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 which is provided with a post terminal through hole and a liquid injection hole which penetrate along the height direction of the cover plate assembly; the insulating part covers one side, facing the electrode assembly, of the cover plate body, and a first through hole is formed in the position, corresponding to the liquid injection hole of the cover plate body, of the insulating part; the electrode terminal comprises a penetrating part and a connecting plate which are connected, the penetrating part penetrates through the pole through hole of the cover plate body, the connecting plate is located on the side, facing the electrode assembly, of the cover plate body, the insulating part is located between the cover plate body and the connecting plate, and a second through hole is formed in the position, corresponding to the first through hole, of the connecting plate; a partial area of one side, facing the electrode assembly, of the connecting plate is recessed to form a liquid guide groove, the liquid guide groove is communicated with the second through hole and the outer periphery of the connecting plate, and the depth of the liquid guide groove is smaller than the thickness of the connecting plate in the height direction of the cover plate assembly. And a liquid guide channel is formed by arranging the liquid guide groove, so that normal electrolyte injection is ensured.

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] Currently, in the structure of prismatic batteries, the general prismatic top cover solution without an adapter plate uses a large base plate electrode terminal (electrode). The electrode assembly is welded to both sides of the base plate via tabs. The base plate of this positive electrode terminal covers the injection hole. By opening holes in the insulating member and the base plate at the corresponding positions of the injection hole, the injection hole is prevented from being affected. In this way, a connected structure is formed with the base plate opening, the insulating member opening, and the injection hole.

[0003] This connecting structure has no effect when the length of the tab does not interfere with the injection hole. If the tab is too long and the tabs on both sides block part or all of the injection hole, when injecting liquid, the negative pressure will cause the tab to be tightly sucked onto the bottom plate, thus affecting the injection. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defect in the prior art that the excessively long tab blocks the liquid injection hole, thereby affecting the liquid injection, and 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 pole through hole and a liquid injection hole penetrating along the height direction of the cover plate assembly;

[0008] an insulating member, the insulating member being covered on a side of the cover plate body facing the electrode assembly, the insulating member being provided with a first through hole corresponding to the injection hole;

[0009] An electrode terminal, wherein the electrode terminal includes a through-portion and a connecting plate connected to each other, the through-portion at least partially passing through the pole through-hole, the connecting plate being located on the side of the cover plate body facing the electrode assembly, and the insulating member being located between the cover plate body and the connecting plate, the connecting plate being provided with a second through-hole corresponding to the position of the first through-hole, a partial area of the connecting plate on the side facing the electrode assembly being recessed in a direction away from the electrode assembly to form a liquid guide groove, the liquid guide groove being connected to the second through-hole and the outer periphery of the connecting plate, and the depth of the liquid guide groove along the height direction of the cover plate assembly is less than the thickness of the connecting plate.

[0010] In this technical solution, a liquid-conducting channel is formed by providing a liquid-conducting groove connecting the second through-hole and the outer periphery of the connecting plate. Even when the tab is tightly attached to the connecting plate, electrolyte can still flow out of the liquid-conducting channel, thereby ensuring normal electrolyte injection. Furthermore, by ensuring that the depth of the liquid-conducting groove along the height of the cover plate assembly is less than the thickness of the connecting plate, i.e., by providing a solid structure at the location of the liquid-conducting groove, the connection strength of the connecting plate itself can be ensured.

[0011] Preferably, the insulating member includes a venting area corresponding to the explosion-proof valve, and on a side of the insulating member close to the electrode assembly, the venting area protrudes toward the electrode assembly; and / or,

[0012] Along the height direction of the cover plate assembly, the depth of the liquid guide groove is greater than or equal to one third of the thickness of the connecting plate and less than the thickness of the connecting plate; and / or,

[0013] One end of the liquid guiding groove close to the second through hole is arranged around the outer periphery of the second through hole.

[0014] In the present technical solution, by arranging the exhaust area on the side of the insulating part close to the electrode assembly and protruding in the direction close to the electrode assembly, it is possible to prevent the electrolyte from flowing from the exhaust area to the explosion-proof valve and affecting the normal operation of the explosion-proof valve. By setting the value range of the depth of the liquid guide groove, while ensuring the better connection strength of the connecting plate, it is ensured that the electrolyte is normally injected into the liquid guide channel formed by the liquid guide groove. By arranging the end of the liquid guide groove close to the second through hole around the outer periphery of the second through hole, that is, expanding the space that can accommodate the electrolyte at the end of the liquid guide groove close to the second through hole, it can better play the role of diversion and drainage.

