Cover plate assembly and single battery comprising same

Abstract

The utility model provides a cover plate assembly and a single battery comprising the same. The cover plate assembly comprises a cover plate body; the electrode terminal comprises a penetrating part and a connecting plate which are connected with each other; the insulating part covers one side, facing the electrode assembly, of the cover plate body; one of the first limiting part and the second limiting part is arranged on the side, facing the electrode assembly, of the insulating part, and the other one of the first limiting part and the second limiting part is arranged on the side, facing the insulating part, of the connecting plate; the first limiting part extends into the second limiting part, and in the height direction of the cover plate assembly, the height of the first limiting part is larger than or equal to one third of the height of the second limiting part and smaller than the height of the second limiting part. By arranging the first limiting part and the second limiting part which are matched with each other, the bottom plate can be prevented from rotating relative to the insulating part in the assembling process, so that the assembling accuracy and the product yield are improved.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a cover plate assembly and a single battery comprising the same. Background Art

[0002] At present, in the manufacturing process of square shell batteries, it is necessary to hot-melt the insulating film surrounding the outside of the electrode assembly and fix the insulating film to the insulating part located between the cover body and the electrode assembly. During this process, it is necessary to apply thrust to the insulating part, and there is a risk of displacement of the insulating part. The displacement of the insulating part will cause the assembled electrode assembly to be blocked from entering the shell normally in the subsequent shell insertion step.

[0003] Therefore, how to prevent the insulating parts from being offset during the assembly process is a technical problem that needs to be solved urgently in this field. Utility Model Content

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the insulating member is offset during the assembly process, and to provide a cover plate assembly and a single battery comprising the same.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A cover plate assembly is characterized in that it comprises:

[0007] The cover plate body has a through-hole for the pole;

[0008] an electrode terminal, the electrode terminal comprising a through-portion and a connecting plate connected to each other, the through-portion at least partially passing through the electrode through-hole, and the connecting plate being located on a side of the cover body facing the electrode assembly;

[0009] an insulating member, the insulating member covering a side of the cover plate body facing the electrode assembly and located between the cover plate body and the connecting plate;

[0010] a first limiting portion and a second limiting portion, wherein one of the first limiting portion and the second limiting portion is provided on a side of the insulating member facing the electrode assembly, and the other is provided on a side of the connecting plate facing the insulating member;

[0011] The first limiting portion extends into the second limiting portion, and along the height direction of the cover assembly, the height of the first limiting portion is greater than or equal to one third of the height of the second limiting portion and less than the height of the second limiting portion.

[0012] In the present technical solution, by providing a first limiting portion and a second limiting portion that cooperate with each other to limit the relative movement between the connecting plate and the insulating part, the insulating part can be prevented from being offset during the assembly process, thereby improving the accuracy of assembly and the yield of the product; further, by limiting the relationship between the height of the first limiting portion and the height of the second limiting portion, on the one hand, the first limiting portion located in the second limiting portion is prevented from protruding beyond the second limiting portion and interfering with the assembly of nearby components; on the other hand, the matching portion of the first limiting portion and the second limiting portion is prevented from being too short and failing to limit the relative movement between the connecting plate and the insulating part.

[0013] Preferably, a partial area on a side of the insulating member facing the electrode assembly protrudes toward the electrode assembly to form the first limiting portion, and a partial area on a side of the connecting plate facing the insulating member is recessed toward a direction away from the insulating member to form the second limiting portion; or,

[0014] A partial area on the side of the insulating member facing the electrode assembly is recessed away from the electrode assembly to form the second limiting portion, and a partial area on the side of the connecting plate facing the insulating member is protruded toward the insulating member to form the first limiting portion.

[0015] In the present technical solution, through the above-mentioned arrangement, a specific arrangement method of the first limiting portion and the second limiting portion is provided, which can achieve more effective restriction of the relative movement between the connecting plate and the insulating member.

[0016] Preferably, the first limiting portion is engaged with the second limiting portion; the first limiting portion is a boss, and the second limiting portion is a through hole or a groove; and / or,

[0017] The number of the first limiting parts corresponds to the number of the second limiting parts, and there is at least one of each.

[0018] In the present technical solution, the above-mentioned configuration provides a specific configuration method of the first limiting portion and the second limiting portion.

[0019] Preferably, the boss is a ring-shaped structure.

[0020] In this technical solution, the boss is provided with a ring-shaped structure, that is, the middle area of ​​the boss is hollowed out, thereby reducing the weight of the boss, thereby reducing the overall weight of the insulating member while maintaining the structural strength of the boss.

[0021] Preferably, the boss is a circular boss; or,

[0022] The boss is an elliptical boss, and the long axis direction of the elliptical boss corresponds to the width direction of the cover assembly; or,

[0023] The boss is a runway-shaped boss, and the long side direction of the runway-shaped boss is arranged to correspond to the width direction of the cover plate assembly.

[0024] In this technical solution, by setting the boss of the ring structure as a circular boss, it can be facilitated in production. By setting the boss of the ring structure as an elliptical boss, with the long axis direction of the elliptical boss corresponding to the width direction of the cover plate assembly, the relative movement between the connecting plate and the insulating member can be better restricted, and the influence of the expansion and contraction of the insulating member on the boss structure can be avoided. By setting the boss of the ring structure as a runway-shaped boss, with the long side direction of the runway-shaped boss corresponding to the width direction of the cover plate assembly, the relative movement between the connecting plate and the insulating member can be better restricted, and the influence of the expansion and contraction of the insulating member on the boss structure can be avoided.

