Battery cell, battery, and electric device

Abstract

The utility model discloses a kind of electric core, battery and electric equipment, the electric core includes: pole piece and diaphragm, the pole piece includes current collector, dressing layer and adhesive layer, the dressing layer and the adhesive layer are located the same side of current collector along first direction, the adhesive layer is located at the dressing layer at least one side along second direction, the first direction intersects with the second direction;The diaphragm includes base film and inorganic coating, part of the base film is provided with inorganic coating to define white space part at the edge of the base film, in the first direction, the inorganic coating is arranged corresponding to the dressing layer, the white space part is arranged corresponding to the adhesive layer, the adhesive layer is connected with the white space part by adhesive. Thus, it is beneficial to reduce cost, and the size of electric core can be reduced, the energy density is improved, and more gap channels can be provided for electrolyte, which is more conducive to electrolyte infiltration.

Description

Technical Field

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

[0002] With the booming development of the new energy vehicle industry in recent years, higher demands have been placed on the manufacturing process and energy density of power batteries. After the positive electrode, separator, and negative electrode are stacked, the battery cells are prone to loosening and misalignment, leading to low process yield. In lithium battery structures, to solve the problem of loosening and misalignment, an adhesive layer is usually coated on the surface of the separator. This adhesive layer bonds the separator to the electrode, ensuring adhesion between the separator and the electrode. However, this arrangement is costly and has low energy density, leaving room for improvement. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery cell that has low cost, high energy density, and is beneficial for electrolyte wetting.

[0004] A battery cell according to an embodiment of the present invention includes: an electrode sheet, the electrode sheet including a current collector, a coating layer and an adhesive layer, the coating layer and the adhesive layer being disposed on the same side of the current collector along a first direction, the adhesive layer being located on at least one side of the coating layer along a second direction, the first direction intersecting the second direction; and a separator, the separator including a base film and an inorganic coating, a portion of the base film having an inorganic coating to define a blank portion at the edge of the base film, the inorganic coating being disposed correspondingly to the coating layer in the first direction, the blank portion being disposed correspondingly to the adhesive layer, and the adhesive layer being adhesively bonded to the blank portion.

[0005] According to the embodiment of the present invention, the battery cell has an adhesive layer on the current collector and a corresponding blank area on the base film, which allows the adhesive layer to directly connect the current collector and the base film, thereby achieving a stable connection between the electrode and the separator. This eliminates the need for an adhesive structure between the coating layer and the inorganic coating, which helps to reduce costs, reduce the size of the battery cell, increase energy density, and provide more gap channels for the electrolyte, which is more conducive to electrolyte wetting.

[0006] According to some embodiments of the present invention, the adhesive layer is provided on both sides of the dressing layer along the second direction in the battery cell.

[0007] According to some embodiments of the present invention, the dimension of the adhesive layer along the second direction is L1, and the dimension of the blank portion along the second direction is L2, satisfying: 0.6≤L2 / L1≤2.

[0008] According to some embodiments of the present invention, the size L1 of the adhesive layer along the second direction ranges from 1mm to 20mm; and / or the size L2 of the blank portion along the second direction ranges from 1mm to 50mm.

[0009] According to some embodiments of the present invention, the adhesive layer has a dimension of H1 along the first direction, and the dressing layer has a dimension of H2 along the first direction, satisfying: 0.3≤H1 / H2≤1.5.

[0010] According to some embodiments of the present invention, the size H1 of the dressing layer along the first direction ranges from 30μm to 150μm.

[0011] According to some embodiments of the present invention, in the battery cell, the dimension of the coating layer along the second direction is less than or equal to the dimension of the inorganic coating along the second direction.

[0012] According to some embodiments of the present invention, the dimension L3 of the coating layer along the second direction ranges from 100mm to 2000mm; and / or, the dimension L4 of the inorganic coating layer along the second direction ranges from 100mm to 2000mm.

