A battery pole piece and a battery cell having the same

Abstract

The utility model relates to battery technology field discloses a kind of battery pole piece and the electric core with the battery pole piece of this, the battery pole piece includes pole piece ontology;The pole piece ontology is equipped with embossed area, and the embossed area has a plurality of first embossing of interval arrangement, and adjacent two first embossing are communicated by several second embossing;The orthographic projection area of first embossing is greater than the orthographic projection area of second embossing;The depth of first embossing is H μm, and the depth of second embossing is h μm, satisfy: h The utility model provides battery pole piece is communicated adjacent two first embossing by second embossing, and limit the orthographic projection area relationship and depth relationship between first embossing and second embossing, improve the long-term cycle performance of battery, prolong battery life.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery electrode and a battery cell having the battery electrode. Background Technology

[0002] Currently, the industry commonly uses embossing on the surface of battery electrodes to improve electrolyte wetting ability, reduce lithium plating at corners, and thus improve battery cycle performance. Existing embossing structures consist of multiple concave circular embossings of the same depth and diameter, spaced apart. While this structure can increase the contact area between the electrolyte and the electrode to some extent, thus improving wetting ability, the lack of connectivity between the multiple embossings restricts electrolyte flow, leading to uneven electrolyte distribution within the battery electrodes. This can easily result in insufficient electrolyte in the corner areas of the cell. When there is insufficient electrolyte in the corner areas, the active materials in these areas cannot receive a sufficient supply of lithium ions, preventing them from fully participating in the electrochemical reaction. This significantly reduces the utilization rate of active materials. As time and the number of cycles increases, the electrolyte is gradually consumed, and this situation worsens, leading to a "cell plunge" phenomenon and affecting battery life. Utility Model Content

[0003] With the aim of at least solving one of the technical problems existing in the prior art, this utility model aims to provide a battery electrode and a battery cell having the battery electrode, wherein the battery electrode can improve the long-term cycle performance of the battery and extend the battery life.

[0004] To achieve the above objectives, this utility model provides a battery electrode sheet having a first direction, a second direction, and a third direction that are perpendicular to each other. The battery electrode sheet includes an electrode sheet body, and the electrode sheet body is provided with an embossed area. The embossed area has a plurality of spaced-apart first embossings, and adjacent two first embosseds are connected by a plurality of second embosseds. The first direction and the second direction intersect to form a reference plane. Along the third direction, the orthographic projection area of ​​the first embosseds on the reference plane is greater than the orthographic projection area of ​​the second embosseds on the reference plane. Along the third direction, the depth of the first embosseds is H μm, and the depth of the second embosseds is h μm, satisfying that h < H.

[0005] In some embodiments, along the third direction, the depth of the first embossing is H μm and the depth of the second embossing is h μm, satisfying: 1.5h ≤ H ≤ 2h.

[0006] In some implementations, 50μm≤hμm≤100μm.

[0007] In some embodiments, along the first direction, the size of the first embossing is B1mm and the size of the second embossing is B2mm; along the second direction, the size of the first embossing is D1mm and the size of the second embossing is D2mm, satisfying: 4mm≤B1mm≤8mm; 2mm≤B2mm≤4mm; 4mm≤D1mm≤8mm; 2mm≤D2≤4mm.

[0008] In some embodiments, the first embossed pattern is an N-sided polygon, and the second embossed pattern is an n-sided polygon; N ≥ 3 and N is an integer, and n ≥ 3 and n is an integer.

[0009] In some implementations, N = n.

[0010] In some embodiments, the shape of the first embossing is the same as the shape of the second embossing.

[0011] In some embodiments, each vertex of the N-sided polygon is rounded, and each vertex of the n-sided polygon is rounded.

[0012] In some embodiments, the electrode body is further provided with a blank area, which surrounds the embossed area; the blank area has a first edge and a second edge opposite to each other in the first direction; wherein, along the first direction, the distance between the first edge and the embossed area is L1mm, and the distance between the second edge and the embossed area is L2mm; satisfying: 4mm≤L1mm≤6mm, 8mm≤L2mm≤10mm.

