Battery cell, battery, and electric device
Patent Information
- Application Number
- PCT/CN2024/109864
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-03-04
- Filing Date
- 2024-08-05
- Publication Date
- 2025-10-02
AI Technical Summary
After the end caps of existing battery cells are welded, bulges are formed at the edges, causing stress concentration and affecting the battery's service life and reliability.
A protrusion is provided on the base of the end cover so that its protruding distance is greater than or equal to the protruding distance of the edge. The protrusion bears the force to disperse or eliminate the force at the edge, thereby optimizing the stress distribution.
The risk of damage to the welding position is reduced, the stress distribution within the battery is optimized, and the battery life and reliability are improved.
Smart Images
Figure CN2024109864_02102025_PF_FP_ABST
Abstract
Description
Battery cells, batteries and electrical devices
[0001] CROSS-REFERENCE TO RELATED APPLICATIONS
[0002] This application claims priority to Chinese patent application No. 202420411725.9, filed on March 4, 2024, entitled “Battery Cell, Battery and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field
[0003] The present application belongs to the field of battery technology, and in particular relates to a battery cell, a battery, and an electrical device. Background Art
[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.
[0005] Current battery cell end caps feature a stepped design. This creates a bulge at the edge after the end caps are welded to the housing. This creates localized stress concentration at the edge when the cell is assembled within the battery, impacting battery life. Therefore, optimizing stress distribution within the battery has become a pressing issue.
[0006] Summary of the Invention
[0007] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can reduce the force at the edge, optimize the stress distribution and improve the battery life.
[0008] In a first aspect, the present application provides a battery cell comprising a housing and an electrode assembly, wherein the housing comprises a wall portion and an end cap, wherein the wall portion encloses a receiving cavity open in a first direction, the end cap being disposed over the opening, the end cap comprising a base and a rim disposed around the outer periphery of the base, the rim being connected to the wall portion and projecting relative to the base in a first direction away from the wall portion, and the electrode assembly being disposed in the receiving cavity. The base is provided with a protrusion, the protrusion being disposed on a side of the base away from the wall portion, and wherein the protrusion distance relative to the base in the first direction is greater than or equal to the protrusion distance relative to the rim.
[0009] In the embodiment of the present application, a protrusion is provided on the base of the end cover, and the protruding distance of the protrusion relative to the base is greater than or equal to the protruding distance of the edge relative to the base. Therefore, when the battery cell is set in the battery pack, the battery cell can bear the force through the protrusion, thereby dispersing or eliminating the force at the edge, optimizing the stress distribution, and improving the battery life.
[0010] In some embodiments, the edge and the protrusion are offset from the base in the first direction, and in the second direction, the edge and the protrusion are spaced apart, and the second direction intersects with the first direction, so that the end cover and the wall can be positioned and matched while the protrusion is set, thereby improving the reliability of the battery cell.
[0011] In some embodiments, the protrusion and the base are configured as an integral structure, and the protrusion can be formed by stamping the base along a first direction to simplify the preparation process of the end cap, reduce the weight of the end cap, and lower the cost.
[0012] In some embodiments, the thickness of the protrusion along the first direction is equal to the thickness of the base along the first direction, which is more convenient for stamping and helps to increase the service life of the stamping die.
[0013] In some embodiments, the orthographic projection area of the protrusion along the first direction is greater than or equal to half the orthographic projection area of the edge along the first direction. By increasing the area of the protrusion to more than half the area of the edge, the stress on the edge can be effectively reduced, thereby better optimizing the stress distribution of the battery and extending the battery life.
[0014] In some embodiments, an opening is formed on one side of the accommodating cavity in the first direction, and the end cover includes a first cover plate, which is arranged to cover the opening; alternatively, an opening is formed on both sides of the accommodating cavity in the first direction, and the end cover includes a first cover plate and a second cover plate, which are respectively arranged to cover the openings on both sides.
