Electrode assembly, single battery, battery device, and electric device

Abstract

The utility model discloses a kind of electrode assembly, single battery, battery device and electrical equipment, electrode assembly includes first pole piece and second pole piece, second pole piece and first pole piece are stacked along first direction, the polarity of second pole piece is contrary with the polarity of first pole piece, at least one of first pole piece and second pole piece is multiple, the intensity of at least two of at least one of first pole piece and second pole piece is different.According to the electrode assembly of the utility model, the first pole piece and / or second pole piece of different intensity are supported each other, so as to improve the overall strength of electrode assembly, and further help to improve the safety of electrode assembly, prolong the service life of electrode assembly.

Description

Technical Field

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

[0002] In related technologies, during actual operation, due to the different expansion and contraction properties of the negative electrode current collectors in each negative electrode layer after being compressed, cracks are easily generated in the negative electrode layer and deformation and fracture of the negative electrode current collectors are easily generated, which affects the battery life. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, the first objective of the present invention is to provide an electrode assembly that improves the strength of the electrode assembly, thereby contributing to improved safety and extended service life.

[0004] The second objective of this invention is to propose a single-cell battery.

[0005] The third objective of this invention is to provide a battery device.

[0006] The fourth objective of this utility model is to provide an electrical device.

[0007] An electrode assembly according to a first aspect of the present invention includes: a first electrode; a second electrode, wherein the second electrode and the first electrode are stacked along a first direction, the polarity of the second electrode is opposite to that of the first electrode, and at least one of the first electrode and the second electrode is multiple, and at least two of the at least one of the first electrode and the second electrode have different intensities.

[0008] According to the embodiments of the present invention, the electrode assembly is designed to have at least one or more first electrode plates and second electrode plates, and at least two of the first electrode plates and second electrode plates have different strengths, so as to utilize the first electrode plates and / or second electrode plates of different strengths to support each other, thereby improving the overall strength of the electrode assembly, which in turn helps to improve the safety of the electrode assembly and extend the service life of the electrode assembly.

[0009] According to some embodiments of the present invention, there are multiple second electrode sheets, each including a first sub-electrode sheet and a second sub-electrode sheet, wherein the strength of the second sub-electrode sheet is greater than the strength of the first sub-electrode sheet. According to some embodiments of the present invention, the first sub-electrode includes a first lead-out end, the second sub-electrode includes a second lead-out end, and the first lead-out end and the second lead-out end are not directly electrically connected.

[0010] According to some embodiments of the present invention, there are multiple first sub-electrodes and multiple second sub-electrodes. Multiple first leads are welded to form a first solder mark, and multiple second leads are welded to form a second solder mark. The first solder mark and the second solder mark are spaced apart along the first direction.

[0011] According to some embodiments of the present invention, the length of the first solder mark is less than the length of the first lead-out end, and the width of the first solder mark is less than the width of the first lead-out end; and / or, the length of the second solder mark is less than the length of the second lead-out end, and the width of the second solder mark is less than the width of the second lead-out end.

[0012] According to some embodiments of the present invention, the electrode assembly further includes a conductive connecting piece, a plurality of first leads are welded to the conductive connecting piece to form a third solder mark, a plurality of second leads are welded to the conductive connecting piece to form a fourth solder mark, and the third solder mark and the fourth solder mark are spaced apart.

[0013] According to some embodiments of the present invention, the orthographic projection of the third solder mark in a plane perpendicular to the first direction is located within the first solder mark, and the orthographic projection of the fourth solder mark in a plane perpendicular to the first direction is located within the second solder mark.

[0014] According to some embodiments of this utility model, the distance between the two adjacent sides of the third and fourth solder marks is K, where K ≥ 2 mm.

[0015] According to some embodiments of the present invention, the first lead-out end and the second lead-out end are spaced apart in a direction perpendicular to the first direction.

[0016] According to some embodiments of the present invention, the first lead-out end and the second lead-out end partially overlap in a direction perpendicular to the first direction, and the third solder mark and the fourth solder mark are spaced apart from the overlapping portion.

[0017] According to some embodiments of the present invention, the conductive connecting piece includes: a first conductive connecting portion; a second conductive connecting portion, the second conductive connecting portion being connected to one side of the first conductive connecting portion adjacent to the first electrode piece, and both the first lead-out end and the second lead-out end being electrically connected to the second conductive connecting portion.

