Battery cells, battery devices and electrical equipment

Abstract

This application relates to a battery cell, a battery device, and an electrical appliance. The battery cell includes: a casing, including a first wall; the first wall includes a first portion, a second portion, and a bent portion, the second portion being closer to or farther from the interior of the casing than the first portion, and the bent portion connecting the first portion and the second portion; and an electrode assembly disposed inside the casing; wherein the yield strength of the material of the first wall is greater than or equal to 115 MPa and less than or equal to 500 MPa; a groove is provided at the end of the first portion connected to the bent portion, and / or, a groove is provided on the bent portion, and / or, a groove is provided at the end of the second portion near the bent portion. In this application, when the first wall is stamped, a groove can be formed simultaneously. The groove acts as a material flow guide, guiding the material of the first wall to flow in a predetermined direction during extrusion, making processing more convenient and improving processing accuracy, so that the final stamped casing meets production requirements.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0002] With the development of new energy technologies, higher demands are placed on battery performance, requiring both high energy density and lightweight design. Therefore, the requirements for the casing materials of battery cells are high; these materials typically require high strength and low weight.

[0003] Therefore, the processing of the battery cell casing, such as stamping, is difficult and has low precision, resulting in the casing not meeting production requirements. Utility Model Content

[0004] Therefore, it is necessary to provide a battery cell, a battery device, and an electrical device to address the problems of high processing difficulty and low processing precision of the battery cell casing.

[0005] In a first aspect, this application provides a battery cell, including a casing and an electrode assembly. The casing includes a first wall; the first wall includes a first portion, a second portion, and a bent portion, wherein the second portion is closer to or farther from the interior of the casing than the first portion, and the bent portion connects the first portion and the second portion; the electrode assembly is disposed inside the casing; wherein the yield strength of the material of the first wall is greater than or equal to 115 MPa and less than or equal to 500 MPa; a groove is provided at one end of the first portion near the bent portion, and / or, a groove is provided on the bent portion, and / or, a groove is provided at one end of the second portion near the bent portion.

[0006] With the above structure, when the first wall of the outer shell of the battery cell is stamped, a groove can be formed simultaneously. The groove can act as a material flow guide, guiding the material of the first wall to flow in a preset direction during extrusion, which makes processing more convenient and improves processing accuracy, so that the final stamped shell can meet production requirements.

[0007] In some embodiments, the second portion includes a first surface and a second surface disposed opposite to each other along the thickness direction of the first wall, the first surface being disposed away from the interior of the housing, and the second portion being closer to the interior of the housing than the first portion; wherein, the first surface has a groove.

[0008] Therefore, by stamping a groove on the first surface, it not only acts as a material flow guide channel, but also cooperates with the stamping head to limit the movement, reducing the probability of the second part shifting during the stamping process, making the final bending angle of the bent part fuller, and improving the processing accuracy.

[0009] In some embodiments, the second portion includes a first surface and a second surface disposed opposite to each other along the thickness direction of the first wall, the first surface being disposed toward the interior of the housing, and the second portion being further away from the interior of the housing than the first portion; wherein the second surface has a groove.

[0010] Therefore, by stamping a groove on the second surface, while stamping the bent part and the second part, the groove can also serve as a material flow guide, making the bent part fuller, and the bending angle of the bent part meets the production requirements, thereby improving the processing accuracy.

[0011] In some embodiments, in the direction from the first part to the second part, the distance between the groove and the bend on the first surface and / or the second surface and the corner where the second part connects is in the range of 0.5 mm to 5 mm.

[0012] This allows the groove to better serve as a material flow channel guide, enabling the bending section to bend according to preset requirements, resulting in a fuller bending angle and meeting production needs.

[0013] In some embodiments, the distance between the groove and the bend on the first and / or second surfaces where they connect to the second portion in the direction from the first portion to the second portion ranges from 1 mm to 3 mm. Furthermore, this range can further improve the guiding effect of the groove on the material without affecting the bending process of the bend.

[0014] In some embodiments, the groove is provided at the corner where the bend connects to the second portion, and the groove is located on the same side of the surface as the first surface.

[0015] Thus, during the stamping process to form the bent section, the groove can provide bending space, allowing the bent section to bend smoothly along the position of the groove, forming a bent section that meets production requirements.

[0016] In some embodiments, the first portion has a groove at the corner where it connects to the bend, and the groove is located on the same side of the second surface.

[0017] Therefore, by forming a groove at the corner where the bent part connects to the first part, the groove can provide bending space during the stamping process of forming the bent part, so that the bent part can bend smoothly along the position of the groove to form a bent part that meets the production requirements.

[0018] In some embodiments, the thickness of the first wall is t, and the depth of the groove is greater than or equal to 0.05 mm and less than or equal to 0.5t.

[0019] Therefore, setting the depth of the groove within the above range can improve the overall strength of the first wall structure on the one hand, and effectively reduce the operational difficulty and processing accuracy during the stamping process on the other hand.

[0020] In some embodiments, the depth of the groove is less than or equal to 0.4t. This further improves the overall structural strength of the first wall, while simultaneously reducing the operational difficulty and machining accuracy during the stamping process.

[0021] In some embodiments, the Vickers hardness of the material of the first wall is greater than or equal to 50 HV; and / or, the tensile strength of the material of the first wall is greater than or equal to 125 MPa.

[0022] When the Vickers hardness and tensile strength of the first wall are set within the above range, the bent part and the second part can be successfully formed by stamping a groove.

[0023] In some embodiments, the first wall is configured as a top cover, on which an injection port is provided. A second portion is located on the outer periphery of the injection port, and a bent portion is connected to the side of the second portion opposite to the injection port. The second portion includes a first surface and a second surface disposed opposite to each other along the thickness direction of the first wall. The first surface is disposed away from the interior of the housing, and the second portion is closer to the interior of the housing than the first portion.

[0024] The above structure allows the groove to make the bend fuller and the bending angle smaller, which facilitates welding with the sealing nail, reduces the welding gap, and improves the welding yield.

[0025] In some embodiments, the battery cell further includes a seal for sealing the liquid injection port, the seal being welded to the first portion and forming a welding point; wherein, in the thickness direction of the top cover, a groove located at the corner of the end where the first portion connects to the bent portion is provided corresponding to the welding point.

[0026] In this way, the groove can better achieve the stamping and bending of the bent part on the top cover without affecting the welding between the seal and the top cover, making the bent part fuller.

