Battery cell, battery, and electric device

Abstract

A battery cell (20), a battery (100), and an electric device, relating to the technical field of batteries. The battery cell (20) comprises a housing (21), an electrode assembly (22), an insulating member (23), and a pressure relief component (24). The housing (21) has a wall portion (211), the pressure relief component (24) is disposed on the wall portion (211), and the pressure relief component (24) is configured to relieve the internal pressure of the battery cell (20). The electrode assembly (22) is accommodated in the housing (21). The insulating member (23) is disposed on the side of the wall portion (211) facing the electrode assembly (22). In the direction of thickness of the wall portion (211), the wall portion (211) has a first surface (2112) facing the electrode assembly (22), at least part of the pressure relief component (24) protrudes from the first surface (2112), an avoidance portion (231) is formed on the side of the insulating member (23) facing the wall portion (211), and the avoidance portion (231) accommodates the part of the pressure relief component (24) protruding from the first surface (2112). This allows the insulating member (23) to avoid the part of the pressure relief component (24) protruding from the first surface (2112), so as to alleviate interference between the pressure relief component (24) and the insulating member (23), and also protect the pressure relief component (24) to a certain extent, so as to reduce the phenomenon of wear or damage to the pressure relief component (24).

Description

Battery cells, batteries and electrical devices Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery, 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. In battery technology, to ensure the safety of individual battery cells, pressure relief components are typically installed on the outer casing of the battery cell to release internal pressure. This allows the pressure relief component to be activated when the internal pressure or temperature of the battery cell reaches a threshold, thus releasing the internal pressure. However, existing pressure relief components for battery cells are prone to interference with other components within the battery cell during assembly, resulting in poor assembly quality and hindering the improvement of battery cell production quality.

[0003] Summary of the Invention

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

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing, an electrode assembly, an insulating member, and a pressure relief member; the housing has a wall portion, the wall portion is provided with a pressure relief member, the pressure relief member is configured to release the internal pressure of the battery cell; the electrode assembly is housed within the housing portion; the insulating member is disposed on the side of the wall portion facing the electrode assembly, the insulating member is configured to insulatingly isolate the wall portion and the electrode assembly; wherein, along the thickness direction of the wall portion, the wall portion has a first surface facing the electrode assembly, at least a portion of the pressure relief member protrudes from the first surface, and a clearance portion is formed on the side of the insulating member facing the wall portion, the clearance portion accommodating the portion of the pressure relief member protruding from the first surface.

[0006] In the above technical solution, by providing a clearance portion on the side of the insulating component facing the wall to accommodate the portion of the pressure relief component protruding from the first surface, the insulating component can avoid the portion of the pressure relief component protruding from the first surface. On the one hand, this can alleviate the interference between the pressure relief component and the insulating component or other components, thereby improving the assembly quality of the battery cell. On the other hand, by accommodating the portion of the pressure relief component protruding from the first surface within the clearance portion of the insulating component, the insulating component can also provide a certain degree of protection for the pressure relief component, thereby reducing the wear or damage to the pressure relief component during assembly, which is beneficial to improving the production quality of the battery cell.

[0007] In some embodiments, the pressure relief component is separately disposed and connected to the wall portion, and the projection of the pressure relief component is entirely located within the clearance portion along the thickness direction of the wall portion.

[0008] In the above technical solution, by setting the projection of the pressure relief component in the thickness direction of the wall to be located inside the avoidance part, the avoidance part can avoid the entire pressure relief component, which is beneficial to further improve the effect of the insulating part avoiding the part of the pressure relief component protruding from the first surface, thereby further alleviating the interference phenomenon between the pressure relief component and the insulating part or other components, so as to improve the assembly quality of the battery cell.

[0009] In some embodiments, along the thickness direction of the wall portion, the pressure relief member has opposing second and third surfaces, the third surface being disposed facing the electrode assembly, the second surface having a first groove, and the pressure relief member having a first protrusion protruding from the third surface at a position corresponding to the first groove, the first protrusion having a pressure relief groove, the pressure relief member being configured to split along at least a portion of the pressure relief groove when the battery cell is depressurized, to release the internal pressure of the battery cell; wherein, at least a portion of the first protrusion protrudes from the first surface.

[0010] In the above technical solution, the pressure relief component is a concave-convex structure with a first groove on one side and a first protrusion on the other side. The pressure relief groove for pressure relief is provided on the first protrusion, and the pressure relief component is a structure in which the first protrusion protrudes from the first surface and is accommodated in the clearance portion of the insulating component. The battery cell with this structure is convenient for processing the pressure relief groove on the pressure relief component, which is beneficial to improving the material flow pattern of the pressure relief component during the process of forming the pressure relief groove, thereby improving the processing quality of the pressure relief component and improving the structural strength of the area of ​​the pressure relief component where the pressure relief groove is set, thereby alleviating the deformation of the pressure relief component during use. On the other hand, by setting at least a part of the first protrusion of the pressure relief component to be accommodated in the clearance portion, the insulating component can avoid the first protrusion, which is beneficial to alleviating the interference between the first protrusion and the insulating component or other components. The insulating component can also play a certain protective role for the first protrusion with the pressure relief groove, so as to reduce the wear or damage of the first protrusion during the assembly process, thereby helping to reduce the premature opening of the valve and pressure relief of the pressure relief component.

[0011] In some embodiments, along the thickness direction of the wall portion, the insulating member has a fourth surface that abuts against the first surface, and the clearance portion includes a second groove recessed from the fourth surface toward the electrode assembly to form a second protrusion on the side of the insulating member facing the electrode assembly and at a position corresponding to the second groove, the second protrusion abutting against the electrode assembly; wherein the second groove accommodates at least a portion of the first protrusion.

[0012] In the above technical solution, a second groove is provided on the fourth surface of the insulating member to accommodate at least a portion of the first protrusion, and a second protrusion is formed on the side of the insulating member away from the fourth surface and corresponding to the position of the second groove, which abuts against the electrode assembly. The structure of providing a groove on the insulating member avoids at least a portion of the first protrusion. The structure is simple and easy to implement. In addition, while the insulating member avoids at least a portion of the first protrusion, it can also achieve mutual abutment between the second protrusion of the insulating member and the electrode assembly. This is beneficial to improving the stability and reliability of the electrode assembly and the insulating member assembled in the housing, so as to reduce the phenomenon of shaking or displacement of the insulating member and the electrode assembly during use.

[0013] In some embodiments, the second protrusion is provided with a through hole, which communicates with the second groove.

[0014] In the above technical solution, by providing a through hole on the second protrusion that is interconnected with the second groove, the space on the side of the insulating member facing the electrode assembly can be interconnected with the second groove of the insulating member used to avoid the first protrusion through the through hole. This allows the gas inside the casing to pass through the through hole into the second groove and then be discharged to the outside of the casing through the pressure relief component when the battery cell is depressurized by the pressure relief component. This helps to improve the smoothness of internal venting when the battery cell is depressurized, thereby effectively improving the pressure relief rate of the battery cell. This helps to reduce the risk of explosion or bursting of the battery cell due to untimely pressure relief, thereby improving the reliability of the battery cell.

[0015] In some embodiments, the clearance portion further includes a third groove, the third groove being recessed from the fourth surface toward the electrode assembly and extending through the sidewall of the second groove; wherein, along the thickness direction of the wall portion, the bottom surface of the third groove is closer to the wall portion than the bottom surface of the second groove, the second groove accommodates a portion of the first protrusion, and the third groove accommodates a portion of the first protrusion located outside the second groove.

[0016] In the above technical solution, a third groove is also provided on the fourth surface of the insulating component. The third groove is a structure that penetrates the side of the second groove, and the bottom surface of the third groove is closer to the wall in the thickness direction of the wall than the bottom surface of the second groove, so that the groove depth of the third groove is less than the groove depth of the second groove. The third groove is a structure that further expands the side of the second groove, so that the third groove and the second groove can work together to avoid the first protrusion. The insulating component with this structure only needs to be partially expanded on the basis of the second groove to form the third groove to avoid the first protrusion. There is no need to expand the area of ​​the insulating component where the second groove is set, thereby reducing the volume of the second protrusion corresponding to the second groove. This helps to save the space occupied by the insulating component, improve the internal space utilization of the battery cell, and reduce the processing difficulty and processing cost of the insulating component.

[0017] In some embodiments, along the thickness direction of the wall portion, the minimum distance between the bottom surface of the third groove and the first protrusion is D1, which satisfies 0.1mm≤D1≤1.5mm.

[0018] In the above technical solution, by setting the minimum distance between the bottom surface of the third groove and the first protrusion in the thickness direction of the wall to be greater than or equal to 0.1 mm, it is beneficial to further improve the avoidance effect of the insulating part on the first protrusion, so as to reduce the phenomenon of the insulating part interfering with or wearing the first protrusion, thereby further improving the assembly quality of the battery cell. In addition, by setting the minimum distance between the bottom surface of the third groove and the first protrusion in the thickness direction of the wall to be less than or equal to 1.5 mm, the phenomenon of space waste caused by the excessive distance between the bottom surface of the third groove and the first protrusion is alleviated, which is beneficial to improve the internal space utilization rate of the battery cell.

[0019] In some embodiments, the insulating member includes a body portion and an abutment portion; the body portion is disposed between the wall portion and the electrode assembly along the thickness direction of the wall portion; the abutment portion is connected to the side of the body portion facing the wall portion, and the abutment portion abuts against the first surface; wherein, along the thickness direction of the wall portion, the projection of the abutment portion does not overlap with the projection of the first protrusion, so as to form a gap space between the body portion and the first surface, the gap space being the clearance portion.

[0020] In the above technical solution, the insulating member is provided with a body part and an abutment part connected to the side of the body part facing the wall part. By abutting the abutment part against the first surface of the wall part, and the projection of the abutment part in the thickness direction of the wall part does not overlap with the first protrusion of the pressure relief member, the abutment part is a structure supported between the body part and the wall part. This makes the body part and the wall part of the insulating member a structure that is spaced apart in the thickness direction of the wall part. This allows a space to be formed between the body part and the first surface of the wall part of the insulating member to avoid the first protrusion of the pressure relief member, thus forming an avoidance part for avoiding the first protrusion. The structure is simple and easy to assemble.

