Top cover, battery and electric device

Abstract

The utility model discloses a top cover, a battery and a power utilization device, and relates to the technical field of batteries, the top cover comprises a top cover plate, a connecting assembly and a pole terminal arranged on the top cover plate; the top cover plate is provided with a pole hole; the pole terminal is positioned on the first side of the top cover plate in the thickness direction of the top cover plate; the connecting assembly comprises a pole and a connecting piece, the pole is arranged on the connecting piece, and the connecting piece is located on the second side of the top cover plate in the thickness direction of the top cover plate; wherein the pole is arranged in the pole hole, the outer diameter of the pole is smaller than the inner diameter of the pole hole, and the pole is electrically connected with the pole terminal. According to the top cover, through the split type design of the pole terminal and the connecting assembly, the component assembling difficulty of the top cover is reduced, meanwhile, the electric connection between the battery cell tab and the connecting piece is facilitated, the space occupied by the tab is reduced, and the energy density is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a top cover, a battery and an electrical device. Background Art

[0002] In the field of battery technology, the top cover, as an important component of the battery assembly, plays a key role in protecting the battery cell and achieving electrical connections. With the development of portable electronic devices and the electric vehicle industry, the requirements for battery performance are getting higher and higher, such as the energy density of the battery.

[0003] The battery top cover in the prior art usually adopts an integrated pole terminal design, which has the problems of difficult assembly and low efficiency during the welding process of the battery cell tab and the connecting piece. At the same time, the integrated pole terminal occupies a lot of space inside the shell, limiting the further improvement of the battery energy density. In addition, the complex pole structure also increases the complexity and cost of battery manufacturing, which is not conducive to the large-scale production and application of batteries. Utility Model Content

[0004] The purpose of the present application is to provide a top cover, which reduces the difficulty of assembling the components of the top cover through the split design of the pole terminal and the connecting assembly, and facilitates the electrical connection between the battery cell tab and the connecting sheet, reduces the space occupied by the tab, and improves the energy density. Another purpose of the present application is to provide a battery and an electrical device.

[0005] To achieve the above-mentioned purpose, the present application provides a top cover, comprising a top cover plate, a connection assembly, and a pole terminal arranged on the top cover plate;

[0006] The top cover plate is provided with a pole hole;

[0007] The pole terminal is located on a first side of the top cover plate in the thickness direction of the top cover plate;

[0008] The connection assembly comprises a pole and a connection plate, the pole is arranged on the connection plate, and the connection plate is located on the second side of the top cover plate in the thickness direction of the top cover plate;

[0009] The pole is arranged in the pole hole, the outer diameter of the pole is smaller than the inner diameter of the pole hole, and the pole is electrically connected to the pole terminal.

[0010] In some embodiments, the first side of the top cover plate is provided with an annular protrusion surrounding the pole hole, the pole terminal is arranged inside the annular protrusion, and the pole terminal is fixedly connected to the annular protrusion.

[0011] In some embodiments, an annular groove is disposed outside the annular protrusion.

[0012] In some embodiments, the interior of the pole terminal is hollow, the pole is disposed inside the pole terminal, and the pole is electrically connected to the pole terminal.

[0013] In some embodiments, the top cover further comprises an insulating member disposed on the second side of the top cover plate; the thickness of the insulating member is 0.4 mm to 5.0 mm, and / or the insulating member is provided with a through hole corresponding to the pole hole; and / or,

[0014] The top cover also includes a sealing ring arranged in the pole hole, and the sealing ring plays a sealing role between the pole terminal and the top cover plate.

[0015] In some embodiments, the pole terminal includes a pressure ring, a plastic part and a fixing ring, the plastic part is located between the pressure ring and the fixing ring, the part of the pressure ring extending toward the fixing ring is embedded in the plastic part, and the part of the fixing ring extending toward the pressure ring is embedded in the plastic part.

[0016] In some embodiments, the pole terminal further includes a mounting ring, and the mounting ring is nested in the inner circumference of the fixing ring.

[0017] In some embodiments, the top cover plate is provided with an annular protrusion, an annular sink is provided on the inner side of the upper surface of the annular protrusion, the annular sink positions the pole terminal in the thickness direction of the top cover plate, and the pressure ring is fixedly connected to the annular protrusion.

[0018] In some embodiments, the projections of the pressure ring and the fixing ring, and the projections of the mounting ring and the fixing ring in the height direction have overlapping areas; and / or,

[0019] The upper surface of the mounting ring is lower than the fixing ring.

[0020] In some embodiments, the relationship between the height H and thickness L of the annular protrusion and the thickness H1 of the top cover plate includes: H / L≥1, 0.3mm≤L≤H1, L≥0.6mm.

[0021] In some embodiments, the relationship among the height H of the annular protrusion, the inner diameter L1 of the annular protrusion and the thickness H1 of the top cover plate includes: 0.3mm≤H≤L1 / 2-H1≤10mm, 1mm≤H1≤10mm.

[0022] In some embodiments, the relationship between the width w and the depth H2 of the annular groove includes: w≥0.3mm, 0.05mm≤H2≤0.5mm.

[0023] In some embodiments, the top cover plate is provided with an annular protrusion, the distance between the upper surface of the annular protrusion and the upper surface of the pressure ring is less than 0.5mm, the upper surface of the annular protrusion is welded to the upper surface of the pressure ring, and the relationship between the fusion depth h1 and the fusion width w1, and the thickness H4 of the upper and lower surfaces of the pressure ring includes: h1≥0.3H4, 0.2mm≤h1≤1.5mm, 0.2mm≤w1≤1.5mm.

