Pole piece and battery
By setting spaced rectangular openings and current collector through holes on the active material layer of the electrode, the problems of poor mechanical strength of the electrode and excessively large electrode tab area are solved, achieving higher mechanical strength and welding stability, and improving battery performance.
Patent Information
- Application Number
- CN202423303801.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing wound lithium-ion battery electrodes have poor mechanical strength and excessively large tab area, which makes the electrodes prone to breakage and difficult to clean during winding.
Design an electrode structure in which the active material layer has rectangular first and second openings spaced apart for connecting the electrode tabs, and replaces the traditional electrode tab groove with a through hole on the current collector to avoid punching notches and reduce the cleaning area.
This improves the mechanical strength and welding stability of the electrode sheets, reduces the cleaning area of the tab grooves, and enhances the battery's performance.
Smart Images
Figure CN223884403U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a battery technical field, specifically, relates to a pole piece and battery. BACKGROUND
[0002] The existing winding type lithium ion battery tab center pole piece structure usually has a punching notch at the position corresponding to the tab slot, and the existence of the notch reduces the mechanical strength of the pole piece, which makes the pole piece easy to break during winding, especially the narrow pole piece. At the same time, the existing battery pole piece also has the problem of excessive tab slot area, which leads to excessive tab slot cleaning area of the pole piece.
[0003] Therefore, the existing technology has the problem of poor performance of the battery pole piece. UTILITY MODEL CONTENTS
[0004] The main purpose of the utility model is to provide a pole piece and battery to solve the problem of poor performance of the battery pole piece in the prior art.
[0005] In order to achieve the above purpose, according to one aspect of the utility model, a pole piece is provided, which comprises a current collector, the surface of at least one side of the current collector in the thickness direction has an active material layer, the active material layer has a first opening and a second opening, the first opening and the second opening are arranged at intervals along the width direction of the active material layer, and the side of the first opening away from the second opening is communicated with the edge of the length direction of the active material layer, and the first opening and the second opening are both used for connecting the tab.
[0006] Further, the first opening and the second opening are both rectangular, and the opening area of the first opening and the opening area of the second opening are both greater than the area between the first opening and the second opening.
[0007] Further, the two sides of the length direction of the active material layer are respectively a first side and a second side, the side of the first opening away from the second opening is communicated with the first side, and the distance from the side of the second opening away from the first opening to the second side is greater than the distance from the side of the second opening close to the first opening to the first opening.
[0008] Further, the length of the first opening and the length of the second opening are the same.
[0009] Further, the active material layer also has a third opening, the third opening is arranged between the first opening and the second opening, and the third opening is communicated with the first opening and the second opening respectively.
[0010] Further, the length of the third opening is less than the length of the first opening and / or the length of the second opening.
[0011] Further, in the width direction of the active material layer, the center line of the first opening, the center line of the second opening, and the center line of the third opening coincide.
[0012] Further, the current collector is provided with a through hole corresponding to the third opening, and an area of the through hole is smaller than an area of the third opening.
[0013] Further, a center of the through hole coincides with a center of the third opening.
[0014] According to another aspect of the present application, a battery is provided, comprising the above-mentioned tab.
[0015] According to the technical scheme of the present application, the tab in the present application comprises a current collector, a surface of at least one side of the current collector in the thickness direction is provided with an active material layer, the active material layer is provided with a first opening and a second opening, the first opening and the second opening are arranged at intervals along the width direction of the active material layer, in the width direction of the active material layer, a side of the first opening away from the second opening is in communication with an edge of the active material layer in the length direction, and the first opening and the second opening are both used for connecting a tab.
[0016] When the tab in the present application is used, since the active material layer on the current collector is provided with the first opening and the second opening, the tab can provide a welding space for the tab through the first opening and the second opening. Meanwhile, since the side of the first opening away from the second opening is in communication with the edge of the active material layer in the length direction, that is, the first opening is in communication with the side edge of the side of the active material layer in the length direction, compared with the notch at which the tab in the prior art is punched, the tab in the present application no longer needs to be punched to be welded with the tab, so that the mechanical strength of the tab is ensured. Meanwhile, since the first opening and the second opening arranged at intervals replace the tab slot of the tab in the prior art, the active material layer between the first opening and the second opening in the present application does not need to be cleaned, so that the cleaning area of the tab slot is reduced. Therefore, the tab in the present application effectively solves the problem of poor use performance of the battery tab in the prior art. BRIEF DESCRIPTION OF DRAWINGS
[0017] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:
[0018] Figure 1 Fig. 1 shows a structure schematic diagram of a tab in one specific embodiment of the present application;
[0019] Figure 2 Fig. 2 shows a structure schematic diagram of a tab in another specific embodiment of the present application;
[0020] Figure 3 Fig. 3 shows a structure schematic diagram of a tab in another specific embodiment of the present application;Figure 2 Fig. 2 is a structural schematic diagram of the pole piece with a through hole in Fig. 1;
[0021] Figure 4 Fig. 3 is a structural schematic diagram of a pole piece mother plate in one specific embodiment of the present application.
