Cover plate assembly and single cell

Abstract

The utility model discloses a kind of cover plate assembly and single battery, comprising: cover plate, including cover plate body and first reinforcing structure, first reinforcing structure includes the first protruding portion and first recess portion being located at the opposite sides of cover plate along first direction, first protruding portion protrudes from the one side surface of cover plate body along first direction, and first reinforcing structure is equipped with pole hole, first direction is the thickness direction of cover plate;First protruding portion and first recess portion are oppositely arranged, and the extension size L2 of first protruding portion along second direction is not less than the extension size L1 of first recess portion along second direction, second direction is the length direction of cover plate.The recess thickness of the cover plate in the position of first recess portion can be kept consistent, and the protruding height of first protruding portion will not be too high, to avoid the local thickness of cover plate to be thinned, the structural strength of cover plate in pole hole position can be improved, cover plate is not prone to deformation when heated and stressed, and then the sealing effect and safety of single battery can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate assembly and a single battery cell. Background Technology

[0002] In related technologies, a single-cell battery typically consists of a cover, a casing, and a battery cell. The battery cell is housed within the casing, and the cover is connected to the casing to seal it. However, due to the unreasonable structural design of the cover in these technologies, the structural strength of the cover at the terminal hole is low. During battery safety testing, the terminal hole of the cover is prone to deformation under heat and stress, leading to sealing failure of the cover and casing, electrolyte leakage, and poor battery safety performance. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, one objective of this invention is to provide a cover plate assembly. This cover plate, by providing a first reinforcing structure at the position of the electrode post hole, ensures that the extension dimension L2 of the first protrusion along the second direction is not less than the extension dimension L1 of the first recess along the second direction. This allows the recess thickness of the cover plate at the first recess position to remain consistent, and the protrusion height of the first protrusion is not excessive, thus preventing localized thinning of the cover plate. This effectively improves the structural strength of the cover plate at the electrode post hole position, making the cover plate less prone to deformation under heat and stress, thereby improving the sealing effect and safety of the individual battery cell.

[0004] This invention also proposes a single-cell battery having the above-mentioned cover plate assembly.

[0005] To achieve the above objectives, a cover plate assembly is provided according to a first aspect of the present invention, comprising: a cover plate, the cover plate including a cover plate body and a first reinforcing structure, the first reinforcing structure including a first protrusion and a first recess disposed on opposite sides of the cover plate along a first direction, the first protrusion protruding from one side surface of the cover plate body along the first direction, and the first reinforcing structure having a post hole, the first direction being the thickness direction of the cover plate; wherein, the first protrusion and the first recess are disposed opposite to each other, and the extension dimension L2 of the first protrusion along a second direction is not less than the extension dimension L1 of the first recess along the second direction, the second direction being the length direction of the cover plate.

[0006] According to the present invention, the cover plate assembly provides a first reinforcing structure at the position of the electrode hole, and the extension dimension L2 of the first protrusion along the second direction is not less than the extension dimension L1 of the first recess along the second direction. In this way, the recess thickness of the cover plate at the first recess position can be kept consistent, and the protrusion height of the first protrusion will not be too high, so as to avoid local thinning of the cover plate. This can effectively improve the structural strength of the cover plate at the position of the electrode hole, and the cover plate is less prone to deformation when heated and stressed, thereby improving the sealing effect and safety of the battery.

[0007] According to some embodiments of the present invention, the first recess is constructed as a groove, and the volume of the space formed by the bottom wall of the groove and the side wall of the groove is V1, the volume of the first protrusion protruding from the cover plate body along the first direction is V2, and V1≥V2.

[0008] According to some embodiments of the present invention, the recessed size of the first recessed portion in the first direction is T1, the protrusion of the first protrusion of the cover plate body in the first direction is T2, and the thickness of the cover plate body in the first direction is T3; wherein, 0.2≤T1 / T3≤0.5, 0.15≤T2 / T3≤0.45.

[0009] According to some embodiments of the present invention, the cover plate further includes a second reinforcing structure, the second reinforcing structure including a second protrusion and a second recess disposed on opposite sides of the cover plate along the first direction, the second reinforcing structure and the first reinforcing structure being arranged at intervals along the second direction; wherein the first protrusion and the second protrusion are disposed on the same side of the cover plate, and the first recess and the second recess are disposed on the same side of the cover plate.

[0010] According to some embodiments of this utility model, the cover plate is further provided with an injection hole and an explosion-proof hole. There are two first reinforcing structures, and the pole holes on the first reinforcing structure are respectively a first pole hole and a second pole hole. The first pole hole, the injection hole, the explosion-proof hole and the second pole hole are arranged at intervals along the second direction. Among them, the first pole hole is provided with at least one second reinforcing structure on the side of the second direction away from the injection hole; and / or, at least one second reinforcing structure is provided between the injection hole and the explosion-proof hole; and / or, at least one second reinforcing structure is provided between the explosion-proof hole and the second pole hole; and / or, the second pole hole is provided with at least one second reinforcing structure on the side of the second direction away from the explosion-proof hole.

[0011] According to some embodiments of the present invention, the cover plate assembly further includes: a pole post, the pole post passing through the pole post hole and along the first direction, the two ends of the pole post being located on both sides of the cover plate, at least a portion of the first reinforcing structure being located between the two ends of the pole post, and the pole post and the cover plate being connected by an insulating sealing structure.

