Top cover, battery cover cap and battery

Abstract

The invention provides a top cover, a battery cover cap and a battery, the top cover comprises a first cover body, a second cover body and a plurality of connecting parts, the first cover body and the second cover body are arranged at intervals, the connecting parts are arranged between the first cover body and the second cover body, the first ends of the connecting parts are connected with the first cover body, and the second ends of the connecting parts are connected with the second cover body; the plurality of connecting parts are arranged at intervals in the circumferential direction of the second cover body; the reinforcing structure is arranged on the connecting part, and the reinforcing structure is arranged on the surface of the connecting part in a protruding mode. According to the technical scheme, the technical problem that the strength of the top cover is low can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of top covers, and in particular to a top cover, a battery cap and a battery. Background Art

[0002] In the related art, the cap assembly of a cylindrical lithium-ion secondary battery generally includes a top cover and other structures. In order to reduce the resistance of the cap, the base material of the top cover is usually replaced from cold-rolled steel to pure copper. However, since the strength of pure copper is lower than that of cold-rolled steel, this will cause the strength of the top cover to decrease, which is not conducive to the normal use of the top cover. Summary of the invention

[0003] The embodiments of the present invention provide a top cover, a battery cap and a battery, which can improve the technical problem of low strength of the top cover.

[0004] In the first aspect, an embodiment of the present invention provides a top cover, which includes: a first cover body, a second cover body, which is spaced apart from the first cover body, a plurality of connecting parts, which are arranged between the first cover body and the second cover body, wherein the first end of the connecting part is connected to the first cover body, the second end of the connecting part is connected to the second cover body, and the plurality of connecting parts are arranged at intervals along the circumference of the second cover body; and a reinforcing structure, which is arranged on the connecting part, and the reinforcing structure protrudes from the surface of the connecting part.

[0005] In one embodiment, the extending length of the connecting portion in the radial direction of the first cover body is L1, the extending length of the reinforcing structure in the radial direction of the first cover body is L2, and L1-L2>1 mm.

[0006] In one embodiment, 2.6 mm ≤ L1 ≤ 8.4 mm, and 1.5 mm ≤ L2 ≤ 7.4 mm.

[0007] In one embodiment, the extension length of the reinforcement structure in the axial direction of the first cover body is L3, 1mm≤L3≤1.9mm.

[0008] In one embodiment, the thickness of the reinforcement structure is L4, 0.25 mm≤L4≤0.5 mm.

[0009] In one embodiment, the reinforcement structure includes a diameter-changing section, and an extension length of the diameter-changing section in the radial direction of the first cover body gradually increases from the second cover body toward the first cover body.

[0010] In one embodiment, the axis of the first cover body and the axis of the second cover body are parallel to each other.

[0011] In one embodiment, the axis of the first cover coincides with the axis of the second cover.

[0012] In a second aspect, an embodiment of the present invention provides a battery cap, the battery cap comprising the above-mentioned top cover.

[0013] In a third aspect, an embodiment of the present invention provides a battery, the battery comprising the above-mentioned battery cap.

[0014] By applying the technical solution of the present invention, since the base material of the top cover is changed from cold-rolled steel to pure copper, which will cause the strength of the top cover to decrease, a reinforcing structure is provided on the connecting portion between the first cover body and the second cover body. This can increase the structural strength of the connecting portion, thereby increasing the range of options for the base material of the top cover, facilitating subsequent research and development, and also extending the service life of the connecting portion, thereby facilitating the normal use of the top cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a three-dimensional schematic diagram of a top cover provided by an embodiment of the present invention;

[0017] Figure 2 is a schematic top view of a top cover provided by an embodiment of the present invention;

[0018] Figure 3 is a side schematic diagram of a top cover provided by an embodiment of the present invention;

[0019] Figure 4 It is a side schematic diagram of the top cover provided by the embodiment of the present invention from another viewing angle.

