Pole piece and battery

Abstract

The utility model provides a pole piece and a battery, the pole piece comprises a current collector and an active material layer arranged on at least one side surface of the current collector, the active material layer and the current collector are provided with a plurality of concave parts, and a straight part is formed between the adjacent concave parts; and holes are also formed in the pole pieces and are formed in the concave parts and / or the straight parts. A plurality of sunken parts are arranged on an active material layer and a current collector, and holes are formed in a pole piece. Through the arrangement, the flowing path of the electrolyte is increased, infiltration of the electrolyte is accelerated, and the liquid storage capacity is improved; the moving resistance of lithium ions during charging and discharging is reduced, the impedance of the battery is reduced, lithium precipitation is slowed down, and the cycle performance and service life of the battery are improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to an electrode sheet and a battery. Background Art

[0002] In recent years, lithium-ion batteries have been widely used in various industries. With the rapid development of lithium-ion batteries, people's requirements for their rate performance, safety, lifespan, endurance time, etc. are getting higher and higher. After continuous high-rate fast charging of conventional lithium-ion batteries, there is a phenomenon of lithium plating in the battery, especially serious in the arc area of the battery, which affects the cycle performance and lifespan of the battery. Moreover, after the energy density of the battery is increased, there is also a problem of difficult electrolyte infiltration. Summary of the Utility Model

[0003] In view of this, this application provides an electrode sheet to solve the problems of lithium plating in the battery and difficult electrolyte infiltration. This application also provides a battery including the above electrode sheet.

[0004] To achieve the above object, this application provides the following technical solutions:

[0005] An electrode sheet includes a current collector and an active material layer disposed on at least one surface of the current collector, wherein:

[0006] The active material layer and the current collector are provided with a plurality of recesses, and a flat portion is formed between adjacent recesses;

[0007] Holes are also formed on the electrode sheet, and the holes are disposed in the recesses and / or the flat portions.

[0008] Optionally, the holes are located within the recesses, and the centers of the holes coincide with the centers of the recesses.

[0009] Optionally, active material layers are disposed on both surfaces of the current collector, and are respectively a first active material layer and a second active material layer, wherein:

[0010] On one surface of the first active material layer away from the current collector, first recesses are provided, and on the other surface, first protrusions opposite to the first recesses are provided, and a first flat portion is formed between adjacent first recesses and between adjacent first protrusions;

[0011] On one surface of the second active material layer close to the current collector, second recesses are provided, and the other surface is a flat surface, and a second flat portion is formed between adjacent second recesses;

[0012] On one side surface of the current collector adjacent to the first active material layer, a third recess is provided, and on the other side surface, a third protrusion aligned with the third recess is provided. Between adjacent third recesses and between adjacent third protrusions are all third flat portions.

[0013] Optionally,

[0014] The first active material layer is provided with a first hole, and the first hole communicates with the first recess and the first protrusion;

[0015] The current collector is provided with a third hole, and the third hole communicates with the third recess and the third protrusion;

[0016] Wherein, the first hole communicates with the third hole.

[0017] Optionally,

[0018] The second active material layer is provided with a second hole, and the second hole communicates with the second recess and the plane;

[0019] Wherein, the first hole, the second hole and the third hole communicate with each other.

[0020] Optionally, the holes and the recesses are arranged one-to-one, and the recesses and the holes are both arranged in an array.

[0021] Optionally, the projection shape of the recess in the direction perpendicular to the pole piece is at least one of a circle, a square, a rhombus, an ellipse or a water droplet shape.

[0022] Optionally, the outer diameter of the first recess is D1, the outer diameter of the second recess is D2, and the outer diameter of the third recess is D3, where D1, D2 and D3 satisfy: D1≥D2≥D3.

[0023] Optionally, in the direction perpendicular to the pole piece, the depth of the first recess is L1, the depth of the second recess is L2, and the depth of the third recess is L3, where L1, L2 and L3 satisfy: L1≥L2≥L3.

[0024] Optionally, the outer diameter of the hole is d, and the outer diameter of the recess is D, where D and d satisfy: 1.1≤D:d≤50.

[0025] Optionally,

[0026] The outer diameter of the recess is D, where D satisfies: 1mm≤D≤5mm;

[0027] In the direction perpendicular to the pole piece, the depth of the recess is L, where L satisfies: 10μm≤L≤180μm.

