Battery cell, battery apparatus, electrical apparatus, and energy storage apparatus

Abstract

Embodiments of the present application provide a battery cell, a battery apparatus, an electrical apparatus, and an energy storage apparatus. The battery cell comprises a housing, a first electrode lead-out component, a first electrode assembly, and a second electrode assembly. The housing comprises a first wall. The first electrode lead-out component is disposed on the first wall. The first electrode assembly comprises a first main body portion and a first tab, and the first tab is disposed at an end of the first main body portion adjacent to the first wall. The second electrode assembly comprises a second main body portion and a second tab, and the second tab is disposed at an end of the second main body portion adjacent to the first wall. The first main body portion and the second main body portion are stacked in a first direction. On a projection plane perpendicular to a thickness direction of the first wall, an orthographic projection of the first tab and an orthographic projection of the second tab at least partially overlap, and the first tab and the second tab are connected to the first electrode lead-out component by means of a first welding mark. The technical solution provided in the present application can improve the assembly efficiency of battery cells.

Description

Battery cells, battery packs, electrical devices and energy storage devices

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application CN202520006001.0, filed on January 2, 2025, entitled “Battery cell, battery device, power consumption device and energy storage device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery device technology, and more specifically, to a battery cell, a battery device, an electrical device, and an energy storage device. Background Technology

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0005] In the manufacturing process of battery devices, assembly efficiency is a crucial factor. Therefore, improving assembly efficiency is a pressing technical challenge in battery device technology. Summary of the Invention

[0006] This application provides a battery cell, a battery device, an electrical device, and an energy storage device, which can improve the assembly efficiency of the battery cell.

[0007] This application is achieved through the following technical solution:

[0008] In a first aspect, embodiments of this application provide a battery cell, which includes a casing, a first electrode lead-out component, a first electrode assembly, and a second electrode assembly. The casing includes a first wall; the first electrode lead-out component is disposed on the first wall; the first electrode assembly is disposed within the casing, and the first electrode assembly includes a first main body and a first tab, the first tab being disposed at one end of the first main body near the first wall; the second electrode assembly is disposed within the casing, and the second electrode assembly includes a second main body and a second tab, the second tab being disposed at one end of the second main body near the first wall, the first main body and the second main body being stacked along a first direction, the first tab and the second tab having the same polarity, the first direction being perpendicular to the thickness direction of the first wall; wherein, on a projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first tab and the orthographic projection of the second tab at least partially overlap, and the first tab and the second tab are connected to the first electrode lead-out component by a first solder mark.

[0009] According to the embodiments of this application, in a battery cell, a first main body and a second main body are stacked along a first direction to improve the space utilization rate inside the battery cell in the first direction; a first tab and a second tab are stacked along the thickness direction of the first wall, and the first tab and the second tab are welded to the first electrode lead-out component by a first solder mark, which not only makes the connection between the first tab and the second tab and the first electrode lead-out component reliable, but also simplifies the assembly process and facilitates the improvement of the assembly efficiency of the first tab and the second tab and the first electrode lead-out component, thereby improving the assembly efficiency of the battery cell.

[0010] According to some embodiments of this application, the first electrode tab has a first root, a first bend, and a first connecting portion, the first root being connected to the first main body, and the first bend connecting the first connecting portion and the first root; the second electrode tab has a second root, a second bend, and a second connecting portion, the second root being connected to the second main body, and the second bend connecting the second connecting portion and the second root; on a projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first connecting portion and the orthographic projection of the second connecting portion at least partially overlap, and the first connecting portion and the second connecting portion are connected to the first electrode lead-out component through a first solder mark.

[0011] In the above scheme, the first root is connected to the first main body, the first connecting part is bent relative to the first root through the first bending part, the second root is connected to the second main body, and the second connecting part is bent relative to the second root through the second bending part, so that the first connecting part and the second connecting part are at least partially stacked along the thickness direction of the first wall, so that the first connecting part and the second connecting part can be connected to the first electrode lead-out component through the first solder mark, which facilitates the improvement of assembly efficiency.

[0012] According to some embodiments of this application, the first bend and the second bend are spaced apart along a first direction.

[0013] In the above scheme, a gap is formed between the first bending part and the second bending part, so that a large heat dissipation space is formed between the first electrode and the second electrode, which is conducive to improving the life of the battery cell.

[0014] According to some embodiments of this application, the first electrode lead-out component includes a first electrode terminal, and a first electrode tab and a second electrode tab are connected to the first electrode terminal via a first solder mark.

[0015] In the above scheme, the first tab and the second tab are connected to the first electrode terminal through the first solder mark, which can reduce the number of components inside the battery cell and help reduce manufacturing costs.

[0016] According to some embodiments of this application, along the second direction, the size of the first electrode tab is W1, the size of the second electrode tab is W2, and the size of the battery cell is L, satisfying that 0.1≤W1 / L<0.5, 0.1≤W2 / L<0.5, and the second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other.

[0017] By setting the ratio of the dimension of the first tab along the second direction to the dimension of the battery cell along the second direction to be greater than or equal to 0.1 and less than 0.5, and by setting the ratio of the dimension of the second tab along the second direction to the dimension of the battery cell along the second direction to be greater than or equal to 0.1 and less than 0.5, both the first tab and the second tab and the first electrode lead-out component have a large current flow area, the first tab and the second tab have a large heat dissipation area, and the risk of interference between the first tab and the second tab and other components can be reduced.

[0018] According to some embodiments of this application, 0.2≤W1 / L≤0.4, 0.2≤W2 / L≤0.4.

[0019] When W1 / L≥0.2 and W2 / L≥0.2, the first and second electrodes have a larger flow area with respect to the first electrode lead-out component, and the first and second electrodes have a larger heat dissipation area. When W1 / L≤0.4 and W2 / L≤0.4, the risk of interference between the first and second electrodes and other components is further reduced.

[0020] According to some embodiments of this application, the outer casing further includes a second wall and a third wall disposed opposite to each other along a second direction. Along the second direction, the distance between the first electrode tab and the second wall is less than the distance between the first electrode tab and the third wall. The second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other. Along the second direction, the distance between the first electrode tab and the second wall is K1, and the distance between the second electrode tab and the second wall is K2, satisfying that 7mm≤K1≤50mm and 7mm≤K2≤50mm.

[0021] By setting the distance between the first electrode tab and the second wall along the second direction to be greater than or equal to 7 mm and less than or equal to 50 mm, the size of the first electrode tab along the second direction can be designed to be larger, resulting in a larger heat dissipation area and a larger flow area between the first electrode tab and the first electrode lead-out component, while also reducing the risk of interference between the first electrode tab and other components. Similarly, by setting the distance between the first electrode tab and the second wall along the second direction to be greater than or equal to 7 mm and less than or equal to 50 mm, the size of the second electrode tab along the second direction can be designed to be larger, resulting in a larger heat dissipation area and a larger flow area between the second electrode tab and the first electrode lead-out component, while also reducing the risk of interference between the second electrode tab and other components.

[0022] According to some embodiments of this application, 12mm≤K1≤25mm, 12mm≤K2≤25mm.

[0023] In the above scheme, when 12mm≤K1≤25mm, on the one hand, the size of the first electrode tab along the second direction can be designed to be larger, the first electrode tab has a larger heat dissipation area, and there is a larger flow area between the first electrode tab and the first electrode lead-out component. On the other hand, the risk of interference between the first electrode tab and other components can be further reduced. When 12mm≤K2≤25mm, on the one hand, the size of the second electrode tab along the second direction can be designed to be larger, the second electrode tab has a larger heat dissipation area, and there is a larger flow area between the second electrode tab and the first electrode lead-out component. On the other hand, the risk of interference between the second electrode tab and other components can be further reduced.

[0024] According to some embodiments of this application, the first electrode lead-out component includes a first electrode terminal and a first adapter. The first electrode terminal is disposed on a first wall, and the first electrode tab and the second electrode tab are connected to the first adapter through a first solder mark. The first adapter is connected to the first electrode terminal.

[0025] In the above scheme, the first tab and the second tab are connected to the first adapter through the first solder mark. The first adapter is connected to the first electrode terminal, which can provide a low-resistance current conduction path, facilitate efficient power transmission, and help dissipate heat from the first tab, the second tab and the first electrode lead-out component, and facilitate the charge and discharge cycle of the battery cell.

[0026] According to some embodiments of this application, the battery cell further includes a second electrode lead-out component disposed on the first wall; the first electrode assembly also has a third electrode tab with a polarity opposite to that of the first electrode tab, the third electrode tab being disposed at one end of the first main body near the first wall; the second electrode assembly also has a fourth electrode tab with a polarity opposite to that of the second electrode tab, the fourth electrode tab being disposed at one end of the second main body near the first wall; wherein, on a projection plane perpendicular to the thickness direction of the first wall, the orthographic projections of the third electrode tab and the fourth electrode tab at least partially overlap, and the third electrode tab and the fourth electrode tab are connected to the second electrode lead-out component by a second solder mark.

[0027] In the above scheme, the third tab and the fourth tab are connected to the second electrode lead-out component through the second solder mark, which not only makes the connection between the third tab and the fourth tab and the second electrode lead-out component reliable, but also simplifies the assembly process, facilitates the improvement of the assembly efficiency of the third tab and the fourth tab and the second electrode lead-out component, and facilitates the improvement of the assembly efficiency of the battery cell.

