Top cover assembly and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a top cover assembly and a battery, and the top cover assembly comprises a top cover provided with a first through hole penetrating along a first direction; the first insulating part is connected with one side, in the first direction, of the top cover, a first groove is formed in the side, back on to the top cover, of the first insulating part, a second through hole penetrating in the first direction is formed in the bottom wall of the first groove, the bottom wall of the first groove is provided with a plurality of side edges connected in sequence, the minimum distance H1 between at least one side edge and the second through hole is smaller than or equal to 5 mm; the pole comprises a pole main body and an annular edge, the pole main body penetrates through the first through hole and the second through hole, the annular edge is arranged on the peripheral surface of the pole main body and extends in the circumferential direction of the pole main body, and the annular edge is located in the first groove and abuts against the bottom wall of the first groove. According to the top cover assembly disclosed by the embodiment of the utility model, the size of the annular edge can be reduced, so that the weight of the pole is reduced, and the energy density of the battery is further improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a top cover assembly and a battery. Background Technology

[0002] A battery typically includes terminals, a top cover, and a lower plastic layer. The top cover and lower plastic layer are stacked together, and the terminals pass through the top cover and lower plastic layer. The ends of the terminals abut against the side of the lower plastic layer facing away from the top cover to fix the position of the terminals. However, in related technologies, the overlap area between the ends of the terminals and the lower plastic layer is relatively large. Although this ensures the positioning effect between the ends of the terminals and the lower plastic layer, it results in a larger volume of the ends of the terminals, which in turn leads to a higher weight of the terminals and affects the energy density of the battery. Utility Model Content

[0003] In view of this, the present invention provides a top cover assembly and a battery to solve the problem that the high weight of the terminal post affects the energy density of the battery.

[0004] In a first aspect, the present invention provides a top cover assembly, comprising: a top cover having a first through hole extending along a first direction; a first insulating member connected to the top cover on one side in the first direction, the first insulating member having a first groove on the side facing away from the top cover, the bottom wall of the first groove having a second through hole extending along the first direction, the bottom wall of the first groove having a plurality of side edges connected in sequence, at least one of the side edges having a minimum distance of H1 from the second through hole, H1≤5mm; and a pole post including a pole body and a ring edge, the pole body passing through the first through hole and the second through hole, the ring edge being disposed on the outer peripheral surface of the pole body and extending along the circumferential direction of the pole body, the ring edge being located in the first groove and abutting against the bottom wall of the first groove.

[0005] In one alternative embodiment, the side is tangential to the second through hole.

[0006] In one optional embodiment, the plurality of side edges include a plurality of straight edges and a plurality of transition edges, the plurality of straight edges and the plurality of transition edges are arranged alternately along the circumference of the second through hole, the minimum distance between the straight edge and the second through hole is H1, the maximum distance between the transition edge and the second through hole is H2, and H1 < H2.

[0007] In one alternative embodiment, along the second direction, the dimension of the column body is L1, the dimension of the ring edge is L2, 1≤L2 / L1≤3, and the second direction is intersecting the first direction.

[0008] In one alternative implementation, one of the plurality of transition edges is constructed as a straight line, while the remaining transition edges are constructed as curved edges.

[0009] In an alternative embodiment, the top cover is provided with a convex bump protruding away from the first insulating member, the convex bump is provided with a second groove on a side facing the first insulating member, the first insulating member is provided with a convex protrusion on a side facing the top cover, the convex protrusion is arranged corresponding to the first groove, and the convex protrusion is inserted into the second groove.

[0010] In an alternative embodiment, the convex bump has a size of 0.2mm-2.5mm in the first direction.

[0011] In an alternative embodiment, the side wall of the second groove has a flat surface, and the flat surface is arranged perpendicularly to a plane of the top cover facing the first insulating member.

[0012] In an alternative embodiment, the top cover is provided with a sink on a side facing the first insulating member, and the sink is arranged on a side of the flat surface away from the pole column; the first insulating member is provided with a sink table on a side facing the top cover, and the sink table is arranged in the sink.

[0013] In an alternative embodiment, the flat surface is a plurality of flat surfaces, and the plurality of flat surfaces are arranged in a circumferential direction of the second groove; the sink is a plurality of sinks, and the plurality of sinks and the plurality of flat surfaces are arranged one-to-one; the sink table is a plurality of sink tables, and the plurality of sink tables are arranged one-to-one in the plurality of sinks.

