Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, a first electrode terminal, a first current collecting member, a first insulating piece and an electrode assembly. The electrode assembly comprises a main body part and a first tab. The first current collecting member comprises a first current collecting part located between the main body part and a first wall and connected with the first electrode terminal, and a second current collecting part located between the main body part and a second wall. The first tab comprises a first connecting part located on a side of the second current collecting part away from the main body part and connected with the second current collecting part. The first connecting part has a first extension area beyond one end of the second current collecting part away from the first current collecting part. The first insulating piece is bent to form a first insulating part and a second insulating part. The first insulating part is located between the main body part and the first extension area. The second insulating part is arranged on a side of the main body part away from the first wall, so as to reduce the risk of inserting the first tab into the main body part and the risk of the first tab being overlapped with the side of the main body part.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing day by day.

[0003] In battery technology, a battery device includes a housing and battery cells housed within the housing. Each battery cell includes a casing and electrode assemblies housed within the casing. Correspondingly, electrode terminals are also provided on the casing. By connecting the electrode terminals to the tabs of the electrode assemblies, the input or output of electrical energy of the battery cell can be realized through the electrode terminals. However, the electrode assemblies of existing battery cells are prone to short circuits during use, resulting in low reliability of the battery cells. Summary of the Invention

[0004] This application provides a battery cell, a battery device, and an electrical device, which can effectively improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a casing, a first electrode terminal, a first current collector, a first insulating member, and at least one electrode assembly; the casing has a first wall and a second wall connected to each other, the thickness direction of the first wall is parallel to a first direction, the thickness direction of the second wall is parallel to a second direction, and the first direction is perpendicular to the second direction; the first electrode terminal is disposed on the first wall; the electrode assembly is disposed within the casing, the electrode assembly includes a main body and a first tab, the first tab being connected to one end of the main body near the second wall in the second direction; the first current collector is disposed within the casing, the first current collector including a first current collector portion and a second current collector portion connected to each other, the first current collector portion being located within the casing. The first electrode tab includes a first connecting portion located on the side of the second current collector away from the body portion and the first wall in the second direction. The first connecting portion is connected to the second current collector and has a first extension area extending beyond the second current collector away from the first current collector in the first direction. The first insulating member includes an integrally formed first insulating portion and a second insulating portion. At least a portion of the first insulating portion is located between the body portion and the first extension area in the second direction. The second insulating portion is disposed on the side of the body portion away from the first wall in the first direction.

[0006] In the above technical solution, the first electrode terminal is disposed on the first wall of the housing, and the first electrode tab is connected to the end near the second wall, so that the first electrode terminal and the first electrode tab are respectively located on different sides of the main body. This helps to reduce the interference between the first electrode terminal and the first electrode tab, and facilitates the configuration of the first electrode tab with a first connecting portion formed on the side of the second current collector away from the main body and connected to the second current collector. This allows the first electrode tab to be bent and at least partially extended to the side of the second current collector away from the main body, thereby reducing the phenomenon of the second current collector pressing down on the first electrode tab during use, reducing the risk of damage to the first electrode tab, and enabling the second current collector and the first electrode tab to share space in the second direction, thereby improving the internal space utilization of the battery cell. The electrode assembly also includes a first insulating member, which includes an integrally formed first insulating portion and a second insulating portion. At least a portion of the first insulating portion is located between the main body and the first extension area in the second direction, and the second insulating portion... The first insulating member is disposed on the side of the main body facing away from the first wall in the first direction. The first insulating member is structured by bending to form a first insulating part and a second insulating part. At least a portion of the edge of the end face of the main body facing the second wall away from the first wall in the first direction is covered by the first insulating member. The first insulating member extends between the main body and the first extension area and extends to the side of the main body facing away from the first wall. The battery cell with this structure can improve the reliability of the first insulating member on the electrode assembly and improve the insulation and isolation effect of the first insulating member on the first extension area and the main body. This reduces the pressure of the second current collector on the first tab, alleviates the phenomenon of the first tab being inserted backward into the main body in the second direction, and reduces the phenomenon of the first tab overlapping with the side of the main body facing away from the first wall in the first direction. In this way, the risk of internal short circuit during use of the battery cell can be effectively reduced, thereby improving the reliability of the battery cell.

[0007] In some embodiments, a portion of the first insulating portion is located between the main body portion and the second current collector portion.

[0008] In the above technical solution, by setting a portion of the first insulating part to be located between the main body and the second current collector, the portion of the first insulating part extends in the first direction between the main body and the second current collector. The battery cell with this structure can, on the one hand, further reinforce the first insulating part through the main body and the second current collector, thereby improving the stability of the first insulating part located between the main body and the first extension area. This helps to alleviate the phenomenon of the first insulating part tilting or shifting during use. On the other hand, the first insulating part and the second current collector have an overlapping area in the second direction, so that the first insulating part can better separate the first extension area of ​​the first connecting part that extends beyond the second current collector and is far away from the first current collector. This further improves the insulation isolation effect of the first insulating member on the first extension area and the main body, thereby further reducing the risk of the first electrode being inserted backward into the main body along the second direction.

[0009] In some embodiments, along the second direction, the portion of the second insulating portion protruding from the side of the first insulating portion facing the main body has a dimension of 2mm-50mm.

[0010] In the above technical solution, on the one hand, the length of the portion of the second insulating part protruding from the side of the first insulating part facing the main body along the second direction is set to be greater than or equal to 2mm, so as to increase the area covered by the second insulating part on the side of the main body away from the first wall, thereby further reducing the risk of the first electrode tab and the side of the main body away from the first wall overlapping each other, and improving the stability of the second insulating part on the side of the main body away from the first wall. On the other hand, the length of the portion of the second insulating part protruding from the side of the first insulating part facing the main body along the second direction is set to be less than or equal to 50mm, so as to reduce the excessive waste of the length of the second insulating part and the excessive space occupied, thereby saving the manufacturing cost of the battery cell and improving the internal space utilization of the battery cell.

[0011] In some embodiments, the second insulating portion is connected to the surface of the body portion facing away from the first wall in the first direction.

[0012] In the above technical solution, by connecting the second insulating part to the surface of the main body away from the first wall in the first direction, the stability and reliability of the second insulating part disposed on the side of the main body away from the first wall are improved, thereby alleviating the phenomenon of the second insulating part lifting or shifting during use, and further reducing the risk of the first electrode tab overlapping with the side of the main body away from the first wall.

[0013] In some embodiments, the first electrode tab bends around the second current collector to form a first root, a first bend, and a first connecting portion connected in sequence, and the first root is connected to the main body; wherein, the first bend is located on one side of the second current collector in a third direction, and at least a portion of the second current collector is located between the first root and the first connecting portion in the second direction and is connected to the first connecting portion, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0014] In the above technical solution, by setting the first bending portion to be located on the side of the second current collector in the third direction, and setting at least a part of the second current collector to be located between the first root portion and the first connecting portion in the second direction, the first electrode tab is formed with a first connecting portion located on the side of the second current collector away from the main body portion. The battery cell with this structure can reduce the assembly difficulty of the second current collector and the first connecting portion and increase the connection area between the second current collector and the first connecting portion. On the other hand, it can realize that the first electrode tab and the second current collector share part of the space in the second direction and the third direction, which is beneficial to improving the internal space utilization of the battery cell.

[0015] In some embodiments, at least a portion of the first insulating portion is located between the first extension region and the first root and is connected to the surface of the first root facing the first extension region.

[0016] In the above technical solution, by setting the first insulating part to be at least partially located between the first extension area and the first root and connected to the first root, on the one hand, the first insulating part can separate the first extension area and the main body, and on the other hand, it can reduce the difficulty of setting the first insulating part between the main body and the first extension area. Furthermore, the first insulating part can also play a separating role between the first extension area and the first root. On the other hand, it can improve the stability of the first insulating part set between the main body and the first extension area, which is beneficial to alleviate the phenomenon of the first insulating part lifting or shifting during use.

[0017] In some embodiments, the first insulating member further includes a third insulating portion, which is disposed on one side of the main body and connected to the end of the first insulating portion away from the first bending portion along the third direction.

[0018] In the above technical solution, the first insulating member also includes a third insulating member disposed on one side of the main body in the third-third upward direction, and the third insulating member is connected to the end of the first insulating member away from the first bending portion. The battery cell with this structure can, on the one hand, enable the first insulating member to cover at least a portion of the main body on the side of the main body in the third-third upward direction near the third insulating member, which helps to reduce the risk of the first electrode extending to the side of the main body in the third-third upward direction near the third insulating member and overlapping with the main body. It can also achieve a structure in which at least a portion of the edge of the end face of the main body facing the second wall on the side of the main body in the third-third upward direction near the third insulating member is covered by the first insulating member, which helps to further reduce the phenomenon of the first electrode being inserted into the main body, thereby further reducing the risk of internal short circuits in the battery cell during use. On the other hand, it can further increase the contact area between the first insulating member and the electrode assembly, so as to further improve the assembly stability and reliability between the first insulating member and the electrode assembly.

[0019] In some embodiments, the third insulating portion is connected to the second insulating portion.

[0020] In the above technical solution, by further setting the third insulating part and the second insulating part as interconnected structures, the structural stability of the first insulating member as a whole on the electrode assembly can be further improved, thereby reducing the phenomenon of the first insulating member falling off during use. It can also further improve the covering effect of the first insulating member on the main body, thereby further reducing the phenomenon of the first electrode tab being inserted into the main body or overlapping with the main body, which is conducive to further reducing the risk of internal short circuit in the battery cell during use.

[0021] In some embodiments, the first insulating portion, the second insulating portion, and the third insulating portion are integrally formed.

[0022] In the above technical solution, by setting the first insulating part, the second insulating part and the third insulating part of the first insulating member as an integrally formed structure, the first insulating part, the second insulating part and the third insulating part are an integral structure formed by bending the first insulating member. The first insulating member with this structure can improve the overall structural strength of the first insulating member and reduce the assembly difficulty between the first insulating member and the electrode assembly. On the other hand, it can further improve the effect of the first insulating member in separating the first electrode tab and the main body, which is conducive to further reducing the risk of short circuit between the first electrode tab and the main body during use.

[0023] In some embodiments, the third insulating portion is connected to the surface of the body portion on the third-facing side.

[0024] In the above technical solution, by connecting the third insulating part to the surface of the main body on the third-side upward side, the stability and reliability of the third insulating part being disposed on the third-side upward side of the main body can be improved, thereby alleviating the phenomenon of the third insulating part lifting or shifting during use, and improving the assembly stability between the first insulating member and the electrode assembly.

[0025] In some embodiments, the battery cell includes two electrode assemblies stacked along the third direction, the first connecting portions of the first tabs of the two electrode assemblies are all connected to the same second current collector, and the first bent portions of the first tabs of the two electrode assemblies are respectively located on both sides of the second current collector along the third direction.