[0021] In some embodiments, the insulating member includes a plurality of abutting portions, each abutting portion being connected to the side of the body portion facing the wall portion, and the plurality of abutting portions being spaced apart.

[0022] In the above technical solution, by connecting multiple abutment parts on the side of the main body facing the wall, and arranging the multiple abutment parts at intervals, the structural stability of the insulating component assembled between the electrode assembly and the wall can be further improved, and the effect of the multiple abutment parts supporting the main body can be improved, thereby improving the overall structural strength of the insulating component. This can reduce the phenomenon of deformation or collapse of the main body during use, and alleviate the phenomenon of interference between the main body and the first protrusion of the pressure relief component after deformation, thereby further improving the effect of the insulating component avoiding the first protrusion of the pressure relief component.

[0023] In some embodiments, along the thickness direction of the wall portion, the minimum distance between the body portion and the first protrusion is D2, satisfying 0.1mm≤D2≤1.5mm.

[0024] In the above technical solution, by setting the minimum distance between the body and the first protrusion in the thickness direction of the wall to be greater than or equal to 0.1 mm, it is beneficial to further improve the avoidance effect of the insulating part on the first protrusion, so as to reduce the phenomenon of interference or wear of the body of the insulating part on the first protrusion, thereby further improving the assembly quality of the battery cell. In addition, by setting the minimum distance between the body and the first protrusion in the thickness direction of the wall to be less than or equal to 1.5 mm, the phenomenon of space waste caused by excessive distance between the body and the first protrusion is alleviated, which is beneficial to improve the internal space utilization rate of the battery cell.

[0025] In some embodiments, the wall portion is provided with a pressure relief hole, and the pressure relief component is connected to the wall portion and blocks the pressure relief hole; wherein, the first surface is provided with an assembly groove, the pressure relief hole penetrates the bottom surface of the assembly groove, along the thickness direction of the wall portion, a portion of the pressure relief component is accommodated in the assembly groove, and the second surface abuts against the bottom surface of the assembly groove.

[0026] In the above technical solution, by providing an assembly groove for assembling the pressure relief component on the first surface of the wall, the pressure relief hole is located on the bottom surface of the assembly groove, and the second surface of the pressure relief component abuts against the bottom surface of the assembly groove, the battery cell with this structure can improve the sealing effect of the pressure relief component on the pressure relief hole, which is beneficial to reducing the risk of leakage of the battery cell during use. On the other hand, the assembly groove can play a certain limiting and positioning role for the pressure relief component, which is beneficial to improving the stability of the pressure relief component assembled on the wall and reducing the difficulty of connecting the pressure relief component to the wall.

[0027] In some embodiments, the first surface and the third surface are coplanar.

[0028] In the above technical solution, by setting the first surface of the wall and the third surface of the pressure relief component with the first protrusion as coplanar, the area of ​​the pressure relief component without the first protrusion is accommodated as a whole in the assembly groove. On the one hand, the stability of the pressure relief component assembled onto the wall can be further improved, thereby improving the assembly quality of the battery cell. On the other hand, the assembly groove can also play a certain protective role for the pressure relief component and can alleviate the interference between the area of ​​the pressure relief component without the first protrusion and the insulating component or other components.

[0029] In some embodiments, the first protrusion includes a first sidewall and a first bottom wall, the first sidewall surrounding the first bottom wall and connected to the first bottom wall, the first sidewall and the first bottom wall together defining the first groove, and the pressure relief groove being disposed on the first bottom wall.

[0030] In the above technical solution, the first protrusion includes a first sidewall and a first bottom wall. The first sidewall surrounds the first bottom wall so that the first sidewall and the first bottom wall of the first protrusion together define the first groove. By setting the pressure relief groove on the first bottom wall of the first protrusion, the pressure relief groove is a structure set on the bottom wall of the first groove. The pressure relief component with this structure is convenient to process the pressure relief groove on the first protrusion, which helps to reduce the processing difficulty of the pressure relief groove. On the other hand, the first sidewall can also absorb and buffer some of the stress transmitted from the wall to the pressure relief component, so as to reduce the stress influence on the area of ​​the first protrusion where the pressure relief groove is set, which helps to improve the reliability and stability of the pressure relief component.

[0031] In some embodiments, the first bottom wall includes a main body and an arched portion, the main body connecting the arched portion and the first side wall, the main body surrounding the outside of the arched portion; wherein, along the thickness direction of the wall portion, the arched portion arches from the main body in a direction away from the electrode assembly to form a fourth groove on the side of the first bottom wall facing the electrode assembly and corresponding to the position of the arched portion, the pressure relief groove being disposed in the main body.

[0032] In the above technical solution, by setting the first bottom wall portion of the first protrusion as an arched structure in the direction away from the electrode assembly, the first bottom wall forms an arched portion and a main body portion surrounding the outside of the arched portion and connecting the arched portion to the first side wall. By setting the pressure relief groove on the main body portion, on the one hand, the difficulty of processing the pressure relief groove on the first bottom wall can be reduced, and the material flow pattern of the first bottom wall during the process of forming the pressure relief groove can be improved, thereby improving the processing quality of the pressure relief component. On the other hand, the structural strength of the first bottom wall can be further improved, which can help alleviate the deformation of the pressure relief component during use, thereby improving the reliability and stability of the pressure relief component.

[0033] In some embodiments, the pressure relief groove is disposed around the arch.

[0034] In the above technical solution, by setting the pressure relief groove as a ring structure surrounding the arched part, the pressure relief component can be completely detached from the area where the arched part is formed on the first bottom wall after the entire structure cracks along the pressure relief groove when the battery cell is depressurized. This helps to expand the pressure relief area of ​​the battery cell, thereby further improving the pressure relief rate of the battery cell, reducing the risk of explosion or bursting caused by untimely pressure relief, and thus effectively improving the reliability of the battery cell.

[0035] In some embodiments, the pressure relief groove is disposed on the side of the main body away from the electrode assembly along the thickness direction of the wall portion.

[0036] In the above technical solution, by setting the pressure relief groove on the side of the main body of the first bottom wall away from the electrode assembly, the pressure relief groove is formed on the bottom surface of the first groove, thereby reducing the difficulty of forming the pressure relief groove on the main body of the first bottom wall. This is beneficial to form the pressure relief groove at the same time as forming the first groove and the arch, thereby improving the processing efficiency of the pressure relief component.

[0037] In some embodiments, the pressure relief groove is stamped onto the main body.

[0038] In the above technical solution, by setting the pressure relief groove as a structure formed by stamping on the main body of the first bottom wall, on the one hand, the manufacturing difficulty of the pressure relief groove can be reduced and the processing efficiency of the pressure relief groove can be improved. On the other hand, in the structure in which the pressure relief component has a first groove and a first protrusion, and the first bottom wall of the first protrusion has an arched part, it is convenient for the material flow of the pressure relief groove to be formed during the stamping process, which is conducive to improving the processing consistency of the pressure relief groove and thus improving the production quality of the pressure relief component.

[0039] In some embodiments, the pressure relief component is separately disposed from the wall portion, and the pressure relief component is welded to the wall portion.

[0040] In the above technical solution, by welding the pressure relief component to the wall, the difficulty of setting the pressure relief component on the shell can be reduced, thereby reducing the manufacturing difficulty of the battery cell. On the other hand, it is beneficial to improve the structural strength of the pressure relief component connected to the wall, thereby improving the assembly stability between the pressure relief component and the wall.

[0041] In some embodiments, the pressure relief component is integrally formed with the wall portion.

[0042] In the above technical solution, by setting the pressure relief component and the wall as an integral structure, the battery cell with this structure can improve the structural strength of the pressure relief component connected to the wall, thereby reducing the risk of the pressure relief component detaching from the wall during use and thus improving the stability of the battery cell.

[0043] In some embodiments, the material of the housing is the same as the material of the pressure relief component.

[0044] In the above technical solution, by setting the material of the outer shell and the material of the pressure relief component to be the same, the pressure relief component and the wall are welded to the same material, thereby improving the welding quality between the pressure relief component and the wall, further improving the assembly quality between the pressure relief component and the wall, and further reducing the welding difficulty between the pressure relief component and the wall.

[0045] In some embodiments, both the outer casing and the pressure relief component are made of steel.

[0046] In the above technical solution, by using steel as the material for both the outer casing and the pressure relief component, the structural strength of the outer casing can be improved to alleviate the phenomenon of expansion and deformation of the battery cell casing during use. This helps to reduce the stress impact on the pressure relief component caused by the deformation of the outer casing. On the other hand, the overall structural strength of the pressure relief component can be improved to alleviate the deformation of the pressure relief component during use. This reduces the phenomenon of fatigue damage to the pressure relief component, thereby reducing the risk of premature valve opening and pressure relief of the battery cell, and improving the service life and reliability of the battery cell.

[0047] In some embodiments, the housing includes a shell and an end cap; the interior of the shell forms a receiving cavity with an opening, and the electrode assembly is received within the receiving cavity; the end cap closes the opening; wherein the end cap is the wall portion.

[0048] In the above technical solution, by setting the wall of the outer casing as an end cap for sealing the opening, the battery cell with this structure is easy to assemble pressure relief components on the end cap, which helps to reduce the manufacturing difficulty of the battery cell and improve the production efficiency of the battery cell.

[0049] In some embodiments, the housing includes a shell and an end cap; the shell includes an integrally formed second bottom wall and a second side wall, the second side wall surrounding the second bottom wall, one end of the second side wall being connected to the second bottom wall along the thickness direction of the wall portion, and the other end forming an opening, the second bottom wall and the second side wall together defining a receiving cavity, the electrode assembly being received within the receiving cavity; the end cap closes the opening; wherein, the second bottom wall is the wall portion.

[0050] In the above technical solution, by setting the wall of the outer casing as a second bottom wall that is opposite to the end cap in the thickness direction of the wall, the battery cell with this structure can make the area where the pressure relief component is set in the outer casing far away from the end cap. This can effectively alleviate the phenomenon of stress generated by the connection between the end cap and the casing acting on the pressure relief component, thereby reducing the impact on the pressure relief component. This helps to reduce the risk of cracking or structural strength reduction of the pressure relief component under stress, thereby improving the service life and reliability of the battery cell.

