Top cover assembly, battery and electric device

Abstract

The utility model relates to the technical field of energy storage and power devices, and particularly discloses a top cover assembly, a battery and an electric device. The top cover assembly comprises a top cover plate and a pole terminal, wherein the pole terminal comprises a pole, an electric conduction part and a first sealing piece; the pole is arranged on the top cover plate and is provided with a tab through hole; the electric conduction component is welded with the pole, and a formed first welding seam is annular; the first sealing element is annular, the first sealing element is arranged between the electric conduction component and the pole, and the projection of the area surrounded by the first welding seam and the first sealing element on the plane where the top cover plate is located covers the projection of the tab through hole on the plane where the top cover plate is located. According to the top cover assembly, the occupied space for folding the tabs is saved, and the capacity and the energy density of the battery can be improved. And the first welding seam and the first sealing piece of the electric conduction part form double sealing of the electric conduction part between the electric conduction part and the pole, so that the safety of the battery is improved. Therefore, the safety of the battery is ensured, the space occupied by the tabs is reduced, and the capacity of the battery is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage and power device technical field more specifically, relate to a top cap subassembly, battery and electric device. BACKGROUND

[0002] Under the background of global energy saving and emission reduction, sustainable development, new energy replaces fossil energy is the common expectation, at present, new energy technology has been widely used in the field of automobile, heavy truck, agricultural unmanned aerial vehicle, electric tool.

[0003] According to the different functions, power battery has the characteristics such as high energy density, long cycle life, no memory effect and environmental friendliness, is widely used in plug-in hybrid electric vehicle, hybrid electric vehicle, pure electric vehicle. Energy storage battery is mainly used for solar power generation equipment and wind power generation equipment and renewable energy storage battery.

[0004] However, the structure of lithium battery is constantly innovated, and the space utilization rate is rising, how to ensure the safety of the battery while increasing the capacity of the battery is a technical problem to be solved by the technical personnel in the field. UTILITY MODEL CONTENT

[0005] Therefore, the utility model aims at providing a top cap subassembly, battery and electric device, the structural design of the top cap subassembly, battery and electric device can effectively solve the problem of how to ensure the safety of the battery while increasing the capacity of the battery.

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0007] A top cap subassembly, comprising a top cap plate and a pole terminal, the pole terminal comprising:

[0008] Pole, be equipped with the lug through hole of the top cap plate, the pole is equipped with lug through hole;

[0009] Electrically conductive component, with the pole is welded, and the first weld that forms is annular, the projection of the area surrounded by the first weld in the plane where the top cap plate is on covers the projection of the lug through hole in the plane where the top cap plate is on;

[0010] First sealing element, annular, the first sealing element is equipped between the electrically conductive component and the pole, and the projection of the area surrounded by the first sealing element in the plane where the top cap plate is on covers the projection of the lug through hole in the plane where the top cap plate is on.

[0011] Optionally, in the above-mentioned top cap subassembly, the outer edge of the electrically conductive component is welded with the pole, and the first sealing element is arranged on the inner side of the first weld.

[0012] Optionally, in the top cover assembly, the pole post comprises a pole post sink and a first annular protrusion arranged at one end of the pole post sink towards the electrically conductive component, a pole post sink groove is formed between the pole post sink and the first annular protrusion, the tab through hole is arranged in the pole post sink, and the electrically conductive component is arranged in the pole post sink groove and welded with the first annular protrusion.

[0013] Optionally, in the top cover assembly, an annular welding sink is arranged at the edge of the electrically conductive component, the welding sink is flush with the top surface of the first annular protrusion, and the welding sink is welded with the first annular protrusion.

[0014] Optionally, in the top cover assembly, the first sealing member is arranged between the end surface of the electrically conductive component towards the pole post sink and the pole post sink.

[0015] Optionally, in the top cover assembly, the first sealing member is a first sealing ring.

[0016] An annular first sealing groove is arranged at the end surface of the electrically conductive component towards the pole post sink, the first sealing ring is arranged in the first sealing groove, and the depth of the first sealing groove is less than the thickness of the first sealing ring.

[0017] Alternatively, an annular second sealing groove is arranged at the end surface of the pole post sink towards the electrically conductive component, the first sealing ring is arranged in the second sealing groove, and the depth of the second sealing groove is less than the thickness of the first sealing ring.

[0018] Optionally, in the top cover assembly, the pole post comprises:

[0019] a first pole post part, the electrically conductive component is welded with the first pole post part, the first sealing member is arranged between the electrically conductive component and the first pole post part, and the tab through hole is arranged in the first pole post part.

[0020] a second pole post part, arranged at one end of the first pole post part away from the electrically conductive component and sealingly and fixedly connected with the first pole post part, the second pole post part is sealingly connected with the top cover plate, the second pole post part is annular and hollow, and the hollow part of the second pole post part is in communication with the tab through hole.

[0021] Optionally, in the top cover assembly, the second pole post part is welded with the first pole post part.

[0022] Optionally, in the top cover assembly, a second sealing member in the form of a ring is further included, and the second sealing member is arranged at the connection between the second pole post part and the top cover plate.

[0023] Optionally, in the top cover assembly, the second pole post part comprises:

[0024] a base body in a ring shape, the base body being sealingly connected to the top cover plate;

[0025] a second annular protrusion provided at one end of the base body towards the first pole post part, the second annular protrusion being welded to the first pole post part and forming a receiving cavity in communication with the tab through hole with the first pole post part.

[0026] Optionally, in the top cover assembly described above, the second annular protrusion comprises:

[0027] a side wall extending in a first direction, a bottom end of the side wall being provided at the base body;

[0028] an inner edge extending in a second direction, the inner edge being provided at a top end of the side wall, the inner edge being welded to the first pole post part.

[0029] Optionally, in the top cover assembly described above, one end of the first pole post part towards the second pole post part is provided with a boss, the boss being provided inside the inner edge, a top surface of the inner edge abutting against the first pole post part, and the inner edge being welded at a joint with the boss.

[0030] Optionally, in the top cover assembly described above, the electrically conductive part comprises a first electrically conductive part and a second electrically conductive part made of different materials, the first electrically conductive part being welded to the first pole post part, the second electrically conductive part being electrically connected to the first electrically conductive part in cooperation, and the first electrically conductive part being made of the same material as the first pole post part.