[0012] According to some embodiments of the present invention, the insulating sealing structure includes an insulating member disposed between the cover plate and the pole post. The insulating member includes an insulating member body and a mating part. The insulating member body is adapted to the cover plate body, and the mating part is adapted to at least the first reinforcing structure. Specifically, along the first direction, the gap between the upper surface of the first reinforcing structure and the mating part is B1, and B1 > 0.1 mm; and / or, along the radial direction of the pole post hole, the gap between the first reinforcing structure and the sidewall of the mating part is B2, and B2 > 0.3 mm.

[0013] According to a second aspect of the present invention, a single-cell battery is provided, the single-cell battery including a cover plate assembly as described in the first aspect of the present invention; an electrode assembly including tabs and adapter pieces, the adapter piece being disposed on the side of the cover plate assembly facing the electrode assembly and including a terminal post connecting section and a tab connecting section, the terminal post connecting section being connected to the terminal post, the tab connecting section being connected to the terminal post, the tab connecting section being connected to both sides of the terminal post connecting section, and the tab connecting section protruding relative to the terminal post connecting section along a first direction toward the cover plate assembly; wherein, the maximum distance between the terminal post connecting section and the cover plate in the first direction is a, the maximum protrusion height of the tab connecting section relative to the terminal post connecting section in the first direction is b, and a and b satisfy the relationship: 0.4 ≤ b / a < 1.

[0014] According to the second aspect of the present invention, the single battery utilizes the cover plate assembly according to the first aspect of the present invention. By providing a first reinforcing structure at the position of the electrode hole, and ensuring that the extension dimension L2 of the first protrusion along the second direction is not less than the extension dimension L1 of the first recess along the second direction, the recess thickness of the cover plate at the first recess position can be kept consistent, and the protrusion height of the first protrusion will not be too high, so as to avoid local thinning of the cover plate. This effectively improves the structural strength of the cover plate at the position of the electrode hole, and the cover plate is less prone to deformation when heated and stressed, thereby improving the sealing effect and safety of the single battery.

[0015] According to some embodiments of the present invention, the electrode connecting section includes at least one stepped portion, wherein the orthographic projection of the stepped portion located at the end of the electrode connecting section along the width direction of the cover plate along the first direction falls on the cover plate body.

[0016] According to some embodiments of the present invention, the electrode connecting section includes two stepped portions that are sequentially connected to the electrode connecting section, or one stepped portion that is connected to the electrode connecting section through a bent transition portion.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a structural schematic diagram of the cover plate assembly according to an embodiment of the present utility model; Figure 2 This is a structural schematic diagram of the second surface of the cover plate according to an embodiment of the present utility model; Figure 3 This is a structural schematic diagram of the first surface of the cover plate body according to an embodiment of the present utility model; Figure 4 This is a cross-sectional view of the cover plate according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the cover plate according to an embodiment of the present utility model; Figure 6 yes Figure 5 Sectional view at point AA; Figure 7 This is an assembly diagram of the cover plate assembly and the adapter according to an embodiment of the present utility model; Figure 8 yes Figure 7 Sectional view at BB; Figure 9 This is an assembly diagram of the cover plate assembly and adapter according to another embodiment of the present utility model; Figure 10 This is a structural schematic diagram of the adapter according to an embodiment of the present utility model; Figure 11 This is a structural schematic diagram of an adapter according to another embodiment of the present invention.

[0019] Figure label: 1. Cover plate assembly; 100. Cover plate; 101. First surface; 102. Second surface; 110. First reinforcing structure; 111. First protrusion; 112. First recess; 114. Second reinforcing structure; 115. Second protrusion; 116. Second recess; 120. Pole post hole; 121. First pole post hole; 122. Second pole post hole; 130. Injection hole; 140. Explosion-proof hole; 150. Cover plate body; 210. Terminal post; 211. First terminal post; 212. Second terminal post; 213. Main body; 214. Stop; 230. Injection assembly; 240. Riveting part; 250. Seal; 300. Insulating component; 310. First insulating component; 320. Second insulating component; 321. Mating part; 322. Insulating body; 500, Adapter piece; 501, First side surface; 502, Second side surface; 510, Pole post connecting section; 520, Pole lug connecting section; 521, Stepped section; 522, First stepped section; 523, Second stepped section; 524, Bending transition section. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0023] In the description of this utility model, "multiple" means two or more, and "several" means one or more.

[0024] The cover plate assembly 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings. The cover plate assembly 1 can be applied to a single battery cell and is installed on the housing of the single battery cell.

[0025] like Figures 1-11 As shown, the cover plate assembly 1 includes a cover plate 100, which includes a cover plate body 150 and a first reinforcing structure 110. The first reinforcing structure 110 includes a first protrusion 111 and a first recess 112 disposed on opposite sides of the cover plate 100 along a first direction. The first reinforcing structure 110 can be integrally formed by stamping. The first protrusion 111 protrudes from one side surface of the cover plate body 150 along the first direction, and the first reinforcing structure 110 is provided with an electrode post hole 120. The first direction is the thickness direction of the cover plate 100, which is also the height direction of the single battery cell.

[0026] Specifically, the cover plate 100 has a first surface 101 and a second surface 102 disposed on opposite sides in a first direction. A first protrusion 111 is disposed on one of the first surface 101 and the second surface 102, and a first recess 112 is disposed on the other of the first surface 101 and the second surface 102, with the first recess 112 and the first protrusion 111 disposed opposite to each other. The first surface 101 of the cover plate 100 can be the outer side of the cover plate 100, and the second surface 102 of the cover plate 100 can be the inner side of the cover plate 100.

[0027] The cover plate 100 used in this embodiment of the utility model can be 2.5mm thick, which can solve the problems of compressed internal space of the battery and increased battery cost and weight.

