Battery monomer, battery and electric equipment

Abstract

The utility model relates to a battery monomer, a battery and electric equipment, the battery monomer comprises a shell and a cover body, the shell is provided with an opening part, and the cover body covers the opening part; wherein a first locking structure is arranged on the inner wall of the shell, a second locking structure is arranged on the side, facing the shell, of the cover body in a protruding mode, and the second locking structure is matched with the first locking structure in a locking mode. The battery comprises the battery monomer. The electric equipment comprises the battery. According to the battery monomer, the battery and the electric equipment, the shell and the cover body of the battery monomer are respectively provided with the locking structures which can be matched with each other, and mechanical locking force between the two locking structures needs to be overcome before a welding seam is torn by generated high-pressure and high-temperature gas when the battery monomer is subjected to vibration or thermal runaway, so that the risk that the welding seam of the shell and the cover body is torn is reduced; the bonding strength of the shell and the cover body is improved, and the structural stability of the shell and the cover body is improved.

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] With the popularization and promotion of new energy vehicles, the charging and discharging performance and endurance of new energy vehicles have attracted increasing attention and attention. Batteries are widely used as the power source of new energy vehicles. In the battery, the battery cell includes a cover and a shell, which are sealed by welding and form a space for placing the electrode assembly.

[0003] During the operation of the battery, when the battery cell expands or stress is applied to the battery cell due to reasons such as the electrochemical reaction inside the battery cell, the heat affected area formed by welding of the cover and the shell is prone to break under the action of stress, and the battery cell is prone to expansion and deformation, thereby affecting the use of the battery cell. Utility Model Content

[0004] Based on this, it is necessary to provide a battery cell, a battery and an electrical device to address the problem of poor strength of the connection structure between the cover and the shell in the battery cell.

[0005] A battery cell includes a shell and a cover, wherein the shell has an opening, and the cover is disposed on the opening; wherein a first locking structure is disposed on the inner wall of the shell, and a second locking structure is convexly disposed on the side of the cover facing the shell, and the second locking structure is locked and matched with the first locking structure. The battery cell described above is provided with locking structures that can cooperate with each other on the shell and the cover respectively, and when subjected to vibration or thermal runaway, the mechanical locking force between the two locking structures needs to be overcome before the high-pressure and high-temperature gas generated tears the weld, thereby reducing the risk of the weld between the shell and the cover being torn, improving the bonding strength between the shell and the cover, and facilitating the improvement of the structural stability of the shell and the cover.

[0006] In some embodiments, the first locking structure includes at least one first tooth portion, and the second locking structure includes at least one second tooth portion, and the second tooth portion meshes with the first tooth portion. In this way, the two locking structures are locked by meshing, thereby helping to strengthen the bonding strength between the shell and the cover.

[0007] In some embodiments, the first locking structure includes at least two first teeth, and all the first teeth are arranged side by side along the height direction of the housing, so that the bonding strength between the housing and the cover can be further enhanced in the height direction of the housing.

[0008] In some embodiments, all first teeth are protrudingly disposed on the inner wall of the housing, so that the first locking structure can be smoothly disposed on the housing, and the structural design is reasonable.

[0009] In some embodiments, the inner wall of the housing is provided with a groove, and all the first teeth are protruding from the bottom wall of the groove; and in the depth direction of the groove, all the first teeth do not exceed the groove. In this way, by providing a groove on the inner wall of the housing, all the first teeth are protruding from the bottom wall of the groove, and in the depth direction of the groove, all the first teeth do not exceed the groove, the housing can be effectively utilized, and the first teeth are prevented from occupying additional space, thereby improving the space utilization rate of the housing.

[0010] In some embodiments, each first tooth portion has a first corner portion on a side facing away from the inner wall of the housing, and the first corner portion is configured as a sharp corner or a rounded corner. In this way, the first corner portion of the first tooth portion can be flexibly designed according to actual conditions, which is more practical.

[0011] In some embodiments, the second locking structure includes at least two second teeth, and all the second teeth are arranged side by side along the height direction of the housing, so that the bonding strength between the housing and the cover can be further enhanced in the height direction of the housing.

[0012] In some embodiments, each second tooth portion has a second corner on a side facing away from the inner wall of the housing, and the second corner is configured as a sharp corner or a rounded corner. In this way, the second corner of the second tooth portion can be flexibly designed according to actual conditions, which is more practical.

