferential direction of the through hole, the width of the connecting end is greater than the width of the free end.

[0012] In one or more embodiments of the present application, the hole wall of the through hole is in contact with the insert.

[0013] In one or more embodiments of the present application, four through holes are provided, and the four through holes are divided into two groups arranged opposite to each other along a first direction, and each group of through holes comprises two through holes arranged opposite to each other along a second direction, and the first direction and the second direction are perpendicular to each other.

[0014] In one or more embodiments of the present application, the protrusion and the insulating sheet are of an integrated structure.

[0015] In one or more embodiments of the present application, the insert comprises a head, and a side of the head away from the cover plate assembly is a tapered surface.

[0016] In a second aspect, the present application also provides a battery comprising the battery cell of any one of the first aspect.

[0017] Based on the above technical solution, the battery cell and the battery provided by the present application at least have the following beneficial technical effects:

[0018] The battery cell provided by the present application comprises at least one insert arranged on the side of the cover plate assembly facing the battery cell, the outer peripheral wall of the insert is provided with a groove, the insulating sheet is provided with a through hole corresponding to the insert, the hole wall of the through hole is connected with a protrusion, in the process of assembling the insulating sheet and the cover plate assembly, the insert penetrates through the through hole, the protrusion of the through hole is deformed under the force of the insert, when the insulating sheet and the cover plate assembly are assembled in place, the protrusion of the through hole resets and extends into the groove of the insert, and the protrusion of the through hole is in contact with the insert, so that the cover plate assembly and the insulating sheet are fixed, that is, the insulating sheet and the cover plate assembly cannot be easily separated along the axial direction of the through hole, and the insulating sheet and the cover plate assembly cannot move relative to each other along the direction perpendicular to the axis of the through hole, thereby avoiding welding explosion points or interfering with the winding of the core into the shell and other adverse phenomena, and the yield of the battery cell is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a schematic diagram of the fixing structure of the cover plate assembly and the insulation sheet provided by the present application.

[0021] Figure 2 is a schematic diagram of the structure of the insulation plate in the cover plate assembly provided by the present application.

[0022] Figure 3 is a schematic diagram of the structure of the insulation plate in the cover plate assembly provided by the present application.

[0023] Figure 4 is a schematic diagram of the unfolded structure of the insulation sheet provided by the present application.

[0024] Figure 5 is a longitudinal sectional view of the cover plate assembly provided by the present application.

[0025] Figure 6 is a schematic diagram of the structure of the through hole in the insulation sheet provided by an embodiment of the present application.

[0026] Figure 7 is a schematic diagram of the structure of the through hole in the insulation sheet provided by another embodiment of the present application.

[0027] Figure 8 is a schematic diagram of the structure of the through hole in the insulation sheet provided by yet another embodiment of the present application.

[0028] Figure 9 is a schematic diagram of the structure of the through hole in the insulation sheet provided by yet another embodiment of the present application.

[0029] Figure 10 is a schematic diagram of the different deformation states of the protruding teeth in the through hole at different assembly stages provided by the present application.

[0030] Figure 11 is a schematic diagram of the states of the protruding teeth before and after assembly provided by the present application.

[0031] Figure 12 is a schematic diagram of the structure of the four through holes on the insulation sheet provided by an embodiment of the present application.

[0032] Figure 13 is a schematic diagram of the structure when the existing insulation film and end cover assembly are offset.

