Top cover sheet, battery and electric equipment

Abstract

The invention provides a top cover piece, a battery and electric equipment, the top cover piece is used for connecting a battery cell and outputting current outwards, the top cover piece comprises a body and a convex hull, the body and the convex hull are integrally formed, the convex hull comprises a connecting wall and a top wall, the connecting wall and the top wall are integrally formed, the top wall is located on one side of the body, the connecting wall is connected between the top wall and the body, and the connecting wall is connected between the connecting wall and the body. The problem that a cylindrical battery is prone to liquid leakage can be solved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to top cover sheets, batteries, and electrical devices. Background Technology

[0002] In related technologies, cylindrical batteries typically use a double-riveted cover plate connected to a double-through aluminum shell. The riveted cover plate contains multiple structural components and is sealed with a fluororubber sealing ring. Under the influence of electrolyte, the fluororubber sealing ring is prone to stress relaxation, resulting in poor sealing performance and posing a risk of battery leakage. Moreover, this method is costly. Summary of the Invention

[0003] Embodiments of this application provide a top cover, a battery, and an electrical device that can improve the problem of battery leakage.

[0004] In a first aspect, embodiments of this application provide a top cover sheet for connecting a battery cell and for outputting current to the outside. The top cover sheet includes a body and a protrusion, which are integrally formed. The protrusion includes a connecting wall and a top wall, which are integrally formed. The top wall is located on one side of the body, and the connecting wall is connected between the top wall and the body.

[0005] In this embodiment, the battery cell can be connected to the top cover plate and output current through the top cover plate. Since the body and the convex shroud are integrally formed, and the connecting wall and the top wall of the convex shroud are integrally formed, the overall sealing performance of the top cover plate is better, which can reduce the risk of leakage. Compared with the cover plate of the riveted structure in the traditional design, the use of plastic, sealing ring and other components is eliminated, and the cost is lower.

[0006] In this embodiment, the top cover plate includes an integrally formed body and a protrusion, which simplifies the manufacturing process, reduces manufacturing costs, and improves production efficiency. Compared to riveted cover plates, the top cover plate in this embodiment is easier to install and saves assembly costs.

[0007] In one embodiment, the body includes a first surface facing away from the top wall and a second surface facing the top wall, the distance between the surface of the top wall facing away from the body and the second surface is H1, the distance between the first surface and the second surface is t, and the relationship between H1 and t is: .

[0008] To ensure the structural strength of the convex hull, the following limits are imposed. If H1 is greater than 3t, the convex hull is prone to deformation or even breakage.

[0009] In one embodiment, the distance t between the first surface and the second surface ranges from 0.8 mm to 2 mm. This results in the top cover sheet having high strength.

[0010] In one embodiment, the convex bulge further includes a first rounded corner and a second rounded corner. The connecting wall is connected to the top wall via the first rounded corner, and the connecting wall is connected to the body via the second rounded corner. This gives the top cover sheet better strength.

[0011] In one embodiment, the minimum distance between the connecting wall and the top wall is R1. Where t is the thickness of the body; and / or The minimum distance between the connecting wall and the first surface of the top wall is R2. Where t is the thickness of the body.

[0012] This design avoids excessively small bending radius, thus preventing stress concentration.

[0013] In one embodiment, the connecting wall and the top wall form an inner cavity, and the angle between the plane containing the inner surface of the connecting wall facing the inner cavity and the plane containing the first surface is α1. .

[0014] This design allows the convex bulge to be formed smoothly and reduces the possibility of sheet metal deformation.

[0015] In one embodiment, the formula for calculating the maximum pressure F borne by the convex hull is:

[0016] Where F is the maximum pressure that the convex hull can withstand; A is the area of ​​the top wall of the convex hull; σ is the tensile strength of the base material; K is the first coefficient; and Y is the second coefficient.

[0017] In this way, when pressure is applied to the convex hull later, it will not exceed the maximum pressure F that the convex hull can withstand, which will make the convex hull less prone to damage.

[0018] In one embodiment, the range of the ratio H8 between the area of ​​the top wall and the area of ​​the top cover sheet is: This design improves the compressive strength of the top wall, making it less prone to damage.

[0019] In one embodiment, the connecting wall is arranged perpendicular to the body.

