Top cover and battery

Abstract

The utility model discloses a top cover and a battery. The top cover comprises a top cover plate and a connecting piece arranged on one side of the top cover plate, the top cover plate is provided with a pole terminal and a pole hole, the hole edge of the pole hole protrudes to form a fixing part, the fixing part at least partially wraps the pole terminal, and the pole hole fixes the pole terminal by adopting a protruding wrapping structure, so that only part of the pole terminal is sunk into the top cover plate, and therefore, materials can be saved; at least one of the pole terminal and the terminal contact of the connecting piece protrudes in the opposite direction and extends into the pole hole until the pole terminal and the terminal contact are in contact and conducted, the weight can be reduced, manufacturing materials can be saved, and the design requirements for light weight and low cost are met at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover and a battery. Background Art

[0002] Against the backdrop of global energy conservation, emission reduction and sustainable development, the replacement of fossil energy with new energy has become a popular demand. Currently, new energy technologies have been widely used in the fields of automobiles, heavy trucks, agricultural drones, power tools, etc.

[0003] New energy batteries are divided into two categories: energy storage batteries and power batteries. Energy storage lithium batteries have the advantages of higher capacity, lower self-discharge rate and longer cycle life, and are mainly used in solar power generation equipment, wind power generation equipment and batteries for storing energy from renewable energy. Power batteries have the advantages of high energy density, long cycle life, no memory effect and environmental friendliness, and are widely used in plug-in hybrid electric vehicles, hybrid electric vehicles, pure electric vehicles and other scenarios that require frequent charging and discharging, and are more popular.

[0004] At present, power batteries usually include a top cover plate and a battery cell. The top cover plate is parallel to the top of the battery cell, and the top cover plate and the battery cell are electrically connected through the pole terminal. The pole terminal is a columnar structure that penetrates the top cover plate and extends out of the top cover plate and is welded to the battery cell. However, this columnar pole terminal consumes more materials and is heavy, which makes it difficult to meet the design requirements of lightweight and low cost. Utility Model Content

[0005] The utility model aims to provide a top cover and a battery, which solves the technical problem that the existing batteries are difficult to meet the design requirements of light weight and low cost.

[0006] To achieve the above-mentioned purpose, the utility model provides a top cover, including a top cover plate and a connecting piece arranged on one side of the top cover plate; the top cover plate is provided with a pole terminal, the top cover plate is provided with a pole hole, the hole edge of the pole hole is protruded to form a fixing portion, and the fixing portion is at least partially wrapped around the outside of the pole terminal; at least one of the terminal contacts of the pole terminal and the connecting piece protrudes in opposite directions and extends into the pole hole until the two are in contact and conductive.

[0007] Preferably, at least one of the pole terminal and the terminal contact is formed with a protrusion extending in opposite directions; the pole hole also includes a limiting portion abutting against the bottom end of the pole terminal, and the limiting portion is formed with a clearance through hole for the protrusion to pass through.

[0008] Preferably, the pole terminal includes a terminal body and a plastic sleeve at least partially wrapped around the terminal body, an insulating pad is provided between the top cover plate and the connecting piece; a sealing ring is provided between the relief through hole and the protrusion, and the sealing ring is respectively against the plastic sleeve, the terminal body and the limiting portion.

[0009] Preferably, the pole terminal further comprises a pressing ring fixed between the plastic sleeve and the fixing portion; a limiting step is formed on the outer side surface of the plastic sleeve, and the limiting step abuts against the end surface of the pressing ring.

[0010] Preferably, the protrusion is a hollow convex structure formed on the terminal contact; the terminal body includes a first terminal body, and the first terminal body is a solid structure that abuts against the end face of the protrusion.

[0011] Preferably, the first terminal body comprises a first fixing ring, the first fixing ring is fixedly arranged inside the plastic sleeve, and the end surface of the first fixing ring abuts against the end surface of the protrusion;

[0012] And / or, the first terminal body includes a first fixing ring and a first pole, the first fixing ring is fixed on the inner side of the plastic sleeve, and the first pole is coaxially embedded in a fixing through hole set in the center of the first fixing ring; the first pole includes a stacked copper sheet and an aluminum sheet, and the copper sheet or the aluminum sheet is against the raised end face.

[0013] Preferably, the outer side surface of the first fixing ring is provided with a limiting flange, and the limiting flange matches with the limiting ring groove of the plastic sleeve.

[0014] Preferably, the terminal body, the top cover sheet, the first fixing ring, the plastic sleeve and the sealing ring satisfy a first corresponding preset relationship, and the first corresponding preset relationship is: H2+H3-H4-H5≤H, wherein H is the thickness of the terminal body, in mm; H1 is the height of the fixing part, in mm; H2≥1mm, H2 is the thickness of the first fixing ring, in mm; H3≥0.1mm, H3 is the thickness of the plastic sleeve, in mm; H4≥0.2mm, H4 is the thickness of the sealing ring, in mm; H5≥0, H5 is the contact height between the first fixing ring and the first pole, in mm.

[0015] Preferably, the terminal contact, the pole terminal and the first pole satisfy a second corresponding preset relationship, and the second corresponding preset relationship is S1 / S2≥0.1, wherein S1 is the contact area between the terminal contact and the pole terminal, and the unit is ; S2 is the maximum cross-sectional area of ​​the first pole, unit ;

[0016] Or, the first pole, the connecting piece and the first fixing ring satisfy a third corresponding preset relationship, and the third corresponding preset relationship is S2 / S3≥0.03 or S4 / S3≤0.8; wherein S2 is the maximum cross-sectional area of ​​the first pole, in units of ; S3 is the surface area of ​​the connecting piece, unit ; S4 is the maximum cross-sectional area of ​​the first fixing ring, unit .

[0017] Preferably, the protrusion is a hollow convex structure formed on the terminal contact; the terminal body includes a second terminal body, and the second terminal body is a solid structure with one end abutting against the protrusion and the other end forming a columnar recessed groove.

[0018] Preferably, the second terminal body comprises a second fixing ring, which is arranged inside the plastic sleeve, one end of the second fixing ring is formed with a columnar recessed groove and the other end abuts against the end surface of the protrusion;

[0019] And / or, the second terminal body includes a second fixing ring and a second pole, the second fixing ring is fixed on the inner side of the plastic sleeve, one end of the second fixing ring is provided with a circular through hole and the other end is provided with a fixing groove, the second pole is coaxially fixed in the fixing groove, one end of the second pole is provided with a recessed groove and the other end is abutted against the raised end face; the circular through hole and the recessed groove are coaxially connected to form a columnar recessed groove.