[0015] In some embodiments, the first cover plate is provided with a pressing area for supporting the pressure plate, and the protrusion of the first cover plate is at least partially provided in the pressing area so as to utilize the protrusion to bear the force, disperse or eliminate the force at the edge, and optimize the force on the battery.
[0016] In some embodiments, a pressure relief mechanism is provided on the first cover plate, and the protrusion of the first cover plate is at least partially located on the peripheral side of the pressure relief mechanism, which can increase the structural strength of the pressure relief mechanism, reduce the pulling of the expansion force on the pressure relief mechanism, and improve the life of the pressure relief structure.
[0017] In some embodiments, the battery cell further includes an insulating member disposed in the accommodating cavity, and the electrode assembly is supported on the second cover plate through the insulating member.
[0018] In some embodiments, the protrusion of the second cover is at least partially located within the positive projection range of the insulating member along the first direction. The insulating member is provided with a support portion protruding toward the second cover, and the insulating member abuts against the protrusion of the second cover through the support portion.
[0019] In the embodiment of the present application, when the area of the protrusion is large, a support portion can be provided on the insulating member, and the support portion can be abutted against the protrusion to support the insulating member through the base and the protrusion, thereby increasing the contact area between the insulating member and the second cover plate, reducing stress concentration between the insulating member and the second cover plate, and optimizing the stress distribution of the battery cell.
[0020] In a second aspect, an embodiment of the present application provides a battery comprising the battery cell of the first aspect.
[0021] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery in a second direction, the battery being used to provide electrical energy.
[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.
[0024] FIG1 is a schematic structural diagram of a battery cell in the prior art;
[0025] FIG2 is a partial enlarged view of the edge of a battery end cover in the prior art;
[0026] FIG3 is a schematic diagram of the structure of a battery cell assembled in a battery in the prior art;
[0027] FIG4 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;
[0028] FIG5 is an exploded view of a battery provided in some embodiments of the present application;
[0029] FIG6 is a schematic structural diagram of a battery cell according to some embodiments of the present application;
[0030] FIG7 is an exploded view of a battery cell provided in some embodiments of the present application;
[0031] FIG8 is a schematic structural diagram of a battery cell provided in some other embodiments of the present application;
[0032] FIG9 is a schematic structural diagram of a battery cell from another angle provided in some embodiments of the present application;
[0033] FIG10 is a cross-sectional view taken along the AA direction in FIG6 ;
[0034] FIG11 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;
[0035] FIG12 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application.
[0036] In the accompanying drawings, the drawings are not necessarily drawn to scale.
[0037] Marking instructions: 100 battery, 200 controller, 300 motor; 10 battery cell; 20 pressure plate; 30 bottom plate; 1 shell, 11 wall, 12 end cover, 121 base, 122 edge, 12a first cover plate, 121a pressure relief mechanism, 12b second cover plate, 13 protrusion, 2 electrode assembly, 3 insulating member, 31 support portion; X second direction, Z first direction. DETAILED DESCRIPTION
[0038] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.
[0039] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.
[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.
[0041] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.
[0042] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.
[0043] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.
[0044] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.
[0045] Please refer to Figures 1 to 3. Figure 1 is a structural schematic diagram of a battery cell 10 in the prior art, Figure 2 is a partial enlarged view of the edge 122 of the battery end cover 12 in the prior art, and Figure 3 is a structural schematic diagram of the battery cell 10 assembled in the battery 100 in the prior art.
[0046] The applicant has noticed that in the existing battery 100, the end cover 12 is often welded to the wall 11 of the shell 1 by tailor welding. The end cover 12 adopts a step design, and the welding of the end cover 12 and the wall 11 is achieved by matching the step with the wall 11.
