Cover plate, top cover assembly, battery monomer, battery and electric device

Abstract

The utility model relates to a cover plate, a top cover assembly, a single battery and an electric device. The single battery comprises a shell, a battery core assembly and the top cover assembly, the at least two second connecting parts of the pole column are arranged at intervals along the first preset direction, namely the thickness direction of the shell, so that the tabs extending from the at least two battery cells in the 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 at least two second connecting parts can be respectively positioned in the two first grooves; the second insulating part covers the second connecting part, and the flanging sub-part formed by bending the flanging part limits the second insulating part along the thickness direction of the cover plate, so that the first connecting part can be well prevented from being separated from the first groove. Therefore, the second connecting part can be reliably limited in the first groove, so that the pole and the cover plate are firmly connected.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a cover plate, 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 the battery cell, 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 large, the assembly between them and the cover plate becomes more difficult, resulting in a less secure connection and affecting the reliability of the top cover assembly. Utility Model Content

[0003] Therefore, it is necessary to provide a cover plate, 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 cover plate, including a first side and a second side disposed opposite to each other along the thickness direction. The cover plate has an installation area for mounting poles. On the first side of the cover plate, the installation area is provided with at least two first grooves. The at least two first grooves are spaced apart along a first preset direction. Each first groove is provided with a first through hole. The edge of each first groove is formed with a flange. The flange extends around at least part of the edge of the first groove.

[0005] In one embodiment, the mounting area is further provided with a second groove, and a second groove is provided between two adjacent first grooves, with each second groove communicating with the two adjacent first grooves.

[0006] In one embodiment, the depth of the second groove is 0.1 to 0.5 times the thickness of the cover plate.

[0007] In one embodiment, the sidewall of the second groove is formed with a first protrusion and / or a first recess.

[0008] In one embodiment, the first protrusion extends from the bottom wall of the second groove to the opening of the second groove; and / or

[0009] The first recess extends from the bottom wall of the second groove to the opening of the second groove.

[0010] In one embodiment, a third groove is formed on the bottom wall of the second groove.

[0011] In one embodiment, the depth of the third groove is 0.05 to 0.5 times the thickness of the cover plate.

[0012] In one embodiment, the third groove narrows from the bottom wall to the opening in the depth direction of the third groove.

[0013] In one embodiment, the third groove is located in the middle of the second groove and is arranged symmetrically about the centerline of the cover plate along its length.

[0014] In one embodiment, the depth of the first groove is greater than the depth of the second groove.

[0015] In one embodiment, along the length of the cover plate, the edge of the second groove is located on the side of the edge of the first groove facing inwards from the first groove; or, the edge of the second groove extends beyond the edge of the first groove to the side facing away from the inside of the first groove, and the extension distance is less than or equal to 2 mm.

[0016] In one embodiment, the distance between the edge of the first through hole and the flange is 1 mm to 5 mm.

[0017] In one embodiment, the edge of the first groove includes a first edge and a second edge, the length of the first edge is more than half the edge length of the first groove, and it is located on the side of the first groove away from the other first groove along the first preset direction, the flange extends along the first edge, and the two ends of the extension direction of the flange do not extend beyond the first edge.

[0018] In one embodiment, the mounting area is further provided with a second groove, and a second groove is provided between two adjacent first grooves, and each second groove is interconnected with two adjacent first grooves; the distance between the two ends of the flange in the extension direction and the second groove is greater than 1.4 mm.

[0019] In one embodiment, two mutually spaced installation areas are provided along a second preset direction, which is perpendicular to the first preset direction and the thickness direction of the cover plate, respectively.

[0020] A top cover assembly, comprising:

[0021] The cover plate as described in any of the above embodiments;

[0022] The pole post includes a first connecting portion, at least two second connecting portions, and a transition portion connecting each second connecting portion to the first connecting portion. Each second connecting portion is respectively installed in the first groove and extends from the first through hole to a second side of the cover plate.

[0023] The first insulating element includes a first insulating portion and a second insulating portion, the first insulating portion being located between the cover plate and the first connecting portion, the second insulating portion covering at least a portion of the second connecting portion, and the flanged portion formed by bending the flanged portion extending to the side of the second insulating portion away from the cover plate.

[0024] In one embodiment, a fourth groove is formed on the surface of the first connecting portion facing the cover plate, and the first insulating portion partially fills the fourth groove.