[0026] In the above technical solution, by setting the first bent portions of the first tabs of the two electrode assemblies to be located on both sides of the second current collector in the third direction, and the first connecting portions of the first tabs of the two electrode assemblies being connected to the same second current collector, the first tabs of the two electrode assemblies are bent around the same second current collector in opposite directions. The battery cell with this structure can optimize the internal space layout of the battery cell, improve the internal space utilization of the battery cell, reduce the assembly difficulty of the battery cell, and save the manufacturing cost of the battery cell. On the other hand, the second current collector can also cover the gap between the main bodies of the two electrode assemblies to a certain extent, which can help alleviate the risk of the first connecting portion of the first tab being inserted into the gap between the main bodies of the two electrode assemblies and causing a short circuit inside the battery cell.

[0027] In some embodiments, the battery cell includes two first insulating members, each of which is disposed on one of the electrode assemblies.

[0028] In the above technical solution, by setting a first insulating member in the housing for each electrode assembly, it is beneficial to reduce the assembly difficulty between the first insulating member and the electrode assembly, and to improve the effect of the first insulating member in separating the first tab and the main body of the corresponding electrode assembly.

[0029] In some embodiments, the electrode assembly is a stacked structure, the main body includes a plurality of first electrodes with the same polarity, the plurality of first electrodes are stacked along a third direction, the first electrode tab includes a plurality of stacked first electrode tabs, each first electrode is connected to a first electrode tab at one end near the second wall in the second direction, and the first electrode and the first electrode tab are integrally formed, the first direction, the second direction and the third direction are perpendicular to each other; wherein, along the first direction, at least one end of the first electrode tab is flush with one end of the corresponding first electrode.

[0030] In the above technical solution, by setting the electrode assembly as a stacked structure, it is beneficial to improve the space utilization of the electrode assembly and thus improve the energy density of the battery cell. In particular, by setting the first electrode sheet and the first electrode tab as an integrally formed structure, and setting at least one end of the first electrode tab in the first direction to be flush with one end of the corresponding first electrode sheet, it is convenient to increase the width of the first electrode tab in the first direction to improve the current carrying capacity of the first electrode tab. On the other hand, it is convenient to uniformly cut the first electrode tab and the first electrode sheet during the processing and forming of the first electrode tab and the first electrode sheet, at least eliminating the need for secondary cutting of one end of the first electrode tab in the first direction. This helps to reduce the forming difficulty of the first electrode tab and the first electrode sheet, and can optimize the production process and production cycle of the electrode assembly.

[0031] In some embodiments, along the first direction, the end of the first electrode tab near the first wall is flush with the end of the corresponding first electrode near the first wall.

[0032] In the above technical solution, by setting the end of the first tab near the first wall in the first direction to be flush with the end of the corresponding first electrode near the first wall, the first tab is configured such that the end of the first tab near the first current collector in the first direction is flush with the end of the corresponding first electrode near the first wall. This increases the area of ​​the first connecting part of the first tab that overlaps with the second current collector in the second direction, which is beneficial to increasing the connection area between the first connecting part and the second current collector, thereby improving the current flow effect between the first tab and the second current collector.

[0033] In some embodiments, along the first direction, the end of the first electrode tab away from the first wall is flush with the end of the corresponding first electrode tab away from the first wall.

[0034] In the above technical solution, by further configuring the end of the first electrode tab away from the first wall in the first direction to be flush with the end of the corresponding first electrode away from the first wall, the two ends of the first electrode tab in the first direction are respectively flush with the two ends of the corresponding first electrode. This can further increase the width of the first electrode tab in the first direction, thereby further improving the current carrying effect of the first electrode tab. On the other hand, it can further facilitate the uniform cutting of the two ends of the first electrode tab and the first electrode during the processing and forming of the first electrode tab and the first electrode, eliminating the need for secondary cutting of the two ends of the first electrode tab in the first direction. This helps to further reduce the forming difficulty of the first electrode tab and the first electrode, and can further optimize the production process and production cycle of the electrode assembly.

[0035] In some embodiments, the housing further has a third wall, which is disposed opposite to the second wall in the second direction and is connected to the first wall; the battery cell further includes a second electrode terminal and a second current collector, the second electrode terminal being disposed on the first wall and the second current collector being disposed within the housing, the second current collector including a third current collector and a fourth current collector connected to each other, the third current collector being located between the main body and the first wall and connected to the second electrode terminal, and the fourth current collector extending from the third current collector to between the main body and the third wall; wherein, the electrode assembly further includes a second tab, the polarity of the second tab being opposite to that of the first tab, the second tab being connected to the end of the main body facing the third wall along the second direction, and the second tab being connected to the fourth current collector.

[0036] In the above technical solution, by setting the first and second electrodes with opposite polarities in the electrode assembly to be connected to the two ends of the main body in the second direction, and the second current collector of the first current collector and the fourth current collector of the second current collector are respectively located on both sides of the main body in the second direction and connected to the first and second electrodes, on the one hand, the interference between the second current collector and the fourth current collector can be reduced, which is conducive to reducing the assembly difficulty between the second current collector and the first electrode and between the fourth current collector and the second electrode. On the other hand, while realizing the input or output of electrical energy of the battery cell, the overlapping phenomenon between the first and second electrodes and between the second and fourth current collectors can be reduced, which is conducive to further reducing the risk of internal short circuits in the battery cell during use.

[0037] In some embodiments, the battery cell further includes a separator; the separator is made of an insulating material, the separator has a receiving space, at least a portion of the electrode assembly is located within the receiving space, and at least a portion of the second current collector is located within the receiving space.

[0038] In the above technical solution, the battery cell is also provided with an insulating separator, and at least a portion of the electrode assembly and at least a portion of the second current collector are located within the receiving space of the separator, so that the separator has a structure that covers at least a portion of the electrode assembly and at least a portion of the second current collector. The battery cell with this structure can, on the one hand, achieve the integration of the electrode assembly and the first current collector into an integral structure through the separator, which helps to reduce the assembly difficulty of the battery cell and improve the overall structural stability between the electrode assembly and the first current collector. On the other hand, the separator can also play an insulating role between the electrode assembly and the shell and between the second current collector and the shell, which helps to alleviate the overlap phenomenon between the electrode assembly and the shell and between the second current collector and the shell, so as to further reduce the risk of internal short circuits in the battery cell during use.

[0039] In some embodiments, the housing includes a housing and an end cap; the housing has an opening at at least one end in the first direction, and at least a portion of the electrode assembly is housed within the housing; the end cap closes the opening; wherein the end cap is the first wall, and the housing includes a second wall.

[0040] In the above technical solution, by setting the first wall with the first electrode terminal as the end cap of the housing, and setting the second wall facing the first electrode tab as a wall of the housing, the battery cell with this structure can reduce the assembly difficulty between the first current collector and the first electrode terminal, and can reduce the difficulty of assembling the electrode assembly and the second current collector into the housing after they are connected to each other, thereby reducing the manufacturing difficulty of the battery cell and improving the production efficiency of the battery cell.

[0041] In some embodiments, the capacity of the battery cell is greater than or equal to 500Ah.

[0042] In the above technical solution, by setting the capacity of the battery cell to be greater than or equal to 500Ah, the battery cell is a large-capacity battery cell structure. This requires a large overcurrent requirement. Therefore, by increasing the size of the first tab to meet the overcurrent requirement, the first insulating component can alleviate the risk of short circuit between the enlarged first tab and the main body. This allows the use of large-capacity battery cells to be met while improving the reliability of the battery cells.

[0043] In some embodiments, the outer casing is rectangular, with a dimension L1 in the first direction, a dimension L2 in the second direction, and a dimension L3 in the third direction, wherein the first direction, the second direction, and the third direction are mutually perpendicular; wherein, 3720cm 3 ≤L1×L2×L3≤12500cm 3And 120mm≤L1≤400mm, 200mm≤L2≤1500mm, 60mm≤L3≤150mm.

[0044] In the above technical solution, the battery cell's casing is a cuboid structure, with dimensions of 120mm-400mm, 200mm-1500mm, and 60mm-150mm in the first, second, and third directions, respectively, and a total volume of 3720cm³. 3 -12500cm 3 This results in a large-capacity battery cell structure with a larger volume, which requires a larger current flow. Therefore, by increasing the size of the first tab to meet the current flow requirement, the first insulating component can mitigate the risk of short circuit between the increased size of the first tab and the main body. This allows the battery cell to meet the requirements of large capacity while improving its reliability.

[0045] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0046] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell, wherein the battery cell is used to provide electrical energy. Attached Figure Description

[0047] 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.

[0048] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0049] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0050] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0051] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0052] Figure 5 A cross-sectional view of a battery cell perpendicular to a third direction, provided in some embodiments of this application;

[0053] Figure 6 for Figure 5A magnified view of part A of the shown battery cell;

[0054] Figure 7 A cross-sectional view of a battery cell perpendicular to a first direction provided in some embodiments of this application;

[0055] Figure 8 for Figure 7 A magnified view of part B of the shown battery cell;

[0056] Figure 9 This is an assembly diagram of the electrode assembly and the first current collector of a battery cell provided in some embodiments of this application;

[0057] Figure 10 This is a schematic diagram of the structure of an electrode assembly provided in some embodiments of this application;

[0058] Figure 11 A cross-sectional view of an electrode assembly provided in some embodiments of this application, perpendicular to a first direction;

[0059] Figure 12 This is a schematic diagram of the structure of the first insulating element provided in some embodiments of this application;

[0060] Figure 13 This is a schematic diagram showing the connection of the first electrode plate and the first electrode lug plate provided in some embodiments of this application.

[0061] Icons: 1000 - Vehicle; 100 - Battery assembly; 10 - Housing; 11 - First housing body; 12 - Second housing body; 20 - Battery cell; 21 - Housing; 21a - First wall; 21b - Second wall; 21c - Third wall; 211 - Housing; 2111 - Opening; 212 - End cap; 2121 - First electrode lead-out hole; 22 - First electrode terminal; 23 - First current collector; 231 - First current collector; 232 - Second current collector; 24 - First insulation; 241 - First insulation; 242 - Second insulation; 243 - Third insulation; 25 - Electrode assembly; 251 - Main body; 2511 - First electrode; 2512 - Second electrode; 2513 - Isolator; 252-First tab; 252a-First tab piece; 2521-First root; 2522-First bend; 2523-First connection; 2523a-First extension area; 253-Second tab; 253a-Second tab piece; 2531-Second root; 2532-Second bend; 2533-Second connection; 26-Second electrode terminal; 27-Second current collector; 271-Third current collector; 272-Fourth current collector; 28-Pressure relief component; 29-Second insulation; 30-Separator; 31-Receiving space; 40-First solder mark; 200-Controller; 300-Motor; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0063] 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 accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0064] In this application, the reference to "embodiment" means that a particular 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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive 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 the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0068] In this application, "multiple" means two or more (including two).

[0069] 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.

[0070] The battery cell can be a 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., and the embodiments of this application are not limited to this.

[0071] 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, serves to prevent short circuits to some extent while allowing active ions to pass through.

[0072] 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.

[0073] 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.

[0074] 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 aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors 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.).

[0075] 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 battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0076] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0077] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0078] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0079] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0080] As an example, 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.

[0081] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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 battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0082] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0083] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0084] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0085] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0086] 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.

