Battery cover plate and secondary battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery cover plate and a secondary battery, the battery cover plate comprises a cover plate body, a pole assembly and an insulating plate, the cover plate body is provided with a pole hole, the pole assembly comprises a pole body, the pole body is inserted into the pole hole, and the insulating plate is arranged on the pole body. An extension part extending to the inner side of the cover plate body along a first direction is arranged on the pole body, the first direction is the thickness direction of the battery, and the extension part is arranged between the extension part and the cover plate body; wherein an accommodating cavity for accommodating a tab is formed between the insulating plate and the extension part, the end surface of one side of the extension part is a welding surface for welding the tab, and the welding surface forms a cavity wall of one side of the accommodating cavity. The polar column and the tabs share the height space, so that the tabs are prevented from occupying extra height space, and the overall height of the polar column is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery cover plate and secondary battery. BACKGROUND

[0002] The rapid development of new energy technology puts forward higher requirements to the battery cell technology, especially improving the space utilization rate of the battery cell, which is crucial to the improvement of the energy density of the battery cell.

[0003] In the prior art, the pole post is usually stacked and welded with the tab in the thickness direction of the cover plate, so that the tab causes the overall height of the pole post and the tab after welding to be high, which affects the energy density of the battery cell. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the utility model aims to provide a battery cover plate and secondary battery which can reduce the height of the pole post and thus improve the energy density of the battery.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a battery cover plate, which comprises:

[0006] A cover plate body is provided with a pole post hole;

[0007] A pole post assembly comprises a pole post body which is inserted into the pole post hole, and the pole post body is provided with an extension part extending into the inside of the cover plate body along a first direction, and the first direction is the thickness direction of the battery;

[0008] An insulating plate is arranged between the extension part and the cover plate body;

[0009] The insulating plate and the extension part have a containing cavity for containing the tab, one side end face of the extension part is a welding face for welding the tab, and the welding face constitutes one side cavity wall of the containing cavity.

[0010] In an optional embodiment of the utility model, the extension part is located at the inner end of the pole post body, the extension part and the insulating plate are arranged in a spaced manner to constitute the containing cavity, and the outer end face of the extension part is the welding face.

[0011] In an optional embodiment of the utility model, the cover plate body comprises a separately formed pre-riveting cover plate and an outer ring cover plate, the pre-riveting cover plate and the outer ring cover plate are welded and connected, the pole post hole is formed in the pre-riveting cover plate, and the pre-riveting cover plate avoids the projection of the containing cavity in the thickness direction of the pole post body.

[0012] In an optional embodiment of the utility model, the pre - riveting cover plate and the outer ring cover plate have the step structure of mutual carding between them, the inside width of step structure is greater than the outside width.

[0013] In an optional embodiment of the utility model, the accommodating cavity thickness is greater than or equal to the thickness of the tab.

[0014] In an optional embodiment of the utility model, the cover plate body and the insulating plate inner end are concave.

[0015] In an optional embodiment of the utility model, the accommodating cavity is arranged with the pole body spacing in the radial direction.

[0016] In an optional embodiment of the utility model, the accommodating cavity is arranged with the pole body spacing distance greater than 0.2mm in the radial direction.

[0017] In an optional embodiment of the utility model, the welding face forms the welding mark, and the welding mark is covered with welding mark protection glue.

[0018] The utility model also provides a secondary battery, including the battery cover plate, and the electric core and shell, the shell is connected with the battery cover plate, to form the cavity for receiving the electric core, the electric core is received in the cavity, and the tab of electric core is electrically connected with the pole body.