[0020] The above drawings include the following reference numerals:

[0021] 1. Top cover;

[0022] 11. First cover body; 12. Second cover body; 13. Connecting part; 14. Reinforcement structure. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] like Figures 1 to 4As shown, in the first aspect, an embodiment of the present invention provides a top cover 1, which includes: a first cover body 11, a second cover body 12, which is spaced apart from the first cover body 11, a plurality of connecting parts 13, which are arranged between the first cover body 11 and the second cover body 12, a first end of the connecting part 13 is connected to the first cover body 11, a second end of the connecting part 13 is connected to the second cover body 12, and the plurality of connecting parts 13 are arranged at intervals along the circumference of the second cover body 12; a reinforcing structure 14, which is arranged on the connecting part 13, and the reinforcing structure 14 protrudes from the surface of the connecting part 13.

[0025] By applying the technical solution of the present invention, a reinforcing structure 14 is provided on the connecting portion 13 between the first cover body 11 and the second cover body 12, so that the structural strength of the connecting portion 13 can be increased, thereby increasing the range of optional base materials for the top cover 1, facilitating subsequent research and development, and also extending the service life of the connecting portion 13, thereby facilitating the normal use of the top cover 1.

[0026] The main material types of the top cover 1 are metal materials, high-strength aluminum alloys or steel. In some special applications or occasions where higher strength requirements are required, steel is also used as the material of the top cover 1. Composite materials such as SCM (sheet mold material) and LFT-D (long fiber reinforced thermoplastic material) can also be used. As long as it can meet the use requirements of the device, there is no specific limitation here.

[0027] When the top cover 1 is made of aluminum alloy material, since the density of aluminum alloy is relatively small, the top cover 1 made of aluminum alloy can significantly reduce the weight of the battery. Lightweighting not only helps to improve the energy density of the battery, but also indirectly reduces the overall mass of the battery pack, which is beneficial to the handling of the battery pack. At the same time, aluminum alloy has good formability and is easy to process into various shapes and sizes. This makes aluminum alloy one of the ideal materials for the top cover 1, which can meet the design requirements of different shapes and sizes. Aluminum alloy materials have high strength and rigidity, which can meet the strength and rigidity requirements of the top cover 1. This helps to ensure that the battery can maintain structural integrity when it is hit or squeezed by the outside world, thereby protecting the safety of the battery cells inside the battery. At the same time, aluminum alloy materials have good corrosion resistance and can maintain the stability of their performance under harsh environmental conditions. This is especially important for the top cover 1, because the battery is usually installed at the bottom of the vehicle and is easily eroded by sewage, mud and other materials splashed from the road.

[0028] Furthermore, the aluminum alloy material has good heat transfer and electrical conductivity, which helps to dissipate heat and transfer current inside the battery. Good heat transfer can reduce the temperature inside the battery and improve the working efficiency and service life of the battery. At the same time, good electrical conductivity also helps to ensure the normal operation of the battery. Compared with other materials, the cost of aluminum alloy materials is relatively low, which makes the top cover 1 made of aluminum alloy have cost advantages. At the same time, the recyclability of aluminum alloy materials is also high, which helps to reduce the production cost and environmental pollution of the battery.

[0029] Of course, the top cover 1 can also be made of pure copper material. Since pure copper is used as an electrode material, it has excellent electrical conductivity. It has high electron mobility and better electrical conductivity than aluminum, which can effectively ensure the current transmission efficiency between the top cover 1 and the battery cell inside the battery. This is crucial to the performance and safety of the battery, and can ensure that the battery can work normally under various working conditions. At the same time, pure copper easily forms a dense copper oxide protective layer in the air, which can effectively prevent further corrosion of pure copper. Therefore, the pure copper top cover 1 has good corrosion resistance and can maintain its performance stability under harsh environmental conditions. This is of great significance for extending the service life of the battery and improving the reliability of the battery. Furthermore, pure copper has good ductility and plasticity, and is easy to process into various shapes and sizes. This makes pure copper one of the ideal materials for the top cover 1, which can meet the design requirements of different battery packs. At the same time, the soft properties of pure copper also make it easier to connect and fix it with other components during the manufacturing process of the top cover 1.

[0030] Furthermore, pure copper material also has good thermal conductivity, which helps to dissipate heat inside the battery pack. During the battery charging and discharging process, a certain amount of heat will be generated. If the heat cannot be dissipated in time, it will affect the performance and service life of the battery. The pure copper top cover 1 can effectively transfer heat to the surrounding environment, thereby maintaining a stable temperature inside the battery pack. At the same time, the recyclability of pure copper material is also high, which helps to reduce environmental pollution and save resources.

