Battery cell, battery device, and electric device

Abstract

The application relates to a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, a pole is arranged on an end cover of the shell, an electrode assembly is arranged with a tab, an adapter is arranged on a side of the pole facing the electrode assembly, and the adapter has a first part and a second part connected with each other, the first part has a first connecting area connected with the pole, and the second part has a second connecting area connected with the tab; wherein the first part has a plurality of positioning protrusions, all the positioning protrusions are arranged at intervals on the outer periphery of the first connecting area and are arranged at the edge of the first part, the pole has a plurality of positioning grooves matched with the positioning protrusions one by one, the positioning grooves are stamping grooves formed on the pole, and the positioning protrusions are stamping protrusions formed on the first part; one side of the positioning grooves extends to the edge of the pole and forms an opening, and one side of the positioning protrusions extends to the edge of the first part. In this way, the positioning reliability of the adapter relative to the pole can be improved, and the position deviation of the adapter can be reduced.

Description

Technical Field

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

[0002] As a core component in the battery cell assembly process, the adapter undertakes multiple functions such as current carrying and connection between the terminal and the electrode assembly tabs.

[0003] Typically, the adapter and the terminal post, as well as the adapter and the tab, are laser-welded together. However, when the width of the battery cell is narrow, the size of the adapter also becomes correspondingly narrow. This can easily lead to positioning difficulties due to misalignment, further affecting the welding precision and quality between the adapter and the terminal post and tab. Utility Model Content

[0004] In view of the problem, this application provides a battery cell, a battery device, and an electrical device that can alleviate the problem of welding accuracy and welding quality between the adapter and the terminal post and the electrode tab being affected by the positional deviation of the adapter.

[0005] In a first aspect, this application provides a battery cell, comprising:

[0006] The outer casing includes an end cap and a housing; the end cap is disposed on one side of the housing, and a receiving cavity is formed between the two; the end cap is provided with an electrode post, at least a portion of which protrudes into the receiving cavity;

[0007] The electrode assembly is housed within a receiving cavity and has an electrode tab on the side facing the electrode post;

[0008] An adapter is disposed within a receiving cavity; the pole is located on the side of the adapter facing the end cap; the adapter has a first part and a second part for connection; the first part has a first connection area connected to the pole, and the second part has a second connection area connected to the pole lug.

[0009] The first part has multiple positioning protrusions, all of which are spaced apart on the outer periphery of the first connection area and located at the edge of the first part. The pole post has multiple positioning grooves, and each positioning protrusion is at least partially embedded in a corresponding positioning groove for positioning engagement.

[0010] The positioning groove is a stamped groove formed on the pole post, and the positioning protrusion is a stamped protrusion formed on the first part;

[0011] One side of the positioning groove extends to the edge of the pole and forms an opening, while one side of the positioning protrusion extends to the edge of the first part.

[0012] In the aforementioned battery cell, on the one hand, the positioning protrusion, located on the outer periphery of the first connection area connected to the terminal post, does not occupy the connection area between the terminal post and the first connection area of ​​the adapter. On the other hand, one side of the positioning protrusion extends to the edge of the first part, thus reducing the internal space occupied by the first part and reducing its size. Furthermore, since the outer wall surface of one side of the positioning protrusion does not require further processing, the forming process of the positioning protrusion on the first part is simpler. The method of one-to-one cooperation between multiple positioning protrusions on the adapter and multiple positioning grooves on the terminal post not only simplifies the process but also improves the positioning reliability of the adapter relative to the terminal post, reducing the possibility of adapter positional misalignment. This improves the welding accuracy and quality between the adapter and the terminal post, and between the adapter and the electrode tab. Simultaneously, the positioning groove occupies less internal space in the terminal post, and since the inner wall surface of one side of the positioning groove does not require further processing, the forming process of the positioning groove on the terminal post is simpler. In addition, the method of forming the groove and protrusion by stamping utilizes the material of the first part or the terminal post itself, simplifying the manufacturing process and reducing the impact on the structural strength of the first part or the terminal post.

[0013] In some embodiments, along the thickness direction of the adapter, the thickness of the first part is H, the protrusion height h1 of the positioning protrusion relative to the first part is 1 / 4H to 1 / 2H, and / or the depth h2 of the positioning groove is 1 / 4H to 5 / 6H.

[0014] By setting the protrusion height h1 of the positioning protrusion relative to the first part to 1 / 4H to 1 / 2H, the positioning protrusion can extend sufficiently into the positioning groove, improving positioning reliability. Furthermore, the smaller height difference between the positioning protrusion and the rest of the first part helps improve the structural strength of the positioning protrusion and reduces its susceptibility to breakage under stress. Similarly, by setting the depth h2 of the positioning groove to 1 / 4H to 5 / 6H, sufficient depth is provided for the positioning protrusion to extend within it, improving positioning reliability. Moreover, since the electrode post is typically thicker than the adapter, appropriately increasing the depth of the positioning groove has minimal impact on the structural strength of the electrode post.

