Top cover assembly, battery cell and battery pack

Abstract

The utility model relates to battery technical field provides a top cover subassembly, electric core and battery package, above -mentioned top cover subassembly includes: top cover body, pole, boss and connecting piece, top cover body forms with the first through -hole of going through top cover body, pole is worn in the first through -hole, and is electrically connected with the pole lug of electric core through connecting piece, boss is connected in one side of top cover body and is along the height direction of top cover body and is outwardly convex, and the boss is suitable for with the box body support connection of battery package, along the length direction of top cover body, the boss is spaced apart with the first through -hole, the boss includes support platform and insulating platform, and the inner wall of support platform is equipped with insulating platform, makes the inner chamber of the position of insulating platform away from support platform, and the inner chamber is used for accommodating pole lug and connecting piece, one of support platform and insulating platform is equipped with connecting groove, and the other is equipped with connecting rib, and the connecting rib is inserted in connecting groove, the utility model has improved the safety performance of electric core, has realized the close connection of support platform and insulating platform.

Description

Technical Field

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

[0002] The battery pack includes a housing and battery modules assembled inside the housing. Each battery module consists of multiple cells, and the terminals of the cells are electrically connected through a busbar. The housing provides physical support and protection for the battery modules. Each cell includes a housing, a top cover assembly, and an electrode assembly. The electrode assembly is located within a cavity formed by the housing and the top cover assembly, and the terminals pass through the top cover assembly and are electrically connected to the tabs of the electrode assembly.

[0003] Currently, in order to provide bending space for the tabs, sufficient height needs to be reserved between the electrode assembly and the top cover body, which wastes the space inside the cell. Furthermore, the cell only contacts other structures in the cell module through the terminal post. When the upper surface of the cell is subjected to force, the terminal post is directly subjected to force, which increases the risk of short circuit and results in low structural strength. Utility Model Content

[0004] This utility model provides a top cover assembly, a battery cell, and a battery pack to solve the problems in the prior art where the top cover assembly only bears the force through the poles, resulting in low strength of the battery cell, and the space reserved between the top cover assembly and the pole group for bending of the tabs, resulting in low battery cell capacity.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, this utility model provides a top cover assembly, comprising: The top cover body has a first through hole penetrating the top cover body; The electrode post passes through the first through hole and is electrically connected to the electrode tab of the battery cell through a connecting piece; A boss is connected to one side of the top cover body and protrudes outward along the height direction of the top cover body. The boss is adapted to support and connect with the battery pack housing. Along the length direction of the top cover body, the boss is spaced apart from the first through hole. The boss includes a support platform and an insulating platform. The insulating platform is disposed on the inner wall of the support platform, forming an inner cavity at a position away from the support platform. The inner cavity is used to accommodate the electrode tab and the connecting piece. One of the support platform and the insulating platform is provided with a connecting groove, and the other is provided with a connecting rib. The connecting rib is inserted into the connecting groove.

[0006] According to the present invention, a top cover assembly is provided, wherein the top wall of the insulating platform facing the support platform is provided with a connecting rib, and the inner wall of the support platform facing the insulating platform is provided with a connecting groove.

[0007] According to the top cover assembly provided by this utility model, along the length direction of the top cover body, the distance L1 between the edge of the connecting groove and the inner wall of the support platform satisfies: 10mm≤L1≤45mm; And / or, along the length of the top cover body, both ends of the connecting groove and both ends of the connecting rib are rounded.

[0008] According to the present invention, in a top cover assembly, along the height direction of the top cover body, the width of the bottom of the connecting groove is greater than the width of the groove opening.

[0009] According to the present invention, half of the difference between the width of the groove and the width of the groove bottom is W, which satisfies: 0.25mm≤W≤1.0mm.

