Battery monomer, battery and electric device

Abstract

The utility model provides a single battery, a battery and a power utilization device, the single battery comprises a shell, an electrode assembly and an end cover assembly, the shell comprises a shell body and a reinforcing part, the shell body is provided with an open accommodating cavity, the reinforcing part is arranged on the surface, facing the accommodating cavity, of the shell body, the electrode assembly is arranged in the accommodating cavity, and the end cover assembly is arranged on the surface, facing the accommodating cavity, of the shell body. A gap is formed between the electrode assembly and at least part of the shell body, the reinforcing part is located in the gap, and the end cover assembly is arranged at the opening of the shell and electrically connected with the electrode assembly. According to the battery monomer provided by the embodiment of the invention, the internal space of the battery monomer can be reasonably utilized, and the strength of the shell is enhanced while the volume of the battery monomer is not increased.

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] During the charge and discharge process of the battery, the battery will expand and deform cyclically, pulling the welding area, so the strength of the shell needs to be enhanced. Existing batteries will have reinforcing ribs on the shell, but the setting of the reinforcing ribs will occupy the internal space of the battery cell, which requires increasing the volume of the battery cell and reducing the battery energy density. 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 reasonably utilize the internal space of the battery cell and enhance the strength of the shell without increasing the volume of the battery.

[0005] In the first aspect, the present application provides a battery cell, including a shell, an electrode assembly and an end cap assembly, the shell including a shell body and a reinforcement portion, the shell body having an open accommodating cavity, the reinforcement portion being arranged on the surface of the shell body facing the accommodating cavity, the electrode assembly being arranged in the accommodating cavity, a gap being formed between the electrode assembly and at least part of the shell body, the reinforcement portion being located in the gap, and the end cap assembly being arranged at the opening of the shell and electrically connected to the electrode assembly.

[0006] In the embodiment of the present application, by arranging the reinforcing portion on the inner surface of the shell and being located in the matching gap between the electrode assembly and the shell, the internal space of the battery cell can be more reasonably utilized, and the strength of the shell can be enhanced without increasing the volume of the battery cell.

[0007] In some embodiments, the shell body has a bottom wall and a side wall, the bottom wall and the end cover assembly are arranged on both sides of the side wall in the height direction, the surface of the electrode assembly facing the side wall is at least partially an arc-shaped surface, the gap is located between the arc-shaped surface and the side wall, and the side wall is provided with a reinforcement portion.

[0008] In an embodiment of the present application, the electrode assembly can be configured as a winding structure. After the electrode assembly is disposed in the accommodating cavity, a gap is formed between the curved surface of the electrode assembly and the side wall. Therefore, by utilizing the gap formed between the curved surface and the side wall, it is possible to more conveniently set the reinforcing portion on the side wall, thereby enhancing the structural strength of the side wall of the shell, so as to better withstand the expansion force of the electrode assembly and reduce deformation of the shell during the use of the battery.

[0009] In some embodiments, the reinforcing portion and the curved surface are both extended along the height direction to facilitate installation of the electrode assembly in the accommodating cavity along the height direction, thereby reducing the difficulty of installation and also reducing the possibility of scratches between the electrode assembly and the reinforcing portion during installation, thereby improving the reliability of the battery cell.

[0010] In some embodiments, the arc surface has a top and arc segments on both sides of the top along the first direction. The top is protruded toward the side wall, and gaps are formed with the side walls through the arc segments on both sides. The first direction intersects with the height direction. Specifically, according to actual needs, the reinforcement part can be arranged in at least one gap to improve the strength of the shell.

[0011] In some embodiments, the number of electrode assemblies is more than two, and the more than two electrode assemblies are arranged along a first direction. The arc segments of two adjacent electrode assemblies and the side walls together enclose a gap, and the reinforcement portion is arranged between the arc segments of two adjacent electrode assemblies at least along the first direction, thereby increasing the size of the reinforcement portion along the first direction, making it easier to set the reinforcement portion, and also increasing the structural strength of the shell and improving the reliability of the battery cell.