[0027] In some embodiments, the grooves are continuously surrounding the outer periphery of the injection port; and / or, the grooves include a plurality of grooves and are spaced apart circumferentially along the injection port.

[0028] The above structure allows the grooves to be evenly distributed around the injection port, which can further improve the uniformity of extrusion during the stamping process.

[0029] In some embodiments, the first wall is configured as a top cover, the top cover having an electrode post hole for mounting an electrode post, a bend being formed on at least one side of the electrode post hole, the electrode post hole being located in the second portion.

[0030] With the above structure, the groove allows at least one side of the pole hole to be smoothly punched to form a bent part, and the second part where the pole hole is located is set down to facilitate better installation of the pole.

[0031] In some embodiments, the first wall is configured as a top cover, the top cover having a pole hole for mounting a pole, a bent portion surrounding the outer periphery of the pole hole, and the pole hole being located in the second portion.

[0032] By setting grooves, the top cover can smoothly form a bent part on the outer periphery of each pole hole, which can effectively improve the processing accuracy during the stamping process.

[0033] In some embodiments, the first wall is configured as a top cover, and the bent portion and the second portion together form a positioning post, the positioning post being provided to protrude in a direction away from the interior of the housing; wherein, a groove is formed on the top surface of the positioning post.

[0034] With the above structure, the groove can serve as a material flow channel guide, guiding the material at the upper end of the positioning post to flow towards the outer wall of the positioning post when it is squeezed, so that the outer wall size of the positioning post can remain consistent from top to bottom, and can better achieve the positioning and fit of structures such as upper plastic.

[0035] In some embodiments, the centerline of the groove coincides with the centerline of the positioning post. This structure facilitates more uniform material flow to the outer wall of the positioning post during the stamping process, further improving processing accuracy.

[0036] In some embodiments, the depth of the groove is less than the protrusion height of the positioning post along the thickness direction of the top cover.

[0037] The above structure can effectively improve the balance of the upper and lower dimensions of the outer wall of the positioning post while taking into account the overall strength of the positioning post, so that the positioning post can better achieve its positioning function.

[0038] In some embodiments, the width of the positioning post is d along the direction intersecting with the thickness direction of the top cover, and the width of the groove is greater than or equal to 0.05 mm and less than or equal to 0.9d.

[0039] The width of the groove is set within the above range, which can take into account the overall strength of the top cover while making the upper and lower dimensions of the outer wall of the positioning post more consistent and improving the feasibility of processing.

[0040] In some embodiments, the width of the groove is less than or equal to 0.8d. This allows for improved dimensional consistency of the outer wall of the positioning post while maintaining the overall strength of the top cover, and also enhances manufacturing feasibility.

[0041] In some embodiments, the grooves on the top surface of the positioning post include multiple grooves. With the above structure, when multiple grooves are set on the top surface of the positioning post, the actual extrusion effect during stamping can be controlled by adjusting the actual shape, actual position, and actual number of the grooves, thereby adjusting the final formed structure of the positioning post.

[0042] In some embodiments, the outer casing is made of steel, pure titanium, or titanium alloy.

[0043] Secondly, this application also provides a battery device, including the battery cell as described above.

[0044] Thirdly, this application also provides an electrical device, including the battery device as described above.

[0045] When the aforementioned battery cell, battery device, and electrical equipment are stamped on the first wall, grooves can be formed simultaneously. The grooves can act as material flow guides, guiding the material of the first wall to flow in a preset direction during extrusion, making processing more convenient and improving processing accuracy, so that the final stamped shell can meet production requirements. Attached Figure Description

[0046] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments.

[0047] Figure 2 This is an exploded structural diagram of a battery according to one or more embodiments.

[0048] Figure 3 This is an exploded structural diagram of a battery cell according to one or more embodiments.

[0049] Figure 4 This is a schematic diagram of the overall structure of a battery cell according to one or more embodiments.

[0050] Figure 5 This is a schematic diagram of the top cover in a battery cell according to one or more embodiments.

[0051] Figure 6 for Figure 5 Sectional view along the AA direction.

[0052] Figure 7 for Figure 6 A magnified view of a section at point B.

[0053] Figure 8 This is a schematic diagram of the top cover in a battery cell according to one or more embodiments.

[0054] Figure 9 for Figure 8 Sectional view along the CC direction.

[0055] Figure 10 for Figure 9 A magnified view of a section at point D.

[0056] Figure 11 This is a schematic diagram of the current positioning post structure formed by stamping.

[0057] Figure 12 for Figure 6 A magnified view of a section at point B.

[0058] Figure 13 for Figure 6 A magnified view of a section at point B.

[0059] Figure 14 This is a schematic diagram of the top cover in a battery cell according to one or more embodiments.

[0060] Figure 15 This is a cross-sectional view of the top cover in a battery cell according to one or more embodiments.

[0061] Figure 16 for Figure 15 A magnified view of a section at point E in the middle.

[0062] Figure 17 This is a schematic diagram of the top cover in a battery cell according to one or more embodiments.

[0063] Figure 18 This is a cross-sectional view of the top cover in a battery cell according to one or more embodiments.

[0064] Figure 19 for Figure 18 A magnified view of a section at point F.

[0065] Figure 20 for Figure 9 A magnified view of a section at point D.

[0066] Figure 21 for Figure 9 A magnified view of a section at point D.

[0067] Figure 22 This is a cross-sectional view of a positioning post in a battery cell according to one or more embodiments.

[0068] Explanation of reference numerals in the attached drawings: 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, housing; 20, battery cell; 11, first part; 12, second part; 21, top cover; 22, housing; 23, electrode assembly; 24, first wall; 25, sealing pin; 241, first part; 242, bend; 243, second part; 244, first surface; 245, second surface; 246, groove; 247, liquid inlet; 248, electrode hole; 249, positioning post; a, thickness direction. Detailed Implementation

[0069] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0070] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0071] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0072] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0073] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0074] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0075] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0076] A battery device consists of one or more battery cells. For each battery device, the multiple battery cells that make up it can be connected in series, in parallel, or in a mixed configuration. Among them, a mixed configuration means that multiple battery cells are connected in both series and parallel.