[0028] Optionally, in a direction perpendicular to the electrode tab, the depth of the recess is L and the thickness of the active material layer is M, where L and M satisfy: 1 ≤ L:M ≤ 2.5.

[0029] Optionally,

[0030] In the length direction of the electrode tab, the distance between adjacent recesses is W1, and the outer diameter of the recess is D, where W1 and D satisfy: W1 ≥ 1.2*D; and / or,

[0031] In the width direction of the electrode tab, the distance between adjacent recesses is W2, and the outer diameter of the recess is D, where W2 and D satisfy: W2 ≥ 1.2*D.

[0032] Optionally, in a direction perpendicular to the electrode tab, the diameters of the first hole, the second hole, and the third hole are the same.

[0033] A battery includes the above-mentioned electrode tab.

[0034] For the electrode tab provided in the present application, by providing a plurality of recesses in the active material layer and the current collector, and by providing holes in the electrode tab. With such a setting, the path of electrolyte flow is increased, the infiltration of the electrolyte is accelerated, and the liquid storage capacity is improved; the movement resistance of lithium ions during charge and discharge is reduced, the impedance of the battery is lowered, lithium deposition is slowed down, and the cycle performance and lifespan of the battery are improved. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0036] Figure 1 It is a schematic structural diagram of the electrode tab provided in the embodiment of the present application;

[0037] Figure 2 For one implementation Figure 1 the D-D sectional view in;

[0038] Figure 3 It is a sectional view of the first active material layer;

[0039] Figure 4 For Figure 3 the enlarged view at A in;

[0040] Figure 5 It is a sectional view of the current collector;

[0041] Figure 6 is Figure 5 the enlarged view of part B in

[0042] Figure 7 the sectional view of the second active material layer;

[0043] Figure 8 is Figure 7 the enlarged view of part C in

[0044] Figure 9 the top view of the electrode plate under one implementation manner;

[0045] Figure 10 the top view of the electrode plate under another implementation manner;

[0046] Figure 11 the top view of the electrode plate under yet another implementation manner;

[0047] Figure 12 is for Figure 1 the sectional view D - D in

[0048] In Figures 1 - 12 :

[0049] 1 - current collector, 2 - active material layer, 3 - recessed part, 4 - hole, 5 - first raised part, 6 - third raised part, 7 - first flat part, 8 - second flat part, 9 - third flat part;

[0050] 21 - first active material layer, 22 - second active material layer, 31 - first recessed part, 32 - second recessed part, 33 - third recessed part, 41 - first hole, 42 - second hole, 43 - third hole. Specific implementation manners

[0051] This application provides an electrode plate. This application also provides a battery including the above - mentioned electrode plate.

[0052] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0053] As Figures 1 to 12As shown in the figure, an embodiment of the present application provides a pole piece. This pole piece can form a battery cell together with structures such as a separator. Structures such as the battery cell, electrolyte, and housing jointly form a battery. The pole piece mainly includes a current collector 1 and an active material layer 2 provided on at least one surface of the current collector 1. Exemplarily, the active material layer 2 can be provided on one side of the current collector 1, or the active material layer 2 can be provided on both sides of the current collector 1. The active material layer 2 and the current collector 1 are provided with a recess 3. By setting it like this, the recess 3 can accelerate the infiltration of the electrolyte and improve the liquid storage capacity; reduce the moving resistance when lithium ions move during charge and discharge, reduce the impedance of the battery, and slow down the lithium plating. At the same time, due to the setting of the recess 3, the heat dissipation area during the operation of the battery is physically increased, which can accelerate the dissipation of heat, reduce the possibility of material aging caused by high temperature, and extend the service life of the battery.

