Top cover assembly, single battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a top cover assembly, a single battery cell and a battery pack. The top cover assembly comprises a cover plate and a terminal assembly. The cover plate comprises a main body part and a protruding part which are connected with each other. The terminal assembly is arranged on the protruding part. The protruding part faces the side, away from the electrode assembly, of the main body part, and the side, close to the electrode assembly, of the protruding part and the main body part have a height difference so that the gap between the terminal assembly and the electrode assembly can be prolonged. Wherein the height difference is H, and H is larger than or equal to 0.1 mm and smaller than or equal to 10 mm. Therefore, more height space is provided for bending of the tabs, and the tabs and the connecting pieces are convenient to install.

Description

Technical Field

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

[0002] In related technologies, the internal components of a single battery cell typically employ an interference fit from bottom to top to achieve a compact internal structure and high space utilization. However, this compact design results in a small gap between the top cover assembly and the electrode assembly, limiting the space available to accommodate the tabs. Furthermore, the tabs usually need to be bent and welded to a connecting piece, with both the bent tabs and the connecting piece positioned within the gap between the top cover assembly and the electrode assembly, which is detrimental to the assembly of the single battery cell. Utility Model Content

[0003] The present invention provides a top cover assembly, a single battery cell, and a battery pack. By protruding portions, the distance between the terminal assembly and the electrode assembly is extended, so that the interior of the housing has more height space to accommodate the tabs and connecting pieces, thereby at least partially solving the above-mentioned technical problems.

[0004] In a first aspect, embodiments of the present invention provide a top cover assembly applied to a single battery cell, the single battery cell including an electrode assembly, the top cover assembly including:

[0005] The cover plate includes an interconnected main body and a protrusion;

[0006] Terminal assembly is provided on the protrusion;

[0007] The protrusion is located on the side of the main body away from the electrode assembly, so that the protrusion and the main body form a height difference, which is used to extend the distance between the terminal assembly and the electrode assembly. The height difference is H, which satisfies: 0.1 mm ≤ H ≤ 10 mm.

[0008] In one embodiment, the terminal assembly includes a positive terminal and a negative terminal spaced apart;

[0009] Wherein, along the direction from the cover plate to the electrode assembly, the projection of the protrusion covers at least the entire area between the positive terminal and the negative terminal; or, the protrusion is spaced two at a time, with the positive terminal located on one of the protrusions and the negative terminal located on the other of the protrusions.

[0010] In one embodiment, the main body is arranged around the periphery of the protrusion, the length of the main body is m, and the length of the protrusion is n, satisfying: 0.5m≤n≤m-k1;

[0011] And / or, the width of the main body is p, and the width of the protrusion is q, satisfying: 0.5p≤q≤p-k2;

[0012] In this case, both k1 and k2 are greater than 0.

[0013] In one embodiment, the cover plate further includes:

[0014] A connecting portion connects the main body portion and the protrusion portion;

[0015] Wherein, along the direction from the cover plate to the electrode assembly, the connecting part is inclined toward the main body, and the inclination angle of the connecting part is α, which satisfies: 20°≤α≤70°.

[0016] In one embodiment, the cover plate includes:

[0017] The top cover includes a first main body portion, a first protrusion portion, and a first connecting portion connecting the first main body portion and the first protrusion portion, wherein the first protrusion portion protrudes in a direction away from the electrode assembly;

[0018] The first connecting portion includes a first side away from the electrode assembly and a second side close to the electrode assembly. The first side has a first arc surface close to the first main body and a second arc surface close to the first protrusion. The second side has a third arc surface close to the first main body and a fourth arc surface close to the first protrusion. The first arc surface and the third arc surface are both curved towards the electrode assembly, and the second arc surface and the fourth arc surface are both curved away from the electrode assembly. The radius corresponding to the first arc surface is R1, the radius corresponding to the second arc surface is R2, the radius corresponding to the third arc surface is R3, and the radius corresponding to the fourth arc surface is R4, satisfying: 0 < R1 ≤ 10 mm, 0 < R2 ≤ 6 mm, 0 < R3 ≤ 6 mm, and 0 < R4 ≤ 10 mm.

[0019] In one embodiment, the cover plate further includes:

[0020] An insulating sheet is connected to the top cover sheet on the side away from the electrode assembly. The insulating sheet includes a second main body, a second protrusion, and a second connecting portion connecting the second main body and the second protrusion. The second protrusion protrudes in a direction away from the electrode assembly.

[0021] The second main body abuts against the first main body, the second protrusion abuts against the first protrusion, and the second connecting part is spaced apart from the first connecting part.

[0022] In one embodiment, the second connecting portion includes a third side away from the top cover plate and a fourth side near the top cover plate. The third side has a fifth arc surface near the second main body and a sixth arc surface near the second protrusion. The fourth side has a seventh arc surface near the second main body and an eighth arc surface near the second protrusion. The fifth and seventh arc surfaces are both curved towards the top cover plate, and the sixth and eighth arc surfaces are both curved away from the top cover plate. The radius corresponding to the fifth arc surface is R5, the radius corresponding to the sixth arc surface is R6, the radius corresponding to the seventh arc surface is R7, and the radius corresponding to the eighth arc surface is R8, satisfying: 0 < R5 ≤ R7 ≤ 5 mm, 0 < R8 ≤ R6 ≤ 2 mm.

[0023] In one embodiment, the cover plate further includes:

[0024] The lower plastic is connected to the top cover sheet on the side near the electrode assembly. The lower plastic includes a third main body, a third protrusion, and a third connecting part connecting the third main body and the third protrusion. The third protrusion protrudes in a direction away from the electrode assembly.

[0025] The third main body abuts against the first main body, the third protrusion abuts against the first protrusion, and the third connecting part is spaced apart from the first connecting part.

[0026] In one embodiment, the third connecting portion includes a fifth side near the top cover plate and a sixth side away from the top cover plate. The fifth side has a ninth arc surface near the third main body and a tenth arc surface near the third protrusion. The sixth side has an eleventh arc surface near the third main body and a twelfth arc surface near the third protrusion. The ninth and eleventh arc surfaces are both curved away from the top cover plate, and the tenth and twelfth arc surfaces are both curved towards the top cover plate. The radius corresponding to the ninth arc surface is R9, the radius corresponding to the tenth arc surface is R10, the radius corresponding to the eleventh arc surface is R11, and the radius corresponding to the twelfth arc surface is R12, satisfying: 0 < R9 ≤ R11 ≤ 2 mm, 0 < R12 ≤ R10 ≤ 5 mm.

[0027] In one embodiment, the third main body portion has a groove with its opening facing the top cover plate, and a through hole is formed on the bottom surface of the groove, the through hole being configured to allow electrolyte splashed onto the lower plastic to flow into the housing.

[0028] In one embodiment, the groove has a first end near the third connecting portion, and the distance between the first end and the third connecting portion along a first direction is W, satisfying: W≥0.3 mm.

[0029] Secondly, embodiments of this utility model provide a single battery cell, including the top cover assembly as described above.