[0014] In an alternative embodiment, the pole column further comprises a flange, the flange is arranged at an end of the column body away from the ring edge, the flange is arranged on an outer circumferential surface of the column body and extends in a circumferential direction of the column body; the top cover assembly further comprises a second insulating member, the second insulating member is arranged between the top cover and the pole column, and comprises a first ring portion, a second ring portion, a third ring portion, and a lug, the first ring portion and the third ring portion are both connected to the second ring portion, the flange abuts against a side of the second ring portion away from the first insulating member, the first ring portion surrounds the flange, the third ring portion surrounds the column body, and the lug is arranged on an outer circumferential surface of the first ring portion.

[0015] In an alternative embodiment, the lug is two lugs, and the two lugs are located on opposite sides in a radial direction of the second insulating member.

[0016] In an alternative embodiment, the top cover is provided with a positioning groove on a side away from the first insulating member, and the lug is located in the positioning groove.

[0017] In an alternative embodiment, the lugs correspond to a central angle of 3° to 25°; and / or the dimension of the lugs in the first direction is D1, the dimension of the flange in the first direction is D2, 0.8≤D1 / D2≤5; and / or the radius of the inner circumferential surface of the third ring portion is R1, the minimum distance between the outer circumferential surface of the lug and the center of the third ring portion in the radial direction of the second insulating member is R2, 1

[0018] In an alternative embodiment, a gasket is provided between the side of the second ring portion facing away from the first insulating member and the flange, the gasket having a yield strength in the range of 150 MPa or more.

[0019] In an alternative embodiment, the material of the gasket is aluminum or an aluminum alloy.

[0020] In a second aspect, the utility model also provides a battery, include: shell, be equipped with opening and accommodating cavity, the opening with the accommodating cavity intercommunication, electric core, be located in the accommodating cavity and include tab, the top cover assembly of first aspect, the top cover with the shell is connected and covers the opening, the first insulating member is located the side of the top cover towards the accommodating cavity, the pole is connected with the tab.

[0021] The top cover assembly of the utility model embodiment, by being provided with the first groove in the first insulating member, the ring edge can be accommodated, and the ring edge is stopped on the bottom wall of the second groove, which can limit the relative position among the pole, the top cover and the first insulating member on the one hand, and can reduce the occupation of the ring edge in the internal space of the battery, and improve the energy density of the battery. Moreover, the minimum distance between at least one of the side edges of the first groove and the second through hole is not more than 5mm, and the distance between the side edge and the second through hole is relatively small, so the dimension of the ring edge extending from the pole main body to the straight edge direction is relatively small, which can achieve the purpose of reducing the volume of the ring edge, thereby reducing the material of the pole, reducing the weight of the pole, and further improving the energy density of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the specific embodiment of the utility model or prior art, the drawings needed to be used in the following specific embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0023] Figure 1 It is a structural schematic view of the battery of the utility model embodiment.

[0024] Figure 2 It is a sectional view of the battery of the utility model embodiment.

[0025] Figure 3 For Figure 2 partial enlarged view of the middle A;

[0026] Figure 4 is the partial sectional view of the top cover assembly of the utility model embodiment;

[0027] Figure 5 is the exploded view of the top cover assembly of the utility model embodiment;

[0028] Figure 6 is one of the structure schematic diagram of the first insulation piece of the utility model embodiment;

[0029] Figure 7 is the structure schematic diagram of the first insulation piece of the utility model embodiment two;

[0030] Figure 8 is the structure schematic diagram of the first insulation piece of the utility model embodiment three;

[0031] Figure 9 is the structure schematic diagram of the utility model embodiment pole;

[0032] Figure 10 is the structure schematic diagram of the utility model embodiment top cover;

[0033] Figure 11 is one of the structure schematic diagram of the second insulation piece of the utility model embodiment;

[0034] Figure 12 is one of the structure schematic diagram of the second insulation piece of the utility model embodiment.

[0035] Explanation of reference signs:

[0036] 1, top cover assembly; 2, shell; 3, battery; 4, electric core; 5, containing cavity;

[0037] 100, top cover; 110, first through hole; 120, convex hull; 130, second recess; 131, flat surface; 132, arc surface; 140, sink groove; 150, positioning groove;

[0038] 200, first insulation piece; 210, second through hole; 220, first recess; 221, straight edge; 222, transition edge; 230, sink table; 240, protrusion;

[0039] 300, pole; 310, column main body; 320, ring edge; 330, turn edge;

[0040] 400, second insulation piece; 410, first ring part; 420, second ring part; 430, third ring part; 440, lug;

[0041] 500, gasket; 600, seal. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" 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.

