Cover plate forming method, cover plate, cover plate assembly, battery, and battery pack

Abstract

This invention relates to the field of battery technology, disclosing a cover plate forming method, a cover plate, a cover plate assembly, a battery, and a battery pack, including the following steps: S1: forming an initial hole on a metal sheet; S2: forming a protruding edge; S3: forming a cantilever structure and a flange structure on the protruding edge; in step S1, the metal sheet is either a convex plate structure or a flat plate structure; when the metal sheet is a convex plate structure, before step S1, there is step S0: stamping a boss and forming a recess on a flat substrate; when the metal sheet is a flat plate structure, after step S3, there is step S4: stamping a portion around the outer periphery of the flange structure to form a protrusion and forming a groove. This invention, by stamping a boss on a flat substrate or stamping a protrusion around the outer periphery of the flange structure, provides a larger thickness at the root of the cantilever structure, improving structural strength, reducing the risk of fracture at the root of the cantilever structure, and ensuring the reliability of the electrode post structure installation.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a cover plate forming method, a cover plate, a cover plate assembly, a battery, and a battery pack. Background Technology

[0002] The terminal is a component in a battery used to achieve current input and output. The cover plate typically has a cantilever beam to support the terminal, and the upper surface of the terminal is then riveted together using a flanged structure on the cover plate to secure it. However, in existing technology, the structural strength at the root of the cantilever beam is relatively low, making it prone to breakage and affecting the stability of the terminal installation. Summary of the Invention

[0003] This invention provides a cover plate forming method, a cover plate, a cover plate assembly, a battery, and a battery pack, to solve the problem in the prior art that the structural strength at the root position of the cantilever beam is low, making it prone to breakage and affecting the stability of the pole installation.

[0004] In a first aspect, the present invention provides a method for forming a cover plate, comprising the steps of: S1: Initial holes are formed on the metal sheet; S2: The metal sheet along the periphery of the initial hole is processed to form a protruding edge that protrudes from the first side to the second side in a third direction; S3: For the part of the convex edge near the inner circumference, a cantilever structure is formed by processing from the second side in the third direction to the first side, and the remaining part of the convex edge forms a flange structure. In step S1, the metal sheet is either a convex plate structure or a flat plate structure. When the metal sheet is a convex structure, before step S1, there is step S0: a boss is formed on the flat substrate from the second side in the third direction to the first side, and a recess is formed on the side of the flat substrate facing the second side. On the projection plane perpendicular to the third direction, the orthographic projection of the side of the boss facing the first side is located within the orthographic projection range of the recess. In step S1, the initial hole is opened on the boss. When the metal sheet is a flat structure, after step S3, step S4 is performed: a protrusion is formed by punching the portion of the metal sheet surrounding the outer periphery of the flange structure from the second side in the third direction to the first side, and a groove is formed on the side of the metal sheet facing the second side. On the projection plane perpendicular to the third direction, the outer periphery edge of the orthographic projection of the side of the protrusion facing the first side is located within the orthographic projection range of the groove.

[0005] Beneficial effects: During the cover plate forming process, by stamping a boss into a flat substrate or stamping a protrusion into the outer periphery of the flange structure, the root position of the cantilever structure has a larger thickness, which improves the structural strength, reduces the risk of fracture at the root position of the cantilever structure, and ensures the reliability of the pole structure installation.

[0006] Secondly, the present invention also provides a cover plate, formed using the above-described cover plate forming method, comprising: The plate body has a first surface and a second surface that are arranged opposite to each other along a third direction, and the plate body has a through-hole in the third direction; A flange structure is provided, which is connected to the second surface and protrudes from the second surface in a third direction, and the flange structure is provided around the pole hole; A cantilever structure is connected to the plate body. The cantilever structure extends out of the hole wall of the pole hole in a plane perpendicular to the third direction. Along the third direction, the cantilever structure is closer to the first side than the first surface. Wherein, a groove is recessed on the second surface surrounding the flange structure in the direction toward the first surface, and a protrusion is formed on the first surface. The protrusion is connected to the cantilever structure. On a projection plane perpendicular to the third direction, the outer peripheral edge of the orthographic projection of the side of the protrusion toward the first side is located within the orthographic projection range of the groove.

[0007] Thirdly, the present invention also provides a cover plate assembly, comprising: The aforementioned cover plate; A pole structure is disposed on the cantilever structure, and the flange structure is folded and pressed onto the side of the pole structure away from the cantilever structure.

[0008] Fourthly, the present invention also provides a battery, comprising: The housing has an opening at least at one end; The aforementioned cover assembly is connected to the housing and seals the opening, and the housing and the cover assembly together form an accommodating space; A battery cell is disposed within the receiving space, and the battery cell is electrically connected to the electrode structure.

