Collecting plate, battery cell and battery pack
The self-insulating current collector design addresses the inefficiency of additional tape application in large cylindrical lithium-ion batteries by integrating an insulation sleeve, improving production efficiency and reducing costs through simplified manufacturing.
Patent Information
- Application Number
- CN202422192849.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-06
AI Technical Summary
The existing large cylindrical batteries need to be pasted with brown high-temperature tape on the current collecting plate to increase the production process, which is time-consuming and labor-intensive, resulting in high production costs.
The current collecting disk comes with an insulating member, which is arranged around the entire peripheral side wall of the current collecting body to form a flange portion to achieve insulation protection, avoid contact with the shell, and reduce manufacturing processes.
Insulation protection is achieved, short-circuit risk is avoided, production costs are reduced, and battery packaging and distribution efficiency is improved.
Smart Images
Figure CN223109167U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a current collector plate, an electric core and a battery pack. Background Art
[0002] With the rapid development of lithium-ion battery technology, large cylindrical batteries have the advantages of large capacity, high energy density and high structural consistency. At present, large cylindrical batteries adopt a unique full-tab design, so laser welding of the current collector plate is required. The current collector plate is connected to the positive terminal. Since the cylindrical battery uses a steel shell, in order to prevent the steel shell from corroding, the shell of the cylindrical battery is negatively charged. And in order to prevent contact between the current collector plate and the shell wall and cause a short circuit, often after the current collector plate is assembled, a brown high-temperature tape is pasted to achieve the purpose of insulation. In this way, an additional process is added, which is time-consuming and laborious, and the production cost and production time of the battery will increase. Summary of the Utility Model
[0003] In view of this, the purpose of this application is to provide a current collector plate, an electric core and a battery pack to solve the problem that existing large cylindrical batteries need to paste brown high-temperature tape on the current collector plate, which increases the production process, is time-consuming and laborious, and thus causes a large production cost to a certain extent.
[0004] The first aspect of the utility model provides a current collector plate, wherein the current collector plate includes:
[0005] A current collecting main body, which is arranged inside the electric core shell and has a first connection part and a second connection part, the first connection part is connected to the pole column, and the second connection part is connected to the pole group;
[0006] An insulating part, which is arranged around the entire circumferential side wall of the current collecting main body.
[0007] In the above technical solution, further, the end part of the insulating part in the axial direction of the current collecting main body is bent inward to form a flanging part covering part of the first connection part and / or part of the second connection part.
[0008] In any of the above technical solutions, further, the flanging part is formed into a closed annular structure.
[0009] In any of the above technical solutions, further, the height dimension of the flanging part in the axial direction of the current collecting main body is a, and a = 0.06 mm to 0.1 mm.
[0010] In any of the above technical solutions, further, the dimension of the flanging part in the radial direction of the current collecting main body is b, and b = 2 mm to 3 mm.
[0011] In any of the above technical solutions, further, the axial section of the flanging part is a concave structure with two grooves facing each other.
[0012] In any of the above technical solutions, further, in the axial direction of the current collecting body, the first connecting portion and the second connecting portion are disposed opposite to each other.
[0013] In any of the above technical solutions, further, the first connecting portion is formed with a protruding convex portion, and the convex portion is welded to the pole column.
[0014] The second aspect of the present utility model provides an electric core, including the current collecting plate described in any of the above technical solutions.
[0015] The third aspect of the present utility model provides a battery pack, including the electric core described in the above technical solution.
[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0017] For the current collecting plate of the present utility model, an insulating member is sleeved on the entire circumferential side wall of the current collecting body, so that the insulating member separates the current collecting body from the housing, reducing the risk of contact between the current collecting body and the housing wall, thereby achieving the purpose of insulating protection and effectively avoiding the occurrence of short circuits caused by contact. The current collecting plate of the present utility model has a self - contained insulating structure. Compared with the need to additionally paste a brown high - temperature tape on the current collecting plate, it reduces the manufacturing process of the electric core, saves time and effort, greatly reduces the production cost of the electric core while ensuring the insulating performance, thereby improving the assembly efficiency of the battery pack and reducing the total assembly cost of the battery pack.
[0018] In order to make the above - mentioned objects, features and advantages of the present application more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, detailed descriptions are as follows. Description of the Drawings
[0019] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following - described drawings are 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 top - view structural diagram of the current collecting plate provided by the embodiment of the present utility model;
[0021] Figure 2 It is a structural cross - sectional view of the current collecting plate provided by the embodiment of the present utility model;
[0022] Figure 3 It is Figure 2 An enlarged structural schematic diagram of part A in
[0023] Icon: 10 - current collecting body; 110 - first connecting part; 111 - convex part; 120 - second connecting part; 20 - insulating part; 21 - flanging part. Detailed implementation manners
[0024] The following detailed implementation manners are provided to help readers obtain a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of this application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be obvious. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein. Rather, changes that will be obvious after understanding the disclosure of this application may be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.
