Pole group structure and battery
By structuring the battery's ear components as divided segments, the design addresses the challenges of wide ear bending difficulties, ensuring proper alignment and reducing tears and short circuits, enhancing manufacturing efficiency and safety.
Patent Information
- Application Number
- CN202422219842.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-10
AI Technical Summary
Under the same foil thickness and number of layers, the increase in the width of the pole ear makes it difficult to bending, which is prone to problems such as tearing of the pole ear, overlapping short circuit between the pole ear and the shell, and short circuit inside the battery cell.
The electrode ear is designed as an ear assembly, including a plurality of ear portions arranged at intervals in the second direction, and the positive ear and the negative ear are bent through their respective ear portions to fit with the inner side of the battery cover plate, forming the ear assembly in the first and second directions of the intersection.
Effectively reduce the difficulty of bending the extreme ear, avoid tearing and short circuit of the extreme ear, improve current delivery capabilities, and ensure battery cell safety.
Smart Images
Figure CN223109173U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of batteries, and in particular to a pole group structure and a battery. Background Art
[0002] Lithium-ion batteries are widely used in various fields such as transportation power sources, power energy storage power sources, new energy storage power sources, aerospace and military industries due to their advantages such as large capacity, high working voltage, strong charge retention ability, and long cycle life.
[0003] With the continuous improvement of the requirements for battery capacity, charge and discharge rate, fast charging, etc., the demand for large current overcurrent of the battery is continuously increasing, which makes the requirement for the width of the tab wider under the conditions of the same foil thickness and number of layers. However, this greatly increases the bending difficulty of the tab in the battery cell manufacturing process, and various problems such as tab tearing, tab short-circuiting with the housing due to improper tab bending, and the tab collapsing and inversely inserting into the pole group resulting in internal short-circuit of the battery cell often occur, causing great trouble to production. Utility Model Content
[0004] The purpose of this application is to provide a pole group structure and a battery, so as to solve to a certain extent the technical problems existing in the prior art that under the conditions of the same foil thickness and number of layers, the requirement for the width of the tab is wider, which greatly increases the bending difficulty of the tab, and various problems such as tab tearing, tab short-circuiting with the housing due to improper tab bending, and the tab collapsing and inversely inserting into the pole group resulting in internal short-circuit of the battery cell often occur, causing great trouble to production.
[0005] According to a first aspect of this application, a pole group structure for a battery is provided. The battery includes the pole group structure and a battery cover plate that are electrically connected to each other. The pole group structure includes a positive tab, a negative tab, and a pole group body. Both the positive tab and the negative tab are led out from the end of the pole group body in a first direction.
[0006] Both the positive tab and the negative tab are tab assemblies. The tab assembly includes a plurality of sub-tabs arranged at intervals in a second direction. Both the positive tab and the negative tab are bent through their respective sub-tabs to fit the inner side of the battery cover plate. The first direction intersects the second direction.
[0007] Preferably, the positive tab and the negative tab are respectively led out from both ends of the pole group body in the first direction.
[0008] Preferably, both the positive tab and the negative tab are led out from the same side of the pole group body in the first direction.
[0009] Preferably, the total length of the tab assembly in the second direction is 80 mm to 120 mm.
[0010] Preferably, the dimension of the ear - dividing part in the second direction is 30 mm to 60 mm.
[0011] Preferably, within the same tab assembly, the distance between two adjacent ear - dividing parts in the second direction is greater than 3 mm.
[0012] Preferably, each ear - dividing part included in the tab assembly is directly led out from the electrode group body.
[0013] Preferably, the number of ear - dividing parts included in the tab assembly is 2 to 4.
[0014] According to a second aspect of the present application, a battery is provided, which includes the above - mentioned battery cover plate and the electrode group structure described in any of the above technical solutions. Therefore, it has all the beneficial technical effects of this electrode group structure and will not be elaborated herein.
[0015] Preferably, the battery cover plate includes a plate body and a terminal post assembly, and the tab assembly is electrically connected to the battery cover plate via the terminal post assembly;
[0016] The terminal post assembly includes a riveting block extending along the second direction and a plurality of terminal post rivets. The plurality of terminal post rivets are arranged at intervals along the second direction, and the terminal post rivets penetrate through the plate body and are riveted to the riveting block. Each ear - dividing part has at least one terminal post rivet connected thereto.
[0017] Compared with the prior art, the beneficial effects of the present application are as follows:
[0018] In the electrode group structure provided by the present application, by setting both the positive tab and the negative tab of the electrode group structure as the structure of the tab assembly, that is, setting a plurality of ear - dividing parts arranged at intervals along the second direction, and making the positive tab and the negative tab bend via their respective ear - dividing parts. In this way, not only the widths of the positive tab and the negative tab are taken into account to ensure the current - carrying capacity of both the positive tab and the negative tab, but also the wide tab is divided into a plurality of ear - dividing parts, which effectively facilitates the bending of the tab and avoids problems such as tab tearing during the bending process, short - circuit between the tab and the housing due to the tab overlapping, and internal short - circuit of the battery cell caused by the tab collapsing and inserting into the electrode group due to the excessive width of the tab.