[0087] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0088] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0089] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0090] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0091] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0092] As an example, polymer solid electrolytes can be polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0093] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0094] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0095] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0096] In some implementations, the electrode assembly has a stacked structure.

[0097] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0098] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0099] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0100] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0101] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0102] In some embodiments, the electrode assembly can be in the shape of a cuboid, a flat shape, or a polygonal prism.

[0103] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0104] 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), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0109] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0110] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0111] 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.

[0112] 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.

[0113] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0114] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0115] For a typical battery cell, the battery cell includes a casing and an electrode assembly housed within the casing. The electrode assembly includes a main body and tabs connected to the main body. Correspondingly, the casing also has electrode terminals, and a current collector is provided inside the casing. By welding the current collector to the electrode terminals and the current collector to the tabs, an electrical connection between the electrode assembly and the electrode terminals is achieved. This allows the battery cell to input or output electrical energy through the electrode terminals. In related technologies, especially in large-capacity and large-volume battery cells, the current requirements of the electrode assembly are relatively large, resulting in relatively large tabs. Since the tabs of the electrode assembly are a structure formed by stacking and folding multiple tabs of the same polarity to form tabs protruding from one end of the main body of the electrode assembly, during the use of the battery cell, the tabs are prone to being inserted upside down into the main body of the electrode assembly, which can lead to a risk of short circuit in the electrode assembly, thus hindering the reliability of the battery cell.

[0116] Based on the above considerations, in order to solve the problem of low reliability of battery cells, this application provides a battery cell including a casing, a first electrode terminal, a first current collector, a first insulating member, and at least one electrode assembly. The casing has a first wall and a second wall connected to each other. The thickness direction of the first wall is parallel to a first direction, and the thickness direction of the second wall is parallel to a second direction. The first direction is perpendicular to the second direction. The first electrode terminal is disposed on the first wall. The electrode assembly is disposed inside the casing and includes a main body and a first tab. The first tab is connected to the end of the main body near the second wall in a second direction. The first current collector is disposed inside the casing and includes a first current collector portion and a second current collector portion connected to each other. The first current collector portion is located between the main body and the first wall and is connected to the first electrode terminal. The second current collector portion extends from the first current collector portion to the space between the main body and the second wall. The first tab includes a first connecting portion located on the side of the second current collector portion away from the main body portion in a second direction. The first connecting portion is connected to the second current collector portion, and the first connecting portion has a first extension area extending beyond the end of the second current collector portion away from the first current collector portion in a first direction. The first insulating member includes an integrally formed first insulating portion and a second insulating portion. At least a portion of the first insulating portion is located between the main body portion and the first extension region in a second direction, and the second insulating portion is disposed on the side of the main body portion facing away from the first wall in a first direction.

[0117] In this battery cell structure, the first electrode terminal is disposed on the first wall of the casing, and the first tab is connected to the end near the second wall, so that the first electrode terminal and the first tab are located on different sides of the main body, which helps to reduce interference between the first electrode terminal and the first tab. It also facilitates the configuration of the first tab having a first connecting portion located on the side of the second current collector opposite to the main body and connected to the second current collector. This allows the first tab to be bent and at least partially extend to the side of the second current collector opposite to the main body, thereby reducing the phenomenon of the second current collector pressing down on the first tab during use, reducing the risk of damage to the first tab. Furthermore, it allows the second current collector and the first tab to share space in the second direction, improving the internal space utilization of the battery cell. The electrode assembly also includes a first insulating member, comprising an integrally formed first insulating portion and a second insulating portion. At least a portion of the first insulating portion is located between the main body and the first extension area in the second direction, and the second insulating portion... The edge portion is located on the side of the main body facing away from the first wall in the first direction, so that the first insulating member has a structure formed by bending to form a first insulating portion and a second insulating portion. This results in at least a portion of the edge of the end face of the main body facing the second wall that is away from the first wall in the first direction being covered by the first insulating member. The first insulating member extends between the main body and the first extension area and extends to the side of the main body facing away from the first wall. The battery cell with this structure can improve the reliability of the first insulating member on the electrode assembly and improve the insulation and isolation effect of the first insulating member on the first extension area and the main body. This reduces the pressure of the second current collector on the first electrode tab, alleviates the phenomenon of the first electrode tab being inserted backward into the main body in the second direction, and reduces the phenomenon of the first electrode tab overlapping with the side of the main body facing away from the first wall in the first direction. This effectively reduces the risk of internal short circuits in the battery cell during use and improves the reliability of the battery cell.

[0118] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and battery devices disclosed in this application can be used to construct such an electrical device. This helps alleviate the problem of the electrode tabs being inserted upside down into the main body of the electrode assembly during use, thereby improving the reliability of the battery cells.

[0119] This application provides an electrical device that uses a single battery cell or battery assembly as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0120] 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.

[0121] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 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. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. 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 supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0122] In some embodiments of this application, the battery device 100 can not only serve as the operating power or 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.

[0123] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, which are housed within the housing 10.

[0124] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0125] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0126] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in 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, in 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, in parallel, or in a mixed configuration to form battery modules, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0127] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0128] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cuboid or other shapes, etc. For example, in... Figure 3 In the middle, the battery cell 20 has a cuboid structure.

[0129] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 , Figure 4 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Figure 5 This is a cross-sectional view of a battery cell 20 perpendicular to a third direction Z, provided in some embodiments of this application. Figure 6 for Figure 5 A magnified view of part A of the battery cell 20 shown. Figure 7 This is a cross-sectional view of a battery cell 20 provided in some embodiments of this application, perpendicular to the first direction X. Figure 8 for Figure 7 The image shows a partial enlarged view of point B on the battery cell 20. Figure 9 This is an assembly diagram of the electrode assembly 25 and the first current collector 23 of the battery cell 20 provided in some embodiments of this application. Figure 10 This is a schematic diagram of the structure of the electrode assembly 25 provided in some embodiments of this application. Figure 11 This is a cross-sectional view of the electrode assembly 25 provided in some embodiments of this application, perpendicular to the first direction X. Figure 12This is a schematic diagram of the structure of the first insulating member 24 provided in some embodiments of this application. This application provides a battery cell 20, which includes a housing 21, a first electrode terminal 22, a first current collector 23, a first insulating member 24, and at least one electrode assembly 25. The housing 21 has a first wall 21a and a second wall 21b connected to each other. The thickness direction of the first wall 21a is parallel to a first direction X, and the thickness direction of the second wall 21b is parallel to a second direction Y. The first direction X is perpendicular to the second direction Y. The first electrode terminal 22 is disposed on the first wall 21a. The electrode assembly 25 is disposed within the housing 21, and the electrode assembly 25 includes a main body 251 and a first tab 252. The first tab 252 is connected to the end of the main body 251 near the second wall 21b in the second direction Y. The first current collector 23 is disposed inside the housing 21. The first current collector 23 includes a first current collector 231 and a second current collector 232 connected to each other. The first current collector 231 is located between the main body 251 and the first wall 21a and is connected to the first electrode terminal 22. The second current collector 232 extends from the first current collector 231 to the area between the main body 251 and the second wall 21b. The first electrode tab 252 includes a first connecting portion 2523 located on the side of the second current collector 232 away from the main body 251 in the second direction Y. The first connecting portion 2523 is connected to the second current collector 232, and the first connecting portion 2523 has a first extension area 2523a extending beyond the second current collector 232 and away from the first current collector 231 in the first direction X. The first insulating member 24 includes an integrally formed first insulating portion 241 and a second insulating portion 242. At least a portion of the first insulating portion 241 is located between the main body portion 251 and the first extension area 2523a in the second direction Y. The second insulating portion 242 is disposed on the side of the main body portion 251 facing away from the first wall 21a in the first direction X.

[0130] The outer shell 21 can also be used to contain electrolytes, such as electrolyte solution. The outer shell 21 can have various structural forms, such as a cuboid. Similarly, the outer shell 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0131] In some embodiments, the housing 21 can be a sealed structure or a non-sealed structure. As an example, when the housing 21 is a sealed structure, it can protect the electrode assembly 25 and prevent, to some extent, electrolyte leakage. When the housing 21 is a non-sealed structure, it can still protect the electrode assembly 25, and a sealing bag may be included between the housing 21 and the electrode assembly 25 to encapsulate the electrode assembly 25 and the electrolyte.

[0132] Optionally, the housing 21 may include a housing 211 and an end cap 212. The housing 211 has an internal cavity for accommodating the electrode assembly 25 and has an opening 2111. That is, the housing 211 is a hollow structure with an opening 2111 at one end. The end cap 212 covers the opening 2111 of the housing 211 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 25 and the electrolyte.

[0133] The housing 211 includes a bottom wall and a side wall. The bottom wall is disposed opposite to the end cover 212. The side wall surrounds the bottom wall and includes a plurality of wall portions arranged sequentially and connected along the circumference of the opening 2111. One end of the side wall is connected to the bottom wall, and the other end surrounds the opening 2111.

[0134] It should be noted that the first wall 21a used to set the first electrode terminal 22 can be the end cap 212 of the housing 21, or it can be a wall of the housing 211 of the housing 21. For example, in... Figure 3 and Figure 4 In this configuration, the first wall 21a is the end cap 212, and correspondingly, the second wall 21b is one of the multiple wall portions of the side wall of the housing 211. The housing 21 also includes a third wall 21c, where the third wall 21c and the second wall 21b are two wall portions of the housing 211 arranged opposite each other in the second direction Y. That is, the second wall 21b and the third wall 21c are located on opposite sides of the electrode assembly 25 in the second direction Y. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the first wall 21a can also be the bottom wall of the housing 211 arranged opposite to the end cap 212, or it can be one of the multiple wall portions of the side wall of the housing 211.

[0135] The thickness direction of the first wall 21a is parallel to the first direction X, and the thickness direction of the second wall 21b is parallel to the second direction Y. That is to say, the thickness directions of the first wall 21a and the second wall 21b are perpendicular to each other. Correspondingly, the thickness direction of the third wall 21c is also parallel to the second direction Y.

[0136] Of course, it is understandable that the outer casing 21 is not limited to the structure described above. The outer casing 21 can also be other structures. For example, the outer casing 21 can include a housing 211 and two end caps 212. The housing 211 is a hollow structure with openings 2111 formed on both opposite sides. One end cap 212 is fitted onto one opening 2111 of the housing 211 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 25 and the electrolyte. That is, the housing 211 has openings 2111 on both opposite sides, and the two end caps 212 are fitted onto both sides of the housing 211 to close the corresponding openings 2111.

[0137] In this embodiment, the electrode assembly 25 includes a main body 251, a first tab 252, and a second tab 253. The main body 251 is the main component of the electrode assembly 25 for chemical reactions to occur inside the battery cell 20. The first tab 252 and the second tab 253 have opposite polarities, that is, the first tab 252 and the second tab 253 are the positive tab and the negative tab of the electrode assembly 25, respectively, or the first tab 252 and the second tab 253 are the negative tab and the positive tab of the electrode assembly 25, respectively. The first tab 252 and the second tab 253 are both connected to the main body 251 and are spaced apart.