[0018] According to some embodiments of the present invention, the width of the first conductive connection portion and the width of the second conductive connection portion are equal; or the width of the first conductive connection portion and the width of the second conductive connection portion are not equal.

[0019] According to some embodiments of the present invention, the electrode assembly further includes multiple electrolyte layers, wherein the first sub-electrode, the electrolyte layer, the first electrode, the electrolyte layer, the second sub-electrode, the electrolyte layer and the first electrode are stacked sequentially along the first direction; or, the first sub-electrode, the electrolyte layer, the first electrode, the electrolyte layer, the first sub-electrode, the electrolyte layer, the first electrode, the electrolyte layer, the second sub-electrode, the electrolyte layer and the first electrode are stacked sequentially along the first direction.

[0020] According to some embodiments of the present invention, the first sub-electrode includes a first current collector and an active material connected to at least one side of the first current collector, and the second sub-electrode includes a second current collector and an active material connected to at least one side of the second current collector, wherein the strength of the second current collector is greater than the strength of the first current collector.

[0021] According to some embodiments of the present invention, the second current collector is a steel foil; and / or, the first current collector is a copper foil.

[0022] According to some embodiments of the present invention, the first electrode is a positive electrode and the second electrode is a negative electrode.

[0023] A single-cell battery according to a second aspect embodiment of the present invention includes an electrode assembly and a housing as described in the first aspect embodiment of the present invention, wherein the electrode assembly is disposed within the housing.

[0024] A battery device according to a third aspect of the present invention includes an electrode assembly of the first aspect of the present invention, or a single cell of the second aspect of the present invention, and a housing, wherein the electrode assembly or the single cell is disposed within the housing.

[0025] The electrical equipment according to the fourth aspect of the present invention includes the battery device of the third aspect of the present invention or the single battery of the second aspect of the present invention.

[0026] 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

[0027] 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 a schematic diagram of an electrode assembly according to an embodiment of the present utility model; Figure 2This is another schematic diagram of the electrode assembly according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the second electrode plate of the electrode assembly according to an embodiment of the present invention; Figure 4 This is a partial schematic diagram of the second electrode plate of the electrode assembly according to an embodiment of the present utility model, wherein the conductive connecting piece is not shown; Figure 5 This is a partial schematic diagram of the second electrode plate of the electrode assembly according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of the first sub-electrode of the electrode assembly according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the second sub-electrode of the electrode assembly according to an embodiment of the present invention.

[0028] Figure label: 100: Electrode assembly; 1: First electrode; 11: Third lead; 2: Second electrode; 21: First sub-electrode; 211: First lead; 212: First current collector; 22: Second sub-electrode; 221: Second lead; 222: Second current collector; 3: Conductive connecting piece; 31: First conductive connecting part; 32: Second conductive connecting part; 33: First adhesive bonding area; 34: Second adhesive bonding area; 4: First solder mark; 5: Third solder mark; 6: Second solder mark; 7: Fourth solder mark; 8: Active material; 9: Electrolyte layer. Detailed Implementation

[0029] The following is for reference. Figures 1-7 The electrode assembly 100 according to a first aspect embodiment of the present invention is described.

[0030] like Figures 1-7 As shown, the electrode assembly 100 according to the first aspect of the present invention includes a first electrode 1 and a second electrode 2.

[0031] Specifically, the second electrode 2 and the first electrode 1 are along a first direction (e.g., Figure 1 The up and down directions in the middle, Figure 3 The first electrode 1 and the second electrode 2 are stacked in the front-to-back direction. The polarity of the second electrode 2 is opposite to that of the first electrode 1. There are multiple first electrode 1 and second electrode 2, and at least two of the first electrode 1 and second electrode 2 have different intensities. In the description of this utility model, "multiple" means two or more.

[0032] For example, in Figure 1 and Figure 2In the example, the electrode assembly 100 can be stacked as follows: first electrode 1, second electrode 2, and first electrode 1; or, second electrode 2, first electrode 1, and second electrode 2; or, second electrode 2, first electrode 1, second electrode 2, first electrode 1, and second electrode 2. No specific limitation is made here. The electrode assembly 100 can be customized according to actual product performance requirements. The number of layers of the first electrode 1 can be 1 to the number of layers in the stack design, the number of layers of the second electrode 2 is the number of layers in the stack design minus the number of layers of the first electrode 1, and the number of layers of the second electrode 2 is also 1 to the number of layers in the stack design.

