Cover plate and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate and a battery. The first convex rib is arranged on the cover plate body, the first convex rib protrudes out of the plane where the cover plate body is located in the first direction, the first convex rib comprises an annular rib and a positioning rib, the annular rib is arranged around the center point of the cover plate body, and the positioning rib is formed by extending part of the peripheral surface of the annular rib in the direction away from the center point; the peripheral surfaces of the positioning ribs and the edge of the cover plate body are arranged at intervals; the second convex rib is arranged on the cover plate body and protrudes out of the plane where the cover plate body is located in the first direction, the second convex rib is located on the inner circumferential side of the first convex rib, the second convex rib is annular, and the second convex rib and the first convex rib are arranged at intervals. The cover plate is of a concave-convex alternate structure in the radial direction, the strength and toughness of the cover plate can be improved, and meanwhile, through cooperation of the positioning ribs and the inner wall of the shell, it is guaranteed that the cover plate and the center of the shell are positioned.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cover plate and a battery. Background Art

[0002] The cover plate is set at the open end of the battery shell to close the shell and fix the electrode group inside the battery. It is an important component of the battery. In cylindrical batteries, the cover plate is usually circular, and the cover plate is welded to the shell through its edge to achieve the connection between the cover plate and the shell. As the diameter of the battery increases, the radial dimension of the cover plate increases, and the strength of the cover plate decreases. The strength of the cover plate directly affects the strength of the entire battery. If the strength of the cover plate is low, it is difficult to ensure the support of the cover plate to the electrode group, and the electrode group is prone to loosening, affecting the stability of the battery's electrical performance. In addition, the cover plate is easily damaged, which brings huge safety hazards to the battery. Utility Model Content

[0003] In view of this, the utility model provides a cover plate and a battery to solve the problem of low strength of the cover plate.

[0004] In the first aspect, the utility model provides a cover plate, comprising: a cover plate body; a first convex rib, arranged on the cover plate body, the first convex rib protruding out of the plane where the cover plate body is located along a first direction, the first convex rib comprising an annular rib and a positioning rib, the annular rib being arranged around the center point of the cover plate body, the positioning rib being formed by extending from a partial area of ​​the outer peripheral surface of the annular rib in a direction away from the center point, and the outer peripheral surface of the positioning rib being spaced apart from the edge of the cover plate body; a second convex rib, arranged on the cover plate body and protruding out of the plane where the cover plate body is located along the first direction, the second convex rib being located on the inner peripheral side of the first convex rib, the second convex rib being annular and spaced apart from the first convex rib.

[0005] Beneficial effects: By providing the first rib and the second rib spaced apart from each other on the cover body, and the first rib includes an annular rib in a ring shape and the second rib is in a ring shape, the cover has an alternating concave and convex structure in the radial direction, which can improve the strength and toughness of the cover. And by providing that the first rib further includes positioning ribs connected to the outer circumferential surface of the annular rib, a strengthened portion extending locally in the radial direction is added to the first rib on the basis of the annular rib. The positioning ribs, as strengthening ribs, further increase the strengthening effect of the first rib on the radial strength of the cover. Thus, the combination of the first rib and the second rib can strengthen the strength of the cover in the circumferential direction and also strengthen the radial strength of the cover, thereby enhancing the overall strength and toughness of the cover and improving the reliability of the cover. At the same time, by providing a gap between the outer circumferential surface of the positioning rib and the edge of the cover body, a certain distance from the positioning rib to the edge of the cover is ensured. Thus, when assembling the cover with the housing of the battery, it is convenient to insert the positioning rib into the housing, and through the cooperation between the positioning rib and the inner wall of the housing, the center positioning of the cover and the housing is ensured, which is convenient for assembly and positioning.

[0006] In an optional embodiment, a mating surface is formed in the area on the cover body located on the outer circumferential side of the first rib, and a welding surface is formed in a circle on the mating surface located on the outer circumferential side of the positioning rib, and the welding surface is adapted to be welded to the open end of the housing.