[0138] The main body 251 of the electrode assembly 25 includes a first electrode 2511, a second electrode 2512, and a separator 2513. The first electrode 2511 and the second electrode 2512 have opposite polarities, that is, the first electrode 2511 and the second electrode 2512 are respectively the positive electrode and the negative electrode of the electrode assembly 25, or the first electrode 2511 and the second electrode 2512 are respectively the negative electrode and the positive electrode of the electrode assembly 25. Correspondingly, the first tab 252 is connected to the first electrode 2511, and the second tab 253 is connected to the second electrode 2512. Optionally, the structure of the main body 251 of the electrode assembly 25 can be various. The main body 251 of the electrode assembly 25 can be a wound structure formed by winding the first electrode 2511, the second electrode 2512 and the separator 2513, or it can be a stacked structure formed by alternately stacking the first electrode 2511, the second electrode 2512 and the separator 2513. The separator 2513 is disposed between the first electrode 2511 and the second electrode 2512 to insulate and isolate the first electrode 2511 and the second electrode 2512.

[0139] For example, the separator 2513 is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0140] In the embodiments of this application, see Figure 4 and Figure 5 As shown, the first electrode 252 and the second electrode 253 are respectively connected to the two ends of the main body 251 in the second direction Y. Of course, in other embodiments, the first electrode 252 and the second electrode 253 may also be connected to the same end of the main body 251 in the second direction Y.

[0141] For example, the first electrode tab 252 is connected to the end of the first electrode 2511 near the second wall 21b in the second direction Y, and the second electrode tab 253 is connected to the end of the second electrode 2512 near the third wall 21c in the second direction Y.

[0142] The first tab 252 of the electrode assembly 25 is a multilayer metal foil structure connected to one end of the first electrode 2511 in the second direction Y, that is, the first tab 252 includes a plurality of first tab pieces 252a stacked together. Correspondingly, the second tab 253 of the electrode assembly 25 is also a multilayer metal foil structure connected to one end of the second electrode 2512 in the second direction Y, that is, the second tab 253 includes a plurality of second tab pieces 253a stacked together. It should be noted that the first tab 252a and the first electrode 2511 can be separate structures. For example, the first current collector of the first tab 252a and the first electrode 2511 can be welded together. Of course, the first tab 252a and the first electrode 2511 can also be integrally formed. For example, the first current collector of the first tab 252a and the first electrode 2511 can be formed by integrally cutting the same metal foil to form the first tab 252a and the first current collector. Similarly, the second tab 253a and the second electrode 2512 can be separate structures. For example, the second current collector of the second tab 253a and the second electrode 2512 can be welded together. Of course, the second tab 253a and the second electrode 2512 can also be integrally formed. For example, the second current collector of the second tab 253a and the second electrode 2512 can be formed by integrally cutting the same metal foil to form the second tab 253a and the second current collector.

[0143] In some embodiments, combined with Figure 10 and Figure 11 As shown, the main body 251 of the electrode assembly 25 includes a plurality of first electrode plates 2511, a plurality of second electrode plates 2512 and a plurality of spacers 2513. The first electrode plates 2511 and the second electrode plates 2512 are stacked and alternately arranged along the third direction Z. That is to say, the electrode assembly 25 is a stacked structure.

[0144] The first electrode 2511 includes a first current collector and a first active material layer disposed on at least one side of the first current collector. The first tab 252a is connected to the end of the first current collector in the second direction Y near the second wall 21b. The second electrode 2512 includes a second current collector and a second active material layer disposed on at least one side of the second current collector. The second tab 253a is connected to the end of the second current collector in the second direction Y near the third wall 21c.

[0145] It should be noted that, in the embodiments of this application, the first current collector of the first electrode tab 252a and the first electrode 2511 is a structure formed by integrally cutting the same metal foil to form the first electrode tab 252a and the first current collector, that is, the first electrode tab 252a and the first electrode 2511 are integrally formed, and multiple first electrode tabs 252a are stacked to form the first electrode tab 252. Similarly, the second current collector of the second electrode tab 253a and the second electrode 2512 is a structure formed by integrally cutting the same metal foil to form the second electrode tab 253a and the second current collector, that is, the second electrode tab 253a and the second electrode 2512 are integrally formed, and multiple second electrode tabs 253a are stacked to form the second electrode tab 253.

[0146] Optionally, the electrode assembly 25 housed within the housing 21 can be one or more. For example, in... Figure 4 and Figure 7 In this embodiment, the outer casing 21 of the battery cell 20 contains two electrode assemblies 25, which are stacked along the third direction Z. Of course, in other embodiments, the number of electrode assemblies 25 contained in the outer casing 21 of the battery cell 20 can be three, four, five or six, etc.

[0147] In this embodiment, the first electrode terminal 22 serves as the first tab 252 of the electrode assembly 25, acting as the output or input electrode of the battery cell 20, thereby enabling the output or input of electrical energy from the battery cell 20.

[0148] The first electrode terminal 22 is disposed in the first electrode lead-out hole 2121 of the first wall 21a and is insulatedly mounted on the first wall 21a. That is to say, there is no electrical connection between the first electrode terminal 22 and the first wall 21a of the outer casing 21. It should be noted that the first electrode lead-out hole 2121 is a structure that penetrates the first wall 21a along the first direction X.

[0149] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may also include a second electrode terminal 26, which is electrically connected to the second tab 253 of the electrode assembly 25, so that the second electrode terminal 26 and the first electrode terminal 22 can cooperate to input or output electrical energy of the battery cell 20.

[0150] For example, see Figure 4As shown, the second electrode terminal 26 is also disposed on the first wall 21a, and the second electrode terminal 26 and the first electrode terminal 22 are arranged at intervals along the second direction Y. Correspondingly, the first wall 21a is provided with a second electrode lead-out hole, which penetrates the first wall 21a along the first direction X. The second electrode terminal 26 is disposed in the second electrode lead-out hole of the first wall 21a and is insulatedly mounted on the first wall 21a. That is to say, no electrical connection is formed between the second electrode terminal 26 and the first wall 21a of the outer casing 21.

[0151] In this embodiment, the first current collector 23 serves to connect the first electrode terminal 22 and the first tab 252 to achieve an electrical connection between the first electrode terminal 22 and the first tab 252.

[0152] The connection structure between the first current collector 23 and the first electrode terminal 22, as well as between the first current collector 23 and the first electrode tab 252, can be various, such as welding connection or abutment connection.

[0153] For example, the material of the first current collector 23 can be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0154] See Figure 5 and Figure 6 As shown, the first current collector 23 includes a first current collector 231 and a second current collector 232 connected to each other. The first current collector 231 is located between the main body 251 and the first wall 21a and is connected to the first electrode terminal 22. The second current collector 232 extends from the first current collector 231 to the space between the main body 251 and the second wall 21b. That is, the first current collector 23 is an "L"-shaped structure formed by the interconnection of the first current collector 231 and the second current collector 232. The first current collector 231 is located between the first wall 21a and the main body 251, and the thickness direction of the first current collector 231 is parallel to the first direction X. The second current collector 232 is located between the second wall 21b and the main body 251, and the thickness direction of the second current collector 232 is parallel to the second direction Y.

[0155] Optionally, the first current collecting part 231 and the second current collecting part 232 of the first current collecting member 23 can be integrally formed, for example, the first current collecting part 231 and the second current collecting part 232 can be formed by stamping and bending. Of course, the first current collecting part 231 and the second current collecting part 232 of the first current collecting member 23 can also be a separate structure, for example, the first current collecting part 231 and the second current collecting part 232 can be welded together or snapped together.

[0156] Combination Figure 4 , Figure 8 and Figure 11As shown, the first tab 252 includes a first connecting portion 2523 located on the side of the second current collector 232 away from the main body 251 in the second direction Y. The first connecting portion 2523 is connected to the second current collector 232. That is, the first tab 252 is a structure that bends around the second current collector 232 and partially folds to the side of the second current collector 232 away from the main body 251, so that the first connecting portion 2523 is the part of the first tab 252 located on the side of the second current collector 232 away from the main body 251, and this part is connected to the second current collector 232, for example, by welding or abutting.

[0157] For example, in Figure 9 In the first connection portion 2523, the second current collector portion 232 is welded together to form a first solder mark portion 40. Along the second direction Y, at least a portion of the first solder mark portion 40 is a structure that extends from the surface of the first connection portion 2523 away from the main body portion 251 into the second current collector portion 232, so as to realize that the first solder mark portion 40 connects the first connection portion 2523 and the second current collector portion 232, thereby making the first connection portion 2523 and the second current collector portion 232 welded together from the side of the first connection portion 2523 away from the main body portion 251 to form the first solder mark portion 40.

[0158] The first electrode tab 252 is a structure that bends around the second current collector 232. That is, the first electrode tab 252 starts from the end of the main body 251 near the second wall 21b and bends around the second current collector 232, so that the first electrode tab 252 bends to form a first root 2521, a first bend 2522 and a first connecting part 2523 connected in sequence. The first root 2521 is connected to the end of the main body 251 near the second wall 21b, and part of the first root 2521 is located between the second current collector 232 and the main body 251. The first bend 2522 is located on one side of the second current collector 232 in the third direction Z. The first connecting part 2523 is located on the side of the second current collector 232 away from the main body 251.

[0159] The first connecting portion 2523 has a first extension region 2523a that extends beyond the end of the second collector portion 232 away from the first collector portion 231 in the first direction X. That is, in the first direction X, the end of the first connecting portion 2523 away from the first wall 21a is further away from the first wall 21a than the end of the second collector portion 232 away from the first wall 21a, such that the first connecting portion 2523 has a portion extending beyond the end of the second collector portion 232 away from the first collector portion 231 in the first direction X, and this portion is the first... The first extension region 2523a of the connecting portion 2523, and the orthographic projection of the first extension region 2523a and the orthographic projection of the first current collector 231 do not overlap in the projection plane perpendicular to the second direction Y. That is, in the projection plane perpendicular to the second direction Y, the orthographic projection of the first extension region 2523a and the orthographic projection of the first current collector 231 do not have overlapping areas. Correspondingly, the first extension region 2523a is the part of the first connecting portion 2523 that is not blocked by the second current collector 232 in the second direction Y.

[0160] In the embodiments of this application, combined with Figure 4 , Figure 9 , Figure 10 and Figure 12 As shown, the battery cell 20 also includes a first insulating member 24, which includes an integrally formed first insulating portion 241 and a second insulating portion 242. At least a portion of the first insulating portion 241 is located between the main body portion 251 and the first extension region 2523a in the second direction Y. The second insulating portion 242 is disposed on the side of the main body portion 251 facing away from the first wall 21a in the first direction X. That is, the first insulating member 24 has a structure in which the first insulating portion 241 and the second insulating portion 242 are bent to form an interconnected structure. Furthermore, the first insulating portion 241 is located between the first extension region 2523a and the main body portion 251 in the second direction Y, so that the first insulating portion 241 can insulate and isolate the portion of the first connection portion 2523 of the main body portion 251 and the first tab 252 that is not blocked by the second current collector 232. The second insulating portion 242 is located between the side of the main body portion 251 facing away from the first wall 21a in the first direction X and the outer shell 21, so that the connection position of the first insulating portion 241 and the second insulating portion 242 is located at the corner of the main body portion 251.