[0009] Fifthly, the present invention also provides a battery pack comprising a plurality of the aforementioned batteries. Attached Figure Description

[0010] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 This is a schematic cross-sectional view of the flat substrate along a third direction according to an embodiment of the present invention; Figure 2 This is a schematic diagram of step S0 of the cover plate forming method when the metal sheet is a convex plate structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of step S1 of the cover plate forming method when the metal sheet is a convex plate structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of step S21 of the cover plate forming method when the metal sheet is a convex plate structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of step S22 of the cover plate forming method when the metal sheet is a convex plate structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of step S23 of the cover plate forming method when the metal sheet is a convex plate structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of step S3 of the cover plate forming method when the metal sheet is a convex plate structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of step S1 of the cover plate forming method when the metal sheet is a flat plate structure according to an embodiment of the present invention; Figure 9 This is a schematic diagram of step S21 of the cover plate forming method when the metal sheet is a flat plate structure according to an embodiment of the present invention; Figure 10 This is a schematic diagram of step S22 of the cover plate forming method when the metal sheet is a flat plate structure according to an embodiment of the present invention; Figure 11 This is a schematic diagram of step S23 of the cover plate forming method when the metal sheet is a flat plate structure according to an embodiment of the present invention; Figure 12 This is a schematic diagram of step S3 of the cover plate forming method when the metal sheet is a flat plate structure according to an embodiment of the present invention; Figure 13 This is a schematic diagram of step S4 of the cover plate forming method when the metal sheet is a flat plate structure according to an embodiment of the present invention; Figure 14 This is a schematic diagram of the battery structure according to an embodiment of the present invention; Figure 15 for Figure 14 A top view of the battery shown; Figure 16 for Figure 15 A cross-sectional view along the AA direction; Figure 17 for Figure 16 Enlarged view of point B in the middle.

[0012] Explanation of reference numerals in the attached figures: 1. Metal sheet; 101. Initial hole; 102. Raised edge; 103. Cantilever structure; 104. Flanged structure; 1041. Connecting section; 1042. Riveting section; 105. Beveled edge; 106. Straight edge; 107. Through hole; 2. Flat base material; 201. Boss; 202. Concave; 10. Cover plate; 110. Plate body; 111. First surface; 112. Second surface; 113. Pole post hole; 114. Groove; 115. Groove bottom wall; 120. Protrusion; 20. Pole post structure; 210. Pole post body; 220. Upper insulating component; 30. Lower insulating component; 100. Cover plate assembly; 200. Housing; 300. Battery cell; 310. Electrode tab; 400. Adapter plate; 1000, battery. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Researchers have found that in related technologies, after the flange structure 104 and the cantilever structure 103 are formed, the lower surface of the cantilever structure 103 is flush with the lower surface of the main body 110, resulting in a smaller thickness and lower structural strength at the root of the cantilever structure 103. This increases the risk of breakage at the root of the cantilever structure 103, thus posing a safety risk to the battery 1000.

[0015] The following is combined with Figures 1 to 17 The following describes embodiments of the present invention.

[0016] According to an embodiment of the present invention, in a first aspect, a cover plate forming method is provided, comprising the steps of: S1: Initial hole 101 is formed on metal plate 1; S2: The metal plate 1 along the periphery of the initial hole 101 is processed to form a protruding edge 102 that protrudes from the first side to the second side in a third direction; S3: The portion of the convex edge 102 near the inner periphery is processed from the second side in the third direction to the first side to form a cantilever structure 103, and the remaining portion of the convex edge 102 forms a flange structure 104. In step S1, the metal plate 1 is either a convex plate structure or a flat plate structure. When the metal sheet 1 has a convex structure, before step S1, there is step S0: a boss 201 is formed on the flat substrate 2 from the second side in a third direction to the first side, and a recess 202 is formed on the side of the flat substrate 2 facing the second side. On the projection plane perpendicular to the third direction, the orthographic projection of the side of the boss 201 facing the first side is located within the orthographic projection range of the recess 202. In step S1, the initial hole 101 is opened on the boss 201. When the metal sheet 1 is a flat structure, after step S3, step S4 is performed: a protrusion 120 is formed by punching the portion of the metal sheet 1 surrounding the outer periphery of the flange structure 104 from the second side in a third direction to the first side, and a groove 114 is formed on the side of the metal sheet 1 facing the second side. On the projection plane perpendicular to the third direction, the outer periphery edge of the orthographic projection of the side of the protrusion 120 facing the first side is located within the orthographic projection range of the groove 114.

