Shell assembly of battery monomer, battery monomer, battery and electric device

Abstract

The utility model discloses a shell assembly of a battery monomer, the battery monomer, a battery and an electric device, and belongs to the technical field of battery monomers. The shell assembly of the battery monomer comprises a shell body and a shell cover, wherein the shell body is provided with an opening, the shell cover is arranged at the opening, and the matched surface between the shell cover and the shell body is provided with a rough area.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a housing assembly of a battery cell, a battery cell, a battery, and an electrical device. Background Art

[0002] In recent years, new energy vehicles have witnessed a leapfrog development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. A battery consists of a box body and a plurality of batteries accommodated in the box body. Among them, as a core component of new energy vehicles, the battery has high requirements both in terms of safety and service life. However, the housing of the battery cell in the battery has weak pressure resistance, and a large amount of heat will be generated during continuous charging and discharging. The battery cell expands due to heat, resulting in damage to the housing, which seriously affects the performance and service life of the battery. Summary of the Utility Model

[0003] The embodiments of the present application provide a housing assembly of a battery cell, a battery cell, a battery, and an electrical device, which can effectively improve the pressure resistance and airtightness of the housing assembly.

[0004] In a first aspect, the embodiments of the present application provide a housing assembly of a battery cell, including a housing body and a housing cover. The housing body has an open end; the housing cover is disposed at the open end, and a rough area is provided on the mating surfaces between the housing cover and the housing body.

[0005] In the above technical solution, by providing a rough area on the mating surfaces between the housing cover and the housing body, the friction between the housing cover and the housing body can be increased. When the internal pressure of the housing assembly increases, the friction can be used to inhibit the deformation and slippage of the housing cover, improving the mating reliability between the housing cover and the housing body, thereby increasing the pressure resistance of the housing assembly and effectively improving the airtightness of the housing assembly. Moreover, it is beneficial to eliminate the relatively thick sealing structure for improving airtightness and pressure resistance, thus saving space and increasing the energy density of the battery cell.

[0006] In some embodiments, the rough area includes a first area provided on the housing body, and the roughness of the first area is greater than that of the other areas on the housing body except the first area.

[0007] In the above technical solution, the roughness of the first area is greater than that of the other areas on the housing body except the first area. By increasing the roughness of a local area of the housing body, the mating reliability between the housing body and the housing cover can be increased.

[0008] In some embodiments, a seal is provided between the housing cover and the housing body, and the first area is located on the side of the housing body facing the seal.

[0009] In the above technical solution, a seal is provided between the shell cover and the shell body. The first region is located at the position of the shell body facing the seal, which can increase the friction between the shell body and the seal, making it difficult for the shell body and the seal to slide, and enhancing the sealing performance of the shell assembly.

[0010] In some embodiments, the rough region includes a second region provided on the shell cover, and the roughness of the second region is greater than that of the other regions on the shell cover except the second region.

[0011] In the above technical solution, the roughness of the second region on the shell cover is greater than that of the other regions on the shell cover except the second region. By increasing the roughness of a local part of the shell cover, the mating reliability between the shell cover and the shell body can be increased.

[0012] In some embodiments, a seal is provided between the shell cover and the shell body, and the second region is located at the position of the shell cover facing the seal.

[0013] In the above technical solution, by providing a seal between the shell cover and the shell body and the second region being located at the position of the shell cover facing the seal, the friction between the shell cover and the seal can be increased, making it difficult for the shell cover and the seal to slide, and enhancing the sealing performance of the shell assembly.

[0014] In some embodiments, the shell body includes a peripheral wall portion and an end wall portion. The end wall portion is connected to the axial end of the peripheral wall portion, and the end wall portion abuts against the axial outer side of the outer edge portion of the shell cover. The rough region is located between the end wall portion and the outer edge portion.

[0015] In the above technical solution, the end wall portion of the shell body abuts against the axial outer side of the outer edge portion of the shell cover, and the rough region is located between the end wall portion and the outer edge portion, which can increase the friction between the end wall portion and the outer edge portion, inhibit sliding between the end wall portion and the outer edge portion, thereby increasing the pressure resistance of the shell assembly, and at the same time making the installation between the shell body and the shell cover simpler and more reliable.

[0016] In some embodiments, the rough region includes a first region located on the inner surface of the end wall portion and / or a second region located on the outer surface of the outer edge portion.