[0020] Since the thickness of the convex hull sidewall can change due to the plastic deformation of the material, in order to ensure the stability and strength of the convex hull structure, in one embodiment, the ratio of the minimum thickness of the connecting wall to the thickness of the body is greater than or equal to 0.6, thereby ensuring the stability and strength of the structure.

[0021] In one embodiment, along the arrangement direction of the top wall and the body, the relationship between the height R3 of the connecting wall and the thickness t of the body is as follows: This avoids the problems of outward bending and difficulty in controlling verticality caused by excessively small straight edges during bending.

[0022] In one embodiment, the body is formed with stamping features by stamping, and the minimum distance H7 between the stamping features and the outer peripheral surface of the body is related to the thickness t of the body as follows: This design gives the body good strength and makes it less prone to damage.

[0023] Secondly, embodiments of this application provide a battery including the aforementioned top cover and a battery cell, wherein the top cover is electrically connected to the positive output terminal of the battery cell.

[0024] In this embodiment, the battery cell can be connected to the top cover and output current through the top cover. Since the body and the convex shroud are integrally formed, and the connecting wall and the top wall of the convex shroud are integrally formed, the overall sealing performance of the top cover is better. Compared with the cover plate of the riveted structure in the traditional design, the use of plastic, sealing ring and other components is eliminated, which can reduce the risk of battery leakage.

[0025] In one embodiment, the battery further includes a riveted cover assembly, which is electrically connected to the negative output terminal of the battery cell.

[0026] Compared to related technologies that use a double-riveted cover plate connected to a double-through aluminum shell for cylindrical batteries (i.e., a riveted cover plate is used on both the positive and negative electrodes), the embodiment of this application uses a more integrated top cover plate on the positive electrode, which reduces the risk of leakage during the battery warranty period. It also saves assembly costs, simplifies the structure, and reduces procurement costs.

[0027] Thirdly, embodiments of this application provide an electrical device, including a top cover as described above or a battery as described above.

[0028] This design reduces the risk of battery leakage and extends the lifespan of electrical equipment. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a three-dimensional schematic diagram of the battery cover provided in related technologies; Figure 2Figure (a) is a cross-sectional view of one embodiment of the top cover provided in this application. Figure 2 Figure (b) is Figure 2 A magnified view of point P in Figure (a); Figure 3 This is a perspective view of one embodiment of the top cover sheet provided in the embodiments of this application; Figure 4 yes Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a schematic diagram of another embodiment of the top cover sheet provided in the embodiments of this application; Figure 6 This is a schematic diagram of the battery structure provided in an embodiment of this application; Figure 7 This is a block diagram of the electrical equipment provided in the embodiments of this application. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0032] In related technologies, cylindrical batteries typically use a double-riveted cover plate connected to a double-through aluminum shell. The riveted cover plate contains multiple structural components and is sealed with a fluororubber sealing ring. Under the influence of electrolyte, the fluororubber sealing ring is prone to stress relaxation, resulting in poor sealing performance and posing a risk of battery leakage. Moreover, this method is costly.

[0033] Specifically, please refer to Figure 1The battery cover assembly typically includes a cover plate 1', a terminal post 2', a rivet block 3', an upper plastic 4', and a lower plastic 5'. The terminal post 2' includes a body 201' and an electrode plate 202' disposed at one end of the body 201'. The lower plastic 5' has a first through hole, the cover plate 1' has a second through hole, and the upper plastic 4' has a third through hole. During assembly, the lower plastic 5', the cover plate 1', the upper plastic 4', and the rivet block 3' are stacked sequentially, so that the first through hole, the second through hole, and the third through hole are connected to form a mounting hole. Then, the end of the body 201' of the terminal post 2' away from the electrode plate 202' is passed through the mounting hole and riveted to the rivet block 3'. At the same time, the electrode plate 202' abuts against the lower plastic 5', thereby fixing the terminal post 2' onto the cover plate 1' and pressing the upper plastic 4' and the lower plastic 5' against the cover plate 1'. The lower plastic 5' seals the electrode plate 202' and the cover plate 1'. The riveted cover plate has a complex structure, high assembly costs, and during use, the lower plastic 5' is prone to stress relaxation under electrolyte conditions, leading to a reduced seal life and even a risk of leakage during the battery warranty period.