[0007] Beneficial effects: The cover body forms a sealed space through the cooperation of the mating surface with the open end of the housing, and by providing the edge of the mating surface as a welding surface and welding the welding surface to the housing, the connection between the cover and the housing is realized. The welding connection method is stable and reliable, which is beneficial to ensuring the safety of the battery.

[0008] In an optional embodiment, the radial dimension D1 of the welding surface is equal to the wall thickness T of the side wall of the housing; and / or, the value range of the height H of the positioning rib is: 0.5T < H < 6 mm; and / or, a guiding surface is formed on the outer circumferential surface of the positioning rib, and the guiding surface is adapted to cooperate with the inner wall of the housing, and the value range of the angle θ between the guiding surface and the welding surface is 90° ≤ θ < 180°.

[0009] Beneficial effects: By setting the radial dimension D1 of the welding surface equal to the wall thickness T of the side wall of the housing, it is convenient to realize the cooperation between the welding surface and the side wall of the housing, thereby improving the welding quality. By setting the angle between the guiding surface and the welding surface to be in the range of 90° - 180°, it can not only ensure the smooth assembly of the cover and the housing, but also ensure that the guiding surface plays a good guiding and positioning role.

[0010] In an optional embodiment, the number of the positioning ribs is at least two, and at least two of the positioning ribs are evenly distributed at equal intervals in the circumferential direction around the annular rib.

[0011] Beneficial effect: By arranging at least two positioning ribs at equal intervals around the annular rib in the circumferential direction, it is easy to design and process. The positioning ribs cooperate with the inner wall of the shell to ensure the center positioning between the cover plate and the shell. The distribution uniformity of the positioning ribs is good, which can evenly improve the radial strength of the cover plate, thereby increasing the reliability of the cover plate.

[0012] In an optional embodiment, the circumferential length of the positioning rib is L=2πRα / 180°, wherein R is the radius of the circle on which the outer circumference of the positioning rib is located, and α is the angle between the two sides of the positioning rib along the circumference of the annular rib and the line connecting the center point, and 0°<α<180°.

[0013] Beneficial effect: The circumferential length L of the positioning rib 102 is calculated by the formula 2πRα / 180°. The circumferential length of the positioning rib is linked to the radius R of the positioning rib and the angle α occupied by the positioning rib. The circumferential length of the positioning rib is calculated according to actual needs. The calculation process is simple, the result is reliable, and the processing accuracy can be improved.

[0014] In an optional embodiment, the cover plate further comprises: an injection area, the injection area is arranged at the center of the cover plate body, the injection area protrudes from the plane where the cover plate body is located along the first direction, and an injection hole is opened in the injection area.

[0015] Beneficial effect: By setting an injection area at the center position of the cover body and opening an injection hole on the injection area, a channel is provided for injecting electrolyte into the battery, and by setting the injection area to protrude from the plane where the cover body is located in a first direction, a relatively concave second concave area is formed on the cover body between the injection area and the second convex rib, and the second concave area is concave in a direction away from the interior of the shell, and cooperates with the second convex rib and the injection area to further increase the strength and toughness of the cover.

[0016] In an optional embodiment, on the cover plate body, a first recessed area is formed between the first convex rib and the second convex rib; and a second recessed area is formed between the second convex rib and the liquid injection area.

[0017] Beneficial effect: along the radial direction of the cover plate from the center of the cover plate to the edge of the cover plate, the injection area, the second recessed area, the second convex rib, the first recessed area, the first convex rib, and the matching surface are connected in sequence, and the cover plate as a whole has an alternating concave and convex structure. The recessed area cooperates with the convex rib to enhance the strength and toughness of the cover plate.

[0018] In an optional embodiment, an explosion-proof notch is provided on a side of the second convex rib facing away from the first direction, and the explosion-proof notch is provided in at least a partial area of ​​the second convex rib along the circumference of the second convex rib.

[0019] Beneficial effect: An explosion-proof notch is provided in the second convex rib to form an explosion-proof valve. The remaining thickness at the position corresponding to the explosion-proof notch is less than the thickness at other positions on the cover plate. When the air pressure in the battery reaches a certain value, the explosion-proof notch is broken first to form an exhaust channel to discharge the gas in the battery, thereby preventing the battery from exploding due to excessive internal air pressure and improving the safety of the battery.