[0013] According to some embodiments of the present invention, the inorganic coating has a dimension H3 ranging from 0.2 μm to 8 μm along the first direction.

[0014] According to some embodiments of the present invention, the size H4 of the base film along the first direction ranges from 2μm to 50μm; and / or, the material of the base film is a porous substrate, and the porosity of the porous substrate is 10%-99%.

[0015] According to some embodiments of the present invention, the adhesive layer of the battery cell includes a hot melt adhesive, and the material of the hot melt adhesive includes one of PE, EVA, EEA, EAA, PS, PP, PVA, PAA and PI.

[0016] According to some embodiments of the present invention, the adhesive layer of the battery cell further includes inorganic particles, the material of which includes one of SrTiO3, SnO2, CeO2, MgO, NiO, CaO, ZnO, ZrO2, Y2O3, Al2O3, TiO2, SiC, AlOOH, and SiO2.

[0017] According to some embodiments of the present invention, the inorganic particles in the adhesive layer have a mass ratio ranging from 0 to 0.95.

[0018] This utility model also proposes a battery.

[0019] The battery according to an embodiment of the present invention includes the battery cell described in any of the above embodiments.

[0020] This utility model also proposes an electrical device.

[0021] The electrical equipment according to the embodiments of the present invention includes the battery described in any of the above embodiments.

[0022] The battery, the electrical device, and the battery cell have the same advantages over existing technologies, which will not be repeated here.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is an exploded view of the battery cell according to an embodiment of the present utility model.

[0025] Figure label: Cell 100; First direction F1; Second direction F2; Electrode 1; Current collector 11; Tab 111; Dressing layer 12; Adhesive layer 13; 2. Separator; 21. Base membrane; 211. Blank area; 22. Inorganic coating. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "dimension along the first direction," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Hereinafter, with reference to the accompanying drawings, a battery cell 100 according to an embodiment of the present invention will be described.

[0029] like Figure 1 As shown, the battery cell 100 according to an embodiment of the present invention includes: an electrode 1 and a separator 2. The electrode 1 includes a current collector 11, a dressing layer 12 and an adhesive layer 13. The dressing layer 12 and the adhesive layer 13 are disposed on the same side of the current collector 11 along a first direction F1. The adhesive layer 13 is located on at least one side of the dressing layer 12 along a second direction F2. The first direction F1 and the second direction F2 intersect. The separator 2 includes a base film 21 and an inorganic coating 22. A portion of the base film 21 is provided with the inorganic coating 22 to define a blank portion 211 at the edge of the base film 21. In the first direction F1, the inorganic coating 22 is correspondingly disposed with the dressing layer 12, and the blank portion 211 is correspondingly disposed with the adhesive layer 13. The adhesive layer 13 is adhesively connected to the blank portion 211.

[0030] First, such as Figure 1As shown, the battery cell 100 includes an electrode 1 and a separator 2. The electrode 1 can be a positive electrode or a negative electrode. The electrode 1 includes a current collector 11, a coating layer 12, and an adhesive layer 13. The coating layer 12 and the adhesive layer 13 are disposed on the same side of the current collector 11 along the first direction F1. The current collector 11 is provided with a tab 111 on one side along the second direction F2. The adhesive layer 13 is located on at least one side of the coating layer 12 along the second direction F2, and the adhesive layer 13 and the tab 111 are staggered. The first direction F1 and the second direction F2 intersect.

[0031] Specifically, an adhesive layer 13 may be provided on the side of the dressing layer 12 away from the tab 111 along the second direction F2; or, an adhesive layer 13 may be provided on the side of the dressing layer 12 close to the tab 111 along the second direction F2; or, adhesive layers 13 may be provided on both sides of the dressing layer 12 along the second direction F2. This utility model does not limit this.