[0077] A battery cell is the smallest unit that makes up a battery. The structure of a battery cell typically includes a casing and an electrode assembly housed inside the casing. The casing forms a closed, sealed cavity that houses and protects the electrode assembly. The electrode assembly is the component within the battery cell where electrochemical reactions occur, and typically includes a positive electrode, a negative electrode, and a separator, which are stacked or wound together.

[0078] With the rapid development of new energy technologies, the performance requirements for battery cells are becoming increasingly stringent. In addition to high energy density, battery cells are also required to be lighter to facilitate use.

[0079] To meet the demand for high energy density, the structure of battery cells has become more compact. As a result, when the battery cells expand and deform during cyclic charging and discharging, the welds of the outer casing are prone to fatigue cracking, leading to leakage of the battery cells.

[0080] Based on this, steel shells with greater hardness have been introduced into current production as the outer shell of battery cells. However, although steel shells solve the problem of cracking and leakage, they are heavy and cannot meet the requirements for lightweighting.

[0081] Therefore, there is a need to provide a material with high yield strength, high hardness, and lighter weight as the casing material for battery cells.

[0082] However, during the manufacturing process of battery cells, the casing needs to undergo stamping and other processing operations to create specific structures such as bends, indentations, or protrusions. For example, to create a liquid injection port on the casing, a certain recess needs to be made at the injection port location to allow for the sealing pin to be welded to the injection port. Furthermore, during the assembly of battery cells, certain positioning structures need to be protruded on the casing to facilitate assembly and positioning.

[0083] Under such circumstances, shell materials with high yield strength and high hardness have poor processing performance and material flowability, which makes it difficult to operate during stamping and the processing accuracy cannot meet the production requirements.

[0084] Based on the above considerations, in order to solve the problems of high processing difficulty and low processing accuracy of the current battery cell casing, one or more embodiments of this application provide a battery cell in which a groove can be formed simultaneously during the stamping operation of the first wall of the battery cell casing. The groove can act as a material flow guide, guiding the material of the first wall to flow in a preset direction during extrusion, which makes processing more convenient and improves processing accuracy, so that the final stamped casing can meet production requirements.

[0085] It should be noted that the battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0086] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0087] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0088] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0089] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0090] The battery devices disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft.

[0091] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0092] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0093] Please refer to Figure 1The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0094] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0095] Please refer to Figure 2 The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, collectively defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 together define the space. Alternatively, both the first portion 11 and the second portion 12 may be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0096] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0097] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0098] Please refer to Figure 3 A battery cell 20 refers to the smallest unit that makes up a battery. A battery cell 20 typically includes a casing, electrode assembly 23, and other functional components. The casing typically consists of a top cover 21 and a housing 22. The top cover 21 is a component that closes onto the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the top cover 21 can be adapted to the shape of the housing 22 to fit the housing 22. Functional components such as electrode terminals, also known as terminals, can be provided on the top cover 21. The electrode terminals can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy into the battery cell 20. In some embodiments, the top cover 21 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. In some embodiments, an insulating member may also be provided inside the top cover 21. The insulating member can be used to isolate the electrical connection components within the housing 22 from the top cover 21 to reduce the risk of short circuits. Exemplarily, the insulating member can be made of plastic, rubber, etc.

[0099] The housing 22 is a component used to cooperate with the top cover 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the top cover 21 can be independent components. An opening can be provided on the housing 22, and the top cover 21 closes the opening to form the internal environment of the battery cell 20. Alternatively, the top cover 21 and the housing 22 can be integrated. Specifically, the top cover 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the top cover 21 closes the housing 22. The housing 22 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23.

[0100] Electrode assembly 23 is the component in the battery cell 20 where electrochemical reactions occur. The casing 22 may contain one or more electrode assemblies 23. Electrode assembly 23 mainly consists of a positive electrode, a separator, and a negative electrode. Specifically, positive and negative active materials are coated onto the current collector to form the positive and negative electrode, respectively. The positive and negative electrode are wound or stacked, with the separator positioned between them, thus forming electrode assembly 23. The portions of the positive and negative electrode with active material constitute the main body of electrode assembly 23, while the portions without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends. During charging and discharging, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0101] See Figure 4 , Figure 5 , Figure 6 as well as Figure 7 One embodiment of this application provides a battery cell 20, including a casing and an electrode assembly 23. The casing includes a first wall 24, which includes a first portion 241, a bent portion 242, and a second portion 243. The second portion 243 is closer to or further from the interior of the casing than the first portion 241. The bent portion 242 connects the first portion 241 and the second portion 243. The electrode assembly 23 is disposed inside the casing. The yield strength of the material of the first wall 24 is greater than or equal to 115 MPa and less than or equal to 500 MPa. A groove 246 is provided at one end of the first portion 241 near the bent portion 242, and / or, a groove 246 is provided on the bent portion 242, and / or, a groove 246 is provided at one end of the second portion 243 near the bent portion 242.

[0102] It should be noted that the outer shell refers to the structure that encloses and forms a cavity for housing the electrode assembly 23 and provides protection for the electrode assembly 23. The outer shell can be assembled from the top cover 21 and the housing 22, or it can be integrally formed.

[0103] The first wall 24 refers to the part of the outer shell formed by stamping. For example, if stamping is performed on one of the side walls of the outer shell, then that side wall is the first wall 24.

[0104] The first wall 24 includes a first portion 241 and a bent portion 242 and a second portion 243, both formed by stamping the first portion 241. Specifically, the first portion 241 is stamped, and after stamping, the bent portion 242 and the second portion 243 are formed on the first portion 241. The first portion 241 and the second portion 243 are respectively connected to opposite sides of the bent portion 242. During the stamping process of the first portion 241, the second portion 243 is recessed or protruded relative to the first portion 241, creating a height difference between them. This causes the second portion 243 to be closer to or further away from the interior of the outer casing than the first portion 241. The bent portion 242 connects the first portion 241 and the second portion 243, serving as a connection and transition.

[0105] Specifically, the stamped second portion 243 can be parallel to the first portion 241. When the first wall 24 is constructed as one of the sidewalls of the housing, the thickness direction a of the first wall 24 is the thickness direction a of that sidewall. Along the thickness direction a of the first wall 24, the second portion 243 includes a first surface 244 and a second surface 245 disposed opposite to each other, that is, one of the first surface 244 and the second surface 245 faces the interior of the housing and is configured as an inner surface, and the other faces away from the interior of the housing and is configured as an outer surface.

