Battery cover plate and battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery cover plate and a battery, the battery cover plate comprises a polished aluminum sheet, upper plastic and a sealing ring, the polished aluminum sheet is provided with a pole hole for a pole of the battery to pass through; the upper plastic is made of an insulating material and is attached to the smooth aluminum sheet, and the upper plastic is provided with a through hole for the pole of the battery to pass through; the sealing ring is made of an insulating material and penetrates through the pole hole, the sealing ring is used for blocking the smooth aluminum sheet and the pole of the battery in the radial direction, and the two ends of the pole hole are located between the two end faces, in the hole center direction of the pole hole, of the sealing ring and are arranged at intervals with the two end faces. According to the scheme, the sealing ring and the smooth aluminum sheets at the two ends of the pole hole are arranged at intervals, the path from the smooth aluminum sheets to the gap of the pole is prolonged, and metal wires or burrs need to cross a certain distance in the axial direction and then penetrate through the gap between the sealing ring and the upper plastic in the radial direction to be connected.

Description

Technical Field

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

[0002] As lithium battery technology matures, lithium batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium batteries are increasing. Among them, the top cover, as an accessory in lithium batteries, firstly acts as a seal by isolating the internal and external environments after welding with the aluminum shell; secondly, it connects the internal and external circuits and transmits the internal current of the battery to the outside through the top cover pole, playing a guiding role.

[0003] The riveted cover of a lithium battery is generally composed of a riveted block, a pole, a sealing ring, an upper plastic, a lower plastic, and a plain aluminum sheet riveted together through a riveted structure. In the prior art, when the riveted cover is assembled, the plain aluminum sheet, the lower surface of the upper plastic, and the upper surface of the sealing ring are coplanar. At this time, if there are metal wires or burrs on the edge of the pole hole or the edge of the pole on the plain aluminum sheet, the metal wires or burrs may be sandwiched between the lower surface of the upper plastic and the upper surface of the sealing ring, reducing the creepage distance, or even connecting the plain aluminum sheet and the pole, thereby causing insulation failure. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a battery cover and a battery to reduce the risk of insulation failure of the battery.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a battery cover plate, which is applied to a battery, comprising:

[0006] A plain aluminum sheet, wherein the plain aluminum sheet is provided with a pole hole for the pole of the battery to pass through;

[0007] An upper plastic, made of insulating material and attached to the bare aluminum sheet, the upper plastic being provided with a through hole for the pole of the battery to pass through;

[0008] A sealing ring is made of insulating material and is disposed in the pole hole. The sealing ring is used to radially block the bare aluminum sheet and the pole of the battery. The two ends of the pole hole are located between the two end faces of the sealing ring in the center direction of the pole hole and are spaced apart from the two end faces.

[0009] In a specific embodiment of the present invention, the portion of the upper plastic located on the outer periphery of the through hole facing the plain aluminum sheet is the first end face, and the end face of the sealing ring at one end in the direction of the through hole center is located on the side of the first end face away from the plain aluminum sheet.

[0010] In a specific embodiment of the present utility model, a convex portion protruding towards the light aluminum sheet is provided at a position on the upper plastic outside the periphery of the through hole, and the first end face is the convex surface of the convex portion.

[0011] In a specific embodiment of the present utility model, the convex portion is arranged around the outside of the through hole.

[0012] In a specific embodiment of the present utility model, a groove portion is provided at a position on the light aluminum sheet corresponding to the outside of the pole column hole, and the groove portion is used to accommodate the convex portion. The groove wall on the side of the groove portion close to the pole column hole is in an open shape.

[0013] In a specific embodiment of the present utility model, the groove portion is arranged around the outside of the pole column hole.

[0014] In a specific embodiment of the present utility model, the width of the convex portion in the radial direction of the through hole is smaller than the width of the groove portion in the radial direction of the pole column hole.

[0015] In a specific embodiment of the present utility model, the protruding height of the convex portion is smaller than the groove depth of the groove portion.

[0016] In a specific embodiment of the present utility model, an inward flanging is provided at one end of the through hole away from the light aluminum sheet, and the inward flanging is attached to the end face of one end of the sealing ring.

