Top cover, assembly method of top cover, battery monomer and battery pack

Abstract

The invention provides a top cover, an assembly method of the top cover, a battery monomer and a battery pack. The top cover comprises a pole and a top cover body, the pole comprises a pole body, a terminal and a riveting part; the first end of the column body is connected with the riveting part, and the second end of the column body is connected with the terminal; the top cover body is provided with a through hole; the column body penetrates through the through hole of the top cover body; the terminal is located on one side of the top cover body, and the riveting part is located on the other side of the top cover body and attached to the edge of the through hole. Wherein the terminal is used for being connected with an external conductive piece; the first end of the column body is used for connecting a tab of a battery cell; according to the top cover, the riveting part at one end, far away from the terminal, of the pole is riveted with the top cover body, so that a riveting block required for assembling the pole and the top cover body originally is omitted, and the welding area between the pole and an external conductive piece is increased, so that the conductive piece outside the battery can bear higher current.

Description

Technical Field

[0001] This application relates to the field of new energy technology, specifically to a top cover, a method for assembling the top cover, a battery cell, and a battery pack. Background Technology

[0002] Battery cells are typically connected to external conductive components, such as electrodes, via terminals on a top cover. In commonly used top covers, the terminals are usually riveted to the top cover body using a riveting block. However, the area where the riveting block is attached to the terminal cannot be used to weld external conductive components like electrodes. This means the welding area between the external conductive components and the terminals is too small. Consequently, the current that the external conductive components can carry is relatively low, thus limiting the usability of individual battery cells.

[0003] In other words, the top cover commonly used at present cannot meet the requirements of high overcurrent when applied to individual battery cells. Summary of the Invention

[0004] The purpose of this application is to provide a top cover, a method for assembling the top cover, a battery cell, and a battery pack. The top cover body is riveted together with a riveting part on the end of the terminal away from the terminal, eliminating the riveting block originally required for assembling the terminal and the top cover body. This increases the welding area between the terminal and the external conductive parts, thereby enabling the external conductive parts of the battery to carry higher current.

[0005] In a first aspect, this application provides a top cover, including a terminal post and a top cover body; the terminal post includes a column, a terminal, and a riveting part; a first end of the column is connected to the riveting part, and a second end of the column is connected to the terminal; the top cover body is provided with a through hole; the column passes through the through hole of the top cover body; the terminal is located on one side of the top cover body, and the riveting part is located on the other side of the top cover body and fits against the edge of the through hole; wherein, the terminal is used to connect to an external conductive component; the first end of the column is used to connect to the tab of a battery cell.

[0006] The aforementioned top cover is riveted to the top cover body via a riveting part on the end of the terminal away from the terminal, eliminating the need for the riveting blocks originally required for assembly between the terminal and the top cover body. This allows almost the entire terminal to be welded to external conductive components, increasing the welding area between the terminal and external conductive components. Consequently, the external conductive components of the battery can carry higher currents, meeting the requirements for high overcurrent applications. Furthermore, compared to friction welding, this method reduces costs and lowers the risk of copper-aluminum friction-welded terminals breaking under external impact, thus improving the structural reliability of the top cover.

[0007] In conjunction with the first aspect, optionally, the riveting portion includes a flange extending radially outward along the column.

[0008] The aforementioned top cover specifies the riveting part as a radial flange, which simplifies the structure, facilitates processing and forming, and improves the stability of the riveting by increasing the contact area.

[0009] In conjunction with the first aspect, optionally, a recessed portion is provided at the connection between the flange and the column; the recessed portion is recessed along the recessed direction; wherein, the recessed direction includes the direction from the first end of the column toward the second end of the column.

[0010] In the aforementioned top cover, before the column passes through the top cover body, the flange can extend along the side of the column. After the column passes through the top cover body, the flange is folded towards the top cover body to achieve riveting. The recessed design allows stress to concentrate more easily in the recessed area during the folding process, resulting in a more regular flange shape after folding. This increases the contact area between the flange and the top cover body, further improving the stability of the riveting.

[0011] In conjunction with the first aspect, optionally, the outer edge of the riveted portion is welded to the other side of the top cover body.

