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 insulating part covers one side, facing the electrode assembly, of the cover plate body; 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, and the insulating part is located between the cover plate body and the connecting plate; the connecting plate comprises a first side edge away from the penetrating part, and the orthographic projection part of the first side edge in the height direction is located in the first through hole of the insulating part; an avoiding part is arranged at the position, corresponding to the first through hole, of the connecting plate, the side, facing the insulating part, of the avoiding part is sunken in the direction away from the insulating part to form a liquid guide channel, and a first outlet of the liquid guide channel is defined by the first side edge and the side, facing the electrode assembly, of the insulating part. By arranging the avoiding part, normal electrolyte injection can be guaranteed, the area of the connecting plate is increased, and forward gain is achieved in the aspect of heat dissipation.

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 structure of square shell batteries, the general square shell top cover without adapter plate solution adopts a large base plate electrode terminal (pole), and the electrode assembly is welded on both sides of the large base plate through the tabs.

[0003] When producing large base plates, on the one hand, in order to improve material utilization and reduce weight, on the other hand, too long a base plate will cause parallelism and flatness to exceed specifications, so the length of the base plate is limited to an appropriate range.

[0004] However, due to the existence of the liquid injection hole, the liquid injection hole will interfere with the end of the large bottom plate.

[0005] After interference occurs, if the length of the base plate is shortened, welding failure may occur due to insufficient weld print size; if the length of the base plate is increased, the flatness and parallelism may easily exceed the specifications, affecting the yield rate. Utility Model Content

[0006] The technical problem to be solved by the present invention is to overcome the above-mentioned technical problems in the prior art and provide a cover plate assembly and a single battery comprising the same.

[0007] The utility model solves the above technical problems through the following technical solutions:

[0008] A cover plate assembly is characterized in that it comprises:

[0009] The cover plate body has a pole through hole and a liquid injection hole penetrating along the height direction of the cover plate assembly;

[0010] 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;

[0011] 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, the connecting plate being located on a side of the cover body facing the electrode assembly, and the insulating member being located between the cover body and the connecting plate;

[0012] Along the length direction of the cover plate assembly, the connecting plate includes a first side away from the through portion, and the orthographic projection of the first side along the height direction of the cover plate assembly is located within the first through hole;

[0013] The connecting plate is provided with an avoidance portion at a position corresponding to the first through hole, and the avoidance portion is recessed toward a side of the insulating member away from the insulating member to form a liquid conduction channel, and the first side edge and the side of the insulating member toward the electrode assembly are surrounded to form a first outlet of the liquid conduction channel.

[0014] In the present technical solution, by arranging the first side edge of the connecting plate away from the through portion so that the positive projection part in the height direction of the cover plate assembly is located in the first through hole, the size of the connecting plate along the length direction can be effectively controlled, so that the length of the connecting plate is limited to a suitable range, which can effectively improve the material utilization rate and reduce the weight while ensuring the parallelism and flatness of the connecting plate; and, by arranging the avoidance portion to form a liquid guide channel, even when the pole ear is tightly sucked on the connecting plate, the electrolyte can still flow out from the injection hole through the liquid guide channel to the outside of the connecting plate, thereby ensuring the normal electrolyte injection. At the same time, the structure of the avoidance portion can increase the area of the connecting plate, which plays a positive gain in heat dissipation.

[0015] Preferably, a first accommodation space is provided on a side of the insulating member facing the electrode assembly and is recessed away from the electrode assembly, and the connecting plate is located in the first accommodation space;

[0016] Along the height direction of the cover plate assembly, a distance from a side of the avoidance portion facing the electrode assembly to a bottom wall of the first accommodating space is smaller than a depth of the first accommodating space at the avoidance portion.

[0017] In the present technical solution, through the above arrangement, the side of the avoidance portion facing the electrode assembly does not protrude from the first accommodating space, thereby avoiding interference with surrounding components.

[0018] Preferably, along the height direction of the cover assembly, the thickness of the avoidance portion is less than the thickness of the connecting plate and is greater than or equal to 0.7 mm; along the width direction of the cover assembly, the size of the avoidance portion is 9.4 mm-18 mm; and / or,

[0019] Along the height direction of the cover plate assembly, the depth of the liquid guide channel is 2.4mm-3.6mm; along the width direction of the cover plate assembly, the size of the liquid guide channel is 8mm-16.6mm.

[0020] In this technical solution, by setting a value range for the thickness of the avoidance portion, on the one hand, it is possible to avoid the avoidance portion from being too thin and easily broken; on the other hand, the avoidance portion from being too thick, affecting the liquid-conducting cross-sectional area formed by the liquid-conducting channel, and thus affecting the liquid-conducting effect. By setting a value range for the dimension of the avoidance portion along the width direction of the cover plate assembly, on the one hand, it is possible to avoid the dimension being too large and interfering with the connection between the tab connection area and the tab; on the other hand, it is possible to avoid the dimension being too small and affecting the liquid-conducting cross-sectional area formed by the liquid-conducting channel, and thus affecting the liquid-conducting effect. By setting a value range for the depth of the liquid-conducting channel and the dimension of the liquid-conducting channel along the width direction of the cover plate assembly, it is possible to achieve optimization between the flow area of the liquid-conducting channel formed by the liquid-conducting channel and structural stability.