[0024] In some embodiments, the top cover plate is provided with an annular protrusion and an annular groove located on the outer periphery of the annular protrusion, and the relationship between the thickness H4 of the upper and lower surfaces of the pressure ring, the horizontal wall thickness L4, the distance L5 between the outer periphery of the plastic part and the outer periphery of the pressure ring, and the width w of the annular groove includes: 0.2L4≤L5≤0.8L4, L5≥w.

[0025] In some embodiments, the upper surface of the fixing ring is not lower than the upper surface of the pressing ring and the relationship of the distance h includes: h≥0.2mm.

[0026] In some embodiments, the upper surface of the mounting ring is lower than the fixing ring and the relationship between the distance h and the distance d1 between the upper surface of the mounting ring and the lower surface of the mounting ring includes: 0.1≤h≤3mm, d1>0.8mm.

[0027] In some embodiments, the relationship between the distance L2 between the outer diameter surface of the fixing ring and the inner wall surface of the annular protrusion and the distance L3 between the lower surface of the fixing ring and the annular sink includes: L2≥0.3mm, 0.2mm≤L3≤1mm.

[0028] The present application also provides a battery, comprising the above-mentioned top cover, wherein the top cover is provided with a liquid injection hole.

[0029] The present application also provides an electrical device, comprising the above-mentioned battery.

[0030] Compared with the above-mentioned background technology, the top cover provided in the present application mainly includes a top cover plate, a connecting assembly, and a pole terminal arranged on the top cover plate; the top cover plate is provided with a pole hole; the pole terminal is located on the first side of the top cover plate in the thickness direction of the top cover plate; the connecting assembly includes a pole and a connecting piece, the pole is arranged on the connecting piece, and the connecting piece is located on the second side of the top cover plate in the thickness direction of the top cover plate; wherein, the pole is arranged in the pole hole, the outer diameter of the pole is smaller than the inner diameter of the pole hole, and the pole is electrically connected to the pole terminal.

[0031] In the field of battery technology, top cover design plays a key role in improving battery performance. In traditional battery top covers, the assembly of pole terminals and connecting components is often complicated. In addition, the folded pole ears take up space, and the pole terminals with an integrated design take up the internal space of the shell, which limits the improvement of battery energy density. In response to these technical problems, the top cover design proposed in this application adopts a split structure to assemble the pole terminals and connecting components separately. This design significantly reduces the difficulty of assembly, because the pole terminals can be directly fixed on the top cover plate, and the connecting components can be electrically connected to the pole terminals independently. The split design simplifies the assembly process, reduces errors and rework during assembly, and thus improves production efficiency.

[0032] In addition, the connecting piece is electrically connected to the cell tab, saving the space occupied by the tab folding. Due to the separation of the pole terminal and the connecting assembly, the pole can be designed to pass through the pole hole on the top cover plate and be electrically connected to the pole terminal. This penetration design minimizes the space occupied by the tab, leaving more space for the battery cell, which helps to improve the energy density of the battery. The outer diameter of the pole is smaller than the inner diameter of the pole hole, ensuring that the fit between the pole and the pole hole is both stable and allows appropriate thermal expansion, thereby ensuring the reliability of the long-term operation of the battery.

[0033] Combined with the above structure and process description, it can be seen that the top cover has at least the following beneficial effects: the top cover reduces the difficulty of assembling the components of the top cover through the split design of the pole terminal and the connecting assembly, and at the same time facilitates the electrical connection between the battery cell tabs and the connecting sheets, reduces the space occupied by the tabs, and improves the energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application 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 described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of a battery provided in accordance with an embodiment of the present application;

[0036] Figure 2 A schematic diagram of a battery provided in another embodiment of the present application;

[0037] Figure 3 An exploded view of the top cover provided in an embodiment of the present application;

[0038] Figure 4 A cross-sectional view of a top cover provided in an embodiment of the present application;

[0039] Figure 5An exploded view of a first terminal provided in an embodiment of the present application;

[0040] Figure 6 An exploded view of a second terminal provided in an embodiment of the present application;

[0041] Figure 7 Dimensional drawing of the top cover plate provided for the embodiment of the present application;

[0042] Figure 8 A dimensional diagram of the first terminal and the top cover plate provided in an embodiment of the present application;

[0043] Fig. 9 A dimension diagram of a first terminal provided in an embodiment of the present application;

[0044] Fig.10 A dimension diagram of the pressure ring provided in the embodiment of the present application;

[0045] Fig.11 A dimension diagram of a first terminal and a pole provided in an embodiment of the present application;

[0046] Fig.12 Another dimension diagram of the first terminal and the top cover plate provided in the application embodiment.