[0031] Optionally, in the top cover assembly described above, the first pole post part with a negative polarity comprises a first pole part and a second pole part, the first pole part being welded to the first electrically conductive part, the second pole part being electrically connected to the first pole part in cooperation, the first pole part and the first electrically conductive part being made of aluminum, and the second pole part and the second electrically conductive part being made of copper.

[0032] Optionally, in the top cover assembly described above, the electrically conductive part as a whole is made of the same material as the first pole post part.

[0033] Optionally, in the top cover assembly described above, the pole terminal with a positive polarity is made of aluminum as a whole.

[0034] Optionally, in the top cover assembly described above, a plurality of the pole terminals are included, and at least two of the pole terminals among the plurality of the pole terminals are different in polarity.

[0035] Optionally, in the top cover assembly described above, the electrically conductive part and the pole post form a tab gap in communication with the tab through hole, and the pole post is provided with a welding surface towards the tab gap.

[0036] The traditional battery tab folding occupies a certain space of the battery cell, and thus affects the energy density of the battery. The top cover assembly provided in the application saves the space occupied by the tab folding by providing a tab through hole on the pole, and the tab can pass through the tab through hole to be electrically connected with the terminal of the pole, thus more space is left for the battery cell, thereby facilitating the increase of the energy density of the battery and the increase of the capacity of the battery.

[0037] In addition, the electrically conductive component is welded to the pole, and the projection of the area surrounded by the first weld seam on the plane of the top cover plate covers the projection of the tab through hole on the plane of the top cover plate, thereby forming a seal between the electrically conductive component and the pole. Meanwhile, a first sealing member is further arranged between the electrically conductive component and the pole, and the projection of the area surrounded by the first sealing member on the plane of the top cover plate covers the projection of the tab through hole on the plane of the top cover plate, thereby forming another seal between the electrically conductive component and the pole. The double seals increase the sealing reliability of the pole and the electrically conductive component, and improve the safety of the battery.

[0038] In summary, the top cover assembly provided in the application reduces the space occupied by the tab while ensuring the safety of the battery, and increases the capacity of the battery.

[0039] In some embodiments, the outer edge of the electrically conductive component is welded to the pole, and the first sealing member is arranged on the inner side of the first weld seam. In this technical solution, the first sealing member forms a primary seal between the electrically conductive component and the pole, and the first weld seam forms a secondary seal between the electrically conductive component and the pole. That is, under the sealing effect of the first sealing member, the electrolyte gasification cannot volatilize to the contact position of the electrically conductive component and the pole, thereby avoiding the formation of a potential difference and causing electrochemical corrosion. Therefore, the safety of the battery is further improved.

[0040] In order to achieve the above-mentioned purpose, the utility model also provides a kind of battery and electric device, and the battery and electric device include the top cover assembly of any one described above. Since the top cover assembly described above has the technical effects described above, the battery and electric device with the top cover assembly should also have corresponding technical effects. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0042] Figure 1 It is a structural schematic diagram of the battery of one specific embodiment of the application;

[0043] Figure 2 It is a structural schematic diagram of the battery of one specific embodiment of the application;Figure 1 exploded view of the top cover assembly of one embodiment of the present application;

[0044] Figure 3 exploded view of the top cover assembly of one embodiment of the present application;

[0045] Figure 4 cross-sectional view of the top cover assembly of one embodiment of the present application assembled to the cell assembly;

[0046] Figure 5 cross-sectional view of the top cover assembly of another embodiment of the present application assembled to the cell assembly;

[0047] Figure 6a partial structural view of the top cover assembly of one embodiment of the present application;

[0048] Figure 6b rear view of the electrical lead of Figure 6a

[0049] cross-sectional view of the electrical lead of one embodiment of the present application; Figure 7

[0050] structural view of the electrical lead of one embodiment of the present application; Figure 8a

[0051] rear view of the electrical lead of Figure 8b Figure 8a cross-sectional view of the electrical lead of

[0052] Figure 9 structural view of the electrical lead of another embodiment of the present application;

[0053] Figure 10a rear view of the electrical lead of

[0054] Figure 10b Figure 10a cross-sectional view of the electrical lead of

[0055] Figure 11 structural view of the electrical lead of another embodiment of the present application; Figure 10a

[0056] Figure 12 exploded view of the cell assembly of one embodiment of the present application;

[0057] Figure 13a cross-sectional view of one pole terminal of a single cell battery;

[0058] Figure 13b cross-sectional view of another pole terminal of a single cell battery;

[0059] ​​​Figure 14a A cross-sectional view of a terminal of a pole of a multi-core battery;

[0060] Figure 14b A cross-sectional view of another terminal of a pole of a multi-core battery.

[0061] Reference signs:

[0062] 10 - battery;

[0063] 1 - cell assembly; 2 - top cover assembly; 3 - shell;

[0064] 11 - cell; 111 - cell body; 112 - tab; 1121 - connecting part; 1122 - transition part; 1123 - welding part;

[0065] 12 - tab rubber layer; 13 - insulating sheet; 131 - avoiding slot; 14 - Mylar film;

[0066] 21 - top cover plate;

[0067] 22 - pole terminal; 201 - first welding seam; 202 - second welding seam; 203 - third welding seam; 206 - welding surface; 207 - tab through hole; 208 - tab gap; 209 - accommodating cavity;

[0068] 221 - pole; 2211 - first pole part; 22111 - pole counterbore; 22112 - first annular protrusion; 22113 - pole counterbore; 22114 - boss; 2212 - second pole part; 22121 - base; 22122 - second annular protrusion; 22122a - side wall; 22122b - inner edge;

[0069] 222 - electrically conductive part; 2221 - welding counterbore; 2222 - first sealing ring groove; 2223 - first conductive part; 2224 - second conductive part; 2225 - contact surface; 2226 - assembly surface;

[0070] 223 - first sealing member;

[0071] 23 - second sealing member; 24 - first plastic member; 25 - second plastic member; 26 - explosion-proof valve; 27 - explosion-proof valve film;

[0072] 31 - accommodating cavity; 32 - mouth. DETAILED DESCRIPTION

[0073] The utility model discloses a top cover assembly, battery and electric device to ensure the safety of battery while increasing the capacity of battery, reduce the manufacturing cost.