[0010] According to the present invention, a top cover assembly includes a folded edge on the support platform and a supporting edge on the insulating platform. The folded edge is located at one end of the support platform facing the top cover body and is arranged circumferentially around the outer side of the support platform; the supporting edge is located at one end of the insulating platform facing the folded edge and is arranged circumferentially around the outer side of the insulating platform, and supports the side of the folded edge near the pole group.

[0011] According to the present invention, a top cover assembly is provided, wherein the folded edge has a notch on the side facing the support edge, and the support edge has a protrusion on the side facing the folded edge, the protrusion being inserted into the notch.

[0012] According to the present invention, a top cover assembly is provided, wherein multiple notches and protrusions are provided, and each notch and each protrusion is provided in a one-to-one correspondence; The distance between two adjacent notches along the length of the top cover body is L2, which satisfies: 2mm≤L2≤15mm; And / or, along the height direction of the top cover body, the width of the bottom end of the notch is greater than the width of the opening end of the notch.

[0013] Secondly, this utility model provides a battery cell, comprising: an electrode assembly, a housing, and a top cover assembly as described in any of the preceding claims; The housing has an opening, the top cover assembly is disposed in the opening and surrounds the housing to form a receiving cavity, the electrode assembly is disposed in the receiving cavity, and the electrode assembly is electrically connected to the top cover assembly through electrode tabs and connecting pieces.

[0014] Thirdly, this utility model provides a battery pack, including: a busbar, a housing, and the battery cells as described above; The housing forms a receiving cavity, and multiple battery cells are provided, with the multiple battery cells stacked in the receiving cavity; the busbar is connected to the terminals of the multiple battery cells.

[0015] The top cover assembly, battery cell, and battery pack provided by this utility model, by providing a boss along the length of the top cover body on the side of the terminal post, not only enhances the structural strength of the top cover assembly and thus improves the mechanical strength of the battery cell, but also increases the surface area of ​​the top cover body, thereby increasing the heat dissipation area of ​​the top cover body and the bonding area with the heat-conducting layer, improving the heat dissipation efficiency of the battery cell, controlling the operating temperature of the battery cell, and improving the safety performance of the battery cell. Furthermore, by setting a support platform and an insulating platform on the boss, the inner cavity formed by the support platform can accommodate the bent electrode tabs and connecting pieces, which can also improve the production yield of the top cover assembly. A connecting groove is provided on one of the support platform and the insulating platform, and a connecting rib is provided on the other. The connecting rib is inserted into the connecting groove to achieve a tight connection between the support platform and the insulating platform. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is one of the three-dimensional structural schematic diagrams of the top cover assembly provided by this utility model.

[0018] Figure 2 This is a top view of the boss provided by this utility model.

[0019] Figure 3 This utility model provides Figure 2 AA sectional view.

[0020] Figure 4 This utility model provides Figure 2 BB cross-sectional view.

[0021] Figure 5 This is a three-dimensional structural diagram of the insulating component provided by this utility model.

[0022] Figure 6 This is a three-dimensional structural diagram of the support component provided by this utility model.

[0023] Figure 7 This is a three-dimensional structural diagram of the battery cell provided by this utility model (excluding bosses).

[0024] Figure 8This is a three-dimensional structural diagram of the battery cell provided by this utility model.

[0025] Figure 9 This is a cross-sectional view of the battery cell provided by this utility model.

[0026] Figure label: 1. Top cover assembly; 11. Top cover body; 12. Pole post; 13. Boss; 14. Connecting piece; 15. Connecting block; 131. Support platform; 132. Insulating platform; 1311. Connecting groove; 1312. Folded edge; 1321. Connecting rib; 1322. Supporting edge; 13121. Notch; 13221. Protrusion; 2. Electrode group; 21. Electrode ear; 3. Shell; 100. Battery cells. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model 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 the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0030] In this embodiment of the 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 indicates 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 indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] The following is combined Figures 1 to 9 The top cover assembly, battery cell, and battery pack provided in this embodiment will be described in detail through specific implementation methods and application scenarios.