[0044] In the description of the present application, the meaning of "multiple" is two or more. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] The embodiments of the present application will be described below in combination with Figures 1 to 12 .

[0047] According to the embodiments of the present application, on the one hand, a top cover assembly 1 is provided, which comprises a top cover 100, a first insulating piece 200 and a pole 300.

[0048] The top cover 100 is provided with a first through hole 110 penetrating in the first direction, the first insulating part 200 is connected to one side of the top cover 100 in the first direction, the side of the first insulating part 200 away from the top cover 100 is provided with a first recess 220, the bottom wall of the first recess 220 is provided with a second through hole 210 penetrating in the first direction, and the bottom wall of the first recess 220 has a plurality of side edges connected in sequence, and the minimum distance between at least one side edge and the second through hole 210 is H1, and H1≤5mm. Wherein, H1 can be 0mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

[0049] The pole 300 includes a pole body 310 and a ring edge 320, the pole body 310 penetrates the first through hole 110 and the second through hole 210, the ring edge 320 is arranged on the outer circumferential surface of the pole body 310 and extends along the circumferential direction of the pole body 310, and the ring edge 320 is located in the first recess 220 and abuts against the bottom wall of the first recess 220.

[0050] By arranging the first recess 220 and locating the ring edge 320 in the first recess 220 and abutting against the bottom wall of the first recess 220, on the one hand, the relative positions of the pole 300, the top cover 100 and the first insulating part 200 in the first direction can be limited to prevent the pole 300 from protruding excessively, and on the other hand, the ring edge 320 of the pole 300 is accommodated in the first recess 220, which can reduce the size of the pole 300 protruding from the side of the first insulating part 200 away from the top cover 100, thereby reducing the space occupied by the pole 300 in the accommodation cavity 5 of the shell 2 of the battery 3, so as to arrange larger volume of battery cells 4 and more electrolyte in the accommodation cavity 5, which is beneficial to improve the energy density of the battery 3.

[0051] In addition, by arranging the minimum distance between at least one side edge and the second through hole 210 as H1, and H1≤5mm, the gap between the side edge and the second through hole 210 is relatively small, so the size of the ring edge 320 extending from the pole body 310 to the side edge direction is relatively small, which can achieve the purpose of reducing the volume of the ring edge 320, thereby reducing the material of the pole 300, reducing the cost and weight of the pole 300, and further improving the energy density of the battery 3.

[0052] As shown in Figure 4 and Figure 7 In some embodiments, at least one side edge is arranged tangentially to the second through hole 210, that is, the distance between the side edge and the second through hole 210 is 0mm, and the side edge is perpendicular to the radial direction of the second through hole 210. In this way, the distance between the side edge and the second through hole 210 is smaller, further reducing the volume of the ring edge 320, thereby further reducing the material of the pole 300, reducing the cost and weight of the pole 300, and further improving the energy density of the battery 3.

[0053] It should be noted that in some embodiments, all sides are tangent to the second through hole 210.

[0054] like Figures 6-8 As shown, in some embodiments, the multiple side edges include multiple straight edges 221 and multiple transition edges 222. The multiple straight edges 221 and multiple transition edges 222 are arranged alternately in a ring along the circumference of the second through hole 210. The minimum distance between the straight edge 221 and the second through hole 210 is H1, and the minimum distance between the transition edge 222 and the second through hole 210 is H2, where H1 < H2.

[0055] By setting a transition edge 222, which connects two adjacent straight edges 221, and the distance between the transition edge 222 and the second through hole 210 is relatively large, the bottom wall of the first groove 220 located between the transition edge 222 and the second through hole 210 can make large-area contact with the ring edge 320 to achieve reliable positioning between the pole post 300 and the first insulating member 200.

[0056] The top cover assembly 1 of this utility model has a straight edge 221 and a transition edge 222 on the bottom wall of the second insulating member 400. While ensuring reliable positioning between the pole post 300 and the first insulating member 200, it can effectively reduce the volume of the circumferential edge 320 of the pole post 300, thereby reducing the weight and cost of the pole post 300 and further improving the energy density of the battery 3.

[0057] like Figures 5-9 As shown, in some embodiments, along the second direction, at least one side of the column body 310 is provided with a straight edge 221, the size of the column body 310 is L1, the size of the ring edge 320 is L2, 1≤L2 / L1≤3, and the second direction is arranged to intersect with the first direction.