[0054] The active material layer 2 and the current collector 1 are provided with a plurality of recesses 3, and a flat part is formed between adjacent recesses 3; a hole 4 is also provided on the pole piece, and the hole 4 is provided in the recess 3 and / or the flat part. Specifically, on the basis of providing the recess 3 on the active material layer 2 and the current collector 1, a hole 4 is further provided on the pole piece. The hole 4 provided on the pole piece includes the active material layer 2 provided with the hole 4, or both the active material layer 2 and the current collector 1 are provided with the hole 4. By setting it like this, not only can the liquid storage capacity of the pole piece be enhanced and the liquid retention amount be improved, but also by enhancing the infiltration rate and degree of the electrolyte, the dynamic performance of lithium ion transmission is improved, thereby the risk of lithium plating in the battery can be solved and the rate performance can be improved. As for the setting position of the hole, it can be only provided in the recess 3 (as shown in Figure 9 ), or it can be only provided in the flat part (as shown in Figure 10 ), or it can be provided in both the recess 3 and the flat part (as shown in Figure 11 ).

[0055] It should be noted that the setting position of the recess 3 and the hole 4 on the active material layer 2 is not limited here. The hole 4 can be completely located in the recess 3, partially located in the recess 3, or misaligned with the recess 3.

[0056] It should also be noted that the recess 3 can be roll-pressed into the pole piece by a raised embossing roller when roll-pressing the active material layer 2 with a roller; or after roll-pressing the pole piece with a cylindrical roller, a raised component can be used to squeeze the pole piece to form the above-mentioned pole piece with the recess 3. The hole 4 provided on the active material and the current collector 1 can be punched by laser or other mechanical and physical methods. It should be noted again that the pole piece is not limited here, and the pole piece can be a positive pole piece or a negative pole piece.

[0057] The electrode sheet with the above structure is provided with a recess 3 between the active material layer 2 and the current collector 1, and a hole 4 is formed on the electrode sheet. By such setting, the flow path of the electrolyte is increased, the infiltration of the electrolyte is accelerated, and the liquid storage capacity is improved; the movement resistance of lithium ions during charge and discharge is reduced, the impedance of the battery is decreased, the lithium deposition is slowed down, and the cycle performance and lifespan of the battery are improved.

[0058] In some embodiments, the hole 4 is located within the recess 3, and the center of the hole 4 coincides with the center of the recess 3. Here, by disposing the hole 4 within the recess 3, the problem that the active material layer 2 within the recess 3 is extruded to result in a large compaction density can be alleviated. Generally, the recess 3 is formed by roll pressing with a roller component, so that the center of the recess 3 bears a greater roll pressure, which causes the compaction density of the active material at the center of the recess 3 of the active material layer 2 to be the largest. Thus, it is most difficult for the electrolyte to infiltrate at this position, and it is most difficult for the lithium ions located at this position to move during battery charging. In this embodiment, by making the center of the hole 4 coincide with the center of the recess 3, in this way, the infiltration degree and liquid storage amount of the battery can be further improved, and the movement efficiency of lithium ions during charging can be increased, thereby improving the fast charging efficiency of the battery.

[0059] In some embodiments, active material layers 2 are provided on both side surfaces of the current collector 1, which are the first active material layer 21 and the second active material layer 22 respectively. Among them: on one side surface of the first active material layer 21 away from the current collector 1, a first recess 31 is provided, and on the other side surface, a first protrusion 5 aligned with the first recess 31 is provided. And between adjacent first recesses 31 and between adjacent first protrusions 5 are all first flat portions 7; on one side surface of the second active material layer 22 close to the current collector 1, a second recess 32 is provided, and the other side surface is a plane, and between adjacent second recesses 32 are second flat portions 8; on one side surface of the current collector 1 close to the first active material layer 21, a third recess 33 is provided, and on the other side surface, a third protrusion 6 aligned with the third recess 33 is provided. And between adjacent third recesses 33 and between adjacent third protrusions 6 are all third flat portions 9. With such a setting, a recess 3 can be formed on one side surface of the first active material layer 21 of one side of the current collector 1 away from the current collector 1, and the other side of the second active material layer 22 on the other side of the current collector 1 away from the current collector 1 is a plane. With such a setting, the distribution of the active material layer 2 on the electrode sheet is relatively uniform, and the stability of the battery is better. And this is convenient for the production and shaping of the electrode sheet. Compared with the electrode sheet with recesses 3 provided on both sides, the deformation amount of the current collector 1 is smaller, and the deformation amount of the overall structure of the battery is not large, which can improve the energy density of the battery. Moreover, making one side of the electrode sheet have a recess and the other side be a plane. With such a setting, on the basis of realizing the purpose of storing liquid in the recess 3 and the hole 4, it can ensure good adhesion between the positive electrode sheet and the negative electrode sheet; and it can also avoid the formation of protrusions or sharp corners on the electrode sheet, avoiding piercing the diaphragm and causing a short circuit of the battery; and it can also reduce the thickness of the battery, thereby improving the energy density of the battery.

