Pole piece, pole core, battery, battery assembly and electric equipment

Abstract

The utility model discloses a pole piece, pole core, battery, battery pack and electric equipment, said pole piece includes conducting layer and dressing layer, said dressing layer is provided on the surface of conducting layer, along the first direction, said dressing layer has two opposite side edge, is provided with at least one groove on the dressing layer, and said dressing layer is provided with at least one groove. At least one part of the groove bends and extends towards one of the two side edges which are far away from the dressing layer and are in the first direction along a second direction, and the first direction is intersected with the second direction. According to the pole piece disclosed by the utility model, the infiltration speed of electrolyte is improved, the flexibility of the pole piece is also improved, and the pole piece is easy to bend.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a pole piece, a pole core, a battery, a battery assembly and an electrical equipment. Background Art

[0002] In the related art, a pole piece is mainly composed of a metal current collector or a composite current collector, and a negative or positive electrode material coated on the current collector on one side or both sides, and is manufactured through processes such as flat roller rolling and cutting. The pole piece manufactured by a flat roller has good flatness. However, due to the large particle packing density on the surface of the pole piece after rolling, the speed of electrolyte infiltration into the pole piece is slow during the subsequent battery manufacturing process. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a pole piece, which improves the electrolyte infiltration speed and also improves the flexibility of the pole piece, making it easy to bend.

[0004] A second object of the utility model is to provide a pole core using the above-mentioned pole piece.

[0005] A third object of the utility model is to provide a battery using the above-mentioned pole core.

[0006] A fourth object of the utility model is to provide a battery assembly using the above-mentioned pole core or the above-mentioned battery.

[0007] A fifth object of the utility model is to provide an electrical equipment using the above-mentioned battery or the above-mentioned battery assembly.

[0008] The pole piece according to the first aspect embodiment of the utility model includes: a conductive layer; a dressing layer provided on the surface of the conductive layer. Along a first direction, the dressing layer has two opposite side edges. At least one groove is formed on the dressing layer, and at least a part of the groove bends and extends along a second direction away from one of the two side edges of the dressing layer along the first direction, and the first direction intersects with the second direction.

[0009] According to the pole piece of the present utility model, the electrolyte can penetrate into the conductive layer along the depth direction of the groove, shortening the moving distance of the electrolyte and improving the wetting speed of the electrolyte on the pole piece. Moreover, when the pole piece is wound to form a pole core, the electrolyte can flow along the extending direction of the groove or penetrate into the dressing layer from the side wall of the groove, thereby facilitating the penetration of the electrolyte from the outside of the pole core into the dressing layer of the pole piece and shortening the moving distance of the electrolyte from the outside of the pole core into the dressing layer of the pole piece. In addition, due to the arrangement of the groove, when the pole piece is wound to form a pole core, the flexibility of the pole piece is improved, and the deformation and adaptability of the pole piece are also improved, thereby reducing the influence of bending on the pole piece and also reducing the production difficulty of the pole core.

[0010] According to some embodiments of the present utility model, when the pole piece is wound into a cylindrical shape along the first direction, the groove is a spiral groove that bends and extends along the circumferential surface of the cylinder.

[0011] According to some embodiments of the present utility model, the groove penetrates through the two side surfaces of the dressing layer along the second direction; or, the groove penetrates through the adjacent two side surfaces of the dressing layer.

[0012] According to some embodiments of the present utility model, the width of the groove is w, where w satisfies: 0.5 μm ≤ w ≤ 100 μm.

[0013] According to some embodiments of the present utility model, w further satisfies: 20 μm ≤ w ≤ 50 μm.

[0014] According to some embodiments of the present utility model, the depth of the groove is h1, and the thickness of the dressing layer is h2, where h1 and h2 satisfy: 0 < h1 / h2 ≤ 0.9.

[0015] According to some embodiments of the present utility model, h1 and h2 further satisfy: 0.3 ≤ h1 / h2 ≤ 0.7.

[0016] According to some embodiments of the present utility model, h2 satisfies: 20 μm ≤ h2 ≤ 250 μm.