[0034] Please combine Figure 2 Figure (a) in the middle Figure 2 Figure (b) and Figure 6 This application provides a top cover plate 1 for connecting a battery cell 21 and for outputting current. The top cover plate 1 includes a body 10 and a protrusion 30, which are integrally formed. The protrusion 30 includes a connecting wall 31 and a top wall 33, which are integrally formed. The top wall 33 is located on one side of the body 10, and the connecting wall 31 is connected between the top wall 33 and the body 10.

[0035] In this embodiment, the battery cell 21 can be connected to the top cover plate 1 and output current to the outside through the top cover plate 1. Since the body 10 and the protrusion 30 are integrally formed, and the connecting wall 31 and the top wall 33 of the protrusion 30 are integrally formed, the overall sealing performance of the top cover plate 1 is better. Compared with the cover plate of the riveted structure in the traditional design, the use of plastic, sealing ring and other components is eliminated, which can reduce the risk of leakage.

[0036] In this embodiment, the top cover 1 includes an integrally formed body 10 and a protrusion 30, which simplifies the manufacturing process, reduces manufacturing costs, and improves production efficiency. Compared to riveted cover plates, the top cover 1 in this embodiment is easier to install and saves assembly costs.

[0037] The main body 10 can be used to connect to the positive current collector.

[0038] In this embodiment, the top cover 1 is the top cover 1 of the battery. After the battery is assembled, multiple batteries are connected in series or parallel via a busbar bracket. Specifically, the protrusion 30 can be installed at the opening position of the busbar bracket. In this way, by setting the protrusion 30 structure, it is convenient to connect multiple batteries through the busbar bracket.

[0039] In some embodiments, the body 10 includes a first surface 13 facing away from the top wall 33 and a second surface 11 facing the top wall 33. The distance H1 between the surface of the top wall 33 facing away from the body 10 and the second surface 11 is equal to the thickness t of the body 10. The relationship between H1 and t is as follows: .

[0040] To ensure the structural strength of the convex hull 30, the following limits are imposed. If H1 is greater than 3t, the convex hull 30 is prone to deformation or even breakage.

[0041] In some embodiments, the top cover 1 can be integrally formed by stamping. A metal sheet can be used to stamp out an integrally formed body 10 and a protrusion 30 to facilitate the formation of the top cover 1. The distance t between the first surface 13 and the second surface 11 can be considered as the thickness of the metal sheet or the thickness of the body 10. The distance H1 between the top wall 33 and the second surface 11 can be considered as the height of the protrusion 30.

[0042] In some examples, the distance t between the first surface 13 and the second surface 11 ranges from 0.8 mm to 2 mm. This gives the top cover plate 1 high strength. Specifically, the distance t between the first surface 13 and the second surface 11 can be 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2 mm.

[0043] In some implementations, the formula for calculating the maximum pressure F borne by the convex hull 30 is:

[0044] Where F is the maximum pressure borne by the convex hull, in N; A is the area of ​​the top wall of the convex hull, specifically the area of ​​the top wall of the convex hull away from the surface of the body 10, in units of N. σ is the tensile strength of the base material, in units of... The tensile strength of the base material is determined by its material composition; K is the first coefficient, which is related to the tensile length of the convex hull; Y is the second coefficient, and in some examples, the value of the second coefficient Y can be 0.7~0.8, for example, the value of the second coefficient Y can be 0.7 or 0.8.

[0045] It is easy to understand that in the production and processing process, the first step is to select the base material. Once the material of the base material is determined, its tensile strength is also determined. Processing the base material, such as stretching it to create a protrusion, affects its tensile strength. Furthermore, the impact on the tensile strength of the base material varies depending on the height or length of the protrusion. In this embodiment, a first coefficient K is used to measure the magnitude of the impact of stretching the base material to create a protrusion on its tensile strength. In actual production, the initial sheet material is taken. Since the initial sheet material has not undergone stretching or extrusion, its material properties can be considered consistent with the base material, and it can be considered to have the same tensile strength. However, after secondary forming, such as extrusion by a punch press, the fluidity of the material inside the sheet material changes, leading to a certain proportion of loss in the tensile strength. In other words, stretching a protrusion onto the initial sheet material alters its mechanical strength compared to the initial sheet material. The first coefficient K can also be understood as a proportionality coefficient after the deformation hardening of the convex hull. The first coefficient K is related to the degree of stretching of the convex hull. The product of the tensile strength σ of the base material and the first coefficient K can be used to represent the tensile strength of the convex hull after it has been machined from the base material. The first coefficient K is less than or equal to 1.