[0017] By applying the cover plate forming method of this embodiment, during the forming process of the cover plate 10, a boss 201 is formed by stamping the flat substrate 2 or a protrusion 120 is formed by stamping the outer periphery of the flange structure 104, so that the root position of the cantilever structure 103 has a larger thickness, thereby improving the structural strength, reducing the risk of fracture at the root position of the cantilever structure 103, and ensuring the reliability of the pole structure 20 installation.

[0018] It is worth noting that, such as Figure 2 As shown, when a boss 201 and a recess 202 are formed by stamping on the flat substrate 2, the recessed area of ​​the recess 202 is made larger than the protruding area of ​​the boss 201, such as... Figure 13 As shown, when the protrusion 120 and the groove 114 are stamped on the outer periphery of the flange structure 104, the recessed range of the groove 114 is made larger than the protruding range of the protrusion 120. Therefore, the material of the recess can be used to supplement the thickness at the root position of the cantilever structure 103, improve the structural strength at the root position of the cantilever structure 103, and reduce the risk of fracture.

[0019] It should be noted that, as Figures 2 to 7 As shown, when the metal plate 1 is a convex plate structure in step S1, and the flat substrate 2 is processed and formed in steps S0 to S3, in the cover plate 10 after the forming is completed, a groove 114 is formed on the second surface 112 of the plate body 110 around the flange structure 104 in the direction toward the first surface 111, and a protrusion 120 is formed on the first surface 111. The protrusion 120 is connected to the cantilever structure 103. On the projection plane perpendicular to the third direction, the outer peripheral edge of the orthographic projection of the side of the protrusion 120 toward the first side is located within the orthographic projection range of the groove 114.

[0020] like Figures 8 to 13As shown, when the metal sheet 1 is a flat structure in step S1, the metal sheet 1 is processed and formed through steps S1 to S4. When the processing is completed in step S3, the side of the cantilever structure 103 facing the first side is flush with the first surface 111 of the plate body 110. Then, the protrusion 120 is formed by stamping in step S4. During the stamping process, the flange structure 104 and the cantilever structure 103 move synchronously towards the first side, so that the side of the cantilever structure 103 facing the first side, together with the protrusion 120, extends beyond the first surface 111 of the plate body 110.

[0021] In one embodiment, such as Figure 1 and Figure 2 As shown, when the metal plate 1 is a convex plate structure, the thickness of the flat substrate 2 along the third direction is a mm. In step S0, the depth of the recess 202 along the third direction is b mm, satisfying 0.05≤b / a≤0.6. This setting can effectively improve the structural strength of the cantilever structure 103 root while avoiding affecting the structural strength of the cover plate 10 at the groove 114.

[0022] It is worth noting that if the value of b / a is too large, the cover plate 10 will be too thin at the position opposite the first surface 111 in the groove 114, which may easily lead to breakage and affect the structural strength of the cover plate 10. If the value of b / a is too small, there will be too little material used to form the protrusion 120, which will not be enough to improve the structural strength of the root position of the cantilever structure 103, and the root position of the cantilever structure 103 will still have a large risk of breakage.

[0023] Optionally, b / a can be any value from 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, or a value between any two values.

[0024] Specifically, the thickness a mm of the flat substrate 2 satisfies 1.5≤a≤3.5.

[0025] Optionally, the value of 'a' can be any one of 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, or a value between any two of them.

[0026] Specifically, the depth b mm of the recess 202 satisfies 0.2≤b≤2.

[0027] Optionally, b can take any value from 0.2, 0.3, 0.5, 0.7, 0.8, 1, 1.2, 1.3, 1.5, 1.7, 1.8, 2, or a value between any two values.

[0028] In one embodiment, such as Figure 8 and Figure 13 As shown, when the metal plate 1 is a flat plate structure, the thickness of the flat plate 1 is c mm along the third direction. In step S4, the depth of the groove 114 along the third direction is d mm, satisfying 0.05≤d / c≤0.6. This setting can effectively improve the structural strength of the root of the cantilever structure 103 while avoiding affecting the structural strength of the cover plate 10 at the groove 114.

[0029] It is worth noting that if the value of d / c is too large, the cover plate 10 will be too thin at the position opposite the first surface 111 in the groove 114, which may easily lead to breakage and affect the structural strength of the cover plate 10. If the value of d / c is too small, there will be too little material used to form the protrusion 120, which will not be enough to improve the structural strength of the root position of the cantilever structure 103, and the root position of the cantilever structure 103 will still have a large risk of breakage.