[0013] In some embodiments, the blank area has a third edge and a fourth edge opposite to each other in the second direction; wherein, along the second direction, the distance between the third edge and the embossed area is W1mm, and the distance between the fourth edge and the embossed area is W2mm, satisfying: 0.5mm≤W1mm≤1, 0.5mm≤W2mm≤1mm.

[0014] This utility model also provides a battery cell, the battery cell comprising battery electrodes according to any one of the above claims.

[0015] Compared with the prior art, the battery electrode of this embodiment has the following advantages: by limiting the orthographic projection area of ​​the first embossing on the reference plane to be greater than that of the second embossing, and by limiting the depth H of the first embossing to be greater than that of the second embossing, the larger volume of the first embossing stores more electrolyte, while the smaller volume of the second embossing has better fluidity. The interconnection between adjacent first embossings is achieved through several second embossings, forming a composite embossing structure with a synergistic effect of electrolyte storage and flow guidance, thus enhancing the flow of electrolyte on the surface of the electrode body. Dynamics and uniformity of distribution; Since the projected area of ​​the first embossing along the third direction on the reference plane is larger than that of the second embossing, during the process of winding the battery electrode sheets to form the cell, the electrolyte supply capacity of the cell corner area can be improved by selecting the first embossing, which mainly arranges the large-capacity liquid storage structure in the corner area of ​​the cell. This provides sufficient active material supply to the corner area of ​​the cell, improves the utilization rate of active material, improves the capacity decay of the cell during long-term cycling, avoids the cell from dropping due to insufficient electrolyte, improves the long-term cycle performance of the battery, and extends the battery life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the battery electrode provided in Embodiment 1 of this utility model;

[0017] Figure 2 yes Figure 1 AA section view;

[0018] Figure 3 This is a schematic diagram of the structure of the battery electrode provided in Embodiment 2 of this utility model;

[0019] Figure 4 yes Figure 3 BB cross-sectional view;

[0020] Figure 5 This is a schematic diagram of the structure of the battery electrode provided in Embodiment 3 of this utility model;

[0021] Figure 6 yes Figure 5 CC section view;

[0022] Figure 7 This is a schematic diagram of the structure of the battery electrode provided in Embodiment 4 of this utility model;

[0023] Figure 8 yes Figure 7 DD sectional view.

[0024] In the diagram, 1 is the electrode body; 11 is the embossed area; 12 is the blank area; 111 is the first embossed pattern; 112 is the second embossed pattern; 121 is the first edge; 122 is the second edge; 123 is the third edge; 124 is the fourth edge; 1121 is the first second embossed pattern; 1122 is the second second embossed pattern; 1123 is the third second embossed pattern.

[0025] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0026] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0027] In the description of this utility model, it should be understood that the terms "length", "width", "thickness", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0032] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0033] Example 1

[0034] like Figures 1 to 2 As shown, Embodiment 1 of this utility model provides a battery electrode sheet having a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other. The battery electrode sheet includes an electrode sheet body 1, and the electrode sheet body 1 is provided with an embossed area 11. The embossed area 11 has a plurality of spaced first embossed patterns 111, and adjacent two first embossed patterns 111 are connected by a plurality of second embossed patterns 112. The first direction X and the second direction Y intersect to form a reference plane. Along the third direction Z, the orthographic projection area of ​​the first embossed pattern 111 on the reference plane is greater than the orthographic projection area of ​​the second embossed pattern 112 on the reference plane. Along the third direction Z, the depth of the first embossed pattern 111 is H μm, and the depth of the second embossed pattern 112 is h μm, satisfying: h < H.

