Cover assembly and cell including same

Abstract

To provide a cover assembly and a single cell including the cover assembly, capable of decreasing a height of an internal structure of a battery core and a volume occupied by the height, thereby improving utilization of a vertical space.SOLUTION: A cover assembly 1 includes a cover body 20 and an electrode draw-out member 10. The cover body has a cover through hole 21. The electrode draw-out member includes a through portion 11 at least partially passes through the cover through hole and a connection plate 12 located on one side of the cover body facing an electrode assembly. The connection plate includes a first connection portion, a transitional connection portion, and a second connection portion, connected in sequence. The first connection portion is connected to the through portion, and along a direction in which the electrode assembly is close to the cover body, one side of at least part of the second connection portion facing the electrode assembly is higher than one side of the first connection portion facing the electrode assembly, thereby forming an accommodation cavity for accommodating a tab.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the field of batteries, and in particular to a cover assembly and a cell including the same. [Background technology]

[0002] In existing technology, the electrode assembly and pole of a prismatic battery are typically electrically connected via an adapter. Tabs are installed on the electrode assembly. The adapter includes a pole connection region and a tab connection region. The tab connection region is electrically connected to the tab, and the entire assembly is electrically connected to the pole via the pole connection region to complete the assembly.

[0003] In the prior art, there is a method of using a pole without an adapter. A bottom plate is formed on the underside of the pole. The pole extends outward from a cover through-hole in the cover body and is electrically connected to an external connection end. The bottom plate is located on one side of the cover body close to the electrode assembly, and the bottom plate is electrically connected to a tab drawn out from the electrode assembly.

[0004] The bottom plate and the tab are assembled and fixed by welding, so the folded tab will occupy a certain amount of vertical space, which will affect the overall height within the battery core and waste vertical space in the battery core. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to overcome the technical problem that in the existing technology, the tabs need to occupy a certain amount of vertical space, which affects the overall height of the battery core and results in wasted volume space of the battery core. The present invention provides a cover assembly and a battery cell including the same as a technical solution. [Means for solving the problem]

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The cover assembly is characterized by including:

[0008] a cover body having a cover through-hole;

[0009] an electrode lead member including a through-hole and a connection plate connected to each other, the through-hole at least partially passing through the cover through-hole, and the connection plate being located on one side of the cover body facing the electrode assembly;

[0010] a connection plate including a first connection portion, a transition connection portion, and a second connection portion connected in sequence, the first connection portion being connected to the penetration portion, and at least a portion of the second connection portion being arranged to be electrically connected to a tab drawn out from the electrode assembly;

[0011] Along the direction in which the electrode assembly approaches the cover body, one side of at least a part of the second connection portion facing the electrode assembly is higher than one side of the first connection portion facing the electrode assembly, thereby forming an accommodating cavity for accommodating the tab.

[0012] In this technical solution, along the direction in which the electrode assembly approaches the cover body, one side of at least a part of the second connection part facing the electrode assembly is made higher than one side of the first connection part facing the electrode assembly, thereby forming an accommodation cavity for accommodating the tab and reducing part or all of the height occupied by the tab in the longitudinal direction, thereby reducing the height of the internal structure of the battery core and the volume occupied by that height, achieving the advantageous technical effect of improving the vertical space utilization rate.

[0013] Preferably, one side of the second connection portion facing the electrode assembly is recessed in a direction closer to the cover body than one side of the first connection portion facing the electrode assembly, to form an accommodating cavity.

[0014] In this technical solution, the present invention specifically provides a method for forming an accommodating cavity for accommodating a tab pulled out from the electrode assembly by arranging one side of the second connection part of the connection plate facing the electrode assembly to be recessed in a direction closer to the cover body than the one side of the first connection part facing the electrode assembly.

[0015] Preferably, a part of the second connecting portion is bent toward the cover body to form the receiving cavity.

[0016] A portion of the transitional connection is bent toward the cover body to form a receiving cavity.

[0017] Preferably, when a portion of the transition connection portion is bent toward the cover body, the minimum cross-sectional area of ​​the transition connection portion is larger than the cross-sectional area of ​​the second connection portion.

[0018] In this technical solution, by defining the minimum cross-sectional area of ​​the transition connection part to be larger than that of the second connection part, i.e., the cross-sectional area of ​​any part of the transition connection part, including the curved region forming the receiving cavity, is larger than that of the second connection part, the current-carrying area of ​​the curved region forming the receiving cavity in the transition connection part can be prevented from becoming the minimum area, thereby ensuring the current-carrying ability of the curved region, and thus not affecting the normal operation of the current path between the second connection part and the first connection part.

[0019] Preferably, a curved portion is formed in the curved region, and the curved portion includes a first curved portion and a second curved portion that are curved in different directions and connected to each other.

