Current collecting component, electrochemical device and electrical device

Abstract

The present application provides a current collecting component, an electrochemical device and an electrical device. The current collecting component includes a substrate and a convex portion. The substrate has a first surface and a second surface arranged opposite to each other along its thickness direction. The convex portion protrudes from the first surface, and the convex portion includes a bottom wall and a side wall. The side wall connects the substrate and the bottom wall, and the side wall and the bottom wall enclose a cavity. The side wall includes a first wall portion and a second wall portion arranged in sequence along the thickness direction of the substrate, and the first wall portion and the second wall portion are connected and form a fold at the connection position. With this current collecting component, when the current collecting component is subjected to pressure during the connection process with the housing assembly, the bending moment of the substrate acting on the bottom wall can be transferred to the fold at the connection between the first wall portion and the second wall portion, thereby effectively reducing the degree of convex deformation of the bottom wall and reducing the risk of an unreliable connection between the bottom wall of the current collecting component and the housing assembly.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a current collecting component, an electrochemical device, and an electrical device. Background Art

[0002] Cylindrical batteries are widely used in electric vehicles, electric two-wheeled vehicles, electric tools and other fields due to their advantages such as easy manufacturing and good safety. Usually, a current collecting component is welded between the shell assembly and the electrode assembly of the cylindrical battery, and the electrical connection between the electrode assembly and the shell assembly is achieved through the current collecting component. Summary of the invention

[0003] The inventors of the present application have discovered that in the prior art, during the production and assembly process of cylindrical batteries, cold welding or loose welding is prone to occur between the current collecting component and the shell assembly, resulting in insufficient connection reliability between the current collecting component and the shell assembly, thereby affecting the reliability and service life of the electrochemical device.

[0004] In view of the above problems, the present application provides a current collecting component, an electrochemical device and an electrical device, which can effectively improve the reliability and service life of the electrochemical device.

[0005] In a first aspect, the present application provides a current collecting component, comprising a substrate and a protrusion; the substrate has a first surface and a second surface arranged opposite to each other along its thickness direction; the protrusion protrudes from the first surface, the protrusion comprises a bottom wall and a side wall, the side wall connects the substrate and the bottom wall, and the side wall and the bottom wall form a cavity; wherein the side wall comprises a first wall portion and a second wall portion arranged in sequence along the thickness direction of the substrate, the first wall portion and the second wall portion are connected and form a fold at the connection position.

[0006] In the above technical solution, by setting the side wall of the protrusion as the first wall portion and the second wall portion arranged along the thickness direction of the substrate, and setting the connection position of the first wall portion and the second wall portion to an angle structure, that is, a bending structure is formed on the side wall. When the current collecting component with such a structure is subjected to pressure during the connection process between the current collecting component and the outer shell assembly, the bending moment of the substrate acting on the bottom wall can be transferred to the angle connected between the first wall portion and the second wall portion, thereby reducing the bending moment exerted on the bottom wall, thereby effectively reducing the degree of convex deformation of the bottom wall, reducing the risk of unreliable connection between the bottom wall of the current collecting component and the outer shell assembly, improving the connection reliability between the bottom wall and the outer shell assembly, and thereby improving the reliability and service life of the electrochemical device with such a current collecting component.

[0007] In some embodiments, the corner points toward the cavity.

[0008] In the above technical solution, the angle formed by the connection position between the first wall portion and the second wall portion is set to point to the cavity, that is, the angle formed by the connection position between the first wall portion and the second wall portion is bent into the cavity. The current collecting component adopting this structure can further reduce the bending moment of the bottom wall, thereby helping to further reduce the degree of convex deformation of the bottom wall during the connection process with the outer shell assembly.

[0009] In some embodiments, the base plate and the bottom wall are parallel to each other.

[0010] In the above technical solution, by arranging the substrate and the bottom wall of the current collecting component to be parallel to each other, on the one hand, it is easy to process and manufacture, and on the other hand, it is easy to connect the substrate to the electrode tab of the electrode assembly and the bottom wall to the housing assembly.

[0011] In some embodiments, one end of the first wall portion away from the second wall portion is connected to the bottom wall, and one end of the second wall portion away from the first wall portion is connected to the substrate; the angle between the first wall portion and the bottom wall is a, and the angle of the corner facing the side of the cavity is γ, b = γ-(180°-a), satisfying that a<b.

[0012] In the above technical solution, b is the angle between the plane passing through the vertex of the angle and located in the cavity and parallel to the bottom wall and the second wall portion. By setting b to be greater than a, b=γ-(180°-a), that is, the angle formed at the connection position between the first wall portion and the second wall portion is a structure bent into the cavity. This structure can better transfer the force of the substrate to the angle and reduce the bending moment on the bottom wall, thereby reducing the degree of convex deformation of the bottom wall during the connection process with the shell assembly.

[0013] In some embodiments, 10°≤ba≤80°. In some embodiments, 20°≤ba≤70°.

[0014] In the above technical solution, by setting the value of ba to 20° to 70°, the angle formed between the first wall portion and the second wall portion can better share the bending moment transmitted from the substrate to the bottom wall, thereby further reducing the degree of convex deformation of the bottom wall during the connection process with the outer shell assembly, thereby improving the connection reliability between the bottom wall and the outer shell assembly.

[0015] In some embodiments, 90°≤a≤135°. In some embodiments, 100°≤b≤170°. In some embodiments, 110°≤b≤160°.

[0016] In the above technical solution, by setting the angle between the first wall portion and the bottom wall to 90° to 135°, on the one hand, the phenomenon that the first wall portion is not easy to process due to the angle between the first wall portion and the bottom wall being less than 90° can be alleviated, thereby facilitating the processing difficulty of the first wall portion. That is to say, when the angle between the first wall portion and the bottom wall is less than 90°, the first wall portion presents a structure inclined toward the cavity, thereby causing the processing difficulty of the first wall portion to be greater, and on the other hand, the phenomenon that the force condition of the bottom wall is not improved well due to the excessive angle between the first wall portion and the bottom wall can be reduced. In addition, by setting the angle between the second wall portion and the bottom wall to 110° to 160°, on the one hand, the phenomenon that the bending degree between the second wall portion and the substrate is too large due to the small angle between the second wall portion and the bottom wall, which makes the processing difficulty greater, can be alleviated, and on the other hand, the phenomenon that the second wall portion and the substrate tend to be parallel due to the excessive angle between the second wall portion and the bottom wall can be reduced, thereby causing the angle between the first wall portion and the second wall portion to share the bending moment transmitted from the substrate to the bottom wall to be poor.