[0033] The electrode assembly 100 may consist of multiple first electrodes 1, with at least two of the first electrodes 1 having different strengths; alternatively, the electrode assembly 100 may consist of multiple second electrodes 2, with at least two of the second electrodes 2 having different strengths; or, the electrode assembly 100 may consist of multiple first electrodes 1 and multiple second electrodes 2, with at least two of the first electrodes 1 having different strengths and / or at least two of the second electrodes 2 having different strengths. Thus, the first electrodes 1 and / or second electrodes 2 of different strengths support each other, helping to improve the overall strength of the electrode assembly 100 and increase its service life.

[0034] Furthermore, the design of multiple first electrodes 1 and / or multiple second electrodes 2 helps to increase the connection points between the electrode assembly 100 and the external circuit, shorten the electron transport path, reduce the internal resistance of the electrode assembly 100, and reduce heat, thereby improving the safety of the electrode assembly 100 and extending its service life. Simultaneously, it helps the electrode assembly 100 to transfer charge more quickly during charging and discharging, improving the charging and discharging efficiency of the battery using the aforementioned electrode assembly 100, and thus enhancing rate performance. In addition, the design of multiple first electrodes 1 and / or multiple second electrodes 2 allows for a more uniform current distribution on the electrode assembly 100, reducing situations where the local current is too large or too small, thereby improving the consistency of the electrode assembly 100 and enhancing the overall performance and lifespan of the electrode assembly 100.

[0035] According to the embodiment of the present invention, the electrode assembly 100 is designed to have at least one of the first electrode 1 and the second electrode 2 as a plurality of multiples, and at least two of the first electrode 1 and the second electrode 2 have different strengths, so as to utilize the first electrode 1 and / or the second electrode 2 of different strengths to support each other, thereby improving the overall strength of the electrode assembly 100, which in turn helps to improve the safety of the electrode assembly 100 and extend the service life of the electrode assembly 100.

[0036] According to some embodiments of this utility model, refer to Figures 1-5There are multiple second electrode plates 2, each including a first sub-electrode 21 and a second sub-electrode 22. The strength of the second sub-electrode 22 is greater than that of the first sub-electrode 21. The first sub-electrode 21 includes a first lead-out terminal 211, and the second sub-electrode 22 includes a second lead-out terminal 221. The first lead-out terminal 211 and the second lead-out terminal 221 are not directly electrically connected. "Not directly electrically connected" means that they are electrically connected without direct electrical connection methods such as welding. For example, the first lead-out terminal 211 and the second lead-out terminal 221 can be welded to different parts of the same conductive connecting piece 3, and the electrode is led out through the conductive connecting piece 3; or the first lead-out terminal 211 and the second lead-out terminal 221 can be welded to different parts of the terminal post of the battery cell, and the electrode is led out through the terminal post.

[0037] Because the first sub-electrode 21 and the second sub-electrode 22 have different strengths, with the second sub-electrode 22 having greater strength, the strength of the first sub-electrode 21 is enhanced, thereby increasing the strength of the electrode assembly 100 and extending its service life. Simultaneously, the first lead 211 and the second lead 221 are connected in a non-direct electrical connection manner, which helps reduce the difficulty of connecting the first lead 211 and the second lead 221 with different strengths, improving the connection efficiency and reliability of the first lead 211 and the second lead 221.

[0038] Furthermore, there are multiple first sub-electrodes 21 and multiple second sub-electrodes 22. Multiple first leads 211 are welded to form a first solder mark 4, and multiple second leads 221 are welded to form a second solder mark 6. The first solder mark 4 and the second solder mark 6 are spaced apart along a first direction. The multiple first leads 211 of the multiple first sub-electrodes 21 can be connected first to form the first solder mark 4, and the multiple second leads 221 of the multiple second sub-electrodes 22 can be connected first to form the second solder mark 6. Welding them separately simplifies the welding process and improves the connection efficiency of the electrode assembly 100. The spaced arrangement of the first solder mark 4 and the second solder mark 6 along the first direction achieves the spacing between the first leads 211 and the second leads 221 in the first direction, facilitating indirect electrical connection between the first leads 211 and the second leads 221 and also simplifying the processing technology of the electrode assembly 100.