[0012] The aforementioned top cover, after being fixed to the top cover body by riveting, is further welded through the area where the outer edge of the riveting part contacts the top cover body. This combination of mechanical fixing and welding further improves the connection strength between the terminal post and the top cover body, and also improves the sealing performance, effectively preventing problems such as loosening of the connection or electrolyte leakage caused by vibration, impact, etc., thereby improving the safety and service life of the battery cell.

[0013] In conjunction with the first aspect, optionally, the projection of the column is located within the projection of the terminal on the same projection plane perpendicular to the axis of the column.

[0014] The aforementioned top cover, through the design of a larger terminal area, further increases the welding area between the terminal post and the external conductive parts, thereby further improving the maximum current that the external conductive parts of the battery can carry, and better meeting the requirements of high overcurrent applications.

[0015] In conjunction with the first aspect, optionally, the material of the column is different from the material of the terminal; the column and the terminal are pressed together.

[0016] In the case of the top cover being made of different materials than the terminals, a high-strength, low-resistance connection between dissimilar metals is achieved through an integral pressing molding technology, avoiding problems such as fragile heat-affected zones, interface oxidation, and high costs that may exist in traditional friction welding.

[0017] In conjunction with the first aspect, optionally, the material of the column is the same as the material of the terminal; the column and the terminal are integrally formed.

[0018] With the top cover made of the same material as the terminal, the one-piece molding of the same material simplifies the manufacturing process, avoids potential failure risks at the connection interface, and improves the structural strength of the electrode post. Furthermore, it also improves the conductivity of the electrode post.

[0019] In conjunction with the first aspect, optionally, the top cover body includes an upper plastic component, a substrate, a lower plastic component, and a pole base; the upper plastic component is located on the side of the substrate facing the terminal and is connected to the substrate; the lower plastic component is located on the side of the substrate facing the riveting portion and is connected to the substrate; the pole base is located on the side of the lower plastic component facing away from the substrate and is connected to the lower plastic component; the pole penetrates through the upper plastic component, the substrate, the lower plastic component, and the pole base; the terminal is located on the side of the upper plastic component facing away from the substrate, and the riveting portion is located on the side of the pole base facing away from the base and fits against the edge of the through hole provided on the pole base.

[0020] The aforementioned top cover, through its layered design of upper plastic parts, substrate, lower plastic parts, and pole base, not only provides support and fixation for the pole but also better ensures electrical insulation between the pole and the substrate.

[0021] In conjunction with the first aspect, optionally, the top cover body further includes a sealing ring; the sealing ring is sleeved on the column and passes through the substrate and the lower plastic part; the sealing ring is located between the upper plastic part and the pole base.

[0022] The aforementioned top cover, through the setting of the sealing ring, effectively fills the gap between the terminal post and the surrounding components, thereby effectively preventing the electrolyte inside the battery from leaking outward along the terminal post, and also blocking external contaminants from entering the battery, thus further improving battery safety and service life.

[0023] Secondly, this application provides a method for assembling a top cover, wherein the top cover includes a top cover body and a pole post; the method includes: aligning the riveting portion of the pole post toward the top cover body; penetrating the pole post through a through hole in the top cover body; and, with the terminal of the pole post in contact with one side of the top cover, controlling a riveting machine to apply a riveting force to the riveting portion of the pole post until the riveting portion is fitted against the edge of the through hole on the other side of the top cover body.

[0024] The assembly method of the top cover can have the same beneficial effects as the top cover described in the first aspect or any optional embodiment of the first aspect. In addition, the assembly method of the top cover provided in this application is easy to automate production. By controlling the riveting process parameters, the consistency and reliability of the product can be guaranteed, thereby effectively improving production efficiency and product quality.

[0025] Thirdly, this application provides a battery cell, including a battery cell and a top cover as described above; the top cover is mounted on the end of the battery cell; the tabs of the battery cell are electrically connected to the terminals of the top cover.

[0026] The aforementioned battery cell may have the same beneficial effects as the top cover described in the first aspect or any optional embodiment of the first aspect, which will not be repeated here.

[0027] Fourthly, this application provides a battery pack comprising at least two battery cells as described above.

[0028] The battery pack described above may have the same beneficial effects as the battery cell described in the first aspect or any alternative embodiment of the first aspect, which will not be repeated here.