[0017] In some embodiments, along the thickness direction of the substrate, the distance between the substrate and the bottom wall is L 1 , the distance between the connection position of the first wall portion and the second wall portion and the bottom wall is L 2 , satisfying: 0.1≤L 2 / L 1 ≤0.9. In some embodiments, 0.2≤L 2 / L 1 ≤0.8.

[0018] In the above technical solution, by setting the distance between the connection position of the first wall portion and the second wall portion and the bottom wall to 20% to 80% of the distance between the substrate and the bottom wall, so that the angle formed between the first wall portion and the second wall portion is located near the middle of the side wall in the thickness direction of the substrate, on the one hand, the processing difficulty of the current collecting component can be reduced, and on the other hand, the angle formed between the first wall portion and the second wall portion can better share the bending moment transmitted from the substrate to the bottom wall, thereby better reducing the degree of convex deformation of the bottom wall during the connection process with the outer shell component.

[0019] In some embodiments, 0.2 mm ≤ L 1 ≤5mm. In some embodiments, 0.04mm≤L 2 ≤2mm.

[0020] In the above technical solution, by 1The distance L between the connection position of the first wall portion and the second wall portion and the bottom wall is set to 0.2 mm to 5 mm, which can improve the problem of processing difficulty caused by too small a distance, and can also alleviate the phenomenon that the current collecting component occupies too much space due to too large a distance, so as to improve the energy density of the electrochemical device having such a current collecting component. 2 Setting it to 0.04mm to 2mm can, on the one hand, improve the problem of greater processing difficulty caused by too small a distance, and on the other hand, alleviate the phenomenon of excessive overall space occupation by the current collecting component caused by too large a distance.

[0021] In a second aspect, the present application also provides an electrochemical device, comprising a housing assembly, an electrode assembly and the above-mentioned current collecting component; the housing assembly comprises an electrical lead-out portion; the electrode assembly is accommodated in the housing assembly, and the electrode assembly has a pole ear; the bottom wall is connected to the electrical lead-out portion, and the substrate is connected to the pole ear.

[0022] In the above technical solution, when the current collecting component adopts the above structure and is subjected to pressure during the connection process between the current collecting component and the electrical lead-out part of the housing assembly, the bending moment of the substrate acting on the bottom wall can be transferred to the angle formed between the first wall portion and the second wall portion, thereby reducing the bending moment exerted on the bottom wall, thereby effectively reducing the degree of convex deformation of the bottom wall, and further effectively reducing the risk of unreliable connection between the bottom wall of the current collecting component and the electrical lead-out part, thereby improving the connection reliability between the bottom wall and the electrical lead-out part, which is beneficial to improving the reliability and service life of the electrochemical device.

[0023] In some embodiments, the electrode assembly is a wound structure, the electrode assembly includes a first pole piece, the first pole piece includes a metal substrate and an active layer, the metal substrate includes a first region and a pole lug region, the active layer is arranged on the surface of the first region, the pole lug region is located at the end of the first pole piece in the width direction, the pole lug region is at least partially bent to form a first end face of the wound structure, and the first end face is connected to the substrate.

[0024] In the above technical solution, the tab area of ​​the first pole piece is bent to form a first end surface connected to the substrate of the current collecting component, which is beneficial to increase the connection area between the tab and the substrate, improve the current conduction capacity, and further improve the power performance of the electrochemical device.

[0025] In some embodiments, the housing assembly includes a shell and an end cap, one end of the shell forms an opening, the end cap covers the opening, the electrical lead portion is the shell, and the electrode assembly is accommodated in the shell.

[0026] In the above technical solution, the electrical lead connected to the current collecting member is the shell of the housing assembly, that is, the bottom wall of the current collecting member is connected to the shell. This structure is conducive to reducing the difficulty of assembling the electrochemical device.

[0027] In a third aspect, the present application also provides an electrical device, comprising the above-mentioned electrochemical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can also be obtained based on these drawings.

[0029] Figure 1 A schematic diagram of the structure of an electrochemical device provided in some embodiments of the present application;

[0030] Figure 2 An exploded view of the structure of an electrochemical device provided in some embodiments of the present application;

[0031] Figure 3 A partial cross-sectional view of an electrochemical device provided in some embodiments of the present application;

[0032] Figure 4 A schematic diagram of the structure of a current collecting component provided in some embodiments of the present application;

[0033] Figure 5 A cross-sectional view of a current collecting component provided in some embodiments of the present application.

[0034] Icon: 100-electrochemical device; 10-housing assembly; 11-shell; 111-opening; 112-accommodating space; 113-end wall; 12-end cover; 20-electrode assembly; 21-ear; 30-current collecting member; 31-substrate; 311-first surface; 312-second surface; 32-convex portion; 321-bottom wall; 322-side wall; 3221-first wall portion; 3222-second wall portion; 3223-angle; 323-cavity; X-thickness direction of substrate. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0040] In the present application, the electrochemical device may be a lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., which is not limited in the present embodiment. The electrochemical device may be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the present embodiment.

[0041] The electrochemical device includes a housing component, an electrode component and an electrolyte, and the housing component is used to contain the electrode component and the electrolyte. The electrode component is composed of a positive electrode sheet, a negative electrode sheet and a separator. The electrochemical device mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, and the part of the positive electrode collector not coated with the positive electrode active material layer is used as a positive electrode ear to realize the input or output of electric energy of the positive electrode sheet through the positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary material or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, and the part of the negative electrode collector not coated with the negative electrode active material layer is used as a negative electrode ear to realize the input or output of electric energy of the negative electrode sheet through the negative electrode ear. The negative electrode current collector may be made of copper, and the negative electrode active material may be made of carbon material or silicon material.

