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

Abstract

The present application relates to the technical field of battery, and discloses a cover plate forming method, a cover plate, a cover plate assembly, a battery and a battery pack, comprising the following steps: S1: processing and forming an initial hole on a metal plate, the initial hole comprising two straight hole edges and two circular arc hole edges, the two straight hole edges being oppositely arranged along a first direction, the two circular arc hole edges being oppositely arranged along a second direction, the two circular arc hole edges being connected to the two ends of the two straight hole edges on the same side, the central angle of the circular arc hole edge being greater than 180°, the distance between the two straight hole edges along the first direction being d, the radius of the circular arc hole edge being r, the units of r and d being mm, and d satisfying d < 2 * r. When the metal plate along the periphery of the initial hole is processed to form a raised edge, the height of the raised edge at each position can be made consistent, thereby ensuring the consistency of the height of the flanging structure finally processed, and improving the pressure riveting effect of the flanging structure on the pole column structure.

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] Terminals are components in a battery used to input and output current. They can be mounted on a cover plate and secured to the upper surface by a flange structure on the cover plate. However, for racetrack-shaped terminals, the processing of the flange structure can easily lead to poor uniformity in its height, affecting the effective riveting of the terminal. Summary of the Invention

[0003] In view of this, the present 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 when processing the flange structure of a racetrack-shaped terminal post, poor uniformity of the flange structure height is easily caused, which affects the riveting effect of the terminal post.

[0004] In a first aspect, the present invention provides a method for forming a cover plate, comprising the steps of:

[0005] S1: An initial hole is formed on a metal sheet. The initial hole includes two straight hole edges and two arc hole edges. The two straight hole edges are arranged at intervals relative to each other along a first direction, and the two arc hole edges are arranged at intervals relative to each other along a second direction. The two arc hole edges are respectively connected to the two ends of the two straight hole edges on the same side. The central angle of the arc hole edge is greater than 180°. The distance between the two straight hole edges along the first direction is d, and the radius of the arc hole edge is r. The units of r and d are both mm, and d < 2 × r.

[0006] 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;

[0007] 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.

[0008] Beneficial effects: By ensuring that the distance d between the two straight hole edges along the first direction and the radius r of the arc hole edge satisfy d < 2 × r, after the initial hole is formed on the metal sheet, the material left at the straight hole edge is more than that left at the arc hole edge. Therefore, when the metal sheet along the periphery of the initial hole is processed to form a convex edge, the height of the convex edge can be made to be consistent at all points, thereby ensuring the consistency of the height of the final flange structure and improving the riveting effect of the flange structure on the pole structure.

[0009] Secondly, the present invention also provides a cover plate, formed using the above-described cover plate forming method, comprising:

[0010] The main body has a first surface and a second surface that are disposed opposite to each other along a third direction, and the main body has a through-hole in the third direction;

[0011] A flange structure is provided, which is connected to the first surface and protrudes from the first surface in a third direction, and the flange structure is provided around the pole hole;

[0012] A cantilever structure is connected to the main body, and the cantilever structure extends out of the hole wall of the pole post hole on a plane perpendicular to a third direction.

[0013] Thirdly, the present invention also provides a cover plate assembly, comprising:

[0014] The aforementioned cover plate;

[0015] 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.

[0016] Fourthly, the present invention also provides a battery, comprising:

[0017] The housing has an opening at least at one end;

[0018] 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;

[0019] A battery cell is disposed within the receiving space, and the battery cell is electrically connected to the electrode structure.

[0020] Fifthly, the present invention also provides a battery pack comprising a plurality of the aforementioned batteries. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic diagram of step S1 in a cover plate forming method according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 The metal sheet shown is a cross-sectional view in the second and third directions;

[0024] Figure 3 This is a schematic diagram of step S21 in a cover plate forming method according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of step S22 in a cover plate forming method according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of step S23 in a cover plate forming method according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of step S3 in a cover plate forming method according to an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of a cover plate assembly according to an embodiment of the present invention;

[0029] Figure 8 for Figure 7 Top view of the cover plate assembly shown;

[0030] Figure 9 for Figure 8 A cross-sectional view along the AA direction.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Protruding edge; 2. Cantilever structure; 3. Flanged structure; 31. Connecting section; 32. Press-fit section; 4. Beveled edge; 5. Straight edge; 6. Main body; 61. First surface; 62. Second surface; 63. Pole post hole; 7. Pole post structure; 71. Pole post body; 72. Insulating component;

[0033] 100. Metal sheet; 101. Initial hole; 1011. Straight hole edge; 1012. Arc hole edge. Detailed Implementation

[0034] 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.

