Tab, tab sheet, tab assembly, battery cell, battery pack and vehicle

Abstract

This application relates to a tab, electrode sheet, electrode assembly, battery cell, battery pack, and vehicle. The tab includes: a substrate layer; and at least one thickening layer connected to the substrate layer along its thickness direction. By connecting at least one thickening layer to the substrate layer along its thickness direction, the thickness of the tab is increased, thereby increasing the current-carrying cross-sectional area of ​​the tab, reducing the local resistance of the tab, reducing heat generation in the tab, and consequently reducing heat generation in the battery cell, thus reducing the likelihood of thermal runaway in the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a tab, electrode, electrode assembly, battery cell, battery pack, and vehicle. Background Technology

[0002] Battery cells generate significant heat during high-rate charging, potentially leading to thermal runaway. Internal heat generation is concentrated at the electrode tabs. Related technologies optimize battery pack heat dissipation strategies to increase heat exchange efficiency and dissipate heat. However, optimizing heat dissipation strategies includes increasing the number of cooling plates, which significantly increases battery pack cost and reduces energy density. Utility Model Content

[0003] This application provides a tab, electrode sheet, electrode sheet assembly, battery cell, battery pack, and vehicle, which reduces heat generation at the tab and at least partially solves the above-mentioned technical problems.

[0004] To achieve the above objectives, according to a first aspect of this application, a tab is provided, comprising:

[0005] Substrate layer;

[0006] At least one thickening layer is attached to the substrate layer along the thickness direction of the substrate layer.

[0007] Optionally, the thickened layer is bonded to the substrate layer by a welding structure or adhesive.

[0008] Optionally, the thickness of the substrate layer is D1, and the thickness of the thickened layer is D2; wherein, 1um≤D1≤12um, and / or, 0.2D1≤D2≤3*D1.

[0009] Optionally, the tab includes at least two thickened layers, which are stacked sequentially along the thickness direction of the substrate layer.

[0010] Optionally, the sum of the thicknesses of the substrate layer and at least two of the thickened layers is D, where D ranges from 1µm to 50µm.

[0011] Optionally, the length of the substrate layer is H1, and the length of the thickened layer is H2, where H2 ≤ H1.

[0012] Optionally, the width of the substrate layer is W1, and the width of the thickened layer is W2, where W2:W1 = (0.01~1):1.

[0013] Optionally, the substrate layer includes at least one composite region, and the thickened layer is connected to the substrate layer within at least one of the composite regions.

[0014] Optionally, the length of the base material layer is H1, the length of the thickened layer is H2, and the length of the composite region is H3, where H3 < H2 ≤ H1.

[0015] Optionally, the width of the composite region is W3, and the width of the thickened layer is W2, where W3:W2 = (0.01 - 1):1.

[0016] Optionally, the base material layer includes two of the composite regions, and the two composite regions include a first composite region and a second composite region that are spaced apart along the length direction of the base material layer. The interval between the first composite region and the second composite region is p, and p is greater than or equal to 0.1 mm.

[0017] According to a second aspect of the present application, there is provided provided provided provided a pole piece, which includes the tab as described above.

[0018] According to a third aspect of the present application, there is provided a pole piece assembly, which includes the tab as described above, or includes the pole piece as described above.

[0019] Optionally, the pole piece assembly includes a plurality of the pole pieces, and the plurality of pole pieces include a plurality of positive pole pieces and a plurality of negative pole pieces. The plurality of positive pole pieces and the plurality of negative pole pieces are stacked in the thickness direction of the pole piece assembly; wherein, the tab of the positive pole piece is located at one end of the pole piece assembly, and the tab of the negative pole piece is located at the other end of the pole piece assembly.

[0020] According to a fourth aspect of the present application, there is provided an electric core, which includes the tab as described above, or includes the pole piece as described above, or includes the pole piece assembly as described above.

[0021] Optionally, the electric core further includes a cover plate. The tab includes at least one composite region, and the thickened layer is connected to the base material layer within each of the composite regions; wherein, a plurality of the tabs are electrically connected to the cover plate in at least one of the composite regions.