[0032] The separator 2 includes a base film 21 and an inorganic coating 22. A portion of the base film 21 is provided with the inorganic coating 22 to define a blank portion 211 at the edge of the base film 21. The blank portion 211 is located on at least one side of the inorganic coating 22 along the second direction F2. In the first direction F1, the inorganic coating 22 is correspondingly disposed with the dressing layer 12, and the blank portion 211 is correspondingly disposed with the adhesive layer 13. The adhesive layer 13 is used to adhesively connect with the blank portion 211 to connect the electrode 1 and the separator 2 together, thereby forming the cell 100 into a whole and solving the defect problem caused by the misalignment of the electrode 1.

[0033] It should be noted that when the diaphragm 2 is provided with electrode plates 1 on both sides along the first direction F1, the inorganic coating 22 can be provided on either side of the base membrane 21 along the first direction F1, or the inorganic coating 22 can be provided on both sides of the base membrane 21 along the first direction F1. This utility model does not limit this.

[0034] With the above configuration, the current collector 11 and the base film 21 can be directly connected through the adhesive layer 13, eliminating the need to arrange an adhesive structure between the dressing layer 12 and the inorganic coating layer 22. This reduces the amount of adhesive used, which helps to reduce costs. It also reduces the size of the cell 100 along the first direction F1, which improves the energy density of the battery. Furthermore, it provides more gap channels for the electrolyte, which is more conducive to electrolyte wetting and improves the wettability of the battery.

[0035] In addition, since the tab 111 and the adhesive layer 13 are located on the same side or opposite side of the dressing layer 12 along the second direction F2, the relative stability between the tab 111 and the diaphragm 2 can be improved.

[0036] According to the embodiment of the present invention, the battery cell 100 has an adhesive layer 13 on the current collector 11 and a corresponding blank portion 211 on the base film 21, so that the adhesive layer 13 can directly connect the current collector 11 and the base film 21 to achieve a stable connection between the electrode 1 and the separator 2. This eliminates the need for the adhesive structure between the dressing layer 12 and the inorganic coating layer 22, which helps to reduce costs, reduce the size of the battery cell 100, increase energy density, and provide more gap channels for the electrolyte, which is more conducive to electrolyte wetting.

[0037] In some embodiments of this invention, the base film 21 is made of an ultra-high molecular weight polymer (UHMWPP), with a viscosity-average molecular weight ranging from 100,000 g / mol to 2,000,000 g / mol. Preferably, the UHMWPP has a viscosity-average molecular weight ranging from 200,000 g / mol to 800,000 g / mol. This allows the adhesive layer 13 to adhere better to the base film 21.

[0038] In some embodiments of this utility model, such as Figure 1 As shown, adhesive layers 13 can be provided on both sides of the dressing layer 12 along the second direction F2, so that the current collector 11 can be adhesively connected to the base film 21 on both sides of the second direction F2 through the adhesive layers 13 respectively. It should be noted that the adhesive layers 13 located on different sides of the dressing layer 12 can have the same size or different sizes, and this utility model does not limit this. As a result, the connection stability between the electrode 1 and the separator 2 can be improved, and the reliability of the cell 100 can be improved.

[0039] In some embodiments of this utility model, such as Figure 1 As shown, the dimension of the adhesive layer 13 along the second direction F2 can be set to L1, and the dimension of the blank portion 211 along the second direction F2 can be set to L2, satisfying: 0.6≤L2 / L1≤2. That is, the ratio of the dimension L2 of the blank portion 211 along the second direction F2 to the dimension L1 of the adhesive layer 13 along the second direction F2 can be greater than or equal to 0.6 and less than or equal to 2, such as 0.6, 0.8, 0.9, 1, 1.2, 1.5, 1.8, 2, etc. Therefore, sufficient adhesive space can be reserved on the base film 21 for the adhesive layer 13, to avoid the adhesive layer 13 adhering to the inorganic coating 22 and affecting the molding quality of the battery cell 100, thus improving the design rationality of the battery cell 100.