[0021] Preferably, along the height direction of the cover plate assembly, the thickness of the avoidance portion is 38%-58% of the thickness of the connecting plate; and / or,

[0022] Along the width direction of the cover plate assembly, the size of the avoidance portion is 22%-43% of the size of the connecting plate.

[0023] In this technical solution, by limiting the ratio range of the thickness of the avoidance portion and the thickness of the connecting plate, on the one hand, it is possible to prevent the avoidance portion from being too thin and prone to breakage; on the other hand, the avoidance portion being too thick, which would affect the cross-sectional area of the liquid guide channel formed by the liquid guide channel, thereby affecting the liquid guide effect. By limiting the ratio range of the dimensions of the avoidance portion and the connecting plate along the width direction of the cover plate assembly, on the one hand, it is possible to prevent the ratio from being too large and interfering with the connection between the tab connection area and the tab; on the other hand, it is possible to prevent the ratio from being too small and affecting the cross-sectional area of the electrolyte formed by the liquid guide channel, thereby affecting the liquid guide effect.

[0024] Preferably, along the length direction of the cap plate assembly, 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;

[0025] 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;

[0026] The avoidance portion is provided in the second transition region, and one side of the avoidance portion overlaps with the first side edge of the connecting plate.

[0027] In this technical solution, by arranging the avoidance portion in the second transition area, that is, arranging the liquid guide channel in the second transition area, the liquid guide channel is prevented from interfering with the tab and the through portion; and the liquid guide channel is prevented from affecting the flow area between the tab and the through portion.

[0028] Preferably, a partial area on a side of the insulating member facing the electrode assembly protrudes toward the electrode assembly to form a 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 a second limiting portion, and the second limiting portion is located in the first transition region; or,

[0029] A partial area on the side of the insulating part facing the electrode assembly is recessed in a direction away from the electrode assembly to form a second limiting portion, and a partial area on the side of the connecting plate facing the insulating part protrudes in a direction close to the insulating part to form a first limiting portion, and the first limiting portion is located in the first transition area.

[0030] In this 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 assembly accuracy and product yield.

[0031] 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,

[0032] The number of the first limiting parts corresponds to the number of the second limiting parts, and there is at least one of each.

[0033] In the present technical solution, the above-mentioned configuration provides a specific configuration method of the first limiting portion and the second limiting portion.

[0034] Preferably, the insulating member is provided with a first protrusion on a side facing the connecting plate, the first protrusion protruding toward the connecting plate, and the orthographic projection of the first 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 first protrusions is set to correspond to the number of the tab connection areas, and the orthographic projection of each first protrusion along the height direction of the cover plate assembly is at least partially located within the corresponding tab connection area.

[0036] In the present technical solution, a first 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 a short circuit, that is, ensuring the electrical safety of the battery; and the orthographic projection of the first protrusion along the height direction of the cover plate assembly is located within the outer edge of the connecting plate, that is, the first 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 due to melting and deformation. , thereby ensuring the normal operation and aesthetics of the internal components of the battery cell; by setting the number of the first protrusions to correspond to the number of the tab connection areas, the orthographic projection of each first 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 between the entire connecting plate and 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, a portion of the first transition region is bent toward the electrode assembly to form a second accommodating space for accommodating the first protrusion.

[0038] In this technical solution, a part of the first transition area is bent toward the electrode assembly to form a second accommodating space for the first protrusion. On the one hand, it can prevent the heat generated by the welding ear from burning the insulating part, and on the other hand, it can make the connecting plate have better flatness.

[0039] Preferably, the first transition region forms a bent portion in the bent region, and the bent portion includes a first bent portion and a second bent portion that are bent in different directions and connected;

[0040] The first bending portion and the second bending portion are both obliquely bent; and / or, the bending positions of the first bending portion and the second bending portion are both rounded.

[0041] In the present technical solution, by providing a bending portion including a first bending portion and a second bending portion that are bent in different directions and connected to each other, a Z-shaped bending structure is formed, which saves the physical structure required to form the accommodation space to the maximum extent, so that the overall structure is more compact. By providing the first bending portion and the second bending portion to be obliquely bent, the connection reliability at the bending point can be better guaranteed compared to the right-angle bend that is prone to stress concentration, and the mechanical properties are better. By providing the bending positions of the first bending portion and the second bending portion to be rounded, the risk of fracture caused by stamping metal is reduced, and the arc surface transition formed by the rounded corners can improve the connection strength of the components, thereby reducing the risk of connection failure of the connecting plate under extreme working conditions such as vibration and impact, and greatly improving the reliability of the structure.

[0042] Preferably, the second transition region is provided with a weight-reducing through-hole penetrating along the height direction of the cover plate assembly, and the weight-reducing through-hole is a closed structure; along the length direction of the cover plate assembly, the sidewall of the weight-reducing through-hole close to the first side overlaps with the side of the avoidance portion away from the first side, and the side of the avoidance portion away from the first side and the side of the insulating member facing the electrode assembly enclose a second outlet of the liquid guide channel;

[0043] Along the width direction of the cover plate assembly, the size of the avoidance portion is smaller than or equal to the size of the weight-reducing through hole, and larger than or equal to the size of the liquid injection hole.