[0017] The present utility model also provides a battery, including the battery cover plate as described above.

[0018] The present utility model provides a battery cover plate and a battery. In the above solution, the sealing ring and the light aluminum sheets at both ends of the pole column hole are arranged at intervals, which extends the path of the gap from the light aluminum sheet to the pole column. Metal wires or burrs need to cross a certain distance axially and then pass through the gap between the sealing ring and the upper plastic in the radial direction to cause connection. In this way, even if there are metal wires or burrs, it is difficult to cross a longer path to cause a short circuit between the light aluminum sheet and the pole column. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a cross-sectional view of a riveting cover plate in the prior art;

[0021] Figure 2 It is a cross-sectional view of a riveting cover plate in an embodiment of the present utility model;

[0022] Figure 3 In an embodiment of the present utility model Figure 2 is an enlarged view of part B;

[0023] Figure 4 is a schematic structural view of the upper plastic in an embodiment of the present utility model;

[0024] Figure 5 In an embodiment of the present utility model Figure 4 is a cross-sectional view taken along line E-E;

[0025] Figure 6 In an embodiment of the present utility model Figure 5 is an enlarged view of part A;

[0026] Figure 7 is a schematic structural view of the light aluminum sheet in an embodiment of the present utility model;

[0027] Figure 8 In an embodiment of the present utility model Figure 4 is a cross-sectional view taken along line F-F;

[0028] Figure 9 In an embodiment of the present utility model Figure 5 is an enlarged view of part C.

[0029] Explanation of reference numerals: 10, light aluminum sheet; 11, pole hole; 12, groove part; 20, upper plastic; 21, through hole; 22, convex part; 23, inward flange; 30, sealing ring; 40, pole. Detailed implementation manners

[0030] The following uses specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand the other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0031] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present utility model in a schematic manner. Therefore, only the components related to the present utility model are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0032] The riveted cover plate, as a key component of the battery, plays an important role. Lithium batteries are widely used in electric vehicles and energy storage systems, and have strict requirements for their performance and safety. As part of the lithium battery, the riveted cover plate has multiple functions, including sealing the internal environment of the battery and conducting current.

[0033] The light aluminum sheet 10 in the riveted cover plate mainly functions as conducting electricity and connecting in the battery. In the lithium battery module, the light aluminum sheet 10 is used as a battery connecting piece, and the battery cells are connected together through methods such as laser welding to form a large battery monomer. The light aluminum sheet 10 has good electrical conductivity and can effectively transfer and distribute the current between the battery cells to ensure the normal operation of the battery pack.

[0034] As Figure 1 shown is the structure of the riveted cover plate in the prior art, which includes an upper plastic 20, a lower plastic, a sealing ring 30, a pole column 40, and a light aluminum sheet 10 clamped between the upper plastic 20 and the lower plastic. The pole column 40 passes through the upper plastic 20, the lower plastic, and the light aluminum sheet 10. The sealing ring 30 is used for insulating and blocking the light aluminum sheet 10 and the pole column 40. During the assembly process of the riveted cover plate, the lower surface of the light aluminum sheet 10, the lower surface of the upper plastic 20, and the upper surface of the sealing ring 30 are usually designed to be coplanar on three sides. This design ensures a tight structure during assembly, prevents the external environment from affecting the inside of the battery, and at the same time ensures the electrical insulation performance of the battery. However, if there are metal wires or burrs on the edge of the light aluminum sheet 10 or the pole column 40, these substances may be embedded between the lower surface of the upper plastic 20 and the upper surface of the sealing ring 30, resulting in a reduction in the creepage distance and even a risk of insulation failure.

[0035] As Figure 2 、 3 shown, the present utility model provides a battery cover plate applied to a battery, which includes a light aluminum sheet 10, an upper plastic 20, and a sealing ring 30.

[0036] A pole column hole 11 for the pole column 40 of the battery to pass through is formed on the light aluminum sheet 10. This enables the pole column 40 to accurately connect to the internal circuit of the battery, ensuring the effective conduction of current. It ensures that the pole column 40 can safely pass through the upper plastic 20, and at the same time provides necessary insulation protection to prevent short - circuit of the internal circuit of the battery or other safety problems.

