Pole piece and battery
By designing the pole sheet with guides, the problem of slow and uneven infiltration of the battery electrolyte is solved, and the rapid and uniform infiltration of the battery cell is achieved, and the safety and capacity of the battery are improved.
Patent Information
- Application Number
- CN202421337861.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-06-12
AI Technical Summary
During the battery production process, the electrolyte is slow to penetrate the battery cell through the electrode sheet, resulting in uneven infiltration of the battery cell, affecting the safety and capacity of the battery.
An electrode sheet is designed, including a base layer, an active material layer and a guide member. A storage tank is opened on the active material layer. The guide member is located in the storage tank and can be quickly immersed by the electrolyte, thereby guiding the electrolyte to rapidly immerse the electrode sheet.
By using such a pole sheet, the electrolyte can quickly and evenly soak the battery cell, improve the infiltration speed of the battery cell, and ensure the safety and capacity of the battery.
Smart Images
Figure CN222785297U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a pole piece and a battery. Background Art
[0002] During the battery production process, the battery cell needs to be infiltrated with electrolyte after the pole piece and the diaphragm are wound into a battery cell. However, when injecting electrolyte to infiltrate the battery cell, the speed at which the electrolyte infiltrates the battery cell through the pole piece is slow, and the infiltration speed at different positions of the battery cell is different, which easily leads to uneven infiltration of the battery cell, affecting the safety and capacity of the battery. Utility Model Content
[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a pole piece that can improve the problem of poor wetting and increase the wetting speed.
[0004] The present application also proposes a battery having the above-mentioned electrode sheet.
[0005] According to the first aspect of the present application, the pole piece includes a base layer, an active material layer and a guide member, and the base layer is set with a length direction, a width direction and a thickness direction; along the thickness direction, the active material layer is coated on at least one side of the base layer, and a receiving groove is opened on the active material layer on at least one side; the guide member is located in the receiving groove, and the guide member can be quickly infiltrated by the electrolyte to guide the electrolyte to infiltrate the pole piece.
[0006] The pole piece according to the embodiment of the present application has at least the following beneficial effects: a receiving groove is opened on the active material layer, and a guide piece is implanted, the guide piece can be quickly infiltrated by the electrolyte, and during the process of infiltrating the battery cell formed by winding the pole piece with the electrolyte, the electrolyte can quickly infiltrate from the guide piece to the surroundings of the pole piece, which helps to ensure that all parts of the battery cell are fully infiltrated and improve the infiltration speed of the battery cell.
[0007] According to some embodiments of the present application, the receiving groove extends along the length direction, and along the length direction, the length ratio of the guide member to the active material layer ranges from 0.15 to 1.
[0008] According to some embodiments of the present application, the accommodating groove extends along the length direction, and along the width direction, the width range of the guide member is 0.1 mm to 2 mm.
[0009] According to some embodiments of the present application, along the thickness direction, the thickness of the guide member is less than or equal to the thickness of the active material layer.
[0010] According to some embodiments of the present application, active material layers are coated on both sides of the base layer along the thickness direction, and receiving grooves are provided on the active material layers on both sides of the base layer, and the positions of the receiving grooves on the active material layers on both sides of the base layer correspond to each other.
[0011] According to some embodiments of the present application, the receiving groove extends along the length direction, and at least two receiving grooves are arranged on the active material layer along the width direction, and a guide member is provided in each receiving groove.
[0012] According to some embodiments of the present application, along the width direction, the middle of the receiving groove corresponds to the middle of the active material layer.
[0013] According to some embodiments of the present application, a receiving groove extending along the length direction and a receiving groove extending along the width direction are provided on the active material layer, and a guide member is accommodated in each of the receiving grooves.
[0014] According to some embodiments of the present application, the guide member is made of PP or fiber material.
[0015] A battery according to an embodiment of the second aspect of the present application comprises an anode sheet and a cathode sheet, wherein either the anode sheet or the cathode sheet is a pole sheet in any of the above embodiments;
[0016] Alternatively, the anode sheet and the cathode sheet are both the electrode sheets in any of the above embodiments, the guide members on the anode sheet and the cathode sheet are arranged correspondingly, and the guide member on the cathode sheet at the corresponding position can cover the guide member on the anode sheet;
[0017] The diaphragm is located between the anode and cathode sheets.