[0035] Based on this technical solution, by limiting the orthographic projection area of ​​the first embossing 111 on the reference plane to be greater than the orthographic projection area of ​​the second embossing 112, and by limiting the depth H of the first embossing 111 to be greater than the depth h of the second embossing 112, the larger volume of the first embossing 111 stores more electrolyte, while the smaller volume of the second embossing 112 has better fluidity. By using several second embossings 112 to achieve connectivity between adjacent first embossings 111, the first embossings 111 and the second embossings 112 can form a composite embossing structure with a synergistic effect of electrolyte storage and flow conduction, thereby enhancing the fluidity of the electrolyte on the surface of the electrode body 1. Uniformity of distribution: Since the projected area of ​​the first embossing 111 along the third direction Z on the reference plane is larger than the projected area of ​​the second embossing 112, during the process of winding the battery electrode sheets to form the battery cell, the electrolyte supply capacity of the battery cell corner area can be improved by selecting the first embossing 111 with a large capacity liquid storage structure to be mainly arranged in the corner area of ​​the battery cell. This provides sufficient active material supply to the corner area of ​​the battery cell, improves the utilization rate of active material, improves the capacity decay of the battery cell during long-term cycling, avoids the battery cell from dropping due to insufficient electrolyte, improves the long-term cycle performance of the battery, and extends the battery life.

[0036] Among them, "cell drop" usually refers to a sudden and sharp drop in voltage or capacity of a battery during the cycle (especially in the middle and later stages).

[0037] The battery electrode can be either a positive electrode or a negative electrode.

[0038] In this first embodiment, the first direction X is the length direction of the battery electrode, the second direction Y is the width direction of the battery electrode, and the third direction Z is the thickness direction of the battery electrode.

[0039] In this first embodiment, the reference plane is the XY plane.

[0040] See Figure 1 The electrode body 1 is also provided with a blank area 12, which surrounds the embossed area 11. The blank area 12 has a first edge 121 and a second edge 122 opposite to each other in the first direction X. The distance between the first edge 121 and the embossed area 11 along the first direction X is L1mm, and the distance between the second edge 122 and the embossed area 11 is L2mm.

[0041] Preferably, 4mm ≤ L1mm ≤ 6mm, and 8mm ≤ L2mm ≤ 10mm. If the blank area 12 is too close to the edge of the embossed area 11 at the first edge 121 and the second edge 122, it can easily lead to insufficient adhesion between the coating and the current collector (aluminum foil / copper foil), causing peeling or microcracks. Since the blank area 12 cannot contribute to the capacity but occupies the battery volume and reduces the overall energy density, L1 and L2 should not be set too large.

[0042] It is understandable that the distance between the first edge 121 and the embossed area 11 refers to the distance between the first edge 121 and the end of the embossed area 11 closest to the first edge 121 in the first direction X, and the distance between the second edge 122 and the embossed area 11 refers to the distance between the second edge 122 and the end of the embossed area 11 closest to the second edge 122 in the first direction X.

[0043] L1mm can be any size value that satisfies 4mm≤L1mm≤6mm, such as 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, 5.2mm, 5.5mm, 6mm, etc.

[0044] L2mm can be any size value that satisfies 8mm≤L2mm≤10mm, such as 8mm, 8.2mm, 8.5mm, 8.8mm, 9mm, 9.2mm, 9.5mm, 10mm, etc.

[0045] The blank area 12 has a third edge 123 and a fourth edge 124 opposite each other in the second direction Y; wherein, along the second direction Y, the distance between the third edge 123 and the embossed area 11 is W1mm, and the distance between the fourth edge 124 and the embossed area 11 is W2mm.

[0046] Preferably, 0.5mm ≤ W1mm ≤ 1mm and 0.5mm ≤ W2mm ≤ 1mm. If the blank areas 12 are too close to the edges of the embossed areas 11 at the third edge 123 and the fourth edge 124, it can easily lead to insufficient adhesion between the coating and the current collector (aluminum foil / copper foil), causing peeling or microcracks. Since the blank areas 12 do not contribute to the capacity but occupy battery volume and reduce the overall energy density, W1 and W2 should not be set too large.