[0033] In the figure: 1-cover plate assembly; 2-insulation sheet; 3-adapter sheet; 10-insulation plate; 11-cover plate; 101-insert; 102-clearance hole; 111-pole; 21-first base sheet; 22-second base sheet; 23- support plate; 211-through hole; 1011-head; 1012-groove; 1013-root; 2110-protruding teeth; 2111-connection end; 2112-free end. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] In addition, the terms "first", "second", "third", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0038] In the battery manufacturing process, after the battery cell is hot-pressed, an insulating sheet is often attached to the surface of the battery cell, and is fixed by a rubber band. The purpose is to protect the battery cell from scratches and prevent some welding slag from falling into the battery cell. In the related art, the insulating sheet only has a positioning function with the insulating plate of the cover plate assembly and is not fixed on the insulating plate. During assembly, if the relative position of the insulating sheet and the cover plate assembly is offset (see Figure 13 ), it is easy to cause welding explosion when welding the pole and the adapter sheet, or to interfere with the battery cell into the shell in the subsequent process, affecting the quality of the battery.

[0039] Based on the above considerations, in order to solve the technical problem that the insulating sheet in the battery cell of the prior art is prone to offset. The present application provides a battery cell, comprising: a battery cell, a cover plate assembly and an insulating sheet, the side of the cover plate assembly facing the battery cell is provided with at least two inserts, the outer peripheral wall of the insert is provided with a groove; the insulating sheet is at least partially arranged between the cover plate assembly and the battery cell, the insulating sheet is provided with a through hole corresponding to the insert, the hole wall of the through hole is connected with a protrusion, the insert penetrates through the through hole, at least part of the protrusion is located in the groove, and the protrusion and the insert are in contact.

[0040] In the technical scheme of the embodiment of the present application, during the assembly of the insulating sheet and the cover plate assembly along the axial direction of the through hole, the protrusions of the through hole are forced to be deformed by the head of the plug far away from the cover plate assembly (see Figure 10 and Figure 11 ) when first contacted. The insulating sheet is continuously moved in the direction close to the cover plate assembly until the protrusions of the through hole contact the groove, that is, the protrusions of the through hole are restored to the elasticity and extend into the groove because the force of the head of the plug is no longer applied, and the protrusions of the through hole contact the groove wall, so that the cover plate assembly and the insulating sheet are fixed, that is, the insulating sheet and the cover plate assembly cannot be easily separated along the axial direction of the through hole, and the insulating sheet and the cover plate assembly cannot be relatively moved along the direction perpendicular to the axial direction of the through hole, thereby avoiding welding explosion points or other adverse phenomena such as interference of the winding core into the shell, and improving the yield of the battery monomer.

[0041] The battery monomer provided by the present application can be applied to various battery-using electric devices, which can be but are not limited to mobile phones, tablets, notebook computers, electric toys, electric tools, electric vehicles, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0042] The technical scheme of the embodiment of the present application will be described in detail below in conjunction with the drawings of the specification.

[0043] Please refer to Figures 1 to 5 , the embodiment of the present application provides a battery monomer, which comprises: an electric core, a cover plate assembly 1 and an insulating sheet 2, the side of the cover plate assembly 1 facing the electric core is provided with at least one plug 101, the outer peripheral wall of the plug 101 is provided with a groove 1012; the insulating sheet 2 is at least partially arranged between the cover plate assembly 1 and the electric core, the insulating sheet 2 is provided with a through hole 211 corresponding to the plug 101, the hole wall of the through hole 211 is connected with a protrusion 2110, the plug 101 penetrates through the through hole 211, at least part of the protrusion 2110 is located in the groove 1012, and the protrusion 2110 and the plug 101 are in contact.

[0044] Among them, the plug 101 can be a protruding structure protruding from the side of the cover plate assembly 1 facing the electric core, and the plug 101 can be provided with one or two or three or four or five. The groove 1012 can be a groove structure recessed from the outer peripheral wall of the plug 101 to the inside thereof. The through hole 211 can be a hole penetrating through the thickness direction of the insulating sheet 2. The protrusion 2110 can be a structure member with one end connected to the hole wall of the through hole 211 and the other end freely extending towards the center direction of the through hole 211. The protrusion 2110 and the plug 101 can be in contact in a straight state, or the protrusion 2110 and the plug 101 can be in contact in a curved state.