[0047] However, after the end cap 12 is welded to the wall portion 11, the aforementioned end cap structure forms a protrusion at the edge 122 of the end cap 12. When the battery cell 10 is assembled into the battery 100, the battery cell 10 abuts against the plates on either side, namely, the pressure plate 20 and the bottom plate 30, via the edge 122, causing stress to be applied to the edge 122. On the one hand, this edge 122 is the weld area, i.e., the weakest area of the battery cell 10, so stress applied to this edge 122 increases the risk of damage to the battery 100. On the other hand, the contact area between the edge 122 and the plates on either side is small, which can easily lead to localized stress concentration in the battery 100, affecting the reliability of the battery 100 and reducing its service life.
[0048] Based on the above considerations, and in order to optimize the stress distribution within the battery 100, the applicant, after in-depth research, has designed a battery cell 10 in which a protrusion 13 is provided on the end cap 12 of the battery cell 10, and the protrusion distance of the protrusion 13 is greater than or equal to the protrusion distance of the protrusion at the edge 122. In such a battery cell 10, when the battery cell 10 is assembled within the battery 100, the battery cell 10 can contact the plate body of the battery 100 via the protrusion 13, reducing the load at the edge 122, thereby reducing the risk of damage to the weld location, optimizing the stress distribution of the battery 100, and improving the service life of the battery 100.
[0049] The technical solutions described in the embodiments of the present application are applicable to the battery 100 and an electrical device using the battery 100 .
[0050] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.
[0051] It should be understood that the technical solutions described in the embodiments of the present application are applicable to all electrical devices including the battery 100 and using the battery 100. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.
[0052] Please refer to FIG4 , which is a schematic structural diagram of a vehicle provided in some embodiments of the present application.
[0053] The vehicle is equipped with a battery 100, which can be located at the bottom, front, or rear of the vehicle. Battery 100 can be used to power the vehicle, for example, as an operating power source. The vehicle also includes a controller 200 and a motor 300. The controller 200 controls the battery 100 to power the motor 300, for example, to meet the vehicle's starting, navigation, and driving needs.
[0054] Please refer to FIG5 , which is a schematic diagram of an explosion of a battery 100 provided in some embodiments of the present application.
[0055] The battery 100 referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells 10 to provide higher voltage and capacity. For example, the battery 100 referred to in this application may include a battery module or a battery pack. The battery 100 generally also includes a casing for enclosing the one or more battery cells 10. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells 10.
[0056] In the present application, the battery cell 10 includes, but is not limited to, a lithium-ion secondary battery cell 10, a lithium-ion primary battery cell 10, a lithium-sulfur battery cell 10, a sodium-lithium-ion battery cell 10, a sodium-ion battery cell 10, or a magnesium-ion battery cell 10. The battery cell 10 includes, but is not limited to, a cylindrical, flat, rectangular, or other shapes.
[0057] Please refer to Figures 6 and 7. Figure 6 is a schematic diagram of the structure of a battery cell 10 provided in some embodiments of the present application from one angle, and Figure 7 is a schematic diagram of the exploded structure of a battery cell 10 provided in some embodiments of the present application. A battery cell 10 is the smallest unit that makes up a battery 100. A battery cell 10 includes a housing 1, an electrode assembly 2, and other functional components. The electrode assembly 2 is the component within the battery cell 10 where the electrochemical reaction occurs. The housing 1 may contain one or more electrode assemblies 2.
[0058] The shell 1 includes a wall portion 11 and an end cap 12. The end cap 12 refers to a component that covers the opening of the shell 1 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap 12 can be adapted to the shape of the shell 1 to match the shell 1. Optionally, the end cap 12 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 12 is not easily deformed when squeezed or collided, so that the battery cell 10 can have a higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on the end cap 12.
[0059] The wall portion 11 is a component used to cooperate with the end cap 12 to form the internal environment of the battery cell 10. The formed internal environment can be used to accommodate the electrode assembly 2, electrolyte, and other components. The wall portion 11 and the end cap 12 can be independent components. The wall portion 11 can be provided with an opening, and the end cap 12 is closed at the opening to form the internal environment of the battery cell 10.