[0047] It is understandable that the distance between the third edge 123 and the embossed area 11 refers to the distance between the third edge 123 and the end of the embossed area 11 closest to the first edge 121 in the second direction Y, and the distance between the fourth edge 124 and the embossed area 11 refers to the distance between the fourth edge 124 and the end of the embossed area 11 closest to the second edge 122 in the second direction Y.

[0048] W1mm can be any size value that satisfies 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc., where 0.5mm≤W1mm≤1mm is the minimum value.

[0049] W2mm can be any size value that satisfies 0.5mm ≤ W2mm ≤ 1mm, such as 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm.

[0050] Preferably, the first embossing 111 is N-sided, and the second embossing 112 is n-sided; N≥3 and N is an integer, n≥3 and n is an integer. The polygonal embossing provides wider connection channels between adjacent grooves and facilitates edge alignment, enhancing the connectivity between the first embossing 111 and the second embossing 112. This optimizes the electrolyte flow path on the electrode surface, improves electrolyte transport efficiency and distribution uniformity, and helps improve electrolyte wetting ability in the corner areas of the battery cell, reducing lithium plating in these areas.

[0051] The arrangement can be either N≠n, for example, the first embossed pattern 111 is a quadrilateral and the second embossed pattern 112 is a combination of triangles; the first embossed pattern 111 is a pentagon and the second embossed pattern 112 is a combination of triangles; the first embossed pattern 111 is a quadrilateral and the second embossed pattern 112 is a combination of pentagons; or the first embossed pattern 111 is a hexagon and the second embossed pattern 112 is a combination of hexagons.

[0052] Preferably, N = n.

[0053] More preferably, each vertex of the N-sided polygon has rounded corners, and each vertex of the n-sided polygon has rounded corners. By setting rounded corners at each vertex, stress concentration at the vertices of the polygonal embossing can be reduced, improving the structural flexibility and deformation resistance of the embossing, thereby avoiding the risk of breakage of the battery electrode during processing or use. Moreover, the rounded corners also help improve the wettability and flowability of the electrolyte in the edge area of ​​the embossing, reducing dead zones in electrolyte flow caused by geometric abrupt changes, and further improving the uniformity of electrolyte distribution.

[0054] The common endpoint of two adjacent sides is called a vertex of a polygon; for example, a triangle has three vertices, a quadrilateral has four vertices, a pentagon has five vertices, and a hexagon has six vertices.

[0055] The number of winding layers for flat cells is 15-25, with the corner area accounting for 20%. The recommended embossing shapes are N=3 (trilateral) and N=4 (quadrilateral). This ensures both electrolyte wettability in the corner area and space for silicon doping expansion on the surface, while also minimizing ED energy density loss.

[0056] The number of winding layers for narrow and thick and narrow and long battery cells is 40-55 layers, with the corner area accounting for 30%-50%; the recommended embossing shape is N=5 (pentagon) and shape N=6 (hexagon); the corner area of ​​narrow and thick and narrow and long battery cells accounts for a large proportion, especially the inner ring of the battery cell, where electrolyte penetration is difficult, so it is necessary to increase the embossing area and density to ensure electrolyte storage and full penetration.

[0057] The corner areas of cylindrical battery cells cannot be defined, so it depends on the situation. If the number of winding turns of a cylindrical battery cell is less than 20, it can be regarded as a flat battery cell, and the recommended embossing shapes are N=3 (trilateral) and N=4 (quadrilateral). If the number of winding turns of a cylindrical battery cell is between 20 and 40, it can be regarded as a narrow and thick battery cell, and the recommended embossing shapes are N=5 (pentagon) and N=6 (hexagon). If the number of winding turns of a cylindrical battery cell is greater than 40, it can be regarded as a battery cell with all corners, and the recommended embossing shape is N>6.

[0058] In this first embodiment, N = n = 3, that is, the first embossing 111 is triangular in shape, and all three vertices of the triangular first embossing 111 are rounded; that is, the second embossing 112 is triangular in shape, and all three vertices of the triangular second embossing 112 are rounded.