[0015] Preferably, the first limiting portion and the second limiting portion, one of the first limiting portion and the second limiting portion is arranged on the side of the insulating part facing the electrode assembly, and the other is arranged on the side of the connecting plate facing the insulating part, the first limiting portion extends into the second limiting portion, and along the height direction of the cover plate 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 is less than the height of the second limiting portion.

[0016] 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.

[0017] 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,

[0018] 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.

[0019] 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.

[0020] 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,

[0021] The number of the first limiting parts corresponds to the number of the second limiting parts, and there is at least one of each.

[0022] In the present technical solution, the above-mentioned configuration provides a specific configuration method of the first limiting portion and the second limiting portion.

[0023] Preferably, one of the first limiting parts is a boss provided on the insulating member, and the boss is provided around the first through hole; and one of the second limiting parts is the second through hole provided on the connecting plate.

[0024] In the present technical solution, by making one of the first limiting parts a boss provided on the insulating part, the boss provided around the first through hole, and one of the second limiting parts a second through hole provided on the connecting plate, the second limiting part and the second through hole can be effectively combined together, thereby simplifying the overall structure.

[0025] Preferably, the number of the liquid-conducting groove is one, and the plane where the bottom wall of the liquid-conducting groove is located is in the same plane as the end surface of the boss away from the insulating member; or,

[0026] There are multiple liquid guide grooves, and the multiple liquid guide grooves are connected in sequence from the second through hole to the outer periphery of the connecting plate. The depths of the multiple liquid guide grooves increase in sequence, and the plane where the bottom wall of the liquid guide groove closest to the boss is located is in the same plane as the end surface of the boss away from the insulating member.

[0027] In this technical solution, by setting the number of liquid guide grooves to one, the plane where the bottom wall of the liquid guide groove is located is in the same plane as the end face of the boss away from the insulating member. On the one hand, this prevents the plane where the bottom wall of the liquid guide groove is located from being too close to the insulating member, which would make the connecting plate at the bottom wall too thin, affecting the fit between this position and the boss, and failing to limit the connecting plate and the insulating member, and also affecting the strength of the connecting plate. On the other hand, this prevents the plane where the bottom wall of the liquid guide groove is located from being too far away from the insulating member, which would make the connecting plate at the bottom wall too thick, making the cross-section of the drainage channel too small, and affecting the drainage effect. By setting multiple liquid guide grooves with increasing depths, the diversion and drainage effects can be better achieved.

[0028] 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;

[0029] The connecting plate further includes a first transition region located between the through-portion projection region and the tab connection region, and a second transition region located between the two tab connection regions;

[0030] The liquid guiding groove is provided in the second transition area; and / or,

[0031] One of the first limiting portion and the second limiting portion is provided on the connecting plate and is provided in the first transition region and / or the second transition region.

[0032] In this technical solution, by locating the liquid guide groove in the second transition region, interference with the tab and the through-hole is avoided, and the liquid guide groove is prevented from affecting the flow area between the tab and the through-hole. By locating one of the first and second limiters provided on the connecting plate in the first and / or second transition regions, interference with the tab and the through-hole is avoided.

[0033] 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;

[0034] 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.

[0035] 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.

[0036] 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;

[0037] 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.

[0038] In this technical solution, by setting a first weight-reducing structure in the transition area between the tab connection area and the through-portion projection area, that is, by performing weight-reduction treatment on the connecting plate, the beneficial technical effect of reducing the overall weight and improving the energy density of the battery is achieved.

[0039] Preferably, the cover plate assembly further comprises a second weight-reducing structure, and the second weight-reducing structure is provided in the first transition region and / or the second transition region;

[0040] 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;

[0041] The second weight-reducing structure penetrates the connecting plate along the height direction of the connecting plate;

[0042] The second weight-reducing structure is a weight-reducing through hole, or the second weight-reducing structure is a hollow structure.