[0037] The upper plastic 20 is made of an insulating material and is attached to the light aluminum sheet 10. A through - hole 21 for the pole column 40 of the battery to pass through is formed on the upper plastic 20.

[0038] The sealing ring 30 is made of insulating material and is arranged in the pole hole 11. The sealing ring 30 is used to radially block the bare aluminum sheet 10 and the pole 40 of the battery. The two ends of the pole hole 11 are located between the two end faces of the sealing ring 30 in the center direction of the pole hole 11 and are arranged at intervals with the two end faces. The sealing ring 30 effectively blocks the contact between the bare aluminum sheet 10 and the battery pole 40 in the radial direction, thereby ensuring the electrical insulation performance of the battery. The design of the sealing ring 30 makes its two ends located between the two end faces of the pole hole 11 and maintains a certain interval between the two end faces. This spacing arrangement increases the path length of the bare aluminum sheet 10 to the pole 40. Due to the spacing arrangement between the sealing ring 30 and the bare aluminum sheet 10 at both ends of the pole hole 11, the gap path of the bare aluminum sheet 10 to the pole 40 is effectively extended. In this way, even if there are metal wires or burrs, they need to cross a certain distance in the axial direction and then pass through the gap between the sealing ring 30 and the upper plastic 20 in the radial direction to connect. This design greatly reduces the risk of short circuit between the bare aluminum sheet 10 and the pole 40 caused by metal wires or burrs.

[0039] like Figure 3 , 4 As shown in Figures 5 and 6, the part of the upper plastic 20 located at the outer periphery of the through hole 21 and facing the side of the plain aluminum sheet 10 is the first end face, and the end face of the sealing ring 30 at one end in the direction of the center of the through hole 21 is located on the side of the first end face away from the plain aluminum sheet 10. The side of the upper plastic 20 facing the plain aluminum sheet 10 is the side facing the inside of the battery, and the side of the first end face away from the plain aluminum sheet 10 is the side facing the outside of the battery, that is, the end face of the sealing ring 30 at one end in the direction of the center of the through hole 21 is the outer end face of the sealing ring 30, that is, Figure 3 The upper end surface shown. The above solution is that the lower surface of the upper plastic 20 is partially offset from the upper end surface of the sealing ring 30. The cross section of the sealing ring 30 is "L" shaped, and the transverse section of the "L" shape is located at the inner end of the sealing ring 30. This ensures that the sealing ring 30 forms an effective isolation layer between the bare aluminum sheet 10 and the battery pole 40, protecting the internal structure of the battery from the influence of the external environment, while improving the durability and safety of the battery. The offset arrangement helps to enhance the sealing and electrical insulation properties, while reducing the alignment problems that may occur during the assembly process. The offset arrangement between the sealing ring 30 and the upper plastic 20 can also prevent possible dust or liquid intrusion, thereby protecting the long-term stability of the internal components of the battery.

[0040] like Figure 3 , 6As shown, a protruding portion 22 protruding towards the optical aluminum sheet 10 is provided at a position on the upper plastic 20 outside the periphery of the through hole 21, and the first end face is the protruding surface of the protruding portion 22. One side wall of the protruding portion 22 is the hole wall of the through hole 21, so that a seal can be formed between one side wall of the protruding portion 22 and the sealing ring 30, further reducing the probability of metal wires or burrs passing through the sealed connecting pole 40 and the optical aluminum sheet 10, thereby reducing the risk of causing a short circuit.

[0041] As Figure 4 shown, the protruding portion 22 is disposed around the outer periphery of the through hole 21. The protruding portion 22 is arranged around the edge or outside of the through hole 21, rather than only at a specific part or corner of the through hole 21. This design helps to ensure uniform support and sealing around the through hole 21, thereby enhancing the stability and reliability between components. The protruding portion 22 is generally an annular protrusion.

