Top cover assembly, battery monomer, battery and electric device

Abstract

The utility model relates to a top cover assembly and a battery monomer, at least two second connecting parts of a pole column are arranged at intervals along the width direction of a cover plate, namely the thickness direction of a shell, so that tabs extending from at least two battery cells in a battery cell assembly respectively correspond to the positions of the at least two second connecting parts. When the pole column and the battery cell assembly are welded, the pole lug of each battery cell can be directly welded with the corresponding second connecting part respectively, so that an adapter plate is omitted. The first insulating part can play a role in insulating and also can play a better role in limiting the pole column at the same time. Moreover, the first insulating part is generally elastic, so that the gap between the pole and the cover plate can be effectively filled when the pole is assembled. Therefore, the top cover assembly and the battery monomer can ensure the reliability on the premise of omitting an adapter plate. In addition, the utility model also provides a battery and an electric device.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a top cover assembly, a battery cell, a battery, and an electrical device. Background Technology

[0002] A typical lithium-ion battery cell includes a casing, a cell assembly, and a top cover assembly. The top cover assembly includes a cover plate and terminals, which are used for electrical connection to the tabs of the cell assembly. To improve space utilization and simplify manufacturing processes, related technologies omit the adapter tabs in battery cells, directly welding the tabs to the terminals. This necessitates increasing the size of the terminals, especially along the width of the cover plate. When the terminals are larger, the assembly between them and the cover plate becomes more difficult, leading to loosening or gaps, which affects the reliability of both the top cover assembly and the battery cell. Utility Model Content

[0003] Therefore, it is necessary to provide a top cover assembly, battery cell, battery, and power device that can ensure reliability without omitting the adapter piece, in order to address the above problems.

[0004] On one hand, this application provides a top cover assembly, including:

[0005] The cover plate has a first through hole;

[0006] A pole post includes at least one first connecting portion and at least two second connecting portions. The first connecting portion is used to connect an electrical connector, and the second connecting portions are used to connect an electrode tab. The first connecting portion is located on the outside of the cover plate. At least two second connecting portions are spaced apart along the width direction of the cover plate, and a first connecting portion connects adjacent two second connecting portions. Each second connecting portion extends from the first through hole toward the inside of the cover plate.

[0007] A first insulating element is disposed between the pole post and the cover plate. The first insulating element includes a first insulating portion, which is disposed between the first connecting portion and the cover plate.

[0008] In one embodiment, there is one first connecting portion and two second connecting portions, with the first connecting portion disposed between the two second connecting portions;

[0009] And / or, each of the second connecting portions extends from the first through hole toward the inside of the cover plate to beyond the inner surface of the cover plate.

[0010] In one embodiment, the surfaces of the cover plate and the pole are formed with nanopores, and the first insulating part extends into the nanopores.

[0011] In one embodiment, the nanopores are formed on the surface of the first connecting portion near the cover plate and on the surface of the cover plate near the first connecting portion.

[0012] In one embodiment, the bonding strength between the surface of the first connecting portion near the cover plate and the first insulating portion is greater than or equal to 20 MPa;

[0013] And / or, the bonding strength between the surface of the cover plate near the first connecting portion and the first insulating portion is greater than or equal to 20 MPa.

[0014] In one embodiment, the outer surface of the cover plate is provided with a first stepped groove surrounding the circumferential edge of the first through hole, and the nanopores are formed on the bottom wall and / or side wall of the first stepped groove; the first insulating member further includes a second insulating portion, which is disposed between the second connecting portion and the cover plate, and the second insulating portion extends into the nanopores.

[0015] In one embodiment, the outer surface of the cover plate is formed with an integrally formed protrusion that extends circumferentially around the first through hole; the first insulating member further includes a second insulating portion disposed between the second connecting portion and the protrusion, the second insulating portion at least partially covering the protrusion.

[0016] In one embodiment, the surface of the protrusion is formed with the nanopores, and the second insulating portion extends into the nanopores.

[0017] In one embodiment, the end of the protrusion away from the cover plate is bent toward the direction of the first through hole.

[0018] In one embodiment, the protrusion is provided with at least one embedding hole that penetrates the inner and outer surfaces of the protrusion, and the second insulating portion is at least partially embedded in the embedding hole.

[0019] In one embodiment, the first insulating member further includes a third insulating portion, which at least partially fills the space between the second connecting portion and the inner wall of the first through hole.

[0020] In one embodiment, the top cover assembly further includes a first fixing portion and a second fixing portion, wherein, in the thickness direction of the cover plate, the second connecting portion is at least partially located between the first fixing portion and the second fixing portion, and the projections of the first fixing portion, the second connecting portion, and the second fixing portion on the cover plate at least partially overlap.

[0021] In one embodiment, at least one of the first fixing part and the second fixing part is integrally formed with the cover plate.

[0022] In one embodiment, the outer surface of the cover plate is formed with an integrally formed folded portion that extends circumferentially around the first through hole. At least a portion of the folded portion extends to the side of the second connecting portion away from the cover plate. The folded portion is the first fixing portion, and the portion of the cover plate located between the first through hole and the folded portion is the second fixing portion.

[0023] In one embodiment, the second fixing part protrudes from the inner surface of the cover plate in a direction opposite to the first fixing part.

[0024] In one embodiment, the top cover assembly further includes a first welding ring extending circumferentially around the first through hole, the first welding ring being welded to the outer surface of the cover plate and at least a portion of the first welding ring extending to the side of the second connection portion away from the cover plate, the first welding ring being the first fixing portion, and the portion of the cover plate located between the first through hole and the first welding ring being the second fixing portion.

[0025] In one embodiment, the first insulating member further includes a second insulating portion disposed between the second connecting portion and the first welding ring, the second insulating portion at least partially covering the first welding ring.

[0026] In one embodiment, the top cover assembly further includes a second welding ring extending circumferentially around the first through hole, the second welding ring being welded to the outer surface of the cover plate and at least a portion of the second welding ring extending to the side of the second connection portion away from the cover plate, the second welding ring being the first fixing portion, the portion of the cover plate located between the first through hole and the second welding ring being the second fixing portion, and an integrally formed folded portion being formed on the outer surface of the cover plate, the folded portion extending circumferentially around the first through hole and pressing at least a portion of the second welding ring against the cover plate.

[0027] In one embodiment, the first insulating member further includes a second insulating portion disposed between the second connecting portion and the second welding ring, the second insulating portion at least partially covering the second welding ring.

[0028] In one embodiment, the top cover assembly further includes a third welding ring welded to the inner surface of the cover plate and covering the first through hole. The third welding ring has a second through hole through which the second connecting portion passes. An integrally formed folded portion is formed on the outer surface of the cover plate. At least a portion of the folded portion extends to the side of the second connecting portion away from the cover plate. The folded portion is the first fixing portion, and the third welding ring is the second fixing portion.