[0020] Both the first curved portion and the second curved portion are curved obliquely, and / or the curved positions of the first curved portion and the second curved portion are formed into rounded corners.

[0021] In this technical solution, the curved section has a first curved section and a second curved section that are curved in different directions and connected to form a Z-shaped curved structure. This minimizes the amount of three-dimensional space required to form the receiving cavity, making the overall structure more compact. By bending the first and second curved sections at an angle, the connection reliability and mechanical properties of the curved sections can be better ensured than by bending them at right angles, which are prone to stress concentration. By rounding the curved positions of the first and second curved sections, the risk of breakage during metal stamping can be reduced, and the arc-shaped transition formed by the rounded corners helps improve the connection strength of the components. This reduces the risk of connection failure of the connecting plate under extreme conditions such as vibration and impact, significantly improving structural reliability.

[0022] Preferably, the second connecting portion and the transition connecting portion have the same thickness, and the thickness of at least a portion of the curved portion is less than the thickness of the second connecting portion.

[0023] In this technical solution, the strength of the entire connecting plate is ensured by setting the thickness of the second connecting portion and the intermediate connecting portion to be the same.

[0024] Preferably, an extension portion is provided at one end of the through-hole on the connecting plate side, protruding from the surface of the through-hole in the radial direction of the through-hole, and the extension portion is positioned so as to press-fit the sealing member between the extension portion and the cover body.

[0025] Along the direction in which the electrode assembly approaches the cover body, one side of the second connecting portion facing the cover body is lower than or equal to one side of the sealing member facing the cover body, or one side of the second connecting portion facing the cover body is lower than or equal to one side of the extension portion facing the cover body.

[0026] In this technical solution, by providing an extension portion on the electrode lead member that presses the sealing member, a press-fit force can be applied to the sealing member, which improves compression of the sealing member and ensures the sealing performance and insulation reliability of the electrode lead member. By arranging one side of the second connection portion facing the cover body lower or equal to one side of the sealing member facing the cover body, the extension portion can compress the sealing member, thereby ensuring that the sealing function is fulfilled. By arranging one side of the second connection portion facing the cover body lower or equal to one side of the extension portion facing the cover body, it is possible to prevent the height of the extension portion from being too low, reaching the height at which the sealing member is pressed in and thereby failing to achieve a sealing effect.

[0027] Preferably, the through portion and the extension portion are integrally formed, and / or

[0028] The extension portion is integrally formed with the first connecting portion, or the extension portion is connected to the first connecting portion by welding.

[0029] In this technical solution, the penetration portion and the extension portion are integrally formed, thereby improving the connection strength between the penetration portion and the extension portion. By integrally forming the extension portion and the first connection portion, the connection area between the penetration portion and the connection plate is increased and widened, improving the connection strength between the components. The extension portion is connected to the first connection portion by welding, so the penetration portion is also connected to the first connection portion by welding. By positioning the extension portion above the penetration portion, the restoring force of the sealing member acts first on the extension portion, preventing the restoring force of the sealing member from being applied to the welded portion and improving the connection reliability between the connection plate and the penetration portion.

[0030] Preferably, the extension portion is arranged coaxially with the through portion, the first arc segment is arranged on one side of the extension portion away from the second connection portion, and a second arc segment having the same curvature as the first arc segment is installed at the first connection portion at a position corresponding to the first arc segment of the extension portion.

[0031] An end of the transitional connection portion proximate the first connection portion extends tangent to the end of the second arc segment.

[0032] In this technical solution, a first arc segment is disposed on one side of the extension portion remote from the second connection portion, and a second arc segment is disposed at a position corresponding to the first arc segment of the extension portion at the first connection portion, and the curvature of the second arc segment is identical to that of the first arc segment, i.e., the shape and dimensions of the second arc segment are completely identical to those of the first arc segment, and the shapes and dimensions of the one side of the extension portion remote from the first connection portion and the second connection portion are completely identical to each other, ensuring the most effective connection between the first connection portion and the extension portion while reducing the total weight of the connection plate as much as possible. Furthermore, by extending one end of the transition connection portion close to the first connection portion in a tangential direction to the end of the second arc segment, the total weight of the connection plate can be further reduced.

[0033] Preferably, one side of the first connection portion facing the cover body and one side of the second connection portion facing the cover body are located on the same plane, the thickness of the second connection portion is thinner than the thickness of the first connection portion, and the area with the difference in thickness between the second connection portion and the first connection portion forms an accommodating cavity.

[0034] The present technical solution provides a specific method for forming the accommodating cavity by forming a region with a thickness difference between the second connecting portion and the first connecting portion, i.e., by reducing the thickness of the second connecting portion to form the accommodating cavity. By positioning one side of the first connecting portion facing the cover body and one side of the second connecting portion facing the cover body on the same plane, the space utilization rate of the battery core is further improved.