[0045] In the technical scheme of the embodiment of the application, in the assembly process, the protrusions 2110 of the through hole 211 can be deformed by being in contact with the head of the plug-in part 101 under force, and after the assembly is completed, the protrusions 2110 can be clamped in the grooves 1012 of the plug-in part 101 and in contact with the plug-in part 101, so that the cover plate assembly 1 and the insulating sheet 2 are connected quickly and stably, that is, the insulating sheet 2 cannot easily separate from the cover plate assembly 1 along the axial direction of the through hole, and the insulating sheet 2 cannot easily deviate from the cover plate assembly 1 along the direction perpendicular to the axis of the through hole.

[0046] It should be noted that the plug-in part 101 can be in a cylindrical shape or an elliptical shape or a quadrangular shape, and the structure shape of the through hole 211 is adapted to the plug-in part 101, and can also be in a circular shape or an elliptical shape or a quadrangular shape. In other embodiments, the structure shape of the through hole 211 can be different from that of the plug-in part 101, as long as the plug-in part 101 can be inserted into the through hole 211 and the protrusions 2110 can be clamped into the grooves 1012. In addition, in order to facilitate manufacturing, the protrusions 2110 and the insulating sheet 2 are integrally formed.

[0047] In some embodiments, the grooves 1012 include a plurality of grooves 1012, which are arranged at intervals along the circumference of the plug-in part 101. The protrusions 2110 include a plurality of protrusions 2110, which are arranged at intervals along the circumferential wall of the through hole 211, and the protrusions 2110 are in one-to-one correspondence with the grooves 1012, and the protrusions 2110 are accommodated in the corresponding grooves 1012. Among them, the grooves 1012 can be two, three, four or more, and the number and position of the protrusions 2110 correspond to the number and position of the grooves 1012, so that the protrusions 2110 can be accommodated in the corresponding grooves 1012. So that each protrusion 2110 of the through hole 211 is respectively accommodated in a groove 1012, so that after the through hole 211 penetrates the plug-in part 101, the insulating sheet 2 is difficult to fall off and move in the vertical direction and the horizontal direction, and the groove wall of the interval arranged groove 1012 can limit the rotation of the protrusion 2110 relative to the plug-in part 101, further avoiding the deviation of the insulating sheet 2, and improving the reliability of the battery monomer.

[0048] Of course, the number of protrusions 2110 and the number of grooves 1012 can also be unequal, for example, one groove 1012 is provided on the outer side wall of the plug-in part 101 and extends along part of the circumference of the plug-in part 101, which is an arc-shaped groove that is not a closed loop, and a plurality of protrusions 2110 can extend into the same groove 1012. Alternatively, a plurality of grooves 1012 are provided along the outer side wall of the plug-in part 101, and a plurality of protrusions 2110 are inserted into each groove 1012.

[0049] Further, in order to better limit the insulation sheet 2, a plurality of grooves 1012 are evenly spaced along the circumference of the insert 101, and a plurality of protrusions 2110 are evenly spaced along the circumference of the hole wall of the through hole 211.

[0050] Specifically, referring to Figure 6 , the cross section of the protrusion 2110 is trapezoidal, and eight protrusions 2110 are evenly spaced along the circumference of the hole wall of the through hole 211; correspondingly, eight grooves 1012 are provided, and the eight grooves 1012 are evenly distributed along the circumference of the insert 101.

[0051] It should be noted here that the more the number of protrusions 2110, the more the direction of limiting the displacement of the insulation sheet 2, but considering that the protrusions 2110 and the grooves 1012 are one-to-one inserted and matched, therefore, the number of protrusions 2110 can be between 3 and 12, specifically, the number of protrusions 2110 can be 4 or 6 or 8 or 10 or 12.