[0039] Furthermore, referring to Figures 3-5 The length of the first solder mark 4 is less than the length of the first lead 211, and the width of the first solder mark 4 is less than the width of the first lead 211. This ensures that the first solder mark 4 is located within the first lead 211, achieving a stable and reliable connection between multiple first leads 211, and preventing at least a portion of the multiple first leads 211 from being unconnected due to the length and / or width of the first solder mark 4 being greater than the corresponding length and / or width of the first lead 211.

[0040] The length of the second solder mark 6 is less than the length of the second lead 221, and the width of the second solder mark 6 is less than the width of the second lead 221. This ensures that the second solder mark 6 is located within the second lead 221, achieving a stable and reliable connection between the multiple second leads 221, and preventing at least a portion of the multiple second leads 221 from being unconnected due to the length and / or width of the second solder mark 6 being greater than the corresponding length and / or width of the second lead 221.

[0041] Furthermore, referring to Figure 4 and Figure 5 The width of the second electrode 2 is W, the length of the first solder mark 4 is Ea, the length of the second solder mark 6 is Eb, and the minimum distance between the first lead 211 and the second lead 221 is N. N, M, Ea, and Eb satisfy: N < W - Ea - Eb. That is, the minimum distance between the first lead 211 and the second lead 221 is less than the width of the first electrode 1 minus the sum of the lengths of the first solder mark 4 and the second solder mark 6. This helps to rationally control the positions of the first lead 211 and the second lead 221 on the second electrode 2, thereby improving the rationality of the structural design of the second electrode 2 and thus enhancing the reliability and stability of the electrical transmission of the electrode assembly 100.

[0042] According to some embodiments of this utility model, refer to Figure 3 and Figure 5 The electrode assembly 100 also includes a conductive connecting piece 3. Multiple first leads 211 are welded to the conductive connecting piece 3 to form a third solder mark 5, and multiple second leads 221 are welded to the conductive connecting piece 3 to form a fourth solder mark 7. The third solder mark 5 and the fourth solder mark 7 are spaced apart. The multiple first leads 211 and multiple second leads 221 are electrically connected through the conductive connecting piece 3, thereby avoiding direct electrical connection between the multiple first leads 211 and multiple second leads 221. The first leads 211 and second leads 221 are electrically connected on the conductive connecting piece 3 as electrodes. The spaced arrangement of the third solder mark 5 and the fourth solder mark 7 helps to avoid direct electrical connection between the first leads 211 and the second leads 221.

[0043] The structure of the conductive connecting piece 3 can be designed with unequal widths according to the actual overcurrent requirements, so as to meet the overcurrent requirements of final welding and series welding at the same time.

[0044] According to some other embodiments of the present invention, refer to Figure 1 The electrode assembly 100 includes a plurality of first electrode plates 1, each first electrode plate 1 including a third lead 11, and the plurality of third leads 11 are welded to a conductive connector to lead out electrodes.

[0045] Furthermore, the orthographic projection of the third solder mark 5 in a plane perpendicular to the first direction lies within the first solder mark 4, and the orthographic projection of the fourth solder mark 7 in a plane perpendicular to the first direction lies within the second solder mark 6. The third solder mark 5 helps improve the connection stability between the first lead-out terminal 211 and the conductive connecting piece 3. Being located within the first solder mark 4, the third solder mark 5 also defines the connection area between the first lead-out terminal 211 and the conductive connecting piece 3, thus helping to improve the connection efficiency between the first lead-out terminal 211 and the conductive connecting piece 3. The fourth solder mark 7 helps improve the connection stability between the second lead-out terminal 221 and the conductive connector. Being located within the second solder mark 6, the fourth solder mark 7 also defines the connection area between the second lead-out terminal 221 and the conductive connecting piece 3, thus helping to improve the connection efficiency between the second lead-out terminal 221 and the conductive connecting piece 3.

[0046] The welding methods used in the following scenarios—multiple first leads 211 welded to form a first weld mark 4, multiple second leads 221 welded to form a second weld mark 6, multiple first leads 211 welded to the conductive connecting piece 3 to form a third weld mark 5, and multiple second leads 221 welded to the conductive connecting piece 3 to form a fourth weld mark 7—can all be resistance spot welding, resistance roll welding, or ultrasonic welding. No specific limitations are specified here.

[0047] In addition, the first weld mark 4, the second weld mark 6, the third weld mark 5, and the fourth weld mark 7 can all be irregular designs.