[0025] Preferably, the side wall of the boss extends obliquely from the bottom end to the top end toward the center of the boss; the side wall of the boss forms an angle with the height direction of the cover assembly, and the angle is 3 degrees to 5 degrees; and / or,

[0026] The diameter of the through hole is 14%-47% of the width of the connecting plate; and / or,

[0027] The diameter of the through hole is 6mm-20mm; and / or,

[0028] The diameter of the maximum circumscribed circle of the groove is 14%-47% of the width of the connecting plate; and / or,

[0029] The diameter of the maximum circumscribed circle of the groove is 5.9 mm to 19.9 mm.

[0030] In this technical solution, the sidewalls of the boss are configured to extend obliquely from the bottom to the top toward the center of the boss, that is, the top of the sidewalls of the boss are tightened toward the center relative to the bottom, thereby preventing the boss from being crushed during assembly. Furthermore, by setting a range of values ​​for the angle formed between the sidewalls of the boss and the height direction of the cover assembly, on the one hand, the boss sidewall angle is prevented from being too large, thereby affecting the fit with the second limiter; on the other hand, the boss sidewall angle is prevented from being too small, thereby failing to prevent the boss from being crushed during assembly. By setting a range of values ​​for the diameter of the through hole and the ratio of the through hole diameter to the width of the connecting plate, the hole diameter is prevented from being too large, thereby reducing the heat dissipation area of ​​the connecting plate and the flow area, thereby affecting the heat dissipation effect and battery performance. On the other hand, the hole diameter is prevented from being too small, thereby failing to limit the relative movement between the connecting plate and the insulating member. By setting the value range of the diameter of the maximum circumscribed circle of the groove and the ratio range of the diameter of the maximum circumscribed circle of the groove to the width of the connecting plate, it is avoided that the size of the groove is too large, which will lead to a reduction in the heat dissipation area of ​​the connecting plate and the flow area, thereby affecting the heat dissipation effect and battery performance; and if the size of the groove is too small, it will not have the limiting effect of restricting the relative movement between the connecting plate and the insulating part.

[0031] Preferably, the connecting plate includes a through-portion projection area and a tab connection area, the through-portion projection area includes the projection area of ​​the through-portion on the connecting plate, and the tab connection area includes a connection area connected to a tab led out of the electrode assembly; the number of the tab connection areas in each electrode terminal is two, and the two tab connection areas are symmetrically arranged on both sides of the through-portion;

[0032] The connecting plate also includes a first transition area located between the tab connection area and the through-portion projection area, and a second transition area located between the two tab connection areas. One of the first limiting portion and the second limiting portion is provided on the connecting plate and is provided in the first transition area and / or the second transition area.

[0033] In this technical solution, by arranging one of the first limiting portion and the second limiting portion on the connecting plate in the first transition area and / or the second transition area, the matching position of the first limiting portion and the second limiting portion is prevented from interfering with the tab and the through portion.

[0034] Preferably, the insulating member is provided with a protrusion on one side facing the connecting plate, the protrusion protruding toward the connecting plate, and the orthographic projection of the protrusion along the height direction of the cover plate assembly is located within the outer edge of the connecting plate;

[0035] The number of the protrusions is set corresponding to the number of the tab connection areas, and the orthographic projection of each protrusion along the height direction of the cover plate assembly is at least partially located within the corresponding tab connection area.

[0036] In this technical solution, a protrusion protruding toward the connecting plate is provided on the side of the insulating member facing the connecting plate, that is, the insulating member is thickened. Even if the temperature during welding is high, it can be ensured that the insulating member will not melt through during welding, thereby avoiding the occurrence of short circuits and ensuring the electrical safety of the battery. In addition, the orthographic projection of the protrusion along the height direction of the cover plate assembly is located within the outer edge of the connecting plate, that is, the protrusion is provided within the outer contour of the connecting plate, so that the insulating member is thickened only within the outer contour of the connecting plate, which can improve the overflow of the insulating member caused by melting and deformation. Thus, the normal operation and aesthetics of the internal components of the battery cell are ensured; by setting the number of protrusions to correspond to the number of tab connection areas, the positive projection of each protrusion along the height direction of the cover plate assembly is at least partially located within the corresponding tab connection area, thereby ensuring the stability and reliability of the welding of the connecting plate as a whole to the tab, ensuring that the insulating part will not melt through during the welding process, avoiding the occurrence of short circuit, that is, ensuring the electrical safety of the battery; and improving the overflow of the insulating part due to melting and deformation, thereby ensuring the normal operation and aesthetics of the internal components of the battery cell.

[0037] Preferably, the electrode terminal further includes a first weight-reducing structure, and the first weight-reducing structure is provided in the first transition region and / or the second transition region;

[0038] The first weight-reducing structure is a groove structure, and the groove structure is provided on a side of the connecting plate facing the electrode assembly, or the groove structure is provided on a side of the connecting plate facing the cover plate body.

[0039] In this technical solution, by arranging a first weight-reducing structure in the first transition region and / or the second transition region, that is, by performing weight-reduction processing on the connecting plate, the beneficial technical effect of reducing the overall weight and improving the energy density of the battery is achieved.

[0040] Preferably, the cover plate assembly further comprises a second weight-reducing structure, and the second weight-reducing structure is provided in the first transition area and / or the second transition area;

[0041] The second weight-reducing structure is at least partially adjacent to the first weight-reducing structure; or, the second weight-reducing structure is at least partially overlapped with the first weight-reducing structure; or, the second weight-reducing structure is located in the first weight-reducing structure; or, the second weight-reducing structure and the first weight-reducing structure are spaced apart from each other;

[0042] The second weight-reducing structure penetrates the connecting plate along the height direction of the cover plate assembly;

[0043] The second weight-reducing structure is a weight-reducing through hole, or the second weight-reducing structure is a hollow structure.

[0044] In this technical solution, by setting a second weight-reducing structure in the first transition region and / or the second transition region, that is, by further reducing the weight of the connecting plate, the beneficial technical effect of further reducing the overall weight and improving the energy density of the battery is achieved.