[0052] Further, considering the difficulty of one-to-one insertion and matching of the protrusions 2110 and the grooves 1012, please refer to Figure 9 , the protrusion 2110 includes a connecting end 2111 connected with the insulation sheet 2 and a free end 2112 away from the connecting end 2111; along the circumference of the through hole 211, the width of the connecting end 2111 is greater than the width of the free end 2112, so that the free end 2112 of the protrusion 2110 is more easily inserted into the groove 1012, and the connecting end 2111 of the protrusion 2110 is more stable and connected with the insulation sheet 2, so that it is not easy to break.

[0053] It should be noted that in order to ensure the consistency of processing, the width of the protrusion 2110 can gradually decrease from the connecting end 2111 to the free end 2112 along the circumference of the through hole 211; and the shape of the protrusion 2110 can be various, for example, the protrusion 2110 is trapezoidal (see Figure 6 ), or triangular (see Figure 7 ), or fan-shaped (see Figure 8 ).

[0054] Further, in order to make the design of limiting the displacement of the insulation sheet more flexible, when the groove 1012 is an arc-shaped groove that is not a closed loop, that is, the groove 1012 is arranged along part of the circumference of the insert 101, on the basis of the protrusion 2110 being inserted into the groove 1012, the hole wall of the through hole 211 can be designed to contact the insert 101.

[0055] It can be understood that, since the groove 1012 is an arc-shaped slot that is not closed, that is, the part of the insert 101 other than the groove 1012 can also be in contact with the hole wall of the through hole 211, so that, when the protrusion 2110 is inserted into the groove 1012 and in contact with the insert 101 to limit the insulation sheet 2, the insulation sheet 2 can be further limited from being offset by the part of the insert 101 other than the groove 1012 being in contact with the hole wall of the through hole 211.

[0056] In the embodiment, the first direction can be the length direction of the cover plate assembly 1, and the second direction can be the width direction of the cover plate assembly 1. Figure 12 For the view of the cross section perpendicular to the axis of the through hole and located at the groove 1012; see Figure 12 It can be understood that, since the groove 1012 is an arc-shaped slot that is not closed, that is, the part of the insert 101 other than the groove 1012 can also be in contact with the hole wall of the through hole 211, so that, when the protrusion 2110 is inserted into the groove 1012 and in contact with the insert 101 to limit the insulation sheet 2, the insulation sheet 2 can be further limited from being offset by the part of the insert 101 other than the groove 1012 being in contact with the hole wall of the through hole 211.

[0057] It can be understood that, since the groove 1012 is an arc-shaped slot that is not closed, that is, the part of the insert 101 other than the groove 1012 can also be in contact with the hole wall of the through hole 211, so that, when the protrusion 2110 is inserted into the groove 1012 and in contact with the insert 101 to limit the insulation sheet 2, the insulation sheet 2 can be further limited from being offset by the part of the insert 101 other than the groove 1012 being in contact with the hole wall of the through hole 211.

[0058] It can be understood that, since the groove 1012 is an arc-shaped slot that is not closed, that is, the part of the insert 101 other than the groove 1012 can also be in contact with the hole wall of the through hole 211, so that, when the protrusion 2110 is inserted into the groove 1012 and in contact with the insert 101 to limit the insulation sheet 2, the insulation sheet 2 can be further limited from being offset by the part of the insert 101 other than the groove 1012 being in contact with the hole wall of the through hole 211. Figure 12 It can be understood that, since the groove 1012 is an arc-shaped slot that is not closed, that is, the part of the insert 101 other than the groove 1012 can also be in contact with the hole wall of the through hole 211, so that, when the protrusion 2110 is inserted into the groove 1012 and in contact with the insert 101 to limit the insulation sheet 2, the insulation sheet 2 can be further limited from being offset by the part of the insert 101 other than the groove 1012 being in contact with the hole wall of the through hole 211.