[0022] Optionally, the base material layer includes two of the composite regions, and the two composite regions include a first composite region and a second composite region that are spaced apart along the length direction of the base material layer; wherein, a plurality of the tabs are electrically connected to the cover plate in the second composite region.

[0023] According to a fifth aspect of the present application, there is provided a battery pack, which includes a box body and a plurality of electric cores. The electric cores include the electric core as described above, or include the pole piece assembly as described above, or the pole piece as described above, or the tab as described above. [[ID=第28]] [[ID=第29]]

[0024] According to a sixth aspect of the present application, there is provided a vehicle, which includes the battery pack as described above, or includes the electric core as described above, or includes the pole piece assembly as described above, or includes the pole piece as described above, or includes the tab as described above.

[0025] In the tab of this application embodiment, by connecting at least one thickening layer in the thickness direction of the substrate layer of the tab, the thickness of the tab is increased, thereby increasing the cross-sectional area of ​​the tab for overcurrent, thereby reducing the local resistance of the tab, reducing the heat generated by the tab, and further reducing the heat generated by the cell, thereby reducing the occurrence of thermal runaway in the battery pack.

[0026] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0029] Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in an exemplary embodiment of this disclosure;

[0030] Figure 2 This is a schematic diagram of the overall structure of the battery module provided in an exemplary embodiment of this disclosure;

[0031] Figure 3 This is a schematic diagram of the cell structure provided in an exemplary embodiment of this disclosure;

[0032] Figure 4 This is an exploded view of a battery cell provided in an exemplary embodiment of this disclosure;

[0033] Figure 5 This is a schematic diagram of the electrode sheet provided in an exemplary embodiment of this disclosure;

[0034] Figure 6 This is a schematic diagram of the substrate layer connecting the electrode tab of the electrode sheet provided in an exemplary embodiment of this disclosure;

[0035] Figure 7 This is a cross-sectional structural diagram of the substrate layer connecting the thickened layer of the electrode tab of the electrode sheet provided in the exemplary embodiment of this disclosure;

[0036] Figure 8 yes Figure 7 A magnified view of a portion of the image;

[0037] Figure 9This is a schematic diagram of the size parameters of the electrode provided in an exemplary embodiment of this disclosure;

[0038] Figure 10 This is a schematic diagram of the positive electrode sheet provided in an exemplary embodiment of this disclosure;

[0039] Figure 11 This is a schematic diagram of the negative electrode sheet provided in an exemplary embodiment of this disclosure;

[0040] Figure 12 This is a stacked diagram of the electrode assembly provided in an exemplary embodiment of this disclosure;

[0041] Figure 13 This is a schematic diagram of a winding core provided in an exemplary embodiment of this disclosure;

[0042] Figure 14 This is a schematic diagram of the electrode sheet being welded to the cover plate according to an exemplary embodiment of this disclosure;

[0043] Figure 15 This is a schematic diagram of the fabrication process of the electrode assembly provided in an exemplary embodiment of this disclosure.

[0044] Explanation of reference numerals in the attached figures:

[0045] 100. Battery pack; 110. Housing; 120. Battery module;

[0046] 1. Tab; 11. Substrate layer; 12. Thickened layer; 13. Composite region; 131. First composite region; 132. Second composite region;

[0047] 2. Electrode assembly; 21. Electrode; 211. Current collector layer; 212. Active material layer; 22. Positive electrode; 23. Negative electrode;

[0048] 3. Battery cell; 31. Housing; 32. Cover plate; 2. Electrode assembly; Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0050] Embodiments of this application provide a battery pack 100, such as Figure 1 and Figure 2As shown, the battery pack 100 includes a housing 110 and at least one battery module 120 disposed inside the housing 110. Each battery module 120 includes a plurality of battery cells 3 arranged in a matrix. The battery pack 100 can be an energy storage battery pack or a power battery pack.

[0051] Embodiments of this application provide a battery cell 3, such as Figure 3 and Figure 4 As shown, the battery cell 3 includes a housing 31, a cover plate 32, and an electrode assembly 2. The battery cell 3 can be a square battery cell or a cylindrical battery cell.