[0018] The battery according to the embodiment of the present application has at least the following beneficial effects: the anode sheet and the cathode sheet are separated by a diaphragm, and at least one of the anode sheet and the cathode sheet is the electrode sheet in any of the above embodiments, which can increase the speed at which the electrolyte infiltrates the battery cell, and when the anode sheet and the cathode sheet are both the electrode sheets in any of the above embodiments, the guide members on the anode sheet and the cathode sheet are arranged correspondingly, and the guide members on the cathode sheet at the corresponding positions can cover the guide members on the anode sheet, which is beneficial to improving the lithium plating problem of the battery and extending the service life of the battery.
[0019] According to some embodiments of the present application, along the length direction and / or along the width direction, the distance at which the edge of the guide on the cathode sheet exceeds the edge of the guide on the anode sheet is in the range of 0.1 mm to 1 mm.
[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:
[0022] Figure 1 This is a schematic diagram of the structure of the pole piece of the embodiment of the present application;
[0023] Figure 2 for Figure 1 Side view of
[0024] Figure 3 This is a schematic structural diagram of a pole piece according to another embodiment of the present application;
[0025] Figure 4 A cross-sectional view of a pole piece according to an embodiment of the present application;
[0026] Figure 5 for Figure 4 A local enlarged schematic diagram of the middle A;
[0027] Figure 6 This is a schematic diagram of the structure of a pole piece in another embodiment of the present application;
[0028] Figure 7 This is a schematic diagram of the structure corresponding to the receiving grooves on the anode sheet and the cathode sheet of the present application;
[0029] Figure 8 This is another structural schematic diagram corresponding to the receiving grooves on the anode sheet and the cathode sheet of the present application.
[0030] Reference numerals: base layer 100;
[0031] Active material layer 200, receiving tank 210;
[0032] A guide member 300;
[0033] Anode sheet 400;
[0034] Cathode sheet 500;
[0035] Diaphragm 600. DETAILED DESCRIPTION
[0036] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.
[0037] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.
[0038] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0039] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.
[0040] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0041] The following is an introduction to the embodiments of the present application in conjunction with the accompanying drawings:
[0042] refer to Figure 1 and Figure 2 According to the first aspect of the present application, the pole piece includes a base layer 100, an active material layer 200 and a guide member 300. The base layer 100 is used as a reference, and a length direction, a width direction and a thickness direction are set. Along the thickness direction, the active material layer 200 is coated on at least one side of the base layer 100, and a receiving groove 210 is opened on the active material layer 200 on at least one side. The guide member 300 is located in the receiving groove 210. The guide member 300 can be quickly infiltrated by the electrolyte. The setting of the guide member 300 can guide the electrolyte to quickly infiltrate the pole piece, thereby increasing the infiltration speed of the electrolyte into the pole piece.
[0043] In some embodiments, the base layer 100 may be a foil such as copper foil or aluminum foil. Along the thickness direction, one side of the base layer 100 is coated with an active material layer 200. A receiving groove 210 is provided on the active material layer 200. The receiving groove 210 extends along the length direction of the base layer 100. The guide member 300 is located in the receiving groove 210. Compared with the active material layer 200, the guide member 300 is easily infiltrated by the electrolyte. The electrolyte can diffuse from the guide member 300 to other positions of the electrode piece, which helps to increase the speed at which the electrolyte infiltrates the electrode piece.
[0044] refer to Figure 3 and Figure 4 In some embodiments, along the thickness direction of the base layer 100, both sides of the base layer 100 are coated with active material layers 200, and a receiving groove 210 is provided on the active material layer 200 on at least one side of the base layer 100. The active material layer 200 includes a receiving groove 210 extending along the length direction of the base layer 100 and a receiving groove 210 extending along the width direction of the base layer 100. A guide 300 is provided in the receiving groove 210. The guide 300 is easier to be infiltrated by the electrolyte than the active material, thereby helping to increase the speed of the electrolyte infiltrating the electrode. It should be understood that along the thickness direction of the base layer 100, the positions of the receiving grooves 210 on the active material layers 200 respectively located on both sides of the base layer 100 correspond to each other, which helps the electrolyte to infiltrate the electrode faster than the positions of the receiving grooves 210 on the active material layers 200 located on both sides of the base layer 100 do not correspond.