[0028] The first protrusion 111 protrudes from one side surface of the cover plate body 150 along the first direction, meaning that the first protrusion 111 can protrude from the side of the cover plate body 150 facing the battery cell, or the first protrusion 111 can protrude from the side of the cover plate body 150 away from the battery cell.

[0029] Furthermore, the first protrusion 111 and the first recess 112 are disposed opposite to each other, and the extension dimension L2 of the first protrusion 111 along the second direction is not less than the extension dimension L1 of the first recess 112 along the second direction, where the second direction is the length direction of the cover plate 100. In the attached figures, the z-direction is the first direction, the x-direction is the second direction, and the y-direction is the third direction.

[0030] According to the cover plate assembly 1 of this utility model embodiment, by providing a first reinforcing structure 110 on the cover plate 100, the first reinforcing structure 110 includes a first protrusion 111 and a first recess 112 disposed on opposite sides of the cover plate 100 along a first direction, and the first protrusion 111 of the first reinforcing structure 110 protrudes from one side surface of the cover plate body 150 along the first direction, that is, the first reinforcing structure 110 can form a reinforcing rib structure, and the surface of the cover plate 100 is a non-planar structure, thereby improving the overall structural strength of the cover plate 100, so that the cover plate 100 is less prone to deformation when heated and stressed. Even if the cover plate 100 adopts a thinner design, the overall structural strength of the cover plate 100 can be guaranteed, thereby enabling the battery to have multiple advantages such as high safety performance and the cover plate 100 not compressing the internal space of the battery.

[0031] Furthermore, the cover plate 100 has a terminal hole 120 constructed on the first reinforcing structure 110. This arrangement ensures that the cover plate 100 has a reinforcing rib structure at the terminal hole 120 position, thereby improving the structural strength of the cover plate 100 at the terminal hole 120 position. In other words, the cover plate 100 of this embodiment can specifically strengthen the structural strength at the terminal hole 120 position, and the cover plate 100 at the terminal hole 120 position can have a stronger load-bearing capacity under stress and heat, more effectively avoiding the problem of sealing failure caused by deformation of the cover plate 100 at the terminal hole 120 position under stress and heat, and thus improving the safety performance of the battery.

[0032] Furthermore, the extension dimension L2 of the first protrusion 111 along the second direction is not less than the extension dimension L1 of the first recess 112 along the second direction. That is, the dimension of the first protrusion 111 along the radial direction of the pole hole 120 can be greater than the dimension of the first recess 112 along the radial direction of the pole hole 120. In other words, the orthographic projection of the first recess 112 along the first direction can completely fall within the orthographic projection of the first protrusion 111. With this configuration, the first recess 112 can completely correspond to the first protrusion 111. As long as the cover plate 100 has the position of the first recess 112, the other side of the cover plate 100 along the first direction will have the corresponding first protrusion 111, thereby avoiding local thinning of the cover plate 100 at the position where the first recess 112 is located.

[0033] Furthermore, it is understandable that when the volume of the first protrusion 111 protruding from the cover plate body 150 is constant, the smaller the extension dimension L2 of the first protrusion 111 along the second direction, the higher the protrusion height of the first protrusion 111 along the first direction needs to be. By ensuring that the extension dimension L2 of the first protrusion 111 along the second direction is not less than the extension dimension L1 of the first recess 112 along the second direction, i.e., the extension dimension L2 of the first protrusion 111 along the second direction can be larger, the protrusion height of the first protrusion 111 can be avoided to be too high, the structural setting is more reasonable, and the structural strength of the cover plate 100 can be effectively improved.

[0034] Thus, according to the embodiment of the present invention, the cover plate assembly 1 provides a first reinforcing structure 110 at the position of the electrode hole 120, and makes the extension dimension L2 of the first protrusion 111 along the second direction not less than the extension dimension L1 of the first recess 112 along the second direction. In this way, the recess thickness of the cover plate 100 at the position of the first recess 112 can be kept consistent, and the protrusion height of the first protrusion 111 will not be too high, so as to avoid the local thickness of the cover plate 100 becoming thinner. This can effectively improve the structural strength of the cover plate 100 at the position of the electrode hole 120, and the cover plate 100 is less likely to deform when heated and subjected to force, thereby improving the sealing effect and safety of the battery.

[0035] In some specific embodiments of this utility model, such as Figure 6 As shown, the first recess 112 is constructed as a groove, and the volume of the space formed by the bottom wall and the side wall of the groove is V1. The volume of the first protrusion 111 protruding from the cover plate body 150 along the first direction is V2, and V1 ≥ V2. By setting the volume V1 of the first protrusion 111 to be no greater than the volume V2 of the first recess 112, the volume of the first protrusion 111 protruding from the cover plate body 150 can be avoided from being too large. The dimensions of the first protrusion 111 along the first direction and the second direction will not be too large, thereby avoiding the first protrusion 111 from excessively occupying the internal space of the single battery casing, which is conducive to reducing the volume of the casing and thus avoiding the single battery from being too large.

[0036] In some specific embodiments of this utility model, such as Figure 6 As shown, the recessed portion 112 has a recessed dimension of T1 in the first direction, the first protrusion 111 protrudes from the cover plate body 150 by a dimension of T2 in the first direction, and the thickness of the cover plate body 150 in the first direction is T3.

[0037] Where 0.2 ≤ T1 / T3 ≤ 0.5. For example, T1 / T3 can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, or 0.5. Of course, the ratio of T1 / T3 can also be any value between 0.2 and 0.5.

[0038] By setting T1 / T3 to be no less than 0.2, the recess size of the first recess 112 can be made larger, thereby effectively improving the structural strength of the cover plate 100. In addition, by setting T1 / T3 to be no greater than 0.5, the recess size of the first recess 112 can be prevented from being too large, which would cause the first protrusion 111 to protrude too much in the first direction, thereby preventing the first reinforcing structure 110 from occupying too much internal space of the shell.