[0020] In an optional implementation, the area of ​​the cover plate is S, and the area of ​​the region enclosed by the explosion-proof notch is S1, wherein 0.2≤S1 / S≤0.95.

[0021] Beneficial effect: Setting the ratio between the area enclosed by the explosion-proof notch and the area of ​​the cover plate between 0.2-0.95 can not only ensure the strength of the cover plate itself, but also ensure that there is sufficient exhaust area after the explosion-proof valve is opened, thereby improving the reliability of the cover plate and the safety of the battery.

[0022] In a second aspect, the utility model further provides a battery, comprising: a shell provided with an open end; a pole group installed inside the shell; and the above-mentioned cover plate, provided at the open end of the shell to close the shell.

[0023] Since the battery includes a cover plate, it has the same effect as the cover plate and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the structure of the cover plate of an embodiment of the utility model;

[0026] Figure 2 for Figure 1 A is a partial enlarged schematic diagram;

[0027] Figure 3 for Figure 1 A schematic structural diagram of the cover plate from a back side perspective;

[0028] Figure 4 for Figure 1 A front view of the cover shown;

[0029] Figure 5 for Figure 4 Cross-section along the middle BB direction;

[0030] Figure 6 This is a schematic diagram of the structure of another cover plate according to an embodiment of the utility model;

[0031] Figure 7 for Figure 6 A schematic structural diagram of the cover plate from a back side perspective;

[0032] Figure 8 for Figure 6 A front view of the cover shown;

[0033] Fig. 9 for Figure 8 Cross-sectional view in the mid-CC direction;

[0034] Fig.10 is a schematic diagram of the structure of the cover plate when the first convex rib only includes annular ribs;

[0035] Fig.11 It is a schematic diagram of the structure of the battery of the utility model;

[0036] Fig.12 for Fig.11 a cross-sectional view of the battery shown;

[0037] Fig.13 Fig.12 A partial enlarged schematic diagram of D in the middle.

[0038] Description of reference numerals:

[0039] 10. Cover plate; 1. First convex rib; 101. Annular rib; 102. Positioning rib; 103. Guide surface; 2. Second convex rib; 201. Explosion-proof notch; 3. Matching surface; 301. Welding surface; 302. Auxiliary surface; 4. Liquid injection area; 401. Liquid injection hole; 5. First recessed area; 6. Second recessed area; 7. Shell. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0041] Combine the following Figures 1 to 13 , describing an embodiment of the utility model.

[0042] According to an embodiment of the present utility model, on the one hand, a cover plate 10 is provided, such as Figures 1 to 9As shown, the cover plate 10 includes: a cover plate body, a first convex rib 1 and a second convex rib 2. The first convex rib 1 is arranged on the cover plate body, and the first convex rib 1 protrudes out of the plane where the cover plate body is located along the first direction. The first convex rib 1 includes an annular rib 101 and a positioning rib 102. The annular rib 101 is arranged around the center point of the cover plate body, and the positioning rib 102 is formed by a partial area of ​​the outer peripheral surface of the annular rib 101 extending in a direction away from the center point, and the outer peripheral surface of the positioning rib 102 is spaced apart from the edge of the cover plate body; the second convex rib 2 is arranged on the cover plate body and protrudes out of the plane where the cover plate body is located along the first direction. The second convex rib 2 is located on the inner peripheral side of the first convex rib 1, and the second convex rib 2 is annular and spaced apart from the first convex rib 1. Among them, the first direction refers to Figure 5 The “first direction” indicated by the middle arrow means that the first rib 1 and the second rib 2 protrude from the surface of the cover body in the same direction; the center point of the cover body is the center point of the entire cover 10, and the annular rib 101 is concentrically arranged with the second rib 2; the outer peripheral surface refers to the surface on one side of the cover body radially away from the center point; the inner peripheral side of the first rib 1 refers to the side of the first rib 1 along the radial direction of the cover body pointing to the center point.