[0048] According to some other embodiments of the present invention, referring to Figure 4 and Figure 5 The distance between the adjacent sides of the third solder mark 5 and the fourth solder mark 7 is K, where K satisfies: K≥2mm. Therefore, the minimum distance between the third solder mark 5 and the fourth solder mark 7 is reasonable, avoiding mutual interference between them. This helps ensure the reliability and stability of the connection between the first lead 211 and the second lead 221 and the conductive connecting piece 3, thereby improving the strength of the electrode assembly 100, ensuring the structural stability and smooth and reliable electrical transmission of the electrode assembly 100, enhancing the safety of the electrode assembly 100 in use, and extending the service life of the electrode assembly 100.

[0049] According to some embodiments of this utility model, refer to Figures 1-5 The first lead-out terminal 211 and the second lead-out terminal 221 are in a direction perpendicular to the first direction (e.g., Figure 3 The electrodes are spaced apart in the left-right direction. For example, the first lead-out end 211 of the first sub-electrode 21 and the second lead-out end 221 of the second sub-electrode 22 are on the same side of the electrode assembly 100 and are spaced apart along that side (in the direction perpendicular to the first direction). This helps to ensure a non-contact connection between the first lead-out end 211 and the second lead-out end 221, thereby reducing the manufacturing process of the electrode assembly 100.

[0050] According to some specific embodiments of this utility model, refer to Figure 4 and Figure 5 The width of the first solder mark 4 is Da, the width of the third solder mark 5 is Fa, the width of the second solder mark 6 is Db, and the width of the fourth solder mark 7 is Fb. Da, Fa, Db, and Fb satisfy: Da > Fa, Db > Fb. That is, the width of the first solder mark 4 is greater than the width of the third solder mark 5, and the width of the second solder mark 6 is greater than the width of the fourth solder mark 7. This ensures that the third solder mark 5 is located within the first solder mark 4, and the fourth solder mark 7 is located within the second solder mark 6.

[0051] The current-carrying area of ​​the electrode assembly 100 is S, where S satisfies: S = Ga × Fa + Gb × Fb.

[0052] According to some embodiments of the present invention, the first lead-out end 211 and the second lead-out end 221 are in a direction perpendicular to the first direction (e.g., Figure 1 The upper part overlaps in the front-to-back direction. This helps to reduce the extension length of the electrode assembly 100 in the direction perpendicular to the thickness direction of the first electrode 1, thereby facilitating the miniaturization design of the electrode assembly 100 and improving the applicability of the electrode assembly 100.

[0053] For example, refer to Figure 4 and Figure 5 When the projections of the first lead 211 and the second lead 221 onto the plane perpendicular to the thickness direction of the first electrode 1 at least partially overlap, the width of the overlapping portion of the first lead 211 and the second lead 221 is M, the length of the first solder mark 4 is Ea, and the length of the third solder mark 5 is Ga, wherein M, Ea, and Ga satisfy: Ea - M > Ga. The length of the first solder mark 4 between the first lead 211 and the second lead 221, after deducting the width of the overlapping portion of the first lead 211 and the second lead 221, is still greater than the length of the third solder mark 5. This ensures the length of the third solder mark 5, thereby facilitating the reliable connection between the third solder mark 5 and the first lead 211 and the conductive connecting piece 3.

[0054] The width of the overlapping portion of the first lead 211 and the second lead 221 is M, the length of the second solder mark 6 is Eb, and the length of the fourth solder mark 7 is Gb, wherein M, Eb, and Gb satisfy: Eb - M > Gb. The length of the second solder mark 6 between the first lead 211 and the second lead 221, after deducting the width of the overlapping portion of the first lead 211 and the second lead 221, is still greater than the length of the fourth solder mark 7. This ensures the length of the fourth solder mark 7, which is beneficial to ensuring the reliability of the connection between the fourth solder mark 7 and the second lead 221 and the conductive connecting piece 3.

[0055] In some optional embodiments, the width of the overlapping portion of the third solder mark 5 and the fourth solder mark 7 in the plane perpendicular to the thickness direction of the first electrode 1 is M (not shown in the figure), where M satisfies: M < 2 mm. The width of the overlapping portion of the third solder mark 5 and the fourth solder mark 7 is reasonable, thereby facilitating the miniaturization of the electrode assembly 100 while ensuring the reliability and stability of the indirect electrical connection between the first lead 211 and the second lead 221.