[0039] Additionally, 0.15 ≤ T2 / T3 ≤ 0.45, where T2 / T3 can be 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, or 0.45. Of course, the ratio of T2 / T3 can also be any value between 0.15 and 0.45.

[0040] By setting T2 / T3 to not less than 0.15, the protrusion height of the first protrusion 111 along the first direction can be relatively large, so as to effectively improve the structural strength of the cover plate 100 by using the first protrusion 111. Furthermore, by setting T2 / T3 to not more than 0.45, the protrusion size of the first protrusion 111 in the first direction can be avoided from being too large, so as to avoid the first reinforcing structure 110 from excessively occupying the internal space of the shell.

[0041] In some specific embodiments of this utility model, such as Figure 1-5 As shown, the cover plate 100 also includes a second reinforcing structure 114. The second reinforcing structure 114 includes a second protrusion 115 and a second recess 116 disposed on opposite sides of the cover plate 100 along a first direction. The second reinforcing structure 114 and the first reinforcing structure 110 are arranged at intervals along a second direction.

[0042] By setting the first reinforcing structure 110 and the second reinforcing structure 114, not only can the first reinforcing structure 110 be used to strengthen the position of the terminal hole 120, but also multiple second reinforcing structures 114 can be used to strengthen the remaining positions of the cover plate 100. Thus, the first reinforcing structure 110 and the second reinforcing structure 114 can be used to more effectively improve the overall structural strength of the cover plate 100, making the cover plate 100 less prone to deformation when heated and stressed. This allows the battery to have both high safety performance and the advantage that the cover plate 100 does not compress the internal space of the battery.

[0043] Among them, such as Figure 1-5 As shown, the first protrusion 111 and the second protrusion 115 are provided on the same side of the cover plate 100, and the first recess 112 and the second recess 116 are provided on the same side of the cover plate 100.

[0044] In other words, when the first protrusion 111 protrudes from the first surface 101 of the cover plate 100, the second protrusion 115 also protrudes from the first surface 101 of the cover plate 100, and the first recess 112 and the second recess 116 are both located on the second surface 102 of the cover plate 100. Alternatively, when the first protrusion 111 protrudes from the second surface 102 of the cover plate 100, the second protrusion 115 also protrudes from the second surface 102 of the cover plate 100, and the first recess 112 and the second recess 116 are both located on the first surface 101 of the cover plate 100.

[0045] This configuration allows the first reinforcing structure 110 and the second reinforcing structure 114 to be simultaneously formed by stamping during processing, simplifying the processing steps and improving the processing efficiency of the cover plate 100. Furthermore, this configuration prevents the first protrusion 111 and the second protrusion 115 from protruding from opposite sides of the cover plate 100, thus avoiding excessive overall thickness of the cover plate 100 and further preventing excessive overall height of the individual battery cells.

[0046] In some specific embodiments of this utility model, such as Figure 1-3 As shown, the cover plate 100 is also provided with an injection hole 130 and an explosion-proof hole 140. The cover plate assembly 1 is provided with an injection assembly 230 and an explosion-proof assembly, and the injection assembly 230 is disposed in the injection hole 130. There are two first reinforcing structures 110, and the pole post holes 120 on the first reinforcing structure 110 are respectively the first pole post 211 hole and the second pole post 212 hole. The first pole post 211 hole, the injection hole 130, the explosion-proof hole 140, and the second pole post 212 hole are arranged at intervals along the second direction.

[0047] Wherein, the first pole post 211 hole is provided with at least one second reinforcing structure 114 on the side opposite to the injection hole 130 in the second direction; and / or, at least one second reinforcing structure 114 is provided between the injection hole 130 and the explosion-proof hole 140; and / or, at least one second reinforcing structure 114 is provided between the explosion-proof hole 140 and the second pole post 212 hole; and / or, the second pole post 212 hole is provided with at least one second reinforcing structure 114 on the side opposite to the explosion-proof hole 140 in the second direction.

[0048] Therefore, in addition to the first reinforcing structure 110 provided at the terminal hole 120, multiple second reinforcing structures 114 can also be evenly distributed at other locations of the cover plate 100. This effectively improves the overall structural strength of the cover plate 100 by utilizing multiple second reinforcing structures 114. The cover plate 100 is less prone to deformation when heated and subjected to stress, resulting in better sealing and higher battery safety performance.

[0049] Furthermore, with this configuration, the cover plate 100 can be constructed as a corrugated cover plate with multiple reinforcing structures. Compared with a flat thin plate structure, the cover plate 100 of this utility model can withstand greater external loads and has higher bending stiffness, thus making it less prone to warping deformation. In addition, the corrugated cover plate with reinforcing structures can change the geometry of the cover plate 100, thereby improving the structural strength of the cover plate 100 and making the cover plate 100 less prone to deformation.

[0050] Furthermore, multiple uniformly distributed first reinforcing structures 110 and second reinforcing structures 114 can divide the entire cover plate 100 into multiple smaller continuous regions. Compared to a single large-span cover plate 100, the first reinforcing structures 110 and second reinforcing structures 114 of the cover plate 100 of this utility model can play the role of supporting the boundary. When a load is applied to any small region, the force transmission path will be shortened, and the cover plate 100 can quickly transmit the force to the surrounding high-rigidity reinforcing structures. Then, the reinforcing structures will evenly distribute the force to the periphery of the entire cover plate 100 and the casing of the individual battery, thereby significantly improving the load-bearing capacity of the cover plate assembly 1. This is beneficial to improving the performance of the individual battery in terms of resistance to internal air pressure, external extrusion, and mechanical vibration, thereby enhancing the overall safety and service life of the individual battery.

