Battery pole piece
By designing multiple cutouts on the ear of the battery pole plate and setting intersecting cutout structures, the problem of the ear bend or crescent moon is solved, and a more stable ear structure and higher battery quality are achieved.
Patent Information
- Application Number
- CN202420502548.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-14
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-03-14
AI Technical Summary
The existing secondary battery pole plates are prone to cause the ear bend or ear crescent during the production process, resulting in quality problems such as inverted ear insertion, poor short circuit or poor self-discharge during the manufacturing process of the battery cell.
A battery pole piece is designed, with the pole ear having multiple cutouts, the cutouts running through the thickness direction of the pole ear, and at least two cutouts intersect. This structure reduces stress concentration and relieves stress release, thereby avoiding bending or crescent sensation of the extreme ear.
It effectively solves the problem of the secondary battery pole plate bend or crescent during the production process, improves the stability of the pole ear, reduces the risk of short circuit and poor self-discharge, and ensures battery quality.
Smart Images
Figure CN222530755U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery pole piece. Background Art
[0002] The electrode in a secondary battery generally mixes electrochemically active substances, conductive agents, adhesives, solvents and other materials into a slurry, which is then coated on the electrode substrate material of aluminum foil or copper foil by inkjet, extrusion, printing transfer, etc., and then solidified by baking, and then compacted by roller pressing, and finally cut according to the electrode size required for battery production.
[0003] The existing pole pieces are prone to tab bending or tab crescents during the roller process. Such tab bending or crescents can easily lead to inverted tab insertion during the manufacturing process of the battery cell, causing quality accidents. Secondly, the tab crescents are prone to short circuits or self-discharge during operation.
[0004] Therefore, in the prior art, there is a problem that the secondary battery pole piece is prone to bending or crescent of the pole tab during the production process. Utility Model Content
[0005] The main purpose of the utility model is to provide a battery pole piece to solve the problem in the prior art that the secondary battery pole piece is prone to bending or crescent of the pole ear during the production process.
[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery pole piece is provided, comprising: a pole piece body; at least one pole ear, at least one pole ear is arranged on at least one side of the pole piece body, and each pole ear has a plurality of incisions, the incisions penetrate the pole ear along the thickness direction of the pole ear, and at least two of the plurality of incisions intersect.
[0007] Furthermore, all the cutouts include at least one first cutout and at least one second cutout, the first cutouts extend along the height direction of the tab, and each first cutout intersects with at least one second cutout.
[0008] Furthermore, the angle between the intersecting second incision and the first incision is not less than 60 degrees and less than or equal to 90 degrees.
[0009] Furthermore, there is one first incision and two second incisions, the two second incisions are respectively located on both sides of the first incision, and one end of the two second incisions intersects with one end of the first incision close to the pole piece body.
[0010] Furthermore, the pole ear has a first end connected to the pole piece body and a second end arranged opposite to the first end, one end of the first incision extends to the first end of the pole ear, and the other end of the first incision extends to the second end of the pole ear or is spaced apart from the second end of the pole ear.
[0011] Furthermore, the pole ear has a first end, a third end, a second end and a fourth end connected end to end in sequence, wherein the first end of the pole ear is connected to the pole piece body, and the two ends of the second incision are respectively spaced apart from the third end and the fourth end of the pole ear.
[0012] Furthermore, at least one through hole is provided on the pole lug, each through hole is communicated with an end of a cutout, and the through hole is arranged tangent to a boundary line between the pole lug and the pole piece body.
[0013] Furthermore, at least one through hole is provided on the pole ear, the through hole is provided at an end of the second incision away from the first incision, and the through hole is provided tangent to a boundary line between the pole ear and the pole piece body.
[0014] Furthermore, there is one first incision, two through holes and two second incisions, and the radii of the two through holes are the same. One end of the second incision intersects with the first incision, and the distances from the two intersection points of the line connecting the centers of the two through holes and the edge of the pole ear to the center of the adjacent through hole are L1 and L2 respectively, then 0.25≤L1 / L2≤0.5.
[0015] Furthermore, a numerical ratio of a distance L3 from one end of the second incision away from the first incision to the first incision and a width L4 of the pole ear corresponding to the one end of the second incision away from the first incision is greater than or equal to 0.25 and less than or equal to 0.45.
