WO2024026635A1

WO2024026635A1 - Current collecting member, electrochemical device and electric device

Info

Publication number: WO2024026635A1
Application number: PCT/CN2022/109505
Authority: WO
Inventors: 陈腾腾
Original assignee: 宁德新能源科技有限公司
Priority date: 2022-08-01
Filing date: 2022-08-01
Publication date: 2024-02-08
Also published as: CN116848720A

Abstract

Provided in the present application are a current collecting member, an electrochemical device and an electric device. The current collecting member comprises a base plate and a convex portion. The base plate has a first surface and a second surface, which are arranged opposite each other in the thickness direction of the base plate. The convex portion protrudes from the first surface, and comprises a bottom wall and a side wall, wherein the side wall is connected to the base plate and the bottom wall, and a cavity is formed by means of enclosure of the side wall and the bottom wall. The side wall comprises a first wall portion and a second wall portion, which are sequentially arranged in the thickness direction of the base plate, wherein the first wall portion and the second wall portion are connected and form a folding angle at the connecting position thereof. By using the current collecting member, when a pressure is applied to the current collecting member in a connection process of the current collecting member and a housing assembly, a bending moment acting on the bottom wall by means of the base plate can be transferred to the position where the folding angle connected between the first wall portion and the second wall portion is located, such that the degree of convex deformation of the bottom wall can be effectively reduced, thereby reducing the risk of unstable connection between the bottom wall of the current collecting member and the housing assembly.

Description

Current collecting components, electrochemical devices and electrical devices

Technical field

The present application relates to the field of battery technology, specifically, to a current collecting component, an electrochemical device and an electrical device.

Background technique

Cylindrical batteries are widely used in electric vehicles, electric two-wheelers, power tools and other fields due to their advantages of easy manufacturing and good safety. Usually, a current collecting member is welded between the shell component and the electrode component of the cylindrical battery. The flow member provides electrical connection between the electrode assembly and the housing assembly.

Contents of the invention

The inventor of the present application has discovered that in the prior art, during the production and assembly process of cylindrical batteries, it is easy for the current collecting component and the shell component to have a weak or unreliable welding, resulting in a gap between the current collecting component and the shell component. The connection reliability between them is insufficient, which in turn affects the reliability and service life of the electrochemical device.

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.

In a first aspect, the present application provides a current collecting member, including a base plate and a convex portion; the base plate has a first surface and a second surface arranged oppositely along its thickness direction; the convex portion protrudes from the first surface , the convex part includes a bottom wall and a side wall, the side wall connects the base plate and the bottom wall, and the side wall and the bottom wall enclose a cavity; wherein the side wall includes a cavity along the The first wall portion and the second wall portion are arranged sequentially in the thickness direction of the substrate. The first wall portion and the second wall portion are connected and form a folded corner at the connecting position.

In the above technical solution, by arranging the side walls of the convex portion as the first wall portion and the second wall portion arranged along the thickness direction of the substrate, and arranging the connection position of the first wall portion and the second wall portion as a folded corner structure, that is, a bending structure is formed on the side wall. The current collecting component using this structure can cause the base plate to act on the bending on the bottom wall when pressure is applied during the connection process between the current collecting component and the housing assembly. The moment is transferred to the corner connecting the first wall and the second wall, reducing the bending moment on the bottom wall, thereby effectively reducing the degree of convex deformation of the bottom wall and reducing the gap between the bottom wall and the shell of the current collecting component. There is a risk of unreliable connections between components, which improves the reliability of the connection between the bottom wall and the housing component, thereby improving the reliability and service life of the electrochemical device with such a current collecting component.

In some embodiments, the knuckle points toward the cavity.

In the above technical solution, the angle formed by the connection position of the first wall part and the second wall part is set to point towards the cavity, that is to say, the angle formed by the connection position of the first wall part and the second wall part points towards the cavity. By bending in the cavity, the current collecting member with this structure can further reduce the bending moment experienced by the bottom wall, which is helpful to further reduce the degree of convex deformation of the bottom wall during the connection process with the housing assembly.

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

In the above technical solution, by arranging the base plate and the bottom wall of the current collecting member parallel to each other, on the one hand, it facilitates processing and manufacturing, and on the other hand, it can facilitate the connection between the base plate and the tabs of the electrode assembly and the connection between the bottom wall and the housing assembly. .

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 and the bottom wall is a, the angle of the side of the fold facing the cavity is γ, b=γ-(180°-a), satisfying, a< b.

In the above technical solution, b is the angle between a plane parallel to the bottom wall and the second wall that passes through the vertex of the folded angle and is located in the cavity. By setting b to be greater than a, b=γ-(180 °-a), that is to say, the folding angle formed at the connection position of the first wall part and the second wall part is a structure that is bent into the cavity. This structure can better transfer the force of the substrate to the folding 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 component.

In some embodiments, 10°≤b-a≤80°. In some embodiments, 20°≤b-a≤70°.

In the above technical solution, by setting the value of b-a between 20° and 70°, the angle formed between the first wall part and the second wall part can better share the bending moment transmitted from the base plate to the bottom wall, This can further reduce the degree of convex deformation of the bottom wall during the connection processing with the shell component, and improve the connection reliability between the bottom wall and the shell component.

