Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly, an insulating part and a pressure relief part, the case has a wall portion provided with a pressure relief member configured to release internal pressure of the battery cells. The electrode assembly is housed within the housing. The insulator is disposed on a side of the wall portion facing the electrode assembly. In the thickness direction of the wall part, the wall part is provided with a first surface facing the electrode assembly, at least part of the pressure relief component protrudes out of the first surface, an avoiding part is formed on the side, facing the wall part, of the insulating part, and the avoiding part accommodates the part, protruding out of the first surface, of the pressure relief component. The insulating part is arranged on the first surface, so that the insulating part can avoid the part, protruding out of the first surface, of the pressure relief component, interference between the pressure relief component and the insulating part is relieved, the pressure relief component can be protected to a certain degree, and the phenomenon that the pressure relief component is abraded or damaged is reduced.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. In battery technology, in order to ensure the safety of battery cells, a pressure relief component for releasing the internal pressure of the battery cells is generally provided on the outer shell of the battery cells, so that when the internal pressure or temperature of the battery cells reaches a threshold, the pressure relief component can be actuated to release the pressure inside the battery cells. However, the existing pressure relief components of battery cells are prone to interference with other components inside the battery cells during the assembly process, resulting in poor assembly quality of the battery cells, which is not conducive to improving the production quality of the battery cells. Utility Model Content

[0003] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the production quality of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly, an insulating member and a pressure relief member; the shell has a wall portion, the wall portion is provided with a pressure relief member, and the pressure relief member is configured to release the internal pressure of the battery cell; the electrode assembly is accommodated in the shell; the insulating member is arranged on a 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; 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 avoidance portion is formed on the side of the insulating member facing the wall portion, and the avoidance portion accommodates a portion of the pressure relief member protruding from the first surface.

[0005] In the above technical solution, a relief portion for accommodating the portion of the pressure relief component protruding from the first surface is provided on the side of the insulating part facing the wall, so that the insulating part can avoid the portion of the pressure relief component protruding from the first surface. On the one hand, it can alleviate the interference between the pressure relief component and the insulating part or other parts to improve 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 in the relief portion of the insulating part, the insulating part can also play a certain protective role on the pressure relief component, so as to reduce the wear or damage of the pressure relief component during the assembly process, which is beneficial to improve the production quality of the battery cell.

[0006] In some embodiments, the pressure relief component is separately provided and connected to the wall portion. In the thickness direction of the wall portion, the projection of the pressure relief component is entirely located within the avoidance portion.

[0007] In the above technical solution, by setting the overall projection of the pressure relief component in the thickness direction of the wall portion to be located within the avoidance portion, the avoidance portion can avoid the entire pressure relief component, which is beneficial to further improving the effect of the insulating part avoiding the part of the pressure relief component protruding from the first surface, thereby further alleviating the interference between the pressure relief component and the insulating part or other components, and improving the assembly quality of the battery cell.

[0008] In some embodiments, in the thickness direction of the wall portion, the pressure relief component has opposite second and third surfaces. The third surface faces the electrode assembly, and a first groove is provided on the second surface. A first protrusion protruding from the third surface is formed at a position corresponding to the first groove of the pressure relief component. A pressure relief groove is provided on the first protrusion. The pressure relief component is configured to be able to crack along at least part of the pressure relief groove when the battery cell relieves pressure, so as to release the internal pressure of the battery cell; wherein, at least part of the first protrusion protrudes from the first surface.

[0009] In the above technical solution, the pressure relief component is an uneven structure with a first groove formed on one side and a first protrusion formed on the other side. The pressure relief groove for the pressure relief component to relieve pressure 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 avoidance portion of the insulating part. On the one hand, for the battery cell with this structure, it is convenient to process the pressure relief groove on the pressure relief component, which is beneficial to improving the material flow form during the process of forming the pressure relief groove on the pressure relief component, thereby improving the processing quality of the pressure relief component, and is beneficial to improving the structural strength of the area of the pressure relief component for setting the pressure relief groove, thereby alleviating phenomena such as deformation of the pressure relief component during use. On the other hand, by setting at least part of the first protrusion of the pressure relief component to be accommodated in the avoidance portion, the insulating part can avoid the first protrusion, which is beneficial to alleviating the interference between the first protrusion and the insulating part or other components, and enabling the insulating part to also play a certain protective role for the first protrusion provided with the pressure relief groove, so as to reduce the phenomenon of wear or damage of the first protrusion during the assembly process, thereby being beneficial to reducing phenomena such as premature valve opening and pressure relief of the pressure relief component.

[0010] In some embodiments, along the thickness direction of the wall portion, the insulating member has a fourth surface that abuts against the first surface. The avoidance portion includes a second groove that recesses from the fourth surface toward the electrode assembly, so as to form a second protrusion at a position on the side of the insulating member facing the electrode assembly and corresponding to the second groove. The second protrusion abuts against the electrode assembly. Wherein, at least a part of the first protrusion is received in the second groove.

[0011] In the above technical solution, a second groove for receiving at least a part of the first protrusion is provided on the fourth surface of the insulating member, and a second protrusion that abuts against the electrode assembly is formed on the side of the insulating member facing away from the fourth surface and corresponding to the second groove, so as to avoid at least a part of the first protrusion by providing a groove structure on the insulating member. The structure is simple and easy to implement. In addition, while the insulating member avoids at least a part of the first protrusion, the second protrusion of the insulating member can also abut against the electrode assembly, which is beneficial to improving the stability and reliability of the assembly of the electrode assembly and the insulating member in the housing, so as to reduce the phenomena such as shaking or displacement of the insulating member and the electrode assembly during use.

[0012] In some embodiments, the second protrusion is provided with a through hole that communicates with the second groove.

[0013] In the above technical solution, by providing a through hole on the second protrusion that communicates with the second groove, the space on the side of the insulating member facing the electrode assembly can communicate with the second groove of the insulating member for avoiding the first protrusion through the through hole. Thus, when the battery cell discharges pressure through the pressure relief component, the gas in the housing can easily enter the second groove through the through hole and then be discharged out of the housing through the pressure relief component, which is beneficial to improving the internal exhaust smoothness during the pressure relief of the battery cell, and further can effectively improve the pressure relief rate of the battery cell, and is beneficial to reducing the risk of explosion or bursting of the battery cell caused by untimely pressure relief, so as to improve the use reliability of the battery cell.

[0014] In some embodiments, the avoidance portion further includes a third groove that recesses from the fourth surface toward the electrode assembly, and the third groove penetrates through the side surface 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 receives a part of the first protrusion, and the third groove receives the part of the first protrusion located outside the second groove.

[0015] In the above technical solution, a third groove is further provided on the fourth surface of the insulating member. The third groove is a structure that penetrates the groove side surface of the second groove, and the groove bottom surface of the third groove is closer to the wall portion in the thickness direction of the wall portion than the groove bottom surface of the second groove, so that the groove depth of the third groove is smaller than the groove depth of the second groove, and the third groove is a structure that further expands on the groove side surface of the second groove, so that the third groove and the second groove can cooperate together to avoid the first protrusion. By adopting the insulating member with this structure, only by locally expanding the second groove to form the third groove on the basis of the second groove can the first protrusion be avoided, without expanding the area of the insulating member where the second groove is provided, thereby reducing the volume of the second protrusion corresponding to the second groove, which is beneficial to saving the space occupied by the insulating member and improving the internal space utilization rate of the battery cell, and can reduce the processing difficulty and processing cost of the insulating member.

[0016] In some embodiments, along the thickness direction of the wall portion, the minimum distance between the groove bottom surface of the third groove and the first protrusion is D1, satisfying 0.1 mm ≤ D1 ≤ 1.5 mm.

[0017] In the above technical solution, by setting the minimum distance between the groove bottom surface of the third groove and the first protrusion in the thickness direction 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 of the insulating member on the first protrusion, so as to reduce the phenomenon that the insulating member interferes with or wears the first protrusion, thereby further improving the assembly quality of the battery cell. In addition, by setting the minimum distance between the groove bottom surface of the third groove and the first protrusion in the thickness direction of the wall portion to be less than or equal to 1.5 mm, the phenomenon of space waste caused by too large a distance between the groove bottom surface of the third groove and the first protrusion is alleviated, which is beneficial to improving the internal space utilization rate of the battery cell.

[0018] In some embodiments, the insulating member includes a body portion and an abutting portion; the body portion is disposed between the wall portion and the electrode assembly along the thickness direction of the wall portion; the abutting portion is connected to the side of the body portion facing the wall portion, and the abutting portion abuts against the first surface; wherein, along the thickness direction of the wall portion, the projection of the abutting portion does not overlap with the projection of the first protrusion, so as to form a spaced space between the body portion and the first surface, and the spaced space is the avoidance portion.

[0019] In the above technical solution, the insulating member is provided with a body portion and an abutting portion connected to one side of the body portion facing the wall portion. By abutting the abutting portion against the first surface of the wall portion, and the projection of the abutting portion in the thickness direction of the wall portion does not overlap with the first protrusion of the pressure relief component, the abutting portion is a structure supported between the body portion and the wall portion, so that the body portion and the wall portion of the insulating member are structures spaced apart in the thickness direction of the wall portion, thereby enabling an interval space for avoiding the first protrusion of the pressure relief component to be formed between the first surface of the body portion and the wall portion of the insulating member, so as to form an avoidance portion for avoiding the first protrusion. The structure is simple and convenient for assembly.

[0020] In some embodiments, the insulating member includes a plurality of the abutting portions, and the plurality of the abutting portions are all connected to one side of the body portion facing the wall portion, and the plurality of the abutting portions are spaced apart.

[0021] In the above technical solution, by connecting a plurality of abutting portions to one side of the body portion facing the wall portion, and arranging the plurality of abutting portions at intervals, the structural stability of the insulating member assembled between the electrode assembly and the wall portion can be further improved, and the effect of the plurality of abutting portions supporting the body portion can be improved, so as to improve the overall structural strength of the insulating member, thereby reducing the phenomena such as deformation or collapse of the body portion during use, and alleviating the interference between the deformed body portion and the first protrusion of the pressure relief component, which is beneficial to further improving the effect of the insulating member avoiding the first protrusion of the pressure relief component.