[0035] The following is combined Figures 1 to 9 The following describes embodiments of the present invention.

[0036] According to an embodiment of the present invention, in one aspect, a cover plate forming method is provided, comprising the steps of:

[0037] S1: An initial hole 101 is formed on a metal sheet 100. The initial hole 101 includes two straight hole edges 1011 and two arc hole edges 1012. The two straight hole edges 1011 are arranged relatively spaced along a first direction, and the two arc hole edges 1012 are arranged relatively spaced along a second direction. The two arc hole edges 1012 are respectively connected to the two ends of the two straight hole edges 1011 on the same side. The central angle of the arc hole edge 1012 is greater than 180°. The distance between the two straight hole edges 1011 along the first direction is d, and the radius of the arc hole edge 1012 is r. The units of r and d are both mm, and d < 2 × r.

[0038] S2: The metal plate 100 along the periphery of the initial hole 101 is processed to form a protruding edge 1 that protrudes from the first side to the second side in a third direction;

[0039] S3: The portion of the convex edge 1 near the inner circumference is processed from the second side in the third direction to the first side to form a cantilever structure 2, and the remaining portion of the convex edge 1 forms a flange structure 3.

[0040] By applying the cover plate forming method of this embodiment, the distance d between the two straight hole edges 1011 along the first direction and the radius r of the arc hole edge 1012 satisfy d < 2 × r. Thus, after the initial hole 101 is formed on the metal plate 100, the material left at the straight hole edge 1011 of the metal plate 100 is more than the material left at the arc hole edge 1012. Therefore, when the metal plate 100 along the periphery of the initial hole 101 is processed to form the convex edge 1, the height of the convex edge 1 can be made to be consistent at all points, thereby ensuring the consistency of the height of the finally processed flange structure 3 and improving the riveting effect of the flange structure 3 on the pole post structure 7.

[0041] It is worth noting that for racetrack-shaped pole posts, the orthographic projection of the flange structure formed on the cover plate in the projection plane perpendicular to the thickness direction of the cover plate is also racetrack-shaped. Therefore, in related technologies, the initial hole formed on the metal sheet during the processing of the flange structure is a racetrack-shaped hole. However, when a convex edge is formed by stamping along the periphery of the initial hole, the material feeding height of the metal sheet on the straight edge of the racetrack-shaped initial hole is less than the material feeding height of the metal sheet on the arc edge of the racetrack-shaped initial hole, resulting in poor height consistency of the convex edge, which in turn leads to poor height consistency of the final flange structure.

[0042] Therefore, in this embodiment, when forming the initial hole 101 on the metal plate 100, the shape of the initial hole 101 is limited so that the shape of the initial hole 101 is not a standard racetrack-shaped hole. At this time, the arc-shaped hole edge 1012 is not a semi-circular arc, but an arc shape, so that the distance between the two straight hole edges 1011 is closer, and the metal plate 100 has more material remaining at the straight hole edge 1011 to make up for the material difference between the straight edge and the arc edge when processing the convex edge 1, so that the height of the convex edge 1 at the straight edge and the arc edge tends to be consistent.

[0043] It should be noted that the aforementioned feed height refers to the height of the vertical edge formed when the metal sheet around the initial hole is punched from a horizontal state to a vertical state.

[0044] Specifically, in one embodiment, in step S1, an initial hole 101 is formed on the metal sheet 100 by punching with a punch.

[0045] Specifically, in one embodiment, such as Figure 1 As shown, the distance d between the two straight hole edges 1011 along the first direction and the radius r of the arc hole edge 1012 satisfy 0.05≤2×rd≤1.5. This setting further ensures the consistency of the height of the convex edge 1 formed by the metal plate 100 around the initial hole 101.

[0046] It is worth noting that when the value of 2×rd is too large, the metal sheet 100 leaves too much material at the straight hole edge 1011, which can easily cause the height of the protruding edge 1 on the straight edge to be greater than its height on the arc edge, affecting the consistency of the height of the protruding edge 1. When the value of 2×rd is too small, the metal sheet 100 leaves too little material at the straight hole edge 1011, which is insufficient to compensate for the difference in material flow between the straight edge and the arc edge, and will still affect the consistency of the height of the protruding edge.