[0029] In summary, the top cover, its assembly method, battery cell, and battery pack provided in this application are riveted to the top cover body via a riveting part on the end of the terminal away from the terminal. This eliminates the need for the riveting blocks originally required for assembling the terminal and the top cover body, increasing the welding area between the terminal and the external conductive components. This allows the external conductive components to carry higher currents. Compared to friction welding, this reduces costs and lowers the risk of copper-aluminum friction-welded terminals breaking under external impact, thus improving the structural reliability of the top cover. The recessed design allows stress to concentrate more easily in the recessed area during folding, resulting in a more regular flange shape after folding. This increases the contact area between the flange and the top cover body, further improving the stability of the riveting. Based on the riveting of the riveted part to the top cover body, welding is then performed on the area where the outer edge of the riveted part contacts the top cover body. This further improves the connection strength between the pole and the top cover body and also enhances the sealing performance. This effectively prevents problems such as loosening of the connection or leakage of electrolyte caused by vibration, impact, etc., thereby improving the safety and service life of the battery cell. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A perspective view of the top cover provided in the first embodiment of this application; Figure 2 An exploded view of the top cover provided in the first embodiment of this application; Figure 3 Bottom view of the top cover provided for the first embodiment of this application; Figure 4 A top view of the cover provided in the first embodiment of this application; Figure 5 for Figure 4 Sectional view at point AA; Figure 6 for Figure 5 A magnified view of a section at point A in the middle; Figure 7 A perspective view of the top cover provided in the second embodiment of this application; Figure 8 An exploded view of the top cover provided in the second embodiment of this application; Figure 9 Bottom view of the top cover provided in the second embodiment of this application; Figure 10 A top view of the cover provided in the second embodiment of this application; Figure 11 for Figure 10 Sectional view at point AA; Figure 12 for Figure 11 A magnified view of a section at point B in the middle; Figure 13 A flowchart illustrating the assembly method of the top cover provided in this application embodiment; Figure 14 This is a perspective view of a battery cell provided in an embodiment of this application.

[0032] Icons: 100, Top cover; 110, Terminal post; 111, Post; 112, Terminal; 113, Rivet part; 114, Recessed part; 120, Top cover body; 121, Upper plastic part; 122, Substrate; 123, Lower plastic part; 124, Terminal post base; 125, Sealing ring; 10, Battery cell; 200, Battery cell. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] Taking a short-cell battery with a length of 350-650mm as an example, to accommodate the high voltage of the entire battery pack, the cell thickness is generally no more than 28mm. Due to space constraints in the cell thickness direction, the negative electrode top cover post can only be produced by friction welding. With friction welding, the copper-aluminum interface of the post can experience fluctuations in contact resistance or even breakage under external vibrations and impacts. The smaller the diameter of the post, the greater the risk of breakage. More importantly, this risk cannot be detected during the post production process, and the cost of posts produced by friction welding is also higher. Furthermore, the friction-welded post must be riveted to a riveting block. The part where the riveting block is riveted to the post cannot be welded with a battery pack. To ensure the battery pack can handle the current, the riveting block needs to be longer. However, within the limited length of the top cover, an explosion-proof valve, a liquid injection hole, and space for a QR code need to be included, which in turn limits the length of the riveting block. Therefore, the final structure of the friction welding combined with riveting process cannot meet the high-current charging requirements.

[0040] In view of this, this application provides a top cover, a method for assembling the top cover, a battery cell, and a battery pack to solve the above-mentioned technical problems. Specifically, please refer to the embodiments and accompanying drawings provided in this application.

[0041] Please refer to Figures 1 to 2 ,or Figures 7 to 8 , Figure 1 This is a perspective view of the top cover 100 provided in the first embodiment of this application; Figure 2 This is an exploded view of the top cover 100 provided in the first embodiment of this application; Figure 7 This is a perspective view of the top cover 100 provided in the second embodiment of this application; Figure 8 This is an exploded view of the top cover 100 provided in the second embodiment of this application. The top cover 100 provided in this embodiment includes a terminal post 110 and a top cover 100 body. The terminal post 110 is typically used for conducting electricity, and the top cover 100 body is used for supporting and sealing the battery cell 200, etc. The top cover 100 body can be a composite structure assembled from multiple components, such as a substrate 122, insulating components, etc.