[0056] According to some specific embodiments of this utility model, refer to Figure 3 and Figure 5 The conductive connecting piece 3 includes a first conductive connecting portion 31 and a second conductive connecting portion 32. The second conductive connecting portion 32 is connected to the side of the first conductive connecting portion 31 adjacent to the first electrode 1, and both the first lead-out end 211 and the second lead-out end 221 are electrically connected to the second conductive connecting portion 32. The second conductive connecting portion 32 of the conductive connecting piece 3 is designed to be adjacent to the first electrode 1 and the second electrode 2 to improve the connection efficiency between the first lead-out end 211 and the second lead-out end 221 and the second conductive connecting portion 32, which is beneficial for the miniaturization design of the electrode assembly 100. The first conductive connecting portion 31 of the conductive connecting piece 3 is located on the side of the second conductive connecting portion 32 away from the first electrode 1, thereby facilitating the connection of the first conductive connecting portion 31 with other components.

[0057] Furthermore, referring to Figure 3 and Figure 5 The width of the first conductive connection portion 31 and the width of the second conductive connection portion 32 are equal; or the width of the first conductive connection portion 31 and the width of the second conductive connection portion 32 are not equal. That is, the width of the first conductive connection portion 31 and the width of the second conductive connection portion 32 can be equal; the width of the first conductive connection portion 31 can be greater than the width of the second conductive connection portion 32; or the width of the first conductive connection portion 31 can be less than the width of the second conductive connection portion 32. The width relationship between the first conductive connection portion 31 and the second conductive connection portion 32 of the conductive connection piece 3 can be adjusted according to the usage requirements of the electrode assembly 100, thereby helping to improve the applicability of the electrode assembly 100.

[0058] Among them, reference Figure 5 The width of the second conductive connection portion 32 is I, and the width of the first conductive connection portion 31 is H, wherein I and H satisfy: I > H, I = H, or I < H. Therefore, the length of the second conductive connection portion 32, which can be used to connect to the first lead-out terminal 211 and the second lead-out terminal 221, and the width of the first conductive connection portion 31, which is used for series welding with the remaining components, can be equal or unequal. This helps to improve the applicability of the electrode assembly 100.

[0059] According to some embodiments of this utility model, refer to Figure 1 and Figure 2 The electrode assembly 100 further includes multiple electrolyte layers 9. A first sub-electrode 21, electrolyte layer 9, first electrode 1, electrolyte layer 9, second sub-electrode 22, electrolyte layer 9, and first electrode 1 are stacked sequentially along a first direction; or, a first sub-electrode 21, electrolyte layer 9, first electrode 1, electrolyte layer 9, first sub-electrode 21, electrolyte layer 9, first electrode 1, electrolyte layer 9, second sub-electrode 22, electrolyte layer 9, and first electrode 1 are stacked sequentially along the first direction. The first sub-electrodes 21 and second sub-electrodes 22 of the multiple second electrodes 2 are located on both sides of the thickness direction of the first electrode 1, forming a solid-state electrode assembly according to the above-defined arrangement. After the solid-state electrode assembly is fitted into a housing, a solid-state battery (without liquid electrolyte) is formed. Furthermore, the electrolyte layer 9 can be replaced by a separator, i.e., the first sub-electrode 21, separator, first electrode 1, separator, second sub-electrode 22, separator, and first electrode 1 in the electrode assembly 100 are stacked sequentially along a first direction; or, the first sub-electrode 21, separator, first electrode 1, separator, first sub-electrode 21, separator, first electrode 1, separator, second sub-electrode 22, separator, and first electrode 1 are stacked sequentially along a first direction. After the electrode assembly 100 is assembled into the housing according to the above-defined arrangement, a liquid electrolyte is added to form a conventional battery, such as a lithium-ion battery.

[0060] According to some specific embodiments of this utility model, refer to Figure 6 and Figure 7 The first sub-electrode 21 includes a first current collector 212 and an active material 8 connected to at least one side of the first current collector 212. The second sub-electrode 22 includes a second current collector 222 and an active material 8 connected to at least one side of the second current collector 222. The strength of the second current collector 222 is greater than the strength of the first current collector 212.

[0061] The current collector is a component in the electrode assembly 100 used to collect and conduct current, and is typically made of a material with good conductivity. Its main function is to collect the current generated by the active material 8 and transmit it to the external circuit. It also provides mechanical support for the active material 8, ensuring the stability of the electrode assembly 100 structure. The active material 8 is the substance in the electrode assembly 100 that participates in electrochemical reactions. During charging and discharging, it achieves the mutual conversion of chemical energy and electrical energy through the gain and loss of electrons. It is a key factor determining the performance (such as energy density, charge / discharge efficiency, cycle life, etc.) of the electrode assembly 100 and the battery using the electrode assembly 100.