[0046] The second coefficient Y can be related to the punching force of the punch press. For example, the greater the punching force, the larger the second coefficient Y. It is easy to understand that the punching force of the punch press will affect the structural density of the convex bulge, thereby affecting the maximum pressure F that the convex bulge can withstand. The second coefficient Y is less than or equal to 1.

[0047] The punching force of a punch press can be related to some parameters of the punch press during the punching process. For example, the second coefficient Y can be related to the tonnage of the punch press and the punching speed during the punching process.

[0048] In some embodiments, during the stamping process, the punch presses may have different tonnages; for example, a 200-ton punch press may be used to stamp the top cover plate. During the forming of the convex shape, a momentary compression of the base material is required using a punch press. Using punch presses with different tonnages to compress the base material will have different effects on its strength. In some examples, the tonnage of the punch press is positively correlated with a second coefficient Y; the larger the tonnage of the punch press, the larger the second coefficient Y, resulting in a higher density of the structure formed by compression (e.g., the convex shape), thus increasing its strength and the maximum pressure the convex shape can withstand.

[0049] In some examples, the stamping speed of the punch during the stamping process is positively correlated with the second coefficient Y. The higher the stamping speed, the larger the second coefficient Y, which means that the density of the structure (such as the bulge) produced by extrusion is greater, resulting in greater strength and thus increasing the maximum pressure that the bulge can withstand.

[0050] In a specific example, the base material can be an aluminum alloy, specifically AL3003H14, with a tensile strength σ of 150 MPa and an area A of the top wall of the convex hull of 30. With the first coefficient K being 0.8 and the second coefficient Y being 0.7, F = 2520 N. This means the maximum pressure this convex hull can withstand is 2520 N. Therefore, when applying pressure to the convex hull subsequently, it must not exceed the maximum pressure F that the convex hull 30 can withstand, thus preventing damage to the convex hull 30.

[0051] Since the thickness of the convex hull sidewalls can change due to the plastic deformation of the material, in order to ensure the stability and strength of the convex hull structure, in some embodiments, please refer to... Figure 1 The ratio of the minimum thickness H2 of the connecting wall 31 to the thickness t of the body 10 is greater than or equal to 0.6, i.e., H2 ≥ 0.6t. For example, the ratio of the minimum thickness H2 of the connecting wall 31 to the thickness t of the body 10 can be 0.6, 0.7, 0.8, 0.9, etc., thereby ensuring the stability and strength of the structure.

[0052] In some embodiments, the connecting wall 31 and the top wall 33 form the inner cavity 32. Specifically, the connecting wall 31, the top wall 33, and the inner cavity 32 can be integrally formed by stamping a metal sheet. Please refer to... Figure 2 Figure (a) and Figure 2 As shown in Figure (b), the angle between the plane containing the surface of the connecting wall 31 facing the inner cavity 32 (i.e., the inner surface 311) and the plane containing the first surface 13 is a1, where a1 ≥ 15°. For example, a1 can be 15°, 25°, 35°, 45°, 55°, 65°, 75°, 85°, or 90°. The angle a1 between the plane containing the inner surface 311 of the connecting wall 31 facing the inner cavity 32 and the plane containing the first surface 13 can be used to measure the slope of the convex hull. If a1 ≥ 15°, that is, the slope of the convex hull is not less than 15°, this setting can make the convex hull form smoothly and reduce the possibility of sheet metal deformation.

[0053] In some embodiments, the connecting wall 31 is arranged perpendicularly to the body 10. This arrangement facilitates subsequent connection with the busbar support.

[0054] In some examples, the connecting wall 31 is arranged perpendicular to the body 10, and the angle α1 between the plane of the inner surface 311 of the connecting wall 31 facing the inner cavity 32 and the plane of the first surface 13 can be 90°.