[0042] The material of the isolation film may be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, which is not limited in the embodiment of the present application.

[0043] For general cylindrical batteries, a current collecting component of a plate-like structure is usually provided between the electrode assembly and the shell assembly, and one side of the current collecting component is welded to the electrode lug of the electrode assembly, and the other side is welded to the end cap or shell of the shell assembly to achieve electrical connection between the electrode assembly and the shell assembly. However, the difficulty of welding the current collecting component with such a structure to the shell assembly after welding to the electrode lug of the electrode assembly is high, which is not convenient for manufacturing and processing. Therefore, in order to reduce the difficulty of welding between the current collecting component and the shell assembly, in the prior art, a protruding structure is stamped out on the current collecting component, and the protruding structure is protruding on the side of the current collecting component away from the electrode assembly, and the protruding structure is welded to the end cap or shell of the shell assembly to reduce the difficulty of welding between the current collecting component and the shell assembly. In the process of welding the current collecting component to the shell or end cap of the shell assembly, a certain pressure needs to be applied to the current collecting component so that the protruding structure can abut against the end cap or shell of the shell assembly, thereby ensuring the welding process between the current collecting component and the shell assembly. However, the inventors of the present application have discovered that when a current collecting component of this structure is subjected to pressure, the protruding structure used to abut the end cover of the outer shell assembly or the bottom wall of the shell will be subjected to the bending moment transmitted from the substrate and undergo a certain protruding deformation, thereby causing a large gap between the bottom wall of the protruding structure and the end cover or shell of the outer shell assembly, resulting in the phenomenon of cold welding or loose welding between the current collecting component and the outer shell assembly, making the connection reliability between the current collecting component and the outer shell assembly insufficient, affecting the reliability and service life of the electrochemical device.

[0044] Based on the above considerations, in order to solve the problem of poor welding or unreliable welding between the current collecting component and the housing assembly, the inventor has designed a current collecting component after in-depth research. The current collecting component includes a substrate and a convex portion. The substrate has a first surface and a second surface arranged opposite to each other along its thickness direction. The convex portion protrudes from the first surface. The convex portion includes a bottom wall and a side wall, and the side wall is connected between the substrate and the bottom wall. The side wall and the bottom wall enclose a cavity. Among them, the side wall includes a first wall portion and a second wall portion arranged in sequence along the thickness direction of the substrate. The first wall portion and the second wall portion are connected and form a fold at the connection position.

[0045] In a current collecting component of this structure, the side wall of the protrusion is set as a first wall portion and a second wall portion arranged along the thickness direction of the substrate, and the connection position of the first wall portion and the second wall portion is set as an angled structure, that is, a bending structure is formed on the side wall. When the current collecting component with this structure is subjected to pressure during the connection process between the current collecting component and the outer shell assembly, the bending moment of the substrate acting on the bottom wall can be transferred to the angle formed between the first wall portion and the second wall portion, thereby reducing the bending moment exerted on the bottom wall, thereby effectively reducing the degree of convex deformation of the bottom wall, reducing the risk of an unreliable connection between the bottom wall of the current collecting component and the outer shell assembly, and improving the connection reliability between the bottom wall and the outer shell assembly, thereby improving the reliability and service life of the electrochemical device having such a current collecting component.

[0046] The embodiments of the present application provide an electrical device that uses an electrochemical device as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and the like.

[0047] It should be noted that each electrochemical device can be a secondary battery or a primary battery; for example, it can be a lithium ion battery, a sodium ion battery or a magnesium ion battery, but is not limited thereto. The electrochemical device can be cylindrical, flat, rectangular or other shapes. For example, in Figure 1 middle, Figure 1 This is a schematic structural diagram of an electrochemical device 100 provided in some embodiments of the present application. The electrochemical device 100 is a cylindrical structure.

[0048] According to some embodiments of the present application, referring to Figure 1 , and please refer to Figure 2 and Figure 3 , Figure 2 The structure explosion diagram of the electrochemical device 100 provided in some embodiments of the present application is shown in FIG. Figure 3A partial cross-sectional view of an electrochemical device 100 provided in some embodiments of the present application. The electrochemical device 100 includes a housing assembly 10, an electrode assembly 20, and a current collecting member 30, wherein the housing assembly 10 includes an electrical lead-out portion, the electrode assembly 20 is accommodated in the housing assembly 10, the electrode assembly 20 has a tab 21, and the current collecting member 30 connects the electrical lead-out portion and the tab 21 to achieve electrical connection between the housing assembly 10 and the electrode assembly 20.

[0049] The housing component 10 can also be used to contain electrolytes, such as electrolytes. The housing component 10 can be in various structural forms, such as a cylinder, a cuboid, etc. For example, Figure 1 In the embodiment, the housing component 10 is a cylindrical structure. The housing component 10 can also be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0050] In some embodiments, the housing assembly 10 may include a shell 11 and an end cap 12, the shell 11 is a hollow structure with an opening 111 on one side, a receiving space 112 for receiving the electrode assembly 20 is formed inside the shell 11, and the opening 111 is connected to the receiving space 112, and the end cap 12 covers the opening 111 of the shell 11 and forms a sealed connection to form a sealed space for receiving the electrode assembly 20 and the electrolyte.

[0051] When assembling the electrochemical device 100 , the electrode assembly 20 may be placed in the housing 11 , and the housing 11 may be filled with electrolyte, and then the end cap 12 may be covered on the opening 111 of the housing 11 . Exemplarily, the end cap 12 may be welded to the housing 11 .

[0052] The shell 11 can be in various shapes, such as a cylinder, a cuboid, etc. The shape of the shell 11 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cylindrical structure, a cylindrical shell 11 can be selected; if the electrode assembly 20 is a cuboid structure, a cuboid shell 11 can be selected. Of course, the end cap 12 can also be in various structures, such as a plate-like structure.