[0106] The yield strength of the material in the first wall 24 refers to the stress value corresponding to the yielding phenomenon of the material in the first wall 24. The yield strength of the material can be measured by tensile testing. Specifically, a tensile testing machine is used, and a prepared standard specimen is clamped on the machine. The specimen is usually of a specific shape and size, commonly circular or rectangular. After the tensile testing machine is started, the specimen will be subjected to a gradually increasing axial tensile force. In the initial stage of tension, the material undergoes elastic deformation, at which point the stress and strain have a linear relationship, following Hooke's law. As the tensile force continues to increase, when the material begins to exhibit significant plastic deformation, and the stress-strain curve no longer remains linear, it means that the material has reached the yield state. On the stress-strain curve, the stress value corresponding to the yielding stage is the yield strength.

[0107] In addition, the yield strength of a material can also be measured using instrumental testing methods, such as hardness testers and universal testing machines.

[0108] Furthermore, the groove 246 refers to a groove structure formed by stamping. While stamping the first part 241 to form the bent part 242 and the second part 243, the groove 246 can be formed simultaneously. The groove 246 can be located at the corner of the bent part 242, i.e., located on the bent part 242; the groove 246 can also be located at one end of the second part 243 near the bent part 242, i.e., the groove 246 can be located on one side of the first surface 244 and / or the second surface 245 near the bent part 242; in addition, the groove 246 can also be located at the end where the first part 241 connects to the bent part 242, for example, at the corner where the first part 241 connects to the bent part 242.

[0109] Here, it can be understood that the corner refers to the position where the bending part 242 actually bends, usually the position where the bending part 242 connects with the first part 241, or the position where the bending part 242 connects with the second part 243.

[0110] During the process of stamping the first part 241 to form the bent part 242 and the second part 243, the groove 246 can act as a material flow guide, guiding the material of the first wall 24 to flow in a preset direction during extrusion, thereby smoothly forming the bent part 242 and the second part 243, and ensuring that the structure of the bent part 242 and the second part 243 meets the requirements of processing accuracy.

[0111] A groove 246 is stamped into the bent portion 242, typically at the corner of the bent portion 242. This allows the bent portion 242 to bend more smoothly, resulting in a fuller bending angle that meets production requirements. Alternatively, a groove 246 can be stamped at the end of the first part 241 connected to the bent portion 242, and / or at the end of the second part 243 near the bent portion 242. This allows the groove 246 to act as a material flow guide, further enhancing the fullness of the final bent portion 242 and improving processing accuracy.

[0112] Understandably, in specific applications, the groove 246 can be formed only at the corner of the bent portion 242, or only at the end where the first part 241 connects to the bent portion 242, or only at the end of the second part 243 near the bent portion 242. Alternatively, the groove 246 can be formed simultaneously at any two or three of the following locations: the corner of the bent portion 242, the end where the first part 241 connects to the bent portion 242, and the end of the second part 243 near the bent portion 242. All of these embodiments can reduce the operational difficulty of stamping and improve processing accuracy, and will not be elaborated upon further here.

[0113] With the above structure, when the first wall 24 of the outer shell of the battery cell 20 is stamped, the groove 246 can be formed simultaneously. The groove 246 can act as a material flow guide, guiding the material of the first wall 24 to flow in a preset direction during extrusion, which makes it easier to process and improves the processing accuracy, so that the final stamped shell can meet the production requirements.

[0114] like Figure 7 As shown, in some embodiments, the second portion 243 includes a first surface 244 and a second surface 245 disposed opposite to each other along the thickness direction a of the first wall 24. The first surface 244 is disposed away from the interior of the housing, and the second portion 243 is closer to the interior of the housing than the first portion 241. The first surface 244 has a groove 246.

[0115] Specifically, the first surface 244 is stamped to form a bent portion 242 and a second portion 243 on the first portion 241, with the second portion 243 being closer to the interior of the outer shell than the first portion 241. In this case, the first surface 244 is a stamping surface, which refers to the side of the surface that contacts the stamping head during the stamping process. That is, the stamping head abuts against the first surface 244 and stamps the first surface 244 to smoothly form the second portion 243.

[0116] It should be noted that the outer casing typically has an injection port 247, through which electrolyte can be filled into the casing. After the electrolyte filling is completed, the injection port 247 needs to be sealed with a sealing pin 25. Therefore, a countersunk portion consisting of a bent portion 242 and a second portion 243 needs to be stamped around the outer periphery of the injection port 247. The countersunk portion can accommodate at least part of the sealing pin 25, reducing the space occupied by the sealing pin 25 in the thickness direction a after it is sealed and welded to the injection port 247.

[0117] However, if the bending angle of the bent part 242 is too large during stamping, exceeding the design limit, it will cause the welding gap between the sealing nail 25 and the first wall 24 to increase, resulting in a false weld on the sealing nail 25.

[0118] Based on this, a groove 246 is formed by stamping on the stamping surface. Correspondingly, a protrusion matching the groove 246 can be provided on the stamping head. That is, during the stamping process, when the stamping head abuts against the stamping surface, the protrusion engages within the groove 246. In this way, the groove 246 and the protrusion can achieve a limiting effect, reducing the probability of the second part 243 shifting during the stamping process, resulting in a fuller and smaller bending angle for the bent part 242. This makes the welding between the sealing nail 25 and the first wall 24 more stable, reduces the welding gap, and improves the welding yield.

[0119] Therefore, by stamping a groove 246 on the first surface 244, it can not only act as a material flow guide channel, but also cooperate with the stamping head to limit the movement, reducing the probability of the second part 243 deviating during the stamping process, making the final bending angle of the bent part 242 fuller and improving the processing accuracy.

[0120] like Figure 8 , Figure 9 as well as Figure 10 As shown, in some embodiments, the second portion 243 includes a first surface 244 and a second surface 245 disposed opposite to each other along the thickness direction a of the first wall 24, the first surface 244 being disposed toward the interior of the housing, and the second portion 243 being further away from the interior of the housing than the first portion 241; wherein, the second surface 245 has a groove.

[0121] Specifically, the first surface 244 is stamped to form a bent portion 242 and a second portion 243 on the first portion 241, with the second portion 243 being further away from the interior of the outer casing than the first portion 241. In this case, the first surface 244 is the stamping surface, and the second surface 245 is the opposite surface of the stamping surface. When the stamping head abuts against the first surface 244, a groove 246 can be simultaneously stamped on the second surface 245 opposite to the first surface 244.