[0060] In some embodiments, the first active material layer 21 is provided with a first hole 41, and the first hole 41 communicates with the first recess 31 and the first protrusion 5; the current collector 1 is provided with a third hole 43, and the third hole 43 communicates with the third recess 33 and the third protrusion 6; among them, the first hole 41 communicates with the third hole 43. That is to say, the first hole 41 and the third hole 43 are blind holes formed on the electrode sheet (as Figure 12 shown). Setting the blind holes can store liquid better to increase the storage amount of the electrolyte in the electrode sheet; moreover, it can prevent the sharp part on the current collector 1 from protruding from the electrode sheet and prevent the sharp part of the current collector 1 from piercing the diaphragm to avoid the battery from short-circuiting.

[0061] On the basis of the above embodiments, further, the second active material layer 22 is provided with a second hole 42, and the second hole 42 communicates with the second recess 32 and the plane ( Figure 8 the surface shown as Q in). Among them, the first hole 41, the second hole 42 and the third hole 43 communicate with each other. That is to say, the hole 4 is a through hole in the direction perpendicular to the electrode sheet (as Figure 2As shown, with such a setting, the hole 4 penetrating the electrode sheet enables the electrolyte to directly move from one end of the electrode sheet to the other end, which can further improve the infiltration rate of the electrolyte. And in this way, the contact area between the active material layer 2 and the electrolyte can be increased, the movement efficiency of lithium ions during charge and discharge can be increased, and lithium can be slowly analyzed in this way.

[0062] It should be noted that the direction perpendicular to the electrode sheet refers to Figure 2 the direction indicated by the double-headed arrow P in

[0063] In some embodiments, the holes 4 and the recesses 3 are arranged one-to-one, and the holes 4 are located within the recesses 3. Specifically, since the recesses 3 are formed by roll-pressing the active material layer 2 with a grooved roller, the compaction density of the active material at the position where the recesses 3 are located is greater than that of the rest of the active material layer 2. Here, arranging the holes 4 and the recesses 3 one-to-one and the holes 4 being located within the recesses 3 can further improve the infiltration degree and storage amount of the electrolyte here, and does not affect the battery cycle performance and life.

[0064] Of course, multiple holes 4 can also be arranged within one recess 3, which can further improve the infiltration degree and liquid storage amount of the electrolyte in the recess 3 here.

[0065] It should be noted that during the processing and production of the electrode sheet, first use a grooved roller to roll-press the electrode sheet to form the recesses 3 on the surface of the active material layer 2 of the electrode sheet, and then drill the holes 4 within the recesses 3.

[0066] In some embodiments, both the recesses 3 and the holes 4 are arranged in an array. Specifically, the holes 4 and / or the recesses 3 are evenly formed on the active material layer 2, so that the active material content in each area of the electrode sheet is similar, which can improve the capacity of the electrode sheet, and can also improve the infiltration effect of the electrolyte, improve the movement efficiency of lithium ions during charging, achieve fast charging, and can slowly analyze lithium to improve the service life of the battery.

[0067] In addition, one of the holes 4 and the recesses 3 can be evenly formed on the active material layer 2 in an array arrangement, and the other can be not arranged in an array. In this way, to a certain extent, the infiltration effect of the electrolyte can also be improved, and lithium can be slowly analyzed. Of course, neither the holes 4 nor the recesses 3 need to be arranged in an array.

[0068] In some embodiments, the projection shape of the recesses 3 in the direction perpendicular to the electrode sheet is at least one of a circle, a square, a rhombus, an ellipse or a water droplet shape. Preferably, the shape is a circle or an ellipse without sharp corners, so as to avoid the sharp corners from piercing the separator and prevent the battery from short-circuiting; further preferably, it is a circle, so that it can be distributed more evenly on the surface of the electrode sheet, improve the consistency of the electrode sheet, and make the electrode sheet surface have similar chemical reactions when the battery works, further improving the stability and performance of the battery.