[0022] 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 0.1 mm ≤ D2 ≤ 1.5 mm.

[0023] In the above technical solution, by setting the minimum distance between the body portion and the first protrusion in the thickness direction 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 of the insulating member on the first protrusion, so as to reduce the phenomena of the body portion of the insulating member 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 body portion and the first protrusion in the thickness direction of the wall portion to be less than or equal to 1.5 mm, the phenomenon of excessive space waste caused by the too large distance between the body portion and the first protrusion is alleviated, which is beneficial to improving the internal space utilization rate of the battery cell.

[0024] 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 seals the pressure relief hole; wherein, the first surface is provided with an assembly groove, the pressure relief hole penetrates through the bottom surface of the assembly groove, along the thickness direction of the wall portion, a part of the pressure relief component is accommodated in the assembly groove, and the second surface abuts against the bottom surface of the assembly groove.

[0025] In the above technical solution, by providing an assembly groove for assembling a pressure relief component on the first surface of the wall portion, the pressure relief hole is provided 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. On the one hand, the battery cell with this structure can improve the effect of the pressure relief component blocking the pressure relief hole, which is beneficial to reducing the risk of liquid leakage during the use of the battery cell. On the other hand, the assembly groove can play a certain role in limiting and positioning the pressure relief component, which is beneficial to improving the stability of the pressure relief component assembled on the wall portion and reducing the difficulty of connecting the pressure relief component to the wall portion.

[0026] In some embodiments, the first surface and the third surface are coplanar.

[0027] In the above technical solution, by setting the first surface of the wall portion and the third surface of the pressure relief component convex with the first protrusion to be coplanar, so that the area of the pressure relief component without the first protrusion is integrally accommodated in the assembly groove. On the one hand, it can further improve the stability of the pressure relief component assembled on the wall portion to improve 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 relieve the interference phenomenon between the area of the pressure relief component without the first protrusion and the insulating member or other components.

[0028] In some embodiments, 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. The first side wall and the first bottom wall jointly define the first groove, and the pressure relief groove is provided on the first bottom wall.

[0029] In the above technical solution, the first protrusion includes a first side wall and a first bottom wall. The first side wall surrounds the first bottom wall, so that the first side wall and the first bottom wall of the first protrusion jointly enclose and define the first groove. Among them, by providing the pressure relief groove on the first bottom wall of the first protrusion, the pressure relief groove is provided on the bottom wall of the first groove. The pressure relief component with this structure is convenient for processing the pressure relief groove on the first protrusion on the one hand, which is beneficial to reducing the processing difficulty of the pressure relief groove. On the other hand, the first side wall can also absorb and buffer part of the stress transmitted from the wall portion to the pressure relief component to reduce the stress influence on the area of the first protrusion provided with the pressure relief groove, which is beneficial to improving the use reliability and stability of the pressure relief component.

[0030] In some embodiments, the first bottom wall includes a main body portion and a arched portion. The main body portion connects the arched portion and the first side wall, and the main body portion surrounds the outside of the arched portion. Wherein, along the thickness direction of the wall portion, the arched portion arches from the main body portion in a direction away from the electrode assembly, so as to form a fourth groove at a position on the side of the first bottom wall facing the electrode assembly and corresponding to the arched portion, and the pressure relief groove is arranged on the main body portion.

[0031] In the above technical solution, by setting a part of the first bottom wall of the first protrusion to be arched in a direction away from the electrode assembly, the first bottom wall is formed with an arched portion and a main body portion that surrounds the outside of the arched portion and connects the arched portion and the first side wall. Wherein, by arranging the pressure relief groove on the main body portion, on the one hand, it can reduce the difficulty of forming the pressure relief groove on the first bottom wall, and is beneficial to improving the material flow form of the first bottom wall during the process of forming the pressure relief groove, so as to improve the processing quality of the pressure relief component. On the other hand, it can further improve the structural strength of the first bottom wall, which is beneficial to alleviating phenomena such as deformation of the pressure relief component during use, so as to improve the use reliability and stability of the pressure relief component.

[0032] In some embodiments, the pressure relief groove is arranged to surround the arched portion.

[0033] In the above technical solution, by arranging the pressure relief groove to be a ring-shaped structure surrounding the arched portion, when the pressure relief component cracks integrally along the pressure relief groove during the pressure relief of the battery cell, the area of the first bottom wall forming the arched portion can be integrally detached, which is beneficial to expanding the pressure relief area of the battery cell, so as to further improve the pressure relief rate of the battery cell, reduce the risk of explosion or bursting of the battery cell caused by untimely pressure relief, and further effectively improve the use reliability of the battery cell.

[0034] In some embodiments, along 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.

[0035] In the above technical solution, by arranging the pressure relief groove on the side of the main body portion of the first bottom wall away from the electrode assembly, the pressure relief groove is formed on the bottom surface of the first groove, so as to reduce the difficulty of forming the pressure relief groove on the main body portion of the first bottom wall, which is beneficial to forming the pressure relief groove while forming the first groove and the arched portion, and further can improve the processing efficiency of the pressure relief component.

[0036] In some embodiments, the pressure relief groove is formed by stamping on the main body portion.

[0037] In the above technical solution, by setting the pressure relief groove as a structure formed by stamping on the main body part of the first bottom wall, on the one hand, the manufacturing difficulty of the pressure relief groove can be reduced, which is beneficial to improving the processing efficiency of the pressure relief groove. On the other hand, in the structure where the pressure relief component is formed with a first groove and a first protrusion, and the first bottom wall of the first protrusion is formed with an arched part, it is convenient for the material flow formation during the stamping process of the pressure relief groove, which is beneficial to improving the processing consistency of the pressure relief groove, so as to improve the production quality of the pressure relief component.

[0038] In some embodiments, the pressure relief component is separately provided from the wall part, and the pressure relief component is welded to the wall part.

[0039] In the above technical solution, by welding the pressure relief component to the wall part, on the one hand, the difficulty of setting the pressure relief component on the outer shell can be reduced, so as to reduce 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 part, so as to improve the assembly stability between the pressure relief component and the wall part.

[0040] In some embodiments, the pressure relief component and the wall part are integrally formed.

[0041] In the above technical solution, by setting the pressure relief component and the wall part as an integrally formed structure, that is, the pressure relief component and the wall part are an integral structure. The battery cell adopting this structure is beneficial to improving the structural strength of the pressure relief component connected to the wall part, so as to reduce the risk of the pressure relief component detaching from the wall part during use, thereby improving the use stability of the battery cell.

[0042] In some embodiments, the material of the outer shell is the same as the material of the pressure relief component.

[0043] 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 structure, so as to realize the structure of welding the pressure relief component and the wall part with the same material, thereby improving the welding quality between the pressure relief component and the wall part, further improving the assembly quality between the pressure relief component and the wall part, and further reducing the welding difficulty between the pressure relief component and the wall part.

[0044] In some embodiments, the material of the outer shell and the material of the pressure relief component are both steel.

[0045] In the above technical solution, by setting the materials of the outer shell and the pressure relief component to steel, on the one hand, the structural strength of the outer shell can be improved to relieve the phenomenon of expansion and deformation of the outer shell of the battery cell during use, which is beneficial to reducing the stress on the pressure relief component caused by the deformation of the outer shell. On the other hand, the overall structural strength of the pressure relief component can be improved to relieve phenomena such as deformation of the pressure relief component during use, thereby reducing phenomena such as fatigue damage of the pressure relief component, and further being beneficial to reducing the risk of premature valve opening and pressure relief of the battery cell, so as to improve the service life and reliability of the battery cell.

[0046] In some embodiments, the outer shell includes a housing and an end cap; an accommodating cavity with an opening is formed inside the housing, and the electrode assembly is accommodated in the accommodating cavity; the end cap closes the opening; wherein, the end cap is the wall portion.

[0047] In the above technical solution, by setting the wall portion of the outer shell as the end cap for closing the opening of the outer shell, the battery cell with this structure is convenient for assembling the pressure relief component on the end cap, thereby being beneficial to reducing the manufacturing difficulty of the battery cell and improving the production efficiency of the battery cell.

[0048] In some embodiments, the outer shell includes a housing and an end cap; the housing 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 of the wall portion, one end of the second side wall is connected to the second bottom wall, and the other end encloses to form an opening, the second bottom wall and the second side wall jointly define the accommodating cavity, and the electrode assembly is accommodated in the accommodating cavity; the end cap closes the opening; wherein, the second bottom wall is the wall portion.

[0049] In the above technical solution, by setting the wall portion of the outer shell as the second bottom wall of the housing that is disposed opposite to the end cap in the thickness direction of the wall portion, the battery cell with this structure can make the area of the outer shell provided with the pressure relief component away from the end cap, thereby effectively relieving the phenomenon that the stress generated by the connection between the end cap and the housing acts on the pressure relief component, so as to reduce the influence on the pressure relief component, and further being beneficial to reducing the risk of cracking or structural strength decline of the pressure relief component under the pulling action of the stress, so as to improve the service life and reliability of the battery cell.

[0050] In a second aspect, an embodiment of the present application further provides a battery, including the above battery cell.

[0051] In a third aspect, an embodiment of the present application further provides an electrical device, including the above battery cell, and the battery cell is used to provide electrical energy. Description of the Drawings

[0052] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0053] Figure 1 Structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0054] Figure 2 Exploded view of the structure of a battery provided by some embodiments of the present application;

[0055] Figure 3 Structural schematic diagram of a battery cell provided by some embodiments of the present application;

[0056] Figure 4 Exploded view of the structure of a battery cell provided by some embodiments of the present application;

[0057] Figure 5 Partial cross-sectional view of a battery cell provided by some embodiments of the present application;

[0058] Figure 6 Structural schematic diagram of an insulating member of a battery cell provided by some embodiments of the present application;

[0059] Figure 7 Cross-sectional view of a pressure relief component of a battery cell provided by some embodiments of the present application;

[0060] Figure 8 Exploded view of the structure of a battery cell provided by some other embodiments of the present application;

[0061] Figure 9 Cross-sectional view of a battery cell provided by some other embodiments of the present application;

[0062] Figure 10 For Figure 9 Partial enlarged view of location A of the battery cell shown;

[0063] Figure 11 Exploded view of the structure of an insulating member of a battery cell provided by some other embodiments of the present application.