[0017] According to some embodiments of the present utility model, the cross-sectional shape of the groove is a polygon or an arc.

[0018] According to some embodiments of the present utility model, the thickness of the conductive layer is h3, and h3 satisfies: 9 μm ≤ h3 ≤ 25 μm.

[0019] According to some embodiments of the present utility model, along the second direction, the groove first bends and extends towards one of the two sides along the first direction away from the dressing layer, and then bends and extends towards one of the two sides along the first direction close to the dressing layer.

[0020] According to some embodiments of the present utility model, the dressing layer is multi-layered, and the multi-layered dressing layers are respectively arranged on both surface sides in the thickness direction of the conductive layer.

[0021] According to some embodiments of the present utility model, there are a plurality of the grooves, and the plurality of grooves are arranged at intervals along the first direction.

[0022] According to some embodiments of the present utility model, the minimum distance between two adjacent grooves is d, where d satisfies: 0.1 mm ≤ d ≤ 20 mm.

[0023] According to some embodiments of the present utility model, d further satisfies: 5 mm ≤ d ≤ 10 mm.

[0024] The electrode core according to the embodiment of the second aspect of the present utility model includes the electrode sheet according to the above-mentioned first aspect embodiment of the present utility model.

[0025] The battery according to the embodiment of the third aspect of the present utility model includes the electrode core according to the above-mentioned second aspect embodiment of the present utility model.

[0026] The battery assembly according to the embodiment of the fourth aspect of the present utility model includes the electrode core according to the above-mentioned second aspect embodiment of the present utility model, or the battery according to the above-mentioned third aspect embodiment of the present utility model.

[0027] The electrical equipment according to the embodiment of the fifth aspect of the present utility model includes the battery according to the above-mentioned third aspect embodiment of the present utility model, or the battery assembly according to the above-mentioned fourth aspect embodiment of the present utility model.

[0028] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0029] The above-mentioned and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0030] Figure 1 is a side view of the electrode sheet according to the embodiment of the present utility model;

[0031] Figure 2 is a top view of the electrode sheet according to the embodiment of the present utility model, where an electrode tab is connected to the electrode sheet;

[0032] Figure 3 is a top view of a pole piece according to another embodiment of the present utility model, wherein a tab is connected to the pole piece;

[0033] Figure 4 is a top view of a pole piece according to still another embodiment of the present utility model, wherein a plurality of grooves are densely arranged;

[0034] Figure 5 is a schematic diagram of a pole core according to an embodiment of the present utility model.

[0035] Reference numerals:

[0036] 100, pole piece;

[0037] 1, conductive layer;

[0038] 2, dressing layer; 21, groove;

[0039] 200, pole core; 201, tab. Detailed Description of the Embodiment

[0040] The embodiments of the present utility model will be described in detail below. The embodiments described with reference to the drawings are exemplary. Below, reference is made to Figures 1 - 4 Describe the pole piece 100 according to the embodiment of the first aspect of the present utility model. The pole piece 100 can be used to manufacture the pole core 200, but is not limited thereto. In the following description of the present application, the pole piece 100 is taken as an example for use in the pole core 200 for detailed description.

[0041] As Figure 1 shown, the pole piece 100 according to the embodiment of the first aspect of the present utility model includes a conductive layer 1 and a dressing layer 2.

[0042] Specifically, the dressing layer 2 is provided on the surface of the conductive layer 1. Along the first direction (such as Figure 2 the left - right direction shown), the dressing layer 2 has two opposite side edges. At least one groove 21 is formed on the dressing layer 2. At least a part of the groove 21 bends and extends along the second direction (such as Figure 3 and Figure 5 the up - down direction shown) towards one of the two above - mentioned side edges of the dressing layer 2 along the first direction. The first direction and the second direction can be intersecting, for example, the first direction and the second direction are perpendicular.