[0043] The cover plate 10 of the present embodiment is applied, by arranging the first convex rib 1 and the second convex rib 2 which are spaced from each other on the cover plate body, and the first convex rib 1 includes the annular annular rib 101 and the second convex rib 2 is annular, then the cover plate 10 is in a concave-convex alternating structure along the radial direction, which can improve the strength and toughness of the cover plate 10, and by arranging the first convex rib 1 also including the positioning rib 102 connected to the outer peripheral surface of the annular rib 101, the first convex rib 1 is increased with a reinforcement portion extending locally in the radial direction on the basis of the annular rib, and the positioning rib 102 as a strong rib further increases the reinforcement effect of the first convex rib 1 on the radial strength of the cover plate 10, thereby The combination of the first convex rib 1 and the second convex rib 2 can not only strengthen the strength of the cover plate 10 in the circumferential direction, but also strengthen the radial strength of the cover plate 10, thereby strengthening the overall strength and toughness of the cover plate 10 and improving the reliability of the cover plate 10. At the same time, the outer peripheral surface of the positioning rib 102 is spaced from the edge of the cover plate body to ensure that there is a certain distance between the positioning rib 102 and the edge of the cover plate 10, so that when the cover plate 10 is assembled with the battery shell 7, the positioning rib 102 is convenient to extend into the shell 7. The positioning rib 102 cooperates with the inner wall of the shell 7 to ensure that the cover plate 10 and the shell 7 are centrally positioned, which is convenient for assembly and positioning.

[0044] Preferably, the first convex rib 1 and the second convex rib 2 are both formed by stamping the cover plate body, and the cover plate 10 is integrally formed, which is simple to process and has high reliability.

[0045] In one embodiment, the area on the outer peripheral side of the first convex rib 1 on the cover body forms a mating surface 3, and a circle on the mating surface 3 on the outer peripheral side of the positioning rib 102 forms a welding surface 301, and the welding surface 301 is suitable for welding with the open end of the shell 7. It should be noted that the outer peripheral side refers to the side away from the center of the cover body 10 along the radial direction of the cover body, the first convex rib 1 protrudes from the plane where the mating surface 3 is located, and the welding surface 301 is a circle on the mating surface 3 on the outer peripheral side of the positioning rib 102, that is, the welding surface 301 is a circle on the surface at the edge of the entire cover 10, and the welding surface 301 does not interfere with the convex rib. The cover body cooperates with the open end of the shell 7 through the mating surface 3 to form a closed space, and the edge of the mating surface 3 is set as the welding surface 301, and the welding surface 301 is welded to the shell to achieve the connection between the cover 10 and the shell 7. The welding connection method is stable and reliable, which is conducive to ensuring the safety of the battery.

[0046] Preferably, the battery is a cylindrical battery, the cover plate 10 is circular, the annular rib 101 and the second convex rib 2 are both circular and concentrically arranged, the positioning rib 102 extends radially along the cover plate in the annular region where the mating surface 3 is located, and the positioning rib 102 strengthens the strength of the annular region where the mating surface 3 is located. It can be understood that, as an alternative embodiment, the annular rib 101 can also be a triangular, quadrilateral or other annular shape.

[0047] In one embodiment, further combining Figure 2 and Fig.13 As shown, the radial dimension D1 of the welding surface 301 is equal to the wall thickness T of the side wall of the shell 7. The welding surface 301 is used for welding with the end face of the side wall of the shell 7. By setting the radial dimension D1 of the welding surface 301 equal to the wall thickness T of the side wall of the shell 7, it is easy to achieve the matching of the welding surface 301 and the side wall of the shell 7, thereby improving the welding quality.

[0048] In one embodiment, the thickness T of the side wall of the shell 7 is in the range of 0.15 mm to 1.2 mm, which can ensure that the shell 7 has sufficient strength and avoid excessive weight of the battery due to the shell 7 being too thick.