[0064] Icons: 1000 - Vehicle; 100 - Battery; 10 - Box; 11 - First box body; 12 - Second box body; 20 - Battery cell; 21 - Outer shell; 211 - Wall portion; 2111 - Pressure relief hole; 2112 - First surface; 2112a - Assembly groove; 212 - Housing; 2121 - Opening; 213 - End cap; 22 - Electrode assembly; 221 - Tab; 23 - Insulating part; 231 - Avoidance part; 2311 - Second groove; 2312 - Third groove; 232 - Fourth surface; 233 - Second protrusion; 2331 - Through hole; 234 - Body part; 2341 - Positioning hole; 235 - Contact 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 - Main body part; 2452b - Arch part; 2452c - Fourth groove; 25 - Electrode terminal; 26 - Current collecting member; 200 - Controller; 300 - Motor; X - Thickness direction of the wall portion. Detailed implementation manners

[0065] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0066] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non - exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary - secondary relationship.

[0067] Referring to the "embodiment" in the present application means that the specific features, structures, or characteristics described in combination with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0068] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "linkage", and "attachment" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0069] The term "and / or" in the present application is merely an association relationship describing associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0070] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, and other dimensions of various components shown in the drawings in the embodiments of the present application, as well as the overall thickness, length, width, and other dimensions of the integrated device, are only for illustrative purposes and should not constitute any limitation to the present application.

[0071] The term "a plurality of" appearing in the present application refers to two or more (including two).

[0072] In the embodiments of the present application, the battery cell may be a secondary battery, and a secondary battery refers to a battery cell that can be activated by charging after discharging to continue use.

[0073] The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application do not limit this.

[0074] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0075] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet 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.

[0076] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0077] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0078] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates can include but are not limited to lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and at least one of a composite material of lithium manganese iron phosphate and carbon. Examples of lithium transition metal oxides can 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, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be abbreviated as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be abbreviated as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be abbreviated as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be abbreviated as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be abbreviated 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, etc.

[0079] In some embodiments, the positive electrode can use a foam metal. The foam metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. When the foam metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foam metal, and of course, the positive electrode active material can also be provided. As an example, a lithium source material, potassium metal or sodium metal can also be filled or / and deposited in the foam metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0080] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0081] As an example, the negative electrode current collector can use a metal foil, a foam metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. can be used. The foam metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0082] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0083] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0084] As an example, the negative electrode active material can use the negative electrode active materials for battery monomers well-known in the art. As an example, the negative electrode active material can 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. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0085] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0086] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0087] In some embodiments, the separator is a separator membrane. The types of separator membranes can be various, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0088] As an example, the material of the separator membrane can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator membrane can be a single-layer film or a multi-layer composite film. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a single component located between the positive and negative electrodes or attached to the surfaces of the positive and negative electrodes.

[0089] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0090] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0091] In some embodiments, the electrolyte salt can 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 bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluorooxalate phosphate.

[0092] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene 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 can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0093] Among them, the gel-like electrolyte includes a polymer as the backbone network of the electrolyte, combined with an ionic liquid-lithium salt.

[0094] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0095] As an example, the polymer solid electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0096] As an example, the inorganic solid electrolyte can include oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0097] As an example, the composite solid electrolyte is formed by adding inorganic solid electrolyte fillers to the polymer solid electrolyte.

[0098] In some embodiments, the electrode assembly has a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0099] In some embodiments, the electrode assembly has a laminated structure.

[0100] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be respectively provided, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0101] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple folded segments arranged in a stacked manner, and a positive electrode sheet is clamped between adjacent folded segments.

[0102] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple folded segments arranged in a stacked manner.

[0103] As an example, multiple separators can be provided and are respectively arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0104] As an example, the separators can be continuously provided and are arranged between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0105] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, etc.

[0106] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0107] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0108] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes, but is not limited to, a square shell battery cell, a blade-shaped battery cell, and a multi-prismatic battery, such as a hexagonal prism battery.

[0109] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0110] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0111] In some embodiments, the battery can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0112] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the crossbeam and longitudinal beam of the vehicle.

[0113] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0114] The battery has outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and small self-discharge coefficient, and is an important part of the development of new energy today. The development of battery technology needs to consider various design factors at the same time, such as performance parameters such as energy density, cycle life, discharge capacity, and charge and discharge rate.

[0115] In battery technology, for a general battery cell, in order to ensure the use safety of the battery cell, a pressure relief component is usually provided on the battery cell to release the internal pressure of the battery cell through the pressure relief component, thereby effectively improving the use safety of the battery cell. In the related art, the pressure relief component is usually formed on the outer shell by an integral molding process, that is, integrated on the outer shell of the battery cell or connected to the outer shell by means of welding or the like, so that when the internal pressure or temperature of the battery cell reaches a threshold value, the pressure relief component can be actuated and opened to release the internal pressure of the battery cell. Among them, a pressure relief groove is usually stamped on the pressure relief component to form a weak area on the pressure relief component, so that the pressure relief component can crack at the weak area and release the internal pressure of the battery cell when the battery cell is pressure relieved. However, in order to improve the material flow pattern of the pressure relief groove of the pressure relief component during stamping in the related art, the pressure relief component is usually stamped into a structure with protrusions formed on both sides, especially in the pressure relief component made of steel. However, the pressure relief component with such a structure is very likely to interfere with other components inside the battery cell during assembly, resulting in poor assembly quality of the battery cell, which is not conducive to improving the production quality of the battery cell.

[0116] Based on the above considerations, in order to solve the problem of poor assembly quality of the battery cell, an embodiment of the present application provides a battery cell, which includes an outer shell, an electrode assembly, an insulating member, and a pressure relief component. The outer shell has a wall portion, and the pressure relief component is provided on the wall portion and is configured to release the internal pressure of the battery cell. The electrode assembly is accommodated in the outer shell. The insulating member is provided on one side of the wall portion facing the electrode assembly and 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, and at least a part of the pressure relief component protrudes from the first surface. An avoidance portion is formed on one side of the insulating member facing the wall portion, and the avoidance portion accommodates the part of the pressure relief component protruding from the first surface.

[0117] In the battery cell with such a structure, by providing an avoidance portion on one side of the insulating member facing the wall portion for accommodating the part of the pressure relief component protruding from the first surface, the insulating member can avoid the part of the pressure relief component protruding from the first surface. On the one hand, it can relieve the interference between the pressure relief component and the insulating member or other components, so as to improve the assembly quality of the battery cell. On the other hand, by accommodating the part of the pressure relief component protruding from the first surface in the avoidance portion of the insulating member, the insulating member can also play a certain protective role on the pressure relief component to reduce the phenomenon of wear or damage of the pressure relief component during assembly, which is conducive to improving the production quality of the battery cell.

[0118] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in power-consuming devices such as vehicles, ships, or aircraft. A power supply system of the power-consuming device can be composed of the battery cells, batteries, etc. disclosed in the present application. In this way, it is beneficial to alleviate the problem that the pressure relief component of the battery cell interferes with other components during assembly, so as to improve the assembly quality of the battery cell.

[0119] The embodiments of the present application provide a power-consuming device using a battery as a power source. The power-consuming device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0120] For the convenience of description in the following embodiments, a vehicle is taken as an example of a power-consuming device in an embodiment of the present application for illustration.

[0121] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can be used as an operating power source or a power consumption source of the vehicle 1000, etc. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0122] In some embodiments of the present application, the battery 100 can not only be used as an operating power source or a power consumption source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0123] Please refer to Figure 2 and Figure 3 , Figure 2 which is an exploded view of the structure of the battery 100 provided in some embodiments of the present application, Figure 3 which is a schematic structural diagram of a battery cell 20 provided in some embodiments of the present application. The battery 100 includes a box body 10 and the battery cell 20. The battery cell 20 is used to be accommodated in the box body 10.

[0124] Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may 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 jointly define an assembly space; the first box body 11 and the second box body 12 may also both 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.

[0125] Of course, the box body 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, etc. Exemplarily, in Figure 2 the box body 10 is in the shape of a cuboid.

[0126] In the battery 100, the number of battery cells 20 disposed in the box body 10 can be one or multiple. When there are multiple battery cells 20 disposed in the box body 10, the multiple battery cells 20 can be connected in series, in parallel or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel or in a mixed connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery 100 can also be that multiple battery cells 20 are first connected in series, in parallel or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, in parallel or in a mixed connection to form a whole, and the whole is accommodated in the box body 10.

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

[0128] Among them, 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 thereto. The battery cell 20 can be in the shape of a cuboid, a cylinder, a prism or other shapes, etc. Exemplarily, in Figure 3 the battery cell 20 is in a cuboid structure.

[0129] According to some embodiments of the present application, referring to Figure 3 , and further referring to Figure 4 , Figure 5 and Figure 6 , Figure 4Explosion diagram of the structure of the battery cell 20 provided by some embodiments of the present application. Figure 5 Partial cross-sectional view of the battery cell 20 provided by some embodiments of the present application. Figure 6 Schematic structural diagram of the insulating member 23 of the battery cell 20 provided by some embodiments of the present application. The present 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, and the pressure relief member 24 is configured to release 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, 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 part of the pressure relief member 24 protrudes from the first surface 2112, and a relief portion 231 is formed on the side of the insulating member 23 facing the wall portion 211, and the relief portion 231 accommodates the part of the pressure relief member 24 protruding from the first surface 2112.