[0059] In this first embodiment, the first embossing 111 is an isosceles triangle, and the second embossing 112 is also an isosceles triangle; that is, the shapes of the first embossing 111 and the second embossing 112 are identical. Using a consistent embossing structure improves the overall consistency and symmetry of the embossed pattern on the electrode surface, helps achieve a more uniform pressure distribution during mechanical pressing, and reduces stress concentration or localized deformation caused by structural differences, thereby improving the embossing quality and product consistency. Regarding electrolyte transport, the consistent embossing structures have better edge matching and transition, facilitating a smoother electrolyte flow path and further improving the electrolyte transport efficiency between the first embossing 111 (the reservoir structure) and the second embossing 112 (the guide structure). This also helps to further improve the electrolyte wetting ability in the corner areas of the battery cell.

[0060] It is understandable that the shape of the first embossing 111 and the shape of the second embossing 112 are the same, meaning that the first embossing and the second embossing have the same geometric shape in the design intent, and are both the same polygonal structure. Although there may be slight dimensional differences due to manufacturing tolerances and other reasons in the actual production process, such as small changes in side length or interior angle, on a macro scale, the shape of the first embossing 111 and the shape of the second embossing 112 present the same polygonal outline, so it can be considered that the shape of the first embossing 111 and the shape of the second embossing 112 are the same.

[0061] In this first embodiment, along the first direction X, two adjacent first embossings 111 are connected by two second embossings 112; along the second direction Y, two adjacent first embossings 111 are connected by one second embossing 112.

[0062] In this first embodiment, the vertex of the second triangular embossing 112 is connected to the edge of the first triangular embossing 111, that is, the second embossing 112 is connected to the first embossing 111 through its vertex.

[0063] Preferably, along the third direction Z, the depth of the first embossing 111 is H μm, and the depth of the second embossing 112 is h μm, satisfying: 1.5h ≤ H ≤ 2h. By limiting 1.5h ≤ H ≤ 2h, a certain depth difference is formed between the deeper first embossing 111 and the second embossing 112, thereby creating a potential energy difference that is conducive to electrolyte flow. Specifically, the deeper first embossing 111 can serve as the main storage area for the electrolyte, while the relatively shallower second embossing 112 plays a guiding and transitional role; the depth difference between the first embossing 111 and the second embossing 112 can generate a certain flow potential energy driven by gravity or capillary action during electrolyte distribution, thereby improving the fluidity and distribution uniformity of the electrolyte among the composite embossing structures, and promoting spontaneous flow and rapid wetting of the electrolyte.

[0064] The ratio of the depth of the first embossing 111 to the depth of the second embossing 112 can be any formula satisfying the relationship 1.5h = H, 1.6h = H, 1.7h = H, 1.8h = H, 1.8h = H, 2h = H, etc.

[0065] Preferably, 50μm≤hμm≤100μm. By limiting the depth h of the second embossing 112 to 50μm to 100μm, it can be matched with the depth ratio of the first embossing 111 and the second embossing 112, which is 1.5h≤H≤2h. This allows a reasonable potential energy difference to be formed between the first embossing 111 of the large liquid storage structure and the second embossing 112 of the flow guiding structure, further promoting the spontaneous flow and rapid wetting of the electrolyte.

[0066] The depth hμm of the second embossing 112 can be any size value that satisfies 50μm≤h≤100μm, such as 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm.