[0040] Preferably, the ratio of the dimension L2 of the blank portion 211 along the second direction F2 to the dimension L1 of the adhesive layer 13 along the second direction F2 can be set to a range of 0.8-1.2.

[0041] In some embodiments of this invention, the dimension L1 of the adhesive layer 13 along the second direction F2 can be set to a range of 1mm-20mm, such as 1mm, 2mm, 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, etc. Preferably, the dimension L1 of the adhesive layer 13 along the second direction F2 can be set to a range of 5mm-10mm. This ensures that the adhesive layer 13 has sufficient adhesive properties, improving the structural stability of the battery cell 100.

[0042] In some embodiments of this utility model, the size L2 of the blank portion 211 along the second direction F2 can be set to a range of 1mm-50mm, such as 1mm, 2mm, 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc. Preferably, the size L2 of the blank portion 211 along the second direction F2 can be set to a range of 5mm-20mm. This allows sufficient adhesive space to be reserved on the base film 21 for the adhesive layer 13, and avoids the blank portion 211 being too large and affecting the insulation performance of the separator 2, thus improving the design rationality of the battery cell 100.

[0043] In some embodiments of this utility model, such as Figure 1 As shown, the dimension of the adhesive layer 13 along the first direction F1 can be set to H1, and the dimension of the dressing layer 12 along the first direction F1 can be set to H2, satisfying: 0.3≤H1 / H2≤1.5. That is, the ratio of the dimension H1 of the adhesive layer 13 along the first direction F1 to the dimension H2 of the dressing layer 12 along the first direction F1 can be set to be greater than or equal to 0.3 and less than or equal to 1.5, such as 0.3, 0.5, 0.6, 0.8, 1, 1.2, 1.5, etc.

[0044] It is understandable that the diaphragm 2 is a flexible component. The diaphragm 2 can deform according to the size of the adhesive layer 13 to ensure that the diaphragm 2 can be attached to the adhesive layer 13. By limiting the ratio of the dimension H1 of the adhesive layer 13 along the first direction F1 to the dimension H2 of the dressing layer 12 along the first direction F1 within the above range, the deformation of the diaphragm 2 can be avoided to a large extent, which helps to prevent the diaphragm 2 from interfering with other components (such as the tab 111) and improves the design rationality of the cell 100.

[0045] Preferably, the ratio of the dimension H1 of the adhesive layer 13 along the first direction F1 to the dimension H2 of the dressing layer 12 along the second direction F2 can be set to a range of 0.5-1.2.

[0046] In some embodiments of this utility model, such as Figure 1As shown, the dimension H2 of the dressing layer 12 along the first direction F1 can be set to a range of 30μm-150μm, such as 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, etc. Preferably, the dimension H2 of the dressing layer 12 along the first direction F1 can be set to a range of 60μm-90μm. This improves the overall performance of the battery cell 100.

[0047] In some embodiments of this utility model, such as Figure 1 As shown, the dimension of the dressing layer 12 along the second direction F2 can be set to be less than or equal to the dimension of the inorganic coating 22 along the second direction F2. Preferably, the dimension of the dressing layer 12 along the second direction F2 can be set to be equal to the dimension of the inorganic coating 22 along the second direction F2. This ensures the insulation effect of the inorganic coating 22 and improves the reliability of the battery cell 100.

[0048] In some embodiments of this utility model, such as Figure 1 As shown, the dimension of the dressing layer 12 along the second direction can be set as L3, and the range of the dimension L3 along the second direction F2 is 100mm-2000mm, such as 100mm, 200mm, 500mm, 1000mm, 1200mm, 1500mm, 1800mm, 2000mm, etc. Preferably, the range of the dimension L3 along the second direction F2 is 200mm-1000mm. This avoids the dressing layer 12 being too small, which would affect the performance of the battery cell 100, and also avoids the dressing layer 12 being too large, which would result in poor adhesion of the adhesive layer 13, thus improving the design rationality of the battery cell 100.

