Top cover assembly, battery cell and battery pack

Abstract

The invention relates to the technical field of batteries, and provides a top cover assembly, a battery cell and a battery pack, the top cover assembly comprises a top cover body, a pole, a boss and a connecting sheet; a first through hole penetrating through the top cover body is formed in the top cover body; the pole penetrates through the first through hole and is electrically connected with the tab of the battery cell through the connecting sheet; the boss is connected to one side of the top cover body and protrudes outwards in the height direction of the top cover body, and the boss is suitable for being connected with a box body of the battery pack in a supporting mode; the bosses and the first through holes are arranged at intervals in the length direction of the top cover body; the boss comprises a supporting table and an insulating table, the insulating table is arranged on the inner wall of the supporting table, an inner cavity is formed in the position, away from the supporting table, of the insulating table, and the inner cavity is used for containing the tab and the connecting piece; and ribs are arranged on the outer surface of the supporting table. According to the top cover assembly, the use temperature of the battery cell is controlled, and the safety performance of the battery cell is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly 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. Summary of the Invention

[0004] This invention 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 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, the present invention provides a top cover assembly, comprising: The top cover body has a first through hole penetrating the top cover body; The electrode post is inserted through the first through hole and 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, and an inner cavity is formed at the position of the insulating platform away from the support platform. The inner cavity is used to accommodate the electrode tab and the connecting piece. Ribs are provided on the outer surface of the support platform.

[0006] According to a top cover assembly provided by the present invention, the ribs extend along the length direction of the top cover body, and a plurality of ribs are provided, wherein the plurality of ribs are arranged at intervals along the width direction of the top cover body.

[0007] According to a top cover assembly provided by the present invention, a plurality of the ribs are evenly spaced apart, and the spacing between adjacent ribs along the width direction of the top cover body is b, satisfying: 2mm≤b≤5mm.

[0008] According to a top cover assembly provided by the present invention, the number of ribs is n, the width of the ribs is a, the length of the outer surface of the boss along the length direction of the top cover body is m, and the ratio of the total width na of the plurality of ribs to m satisfies the following range: 10%≤na / m≤30%.

[0009] According to a top cover assembly provided by the present invention, the height of the rib along the height direction of the top cover body is h, which satisfies: 0.35mm≤h≤0.8mm; Along the width direction of the top cover body, the width of the rib is a, which satisfies: 0.6mm≤a≤1.5mm; And / or, the sum of the projected areas of the plurality of said ribs on the top cover body is S0, and the outer surface area of ​​the boss is S, satisfying: 8%≤S0 / S≤25%.

[0010] According to a top cover assembly provided by the present invention, along the height direction of the top cover body, the height of the pole above the top cover body is H1, and the height of the boss is H2, wherein H1 and H2 satisfy: 1.5mm≤H2-H1≤3.0mm; And / or, the length of the top cover body is L, where L satisfies: 80mm≤L≤190mm; The width of the top cover body is W, where W satisfies: 12mm≤W≤25mm; The boss has a length of L1 and a width of W1, satisfying the following conditions: 0.3≤L1 / L≤0.45, 0.55≤W1 / W≤0.80.

[0011] According to a top cover assembly provided by the present invention, the insulating platform is provided with a connecting rib on the side facing the support platform, and the support platform is provided with a connecting groove on the side facing the insulating platform, and the connecting rib is inserted into the connecting groove.

[0012] According to a top cover assembly provided by the present invention, 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 top cover body and is arranged circumferentially around the outer side of the insulating platform, and supports the side of the folded edge near the pole group. 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.

[0013] In a second aspect, the present invention 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, the present invention provides a battery pack, comprising: a busbar, a housing, and 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 invention, by providing protrusions along the length of the top cover body on the side of the terminal post, not only enhance the structural strength of the top cover assembly and thus improve the mechanical strength of the battery cell, but also increase the surface area of ​​the top cover body, thereby increasing the heat dissipation area and the bonding area with the thermally conductive 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 providing support platforms and insulating platforms on the protrusions, the inner cavity formed by the support platforms can accommodate the bent electrode tabs and connecting pieces, and the ribs provided on the outer surface of the support platforms increase the surface area of ​​the top cover body, thereby increasing the heat dissipation area and the bonding area with the thermally conductive 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. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention 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 invention. 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 the present invention.