[0053] The electrical lead-out portion of the housing assembly 10 may be an end cap 12 or a housing 11. Figure 2 and Figure 3In the embodiment, the electrical lead-out portion is the shell 11 of the housing assembly 10, one end of the shell 11 is formed with an opening 111, and the other end has an end wall 113 arranged opposite to the opening 111, and the electrode assembly 20 is formed with a pole ear 21 at one end close to the end wall 113, and the current collecting member 30 is arranged between the electrode assembly 20 and the end wall 113, and connects the end wall 113 of the shell 11 and the pole ear 21 of the electrode assembly 20, so as to realize the electrical connection between the shell 11 and the electrode assembly 20. Of course, in other embodiments, the current collecting member 30 can also be arranged between the electrode assembly 20 and the end cover 12, so as to connect the end cover 12 and the pole ear 21 of the electrode assembly 20 through the current collecting member 30. When the current collecting member 30 is connected to the end cover 12, and the output or input of the electric energy of the electrochemical device 100 is realized through the end cover 12, the current collecting member 30 can be directly connected to the end cover 12, or it can be connected to the electrode terminal arranged on the end cover 12, so as to realize the input or output of the electric energy of the electrochemical device 100.

[0054] Exemplarily, the current collecting component 30 and the electrical lead-out portion of the housing assembly 10 are welded to each other, so as to ensure the connection stability and reliability between the current collecting component 30 and the electrical lead-out portion of the housing assembly 10. It should be noted that when the current collecting component 30 and the electrical lead-out portion of the housing assembly 10 are welded to each other, a certain pressure needs to be applied to the current collecting component 30 so that the current collecting component 30 can be closely attached to the electrical lead-out portion of the housing assembly 10 to ensure the welding quality between the current collecting component 30 and the electrical lead-out portion of the housing assembly 10. For example, when the electrical lead-out portion of the housing assembly 10 is the end wall 113 of the housing assembly 10, a certain pressure needs to be applied to the current collecting component 30 so that the current collecting component 30 is closely attached to the end wall 113 of the housing assembly 10.

[0055] In some embodiments, there may be two current collecting components 30, and the electrode assembly 20 has two pole ears 21, namely a positive pole ear 21 and a negative pole ear 21, which are respectively used to output the positive output pole and the negative output pole of the electrode assembly 20, and the two pole ears 21 are respectively located at the two ends of the electrode assembly 20. One of the two current collecting components 30 is connected between the pole ear 21 at one end of the electrode assembly 20 and the end wall 113 of the shell 11, and the other current collecting component 30 is connected between the pole ear 21 at the other end of the electrode assembly 20 and the end cover 12, so as to realize the input and output of electrical energy of the electrochemical device 100.

[0056] It is understandable that the shell assembly 10 is not limited to the above structure, and the shell assembly 10 can also be other structures. For example, the shell assembly 10 includes a shell 11 and two end covers 12. The shell 11 is a hollow structure with openings 111 at both ends opposite to each other in a first direction. One end cover 12 corresponds to an opening 111 of the shell 11 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 20 and the electrolyte.

[0057] It should be noted that the electrode assembly 20 is a component in the electrochemical device 100 where an electrochemical reaction occurs. The electrode assembly 20 may include a negative electrode sheet, a separator, and a positive electrode sheet. The electrode assembly 20 may be a wound structure formed by winding the negative electrode sheet, the separator, and the positive electrode sheet, or a stacked structure formed by stacking the negative electrode sheet, the separator, and the positive electrode sheet. For example. Figure 2 In the embodiment, the electrode assembly 20 is a wound structure formed by winding a negative electrode sheet, a separator and a positive electrode sheet.

[0058] According to some embodiments of the present application, referring to Figure 2 and Figure 3 , and please refer to Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the structure of the current collecting component 30 provided in some embodiments of the present application. Figure 5 A cross-sectional view of a current collecting component 30 provided for some embodiments of the present application. The present application provides a current collecting component 30, which includes a substrate 31 and a convex portion 32. The substrate 31 has a first surface 311 and a second surface 312 arranged opposite to each other along the thickness direction X of the substrate. The convex portion 32 protrudes from the first surface 311, and the convex portion 32 includes a bottom wall 321 and a side wall 322. The side wall 322 is arranged around the bottom wall 321, and the side wall 322 connects the substrate 31 and the bottom wall 321, and the side wall 322 and the bottom wall 321 form a cavity 323. Among them, the side wall 322 includes a first wall portion 3221 and a second wall portion 3222 arranged in sequence along the thickness direction X of the substrate, and the first wall portion 3221 and the second wall portion 3222 are connected and form a fold 3223 at the connection position.

[0059] By setting the protrusion 32 to protrude from the first surface 311 of the substrate 31, the protrusion 32 includes a bottom wall 321 and a side wall 322, the side wall 322 is connected between the bottom wall 321 and the base, and the bottom wall 321 and the side wall 322 enclose a cavity 323, so that when the current collecting component 30 is used in the electrochemical device 100, the substrate 31 is connected to the electrode ear 21 of the electrode assembly 20, and the bottom wall 321 of the protrusion 32 is connected to the shell assembly 10, so as to achieve electrical connection between the electrode assembly 20 and the shell assembly 10, so as to reduce the difficulty of connecting the current collecting component 30 and the shell assembly 10. In addition, by setting the side wall 322 of the protrusion 32 to the first wall portion 3221 and the second wall portion 3222 arranged along the thickness direction X of the substrate, and setting the connection position of the first wall portion 3221 and the second wall portion 3222 to the structure of the angle 3223, that is, a bending structure is formed on the side wall 322. When the current collecting component 30 with such a structure is subjected to pressure during the connection process between the current collecting component 30 and the shell assembly 10, the bending moment acting on the bottom wall 321 by the substrate 31 can be transferred to the angle 3223 formed between the first wall portion 3221 and the second wall portion 3222, thereby reducing the bending moment exerted on the bottom wall 321, thereby effectively reducing the degree of convex deformation of the bottom wall 321, reducing the phenomenon of unreliable connection between the bottom wall 321 of the current collecting component 30 and the shell assembly 10, and improving the connection stability between the bottom wall 321 and the shell assembly 10, thereby improving the reliability and service life of the electrochemical device 100 having such a current collecting component 30.