[0049] In some embodiments of this utility model, such as Figure 1 As shown, the dimension of the inorganic coating 22 along the second direction F2 can be set to L4, and the range of the dimension L4 along the second direction F2 can be 100mm-2000mm, such as 100mm, 200mm, 500mm, 1000mm, 1200mm, 1500mm, 1800mm, 2000mm, etc. Preferably, the range of the dimension L4 along the second direction F2 can be set to 200mm-1000mm. This ensures the insulation performance of the inorganic coating 22 and improves the design rationality of the battery cell 100.

[0050] In some embodiments of this utility model, such as Figure 1As shown, the dimension of the inorganic coating 22 along the first direction F1 can be set to H3, and the range of the dimension H3 of the inorganic coating 22 along the first direction F1 can be set to 0.2μm-8μm, such as 0.2μm, 0.5μm, 1μm, 2μm, 4μm, 5μm, 6μm, 8μm, etc. Preferably, the range of the dimension H3 of the inorganic coating 22 along the first direction F1 can be set to 0.5μm-4μm. This ensures the insulation performance of the inorganic coating 22 and improves the design rationality of the battery cell 100.

[0051] In some embodiments of this utility model, such as Figure 1 As shown, the dimension of the base membrane 21 along the first direction F1 can be set to H4, and the range of the dimension H4 along the first direction F1 can be set to 2μm-50μm, such as 2μm, 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, etc. This ensures the structural strength of the base membrane 21, improves the overall structural stability of the separator 2, and enhances the design rationality of the cell 100.

[0052] In some embodiments of this invention, the material of the base film 21 can be a porous substrate with a porosity of 10%-99%. For example, the porosity of the porous substrate can be set to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 99%, etc. This allows the adhesive layer 13 to fully penetrate into the pores of the base film 21, which helps improve the connection stability between the adhesive layer 13 and the base film 21, thereby improving the overall stability of the battery cell 100.

[0053] In some embodiments of this invention, the adhesive layer 13 includes a hot melt adhesive. The adhesive layer 13 can be bonded to the blank portion 211 after hot pressing to bond the current collector 11 and the base film 21 together. The hot melt adhesive material can be one of PE, EVA, EEA, EAA, PS, PP, PVA, PAA, and PI. Exemplarily, the hot melt adhesive material can be PE; or, it can be EAA; or, it can include PVA and PAA. This invention does not limit the choice of material. Therefore, the electrode 1 does not adhere at room temperature, facilitating the processing of the cell 100, and the adhesive layer 13 does not adhere to the inorganic coating 22, ensuring the wettability of the battery.

[0054] In some embodiments of the present invention, the adhesive layer 13 further includes inorganic particles. The materials used for these inorganic particles include one of the following: SrTiO3, SnO2, CeO2, MgO, NiO, CaO, ZnO, ZrO2, Y2O3, Al2O3, TiO2, SiC, AlOOH, and SiO2. For example, the inorganic particles may be SrTiO3; or MgO; or Al2O3 and SiC may be used. The present invention does not limit the choice of these materials. Of course, the inorganic particles can also be other inorganic materials with a dielectric constant of 5 or higher. This further improves the insulation performance of the adhesive layer 13 and enhances the reliability of the battery cell 100.

[0055] In some embodiments of this invention, the mass percentage of inorganic particles in the adhesive layer 13 can be set to a range of 0-0.95. It should be noted that the mass percentage of inorganic particles in the adhesive layer 13 is the ratio of the total mass of the inorganic particles to the mass of the adhesive layer 13.

[0056] In other words, the mass percentage of inorganic particles in the adhesive layer 13 can be set to be greater than or equal to 0 and less than or equal to 0.95, such as 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, etc. Preferably, the mass percentage of inorganic particles in the adhesive layer 13 can be set to a range of 0.4-0.8. This avoids excessive inorganic particles affecting the adhesive performance of the adhesive layer 13, thus improving the design rationality of the battery cell 100.