[0029] In one embodiment, the inner surface of the cover plate is formed with a second stepped groove surrounding the circumferential edge of the first through hole, and the third welding ring is welded to the bottom wall and / or side wall of the second stepped groove.

[0030] In one embodiment, the top cover assembly further includes a fourth welding ring, the fourth welding ring including a base plate and a flange, the base plate being welded to the inner surface of the cover plate and covering the first through hole, and the base plate having a third through hole through which the second connecting portion passes, one end of the flange being connected to the base plate, and the other end of the flange extending to the side of the second connecting portion away from the cover plate, the flange being the first fixing portion, and the base plate being the second fixing portion.

[0031] In one embodiment, the inner surface of the cover plate is formed with a third stepped groove surrounding the circumferential edge of the first through hole, and the base plate is welded to the bottom wall and / or side wall of the third stepped groove.

[0032] In one embodiment, the middle portion of the second connecting portion is recessed toward the inside of the cover plate to form a fifth groove on the outer surface of the second connecting portion and a protrusion on the inner surface of the second connecting portion, the protrusion extending from the first through hole toward the inside of the cover plate.

[0033] In one embodiment, the top cover assembly further includes a sealing ring comprising a first sealing portion and a second sealing portion, the first sealing portion being located between the protrusion and the inner wall of the first through hole, and the second sealing portion being located between the second connecting portion and the cover plate.

[0034] In one embodiment, a fourth groove is formed on the side of the first connecting portion facing the cover plate and / or on the side of the cover plate facing the first connecting portion, the fourth groove at least partially narrowing in the direction from the bottom to the opening, and the first insulating portion partially filling the fourth groove.

[0035] In one embodiment, the first insulating member further includes a second insulating portion disposed between the second connecting portion and the cover plate. The cover plate is provided with a sixth groove, which at least partially narrows in the direction from the bottom to the opening, and the second insulating portion partially fills the sixth groove.

[0036] In one embodiment, the sixth groove is at least partially disposed around the first through hole.

[0037] In one embodiment, the sixth groove is discontinuous.

[0038] On the other hand, this application also provides a battery cell, including a housing, a cell assembly, and a top cover assembly as described in any of the above embodiments; the housing has an opening at at least one end, the cell assembly is housed within the housing, and the top cover assembly covers the opening; the cell assembly includes at least two sets of cells arranged side by side along the thickness direction of the housing, and the at least two sets of cells are correspondingly arranged with at least two second connecting portions, each set of cells extends out a tab, and the tab of each set of cells is connected to the corresponding second connecting portion.

[0039] Compared with the prior art, this application has at least the following advantages:

[0040] In the aforementioned top cover assembly and battery cell, at least two second connecting portions of the terminal post are spaced apart along the width direction of the cover plate, i.e., the thickness direction of the casing. Therefore, the tabs extending from at least two cells in the cell assembly correspond to the positions of at least two second connecting portions. When welding the terminal post to the cell assembly, the tab of each cell can be directly welded to its corresponding second connecting portion, thus eliminating the need for an adapter plate. The first insulating component not only provides insulation but also effectively limits the position of the terminal post. Moreover, in the assembly method where the terminal post is assembled onto the cover plate and then the first insulating component is integrally injection molded, the plastic material used to mold the first insulating component can effectively fill the gap between the terminal post and the cover plate. Therefore, the aforementioned top cover assembly and battery cell can ensure reliability without the need for an adapter plate.

[0041] In addition, this application also provides a battery and an electrical device.

[0042] A battery includes a plurality of battery cells as described in the above embodiments, the plurality of battery cells being electrically connected by an electrical connector, and the electrical connector being connected to the first connection portion.

[0043] An electrical device includes a battery cell as described in the above embodiments or a battery as described in the above embodiments. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of a single battery cell in one embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the top cover assembly in the first embodiment of the present invention;

[0047] Figure 3 for Figure 2 Exploded view of the top cover assembly shown;

[0048] Figure 4 for Figure 2 A cross-sectional view of the top cover assembly shown;

[0049] Figure 5 for Figure 4 A cross-sectional view of the pole post in the top cover assembly shown;

[0050] Figure 6 This is a cross-sectional view of the top cover assembly in the second embodiment of this utility model;

[0051] Figure 7 This is a cross-sectional view of the top cover assembly in the third embodiment of this utility model;

[0052] Figure 8 This is a schematic diagram of the top cover assembly in the fourth embodiment of the present invention;

[0053] Figure 9 for Figure 8 Exploded view of the top cover assembly shown;

[0054] Figure 10 for Figure 8 A cross-sectional view of the top cover assembly shown;

[0055] Figure 11 This is a cross-sectional view of the top cover assembly in the fifth embodiment of this utility model;

[0056] Figure 12 This is a schematic diagram of the top cover assembly in the sixth embodiment of the present invention;

[0057] Figure 13 for Figure 12 Exploded view of the top cover assembly shown;

[0058] Figure 14 for Figure 12A cross-sectional view of the top cover assembly shown;

[0059] Figure 15 This is a schematic diagram of the top cover assembly in the seventh embodiment of the present invention;

[0060] Figure 16 for Figure 15 Exploded view of the top cover assembly shown;

[0061] Figure 17 for Figure 15 A cross-sectional view of the top cover assembly shown;

[0062] Figure 18 This is a schematic diagram of the top cover assembly in the eighth embodiment of the present invention;

[0063] Figure 19 for Figure 18 Exploded view of the top cover assembly shown;

[0064] Figure 20 for Figure 18 A cross-sectional view of the top cover assembly shown;

[0065] Figure 21 This is a structural schematic diagram of the top cover assembly in the ninth embodiment of the present invention;

[0066] Figure 22 for Figure 21 Exploded view of the top cover assembly shown;

[0067] Figure 23 for Figure 22 A cross-sectional view of the top cover assembly shown;

[0068] Figure 24 This is a structural schematic diagram of the top cover assembly in the tenth embodiment of this utility model;

[0069] Figure 25 for Figure 24 Exploded view of the top cover assembly shown;

[0070] Figure 26 for Figure 24 The top cover assembly shown is a cross-sectional view. Detailed Implementation

[0071] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0072] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0075] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0076] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0077] This utility model discloses an electrical device, a battery, and a battery cell. The electrical device includes the battery or the battery cell and is capable of providing electrical energy. The electrical device can be a vehicle, mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, power tool, energy storage device, amusement equipment, elevator, and lifting equipment, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be a carousel, a drop tower, etc.

[0078] The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended vehicles, etc. For new energy vehicles, the aforementioned battery can serve as a driving power source, thereby replacing fossil fuels to provide propulsion. This application does not impose any special restrictions on the aforementioned electrical devices.

[0079] The aforementioned battery can be a battery pack or a battery module. When the battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and multiple battery cells. Multiple battery cells can be electrically connected in series, parallel, or a combination of series and parallel connections, and communicate with the battery management system, which controls and monitors the operating status of each battery cell. Alternatively, multiple battery cells can first be combined with a module management system to form a battery module, and then these battery modules can be electrically connected in series, parallel, or a combination of series and parallel connections to form a battery pack together with the battery management system.