[0067] Along the first direction X, the dimensions of the first embossing 111 are B1mm and the dimensions of the second embossing 112 are B2mm; along the second direction Y, the dimensions of the first embossing 111 are D1mm and the dimensions of the second embossing 112 are D2mm, satisfying the following conditions: 4mm≤B1mm≤8mm; 2mm≤B2mm≤4mm; 4mm≤D1mm≤8mm; 2mm≤D2≤4mm. Setting the length B1 and width D1 of the first embossing 111 within the range of 4mm to 8mm ensures that the first embossing 111 has sufficient electrolyte storage capacity, especially suitable for areas prone to lithium plating such as cell corners, thereby improving the local electrolyte supply capacity and alleviating the problem of decreased utilization of active materials due to insufficient lithium-ion supply. Meanwhile, controlling the length B2 and width D2 of the second embossing 112 between 2mm and 4mm facilitates the formation of good flow channels, enhances the connectivity between various electrolyte storage structures, and promotes rapid diffusion and uniform distribution of the electrolyte.

[0068] B1mm can be any size value that satisfies 4mm≤B1mm≤8mm, such as 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc.

[0069] B2mm can be any size value that satisfies 2mm≤B2mm≤4mm, such as 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc.

[0070] D1mm can be any size value that satisfies 4mm≤D1mm≤8mm, such as 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc.

[0071] D2mm can be any size value that satisfies 2mm≤D2mm≤4mm, such as 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc.

[0072] Example 2

[0073] See Figures 3 to 4 Unlike Embodiment 1, N = n = 4, that is, the shape of the first embossing 111 is quadrilateral, and the four vertices of the quadrilateral first embossing 111 are all rounded; that is, the shape of the second embossing 112 is quadrilateral, and the four vertices of the quadrilateral second embossing 112 are all rounded.

[0074] Specifically, in this second embodiment, the first embossing 111 is square in shape, and the shape of the first embossing 111 is rotated 45° around its center to obtain the shape of the second embossing 112.

[0075] In this second embodiment, along the first direction X, two adjacent first embossings 111 are connected by a second embossing 112; along the second direction Y, two adjacent first embossings 111 are connected by a second embossing 112.

[0076] In this second embodiment, the vertex of the second quadrilateral embossing 112 is connected to the edge of the first quadrilateral embossing 111, that is, the second embossing 112 is connected to the first embossing 111 through its vertex.

[0077] In some other embodiments, the shapes of the first embossed pattern 111 and the second embossed pattern 112 can be made identical to achieve the connection between the first embossed pattern 111 and the second embossed pattern 112. For example, one side of the quadrilateral second embossed pattern 112 can be overlapped with one side of the quadrilateral first embossed pattern 111 to connect the first embossed pattern 111 and the second embossed pattern 112.

[0078] Example 3

[0079] See Figures 5 to 6 Unlike Embodiment 1, N = n = 5, that is, the first embossing 111 is pentagonal in shape, and all five vertices of the pentagonal first embossing 111 are rounded; that is, the second embossing 112 is pentagonal in shape, and all five vertices of the pentagonal second embossing 112 are rounded.

[0080] Specifically, in this third embodiment, the first embossing 111 is in the shape of a regular pentagon, and the shape of the first embossing 111 is the same as that of the second embossing 112.

[0081] In this third embodiment, along the first direction X, two adjacent first embossed patterns 111 are connected by a second embossed pattern 112; along the second direction Y, two adjacent first embossed patterns 111 are connected by three second embossed patterns 112; more specifically, the three second embossed patterns 112 of two adjacent first embossed patterns 111 located in the second direction Y are arranged in a triangular pattern; these three second embossed patterns 112 are respectively referred to as the first embossed pattern 1121, the second second embossed pattern 1122, and the third embossed pattern 1121, the first second embossed pattern 112 being in the first direction X. Two vertices on X are connected to the edges of the second embossing 1122 and the third embossing 1123 respectively, so as to achieve the connectivity of the three second embossings 112; two adjacent first embossings 111 along the second direction Y are denoted as the first first embossing and the second second embossing; a vertex of the first second embossing 1121 is connected to the edge of the first first embossing, a vertex of the second second embossing 1122 is connected to the edge of the second first embossing, and a vertex of the third second embossing 1123 is connected to the edge of the second first embossing.