[0047] in:

[0048] Top cover 1, top cover plate 11, pole hole 111, annular protrusion 112, annular groove 113, annular sink 114, pole terminal 12, pressure ring 121, first groove 1211, plastic part 122, first inner convex 1221, second outer convex 1222, fixing ring 123, second groove 1231, mounting ring 124, connecting assembly 13, pole 131, connecting piece 132, insulating part 14, through hole 141, sealing ring 15, explosion-proof valve 16, injection hole 17,

[0049] Shell 2,

[0050] Battery 3,

[0051] Battery 100. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0054] In the attached Figures 1 to 12 In the figure, the coordinate axes are marked, and the directions indicated by the coordinate axes are consistent with the directions described in the present application. The coordinate axis x represents the second direction, which is also the length direction and the left-right direction. The coordinate axis y represents the third direction, which is also the width direction and the front-back direction. The coordinate axis z represents the first direction, which is also the height direction, the thickness direction, and the up-down direction. Therefore, the height and thickness referred to in the present application are the dimensions in the first direction. In addition, the radial direction referred to in the present application is the direction perpendicular to the first direction.

[0055] Please refer to Figure 1 and Figure 2 , Figure 1 A schematic diagram of a battery provided in one embodiment of the present application, Figure 2 A schematic diagram of a battery provided in accordance with another embodiment of the present application.

[0056] like Figure 1 and Figure 2 As shown, the battery 100 mainly includes a top cover 1 , a shell 2 and a battery cell 3 . Figure 1 and Figure 2 Two different forms of battery 100 are given, Figure 1 The middle battery 100 has poles arranged on opposite sides. Figure 2 The poles are arranged on the same side, and the top cover 1 provided by the present application can be applied to any form of battery 100. In addition, the top cover 1 provided by the present application is applicable to batteries 100 of different structures such as square, blade and cylinder, which should also belong to the description scope of the present application.

[0057] The top cover 1 includes a top cover plate 11, a connecting assembly 13, and a pole terminal 12 arranged on the top cover plate 11; the top cover plate 11 is provided with a pole hole 111; the pole terminal 12 is located on a first side of the top cover plate 11 in the thickness direction of the top cover plate 11; the connecting assembly 13 includes a pole 131 and a connecting piece 132, the pole 131 is arranged on the connecting piece 132, and the connecting piece 132 is located on a second side of the top cover plate 11 in the thickness direction of the top cover plate 11; wherein the pole 131 is arranged in the pole hole 111, the outer diameter of the pole 131 is smaller than the inner diameter of the pole hole 111, and the pole 131 is electrically connected to the pole terminal 12.

[0058] like Figure 1As shown, the coordinate axis z in the figure represents the first direction, which is also the thickness direction of the top cover plate 11. For the top cover 1 on the left side of the figure, the pole terminal 12 is located on the first side of the top cover plate 11, corresponding to the left side of the figure, and the connecting piece 132 is located on the second side of the top cover plate 11, corresponding to the right side of the figure. For the top cover 1 on the right side of the figure, the pole terminal 12 is located on the first side of the top cover plate 11, corresponding to the right side of the figure, and the connecting piece 132 is located on the second side of the top cover plate 11, corresponding to the left side of the figure.

[0059] like Figure 2 As shown, the coordinate axis z in the figure represents the first direction, which is also the thickness direction of the top cover plate 11. The pole terminal 12 is located on the first side of the top cover plate 11, corresponding to the upper side shown in the figure, and the connecting piece 132 is located on the second side of the top cover plate 11, corresponding to the lower side shown in the figure. The shell 2 serves as the external structure of the battery 100, accommodating and protecting the internal battery cells 3. The battery cells 3 are the energy storage units of the battery. The number of battery cells 3 is not limited. The connecting assembly 13 can be connected to the pole ears of multiple battery cells 3 at the same time, and there can be multiple parallel configurations to meet different voltage and capacity requirements. Preferably, the number of battery cells 3 is two.

[0060] In the field of battery technology, the design of the top cover 1 plays a key role in improving battery performance. In traditional battery top covers, the assembly of the pole terminal 12 and the connecting assembly 13 is often complicated. In addition, the folding of the pole ear takes up space, and the pole terminal with an integrated design occupies the internal space of the shell 2, which limits the improvement of the battery energy density. In response to these technical problems, the top cover 1 proposed in this application adopts a split structure to assemble the pole terminal 12 and the connecting assembly 13 separately. This design significantly reduces the difficulty of assembly, because the pole terminal 12 can be directly fixed on the top cover plate 11, and the connecting assembly 13 can be independently electrically connected to the pole terminal 12. The split design simplifies the assembly process, reduces errors and rework during assembly, and thus improves production efficiency.

[0061] In addition, the connecting piece 132 is electrically connected to the tab of the battery cell 3, saving the space occupied by the tab folding. Due to the separation of the pole terminal 12 and the connecting assembly 13, the pole 131 can be designed to pass through the pole hole 111 on the top cover plate 11 and be electrically connected to the pole terminal 12. This penetrating design minimizes the space occupied by the tab, thereby leaving more space for the battery cell 3 and helping to improve the energy density of the battery. The outer diameter of the pole 131 is smaller than the inner diameter of the pole hole 111, ensuring that the fit between the pole 131 and the pole hole 111 is both stable and allows appropriate thermal expansion, thereby ensuring the reliability of the long-term operation of the battery.

[0062] Combined with the above structure and process description, it can be seen that the top cover 1 has at least the following beneficial effects: the top cover 1 reduces the difficulty of assembling the components in the top cover 1 through the split design of the pole terminal 12 and the connecting assembly 13, and at the same time facilitates the electrical connection between the pole ear of the battery cell 3 and the connecting piece 132, thereby reducing the space occupied by the pole ear and improving the energy density.

