Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, the battery monomer comprises a shell and an electrode assembly, the shell comprises a wall part and an end cover, the wall part encloses to form a containing cavity with an opening in a first direction, the end cover covers the opening, the end cover comprises a base body and an edge surrounding the periphery of the base body, and the edge is arranged on the base body. The edge is connected with the wall part and protrudes towards the side away from the wall part relative to the base body in the first direction, and the electrode assembly is arranged in the containing cavity. The base body is provided with a protruding part, the protruding part is arranged on the side, away from the wall part, of the base body, and in the first direction, the protruding distance, relative to the base body, of the protruding part is larger than or equal to the protruding distance, relative to the base body, of the edge. According to the battery monomer, the battery and the power utilization device in the embodiment of the invention, the stress at the edge can be reduced, the stress distribution is optimized, and the service life of the battery is prolonged.

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] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In current battery cells, the end caps are designed with steps, so after the end caps are welded to the shell, a bulge will be formed at the edge. Therefore, when the battery cells are assembled in the battery, local stress concentration will be formed at the edge, affecting the battery life. Therefore, how to optimize the stress distribution in the battery has become an urgent problem to be solved. Utility Model Content

[0004] 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 increase the battery life.

[0005] In the first aspect, the present application provides a battery cell, including a shell and an electrode assembly, the shell including a wall portion and an end cap, the wall portion encloses a receiving cavity opening in a first direction, the end cap is arranged on the opening, the end cap includes a base and an edge arranged around the outer periphery of the base, the edge is connected to the wall portion and is arranged to protrude relative to the base in a first direction toward a side away from the wall portion, and the electrode assembly is arranged in the receiving cavity. The base is provided with a protrusion, the protrusion is arranged on a side of the base away from the wall portion, and in the first direction, the protrusion distance of the protrusion relative to the base is greater than or equal to the protrusion distance of the edge relative to the base.

[0006] In the embodiment of the present application, a protrusion is provided on the base of the end cover, and the protrusion distance of the protrusion relative to the base is greater than or equal to the protrusion distance of the edge relative to the base. Therefore, when the battery cell is arranged 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.

[0007] 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.

[0008] 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 cover, reduce the weight of the end cover, and reduce the cost.

[0009] 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.

[0010] In some embodiments, the orthographic projection area of ​​the protrusion along the first direction is greater than or equal to half of the orthographic projection area of ​​the edge in the first direction. By increasing the area of ​​the protrusion and making the area of ​​the protrusion reach more than half of the area of ​​the edge, the force on the edge can be effectively reduced, thereby better optimizing the stress distribution of the battery and improving the service life of the battery.

[0011] 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 covered on the opening; alternatively, openings are 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 covered on the openings on both sides.

[0012] In some embodiments, the first cover plate is provided with a crimping area for supporting the pressure plate, and the protrusion of the first cover plate is at least partially provided in the crimping 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.

[0013] 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.

[0014] 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.

[0015] In some embodiments, the protrusion of the second cover plate is at least partially located within the positive projection range of the insulating member along the first direction, and the insulating member is provided with a support portion protruding toward the second cover plate, and the insulating member abuts against the protrusion of the second cover plate through the support portion.

[0016] 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.

[0017] In a second aspect, an embodiment of the present application provides a battery, comprising the battery cell of the first aspect.

[0018] In a third aspect, an embodiment of the present application provides an electrical device, including a battery in a second direction, and the battery is used to provide electrical energy.

[0019] 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

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the structure of a battery cell in the prior art;

[0022] Figure 2 It is a partial enlarged view of the edge of the battery end cover in the prior art;

[0023] Figure 3 It is a schematic diagram of the structure of a battery cell assembled in a battery in the prior art;

[0024] Figure 4 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0025] Figure 5 is an exploded diagram of a battery provided in some embodiments of the present application;

[0026] Figure 6 is a schematic structural diagram of a battery cell at one angle provided in some embodiments of the present application;

[0027] Figure 7 is an exploded view of a battery cell provided in some embodiments of the present application;

[0028] Figure 8 is a schematic diagram of the structure of a battery cell provided in some other embodiments of the present application;

[0029] Fig. 9 is a schematic structural diagram of a battery cell from another angle provided in some embodiments of the present application;

[0030] Fig.10 yes Figure 6 Sectional view in the AA direction;

[0031] Fig.11 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0032] Fig.12 It is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application.

[0033] The reference numerals in the specific implementation manner are as follows:

[0034] 100 batteries, 200 controllers, 300 motors;

[0035] 10 battery cells; 20 pressure plates; 30 bottom plates;

[0036] 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;

[0037] X is the second direction, Z is the first direction. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used 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 orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0041] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0042] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] In the description of the embodiments of the present application, unless otherwise clearly specified and 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. Moreover, a first feature being "above", "above" or "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 higher in level than the second feature. A first feature being "below", "below" or "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 lower in level than the second feature.