[0051] Specifically, in some embodiments, a second reinforcing structure 114 may be provided on the side of the first pole post 211 hole facing away from the injection hole 130 in the second direction, a second reinforcing structure 114 may be provided between the injection hole 130 and the explosion-proof hole 140, a second reinforcing structure 114 may be provided between the explosion-proof hole 140 and the second pole post 212 hole, and a second reinforcing structure 114 may be provided on the side of the second pole post 212 hole facing away from the explosion-proof hole 140 in the second direction.

[0052] In some specific embodiments of this utility model, such as Figure 1 and Figure 7 As shown, the cover plate assembly 1 also includes a pole post 210, which passes through the pole post hole 120 and is located on both sides of the cover plate 100 along the first direction. At least a portion of the first reinforcing structure 110 is located between the two ends of the pole post 210. The pole post 210 and the cover plate 100 are connected by an insulating sealing structure, which can seal and insulate the pole post 210 and the cover plate 100.

[0053] The electrode post 210 can be two, including a first electrode post 211 and a second electrode post 212. The first electrode post 211 is located in the hole of the first electrode post 211, and the second electrode post 212 is located in the hole of the second electrode post 212. One of the first electrode post 211 and the second electrode post 212 is the positive electrode post 210, and the other is the negative electrode post 210. Taking the first pole post 211 as an example (the second pole post 212 has the same assembly structure as the first pole post 211), the first pole post 211 may include a main body 213, a stop 214, and a riveting part 240. The radial dimension of the stop 214 may be larger than the radial dimension of the main body 213. The main body 213 passes through the hole of the first pole post 211, and the stop 214 stops on the second surface 102 of the cover plate 100. One end of the main body 213 away from the stop 214 protrudes from the first surface 101 of the cover plate 100. The riveting part 240 is provided on one side of the first surface 101 of the cover plate 100, and the riveting part 240 is riveted to the main body 213 to fix the first pole post 211 and the cover plate 100 relative to each other.

[0054] In some specific embodiments of this utility model, such as Figure 6 As shown, the insulating sealing structure includes an insulating element 300, which is disposed between the cover plate 100 and the pole post 210. Furthermore, a portion of the insulating element 300 may be disposed between the riveting portion 240 of the cover plate 100 and the cover plate 100. For example, the insulating element 300 includes a first insulating element 310 and a second insulating element 320. The first insulating element 310 may be disposed between the riveting portion 240 and the cover plate 100, so that the riveting portion 240 can press the first insulating element 310 in a first direction, so that the first insulating element 310 can maintain a tight fit with the first surface 101.

[0055] The first insulating member 310 and the second insulating member 320 can be integrally formed or configured as separate structures. Specifically, the first insulating member 310 is fixed to the cover plate 100 and located on one side of the cover plate 100 along the first direction, and the second insulating member 320 is fixed to the cover plate 100 and located on the other side of the cover plate 100 along the first direction. For example, the first insulating member 310 is the upper insulating member and the second insulating member 320 is the lower insulating member. In this way, the first insulating member 310 and the second insulating member 320 can be located on opposite sides of the cover plate 100 in the thickness direction. There can be two first insulating members 310, which are respectively sleeved on the first pole post 211 and the second pole post 212, and there can also be two second insulating members 320, which are respectively sleeved on the first pole post 211 and the second pole post 212.

[0056] In addition, the second insulating member 320 is provided with a mating portion 321 that matches the shape of the reinforcing structure. The mating portion 321 protrudes from one side surface of the second insulating member 320 along a first direction. At least a portion of the mating portion 321 is used to accommodate the reinforcing structure, or at least a portion of the reinforcing structure is used to accommodate the mating portion 321.

[0057] In addition, the insulating sealing structure may also include a sealing element 250, which is sleeved on the main body 213. The side of the sealing element 250 adjacent to the first surface 101 can abut against the first insulating element 310, and the side of the sealing element 250 adjacent to the second surface 102 can abut against the stop portion 214, thereby realizing the sealed assembly of the first pole post 211.

[0058] In some specific embodiments of this utility model, such as Figure 6 As shown, the insulating member 300 includes an insulating member 300 body and a mating part 321. The insulating member 300 body is adapted to the cover plate body 150, and the mating part 321 is adapted to at least the first reinforcing structure 110. For example, the first insulating member 310 and the second insulating member 320 may each include an insulating body 322 and a mating part 321. The mating part 321 may accommodate the first protrusion 111, or the first recess 112 may accommodate the mating part 321.

[0059] For example, when the first protrusion 111 is provided on the second surface 102, the mating portion 321 can be constructed as a groove on the side of the second insulating member 320 facing the cover plate 100, and the first protrusion 111 can correspond to the groove and at least partially extend into the groove. Alternatively, when the first recess 112 is provided on the second surface 102, the mating portion 321 can be constructed as a protrusion on the side of the second insulating member 320 facing the cover plate 100, and the protrusion can correspond to the first recess 112 and at least partially extend into the first recess 112. This can improve the fit between the insulating member 300 and the second surface 102 of the cover plate 100, making the structural assembly of the insulating member 300 and the cover plate 100 more compact, and further reducing the overall thickness of the cover plate assembly 1.

[0060] Among them, such as Figure 6 As shown, along the first direction, the gap between the first reinforcing structure 110 and the upper surface of the mating part 321 is B1, and B1 > 0.1 mm; and / or, along the radial direction of the pole hole 120, the gap between the first reinforcing structure 110 and the side wall of the mating part 321 is B2, and B2 > 0.3 mm.