[0047] Optionally, 2×rd can be any value from 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, or a value between any two values.

[0048] Specifically, in one embodiment, such as Figure 1 and Figure 2 As shown, the thickness of the metal plate 100 along the third direction is m, where m is in mm, and satisfies 0.08 ≤ m / d ≤ 0.375. This setting further ensures the consistency of the height of the protruding edge 1 formed by machining the metal plate 100 around the initial hole 101.

[0049] Optionally, m / d can be any value from 0.08, 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, 0.35, 0.375, or a value between any two values.

[0050] Specifically, in one embodiment, such as Figure 2 As shown, the thickness m of the metal plate 100 along the third direction satisfies 1.5 ≤ m ≤ 3, where m is in mm. This design ensures the structural strength of the cover plate while facilitating its processing and forming, and avoids the cover plate occupying too much space in the battery, thus affecting the battery's space utilization rate.

[0051] It is worth noting that if the value of m is too large, it will be inconvenient to process the initial hole 101 and form the protruding edge 1 on the metal plate 100, and it will also increase the space occupied by the cover plate, affecting the space utilization rate of the battery. If the value of m is too small, the structural strength of the processed cover plate will be low, affecting the reliability of the battery.

[0052] Optionally, m can take any value from 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, or a value between any two values.

[0053] Specifically, in one embodiment, such as Figure 1 As shown, the distance d between the two straight hole edges 1011 along the first direction satisfies 8≤d≤30, where d is in mm. This setting further ensures the consistency of the height of the convex edge 1 formed by the metal plate 100 around the initial hole 101.

[0054] It is worth noting that if the value of d is too small, the metal sheet 100 will leave too much material at the straight hole edge 1011, which may cause the height of the convex edge 1 on the straight edge to be greater than its height on the arc edge, affecting the consistency of the height of the convex edge 1. If the value of d is too large, the metal sheet 100 will leave too little material at the straight hole edge 1011, which is insufficient to compensate for the difference in material flow between the straight edge and the arc edge, and will still affect the consistency of the height of the convex edge.

[0055] Optionally, d can take any value from 8, 10, 12, 15, 18, 20, 22, 25, 28, 30, or a value between any two values.

[0056] Furthermore, in one embodiment, such as Figure 3 and Figure 4 As shown, step S2 includes:

[0057] S21: The metal plate 100 along the periphery of the initial hole 101 is punched out from the first side to the second side in the third direction to form a bevel 4, and the bevel 4 is set at a predetermined angle with the third direction.

[0058] S22: Shape the hypotenuse 4 so that it becomes a straight edge 5 extending along the third direction.

[0059] It is worth noting that the metal sheet 100 is first stamped to form the bevel 4, and then the bevel 4 is shaped to form the straight edge 5. This avoids excessive stress and deformation when the metal sheet 100 is processed into the straight edge 5 in one go, which could cause cracks at the bend of the straight edge 5 and ensure the structural strength of the cover plate.

[0060] 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.

[0061] Furthermore, in one embodiment, such as Figure 5 As shown, step S2 further includes:

[0062] S23: Stretch the straight edge 5 along the third direction to a predetermined height to form the convex edge 1.

[0063] It is worth noting that the protruding edge 1 is formed by punching out the metal sheet 100 along the periphery of the initial hole 101 in a horizontal plane. If the punching range of the metal sheet 100 is expanded during punching to ensure the height of the protruding edge 1, it will lead to increased processing difficulty and poor processing quality. Therefore, in this embodiment, the punched metal sheet 100 does not need to have an excessively large range. A straight edge 5 with a certain height is first processed, and then the straight edge 5 is stretched to form the protruding edge 1 that reaches the predetermined height. This can ensure processing accuracy and quality while reducing processing difficulty.

[0064] Specifically, in one embodiment, such as Figure 3 As shown, in step S21, the angle between the hypotenuse 4 and the third direction is α°, satisfying 10≤α≤45°. This setting facilitates the subsequent shaping of the hypotenuse 4 into the straight edge 5 while avoiding any impact on the structural strength of the cover plate.