[0051] Secondly, embodiments of this application also provide a battery, including the aforementioned battery cell.

[0052] 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

[0053] 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.

[0054] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0055] Figure 2 is an exploded view of the battery structure provided in some embodiments of this application;

[0056] Figure 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0057] Figure 4 is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0058] Figure 5 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0059] Figure 6 is a schematic diagram of the structure of the insulating component of a battery cell provided in some embodiments of this application;

[0060] Figure 7 is a cross-sectional view of a pressure relief component for a battery cell provided in some embodiments of this application;

[0061] Figure 8 is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0062] Figure 9 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0063] Figure 10 is a partial enlarged view of point A of the battery cell shown in Figure 9;

[0064] Figure 11 is an exploded view of the structure of the insulating component of a battery cell provided in some embodiments of this application.

[0065] Icons: 1000 - Vehicle; 100 - Battery; 10 - Housing; 11 - First Housing Body; 12 - Second Housing Body; 20 - Battery Cell; 21 - Casing; 211 - Wall; 2111 - Pressure Relief Hole; 2112 - First Surface; 2112a - Assembly Groove; 212 - Housing; 2121 - Opening; 213 - End Cap; 22 - Electrode Assembly; 221 - Tab; 23 - Insulator; 231 - Clearance Part; 2311 - Second Recess; 2312 - Third Recess; 232 - Fourth Surface; 233 - Second 2331 - Through hole; 234 - Body part; 2341 - Positioning hole; 235 - Abutting part; 24 - Pressure relief component; 241 - Pressure relief groove; 242 - Second surface; 243 - Third surface; 244 - First groove; 245 - First protrusion; 2451 - First side wall; 2452 - First bottom wall; 2452a - Body part; 2452b - Arched part; 2452c - Fourth groove; 25 - Electrode terminal; 26 - Current collector; 200 - Controller; 300 - Motor; X - Thickness direction of the wall part. Detailed Implementation

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] In this application, "multiple" means two or more (including two).

[0073] 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.

[0074] 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.

[0075] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0076] 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.

[0077] 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.

[0078] 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, nickel, 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.).

[0079] 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 may 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 oxide may 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 0.05At least one of O2 and its modified compounds.

[0080] 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.

[0081] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0082] 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 electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, 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 alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0083] As an example, the 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.

[0084] 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.

[0085] 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.

[0086] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0087] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0088] 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.

[0089] 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.

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

[0091] In some 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.

[0092] 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.

[0093] 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.

[0094] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0095] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0096] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0097] 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.

[0098] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0099] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0100] In some implementations, the electrode assembly is a stacked structure.

[0101] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0102] 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.

[0103] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0104] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0105] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0106] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0107] 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.

[0108] 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.

[0109] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0110] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0111] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0112] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0113] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0114] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0115] Batteries possess outstanding advantages such as high energy density, low environmental pollution, high power density, long lifespan, wide applicability, and low self-discharge coefficient, making them a crucial component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as energy density, cycle life, discharge capacity, and charge / discharge rate.

[0116] In battery technology, to ensure the safety of a typical battery cell, a pressure relief component is usually installed on the battery cell to release the internal pressure, thereby effectively improving the safety of the battery cell. In related technologies, pressure relief components are typically formed integrally onto the outer casing using a molding process. This means they are integrated into the casing of the battery cell or connected to the casing via welding or other methods. When the internal pressure or temperature of the battery cell reaches a threshold, the pressure relief component can be actuated and opened to release the internal pressure. The pressure relief component usually has pressure relief grooves stamped on it, creating a weak area that allows it to crack and release the internal pressure of the battery cell when pressure is released. However, to improve the material flow pattern of the pressure relief grooves during stamping, pressure relief components in related technologies often have protruding structures on both sides, especially in steel components. However, this structure makes it very easy for pressure relief components with this structure to interfere with other components inside the battery cell during assembly, resulting in poor assembly quality and hindering the improvement of battery cell production quality.

[0117] Based on the above considerations, in order to solve the problem of poor assembly quality of battery cells, this application provides a battery cell including a casing, an electrode assembly, an insulating member, and a pressure relief member. The casing has a wall portion, and the wall portion is provided with a pressure relief member configured to release the internal pressure of the battery cell. The electrode assembly is housed within the casing. The insulating member is disposed on the side of the wall portion facing the electrode assembly, and the insulating member is configured to insulate and isolate the wall portion and the electrode assembly. Along the thickness direction of the wall portion, the wall portion has a first surface facing the electrode assembly, at least a portion of the pressure relief member protrudes from the first surface, and a clearance portion is formed on the side of the insulating member facing the wall portion, the clearance portion accommodating the portion of the pressure relief member protruding from the first surface.

[0118] In this type of battery cell, by providing a clearance portion on the side of the insulator facing the wall to accommodate the portion of the pressure relief component protruding from the first surface, the insulator can avoid the portion of the pressure relief component protruding from the first surface. On the one hand, this can alleviate interference between the pressure relief component and the insulator or other components, thereby improving the assembly quality of the battery cell. On the other hand, by accommodating the portion of the pressure relief component protruding from the first surface within the clearance portion of the insulator, the insulator can also provide a certain degree of protection for the pressure relief component, thereby reducing wear or damage to the pressure relief component during assembly, which is beneficial to improving the production quality of the battery cell.

[0119] 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 for such an electrical device can be constructed using battery cells and batteries disclosed in this application. This helps to alleviate the problem of interference between the pressure relief components of the battery cells and other components during assembly, thereby improving the assembly quality of the battery cells.

[0120] This application provides an electrical device that uses a battery 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.

[0121] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0122] Please refer to Figure 1, which is a structural schematic diagram 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 100 is installed inside the vehicle 1000. The battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 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 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0123] In some embodiments of this application, the battery 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.

[0124] Please refer to Figures 2 and 3. Figure 2 is an exploded view of the battery 100 provided in some embodiments of this application, and Figure 3 is a schematic diagram of the battery cell 20 provided in some embodiments of this application. The battery 100 includes a housing 10 and a battery cell 20, which is housed within the housing 10.

[0125] 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.

[0126] 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, the shape of the box 10 is a cuboid.

[0127] In battery 100, there can be one or more battery cells 20 disposed within housing 10. When there are multiple battery cells 20 disposed within 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 multiple battery cells 20 is housed within housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form a battery module, 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 housing 10.

[0128] In some embodiments, the battery 100 may also include other structures. For example, the battery 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0129] 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 in the form of a cuboid, cylinder, prism, or other shapes. For example, in Figure 3, the battery cell 20 has a cuboid structure.

[0130] According to some embodiments of this application, referring to FIG3, and further referring to FIG4, 5 and 6, FIG4 is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application, FIG5 is a partial cross-sectional view of a battery cell 20 provided in some embodiments of this application, and FIG6 is a schematic diagram of the structure of the insulating member 23 of the battery cell 20 provided in some embodiments of this application. This application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, an insulating member 23 and a pressure relief member 24. The housing 21 has a wall portion 211, and the wall portion 211 is provided with the pressure relief member 24, which is configured to release the internal pressure of the battery cell 20. The electrode assembly 22 is housed within the housing 21. The insulating member 23 is disposed on the side of the wall portion 211 facing the electrode assembly 22, and the insulating member 23 is configured to insulate and isolate the wall portion 211 and the electrode assembly 22. Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 facing the electrode assembly 22, at least a portion of the pressure relief member 24 protrudes from the first surface 2112, and the insulating member 23 has a clearance portion 231 formed on the side facing the wall portion 211, the clearance portion 231 accommodating the portion of the pressure relief member 24 protruding from the first surface 2112.

[0131] 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 cylinder, cuboid, or prism. Similarly, the outer shell 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0132] In some embodiments, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity for accommodating the electrode assembly 22 and has an opening 2121. That is, the housing 212 is a hollow structure with an opening 2121 at one end. The end cap 213 covers the opening 2121 of the housing 212 and forms a sealed connection to form a closed space for accommodating the electrode assembly 22 and the electrolyte.

[0133] It should be noted that the wall portion 211 with the pressure relief component 24 can be the end cap 213 of the outer casing 21, or it can be a wall of the housing 212 of the outer casing 21. For example, in Figures 3 and 4, the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 211 can also be a second bottom wall of the housing 212 and the end cap 213 disposed opposite each other, or the wall portion 211 can also be a second side wall of the housing 212 and the end cap 213 that are adjacent to and connected to each other.

[0134] When assembling the battery cell 20, the electrode assembly 22 can be placed into the housing 212 first, and the electrolyte can be filled into the housing 212. Then, the end cap 213 can be closed onto the opening 2121 of the housing 212 to complete the assembly of the battery cell 20.

[0135] The housing 212 can have various shapes, such as a cylinder, cuboid, or prism. The shape of the housing 212 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, a cylindrical housing 212 can be selected; if the electrode assembly 22 is a cuboid structure, a cuboid housing 212 can be selected. Of course, the end cap 213 can also have various structures, such as a plate-like structure or a hollow structure with one end open.

[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 may include a housing 212 and two end caps 213. The housing 212 is a hollow structure with openings 2121 on opposite sides. One end cap 213 is fitted onto one opening 2121 of the housing 212 and forms a sealed connection to form a closed space for accommodating the electrode assembly 22 and the electrolyte. That is, the housing 212 has openings 2121 on opposite sides, and the two end caps 213 are fitted onto the opposite sides of the housing 212 to close the corresponding openings 2121.

[0137] It should be noted that the electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. The structure of the electrode assembly 22 can be various. For example, the electrode assembly 22 can be a wound structure formed by winding the positive electrode, the separator and the negative electrode, or a stacked structure formed by arranging the positive electrode, the separator and the negative electrode in layers.

[0138] For example, the separator 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.

[0139] Optionally, the electrode assembly 22 housed within the housing 21 can be one or more. For example, in Figure 4, two electrode assemblies 22 are disposed within the housing 21 of the battery cell 20, and the two electrode assemblies 22 are stacked along their thickness direction; that is, the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. Of course, the structure of the battery cell 20 is not limited to this; in other embodiments, the electrode assembly 22 housed within the housing 21 can be one, three, four, five, six, seven, or eight, etc.