[0042] As Figure 3 、 7 、8, 9 shown, a groove portion 12 is provided at a position on the optical aluminum sheet 10 corresponding to the outer periphery of the pole hole 11. The groove portion 12 is used to accommodate the protruding portion 22, and the groove wall on the side of the groove portion 12 close to the pole hole 11 is open. The design of the groove portion 12 is intended to accommodate the above-mentioned protruding portion 22 to ensure the correct positioning and installation of the upper plastic 20 and the sealing ring 30. This structure can provide additional support and positioning to ensure the precise docking between components. The groove portion 12 is not completely closed at the side close to the pole hole 11 but is open. To prevent metal wires or burrs from connecting the pole 40 and the optical aluminum sheet 10 on the groove wall of the groove portion 12.

[0043] As Figure 8 shown, the groove portion 12 is disposed around the outer periphery of the pole hole 11. The groove portion 12 forms a continuous structure or a specific shape surrounding the entire hole along the periphery of the pole hole 11. The groove portion 12 is generally an annular groove.

[0044] As Figure 3 shown, the width of the protruding portion 22 in the radial direction of the through hole 21 is smaller than the width of the groove portion 12 in the radial direction of the pole hole 11. The groove portion 12 is designed to be wider so that the protruding portion 22 can be more completely accommodated. This width difference helps to ensure the quick alignment of the protruding portion 22 in the groove.

[0045] As Figure 3As shown, the protruding height of the protruding portion 22 is less than the groove depth of the groove portion 12. This ensures that the main body portion of the light aluminum sheet 10 can be completely attached to the main body portion of the upper plastic 20, without causing unnecessary space occupation or interference due to the excessive height of the protruding portion 22. The depth of the groove portion 12 allows the protruding portion 22 to be safely embedded therein, ensuring the overall assembly and functionality.

[0046] As Figure 3 , 6 shown, an inward flanging 23 is provided at one end of the through hole 21 away from the light aluminum sheet 10, and the inward flanging 23 is attached to the end face of one end of the sealing ring 30. This ensures that the sealing ring 30 can be correctly installed around the through hole 21 during assembly, and its end face forms an effective seal with the surface of the light aluminum sheet 10. This attachment can improve the reliability and durability of the seal, ensuring that the device or component does not leak or break during use.

[0047] The present utility model also provides a battery, including the battery cover plate as described above.

[0048] In summary, the present utility model proposes a battery cover plate and a battery. In the above solution, the sealing ring 30 is arranged at intervals with the light aluminum sheets 10 at both ends of the pole hole 11. This arrangement increases the path length from the light aluminum sheet 10 to the pole 40. This means that the wire or burr must span a certain distance axially and then pass through the gap between the sealing ring 30 and the upper plastic 20 radially to connect to the light aluminum sheet 10. This extended path greatly reduces the possibility of short circuit caused by the wire or burr. This design effectively prevents the wire or burr from directly passing through the sealing ring 30 from the pole 40 to the light aluminum sheet 10, thereby avoiding the short circuit problem in the battery or the battery cover plate. By increasing the path length, the system improves the short-circuit resistance ability and enhances the reliability and safety of the overall assembly.

[0049] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not used to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

[0050] In the description herein, numerous specific details are provided, such as examples of components and / or methods, to provide a thorough understanding of embodiments of the present utility model. However, those skilled in the art will recognize that embodiments of the present utility model can be practiced without one or more of the specific details or with other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present utility model.

[0051] Throughout the specification, reference to "an embodiment", "embodiment", or "specific embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present utility model and not necessarily in all embodiments. Thus, each appearance of the phrases "in an embodiment", "in embodiments", or "in a specific embodiment" in various places throughout the specification is not necessarily referring to the same embodiment. Additionally, the particular features, structures, or characteristics of any specific embodiment of the present utility model can be combined in any suitable manner with one or more other embodiments. It should be understood that other variations and modifications of the embodiments of the utility model described and shown herein may be made in accordance with the teachings herein and will be considered part of the spirit and scope of the present utility model.

[0052] It should also be understood that one or more of the elements shown in the drawings can be implemented in a more separated or more integrated manner, or even removed if inoperable in some cases or provided if useful for a particular application.