[0015] In some embodiments, the positioning groove and the positioning protrusion are rectangular in shape.

[0016] This rectangular shape allows for high repeatability of positioning between the adapter and the pole, and the surface contact provides stronger directional constraints and stability, preventing relative rotation between the two.

[0017] In some embodiments, the bottom wall edge of the positioning groove is provided with a first rounded corner, and the top wall edge of the positioning protrusion is provided with a second rounded corner that cooperates with the first rounded corner.

[0018] In this way, it can guide the assembly of the positioning groove and the positioning protrusion, thereby reducing the assembly difficulty. In addition, it can reduce the wear after the two are assembled together and reduce the generation of metal wires.

[0019] In some embodiments, the first part includes two opposing first edges and two opposing second edges, each first edge being adjacent to the two second edges at both ends, wherein one first edge is connected to the second part, and the other first edge is provided with at least one positioning protrusion, and each second edge is provided with at least one positioning protrusion.

[0020] In this way, positioning protrusions can be set on all edges of the first part except those connecting to the second part, making the positioning of the entire first part with the pole more reliable and the force more even, which is more conducive to improving the welding accuracy and welding quality between the adapter and the pole, and between the adapter and the electrode tab.

[0021] In some embodiments, the first connection area is a first solder area, and the first solder area is soldered to the electrode post.

[0022] And / or the second connection area is the second solder mark area, which is soldered to the electrode tab.

[0023] On the one hand, since the first connection area is welded to the pole by the first solder area, the positioning method using the positioning protrusion on the outer periphery of the first connection area and the positioning groove of the pole can improve the positioning reliability of the adapter relative to the pole, thereby improving the welding accuracy and welding quality between the adapter and the pole, and between the adapter and the electrode tab. On the other hand, since the positioning protrusion is located on the outer periphery of the first solder area, it will not affect the welding.

[0024] On the one hand, the positioning method using the positioning protrusion on the outer periphery of the first connecting area and the positioning groove of the pole post for positioning improves the positioning reliability of the adapter relative to the pole post. This, in turn, improves the welding accuracy and quality between the adapter and the pole post when the adapter is welded to the pole tab via the second welding area. On the other hand, since the positioning protrusion is not located on the second part, it does not affect the welding process.

[0025] In some embodiments, the end cap is further provided with an insulating element on the side facing the receiving cavity, at least a portion of which is located between the end cap and the second part.

[0026] If the positioning protrusion is located on the second part, since at least a portion of the insulating component is located between the end cap and the second part, the second part of the adapter can only be positioned by the insulating component. However, the insulating component is prone to deformation at the high temperatures of welding, which affects the positioning reliability between the adapter and the insulating component. Therefore, by setting the positioning protrusion on the first part and positioning it in conjunction with the positioning groove on the conductive metal pole, the conductive metal is less prone to deformation under heat, thus improving the positioning reliability of the adapter piece.

[0027] In some embodiments, along the thickness direction of the adapter, the second part is disposed further away from the first part from the end cap, and the second part is spaced apart from the insulating member to form a gap space, with at least a portion of the tabs located within the gap space.

[0028] Excluding the possibility of the insulating component deforming due to heat, and since there is no position for a positioning protrusion to engage with the insulating component on the side of the second part facing the insulating component, placing the positioning protrusion on the first part for engagement with the pole post is more reliable and easier to operate. Furthermore, the electrode tab, constrained by the step between the first and second parts, will not interfere with the first connection area or the positioning protrusion, thus improving the connection reliability between the pole post and the adapter plate, and the positioning reliability between the pole post and the adapter plate.

[0029] In a second aspect, a battery device is provided, comprising the battery cell in any of the above embodiments.

[0030] In the aforementioned battery device, on the one hand, the positioning protrusion, located on the outer periphery of the first connection area connected to the terminal post, does not occupy the connection area between the terminal post and the first connection area of ​​the adapter. On the other hand, one side of the positioning protrusion extends to the edge of the first part, thus reducing the internal space occupied by the first part and reducing its size. Furthermore, since the outer wall surface of one side of the positioning protrusion does not require further processing, the forming process of the positioning protrusion on the first part is simpler. The method of one-to-one engagement of multiple positioning protrusions on the adapter with multiple positioning grooves on the terminal post not only simplifies the process but also improves the positioning reliability of the adapter relative to the terminal post, reducing the possibility of adapter positional misalignment. This improves the welding accuracy and quality between the adapter and the terminal post, and between the adapter and the electrode tab. Simultaneously, the positioning groove occupies less internal space in the terminal post, and since the inner wall surface of one side of the positioning groove does not require further processing, the forming process of the positioning groove on the terminal post is simpler. In addition, by forming the groove and protrusion through stamping, the material of the first part or the terminal post itself is utilized, simplifying the manufacturing process and reducing the impact on the structural strength of the first part or the terminal post.