[0074] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0075] Please refer to Figure 1 and Figure 2 The battery 10 mainly comprises a cell assembly 1, a top cover assembly 2 and a shell 3. The battery is provided with at least one positive pole post terminal and at least one negative pole post terminal, which can be arranged on the same side of the battery or on the opposite side of the battery. No matter what form of the above-mentioned battery, the top cover assembly provided by the present application can be applied. In addition, the battery provided by the present application includes but is not limited to a square battery, a blade battery and a cylindrical battery. The top cover assembly 2 provided by the present application is suitable for but not limited to batteries of different structures such as square batteries, blade batteries and cylindrical batteries. The cell assembly 1 can be a single cell, or a multi-cell structure such as a double cell, a triple cell, a four-cell, etc. The shell 3 has a receiving cavity 31 for placing the cell assembly 1. The shape of the shell 3 is adjusted according to the type of the battery, for example, when the battery is a square battery, the shell 3 is square, and when the battery is a cylindrical battery, the shell 3 is cylindrical.

[0076] Please refer to Figures 2-5 In some embodiments, the top cover assembly provided by the present application comprises a top cover plate 21 and a pole post terminal 22. The top cover plate 21 is used to be assembled to the mouth 32 of the shell 3, and its shape is set according to the shape of the shell 3. The type of the battery of the present application is not limited, for example, when the battery is a square battery, the top cover plate 21 is square, and when the battery is a cylindrical battery, the top cover plate 21 is circular. The pole post terminal 22 comprises a pole post 221, an electrically conductive component 222 and a first sealing member 223. The pole post 221 has electrical conductivity and is used to be electrically connected with the tab 112 of the cell assembly 1. The pole post 221 is provided with a tab through hole 207, and the tab 112 can be arranged in the tab through hole 207 and in contact with the pole post 221. In addition, the side of the pole post 221 away from the cell assembly is communicated with the receiving cavity 31 of the cell assembly 1 in the shell by the arrangement of the tab through hole 207. The number of the tab through hole 207 can be set as required, which is not limited here, for example, the number of the tab through hole 207 is set according to the number of the tab 112, and specifically, the tab through hole 207 can be set as one or multiple, for example, the number of the tab through hole 207 is 1-4. It should be noted that the plurality in the present application refers to two or more.

[0077] The electrically conductive component 222 is welded with the pole post 221, and the first weld 201 formed is annular. It should be noted that annular or ring-shaped in the present application means one round, and the shape is not specifically limited, such as a circular ring, a triangular ring, a square ring, an irregular ring, etc. The projection of the area surrounded by the first weld 201 on the plane of the top cover plate 21 covers the projection of the tab through hole 207 on the plane of the top cover plate 21. For example, with reference to Figure 4 With the plane of the top cover plate 21 as the reference plane A, the projection of the area surrounded by the first weld 201 on the reference plane A covers the projection of the tab through hole 207 on the reference plane A, or in other words, the projection of the first weld 201 on the reference plane A is outside or aligned with the projection of the tab through hole 207 on the reference plane A, so that the first weld 201 constitutes a seal between the electrically conductive component 222 and the pole post 221. It can be understood that when the tab through hole 207 is inclined relative to the top cover plate 21, or the tab through hole 207 is an irregular hole, the projection of the tab through hole 207 on the plane of the top cover plate 21 refers to the projection of the end aperture of the tab through hole 207 facing the electrically conductive component 222 on the plane of the top cover plate 21. In addition, when the number of tab through holes 207 is multiple, the projection of the area surrounded by the first weld 201 on the plane of the top cover plate 21 covers the projection of each tab through hole 207 on the plane of the top cover plate 21.

[0078] The electrically conductive component 222 cooperates with the pole post 221 to close the end of the pole post 221 away from the battery cell assembly, thereby preventing the electrolyte in the housing accommodating cavity 31 from leaking out through the tab through hole 207. In addition, it can be understood that the electrically conductive component 222 has electrical conductivity, and the electrically conductive component 222 is welded with the pole post 221, so that the indirect electrical connection of the pole post 221 with the busbar component and the like is conveniently achieved by using the electrically conductive component 222, and it is beneficial to increase the connection area of the electrical connection, thereby facilitating the reduction of the electrical resistance of the electrical connection. In addition, by cooperating the electrically conductive component 222 with the pole post 221, it is convenient to form the tab through hole 207 and the welding operation of the tab 112 after being inserted into the tab through hole 207 and the pole post 221. During processing, the tab 112 can be first inserted through the tab through hole 207 and welded to the wall surface of the pole post 221 facing the electrically conductive component 222, and then the electrically conductive component 222 is welded with the pole post 221 to fixedly connect and achieve the sealing between the electrically conductive component 222 and the pole post 221.

[0079] The first seal 223 is annular, is arranged between the electrically-conductive component 222 and the pole post 221, and covers the projection of the tab through hole 207 on the plane of the top cover plate 21 in projection on the plane of the top cover plate 21. In this application, the number of the first seal 223 can be one or more. For example, the number of the first seal 223 is 1-4, so as to ensure the sealing effect while taking into account the assembly space. For example, please refer to Figure 4 With the plane of the top cover plate 21 as the reference plane A, the projection of the area surrounded by the first seal 223 on the reference plane A covers the projection of the tab through hole 207 on the reference plane A, or in other words, the first seal 223 is projected on the reference plane A and is sleeved outside or aligned with the projection of the tab through hole 207 on the reference plane A, so that the first seal 223 constitutes another seal between the electrically-conductive component 222 and the pole post 221. In addition, when the number of the tab through hole 207 is more than one, the projection of the area surrounded by the first seal 223 on the plane of the top cover plate 21 covers the projection of each tab through hole 207 on the plane of the top cover plate 21. It needs to be explained that the form of the first seal 223 is not limited here. For example, the first seal 223 adopts a sealing ring, which is simple in structure and convenient to assemble.

[0080] It needs to be explained that in the above technical solution, the pole post terminal 22 of the top cover assembly can be one or more, and at least one pole post terminal 22 includes the pole post 221, the electrically-conductive component 222 and the first seal 223 described above. That is, all the pole post terminals 22 of the top cover plate 21 can adopt the above structural design, or a part of the pole post terminals 22 of the top cover plate 21 adopts the above structural design, and the other part of the pole post terminals 22 is of other structures, such as the structure of the conventional pole post terminal 22.

[0081] The folding of the conventional battery tab 112 occupies a certain space of the battery cell, thus affecting the energy density of the battery. The top cover assembly provided in this application has the tab through hole 207 formed on the pole post 221, and the tab 112 can pass through the tab through hole 207 to be electrically connected with the pole post terminal 22, so that the space occupied by the folding of the tab 112 is saved, and there is no need to set a connecting piece, thus leaving more space for the battery cell, thereby being beneficial to improving the energy density of the battery and increasing the capacity of the battery.