[0052] The housing 31 has a hollow inner cavity, and the electrode assembly 2 is disposed in the inner cavity of the housing 31. A cover plate 32 is provided at one or both ends of the housing 31, and the cover plate 32 is used to close the end opening of the housing 31.

[0053] Embodiments of this application also provide an electrode assembly 2, such as Figures 4 to 7 As shown, the electrode assembly 2 includes multiple electrodes 21, each including a positive electrode 22 and a negative electrode 23. The positive and negative electrodes 22 and 23 are stacked in the thickness direction of the electrode assembly 2. The stacked positive and negative electrodes 22 and 23 are wound together to form a core. The electrode assembly 2 also includes multiple separators, with a separator between each positive electrode 22 and each negative electrode 23 to separate them. The tabs 1 of the positive electrode 22 are bent and located at one end of the electrode assembly 2, and the tabs 1 of the negative electrode 23 are bent and located at the other end of the electrode assembly 2, so that the tabs 1 of the positive electrode 22 are electrically connected to the cover plate 32 at one end of the housing 31, and the tabs 1 of the negative electrode 23 are electrically connected to the housing 31 or the cover plate 32 at the other end of the housing 31.

[0054] In this embodiment, a positive electrode tab is connected to one end of each positive electrode plate 22, and a negative electrode tab is connected to one end of each negative electrode plate 23. In the embodiments of this application, the positive electrode tabs and the negative electrode tabs have the same structure, and are collectively referred to as tabs in the following embodiments.

[0055] In some embodiments, such as Figures 7 to 11 As shown, both the positive electrode 22 and the negative electrode 23 include a current collector layer 211 and an active material layer 212. The active material layer 212 is connected to the side of the current collector layer 211, and the tab 1 is connected to the end of the current collector layer 211. The active material layer 212 is connected to the side of the current collector layer 211 by coating.

[0056] In some embodiments, continue to refer to Figures 10 to 12As shown, the tab 1 includes a substrate layer 11 and a thickening layer 12, with the thickening layer 12 connected to the substrate layer 11 along the thickness direction of the substrate layer 11. The number of thickening layers 12 can be one, two, or more. In the embodiments of this application, the specific number of thickening layers 12 is not limited.

[0057] By connecting at least one thickening layer 12 in the thickness direction of the substrate layer 11 of the tab 1, the thickness of the tab 1 is increased, thereby increasing the cross-sectional area of ​​the tab 1 for overcurrent, thereby reducing the local resistance of the tab 1, reducing the heat generation of the tab 1, and further reducing the heat generation of the cell 3, thereby reducing the occurrence of thermal runaway in the battery pack.

[0058] In some embodiments, both the substrate layer 11 and the thickened layer 12 are made of conductive materials, which can be metals or other materials. The substrate layer 11 and the thickened layer 12 can be made of the same metal material or different metal materials. When the tab 1 is a positive tab, the substrate layer 11 can be aluminum foil. When the tab 1 is a negative tab, the substrate layer 11 can be copper foil.

[0059] In some embodiments, the thickening layer 12 is connected to the substrate layer 11 by welding or adhesive to form a stable connection structure between the thickening layer 12 and the substrate layer 11. Besides welding or bonding, the connection between the thickening layer 12 and the substrate layer 11 can also be a press-fit connection. Suitable welding methods include ultrasonic welding and laser welding. In a specific embodiment, the thickening layer 12 and the substrate layer 11 are connected to form the tab 1 by ultrasonic welding, wherein the ultrasonic welding amplitude is 10kHz to 35kHz and the welding pressure is 0.05MPa to 0.8MPa.

[0060] Taking copper foil as an example where both the substrate layer 11 and the thickened layer 12 are made of copper foil, the applicant verified that after connecting substrate layers 11 and thickened layers 12 of different thicknesses, the maximum resistance, welding pressure, welding amplitude, and solder residue of the tab 1 were tested. Specifically, when the tab formed by welding the substrate layer 11 and the thickened layer 12 is subjected to a tensile test, the maximum welding tensile force F that it can withstand must meet the following requirements: 3N ≤ F ≤ 60N, and the solder residue rate after the thickened layer 12 separates from the substrate layer 11 must be ≥ 20%.