[0019] The technical effect of the utility model is that: through the pole and the tab share height space mode, avoid the tab to occupy additional height space, thereby effectively reduce the overall height of pole. This design improves the space utilization of battery, and then improves the volume energy density of battery. Through this optimization, not only help to improve the performance of battery, but also can satisfy the product design demand of lighter, more compact. ACCURACY

[0020] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be needed to introduce the drawing of the embodiment description, and obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0021] Figure 1 It is the perspective view of the battery cover plate provided by the embodiment of the utility model;

[0022] Figure 2 It is the top view of the battery cover plate provided by the embodiment of the utility model;

[0023] Figure 3 It is Figure 2 A-A sectional view of

[0024] Figure 4 is a B partial enlarged view of the embodiment of the utility model; Figure 3

[0025] Figure 5 is an assembly schematic view of the pole body and the tab provided by the embodiment of the utility model;

[0026] Figure 6 is a perspective view of the pole body provided by the embodiment of the utility model;

[0027] Figure 7 is a welding schematic view of the pole body and the tab provided by the embodiment of the utility model;

[0028] Figure 8 is a C partial enlarged view of the embodiment of the utility model; Figure 7

[0029] Figure 9 is a manufacturing process diagram of the battery cover plate provided by the embodiment of the utility model.

[0030] Mark 1, tab; 2, battery cell; 10, cover plate body; 11, pre-riveted cover plate; 12, outer ring cover plate; 20, insulating plate; 30, pole body; 31, extension; 40, accommodating cavity. DETAILED DESCRIPTION

[0031] The embodiments of the utility model will be described below through specific concrete examples, and other advantages and effects of the utility model can be easily understood by those skilled in the art from the disclosure of the specification. The utility model can also be implemented or applied through other different specific embodiments, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0032] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the utility model in a schematic manner, and only the components related to the utility model are shown in the diagrams, not the number, shape and size of the components during actual implementation. The shape, number and proportion of each component during actual implementation can be changed arbitrarily, and the component layout pattern can also be more complex.

[0033] In the description of the utility model, the "inner" and "outer" are based on the cavity of the battery, that is, the side or end close to the battery cavity is the inner side or end, and the side or end far from the battery cavity is the outer side or end.

[0034] ​​A secondary battery, also known as a rechargeable battery or energy storage battery, is a battery that can be charged by an external electrical source and release electrical energy when needed. A secondary battery includes a casing, a battery cell 2, and a cover plate. The battery cell 2 is housed inside the casing, and the cover plate is connected to the casing to enclose the battery cell 2 inside the casing. The cover plate is generally provided with terminals. The inner end of the terminal is connected to the tab 1 of the battery cell 2, and the outer end of the terminal is exposed outside the cover plate for connecting to a busbar.

[0035] In existing technologies, the design and manufacturing method of the terminals have a significant impact on battery performance. The inner end of the terminal is connected to the tab 1 of the cell 2 by welding, while the outer end is exposed outside the cover plate. However, the traditional welding method for the terminal and tab 1 usually uses a superimposed welding technique. This method results in a relatively high overall height of the terminal and tab 1 after welding, thus affecting the energy density of the cell 2. The energy density of the cell 2 is directly related to the battery's performance and the compactness of its overall design, especially in applications such as electric vehicles, portable electronic devices, and renewable energy storage, where the battery's size and weight need to be minimized.

[0036] Therefore, optimizing the connection between the terminals and tabs 1 while maintaining battery performance, and thus improving the energy density of the cell 2, has become one of the key research areas in current rechargeable battery technology. Adopting novel welding techniques or improved design schemes is expected to enhance the energy density and performance of the cell 2 without increasing its overall height.

[0037] like Figures 1-9 As shown, the technical solution of this utility model will be described in detail below with reference to specific embodiments:

[0038] like Figure 3 , 4 As shown, the battery cover provided in the embodiment of this utility model includes a cover body 10, a terminal assembly, and an insulating plate 20. The battery cover is used to cooperate with the housing to form a cavity for housing the battery cell 2. The terminal assembly is electrically connected to the tabs 1 of the battery cell 2 and is used to guide the input and output terminals of the battery cell 2 to the outside of the housing.

[0039] The cover plate body 10 has pole hole; in a specific embodiment, the cover plate body 10 can be made of metal material, such as a plain aluminum plate.