[0065] It is worth noting that if the value of α is too large, the change in the metal sheet 100 relative to the horizontal plane when forming the convex edge 1 will be small, making it difficult to subsequently process the inclined edge 4 into the straight edge 5. If the value of α is too small, the change in the metal sheet 100 relative to the horizontal plane when processing the inclined edge 4 will be too large, which may easily cause the cover plate to crack at the bending point, affecting the structural strength of the cover plate.

[0066] Optionally, α can take any value from 10, 12, 15, 18, 20, 22, 25, 28, 30, 32, 35, 38, 40, 42, 45 or a value between any two values.

[0067] Specifically, in one embodiment, such as Figure 3 As shown, the thickness of the hypotenuse 4 is m1, and the thickness of the straight edge 5 is m2. The units of m1 and m2 are both mm, and m1 > m2. When the straight edge 5 is further processed from the hypotenuse 4, a certain amount of stretching can be generated on the hypotenuse 4 to increase the height of the straight edge 5, which facilitates subsequent processing.

[0068] Specifically, in one embodiment, such as Figure 4 and Figure 5 As shown, the height of the straight edge 5 is h2, and the height of the convex edge 1 is h3. The units of h2 and h3 are both mm, and they satisfy 1≤h3 / h2≤1.5. This setting facilitates the processing and shaping of both the inclined edge 4 and the convex edge 1.

[0069] It is worth noting that if the value of h3 / h2 is too large, the amount of change from the straight edge 5 to the convex edge 1 will be too large, making it difficult to stretch the straight edge 5 and easily affecting the structural strength of the convex edge 1. If the value of h3 / h2 is too small, the straight edge 5 needs to have a large height, and the punching range of the metal sheet 100 needs to be expanded when processing the inclined edge 4, which will lead to increased processing difficulty and poor processing quality.

[0070] Optionally, h3 / h2 can be any value from 1, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5 or a value between any two values.

[0071] Specifically, in one embodiment, such as Figure 4 As shown, the height h2 of the straight edge 5 satisfies 0.5≤h2≤3, where h2 is in mm. This setting facilitates the processing and shaping of both the inclined edge 4 and the convex edge 1.

[0072] It is worth noting that if the value of h2 is too large, the punching range of the metal sheet 100 needs to be expanded when forming the bevel 4, which will increase the processing difficulty and result in poor processing quality. If the value of h2 is too small, the amount of change when stretching to form the convex edge 1 of the predetermined height will be too large, making it difficult to stretch the straight edge 5 and easily affecting the structural strength of the convex edge 1.

[0073] Optionally, h2 can be any value from 0.5, 0.8, 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, or a value between any two values.

[0074] Specifically, in one embodiment, such as Figure 5 As shown, the height h3 of the convex edge 1 satisfies 1≤h3≤3.5, where h3 is in mm. This setting ensures that the height of the flange structure 3 can both guarantee the pressing effect on the pole structure 7 and avoid excessive coverage of the pole structure 7, which would affect the subsequent connection area with the busbar.

[0075] It is worth noting that if the value of h3 is too large, the height of the flanged structure 3 formed during processing will be too large, and the coverage area of ​​the flanged structure 3 on the pole post structure 7 after folding will be too large, resulting in too small an area of ​​the pole post structure 7 remaining for connection with the busbar, affecting the current carrying capacity. If the value of h3 is too small, the height of the flanged structure 3 formed during processing will be too small, and the area of ​​the flanged structure 3 pressed onto the pole post structure 7 after folding will be too small, affecting the pressing effect on the pole post structure 7, and resulting in lower stability of the pole post structure 7.

[0076] Optionally, h3 can be any value from 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5 or a value between any two values.

[0077] Specifically, in one embodiment, such as Figure 4 As shown, the thickness of the straight edge 5 is m2, where m2 is in mm, and satisfies 1 ≤ m2 ≤ 2.5. This design facilitates both the processing and forming of the straight edge 5 and the convex edge 1.

[0078] It is worth noting that if the value of m2 is too large, the height of the straight edge 5 will be too small, resulting in excessive variation when stretching to form the convex edge 1 of the predetermined height. This makes it difficult to stretch the straight edge 5 and may affect the structural strength of the convex edge 1. If the value of m2 is too small, a large amount of stretching is required for the inclined edge 4 when shaping the straight edge 5, leading to a complex processing procedure.