[0061] Table 1. Composite parameters of substrate and thickened layers of different thicknesses

[0062]

[0063] As shown by the experimental data comparison in Table 1, adding a thicker layer 12 to the base material layer 11 can reduce the maximum resistance of the tab, thereby reducing the heat generated by the tab. Furthermore, as the thickness of the thicker layer 12 or the base material layer 11 increases, the maximum resistance of the tab 1 can further increase, further reducing the heat generated by the tab. At the same time, increasing the thickness of the thicker layer 12 or the base material layer 11 will increase the welding amplitude and reduce the solder residue, thus affecting the welding quality.

[0064] In some embodiments, such as Figure 11 and Figure 12 As shown, the thickness of the substrate layer 11 is D1, and the thickness of the thickened layer 12 is D2, wherein 1µm ≤ D1 ≤ 13µm, and / or 0.2D1 ≤ D2 ≤ 3*D1. The applicant has found through research that when D1 satisfies 1µm ≤ D1 ≤ 12µm, it is beneficial to maintain the structural strength of the substrate layer 11 without causing excessive weight of the tab 1. When D1 and D2 satisfy 0.2D1 ≤ D2 ≤ 3*D1, it is beneficial to maintain the structural strength of the thickened layer 12 and reduces heat generation of the tab 1. In specific embodiments, the thickness D1 of the substrate layer 11 can be 1µm, 2µm, 3µm, 4µm, 5µm, 6µm, 7µm, 8µm, 9µm, 10µm, 11µm, 12µm, 13µm, or any value between any two of the above values, or a range between any two of the above values. The ratio between D2 and D1 can be 0.2, 0.5, 0.8, 1.0, 1.3, 1.6, 1.8, 2.0, 2.3, 2.5, 2.8, 3.0, or any value between any two of the above, or a range between any two of the above values.

[0065] In some embodiments, the electrode 1 includes at least two thickened layers 12, which are stacked sequentially along the thickness direction of the substrate layer 11. The inventors verified through the embodiments shown in Table 2 below that by providing a double-layer thickened layer 12 compared to a single-layer thickened layer 12, the internal resistance of the electrode 21 can be further reduced.

[0066] Table 2. Composite parameters of thickened layers with different numbers of layers when the substrate layer and the thickened layer have the same thickness.

[0067]

[0068] In Table 2 above, aluminum foil is used as the material for the positive electrode tab, and copper foil is used as the material for the negative electrode tab. The experimental data in Table 2 shows that when the positive electrode substrate layer and a single-layer thickened layer are combined, the maximum resistance of the tab decreases by 43.1%; when the positive electrode substrate layer and a double-layer thickened layer are combined, the maximum resistance of the tab decreases by 51.8%. When the negative electrode substrate layer and a single-layer thickened layer are combined, the maximum resistance of the tab decreases by 32.5%; when the negative electrode substrate layer and a double-layer thickened layer are combined, the maximum resistance of the tab decreases by 46.5%.

[0069] In some embodiments, the sum of the thicknesses of the base material layer 11 and at least two thickening layers 12 is D, and the range of D is: 1 um ≤ D ≤ 50 um. It can be understood that when the thickness D of the base material layer 11 and at least two thickening layers 12 is set to 1 um ≤ D ≤ 50 um, it is beneficial to reduce the resistance of the tab 1 after the at least two thickening layers 12 are compounded with the base material layer 11, reduce the heat generation of the tab, and at the same time will not cause the tab to be too thick, thereby affecting the welding of the tab. In some embodiments, the sum of the thicknesses D of the at least two thickening layers 12 can be 1 um, 5 um, 10 um, 15 um, 20 um, 25 um, 30 um, 35 um, 40 um, 45 um, 50 um, and values between any two of the above or ranges between any two of the above values.

[0070] In some embodiments, as Figure 13 shown, the length of the base material layer 11 is H1, the length of the thickening layer 12 is H2, and H2 ≤ H1. By making the length H2 of the thickening layer 12 and the length H1 of the base material layer 11 satisfy: H2 ≤ H1, it is convenient that after the thickening layer 12 is compounded with the base material layer 11, the local thickness in the length direction of the base material layer 11 of the tab can increase, thereby reducing the resistance of the tab 1 and reducing the heat generation of the tab 1, and it is convenient to connect the thickening layer 12 to the tab 1.