[0033] Firstly, such as Figure 1 , Figure 5 and Figure 6 As shown, this embodiment provides a top cover assembly 1, including: a top cover body 11, a pole post 12, a boss 13, and a connecting piece 14.

[0034] The top cover body 11 has a first through hole that penetrates the top cover body 11.

[0035] The electrode post 12 passes through the first through hole and is electrically connected to the electrode tab 21 of the battery cell 100 through the connecting piece 14.

[0036] The boss 13 is connected to one side of the top cover body 11 and protrudes outward along the height direction of the top cover body 11. The boss 13 is adapted to be connected to the battery pack housing. Along the length direction of the top cover body 11, the boss 13 is spaced apart from the first through hole. The boss 13 includes a support platform 131 and an insulating platform 132. The insulating platform 132 is located on the inner wall of the support platform 131, so that the position of the insulating platform 132 away from the support platform 131 forms an inner cavity, which is used to accommodate the tab 21 and the connecting piece 14. One of the support platform 131 and the insulating platform 132 is provided with a connecting groove 1311, and the other is provided with a connecting rib 1321. The connecting rib 1321 is inserted into the connecting groove 1311.

[0037] It is understandable that the length, width, and height of the top cover body 11 are shown in the figure. Figure 1 In this embodiment, a protrusion 13 is provided on the side of the terminal post 12, giving the space on the side of the terminal post 12 a raised structure. The protrusion 13 is used for supporting connection with the battery pack housing. Since the height of the protrusion 13 is higher than the height of the electrode group 2, when the surface of the cell 100 is subjected to external impact, the protrusion 13 can withstand the impact, ensuring that the terminal post 12 is not subjected to external impact. Furthermore, since the protrusion 13 has a certain structural strength, it can support the top cover body 11, preventing short circuits in the cell 100 and improving the mechanical strength of the entire cell pack.

[0038] Meanwhile, when the cells 100 are stacked to form a cell module, the upper surface of the cell 100 can conduct heat dissipation through contact with the heat-conducting layer via the electrode post 12, and also through contact with the heat-conducting layer via the boss 13. Compared with the prior art, where most of the top cover body 11 can only dissipate heat through thermal radiation, the contact heat conduction effect of the boss 13 in this embodiment is better, which is more conducive to the heat dissipation of the cell 100, more conducive to controlling the operating temperature of the cell 100, and extending the service life of the cell 100.

[0039] Specifically, the boss 13 can be a frustum of a cylinder, a frustum of a cone, or a curved surface; there are no specific limitations on this.

[0040] The top cover assembly 1 in this embodiment also includes a connecting piece 14, which extends along the length of the top cover body 11. One end of the connecting piece 14 is connected to the pole post 12, and the other end of the connecting piece 14 is bent and extends into the inner cavity and is connected to the tab 21. The connecting piece 14 is arranged in a "Z" shape to ensure that the two ends connected to the pole post 12 and the tab 21 are parallel.

[0041] In this embodiment, the boss 13 is set as a hollow platform with the inner cavity facing the side of the tab 21. The tab 21 and the connecting piece 14 can be accommodated in the inner cavity after bending, thereby reducing the gap height between the pole group 2 and the top cover body 11, increasing the bending space of the tab 21, and thus increasing the capacity of the cell 100.

[0042] Furthermore, in this embodiment, the boss 13 includes a support platform 131 and an insulating platform 132. Both the support platform 131 and the insulating platform 132 are platform-shaped, forming an inner cavity by covering the top cover body 11 to accommodate the bent electrode tab 21 and the connecting piece 14. The side of the support platform 131 facing away from the electrode tab 21 is used for supporting connection with the battery pack housing. The insulating platform 132 is used to isolate the support platform 131 from the electrode tab 21 and the connecting piece 14 in the inner cavity, preventing short circuits between the electrode tab 21 and the connecting piece 14. In this embodiment, by separately setting the boss 13 and the top cover body 11, and integrating the support platform 131 and the insulating platform 132 into one piece, and directly welding the boss 13 to the top cover body 11, the assembly of the boss 13 and the top cover body 11 can be achieved. In this embodiment, the inner walls of the support platform 131 and the insulating platform 132 together form the inner cavity. Since an insulating platform 132 is integrally provided on the inner wall of the support platform 131, there is no need to consider the insulation treatment between the boss 13 and the tab 21 when installing the boss 13 and the top cover body 11, which simplifies the installation steps of the top cover assembly 1 and improves the installation efficiency of the top cover assembly 1.