[0079] Optionally, m2 can take any value from 1, 1.2, 1.4, 1.5, 1.6, 1.8, 2, 2.2, 2.4, 2.5 or a value between any two values.

[0080] Specifically, in one embodiment, such as Figure 5 As shown, the thickness of the convex edge 1 is m3, where m3 is in mm, and satisfies 1 ≤ m3 ≤ 2.3. This design reduces the space occupied by the cover plate on the battery while ensuring the structural strength of the flange structure 3.

[0081] It is worth noting that if the value of m3 is too large, the overall thickness of the metal sheet 100 used to process the cover plate will be too large, resulting in increased material consumption and the processed cover plate will occupy too much space, affecting the space utilization rate of the battery. If the value of m3 is too small, the thickness of the processed flange structure 3 will be too small, reducing the structural strength of the flange structure 3 and affecting the reliability of the riveting of the terminal post structure 7.

[0082] Optionally, m3 can take any value from 1, 1.2, 1.4, 1.5, 1.6, 1.8, 1.9, 2, 2.1, 2.2, 2.3 or a value between any two values.

[0083] Specifically, in one embodiment, such as Figure 5 As shown, the thickness of the convex edge 1 is m3. In step S3, the thickness of the portion of the convex edge 1 near the inner circumference that is being compressed is m4. Both m3 and m4 are in mm, and satisfy 0.05≤m4 / m3≤0.35. This configuration ensures both the structural strength of the flange structure 3 and the structural strength of the cantilever structure 2.

[0084] It is worth noting that if the value of m4 / m3 is too large, the remaining thickness of the flange structure 3 will be too small, resulting in lower structural strength of the flange structure 3. This can easily affect the riveting effect of the pole column structure 7 and thus its stability. If the value of m4 / m3 is too small, there will be too little material used to form the cantilever structure 2, resulting in lower structural strength of the cantilever structure 2 and affecting its reliability in supporting the pole column structure 7.

[0085] Optionally, the value of m4 / m3 can be any one of 0.05, 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, or 0.35, or a value between any two of these values.

[0086] Furthermore, in one embodiment, step S3 includes:

[0087] S31: For the portion of the convex edge 1 near the inner circumference, the initial cantilever is formed by pressing from the second side in a third direction toward the first side;

[0088] S32: Flatten the initial cantilever to form a cantilever structure with uniform thickness 2.

[0089] It is worth noting that when the material of the protruding edge 1 is extruded to form the initial cantilever, the material flow of the arc edge and the straight edge of the racetrack-shaped structure is uneven, which 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 2 has a uniform thickness.

[0090] Specifically, in one embodiment, such as Figure 6 As shown, the thickness of the metal plate 100 along the third direction is m, and the thickness of the cantilever structure 2 along the third direction is m6. The units of m and m6 are both mm, and they satisfy 0.3≤m6 / m≤0.7. This setting ensures the structural strength of the cantilever structure 2 while facilitating the riveting of the flange structure 3 to the pole structure 7.

[0091] It is worth noting that if the value of m6 / m is too large, the thickness of the cantilever structure 2 will be too large, the installation height of the pole structure 7 after being installed on the cantilever structure 2 will be too large, and the height of the flange structure 3 used for pressing and riveting the pole structure 7 after folding will be too small, affecting the riveting effect of the flange structure 3 on the pole structure 7. If the value of m6 / m is too small, the thickness of the cantilever structure 2 will be too small, resulting in lower structural strength of the cantilever structure 2 and affecting the reliability of the cantilever structure 2 in supporting the pole structure 7.

[0092] Optionally, m6 / m can be any value from 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7 or a value between any two values.

[0093] Furthermore, in one embodiment, in step S32, after flattening the initial cantilever, a racetrack-shaped hole is punched in the middle of the flattened cantilever, and the remaining part forms the cantilever structure 2.

[0094] 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 racetrack-shaped hole. Therefore, the excess material is punched away in the middle of the flattened cantilever to form a standard racetrack-shaped hole for subsequent assembly of the pole post structure 7.

[0095] In one embodiment, along the enclosing direction of the initial hole 101, the trajectory length of the straight hole edge 1011 is X, and the trajectory length of the arc hole edge 1012 is Y, where the units of X and Y are both mm, and X < Y.