[0045] A single battery, characterized in that it comprises:

[0046] case;

[0047] The cover plate assembly as described above is disposed on the housing and defines a receiving cavity together with the housing;

[0048] The electrode assembly is accommodated in the accommodating cavity.

[0049] The positive progress effect of this utility model is:

[0050] The present invention can avoid the offset of the insulating part during the assembly process by providing a first limiting portion and a second limiting portion that cooperate with each other, thereby improving the accuracy of assembly and the yield of the product; further, by limiting the relationship between the height of the first limiting portion and the height of the second limiting portion, on the one hand, it can avoid the first limiting portion located in the second limiting portion protruding beyond the second limiting portion and interfering with the assembly of nearby components; on the other hand, it can avoid the matching portion of the first limiting portion and the second limiting portion being too short and failing to limit the relative movement between the connecting plate and the insulating part. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of the three-dimensional structure of the cover assembly of Example 1 of the present utility model.

[0052] Figure 2 This is a schematic diagram of the three-dimensional exploded structure of the cover plate assembly of Example 1 of the present utility model.

[0053] Figure 3 This is a bottom view structural diagram of the cover plate assembly of Example 1 of the present utility model.

[0054] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along the AA direction.

[0055] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of part B.

[0056] Figure 6 This is a schematic diagram of a partial bottom view of the cover assembly of Example 1 of the present utility model.

[0057] Figure 7 This is a schematic diagram of the three-dimensional structure of the electrode terminal of the cover plate assembly of Example 1 of the present utility model.

[0058] Figure 8 This is a bottom view structural diagram of the electrode terminal of the cover plate assembly of Example 1 of the present utility model.

[0059] Figure 9 This is a schematic diagram of the three-dimensional structure of the cover assembly of Example 2 of the present utility model.

[0060] Description of Reference Numerals

[0061] Cover assembly 1

[0062] Electrode terminal 10

[0063] Through portion 11

[0064] Connecting plate 12

[0065] Through-portion projection area 121

[0066] Tab connection area 122

[0067] First transition region 123

[0068] Second transition region 124

[0069] Cover body 20

[0070] Pole through hole 21

[0071] Liquid injection hole 23

[0072] Insulation 30

[0073] Insulation through hole 31

[0074] Protrusion 32

[0075] Part 1 321

[0076] Part II 322

[0077] The first strip protrusion 323

[0078] Second strip protrusion 324

[0079] Insulation layer 40

[0080] The first limiting portion 51

[0081] The second limiting portion 52

[0082] First weight reduction structure 61

[0083] Second weight reduction structure 62

[0084] Length direction L of the cover assembly

[0085] Width direction W of the cover assembly

[0086] Height direction H of the cover assembly

[0087] The height h1 of the first limiting portion

[0088] The height h2 of the second limiting portion DETAILED DESCRIPTION

[0089] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0090] Example 1

[0091] This embodiment provides a cover plate assembly and a single battery cell including the same. The single battery cell includes a housing, the cover plate assembly, and an electrode assembly. The cover plate assembly is disposed on the housing and, together with the housing, defines a receiving cavity. The electrode assembly is received in the receiving cavity.

[0092] like Figures 1 to 6 As shown, the cap assembly 1 includes: an electrode terminal 10, a cap body 20, an insulating member 30, and a first limiting portion 51 and a second limiting portion 52. The cap body 20 has a pole through hole 21 therethrough.

[0093] The electrode terminal 10 includes a connected through-portion 11 and a connecting plate 12. The through-portion 11 at least partially extends through the terminal post through-hole 21. The connecting plate 12 is located on the side of the cover body 20 facing the electrode assembly. It should be noted that the through-portion 11 passes through the terminal post through-hole 21 of the cover body 20, thereby electrically connecting the electrode tab to an electrical connection component located outside the cover body 20. The through-portion 11 is typically cylindrical.

[0094] The insulating member 30 covers a side of the cover body 20 facing the electrode assembly and is located between the cover body 20 and the connecting plate 12 .

[0095] One of the first limiting portion 51 and the second limiting portion 52 is arranged on the side of the insulating member 30 facing the electrode assembly, and the other is arranged on the side of the connecting plate 12 facing the insulating member 30. The first limiting portion 51 and the second limiting portion 52 cooperate to limit the relative movement between the connecting plate 12 and the insulating member 30.

[0096] The first limiting portion 51 extends into the second limiting portion 52 , and along the height direction H of the cover assembly 1 , the height h1 of the first limiting portion 51 is greater than or equal to one third of the height h2 of the second limiting portion 52 and less than the height h2 of the second limiting portion 52 .

[0097] In this way, by providing the mutually cooperating first limiting portion 51 and second limiting portion 52, it is possible to prevent the insulating member 30 from shifting during the assembly process, thereby improving assembly accuracy and product yield. Furthermore, by limiting the relationship between the height h1 of the first limiting portion 51 and the height h2 of the second limiting portion 52, on the one hand, the first limiting portion 51 located within the second limiting portion 52 is prevented from protruding beyond the second limiting portion 52 and interfering with the assembly of nearby components. On the other hand, it is possible to prevent the mating portion of the first limiting portion 51 and the second limiting portion 52 from being too short, thereby failing to restrict relative movement between the connecting plate 12 and the insulating member 30. It should be noted that the height direction H of the cover plate assembly 1 is also the thickness direction of the cover plate assembly 1.