[0080] Multiple battery cells can be mounted on supporting structures such as housings, frames, and brackets. Electrical connections between battery cells and between battery cells and the battery management system can be established via electrical connectors, which can be busbars. Alternatively, battery cells can be electrically connected via their respective terminals. For example, between two adjacent battery cells, one battery cell has a slot on its terminal, and the other battery cell has a corresponding insert on its terminal. The insert is inserted into the slot to achieve electrical connection. Therefore, for one battery cell, the aforementioned electrical connector can be the terminal of another battery cell. Similarly, battery cells and the battery management system can also be electrically connected via mutual insertion, which will not be elaborated further here. The aforementioned battery cells can be lithium-ion, sodium-ion, or magnesium-ion batteries, and their external contours can be cylindrical, flat, cuboid, or other shapes, but are not limited to these. Specifically, in this embodiment, the aforementioned battery cell is a lithium-ion square battery.

[0081] In addition, please see Figure 1 The present invention also provides a top cover assembly 100. In one embodiment of the present invention, the battery cell 10 includes a top cover assembly 100, a housing 200, and a cell assembly 300.

[0082] The housing 200 has a hollow structure, with internal space for accommodating the battery cell assembly 300, electrolyte, and other components. At least one end of the housing 200 has an opening through which the battery cell assembly 300 can be installed. Since the battery cell 10 in this embodiment is a prismatic battery, the outer contour of the housing 200 is cuboid, and its opening is rectangular. The top cover assembly 100 is mounted on the housing and covers its opening, thereby creating a relatively closed environment inside the housing 200 to isolate the battery cell assembly 300 from the external environment. Because the shape of the top cover assembly 100 needs to match the shape of the opening of the housing 200, the top cover assembly 100 is approximately rectangular.

[0083] The cell assembly 300 is the core component of the battery cell 10. To fit the shape of the casing 200, the cell assembly 300 in this embodiment is approximately cuboid in shape. The cell assembly 300 generally includes at least two sets of cells 310 arranged side-by-side along the thickness direction of the casing 200, with each set of cells 310 extending out with tabs 311. Each set of cells 310 may contain one or more cells 310. The cells 310 can be formed by winding or stacking positive electrode plates, negative electrode plates, and a separator that acts as an insulator between the negative and positive electrode plates. The wound cells 310 can be pressed into a flat shape with curved surfaces on both sides. The tabs 311 of each cell 310 are divided into a positive tab (not shown) and a negative tab (not shown), which are led out from the positive and negative electrode plates, respectively.

[0084] In this embodiment, the positive and negative tabs can be located at the same end of the cell 310, or the positive tab can be located at one end of the cell 310 and the negative tab at the opposite end of the cell 310. Specifically, in this embodiment, the cell assembly 300 includes two cells 310, and the positive and negative tabs of each cell 310 are located at the same end of the cell 310 and are spaced apart along the width direction of the cell assembly 300, that is, the width direction of the housing 200. Therefore, one end of the cell assembly 300 has a total of four sets of tabs 331, of which two sets are negative tabs spaced apart along the thickness direction of the housing 200, and the other two sets are positive tabs spaced apart along the thickness direction of the housing 200. The two sets of negative tabs and the two sets of positive tabs are spaced apart along the width direction of the housing 200. The width direction of the housing 200 is also its thickness direction, and the width direction of the cell assembly 300 is also its thickness direction.

[0085] Please refer to the following: Figure 2 , Figure 3 and Figure 4 The top cover assembly 100 in the first embodiment of this utility model includes a pole post 110, a cover plate 120 and a first insulating member 130.

[0086] The cover plate 120 can be formed from a material with high mechanical strength, such as aluminum, aluminum alloy, or steel. The cover plate 120 has an inner side and an outer side arranged opposite each other along its thickness direction. The inner side refers to the surface of the cover plate 120 facing the interior of the housing 200 when covering the opening of the housing 200, while the outer side refers to the surface of the cover plate 120 facing away from the interior of the housing 200. Specifically, in this embodiment, the cover plate 120 is generally rectangular, matching the shape of the opening of the housing 200. The cover plate 120 is provided with a first through hole 121, through which the pole post 110 can be installed.

[0087] Please refer to the following: Figure 5The terminal post 110 includes a first connecting portion 111 and a second connecting portion 112. At least two second connecting portions 112 are provided, and these at least two second connecting portions 112 are spaced apart along the width direction of the cover plate 120. Adjacent second connecting portions 112 are connected by a first connecting portion 111. The width direction of the cover plate 120 is consistent with the thickness direction of the housing 200. The first connecting portion 111 is used to connect an electrical connector (not shown), and the second connecting portion 112 is used to connect a tab 311. When multiple battery cells 10 are connected by an electrical connector, the electrical connector can be connected to the first connecting portion 111 by welding or other methods. The aforementioned electrical connector can be a busbar or a terminal post 110 of another battery cell 10. The connection method between the electrical connector and the first connecting part 111 can be welding, plugging, riveting, snap-fitting, bonding or other methods. Among them, plugging means that one of the electrical connector and the first connecting part 111 is provided with a slot, and the other is provided with a plug. The plug is inserted into the slot to achieve electrical connection. In addition, to improve the electrical connection effect, a spring contact finger can be provided between the plug and the slot wall to increase the contact area between the two.

[0088] Furthermore, the first connecting portion 111 is located on the outside of the cover plate 120, and at least two second connecting portions 112 are spaced apart along the width direction of the cover plate 120. Each second connecting portion 112 extends from the first through hole 121 toward the inside of the cover plate 120.

[0089] Specifically, in this embodiment, each second connecting portion 112 extends from the first through hole 121 toward the inner side of the cover plate 120 and beyond the inner surface of the cover plate 120. The portion of the second connecting portion 112 extending beyond the inner surface of the cover plate 120 is used for welding to the tab 311. Therefore, the portion of the second connecting portion 112 used for welding to the tab 311 is not obstructed by the sidewall of the first through hole 121, resulting in a larger operating space and more convenient operation when welding the tab 311. In other embodiments, the second connecting portion 112 may also be flush with or slightly lower than the inner surface of the cover plate 120.

[0090] The tabs 311 of the battery cell 310 can be welded to the corresponding second connection part 112 by means of laser welding, ultrasonic welding, pressure welding, etc., or they can be bonded and fixed to the corresponding second connection part 112 by means of conductive adhesive.