[0013] In some embodiments, the second locking structure further comprises a locking body, the locking body is convexly arranged on the side of the cover body facing the housing, and all the second teeth are fixed to the outer periphery of the locking body. In this way, by fixing all the second teeth to the locking body and connecting the locking body to the cover body, the installation and fixation of the second teeth can be facilitated, and the space between the housing and the cover body can be effectively utilized.

[0014] In some embodiments, the battery cell further includes a lower insulating member and an elastic member contained in the insulating member, one end of the elastic member is fixed in the insulating member, the other end of the elastic member is in an active state and faces the locking body, and the lower insulating member is arranged on the side of the cover body facing the shell and is arranged adjacent to the locking body; when the cover body is covered on the opening, the locking body can be elastically deformed under pressure, and the other end of the elastic member can push the locking body and provide a restoring force for resetting the locking body. In this way, by arranging the elastic member on the lower insulating member, the two locking structures can be smoothly engaged, thereby improving the bonding strength between the shell and the cover body.

[0015] In some embodiments, the bottom of the lower insulating member is flush with the bottom of the locking body, a through hole is formed through the bottom of the lower insulating member, one end of the elastic member is fixed in the through hole and the other end is movable. In this way, the elastic member can be smoothly arranged on the lower insulating member, thereby improving the space utilization of the lower insulating member.

[0016] In some embodiments, along the height direction of the shell, the shell is divided into a heat-affected zone and a main body zone located below the heat-affected zone, and the first locking structure is provided in the heat-affected zone. In this way, the structural strength of the heat-affected zone of the shell can be effectively improved, the risk of the weld between the shell and the cover being torn is reduced, the bonding strength between the shell and the cover is improved, and the structural stability of the shell and the cover is improved.

[0017] A battery includes the above-mentioned battery cell. The above-mentioned battery reduces the risk of the weld between the battery cell shell and the cover being torn, improves the bonding strength between the battery cell shell and the cover, and is conducive to improving the use stability of the battery.

[0018] An electric device includes the battery. The electric device improves the bonding strength between the battery shell and the cover, which is beneficial to improving the use stability of the battery and facilitating continuous power supply of the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of electrical equipment in some embodiments of the present application.

[0020] Figure 2 Schematic diagram of a battery in some embodiments of the present application.

[0021] Figure 3 This is a schematic diagram of a battery cell in some embodiments of the present application.

[0022] Figure 4 for Figure 3 Left side view of the battery cell shown.

[0023] Figure 5 for Figure 3 An exploded view of a battery cell is shown.

[0024] Figure 6 for Figure 5 A partial enlarged view of the battery cell shown.

[0025] Figure 7 for Figure 5 A partial enlarged view of point B of the battery cell shown.

[0026] Figure 8 This is a schematic diagram of the first locking structure and the second locking structure being unlocked in some embodiments of the present application.

[0027] Fig. 9 for Figure 8 Schematic diagram of the first locking structure and the second locking structure being locked.

[0028] Fig.10 for Fig. 9 An axonometric view showing the first locking structure and the second locking structure being locked.

[0029] Fig.11 Schematic diagram of the first locking structure and the second locking structure in other embodiments of the present application when they are not locked.

[0030] Reference numerals:

[0031] 10. Vehicle; 11. Controller; 12. Motor; 20. Battery; 21a. First part; 21b. Second part; 21. Battery case; 22. Battery cell; 100. Shell; 101. Opening; 102. Groove; 103. Heat-affected zone; 104. Main body; 200. Cover; 300. First locking structure; 310. First tooth portion; 311. First corner portion; 400. Second locking structure; 410. Second tooth portion; 411. Second corner portion; 420. Locking body; 500. Lower insulating member; 501. Through hole; 600. Elastic member; 700. Electrode terminal. DETAILED DESCRIPTION

[0032] 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.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0034] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship 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.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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.

[0039] 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 those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] With the popularization and promotion of new energy vehicles, the charging and discharging performance and endurance of new energy vehicles have attracted increasing attention and attention. Batteries are widely used as the power source of new energy vehicles. In the battery, the battery cell includes a cover and a shell, which are sealed by welding and form a space for placing the electrode assembly.

[0041] During the operation of the battery, when the battery cell expands or stress is applied to the battery cell due to reasons such as the electrochemical reaction inside the battery cell, the heat affected area formed by welding of the cover and the shell is prone to break under the action of stress, and the battery cell is prone to expansion and deformation, thereby affecting the use of the battery cell.