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

In the above technical solution, by setting the angle between the first wall and the bottom wall at 90° to 135°, on the one hand, it can alleviate the problem caused by the angle between the first wall and the bottom wall being less than 90°. This phenomenon is inconvenient to process, thus helping to reduce the difficulty of processing the first wall. That is to say, when the angle between the first wall and the bottom wall is less than 90°, the first wall will have a structure that is tilted into the cavity. , which makes the processing of the first wall part more difficult. On the other hand, it can reduce the phenomenon that the stress condition of the bottom wall is not improved due to an excessive angle between the first wall part and the bottom wall. In addition, by setting the included angle between the second wall portion and the bottom wall to be between 110° and 160°, on the one hand, it is possible to alleviate the friction between the second wall portion and the substrate caused by the too small included angle between the second wall portion and the bottom wall. Excessive bending degree makes processing more difficult. On the other hand, it can reduce the phenomenon that the second wall and the substrate tend to be parallel due to the excessive angle between the second wall and the bottom wall, resulting in the first wall The folding angle between the base plate and the second wall portion does not have a good effect in sharing the bending moment transmitted from the base plate to the bottom wall.

In some embodiments, along the thickness direction of the substrate, the distance between the substrate and the bottom wall is L ₁ , and the connection position of the first wall part and the second wall part is in contact with the bottom wall. The distance between the walls is L ₂ , which satisfies: 0.1≤L ₂ /L ₁ ≤0.9. In some embodiments, 0.2≤L ₂ /L ₁ ≤0.8.

In the above technical solution, by setting the distance between the connection position of the first wall part and the second wall part and the bottom wall to account for 20% to 80% of the distance between the base plate and the bottom wall, so that the first wall The folded angle formed between the first wall portion and the second wall portion is located at a position close to the middle of the side wall in the thickness direction of the substrate. On the one hand, it can reduce the processing difficulty of the current collecting member, and on the other hand, it can make the first wall portion and the second wall portion The folded angles formed therebetween can better share the bending moment transmitted from the base plate to the bottom wall, thereby better reducing the degree of convex deformation of the bottom wall during the connection process with the housing component.

In some embodiments, 0.2mm≤L ₁ ≤5mm. In some embodiments, _{0.04mm≤L2≤2mm} .

In the above technical solution, by setting the distance L ₁ between the substrate and the bottom wall at 0.2 mm to 5 mm, on the one hand, the problem of difficulty in processing due to too small distance can be improved, and on the other hand, the problem of too small distance can be alleviated. The large size causes the space occupied by the current collecting component to be too large, in order to increase the energy density of the electrochemical device having such a current collecting component. In addition, by setting the distance L ₂ between the connection position of the first wall part and the second wall part and the bottom wall to 0.04 mm to 2 mm, on the one hand, the problem of difficulty in processing due to too small distance can be improved, and on the other hand, the problem of difficulty in processing due to too small distance can be improved. On the one hand, it can alleviate the phenomenon that the overall space occupied by the current collection component is too large due to excessive distance.

In a second aspect, the present application also provides an electrochemical device, including a housing assembly, an electrode assembly and the above-mentioned current collecting member; the housing assembly includes an electrical lead-out portion; the electrode assembly is accommodated in the housing assembly, and the The electrode assembly has tabs; the bottom wall is connected to the electrical lead-out portion, and the substrate is connected to the tabs.

In the above technical solution, the current collecting member with the above structure can transfer the bending moment of the base plate acting on the bottom wall to the first wall when it is pressed during the connection process between the current collecting member and the electrical lead-out part of the housing assembly. The bending angle formed between the second wall part and the second wall part reduces the bending moment experienced by the bottom wall, thereby effectively reducing the degree of convex deformation of the bottom wall, and thereby effectively reducing the gap between the bottom wall of the current collecting component and the electrical lead-out part. There is a risk of unreliable connections. Improving the reliability of the connection between the bottom wall and the electrical lead-out is beneficial to improving the reliability and service life of the electrochemical device.

In some embodiments, the electrode assembly is a rolled 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 The tab area, the active layer is provided on the surface of the first area, the tab area is located at the end of the width direction of the first pole piece, the tab area is at least partially bent to form the The first end surface of the rolled structure is connected to the substrate.

In the above technical solution, the tab area of the first pole piece is bent to form a connection between the first end surface and the substrate of the current collecting member, which is beneficial to increasing the connection area between the tab and the substrate, improving the current conductivity, and thereby improving the electrochemical The power performance of the device.

In some embodiments, the housing assembly includes a housing and an end cover, one end of the housing forms an opening, the end cover covers the opening, the electrical lead-out part is the housing, and the The electrode assembly is contained in the housing.

In the above technical solution, the electrical lead-out part connected to the current collecting component is the shell of the housing assembly. That is to say, the bottom wall of the current collecting component is connected to the housing. This structure is beneficial to reducing the difficulty of assembling the electrochemical device. .

In a third aspect, the present application also provides an electrical device, including the above electrochemical device.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other relevant drawings can also be obtained from these drawings.