[0091] Furthermore, in this embodiment, the middle portion of the second connecting portion 112 is recessed towards the inner side of the cover plate 120 to form a fifth groove 1122 on the outer surface of the second connecting portion 112 and a protrusion 1121 on the inner surface of the second connecting portion 112. The protrusion 1121 extends from the first through hole 121 towards the inner side of the cover plate 120. The second connecting portion 112 can be stamped, and the protrusion 1121 is formed simultaneously with the formation of the fifth groove 1122. Therefore, the protrusion 1121 has a hollow structure, which can save material and reduce the weight of the pole post 110. Specifically, stamping processes such as overlaying and deep drawing are used to stamp the sheet metal to form the first connecting portion 111 and each of the second connecting portions 112, which are recessed relative to the first connecting portion 111, on the sheet metal. Compared with the cutting process used in the prior art to remove material, the process cost and material cost are greatly reduced. In other embodiments, the outer surface of the second connecting portion 112 can also be a completely flush structure (not shown).

[0092] Specifically, the protrusion 1121 may extend beyond the inner surface of the cover plate 120, and the portion extending beyond the inner surface of the cover plate 120 is used for welding to the tab 311. In other embodiments, the protrusion 1121 may also be flush with or slightly lower than the inner surface of the cover plate 120. The inner surface of the cover plate 120 is the surface of the cover plate 120 facing the cell 310, and the outer surface is the surface of the cover plate 120 facing away from the cell 310.

[0093] Furthermore, in the battery cell assembly 300, at least two sets of battery cells 310 are arranged in a one-to-one correspondence with at least two second connecting parts 112, and the tabs 311 of each set of battery cells 310 are connected to the corresponding second connecting parts 112 by means of welding or other methods. Therefore, when electrically connecting the tabs 311 of the battery cell assembly 300 to the terminal post 110, the tabs 311 of each set of battery cells 310 can be directly welded to the corresponding second connecting parts 112, thus eliminating the need for adapter pieces.

[0094] Since the positive and negative tabs of the battery cell assembly 300 in this application are located on the same side, the cover plate 120 is provided with two spaced-apart poles 110 along its length. The two poles 110 are respectively used to weld to the positive and negative tabs of the battery cell assembly 300. Moreover, the battery cell assembly 300 includes two sets of battery cells 310, so there is one first connecting part 111 and two second connecting parts 112. The first connecting part 111 is disposed between the two second connecting parts 112, and the two second connecting parts 112 are respectively connected to the tabs 311 of the two sets of battery cells 310.

[0095] It should be noted that in other embodiments, depending on the number of groups of battery cells 310 in the battery cell assembly 300, the second connection portion 112 may also be provided in more than two ways. It should be clarified that the number of groups of battery cells 310 is not the same as the number of battery cells 310. For example, the battery cell assembly 300 may include four battery cells 310, where two battery cells 310 form one group, with their tabs 311 joined together to form a single tab 311, which is connected to one second connection portion 112; and the other two battery cells 310 form another group, with their tabs 311 joined together to form a single tab 311, which is connected to another second connection portion 112. In this case, the number of groups of battery cells 310 is 2, but the number of battery cells 310 is 4; the two are not the same.

[0096] The inventors discovered that the direct connection between the tab and the terminal in related technologies has the following problems: Since the tab is usually located on one side of the cell width direction, while the terminal is usually located in the middle of the cell width direction, and the distance between them is relatively large, the conventional approach to directly connect the terminal and the tab is to increase the length of the tab or the length of the bottom of the terminal. However, increasing the length of the tab increases tab redundancy, thereby increasing the risk of the tab being inserted backwards into the cell and the tab tearing; increasing the length of the bottom of the terminal increases the cost of the terminal. In the terminal 110 of this embodiment, the first connecting part 111 is connected between two adjacent second connecting parts 112, and the first connecting part 111 is installed on the outside of the cover plate 120. The second connecting parts 112 sink relative to the first connecting part 111 towards the inside of the housing 200 and extend from the first through hole 121 to the inside of the cover plate 120. Therefore, in this embodiment, the electrode post 110 places the second connecting portion 112 closer to the tab 311, eliminating the need to increase the length of the tab 311 and thus avoiding problems such as the tab 311 being inserted backwards into the battery cell 310 and the tab 311 tearing. Furthermore, compared to conventional solutions that increase the electrode post size, this embodiment only requires the same thickness of the original sheet metal as the first connecting portion 111 to form the electrode post 110. Therefore, the required original sheet metal thickness is reduced, thereby lowering the material cost of the electrode post 110.

[0097] Please refer to it again. Figure 3 and Figure 4 A first insulating element 130 is disposed between the electrode post 110 and the cover plate 120 to form insulation between the electrode post 110 and the cover plate 120. Specifically, the first insulating element 130 includes a first insulating portion 131, which is disposed between the first connecting portion 111 and the cover plate 120. The first insulating element 130 can be injection molded with the electrode post 110 first, and then assembled as a whole with the cover plate 120; alternatively, the electrode post 110 can be assembled with the cover plate 120 first, and then the first insulating element 130 can be integrally injection molded.

[0098] Specifically, in this embodiment, the first insulating member 130 further includes a second insulating portion 132, which is disposed between the second connecting portion 112 and the cover plate 120. The second insulating portion 132 can provide insulation between the second connecting portion 112 and the cover plate 120, and can also protect the second connecting portion 112 from corrosion. The first insulating member 130 covers the outer surface of the second connecting portion 112, which on the one hand increases the creepage distance from the outer surface of the second connecting portion 112 to the outer surface of the first connecting portion 111, and on the other hand increases the electrical clearance between the second connecting portion 112 and the electrical connector after welding the electrical connector. The outer surface of the second connecting portion 112 refers to the side of the second connecting portion 112 facing away from the battery cell 310, and this outer surface is used to contact the electrical connector. The electrode post 110 can be fixed to the cover plate 120 in various ways, such as injection molding. For example, in the first embodiment, nanopores are formed on the surfaces of the cover plate 120 and the electrode post 110, and part of the first insulating member 130 extends into the nanopores.

[0099] Before assembling the top cover assembly 100, the surfaces of the pole post 110 and the cover plate 120 are surface-treated to form nanopores. The pole post 110 is then assembled onto the cover plate 120 and nano-injection molded to obtain the first insulating component 130. Since the first insulating component 130 extends partially into the nanopores, it provides adhesive force to both the cover plate 120 and the pole post 110. That is, the pole post 110 is bonded and fixed to the cover plate 120 by the adhesive force provided by the first insulating component 130.

[0100] Specifically, in this embodiment, nanopores are formed on the surface of the first connecting portion 111 near the cover plate 120 and on the surface of the cover plate 120 near the first connecting portion 111. Therefore, the first insulating portion 131 can extend into the nanopores of the first connecting portion 111 and the cover plate 120 respectively, thereby playing a role in bonding and fixing between the first connecting portion 111 and the cover plate 120.

[0101] To ensure the pole post 110 is securely fixed, specifically in this embodiment, the bonding strength between the surface of the first connecting portion 111 near the cover plate 120 and the first insulating portion 131 is greater than or equal to 20 MPa. Furthermore, the bonding strength between the surface of the cover plate 120 near the first connecting portion 111 and the first insulating portion 131 is greater than or equal to 20 MPa.