[0044] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0045] See also Figures 1 to 3 , Figure 1 is a schematic diagram of the structure of a battery cell 10 in the prior art, Figure 2 It is a partial enlarged view of the edge 122 of the battery end cover 12 in the prior art. Figure 3 It is a schematic structural diagram of a battery cell 10 assembled in a 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, the above-mentioned end cap structure will form a bulge at the edge 122 of the end cap 12 after the end cap 12 is welded to the wall portion 11. When the battery cell 10 is assembled in the battery 100, the battery cell 10 will abut against the plates on both sides, namely the pressure plate 20 and the bottom plate 30 through the edge 122, thereby causing stress on the edge 122. On the one hand, the edge 122 is a welding area, namely a weak area of ​​the strength of the battery cell 10, so the stress on the edge 122 will increase the risk of damage to the battery 100. On the other hand, the contact area between the edge 122 and the plates on both sides is small, which is easy to cause stress concentration in the battery 100, affecting the reliability of the battery 100 and reducing the service life.

[0048] Based on the above considerations, in order to optimize the stress distribution in the battery 100, the applicant has designed a battery cell 10 after in-depth research, in which a protrusion 13 is provided on the end cover 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 in the battery 100, the battery cell 10 can contact the plate body of the battery 100 through the protrusion 13, reducing the bearing force at the edge 122, thereby reducing the risk of damage to the welding position, and optimizing the stress distribution of the battery 100, thereby improving the service life of the battery 100.

[0049] The technical solution described in the embodiment of the present application is applicable to the battery 100 and an electrical device using the battery 100 .

[0050] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. 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, but for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0052] See also Figure 4 , Figure 4 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0053] The vehicle is provided with a battery 100 inside, and the battery 100 can be provided at the bottom, head or tail of the vehicle. The battery 100 can be used to power the vehicle, for example, the battery 100 can be used as an operating power source for the vehicle. The vehicle can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle during driving.

[0054] See also Figure 5 , Figure 5 An exploded schematic diagram of a battery 100 provided in accordance with some embodiments of the present application.

[0055] The battery 100 mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. For example, the battery 100 mentioned in the present application may include a battery module or a battery pack. The battery 100 generally also includes a box for encapsulating one or more battery cells 10. The box can prevent liquid 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, etc. The battery cell 10 includes but is not limited to a cylinder, a flat body, a rectangular parallelepiped or other shapes, etc.

[0057] See also Figure 6 and Figure 7 , Figure 6 This is a schematic structural diagram of a battery cell 10 provided in some embodiments of the present application at an angle. Figure 7 A schematic diagram of the exploded structure of a battery cell 10 provided for some embodiments of the present application. A battery cell 10 refers to the smallest unit constituting a battery 100, and the battery cell 10 includes a housing 1, an electrode assembly 2, and other functional components. The electrode assembly 2 is a component in the battery cell 10 where an 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 and collided, so that the battery cell 10 can have a higher structural strength and the safety performance can also be improved. 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, wherein the formed internal environment can be used to accommodate the electrode assembly 2, the electrolyte and other components. The wall portion 11 and the end cap 12 can be independent components, and an opening can be set on the wall portion 11, and the internal environment of the battery cell 10 is formed by covering the opening with the end cap 12 at the opening.

[0060] According to some embodiments of the present application, see Figure 6 and Figure 7 The present application provides a battery cell 10, which includes a shell 1 and an electrode assembly 2. The shell 1 includes a wall portion 11 and an end cover 12. The wall portion 11 encloses a receiving cavity that opens in a first direction Z. The end cover 12 covers the opening. The end cover 12 includes a base 121 and an edge 122 that surrounds the outer periphery of the base 121. The edge 122 is connected to the wall portion 11 and protrudes relative to the base 121 along the first direction Z toward a side 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 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.

[0061] In the embodiment of the present application, a protrusion 13 is provided on the base 121 of the end cover 12, and a protrusion distance of the protrusion 13 relative to the base 121 is greater than or equal to a 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 to utilize the protrusion 13 to 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 protruding distance of the protrusion 13 relative to the base 121 is equal to the protruding 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 the 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 the base 121 in the first direction Z, and in the second direction X, the edge 122 and the protrusion 13 are spaced apart, and the second direction X intersects the first direction Z.