[0058] Where L2 / L1 can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3;

[0059] L1 can be 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, 20mm, 20.5mm, 21mm, 21.5mm, 22mm, 22.5mm, 23mm, 23.5mm, 24mm, 24.5mm, or 25mm;

[0060] L2 can be 20 mm, 20.5 mm, 21 mm, 21.5 mm, 22 mm, 22.5 mm, 23 mm, 23.5 mm, 24 mm, 24.5 mm, 25 mm, 26.5 mm, 27 mm, 28.5 mm, 29 mm, 29.5 mm, or 30 mm.

[0061] By setting L2 / L1 to be no less than 1, it can be avoided that the size of the ring edge 320 is too small to be set; by setting L2 / L1 to be no more than 3, it can be avoided that the size of the ring edge 320 is too large, since at least one side of the column body 310 is provided with a straight edge 221 along the second direction, the side wall spacing between the second through hole 210 and the first recess 220 is small along the second direction, and the ring edge 320 located on the side of the column body 310 along the second direction does not need or almost does not need to abut against the bottom wall of the first recess 220, so the size of the ring edge 320 located on the side of the column body 310 along the second direction can be reduced, the material can be saved, the cost and weight can be reduced, and the energy density of the battery 3 can be further improved.

[0062] As shown in Figures 6-8 In some embodiments, one of the plurality of transition edges 222 is configured as a straight line, and the rest of the transition edges 222 are all configured as arcs. The stress between the two straight edges 221 connected by the arc-shaped transition edges 222 is uniform, which can avoid stress concentration, and configuring one of the transition edges 222 as a straight line can play a foolproof role and improve assembly accuracy.

[0063] For example, the number of straight edges 221 and transition edges 222 is four, three transition edges 222 are configured as arcs, and one transition edge 222 is configured as a straight line. Along the second direction, opposite sides of the column body 310 are both provided with straight edges 221, and along the third direction, opposite sides of the column body 310 are both provided with straight edges 221.

[0064] As shown in Figure 5 and Figure 10 In some embodiments, the top cover 100 is provided with a convex bundle 120, the convex bundle 120 protrudes away from the first insulating piece 200, the side of the convex bundle 120 facing the first insulating piece 200 is provided with a second recess 130, the side of the first insulating piece 200 facing the top cover 100 is provided with a protrusion 240, the protrusion 240 is correspondingly arranged with the first recess 220, the protrusion 240 is inserted into the second recess 130, and the size of the convex bundle 120 along the first direction is not greater than the size of the rest of the top cover 100 along the first direction.

[0065] By setting the second groove 130, which can be used to accommodate the protrusion 240, the positioning between the first insulating piece 200 and the top cover 100 can be achieved, and the space occupied by the pole 300 in the accommodating cavity 5 in the battery 3 shell 2 can be reduced, and the energy density of the battery 3 can be improved.

[0066] By setting the convex 120, the convex 120 protrudes away from the first insulating piece 200, and the second groove 130 is arranged in the convex 120, which can avoid the thickness of the top cover 100 being excessively thinned due to the arrangement of the second groove 130, and is beneficial to ensure the structural strength of the top cover 100 in the area of the second groove 130, and reduce the probability of damage to the top cover 100.

[0067] By setting the protrusion 240, the protrusion 240 protrudes towards the top cover 100, and the protrusion 240 is arranged corresponding to the first groove 220, which can avoid the thickness of the first insulating piece 200 being excessively thinned due to the arrangement of the first groove 220, and is beneficial to ensure the structural strength of the first insulating piece 200 in the area of the first groove 220, and reduce the probability of damage to the first insulating piece 200.

[0068] Further, the size of the convex 120 in the first direction is 0.2mm-2.5mm. Among them, the size of the convex 120 in the first direction can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm or 2.5mm.

[0069] When the size of the convex 120 in the first direction is less than 0.2mm, the structural strength of the convex 120 is low and is easy to deform and damage; when the size of the convex 120 in the first direction is greater than 0.2mm, the size of the convex 120 in the first direction is large, and in combination with the convex protruding from the rest of the top cover 100, it can cause the overall size of the top cover 100 in the first direction to be too large, thereby causing the required arrangement space of the battery 3 to be large.

[0070] By setting the size of the convex in the first direction to be not less than 0.2mm, the structural strength of the convex 120 can be ensured, and the convex is not easy to deform, which is beneficial to prolong the service life of the top cover 100; by setting the size of the convex in the first direction to be not greater than 2.5mm, the size of the convex 120 in the first direction is avoided to be too large, the size of the top cover 100 in the first direction is reduced, and the required arrangement space of the battery 3 is also reduced.