[0012] In some embodiments, the number of reinforcement parts is more than two, and the more than two reinforcement parts are arranged at intervals along the first direction in at least part of the gap, which can reinforce the shell at multiple positions, further improve the structural strength of the shell, and reduce deformation of the shell during use.

[0013] In some embodiments, the side walls include a first wall arranged opposite to each other along a first direction and a second wall arranged opposite to each other along a second direction; the surfaces of the electrode assembly facing the second wall are all arc-shaped surfaces, and the reinforcing parts are arranged on the second walls on both sides. The second direction intersects with the first direction, so that the second walls of the shell are reinforced by the reinforcing parts to better withstand the expansion force during the use of the battery and reduce the deformation of the shell.

[0014] In some embodiments, one end of the reinforcement portion along the height direction is connected to the bottom wall, and the other end is spaced apart from the opening. Along the height direction, the distance between the reinforcement portion and the opening is greater than or equal to the thickness of the end cover assembly, thereby leaving space for connecting the shell and the end cover assembly, making it easier to connect the end cover assembly to the shell.

[0015] In some embodiments, the reinforcement portion includes a main section and a transition section. The main section is connected to the bottom wall through the transition section. The cross-sectional area of ​​the transition section in the height direction gradually increases in the direction away from the main section, which can make it easier for the shell to be integrally formed by stretching, and can play a certain guiding role when assembling the electrode assembly, making it easier to process and install.

[0016] In some embodiments, the battery cell also includes an insulating film, which is arranged around the periphery of the electrode assembly and is adapted to the shell. The electrode assembly is connected to the shell through the insulating film, so that the insulating film seals and protects the electrode assembly, thereby reducing the risk of internal short circuit in 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, comprising the battery of the second aspect, and the battery is used to provide electrical energy.

[0019] According to the battery cell of the embodiment of the present application, by setting a reinforcement part on the shell body, the strength of the shell can be improved, the pressure resistance of the shell can be improved, and the deformation of the shell during the use of the battery can be reduced. In addition, since a gap is formed between the electrode assembly and at least part of the shell body when the electrode assembly is set in the accommodating cavity of the shell, by setting the reinforcement part in the gap, the internal space of the battery cell can be more reasonably utilized, and the utilization rate of the internal space of the battery cell can be improved, thereby strengthening the shell strength and improving the reliability of the battery cell without increasing the volume of the battery cell.

[0020] 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

[0021] 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:

[0022] Figure 1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0023] Figure 2 is an exploded diagram of a battery provided in some embodiments of the present application;

[0024] Figure 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0025] Figure 4 is an exploded view of a battery cell provided in some embodiments of the present application;

[0026] Figure 5 is a schematic diagram of the structure of a housing provided in some embodiments of the present application;

[0027] Figure 6 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0028] Figure 7 yes Figure 6 The enlarged view of point A in the middle;

[0029] Figure 8 is a cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0030] Fig. 9 yes Figure 8 The enlarged view of point B in the middle;

[0031] Fig.10 is a cross-sectional view of a housing in some embodiments of the present application;

[0032] Fig.11 yes Fig.10 Cross-section along EE direction;

[0033] Fig.12 yes Fig.11 Enlarged view of point C in the middle.

[0034] The reference numerals in the specific implementation manner are as follows:

[0035] 100 batteries, 200 controllers, 300 motors;

[0036] 10 battery cells, 20 battery boxes;

[0037] 1 shell, 11 shell body, 111 bottom wall, 112 side wall, 1121 first wall, 1122 second wall, 12 reinforcement part, 121 main body section, 122 transition section, 12a first reinforcement part, 12b second reinforcement part, 2 electrode assembly, 21 arc surface, 211 top, 212 arc segment, 22 plane, 3 end cover assembly, 4 insulation film;

[0038] X is the second direction, Y is the first direction, and Z is the height direction. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] As the energy density of batteries becomes higher and higher, during the use of batteries, as the batteries are charged and discharged, they will undergo cyclic expansion, and the force exerted by the electrode assembly on the shell will become greater and greater. The shell is easily deformed under the force and pulls the welding area between the shell and the end cover assembly, causing cracks in the welding area, affecting the reliability of the battery cell.