[0055] The convex bulge 30 also includes a first rounded corner 35 and a second rounded corner 37. The connecting wall 31 is connected to the top wall 33 through the first rounded corner 35, and the connecting wall 31 is connected to the body 10 through the second rounded corner 37, thereby giving the top cover sheet better strength. In some examples, the connecting wall 31 may be connected to the inner surface of the top wall 33 (the surface of the top wall 33 facing the battery cell) through the first rounded corner 35, and the connecting wall 31 may be connected to the first surface 13 through the second rounded corner 37.

[0056] In some embodiments, the minimum distance between the connecting wall 31 and the top wall 33 is R1, where R1 ≥ 0.5t, and t is the thickness of the body 10.

[0057] It should be noted that the convex hull 30 includes a second rounded corner 37, a connecting wall 31, a first rounded corner 35, and a top wall 33. The connecting wall 31 and the top wall 33 are connected by the first rounded corner 35, and the connecting wall 31 is connected to the body 10 by the second rounded corner 37. Please refer to... Figure 3 , Figure 4 The example is illustrated using the inner surfaces of the connecting wall 31 and the top wall 33. R1 is the minimum distance between the plane containing the side of the connecting wall 31 facing the top wall 33 and the surface of the top wall 33 facing the connecting wall 31 (also referred to as the inner surface 331 of the top wall) in the arrangement direction of the top wall 33 and the body 10 (or along the axial direction of the battery). In some examples, it can also be the straight-line distance between the two closest points between the connecting wall 31 and the top wall 33.

[0058] In some embodiments, the minimum distance between the connecting wall 31 and the first surface 13 is R2, where R2 ≥ 0.5t, and t is the thickness of the body 10. (Please refer to...) Figure 4 For example, the inner surfaces of the connecting wall 31 and the top wall 33 are used for illustration. R2 is the minimum distance between the plane on the side of the connecting wall 31 facing the first surface 13 and the first surface 13. In some examples, it may also be the straight-line distance between the two closest points between the connecting wall 31 and the first surface 13.

[0059] In some embodiments, the minimum distance between the connecting wall 31 and the top wall 33 is R1, where R1 ≥ 0.5t; and the minimum distance between the connecting wall 31 and the first surface 13 is R2, where R2 ≥ 0.5t, and t is the thickness of the body 10.

[0060] In some embodiments, the top cover 1 is integrally formed by stamping, and can be made of a metal sheet, with the body 10 and the protrusion 30 stamped out to facilitate the formation of the top cover 1. The distance t between the first surface 13 and the second surface 11 can be considered as the thickness of the metal sheet or the thickness of the body 10. To avoid stress concentration, the minimum distance R1 between the connecting wall 31 and the top wall 33, the minimum distance R2 between the connecting wall 31 and the first surface 13, and the thickness t of the body 10 are limited. This prevents stress concentration caused by excessively small first fillet 35 and second fillet 37 formed by stamping. In this embodiment, the bending radius (R-angle) of the convex bulge is R1≥0.5t and R2≥0.5t, where t is the thickness of the substrate, and the value of t can range from 0.8mm to 2mm. This setting can avoid stress concentration caused by the stamping of the first radius 35 and the second radius 37 being too small.

[0061] Along the arrangement direction of the top wall 33 and the body 10, the relationship between the height R3 of the connecting wall 31 and the thickness t of the body 10 is: R3 ≥ t. In related technologies, a small bending straight edge can easily cause the convex hull to tilt outwards, making it difficult to control perpendicularity. In this embodiment, the connecting wall 31 and the body 10 can be vertically aligned, and the height R3 of the connecting wall 31 is limited to R3 ≥ t, thereby avoiding the problems of tilting outwards and difficulty in controlling perpendicularity caused by a small bending straight edge. It is easily understood that if the height R3 of the connecting wall 31 is small, during the demolding process after stamping the convex hull, the contact area between the convex hull and the mold is relatively small. During the removal of the mold, the mold will exert a large force on the connecting wall 31 of the convex hull, easily causing deformation of the connecting wall 31.

[0062] In some examples, the height R3 of the connecting wall 31 can be the height of the inner surface 311 of the connecting wall 31.

[0063] In some examples, the main body 10 is arranged parallel to the top wall 33, and the connecting wall 31 is arranged perpendicular to the main body 10 and the top wall 33. In this case, the height R3 of the connecting wall 31 can be the distance between the two ends of the connecting wall 31 (i.e., the end face of the connecting wall 31 near the top wall and the end face of the connecting wall 31 near the main body 10).