[0130] Among them, the housing 21 can also be used to accommodate an electrolyte, for example, an electrolytic solution. The housing 21 can be in various structural forms, such as a cylinder, a cuboid, or a prism structure, etc. Similarly, the material of the housing 21 can also be various, such as copper, iron, aluminum, steel, or aluminum alloy, etc.

[0131] In some embodiments, the housing 21 may include a housing body 212 and an end cap 213. An accommodation cavity is formed inside the housing body 212 for accommodating the electrode assembly 22, and the accommodation cavity has an opening 2121. That is to say, the housing body 212 is a hollow structure with one end open 2121, and the end cap 213 is covered on the opening 2121 of the housing body 212 and forms a sealed connection to form a closed space for accommodating the electrode assembly 22 and the electrolyte.

[0132] It should be noted that the wall portion 211 provided with the pressure relief member 24 can be the end cap 213 of the housing 21, or a wall of the housing body 212 of the housing 21. Exemplarily, in Figure 3 and Figure 4 , the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited thereto. In other embodiments, the wall portion 211 can also be the second bottom wall of the housing body 212 opposite to the end cap 213, and the wall portion 211 can also be the second side wall of the housing body 212 adjacent to and connected to the end cap 213.

[0133] When assembling the battery cell 20, the electrode assembly 22 can be first placed into the housing body 212, and the electrolytic solution can be filled into the housing body 212, and then the end cap 213 can be covered on the opening 2121 of the housing body 212 to complete the assembly of the battery cell 20.

[0134] The housing 212 can be of various shapes, such as a cylinder, a cuboid, or a prism structure, etc. 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 cylinder structure, a cylinder structure housing 212 can be selected; if the electrode assembly 22 is a cuboid structure, a cuboid structure housing 212 can be selected. Of course, the structure of the end cap 213 can also be various, such as the end cap 213 being a plate-like structure or a hollow structure with one end open, etc.

[0135] Of course, it can be understood that the outer shell 21 is not limited to the above structure only. The outer shell 21 can also be other structures. For example, the outer shell 21 can 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 correspondingly covers one opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is to say, openings 2121 are formed on both opposite sides of the housing 212, and the two end caps 213 respectively cover both sides of the housing 212 to close the corresponding openings 2121.

[0136] It should be noted that the electrode assembly 22 is a component in the battery cell 20 where an 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 a positive electrode sheet, a separator, and a negative electrode sheet, or a stacked structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet in layers.

[0137] Exemplarily, 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.

[0138] Optionally, the electrode assembly 22 accommodated in the outer shell 21 can be one or multiple. Exemplarily, in Figure 4 , two electrode assemblies 22 are provided in the outer shell 21 of the battery cell 20, and the two electrode assemblies 22 are stacked along their thickness direction. That is to say, 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 only. In other embodiments, the number of electrode assemblies 22 accommodated in the outer shell 21 can also be one, three, four, five, six, seven, eight, etc.

[0139] In some embodiments, refer to Figure 3 and Figure 4As shown, the battery cell 20 may further include electrode terminals 25. The electrode terminals 25 are insulatingly mounted on the housing 21. One end of the electrode assembly 22 forms a tab 221. The electrode terminal 25 is electrically connected to the tab 221 of the electrode assembly 22 to output or input the electrical energy of the battery cell 20.

[0140] It should be noted that the electrode terminals 25 are insulatingly mounted on the housing 21, that is to say, no electrical connection is formed between the electrode terminals 25 and the housing 21.

[0141] Among them, in Figure 3 and Figure 4 , the battery cell 20 includes two electrode terminals 25. The two electrode terminals 25 are spaced apart on the end cap 213. Correspondingly, each electrode assembly 22 has two tabs 221. The polarities of the two tabs 221 are opposite. The two tabs 221 are spaced apart and are both located at one end of the electrode assembly 22 facing the end cap 213. The two electrode terminals 25 are respectively electrically connected to the two tabs 221 of the electrode assembly 22 to realize the input or output of the positive and negative electrodes of the battery cell 20. It should be noted that the tab 221 of the electrode assembly 22 is a component formed by laminating and connecting regions on the positive electrode plate where the positive electrode active material layer is not coated or regions on the negative electrode plate where the negative electrode active material layer is not coated. If the tab 221 is used to output the positive electrode of the electrode assembly 22, the tab 221 is a component formed by laminating and connecting regions on the positive electrode plate where the positive electrode active material layer is not coated; if the tab 221 is used to output the negative electrode of the electrode assembly 22, the tab 221 is a component formed by laminating and connecting regions on the negative electrode plate where the negative electrode active material layer is not coated.

[0142] Exemplarily, the material of the electrode terminals 25 can also be various. For example, the material of the electrode terminals 25 can be copper, iron, aluminum, steel or aluminum alloy, etc.

[0143] Optionally, the structure of the electrode terminals 25 mounted on the housing 21 can be various. Exemplarily, in Figure 3 and Figure 4 , both of the two 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 be other structures. For example, both of the two electrode terminals 25 can also be mounted on the housing 212 of the housing 21. Similarly, for the two electrode terminals 25, 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.

[0144] In some embodiments, referring to Figure 4As shown, the battery cell 20 may further include two current collecting members 26. The two current collecting members 26 are both disposed within the housing 21 and are spaced apart. Each current collecting member 26 is used to connect one electrode terminal 25 and the tabs 221 with the same polarity among the plurality of electrode assemblies 22, so as to achieve electrical connection between the electrode terminal 25 and the electrode assembly 22, which is beneficial to reducing the assembly difficulty between the tab 221 and the electrode terminal 25.

[0145] Exemplarily, the material of the current collecting member 26 can also be various. For example, the material of the current collecting member 26 can be copper, iron, aluminum, steel, or aluminum alloy, etc.

[0146] In the embodiment of the present application, the insulating member 23 functions 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 to say, 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.

[0147] Exemplarily, the material of the insulating member 23 can be various. For example, rubber, silica gel, or plastic, etc.

[0148] In the embodiment of the present application, the pressure relief component 24 functions to relieve pressure in the battery cell 20, and is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0149] Among them, the wall portion 211 is provided with the pressure relief component 24. The pressure relief component 24 and the wall portion 211 can be an integrally formed structure or a separately disposed structure. Exemplarily, in Figure 4 and Figure 5 the pressure relief component 24 and the wall portion 211 are a separately disposed structure. A pressure relief hole 2111 is provided on the wall portion 211. The pressure relief component 24 is connected to the wall portion 211 and the pressure relief component 24 plugs the pressure relief hole 2111. That is to say, the pressure relief component 24 is assembled on the wall portion 211 and has a structure that plugs and covers the pressure relief hole 2111. Among them, the pressure relief hole 2111 penetrates the wall portion 211, and the pressure relief hole 2111 communicates the inside and the outside of the housing 21, so that when the pressure relief component 24 is actuated and cracked, the inside and the outside of the housing 21 can be interconnected to release the internal pressure of the battery cell 20. Similarly, in the embodiment where the pressure relief component 24 and the wall portion 211 are separately disposed and connected, the structure of the pressure relief component 24 connected to the wall portion 211 can also be various. For example, welded connection, snap connection, or adhesive connection, etc.

[0150] Refer to Figure 7 , Figure 7A cross-sectional view of the pressure relief component 24 of the battery cell 20 provided by some embodiments of the present application. A pressure relief groove 241 is provided on the pressure relief component 24. The pressure relief component 24 can crack along at least part of the area where the pressure relief groove 241 is located when the battery cell 20 relieves pressure, so as to release the internal pressure of the battery cell 20.

[0151] Exemplarily, the pressure relief groove 241 on the pressure relief component 24 is formed by a stamping process.

[0152] 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 part of the pressure relief component 24 protrudes from the first surface 2112. That is to say, at least part of the pressure relief component 24 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 component 24 can be entirely located on the side of the wall portion 211 facing the electrode assembly 22, or only part of it protrudes from the side of the wall portion 211 facing the electrode assembly 22.

[0153] An avoidance portion 231 is formed on the side of the insulating member 23 facing the wall portion 211. The avoidance portion 231 accommodates the part of the pressure relief component 24 that protrudes from the first surface 2112. That is to say, an avoidance portion 231 that can avoid the part of the pressure relief component 24 that protrudes from the first surface 2112 is formed on the side of the insulating member 23 facing the wall portion 211 in the thickness direction X of the wall portion, so that the part of the pressure relief component 24 that protrudes from the first surface 2112 can be accommodated in the avoidance portion 231 of the insulating member 23. That is to say, the part of the pressure relief component 24 that protrudes from the first surface 2112 does not contact the insulating member 23.

[0154] Optionally, the avoidance portion 231 can be an avoidance groove provided on the side of the insulating member 23 facing the wall portion 211, or an avoidance space formed on the side of the insulating member 23 facing the wall portion 211, etc.

[0155] In this embodiment, by providing an avoidance portion 231 on the side of the insulating member 23 facing the wall portion 211 for accommodating the part of the pressure relief component 24 that protrudes from the first surface 2112, the insulating member 23 can avoid the part of the pressure relief component 24 that protrudes from the first surface 2112. On the one hand, it can relieve the interference between the pressure relief component 24 and the insulating member 23 or other components, so as to improve the assembly quality of the battery cell 20. On the other hand, by accommodating the part of the pressure relief component 24 that protrudes from the first surface 2112 in the avoidance portion 231 of the insulating member 23, the insulating member 23 can also play a certain protective role for the pressure relief component 24, so as to reduce the phenomenon of wear or damage of the pressure relief component 24 during the assembly process, which is beneficial to improving the production quality of the battery cell 20.

[0156] According to some embodiments of the present application, refer to Figure 5 andFigure 6 As shown, the pressure relief component 24 is separately provided and connected to the wall portion 211. Along the thickness direction X of the wall portion, the projection of the pressure relief component 24 is entirely located within the avoidance portion 231.