[0030] Optionally, d / c can be any value from 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, or a value between any two values.

[0031] Specifically, the thickness c mm of the flat metal plate 1 satisfies 1.5≤c≤3.5.

[0032] Optionally, c can take any value from 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, or a value between any two values.

[0033] Specifically, the depth d mm of the groove 114 satisfies 0.2≤d≤2.

[0034] Optionally, d can take any value from 0.2, 0.3, 0.5, 0.7, 0.8, 1, 1.2, 1.3, 1.5, 1.7, 1.8, 2, or a value between any two values.

[0035] In one embodiment, such as Figure 2 As shown, when the metal plate 1 is a convex plate structure, in step S0, on the projection plane perpendicular to the third direction, the distance between the outer peripheral edge of the orthographic projection of the side of the boss 201 facing the first side and the outer peripheral edge of the orthographic projection of the recess 202 is e mm, satisfying 0.05≤e≤5. This setting can effectively improve the structural strength of the root of the cantilever structure 103 while avoiding affecting the structural strength of the cover plate 10 at the groove 114.

[0036] It is worth noting that if the value of e is too large, the opening range of the recess 202 will be too large, which will weaken the structural strength of the cover plate 10 too much and affect the structural strength of the cover plate 10. If the value of e is too small, there will be too little material used to form the protrusion 120, which will not be enough to improve the structural strength of the root position of the cantilever structure 103, and the root position of the cantilever structure 103 will still have a large risk of fracture.

[0037] Optionally, the value of e can be any one of 0.05, 0.5, 1, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.5, 5 or a value between any two values.

[0038] In one embodiment, such as Figure 13 As shown, when the metal plate 1 is a flat structure, in step S4, on the projection plane perpendicular to the third direction, the distance between the outer peripheral edge of the orthographic projection of the protrusion 120 facing the first side and the outer peripheral edge of the orthographic projection of the groove 114 is f mm, satisfying 0.05≤f≤5. This configuration effectively improves the structural strength of the cantilever structure 103 root while avoiding impacting the structural strength of the cover plate 10 at the groove 114.

[0039] It is worth noting that if the value of f is too large, the opening range of the groove 114 will be too large, which will weaken the structural strength of the cover plate 10 too much and affect the structural strength of the cover plate 10. If the value of f is too small, there will be too little material used to form the protrusion 120, which will not be enough to improve the structural strength of the root position of the cantilever structure 103, and the root position of the cantilever structure 103 will still have a large risk of fracture.

[0040] Optionally, f can take any value from 0.05, 0.5, 1, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.5, 5, or a value between any two values.

[0041] In one embodiment, such as Figure 3 As shown, when the metal plate 1 is a convex plate structure, in step S1, in the direction perpendicular to the third direction, the width of the remaining portion of the side of the boss 201 facing the first side after forming the initial hole 101 is g mm; in the direction perpendicular to the third direction, the width of the metal plate 1 along the periphery of the initial hole 101 for forming the convex edge 102 in step S2 is h mm, satisfying 1≤gh≤23. This configuration ensures the structural strength of both the flange structure 104 and the cantilever structure 103, while also ensuring the structural strength of the root position of the cantilever structure 103.

[0042] It is worth noting that if the value of gh is too large, there will be too little material used to process the protruding edge 102 of the flange structure 104 and the cantilever structure 103, which may result in the flange structure 104 and the cantilever structure 103 being too thin, leading to insufficient structural strength. If the value of gh is too small, the cantilever structure 103 and the flange structure 104 may be too close to the edge of the boss 201, resulting in insufficient improvement in the structural strength of the root position of the cantilever structure 103, and the root position of the cantilever structure 103 still has a significant risk of fracture.

[0043] Optionally, gh can be any value from 1, 3, 5, 7, 9, 10, 12, 14, 15, 18, 20, 21, 23 or a value between any two values.

[0044] Specifically, after machining the initial hole 101, the width g mm of the remaining portion of the boss 201 facing the first side satisfies 3.5≤g≤25.

[0045] Optionally, g can take any value from 3.5, 5, 7, 9, 10, 12, 14, 15, 18, 20, 21, 23, 25 or a value between any two values.

[0046] Specifically, the width h mm of the metal plate 1 along the periphery of the initial hole 101 used to form the protruding edge 102 in step S2 satisfies 2≤h≤5.

[0047] Optionally, h can take any value from 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.5, 5, or a value between any two values.

[0048] In one embodiment, when the metal sheet is a convex plate structure, in step S0, on the projection plane perpendicular to the third direction, the maximum opening diameter of the outer peripheral edge of the concave portion in the projection direction perpendicular to the third direction is j mm, satisfying 30≤j≤70.