[0049] Specifically, further combining Figure 2 As shown, the mating surface 3 includes a welding surface 301 and an auxiliary surface 302. The annular area between the circular area where the positioning rib 102 is away from the annular rib 101 and the outer contour line of the cover plate 10 is the welding surface 301 (i.e. Figure 2(the area between the dashed line on the mating surface 3 and the outer contour line of the cover plate 10), the area between the inner circle of the ring where the welding surface 301 is located and the circle where the side of the annular rib 101 away from the center of the cover plate is located is the auxiliary surface 302. It can be seen that the radial dimension D1 of the welding surface 301 is small, but the total radial dimension D2 of the welding surface 301 plus the auxiliary surface 302 (that is, the distance between the outer peripheral surface of the annular rib 101 and the outer contour of the cover plate 10) is relatively sufficient, D2 > D1. Compared with the traditional structure where the entire mating surface 3 is a narrow circle, only the position corresponding to the positioning rib 102 on the mating surface 3 of this embodiment is narrow, and there is a wide margin at the position not corresponding to the positioning rib 102, which is convenient for machining the mating surface 3 and ensuring the flatness of the welding surface 301.

[0050] In one embodiment, the value range of the height H of the positioning rib 102 is: 0.5T < H < 6 mm. The height of the positioning rib 102 refers to the distance that the positioning rib 102 protrudes from the cover plate body, that is, the distance between the surface of the positioning rib 102 facing the first direction and the surface of the mating surface 3 facing the first direction. The annular rib 101 has the same height as the positioning rib 102, and the height of the positioning rib 102 is the height of the first rib 1. If the height of the positioning rib 102 is less than or equal to 0.5T, the height of the positioning rib 102 is too small and the strength is insufficient, making it difficult to achieve the purpose of improving the strength of the cover plate. If the height of the positioning rib 102 is greater than or equal to 6 mm, the height of the positioning rib 102 is too large, occupying too much space along its height direction, and it is easy to squeeze the electrode group inside the battery and cause damage to the electrode group. Therefore, setting the height of the positioning rib 102 to be between 0.5T and 6 mm can not only ensure the improvement of the strength of the cover plate, but also avoid squeezing the electrode group, thereby improving the reliability of the cover plate and the safety of the entire battery.

[0051] In one embodiment, the outer peripheral surface of the positioning rib 102 forms a guide surface 103, and the guide surface 103 is suitable for matching with the inner wall of the shell 7. The value range of the angle θ between the guide surface 103 and the welding surface 301 is 90°≤θ<180°. It should be noted that the positioning rib 102 is farther away from the center point of the cover plate 10 and closer to the edge of the cover plate 10 than the annular rib 101. The circumferential surface of the positioning rib 102 on the side away from the annular rib 101 is the position on the first convex rib 1 closest to the edge of the cover plate. During the assembly process of the cover plate 10 and the shell 7, the first convex rib 1 faces the inner side of the shell 7. By setting the outer peripheral surface of the first convex rib 1 closest to the edge of the cover plate 10 as the guide surface 103, the guide surface 103 matches with the inner wall of the shell 7 to provide guidance and positioning for the installation of the cover plate 10, which is convenient for installing the cover plate 10 on the shell 7, can reduce the difficulty of assembly and improve the assembly accuracy; after the cover plate 10 is assembled with the shell 7, the guide surface 103 faces the inner wall of the shell 7, and the welding surface 301 is located at the inner wall of the shell 7. 1 faces the end face of the shell 7, the welding surface 301 and the end face of the shell 7 are matched with zero clearance, and the angle between the inner wall of the side wall of the shell 7 and the end face is 90°. If the angle between the guide surface 103 and the welding surface 301 is less than 90°, it is not convenient to install the rib on the cover plate 10 into the shell 7. If the angle between the guide surface 103 and the welding surface 301 is greater than or equal to 180°, the angle between the two is too large, the guide surface 103 is too far away from the inner wall of the shell 7, and the guide surface 103 loses its guiding and positioning function. Therefore, setting the angle between the guide surface 103 and the welding surface 301 to a value between 90° and 180° can not only ensure the smooth assembly of the cover plate and the shell 7, but also ensure that the guide surface 103 plays a good guiding and positioning role.