[0028] According to some embodiments of this application, the third electrode tab has a third root, a third bend, and a third connecting portion. The third root is connected to the first main body, and the third bend connects the third connecting portion and the third root. The fourth electrode tab has a fourth root, a fourth bend, and a fourth connecting portion. The fourth root is connected to the second main body, and the fourth bend connects the fourth connecting portion and the fourth root. On a projection plane perpendicular to the thickness direction of the first wall, the orthographic projections of the third connecting portion and the fourth connecting portion at least partially overlap. The third connecting portion and the fourth connecting portion are connected to the second electrode lead-out component via a second solder mark.

[0029] In the above scheme, the third root is connected to the first main body, the third connecting part is bent relative to the third root through the third bending part, the fourth root is connected to the second main body, and the fourth connecting part is bent relative to the fourth root through the fourth bending part, so that the third connecting part and the fourth connecting part are at least partially stacked along the thickness direction of the first wall, so that the third connecting part and the fourth connecting part can be connected to the second electrode lead-out component through the second solder mark, which facilitates the improvement of assembly efficiency.

[0030] According to some embodiments of this application, the third bend and the fourth bend are spaced apart along the first direction.

[0031] In the above scheme, a gap is formed between the third bend and the fourth bend, which creates a larger heat dissipation space between the third tab and the fourth tab, thus facilitating the improvement of the battery cell life.

[0032] According to some embodiments of this application, the second electrode lead-out component includes a second electrode terminal and a second adapter. The second electrode terminal is disposed on the first wall, and the third electrode tab and the fourth electrode tab are connected to the second adapter through a second solder mark. The second adapter is connected to the second electrode terminal.

[0033] In the above scheme, the third tab and the fourth tab are connected to the second adapter through the second solder mark, and the second adapter is connected to the second electrode terminal. This can provide a low-resistance current conduction path, which facilitates efficient power transmission, helps heat dissipation of the third tab, the fourth tab and the second electrode lead-out component, facilitates the charge and discharge cycle of the battery cell, and helps to improve the life of the battery cell.

[0034] According to some embodiments of this application, the surface of the battery cell perpendicular to the first direction is the surface with the largest area of ​​the battery cell.

[0035] In the above scheme, the first direction is perpendicular to the large surface of the battery cell, and the first direction can be parallel to the thickness direction of the battery cell. Since the first tab and the second tab are stacked, the thickness of the battery cell can be designed to be relatively thin.

[0036] According to some embodiments of this application, along the first direction, the size of the battery cell is less than or equal to 35 mm.

[0037] By setting the size of the battery cell along the first direction to be less than or equal to 35mm, the size of the battery cell along the first direction is small. By stacking the first tab and the second tab, the space occupied by the first tab and the second tab in the first direction can be reduced, which is beneficial to the connection between the first tab and the second tab and the first electrode lead-out component. Furthermore, the first tab and the second tab are connected to the first electrode lead-out component through a first solder mark. The first solder mark can have a large area, which is conducive to improving the current carrying capacity between the first tab and the second tab and the first electrode lead-out component. At the same time, the battery device composed of this battery cell can have more battery cells arranged along the first direction, which is conducive to improving the energy density of the battery device.

[0038] According to some embodiments of this application, along the first direction, the size of the battery cell is less than or equal to 32 mm.

[0039] By setting the size of the battery cell along the first direction to be less than or equal to 32mm, it is further beneficial that the battery device composed of the battery cell can have more battery cells arranged along the first direction, which facilitates the improvement of the energy density of the battery device.

[0040] According to some embodiments of this application, the battery cell further includes a first insulating member disposed on the side of the first wall facing the interior of the battery cell, and the first insulating member is used to separate the first wall from the first electrode assembly and the second electrode assembly.

[0041] In the above scheme, by providing a first insulating element on the side of the first wall facing the inside of the battery cell, the first wall and the first electrode assembly and the second electrode assembly can be separated, thereby reducing the risk of short circuit between the positive and negative electrodes.

[0042] According to some embodiments of this application, the housing includes a shell and an end cap, the shell having an opening, the end cap closing the opening, and the end cap being a first wall.

[0043] In the above scheme, the end cap is the first wall, and the first electrode lead-out component is disposed on the end cap, which facilitates the assembly of the first electrode tab and the second electrode tab with the first electrode lead-out component, and facilitates the assembly of the battery cell.

[0044] Secondly, embodiments of this application also provide a battery device, which includes a battery cell provided according to any of the above embodiments.

[0045] Thirdly, embodiments of this application also provide an electrical device, which includes a battery cell or battery device provided according to any of the above embodiments, wherein the battery cell or battery device is used to provide electrical energy.

[0046] Fourthly, embodiments of this application also provide an energy storage device, which includes a battery cell or battery device provided according to any of the above embodiments, wherein the battery cell or battery device is used to store electrical energy and is capable of providing electrical energy.

[0047] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0050] Figure 2 is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0051] Figure 3 is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0052] Figure 4 is a cross-sectional view of a partial structure of a battery cell provided in some embodiments of this application;

[0053] Figure 5 is an enlarged view of the layout at point A in Figure 4;

[0054] Figure 6 is a schematic diagram of the assembly state of the first electrode assembly and the second electrode assembly provided in some embodiments of this application;

[0055] Figure 7 is a schematic diagram of the assembly of the first electrode terminal and the first wall provided in some embodiments of this application;

[0056] Figure 8 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0057] Figure 9 is a schematic diagram of the assembly of the first electrode terminal and the first wall provided in some other embodiments of this application;

[0058] Figure 10 is a schematic diagram of the assembly state of the first electrode assembly and the second electrode assembly with the first adapter provided in some embodiments of this application;

[0059] Figure 11 is a schematic diagram of the assembly of the third and fourth electrodes and the second electrode lead-out component provided in some embodiments of this application.

[0060] Icons: 100 - Battery assembly; 10 - Housing; 11 - First sub-housing; 12 - Second sub-housing; 20 - Battery cell; 21 - Housing; 211 - Shell; 212 - End cap; 213 - First wall; 2131 - First electrode lead-out hole; 2132 - Second electrode lead-out hole; 214 - Second wall; 215 - Third wall; 216 - Fourth wall; 217 - Fifth wall; 22 - Electrode lead-out component; 22a - First electrode lead-out component; 221a - First electrode terminal; 222a - First adapter; 22b - Second electrode lead-out component; 221b - Second electrode terminal; 222b - Second adapter; 23 - Electrode assembly; 23a - First electrode assembly; 231a - First main body; 232a - First tab; 2321a - First end; 2322a - Second end; 233a - First root portion; 234a - First bend portion; 235a - First connecting portion; 236a - Third electrode tab; 237a - Third root portion; 238a - Third bend portion; 239a - Third connecting portion; 23b - Second electrode assembly; 231b - Second main body portion; 232b - Second electrode tab; 233b - Second root portion; 234b - Second bend portion; 235b - Second connecting portion; 236b - Fourth electrode tab; 237b - Fourth root portion; 238b - Fourth bend portion; 239b - Fourth connecting portion; 241 - First solder mark; 242 - Second solder mark; 243 - Third solder mark; 244 - Fourth solder mark; 25 - First insulating component; 200 - Controller; 300 - Motor; 1000 - Vehicle; X - First direction; Y - Second direction; Z - Thickness direction of the first wall. Embodiments of the present invention

[0061] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0063] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0064] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0065] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0066] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0067] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0068] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0069] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0070] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0071] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0072] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0073] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0074] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0075] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0076] In some embodiments, the energy storage device includes an energy storage enclosure and a battery unit. At least one side of the enclosure has a door for energy storage, and the battery unit is housed within the energy storage enclosure. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0077] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0078] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0079] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0080] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0081] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0082] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0083] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0084] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0085] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc.

[0086] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0087] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0088] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0089] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0090] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0091] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0092] In some implementations, the electrode assembly is a stacked structure.

[0093] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), or composite metal (such as a copper-aluminum composite housing).

[0094] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0095] In some embodiments, at least one electrode lead-out component is provided on the housing, and the electrode lead-out component is electrically connected to the tab of the electrode assembly. The electrode lead-out component can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode lead-out component can be provided on an end cap or on the housing.

[0096] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0097] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0098] The development of battery device technology must take into account multiple design factors, such as performance parameters like energy density, discharge capacity, and charge / discharge rate. In addition, the assembly efficiency of the battery device also needs to be considered.

[0099] In some embodiments, if a battery cell includes multiple electrode assemblies, and the multiple electrode assemblies have multiple tabs of the same polarity, in order to facilitate the connection between the tabs of the multiple electrode assemblies and the electrode lead-out components, the tabs of the same polarity of the multiple electrode assemblies are usually divided into two tabs. These two tabs are respectively connected to the electrode lead-out components by soldering. The two soldering marks are staggered in a first direction or a second direction, occupying a large assembly space. However, when the thickness of the battery cell is thin, the assembly space between the two tabs and the electrode lead-out components will be insufficient due to the thickness limitation of the battery cell, which will affect the assembly of the battery cell.