[0017] In the above technical solution, whether the rough region includes a first region located on the inner surface of the end wall portion or a second region located on the outer surface of the outer edge portion, it can increase the friction between the end wall portion and the outer edge portion, inhibit sliding between the end wall portion and the outer edge portion, thereby increasing the pressure resistance of the shell assembly. When the rough region includes a first region located on the inner surface of the end wall portion and a second region located on the outer surface of the outer edge portion, roughening both the end wall portion and the outer edge portion has a better effect of increasing friction than roughening only one of them, and can better increase the pressure resistance of the shell assembly.

[0018] In some embodiments, a seal is provided between the end wall portion and the outer edge portion.

[0019] In the above technical solution, a seal is provided between the end wall portion and the outer edge portion, which can increase the friction force between the end wall portion and the seal or between the outer edge portion and the seal, or increase the friction force between the end wall portion, the outer edge portion and the seal at the same time, enhancing the sealing effect of the housing assembly.

[0020] In some embodiments, the housing cover further includes a protruding portion, the outer edge portion is disposed around the protruding portion, and the protruding portion protrudes outward relative to the outer edge portion and extends into the inner ring region of the end wall portion.

[0021] In the above technical solution, the housing cover further includes a protruding portion, the outer edge portion is disposed around the protruding portion, and the protruding portion protrudes outward relative to the outer edge portion in a direction away from the center of the housing body and extends into the inner ring region of the end wall portion. The protruding portion can increase the expansion space of the battery cell housing, thereby increasing the pressure resistance of the battery cell housing.

[0022] In some embodiments, an explosion-proof pressure relief structure is provided on the protruding portion.

[0023] In the above technical solution, the arrangement of the protruding portion is conducive to the explosion-proof pressure relief structure achieving a reliable explosion-proof pressure relief function.

[0024] In some embodiments, the peripheral wall portion has an inwardly protruding portion, and the inwardly protruding portion protrudes radially along the housing body and abuts against the axial inner side of the outer edge portion.

[0025] In the above technical solution, the peripheral wall portion of the housing body has an inwardly protruding portion, and the inwardly protruding portion protrudes radially along the housing body and abuts against the axial inner side of the outer edge portion. In this way, the friction force between the housing body and the housing cover is greater, and the housing cover is not easily pushed out due to expansion, making the connection between the housing body and the housing cover more firm.

[0026] In some embodiments, the housing body forms the end wall portion through a cold heading process.

[0027] In the above technical solution, the housing body forms the end wall portion through a cold heading process, and the manufacturing process is simple without generating adverse thermal effects.

[0028] In some embodiments, an intermediate member is provided between the positions where the housing body and the housing cover cooperate with each other. Seals are respectively provided between the intermediate member and the housing body and the housing cover. The rough area includes a third area provided on the intermediate member, and the third area faces the seal. The roughness of the third area is greater than the roughness of the outer surface of the housing body and / or the inner surface of the housing cover.

[0029] In the above technical solution, a middleware is provided between the positions where the shell body and the shell cooperate with each other. Seals are respectively provided between the middleware and the shell body and the shell. The rough area includes a third area provided on the middleware, and the third area faces the seal. The roughness of the third area is greater than the roughness of the outer surface of the shell body and / or the inner surface of the shell cover. By providing the middleware, the middleware can be directly roughened. When the shell body and the shell cover do not need to be roughened, the manufacturing process of the shell body and the shell cover can be simplified. Of course, the shell body and the shell cover can also be roughened simultaneously.

[0030] In some embodiments, the seal is a plastic sealing material piece.

[0031] In the above embodiments, the seal is a plastic sealing material piece. The plastic sealing material piece has good sealing performance, good manufacturability, and low cost. It can improve the cooperation reliability between the shell body and the shell cover and can save space.

[0032] In a second aspect, a battery cell includes an electrode assembly and the housing assembly of the above battery cell, and the electrode assembly is disposed inside the housing assembly.

[0033] In a third aspect, a battery includes a plurality of the above battery cells.

[0034] In a fourth aspect, an electrical device includes the above battery. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0036] Figure 1 Structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0037] Figure 2 Exploded view of the structure of a battery provided by some embodiments of the present application;

[0038] Figure 3 Structural schematic diagram of the housing assembly of a battery cell provided by some embodiments of the present application;

[0039] Figure 4 Exploded view of the structure of the housing assembly of a battery cell provided by some embodiments of the present application;

[0040] Figure 5 Structural schematic diagram of the housing assembly of a battery cell provided by some other embodiments of the present application;

[0041] Figure 6 Schematic structural diagram of a housing assembly of a battery cell provided in some further embodiments of the present application;

[0042] Figure 7 Schematic structural diagram of a housing assembly of a battery cell provided in some other embodiments of the present application.