[0031] In summary, the top cover 1 is made of pure copper, which has the advantages of excellent electrical conductivity, good corrosion resistance, good ductility and plasticity, good thermal conductivity and relatively low cost. These advantages make pure copper one of the preferred materials for the top cover 1, especially in situations where high electrical conductivity, good corrosion resistance and cost control are required. Therefore, in this application, the material of the top cover 1 can be made of pure copper.

[0032] In one embodiment, the connecting portion 13 has an extension length L1 in the radial direction of the first cover body 11, and the reinforcing structure 14 has an extension length L2 in the radial direction of the first cover body 11, and L1-L2>1mm. When L1 is greater than L2 and the difference is greater than 1mm, the connecting portion 13 has a longer extension length relative to the reinforcing structure 14. This helps to increase the contact area and connection strength between the connecting portion 13 and the surrounding structure, thereby improving the structural stability and durability of the entire top cover 1. At the same time, when the top cover 1 is subjected to external force, the longer connecting portion 13 can better disperse and withstand stress, reducing the risk of structural damage caused by stress concentration.

[0033] In the present application, L1 is the straight-line distance between the endpoints of the two ends of the connecting portion 13 in the figure, and L2 is the distance between the projections of the reinforcing structure 14 in the same horizontal plane in the figure.

[0034] Furthermore, in the event that the internal pressure of the battery increases abnormally, the longer connection portion 13 can provide additional support and cushioning, helping to prevent the top cover 1 from rupturing or exploding due to excessive pressure. By rationally designing the extension length of the connection portion 13 and the reinforcement structure 14, the heat dissipation performance of the top cover 1 can be optimized. A longer connection portion 13 helps to increase the heat dissipation area and improve the heat dissipation efficiency, thereby reducing the battery temperature and extending the battery life. By adjusting the difference between L1 and L2, the performance requirements of the top cover 1 in different application scenarios can be flexibly adapted. For example, in situations where higher structural strength and stability are required, the extension length of L1 can be increased; and in situations where better heat dissipation performance is required, the shape and size of the connection portion 13 can be optimized.

[0035] In one embodiment, 2.6 mm ≤ L1 ≤ 8.4 mm, 1.5 mm ≤ L2 ≤ 7.4 mm. Specifically, L1 can be set to values ​​such as 2.6 mm, 5 mm or 8.4 mm, and L2 can be set to values ​​such as 1.5 mm, 5 mm or 7.4 mm. Of course, L1 and L2 can also be set to other values ​​as long as they can meet the use requirements of the device.

[0036] In one embodiment, the extension length L3 of the reinforcing structure 14 in the axial direction of the first cover body 11 is 1mm≤L3≤1.9mm. The extension length L3 of the reinforcing structure 14 in the axial direction of the first cover body 11 is controlled within the range of 1mm to 1.9mm, which can more effectively disperse the stress on the top cover 1 and prevent structural damage caused by stress concentration. This design helps to improve the overall structural strength and stability of the top cover 1. At the same time, by precisely controlling the value of L3, it is possible to ensure that the reinforcing structure 14 is closely matched with the surrounding structure, reducing the decrease in durability caused by looseness or deformation. Furthermore, under the premise of ensuring structural strength, by reasonably designing the value of L3, the size and shape of the reinforcing structure 14 can be optimized, thereby reducing the overall weight of the top cover 1. This helps to improve the energy density and endurance of the battery pack.

[0037] Furthermore, by precisely controlling the value of L3, it is easier to achieve precise processing and manufacturing of the reinforcing structure 14. This helps to reduce production costs and improve production efficiency. A reasonable L3 value can provide more space and flexibility for the assembly process, making the assembly of the top cover 1 with other components easier and more efficient. Improve explosion-proof capability: The reasonable extension of the reinforcing structure 14 in the axial direction can enhance the pressure resistance of the top cover 1, thereby providing better protection when the internal pressure of the battery rises abnormally. This design helps prevent the top cover 1 from rupturing or exploding due to excessive pressure. By reasonably designing the value of L3, the heat dissipation structure of the top cover 1 can be optimized and the heat dissipation efficiency can be improved. This helps to reduce the battery temperature and extend the battery life.