[0047] In existing battery cells, the strength of the shell is enhanced by setting reinforcing ribs. The reinforcing ribs have two layout forms, one is set on the outer surface of the shell, and the other is set on the inner surface of the shell. However, the arrangement form of setting the reinforcing ribs on the outer surface of the shell will affect the arrangement of the battery cells, while the arrangement form of setting the reinforcing ribs on the inner surface of the shell will increase the volume of the battery cells and reduce the battery energy density.

[0048] Based on the above considerations, in order to solve the above technical problems, an embodiment of the present application provides a battery cell, in which reinforcing ribs are arranged on the inner surface of the shell and are located in the matching gap between the electrode assembly and the shell, so that the internal space of the battery cell can be more reasonably utilized, and the strength of the shell can be enhanced without increasing the volume of the battery.

[0049] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[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 batteries and using batteries, but for the sake of simplicity of description, the following embodiments are described using electric vehicles as examples.

[0052] See also Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0053] The interior of the vehicle is provided with a battery 100, which can be arranged at the bottom, head or tail of the vehicle. The battery 100 can be used for power supply of the vehicle. For example, the battery 100 can be used as the operating power source of the vehicle. The vehicle may 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-up, navigation and driving of the vehicle.

[0054] Please refer to Figure 2 , Figure 2 which is an exploded view of the battery 100 provided by 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. The battery cell 10 refers to the smallest unit that makes up the battery 100. The battery 100 generally further includes a battery box 20 for encapsulating one or more battery cells 10. The battery box 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 10.

[0056] Multiple battery cells 10 can be connected in series, parallel or in a hybrid connection through connectors. A hybrid connection means that there are both series and parallel connections among multiple battery cells 10. Multiple battery cells 10 can be directly connected in series, parallel or in a hybrid connection together, and then the whole formed by multiple battery cells 10 is accommodated in the battery box 202. Of course, it can also be that multiple battery cells 10 are first connected in series, parallel or in a hybrid connection to form a battery 100 in the form of a battery module, and then multiple battery modules are connected in series, parallel or in a hybrid connection through connectors to form a whole and are accommodated in the battery box 202.

[0057] Optionally, the battery cell 10 can be a secondary battery or a primary battery. A secondary battery refers to a battery cell that can be activated by charging after discharging to continue use. The battery cell 10 includes but is not limited to lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium-metal battery cells, sodium-metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-metal hydride battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0058] As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell or a battery cell of other shapes, but is not limited thereto. Prismatic battery cells include square shell battery cells, blade-shaped battery cells, multi-prismatic batteries, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc.

[0059] Please refer to Figures 3 to 7The embodiment of the present application provides a battery cell 10, including a shell 1, an electrode assembly 2 and an end cap assembly 3. The shell 1 includes a shell body 11 and a reinforcement portion 12, the shell body 11 has a receiving cavity opened in a first direction Y, the reinforcement portion 12 is arranged on the surface of the shell body 11 facing the receiving cavity, the electrode assembly 2 is arranged in the receiving cavity, a gap is formed between the electrode assembly 2 and at least a part of the shell body 11, the reinforcement portion 12 is located in the gap, and the end cap assembly 3 is arranged at the opening of the shell 1 and is electrically connected to the electrode assembly 2.