[0060] Among them, when the current collecting member 30 is assembled into the housing assembly 10 of the electrochemical device 100, the second surface 312 of the substrate 31 is used to connect with the pole ear 21 of the electrode assembly 20 to realize the electrical connection between the electrode assembly 20 and the current collecting member 30, and it is beneficial to increase the connection area between the current collecting member 30 and the pole ear 21, reduce the contact resistance and the phenomenon of local overcurrent. The bottom wall 321 of the protrusion 32 is used to connect with the shell 11 or the end cover 12 of the housing assembly 10 to realize the electrical connection between the current collecting member 30 and the housing assembly 10. When the current collecting member 30 is connected to the shell 11 or the end cover 12 of the housing assembly 10, the pressure applied to the current collecting member 30 needs to act on the substrate 31, so that the pressure can be transmitted to the bottom wall 321 through the side wall 322, so that the bottom wall 321 is tightly fitted with the shell 11 or the end cover 12 of the housing assembly 10 to ensure the connection quality between the bottom wall 321 and the shell 11 or the end cover 12 of the housing assembly 10.

[0061] The convex portion 32 is a structure formed by a side wall 322 and a bottom wall 321. The side wall 322 is connected between the bottom wall 321 and the first surface 311 of the substrate 31 along the thickness direction X of the substrate, and the side wall 322 and the bottom wall 321 enclose a cavity 323. It should be noted that in Figure 5In the embodiment, the cavity 323 formed by the side wall 322 and the bottom wall 321 penetrates the second surface 312 of the substrate 31 along the thickness direction X of the substrate, so that the substrate 31 and the protrusion 32 form a groove at the position where the cavity 323 is located.

[0062] Optionally, the current collecting component 30 can be an integrally formed structure or a split structure. When the current collecting component 30 is an integrally formed structure, the current collecting component 30 can be manufactured by a stamping process or a casting process to form a convex portion 32 on the first surface 311 of the substrate 31, and the side wall 322 and the bottom wall 321 of the convex portion 32 are enclosed to form a cavity 323. For example, in this embodiment, the current collecting component 30 is made by a stamping process, and a convex structure protruding from one side of the plate is stamped on the plate by stamping the plate along the thickness direction of the plate, and a groove structure is formed on the other side of the convex structure. After the stamping is completed, the portion with the convex structure stamped out is the convex portion 32, and the portion not stamped is the substrate 31. When the current collecting component 30 is a split structure, the protrusion 32 can be connected to the first surface 311 of the substrate 31 through a welding process, and a through hole is opened at the position of the protrusion 32 corresponding to the substrate 31, so that the cavity 323 of the protrusion 32 passes through the second surface 312 of the substrate 31 from the first surface 311 of the substrate 31 along the thickness direction X of the substrate.

[0063] The side wall 322 includes a first wall portion 3221 and a second wall portion 3222 arranged in sequence along the thickness direction X of the substrate, that is, the side wall 322 is composed of at least two wall portions arranged along the thickness direction X of the substrate, and the at least two wall portions together form the side wall 322. Figure 4 and Figure 5 In the embodiment, the side wall 322 includes two wall portions arranged in sequence along the thickness direction X of the substrate, namely, a first wall portion 3221 and a second wall portion 3222, and the first wall portion 3221 is connected to the bottom wall 321, and the second wall portion 3222 is connected to the substrate 31. Of course, in some embodiments, the side wall 322 may include three, four, or five wall portions arranged in sequence and connected along the thickness direction X of the substrate.

[0064] The first wall portion 3221 and the second wall portion 3222 are connected to each other and form a bend 3223 at the connection position. That is, a bending structure is formed at the connection position of the first wall portion 3221 and the second wall portion 3222, that is, the first wall portion 3221 and the second wall portion 3222 are non-parallel structures to form an angle between the first wall portion 3221 and the second wall portion 3222.

[0065] For example, see Figure 4 and Figure 5As shown, the corner 3223 points to the cavity 323 , that is, the corner 3223 formed at the connection position of the first wall portion 3221 and the second wall portion 3222 is bent into the cavity 323 .

[0066] By setting the angle 3223 formed at the connection position between the first wall portion 3221 and the second wall portion 3222 to point to the cavity 323, the current collecting component 30 adopting this structure can further improve and reduce the bending moment exerted on the bottom wall 321, thereby helping to further reduce the degree of convex deformation of the bottom wall 321 during the connection process with the outer shell assembly 10.

[0067] According to some embodiments of this application, please continue to refer to Figure 4 and Figure 5 As shown, one end of the first wall portion 3221 away from the second wall portion 3222 is connected to the bottom wall 321, and one end of the second wall portion 3222 away from the first wall portion 3221 is connected to the substrate 31. The angle between the first wall portion 3221 and the bottom wall 321 is a, and the angle of the side of the corner 3223 facing the cavity 323 is γ, b = γ-(180°-a), satisfying that a < b.

[0068] Among them, one end of the first wall portion 3221 away from the second wall portion 3222 is connected to the bottom wall 321, and one end of the second wall portion 3222 away from the first wall portion 3221 is connected to the substrate 31, that is, the side wall 322 only includes two wall portions arranged along the thickness direction X of the substrate, namely the first wall portion 3221 and the second wall portion 3222, and the first wall portion 3221 is connected to the bottom wall 321, and the second wall portion 3222 is connected to the substrate 31, so that only a folded corner 3223 structure is formed on the side wall 322.

[0069] It should be noted that the angle formed between the first wall portion 3221 and the bottom wall 321 is a, that is, on a cross section perpendicular to the bottom wall 321 and passing through the geometric center of the bottom wall 321, the angle formed between the surface of the first wall portion 3221 facing the cavity 323 and the bottom wall 321 is a. Similarly, the angle of the side of the folded corner 3223 facing the cavity 323 is γ, that is, on a cross section perpendicular to the bottom wall 321 and passing through the geometric center of the bottom wall 321, the angle of the side of the folded corner 3223 facing the cavity 323 is γ.