[0071] In some embodiments, continue to refer to Figure 13 , the width of the base material layer 11 is W1, the width of the thickening layer 12 is W2, and W2:W1 = (0.01 - 1):1. By making the width W2 of the thickening layer 12 and the width W1 of the base material layer 11 satisfy: W2:W1 = (0.01 - 1):1, the local thickness in the width direction of the base material layer 11 of the tab 1 can increase, and it is convenient to connect the thickening layer 12 to the tab 1.

[0072] In some embodiments, the base material layer 11 includes at least one composite area 13, and the thickening layer 12 is connected to the base material layer 11 within at least one composite area 13. In a specific embodiment, when the thickening layer 12 is connected to the base material layer 11 by welding, the composite area 13 is a welding mark area. By connecting the thickening layer 12 to the base material layer 11 within at least one composite area 13, the thickening layer 12 and the base material layer 11 can form a stable connection, preventing the thickening layer 12 and the base material layer 11 from separating due to unstable bonding.

[0073] In some embodiments, the length of the base material layer 11 is H1, the length of the thickening layer 12 is H2, and the length of the composite area 13 is H3, and H3 < H2 ≤ H1. When the lengths H1 of the base material layer 11, H2 of the thickening layer 12, and H3 of the composite area 13 satisfy: H3 < H2 ≤ H1, the welding effect between the thickening layer 12 and the base material layer 11 is the best.

[0074] In some embodiments, the length H3 of the composite region 13 satisfies: 1mm ≤ H3 ≤ 4.5mm. In a specific embodiment, when the thickened layer 12 is connected to the substrate layer 11 by welding, the composite region 13 is a solder area. When the length H3 of the composite region 13 satisfies: 1mm ≤ H3 ≤ 4.5mm, the welding strength between the thickened layer 12 and the substrate layer 11 is suitable, and it will not result in a large tab size. In a specific embodiment, the length H3 of the composite region 13 can be 1mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, or any value between any two of the above values, or a range between any two of the above values.

[0075] In some embodiments, the width of the composite region 13 is W3, and the width of the thickened layer 12 is W2, with W3:W2 = (0.01~1):1. In a specific embodiment, the thickened layer 12 is connected to the substrate layer 11 by welding. When the width W3 of the composite region 13 and the width W2 of the thickened layer 12 satisfy W3:W2 = (0.01~1):1, the welding effect between the thickened layer 12 and the substrate layer 11 is optimal. In specific implementations, the ratio between W3 and W2 can be 0.01, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, or any value between any two of the above values, or a range between any two of the above values.

[0076] In some embodiments, such as Figure 14 As shown, the substrate layer 11 includes two composite regions 13. Each composite region 13 includes a first composite region 131 and a second composite region 132 spaced apart along the length of the substrate layer 11. The interval between the first composite region 131 and the second composite region 132 is p, which is greater than or equal to 0.1 mm. The main function of the first composite region 131 is to composite the substrate layer 11 and the thickened layer 12. The main function of the second composite region 132 is to weld the composite substrate layer 11 and the thickened layer 12 to the cover plate. By setting the interval p between the first composite region 131 and the second composite region 132 to be greater than or equal to 0.1 mm, the first composite region 131 and the second composite region 132 are separated to achieve their respective functions, avoiding overlapping of solder marks due to excessively close spacing, which could lead to poor welding such as porosity in the solder marks. In specific implementations, p can be 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.

[0077] In some embodiments, the substrate layer 11 of the tab 1 and the current collector layer 211 of the electrode 21 are integrally formed, and the substrate layer 11 of the tab 1 and the current collector layer 211 of the electrode 21 have the same thickness, so that the thickness is only increased at the substrate layer 11 of the tab 1, thereby reducing the heat generation at the tab 1.

[0078] In some embodiments, such as Figure 15 As shown, embodiments of this application also provide a method for manufacturing an electrode assembly, and taking the assembly as a winding core as an example, the manufacturing method includes the following steps:

[0079] Step 1: After unwinding the electrode core coated with the active material layer, lay it out. At the same time, unwind and lay the thickened layer roll flat. Then, bond the substrate layer and the thickened layer of the electrode tab together and form the first composite area by ultrasonic roll welding. This allows the substrate layer and the thickened layer to have electrical conductivity and certain mechanical properties in the first composite area.