[0082] In addition, the electrically-conductive component 222 is welded to the pole post 221, and the first weld 201 constitutes a seal between the electrically-conductive component 222 and the pole post 221. At the same time, the first seal 223 is arranged between the electrically-conductive component 222 and the pole post 221, and the first seal 223 constitutes another seal between the electrically-conductive component 222 and the pole post 221, so that the double sealing increases the sealing reliability of the pole post 221 and the electrically-conductive component 222 and improves the safety of the battery.

[0083] In summary, the top cover assembly provided by the application reduces the space occupied by the tab 112 while ensuring the safety of the battery, and increases the battery capacity.

[0084] In some embodiments, the outer edge of the electrically conductive component 222 is welded to the pole 221, and the first seal 223 is arranged inside the first weld 201. It can be understood that the first seal 223 is arranged inside the first weld 201, specifically, the projection of the first seal 223 on the plane of the top cover plate 21 is arranged inside the projection of the first weld 201 on the plane of the top cover plate 21. In this technical solution, the first seal 223 forms a primary seal between the electrically conductive component 222 and the pole 221, and the first weld 201 forms a secondary seal between the electrically conductive component 222 and the pole 221. Due to the sealing effect of the first seal 223, in the case that the materials at the contact position of the electrically conductive component 222 and the pole 221 are different, the area of the electrolyte volatilized to the contact position of the electrically conductive component 222 and the pole 221 after gasification is reduced, thereby reducing the potential difference formed thereby and the electrochemical corrosion caused thereby. Therefore, the safety of the battery is further improved.

[0085] For example, the first seal 223 is arranged at the innermost side of the contact position of the electrically conductive component 222 and the pole 221. That is, the contact position of the electrically conductive component 222 and the pole 221 is isolated outside the first seal 223, and due to the sealing effect of the first seal 223, in the case that the materials at the contact position of the electrically conductive component 222 and the pole 221 are different, the electrolyte volatilized to the contact position of the electrically conductive component 222 and the pole 221 after gasification is avoided, thereby avoiding the potential difference formed thereby and the electrochemical corrosion caused thereby.

[0086] In some embodiments, the pole post 221 comprises a pole post sink 22111 and a first annular protrusion 22112 arranged at one end of the pole post sink 22111 towards the electrically conductive component 222, a pole post sink groove 22113 is formed between the pole post sink 22111 and the first annular protrusion 22112, the tab through hole 207 is arranged in the pole post sink 22111, and the electrically conductive component 222 is arranged in the pole post sink groove 22113 and welded with the first annular protrusion 22112. It can be understood that the pole post sink 22111 and the first annular protrusion 22112 can be an integral structure or a split structure connected by a conventional fixing method. The pole post sink 22111 and the first annular protrusion 22112 enclose the pole post sink groove 22113, and the electrically conductive component 222 is arranged in the pole post sink groove 22113. On the one hand, the pole post sink 22111 can play a positioning role on the electrically conductive component 222 in the first direction; on the other hand, the first annular protrusion 22112 can play a positioning role on the side surface of the electrically conductive component 222, i.e., in the second direction and the third direction. Among them, the first direction is the arrangement direction of the pole post terminal 22 and the electrically conductive component 222, Figure 4 Among them, the first direction is the up-down direction of the paper. The second direction and the third direction are perpendicular to the first direction, Figure 4 Among them, the second direction is the left-right direction, and the third direction is the direction perpendicular to the paper. For example, the first direction is the height direction of the battery, the second direction is the thickness direction of the battery, and the third direction is the width direction of the battery. In this embodiment, through the cooperation of the pole post sink 22111 and the first annular protrusion 22112, the electrically conductive component 222 can be well positioned, thereby facilitating the assembly and accurate positioning of the electrically conductive component 222, and facilitating the welding of the first annular protrusion 22112 of the electrically conductive component 222.

[0087] In some embodiments, referring to Figures 4-7 and Figure 8a and Figure 8b , the edge of the electrically conductive component 222 is provided with an annular welding sink 2221, the top surface of the welding sink 2221 is flush with the top surface of the first annular protrusion 22112, and the welding sink 2221 is welded with the first annular protrusion 22112. The welding sink 2221 is formed by sinking the top edge of the electrically conductive component 222, i.e., the thickness of the welding sink 2221 in the first direction is less than the thickness of the middle part of the electrically conductive component 222 in the first direction. The top surface of the welding sink 2221 is flush with the top surface of the first annular protrusion 22112, and welding is performed from the connection between the two, thereby ensuring the welding quality.

[0088] In some embodiments, referring to Figure 9The thickness T0 of the electrically conductive component 222 in the first direction is greater than 1 mm, and the depth T1 of the welding sink 2221 in the first direction is not less than 0.1 mm. In this way, reliable connection and electrical conduction between the electrically conductive component 222 and the pole terminal 22 can be ensured, and the height of the welding bead after welding does not exceed the top surface of the electrically conductive component 222, which affects the welding of the top cover assembly and the busbar. For example, the thickness T0 of the electrically conductive component 222 in the first direction is in the range of 2-5 mm, specifically 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm. The depth T1 of the welding sink 2221 in the first direction is in the range of 0.15-2 mm, specifically 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm or 2 mm. In this way, the weight of the electrically conductive component 222 can be reduced, thereby reducing the weight of the top cover assembly and the battery, reducing the cost, and at the same time, the yield can be ensured.

[0089] In some embodiments, the first sealing member 223 is arranged between the end surface of the electrically conductive component 222 facing the pole sink 22111 and the pole sink 22111. The pole sink 22111 can abut the end surface of the electrically conductive component 222 facing the pole sink 22111 to position the first sealing member 223 between the two abutting surfaces, i.e. between the end surfaces of the pole sink 22111 and the electrically conductive component 222 in the first direction, so that the sealing is reliable and the assembly is convenient. For example, the first sealing member 223 is arranged adjacent to the pole sink 22111 and the tab through hole 207, so that the electrolyte gasification and volatilization to the contact position between the electrically conductive component 222 and the pole 221 is completely avoided.

[0090] In some embodiments, the first sealing member 223 is a first sealing ring. For example, the material of the first sealing ring can be PFA (Polyfluoroalkoxy, soluble polytetrafluoroethylene), fluororubber, silicone rubber, nitrile rubber, etc. The first sealing ring can be an O-ring, a rectangular sealing ring, a Y-shaped sealing ring, etc. In order to ensure air tightness, fluororubber or PFA is preferred. The first sealing member 223 adopts the first sealing ring, which has a simple structure and is convenient to assemble. For example, the compression amount of the first sealing ring is in the range of 10%-50%, specifically 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%, so as to ensure the sealing performance. In other embodiments, the first sealing member 223 can also adopt other sealing structures.