[0102] Furthermore, in this embodiment, at least one of the first connecting portion 111 and the cover plate 120 is provided with a fourth groove 103. The fourth groove 103 on the first connecting portion 111 is located on the side of the first connecting portion 111 facing the cover plate 120, and the fourth groove 103 on the cover plate 120 is located on the side of the cover plate 120 facing the first connecting portion 111.

[0103] The first insulating part 131 can partially fill the fourth groove 103. Therefore, the fourth groove 103 can increase the contact area between the first insulating part 131 and the cover plate 120 and the first connecting part 111, thereby enhancing the adhesion between the first insulating part 130 and the cover plate 120 and the pole post 110, which helps to make the pole post 110 more firmly installed on the cover plate 120.

[0104] Furthermore, the fourth groove 103 narrows at least partially along the direction from the bottom to the opening. The fourth groove 103 may gradually narrow or narrow in a stepped manner. The fourth groove 103 has a structure that is wider at the bottom and narrower at the opening, so the portion of the first insulating part 131 filled in the fourth groove 103 will not easily fall out of the fourth groove 103, thereby enabling the first insulating part 131 to provide greater tension between the cover plate 120 and the pole post 110.

[0105] In this embodiment, the outer surface of the cover plate 120 is provided with a first stepped groove 104 surrounding the circumferential edge of the first through hole 121. At least one of the bottom wall and side wall of the first stepped groove 104 is formed with nanopores. Moreover, the second insulating portion 132 extends into the nanopores. That is, the second insulating portion 132 can also play a role in bonding and fixing the second connecting portion 112 and the cover plate 120, thereby further increasing the adhesion between the pole post 110 and the cover plate 120 and improving the firmness of the pole post 110 installation.

[0106] Moreover, while the first stepped groove 104 supports the second connecting part 112 to position the pole post 110, it can also increase the contact area between the cover plate 120 and the second insulating part 132, thereby further increasing the adhesion between the second connecting part 132 and the cover plate 120.

[0107] In addition, in this embodiment, the first insulating member 130 also includes a third insulating portion 133, which at least partially fills the space between the second connecting portion 112 and the inner wall of the first through hole 121.

[0108] The third insulating portion 133 is injection molded together with the first insulating portion 131 and the second insulating portion 132. Furthermore, the third insulating portion 133 fills the gap between the second connecting portion 112 and the inner wall of the first through hole 121, thereby providing a seal. That is, in this first embodiment, the sealing ring can be omitted, thereby reducing material costs and simplifying the assembly process. Specifically, the third insulating portion 133 at least partially fills the inner wall of the protrusion 1121 and the first through hole 121.

[0109] It should be noted that in other embodiments, a sealing ring may be provided between the inner wall of the second connecting portion 112 and the first through hole 121 instead of forming the third insulating portion 133. The structure of this sealing ring can refer to the structure of the sealing ring 140 in the following fourth to tenth embodiments, including a first sealing portion 141 and a second sealing portion 142. The first sealing portion 141 is sleeved on the protrusion 1121, and the second sealing portion 142 is pressed between the cover plate 120 and the second connecting portion 112. Both the first sealing portion 141 and the second sealing portion 142 can be deformed by compression, thereby providing a good sealing effect between the second connecting portion 112 and the first through hole 121.

[0110] Please see Figure 6 In the second embodiment, an integrally formed protrusion 122 is formed on the outer surface of the cover plate 120, the protrusion 122 extending circumferentially around the first through hole 121; and a second insulating portion 132 is disposed between the second connecting portion 112 and the protrusion 122, the second insulating portion 132 at least partially covering the protrusion 122.

[0111] The protrusion 122 can be formed simultaneously with the formation of the first stepped groove 104. Specifically, the material at the edge of the first through hole 121 can be pressed outwards, forming the first stepped groove 104 in the pressed area, while the material pressed outwards forms the protrusion 122. The protrusion 122 can increase the contact area between the second insulating part 132 and the cover plate 120, thereby further increasing the adhesion between the first insulating part 130 and the cover plate 120, and further improving the firmness of the installation of the pole post 110 and the cover plate 120.

[0112] More specifically, the surface of the protrusion 122 is formed with nanopores, and the second insulating portion 132 extends into the nanopores. Therefore, the connection between the second insulating portion 132 and the protrusion 122 is tighter.

[0113] Furthermore, in this second embodiment, the protrusion 122 is provided with at least one insertion hole (not shown), which penetrates the inner and outer surfaces of the protrusion 122, and the second insulating portion 132 is at least partially embedded in the insertion hole. The portion of the second insulating portion 132 located in the insertion hole can cooperate with the protrusion 122 to form a limiting position, so that the second insulating portion 132 maintains a stable relative position with respect to the protrusion 122, thereby enabling the first insulating member 130 to provide greater tensile force between the cover plate 120 and the pole post 110.

[0114] Please see Figure 7 In the third embodiment, the end of the protrusion 122 away from the cover plate 120 is bent toward the first through hole 121.

[0115] The bent portion of the protrusion 122 forms a bend 1221, making the protrusion 122 L-shaped overall, which further increases the contact area between the second insulating portion 132 and the cover plate 120. Moreover, the bend 1221 can also limit the second insulating portion 132 along the thickness direction of the cover plate 120, thereby enabling the first insulating member 130 to more reliably fix the pole post 110 to the cover plate 120.

[0116] The difference between the second and third embodiments described above and the first embodiment is that a protrusion 122 is formed on the cover plate 120. The remaining structure is exactly the same as that in the first embodiment, so it will not be described again here.

[0117] For example, please refer to Figure 24 , Figure 25 and Figure 26 In the tenth embodiment, a sixth groove 124 is further provided on the cover plate 120. The sixth groove 124 is provided in the thickness direction of the cover plate 120 and on the side of the cover plate 120 facing the second connecting portion 112. Moreover, at least a portion of the sixth groove 124 narrows in the direction from the bottom to the opening, and the second insulating portion 132 is partially filled in the sixth groove 124.

[0118] During the assembly of the top cover assembly 100, the pole post 110 is first assembled onto the cover plate 120, and then injection molding is performed to obtain the first insulating component 130. The first insulating component 130 can provide adhesive force to both the cover plate 120 and the pole post 110. That is, the pole post 110 is also bonded and fixed to the cover plate 120 by the adhesive force provided by the first insulating component 130. Since the cross-section of the sixth groove 124 is a structure that is narrow at the top and wide at the bottom, such as a trapezoid, the portion of the second insulating part 132 that fills the sixth groove 124 can cooperate with the sixth groove 124 to form a blocking structure, better fixing the first insulating component 130, thereby fixing the pole post 110 to the cover plate 120.

[0119] To further enhance the fastening effect, nanopores can also be provided on the surface of the sixth groove 124 wall of the cover plate 120 and on other surfaces of the cover plate 10 opposite to the first insulating member 130. Specifically, the sixth groove 124 can be partially (i.e., discontinuous) or entirely (i.e., continuous) surrounding the first through hole 121 to uniformly provide tension force to the fixed pole 110.