[0043] Specifically, the support platform 131 and the insulating platform 132 can be heat-fused together into a single structure, or they can be bonded together with an adhesive layer. The support platform 131 can be a metal part, such as an aluminum alloy part. The insulating platform 132 can be a plastic part.

[0044] Furthermore, to improve the connection strength between the support platform 131 and the insulating platform 132, this embodiment provides an insertion structure of a connecting groove 1311 and a connecting rib 1321 between the support platform 131 and the insulating platform 132. Through the insertion and engagement of the connecting groove 1311 and the connecting rib 1321, the stability and reliability of the connection between the support platform 131 and the insulating platform 132 are achieved.

[0045] Specifically, a connecting groove 1311 can be provided on the support platform 131 and a connecting rib 1321 can be provided on the insulating platform 132, or a connecting rib 1321 can be provided on the support platform 131 and a connecting groove 1311 can be provided on the insulating platform 132. The connecting groove 1311 and the connecting rib 1321 can be a single continuous section or multiple sections, with the multiple connecting grooves 1311 and connecting ribs 1321 arranged at intervals. The connecting groove 1311 and the connecting rib 1321 can be provided on the top connecting surface of the support platform 131 and the insulating platform 132, or on the side connecting surface.

[0046] Optionally, the connecting groove 1311 and the connecting rib 1321 can be joined by hot-melt connection to form an integral structure.

[0047] It should be noted that the battery cell 100 has two terminals 12, namely a positive terminal and a negative terminal. In this embodiment, the top cover assembly 1 has one terminal 12, and the other terminal is located on the cover assembly on the other side of the battery cell 100.

[0048] The top cover assembly 1 provided by this utility model has a protrusion 13 provided on the side of the pole 12 along the length direction of the top cover body 11. This not only enhances the structural strength of the top cover assembly 1 and thus improves the mechanical strength of the battery cell 100, but also increases the surface area of ​​the top cover body 11, thereby increasing the heat dissipation area of ​​the top cover body 11 and the bonding area with the heat-conducting layer, improving the heat dissipation efficiency of the battery cell 100, controlling the operating temperature of the battery cell 100, and improving the safety performance of the battery cell 100. Furthermore, by providing a support platform 131 and an insulating platform 132 on the protrusion 13, the inner cavity formed by the support platform 131 can accommodate the bent pole tab 21 and the connecting piece 14, which can also improve the production yield of the top cover assembly 1. A connecting groove 1311 is provided on one of the support platform 131 and the insulating platform 132, and a connecting rib 1321 is provided on the other. The connecting rib 1321 is inserted into the connecting groove 1311 to achieve a tight connection between the support platform 131 and the insulating platform 132.

[0049] like Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, the top wall of the insulating platform 132 facing the support platform 131 is provided with a connecting rib 1321, and the inner wall of the support platform 131 facing the insulating platform 132 is provided with a connecting groove 1311.

[0050] Understandably, in this embodiment, both the support platform 131 and the insulating platform 132 are square platforms. Along the length of the top cover body 11, the inner wall of the support platform 131 is provided with a continuous connecting groove 1311, and the top wall of the insulating platform 132 is provided with a continuous connecting rib 1321. When assembling the support platform 131 and the insulating platform 132, the insulating platform 132 is pushed towards the support platform 131, and the connecting rib 1321 is inserted into the connecting groove 1311. The continuous connecting rib 1321 and the connecting groove 1311, through their insertion and engagement, also limit the relative position of the support platform 131 and the insulating platform 132 along the length of the top cover body 11, ensuring the connection stability of the support platform 131 and the insulating platform 132.