[0052] In one embodiment, the number of the positioning ribs 102 is at least two, and at least two positioning ribs 102 are evenly spaced around the circumference of the annular rib 101. By arranging at least two positioning ribs 102 evenly spaced around the circumference of the annular rib 101, it is easy to design and process. The positioning ribs 102 cooperate with the inner wall of the shell 7 to ensure the center positioning between the cover plate 10 and the shell 7. The distribution uniformity of the positioning ribs 102 is good, which can evenly improve the radial strength of the cover plate 10, thereby increasing the reliability of the cover plate 10.

[0053] In one embodiment, Figures 1 to 5 As shown, there are three positioning ribs 102 , which are evenly arranged along the circumference of the annular rib 101 . The three positioning ribs 102 can improve the uniformity of the circumferential force of the annular rib 101 , thereby ensuring the uniformity of the radial strength of the cover plate 10 .

[0054] In addition, in other embodiments, Figures 6 to 9As shown, there are four positioning ribs 102 , and the four positioning ribs 102 are evenly arranged along the axial direction of the annular rib 101 , which can also ensure the uniformity of the circumferential force of the annular rib 101 and the uniformity of the radial strength of the cover plate 10 .

[0055] It should be noted that if Fig.10 As shown, the radial dimension D1 of the welding surface 301 is equal to the distance D2 between the outer peripheral side of the annular rib 101 and the outer contour of the cover plate 10, and the first convex rib 1 only includes the annular rib 101, and there is no positioning rib 102. At this time, the first convex rib 1 is the same as the reinforcing rib on the traditional cover plate, and only has the function of strengthening the circumferential strength of the ring where the annular rib 101 is located, but has no function of strengthening the radial strength of the cover plate.

[0056] In one embodiment, the circumferential length L of the positioning rib 102 is 2πRα / 180°, where R is the radius of the circle where the outer circumference of the positioning rib 102 is located, and α is the angle between the two sides of the positioning rib 102 along the circumference of the annular rib 101 and the center point, and 0°<α<180°. Figure 2 As shown, the circumferential length L of the positioning rib 102 refers to the length of the arc projected by the positioning rib 102 on the circle on its outer circumference. The circumferential length L of the positioning rib 102 is calculated by the formula 2πRα / 180°. The circumferential length of the positioning rib 102 is linked to the radius R of the positioning rib 102 and the angle α occupied by the positioning rib 102. The circumferential length of the positioning rib 102 is calculated according to actual needs. The calculation process is simple, the result is reliable, and the processing accuracy can be improved.

[0057] Preferably, at the outer peripheral side of the positioning rib 102, both sides of the positioning rib 102 along the circumference of the annular rib 101 are rounded, which can reduce stress concentration at the corners, improve the strength of the cover plate, and facilitate processing.

[0058] In one embodiment, the cover plate further comprises: a liquid injection area 4, which is arranged at the center of the cover plate body, the liquid injection area 4 protrudes from the plane where the cover plate body is located in the first direction, and a liquid injection hole 401 is provided in the liquid injection area 4. By arranging the liquid injection area 4 at the center of the cover plate body and providing the liquid injection hole 401 in the liquid injection area 4, a channel for injecting electrolyte into the battery is improved, and by arranging the liquid injection area 4 protruding from the plane where the cover plate body is located in the first direction, a relatively concave second concave area 6 is formed on the portion of the cover plate body between the liquid injection area 4 and the second convex rib 2, and the second concave area 6 is concave in a direction away from the inside of the shell, and cooperates with the second convex rib 2 and the liquid injection area 4 to further increase the strength and toughness of the cover plate 10.

[0059] Preferably, the distance that the injection area 4 protrudes from the cover body along the first direction is equal to the distance that the second rib 2 and the first rib 1 protrude from the cover body along the first direction; the injection area 4 is located at the center of the cover body, that is, the center of the cover; the injection hole 401 is circular for easy processing.