[0063] It should be noted that this embodiment only limits the outer diameter of the pole 131 to be smaller than the inner diameter of the pole hole 111, and does not limit the structural shape of the pole 131 and the pole hole 111. For example, the structural shape of the pole 131 and the pole hole 111 can be any shape such as round, square, elliptical, etc., which should fall within the scope of the description of this application.

[0064] It should be emphasized that, since the battery cell 3 in the prior art is in a horizontal state when it is electrically connected to the connecting piece 132, the battery cell 3 is adjusted to a vertical state after the tabs of the battery cell 3 are electrically connected to the connecting piece 132, which causes the tabs of the battery cell 3 to be bent and folded multiple times, so the tabs of the battery cell 3 occupy space, which is not conducive to improving the energy density of the battery. Compared with this, the present application adopts the top cover 1 of the present application, the tabs are laid flat, and the laid part is arranged in the reserved space. Compared with the traditional folding tab method, the reserved space saves internal space. The present application can directly connect and fix the tabs of the battery cell 3 to the connecting piece 132, and then assemble the connecting assembly 13 and the pole terminal 12, which simplifies the assembly process, reduces the occupation of the tabs by the internal space of the shell 2, and improves the energy density of the battery.

[0065] Optionally, after the connecting piece 132 and the pole 131 are assembled into one, the connecting piece 132 is welded to the pole ear of the battery cell 3, and the pole 131 is then welded to the pole terminal 12, thereby achieving welding after the cores are assembled, reducing the difficulty of the process.

[0066] The following will Figure 2 For example, please refer to the battery 100 in FIG. Figure 3 , Figure 3 An exploded view of the top cover provided in an embodiment of the present application.

[0067] like Figure 3 As shown, the top cover 1 includes a top cover plate 11 and two sets of pole terminals 12 arranged on the top cover plate 11, and each set of pole terminals 12 is correspondingly installed with a set of connecting components 13, corresponding to the first set of pole terminals 12 and their connecting components 13 on the left side of the figure, and the second set of pole terminals 12 and their connecting components 13 on the right side of the figure.

[0068] In some cases, the first set of pole terminals 12 and their connection components 13 can be regarded as first terminals, and the second set of pole terminals 12 and their connection components 13 can be regarded as second terminals. The first terminals and the second terminals can have the same or different components.

[0069] Please continue to refer to Figure 3 In some cases, the top cover 1 further includes an explosion-proof valve 16 and a liquid injection hole 17 disposed on the top cover plate 11, and an insulating member 14 disposed between the top cover plate 11 and the battery cell 3. The explosion-proof valve 16 can provide protection when the internal pressure of the battery increases abnormally. The liquid injection hole 17 is used to inject electrolyte during the battery manufacturing process.

[0070] The insulating member 14 can be made of a plastic structure, such as injection molding on the second side of the top cover plate 11. The insulating member 14 has an insulating function, and the insulating member 14 is provided with a through hole 141, which corresponds to the pole hole 111, so that the pole 131 passes through the insulating member 14 and the pole hole 111 and is welded and fixed to the pole terminal 12. In the height direction, the projection area of ​​the explosion-proof valve 16 is hollowed out, so that the gas inside the battery cell can be quickly discharged after the explosion-proof valve 16 is opened. Among them, the height direction corresponds to the coordinate axis z shown in the figure.

[0071] In some cases, the top cover 1 further includes a sealing ring 15 disposed in the pole hole 111 , and the sealing ring 15 serves to seal between the pole terminal 12 and the top cover plate 11 .

[0072] Please refer to Figure 4 , Figure 4 A cross-sectional view of a top cover provided in an embodiment of the present application.

[0073] In some embodiments, a first side of the top cover plate 11 is provided with an annular protrusion 112 surrounding the pole hole 111 , the pole terminal 12 is disposed inside the annular protrusion 112 , and the pole terminal 12 is fixedly connected to the annular protrusion 112 .

[0074] In this embodiment, the annular protrusion 112 is an annular convex structure, which facilitates the welding connection between the pole terminal 12 and the top cover plate 11 and enhances the structural strength.

[0075] In some embodiments, an annular groove 113 is disposed outside the annular protrusion 112 .

[0076] Specifically, the annular protrusion 112 is located on the first side surface of the top cover plate 11. By providing an annular groove 113 outside the annular protrusion 112 on the upper surface of the top cover plate 11, it is possible to prevent metal wires from being generated between the root of the annular protrusion 112 and the surface of the top cover plate 11, thereby reducing the process difficulty and improving the product appearance.

[0077] In some embodiments, an annular depression 114 is disposed inside the upper surface of the annular protrusion 112, the annular depression 114 positions the pole terminal 12 in the thickness direction of the top cover plate 11, and the pressure ring 121 is fixedly connected to the annular protrusion 112. The thickness direction corresponds to the coordinate axis z shown in the figure.

[0078] In this embodiment, the annular countersunk platform 114 limits the axial position of the pole terminal 12, and the annular protrusion 112 limits the radial position of the pole terminal 12. By forming the annular countersunk platform 114 inside the annular protrusion 112, such a structural design provides a stable support for the pole terminal 12. The presence of the annular countersunk platform 114 enhances the connection strength between the pole terminal 12 and the top cover plate 11. At the same time, the fixed connection between the pressure ring 121 and the annular protrusion 112 ensures the stable positioning of the pole terminal 12. Through precise positioning and stable support, it helps to improve the overall performance and durability of the battery. In addition, this structure also facilitates the installation and welding process of the pole terminal 12, further improving the production efficiency and consistency of the battery.