[0030] In one embodiment, the single battery cell further includes:

[0031] The housing, with the cover plate connected to the housing;

[0032] An electrode assembly is disposed within the housing, and the electrode assembly is connected to tabs;

[0033] A connecting piece is disposed within the housing, the connecting piece being located between the electrode assembly and the cover plate, and the connecting piece being electrically connected to the terminal assembly;

[0034] Wherein, the tab is bent and welded to the connecting piece, and along the direction from the cover plate to the electrode assembly, the projection of the protrusion at least covers the connecting piece and / or the tab.

[0035] In one embodiment, the connecting piece includes a positive electrode connecting piece and a negative electrode connecting piece;

[0036] Wherein, along the direction from the cover plate to the electrode assembly, the projection of the protrusion at least covers the entire area between the positive electrode connecting piece and the negative electrode connecting piece; or, the protrusion is spaced in two, and along the direction from the cover plate to the electrode assembly, the projection of one protrusion at least covers the positive electrode connecting piece, and the projection of the other protrusion at least covers the negative electrode connecting piece.

[0037] In one embodiment, the electrode tab includes a positive electrode tab and a negative electrode tab, the positive electrode tab is bent and then welded to the positive electrode connecting piece, and the negative electrode tab is bent and then welded to the negative electrode connecting piece;

[0038] Wherein, along the direction from the cover plate to the electrode assembly, the projection of the protrusion at least covers the entire area between the positive electrode tab and the negative electrode tab; or, the protrusion is spaced in two, and along the direction from the cover plate to the electrode assembly, the projection of one protrusion at least covers the positive electrode tab, and the projection of the other protrusion at least covers the negative electrode tab.

[0039] Thirdly, embodiments of this utility model provide a battery pack, including the single battery cell as described above.

[0040] The beneficial effects of the embodiments of this utility model are as follows:

[0041] In embodiments of this utility model, by forming a protrusion on the cover plate and creating a height difference of 0.1 mm to 10 mm between the protrusion and the main body on the side near the electrode assembly, the gap between the terminal assembly and the electrode assembly can be extended by 0.1 mm to 10 mm, thereby providing more height space for the tab bending and facilitating the installation of the tab, connecting piece, and other structures disposed between the terminal assembly and the electrode assembly. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this utility model;

[0044] Figure 2 This is a cross-sectional view of a single battery cell provided in an embodiment of this utility model;

[0045] Figure 3 This is one of the structural schematic diagrams of the cover plate provided in an embodiment of this utility model;

[0046] Figure 4 This is a top view of the cover plate provided in an embodiment of this utility model;

[0047] Figure 5 This is a second schematic diagram of the structure of the cover plate provided in an embodiment of this utility model;

[0048] Figure 6 This is a schematic diagram of the structure of the top cover sheet provided in an embodiment of this utility model;

[0049] Figure 7 This is a schematic diagram of the structure of the insulating sheet provided in an embodiment of this utility model;

[0050] Figure 8 This is a schematic diagram of the lower plastic structure provided in an embodiment of the present invention;

[0051] Figure 9 This is a partial cross-sectional view of the cover plate provided in an embodiment of this utility model;

[0052] Figure 10 This is one of the partial cross-sectional views of the top cover sheet provided in an embodiment of this utility model;

[0053] Figure 11 This is a second partial sectional view of the top cover plate provided in an embodiment of this utility model;

[0054] Figure 12 This is one of the partial cross-sectional views of the insulating sheet provided in the embodiments of this utility model;

[0055] Figure 13 This is a second partial cross-sectional view of the insulating sheet provided in an embodiment of this utility model;

[0056] Figure 14 This is one of the partial cross-sectional views of the lower plastic provided in the embodiments of this utility model;

[0057] Figure 15 This is a second partial cross-sectional view of the lower plastic provided in an embodiment of this utility model;

[0058] Figure 16 This is the third partial cross-sectional view of the lower plastic provided in the embodiment of this utility model.

[0059] Figure label:

[0060] 10-Cover plate, 110-Main body, 120-Protrusion, 130-Connecting part, 140-Top cover plate, 1410-First main body, 1420-First protrusion, 1430-First connecting part, 1440-First arc surface, 1450-Second arc surface, 1460-Third arc surface, 1470-Fourth arc surface, 150-Insulating sheet, 1510-Second main body, 1520-Second protrusion, 1530-Second connecting part, 1540-Fifth arc surface, 1550- Sixth arc surface, 1560-Seventh arc surface, 1570-Eighth arc surface, 160-Lower plastic, 1610-Third main body, 1620-Third protrusion, 1630-Third connecting part, 1640-Ninth arc surface, 1650-Tenth arc surface, 1660-Eleventh arc surface, 1670-Twelfth arc surface, 1680-Groove, 1690-Through hole, 170-First end, 20-Terminal assembly, 30-Electrode assembly, 40-Housing, 50-Electrode tab, 60-Connecting piece. Detailed Implementation

[0061] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0062] like Figures 1 to 16 As shown, this application embodiment provides a top cover assembly. This top cover assembly is applied to a single battery cell. The single battery cell includes an electrode assembly 30. The top cover assembly includes a cover plate 10 and a terminal assembly 20. The cover plate 10 includes a main body portion 110 and a protrusion 120 connected to each other. The terminal assembly 20 is disposed on the protrusion 120. The protrusion 120 is located on the side of the main body portion 110 away from the electrode assembly 30, so that the protrusion 120 and the main body portion 110 form a height difference, which is used to extend the gap between the terminal assembly 20 and the electrode assembly 30. The height difference, H, satisfies: 0.1 mm ≤ H ≤ 10 mm.

[0063] In this embodiment, by forming a protrusion 120 on the cover plate 10 and creating a height difference of 0.1 mm to 10 mm between the protrusion 120 and the main body 110 on the side near the electrode assembly 30, the gap between the terminal assembly 20 and the electrode assembly 30 can be extended by 0.1 mm to 10 mm, thereby providing more height space for bending the tab 50 and facilitating the installation of the tab 50, the connecting piece 60, and other structures disposed between the terminal assembly 20 and the electrode assembly 30.

[0064] It is understood that the protrusion 120 and the main body 110 are located on different height planes, thus creating a height difference between the protrusion 120 and the main body 110 on the side closer to the electrode assembly 30. Since the protrusion 120 is located on the side of the main body 110 away from the electrode assembly 30, regardless of the thickness between the protrusion 120 and the main body 110, a height difference can be created between the protrusion 120 and the main body 110 on the side closer to the electrode assembly 30. In some embodiments, the protrusion 120 and the main body 110 have the same thickness; in this case, the height difference between the protrusion 120 and the main body 110 on the side away from the electrode assembly 30 is also set to 0.1 mm to 10 mm. Of course, the thicknesses of the protrusion 120 and the main body 110 can also be different, and the thicknesses of the protrusion 120 and the main body 110 can be reasonably selected according to the model of the individual battery cell, the application scenario, etc.