[0091] In some embodiments, please refer to Figure 8a and Figure 8bThe first sealing ring groove 2222 is arranged on the end surface of the electrically conductive component 222 facing the pole post sink 22111, and the first sealing ring is arranged in the first sealing ring groove 2222. The depth of the first sealing ring groove 2222 in the first direction is less than the thickness of the first sealing ring, so as to press the first sealing ring between the first sealing ring groove 2222 and the pole post terminal 22. It can be understood that the first sealing ring groove 2222, i.e. the annular groove arranged on the end surface of the electrically conductive component 222, can position the first sealing ring, facilitate assembly of the first sealing ring, prevent displacement of the first sealing ring due to extrusion, and thus improve the sealing reliability. The number of the first sealing ring grooves 2222 corresponds to the number of the first sealing rings, i.e. one first sealing ring groove 2222 is arranged corresponding to one first sealing ring, and a plurality of first sealing ring grooves 2222 are arranged corresponding to a plurality of first sealing rings, and the plurality of first sealing ring grooves 2222 are arranged in sequence.

[0092] For example, referring to Figure 9 The depth T2 of the first sealing ring groove 2222 in the first direction is not less than 0.15 mm, so as to satisfy the effective positioning of the first sealing ring. Preferably, the depth T2 of the first sealing ring groove 2222 in the first direction ranges from 0.2 mm to 1.5 mm, and specifically is 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, etc. The depth of the first sealing ring groove 2222 is set as above, so as to ensure the sealing compression amount of the first sealing ring, thereby ensuring the sealing effect.

[0093] In the above embodiments, the first sealing ring groove 2222 is arranged on the electrically conductive component 222 to position the first sealing ring 223. In other embodiments, the sealing ring groove for positioning the first sealing ring can also be arranged on the pole post 221. The second sealing ring groove is arranged on the end surface of the pole post sink 22111 facing the electrically conductive component 222, the first sealing ring is arranged in the second sealing ring groove, and the depth of the second sealing ring groove in the first direction is less than the thickness of the first sealing ring. The second sealing ring groove can be arranged correspondingly with reference to the first sealing ring groove 2222 described above, and details are not described herein. In other embodiments, the first sealing ring groove 2222 can be arranged on the electrically conductive component 222, the second sealing ring groove is arranged on the end surface of the pole post sink 22111 facing the electrically conductive component 222, and the sum of the depths of the first sealing ring groove 2222 and the second sealing ring groove in the first direction is not greater than the thickness of the first sealing ring, so as to ensure the sealing compression amount of the first sealing ring.

[0094] In some embodiments, referring to Figures 4-7The pole 221 includes a first pole portion 2211 and a second pole portion 2212. The electrically conductive component 222 is welded to the first pole portion 2211, the first seal 223 is arranged between the electrically conductive component 222 and the first pole portion 2211, and the tab through hole 207 is arranged in the first pole portion 2211. The second pole portion 2212 is arranged at an end of the first pole portion 2211 away from the electrically conductive component 222 and is sealingly and fixedly connected to the first pole portion 2211. The second pole portion 2212 is sealingly connected to the top cover plate 21. The second pole portion 2212 is annular and has a hollow portion that is in communication with the tab through hole 207. In this embodiment, the pole 221 has a split structure, i.e., includes the split first pole portion 2211 and the second pole portion 2212. The first pole portion 2211 and the second pole portion 2212 are distributed along a first direction. The first pole portion 2211 is used to cooperate with the electrically conductive component 222. The first seal 223 and the tab through hole 207 are both arranged in the first pole portion 2211. The second pole portion 2212 is used to cooperate with the top cover plate 21. The second pole portion 2212 is annular and has a hollow portion that is in communication with the tab through hole 207, so as to avoid the tab 112. The tab 112 can be arranged in the tab through hole 207 through the hollow portion. The second pole portion 2212 is sealingly and fixedly connected to the first pole portion 2211, so as to ensure the air tightness of the top cover assembly. The pole terminal 22 has the split structure of the first pole portion 2211 and the second pole portion 2212, which can reduce the manufacturing difficulty and improve the production efficiency.

[0095] In the case where the pole 221 includes the pole sink 22111 and the first annular protrusion 22112, both of them are part of the first pole portion 2211. That is, the first pole portion 2211 includes the pole sink 22111 and the first annular protrusion 22112, so as to be welded to the electrically conductive component 222 and to arrange the first seal 223.

[0096] In some embodiments, the second pole portion 2212 is welded to the first pole portion 2211. The second pole portion 2212 is fixedly connected to the first pole portion 2211 by welding, which is convenient to prepare, reliable in connection, and can realize the sealing and electrical conduction of the second pole portion 2212 and the first pole portion 2211 at the same time, so as to simplify the structure and assembly process.

[0097] In some embodiments, the top cover assembly 2 further comprises a second sealing member 23 in the form of a ring, which is arranged at the joint of the second pole post part 2212 and the top cover plate 21. The top cover plate 21 and the second pole post part 2212 are sealed by the second sealing member 23, which is convenient to assemble and reliable in sealing. In the present application, the number of the second sealing member 23 can be one or more. It should be noted that the form of the second sealing member 23 is not specifically limited here. For example, the second sealing member 23 is in the form of a second sealing ring, which is simple in structure and convenient to assemble. The material of the second sealing ring can be PFA (Polyfluoroalkoxy, soluble polytetrafluoroethylene), fluororubber, silicone rubber, nitrile rubber, etc. The second sealing ring can be an O-ring, a rectangular sealing ring, a Y-shaped sealing ring, etc. In order to ensure air tightness, fluororubber or PFA is preferably used.

[0098] In some embodiments, the second pole post part 2212 comprises a base body 22121 and a second annular protrusion 22122. The base body 22121 is in the form of a ring and is sealingly connected to the top cover plate 21. The second annular protrusion 22122 is arranged at one end of the base body 22121 facing the first pole post part 2211, is welded to the first pole post part 2211, and together with the first pole post part 2211 encloses the accommodation cavity 209 in communication with the tab through hole 207. It can be understood that the second annular protrusion 22122 and the base body 22121 can be in an integrated structure or in a split structure connected by a conventional fixing method. The base body 22121 can cooperate with the top cover plate 21 to compress the second sealing ring to achieve a sealing effect. The accommodation cavity enclosed by the second annular protrusion 22122 and the first pole post part 2211 can accommodate the tab 112, and the top cover assembly further provides accommodation space for the tab 112, reduces the occupation of internal space of the battery by the tab 112, and further helps to improve the capacity of the battery.