[0060] The battery cell 10 provided in the embodiment of the present application can improve the strength of the shell 1, improve the pressure resistance of the shell 1, and reduce the deformation of the shell 1 during the use of the battery 100 by arranging the reinforcement part 12 on the shell body 11. In addition, since a gap is formed between the electrode assembly 2 and at least a part of the shell body 11 when the electrode assembly 2 is arranged in the accommodating cavity of the shell 1, the internal space of the battery cell 10 can be more reasonably utilized by arranging the reinforcement part 12 in the gap, and the utilization rate of the internal space of the battery cell 10 can be improved, thereby strengthening the strength of the shell 1 and improving the reliability of the battery cell 10 without increasing the volume of the battery cell 10.

[0061] In the embodiment of the present application, the electrode assembly 2 is a component in the battery cell 10 where an electrochemical reaction occurs, and the housing 1 may contain one or more electrode assemblies 2. The electrode assembly 2 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The electrode assembly 2 can be of various shapes and sizes, such as cylindrical, flat, or multi-prism.

[0062] The shell 1 is used to form an internal environment of the battery cell 10, and the formed internal environment can be used to accommodate the electrode assembly 2, the electrolyte and other components. The shell 1 can be in various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a polygonal prism shape, etc. Specifically, the shape of the shell 1 can be determined according to the specific shape and size of the electrode assembly 2.

[0063] The shell 1 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., so that the shell 1 itself has a certain strength to improve the pressure resistance of the shell 1 and reduce the deformation of the shell 1 during use.

[0064] The end cap assembly 3 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 assembly 3 can be adapted to the shape of the shell 1 to match the shell 1. Optionally, the end cap assembly 3 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap assembly 3 is not easily deformed when squeezed and collided, so that the battery cell 10 can have a higher structural strength and reliability can also be improved.

[0065] Functional components such as electrode terminals may be provided on the end cap assembly 3. The electrode terminal may be used to electrically connect to the electrode assembly 2 for outputting or inputting electrical energy of the battery cell 10. In some embodiments, the end cap assembly 3 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value. The material of the end cap assembly 3 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating member may also be provided on the inner side of the end cap assembly 3, and the insulating member may be used to isolate the electrical connection components in the housing 1 from the end cap assembly 3 to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber, etc.

[0066] In some optional embodiments, the battery cell 10 further includes an insulating film 4 , which is disposed around the outer periphery of the electrode assembly 2 and is adapted to the shell 1 , and the electrode assembly 2 is connected to the shell 1 through the insulating film 4 .

[0067] The insulating film 4 is coated on the outside of the electrode assembly 2 . The insulating film 4 seals and protects the electrode assembly 2 , and can effectively insulate the electrode assembly 2 and the shell 1 from each other, thereby reducing the risk of internal short circuit in the battery cell 10 .

[0068] The insulating film 4 is adapted to the shell 1, which means that the insulating film 4 can be set as a soft film. When the electrode assembly 2 is set in the accommodating cavity, the insulating film 4 can be deformed and cooperate with the reinforcing part 12 to achieve the assembly requirements of the electrode assembly 2 in the battery cell 10. Optionally, the insulating film 4 can be a Mylar film.

[0069] The energy density of a battery cell 10 refers to the electrical energy released by the battery cell 10 per unit mass or unit volume, and is affected by many factors, including the electrochemical composition, the size of the electrode assembly 2, the electrode material, etc. In actual applications, the greater the energy density of the battery cell 10, the more electrical energy is stored per unit volume in the battery cell 10, and the longer the battery life of the battery 100.

[0070] The battery cell 10 in the embodiment of the present application is provided with a reinforcing portion 12 by utilizing the fitting gap formed between the electrode assembly 2 and the shell body 11. The provision of the reinforcing portion 12 does not affect the electrode assembly 2, thereby being able to meet the energy density requirements of the battery cell 10 without increasing the volume of the battery 100, thereby improving the overall performance of the battery cell 10.