[0140] In some embodiments, as shown in Figures 3 and 4, the battery cell 20 may further include an electrode terminal 25, which is insulated and mounted on the housing 21. One end of the electrode assembly 22 is formed with a tab 221, and the electrode terminal 25 is electrically connected to the tab 221 of the electrode assembly 22 to output or input electrical energy of the battery cell 20.

[0141] It should be noted that the electrode terminal 25 is insulated and mounted on the housing 21, meaning that there is no electrical connection between the electrode terminal 25 and the housing 21.

[0142] In Figures 3 and 4, the battery cell 20 includes two electrode terminals 25, which are spaced apart on the end cap 213. Correspondingly, each electrode assembly 22 has two tabs 221 with opposite polarities. The two tabs 221 are spaced apart and located at the end of the electrode assembly 22 facing the end cap 213. The two electrode terminals 25 are electrically connected to the two tabs 221 of the electrode assembly 22, respectively, to realize the input or output of the positive and negative electrodes of the battery cell 20. It should be noted that the tabs 221 of the electrode assembly 22 are formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer, or by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer. If tab 221 is used as the positive electrode of output electrode assembly 22, then tab 221 is a component formed by stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if tab 221 is used as the negative electrode of output electrode assembly 22, then tab 221 is a component formed by stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer.

[0143] For example, the electrode terminal 25 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0144] Optionally, the structure of the electrode terminals 25 mounted on the housing 21 can be varied. For example, in Figures 3 and 4, both electrode terminals 25 are mounted on the end cap 213 of the housing 21. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 can also have other structures. For example, both electrode terminals 25 can be mounted on the housing 212 of the housing 21. Similarly, one electrode terminal 25 can be mounted on the housing 212 of the housing 21, and the other electrode terminal 25 can be mounted on the end cap 213 of the housing 21.

[0145] In some embodiments, as shown in FIG4, the battery cell 20 may further include two current collectors 26. Both current collectors 26 are disposed within the housing 21 and are spaced apart. Each current collector 26 is used to connect an electrode terminal 25 and a tab 221 of the same polarity in a plurality of electrode assemblies 22 to realize the electrical connection between the electrode terminal 25 and the electrode assembly 22, which helps to reduce the assembly difficulty between the tab 221 and the electrode terminal 25.

[0146] For example, the material of the current collector 26 can be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0147] In this embodiment, the insulating member 23 serves to insulate and isolate the wall portion 211 and the electrode assembly 22. The insulating member 23 is disposed on the side of the wall portion 211 facing the electrode assembly 22. That is, the insulating member 23 is located between the wall portion 211 and the electrode assembly 22 in the thickness direction X of the wall portion.

[0148] For example, the insulating element 23 can be made of various materials, such as rubber, silicone, or plastic.

[0149] In this embodiment, the pressure relief component 24 plays a pressure relief role in the battery cell 20, 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.

[0150] The wall portion 211 is provided with a pressure relief component 24. The pressure relief component 24 and the wall portion 211 can be integrally formed or separately configured. For example, in Figures 4 and 5, the pressure relief component 24 and the wall portion 211 are separately configured. The wall portion 211 is provided with a pressure relief hole 2111. The pressure relief component 24 is connected to the wall portion 211 and blocks the pressure relief hole 2111. That is, the pressure relief component 24 is assembled on the wall portion 211 and blocks and covers the pressure relief hole 2111. The pressure relief hole 2111 penetrates the wall portion 211 and connects the inside and outside of the outer shell 21, so that when the pressure relief component 24 is actuated and cracked, the inside and outside of the outer shell 21 can be interconnected to release the internal pressure of the battery cell 20. Similarly, in embodiments where the pressure relief component 24 and the wall portion 211 are separate but connected, the structure by which the pressure relief component 24 is connected to the wall portion 211 can be varied, such as welding, snap-fitting, or bonding.

[0151] Referring to FIG7, which is a cross-sectional view of a pressure relief component 24 of a battery cell 20 provided in some embodiments of the present application, the pressure relief component 24 is provided with a pressure relief groove 241, and the pressure relief component 24 can be at least partially cracked along the area where the pressure relief groove 241 is located when the battery cell 20 is depressurized, so as to release the internal pressure of the battery cell 20.

[0152] For example, the pressure relief groove 241 on the pressure relief component 24 is formed by a stamping process.

[0153] Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 facing the electrode assembly 22. At least a portion of the pressure relief member 24 protrudes from the first surface 2112. That is, at least a portion of the pressure relief member 24 is a structure that protrudes from the side of the wall portion 211 facing the electrode assembly 22 in the thickness direction X of the wall portion. The pressure relief member 24 may be entirely located on the side of the wall portion 211 facing the electrode assembly 22, or it may only partially protrude from the side of the wall portion 211 facing the electrode assembly 22.

[0154] An allowance portion 231 is formed on the side of the insulating member 23 facing the wall portion 211. The allowance portion 231 accommodates the portion of the pressure relief member 24 that protrudes from the first surface 2112. In other words, the insulating member 23 has an allowance portion 231 on the side of the wall portion facing the wall portion 211 in the thickness direction X of the wall portion, which can allow the portion of the pressure relief member 24 that protrudes from the first surface 2112 to be accommodated in the allowance portion 231 of the insulating member 23. That is, the portion of the pressure relief member 24 that protrudes from the first surface 2112 does not contact the insulating member 23.

[0155] Alternatively, the clearance portion 231 may be a clearance groove provided on the side of the insulating member 23 facing the wall portion 211, or a clearance space formed on the side of the insulating member 23 facing the wall portion 211, etc.

[0156] In this embodiment, by providing a clearance portion 231 on the side of the insulating member 23 facing the wall portion 211 to accommodate the portion of the pressure relief component 24 protruding from the first surface 2112, the insulating member 23 can avoid the portion of the pressure relief component 24 protruding from the first surface 2112. On the one hand, this can alleviate the interference between the pressure relief component 24 and the insulating member 23 or other components, thereby improving the assembly quality of the battery cell 20. On the other hand, by accommodating the portion of the pressure relief component 24 protruding from the first surface 2112 within the clearance portion 231 of the insulating member 23, the insulating member 23 can also provide a certain degree of protection for the pressure relief component 24, thereby reducing the wear or damage to the pressure relief component 24 during the assembly process, which is beneficial to improving the production quality of the battery cell 20.

[0157] According to some embodiments of this application, as shown in Figures 5 and 6, the pressure relief component 24 and the wall portion 211 are separately provided but connected. Along the thickness direction X of the wall portion, the projection of the pressure relief component 24 is entirely located within the clearance portion 231.

[0158] In this embodiment, by setting the projection of the pressure relief component 24 in the thickness direction X of the wall portion to be entirely located within the avoidance portion 231, the avoidance portion 231 can avoid the entire pressure relief component 24. This is beneficial to further improve the effect of the insulating component 23 in avoiding the portion of the pressure relief component 24 that protrudes from the first surface 2112, thereby further alleviating the interference between the pressure relief component 24 and the insulating component 23 or other components, and improving the assembly quality of the battery cell 20.

[0159] According to some embodiments of this application, referring to Figures 5, 6 and 7, along the thickness direction X of the wall, the pressure relief component 24 has a second surface 242 and a third surface 243 facing each other. The third surface 243 is disposed facing the electrode assembly 22. The second surface 242 is provided with a first groove 244. The pressure relief component 24 has a first protrusion 245 protruding from the third surface 243 at a position corresponding to the first groove 244. The first protrusion 245 is provided with a pressure relief groove 241. The pressure relief component 24 is configured to be able to split at least a portion along the pressure relief groove 241 when the battery cell 20 is depressurized, so as to release the internal pressure of the battery cell 20. At least a portion of the first protrusion 245 protrudes from the first surface 2112.

[0160] The pressure relief component 24 has a second surface 242 and a third surface 243 facing each other. The third surface 243 is disposed facing the electrode assembly 22. That is, the pressure relief component 24 has a third surface 243 facing the electrode assembly 22 and a second surface 242 facing away from the electrode assembly 22 in the thickness direction X of the wall portion.

[0161] The second surface 242 is provided with a first groove 244, and the pressure relief component 24 is provided with a first protrusion 245 protruding from the third surface 243 at a position corresponding to the first groove 244. That is, the pressure relief component 24 has a structure in which the first groove 244 is formed on the second surface 242 and the first protrusion 245 is provided on the third surface 243, so that the pressure relief component 24 is a structure that can be formed by stamping with one side concave and the other side convex.

[0162] The first protrusion 245 is provided with a pressure relief groove 241. The pressure relief component 24 is configured to be able to split at least part of the pressure relief groove 241 when the battery cell 20 is depressurized. That is, the weak structure formed by the pressure relief groove 241 of the pressure relief component 24 is located on the first protrusion 245. Optionally, the pressure relief groove 241 may be provided on the bottom wall of the first groove 244 or on the bottom wall of the first groove 244.

[0163] At least a portion of the first protrusion 245 protrudes from the first surface 2112. That is, the first protrusion 245 formed by the pressure relief component 24 protrudes from the wall portion 211 facing the electrode assembly 22. Specifically, the pressure relief component 24 forms the first protrusion 245 during the processing of the pressure relief groove 241. The first protrusion 245 is located on the side of the pressure relief component 24 facing the electrode assembly 22 in the thickness direction X of the wall portion, and protrudes from the first surface 2112 of the wall portion 211 facing the electrode assembly 22. The first groove 244, the first protrusion 245, and the pressure relief groove 241 are all structures formed by a stamping process.