[0020] Preferably, the protrusion is a hollow convex structure formed on the terminal contact and having a plug-in hole in the center; the terminal body includes a third terminal body, which is a stepped structure having a plug-in protrusion formed at one end for plugging into the plug-in hole and a stepped groove formed at the other end.

[0021] Preferably, the third terminal body comprises a third fixing ring, which is fixedly arranged inside the plastic sleeve, and one end of the third fixing ring is formed with a stepped recess and the other end is formed with a plug-in protrusion plug-connected to the plug-in through hole of the protrusion;

[0022] And / or, the third terminal body includes a third fixing ring and a third pole, the third fixing ring is fixed on the inner side of the plastic sleeve, one end of the third fixing ring is provided with a through hole and the other end is provided with a clamping groove, the third pole is coaxially clamped in the clamping groove, one end of the third pole is provided with a step groove and the other end is provided with a plug-in protrusion which is plug-inly connected to the raised plug-in through hole; the through hole and the step groove are coaxially connected to form a step groove.

[0023] Preferably, the protrusion is a stepped convex structure formed on the terminal contact and having a docking protrusion formed on the end surface; the terminal body includes a fourth terminal body, and the fourth terminal body is a hollow structure provided with a docking through hole plugged into the docking protrusion.

[0024] Preferably, the fourth terminal body comprises a fourth fixing ring, a docking through hole is formed at the center of the fourth fixing ring, and the docking through hole and the docking protrusion are plugged and abutted against each other;

[0025] And / or, the fourth terminal body includes a fourth fixing ring and a fourth pole, the fourth fixing ring is fixed on the inner side of the plastic sleeve, one end of the fourth fixing ring is provided with a straight through hole and the other end is provided with an embedding groove, the fourth pole is coaxially fixed in the embedding groove, and a docking through hole is formed in the center of the fourth pole, and the docking through hole is plug-connected to the docking protrusion.

[0026] Preferably, the protrusion is formed on the pole terminal, and the terminal contact is a planar structure; the protrusion is a hollow convex structure formed on the terminal body and abutting against the terminal contact; the terminal body includes a fifth terminal body, and the fifth terminal body is a hollow stepped structure with a cylindrical groove formed at one end and the other end abutting against the terminal contact.

[0027] Preferably, the fifth terminal body comprises a fifth fixing ring, which is fixedly arranged inside the plastic sleeve and has a protrusion formed at one end thereof to abut against the terminal contact;

[0028] And / or, the fifth terminal body includes a fifth fixing ring and a fifth pole, the fifth fixing ring is fixed on the inner side of the plastic sleeve, one end of the fifth fixing ring is provided with a through hole and the other end is provided with a fixing groove, the fifth pole is coaxially fixed in the fixing groove, the fifth pole is stepped and the end face is formed with a protrusion that abuts against the terminal contact.

[0029] Preferably, the ratio of the contact area between the pole terminal and the connecting piece to the cross-sectional area of ​​the pole terminal is greater than or equal to 0.1; and / or the ratio of the projected overlapping area between the pole terminal and the connecting piece is between 0.03 and 0.8; and / or the height ratio between the terminal contact and the pole terminal is greater than or equal to 0.3.

[0030] The utility model also provides a battery, comprising a bare cell and the above-mentioned top cover, wherein the bare cell is fixedly provided with a plurality of pole ears, and all the pole ears are electrically connected with the connecting piece of the top cover.

[0031] Preferably, the invention further comprises a shell, and the top cover is welded to the opening of the shell.

[0032] Compared with the background technology, the utility model optimizes the connection method between the top cover plate and the pole terminal and between the pole terminal and the connecting piece. The optimized top cover plate is provided with a pole hole, and the hole edge of the pole hole is protruded to form a fixing portion, that is, the pole hole adopts a protruding wrapping structure to fix the pole terminal, so that the pole terminal is only partially immersed in the top cover plate, which can save materials; moreover, at least one of the terminal contacts of the optimized pole terminal and the connecting piece protrudes in relative directions and extends into the pole hole until the two are in contact and conductive, which can reduce the thickness of the pole terminal and / or the terminal contact, which can not only reduce the weight but also save manufacturing materials, so as to meet the design requirements of lightweight and low cost.

[0033] The battery provided by the utility model comprises a bare cell and the above-mentioned top cover, wherein the bare cell is fixedly provided with a plurality of pole ears, and all the pole ears are electrically connected with the connecting piece of the top cover, and have the same beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0035] Figure 1 An axonometric view of a battery equipped with a top cover provided in a first specific embodiment of the utility model;

[0036] Figure 2 for Figure 1 Exploded diagram of

[0037] Figure 3 for Figure 1 Exploded view of the middle top cover, connecting piece and pole terminal;

[0038] Figure 4 for Figure 1 A longitudinal section diagram of the middle top cover plate, connecting piece and pole terminal after assembly;

[0039] Figure 5 for Figure 1 Another longitudinal section diagram of the middle top cover plate, the connecting piece and the pole terminal after assembly;

[0040] Figure 6 for Figure 1 The assembly cross-sectional view of the middle top cover, negative pole terminal and bare battery cell;

[0041] Figure 7 for Figure 6 A partial enlarged view of middle A;

[0042] Figure 8 for Figure 1 Assembly cross-sectional view of the middle top cover, positive pole terminal and bare battery cell;

[0043] Fig. 9 for Figure 1 Structural diagram of the middle connecting piece;

[0044] Fig.10 for Figure 1 Schematic diagram of the relevant thickness of the middle top cover plate, negative pole terminal and connecting piece;

[0045] Fig.11 for Figure 1 Schematic diagram of the relevant thickness of the middle top cover plate, positive pole terminal and connecting piece;

[0046] Fig.12 for Figure 1 Schematic diagram of the relevant areas of the middle top cover plate, negative pole terminal and connecting piece;

[0047] Fig.13 for Figure 1 Structural diagram of the middle top cover;

[0048] Fig.14 for Figure 1 Schematic diagram of the device of the middle shell, bare battery cell and connecting piece;

[0049] Fig.15 for Fig.14 A transverse cross-sectional view of

[0050] Fig.16 It is a longitudinal cross-sectional schematic diagram of the top cover plate, the connecting piece and the pole terminal after being assembled in the second specific embodiment of the utility model;

[0051] Fig.17 Another longitudinal sectional view of the second specific embodiment of the utility model after the top cover plate, the connecting piece and the pole terminal are assembled;