[0043] In this technical solution, by setting a second weight-reducing structure in the first transition area and / or the second transition area, 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.

[0044] A single cell battery, characterized in that it comprises:

[0045] case;

[0046] The cover plate assembly as described above is disposed on the housing and defines a receiving cavity together with the housing;

[0047] The electrode assembly is accommodated in the accommodating cavity.

[0048] The positive progress effect of this utility model is:

[0049] In the present invention, a liquid guide groove is provided to connect the second through hole and the outer periphery of the connecting plate, thereby forming a liquid guide channel. Even when the tab is tightly sucked onto the connecting plate, the electrolyte can still flow out of the liquid guide channel, thereby ensuring the normal electrolyte injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic diagram of the three-dimensional structure of the cover assembly of Example 1 of the present utility model.

[0051] 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.

[0052] Figure 3 This is a bottom view structural diagram of the cover plate assembly of Example 1 of the present utility model.

[0053] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along the AA direction.

[0054] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure along direction BB.

[0055] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of part C.

[0056] Figure 7 for Figure 5 Schematic diagram of the enlarged structure of part D.

[0057] Figure 8 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 9 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 10 This is a schematic diagram of a partial bottom view of the cover assembly of Example 1 of the present utility model.

[0060] Figure 11 This is a schematic diagram of the three-dimensional structure of the cover assembly of Example 2 of the present utility model.

[0061] Description of Reference Numerals

[0062] Cover assembly 1

[0063] Electrode terminal 10

[0064] Through portion 11

[0065] Connecting plate 12

[0066] Through-portion projection area 121

[0067] Tab connection area 122

[0068] First transition region 123

[0069] Second transition region 124

[0070] Liquid guide groove 13

[0071] Second through hole 14

[0072] Cover body 20

[0073] Pole through hole 21

[0074] Liquid injection hole 23

[0075] Insulation 30

[0076] Insulation through hole 31

[0077] Protrusion 32

[0078] Part 1 321

[0079] Part II 322

[0080] The first strip protrusion 323

[0081] Second strip protrusion 324

[0082] First through hole 34

[0083] Exhaust area 35

[0084] Insulation layer 40

[0085] The first limiting portion 51

[0086] The second limiting portion 52

[0087] First weight reduction structure 61

[0088] Second weight reduction structure 62

[0089] Length direction L of the cover assembly

[0090] Width direction W of the cover assembly

[0091] Height direction H of the cover assembly

[0092] Depth a1 of the liquid guide groove

[0093] Thickness of connecting plate a2

[0094] First distance d1

[0095] First distance d2

[0096] The height h1 of the first limiting portion

[0097] The height h2 of the second limiting portion DETAILED DESCRIPTION

[0098] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0099] Example 1

[0100] This embodiment provides a cover plate assembly 1 and a single battery cell containing the same. The single battery cell comprises a housing, the cover plate assembly 1, and an electrode assembly. The cover plate assembly 1 is disposed on the housing and, together with the housing, defines a receiving cavity. The electrode assembly is received within the receiving cavity.

[0101] like Figures 1 to 7 As shown, the cap plate assembly 1 includes: an electrode terminal 10, an insulating member 30, and a cap plate body 20. The cap plate body 20 has a pole through hole 21 and a liquid injection hole 23 penetrating along the height direction H of the cap plate assembly 1.

[0102] The insulating member 30 is covered on a side of the cover body 20 facing the electrode assembly. A first through hole 34 is formed in the insulating member 30 at a position corresponding to the injection hole 23 .

[0103] The electrode terminal 10 includes a through-portion 11 and a connecting plate 12, which are connected to each other. The through-portion 11 at least partially extends through the electrode post through-hole 21. The connecting plate 12 is located on the side of the cover body 20 facing the electrode assembly, and the insulating member 30 is located between the cover body 20 and the connecting plate 12. It should be noted that the through-portion 11 passes through the electrode post through-hole 21 of the cover body 20, thereby achieving electrical connection between the electrode tab and the electrical connection component located outside the cover body 20. The through-portion 11 is typically cylindrical.