[0082] Example 4

[0083] See Figures 7 to 8 Unlike Embodiment 1, N = n = 6, that is, the first embossing 111 is hexagonal in shape, and all six vertices of the hexagonal first embossing 111 are rounded; that is, the second embossing 112 is hexagonal in shape, and all six vertices of the hexagonal second embossing 112 are rounded.

[0084] Specifically, in this fourth embodiment, the first embossing 111 is a regular hexagon, the first embossing 111 is a regular pentagon, and the shape of the first embossing 111 is the same as that of the second embossing 112.

[0085] In this fourth embodiment, along the first direction X, two adjacent first embossed patterns 111 are connected by a second embossed pattern 112; along the second direction Y, two adjacent first embossed patterns 111 are connected by a second embossed pattern 112; more specifically,

[0086] In this fourth embodiment, one side of the hexagonal second embossing 112 is connected to one side of the hexagonal first embossing 111, that is, one side of the hexagonal second embossing 112 overlaps with one side of the hexagonal first embossing 111, so that the first embossing 111 and the second embossing 112 are connected.

[0087] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery electrode having three perpendicular directions (X, Y, and Z), characterized in that, include: Electrode body (1), the electrode body (1) is provided with embossed area (11), the embossed area (11) has a plurality of spaced first embossings (111), and two adjacent first embossings (111) are connected by a plurality of second embossings (112). Wherein, the first direction (X) and the second direction (Y) intersect to form a reference plane; along the third direction (Z), the orthographic projection area of ​​the first embossing (111) on the reference plane is greater than the orthographic projection area of ​​the second embossing (112) on the reference plane; Along the third direction (Z), the depth of the first embossing (111) is H μm, and the depth of the second embossing (112) is h μm, satisfying: h < H.

2. The battery electrode according to claim 1, characterized in that, Along the third direction (Z), the depth of the first embossing (111) is H μm, and the depth of the second embossing (112) is h μm, satisfying: 1.5h≤H≤2h.

3. The battery electrode according to claim 2, characterized in that, 50μm≤hμm≤100μm.

4. The battery electrode according to claim 1, characterized in that, Along the first direction (X), the size of the first embossed pattern (111) is B1mm and the size of the second embossed pattern (112) is B2mm; along the second direction (Y), the size of the first embossed pattern (111) is D1mm and the size of the second embossed pattern (112) is D2mm, satisfying: 4mm≤B1mm≤8mm; 2mm≤B2mm≤4mm; 4mm≤D1mm≤8mm; 2mm≤D2≤4mm.

5. The battery electrode according to claim 1, characterized in that, The first embossed pattern (111) is N-sided, and the second embossed pattern (112) is n-sided; N≥3 and N is an integer, n≥3 and n is an integer.

6. The battery electrode according to claim 5, characterized in that, The shape of the first embossing (111) is the same as the shape of the second embossing (112).

7. The battery electrode according to claim 5, characterized in that, The N-sided polygon has rounded corners at each vertex, and the n-sided polygon has rounded corners at each vertex.

8. The battery electrode according to claim 1, characterized in that, The electrode body (1) is also provided with a blank area (12), which surrounds the embossed area (11); the blank area (12) has a first edge (121) and a second edge (122) opposite each other in the first direction (X); Wherein, along the first direction (X), the distance between the first edge (121) and the embossed area (11) is L1mm, and the distance between the second edge (122) and the embossed area (11) is L2mm; satisfying: 4mm≤L1mm≤6mm, 8mm≤L2mm≤10mm.

9. The battery electrode according to claim 8, characterized in that, The blank area (12) has a third edge (123) and a fourth edge (124) opposite each other in the second direction (Y); Wherein, along the second direction (Y), the distance between the third edge (123) and the embossed area (11) is W1mm, and the distance between the fourth edge (124) and the embossed area (11) is W2mm, satisfying: 0.5mm≤W1mm≤1mm, 0.5mm≤W2mm≤1mm.

10. A battery cell, characterized in that, Includes the battery electrode according to any one of claims 1-9.

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