[0043] For example, in the Figures 1 - 3 example, the groove 21 is recessed towards the conductive layer 1 to form. For example, the setting of the groove 21 can include the following situations: First, from top to bottom, the middle part and the lower part of the groove 21 bend and extend towards the direction away from the right - hand side edge of the dressing layer 2, and the middle part of the groove 21 protrudes towards the lower - right corner of the dressing layer 2 (such asFigure 3 and Figure 4 As shown). Second, it bends and extends downward from the upper part, and the middle part and the lower part of the groove 21 face away from the right side of the dressing layer 2, and the middle part of the groove 21 protrudes towards the upper left corner of the dressing layer 2 (as Figure 5 shown). However, it is not limited to this.

[0044] With such a setting, when the electrolyte enters the conductive layer 1 from the dressing layer 2, the electrolyte first enters the groove 21, and then soaks into the dressing layer 2 along the bottom wall and the side wall of the groove 21 and then into the conductive layer 1. That is, the electrolyte can penetrate into the conductive layer 1 along the depth direction of the groove 21, thereby shortening the moving distance of the electrolyte in the dressing layer 2, improving the infiltration speed of the electrolyte, and further improving the infiltration speed of the electrolyte from the outside of the electrode sheet 100 into the inside of the electrode sheet 100. Moreover, when the electrode sheet 100 is wound to form the electrode core 200, the electrolyte flowing to the electrode core 200 can flow along the extending direction of the groove 21 and quickly penetrate into the dressing layer 2 along the side wall of the groove 21. That is to say, the setting of the groove 21 not only facilitates the penetration of the electrolyte from the outside of the electrode core 200 into the dressing layer 2 of the electrode sheet 100, but also can shorten the moving distance of the electrolyte from the dressing layer 2 to the conductive layer 1. In addition, the electrode sheet 100 can form the electrode core 200 by stacking or winding. When the electrode sheet 100 forms the electrode core 200 by winding, the electrode sheet 100 is bent, and the bending extension of the groove 21 improves the flexibility of the electrode sheet 100 and also improves the deformation and adaptability of the electrode sheet 100, thereby reducing the influence of the bending on the electrode sheet 100, reducing the production difficulty of the electrode core 200, and improving the production efficiency of the electrode core 200.

[0045] For the electrode sheet 100 according to the present invention, the electrolyte can penetrate into the conductive layer 1 along the depth direction of the groove 21, shortening the moving distance of the electrolyte and improving the infiltration speed of the electrolyte into the electrode sheet 100. Moreover, when the electrode sheet 100 is wound to form the electrode core 200, the electrolyte can flow along the extending direction of the groove 21 or penetrate into the dressing layer 2 from the side wall of the groove 21, thereby facilitating the penetration of the electrolyte from the outside of the electrode core 200 into the dressing layer 2 of the electrode sheet 100 and shortening the moving distance of the electrolyte from the outside of the electrode core 200 into the dressing layer 2 of the electrode sheet 100. In addition, due to the setting of the groove 21, when the electrode sheet 100 forms the electrode core 200 by winding, the flexibility of the electrode sheet 100 is improved, and the deformation and adaptability of the electrode sheet 100 are also improved, thereby reducing the influence of the bending on the electrode sheet 100 and reducing the production difficulty of the electrode core 200.

[0046] According to some embodiments of the present invention, referring to Figure 5When the pole piece 100 is wound into a cylindrical shape along a first direction (i.e., the left-right direction), the groove 21 is a spiral groove that bends and extends along the circumference of the cylinder. For example, when the pole piece 100 is wound to form a pole core 200, the groove 21 is a spiral bend that is repeatedly wrapped around the outer circumference of the cylinder along the axial direction of the cylinder. With such a configuration, when the pole piece 100 is bent and wound into a cylinder, the spiral groove 21 facilitates the bending of the pole piece 100, reduces the difficulty of winding the pole piece 100 into a cylindrical shape, and thus improves the production efficiency of the pole core 200. In addition, the spiral groove 21 can produce a certain degree of deformation and adaptability, thereby reducing the impact of bending on the pole piece 100, and improving the flexibility of the pole piece 100, reducing the difficulty of winding the pole piece 100. In addition, the electrolyte can also flow along the extension direction of the groove 21, so that the electrolyte contacts and infiltrates with various places on the dressing layer 2.