[0025] In one embodiment, the second connecting portion further includes a protrusion that extends from the first through hole toward and beyond the second side of the cover plate. The second connecting portion also includes a flange that is located on the first side of the cover plate and extends circumferentially around the protrusion. The projection of the flange in the thickness direction of the cover plate does not at least partially coincide with the projection of the first through hole in the thickness direction of the cover plate.

[0026] In one embodiment, the top cover assembly further includes a sealing ring, the sealing ring including a first sealing portion fitted onto the protrusion and a second sealing portion pressed between the flange and the cover plate.

[0027] In one embodiment, the mounting area is further provided with a second groove, and a second groove is provided between two adjacent first grooves, and each second groove is interconnected with two adjacent first grooves; the orthographic projection of the first connecting portion on the cover plate is located in the second groove, and the first insulating portion partially fills the second groove.

[0028] A battery cell includes 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. The at least two sets of cells extend at least two sets of tabs, and each set of tabs is connected to a corresponding second connection portion.

[0029] Compared with the prior art, this application has at least the following advantages:

[0030] In the aforementioned cover plate, top cover assembly, and battery cells, at least two second connecting portions of the terminal post are spaced apart along a first preset direction, 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 the corresponding second connecting portion, thus eliminating the need for an adapter plate. At least two second connecting portions can be positioned within two first grooves respectively; the second insulating portion covers the second connecting portion, and the flanged portion formed by bending the flanged portion limits the second insulating portion along the thickness direction of the cover plate, effectively preventing the first connecting portion from detaching from the first groove. Therefore, the second connecting portion can be reliably confined within the first groove, ensuring a firm connection between the terminal post and the cover plate.

[0031] On the other hand, this application also provides a battery and an electrical device.

[0032] 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.

[0033] 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

[0034] 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.

[0035] Figure 1 This is an exploded view of a single battery cell in one embodiment of the present invention;

[0036] Figure 2 for Figure 1 A cross-sectional view of the battery cell shown;

[0037] Figure 3 for Figure 1 A top view of the top cover assembly in the shown battery cell;

[0038] Figure 4 for Figure 3 The top cover assembly shown is a cross-sectional view along AA;

[0039] Figure 5 for Figure 3 Exploded view of the top cover assembly shown;

[0040] Figure 6 for Figure 3A schematic diagram of the structure of the cover plate in the top cover assembly is shown;

[0041] Figure 7 for Figure 6 Top view of the cover plate shown;

[0042] Figure 8 for Figure 7 The cover plate shown is a cross-sectional view along BB;

[0043] Figure 9 for Figure 3 A schematic diagram of the pole structure in the top cover assembly is shown;

[0044] Figure 10 for Figure 9 The cross-sectional view of the pole shown. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] In addition, please see Figure 1 and Figure 2 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.

[0056] 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 200 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.

[0057] The cell assembly 300 is the core component of the battery cell 10. To adapt to the shape of the casing 200, the cell assembly 300 in this embodiment is generally rectangular. The cell assembly 300 typically includes at least two groups of cells 310 arranged side-by-side along the thickness direction of the casing 200. Each group of cells 310 extends a tab 311 from its end face near the top cover assembly 100. Each group of cells can consist of one cell or multiple cells; this is not limited here. When each group of cells includes one cell, that cell extends a tab 311 towards the end face of the top cover assembly 100. When each group of cells includes multiple cells, each cell extends a tab 311 towards the end face of the top cover assembly 100, and the tabs 311 on the cells in the same group are brought together to form a set of tabs 311. The battery cell 310 can be formed by winding or stacking positive electrode plates, negative electrode plates, and a separator that serves as an insulator between the negative electrode plates and the positive electrode plates. The battery cell 310 formed by winding can be pressed into a flat shape. The tabs 311 of each battery cell 310 are divided into positive tabs (not shown in the figure) and negative tabs (not shown in the figure), which are led out from the positive electrode plate and the negative electrode plate, respectively.