[0071] See also Figures 5 to 7In some optional embodiments, the shell body 11 has a bottom wall 111 and a side wall 112, the bottom wall 111 and the end cover assembly 3 are arranged on both sides of the side wall 112 in the height direction Z, the surface of the electrode assembly 2 facing the side wall 112 is at least partially an arc-shaped surface 21, the gap is located between the arc-shaped surface 21 and the side wall 112, and the side wall 112 is provided with a reinforcement portion 12.

[0072] For the wound electrode assembly 2, since at least part of its surface along the winding direction is wound to form an arcuate surface 21, after the electrode assembly 2 is arranged in the accommodating cavity, a gap is formed between the arcuate surface 21 of the electrode assembly 2 and the side wall 112. By utilizing the gap formed between the arcuate surface 21 and the side wall 112, it is easier to arrange the reinforcing portion 12 on the side wall 112, thereby enhancing the structural strength of the side wall 112 of the shell 1, so as to better withstand the force of the expansion of the electrode assembly 2 during the use of the battery 100 and reduce the deformation of the shell 1.

[0073] Furthermore, since the gap space formed by the arc surface 21 and the side wall 112 is relatively large, by setting the reinforcing portion 12 between the arc surface 21 and the side wall 112, it is also possible to facilitate the setting of the reinforcing portion 12, and the thickness of the reinforcing portion 12 can also be appropriately increased to further improve the structural strength of the shell 1.

[0074] Optionally, the protrusion distance of the reinforcing portion 12 relative to the shell 1 toward the accommodating cavity is greater than or equal to 0.2 mm, that is, the thickness of the reinforcing portion 12 is greater than or equal to 0.2 mm, so that the structural strength of the shell 1 can meet the pressure resistance requirement of the battery 100 during use.

[0075] In some optional embodiments, the reinforcing portion 12 and the curved surface 21 are both extended along the height direction Z to facilitate installation of the electrode assembly 2 in the accommodating cavity along the height direction Z, thereby reducing the difficulty of installation and also reducing the possibility of scratches between the electrode assembly 2 and the reinforcing portion 12 during installation, thereby improving the reliability of the battery cell 10.

[0076] Optionally, the reinforcing portion 12 and the shell body 11 can be set as an integral structure. For example, the shell 1 can be formed by stretching. Specifically, a pressing plate device can be used to use the impact force of the punch to pull part or all of the flat plate into the concave mold cavity along the height direction Z to form a shell 1 with an opening, wherein the reinforcing portion 12 can be formed on the side wall 112 by adjusting the structure of the punch. The above-mentioned molding method can make it easier for the shell 1 to be integrally molded during the stretching process, thereby improving the processing efficiency of the shell 1.

[0077] It is understandable that when the shell 1 is formed by stretching, the protrusion distance of the reinforcement portion 12 relative to the shell 1 toward the accommodating cavity is less than or equal to the difference between the thickness of the bottom wall 111 and the thickness of the shell body 11 to meet the forming requirements of the shell 1.

[0078] In some embodiments, the cross-section of the reinforcement portion 12 along the height direction Z can be set to at least one of a rectangle, a trapezoid, and a semicircle to simplify the structure of the reinforcement portion 12 and facilitate processing and forming.

[0079] See also Figure 6 and Figure 7 In some optional embodiments, the arc surface 21 has a top 211 and arc segments 212 located on both sides of the top 211 along the first direction Y. The top 211 is protruded toward the side wall 112, and gaps are formed with the side wall 112 through the arc segments 212 on both sides. The first direction Y intersects with the height direction Z.

[0080] The arc surface 21 may specifically include a top 211 and arc segments 212 located on both sides of the top 211. The top 211 refers to the most protruding position of the arc surface 21. When the electrode assembly 2 is disposed in the accommodating cavity, the top 211 can be used to limit the position, and a gap can be formed between the arc segment 212 and the side wall 112. Since the arc segments 212 are respectively disposed on both sides of the top 211 along the first direction Y, the reinforcing portion 12 can be disposed in at least one gap according to actual needs to improve the strength of the housing 1.