[0060] According to some embodiments of the present application, referring to Figures 6 and 7, the present application provides a battery cell 10, which includes a housing 1 and an electrode assembly 2. The housing 1 includes a wall portion 11 and an end cap 12. The wall portion 11 encloses a receiving cavity that is open in a first direction Z. The end cap 12 is disposed in the opening. The end cap 12 includes a base 121 and a rim 122 disposed around the periphery of the base 121. The rim 122 is connected to the wall portion 11 and protrudes relative to the base 121 in the first direction Z, away from the wall portion 11. The electrode assembly 2 is disposed in the receiving cavity. A protrusion 13 is disposed on the base 121. The protrusion 13 is disposed on a side of the base 121 away from the wall portion 11. In the first direction Z, the protrusion 13 protrudes relative to the base 121 by a distance greater than or equal to the distance that the rim 122 protrudes relative to the base 121.
[0061] In the embodiment of the present application, a protrusion 13 is provided on the base 121 of the end cover 12, and the protrusion distance of the protrusion 13 relative to the base 121 is greater than or equal to the protrusion distance of the edge 122 relative to the base 121. Therefore, when the battery cell 10 is assembled in the battery 100, the battery cell 10 can bear the force through the protrusion 13, thereby dispersing or eliminating the force at the edge 122, optimizing the stress distribution, and improving the service life of the battery 100.
[0062] Specifically, the protruding distance of the protruding portion 13 relative to the base 121 is greater than or equal to the protruding distance of the edge 122 relative to the base 121, which includes two situations.
[0063] One is that the protrusion distance of the protrusion 13 relative to the base 121 is greater than the protrusion distance of the edge 122 relative to the base 121. When the battery cell 10 is assembled in the battery 100, the battery cell 10 contacts the plate body of the battery 100 through the protrusion 13, so that the protrusion 13 can bear the force. In this case, the edge 122 is not subjected to the force, thereby reducing the risk of damage to the welding position and improving the service life of the battery 100.
[0064] The other is that the protrusion distance of the protrusion 13 relative to the base 121 is equal to the protrusion distance of the edge 122 relative to the base 121, that is, the protrusion 13 is flush with the edge 122. When the battery cell 10 is assembled in the battery 100, the protrusion 13 and the edge 122 of the battery cell 10 are in contact with the plate body of the battery 100, thereby increasing the contact area between the battery cell 10 and the battery plate body. By simultaneously utilizing the protrusion 13 and the edge 122 to bear force, the force at the edge 122 is dispersed, and the stress distribution of the battery 100 is optimized, thereby improving the service life of the battery 100.
[0065] It can be understood that the specific protruding distance of the protrusion 13 relative to the base 121 can be adjusted according to the structure of the battery cell 10, as long as the protruding distance of the protrusion 13 relative to the base 121 is greater than or equal to the protruding distance of the edge 122 relative to the base 121, so as to achieve contact between the protrusion 13 and the upper plate of the battery pack.
[0066] In some optional embodiments, the edge 122 and the protrusion 13 are staggered with respect to the base 121 in the first direction Z, and the edge 122 and the protrusion 13 are spaced apart in the second direction X, and the second direction X intersects with the first direction Z.
[0067] The edge 122 and the protrusion 13 are offset from the base 121 in the first direction Z. This means that the edge 122 and the protrusion 13 are at different heights relative to the base 121 along the first direction Z. This allows the edge 122 and the protrusion 13 to protrude relative to the base 121 on the side of the end cap 12 facing away from the wall 11, while the base 121 to protrude relative to the edge 122 and the protrusion 13 on the side of the end cap 12 facing the wall 11. Furthermore, by spacing the edge 122 and the protrusion 13 apart in the second direction X, the base 121 can enclose the edge 122 on the side of the end cap 12 facing the wall 11 to form a groove, which is engaged with the wall 11. This allows the protrusion 13 to be provided while simultaneously achieving the positioning and engagement of the end cap 12 with the wall 11, thereby improving the reliability of the battery cell 10.