[0043] Icons: 10000 - vehicle; 1000 - battery; 2000 - controller; 3000 - motor; 100 - battery cell; 200 - box body; 201 - first box body; 202 - second box body; 10 - housing body; 101 - peripheral wall portion; 102 - end wall portion; 103 - inner convex portion; 104 - opening; 11 - housing cover; 111 - protruding portion; 112 - outer edge portion; 13 - first region; 14 - second region; 15 - seal; 16 - intermediate member; 17 - third region; 20 - rough region; 30 - housing assembly. Detailed implementation manners

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0046] Referring to "embodiments" in the present application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0047] In the description of the present application, it should be noted that unless otherwise clearly specified or limited, the terms "installed", "connected", "joined", and "attached" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0048] In the present application, the term "and / or" is merely an association relationship describing associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally indicates that the associated objects before and after are in an "or" relationship.

[0049] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are only illustrative and should not constitute any limitation to the present application.

[0050] The term "a plurality of" as used in the present application refers to two or more including two.

[0051] In the present application, the battery cell may include a primary battery or a secondary battery, and may also include a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc. The embodiments of the present application do not limit this. The battery cell may be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, and the embodiments of the present application do not limit this either. Generally, the battery cell is divided into three types according to the encapsulation method: a cylindrical battery cell, a square battery cell, and a soft-pack battery cell, and the embodiments of the present application do not limit this either.

[0052] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack, etc. Generally, the battery may include a box body for encapsulating one or more battery cells or a plurality of battery modules. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells. Alternatively, the battery of the present application may not include the above box body, which will not be elaborated here.

[0053] The battery cell includes a housing, an electrode assembly, and an electrolyte. The housing is used to accommodate the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode tab and a negative electrode tab. The battery cell mainly operates by the movement of metal ions between the positive electrode tab and the negative electrode tab. The positive electrode tab includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector without the coated positive active material layer protrudes from the positive current collector with the coated positive active material layer. The positive current collector without the coated positive active material layer serves as the positive electrode ear. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector without the coated negative active material layer protrudes from the negative current collector with the coated negative active material layer. The negative current collector without the coated negative active material layer serves as the negative electrode ear. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. In order to ensure passing a large current without fusing, the number of positive electrode ears is multiple and stacked together, and the number of negative electrode ears is multiple and stacked together.

[0054] The battery cell includes a separator, and the separator can be a separator membrane. The material of the separator membrane can be polypropylene or polyethylene, etc. In addition, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0055] In recent years, new energy vehicles have achieved leapfrog development. In the field of electric vehicles, the power battery, as the power source of the electric vehicle, plays an irreplaceable and important role. Among them, the battery, as the core component of new energy vehicles, has high requirements both in terms of safety and cycle service life.

[0056] The inventor found that in general power batteries, in order to enable the battery to obtain sufficient power, multiple battery cells of the battery are usually stacked in an arranged manner. However, a large amount of heat will be generated during the continuous charge and discharge process of the battery cell, which will cause the internal temperature of the battery cell to rise. Moreover, the structure of stacking multiple battery cells will exacerbate this phenomenon. Due to the weak pressure resistance of the housing of the battery cell, the internal heat expansion of the battery cell will cause the housing of the battery cell to be damaged, which will seriously affect the use performance and service life of the battery cell.

[0057] Based on the above considerations, in order to solve the problem of the weak pressure resistance of the housing of a battery cell, the inventor has conducted in-depth research and designed a housing assembly for a battery cell, including a housing body and a housing cover. The housing cover is covered on the housing body, and a rough area is provided on the surface where the housing cover and the housing body cooperate with each other to increase the friction force between the housing cover and the housing body. When the internal pressure of the housing assembly increases, the friction force can increase accordingly, thereby effectively suppressing the deformation, slippage, etc. of the housing cover, improving the cooperation reliability between the housing cover and the housing body, enhancing the overall airtightness of the housing assembly, and the pressure resistance of the housing assembly, avoiding the damage of the housing assembly caused by the expansion of the battery cell, and improving the safety and service life of the battery cell.

[0058] In addition, since the rough area is provided, the pressure resistance and airtightness of the housing assembly can be improved. Therefore, in some embodiments, compared with the prior art, the sealing ring structure can be omitted. On the one hand, the packaging speed can be increased, the packaging excellent rate can be improved, and the production cost can be reduced. On the other hand, the occupied space of the sealing ring structure is saved, thereby increasing the effective volume inside the housing assembly, and further improving the energy density of the battery cell while ensuring the pressure resistance performance.