[0045] It should be noted that the positions of the receiving grooves 210 on the active material layer 200 on both sides of the base layer 100 correspond to each other, that is, along the thickness direction of the base layer 100, the projection of the receiving groove 210 on the active material layer 200 on the first side of the base layer 100 on the active material layer 200 on the second side of the base layer 100 can cover the receiving groove 210 on the active material layer 200 on the second side. The active material layer 200 may have a plurality of receiving grooves 210, each of which is provided with a guide 300, and the receiving groove 210 may be circular, square or other shapes, so as to better balance the battery capacity and the infiltration speed.
[0046] refer to Figure 1 and Figure 2 In some embodiments, a receiving groove 210 is provided on the active material layer 200, and the receiving groove 210 extends along the length direction of the base layer 100. The guide 300 is arranged in the receiving groove 210. Along the length direction of the base layer 100, the ratio of the length of the guide 300 to the length of the active material layer 200 is in the range of 0.15 to 1. Limiting the minimum ratio of the length of the guide 300 to the length of the active material layer 200 helps to retain more active materials while increasing the electrolyte infiltration speed, thereby ensuring the capacity of the battery. It should be understood that the guide 300 will occupy part of the space of the active material layer 200. The larger the ratio of the length of the guide 300 to the length of the active material layer 200, the less active material is contained in the pole piece, and the easier it is for the electrolyte to infiltrate the pole piece. Setting different ratios according to actual needs within the above ratio range is beneficial to better balance the electrolyte infiltration speed and battery capacity.
[0047] refer to Figure 1 and Figure 2In some embodiments, the receiving groove 210 extends along the length direction of the base layer 100, and along the width direction of the base layer 100, the width range of the guide member 300 is 0.1mm to 2mm. For example, the width of the guide member 300 can be 0.1mm, 0.25mm, 0.5mm, 0.75mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm or any other value within the range of 0.1mm to 2mm. It should be understood that the larger the width value of the guide member 300, the easier it is to guide the electrolyte to infiltrate the pole piece, so that the electrolyte infiltrates the pole piece faster and the pole piece is more uniform after being infiltrated. Accordingly, the guide member 300 will occupy the space of the active material layer 200. The wider the guide member 300 is, the less active material layer 200 the pole piece contains, and the content of the active material will affect the battery capacity. Therefore, the width of the guide member 300 should not be too large to ensure the battery capacity, and the width of the guide member 300 should not be too small to ensure the liquid guiding effect of the guide member 300. Limiting the width of the guide member 300 along the width direction of the base layer 100 helps to ensure the battery capacity while increasing the electrolyte infiltration speed.
[0048] refer to Figure 4 and Figure 5 In some embodiments, along the thickness direction of the base layer 100, the thickness of the guide member 300 is less than or equal to the thickness of the active material layer 200, which helps the receiving groove 210 on the active material layer 200 to accommodate the guide member 300, so that the electrode sheets in any of the above embodiments are wound into a battery cell, which can make the adjacent electrode sheets on the battery cell fit better and avoid being obstructed by the guide member 300, which is beneficial to improving the space utilization inside the battery to increase the battery capacity.
[0049] Along the thickness direction of the base layer 100, the thickness of the guide member 300 is less than the thickness of the active material layer 200. It should be understood that the receiving groove 210 will retain part of the space while accommodating the guide member 300. Compared with the guide member 300 and the active material layer 200 having the same thickness, the reserved part of the space can be used to accommodate the electrolyte, so that the electrolyte can infiltrate from the receiving groove 210 to various parts of the pole piece, thereby increasing the infiltration speed of the pole piece. Specifically, in the battery cell formed by winding the pole piece in any of the above embodiments, the electrolyte infiltrates from the outside of the battery cell to the inside of the battery cell, and the guide member 300 can guide the electrolyte to the receiving groove 210, and then infiltrate from the receiving groove 210 to various parts of the battery cell, which helps to increase the infiltration speed of the electrolyte.
[0050] In some embodiments, along the thickness direction of the base layer 100, the thickness of the active material layer 200 ranges from 0.1 mm to 0.3 mm. For example, the thickness of the active material layer 200 may be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, or any other value within the range of 0.1 mm to 0.3 mm. Along the thickness direction of the base layer 100, the thickness of the guide member 300 may be less than the thickness of the active material layer 200. For example, the thickness of the active material layer 200 is greater than 0.1 mm, and the thickness of the active material layer 200 is less than 0.3 mm. The thickness of the guide member 300 may be 0.1 mm less than the thickness of the active material layer 200, which helps to obtain a better electrolyte infiltration effect.