[0120] Specifically, in this tenth embodiment, a fourth groove 103 is provided on the cover plate 120, and the fourth groove 103 is located on the side of the cover plate 120 facing the first connecting portion 111. Moreover, similar to the sixth groove 124, at least a portion of the fourth groove 103 narrows in the direction from the bottom to the opening. The first insulating portion 131 partially fills the fourth groove 103, and the second insulating portion 132 partially fills the sixth groove 124, thereby cooperating with each other to better fix the first insulating member 130.

[0121] In addition to injection molding fixation, the pole post 110 and the cover plate 120 can also be fixed by clamping from both sides. For example, in some other embodiments, the top cover assembly 100 also includes a first fixing part 101 and a second fixing part 102. In the thickness direction of the cover plate 120, the second connecting part 112 is at least partially located between the first fixing part 101 and the second fixing part 102, and the projections of the first fixing part 101, the second connecting part 112, and the second fixing part 102 on the cover plate 120 at least partially overlap.

[0122] Therefore, the first fixing part 101 and the second fixing part 102 can respectively limit the second connecting part 112 from both sides along the thickness direction of the cover plate 120, thereby fixing the pole post 110 to the cover plate 120. That is, the pole post 110 will be fixed to the cover plate 120 under the joint clamping of the first fixing part 101 and the second fixing part 102.

[0123] More specifically, in some embodiments, at least one of the first fixing part 101 and the second fixing part 102 is integrally formed with the cover plate 120. This helps to reduce the number of parts and simplify the assembly process. For example:

[0124] Please see Figure 8 , Figure 9 and Figure 10 In the fourth embodiment, an integrally formed folding portion 123 is formed on the outer surface of the cover plate 120. The folding portion 123 extends circumferentially around the first through hole 121. At least a portion of the folding portion 123 extends to the side of the second connecting portion 112 away from the cover plate 120. The folding portion 123 is the first fixing portion 101, and the portion of the cover plate 120 located between the first through hole 121 and the folding portion 123 is the second fixing portion 102.

[0125] In other words, the second connecting portion 112 is clamped between the folded portion 123 and the outer surface of the cover plate 120, thereby fixing the pole post 110. The folded portion 123 can be formed in the same way as the protrusion 122 in the second embodiment.

[0126] In this fourth embodiment, after the first insulating member 130 and the terminal post 110 are injection molded, they are assembled as a whole with the cover plate 120 and held in place by the folding part 123. Of course, in other embodiments, the first insulating member 130 can also be molded in the same way as in the first embodiment while keeping other structures unchanged. That is, the terminal post 110 is first assembled onto the cover plate 120, and then the first insulating member 130 is integrally injection molded.

[0127] Furthermore, in this fourth embodiment, the top cover assembly 100 also includes a sealing ring 140, which includes a first sealing portion 141 and a second sealing portion 142. The first sealing portion 141 is sleeved on the protrusion 1121, and the second sealing portion 142 is pressed between the cover plate 120 and the second connecting portion 112. Both the first sealing portion 141 and the second sealing portion 142 can be deformed by compression, thereby providing a better sealing effect between the second connecting portion 112 and the first through hole 121.

[0128] In this fourth embodiment, the second fixing part 102, i.e., the portion of the cover plate 120 located between the first through hole 121 and the folding part 123, is flush with the inner surface of the cover plate 120. In other embodiments, to facilitate the extension of the second connecting part 112 toward the inner side of the cover plate 120, the second fixing part 102 may also be recessed relative to the outer surface of the cover plate 120.

[0129] like Figure 11 As shown, in the fifth embodiment, the second fixing part 102, i.e., the portion of the cover plate 120 located between the first through hole 121 and the folding part 123, protrudes from the inner surface of the cover plate 120 in a direction away from the first fixing part 101. This fifth embodiment is structurally similar to the fourth embodiment described above, except that its second fixing part 102 is recessed and protrudes from the inner surface of the cover plate 120.

[0130] Please refer to the following: Figure 12 , Figure 13 and Figure 14 In the sixth embodiment, the top cover assembly 100 further includes a first welding ring 150 extending circumferentially around the first through hole 121. The first welding ring 150 is welded to the outer surface of the cover plate 120 and at least a portion of the first welding ring 150 extends to the side of the second connecting portion 112 away from the cover plate 120. The first welding ring 150 is a first fixing portion 101, and the portion of the cover plate 120 located between the first through hole 121 and the first welding ring 150 is a second fixing portion 102.

[0131] In other words, the second connecting part 112 is clamped between the first welding ring 150 and the outer surface of the cover plate 120, thereby fixing the pole post 110. In this embodiment, the pole post 110 is first assembled onto the cover plate 120, then the first welding ring 150 is welded onto the cover plate 120, and then the first insulating part 130 is integrally injection molded.

[0132] In this way, the first insulating member 130, specifically the second insulating part 132, will at least partially cover the first welding ring 150, so an adhesive force will be generated between the second insulating part 132 and the first welding ring 150, thereby increasing the bonding strength between the first insulating member 130 and the cover plate 110, which helps to improve the firmness of the pole post 110.

[0133] Of course, in other embodiments, the first insulating member 130 and the pole post 110 can be injection molded and then assembled with the cover plate 120 as a whole, and finally the first welding ring 150 is welded and held by the first welding ring 150.

[0134] Please see Figure 15 , Figure 16 and Figure 17 In the seventh embodiment, the top cover assembly 100 further includes a second welding ring 160 extending circumferentially around the first through hole 121. The second welding ring 160 is welded to the outer surface of the cover plate 120 and at least a portion of the second welding ring 160 extends to the side of the second connecting portion 112 away from the cover plate 120. The second welding ring 160 is a first fixing portion 101, and the portion of the cover plate 120 located between the first through hole 121 and the second welding ring 160 is a second fixing portion 102.

[0135] The second welding ring 160 can have the same structure as the first welding ring 150 and be assembled with the cover plate 120 in the same way. It can be seen that the second connecting part 112 is clamped between the second welding ring 160 and the outer surface of the cover plate 120, thereby fixing the pole post 110.

[0136] Unlike the sixth embodiment, in this seventh embodiment, the outer surface of the cover plate 120 is also formed with an integrally formed folded portion 123. The folded portion 123 extends circumferentially around the first through hole 121 and presses at least a portion of the second welding ring 160 against the cover plate 120. The folded portion 123 has the same structure and forming method as the folded portion 123 in the fourth embodiment. However, in this seventh embodiment, the folded portion 123 does not directly press against the second connecting portion 112, but acts on the second welding ring 160 to enhance the supporting strength of the second welding ring 160.

