Pole piece structure and battery
By designing the guide area and guides in the pole sheet structure, the problem that the electrolyte is difficult to immerse the inside of the battery cell is solved, and the battery's infiltration speed and capacity are improved.
Patent Information
- Application Number
- CN202421037206.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-05-13
AI Technical Summary
During the battery production process, the electrolyte is slow to infiltrate the battery cell through the electrode sheet, especially the inside of the battery cell is difficult to infiltrate, resulting in poor infiltration and affecting the safety and capacity of the battery.
A pole sheet structure is designed, including a base layer, an active material layer and a guide member. A guide area is provided on the active material layer, and a receiving tank is opened in the guiding area. The guide member is located in the receiving tank and can be quickly immersed by the electrolyte to guide the electrolyte to infiltrate the electrode sheet.
By setting up guides, the speed and uniformity of the electrolyte infiltrating the electrode sheet are improved, the problem of difficulty in infiltrating inside the battery cell is solved, and the production efficiency and capacity performance of the battery are improved.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a pole piece structure and a battery. Background Art
[0002] In the battery production process, after the pole piece and the diaphragm are wound into a battery cell, the battery cell needs to be infiltrated with electrolyte to stimulate battery performance. 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, especially the inside of the battery cell is difficult to infiltrate, which is prone to poor infiltration, 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 structure that can improve the poor wetting of the battery cell, especially the problem of the difficulty in wetting the core of the battery cell, and increase the wetting speed of the battery cell.
[0004] The present application also proposes a battery having the above-mentioned electrode structure.
[0005] According to the pole piece structure of the embodiment of the first aspect of the present application, it includes a base layer, an active material layer and a guide member, the base layer is set with a length direction, a width direction and a thickness direction, the base layer includes a winding starting end and a winding ending end; along the thickness direction, the active material layer is coated on at least one side of the base layer, along the length direction, a guide area is provided on the active material layer, a receiving groove is opened in the guide area, the edge of the guide area is spaced from the winding starting end, the edge of the guide area is spaced from the winding ending end, and the receiving groove extends along the width direction; the guide member is located in the receiving groove, the guide member can be quickly infiltrated by the electrolyte to guide the electrolyte to infiltrate the pole piece.
[0006] The electrode structure according to the embodiment of the present application has at least the following beneficial effects: a guide area containing a guide member is set on the active material layer, and the guide area can correspond to a difficult-to-wet area inside the battery cell after the electrode is wound to form a battery cell, and the guide member can be quickly infiltrated by the electrolyte, and is used to guide the electrolyte to infiltrate the interior of the battery cell, which is beneficial to improving the speed and uniformity of the electrolyte infiltrating the battery cell.
[0007] According to some embodiments of the present application, along the width direction, the ratio of the length of the guide member to the width of the active material layer ranges from 0.1 to 1.
[0008] According to some embodiments of the present application, along the length direction, the width of the guide member ranges from 0.1 mm to 1 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, receiving grooves are provided on the active material layers located on both sides of the base layer along the thickness direction, and the positions of the receiving grooves on the active material layers located on both sides of the base layer correspond to each other.
[0011] According to some embodiments of the present application, at least two receiving grooves are spaced apart on the active material layer along the length direction, and the spacing distance between adjacent receiving grooves increases successively from the starting end to the ending end of the winding, and a guide member is provided in each receiving groove.
[0012] According to some embodiments of the present application, along the length direction, a ratio a of the length of the guide region to the length of the active material layer is in the range of 0<a≤0.5.
[0013] According to some embodiments of the present application, the guide member is made of PP and / or fiber material.
[0014] A battery according to an embodiment of the second aspect of the present application comprises an anode sheet, a cathode sheet and a separator, wherein either the anode sheet or the cathode sheet is a pole sheet structure in any of the above embodiments;
[0015] Alternatively, the anode sheet and the cathode sheet are both the electrode sheet structures in any of the above embodiments, and the guide members on the anode sheet and the cathode sheet can be correspondingly arranged at the flat part of the battery cell, and the guide member on the cathode sheet can cover the guide member on the anode sheet at the corresponding position;
[0016] The diaphragm is located between the anode and cathode sheets.
[0017] The battery according to the embodiment of the present application has at least the following beneficial effects: when the anode sheet and the cathode sheet are both the electrode sheet structures in any of the above embodiments, the speed and uniformity of the electrolyte infiltrating the battery cell can be increased, thereby improving the production efficiency of the battery and ensuring the capacity of the battery. When the anode sheet and the cathode sheet are both the electrode sheet structures in any of the above embodiments, the guide on the cathode sheet can cover the guide on the anode sheet, so that there is enough active material layer on the anode sheet to receive ions from the cathode sheet, thereby improving the lithium precipitation problem of the battery and extending the service life of the battery.