[0052] Fig.18 It is an assembly cross-sectional view of the top cover plate, the negative electrode terminal and the bare battery cell in the second specific embodiment of the utility model;

[0053] Fig.19 for Fig.18 A partial enlarged view of B in the middle;

[0054] Fig. 20 It is an assembly cross-sectional view of the top cover plate, the positive electrode terminal and the bare battery cell in the second specific embodiment of the utility model;

[0055] Fig.21 This is a structural diagram of a connecting piece in a second specific embodiment of the utility model;

[0056] Fig. 22 This is an exploded view of the terminal body in the second specific embodiment of the utility model;

[0057] Fig.23 It is a longitudinal cross-sectional schematic diagram of the top cover plate, the connecting piece and the pole terminal after being assembled in the third specific embodiment of the utility model;

[0058] Fig.24 Another longitudinal sectional view of the top cover plate, the connecting piece and the pole terminal after being assembled in the third specific embodiment of the utility model;

[0059] Fig.25 It is an assembly cross-sectional view of the top cover plate, the negative electrode terminal and the bare battery cell in the third specific embodiment of the utility model;

[0060] Fig.26 for Fig.25 A partial enlarged view of middle C;

[0061] Fig. 27It is an assembly cross-sectional view of the top cover plate, the positive electrode terminal and the bare battery cell in the third specific embodiment of the utility model;

[0062] Fig.28 This is a structural diagram of a connecting piece in a third specific embodiment of the utility model;

[0063] Fig.29 It is a longitudinal cross-sectional schematic diagram of the top cover plate, the connecting piece and the pole terminal after being assembled in the fourth specific embodiment of the utility model;

[0064] Fig.30 Another longitudinal sectional view of the fourth specific embodiment of the utility model after the top cover plate, the connecting piece and the pole terminal are assembled;

[0065] Fig.31 It is an assembly cross-sectional view of the top cover plate, the negative electrode terminal and the bare battery cell in the fourth specific embodiment of the utility model;

[0066] Fig.32 for Fig.31 A partial enlarged view of D in the middle;

[0067] Fig.33 It is an assembly cross-sectional view of the top cover plate, the positive electrode terminal and the bare battery cell in the fourth specific embodiment of the utility model;

[0068] Fig.34 This is a structural diagram of a connecting piece in a fourth specific embodiment of the utility model;

[0069] Fig.35 It is a longitudinal sectional schematic diagram of the top cover plate, the connecting piece and the pole terminal after being assembled in the fifth specific embodiment of the utility model;

[0070] Fig.36 Another longitudinal sectional view of the top cover plate, the connecting piece and the pole terminal after being assembled in the fifth specific embodiment of the utility model;

[0071] Fig.37 It is an assembly cross-sectional view of the top cover plate, the negative electrode terminal and the bare battery cell in the fifth specific embodiment of the utility model;

[0072] Fig.38 for Fig.37 A partial enlarged view of middle E;

[0073] Fig.39 This is an assembly cross-sectional view of the top cover plate, the positive electrode terminal and the bare battery cell in the fifth specific embodiment of the utility model;

[0074] Fig.40 This is a structural diagram of a connecting piece in a fifth specific embodiment of the utility model;

[0075] Fig.41A schematic diagram of another battery provided by the utility model with a top cover;

[0076] Fig.42 for Fig.41 Exploded diagram.

[0077] The reference numerals are as follows:

[0078] 10-top cover plate, 20-bare battery cell, 30-connecting piece, 40-pole terminal, 50-protrusion, 60-insulating pad, 7-0 sealing ring, 80-housing and 90-explosion-proof valve;

[0079] 101-pole hole, 102-stop groove;

[0080] 1011-fixing portion, 1012-limiting portion, 1013-displacing through hole and 1014-annular sink groove;

[0081] 201-ear;

[0082] 2011-connecting part, 2012-gathering part and 2013-root;

[0083] 301-terminal contact;

[0084] 400-terminal body, 401-plastic sleeve and 402-pressing ring;

[0085] 4011-limiting step, 4012-annular boss and 4013-limiting ring groove;

[0086] 4021-pressure ring gap

[0087] 411-First terminal body;

[0088] 4111-first fixing ring and 4112-first pole;

[0089] 41111-limiting flange;

[0090] 421 - second terminal body and 422 - columnar sink;

[0091] 4211-second fixing ring and 4212-second pole;

[0092] 42111-Fixed ring gap;

[0093] 42121-Pole gap;

[0094] 431-third terminal body, 432-plugging protrusion and 433-stepped sink groove;

[0095] 501-plug through hole;

[0096] 4311-third fixing ring and 4312-third pole;

[0097] 441-fourth terminal body and 442-butting through hole;

[0098] 502- docking protrusion;

[0099] 4411-fourth fixing ring and 4412-fourth pole;

[0100] 451 - fifth terminal body and 452 - cylindrical groove;

[0101] 4511-fifth fixing ring and 4512-fifth pole;

[0102] 601-limiting boss;

[0103] 701-convex ring portion and 702-flange portion;

[0104] 901-Protective film. DETAILED DESCRIPTION

[0105] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0106] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0107] The utility model embodiment discloses a top cover, as shown in the attached Figures 1 to 5 As shown, the top cover includes a top cover plate 10 and a connecting piece 30 provided on one side of the top cover plate 10 and electrically connected to the bare battery cell 20. The top cover plate 10 is provided with an explosion-proof valve 90 hole, the explosion-proof valve 90 is fixedly provided in the explosion-proof valve 90 hole, and a protective film 901 is provided outside the explosion-proof valve 90, wherein the protective film 901 is used to protect the explosion-proof valve 90 from foreign matter entering, puncturing or dirtying the explosion-proof valve 90, thereby affecting the life of the explosion-proof valve 90 and avoiding safety impact.

[0108] As attached Figure 3 and 13As shown, the top cover plate 10 is provided with a pole terminal 40, and the top cover plate 10 is provided with a pole hole 101. The hole edge of the pole hole 101 is protruded to form a fixing portion 1011, and the fixing portion 1011 at least partially wraps the pole terminal 40. The pole hole 101 adopts a protruding wrapping structure to fix the pole terminal. The pole terminal 40 cooperates with the hole axis of the fixing portion 1011, so that the pole terminal 40 is only partially sunken into the top cover plate 10, which can reduce the space of the pole terminal 40 in the shell 80. This can save materials, reduce costs, and at the same time improve the space utilization of the top cover plate 10 and improve the energy density of the battery. Among them, the fixing portion 1011 is cylindrical, of course not limited to this, the structure of the fixing portion 1011 is determined by the structure of the pole terminal 40, the pole terminal 40 can be square or round, and the fixing portion 1011 can also be square or round accordingly. Specifically, the pole terminal 40 includes two types: a negative pole terminal and a positive pole terminal.