[0040] The terminal assembly includes a terminal body 30, which is inserted into a terminal hole. The terminal body 30 has an extension portion 31 extending along a first direction to the inner side of the cover plate body 10. The first direction is the thickness direction of the battery. The thickness direction of the battery refers to the direction perpendicular to the height and length of the battery. Figure 2The left-right direction in the figure is also the overall orientation of the tab 1 after being folded. The extension 31 extends along the thickness direction of the battery, so that the tab 1 can be naturally folded towards the outer end face of the extension 31 during welding. This design improves the efficiency and convenience of the welding process, so that the tab 1 welding can be completed in a more efficient and easy-to-operate position.

[0041] The insulating plate 20 is arranged between the extension 31 and the cover plate body 10. The extension 31 and the insulating plate 20 have a containing cavity 40 for accommodating the tab 1, and the side end face of the extension 31 is a welding surface for welding the tab 1, which constitutes a side cavity wall of the containing cavity 40. The containing cavity 40 can be a groove, a clamping cavity, a notch, or any region with a certain containing space.

[0042] The above scheme can effectively reduce the overall height of the battery by allowing the tab 1 to share space with the pole in the thickness direction of the pole. This space optimization design helps to integrate more electrical energy storage capacity in a limited volume, thereby improving the volume energy density of the battery.

[0043] As shown in Figure 3 , 4 , the extension 31 is located at the inner end of the pole body 30, the extension 31 and the insulating plate 20 are arranged in a spaced manner to form the containing cavity 40, and the outer end face of the extension 31 is the welding surface. In this way, the welding of the tab 1 can be performed on the outer end face of the extension 31. The outer end face of the extension 31 as the welding surface makes the tab 1 welding process more direct and convenient. The welding operation can be performed in a more easily accessible position, thereby improving the accuracy and efficiency of welding. By designing the containing cavity 40 as the space between the extension 31 and the insulating plate 20, the tab 1 can be effectively placed in this cavity, thereby significantly reducing the occupation of the tab 1 to the overall height space of the battery. This not only makes the battery thinner, but also meets the needs in limited space application scenarios.

[0044] As shown in Figure 3 , 4 , the cover plate body 10 includes a separately formed pre-riveting cover plate 11 and an outer ring cover plate 12, the pre-riveting cover plate 11 and the outer ring cover plate 12 are welded and connected, the pole hole is opened in the pre-riveting cover plate 11, and the pre-riveting cover plate 11 avoids the projection of the containing cavity 40 in the thickness direction of the pole body 30. The processing technology of the battery cover plate in the prior art is riveting first and then welding. Since the welding surface in the present application is located at the outer end face of the extension 31, if the cover plate body 10 is riveted first, the cover plate body 10 will block the welding position. Therefore, the cover plate body 10 is divided into two parts in the present application, as shown in Figure 9As shown, the manufacturing process of the battery in this application is to first rivet the pre-riveting cover plate 11 with the pole assembly, then weld the tab 1, then fold the battery to make the core, then weld the outer cover plate 12 on the pre-riveting cover plate 11 to form a complete cover plate body 10, and finally weld the battery cover plate with the battery shell.

[0045] The above scheme sets the welding surface at the outer end face of the extension 31, so that the welding process will not be blocked by the cover plate body 10. By first riveting the pre-riveting cover plate 11 and then welding the tab 1, the direct accessibility of the welding interface is ensured, and the complexity of the operation is reduced. If the traditional integrated cover plate is used, the riveting and welding processes may interfere with each other. By dividing the cover plate into two parts, the conflict in the assembly process can be avoided, and the risk of assembly errors can be reduced.

[0046] As shown in Figure 3 , 4 , the pre-riveting cover plate 11 and the outer cover plate 12 have a step structure that fits each other, and the inner width of the step structure is greater than the outer width. The design of the inner width being greater than the outer width makes it easier to align during assembly. The pre-riveting cover plate 11 can be positioned within the step structure of the outer cover plate 12, thereby ensuring the accuracy of the assembly. The step structure can form positioning in the height direction and the horizontal direction. Thanks to the step structure, the accurate positioning of the pre-riveting cover plate 11 and the outer cover plate 12 can be ensured before welding, thereby avoiding the need to use additional positioning auxiliary tools. This not only saves time and manpower, but also reduces the complexity of the operation. The self-positioning step structure can accurately maintain the gap and alignment between the cover plates, ensuring the accuracy of the welding joint position. This accuracy is crucial in ensuring the quality of the weld and the safety of the battery, reducing welding defects caused by misalignment.