[0019] To make the above - mentioned objects, features, and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, detailed descriptions are as follows. Description of the Drawings
[0020] To more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0021] Figure 1 Axonometric structural schematic diagram of the battery provided by the embodiment of the present application;
[0022] Figure 2 Another axonometric structural schematic diagram of the battery provided by the embodiment of the present application;
[0023] Figure 3 Front view structural schematic diagram of the pole group structure provided by the embodiment of the present application.
[0024] Reference numerals:
[0025] 10 - tab assembly; 100 - split ear part; 11 - pole group body; 21 - riveting block; 22 - pole post rivet; 3 - battery cover plate.
[0026] F1 - first direction; F2 - second direction; F3 - third direction. Specific embodiments
[0027] The following will clearly and completely describe the technical solutions of the present application with reference to the drawings. Obviously, the described embodiments are some embodiments of the present application, rather than all embodiments.
[0028] Generally, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.
[0029] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.
[0030] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0031] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0032] The following refers to Figures 1 to 3 Describe the pole group structure and battery according to some embodiments of the present application.
[0033] See Figures 1 to 3 As shown, an embodiment of the first aspect of the present application provides a pole group structure for a battery. The battery includes a pole group structure and a battery cover plate 3. The pole group structure includes a positive electrode tab, a negative electrode tab, and a pole group body 11. Both the positive electrode tab and the negative electrode tab are led out from the end of the pole group body 11 in the first direction F1. Both the positive electrode tab and the negative electrode tab are pole tab assemblies 10. Among them, the pole tab assembly 10 includes a plurality of sub-tabs 100 arranged at intervals in the second direction F2. Both the positive electrode tab and the negative electrode tab are bent through their respective sub-tabs 100 to fit the inner side of the battery cover plate 3, and the first direction F1 intersects the second direction F2.
[0034] According to the pole group structure provided by the above technical features, by setting both the positive electrode tab and the negative electrode tab of the pole group structure as the structure of the pole tab assembly 10, that is, setting a plurality of sub-tabs 100 arranged at intervals in the second direction F2, and making the positive electrode tab and the negative electrode tab bend through their respective sub-tabs 100. In this way, not only the widths of the positive electrode tab and the negative electrode tab are taken into account to ensure the current-carrying capacity of both the positive electrode tab and the negative electrode tab, but also the wide pole tab is divided into a plurality of sub-tabs 100, which effectively facilitates the bending of the pole tab and avoids problems such as pole tab tearing, pole tab short-circuiting with the housing due to the excessive width of the pole tab, and the pole tab collapsing and being inserted into the pole group, resulting in internal short-circuit of the battery cell.
[0035] As Figures 1 to 3As shown, F1 shown in the figure can be an example of the above-mentioned first direction F1, and F2 shown in the figure can be an example of the above-mentioned second direction F2. For the convenience of description, the direction perpendicular to the plane determined by both the first direction F1 and the second direction F2 is defined as the third direction F3, and F3 shown in the figure can be an example of this third direction F3. Taking the above-mentioned pole group structure adapted to a square shell battery as an example, preferably, the above-mentioned first direction F1 can be parallel to the length direction of the square shell battery, the above-mentioned second direction F2 can be parallel to the width direction of the square shell battery, and the above-mentioned third direction F3 can be parallel to the thickness direction of the square shell battery. However, it is not limited thereto, and the first direction F1, the second direction F2, and the third direction F3 can be adaptively adjusted according to the position where the tab is led out.
[0036] Hereinafter, taking Figure 1 and Figure 2 as examples, where the positive tab and the negative tab shown are respectively led out from both ends of the pole group body 11 in the first direction F1, the pole group structure provided by the present application will be specifically described. Figure 1 and Figure 2 show the structure of the battery on the side where the positive tab is located.
[0037] However, it is not limited thereto. Not shown in the figure, both the above-mentioned positive tab and negative tab are led out from the same side of the pole group body 11 in the first direction F1.
[0038] Preferably, as Figure 3 shown, the total length of the above-mentioned tab assembly 10 in the second direction F2 (i.e., the W value shown in the figure) can be 80 mm to 120 mm (for example, w can be equal to 80 mm, 85 mm, 90 mm, 95 mm, 100 mm, 105 mm, 110 mm, 115 mm, 120 mm, etc.). In this way, the tab assembly 10 can not only adapt to the size of the battery cover plate 3, but also meet the current delivery capacity of the battery.
[0039] Preferably, as Figure 3 shown, the size of the above-mentioned tab splitting part 100 in the second direction F2 (i.e., W1 and W2 shown in the figure) can be 30 mm to 60 mm (for example, W1 and W2 can be equal to 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, etc.), so as to balance the bending ability of the tab splitting part 100 and the assembly convenience of the battery.
