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, upper plastic 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 connected with the pole lug of electric core electricity through the connecting piece, the boss is suitable for with the box body support connection of battery package, the boss is arranged with the first through -hole interval, the boss includes the side wall and the cover, the side wall is surrounded in the one side of top cover body away from the pole lug, the cover is covered in the open end of side wall to form the inner chamber, and the inner chamber is used for accommodating the pole lug and the connecting piece, the upper plastic is located in the one side of top cover body away from the pole lug, and the upper plastic has the accommodating platform with the corresponding position of boss, the accommodating platform covers sets up in the outer side wall of boss, and the accommodating platform has the second through -hole, and the second through -hole is opposite to the setting of cover. The utility model improves the safety performance of electric core, and reduces the cost of electric core.

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 be supported and connected to 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 side wall and a cover. The side wall surrounds the side of the top cover body away from the electrode tab. The cover covers the opening end of the side wall to form an inner cavity for accommodating the electrode tab and the connecting piece. An upper plastic is provided on the side of the top cover body away from the tab. The upper plastic has a receiving platform at the position corresponding to the boss. The receiving platform covers the outer side wall of the boss. The receiving platform has a second through hole. The second through hole is arranged opposite to the cover body. The cover body is exposed in the second through hole along the height direction of the top cover body.

[0006] According to the present invention, a top cover assembly further includes: a connecting block; The connecting block is located on the side of the top cover body away from the electrode tab. The connecting block has a through hole, and the upper plastic has a third through hole. The electrode post passes through the third through hole and the through hole and is connected to the connecting block.

[0007] According to the present invention, a top cover assembly is provided, wherein the upper plastic has a baffle at the position corresponding to the connecting block, and the baffle is arranged around the outside of the connecting block along the circumference of the connecting block.

[0008] According to the top cover assembly provided by this utility model, the upper plastic also includes: a first positioning post; The first positioning post protrudes from the upper plastic on the side facing the connecting block and is located beside the third through hole. The connecting block is provided with a first positioning hole, and the first positioning post is inserted into the first positioning hole.

[0009] According to the top cover assembly provided by this utility model, the upper plastic also includes: a second positioning post; The second positioning post protrudes from the side of the upper plastic facing the top cover body and is located beside the third through hole and is staggered with the first positioning post. The top cover body is provided with a second positioning hole, and the second positioning post is inserted into the second positioning hole.

[0010] According to the top cover assembly provided by this utility model, the wall thickness of the upper plastic in the baffle area and the thickness of the baffle are both T, satisfying: 1.0mm≤T≤2.0mm; The wall thickness of the upper plastic in the area not covered by the baffle is t, which satisfies: 0.2mm≤t≤0.5mm.

[0011] According to the present invention, in the height direction of the top cover body, the side of the cover body away from the tab is lower than the top surface of the receiving platform to form a recessed cavity for accommodating the thermally conductive adhesive layer.

[0012] According to the present invention, the depth of the recessed cavity along the height direction of the top cover body is h, which satisfies: 0.3mm≤h≤0.8mm.

[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 feature a protrusion along the length of the top cover body, located beside the terminal post. This not only enhances the structural strength of the top cover assembly and 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 and the bonding area with the heat-conducting layer, improving the heat dissipation efficiency of the battery cell, controlling its operating temperature, and enhancing its safety performance. Furthermore, by hollowing out the protrusion, the cavity formed by the sidewall and the cover body can accommodate the bent electrode tabs and connecting pieces, improving the production yield of the top cover assembly. Additionally, a plastic layer is provided on the side of the top cover body away from the electrode tabs, extending along the length of the top cover body and featuring a receiving platform to enclose the protrusion for insulation protection, effectively insulating the top cover body and reducing the cost of the battery cell. 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 a three-dimensional structural diagram of the top cover assembly provided by this utility model.

[0018] Figure 2 This is one of the three-dimensional structural diagrams of the lower plastic provided by this utility model.

[0019] Figure 3 This is the second three-dimensional structural diagram of the lower plastic provided by this utility model.

[0020] Figure 4 This is a top view of the lower plastic provided by this utility model.

[0021] Figure 5 This utility model provides Figure 4 AA sectional view.

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

[0023] Figure 7This is a cross-sectional view of the battery cell provided by this utility model.

[0024] Figure 8 This utility model provides Figure 7 Enlarged view of the V section.