[0047] As shown in Figure 3 , 4 , the thickness of the accommodating cavity 40 is greater than or equal to the thickness of the tab 1. The design of the accommodating cavity 40 allows the tab 1 to have better positional tolerance, reduces the alignment error during assembly, improves the assembly accuracy, and ensures good electrical contact of the tab 1. The larger thickness of the accommodating cavity 40 provides designers with greater flexibility, allowing them to adjust the size or shape of the tab 1 as needed to adapt to different battery configurations or performance requirements.

[0048] As shown in Figure 3 , 4As shown, the cover plate body 10 and the upper end of the insulating plate 20 are concave. The upper concave part constitutes a space for accommodating the tab 1 and the extension 31. The upper concave part provides additional space, allowing the tab 1 and the extension 31 to be better embedded, reducing the volume of the overall structure, improving the utilization efficiency of space, and being particularly suitable for battery systems with limited design space. This design can provide a more stable fixing position for the tab 1, reducing the risk of loosening caused by vibration or impact during use, thereby improving the reliability of electrical connection.

[0049] As shown in Figure 3 、 4 The accommodation cavity 40 is arranged radially apart from the pole body 30. Radial refers to the radial direction of the pole, i.e. the width direction of the pole. The tab 1 fully covers the welding surface to improve the conductivity and connection stability of the welding, which is the optimal design choice. However, the tab 1 needs to be pressed by a tool to maintain stability during welding, so the distance between the tool and the tab 1 needs to be considered in actual operation.

[0050] The accommodation cavity 40 is radially spaced apart from the pole body 30 by a distance greater than 0.2mm. If the tab 1 is too close to the edge of the welding base plate, the tool may interfere with the welding process when pressing the tab 1, affecting the quality and uniformity of the welding. A distance of 0.2mm can effectively avoid this situation.

[0051] In an optional embodiment of the present application, a welding mark is formed on the welding surface, and a welding mark protective glue is covered on the welding mark. The coverage of the welding mark protective glue can effectively cover the burrs or irregular protrusions on the welding mark, thereby avoiding the sharp parts piercing the insulation layer and preventing short circuit and other electrical faults.

[0052] The utility model also provides a secondary battery, including the battery cover plate, and the electric core 2 and the shell, the shell is connected with the battery cover plate, forms the cavity for accommodating the electric core 2, the electric core 2 is accommodated in the cavity, and the tab 1 of the electric core 2 is electrically connected with the pole body 30.

[0053] In summary, the technical advantages of this invention are as follows: by sharing the height space between the terminal post and the tab 1, the tab 1 avoids occupying additional height space, thereby effectively reducing the overall height of the terminal post. This design improves the space utilization of the battery, thereby increasing the volumetric energy density of the battery. This optimization not only helps improve battery performance but also meets the requirements for thinner and more compact product designs. Furthermore, by riveting the pre-riveted cover plate 11 before welding the tab 1, direct accessibility of the welding interface is ensured, reducing operational complexity. If a traditional one-piece cover plate is used, the riveting and welding processes may interfere with each other. By dividing the cover plate into two parts, conflicts during assembly can be avoided, reducing the risk of assembly errors.

[0054] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0055] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0056] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0057] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0058] In addition, any arrows in the drawings are meant to indicate directional arrows, not necessarily the direction of the flow of the information. Furthermore, unless otherwise noted, the terms "or" and "and" are generally used in their inclusive sense (and not in their exclusive sense). Also, the use of "including," "comprising," or "having" has been used in the detailed description in the manner expected by one of ordinary skill in the art to denote non-exhaustive inclusions so as to allow for other like features in various examples.