[0100] In view of this, in order to solve the problem of low assembly efficiency of battery cells caused by the assembly of tabs and electrode leads, this application provides a battery cell including a housing, a first electrode lead component, a first electrode assembly, and a second electrode assembly. The housing includes a first wall; the first electrode lead component is disposed on the first wall; the first electrode assembly is disposed inside the housing, and the first electrode assembly includes a first main body and a first tab, the first tab being disposed at the end of the first main body near the first wall; the second electrode assembly is disposed inside the housing, and the second electrode assembly includes a second main body and a second tab, the second tab being disposed at the end of the second main body near the first wall. The first main body and the second main body are stacked along a first direction, the first tab and the second tab have the same polarity, and the first direction is perpendicular to the thickness direction of the first wall; wherein, on a projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first tab and the orthographic projection of the second tab at least partially overlap, and the first tab and the second tab are connected to the first electrode lead component by a first solder mark. This battery cell has high assembly efficiency.

[0101] In such a battery cell, the first main body and the second main body are stacked along the first direction to improve the space utilization rate inside the battery cell in the first direction, and the battery cell can have a high energy density; the first tab and the second tab are stacked along the thickness direction of the first wall, and the first tab and the second tab are connected to the first electrode lead-out component by a first solder mark, which not only makes the connection between the first tab and the second tab and the first electrode lead-out component reliable, but also simplifies the assembly process and facilitates the improvement of the assembly efficiency of the first tab and the second tab and the first electrode lead-out component, so that the battery cell has a high assembly efficiency, and thus improves the assembly efficiency of the battery device composed of the battery cell.

[0102] The battery cells and battery devices disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery cells and battery devices disclosed in this application.

[0103] The technical solutions described in the embodiments of this application are applicable to various electrical devices or energy storage devices that use battery cells and battery devices.

[0104] Electrical devices can include mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, such as airplanes, rockets, space shuttles, and spacecraft.

[0105] Energy storage devices can include energy storage containers or energy storage cabinets. They can be used in energy storage power stations, wind power systems, solar power systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours.

[0106] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0107] Please refer to Figure 1, which is a schematic diagram of the vehicle structure provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0108] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0109] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0110] Please refer to Figure 2, which is an exploded view of the structure of a battery device provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10. The housing 10 provides space for the battery cells 20, and the housing 10 can adopt various structures.

[0111] In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other and together define a receiving space for accommodating the battery cell 20. The second sub-housing 12 may be a hollow structure with one end open, and the first sub-housing 11 may be a plate-like structure, with the first sub-housing 11 covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 together define the receiving space; alternatively, the first sub-housing 11 and the second sub-housing 12 may both be hollow structures with one side open, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0112] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form a battery cell assembly, and then these battery cell assemblies are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0113] Please refer to Figure 3, which is an exploded view of the structure of a battery cell provided in some embodiments of this application. As shown in Figure 3, the battery cell 20 includes a housing 21, an electrode lead-out component 22, an electrode assembly 23, and other functional components. The housing 21 includes a shell 211 and an end cap 212. The shell 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0114] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. The housing 211 can have various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 23. The housing 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0115] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved reliability. Functional components such as electrode lead-out components 22 and pressure relief mechanisms can be provided on end cap 212. Electrode lead-out components 22 can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 212. The insulating structure can be used to isolate the electrical connection components within the housing 211 from the end cap 212 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0116] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The housing 211 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body.

[0117] Please refer to Figure 3, and further refer to Figures 4 to 6. Figure 4 is a cross-sectional view of a partial structure of a battery cell provided in some embodiments of this application. Figure 5 is an enlarged view of the layout at point A in Figure 4. Figure 6 is a schematic diagram of the assembly state of the first electrode assembly and the second electrode assembly provided in some embodiments of this application. This application provides a battery cell 20, which includes a housing 21, a first electrode lead-out component 22a, a first electrode assembly 23a, and a second electrode assembly 23b. The housing 21 includes a first wall 213; the first electrode lead-out component 22a is disposed on the first wall 213; the first electrode assembly 23a is disposed within the housing 21, and the first electrode assembly 23a includes a first main body portion 231a and a first tab 232a, the first tab 232a being disposed at one end of the first main body portion 231a near the first wall 213; the second electrode assembly 23b is disposed within the housing 21, and the second electrode assembly 23b includes a second main body portion 231b and a second tab 232b, the second tab 232b being disposed at the second main body portion 231a near the first wall 213. At the end of 31b near the first wall 213, the first main body 231a and the second main body 231b are stacked along the first direction X. The first electrode tab 232a and the second electrode tab 232b have the same polarity. The first direction X is perpendicular to the thickness direction Z of the first wall. On the projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the first electrode tab 232a and the orthographic projection of the second electrode tab 232b overlap at least partially. The first electrode tab 232a and the second electrode tab 232b are connected to the first electrode lead-out component 22a through the first solder mark 241.

[0118] In the diagram, the direction indicated by the letter X is the first direction, which can be parallel to the thickness direction of the battery cell 20. The direction indicated by the letter Z is the thickness direction of the first wall.

[0119] The first wall 213 can be a wall portion of the housing 211, or the first wall 213 can also be an end cap 212.

[0120] In some embodiments, the first wall 213 may be provided with a first electrode lead-out hole 2131, which penetrates the first wall 213 along the thickness direction Z. A portion of the first electrode lead-out component 22a may be provided in the first electrode lead-out hole 2131 so that the first electrode lead-out component 22a is internally electrically connected to the first tab 232a and the second tab 232b, and externally electrically connected to a conductive component (such as a busbar component) outside the battery cell 20 so that electrical energy can be led out or introduced through the first electrode lead-out component 22a.

[0121] The first electrode assembly 23a and the second electrode assembly 23b can be electrode assemblies 23 of the same specifications to facilitate processing and manufacturing.

[0122] The first main body portion 231a has a first flat region, and the first direction X is the stacking direction of the electrode sheets in the first flat region. When the first electrode assembly 23a is a wound structure, the first main body portion 231a includes a first flat region and two first bent regions, the first flat region connecting the two first bent regions. The positive and negative electrode sheets located in the first flat region are flat structures, and the positive and negative electrode sheets located in the first bent regions are bent arc-shaped structures. When the first electrode assembly 23a is a stacked structure, the positive and negative electrode sheets located in the first flat region are stacked along the first direction X.

[0123] Correspondingly, the second main body 231b has a second flat region, and the first direction X is the stacking direction of the electrode sheets in the second flat region. When the second electrode assembly 23b is a wound structure, the second main body 231b includes a second flat region and two second bent regions, the second flat region connecting the two second bent regions. The positive and negative electrode sheets located in the second flat region are flat structures, and the positive and negative electrode sheets located in the second bent regions are bent arc-shaped structures. When the second electrode assembly 23b is a stacked structure, the positive and negative electrode sheets located in the second flat region are stacked along the first direction X.

[0124] In some embodiments, the first electrode 232a and the second electrode 232b can be either positive electrodes or negative electrodes.

[0125] The first electrode tab 232a may extend from the edge of the first main body portion 231a near the first wall 213, so as to connect the first electrode tab 232a to the first electrode lead-out member 22a. The second electrode tab 232b may extend from the edge of the second main body portion 231b near the first wall 213, so as to connect the second electrode tab 232b to the first electrode lead-out member 22a.

[0126] In some embodiments, the first electrode assembly 23a may include two or more first sub-electrode assemblies, and the tabs of the same polarity of the two first sub-electrode assemblies are brought together to form a first tab 232a; the second electrode assembly 23b may include two or more second sub-electrode assemblies, and the tabs of the same polarity of the two second sub-electrode assemblies are brought together to form a second tab 232b.

[0127] Referring to Figures 4 and 5, with the thickness direction Z of the first wall as the projection direction, the orthographic projection of the first electrode 232a and the orthographic projection of the second electrode 232b can partially or completely overlap, so that the first electrode 232a and the second electrode 232b have a large connection area, so as to facilitate the convergence of electrical energy of the first electrode assembly 23a and the second electrode assembly 23b.

[0128] Referring to Figure 6, when assembling the first electrode assembly 23a and the second electrode assembly 23b with the first electrode lead-out component 22a, the first main body 231a and the second main body 231b can be located on opposite sides of the first wall 213 along the first direction X. The first electrode tab 232a and the second electrode tab 232b are stacked along the thickness direction Z of the first wall, and the stacked first electrode tab 232a and the second electrode tab 232b are aligned with the first electrode lead-out component 22a. The first electrode tab 232a, the second electrode tab 232b and the first electrode lead-out component 22a are then welded so that the first electrode tab 232a and the second electrode tab 232b are connected to the first electrode lead-out component 22a through the first solder mark 241. After the first tab 232a and the second tab 232b are connected to the first electrode lead-out component 22a through the first solder mark 241, the first tab 232a, the second tab 232b and the first electrode lead-out component 22a are connected as one unit. The first tab 232a, the second tab 232b and the first electrode lead-out component 22a are firmly connected, and the current can flow between the first tab 232a and the second tab 232b and the first electrode lead-out component 22a, realizing the electrical connection between the first tab 232a and the second tab 232b and the first electrode lead-out component 22a.

[0129] Compared to the connection process of the first electrode tab 232a and the second electrode tab 232b to the first electrode lead-out component 22a respectively, the first electrode tab 232a and the second electrode tab 232b are stacked and then connected to the first electrode lead-out component 22a, which simplifies the assembly process and facilitates the improvement of the assembly efficiency of the first electrode assembly 23a and the second electrode assembly 23b to the first electrode lead-out component 22a.