[0069] In some embodiments, the outer diameter of the first recess 31 is D1, the outer diameter of the second recess 32 is D2, and the outer diameter of the third recess 33 is D3, where D1, D2, and D3 satisfy: D1≥D2≥D3. Specifically, ensuring that the outer diameters of the first recess 31, the second recess 32, and the third recess 33 satisfy the above range can ensure the consistency of the structure of the recesses 3 on the electrode sheet, enabling similar electrochemical reaction rates on the battery surface and further improving the stability and performance of the battery.

[0070] It should be noted that when the cross-sectional shape of the recess 3 is circular, the outer diameter of the recess 3 refers to the diameter of the circle, and when the cross-sectional shape of the recess 3 is non-circular, the outer diameter of the recess 3 refers to the diameter of the circumscribed circle of the cross-sectional shape of the recess 3.

[0071] In some embodiments, in the direction perpendicular to the electrode sheet, the depth of the first recess 31 is L1, the depth of the second recess 32 is L2, and the depth of the third recess 33 is L3, where L1, L2, and L3 satisfy: L1≥L2≥L3. Specifically, ensuring that the depths of the first recess 31, the second recess 32, and the third recess 33 satisfy the above relationship can, on the basis of ensuring a certain liquid storage capacity of the electrode sheet, avoid excessive deformation of the electrode sheet and improve the energy density of the battery.

[0072] It should be noted that the ratio between any two of the depths of the first recess 31, the second recess 32, and the third recess 33 is greater than 0.8 and less than 1.2. Controlling within this range can ensure the consistency of the structure of the recesses 3 on the electrode sheet, enabling similar electrochemical reaction rates on the battery surface and further improving the stability and performance of the battery.

[0073] In some embodiments, the outer diameter of the hole 4 is d, and the outer diameter of the recess 3 is D, where D and d satisfy: 1.1≤D:d≤50. Specifically, if the ratio of the outer diameter of the recess 3 to the outer diameter of the hole 4 is too large, although the amount of electrolyte stored in the electrode sheet increases, the flow rate of the electrolyte through the liquid hole 4 decreases, and as the outer diameter of the recess 3 increases, phenomena such as cracking and powder shedding on the surface of the active layer are likely to occur; if the ratio of the outer diameter of the recess 3 to the outer diameter of the hole 4 is too small, although the flow rate of the electrolyte through the hole 4 increases, the amount of electrolyte stored in the recess 3 decreases, reducing the wettability of the electrolyte compared to the effect within the ratio range. In this embodiment, setting the ratio of the outer diameter of the recess 3 to the outer diameter of the hole 4 to satisfy the above range can improve the liquid storage capacity of the battery while ensuring the flow rate of the electrolyte and endowing the battery with a certain electrolyte wettability performance.

[0074] Exemplarily, the ratio between the outer diameter of the recess 3 and the outer diameter of the hole 4 can be 1.1, 1.5, 3, 5, 10, 15, 20, 30, 40, 45, 48, 50, etc.

[0075] It should be noted that when the hole 4 is a circular hole 4, the outer diameter of the hole 4 is the diameter of the hole 4; when the hole 4 is non-circular, the outer diameter of the hole 4 refers to the diameter of the circumscribed circle of the hole 4; when the cross-section of the recess 3 is circular, the outer diameter of the recess 3 is the diameter of the cross-sectional circle of the recess 3, and when the cross-section of the recess 3 is non-circular, the outer diameter of the recess 3 is the diameter of the circumscribed circle of the cross-sectional shape of the recess 3.

[0076] In some embodiments, the outer diameter of the recess 3 is D, where D satisfies: 1 mm ≤ D ≤ 5 mm; in the direction perpendicular to the electrode tab, the depth of the recess 3 is L, where L satisfies: 10 μm ≤ L ≤ 180 μm. Specifically, ensuring that the outer diameter and the depth of the recess 3 are within the above ranges can improve the liquid storage capacity of the battery and avoid the hole 4 in the recess 3 from being too deep, which can alleviate the problem of powder falling off in the active material layer 2.