[0098] In this embodiment, a portion of the insulating member 30 on the side facing the electrode assembly protrudes toward the electrode assembly to form a first limiting portion 51, and a portion of the connecting plate 12 on the side facing the insulating member 30 is recessed away from the insulating member 30 to form a second limiting portion 52. However, this is not limiting. In other embodiments, a portion of the insulating member 30 on the side facing the electrode assembly may be recessed away from the electrode assembly to form the second limiting portion, and a portion of the connecting plate 12 on the side facing the insulating member 30 may protrude toward the insulating member 30 to form the first limiting portion. Thus, through the above arrangement, a specific arrangement of the first limiting portion 51 and the second limiting portion 52 is provided, which can achieve a more effective limitation on the relative movement between the connecting plate 12 and the insulating member 30.

[0099] Preferably, the first limiting portion 51 and the second limiting portion 52 are engaged with each other, so as to better limit the relative movement between the connecting plate 12 and the insulating member 30 .

[0100] Specifically, the first limiting portion 51 is a boss, and the second limiting portion 52 is a through hole. As previously described, along the height direction H of the cover assembly 1, the height h1 of the first limiting portion 51 is greater than or equal to one-third of the height h2 of the second limiting portion 52, and less than the height h2 of the second limiting portion 52. That is, along the height direction H of the cover assembly 1, the height of the boss is greater than or equal to one-third of the height (i.e., the depth) of the through hole, and less than the height (i.e., the depth) of the through hole.

[0101] However, the present invention is not limited thereto. In other embodiments, the second limiting portion 52 may also be a groove. The first limiting portion 51 and the second limiting portion 52 may also be other structures capable of limiting the relative movement between the connecting plate 12 and the insulating member 30 .

[0102] The number of first limiting portions 51 and second limiting portions 52 corresponds to each other, and both have at least one. In this embodiment, there are two electrode terminals 10, and both electrode terminals 10 are provided with one second limiting portion 52, that is, the number of second limiting portions 52 is two. However, this is not limiting. Alternatively, one of the two electrode terminals 10 may be provided with a second limiting portion 52, or both electrode terminals 10 may be provided with multiple second limiting portions 52. The number of second limiting portions 52 provided on each electrode terminal 10 may be the same or different.

[0103] Preferably, the boss is an annular structure. Thus, by setting the boss as an annular structure, that is, the middle area of ​​the boss is hollowed out, the weight of the boss can be reduced, thereby reducing the overall weight of the insulating member 30 while maintaining the structural strength of the boss.

[0104] Furthermore, the boss of the ring structure is a circular boss to facilitate manufacturing. However, the ring structure boss can also be an elliptical boss, with the major axis of the elliptical boss corresponding to the width direction of the cover assembly 1. Thus, by setting the ring structure boss as an elliptical boss, with the major axis of the elliptical boss corresponding to the width direction W of the cover assembly 1, and correspondingly, the minor axis of the elliptical boss corresponding to the length direction L of the cover assembly 1, the relative movement between the connecting plate 12 and the insulating member 30 can be better limited, and the effect of the expansion and contraction of the insulating member 30 on the boss structure can be avoided. Alternatively, the boss can be a runway-shaped boss, with the long side of the runway-shaped boss corresponding to the width direction of the cover assembly 1. Thus, by setting the ring structure boss as a runway-shaped boss, with the long side of the runway-shaped boss corresponding to the width direction of the cover assembly 1, the relative movement between the connecting plate 12 and the insulating member 30 can be better limited, and the effect of the expansion and contraction of the insulating member 30 on the boss structure can be avoided.

[0105] Please refer back to Figure 2 In this embodiment, the Figure 2 The boss of the ring structure on the left side of the middle insulator 30 is a circular boss; Figure 2 The boss of the ring-shaped structure on the right side of the middle insulating member 30 is a racetrack-shaped boss.

[0106] Please refer back to Figure 5 Preferably, the sidewalls of the boss extend obliquely toward the center of the boss from the bottom to the top. That is, the top of the boss's sidewalls is tightened toward the center relative to the bottom, thereby preventing damage to the boss during assembly. The bottom of the boss refers to the end of the boss connected to the insulating member 30, and the top of the boss refers to the free end of the boss.

[0107] Furthermore, the sidewall of the boss forms an angle α with the height direction H of the cover assembly 1, and the angle α is between 3 and 5 degrees. Thus, by setting a range of values ​​for the angle α formed by the sidewall of the boss and the height direction H of the cover assembly 1, on the one hand, the boss sidewall is prevented from being tilted too much, thereby affecting the fit with the second stopper 52; on the other hand, the boss sidewall is prevented from being tilted too little, thereby failing to prevent the boss from being crushed during assembly.

[0108] Specifically, the diameter of the through hole is 14%-47% of the width of the connecting plate. The diameter of the through hole is 6mm-20mm. By setting the range of values ​​for the through hole diameter and the ratio of the through hole diameter to the width of the connecting plate, it is possible to avoid an excessively large hole diameter, which would reduce the heat dissipation area of ​​the connecting plate and the flow area, thereby affecting the heat dissipation effect and battery performance. On the other hand, an excessively small hole diameter would fail to limit the relative movement between the connecting plate and the insulating member. The width of the connecting plate 12 refers to the dimension of the connecting plate 12 along the width direction W of the cover plate assembly 1.

[0109] In other embodiments, when the second limiting portion 52 is a groove, the diameter of the maximum circumscribed circle of the groove is 14%-47% of the width of the connecting plate. The diameter of the maximum circumscribed circle of the groove is 5.9mm-19.9mm. By setting the value range of the diameter of the maximum circumscribed circle of the groove and the ratio range of the diameter of the maximum circumscribed circle of the groove to the width of the connecting plate, it is avoided that the size of the groove is too large, which leads to a reduction in the heat dissipation area of ​​the connecting plate and a reduction in the flow area, thereby affecting the heat dissipation effect and battery performance; and if the size of the groove is too small, it will not have the limiting effect of limiting the relative movement between the connecting plate and the insulating member. It should be noted that the shape of the groove can be a circle, an ellipse, a rectangle, or a polygon, and the diameter of the maximum circumscribed circle of these shapes is the maximum size of the different angles of these shapes.