[0059] The battery disclosed in the embodiments of the present application can be but is not limited to being used in power-consuming devices such as vehicles, ships or aircraft. The power supply system of the power-consuming device can be composed of the battery disclosed in the present application, etc., which is beneficial to expanding the application range of the battery.

[0060] The embodiments of the present application provide a power-consuming device using a battery as a power source. The power-consuming device can be but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles and spaceships, etc.

[0061] For the convenience of description, the following embodiments take a vehicle as an example of a power-consuming device in an embodiment of the present application for illustration.

[0062] Please refer to Figure 1 , Figure 1Schematic structural diagram of vehicle 10000 provided by some embodiments of the present application. Vehicle 10000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery 1000 is disposed inside vehicle 10000, and the battery 1000 can be disposed at the bottom, head, or tail of vehicle 10000. The battery 1000 can be used for power supply of vehicle 10000. For example, the battery 1000 can be used as the operating power source of vehicle 10000. Vehicle 10000 can also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery 1000 to supply power to the motor 3000. For example, it is used for the working power requirements during the start, navigation, and driving of vehicle 10000.

[0063] In some embodiments of the present application, the battery 1000 can not only be used as the operating power source of vehicle 10000, but also as the driving power source of vehicle 10000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 10000.

[0064] Please refer to Figure 2 , Figure 2 Exploded view of the structure of battery 1000 provided by some embodiments of the present application. The battery 1000 includes a box body 200 and a plurality of battery cells 100. The battery cells 100 are accommodated in the box body 200. Among them, the box body 200 is used to provide an assembly space for the battery cells 100, and the box body 200 can adopt various structures. In some embodiments, the box body 200 can include a first box body 201 and a second box body 202. The first box body 201 and the second box body 202 cover each other, and the first box body 201 and the second box body 202 jointly define an assembly space for accommodating the battery cells 100. The second box body 202 can be a hollow structure with one end open, and the first box body 201 can be a plate-like structure. The first box body 201 covers the open side of the second box body 202 so that the first box body 201 and the second box body 202 jointly define an assembly space; the first box body 201 and the second box body 202 can also both be hollow structures with one side open, and the open side of the first box body 201 covers the open side of the second box body 202. Of course, the box body 200 formed by the first box body 201 and the second box body 202 can be in various shapes, such as a cylinder, a cuboid, etc.

[0065] In the battery 1000, multiple battery cells 100 can be connected in series, parallel, or in a combined series-parallel configuration. A combined series-parallel configuration means that there are both series and parallel connections among the multiple battery cells 100. The multiple battery cells 100 can be directly connected in series, parallel, or in a combined series-parallel manner and then the whole formed by the multiple battery cells 100 is accommodated in the box body 200. Of course, the battery 1000 can also be such that multiple battery cells 100 are first connected in series, parallel, or in a combined series-parallel manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a combined series-parallel manner to form a whole and are accommodated in the box body 200. The battery 1000 can also include other structures. For example, the battery 1000 can also include a busbar component for realizing the electrical connection among the multiple battery cells 100.

[0066] For the convenience of description in the following embodiments, the housing assembly 30 of a battery cell 100 in an embodiment of the present application is taken as an example for illustration.

[0067] Please refer to Figure 3 and Figure 4 , Figure 3 which is a schematic structural diagram of a housing assembly 30 of a battery cell 100 provided in some embodiments of the present application. Among them, the housing assembly 30 includes a housing body 10 and a housing cover 11. The housing body 10 has an open end 104, and the housing cover 11 is disposed at the open end 104 to close the open end 104.

[0068] On the mutually cooperating surfaces between the housing cover 11 and the housing body 10, there is a rough area 20. The rough area 20 can increase the friction force between the housing cover 11 and the housing body 10. When the internal pressure of the housing assembly 30 increases, the friction force can increase accordingly, thereby effectively suppressing the deformation and slipping of the housing cover 11, etc., improving the fitting reliability between the housing cover 11 and the housing body 10, enhancing the overall airtightness of the housing assembly 30, as well as the pressure resistance of the housing assembly 30, avoiding the damage of the housing assembly 30 caused by the expansion of the battery cell 100, and improving the safety and service life of the battery cell 100.