[0051] refer to Figure 4 and Figure 5 In some embodiments, along the thickness direction of the base layer 100, both sides of the base layer 100 are coated with active material layers 200, and receiving grooves 210 are provided on the active material layers 200 on both sides of the base layer 100, and the positions of the receiving grooves 210 on the active material layers 200 on both sides of the base layer 100 correspond to each other. A guide 300 is provided in the receiving groove 210 on the active material layer 200, and the guide 300 can guide the electrolyte to infiltrate the electrode. The receiving grooves 210 on the active material layers 200 on both sides of the base layer 100 correspond to each other, which is helpful to improve the infiltration speed of the electrolyte on the electrode compared with the staggered arrangement of the receiving grooves 210 on the active material layers 200 on both sides of the base layer 100.
[0052] It should be noted that the positions of the receiving grooves 210 on the active material layer 200 located on both sides of the base layer 100 correspond to each other, that is, along the thickness direction of the base layer 100, the projection of the receiving groove 210 on the active material layer 200 on the first side of the base layer 100 on the active material layer 200 on the second side of the base layer 100 can cover the receiving groove 210 on the active material layer 200 on the second side.
[0053] refer to Figure 6 In some embodiments, at least two receiving grooves 210 are provided on the active material layer 200 along the width direction of the base layer 100. The receiving grooves 210 extend along the length direction of the base layer 100. The receiving grooves 210 are spaced apart along the width direction of the base layer 100. A guide member 300 is provided in each receiving groove 210. It should be understood that along the width direction of the base layer 100, the width of the pole piece is large, and the pole piece is difficult to be wetted. By providing a plurality of receiving grooves 210 on the active material layer 200 to accommodate the guide member 300, the number of the receiving grooves 210 can be set according to the width of the pole piece, thereby reducing the difficulty of wetting the pole piece.
[0054] For example, along the width direction of the base layer 100, the active material layer 200 includes two spaced receiving grooves 210, the receiving grooves 210 extend along the length direction of the base layer 100, and the two receiving grooves 210 both include guides 300 to increase the speed at which the electrolyte infiltrates the electrode sheet. Specifically, along the width direction of the base layer 100, the two receiving grooves 210 can be respectively located at three equal parts of the active material layer 200, which helps to increase the infiltration speed of the electrolyte to the middle position on the electrode sheet that is more difficult to infiltrate, and improve the uniformity of the electrolyte infiltrating the electrode sheet.
[0055] refer to Figure 1 and Figure 2 In some embodiments, the receiving groove 210 extends along the length direction of the base layer 100. The active material layer 200 is provided with a receiving groove 210 along the width direction of the base layer 100, and the middle part of the receiving groove 210 corresponds to the middle part of the active material layer 200. For the battery cell formed by winding the above-mentioned electrode sheet, the middle part of the active material layer 200 on the battery cell corresponding to the active material layer 200 is difficult to be wetted. The receiving groove 210 is provided in the middle part of the active material layer 200 to accommodate the guide member 300, which can improve the problem of poor wetting in the middle part of the active material layer 200, facilitate sufficient wetting of the electrode sheet, and ensure the performance of the battery.
[0056] It should be noted that the middle part of the receiving groove 210 corresponds to the middle part of the active material layer 200. It should be understood that the receiving groove 210 extends along the length direction of the base layer 100, and along the width direction of the base layer 100, the middle position of the receiving groove 210 is the middle part of the receiving groove 210, and the middle position of the active material layer 200 is the middle part of the active material layer 200. The middle position of the receiving groove 210 and the middle position of the active material layer 200 are at the same position.
[0057] refer to Figure 3 In some embodiments, the active material layer 200 is provided with a receiving groove 210 extending along the length direction and a receiving groove 210 extending along the width direction. The receiving groove 210 contains a guide member 300. The guide member 300 has good electrolyte infiltration performance. After the electrode is wound, the guide member 300 can be infiltrated with the electrolyte faster than the active material on the active material layer 200. After the guide member 300 is infiltrated with the electrolyte, the active material layer 200 is infiltrated from the location of the guide member 300 as the infiltration starting point, which is beneficial to improving the overall infiltration speed of the electrode.
[0058] refer to Figure 1 and Figure 2It should be noted that the guide member 300 may be made of PP and / or fiber. PP and fiber have good electrolyte wetting performance. When a single receiving slot 210 is provided, the guide member 300 in the receiving slot 210 may be made of at least one of PP and fiber. When multiple receiving slots 210 are provided, the guide members 300 in different receiving slots 210 may be made of either PP or fiber, or may include both PP and fiber, which helps to increase the speed of electrolyte wetting the pole piece and the capacity of the battery after winding.