[0081] Optionally, the size of the reinforcing portion 12 along the first direction Y is smaller than the size of the gap along the first direction Y. By controlling the size of the reinforcing portion 12, the risk of scratches between the electrode assembly 2 and the reinforcing portion 12 can be reduced, thereby improving the reliability of the reinforcing portion 12.

[0082] Optionally, the dimension of the reinforcement part 12 along the first direction Y is 2 mm to 10 mm. By making the dimension of the reinforcement part 12 along the first direction Y greater than or equal to 2 mm, it can better play a reinforcing role, so that the strength of the housing 1 can meet the recycling requirements of the battery 100. In addition, by making the dimension of the reinforcement along the first direction Y less than or equal to 10 mm, it can reduce interference with the electrode assembly 2, reduce the risk of scratches, and improve the reliability of the electrode assembly 2.

[0083] In some optional embodiments, the number of electrode assemblies 2 is more than two, and the more than two electrode assemblies 2 are arranged along the first direction Y. The arc segments 212 of two adjacent electrode assemblies 2 and the side walls 112 together enclose a gap, and the reinforcement portion 12 is arranged at least along the first direction Y between the arc segments 212 of two adjacent electrode assemblies 2.

[0084] For ease of description, the gap formed by a single arc segment 212 and the side wall 112 is defined as a first gap, and the gap formed by the arc segments 212 and the side wall 112 of two adjacent electrode assemblies 2 is defined as a second gap.

[0085] Since the second gap is formed by the arc segment 212 of two adjacent electrode assemblies 2 and the side wall 112, the size of the second gap along the first direction Y is larger than the size of the first gap along the first direction Y. Therefore, by setting the reinforcement part 12 at least in the second gap, the size of the reinforcement part 12 along the first direction Y can be increased, which is more convenient for the setting of the reinforcement part 12. At the same time, it is also possible to increase the structural strength of the shell 1 and improve the reliability of the battery cell 10.

[0086] It can be understood that the reinforcing portion 12 is arranged between the arc segments 212 of two adjacent electrode assemblies 2 at least along the first direction Y, which means that the number of the reinforcing portion 12 is one and the reinforcing portion 12 is arranged in the second gap along the first direction Y, or the number of the reinforcing portion 12 is more than two, and at least one reinforcing portion 12 is arranged in the second gap.

[0087] See also Figure 8 and Fig. 9 In some optional embodiments, the number of the reinforcing parts 12 is more than two, and the more than two reinforcing parts 12 are arranged at intervals along the first direction Y in at least part of the gap.

[0088] Taking two electrode assemblies 2 as an example, at this time, there are two first gaps between the electrode assembly 2 and the shell body 11 and a second gap located between the two first gaps, so three reinforcement parts 12 can be correspondingly arranged and respectively arranged in the first gap and the second gap, so that the shell 1 can be reinforced at multiple positions, further improving the structural strength of the shell 1 and reducing the deformation of the shell 1 during use.

[0089] Optionally, the reinforcing portion 12 arranged in the first gap is defined as a first reinforcing portion 12a, and the reinforcing portion 12 arranged in the second gap is defined as a second reinforcing portion 12b. When the first reinforcing portion 12a and the second reinforcing portion 12b are provided at the same time, the sizes of the first reinforcing portion 12a and the second reinforcing portion 12b along the first direction Y may be equal or unequal, as long as the strength requirements of the shell 1 are met.

[0090] See also Figures 6 to 9 In some optional embodiments, the side wall 112 includes a first wall 1121 relatively arranged along the first direction Y and a second wall 1122 relatively arranged along the second direction X, the surface of the electrode assembly 2 facing the second wall 1122 is a curved surface 21, the reinforcement portion 12 is arranged on the second wall 1122 on both sides, and the second direction X intersects with the first direction Y.