[0044] In this technical solution, by providing a weight-reducing through-hole in the second transition region, that is, by reducing the weight of the connecting plate, the beneficial technical effect of reducing the overall weight and increasing the energy density of the battery is achieved. Furthermore, by arranging the specific position of the weight-reducing through-hole so that the sidewall of the weight-reducing through-hole close to the first side overlaps with the side of the avoidance portion away from the first side, the weight-reducing through-hole can be arranged as close to the avoidance portion as possible, thereby maximizing the area of the weight-reducing through-hole and achieving the beneficial technical effect of further weight reduction. At the same time, the sidewall of the weight-reducing through-hole close to the first side and the side of the insulating member facing the electrode assembly enclose a second outlet of the liquid guide channel, thereby forming more liquid guide outlets, which facilitates faster liquid drainage. Furthermore, by setting the size of the avoidance portion along the width direction of the cover plate assembly to be less than or equal to the size of the weight-reducing through-hole and greater than or equal to the size of the injection hole, the liquid guide channel of the avoidance portion can guide the electrolyte flowing out of the injection hole while avoiding interference with the connection between the tab connection area and the tab; moreover, the avoidance portion is similar to the structure of a reinforcing rib, which can also have a certain beneficial effect on the overall structural strength of the connecting plate.

[0045] Preferably, when the electrode terminal is a positive electrode terminal, the size of the avoidance portion along the length direction of the cover assembly is 3 mm to 7 mm;

[0046] When the electrode terminal is a negative electrode terminal, a size of the avoidance portion is 2 mm to 7 mm along the length direction of the cover assembly.

[0047] In this technical solution, by setting a range of values for the size of the escape portion along the length of the cover plate assembly, on the one hand, it is prevented that the size is too small, thereby preventing effective connection between the two tab connection areas and failing to ensure the overall strength and stability of the structure; on the other hand, it is prevented that the size is too large, thereby affecting the area formed by the weight-saving through-hole. It should be noted that since the positive electrode terminal is generally made of aluminum, while the negative electrode terminal is generally made of copper, which is harder than aluminum, the minimum size of the escape portion of the negative electrode terminal along the length of the cover plate assembly is smaller than the minimum size of the escape portion of the positive electrode terminal.

[0048] Preferably, the insulating member is provided with a second protrusion on a side facing the electrode assembly, the second protrusion being arranged on the outside of the first through hole along the length direction of the cover plate assembly and spaced apart from the avoidance portion of the connecting plate;

[0049] Along the length direction of the cover plate assembly, the second protrusion is arranged on the outer side of the first side of the connecting plate, and / or the second protrusion is arranged in the weight-reducing through hole.

[0050] In this technical solution, by positioning the second protrusion on the outside of the first side of the connecting plate, the electrolyte is prevented from flowing toward the exhaust area of the insulating member corresponding to the explosion-proof valve, thereby preventing the electrolyte from flowing from the exhaust area to the explosion-proof valve and affecting the normal operation of the explosion-proof valve. By positioning the second protrusion within the weight-reducing through-hole, the electrolyte is prevented from flowing into the recessed portion on the side of the through-portion facing the electrode assembly, which is recessed away from the electrode assembly and affects the electrolyte storage capacity in the electrode assembly.

[0051] A single battery, characterized in that it comprises:

[0052] case;

[0053] The cover plate assembly as described above is disposed on the housing and defines a receiving cavity together with the housing;

[0054] The electrode assembly is accommodated in the accommodating cavity.

[0055] The positive progress effect of this utility model is:

[0056] In the present invention, by arranging the first side edge of the connecting plate away from the through-hole portion so that the positive projection part in the height direction of the cover plate assembly is located in the first through hole, the size of the connecting plate along the length direction can be effectively controlled, so that the length of the connecting plate is limited to a suitable range, which can effectively improve the material utilization rate and reduce the weight while ensuring the parallelism and flatness of the connecting plate; and, by arranging the avoidance portion, a liquid guide channel is formed. Even when the pole ear is tightly sucked on the connecting plate, the electrolyte can still flow out from the injection hole through the liquid guide channel to the outside of the connecting plate, thereby ensuring the normal electrolyte injection. At the same time, the structure of the avoidance portion can increase the area of the connecting plate, which has a positive gain in heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0058] 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.

[0059] Figure 3 This is a schematic diagram of the three-dimensional exploded structure of the cover assembly of Example 1 of the present invention from another angle.

[0060] Figure 4 This is a bottom view structural diagram of the cover plate assembly of Example 1 of the present utility model.

[0061] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along the AA direction.

[0062] Figure 6 for Figure 4 Schematic diagram of the cross-sectional structure along direction BB.

[0063] Figure 7 for Figure 6 Schematic diagram of the enlarged structure of part C.

[0064] 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.

[0065] 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.

[0066] Figure 10 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 invention from another angle.

[0067] Figure 11 This is a schematic diagram of a partial bottom view of the cover assembly of Example 1 of the present utility model.

[0068] Figure 12 This is a schematic diagram of the three-dimensional structure of the cover assembly of Example 2 of the present utility model.