[0018] According to some embodiments of the present application, along the length direction and / or along the width direction, the edge of the guide on the cathode sheet exceeds the edge of the guide on the anode sheet by a distance in the range of 0.1 mm to 1 mm.
[0019] 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
[0020] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:
[0021] Figure 1 This is a schematic diagram of the structure of the pole piece of an embodiment of the present application;
[0022] Figure 2 for Figure 1 Sectional view at AA in the middle;
[0023] Figure 3 This is a cross-sectional view of a pole piece structure in an embodiment of the present application with a receiving groove opened on one side;
[0024] Figure 4 This is a cross-sectional view of a pole piece structure in an embodiment of the present application with accommodation grooves opened on both sides;
[0025] Figure 5 This is a cross-sectional view of the pole piece structure when the thickness of the guide member in the embodiment of the present application is smaller than that of the active material layer.
[0026] Figure 6 A schematic diagram of a pole piece structure according to another embodiment of the present application;
[0027] Figure 7 A partial cross-sectional view of a battery according to an embodiment of the present application;
[0028] Figure 8 This is a partial cross-sectional view of a battery according to another embodiment of the present application.
[0029] Reference numerals: base layer 100, winding start end 110, winding end 120;
[0030] Active material layer 200, receiving groove 210, guiding area 220;
[0031] A guide member 300;
[0032] Anode sheet 400;
[0033] Cathode sheet 500;
[0034] Diaphragm 600. DETAILED DESCRIPTION
[0035] 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.
[0036] 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.
[0037] 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.
[0038] 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.
[0039] 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.
[0040] The following is an introduction to the embodiments of the present application in conjunction with the accompanying drawings:
[0041] refer to Figures 1 to 4According to the pole piece structure of the embodiment of the first aspect of the present application, it includes a base 100, an active material layer 200 and a guide member 300. The base 100 is used as a reference, and a length direction, a width direction and a thickness direction are set, and the base 100 includes a winding starting end 110 and a winding ending end 120. Along the thickness direction of the base 100, at least one side of the base 100 is coated with the active material layer 200, and a guide area 220 is provided on the active material layer 200. A receiving groove 210 is opened in the guide area 220 of the active material layer 200. Along the length direction of the base 100, the edge of the guide area 220 close to the winding starting end 110 is spaced from the winding starting end 110, and the edge of the guide area 220 close to the winding ending end 120 is spaced from the winding ending end 120. The receiving groove 210 on the guide area 220 extends along the width direction of the base 100. The guide member 300 is placed in the above-mentioned receiving groove 210, and the guide member 300 can be quickly infiltrated by the electrolyte to guide the electrolyte to infiltrate the electrode structure. Therefore, by providing the guide member 300, the speed of the electrolyte infiltrating the electrode structure can be increased. After the electrode structure is wound into a battery cell, the position of the guide area 220 corresponds to the inside of the battery cell, which is convenient for fully infiltrating the inside of the battery cell.
[0042] It should be noted that along the length direction of the base layer 100, the pole ear is located at the end of the base layer 100 where the winding starting end 110 is located. After the pole piece structure is wound into a battery cell, the winding starting end 110 is located inside the battery cell, and the winding ending end 120 is located outside the battery cell. The electrolyte infiltrates the battery cell from the outside of the battery cell to the inside of the battery cell.
[0043] Specifically, along the length direction of the base 100, the length ratio a of the guide area 220 to the active material layer 200 is in the range of 0<a≤0.5. For example, when the length ratio a of the guide area 220 to the active material layer 200 is 0.5, along the length direction of the base 100, the edge of the guide area 220 of the pole piece structure near the winding starting end 110 and the coating edge of the active material layer 200 have a first interval b, and the edge of the guide area 220 of the pole piece structure near the winding ending end 120 and the coating edge of the active material layer 200 have a second interval c, the first interval b and the second interval c can be equal, and along the length direction of the base 100, the first interval b and the second interval c each occupy 25% of the total length of the active material layer 200, and a receiving groove 210 is opened in the guide area 220, the receiving groove 210 extends along the width direction of the base 100, and the guide member 300 is located in the receiving groove 210. Therefore, after the electrode structure is wound, along the thickness direction of the base layer 100, the guide area 220 on the active material layer 200 can correspond to 25% to 75% of the total thickness of the battery cell, so that the thickness of the battery cell containing the guide member 300 occupies 50% of the total thickness of the battery cell, thereby increasing the speed at which the electrolyte infiltrates into the interior of the battery cell.