[0130] According to the battery cell 20 of this application embodiment, the first main body portion 231a and the second main body portion 231b are stacked along the first direction X to improve the space utilization rate inside the battery cell 20 in the first direction X; the first tab 232a and the second tab 232b are stacked along the thickness direction Z of the first wall, and the first tab 232a and the second tab 232b are welded to the first electrode lead-out component 22a through the first solder mark 241, which not only makes the connection between the first tab 232a and the second tab 232b and the first electrode lead-out component 22a reliable, but also simplifies the assembly process and facilitates the improvement of the assembly efficiency of the first tab 232a and the second tab 232b and the first electrode lead-out component 22a, so that the battery cell 20 has a high assembly efficiency.

[0131] Referring to Figures 4 and 5, according to some embodiments of this application, the first electrode tab 232a has a first root portion 233a, a first bent portion 234a, and a first connecting portion 235a. The first root portion 233a is connected to the first main body portion 231a, and the first bent portion 234a connects the first connecting portion 235a and the first root portion 233a. The second electrode tab 232b has a second root portion 233b, a second bent portion 234b, and a second connecting portion 235b. The second root portion 233b is connected to the second main body portion 231b, and the second bent portion 234b connects the second connecting portion 235b and the second root portion 233b. On a projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the first connecting portion 235a and the orthographic projection of the second connecting portion 235b at least partially overlap. The first connecting portion 235a and the second connecting portion 235b are connected to the first electrode lead-out component 22a through a first solder mark 241.

[0132] The first root portion 233a is the part where the first electrode tab 232a is connected to the first main body portion 231a, and the first connecting portion 235a is the part where the first electrode tab 232a is connected to the first electrode lead-out component 22a; the first bending portion 234a connects the first connecting portion 235a and the first root portion 233a, so that the first electrode tab 232a can be a bent structure, and the first connecting portion 235a is bent relative to the first root portion 233a, so as to facilitate the connection of the first connecting portion 235a with the second electrode tab 232b and the first electrode lead-out component 22a.

[0133] The second root portion 233b is the part where the second tab 232b connects to the second main body portion 231b, and the second connecting portion 235b is the part of the second tab 232b used to connect to the first electrode lead-out component 22a; the second bending portion 234b connects the second connecting portion 235b and the second root portion 233b, so that the second tab 232b can be a bent structure, and the second connecting portion 235b is bent relative to the second root portion 233b, so as to facilitate the connection of the second connecting portion 235b with the first tab 232a and the first electrode lead-out component 22a.

[0134] In some embodiments, the first bend 234a and the second bend 234b are spaced apart along the first direction X.

[0135] In some embodiments, the first connecting portion 235a is bent from the first bending portion 234a toward the second bending portion 234b, and the second connecting portion 235b is bent from the second bending portion 234b toward the first bending portion 234a, so that the first connecting portion 235a and the second connecting portion 235b can be stacked in the thickness direction Z of the first wall; at the same time, a gap is formed between the first bending portion 234a and the second bending portion 234b, so that a large heat dissipation space is formed between the first tab 232a and the second tab 232b, which is conducive to improving the life of the battery cell 20. For example, along the first direction X, the first tab 232a is drawn in a direction away from the second main body 231b, and the drawn-in part of the first tab 232a can be located at the first bending part 234a. The second tab 232b is drawn in a direction away from the first main body 231a, and the drawn-in part of the second tab 232b can be located at the second bending part 234b, so that there is a large distance between the first bending part 234a and the second bending part 234b in the first direction X, which is conducive to heat dissipation of the first tab 232a and the second tab 232b.

[0136] In the above scheme, the first root portion 233a is connected to the first main body portion 231a, the first connecting portion 235a is bent relative to the first root portion 233a through the first bending portion 234a, the second root portion 233b is connected to the second main body portion 231b, and the second connecting portion 235b is bent relative to the second root portion 233b through the second bending portion 234b, so that the first connecting portion 235a and the second connecting portion 235b are at least partially stacked along the thickness direction Z of the first wall, so that the first connecting portion 235a and the second connecting portion 235b can be connected to the first electrode lead-out component 22a through the first solder mark 241, which facilitates the improvement of assembly efficiency.

[0137] Please refer to Figure 6 and further to Figure 7, which is a schematic diagram of the assembly of the first electrode terminal and the first wall according to some embodiments of this application. According to some embodiments of this application, the first electrode lead-out component 22a includes a first electrode terminal 221a, and a first electrode tab 232a and a second electrode tab 232b are connected to the first electrode terminal 221a through a first solder mark 241.

[0138] A portion of the first electrode terminal 221a may be disposed in the first electrode lead-out hole 2131 of the first wall 213. The first electrode terminal 221a may be insulated from the first wall 213, or the first electrode terminal 221a may be electrically connected to the first wall 213.

[0139] When assembling the first electrode tab 232a and the second electrode tab 232b with the first electrode terminal 221a, the first electrode tab 232a and the second electrode tab 232b are first stacked, then the stacked first electrode tab 232a and the second electrode tab 232b are placed on the first electrode terminal 221a, and then the first electrode tab 232a, the second electrode tab 232b and the first electrode terminal 221a are soldered so that the first electrode tab 232a and the second electrode tab 232b are connected to the first electrode terminal 221a through the first solder mark 241.

[0140] In some embodiments, the first electrode terminal 221a may be disposed along the second direction Y, and the first electrode terminal 221a may have a larger size in the second direction Y. For example, the first electrode terminal 221a may be cuboid, and the length direction of the first electrode terminal 221a may be parallel to the second direction Y.

[0141] In the above scheme, the first tab 232a and the second tab 232b are connected to the first electrode terminal 221a through the first solder mark 241, which can reduce the number of components inside the battery cell 20 and help reduce manufacturing costs.

[0142] Please refer to Figure 8, which is a cross-sectional view of a battery cell provided in some embodiments of this application. According to some embodiments of this application, along the second direction Y, the size of the first tab 232a is W1, the size of the second tab 232b is W2, and the size of the battery cell 20 is L, satisfying 0.1≤W1 / L<0.5, 0.1≤W2 / L<0.5, and the second direction Y, the first direction X, and the thickness direction Z of the first wall are all perpendicular to each other.

[0143] The dimension of the first electrode tab 232a along the second direction Y refers to the distance between the two opposite ends of the connection point between the first electrode tab 232a and the first main body portion 231a in the second direction Y. The dimension of the first electrode tab 232a along the second direction Y is measured by measuring the distance between the two opposite ends of the connection point between the first electrode tab 232a and the first main body portion 231a in the second direction Y using a micrometer.

[0144] The dimension of the second tab 232b along the second direction Y refers to the distance between the two opposite ends of the connection point between the second tab 232b and the second main body 231b in the second direction Y. The dimension of the second tab 232b along the second direction Y is measured by measuring the distance between the two opposite ends of the connection point between the second tab 232b and the second main body 231b in the second direction Y using a micrometer.

[0145] In some embodiments, the width direction of the first tab 232a may be parallel to the second direction Y. The width direction of the second tab 232b may be parallel to the second direction Y.

[0146] In some embodiments, W1 / L can be, but is not limited to, any one or any two of 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, or 0.45.

[0147] In some embodiments, W2 / L can be, but is not limited to, any one or any two of 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, or 0.45.

[0148] In some embodiments, the dimensions of the first tab 232a along the second direction Y are equal to the dimensions of the second tab 232b along the second direction Y. Here, "equal" means approximately equal and may have processing errors.

[0149] By setting the ratio of the dimension of the first tab 232a along the second direction Y to the dimension of the battery cell 20 along the second direction Y to be greater than or equal to 0.1 and less than 0.5, and by setting the ratio of the dimension of the second tab 232b along the second direction Y to the dimension of the battery cell 20 along the second direction Y to be greater than or equal to 0.1 and less than 0.5, the first tab 232a and the second tab 232b have a large flow area with the first electrode lead-out component 22a, and the first tab 232a and the second tab 232b have a large heat dissipation area. At the same time, the risk of interference between the first tab 232a and the second tab 232b and other components (such as the pressure relief mechanism and the liquid injection hole provided on the first wall) can be reduced.

[0150] According to some embodiments of this application, 0.2≤W1 / L≤0.4, 0.2≤W2 / L≤0.4.

[0151] When W1 / L≥0.2 and W2 / L≥0.2, the first tab 232a and the second tab 232b have a larger flow area with the first electrode lead-out component 22a, and the first tab 232a and the second tab 232b have a larger heat dissipation area; when W1 / L≤0.4 and W2 / L≤0.4, the risk of interference between the first tab 232a and the second tab 232b and other components is further reduced.

[0152] Referring to Figure 8, according to some embodiments of this application, the outer casing 21 further includes a second wall 214 and a third wall 215 disposed opposite to each other along the second direction Y. Along the second direction Y, the distance between the first tab 232a and the second wall 214 is less than the distance between the first tab 232a and the third wall 215. The second direction Y, the first direction X, and the thickness direction Z of the first wall are perpendicular to each other. Along the second direction Y, the distance between the first tab 232a and the second wall 214 is K1, and the distance between the second tab 232b and the second wall 214 is K2, satisfying that 7mm≤K1≤50mm and 7mm≤K2≤50mm.