[0049] It is worth noting that if the value of j is too large, the opening range of the recess 202 will be too large, which will weaken the structural strength of the cover plate 10 too much and affect the structural strength of the cover plate 10. If the value of j is too small, there will be too little material used to form the protrusion 120, which will not be enough to improve the structural strength of the root position of the cantilever structure 103, and the root position of the cantilever structure 103 will still have a large risk of fracture.

[0050] Optionally, j can take any value from 30, 32, 35, 38, 40, 45, 50, 55, 60, 62, 65, 68, 70, or a value between any two values.

[0051] In one embodiment, when the metal sheet is a flat plate structure, in step S4, on the projection plane perpendicular to the third direction, the maximum opening diameter of the outer peripheral edge of the groove in the projection perpendicular to the third direction is k mm, satisfying 30≤k≤60.

[0052] It is worth noting that if the value of k is too large, the opening range of the groove 114 will be too large, which will weaken the structural strength of the cover plate 10 too much and affect the structural strength of the cover plate 10. If the value of k is too small, there will be too little material used to form the protrusion 120, which will not be enough to improve the structural strength of the root position of the cantilever structure 103, and there will still be a large risk of fracture at the root position of the cantilever structure 103.

[0053] Optionally, k can take any value from 30, 32, 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60, or a value between any two values.

[0054] It should be noted that when the metal sheet is a convex plate structure and the initial hole is formed on the convex plate, compared with the case when the metal sheet is a flat plate structure and the initial hole is formed on the metal sheet, the amount of material removed during the initial hole processing is relatively larger. Therefore, in step S0, the maximum opening diameter j mm of the outer periphery of the concave portion in the projection plane perpendicular to the third direction can be slightly larger to ensure that the root position of the cantilever structure has sufficient thickness and to ensure structural strength.

[0055] Specifically, in one embodiment, such as Figure 4 , Figure 5 , Figure 9 and Figure 10 As shown, step S2 includes the following steps: S21: The metal plate 1 along the periphery of the initial hole 101 is punched from the first side to the second side in the third direction to form a bevel 105, and the bevel 105 is set at a predetermined angle with the third direction. S22: Shape the hypotenuse 105 so that it becomes a straight side 106 extending along the third direction.

[0056] It is worth noting that the metal sheet 1 is first stamped to form a bevel 105, and then the bevel 105 is shaped to form a straight edge 106. This avoids excessive stress and deformation when the metal sheet 1 is processed into a straight edge 106 in one go, which could cause cracks at the bend of the straight edge 106 and ensure the structural strength of the cover plate 10.

[0057] It is understood that in this embodiment, "the first side to the second side in the third direction" refers to the vertical direction from bottom to top, and correspondingly, "the second side to the first side in the third direction" refers to the vertical direction from top to bottom.

[0058] Furthermore, in one embodiment, such as Figure 6 and Figure 11 As shown, step S2 further includes the following step: S23: Stretch the straight edge 106 along the third direction to a predetermined height to form a convex edge 102.

[0059] It is worth noting that the protruding edge 102 is formed by punching out the metal sheet 1 along the periphery of the initial hole 101 in a horizontal plane. If the punching range of the metal sheet 1 is expanded during punching to ensure the height of the protruding edge 102, it will lead to increased processing difficulty and poor processing quality. Therefore, in this embodiment, the punched metal sheet 1 does not need to have an excessively large range. First, a straight edge 106 with a certain height is formed, and then the straight edge 106 is stretched to form the protruding edge 102 that reaches the predetermined height. This can ensure processing accuracy and quality while reducing processing difficulty.

[0060] Furthermore, in one embodiment, such as Figure 7 and Figure 12 As shown, step S3 includes the following steps: S31: For the portion of the convex edge 102 near the inner circumference, the initial cantilever is formed by pressing from the second side in a third direction toward the first side; S32: Flatten the initial cantilever to form a cantilever structure with uniform thickness 103.

[0061] It is worth noting that when the material of the protruding edge 102 is extruded to form the initial cantilever, the uneven material flow can easily cause material accumulation in some places and material shortage in some places, resulting in uneven thickness of the initial cantilever. Therefore, by further flattening the initial cantilever, the final cantilever structure 103 has a uniform thickness.

[0062] Furthermore, in one embodiment, in step S32, after flattening the initial cantilever, a through hole 107 is punched in the middle of the flattened cantilever, and the remaining part forms the cantilever structure 103.