[0104] A second through hole 14 is provided through the connecting plate 12 at a position corresponding to the first through hole 34. A partial area on the side of the connecting plate 12 facing the electrode assembly is recessed in a direction away from the electrode assembly to form a liquid guide groove 13. The liquid guide groove 13 connects the second through hole 14 and the outer periphery of the connecting plate 12, and along the height direction H of the cover plate assembly 1, the depth a1 of the liquid guide groove 13 is less than the thickness a2 of the connecting plate 12.

[0105] Thus, by providing a liquid guide groove 13 connecting the second through-hole 14 and the outer periphery of the connecting plate 12, a liquid guide channel is formed. Even when the tab is tightly attached to the connecting plate 12, the electrolyte can still flow out of the liquid guide channel, thereby ensuring normal electrolyte injection. Furthermore, by setting the depth a1 of the liquid guide groove 13 along the height direction H of the cover plate assembly 1 to be less than the thickness a2 of the connecting plate 12, that is, the location of the liquid guide groove 13 is provided as a solid structure, the connection strength of the connecting plate 12 itself can be ensured.

[0106] The insulating member 30 includes a vent area 35 corresponding to the explosion-proof valve. On the side of the insulating member 30 close to the electrode assembly, the vent area 35 protrudes toward the electrode assembly to prevent the electrolyte from flowing from the vent holes in the vent area 35 to the explosion-proof valve, thereby affecting the normal operation of the explosion-proof valve.

[0107] Preferably, along the height direction H of the cover plate assembly 1, the depth a1 of the liquid guide groove 13 is greater than or equal to one-third of the thickness a2 of the connecting plate 12, and less than the thickness a2 of the connecting plate 12. Thus, by setting a range of values for the depth a1 of the liquid guide groove 13, while ensuring optimal connection strength of the connecting plate 12, normal electrolyte injection into the liquid guide channel formed by the liquid guide groove 13 is ensured.

[0108] In this embodiment, the end of the liquid guiding groove 13 close to the second through hole 14 is provided around a portion of the outer periphery of the second through hole 14. However, the present invention is not limited thereto. In other embodiments, the end of the liquid guiding groove 13 close to the second through hole 14 is provided around the entire outer periphery of the second through hole 14.

[0109] In this embodiment, the cover plate assembly 1 further includes a first stopper 51 and a second stopper 52. One of the first stopper 51 and the second stopper 52 is located on the side of the insulating member 30 facing the electrode assembly, and the other is located on the side of the connecting plate 12 facing the insulating member 30. The first stopper 51 and the second stopper 52 cooperate to limit relative movement between the connecting plate 12 and the insulating member 30. The first stopper 51 extends into the second stopper 52, and along the height direction H of the cover plate assembly 1, the height h1 of the first stopper 51 is greater than or equal to one-third of the height h2 of the second stopper 52, and less than the height h2 of the second stopper 52.

[0110] 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.

[0111] 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 stopper 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 stopper 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 stopper 52, 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 stopper 51. Thus, through the above arrangement, a specific arrangement of the first stopper 51 and the second stopper 52 is provided, which can more effectively limit the relative movement between the connecting plate 12 and the insulating member 30.

[0112] 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 .

[0113] For details, please refer to Figure 7The first limiting portion 51 is a boss provided on the side of the insulating member 30 facing the electrode assembly, and the second limiting portion 52 is a through-hole provided in the connecting plate 12. As previously described, along the height direction H of the cover plate 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 plate 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. The height (i.e., the depth) of the through-hole is equal to the thickness a2 of the connecting plate 12 where the through-hole is provided.

[0114] 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 .

[0115] 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.

[0116] One of the bosses is arranged around the first through hole 34; one of the through holes opened on the connecting plate 12 is a second through hole 14 provided on the connecting plate 12, so as to be able to effectively combine the second limiting portion 52 and the second through hole 14 together, thereby simplifying the overall structure.

[0117] Specifically, in this embodiment, please refer to Figure 3 In the figure, the boss (first limiting portion 51) located on the upper side is arranged around the first through hole 34 and extends into the second through hole 14 (second limiting portion 52) arranged corresponding thereto.

[0118] 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.

[0119] 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 W of the cover assembly 1. Thus, by setting the boss of the ring structure 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 W of the cover assembly 1. Thus, by setting the boss of the ring structure as a runway-shaped boss, with the long side of the runway-shaped boss corresponding to the width direction W 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.