[0137] Furthermore, in this seventh embodiment, the second insulating portion 132 is disposed between the second connecting portion 112 and the second welding ring 160, and the second insulating portion 132 at least partially covers the second welding ring 160. Thus, an adhesive force is generated between the second insulating portion 132 and the second welding ring 160, thereby increasing the bonding strength between the first insulating member 130 and the cover plate 110, which helps to improve the firmness of the pole post 110.

[0138] Please see Figure 18 , Figure 19 and Figure 20In the eighth embodiment, the top cover assembly 100 further includes a third welding ring 170 welded to the inner surface of the cover plate 120 and covering the first through hole 121. The third welding ring 170 has a second through hole 171 through which the second connecting portion 112 passes. An integrally formed folding portion 123 is formed on the outer surface of the cover plate 120. At least a portion of the folding portion 123 extends to the side of the second connecting portion 112 away from the cover plate 120. The folding portion 123 is the first fixing portion 101, and the third welding ring 170 is the second fixing portion 102.

[0139] In other words, the second connecting portion 112 is clamped between the folded portion 123 and the third welding ring 170, thereby fixing the pole post 110. Similarly, the folded portion 123 can adopt the same structure and forming method as the folded portion 123 in the fourth embodiment above.

[0140] Furthermore, in this eighth embodiment, a second stepped groove is formed on the inner surface of the cover plate 120 around the circumferential edge of the first through hole 121, and a third welding ring 170 is welded to at least one of the bottom wall and side wall of the second stepped groove.

[0141] The second stepped groove can position the third welding ring 170. Furthermore, the second stepped groove can accommodate the third welding ring 170, thereby reducing the height of the third welding ring 170 protruding from the inner surface of the cover plate 120. Optionally, the third welding ring 170 is flush with the inner surface of the cover plate 120. This avoids occupying space in the height direction of the housing 200 due to the placement of the third welding ring 170, helping to ensure the energy density of the battery cell 10.

[0142] Furthermore, in some other embodiments, neither the first fixing part 101 nor the second fixing part 102 may be integrally formed with the cover plate 120. For example:

[0143] Please see Figure 21 , Figure 22 and Figure 23 In the ninth embodiment, the top cover assembly 100 further includes a fourth welding ring 180. The fourth welding ring 180 includes a base plate 181 and a flange 182. The base plate 181 is welded to the inner surface of the cover plate 120 and covers the first through hole 121. The base plate 181 has a third through hole 1811 through which the second connecting portion 112 passes. One end of the flange 182 is connected to the base plate 181, and the other end of the flange 182 extends to the side of the second connecting portion 112 away from the cover plate 120. The flange 182 serves as a first fixing portion 101, and the base plate 181 serves as a second fixing portion 102.

[0144] The fourth welding ring 180 is welded to the cover plate 120, and the second connecting part 112 is clamped between the base plate 181 and the folded edge 182. Therefore, the pole post 110 is fixed to the cover plate 120 through the fourth welding ring 180. It can be seen that, unlike the fourth to eighth embodiments, the first fixing part 101 and the second fixing part 102 in this ninth embodiment are not located on the cover plate 120.

[0145] Furthermore, in this ninth embodiment, the inner surface of the cover plate 120 is formed with a third stepped groove disposed around the circumferential edge of the first through hole 121, and the bottom plate 181 is welded to at least one of the bottom wall and side wall of the third stepped groove.

[0146] The third stepped groove positions the base plate 181, facilitating the installation of the fourth welding ring 180. Similarly, the third stepped groove also accommodates the base plate 181, reducing the height of the base plate 181 protruding from the inner surface of the cover plate 120. Optionally, the base plate 181 is flush with the inner surface of the cover plate 120. This avoids occupying space in the height direction of the housing 200 due to the installation of the fourth welding ring 180, helping to ensure the energy density of the battery cell 10.

[0147] It should be noted that in the fourth to ninth embodiments described above, the pole post 110 is fixed to the cover plate 120 by means of clamping with the first fixing part 101 and the second fixing part 102. The difference lies in the specific form of the first fixing part 101 and the second fixing part 102. Moreover, the difference between the fourth to ninth embodiments and the first to third embodiments and the tenth embodiment is only in the fixing method of the pole post 110 and the cover plate 120.

[0148] Therefore, the structures of other features in the first to tenth embodiments, such as the pole post 110 and the first insulating member 130, can be completely identical, and the features can be combined with each other without contradicting each other.

[0149] In the aforementioned top cover assembly 100 and battery cell 10, at least two second connecting portions 112 of the terminal post 110 are spaced apart along the width direction of the cover plate 120, i.e., the thickness direction of the housing 200. Therefore, the tabs 311 extending from at least two cells 310 in the cell assembly 300 correspond to the positions of at least two second connecting portions 112. When welding the terminal post 110 to the cell assembly 300, the tab 311 of each cell 310 can be directly welded to the corresponding second connecting portion 112, thereby omitting the adapter piece. The first insulating member 130, while providing insulation, also provides a better limiting effect for the terminal post 110. Moreover, in the assembly method where the terminal post 110 is assembled on the cover plate 120 and then integrally injection molded to obtain the first insulating member 130, the plastic material used to mold the first insulating member 130 can effectively fill the gap between the terminal post 110 and the cover plate 120. Therefore, the aforementioned top cover assembly 100 and battery cell 10 can ensure reliability without omitting the adapter piece.

[0150] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0151] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A top cover assembly, characterized in that, include: The cover plate has a first through hole; A pole post includes at least one first connecting portion and at least two second connecting portions. The first connecting portion is used to connect an electrical connector, and the second connecting portions are used to connect an electrode tab. The first connecting portion is located on the outside of the cover plate. At least two second connecting portions are spaced apart along the width direction of the cover plate, and a first connecting portion connects adjacent two second connecting portions. Each second connecting portion extends from the first through hole toward the inside of the cover plate. A first insulating element is disposed between the pole post and the cover plate. The first insulating element includes a first insulating portion, which is disposed between the first connecting portion and the cover plate.

2. The top cover assembly according to claim 1, characterized in that, There is one first connecting part and two second connecting parts, with the first connecting part disposed between the two second connecting parts; And / or, each of the second connecting portions extends from the first through hole toward the inside of the cover plate to beyond the inner surface of the cover plate.

3. The top cover assembly according to claim 1, characterized in that, The surfaces of the cover plate and the pole are formed with nanopores, and the first insulating part extends into the nanopores.

4. The top cover assembly according to claim 3, characterized in that, The first connecting portion near the surface of the cover plate and the cover plate near the first connecting portion are formed with the nanopores.

5. The top cover assembly according to claim 4, characterized in that, The bonding strength between the surface of the first connecting portion near the cover plate and the first insulating portion is greater than or equal to 20 MPa; And / or, the bonding strength between the surface of the cover plate near the first connecting portion and the first insulating portion is greater than or equal to 20 MPa.

6. The top cover assembly according to claim 3, characterized in that, The outer surface of the cover plate is provided with a first stepped groove surrounding the circumferential edge of the first through hole, and the nanopores are formed on the bottom wall and / or side wall of the first stepped groove; the first insulating member further includes a second insulating part, which is disposed between the second connecting part and the cover plate, and the second insulating part extends into the nanopores.