[0068] It is understandable that the protrusion 13 and the base 121 can be set as an integral structure. For example, the protrusion 13 can be formed by stamping the base 121 along the first direction Z to simplify the preparation process of the end cover 12, reduce the weight of the end cover 12, and reduce costs.
[0069] Optionally, the thickness of the protrusion 13 along the first direction Z is equal to the thickness of the base 121 along the first direction Z. By making the thickness of the protrusion 13 consistent with that of the base 121, stamping is more convenient, which is beneficial to improving the service life of the stamping die.
[0070] In some optional embodiments, the orthographic projection area of the protrusion 13 along the first direction Z is greater than or equal to half of the orthographic projection area of the edge 122 in the first direction Z.
[0071] By increasing the area of the protrusion 13 and making the area of the protrusion 13 reach more than half of the area of the edge 122, the force on the edge 122 can be effectively reduced. For example, when the area of the protrusion 13 is equal to half of the area of the edge 122, the force at the edge 122 can be reduced to 30%, thereby better optimizing the stress distribution of the battery 100 and improving the service life of the battery 100.
[0072] Please refer to Figures 6, 8 and 9 together. Figures 6 and 8 show the structural schematic diagrams of the battery cell 10 on the first cover plate 12a side in some embodiments of the present application, and Figure 9 shows the structural schematic diagram of the battery cell 10 on the second cover plate 12b side in some embodiments of the present application.
[0073] It should be noted that the wall portion 11 encloses a accommodating cavity that is open in the first direction Z, and includes: the wall portion 11 includes a bottom wall and side walls arranged around the bottom wall, the bottom wall and the side walls enclose the accommodating cavity, and the accommodating cavity has an opening only on one side along the first direction Z, or the wall portion 11 includes multiple side walls, which are used to surround the electrode assembly 2 and enclose the accommodating cavity to form an accommodating cavity, and the accommodating cavity has openings at both ends of the first direction Z.
[0074] Correspondingly, in some optional embodiments, when the accommodating cavity has an opening only on one side along the first direction Z, the end cover 12 may only include a first cover plate 12a, and the first cover plate 12a covers the opening; or, when the accommodating cavity has openings on both sides in the first direction Z, the end cover 12 includes a first cover plate 12a and a second cover plate 12b, and the first cover plate 12a and the second cover plate 12b respectively cover the openings on both sides.
[0075] Among them, the first cover plate 12a is the top cover plate, and the second cover plate 12b is the bottom cover plate. Therefore, when the battery cell 10 is assembled in the battery 100, the pressure plate 20 is pressed against the first cover plate 12a, and the bottom plate 30 is pressed against the second cover plate 12b, thereby limiting the battery cell 10 and improving the stability of the battery cell 10.
[0076] Since the structures of the first cover plate 12a and the second cover plate 12b are different, and the stress conditions of the first cover plate 12a, the second cover plate 12b and the upper plate of the battery 100 are also different, it is necessary to adjust the specific positions of the protrusions 13 on the first cover plate 12a and the second cover plate 12b respectively.
[0077] Please refer to Figures 6 and 8. With respect to the first cover plate 12a, in some optional embodiments, the first cover plate 12a is provided with a crimping area for supporting the pressure plate 20, and the protrusion 13 of the first cover plate 12a is at least partially provided in the crimping area so as to utilize the protrusion 13 to bear the force, disperse or eliminate the force at the edge 122, and optimize the force on the battery 100.
[0078] Optionally, in the crimping area of the shoulder of the battery cell 10, the protrusion 13 of the first cover plate 12a can be partially and entirely raised to increase the crimping area between the battery cell 10 and the pressure plate 20 by increasing the area of the protrusion 13, and by making the protrusion partially and entirely raised, the internal space of the battery cell 10 can also be increased, thereby improving the energy density of the battery 100.