[0059] As used in the description of the application and throughout the claims that follow, "a," "an," and "the" include plural references unless indicated otherwise. Also, as used in the description of the application and throughout the claims that follow, "in" includes "in" and "on" unless indicated otherwise.

[0060] The above description of the illustrated embodiments of the application (including what is described in the abstract) is not intended to be exhaustive or to limit the application to the precise forms disclosed. While specific embodiments of, and examples for, the application are described herein for illustrative purposes, various equivalent modifications are possible within the spirit and scope of the application, as those skilled in the relevant art will recognize and appreciate. As indicated, these modifications can be made to the above described embodiments of the application and yet the application will fall within the scope of the application. Therefore, other modifications and variations are within the spirit and scope of the application.

[0061] The systems and methods have been described generally at this level of detail to assist in understanding the details of the application. Also, various specific details have been given in order to provide a thorough understanding. However, a person of ordinary skill in the relevant art will realize and appreciate that embodiments of the application can be practiced without one or more of the specific details, or with other devices, systems, assemblies, methods, components, materials, parts, and the like. In other instances, well-known structures, materials, and / or operations have not been shown or described in detail to avoid obscuring aspects of embodiments of the application.

[0062] Thus, although the present application has been described herein with reference to particular embodiments thereof, modifications, alterations and substitutions are possible within the scope and spirit of the application as disclosed above and as claimed below, and it is understood that some features of the present application could be employed without a corresponding use of the other features, and in some instances, without departing from the scope and spirit of the application. Accordingly, many modifications can be made in the particular embodiments without departing from the scope and spirit of the application. The present application is not intended to be limited to the particular embodiments used in the following claims, and / or the particular examples disclosed as the best mode for carrying out the present application, but the present application will include any and all embodiments and equivalents falling within the scope of the appended claims. Thus, the scope of the present application will only be determined by the appended claims.

Claims

1. A battery cover, characterized in that, include: The cover plate body has pole hole; The terminal assembly includes a terminal body, which is inserted into the terminal hole. The terminal body has an extension portion extending along a first direction to the inner side of the cover plate body, where the first direction is the thickness direction of the battery. An insulating plate is disposed between the extension and the cover plate body; The insulating plate and the extension have a receiving cavity for accommodating the electrode tab, and one end face of the extension is a welding surface for welding the electrode tab, which forms one side wall of the receiving cavity.

2. The battery cover according to claim 1, characterized in that, The extension is located at the inner end of the pole body, and the extension is arranged at a distance from the insulating plate to form the receiving cavity. The outer end face of the extension is the welding surface.

3. The battery cover according to claim 2, characterized in that, The cover plate body includes a separately formed pre-riveted cover plate and an outer ring cover plate. The pre-riveted cover plate is welded to the outer ring cover plate. The pole hole is opened in the pre-riveted cover plate. The pre-riveted cover plate avoids the projection of the receiving cavity in the thickness direction of the pole body.

4. The battery cover according to claim 3, characterized in that, The pre-riveted cover plate and the outer ring cover plate have a stepped structure that interlocks with each other, and the inner width of the stepped structure is greater than the outer width.

5. The battery cover according to claim 1, characterized in that, The thickness of the receiving cavity is greater than or equal to the thickness of the electrode tab.

6. The battery cover according to claim 1, characterized in that, The cover plate body and the inner end of the insulating plate are recessed.

7. The battery cover according to claim 1, characterized in that, The receiving cavity is arranged radially at intervals from the pole body.

8. The battery cover according to claim 7, characterized in that, The accommodating cavity is radially spaced from the pole body by a distance greater than 0.2 mm.

9. The battery cover according to claim 1, characterized in that, A weld mark is formed on the welding surface, and the weld mark is covered with a weld mark protective adhesive.

10. A secondary battery, characterized in that, The battery includes a battery cover as described in any one of claims 1-9, a battery cell, and a housing, wherein the housing is connected to the battery cover to form a cavity for housing the battery cell, the battery cell is housed within the cavity, and the tabs of the battery cell are electrically connected to the terminal body.

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