[0065] It should be noted that the main body 110 and the protrusion 120 are integrally formed. Since the cover plate 10 includes the protruding protrusion 120, the protrusion 120 not only extends the height space between the terminal assembly 20 and the electrode assembly 30, but also enhances the strength of the cover plate 10. Therefore, the cover plate 10 can be thinned, reducing its design thickness and lowering its material cost.

[0066] In some embodiments, the height difference between the protrusion 120 and the main body 110 on the side near the electrode assembly 30 is set to 0.1 mm, 2 mm, 5 mm, 8 mm, 10 mm, or any value between the two. This ensures that the protrusion 120 of the cover plate 10 and the electrode assembly 30 are in a non-compressive fit, and greatly increases the internal space of the individual battery cell, facilitating the bending of the tab 50 and the installation of the connecting piece 60.

[0067] When the height difference between the protrusion 120 and the main body 110 is greater than 10 mm, the protrusion 120 will protrude excessively. This will affect the appearance of the individual battery cell and increase its height too much, requiring the battery box to be raised to accommodate the individual cells, thus impacting its subsequent use and installation. In this embodiment, the height difference between the protrusion 120 and the main body 110 is less than or equal to 10 mm. Since there is already a certain amount of redundant space between the battery box cover and the top surface of the individual battery cell, there is no need to change the shape of the battery box, allowing it to adapt to existing battery boxes and avoiding additional design costs.

[0068] In some embodiments, the main body 110 is disposed around the periphery of the protrusion 120. Alternatively, the protrusion 120 may be one or two protrusion structures disposed at any position on the main body 110.

[0069] When the top cover assembly in this embodiment is applied to a square battery cell, the cover plate 10 is square. Correspondingly, the main body 110 and the protrusion 120 are also square. When the top cover assembly in this embodiment is applied to a cylindrical battery cell, the cover plate 10 is circular. Correspondingly, the main body 110 and the protrusion 120 are also circular.

[0070] In some embodiments, the shape of the protrusion 120 is different from the shape of the cover plate 10. For example, when the cover plate 10 is square, the protrusion 120 can be other shapes such as round, elliptical, or waist-shaped.

[0071] like Figure 3 and Figure 5 As shown, in some embodiments, the terminal assembly 20 includes a positive terminal and a negative terminal spaced apart. The projection of the protrusion 120 along the direction from the cover plate 10 to the electrode assembly 30 at least covers the entire area between the positive and negative terminals. Alternatively, the protrusions 120 are spaced apart, with the positive terminal on one protrusion 120 and the negative terminal on the other.

[0072] It is understood that each individual battery cell has a positive and a negative electrode, corresponding to the terminal assembly 20 including a positive terminal and a negative terminal. Since the protrusion 120 can cover the positive and negative terminals, it can ensure that the protrusion 120 can provide more height space for the tab 50 to bend and the connecting piece 60 to facilitate the assembly of the individual battery cells.

[0073] like Figure 3 As shown, the projection of the protrusion 120 covers at least the entire area from the positive terminal to the negative terminal, ensuring that the distance between the positive terminal and the electrode assembly 30, and between the negative terminal and the electrode assembly 30, can be extended. Since the connecting piece 60 and the bent tab 50 must be positioned between the positive terminal and the electrode assembly 30 or between the negative terminal and the electrode assembly 30, the protrusion 120 can provide more height space for bending the tab 50 and the connecting piece 60, facilitating the assembly of individual cells. Simultaneously, there is a portion of height space between the positive and negative terminals that is offset from the connecting piece 60 and the tab 50. This portion of height space can serve as a storage space for the electrolyte. After electrolyte injection, this portion of height space can temporarily store a portion of the electrolyte, allowing the electrolyte to slowly permeate downwards into the electrode assembly 30, ensuring sufficient wetting by the electrolyte.

[0074] like Figure 5As shown, the protrusions 120 are spaced two apart, with the positive terminal located on one protrusion 120 and the negative terminal on the other. This ensures that the distance between the positive terminal and the electrode assembly 30, and between the negative terminal and the electrode assembly 30, can be extended. Since the connecting piece 60 and the bent tab 50 must be located between the positive terminal and the electrode assembly 30 or between the negative terminal and the electrode assembly 30, the protrusions 120 can provide more height space for bending the tab 50 and the connecting piece 60, facilitating the assembly of individual battery cells.

[0075] Please continue reading. Figure 4 In some embodiments, the main body 110 is disposed around the periphery of the protrusion 120. The length of the main body 110 is m, and the length of the protrusion 120 is n, satisfying: 0.5m ≤ n ≤ m - k1. And / or, the width of the main body 110 is p, and the width of the protrusion 120 is q, satisfying: 0.5p ≤ q ≤ p - k2. Wherein, both k1 and k2 are greater than 0.

[0076] It is understood that the length of the protrusion 120 is at least half the length of the main body 110, and / or the width of the protrusion 120 is half the width of the main body 110, to ensure that the protrusion 120 has sufficient area to mount the terminal assembly 20. The length of the protrusion 120 is less than the length of the main body 110, and / or the width of the protrusion 120 is less than the width of the main body 110, to provide sufficient space on the main body 110 for connecting the housing 40.

[0077] In some embodiments, the length of the main body 110 and the length of the protrusion 120 may only satisfy the relationship 0.5m≤n≤m-k1; or, the width of the main body 110 and the width of the protrusion 120 may only satisfy the relationship 0.5p≤q≤p-k2; or, the length of the main body 110 and the length of the protrusion 120 may satisfy the relationship 0.5m≤n≤m-k1, and the width of the main body 110 and the width of the protrusion 120 may satisfy the relationship 0.5p≤q≤p-k2.

[0078] For example, k1 = 5 mm, k2 = 2 mm. Alternatively, k1 and k2 can be other values ​​based on the model of the individual battery cell and the usage requirements. For example, k1 = 8 mm, k2 = 4 mm. The values ​​of k1 and k2 are not limited in the embodiments of this application.

[0079] For example, m = 110 mm, n = 100 mm, k1 = 5 mm. p = 35 mm, q = 28 mm, k2 = 2 mm.

[0080] Please continue reading. Figure 4In some embodiments, the periphery of the protrusion 120 includes an arc segment with a radius of R, satisfying: 0 < R < 0.5q.

[0081] In some embodiments, the protrusion 120 is configured as a quadrilateral, with each of the four corners being an arc segment. The structure of each arc segment may be the same or different. The integrity of the protrusion 120's shape is ensured by making the radius of each arc segment less than half the width of the protrusion 120.

[0082] For example, R = 7 mm, q = 28 mm.

[0083] like Figure 3 and Figure 16 As shown, in some embodiments, the cover plate 10 further includes a connecting portion 130. The connecting portion 130 connects the main body portion 110 and the protrusion 120. The connecting portion 130 is inclined towards the main body portion 110 along the direction from the cover plate 10 to the electrode assembly 30. The inclination angle of the connecting portion 130 is α, satisfying: 20°≤α≤70°.

[0084] It is understandable that since the protrusion 120 and the main body 110 are located on different height planes, a connecting part 130 is needed to connect them. The connecting part 130 is inclined towards the main body 110 in the direction from the cover plate 10 to the electrode assembly 30 to facilitate demolding of the cover plate 10 after molding.