[0110] like Figure 7 and Figure 8 As shown, in this embodiment, the connecting plate 12 includes a through-portion projection area 121 and a tab connection area 122. The through-portion projection area 121 includes the projection area of ​​the through-portion 11 on the connecting plate 12, and the tab connection area 122 includes the connection area for connecting to the tabs extending from the electrode assembly. There are two tab connection areas 122 in each electrode terminal 10, and the two tab connection areas 122 are symmetrically arranged on both sides of the through-portion 11.

[0111] The connecting plate 12 further includes a first transition region 123 located between the tab connection region 122 and the through-portion projection region 121 , and a second transition region 124 located between the two tab connection regions.

[0112] The second limiting portion 52 is provided in the second transition region 124 to prevent the mating position of the first limiting portion 51 and the second limiting portion 52 from interfering with the tab and the through portion. At the same time, the location of the second limiting portion 52 must also avoid interference with other components. For example, in this embodiment, a liquid injection hole 23 is provided on the cover body, and the outer wall of the liquid injection hole 23 protrudes outward toward the insulating member 30. In this embodiment, since the second limiting portion 52 is a boss with an annular structure, the liquid injection hole 23 can be provided within the annular structure, so that the annular structure surrounds the outer wall of the protruding liquid injection hole 23 within it, thereby avoiding interference between the two. However, the present invention is not limited thereto, and the second limiting portion 52 can also be provided at a distance from the liquid injection hole 23.

[0113] However, the present invention is not limited thereto. In other embodiments, the second limiting portion 52 may also be provided in the first transition region 123 , or may be provided in both the second transition region 124 and the first transition region 123 , and may be adjusted according to design requirements.

[0114] In addition, as mentioned above, along the height direction H of the cover assembly 1, the height h1 of the first limiting portion 51 is greater than or equal to one third of the height h2 of the second limiting portion 52, and is less than the height h2 of the second limiting portion 52. Since the second limiting portion 52 is arranged in the second transition area 124, that is, along the height direction H of the cover assembly 1, the height h2 of the second limiting portion 52 is equal to the height of the second transition area 124 where the second limiting portion 52 is set, that is, the height of the through hole (that is, the depth of the through hole) is equal to the height of the second transition area 124.

[0115] A protrusion 32 is provided on the side of the insulating member 30 facing the connecting plate 12, protruding toward the connecting plate 12. The orthographic projection of the protrusion 32 along the height direction H of the cover plate assembly 1 is located within the outer edge of the connecting plate 12. Thus, by providing the protrusion 32 on the side of the insulating member 30 facing the connecting plate 12, the insulating member 30 is thickened. This prevents the insulating member 30 from melting through during welding, even at high temperatures, thereby avoiding short circuits and ensuring the electrical safety of the battery. Furthermore, by locating the orthographic projection of the protrusion 32 along the height direction H of the cover plate assembly 1 within the outer edge of the connecting plate 12, i.e., by arranging the protrusion 32 within the outer contour of the connecting plate 12, the insulating member 30 is thickened only within the outer contour of the connecting plate 12. This reduces the risk of overflow of the insulating member 30 due to melting and deformation, thereby ensuring the normal operation and aesthetics of the internal components of the battery cell.

[0116] The number of raised portions 32 corresponds to the number of tab connection areas 122, and the orthographic projection of each raised portion 32 along the height direction H of the cover plate assembly 1 is at least partially located within the corresponding tab connection area 122. Thus, by setting the number of raised portions 32 to correspond to the number of tab connection areas 122, the orthographic projection of each raised portion 32 along the height direction H of the cover plate assembly 1 is at least partially located within the corresponding tab connection area 122. This ensures the smoothness and reliability of the welding of the connecting plate 12 to the tabs, prevents the insulating member 30 from melting through during the welding process, and avoids the occurrence of a short circuit, thus ensuring the electrical safety of the battery. Furthermore, the overflow of the insulating member 30 due to melting and deformation is reduced, thereby ensuring the normal operation and aesthetics of the internal components of the battery cell.

[0117] In this embodiment, as described above, each electrode terminal 10 includes two tab connection regions 122, which are symmetrically disposed on either side of the through portion 11. Correspondingly, there are also two protrusions 32, which are disposed corresponding to the two tab connection regions 122, respectively.

[0118] For further information, please refer to Figure 6 The distance d between the orthographic projection of the protrusion 32 along the height direction H of the cover assembly 1 and the outer edge of the connecting plate 12 is greater than 0.5 mm. Thus, by setting a minimum value range for the distance d between the orthographic projection of the protrusion 32 along the height direction H of the cover assembly 1 and the outer edge of the connecting plate 12, it is ensured that even if the protrusion 32 is melted and deformed, it will not overflow the outer contour of the connecting plate 12. It should be noted that Figure 6 In order to more clearly show the distance d between the orthographic projection of the protrusion 32 along the height direction H of the cover plate assembly 1 and the outer edge of the connecting plate 12, the specific structure of the protrusion 32 blocked by the connecting plate 12 is indicated by a dotted line.

[0119] Specifically, each protrusion 32 includes a first portion 321 and a second portion 322 connected to each other. The orthographic projection of the first portion 321 along the height direction H of the cap plate assembly 1 is located within the corresponding tab connection area 122, while the orthographic projection of the second portion 322 along the height direction H of the cap plate assembly 1 is located within the first transition area 123 and the second transition area 124. Thus, by configuring the protrusion 32 to include the first portion 321 and the second portion 322, the protrusion 32 can span the tab connection area 122 and the first and second transition areas 123 and 124 on the connecting plate 12, thereby increasing the contact area between the connecting plate 12 and the protrusion 32. This ensures smooth and reliable welding between the connecting plate 12 and the tab while preventing the insulating member 30 from melting through during welding, thus avoiding short circuits and thus ensuring the electrical safety of the battery. Furthermore, the protrusion 32 can mitigate the risk of overflow caused by melting and deformation of the insulating member 30, thereby ensuring the normal operation and aesthetics of the internal components of the battery cell. In other embodiments, the protrusion 32 may also only include a first portion 321 whose orthographic projection along the height direction H of the cover plate assembly 1 is located within the corresponding tab connection area 122 to ensure that the melting of the protrusion 32 caused by the high welding temperature is reduced.