[0069] In addition, since the setting of the rough area 20 can improve both the pressure resistance and airtightness of the housing assembly 30, in some embodiments, compared with the prior art, the sealing ring structure can be omitted, thereby improving the packaging speed, enhancing the packaging yield, and reducing the production cost. Moreover, the occupied space of the sealing ring structure is saved, thereby increasing the effective volume inside the housing assembly 30, and further improving the energy density of the battery cell 100 while ensuring the pressure resistance performance.

[0070] Of course, the present application is not limited to this. In other embodiments of the present application, if there is enough space, the sealing ring structure can also be selected, and there is no limitation here.

[0071] It should be noted that the rough area 20 is understood in a broad sense as being located on the mating surfaces between the shell cover 11 and the shell body 10, that is, the rough area 20 is located at the mating position between the shell cover 11 and the shell body 10 and on the mating surfaces, but is not limited to being provided on the surface of any particular component. For example, the rough area 20 can be provided on the shell cover 11, or on the shell body 10, or on other components between the shell cover 11 and the shell body 10, and there is no limitation here. However, as long as the rough area 20 is provided at the mating position between the shell cover 11 and the shell body 10 and on the mating surfaces, the frictional force between the shell cover 11 and the shell body 10 can be increased, thereby improving the mating reliability between the shell cover 11 and the shell body 10, and further increasing the pressure resistance of the housing assembly 30.

[0072] In some embodiments, referring to Figure 3 and Figure 4 , the rough area 20 includes a first area 13 provided on the shell body 10, and the roughness of the first area 13 is greater than the roughness of the remaining areas on the shell body 10 other than the first area 13. Thus, by increasing the local roughness of the shell body 10, the mating reliability between the shell cover 11 and the shell body 10 can be increased, and it is convenient for rough machining, shortening the rough machining time, and the rough area 20 can be targeted at the shell body 10, with a wide range of applications.

[0073] It can be understood that since the rough area 20 is located on the mating surfaces between the shell cover 11 and the shell body 10, the first area 13 is located on the side of the shell body 10 facing the shell cover 11.

[0074] Of course, the present application is not limited to this. For example, in other embodiments of the present application, the entire shell body 10 can also be roughened so that the side of the shell body 10 facing the shell cover 11 has a rough area 20.

[0075] In some embodiments, as Figure 3 and Figure 4 shown, a seal 15 is provided between the shell cover 11 and the shell body 10, and the first area 13 is located at the position of the shell body 10 facing the seal 15. The rough first area 13 has a better bonding ability with the seal 15, can increase the frictional force between the shell body 10 and the seal 15, and the shell body 10 and the seal 15 are not likely to slide, which can enhance the airtightness of the housing assembly 30.

[0076] In some embodiments, referring to Figure 3 and Figure 4, the rough area 20 includes a second area 14 provided on the shell cover 11, and the roughness of the second area 14 is greater than that of the other areas on the shell cover 11 except the second area 14. Thus, by increasing the local roughness of the shell cover 11, the fitting reliability between the shell cover 11 and the shell body 10 can be increased, and it is convenient for rough machining, shortening the rough machining time. Moreover, the rough area 20 can be targeted at the shell cover 11, with a wide range of applications.

[0077] It can be understood that since the rough area 20 is located on the mating surface between the shell cover 11 and the shell body 10, the second area 14 is located on the side of the shell cover 11 facing the shell body 10.

[0078] Of course, the present application is not limited to this. For example, in other embodiments of the present application, the entire shell cover 11 can also be roughened so that the side of the shell cover 11 facing the shell body 10 has a rough area 20.

[0079] In some embodiments, as Figure 3 and Figure 4 shown, a seal 15 is provided between the shell cover 11 and the shell body 10. The second area 14 is located at the position of the shell cover 11 facing the seal 15. The rough second area 14 has a better bonding ability with the seal 15, which can increase the friction between the shell cover 11 and the seal 15. The shell cover 11 and the seal 15 are not easy to slide, and the airtightness of the housing assembly 30 can be enhanced.