[0057] The specific experimental data are as follows: Example 1: Preparation of diaphragm 2: Prepare slurry by mixing alumina particles with a particle size of 0.5μm, acrylate adhesive and dispersant in a mass ratio of 91:8:1 to form an inorganic particle slurry. Coat the slurry using a gravure roller. The base film 21 has a size of 9μm along the first direction F1, the inorganic coating 22 has a size of 2μm along the first direction F1, and the blank area 211 has a size of 7mm along the second direction F2.

[0058] Battery fabrication: 1) At a suitable temperature (20℃-45℃), graphite, carbon black, CMC, and SBR are mixed in a mass ratio of 100:1:1.6:3.3, along with graphite particles, deionized water, and NMP. The mixture is stirred until homogeneous to prepare a negative electrode slurry. Alumina particles with a particle size of 0.5μm, hot-melt adhesive, and dispersant are mixed in a mass ratio of 6:4:1 to prepare an inorganic particle slurry. This slurry is then coated onto the current collector 11 using a continuous coating device. Adhesive layers 13 are provided on both sides of the coating layer 12 along the second direction F2. The adhesive layer 13 has a dimension of 4mm along the second direction F2, and the coating layer 12 has a dimension of 480mm along the second direction F2. Normal drying is then initiated. The above operation is repeated when brushing the current collector 11 back. The mixture is then rolled until the compaction density reaches 1.6g / cm³. 3 The adhesive layer 13 has a dimension of 175 μm along the first direction F1, and the dressing layer 12 has a dimension of 175 μm along the first direction F1.

[0059] The copper foil and graphite sheet of the above-mentioned negative electrode, cut to the appropriate size, are made into a surface density of 230 g / m³. 2 The negative electrode sheet is prepared by mixing lithium iron phosphate, CNT, carbon black, and PVDF in a mass ratio of 100:0.3:0.5:2.5, adding NMP, and stirring until homogeneous to form a positive electrode slurry with the corresponding dimensions and areal density of 500 g / m³. 2 The positive electrode of lithium iron phosphate is matched with the negative electrode. Alumina particles with a particle size of 0.5 μm, hot-melt adhesive, and dispersant are prepared into an inorganic particle slurry at a mass ratio of 80:15:5. This slurry is simultaneously coated onto the current collector 11 using a continuous coating device. The adhesive layer 13 has a dimension of 4 mm along the second direction F2, and the coating layer 12 has a dimension of 480 mm along the second direction F2. Normal drying is then initiated, and the above operation is repeated when brushing the current collector 11 back. The material is then rolled until the compaction density reaches 2.6 g / cm³. 3 The adhesive layer 13 has a dimension of 175 μm along the first direction F1, and the dressing layer 12 has a dimension of 175 μm along the first direction F1.

[0060] 2) Dissolve 1 mol of lithium salt-LiPF6 in 1 L of organic solvent (the volume ratio of ethylene carbonate to diethyl carbonate is 1:1) to obtain the electrolyte. 3) The prepared positive electrode, separator 2, and negative electrode are stacked alternately. The hot pressing parameters are 80℃, 2MPa, and 120s. After hot pressing, the battery is inverted for 1 minute. The misalignment width between separator 2 and positive electrode and between separator 2 and negative electrode are measured.

[0061] 4) Assembly, baking, electrolyte injection, wetting, formation, capacity testing, battery design capacity 120Ah.

[0062] Example 2 The only difference from Example 1 is that the adhesive layer 13 has a dimension of 5 mm along the second direction F2, and the blank part 211 has a dimension of 8 mm along the second direction F2.

[0063] Example 3 The only difference from Example 1 is that the adhesive layer 13 has a size of 6 mm along the second direction F2, and the blank part 211 has a size of 10 mm along the second direction F2.