[0059] Figure 3 It can be understood that, since the groove 1012 is an arc-shaped slot that is not closed, that is, the part of the insert 101 other than the groove 1012 can also be in contact with the hole wall of the through hole 211, so that, when the protrusion 2110 is inserted into the groove 1012 and in contact with the insert 101 to limit the insulation sheet 2, the insulation sheet 2 can be further limited from being offset by the part of the insert 101 other than the groove 1012 being in contact with the hole wall of the through hole 211. Figure 5 It can be understood that, since the groove 1012 is an arc-shaped slot that is not closed, that is, the part of the insert 101 other than the groove 1012 can also be in contact with the hole wall of the through hole 211, so that, when the protrusion 2110 is inserted into the groove 1012 and in contact with the insert 101 to limit the insulation sheet 2, the insulation sheet 2 can be further limited from being offset by the part of the insert 101 other than the groove 1012 being in contact with the hole wall of the through hole 211.

[0060] It can be understood that, since the groove 1012 is an arc-shaped slot that is not closed, that is, the part of the insert 101 other than the groove 1012 can also be in contact with the hole wall of the through hole 211, so that, when the protrusion 2110 is inserted into the groove 1012 and in contact with the insert 101 to limit the insulation sheet 2, the insulation sheet 2 can be further limited from being offset by the part of the insert 101 other than the groove 1012 being in contact with the hole wall of the through hole 211.

[0061] It can be understood that, since the groove 1012 is an arc-shaped slot that is not closed, that is, the part of the insert 101 other than the groove 1012 can also be in contact with the hole wall of the through hole 211, so that, when the protrusion 2110 is inserted into the groove 1012 and in contact with the insert 101 to limit the insulation sheet 2, the insulation sheet 2 can be further limited from being offset by the part of the insert 101 other than the groove 1012 being in contact with the hole wall of the through hole 211.

[0062] ​It should be noted that, considering that the groove 1012 is a ring structure, especially when the groove 1012 is a circular ring structure, the insulating sheet 2 and the plug-in 101 can have relative rotation, therefore, the plug-in 101 can be designed to have multiple, to limit the relative rotation of the insulating sheet 2 and the plug-in 101, for example, the plug-in 101 is provided with two or three or four or five.

[0063] It should also be noted that, considering that the insulating sheet can be positioned in more directions and more uniformly, the plurality of protrusions 2110 can be designed to be evenly arranged along the hole wall of the through hole 211. For example, as shown in Figure 6 , the cross section of the protrusion 2110 is trapezoidal, and eight protrusions 2110 are evenly distributed along the hole wall of the through hole 211. Of course, the number of protrusions 2110 can also be 12 or 14 or 16 or 18 or even more, and not only can the width of the connecting end 2111 be designed to be greater than the width of the free end 2112 along the circumference of the through hole 211, for example, the protrusion 2110 is trapezoidal (as shown in Figure 6 ) or triangular (as shown in Figure 7 ) or sector (as shown in Figure 8 ); It can also be designed that the width of the connecting end 2111 is less than the width of the free end 2112 along the circumference of the through hole 211, which is specific to processing.

[0064] Specific to the embodiment, please refer to Figure 4 , the through hole 211 is provided with four, the four through holes 211 are divided into two groups arranged opposite along the first direction, each group of through holes 211 includes two through holes 211 arranged opposite along the second direction, the first direction and the second direction are perpendicular to each other.

[0065] Among them, the first direction can be the length direction of the cover plate assembly 1, and the second direction can be the width direction of the cover plate assembly 1. The structure of the four through holes 211 can be the same or different.

[0066] In the technical scheme of the embodiment of the application, the above-mentioned structure is provided to limit the rotation of the insulating sheet 2 and avoid the offset movement of the insulating sheet 2.

[0067] In some embodiments, please refer to Figure 5 , in order to better guide the plug-in 101 and the through hole 211 to be inserted, the plug-in 101 includes a head 1011, and the side of the head 1011 away from the cover plate assembly 1 is a tapered surface.