[0060] In one embodiment, on the cover plate body, a first recessed area 5 is formed between the first convex rib 1 and the second convex rib 2; a second recessed area 6 is formed between the second convex rib 2 and the injection area 4. Along the radial direction of the cover plate 10, from the center of the cover plate 10 to the edge of the cover plate 10, the injection area 4, the second recessed area 6, the second convex rib 2, the first recessed area 5, the first convex rib 1, and the matching surface 3 are connected in sequence, and the cover plate as a whole has an alternating concave and convex structure, and the recessed area cooperates with the convex rib to enhance the strength and toughness of the cover plate 10.

[0061] In one embodiment, an explosion-proof notch 201 is provided on the side of the second rib 2 that is away from the first direction, and the explosion-proof notch 201 is provided in at least a portion of the second rib 2 along the circumference of the second rib 2. By providing the explosion-proof notch 201 in the second rib 2, an explosion-proof valve is formed, and the remaining thickness at the position corresponding to the explosion-proof notch 201 is less than the thickness at other positions on the cover plate. When the air pressure in the battery reaches a certain value, the explosion-proof notch 201 will break first, forming an exhaust channel to discharge the gas in the battery, thereby preventing the battery from exploding due to excessive internal air pressure, and improving the safety of the battery. It should be noted that when the air pressure in the battery reaches a certain value, the explosion-proof valve will open along the explosion-proof notch 201, and the explosion-proof notch 201 is provided in the second rib 2. The direction of the explosion-proof notch 201 is consistent with the direction of the second rib 2. The explosion-proof notch 201 can be set as follows: Figure 3 to Figure 4 , Figures 7 and 8 The "C" shape shown is arranged in a partial area of ​​the second convex rib 2 along the circumference of the second convex rib 2; it can be understood that, as an alternative embodiment, the explosion-proof notch 201 can be arranged in a form of a complete circle around the circumference of the second convex rib 2.

[0062] Preferably, in the cross section parallel to the plane where the cover plate axis is located, the explosion-proof notch 201 can be V-shaped, U-shaped, trapezoidal, etc., for easy processing. When the cover plate is mounted on the housing 7, the explosion-proof notch 201 is located on the side of the cover plate facing the outside of the housing 7.

[0063] In one embodiment, the area of ​​the cover plate is S, and the area of ​​the region enclosed by the explosion-proof notch 201 is S1, wherein 0.2≤S1 / S≤0.95. It should be noted that the area of ​​the cover plate refers to the projected area of ​​the cover plate on a plane perpendicular to its axis, and the area of ​​the area enclosed by the explosion-proof notch 201 refers to the projected area of ​​the area enclosed by the explosion-proof notch 201 on the cover plate. If the ratio between the area of ​​the area enclosed by the explosion-proof notch 201 and the area of ​​the cover plate is less than 0.2, the area occupied by the explosion-proof valve on the cover plate is too small. When the explosion-proof valve is opened, the exhaust channel is too small and the gas in the battery cannot be discharged in time, which is very dangerous. If the ratio between the area of ​​the area enclosed by the explosion-proof notch 201 and the area of ​​the cover plate is greater than 0.95, the area occupied by the explosion-proof valve on the cover plate is too large, which will reduce the strength of the cover plate. Therefore, setting the ratio between the area of ​​the area enclosed by the explosion-proof notch 201 and the area of ​​the cover plate between 0.2-0.95 can not only ensure the strength of the cover plate itself, but also ensure that there is sufficient exhaust area after the explosion-proof valve is opened, thereby improving the reliability of the cover plate and the safety of the battery.

[0064] According to an embodiment of the present utility model, on the other hand, a battery is also provided, such as Figures 11 to 13 As shown, the battery includes: a shell 7, a pole group and the above-mentioned cover plate 10. The shell 7 is provided with an open end; the pole group is installed inside the shell 7; the cover plate 10 is arranged at the open end of the shell 7 to close the shell 7. Since the circumferential strength and radial strength of the cover plate 10 are relatively strong, the overall strength and reliability of the battery can be improved. The cover plate 10 and the shell 7 form a closed container, in which the pole group is placed, and the cover plate 10 is electrically connected to the pole group to introduce the current of the pole group to the outside of the shell. The first rib 1 and the second rib 2 on the cover plate 10 protrude toward the inside of the shell 7, and the welding surface 301 on the mating surface 3 matches and is welded with the surface of the open end of the shell 7 to achieve the connection between the cover plate 10 and the shell 7. It should be noted that Figure 12 to Figure 13 The placement direction of the cover plate 10 in Figure 5 , Fig. 9 The perspective shown is reversed.