[0071] As Figure 3 and Figure 10As shown, in some embodiments, the sidewall of the second groove 130 has a flat surface 131, which is arranged perpendicularly to the plane of the top cover 100 facing the first insulating member 200. The sidewall of the second groove 130 also has an arc surface 132, which is arranged along the circumference of the second groove 130 and is connected to the bottom wall of the second groove 130 and the side of the top cover 100 facing the first insulating member 200, so as to achieve an arc transition between the bottom wall of the second groove 130 and the side of the top cover 100 facing the first insulating member 200, which is conducive to reducing material usage and making the overall stress more uniform.

[0072] After the welding of the pole 300 and the external connecting piece (tab), external force applied to the external connecting piece will be transmitted to the pole 300. By arranging the flat surface 131, the flat surface 131 and the pole 300 transmit force through the first insulating member 200, the flat surface 131 can limit the position of the first insulating member 200, avoid the rotation of the first insulating member 200, and further limit the position of the pole 300, prevent the rotation of the pole 300, which is conducive to ensuring the position reliability of the pole 300, and further improves the electrical connection reliability of the battery 3.

[0073] Further, the side of the top cover 100 facing the first insulating member 200 is provided with a sink groove 140, which is arranged on the side of the flat surface (131) away from the pole (300); the side of the first insulating member 200 facing the top cover 100 is provided with a sink table 230, which is arranged in the sink groove 140. The sink groove 140 and the second groove 130 can be arranged separately, and the cross-sectional area of the sink groove 140 gradually increases towards the first insulating member 200, so as to facilitate the insertion of the sink table 230 into the sink groove 140.

[0074] By arranging the sink table 230 and the sink groove 140 in cooperation, the relative position between the top cover 100 and the first insulating member 200 can be positioned, which is conducive to the assembly of the top cover assembly 1. Moreover, since the sink groove 140 and the flat surface 131 are arranged correspondingly, the sink table 230 can support the flat surface 131 after being inserted into the sink groove 140, which is conducive to ensuring the shape of the flat surface 131, so as to improve the limiting effect of the flat surface 131 on the pole 300.

[0075] Specifically, the flat surface 131 is a plurality of flat surfaces 131 arranged separately along the circumference of the second groove 130. The sink groove 140 is a plurality of sink grooves 140 arranged one-to-one with the plurality of flat surfaces 131. The sink table 230 is a plurality of sink tables 230 arranged one-to-one in the sink groove 140.

[0076] In this way, the force transmission path between the flat surface 131 as a whole and the pole column 300 is more, and the anti-rotation limiting effect of the flat surface 131 on the pole column 300 can be increased; by increasing the sink groove 140 and the sink table 230, the positioning effect between the top cover 100 and the first insulating piece 200 is better.

[0077] As shown in Figures 3-5 、 Figures 9-12 In some embodiments, the pole column 300 further includes a flange 330, which is arranged at one end of the column body 310 away from the ring edge 320 and extends along the circumference of the column body 310. The top cover assembly 1 further includes a second insulating piece 400 arranged between the top cover 100 and the pole column 300.

[0078] The second insulating piece 400 includes a first ring portion 410, a second ring portion 420, a third ring portion 430, and a lug 440. The first ring portion 410 and the third ring portion 430 are both connected with the second ring portion 420, the flange 330 abuts against one side of the second ring portion 420 away from the first insulating piece 200, the first ring portion 410 surrounds the flange 330, the third ring portion 430 surrounds the column body 310, and the lug 440 is arranged on the outer circumferential surface of the first ring portion 410.

[0079] By arranging the second insulating piece 400, the ring edge 320 and the flange 330 clamp the first insulating piece 200, the top cover 100, and the second insulating piece 400 in the first direction, the relative positions of the pole column 300, the first insulating piece 200, the top cover 100, and the second insulating piece 400 in the first direction can be limited, and the second insulating piece 400 can separate the flange 330 and the top cover 100 to avoid electrical connection between the pole column 300 and the top cover 100, thereby improving the safety of the battery 3.

[0080] In addition, the second insulating piece 400 can be injection molded from a plastic material. During the injection molding process, the second insulating piece 400 has a relatively weak strength at the glue injection port and the joint. By arranging the lug 440 at the glue injection port or the joint, the structural strength of the second insulating piece 400 can be improved, the second insulating piece 400 can be prevented from being broken under stress, and the service life of the second insulating piece 400 can be prolonged.