[0157] In this embodiment, by setting the entirety of the projection of the pressure relief component 24 in the thickness direction X of the wall portion to be located within the avoidance portion 231, the avoidance portion 231 can avoid the entire pressure relief component 24, which is beneficial to further improving the effect of the insulating member 23 avoiding the portion of the pressure relief component 24 protruding from the first surface 2112, thereby further alleviating the interference phenomenon between the pressure relief component 24 and the insulating member 23 or other components, so as to improve the assembly quality of the battery cell 20.

[0158] According to some embodiments of the present application, referring to Figure 5 、 Figure 6 and Figure 7 As shown, along the thickness direction X of the wall portion, the pressure relief component 24 has opposite second surface 242 and third surface 243. The third surface 243 faces the electrode assembly 22. The second surface 242 is provided with a first groove 244. At a position corresponding to the first groove 244 of the pressure relief component 24, a first protrusion 245 protruding from the third surface 243 is formed. The first protrusion 245 is provided with a pressure relief groove 241. The pressure relief component 24 is configured to be able to crack along at least part of the pressure relief groove 241 when the battery cell 20 relieves pressure, so as to release the internal pressure of the battery cell 20. At least part of the first protrusion 245 protrudes from the first surface 2112.

[0159] Among them, the pressure relief component 24 has opposite second surface 242 and third surface 243. The third surface 243 faces the electrode assembly 22. That is to say, 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.

[0160] The second surface 242 is provided with a first groove 244. At a position corresponding to the first groove 244 of the pressure relief component 24, a first protrusion 245 protruding from the third surface 243 is formed. That is to say, the pressure relief component 24 has a structure in which a first groove 244 is formed on the second surface 242 and a first protrusion 245 protrudes on the corresponding 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.

[0161] The first protrusion 245 is provided with a pressure relief groove 241, and the pressure relief component 24 is configured to be able to split along at least part of the pressure relief groove 241 when the battery cell 20 releases pressure. That is, the weak structure formed by the pressure relief groove 241 provided on the pressure relief component 24 is located on the first protrusion 245. Optionally, the pressure relief groove 241 can be provided on the bottom wall of the first groove 244, or on the bottom wall of the first groove 244.

[0162] At least part of the first protrusion 245 protrudes from the first surface 2112, that is, the first protrusion 245 formed on the pressure relief component 24 is a structure protruding from the wall portion 211 facing the electrode assembly 22, that is, the pressure relief component 24 is formed with the first protrusion 245 during the process of processing 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 the first protrusion 245 protrudes from the first surface 2112 of the wall portion 211 facing the electrode assembly 22. Among them, the first groove 244, the first protrusion 245 and the pressure relief groove 241 are all structures formed by a stamping process.

[0163] In the present embodiment, the pressure relief component 24 is 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 of the pressure relief component 24 for pressure relief is arranged on the first protrusion 245, and the pressure relief component 24 is a structure in which the first protrusion 245 protrudes from the first surface 2112 and is accommodated in the avoidance portion 231 of the insulating member 23. The battery cell 20 adopting this structure is convenient for processing and forming the pressure relief groove 241 on the pressure relief component 24, which is conducive to improving the material flow form of the pressure relief component 24 in the process of forming the pressure relief groove 241, thereby improving the processing quality of the pressure relief component 24, and is conducive to improving the pressure relief component 24 for setting the 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 part of the first protrusion 245 of the pressure relief component 24 to be accommodated in the avoidance portion 231, so that the insulating member 23 can avoid the first protrusion 245, it is beneficial to alleviate the interference between the first protrusion 245 and the insulating member 23 or other components, and the insulating member 23 can also play a certain protective role on the first protrusion 245 provided with the pressure relief groove 241, so as to reduce the wear or damage of the first protrusion 245 during the assembly process, which is beneficial to reduce the phenomenon of premature valve opening and pressure relief of the pressure relief component 24.

[0164] According to some embodiments of this application, see Figure 5 , Figure 6 and Figure 7As shown, 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. The avoiding portion 231 includes a second groove 2311. The second groove 2311 is recessed from the fourth surface 232 in the direction approaching the electrode assembly 22, so as to form a second protrusion 233 at a position corresponding to the second groove 2311 on the side of the insulating member 23 facing the electrode assembly 22. The second protrusion 233 abuts against the electrode assembly 22, and the second groove 2311 accommodates at least a part of the first protrusion 245.

[0165] Among them, 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 to say, 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.

[0166] The second groove 2311 is recessed from the fourth surface 232 in the direction approaching the electrode assembly 22, so as to form a second protrusion 233 at a position corresponding to the second groove 2311 on the side of the insulating member 23 facing the electrode assembly 22. That is to say, the avoiding portion 231 at least includes the second groove 2311 provided on the fourth surface 232 of the insulating member 23, and a second protrusion 233 is formed at a position corresponding to the second groove 2311 on the side of the insulating member 23 facing away from the wall portion 211, so that the insulating member 23 has a structure with a second groove 2311 formed on one side and a second protrusion 233 formed on the other side.

[0167] The second protrusion 233 abuts against the electrode assembly 22. That is to say, the second protrusion 233 and the electrode assembly 22 abut against each other in the thickness direction X of the wall portion. 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 portion.

[0168] The second groove 2311 accommodates at least a part of the first protrusion 245. That is to say, the avoiding portion 231 includes the second groove 2311 provided on the fourth surface 232 of the insulating member 23. If the avoiding portion 231 only includes the second groove 2311, the first protrusion 245 is a structure whose projection in the thickness direction X of the wall portion is located within the second groove 2311. If the avoiding portion 231 further includes other grooves, it can be the second groove 2311 and other grooves of the avoiding portion 231 that jointly accommodate the first protrusion 245, for example. Exemplarily, in Figure 5 and Figure 6 the avoiding portion 231 includes a second groove 2311 and a third groove 2312 penetrating the side surface of the second groove 2311. The third groove 2312 and the second groove 2311 jointly cooperate to avoid the first protrusion 245.

[0169] 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 insulating member 23 on the side away from the fourth surface 232 and corresponding to the position of the second groove 2311, so that at least a portion of the first protrusion 245 can be avoided by setting a groove structure on the insulating member 23. 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, which is beneficial to improving the stability and reliability of the electrode assembly 22 and the insulating member 23 when assembled in the outer shell 21, so as to reduce the shaking or displacement of the insulating member 23 and the electrode assembly 22 during use.

[0170] In some embodiments, see Figure 5 and Figure 6 As shown, the second protrusion 233 is provided with a through hole 2331, and the through hole 2331 is communicated with the second groove 2311. In other words, the through hole 2331 is a structure that penetrates the bottom wall of the second groove 2311.

[0171] For example, in Figure 6 In the embodiment, a plurality of through holes 2331 are disposed on the second protrusion 233, and the plurality of through holes 2331 are arranged at intervals.

[0172] In this embodiment, by providing a through hole 2331 on the second protrusion 233 that is interconnected with the second groove 2311, the space on the side of the insulating member 23 facing the electrode assembly 22 can be interconnected with the second groove 2311 of the insulating member 23 for avoiding the first protrusion 245 through the through hole 2331. Therefore, when the battery cell 20 is depressurized through the pressure relief component 24, the gas in the outer shell 21 is facilitated to pass through the through hole 2331 into the second groove 2311 and then be discharged to the outside of the outer shell 21 through the pressure relief component 24, which is beneficial to improving the internal exhaust smoothness of the battery cell 20 when the pressure is relieved, and further can effectively improve the pressure relief rate of the battery cell 20, which is beneficial to reducing the risk of explosion or bursting of the battery cell 20 caused by untimely pressure relief, so as to improve the reliability of the battery cell 20.

[0173] According to some embodiments of this application, please continue to refer to Figure 5 and Figure 6As shown, the avoidance portion 231 may further include a third groove 2312. The third groove 2312 is recessed from the fourth surface 232 towards the electrode assembly 22, and the third groove 2312 penetrates through the groove side surface of the second groove 2311. Along the thickness direction X of the wall portion, the groove bottom surface of the third groove 2312 is closer to the wall portion 211 than the groove bottom surface of the second groove 2311. The second groove 2311 accommodates a part of the first protrusion 245, and the third groove 2312 accommodates the part of the first protrusion 245 located outside the second groove 2311.

[0174] Among them, the third groove 2312 is recessed from the fourth surface 232 towards the electrode assembly 22, and the third groove 2312 penetrates through the groove side surface of the second groove 2311. That is to say, the third groove 2312 is a groove structure provided on the fourth surface 232 of the insulating member 23, and the third groove 2312 communicates with the groove side surface of the second groove 2311, so that the third groove 2312 and the second groove 2311 communicate with each other, and the third groove 2312 is a structure for further expanding the capacity on the groove side surface of the second groove 2311.

[0175] Along the thickness direction X of the wall portion, the groove bottom surface of the third groove 2312 is closer to the wall portion 211 than the groove bottom surface of the second groove 2311. That is to say, the groove depth of the third groove 2312 in the thickness direction X of the wall portion is less than the groove depth of the second groove 2311 in the thickness direction X of the wall portion.

[0176] The second groove 2311 accommodates a part of the first protrusion 245, and the third groove 2312 accommodates the part of the first protrusion 245 located outside the second groove 2311. That is to say, the second groove 2311 and the third groove 2312 play a structure that cooperates to avoid the first protrusion 245 of the pressure relief component 24, that is, a part of the projection of the first protrusion 245 in the thickness direction X of the wall portion is located in the second groove 2311, and the other part is located in the third groove 2312.

[0177] 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 groove side surface of the second groove 2311, and the groove bottom surface of the third groove 2312 is closer to the wall portion 211 than the groove bottom surface of the second groove 2311 in the thickness direction X of the wall portion, so that the groove depth of the third groove 2312 is smaller than the groove depth of the second groove 2311, and the third groove 2312 is a structure for further expanding the capacity on the groove side surface of the second groove 2311, so that the third groove 2312 and the second groove 2311 can cooperate together to avoid the first protrusion 245. By adopting the insulating member 23 with this structure, only by locally expanding the second groove 2311 to form the third groove 2312 can the first protrusion 245 be avoided, without expanding the area of the insulating member 23 provided with the second groove 2311, thereby reducing the volume of the second protrusion 233 corresponding to the second groove 2311, which is beneficial to saving the space occupied by the insulating member 23, improving the internal space utilization rate of the battery cell 20, and reducing the processing difficulty and processing cost of the insulating member 23.