[0161] For example, the material of the first insulating member 24 can be various, such as rubber, plastic or silicone.

[0162] Optionally, the first insulating member 24 is bonded to the electrode assembly 25, that is, an adhesive layer is provided on the side of the first insulating member 24 facing the electrode assembly 25, and the adhesive layer is bonded to the electrode assembly 25. Correspondingly, the first insulating member 24 can be tape or adhesive paper, etc.

[0163] In some embodiments, see Figure 4 and Figure 5 As shown, the battery cell 20 may also include a second current collector 27, which is disposed inside the housing 21. The second current collector 27 serves to connect the second electrode terminal 26 and the second tab 253 to realize the electrical connection between the second electrode terminal 26 and the second tab 253.

[0164] The connection structure between the second current collector 27 and the second electrode terminal 26, as well as between the second current collector 27 and the second electrode tab 253, can be various, such as welding connection or abutment connection.

[0165] For example, the material of the second current collector 27 can also be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0166] It should be noted that, see Figure 4 , Figure 5 , Figure 7 , Figure 10 and Figure 11 As shown, the second electrode tab 253 can have the same structure as the first electrode tab 252. Correspondingly, the second current collector 27 can also have the same structure as the first current collector 23. For example, the second current collector 27 includes a third current collector 271 and a fourth current collector 272 connected to each other. The third current collector 271 is located between the main body 251 and the first wall 21a and is connected to the second electrode terminal 26. The fourth current collector 272 is located between the main body 251 and the third wall 21c and is connected to the second electrode tab 253. Similarly, a second insulating member 29 can also be correspondingly provided between the second electrode tab 253 and the main body 251. The second insulating member 29 serves to insulate and separate the second electrode tab 253 from the main body 251, thereby reducing the risk of the second electrode tab 253 being inserted upside down into the main body 251 and the second electrode tab 253 overlapping with the main body 251. Correspondingly, the second insulating member 29 can also have the same structure as the first insulating member 24.

[0167] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may also include a pressure relief component 28, which is disposed on the housing 21 and is used to release the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0168] For example, the pressure relief component 28 is disposed on the end cap 212 of the housing 21. Of course, in other embodiments, the pressure relief component 28 may also be disposed on the housing 211 of the housing 21. Similarly, the pressure relief component 28 and the housing 21 may be integrally formed or separate. If the pressure relief component 28 and the housing 21 are separate, the pressure relief component 28 may be connected to the housing 21 by welding or other means. Correspondingly, the pressure relief component 28 may be a component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve, or safety valve. If the pressure relief component 28 and the housing 21 are integrally formed, the pressure relief component 28 is a region on the housing 21 with a weak structure, such as a region on the housing 21 with a groove.

[0169] In this embodiment, the first electrode terminal 22 is disposed on the first wall 21a of the housing 21, and the first electrode tab 252 is connected to the end near the second wall 21b. This arrangement allows the first electrode terminal 22 and the first electrode tab 252 to be located on different sides of the main body 251, which helps to reduce interference between them. It also facilitates configuring the first electrode tab 252 with a first connecting portion 2523 located on the side of the second current collector 232 facing away from the main body 251 and connected to the second current collector 232. This results in the first electrode tab 252 being bent and at least partially extending to the second current collector 232 facing away from the main body 251. The structure on one side of the body 251 reduces the phenomenon of the second current collector 232 pressing down on the first electrode tab 252 during use, thereby reducing the risk of damage to the first electrode tab 252. It also allows the second current collector 232 and the first electrode tab 252 to share space in the second direction Y, improving the internal space utilization of the battery cell 20. The electrode assembly 25 is further provided with a first insulating member 24, which includes an integrally formed first insulating portion 241 and a second insulating portion 242. At least a portion of the first insulating portion 241 is located between the body 251 and the first extension region 2523a in the second direction Y, and the second insulating portion... Part 242 is disposed on the side of the main body 251 facing away from the first wall 21a in the first direction X, so that the first insulating member 24 has a structure in which the first insulating part 241 and the second insulating part 242 are formed by bending. This results in at least a portion of the edge of the end face of the main body 251 facing the second wall 21b in the first direction X away from the first wall 21a being covered by the first insulating member 24. Furthermore, a portion of the first insulating member 24 extends between the main body 251 and the first extension area 2523a and partially extends to the side of the main body 251 facing away from the first wall 21a. The battery cell 20 with this structure can improve... The first insulating member 24 is more securely mounted on the electrode assembly 25. On the other hand, it can improve the insulation effect of the first insulating member 24 on the first extension area 2523a and the main body 251. This reduces the pressure of the second current collector 232 on the first tab 252, while also alleviating the phenomenon that the first tab 252 is inserted backward into the main body 251 along the second direction Y. It also reduces the phenomenon that the first tab 252 and the main body 251 overlap on the side away from the first wall 21a in the first direction X. This effectively reduces the risk of internal short circuits in the battery cell 20 during use, thereby improving the reliability of the battery cell 20.

[0170] According to some embodiments of this application, in conjunction with Figure 4 , Figure 5 , Figure 9 and Figure 10As shown, a portion of the first insulating portion 241 is located between the main body portion 251 and the second current collector portion 232. That is, the first insulating portion 241 extends from one end near the first wall 21a in the first direction X to between the main body portion 251 and the second current collector portion 232, such that the first insulating portion 241 and the second current collector portion 232 have overlapping areas in the second direction Y.

[0171] In this embodiment, by configuring a portion of the first insulating portion 241 as a structure located between the main body portion 251 and the second current collector 232, the first insulating portion 241 extends in the first direction X to the space between the main body portion 251 and the second current collector 232. This structure in the battery cell 20 further reinforces the first insulating portion 241 through the main body portion 251 and the second current collector 232, improving the stability of the first insulating portion 241 disposed between the main body portion 251 and the first extension region 2523a, and helping to alleviate the stress on the first insulating portion 241 during use. During the process, the phenomenon of lifting or displacement occurs. On the other hand, the first insulating part 241 and the second current collector 232 have overlapping areas in the second direction Y. This allows the first insulating part 241 to better separate the first extension area 2523a of the first connecting part 2523 that extends beyond the second current collector 232 and is far away from the first current collector 231. This further enhances the insulation effect of the first insulating member 24 on the first extension area 2523a and the main body 251, thereby further reducing the risk of the first electrode 252 being inserted backward into the main body 251 along the second direction Y.

[0172] According to some embodiments of this application, see Figure 10 As shown, along the second direction Y, the size of the portion of the second insulating portion 242 that protrudes from the side of the first insulating portion 241 facing the main body portion 251 is 2mm-50mm.

[0173] Among them, Figure 10 In the second insulating part 242, the dimension of the portion of the second insulating part 242 that protrudes from the side of the first insulating part 241 facing the main body part 251 in the second direction Y is W, that is, 2mm≤W≤50mm.

[0174] For example, the size W of the portion of the second insulating portion 242 that protrudes in the second direction Y from the side of the first insulating portion 241 facing the main body portion 251 can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, or 50mm, etc.

[0175] In this embodiment, on the one hand, the length of the portion of the second insulating part 242 protruding along the second direction Y from the side of the first insulating part 241 facing the main body 251 is set to be greater than or equal to 2 mm, so as to increase the area covered by the second insulating part 242 on the side of the main body 251 away from the first wall 21a. This can further reduce the risk of the first electrode tab 252 and the side of the main body 251 away from the first wall 21a overlapping each other, and can improve the stability of the second insulating part 242 disposed on the side of the main body 251 away from the first wall 21a. On the other hand, the length of the portion of the second insulating part 242 protruding along the second direction Y from the side of the first insulating part 241 facing the main body 251 is set to be less than or equal to 50 mm, so as to reduce the excessive waste of the length of the second insulating part 242 and the excessive space occupied, thereby saving the manufacturing cost of the battery cell 20 and improving the internal space utilization of the battery cell 20.

[0176] According to some embodiments of this application, in conjunction with Figure 10 and Figure 12 As shown, the second insulating part 242 is connected to the surface of the main body part 251 that is away from the first wall 21a in the first direction X.

[0177] For example, the second insulating portion 242 is bonded to the surface of the main body portion 251 that is away from the first wall 21a in the first direction X.

[0178] In this embodiment, by connecting the second insulating part 242 to the surface of the main body 251 facing away from the first wall 21a in the first direction X, the stability and reliability of the second insulating part 242 disposed on the side of the main body 251 facing away from the first wall 21a are improved. This can alleviate the phenomenon of the second insulating part 242 tilting or shifting during use, and further reduce the risk of the first electrode tab 252 overlapping with the side of the main body 251 facing away from the first wall 21a.

[0179] According to some embodiments of this application, in conjunction with Figure 8 and Figure 11 As shown, the first tab 252 bends around the second current collector 232 to form a first root portion 2521, a first bend portion 2522, and a first connecting portion 2523 connected in sequence, with the first root portion 2521 connected to the main body portion 251. The first bend portion 2522 is located on one side of the second current collector 232 in the third direction Z, and at least a portion of the second current collector 232 is located between the first root portion 2521 and the first connecting portion 2523 in the second direction Y and is connected to the first connecting portion 2523. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0180] The first bent portion 2522 of the first electrode tab 252 is the part of the first electrode tab 252 bent and connected between the first connecting portion 2523 and the first root portion 2521. The first connecting portion 2523 is located on the side of the second current collector 232 away from the main body portion 251 in the second direction Y and is arranged at intervals with the first root portion 2521 along the second direction Y. The portion of the first root portion 2521 is located between the first current collector 231 and the main body portion 251.

[0181] The first bending portion 2522 is located on one side of the second current collector 232 in the third direction Z, and at least a portion of the second current collector 232 is located between the first root portion 2521 and the first connecting portion 2523 in the second direction Y. That is, the first bending portion 2522 and the second current collector 232 formed by bending the first tab 252 are arranged in the third direction Z, and at least a portion of the second current collector 232 is sandwiched between the first connecting portion 2523 and the first root portion 2521 in the second direction Y, so that the first connecting portion 2523, the second current collector 232 and the first root portion 2521 are arranged in sequence in the second direction Y.

[0182] It should be noted that in the embodiment where the first electrode tab 252 includes a plurality of first electrode tab pieces 252a, each first electrode tab piece 252a is a structure that is bent around the second current collecting portion 232, and the portion of each first electrode tab piece 252a located in the first root portion 2521 is connected to the corresponding first electrode piece 2511, and the portion of each first electrode tab piece 252a located in the first bending portion 2522 is a bent structure, and the portion of each first electrode tab piece 252a located in the first bending portion 2522 connects the portion of the first electrode tab piece 252a located in the first connecting portion 2523 and the portion located in the first root portion 2521.