[0081] Generally, the glue injection port and the joint of the second insulating piece 400 are located on opposite sides in the radial direction of the second insulating piece 400. Further, the lug 440 is two, and the two lugs 440 are located on opposite sides in the radial direction of the second insulating piece 400. In this way, the two lugs 440 are respectively located at the glue injection port and the joint, which can further increase the structural strength of the second insulating piece 400, prevent the second insulating piece 400 from being broken under stress, and prolong the service life of the second insulating piece 400.

[0082] Further, the side of the top cover 100 facing away from the second insulating member 400 is provided with a positioning groove 150, and the lug 440 is located in the positioning groove 150. Through the cooperation of the boss and the positioning groove 150, the positioning between the second insulating member 400 and the top cover 100 can be achieved, the relative rotation between the second insulating member 400 and the top cover 100 is prevented, and then the pole 300 can be positioned, the rotation of the pole 300 is prevented, the position reliability of the pole 300 is beneficial to be ensured, and then the electrical connection reliability of the battery 3 is improved.

[0083] Specifically, as shown in Figure 11 and Figure 12 , the angle of the central angle R corresponding to the lug 440 is 3°-25°. Among them, the angle of the central angle R corresponding to the lug 440 is 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24° or 25°.

[0084] It should be noted that the projection of the lug 440 along the first direction and the projection of the first ring part 410 along the first direction have two intersection points, and the included angle between the two intersection points and the line connecting the center of the projection of the first ring part 410 along the first direction is the central angle R corresponding to the lug 440.

[0085] The positioning groove 150 is arranged on the convex bump 120, the convex bump 120 has four arc-shaped corners, and the line connecting the endpoints of the arc-shaped corners and the center of the second insulating member 400 can define a sector face. The area of the sector face is large, the positioning groove 150 is arranged on the sector face, by setting the angle of the central angle corresponding to the lug 440 to be not greater than 25°, the lug 440 can be avoided to exceed the range of the sector face, and then the positioning groove 150 is avoided to exceed the sector face, which is beneficial to the structure of the positioning groove 150, and the arc length of the lug 440 will not be too large, which can avoid excessive material consumption to cause excessive weight and cost.

[0086] Further, by setting the angle of the central angle corresponding to the lug 440 to be not less than 3°, the arc length of the lug 440 can be avoided to be too small, so as to ensure the structural strength of the lug 440, and then the strengthening effect of the lug 440 on the structure of the second insulating member 400 is improved.

[0087] In some embodiments, the size of the lug 440 in the first direction is D1, the size of the flange 330 in the first direction is D2, and 0.8≤D1 / D2≤5.

[0088] Among them, D1 / D2 can be 0.8, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5 or 5;

[0089] D1 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm;

[0090] D2 can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, or 1 mm.

[0091] By setting D1 / D2 to be no less than 0.8, the size of the lug 440 in the first direction can be kept large enough, the lug 440 has a good reinforcing effect on the second insulating member 400, and the probability of breakage of the second insulating member 400 is effectively reduced. By setting D1 / D2 to be no more than 5, the size of the lug 440 in the first direction can be avoided to be too large, the material is reduced, the weight and cost of the second insulating member 400 are reduced, and the lug 440 can be avoided to exceed the side of the battery cell 4 away from the pole 300, which is conducive to the connection between the pole 300 and the external connecting piece (tab).

[0092] In some embodiments, as shown in FIG. 4A, the radius of the inner circumferential surface of the third ring portion 430 is R1, the minimum distance between the outer circumferential surface of the lug 440 and the center of the third ring portion 430 in the radial direction of the second insulating member 400 is R2, and 1 Figure 12

[0093] wherein R2 / R1 can be 1.1, 1.2, 1.3, 1.4, 1.45, 1.5, 1.6, 1.7, 1.8, 1.9, or 2;

[0094] R1 can be 9 mm, 9.1 mm, 9.2 mm, 9.3 mm, 9.4 mm, 9.5 mm, 9.6 mm, 9.7 mm, 9.8 mm, 9.9 mm, 10 mm, 10.1 mm, 10.2 mm, 10.3 mm, 10.4 mm, or 10.5 mm;

[0095] R2 can be 14 mm, 14.1 mm, 14.2 mm, 14.3 mm, 14.4 mm, 14.5 mm, 14.6 mm, 14.8 mm, 14.9 mm, or 15 mm.

[0096] ​By setting R2 / R1 to be no less than 1, the size of the lug 440 in the radial direction of the second insulating member 400 can be kept large enough, the reinforcing effect of the lug 440 on the second insulating member 400 is good, and the probability of breakage of the second insulating member 400 is effectively reduced. By setting R2 / R1 to be no greater than 2, the size of the lug 440 in the radial direction of the second insulating member 400 can be avoided to be too large, the material usage is reduced, the weight and cost of the second insulating member 400 are reduced, and the energy density of the battery 3 can be further improved.