Figure 1 is a schematic structural diagram of an electrochemical device provided by some embodiments of the present application;

Figure 2 is an exploded view of the structure of an electrochemical device provided by some embodiments of the present application;

Figure 3 is a partial cross-sectional view of an electrochemical device provided by some embodiments of the present application;

Figure 4 is a schematic structural diagram of a current collecting component provided by some embodiments of the present application;

Figure 5 is a cross-sectional view of a current collecting component provided by some embodiments of the present application.

Icon: 100-electrochemical device; 10-shell assembly; 11-casing; 111-opening; 112-accommodating space; 113-end wall; 12-end cover; 20-electrode assembly; 21-pole lug; 30-set Flow member; 31-base plate; 311-first surface; 312-second surface; 32-convex portion; 321-bottom wall; 322-side wall; 3221-first wall portion; 3222-second wall portion; 3223- Corner; 323-cavity; X-thickness direction of the substrate.

Detailed ways

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 present application. Examples, not all examples. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of this application.

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

In the description of this application, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection" and "attachment" should be understood in a broad sense. For example, it can be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediate medium; it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

The term "and/or" in this application is just an association relationship describing related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, alone There are three situations B. In addition, the character "/" in this application generally indicates that the related objects are an "or" relationship.

In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of simplicity, detailed descriptions of the same components in different embodiments are omitted. 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 and width of the integrated device, are only illustrative illustrations and should not constitute any limitation to the present application. .

In this application, the electrochemical device may be a lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the embodiments of this application are not limited to this. The electrochemical device may be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of the present application are not limited thereto.

The electrochemical device includes a housing assembly, an electrode assembly and an electrolyte. The housing assembly is used to accommodate the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode piece, a negative electrode piece and an isolation film. Electrochemical devices mainly rely on the movement of metal ions between positive and negative electrode plates to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The part of the positive electrode current collector that is not coated with the positive electrode active material layer serves as a positive electrode tab to realize the operation through the positive electrode tab. The electrical energy input or output of the positive pole piece. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary materials or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The part of the negative electrode current collector that is not coated with the negative electrode active material layer serves as a negative electrode tab to achieve the goal through the negative electrode tab. The electrical energy input or output of the negative pole piece. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon material or silicon material.

The material of the isolation film can be polypropylene (PP) or polyethylene (PE). In addition, the electrode assembly may have a rolled structure or a laminated structure, which is not limited in the embodiments of the present application.

For a general cylindrical battery, a current collecting member with a plate-like structure is usually provided between the electrode assembly and the casing assembly, and one side of the current collecting member is welded to the tab of the electrode assembly, and the other side is welded to the casing assembly. The end cap or shell is welded to realize the electrical connection between the electrode assembly and the shell assembly. However, it is difficult to weld the current collector component of this structure to the tab of the electrode assembly and then to the shell assembly. Inconvenient to manufacture and process. Therefore, in order to reduce the difficulty of welding between the current collecting component and the housing component, in the prior art, a protruding structure is punched out on the current collecting component, and the protruding structure is protruding on a side of the current collecting component away from the electrode assembly. side, and weld the protruding structure to the end cover or shell of the housing component to reduce the difficulty of welding between the current collecting component and the housing component. During the welding process of the current collecting member and the shell or end cover of the housing assembly, a certain pressure needs to be applied to the current collecting member so that the protruding structure can abut against the end cover or shell of the housing assembly, thereby ensuring that the current collecting member is Welding process between flow members and housing components. However, the inventor of the present application found through research that when the current collecting member of this structure is under pressure, the protruding structure used to abut the end cover of the housing assembly or the bottom wall of the housing will be affected by the bending moment transmitted from the base plate. A certain amount of convex deformation occurs, resulting in a large gap between the bottom wall of the convex structure and the end cover or shell of the housing component, resulting in a weak or unreliable weld between the current collecting component and the housing component. phenomenon, which makes the connection reliability between the current collecting component and the housing component insufficient, affecting the reliability and service life of the electrochemical device.

Based on the above considerations, in order to solve the problem of weak welding or unreliable welding between the current collecting component and the housing component, the inventor designed a current collecting component after in-depth research. The current collecting component includes a base plate and a convex part, and the base plate has The first surface and the second surface are arranged oppositely along the thickness direction, and 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 base plate and the bottom wall. The side wall and the bottom wall Enclosed to form a cavity. Wherein, the side wall includes a first wall part and a second wall part arranged sequentially along the thickness direction of the substrate. The first wall part and the second wall part are connected and form a folded angle at the connection position.

In the current collecting member of this structure, by arranging the side walls of the convex portion as the first wall portion and the second wall portion arranged along the thickness direction of the substrate, and connecting the first wall portion and the second wall portion The position is set as a angled structure, that is to say, a bending structure is formed on the side wall. The current collecting component using this structure can force the base plate to the bottom when pressure is applied during the connection process between the current collecting component and the housing assembly. The bending moment on the wall is transferred to the corner formed between the first wall part and the second wall part, reducing the bending moment on the bottom wall, thereby effectively reducing the degree of convex deformation of the bottom wall and reducing the damage of the current collecting component. There is a risk of unreliable connection between the bottom wall and the housing component, thereby improving the reliability of the connection between the bottom wall and the housing component, thereby improving the reliability and service life of the electrochemical device with such a current collecting component.