[0016] Applying the technical solution of the utility model, the battery pole piece in the present application includes a pole piece body and at least one pole ear, the pole ear is arranged on at least one side of the pole piece body, and the pole ear has at least two cuts, and at least two cuts intersect. Since the pole ear of the battery pole piece in the present application has at least two cuts, stress concentration can be reduced by the cuts, so that stress release can be better relieved and wrinkles can be avoided in the production process of the pole piece, and since the cuts 21 are arranged to intersect, that is, there are cuts in different directions, stress release can be relieved from different directions, achieving a better effect of reducing stress concentration. Therefore, by using the battery pole piece in the present application, the problem of the secondary battery pole piece in the prior art that the pole ear is prone to bending or the pole ear crescent during the production process is effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:
[0018] Figure 1 A schematic diagram showing the structure of a battery pole piece of a specific embodiment of the present application is shown;
[0019] Figure 2 A schematic diagram showing the structure of a battery pole piece in another specific embodiment of the present application is shown;
[0020] Figure 3 A schematic structural diagram of a battery electrode sheet according to another specific embodiment of the present application is shown.
[0021] The above drawings include the following reference numerals:
[0022] 10. Pole piece body; 20. Pole ear; 21. Incision; 211. First incision; 212. Second incision; 30. Through hole. DETAILED DESCRIPTION
[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.
[0025] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.
[0026] A battery pole piece is provided to solve the problem in the prior art that secondary battery pole pieces are prone to bending or pole ear crescents during the production process.
[0027] like Figures 1 to 3 As shown, the battery electrode in the present application includes an electrode body 10 and at least one electrode ear 20, at least one electrode ear 20 is arranged on at least one side of the electrode body 10, and the electrode ear 20 has a plurality of cutouts 21, the cutouts 21 penetrate the electrode ear 20 along the thickness direction of the electrode ear 20, and at least two of the plurality of cutouts 21 intersect. Figure 1The front-to-back direction. Since the pole piece 20 of the battery pole piece in the present application has a plurality of cutouts 21, the stress concentration can be reduced by the cutouts 21, so that the stress release can be better relieved and the pole piece 20 can be prevented from wrinkling during the production process. Moreover, since the cutouts 21 are arranged to intersect, that is, the cutouts 21 have different directions, the stress release can be better relieved, thereby achieving a better effect of reducing stress concentration. Therefore, the use of the battery pole piece in the present application effectively solves the problem of the secondary battery pole piece in the prior art being prone to bending of the pole piece or crescent of the pole piece during the production process. It should be noted that in the present application, the structure of the pole piece 20 is mainly improved to reduce the stress concentration of the pole piece 20.
[0028] Optionally, there are multiple pole tabs 20, and the multiple pole tabs 20 are arranged at intervals on the same side of the pole piece body 10, and the multiple pole tabs 20 have the same structure; multiple pole tabs can also be arranged on opposite sides of the pole piece body 10. And, it should be added that in the present application, the specific number of pole tabs 20 can be adaptively adjusted according to each actual usage situation.
[0029] Specifically, all the cutouts 21 include at least one first cutout 211 and at least one second cutout 212. The first cutout 211 is formed along the height direction of the tab 20 (i.e., Figure 1 The first notch 211 extends in the vertical direction of the tab 20, and each first notch 211 intersects with at least one second notch 212. This arrangement can further reduce the stress concentration of the tab 20. It is particularly noted that the extension directions of different second notches 212 can be parallel or non-parallel, and the lengths of different second notches 212 can be the same or different, and the adaptive design is specifically performed according to the setting position of the second notch in the tab 20 and the size of the tab.
[0030] Optionally, the angle between the second cutout 212 and the first cutout 211 is not less than 60 degrees and less than or equal to 90 degrees. By setting the angle between the second cutout 212 and the first cutout 211, a better stress relief effect can be achieved.