[0042] Based on the above considerations and after in-depth research, the present application designs a battery cell, a battery and an electrical device. In the battery cell, locking structures that can cooperate with each other are respectively arranged on the shell and the cover. When subjected to vibration or thermal runaway, the mechanical locking force between the two locking structures needs to be overcome before the high-pressure and high-temperature gas generated tears the weld, thereby reducing the risk of the weld between the shell and the cover being torn, improving the bonding strength between the shell and the cover, and facilitating improving the structural stability of the shell and the cover.

[0043] The battery box disclosed in the embodiment of the present application can be used in, but is not limited to, electrical equipment such as vehicles, ships or aircraft.

[0044] The present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, 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 a railway electric tool, 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.

[0045] For the convenience of description, the following embodiments are described by taking a vehicle 10 as an example of an electrical device in an embodiment of the present application.

[0046] Please refer to Figure 1 The vehicle 10 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle. A battery 20 is provided inside the vehicle 10. The battery 20 may be provided at the bottom, the head or the tail of the vehicle 10. The battery 20 may be used to power the vehicle 10. For example, the battery 20 may be used as an operating power source for the vehicle 10. The vehicle 10 may further include a controller 11 and a motor 12. The controller 11 is used to control the battery 20 to power the motor 12, for example, to meet the power requirements for starting, navigating and driving the vehicle 10.

[0047] In some embodiments of the present application, the battery 20 can not only serve as an operating power source for the vehicle 10 , but also serve as a driving power source for the vehicle 10 , replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 10 .

[0048] Please refer to Figure 2The battery 20 includes a battery case 21 and a battery cell 22, and the battery cell 22 is contained in the battery case 21. The battery case 21 is used to provide a storage space for the battery cell 22. In some embodiments, the number of the battery cases 21 is two, namely, a first part 21a and a second part 21b, the first part 21a and the second part 21b cover each other, and the first part 21a and the second part 21b jointly define a storage space for accommodating the battery cell 22. Of course, the storage space formed by the first part 21a and the second part 21b can be in various shapes, such as a cylinder, a cuboid, etc.

[0049] In the battery 20, there can be multiple battery cells 22, and the multiple battery cells 22 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 22 are both connected in series and in parallel. The multiple battery cells 22 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 22 is accommodated in the battery box 21; of course, the battery 20 can also be a battery 20 module formed by connecting multiple battery cells 22 in series, in parallel, or in mixed connection, and then the multiple battery 20 modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the battery box 21.

[0050] Each battery cell 22 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 22 may be cylindrical, flat, rectangular, or in other shapes, and the present application embodiment does not limit this.

[0051] Please refer to Figures 3 to 5 In one embodiment, the battery cell 22 includes a shell 100 and a cover 200, the shell 100 has an opening 101, and the cover 200 is covered on the opening 101; wherein, the inner wall of the shell 100 is provided with a first locking structure 300, and the cover 200 is provided with a second locking structure 400 protruding from one side of the shell 100, and the second locking structure 400 is locked and matched with the first locking structure 300.

[0052] It should be noted that when the cover 200 is covered on the opening 101 , the second locking structure 400 is locked with the first locking structure 300 ; when the cover 200 is removed from the opening 101 , the second locking structure 400 is unlocked with the first locking structure 300 .

[0053] In the embodiment of the present application, the housing 100 is used to form an internal environment, and the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The housing 100 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, etc. Specifically, the shape of the housing 100 can be determined according to the specific shape and size of the electrode assembly. The material of the housing 100 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not limit this.

[0054] In the embodiment of the present application, the housing 100 has an opening 101 along its height direction, and the battery cell 22 is sealed by welding the cover 200 to the opening 101 at one end of the housing 100. Optionally, the opening 101 is provided on the top side of the housing 100.

[0055] In the embodiment of the present application, the cover 200 refers to a component that covers the opening 101 of the housing 100 to isolate the internal environment of the battery cell 22 from the external environment. The cover 200 can be of various shapes and sizes. Specifically, the cover 200 is adapted to the shape of the housing 100 to match the housing 100. The material of the cover 200 can be various, for example, it is made of a material with a certain hardness and strength (such as aluminum alloy). The cover 200 is not easily deformed when squeezed and collided, so that the battery cell 22 can have a higher structural strength.