[0109] The connecting piece 30 is provided with a terminal contact 301, and each pole terminal 40 abuts against each terminal contact 301. Each terminal contact 301 can be a convex structure or a flat structure. The pole terminal 40 and the connecting piece 30 are fixedly connected by welding to ensure that the pole terminal 40 and the connecting piece 30 have good connection strength and current carrying capacity.

[0110] As attached Figure 6 and 8 As shown, at least one of the pole terminal 40 and the terminal contact 301 protrudes in opposite directions and extends into the pole hole 101 until the two are in contact and conductive, which can reduce the thickness of the pole terminal 40 and / or the terminal contact 301, thereby reducing weight and saving manufacturing materials, so as to meet the design requirements of lightweight and low cost.

[0111] As attached Figure 6 and 8 As shown, at least one of the pole terminal 40 and the terminal contact 301 is formed with a protrusion 50 extending in opposite directions. The arrangement of the protrusion 50 can reduce the thickness of the pole terminal 40 and / or the terminal contact 301, achieve weight reduction and material saving, so as to meet the design requirements of lightweight and low cost; in addition, the arrangement of the protrusion 50 can also improve the space utilization rate inside the housing 80 and improve the energy density of the battery. As a preferred embodiment, the protrusion 50 is a hollow structure, which saves more materials and can better meet the design requirements of lightweight and low cost.

[0112] As attached Figure 3 and 13As shown, the pole hole 101 also includes a stopper 1012 that abuts against the bottom end of the pole terminal 40. The stopper 1012 is in a circular ring shape, which is a preferred embodiment, but is not limited thereto. The central axes of the fixing portion 1011 and the stopper 1012 coincide. The stopper 1012 is formed with a clearance through hole 1013 for the protrusion 50 to pass through, so that the pole terminal 40 can be designed to be thin.

[0113] As attached Figures 6 to 8 As shown, the pole terminal 40 includes a terminal body 400 and a plastic sleeve 401 at least partially wrapped around the terminal body 400. The terminal body 400 is preferably made of aluminum, copper, copper-aluminum composite material, etc. The plastic sleeve 401 is used to separate the terminal body 400 from the top cover plate 10. The wrapped design of the plastic sleeve 401 can enable the pole terminal 40 to realize modular design using the injection molding process, so as to reduce the manufacturing cost and improve the production efficiency by reducing the difficulty of assembly. In addition, when the pole terminal 40 is a positive terminal, the plastic sleeve 401 is a conductive part. When the pole terminal 40 is a negative terminal, the plastic sleeve 401 is an insulating part. In this way, the insulating sleeve 401 can maintain good insulation performance between the top cover plate 10 and the pole terminal 40, so as to avoid leakage of the top cover plate 10 and affect the safety of the battery.

[0114] An insulating pad 60 is provided between the top cover plate 10 and the connecting piece 30 to separate the top cover plate 10 and the connecting piece 30 so as to maintain good insulation performance between the top cover plate 10 and the connecting piece 30, further avoid leakage of the top cover plate 10, and improve the safety of the battery. The plastic sleeve 401 and the insulating pad 60 are both plastic parts. In order to prevent the insulating pad 60 from moving freely between the top cover plate 10 and the bare battery cell 20, a limiting boss 601 is provided on the side of the insulating pad 60 facing the top cover plate 10. The limiting boss 601 cooperates with the stop groove 102 provided at the bottom of the top cover plate 10 to limit the movement of the insulating pad 60 relative to the top cover plate 10.

[0115] As attached Figures 6 to 8As shown, a sealing ring 70 is fixed in the clearance through hole 1013, and the sealing ring 70 includes a convex ring portion 701 and a flange portion 702 that are distributed in a stepped manner. As an embodiment, the convex ring portion 701 is cylindrical and its length is equal to the depth of the clearance through hole 1013. As another embodiment, the length of the convex ring portion 701 is less than the depth of the clearance through hole 1013. Preferably, the length of the convex ring portion 701 is ≥ three quarters of the depth of the clearance through hole 1013. The convex ring portion 701 is in contact with the gap between the through hole 1013 and the protrusion 50. The convex ring portion 701 is in a circular ring shape. The outer side surface of the flange portion 702 is in contact with the plastic sleeve 401 and the two ends are in contact with the end surface of the terminal body 400 and the limiting portion 1012. The sealing ring 70 is usually made of insulating materials such as rubber. On the one hand, it can seal the gap between the pole terminal 40, the top cover plate 10 and the connecting piece 30. On the other hand, it can separate the pole terminal 40, the top cover plate 10 and the connecting piece 30 so that the three have good insulation performance, that is, the sealing ring 70 has both sealing and insulation functions. An annular sink 1014 can be added to the bottom of the pole hole 101 for installing the sealing ring 70, which can reduce the thickness and limit the position of the sealing ring 70.

[0116] It should be noted that if Figure 7 As shown, an annular boss 4012 is formed at the center of the plastic sleeve 401 , and the inner side surface of the annular boss 4012 is a stepped surface, which abuts against the pole terminal 40 and the sealing ring 70 respectively, ensuring good sealing between the plastic sleeve 401 , the sealing ring 70 and the pole terminal 40 .

[0117] As attached Figures 6 to 8 As shown, the pole terminal 40 also includes a pressure ring 402 fixed between the plastic sleeve 401 and the fixing part 1011, and the pressure ring 402 is used to press the terminal body 400 into the pole hole 101 through the plastic sleeve 401 to prevent the pole terminal 400 from rotating in the pole hole 101. The pressure ring 402 can be fixed in the pole hole 101 by welding. A limiting step 4011 is formed on the outer side of the plastic sleeve 401, and the limiting step 4011 abuts against the end face of the pressure ring 402 to limit the position of the pressure ring 402 relative to the plastic sleeve 401. In the radial direction of the pole terminal 40, the inner and outer sides of the pressure ring 402 are respectively embedded in the inner side of the pole hole 101 and the outer side of the plastic sleeve 401 to ensure that the pressure ring 402 is fixed reliably. A pressure ring notch 4021 is provided on the outer side of the pressure ring 402 to ensure that the pressure ring 402 is reliably connected to the plastic sleeve 401.