[0040] Preferably, in the same tab assembly 10, the sizes of multiple tab splitting parts 100 in the second direction F2 are equal to ensure the size consistency of each tab splitting part 100, and further facilitate the processing and assembly of the tab splitting part 100. That is, taking the pole group structure shown in Figure 3 as an example, W1 = W2.
[0041] Preferably, asFigure 3 As shown, within the same tab assembly 10, the dimension of the spacing between two adjacent sub-tab portions 100 in the second direction F2 (i.e., Figure 3 the g value shown) is greater than 3 mm to prevent interference between the sub-tab portions 100 during the bending process. Among them, taking the Figure 3 shown pole group structure as an example, g = W - (W1 + W2).
[0042] Preferably, as Figures 1 to 3 shown, each sub-tab portion 100 included in the above tab assembly 10 directly extends from the pole group body 11, thereby improving the bending flexibility of each sub-tab portion 100 and further reducing the risk of the tab being torn.
[0043] However, it is not limited to this. Optionally, not shown in the figure, the above tab assembly 10 may further include a connecting portion. The same tab assembly 10 includes at least one connecting portion, and a plurality of sub-tab portions 100 are provided on each connecting portion, and the sub-tab portions 100 extend from the pole group body 11 via the connecting portion.
[0044] As Figures 1 to 3 shown, an example where the positive tab includes two sub-tab portions 100 is shown. However, it is not limited to this. The number of sub-tab portions 100 included in each tab assembly 10 may also be 3, 4, or 5.
[0045] An embodiment of the second aspect of the present application further provides a battery, including the above battery cover plate 3 and the pole group structure described in any of the above embodiments. Therefore, it has all the beneficial technical effects of this pole group structure, and will not be elaborated here.
[0046] Preferably, as Figure 1 and Figure 2 shown, the above battery cover plate 3 may include a plate body and a pole column assembly, and the tab assembly 10 is electrically connected to the battery cover plate 3 via the pole column assembly.
[0047] Preferably, as Figure 1 and Figure 2 shown, the pole column assembly may include a riveting block 21 extending in the second direction F2 and a plurality of pole column rivets 22. The plurality of pole column rivets 22 are spaced along the second direction F2, and the pole column rivets 22 penetrate the plate body and are riveted to the riveting block 21. Each sub-tab portion 100 has at least one pole column rivet 22 connected thereto, so as to facilitate the independent connection between the sub-tab portion 100 and the pole column.
[0048] Optionally, not shown in the figure, the above battery may further include a housing. The above battery cover plate 3 may be covered on the end portion of the housing in the first direction F1, and the above pole column assembly is disposed in the closed space surrounded by the housing and the battery cover plate 3.
[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; 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 they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A pole group structure, characterized in that, For a battery, the battery includes the pole group structure and a battery cover plate that are electrically connected to each other. The pole group structure includes a positive pole tab, a negative pole tab, and a pole group body. Both the positive pole tab and the negative pole tab are led out from the end of the pole group body in a first direction. Both the positive pole tab and the negative pole tab are pole tab assemblies. The pole tab assembly includes a plurality of sub-ear parts spaced along a second direction. Both the positive pole tab and the negative pole tab are bent via their respective sub-ear parts to fit against the inner side of the battery cover plate. The first direction intersects the second direction.
2. The electrode group structure according to claim 1, wherein The positive pole tab and the negative pole tab are respectively led out from both ends of the pole group body in the first direction.
3. The electrode group structure according to claim 1, characterized in that, Both the positive pole tab and the negative pole tab are led out from the same side of the pole group body in the first direction.
4. The electrode group structure according to any one of claims 1 to 3, characterized in that, The total length of the pole tab assembly in the second direction is 80 mm to 120 mm.
5. The electrode group structure according to any one of claims 1 to 3, characterized in that, The dimension of the sub-ear part in the second direction is 30 mm to 60 mm.
6. The electrode group structure according to any one of claims 1 to 3, characterized in that, Within the same pole tab assembly, the distance between two adjacent sub-ear parts in the second direction is greater than 3 mm.
7. The electrode group structure according to claim 1, characterized in that Each sub-ear part included in the pole tab assembly is directly led out from the pole group body.
8. The electrode group structure according to claim 1, characterized in that, The number of sub-ear parts included in the pole tab assembly is 2 to 4.
9. A battery, characterized in that, Including the battery cover plate and the pole group structure according to any one of claims 1 to 8.
10. The battery according to claim 9, characterized in that, The battery cover plate includes a plate body and a pole column assembly. The pole tab assembly is electrically connected to the battery cover plate via the pole column assembly. The pole column assembly includes a riveting block extending along the second direction and a plurality of pole column rivets. The plurality of pole column rivets are spaced along the second direction, and the pole column rivets penetrate the plate body and are riveted to the riveting block. Each sub-ear part has at least one pole column rivet connected thereto.