[0063] Specifically, in one embodiment, the through hole 107 is a circular hole or a racetrack-shaped hole. That is, the forming method of the cover plate 10 in this embodiment can use either a circular pole or a racetrack-shaped pole.

[0064] It is worth noting that after the initial cantilever is flattened, there may be excess material, which may cause the central hole to be not a standard circular hole or a racetrack-shaped hole. Therefore, the excess material is punched away in the middle of the flattened cantilever to form a standard circular hole or a racetrack-shaped hole for subsequent assembly of the pole post structure 20.

[0065] According to an embodiment of the present invention, a second aspect, such as Figure 7 As shown, a cover plate 10 is also provided, which is formed using the cover plate forming method described above, including: The plate body 110 has a first surface 111 and a second surface 112 arranged opposite to each other along a third direction, and the plate body 110 has a pole hole 113 through it along a third direction; The flange structure 104 is connected to the second surface 112 and protrudes from the second surface 112 in a third direction. The flange structure 104 is arranged around the pole hole 113. The cantilever structure 103 is connected to the plate body 110. The cantilever structure 103 extends the hole wall of the pole hole 113 on a plane perpendicular to the third direction. Along the third direction, the cantilever structure 103 is closer to the first side than the first surface 111. The second surface 112 has a recessed groove 114 formed around the flange structure 104 in the direction toward the first surface 111, and a protrusion 120 is formed on the first surface 111. The protrusion 120 is connected to the cantilever structure 103. On the projection plane perpendicular to the third direction, the outer peripheral edge of the orthographic projection of the side of the protrusion 120 toward the first side is located within the orthographic projection range of the groove 114.

[0066] It is worth noting that the first surface 111 is the side of the main body 110 facing the first side, and the second surface 112 is the side of the main body 110 facing the second side.

[0067] Furthermore, in one embodiment, such as Figure 7 As shown, along the third direction, the plate body 110 forms a groove bottom wall 115 at the end of the groove 114 near the first surface 111; along the third direction, the distance between the groove bottom wall 115 and the first surface 111 is imm, satisfying 0.8≤i≤3.2. This arrangement can effectively improve the structural strength of the root of the cantilever structure 103 while avoiding affecting the structural strength of the cover plate 10 at the groove 114.

[0068] It is worth noting that if the value of i is too small, the cover plate 10 will be too thin at the position opposite to the first surface 111 at the groove 114, which may easily lead to breakage and affect the structural strength of the cover plate 10. If the value of i is too large, there will be too little material used to form the protrusion 120, which will not be enough to improve the structural strength of the root position of the cantilever structure 103, and the root position of the cantilever structure 103 will still have a large risk of breakage.

[0069] Optionally, the value of i can be any one of 0.8, 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2 or a value between any two values.

[0070] Furthermore, in one embodiment, such as Figure 7 As shown, on the projection plane perpendicular to the third direction, the width of the groove's orthographic projection perpendicular to the third direction is L mm, satisfying 2≤L≤15.

[0071] It is worth noting that if the value of L is too large, the opening range of the groove 114 will be too large, which will weaken the structural strength of the cover plate 10 too much and affect the structural strength of the cover plate 10. If the value of L is too small, there will be too little material used to form the protrusion 120, which will not be enough to improve the structural strength of the root position of the cantilever structure 103, and there will still be a large risk of fracture at the root position of the cantilever structure 103.

[0072] Optionally, L can be any value from 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 9, 10, 11, 12, 13, 14 or 15, or a value between any two values.

[0073] According to an embodiment of the present invention, a third aspect, such as Figure 14 As shown, a cover plate assembly 100 is also provided, comprising: The aforementioned cover plate 10; The pole post structure 20 is disposed on the cantilever structure 103, and the flange structure 104 is folded and pressed onto the side of the pole post structure 20 away from the cantilever structure 103.

[0074] It should be noted that, as Figure 17 As shown, the flange structure 104 includes a connecting section 1041 and a riveting section 1042. The connecting section 1041 is connected between the plate body 110 and the riveting section 1042. The riveting section 1042 is pressed onto the pole structure 20. The riveting section 1042 and the connecting section 1041 are set at a certain angle.

[0075] It is worth noting that for the racetrack-shaped pole, the orthographic projection of the flange structure 104 formed on the cover plate 10 onto the projection plane perpendicular to the third direction is also racetrack-shaped; for the circular pole, the orthographic projection of the flange structure 104 formed on the cover plate 10 onto the projection plane perpendicular to the third direction is also circular.

[0076] Specifically, for the circular pole (the flange structure 104 with a circular projection), the flange structure 104 is folded by rolling the edge.