[0022] In the above drawings, the following reference signs are used:
[0023] 10, active material layer; 11, first opening; 12, second opening; 13, third opening; 20, through hole; 30, pole piece mother plate; 31, first cutting line; 32, second cutting line. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.
[0025] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.
[0026] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the various embodiments described herein are not limiting. It should be understood that the various parts shown in the drawings are not necessarily drawn to scale in proportion. The technology, methods and devices known to those skilled in the relevant art can not be discussed in detail, but should be considered as part of the authorized specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference signs and letters represent similar items in the following drawings, so that once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0027] In order to solve the problem of poor performance of the battery pole piece in the prior art, the application provides a pole piece and a battery.
[0028] In addition, the battery in the application has the pole piece in the following embodiments.
[0029] As shown in Figures 1 to 3 The pole piece in the application includes a current collector, at least one side of the current collector in the thickness direction has an active material layer 10, the active material layer 10 has a first opening 11 and a second opening 12, the first opening 11 and the second opening 12 are arranged at intervals along the width direction of the active material layer 10, in the width direction of the active material layer 10, the side of the first opening 11 away from the second opening 12 is communicated with the edge of the length direction of the active material layer 10, and the first opening 11 and the second opening 12 are both used to connect the tab.
[0030] When the pole piece in the application is used, because the active material layer 10 on the current collector has the first opening 11 and the second opening 12, the welding space for the tab can be provided through the first opening 11 and the second opening 12. At the same time, because the side of the first opening 11 away from the second opening 12 is communicated with the edge of the length direction of the active material layer 10, that is, the first opening 11 is communicated with the side edge of the side of the length direction of the active material layer 10, compared with the notch at the punching of the pole piece in the prior art, the pole piece in the application no longer needs to be punched to be welded with the tab, thereby ensuring the mechanical strength of the pole piece. At the same time, because the first opening 11 and the second opening 12 arranged at intervals replace the tab slot of the pole piece in the prior art, the active material layer 10 between the first opening 11 and the second opening 12 in the application does not need to be cleaned, thereby reducing the cleaning area of the tab slot. Therefore, the pole piece in the application effectively solves the problem of poor performance of the battery pole piece in the prior art.
[0031] In addition, as shown in Figure 4As shown, when the pole piece in the present application is prepared using the pole piece mother plate 30 in the present application, the first openings 11 and the second openings 12 arranged at intervals in groups can be washed along the first direction of the pole piece mother plate 30, or in other words, one second opening 12 is arranged between two adjacent first openings 11, that is, a plurality of first openings 11 and a plurality of second openings 12 are arranged on the pole piece mother plate 30, the number of the first openings 11 and the second openings 12 is equal and one-to-one corresponding, and the corresponding first openings 11 and second openings 12 are divided into a group. At the same time, a plurality of groups of first tangents 31 and second tangents 32 extending along the second direction are arranged on the pole piece mother plate 30, the first tangents 31 and the second tangents 32 are arranged at intervals, and the first direction and the second direction are perpendicular to each other, the first direction is parallel to the width direction of the first opening 11, the second direction is parallel to the length direction of the first opening 11, and the first tangent 31 passes through the first opening 11. Further, the distance from the first tangent 31 to the end of the first opening 11 close to the second opening 12 of the same group is greater than the distance from the first tangent 31 to the end of the first opening 11 away from the second opening 12 of the same group. And the number of the plurality of groups of first tangents 31 and the plurality of groups of second tangents 32 is equal to and one-to-one corresponding to the number of the plurality of groups of first openings 11 and the plurality of groups of second openings 12. In the cutting process, the first tangent 31 is cut first, at this time, the lower end of the pole piece, that is, the end of the second opening 12 away from the first opening 11, has a part of the first opening 11 region of the adjacent another pole piece, and then the second tangent 32 is cut, thereby cutting off the part of the pole piece having the part of the first opening 11 region of the another pole piece, thereby obtaining the final pole piece, at this time, the obtained pole piece does not need to be punched to form a notch. And, it needs to be noted that, since the first opening 11 on the pole piece mother plate 30 needs to be cut by the first tangent 31, the opening area of the first opening 11 on the pole piece mother plate 30 is different from the opening area of the first opening 11 of the finally formed pole piece, or in other words, the first opening 11 of the pole piece in the present application is obtained after the first opening 11 on the pole piece mother plate 30 is cut along the first tangent 31.
[0032] Specifically, the first opening 11 and the second opening 12 are both rectangular, and the opening area of the first opening 11 and the opening area of the second opening 12 are both greater than the area between the first opening 11 and the second opening 12. By arranging rectangular openings, the space can be more effectively utilized, while ensuring the contact area of the tab and the pole piece, further improving the stability of welding and the performance of the battery.