[0047] According to some embodiments of the present invention, referring to Figure 2 The groove 21 passes through the two side surfaces of the dressing layer 2 along the second direction (i.e., the up-down direction). Figure 2 In the example, when the groove 21 bends and extends in the up-down direction, the groove 21 penetrates the upper and lower sides of the dressing layer 2. Therefore, when the electrolyte is introduced, the electrolyte can flow from the top to the bottom on the dressing layer 2, so that the electrolyte contacts and infiltrates all parts of the dressing layer 2, thereby improving the uniformity of the electrolyte infiltration on the electrode 100, and further helping to further improve the performance of the electrode 100. In addition, it is also conducive to the processing and formation of the groove 21, reducing the difficulty of producing the electrode 100.

[0048] According to some further embodiments of the present invention, referring to Figure 3 The groove 21 passes through the adjacent two side surfaces of the dressing layer 2. For example, the arrangement of the groove 21 includes the following situations: first, the groove 21 passes through the upper side surface and the left side surface (such as Figure 3 Second, the groove 21 runs through the lower side and right side of the dressing layer 2 (such as Figure 3 The lower right corner of the dressing layer 2 in the middle). But it is not limited to this. When there are multiple grooves 21, the multiple grooves 21 can be respectively set as grooves that penetrate different sides according to the needs. Thereby, the setting form of the groove 21 is enriched, and it is beneficial to set the groove 21 in accordance with the position of the left and right direction on the dressing layer 2, so as to facilitate the formation of the groove 21 and the infiltration of the electrolyte. For example, the conductive layer 1 can be a metal conductive foil material, which improves the conductive effect of the conductive layer 1. The groove 21 on the dressing layer 2 can be formed by mechanical thread mold stamping or laser ablation.

[0049] According to some embodiments of the present invention, referring to Figure 1, the width of the groove 21 is w, where w satisfies: 0.5 μm ≤ w ≤ 100 μm. For example, when the width w of the groove 21 is less than 0.5 μm, the width of the groove 21 is small, and the accommodation capacity of the groove 21 is small, thereby reducing the amount of electrolyte accommodated in the groove 21, increasing the amount of electrolyte infiltrating from the side of the dressing layer 2 away from the conductive layer 1, and further reducing the speed of electrolyte infiltrating from the dressing layer 2 to the conductive layer 1. When the width w of the groove 21 is greater than 100 μm, the width of the groove 21 is large, reducing the material consumption of the dressing layer 2 and reducing the protective effect of the dressing layer 2 on the conductive layer 1. Thus, by setting the width w of the groove 21 to satisfy 0.5 μm ≤ w ≤ 100 μm, the width of the groove 21 is reasonably set, increasing the amount of electrolyte accommodated in the groove 21, so as to effectively ensure that the electrolyte can infiltrate into the conductive layer 1 from the bottom wall and side wall of the groove 21, and further helping to improve the electrolyte infiltration speed. In addition, the material consumption of the dressing layer 2 is also rationalized, thereby improving the structural strength of the dressing layer 2 and the protective effect of the dressing layer 2 on the conductive layer 1.

[0050] Optionally, w further satisfies: 20 μm ≤ w ≤ 50 μm. Thus, the width of the groove 21 is further rationalized. While ensuring the performance of the dressing layer 2, the accommodation amount of the electrolyte in the groove 21 is further rationalized, increasing the contact area between the electrolyte and the side wall of the groove 21, facilitating the infiltration of the electrolyte into the conductive layer 1, and helping to further improve the infiltration speed.