[0096] It is worth noting that the trajectory length of the straight hole edge 1011 is the sum of the side lengths of the two straight hole edges 1011, and the trajectory length of the arc hole edge 1012 is the sum of the arc lengths of the two arc hole edges 1012. According to an embodiment of the present invention, on another aspect, as... Figure 6As shown, a cover plate is also provided, which is formed by the cover plate forming method described above, including: a main body 6 having a first surface 61 and a second surface 62 disposed opposite to each other along a third direction, and a pole post hole 63 being disposed through the main body 6 along the third direction; a flange structure 3 connected to the first surface 61 and protruding from the first surface 61 along the third direction, and the flange structure 3 being disposed around the pole post hole 63; and a cantilever structure 2 connected to the main body 6, and the cantilever structure 2 extending out of the hole wall of the pole post hole 63 on a plane perpendicular to the third direction.

[0097] Furthermore, in one embodiment, such as Figure 6 As shown, the thickness of the flange structure 3 is m5, where m5 is in mm, and satisfies 0.6≤m5≤1.5. This design ensures the structural strength of the flange structure 3 while facilitating its folding.

[0098] It is worth noting that if the value of m5 is too large, the flange structure 3 will be too thick, making it difficult to fold the flange structure 3 when riveting the pole post structure 7. If the value of m5 is too small, the structural strength of the flange structure 3 will be low, affecting the pressing effect of the flange structure 3 on the pole post structure 7 and impacting the stability of the pole post structure 7.

[0099] Optionally, m5 can be any value from 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5 or a value between any two values.

[0100] Furthermore, in one embodiment, such as Figure 6 As shown, the height of the flange structure 3 is h4, where h4 is in mm, and satisfies 1.2 ≤ h4 ≤ 3.5. This setting ensures the pressing effect on the pole structure 7 while avoiding excessive coverage of the pole structure 7, which would affect the subsequent connection area with the busbar.

[0101] It is worth noting that if the value of h4 is too large, the coverage area of ​​the pole post structure 7 after the flange structure 3 is folded will be too large, resulting in too small an area of ​​the pole post structure 7 for connecting with the busbar, thus affecting the current carrying capacity. If the value of h4 is too small, the area of ​​the flange structure 3 pressed onto the pole post structure 7 after folding will be too small, affecting the pressing effect on the pole post structure 7, and the stability of the pole post structure 7 will be low.

[0102] Optionally, h4 can be any value from 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5 or a value between any two values.

[0103] Furthermore, in one embodiment, such as Figure 6As shown, the thickness of the cantilever structure 2 along the third direction is m6, where m6 is in mm, and satisfies 0.6≤m6≤1.8. This design ensures the structural strength of the cantilever structure 2 while facilitating the riveting of the flange structure 3 to the pole structure 7.

[0104] It is worth noting that if the value of m6 is too large, the thickness of the cantilever structure 2 will be too large, the installation height of the pole structure 7 after being installed on the cantilever structure 2 will be too large, and the height of the flange structure 3 used for pressing and riveting the pole structure 7 after folding will be too small, affecting the riveting effect of the flange structure 3 on the pole structure 7. If the value of m6 is too small, the thickness of the cantilever structure 2 will be too small, resulting in lower structural strength of the cantilever structure 2 and affecting the reliability of the cantilever structure 2 in supporting the pole structure 7.

[0105] Optionally, m6 can be any value from 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8 or a value between any two values.

[0106] Furthermore, in one embodiment, such as Figure 6 As shown, on a plane perpendicular to the third direction, the width of the cantilever structure 2 is L, where L is in mm, and satisfies 1.5 ≤ L ≤ 5. This configuration ensures the reliable support of the cantilever structure 2 for the pole structure 7 while facilitating the electrical connection between the battery cell and the pole structure 7.

[0107] It is worth noting that if the value of L is too large, the opening range of the racetrack-shaped hole in the middle of the cantilever structure 2 will be too small, making it difficult for the subsequent battery cell tabs to make electrical connections with the terminal structure 7 through the racetrack-shaped hole. If the value of L is too small, the contact area between the cantilever structure 2 and the terminal structure 7 will be too small, affecting the reliability of the cantilever structure 2 in supporting the terminal structure 7.