Embodiments of the present application provide an electrical device that uses an electrochemical device as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. .

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 in the shape of a cylinder, a flat body, a cuboid or other shapes. For example, in FIG. 1 , FIG. 1 is a schematic structural diagram of an electrochemical device 100 provided by some embodiments of the present application. The electrochemical device 100 has a cylindrical structure.

According to some embodiments of the present application, refer to Figure 1, and please further refer to Figures 2 and 3. Figure 2 is an exploded view of the structure of the electrochemical device 100 provided by some embodiments of the present application, and Figure 3 is provided by some embodiments of the present application. A partial cross-sectional view of the electrochemical device 100. The electrochemical device 100 includes a housing assembly 10, an electrode assembly 20, and a current collecting member 30. 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 tabs 21. The current collecting member 30 is connected to the electrical outlet. The lead-out portion and the tab 21 are used to realize the electrical connection between the housing assembly 10 and the electrode assembly 20 .

The housing assembly 10 can also be used to contain electrolyte, such as electrolyte. The housing component 10 can be in various structural forms, such as a cylinder, a cuboid, etc. For example, in FIG. 1 , 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.

In some embodiments, the housing assembly 10 may include a housing 11 and an end cover 12 . The housing 11 is a hollow structure with an opening 111 on one side. An accommodating space 112 for accommodating the electrode assembly 20 is formed inside the housing 11 , and the opening 111 Communicated with the accommodating space 112, the end cover 12 covers the opening 111 of the housing 11 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 20 and the electrolyte.

When assembling the electrochemical device 100 , the electrode assembly 20 can be first placed into the casing 11 , the electrolyte is filled into the casing 11 , and then the end cap 12 is closed with the opening 111 of the casing 11 . For example, the end cover 12 is welded to the housing 11 .

The housing 11 can be in various shapes, such as cylinder, rectangular parallelepiped, etc. The shape of the housing 11 can be determined according to the specific shape of the electrode assembly 20 . For example, if the electrode assembly 20 has a cylindrical structure, a cylindrical housing 11 can be used; if the electrode assembly 20 has a rectangular parallelepiped structure, a rectangular parallelepiped housing 11 can be used. Of course, the end cap 12 can also have various structures. For example, the end cap 12 can have a plate-like structure.

The electrical lead-out part of the housing assembly 10 may be the end cover 12 or the housing 11 . For example, in Figures 2 and 3, the electrical lead-out part is the housing 11 of the housing assembly 10. One end of the housing 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 tab 21 at one end close to the end wall 113. The current collecting member 30 is disposed between the electrode assembly 20 and the end wall 113, and connects the end wall 113 of the housing 11 and the tab 21 of the electrode assembly 20 to achieve Electrical connection between housing 11 and electrode assembly 20. Of course, in other embodiments, the current collecting member 30 may also be disposed between the electrode assembly 20 and the end cover 12 to connect the end cover 12 and the tab 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 realizes the output or input of electric energy of the electrochemical device 100 through the end cover 12, the current collecting member 30 may be directly connected to the end cover 12, or may be disposed on the end cover. The electrode terminals on 12 are connected to realize the input or output of electric energy of the electrochemical device 100 .

For example, the current collection member 30 and the electrical lead-out portion of the housing assembly 10 are welded to each other, thereby ensuring the stability and reliability of the connection between the current collection member 30 and the electrical lead-out portion of the housing assembly 10 . It should be noted that when welding the current collecting member 30 and the electrical lead-out portion of the housing assembly 10 to each other, a certain pressure needs to be applied to the current collecting member 30 so that the current collecting member 30 can closely fit the electrical lead of the housing assembly 10 . on the lead-out portion 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 outlet 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 member 30 so that the current collecting member 30 closely fits the end wall 113 of the housing assembly 10 .

In some embodiments, there may be two current collecting members 30 , and the electrode assembly 20 has two tabs 21 , namely a positive tab 21 and a negative tab 21 , respectively used for the positive and negative output poles of the output electrode assembly 20 . For the negative output pole, the two tabs 21 are respectively located at both ends of the electrode assembly 20. One of the two current collecting members 30 is connected between the tab 21 at one end of the electrode assembly 20 and the end wall 113 of the housing 11. In the meantime, another current collecting member 30 is connected between the tab 21 at the other end of the electrode assembly 20 and the end cover 12 to realize the input and output of electric energy of the electrochemical device 100 .

It can be understood that the housing assembly 10 is not limited to the above-mentioned structure, and the housing assembly 10 can also be of other structures. For example, the housing assembly 10 includes a housing 11 and two end caps 12 , and the housing 11 is opposite to each other in the first direction. It has a hollow structure with openings 111 at both ends, and an end cover 12 is correspondingly covered with an opening 111 of the housing 11 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 20 and the electrolyte.

It should be noted that the electrode assembly 20 is a component that causes electrochemical reactions in the electrochemical device 100 . The electrode assembly 20 may include a negative electrode tab, a separator film, and a positive electrode tab. The electrode assembly 20 may be a rolled structure formed by winding the negative electrode sheet, the isolation film and the positive electrode sheet, or may be a stacked structure formed by a stacked arrangement of the negative electrode sheet, the isolation film and the positive electrode sheet. Exemplary. In FIG. 2 , the electrode assembly 20 is a rolled structure formed by winding a negative electrode piece, a separator film and a positive electrode piece.