[0025] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be obvious after understanding the disclosure of this application.
[0026] Throughout the specification, when an element (such as a layer, region, or substrate) is described as "on" another element, "connected to" another element, "bonded to" another element, "above" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "above" another element, or "covering" another element, or there may be one or more other elements therebetween. In contrast, when an element is described as "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly above" another element, or "directly covering" another element, there may be no other elements therebetween.
[0027] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.
[0028] Although terms such as "first", "second", and "third" may be used herein to describe various components, components, regions, layers, or parts, these components, components, regions, layers, or parts are not limited by these terms. Rather, these terms are only used to distinguish one component, component, region, layer, or part from another. Thus, the first component, component, region, layer, or part referred to in the examples described herein may also be referred to as the second component, component, region, layer, or part without departing from the teachings of the examples.
[0029] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the accompanying drawings. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is flipped, an element described as "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientation of "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relationship terms used herein will be interpreted accordingly.
[0030] The terms used herein are for the purpose of describing various examples only and are not intended to limit the present disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising", "including", and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.
[0031] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the accompanying drawings may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that occur during manufacturing.
[0032] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.
[0033] According to a first aspect of the present utility model, a current collecting plate is provided, which includes a current collecting body 10 and an insulating member 20.
[0034] Hereinafter, the specific structures of the above components of the current collecting plate according to the present embodiment will be described.
[0035] In the present embodiment, as Figure 1 and Figure 2 shown, the current collecting body 10 is disposed inside the battery cell housing. The current collecting body 10 is made of a metal material and is formed into a plate-like structure, such as a circular plate-like structure. However, the shape of the current collecting body 10 is not limited thereto and may also be a polygonal shape or the like as long as it can meet the connection requirements between the electrode group and the electrode post in the battery cell.
[0036] Specifically, the current collector body 10 has a first connection portion 110 and a second connection portion 120. The first connection portion 110 is used to connect with the terminal post, and the second connection portion 120 is used to connect with the electrode group. In a preferred embodiment, as Figure 2 shown, in the axial direction of the current collector body 10, the first connection portion 110 and the second connection portion 120 are arranged opposite to each other, so that the first connection portion 110 and the second connection portion 120 are formed on the surfaces on both sides of the plate-shaped current collector body 10 in the thickness direction, which is convenient for the connection of the terminal post and the electrode group.
[0037] More specifically, in this embodiment, the current collector body 10 is respectively welded to the terminal post and the electrode group.
[0038] In this embodiment, as Figures 1 to 3 shown, the insulating member 20 is disposed around the entire circumferential side wall of the current collector body 10, so as to protect the entire circumferential side wall of the current collector body 10 and avoid the risk of short circuit caused by the current collector body 10 overlapping with the shell wall. The insulating member 20 is formed into a closed annular structure to wrap the entire circumferential side wall of the current collector body 10, thereby ensuring effective insulation between the current collector body 10 and the battery cell housing.
[0039] The insulating member 20 can be made of PP (polypropylene), which has the advantages of low cost, being cheap and light, not adding extra mass to the current collector plate, and having no reaction with the electrolyte, meeting the usage requirements of the battery cell.
[0040] In this embodiment, for the assembly of the current collector plate, the insulating member 20 can be directly sleeved on the outer circumferential wall of the current collector body 10, so that the current collector plate has a self-insulating structure. Compared with the prior art where it is necessary to paste brown high-temperature tape on the current collector plate additionally, the manufacturing process of the battery cell is reduced, saving time and effort, and greatly reducing the production cost of the battery cell while ensuring the insulation performance.
[0041] Furthermore, in this embodiment, as Figures 1 to 3 shown, the end of the insulating member 20 in the axial direction of the current collector body 10 is bent inward to form a flanging portion 21 that covers part of the first connection portion 110 and / or part of the second connection portion 120, so as to improve the effect of the insulating member 20 wrapping the entire circumference of the current collector body 10, improve the insulation performance of the insulating member 20, and also avoid relative displacement between the insulating member 20 and the current collector body 10 to a certain extent during the assembly process of the battery cell.
[0042] In this embodiment, as Figure 1 shown, the flanging portion 21 is formed into a closed annular structure to further ensure that the current collector body 10 will not contact the shell wall.
[0043] In a preferred embodiment, as Figure 2As shown in the figure, flanging portions 21 are formed at both ends of the insulating member 20 in the axial direction of the current collecting body 10. In this way, the axial cross-section of the flanging portion 21 forms a concave-shaped structure with two grooves facing each other, that is, the insulating member 20 is an annular structure formed by rotating a concave-shaped cross-section with the grooves facing the axis of the current collecting body 10 around the axis of the current collecting body 10, thereby ensuring the insulation reliability of the insulating member 20.
[0044] It should be noted that the axial direction of the current collecting body 10 (i.e., the axial direction of the current collecting body 10) is the thickness direction of the plate-shaped current collecting body 10, that is, Figure 2 the vertical direction from a certain perspective.