[0064] In some examples, the body 10 is arranged parallel to the top wall 33, and the connecting wall 31 is not arranged perpendicular to the body 10. In this case, the height R3 of the connecting wall 31 can be: the minimum distance between the two ends of the connecting wall 31 (i.e., the end face of the connecting wall 31 near the top wall and the end face of the connecting wall 31 near the body 10) in the arrangement direction of the top wall 33 and the body 10.

[0065] The ratio H8 of the area of ​​the top wall 33 to the area of ​​the top cover 1 is ≥ 0.1. For example, the ratio H8 of the area of ​​the top wall 33 to the area of ​​the top cover 1 can be 0.1, 0.2, 0.3, 0.4, 0.5, or 0.6.

[0066] In some examples, the area of ​​the top wall 33 can specifically be the area of ​​the surface of the top wall 33 facing away from the body 10, or it can be the area of ​​the projection of the top wall 33 onto the horizontal plane. Please refer to... Figure 5 , Figure 5 The area of ​​the projection of the top wall 33 onto the horizontal plane is roughly indicated by shading. The area of ​​the top cover plate 1 can be the area of ​​the projection of the top cover plate 1 onto the horizontal plane. In some examples, the area of ​​the top cover plate 1 can be the entire area of ​​the circle containing the projection of the outer contour of the top cover plate 1. This setting can improve the compressive strength of the top wall 33, making the top wall 33 less prone to damage.

[0067] The body 10 is formed with a first feature by stamping. The minimum distance H7 between the first feature and the outer peripheral surface of the body 10 is related to the thickness t of the body 10 as follows: H7≥2t.

[0068] The first feature can refer to the structure formed by stamping of the body 10. In one example, the first feature can refer to the explosion-proof valve 153 and the injection port 151. It is easy to understand that the body 10 has the explosion-proof valve 153 and the injection port 151 structure formed by stamping. The minimum distance between the explosion-proof valve 153, the injection port 151 and the outer peripheral surface 17 of the body is H7. Please refer to... Figure 5 , Figure 5 The injection hole 151 in the body has a minimum distance H7 between it and the outer peripheral surface 17 of the body. The relationship between H7 and the thickness t of the body 10 is: H7 ≥ 2t. This design allows the body 10 to have good strength and is not easily damaged.

[0069] Please combine Figure 6 Secondly, a battery 2 is provided, including the aforementioned top cover 1 and a battery cell 21, wherein the top cover 1 is electrically connected to the positive output terminal of the battery cell 21.

[0070] The battery 2 may further include a riveted cover assembly 23, which is electrically connected to the negative output terminal of the battery cell 21. The battery 2 may include a housing, a positive electrode busbar, and a negative electrode busbar. The housing has a receiving cavity and a positive electrode opening and a negative electrode opening communicating with the receiving cavity. The receiving cavity is used to receive the battery cell. The battery cell has a positive electrode tab and a negative electrode tab at opposite ends, with the positive electrode tab located near the positive electrode opening and the negative electrode tab located near the negative electrode opening. The aforementioned top cover 1 is installed on the housing and covers the positive electrode opening. The riveted cover assembly 23 is installed on the housing and covers the negative electrode opening. Further, the positive electrode busbar is installed in the receiving cavity and is connected to both the positive electrode tab and the top cover 1. The negative electrode busbar is installed in the receiving cavity and is connected to both the negative electrode tab and the riveted cover assembly 23.

[0071] The negative terminal of battery 2 may be equipped with a riveted cover assembly 23. The negative output terminal of cell 21 can be connected to the negative terminal tab of cell 21 and the negative terminal busbar, which is connected to the riveted cover assembly 23, thereby enabling the negative terminal to output a negative charge. For the riveted cover assembly 23, the terminals are insulated from the battery casing, making it less likely for the battery casing to carry a negative charge. It is easy to understand that if the battery casing carries a negative charge, it will easily corrode, leading to a shortened battery life. On the positive terminal of battery 2, the aforementioned integrated top cover 1 is used. The top cover 1 is connected to the casing, and the casing carries a positive charge, making it less likely for the battery casing to corrode. In some examples, cell 21 can specifically be the core of a cylindrical battery, and battery 2 can specifically be a cylindrical battery.