[0051] According to some embodiments of the present invention, referring to Figure 1 , the depth of the groove 21 is h1, and the thickness of the dressing layer 2 is h2, where h1 and h2 satisfy: 0 < h1 / h2 ≤ 0.9. For example, when the ratio of the depth h1 of the groove 21 to the thickness h2 of the dressing layer 2 is greater than 0.9, the difference between the depth of the groove 21 and the depth of the dressing layer 2 is small, that is, the distance between the bottom wall of the groove 21 and the surface of the corresponding conductive layer 1 is small, thereby reducing the protective effect of the dressing layer 2 on the conductive layer 1 and reducing the use performance of the electrode sheet 100. Thus, by setting the depth h1 of the groove 21 and the thickness h2 of the dressing layer 2 to satisfy 0 < h1 / h2 ≤ 0.9, the ratio of the depth h1 of the groove 21 to the thickness h2 of the dressing layer 2 is reasonably set. While improving the infiltration speed through the groove 21, the protective effect of the dressing layer 2 on the conductive layer 1 is also improved, thereby improving the use performance of the electrode sheet 100.

[0052] Optionally, h1 and h2 further satisfy: 0.3 ≤ h1 / h2 ≤ 0.7. Thus, the ratio of the depth h1 of the groove 21 to the thickness h2 of the dressing layer 2 is further rationalized, thereby improving the electrolyte infiltration speed and the protective effect of the dressing layer 2 on the conductive layer 1, and further improving the use performance of the electrode sheet 100.

[0053] According to some embodiments of the present utility model, h2 satisfies: 20 μm ≤ h2 ≤ 250 μm. For example, when the thickness h2 of the dressing layer 2 is less than 20 μm, the thickness of the dressing layer 2 is small, thereby reducing the activity preservation effect of the dressing layer 2 on the conductive layer 1, increasing the difficulty of forming the groove 21 on the surface of the dressing layer 2, and reducing the production efficiency of the electrode sheet 100. When the thickness h2 of the dressing layer 2 is greater than 250 μm, the thickness of the dressing layer 2 is large, increasing the thickness of the electrode sheet 100, reducing the flexibility of the electrode sheet 100. When the electrode sheet 100 is wound into a cylindrical shape, the electrode sheet 100 is not easily bent, increasing the production difficulty of the electrode sheet 100 and reducing the production efficiency of the electrode core 200. Thus, by setting the thickness h2 of the dressing layer 2 to satisfy 20 μm ≤ h2 ≤ 250 μm, the thickness of the dressing layer 2 is reasonably set, improving the activity preservation effect of the dressing layer 2 on the conductive layer 1, reducing the difficulty of forming the groove 21 on the surface of the dressing layer 2, and improving the production efficiency of the electrode sheet 100. In addition, the flexibility of the electrode sheet 100 is improved. When the electrode sheet 100 is wound into a cylindrical shape, the electrode sheet 100 is easily bent, increasing the production difficulty of the electrode sheet 100 and improving the production efficiency of the electrode core 200.

[0054] According to some embodiments of the present utility model, the cross-sectional shape of the groove 21 is a polygon or an arc. The cross-sectional shape of the groove 21 is simple and easy to form, thereby improving the formation efficiency of the groove 21. It should be noted that when the cross-sectional shape of the groove 21 is a polygon, the cross-sectional shapes of multiple grooves 21 can be one or more of a rectangle, a trapezoid, and a triangle, and the cross-sectional shapes of multiple grooves 21 can be the same or different.

[0055] According to some embodiments of the present utility model, referring to Figure 1 , the thickness of the conductive layer 1 is h3, and h3 satisfies: 9 μm ≤ h3 ≤ 25 μm. For example, in the Figure 1 example, when the thickness h3 of the conductive layer 1 is less than 9 μm, the thickness of the conductive layer 1 is small, thereby reducing the conductivity of the electrode sheet 100 and weakening the use performance of the electrode sheet 100. When the thickness h3 of the conductive layer 1 is greater than 25 μm, the thickness of the conductive layer 1 is thick, reducing the flexibility of the electrode sheet 100. When the electrode sheet 100 is wound, it is not easily bent, increasing the production difficulty of the electrode core 200. In addition, a thicker conductive layer 1 requires more electrolyte to be fully infiltrated, and also prolongs the infiltration time, thereby prolonging the production efficiency of the battery (not shown in the figure). Thus, by setting the thickness h3 of the conductive layer 1 to satisfy 9 μm ≤ h3 ≤ 25 μm, the thickness of the conductive layer 1 is reasonably set, increasing the flexibility of the electrode sheet 100. When the electrode sheet 100 is wound, it is easily bent, reducing the production difficulty of the electrode core 200. In addition, the amount of electrolyte required for infiltrating the conductive layer 1 is reduced, and the infiltration time is also shortened, thereby shortening the production efficiency of the battery.