[0118] In the first specific embodiment, as shown in the attached Fig. 9 As shown, the protrusion 50 is a hollow convex structure formed on the terminal contact 301; Figures 6 to 8 As shown, the terminal body 400 includes a first terminal body 411 , and the first terminal body 411 is a solid structure that abuts against the end surface of the protrusion 50 .

[0119] As shown in the appendix Figure 7 As shown, the first terminal body 411 includes a first fixing ring 4111. The first fixing ring 4111 is fixed inside the plastic sleeve 401, and its end face abuts against the end face of the protrusion 50. The first fixing ring 4111 is welded to the connecting piece 30.

[0120] And / or, as shown in the appendix Figure 6 and 7 As shown, the first terminal body 411 includes a first fixing ring 4111 and a first pole column 4112. The first fixing ring 4111 is fixed inside the plastic sleeve 401, and the first pole column 4112 is coaxially embedded and fixed in the fixing through hole provided at the center of the first fixing ring 4111; the first pole column 4112 includes copper sheets and aluminum sheets stacked from top to bottom, and the aluminum sheet abuts against the end face of the protrusion 50. The first pole column 4112 is composed of a composite material, which can not only reduce the manufacturing cost of the pole column terminal 40, but also improve the electrical conductivity of the pole column terminal 40.

[0121] Limiting flanges 41111 are provided on the outer side surface of the first fixing ring 4111. The limiting flanges 41111 cooperate with the limiting ring groove 4013 of the plastic sleeve 401, so that the first fixing ring 4111 is coaxially fixed in the plastic sleeve 401 in an凹凸嵌合的方式 (it seems there is a missing description here, maybe "concave-convex fitting" way).

[0122] In the first specific embodiment, as shown in the appendix Fig.10 and 11 As shown, the terminal body 400, the top cover piece 10, the first fixing ring 4111, the plastic sleeve 401 and the sealing ring 70 satisfy the first corresponding preset relationship. The first corresponding preset relationship is: H2 + H3 - H4 - H5 ≤ H, where H is the thickness of the terminal body 400, in mm; H1 is the height of the fixing part 1011, in mm; H2 ≥ 1mm, H2 is the thickness of the first fixing ring 4111, in mm; H3 ≥ 0.1mm, H3 is the thickness of the plastic sleeve 401, in mm; H4 ≥ 0.2mm, H4 is the thickness of the sealing ring 70, in mm; H5 ≥ 0, H5 is the contact height between the first fixing ring 4111 and the first pole column 4112, in mm. Preferably, H2 + H3 - H4 - H5 ≤ H < H2, 1mm ≤ H2 ≤ 5mm, 0.3mm ≤ H5 ≤ 5mm, 0.5mm ≤ H3 ≤ 3mm, 0.3mm ≤ H4 ≤ 5mm. In this way, on the premise of ensuring strength, the processing difficulty can be reduced, the weight can be reduced, and the manufacturing cost can be reduced to meet the low-cost setting requirements. When H = H2, the terminal body 400 and the fixing ring are of an integral structure, otherwise they are of a split structure. In addition, in the following four specific embodiments, the dimensions between the terminal body 400, the top cover plate 10, the plastic sleeve 401 and the sealing ring 70 can refer to the first specific embodiment, and will not be elaborated hereinafter.

[0123] In the first specific embodiment, as shown in the attached Fig.11 As shown, the terminal contact 301, the pole terminal 40 and the first pole 4112 satisfy the second corresponding preset relationship, and the second corresponding preset relationship is S1 / S2≥0.1, where S1 is the contact area between the terminal contact 301 and the pole terminal 40, and the unit is ; S2 is the maximum cross-sectional area of ​​the first pole 4112, unit The preferred value is between 0.3 and 0.9, which is convenient for production, ensures the flow area, reduces production costs, and meets low-cost design requirements.

[0124] Or, the first pole 4112, the connecting piece 30 and the first fixing ring 4111 satisfy a third corresponding preset relationship, and the third corresponding preset relationship is S2 / S3≥0.03 or S4 / S3≤0.8; wherein S2 is the maximum cross-sectional area of ​​the first pole 4112, and the unit is ; S3 is the surface area of ​​the connecting piece 30, unit ; S4 is the maximum cross-sectional area of ​​the first fixing ring 4111, that is, the cross-sectional area of ​​the limiting flange 41111, unit ; It is preferably between 0.05 and 0.5 to ensure the flow area and reduce the production cost.

[0125] The optimization scheme in the first specific embodiment of the utility model is mainly reflected in two aspects. First, the terminal contact 301 of the connecting piece 30 is set as a protrusion 50. Second, the first terminal body 411 is set as a composite terminal to meet the design requirements of lightweight and low cost.

[0126] In the second specific embodiment, as shown in the attached Fig.21 As shown, the protrusion 50 is a hollow convex structure formed on the terminal contact 301; Figures 16 to 22 As shown, the terminal body 400 includes a second terminal body 421, which is a solid structure with one end abutting against the protrusion 50 and the other end forming a columnar recessed groove 422. The second terminal body 421 is designed to be thin by providing the columnar recessed groove 422.

[0127] As attached Fig. 20 As shown, the second terminal body 421 includes a second fixing ring 4211 , which is fixed inside the plastic sleeve 401 . A columnar recess 422 is formed at one end of the second fixing ring 4211 and the other end abuts against the end surface of the protrusion 50 .

[0128] and / or, if attached Fig.19As shown, the second terminal body 421 includes a second fixing ring 4211 and a second pole 4212. The second fixing ring 4211 is fixedly arranged inside the plastic sleeve 401. One end of the second fixing ring 4211 is provided with a round through hole and the other end is provided with a fixing groove. The second pole 4212 is coaxially fixed in the fixing groove. The second pole 4212 and the second fixing ring 4211 can be fixedly connected by interference connection, and the second pole 4212 is also pressed and fixed in the fixing groove by the extrusion force applied by the sealing ring 70. The inner diameter of the fixing groove is larger than the inner diameter of the round through hole. The contact surfaces of the second pole 4212 and the sealing ring 70 can be matched with a stepped surface to limit the position of the second pole 4212. One end of the second pole 4212 is provided with a recessed groove and the other end is against the end face of the protrusion 50; the round through hole and the recessed groove are coaxially connected to form a columnar sink 422. The second pole 4212 is a copper pole, but is not limited thereto.