[0077] Specifically, for the racetrack-shaped pole (the flanged structure 104 projected in the shape of a racetrack), the flanged structure 104 is folded by rolling the arc edge and riveting the straight edge 106. It should be further noted that in one embodiment, the flanged structure 104 only has an arc edge, so it can be folded by rolling only.

[0078] Furthermore, in one embodiment, such as Figure 17 As shown, the pole structure 20 includes a pole body 210 and an upper insulating member 220. The upper insulating member 220 is arranged around the outer periphery of the pole body 210, and at least part of the upper insulating member 220 is located between the flange structure 104 and the pole body 210.

[0079] Furthermore, in one embodiment, such as Figure 17 As shown, the battery 1000 also includes a lower insulating member 30, which is disposed on the side of the second surface 112, the protrusion 120, and the cantilever structure 103 facing the cell 300 body. With this arrangement, the lower insulating member 30 can form a barrier between the terminal body 210 and the first end of the tab 310, preventing the tab 310 from being inserted between the terminal body 210 and the adapter piece 400 and affecting the welding of the terminal body 210 and the adapter piece 400.

[0080] According to an embodiment of the present invention, a fourth aspect, such as Figures 14 to 17 As shown, a battery 1000 is also provided, comprising: The housing 200 has an opening at least at one end; The cover plate assembly 100 described above is connected to the housing 200 and seals the opening. The housing 200 and the cover plate assembly 100 together form an accommodating space. The battery cell 300 is disposed within the housing space and is electrically connected to the electrode structure 20.

[0081] It is worth noting that the battery cell 300 includes a tab 310, which can be directly connected to the terminal structure 20, or the tab 310 is connected to an adapter piece 400, which is connected to the terminal structure 20.

[0082] According to an embodiment of the present invention, in a fifth aspect, the present invention also provides a battery pack comprising a plurality of the aforementioned batteries 1000.

[0083] Furthermore, in one embodiment, the battery pack also includes a busbar that connects the terminal structures 20 of two batteries 1000 to enable the series or parallel connection of several batteries 1000.

[0084] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for forming a cover plate, characterized in that, Including the following steps: S1: An initial hole (101) is formed on a metal sheet (1). S2: The metal plate (1) along the periphery of the initial hole (101) is processed to form a protruding edge (102) that protrudes from the first side to the second side in the third direction. S3: The portion of the convex edge (102) near the inner periphery is processed from the second side in the third direction to the first side to form a cantilever structure (103), and the remaining portion of the convex edge (102) forms a flange structure (104). In step S1, the metal plate (1) is a convex plate structure or a flat plate structure; When the metal sheet (1) is a convex plate structure, before step S1, there is step S0: a boss (201) is formed on the flat substrate (2) from the second side in a third direction to the first side, and a recess (202) is formed on the side of the flat substrate (2) facing the second side. On the projection plane perpendicular to the third direction, the orthographic projection of the side of the boss (201) facing the first side is located within the orthographic projection range of the recess (202); and in step S1, an initial hole (101) is opened on the boss (201). When the metal sheet (1) is a flat structure, after step S3, step S4 is performed: a protrusion (120) is formed by stamping the portion of the metal sheet (1) surrounding the outer periphery of the flange structure (104) from the second side in the third direction to the first side, and a groove (114) is formed on the side of the metal sheet (1) facing the second side. On the projection plane perpendicular to the third direction, the outer periphery edge of the orthographic projection of the side of the protrusion (120) facing the first side is located within the orthographic projection range of the groove (114).

2. The cover plate forming method according to claim 1, characterized in that, When the metal sheet (1) is a convex plate structure, the thickness of the flat substrate (2) along the third direction is a mm, and in step S0, the depth of the recess (202) along the third direction is b mm, satisfying 0.05≤b / a≤0.6; When the metal plate (1) is a flat plate structure, the thickness of the flat plate (1) is c mm along the third direction. In step S4, the depth of the groove (114) is d mm along the third direction, satisfying 0.05≤d / c≤0.

6.

3. The cover plate forming method according to claim 1, characterized in that, When the metal plate (1) is a convex plate structure, in step S0, on the projection plane perpendicular to the third direction, the distance between the outer peripheral edge of the orthographic projection of the side of the boss (201) facing the first side and the outer peripheral edge of the orthographic projection of the concave part (202) is e mm, which satisfies 0.05≤e≤5. When the metal plate (1) is a flat plate structure, in step S4, on the projection surface perpendicular to the third direction, the distance between the outer peripheral edge of the orthographic projection of the protrusion (120) facing the first side and the outer peripheral edge of the orthographic projection of the groove (114) is fmm, which satisfies 0.05≤f≤5.