[0099] In some embodiments, referring to Figure 7 , the second annular protrusion 22122 comprises a side wall 22122a and an inner edge 22122b. The side wall 22122a extends in a first direction, and the bottom end of the side wall 22122a is arranged at the base body 22121. The inner edge 22122b extends in a second direction, and the inner edge 22122b is arranged at the top end of the side wall 22122a and is welded to the first pole post part 2211. It can be understood that the side wall 22122a and the inner edge 22122b can be in an integrated structure or in a split structure connected by a conventional fixing method. The bottom end of the side wall 22122a, i.e., one end of the side wall 22122a away from the electrically conductive component 222 in the first direction, and the top end, i.e., the other end opposite to it. The side wall 22122a encloses the accommodation cavity 209 to provide accommodation space for the tab 112. The arrangement of the inner edge 22122b facilitates welding to the first pole post part 2211 to ensure the welding quality.

[0100] In some embodiments, the first pole post part 2211 is provided with a boss 22114 at one end thereof towards the second pole post part 2212, the boss 22114 is provided on the inner surface of the inner edge 22122b, the top surface of the inner edge 22122b abuts against the first pole post part 2211, and the joint between the inner edge 22122b and the boss 22114 is welded. In the case where the first pole post part 2211 comprises the pole post sink 22111 and the first annular protrusion 22112 as described above, the boss 22114 is provided on the back surface of the pole post sink 22111, i.e. the end surface facing away from the electrically conductive component 222. In this embodiment, on the one hand, the first pole post part 2211 can play a positioning role on the inner edge 22122b of the second pole post part 2212 in the first direction; on the other hand, the boss 22114 can play a positioning role on the inner surface of the inner edge 22122b, i.e. in the second direction and the third direction. Therefore, through the cooperation of the boss 22114 and the inner edge 22122b, a good positioning role can be played on the second pole post part 2212, thereby facilitating the assembly and accurate positioning of the second pole post part 2212 and the first pole post part 2211, and facilitating the welding of the two. Exemplarily, the joint between the inner edge 22122b and the boss 22114 is welded to form a second weld 202.

[0101] In some embodiments, the pole post 221 and the electrically conductive component 222 are made of metal materials to provide good electrical conductivity. Exemplarily, the materials of the pole post 221 and the electrically conductive component 222 can be copper materials, aluminum materials, copper-aluminum composites, copper-steel composites, etc.

[0102] In some embodiments, referring to Figures 8a-8b and Figure 9 , the electrically conductive component 222 comprises a first conductive part 2223 and a second conductive part 2224 made of different materials, the first conductive part 2223 is welded with the first pole post part 2211, the second conductive part 2224 cooperates with and is electrically connected with the first conductive part 2223, and the material of the first conductive part 2223 is the same as that of the first pole post part 2211. That is, the electrically conductive component 222 adopts a composite structure, the first conductive part 2223 is made of the same material as the first pole post part 2211, thereby facilitating the electrical connection between the first conductive part 2223 and the first pole post part 2211, such as the reliable and stable connection between the first conductive part 2223 and the first pole post part 2211 through welding. In addition, since the material of the second conductive part 2224 is different from that of the first conductive part 2223, the second conductive part 2224 can be electrically connected with the bus component and the like made of a material different from that of the first pole post part 2211. Furthermore, the use of composite materials can reduce the weight and cost of the electrically conductive component 222, and further reduce the weight and cost of the top cover assembly and the battery.

[0103] In some specific examples, the first pole part 2211 with negative polarity includes a first pole part and a second pole part, the first pole part is welded with the first conductive part 2223, the second pole part is matched with the first pole part and is electrically connected, the material of the first pole part and the first conductive part 2223 is aluminum, and the material of the second pole part and the second conductive part 2224 is copper. That is, the first pole part 2211 with negative polarity also adopts composite material, and the first pole part and the second pole part are matched to reduce the weight and cost of the first pole part 2211. In the case where the first pole part 2211 includes the pole column sink 22111 and the first annular protrusion 22112, the first pole part can be the first annular protrusion 22112, and the corresponding second pole part is the pole column sink 22111.

[0104] For example, in the case where the first pole part 2211 includes the pole column sink 22111 and the first annular protrusion 22112, when the pole terminal 22 is a negative pole terminal, the pole 221 and the conductive part 222 of the pole terminal 22 are copper-aluminum composite material. The first conductive part 2223 of the conductive part 222 is provided with a welding sink 2221 and a contact surface 2225, and the second conductive part 2224 is provided with a first sealing ring groove 2222 and an assembly surface 2226. The material of the pole 221 is copper-aluminum composite material, and the pole column sink 22111, the first annular protrusion 22112 and the welding surface 206 are provided, the inner wall surface of the first annular protrusion 22112 is assembled with the contact surface 2225 of the first conductive part 2223 and the assembly surface 2226 of the second conductive part 2224, and the first annular protrusion 22112 and the first conductive part 2223 are welded and fixed at the welding sink 2221 of the first conductive part 2223, the material of the first annular protrusion 22112 and the first conductive part 2223 is the same, such as aluminum, and the welding of aluminum material and aluminum material has good fluidity and is not easy to crack, which is beneficial to improve the sealing effect of the welding part. The first sealing ring groove 2222 of the second conductive part 2224 is in contact with the overpressure of the first sealing ring, and the bottom surface of the second conductive part 2224 and the welding surface 206 of the pole 221 are provided with the tab 112, and the material of the second conductive part 2224 and the welding surface 206 is consistent. The second pole part 2212 preferably adopts copper material.

[0105] The above examples illustrate that the conductive part 222 can adopt composite material, and in other examples, please refer to Figures 10a-10b and Figure 11 The conductive part 222 as a whole can also adopt the same material. Specifically, the material of the conductive part 222 as a whole is the same as that of the first pole part 2211. For example, the material of the conductive part 222 as a whole and the material of the first pole part 2211 are both aluminum.