[0079] In some optional embodiments, a pressure relief mechanism 121a is provided on the first cover plate 12a, and the protrusion 13 is at least partially located around the pressure relief mechanism 121a. The pressure relief mechanism 121a includes, but is not limited to, an explosion-proof valve, a bursting disc, and a combination of an explosion-proof valve and a bursting disc, and is designed to ensure that when the pressure in the accommodation chamber is excessive, the pressure can be exhausted and relieved through the pressure relief mechanism 121a.
[0080] When functional components such as a pressure relief mechanism 121a are also provided on the first cover plate 12a, the protrusion 13 can also be provided on the peripheral side of the pressure relief mechanism 121a, thereby optimizing the stress distribution of the battery 100 while increasing the structural strength of the pressure relief mechanism 121a, reducing the pulling of the expansion force on the pressure relief mechanism 121a, and improving the life of the pressure relief structure.
[0081] Please refer to Figures 9 to 11. Figure 11 shows a partial cross-sectional view of the battery cell 10 provided in some embodiments of the present application. With respect to the second cover plate 12b, in addition to being crimped with the bottom plate 30, the second cover plate 12b also needs to support the electrode assembly 2 in the accommodating cavity. In some optional embodiments, the battery cell 10 also includes an insulating member 3, which is arranged in the accommodating cavity, and the electrode assembly 2 is supported on the second cover plate 12b through the insulating member 3.
[0082] Optionally, on the second cover plate 12b, the protrusion 13 can be extended along the circumference of the base to form a ring structure, the protrusion 13 can also be arranged on a partial surface to form a plate structure, and the protrusion 13 can also be arranged at intervals on the base 121, that is, the shape and size of the protrusion 13 can be adjusted according to the specific structure of the battery 100.
[0083] It can be understood that when the protrusion 13 and the base 121 are offset along the first direction Z, on the side surface of the end cover 12 facing the wall 11, the base 121 is raised relative to the edge 122 and the protrusion 13, so the electrode assembly 2 is supported on the base 121 through the insulating part 3.
[0084] In some embodiments, when the area of the protrusion 13 is small, for example, when the protrusion 13 is set as a local small-area rib design, the area of the base 121 is large, so the insulating part 3 can be directly set on the base 121 to support the insulating part 3 through the base 121.
[0085] Please refer to FIG. 12 , which shows a partial cross-sectional view of a battery cell 10 provided in some other embodiments of the present application.
[0086] In other embodiments, when the area of the protrusion 13 is large, for example, when the protrusion 13 is partially provided on the entire surface, the area of the base 121 is small. Therefore, on this basis, the protrusion 13 of the second cover plate 12b is at least partially located within the positive projection range of the insulating member 3 along the first direction Z of the second cover plate 12b, and the insulating member 3 is provided with a support portion 31 protruding toward the second cover plate 12b, and the insulating member 3 is abutted against the protrusion 13 of the second cover plate 12b through the support portion 31.
[0087] By providing the support portion 31 on the insulating member 3, the support portion 31 can abut against the protrusion 13, so that the insulating member 3 can be supported by the base 121 and the protrusion 13, thereby increasing the contact area between the insulating member 3 and the second cover plate 12b, reducing the stress concentration between the insulating member 3 and the second cover plate 12b, and optimizing the stress distribution of the battery cell 10.
[0088] Optionally, the support portion 31 can match the protrusion 13, that is, the positive projection of the support portion 31 on the second cover plate 12b along the first direction Z coincides with the protrusion 13, further increasing the contact area between the insulating member 3 and the second cover plate 12b and optimizing the stress distribution.