[0072] Compared to related technologies where cylindrical batteries use a double-riveted cover plate connected to a double-through aluminum shell (i.e., a riveted cover plate is used on both the positive and negative electrodes), this application's embodiment uses a more integrated top cover plate 1 on the positive electrode, which reduces the risk of leakage during the battery warranty period. It also saves assembly costs, simplifies the structure, and reduces procurement costs.

[0073] Please combine Figure 7 Thirdly, an electrical device 3 is provided, including the aforementioned top cover 1 or the aforementioned battery 2. This arrangement reduces the risk of battery leakage and increases the service life of the electrical device.

[0074] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A top cover sheet, characterized in that, For connecting the battery cell (21) and for outputting current, the top cover (1) includes a body (10) and a protrusion (30), the body (10) and the protrusion (30) are integrally formed, the protrusion (30) includes a connecting wall (31) and a top wall (33), the connecting wall (31) and the top wall (33) are integrally formed, the top wall (33) is located on one side of the body (10), and the connecting wall (31) is connected between the top wall (33) and the body (10).

2. The top cover sheet according to claim 1, characterized in that, The body (10) includes a first surface (13) facing away from the top wall (33) and a second surface (11) facing the top wall (33). The distance H1 between the surface of the top wall (33) facing away from the body (10) and the second surface (11) is the thickness t of the body (10). The relationship between H1 and t is: .

3. The top cover sheet according to claim 2, characterized in that, The distance t between the first surface (13) and the second surface (11) ranges from 0.8 mm to 2 mm.

4. The top cover sheet according to claim 1, characterized in that, The convex hull (30) also includes a first rounded corner (35) and a second rounded corner (37). The connecting wall (31) is connected to the top wall (33) through the first rounded corner (35), and the connecting wall (31) is connected to the body (10) through the second rounded corner (37).

5. The top cover sheet according to claim 1, characterized in that, The minimum distance between the connecting wall (31) and the top wall (33) is R1. Where t is the thickness of the body (10); and / or The minimum distance between the connecting wall (31) and the first surface (13) of the top wall (33) is R2. , where t is the thickness of the body (10).

6. The top cover sheet according to claim 2, characterized in that, The connecting wall (31) and the top wall (33) form an inner cavity (32). The angle between the plane containing the inner surface (311) of the connecting wall (31) facing the inner cavity (32) and the plane containing the first surface (13) is α1. .

7. The top cover sheet according to claim 1, characterized in that, The formula for calculating the maximum pressure F borne by the convex hull (30) is as follows: Where F is the maximum pressure that the convex hull can withstand; A is the area of ​​the top wall of the convex hull; σ is the tensile strength of the base material; K is the first coefficient; and Y is the second coefficient.

8. The top cover sheet according to claim 1, characterized in that, The range of the ratio H8 between the area of ​​the top wall (33) and the area of ​​the top cover plate (1) is as follows: .

9. The top cover sheet according to claim 1, characterized in that, The connecting wall (31) is perpendicular to the body (10).

10. The top cover sheet according to claim 1, characterized in that, The ratio of the minimum thickness of the connecting wall (31) to the thickness of the body is greater than or equal to 0.

6.

11. The top cover sheet according to claim 1, characterized in that, Along the arrangement direction of the top wall (33) and the body (10), the relationship between the height R3 of the connecting wall (31) and the thickness t of the body (10) is as follows: .

12. The top cover sheet according to claim 1, characterized in that, The body (10) is formed with a stamping feature (15) by stamping. The minimum distance H7 between the stamping feature (15) and the outer peripheral surface (17) of the body is related to the thickness t of the body (10) as follows: .

13. A battery (2), characterized in that, Includes a top cover plate (1) as described in any one of claims 1-12 and a battery cell (21), wherein the top cover plate (1) is electrically connected to the positive output terminal of the battery cell.

14. The battery according to claim 13, characterized in that, The battery (2) also includes a riveted cover plate assembly (23), which is electrically connected to the negative output terminal of the battery cell.

15. An electrical appliance (3), characterized in that, Includes the top cover sheet (1) as described in any one of claims 1-12 or the battery (2) as described in any one of claims 13-14.

Images