[0064] Example 4 The only difference from Example 3 is that the dimension of the adhesive layer 13 along the first direction F1 is 185mm.

[0065] Example 5 The only difference from Example 3 is that the dimension of the adhesive layer 13 along the first direction F1 is 160mm.

[0066] Example 6 The only difference from Example 3 is that the dressing layer 12 does not have an adhesive layer 13 on the side away from the tab 111 along the second direction F2, and the inorganic coating 22 does not have a blank area 211 on the side away from the tab 111 along the second direction F2.

[0067] Example 7 The only difference from Example 3 is that the dressing layer 12 does not have an adhesive layer 13 on the side opposite to the tab 111 along the second direction F2.

[0068] Example 8 The only difference from Example 3 is that the inorganic coating 22 does not have a blank portion 211 on the side away from the tab 111 along the second direction F2.

[0069] Example 9 The only difference from Example 3 is that the inorganic particles are alumina particles with a particle size of 0.5 μm, and the mass ratio of inorganic particles in the adhesive layer 13 is 0.5.

[0070] Example 10 The only difference from Example 3 is that the inorganic particles are alumina particles with a particle size of 0.5 μm, and the mass ratio of inorganic particles in the adhesive layer 13 is 0.3.

[0071] Comparative Example The only difference from Example 3 is that the dressing layer 12 does not have an adhesive layer 13 on either side of the second direction F2, and the inorganic coating 22 does not have a blank area 211 on either side of the second direction F2.

[0072] Test methods Compacted density test: The average dimension of the dressing layer 12 along the first direction F1 is measured and calculated using a micrometer. The compacted density of the dressing layer 12 can be obtained by calculating the ratio of the areal density to the dimension of the dressing layer 12 along the first direction F1, in g / cm³. 3 .

[0073] Misalignment width between diaphragm 2 and electrode 1: Measure the size of diaphragm 2 and electrode 1 along the second direction F2 using an imaging instrument and record the data.

[0074] The experimental results are as follows: In Example 1, the misalignment width between the diaphragm 2 and the electrode 1 is 0.8 mm; in Example 2, the misalignment width between the diaphragm 2 and the electrode 1 is 0.5 mm; in Example 3, the misalignment width between the diaphragm 2 and the electrode 1 is 0 mm; in Example 4, the misalignment width between the diaphragm 2 and the electrode 1 is 0.1 mm; in Example 5, the misalignment width between the diaphragm 2 and the electrode 1 is 0.4 mm; in Example 6, the misalignment width between the diaphragm 2 and the electrode 1 is 1.9 mm; in Example 7, the misalignment width between the diaphragm 2 and the electrode 1 is 1.8 mm; in Example 8, the misalignment width between the diaphragm 2 and the electrode 1 is 1.8 mm; in Example 9, the misalignment width between the diaphragm 2 and the electrode 1 is 0.3 mm; in Example 10, the misalignment width between the diaphragm 2 and the electrode 1 is 0.6 mm; and in the comparative example, the misalignment width between the diaphragm 2 and the electrode 1 is 4.5 mm.

[0075] In general, the larger the size of the adhesive layer 13 along the second direction F2 and the larger the size along the first direction F1, the smaller the misalignment width between the diaphragm 2 and the electrode 1; the lower the mass percentage of inorganic particles in the adhesive layer 13, the smaller the misalignment width between the diaphragm 2 and the electrode 1; the more adhesive layers 13 there are, the smaller the misalignment width between the diaphragm 2 and the electrode 1.

[0076] This utility model also proposes a battery.

[0077] The battery according to an embodiment of the present invention includes a cell 100 according to any of the above embodiments.

[0078] The battery according to the present invention has low cost, high energy density, good wettability, and excellent overall performance.

[0079] This utility model also proposes an electrical device.

[0080] The electrical equipment according to the embodiments of this utility model includes the battery according to any of the above embodiments. It should be noted that the electrical equipment can be a pure electric vehicle, a hybrid vehicle, a drone, etc.