[0070] b=γ-(180°-a), that is, γ minus the complementary angle to a. Therefore, b is the angle between the second wall portion 3222 and a plane passing through the vertex of the angle 3223 and located in the cavity 323 and parallel to the bottom wall 321 .

[0071] a<b, that is, the corner 3223 formed between the first wall portion 3221 and the second wall portion 3222 is bent into the cavity 323, so that in the direction from the bottom wall 321 to the substrate 31 along the thickness direction X of the substrate, the side wall 322 forms a trumpet shape that gradually folds toward the side away from the cavity 323.

[0072] The first wall portion 3221 and the second wall portion 3222 of the side wall 322 are respectively connected to the bottom wall 321 and the base plate 31. That is, only one corner 3223 is formed on the side wall 322, so that the stress condition of the bottom wall 321 can be improved while the processing and manufacturing difficulty can be reduced, so as to improve production efficiency and mass production. In addition, by setting b to be greater than a, b=γ-(180°-a), that is, the angle formed by the surface of the second wall portion 3222 facing the cavity 323 and the bottom wall 321 is greater than the angle formed by the surface of the first wall portion 3221 facing the cavity 323 and the bottom wall 321, so that the angle 3223 formed at the connection position between the first wall portion 3221 and the second wall portion 3222 is a structure bent into the cavity 323. This structure can better transfer the force of the substrate 31 to the angle 3223 and reduce the bending moment of the bottom wall 321, thereby reducing the degree of convex deformation of the bottom wall 321 during the connection process with the shell assembly 10.

[0073] According to some embodiments of the present application, Figure 5 As shown, 10°≤ba≤80°, that is, the angle formed by the surface of the second wall portion 3222 facing the cavity 323 and the bottom wall 321 is greater than the angle formed by the surface of the first wall portion 3221 facing the cavity 323 and the bottom wall 321, and the difference is between 10° and 80°.

[0074] Referring to the table below, 7 groups of experimental objects with different differences in the angle b formed between the surface of the second wall portion 3222 facing the cavity 323 and the bottom wall 321 and the angle a formed between the surface of the first wall portion 3221 facing the cavity 323 and the bottom wall 321 were used for the experiment. Among them, the substrate 31 and the bottom wall 321 are perpendicular to the thickness direction X of the substrate, so that the substrate 31 and the bottom wall 321 are parallel to each other. The distance between the substrate 31 and the bottom wall 321 is L 1 , that is, the length of the side wall 322 in the thickness direction X of the substrate is L 1 , L 1 =1.5mm. The distance between the connection position of the first wall portion 3221 and the second wall portion 3222 and the bottom wall 321 is L 2 , that is, the length of the first wall portion 3221 in the thickness direction X of the substrate is L 2 , L 2 / L 1=0.5. The pressure applied to the current collecting member 30 is 13N (i.e., the pressure applied to the substrate 31 is 13N). For the convenience of processing, a is set to 90°, and the difference between a and b is adjusted by changing the size of b. The experimental results are as follows:

[0075] Table 1

[0076]

[0077] In the actual manufacturing process, the protrusion height of the bottom wall 321 is less than 8μm, which is a qualified state, and can ensure the welding quality between the bottom wall 321 and the electrical lead-out part of the housing component 10. When the protrusion height of the bottom wall 321 exceeds 8μm, it will cause the phenomenon of cold welding or unreliable welding between the bottom wall 321 and the electrical lead-out part of the housing component 10. It can be seen from the above usage data that through the setting of the angle 3223, the protrusion height of the bottom wall 321 is less than 8μm, which can meet the manufacturing requirements. In addition, the difference between the angle formed by the surface of the second wall portion 3222 facing the cavity 323 and the bottom wall 321 and the angle formed by the surface of the first wall portion 3221 facing the cavity 323 and the bottom wall 321 is set at 20° to 70° for better results.

[0078] By setting the difference between the angle formed by the surface of the second wall portion 3222 facing the cavity 323 and the bottom wall 321 and the angle formed by the surface of the first wall portion 3221 facing the cavity 323 and the bottom wall 321 to 20° to 70°, the angle 3223 formed between the first wall portion 3221 and the second wall portion 3222 can better share the bending moment transmitted from the substrate 31 to the bottom wall 321, thereby further reducing the degree of convex deformation of the bottom wall 321 during the connection process with the shell component 10, thereby improving the connection reliability between the bottom wall 321 and the shell component 10.

[0079] According to some embodiments of the present application, Figure 5 As shown, 90°≤a≤135°, that is, the angle formed by the side of the first wall portion 3221 facing the cavity 323 and the bottom wall 321 is between 90° and 135°.

[0080] Refer to the table below, L 1 =1.5mm, L 2 / L 1 =0.5. The pressure value applied to the current collecting member 30 is 13N (i.e., the pressure value applied to the substrate 31 is 13N), and the angle b formed by the surface of the second wall portion 3222 facing the cavity 323 and the bottom wall 321 is set to 160°, and the angle a formed by the surface of the first wall portion 3221 facing the cavity 323 and the bottom wall 321 is different. The experiment was conducted on 7 groups of experimental objects, and the experimental results are as follows:

[0081] Table 2

[0082]

[0083] It can be seen from the above usage data that by setting the angle formed by the surface of the first wall portion 3221 facing the cavity 323 and the bottom wall 321 to 90° to 135°, on the one hand, it can alleviate the phenomenon that the first wall portion 3221 is inconvenient to process due to the angle formed by the surface of the first wall portion 3221 facing the cavity 323 and the bottom wall 321 being less than 90°, thereby helping to reduce the processing difficulty of the first wall portion 3221. On the other hand, it can reduce the phenomenon that the force condition of the bottom wall 321 is not well improved due to the excessively large angle formed by the surface of the first wall portion 3221 facing the cavity 323 and the bottom wall 321.