[0056] Further, referring to Figure 2 , along the second direction (i.e., the up-and-down direction), the groove 21 first bends and extends along one of the two above-mentioned side edges in the first direction (i.e., the left-and-right direction) away from the dressing layer 2, and then bends and extends along one of the two above-mentioned side edges in the first direction close to the dressing layer 2. For example, in the example of Figure 2 , the shape of the groove 21 is generally "C"-shaped. The setting of the groove 21 may include the following situations: First, from top to bottom, the groove 21 first bends and extends along the right side edge away from the dressing layer 2, and then bends and extends along the above-mentioned right side edge close to the dressing layer 2, and the middle part of the groove 21 bulges toward the left side edge of the dressing layer 2 (as shown in Figure 2 ). Second, along the up-and-down direction, the groove 21 first bends and extends along the left side edge away from the dressing layer 2, and then bends and extends along the above-mentioned left side edge close to the dressing layer 2, and the middle part of the groove 21 bulges toward the right side edge of the dressing layer 2 (not shown in the figure). With such a setting, it is effectively ensured that the groove 21 can penetrate through the two opposite side surfaces of the electrode sheet 100 in the up-and-down direction, and when the electrolyte flows along the side wall of the groove 21, it fully contacts and infiltrates the dressing layer 2, thereby effectively further improving the uniformity of infiltration and further improving the use performance of the electrode sheet 100. In addition, when the electrode sheet 100 is wound into a cylindrical shape in the left-and-right direction, the groove 21 bends and extends along the outer peripheral surface of the cylindrical shape in a spiral shape, and the electrolyte can flow along the extending direction of the groove 21 or penetrate into the dressing layer 2 from the side wall of the groove 21, which is beneficial to the infiltration of the electrolyte from the outside of the electrode core 200 into the dressing layer 2 of the electrode sheet 100, shortening the moving distance of the electrolyte from the outside of the electrode core 200 to the dressing layer 2 of the electrode sheet 100.

[0057] According to some embodiments of the present invention, referring to Figure 1 , the dressing layer 2 is multiple layers, and the multiple dressing layers 2 are respectively arranged on the two side surfaces in the thickness direction of the conductive layer 1. For example, in the example of Figure 1 , there are two dressing layers 2, and the two dressing layers 2 are respectively located on the two side surfaces in the thickness direction of the conductive layer 1. With such a setting, the electrolyte can be immersed into the conductive layer 1 from both sides in the thickness direction of the conductive layer 1, increasing the amount of electrolyte infiltrating into the conductive layer 1 per unit time, improving the infiltration effect, and thus contributing to improving the use performance of the electrode sheet 100. It should be noted that the grooves 21 on the dressing layers 2 on both sides in the thickness direction of the conductive layer 1 may be opposite to each other or may be staggered along the thickness direction of the conductive layer 1. However, it is not limited thereto, and it can be specifically set according to the actual use situation.

[0058] Further, referring to Figure 2 , there are multiple grooves 21, and the multiple grooves 21 are arranged at intervals in the first direction (i.e., the left-and-right direction). In the description of the present invention, "multiple" means two or more. For example, inFigure 2 In the example, a plurality of grooves 21 are arranged at intervals in the left - right direction. With such an arrangement, the electrolyte dispersedly flows into the plurality of grooves 21, and the electrolyte can infiltrate from different grooves 21, further improving the infiltration speed of the electrolyte into the electrode sheet 100. In addition, since the plurality of grooves 21 are arranged at intervals in the left - right direction, the electrolyte can infiltrate the electrode sheet 100 from different positions, thereby improving the uniformity of infiltration. In addition, the contact area between the electrolyte and the dressing layer 2 is also increased, which is more conducive to the electrolyte infiltrating into the conductive layer 1.