[0069] Description of Reference Numerals

[0070] Cover plate assembly 1; electrode terminal 10; positive electrode terminal 101; negative electrode terminal 102; through portion 11; recessed portion 111; connecting plate 12; first side edge 1201; through portion projection area 121; tab connection area 122; first transition area 123; second transition area 124; escape portion 125; escape portion sidewall 1251; liquid guide channel 126; first outlet 1261; second outlet 1262; weight reduction through hole 127; second accommodating space 128 ; Bending portion 129; First bending portion 1291; Second bending portion 1292; Cover plate body 20; Pole through hole 21; Liquid injection hole 23; Insulating member 30; First through hole 31; First accommodating space 32; First raised portion 33; First part 331; Second part 332; First strip-shaped raised portion 333; Second strip-shaped raised portion 334; Second raised portion 34; Second through hole 35; Exhaust area 36; Insulating layer 40; First limiting portion 51; Second limiting portion 52; Explosion-proof valve 60. DETAILED DESCRIPTION

[0071] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0072] Example 1

[0073] 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.

[0074] like Figures 1 to 10 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.

[0075] The insulating member 30 is covered on a side of the cover body 20 facing the electrode assembly. A first through hole 31 is formed in the insulating member 30 at a position corresponding to the injection hole 23 .

[0076] 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.

[0077] Along the length direction L of the cover assembly 1 , the connecting plate 12 includes a first side 1201 away from the through portion 11 , and an orthographic projection of the first side 1201 along the height direction H of the cover assembly 1 is located within the first through hole 31 .

[0078] An avoidance portion 125 is provided at a position of the connecting plate 12 corresponding to the first through hole 31. The avoidance portion 125 is recessed toward a side of the insulating member 30 away from the insulating member 30 to form a liquid guide channel 126. The first side edge 1201 and the side of the insulating member 30 toward the electrode assembly are surrounded to form a first outlet 1261 of the liquid guide channel 126.

[0079] In this way, by setting the first side edge 1201 of the connecting plate 12 away from the through portion 11 so that the positive projection portion along the height direction H of the cover plate assembly 1 is located within the first through hole 31, the size of the connecting plate 12 along the length direction L can be effectively controlled, so that the length of the connecting plate 12 is limited to a suitable range, which can effectively improve material utilization and reduce weight while ensuring the parallelism and flatness of the connecting plate 12; and, by setting the avoidance portion 125 to form a liquid guide channel 126, even when the tab is tightly sucked on the connecting plate 12, the electrolyte can still flow out from the injection hole 23 through the liquid guide channel 126 to the outside of the connecting plate 12, thereby ensuring the normal electrolyte injection. At the same time, the structure of the avoidance portion 125 can increase the area of the connecting plate 12, which has a positive gain in heat dissipation. It should be noted that, generally after liquid injection, the plastic nail used to block the liquid injection hole 23 will generally protrude from the insulating part 30. A avoidance space for avoiding the plastic nail is formed on the side of the insulating part 30 facing the electrode assembly. The avoidance space is located in the liquid guide channel 126, thereby avoiding the bottom wall of the liquid guide channel 126 from interfering with the plastic nail.

[0080] The avoidance portion 125 forms a boss structure, and the bending positions of the boss structure are all rounded to reduce the risk of breakage due to stamping of metal, and the arc surface transition formed by the rounded corners can improve the connection strength of the components, thereby reducing the risk of connection failure of the connecting plate 12 under extreme working conditions such as vibration and impact, and greatly improving the structural reliability.

[0081] A first accommodating space 32 is defined on the side of the insulating member 30 facing the electrode assembly, recessed away from the electrode assembly. The connecting plate 12 is located within the first accommodating space 32. Along the height H of the cover plate assembly 1, the distance e1 from the side of the relief portion 125 facing the electrode assembly to the bottom wall of the first accommodating space 32 is less than the depth e2 of the first accommodating space 32 at the relief portion 125. This arrangement prevents the relief portion 125 from protruding beyond the first accommodating space 32 on the side facing the electrode assembly, thereby preventing interference with surrounding components.

[0082] Preferably, along the height direction H of the cover plate assembly 1, the thickness a1 of the avoidance portion 125 is less than the thickness a3 of the connecting plate 12 and is greater than or equal to 0.7 mm. In this way, by setting the value range of the thickness a1 of the avoidance portion 125, on the one hand, it is possible to avoid the thickness a1 of the avoidance portion 125 being too small, which may cause it to break easily; on the other hand, if the thickness a1 of the avoidance portion 125 is too large, it will affect the liquid guide cross-sectional area formed by the liquid guide channel 126, thereby affecting the liquid guide effect. Preferably, along the height direction H of the cover plate assembly 1, the thickness a1 of the avoidance portion 125 is 38%-58% of the thickness a3 of the connecting plate 12. The avoidance portion 125 can be appropriately thinned by deep drawing according to the material thickness of the connecting plate 12 to form a thinner thickness.