[0120] 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 racetrack-shaped boss; Figure 2 The boss of the ring-shaped structure on the right side of the middle insulating member 30 is a circular boss.

[0121] Please refer back to Figure 6 The extending direction of the side wall of the boss is in the same direction as the height direction H of the cover assembly 1. However, it is not limited to this. Please refer to Figure 7 Alternatively, the side wall of the boss extends obliquely from the bottom end to the top end toward the center of the boss, that is, the top end of the side wall of the boss is tightened toward the center relative to the bottom end, thereby avoiding damage to the boss during assembly. The bottom end of the boss refers to the end where the boss is connected to the insulating member 30, and the top end of the boss refers to the free end of the boss. Furthermore, the side wall of the boss forms an angle α with the height direction H of the cover assembly 1, and the angle α is 3 degrees to 5 degrees. In this way, by setting the value range of the angle α formed by the side wall of the boss and the height direction H of the cover assembly 1, on the one hand, it is possible to avoid the inclination angle of the side wall of the boss being too large, thereby affecting the cooperation with the through hole (the second limiting portion 52); on the other hand, it is possible to avoid the inclination angle of the side wall of the boss being too small, thereby failing to prevent the boss from being damaged during assembly.

[0122] Specifically, the diameter of the through hole is 14%-47% of the width of the connecting plate 12. 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 12, 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 12 and the insulating member 30. 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.

[0123] 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 12. 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 12, 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 12 and the insulating member 30. 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.

[0124] In this embodiment, there is one liquid-conducting groove 13, and the plane where the bottom wall of the liquid-conducting groove 13 lies is coplanar with the end face of the boss away from the insulating member 30. Thus, by setting the number of liquid-conducting grooves 13 to be one and the plane where the bottom wall of the liquid-conducting groove 13 lies coplanar with the end face of the boss away from the insulating member 30, this, on the one hand, prevents the plane where the bottom wall of the liquid-conducting groove 13 lies from being too close to the insulating member 30, thereby preventing the connecting plate 12 at the bottom wall from being too thin, affecting the fit between the bottom wall and the boss, and failing to limit the connection plate 12 and the insulating member 30, and also affecting the strength of the connecting plate 12. On the other hand, this prevents the plane where the bottom wall of the liquid-conducting groove 13 lies from being too far from the insulating member 30, thereby preventing the connecting plate 12 at the bottom wall from being too thick, thereby reducing the cross-section of the drainage channel and affecting the drainage effect.

[0125] However, the present invention is not limited thereto. In other embodiments, the plurality of liquid-conducting grooves 13 may be connected in sequence from the second through-hole 14 to the outer periphery of the connecting plate 12. The depths of the plurality of liquid-conducting grooves 13 may increase sequentially, and the bottom wall of the liquid-conducting groove 13 closest to the boss may be coplanar with the end face of the boss away from the insulating member 30. Thus, by providing the plurality of liquid-conducting grooves 13 with sequentially increasing depths, a better diversion and drainage effect may be achieved.

[0126] like Figure 8 and Figure 9 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.

[0127] 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 122 .

[0128] The liquid conducting groove 13 is provided in the second transition region 124 to prevent the liquid conducting groove 13 from interfering with the tab and the through portion 11 ; and to prevent the liquid conducting groove 13 from affecting the flow area between the tab and the through portion 11 .

[0129] 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 11. 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 20, 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 therein, 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.

[0130] 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.

[0131] 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 h 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] Further, if Figure 10 As shown, 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 10In 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] It should be noted that Figure 10 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] Furthermore, the cover plate assembly 1 also includes a second weight-reducing structure 62, which is disposed in the first transition region 123 and is located within the first weight-reducing structure 61. Thus, by providing the second weight-reducing structure 62 in the transition region, 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] In this embodiment, the manufacturing steps of the cover plate assembly 1 are as follows:

[0156] Step 100: Processing the electrode terminal 10 by stamping or machining;

[0157] Step 200: Assemble the insulating member 30 and the electrode terminal 10 together through an assembly process;

[0158] Step 300 : super welding and laser welding the tab to the connection plate 12 of the electrode terminal 10 .