[0183] In this embodiment, by setting the first bending portion 2522 to one side of the second current collector 232 in the third direction Z, and setting at least a portion of the second current collector 232 to be located between the first root portion 2521 and the first connecting portion 2523 in the second direction Y, the first tab 252 forms a first connecting portion 2523 located on the side of the second current collector 232 away from the main body portion 251. The battery cell 20 with this structure can reduce the assembly difficulty of the second current collector 232 and the first connecting portion 2523 and increase the connection area between the second current collector 232 and the first connecting portion 2523. On the other hand, it can realize that the first tab 252 and the second current collector 232 share part of the space in the second direction Y and the third direction Z, which is beneficial to improving the internal space utilization of the battery cell 20.

[0184] In some embodiments, combined with Figure 10 , Figure 11 and Figure 12 As shown, at least a portion of the first insulating portion 241 is located between the first extension region 2523a and the first root portion 2521 and is connected to the surface of the first root portion 2521 facing the first extension region 2523a.

[0185] For example, the first insulating portion 241 is bonded to the surface of the first root portion 2521 facing the first extension region 2523a.

[0186] In this embodiment, by configuring the first insulating portion 241 to be at least partially located between the first extension region 2523a and the first root portion 2521 and connected to the first root portion 2521, on the one hand, while realizing the separation of the first insulating portion 241 from the first extension region 2523a and the main body portion 251, the difficulty of setting the first insulating portion 241 between the main body portion 251 and the first extension region 2523a can be reduced, and the first insulating portion 241 can also play a separating role between the first extension region 2523a and the first root portion 2521. On the other hand, the stability of the first insulating portion 241 set between the main body portion 251 and the first extension region 2523a can be improved, which is beneficial to alleviate the phenomenon of the first insulating portion 241 tilting or shifting during use.

[0187] According to some embodiments of this application, in conjunction with Figure 10 , Figure 11 and Figure 12 As shown, the first insulating member 24 may also include a third insulating part 243. Along the third direction Z, the third insulating part 243 is disposed on one side of the main body part 251 and connected to the end of the first insulating part 241 away from the first bent part 2522.

[0188] The third insulating part 243 is disposed on one side of the main body 251 and connected to the end of the first insulating part 241 away from the first bent part 2522. That is, the first bent part 2522 is located at one end of the first insulating part 241 in the third direction Z, and the third insulating part 243 is connected to the other end of the first insulating part 241 in the third direction Z. The third insulating part 243 is a structure disposed on the surface of the main body 251 on one side in the third direction Z.

[0189] In this embodiment, the first insulating member 24 further includes a third insulating portion 243 disposed on one side of the main body portion 251 in the third direction Z, and the third insulating portion 243 is connected to the end of the first insulating portion 241 away from the first bent portion 2522. The battery cell 20 with this structure can, on the one hand, achieve coverage of at least a portion of the main body portion 251 in the third direction Z near the third insulating portion 243 by the first insulating member 24, which helps to reduce the wind resistance caused by the first tab 252 extending to the side of the main body portion 251 in the third direction Z near the third insulating portion 243 and overlapping with the main body portion 251. Furthermore, it enables the structure in which at least a portion of the edge of the end face of the main body 251 facing the second wall 21b in the third direction Z, near the end of the third insulating part 243, is covered by the first insulating member 24. This helps to further reduce the phenomenon of the first electrode tab 252 being inserted into the main body 251, thereby further reducing the risk of internal short circuits in the battery cell 20 during use. On the other hand, it can further increase the contact area between the first insulating member 24 and the electrode assembly 25, thereby further improving the assembly stability and reliability between the first insulating member 24 and the electrode assembly 25.

[0190] In some embodiments, see Figure 10 and Figure 12 As shown, the third insulating part 243 is connected to the second insulating part 242.

[0191] The third insulating part 243 is the portion of the first insulating member 24 disposed on one side of the main body 251 in the third direction Z. Correspondingly, one end of the third insulating part 243 in the second direction Y is connected to the first insulating part 241, and one end of the third insulating part 243 in the first direction X is connected to the second insulating part 242, so that in the first insulating member 24, the first insulating part 241 and the second insulating part 242 are interconnected, and both the first insulating part 241 and the second insulating part 242 are connected to the third insulating part 243.

[0192] In this embodiment, by further configuring the third insulating part 243 and the second insulating part 242 as interconnected structures, the structural stability of the first insulating member 24 as a whole disposed on the electrode assembly 25 can be further improved, thereby reducing the phenomenon of the first insulating member 24 falling off during use. It can also further improve the covering effect of the first insulating member 24 on the main body 251, thereby further reducing the phenomenon of the first tab 252 being inserted into the main body 251 or overlapping with the main body 251, which is beneficial to further reduce the risk of internal short circuit in the battery cell 20 during use.

[0193] In some embodiments, see Figure 12 As shown, the first insulating part 241, the second insulating part 242 and the third insulating part 243 are integrally formed, that is, the first insulating member 24 is a structure formed by bending to form the first insulating part 241, the second insulating part 242 and the third insulating part 243 that are connected to each other.

[0194] In this embodiment, by setting the first insulating portion 241, the second insulating portion 242, and the third insulating portion 243 of the first insulating member 24 as an integrally formed structure, the first insulating portion 241, the second insulating portion 242, and the third insulating portion 243 are integrally formed by bending the first insulating member 24. The first insulating member 24 with this structure can improve the overall structural strength of the first insulating member 24 and reduce the assembly difficulty between the first insulating member 24 and the electrode assembly 25. On the other hand, it can further improve the effect of the first insulating member 24 in separating the first electrode tab 252 and the main body portion 251, which is conducive to further reducing the risk of short circuit between the first electrode tab 252 and the main body portion 251 during use.

[0195] In some embodiments, combined with Figure 10 and Figure 12 As shown, the third insulating part 243 is connected to the surface of the main body part 251 on the side in the third direction Z.

[0196] For example, the third insulating part 243 is bonded to the surface of the main body part 251 on the side facing the third direction Z.

[0197] In this embodiment, by connecting the third insulating part 243 to the surface of the main body 251 on the third direction Z side, the stability and reliability of the third insulating part 243 being disposed on the side of the main body 251 on the third direction Z side can be improved, thereby alleviating the phenomenon of the third insulating part 243 tilting or shifting during use, and improving the assembly stability between the first insulating member 24 and the electrode assembly 25.

[0198] According to some embodiments of this application, see Figure 4 , Figure 7 , Figure 8 and Figure 9 As shown, the battery cell 20 may include two electrode assemblies 25 stacked along the third direction Z. The first connecting portions 2523 of the first tabs 252 of the two electrode assemblies 25 are both connected to the same second current collector 232. Along the third direction Z, the first bending portions 2522 of the first tabs 252 of the two electrode assemblies 25 are respectively located on both sides of the second current collector 232.

[0199] In this configuration, the first connecting portion 2523 of the first tab 252 of the two electrode assemblies 25 are both connected to the same second current collector 232. That is, the first tab 252 of the two electrode assemblies 25 are both connected to the second current collector 232 of the same first current collector 23, so that the two electrode assemblies 25 share a first current collector 23.

[0200] Along the third direction Z, the first bends 2522 of the first tabs 252 of the two electrode assemblies 25 are respectively located on both sides of the second current collector 232. That is, the first tabs 252 of the two electrode assemblies 25 are both bent around the second current collector 232, but the bending directions of the first tabs 252 of the two electrode assemblies 25 are opposite, so that the first connecting portion 2523 of the first tab 252 of one electrode assembly 25 is a structure that extends from one end connected to the first bend 2522 along the third direction Z toward the first connecting portion 2523 of the first tab 252 of the other electrode assembly 25. That is, the first tabs 252 of the two electrode assemblies 25 are respectively bent around the second current collector 232 on both sides in the third direction Z to the side of the second current collector 232 away from the main body 251, so that the second current collector 232 is a structure located between the first bends 2522 of the first tabs 252 of the two electrode assemblies 25 in the third direction Z.

[0201] In this embodiment, by setting the first bent portions 2522 of the first tabs 252 of the two electrode assemblies 25 to be located on both sides of the second current collector 232 in the third direction Z, and the first connecting portions 2523 of the first tabs 252 of the two electrode assemblies 25 to be connected to the same second current collector 232, the first tabs 252 of the two electrode assemblies 25 are bent around the same second current collector 232 in opposite directions. The battery cell 20 with this structure can optimize the internal space layout of the battery cell 20, which is conducive to improving the internal space utilization of the battery cell 20, and can reduce the assembly difficulty of the battery cell 20 and save the manufacturing cost of the battery cell 20. On the other hand, the second current collector 232 can also cover the gap between the main body portions 251 of the two electrode assemblies 25 to a certain extent, which helps to alleviate the risk of short circuit inside the battery cell 20 caused by the first connecting portions 2523 of the first tabs 252 being inserted into the gap between the main body portions 251 of the two electrode assemblies 25.

[0202] In some embodiments, see Figure 4 As shown, the battery cell 20 may include two first insulating members 24, each of which is disposed on an electrode assembly 25. That is, the first insulating member 24 and the electrode assembly 25 are disposed in a one-to-one correspondence.

[0203] Of course, in other embodiments, the battery cell 20 may also be provided with only one first insulating member 24, so that the two electrode assemblies 25 share one first insulating member 24. In this embodiment, the first insulating member 24 includes only a first insulating part 241 and a second insulating part 242.

[0204] In this embodiment, by providing a first insulating member 24 in the housing 21 for each electrode assembly 25, it is beneficial to reduce the assembly difficulty between the first insulating member 24 and the electrode assembly 25, and to improve the effect of the first insulating member 24 in separating the first tab 252 and the main body 251 of the corresponding electrode assembly 25.

[0205] According to some embodiments of this application, refer to Figure 4 , Figure 10 and Figure 11 Please refer to further details. Figure 13 , Figure 13This is a schematic diagram illustrating the connection between the first electrode 2511 and the first electrode tab 252a provided in some embodiments of this application. The electrode assembly 25 has a stacked structure. The main body 251 includes multiple first electrode 2511s with the same polarity, which are stacked along the third direction Z. The first electrode tab 252 includes multiple stacked first electrode tabs 252a. Each first electrode 2511 has a first electrode tab 252a connected to one end near the second wall 21b in the second direction Y. The first electrode 2511 and the first electrode tab 252a are integrally formed, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Along the first direction X, at least one end of the first electrode tab 252a is flush with one end of the corresponding first electrode 2511.

[0206] The electrode assembly 25 has a stacked structure. Correspondingly, the main body 251 of the electrode assembly 25 includes a plurality of first electrode plates 2511 and a plurality of second electrode plates 2512, and the first electrode plates 2511 and the second electrode plates 2512 are arranged alternately and stacked along the third direction Z.

[0207] The first electrode tab 252 includes a plurality of first electrode tabs 252a stacked together. Each first electrode tab 2511 is connected to a first electrode tab 252a at one end in the second direction Y near the second wall 21b. That is, the first electrode tab 252 is a multi-layer foil structure formed by stacking a plurality of first electrode tabs 252a, and each first electrode tab 2511 is connected to at least one first electrode tab 252a. Correspondingly, the second electrode tab 253 also includes a plurality of second electrode tabs 253a stacked together, and each second electrode tab is connected to a second electrode tab 253a at one end in the second direction Y near the third wall 21c.