[0056] In the embodiment of the present application, the first locking structure 300 is configured as a component provided on the inner wall of the housing 100, and the first locking structure 300 is used to cooperate with the second locking structure 400. Specifically, the first locking structure 300 and the inner wall of the housing 100 can be an integrated structure, for example, the first locking structure 300 is integrally formed on the inner wall of the housing 100 by casting, stamping, etc., with good integrity and high structural strength; or, the first locking structure 300 and the inner wall of the housing 100 can also be a split structure, for example, the first locking structure 300 can be fixed to the inner wall of the housing 100 by welding or riveting, which is convenient for maintenance and replacement of the first locking structure 300.

[0057] In the embodiment of the present application, the second locking structure 400 is configured as a component provided on the side of the cover body 200 facing the housing 100, and the second locking structure 400 is used to cooperate with the first locking structure 300. Specifically, the second locking structure 400 and the cover body 200 can be an integral structure, for example, the second locking structure 400 is integrally formed on the cover body 200 by injection molding or the like, with good integrity and high structural strength; or, the second locking structure 400 and the cover body 200 can also be a split structure, for example, the second locking structure 400 can be fixed to the cover body 200 by welding or riveting.

[0058] The above-mentioned battery cell 22 is respectively provided with locking structures that can cooperate with each other on the shell 100 and the cover body 200. When subjected to vibration or thermal runaway, the mechanical locking force between the two locking structures needs to be overcome before the high-pressure and high-temperature gas generated tears the weld, thereby reducing the risk of the weld between the shell 100 and the cover body 200 being torn, improving the bonding strength between the shell 100 and the cover body 200, and facilitating improving the structural stability of the shell 100 and the cover body 200.

[0059] According to some embodiments of this application, please refer to Figure 6 to Figure 7 The first locking structure 300 includes at least one first tooth portion 310 , and the second locking structure 400 includes at least one second tooth portion 410 , and the second tooth portion 410 is meshed with the first tooth portion 310 .

[0060] In an embodiment of the present application, at least one first tooth portion 310, that is, the number of first tooth portions 310 is not limited to one. When the number of first tooth portions 310 is at least two, a slot can be formed between two adjacent first tooth portions 310 to engage with the second tooth portion 410.

[0061] In the embodiment of the present application, at least one second tooth portion 410, that is, the number of the second tooth portions 410 is not limited to one. When the number of the second tooth portions 410 is at least two, a slot can be formed between two adjacent second tooth portions 410 to engage with the first tooth portion 310. Optionally, the number of the second tooth portions 410 may be the same as or different from the number of the first tooth portions 310, and the design is performed according to actual needs.

[0062] Through the above arrangement, the two locking structures are locked by means of meshing, thereby helping to strengthen the combination strength between the housing 100 and the cover 200 .

[0063] According to some embodiments of this application, please refer to Figure 6 The first locking structure 300 includes at least two first tooth portions 310 , and all the first tooth portions 310 are arranged side by side along the height direction of the housing 100 .

[0064] It should be noted that the height direction of the housing 100 is Figure 6 Z direction shown.

[0065] In an embodiment of the present application, in the height direction of the shell 100, a certain spacing may be set between two adjacent first tooth portions 310, for example, all the first tooth portions 310 are distributed side by side with equal spacing along the height direction of the shell 100; in the height direction of the shell 100, no spacing may be set between two adjacent first tooth portions 310, for example, all the first tooth portions 310 are distributed closely and side by side along the height direction of the shell 100.

[0066] In the embodiment of the present application, the shapes and sizes of all the first teeth 310 may be exactly the same to facilitate batch processing of the first teeth 310 ; the shapes and sizes of all the first teeth 310 may also be different to be set as needed according to different positions.

[0067] Through the above arrangement, the bonding strength between the housing 100 and the cover 200 can be further enhanced in the height direction of the housing 100 .

[0068] According to some embodiments of this application, please refer to Figure 8 and Fig. 9 All the first teeth 310 are protrudingly disposed on the inner wall of the housing 100 .

[0069] It should be noted that the inner wall of the shell 100 is a planar structure, the first tooth portion 310 is protruded from the planar structure, and the setting of the first tooth portion 310 cannot interfere with the insertion of the electrode assembly into the shell. The size of the first tooth portion 310 protruding from the inner wall of the shell 100 needs to be within a preset range.