[0153] The second wall 214 and the third wall 215 are two wall portions of the outer casing 21 arranged opposite each other along the second direction Y, and the first electrode assembly 23a and the second electrode assembly 23b are located between the second wall 214 and the third wall 215.

[0154] The connection between the first tab 232a and the first main body 231a has a first end 2321a and a second end 2322a disposed opposite each other along the second direction Y. The first end 2321a is closer to the second wall 214 than the second end 2322a. Along the second direction Y, the distance between the first end 2321a and the second wall 214 is less than the distance between the second end 2322a and the third wall 215. The distance between the first tab 232a and the second wall 214 along the second direction Y refers to the distance between the first end 2321a and the inner surface of the second wall 214 along the second direction Y. The method for measuring the distance between the first tab 232a and the second wall 214 along the second direction Y is as follows: the battery cell 20 is scanned by a CT scanning device, and the distance between the first end 2321a and the inner surface of the second wall 214 along the second direction Y is measured on the obtained image. This distance is the distance between the first tab 232a and the second wall 214 along the second direction Y.

[0155] For the method of measuring the distance between the second electrode 232b and the second wall 214 along the second direction Y, please refer to the method of measuring the distance between the first electrode 232a and the second wall 214 along the second direction Y described above.

[0156] If the distance between the first tab 232a and the second wall 214 along the second direction Y is too small, it may cause interference between the first tab 232a and other components inside the battery cell 20. For example, the first tab 232a may interfere with the insulation structure disposed on the first wall 213, or the first tab 232a may easily come into contact with the second wall 214, resulting in a short circuit between the positive and negative electrodes. If the distance between the first tab 232a and the second wall 214 along the second direction Y is too large, the size of the first tab 232a along the second direction Y will be smaller, the heat dissipation area of ​​the first tab 232a will be smaller, and the current flow area between the first tab 232a and the first electrode lead-out component 22a will be affected.

[0157] In some embodiments, the distance K1 between the first tab 232a and the second wall 214 along the second direction Y can be, but is not limited to, any one or any two of 7mm, 10mm, 12mm, 16mm, 20mm, 25mm, 28mm, 30mm, 35mm, 40mm, 45mm or 50mm.

[0158] If the distance between the second tab 232b and the second wall 214 along the second direction Y is too small, it may cause interference between the second tab 232b and other components inside the battery cell 20. For example, the second tab 232b may interfere with the insulation structure disposed on the first wall 213, or the second tab 232b may easily come into contact with the second wall 214, resulting in a short circuit between the positive and negative electrodes. If the distance between the second tab 232b and the second wall 214 along the second direction Y is too large, the size of the second tab 232b along the second direction Y will be smaller, the heat dissipation area of ​​the second tab 232b will be smaller, and the current flow area between the second tab 232b and the first electrode lead-out component 22a will be affected.

[0159] In some embodiments, the distance K2 between the second tab 232b and the second wall 214 along the second direction Y can be, but is not limited to, any one or any two of 7mm, 10mm, 12mm, 16mm, 20mm, 25mm, 28mm, 30mm, 35mm, 40mm, 45mm or 50mm.

[0160] In some embodiments, the distance K1 between the first tab 232a and the second wall 214 along the second direction Y and the distance K2 between the second tab 232b and the second wall 214 along the second direction Y can be equal. Here, "equal" means approximately equal, and there may be processing and assembly errors.

[0161] By setting the distance between the first tab 232a and the second wall 214 along the second direction Y to be greater than or equal to 7 mm and less than or equal to 50 mm, the size of the first tab 232a along the second direction Y can be designed to be larger, the first tab 232a has a larger heat dissipation area, and the first electrode lead-out component 22a has a larger flow area, while also reducing the risk of interference between the first tab 232a and other components. Similarly, by setting the distance between the second tab 232b and the second wall 214 along the second direction Y to be greater than or equal to 7 mm and less than or equal to 50 mm, the size of the second tab 232b along the second direction Y can be designed to be larger, the second tab 232b has a larger heat dissipation area, and the second tab 232b has a larger flow area between the second tab 232b and the first electrode lead-out component 22a, while also reducing the risk of interference between the second tab 232b and other components.

[0162] According to some embodiments of this application, 12mm≤K1≤25mm, 12mm≤K2≤25mm.

[0163] When K1 ≥ 12 mm, the size of the first electrode tab 232a along the second direction Y can be designed to be larger, resulting in a larger heat dissipation area and a larger current flow area between the first electrode tab 232a and the first electrode lead-out component 22a. When K1 ≤ 25 mm, the risk of interference between the first electrode tab 232a and other components can be further reduced. When K2 ≥ 12 mm, the size of the second electrode tab 232b along the second direction Y can be designed to be larger, resulting in a larger heat dissipation area and a larger current flow area between the second electrode tab 232b and the first electrode lead-out component 22a. When K2 ≤ 25 mm, the risk of interference between the second electrode tab 232b and other components can be further reduced.

[0164] Please refer to Figures 9 and 10. Figure 9 is a schematic diagram of the assembly of the first electrode terminal and the first wall according to some embodiments of this application, and Figure 10 is a schematic diagram of the assembly state of the first electrode assembly and the second electrode assembly with the first adapter according to some embodiments of this application. According to some embodiments of this application, the first electrode lead-out component 22a includes a first electrode terminal 221a and a first adapter 222a. The first electrode terminal 221a is disposed on the first wall 213. The first electrode tab 232a and the second electrode tab 232b are connected to the first adapter 222a through a first solder mark 241. The first adapter 222a is connected to the first electrode terminal 221a.

[0165] The first electrode terminal 221a and the first adapter 222a can be separately configured to facilitate processing and manufacturing.

[0166] In some embodiments, a portion of the first electrode terminal 221a may be disposed in the first electrode lead-out hole 2131 of the first wall 213, and the first adapter 222a may be disposed inside the housing 21. The first electrode terminal 221a passes through the first electrode lead-out hole 2131 and is connected to the first adapter 222a.

[0167] In some embodiments, the first adapter 222a can be connected to the first electrode terminal 221a by a third solder mark 243. For example, the first adapter 222a and the first electrode terminal 221a are laser welded on the side of the first adapter 222a away from the first electrode terminal 221a to form the third solder mark 243, so that the first adapter 222a and the first electrode terminal 221a are firmly connected.

[0168] In some embodiments, the first solder mark 241 and the third solder mark 243 are spaced apart along the second direction Y to facilitate the assembly of the first electrode tab 232a and the second electrode tab 232b with the first electrode lead-out component 22a. For example, the first adapter 222a includes a first welding portion and a second welding portion. The first welding portion is welded to the first electrode tab 232a and the second electrode tab 232b, and the second welding portion is welded to the first electrode terminal 221a. The first welding portion and the second welding portion are spaced apart along the second direction Y.

[0169] In some embodiments, with the dimensions of the third solder mark 243 and the first solder mark 241 remaining unchanged, compared to the scheme where the third solder mark 243 and the first solder mark 241 do not overlap along the second direction Y, the third solder mark 243 and the first solder mark 241 can at least partially overlap along the second direction Y. The overall size of the third solder mark 243 and the first solder mark 241 formed by them is smaller in the first direction X, so that the third solder mark 243 and the first solder mark 241 occupy less assembly space in the first direction X, which is beneficial to improving the space utilization rate inside the battery cell 20.

[0170] In the above scheme, the first tab 232a and the second tab 232b are connected to the first adapter 222a through the first solder mark 241. The first adapter 222a is connected to the first electrode terminal 221a, which can provide a low-resistance current conduction path, facilitate efficient power transmission, facilitate heat dissipation of the first tab 232a, the second tab 232b and the first electrode lead-out component 22a, facilitate the charge and discharge cycle of the battery cell 20, and facilitate the improvement of the life of the battery cell 20.

[0171] Please refer to Figure 3 and further refer to Figure 11. Figure 11 is a schematic diagram of the assembly of the third and fourth electrodes and the second electrode lead-out component provided in some embodiments of this application. According to some embodiments of this application, the battery cell 20 further includes a second electrode lead-out component 22b, which is disposed on the first wall 213; the first electrode assembly 23a also has a third electrode tab 236a with the opposite polarity to the first electrode tab 232a, which is disposed at one end of the first main body portion 231a near the first wall 213; the second electrode assembly 23b also has a fourth electrode tab 236b with the opposite polarity to the second electrode tab 232b, which is disposed at one end of the second main body portion 231b near the first wall 213; wherein, on the projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the third electrode tab 236a and the orthographic projection of the fourth electrode tab 236b at least partially overlap, and the third electrode tab 236a and the fourth electrode tab 236b are connected to the second electrode lead-out component 22b through a second solder mark 242.

[0172] In some embodiments, the first wall 213 may be provided with a second electrode lead-out hole 2132, which penetrates the first wall 213 along the thickness direction Z. A portion of the second electrode lead-out component 22b may be provided in the second electrode lead-out hole 2132 so that the second electrode lead-out component 22b is internally electrically connected to the third tab 236a and the fourth tab 236b, and externally electrically connected to a conductive component (such as a busbar component) outside the battery cell 20 so that electrical energy can be led out or introduced through the second electrode lead-out component 22b.