[0035] Preferably, one side of the first connection portion facing the cover body, one side of the second connection portion facing the cover body, and one side of the transition connection portion facing the cover body are located on the same plane, and the thickness of the second connection portion is less than the thickness of the transition connection portion, and the thickness of the transition connection portion is less than or equal to the thickness of the first connection portion.

[0036] In this technical solution, by setting the thickness of the transition connection part equal to the thickness of the first connection part, the technical effect of maintaining and improving structural strength is achieved. By setting the thickness of the transition connection part less than the thickness of the first connection part, the advantageous technical effects of reducing the weight of the entire structure and improving energy density can be further achieved. By locating one side of the first connection part facing the cover body, one side of the second connection part facing the cover body, and one side of the transition connection part facing the cover body on the same plane, the space utilization rate of the battery core is further improved.

[0037] Preferably, a groove is disposed on one side of the second connecting portion facing the electrode assembly, the groove forming a receiving cavity.

[0038] In this technical solution, the groove is specifically arranged on one side of the second connection part facing the electrode assembly, i.e., a portion of the one side of the second connection part facing the electrode assembly is recessed in a direction approaching the cover body, thereby forming an accommodating cavity.

[0039] Preferably, the second connecting portion has a protrusion at a position corresponding to the groove on one side facing the cover body.

[0040] One side of the second connecting portion facing the cover body and one side of the transition connecting portion facing the cover body are located on the same plane.

[0041] In this technical solution, the second connection part has a protrusion at a position corresponding to one of the grooves facing the cover body, thereby ensuring the thickness of the bottom wall at the position of the groove and thereby ensuring the connection strength of the second connection part. By locating the one side of the second connection part facing the cover body and the one side of the first connection part facing the cover body on the same plane, the space utilization rate of the battery core is further improved.

[0042] The number of the second connection portions is plural, and at least one of the second connection portions is provided with an accommodating cavity; and / or

[0043] The second connection portion includes a plurality of second connection sections connected in sequence, and at least one of the plurality of second connection sections has an accommodating cavity disposed therein.

[0044] In this technical solution, by providing an accommodating cavity in at least one of the plurality of second connection portions, it is possible to reduce a portion of the height occupied by the tab in the longitudinal direction, thereby reducing the height of the internal structure of the battery core and the volume occupied by that height, and achieving the advantageous technical effect of improving the utilization of vertical space. By providing an accommodating cavity in at least one of the plurality of continuously connected second connection portions, it is possible to reduce a portion of the height occupied by the tab in the longitudinal direction, thereby reducing the height of the internal structure of the battery core and the volume occupied by that height, and achieving the advantageous technical effect of improving the utilization of vertical space.

[0045] The height of the receiving cavity is not less than 0.3 times the thickness of the tab and is not more than the thickness of the tab.

[0046] In this technical solution, by setting the relationship between the height of the accommodating cavity and the thickness of the tab, at least a portion of the height occupied by the tab can be accommodated in the accommodating cavity, thereby further improving the space utilization rate of the battery core.

[0047] The cell is characterized in that it includes:

[0048] Housing and

[0049] the aforementioned cover assembly disposed over the housing and defining a receiving cavity together with the housing;

[0050] A battery core housed within the housing cavity and to which the electrode assembly is connected.

[0051] In this technical solution, along the direction in which the electrode assembly approaches the cover body, one side of at least a part of the second connection portion of the connection plate facing the electrode assembly is made higher than one side of the first connection portion facing the electrode assembly, thereby forming an accommodation cavity for accommodating the tab and reducing part or all of the height occupied by the tab in the longitudinal direction, thereby achieving the advantageous technical effect of reducing the height of the internal structure of the battery core and the volume occupied by that height, and improving the vertical space utilization rate. [Effects of the Invention]

[0052] The advantageous effects of the present invention are as follows:

[0053] In the present invention, along the direction in which the electrode assembly approaches the cover body, one side of at least a part of the second connection portion of the connection plate facing the electrode assembly is made higher than one side of the first connection portion facing the electrode assembly, thereby forming an accommodation cavity for accommodating the tab and reducing part or all of the height occupied by the tab in the longitudinal direction, thereby achieving the advantageous technical effect of reducing the height of the internal structure of the battery core and the volume occupied by that height, and improving the vertical space utilization rate. [Brief explanation of the drawings]