[0061] Specifically, when the first protrusion 111 is provided on the second surface 102, and the mating part 321 is configured as a groove on the side of the second insulating member 320 facing the cover plate 100, then in the first direction, the gap B1 between the first protrusion 111 and the bottom wall of the groove is greater than 0.1 mm, and the gap B2 between the side wall of the first protrusion 111 and the side wall of the groove is greater than 0.3 mm. When the first recess 112 is provided on the second surface 102, and the mating part 321 is configured as a protrusion on the side of the second insulating member 320 facing the cover plate 100, then in the first direction, the gap B1 between the protrusion and the bottom wall of the first recess 112 is greater than 0.1 mm, and the gap B between the side wall of the protrusion and the side wall of the first recess 112 is greater than 0.3 mm. This configuration not only facilitates the assembly of the cover plate 100 and the second insulating member 320, but also avoids positional interference between the second insulating member 320 and the cover plate 100 due to shrinkage.

[0062] In some embodiments of this utility model, the angle between the sidewall of the first reinforcing structure 110 and the first direction is 5°-15°, and the angle between the sidewall of the mating part 321 and the first direction is also 5°-15°.

[0063] For example, when the first protrusion 111 is provided on the second surface 102, and the mating part 321 is configured as a groove on the side of the second insulating member 320 facing the cover plate 100, the sidewall of the first protrusion 111 has an angle of 5°-15° with the first direction, and the sidewall of the groove also has an angle of 5°-15° with the first direction. Alternatively, when the first recess 112 is provided on the second surface 102, and the mating part 321 is configured as a protrusion on the side of the second insulating member 320 facing the cover plate 100, the sidewall of the first recess 112 has an angle of 5°-15° with the first direction, and the sidewall of the protrusion also has an angle of 5°-15° with the first direction.

[0064] The chamfering design facilitates demolding during the processing of the first reinforcing structure 110 of the cover plate 100, and also reduces stress concentration, thus improving the strength of the cover plate 100. Furthermore, this design ensures that the chamfer of the sidewall of the first reinforcing structure 110 is the same as the chamfer of the sidewall of the mating part 321, guaranteeing uniform gaps between the first reinforcing structure 110 and the mating part 321.

[0065] According to an embodiment of this utility model, a single-cell battery is also proposed.

[0066] The single cell includes a cover plate assembly 1 and an electrode assembly according to the above embodiments of the present invention.

[0067] like Figures 7-11As shown, the electrode assembly includes a tab and an adapter plate 500. The adapter plate 500 is disposed on the side of the cover plate assembly 1 facing the electrode assembly and includes a pole post connecting section 510 and a tab connecting section 520. The pole post connecting section 510 is connected to the pole post 210, and the tab connecting section 520 is connected to the tab. The tab connecting section 520 is connected to both sides of the pole post connecting section 510. The tab connecting section 520 protrudes from the pole post connecting section 510 towards the side of the cover plate assembly 1 in a first direction.

[0068] Among them, such as Figure 8 As shown, the maximum distance between the pole connecting section 510 and the cover plate 100 in the first direction is a, and the maximum protrusion height of the pole connecting section 520 relative to the pole connecting section 510 in the first direction is b. a and b satisfy the relationship: 0.4≤b / a<1.

[0069] The single battery cell includes a casing and a battery cell. The battery cell is disposed inside the casing, and one side of the casing is open in a first direction. The battery cell has a tab on the side corresponding to the open side of the casing. A cover plate assembly 1 is connected to the casing and seals the opening. The cover plate assembly 1 is connected to the battery cell. The cover plate assembly 1 can be fixed to the casing by welding or other methods, thereby making the interior of the casing relatively sealed.

[0070] Specifically, when the adapter piece 500 is applied to a single battery cell, the adapter piece 500 is disposed on the side of the cover plate assembly 1 facing the electrode assembly. The two sides of the adapter piece 500, arranged opposite each other along a first direction, are designated as a first side surface 501 and a second side surface 502, respectively. The first side surface 501 faces the cover plate assembly 1, and the second side surface 502 faces the electrode assembly. The first side surface 501 of the electrode post connecting section 510 is welded and fixed to the electrode post 210. Two tab connecting sections 520 are provided, each connected to one side of the electrode post connecting section 510 along a third direction, which can be the width direction of the cover plate assembly 1. The second side surfaces 502 of the two tab connecting sections 520 on both sides of the electrode post connecting section 510 are welded and fixed to the tabs. It should be noted that the two tab connecting sections 520 can be connected to one side of the electrode post connecting section 510 along a third direction, or they can be connected to one side of the electrode post connecting section 510 along a second direction, and can be selectively configured according to the position of the tabs in the electrode assembly. In embodiments of this utility model, such as... Figures 7-11 As shown, the two tab connecting sections 520 are respectively connected to the two sides of the pole connecting section 510 in a third direction.

[0071] In the prior art, if there is no height difference between the tab connection section 520 and the terminal connection section 510 in the first direction, that is, the adapter piece 500 is a flat adapter piece 500, then after the tab connection section 520 is connected to the tab, the distance between the tab and the cover plate assembly 1 is relatively far, and there is a spare space between the tab connection section 520 and the cover plate assembly 1, which will cause a certain degree of space waste inside the single cell.