[0058] In this embodiment, the positive and negative tabs can be located at the same end of the battery cell 310, or the positive tab can be located at one end of the battery cell 310 and the negative tab at the opposite end of the battery cell 310. Specifically, in this embodiment, the battery cell assembly 300 includes two sets of battery cells 310. The positive and negative tabs of each set of battery cells 310 are located at the same end of the battery cell 310 and are spaced apart along the length direction of the battery cell assembly 300, that is, the length direction of the housing 200. Therefore, the battery cell assembly 300 has a total of four sets of tabs 331 near the end face of the top cover assembly 100, of which two sets are negative tabs spaced apart along the width direction of the housing 200, and the other two sets are positive tabs spaced apart along the width direction of the housing 200, while the two sets of negative tabs and the two sets of positive tabs are spaced apart along the length direction of the housing 200.

[0059] The length direction of the housing 200 refers to Figure 2The direction perpendicular to the drawing plane (i.e., the second preset direction) is shown, while the width direction of the shell 200 (i.e., the first preset direction), which is also the thickness direction of the shell 200, refers to... Figure 2 The left and right directions are shown. Due to obstruction, therefore... Figure 2 Only two sets of electrodes are shown, and both sets of electrodes are positive electrodes.

[0060] Before the battery cell assembly 300 is installed into the housing 200, it needs to be assembled with the top cover assembly 100. Specifically, the tabs 311 of the battery cell assembly 300 need to be electrically connected to the terminals 110 on the top cover assembly 100 (see...). Figure 3 Then, the cell assembly 300 is installed into the housing 200, so that the operation is not limited by the small space inside the housing 200. The terminal post 110 is electrically connected to the tab 311 to serve as the terminal of the battery cell 10.

[0061] Please refer to the following: Figure 3 , Figure 4 and Figure 5 In one embodiment of the present invention, the top cover assembly 100 includes a pole post 110, a cover plate 120, and a first insulating member 130.

[0062] 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 a first side and a second side arranged opposite each other along its thickness direction. The second side is the inner side, referring 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 first side is the outer side, referring 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.

[0063] The cover plate 120 has a mounting area for mounting the terminals 110. Since the positive and negative terminals of the battery cell assembly 300 in this embodiment are located at the same end, the cover plate 120 has two spaced-apart mounting areas along the second preset direction, i.e., the length direction of the cover plate 120, to respectively mount two terminals 110. The two terminals 110 are respectively used for welding to the positive and negative terminals of the battery cell assembly 300. Of course, if the positive and negative terminals are located at opposite ends of the battery cell assembly 300, then only one mounting area and one terminal 110 are needed on the cover plate 120.

[0064] Please refer to the following: Figure 6 , Figure 7 and Figure 8On the first side of the cover plate 120, at least two first grooves 122 are provided in the mounting area, and the at least two first grooves 122 are spaced apart along a first preset direction. The first preset direction is the width direction of the cover plate 120, which is also the thickness direction of the housing 200, and is perpendicular to a second preset direction. Each first groove 122 is provided with a first through hole 121, and each first groove 122 has a flange 123 formed on its edge, which extends around at least part of the edge of the first groove 122.

[0065] The first groove 122 can be formed by stamping. During the stamping process, the material in the area where the first groove 122 is located is squeezed towards the edge, thereby forming a flange 123 at the same time as forming the first groove 122. Before being assembled with the pole post 110, the flange 123 is approximately perpendicular to the surface of the cover plate 120 (see...). Figure 7 During the assembly of the pole post 110, the flange 123 needs to be bent to form the flange sub-part 1231 (see...). Figure 4 The first through hole 121 is located within the range of the first groove 122 and extends through the cover plate 120 along the thickness direction to better limit the pole post 110.

[0066] Please refer to the following: Figure 9 and Figure 10 The terminal post 110 includes a first connecting portion 111, a second connecting portion 112, and a transition portion 113. At least two second connecting portions 112 are provided, and each second connecting portion 112 is connected to the first connecting portion 111 via the transition portion 113. 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 means of welding or other methods. Specifically, the electrical connector can be a busbar or a terminal post 110 of another battery cell 10.

[0067] A first connecting portion 111 is installed on the first side of the mounting area of ​​the cover plate 120, and at least two second connecting portions 112 are also spaced apart along a first preset direction, i.e., the width direction of the cover plate 120. Each second connecting portion 112 is installed in the first groove 122 and extends from the first through hole 121 toward the second side of the cover plate 120. The portion of the second connecting portion 112 extending toward the second side of the cover plate 120 is used for welding to the tab 311.