[0077] Exemplarily, the outer diameter of the recess 3 can be 1 mm, 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 4.5 mm, 4.8 mm, 5 mm, etc.; the depth of the recess 3 can be 10 μm, 12 μm, 20 μm, 30 μm, 50 μm, 80 μm, 120 μm, 150 μm, 170 μm, 175 μm, 180 μm, etc.

[0078] In some embodiments, in the direction perpendicular to the electrode tab, the depth of the recess 3 is L, and the thickness of the active material layer 2 is M, where L and M satisfy: 1 ≤ L:M ≤ 2.5. Specifically, if the ratio of the depth of the recess 3 to the thickness of the active material layer 2 is too small and the depth of the recess 3 is too deep, it is easy to crack the active material layer 2 located in the recess 3 when drilling the hole 4 in the recess 3, and even expose the current collector 1 on the lower side of the active material layer 2 in the recess 3. The burrs generated during drilling 4 may pierce the separator, resulting in short circuit between the positive and negative electrodes; if the ratio of the depth of the recess 3 to the thickness of the active material layer 2 is too large and the depth of the recess 3 is too shallow, the ability of the recess 3 to store electrolyte is poor, and the infiltration efficiency of the electrolyte is low. Keeping the depth of the recess 3 and the thickness of the active material layer 2 within the above ranges can reduce the probability of short circuit between the positive and negative electrodes and ensure that the battery has a certain liquid storage capacity.

[0079] Exemplarily, the ratio between the depth of the recess 3 and the thickness of the active material layer 2 can be 1, 1.1, 1.2, 1.5, 1.8, 2, 2.2, 2.4, 2.5, etc.

[0080] In some embodiments, on the basis of drilling holes 4 in the recess 3, in the length direction of the electrode plate, the distance between adjacent recesses 3 is W1, and the outer diameter of the recess 3 is D, where the relationship between W1 and D satisfies: W1 ≥ 1.2 * D; and / or, in the width direction of the electrode plate, the distance between adjacent recesses 3 is W2, and the outer diameter of the recess 3 is D, where the relationship between W2 and D satisfies: W2 ≥ 1.2 * D. Specifically, if the distance between the recesses 3 is small, it will cause the active material layer 2 on the electrode plate to crack and powder easily, and too small a distance between the recesses 3 will also increase the number of drilled holes 4 and reduce the coated volume of the active material layer 2, affecting the energy density of the battery; if the distance between the recesses 3 is large, the effect of the battery in improving the liquid storage capacity is poor. Therefore, in the length direction and / or in the width direction of the electrode plate, making the distance between adjacent recesses 3 and the outer diameter of the recess 3 satisfy the above relationship can alleviate the problem of cracking and powdering of the active material layer 2, avoid excessive reduction of the energy density of the battery, and ensure that the battery has a certain liquid storage capacity.

[0081] It should be noted that the length direction of the electrode plate refers to Figure 9 the direction indicated by the double-headed arrow Y in Figure 9 it, and the width direction of the electrode plate refers to

[0082] In some embodiments, in the direction perpendicular to the electrode plate, the diameters of the first hole 41, the second hole 42, and the third hole 43 are the same. With this setting, when injecting electrolyte into the battery, it is convenient for the electrolyte to flow into the hole 4, improving the flow rate of the electrolyte in the hole 4 and facilitating the flow of the electrolyte, thereby improving the efficiency of the electrolyte wetting the battery.

[0083] In addition, in the direction perpendicular to the electrode plate, the diameters of at least any two of the first hole 41, the second hole 42, and the third hole 43 in the hole 4 may also be unequal, or in other words, the hole 4 may be a variable-diameter hole such as a tapered hole.

[0084] In some embodiments, the outer diameter of the hole 4 is d, where d satisfies: 0.1 mm ≤ d ≤ 4.5 mm. Exemplarily, d can be 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 3 mm, 4 mm, 4.2 mm, 4.4 mm, 4.5 mm, etc.

[0085] A battery including the above-mentioned electrode plate, since the electrode plate includes the above-mentioned battery, the beneficial effects brought by the electrode plate to the battery can be referred to the above content and will not be elaborated here.

[0086] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present application. Additionally, the specific details disclosed above are only for illustrative and facilitating understanding purposes and not limitations, and these details do not limit the present application to necessarily implement using the above specific details.