[0208] The first electrode 2511 and the first electrode tab 252a are integrally formed, that is, the first current collector of the first electrode tab 252a and the first electrode 2511 is a structure formed by integral cutting of the same metal foil. Correspondingly, the area of ​​the metal foil coated with the coating layer is the first electrode 2511, and the area without the coating layer is the first electrode tab 252a.

[0209] Along the first direction X, at least one end of the first tab 252a is flush with one end of the corresponding first electrode 2511. That is, the first tab 252a can be a structure in which one end in the first direction X is flush with one end of the first current collector of the corresponding first electrode 2511, or it can be a structure in which both ends of the first tab 252a in the first direction X are respectively flush with both ends of the first current collector of the corresponding first electrode 2511.

[0210] It should be noted that the fact that one end of the first electrode tab 252a in the first direction X is flush with the same end of the corresponding first electrode tab 2511 in the first direction X means that the distance between one end of the first electrode tab 252a in the first direction X and the same end of the first current collector of the corresponding first electrode tab 2511 in the first direction X is less than or equal to 2mm.

[0211] In this embodiment, by setting the electrode assembly 25 as a stacked structure, it is beneficial to improve the space utilization of the electrode assembly 25, thereby increasing the energy density of the battery cell 20. Specifically, by setting the first electrode 2511 and the first electrode tab 252a as an integrally formed structure, and setting at least one end of the first electrode tab 252a in the first direction X and one end of the corresponding first electrode 2511 as flush with each other, it is convenient to increase the width of the first electrode tab 252a in the first direction X to improve the current carrying capacity of the first electrode tab 252a. On the other hand, it is convenient to uniformly cut the first electrode tab 252a and the first electrode 2511 during the processing and forming of the first electrode tab 252a and the first electrode 2511, at least eliminating the need for a secondary cutting process at one end of the first electrode tab 252a in the first direction X. This helps to reduce the forming difficulty of the first electrode tab 252a and the first electrode 2511, and can optimize the production process and production cycle of the electrode assembly 25.

[0212] In some embodiments, combined with Figure 4 , Figure 6 , Figure 11 and Figure 13 As shown, along the first direction X, the end of the first tab 252a near the first wall 21a is flush with the end of the corresponding first electrode 2511 near the first wall 21a. That is, in the first direction X, the distance between the end of the first tab 252a near the first wall 21a and the end of the first current collector of the corresponding first electrode 2511 near the first wall 21a is less than or equal to 2 mm.

[0213] In this embodiment, by setting the end of the first tab 252a near the first wall 21a in the first direction X to be flush with the end of the corresponding first electrode 2511 near the first wall 21a, the first tab 252a is arranged such that the end of the first tab 252a near the first current collector 231 in the first direction X is flush with the end of the corresponding first electrode 2511 near the first wall 21a. This increases the area of ​​the first connecting portion 2523 of the first tab 252 overlapping with the second current collector 232 in the second direction Y, which is beneficial to increasing the connection area between the first connecting portion 2523 and the second current collector 232, thereby improving the current flow effect between the first tab 252 and the second current collector 232.

[0214] In some embodiments, combined with Figure 10 , Figure 11 and Figure 13 As shown, along the first direction X, the end of the first electrode tab 252a away from the first wall 21a is flush with the end of the corresponding first electrode 2511 away from the first wall 21a. That is, in the first direction X, the distance between the end of the first electrode tab 252a away from the first wall 21a and the end of the first current collector of the corresponding first electrode 2511 away from the first wall 21a is less than or equal to 2 mm.

[0215] In this embodiment, by further configuring the end of the first electrode tab 252a away from the first wall 21a in the first direction X as flush with the end of the corresponding first electrode 2511 away from the first wall 21a, the two ends of the first electrode tab 252a in the first direction X are respectively flush with the two ends of the corresponding first electrode 2511. This can further increase the width of the first electrode tab 252a in the first direction X, thereby further improving the current flow effect of the first electrode tab 252a. On the other hand, it can further facilitate the uniform cutting of the two ends of the first electrode tab 252a and the first electrode 2511 during the processing and forming of the first electrode tab 252a and the first electrode 2511, eliminating the need for a secondary cutting process of the two ends of the first electrode tab 252a in the first direction X. This helps to further reduce the forming difficulty of the first electrode tab 252a and the first electrode 2511, and can further optimize the production process and production cycle of the electrode assembly 25.

[0216] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 7 As shown, the outer casing 21 also has a third wall 21c, which is disposed opposite to the second wall 21b in the second direction Y, and the third wall 21c is connected to the first wall 21a. The battery cell 20 may also include a second electrode terminal 26 and a second current collector 27. The second electrode terminal 26 is disposed in the first wall 21a, and the second current collector 27 is disposed inside the outer casing 21. The second current collector 27 includes a third current collector 271 and a fourth current collector 272 connected to each other. The third current collector 271 is located between the main body 251 and the first wall 21a and is connected to the second electrode terminal 26. The fourth current collector 272 extends from the third current collector 271 to the space between the main body 251 and the third wall 21c. The electrode assembly 25 also includes a second tab 253, the polarity of which is opposite to that of the first tab 252. Along the second direction Y, the second tab 253 is connected to the end of the main body 251 facing the third wall 21c, and the second tab 253 is connected to the fourth current collector 272.

[0217] The first electrode terminal 22 and the second electrode terminal 26 are both disposed on the first wall 21a and arranged at intervals along the second direction Y. Correspondingly, the first current collecting part 231 of the first current collecting member 23 and the third current collecting part 271 of the second current collecting member 27 are both disposed between the main body 251 and the first wall 21a and arranged at intervals along the second direction Y. The second current collecting part 232 of the first current collecting member 23 and the fourth current collecting part 272 of the second current collecting member 27 are respectively located on both sides of the main body 251 in the second direction Y.

[0218] Along the second direction Y, the second electrode tab 253 is connected to one end of the main body 251 facing the third wall 21c. In other words, the electrode assembly 25 has a structure with electrodes at both ends in the second direction Y.

[0219] See Figure 4 , Figure 5 and Figure 7 As shown, the second tab 253 is bent around the fourth current collector 272. The second tab 253 includes a second connecting portion 2533 located on the side of the fourth current collector 272 away from the main body 251 in the second direction Y. The second connecting portion 2533 is connected to the fourth current collector 272, and the second connecting portion 2533 has a second extension region extending beyond the fourth current collector 272 and away from the third current collector 271 in the first direction X. The battery cell 20 may also include a second insulating member 29. At least a portion of the second insulating member 29 is disposed between the main body 251 and the second extension region to insulate and isolate the main body 251 and the second extension region.

[0220] The second electrode 253 is a structure in which the second electrode 253 bends around the fourth current collector 272 from the end of the main body 251 near the third wall 21c. The second electrode 253 is bent to form a second root 2531, a second bend 2532 and a second connecting part 2533 connected in sequence. The second root 2531 is connected to the end of the main body 251 near the third wall 21c, and part of the second root 2531 is located between the fourth current collector 272 and the main body 251. The second bend 2532 is located on one side of the fourth current collector 272 in the third direction Z. The second connecting part 2533 is located on the side of the fourth current collector 272 away from the main body 251.

[0221] For example, the material of the second insulating member 29 can be various, such as rubber, plastic or silicone.

[0222] In this embodiment, by setting the first tab 252 and the second tab 253 of opposite polarity in the electrode assembly 25 to be connected to the two ends of the main body 251 in the second direction Y, and by setting the second current collector 232 of the first current collector 23 and the fourth current collector 272 of the second current collector 27 to be located on both sides of the main body 251 in the second direction Y and connected to the first tab 252 and the second tab 253 respectively, on the one hand, the interference between the second current collector 232 and the fourth current collector 272 can be reduced, which is beneficial to reducing the assembly difficulty between the second current collector 232 and the first tab 252 and between the fourth current collector 272 and the second tab 253. On the other hand, while realizing the input or output of electrical energy of the battery cell 20, the overlapping phenomenon between the first tab 252 and the second tab 253 and between the second current collector 232 and the fourth current collector 272 can be reduced, which is beneficial to further reduce the risk of internal short circuit of the battery cell 20 during use.

[0223] According to some embodiments of this application, see Figure 4 As shown, the battery cell 20 may also include a separator 30, which is made of insulating material and has a receiving space 31. At least a portion of the electrode assembly 25 is located within the receiving space 31, and at least a portion of the second current collector 232 is located within the receiving space 31.

[0224] In this embodiment, the receiving space 31 of the separator 30 serves to accommodate at least a portion of the electrode assembly 25 and at least a portion of the second current collector 232, such that after the second current collector 232 and the first tab 252 of the electrode assembly 25 are assembled, the separator 30 covers the outside of the overall structure formed by the assembly of the second current collector 232 and the electrode assembly 25. Alternatively, in embodiments where the battery cell 20 includes a second current collector 27, which includes a third current collector 271 and a fourth current collector 272, at least a portion of the fourth current collector 272 is also accommodated within the receiving space 31. Correspondingly, after the second current collector 232 and the first tab 252 of the electrode assembly 25, and the fourth current collector 272 and the second tab 253 of the electrode assembly 25 are assembled, the separator 30 covers the outside of the overall structure formed by the assembly of the electrode assembly 25, the second current collector 232, and the fourth current collector 272.

[0225] For example, the separator 30 is an insulating film structure covering the outside of the electrode assembly 25, the second current collector 232 and the fourth current collector 272. Optionally, the material of the separator 30 can be plastic, rubber or silicone, etc.

[0226] In this embodiment, the battery cell 20 is further provided with an insulating separator 30, and at least a portion of the electrode assembly 25 and at least a portion of the second current collector 232 are located within the receiving space 31 of the separator 30, so that the separator 30 has a structure that covers at least a portion of the electrode assembly 25 and at least a portion of the second current collector 232. The battery cell 20 with this structure can, on the one hand, achieve the integration of the electrode assembly 25 and the first current collector 23 into an integral structure through the separator 30, which helps to reduce the assembly difficulty of the battery cell 20 and improve the overall structural stability between the electrode assembly 25 and the first current collector 23. On the other hand, the separator 30 can also play an insulating role between the electrode assembly 25 and the outer shell 21 and between the second current collector 232 and the outer shell 21, which helps to alleviate the overlap phenomenon between the electrode assembly 25 and the outer shell 21 and between the second current collector 232 and the outer shell 21, so as to further reduce the risk of internal short circuits in the battery cell 20 during use.

[0227] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 5 As shown, the housing 21 may include a housing 211 and an end cap 212. The housing 211 has an opening 2111 at at least one end in the first direction X. At least a portion of the electrode assembly 25 is housed within the housing 211. The end cap 212 closes the opening 2111. The end cap 212 is a first wall 21a. The housing 211 includes a second wall 21b.

[0228] The housing 211 includes an integrally formed bottom wall and a side wall. The side wall surrounds the bottom wall, and one end of the side wall in the first direction X is connected to the bottom wall, while the other end forms an opening 2111. Correspondingly, the side wall includes multiple wall portions, and the second wall 21b and the third wall 21c are two wall portions of the side wall that are arranged opposite to each other in the second direction Y.