[0106] In some embodiments, the overall material of the positive polar pole terminal 22 is aluminum. For example, when the pole terminal 22 is a positive pole terminal, the material of the first pole part 2211, the electrically conductive part 222, and the second pole part 2212 of the pole terminal 22 is aluminum. This ensures reliable electrical connection between different pole terminals 22 and corresponding tabs 112, while ensuring welding yield.

[0107] In some embodiments, the top cover assembly 2 includes a plurality of pole terminals 22, at least two of which have different polarities. That is, the top cover assembly 2 is provided with a plurality of pole terminals 22, at least one of which is a negative pole terminal and at least one of which is a positive pole terminal to meet the corresponding battery functional requirements.

[0108] In some embodiments, referring to Figure 4 and Figure 5 , the electrically conductive part 222 and the pole 221 form a tab gap 208 in communication with the tab through hole 207, and the pole 221 is provided with a welding surface 206 facing the tab gap 208. In this embodiment, when the top cover assembly 2 is assembled with the cell assembly 1, the tab 112 passes through the tab through hole 207 into the tab gap 208, and the end of the tab 112 is folded to contact the welding surface 206 and is welded to fix and electrically connect the tab 112 and the welding surface 206. For example, the tab 112 passes through the tab through hole 207 and is folded to the pole sink 2211 and is welded to the welding surface 206. In this way, the pole 221 and the tab 112 are reliably welded.

[0109] In some embodiments, the width of the tab through hole 207 is not less than 0.2mm to facilitate the tab 112 to pass through and reduce the weight of the yield. Preferably, the width of the tab through hole 207 is in the range of 0.3-5mm. For example, the width of the tab through hole 207 is 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm.

[0110] In some embodiments, the top cover assembly 2 further includes a first plastic part 24 and a second plastic part 25, the first plastic part 24 being located between the top cover plate 21 and the pole terminal 22, and the second plastic part 25 being located between the top cover plate 21 and the cell assembly 1 to meet the electrical performance of the battery.

[0111] In some embodiments, the top cover plate 21 is provided with an explosion-proof valve 26 and an explosion-proof valve film 27 to achieve pressure relief and exhaust.

[0112] Based on the top cover assembly provided in the above embodiments, the utility model also provides a battery, referring to Figures 1-2The battery includes the cell assembly 1 and any one of the top cover assemblies 2 in the above embodiments, and the tab 112 of the cell assembly 1 is arranged in the tab through hole 207 and is electrically connected with the pole terminal 22. Since the battery adopts the top cover assembly 2 in the above embodiments, the beneficial effects of the battery refer to the above embodiments.

[0113] In some embodiments, referring to Figure 12 , the cell assembly 1 includes the cell 11, and the cell 11 includes the cell body 111 and the tab 112, the tab 112 extends out of the cell body 111, the tab 112 includes the connecting portion 1121, the transition portion 1122 and the welding portion 1123 which are welded as a whole, the transition portion 1122 is arranged between the connecting portion 1121 and the welding portion 1123, and the connecting portion 1121 is electrically connected with the cell body 111. For example, the tab 112 is provided with the transition portion 1122, the welding portion 1123 and the connecting portion 1121, the first pole portion 2211 is provided with the welding surface 206, the tab through hole 207 and the boss 22114, the second pole portion 2212 is provided with the second annular protrusion 22122, the second annular protrusion 22122 is sleeved outside the boss 22114 and is welded and fixed, and forms the second welding seam 202, the welding portion 1123 is welded with the welding surface 206 and forms the third welding seam 203, and the accommodating cavity surrounded by the second annular protrusion 22122 is used to arrange the transition portion 1122. It should be noted that the cell 11 can be a winding cell or a laminated cell.

[0114] In some embodiments, the cell assembly 1 further includes the tab rubber layer 12, the tab rubber layer 12 covers one end of the connecting portion 1121 which is directed to the top cover assembly 2, and the tab rubber layer 12 extends to contact the cell body 111 at one end along the extension direction of the tab 112 and extends to contact the transition portion 1122 at the other end. The tab rubber layer 12 covers the entire connecting portion 1121 and extends upwards along the transition portion 1122 and does not exceed the tab through hole 207 and extends downwards to part of the cell body 111, so as to prevent the tab 112 from short circuiting. For example, the tab rubber layer 12 is tab rubber paper.

[0115] In some embodiments, the cell assembly 1 further includes the insulating sheet 13, the insulating sheet 13 is provided with the avoiding groove 131, the transition portion 1122 is arranged in the avoiding groove 131, and part of the tab rubber layer 12 is located between the connecting portion 1121 and the insulating sheet 13. The avoiding groove 131 is arranged on the insulating sheet 13 and corresponds to the tab through hole 207, which facilitates the tab 112 to extend out along the avoiding groove 131, and the insulating sheet 13 can prevent the tab 112 from short circuiting and compressing the cell body 111, and can also reduce the cost. Further, the top of the tab rubber layer 12 is arranged in the avoiding groove 131.

[0116] In some embodiments, the battery cell assembly 1 further comprises a Mylar film 14, which is wrapped outside the battery cell body 111 and the mouth portion is folded onto the insulating sheet 13, so that the whole battery cell assembly 1 is bound and insulated from short circuit. For example, the battery cell assembly 1 is sequentially provided with the Mylar film 14, the insulating sheet 13, the tab adhesive layer 12 and the battery cell 11 from the outside to the inside, which are wrapped and bound to each other.

[0117] In some embodiments, the battery comprises a shell 3, which has a receiving cavity 31, the battery cell assembly 1 and the top cover assembly 2 are arranged in the shell 3, the battery cell assembly 1 is arranged inside the receiving cavity 31 except for the part of the tab extending out, and the top cover plate 21 is welded and fixedly sealed with the mouth portion 32 of the shell 3 to ensure the sealing of the battery. For example, the shell 3 is made of metal material to ensure the structural strength of the battery.

[0118] The battery can be a single-battery cell, as shown in Figure 13a and Figure 13b or a multi-battery cell with two, three or four battery cells, as shown in Figure 14a and Figure 14b .

[0119] The application also provides a power consuming device comprising the top cover assembly or the battery of any of the above embodiments. Since the power consuming device adopts the top cover assembly or the battery of the above embodiments, the beneficial effects of the power consuming device are as described above.

[0120] It can be understood that the power consuming device can be designed for energy storage application or power output, or compatible with both application modes, which should belong to the scope of the present application, and specifically includes but is not limited to mobile phones, tablet computers, notebook computers and the like.

[0121] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0122] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application should not be limited to the embodiments shown herein, but should be consistent with the widest scope of principles and novel features disclosed herein.