[0042] The pole post 110 includes a pole body 111, a terminal 112, and a riveting part 113. The first end of the pole body 111 is connected to the riveting part 113, and the second end of the pole body 111 is connected to the terminal 112. The pole body 111, the terminal 112, and the riveting part 113 can be an inseparable whole formed from the same blank through processing; or, the pole body 111 and the terminal 112 can be integrally formed first, and the riveting part 113 is connected to the end of the pole body 111 as a separate component; or, the three are initially separate components and are assembled into the pole post 110 by welding, stamping, forging, or other methods.

[0043] The top cover 100 body has a through hole. The column 111 passes through the through hole of the top cover 100 body. The cross-sectional shape of the through hole can match the cross-sectional shape of the column 111, such as circular, square, polygonal, etc., with a certain assembly gap. The through hole can sequentially pass through a multi-layer structure composed of different components in the top cover 100 body, such as: metal substrate 122, plastic insulating parts, etc.

[0044] Terminal 112 is located on one side of the top cover 100 body, and riveting part 113 is located on the other side of the top cover 100 body, fitting against the edge of the through hole. Terminal 112 can completely cover the opening of the through hole on that side, or it can partially cover the opening. Riveting part 113 can achieve fitting and fixation with the edge of the through hole through deformation of its own structure, for example, by flanging. Riveting part 113 can also achieve fitting and fixation by pressing its edge beyond the pole post 110. Terminal 112 is used to connect to external conductive components. The first end of the post 111 is used to connect to the electrode tab of the battery cell 200. The connection method between terminal 112 and external conductive components can be welding methods such as laser welding and ultrasonic welding, bolt connection, or elastic snap connection. The connection method between the first end of post 111 and the electrode tab of battery cell 200 can be welding, ultrasonic welding, or bonding with conductive adhesive.

[0045] In the above implementation process, the riveting part 113 on the end of the terminal 110 away from the terminal 112 is riveted to the body of the top cover 100, eliminating the riveting block originally required for assembling the terminal 110 and the body of the top cover 100. This allows almost the entire terminal 112 to be welded to external conductive parts, increasing the welding area between the terminal 110 and the external conductive parts. This enables the external conductive parts of the battery to carry higher currents, meeting the requirements for high overcurrent applications. Furthermore, compared to friction welding, this method reduces costs and lowers the risk of the copper-aluminum friction-welded terminal 110 breaking under external impact, thereby improving the structural reliability of the top cover 100.

[0046] Please continue to refer to Figures 1 to 2 ,or Figures 7 to 8 In some alternative embodiments, the riveting portion 113 includes a flange extending radially outward along the column 111. The flange can be a continuous annular flange symmetrical about the axis of the column 111, or a discontinuous flange composed of multiple arc segments or protrusions. The cross-sectional shape of the flange can be rectangular, trapezoidal, arc-shaped, or a combination thereof.

[0047] In the above implementation process, the riveting part 113 is specifically designed as a radial flange, which simplifies the structure, facilitates processing and forming, and improves the stability of the riveting by increasing the contact area.

[0048] Please refer to the reference. Figures 3 to 6 ,or Figure 9 Figure 12 , Figure 3 This is a bottom view of the top cover 100 provided in the first embodiment of this application; Figure 4 This is a top view of the top cover 100 provided in the first embodiment of this application; Figure 5 yes Figure 4 Sectional view at point AA; Figure 6 yes Figure 5 A magnified view of a section at point A in the middle; Figure 9 This is a bottom view of the top cover 100 provided in the second embodiment of this application; Figure 10 A top view of the top cover 100 provided in the second embodiment of this application; Figure 11 yes Figure 10 Sectional view at point AA; Figure 12 yes Figure 11 A magnified view of a portion at point B. In some alternative embodiments, a recess 114 is provided at the connection between the flange and the column 111. The recess 114 can be an annular groove surrounding the column 111, or it can be composed of multiple partial pits. The cross-sectional shape of the recess 114 can be V-shaped, U-shaped, or arc-shaped, etc.

[0049] The recessed portion 114 is recessed along a recessed direction. This recessed direction includes the direction from the first end of the column 111 toward the second end of the column 111. The recessed direction can be approximately parallel to the axis of the column 111, or it can form an acute angle with the axis. The depth of the recess can be uniform or varied.

[0050] In the above implementation process, before the column 111 passes through the top cover 100 body, the flange can extend along the side of the column 111. After the column 111 passes through the top cover 100 body, the flange is folded towards the top cover 100 body to achieve riveting. The design of the recessed portion 114 makes it easier for stress to concentrate in the recessed portion 114 area during the folding process, resulting in a more regular flange shape after folding. This increases the contact area between the flange and the top cover 100 body, further improving the stability of the riveting.