[0173] The third electrode tab 236a may extend from the edge of the first main body portion 231a near the first wall 213, so as to connect the third electrode tab 236a to the second electrode lead-out member 22b. The fourth electrode tab 236b may extend from the edge of the second main body portion 231b near the first wall 213, so as to connect the fourth electrode tab 236b to the second electrode lead-out member 22b.

[0174] In some embodiments, the third electrode tab 236a and the first electrode tab 232a are spaced apart along a second direction, and the fourth electrode tab 236b and the second electrode tab 232b are spaced apart along the second direction Y. Referring to Figure 8, the third electrode tab 236a is closer to the third wall 215 than the first electrode tab 232a, and the first electrode tab 232a is closer to the second wall 214 than the third electrode tab 236a; the fourth electrode tab 236b is closer to the third wall 215 than the second electrode tab 232b, and the second electrode tab 232b is closer to the second wall 214 than the fourth electrode tab 236b.

[0175] With the thickness direction Z of the first wall as the projection direction, the orthographic projection of the third electrode 236a and the orthographic projection of the fourth electrode 236b can partially or completely overlap, so that the third electrode 236a and the fourth electrode 236b have a large connection area, so as to facilitate the convergence of electrical energy of the first electrode assembly 23a and the second electrode assembly 23b.

[0176] Referring to Figure 6, when assembling the first electrode assembly 23a and the second electrode assembly 23b with the second electrode lead-out component 22b, the first main body 231a and the second main body 231b can be located on opposite sides of the first wall 213 along the first direction X. The third electrode tab 236a and the fourth electrode tab 236b are stacked along the thickness direction Z of the first wall, and the stacked third electrode tab 236a and the fourth electrode tab 236b are aligned with the second electrode lead-out component 22b. The third electrode tab 236a, the fourth electrode tab 236b and the second electrode lead-out component 22b are welded so that the third electrode tab 236a and the fourth electrode tab 236b are connected to the second electrode lead-out component 22b through the second solder mark 242. After the third tab 236a and the fourth tab 236b are connected to the second electrode lead-out component 22b via the second solder mark 242, the third tab 236a, the fourth tab 236b and the second electrode lead-out component 22b are connected as one unit. The third tab 236a, the fourth tab 236b and the second electrode lead-out component 22b are firmly connected, and current can flow between the third tab 236a and the fourth tab 236b and the second electrode lead-out component 22b, realizing the electrical connection between the third tab 236a and the fourth tab 236b and the second electrode lead-out component 22b.

[0177] Compared to the connection process of the third electrode tab 236a and the second electrode lead-out component 22b respectively, the third electrode tab 236a and the fourth electrode tab 236b are stacked and then connected to the second electrode lead-out component 22b, which simplifies the assembly process and facilitates the improvement of the assembly efficiency of the first electrode assembly 23a and the second electrode assembly 23b with the second electrode lead-out component 22b.

[0178] In the above scheme, the third tab 236a and the fourth tab 236b are connected to the second electrode lead-out component 22b through the second solder mark 242. This not only ensures a reliable connection between the third tab 236a and the fourth tab 236b and the second electrode lead-out component 22b, but also simplifies the assembly process, improves the assembly efficiency of the third tab 236a and the fourth tab 236b and the second electrode lead-out component 22b, and improves the assembly efficiency of the battery cell 20.

[0179] Referring to Figure 11, according to some embodiments of this application, the third electrode tab 236a has a third root portion 237a, a third bend portion 238a, and a third connecting portion 239a. The third root portion 237a is connected to the first main body portion 231a, and the third bend portion 238a connects the third connecting portion 239a and the third root portion 237a. The fourth electrode tab 236b has a fourth root portion 237b, a fourth bend portion 238b, and a fourth connecting portion 239b. The fourth root portion 237b is connected to the second main body portion 231b, and the fourth bend portion 238b connects the fourth connecting portion 239b and the fourth root portion 237b. On the projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the third connecting portion 239a and the orthographic projection of the fourth connecting portion 239b at least partially overlap. The third connecting portion 239a and the fourth connecting portion 239b are connected to the second electrode lead-out component 22b through a second solder mark 242.

[0180] The third root portion 237a is the part where the third electrode tab 236a connects to the first main body portion 231a, and the third connecting portion 239a is the part where the third electrode tab 236a is connected to the second electrode lead-out component 22b; the third bending portion 238a connects the third connecting portion 239a and the third root portion 237a, so that the third electrode tab 236a can be a bent structure, and the third connecting portion 239a is bent relative to the third root portion 237a, so as to facilitate the connection of the third connecting portion 239a with the fourth electrode tab 236b and the second electrode lead-out component 22b.

[0181] The fourth root portion 237b is the part where the fourth electrode tab 236b connects to the second main body portion 231b, and the fourth connecting portion 239b is the part where the fourth electrode tab 236b connects to the second electrode lead-out component 22b; the fourth bending portion 238b connects the fourth connecting portion 239b and the fourth root portion 237b, so that the fourth electrode tab 236b can be a bent structure, and the fourth connecting portion 239b is bent relative to the fourth root portion 237b, so as to facilitate the connection of the fourth connecting portion 239b with the third electrode tab 236a and the second electrode lead-out component 22b.

[0182] In some embodiments, the third bend 238a and the fourth bend 238b are spaced apart along the first direction X.

[0183] In some embodiments, the third connecting portion 239a is bent from the third bending portion 238a toward the fourth bending portion 238b, and the fourth connecting portion 239b is bent from the fourth bending portion 238b toward the third bending portion 238a, so that the third connecting portion 239a and the fourth connecting portion 239b can be stacked in the thickness direction Z of the first wall; at the same time, a gap is formed between the third bending portion 238a and the fourth bending portion 238b, so that a large heat dissipation space is formed between the third tab 236a and the fourth tab 236b, which is conducive to improving the life of the battery cell 20. For example, along the first direction X, the third tab 236a retracts in the direction away from the second main body 231b, and the retracted part of the third tab 236a can be located at the third bend 238a. The fourth tab 236b retracts in the direction away from the first main body 231a, and the retracted part of the fourth tab 236b can be located at the fourth bend 238b, so that there is a large distance between the third bend 238a and the fourth bend 238b in the first direction X, which is conducive to heat dissipation of the third tab 236a and the fourth tab 236b.

[0184] In the above scheme, the third root portion 237a is connected to the first main body portion 231a, the third connecting portion 239a is bent relative to the third root portion 237a through the third bending portion 238a, the fourth root portion 237b is connected to the second main body portion 231b, and the fourth connecting portion 239b is bent relative to the fourth root portion 237b through the fourth bending portion 238b, so that the third connecting portion 239a and the fourth connecting portion 239b are at least partially stacked along the thickness direction Z of the first wall, so that the third connecting portion 239a and the fourth connecting portion 239b can be connected to the second electrode lead-out component 22b through the second solder mark 242, which facilitates the improvement of assembly efficiency.

[0185] Please refer to Figures 6, 7 and 11. According to some embodiments of this application, the second electrode lead-out component 22b includes a second electrode terminal 221b, and the third electrode tab 236a and the fourth electrode tab 236b are connected to the second electrode terminal 221b through a second solder mark 242.

[0186] A portion of the second electrode terminal 221b may be disposed in the second electrode lead-out hole 2132 of the first wall 213. The second electrode terminal 221b may be insulated from the first wall 213, or the second electrode terminal 221b may be electrically connected to the first wall 213.

[0187] When assembling the third electrode tab 236a and the fourth electrode tab 236b with the second electrode terminal 221b, the third electrode tab 236a and the fourth electrode tab 236b are first stacked, then the stacked third electrode tab 236a and the fourth electrode tab 236b are placed on the second electrode terminal 221b, and then the third electrode tab 236a and the fourth electrode tab 236b and the second electrode terminal 221b are soldered so that the third electrode tab 236a and the fourth electrode tab 236b are connected to the second electrode terminal 221b through the second solder mark 242.

[0188] In some embodiments, the second electrode terminal 221b may be disposed along the second direction Y, and the second electrode terminal 221b may have a larger size in the second direction Y. For example, the second electrode terminal 221b may be cuboid, and the length direction of the second electrode terminal 221b may be parallel to the second direction Y.

[0189] In the above scheme, the third tab 236a and the fourth tab 236b are connected to the second electrode terminal 221b through the second solder mark 242, which can reduce the number of components inside the battery cell 20 and help reduce manufacturing costs.

[0190] Referring to Figures 9 and 10, according to some embodiments of this application, the second electrode lead-out component 22b includes a second electrode terminal 221b and a second adapter 222b. The second electrode terminal 221b is disposed on the first wall 213. The third electrode tab 236a and the fourth electrode tab 236b are connected to the second adapter 222b through a second solder mark 242. The second adapter 222b is connected to the second electrode terminal 221b.

[0191] The second electrode terminal 221b and the second adapter 222b can be separately configured to facilitate manufacturing.

[0192] In some embodiments, a portion of the second electrode terminal 221b may be disposed in the second electrode lead-out hole 2132 of the first wall 213, and the second adapter 222b may be disposed inside the housing 21. The second electrode terminal 221b passes through the second electrode lead-out hole 2132 and is connected to the second adapter 222b.