[0067] The edge 122 and the protrusion 13 are staggered with the base 121 in the first direction Z, which means that the edge 122 and the protrusion 13 are at different heights with the base 121 along the first direction Z, so that on the side surface of the end cover 12 away from the wall 11, the edge 122 and the protrusion 13 are protruded relative to the base 121, while on the side surface of the end cover 12 facing the wall 11, the base 121 is protruded relative to the edge 122 and the protrusion 13. In addition, by spacing the edge 122 and the protrusion 13 in the second direction X, the base 121 can enclose the edge 122 to form a slot on the side surface of the end cover 12 facing the wall 11, and the wall 11 cooperates with the slot, so that the end cover 12 and the wall 11 can be positioned and matched while the protrusion 13 is provided, 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 also read Figure 6 , Figure 8 and Fig. 9 , Figure 6 and Figure 8 The structure diagram of the battery cell 10 on the first cover plate 12a side in some embodiments of the present application is shown. Fig. 9 A schematic structural diagram of the battery cell 10 on the second cover plate 12b side in some embodiments of the present application is shown.

[0073] It should be noted that the wall portion 11 encloses a accommodating cavity that is open in the first direction Z, and includes a bottom wall and side walls arranged around the bottom wall, the bottom wall and the side walls enclose a 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, the side walls are used to be arranged around the electrode assembly 2 and enclose a 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 is formed with an opening only on one side along the first direction Z, the end cover 12 may only include the first cover plate 12a, and the first cover plate 12a covers the opening; or, when the accommodating cavity is formed with openings on both sides along the first direction Z, the end cover 12 includes the first cover plate 12a and the 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.

[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 crimped with the first cover plate 12a, and the bottom plate 30 is crimped with 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] See also Figure 6 and Figure 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, etc., which can ensure that when the pressure in the accommodation chamber is too high, the pressure can be exhausted and relieved through the pressure relief mechanism 121a.

[0080] When the first cover plate 12a is also provided with functional components such as a pressure relief mechanism 121a, the protrusion 13 can also be provided on the peripheral side of the pressure relief mechanism 121a, so as to optimize 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] See also Figures 9 to 11 , Fig.11 A partial cross-sectional view of a battery cell 10 provided in some embodiments of the present application is shown. 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 disposed 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 be partially and entirely arranged to form a plate structure, and the protrusion 13 can 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 member 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 substrate 121 is large, so the insulating part 3 can be directly set on the substrate 121 to support the insulating part 3 through the substrate 121.

[0085] See also Fig.12 , Fig.12 A partial cross-sectional view of a battery cell 10 provided in some other embodiments of the present application is shown.

[0086] In other embodiments, when the area of ​​the protrusion 13 is larger, for example, when the protrusion 13 is partially provided on the entire surface, the area of ​​the base 121 is smaller. 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 be abutted 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 may match the protrusion 13, that is, the orthographic 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 this application, please refer to Figures 4 to 12 The present application provides a battery cell 10, wherein the wall portion 11 includes a plurality of side walls, the side walls 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, the first cover plate 12a and the second cover plate 12b are respectively provided to cover the openings on both sides. For the first cover plate 12a and the second cover plate 12b, a protrusion 13 is provided thereon, please refer to Fig.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 formed by integrally stamping the base 121, and in the first direction Z, the protrusion distance L1 of the protrusion 13 relative to the base 121 is equal to the protrusion distance L2 of the edge 122 relative to the base 121, so that 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, and by simultaneously utilizing the protrusion 13 and the edge 122 to bear the 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 schemes.

[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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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, characterized in that: include: A housing, comprising a wall portion and an end cover, wherein the wall portion encloses a receiving cavity opening in a first direction, the end cover is disposed on the opening, the end cover comprises a base body and an edge surrounding the outer periphery of the base body, the edge is connected to the wall portion and is disposed protruding relative to the base body toward a side away from the wall portion along the first direction; An electrode assembly, disposed in the accommodating cavity; Wherein, a protrusion is arranged on the base, and the protrusion is arranged 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, characterized in that: 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 the second direction, and the second direction intersects with the first direction.

3. The battery cell according to claim 2, characterized in that: The protrusion and the base are configured as an integral structure.

4. The battery cell according to claim 2, characterized in that: 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, characterized in that: An orthographic projection area of ​​the protrusion along the first direction is greater than or equal to half of an orthographic projection area of ​​the edge along the first direction.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The accommodating cavity is formed with the opening on one side in the first direction, and the end cover comprises a first cover plate, and the first cover plate is covered on 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, characterized in that: The first cover plate is provided with a pressing area for supporting a pressing plate, and the protrusion of the first cover plate is at least partially provided in the pressing area.

8. The battery cell according to claim 6, characterized in that: 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, characterized in that: The battery cell further includes an insulating member, which is disposed in the accommodating cavity, and the electrode assembly is supported on the second cover plate through the insulating member.

10. The battery cell according to claim 9, characterized in that: The protrusion of the second cover plate is at least partially located within the orthographic projection range of the insulating member along the first direction within the second cover plate; The insulating member is provided with a support portion protruding toward the second cover plate, and the insulating member abuts against the protruding portion of the second cover plate through the support portion.

11. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 10.

12. An electrical device, characterized in that: Comprising the battery of claim 11, the battery is used to provide electrical energy.

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