[0070] In an embodiment of the present application, the dimensions of each first tooth portion 310 protruding from the inner wall of the shell 100 can be the same to facilitate batch processing of each first tooth portion 310; the dimensions of each first tooth portion 310 protruding from the inner wall of the shell 100 can also be different to be set as needed according to different positions.

[0071] Through the above arrangement, the first locking structure 300 can be smoothly arranged on the housing 100 , and the structural design is reasonable.

[0072] According to some embodiments of this application, please refer to Fig.11 The inner wall of the housing 100 is provided with a groove 102 , and all the first teeth 310 are protruded from the bottom wall of the groove 102 ; and in the depth direction of the groove 102 , all the first teeth 310 do not exceed the groove 102 .

[0073] It should be noted that the depth direction of the groove 102 is Fig.10 X direction shown.

[0074] In the embodiment of the present application, the depth of the groove 102 is less than the wall thickness of the housing 100, and the shape of the groove 102 can be a square groove or a circular groove or other shapes. Here, the shape of the groove 102 is not specifically limited.

[0075] In an embodiment of the present application, the dimensions of each first tooth portion 310 protruding from the bottom wall of the groove 102 can be the same to facilitate batch processing of each first tooth portion 310; the dimensions of each first tooth portion 310 protruding from the bottom wall of the groove 102 can also be different to be set as needed according to different positions.

[0076] Through the above-mentioned arrangement, by opening a groove 102 on the inner wall of the shell 100, all the first tooth portions 310 are protruded from the bottom wall of the groove 102, and all the first tooth portions 310 do not extend beyond the groove 102 in the depth direction of the groove 102. The shell 100 can be effectively utilized, avoiding the first tooth portions 310 from occupying additional space, thereby improving the space utilization rate of the shell 100.

[0077] According to some embodiments of this application, please refer to Fig.11 and Figure 8 The first tooth portions 310 have a first corner portion 311 on a side facing away from the inner wall of the housing 100 , and the first corner portion 311 is configured as a sharp corner or a rounded corner.

[0078] It should be noted that when the first corner portion 311 is a sharp angle, the mechanical bonding strength between the first tooth portion 310 and the second tooth portion 410 is higher; when the first corner portion 311 is a rounded angle, the risk of scratching the electrode assembly can be reduced; the specific setting of the first corner portion 311 can be flexibly selected according to actual needs.

[0079] In the embodiment of the present application, the first corner 311 of each first tooth portion 310 is configured as an acute angle. The cross-sectional outer contour of any first tooth portion 310 may be a triangle, a semicircular arc, or other irregular shapes, and the cross-sectional outer contour shape of the first tooth portion 310 is not specifically limited here.

[0080] Through the above arrangement, the first corner portion 311 of the first tooth portion 310 can be flexibly designed according to actual conditions, which is more practical.

[0081] According to some embodiments of this application, please refer to Fig. 9 and Fig.10 The second locking structure 400 includes at least two second tooth portions 410 , and all the second tooth portions 410 are arranged side by side along the height direction of the housing 100 .

[0082] In an embodiment of the present application, in the height direction of the shell 100, two adjacent second tooth portions 410 may be arranged at a certain interval, for example, all the second tooth portions 410 are arranged side by side with equal intervals along the height direction of the shell 100; in the height direction of the shell 100, two adjacent second tooth portions 410 may also not be arranged at a certain interval, for example, all the second tooth portions 410 are arranged closely and side by side along the height direction of the shell 100.

[0083] In the embodiment of the present application, the shapes and sizes of all the second teeth 410 may be exactly the same to facilitate batch processing of the second teeth 410 ; the shapes and sizes of all the second teeth 410 may also be different to be set as needed according to different positions.

[0084] Through the above arrangement, the bonding strength between the housing 100 and the cover 200 can be further enhanced in the height direction of the housing 100 .

[0085] According to some embodiments of this application, please refer to Fig.11 and Figure 8 The second tooth portions 410 have a second corner portion 411 on a side facing away from the inner wall of the housing 100 , and the second corner portion 411 is configured as a sharp corner or a rounded corner.

[0086] It should be noted that when the second corner 411 is a sharp angle, the mechanical bonding strength between the second tooth portion 410 and the first tooth portion 310 is higher; when the second corner 411 is a rounded angle, the risk of scratching the electrode assembly can be reduced; the specific setting of the second corner 411 can be flexibly selected according to actual needs.