[0129] As attached Fig. 22 As shown, the outer side of the second fixing ring 4211 is provided with a fixing ring notch 42111 to ensure that the second fixing ring 4211 is reliably connected to the plastic sleeve 401. The outer side of the second pole 4212 is provided with a pole notch 42121 to ensure that the second pole 4212 is reliably fixed in the second fixing ring 4211.

[0130] The optimized structure of the second specific embodiment of the utility model is reflected in two aspects: first, the terminal contact 301 of the connecting piece 30 is set as a protrusion 50; second, the pole terminal 40 adopts a columnar sink 422 design to meet the design requirements of light weight and low cost. Compared with the first specific embodiment, the pole terminal 40 is thinner and more material-saving.

[0131] In the third specific embodiment, as shown in the attached Fig.28 As shown, the protrusion 50 is a hollow convex structure formed on the terminal contact 301 and having a plug-in through hole 501 formed in the center; Figures 23 to 27 As shown, the terminal body 400 includes a third terminal body 431 , which is a stepped structure having a plug-in protrusion 432 plug-fitted with the plug-in through hole 501 formed at one end and a stepped recess 433 formed at the other end.

[0132] As attached Fig. 27 As shown, the third terminal body 431 includes a third fixing ring 4311, which is fixed on the inner side of the plastic sleeve 401, and one end of the third fixing ring 4311 is formed with a stepped groove 433 and the other end is formed with a plug-in protrusion 432 that is plug-connected to the plug-in through hole 501 of the protrusion 50.

[0133] and / or, if attached Fig.26As shown, the third terminal body 431 includes a third fixing ring 4311 and a third pole 4312. The third fixing ring 4311 is fixedly arranged inside the plastic sleeve 401. One end of the third fixing ring 4311 is provided with a through hole and the other end is provided with a clamping groove. The third pole 4312 is coaxially clamped in the clamping groove, and the inner diameter of the clamping groove is larger than the inner diameter of the through hole. The fourth pole 4412 can be fixed in the clamping groove by interference connection. One end of the third pole 4312 is provided with a stepped groove and the other end is provided with a plug-in protrusion 432. The plug-in protrusion 432 is plug-connected with the plug-in through hole 501 of the protrusion 50; the through hole and the stepped groove are coaxially connected to form a stepped sink groove 433.

[0134] The third pole 4312 and the connecting piece 30 are connected by welding, and the contact end surfaces of the third pole 4312 and the connecting piece 30 are also connected by welding.

[0135] The optimized structure of the third specific embodiment of the utility model is reflected in two aspects: first, the terminal contact 301 of the connecting piece 30 is set as a protrusion 50 with an opening; second, the pole terminal 40 adopts a stepped sink 433 design to meet the design requirements of light weight and low cost. Compared with the second specific embodiment, the pole terminal 40 saves more materials.

[0136] In the fourth specific embodiment, as shown in the attached Fig.24 As shown, the protrusion 50 is a stepped convex structure formed on the terminal contact 301 and having a mating protrusion 502 formed on the end surface; Figures 29 to 33 As shown, the terminal body 400 includes a fourth terminal body 441 , and the fourth terminal body 441 is a hollow structure plugged into the docking protrusion 502 .

[0137] As attached Fig.33 As shown, the fourth terminal body 441 includes a fourth fixing ring 4411, and a docking through hole 442 is formed at the center of the fourth fixing ring 4411. The small diameter section of the docking through hole 442 is plugged and abutted against the docking protrusion 502. It should be noted that only the small diameter section of the docking through hole 442 is plugged and connected to the docking protrusion 502. The docking through hole 442 has the dual purpose of reducing material and connecting at the same time.

[0138] and / or, if attached Fig.31 and 32As shown, the fourth terminal body 441 includes a fourth fixing ring 4411 and a fourth pole 4412. The fourth fixing ring 4411 is fixedly arranged inside the plastic sleeve 401. One end of the fourth fixing ring 4411 is provided with a straight-through hole and the other end is provided with an embedding groove. The fourth pole 4412 is coaxially fixed in the embedding groove. The inner diameter of the embedding groove is larger than the inner diameter of the straight-through hole. The fourth pole 4412 and the embedding groove are connected by interference fit. A docking through hole 442 is formed at the center of the fourth pole 4412. The docking through hole 442 is stepped. The small diameter section of the docking through hole 442 is plug-connected with the docking protrusion 502.

[0139] The fourth pole 4412 and the connecting piece 30 are connected by welding, and the contact end surfaces of the fourth pole 4412 and the connecting piece 30 are also connected by welding.

[0140] The optimized structure of the fourth specific embodiment of the utility model is reflected in two aspects: first, the terminal contact 301 of the connecting piece 30 is set as a stepped convex structure; second, the pole terminal 40 adopts a hollow design to meet the design requirements of light weight and low cost. Compared with the second specific embodiment, the pole terminal 40 saves more materials.

[0141] In the fifth specific embodiment, as shown in the attached Figures 35 to 39 As shown, the protrusion 50 is formed on the pole terminal 40. Fig.40 As shown, the terminal contact 301 is a planar structure; the protrusion 50 is a hollow convex structure formed on the terminal body 400 and abutting against the terminal contact 301; the terminal body 400 includes a fifth terminal body 451, and the fifth terminal body 451 is a hollow stepped structure with a cylindrical groove 452 formed at one end and the other end abutting against the terminal contact 301.

[0142] As attached Fig.39 As shown, the fifth terminal body 451 includes a fifth fixing ring 4511 . The fifth fixing ring 4511 is fixedly disposed inside the plastic sleeve 401 and has one end formed with a protrusion 50 that abuts against the terminal contact 301 .

[0143] As attached Fig.37 and 38As shown, the fifth terminal body 451 includes a fifth fixing ring 4511 and a fifth pole 4512. The fifth fixing ring 4511 is fixedly arranged on the inner side of the plastic sleeve 401. One end of the fifth fixing ring 4511 is provided with a through hole and the other end is provided with a fixing groove. The fifth pole 4512 is coaxially fixed in the fixing groove. The fifth pole 4512 is stepped and a protrusion 50 is formed on the end surface thereof to abut against the terminal contact 301. Specifically, the fifth pole 4512 includes a flange disk fixedly connected between the sealing ring 70 and the fixing groove and a circular basin body coaxially connected to the flange disk in an integral manner. The diameter of the flange disk is larger than the diameter of the circular basin body, so that the fifth pole 4512 is stepped. A cylindrical cavity is formed at the center of the circular basin body. The cylindrical cavity is coaxially connected with the through hole and the inner diameters of the two are equal.