[0059] It should be noted that the manufacturing steps of the pole piece in any of the above embodiments are: implanting the guide member 300 at a position on the pole piece that is difficult to infiltrate, and then coating the active material layer 200 to manufacture the pole piece in any of the above embodiments. For example, along the width direction of the base layer 100, the middle part of the pole piece is difficult to infiltrate, and the guide member 300 is set in the middle part of the base layer 100, so that the guide member 300 is fixed on the base layer 100, and then the active material layer 200 is coated. Compared with coating the active material layer 200 first and then opening the receiving groove 210 to implant the guide member 300, it is possible to form the receiving groove 210 while coating the active material layer 200, which is beneficial to improving the production efficiency of the pole piece.
[0060] refer to Figure 7 According to the battery of the second embodiment of the present application, the anode sheet 400, the cathode sheet 500 and the separator 600 are included. The anode sheet 400 and the cathode sheet 500 are the electrodes in any of the above embodiments. The use of the above electrode sheets helps the electrolyte to quickly infiltrate the battery cell to produce the battery, thereby improving the production efficiency of the battery. The above electrode sheets help to ensure that the electrolyte fully infiltrates the interior of the battery, thereby ensuring that the battery capacity is fully utilized.
[0061] Specifically, a receiving groove 210 is provided on the active material layer 200 of one of the anode sheet 400 or the cathode sheet 500, and the receiving groove 210 extends along the length direction of the base sheet 100, and the receiving groove 210 contains a guide 300, which can guide the electrolyte to infiltrate the electrode sheet and increase the speed of the electrolyte infiltrating the battery. Compared with the receiving groove 210 provided on the anode sheet 400, the receiving groove 210 provided on the cathode sheet 500 can ensure that there is enough active material layer 200 on the anode sheet 400, so that when the battery is charged, the anode sheet 400 can better receive ions from the cathode sheet 500, which helps to improve the problem of lithium deposition in the battery and extend the service life of the battery.
[0062] In other embodiments, the battery includes an anode sheet 400, a cathode sheet 500 and a diaphragm 600, and the anode sheet 400 and the cathode sheet 500 are both the electrodes in any of the above-mentioned embodiments, and the position of the guide member 300 on the anode sheet 400 corresponds to the position of the guide member 300 on the cathode sheet 500, and at the corresponding position, the guide member 300 on the cathode sheet 500 can cover the guide member 300 on the anode sheet 400, so that the anode sheet 400 has a sufficient active material layer 200 to receive ions from the cathode sheet 500, so that during the battery charging process, the ions separated from the cathode sheet 500 can be embedded in the anode sheet 400, thereby improving the lithium plating problem of the battery and benefiting to extend the service life of the battery.
[0063] refer to Figure 7 In some embodiments, along the thickness direction of the base layer 100, the anode sheet 400 includes a base layer 100, one side of the base layer 100 of the anode sheet 400 is coated with an active material layer 200, the active material layer 200 is provided with a receiving groove 210, and the receiving groove 210 includes a guide member 300; the cathode sheet 500 also includes a base layer 100, one side of the base layer 100 of the cathode sheet 500 is coated with an active material layer 200, the active material layer 200 is provided with a receiving groove 210, and the receiving groove 210 includes a guide member 300. 10 includes a guide member 300; the side of the base layer 100 of the anode sheet 400 coated with the active material layer 200 is opposite to the side of the base layer 100 of the cathode sheet 500 coated with the active material layer 200, and the guide member 300 on the anode sheet 400 corresponds to the guide member 300 on the cathode sheet 500 in position, and the guide member 300 on the cathode sheet 500 can cover the guide member 300 on the anode sheet 400, thereby increasing the electrolyte infiltration speed and improving the lithium plating problem of the battery.