[0091] Optionally, the first direction Y is a width direction, and the second direction X is a length direction.

[0092] Taking the flat electrode assembly 2 as an example, the shell 1 can be set as a rectangular structure corresponding to the electrode assembly 2. Both sides of the electrode assembly 2 along the second direction X are arc-shaped surfaces 21. Therefore, a reinforcing portion 12 can be set on the second wall 1122 of the shell 1 to strengthen the second wall 1122 of the shell 1 through the reinforcing portion 12, so as to better withstand the expansion force of the battery 100 during use and reduce the deformation of the shell 1.

[0093] Optionally, the reinforcing portions 12 on the second wall 1122 are symmetrically arranged relative to the electrode assembly 2 along the second direction X, that is, the number of the reinforcing portions 12 on the second walls 1122 on both sides is one and is arranged at the second gap, or, the number of the reinforcing portions 12 on the second walls 1122 on both sides is three and is respectively arranged in the first gap and the second gap, so that the two sides of the shell 1 are evenly stressed, thereby improving the overall life of the battery cell 10.

[0094] In some optional embodiments, the surface of the electrode assembly 2 facing the first wall 1121 is a plane 22 , and the area of ​​the first wall 1121 is greater than the area of ​​the second wall 1122 .

[0095] By making the surface of the electrode assembly 2 facing the first wall 1121 a plane 22, it is possible to more conveniently match the electrode assembly 2 with the first wall 1121 of the shell 1, as well as to facilitate the arrangement of multiple electrode assemblies 2. Since the area of ​​the first wall 1121 is larger than the area of ​​the second wall 1122, a gap can be formed for the setting of the reinforcement portion 12 while increasing the energy density of the battery cell 10, thereby enabling the battery 100 to have better performance.

[0096] See also Figures 3 to 10 , Fig.10 It is a cross-sectional view of the housing 1 in some embodiments of the present application.

[0097] In some optional embodiments, one end of the reinforcing portion 12 along the height direction Z is connected to the bottom wall 111 , and the other end is spaced apart from the opening. Along the height direction Z, the distance between the reinforcing portion 12 and the opening is greater than or equal to the thickness of the end cover assembly 3 .

[0098] By making the reinforcing portion 12 have a preset distance L with the opening along the height direction Z, and making the preset distance L greater than the thickness of the end cover assembly 3, it is possible to increase the strength of the shell 1 while leaving space for connecting the shell 1 and the end cover assembly 3, making it easier to connect the end cover assembly 3 to the shell 1.

[0099] See also Fig.11 and Fig.12 , Fig.11 for Fig.10Cross-section along the EE direction, Fig.12 for Fig.11 Enlarged view of point C in the middle. In some optional embodiments, the reinforcing portion 12 includes a main section 121 and a transition section 122, the main section 121 is connected to the bottom wall 111 through the transition section 122, and the cross-sectional area of ​​the transition section 122 in the height direction Z gradually increases in a direction away from the main section 121.

[0100] By making the reinforcement portion 12 include the main section 121 and the transition section 122, it is easier to form the housing 1 in one piece by stretching, and it can play a certain role in guiding when assembling the electrode assembly 2, making it easier to process and install. Optionally, in the direction away from the main section 121, the size of the transition section 122 along the first direction Y gradually increases to achieve a transition in the cross-sectional area of ​​the transition section 122.

[0101] The structure of the battery cell 10 in the embodiment of the present application is described below by taking a battery cell 10 in a specific embodiment as an example.

[0102] The battery cell 10 includes a shell 1 , an electrode assembly 2 and an end cap assembly 3 . The shell 1 has an open accommodating cavity, the electrode assembly 2 is disposed in the accommodating cavity, and the end cap assembly 3 is disposed at the opening of the shell 1 and electrically connected to the electrode assembly 2 .