[0054] [Figure 1] 1 is an exploded view of a cover assembly according to a first embodiment of the present invention; [Figure 2] 1 is a three-dimensional structural view of a cover assembly according to a first embodiment of the present invention. [Figure 3] 1 is a three-dimensional structural view of a cover assembly according to a first embodiment of the present invention. [Figure 4] 1 is a cross-sectional structural view of a cover assembly according to a first embodiment of the present invention. [Figure 5] 3 is a three-dimensional structural view of an electrode lead member of the cover assembly according to the first embodiment of the present invention. FIG. [Figure 6] 3 is a schematic bottom view of the connection plate of the electrode lead member of the cover assembly according to the first embodiment of the present invention. FIG. [Figure 7] 10 is a three-dimensional structural view of an electrode lead member of a cover assembly according to another embodiment of the first embodiment of the present invention. FIG. [Figure 8] FIG. 10 is a three-dimensional structural view of an electrode lead member of a cover assembly according to a second embodiment of the present invention. [Figure 9] FIG. 10 is a three-dimensional structural view of the electrode lead member of the cover assembly according to the second embodiment of the present invention, viewed from another angle. [Figure 10] FIG. 10 is a three-dimensional structural view of an electrode lead member of a cover assembly according to another embodiment of the second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0055] Preferred embodiments and a clearer and more complete description of the present invention are provided below in conjunction with the accompanying drawings.

[0056] Embodiment 1

[0057] 1 to 6, this embodiment provides a cover assembly 1 and a cell including the same. The cell includes a housing, the cover assembly 1, and a cell core.

[0058] The cover assembly 1 is disposed over the housing and defines a housing cavity together with the housing, the battery core being housed in the housing cavity, and the electrode assembly being connected to the battery core.

[0059] The cover assembly 1 includes a cover body 20 and an electrode lead member 10. The cover body 20 has a cover through-hole 21.

[0060] One end of the electrode lead-out member 10 is electrically connected to a tab drawn out from the electrode assembly, and the other end at least partially passes through the cover through-hole 21. Specifically, the electrode lead-out member 10 includes a through-hole 11 and a connecting plate 12 that are connected to each other. The through-hole 11 at least partially passes through the cover through-hole 21. The connecting plate 12 is located on one side of the cover body 20 that faces the electrode assembly.

[0061] The connecting plate 12 includes a first connecting portion 121, a transition connecting portion 122, and a second connecting portion 123, which are connected in sequence. The first connecting portion 121 is connected to the through-hole 11, and at least a portion of the second connecting portion 123 is arranged to be electrically connected to a tab drawn out from the electrode assembly. Along the direction F in which the electrode assembly approaches the cover body 20, one side of at least a portion of the second connecting portion 123 facing the electrode assembly is higher than one side of the first connecting portion 121 facing the electrode assembly, thereby forming an accommodating cavity 30 that accommodates the tab.

[0062] In this way, along the direction F in which the electrode assembly approaches the cover body 20, one side of at least a part of the second connection portion 123 facing the electrode assembly is made higher than one side of the first connection portion 121 facing the electrode assembly, thereby forming an accommodation cavity 30 for accommodating the tab and reducing part or all of the height occupied by the tab in the longitudinal direction, thereby achieving the advantageous technical effect of reducing the height of the internal structure of the battery core and the volume occupied by that height, and improving the vertical space utilization rate.

[0063] Furthermore, one side of the second connection portion 123 facing the electrode assembly is recessed in a direction closer to the cover body 20 than one side of the first connection portion 121 facing the electrode assembly, thereby forming an accommodating cavity 30 for accommodating the tab. That is, by arranging one side of the entire second connection portion 123 (including the area connected to the tab and other areas) facing the electrode assembly to be higher than one side of the first connection portion 121 facing the electrode assembly, a specific forming method is provided in which the accommodating cavity 30 for accommodating the tab pulled out from the electrode assembly is formed.

[0064] The side of the connection plate 12 facing the cover body 20 and the side facing the electrode assembly are two opposing sides along the axial direction P of the through-hole 11.

[0065] In this embodiment, a portion of the transition connecting portion 122 is bent toward the cover body 20 to form the accommodating cavity 30, but the present invention is not limited to this. In other embodiments, a portion of the second connecting portion 123 may be bent toward the cover body 20 to form the accommodating cavity 30.

[0066] In this embodiment, the minimum cross-sectional area of ​​the transition connection portion 122 is larger than the cross-sectional area of ​​the second connection portion 123. That is, the cross-sectional area of ​​any part of the transition connection portion 122, including the curved region that forms the accommodating cavity 30, is larger than the cross-sectional area of ​​the second connection portion 123, so that the current-carrying area of ​​the curved region that forms the accommodating cavity 30 in the transition connection portion 122 does not become the minimum area, thereby ensuring the current-carrying ability of the curved region. In this way, the normal operation of the current path between the second connection portion 123 and the first connection portion 121 is not affected.

[0067] A curved portion 124 is formed in the curved region, and the curved portion 124 includes a first curved portion 1241 and a second curved portion 1242 that are curved in different directions and connected together, forming a Z-shaped curved structure, which can save as much three-dimensional space as possible to form the accommodating cavity 30, making the entire structure more compact.