[0068] Specifically, in this embodiment, the second connecting portion 112 further includes a protrusion 1121, which extends from the first through hole 121 toward the second side of the cover plate 120 and extends beyond the second side of the cover plate 120. The tab 311 is welded to the portion of the protrusion 1121 that extends beyond the second side of the cover plate 120, so the welding area is not blocked by the sidewall of the first through hole 121, thus providing more space for the welding operation of the tab 311 and making the operation more convenient.

[0069] Furthermore, the second connecting portion 112 also includes a flange portion 1122, which is located on the first side of the cover plate 120 and extends circumferentially around the protrusion 121. The projection of the flange portion 1122 in the thickness direction of the cover plate 120 does not at least partially coincide with the projection of the first through hole 121 in the thickness direction of the cover plate 120. Therefore, the flange portion 1122 can abut against the edge of the first through hole 121, thereby positioning the second connecting portion 112 along the thickness direction of the cover plate 120.

[0070] In addition, please refer to again Figure 4 In this embodiment, the top cover assembly 100 further includes a sealing ring 140, which includes a first sealing portion 141 sleeved on the protrusion 1121 and a second sealing portion 142 pressed between the flange portion 1122 and the cover plate 120. 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 and improving the sealing performance of the top cover assembly 100.

[0071] The tabs 311 of the battery cell 310 can be welded to the corresponding second connecting parts 112 using methods such as laser welding, ultrasonic welding, or pressure welding, or they can be bonded to the corresponding second connecting parts 112 using conductive adhesive. Since the arrangement direction of at least two second connecting parts 112 is consistent with the arrangement direction of at least two sets of battery cells 310 in the battery cell assembly 300, the tabs 311 of at least two sets of battery cells 310 can correspond to the positions of at least two second connecting parts 112 respectively. 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, thereby omitting the adapter piece.

[0072] The first insulating member 130 is capable of forming insulation between the pole post 110 and the cover plate 120. The first insulating member 130 includes a first insulating portion 131 and a second insulating portion 132. The first insulating portion 131 is located between the cover plate 120 and the first connecting portion 111, the second insulating portion 132 covers at least a portion of the second connecting portion 112, and the flange sub-portion 1231 formed by bending the flange portion 123 extends to the side of the second insulating portion 132 away from the cover plate 120.

[0073] Since the second insulating portion 132 covers the second connecting portion 112, the second insulating portion 132 not only provides insulation but also prevents the second connecting portion 112 from detaching from the first groove 122 along the thickness direction of the cover plate 120. Furthermore, the flange portion 1231 limits the second insulating portion 132 along the thickness direction of the cover plate 120, preventing the second insulating portion 132 from loosening and thus improving its stability. Therefore, the second connecting portion 112 can be reliably contained within the first groove 122 under the combined action of the second insulating portion 132 and the flange portion 1231, ensuring a secure connection between the pole post 110 and the cover plate 120.

[0074] The first insulating component 130 can be injection molded with the terminal post 110 first, and then assembled as a whole with the cover plate 120. In this case, the flange portion 1231 is not covered by the first insulating component 130, and its function is to press the first insulating component 130 and the terminal post 110 together onto the cover plate 120. Alternatively, the terminal post 110 can be assembled onto the cover plate 120 first, and then the first insulating component 130 can be integrally injection molded. In this case, a bonding force will be generated between the first insulating component 130, the cover plate 120, and the terminal post 110, thereby fixing the terminal post 110 to the cover plate 120, and the flange portion 1231 will also be covered by the first insulating component 130.

[0075] To enhance the connection between the pole post 110 and the top cover 120, in this embodiment, after the pole post 110 is assembled onto the cover plate 120, the first insulating component 130 is obtained through integral injection molding. It can be seen that the first insulating component 130 covers the flange portion 1231 and provides the tensile force to fix the pole post 110 to the cover plate 120.

[0076] Please refer to it again. Figure 7 and Figure 8 In this embodiment, the installation area is further provided with a second groove 124, and a second groove 124 is provided between two adjacent first grooves 122. Each second groove 124 is interconnected with the two adjacent first grooves 122. Correspondingly, the orthographic projection of the first connecting part 111 on the cover plate 120 is located in the second groove 124, and the first insulating part 131 partially fills the second groove 124.