[0051] Please continue to refer to Figure 6 or Figure 12 In some alternative embodiments, the outer edge of the riveted portion 113 is welded to the other side of the top cover 100 body. The welding method can be laser welding, resistance welding, or electron beam welding, etc. The weld bead can be continuous around the outer edge of the riveted portion 113, or it can be intermittent spot welding or segment welding, etc.

[0052] In the above-described process, based on the riveting of the riveting part 113 to the top cover 100 body, welding is then performed on the area where the outer edge of the riveting part 113 contacts the top cover 100 body. This combination of mechanical fixing and welding further improves the connection strength between the terminal post 110 and the top cover 100 body, and also improves the sealing performance, effectively preventing problems such as loosening of the connection or electrolyte leakage caused by vibration, impact, etc., thereby improving the safety and service life of the battery cell 10.

[0053] Please continue to refer to Figure 2 or Figure 8 In some alternative embodiments, on the same projection plane perpendicular to the axis of the column 111, the projection of the column 111 lies within the projection of the terminal 112. The terminal 112 can be a rectangular plate, a disk, or any other shape with an area much larger than the cross-sectional area of ​​the column 111. The column 111 can be located at the geometric center of the projection of the terminal 112, or it can be offset to one side, as long as its projection is completely covered by the projection of the terminal 112.

[0054] In the above implementation process, the design of a larger terminal 112 further increases the welding area between the terminal 110 and the external conductive parts, thereby further improving the maximum current that the external conductive parts of the battery can carry and better meeting the requirements of high overcurrent applications.

[0055] Please continue to refer to Figures 7 to 12 In some alternative embodiments, the material of the pillar 111 is different from that of the terminal 112. The pillar 111 and the terminal 112 are formed by pressing. The pillar 111 may be made of copper or a copper alloy, and the terminal 112 may be made of aluminum or an aluminum alloy. The pressing process causes plastic deformation and solid-state atomic diffusion at the interface between the two metals, forming a strong metallurgical bond. The pressing can be performed at room temperature or under appropriate heating conditions.

[0056] Optionally, the electrode post 110 in this embodiment can specifically serve as the negative electrode post. In other words, the top cover 100 in this embodiment can serve as the negative electrode top cover 100.

[0057] In the above process, when the material of the body is different from that of the terminal 112, the high-strength, low-resistance connection of dissimilar metals is achieved by the upsetting integral molding technology, avoiding the problems of fragile heat-affected zone, interface oxidation and high cost that may exist in traditional friction welding.

[0058] Please continue to refer to Figures 1 to 6In some alternative embodiments, the material of the pillar 111 is the same as that of the terminal 112. The pillar 111 and the terminal 112 are integrally formed. The pillar 111 and the terminal 112 can both be made of aluminum or aluminum alloy by forging, precision casting or integral machining into a single part.

[0059] Optionally, the electrode post 110 in this embodiment can specifically serve as the positive electrode post. In other words, the top cover 100 in this embodiment can serve as the positive electrode top cover 100.

[0060] In the above implementation process, when the material of the post 111 and the terminal 112 are the same, the integral molding of the same material simplifies the manufacturing process, avoids the potential failure risk of the connection interface, and improves the structural strength of the post 110. Furthermore, it also improves the conductivity of the post 110.

[0061] Please continue to refer to Figure 2 or Figure 7 In some optional embodiments, the top cover 100 body includes an upper plastic component 121, a substrate 122, a lower plastic component 123, and a base for a pole post 110. The upper plastic component 121 is located on the side of the substrate 122 facing the terminal 112 and is connected to the substrate 122. The lower plastic component 123 is located on the side of the substrate 122 facing the riveting portion 113 and is connected to the substrate 122. The base for the pole post 110 is located on the side of the lower plastic component 123 facing away from the substrate 122 and is connected to the lower plastic component 123. The post 111 passes through the upper plastic component 121, the substrate 122, the lower plastic component 123, and the base for the pole post 110. The terminal 112 is located on the side of the upper plastic component 121 facing away from the substrate 122, and the riveting portion 113 is located on the side of the base for the pole post 110 facing away from the base and fits against the edge of the through hole provided on the base for the pole post 110.