[0051] like Figure 6 As shown, along the length of the top cover body 11, the distance from the edge of the connecting groove 1311 to the inner wall of the support platform 131 in this embodiment is L1, which satisfies: 10mm≤L1≤45mm.

[0052] Understandably, in order to ensure that the structural strength of the support platform 131 is not affected after the connecting groove 1311 is opened on the support platform 131, the distance L1 between the edge of the connecting groove 1311 and the inner wall of the support platform 131 in this embodiment needs to meet a certain range.

[0053] Specifically, L1 can be 10mm, 27.5mm, or 45mm.

[0054] like Figure 5 As shown, along the length of the top cover body 11, both ends of the connecting groove 1311 and both ends of the connecting rib 1321 in this embodiment are rounded.

[0055] Understandably, in the case where the connecting groove 1311 is provided along the length of the top cover body 11, in order to avoid stress concentration at the four corners of the connecting groove 1311, this embodiment provides rounded transitions at both ends of the connecting groove 1311 to disperse stress and prevent cracking and damage at the four corners of the connecting groove 1311. Similarly, in this embodiment, the two ends of the connecting rib 1321 are also provided with rounded transitions to achieve a plug-in fit with the connecting groove 1311.

[0056] like Figure 2 and Figure 4 As shown, along the height direction of the top cover body 11, the width of the bottom of the connecting groove 1311 in this embodiment is greater than the width of the groove opening.

[0057] Understandably, in this embodiment, a connecting groove 1311 is provided on the inner wall of the support platform 131, and along the height direction of the top cover body 11, the bottom of the connecting groove 1311 is located above the opening of the connecting groove 1311. The width of the groove bottom is greater than the width of the groove opening, so that when the connecting rib 1321 is inserted into the connecting groove 1311, the contact surface between the connecting rib 1321 and the connecting groove 1311 is not a vertical surface, but an inclined surface sloping from top to bottom towards the connecting rib 1321. The inclined surface makes it difficult for the connecting rib 1321 to fall off from the opening of the connecting groove 1311, thus enhancing the connection stability between the connecting rib 1321 and the connecting groove 1311.

[0058] like Figure 2 and Figure 4 As shown, in this embodiment, half of the difference between the width of the groove opening and the width of the groove bottom is W, which satisfies: 0.25mm≤W≤1.0mm.

[0059] Understandably, since the difference between the opening and the bottom of the connecting groove 1311 cannot be too large or too small, if it is too large, it will be difficult to insert the connecting rib 1321 into the connecting groove 1311, and if it is too small, it will not achieve the effect of limiting the position of the connecting rib 1321 in the vertical direction. Therefore, half of the width difference between the opening and the bottom of the groove in this embodiment needs to meet a certain range.

[0060] Specifically, W can be 0.25mm, 0.625mm, or 1.0mm.

[0061] like Figure 2 and Figure 4 As shown, the support platform 131 in this embodiment includes a folded edge 1312, and the insulating platform 132 includes a support edge 1322.

[0062] The folded edge 1312 is located at one end of the support platform 131 facing the top cover body 11 and is arranged circumferentially around the outer side of the support platform 131; the supporting edge 1322 is located at one end of the insulating platform 132 facing the folded edge 1312 and is arranged circumferentially around the outer side of the insulating platform 132, and supports the side of the folded edge 1312 near the pole group 2.

[0063] Understandably, to enhance the stability of the support platform 131 and the top cover body 11 after installation, this embodiment provides a circumferential flange 1312 at one end of the support platform 131 facing the top cover body 11. The flange 1312 extends radially outward from the center of the inner cavity. The top cover body 11 has a mounting groove corresponding to the position of the inner cavity, and the flange 1312 extends into the mounting groove to achieve a stable connection between the top cover body 11 and the support platform 131.