[0159] Since the liquid guide groove 13 is provided on the connecting plate 12 of the electrode terminal 10 corresponding to the liquid injection hole 23 , even if the tab is longer, it cannot completely cover the liquid injection hole 23 , thus having no effect on liquid injection.

[0160] In this embodiment, a liquid guide groove 13 is provided to connect the second through hole 14 and the outer periphery of the connecting plate 12, thereby forming a liquid guide channel. Even when the tab is tightly sucked onto the connecting plate 12, the electrolyte can still flow out of the liquid guide channel, thereby ensuring the normal electrolyte injection.

[0161] Example 2

[0162] like Figure 11 As shown, the overall structure of the cover plate assembly 1 and the single battery cell including the same in this embodiment is basically the same as that in Example 1, except that the end of the liquid guide groove 13 near the second through hole 14 is arranged around the entire outer periphery of the second through hole 14. Thus, by arranging the end of the liquid guide groove 13 near the second through hole 14 around the entire outer periphery of the second through hole 14, the space available for accommodating electrolyte at the end of the liquid guide groove 13 near the second through hole 14 is expanded, thereby achieving better diversion and drainage effects.

[0163] 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 pole through hole and a liquid injection hole penetrating along the height direction of the cover plate assembly; an insulating member, the insulating member being covered on a side of the cover plate body facing the electrode assembly, the insulating member being provided with a first through hole corresponding to the injection hole; An electrode terminal, wherein the electrode terminal includes a through-portion and a connecting plate connected to each other, the through-portion at least partially passing through the pole through-hole, the connecting plate being located on the side of the cover plate body facing the electrode assembly, and the insulating member being located between the cover plate body and the connecting plate, the connecting plate being provided with a second through-hole corresponding to the position of the first through-hole, a partial area of the connecting plate on the side facing the electrode assembly being recessed in a direction away from the electrode assembly to form a liquid guide groove, the liquid guide groove being connected to the second through-hole and the outer periphery of the connecting plate, and the depth of the liquid guide groove along the height direction of the cover plate assembly is less than the thickness of the connecting plate.

2. The cover plate assembly according to claim 1, wherein: The insulating member includes a venting area corresponding to the explosion-proof valve, and on a side of the insulating member close to the electrode assembly, the venting area protrudes toward the electrode assembly; and / or, Along the height direction of the cover plate assembly, the depth of the liquid guide groove is greater than or equal to one third of the thickness of the connecting plate and less than the thickness of the connecting plate; and / or, One end of the liquid guiding groove close to the second through hole is arranged around the outer periphery of the second through hole.

3. The cover plate assembly according to claim 1, wherein: A first limiting portion and a second limiting portion, one of the first limiting portion and the second limiting portion is arranged on a side of the insulating member facing the electrode assembly, and the other is arranged 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 plate 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 is less than the height of the second limiting portion.

4. The cover plate assembly according to claim 3, 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 is protruded toward the insulating member to form the first limiting portion.

5. The cover plate assembly according to claim 4, 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.

6. The cover plate assembly according to claim 5, wherein: One of the first limiting parts is a boss provided on the insulating member, and the boss is provided around the first through hole; one of the second limiting parts is the second through hole provided on the connecting plate.

7. The cover plate assembly according to claim 6, wherein: There is one liquid-conducting groove, and the bottom wall of the liquid-conducting groove is located on the same plane as the end surface of the boss away from the insulating member; or There are multiple liquid guide grooves, and the multiple liquid guide grooves are connected in sequence from the second through hole to the outer periphery of the connecting plate. The depths of the multiple liquid guide grooves increase in sequence, and the plane where the bottom wall of the liquid guide groove closest to the boss is located is in the same plane as the end surface of the boss away from the insulating member.

8. The cover plate assembly according to claim 3, 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 further includes a first transition region located between the through-portion projection region and the tab connection region, and a second transition region located between the two tab connection regions; The liquid guiding groove is provided in the second transition area; and / or, One of the first limiting portion and the second limiting portion is provided on the connecting plate and is provided in the first transition region and / or the second transition region.

9. The cover plate assembly according to claim 8, 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.

10. The cover plate assembly according to claim 8, 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.

11. The cover plate assembly according to claim 10, 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.

12. A single cell battery, characterized in that: It includes: case; The cover plate assembly according to any one of claims 1 to 11, 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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