Claims

1. A top cover assembly, characterized in that, Includes a top cover plate (21) and a terminal block (22), the terminal block (22) comprising: A pole post (221) is provided on the top cover plate (21), and the pole post (221) is provided with a through hole (207). The conductive component (222) is welded to the pole post (221), and the first weld (201) formed is annular. The projection of the area surrounded by the first weld (201) on the plane of the top cover plate (21) covers the projection of the tab through hole (207) on the plane of the top cover plate (21). The first sealing element (223) is annular and is located between the conductive component (222) and the pole post (221). The projection of the area surrounded by the first sealing element (223) on the plane of the top cover plate (21) covers the projection of the pole hole (207) on the plane of the top cover plate (21).

2. The top cover assembly according to claim 1, characterized in that, The outer edge of the conductive component (222) is welded to the pole (221), and the first sealing element (223) is located on the inner side of the first weld (201).

3. The top cover assembly according to claim 1, characterized in that, The electrode post (221) includes an electrode post recess (22111) and a first annular protrusion (22112) located at one end of the electrode post recess (22111) facing the conductive component (222). An electrode post recess (22113) is formed between the electrode post recess (22111) and the first annular protrusion (22112). The electrode tab through hole (207) is located on the electrode post recess (22111). The conductive component (222) is located in the electrode post recess (22113) and is welded to the first annular protrusion (22112).

4. The top cover assembly according to claim 3, characterized in that, The edge of the conductive component (222) is provided with an annular welding platform (2221), which is flush with the top surface of the first annular protrusion (22112), and the welding platform (2221) is welded to the first annular protrusion (22112).

5. The top cover assembly according to claim 3, characterized in that, The first sealing element (223) is located between the end face of the conductive component (222) facing the pole platen (22111) and the pole platen (22111).

6. The top cover assembly according to claim 5, characterized in that, The first sealing element (223) is a first sealing ring; The conductive component (222) has a first sealing ring groove (2222) on its end face facing the electrode post (22111), and the first sealing ring is disposed in the first sealing ring groove (2222). The depth of the first sealing ring groove (2222) is less than the thickness of the first sealing ring. Alternatively, the end face of the pole platen (22111) facing the conductive component (222) is provided with a second sealing ring groove, the first sealing ring is disposed in the second sealing ring groove, and the depth of the second sealing ring groove is less than the thickness of the first sealing ring.

7. The top cover assembly according to any one of claims 1-6, characterized in that, The pole (221) includes: The first pole post (2211) is welded to the conductive component (222), the first sealing member (223) is disposed between the conductive component (222) and the first pole post (2211), and the electrode through hole (207) is disposed in the first pole post (2211). The second pole post (2212) is located at the end of the first pole post (2211) away from the conductive component (222) and is sealed and fixedly connected to the first pole post (2211). The second pole post (2212) is sealed and connected to the top cover plate (21). The second pole post (2212) is annular and its hollow part is connected to the electrode through hole (207).

8. The top cover assembly according to claim 7, characterized in that, The second pole post (2212) is welded to the first pole post (2211).

9. The top cover assembly according to claim 7, characterized in that, It also includes a second annular seal (23), which is located at the connection between the second pole post (2212) and the top cover plate (21).

10. The top cover assembly according to claim 7, characterized in that, The second pole post (2212) includes: The substrate (22121) is annular and is sealed to the top cover plate (21); The second annular protrusion (22122) is provided at one end of the base (22121) facing the first pole post (2211). The second annular protrusion (22122) is welded to the first pole post (2211) and together with the first pole post (2211) forms a receiving cavity (209) that communicates with the pole ear through hole (207).

11. The top cover assembly according to claim 10, characterized in that, The second annular protrusion (22122) includes: A sidewall (22122a) extends along a first direction, and the bottom end of the sidewall (22122a) is disposed on the substrate (22121). The inner edge (22122b) extends along the second direction and is located at the top of the sidewall (22122a). The inner edge (22122b) is welded to the first pole post (2211).

12. The top cover assembly according to claim 11, characterized in that, The first pole post (2211) has a boss (22114) at one end facing the second pole post (2212). The boss (22114) is located inside the inner edge (22122b). The top surface of the inner edge (22122b) abuts against the first pole post (2211). The inner edge (22122b) and the boss (22114) are welded together.

13. The top cover assembly according to claim 7, characterized in that, The conductive component (222) includes a first conductive part (2223) and a second conductive part (2224) made of different materials. The first conductive part (2223) is welded to the first pole part (2211), and the second conductive part (2224) is engaged with and electrically connected to the first conductive part (2223). The material of the first conductive part (2223) is the same as that of the first pole part (2211).

14. The top cover assembly according to claim 13, characterized in that, The first electrode post (2211) with negative polarity includes a first electrode and a second electrode. The first electrode is welded to the first conductive part (2223), and the second electrode is engaged with and electrically connected to the first electrode. The first electrode and the first conductive part (2223) are made of aluminum, and the second electrode and the second conductive part (2224) are made of copper.

15. The top cover assembly according to claim 7, characterized in that, The material of the conductive component (222) is the same as that of the first pole piece (2211).

16. The top cover assembly according to claim 15, characterized in that, The positive polarity of the terminal (22) is made of aluminum.

17. The top cover assembly according to claim 1, characterized in that, It includes a plurality of said pole terminals (22), at least two of said pole terminals (22) having different polarities.

18. The top cover assembly according to claim 1, characterized in that, The conductive component (222) and the pole post (221) form a tab gap (208) that communicates with the tab through hole (207), and the pole post (221) is provided with a welding surface (206) facing the tab gap (208).

19. A battery comprising a cell assembly and a top cover assembly, characterized in that, The top cover assembly is the top cover assembly as described in any one of claims 1-18, and the tab (112) of the battery cell assembly is disposed in the tab through hole (207) and electrically connected to the terminal (22).

20. The battery according to claim 19, characterized in that, The battery cell assembly includes a battery cell, which includes a battery cell body (111) and a tab (112). The tab (112) includes a connecting portion (1121), a transition portion (1122), and a welding portion (1123). The transition portion (1122) is located between the connecting portion (1121) and the welding portion (1123). The connecting portion (1121) is electrically connected to the battery cell body (111). The transition portion (1122) is provided as a tab through hole (207). The welding portion (1123) is welded to the terminal post (221).

21. An electrical appliance, characterized in that, Includes the top cover assembly as described in any one of claims 1-18 or the battery as described in any one of claims 19-20.

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