[0068] In the technical scheme of the embodiment of the application, the above-mentioned structure is provided, and the plurality of protrusions 2110 are better expanded and deformed under the guidance of the tapered surface, thereby playing a guiding role, so as to better be inserted with the through hole 211.

[0069] Specifically, please refer to Figure 5As shown, the plug-in 101 further comprises a column part connected to the head 1011 at one end away from the cover plate assembly 1, and a groove 1012 is formed on the outer circumferential surface of the column part.

[0070] In some embodiments, referring to Figure 1 and Figure 5 , the cover plate assembly 1 comprises a cover plate 11 and an insulating plate 10 arranged on the side of the cover plate 11 facing the battery cell, and at least one plug-in 101 arranged on the side of the insulating plate 10 facing the battery cell, wherein, for the convenience of manufacturing, the plug-in 101 and the insulating plate 10 are integrally formed.

[0071] Further, considering that the pole 111 arranged on the cover plate 11 penetrates the accommodation hole 102 on the insulating plate 10, and the end of the pole 111 facing the battery cell protrudes from the insulating plate 10, in order to better support the insulating sheet 2, the plug-in 101 further comprises a root part 1013, and the column part is connected to the insulating plate 10 through the root part 1013, wherein the height of the root part 1013 does not protrude from the end surface of the pole 111 facing the battery cell, that is, the groove side wall arranged near the insulating plate 10 in the groove 1012 does not protrude from the end surface of the pole 111 facing the battery cell.

[0072] Further, the groove side wall arranged near the insulating plate 10 in the groove 1012 is flush with the end surface of the pole 111 facing the battery cell, so that the assembly plane of the insulating sheet 2 can be ensured to be flush, and assembly problems such as wrinkles are not easy to occur.

[0073] It should be noted that the plug-in 101 on the insulating plate 10 is arranged away from the position of the adapter sheet 3 to avoid hindering the installation of the adapter sheet.

[0074] In some embodiments, as shown in Figure 5 , the plug-in 101 is in a cylindrical shape, and the maximum outer diameter of the head 1011 is φ3. As shown in Figure 6 , the minimum inner diameter of the space formed by the plurality of protruding teeth 2110 in the natural state is φ2, and the diameter of the through hole 211 is φ1, and φ1≥φ3>φ2 is satisfied.

[0075] When the insulating sheet 2 and the plug-in 101 are assembled, as shown in Figure 10 , where A is the initial state of the insulating sheet 2, B is the assembly state of the insulating sheet 2 when the protruding teeth 2110 are deformed under the force of the head of the plug-in 101, and C is the final state of the insulating sheet 2 when the protruding teeth 2110 are inserted into the groove 1012 to complete the assembly, because φ1≥φ3>φ2, the protruding teeth 2110 will deform during assembly, and then be clamped into the groove 1012 after assembly is completed, and be in contact with the plug-in 101, thereby ensuring that the plug-in 101 and the through hole 211 are difficult to fall off and slide relative to each other.

[0076] In some embodiments, as shown in Figure 5As shown, the groove bottom diameter of the groove 1012 is φ4, and satisfies: φ2≤φ4.

[0077] When φ2=φ4, as shown, after the assembly of the insulating sheet 2 and the insert 101, the free end 2112 of the protrusion 2110 extends radially and contacts the groove bottom of the groove 1012, ensuring that the insert 101 and the through hole 211 are difficult to fall off and slide relative to each other. When φ2<φ4, after the assembly of the insulating sheet 2 and the insert 101, the free end 2112 of the protrusion 2110 is deformed and bent and contacts the insert 101. Figure 10

[0078] In some embodiments, the battery monomer further comprises a connecting sheet 3, the electric core comprises a tab, one end of the connecting sheet 3 is connected to the tab, and the other end is connected to the pole 111, and the insulating sheet 2 is arranged between the connecting sheet 3 and the pole 111.