[0085] Based on the arrangement of the first connecting portion 130, the main body portion 110, the protrusion 120, and the first connecting portion 130 can form a receiving space on the side near the electrode assembly 30. This receiving space can extend the distance between the terminal assembly 20 and the electrode assembly 30, and can be used to accommodate the tab 50, the connecting piece 60, the pole of the terminal assembly 20, etc.

[0086] When the height difference between the protrusion 120 and the main body 110 remains constant, the smaller the inclination angle of the connecting part 130, the longer the connecting part 130; conversely, the larger the inclination angle of the connecting part 130, the shorter its length. When the inclination angle of the connecting part 130 is less than 20°, the length of the connecting part 130 is too long, resulting in a longer cover plate 10 or a smaller gap between the edge of the main body 110 and the cover plate 10, which is not conducive to the assembly of the cover plate 10 and the housing 40. When the inclination angle of the connecting part 130 is greater than 70°, the length of the connecting part 130 is too short and the inclination angle is too large, which is not conducive to the molding and demolding of the cover plate 10.

[0087] For example, the tilt angle of the connecting part 130 can be set to 20°, 50°, 70°, or any value between the two.

[0088] like Figure 6 , Figure 10 and Figure 11 As shown, in some embodiments, the cover plate 10 includes a top cover plate 140. The top cover plate 140 includes a first main body portion 1410, a first protrusion 1420, and a first connecting portion 1430 connecting the first main body portion 1410 and the first protrusion 1420. The first protrusion 1420 protrudes in a direction away from the electrode assembly 30. The first connecting portion 1430 includes a first side away from the electrode assembly 30 and a second side close to the electrode assembly 30. The first side has a first arcuate surface 1440 close to the first main body portion 1410 and a second arcuate surface 1450 close to the first protrusion 1420. The second side has a third arcuate surface 1460 close to the first main body portion 1410 and a fourth arcuate surface 1470 close to the first protrusion 1420. The first arcuate surface 1440 and the third arcuate surface 1460 are both curved in a direction close to the electrode assembly 30. The second arcuate surface 1450 and the fourth arcuate surface 1470 are both curved in a direction away from the electrode assembly 30. The radius corresponding to the first arc surface 1440 is R1, the radius corresponding to the second arc surface 1450 is R2, the radius corresponding to the third arc surface 1460 is R3, and the radius corresponding to the fourth arc surface 1470 is R4, satisfying: 0 < R1 ≤ 10 mm, 0 < R2 ≤ 6 mm, 0 < R3 ≤ 6 mm, and 0 < R4 ≤ 10 mm.

[0089] Understandably, forming a first protrusion 1420 on the top cover 140 can extend the gap between the terminal assembly 20 and the electrode assembly 30. Specifically, on the side near the electrode assembly 30, the height difference between the first protrusion 1420 and the first main body portion 1410 is set to 0.1 mm to 10 mm. This extends the gap between the terminal assembly 20 and the electrode assembly 30 by 0.1 mm to 10 mm, thereby providing more height space for bending the tab 50, facilitating the installation of the tab 50, the connecting piece 60, and other structures disposed between the terminal assembly 20 and the electrode assembly 30.

[0090] Based on the formation of a first arc surface 1440 and a second arc surface 1450 on the first side of the first connecting portion 1430, and the formation of a third arc surface 1460 and a fourth arc surface 1470 on the second side of the first connecting portion 1430, it is convenient to form the top cover sheet 140. When the top cover sheet 140 is assembled with the upper insulating sheet 150 and the lower plastic 160, a gap can be formed at the position of the first connecting portion 1430. Based on the gap fit, it is more convenient to assemble the top cover sheet 140, the insulating sheet 150 and the lower plastic 160.

[0091] In this embodiment, based on the coordinated operation of the values ​​of R1, R2, R3, and R4, the length of the first connecting portion 1430 can be controlled. On the other hand, when the insulating sheet 150 is disposed on the top cover sheet 140, the two can form a gap fit near the first connecting portion 1430. When the plastic sheet 160 is disposed on the top cover sheet 140, the two can form a gap fit near the first connecting portion 1430.

[0092] It should be noted that the values ​​of R1, R2, R3, and R4 are independent of each other. The values ​​of R1 and R4 can be the same or different, and the values ​​of R2 and R3 can also be the same or different, as long as R1, R2, R3, and R4 are within their respective ranges. For example, R1 = 8 mm, R2 = 2 mm, R3 = 2 mm, and R4 = 8 mm.

[0093] In some embodiments, the first main body portion 1410, the first protrusion portion 1420, and the first connecting portion 1430 have the same thickness. Alternatively, the thicknesses of the first main body portion 1410, the first protrusion portion 1420, and the first connecting portion 1430 may differ.

[0094] In some embodiments, the first main body portion 1410, the first protrusion portion 1420, and the first connecting portion 1430 are integrally formed. For example, the top cover sheet 140 is an aluminum sheet, and the first main body portion 1410, the first protrusion portion 1420, and the first connecting portion 1430 are integrally stamped.

[0095] In some embodiments, along the direction from the cover plate 10 to the electrode assembly 30, the first connecting portion 1430 is inclined toward the first main body portion 1410, and the inclination angle is set in the range of 20° to 70°.

[0096] In some embodiments, the length relationship between the first main body portion 1410 and the first protrusion 1420 also satisfies the aforementioned length relationship between the main body portion 110 and the protrusion 120. And / or, the width relationship between the first main body portion 1410 and the first protrusion 1420 also satisfies the aforementioned width relationship between the main body portion 110 and the protrusion 120.

[0097] like Figure 7 and Figure 9As shown, in some embodiments, the cover plate 10 further includes an insulating sheet 150. The insulating sheet 150 is connected to the side of the top cover plate 140 away from the electrode assembly 30. The insulating sheet 150 includes a second main body portion 1510, a second protrusion portion 1520, and a second connecting portion 1530 connecting the second main body portion 1510 and the second protrusion portion 1520. The second protrusion portion 1520 protrudes in a direction away from the electrode assembly 30. The second main body portion 1510 abuts against the first main body portion 1410. The second protrusion portion 1520 abuts against the first protrusion portion 1420. The second connecting portion 1530 is spaced apart from the first connecting portion 1430.

[0098] Understandably, forming a second protrusion 1520 on the insulating sheet 150 can extend the gap between the terminal assembly 20 and the electrode assembly 30. Specifically, on the side near the electrode assembly 30, the height difference between the second protrusion 1520 and the second main body portion 1510 is set to 0.1 mm to 10 mm. This extends the gap between the terminal assembly 20 and the electrode assembly 30 by 0.1 mm to 10 mm, thereby providing more height space for bending the tab 50, facilitating the installation of the tab 50, the connecting piece 60, and other structures disposed between the terminal assembly 20 and the electrode assembly 30.