[0068] As described above, the minimum cross-sectional area of ​​the transition connection portion 122 is larger than the cross-sectional area of ​​the second connection portion 123, and therefore the minimum cross-sectional area of ​​the curved portion 124 is also larger than the cross-sectional area of ​​the second connection portion 123. This ensures the current-carrying capacity of the curved portion 124 without affecting the normal operation of the current path between the second connection portion 123 and the first connection portion 121.

[0069] Preferably, both the first curved portion 1241 and the second curved portion 1242 are bent at an angle. By bending both the first curved portion 1241 and the second curved portion 1242 at an angle in this way, rather than bending them at a right angle, which is likely to cause stress concentration, connection reliability and good mechanical properties can be more preferably ensured at the curved portions.

[0070] Specifically, the oblique bending angle of the first curved portion 1241 and the second curved portion 1242 is 15 degrees to 75 degrees.

[0071] The first curved portion 1241 and the second curved portion 1242 are both curved at rounded corners, which reduces the risk of breakage during metal punching and helps improve the connection strength of the components formed by the rounded corners. In this way, the risk of connection failure of the connecting plate 12 under extreme usage conditions such as vibration and impact is reduced, and structural reliability is greatly improved.

[0072] Preferably, the second connecting portion 123 and the intermediate connecting portion 122 are set to have the same thickness, thereby ensuring the strength of the entire connecting plate 12. Note that, because the second connecting portion 123 and the transition connecting portion 122 have the same thickness, the second connecting portion 123 as a whole is raised via the curved portion 124. Therefore, the second connecting portion 123 and the side of the non-curved region of the transition connecting portion 122 facing the cover body 20 are not located on the same plane. The distance from the side of the second connecting portion 123 facing the cover body 20 to the cover body 20 is less than the distance from the side of the non-curved region of the transition connecting portion 122 facing the cover body 20 to the cover body 20.

[0073] The curved portion 124 may be formed by punching the connecting plate 12. The thickness at the punched position may be the same as or different from the thickness of the adjacent region, and the thickness may be set as needed. In this embodiment, at least a portion of the thickness of the curved portion 124 is less than the thickness of the second connecting portion 123.

[0074] As shown in FIG. 7 , in another embodiment of this embodiment, one side of the first connection portion 121 facing the cover body 20 and one side of the second connection portion 123 facing the cover body 20 are located on the same plane. The thickness H2 of the second connection portion 123 is less than the thickness H1 of the first connection portion 121, and the region where there is a difference in thickness between the second connection portion 123 and the first connection portion 121 forms the accommodating cavity 30. In this manner, the region where there is a difference in thickness between the second connection portion 123 and the first connection portion 121 forms the accommodating cavity 30. In other words, a specific method for forming the accommodating cavity 30 is provided, in which the thickness of the second connection portion 123 is reduced. By locating the one side of the first connection portion 121 facing the cover body 20 and the one side of the second connection portion 123 facing the cover body 20 on the same plane, the space utilization rate of the battery core is further improved.

[0075] Furthermore, one side of the first connecting portion 121 facing the cover body 20, one side of the second connecting portion 123 facing the cover body 20, and one side of the transition connecting portion 122 facing the cover body 20 are located on the same plane, and the thickness of the second connecting portion 123 is less than the thickness of the transition connecting portion 122, and the thickness of the transition connecting portion 122 is equal to the thickness of the first connecting portion 121. By making the thickness of the transition connecting portion 122 equal to the thickness of the first connecting portion 121, advantageous technical effects such as improved structural strength and improved energy density can be achieved. By locating the one side of the first connecting portion 121 facing the cover body 20, one side of the second connecting portion 123 facing the cover body 20, and one side of the transition connecting portion 122 facing the cover body 20 on the same plane, the space utilization rate of the battery core is further improved.

[0076] However, the present invention is not limited thereto. In other embodiments, the thickness of the transition connection portion 122 can be set smaller than the thickness of the first connection portion 121 to further achieve the advantageous technical effect of reducing the total weight of the structure.

[0077] In this embodiment, the height h of the receiving cavity 30 is greater than or equal to 0.3 times the thickness of the tab and less than or equal to the thickness of the tab. By setting the relationship between the height h of the receiving cavity 30 and the thickness of the tab in this manner, at least a portion of the height occupied by the tab can be accommodated within the receiving cavity 30, thereby further improving the space utilization rate of the battery core. Preferably, the height h of the receiving cavity 30 is equal to the thickness of the tab, thereby achieving the advantageous technical effect of completely accommodating the tab within the receiving cavity 30.