[0062] The difference in strength between the first sub-electrode 21 and the second sub-electrode 22 depends at least on the difference in strength between the first current collector 212 and the second current collector 222. The second current collector 222 has a greater strength, while the first current collector 212 has a smaller strength. The first current collector 212 and the second current collector 222 work together to help improve the strength of the second electrode 2 in the electrode assembly 100. This helps the electrode assembly 100 maintain the integrity of its shape and structure during use, preventing problems such as the active material 8 falling off and internal short circuits, and ensuring the normal operation of the electrode assembly 100 and the battery using the electrode assembly 100.

[0063] Furthermore, the second current collector 222 is steel foil; and / or, the first current collector 212 is copper foil. Copper foil possesses excellent electrical and thermal conductivity, and its chemical stability is relatively good, making it less prone to corrosion in conventional battery environments, thus ensuring its electrical connection performance during long-term use. Steel foil has high strength, capable of withstanding significant tensile and compressive forces, and is less prone to deformation or breakage during battery assembly and use. Therefore, by simultaneously using steel foil and copper foil, the conductivity of the electrode assembly 100 is ensured while simultaneously improving the strength of the second electrode 2, extending the service life of both the second electrode 2 and the electrode assembly 100.

[0064] According to some embodiments of this utility model, the first electrode 1 is a positive electrode and the second electrode 2 is a negative electrode. That is, the strength of the first electrode 1 (i.e., the positive electrode) can be kept unique, while the strength of the multiple second electrodes 2 (i.e., the negative electrodes) can vary. This allows the strength of the second electrodes 2 with greater strength to be increased by the strength of the second electrodes 2 with less strength, thereby meeting the strength requirements of the negative electrode and ensuring the stability of the charge-discharge efficiency and cycle performance of the electrode assembly 100.

[0065] A single-cell battery according to a second aspect embodiment of the present invention includes an electrode assembly 100 and a housing as described in the first aspect embodiment of the present invention, wherein the electrode assembly 100 is disposed within the housing.

[0066] According to the embodiment of the present utility model, the single cell has a relatively complete structure. At the same time, the single cell adopts the electrode assembly 100, which helps to shorten the electron transport path, reduce the internal resistance of the single cell, and enable the single cell to transfer charge more quickly during charging and discharging, thereby improving the charging and discharging efficiency of the single cell and thus helping to improve the rate performance of the single cell.

[0067] The battery device according to a third aspect embodiment of the present invention includes an electrode assembly 100 of the first aspect embodiment of the present invention, or a single cell of the second aspect embodiment of the present invention, and a housing, wherein the electrode assembly 100 or the single cell is disposed in the housing.

[0068] According to the battery device of the present invention, by employing the above-described electrode assembly 100 or a single cell, it is helpful to improve the charging and discharging efficiency of the battery device and improve the rate performance of the battery device.

[0069] The electrical equipment according to the fourth aspect of the present invention includes the battery device of the third aspect of the present invention or the single battery of the second aspect of the present invention.

[0070] According to the embodiments of this utility model, the electrical equipment using the above-mentioned battery device has good power supply stability, which helps to improve the safety and user experience of the electrical equipment, thereby enhancing the market competitiveness of the electrical equipment.

[0071] Other configurations and operations of the single battery, battery device, and electrical equipment according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0072] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0073] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0074] 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., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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.

[0075] 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. An electrode assembly (100), characterized in that, include: First electrode (1); The second electrode (2) and the first electrode (1) are stacked along a first direction. The polarity of the second electrode (2) is opposite to that of the first electrode (1). There are multiple first electrode (1) and second electrode (2). At least two of the first electrode (1) and second electrode (2) have different intensities.

2. The electrode assembly (100) according to claim 1, characterized in that, There are multiple second electrode plates (2), and each of the multiple second electrode plates (2) includes a first sub-electrode plate (21) and a second sub-electrode plate (22). The strength of the second sub-electrode plate (22) is greater than the strength of the first sub-electrode plate (21).

3. The electrode assembly (100) according to claim 2, characterized in that, The first sub-electrode (21) includes a first lead (211), and the second sub-electrode (22) includes a second lead (221). The first lead (211) and the second lead (221) are not directly electrically connected.