[0164] In this embodiment, the pressure relief component 24 has a concave-convex structure with a first groove 244 formed on one side and a first protrusion 245 formed on the other side. The pressure relief groove 241 for pressure relief is provided on the first protrusion 245. The pressure relief component 24 has a structure in which the first protrusion 245 protrudes from the first surface 2112 and is accommodated in the clearance portion 231 of the insulating member 23. The battery cell 20 with this structure is convenient for processing the pressure relief groove 241 on the pressure relief component 24, which is beneficial to improving the material flow pattern of the pressure relief component 24 during the process of forming the pressure relief groove 241, thereby improving the processing quality of the pressure relief component 24 and improving the pressure relief component 24 for setting pressure relief. The structural strength of the area of ​​the groove 241 can alleviate the deformation of the pressure relief component 24 during use. On the other hand, by setting at least a portion of the first protrusion 245 of the pressure relief component 24 to be accommodated in the relief portion 231, the insulating member 23 can avoid the first protrusion 245, which helps to alleviate the interference between the first protrusion 245 and the insulating member 23 or other components. The insulating member 23 can also provide a certain degree of protection for the first protrusion 245 with the pressure relief groove 241, so as to reduce the wear or damage of the first protrusion 245 during assembly, thereby helping to reduce the premature opening of the valve and pressure relief of the pressure relief component 24.

[0165] According to some embodiments of this application, as shown in Figures 5, 6 and 7, along the thickness direction X of the wall portion, the insulating member 23 has a fourth surface 232 that abuts against the first surface 2112, and the clearance portion 231 includes a second groove 2311. The second groove 2311 is recessed from the fourth surface 232 toward the electrode assembly 22 to form a second protrusion 233 on the side of the insulating member 23 facing the electrode assembly 22 and at a position corresponding to the second groove 2311. The second protrusion 233 abuts against the electrode assembly 22, and the second groove 2311 accommodates at least a portion of the first protrusion 245.

[0166] Along the thickness direction X of the wall portion, the insulating member 23 has a fourth surface 232 that abuts against the first surface 2112. That is, the insulating member 23 has a fourth surface 232 facing the wall portion 211 in the thickness direction X of the wall portion, and the fourth surface 232 is the surface of the insulating member 23 that abuts against the first surface 2112 of the wall portion 211.

[0167] The second groove 2311 is recessed from the fourth surface 232 toward the electrode assembly 22, so that a second protrusion 233 is formed on the side of the insulating member 23 facing the electrode assembly 22 and at the position corresponding to the second groove 2311. That is, the clearance portion 231 includes at least the second groove 2311 provided on the fourth surface 232 of the insulating member 23, and the insulating member 23 has a second protrusion 233 formed on the side away from the wall portion 211 and at the position corresponding to the second groove 2311, so that the insulating member 23 has a structure in which the second groove 2311 is formed on one side and the second protrusion 233 is formed on the other side.

[0168] The second protrusion 233 abuts against the electrode assembly 22. That is, the second protrusion 233 and the electrode assembly 22 abut against each other in the thickness direction X of the wall. It should be noted that the second protrusion 233 abuts against the area of ​​the electrode assembly 22 where the tab 221 is not provided in the thickness direction X of the wall.

[0169] The second groove 2311 accommodates at least a portion of the first protrusion 245. That is, the clearance portion 231 includes the second groove 2311 disposed on the fourth surface 232 of the insulating member 23. If the clearance portion 231 only includes the second groove 2311, then the first protrusion 245 has a structure where its projection in the thickness direction X of the wall portion is located within the second groove 2311. If the clearance portion 231 also includes other grooves, then the second groove 2311 and the other grooves of the clearance portion 231 can together form a structure similar to the first protrusion 245. For example, in Figures 5 and 6, the clearance portion 231 includes the second groove 2311 and a third groove 2312 penetrating the sidewall of the second groove 2311. The third groove 2312 and the second groove 2311 cooperate to clearance the first protrusion 245.

[0170] In this embodiment, a second groove 2311 for accommodating at least a portion of the first protrusion 245 is provided on the fourth surface 232 of the insulating member 23, and a second protrusion 233 abutting against the electrode assembly 22 is formed on the side of the insulating member 23 away from the fourth surface 232 and at a position corresponding to the second groove 2311. This structure, which provides a groove on the insulating member 23, avoids at least a portion of the first protrusion 245. The structure is simple and easy to implement. In addition, while the insulating member 23 avoids at least a portion of the first protrusion 245, the second protrusion 233 of the insulating member 23 can also abut against the electrode assembly 22. This is beneficial to improving the stability and reliability of the electrode assembly 22 and the insulating member 23 assembled in the housing 21, thereby reducing the phenomenon of shaking or displacement of the insulating member 23 and the electrode assembly 22 during use.

[0171] In some embodiments, as shown in Figures 5 and 6, the second protrusion 233 is provided with a through hole 2331, which communicates with the second groove 2311. That is, the through hole 2331 is a structure that penetrates the bottom wall of the second groove 2311.

[0172] For example, in FIG6, the second protrusion 233 is provided with a plurality of through holes 2331, and the plurality of through holes 2331 are arranged at intervals.

[0173] In this embodiment, by providing a through hole 2331 on the second protrusion 233 that communicates with the second groove 2311, the space on the side of the insulating member 23 facing the electrode assembly 22 can communicate with the second groove 2311 of the insulating member 23, which is used to avoid the first protrusion 245, through the through hole 2331. This allows the gas inside the casing 21 to pass through the through hole 2331 into the second groove 2311 and then be discharged to the outside of the casing 21 through the pressure relief component 24 when the battery cell 20 is depressurized. This improves the smoothness of internal venting when the battery cell 20 is depressurized, thereby effectively increasing the depressurization rate of the battery cell 20 and reducing the risk of explosion or bursting caused by untimely depressurization of the battery cell 20, thus improving the reliability of the battery cell 20.

[0174] According to some embodiments of this application, please continue to refer to Figures 5 and 6. The clearance portion 231 may further include a third groove 2312, which is recessed from the fourth surface 232 toward the electrode assembly 22 and penetrates the sidewall of the second groove 2311. Along the thickness direction X of the wall portion, the bottom surface of the third groove 2312 is closer to the wall portion 211 than the bottom surface of the second groove 2311. The second groove 2311 accommodates a portion of the first protrusion 245, and the third groove 2312 accommodates the portion of the first protrusion 245 located outside the second groove 2311.

[0175] The third groove 2312 is recessed from the fourth surface 232 toward the electrode assembly 22, and the third groove 2312 penetrates the side of the second groove 2311. That is, the third groove 2312 is a groove structure provided on the fourth surface 232 of the insulating member 23, and the side of the third groove 2312 and the side of the second groove 2311 are interconnected, so that the third groove 2312 and the second groove 2311 are connected to each other, and the third groove 2312 is a structure that further expands the side of the second groove 2311.

[0176] Along the thickness direction X of the wall, the bottom surface of the third groove 2312 is closer to the wall 211 than the bottom surface of the second groove 2311. In other words, the groove depth of the third groove 2312 in the thickness direction X of the wall is less than the groove depth of the second groove 2311 in the thickness direction X of the wall.

[0177] The second groove 2311 accommodates a portion of the first protrusion 245, and the third groove 2312 accommodates a portion of the first protrusion 245 located outside the second groove 2311. In other words, the second groove 2311 and the third groove 2312 work together to avoid the first protrusion 245 of the pressure relief component 24. Specifically, a portion of the projection of the first protrusion 245 in the thickness direction X of the wall is located in the second groove 2311, and the other portion is located in the third groove 2312.

[0178] In this embodiment, a third groove 2312 is further provided on the fourth surface 232 of the insulating member 23. The third groove 2312 is a structure that penetrates the side surface of the second groove 2311, and the bottom surface of the third groove 2312 is closer to the wall 211 in the thickness direction X of the wall portion than the bottom surface of the second groove 2311, so that the groove depth of the third groove 2312 is less than the groove depth of the second groove 2311, and the third groove 2312 is a structure that further expands on the side surface of the second groove 2311, so that the third groove 2312 and the second groove 2311 are more spacious. 1. The insulating component 23 with this structure can avoid the first protrusion 245 by locally expanding the second groove 2311 to form the third groove 2312. This eliminates the need to expand the area of ​​the second groove 2311 on the insulating component 23, thereby reducing the volume of the second protrusion 233 corresponding to the second groove 2311. This helps to save space occupied by the insulating component 23, improve the internal space utilization of the battery cell 20, and reduce the processing difficulty and cost of the insulating component 23.

[0179] In some embodiments, referring to FIG5, the minimum distance between the bottom surface of the third groove 2312 and the first protrusion 245 along the thickness direction X of the wall is D1, which satisfies 0.1mm≤D1≤1.5mm.

[0180] For example, the minimum distance D1 between the bottom surface of the third groove 2312 and the first protrusion 245 can be 0.1mm, 0.12mm, 0.13mm, 0.15mm, 0.18mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, or 1.5mm, etc.

[0181] In this embodiment, by setting the minimum distance between the bottom surface of the third groove 2312 and the first protrusion 245 in the thickness direction X of the wall to be greater than or equal to 0.1 mm, it is beneficial to further improve the avoidance effect of the avoidance portion 231 of the insulating member 23 on the first protrusion 245, so as to reduce the phenomenon of the insulating member 23 interfering with or wearing the first protrusion 245, thereby further improving the assembly quality of the battery cell 20. In addition, by setting the minimum distance between the bottom surface of the third groove 2312 and the first protrusion 245 in the thickness direction X of the wall to be less than or equal to 1.5 mm, the phenomenon of space waste caused by the excessive gap between the bottom surface of the third groove 2312 and the first protrusion 245 is alleviated, which is beneficial to improve the internal space utilization rate of the battery cell 20.

[0182] According to some embodiments of this application, referring to Figures 8, 9, 10, and 11, Figure 8 is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application, Figure 9 is a cross-sectional view of the battery cell 20 provided in some embodiments of this application, Figure 10 is a partial enlarged view of point A of the battery cell 20 shown in Figure 9, and Figure 11 is an exploded view of the structure of the insulating member 23 of the battery cell 20 provided in some embodiments of this application. The insulating member 23 may include a body portion 234 and an abutment portion 235. The body portion 234 is disposed between the wall portion 211 and the electrode assembly 22 along the thickness direction X of the wall portion. The abutment portion 235 is connected to the side of the body portion 234 facing the wall portion 211, and the abutment portion 235 abuts against the first surface 2112. Along the thickness direction X of the wall portion, the projection of the abutment portion 235 does not overlap with the projection of the first protrusion 245, so as to form a gap space between the body portion 234 and the first surface 2112, the gap space being a clearance portion 231.