[0064] Along the height direction of the top cover body 11, the support edge 1322 rests on the lower side of the folded edge 1312, supporting the folded edge 1312 from the bottom. Furthermore, on the horizontal plane, the support edge 1322 also extends into the mounting groove of the top cover body 11, engaging with the mounting groove to strengthen the connection between the boss 13 and the top cover body 11.

[0065] like Figure 5 and Figure 6 As shown, in this embodiment, the folded edge 1312 has a notch 13121 on the side facing the support edge 1322, and the support edge 1322 has a protrusion 13221 on the side facing the folded edge 1312. The protrusion 13221 is inserted into the notch 13121.

[0066] Understandably, due to the abutment of the folded edge 1312 and the support edge 1322, the insertion and engagement of the protrusion 13221 and the notch 13121 can achieve a tight connection between the folded edge 1312 and the support edge 1322. As a supplementary connection structure to the connecting groove 1311 and the connecting rib 1321 of the support platform 131 and the insulating platform 132, the protrusion 13221 and the notch 13121 reinforce the connection between the support platform 131 and the insulating platform 132 from the open end of the protrusion 13, further enhancing the stability of the connection.

[0067] Specifically, multiple notches 13121 and bumps 13221 can be set, or only one can be set.

[0068] like Figure 6As shown, in this embodiment, there are multiple notches 13121 and protrusions 13221, and each notch 13121 and each protrusion 13221 are provided in a one-to-one correspondence.

[0069] The distance between two adjacent notches 13121 along the length of the top cover body 11 is L2, which satisfies: 2mm≤L2≤15mm.

[0070] It is understood that this embodiment has multiple notches 13121 and protrusions 13221. Multiple notches 13121 are respectively located on the folded edge 1312 along the length and width directions of the top cover body 11, and multiple protrusions 13221 are respectively located on the support edge 1322 along the length and width directions of the top cover body 11. The arrangement of multiple notches 13121 and multiple protrusions 13221 allows the folded edge 1312 and the support edge 1322 to be interlocked along both the length and width directions of the top cover body 11, achieving circumferential limiting of the folded edge 1312 and the support edge 1322, and improving the tightness of the connection between the folded edge 1312 and the support edge 1322.

[0071] In order to avoid the notch 13121 on the folded edge 1312 affecting the structural strength of the folded edge 1312, the spacing between two adjacent notches 13121 needs to meet a certain range.

[0072] Specifically, the distance L2 between two adjacent notches 13121 can be 2mm, 8.5mm, or 15mm.

[0073] like Figure 5 and Figure 6 As shown, along the height direction of the top cover body 11, the width of the bottom end of the notch 13121 in this embodiment is greater than the width of the opening end of the notch 13121.

[0074] Understandably, in this embodiment, a notch 13121 is provided in the folded edge 1312, and along the height direction of the top cover body 11, the bottom end of the notch 13121 is located above the opening end of the notch 13121. The width of the bottom end is greater than the width of the opening end, so that when the protrusion 13221 is inserted into the notch 13121, the contact surface between the protrusion 13221 and the notch 13121 is not a vertical surface, but an inclined surface that slopes from top to bottom toward the protrusion 13221. The inclined surface makes it difficult for the protrusion 13221 to fall off from the opening end of the notch 13121, thus enhancing the connection stability between the protrusion 13221 and the notch 13121.

[0075] like Figure 1 As shown, the top cover assembly 1 in this embodiment also includes a connecting block 15.

[0076] The connecting block 15 is located on the side of the top cover body 11 away from the electrode tab 21. The connecting block 15 has a through hole, and the electrode post 12 passes through the through hole and is connected to the connecting block 15.

[0077] It is understood that the connecting block 15 in this embodiment is a strip block, and the through hole is set at the center of symmetry of the strip block. The pole post 12 is connected to the center of symmetry of the strip block through the through hole, which improves the fixing stability of the pole post 12.