[0077] As can be seen, the first connecting part 111 is installed in the first groove 122. The first groove 122 can position and limit the first connecting part 111, thereby further improving the firmness of the connection between the pole post 110 and the cover plate 120. Moreover, the second groove 124 can increase the contact area between the first insulating part 131 and the cover plate 120, thereby increasing the bonding force between the two, which is also beneficial to improving the firmness of the connection between the pole post 110 and the cover plate 120.

[0078] Furthermore, in this embodiment, the depth of the second groove 124 is 0.1 to 0.5 times the thickness of the cover plate 120. For example, it can be 0.1 times, 0.2 times, 0.3 times, 0.4 times, or 0.5 times, including but not limited to the listed values. Other values ​​within the above range are still applicable and are not specifically limited here. When the depth of the second groove 124 is less than 0.1 times the thickness of the cover plate 120, the depth of the second groove 124 is too small and cannot effectively accommodate the first insulating part 131 and the first connecting part 111. When the depth of the second groove 124 is greater than 0.5 times the thickness of the cover plate 120, it will significantly weaken the structural strength of the cover plate 120 and affect the reliability of the top cover assembly 100.

[0079] Optionally, the depth of the second groove 124 is 0.15 to 0.25 times the thickness of the cover plate 120. For example, it can be 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, or 0.25 times the thickness, including but not limited to the listed values. Other values ​​within the above range are still applicable and are not specifically limited here. More specifically, the depth of the first groove 122 is greater than the depth of the second groove 124, thereby facilitating the extension of the second connecting portion 112 toward the second side of the cover plate 120.

[0080] Furthermore, in this embodiment, the sidewall of the second groove 124 is formed with at least one of a first protrusion (not shown) and a first recess 1241. Specifically, the first protrusion extends from the bottom wall of the second groove 124 to the opening of the second groove 124, and the first recess 1241 also extends from the bottom wall of the second groove 124 to the opening of the second groove 124. The first protrusion and the first recess 1241 are generally formed simultaneously during the forming process of the second groove 124 by making the sidewall of the second groove 124 convex and concave. The provision of the first protrusion and the first recess 1241 can increase the contact area between the first insulating part 131 and the second groove 124, thereby enhancing the bonding force between the first insulating member 130 and the cover plate 120.

[0081] Specifically, in this embodiment, a third groove 125 is formed on the bottom wall of the second groove 124. The portion of the first insulating part 131 that fills the second groove 124 also partially fills the third groove 125, thereby further increasing the contact area between the first insulating part 131 and the cover plate 120, so as to enhance the bonding force between the first insulating part 130 and the cover plate 120.

[0082] Furthermore, in this embodiment, the depth of the third groove 125 is 0.05 to 0.5 times the thickness of the cover plate 120. For example, it can be 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, or 0.50 times the thickness of the cover plate 120, including but not limited to the listed values. Other values ​​within the above range are still applicable and are not specifically limited here. When the depth of the third groove 125 is less than 0.05 times the thickness of the cover plate 120, its depth is too small, and the first insulating portion 131 cannot be effectively filled. When the depth of the third groove 125 is greater than 0.5 times the thickness of the cover plate 120, it will significantly weaken the structural strength of the cover plate 120, affecting the reliability of the top cover assembly 100. Optionally, the depth of the third groove 125 is 0.1 to 0.2 times the thickness of the cover plate 120.

[0083] The third groove 125 can be provided singly or in multiple ways. Optionally, the third groove 125 is located in the middle of the second groove 124 and is arranged symmetrically about the centerline of the length direction of the cover plate 120. In this way, the bonding force generated between the third groove 125 and the first insulating part 131 is located in the middle of the cover plate 120, thereby ensuring a more balanced interaction force between the first insulating part 130 and the cover plate 120.

[0084] Furthermore, in this embodiment, in the depth direction of the third groove 125, the third groove 125 narrows from the bottom wall to the opening.

[0085] The third groove 125 can be gradually narrowed or narrowed in a stepped manner. The third groove 125 has a structure that is thicker at the bottom and thinner at the top. Therefore, the part of the first insulating part 131 that fills the third groove 125 also has a structure that is thicker at the bottom and thinner at the top. This can provide a greater pulling force between the first insulating member 300 and the pole post 110, and prevent the first insulating part 131 that is filled in the third groove 125 from falling out.