[0193] In some embodiments, the second adapter 222b can be connected to the second electrode terminal 221b via a fourth solder mark 244. For example, on the side of the second adapter 222b facing away from the second electrode terminal 221b, the second adapter 222b and the second electrode terminal 221b are laser welded to form the fourth solder mark 244, so that the second adapter 222b and the second electrode terminal 221b are firmly connected.

[0194] In some embodiments, the second solder mark 242 and the fourth solder mark 244 are spaced apart along the second direction Y to facilitate the assembly of the third electrode tab 236a and the fourth electrode tab 236b with the second electrode lead-out component 22b. For example, the second adapter 222b includes a third welding portion and a fourth welding portion. The third welding portion is welded to the third electrode tab 236a and the fourth electrode tab 236b, and the fourth welding portion is welded to the second electrode terminal 221b. The third welding portion and the fourth welding portion are spaced apart along the second direction Y.

[0195] In some embodiments, along the second direction Y, the fourth solder mark 244 and the second solder mark 242 may at least partially overlap, so that the fourth solder mark 244 and the second solder mark 242 occupy a small assembly space in the first direction X, which is beneficial to improving the space utilization rate inside the battery cell 20.

[0196] In the above scheme, the third tab 236a and the fourth tab 236b are connected to the second adapter 222b through the second solder mark 242. The second adapter 222b is connected to the second electrode terminal 221b, which can provide a low-resistance current conduction path, facilitate efficient power transmission, facilitate heat dissipation of the third tab 236a, the fourth tab 236b and the second electrode lead-out component 22b, facilitate the charge and discharge cycle of the battery cell 20, and facilitate the improvement of the life of the battery cell 20.

[0197] Please refer to Figures 5 to 11. According to some embodiments of this application, the battery cell 20 further includes a first insulating member 25. The first insulating member 25 is disposed on the side of the first wall 213 facing the interior of the battery cell 20. The first insulating member 25 is used to separate the first wall 213 from the first electrode assembly 23a and the second electrode assembly 23b.

[0198] The material of the first insulating component 25 can be plastic, rubber, etc.

[0199] In some embodiments, the first insulating member 25 may be referred to as the lower plastic, and the first insulating member 25 insulatingly separates the first wall 213 from the first electrode assembly 23a and the second electrode assembly 23b.

[0200] The first insulating component 25 can be bonded to the inner surface of the first wall 213 so that the first insulating component 25 is firmly connected to the first wall 213, which facilitates the assembly and positioning of the first insulating component 25.

[0201] In some embodiments, the first insulating member 25 is provided with a first through hole and a second through hole. The first through hole corresponds to the first electrode lead-out hole 2131, and the second through hole corresponds to the second electrode lead-out hole 2132. A portion of the first electrode lead-out member 22a is disposed in the first through hole to facilitate electrical connection between the first electrode lead-out member 22a and the first electrode tab 232a and the second electrode tab 232b; a portion of the second electrode lead-out member 22b is disposed in the second through hole to facilitate electrical connection between the second electrode lead-out member 22b and the first electrode tab 232a and the second electrode tab 232b.

[0202] By providing a first insulating member 25 on the side of the first wall 213 facing the inside of the battery cell 20, the first wall 213 can be separated from the first electrode assembly 23a and the second electrode assembly 23b, thereby reducing the risk of short circuit between the positive and negative electrodes.

[0203] Please refer to Figure 3. According to some embodiments of this application, the surface of the battery cell 20 perpendicular to the first direction X is the surface with the largest area of ​​the battery cell 20.

[0204] The surface of the battery cell 20 perpendicular to the first direction X can be the large surface of the battery cell 20, and the thickness direction of the battery cell 20 can be parallel to the first direction X. When multiple battery cells 20 constitute the battery device 100, the multiple battery cells 20 can be stacked along the first direction X so that the battery device 100 can have a large capacity.

[0205] In the above scheme, the first direction X is perpendicular to the large surface of the battery cell 20, and the first direction X can be parallel to the thickness direction of the battery cell 20. Since the first tab 232a and the second tab 232b are stacked, the thickness of the battery cell 20 can be designed to be relatively thin.

[0206] According to some embodiments of this application, the size of the battery cell 20 along the first direction X is less than or equal to 35 mm.

[0207] In some embodiments, the size of the battery cell 20 along the first direction X can be any one or a range between any two of 35mm, 34mm, 33mm, 32mm, 31mm, 30mm, 29mm or 28mm.

[0208] In some embodiments, the first direction X may be parallel to the thickness direction of the battery cell 20, the size of the battery cell 20 along the first direction X is less than or equal to 35 mm, and the battery cell 20 may be a thin battery cell.

[0209] By setting the size of the battery cell 20 along the first direction X to be less than or equal to 35mm, the size of the battery cell 20 along the first direction X is small. By stacking the first tab 232a and the second tab 232b, the space occupied by the first tab 232a and the second tab 232b in the first direction X can be reduced, which is beneficial to the connection between the first tab 232a and the second tab 232b and the first electrode lead-out component 22a. Furthermore, when the space in the first direction X is limited, the first tab 232a and the second tab 232b are connected to the first electrode lead-out component 22a through the first solder mark 241. The first solder mark 241 can have a large area, which is conducive to improving the current carrying capacity between the first tab 232a and the second tab 232b and the first electrode lead-out component 22a. At the same time, the battery device 100 composed of the battery cell 20 can be provided with more battery cells 20 along the first direction X, which is conducive to improving the energy density of the battery device 100.

[0210] According to some embodiments of this application, along the first direction X, the size of the battery cell 20 is less than or equal to 32 mm.

[0211] By setting the size of the battery cell 20 along the first direction X to be less than or equal to 32mm, it is further beneficial that the battery device 100 composed of the battery cell 20 can be provided with more battery cells 20 along the first direction X, which facilitates the improvement of the energy density of the battery device 100.

[0212] According to some embodiments of this application, the outer casing 21 is rectangular.

[0213] Referring to Figure 3, the outer casing 21 includes a housing 211 and an end cap 212. The housing 211 includes two fourth walls 216 arranged opposite each other along the first direction X, a second wall 214 and a third wall 215 arranged opposite each other along the second direction Y, and a fifth wall 217. The second wall 214, the third wall 215, the fifth wall 217 and the two fourth walls 216 form a space with an opening at one end. The fifth wall 217 and the end cap 212 are arranged opposite each other along the thickness direction Z of the first wall. The end cap 212 closes the opening of the housing 211.

[0214] In the above scheme, the outer shell 21 is rectangular, with a simple structure and easy processing and manufacturing, and the battery device 100 can be equipped with a large number of the above-mentioned battery cells 20.

[0215] According to some embodiments of this application, both the first electrode assembly 23a and the second electrode assembly 23b are wound structures.

[0216] Both the first electrode assembly 23a and the second electrode assembly 23b are wound structures, which have high efficiency and simple processing technology during the manufacturing process of the first electrode assembly 23a and the second electrode assembly 23b, making them easy to manufacture and resulting in high assembly efficiency of the battery cell 20.

[0217] Please refer to Figure 3. According to some embodiments of this application, the outer casing 21 includes a housing 211 and an end cap 212. The housing 211 has an opening, and the end cap 212 closes the opening. The end cap 212 is a first wall 213.

[0218] The housing 211 and the end cap 212 cooperate to form a space for accommodating the first electrode assembly 23a and the second electrode assembly 23b, and the opening is for the first electrode assembly 23a and the second electrode assembly 23b to enter and exit the housing 211.

[0219] In some embodiments, the end cap 212 may be welded to the opening of the housing 211 to close the opening, thereby ensuring a secure connection between the end cap 212 and the housing 211.

[0220] End cap 212 is the first wall 213. When the first electrode assembly 23a includes the first electrode terminal 221a, the first electrode terminal 221a can be integrated into the end cap 212 to form the end cap 212 assembly. During the manufacturing process of the battery cell 20, the end cap 212 assembly can be assembled as a whole with the first electrode assembly 23a and the second electrode assembly 23b to improve assembly efficiency.

[0221] In the above scheme, the end cap 212 is the first wall 213, and the first electrode lead-out component 22a is disposed on the end cap 212, which facilitates the assembly of the first electrode tab 232a and the second electrode tab 232b with the first electrode lead-out component, and facilitates the assembly of the battery cell 20.

[0222] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 provided according to any of the above embodiments.

[0223] The battery device 100 is constructed using the aforementioned battery cell 20. Since the battery cell 20 has high assembly efficiency, the assembly efficiency of the battery device 100 can be improved.

[0224] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 or a battery device 100 provided according to any of the above embodiments, wherein the battery cell 20 or the battery device 100 is used to provide electrical energy.

[0225] The electrical device can be any of the above-mentioned devices or systems that use battery cell 20 or battery device 100 as power source.

[0226] According to some embodiments of this application, this application also provides an energy storage device, which includes a battery cell 20 or a battery device 100 provided according to any of the above embodiments, wherein the battery cell 20 or the battery device 100 is used to store electrical energy and is capable of providing electrical energy.

[0227] According to some embodiments of this application, referring to Figures 3 to 11, this application provides a battery cell 20, which includes a housing 21, a first electrode lead-out component 22a, a first electrode assembly 23a, a second electrode assembly 23b, and a second electrode lead-out component 22b. The housing 21 is cuboid. Along the first direction X, the size of the battery cell 20 is less than or equal to 35 mm. The surface of the battery cell 20 perpendicular to the first direction X is the surface with the largest area of ​​the battery cell 20.