[0099] It should be noted that the clearance fit between the first connecting portion 1430 and the second connecting portion 1530 makes the assembly between the insulating sheet 150 and the top cover sheet 140 easier and can slightly reduce the processing precision of the insulating sheet 150 and the top cover sheet 140. When the first connecting portion 1430 and the second connecting portion 1530 are tightly fitted, if the thickness of the first connecting portion 1430 and / or the second connecting portion 1530 is too large due to tolerances, it will cause the first connecting portion 1430 and the second connecting portion 1530 to not fit together, or cause the first main body portion 1410 and the second main body portion 1510 to not fit together, or cause the first protrusion portion 1420 and the second protrusion portion 1520 to not fit together, in which case the insulating sheet 150 or the top cover sheet 140 needs to be reworked. The embodiments of this application, based on the spacing between the first connecting portion 1430 and the second connecting portion 1530, can reduce precision requirements and improve installation efficiency.

[0100] In some embodiments, the second main body portion 1510, the second protrusion portion 1520, and the second connecting portion 1530 have the same thickness. Alternatively, the thicknesses of the second main body portion 1510, the second protrusion portion 1520, and the second connecting portion 1530 may differ.

[0101] In some embodiments, the second main body portion 1510, the second protrusion portion 1520, and the second connecting portion 1530 are integrally formed. For example, the insulating sheet 150 is a plastic part, and the insulating sheet 150 is bonded to the side of the top cover sheet 140 away from the electrode assembly 30. The second main body portion 1510, the second protrusion portion 1520, and the second connecting portion 1530 are integrally injection molded.

[0102] In some embodiments, along the direction from the cover plate 10 to the electrode assembly 30, the second connecting portion 1530 is inclined toward the second main body portion 1510, and the inclination angle is set in the range of 20° to 70°.

[0103] In some embodiments, the length relationship between the second main body portion 1510 and the second protrusion portion 1520 also satisfies the aforementioned length relationship between the main body portion 110 and the protrusion portion 120. And / or, the width relationship between the second main body portion 1510 and the second protrusion portion 1520 also satisfies the aforementioned width relationship between the main body portion 110 and the protrusion portion 120.

[0104] It should be noted that, since the insulating sheet 150 is located on the side of the top cover sheet 140 away from the electrode assembly 30, the length of the second protrusion 1520 is slightly greater than the length of the first protrusion 1420, and the width of the second protrusion 1520 is slightly greater than the width of the first protrusion 1420, so as to ensure that the insulating sheet 150 can be connected to the outside of the top cover sheet 140.

[0105] like Figure 12 and Figure 13 As shown, in some embodiments, the second connecting portion 1530 includes a third side away from the top cover plate 140 and a fourth side near the top cover plate 140. The third side has a fifth arcuate surface 1540 near the second main body portion 1510 and a sixth arcuate surface 1550 near the second protrusion 1520. The fourth side has a seventh arcuate surface 1560 near the second main body portion 1510 and an eighth arcuate surface 1570 near the second protrusion 1520. The fifth arcuate surface 1540 and the seventh arcuate surface 1560 are both curved towards the top cover plate 140. The sixth arcuate surface 1550 and the eighth arcuate surface 1570 are both curved away from the top cover plate 140. The radius corresponding to the fifth arc surface 1540 is R5, the radius corresponding to the sixth arc surface 1550 is R6, the radius corresponding to the seventh arc surface 1560 is R7, and the radius corresponding to the eighth arc surface 1570 is R8, satisfying: 0 < R5 ≤ R7 ≤ 5 mm, 0 < R8 ≤ R6 ≤ 2 mm.

[0106] It is understandable that the formation of the fifth arc surface 1540 and the sixth arc surface 1550 on the third side of the second connecting portion 1530, and the formation of the seventh arc surface 1560 and the eighth arc surface 1570 on the fourth side of the second connecting portion 1530, facilitates the forming of the insulating sheet 150. Furthermore, after the insulating sheet 150 is assembled onto the top cover sheet 140, a gap can be formed between the first connecting portion 1430 and the second connecting portion 1530. Based on the gap fit, it is more convenient to assemble the insulating sheet 150 and the top cover sheet 140.

[0107] In this embodiment, based on the coordinated use of the values ​​of R5, R6, R7, and R8, the length of the second connecting portion 1530 can be controlled. On the other hand, when the insulating sheet 150 is disposed on the top cover sheet 140, a gap can be formed between the two between the first connecting portion 1430 and the second connecting portion 1530.

[0108] It should be noted that the values ​​of R5, R6, R7, and R8 are independent of each other. The values ​​of R5 and R7 can be the same or different, and the values ​​of R6 and R8 can also be the same or different, as long as R5, R6, R7, and R8 are within their respective ranges. For example, R5 = 3 mm, R6 = 1.2 mm, R7 = 4 mm, and R8 = 1 mm.

[0109] like Figure 8 and Figure 9 As shown, in some embodiments, the cover plate 10 further includes a lower plastic portion 160. The lower plastic portion 160 is connected to the side of the top cover plate 140 near the electrode assembly 30. The lower plastic portion 160 includes a third main body portion 1610, a third protrusion portion 1620, and a third connecting portion 1630 connecting the third main body portion 1610 and the third protrusion portion 1620. The third protrusion portion 1620 protrudes in a direction away from the electrode assembly 30. The third main body portion 1610 abuts against the first main body portion 1410, the third protrusion portion 1620 abuts against the first protrusion portion 1420, and the third connecting portion 1630 is spaced apart from the first connecting portion 1430.

[0110] Understandably, forming a third protrusion 1620 on the insulating sheet 150 can extend the gap between the terminal assembly 20 and the electrode assembly 30. Specifically, on the side near the electrode assembly 30, the height difference between the third protrusion 1620 and the third main body portion 1610 is set to 0.1 mm to 10 mm. This extends the gap between the terminal assembly 20 and the electrode assembly 30 by 0.1 mm to 10 mm, thereby providing more height space for bending the tab 50, facilitating the installation of the tab 50, the connecting piece 60, and other structures disposed between the terminal assembly 20 and the electrode assembly 30.

[0111] It should be noted that the clearance fit between the first connecting portion 1430 and the third connecting portion 1630 makes the assembly between the lower plastic 160 and the top cover plate 140 easier and can slightly reduce the processing precision of the lower plastic 160 and the top cover plate 140. When the first connecting portion 1430 and the third connecting portion 1630 are tightly fitted, if the thickness of the first connecting portion 1430 and / or the third connecting portion 1630 is too large due to tolerances, it will cause the first connecting portion 1430 and the third connecting portion 1630 to not fit together, or cause the first main body portion 1410 and the third main body portion 1610 to not fit together, or cause the first protrusion portion 1420 and the third protrusion portion 1620 to not fit together, in which case the lower plastic 160 or the top cover plate 140 needs to be reworked. The embodiments of this application, by setting the first connecting portion 1430 and the third connecting portion 1630 at intervals, can reduce precision requirements and improve installation efficiency.