[0084] According to some embodiments of the present application, Figure 5 As shown, 100°≤b≤170°, that is, the angle formed by the side of the second wall portion 3222 facing the cavity 323 and the bottom wall 321 is between 100° and 170°. In addition, it can be seen from Table 1 that the effect is better when 110°≤b≤160°.

[0085] By setting the angle formed by the surface of the second wall portion 3222 facing the cavity 323 and the bottom wall 321 to 110° to 160°, on the one hand, the phenomenon that the degree of bending between the second wall portion 3222 and the substrate 31 is too large due to the angle formed by the surface of the second wall portion 3222 facing the cavity 323 and the bottom wall 321 is too small, making processing more difficult, can be alleviated; on the other hand, the phenomenon that the second wall portion 3222 and the substrate 31 tend to be parallel due to the angle formed by the surface of the second wall portion 3222 facing the cavity 323 and the bottom wall 321 is too large can be reduced, thereby resulting in a poor effect of the angle 3223 formed between the first wall portion 3221 and the second wall portion 3222 in sharing the bending moment transmitted from the substrate 31 to the bottom wall 321.

[0086] According to some embodiments of the present application, see Figure 5 As shown, along the thickness direction X of the substrate, the distance between the substrate 31 and the bottom wall 321 is L 1 The distance between the connection position of the first wall portion 3221 and the second wall portion 3222 and the bottom wall 321 is L 2 , satisfying, 0.1≤L 2 / L 1 ≤0.9.

[0087] As shown in the table below, the pressure value applied to the current collecting member 30 is 13N (that is, the pressure value applied to the substrate 31 is 13N), and 9 groups of experimental objects with different ratios of the distance between the connection position of the first wall portion 3221 and the second wall portion 3222 and the bottom wall 321 to the distance between the substrate 31 and the bottom wall 321 are used for experiments, among which L1 =1.5mm, the experimental results are as follows:

[0088] Table 3

[0089]

[0090]

[0091] It can be seen from the above usage data that it is better to set the distance between the connection position of the first wall portion 3221 and the second wall portion 3222 and the bottom wall 321 to account for 20% to 80% of the distance between the base plate 31 and the bottom wall 321 .

[0092] By setting the distance between the connection position of the first wall portion 3221 and the second wall portion 3222 and the bottom wall 321 to 20% to 80% of the distance between the substrate 31 and the bottom wall 321, so that the angle 3223 formed between the first wall portion 3221 and the second wall portion 3222 is located near the middle of the side wall in the thickness direction X of the substrate, on the one hand, the processing difficulty of the current collecting component 30 can be reduced, and on the other hand, the angle 3223 formed between the first wall portion 3221 and the second wall portion 3222 can better share the bending moment transmitted from the substrate 31 to the bottom wall 321, thereby better reducing the degree of convex deformation of the bottom wall 321 during the connection process with the outer shell assembly 10.

[0093] In some embodiments, Figure 5 As shown, 0.2mm≤L 1 ≤5mm, that is, the distance between the substrate 31 and the bottom wall 321 is 0.2mm to 5mm. By setting the distance between the substrate 31 and the bottom wall 321 to 0.2mm to 5mm, on the one hand, the problem of greater processing difficulty caused by too small a distance can be improved, and on the other hand, the phenomenon of too large a space occupied by the current collecting member 30 caused by too large a distance can be alleviated, so as to improve the energy density of the electrochemical device 100 having such a current collecting member 30.

[0094] In some embodiments, Figure 5 As shown, 0.04mm≤L 2 ≤2mm, that is, the distance between the connection position of the first wall portion 3221 and the second wall portion 3222 and the bottom wall 321 is 0.04mm to 2mm. By setting the distance between the connection position of the first wall portion 3221 and the second wall portion 3222 and the bottom wall 321 to 0.04mm to 2mm, on the one hand, the problem of greater processing difficulty caused by too small a distance can be improved, and on the other hand, the phenomenon of excessive overall space occupation of the current collecting member 30 caused by too large a distance can be alleviated.

[0095] According to some embodiments of the present application, see Figure 5 As shown, the base plate 31 and the bottom wall 321 are parallel to each other.

[0096] The substrate 31 and the bottom wall 321 are parallel to each other, that is, the substrate 31 and the bottom wall 321 are arranged at intervals along the thickness direction X of the substrate, and the substrate 31 and the bottom wall 321 are perpendicular to the thickness direction X of the substrate.

[0097] By arranging the substrate 31 and the bottom wall 321 of the current collecting component 30 to be parallel to each other, the current collecting component 30 with such a structure is easy to process and manufacture, which is conducive to mass production. On the other hand, when the current collecting component 30 is used in the electrochemical device 100, it is convenient to connect the substrate 31 with the electrode ear 21 of the electrode assembly 20, and to connect the bottom wall 321 with the outer shell assembly 10.

[0098] According to some embodiments of the present application, see Figure 2 and Figure 3 As shown, the embodiment of the present application also provides an electrochemical device 100, including a housing assembly 10, an electrode assembly 20 and a current collecting member 30 of any of the above schemes. The housing assembly 10 includes an electrical lead-out portion, the electrode assembly 20 is accommodated in the housing assembly 10, and the electrode assembly 20 has a tab 21. The bottom wall 321 of the protrusion 32 of the current collecting member 30 is connected to the electrical lead-out portion, and the substrate 31 of the current collecting member 30 is connected to the tab 21.

[0099] For example, in Figure 3 In the embodiment, the second surface 312 of the substrate 31 is connected to the tab 21 .

[0100] It should be noted that the relevant structure of the housing assembly 10 can refer to the housing assembly 10 provided in the aforementioned embodiments, and will not be described in detail here.