[0033] Specifically, the two sides of the length direction of the active material layer 10 are respectively a first side and a second side, and the first side is formed by cutting the pole piece mother plate 30 through the first cutting line 31, and the second side is formed by cutting the pole piece mother plate 30 through the second cutting line 32. And after cutting the first cutting line 31, the side of the first opening 11 away from the second opening 12 is communicated with the first side, at this time, the punching gap is no longer needed, and the distance from the side of the second opening 12 away from the first opening 11 to the second side is greater than the distance from the side of the second opening 12 close to the first opening 11 to the first opening 11.
[0034] Optionally, the length of the first opening 11 and the length of the second opening 12 are the same. By setting in this way, the welding effect of the tab can be effectively guaranteed, and the stability of the tab after welding can be guaranteed.
[0035] Optionally, the active material layer 10 also has a third opening 13, the third opening 13 is arranged between the first opening 11 and the second opening 12, and the third opening 13 is communicated with the first opening 11 and the second opening 12 respectively. In an embodiment of the present application, in the width direction of the active material layer 10, the middle line of the first opening 11, the middle line of the second opening 12 and the middle line of the third opening 13 coincide. In this embodiment, the first opening 11, the second opening 12 and the third opening 13 form an I-shaped tab slot, so as to further guarantee the stability of the tab welding and the use performance of the tab.
[0036] Optionally, the length of the third opening 13 is less than the length of the first opening 11 and the length of the second opening 12.
[0037] Further optionally, the current collector is provided with a through hole 20 corresponding to the third opening 13, and the area of the through hole 20 is less than the area of the third opening 13. By setting in this way, the weight of the tab and the pole piece after welding can be effectively reduced.
[0038] Preferably, the center of the through hole 20 coincides with the center of the third opening 13.
[0039] From the above description, it can be seen that the embodiments of the present application realize the following technical effects:
[0040] 1. Effectively solve the problem of poor use performance of the battery pole piece in the prior art;
[0041] 2. Simple structure and stable performance.
[0042] In the description of the utility model, it is understood that the orientation words such as '' front, back, up, down, left, right '' '' horizontal, vertical, perpendicular, horizontal '' and '' top, bottom '' and the like indicated orientation or positional relationship is usually based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, in the absence of the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore can not be understood as the limitation of the protection scope of the utility model;The orientation words '' inside, outside '' refer to the inside and outside relative to the contour of each component.
[0043] For the convenience of description, spatial relative terms such as '' above'', '' above'', '' upper surface'', '' upper '' and the like can be used here to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawing. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawing. For example, if the device in the drawing is inverted, the device described as '' above '' or '' above '' other devices or structures will be positioned '' below '' or '' below '' other devices or structures. Thus, the exemplary term '' above '' can include both '' above '' and '' below '' orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used here is interpreted accordingly.
[0044] In addition, it should be noted that the use of '' first'', '' second '' and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore can not be understood as the limitation of the protection scope of the utility model.
[0045] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, for those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.
Claims
1. A pole piece, characterized in that, The current collector has a surface on at least one side in the thickness direction thereof, and the surface has an active material layer (10), The active material layer (10) has a first opening (11) and a second opening (12) disposed apart from each other in a width direction of the active material layer (10), and the first opening (11) is in communication with an edge in a length direction of the active material layer (10) on a side away from the second opening (12) in the width direction of the active material layer (10), and the first opening (11) and the second opening (12) are both for connecting a tab.
2. The pole piece of claim 1, wherein The first opening (11) and the second opening (12) are both rectangular, and the opening area of the first opening (11) and the opening area of the second opening (12) are both greater than the area between the first opening (11) and the second opening (12).
3. The pole piece of claim 1, wherein The active material layer (10) has a first side edge and a second side edge in the length direction thereof, the first opening (11) is in communication with the first side edge on a side away from the second opening (12), and the distance from the second opening (12) on a side close to the first opening (11) to the first opening (11) is greater than the distance from the second opening (12) on a side away from the first opening (11) to the second side edge.
4. The pole piece of claim 1, wherein The length of the first opening (11) is the same as the length of the second opening (12).
5. The pole piece of any one of claims 1 to 4, wherein, The active material layer (10) further has a third opening (13) disposed between the first opening (11) and the second opening (12), and the third opening (13) is in communication with the first opening (11) and the second opening (12), respectively.
6. The pole piece of claim 5, wherein The length of the third opening (13) is less than the length of the first opening (11) and / or the length of the second opening (12).
7. The pole piece of claim 5, wherein In the width direction of the active material layer (10), the center line of the first opening (11), the center line of the second opening (12), and the center line of the third opening (13) coincide.
8. The pole piece of claim 5, wherein, The current collector has a through hole (20) corresponding to the third opening (13), and the area of the through hole (20) is less than the area of the third opening (13).
9. The pole piece of claim 8, wherein, The center of the through hole (20) coincides with the center of the third opening (13).
10. A battery, characterized by The tab includes the tab as claimed in any one of claims 1 to 9.