[0108] Optionally, L can be any value from 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.2, 4.5, 4.8, 5, or a value between any two values.

[0109] According to another aspect of the present invention, a cover plate assembly is also provided, such as... Figures 7 to 9 As shown, it includes: the cover plate mentioned above; the pole structure 7, which is disposed on the cantilever structure 2, and the flange structure 3 is folded and pressed onto the side of the pole structure 7 away from the cantilever structure 2.

[0110] It should be noted that you should refer to [link / reference]. Figure 9The flange structure 3 includes a connecting section 31 and a pressing section 32. The connecting section 31 is connected between the main body 6 and the pressing section 32. The pressing section 32 is pressed onto the pole structure 7. The pressing section 32 and the connecting section 31 are set at a certain angle.

[0111] Furthermore, in one embodiment, such as Figure 9 As shown, the pole structure 7 includes a pole body 71 and an insulating member 72. The insulating member 72 is arranged around the outer periphery of the pole body 71, and at least part of the insulating member 72 is located between the flange structure 3 and the pole body 71.

[0112] According to an embodiment of the present invention, in another aspect, a battery is also provided, comprising: a housing having an opening at at least one end; the aforementioned cover assembly connected to the housing and sealing the opening, the housing and the cover assembly enclosing a receiving space; and a battery cell disposed within the receiving space, the battery cell being electrically connected to an electrode structure 7.

[0113] It is worth noting that the battery cell includes a tab, which can be directly connected to the terminal structure 7, or the tab is connected to an adapter plate, which is connected to the terminal structure 7.

[0114] According to an embodiment of the present invention, in a final aspect, a battery pack is also provided, comprising a plurality of the aforementioned batteries.

[0115] Furthermore, in one embodiment, the battery pack also includes a busbar that connects the terminal structures 7 of two batteries to enable the series or parallel connection of several batteries.

[0116] 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 (100). The initial hole (101) includes two straight hole edges (1011) and two circular arc hole edges (1012). The two straight hole edges (1011) are arranged relatively apart along a first direction, and the two circular arc hole edges (1012) are arranged relatively apart along a second direction. The two circular arc hole edges (1012) are respectively connected to the two ends of the two straight hole edges (1011) on the same side. The central angle of the circular arc hole edge is greater than 180°. The distance between the two straight hole edges (1011) along the first direction is d, and the radius of the circular arc hole edge (1012) is r. The units of r and d are both mm, and d < 2 × r. S2: The metal plate (100) along the periphery of the initial hole (101) is processed to form a protruding edge (1) that protrudes from the first side to the second side in the third direction. S3: The part of the convex edge (1) near the inner circumference is processed from the second side of the third direction to the first side to form a cantilever structure (2), and the remaining part of the convex edge (1) forms a flange structure (3).

2. The cover plate forming method according to claim 1, characterized in that, The distance d between the two straight hole edges (1011) along the first direction and the radius r of the circular hole edge (1012) satisfy 0.05≤2×rd≤1.

5.

3. The cover plate forming method according to claim 2, characterized in that, The thickness of the metal sheet (100) along the third direction is m, where m is in mm, and satisfies 0.08≤m / d≤0.

375.

4. The cover plate forming method according to claim 3, characterized in that, The thickness m of the metal sheet (100) along the third direction satisfies 1.5≤m≤3, where m is in mm.

5. The cover plate forming method according to claim 3, characterized in that, The distance d between the two straight hole edges (1011) along the first direction satisfies 8≤d≤30, where the unit of d is mm.

6. The cover plate forming method according to any one of claims 1 to 5, characterized in that, Step S2 includes: S21: The metal plate (100) along the periphery of the initial hole (101) is punched out from the first side to the second side in the third direction to form a bevel (4), and the bevel (4) is set at a predetermined angle with the third direction; S22: Shape the hypotenuse (4) to form a straight edge (5) extending along the third direction.

7. The cover plate forming method according to claim 6, characterized in that, Step S2 also includes: S23: Stretch the straight edge (5) along the third direction to a predetermined height to form the convex edge (1).

8. The cover plate forming method according to claim 6, characterized in that, In step S21, the angle between the hypotenuse (4) and the third direction is α°, satisfying 10≤α≤45.

9. The cover plate forming method according to claim 6, characterized in that, The thickness of the hypotenuse (4) is m1, and the thickness of the straight side (5) is m2. The units of m1 and m2 are both mm, and m1 > m2.