[0087] In the embodiment of the present application, the second corner 411 of each second tooth portion 410 is configured as an acute angle. The cross-sectional outer contour of any second tooth portion 410 may be a triangle, a semicircular arc, or other irregular shapes, and the cross-sectional outer contour shape of the second tooth portion 410 is not specifically limited here.

[0088] Through the above arrangement, the second corner portion 411 of the second tooth portion 410 can be flexibly designed according to actual conditions, which is more practical.

[0089] According to some embodiments of this application, please refer to Figure 8 The second locking structure 400 further includes a locking body 420 , which is protruding from a side of the cover 200 facing the housing 100 , and all the second teeth 410 are fixed to the outer periphery of the locking body 420 .

[0090] In an embodiment of the present application, the locking body 420 is configured as a member for fixing the second tooth portion 410. The locking body 420 is a sheet-like structure, which can fix the second tooth portion 410 and does not hinder the entry of the electrode assembly into the shell. The number of locking bodies 420 is not limited to one. For example, when the cover body 200 is a cubic structure, the cover body 200 has four different peripheral sides, and four locking bodies 420 can be convexly provided on the cover body 200. The four locking bodies 420 are respectively located on the four peripheral sides of the cover body 200, and a corresponding second tooth portion 410 is provided on each locking body 420, so as to further strengthen the bonding strength between the cover body 200 and the shell 100. Optionally, the locking body 420 is a spring sheet that can undergo elastic deformation.

[0091] In an embodiment of the present application, the locking body 420 and the cover body 200 can be connected in a non-detachable manner, for example, the locking body 420 is integrally formed on the cover body 200; or, the locking body 420 and the cover body 200 can be connected in a detachable manner, for example, the locking body 420 is screwed, snapped or plugged into the cover body 200.

[0092] In an embodiment of the present application, the locking body 420 and each second tooth portion 410 can be an integral structure, for example, each second tooth portion 410 is integrally formed on the locking body 420 by injection molding or the like, with good integrity and high structural strength; or, the locking body 420 and each second tooth portion 410 are a split structure, for example, each second tooth portion 410 is fixed to the locking body 420 by welding or riveting.

[0093] Through the above arrangement, by fixing all the second tooth portions 410 to the locking body 420 and connecting the locking body 420 to the cover body 200 , the second tooth portions 410 can be easily installed and fixed, and the space between the housing 100 and the cover body 200 can be effectively utilized.

[0094] According to some embodiments of this application, please refer to Figure 8 The battery cell 22 also includes a lower insulating member 500 and an elastic member 600 accommodated in the insulating member, one end of the elastic member 600 is fixed in the insulating member, and the other end of the elastic member 600 is in an active state and faces the locking body 420. The lower insulating member 500 is arranged on the side of the cover body 200 facing the shell 100 and is arranged adjacent to the locking body 420; when the cover body 200 is covered on the opening portion 101, the locking body 420 can be elastically deformed under pressure, and the other end of the elastic member 600 can push the locking body 420 and provide a restoring force for resetting the locking body 420.

[0095] It should be noted that in the process of covering the cover body 200 on the opening portion 101, when the second locking structure 400 moves downward, the second tooth portion 410 of the second locking structure 400 will be blocked by the first tooth portion 310, and the locking body 420 of the second locking structure 400 will push the lower insulating member 500, and the other end of the elastic member 600 is pressed by the locking body 420. At this time, the elastic member 600 is in a compressed state; the second locking structure 400 continues to move downward until all the second tooth portions 410 are fully engaged with all the first tooth portions 310. At this time, the elastic member 600 is not pressed and due to the elastic restoration, the second locking structure 400 removes the pushing force on the lower insulating member 500, and the second locking structure 400 is locked with the first locking structure 300. At this time, the cover body 200 and the shell 100 are initially fixed, which is convenient for the subsequent welding and fixation of the cover body 200 and the shell 100.

[0096] In an embodiment of the present application, the battery cell 22 further includes an electrode terminal 700, which is disposed in the cover body 200 along the thickness direction of the cover body 200 and is used to be electrically connected to the electrode assembly of the battery cell 22. The lower insulating member 500 is configured as a component for isolating the cover body 200 and the electrode terminal to reduce the risk of short circuit. Exemplarily, the lower insulating member 500 may be plastic, rubber, etc. Optionally, a receiving groove may be provided on one side of the cover body 200 facing the housing 100 so that the lower insulating member 500 is received in the receiving groove.