[0080] In some embodiments, as Figure 3 and Figure 4 shown, the shell body 10 includes a peripheral wall portion 101 and an end wall portion 102. The end wall portion 102 is connected to the axial end of the peripheral wall portion 101. The end wall portion 102 abuts against the axial outside of the outer edge portion 112 of the shell cover 11 (i.e., on the side away from the central cross-section of the shell body 10 in the axial direction of the shell body 10). The rough area 20 is located between the end wall portion 102 and the outer edge portion 112, which can increase the friction between the end wall portion 102 and the outer edge portion 112, and the direction of the friction force has a more effective anti-slip effect, which can effectively prevent sliding between the end wall portion 102 and the outer edge portion 112, prevent the shell cover 11 from rushing out of the opening 104 of the shell body 10, and further increase the pressure resistance of the housing assembly 30. At the same time, the scheme that the end wall portion 102 abuts against the axial outside of the outer edge portion 112 of the shell cover 11 makes the installation with the shell cover 11 simpler, simplifies the installation steps, and can improve the fitting reliability between the shell body 10 and the shell cover 11. Optionally, the end wall portion 102 is annular.

[0081] In some embodiments, as Figure 3 and Figure 4 shown, the rough area 20 includes a first area 13 located on the inner surface of the end wall portion 102 and / or a second area 14 located on the outer surface of the outer edge portion 112.

[0082] In the above technical solution, the rough area 20 includes a first area 13 on the inner surface of the end wall portion 102 or a second area 14 on the outer surface of the outer edge portion 112, both of which can increase the frictional force between the end wall portion 102 and the outer edge portion 112, inhibit the sliding between the end wall portion 102 and the outer edge portion 112, and further increase the pressure resistance of the housing assembly 30. The rough area 20 includes a first area 13 on the inner surface of the end wall portion 102 and a second area 14 on the outer surface of the outer edge portion 112. When the roughness ratio is applied to both the end wall portion 102 and the outer edge portion 112 instead of just one of them, the effect of increasing the frictional force is better, and the pressure resistance of the housing assembly 30 can be increased better.

[0083] In some embodiments, such as Figure 3 and Figure 4 shown, a seal 15 is provided between the end wall portion 102 and the outer edge portion 112. At the same time, since a rough area 20 is provided between the end wall portion 102 and the outer edge portion 112, the bonding force between the end wall portion 102 and the seal 15, or the bonding force between the outer edge portion 112 and the seal 15, or the bonding forces between the end wall portion 102, the outer edge portion 112 and the seal 15 can be effectively increased, thereby enhancing the airtightness and pressure resistance of the housing assembly 30.

[0084] In some embodiments, such as Figure 3 and Figure 4 shown, the housing cover 11 further includes a protruding portion 111, and the outer edge portion 112 is disposed around the protruding portion 111. The protruding portion 111 protrudes outward relative to the outer edge portion 112 (i.e., in the axial direction of the housing body 10, away from the central cross-section of the housing body 10) and extends into the inner ring area of the end wall portion 102. The protruding portion 111 can increase the expansion space inside the housing assembly 30, and further increase the pressure resistance of the battery cell 100.

[0085] In some embodiments, an explosion-proof and pressure-relief structure, such as an explosion-proof valve or a weak portion, is provided on the protruding portion 111 to have an explosion-proof and pressure-relief function. Thus, by setting the protruding portion 11 extending into the inner ring area of the end wall portion 102, the shielding of the protruding portion 11 by the end wall portion 102 can be avoided. By providing the explosion-proof and pressure-relief structure on the protruding portion 111, the explosion-proof and pressure-relief function can be reliably and effectively achieved.

[0086] This application is not limited thereto. For example, in other embodiments of this application, the protruding portion 111 may not be provided. At this time, the housing cover 11 may be in the form of a flat plate (such as Figure 6 shown) and so on. In addition, other structures such as a liquid injection valve and a terminal post may be provided on the protruding portion 111, which will not be elaborated here.

[0087] In some embodiments, such as Figure 3 andFigure 4 As shown, the peripheral wall portion 101 has a constant cross-sectional shape. By setting the peripheral wall portion 101 to have a constant cross-sectional shape, the accommodation space within the housing assembly 30 can be increased to accommodate a larger volume of the electrode assembly, thereby increasing the capacitance.

[0088] Optionally, the peripheral wall portion 101 can be cylindrical or cuboid. In this case, the axial direction of the housing body 10 can be the axial direction of the cylindrical peripheral wall portion 101, or the length or width direction of the cuboid peripheral wall portion 101, or the direction perpendicular to the housing cover 11. The radial direction of the housing body 10 is the direction perpendicular to the axial direction of the housing body 10.

[0089] In some embodiments, as Figure 3 and Figure 5 shown, the end wall portion 102 of the housing body 10 is formed by a cold heading process. The manufacturing process is simple and requires fewer components, which can improve the sealing performance of the housing assembly 30. The cold heading process does not require heating, is suitable for processing the battery cell 100, and has high safety.