[0044] In some embodiments, the base layer 100 may be a foil material such as copper foil or aluminum foil. An active material layer 200 is coated on one side of the base layer 100 along the thickness direction. A receiving groove 210 is provided at a guide area 220 on the active material layer 200. The receiving groove 210 extends along the width 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, and can guide the electrolyte to infiltrate the electrode structure, thereby increasing the infiltration speed of the electrolyte.
[0045] In other embodiments, the base layer 100 may be a foil material such as copper foil or aluminum foil. An active material layer 200 is coated on both sides of the base layer 100 along the thickness direction. A receiving groove 210 is provided in the guide area 220 on the active material layer 200 on one side of the base layer 100. The receiving groove 210 extends along the width 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, and can guide the electrolyte to infiltrate the electrode structure, thereby increasing the infiltration speed of the electrolyte.
[0046] refer to Figure 1 and Figure 2 In some embodiments, a receiving groove 210 is provided at the guide area 220 on the active material layer 200, and the guide member 300 is arranged in the receiving groove 210. Along the width direction of the base layer 100, the ratio of the length of the guide member 300 to the width of the active material layer 200 is in the range of 0.1 to 1. Limiting the minimum width ratio of the length of the guide member 300 to 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 larger the ratio of the length of the guide member 300 to the width of the active material layer 200, the larger the space occupied by the guide member 300 in the guide area 220, and the easier it is for the electrolyte to infiltrate the pole piece structure. 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, along the length direction of the base layer 100, the width of the guide member 300 ranges from 0.1 mm to 1 mm. For example, the width of the guide member 300 can be 0.1 mm, 0.25 mm, 0.5 mm, 0.75 mm, 1 mm, or any other value within the range of 0.1 mm to 1 mm. It should be understood that the wider the guide member 300 is, the easier it is to guide the electrolyte to infiltrate the electrode structure, so that the electrolyte infiltrates the electrode structure faster, and within a certain infiltration time, the uniformity of the electrode structure after infiltration is better. At the same time, the wider the guide member 300 is, the less active material contained in the active material layer 200 will be, and the active material content in the active material layer 200 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 helps to ensure the battery capacity while increasing the electrolyte infiltration speed.
[0048] refer to 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, so that the receiving groove 210 on the active material layer 200 can completely accommodate the guide member 300, so that the electrode structure is wound to form a battery cell, and the active material layers 200 located on adjacent electrode structures on the battery cell can 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] In some embodiments, 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 guide member 300 is placed in the receiving groove 210, and the receiving groove 210 can reserve part of the space. Compared with the guide member 300 and the active material layer 200 having the same thickness, the thickness of the guide member 300 is less than the thickness of the active material layer 200, which can reserve part of the space of the receiving groove 210. The part of the space reserved in the receiving groove 210 can be used to accommodate the electrolyte, so that the electrolyte can infiltrate from the receiving groove 210 to various parts of the electrode structure, thereby increasing the infiltration speed of the electrolyte.
[0050] Specifically, the electrode structure can form a battery cell after winding, and the electrolyte infiltrates from the outside of the battery cell to the inside of the battery cell. The guide 300 can guide the electrolyte to the receiving tank 210 for temporary storage, and the electrolyte then infiltrates from the receiving tank 210 to various parts of the battery cell, which helps to increase the infiltration speed of the electrolyte.
[0051] It should be noted that, 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 is 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.
[0052] 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 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 member 300 is provided in the receiving groove 210, and the guide member 300 can guide the electrolyte to infiltrate the electrode structure. 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, which is compared with the staggered arrangement of the positions of the receiving grooves 210 on the active material layers 200 on both sides of the base layer 100, which helps to further improve the infiltration speed of the electrolyte on the electrode structure.
[0053] It should be noted that 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, 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.
[0054] refer to Figure 6 In some embodiments, along the length direction of the base layer 100, the active material layer 200 has a guide area 220, and at least two receiving grooves 210 are arranged on the guide area 220 at intervals. From the winding starting end 110 to the winding ending end 120, the spacing distance between adjacent receiving grooves 210 increases successively, and each receiving groove 210 is provided with a guide member 300, so that after the pole piece structure is wound into a battery cell, along the thickness direction of the base layer 100, each receiving groove 210 can be located on the same vertical line of the battery cell, which is beneficial to improve the infiltration speed of the electrolyte.