[0059] According to some embodiments of the present invention, referring to Figure 1 , the minimum distance between two adjacent grooves 21 is d, where d satisfies: 0.1 mm ≤ d ≤ 20 mm. For example, when the minimum distance d between two adjacent grooves 21 is less than 0.1 mm, the distance between two adjacent grooves 21 is small, the plurality of grooves 21 are arranged densely, and the material of the dressing layer 2 between two adjacent grooves 21 is small, reducing the structural strength of the dressing layer 2, thereby reducing the performance of the electrode sheet 100, and increasing the processing difficulty of the grooves 21. When the minimum distance d between two adjacent grooves 21 is greater than 20 mm, the distance between two adjacent grooves 21 is large, the plurality of grooves 21 are arranged sparsely, the number of grooves 21 decreases, and the distribution of the electrolyte in the plurality of grooves 21 is also more dispersed, thereby reducing the uniformity of electrolyte infiltration. Thus, by setting the minimum distance d between two adjacent grooves 21 to satisfy 0.1 mm ≤ d ≤ 20 mm, the minimum distance between two adjacent grooves 21 is reasonably set, the number of grooves 21 is reasonably set, which not only increases the material of the dressing layer 2 between two adjacent grooves 21, increases the structural strength of the dressing layer 2, and improves the performance of the electrode sheet 100, but also makes the electrolyte reasonably distributed in the plurality of grooves 21, thereby improving the uniformity of electrolyte infiltration.

[0060] According to some embodiments of the present invention, d further satisfies: 5 mm ≤ d ≤ 10 mm. Thus, the minimum distance between two adjacent grooves 21 is further optimized, the distance between two adjacent grooves 21 is set more reasonably, and the number of grooves 21 is also rationalized, so that the electrolyte more reasonably flows into the plurality of grooves 21, which helps to further improve the infiltration effect.

[0061] The electrode core 200 according to the embodiment of the second aspect of the present invention includes the electrode sheet 100 according to the above - mentioned first - aspect embodiment of the present invention.

[0062] According to the electrode core 200 of the present utility model, by adopting the above-mentioned electrode sheet 100, the infiltration effect of the electrolyte on the electrode core 200 is improved, and it is also easy to form the electrode core 200, thereby improving the service performance of the electrode core 200 and the production efficiency of the electrode core 200. For example, part of the conductive layer 1 protrudes to form a plurality of electrode tabs 201. When the electrode sheet 100 is wound to form the electrode core 200, the plurality of electrode tabs 201 are arranged radially along the electrode core 200 to form a positive electrode tab or a negative electrode tab, which is beneficial to the use of the electrode core 200.

[0063] The battery (not shown in the figure) according to the third aspect embodiment of the present utility model includes the electrode core 200 according to the second aspect embodiment of the present utility model above.

[0064] According to the battery of the present utility model, by adopting the above-mentioned electrode core 200, the service performance of the battery is improved.

[0065] The manufacturing steps of the battery are roughly as follows: First, two layers of dressing layers 2 (the dressing layer 2 can be a positive electrode dressing layer or a negative electrode dressing layer) are respectively coated on both sides of the conductive layer 1 in the thickness direction according to the battery design. Then, the positive electrode sheet and the negative electrode sheet are respectively roll-pressed by a special roller, and grooves 21 are formed on the surface of the dressing layer 2. Next, the positive electrode sheet, the separator (not shown in the figure) of the electrode core 200, and the negative electrode sheet are assembled in the conventional order, and the electrode core 200 is formed by the way of stacking or winding, and is sealed into a closed housing (not shown in the figure), and after injecting the electrolyte, it is sealed to make a battery. The battery can be a power-type battery or an energy-type battery, but not limited thereto. For example, for a 150Ah energy-type battery, compared with the electrode sheet of a flat dressing layer without grooves, the electrolyte infiltration time is reduced from 48h to about 45.5h, the infiltration time is reduced by 5%, and the fast charging time of the battery is shortened from 25min to about 23min, and the fast charging ability is improved by 8%.