[0183] The body portion 234 is disposed between the wall portion 211 and the electrode assembly 22 along the thickness direction X of the wall portion. In other words, the body portion 234 of the insulating member 23 is the part of the insulating member 23 that provides insulation and isolation between the wall portion 211 and the electrode assembly 22.

[0184] The abutment portion 235 is connected to the side of the body portion 234 facing the wall portion 211, and the abutment portion 235 abuts against the first surface 2112. That is to say, the abutment portion 235 is a structure that supports the body portion 234 and the wall portion 211 in the thickness direction X of the wall portion.

[0185] Along the thickness direction X of the wall portion, the projection of the abutment portion 235 does not overlap with the projection of the first protrusion 245, so as to form a gap space between the body portion 234 and the first surface 2112. That is, the abutment portion 235 of the insulating member 23 does not cover the first protrusion 245 in the thickness direction X of the wall portion, so that the body portion 234 of the insulating member 23 and the first surface 2112 of the wall portion 211 are arranged to be spaced apart from each other and form a gap space. This gap space is the avoidance portion 231 of the insulating member 23 for avoiding the first protrusion 245.

[0186] Optionally, there may be one or more abutment portions 235 connected to the side of the body portion 234 facing the wall portion 211. Similarly, the structure by which the abutment portion 235 is connected to the body portion 234 may be varied, such as adhesive bonding, snap-fit ​​bonding, or heat-fusion bonding.

[0187] In some embodiments, as shown in FIG11, a positioning hole 2341 may also be provided on the body portion 234. The positioning hole 2341 penetrates the body portion 234 along the thickness direction X of the wall portion. The positioning hole 2341 plays a positioning role in the process of assembling the insulating member 23 into the housing 21, so as to reduce the difficulty of assembling the insulating member 23 into the housing 21 and improve the accuracy of assembling the insulating member 23 into the housing 21.

[0188] For example, the main body 234 is provided with two positioning holes 2341, which are spaced apart on the main body 234. It should be noted that if the abutting part 235 is connected to the area of ​​the main body 234 where the positioning holes 2341 are provided, the abutting part 235 is also provided with a notch or channel in the thickness direction X of the wall corresponding to the position of the positioning hole 2341 to avoid the positioning hole 2341.

[0189] In this embodiment, the insulating member 23 is provided with a body portion 234 and an abutment portion 235 connected to the side of the body portion 234 facing the wall portion 211. By abutting the abutment portion 235 against the first surface 2112 of the wall portion 211, and ensuring that the projection of the abutment portion 235 in the thickness direction X of the wall portion does not overlap with the first protrusion 245 of the pressure relief member 24, the abutment portion 235 is a structure supported between the body portion 234 and the wall portion 211. This makes the body portion 234 and the wall portion 211 of the insulating member 23 spaced apart in the thickness direction X of the wall portion. This allows the formation of a space between the body portion 234 and the first surface 2112 of the wall portion 211 to avoid the first protrusion 245 of the pressure relief member 24, thus forming an avoidance portion 231 for avoiding the first protrusion 245. The structure is simple and easy to assemble.

[0190] In some embodiments, as shown in FIG11, the insulating member 23 includes a plurality of abutment portions 235, all of which are connected to the side of the body portion 234 facing the wall portion 211, and the plurality of abutment portions 235 are spaced apart.

[0191] For example, the body portion 234 has two abutment portions 235 connected to the side of the wall portion 211 in the thickness direction X of the wall portion. The two abutment portions 235 are arranged at intervals in a direction perpendicular to the thickness direction X of the wall portion, and the two abutment portions 235 are respectively located on both sides of the first protrusion 245 in the direction perpendicular to the thickness direction X of the wall portion. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the insulating member 23 may also be provided with three, four, five, six or seven abutment portions 235.

[0192] In this embodiment, by connecting multiple abutment portions 235 to the side of the main body portion 234 facing the wall portion 211, and arranging the multiple abutment portions 235 at intervals, the structural stability of the insulating member 23 assembled between the electrode assembly 22 and the wall portion 211 can be further improved, and the effect of the multiple abutment portions 235 supporting the main body portion 234 can be improved, thereby improving the overall structural strength of the insulating member 23. This can reduce the phenomenon of deformation or collapse of the main body portion 234 during use, thereby alleviating the phenomenon of interference between the main body portion 234 and the first protrusion 245 of the pressure relief component 24 after deformation, and thus further improving the effect of the insulating member 23 avoiding the first protrusion 245 of the pressure relief component 24.

[0193] In some embodiments, referring to FIG10, the minimum distance between the body portion 234 and the first protrusion 245 along the thickness direction X of the wall portion is D2, which satisfies 0.1mm≤D2≤1.5mm.

[0194] For example, the minimum distance D2 between the body portion 234 and the first protrusion 245 can be 0.1mm, 0.12mm, 0.13mm, 0.15mm, 0.18mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, or 1.5mm, etc.

[0195] In this embodiment, by setting the minimum distance between the body portion 234 and the first protrusion 245 in the thickness direction X of the wall portion to be greater than or equal to 0.1 mm, it is beneficial to further improve the avoidance effect of the avoidance portion 231 of the insulating member 23 on the first protrusion 245, so as to reduce the phenomenon of the body portion 234 of the insulating member 23 interfering with or wearing the first protrusion 245, thereby further improving the assembly quality of the battery cell 20. In addition, by setting the minimum distance between the body portion 234 and the first protrusion 245 in the thickness direction X of the wall portion to be less than or equal to 1.5 mm, the phenomenon of space waste caused by excessive spacing between the body portion 234 and the first protrusion 245 is alleviated, which is beneficial to improve the internal space utilization rate of the battery cell 20.

[0196] According to some embodiments of this application, referring to Figures 5 and 7, the wall portion 211 is provided with a pressure relief hole 2111, and the pressure relief component 24 is connected to the wall portion 211 and seals the pressure relief hole 2111. A first surface 2112 is provided with a mounting groove 2112a, and the pressure relief hole 2111 penetrates the bottom surface of the mounting groove 2112a. Along the thickness direction X of the wall portion, a portion of the pressure relief component 24 is accommodated within the mounting groove 2112a, and the second surface 242 abuts against the bottom surface of the mounting groove 2112a.

[0197] The pressure relief hole 2111 penetrates the bottom surface of the assembly groove 2112a, meaning that the pressure relief hole 2111 of the wall portion 211 is a structure provided on the bottom surface of the assembly groove 2112a.

[0198] The pressure relief component 24 is partially housed in the assembly groove 2112a, and the second surface 242 abuts against the bottom surface of the assembly groove 2112a. In other words, the pressure relief component 24 is partially assembled into the assembly groove 2112a of the wall portion 211, and the second surface 242 of the pressure relief component 24, which is provided with the first groove 244, abuts against the bottom surface of the assembly groove 2112a.

[0199] For example, the area of ​​the pressure relief component 24 where the first protrusion 245 is not formed is accommodated in the assembly groove 2112a. Of course, it is possible that a portion of the area of ​​the pressure relief component 24 where the first protrusion 245 is not formed is accommodated in the assembly groove 2112a, or the entire area of ​​the pressure relief component 24 where the first protrusion 245 is not formed is accommodated in the assembly groove 2112a.

[0200] In this embodiment, by providing an assembly groove 2112a for assembling the pressure relief component 24 on the first surface 2112 of the wall portion 211, the pressure relief hole 2111 is provided on the bottom surface of the assembly groove 2112a, and the second surface 242 of the pressure relief component 24 abuts against the bottom surface of the assembly groove 2112a, the battery cell 20 with this structure can improve the effect of the pressure relief component 24 in sealing the pressure relief hole 2111, which is beneficial to reducing the risk of leakage of the battery cell 20 during use. On the other hand, the assembly groove 2112a can play a certain limiting and positioning role for the pressure relief component 24, which is beneficial to improving the stability of the pressure relief component 24 assembled on the wall portion 211, and also helps to reduce the difficulty of connecting the pressure relief component 24 to the wall portion 211.

[0201] In some embodiments, as shown in FIG5, the first surface 2112 and the third surface 243 are coplanar. That is, the entire area of ​​the pressure relief component 24 where the first protrusion 245 is not formed is accommodated within the assembly groove 2112a, and the third surface 243 of the pressure relief component 24 where the first protrusion 245 is formed and the first surface 2112 of the wall portion 211 where the assembly groove 2112a is formed are flush with each other. In other words, the thickness of the area of ​​the pressure relief component 24 where the first protrusion 245 is not formed in the thickness direction X of the wall portion is equal to the groove depth of the assembly groove 2112a in the thickness direction X of the wall portion.

[0202] In this embodiment, by setting the first surface 2112 of the wall portion 211 and the third surface 243 of the pressure relief component 24, which has the first protrusion 245, as coplanar, the area of ​​the pressure relief component 24 without the first protrusion 245 is accommodated as a whole in the assembly groove 2112a. On the one hand, this can further improve the stability of the pressure relief component 24 assembled onto the wall portion 211, thereby improving the assembly quality of the battery cell 20. On the other hand, the assembly groove 2112a can also provide a certain degree of protection for the pressure relief component 24 and alleviate the interference between the area of ​​the pressure relief component 24 without the first protrusion 245 and the insulating component 23 or other components.

[0203] According to some embodiments of this application, referring to Figures 5 and 7, the first protrusion 245 includes a first sidewall 2451 and a first bottom wall 2452. The first sidewall 2451 surrounds the first bottom wall 2452 and is connected to the first bottom wall 2452. The first sidewall 2451 and the first bottom wall 2452 together define a first groove 244. The pressure relief groove 241 is disposed on the first bottom wall 2452.

[0204] The first sidewall 2451 of the first protrusion 245 is also the groove sidewall of the first groove 244, so that the first sidewall 2451 connects the first bottom wall 2452 and the part of the pressure relief component 24 where the first protrusion 245 is not formed. Correspondingly, the first bottom wall 2452 of the first protrusion 245 is also the groove bottom wall of the first groove 244, so that the first sidewall 2451 and the first bottom wall 2452 of the first protrusion 245 together enclose and define the structure of the first groove 244.