According to some embodiments of the present application, refer to Figures 2 and 3, and please further refer to Figures 4 and 5. Figure 4 is a schematic structural diagram of the current collecting member 30 provided in some embodiments of the present application, and Figure 5 is a schematic diagram of some implementations of the present application. A cross-sectional view of the current collecting member 30 is provided in the example. The present application provides a current collecting member 30 , which includes a base plate 31 and a convex portion 32 . The substrate 31 has a first surface 311 and a second surface 312 arranged oppositely along the thickness direction X of the substrate. The convex part 32 protrudes from the first surface 311. The convex part 32 includes a bottom wall 321 and a side wall 322. The side wall 322 is surrounded by the bottom wall 321. The side wall 322 connects the base plate 31 and the bottom wall 321. The side wall 322 and The bottom wall 321 encloses a cavity 323. The side wall 322 includes a first wall portion 3221 and a second wall portion 3222 arranged sequentially along the thickness direction

By arranging the protrusion 32 to protrude from the first surface 311 of the base plate 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 encloses a cavity 323, so that when the current collecting member 30 is used in the electrochemical device 100, the substrate 31 is connected to the tab 21 of the electrode assembly 20, and the bottom wall 321 of the convex portion 32 is connected to the housing assembly 10 That is, the electrical connection between the electrode assembly 20 and the housing assembly 10 can be realized, so as to reduce the difficulty of connection between the current collecting member 30 and the housing assembly 10 . In addition, by arranging the side wall 322 of the convex portion 32 as the first wall portion 3221 and the second wall portion 3222 arranged along the thickness direction The structure is configured as a folded corner 3223, that is to say, a bent structure is formed on the side wall 322. The current collecting member 30 using this structure can be pressed when the current collecting member 30 is connected to the housing assembly 10. The bending moment exerted by the base plate 31 on the bottom wall 321 is transferred to the corner 3223 formed between the first wall 3221 and the second wall 3222, thereby reducing the bending moment experienced by the bottom wall 321, thus effectively reducing the occurrence of the bending moment of the bottom wall 321. The degree of convex deformation reduces the phenomenon of unreliable connection between the bottom wall 321 of the current collecting member 30 and the housing component 10, improves the connection stability between the bottom wall 321 and the housing component 10, and thereby improves the ability to have this type of current collection. Reliability and service life of electrochemical device 100 of component 30 .

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 tab 21 of the electrode assembly 20 to realize the connection between the electrode assembly 20 and the current collecting member 30 . electrical connection between them, and is conducive to increasing the connection area between the current collecting member 30 and the tab 21, and reducing contact resistance and local overcurrent. The bottom wall 321 of the convex portion 32 is used to connect with the housing 11 or the end cover 12 of the housing assembly 10 to achieve electrical connection between the current collection member 30 and the housing assembly 10 . When the current collecting member 30 is connected to the housing 11 or the end cover 12 of the housing assembly 10, the pressure that needs to be applied to the current collecting member 30 acts on the base plate 31, so that the pressure can be transmitted to the bottom wall 321 through the side wall 322, The bottom wall 321 is tightly fitted to the housing 11 or the end cover 12 of the housing assembly 10 to ensure the connection quality between the bottom wall 321 and the housing 11 or the end cover 12 of the housing assembly 10 .

The convex portion 32 is a structure enclosed 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 The wall 321 encloses a cavity 323 . It should be noted that in FIG. 5 , the cavity 323 enclosed 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 convex portion 32 are in the cavity. The position of 323 is enclosed to form a groove.

Alternatively, the current collecting member 30 may be an integral structure or a split structure. When the current collecting member 30 is an integrally formed structure, the current collecting member 30 may be manufactured using a stamping process or a casting process to form the protruding portion 32 on the first surface 311 of the base plate 31 and make the side walls 322 of the protruding portion 32 It is enclosed with the bottom wall 321 to form a cavity 323. For example, in this embodiment, the current collecting member 30 is made by a stamping process. The plate is punched along the thickness direction of the plate to punch protrusions on the plate. A convex structure is formed on one side of the plate, and a groove structure is formed on the other side of the convex structure. After the stamping is completed, the part where the convex structure is punched out is the convex part 32, and the part which is not punched is the convex part 32. Substrate 31. When the current collecting member 30 has a split structure, the protruding portion 32 can be connected to the first surface 311 of the base plate 31 through a welding process, and a through hole is opened in the protruding portion 32 corresponding to the position of the base plate 31 so that the cavity of the protruding portion 32 323 penetrates from the first surface 311 of the substrate 31 to the second surface 312 of the substrate 31 along the thickness direction X of the substrate.

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 to say, the side wall 322 is composed of at least two wall portions arranged along the thickness direction X of the substrate. At least two wall portions together form side wall 322. For example, in FIGS. 4 and 5 , 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 Connected to the bottom wall 321 , the second wall portion 3222 is connected to the base plate 31 . Of course, in some embodiments, the side wall 322 may include three, four or five equal wall portions sequentially arranged and connected along the thickness direction X of the substrate.