[0031] Specifically, there is one first incision 211 and two second incisions 212, and the two second incisions 212 are respectively located on both sides of the first incision 211, and one end of the two second incisions 212 intersects with one end of the first incision 211 close to the pole piece body 10. Providing one first incision 211 and two second incisions 212 can ensure that the stress release of the pole ear 20 is more complete, and since the stress concentration point is usually located on the side of the pole ear 20 close to the pole piece body 10, one end of the two second incisions 212 is set to intersect with one end of the first incision 211 close to the pole piece body 10, which can achieve a better effect of reducing the stress concentration of the pole ear 20.
[0032] In such Figure 1 In the embodiment shown, the first cutout 211 is arranged along the height direction of the pole lug, the two second cutouts 212 are perpendicular to the first cutout 211 (i.e., the included angle is 90 degrees), and the two second cutouts 212 intersect with one end of the first cutout 211 close to the pole piece body 10. Figure 3 In the illustrated embodiment, the first cutout 211 is arranged along the height direction of the pole ear, and the angle between the two second cutouts 212 and the first cutout 211 is not less than 60 degrees and less than 90 degrees, and the two second cutouts 212 intersect with one end of the first cutout 211 close to the pole piece body 10.
[0033] Optionally, the pole tab 20 has a first end connected to the pole piece body 10 and a second end disposed opposite to the first end, one end of the first cutout 211 extends to the first end of the pole tab 20, and the other end of the first cutout 211 extends to the second end of the pole tab 20 or is spaced apart from the second end of the pole tab 20. Figure 2 and Figure 3 As shown, the first cutout 211 is connected to the first end of the pole tab 20 and the pole piece body 10. Furthermore, the other end of the first cutout 211 is spaced from the second end of the pole tab 20 and can also extend to the second end of the pole tab 20. When the other end of the first cutout 211 extends to the second end of the pole tab 20, it is equivalent to dividing the pole tab into two sub-tabs, which indirectly reduces the width of the pole tab and can reduce the generation of the pole tab crescent. Of course, it can also be as Figure 1 As shown, the first cutout 211 is spaced apart from the first end where the pole ear 20 and the pole piece body 10 are connected.
[0034] Optionally, the pole lug 20 has a first end, a third end, a second end and a fourth end connected in sequence, and both ends of the second incision 212 are spaced apart from the third end and the fourth end of the pole lug 20 , respectively, so as to avoid damage to the pole lug caused by the setting of the incision 21 .
[0035] Further preferably, at least one through hole 30 is provided on the pole lug 20, the through hole 30 is connected to the end of a cutout 21, and the through hole 30 is tangent to the boundary line between the pole lug 20 and the pole piece body 10. Since the stress concentration points are usually located at the root of the pole lug 20 (i.e., the end of the pole lug 20 close to the pole piece body 10), in the present application, by providing a through hole 30 tangent to the boundary line between the pole lug 20 and the pole piece body 10, the stress concentration points can be removed, or the generation of stress concentration points of the pole lug 20 can be reduced. Preferably, the aperture of the through hole 30 is greater than or equal to 0.05 mm and less than or equal to 1 mm. Of course, the aperture of the through hole 30 can also be adaptively adjusted according to actual usage. It is particularly noted that due to process errors, the tangency of the through hole 30 to the boundary line between the pole lug 20 and the pole piece body 10 does not necessarily meet the mathematical sense of being exactly tangent, and there may be certain deviations, which all belong to the scope of the present application.
[0036] Optionally, the through hole 30 is arranged at an end of the second cutout 212 away from the first cutout 211. This arrangement can ensure that the overall structure of the tab 20 is more stable and can better reduce stress concentration.
[0037] Alternatively, if Figure 1 As shown, there is one first incision 211, two through holes 30 and two second incisions 212, and the two through holes 30 have the same radius, one end of the second incision 212 intersects and connects with the first incision 211, and the distances from the two intersections of the line connecting the centers of the two through holes 30 and the edge of the pole ear 20 to the centers of the adjacent through holes 30 are L1 and L2, respectively, then 0.25≤L1 / L2≤0.5, that is, L1 is the distance between an intersection and the center of the through hole 30 adjacent to the intersection, and L2 is the distance between another intersection and the center of the through hole 30 adjacent to the intersection. When rolling the pole piece, the side with a distance of L1 can be rolled first. Since the pole ear 20 will be subjected to greater stress when it is just put into the roller, the through hole 30 on the side where the pole ear 20 passes the roller first is set to be closer to the side end (i.e., the third end or the fourth end) of the pole ear 20, so that the stress release can be better alleviated. At the same time, the difference between L1 and L2 cannot be too large to ensure that the overall structure of the tab 20 is more stable.