[0055] refer to Figures 6 to 8For example, along the length direction of the base layer 100, from the winding starting end 110 to the winding ending end 120, the intervals between the spaced accommodating grooves 210 are d, e, f, and g respectively, and the values of d, e, f, and g increase successively. Each accommodating groove 210 is located in the guide area 220, and the pole piece can be wound to form a battery cell. Along the thickness direction of the base layer 100, each accommodating groove 210 is located on the same vertical line, which is convenient for fully infiltrating the interior of the battery cell.
[0056] Specifically, along the length direction of the base layer 100, a guide area 220 is provided on the active material layer 200, and the length of the guide area 220 accounts for 50% of the total length of the active material layer 200, and the distance between the starting point of the guide area 220 and the winding starting end 110 accounts for 25% of the total length of the active material layer 200, and the distance between the end point of the guide area 220 and the winding ending end 120 accounts for 25% of the total length of the active material layer 200. At least two receiving grooves 210 are provided on the guide area 220, and the receiving grooves 210 contain guide members 300. From the winding starting end 110 to the winding ending end 120, the spacing distance between adjacent receiving grooves 210 increases successively, so that after the pole piece structure is wound into a battery cell, the receiving grooves 210 are located on the flat part of the battery cell, and along the thickness direction of the base layer 100, each receiving groove 210 is correspondingly arranged on the same vertical line of the battery cell. It should be understood that when the electrode structure is wound into a battery cell, the winding radius will gradually increase. After the battery cell is wound, along the thickness direction of the base layer 100, the thickness of the battery cell including the guide area 220 accounts for 50% of the total thickness of the battery cell, which is convenient for the electrolyte to infiltrate the interior of the battery cell and improves the uniformity of the electrolyte infiltration into the battery cell. Compared with setting the receiving groove 210 on the entire active material layer 200, it is beneficial to ensure the capacity of the battery while increasing the electrolyte infiltration speed.
[0057] refer to Figure 1 In some embodiments, a guide area 220 is provided on the active material layer 200, and a plurality of receiving grooves 210 are located in the guide area 220. Each receiving groove 210 includes a guide member 300. Each receiving groove 210 extends along the width direction of the base layer 100, and there is a gap between each receiving groove 210 along the length direction of the base layer 100. Providing a plurality of receiving grooves 210 helps to increase the infiltration speed of the electrolyte.
[0058] Specifically, along the width direction of the base layer 100, different receiving grooves 210 may have different extension lengths. Along the length direction of the base layer 100, there are intervals between the receiving grooves 210. Along the width direction of the base layer 100, there may also be intervals between the receiving grooves 210. The guide members 300 are arranged at intervals, which helps to retain more active materials on the active material layer 200 while taking into account the effect of the guide members 300 in guiding the electrolyte infiltration.
[0059] refer to Figures 1 to 6In some embodiments, 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 structure and maximize the capacity of the battery after winding.
[0060] It should be noted that the manufacturing steps of the pole piece structure in any of the above embodiments are: implanting the guide member 300 at a position on the base layer 100 that is difficult to infiltrate, and then coating the active material layer 200 on the base layer 100 to form the pole piece structure in any of the above embodiments. For example, an implantation area is preset on the base layer 100, and the guide member 300 is implanted in the implantation area on 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 to form the pole piece structure. 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 structure.
[0061] refer to Figures 6 to 8 According to the battery of the second embodiment of the present application, the battery includes an anode sheet 400, a cathode sheet 500 and a separator 600. Either the anode sheet 400 or the cathode sheet 500 is a pole sheet structure in any of the above embodiments. The use of the above pole sheet structure helps the electrolyte to quickly infiltrate the battery cell, reduces the time for the electrolyte to completely infiltrate the battery cell, and improves the production efficiency of the battery. The use of the above pole sheet structure helps to ensure that the electrolyte fully infiltrates the interior of the battery and ensures that the battery capacity is fully utilized.
[0062] Specifically, one of the anode sheet 400 or the cathode sheet 500 is a pole sheet structure in any of the above embodiments, and a receiving groove 210 is provided in the guide area 220 on the active material layer 200 of the pole sheet structure, and the receiving groove 210 extends along the width direction of the base layer 100, and the receiving groove 210 contains a guide member 300, and the guide member 300 can guide the electrolyte to infiltrate the pole sheet, thereby increasing the speed at which the electrolyte infiltrates 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 more active materials are retained on the anode sheet 400, and 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 prolong the service life of the battery.
[0063] 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.
[0064] It should be noted that 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, that is, along the thickness direction of the base layer 100, the projection of the guide member 300 on the anode sheet 400 on the cathode sheet 500 can cover the receiving groove 210 on the cathode sheet 500.