The first wall part 3221 and the second wall part 3222 are connected to each other and form a bend 3223 at the connection position. That is to say, the connection position between the first wall part 3221 and the second wall part 3222 forms a bending structure, that is, the first wall part 3221 and the second wall portion 3222 are non-parallel structures to form an included angle between the first wall portion 3221 and the second wall portion 3222.

For example, as shown in FIGS. 4 and 5 , the folded corner 3223 points toward the cavity 323 , that is, the folded corner 3223 formed at the connection position of the first wall portion 3221 and the second wall portion 3222 is bent toward the cavity 323 .

By arranging the angle 3223 formed at the connection position of the first wall part 3221 and the second wall part 3222 to point towards the cavity 323, the current collecting member 30 adopting this structure can further improve the reduction of the bending moment suffered by the bottom wall 321, thereby It is beneficial to further reduce the degree of convex deformation of the bottom wall 321 during the process of connecting with the housing assembly 10 .

According to some embodiments of the present application, please continue to refer to FIGS. 4 and 5 . One end of the first wall 3221 away from the second wall 3222 is connected to the bottom wall 321 , and the end of the second wall 3222 away from the first wall 3221 One end is connected to the base plate 31 . The angle between the first wall 3221 and the bottom wall 321 is a, the angle of the side of the folded corner 3223 facing the cavity 323 is γ, b=γ-(180°-a), and a<b is satisfied.

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 base plate 31, that is, the side wall 322 only includes the thickness direction along the base plate. The two wall parts arranged in Only a folded corner 3223 is formed on the structure.

It should be noted that the angle formed between the first wall 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 first wall 3221 faces the cavity 323 The angle formed between the surface of and the bottom wall 321 is a. Similarly, the angle of the side of the folding 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 folding corner 3223 facing the cavity 323 is γ.

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

a<b, that is to say, the angle 3223 formed between the first wall part 3221 and the second wall part 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 On the top, the side wall 322 forms a bell mouth shape that is gradually turned toward the side away from the cavity 323 .

The first wall portion 3221 and the second wall portion 3222 of the side wall 322 are connected to the bottom wall 321 and the base plate 31 respectively. That is to say, only one corner 3223 is formed on the side wall 322, so as to improve the force bearing of the bottom wall 321. At the same time, it can also reduce the difficulty of processing and manufacturing, 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 that of the first wall portion 3221 The angle formed between the surface facing the cavity 323 and the bottom wall 321 is such that the angle 3223 formed at the connection position of the first wall 3221 and the second wall 3222 is a structure that is bent into the cavity 323. With this structure The force of the base plate 31 can be better transferred to the folding corner 3223 and the bending moment on the bottom wall 321 can be reduced, thereby reducing the degree of convex deformation of the bottom wall 321 during the process of connecting with the housing assembly 10 .

According to some embodiments of the present application, as shown in Figure 5, 10°≤b-a≤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 first wall portion 3221 facing the cavity. The angle formed by the surface of the cavity 323 and the bottom wall 321 is between 10° and 80°.

Referring to the table below, the difference between the angle b formed by the surface of the second wall 3222 facing the cavity 323 and the bottom wall 321 and the angle a formed by the surface of the first wall 3221 facing the cavity 323 and the bottom wall 321 are used. Experiments were conducted on 7 groups of experimental subjects with different values. The base plate 31 and the bottom wall 321 are both perpendicular to the thickness direction X of the base plate, so that the base plate 31 and the bottom wall 321 are parallel to each other. The distance between the base plate 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 base plate is L ₁ , and L ₁ =1.5 mm. The distance between the connection position of the first wall part 3221 and the second wall part 3222 and the bottom wall 321 is L ₂ , that is, the length of the first wall part 3221 in the thickness direction X of the substrate is L ₂ , L ₂ /L ₁ =0.5. The pressure value applied to the current collecting member 30 is 13N (that is, the pressure value applied to the substrate 31 is 13N). In order to facilitate processing, a is set to 90°, and the difference between a and b is adjusted by changing the size of b. Experiment The result is as follows:

Table 1

In the actual manufacturing process, the protruding height of the bottom wall 321 is less than 8 μm, which is a qualified state, which can ensure the welding quality between the bottom wall 321 and the electrical lead-out part of the housing assembly 10. When the protruding height of the bottom wall 321 exceeds 8 μm, When this occurs, it may cause a weak or unreliable welding between the bottom wall 321 and the electrical lead-out portion of the housing assembly 10 . It can be seen from the above usage data that through the setting of the folding angle 3223, the protruding height of the bottom wall 321 is less than 8 μm, which can meet the manufacturing requirements. Furthermore, 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 to 20° to The effect is better at 70°.

By setting the difference between the angle formed by the surface of the second wall part 3222 facing the cavity 323 and the bottom wall 321 and the angle formed by the surface of the first wall part 3221 facing the cavity 323 and the bottom wall 321 at 20° to 70° °, so that the folded angle 3223 formed between the first wall portion 3221 and the second wall portion 3222 can better share the bending moment transmitted from the base plate 31 to the bottom wall 321, thereby further reducing the friction between the bottom wall 321 and the housing assembly 10 The degree of convex deformation that occurs during the connection process improves the connection reliability between the bottom wall 321 and the housing assembly 10 .