[0112] In some embodiments, the third main body portion 1610, the third protrusion portion 1620, and the third connecting portion 1630 have the same thickness. Alternatively, the thicknesses of the third main body portion 1610, the third protrusion portion 1620, and the third connecting portion 1630 may differ.

[0113] In some embodiments, the third main body portion 1610, the third protrusion portion 1620, and the third connecting portion 1630 are integrally injection molded.

[0114] In some embodiments, along the direction from the cover plate 10 to the electrode assembly 30, the third connecting portion 1630 is inclined toward the third main body portion 1610, and the inclination angle is set in the range of 20° to 70°.

[0115] In some embodiments, the length relationship between the third main body portion 1610 and the third protrusion portion 1620 also satisfies the aforementioned length relationship between the main body portion 110 and the protrusion portion 120. And / or, the width relationship between the third main body portion 1610 and the third protrusion portion 1620 also satisfies the aforementioned width relationship between the main body portion 110 and the protrusion portion 120.

[0116] It should be noted that since the lower plastic 160 is located on the side of the top cover plate 140 close to the electrode assembly 30, the length of the third protrusion 1620 is slightly less than the length of the first protrusion 1420, and the width of the third protrusion 1620 is slightly less than the width of the first protrusion 1420, so as to ensure that the lower plastic 160 can be connected to the inside of the top cover plate 140.

[0117] like Figure 14 and Figure 15As shown, in some embodiments, the third connecting portion 1630 includes a fifth side near the top cover plate 140 and a sixth side away from the top cover plate 140. The fifth side has a ninth arcuate surface 1640 near the third main body portion 1610 and a tenth arcuate surface 1650 near the third protrusion 1620. The sixth side has an eleventh arcuate surface 1660 near the third main body portion 1610 and a twelfth arcuate surface 1670 near the third protrusion 1620. The ninth arcuate surface 1640 and the eleventh arcuate surface 1660 are both curved away from the top cover plate 140. The tenth arcuate surface 1650 and the twelfth arcuate surface 1670 are both curved towards the top cover plate 140. The radius corresponding to the ninth arc surface 1640 is R9, the radius corresponding to the tenth arc surface 1650 is R10, the radius corresponding to the eleventh arc surface 1660 is R11, and the radius corresponding to the twelfth arc surface 1670 is R12, satisfying: 0 < R9 ≤ R11 ≤ 2 mm, 0 < R12 ≤ R10 ≤ 5 mm.

[0118] It is understandable that the formation of the ninth arc surface 1640 and the tenth arc surface 1650 on the fifth side of the third connecting part 1630, and the formation of the eleventh arc surface 1660 and the twelfth arc surface 1670 on the sixth side of the third connecting part 1630, facilitates the molding of the lower plastic 160. It also allows a gap to be formed between the first connecting part 1430 and the third connecting part 1630 after the lower plastic 160 is connected to the top cover plate 140. The gap fit makes it easier to assemble the lower plastic 160 and the top cover plate 140.

[0119] In this embodiment of the application, based on the coordinated use of the values ​​of R9, R10, R11, and R12, the length of the third connecting part 1630 can be controlled on the one hand, and on the other hand, after the plastic 160 is connected to the top cover 140, a gap can be formed between the two of them, the first connecting part 1430 and the third connecting part 1630.

[0120] It should be noted that the values ​​of R9, R10, R11, and R12 are independent of each other. The values ​​of R9 and R11 can be the same or different, and the values ​​of R10 and R12 can also be the same or different, as long as R9, R10, R11, and R12 are within their respective ranges. For example, R9 = 1 mm, R10 = 4 mm, R11 = 1.3 mm, and R12 = 3 mm.

[0121] Please continue reading. Figure 8 In some embodiments, the third body portion 1610 is formed with a groove 1680 with the opening facing the top cover plate 140, and a through hole 1690 is formed on the bottom surface of the groove 1680. The through hole 1690 is configured to allow electrolyte sputtered onto the lower plastic 160 to flow into the housing 40.

[0122] Understandably, since the lower plastic 160 is located between the top cover plate 140 and the electrode assembly 30, when electrolyte is injected into the housing 40 through the injection hole on the top cover plate 140, some electrolyte may splash onto the upper surface of the lower plastic 160. When this happens, the electrolyte splashed onto the upper surface of the lower plastic 160 can flow into the groove 1680 and into the housing 40 through the through hole 1690 on the bottom surface of the groove 1680, effectively preventing electrolyte from accumulating between the lower plastic 160 and the top cover plate 140.

[0123] Please continue reading. Figure 8 The grooves 1680 are provided at opposite ends along the length of the third main body 1610. Based on the design of the grooves 1680, the opposite ends of the third main body 1610 can also be designed as hollow structures, saving material costs of the plastic 160.

[0124] In some embodiments, the bottom surface of the groove 1680 is provided with a plurality of through holes 1690, each through hole 1690 having the same or different shapes. For example, the through holes 1690 can be circular, elliptical, square, racetrack-shaped, waist-shaped, etc.

[0125] like Figure 16 As shown, in some embodiments, the groove 1680 has a first end 170 near the third connecting portion 1630, and the distance between the first end 170 and the third connecting portion 1630 along the first direction is W, which satisfies: W≥0.3 mm.

[0126] It is understandable that forming the groove 1680 on the third main body portion 1610 will reduce the contact area between the first main body portion 1410 and the third main body portion 1610. The distance between the first end 170 of the groove 1680 and the third connecting portion 1630 is greater than or equal to 0.3 mm to ensure that the contact area between the first main body portion 1410 and the third main body portion 1610 is large enough so that the lower plastic 160 can support the top cover sheet 140.

[0127] For example, the distance between the first end 170 and the third connecting part 1630 is set to 0.3 mm, 0.5 mm, 1 mm, 2 mm, or any value between the two.

[0128] like Figure 1 As shown in the embodiments, this application also provides a single battery cell. This single battery cell includes the top cover assembly as described in the foregoing embodiments.

[0129] In this embodiment, by forming a protrusion 120 on the cover plate 10 and creating a height difference of 0.1 mm to 10 mm between the protrusion 120 and the main body 110 on the side near the electrode assembly 30, the gap between the terminal assembly 20 and the electrode assembly 30 can be extended by 0.1 mm to 10 mm, thereby providing more height space for bending the tab 50 and facilitating the installation of the tab 50, the connecting piece 60, and other structures disposed between the terminal assembly 20 and the electrode assembly 30.

[0130] Please continue reading. Figure 1 and Figure 2 In some embodiments, the individual battery cell further includes a housing 40, an electrode assembly 30, and a connecting piece 60. A cover plate 10 is connected to the housing 40. The electrode assembly 30 is disposed within the housing 40. The electrode assembly 30 is connected to tabs 50. The connecting piece 60 is disposed within the housing 40. The connecting piece 60 is located between the electrode assembly 30 and the cover plate 10, and is electrically connected to the terminal assembly 20. The tabs 50 are bent and welded to the connecting piece 60. Along the direction from the cover plate 10 to the electrode assembly 30, the projection of the protrusion 120 at least covers the connecting piece 60 and / or the tabs 50.