[0120] Preferably, the first distance d1 between the orthographic projection of the first portion 321 along the height direction H of the cover plate assembly 1 and the outer peripheral edge of the corresponding tab connection area 122 is greater than 0.5 mm. Thus, by setting a minimum value range for the first distance d1 between the orthographic projection of the first portion 321 along the height direction H of the cover plate assembly 1 and the outer edge of the tab connection area 122 of the connecting plate 12, it is ensured that even if the first portion 321 of the protrusion 32 is melted and deformed, it will not overflow the outer contour of the tab connection area 122 of the connecting plate 12. It should be noted that the outer peripheral edge of the tab connection area 122 refers to the edge of the tab connection area 122 that is not connected to the first transition area 123 and the second transition area 124 and forms the outer contour of the connecting plate 12.

[0121] Preferably, the second distance d2 between the orthographic projection of the second portion 322 along the height direction H of the cover plate assembly 1 and the outer peripheral edge of the first transition region 123 is greater than 0.5 mm. Thus, by setting a minimum value range for the second distance d2 between the orthographic projection of the second portion 322 along the height direction H of the cover plate assembly 1 and the outer edge of the first transition region 123 of the connecting plate 12, it is ensured that even if the second portion 322 of the protrusion 32 is melted and deformed, it will not overflow the outer contour of the first transition region 123 of the connecting plate 12. The outer peripheral edge of the first transition region 123 refers to the edge of the first transition region 123 that is not connected to the two tab connection regions 122 and the through-portion projection region 121, and that forms the outer contour of the connecting plate 12.

[0122] It should be noted that Figure 6 In order to more clearly show the first distance d1 between the orthographic projection of the first part 321 along the height direction H of the cover plate assembly 1 and the outer peripheral edge of the corresponding tab connection area 122, and the second distance d2 between the orthographic projection of the second part 322 along the height direction H of the cover plate assembly 1 and the outer peripheral edge of the first transition area 123, the specific structure of the protrusion 32 blocked by the connecting plate 12 is marked with a dotted line.

[0123] Specifically, in this embodiment, the raised portion 32 has a grid structure. Furthermore, the raised portion 32 includes a plurality of first protrusions 323 extending along the length direction L of the cover plate assembly 1, and a plurality of second protrusions 324 extending along the width direction W of the cover plate assembly 1. The first protrusions 323 and the second protrusions 324 are arranged in an alternating pattern. This specific grid structure of the raised portion 32 facilitates processing of the raised portion 32. Furthermore, the first protrusions 323 extend along the length direction L of the cover plate assembly 1, while the second protrusions 324 extend along the width direction W of the cover plate assembly 1. Thus, the first protrusions 323 and the second protrusions 324 are arranged perpendicularly to each other, thereby enhancing the overall support strength of the raised portion 32.

[0124] However, the present invention is not limited thereto. In other embodiments, the raised portion 32 may be a frame-shaped structure; or, the raised portion 32 may include a plurality of columnar protrusions arranged in an array; or, the raised portion 32 may include a plurality of strip-shaped protrusions extending in the same direction and arranged at intervals.

[0125] In this embodiment, a thermal insulation layer 40 is provided between the raised portion 32 and the connecting plate 12. The thermal insulation layer 40 covers the surface of the raised portion 32, and the thermal insulation layer 40 covers the raised portion 32 along the orthographic projection H of the cover plate assembly 1. Thus, by covering the surface of the raised portion 32 with the thermal insulation layer 40, the beneficial technical effect of heat insulation is achieved, thereby mitigating the melting of the raised portion 32 caused by the high welding temperature. Furthermore, the thermal insulation layer 40 can be attached to the surface of the raised portion 32, or the thermal insulation layer 40 can be applied to the surface of the raised portion 32.

[0126] Preferably, the electrode terminal 10 further includes a first weight-reducing structure 61, disposed within the first transition region 123. The first weight-reducing structure 61 is a groove structure, located on the side of the connecting plate 12 facing the electrode assembly. That is, along the height direction H of the cap plate assembly 1 (i.e., the thickness direction of the cap plate assembly 1), the groove structure is recessed away from the electrode assembly. Thus, by providing the first weight-reducing structure 61 in the first transition region 123 between the tab connection region 122 and the through-portion projection region 121, the connecting plate 12 is weight-reduced, thereby achieving the beneficial technical effect of reducing overall weight and increasing the energy density of the battery. However, this is not limiting. In other embodiments, the groove structure may also be located on the side of the connecting plate 12 facing the cap plate body 20. That is, along the height direction H of the cap plate assembly 1, the groove structure is recessed toward the electrode assembly. In other embodiments, the first weight-reducing structure 61 may also be located in the second transition region 124, or in both the first transition region 123 and the second transition region 124.

[0127] The number of the first weight-reducing structures 61 can be one or more. In the present embodiment, the number of the first weight-reducing structures 61 is two, and the two first weight-reducing structures 61 are symmetrically arranged on both sides of the through-portion 11 corresponding to the tab connection area 122. However, it is not limited thereto. In other embodiments, the first weight-reducing structure 61 can also be arranged between the two tab connection areas 122 and symmetrically arranged about the through-portion 11. By arranging the first weight-reducing structure 61 symmetrically about the through-portion 11, the weight of the connecting plate 12 is symmetrically reduced, thereby achieving the maximum weight reduction of the connecting plate 12 while maintaining the structural balance of the connecting plate 12. In other embodiments, the number of the first weight-reducing structures 61 can also be one, three, four, or other values, which can be adjusted accordingly as needed.