[0018] Figure 2 This is a top view of the top cover assembly provided by the present invention.

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

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

[0021] Figure 5 This is a three-dimensional structural diagram of the boss provided by the present invention.

[0022] Figure 6 This is the second three-dimensional structural schematic diagram of the top cover assembly provided by the present invention.

[0023] Figure 7 This is a bottom view of the top cover assembly provided by the present invention.

[0024] Figure 8 This invention provides Figure 7 CC section view.

[0025] Figure 9 This is a three-dimensional structural diagram of the battery cell provided by the present invention.

[0026] Figure 10 A partial view of the cross-sectional view of the battery cell provided by the present invention.

[0027] 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. Rib; 1313. Folded edge; 1321. Connecting rib; 1322. Support edge; 13221. Protrusion; 2. Electrode group; 21. Electrode ear; 3. Shell; 100. Battery cells. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of the present invention 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 the present invention. 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.

[0030] In the description of the embodiments of the present invention, 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 the present invention according to the specific circumstances.

[0031] In embodiments of the present invention, 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," "over," and "on top" of 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.

[0032] 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.

[0033] The following is combined with Figures 1 to 10 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.

[0034] Firstly, such as Figure 1 , Figure 2 and Figure 4 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.

[0035] The top cover body 11 has a first through hole that penetrates the top cover body 11.

[0036] 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.

[0037] 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 for support. 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 insulating platform 132 forms an inner cavity away from the support platform 131. The inner cavity is used to accommodate the tab 21 and the connecting piece 14. Ribs 1311 are provided on the outer surface of the support platform 131.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] like Figure 6As shown, the top cover assembly 1 in this embodiment also includes a connecting piece 14. The connecting piece 14 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 arranged in parallel.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Furthermore, to increase the outer surface area of ​​the support platform 131, this embodiment provides ribs 1311 on the outer surface of the support platform 131. The ribs 1311 can improve the structural strength of the support platform 131, ensuring that the structure of the boss 13 is more stable when subjected to external impact. In addition, the ribs 1311 can increase the outer surface area of ​​the support platform 131, thereby increasing the heat dissipation area of ​​the boss 13 and the bonding area with the heat-conducting layer, further improving the safety performance of the battery cell 100.

[0046] Specifically, the reinforcing rib 1311 can extend along a straight line, a broken line, or an arc. There can be one or more reinforcing ribs 1311.

[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 the present invention, by providing a protrusion 13 on the side of the pole 12 along the length direction of the top cover body 11, not only enhances the structural strength of the top cover assembly 1 through the protrusion 13, thereby improving the mechanical strength of the battery cell 100, but also increases the surface area of ​​the top cover body 11 through the protrusion 13, 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, and ribs 1311 are provided on the outer surface of the support platform 131, thereby increasing the surface area of ​​the top cover body 11 through the ribs 1311, 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.

[0049] like Figure 1 , Figure 7 and Figure 8 As shown, in this embodiment, the ribs 1311 extend along the length direction of the top cover body 11, and there are multiple ribs 1311. The multiple ribs 1311 are arranged at intervals along the width direction of the top cover body 11.

[0050] Understandably, in order to improve the structural strength of the boss 13 and prevent stress concentration or deformation when the boss 13 is under load, multiple ribs 1311 are provided at intervals on the outer surface of the boss 13. The multiple ribs 1311 are arranged along the width direction of the top cover body 11, which allows the ribs 1311 to cover the entire width of the boss 13, improve the overall lateral rigidity and bending resistance of the boss 13, prevent the boss 13 from bending or sagging along the width direction, improve load distribution, and facilitate processing and manufacturing.

[0051] like Figure 2 As shown, in this embodiment, multiple ribs 1311 are evenly spaced. Along the width direction of the top cover body 11, the spacing between adjacent ribs 1311 is b, which satisfies: 2mm≤b≤5mm.

[0052] It is understood that in this embodiment, multiple ribs 1311 are evenly spaced along the width direction of the top cover body 11 to improve the uniformity of the strength of the outer surface of the boss 13.

[0053] Specifically, the spacing b between adjacent reinforcing bars 1311 can be 2mm, 3.5mm, or 5mm.

[0054] like Figure 2 As shown, the number of ribs 1311 in this embodiment is n, the width of rib 1311 is a, the length of the outer surface of the boss 13 along the length direction of the top cover body 11 is m, and the ratio of the total width na of the multiple ribs 1311 to m satisfies the following range: 10%≤na / m≤30%.