[0064] refer to Figure 8In some embodiments, along the thickness direction of the base layer 100, the anode sheet 400 includes a base layer 100, both sides of the base layer 100 are coated with active material layers 200, and the active material layers 200 on both sides of the base layer 100 are provided with receiving grooves 210, and the receiving grooves 210 contain guide members 300; the cathode sheet 500 also includes a base layer 100, both sides of the base layer 100 of the cathode sheet 500 are coated with active material layers 200, and the active material layers 200 on both sides of the base layer 100 are provided with guide members 300. The receiving groove 210 includes a guide 300, and the guide 300 on the anode sheet 400 is arranged corresponding to the position of the guide 300 on the cathode sheet 500. The guide 300 on the cathode sheet 500 can cover the guide 300 on the anode sheet 400 to improve the lithium precipitation problem and increase the infiltration speed of the electrolyte. It should be noted that the positions of the receiving grooves 210 on both sides of the base layer 100 of the anode sheet 400 can also be arranged correspondingly, which helps to further increase the infiltration speed of the electrolyte. Similarly, the positions of the receiving grooves 210 on both sides of the base layer 100 of the cathode sheet 500 can also be arranged correspondingly, which helps to further increase the infiltration speed of the electrolyte.
[0065] In other embodiments, along the thickness direction of the base layer 100, the anode sheet 400 includes a base layer 100, both sides of the base layer 100 are coated with active material layers 200, the active material layer 200 on one side of the base layer 100 is provided with a receiving groove 210, and the receiving groove 210 contains a guide member 300; the cathode sheet 500 includes a base layer 100, both sides of the base layer 100 are coated with active material layers 200, the active material layer 200 on one side of the base layer 100 is provided with a receiving groove 210, and the receiving groove 210 contains a guide member 300; the anode sheet 400 is arranged opposite to the side of the cathode sheet 500 where the receiving groove 210 is opened, and the guide member 300 on the anode sheet 400 is arranged corresponding to the position of the guide member 300 on the cathode sheet 500, and the guide member 300 on the cathode sheet 500 can cover the guide member 300 on the anode sheet 400, thereby improving the lithium plating problem and increasing the infiltration speed of the electrolyte.
[0066] In other embodiments, the anode sheet 400 includes a base layer 100, both sides of the base layer 100 are coated with active material layers 200, and the active material layer 200 on one side of the base layer 100 is provided with a receiving groove 210, and the receiving groove 210 contains a guide member 300; the cathode sheet 500 includes a base layer 100, both sides of the base layer 100 are coated with active material layers 200, and the active material layers 200 on both sides of the base layer 100 are provided with receiving grooves 210, and the active material layers 200 on both sides of the base layer 100 are provided with receiving grooves 210, and the active material layers 200 on both sides of the base layer 100 are provided with receiving grooves 210. The position of the receiving groove 210 on the active material layer 200 corresponds, and the receiving groove 210 contains a guide member 300; the receiving groove 210 on the anode sheet 400 is arranged corresponding to the receiving groove 210 on one side of the cathode sheet 500, and the guide member 300 on the anode sheet 400 can correspond to the position of the guide member 300 on the cathode sheet 500, and the guide member 300 on the cathode sheet 500 can cover the guide member 300 on the anode sheet 400, thereby improving the lithium plating problem and increasing the infiltration speed of the electrolyte.
[0067] In other embodiments, the anode sheet 400 includes a base layer 100, both sides of the base layer 100 are coated with active material layers 200, and the active material layers 200 on both sides of the base layer 100 are provided with receiving grooves 210, and the positions of the receiving grooves 210 on the active material layers 200 on both sides of the base layer 100 correspond to each other, and the receiving grooves 210 contain guide members 300; the cathode sheet 500 includes a base layer 100, both sides of the base layer 100 are coated with active material layers 200, and one of the base layers 100 is provided with a guide member 300; A receiving groove 210 is provided on the active material layer 200 on one side, and a guide member 300 is included in the receiving groove 210; the receiving groove 210 on the cathode sheet 500 is arranged corresponding to the receiving groove 210 on one side of the anode sheet 400, and the guide member 300 on the cathode sheet 500 can correspond to the position of the guide member 300 on the anode sheet 400, and the guide member 300 on the cathode sheet 500 can cover the guide member 300 on the anode sheet 400 at the corresponding position, which helps to increase the infiltration speed of the electrolyte.
[0068] refer to Figure 7 and Figure 8 In some embodiments, the guide member 300 on the cathode sheet 500 corresponds to the guide member 300 on the anode sheet 400, and the edge of the guide member 300 on the cathode sheet 500 exceeds the edge of the guide member 300 on the anode sheet 400 by a distance ranging from 0.1 mm to 1 mm along the length direction and / or along the width direction of the base layer 100, so that the guide member 300 on the cathode sheet 500 can cover the guide member 300 on the anode sheet 400, thereby helping to improve the lithium plating problem of the battery.