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

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 (that is, 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 experiments were conducted on 7 groups of experimental subjects with different angles a formed by the surface of the first wall 3221 facing the cavity 323 and the bottom wall 321. The experimental results are as follows:

Table 2

It can be seen from the above usage data that by setting the angle formed by the surface of the first wall 3221 facing the cavity 323 and the bottom wall 321 at 90° to 135°, on the one hand, the problem caused by the first wall 3221 facing the cavity can be alleviated. The angle formed by the surface of the cavity 323 and the bottom wall 321 is less than 90°, which makes the first wall 3221 inconvenient to process. This helps to reduce the difficulty of processing the first wall 3221. On the other hand, it can reduce the difficulty of processing the first wall 3221. The angle formed by the surface of the portion 3221 facing the cavity 323 and the bottom wall 321 is too large, resulting in poor improvement in the stress of the bottom wall 321 .

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

By setting the included angle between the surface of the second wall 3222 facing the cavity 323 and the bottom wall 321 to be between 110° and 160°, on the one hand, it is possible to alleviate the formation of an angle between the surface of the second wall 3222 facing the cavity 323 and the bottom wall 321 . If the included angle is too small, the degree of bending between the second wall 3222 and the base plate 31 will be too large, making processing more difficult. On the other hand, it can reduce the problem of the surface and bottom of the second wall 3222 facing the cavity 323 being reduced. The included angle formed by the wall 321 is too large, causing the second wall portion 3222 and the base plate 31 to become parallel, causing the angle 3223 formed between the first wall portion 3221 and the second wall portion 3222 to share the transfer of the base plate 31 to the bottom wall 321 The bending moment effect is not good.

According to some embodiments of the present application, as shown in FIG. 5 , the distance between the substrate 31 and the bottom wall 321 is L ₁ along the thickness direction The distance between the bottom walls 321 is L ₂ , which satisfies 0.1≤L ₂ /L ₁ ≤0.9.

Referring to 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). The connection position of the first wall portion 3221 and the second wall portion 3222 and the bottom wall 321 are used. Experiments were conducted on 9 groups of experimental subjects with different ratios of the distance between the substrate 31 and the bottom wall 321 , where L ₁ =1.5mm. The experimental results are as follows:

table 3

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

By setting the distance between the connection position of the first wall part 3221 and the second wall part 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, so that the first wall part The folded corner 3223 formed between 3221 and the second wall portion 3222 is located at a position close to the middle of the side wall in the thickness direction The folded angle 3223 formed between the second wall portion 3222 can better share the bending moment transmitted from the base plate 31 to the bottom wall 321, thereby better reducing the occurrence of bulges in the bottom wall 321 during the connection process with the housing assembly 10. degree of deformation.

In some embodiments, as shown in FIG. 5 , 0.2mm≤L ₁ ≤5mm, that is, the distance between the base plate 31 and the bottom wall 321 is 0.2mm to 5mm. By setting the distance between the base plate 31 and the bottom wall 321 to 0.2 mm to 5 mm, on the one hand, the problem of difficulty in processing due to the too small distance can be improved, and on the other hand, the problem of the current collecting member caused by the excessive distance can be alleviated. The space occupied by the current collecting member 30 is too large, so as to improve the energy density of the electrochemical device 100 having such a current collecting member 30 .

In some embodiments, as shown in FIG. 5 , 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 part 3221 and the second wall part 3222 and the bottom wall 321 to 0.04 mm to 2 mm, on the one hand, the problem of difficulty in processing due to too small distance can be improved, and on the other hand, the problem of difficulty in processing due to too small distance can be improved. In this aspect, it can alleviate the phenomenon that the overall space occupied by the current collecting member 30 is too large due to excessive distance.

According to some embodiments of the present application, as shown in FIG. 5 , the base plate 31 and the bottom wall 321 are parallel to each other.

The base plate 31 and the bottom wall 321 are parallel to each other, that is, the base plate 31 and the bottom wall 321 are spaced apart along the thickness direction X of the base plate, and both the base plate 31 and the bottom wall 321 are perpendicular to the thickness direction X of the base plate.

By arranging the base plate 31 and the bottom wall 321 of the current collecting member 30 to be parallel to each other, the current collecting member 30 with this structure is convenient for processing and manufacturing and is conducive to mass production. On the other hand, the current collecting member 30 is used in electrical applications. When the chemical device 100 is installed, the base plate 31 can be easily connected to the tabs 21 of the electrode assembly 20 , and the bottom wall 321 can be easily connected to the housing assembly 10 .

According to some embodiments of the present application, as shown in FIGS. 2 and 3 , embodiments of the present application also provide an electrochemical device 100 , including a housing assembly 10 , an electrode assembly 20 , and a current collecting member 30 of any of the above solutions. 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 convex portion 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 .

For example, in FIG. 3 , the second surface 312 of the substrate 31 is connected to the tab 21 .

It should be noted that the relevant structure of the housing assembly 10 may refer to the housing assembly 10 provided in the previous embodiments, and will not be described again here.