[0065] Preferably, the battery is a cylindrical battery, the outer contour line of the cover plate is circular, and the annular rib 101 is in a circular ring shape.

[0066] In this embodiment, the cover plate is designed as a whole with a structure in which grooves and convex ribs alternate with each other, wherein the first convex rib 1 includes an annular rib 101 and a positioning rib 102 extending radially, thereby ensuring the strength and toughness of the cover plate 10 in the circumferential and radial directions, and ensuring the stability of the performance of the explosion-proof valve arranged on the cover plate 10; and the welding surface 301 and the guide surface 103 are designed to ensure the reliability of the welding between the shell 7 and the cover plate 10.

[0067] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cover plate, characterized in that: include: Cover plate body; a first convex rib, arranged on the cover body, the first convex rib protruding from the plane where the cover body is located in a first direction, the first convex rib comprising an annular rib and a positioning rib, the annular rib being arranged around the center point of the cover body, the positioning rib extending from a portion of the outer circumference of the annular rib in a direction away from the center point, and the outer circumference of the positioning rib being spaced from the edge of the cover body; The second convex rib is arranged on the cover body and protrudes from the plane where the cover body is located along the first direction. The second convex rib is located on the inner circumference of the first convex rib. The second convex rib is annular and spaced apart from the first convex rib.

2. The cover plate according to claim 1, characterized in that: The area on the cover body located on the outer periphery of the first convex rib forms a matching surface, and a circle on the matching surface located on the outer periphery of the positioning rib forms a welding surface, and the welding surface is suitable for welding to the opening end of the shell.

3. The cover plate according to claim 2, characterized in that: The radial dimension D1 of the welding surface is equal to the wall thickness T of the side wall of the shell; And / or, the height H of the positioning rib has a value range of: 0.5T <H<6mm; And / or, the outer peripheral surface of the positioning rib forms a guide surface, the guide surface is suitable for matching with the inner wall of the shell, and the value range of the angle θ between the guide surface and the welding surface is 90°≤θ<180°.

4. The cover plate according to claim 1, characterized in that: The number of the positioning ribs is at least two, and at least two of the positioning ribs are evenly spaced around the circumference of the annular rib.

5. The cover plate according to claim 1, characterized in that: The circumferential length of the positioning rib is L=2πRα / 180°, wherein R is the radius of the circle on which the outer circumference of the positioning rib is located, and α is the angle between the two sides of the positioning rib along the circumference of the annular rib and the line connecting the center point, and 0°<α<180°.

6. The cover plate according to claim 1, characterized in that: The cover plate further comprises: a liquid injection area, which is arranged at the center of the cover plate body, and the liquid injection area protrudes out of the plane where the cover plate body is located along the first direction, and a liquid injection hole is opened in the liquid injection area.

7. The cover plate according to claim 6, characterized in that: On the cover plate body, a first recessed area is formed between the first convex rib and the second convex rib; and a second recessed area is formed between the second convex rib and the liquid injection area.

8. The cover plate according to claim 1, characterized in that: An explosion-proof notch is provided on a side of the second convex rib away from the first direction, and the explosion-proof notch is provided in at least a partial area of ​​the second convex rib along the circumference of the second convex rib.

9. The cover plate according to claim 8, characterized in that: The area of ​​the cover plate is S, and the area of ​​the region enclosed by the explosion-proof notch is S1, wherein 0.2≤S1 / S≤0.

95.

10. A battery, characterized in that: include: A housing having an open end; A pole group, installed inside the shell; The cover plate according to any one of claims 1 to 9 is arranged at the open end of the shell to close the shell.

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