[0038] At the same time, by adjusting the value of L3, the performance requirements of the top cover 1 in different application scenarios can be flexibly adapted. For example, in situations where higher structural strength is required, the value of L3 can be increased; and in situations where better heat dissipation performance is required, the shape and size of the reinforcement structure 14 can be optimized. L3 can be set to values ​​such as 1mm, 1.5mm, or 1.9mm.

[0039] In one embodiment, the thickness of the reinforcing structure 14 is L4, 0.25mm≤L4≤0.5mm. The thickness of the reinforcing structure 14 L4 is controlled within the range of 0.25mm to 0.5mm, which can more effectively disperse the stress on the top cover 1 and prevent structural damage caused by stress concentration. This design helps to improve the overall structural strength and stability of the top cover 1. At the same time, by precisely controlling the value of L4, it is possible to ensure that the reinforcing structure 14 is closely matched with the surrounding structure, reducing the decrease in durability caused by looseness or deformation. Furthermore, under the premise of ensuring structural strength, by reasonably designing the value of L4, the size and shape of the reinforcing structure 14 can be optimized, thereby reducing the overall weight of the top cover 1. This helps to improve the energy density and endurance of the battery pack.

[0040] Furthermore, by precisely controlling the value of L4, it is easier to achieve precise processing and manufacturing of the reinforcing structure 14. This helps to reduce production costs and improve production efficiency. A reasonable L4 value can provide more space and flexibility for the assembly process, making the assembly of the top cover 1 with other components easier and more efficient. Improve explosion-proof capability: The reasonable extension of the reinforcing structure 14 in the axial direction can enhance the pressure resistance of the top cover 1, thereby providing better protection when the internal pressure of the battery rises abnormally. This design helps prevent the top cover 1 from rupturing or exploding due to excessive pressure. By reasonably designing the value of L4, the heat dissipation structure of the top cover 1 can be optimized and the heat dissipation efficiency can be improved. This helps to reduce the battery temperature and extend the battery life.

[0041] At the same time, by adjusting the value of L4, the performance requirements of the top cover 1 in different application scenarios can be flexibly adapted. For example, in situations where higher structural strength is required, the value of L4 can be increased; and in situations where better heat dissipation performance is required, the shape and size of the reinforcement structure 14 can be optimized. L4 can be set to values ​​such as 0.25mm, 0.4mm, or 0.5mm.

[0042] In one embodiment, the reinforcing structure 14 includes a variable diameter section, and the extension length of the variable diameter section in the radial direction of the first cover body 11 gradually increases from the second cover body 12 toward the first cover body 11. The design of the variable diameter section can adjust the size and shape of the structure according to actual needs, so as to enhance the bearing capacity of the structure. In areas with greater stress, by increasing the size of the variable diameter section or changing its shape, the external force can be effectively dispersed and resisted, thereby improving the overall strength and stability of the structure. At the same time, the variable diameter section can guide the distribution of stress in the structure to avoid the occurrence of stress concentration. Through a reasonable variable diameter design, the stress can be more evenly distributed in the structure, thereby improving the durability and service life of the structure. Furthermore, it can adapt to the needs of different sizes and shapes: the design of the variable diameter section can be adjusted according to actual needs to adapt to the needs of structures of different sizes and shapes.

[0043] In the present application, the extension length of the diameter-changing section in the radial direction of the first cover body 11 is specifically the straight-line distance between two sides of the diameter-changing section.

[0044] In one embodiment, the reinforcement structure 14 extends from the second cover body 12 to the first cover body 11. This arrangement increases the contact area between the reinforcement structure 14 and the connecting portion 13, thereby increasing the structural strength of the connecting portion as much as possible to meet the use requirements.

[0045] In one embodiment, both side edges of the connection portion 13 along the circumference of the top cover 1 are spaced from the reinforcing structure 14. This arrangement can prevent the reinforcing structure 14 from contacting and interfering with other components, thereby facilitating the connection and coordination between the top cover 1 and other components.

[0046] In one embodiment, each connecting portion 13 is provided with a reinforcing structure 14. This arrangement can maximize the structural strength of the top cover 1, thereby facilitating a longer service life thereof.

[0047] In one embodiment, the reinforcement structure 14 is located on one side of the protrusion of the connection portion 13. Of course, in other embodiments of the present application, the reinforcement structure 14 can also be arranged on both sides of the connection portion 13, and the specific arrangement should be selected according to the use environment of the device.