[0079] In some embodiments, the interior of the pole terminal 12 is hollow, the pole 131 is disposed inside the pole terminal 12 , and the pole 131 is electrically connected to the pole terminal 12 .

[0080] It should be noted that the pole terminal 12 adopts a hollow structure design. On the one hand, the advantage of the hollow design is that it reduces product weight, reduces costs, and improves energy density. On the other hand, the pole terminal 12 is inserted into the pole 131 in the connecting component 13 for fixed connection.

[0081] During installation, after the connecting piece 132 and the pole 131 are assembled into one, the connecting piece 132 is welded and fixed to the pole ear of the battery cell 3, the pole hole 111 of the top cover 1 is equipped with a sealing ring 15, the pole terminal 12 is assembled in the annular protrusion 112 of the top cover 1, and the lower surface of the pole terminal 12 presses the sealing ring 15, and the pole terminal 12 is welded and fixed to the annular protrusion 112 of the top cover 1; the pole 131 of the connecting assembly 13 passes through the sealing ring 15 in the pole hole 111 and is assembled with the inner hole of the pole terminal 12 and welded and fixed.

[0082] In some embodiments, the pole terminal 12 includes a pressure ring 121, a plastic part 122 and a fixing ring 123, the plastic part 122 is located between the pressure ring 121 and the fixing ring 123, the pressure ring 121 is partially embedded in the plastic part 122, and the fixing ring 123 is partially embedded in the plastic part 122. In some cases, the second terminal adopts a solution in which the pole terminal 12 includes a pressure ring 121, a plastic part 122 and a fixing ring 123.

[0083] Please refer to Figure 6 , Figure 6This is an exploded view of the second terminal provided in an embodiment of the present application.

[0084] For the second terminal, the pressure ring 121 is used to be fixedly connected to the annular protrusion 112, the plastic part 122 is located between the pressure ring 121 and the fixing ring 123, the part of the pressure ring 121 extending toward the fixing ring 123 is embedded in the plastic part 122, the fixing ring 123 is wrapped around the inner side of the plastic part 122, and the fixing ring 123 is used to be fixedly connected to the pole 131.

[0085] During installation, after the connecting piece 132 and the pole 131 are assembled into one, the connecting piece 132 is welded and fixed to the pole ear of the battery cell 3, the pole hole 111 of the top cover 1 is equipped with a sealing ring 15, the pole terminal 12 is assembled in the annular protrusion 112 of the top cover 1, and the lower surface of the fixing ring 123 of the pole terminal 12 presses the sealing ring 15, and the protruding part of the sealing ring 15 is placed in the pole hole 111 for positioning, so that the pole terminal 12 and the top cover plate 11 are insulated from each other, and the pressing ring 121 of the pole terminal 12 is welded and fixed to the annular protrusion 112 of the top cover 1; the pole 131 of the connecting assembly 13 passes through the sealing ring 15 in the pole hole 111 and is assembled with the inner hole of the fixing ring 123 of the pole terminal 12 and welded and fixed.

[0086] In a specific implementation, the second terminal can be used as a positive terminal, and in this case, the pole 131 connected to the second terminal is a positive pole.

[0087] Optionally, the fixing ring 123 and the pressing ring 121 are made of aluminum. In addition, the connecting piece 132 is made of aluminum.

[0088] In some embodiments, the pole terminal 12 further includes a mounting ring 124 , which is nested in the inner circumference of the fixing ring 123 .

[0089] In some cases, the first terminal adopts a solution in which the pole terminal 12 includes a pressing ring 121 , a plastic part 122 , a fixing ring 123 and a mounting ring 124 .

[0090] Please refer to Figure 5 , Figure 5 This is an exploded view of the first terminal provided in an embodiment of the present application.

[0091] For the first terminal, the pressing ring 121 is used to be fixedly connected to the annular protrusion 112, the plastic part 122 is located between the pressing ring 121 and the fixing ring 123, and the pressing ring 121 is embedded in the outer side of the plastic part 122, the fixing ring 123 is wrapped in the inner side of the plastic part 122, and the mounting ring 124 is nested in the inner side of the fixing ring 123, and the mounting ring 124 is used to be fixedly connected to the pole 131.

[0092] During installation, after the connecting piece 132 and the pole 131 are assembled into one, the connecting piece 132 is welded and fixed to the pole ear of the battery cell 3, the pole hole 111 of the top cover 1 is equipped with a sealing ring 15, the pole terminal 12 is assembled in the annular protrusion 112 of the top cover 1, and the lower surface of the mounting ring 124 of the pole terminal 12 presses the sealing ring 15, and the protruding part of the sealing ring 15 is placed in the pole hole 111 for positioning, so that the pole terminal 12 and the top cover plate 11 are insulated from each other, and the pressing ring 121 of the pole terminal 12 is welded and fixed to the annular protrusion 112 of the top cover 1; the pole 131 of the connecting assembly 13 passes through the sealing ring 15 in the pole hole 111 and is assembled with the mounting ring 124 of the pole terminal 12 and welded and fixed.