[0025] Figure label: 1. Top cover assembly; 11. Top cover body; 12. Pole post; 13. Boss; 14. Connecting piece; 15. Upper plastic; 16. Connecting block; 131. Side wall; 132. Cover body; 151. Receiving platform; 152. Third through hole; 153. Baffle wall; 154. First positioning post; 155. Second positioning post; 1511. Second through hole; 2. Electrode group; 21. Electrode ear; 3. Shell; 100. Battery cells. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] The following is combined Figures 1 to 8 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.

[0032] Firstly, such as Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a top cover assembly 1, including: a top cover body 11, a pole post 12, a boss 13, an upper plastic piece 15, and a connecting piece 14.

[0033] The top cover body 11 has a first through hole that penetrates the top cover body 11.

[0034] 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.

[0035] 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 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 side wall 131 and a cover 132. The side wall 131 surrounds the side of the top cover body 11 away from the tab 21. The cover 132 covers the opening end of the side wall 131 to form an inner cavity. The inner cavity is used to accommodate the tab 21 and the connecting piece 14.

[0036] The upper plastic 15 is located on the side of the top cover body 11 away from the tab 21. The upper plastic 15 has a receiving platform 151 at the position corresponding to the boss 13. The receiving platform 151 covers the outer wall 131 of the boss 13. The receiving platform 151 has a second through hole 1511. The second through hole 1511 is arranged opposite to the cover body 132. The cover body 132 is exposed in the second through hole 1511 along the height direction of the top cover body 11.

[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] like Figure 7 and Figure 8 As 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.

[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, such as Figure 7 and Figure 8As shown, in this embodiment, the boss 13 is set separately, with the side wall 131 surrounding one side of the top cover body 11. The cover body 132 is welded and fixed to the side wall 131, and the side wall 131 and the cover body 132 together form an inner cavity. Because the boss 13 is set separately, the dimensions of the side wall 131 and the cover body 132 can be reasonably set, making the shape of the boss 13 easier to control, improving the production yield of the top cover assembly 1, and ensuring the structural strength of the top cover assembly 1.

[0043] 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.

[0044] Furthermore, to effectively insulate the side of the top cover body 11 away from the tab 21, this embodiment provides an upper plastic 15 on one side of the top cover body 11. For fitment with the protrusion 13, the upper plastic 15 is provided with a receiving platform 151, which covers the protrusion 13 and insulates the sidewall 131 of the protrusion 13. To facilitate assembly of the cover 132 with the sidewall 131, the receiving platform 151 has a second through hole 1511 corresponding to the position of the cover 132, allowing the cover 132 to protrude from the receiving platform 151 and be supported and connected to the battery pack housing.

[0045] Compared to the prior art where an additional top patch is set to achieve insulation of the top cover body 11, since the upper plastic 15 of this embodiment has a continuous arrangement along the length direction of the top cover body 11, and a receiving platform 151 is provided at the protrusion 13 of the top cover body 11 for insulation protection, this embodiment can eliminate the setting of the top patch, improve the assembly efficiency of the upper plastic 15 and the top cover body 11, reduce the cost of the battery cell 100, and improve the product competitiveness of the battery cell 100.

[0046] Specifically, the top wall of the receiving platform 151 in this embodiment has a circumferentially arranged baffle. The baffle is arranged parallel to one side of the top cover body 11, and a second through hole 1511 is formed at the center of the baffle along the circumference. The baffle can stop and limit the boss 13 from the top of the receiving platform 151, thereby enhancing the stability of the receiving platform 151.

[0047] The top cover assembly 1 provided by this utility model, by providing a protrusion 13 on the side of the electrode post 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 hollowing out the protrusion 13, the inner cavity formed by the side wall 131 and the cover 132 can not only accommodate the bent electrode 21 and the connecting piece 14, but also improve the production yield of the top cover assembly 1. Additionally, a plastic 15 is provided on the side of the top cover body 11 away from the electrode 21. The plastic 15 is arranged along the length of the top cover body 11 and has a receiving platform 151 that covers the protrusion 13 for insulation protection, which effectively insulates the top cover body 11 and reduces the cost of the battery cell 100.

[0048] like Figure 7 As shown, the top cover assembly 1 in this embodiment also includes a connecting block 16.

[0049] The connecting block 16 is located on the side of the top cover body 11 away from the electrode tab 21. The connecting block 16 has a through hole, and the upper plastic 15 has a third through hole 152. The electrode post 12 passes through the third through hole 152 and the through hole and is connected to the connecting block 16.

[0050] It is understood that the connecting block 16 in this embodiment is a strip block. The upper plastic 15 is provided with a third through hole 152 corresponding to the position of the pole post 12. The through hole is set at the center of symmetry of the strip block. The center of the third through hole 152 and the center of the through hole coincide. 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.