[0097] As shown in FIG. 1, in some embodiments, a mounting space is defined between the pole 300 and the top cover 100, and the second insulating member 400 is in clearance fit with the mounting space. The top cover assembly 1 further includes a sealing member 600, which is located in the second through hole 210 and is clamped between the top cover 100 and the ring edge 320. The sealing member 600 can be a rubber member or a silicone member, etc. having elastic sealing capability. Figure 3

[0098] As shown in FIG. 1, in some embodiments, a mounting space is defined between the pole 300 and the top cover 100, and the second insulating member 400 is in clearance fit with the mounting space. The top cover assembly 1 further includes a sealing member 600, which is located in the second through hole 210 and is clamped between the top cover 100 and the ring edge 320. The sealing member 600 can be a rubber member or a silicone member, etc. having elastic sealing capability. Figure 3 Figure 4 As shown in FIG. 1, in some embodiments, a gasket 500 is arranged between the side of the second ring portion 420 facing away from the first insulating member 200 and the flange 330. The yield strength range of the gasket 500 is greater than or equal to 150 MPa, and the gasket 500 is made of a material that does not electrochemically react with the pole 300.

[0099] By arranging the gasket 500, the pressure generated during the folding of the flange 330 is first applied to the gasket 500 and then transmitted to the second insulating member 400 through the gasket 500, which can avoid stress concentration on the second insulating member 400 and make the overall stress on the second insulating member 400 more uniform, thereby reducing the probability of breakage of the second insulating member 400.

[0100] By setting the yield strength range of the gasket 500 to be no less than 150 MPa, the probability of stress deformation of the gasket 500 can be reduced, so that the gasket 500 can maintain its shape under the folding pressure of the flange 330 to uniformly transmit the pressure to the second insulating member 400.

[0101] The gasket 500 is made of a material that does not electrochemically react with the pole 300, which can slow down the corrosion rate of the gasket 500 and the pole 300 and prolong the service life of the gasket 500 and the pole 300.

[0102] Further, the material of the gasket 500 is aluminum or aluminum alloy. Compared with the gasket made of stainless steel, the gasket 500 made of aluminum or aluminum alloy is less likely to electrochemically react with the pole 300, which can slow down the corrosion rate of the gasket 500 and the pole 300 and prolong the service life of the gasket 500 and the pole 300.

[0103] ​​According to the embodiment of the utility model, on the other hand, still provide a kind of battery 3, such as Figure 1 And Figure 2 As shown in the battery 3 includes shell 2, electric core 4 and the above-mentioned top cover assembly 1.

[0104] Shell 2 is equipped with opening and accommodating cavity 5, opening and accommodating cavity 5 are communicated, electric core 4 is located in accommodating cavity 5 and includes tab, top cover 100 is connected with shell 2 and covers opening, first insulating part 200 is located in the side of top cover 100 towards accommodating cavity 5, pole 300 is connected with tab.

[0105] The battery 3 of the embodiment of the utility model, by the above-mentioned top cover assembly 1, can reduce the weight and cost of pole 300 while ensuring reliable positioning between first insulating part 200 and pole 300, and can improve the energy density of battery 3.

[0106] Although the embodiments of the utility model are described in conjunction with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cap assembly, characterized by, The utility model relates to a top cover (100) is provided with the first through -hole (110) along the first direction, first insulation piece (200) is connected with the top cover (100) in the first direction one side, the first insulation piece (200) is provided with the first recess (220) to the side of top cover (100) back, the bottom wall of first recess (220) is provided with the second through -hole (210) along the first direction, the bottom wall of first recess (220) has sequentially connected multiple side edges, at least one side edge and the minimum distance of second through -hole (210) is H1, H1<=5mm, pole (300) includes the column main part (310) and ring edge (320), the column main part (310) is worn and is equipped with the first through -hole (110) and second through -hole (210), the ring edge (320) is located the outer circumferential surface of column main part (310) and extends along the circumference of column main part (310), and the ring edge (320) is located in the first recess (220) and stops and reaches the bottom wall of first recess (220). The side edge is tangent to the second through -hole (210). The multiple side edges include multiple straight edges (221) and multiple transition edges (222), the multiple straight edges (221) and the multiple transition edges (222) are alternately arranged along the circumference of the second through -hole (210), the minimum distance between the straight edge (221) and the second through -hole (210) is H1, and the maximum distance between the transition edge (222) and the second through -hole (210) is H2, H1 In the second direction, the size of the column main part (310) is L1, the size of the ring edge (320) is L2, 1<=L2 / L1<=3, and the second direction intersects with the first direction.