4. The cover plate forming method according to claim 1, characterized in that, When the metal plate (1) is a convex plate structure, in step S1, in the direction perpendicular to the third direction, the width of the remaining part of the side of the boss (201) facing the first side after forming the initial hole (101) is g mm; in the direction perpendicular to the third direction, the width of the metal plate (1) along the periphery of the initial hole (101) for forming the convex edge (102) in step S2 is h mm, satisfying 1≤gh≤23.

5. The cover plate forming method according to any one of claims 1 to 4, characterized in that, Step S2 includes the following steps: S21: The metal plate (1) along the periphery of the initial hole (101) is punched from the first side to the second side in the third direction to form a bevel (105), and the bevel (105) is set at a predetermined angle with the third direction; S22: Shape the hypotenuse (105) to form a straight edge (106) extending along the third direction.

6. The cover plate forming method according to claim 5, characterized in that, Step S2 also includes the following steps: S23: Stretch the straight edge (106) along the third direction to a predetermined height to form the convex edge (102).

7. The cover plate forming method according to any one of claims 1 to 4, characterized in that, Step S3 includes the following steps: S31: For the portion of the convex edge (102) near the inner circumference, the initial cantilever is formed by pressing the second side in the third direction towards the first side; S32: Flatten the initial cantilever to form a cantilever structure with uniform thickness (103).

8. The cover plate forming method according to claim 7, characterized in that, In step S32, after flattening the initial cantilever, a through hole (107) is punched in the middle of the flattened cantilever, and the remaining part forms the cantilever structure (103).

9. The cover plate forming method according to claim 8, characterized in that, The through hole (107) is a circular hole or a racetrack-shaped hole.

10. The cover plate forming method according to claim 1, characterized in that, When the metal plate (1) is a convex plate structure, in step S0, on the projection plane perpendicular to the third direction, the outer peripheral edge of the concave part (202) in the orthographic projection has a maximum opening diameter of j mm in the direction perpendicular to the third direction, satisfying 30≤j≤70.

11. The cover plate forming method according to claim 1, characterized in that, When the metal plate (1) is a flat plate structure, in step S4, on the projection surface perpendicular to the third direction, the outer peripheral edge of the orthographic projection of the groove (114) has a maximum opening diameter of k mm in the direction perpendicular to the third direction, satisfying 30≤k≤60.

12. A cover plate, formed by the cover plate forming method according to any one of claims 1 to 11, characterized in that, include: The plate body (110) has a first surface (111) and a second surface (112) arranged opposite to each other along a third direction, and the plate body (110) is provided with a pole hole (113) through along a third direction. A flange structure (104) is connected to the second surface (112) and protrudes from the second surface (112) in a third direction, the flange structure (104) being disposed around the pole hole (113); A cantilever structure (103) is connected to the plate body (110). The cantilever structure (103) extends out of the hole wall of the pole hole (113) on a plane perpendicular to the third direction. Along the third direction, the cantilever structure (103) is closer to the first side than the first surface (111). In this design, a groove (114) is recessed on the second surface (112) in the direction of the flange structure (104) toward the first surface (111), and a protrusion (120) is protruded on the first surface (111). The protrusion (120) is connected to the cantilever structure (103). On a projection plane perpendicular to the third direction, the outer peripheral edge of the orthographic projection of the side of the protrusion (120) toward the first side is located within the orthographic projection range of the groove (114).

13. The cover plate according to claim 12, characterized in that, Along the third direction, the plate body (110) forms a groove bottom wall (115) at one end of the groove (114) near the first surface (111); along the third direction, the distance between the groove bottom wall (115) and the first surface (111) is i mm, satisfying 0.8≤i≤3.

2.

14. The cover plate according to claim 12, characterized in that, On the projection plane perpendicular to the third direction, the width of the orthographic projection of the groove (114) in the direction perpendicular to the third direction is L mm, satisfying 2≤L≤15.

15. A cover plate assembly, characterized in that, include: Cover plate (10) according to any one of claims 12 to 14; The pole post structure (20) is disposed on the cantilever structure (103), and the flange structure (104) is folded and pressed onto the side of the pole post structure (20) away from the cantilever structure (103).

16. A battery, characterized in that, include: The housing (200) has an opening at at least one end; The cover plate assembly (100) of claim 15 is connected to the housing (200) and seals the opening, wherein the housing (200) and the cover plate assembly (100) enclose a receiving space; A battery cell (300) is disposed within the accommodating space, and the battery cell (300) is electrically connected to the electrode structure (20).

17. A battery pack, characterized in that, Includes several batteries (1000) as described in claim 16.

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