[0083] Along the width direction W of the cover plate assembly 1, the dimension b1 of the relief portion 125 is between 9.4 mm and 18 mm. By setting the range of values for the dimension b1 of the relief portion 125 along the width direction W of the cover plate assembly 1, on the one hand, this dimension b1 is prevented from being too large, thereby interfering with the connection between the tab connection area 122 and the tab; on the other hand, this dimension b1 is prevented from being too small, thereby affecting the liquid-conducting cross-sectional area formed by the liquid-conducting channel 126 and thus impairing the liquid-conducting effect. Preferably, along the width direction W of the cover plate assembly 1, the dimension b1 of the relief portion 125 is between 22% and 43% of the dimension b3 of the connecting plate 12.

[0084] Along the height direction H of the cover plate assembly 1, the depth a2 of the liquid-conducting channel 126 is 2.4 mm to 3.6 mm; along the width direction W of the cover plate assembly 1, the dimension b2 of the liquid-conducting channel 126 is 8 mm to 16.6 mm. Thus, by setting the range of values for the depth a2 of the liquid-conducting channel 126 and the dimension b2 of the liquid-conducting channel 126 along the width direction W of the cover plate assembly 1, it is possible to optimize the flow area of the electrolyte formed by the liquid-conducting channel 126 and the structural stability.

[0085] Please refer back to Figure 5, the extension direction of the side wall 1251 of the avoidance portion 125 is in the same direction as the height direction H of the cover plate assembly 1. However, it is not limited to this. In other embodiments, the side wall of the avoidance portion 125 may be extended obliquely from the bottom end to the top end toward the center direction of the avoidance portion 125, that is, the top end of the side wall of the avoidance portion 125 is tightened toward the center direction relative to the bottom end, thereby facilitating demolding in processing and manufacturing. In addition, without interfering with the injection, the oblique extension of the side wall can increase the thickness of the side wall, which will have a gain effect on the structural strength. Among them, the bottom end of the side wall of the avoidance portion 125 refers to the end where the side wall is connected to the connecting plate 12, and the top end of the side wall is the end away from the connecting plate 12. Furthermore, the side wall of the avoidance portion 125 forms an angle with the height direction H of the cover plate assembly 1, and the angle is greater than 0 degrees and less than or equal to 45 degrees.

[0086] Specifically, along the length direction L of the cover plate assembly 1, 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 connected to the tab led out from the electrode assembly; the number of tab connection areas 122 in each electrode terminal 10 is two, and the two tab connection areas 122 are symmetrically arranged on both sides of the through-portion 11.

[0087] The connecting plate 12 also includes a first transition region 123 located between the through-portion projection area 121 and the tab connection area 122, and a second transition region 124 located between the two tab connection areas 122. A relief portion 125 is provided in the second transition region 124, with one side of the relief portion 125 overlapping with the first side 1201 of the connecting plate 12. By locating the relief portion 125 in the second transition region 124, and thus the liquid guide channel 126 in the second transition region 124, interference with the tabs and through-portion 11 is avoided, and the liquid guide channel 126 is prevented from affecting the flow area between the tabs and the through-portion 11.

[0088] 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. 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. The second stopper 52 is located in the first transition region 123. Thus, by providing the mutually cooperating first and second stoppers 51, 52 to limit relative movement between the connecting plate 12 and the insulating member 30, offset of the insulating member 30 during assembly can be prevented, thereby improving assembly accuracy and product yield.

[0089] However, the present invention is not limited thereto. In other embodiments, a partial area on the side of the insulating member 30 facing the electrode assembly may be recessed in a direction away from the electrode assembly to form a second limiting portion, and a partial area on the side of the connecting plate 12 facing the insulating member 30 may be protruded in a direction close to the insulating member 30 to form a first limiting portion, and the first limiting portion may be located in the first transition region 123.

[0090] 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 .

[0091] Specifically, the 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. However, this is not limiting. 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 relative movement between the connecting plate 12 and the insulating member 30.

[0092] The number of first limiting portions 51 corresponds to the number of second limiting portions 52, and each portion is at least one. In this embodiment, there are two electrode terminals 10, and both electrode terminals 10 are provided with two second limiting portions 52, that is, the number of second limiting portions 52 is four. 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.

[0093] In this embodiment, a first protrusion 33 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 first protrusion 33 along the height direction H of the cap plate assembly 1 is located within the outer edge of the connecting plate 12. Thus, by providing the first protrusion 33 on the side of the insulating member 30 facing the connecting plate 12, protruding toward 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 preventing short circuits and ensuring the electrical safety of the battery. Furthermore, by locating the orthographic projection of the first protrusion 33 along the height direction H of the cap plate assembly 1 within the outer edge of the connecting plate 12, i.e., by locating the first protrusion 33 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 proper operation and aesthetics of the internal components of the battery cell.

[0094] The number of first protrusions 33 corresponds to the number of tab connection areas 122, and the orthographic projection of each first protrusion 33 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 first protrusions 33 to correspond to the number of tab connection areas 122, the orthographic projection of each first protrusion 33 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 between the connecting plate 12 and the tab, 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.

[0095] As mentioned above, the electrode terminal 10 has two tab connection regions 122, which are symmetrically arranged on both sides of the through portion 11. Correspondingly, the electrode terminal 10 also has two first protrusions 33, which are respectively arranged corresponding to the two tab connection regions 122.