[0051] Specifically, the connecting block 16 can be a riveted aluminum block, and the top cover body 11 can be an aluminum plate.

[0052] like Figure 2 As shown, in this embodiment, the upper plastic 15 has a baffle 153 at the position corresponding to the connecting block 16, and the baffle 153 is arranged around the outside of the connecting block 16 along the circumference of the connecting block 16.

[0053] It is understood that the connecting block 16 in this embodiment is a strip block, and correspondingly, the baffle 153 is arranged in a square cavity. The square cavity can both limit the position of the connecting block 16 and insulate the surrounding area of ​​the connecting block 16.

[0054] Furthermore, the inner side of the baffle 153 has a stepped inner wall that is adapted to the outer wall of the connecting block 16.

[0055] like Figure 2As shown, the upper plastic 15 in this embodiment also includes a first positioning post 154.

[0056] The first positioning post 154 protrudes from the side of the upper plastic 15 facing the connecting block 16 and is located beside the third through hole 152. The connecting block 16 is provided with a first positioning hole, and the first positioning post 154 is inserted into the first positioning hole.

[0057] Understandably, the first positioning post 154 is used for the fixed connection between the upper plastic 15 and the connecting block 16. Based on the insertion of the first positioning post 154 and the first positioning hole, it is beneficial to quickly position the connecting block 16 and the upper plastic 15 during assembly, thereby improving assembly efficiency.

[0058] Furthermore, in this embodiment, the first positioning post 154 is a cylindrical structure, and there are two first positioning posts 154. The two first positioning posts 154 are respectively located on both sides of the third through hole 152. The two first positioning posts 154 constrain the rotation and movement of the connecting block 16 relative to the upper plastic 15, thereby enhancing the connection reliability between the upper plastic 15 and the connecting block 16.

[0059] like Figure 3 As shown, the upper plastic 15 in this embodiment also includes a second positioning post 155.

[0060] The second positioning post 155 protrudes from the side of the upper plastic 15 facing the top cover body 11, and is located beside the third through hole 152 and is staggered with the first positioning post 154. The top cover body 11 is provided with a second positioning hole, and the second positioning post 155 is inserted into the second positioning hole.

[0061] Understandably, the second positioning post 155 is used for the fixed connection between the upper plastic 15 and the top cover body 11. The insertion of the second positioning post 155 and the second positioning hole facilitates rapid positioning during the assembly of the top cover body 11 and the upper plastic 15, improving assembly efficiency. Furthermore, along the height direction of the top cover body 11, the second positioning post 155 and the first positioning post 154 are staggered and not coaxial. Relative to both sides of the upper plastic 15, the first positioning post 154 and the second positioning post 155 can be positioned at two locations beside the third through hole 152, enhancing the connection reliability of the upper plastic 15.

[0062] Furthermore, in this embodiment, the second positioning post 155 is a cylindrical structure, and there are two second positioning posts 155. The two second positioning posts 155 are respectively located on both sides of the third through hole 152. The two second positioning posts 155 constrain the rotation and movement of the top cover body 11 relative to the upper plastic 15, thereby enhancing the connection reliability between the upper plastic 15 and the top cover body 11.

[0063] like Figure 4 and Figure 5As shown, in this embodiment, the wall thickness of the upper plastic 15 in the region of the baffle 153 and the thickness of the baffle 153 are both T, satisfying: 1.0mm≤T≤2.0mm.

[0064] The wall thickness of the upper plastic 15 in the non-baffle 153 region is t, which satisfies: 0.2mm≤t≤0.5mm.

[0065] Understandably, because the terminal post 12 area of ​​the upper plastic 15 is subjected to instantaneous impact, and to avoid short circuits caused by contact between the terminal post 12 and the top cover body 11, the wall thickness of the upper plastic 15 in the baffle 153 area and the thickness T of the baffle 153 in this embodiment need to meet certain ranges. Furthermore, the non-baffle 153 area of ​​the upper plastic 15 needs to provide insulation protection for the top cover assembly 1 and the boss 13, which also needs to meet certain ranges. Because the upper plastic 15 experiences greater stress and insulation requirements in the baffle 153 area, the wall thickness T of the upper plastic 15 in the baffle 153 area is greater than the wall thickness t in the non-baffle 153 area.

[0066] Specifically, the wall thickness T of the upper plastic 15 located in the area of ​​the baffle 153 can be 1.0 mm, 1.5 mm, or 2.0 mm. The wall thickness t of the upper plastic 15 located in the area not of the baffle 153 can be 0.2 mm, 0.35 mm, or 0.5 mm.