2. The roof assembly of claim 1, wherein, One of the multiple transition edges (222) is configured as a straight line, and the remaining transition edges (222) are configured as arc edges.

3. The roof assembly of claim 2, wherein, The top cover (100) is provided with a convex package (120) which protrudes away from the first insulation piece (200), the convex package (120) is provided with a second recess (130) on the side facing the first insulation piece (200), the first insulation piece (200) is provided with a protrusion (240) on the side facing the top cover (100), the protrusion (240) is correspondingly arranged in the first recess (220), and the protrusion (240) is inserted into the second recess (130).

4. The roof assembly of claim 3, wherein, The size of the convex package (120) in the first direction is 0.2mm-2.5mm.

5. The roof assembly of claim 3, wherein, The side wall of the second recess (130) has a flat surface (131) which is perpendicular to the plane of the top cover (100) facing the first insulation piece (200).

6. The roof assembly of claim 1, wherein, The top cover (100) is provided with a sink (140) on the side facing the first insulation piece (200), and the sink (140) is arranged on the side of the flat surface (131) away from the pole (300).

7. The roof assembly of claim 6, wherein, ​ 8. The roof assembly of claim 6, wherein, ​ 9. The roof assembly of claim 8, wherein, ​ The first insulating piece (200) is provided with a sunken platform (230) on one side facing the top cover (100), and the sunken platform (230) is arranged in the sunken groove (140).

10. The roof assembly of claim 9, wherein, The flat surfaces (131) are multiple, and the multiple flat surfaces (131) are arranged in a circumferential direction of the second groove (130) at intervals. The sunken grooves (140) are multiple, and the multiple sunken grooves (140) and the multiple flat surfaces (131) are arranged in a one-to-one correspondence. The sunken platforms (230) are multiple, and the multiple sunken platforms (230) are arranged in the sunken grooves (140) in a one-to-one correspondence.

11. The roof assembly of claim 1, wherein, The pole column (300) further comprises a flange (330), which is arranged at one end of the pole column body (310) away from the ring edge (320), and extends along the outer circumferential surface of the pole column body (310). The top cover assembly (1) further comprises a second insulating piece (400), which is arranged between the top cover (100) and the pole column (300), and comprises a first ring portion (410), a second ring portion (420), a third ring portion (430) and a lug (440). The first ring portion (410) and the third ring portion (430) are both connected with the second ring portion (420), the flange (330) is abutted on one side of the second ring portion (420) away from the first insulating piece (200), the first ring portion (410) surrounds the flange (330), the third ring portion (430) surrounds the pole column body (310), and the lug (440) is arranged on the outer circumferential surface of the first ring portion (410).

12. The roof assembly of claim 11, wherein, The lugs (440) are two, and the two lugs (440) are located on opposite sides in a radial direction of the second insulating piece (400).

13. The roof assembly of claim 11, wherein, The top cover (100) is provided with a positioning groove (150) on one side away from the first insulating piece (200), and the lugs (440) are located in the positioning groove (150).

14. The roof assembly of claim 11, wherein, The central angle of the lugs (440) is 3°-25°; and / or The size of the lugs (440) in the first direction is D1, the size of the flange (330) in the first direction is D2, and 0.8≤D1 / D2≤5; and / or The radius of the inner circumferential surface of the third ring portion (430) is R1, the minimum distance between the outer circumferential surface of the lug (440) and the center of the third ring portion (430) in the radial direction of the second insulating piece (400) is R2, and 1 15. The roof assembly of claim 11, wherein, A gasket (500) is arranged between one side of the second ring portion (420) away from the first insulating piece (200) and the flange (330), and the yield strength of the gasket (500) is greater than or equal to 150Mpa.

16. The roof assembly of claim 15, wherein, The material of the gasket (500) is aluminum or aluminum alloy.

17. A battery, characterized by It comprises: A shell (2) is provided with an opening and a receiving cavity (5), and the opening communicates with the receiving cavity (5); An electrode core (4) is arranged in the receiving cavity (5) and comprises a tab. The top cover assembly (1) according to any one of claims 1-16, the top cover (100) is connected with the shell (2) and covers the opening, the first insulating piece (200) is located on the side of the top cover (100) facing the accommodating cavity (5), and the pole column (300) is connected with the pole lug.

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