[0072] In some embodiments of this utility model, the tab connecting section 520 protrudes from the side of the terminal connecting section 510 facing the cover plate assembly 1 in the first direction. This creates a height difference in the first direction between the terminal connecting section 510 and the tab connecting section 520, bringing the tab connecting section 520 closer to the cover plate assembly 1. Thus, during the manufacturing process of a single battery cell, while maintaining the overall volume of the single battery cell, the height of the portions of the electrode assembly corresponding to both sides of the cover plate assembly 1 in the first direction can be increased. This allows the tabs on both sides of the electrode assembly corresponding to the cover plate assembly 1 in the width direction to be closer to the tab connecting section 520 protruding towards the cover plate assembly 1, resulting in a more stable welding and fixing of the tabs to the tab connecting section 520. This allows the electrode assembly to fully utilize the space created by the tab connecting section 520 protruding towards the cover plate assembly 1, thereby increasing its volume and ultimately improving the cell's capacity.

[0073] Furthermore, the tab connection section 520 protrudes from the side of the terminal connection section 510 facing the cover assembly 1 in the first direction. It is understandable that the tab connection section 520 is closer to the cover assembly 1 in the first direction, which may lead to interference between the tab connection section 520 and the insulating member 300 on the cover assembly 1. When the insulating member 300 presses against the tab connection section 520, it may cause unstable electrical connection between the tab connection section 520 and the tab, resulting in poor overall reliability of the single cell. Therefore, the protrusion of the tab connection section 520 from the side of the terminal connection section 510 facing the cover assembly 1 in the first direction requires controlling the distance between the tab connection section 520 and the insulating member 300 on the cover assembly 1 to ensure that the tab connection section 520 and the insulating member 300 are spaced apart.

[0074] The second insulating member 320 is disposed on the side wall of the cover plate assembly 1 facing the electrode assembly along the first direction. The insulating member 300 is a structure made of plastic material, which can be a plastic frame. The plastic frame is located between the cover plate assembly 1 and the electrode assembly. The plastic frame is used to moderately limit the circumferential movement of the cell of the electrode assembly, preventing the cell from moving along the first direction or along the second or third direction within the housing.

[0075] Therefore, the maximum distance between the pole post connecting section 510 and the cover plate assembly 1 in the first direction is set to a, and the maximum protrusion height of the pole tab connecting section 520 relative to the pole post connecting section 510 in the first direction is set to b. a and b satisfy the relationship: 0.4≤b / a<1.

[0076] Specifically, the first side 501 of both the pole post connecting section 510 and the first side 501 of the tab connecting section 520 are the sides of the adapter piece 500 facing the cover plate 100. The maximum distance between the pole post connecting section 510 and the cover plate assembly 1 in the first direction is 'a', that is, 'a' is the distance between the first side 501 of the pole post connecting section 510 and the cover plate assembly 1 in the first direction. The maximum protrusion height of the tab connecting section 520 relative to the pole post connecting section 510 in the first direction is 'b', that is, 'b' is the maximum protrusion height of the first side 501 of the tab connecting section 520 relative to the first side 501 of the pole post connecting section 510 in the first direction. By setting the protrusion height and the ratio of b to a within a reasonable range, it can prevent b / a from being too large, which would result in an excessive distance in the first direction between the tab connection section 520 and the insulating part 300 of the cover plate assembly 1, leaving a large amount of wasted space. On the other hand, it can prevent b / a from being too small, which would result in the tab connection section 520 and the insulating part 300 of the cover plate assembly 1 being too close, or even causing interference between them, leading to poor structural reliability of the single cell.

[0077] Therefore, by setting the ratio b / a of the maximum protrusion height b of the tab connection section 520 relative to the pole connection section 510 in the first direction and the maximum distance a between the pole connection section 510 and the cover plate assembly 1 in the first direction to be greater than 0.4 and less than 1, it is possible not only to ensure that the space in the single cell is fully utilized by the electrode assembly and to increase the cell capacity of the electrode assembly, but also to prevent interference between the adapter piece 500 and the insulating part 300 of the cover plate assembly 1, thereby improving the structural reliability of the single cell.

[0078] In some specific embodiments of this utility model, such as Figures 7-11 As shown, the tab connection section 520 includes at least one step portion 521, wherein the step portion 521 may be in the shape of a planar step, that is, the plane on which the step portion 521 is located may be perpendicular to the first direction; or, the step portion 521 may also be in the shape of an inclined step, that is, the plane on which the step portion 521 is located may be inclined relative to the first direction.

[0079] Specifically, the step portion 521 located at the end of the tab connection section along the width direction of the cover plate 100 has its orthographic projection along the first direction falling on the cover plate body 150. That is, in the plane formed by the second and third directions, the outermost step portion 521 located in the width direction of the cover plate 100 will not extend beyond the cover plate body 150. This facilitates the welding and fixing of the step portion 521 located at the end of the tab connection section along the width direction of the cover plate 100 to the cover plate body 150, and the tab connection section 520 will not excessively occupy the internal space of the single battery casing, thereby avoiding space waste.

[0080] In some specific embodiments of this utility model, such as Figure 9 As shown, the tab connection section 520 includes two stepped portions 521 that are sequentially connected to the pole post connection section 510, or, as... Figure 10 As shown, a stepped portion 521 is connected to the pole connecting section 510 via a bent transition portion 524.

[0081] For example, two adjacent step portions 521 may include a first step portion 522 and a second step portion 523. The first step portion 522 may be connected between the second step portion 523 and the pole post connecting section 510, and along the first direction, the second step portion 523 may protrude relative to the first step portion 522 towards the cover plate 100. Alternatively, the pole tab connecting section 520 may include a bent transition portion 524 and a step portion 521. The bent transition portion 524 is connected between the step portion 521 and the pole post connecting section 510, and the bent transition portion 524 may extend obliquely relative to the first direction.