[0062] The substrate 122 can specifically be an aluminum plate. Correspondingly, the upper plastic part 121 and the lower plastic part 123 can be bonded to the substrate 122 by injection molding or bonding. The base of the pole post 110 can be snapped onto or bonded to the lower plastic part 123. Through holes are provided in the plastic parts, substrate 122, lower plastic part 123, and base of the pole post 110, and the through holes in each layer are interconnected. In a preferred embodiment, the through holes in each layer can be coaxially aligned.

[0063] In the above implementation process, the upper plastic part 121, the substrate 122, the lower plastic part 123 and the base of the pole post 110, through the layered design, not only provide support and fixation for the pole post 110, but also better ensure the electrical insulation between the pole post 110 and the substrate 122.

[0064] Please continue to refer to Figure 2 or Figure 7In some alternative embodiments, the top cover 100 body also includes a sealing ring 125. The sealing ring 125 is sleeved on the post 111 and passes through the substrate 122 and the lower plastic part 123. The sealing ring 125 is located between the upper plastic part 121 and the base of the pole post 110.

[0065] The sealing ring 125 can be made of elastic materials such as rubber, silicone, or plastic, and its cross-section can be circular, rectangular, or other shapes. The sealing ring 125 can be compressed and filled into the annular space formed by the through hole of the substrate 122, the lower plastic part 123, and the pole post 110.

[0066] In the above process, the sealing ring 125 effectively fills the gap between the terminal post 110 and the surrounding components, thereby effectively preventing the electrolyte inside the battery from leaking outward along the terminal post 110, and also blocking external contaminants from entering the battery, thereby further improving battery safety and service life.

[0067] Please refer to Figure 13 , Figure 13 This is a flowchart of the assembly method for the top cover provided in this application embodiment. Based on the same concept, this application embodiment provides a top cover assembly method. The top cover includes a top cover body and a pole post. The specific structure of the top cover can be the same as the top cover 100 described above.

[0068] The method includes: Step S110: Orient the riveted part of the pole towards the top cover body.

[0069] In step S110 above, the robotic arm can be controlled to operate the pole post and the top cover to ensure correct orientation for subsequent insertion operations.

[0070] Step S120: Insert the pole into the through hole of the top cover body.

[0071] In step S120 above, the robotic arm can also be controlled to operate the pole and the top cover, passing the pole through each layer of the top cover body in sequence, such as: upper plastic part, substrate, lower plastic part, sealing ring, pole base, etc., until the terminal contacts the corresponding surface of the top cover body.

[0072] Step S130: With the terminal of the pole in contact with one side of the top cover, control the riveting machine to apply riveting force to the riveting part of the pole until the riveting part fits against the edge of the through hole on the other side of the top cover body.

[0073] In step S130 above, axial pressure is applied to the riveting part by a riveting machine, accompanied by rotation or oscillation, so that the end of the column undergoes plastic deformation, radial expansion to form a flange, and it cooperates with the pole base, etc. to form a riveting.

[0074] The above-described implementation process can be the same as that of the top cover described earlier. Furthermore, the top cover assembly method provided in this application embodiment is easily automated. By controlling the riveting process parameters, product consistency and reliability can be guaranteed, thereby effectively improving production efficiency and product quality.

[0075] Please refer to Figure 14 , Figure 14 This is a perspective view of the battery cell 10 provided in this application embodiment. Based on the same concept, this application embodiment provides a battery cell 10, including a cell 200 and a top cover 100 as described above. The top cover 100 is mounted on the end of the cell 200. The tabs of the cell 200 are electrically connected to the terminals 110 of the top cover 100. As a preferred embodiment, in the top cover 100 mounted near the positive terminal of the cell 200, the material of the post 111 is the same as the material of the terminal 112, and the post 111 and the terminal 112 are integrally formed. In the top cover 100 mounted near the negative terminal of the cell 200, the material of the post 111 is different from the material of the terminal 112, and the post 111 and the terminal 112 are pressed together.

[0076] The length of cell 200 is L=350mm~650mm, the height is H=85mm~135mm, and the thickness is T=12mm~28mm. Optionally, an insulating protective bracket can be provided at the positive terminal to prevent the tab from contacting the housing.

[0077] The above implementation process is the same as that of the top cover 100 described above, and will not be repeated here.

[0078] Based on the same concept, embodiments of this application provide a battery pack including at least two battery cells 10 as described above.