[0053] Furthermore, unless otherwise explicitly specified, any marked arrows in the drawings should be considered exemplary only and not restrictive. Additionally, unless otherwise indicated, the term "or" as used herein generally intends to mean "and / or". In cases where the term is ambiguous due to the ability to provide separation or combination, the combination of components or steps will also be considered to have been specified.

[0054] As used in the description herein and throughout the following claims, unless otherwise indicated, "a", "an", and "the" include plural references. Similarly, as used in the description herein and throughout the following claims, unless otherwise indicated, the meaning of "in" includes "in" and "on".

[0055] The foregoing description of the embodiments shown in the present utility model (including that described in the abstract of the specification) is not intended to be exhaustive or to limit the present utility model to the precise forms disclosed herein. Although specific embodiments of the present utility model and examples of the present utility model are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present utility model as will be recognized and understood by those skilled in the art. As noted, these modifications can be made to the present utility model in accordance with the foregoing description of the embodiments of the present utility model, and these modifications will be within the spirit and scope of the present utility model.

[0056] The systems and methods have been described generally herein to assist in understanding the details of the present utility model. Additionally, various specific details have been given to provide a general understanding of embodiments of the present utility model. However, those skilled in the relevant art will recognize that embodiments of the present utility model may be practiced without one or more of the specific details, or with other devices, systems, components, methods, assemblies, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been shown or described in detail to avoid obscuring aspects of the embodiments of the present utility model.

[0057] Accordingly, although the present utility model has been described herein with reference to its specific embodiments, modifications, various changes and substitutions are also within the foregoing disclosure, and it should be understood that in some instances, some features of the present utility model will be employed without corresponding use of other features without departing from the scope and spirit of the claimed utility model. Therefore, many modifications may be made to adapt a particular environment or material to the essential scope and spirit of the present utility model. The present utility model is not intended to be limited to the specific terms and / or the specific embodiments disclosed as the best mode contemplated for carrying out the present utility model, but the present utility model will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the present utility model will be determined only by the appended claims.

Claims

1. A battery cover plate, applied to a battery, characterized in that, include: A plain aluminum sheet, wherein the plain aluminum sheet is provided with a pole hole for the pole of the battery to pass through; An upper plastic, made of insulating material and attached to the bare aluminum sheet, the upper plastic being provided with a through hole for the pole of the battery to pass through; A sealing ring is made of insulating material and is disposed in the pole hole. The sealing ring is used to radially block the bare aluminum sheet and the pole of the battery. The two ends of the pole hole are located between the two end faces of the sealing ring in the center direction of the pole hole and are spaced apart from the two end faces.

2. The battery cover plate according to claim 1, wherein, The portion of the upper plastic located at the outer periphery of the through hole facing the plain aluminum sheet is the first end face, and the end face of the sealing ring at one end in the direction of the through hole center is located on the side of the first end face away from the plain aluminum sheet.

3. The battery cover plate according to claim 2, wherein, A convex portion protruding toward the smooth aluminum sheet is provided on the upper plastic at the periphery of the through hole, and the first end surface is a convex surface of the convex portion.

4. The battery cover plate according to claim 3, wherein, The protrusion is arranged around the outer circumference of the through hole.

5. The battery cover plate according to claim 3, characterized in that, The bare aluminum sheet is provided with a groove portion at a peripheral position corresponding to the pole hole, the groove portion is used to accommodate the protrusion, and the groove wall of the groove portion close to the pole hole is open.

6. The battery cover plate according to claim 5, characterized in that, The groove portion is disposed around the outer circumference of the pole hole.

7. The battery cover plate according to claim 5, characterized in that, The width of the protrusion in the radial direction of the through hole is smaller than the width of the groove in the radial direction of the pole hole.

8. The battery cover plate according to claim 5, characterized in that, The protruding height of the protruding portion is smaller than the groove depth of the groove portion.

9. The battery cover plate according to claim 1, characterized in that, An end of the through hole away from the smooth aluminum sheet is provided with an inner turn-down edge, and the inner turn-down edge is in contact with an end surface of one end of the sealing ring.

10. A battery, characterized in that, It comprises a battery cover as described in any one of claims 1-9.

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