[0067] like Figure 7 As shown, along the height direction of the top cover body 11, the side of the cover 132 opposite to the tab 21 in this embodiment is lower than the top surface of the receiving platform 151 to form a recessed cavity for accommodating the thermally conductive adhesive layer.

[0068] Understandably, after the cover 132 is assembled with the side wall 131, the top wall of the cover 132 is lower than the top surface of the receiving platform 151, and the top surface of the cover 132 and the inner wall of the receiving platform 151 form a recessed cavity. The recessed cavity is used to accommodate the thermally conductive adhesive layer, so as to facilitate the connection between the boss 13 and the battery pack housing support.

[0069] like Figure 7 and Figure 8 As shown, along the height direction of the top cover body 11, the depth of the recessed cavity in this embodiment is h, which satisfies: 0.3mm≤h≤0.8mm.

[0070] Understandably, since the boss 13 supports the battery pack housing and bears the supporting force, the depth of the recessed cavity needs to meet a certain range to ensure that the supporting function of the boss 13 is not affected and that it can accommodate a certain amount of thermally conductive adhesive layer.

[0071] Specifically, the depth h of the recessed cavity can be 0.3 mm, 0.55 mm, or 0.8 mm.

[0072] Secondly, such as Figure 6 and Figure 7 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In this embodiment, a protrusion 13 is provided on the top cover body 11. The protrusion 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 pole post 12 being subjected to stress alone, and improves the safety performance of the battery cell 100. Furthermore, a side wall 131 and a cover body 132 are provided on the protrusion 13, and the formed inner cavity can accommodate the bent pole tab 21 and connecting piece 14. A plastic 15 is also provided on the side of the top cover body 11 away from the pole tab 21. The plastic 15 is arranged along the length of the top cover body 11, and a receiving platform 151 is provided to cover the protrusion 13 for insulation protection, which effectively insulates the top cover body 11 and reduces the cost of the battery cell 100.

[0077] Thirdly, this embodiment provides a battery pack, including: a busbar, a housing, and the battery cell 100 as described above.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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 be supported and connected to 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 side wall and a cover. The side wall surrounds the side of the top cover body away from the electrode tab. The cover covers the opening end of the side wall to form an inner cavity for accommodating the electrode tab and the connecting piece. An upper plastic is provided on the side of the top cover body away from the tab. The upper plastic has a receiving platform at the position corresponding to the boss. The receiving platform covers the outer side wall of the boss. The receiving platform has a second through hole. The second through hole is arranged opposite to the cover body. The cover body is exposed in the second through hole along the height direction of the top cover body.

2. The top cover assembly according to claim 1, characterized in that, Also includes: Connector block; The connecting block is located on the side of the top cover body away from the electrode tab. The connecting block has a through hole, and the upper plastic has a third through hole. The electrode post passes through the third through hole and the through hole and is connected to the connecting block.

3. The top cover assembly according to claim 2, characterized in that, The upper plastic has a baffle wall at the position corresponding to the connecting block, and the baffle wall is arranged around the outside of the connecting block along the circumference of the connecting block.

4. The top cover assembly according to claim 2, characterized in that, The upper plastic also includes: a first positioning post; The first positioning post protrudes from the upper plastic on the side facing the connecting block and is located beside the third through hole. The connecting block is provided with a first positioning hole, and the first positioning post is inserted into the first positioning hole.

5. The top cover assembly according to claim 4, characterized in that, The upper plastic also includes: a second positioning post; The second positioning post protrudes from the side of the upper plastic facing the top cover body and is located beside the third through hole and is staggered with the first positioning post. The top cover body is provided with a second positioning hole, and the second positioning post is inserted into the second positioning hole.

6. The top cover assembly according to claim 3, characterized in that, The thickness of the upper plastic in the baffle area and the thickness of the baffle are both T, satisfying: 1.0mm≤T≤2.0mm; The wall thickness of the upper plastic in the area not covered by the baffle is t, which satisfies: 0.2mm≤t≤0.5mm.

7. The top cover assembly according to claim 1, characterized in that, Along the height direction of the top cover body, the side of the cover body opposite to the tab is lower than the top surface of the receiving platform to form a recessed cavity for accommodating the thermally conductive adhesive layer.

8. The top cover assembly according to claim 7, characterized in that, Along the height direction of the top cover body, the depth of the recessed cavity is h, which satisfies: 0.3mm≤h≤0.8mm.

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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