[0048] In one embodiment, the axis of the first cover 11 is parallel to the axis of the second cover 12. When the axes of the first cover 11 and the second cover 12 are parallel, the connection between them is more stable, which helps to enhance the overall structural strength of the cover. This design enables the cover to better resist deformation and damage when subjected to external forces.

[0049] The parallel axis design helps optimize the distribution of stress inside the cover and reduce the risk of structural damage caused by stress concentration. This helps to improve the reliability and durability of the cover. At the same time, the parallel axis design makes the cover easier to manufacture. Manufacturers can use standardized production processes and tools to manufacture these covers, thereby reducing production costs and improving production efficiency. In addition, the parallel design of the two cover axes helps ensure their precise alignment during assembly. This can reduce assembly errors and improve assembly accuracy, thereby ensuring the performance and safety of the cover. And the parallel axis design makes it easier to disassemble and replace the cover. This helps to reduce maintenance costs and improve battery availability and reliability.

[0050] In one embodiment, the axis of the first cover body 11 coincides with the axis of the second cover body 12. This can further improve the overall structural strength of the top cover 1, thereby extending the service life of the top cover 1 as much as possible.

[0051] In a second aspect, an embodiment of the present invention provides a battery cap, the battery cap comprising the above-mentioned top cover 1.

[0052] In a third aspect, an embodiment of the present invention provides a battery, the battery comprising the above-mentioned battery cap.

[0053] By applying the technical solution of the present invention, a reinforcing structure 14 is provided on the connecting portion 13 between the first cover body 11 and the second cover body 12, so that the structural strength of the connecting portion 13 can be increased, thereby increasing the range of optional base materials for the top cover 1, facilitating subsequent research and development, and also extending the service life of the connecting portion 13, thereby facilitating the normal use of the top cover 1.

[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0055] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0056] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0057] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0058] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A top cover, characterized in that: The top cover comprises: The first cover, A second cover body is spaced apart from the first cover body, A plurality of connection parts are arranged between the first cover body and the second cover body, wherein a first end of the connection part is connected to the first cover body, a second end of the connection part is connected to the second cover body, and the plurality of connection parts are arranged at intervals along the circumference of the second cover body; The reinforcing structure is arranged on the connecting portion, and the reinforcing structure is protrudingly arranged on the surface of the connecting portion.

2. The top cover according to claim 1, characterized in that: An extension length of the connecting portion in the radial direction of the first cover body is L1, and an extension length of the reinforcing structure in the radial direction of the first cover body is L2, where L1-L2>1 mm.

3. The top cover according to claim 2, characterized in that: 2.6mm≤L1≤8.4mm, 1.5mm≤L2≤7.4mm.

4. The top cover according to any one of claims 1 to 3, characterized in that: The extension length of the reinforcement structure in the axial direction of the first cover body is L3, 1mm≤L3≤1.9mm.

5. The top cover according to any one of claims 1 to 3, characterized in that: The thickness of the reinforcement structure is L4, 0.25mm≤L4≤0.5mm.

6. The top cover according to any one of claims 1 to 3, characterized in that: The reinforcement structure comprises a diameter-changing section, and an extension length of the diameter-changing section in the radial direction of the first cover body gradually increases from the second cover body toward the first cover body.

7. The top cover according to any one of claims 1 to 3, characterized in that: The reinforcement structure extends from the second cover body to the first cover body.

8. The top cover according to any one of claims 1 to 3, characterized in that: Both side edges of the connection portion along the circumference of the top cover are spaced from the reinforcement structure.

9. The top cover according to any one of claims 1 to 3, characterized in that: Each of the connecting parts is provided with the reinforcing structure.

10. The top cover according to any one of claims 1 to 3, characterized in that: The reinforcement structure is located on one side of the protrusion of the connecting portion.

11. The top cover according to any one of claims 1 to 3, characterized in that: An axis of the first cover body and an axis of the second cover body are parallel to each other.

12. The top cover according to any one of claims 1 to 3, characterized in that: The axis of the first cover body coincides with the axis of the second cover body.

13. A battery cap, characterized in that: The battery cap comprises: a top cover as claimed in any one of claims 1-12.

14. A battery, characterized in that: The battery comprises the battery cap as claimed in claim 13.

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