[0131] Understandably, the housing 40 serves as a component for housing and protecting the electrode assembly 30, while the tab 50 is a connector for the electrode assembly 30 to supply power externally. The tab 50 is bent and welded to the connecting piece 60, and electrically connected to the terminal assembly 20 via the connecting piece 60 to enable the individual battery cell to supply power externally. Along the direction from the cover plate 10 to the electrode assembly 30, the projection of the protrusion 120 at least covers the connecting piece 60 and / or the tab 50, thus providing more height space for the connecting piece 60 and / or the tab 50, facilitating the installation of the connecting piece 60 and / or the bending of the tab 50.

[0132] In some embodiments, along the direction from the cover plate 10 to the electrode assembly 30, the projection of the protrusion 120 covers only the connecting piece 60. Alternatively, the projection of the protrusion 120 covers only the tab 50. Alternatively, the projection of the protrusion 120 covers both the connecting piece 60 and the tab 50.

[0133] When the individual battery cell is a square cell, the housing 40 is set to square. When the individual battery cell is a cylindrical cell, the housing 40 is set to cylindrical.

[0134] It should be noted that the top cover assembly and the housing 40 can be welded together, and a seal is provided at the connection between the top cover assembly and the housing 40 to achieve a sealed connection between the two.

[0135] In some embodiments, the connecting piece 60 includes a positive electrode connecting piece and a negative electrode connecting piece. Specifically, along the direction from the cover plate 10 to the electrode assembly 30, the projection of the protrusion 120 at least covers the entire area between the positive electrode connecting piece and the negative electrode connecting piece; or, the protrusions 120 are spaced apart as two, with the projection of one protrusion 120 at least covering the positive electrode connecting piece and the projection of the other protrusion 120 at least covering the negative electrode connecting piece along the direction from the cover plate 10 to the electrode assembly 30.

[0136] Understandably, since a single battery cell has a positive and a negative electrode, the terminal assembly 20 needs to include a positive terminal and a negative terminal accordingly. The positive terminal connector is welded to the positive terminal, and the negative terminal connector is welded to the negative terminal. Because the protrusion 120 can cover both the positive and negative terminal connectors, it ensures that the protrusion 120 provides more height space for them. When the positive electrode tab is bent and welded to the side of the positive terminal connector facing the electrode assembly 30, and the negative electrode tab is bent and welded to the side of the negative terminal connector facing the electrode assembly 30, the protrusion 120 will inevitably cover the bending areas of both the positive and negative electrode tabs. Therefore, the protrusion 120 can also provide more height space for bending the tab 50.

[0137] For example, the projection of the protrusion 120 covers at least the entire area between the positive and negative electrode connecting pieces, ensuring that the height of the space containing the positive and negative electrode connecting pieces is increased, thus providing more height space for the positive and negative electrode connecting pieces and facilitating the assembly of individual battery cells. Simultaneously, there is also a portion of height space between the positive and negative electrode connecting pieces that is offset from the connecting piece 60 and the tab 50. This portion of height space can serve as a storage space for the electrode electrolyte. After electrolyte injection is completed, this portion of height space can temporarily store a portion of the electrolyte, allowing the electrolyte to slowly permeate downwards into the electrode assembly 30, ensuring sufficient electrolyte wetting.

[0138] For example, the protrusions 120 are spaced in two, with one protrusion 120 corresponding to the positive electrode connecting piece and the other protrusion 120 corresponding to the negative electrode connecting piece. This can ensure that the height of the space where the positive electrode connecting piece and the negative electrode connecting piece are located is increased, thereby providing more height space for the positive electrode connecting piece and the negative electrode connecting piece, and facilitating the assembly of individual battery cells.

[0139] In some embodiments, the tab 50 includes a positive tab and a negative tab. The positive tab is bent and welded to the positive connecting piece, and the negative tab is bent and welded to the negative connecting piece. The projection of the protrusion 120 along the direction from the cover plate 10 to the electrode assembly 30 at least covers the entire area between the positive and negative tabs; or, the protrusions 120 are spaced apart as two, with the projection of one protrusion 120 at least covering the positive tab and the projection of the other protrusion 120 at least covering the negative tab along the direction from the cover plate 10 to the electrode assembly 30.

[0140] Understandably, since a single battery cell has a positive and a negative electrode, the terminal assembly 20 needs to include a positive terminal and a negative terminal accordingly. The positive terminal connector is welded to the positive terminal, and the negative terminal connector is welded to the negative terminal. All positive electrode tabs are bent and welded to the positive terminal connector, and all negative electrode tabs are bent and welded to the negative terminal connector. Because the protrusion 120 can cover both the positive and negative electrode tabs, it ensures that the protrusion 120 provides more height space for bending both the positive and negative electrode tabs. When the positive electrode tab is bent and welded to the side of the positive terminal connector away from the electrode assembly 30, and the negative electrode tab is bent and welded to the side of the negative terminal connector away from the electrode assembly 30, the protrusion 120 will also inevitably cover both the positive and negative terminal connectors. Therefore, the protrusion 120 can also provide more height space for the positive and negative terminal connectors.

[0141] For example, the projection of the protrusion 120 covers at least the entire area from the positive electrode tab to the negative electrode connecting tab 50, ensuring that the height of the space containing the positive and negative electrode tabs is increased. This provides more height space for bending the positive and negative electrode tabs and facilitates the assembly of individual battery cells. Simultaneously, there is a portion of height space between the positive and negative electrode tabs that is offset from the connecting piece 60 and the tab 50. This portion of height space can serve as a storage space for the electrolyte. After electrolyte injection is completed, this portion of height space can temporarily store a portion of the electrolyte, allowing it to slowly permeate downwards into the electrode assembly 30, ensuring sufficient wetting by the electrolyte.

[0142] For example, the protrusions 120 are spaced in two, with one protrusion 120 corresponding to the positive electrode tab and the other protrusion 120 corresponding to the negative electrode tab. This ensures that the height of the space where the positive and negative electrode tabs are located is increased, thereby providing more height space for bending the positive and negative electrode tabs and facilitating the assembly of individual battery cells.

[0143] This application also provides a battery pack. The battery pack includes individual battery cells as described in the foregoing embodiments.

[0144] In this embodiment, by forming a protrusion 120 on the cover plate 10 and creating a height difference of 0.1 mm to 10 mm between the protrusion 120 and the main body 110 on the side near the electrode assembly 30, the gap between the terminal assembly 20 and the electrode assembly 30 can be extended by 0.1 mm to 10 mm, thereby providing more height space for bending the tab 50 and facilitating the installation of the tab 50, the connecting piece 60, and other structures disposed between the terminal assembly 20 and the electrode assembly 30.

[0145] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A top cover assembly applied to a single battery cell, the single battery cell including an electrode assembly, characterized in that, The top cover assembly includes: The cover plate includes an interconnected main body and a protrusion; Terminal assembly is provided on the protrusion; The protrusion is located on the side of the main body away from the electrode assembly, so that the protrusion and the main body form a height difference, which is used to extend the distance between the terminal assembly and the electrode assembly. The height difference is H, which satisfies: 0.1 mm ≤ H ≤ 10 mm.