[0089] According to some embodiments of the present application, please refer to Figures 4 to 12. The present application provides a battery cell 10, wherein the wall portion 11 includes multiple side walls, which enclose a receiving cavity with openings on both sides, and the end cover 12 includes a first cover plate 12a and a second cover plate 12b, and the first cover plate 12a and the second cover plate 12b are respectively covered with the openings on both sides. The first cover plate 12a and the second cover plate 12b are both provided with a protrusion 13. Referring to Figure 11, the thickness H1 of the protrusion 13 along the first direction Z is equal to the thickness H2 of the base 121 along the first direction Z. The protrusion 13 is integrally stamped from the base 121, and in the first direction Z, the protruding distance L1 of the protrusion 13 relative to the base 121 is equal to the protruding distance L2 of the edge 122 relative to the base 121. Therefore, when the battery cell 10 is assembled in the battery 100, the protrusion 13 and the edge 122 of the battery cell 10 are in contact with the plate body of the battery 100, increasing the contact area between the battery cell 10 and the battery plate body. By simultaneously utilizing the protrusion 13 and the edge 122 to bear force, the force at the edge 122 is dispersed, and the stress distribution of the battery 100 is optimized, thereby improving the service life of the battery 100.
[0090] According to some embodiments of the present application, the present application further provides a battery 100 comprising the battery cell 10 described in any of the above solutions.
[0091] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 100 described in any of the above schemes, and the battery 100 is used to provide electrical energy to the electrical device.
[0092] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .
[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
Claims
1. A battery cell, comprising: The housing comprises a wall portion and an end cap, the wall portion enclosing a receiving cavity open in a first direction, the end cap covering the opening, the end cap comprising a base and an edge surrounding the outer periphery of the base, the edge being connected to the wall portion and protruding relative to the base in the first direction toward a side away from the wall portion; an electrode assembly, disposed in the accommodating cavity; The base is provided with a protrusion, which is provided on a side of the base away from the wall portion, and in the first direction, a protruding distance of the protrusion relative to the base is greater than or equal to a protruding distance of the edge relative to the base.
2. The battery cell according to claim 1, wherein: The edge and the protrusion are staggered with respect to the base in the first direction, and the edge and the protrusion are spaced apart in a second direction, and the second direction intersects with the first direction.
3. The battery cell according to claim 2, wherein: The protrusion and the base are configured as an integral structure.
4. The battery cell according to claim 2, wherein: The thickness of the protrusion along the first direction is equal to the thickness of the base along the first direction.
5. The battery cell according to claim 1, wherein An orthographic projection area of the protrusion along the first direction is greater than or equal to half an orthographic projection area of the edge along the first direction.
6. The battery cell according to any one of claims 1 to 5, wherein: The accommodating cavity is formed with the opening on one side in the first direction, and the end cover includes a first cover plate, and the first cover plate is arranged to cover the opening; Alternatively, the accommodating cavity is formed with the openings on both sides in the first direction, and the end cover includes a first cover plate and a second cover plate, and the first cover plate and the second cover plate are respectively arranged to cover the openings on both sides.
7. The battery cell according to claim 6, wherein: The first cover plate is provided with a pressing area for supporting a pressing plate, and the protruding portion of the first cover plate is at least partially provided in the pressing area.
8. The battery cell according to claim 6, wherein: The first cover plate is provided with a pressure relief mechanism, and the protrusion of the first cover plate is at least partially located on the peripheral side of the pressure relief mechanism.
9. The battery cell according to claim 6, wherein: The battery cell further includes an insulating member disposed in the accommodating cavity, and the electrode assembly is supported on the second cover plate via the insulating member.
10. The battery cell according to claim 9, wherein: The protruding portion of the second cover plate is at least partially located within the orthographic projection range of the insulating member on the second cover plate along the first direction; The insulating member is provided with a supporting portion protruding toward the second cover plate. The protruding portions of the second cover plates abut against each other.
11. A battery comprising the battery cell according to any one of claims 1 to 10.
12. An electrical device comprising the battery according to claim 11, wherein the battery is used to provide electrical energy.