[0093] In this embodiment, in addition to the scheme of compounding the pressure ring 121 and the fixing ring 123 into a whole through the injection molding process, the mounting ring 124 and the fixing ring 123 are nested, and the fixing ring 123 is sleeved on the outside of the mounting ring 124. At this time, the wall surfaces of the fixing ring 123 and the mounting ring 124 are tightly fitted, and at the same time, the fixing ring 123 and the mounting ring 124 are abutted by a step. This design is not only convenient for installation and positioning, but also effectively improves the current flow capacity by increasing the contact area.

[0094] In a specific implementation, the first terminal can be used as a negative terminal, and in this case, the pole 131 connected to the first terminal is a negative pole.

[0095] Optionally, the fixing ring 123 and the pressing ring 121 are made of aluminum, and the mounting ring 124 is made of copper. In addition, the connecting piece 132 is made of aluminum.

[0096] In this embodiment, the mounting ring 124 is made of copper. The high electrical conductivity and thermal conductivity of copper help improve the charging and discharging efficiency and heat dissipation capacity of the battery. The light weight and corrosion resistance of aluminum help reduce the weight of the battery and improve durability. In addition, the cost of aluminum is lower than that of copper, which helps to reduce the overall production cost. In addition, the fixing ring 123 can also provide a sufficiently large busbar welding area without significantly increasing the material cost. This nested arrangement of the fixing ring 123 and the mounting ring 124 simplifies the welding process and reduces the assembly cost.

[0097] In addition, the mounting ring 124 and the fixing ring 123 may also be made in one piece, which is equivalent to an integral fixing ring 123. The fixing ring 123 is made in one piece in the form of a copper-aluminum composite plate, which should also belong to the description scope of this application.

[0098] Please continue to refer to Figure 5 and Figure 6In some embodiments, a first groove 1211 is provided on the inner circumference of the pressure ring 121 , a second groove 1231 is provided on the outer circumference of the fixing ring 123 , and the plastic part 122 is provided with a second outer convex bump 1222 corresponding to the first groove 1211 and a first inner convex bump 1221 corresponding to the second groove 1231 .

[0099] In this embodiment, the first groove 121 is combined with the second outer convex bump 1222 to achieve anti-rotation positioning of the pressure ring 121 on the plastic part 122, and the second groove 1231 is combined with the first inner convex bump 1221 to achieve anti-rotation positioning of the fixing ring 123 on the plastic part 122.

[0100] Please refer to Figure 7 , Figure 7 A dimensional drawing of the top cover plate provided in an embodiment of the present application.

[0101] The relationship between the height H and thickness L of the annular protrusion 112 and the thickness H1 of the top cover plate 11 includes: H / L≥1, 0.3mm≤L≤H1, L≥0.6mm.

[0102] Preferably, 0.6 mm≤L≤1.5 mm, so as to ensure the structural strength of the annular protrusion 112 and achieve sufficient penetration depth and width when welding with the pressure ring 121 , thereby ensuring the structural strength between the pole terminal 12 and the top cover plate 11 .

[0103] The relationship between the height H of the annular protrusion 112, the inner diameter L1 of the annular protrusion 112 and the thickness H1 of the top cover plate 11 includes: 0.3mm≤H≤L1 / 2-H1≤10mm, 1mm≤H1≤10mm. Such a size design facilitates the machinability of the material near the pole hole 111 and is conducive to mass production.

[0104] Preferably, 0.5mm≤H≤5mm, and the height H is the distance from the annular protrusion 112 to the upper surface of the top cover plate 11, which provides sufficient mechanical strength for the annular protrusion 112, while ensuring the depth and width of welding during the welding process, thereby ensuring the structural strength between the pole terminal 12 and the top cover plate 11.

[0105] In some embodiments, the relationship between the width w and the depth H2 of the annular groove 113 includes: w ≥ 0.3 mm, 0.05 mm ≤ H2 ≤ 0.5 mm. Preventing the generation of metal wires between the root of the annular protrusion 112 and the surface of the top cover plate 11 is conducive to reducing the difficulty of the process and improving the appearance of the product. Among them, the width refers to the dimension in the radial direction perpendicular to the first direction.

[0106] In some embodiments, the projections of the pressing ring 121 and the fixing ring 123, and the mounting ring 124 and the fixing ring 123 in the height direction all have overlapping areas, thereby ensuring the strength between the pole terminal 12 and the top cover plate 11 and improving the safety of the battery 100. The height direction corresponds to the coordinate axis z shown in the figure.

[0107] Please refer to Figure 8 , Figure 8 Dimensional drawing of the first terminal and the top cover plate provided in an embodiment of the present application.

[0108] The relationship between the distance L2 between the second outer diameter surface of the fixing ring 123 and the inner wall surface of the annular protrusion 112 and the distance L3 between the lower surface of the fixing ring 123 and the annular sink 114 includes: L2≥0.3mm, 0.2mm≤L3≤1mm.

[0109] Preferably, 0.4mm≤L2≤1.0mm, L3≥0.2mm, to ensure the insulation effect and reduce the process difficulty; L3≤1mm, to reduce the height of the pole 131, reduce the cost and improve the energy density.

[0110] Please refer to Fig. 9 , Fig. 9 A dimensional diagram of the first terminal provided in an embodiment of the present application.

[0111] In some embodiments, the upper surface of the mounting ring 124 is lower than the fixing ring 123 .

[0112] The upper surface of the mounting ring 124 is lower than the fixing ring 123 and the relationship between the distance h and the distance d1 between the upper surface of the mounting ring 124 and the lower surface of the mounting ring 123 includes: 0.1≤h≤3mm, d1>0.8mm.