[0055] Understandably, in this embodiment, the ribs 1311 extend along the length of the top cover body 11. The ribs 1311 are not only distributed on the top surface of the boss 13, but also on its sides. Ribs 1311 connect the two sides of the boss 13 to its top surface on its outer surface. Along the length of the top cover body 11, the length m of the outer surface of the boss 13 refers to the sum of the length of the boss 13 and the lengths of its two sides. The total width of the multiple ribs 1311 is na, and na / m refers to the ratio of the total width of the ribs 1311 to the length of the outer surface of the boss 13. When the ratio of the total width of the ribs 1311 to the length of the outer surface of the boss 13 is within a selected range, the outer surface temperature of the battery cell 100 during cycling can be reasonably controlled, extending the service life of the battery cell 100.

[0056] Specifically, na / m can be 10%, 20%, or 30%.

[0057] like Figure 2 and Figure 4 As shown, along the height direction of the top cover body 11, the height of the rib 1311 in this embodiment is h, which satisfies: 0.35mm≤h≤0.8mm.

[0058] Along the width direction of the top cover body 11, the width of the rib 1311 is a, which satisfies: 0.6mm≤a≤1.5mm.

[0059] Understandably, the height of rib 1311 is the height of the projection of rib 1311 toward the height direction of the top cover body 11, that is, the distance between the top surface of the boss 13 and the highest point of rib 1311. The width of rib 1311 is the projection width of rib 1311 toward the top surface of the boss 13.

[0060] Specifically, the height of the reinforcing rib 1311 can be 0.35mm, 0.575mm, or 0.8mm. The width 'a' of the reinforcing rib 1311 can be 0.6mm, 1.05mm, or 1.5mm.

[0061] like Figure 1As shown, in this embodiment, the sum of the projected areas of the multiple ribs 1311 on the top cover body 11 is S0, and the outer surface area of ​​the boss 13 is S, satisfying: 8%≤S0 / S≤25%.

[0062] Understandably, since the ribs 1311 can adhere the structural adhesive layer for heat dissipation, and the ratio of the sum of the areas of multiple ribs 1311 to the outer surface area of ​​the boss 13 is within a selected range, the outer surface temperature of the cell 100 during the cycle can be reasonably controlled, thus extending the service life of the cell 100.

[0063] Specifically, S0 / S can be 8%, 16.5%, or 25%.

[0064] like Figure 2 and Figure 3 As shown, along the height direction of the top cover body 11, the height of the pole post 12 above the top cover body 11 in this embodiment is H1, and the height of the boss 13 is H2. H1 and H2 satisfy: 1.5mm≤H2-H1≤3.0mm.

[0065] Understandably, when the battery cell 100 is assembled into a battery cell module, in order to avoid the electrode post 12 being subjected to force, in this embodiment, on the side of the top cover body 11 away from the electrode tab 21, the height of the boss 13 is slightly higher than the total height after the electrode post 12 is welded to the tab. The force on the battery cell module is transmitted to the top cover body 11 through the boss 13, which improves the strength of the battery cell 100.

[0066] Specifically, H2-H1 can be 1.5mm, 2.25mm, or 3.0mm.

[0067] like Figure 2 As shown, the length of the top cover body 11 in this embodiment is L, and L satisfies: 80mm≤L≤190mm.

[0068] The width of the top cover body 11 is W, and W satisfies: 12mm≤W≤25mm.

[0069] The boss 13 has a length of L1 and a width of W1, satisfying the following conditions: 0.3≤L1 / L≤0.45, 0.55≤W1 / W≤0.80.

[0070] Understandably, this embodiment limits the length and width of the top cover body 11, and limits the ratio of the length of the boss 13 to the length of the top cover body 11, as well as the ratio of the width of the boss 13 to the width of the top cover body 11. When the boss 13 is provided on the top cover body 11, a certain distance needs to be reserved around the boss 13 to facilitate the processing of the boss 13 and to ensure the structural strength of the top cover body 11.

[0071] Specifically, the length L of the top cover body 11 can be 80mm, 135mm, or 190mm. The width W of the top cover body 11 can be 12mm, 18.5mm, or 25mm. L1 / L can be 0.3, 0.375, or 0.45. W1 / W can be 0.55, 0.675, or 0.80.