[0090] In some other embodiments, as Figure 6 shown, the peripheral wall portion 101 has an inner convex portion 103 (thus having a non-constant cross-sectional shape). The inner convex portion 103 protrudes along the radial direction of the housing body 10 and abuts against the inner side in the axial direction of the outer edge portion 112 (i.e., on the side closer to the central cross-section of the housing body 10 in the axial direction of the housing body 10). In this way, the housing cover 11 is subjected to more frictional force and is not easily pushed out due to internal expansion, making the connection between the housing cover 11 and the housing body 10 more secure.

[0091] In some embodiments, the housing body 10 having the inner convex portion 103 on the peripheral wall portion 101 can also form the end wall portion 102 and the inner convex portion 103 by a cold heading process. The manufacturing process is simple and requires fewer components, which can improve the sealing performance of the housing assembly 30. The cold heading process does not require heating, is suitable for processing the battery cell 100, and has high safety.

[0092] Please refer to Figure 7 , in some embodiments, an intermediate member 16 is provided between the positions where the housing body 10 and the housing cover 11 cooperate with each other. Sealing members 15 are respectively provided between the intermediate member 16 and the housing body 10 and the housing cover 11. The rough area 20 includes a third area 17 provided on the intermediate member 16. The third area 17 faces the sealing member 15, and the roughness of the third area 17 is greater than the roughness of the outer surface of the housing body 10 and / or the inner surface of the housing cover 11.

[0093] Thus, providing the intermediate member 16 can, on the one hand, improve the pressure resistance of the housing assembly 30, and on the other hand, directly roughen the intermediate member 16 without roughening the housing body 10 and the housing cover 11, simplifying the manufacturing process of the housing body 10 and the housing cover 11.

[0094] However, the present application is not limited thereto. In other embodiments of the present application, when the middleware 16 is provided, rough areas may also be provided at positions corresponding to the seal 15 on both the shell cover 11 and the shell body 10, such as the first area 13 and / or the second area 14 described above, to further improve airtightness and pressure resistance.

[0095] In some embodiments, the seal 15 mentioned in any of the above embodiments may be a plastic sealing material part. The plastic sealing material part has a better bonding effect with the shell cover 11 and the shell body 10, good sealing performance, easy operation, and low cost, and can improve the connection reliability between the shell body 10 and the shell cover 11.

[0096] It should be noted that the plastic sealing material part refers to a material part that can be deformed by heat and re-bond with adjacent components. The setting of the rough area 20 can improve the heat conduction performance and shorten the hot pressing time of the plastic sealing material part. For example, in some examples, the seal 15 may be sealant, etc., so that it is easy to obtain and use.

[0097] Moreover, by using a plastic sealing material part to replace the sealing ring structure, the packaging speed can be increased, the packaging excellent rate can be improved, and the production cost can be reduced. Moreover, the occupied space of the sealing ring structure is saved, thereby increasing the effective volume inside the housing assembly 30, and then the energy density of the battery cell 100 can be improved while ensuring the pressure resistance performance.

[0098] For example, the plastic sealing material part is provided on the shell cover 11 or the shell body 10, and then the end wall part 102 of the shell body 10 is processed so that the shell body 10 is connected to the shell cover 11, and a reliable connection between the shell cover 11 and the shell body 10 can be achieved to ensure airtightness and pressure resistance.

[0099] The present application provides an embodiment in another aspect, and proposes a battery cell 100, which includes an electrode assembly and the above-mentioned housing assembly 30, and the electrode assembly is arranged inside the housing assembly 30.

[0100] Optionally, the electrode assembly can be first loaded into the shell body 10, then the shell cover 11 is covered on the shell body 10, and then a cold heading process is performed on the connection part between the shell body 10 and the shell cover 11 to realize their connection.

[0101] The present application provides an embodiment in yet another aspect, and proposes a battery 1000, which includes a plurality of the above-mentioned battery cells 100.

[0102] The present application provides an embodiment in yet another aspect, and proposes an electrical device, which includes the above-mentioned battery 1000.

[0103] According to some embodiments of the present application, a sealing member 15 is provided between the housing body 10 and the housing cover 11, and a sealed connection structure is formed by upsetting through a cold heading process. A roughened first area 13 is machined at the joint between the housing body 10 and the sealing member 15, and a roughened second area 14 is machined at the joint between the housing cover 11 and the sealing member 15. The first area 13 and the second area 14 are used to make the combination between the housing body 10, the sealing member 15, and the housing cover 11 more compact, thereby enhancing the airtightness of the overall structure. When gas is generated inside the housing assembly 30, a greater frictional force can be provided between the roughened first area 13 and the second area 14 to prevent the housing cover 11 from deforming and slipping, enhancing the pressure resistance of the housing assembly 30, and thus effectively enhancing the pressure resistance of the battery cell 100.