[0078] Specifically, the connecting block 15 can be a riveted aluminum block, and the top cover body 11 can be an aluminum plate.

[0079] Secondly, such as Figure 7 , Figure 8 and Figure 9 As shown, this embodiment provides a battery cell 100, including: an electrode group 2, a housing 3, and a top cover assembly 1 as described above.

[0080] The housing 3 has an opening, the top cover assembly 1 is disposed in the opening and surrounds the housing 3 to form a receiving cavity, the pole group 2 is disposed in the receiving cavity, and the pole group 2 is electrically connected to the top cover assembly 1 through the pole tab 21 and the connecting piece 14.

[0081] Specifically, since the battery cell 100 includes a top cover assembly 1, and the specific structure of the top cover assembly 1 is as described in the above embodiments, the battery cell 100 shown in this embodiment includes all the technical solutions of the above embodiments. Therefore, it has at least all the beneficial effects obtained by all the technical solutions of the above embodiments, which will not be described in detail here.

[0082] Understandably, the electrode assembly 2 is installed inside the housing 3, and the top cover assembly 1 is placed over the opening of the housing 3. The electrode assembly 2 is electrically connected to the electrode post 12 of the top cover assembly 1 through the electrode tab 21 to realize the transmission of current. The top cover assembly 1 and the housing 3 constitute the outer shell of the battery cell 100, forming protection for the internal components of the battery cell 100 and being able to withstand a certain amount of external impact.

[0083] In this embodiment, a boss 13 is provided on the top cover body 11. The boss 13 is suitable for supporting and connecting with the battery pack housing, which increases the stress-bearing area of ​​the top cover body 11, avoids the terminal post 12 being subjected to stress alone, and improves the safety performance of the battery cell 100. Furthermore, a support platform 131 and an insulating platform 132 are provided on the boss 13. A connecting groove 1311 is provided on one of the support platform 131 and the insulating platform 132, and a connecting rib 1321 is provided on the other. The connecting rib 1321 is inserted into the connecting groove 1311 to achieve a tight connection between the support platform 131 and the insulating platform 132.

[0084] Thirdly, this embodiment provides a battery pack, including: a busbar, a housing, and the battery cell 100 as described above.

[0085] The housing forms a receiving cavity, and multiple battery cells 100 are provided, with multiple battery cells 100 stacked in the receiving cavity; the busbar is connected to the terminals 12 of the multiple battery cells 100.

[0086] Specifically, since the battery pack includes a cell 100, and the specific structure of the cell 100 is as described in the above embodiments, the battery pack shown in this embodiment includes all the technical solutions of the above embodiments. Therefore, it has at least all the beneficial effects achieved by all the technical solutions of the above embodiments, which will not be described in detail here.

[0087] Understandably, after the battery cells 100 are grouped together within the receiving cavity, the terminal post 12 of each battery cell 100 is welded to the tap on the busbar. The busbar connects the stacked battery cells 100 into groups, and the tap is fixedly connected to the housing through a heat-conducting layer. Because this embodiment provides a protrusion 13 on the side of the terminal post 12, the overall capacity of the battery pack is increased, thereby improving the performance of the battery pack.

[0088] In traditional battery pack structures, the battery pack relies solely on the casing to withstand external impacts. The casing plate opposite the terminal post 12 has a large area, and if its rigidity is insufficient, it is prone to deformation. To prevent casing deformation from causing compression damage to the busbar and terminal post 12, a large space needs to be reserved between the busbar and the casing in the structural design, and supporting foam needs to be installed between them. Some designs also incorporate concave and convex structures on the casing plate to enhance its rigidity and prevent deformation. However, these measures result in a large gap between the cell 100 and the casing, wasting space. Increasing the casing thickness to increase rigidity would increase the weight of the battery pack, hindering lightweight design.