[0072] like Figure 2 and Figure 4 As shown, in this embodiment, the insulating platform 132 is provided with a connecting rib 1321 on the side facing the support platform 131, and the support platform 131 is provided with a connecting groove on the side facing the insulating platform 132, and the connecting rib 1321 is inserted into the connecting groove.

[0073] Understandably, in order to further improve the connection strength between the support platform 131 and the insulating platform 132, this embodiment provides a connecting rib 1321 on the insulating platform 132 and a connecting groove on the support platform 131. Through the insertion and engagement of the connecting groove and the connecting rib 1321, the stability and reliability of the connection between the support platform 131 and the insulating platform 132 are achieved.

[0074] Specifically, the connecting groove and connecting rib 1321 can be a single continuous groove or multiple grooves and connecting ribs 1321 arranged at intervals. The connecting groove and connecting rib 1321 can be set on the top connecting surface of the support platform 131 and the insulating platform 132, or on the side connecting surface.

[0075] Optionally, the connecting groove and the connecting rib 1321 can be joined by hot-melt connection to form an integral structure.

[0076] 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 has a continuous connecting groove, and the top wall of the insulating platform 132 has 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. The continuous connecting rib 1321 and the connecting groove 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.

[0077] like Figure 2 and Figure 4 As shown, along the length of the top cover body 11, both ends of the connecting groove and both ends of the connecting rib 1321 in this embodiment are rounded.

[0078] Understandably, in the case where the connecting groove runs along the length of the top cover body 11, in order to avoid stress concentration at the four corners of the connecting groove, this embodiment provides rounded transitions at both ends of the connecting groove to disperse stress and prevent cracking and damage at the four corners of the connecting groove. 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.

[0079] 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 in this embodiment is greater than the width of the groove opening.

[0080] Understandably, in this embodiment, a connecting groove 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 is located above the opening of the connecting groove. 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, the contact surface between the connecting rib 1321 and the connecting groove is not a vertical surface, but an inclined surface sloping downwards 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, thus enhancing the connection stability between the connecting rib 1321 and the connecting groove.

[0081] like Figure 2 , Figure 4 and Figure 5 As shown, the support platform 131 in this embodiment includes a folded edge 1313, and the insulating platform 132 includes a support edge 1322.

[0082] The folded edge 1313 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 top cover body 11 and is arranged circumferentially around the outer side of the insulating platform 132, and supports the side of the folded edge 1313 near the pole group 2.

[0083] The folded edge 1313 has a notch on the side facing the support edge 1322, and the support edge 1322 has a protrusion 13221 on the side facing the folded edge 1313. The protrusion 13221 is inserted into the notch.

[0084] Understandably, to enhance the stability of the support platform 131 and the top cover body 11 after installation, this embodiment provides a circumferential flange 1313 at one end of the support platform 131 facing the top cover body 11. The flange 1313 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 1313 extends into the mounting groove to achieve a stable connection between the top cover body 11 and the support platform 131.

[0085] Along the height direction of the top cover body 11, the support edge 1322 rests on the lower side of the folded edge 1313, supporting the folded edge 1313 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.

[0086] Due to the abutment of the folded edge 1313 and the support edge 1322, and the insertion and engagement of the protrusion 13221 and the notch, a tight connection between the folded edge 1313 and the support edge 1322 can be achieved. As a supplementary connection structure to the connecting groove and connecting rib 1321 of the support platform 131 and the insulating platform 132, the protrusion 13221 and the notch 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.

[0087] In this embodiment, there are multiple notches and protrusions 13221, and each notch and each protrusion 13221 are provided in a one-to-one correspondence.

[0088] It is understood that this embodiment has multiple notches and protrusions 13221. Multiple notches are located on the folded edge 1313 along the length and width directions of the top cover body 11, and multiple protrusions 13221 are located on the support edge 1322 along the length and width directions of the top cover body 11. The arrangement of multiple notches and protrusions 13221 allows the folded edge 1313 and the support edge 1322 to interlock and engage along both the length and width directions of the top cover body 11, achieving circumferential positioning of the folded edge 1313 and the support edge 1322 and improving the tightness of their connection.

[0089] Along the height direction of the top cover body 11, the width of the bottom end of the notch in this embodiment is greater than the width of the opening end of the notch.