[0066] The battery assembly (not shown in the figure) according to the fourth aspect embodiment of the present utility model includes the electrode core 200 according to the second aspect embodiment of the present utility model above, or the battery according to the third aspect embodiment of the present utility model above.

[0067] According to the battery assembly of the present utility model, by adopting the above-mentioned electrode core 200, or the above-mentioned battery, the service performance of the battery assembly is improved.

[0068] The electrical equipment (not shown in the figure) according to the fifth aspect embodiment of the present utility model includes the battery according to the third aspect embodiment of the present utility model above, or the battery assembly according to the fourth aspect embodiment of the present utility model above.

[0069] For the electrical equipment according to the present utility model, by adopting the above battery or the above battery assembly, the performance of the electrical equipment is improved. It should be noted that the electrical equipment can be a vehicle, an aircraft, a ship, a computer, an energy storage cabinet, etc.

[0070] For those of ordinary skill in the art, the other configurations and operations of the electrode plate 100, electrode core 200, battery, battery assembly and electrical equipment according to the embodiments of the present utility model are known, and will not be described in detail here.

[0071] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "width", "thickness", "upper", "lower", "left", "right", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model.

[0072] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0073] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A pole piece, characterized in that: include: Conductive layer; A dressing layer, wherein the dressing layer is disposed on the surface of the conductive layer, and along a first direction, the dressing layer has two opposite side edges, and at least one groove is formed on the dressing layer, and at least a portion of the groove is bent and extended along a second direction toward one of the two side edges along the first direction away from the dressing layer, and the first direction and the second direction intersect.

2. The pole piece according to claim 1, characterized in that: When the pole piece is wound into a cylindrical shape along the first direction, the groove is a spiral groove that bends and extends along the circumference of the cylinder.

3. The pole piece according to claim 1, characterized in that: The groove runs through the side surfaces of the dressing layer on both sides along the second direction; or The groove runs through two adjacent side surfaces of the dressing layer.

4. The pole piece according to claim 1, characterized in that: The width of the groove is w, wherein w satisfies: 0.5 μm≤w≤100 μm.

5. The pole piece according to claim 4, characterized in that: The w further satisfies: 20 μm≤w≤50 μm.

6. The pole piece according to claim 1, characterized in that: The depth of the groove is h1, and the thickness of the dressing layer is h2, wherein h1 and h2 satisfy: 0<h1 / h2≤0.

9.

7. The pole piece according to claim 6, characterized in that: The h1 and h2 further satisfy: 0.3≤h1 / h2≤0.

7.

8. The pole piece according to claim 6, characterized in that: The h2 satisfies: 20μm≤h2≤250μm.

9. The pole piece according to claim 1, characterized in that: The cross-sectional shape of the groove is polygonal or arc-shaped.

10. The pole piece according to claim 1, characterized in that: The thickness of the conductive layer is h3, and h3 satisfies: 9μm≤h3≤25μm.

11. The pole piece according to any one of claims 1 to 10, characterized in that: Along the second direction, the groove first bends and extends toward one of the two side edges along the first direction away from the dressing layer, and then bends and extends toward one of the two side edges along the first direction close to the dressing layer.

12. The pole piece according to any one of claims 1 to 10, characterized in that: The dressing layer is multi-layered, and the multi-layer dressing layers are respectively arranged on both side surfaces of the conductive layer in the thickness direction.

13. The pole piece according to any one of claims 1 to 10, characterized in that: There are a plurality of grooves, and the plurality of grooves are arranged at intervals along the first direction.

14. The pole piece according to claim 13, characterized in that: The minimum distance between two adjacent grooves is d, wherein d satisfies: 0.1 mm≤d≤20 mm.

15. The pole piece according to claim 14, characterized in that: The d further satisfies: 5mm≤d≤10mm.

16. A pole core, characterized in that: Comprising a pole piece according to any one of claims 1-15.

17. A battery, characterized in that: Comprising the pole core according to claim 16.

18. A battery assembly, characterized in that: Comprising the pole core according to claim 16, or the battery according to claim 17.

19. An electrical equipment, characterized in that: Comprising the battery according to claim 17, or the battery assembly according to claim 18.

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