[0122] like Figure 11 As shown, it should be noted that during the assembly of the battery cell 20, some positioning structures are needed to make the assembly more precise. For example, positioning posts 249 are usually stamped on the outer periphery of the terminal post, and the positioning posts 249 are used to position the plastic and other structures.

[0123] However, due to the poor flowability of the outer shell material, the outer wall dimensions of the positioning post 249 cannot be kept consistent during stamping; that is, the top of the positioning post 249 has an arc-shaped edge. As a result, when the positioning post 249 is positioned and mated with the upper plastic, the upper plastic is prone to twisting, making the positioning unreliable.

[0124] Based on this, while stamping the first wall 24 to form the bent portion 242 and the second portion 243, a groove 246 is stamped on the second surface 245. Thus, during the stamping process of forming the positioning post 249, the groove 246 acts as a material flow guide, directing the material at the upper end of the positioning post 249 to flow towards the outer wall of the positioning post 249 when compressed, thereby appropriately supplementing the upper diameter. This ensures that the outer wall dimensions of the positioning post 249 remain consistent vertically, enabling more reliable positioning of structures such as plastic parts.

[0125] Therefore, by stamping a groove 246 on the second surface 245, while stamping the bent portion 242 and the second part 243, the groove 246 can serve as a material flow guide, making the bent portion 242 fuller, and the bending angle of the bent portion 242 meets the production requirements, thereby improving the processing accuracy.

[0126] In some embodiments, in the direction from the first portion 241 to the second portion 243, the distance between the groove 246 and the bend 242 on the first surface 244 and / or the second surface 245 and the corner where they connect to the second portion 243 is in the range of 0.5mm to 5mm.

[0127] Specifically, if the groove 246 is too close to or too far from the bend 242, it will be difficult to improve the bending angle of the bend 242.

[0128] Therefore, by setting the distance between the groove 246 and the bending portion 242 within the aforementioned range, the groove 246 can better serve as a material flow channel guide, and the bending portion 242 can be bent according to the preset requirements, with a fuller bending angle to meet production needs.

[0129] Furthermore, in the direction from the first portion 241 to the second portion 243, the distance between the groove 246 on the first surface 244 and / or the second surface 245 and the corner where the bend 242 connects to the second portion 243 ranges from 1mm to 3mm. Furthermore, this range can further improve the guiding effect of the groove 246 on the material without affecting the bending process of the bend 242.

[0130] Please refer to the following: Figure 12 and Figure 13 In some embodiments, the groove 246 is provided at the corner where the bend 242 connects to the second part 243, and the groove 246 is located on the same side of the surface as the first surface 244.

[0131] Specifically, the two opposite ends of the bent portion 242 are connected to the second portion 243 and the first portion 241, respectively, and the connection position forms a corner. Among them, a groove 246 is stamped at the corner where the bent portion 242 connects to the second portion 243, and the groove 246 is located on the same side of the surface as the first surface 244.

[0132] Thus, during the stamping process to form the bent portion 242, the groove 246 can provide bending space, allowing the bent portion 242 to bend smoothly along the position of the groove 246, forming a bent portion 242 that meets production requirements.

[0133] Understandably, when a groove 246 is formed by stamping on the first surface 244, the groove 246 can also be formed at the corner where the bent portion 242 connects to the second portion 243. Similarly, when a groove 246 is formed by stamping on the second surface 245, the groove 246 can also be formed at the corner where the bent portion 242 connects to the second portion 243. The grooves 246 can cooperate with each other to achieve the purpose of smoothly forming the bent portion 242 that meets production requirements.

[0134] In some embodiments, a groove 246 is provided at the corner where the first portion 241 connects to the bend 242, and the groove 246 is located on the same side of the surface as the second surface 245.

[0135] Specifically, a groove 246 is punched at the corner where the first part 241 connects to the bent part 242. Similarly, the groove 246 can provide bending space for the bent part 242, so that the bent part 242 can be bent smoothly along the position of the groove 246 to form a bent part 242 that meets the production requirements.

[0136] Understandably, grooves 246 can be simultaneously punched at the corners where the bent portion 242 connects to the first portion 241 and at the corners where the bent portion 242 connects to the second portion 243. The grooves 246 can cooperate with each other to make the bent portion 242 bend better along the grooves 246, so that the final bending angle of the bent portion 242 meets the production requirements.

[0137] Of course, the groove 246 at the corner can also exist simultaneously with the groove 246 on the first surface 244 and the second surface 245. The grooves 246 can cooperate with each other to make the stamping process smoother, reduce the difficulty of operation, and improve the processing accuracy.

[0138] Therefore, by forming a groove 246 at the corner where the bent portion 242 connects to the first portion 241, the groove 246 can provide bending space during the stamping process of forming the bent portion 242, so that the bent portion 242 can be bent smoothly along the position of the groove 246, forming a bent portion 242 that meets the production requirements.

[0139] like Figure 7 As shown, in some embodiments, the thickness of the first wall 24 is t, and the depth of the groove 246 is greater than or equal to 0.05 mm and less than or equal to 0.5t.

[0140] Specifically, the groove 246 is formed by stamping on the first wall 24, that is, the groove 246 is formed by stamping on the surface of the bent portion 242 or the second portion 243.

[0141] The greater the depth of the groove 246, the smaller the residual thickness of the first wall 24 at the groove 246 position; conversely, the smaller the depth of the groove 246, the greater the residual thickness of the first wall 24 at the groove 246 position.

[0142] Therefore, the depth of the groove 246 will affect the overall strength of the first wall 24, as well as the operational difficulty and processing accuracy when stamping to form the bent part 242.

[0143] Therefore, setting the depth of the groove 246 within the above-mentioned range can, on the one hand, improve the overall structural strength of the first wall 24, and on the other hand, effectively reduce the operational difficulty and processing accuracy during the stamping process.

[0144] As a specific embodiment, the depth of the groove 246 can be set to be greater than or equal to 0.05 mm and less than or equal to 0.4 t. This further improves the overall structural strength of the first wall 24, while also effectively reducing the operational difficulty and machining accuracy during the stamping process.

[0145] In some embodiments, the Vickers hardness of the material of the first wall 24 is greater than or equal to 50 HV. And / or, the tensile strength of the material of the first wall 24 is greater than or equal to 125 MPa.