[0097] In the embodiment of the present application, the elastic member 600 is configured as a member for providing a restoring force for resetting the locking body 420. One end of the elastic member 600 is fixed in the insulating member, and the other end of the elastic member 600 is movable and faces the locking body 420. Optionally, the elastic member 600 is a spring or a spring. The number of the elastic members 600 is not limited to one, and the number of the elastic members 600 is not specifically limited herein.

[0098] Through the above configuration, by arranging the elastic member 600 on the lower insulating member 500 , the two locking structures can be smoothly engaged, thereby improving the bonding strength between the housing 100 and the cover 200 .

[0099] According to some embodiments of this application, please refer to Figure 8 The bottom of the lower insulating member 500 is flush with the bottom of the locking body 420 , a through hole 501 is formed through the bottom of the lower insulating member 500 , one end of the elastic member 600 is fixed in the through hole 501 and the other end is in an active state.

[0100] In the embodiment of the present application, the through hole 501 is along Figure 8 The X direction shown runs through the bottom of the lower insulating member 500 , and the through hole 501 may be cylindrical, prism-shaped, or other irregular shapes.

[0101] Through the above arrangement, the elastic member 600 can be smoothly arranged on the lower insulating member 500 , thereby improving the space utilization of the lower insulating member 500 .

[0102] According to some embodiments of this application, please refer to Figure 4 and Figure 6 Along the height direction of the shell 100 , the shell 100 is divided into a heat-affected zone 103 and a main body zone 104 located below the heat-affected zone 103 , and the first locking structure 300 is disposed in the heat-affected zone 103 .

[0103] It should be noted that in the height direction of the housing 100 ( Figure 4 In the Z direction shown in the figure, the heat affected zone 103 is the upper area of ​​the shell 100, and the main body zone 104 is the lower area of ​​the shell 100.

[0104] In the embodiment of the present application, the heat-affected zone 103 refers to a region where the strength changes greatly due to the high heat generated by internal gas production or welding heating, and the body zone 104 refers to a region where the strength changes little due to the high heat generated by welding. Optionally, the heat-affected zone 103 is defined as a region within a range of 6 mm from the opening 101 to the bottom of the opening 101, and the body zone 104 is defined as a region within a range from the heat-affected zone 103 to the bottom of the shell 100.

[0105] Through the above configuration, the structural strength of the heat affected zone 103 of the shell 100 can be effectively improved, the risk of the weld between the shell 100 and the cover body 200 being torn is reduced, the bonding strength between the shell 100 and the cover body 200 is improved, and the structural stability of the shell 100 and the cover body 200 is improved.

[0106] Please refer to Figure 2 In one embodiment, the battery 20 includes the battery cell 22 described above.

[0107] It should be noted that the battery 20 further includes a battery case 21 , a thermal management assembly and other components, and the battery cells 22 are accommodated in the battery case 21 .

[0108] The above-mentioned battery 20 reduces the risk of the weld between the shell 100 and the cover 200 of the battery cell 22 being torn, improves the bonding strength between the shell 100 and the cover 200 of the battery cell 22, and helps to improve the use stability of the battery 20.

[0109] Please refer to Figure 1 In one embodiment, the electrical device includes the battery 20 mentioned above.

[0110] The above-mentioned electrical equipment improves the bonding strength between the shell 100 and the cover 200 of the battery cell 22, which is beneficial to improving the use stability of the battery 20 and facilitating continuous power supply to the electrical equipment.

[0111] According to some embodiments of the present application, see Figures 3 to 11 The present application provides a battery cell 22, which includes a shell 100, a cover 200, a lower insulating member 500 and an elastic member 600 accommodated in the insulating member. The shell 100 has an opening 101, and the cover 200 is covered on the opening 101. The inner wall of the shell 100 is provided with a first locking structure 300, and the cover 200 is protruded from one side of the shell 100 toward the shell 100. The second locking structure 400 is locked and matched with the first locking structure 300.