[0228] The outer casing 21 includes a housing 211 and an end cap 212. The housing 211 has an opening, and the end cap 212 closes the opening. The end cap 212 is a first wall 213.

[0229] The first electrode lead-out component 22a and the second electrode lead-out component 22b are disposed on the first wall 213, and the first electrode assembly 23a and the second electrode assembly 23b are both disposed inside the outer casing 21.

[0230] The first electrode assembly 23a includes a first main body portion 231a and a first electrode tab 232a, the first electrode tab 232a being disposed at one end of the first main body portion 231a near the first wall 213; the second electrode assembly 23b includes a second main body portion 231b and a second electrode tab 232b, the second electrode tab 232b being disposed at one end of the second main body portion 231b near the first wall 213, the first main body portion 231a and the second main body portion 231b being stacked along a first direction X, and the first electrode tab 232a and the second electrode tab 232b having the same polarity.

[0231] On the projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the first tab 232a and the orthographic projection of the second tab 232b at least partially overlap, and the orthographic projection of the third tab 236a and the orthographic projection of the fourth tab 236b at least partially overlap.

[0232] In some embodiments, referring to Figures 5 to 7, the first electrode lead-out component 22a includes a first electrode terminal 221a, and a first tab 232a and a second tab 232b are connected to the first electrode terminal 221a through a first solder mark 241. This can reduce the number of components inside the battery cell 20 and help reduce manufacturing costs.

[0233] In some embodiments, referring to Figures 9 and 10, the first electrode lead-out component 22a includes a first electrode terminal 221a and a first adapter 222a. The first electrode terminal 221a is disposed on the first wall 213. The first tab 232a and the second tab 232b are connected to the first adapter 222a through a first solder mark 241. The first adapter 222a is connected to the first electrode terminal 221a, which can provide a low-resistance current conduction path, facilitate efficient power transmission, and help dissipate heat from the first tab 232a, the second tab 232b and the first electrode lead-out component 22a, and facilitate the charge and discharge cycles of the battery cell 20.

[0234] Compared to a single battery cell 20 with a single electrode assembly 23, in this application, the battery cell 20 includes a first electrode assembly 23a and a second electrode assembly 23b, and there is a larger heat dissipation space between the first tab 232a and the second tab 232b, which can reduce the overcurrent temperature rise at the first tab 232a and the second tab 232b, and facilitate the improvement of the battery cell 20's lifespan. The first tab 232a and the second tab 232b are stacked along the thickness direction Z of the first wall, and the first tab 232a and the second tab 232b are welded to the first electrode lead-out component 22a through a first solder mark 241. This not only ensures a reliable connection between the first tab 232a and the second tab 232b and the first electrode lead-out component 22a, but also simplifies the assembly process and facilitates improving the assembly efficiency of the first tab 232a and the second tab 232b and the first electrode lead-out component 22a. The third tab 236a and the fourth tab 236b are connected to the second electrode lead-out component 22b via the second solder mark 242. This ensures a reliable connection between the third tab 236a and the fourth tab 236b and the second electrode lead-out component 22b, simplifies the assembly process, and improves the assembly efficiency of the third tab 236a and the fourth tab 236b with the second electrode lead-out component 22b. The technical solution of this application enables the battery cell 20 to have a high assembly efficiency, thereby improving the assembly efficiency of the battery device 100 composed of the battery cell 20.

[0235] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A single battery cell, comprising: The outer shell, including the first wall; The first electrode lead-out component is disposed on the first wall; A first electrode assembly is disposed within the housing. The first electrode assembly includes a first main body and a first electrode tab, with the first electrode tab disposed at one end of the first main body near the first wall. The second electrode assembly is disposed inside the housing. The second electrode assembly includes a second main body and a second electrode tab. The second electrode tab is disposed at one end of the second main body near the first wall. The first main body and the second main body are stacked along a first direction. The first electrode tab and the second electrode tab have the same polarity. The first direction is perpendicular to the thickness direction of the first wall. In the projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first electrode tab and the orthographic projection of the second electrode tab at least partially overlap, and the first electrode tab and the second electrode tab are connected to the first electrode lead-out component through a first solder mark.

2. The battery cell according to claim 1, wherein, The first electrode has a first root portion, a first bent portion and a first connecting portion, the first root portion is connected to the first main body portion, and the first bent portion connects the first connecting portion and the first root portion; The second electrode has a second root portion, a second bend portion and a second connecting portion, the second root portion is connected to the second main body portion, and the second bend portion is connected to the second connecting portion and the second root portion; On the projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first connecting part and the orthographic projection of the second connecting part overlap at least partially, and the first connecting part and the second connecting part are connected to the first electrode lead-out component through the first solder mark.

3. The battery cell according to claim 2, wherein, Along the first direction, the first bend and the second bend are spaced apart.

4. The battery cell according to any one of claims 1-3, wherein, The first electrode lead-out component includes a first electrode terminal, and the first electrode tab and the second electrode tab are connected to the first electrode terminal through the first solder mark.

5. The battery cell according to claim 4, wherein, Along the second direction, the size of the first tab is W1, the size of the second tab is W2, and the size of the battery cell is L, satisfying 0.1≤W1 / L<0.5, 0.1≤W2 / L<0.5, and the second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other.

6. The battery cell according to claim 5, wherein, 0.2≤W1 / L≤0.4, 0.2≤W2 / L≤0.

4.

7. The battery cell according to any one of claims 4-6, wherein, The outer casing also includes a second wall and a third wall disposed opposite to each other along a second direction. Along the second direction, the distance between the first electrode tab and the second wall is less than the distance between the first electrode tab and the third wall. The second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other. Along the second direction, the distance between the first electrode tab and the second wall is K1, and the distance between the second electrode tab and the second wall is K2, satisfying 7mm≤K1≤50mm and 7mm≤K2≤50mm.

8. The battery cell according to claim 7, wherein, 12mm≤K1≤25mm, 12mm≤K2≤25mm.

9. The battery cell according to any one of claims 1-3, wherein, The first electrode lead-out component includes a first electrode terminal and a first adapter. The first electrode terminal is disposed on the first wall. The first electrode tab and the second electrode tab are connected to the first adapter through the first solder mark. The first adapter is connected to the first electrode terminal.

10. The battery cell according to any one of claims 1-9, wherein, The battery cell also includes: The second electrode lead-out component is disposed on the first wall; The first electrode assembly also has a third electrode with a polarity opposite to that of the first electrode tab, and the third electrode tab is disposed at one end of the first main body near the first wall; The second electrode assembly also has a fourth electrode with the opposite polarity to the second electrode tab, the fourth electrode tab being disposed at one end of the second main body near the first wall; In the projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the third electrode tab and the orthographic projection of the fourth electrode tab at least partially overlap, and the third electrode tab and the fourth electrode tab are connected to the second electrode lead-out component through a second solder mark.

11. The battery cell according to claim 10, wherein, The third electrode has a third root, a third bend, and a third connecting part. The third root is connected to the first main body, and the third bend connects the third connecting part and the third root. The fourth electrode has a fourth root, a fourth bend, and a fourth connecting part. The fourth root is connected to the second main body, and the fourth bend connects the fourth connecting part and the fourth root. On the projection plane perpendicular to the thickness direction of the first wall, the orthographic projections of the third connection portion and the fourth connection portion at least partially overlap, and the third connection portion and the fourth connection portion are connected to the second electrode lead-out component through the second solder mark.

12. The battery cell according to claim 11, wherein, Along the first direction, the third bend and the fourth bend are spaced apart.

13. The battery cell according to claim 10, wherein, The second electrode lead-out component includes a second electrode terminal and a second adapter. The second electrode terminal is disposed on the first wall. The third electrode tab and the fourth electrode tab are connected to the second adapter through the second solder mark. The second adapter is connected to the second electrode terminal.

14. The battery cell according to any one of claims 1-13, wherein, The surface of the battery cell perpendicular to the first direction is the surface with the largest area of ​​the battery cell.

15. The battery cell according to any one of claims 1-14, wherein, Along the first direction, the size of the battery cell is less than or equal to 35 mm.

16. The battery cell according to claim 15, wherein, Along the first direction, the size of the battery cell is less than or equal to 32 mm.

17. The battery cell according to any one of claims 1-16, wherein, The battery cell also includes: A first insulating member is disposed on the side of the first wall facing the interior of the battery cell, and the first insulating member is used to separate the first wall from the first electrode assembly and the second electrode assembly.

18. The battery cell according to any one of claims 1-17, wherein, The outer casing includes a housing and an end cap, the housing having an opening, the end cap closing the opening, and the end cap being the first wall.

19. A battery device comprising a battery cell as claimed in any one of claims 1-18.

20. An electrical device comprising a battery cell as claimed in any one of claims 1-18 or a battery device as claimed in claim 19, wherein the battery cell or the battery device is used to provide electrical energy.

21. An energy storage device comprising a battery cell as claimed in any one of claims 1-18 or a battery device as claimed in claim 19, wherein the battery cell or the battery device is used to store electrical energy and is capable of providing electrical energy.

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