[0079] In some embodiments, the insulating sheet 2 is made of PP material. The thickness of the insulating sheet 2 is 0.1 mm. The insulating sheet 2 comprises a first base sheet 21 and a second base sheet 22, the through hole 211 is arranged on the first base sheet 21, the first base sheet 21 is arranged between the connecting sheet 3 and the pole 111, and the second base sheet 22 covers the large side and the bottom side of the electric core and is fixed at the bottom of the electric core by a hot melting method with the electric core support plate 23.

[0080] During assembly, after the tab of the electric core is ultrasonically welded with the connecting sheet 3, the cover plate assembly 1 is placed in a welding clamp, the first base sheet 21 of the insulating sheet 2 is placed on the cover plate assembly 1, and the first base sheet 21 is fixed and installed through the through hole 211 and the insert 101, realizing the fixation of the insulating sheet 2 and the insulating plate 10, and then the connecting sheet 3 is laser welded with the pole 111, greatly reducing the probability of welding explosion, laser leakage and other adverse risks.

[0081] On the other hand, the application also provides a battery comprising the battery monomer.

[0082] The above only describes the preferred embodiments of the application and is not intended to limit the application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the application shall be included in the protection scope of the application.​

Claims

1. A battery cell, characterized by, The battery cell comprises: a cell core; a cover plate assembly (1) provided with at least one insert (101) on a side facing the cell core, wherein a peripheral wall of the insert (101) is provided with a groove (1012); an insulating sheet (2) at least partially arranged between the cover plate assembly (1) and the cell core, wherein the insulating sheet (2) is provided with a through hole (211) corresponding to the insert (101), a hole wall of the through hole (211) is connected with a protruding tooth (2110), the insert (101) penetrates through the through hole (211), at least part of the protruding tooth (2110) is located in the groove (1012), and the protruding tooth (2110) is in contact with the insert (101).

2. The battery cell of claim 1, wherein, The groove (1012) comprises a plurality of grooves (1012) which are distributed along the circumference of the insert (101) at intervals. The protruding tooth (2110) comprises a plurality of protruding teeth (2110) which are arranged along the hole wall of the through hole (211) at intervals in the circumferential direction, the protruding tooth (2110) is in one-to-one correspondence with the groove (1012), and the protruding tooth (2110) is accommodated in the corresponding groove (1012).

3. The battery cell of claim 1, wherein, The groove (1012) has a ring structure surrounding the circumference of the insert (101), the protruding tooth (2110) comprises a plurality of protruding teeth (2110) which are arranged along the hole wall of the through hole (211) at intervals in the circumferential direction, and all the protruding teeth (2110) are accommodated in the groove (1012).

4. The battery cell according to claim 2 or 3, characterized in that, The plurality of protruding teeth (2110) are arranged at equal intervals in the circumferential direction of the hole wall of the through hole (211).

5. The battery cell according to any one of claims 1 to 3, characterized in that, The protruding tooth (2110) comprises a connecting end (2111) connected with the insulating sheet (2) and a free end (2112) arranged away from the connecting end (2111); along the circumferential direction of the through hole (211), the width of the connecting end (2111) is greater than the width of the free end (2112).

6. The battery cell of claim 2, wherein, The hole wall of the through hole (211) is in contact with the insert (101).

7. The battery cell of claim 1, wherein, The through hole (211) comprises four through holes (211) which are divided into two groups arranged opposite to each other in a first direction, each group of through holes (211) comprises two through holes (211) arranged opposite to each other in a second direction, and the first direction and the second direction are perpendicular to each other.

8. The battery cell of claim 1, wherein, The protruding tooth (2110) and the insulating sheet (2) are in an integrated structure.

9. The battery cell of claim 1, wherein, The insert (101) comprises a head portion (1011), and a side of the head portion (1011) away from the cover plate assembly (1) is a tapered surface.

10. A battery, characterized by The battery cell comprises any one of claims 1 to 9.

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