[0205] The pressure relief groove 241 is disposed on the first bottom wall 2452, that is, the pressure relief groove 241 is disposed on the bottom wall of the first groove 244. For example, in FIG7, the pressure relief groove 241 is disposed on the surface of the first bottom wall 2452 away from the electrode assembly 22, that is, the pressure relief groove 241 is disposed on the bottom surface of the first groove 244. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 can also have other structures. For example, the pressure relief groove 241 can also be disposed on the surface of the first bottom wall 2452 facing the electrode assembly 22.

[0206] In this embodiment, the first protrusion 245 includes a first sidewall 2451 and a first bottom wall 2452. The first sidewall 2451 surrounds the first bottom wall 2452 so that the first sidewall 2451 and the first bottom wall 2452 of the first protrusion 245 together define the first groove 244. By setting the pressure relief groove 241 on the first bottom wall 2452 of the first protrusion 245, the pressure relief groove 241 is a structure set on the bottom wall of the first groove 244. The pressure relief component 24 with this structure is convenient to process the pressure relief groove 241 on the first protrusion 245, which helps to reduce the processing difficulty of the pressure relief groove 241. On the other hand, the first sidewall 2451 can also absorb and buffer part of the stress transmitted from the wall 211 to the pressure relief component 24, so as to reduce the stress influence on the area of ​​the first protrusion 245 where the pressure relief groove 241 is set, which helps to improve the reliability and stability of the pressure relief component 24.

[0207] According to some embodiments of this application, referring to FIG7, the first bottom wall 2452 may include a main body portion 2452a and an arched portion 2452b. The main body portion 2452a connects the arched portion 2452b and the first side wall 2451, and the main body portion 2452a surrounds the outside of the arched portion 2452b. Along the thickness direction X of the wall portion, the arched portion 2452b arches from the main body portion 2452a in a direction away from the electrode assembly 22, so as to form a fourth groove 2452c on the side of the first bottom wall 2452 facing the electrode assembly 22 and corresponding to the position of the arched portion 2452b. A pressure relief groove 241 is provided on the main body portion 2452a.

[0208] The first bottom wall 2452 is partially arched in the thickness direction X of the wall portion in a direction away from the electrode assembly 22 to form an arched portion 2452b. The area of ​​the first bottom wall 2452 that is not arched and connects the first side wall 2451 and the arched portion 2452b is the main body portion 2452a. Thus, the main body portion 2452a is an annular structure surrounding the outside of the arched portion 2452b. The first bottom wall 2452 forms a fourth groove 2452c on the side facing the electrode assembly 22 and at the position corresponding to the arched portion 2452b.

[0209] The pressure relief groove 241 is provided in the main body 2452a, that is, the pressure relief groove 241 is located between the arched part 2452b and the first side wall 2451.

[0210] It should be noted that the first groove 244, the first protrusion 245, the pressure relief groove 241, and the arch 2452b of the pressure relief component 24 are all structures formed by stamping process, so that the pressure relief component 24 has a structure that protrudes to both sides in the thickness direction X of the wall, so as to facilitate the material flow pattern during the stamping process of the pressure relief groove 241 and reduce the stamping difficulty of the pressure relief groove 241.

[0211] In this embodiment, by setting a portion of the first bottom wall 2452 of the first protrusion 245 to be arched in the direction away from the electrode assembly 22, the first bottom wall 2452 is formed with an arched portion 2452b and a main body portion 2452a surrounding the outside of the arched portion 2452b and connecting the arched portion 2452b with the first side wall 2451. By setting the pressure relief groove 241 on the main body portion 2452a, on the one hand, the difficulty of processing the pressure relief groove 241 on the first bottom wall 2452 can be reduced, and the material flow pattern of the first bottom wall 2452 during the process of forming the pressure relief groove 241 can be improved, thereby improving the processing quality of the pressure relief component 24. On the other hand, the structural strength of the first bottom wall 2452 can be further improved, which can help alleviate the deformation of the pressure relief component 24 during use, thereby improving the reliability and stability of the pressure relief component 24.

[0212] In some embodiments, as shown in FIG7, the pressure relief groove 241 is disposed around the arched portion 2452b. That is, the pressure relief groove 241 is an annular groove structure, and the pressure relief groove 241 surrounds the outside of the arched portion 2452b. Of course, the structure of the pressure relief groove 241 is not limited to this. In other embodiments, the pressure relief groove 241 may also be an arc-shaped groove structure or a strip-shaped groove structure.

[0213] In this embodiment, by setting the pressure relief groove 241 as an annular structure surrounding the arched portion 2452b, the pressure relief component 24 can completely detach from the area where the arched portion 2452b is formed on the first bottom wall 2452 after the entire structure of the pressure relief groove 241 is cracked when the battery cell 20 is depressurized. This helps to expand the pressure relief area of ​​the battery cell 20, thereby further improving the pressure relief rate of the battery cell 20, reducing the risk of explosion or bursting caused by untimely pressure relief of the battery cell 20, and thus effectively improving the reliability of the battery cell 20.

[0214] In some embodiments, as shown in Figures 5 and 7, a pressure relief groove 241 is provided on the side of the main body 2452a away from the electrode assembly 22 along the thickness direction X of the wall portion.

[0215] In this embodiment, by setting the pressure relief groove 241 on the side of the main body 2452a of the first bottom wall 2452 away from the electrode assembly 22, the pressure relief groove 241 is formed on the bottom surface of the first groove 244, thereby reducing the difficulty of forming the pressure relief groove 241 on the main body 2452a of the first bottom wall 2452. This facilitates the formation of the pressure relief groove 241 while forming the first groove 244 and the arch 2452b, thereby improving the processing efficiency of the pressure relief component 24.

[0216] In some embodiments, the pressure relief groove 241 is stamped onto the main body 2452a.

[0217] In this embodiment, by setting the pressure relief groove 241 as a structure formed by stamping on the main body 2452a of the first bottom wall 2452, the manufacturing difficulty of the pressure relief groove 241 can be reduced, which is conducive to improving the processing efficiency of the pressure relief groove 241. On the other hand, in the structure in which the pressure relief component 24 has a first groove 244 and a first protrusion 245, and the first bottom wall 2452 of the first protrusion 245 has an arched portion 2452b, the material flow of the pressure relief groove 241 during the stamping process is facilitated, which is conducive to improving the processing consistency of the pressure relief groove 241 and thus improving the production quality of the pressure relief component 24.

[0218] According to some embodiments of this application, as shown in Figures 4 and 5, the pressure relief component 24 is separately disposed from the wall portion 211, and the pressure relief component 24 is welded to the wall portion 211. That is, the pressure relief component 24 and the wall portion 211 are separate structures, the pressure relief component 24 and the wall portion 211 are independent components, and the pressure relief component 24 is connected to the wall portion 211 by welding.

[0219] In one embodiment where the pressure relief component 24 has a first protrusion 245, the area of ​​the pressure relief component 24 where the first protrusion 245 is not formed is welded to the wall portion 211. In another embodiment where an assembly groove 2112a is provided on the first surface 2112 of the wall portion 211, and the area of ​​the pressure relief component 24 where the first protrusion 245 is not formed is accommodated in the assembly groove 2112a, the area of ​​the pressure relief component 24 where the first protrusion 245 is not formed is welded to the side surface or bottom surface of the assembly groove 2112a.

[0220] In this embodiment, by welding the pressure relief component 24 to the wall portion 211, the difficulty of setting the pressure relief component 24 on the outer casing 21 can be reduced, thereby reducing the manufacturing difficulty of the battery cell 20. On the other hand, it is beneficial to improve the structural strength of the pressure relief component 24 connected to the wall portion 211, thereby improving the assembly stability between the pressure relief component 24 and the wall portion 211, and also improving the effect of the pressure relief component 24 in sealing the pressure relief hole 2111.

[0221] Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 can also have other structures. For example, the pressure relief component 24 is integrally formed with the wall portion 211, that is, the pressure relief component 24 and the wall portion 211 are an integral structure. The pressure relief component 24 is a structure formed by processing a local area on the wall portion 211 through an integral forming process, such as stamping.

[0222] In this embodiment, by setting the pressure relief component 24 and the wall portion 211 as an integrally formed structure, the battery cell 20 with this structure is able to improve the structural strength of the pressure relief component 24 connected to the wall portion 211, thereby reducing the risk of the pressure relief component 24 detaching from the wall portion 211 during use, and thus improving the stability of the battery cell 20 in use.

[0223] In some embodiments, the material of the housing 21 is the same as the material of the pressure relief component 24.

[0224] It should be noted that the statement that the material of the outer shell 21 is the same as that of the pressure relief component 24 means that the main components of the outer shell 21 and the pressure relief component 24 are the same. For example, if the outer shell 21 and the pressure relief component 24 are both made of a single material, such as copper or aluminum, then the outer shell 21 and the pressure relief component 24 are composed of the same metallic element. If the outer shell 21 and the pressure relief component 24 are made of an alloy or mixed material, such as aluminum alloy or steel, then the statement that the material of the outer shell 21 and the pressure relief component 24 is the same means that the main components of the outer shell 21 and the pressure relief component 24 are the same. If the outer shell 21 and the pressure relief component 24 differ only in the content of the components, then they are still made of the same material.

[0225] In this embodiment, by setting the material of the outer shell 21 and the material of the pressure relief component 24 to be the same, the pressure relief component 24 and the wall 211 are welded to the same material, thereby improving the welding quality between the pressure relief component 24 and the wall 211, further improving the assembly quality between the pressure relief component 24 and the wall 211, and further reducing the welding difficulty between the pressure relief component 24 and the wall 211.

[0226] According to some embodiments of this application, the outer casing 21 and the pressure relief component 24 are both made of steel.

[0227] For example, the materials of the outer casing 21 and the pressure relief component 24 can be low carbon steel, medium carbon steel or high carbon steel, etc.