[0082] It is understood that this invention does not directly increase the height difference between the terminal connection section 510 and the tab connection section 520 in the first direction. Instead, it sets the tab connection section 520 as multiple steps 521 connected in the third direction, or connected steps 521 and bending transition sections 524. Furthermore, it arranges one of two adjacent steps 521 that is further away from the terminal connection section 510 to protrude towards the cover plate 100 relative to the other. With this arrangement, provided that b / a satisfies 0.4 ≤ b / a < 1, it can prevent a large height difference between the steps 521 adjacent to the terminal connection section 510 and the terminal connection section 510 in the first direction. This avoids interference between the steps 521 adjacent to the terminal connection section 510 and the mating portion 321 of the second insulating member 320, thereby further improving the structural reliability of the battery. Furthermore, with this configuration, when the tabs and at least a portion of the step portion 521 are in contact and electrically connected, the height difference between two adjacent step portions 521 in the first direction will not be too large, and the edges of the multi-layer tabs will not abut against the bend between two adjacent step portions 521. That is, the edges of the multi-layer tabs will not stack at the bend between two adjacent step portions 521, so as to facilitate the folding of the battery core.

[0083] The other configurations and operations of the cover plate assembly 1 and the individual battery according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0084] In the description of this specification, references to terms such as "specific embodiment" and "specific example" refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example that is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0085] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate includes a cover plate body and a first reinforcing structure. The first reinforcing structure includes a first protrusion and a first recess disposed on opposite sides of the cover plate along a first direction. The first protrusion protrudes from one side surface of the cover plate body along the first direction, and the first reinforcing structure is provided with a pole hole. The first direction is the thickness direction of the cover plate. The first protrusion and the first recess are disposed opposite to each other, and the extension dimension L2 of the first protrusion along the second direction is not less than the extension dimension L1 of the first recess along the second direction, where the second direction is the length direction of the cover plate.

2. The cover plate assembly according to claim 1, characterized in that, The first recess is constructed as a groove, and the volume of the space formed by the bottom wall and the side wall of the groove is V1. The volume of the first protrusion protruding from the cover plate body along the first direction is V2, and V1≥V2.

3. The cover plate assembly according to claim 2, characterized in that, The recessed portion has a recessed dimension of T1 in the first direction, the protrusion of the first protrusion from the cover plate body in the first direction has a protrusion dimension of T2, and the thickness of the cover plate body in the first direction is T3. Where 0.2≤T1 / T3≤0.5, 0.15≤T2 / T3≤0.

45.

4. The cover plate assembly according to claim 1, characterized in that, The cover plate further includes a second reinforcing structure, the second reinforcing structure including a second protrusion and a second recess disposed on opposite sides of the cover plate along the first direction, the second reinforcing structure and the first reinforcing structure being arranged at intervals along the second direction; The first protrusion and the second protrusion are located on the same side of the cover plate, and the first recess and the second recess are located on the same side of the cover plate.

5. The cover plate assembly according to claim 4, characterized in that, The cover plate is also provided with an injection hole and an explosion-proof hole. There are two first reinforcing structures, and the pole holes on the first reinforcing structure are respectively the first pole hole and the second pole hole. The first pole hole, the injection hole, the explosion-proof hole and the second pole hole are arranged at intervals along the second direction. Wherein, the first electrode post hole is provided with at least one of the second reinforcing structures on the side facing away from the injection hole in the second direction; and / or, At least one of the second reinforcing structures is provided between the injection hole and the explosion-proof hole; and / or, At least one of the second reinforcing structures is provided between the explosion-proof hole and the second pole post hole; and / or, The second pole post hole has at least one second reinforcing structure on the side facing away from the explosion-proof hole in the second direction.

6. The cover plate assembly according to claim 1, characterized in that, Also includes: The electrode post is inserted through the electrode post hole and along the first direction, with its two ends located on both sides of the cover plate. At least a portion of the first reinforcing structure is located between the two ends of the electrode post, and the electrode post and the cover plate are connected by an insulating and sealing structure.

7. The cover plate assembly according to claim 6, characterized in that, The insulating sealing structure includes an insulating element disposed between the cover plate and the pole post. The insulating element includes an insulating element body and a mating part. The insulating element body is adapted to the cover plate body, and the mating part is adapted to at least the first reinforcing structure. Wherein, along the first direction, the gap between the first reinforcing structure and the upper surface of the mating part is B1, and B1 > 0.1 mm; and / or, Along the radial direction of the pole hole, the gap between the first reinforcing structure and the sidewall of the mating part is B2, and B2 > 0.3 mm.

8. A single-cell battery, comprising a cover assembly as described in any one of claims 1-7, characterized in that, Also includes: Electrode assembly, including tabs; An adapter piece, disposed on the side of the cover plate assembly facing the electrode assembly, and comprising: A pole connection section is connected to the pole. A tab connecting section is connected to the tab, the tab connecting section is connected to both sides of the pole post connecting section, and the tab connecting section protrudes towards the cover plate assembly in the first direction relative to the pole post connecting section. Wherein, the maximum distance between the pole connecting section and the cover plate in the first direction is a, and the maximum protrusion height of the pole connecting section relative to the pole connecting section in the first direction is b, and a and b satisfy the relationship: 0.4≤b / a<1.

9. The single-cell battery according to claim 8, characterized in that, The tab connection section includes at least one stepped portion, wherein the orthographic projection of the stepped portion located at the end of the tab connection section along the width direction of the cover plate along the first direction falls on the cover plate body.

10. The single-cell battery according to claim 8 or 9, characterized in that, The tab connection section includes two stepped portions that are sequentially connected to the pole connection section, or one stepped portion that is connected to the pole connection section through a bent transition portion.

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