10. The cover plate forming method according to claim 7, characterized in that, The height of the straight edge (5) is h2, and the height of the convex edge (1) is h3. The units of h2 and h3 are both mm, and they satisfy 1≤h3 / h2≤1.

5.

11. The cover plate forming method according to claim 10, characterized in that, The height h2 of the straight edge (5) satisfies 0.5≤h2≤3, and the unit of h2 is mm.

12. The cover plate forming method according to claim 10, characterized in that, The height h3 of the convex edge (1) satisfies 1≤h3≤3.5, and the unit of h3 is mm.

13. The cover plate forming method according to claim 7, characterized in that, The thickness of the straight edge (5) is m2, where m2 is in mm, and satisfies 1≤m2≤2.

5.

14. The cover plate forming method according to claim 7, characterized in that, The thickness of the protruding edge (1) is m3, where m3 is in mm, and satisfies 1≤m3≤2.

3.

15. The cover plate forming method according to any one of claims 1 to 5, characterized in that, The thickness of the protruding edge (1) is m3. In step S3, the thickness of the part of the protruding edge (1) near the inner circumference that is being squeezed is m4. The units of m3 and m4 are both mm, and they satisfy 0.05≤m4 / m3≤0.

35.

16. The cover plate forming method according to any one of claims 1 to 5, characterized in that, Step S3 includes: S31: For the part of the convex edge (1) near the inner circumference, the first cantilever is formed by pressing from the second side in the third direction to the first side; S32: Flatten the initial cantilever to form a cantilever structure with uniform thickness (2).

17. The cover plate forming method according to claim 16, characterized in that, The thickness of the metal plate (100) along the third direction is m, and the thickness of the cantilever structure (2) along the third direction is m6. The units of m and m6 are mm, and 0.3≤m6 / m≤0.7 is satisfied.

18. The cover plate forming method according to claim 16, characterized in that, In step S32, after flattening the initial cantilever, a racetrack-shaped hole is punched in the middle of the flattened cantilever, and the remaining part forms the cantilever structure (2).

19. The cover plate forming method according to any one of claims 1 to 5, characterized in that, Along the enclosing direction of the initial hole (101), the trajectory length of the straight hole edge (1011) is X, and the trajectory length of the circular arc hole edge (1012) is Y. The units of X and Y are both mm, and X < Y.

20. A cover plate, formed by the cover plate forming method according to any one of claims 1 to 19, characterized in that, include: The main body (6) has a first surface (61) and a second surface (62) disposed opposite to each other along a third direction, and the main body (6) has a through-hole (63) along a third direction. A flange structure (3) is connected to the first surface (61) and protrudes from the first surface (61) in a third direction. The flange structure (3) is arranged around the pole hole (63). A cantilever structure (2) is connected to the main body (6), and the cantilever structure (2) extends the hole wall of the pole hole (63) on a plane perpendicular to the third direction.

21. The cover plate according to claim 20, characterized in that, The thickness of the flange structure (3) is m5, where m5 is in mm, and satisfies 0.6≤m5≤1.

5.

22. The cover plate according to claim 20, characterized in that, The height of the flange structure (3) is h4, where h4 is in mm, and satisfies 1.2≤h4≤3.

5.

23. The cover plate according to claim 20, characterized in that, The thickness of the cantilever structure (2) along the third direction is m6, where m6 is in mm, and satisfies 0.6≤m6≤1.

8.

24. The cover plate according to claim 20, characterized in that, On a plane perpendicular to the third direction, the width of the cantilever structure (2) is L, where the unit of L is mm, and satisfies 1.5≤L≤5.

25. A cover plate assembly, characterized in that, include: The cover plate according to any one of claims 20 to 24; The pole structure (7) is disposed on the cantilever structure (2), and the flange structure (3) is folded and pressed onto the side of the pole structure (7) away from the cantilever structure (2).

26. A battery, characterized in that, include: The housing has an opening at least at one end; The cover plate assembly of claim 25 is connected to the housing and seals the opening, wherein the housing and the cover plate assembly enclose a receiving space; The battery cell is disposed within the accommodating space and is electrically connected to the electrode structure (7).

27. A battery pack, characterized in that, Includes several batteries as described in claim 26.

Images