[0104] The sealing member 15 is made of a plastic sealing material such as sealant, etc. At the same time, by combining with the roughening treatment of the mating parts of the housing cover 11 and the housing body 10, compared with the prior art which only uses a sealing ring structure, the bonding strength between the housing cover 11, the housing body 10, and the sealing member 15 can be effectively improved, and the airtightness of the housing assembly 30 can be enhanced. At the same time, when a high - pressure failure occurs, the rough area can increase the frictional force between the housing cover 11 and the housing body 10, enhancing the pressure resistance performance of the battery cell 100. Moreover, the housing cover 11 and the housing body 10 with rough areas increase the heat conduction efficiency with the plastic sealing material, shortening the processing time.

[0105] In addition, compared with the prior art, the sealing ring structure can be omitted, thereby improving the packaging speed, enhancing the packaging excellent rate, and reducing the cost. Moreover, the occupied space of the sealing ring structure is saved, thereby increasing the effective volume inside the housing assembly 30. Furthermore, while ensuring the pressure resistance performance, the energy density of the battery cell 100 can be enhanced.

[0106] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0107] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A housing assembly for a battery cell, wherein, Comprising: A housing body having an opening; And A housing cover disposed at the opening, and a rough area is provided on the mating surfaces between the housing cover and the housing body.

2. The housing assembly of the battery cell according to claim 1, wherein, The rough area includes a first area provided on the housing body, and the roughness of the first area is greater than that of the other areas on the housing body except the first area.

3. The housing assembly of the battery cell according to claim 2, wherein, A seal is provided between the housing cover and the housing body, and the first area is located at the position of the housing body facing the seal.

4. The housing assembly of the battery cell according to claim 1, wherein, The rough area includes a second area provided on the housing cover, and the roughness of the second area is greater than that of the other areas on the housing cover except the second area.

5. The housing assembly of the battery cell according to claim 4, wherein, A seal is provided between the housing cover and the housing body, and the second area is located at the position of the housing cover facing the seal.

6. The housing assembly of the battery cell according to claim 1, wherein, The housing body includes a peripheral wall portion and an end wall portion. The end wall portion is connected to the axial end of the peripheral wall portion, and the end wall portion abuts against the axial outer side of the outer edge portion of the housing cover. The rough area is located between the end wall portion and the outer edge portion.

7. The housing assembly of the battery cell according to claim 6, wherein, The rough area includes a first area on the inner surface of the end wall portion and / or a second area on the outer surface of the outer edge portion.

8. The housing assembly of the battery cell according to claim 6, wherein, A seal is provided between the end wall portion and the outer edge portion.

9. The housing assembly of the battery cell according to claim 6, wherein, The housing cover further includes a protruding portion, and the outer edge portion is arranged around the protruding portion. The protruding portion protrudes outward relative to the outer edge portion and extends into the inner ring area of the end wall portion.

10. The housing assembly of the battery cell according to claim 9, wherein, An explosion-proof and pressure-relief structure is provided on the protruding portion.

11. The housing assembly of the battery cell according to claim 6, wherein, The peripheral wall portion has an inward convex portion that protrudes radially along the housing body and abuts against the axial inner side of the outer edge portion.

12. The housing assembly of the battery cell according to claim 6, wherein, The end wall portion of the housing body is formed by a cold heading process.

13. The housing assembly of the battery cell according to claim 1, wherein, An intermediate member is provided between the mating positions of the housing body and the housing cover. Seals are respectively provided between the intermediate member and the housing body and the housing cover. The rough area includes a third area provided on the intermediate member. The third area faces the seal, and the roughness of the third area is greater than that of the outer surface of the housing body and / or the inner surface of the housing cover.

14. The housing assembly of the battery cell according to any one of claims 3, 5, 8, and 13, wherein, The seal is a plastic sealing material member.

15. A battery cell, wherein, Comprising an electrode assembly and a housing assembly of the battery cell according to any one of claims 1-14, and the electrode assembly is disposed inside the housing assembly.

16. A battery, wherein, Comprising a plurality of battery cells according to claim 15.

17. An electrical device, where Comprising a battery according to claim 16.

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