[0146] Specifically, Vickers hardness is an important indicator for measuring a material's resistance to plastic deformation. It is calculated by applying a test force to the material surface with a specific indenter and then calculating the hardness value based on the indentation area, thus reflecting the material's degree of hardness. The Vickers hardness of the material in the first wall 24 can be measured using a Vickers hardness tester.

[0147] The tensile strength of the material in the first wall 24 refers to the maximum ability of a material to resist fracture under tensile load. It is expressed as the force per unit area (e.g., MPa). Tensile strength reflects the maximum stress value that a material can withstand during tension and is one of the important indicators for measuring the mechanical properties of materials.

[0148] Tensile strength can be measured through a tensile test. First, the material to be tested is processed into a standard specimen according to relevant standards. The specimen is then mounted on a tensile testing machine, which applies a tensile force to the specimen at a constant rate. During the tensile process, as the tensile force gradually increases, the specimen sequentially undergoes elastic deformation, yielding, and strengthening stages until it finally fractures. Throughout this process, the testing machine simultaneously records the tensile force and the elongation of the specimen, and plots a stress-strain curve. When the specimen fractures, the maximum tensile force read from the testing machine, divided by the original cross-sectional area of ​​the specimen, yields the tensile strength of the material.

[0149] The yield strength, Vickers hardness, and tensile strength of the material of the first wall 24 will affect the difficulty of the stamping operation, thereby indirectly affecting the final processing accuracy. Therefore, when the yield strength, Vickers hardness, and tensile strength of the material of the first wall 24 are set within the above range, the bent part 242 and the second part 243 can be successfully stamped by forming the groove 246.

[0150] Furthermore, as a specific embodiment, the material of the first wall 24 can be, but is not limited to, pure titanium or titanium alloy. This not only improves the energy density of the battery cell 20 but also achieves the requirement for lightweighting the battery cell 20.

[0151] like Figure 5 and Figure 12 As shown, in some embodiments, the first wall 24 is configured as a top cover 21, on which an injection port 247 is provided. A second portion 243 is located on the outer periphery of the injection port 247, and a bent portion 242 is connected to the side of the second portion 243 facing away from the injection port 247. The second portion 243 includes a first surface 244 and a second surface 245 disposed opposite to each other along the thickness direction a of the first wall 24. The first surface 244 is disposed away from the interior of the outer casing, and the second portion 243 is closer to the interior of the outer casing than the first portion 241.

[0152] Specifically, the outer casing includes a housing 22 and a top cover 21 that is sealed at the opening of the housing 22. The housing 22 and the top cover 21 together enclose a cavity for accommodating the electrode assembly 23. An injection port 247 is provided on the top cover 21, through which electrolyte can be filled into the cavity.

[0153] After the liquid injection is completed, the sealing nail 25 needs to be welded to the liquid injection port 247 to seal the liquid injection port 247, so that the inside of the battery cell 20 is sealed.

[0154] To better accommodate the sealing pin 25, the top cover 21 is usually stamped, forming a bent portion 242 and a second portion 243 on the outer periphery of the injection port 247. The second portion 243 is formed on the outer periphery of the injection port 247, and the bent portion 242 connects the second portion 243 and the first portion 241.

[0155] Understandably, when the bend 242 and the second portion 243 are formed on the outer periphery of the injection port 247, the second portion 243 is recessed downward relative to the first portion 241 to accommodate the sealing pin 25. Simultaneously, a groove 246 can be formed by stamping on the first surface 244, at the corner where the bend 242 connects to the first portion 241, or at the corner where the bend 242 connects to the second portion 243. Alternatively, the groove 246 can be formed by stamping on any two or three of the following simultaneously: the first surface 244, the corner where the bend 242 connects to the first portion 241, and the corner where the bend 242 connects to the second portion 243.

[0156] In addition, the groove 246 can be a groove structure with a smooth transition, or it can be a groove structure such as a square or multi-layered steps.

[0157] With the above structure, the groove 246 makes the bent portion 242 fuller and the bending angle of the bent portion 242 smaller, so as to facilitate welding with the sealing nail 25, reduce the welding gap, and improve the welding efficiency.

[0158] In some embodiments, the battery cell 20 further includes a seal for sealing the liquid injection port 247, the seal being welded to the first portion 241 and forming a weld point. Specifically, in the thickness direction of the top cover, a groove 246 located at the corner where the first portion 241 connects to the bend 242 is correspondingly provided to the weld point.

[0159] Specifically, the sealing element can be configured as a sealing pin 25, which is welded to the top cover to seal the injection port 247.

[0160] With the above structure, the groove 246 can better realize the stamping and bending of the bent part 242 on the top cover without affecting the welding between the seal and the top cover, making the bent part 242 fuller.

[0161] In some embodiments, the grooves 246 are continuously disposed around the outer periphery of the injection port 247. And / or, the grooves 246 include a plurality of grooves and are disposed at intervals along the circumferential direction of the injection port 247.

[0162] Specifically, the grooves 246 can be continuously distributed around the outer periphery of the injection port 247, or multiple grooves 246 can be set, and all grooves 246 can be evenly spaced along the outer periphery of the injection port 247.

[0163] With the above structure, the grooves 246 are evenly distributed on the outer periphery of the injection port 247, which can further improve the uniformity of extrusion during the stamping process.

[0164] Please refer to the following: Figure 14 , Figure 15 as well as Figure 16 In some embodiments, the first wall 24 is configured as a top cover 21, on which a pole hole 248 for mounting a pole is provided, and a bend 242 is formed on at least one side of the pole hole 248, the pole hole 248 being located in the second portion 243.

[0165] Specifically, a terminal hole 248 is made on the top cover 21. During the assembly process, the terminal can be passed through the terminal hole 248 to facilitate electrical connection between the terminal and the external structure, thereby realizing the power output and input of the battery cell 20.

[0166] Typically, two electrode holes 248 are provided to accommodate the positive electrode and the negative electrode, respectively. A bent portion 242 and a second portion 243 are formed by stamping on the side of the positive electrode facing away from the negative electrode, and on the side of the negative electrode facing away from the positive electrode, respectively. This creates a sunken structure in the area where the electrode holes 248 of the positive electrode and the negative electrode are located, which can better improve the space utilization in the height direction.