[0178] In some embodiments, referring to Figure 5 As shown, along the thickness direction X of the wall portion, the minimum distance between the groove bottom surface of the third groove 2312 and the first protrusion 245 is D1, satisfying 0.1 mm ≤ D1 ≤ 1.5 mm.

[0179] Exemplarily, the minimum distance D1 between the groove bottom surface of the third groove 2312 and the first protrusion 245 can be 0.1 mm, 0.12 mm, 0.13 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, etc.

[0180] In this embodiment, by setting the minimum distance between the groove bottom surface of the third groove 2312 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 that the insulating member 23 interferes with or wears the first protrusion 245, thereby further improving the assembly quality of the battery cell 20. In addition, by setting the minimum distance between the groove bottom surface of the third groove 2312 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 too large a distance between the groove bottom surface of the third groove 2312 and the first protrusion 245 is alleviated, which is beneficial to improving the internal space utilization rate of the battery cell 20.

[0181] According to some embodiments of the present application, referring toFigure 8 , Figure 9 , Figure 10 and Figure 11 , Figure 8 is an exploded view of the structure of the battery cell 20 provided by some other embodiments of the present application. Figure 9 is a cross-sectional view of the battery cell 20 provided by some other embodiments of the present application. Figure 10 is Figure 9 a partial enlarged view of the A position of the battery cell 20 shown in Figure 11 is an exploded view of the structure of the insulating member 23 of the battery cell 20 provided by some other embodiments of the present application. The insulating member 23 may include a main body portion 234 and an abutting portion 235. The main 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 abutting portion 235 is connected to one side of the main body portion 234 facing the wall portion 211, and the abutting portion 235 abuts against the first surface 2112. Along the thickness direction X of the wall portion, the projection of the abutting portion 235 does not overlap with the projection of the first protrusion 245, so as to form a spaced space between the main body portion 234 and the first surface 2112, and the spaced space is the avoidance portion 231.

[0182] Among them, the main body portion 234 is disposed between the wall portion 211 and the electrode assembly 22 along the thickness direction X of the wall portion, that is to say, the main body portion 234 of the insulating member 23 is the part that plays an insulating and isolating role between the wall portion 211 and the electrode assembly 22.

[0183] The abutting portion 235 is connected to one side of the main body portion 234 facing the wall portion 211, and the abutting portion 235 abuts against the first surface 2112, that is to say, the abutting portion 235 is a structure that supports between the main body portion 234 and the wall portion 211 in the thickness direction X of the wall portion.

[0184] Along the thickness direction X of the wall portion, the projection of the abutting portion 235 does not overlap with the projection of the first protrusion 245, so as to form a spaced space between the main body portion 234 and the first surface 2112, that is to say, the abutting 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 main body portion 234 of the insulating member 23 and the first surface 2112 of the wall portion 211 are spaced apart from each other and form a spaced space structure, and this spaced space is the avoidance portion 231 for the insulating member 23 to avoid the first protrusion 245.

[0185] Optionally, the abutting portion 235 connected to one side of the main body portion 234 facing the wall portion 211 may be one or more. Similarly, the structure of the abutting portion 235 connected to the main body portion 234 may also be various, such as bonding, snap connection or hot melt connection, etc.

[0186] In some embodiments, refer to Figure 11As shown, positioning holes 2341 may also be provided on the body portion 234. The positioning holes 2341 penetrate the body portion 234 along the thickness direction X of the wall portion. The positioning holes 2341 play a positioning role during the process of assembling the insulating part 23 into the housing 21, so as to reduce the difficulty of assembling the insulating part 23 into the housing 21 and improve the accuracy of assembling the insulating part 23 into the housing 21.

[0187] Exemplarily, two positioning holes 2341 are provided on the body portion 234, and the two positioning holes 2341 are spaced apart on the body portion 234. It should be noted that if the abutting portion 235 is connected to the area of the body portion 234 where the positioning holes 2341 are provided, a notch or a passage for avoiding the positioning holes 2341 is also provided at the position of the abutting portion 235 corresponding to the positioning holes 2341 in the thickness direction X of the wall portion.

[0188] In this embodiment, the insulating part 23 is provided with a body portion 234 and an abutting portion 235 connected to one side of the body portion 234 facing the wall portion 211. By abutting the abutting portion 235 against the first surface 2112 of the wall portion 211, and the projection of the abutting portion 235 in the thickness direction X of the wall portion does not overlap with the first protrusion 245 of the pressure relief component 24, the abutting portion 235 is a structure supported between the body portion 234 and the wall portion 211, so that the body portion 234 of the insulating part 23 and the wall portion 211 are structures spaced apart in the thickness direction X of the wall portion, so as to be able to form a spaced space for avoiding the first protrusion 245 of the pressure relief component 24 between the body portion 234 of the insulating part 23 and the first surface 2112 of the wall portion 211, so as to form an avoidance portion 231 for avoiding the first protrusion 245. The structure is simple and convenient for assembly.

[0189] In some embodiments, as shown in Figure 11 the insulating part 23 includes a plurality of abutting portions 235. The plurality of abutting portions 235 are all connected to one side of the body portion 234 facing the wall portion 211, and the plurality of abutting portions 235 are spaced apart.

[0190] Exemplarily, two abutting portions 235 are connected to one side of the body portion 234 facing the wall portion 211 in the thickness direction X of the wall portion. The two abutting portions 235 are arranged at intervals in a direction perpendicular to the thickness direction X of the wall portion, and the two abutting 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 thereto. In other embodiments, the insulating part 23 may also be provided with three, four, five, six or seven etc. abutting portions 235.

[0191] In this embodiment, by connecting a plurality of abutting portions 235 to the side of the body portion 234 facing the wall portion 211, and arranging the plurality of abutting 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 plurality of abutting portions 235 supporting the body portion 234 can be improved, so as to improve the overall structural strength of the insulating member 23, thereby reducing the phenomena such as deformation or collapse of the body portion 234 during use, and alleviating the interference phenomenon between the deformed body portion 234 and the first protrusion 245 of the pressure relief member 24, which is beneficial to further improving the effect of the insulating member 23 avoiding the first protrusion 245 of the pressure relief member 24.

[0192] In some embodiments, referring to Figure 10 As shown, along the thickness direction X of the wall portion, the minimum distance between the body portion 234 and the first protrusion 245 is D2, satisfying 0.1 mm ≤ D2 ≤ 1.5 mm.

[0193] Exemplarily, the minimum distance D2 between the body portion 234 and the first protrusion 245 can be 0.1 mm, 0.12 mm, 0.13 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, etc.

[0194] 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 that the body portion 234 of the insulating member 23 interferes with or wears 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 excessive space waste caused by the too large distance between the body portion 234 and the first protrusion 245 is alleviated, which is beneficial to improving the internal space utilization rate of the battery cell 20.

[0195] According to some embodiments of the present application, referring to Figure 5 and Figure 7As shown, 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 blocks the pressure relief hole 2111. An assembly groove 2112a is provided on the first surface 2112, and the pressure relief hole 2111 penetrates the bottom surface of the assembly groove 2112a. Along the thickness direction X of the wall portion, a part of the pressure relief component 24 is received in the assembly groove 2112a, and the second surface 242 abuts against the bottom surface of the assembly groove 2112a.

[0196] Among them, the pressure relief hole 2111 penetrates the bottom surface of the assembly groove 2112a. That is to say, the pressure relief hole 2111 of the wall portion 211 is a structure provided on the bottom surface of the assembly groove 2112a.

[0197] A part of the pressure relief component 24 is received in the assembly groove 2112a, and the second surface 242 abuts against the bottom surface of the assembly groove 2112a. That is to say, a part of the pressure relief component 24 is assembled into the assembly groove 2112a of the wall portion 211, and the second surface 242 of the pressure relief component 24 provided with the first groove 244 and the bottom surface of the assembly groove 2112a are in an abutting structure.

[0198] Exemplarily, the area of the pressure relief component 24 where the first protrusion 245 is not formed is received in the assembly groove 2112a. Of course, it may be that a part of the area of the pressure relief component 24 where the first protrusion 245 is not formed is received in the assembly groove 2112a, or the entire area of the pressure relief component 24 where the first protrusion 245 is not formed is received in the assembly groove 2112a.

[0199] In this embodiment, by providing the assembly groove 2112a for assembling a part of 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. On the one hand, the battery cell 20 with this structure can improve the effect of the pressure relief component 24 blocking the pressure relief hole 2111, which is beneficial to reducing the risk of liquid leakage during the use of the battery cell 20. On the other hand, the assembly groove 2112a can play a certain role in limiting and positioning 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 reducing the difficulty of connecting the pressure relief component 24 to the wall portion 211.

[0200] In some embodiments, refer to Figure 5As shown, 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 received within the assembly groove 2112a, and the third surface 243 of the pressure relief component 24 where the first protrusion 245 is convex and the first surface 2112 of the wall portion 211 where the assembly groove 2112a is provided are flush with each other. That is, 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 depth of the assembly groove 2112a in the thickness direction X of the wall portion.

[0201] 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 where the first protrusion 245 is convex to be coplanar, so that the area of the pressure relief component 24 where the first protrusion 245 is not formed is integrally received within the assembly groove 2112a. On the one hand, it can further improve the stability of the pressure relief component 24 assembled to the wall portion 211 to improve the assembly quality of the battery cell 20. On the other hand, it enables the assembly groove 2112a to also play a certain protective role for the pressure relief component 24, and can relieve the interference between the area of the pressure relief component 24 where the first protrusion 245 is not formed and the insulating member 23 or other components.