[0080] Step 2: The single-layer electrode sheet, after being combined with the thickened layer, is cut according to the product design requirements to form multiple individual electrode sheets.

[0081] The third step involves stacking the individually processed positive and negative electrode sheets to form a core. Simultaneously, the tabs of the core are ultrasonically pre-welded at the second composite zone, ensuring that each layer of electrode sheets forms a single unit within the second composite zone.

[0082] Step 4: Weld the core and cover plate together in the second composite area to form a whole and make the circuits of the core and cover plate connected.

[0083] Step 5: After the core is placed into the casing, it forms a battery cell, and multiple battery cells are assembled to form a battery pack.

[0084] The electrode manufacturing process provided in this application is compatible with existing production lines and has a low cost. At the same time, the cells manufactured by the above method have low internal resistance and stable electrochemical performance, which can extend the battery's service life.

[0085] According to a first aspect of this application, a tab is provided, comprising: a substrate layer; and at least one thickening layer connected to the substrate layer along the thickness direction of the substrate layer.

[0086] By connecting at least one thickening layer 12 in the thickness direction of the substrate layer 11 of the tab 1, the thickness of the tab 1 is increased, thereby increasing the cross-sectional area of ​​the tab 1 for overcurrent, thereby reducing the local resistance of the tab 1, reducing the heat generation of the tab 1, and further reducing the heat generation of the cell 3, thereby reducing the occurrence of thermal runaway in the battery pack.

[0087] According to a second aspect of this application, an electrode is provided, the electrode comprising the tabs as described above. The electrode comprising the tabs described above possesses all the beneficial effects of the tabs described above, which will not be repeated here.

[0088] According to a third aspect of this application, an electrode assembly is provided, the electrode assembly comprising, or comprising, the electrode as described above. The electrode assembly comprising the electrode as described above or comprising the electrode as described above has all the beneficial effects of the electrode as described above, which will not be elaborated further in this disclosure.

[0089] According to a fourth aspect of this application, a battery cell is provided, the battery cell comprising the tabs as described above, or the electrode sheets as described above, or the electrode sheet assembly as described above. The battery cell comprising the electrode sheet assembly as described above, or the electrode sheets as described above, or the tabs as described above, has all the beneficial effects of the tabs described above, which will not be elaborated further in this disclosure.

[0090] In some embodiments, the battery cell 3 further includes a cover plate 32, which can be welded to the tab 1 in at least one composite region (13). Specifically, a plurality of tabs 1 are electrically connected to the cover plate 32 in the second composite region 132, so that the tabs 1 are stably electrically connected between the cover plates 32, wherein the electrical connection method may be welding.

[0091] According to a fifth aspect of this application, a battery pack is provided, the battery pack including a housing and a plurality of battery cells, the battery cells including the battery cells as described above, or including the electrode assembly as described above, or the electrode sheet as described above, or the tab as described above. The battery pack including the battery cells as described above, or including the electrode assembly as described above, or including the electrode sheet as described above, or including the tab as described above, has all the beneficial effects of the tab as described above, which will not be repeated here.

[0092] According to a sixth aspect of this application, a vehicle is provided that includes a battery pack as described above, or includes battery cells as described above, or includes an electrode assembly as described above, or includes the electrodes as described above, or includes tabs as described above. The vehicle, including the battery pack as described above, or including the electrode assembly as described above, or including the electrodes as described above, or including the tabs as described above, has all the beneficial effects of the aforementioned tabs, which will not be elaborated further in this disclosure.

[0093] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0094] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0095] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0096] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A type of electrode (1), characterized in that, Comprising: A base material layer (11); At least one thickened layer (12), which is connected to the base material layer (11) along the thickness direction of the base material layer (11).

2. The electrode tab (1) according to claim 1, characterized in that, The thickened layer (12) is connected to the base material layer (11) through a welding structure or glue.