[0113] Preferably, 0.2mm≤h≤1mm to ensure structural strength.

[0114] Please refer to Fig.10 , Fig.10 A dimensional diagram of the pressure ring provided in an embodiment of the present application.

[0115] The relationship among the thickness H4 of the upper and lower surfaces of the pressing ring 121 , the horizontal wall thickness L4 , the distance L5 between the outer periphery of the plastic part 122 and the outer periphery of the pressing ring 121 , and the width w of the annular groove 113 includes: 0.2L4≤L5≤0.8L4, L5≥w.

[0116] The connection strength between the pressing ring 121 and the fixing ring 123 is ensured to prevent the plastic part 122 from affecting the welding and fixing of the pressing ring 121 and the annular protrusion 112 .

[0117] The upper surface of the fixing ring 123 is not lower than the upper surface of the pressing ring 121 and the distance h includes: h≥0.2 mm.

[0118] Preferably, 0.3 mm ≤ h ≤ 1.5 mm, so as to avoid affecting the welding between the pole terminal 12 and the busbar, and to avoid affecting the insulation between the busbar and the top cover plate 11 .

[0119] The distance between the upper surface of the annular protrusion 112 and the upper surface of the pressure ring 121 is less than 0.5mm, the upper surface of the annular protrusion 112 is welded to the upper surface of the pressure ring 121, and the relationship between the fusion depth h1 and the fusion width w1, and the thickness H4 of the upper and lower surfaces of the pressure ring 121 includes: h1≥0.3H4, 0.2mm≤h1≤1.5mm, 0.2mm≤w1≤1.5mm.

[0120] Preferably, the upper surface of the annular protrusion 112 and the upper surface of the pressure ring 121 are located in the same plane, and the absolute value of the distance is less than 0.2 mm. The penetration depth h1 and the penetration width w1 ensure the welding strength and reduce the welding heat affected zone.

[0121] Please refer to Fig.11 , Fig.11 This is a dimensional diagram of the first terminal and the pole provided in an embodiment of the present application.

[0122] After the connecting piece 132 is welded and fixed to the pole lug of the battery cell 3 , the pole 131 is inserted into the pole hole 111 , and the pole 131 is welded and fixed to the pole terminal 12 , and the relationship between the weld depth h2 and the weld width w2 includes: 0.2mm≤h2≤2mm, 0.3mm≤w2≤1.5mm.

[0123] The distance h3 between the upper surface of the mounting ring 124 and the upper surface of the pole 131 is ≤0.6 mm, so as to improve the welding yield. The upper surface of the pole 131 is not higher than the upper surface of the fixing ring 123 .

[0124] The thickness of the plastic part 122 is H3, and the thickness of the thinnest area is H3min≥0.2mm, which ensures the insulation performance and reduces the difficulty of the injection molding process.

[0125] Please refer to Fig.12 , Fig.12 Another dimension diagram of the first terminal and the top cover plate provided in the application embodiment.

[0126] The height of the annular platform 114 is not less than the outer diameter thickness H4 of the pressure ring 121. To ensure the strength of the annular protrusion 112, the mouth thickness L6 of the annular protrusion 112 is greater than half of the thickness of the annular protrusion 112, that is, L6>H / 2, to ensure the strength of the annular protrusion 112 and the strength of the welding between the pressure ring 121 and the mouth of the annular protrusion 112.

[0127] After the connecting piece 132 is welded and fixed to the battery cell 3, the pole 131 is inserted into the pole hole 111, and the pole 131 is welded and fixed to the pole terminal 12. The relationship between the fusion depth h3 and the fusion width w3 includes: 0.2mm≤h3≤2mm, preferably, 0.3mm≤h3≤1mm, which ensures the strength and stability of the welded joint, 0.3mm≤w3≤1.5mm, preferably, 0.5mm≤w3≤1mm, which helps to improve the thermal cycle capacity of the welding area and reduce welding stress, thereby improving the quality and reliability of the welded joint.

[0128] The upper surface of the fixing ring 123 and the upper surface of the pole 131 are in the same plane, and the relationship of the distance h4 includes: h4≤0.6mm, which improves the welding yield, and the upper surface of the pole 131 is not higher than the upper surface of the fixing ring 123.

[0129] The thickness of the insulating member 14 ranges from 0.4 to 5.0 mm, which is convenient for processing and manufacturing, while saving the internal space of the housing 2, preferably 0.6 to 2.0 mm. After the winding core (battery core 3) and the connecting piece 132 are welded, the winding core and the connecting piece 132 are wrapped with mylar (Mylar, a biaxially oriented polyester film), which serves as insulation between the winding core and the top cover plate 11. At the same time, because the thickness of the insulating member 14 is 0.6 to 2.0 mm, the height of the winding core can be increased, and the capacity can also be increased; the winding core wrapped with mylar is welded and fixed to the pole terminal 12 of the top cover 1, and an electrical connection is achieved.

[0130] The present application also provides a battery 100, including the top cover 1, the top cover 1 is provided with an explosion-proof valve 16 and a liquid injection hole 17, specifically, the explosion-proof valve 16 and the liquid injection hole 17 are arranged on the top cover plate 11. The battery 100 should have all the beneficial effects of the top cover 1, which will not be described one by one here.

[0131] The present application also provides an electrical device, including the above-mentioned battery 100. The design of the electrical device can be energy storage application or power output, or the two application modes can be compatible, which should all fall within the scope of the description of the present application.