[0101] The electrochemical device 100 is provided with a current collecting component 30 of any of the above schemes. The electrical connection between the electrode assembly 20 and the shell assembly 10 can be achieved by connecting the substrate 31 of the current collecting component 30 to the electrode ear 21, and connecting the bottom wall 321 of the protrusion 32 of the current collecting component 30 to the electrical lead-out portion of the shell assembly 10, so as to reduce the difficulty of connecting the current collecting component 30 to the shell assembly 10. In addition, when the current collecting component 30 adopting this structure is subjected to pressure during the connection process between the current collecting component 30 and the electrical lead-out part of the housing assembly 10, the bending moment acting on the bottom wall 321 by the substrate 31 can be transferred to the angle 3223 formed between the first wall portion 3221 and the second wall portion 3222, so as to improve the stress condition of the bottom wall 321, thereby effectively reducing the degree of convex deformation of the bottom wall 321, and further effectively reducing the risk of an unreliable connection between the bottom wall 321 of the current collecting component 30 and the electrical lead-out part, thereby improving the connection stability between the bottom wall 321 and the electrical lead-out part, which is beneficial to improving the reliability and service life of the electrochemical device 100.

[0102] In some embodiments, the electrode assembly 20 is a wound structure, and the electrode assembly 20 includes a first pole piece, the first pole piece includes a metal substrate and an active layer, the metal substrate includes a first region and a pole ear region, the active layer is arranged on the surface of the first region, the pole ear region is located at the end of the width direction of the first pole piece, the pole ear region is at least partially bent to form a first end face of the wound structure, and the first end face is connected to the substrate 31.

[0103] By bending the tab area of ​​the first pole piece as the tab 21 of the electrode assembly 20 to form a first end surface connected to the substrate 31 of the current collecting component 30, it is beneficial to increase the connection area between the tab 21 and the substrate 31, improve the current conduction capacity, and thus improve the power performance of the electrochemical device 100.

[0104] In some embodiments, the first electrode plate is a negative electrode plate.

[0105] According to some embodiments of this application, please continue to refer to Figure 2 and Figure 3 As shown, the housing assembly 10 includes a shell 11 and an end cover 12 . An opening 111 is formed at one end of the shell 11 . The end cover 12 covers the opening 111 . The electrical lead-out portion is the shell 11 . The electrode assembly 20 is accommodated in the shell 11 .

[0106] The electrical lead-out portion is the housing 11 , that is, the bottom wall 321 of the protrusion 32 is connected to the housing 11 .

[0107] For example, in Figure 3 In the figure, the bottom wall 321 of the protrusion 32 is connected to the end wall 113 of the shell 11 which is arranged opposite to the opening 111. With this structure, the shell 11, the current collecting member 30 and the electrode assembly 20 of the outer shell assembly 10 can be assembled first, and then the end cover 12 can be covered on the opening 111 of the shell 11, which is conducive to reducing the difficulty of assembling the electrochemical device 100.

[0108] It should be noted that, in other embodiments, the electrical lead-out portion of the housing assembly 10 may also be the end cover 12 of the housing assembly 10 , that is, the bottom wall 321 of the protrusion 32 is connected to the end cover 12 .

[0109] According to some embodiments of the present application, the embodiments of the present application further provide an electrical device, comprising the electrochemical device 100 of any of the above schemes, and the electrochemical device 100 is used to provide electrical energy to the electrical device.

[0110] The electrical device may be any of the aforementioned devices or systems using the electrochemical device 100 .

[0111] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0112] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A current collecting component, characterized in that: include: A substrate having a first surface and a second surface arranged opposite to each other in a thickness direction thereof; as well as a convex portion protruding from the first surface, the convex portion comprising a bottom wall and a side wall, the side wall connecting the substrate and the bottom wall, and the side wall and the bottom wall forming a cavity; Wherein, the side wall includes a first wall portion and a second wall portion arranged in sequence along the thickness direction of the substrate, the first wall portion and the second wall portion are connected and form an angle at the connection position, the end of the first wall portion away from the second wall portion is connected to the bottom wall, and the end of the second wall portion away from the first wall portion is connected to the substrate, the angle between the first wall portion and the bottom wall is a, and the angle of the angle facing the side of the cavity is γ, b=γ-(180°-a), satisfying, a<b, and 10°≤ba≤80°.

2. The current collecting component according to claim 1, characterized in that: Satisfy at least one of the following conditions: (1) The folded corner points to the cavity; (2) The base plate and the bottom wall are parallel to each other.

3. The current collecting component according to claim 1, characterized in that: Satisfy at least one of the following conditions: (1)90°≤a≤135°； (2)100°≤b≤170°。 4. The current collecting component according to claim 3, characterized in that: Satisfy at least one of the following conditions: (1) 20°≤ba≤70°; (2)110°≤b≤160°。 5. The current collecting component according to claim 1, characterized in that: Along the thickness direction of the substrate, the distance between the substrate and the bottom wall is L1, and the distance between the connection position of the first wall portion and the second wall portion and the bottom wall is L2, satisfying at least one of the following conditions: (1) 0.1≤L2 / L1≤0.9; (2) 0.2mm≤L1≤5mm; (3)0.04mm≤L2≤2mm.

6. The current collecting component according to claim 5, characterized in that: 0.2≤L2 / L1≤0.

8.

7. An electrochemical device, characterized in that: include: A housing assembly including an electrical lead-out portion; An electrode assembly, contained in the housing assembly, wherein the electrode assembly has a tab; as well as According to any one of claims 1 to 6, the bottom wall is connected to the electrical lead-out portion, and the substrate is connected to the electrode tab.

8. The electrochemical device according to claim 7, characterized in that Satisfy at least one of the following conditions: (1) The electrode assembly is a wound structure, comprising a first electrode sheet, the first electrode sheet comprising a metal substrate and an active layer, the metal substrate comprising a first region and a tab region, the active layer being disposed on a surface of the first region, the tab region being located at an end portion in a width direction of the first electrode sheet, the tab region being at least partially bent to form a first end face of the wound structure, and the first end face being connected to the substrate; (2) The housing assembly includes a shell and an end cover, one end of the shell forms an opening, the end cover covers the opening, the electrical lead portion is the shell, and the electrode assembly is accommodated in the shell.

9. An electrical device, characterized in that: Comprising the electrochemical device according to claim 7 or 8.

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