[0128] In this embodiment, the first weight reducing structure 61 abuts against the outer edges of both adjacent sides of the connecting plate 12. The first weight reducing structure 61 includes a bottom wall, and a first side wall and a second side wall connected to the top of the bottom wall. The first side wall and the second side wall are adjacent, and the extension directions of the first side wall and the second side wall form an angle. The side of the first side wall away from the second side wall abuts against the outer edge of one of the two adjacent sides of the connecting plate 12, and the side of the second side wall away from the first side wall abuts against the outer edge of the other of the two adjacent sides of the connecting plate 12.

[0129] Specifically, the first weight-reducing structure 61 may be formed by an upsetting process, but is not limited thereto. The first weight-reducing structure 61 may also be formed by a slotting process.

[0130] Furthermore, the cover plate assembly 1 also includes a second weight-reducing structure 62, which is disposed in the first transition region 123; the second weight-reducing structure 62 is located within the first weight-reducing structure 61. Thus, by providing the second weight-reducing structure 62 in the transition region 122, i.e., by further reducing the weight of the connecting plate 12, the beneficial technical effects of further reducing the overall weight and increasing the energy density of the battery are achieved.

[0131] However, the present invention is not limited to this. In other embodiments, the second weight-reducing structure 62 may be at least partially adjacent to the first weight-reducing structure 61; or the second weight-reducing structure 62 may at least partially overlap with the first weight-reducing structure 61; or the second weight-reducing structure 62 and the first weight-reducing structure 61 may be spaced apart from each other. The second weight-reducing structure 62 may be adjusted relative to the first weight-reducing structure 61 according to design requirements. In other embodiments, the second weight-reducing structure 62 may be disposed in the second transition region 124, or in both the first transition region 123 and the second transition region 124.

[0132] Specifically, the second weight-reducing structure 62 extends through the connecting plate 12 along the height direction H of the cover plate assembly 1. The second weight-reducing structure 62 is a hollow structure. The second weight-reducing structure 62 abuts against the outer edge of at least one side of the connecting plate 12, thereby forming a hollow structure. However, this is not limiting. In other embodiments, the second weight-reducing structure 62 may be a weight-reducing through hole.

[0133] In this embodiment, both the first weight-reducing structure 61 and the second weight-reducing structure 62 are provided. However, this is not limiting. In other embodiments, only the first weight-reducing structure 61 or only the second weight-reducing structure 62 may be provided. Furthermore, different numbers of first weight-reducing structures 61 or different numbers of second weight-reducing structures 62 may be provided, and both can be adjusted according to design requirements.

[0134] In this embodiment, the insulating member 30 is made of plastic, but is not limited thereto and may be made of other insulating materials. The insulating member 30 has an insulating through-hole 31 positioned corresponding to the electrode through-hole 21. The through-hole 11 of the electrode terminal 10 extends through the electrode through-hole 21 and the insulating through-hole 31, respectively. The diameter of the insulating through-hole 31 is larger than that of the electrode through-hole 21. A seal is provided on the side of the electrode through-hole 21 facing the electrode assembly. The seal is sandwiched between the electrode terminal 10 and the cover body 20 and located within the insulating through-hole 31.

[0135] In this embodiment, the electrode terminal 10 is integrally formed, that is, the through portion 11 and the connecting plate 12 are integrally formed. By providing the through portion 11 and the connecting plate 12 as an integral part, the connection strength between the through portion 11 and the connecting plate 12 is enhanced.

[0136] When the electrode terminal 10 is a negative electrode, the through-portion 11 is made of aluminum, and the connecting plate 12 is made of copper. Typically, the external connection end of the cap plate assembly 1 is made of aluminum, while the tab corresponding to the negative electrode terminal 10 is made of copper. By making the through-portion 11 of the negative electrode terminal 10 aluminum and the connecting plate 12 copper, the through-portion 11 and the external connection end of the cap plate assembly 1 are made of the same metal, and the connecting plate 12 and the tab are made of the same metal, thereby improving the reliability of the electrical connection within the cap plate assembly 1 and between the cap plate assembly 1 and the external structure.

[0137] In this embodiment, the cover plate assembly 1 further includes an external conductive member (not shown). The end of the through-portion 11, distal from the connection plate 12, passes through the electrode through-hole 21 and is electrically connected to the external conductive member. Thus, the provision of the external conductive member enables electrical connection between the electrode terminal 10 and the external connection end of the cover plate assembly 1. Furthermore, the provision of the external conductive member independently of the electrode terminal 10 facilitates assembly of the cover plate assembly 1.

[0138] This embodiment prevents the insulating member 30 from being offset during the assembly process by providing a first limiting portion 51 and a second limiting portion 52 that cooperate with each other, thereby improving the assembly accuracy and the yield rate of the product. Furthermore, by limiting the relationship between the height h1 of the first limiting portion 51 and the height h2 of the second limiting portion 52, on the one hand, it prevents the first limiting portion 51 located in the second limiting portion 52 from protruding beyond the second limiting portion 52 and interfering with the assembly of nearby components. On the other hand, it prevents the matching portion of the first limiting portion 51 and the second limiting portion 52 from being too short and failing to limit the relative movement between the connecting plate 12 and the insulating member 30.

[0139] Example 2

[0140] like Figure 9 As shown, the overall structure of the cover plate assembly 1 and the single battery cell containing the same in this embodiment is basically the same as that in embodiment 1, except that the number of the first limiting portions 51 and the number of the second limiting portions 52 are both four.