[0078] In this embodiment, the number of second connection portions 123 is two, and both second connection portions 123 are provided with an accommodating cavity 30, but the present invention is not limited thereto. In other embodiments, the number of second connection portions 123 may be three, four, or five, and at least one of the plurality of second connection portions 123 is provided with an accommodating cavity 30 to reduce part or all of the height of the tab in the longitudinal direction, thereby achieving the advantageous technical effect of reducing the height of the internal structure of the battery core and the volume occupied by that height, and improving the vertical space utilization rate. In other embodiments, the second connection portion 123 includes a plurality of second connection sections connected in series, and at least one of the plurality of second connection sections is provided with an accommodating cavity 30 to reduce part or all of the height of the tab in the longitudinal direction, thereby achieving the advantageous technical effect of reducing the height of the internal structure of the battery core and the volume occupied by that height, and improving the vertical space utilization rate.

[0079] The two second connecting portions 123, the transition connecting portion 122, and the first connecting portion 121 form a V-shaped structure as a whole. By forming the two second connecting portions 123, the transition connecting portion 122, and the first connecting portion 121 into a V-shaped structure as a whole in this way, excess waste can be significantly reduced, and the total weight of the structural member can be reduced.

[0080] In this embodiment, the through-hole 11 and the connecting plate 12 have a composite separate structure, and are formed from the same material. By forming the through-hole 11 and the connecting plate 12 as such a composite separate structure, the through-hole 11 and the connecting plate 12 can be processed separately and then integrated, thereby achieving the advantageous technical effect of significantly saving material and thereby saving costs. Forming the through-hole 11 and the connecting plate 12 from the same material makes it easier to assemble them and improves the connection strength between them.

[0081] However, the present invention is not limited to this. In other embodiments, the through-holes 11 and the connecting plate 12 may be integrally formed. By providing the through-holes 11 and the connecting plate 12 integrally in this way, the connection strength between the through-holes 11 and the connecting plate 12 is improved.

[0082] In this embodiment, the cover assembly 1 further includes an insulating member 40 that covers one side of the cover body 20 facing the electrode assembly and is positioned between the cover body 20 and the connecting plate 12. The insulating member 40 is made of plastic, but is not limited to this material and may be made of other insulating materials. The insulating member 40 has an insulating member through-hole 41 formed at a position corresponding to the cover through-hole 21, and the through-portion 11 of the electrode lead member 10 passes through the cover through-hole 21 and the insulating member through-hole 41 in that order. The diameter of the insulating member through-hole 41 is larger than the diameter of the cover through-hole 21. A sealing member 50 is disposed on one side of the cover through-hole 21 facing the electrode assembly. The sealing member 50 is interposed between the electrode lead member 10 and the cover body 20 and is positioned within the insulating member through-hole 41.

[0083] At one end of the through-hole 11 on the connecting plate 12 side, an extension portion 111 is provided that protrudes from the surface of the through-hole 11 in the radial direction of the through-hole 11, and the extension portion 111 is positioned so as to press-fit the sealing member 50 between the extension portion 111 and the cover main body 20.

[0084] Along the direction F in which the electrode assembly approaches the cover body 20, one side of the second connection portion 123 facing the cover body 20 is lower than or equal to one side of the sealing member 50 facing the cover body 20. In this way, by providing the extension portion 111 that presses the sealing member 50 into the electrode lead member 10, a press-fit force can be applied to the sealing member 50, which improves compression of the sealing member 50 and ensures the sealing performance and insulation reliability of the electrode lead member 10.

[0085] However, the present invention is not limited to this. In other embodiments, the side of the second connecting portion 123 facing the cover body 20 may be lower than or equal to the side of the extending portion 111 facing the cover body 20. By making the side of the second connecting portion 123 facing the cover body 20 lower than or equal to the side of the extending portion 111 facing the cover body 20, it is possible to prevent the height of the extending portion 111 from becoming too low and reaching the height at which the sealing member 50 is press-fitted, thereby preventing the sealing effect from being lost.

[0086] In this embodiment, the through portion 11 and the extending portion 111 are integrally formed, which improves the connection strength between the through portion 11 and the extending portion 111. The extending portion 111 is connected to the first connecting portion 121 by welding. That is, the through portion 11 is also connected to the first connecting portion 121 by welding. By positioning the extending portion 111 above the through portion 11, the restoring force of the sealing member 50 first acts on the extending portion 111, which prevents the restoring force of the sealing member 50 from being applied to the welded portion and improves the connection reliability between the connecting plate 12 and the through portion 11.

[0087] However, the present invention is not limited to this. In another embodiment, the extension portion 111 and the first connection portion 121 are integrally formed, thereby increasing and widening the connection area between the through portion 11 and the connection plate 12, and improving the connection strength between the members.