[0144] The fifth pole 4512 and the connecting piece 30 are connected by welding, and the fifth terminal body 451 and the connecting piece 30 are connected by welding. The contact end surfaces of the fifth pole 4512 and the connecting piece 30 and the contact end surfaces of the fifth terminal body 452 and the connecting piece 30 are also connected by welding.

[0145] The optimized structure of the fifth specific embodiment of the utility model is reflected in two aspects: first, the terminal contact 301 is set as a plane structure, and second, the pole terminal 40 adopts a hollow ladder structure to meet the design requirements of light weight and low cost. Compared with the second specific embodiment, the pole terminal 40 saves more materials and is more convenient to assemble.

[0146] The ratio of the contact area between the pole terminal 40 and the connecting piece 30 to the cross-sectional area of ​​the pole terminal 40 is greater than or equal to 0.1, preferably between 0.35 and 0.9, which is convenient for production and manufacturing, reduces production costs, and ensures that there is sufficient flow area between the pole terminal 40 and the connecting piece 30. And / or, the ratio of the projected overlap area between the pole terminal 40 and the connecting piece 30 is between 0.03 and 0.8, preferably between 0.05 and 0.5, which can also ensure that there is sufficient flow area between the pole terminal 40 and the connecting piece 30, and reduce production costs. And / or, the height ratio between the terminal contact 301 of the connecting piece 30 and the pole terminal 40 is greater than or equal to 0.3, preferably between 0.5 and 0.8, so as to reduce weight and reduce production costs.

[0147] The present utility model also discloses a battery, including a bare cell 20 and the above-mentioned top cover. The bare cell 20 is fixed with a plurality of tabs 201, and all the tabs 201 are electrically connected to the connecting sheet 30 of the top cover. The tabs 201 adopt a folded flat structure, as shown in the attached Fig.15 As shown, it includes a connecting portion 2011, a gathering portion 2012 and a root portion 2013, and the root portion 2013 is conductively connected to the bare battery cell 20. The battery can be a square battery, a blade battery or a cylindrical battery.

[0148] As attached Fig.14 As shown, as an embodiment, the pole terminal 40 includes a positive terminal and a negative terminal, and correspondingly, the tab 201 includes a positive tab and a negative tab that are commonly distributed at one end of the bare cell 20, all the positive tabs are pre-welded together, and the positive tabs are folded and then welded to the connecting sheet 30. Similarly, all the negative tabs are pre-welded together, and the negative tabs are folded and then welded to the connecting sheet 30.

[0149] As attached Fig.41 and 42 As shown, the tabs 201 include a positive tab and a negative tab respectively distributed at the two ends of the bare cell 20 , and a top cover plate 10 and a pole terminal 40 are respectively provided at the two ends of the bare cell 20 .

[0150] In addition to the above, the battery also includes a shell 80, the bare battery cell 20 is installed in the shell 80, and the top cover plate 10 is welded to the open part of the shell 80, which can ensure that the top cover plate 10 and the shell 80 are reliably connected and that there is good sealing between the top cover plate 10 and the shell 80.

[0151] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0152] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A top cover, characterized in that: The invention comprises a top cover plate (10) and a connecting piece (30) arranged on one side of the top cover plate (10); the top cover plate (10) is provided with a pole terminal (40); the top cover plate (10) is provided with a pole hole (101); a fixing portion (1011) is formed protruding along the hole edge of the pole hole (101); the fixing portion (1011) is at least partially wrapped around the outside of the pole terminal (40); at least one of the pole terminal (40) and the terminal contact (301) of the connecting piece (30) protrudes in opposite directions and extends into the pole hole (101) until the two are in contact and conduction.

2. The top cover according to claim 1, characterized in that: At least one of the pole terminal (40) and the terminal contact (301) is formed with a protrusion (50) extending in opposite directions; the pole hole (101) further comprises a limiting portion (1012) abutting against the bottom end of the pole terminal (40), and the limiting portion (1012) is formed with a clearance through hole (1013) for the protrusion (50) to pass through.

3. The top cover according to claim 2, characterized in that: The pole terminal (40) comprises a terminal body (400) and a plastic sleeve (401) at least partially wrapped around the terminal body (400); an insulating pad (60) is provided between the top cover plate (10) and the connecting piece (30); a sealing ring (70) is provided between the clearance through hole (1013) and the protrusion (50); the sealing ring (70) at least abuts against the terminal body (400) and the limiting portion (1012).

4. The top cover according to claim 3, characterized in that: The pole terminal (40) further comprises a pressure ring (402) fixed between the plastic sleeve (401) and the fixing portion (1011); a limiting step (4011) is formed on the outer side surface of the plastic sleeve (401), and the limiting step (4011) abuts against the end surface of the pressure ring (402).

5. The top cover according to claim 3, characterized in that: The protrusion (50) is a hollow convex structure formed on the terminal contact (301); the terminal body (400) comprises a first terminal body (411), and the first terminal body (411) is a solid structure that abuts against the end face of the protrusion (50).

6. The top cover according to claim 5, characterized in that: The first terminal body (411) comprises a first fixing ring (4111), the first fixing ring (4111) being fixedly arranged inside the plastic sleeve (401), and the end surface of the first fixing ring (4111) abuts against the end surface of the protrusion (50); And / or, the first terminal body (411) includes a first fixing ring (4111) and a first pole (4112), the first fixing ring (4111) is fixedly arranged on the inner side of the plastic sleeve (401), and the first pole (4112) is coaxially embedded in a fixing through hole arranged at the center of the first fixing ring (4111); the first pole (4112) includes a copper sheet and an aluminum sheet arranged in a stacked manner, and the copper sheet or the aluminum sheet abuts against the end face of the protrusion (50).

7. The top cover according to claim 6, characterized in that: The outer side surface of the first fixing ring (4111) is provided with a limiting flange (41111), and the limiting flange (41111) cooperates with the limiting ring groove (4013) of the plastic sleeve (401).

8. The top cover according to claim 7, characterized in that: The terminal body (400), the top cover plate (10), the first fixing ring (4111), the plastic sleeve (401) and the sealing ring (70) satisfy a first corresponding preset relationship, and the first corresponding preset relationship is: H2+H3-H4-H5≤H, wherein H is the thickness of the terminal body (400), in mm; H1 is the height of the fixing portion (1011), in mm; H2≥1mm, H2 is the thickness of the first fixing ring (4111), in mm; H3≥0.1mm, H3 is the thickness of the plastic sleeve (401), in mm; H4≥0.2mm, H4 is the thickness of the sealing ring (70), in mm; H5≥0, H5 is the contact height between the first fixing ring (4111) and the first pole (4112), in mm.