[0045] Furthermore, in this embodiment, as Figure 2 and Figure 3 shown, the height dimension of the flanging portion 21 in the axial direction of the current collecting body 10 is a, and a = 0.06 mm to 0.1 mm. In this way, it is avoided that due to the too large size of a, the internal space of the battery cell housing is overly occupied, resulting in energy loss of the battery cell and affecting the assembly of the battery cell. It can also avoid the situation that due to the too small size of a, there is a risk of penetration of the insulating member 20, resulting in insulation failure, thereby ensuring that the insulating member 20 has reliable and stable insulation performance.
[0046] Furthermore, in this embodiment, as Figure 2 and Figure 3 shown, the dimension of the flanging portion 21 in the radial direction of the current collecting body 10 is b, and b = 2 mm to 3 mm. In this way, it is avoided that due to the too small size of b, the insulation performance cannot be guaranteed, and thus the situation that the current collecting body 10 may still be in contact with the negative electrode may occur, resulting in a short-circuit risk. It can also avoid the situation that due to the too large size of b, the weight of the insulating member 20 is increased, which is likely to hinder the welding of the current collecting body 10 and the electrode group, thereby further ensuring that the insulating member 20 has reliable and stable insulation performance.
[0047] It should be noted that the radial direction of the current collecting body 10 is perpendicular to the axial direction of the current collecting body 10, and the radial direction of the current collecting body 10 is parallel to the plane where the current collecting body 10 is located.
[0048] In addition, in this embodiment, as Figure 1 and Figure 2 shown, the first connecting portion 110 is formed with a protruding convex portion 111 for welding connection with the pole post; specifically, the convex portion 111 is a block structure. For example, the convex portion 111 can be formed into a cylindrical block structure. However, the shape of the convex portion 111 is not limited to this, as long as it is adapted to the opening on the pole post and meets the connection requirements between the pole post and the current collecting plate. Preferably, the convex portion 111 is disposed at the middle position of the first connecting portion 110.
[0049] In an alternative embodiment, the current collecting plate is disposed on the positive electrode side inside the battery cell.
[0050] According to a current collector plate provided by the present utility model, it has a simple structure, low cost, and convenient assembly. An insulating member is sleeved on the entire circumferential side wall of the current collector main body, so that the insulating member separates the current collector main body from the housing, reducing the risk of contact between the current collector main body and the housing wall, thereby achieving the purpose of insulation protection and effectively avoiding the occurrence of short circuits caused by contact.
[0051] According to a battery cell provided by the present utility model, it includes the current collector plate as described above. The current collector plate has its own insulating structure. Compared with the need to additionally paste brown high-temperature tape on the current collector plate, the manufacturing process of the battery cell is reduced, saving time and effort, and greatly reducing the production cost of the battery cell while ensuring the insulation performance.
[0052] According to a battery pack provided by the present utility model, it includes the battery cells provided in the above embodiments. Multiple battery cells are connected to form a battery module, and the battery module is arranged in the housing of the battery pack. The manufacturing process of each battery cell is reduced, thereby improving the assembly efficiency of the battery pack and reducing the total assembly cost of the battery pack.
[0053] Finally, it should be noted that: the above-described embodiments are only specific embodiments of the present application, used to illustrate the technical solutions of the present application, rather than limiting them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present application can still modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A current collecting tray, characterized in that, The current collecting plate includes: A current collecting main body disposed inside the battery cell housing, having a first connection portion and a second connection portion, the first connection portion being connected to the pole column and the second connection portion being connected to the electrode group; An insulating member surrounding the entire circumferential side wall of the current collecting main body.
2. The current collector plate according to claim 1, characterized in that, The end of the insulating member in the axial direction of the current collecting main body is bent inward to form a flanging portion covering a part of the first connection portion and / or a part of the second connection portion.
3. The current collector plate according to claim 2, wherein, The flanging portion is formed into a closed annular structure.
4. The current collector tray according to claim 2, characterized in that, The height dimension of the flanging portion in the axial direction of the current collecting main body is a, where a = 0.06 mm to 0.1 mm.
5. The current collector tray according to claim 2, characterized in that The dimension of the flanging portion in the radial direction of the current collecting main body is b, where b = 2 mm to 3 mm.
6. The current collector tray according to claim 2, characterized in that The axial cross section of the flanging portion is a concave structure with two grooves facing each other.
7. The current collector plate according to claim 1, characterized in that, In the axial direction of the current collecting main body, the first connection portion and the second connection portion are arranged opposite to each other.
8. The current collector plate according to claim 1, characterized in that, The first connection portion is formed with a protruding convex portion, and the convex portion is welded to the pole column.
9. A battery cell, characterized in that, Including the current collecting plate according to any one of claims 1 to 8.
10. A battery pack, characterized in that, Including the battery cell according to claim 9.