[0202] According to some embodiments of the present application, refer to Figure 5 and Figure 7 As shown, the first protrusion 245 includes a first side wall 2451 and a first bottom wall 2452. The first side wall 2451 surrounds the first bottom wall 2452, and the first side wall 2451 is connected to the first bottom wall 2452. The first side wall 2451 and the first bottom wall 2452 together define a first groove 244, and the pressure relief groove 241 is provided on the first bottom wall 2452.

[0203] Among them, the first side wall 2451 of the first protrusion 245 is also the groove side wall of the first groove 244, so that the first side wall 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 side wall 2451 and the first bottom wall 2452 of the first protrusion 245 are structures that jointly enclose and define the first groove 244.

[0204] The pressure relief groove 241 is provided on the first bottom wall 2452, that is, the pressure relief groove 241 is provided on the groove bottom wall of the first groove 244. Exemplarily, in Figure 7In this case, the pressure relief groove 241 is disposed on the surface of the first bottom wall 2452 on the side facing away from the electrode assembly 22. That is to say, 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 may also have other structures. For example, the pressure relief groove 241 may also be disposed on the surface of the first bottom wall 2452 on the side facing the electrode assembly 22.

[0205] In this embodiment, the first protrusion 245 includes a first side wall 2451 and a first bottom wall 2452. The first side wall 2451 surrounds the first bottom wall 2452, so that the first side wall 2451 and the first bottom wall 2452 of the first protrusion 245 jointly enclose and define the first groove 244. Among them, by disposing the pressure relief groove 241 on the first bottom wall 2452 of the first protrusion 245, the pressure relief groove 241 is a structure disposed on the bottom wall of the first groove 244. For the pressure relief component 24 with such a structure, on the one hand, it is convenient to process the pressure relief groove 241 on the first protrusion 245, which is beneficial to reducing the processing difficulty of the pressure relief groove 241. On the other hand, through the first side wall 2451, part of the stress transmitted from the wall portion 211 to the pressure relief component 24 can also be absorbed and buffered, so as to reduce the stress influence on the area of the first protrusion 245 where the pressure relief groove 241 is provided, which is beneficial to improving the use reliability and stability of the pressure relief component 24.

[0206] According to some embodiments of the present application, referring to Figure 7 As shown, the first bottom wall 2452 may include a main body portion 2452a and a bulged portion 2452b. The main body portion 2452a connects the bulged portion 2452b and the first side wall 2451, and the main body portion 2452a surrounds the outside of the bulged portion 2452b. Along the thickness direction X of the wall portion, the bulged portion 2452b bulges from the main body portion 2452a in the direction away from the electrode assembly 22, so as to form a fourth groove 2452c at a position corresponding to the bulged portion 2452b on the side of the first bottom wall 2452 facing the electrode assembly 22. The pressure relief groove 241 is disposed on the main body portion 2452a.

[0207] Among them, the first bottom wall 2452 is a structure that bulges locally in the thickness direction X of the wall portion in the direction away from the electrode assembly 22 to form the bulged portion 2452b, and the area where the first bottom wall 2452 does not bulge and connects the first side wall 2451 and the bulged portion 2452b is the main body portion 2452a, so that the main body portion 2452a is an annular structure surrounding the outside of the bulged portion 2452b, and a fourth groove 2452c is formed at a position corresponding to the bulged portion 2452b on the side of the first bottom wall 2452 facing the electrode assembly 22.

[0208] The pressure relief groove 241 is provided in the main body portion 2452a, that is to say, the pressure relief groove 241 is located between the arched portion 2452b and the first side wall 2451.

[0209] It should be noted that the first groove 244, the first protrusion 245, the pressure relief groove 241 and the arched portion 2452b of the pressure relief component 24 are all structures formed by stamping processes, so that the pressure relief component 24 has a structure protruding outward on both sides in the thickness direction X of the wall portion, which is convenient for the material flow form during the stamping process of the pressure relief groove 241 and reduces the stamping forming difficulty of the pressure relief groove 241.

[0210] In this embodiment, by setting a part of the first bottom wall 2452 of the first protrusion 245 to be arched in a 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 that surrounds the outside of the arched portion 2452b and connects the arched portion 2452b to the first side wall 2451. Among them, by arranging the pressure relief groove 241 on the main body portion 2452a, on the one hand, the difficulty of forming the pressure relief groove 241 on the first bottom wall 2452 can be reduced, and it is beneficial to improve the material flow form of the first bottom wall 2452 during the forming process of the pressure relief groove 241, so as to improve 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 is beneficial to alleviating phenomena such as deformation of the pressure relief component 24 during use, so as to improve the use reliability and stability of the pressure relief component 24.

[0211] In some embodiments, see Figure 7 As shown, the pressure relief groove 241 is arranged around the arched portion 2452b. That is to say, the pressure relief groove 241 is a circular 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 can also be an arc-shaped groove structure or a strip-shaped groove structure.

[0212] In this embodiment, by setting the pressure relief groove 241 as a circular structure arranged around the arched portion 2452b, when the pressure relief component 24 cracks as a whole along the pressure relief groove 241 during the pressure relief of the battery cell 20, the area of the first bottom wall 2452 forming the arched portion 2452b can be integrally detached, which is beneficial to expanding the pressure relief area of the battery cell 20, thereby further improving the pressure relief rate of the battery cell 20, so as to reduce the explosion or bursting risk of the battery cell 20 caused by untimely pressure relief, and further effectively improve the use reliability of the battery cell 20.

[0213] In some embodiments, see Figure 5 and Figure 7 As shown, along the thickness direction X of the wall portion, the pressure relief groove 241 is arranged on the side of the main body portion 2452a away from the electrode assembly 22.

[0214] In this embodiment, by disposing the pressure relief groove 241 on the side of the main body portion 2452a of the first bottom wall 2452 facing 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 portion 2452a of the first bottom wall 2452, facilitating the formation of the pressure relief groove 241 while forming the first groove 244 and the arched portion 2452b, and further improving the processing efficiency of the pressure relief component 24.

[0215] In some embodiments, the pressure relief groove 241 is formed by stamping on the main body portion 2452a.

[0216] In this embodiment, by setting the pressure relief groove 241 to be a structure formed by stamping on the main body portion 2452a of the first bottom wall 2452, on the one hand, the manufacturing difficulty of the pressure relief groove 241 can be reduced, which is beneficial to improving the processing efficiency of the pressure relief groove 241. On the other hand, in the structure where the pressure relief component 24 is formed with a first groove 244 and a first protrusion 245, and the first bottom wall 2452 of the first protrusion 245 is formed with an arched portion 2452b, it is convenient for the material flow to form during the stamping process of the pressure relief groove 241, which is beneficial to improving the processing consistency of the pressure relief groove 241 and improving the production quality of the pressure relief component 24.

[0217] According to some embodiments of the present application, refer to Figure 4 and Figure 5 As shown, the pressure relief component 24 is separately provided from the wall portion 211, and the pressure relief component 24 is welded to the wall portion 211. That is to say, the pressure relief component 24 and the wall portion 211 are of a split structure, 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 means of welding.

[0218] Among them, in the embodiment where the pressure relief component 24 is formed with 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 the 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 received 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 the bottom surface of the assembly groove 2112a.

[0219] In this embodiment, by welding the pressure relief component 24 to the wall portion 211, on the one hand, it can reduce the difficulty of setting the pressure relief component 24 on the outer shell 21, so as to reduce 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, so as to improve the assembly stability between the pressure relief component 24 and the wall portion 211, and can improve the effect of the pressure relief component 24 blocking the pressure relief hole 2111.

[0220] Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 can also be other structures. For example, the pressure relief component 24 and the wall portion 211 are integrally formed, that is, the pressure relief component 24 and the wall portion 211 are an integral structure, and 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.

[0221] 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 beneficial to improve the structural strength of the pressure relief component 24 connected to the wall portion 211, so as to reduce the risk of the pressure relief component 24 detaching from the wall portion 211 during use, thereby improving the use stability of the battery cell 20.

[0222] In some embodiments, the material of the outer shell 21 is the same as that of the pressure relief component 24.

[0223] It should be noted that the material of the outer shell 21 being 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 both the outer shell 21 and the pressure relief component 24 are single materials, such as copper or aluminum, etc., then the outer shell 21 and the pressure relief component 24 are both composed of the same metal elements; if the outer shell 21 and the pressure relief component 24 are alloy materials or mixed materials, such as aluminum alloy or steel, etc., then the same material of the outer shell 21 and the pressure relief component 24 means that the main components of the outer shell 21 and the pressure relief component 24 are the same. If only the content of the components of the outer shell 21 and the pressure relief component 24 is different, they are also the same material.

[0224] In this embodiment, by setting the material of the outer shell 21 and the pressure relief component 24 to be the same structure, it can achieve the structure of welding the pressure relief component 24 and the wall portion 211 with the same material, thereby improving the welding quality between the pressure relief component 24 and the wall portion 211, further improving the assembly quality between the pressure relief component 24 and the wall portion 211, and reducing the welding difficulty between the pressure relief component 24 and the wall portion 211.

[0225] According to some embodiments of the present application, the materials of the outer shell 21 and the pressure relief component 24 are both steel.

[0226] Exemplarily, the material of the outer casing 21 and the material of the pressure relief component 24 may be low-carbon steel, medium-carbon steel, high-carbon steel, or the like.

[0227] In this embodiment, by setting the materials of both the outer casing 21 and the pressure relief component 24 to steel, on the one hand, the structural strength of the outer casing 21 can be enhanced to alleviate the phenomenon of expansion and deformation of the outer casing 21 of the battery cell 20 during use, which is beneficial to reducing 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 enhanced to alleviate phenomena such as deformation of the pressure relief component 24 during use, thereby reducing phenomena such as fatigue damage of the pressure relief component 24, and further being beneficial to reducing the risk of premature valve opening and pressure relief of the battery cell 20, so as to improve the service life and reliability of the battery cell 20.

[0228] According to some embodiments of the present application, referring to Figure 3 and Figure 4 As shown, the outer casing 21 may include a housing 212 and an end cap 213. An accommodation cavity with an opening 2121 is formed inside the housing 212. The electrode assembly 22 is accommodated in the accommodation cavity, and the end cap 213 closes the opening 2121. The end cap 213 is the wall portion 211.