[0087] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present application are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended terms, meaning "including but not limited to", and can be used interchangeably with each other. The word "or" and "and" used herein refer to the word "and / or" and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to" and can be used interchangeably with it.

[0088] It should also be noted that in the devices, equipment, and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present application.

[0089] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0090] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth", and "sixth" used in the description of the embodiments of the present application are only for more clearly elaborating the technical solutions and cannot be used to limit the protection scope of the present application.

[0091] The above description has been given for purposes of illustration and description. Additionally, this description does not intend to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

Claims

1. A pole piece, characterized in that, It includes a current collector and an active material layer disposed on at least one surface of the current collector, wherein: A plurality of recesses are provided on the active material layer and the current collector, and a flat portion is formed between adjacent recesses; Holes are also formed in the electrode plate, and the holes are disposed in the recesses and / or the flat portions.

2. The pole piece according to claim 1, characterized in that, The hole is located within the recess, and the center of the hole coincides with the center of the recess.

3. The electrode tab according to claim 1 or 2, characterized in that, Active material layers are disposed on both surfaces of the current collector, and are respectively a first active material layer and a second active material layer, wherein: On one surface of the first active material layer away from the current collector, first recesses are provided, and on the other surface, first protrusions aligned with the first recesses are provided. Between adjacent first recesses and between adjacent first protrusions are first flat portions; On one surface of the second active material layer close to the current collector, second recesses are provided, and on the other surface is a flat surface. Between adjacent second recesses are second flat portions; On one surface of the current collector close to the first active material layer, third recesses are provided, and on the other surface, third protrusions aligned with the third recesses are provided. Between adjacent third recesses and between adjacent third protrusions are third flat portions.

4. The electrode plate according to claim 3, wherein The first active material layer is provided with first holes that communicate the first recesses and the first protrusions; The current collector is provided with third holes that communicate the third recesses and the third protrusions; Wherein, the first holes communicate with the third holes.

5. The electrode plate according to claim 4, wherein The second active material layer is provided with second holes that communicate the second recesses and the flat surface; Wherein, the first holes, the second holes and the third holes communicate with each other.

6. The pole piece according to claim 2, characterized in that, The holes and the recesses are arranged one-to-one, and both the recesses and the holes are arranged in an array.

7. The pole piece according to claim 1, characterized in that, The projected shape of the recess in the direction perpendicular to the electrode plate is at least one of a circle, a square, a rhombus, an ellipse or a water droplet shape.

8. The electrode tab according to claim 3, wherein The outer diameter of the first recess is D1, the outer diameter of the second recess is D2, and the outer diameter of the third recess is D3, where D1, D2 and D3 satisfy: D1≥D2≥D3.

9. The pole piece according to claim 3, wherein In the direction perpendicular to the electrode plate, the depth of the first recess is L1, the depth of the second recess is L2, and the depth of the third recess is L3, where L1, L2 and L3 satisfy: L1≥L2≥L3.

10. The pole piece according to claim 1, characterized in that, The outer diameter of the hole is d, and the outer diameter of the recess is D, where D and d satisfy: 1.1≤D:d≤50.

11. The electrode plate according to claim 1, wherein The outer diameter of the recess is D, where D satisfies: 1mm≤D≤5mm; In the direction perpendicular to the electrode plate, the depth of the recess is L, where L satisfies: 10μm≤L≤180μm.

12. The pole piece according to claim 1, wherein In the direction perpendicular to the electrode plate, the depth of the recess is L, and the thickness of the active material layer is M, where L and M satisfy: 1≤L:M≤2.

5.

13. The pole piece according to claim 1, wherein in the length direction of the pole piece, the distance between adjacent recessed portions is W1, and the outer diameter of the recessed portion is D, where W1 and D satisfy: W1 ≥ 1.2 * D; and / or, in the width direction of the pole piece, the distance between adjacent recessed portions is W2, and the outer diameter of the recessed portion is D, where W2 and D satisfy: W2 ≥ 1.2 * D.

14. The pole piece according to claim 5, characterized in that, In the direction perpendicular to the pole piece, the diameters of the first hole, the second hole, and the third hole are the same.

15. A battery, characterized in that, Comprising the pole piece according to any one of claims 1-14.

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