[0086] In addition, please refer to again Figure 10 In this embodiment, a fourth groove 1111 is formed on the surface of the first connecting portion 111 facing the cover plate 120, and the first insulating portion 131 partially fills the fourth groove 1111. The fourth groove 1111 can increase the contact area between the first insulating portion 131 and the first connecting portion 111, thereby enhancing the bonding force between the first insulating portion 131 and the pole post 110, which helps to further improve the firmness of the connection between the pole post 110 and the cover plate 120.

[0087] Please refer to it again. Figure 7In this embodiment, in the second preset direction, the edge of the second groove 124 is located on the side of the edge of the first groove 122 facing the inside of the first groove 122. That is, the second groove 124 is shorter than the first groove 122, and the edges at both ends of the second groove 124 do not exceed the edge of the first groove 122.

[0088] Alternatively, the edge of the second groove 124 extends beyond the edge of the first groove 122 to the side facing away from the interior of the first groove 122, and the distance of the extension is less than or equal to 2 mm. That is, the second groove 124 is longer than the first groove 122, but the distance by which the edges at both ends extend beyond the edge of the first groove 122 does not exceed 2 mm. This avoids the first insulating part 130 from being too thick during injection molding, facilitating injection molding of the first insulating part 130 and saving material.

[0089] In this embodiment, the distance between the edge of the first through hole 121 and the flange 123 is 1mm to 5mm. A step is formed in the area between the edge of the first through hole 121 and the flange 123 for mounting the sealing ring 140. When the distance between the edge of the first through hole 121 and the flange 123 is less than 1mm, the step width will be too small, and the sealing ring 140 will not have sufficient deformation space; while when the step width is greater than 5mm, the thickness of the first insulating member 130 at that location will be too large.

[0090] In this embodiment, the edge of the first groove 122 includes a first edge and a second edge. The length of the first edge is more than half of the edge length of the first groove 122 and is located on the side of the first groove 122 away from the other first groove 122 along a first preset direction. The flange 123 extends along the first edge, and the two ends of the extension direction of the flange 123 do not exceed the first edge.

[0091] As can be seen, the flange 123 is not completely arranged around the circumference of the first groove 122. There is a notch on the side facing the second groove 124, that is, on the side where the second edge is located, so that the transition part 113 can be installed, thus avoiding limiting the transition part 113. Moreover, the flange 123 extends along more than half of the periphery of the first groove 122, that is, along more than half of the periphery of the second connecting part 112. Therefore, the flange sub-part 1231 formed by bending can better limit the second connecting part 112.

[0092] Furthermore, in this embodiment, the distance between the two ends of the flange 123 extending in the direction of extension and the second groove 124 is greater than 1.4 mm. In this way, sufficient space can be reserved between the flange 123 and the second groove 124 to avoid interference between the flange 123 and the first connecting portion 111 installed in the second groove 124 during the process of bending the flange 123 to form the flange sub-part 1231.

[0093] The cover plate 120, top cover assembly 100, and battery cell 10, and the at least two second connecting portions 112 of the terminal post 110 are arranged at intervals along a first preset direction, 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 tabs 311 of each cell 310 can be directly welded to the corresponding second connecting portion 112, thus omitting the adapter piece. The at least two second connecting portions 112 can be positioned in the two first grooves 122 respectively; the second insulating portion 132 covers the second connecting portion 112, and the flange sub-part 1231 formed by bending the flange portion 123 limits the second insulating portion 132 along the thickness direction of the cover plate 120, which can effectively prevent the first connecting portion 111 from detaching from the first groove 122. Therefore, the second connecting portion 112 can be reliably confined within the first groove 122 to ensure a secure connection between the pole post 110 and the cover plate 120.

[0094] 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.

[0095] 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 cover plate comprising a first side and a second side disposed opposite each other along its thickness direction, the cover plate having a mounting area for mounting an electrode post, characterized in that, On the first side of the cover plate, the mounting area is provided with at least two first grooves, the at least two first grooves are spaced apart along a first preset direction, each first groove is provided with a first through hole, and each first groove has a flanged portion formed on its edge, the flanged portion extending around at least part of the edge of the first groove.

2. The cover plate according to claim 1, characterized in that, The installation area is also provided with a second groove, and a second groove is provided between two adjacent first grooves, and each second groove is interconnected with two adjacent first grooves.

3. The cover plate according to claim 2, characterized in that, The depth of the second groove is 0.1 to 0.5 times the thickness of the cover plate.