[0229] In this embodiment, by setting the first wall 21a with the first electrode terminal 22 as the end cap 212 of the housing 21, and setting the second wall 21b facing the first tab 252 as a wall of the housing 211, the battery cell 20 with this structure can reduce the assembly difficulty between the first current collector 231 and the first electrode terminal 22, and can reduce the difficulty of assembling the electrode assembly 25 and the second current collector 232 into the housing 21 after they are connected to each other, thereby reducing the manufacturing difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0230] According to some embodiments of this application, the capacity of the battery cell 20 is greater than or equal to 500Ah.

[0231] For example, the capacity of the battery cell 20 can be 500Ah, 510Ah, 520Ah, 530Ah, 540Ah, 550Ah, 560Ah, 570Ah, 580Ah, 590Ah, 600Ah, 620Ah, 650Ah, 680Ah, 700Ah, 720Ah, 750Ah, 780Ah, 800Ah, 850Ah, 900Ah, or 950Ah. 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, 1600Ah, 1700Ah, 1800Ah, 1900Ah, 2000Ah, 2100Ah, 2200Ah, 2300Ah, 2400Ah, 2500Ah, 2600Ah, 2700Ah, 2800Ah, 2900Ah, 3000Ah, etc.

[0232] In this embodiment, by setting the capacity of the battery cell 20 to be greater than or equal to 500Ah, the battery cell 20 is a large-capacity battery cell structure, which requires a large overcurrent requirement. Therefore, while increasing the size of the first tab 252 to meet the overcurrent requirement, the first insulating member 24 can alleviate the risk of short circuit between the enlarged first tab 252 and the main body 251. This allows the use of a large-capacity battery cell 20 to be achieved while improving the reliability of the battery cell 20.

[0233] According to some embodiments of this application, see Figure 3 As shown, the outer shell 21 is a cuboid. The dimension of the outer shell 21 in the first direction X is L1, the dimension in the second direction Y is L2, and the dimension in the third direction Z is L3. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other. 3720cm 3 ≤L1×L2×L3≤12500cm 3 And 120mm≤L1≤400mm, 200mm≤L2≤1500mm, 60mm≤L3≤150mm.

[0234] Where L1 is the height of the outer shell 21, L2 is the length of the outer shell 21, and L3 is the thickness of the outer shell 21. Correspondingly, L1 × L2 × L3 is the volume of the outer shell 21, which is 3720 cm³. 3 ≤L1×L2×L3≤12500cm 3 That is, the volume of the outer shell 21 is 3720 cm³. 3 -12500cm 3 .

[0235] For example, the volume of the outer casing 21 can be 3720 cm³. 3 3730cm3 3750cm 3 3800cm 3 3900cm 3 4000cm 3 4100cm 3 4200cm 3 4300cm 3 4400cm 3 4500cm 3 4800cm 3 5000cm 3 5500cm 3 6000cm 3 6500cm 3 7000cm 3 7500cm 3 8000cm 3 8500cm 3 9000cm 3 9500cm 3 10000cm 3 10500cm 3 11000cm 3 11500cm 3 12000cm 3 Or 12500cm 3 wait.

[0236] For example, the dimension L1 of the housing 21 in the first direction X can be 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm, 300mm, 310mm, 320mm, 330mm, 340mm, 350mm, 360mm, 370mm, 380mm, 390mm, or 400mm, etc.

[0237] For example, the dimension L2 of the housing 21 in the second direction Y can be 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm, 950mm, 1000mm, 1050mm, 1100mm, 1150mm, 1200mm, 1250mm, 1300mm, 1350mm, 1400mm, 1450mm, or 1500mm, etc.

[0238] For example, the dimension L3 of the housing 21 in the third direction Z can be 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 125mm, 130mm, 135mm, 140mm, 145mm or 150mm, etc.

[0239] In this embodiment, the outer casing 21 of the battery cell 20 has a cuboid structure. The dimensions of the outer casing 21 in the first direction X, the second direction Y, and the third direction Z are 120mm-400mm, 200mm-1500mm, and 60mm-150mm, respectively, and the volume of the outer casing 21 is 3720cm³. 3 -12500cm 3 This results in a large-capacity battery cell 20 with a larger volume, which requires a larger current flow. Therefore, by increasing the size of the first tab 252 to meet the current flow requirement, the first insulating member 24 can mitigate the risk of short circuit between the enlarged first tab 252 and the main body 251. This allows the battery cell 20 to meet the requirements of large capacity while improving its reliability.

[0240] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 of any of the above schemes.

[0241] Among them, see Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0242] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0243] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0244] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0245] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, in... Figure 2 In the battery device 100, multiple battery cells 20 are arranged inside the housing 10. The multiple battery cells 20 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 20 is housed in the housing 10. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 20 in series, parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in the housing 10.

[0246] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0247] It should be noted that in some embodiments, the battery device 100 may not have a housing 10. The battery device 100 includes multiple battery cells 20, and the battery device 100 composed of multiple battery cells 20 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0248] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 of any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0249] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 20.

[0250] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0251] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized by, The battery includes: a case having a first wall and a second wall connected to each other, a thickness direction of the first wall being parallel to a first direction, a thickness direction of the second wall being parallel to a second direction, the first direction being perpendicular to the second direction; a first electrode terminal provided to the first wall; at least one electrode assembly provided in the case, the electrode assembly including a main body portion and a first tab connected to an end of the main body portion near the second wall in the second direction; a first current collecting member provided in the case, the first current collecting member including a first current collecting portion and a second current collecting portion connected to each other, the first current collecting portion being located between the main body portion and the first wall and connected to the first electrode terminal, the second current collecting portion extending from the first current collecting portion to between the main body portion and the second wall, the first tab including a first connecting portion on a side of the second current collecting portion away from the main body portion in the second direction, the first connecting portion being connected to the second current collecting portion, and the first connecting portion having a first extension area on an end of the first connecting portion away from the first current collecting portion in the first direction; a first insulating member including a first insulating portion and a second insulating portion integrally formed, at least a portion of the first insulating portion being located between the main body portion and the first extension area in the second direction, the second insulating portion being provided to a side of the main body portion away from the first wall in the first direction. A portion of the first insulating portion is located between the main body portion and the second current collecting portion.

2. The battery cell of claim 1, wherein, In the second direction, a dimension of the second insulating portion protruding from a portion of the first insulating portion facing the main body portion is 2 mm to 50 mm.

3. The battery cell of claim 1, wherein, The second insulating portion is connected to a surface of the main body portion away from the first wall in the first direction.

4. The battery cell of claim 1, wherein, The first tab is bent around the second current collecting portion and forms a first root portion, a first bent portion, and the first connecting portion connected in this order, and the first root portion is connected to the main body portion.

5. The battery cell of claim 1, wherein, The first bent portion is located on a side of the second current collecting portion in a third direction, and at least a portion of the second current collecting portion is located between the first root portion and the first connecting portion in the second direction and is connected to the first connecting portion, the first direction, the second direction, and the third direction being perpendicular to each other in pairs. At least a portion of the first insulating portion is located between the first extension area and the first root portion and is connected to a surface of the first root portion facing the first extension area.

6. The battery cell of claim 5, wherein, The first insulating member further includes a third insulating portion provided to a side of the main body portion in the third direction and connected to an end of the first insulating portion away from the first bent portion.

7. The battery cell of claim 5, wherein, The third insulating portion is connected to the second insulating portion.

8. The battery cell of claim 7, wherein, The first insulating portion, the second insulating portion, and the third insulating portion are integrally formed.

9. The battery cell of claim 8, wherein, The third insulating portion is connected to a surface of the main body portion on a side thereof in the third direction.

10. The battery cell of claim 7, wherein, ​ 11. The battery cell of claim 5, wherein, The battery cell comprises two electrode assemblies stacked along the third direction, and the first connecting portions of the first tabs of the two electrode assemblies are connected to the same second current collecting portion.

12. The battery cell of claim 11, wherein, The battery cell comprises two first insulating members, each of which is arranged on one of the electrode assemblies.

13. The battery cell of any one of claims 1-12, wherein, The electrode assembly has a laminated structure, the main body portion comprises a plurality of first pole pieces with the same polarity, and the plurality of first pole pieces are stacked along a third direction. The first tab comprises a plurality of first tab pieces stacked along the third direction. Each first pole piece is connected to a first tab piece at one end thereof close to the second wall along the second direction, and the first pole piece and the first tab piece are integrally formed. The first direction, the second direction, and the third direction are perpendicular to each other. At least one end of the first tab piece is flush with one end of the corresponding first pole piece along the first direction.

14. The battery cell of claim 13, wherein, At one end of the first tab piece close to the first wall along the first direction, the end is flush with one end of the corresponding first pole piece close to the first wall.

15. The battery cell of claim 14, wherein, At one end of the first tab piece away from the first wall along the first direction, the end is flush with one end of the corresponding first pole piece away from the first wall.

16. The battery cell of any one of claims 1-12, wherein, The housing further has a third wall opposite to the second wall along the second direction, and the third wall is connected to the first wall. The battery cell further comprises a second electrode terminal and a second current collecting member. The second electrode terminal is arranged on the first wall, and the second current collecting member is arranged in the housing. The second current collecting member comprises a third current collecting portion and a fourth current collecting portion connected to each other. The third current collecting portion is located between the main body portion and the first wall and connected to the second electrode terminal. The fourth current collecting portion extends from the third current collecting portion to between the main body portion and the third wall. The electrode assembly further comprises a second tab. The polarity of the second tab is opposite to that of the first tab. Along the second direction, the second tab is connected to one end of the main body portion facing the third wall, and the second tab is connected to the fourth current collecting portion.

17. The battery cell of any one of claims 1-12, wherein, The battery cell further comprises: a separator made of insulating material, the separator having a receiving space, at least part of the electrode assembly being located in the receiving space, and at least part of the second current collecting portion being located in the receiving space.

18. The battery cell of any one of claims 1-12, wherein, The housing comprises: a shell having an opening formed at at least one end thereof along the first direction, at least part of the electrode assembly being accommodated in the shell; an end cover closing the opening; wherein the end cover is the first wall, and the shell comprises the second wall.

19. The battery cell of any one of claims 1-12, wherein, The capacity of the battery cell is greater than or equal to 500 Ah.

20. The battery cell of any one of claims 1-12, wherein, The shell has a cuboid shape, a size of the shell in the first direction is L1, a size of the shell in the second direction is L2, and a size of the shell in a third direction is L3, the first direction, the second direction, and the third direction are perpendicular to each other; wherein 3720 cm 3 ≤ L1 x L2 x L3 ≤ 12500 cm 3 and 120 mm ≤ L1 ≤ 400 mm, 200 mm ≤ L2 ≤ 1500 mm, 60 mm ≤ L3 ≤ 150 mm.

21. A battery device, characterized by A battery including the battery cell of any one of claims 1-20.

22. An electrical device, comprising: A battery including the battery cell of any one of claims 1-20, the battery cell being used to provide electrical energy.

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