[0096] Specifically, if Figure 11 As shown, each first protrusion 33 includes a first portion 331 and a second portion 332 connected to each other. The orthographic projection of the first portion 331 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 332 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 first protrusion 33 to include the first portion 331 and the second portion 332, the first protrusion 33 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 first protrusion 33. 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 ensuring the electrical safety of the battery. Furthermore, the insulating member 30 is less likely to overflow due to melting and deformation, thereby ensuring the normal operation and aesthetics of the internal components of the battery cell. In other embodiments, the first protrusion 33 may also include only the first portion 331 whose orthographic projection along the height direction H of the cover plate assembly 1 is located within the corresponding tab connection area 122, so as to ensure that the first protrusion 33 is slowed down from melting due to the high welding temperature. In order to illustrate the position of the first portion 331 relative to the tab connection area 122, and the position of the second portion 332 relative to the first transition area 123 and the second transition area 124, Figure 11, the structures of the tab connection region 122 , the first portion 331 and the second portion 332 are all represented by dotted lines, and the dotted lines used in the tab connection region 122 are different from the dotted lines used in the first portion 331 and the second portion 332 .

[0097] Specifically, in this embodiment, the first raised portion 33 has a frame-like structure. Furthermore, the first raised portion 33 includes two first strip-shaped protrusions 333 extending along the length direction L of the cover plate assembly 1, and two second strip-shaped protrusions 334 extending along the width direction W of the cover plate assembly 1. This frame-like structure of the first raised portion 33 facilitates processing of the first raised portion 33. Furthermore, the first strip-shaped protrusions 333 extend along the length direction L of the cover plate assembly 1, while the second strip-shaped protrusions 334 extend along the width direction W of the cover plate assembly 1. This arrangement, in other words, the first strip-shaped protrusions 333 and the second strip-shaped protrusions 334 are arranged perpendicularly to each other, thereby enhancing the overall support strength of the first raised portion 33.

[0098] However, the present invention is not limited thereto. In other embodiments, the first raised portion 33 may also be a grid structure; or, the first raised portion 33 may include a plurality of columnar protrusions, which are arranged in an array; or, the first raised portion 33 may include a plurality of strip-shaped protrusions, which extend in the same direction and are arranged at intervals.

[0099] In this embodiment, a thermal insulation layer 40 is further disposed between the first raised portion 33 and the connecting plate 12. The thermal insulation layer 40 covers the surface of the first raised portion 33, and its orthographic projection along the height direction H of the cover plate assembly 1 covers the first raised portion 33. Thus, by covering the surface of the first raised portion 33 with the thermal insulation layer 40, the beneficial technical effect of heat insulation is achieved, thereby mitigating the melting of the first raised portion 33 caused by the high welding temperature. Furthermore, the thermal insulation layer 40 is attached to the surface of the first raised portion 33, or the thermal insulation layer 40 is applied to the surface of the first raised portion 33.

[0100] In this embodiment, a portion of the first transition region 123 is bent toward the electrode assembly to form a second accommodating space 128 for accommodating the first protrusion 33. Thus, by bending a portion of the first transition region 123 toward the electrode assembly to form the second accommodating space 128 for accommodating the first protrusion 33, the heat generated by welding the tabs can be prevented from burning the insulating member 30, and the connecting plate 12 can be made more flat.

[0101] Preferably, the first transition region 123 forms a bent portion in the bent area, and the bent portion includes a first bent portion 1291 and a second bent portion 1292 that are bent in different directions and connected to each other; the first bent portion 1291 and the second bent portion 1292 are both obliquely bent; and the bending positions of the first bent portion 1291 and the second bent portion 1292 are both rounded. In this way, by providing the bent portion including the first bent portion 1291 and the second bent portion 1292 that are bent in different directions and connected to each other to form a Z-shaped bending structure, the physical structure required to form the accommodation space can be minimized, thereby making the overall structure more compact. By providing the first bent portion 1291 and the second bent portion 1292 with oblique bends, the connection reliability at the bend can be better guaranteed compared to right-angle bends that are prone to stress concentration, and the mechanical properties are better. By setting the bending positions of the first bending portion 1291 and the second bending portion 1292 to be rounded, the risk of breakage caused by stamping metal is reduced, and the arc surface transition formed by the rounded corners can improve the connection strength of the components, thereby reducing the risk of connection failure of the connecting plate 12 under extreme working conditions such as vibration and impact, and greatly improving the structural reliability.

[0102] Preferably, the second transition region 124 is provided with a weight-reducing through-hole 127 penetrating along the height direction H of the cover assembly 1, and the weight-reducing through-hole 127 is a closed structure; along the length direction L of the cover assembly 1, the side wall of the weight-reducing through-hole 127 close to the first side 1201 overlaps with the side of the avoidance portion 125 away from the first side 1201, and the side of the avoidance portion 125 away from the first side 1201 and the side of the insulating part 30 facing the electrode assembly are surrounded to form a second outlet 1261 of the liquid guide channel 126; along the width direction W of the cover assembly 1, the size b1 of the avoidance portion 125 is less than or equal to the size of the weight-reducing through-hole 127, and greater than or equal to the size of the injection hole 23.