[0228] In this embodiment, by using steel as the material for both the outer casing 21 and the pressure relief component 24, the structural strength of the outer casing 21 can be improved, thus mitigating the expansion and deformation of the outer casing 21 of the battery cell 20 during use. This helps reduce the stress impact on the pressure relief component 24 caused by the deformation of the outer casing 21. On the other hand, the overall structural strength of the pressure relief component 24 can be improved, thus mitigating deformation of the pressure relief component 24 during use. This reduces fatigue damage to the pressure relief component 24, thereby reducing the risk of premature valve opening and pressure relief in the battery cell 20, and improving the service life and reliability of the battery cell 20.

[0229] According to some embodiments of this application, as shown in Figures 3 and 4, the housing 21 may include a housing 212 and an end cap 213. The housing 212 forms a receiving cavity with an opening 2121 inside, and the electrode assembly 22 is received in the receiving cavity. The end cap 213 closes the opening 2121 and is a wall portion 211.

[0230] The end cap 213 is a wall portion 211, meaning that the pressure relief component 24 is disposed on the end cap 213, and the insulating component 23 is disposed between the end cap 213 and the electrode assembly 22, such that the insulating component 23 is a lower plastic disposed on the side of the end cap 213 facing the electrode assembly 22.

[0231] In this embodiment, by setting the wall portion 211 of the outer casing 21 as an end cap 213 for closing the opening 2121, the battery cell 20 with this structure is easy to assemble the pressure relief component 24 on the end cap 213, which helps to reduce the manufacturing difficulty of the battery cell 20 and improve the production efficiency of the battery cell 20.

[0232] Of course, the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, as shown in Figures 8 and 9, the housing 21 can include a housing 212 and an end cap 213. The housing 212 includes an integrally formed second bottom wall and a second side wall. The second side wall surrounds the second bottom wall. Along the thickness direction X of the wall portion, one end of the second side wall is connected to the second bottom wall, and the other end forms an opening 2121. The second bottom wall and the second side wall together define a receiving cavity. The electrode assembly 22 is received in the receiving cavity. The end cap 213 closes the opening 2121. The second bottom wall is a wall portion 211.

[0233] The shell 212 includes an integrally formed second bottom wall and a second side wall. That is, the second bottom wall and the second side wall of the shell 212 are structures formed by an integral forming process to form a receiving cavity with an opening 2121 inside the shell 212, such as by a stamping process or a casting process.

[0234] The second bottom wall is wall 211, that is, the pressure relief component 24 is disposed on the second bottom wall of the housing 212, and the insulating component 23 is disposed between the second bottom wall of the housing 212 and the electrode assembly 22, such that the insulating component 23 is a bottom support plate disposed on the side of the second bottom wall of the housing 212 facing the electrode assembly 22.

[0235] In this embodiment, by setting the wall portion 211 of the outer casing 21 as the second bottom wall of the casing 212 opposite to the end cap 213 in the thickness direction X of the wall portion, the battery cell 20 with this structure can ensure that the area of ​​the outer casing 21 where the pressure relief component 24 is provided is far away from the end cap 213. This can effectively alleviate the phenomenon that the stress generated by the connection between the end cap 213 and the casing 212 acts on the pressure relief component 24, thereby reducing the impact on the pressure relief component 24. This helps to reduce the risk of cracking or structural strength reduction of the pressure relief component 24 under the tensile stress, thereby improving the service life and reliability of the battery cell 20.

[0236] According to some embodiments of this application, this application also provides a battery 100, which includes a battery cell 20 of any of the above schemes.

[0237] As shown in Figure 2, the battery 100 may also include a housing 10, in which the battery cells 20 are housed.

[0238] 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.

[0239] 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.

[0240] 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, the box 10 is a cuboid structure.

[0241] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, in Figure 2, the housing 100 of the battery 100 contains multiple battery cells 20. These multiple battery cells 20 can be connected in series, parallel, or a combination thereof. A combination thereof means that some of the multiple battery cells 20 are connected in series and others in parallel. Multiple battery cells 20 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or a combination thereof to form a battery module, and then these battery modules are connected in series, parallel, or a combination thereof to form a whole, which is then housed within the housing 10.

[0242] The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0243] It should be noted that in some embodiments, the battery 100 may not have a housing 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of multiple battery cells 20 can be directly mounted onto an 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.

[0244] 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.

[0245] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 20.

[0246] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0247] 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

A battery cell comprises: a housing having a wall portion provided with a pressure relief component configured to release internal pressure of the battery cell; an electrode assembly accommodated in the housing; and an insulation member provided on a side of the wall portion facing the electrode assembly, the insulation member being configured to insulate and separate the wall portion and the electrode assembly; wherein, along a thickness direction of the wall portion, the wall portion has a first surface facing the electrode assembly, at least a portion of the pressure relief component protrudes from the first surface, and a relief portion is formed on a side of the insulation member facing the wall portion, the relief portion accommodating the portion of the pressure relief component protruding from the first surface. The pressure relief component is provided integrally with the wall portion and connected thereto, and along the thickness direction of the wall portion, a projection of the pressure relief component is entirely located in the relief portion. The battery cell of claim 1, wherein, Along the thickness direction of the wall portion, the pressure relief component has opposite second and third surfaces, the third surface is provided facing the electrode assembly, the second surface is provided with a first groove, a first protrusion protruding from the third surface is formed at a position of the pressure relief component corresponding to the first groove, the first protrusion is provided with a pressure relief groove, and the pressure relief component is configured to be split along at least a portion of the pressure relief groove to release the internal pressure of the battery cell when the battery cell is relieved of pressure; The battery cell according to claim 1 or 2, wherein, wherein at least a portion of the first protrusion protrudes from the first surface. Along the thickness direction of the wall portion, the insulation member has a fourth surface abutting the first surface, the relief portion includes a second groove recessed from the fourth surface in a direction close to the electrode assembly to form a second protrusion at a position of the side of the insulation member facing the electrode assembly and corresponding to the second groove, and the second protrusion abuts the electrode assembly; The battery cell of claim 3, wherein, wherein the second groove accommodates at least a portion of the first protrusion. The second protrusion is provided with a through hole in communication with the second groove. The battery cell of claim 4, wherein, The relief portion further includes a third groove recessed from the fourth surface in a direction close to the electrode assembly and penetrating a groove side surface of the second groove; The battery cell according to claim 4 or 5, wherein wherein along the thickness direction of the wall portion, a groove bottom surface of the third groove is closer to the wall portion than a groove bottom surface of the second groove, the second groove accommodates a portion of the first protrusion, and the third groove accommodates a portion of the first protrusion outside the second groove. Along the thickness direction of the wall portion, a minimum distance between the groove bottom surface of the third groove and the first protrusion is D1, and 0.1 mm≤D1≤1.5 mm is satisfied. The battery cell of claim 6, wherein, The insulation member comprises: The battery cell of claim 3, wherein a body portion provided between the wall portion and the electrode assembly along the thickness direction of the wall portion; an abutting portion connected to a side of the body portion facing the wall portion and abutting the first surface; wherein along the thickness direction of the wall portion, a projection of the abutting portion does not overlap a projection of the first protrusion to form a spacing space between the body portion and the first surface, and the spacing space is the relief portion. ​ The battery cell of claim 8, wherein, The insulating member includes a plurality of abutting portions, each of which is connected to one side of the body portion facing the wall portion. The battery cell according to claim 8 or 9, wherein The minimum distance between the body portion and the first protrusion in the thickness direction of the wall portion is D2, satisfying 0.1 mm≤D2≤1.5 mm. The battery cell of any one of claims 3-10, wherein, The wall portion is provided with a pressure relief hole, and the pressure relief component is connected to the wall portion and blocks the pressure relief hole. The first surface is provided with a fitting groove, the pressure relief hole penetrates the groove bottom surface of the fitting groove, and part of the pressure relief component is accommodated in the fitting groove in the thickness direction of the wall portion, and the second surface abuts against the groove bottom surface of the fitting groove. The battery cell of claim 11, wherein, The first surface is coplanar with the third surface. The battery cell of any one of claims 3-12, wherein, The first protrusion includes a first side wall and a first bottom wall, the first side wall surrounds the first bottom wall, and the first side wall is connected to the first bottom wall, and the first side wall and the first bottom wall jointly define the first groove, and the pressure relief groove is arranged on the first bottom wall. The battery cell of claim 13, wherein, The first bottom wall includes a main body portion and an arch portion, the main body portion connects the arch portion and the first side wall, and the main body portion surrounds the outside of the arch portion. In the thickness direction of the wall portion, the arch portion arches away from the electrode assembly from the main body portion to form a fourth groove on the side of the first bottom wall facing the electrode assembly and corresponding to the position of the arch portion, and the pressure relief groove is arranged on the main body portion. The battery cell of claim 14, wherein, The pressure relief groove surrounds the arch portion. The battery cell according to claim 14 or 15, wherein In the thickness direction of the wall portion, the pressure relief groove is arranged on the side of the main body portion away from the electrode assembly. The battery cell of any one of claims 14-16, wherein, The pressure relief groove is stamped and formed on the main body portion. The battery cell of any one of claims 1-17, wherein, The pressure relief component is separately arranged with the wall portion, and the pressure relief component is welded to the wall portion. The battery cell of claim 18, wherein, The material of the shell is the same as that of the pressure relief component. The battery cell of any one of claims 1-17, wherein, The pressure relief component is integrally formed with the wall portion. The battery cell of any one of claims 1-20, wherein, The material of the shell and the material of the pressure relief component are both steel. The battery cell of any one of claims 1-21, wherein, The shell includes: A shell body, an accommodating cavity with an opening is formed inside, and the electrode assembly is accommodated in the accommodating cavity; An end cover, which closes the opening; The end cover is the wall portion. The battery cell of any one of claims 1-21, wherein, The shell includes: A shell body, which integrally forms a second bottom wall and a second side wall, the second side wall surrounds the second bottom wall, one end of the second side wall is connected to the second bottom wall in the thickness direction of the wall portion, and the other end is closed to form an opening, the second bottom wall and the second side wall jointly define an accommodating cavity, and the electrode assembly is accommodated in the accommodating cavity; An end cover, which closes the opening; The second bottom wall is the wall portion. A battery includes the battery cell of any one of claims 1-23. An electric device includes the battery cell of any one of claims 1-23, which is used to provide electric energy.

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