[0229] Among them, the end cap 213 is the wall portion 211. That is to say, the pressure relief component 24 is disposed on the end cap 213, and the insulating member 23 is disposed between the end cap 213 and the electrode assembly 22, such that the insulating member 23 is the lower plastic disposed on the side of the end cap 213 facing the electrode assembly 22.

[0230] In this embodiment, by setting the wall portion 211 of the outer casing 21 as the end cap 213 for closing the opening 2121 of the outer casing 21, the battery cell 20 with such a structure facilitates the assembly of the pressure relief component 24 on the end cap 213, thereby being beneficial to reducing the manufacturing difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0231] Of course, the structure of the battery cell 20 is not limited thereto. In some embodiments, the battery cell 20 may also be other structures. For example, referring to Figure 8 and Figure 9 As shown, the outer casing 21 may 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 encloses to form an opening 2121. The second bottom wall and the second side wall jointly define the accommodation cavity. The electrode assembly 22 is accommodated in the accommodation cavity, and the end cap 213 closes the opening 2121. The second bottom wall is the wall portion 211.

[0232] Among them, the housing 212 includes an integrally formed second bottom wall and a second side wall. That is to say, the second bottom wall and the second side wall of the housing 212 are structures formed by an integral molding process to form a receiving cavity with an opening 2121 inside the housing 212, such as a stamping process or a casting process, etc.

[0233] The second bottom wall is the wall portion 211. That is to say, the pressure relief component 24 is disposed on the second bottom wall of the housing 212, and the insulating member 23 is disposed between the second bottom wall of the housing 212 and the electrode assembly 22, such that the insulating member 23 is a bottom support plate disposed on the side of the second bottom wall of the housing 212 facing the electrode assembly 22.

[0234] In this embodiment, by setting the wall portion 211 of the outer shell 21 as the second bottom wall of the housing 212 disposed opposite to the end cap 213 in the thickness direction X of the wall portion, the battery cell 20 with such a structure can achieve that the area of the outer shell 21 provided with the pressure relief component 24 is far from the end cap 213, so as to effectively relieve the phenomenon that the stress generated by the connection between the end cap 213 and the housing 212 acts on the pressure relief component 24, thereby reducing the influence on the pressure relief component 24, and further being beneficial to reducing the risk of cracking or structural strength decline of the pressure relief component 24 under the pulling action of stress, so as to improve the service life and service reliability of the battery cell 20.

[0235] According to some embodiments of the present application, the present application also provides a battery 100, and the battery 100 includes the battery cell 20 of any of the above solutions.

[0236] Among them, referring to Figure 2 as shown, the battery 100 may further include a box body 10, and the battery cell 20 is accommodated in the box body 10.

[0237] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 are covered with each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20.

[0238] Optionally, the second box body 12 may be a hollow structure with one end open, the first box body 11 may be a plate-like structure, and 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 jointly define an assembly space; the first box body 11 and the second box body 12 may also both 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.

[0239] Of course, the box body 10 formed by the first box body 11 and the second box body 12 may be in various shapes, such as a cylinder or a cuboid, etc. Exemplarily, in Figure 2Among them, the box body 10 has a cuboid structure.

[0240] Optionally, the battery cells 20 disposed in the box body 10 can be one or more. Exemplarily, in Figure 2 Among them, multiple battery cells 20 are disposed in the box body 10 of the battery 100. The multiple battery cells 20 can be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10. Of course, the battery 100 can also be in the form that multiple battery cells 20 are first connected in series, in parallel, or in a combined series-parallel connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box body 10.

[0241] Among them, the battery 100 can also include other structures. For example, the battery 100 can also include a busbar component that connects the multiple battery cells 20 to achieve electrical connection among the multiple battery cells 20.

[0242] It should be noted that in some embodiments, the battery 100 may not be provided with the box body 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of the multiple battery cells 20 can be directly assembled to the electrical device to provide electrical energy for the electrical device through the multiple battery cells 20. That is to say, the box body 10 can be a part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the box body 10 can be a part of the chassis structure of the vehicle 1000. For example, a part of the box body 10 can become at least a part of the floor of the vehicle 1000, or a part of the box body 10 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0243] According to some embodiments of the present application, the present application also provides an electrical device, which includes the battery cells 20 in any of the above solutions, and the battery cells 20 are used to provide electrical energy for the electrical device.

[0244] Among them, the electrical device can be any of the foregoing devices or systems that apply the battery cells 20.

[0245] It should be noted that without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0246] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A housing having a wall portion, the wall portion being provided with a pressure relief component, the pressure relief component being configured to release the internal pressure of the battery cell; an electrode assembly, contained in the housing; as well as an insulating member, disposed on a side of the wall portion facing the electrode assembly, the insulating member being configured to insulate and isolate the wall portion from the electrode assembly; Among them, along the thickness direction of the wall portion, the wall portion has a first surface facing the electrode assembly, at least part of the pressure relief component protrudes from the first surface, and a avoidance portion is formed on the side of the insulating member facing the wall portion, and the avoidance portion accommodates the part of the pressure relief component protruding from the first surface.

2. The battery cell according to claim 1, characterized in that: The pressure relief component is separately arranged and connected to the wall portion, and along the thickness direction of the wall portion, the projection of the pressure relief component is entirely located within the avoidance portion.

3. The battery cell according to claim 1, characterized in that: The pressure relief component has a second surface and a third surface opposite to each other along the thickness direction of the wall portion, the third surface is arranged 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 able to be 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.

4. The battery cell according to claim 3, characterized in that: Along the thickness direction of the wall portion, the insulating member has a fourth surface abutting against the first surface, the avoidance portion includes a second groove, the second groove is recessed from the fourth surface toward the electrode assembly, so as to form a second protrusion at a side of the insulating member facing the electrode assembly and corresponding to the position of the second groove, and the second protrusion abuts against the electrode assembly; The second groove accommodates at least a portion of the first protrusion.

5. The battery cell according to claim 4, characterized in that: The second protrusion is provided with a through hole, and the through hole is communicated with the second groove.

6. The battery cell according to claim 4, characterized in that: The avoidance portion further includes a third groove, the third groove is recessed from the fourth surface toward the electrode assembly, and the third groove passes through the groove side surface of the second groove; Among them, 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 part of the first protrusion, and the third groove accommodates the part of the first protrusion located outside the second groove.

7. The battery cell according to claim 6, characterized in that: 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 0.1 mm≤D1≤1.5 mm.

8. The battery cell according to claim 3, characterized in that: The insulating member comprises: a body portion, disposed between the wall portion and the electrode assembly along a thickness direction of the wall portion; an abutting portion connected to a side of the main body portion facing the wall portion, and the abutting portion abuts against the first surface; Wherein, along the thickness direction of the wall portion, the projection of the abutting portion does not overlap with the projection of the first protrusion, so as to form a spacing space between the main body portion and the first surface, and the spacing space is the avoidance portion.

9. The battery cell according to claim 8, characterized in that: The insulating member includes a plurality of the abutting portions, each of the plurality of the abutting portions is connected to a side of the main body portion facing the wall portion, and the plurality of the abutting portions are arranged at intervals.

10. The battery cell according to claim 8, characterized in that: Along the thickness direction of the wall portion, the minimum distance between the main body portion and the first protrusion is D2, satisfying 0.1 mm≤D2≤1.5 mm.

11. The battery cell according to claim 3, characterized in that: 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 an assembly groove, the pressure relief hole passes through the bottom surface of the assembly groove, and along the thickness direction of the wall portion, part of the pressure relief component is accommodated in the assembly groove, and the second surface abuts against the bottom surface of the assembly groove.

12. The battery cell according to claim 11, characterized in that: The first surface is coplanar with the third surface.

13. The battery cell according to any one of claims 3 to 12, characterized in that: The first protrusion includes a first side wall and a first bottom wall, the first side wall is arranged around the first bottom wall, and the first side wall is connected to the first bottom wall, 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.

14. The battery cell according to claim 13, characterized in that: The first bottom wall includes a main body portion and an arched portion, the main body portion connects the arched portion and the first side wall, and the main body portion surrounds the outer side of the arched portion; Among them, 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, and the pressure relief groove is arranged in the main body.

15. The battery cell according to claim 14, characterized in that: The pressure relief groove is arranged around the arched portion.

16. The battery cell according to claim 14, characterized in that: Along the thickness direction of the wall portion, the pressure relief groove is arranged on a side of the main body portion away from the electrode assembly.

17. The battery cell according to claim 14, characterized in that: The pressure relief groove is stamped and formed on the main body.

18. The battery cell according to claim 1, characterized in that: The pressure relief component is separately arranged from the wall portion, and the pressure relief component is welded and connected to the wall portion.

19. The battery cell according to claim 18, characterized in that: The material of the shell is the same as that of the pressure relief component.

20. The battery cell according to claim 1, characterized in that: The pressure relief component is integrally formed with the wall portion.

21. The battery cell according to claim 1, characterized in that: The shell and the pressure relief component are both made of steel.

22. The battery cell according to claim 1, characterized in that: The housing comprises: A housing having an opening formed therein, wherein the electrode assembly is accommodated in the housing; an end cap for closing the opening; Wherein, the end cover is the wall portion.

23. The battery cell according to claim 1, characterized in that: The housing comprises: The shell comprises an integrally formed second bottom wall and a second side wall, wherein the second side wall is arranged around the second bottom wall, along the thickness direction of the wall portion, one end of the second side wall is connected to the second bottom wall, and the other end is enclosed to form an opening, and the second bottom wall and the second side wall jointly define a containing cavity, and the electrode assembly is contained in the containing cavity; an end cap for closing the opening; Wherein, the second bottom wall is the wall portion.

24. A battery, characterized in that: Comprising the battery cell according to any one of claims 1-23.

25. An electrical device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 23, wherein the battery cell is used to provide electrical energy.

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