4. The cover plate according to claim 2, characterized in that, The sidewall of the second groove is formed with a first protrusion and / or a first recess.

5. The cover plate according to claim 4, characterized in that, The first protrusion extends from the bottom wall of the second groove to the opening of the second groove; and / or The first recess extends from the bottom wall of the second groove to the opening of the second groove.

6. The cover plate according to claim 2, characterized in that, The bottom wall of the second groove has a third groove.

7. The cover plate according to claim 6, characterized in that, The depth of the third groove is 0.05 to 0.5 times the thickness of the cover plate.

8. The cover plate according to claim 6, characterized in that, In the depth direction of the third groove, the third groove narrows from the bottom wall to the opening.

9. The cover plate according to claim 6, characterized in that, The third groove is located in the middle of the second groove and is arranged symmetrically about the center line of the length direction of the cover plate.

10. The cover plate according to claim 2, characterized in that, The depth of the first groove is greater than the depth of the second groove.

11. The cover plate according to claim 2, characterized in that, Along the length of the cover plate, the edge of the second groove is located on the side of the edge of the first groove facing the inside of the first groove; or, the edge of the second groove extends beyond the edge of the first groove and faces away from the inside of the first groove, and the distance of the extension is less than or equal to 2 mm.

12. The cover plate according to claim 1, characterized in that, The distance between the edge of the first through hole and the flange is 1 mm to 5 mm.

13. The cover plate according to claim 1, characterized in that, The edge of the first groove includes a first edge and a second edge. The length of the first edge is more than half of the edge length of the first groove and is located on the side of the first groove away from the other first groove along the first preset direction. The flange extends along the first edge and the two ends of the extension direction of the flange do not exceed the first edge.

14. The cover plate according to claim 13, characterized in that, The installation area is also provided with a second groove, and a second groove is provided between two adjacent first grooves. Each second groove is interconnected with two adjacent first grooves. The distance between the two ends of the flange and the second groove in the extension direction is greater than 1.4 mm.

15. The cover plate according to any one of claims 1 to 14, characterized in that, Two mutually spaced installation areas are provided along a second preset direction, which is perpendicular to the first preset direction and the thickness direction of the cover plate, respectively.

16. A top cover assembly, characterized in that, include: The cover plate as described in any one of claims 1 to 15 above; The pole post includes a first connecting portion, at least two second connecting portions, and a transition portion connecting each second connecting portion to the first connecting portion. Each second connecting portion is respectively installed in the first groove and extends from the first through hole to a second side of the cover plate. The first insulating element includes a first insulating portion and a second insulating portion, the first insulating portion being located between the cover plate and the first connecting portion, the second insulating portion covering at least a portion of the second connecting portion, and the flanged portion formed by bending the flanged portion extending to the side of the second insulating portion away from the cover plate.

17. The top cover assembly according to claim 16, characterized in that, A fourth groove is formed on the surface of the first connecting portion facing the cover plate, and the first insulating portion partially fills the fourth groove.

18. The top cover assembly according to claim 16, characterized in that, The second connecting portion further includes a protrusion that extends from the first through hole toward the second side of the cover plate and beyond the second side of the cover plate. The second connecting portion also includes a flange that is located on the first side of the cover plate and extends circumferentially around the protrusion. The projection of the flange in the thickness direction of the cover plate does not at least partially coincide with the projection of the first through hole in the thickness direction of the cover plate.

19. The top cover assembly according to claim 18, characterized in that, The top cover assembly also includes a sealing ring, which includes a first sealing portion sleeved on the protrusion and a second sealing portion pressed between the flange and the cover plate.

20. The top cover assembly according to claim 16, characterized in that, The installation area is also provided with a second groove, and a second groove is provided between two adjacent first grooves. Each second groove is interconnected with two adjacent first grooves. The orthographic projection of the first connecting part on the cover plate is located in the second groove, and the first insulating part partially fills the second groove.

21. 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 16 to 20, wherein 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, the at least two sets of battery cells extending at least two sets of tabs, and each set of tabs is connected to a corresponding second connection portion.

22. A battery, characterized in that, It includes a plurality of battery cells as described in claim 21 above, the plurality of battery cells being electrically connected by an electrical connector, and the electrical connector being connected to the first connection portion.

23. An electrical appliance, characterized in that, Includes the battery cell as described in claim 21 or the battery as described in claim 22.

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