[0141] As described in Example 1, there are two electrode terminals 10. The four second limiting portions 52 are divided into two groups, each group of second limiting portions 52 has two second limiting portions 52, and each electrode terminal 10 is provided with a group of second limiting portions 52. The two second limiting portions 52 in a group are spaced apart along the length direction of the electrode assembly. In this embodiment, by providing four pairs of first limiting portions 51 and second limiting portions 52 and evenly distributing the four pairs of first limiting portions 51 and second limiting portions 52, it is possible to better limit the relative movement between the connecting plate 12 and the insulating member 30 without weakening the structural strength of the connecting plate 12 itself, thereby better preventing the insulating member 30 from offsetting during the assembly process, thereby improving the assembly accuracy and the product yield.

[0142] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A cover plate assembly, characterized in that: It includes: The cover plate body has a through-hole for the pole; an electrode terminal, the electrode terminal comprising a through-portion and a connecting plate connected to each other, the through-portion at least partially passing through the electrode through-hole, and the connecting plate being located on a side of the cover body facing the electrode assembly; an insulating member, the insulating member covering a side of the cover plate body facing the electrode assembly and located between the cover plate body and the connecting plate; a first limiting portion and a second limiting portion, wherein one of the first limiting portion and the second limiting portion is provided on a side of the insulating member facing the electrode assembly, and the other is provided on a side of the connecting plate facing the insulating member, The first limiting portion extends into the second limiting portion, and along the height direction of the cover assembly, the height of the first limiting portion is greater than or equal to one third of the height of the second limiting portion and less than the height of the second limiting portion.

2. The cover plate assembly according to claim 1, wherein: A portion of the insulating member on a side facing the electrode assembly protrudes toward the electrode assembly to form the first limiting portion, and a portion of the connecting plate on a side facing the insulating member is recessed toward a direction away from the insulating member to form the second limiting portion; or A partial area on the side of the insulating member facing the electrode assembly is recessed away from the electrode assembly to form the second limiting portion, and a partial area on the side of the connecting plate facing the insulating member protrudes toward the insulating member to form the first limiting portion.

3. The cover plate assembly according to claim 2, wherein: The first limiting portion is engaged with the second limiting portion; the first limiting portion is a boss, and the second limiting portion is a through hole or a groove; and / or, The number of the first limiting parts corresponds to the number of the second limiting parts, and there is at least one of each.

4. The cover plate assembly according to claim 3, wherein: The boss is a ring-shaped structure.

5. The cover plate assembly according to claim 4, wherein: The boss is a circular boss; or The boss is an elliptical boss, and the long axis direction of the elliptical boss corresponds to the width direction of the cover assembly; or, The boss is a runway-shaped boss, and the long side direction of the runway-shaped boss is arranged to correspond to the width direction of the cover plate assembly.

6. The cover plate assembly according to claim 3, wherein: The side wall of the boss extends obliquely from the bottom end to the top end toward the center of the boss; the side wall of the boss forms an angle with the height direction of the cover assembly, and the angle is 3 degrees to 5 degrees; and / or, The diameter of the through hole is 14%-47% of the width of the connecting plate; and / or, The diameter of the through hole is 6mm-20mm; and / or, The diameter of the maximum circumscribed circle of the groove is 14%-47% of the width of the connecting plate; and / or, The diameter of the maximum circumscribed circle of the groove is 5.9 mm to 19.9 mm.

7. The cover plate assembly according to claim 1, wherein: The connecting plate includes a through-portion projection area and a tab connection area, wherein the through-portion projection area includes the projection area of ​​the through-portion on the connecting plate, and the tab connection area includes the connection area connected to the tab led out of the electrode assembly; the number of the tab connection areas in each electrode terminal is two, and the two tab connection areas are symmetrically arranged on both sides of the through-portion; The connecting plate also includes a first transition area located between the tab connection area and the through-portion projection area, and a second transition area located between the two tab connection areas. One of the first limiting portion and the second limiting portion is provided on the connecting plate and is provided in the first transition area and / or the second transition area.

8. The cover plate assembly according to claim 7, wherein: The insulating member is provided with a protrusion on one side facing the connecting plate, the protrusion protruding toward the connecting plate, and the orthographic projection of the protrusion along the height direction of the cover plate assembly is located inside the outer edge of the connecting plate; The number of the protrusions is set corresponding to the number of the tab connection areas, and the orthographic projection of each protrusion along the height direction of the cover plate assembly is at least partially located within the corresponding tab connection area.

9. The cover plate assembly according to claim 7, wherein: The electrode terminal further includes a first weight-reducing structure, and the first weight-reducing structure is provided in the first transition region and / or the second transition region; The first weight-reducing structure is a groove structure, and the groove structure is provided on a side of the connecting plate facing the electrode assembly, or the groove structure is provided on a side of the connecting plate facing the cover plate body.

10. The cover plate assembly according to claim 9, wherein: The cover plate assembly further includes a second weight-reducing structure, wherein the second weight-reducing structure is provided in the first transition region and / or the second transition region; The second weight-reducing structure is at least partially adjacent to the first weight-reducing structure; Alternatively, the second weight-reducing structure at least partially overlaps with the first weight-reducing structure; Alternatively, the second weight-reducing structure is located in the first weight-reducing structure; or, the second weight-reducing structure and the first weight-reducing structure are spaced apart from each other; The second weight-reducing structure penetrates the connecting plate along the height direction of the connecting plate; The second weight-reducing structure is a weight-reducing through hole, or the second weight-reducing structure is a hollow structure.

11. A single battery, characterized in that: It includes: case; The cover plate assembly according to any one of claims 1 to 10, wherein the cover plate assembly is disposed on the housing and defines a receiving cavity together with the housing; The electrode assembly is accommodated in the accommodating cavity.

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