[0132] In addition, the electrical device should have all the beneficial effects of the above-mentioned top cover 1, which will not be described in detail here.

[0133] It should be noted that many of the components mentioned in this application are universal standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or through conventional experimental methods.

[0134] 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.

[0135] The top cover, battery and electrical device provided by the present application are introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A top cover, characterized in that: It includes a top cover plate, a connection assembly, and a pole terminal arranged on the top cover plate; The top cover plate is provided with a pole hole; The pole terminal is located on a first side of the top cover plate in the thickness direction of the top cover plate; The connection assembly comprises a pole and a connection plate, the pole is arranged on the connection plate, and the connection plate is located on the second side of the top cover plate in the thickness direction of the top cover plate; The pole is arranged in the pole hole, the outer diameter of the pole is smaller than the inner diameter of the pole hole, and the pole is electrically connected to the pole terminal.

2. The top cover according to claim 1, characterized in that: An annular protrusion surrounding the pole hole is provided on the first side of the top cover plate, the pole terminal is arranged inside the annular protrusion, and the pole terminal is fixedly connected to the annular protrusion.

3. The top cover according to claim 2, characterized in that: An annular groove is arranged outside the annular protrusion.

4. The top cover according to claim 1, characterized in that: The pole terminal is hollow inside, the pole is arranged inside the pole terminal, and the pole is electrically connected to the pole terminal.

5. The top cover according to claim 1, characterized in that: The top cover further comprises an insulating member arranged on the second side of the top cover plate; the thickness of the insulating member is 0.4 mm to 5.0 mm, and / or the insulating member is provided with a through hole corresponding to the pole hole; and / or, The top cover also includes a sealing ring arranged in the pole hole.

6. The top cover according to claim 1, characterized in that: The pole terminal includes a pressing ring, a plastic part and a fixing ring, wherein the plastic part is located between the pressing ring and the fixing ring, a part of the pressing ring extending toward the fixing ring is embedded in the plastic part, and a part of the fixing ring extending toward the pressing ring is embedded in the plastic part.

7. The top cover according to claim 6, characterized in that: The pole terminal further includes a mounting ring, which is nested in the inner circumference of the fixing ring.

8. The top cover according to claim 6 or 7, characterized in that: The top cover plate is provided with an annular protrusion, an annular sink is provided inside the upper surface of the annular protrusion, the annular sink positions the pole terminal in the thickness direction of the top cover plate, and the pressure ring is fixedly connected to the annular protrusion.

9. The top cover according to claim 7, characterized in that: The projections of the pressing ring and the fixing ring, and the projections of the mounting ring and the fixing ring in the height direction all have overlapping areas; and / or, The upper surface of the mounting ring is lower than the fixing ring.

10. The top cover according to claim 2, characterized in that: The relationship between the height H and thickness L of the annular protrusion and the thickness H1 of the top cover plate includes: H / L≥1, 0.3mm≤L≤H1, L≥0.6mm.

11. The top cover according to claim 2, characterized in that: The relationship among the height H of the annular protrusion, the inner diameter L1 of the annular protrusion and the thickness H1 of the top cover plate includes: 0.3mm≤H≤L1 / 2-H1≤10mm, 1mm≤H1≤10mm.

12. The top cover according to claim 3, characterized in that: The relationship between the width w and the depth H2 of the annular groove includes: w≥0.3mm, 0.05mm≤H2≤0.5mm.

13. The top cover according to claim 6 or 7, characterized in that: The top cover plate is provided with an annular protrusion, the distance between the upper surface of the annular protrusion and the upper surface of the pressure ring is less than 0.5mm, the upper surface of the annular protrusion is welded to the upper surface of the pressure ring, and the relationship between the fusion depth h1 and the fusion width w1, and the thickness H4 of the upper and lower surfaces of the pressure ring includes: h1≥0.3H4, 0.2mm≤h1≤1.5mm, 0.2mm≤w1≤1.5mm.

14. The top cover according to claim 6 or 7, characterized in that: The top cover plate is provided with an annular protrusion and an annular groove located on the outer periphery of the annular protrusion. The relationship between the thickness H4 of the upper and lower surfaces of the pressure ring, the horizontal wall thickness L4, the distance L5 between the outer periphery of the plastic part and the outer periphery of the pressure ring, and the width w of the annular groove includes: 0.2L4≤L5≤0.8L4, L5≥w.

15. The top cover according to claim 6 or 7, characterized in that: The upper surface of the fixing ring is not lower than the upper surface of the pressing ring and the distance h includes: h≥0.2mm.

16. The top cover according to claim 7, characterized in that: The upper surface of the mounting ring is lower than the fixing ring, and the relationship between the distance h and the distance d1 between the upper surface of the mounting ring and the lower surface of the mounting ring includes: 0.1≤h≤3mm, d1>0.8mm.

17. The top cover according to claim 8, characterized in that: The relationship between the distance L2 between the outer diameter surface of the fixing ring and the inner wall surface of the annular protrusion and the distance L3 between the lower surface of the fixing ring and the annular sink includes: L2≥0.3mm, 0.2mm≤L3≤1mm.

18. A battery, characterized in that: It comprises the top cover according to any one of claims 1 to 17, wherein the top cover is provided with a liquid injection hole.

19. An electrical device, characterized in that: Comprising the battery of claim 18.

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