[0081] The electrical equipment according to the embodiments of this utility model has low cost, high energy density, good wettability, and excellent overall performance, thereby enhancing the product competitiveness of the electrical equipment.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0083] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell (100), characterized in that, include: An electrode (1) includes a current collector (11), a dressing layer (12), and an adhesive layer (13). The dressing layer (12) and the adhesive layer (13) are disposed on the same side of the current collector (11) along a first direction (F1), and the adhesive layer (13) is located on at least one side of the dressing layer (12) along a second direction (F2). The first direction (F1) intersects the second direction (F2). The diaphragm (2) includes a base film (21) and an inorganic coating (22). A portion of the base film (21) is provided with the inorganic coating (22) to define a blank portion (211) at the edge of the base film (21). In the first direction (F1), the inorganic coating (22) is disposed corresponding to the dressing layer (12), and the blank portion (211) is disposed corresponding to the adhesive layer (13). The adhesive layer (13) is adhesively connected to the blank portion (211).

2. The battery cell (100) according to claim 1, characterized in that, The dressing layer (12) has the adhesive layer (13) on both sides along the second direction (F2).

3. The battery cell (100) according to claim 1, characterized in that, The adhesive layer (13) has a dimension of L1 along the second direction (F2), and the blank portion (211) has a dimension of L2 along the second direction (F2), satisfying: 0.6≤L2 / L1≤2.

4. The battery cell (100) according to claim 3, characterized in that, The dimension L1 of the adhesive layer (13) along the second direction (F2) ranges from 1mm to 20mm; and / or the dimension L2 of the blank portion (211) along the second direction (F2) ranges from 1mm to 50mm.

5. The battery cell (100) according to claim 1, characterized in that, The adhesive layer (13) has a dimension of H1 along the first direction (F1), and the dressing layer (12) has a dimension of H2 along the first direction (F1), satisfying: 0.3≤H1 / H2≤1.

5.

6. The battery cell (100) according to claim 5, characterized in that, The dimension H1 of the dressing layer (12) along the first direction (F1) ranges from 30μm to 150μm.

7. The battery cell (100) according to claim 1, characterized in that, The dimension of the dressing layer (12) along the second direction (F2) is less than or equal to the dimension of the inorganic coating layer (22) along the second direction (F2).

8. The battery cell (100) according to claim 7, characterized in that, The dimension L3 of the dressing layer (12) along the second direction (F2) ranges from 100mm to 2000mm; and / or, the dimension L4 of the inorganic coating layer (22) along the second direction (F2) ranges from 100mm to 2000mm.

9. The battery cell (100) according to claim 1, characterized in that, The inorganic coating (22) has a dimension H3 ranging from 0.2 μm to 8 μm along the first direction (F1).

10. The battery cell (100) according to claim 1, characterized in that, The size H4 of the base film (21) along the first direction (F1) ranges from 2μm to 50μm; and / or, the material of the base film (21) is a porous substrate with a porosity of 10% to 99%.

11. The battery cell (100) according to any one of claims 1-10, characterized in that, The adhesive layer (13) includes a hot melt adhesive, the material of which includes one of PE, EVA, EEA, EAA, PS, PP, PVA, PAA and PI.

12. The battery cell (100) according to claim 11, characterized in that, The adhesive layer (13) also includes inorganic particles, the materials of which include one of SrTiO3, SnO2, CeO2, MgO, NiO, CaO, ZnO, ZrO2, Y2O3, Al2O3, TiO2, SiC, ALOOH, and SiO2.

13. The battery cell (100) according to claim 12, characterized in that, The inorganic particles account for 0-0.95% of the mass of the adhesive layer (13).

14. A battery, characterized in that, Includes the battery cell (100) according to any one of claims 1-13.

15. An electrical appliance, characterized in that, Includes the battery according to claim 14.

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