The electrochemical device 100 is provided with the current collecting member 30 of any of the above solutions, by connecting the base plate 31 of the current collecting member 30 to the tab 21 , and connecting the bottom wall 321 of the convex portion 32 of the current collecting member 30 with the housing assembly 10 The electrical connection between the electrode assembly 20 and the housing assembly 10 can be achieved by connecting the electrical lead-out portions, so as to reduce the difficulty of connection between the current collecting member 30 and the housing assembly 10 . In addition, the current collecting member 30 with this structure can transfer the bending moment of the base plate 31 acting on the bottom wall 321 to the first The corner 3223 formed between the wall portion 3221 and the second wall portion 3222 is used to improve the force bearing condition of the bottom wall 321, thereby effectively reducing the degree of convex deformation of the bottom wall 321, thereby effectively reducing the stress of the current collecting member 30. The risk of unreliable connection between the bottom wall 321 and the electrical lead-out part increases the stability of the connection 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 .

In some embodiments, the electrode assembly 20 has a rolled structure. 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 tab region. The active layer Disposed on the surface of the first area, the tab area is located at the end of the first pole piece in the width direction. The tab area is at least partially bent to form a first end surface of the wound structure, and the first end surface is connected to the substrate 31 .

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 member 30, it is beneficial to increase the connection area between the tab 21 and the substrate 31, and improve conductivity, thereby improving the power performance of the electrochemical device 100.

In some embodiments, the first pole piece is a negative pole piece.

According to some embodiments of the present application, please continue to refer to Figures 2 and 3. The housing assembly 10 includes a housing 11 and an end cover 12. One end of the housing 11 forms an opening 111, and the end cover 12 covers the opening 111. The electrical The lead-out part is a housing 11, and the electrode assembly 20 is accommodated in the housing 11.

The electrical extraction part is the housing 11 , that is, the bottom wall 321 of the protruding part 32 is connected to the housing 11 .

For example, in FIG. 3 , the bottom wall 321 of the convex portion 32 is connected to the end wall 113 of the housing 11 that is opposite to the opening 111 . Using this structure, the housing 11 and the current collecting member of the housing assembly 10 can be connected first. After the assembly of 30 and the electrode assembly 20 is completed, the end cover 12 is then closed at the opening 111 of the housing 11 , thereby reducing the assembly difficulty of the electrochemical device 100 .

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 convex portion 32 is connected to the end cover 12 .

According to some embodiments of the present application, embodiments of the present application also provide an electrical device, including the electrochemical device 100 of any of the above solutions, and the electrochemical device 100 is used to provide electrical energy to the electrical device.

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

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other.

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 changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Claims

A current collecting component including:

A substrate having a first surface and a second surface arranged oppositely along its thickness direction; and

A convex portion protrudes from the first surface, the convex portion includes a bottom wall and a side wall, the side wall connects the base plate and the bottom wall, and the side wall and the bottom wall enclose a cavity. ;

Wherein, the side wall includes a first wall part and a second wall part arranged sequentially along the thickness direction of the substrate, and the first wall part and the second wall part are connected and form a bend at the connection position.
The current collecting component according to claim 1, wherein at least one of the following conditions is met:

(1) The folded corner points to the cavity;

(2) The base plate and the bottom wall are parallel to each other.
The current collecting member according to claim 1 or 2, wherein an end of the first wall portion away from the second wall portion is connected to the bottom wall, and the second wall portion is away from the first wall portion. One end is connected to the substrate;

The angle between the first wall and the bottom wall is a, the angle of the side facing the cavity is γ, b=γ-(180°-a), satisfying, a <b.
The current collecting component according to claim 3, wherein at least one of the following conditions is met:

(1)10°≤b-a≤80°;

(2)90°≤a≤135°;

(3)100°≤b≤170°.
The current collecting component according to claim 4, wherein at least one of the following conditions is met:

(1)20°≤b-a≤70°;

(2)110°≤b≤160°.
The current collecting member according to claim 3, wherein a distance between the substrate and the bottom wall is L 1 along a thickness direction of the substrate, and the first wall portion and the second wall portion The distance between the connection position and the bottom wall is L 2 , and at least one of the following conditions is met:

(1)0.1≤L 2 /L 1 ≤0.9;

(2)0.2mm≤L 1 ≤5mm;

(3)0.04mm≤L 2 ≤2mm.
The current collecting member according to claim 6, wherein 0.2≤L2 / L1≤0.8 .
An electrochemical device comprising:

Housing assembly, including electrical lead-out;

an electrode assembly housed in the housing assembly, the electrode assembly having tabs; and

The current collecting member according to any one of claims 1 to 7, wherein the bottom wall is connected to the electrical lead-out part, and the substrate is connected to the tab.
The electrochemical device according to claim 8, wherein at least one of the following conditions is met:

(1) The electrode assembly has 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 tab region. , the active layer is provided on the surface of the first area, the tab area is located at the end of the width direction of the first pole piece, and the tab area is at least partially bent to form the wound type a first end face of the structure, the first end face being connected to the substrate;

(2) The housing assembly includes a housing and an end cover. One end of the housing forms an opening. The end cover covers the opening. The electrical lead-out part is the housing. The electrode assembly accommodates inside the housing.
An electrical device comprising the electrochemical device according to claim 8 or 9.