[0089] To address this, this embodiment provides a boss 13 on the outer surface of the top cover body 11. The boss 13 is used to support and connect with the casing, so that the outer shell of the battery cell 100 itself also serves as a supporting load-bearing component. Under the support of the outer shell, large deformation of the casing can be avoided, thereby reducing the thickness of the casing and the weight of the battery pack. Furthermore, while ensuring that the casing does not cause crush damage to the busbars and terminals 12, the distance between the busbars and the casing can be reduced, thereby increasing the volume of the battery cell 100. This fully utilizes the internal space of the casing, increasing the capacity of the battery cell 100 and the energy density of the entire battery pack.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A top cover assembly, applied to a battery cell, characterized in that, include: The top cover body has a first through hole penetrating the top cover body; The electrode post passes through the first through hole and is electrically connected to the electrode tab of the battery cell through a connecting piece; A boss is connected to one side of the top cover body and protrudes outward along the height direction of the top cover body. The boss is adapted to support and connect with the battery pack housing. Along the length direction of the top cover body, the boss is spaced apart from the first through hole. The boss includes a support platform and an insulating platform. The insulating platform is disposed on the inner wall of the support platform, forming an inner cavity at a position away from the support platform. The inner cavity is used to accommodate the electrode tab and the connecting piece. One of the support platform and the insulating platform is provided with a connecting groove, and the other is provided with a connecting rib. The connecting rib is inserted into the connecting groove.

2. The top cover assembly according to claim 1, characterized in that, The top wall of the insulating platform facing the support platform is provided with connecting ribs, and the inner wall of the support platform facing the insulating platform is provided with connecting grooves.

3. The top cover assembly according to claim 2, characterized in that, Along the length of the top cover body, the distance L1 from the edge of the connecting groove to the inner wall of the support platform satisfies: 10mm≤L1≤45mm; And / or, along the length of the top cover body, both ends of the connecting groove and both ends of the connecting rib are rounded.

4. The top cover assembly according to claim 2, characterized in that, Along the height direction of the top cover body, the width of the bottom of the connecting groove is greater than the width of the opening.

5. The top cover assembly according to claim 4, characterized in that, The difference between the width of the groove opening and the width of the groove bottom is half of W, which satisfies: 0.25mm≤W≤1.0mm.

6. The top cover assembly according to claim 2, characterized in that, The support platform includes a folded edge, and the insulating platform includes a supporting edge; The folded edge is located at one end of the support platform facing the top cover body and is arranged circumferentially around the outer side of the support platform; the supporting edge is located at one end of the insulating platform facing the folded edge and is arranged circumferentially around the outer side of the insulating platform, and supports the side of the folded edge near the pole group.

7. The top cover assembly according to claim 6, characterized in that, The folded edge has a notch on the side facing the support edge, and the support edge has a protrusion on the side facing the folded edge, with the protrusion inserted into the notch.

8. The top cover assembly according to claim 7, characterized in that, Multiple notches and protrusions are provided, and each notch and each protrusion is provided in a one-to-one correspondence; The distance between two adjacent notches along the length of the top cover body is L2, which satisfies: 2mm≤L2≤15mm; And / or, along the height direction of the top cover body, the width of the bottom end of the notch is greater than the width of the opening end of the notch.

9. A battery cell, characterized in that, include: The electrode assembly, the housing, and the top cover assembly as described in any one of claims 1 to 8; The housing has an opening, the top cover assembly is disposed in the opening and surrounds the housing to form a receiving cavity, the electrode assembly is disposed in the receiving cavity, and the electrode assembly is electrically connected to the top cover assembly through electrode tabs and connecting pieces.

10. A battery pack, characterized in that, include: Busbar, housing, and battery cell as described in claim 9; The housing forms a receiving cavity, and multiple battery cells are provided, with the multiple battery cells stacked in the receiving cavity; the busbar is connected to the terminals of the multiple battery cells.

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