[0112] Among them, the first locking structure 300 includes at least two first tooth portions 310, and all the first tooth portions 310 are arranged side by side along the height direction of the shell 100. The second locking structure 400 includes a locking body 420 and at least two second tooth portions 410, and all the second tooth portions 410 are arranged side by side along the height direction of the shell 100 on the outer periphery of the locking body 420. The locking body 420 is protruded on the side of the cover body 200 facing the shell 100, and each second tooth portion 410 can engage with each first tooth portion 310. The bottom of the lower insulating member 500 is flush with the bottom of the locking body 420, and a through hole 501 is formed through the bottom of the lower insulating member 500. One end of the elastic member 600 is fixed in the through hole 501 and the other end is movable. The lower insulating member 500 is arranged on the side of the cover body 200 facing the shell 100 and is adjacent to the locking body 420. When the cover body 200 is covered on the opening 101, the locking body 420 can be elastically deformed under pressure, and the other end of the elastic member 600 can push the locking body 420 and provide a restoring force for resetting the locking body 420.

[0113] According to some embodiments of the present application, see Figure 2 The present application provides a battery 20 , and the battery 20 includes the above-mentioned battery cell 22 .

[0114] According to some embodiments of the present application, see Figure 1 The present application provides an electrical device, which includes the battery 20 mentioned above.

[0115] 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 (22), characterized in that: include: A housing (100) having an opening (101); A cover body (200), arranged to cover the opening (101); The inner wall of the shell (100) is provided with a first locking structure (300), and the cover (200) is provided with a second locking structure (400) protruding on one side of the shell (100), and the second locking structure (400) is locked and matched with the first locking structure (300).

2. The battery cell (22) according to claim 1, characterized in that: The first locking structure (300) comprises at least one first tooth portion (310), and the second locking structure (400) comprises at least one second tooth portion (410), wherein the second tooth portion (410) meshes with the first tooth portion (310).

3. The battery cell (22) according to claim 2, characterized in that: The first locking structure (300) comprises at least two first tooth portions (310), and all of the first tooth portions (310) are arranged side by side along the height direction of the housing (100).

4. The battery cell (22) according to claim 3, characterized in that: All of the first teeth (310) are protrudingly disposed on the inner wall of the housing (100).

5. The battery cell (22) according to claim 3, characterized in that: The inner wall of the housing (100) is provided with a groove (102), and all the first teeth (310) are protrudingly arranged on the bottom wall of the groove (102); and in the depth direction of the groove (102), all the first teeth (310) do not extend beyond the groove (102).

6. The battery cell (22) according to claim 3, characterized in that: Each of the first tooth portions (310) has a first corner portion (311) on a side facing away from the inner wall of the housing (100), and the first corner portion (311) is configured as a sharp corner or a rounded corner.

7. The battery cell (22) according to claim 2, characterized in that: The second locking structure (400) comprises at least two second tooth portions (410), and all of the second tooth portions (410) are arranged side by side along the height direction of the housing (100).

8. The battery cell (22) according to claim 7, characterized in that: Each second tooth portion (410) has a second corner portion (411) on a side facing away from the inner wall of the housing (100), and the second corner portion (411) is configured as a sharp corner or a rounded corner.

9. The battery cell (22) according to claim 7, characterized in that: The second locking structure (400) further comprises a locking body (420), wherein the locking body (420) is protruding from a side of the cover body (200) facing the housing (100), and all of the second teeth (410) are fixed to the outer periphery of the locking body (420).

10. The battery cell (22) according to claim 9, characterized in that: The battery cell (22) further comprises a lower insulating member (500) and an elastic member (600) accommodated in the insulating member, one end of the elastic member (600) being fixed in the insulating member, the other end of the elastic member (600) being in an active state and facing the locking body (420), the lower insulating member (500) being arranged on a side of the cover body (200) facing the housing (100) and being arranged adjacent to the locking body (420); When the cover body (200) is covered on the opening (101), the locking body (420) can be elastically deformed under pressure, and the other end of the elastic member (600) can push against the locking body (420) and provide a restoring force for the locking body (420) to return to its original position.

11. The battery cell (22) according to claim 10, characterized in that: The bottom of the lower insulating member (500) is flush with the bottom of the locking body (420), a through hole (501) is provided through the bottom of the lower insulating member (500), one end of the elastic member (600) is fixed in the through hole (501) and the other end is in an active state.

12. The battery cell (22) according to any one of claims 1 to 11, characterized in that: Along the height direction of the shell (100), the shell (100) is divided into a heat-affected zone (103) and a main body zone (104) located below the heat-affected zone (103), and the first locking structure (300) is provided in the heat-affected zone (103).

13. A battery (20), characterized in that: Comprising a battery cell (22) as claimed in any one of claims 1 to 12.

14. An electrical device, characterized in that: Comprising a battery (20) as claimed in claim 13.

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