[0069] In some embodiments, along the width and length directions of the base layer 100, the edge of the guide member 300 on the cathode sheet 500 exceeds the edge of the guide member 300 on the anode sheet 400 by a distance in the range of 0.1 mm to 1 mm, and along the length direction of the base layer 100, the edge of the guide member 300 on the cathode sheet 500 exceeds the edge of the guide member 300 on the anode sheet 400 by a distance in the range of 0.1 mm to 1 mm, which helps the guide member 300 on the cathode sheet 500 to cover the guide member 300 on the anode sheet 400, so that the anode sheet 400 can better receive ions from the cathode sheet 500, which helps to improve the lithium plating problem of the battery and extend the service life of the battery.
[0070] It should be noted that limiting the maximum distance value of the edge of the guide member 300 on the cathode sheet 500 beyond the edge of the guide member 300 on the anode sheet 400 helps to retain more active material layers 200, so as to increase the infiltration speed of the electrolyte while ensuring the battery capacity. Limiting the minimum distance value of the edge of the guide member 300 on the cathode sheet 500 beyond the edge of the guide member 300 on the anode sheet 400 can ensure that there is enough active material layer 200 on the anode sheet 400 to receive ions on the cathode sheet 500 when the battery is charged, which helps to improve the lithium precipitation problem of the battery.
[0071] In other embodiments, along any direction of the width or length of the base layer 100, the edge of the guide member 300 on the cathode sheet 500 exceeds the edge of the guide member 300 on the anode sheet 400 by a distance in the range of 0.1 mm to 1 mm, and the guide member 300 on the cathode sheet 500 covers the guide member 300 on the anode sheet 400, so that the anode sheet 400 has a sufficient coating area of the active material layer 200 to receive ions from the cathode sheet 500, which helps to improve the lithium plating problem of the battery and extend the service life of the battery.
[0072] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
Claims
1. A pole piece, characterized in that: include: The base layer is set with a length direction, a width direction and a thickness direction; An active material layer, wherein the active material layer is coated on at least one side of the base layer along the thickness direction, and a receiving groove is provided on at least one side of the active material layer; The guide member is located in the receiving groove, and the guide member can be quickly infiltrated by the electrolyte to guide the electrolyte to infiltrate the pole piece.
2. The pole piece according to claim 1, characterized in that: The receiving groove extends along the length direction, and along the length direction, a length ratio of the guide member to the active material layer ranges from 0.15 to 1.
3. The pole piece according to claim 1, characterized in that: The receiving groove extends along the length direction, and along the width direction, the width of the guide member ranges from 0.1 mm to 2 mm.
4. The pole piece according to claim 1, characterized in that: Along the thickness direction, the thickness of the guide member is less than or equal to the thickness of the active material layer.
5. The pole piece according to claim 1, characterized in that: Along the thickness direction, the active material layer is coated on both sides of the base layer, and the receiving grooves are provided on the active material layers on both sides of the base layer, and the positions of the receiving grooves on the active material layers on both sides of the base layer correspond to each other.
6. The pole piece according to claim 1, characterized in that: The receiving groove extends along the length direction. Along the width direction, at least two receiving grooves are arranged on the active material layer at intervals, and the guide member is arranged in each receiving groove.
7. The pole piece according to claim 1, characterized in that: Along the width direction, a middle portion of the receiving groove corresponds to a middle portion of the active material layer.
8. The pole piece according to claim 1, characterized in that: The active material layer is provided with the receiving groove extending along the length direction and the receiving groove extending along the width direction, and the guide member is received in each of the receiving grooves.
9. A battery, characterized in that: include: An anode sheet and a cathode sheet, wherein either the anode sheet or the cathode sheet is the electrode sheet according to any one of claims 1 to 8; Alternatively, the anode sheet and the cathode sheet are both the electrode sheets according to any one of claims 1 to 8, the anode sheet and the guide members on the cathode sheet are arranged correspondingly, and the guide members on the cathode sheet at corresponding positions can cover the guide members on the anode sheet; The separator is located between the anode plate and the cathode plate.
10. The battery according to claim 9, characterized in that Along the length direction and / or along the width direction, the distance where the edge of the guide member on the cathode sheet exceeds the edge of the guide member on the anode sheet is in the range of 0.1 mm to 1 mm.