2. The top cover assembly according to claim 1, characterized in that, The terminal assembly includes positive and negative terminals spaced apart. Wherein, along the direction from the cover plate to the electrode assembly, the projection of the protrusion covers at least the entire area between the positive terminal and the negative terminal; or, the protrusion is spaced two at a time, with the positive terminal located on one of the protrusions and the negative terminal located on the other of the protrusions.

3. The top cover assembly according to claim 1, characterized in that, The main body is arranged around the periphery of the protrusion. The length of the main body is m, and the length of the protrusion is n, satisfying: 0.5m≤n≤m-k1; And / or, the width of the main body is p, and the width of the protrusion is q, satisfying: 0.5p≤q≤p-k2; In this case, both k1 and k2 are greater than 0.

4. The top cover assembly according to any one of claims 1 to 3, characterized in that, The cover plate also includes: A connecting portion connects the main body portion and the protrusion portion; Wherein, along the direction from the cover plate to the electrode assembly, the connecting part is inclined toward the main body, and the inclination angle of the connecting part is α, which satisfies: 20°≤α≤70°.

5. The top cover assembly according to any one of claims 1 to 3, characterized in that, The cover plate includes: The top cover includes a first main body portion, a first protrusion portion, and a first connecting portion connecting the first main body portion and the first protrusion portion, wherein the first protrusion portion protrudes in a direction away from the electrode assembly; The first connecting portion includes a first side away from the electrode assembly and a second side close to the electrode assembly. The first side has a first arc surface close to the first main body and a second arc surface close to the first protrusion. The second side has a third arc surface close to the first main body and a fourth arc surface close to the first protrusion. The first arc surface and the third arc surface are both curved towards the electrode assembly, and the second arc surface and the fourth arc surface are both curved away from the electrode assembly. The radius corresponding to the first arc surface is R1, the radius corresponding to the second arc surface is R2, the radius corresponding to the third arc surface is R3, and the radius corresponding to the fourth arc surface is R4, satisfying: 0 < R1 ≤ 10 mm, 0 < R2 ≤ 6 mm, 0 < R3 ≤ 6 mm, and 0 < R4 ≤ 10 mm.

6. The top cover assembly according to claim 5, characterized in that, The cover plate also includes: An insulating sheet is connected to the top cover sheet on the side away from the electrode assembly. The insulating sheet includes a second main body, a second protrusion, and a second connecting portion connecting the second main body and the second protrusion. The second protrusion protrudes in a direction away from the electrode assembly. The second main body abuts against the first main body, the second protrusion abuts against the first protrusion, and the second connecting part is spaced apart from the first connecting part.

7. The top cover assembly according to claim 6, characterized in that, The second connecting portion includes a third side away from the top cover plate and a fourth side close to the top cover plate. The third side has a fifth arc surface close to the second main body and a sixth arc surface close to the second protrusion. The fourth side has a seventh arc surface close to the second main body and an eighth arc surface close to the second protrusion. The fifth and seventh arc surfaces are both curved towards the top cover plate, and the sixth and eighth arc surfaces are both curved away from the top cover plate. The radius corresponding to the fifth arc surface is R5, the radius corresponding to the sixth arc surface is R6, the radius corresponding to the seventh arc surface is R7, and the radius corresponding to the eighth arc surface is R8, satisfying: 0 < R5 ≤ R7 ≤ 5 mm, 0 < R8 ≤ R6 ≤ 2 mm.

8. The top cover assembly according to claim 5, characterized in that, The cover plate also includes: The lower plastic is connected to the top cover sheet on the side near the electrode assembly. The lower plastic includes a third main body, a third protrusion, and a third connecting part connecting the third main body and the third protrusion. The third protrusion protrudes in a direction away from the electrode assembly. The third main body abuts against the first main body, the third protrusion abuts against the first protrusion, and the third connecting part is spaced apart from the first connecting part.

9. The top cover assembly according to claim 8, characterized in that, The third connecting portion includes a fifth side near the top cover plate and a sixth side away from the top cover plate. The fifth side has a ninth arc surface near the third main body and a tenth arc surface near the third protrusion. The sixth side has an eleventh arc surface near the third main body and a twelfth arc surface near the third protrusion. The ninth and eleventh arc surfaces are both curved away from the top cover plate, and the tenth and twelfth arc surfaces are both curved towards the top cover plate. The radius corresponding to the ninth arc surface is R9, the radius corresponding to the tenth arc surface is R10, the radius corresponding to the eleventh arc surface is R11, and the radius corresponding to the twelfth arc surface is R12, satisfying: 0 < R9 ≤ R11 ≤ 2 mm, 0 < R12 ≤ R10 ≤ 5 mm.

10. The top cover assembly according to claim 8, characterized in that, The third main body has a groove with its opening facing the top cover plate, and a through hole is formed on the bottom surface of the groove. The through hole is configured to allow electrolyte splashed onto the lower plastic to flow into the housing.

11. The top cover assembly according to claim 10, characterized in that, The groove has a first end near the third connecting portion, and along a first direction, the distance between the first end and the third connecting portion is W, satisfying: W≥0.3 mm.

12. A single battery cell, characterized in that, Includes the top cover assembly as described in any one of claims 1 to 11.

13. The single-cell battery according to claim 12, characterized in that, The single battery cell also includes: The housing, with the cover plate connected to the housing; An electrode assembly is disposed within the housing, and the electrode assembly is connected to tabs; A connecting piece is disposed within the housing, the connecting piece being located between the electrode assembly and the cover plate, and the connecting piece being electrically connected to the terminal assembly; Wherein, the tab is bent and welded to the connecting piece, and along the direction from the cover plate to the electrode assembly, the projection of the protrusion at least covers the connecting piece and / or the tab.

14. The single-cell battery according to claim 13, characterized in that, The connecting piece includes a positive electrode connecting piece and a negative electrode connecting piece; Wherein, along the direction from the cover plate to the electrode assembly, the projection of the protrusion at least covers the entire area between the positive electrode connecting piece and the negative electrode connecting piece; or, the protrusion is spaced two at a time, and along the direction from the cover plate to the electrode assembly, the projection of one protrusion at least covers the positive electrode connecting piece, and the projection of the other protrusion at least covers the negative electrode connecting piece.

15. The single-cell battery according to claim 14, characterized in that, The electrode tabs include a positive electrode tab and a negative electrode tab. The positive electrode tab is bent and then welded to the positive electrode connecting piece, and the negative electrode tab is bent and then welded to the negative electrode connecting piece. Wherein, along the direction from the cover plate to the electrode assembly, the projection of the protrusion at least covers the entire area between the positive electrode tab and the negative electrode tab; or, the protrusion is spaced in two, and along the direction from the cover plate to the electrode assembly, the projection of one protrusion at least covers the positive electrode tab, and the projection of the other protrusion at least covers the negative electrode tab.

16. A battery pack, characterized in that, Includes the single cell as described in any one of claims 12 to 15.

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