3. The electrode tab (1) according to claim 1, characterized in that, The thickness of the base material layer (11) is D1, and the thickness of the thickened layer (12) is D2; wherein, 1um ≤ D1 ≤ 12um, and / or, 0.2D1 ≤ D2 ≤ 3*D1.

4. The electrode tab (1) according to claim 1, characterized in that, The tab (1) includes at least two layers of the thickened layer (12), and at least two layers of the thickened layer (12) are stacked in sequence along the thickness direction of the base material layer (11).

5. The electrode tab (1) according to claim 4, characterized in that, The sum of the thicknesses of the base material layer (11) and at least two layers of the thickened layer (12) is D, and the range of D is: 1um ≤ D ≤ 50um.

6. The electrode tab (1) according to claim 1, characterized in that, The length of the base material layer (11) is H1, and the length of the thickened layer (12) is H2, H2 ≤ H1.

7. The electrode tab (1) according to claim 1, characterized in that, The width of the base material layer (11) is W1, and the width of the thickened layer (12) is W2, W2:W1 = (0.01~1):

1.

8. The electrode tab (1) according to claim 1, characterized in that, The base material layer (11) includes at least one composite area (13), and the thickened layer (12) is connected to the base material layer (11) within at least one of the composite areas (13).

9. The electrode tab (1) according to claim 8, characterized in that, The length of the base material layer (11) is H1, the length of the thickened layer (12) is H2, and the length of the composite area (13) is H3, H3 < H2 ≤ H1, and / or, 1mm ≤ H3 ≤ 4.5mm.

10. The electrode tab (1) according to claim 8, characterized in that, The width of the composite area (13) is W3, and the width of the thickened layer (12) is W2, W3:W2 = (0.01~1):

1.

11. The electrode tab (1) according to claim 8, characterized in that, The base material layer (11) includes two of the composite areas (13), and the two composite areas (13) include a first composite area (131) and a second composite area (132) that are spaced apart along the length direction of the base material layer (11), and the spacing between the first composite area (131) and the second composite area (132) is p, and p is greater than or equal to 0.1mm.

12. An electrode sheet, characterized in that, The electrode tab includes the tab according to any one of claims 1~11.

13. An electrode tab assembly, including the tab according to any one of claims 1~11, or the electrode tab according to claim 12.

14. The electrode assembly according to claim 13, characterized in that, The electrode tab assembly includes a plurality of the electrode tabs, and the plurality of electrode tabs include a plurality of positive electrode tabs (22) and a plurality of negative electrode tabs (23), and the plurality of positive electrode tabs (22) and the plurality of negative electrode tabs (23) are stacked in the thickness direction of the electrode tab assembly; wherein, the tab of the positive electrode tab (22) is located at one end of the electrode tab assembly, and the tab of the negative electrode tab (23) is located at the other end of the electrode tab assembly.

15. A battery cell, characterized in that, The battery cell includes the tab according to any one of claims 1~11, or includes the electrode tab according to claim 12, or includes the electrode tab assembly according to claim 13 or 14.

16. The battery cell according to claim 15, characterized in that, The battery cell also includes a cover plate (32), the tab includes at least one composite region (13), the thickened layer (12) is connected to the substrate layer (11) in each composite region (13); wherein, a plurality of the tabs (1) are electrically connected to the cover plate (32) in at least one composite region (13).

17. The battery cell according to claim 16, characterized in that, The substrate layer (11) includes two composite regions (13), and the two composite regions (13) include a first composite region (131) and a second composite region (132) spaced apart along the length direction of the substrate layer (11); wherein, a plurality of tabs (1) are electrically connected to the cover plate (32) in the second composite region (132).

18. A battery pack, characterized in that, The battery pack includes a housing and a plurality of battery cells, the battery cells including the battery cells as described in any one of claims 15-17, or the electrode assembly as described in claim 13 or 14, or the electrode as described in claim 12, or the tab as described in any one of claims 1-11.

19. A vehicle, characterized in that, The vehicle includes a battery pack as claimed in claim 18, or a cell as claimed in any one of claims 15-17, or an electrode assembly as claimed in claim 13 or 14, or an electrode as claimed in claim 12, or a tab as claimed in any one of claims 1-11.

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