7. The top cover assembly according to claim 3, characterized in that, The outer surface of the cover plate has an integrally formed protrusion that extends circumferentially around the first through hole; the first insulating member also includes a second insulating portion disposed between the second connecting portion and the protrusion, and the second insulating portion at least partially covers the protrusion.

8. The top cover assembly according to claim 7, characterized in that, The surface of the protrusion is formed with the nanopores, and the second insulating portion extends into the nanopores.

9. The top cover assembly according to claim 7, characterized in that, The end of the protrusion away from the cover plate is bent toward the first through hole.

10. The top cover assembly according to claim 7, characterized in that, The protrusion is provided with at least one embedding hole, the embedding hole penetrating the inner and outer surfaces of the protrusion, and the second insulating part is at least partially embedded in the embedding hole.

11. The top cover assembly according to claim 3, characterized in that, The first insulating member further includes a third insulating portion, which at least partially fills the space between the second connecting portion and the inner wall of the first through hole.

12. The top cover assembly according to claim 1, characterized in that, The top cover assembly further includes a first fixing part and a second fixing part. In the thickness direction of the cover plate, the second connecting part is at least partially located between the first fixing part and the second fixing part, and the projections of the first fixing part, the second connecting part, and the second fixing part on the cover plate at least partially overlap.

13. The top cover assembly according to claim 12, characterized in that, At least one of the first fixing part and the second fixing part is integrally formed with the cover plate.

14. The top cover assembly according to claim 13, characterized in that, The outer surface of the cover plate has an integrally formed folded portion that extends circumferentially around the first through hole. At least a portion of the folded portion extends to the side of the second connecting portion away from the cover plate. The folded portion is the first fixing portion, and the portion of the cover plate located between the first through hole and the folded portion is the second fixing portion.

15. The top cover assembly according to claim 14, characterized in that, The second fixing part protrudes from the inner surface of the cover plate in a direction opposite to the first fixing part.

16. The top cover assembly according to claim 13, characterized in that, The top cover assembly further includes a first welding ring extending circumferentially around the first through hole, the first welding ring being welded to the outer surface of the cover plate and at least a portion of the first welding ring extending to the side of the second connection portion away from the cover plate, the first welding ring being the first fixing portion, and the portion of the cover plate located between the first through hole and the first welding ring being the second fixing portion.

17. The top cover assembly according to claim 16, characterized in that, The first insulating member further includes a second insulating portion disposed between the second connecting portion and the first welding ring, and the second insulating portion at least partially covers the first welding ring.

18. The top cover assembly according to claim 13, characterized in that, The top cover assembly further includes a second welding ring extending circumferentially around the first through hole. The second welding ring is welded to the outer surface of the cover plate, and at least a portion of the second welding ring extends to the side of the second connection portion away from the cover plate. The second welding ring is the first fixing portion, and the portion of the cover plate located between the first through hole and the second welding ring is the second fixing portion. An integrally formed folded portion is formed on the outer surface of the cover plate. The folded portion extends circumferentially around the first through hole and presses at least a portion of the second welding ring onto the cover plate.

19. The top cover assembly according to claim 18, characterized in that, The first insulating member further includes a second insulating portion disposed between the second connecting portion and the second welding ring, wherein the second insulating portion at least partially covers the second welding ring.

20. The top cover assembly according to claim 13, characterized in that, The top cover assembly further includes a third welding ring welded to the inner surface of the cover plate and covering the first through hole. The third welding ring has a second through hole through which the second connecting portion passes. An integrally formed folded portion is formed on the outer surface of the cover plate. At least a portion of the folded portion extends to the side of the second connecting portion away from the cover plate. The folded portion is the first fixing portion, and the third welding ring is the second fixing portion.

21. The top cover assembly according to claim 20, characterized in that, The inner surface of the cover plate is formed with a second stepped groove around the circumferential edge of the first through hole, and the third welding ring is welded to the bottom wall and / or side wall of the second stepped groove.

22. The top cover assembly according to claim 12, characterized in that, The top cover assembly further includes a fourth welding ring, which includes a base plate and a folded edge. The base plate is welded to the inner surface of the cover plate and covers the first through hole. The base plate has a third through hole through which the second connecting part passes. One end of the folded edge is connected to the base plate, and the other end of the folded edge extends to the side of the second connecting part away from the cover plate. The folded edge is the first fixing part, and the base plate is the second fixing part.

23. The top cover assembly according to claim 22, characterized in that, The inner surface of the cover plate is formed with a third stepped groove surrounding the circumferential edge of the first through hole, and the bottom plate is welded to the bottom wall and / or side wall of the third stepped groove.

24. The top cover assembly according to any one of claims 1 to 23, characterized in that, The middle part of the second connecting part is recessed towards the inside of the cover plate to form a fifth groove on the outer surface of the second connecting part and a protrusion on the inner surface of the second connecting part. The protrusion extends from the first through hole towards the inside of the cover plate.

25. The top cover assembly according to claim 24, characterized in that, The top cover assembly also includes a sealing ring, which includes a first sealing portion and a second sealing portion. The first sealing portion is located between the protrusion and the inner wall of the first through hole, and the second sealing portion is located between the second connecting portion and the cover plate.

26. The top cover assembly according to claim 1, characterized in that, A fourth groove is formed on the side of the first connecting portion facing the cover plate and / or on the side of the cover plate facing the first connecting portion. The fourth groove narrows at least partially in the direction from the bottom to the opening, and the first insulating portion partially fills the fourth groove.

27. The top cover assembly according to claim 26, characterized in that, The first insulating member further includes a second insulating portion disposed between the second connecting portion and the cover plate. The cover plate is provided with a sixth groove, which at least partially narrows in the direction from the bottom to the opening, and the second insulating portion partially fills the sixth groove.

28. The top cover assembly according to claim 27, characterized in that, The sixth groove is at least partially disposed around the first through hole.

29. The top cover assembly according to claim 27, characterized in that, The sixth groove is not discontinuous.

30. A single battery cell, characterized in that, The device includes a housing, a battery cell assembly, and a top cover assembly as described in any one of claims 1 to 29; the housing has an opening at at least one end, the battery cell assembly is housed within the housing, and the top cover assembly covers the opening; the battery cell assembly includes at least two sets of battery cells arranged side by side along the thickness direction of the housing, and the at least two sets of battery cells are correspondingly arranged with at least two second connecting portions, each set of battery cells extends out a tab, and the tab of each set of battery cells is respectively connected to the corresponding second connecting portion.

31. A battery, characterized in that, It includes a plurality of battery cells as described in claim 30 above, the plurality of battery cells being electrically connected by an electrical connector, and the electrical connector being connected to the first connection portion.

32. An electrical appliance, characterized in that, Includes the battery cell as described in claim 30 or the battery as described in claim 31.

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