[0088] In this embodiment, the extension portion 111 is arranged coaxially with the through portion 11, the first arc segment 1111 is arranged on one side of the extension portion away from the second connecting portion 123, and a second arc segment 1211 having the same curvature as the first arc segment 1111 is installed at the first connecting portion 123 at a position corresponding to the first arc segment 1111 of the extension portion 111. One end of the transition connecting portion 122 close to the first connecting portion 121 extends along the tangent direction of the end of the second arc segment 1211.

[0089] In this way, by positioning the first arc segment 1111 on one side of the extension portion 111 away from the second connection portion 123, a second arc segment 1211 is installed on the first connection portion 121 at a position corresponding to the first arc segment 1111 of the extension portion 111, so that the second arc segment 1211 has the same curvature as the first arc segment 1111, i.e., the shape and dimensions of the second arc segment 1211 are completely consistent with those of the first arc segment 1111, and the shapes and dimensions of the first connection portion 121 and the one side of the extension portion 111 away from the second connection portion 123 are completely consistent with each other, thereby ensuring the most effective connection between the first connection portion 121 and the extension portion 111 while reducing the total weight of the connection plate 12 as much as possible. Furthermore, by extending one end of the transition connecting portion 122 close to the first connecting portion 121 in a tangential direction to the end of the second arc segment 1211, the total weight of the connecting plate 12 is further reduced.

[0090] An outwardly protruding position restricting portion 42 is provided on one side of the insulating member 40 facing the electrode assembly, and at least a portion of the contour of the connecting plate 12 is engaged with the position restricting portion 42. By providing the insulating member 40 with the position restricting portion 42 that can engage with at least a portion of the contour of the connecting plate 12 in this way, on the one hand, the connecting plate 12 can be conveniently positioned by cooperation between the position restricting portion 42 and the connecting plate 12 when assembling the electrode lead member 10. On the other hand, an advantageous technical effect of preventing rattling of the connecting plate 12 is obtained.

[0091] The number of electrode lead members 10 is two. The numbers of cover through-holes 21, sealing members 50 and insulating member through-holes 41 correspond to the number of electrode lead members 10, which is two.

[0092] In this embodiment, along the direction F in which the electrode assembly approaches the cover body 20, one side of at least a part of the second connection portion 123 facing the electrode assembly is made higher than one side of the first connection portion 121 facing the electrode assembly, thereby forming an accommodation cavity 30 to accommodate the tab and reducing part or all of the height occupied by the tab in the longitudinal direction, thereby achieving the advantageous technical effect of reducing the height of the internal structure of the battery core and the volume occupied by that height, and improving the utilization rate of the vertical space.

[0093] Embodiment 2

[0094] As shown in FIGS. 6 to 9 , the overall structure of the cover assembly 1 and the cell including the same in this embodiment is substantially the same as that in Embodiment 1. The difference between Embodiment 1 and Embodiment 2 lies in the arrangement of the accommodating cavity 30. Specifically, a groove 125 is provided on one side of the second connecting portion 123 facing the electrode assembly, and the groove 125 forms the accommodating cavity 30. By providing the groove 125 on the one side of the second connecting portion 123 facing the electrode assembly, that is, by recessing a portion of the structure of the one side of the second connecting portion 123 facing the electrode assembly in a direction approaching the cover body 20, that is, by setting the one side of the second connecting portion 123 (the region connected to the tab) facing the electrode assembly higher than the one side of the first connecting portion 121 facing the electrode assembly, a specific realization of forming the accommodating cavity 30 is provided.

[0095] On one side of the second connection part 123 facing the cover body 20, a protrusion 126 corresponding to the position of the groove 125 is installed to ensure the thickness of the bottom wall at the position of the groove 125, thereby ensuring the connection strength of the second connection part 123.

[0096] However, the present invention is not limited thereto. As shown in Fig. 10, in another implementation of this embodiment, one side of the second connection portion 123 facing the cover body 20 and one side of the transition connection portion 122 facing the cover body 20 are located on the same plane to further improve the space utilization of the battery core. Furthermore, one side of the first connection portion 121 facing the cover body 30, one side of the second connection portion 123 facing the cover body 20, and one side of the transition connection portion 122 facing the cover body 20 are located on the same plane.

[0097] Although specific embodiments of the present invention have been described above, those skilled in the art will understand that these are merely examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, and all of these changes and modifications will fall within the protection scope of the present invention. [Industrial Applicability]

[0098] The present invention provides a cover assembly and cell that makes high utilization of vertical space. [Explanation of symbols]

[0099] 1: Cover assembly 10: Electrode lead member 11: Penetration 111: Extension part 1111: First arc segment 12: Connection board 121: First connection part 1211: Second arc segment 122: Transitional joint 123: Second connection 124: Curved section 1241: First curved section 1242: Second curve 125: Groove 126: Protrusion 20: Cover body 21: Cover through hole 30: Containment cavity 40: Insulating material 41: Insulation member through hole 42: Position regulation part 50: Sealing member h height H1: Thickness H2: Thickness