[0103] In this way, by setting a weight-reducing through hole 127 in the second transition region 124, that is, by performing a weight-reducing treatment on the connecting plate 12, the beneficial technical effect of reducing the overall weight and improving the energy density of the battery is achieved. Furthermore, by setting the specific position of the weight-reducing through hole 127 so that the side wall of the weight-reducing through hole 127 close to the first side 1201 overlaps with the side of the avoidance portion 125 away from the first side 1201, the weight-reducing through hole 127 can be set as close to the avoidance portion 125 as possible, thereby maximizing the area of the weight-reducing through hole 127 and achieving the beneficial technical effect of further weight reduction; at the same time, the side of the avoidance portion 125 away from the first side 1201 and the side of the insulating member 30 facing the electrode assembly are surrounded to form the second outlet 1261 of the liquid guide channel 126, thereby forming more liquid guide outlets, and the electrolyte can flow along Figure 10The double-arrowed direction in the figure indicates that the electrolyte flows out from both sides of the relief portion 125, facilitating faster drainage. Furthermore, by setting the dimension b1 of the relief portion 125 along the width direction W of the cover plate assembly 1 to be less than or equal to the dimension of the weight-reducing through-hole 127 and greater than or equal to the dimension of the injection hole 23, the relief portion 125 can guide the electrolyte flowing out of the injection hole 23 while avoiding interference with the connection between the tab connection area 122 and the tab. Furthermore, the relief portion 125, similar to a reinforcing rib structure, can also have a certain beneficial effect on the overall structural strength of the connecting plate 12.

[0104] One of the two electrode terminals 10 is a positive electrode terminal 101, and the other is a negative electrode terminal 102. In this embodiment, because the injection hole 23 is located only on the side close to the positive electrode terminal 101, a relief portion 125 is provided on the positive electrode terminal 101. In other embodiments, depending on the location of the injection hole 23, the relief portion 125 may be provided on the negative electrode terminal 102, or on both the positive electrode terminal 101 and the negative electrode terminal 102.

[0105] When the electrode terminal 10 is a positive electrode terminal 101, the size c1 of the avoidance portion 125 along the length direction L of the cover plate assembly 1 is 3mm-7mm; when the electrode terminal 10 is a negative electrode terminal 102, the size of the avoidance portion along the length direction L of the cover plate assembly 1 is 2mm-7mm.

[0106] Thus, by setting a range of dimensions for the relief portion 125 along the length direction L of the cover plate assembly 1, the following measures are taken: 1. A dimension that is too small, thereby preventing effective connection between the two tab connection areas 122 and thus failing to ensure the overall strength and stability of the structure, and 2. 3. A dimension that is too large, thereby reducing the area of the weight-reducing through-hole 127, is avoided; 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. 52. 53. 49. 54. 55. 56. 57. 58. 59. 60. 61. The diameter of the second through hole 35 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 is located in the second through hole 35 .

[0107] 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.

[0108] 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.

[0109] In this embodiment, by setting the first side edge 1201 of the connecting plate 12 away from the through portion 11 so that the positive projection portion along the height direction H of the cover plate assembly 1 is located within the first through hole 31, the size of the connecting plate 12 along the length direction L can be effectively controlled, so that the length of the connecting plate 12 is limited to a suitable range, which can effectively improve material utilization and reduce weight while ensuring the parallelism and flatness of the connecting plate 12; and, by setting the avoidance portion 125, a liquid guide channel 126 is formed. Even when the tab is tightly sucked onto the connecting plate 12, the electrolyte can still flow out from the injection hole 23 through the liquid guide channel 126 to the outside of the connecting plate 12, thereby ensuring the normal electrolyte injection. At the same time, the structure of the avoidance portion 125 can increase the area of the connecting plate 12, which has a positive gain in heat dissipation.

[0110] Example 2

[0111] like Figure 12 As shown, the overall structure of the cover assembly 1 and the single cell containing it in this embodiment is basically the same as the structure in Example 1, the difference is that the insulating member 30 is provided with a second protrusion 34 protruding toward the electrode assembly on the side facing the electrode assembly.

[0112] The second protrusion 34 is arranged on the outside of the first through hole 31 along the length direction L of the cover assembly 1, and is spaced apart from the avoidance portion 125 of the connecting plate 12; along the length direction L of the cover assembly 1, the second protrusion 34 is arranged on the outside of the first side edge 1201 of the connecting plate 12, and the second protrusion 34 is arranged in the weight-reducing through hole 127.

[0113] Thus, by disposing the second protrusion 34 outside the first side 1201 of the connecting plate 12, the electrode liquid can be prevented from flowing toward the vent area 36 provided on the insulating member 30 corresponding to the explosion-proof valve 60, thereby preventing the electrolyte from flowing from the vent area 36 to the explosion-proof valve 60 and affecting the normal operation of the explosion-proof valve 60. By disposing the second protrusion 34 within the weight-reducing through-hole 127, the electrode liquid can be prevented from flowing into the recessed portion 111 on the side of the through-portion 11 facing the electrode assembly, which is recessed away from the electrode assembly and affects the electrolyte storage capacity in the electrode assembly.