9. The top cover according to claim 7, characterized in that: The terminal contact (301), the pole terminal (40) and the first pole (4112) satisfy a second corresponding preset relationship, the second corresponding preset relationship being S1 / S2≥0.1, wherein S1 is a contact area between the terminal contact (301) and the pole terminal (40), in units of mm 2 ; S2 is the maximum cross-sectional area of ​​the first pole (4112), in mm 2 ; Or, a third corresponding preset relationship is satisfied between the first pole (4112), the connecting piece (30) and the first fixing ring (4111), and the third corresponding preset relationship is S2 / S3≥0.03 or S4 / S3≤0.8; wherein S2 is the maximum cross-sectional area of ​​the first pole (4112), in mm 2 ; S3 is the surface area of ​​the connecting piece (30), in mm 2 ; S4 is the maximum cross-sectional area of ​​the first fixing ring (4111), in mm 2 .

10. The top cover according to claim 3, characterized in that: The protrusion (50) is a hollow convex structure formed on the terminal contact (301); the terminal body (400) comprises a second terminal body (421), and the second terminal body (421) is a solid structure with one end abutting against the protrusion (50) and the other end forming a columnar recess (422).

11. The top cover according to claim 10, characterized in that: The second terminal body (421) comprises a second fixing ring (4211), the second fixing ring (4211) being arranged inside the plastic sleeve (401), one end of the second fixing ring being formed with the columnar recess (422) and the other end being abutted against the end surface of the protrusion (50); And / or, the second terminal body (421) comprises a second fixing ring (4211) and a second pole (4212), the second fixing ring (4211) being fixedly arranged on the inner side of the plastic sleeve (401), one end of the second fixing ring (4211) being provided with a round through hole and the other end being provided with a fixing groove, the second pole (4212) being coaxially fixed in the fixing groove, one end of the second pole (4212) being provided with a recessed groove and the other end being abutted against the end face of the protrusion (50); the round through hole and the recessed groove are coaxially connected to form the columnar recessed groove (422).

12. The top cover according to claim 3, characterized in that: The protrusion (50) is a hollow convex structure formed on the terminal contact (301) and having a plug-in through hole (501) formed in the center; the terminal body (400) includes a third terminal body (431), and the third terminal body (431) is a stepped structure having a plug-in protrusion (432) formed at one end for plugging with the plug-in through hole (501) and a stepped recessed groove (433) formed at the other end.

13. The top cover according to claim 12, characterized in that: The third terminal body (431) comprises a third fixing ring (4311), the third fixing ring (4311) is fixedly arranged on the inner side of the plastic sleeve (401), one end of the third fixing ring (4311) is formed with the stepped groove (433) and the other end is formed with a plug-in protrusion (432) plug-connected to the plug-in through hole (501) of the protrusion (50); And / or, the third terminal body (431) comprises a third fixing ring (4311) and a third pole (4312), the third fixing ring (4311) being fixedly arranged on the inner side of the plastic sleeve (401), one end of the third fixing ring (4311) being provided with a through hole and the other end being provided with a clamping groove, the third pole (4312) being coaxially clamped in the clamping groove, one end of the third pole (4312) being provided with a step groove and the other end being provided with a plug-in protrusion (432) plug-connected to the plug-in through hole (501) of the protrusion (50); the through hole and the step groove are coaxially connected to form the step recess (433).

14. The top cover according to claim 3, characterized in that: The protrusion (50) is a stepped convex structure formed on the terminal contact (301) and having a docking protrusion (502) formed on the end surface; the terminal body (400) comprises a fourth terminal body (441), and the fourth terminal body (441) is a hollow structure provided with a docking through hole (442) plugged into the docking protrusion (502).

15. The top cover according to claim 14, characterized in that The fourth terminal body (441) comprises a fourth fixing ring, a docking through hole (442) is formed at the center of the fourth fixing ring, and the docking through hole (442) is plugged into and abutted against the docking protrusion (502); And / or, the fourth terminal body (441) includes a fourth fixing ring (4411) and a fourth pole (4412), the fourth fixing ring (4411) is fixedly arranged on the inner side of the plastic sleeve (401), one end of the fourth fixing ring (4411) is provided with a straight through hole and the other end is provided with an embedding groove, the fourth pole (4412) is coaxially fixed in the embedding groove, and a docking through hole (442) is formed at the center of the fourth pole (4412), and the docking through hole (442) is plug-connected to the docking protrusion (502).

16. The top cover according to claim 3, characterized in that: The protrusion (50) is formed on the pole terminal (40), and the terminal contact (301) is a planar structure; the protrusion (50) is a hollow convex structure formed on the terminal body (400) and abutting against the terminal contact (301); the terminal body (400) includes a fifth terminal body (451), and the fifth terminal body (451) is a hollow stepped structure with a cylindrical groove (452) formed at one end and the other end abutting against the terminal contact (301).

17. The top cover according to claim 16, characterized in that The fifth terminal body (451) comprises a fifth fixing ring, which is fixedly arranged on the inner side of the plastic sleeve (401) and has one end formed with the protrusion (50) that abuts against the terminal contact (301); And / or, the fifth terminal body (451) includes a fifth fixing ring (4511) and a fifth pole (4512), the fifth fixing ring (4511) is fixedly arranged on the inner side of the plastic sleeve (401), one end of the fifth fixing ring (4511) is provided with a through hole and the other end is provided with a fixing groove, the fifth pole (4512) is coaxially fixed in the fixing groove, the fifth pole (4512) is stepped and the end face is formed with the protrusion (50) that abuts against the terminal contact (301).

18. The top cover according to any one of claims 1 to 3, characterized in that: The ratio of the contact area between the pole terminal (40) and the connecting piece (30) to the cross-sectional area of ​​the pole terminal (40) is greater than or equal to 0.1; and / or the ratio of the projected overlapping areas between the pole terminal (40) and the connecting piece (30) is between 0.03 and 0.8; and / or the ratio of the heights between the terminal contact (301) and the pole terminal (40) is greater than or equal to 0.

3.

19. A battery, characterized in that: It comprises a bare battery cell (20) and a top cover according to any one of claims 1 to 18, wherein the bare battery cell (20) is provided with a pole ear (201), and the pole ear (201) is electrically connected to the connecting sheet (30) accordingly.

20. The battery according to claim 19, characterized in that It also includes a shell (80), wherein the top cover is welded to an open portion of the shell (80).

Images