[0065] refer to Figures 6 to 8 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, and the active material layer 200 is provided with a receiving groove 210 extending along the width direction of the base layer 100, 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, and the active material layer 200 is provided with a receiving groove 210 extending along the width direction of the base layer 100. An extended receiving groove 210 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.
[0066] refer to Figures 6 to 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 extending along the width direction of the base layer 100, 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 extends along the width direction of the base layer 100, and the receiving groove 210 contains a guide 300. 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 anode sheet 400 and the base layer 100 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 cathode sheet 500 and the base layer 100 can also be arranged correspondingly, which helps to further increase 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 an active material layer 200, and the active material layer 200 on one side of the base layer 100 is provided with a receiving groove 210 extending along the width direction of the base layer 100, 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 an active material layer 200, and the active material layer 200 on one side of the base layer 100 is provided with a receiving groove 210 extending along the width direction of the base layer 100. A receiving groove 210 extending along the width direction of the base layer 100 is provided, and a guide member 300 is included in the receiving groove 210; the anode sheet 400 and the cathode sheet 500 are arranged opposite to each other on the side 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.
[0068] 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 extending along the width direction of the base layer 100, 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 extending along the width direction of the base layer 100. 10, and 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, and the receiving grooves 210 contain guide members 300; the receiving grooves 210 on the anode sheet 400 are arranged corresponding to the receiving grooves 210 on one side of the cathode sheet 500, and the guide members 300 on the anode sheet 400 can correspond to the positions of the guide members 300 on the cathode sheet 500, and the guide members 300 on the cathode sheet 500 can cover the guide members 300 on the anode sheet 400, thereby improving the lithium plating problem and increasing the infiltration speed of the electrolyte.
[0069] 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 extending along the width direction 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, 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 the base layer 100 wherein A receiving groove 210 extending along the width direction of the base layer 100 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.
[0070] It should be noted that a guide area 220 is provided on the active material layer 200. After the electrode is wound into a battery cell, the guide area 220 is located inside the battery cell. The interior of the battery cell is not easy to be infiltrated, and poor infiltration is prone to occur. By implanting a guide member 300 in the receiving groove 210 of the guide area 220, the infiltration speed of the electrolyte can be accelerated when passing through the guide area 220, which is beneficial to the full infiltration of the interior of the battery cell.
[0071] refer to Figure 6 Zhihe Figure 8In 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.
[0072] 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.
[0073] 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.
[0074] 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.
[0075] 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 structure, characterized in that: include: The base layer is set with a length direction, a width direction and a thickness direction, and the base layer includes a winding start end and a winding end end; An active material layer, wherein the active material layer is coated on at least one side of the base layer along the thickness direction, a guide area is provided on the active material layer along the length direction, a receiving groove is provided in the guide area, an edge of the guide area is spaced from the winding start end, an edge of the guide area is spaced from the winding end end, and the receiving groove extends along the width direction; 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 structure according to claim 1, characterized in that: Along the width direction, the ratio of the length of the guide member to the width of the active material layer is in the range of 0.1 to 1.
3. The pole piece structure according to claim 1, characterized in that: Along the length direction, the width of the guide member ranges from 0.1 mm to 1 mm.
4. The pole piece structure 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 structure according to claim 1, characterized in that: Along the thickness direction, the receiving grooves are provided on the active material layers respectively located on both sides of the base layer, and the positions of the receiving grooves on the active material layers respectively located on both sides of the base layer correspond to each other.
6. The pole piece structure according to claim 1, characterized in that: Along the length direction, at least two receiving grooves are spaced apart on the active material layer, and the spacing distance between adjacent receiving grooves increases successively from the winding starting end to the winding ending end, and the guide member is provided in each receiving groove.
7. The pole piece structure according to claim 1, characterized in that: Along the length direction, a ratio a of the length of the guide area to the length of the active material layer is in the range of 0<a≤0.
5.
8. The pole piece structure according to claim 1, characterized in that: The guide piece is made of PP and / or fiber material.
9. A battery, characterized in that: include: An anode sheet and a cathode sheet, wherein either the anode sheet or the cathode sheet is a pole sheet structure as claimed in any one of claims 1 to 8; Alternatively, the anode sheet and the cathode sheet are both the electrode sheet structures according to any one of claims 1 to 8, the guide members on the anode sheet and the cathode sheet can be arranged correspondingly at the flat part of the battery cell, and the guide member on the cathode sheet can cover the guide member on the anode sheet at the corresponding position; 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 by which the edge of the guide member on the cathode sheet exceeds the edge of the guide member on the anode sheet is in a range of 0.1 mm to 1 mm.