[0114] But not limited to this, in other embodiments, the second protrusion 34 may also be only provided on the outside of the first side 1201 of the connecting plate 12; or, the second protrusion 34 may also be only provided in the weight-reducing through hole 127, which can be adjusted according to design requirements.

[0115] 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, 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, the connecting plate being located on a side of the cover body facing the electrode assembly, and the insulating member being located between the cover body and the connecting plate; Along the length direction of the cover plate assembly, the connecting plate includes a first side away from the through portion, and the orthographic projection of the first side along the height direction of the cover plate assembly is located within the first through hole; The connecting plate is provided with an avoidance portion at a position corresponding to the first through hole, and the avoidance portion is recessed toward a side of the insulating member away from the insulating member to form a liquid conduction channel, and the first side edge and the side of the insulating member toward the electrode assembly are surrounded to form a first outlet of the liquid conduction channel.

2. The cover plate assembly according to claim 1, wherein: A first accommodation space is provided on a side of the insulating member facing the electrode assembly and is recessed away from the electrode assembly, and the connecting plate is located in the first accommodation space; Along the height direction of the cover plate assembly, a distance from a side of the avoidance portion facing the electrode assembly to a bottom wall of the first accommodating space is smaller than a depth of the first accommodating space at the avoidance portion.

3. The cover plate assembly according to claim 1, wherein: Along the height direction of the cover plate assembly, the thickness of the avoidance portion is less than the thickness of the connecting plate and is greater than or equal to 0.7 mm; along the width direction of the cover plate assembly, the size of the avoidance portion is 9.4 mm-18 mm; and / or, Along the height direction of the cover plate assembly, the depth of the liquid guide channel is 2.4mm-3.6mm; along the width direction of the cover plate assembly, the size of the liquid guide channel is 8mm-16.6mm.

4. The cover plate assembly according to claim 3, wherein: Along the height direction of the cover plate assembly, the thickness of the avoidance portion is 38%-58% of the thickness of the connecting plate; and / or, Along the width direction of the cover plate assembly, the size of the avoidance portion is 22%-43% of the size of the connecting plate.

5. The cover plate assembly according to claim 1, wherein: Along the length direction of the cap plate assembly, 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 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; 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 avoidance portion is provided in the second transition region, and one side of the avoidance portion overlaps with the first side edge of the connecting plate.

6. The cover plate assembly according to claim 5, wherein: A portion of the insulating member on a side facing the electrode assembly protrudes toward the electrode assembly to form a 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 a second limiting portion, wherein the second limiting portion is located in the first transition region; or, A partial area on the side of the insulating part facing the electrode assembly is recessed in a direction away from the electrode assembly to form a second limiting portion, and a partial area on the side of the connecting plate facing the insulating part protrudes in a direction close to the insulating part to form a first limiting portion, and the first limiting portion is located in the first transition area.

7. The cover plate assembly according to claim 6, 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.

8. The cover plate assembly according to claim 5, wherein: A first protrusion is provided on one side of the insulating member facing the connecting plate and protruding toward the connecting plate, wherein the orthographic projection of the first protrusion along the height direction of the cover plate assembly is located within the outer edge of the connecting plate; The number of the first protrusions is set to correspond to the number of the tab connection areas, and the orthographic projection of each first 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 8, wherein: A portion of the first transition region is bent toward the electrode assembly to form a second accommodating space for accommodating the first protrusion.

10. The cover plate assembly according to claim 9, wherein: The first transition region forms a bending portion in the bending region, and the bending portion includes a first bending portion and a second bending portion that are bent in different directions and connected; The first bending portion and the second bending portion are both obliquely bent; and / or, the bending positions of the first bending portion and the second bending portion are both rounded.

11. The cover plate assembly according to claim 5, wherein: The second transition region is provided with a weight-reducing through-hole penetrating along the height direction of the cover plate assembly, and the weight-reducing through-hole is a closed structure; along the length direction of the cover plate assembly, the sidewall of the weight-reducing through-hole close to the first side overlaps with the side of the avoidance portion away from the first side, and the side of the avoidance portion away from the first side and the side of the insulating member facing the electrode assembly enclose a second outlet of the liquid guide channel; Along the width direction of the cover plate assembly, the size of the avoidance portion is smaller than or equal to the size of the weight-reducing through hole, and larger than or equal to the size of the liquid injection hole.

12. The cover plate assembly according to claim 11, wherein: When the electrode terminal is a positive electrode terminal, the size of the avoidance portion along the length direction of the cover assembly is 3 mm to 7 mm; When the electrode terminal is a negative electrode terminal, a size of the avoidance portion is 2 mm to 7 mm along the length direction of the cover assembly.

13. The cover plate assembly according to claim 11, wherein: A second protrusion is provided on a side of the insulating member facing the electrode assembly and protrudes toward the electrode assembly. The second protrusion is provided on the outside of the first through hole along the length direction of the cover plate assembly and is spaced apart from the avoidance portion of the connecting plate. Along the length direction of the cover plate assembly, the second protrusion is arranged on the outer side of the first side of the connecting plate, and / or the second protrusion is arranged in the weight-reducing through hole.

14. A single cell battery, characterized in that: It includes: case; The cover plate assembly according to any one of claims 1 to 13, 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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