Claims

1. A cover assembly suitable for a cell, comprising: a cover body having a cover through-hole; an electrode lead member including a through-hole and a connection plate connected to each other, the through-hole at least partially passing through the cover through-hole, and the connection plate being located on one side of the cover body facing the electrode assembly; a connection plate including a first connection portion, a transition connection portion, and a second connection portion connected in sequence, the first connection portion being connected to the penetration portion, and at least a portion of the second connection portion being arranged to be electrically connected to a tab drawn out from the electrode assembly; a side of the at least part of the second connecting portion facing the electrode assembly along a direction in which the electrode assembly approaches the cover body is higher than a side of the first connecting portion facing the electrode assembly, thereby forming an accommodating cavity for accommodating the tab; A cover assembly, wherein the number of the second connecting portions is two, and the receiving cavities are provided in both of the second connecting portions.

2. 2. The cover assembly according to claim 1, wherein one side of the second connection portion facing the electrode assembly is recessed in a direction closer to the cover body than one side of the first connection portion facing the electrode assembly, thereby forming the accommodating cavity.

3. A part of the second connection portion is bent toward the cover body to form the accommodating cavity, or The cover assembly of claim 2 , wherein a portion of the transition connection is bent toward the cover body to form the receiving cavity.

4. The cover assembly of claim 3 , wherein when the portion of the transition connection is bent toward the cover body, a minimum current-carrying area of ​​the transition connection is greater than a current-carrying area of ​​the second connection.

5. A curved portion is formed in the curved region, the curved region is disposed between the second connection portion and the transition connection portion, and the curved portion includes a first curved portion and a second curved portion that are curved in different directions and connected to each other, 5. The cover assembly according to claim 3, wherein both the first curved portion and the second curved portion are beveled or formed with rounded corners.

6. The cover assembly of claim 5 , wherein the second connection portion and the transition connection portion have the same thickness, and the thickness of at least a portion of the curved portion is less than the thickness of the second connection portion.

7. an extension portion is provided at one end of the through-hole on the connecting plate side, the extension portion protruding from a surface of the through-hole along a radial direction of the through-hole, and the extension portion is arranged so as to press-fit a sealing member between the extension portion and the cover body; 2. The cover assembly of claim 1, wherein, along a direction in which the electrode assembly approaches the cover body, one side of the second connection portion facing the cover body is lower than or equal to one side of the sealing member facing the cover body, or the one side of the second connection portion facing the cover body is lower than or equal to one side of the extension portion facing the cover body.

8. The through portion and the extending portion are integrally formed, and / or The cover assembly according to claim 7 , wherein the extension portion is integrally formed with the first connecting portion, or the extension portion is connected to the first connecting portion by welding.

9. The extension portion is stacked vertically with the through-hole portion and arranged coaxially with the through-hole portion, a first arc segment is arranged on one side of the extension portion away from the second connection portion, and a second arc segment having the same curvature as the first arc segment is installed on the first connection portion at a position corresponding to the first arc segment of the extension portion, The cover assembly according to claim 7 , wherein an end of the transition connection portion proximate to the first connection portion extends along a tangent direction to an end of the second arc segment.

10. 2. The cover assembly of claim 1, wherein one side of the first connection portion facing the cover body and one side of the second connection portion facing the cover body are located on the same plane, the thickness of the second connection portion is less than the thickness of the first connection portion, and a region having a thickness difference between the second connection portion and the first connection portion forms the storage cavity.

11. The cover assembly of claim 10, wherein the one side of the first connection portion facing the cover body, the one side of the second connection portion facing the cover body, and the one side of the transition connection portion facing the cover body are located on the same plane, the thickness of the second connection portion is less than the thickness of the transition connection portion, and the thickness of the transition connection portion is less than or equal to the thickness of the first connection portion.

12. The cover assembly according to claim 1 , wherein a groove is disposed on one side of the second connection portion facing the electrode assembly, the groove forming the receiving cavity.

13. The cover assembly according to claim 12 , wherein the second connecting portion has a protrusion at a position corresponding to the groove on one side facing the cover body.

14. The cover assembly according to claim 12 , wherein one side of the second connection portion facing the cover body and one side of the transition connection portion facing the cover body are located on the same plane.

15. A cover assembly as described in claim 1, wherein the second connection portion includes a plurality of second connection compartments connected in sequence, and the accommodating cavity is installed in at least one of the plurality of second connection compartments.

16. Housing and a cover assembly according to claim 1 disposed over a housing and defining a receiving cavity therewith; a battery core accommodated in the accommodation cavity and to which the electrode assembly is connected.

17. 17. The cell of claim 16, wherein the height of the receiving cavity is not less than 0.3 times the thickness of the tab and not more than the thickness of the tab.

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