[0167] With the above structure, the groove 246 is used to smoothly punch at least one side of the pole hole 248 to form a bent part 242 and a second part 243, and the area where the pole hole 248 is located is lowered to facilitate better installation of the pole.

[0168] Please refer to the following: Figure 17 , Figure 18 as well as Figure 19 In some embodiments, the first wall 24 is configured as a top cover 21, on which a pole hole 248 for mounting a pole is provided, and a bent portion 242 surrounds the outer periphery of the pole hole 248, the pole hole 248 being located in the second portion 243.

[0169] Specifically, a bend 242 is formed on the outer periphery of each pole hole 248, and the pole hole 248 is located on the corresponding second part 243, which is recessed relative to the first part 241.

[0170] In this process, a groove 246 is formed by stamping on the first surface 244 of the second part 243, and grooves 246 are also formed at the corners where the bent part 242 connects to the first part 241 and at the corners where the bent part 242 connects to the second part 243.

[0171] By setting the groove 246, the top cover 21 can smoothly form a bent part 242 and a second part 243 on the outer periphery of each pole hole 248, which can effectively improve the processing accuracy during the stamping process.

[0172] Please refer to it again. Figure 8 , Figure 9 as well as Figure 10 In some embodiments, the first wall 24 is configured as a top cover 21, and the bent portion 242 and the second portion 243 together form a positioning post 249, which protrudes in a direction away from the interior of the outer casing. A groove 246 is formed on the top surface of the positioning post 249.

[0173] Specifically, the side of the top cover 21 facing the inside of the receiving cavity is the inner surface, and the side of the top cover 21 facing away from the receiving cavity is the outer surface. A positioning post 249 is formed by stamping from the inner surface of the top cover 21 to the outer surface. During the assembly of the battery cell 20, the positioning post 249 can be used to position the plastic or other structures, thereby improving the assembly accuracy.

[0174] The bottom surface of the positioning post 249 faces the inside of the receiving cavity, which is the first surface 244. The top surface of the positioning post 249 is opposite to the bottom surface, which is the second surface 245.

[0175] A groove 246 is stamped into the top surface of the positioning post 249, with the concave direction of the groove 246 opposite to the convex direction of the positioning post 249. Thus, during the stamping process of the positioning post 249, a reverse stamping operation is simultaneously performed on the top surface of the positioning post 249 to form the groove 246. In this way, the groove 246 can serve as a material flow channel, guiding the material at the upper end of the positioning post 249 to flow towards the outer wall of the positioning post 249 when compressed, allowing the extension direction of the outer wall of the positioning post 249 to be parallel to the thickness direction a of the top cover 21. In other words, the dimensions of the outer wall of the positioning post 249 can remain consistent vertically, enabling better positioning and fit with structures such as upper plastic parts.

[0176] Meanwhile, grooves 246 can also be punched at the corners of the positioning post 249, that is, at the corners where the bent portion 242 connects to the first portion 241 and the corners where the bent portion 242 connects to the second portion 243, which can further improve the machining accuracy of the positioning post 249.

[0177] With the above structure, the groove 246 can serve as a material flow channel guide, guiding the material at the upper end of the positioning post 249 to flow to the outer wall of the positioning post 249 when it is squeezed, so that the outer wall size of the positioning post 249 can be kept consistent from top to bottom, and can better achieve the positioning and fit of the upper plastic and other structures.

[0178] It should be noted that the range of the yield strength of the material of the top cover 21 will affect the molding effect of the positioning post 249. Specifically, the longer the straight segment of the outer wall of the positioning post 249, that is, the better the consistency of the upper and lower dimensions of the outer wall, the better the molding effect of the positioning post 249.

[0179] In addition, the depth and diameter of the groove 246 also affect the forming effect of the positioning post 249, as shown in the table below.

[0180]

[0181] In the table above, when the straight segment length of the outer wall of the positioning post 249 is greater than or equal to 0.4 mm, the positioning post 249 can effectively improve the problem of rotation of the upper plastic or other structures when it is inserted and mated with the upper plastic or other structures. In other words, when the straight segment length of the outer wall of the positioning post 249 is greater than or equal to 0.4 mm, the test result is considered qualified.

[0182] Therefore, as shown in the table above, if the yield strength of the material of the top cover 21 is between 115 MPa and 500 MPa, then the test result is qualified.

[0183] In some embodiments, the center line of the groove 246 coincides with the center line of the positioning post 249.

[0184] like Figure 10 , Figure 20 as well as Figure 21 As shown, specifically, the shape of the groove 246 on the top surface of the positioning post 249 can be, but is not limited to, a semi-circular shape, a semi-elliptical shape, a trapezoidal shape, or a rectangle.

[0185] Furthermore, the center line of the groove 246 coincides with the center line of the positioning post 249, that is, the center of the groove 246 and the positioning post 249 are concentrically set.

[0186] With the above structure, during the stamping process, it is more conducive to the material flowing evenly to the outer wall of the positioning post 249, thereby further improving the processing accuracy.

[0187] In some embodiments, along the thickness direction a of the top cover 21, the depth H1 of the groove 246 is less than the protrusion height H2 of the positioning post 249.

[0188] Specifically, the depth of the groove 246 not only affects the overall structural strength of the positioning post 249, but also affects the balance of the upper and lower dimensions of the outer wall of the positioning post 249.

[0189] Therefore, through the above structure, while taking into account the overall structural strength of the positioning post 249, the balance of the upper and lower dimensions of the outer side wall of the positioning post 249 can be effectively improved, so that the positioning post 249 can better achieve the positioning function.

[0190] In some embodiments, the width of the positioning post 249 is d along the direction intersecting with the thickness direction a of the top cover 21, and the width of the groove 246 is greater than or equal to 0.05 mm and less than or equal to 0.9d.

[0191] Specifically, the direction intersecting with the thickness direction a of the top cover 21 can be a direction perpendicular to the thickness direction a of the top cover 21, that is, the length direction or the width direction of the top cover 21.

[0192] The width of the groove 246 is set within the above range, which can take into account the overall strength of the top cover 21 while making the upper and lower dimensions of the outer side wall of the positioning post 249 more consistent and improving the feasibility of processing.

[0193] In one specific embodiment, the width of the groove 246 is greater than or equal to 0.05 mm and less than or equal to 0.8d. This allows for improved dimensional consistency of the outer side wall of the positioning post 249 while maintaining the overall strength of the top cover 21, and also enhances manufacturing feasibility.