[0079] The above implementation process is the same as that of the battery cell 10 described above, and will not be repeated here.

[0080] In summary, the top cover 100, the assembly method of the top cover 100, the battery cell 10, and the battery pack provided in the various embodiments of this application are riveted to the top cover 100 body via a riveting portion 113 on the end of the terminal 110 away from the terminal 112. This eliminates the riveting block originally required for assembling the terminal 110 and the top cover 100 body, increasing the welding area between the terminal 110 and the external conductive parts, thereby enabling the external conductive parts of the battery to carry higher current. Compared to friction welding, this reduces costs and also reduces the risk of the copper-aluminum friction-welded terminal 110 breaking under external impact, thus improving the structural reliability of the top cover 100. The design of the recessed portion 114 makes it easier for stress to concentrate in the recessed portion 114 area during folding, resulting in a more regular flange shape after folding. This increases the contact area between the flange and the top cover 100 body, further improving the stability of the riveting. Based on the riveting of the riveting part 113 to the top cover 100 body, welding is then performed on the area where the outer edge of the riveting part 113 contacts the top cover 100 body. This further improves the connection strength between the pole post 110 and the top cover 100 body, and also improves the sealing performance. This effectively prevents problems such as loosening of the connection or leakage of electrolyte caused by vibration, impact, etc., thereby improving the safety and service life of the battery cell 10.

[0081] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A top cover, characterized in that, Including the pole and the top cover body; The pole includes a column, a terminal, and a riveting part; a first end of the column is connected to the riveting part, and a second end of the column is connected to the terminal; The top cover body is provided with a through hole; the column penetrates the through hole of the top cover body; The terminal is located on one side of the top cover body, and the riveting part is located on the other side of the top cover body and fits the edge of the through hole; The terminal is used to connect to an external conductive component; the first end of the column is used to connect to the electrode tab of the battery cell.

2. The top cover according to claim 1, characterized in that, The riveting portion includes a flange extending radially outward along the column.

3. The top cover according to claim 2, characterized in that, A recess is provided at the connection between the flange and the column; The recessed portion is recessed along the recessed direction; wherein, the recessed direction includes the direction from the first end of the column toward the second end of the column.

4. The top cover according to claim 1, characterized in that, The outer edge of the riveted part is welded to the other side of the top cover body.

5. The top cover according to claim 1, characterized in that, in, On the same projection plane perpendicular to the axis of the column, the projection of the column lies within the projection of the terminal.

6. The top cover according to claim 1, characterized in that, in, The material of the column is different from that of the terminal; the column and the terminal are pressed together.

7. The top cover according to claim 1, characterized in that, in, The material of the column is the same as that of the terminal; the column and the terminal are integrally formed.

8. The top cover according to claim 1, characterized in that, The top cover body includes an upper plastic part, a substrate, a lower plastic part, and an electrode base; The upper plastic component is located on the side of the substrate facing the terminal and is connected to the substrate; the lower plastic component is located on the side of the substrate facing the riveting part and is connected to the substrate. The pole base is located on the side of the lower plastic part facing away from the substrate and is connected to the lower plastic part; The column penetrates the upper plastic part, the substrate, the lower plastic part, and the pole base; The terminal is located on the side of the upper plastic part facing away from the substrate, and the riveting part is located on the side of the pole base facing away from the base, and fits the edge of the through hole provided on the pole base.

9. The top cover according to claim 8, characterized in that, The top cover body also includes a sealing ring; The sealing ring is fitted onto the column and passes through the substrate and the lower plastic part; The sealing ring is located between the upper plastic part and the pole base.

10. A method for assembling a top cover, characterized in that, in, The top cover includes a top cover body and an pole post; The method includes: Orient the riveted portion of the pole post toward the top cover body; The column of the pole passes through the through hole of the top cover body; With the terminal of the pole in contact with one side of the top cover, the riveting machine is controlled to apply riveting force to the riveting part of the pole until the riveting part is attached to the edge of the through hole on the other side of the top cover body.

11. A single battery cell, characterized in that, Includes the battery cell and the top cover according to any one of claims 1 to 9; The top cover is installed at the end of the battery cell; The tabs of the battery cell are electrically connected to the terminals of the top cover.

12. A battery pack, characterized in that, It includes at least two battery cells as described in claim 11.

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