[0038] In a specific embodiment of the present application, the ratio of the distance L3 from the end of the second incision 212 away from the first incision 211 to the first incision 211 and the width L4 of the pole ear corresponding to the end of the second incision 212 away from the first incision 211 is greater than or equal to 0.25 and less than or equal to 0.45. Thus, while avoiding the second incision 212 from having a significant impact on the current performance of the pole ear 20, the effect of relieving stress release of the second incision 212 can be optimized. It is particularly noted that the width direction of the pole ear, i.e. Figure 2 The left and right direction in .
[0039] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:
[0040] 1. Effectively solve the problem that the secondary battery pole piece in the prior art is prone to bending or crescent of the pole ear during the production process;
[0041] 2. Simple structure and stable performance.
[0042] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
[0045] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A battery pole piece, characterized in that: include: Pole piece body(10); At least one pole lug (20), at least one pole lug (20) is arranged on at least one side of the pole piece body (10), and each pole lug (20) has a plurality of cutouts (21), the cutouts (21) penetrate the pole lug (20) along the thickness direction of the pole lug (20), and at least two of the plurality of cutouts (21) intersect.
2. The battery electrode according to claim 1, characterized in that: All of the cutouts (21) include at least one first cutout (211) and at least one second cutout (212), wherein the first cutout (211) extends along the height direction of the pole lug (20), and each of the first cutouts (211) intersects with at least one of the second cutouts (212).
3. The battery pole piece according to claim 2, characterized in that: The angle between the second incision (212) and the first incision (211) that intersect each other is not less than 60 degrees and less than or equal to 90 degrees.
4. The battery pole piece according to claim 2, characterized in that: There is one first incision (211) and two second incisions (212), the two second incisions (212) are respectively located on both sides of the first incision (211), and one end of the two second incisions (212) intersects with one end of the first incision (211) close to the pole piece body (10).
5. The battery pole piece according to claim 2, characterized in that: The pole lug (20) has a first end connected to the pole piece body (10) and a second end arranged opposite to the first end; one end of the first cutout (211) extends to the first end of the pole lug (20); and the other end of the first cutout (211) extends to the second end of the pole lug (20) or is spaced apart from the second end of the pole lug (20).
6. The battery pole piece according to claim 2, characterized in that: The pole lug (20) has a first end, a third end, a second end and a fourth end connected in sequence end to end, wherein the first end of the pole lug (20) is connected to the pole piece body (10), and the two ends of the second cutout (212) are respectively spaced apart from the third end and the fourth end of the pole lug (20).
7. The battery pole piece according to any one of claims 1 to 6, characterized in that: At least one through hole (30) is also provided on the pole lug (20), each of the through holes (30) is connected to an end of the cutout (21), and the through hole (30) is arranged tangent to a boundary line between the pole lug (20) and the pole piece body (10).
8. The battery pole piece according to any one of claims 2 to 6, characterized in that: At least one through hole (30) is also provided on the pole lug (20), and the through hole (30) is provided at an end of the second incision (212) away from the first incision (211), and the through hole (30) is tangent to a boundary line between the pole lug (20) and the pole piece body (10).
9. The battery pole piece according to claim 8, characterized in that: There is one first incision (211), two through holes (30) and two second incisions (212), and the two through holes (30) have the same radius. One end of the second incision (212) intersects with the first incision (211), and the distances from the two intersection points of the line connecting the centers of the two through holes (30) and the edge of the pole lug (20) to the center of the adjacent through hole (30) are L1 and L2, respectively, and 0.25≤L1 / L2≤0.
5.
10. The battery pole piece according to claim 4, characterized in that: The ratio of a distance L3 from one end of the second cutout (212) away from the first cutout (211) to the first cutout (211) to a width L4 of the pole ear corresponding to the one end of the second cutout (212) away from the first cutout (211) is greater than or equal to 0.25 and less than or equal to 0.45.