4. The electrode assembly (100) according to claim 3, characterized in that, There are multiple first sub-electrodes (21) and multiple second sub-electrodes (22). Multiple first leads (211) are welded to form a first solder mark (4), and multiple second leads (221) are welded to form a second solder mark (6). The first solder mark (4) and the second solder mark (6) are spaced apart along the first direction.

5. The electrode assembly (100) according to claim 4, characterized in that, The length of the first solder mark (4) is less than the length of the first lead (211), and the width of the first solder mark (4) is less than the width of the first lead (211); and / or, The length of the second solder mark (6) is less than the length of the second lead (221), and the width of the second solder mark (6) is less than the width of the second lead (221).

6. The electrode assembly (100) according to claim 4, characterized in that, It also includes a conductive connecting piece (3), a plurality of first leads (211) are welded to the conductive connecting piece (3) to form a third solder mark (5), a plurality of second leads (221) are welded to the conductive connecting piece (3) to form a fourth solder mark (7), and the third solder mark (5) and the fourth solder mark (7) are spaced apart.

7. The electrode assembly (100) according to claim 6, characterized in that, The orthographic projection of the third solder mark (5) in a plane perpendicular to the first direction is located within the first solder mark (4), and the orthographic projection of the fourth solder mark (7) in a plane perpendicular to the first direction is located within the second solder mark (6).

8. The electrode assembly (100) according to claim 6, characterized in that, The distance between the two adjacent sides of the third weld mark (5) and the fourth weld mark (7) is K, where K ≥ 2 mm.

9. The electrode assembly (100) according to any one of claims 3-8, characterized in that, The first lead-out end (211) and the second lead-out end (221) are spaced apart in a direction perpendicular to the first direction.

10. The electrode assembly (100) according to any one of claims 6-8, characterized in that, The first lead-out end (211) and the second lead-out end (221) partially overlap in a direction perpendicular to the first direction, and the third solder mark (5) and the fourth solder mark (7) are spaced apart from the overlapping portion.

11. The electrode assembly (100) according to any one of claims 6-8, characterized in that, The conductive connecting piece (3) includes: First conductive connection part (31); The second conductive connection part (32) is connected to the side of the first conductive connection part (31) adjacent to the first electrode (1), and the first lead-out end (211) and the second lead-out end (221) are both electrically connected to the second conductive connection part (32).

12. The electrode assembly (100) according to claim 11, characterized in that, The width of the first conductive connection portion (31) is equal to the width of the second conductive connection portion (32); or The width of the first conductive connection portion (31) and the width of the second conductive connection portion (32) are not equal.

13. The electrode assembly (100) according to any one of claims 2-8, characterized in that, It also includes multiple electrolyte layers (9), wherein the first sub-electrode (21), the electrolyte layer (9), the first electrode (1), the electrolyte layer (9), the second sub-electrode (22), the electrolyte layer (9), and the first electrode (1) are stacked sequentially along the first direction; or, The first sub-electrode (21), the electrolyte layer (9), the first electrode (1), the electrolyte layer (9), the first sub-electrode (21), the electrolyte layer (9), the first electrode (1), the electrolyte layer (9), the second sub-electrode (22), the electrolyte layer (9) and the first electrode (1) are stacked sequentially along the first direction.

14. The electrode assembly (100) according to any one of claims 2-8, characterized in that, The first sub-electrode (21) includes a first current collector (212) and an active material (8) connected to at least one side of the first current collector (212). The second sub-electrode (22) includes a second current collector (222) and an active material (8) connected to at least one side of the second current collector (222). The strength of the second current collector (222) is greater than the strength of the first current collector (212).

15. The electrode assembly (100) according to claim 14, characterized in that, The second current collector (222) is a steel foil; and / or the first current collector (212) is a copper foil.

16. The electrode assembly (100) according to any one of claims 1-8, characterized in that, The first electrode (1) is the positive electrode and the second electrode (2) is the negative electrode.

17. A single-cell battery, characterized in that, It includes the electrode assembly (100) as described in any one of claims 1-16 and the housing, wherein the electrode assembly (100) is disposed within the housing.

18. A battery device, characterized in that, Includes an electrode assembly (100) according to any one of claims 1-16, or a single cell according to claim 17, and a housing, wherein the electrode assembly (100) or the single cell is disposed within the housing.

19. An electrical appliance, characterized in that, Includes the battery device of claim 18 or the single cell of claim 17.

Images