[0103] Among them, the shell 1 is formed by integral stretching to form a shell body 11 and a reinforcing portion 12 arranged on the surface of the shell body 11 facing the accommodating cavity. The number of electrode assemblies 2 is two and they are arranged in the accommodating cavity along the first direction Y. The electrode assembly 2 has an arcuate surface 21 arranged toward the side wall 112 of the shell 1. A plurality of gaps are formed between the arcuate surface 21 and the side wall 112. The reinforcing portion 12 is arranged in the gap formed by the arcuate surface 21 and the side wall 112 of two adjacent electrode assemblies 2, so that the internal space of the battery cell 10 can be more reasonably utilized. Without increasing the volume of the battery cell 10, the strength of the shell 1 is strengthened, thereby improving the reliability of the battery cell 10.

[0104] The battery 100 and the electrical device in the embodiment of the present application, since they both include the battery cell 10 in the above embodiment, have the advantages of high pressure resistance, small deformation, long service life, etc., and are easy to promote and apply.

[0105] 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: The shell comprises a shell body and a reinforcement part, wherein the shell body has an open accommodating cavity, and the reinforcement part is arranged on a surface of the shell body facing the accommodating cavity; an electrode assembly, disposed in the accommodating cavity, wherein a gap is formed between the electrode assembly and at least a portion of the shell body, and the reinforcing portion is located in the gap; An end cap assembly is disposed at the opening of the shell and is electrically connected to the electrode assembly.

2. The battery cell according to claim 1, characterized in that: The shell body has a bottom wall and a side wall, and the bottom wall and the end cover assembly are arranged opposite to each other on both sides of the side wall in the height direction; At least a part of the surface of the electrode assembly facing the side wall is an arc-shaped surface, the gap is located between the arc-shaped surface and the side wall, and the side wall is provided with the reinforcement portion.

3. The battery cell according to claim 2, characterized in that: The reinforcing portion and the arc-shaped surface are both extended along the height direction.

4. The battery cell according to claim 2, characterized in that: The arc surface has a top and arc segments on both sides of the top along a first direction, the top is protruding toward the side wall, and the gaps are formed by the arc segments on both sides and the side wall respectively, and the first direction intersects with the height direction.

5. The battery cell according to claim 4, characterized in that: The number of the electrode assemblies is more than two, and the more than two electrode assemblies are arranged along the first direction. The arc segments of two adjacent electrode assemblies and the side walls jointly enclose the gap, and the reinforcement portion is arranged between the arc segments of two adjacent electrode assemblies at least along the first direction.

6. The battery cell according to claim 4, characterized in that: The number of the reinforcing parts is more than two, and the more than two reinforcing parts are arranged at intervals in at least a portion of the gap along the first direction.

7. The battery cell according to any one of claims 4 to 6, characterized in that: The side walls include first walls arranged opposite to each other along the first direction and second walls arranged opposite to each other along the second direction; The surfaces of the electrode assembly facing the second wall are all arc-shaped surfaces, the reinforcement parts are arranged on the second walls on both sides, and the second direction intersects with the first direction.

8. The battery cell according to any one of claims 3 to 6, characterized in that: One end of the reinforcing portion along the height direction is connected to the bottom wall, and the other end is spaced apart from the opening. Along the height direction, the distance between the reinforcing portion and the opening is greater than or equal to the thickness of the end cover assembly.

9. The battery cell according to claim 8, characterized in that: The reinforcement portion includes a main body section and a transition section, the main body section is connected to the bottom wall through the transition section, and the cross-sectional area of ​​the transition section in the height direction gradually increases in a direction away from the main body section.

10. The battery cell according to any one of claims 1 to 6, characterized in that: The battery cell further includes an insulating film, which is disposed around the outer periphery of the electrode assembly and is adapted to the shell, and the electrode assembly is connected to the shell through the insulating film.

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: The battery according to claim 11 is used for providing electrical energy.

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