[0090] Understandably, because a notch is provided in the folded edge 1313 in this embodiment, the bottom end of the notch is located above the opening end of the notch along the height direction of the top cover body 11. 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, the contact surface between the protrusion 13221 and the notch is not a vertical surface, but an inclined surface sloping from top to bottom towards the protrusion 13221. The inclined surface makes it difficult for the protrusion 13221 to fall off from the opening end of the notch, thus enhancing the connection stability between the protrusion 13221 and the notch.

[0091] like Figure 1 As shown, the top cover assembly 1 in this embodiment also includes a connecting block 15.

[0092] 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.

[0093] 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.

[0094] Specifically, the connecting block 15 can be a riveted aluminum block, and the top cover body 11 can be an aluminum plate.

[0095] Secondly, such as Figure 9 and Figure 10 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] In this embodiment, a boss 13 is provided on the top cover body 11. The boss 13 is suitable for connection with the battery pack housing support, 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, and ribs 1311 are provided on the outer surface of the support platform 131. The ribs 1311 increase 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.

[0100] As shown in Table 1, the production line of this embodiment tests various indicators of the battery cell 100 to verify the technical effects of different data. The height h of the rib 1311, the width a of the rib 1311, the spacing b between adjacent ribs 1311, the ratio na / m of the total width of multiple ribs 1311 to the outer surface length of the boss 13, and the ratio S0 / S of the area of ​​the rib 1311 to the outer surface area of ​​the boss 13 are changed in sequence to perform simulation analysis on the battery cell 100.

[0101] It is evident that when the rib 1311 structural design meets the above requirements, the outer surface temperature of the cell 100 during cycling can be controlled below 55℃, which is 5-15℃ lower than existing technologies. When the height, quantity, or width of the rib 1311 is insufficient, resulting in an insufficient proportion of the rib 1311's width or area, the temperature rise will be relatively higher.

[0102] Table 1

[0103] Thirdly, this embodiment provides a battery pack, including: a busbar, a housing, and the battery cell 100 as described above.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

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, and an inner cavity is formed at the position of the insulating platform away from the support platform. The inner cavity is used to accommodate the electrode tab and the connecting piece. Ribs are provided on the outer surface of the support platform.

2. The top cover assembly according to claim 1, characterized in that, The ribs extend along the length of the top cover body, and there are multiple ribs, which are arranged at intervals along the width of the top cover body.

3. The top cover assembly according to claim 2, characterized in that, The ribs are evenly spaced and arranged along the width of the top cover body. The spacing between adjacent ribs is b, which satisfies: 2mm≤b≤5mm.

4. The top cover assembly according to claim 2, characterized in that, The number of ribs is n, the width of the ribs is a, the length of the outer surface of the boss along the length direction of the top cover body is m, and the ratio of the total width na of the plurality of ribs to m satisfies the following range: 10%≤na / m≤30%.

5. The top cover assembly according to claim 2, characterized in that, Along the height direction of the top cover body, the height of the rib is h, which satisfies: 0.35mm≤h≤0.8mm; Along the width direction of the top cover body, the width of the rib is a, which satisfies: 0.6mm≤a≤1.5mm; And / or, the sum of the projected areas of the plurality of said ribs on the top cover body is S0, and the outer surface area of ​​the boss is S, satisfying: 8%≤S0 / S≤25%.

6. The top cover assembly according to claim 1, characterized in that, Along the height direction of the top cover body, the pole is higher than the top cover body by a height of H1, and the boss is higher by a height of H2. H1 and H2 satisfy: 1.5mm≤H2-H1≤3.0mm; And / or, the length of the top cover body is L, where L satisfies: 80mm≤L≤190mm; The width of the top cover body is W, where W satisfies: 12mm≤W≤25mm; The boss has a length of L1 and a width of W1, satisfying the following conditions: 0.3≤L1 / L≤0.45, 0.55≤W1 / W≤0.

80.

7. The top cover assembly according to claim 1, characterized in that, The insulating platform has a connecting rib on the side facing the support platform, and the support platform has a connecting groove on the side facing the insulating platform, with the connecting rib inserted into the connecting groove.

8. The top cover assembly according to claim 7, 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 top cover body and is arranged circumferentially around the outer side of the insulating platform, and supports the side of the folded edge near the pole group. 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.

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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