[0194] like Figure 22 As shown, in some embodiments, the groove 246 on the top surface of the positioning post 249 includes multiple grooves.

[0195] Specifically, the groove 246 on the top surface of the positioning post 249 can be one or more. When there are multiple grooves 246, they can be evenly distributed on the top surface of the positioning post 249.

[0196] Furthermore, the groove 246 on the top surface of the positioning post 249 can be configured as a single step or multiple steps. The specific shape and number of grooves 246 can be adjusted according to actual applications to adapt to different production needs, which will not be elaborated here.

[0197] With the above structure, when multiple grooves 246 are set on the top surface of the positioning post 249, the actual extrusion effect during stamping can be controlled by adjusting the actual shape, actual position and actual number of grooves 246, thereby adjusting the final structure of the positioning post 249.

[0198] In some embodiments, the outer casing is made of steel, pure titanium, or titanium alloy. Understandably, the outer casing can also be made of other materials with high rigidity and hardness, and can also be processed using the above structure to ensure that the stamping and bending positions meet production requirements.

[0199] Based on the same concept as the battery cell 20 described above, this application also provides a battery device 100, including the battery cell 20 as described above.

[0200] Based on the same concept as the battery device 100 described above, this application also provides an electrical device including the battery device 100 as described above.

[0201] In practical use, based on the actual structure stamped on the outer shell, corresponding grooves 246 are stamped on the first surface 244 and the second surface 245 of the corresponding bent portion 242 or the second part 243, so that the grooves 246 can guide the flow of material during the stamping process, thereby ensuring that the dimensions of the stamped bent portion 242 meet the production requirements, making the stamping process smoother and improving the processing accuracy.

[0202] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0203] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, characterized by, include: An outer casing includes a first wall; the first wall includes a first portion, a second portion, and a bend, wherein the second portion is closer to or farther from the interior of the outer casing than the first portion, and the bend connects the first portion and the second portion; and The electrode assembly is disposed inside the housing; Wherein, the yield strength of the material of the first wall is greater than or equal to 115 MPa and less than or equal to 500 MPa; a groove is provided at one end of the first part near the bending part, and / or a groove is provided on the bending part, and / or a groove is provided at one end of the second part near the bending part.

2. The battery cell of claim 1, wherein, The second part includes a first surface and a second surface disposed opposite to each other along the thickness direction of the first wall, the first surface being disposed away from the interior of the housing, and the second part being closer to the interior of the housing than the first part; wherein, the first surface has the groove.

3. The battery cell of claim 1, wherein, The second part includes a first surface and a second surface disposed opposite to each other along the thickness direction of the first wall, the first surface being disposed towards the interior of the housing, and the second part being further away from the interior of the housing than the first part; wherein the groove is provided on the second surface.

4. The battery cell according to claim 2 or 3, characterized in that, In the direction from the first part to the second part, the distance between the groove and the corner where the bend connects to the second part on the first surface and / or the second surface is in the range of 0.5mm to 5mm.

5. The battery cell of claim 4, wherein, In the direction from the first part to the second part, the distance between the groove and the corner where the bend connects to the second part on the first surface and / or the second surface is in the range of 1mm to 3mm.

6. The battery cell according to claim 2 or 3, characterized in that, The groove is located at the corner where the bent portion connects to the second portion, and the groove is located on the same side of the surface as the first surface.

7. The battery cell according to claim 2 or 3, characterized in that, The first part has the groove at the corner where it connects to the bent part, and the groove is located on the same side of the surface as the second surface.

8. The battery cell according to claim 1, characterized in that, The thickness of the first wall is t, and the depth of the groove is greater than or equal to 0.05 mm and less than or equal to 0.5t.

9. The battery cell of claim 8, wherein, The depth of the groove is less than or equal to 0.4t.

10. The battery cell of claim 1, wherein, The Vickers hardness of the material of the first wall is greater than or equal to 50 HV; and / or the tensile strength of the material of the first wall is greater than or equal to 125 MPa.

11. The battery cell of claim 1, wherein, The first wall is constructed as a top cover, and an injection port is provided on the top cover. The second part is located on the outer periphery of the injection port, and the bent part is connected to the side of the second part opposite to the injection port. The second part includes a first surface and a second surface disposed opposite to each other along the thickness direction of the first wall, the first surface being disposed away from the interior of the outer shell, and the second part being closer to the interior of the outer shell than the first part.

12. The battery cell of claim 11, wherein, The battery cell also includes a sealing element for sealing the liquid injection port, the sealing element being welded to the first part and forming a welding point; In the thickness direction of the top cover, the groove located at the corner where the first part connects to the bent part corresponds to the welding point.

13. The battery cell of claim 11, wherein, The grooves are continuously arranged around the outer periphery of the injection port; and / or, the grooves include multiple grooves and are spaced apart circumferentially along the injection port.

14. The battery cell of claim 1, wherein, The first wall is configured as a top cover, on which a pole hole for mounting a pole is provided, and the bend is formed on at least one side of the pole hole, the pole hole being located in the second portion.

15. The battery cell of claim 1, wherein, The first wall is constructed as a top cover, and the top cover has a pole hole for installing a pole post. The bent portion surrounds the outer periphery of the pole hole, and the pole hole is located in the second part.

16. The battery cell of claim 1, wherein, The first wall is constructed as a top cover, and the bent portion and the second portion together form a positioning post, which protrudes in a direction away from the interior of the outer shell; wherein, the top surface of the positioning post has the groove formed.

17. The battery cell of claim 16, wherein, The center line of the groove coincides with the center line of the positioning post.

18. The battery cell of claim 16, wherein, Along the thickness direction of the top cover, the depth of the groove is less than the protrusion height of the positioning post.

19. The battery cell of claim 16, wherein, Along the direction intersecting the thickness direction of the top cover, the width of the positioning post is d, and the width of the groove is greater than or equal to 0.05 mm and less than or equal to 0.9d.

20. The battery cell according to claim 19, characterized in that, The width of the groove is less than or equal to 0.8d.

21. The battery cell of claim 16, wherein, The groove on the top surface of the positioning post includes multiple grooves.

22. The battery cell of claim 1, wherein, The outer shell is made of steel, pure titanium, or titanium alloy.

23. A battery device, characterized by Includes the battery cell as described in any one of claims 1-22.

24. An electrical device, comprising: Includes the battery device as described in claim 23.

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