[0031] Thirdly, an electrical device is also provided, including the battery in any of the above embodiments.

[0032] In the aforementioned electrical device, on the one hand, the positioning protrusion, located on the outer periphery of the first connection area connected to the pole, does not occupy the connection area between the pole and the adapter's first connection area. On the other hand, one side of the positioning protrusion extends to the edge of the first part, thus reducing the internal space occupied by the first part and consequently reducing its size. Furthermore, since the outer wall of one side of the positioning protrusion does not require further processing, the forming process of the positioning protrusion on the first part is simpler. The method of one-to-one engagement of multiple positioning protrusions on the adapter with multiple positioning grooves on the pole not only simplifies the process but also improves the positioning reliability of the adapter relative to the pole, reducing the possibility of adapter positional misalignment. This improves the welding accuracy and quality between the adapter and the pole, and between the adapter and the electrode lug. Simultaneously, the positioning groove occupies less internal space in the pole, and since the inner wall of one side of the positioning groove does not require further processing, the forming process of the positioning groove on the pole is simpler. Additionally, by forming the groove and protrusion through stamping, the material of the first part or pole itself is utilized, simplifying the manufacturing process and reducing the impact on the structural strength of the first part or pole.

[0033] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0035] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments.

[0036] Figure 2 This is an exploded structural diagram of a battery according to one or more embodiments.

[0037] Figure 3 This is an exploded structural diagram of a battery cell according to one or more embodiments.

[0038] Figure 4 This is a bottom view of the end cap assembly of a battery cell according to one or more other embodiments.

[0039] Figure 5 for Figure 4 The top view of the end cap assembly shown.

[0040] Figure 6 for Figure 5 The diagram shows a cross-sectional view of the end cap assembly at point AA.

[0041] Figure 7 for Figure 6 A partially enlarged schematic diagram of point A of the end cap assembly shown.

[0042] Figure 8 for Figure 6 The diagram shows the structure of the adapter piece in the end cap assembly.

[0043] Figure 9 for Figure 8 The front view of the adapter plate shown.

[0044] Figure 10 for Figure 6 The diagram shows the structure of the pole post in the end cap assembly.

[0045] Figure 11 for Figure 10 The diagram shows a cross-sectional view of the pole.

[0046] The reference numerals in the detailed embodiments are as follows:

[0047] 1000, Vehicle; 100, Battery assembly; 10, Housing; 11, First part; 12, Second part; 20, Battery cell; 21, End cap; 211, Terminal post; 2111, Second positioning part; 22, Housing; 23, Electrode assembly; 231, Tab; 24, Outer shell; 25, Adapter; 251, First part; 2511, First positioning part; 252, Second part; 26, Insulator; AA, First connection area; BB, Second connection area; 200, Controller; 300, Motor. Detailed Implementation

[0048] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0051] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0052] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, 1 and / or 2 can represent: 1 existing alone, 1 and 2 existing simultaneously, and 2 existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.

[0053] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0054] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0055] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0056] 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 in aerospace and other fields. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0057] In related technologies, a battery cell includes a cover plate, terminals assembled on the cover plate, electrode assemblies, adapters, and insulating components. Among these, the adapter, as a core component in the battery cell assembly process, undertakes multiple functions such as current carrying and connecting the terminals and electrode assemblies via tabs.

[0058] Typically, the adapter has a through hole for the post portion to pass through. Through the fit between the post portion and the through hole, a positioning relationship is established between the adapter and the post. Furthermore, the positioning of the adapter relative to the cover plate is achieved through the positioning of the post and the cover plate. Once the adapter is positioned relative to the cover plate, the connection accuracy and quality between the adapter, the post, and the tab are guaranteed.

[0059] However, when the adapter and the terminal post, or the adapter and the tab are connected by laser welding, the adapter lacks a through hole, making it impossible to establish a positioning relationship between the adapter, the terminal post, and the cover plate. Furthermore, given the narrow width of the battery cell, which also results in a narrow adapter, there is not enough space on the adapter to provide a positioning structure to ensure sufficient welding area, making it difficult to position the adapter. This will further affect the welding accuracy and quality between the adapter and the terminal post, and between the adapter and the tab.

[0060] To alleviate the problem of welding accuracy and quality between the adapter and the terminal post and tab due to difficulties in positioning the adapter, this application designs a battery cell including a shell, an electrode assembly, and an adapter. The shell includes an end cap and a housing; the end cap is disposed on one side of the housing, and a receiving cavity is formed between the two; the end cap has a terminal post, at least a portion of which protrudes into the receiving cavity. The electrode assembly is housed in the receiving cavity, and a tab is provided on the side facing the terminal post. The adapter is disposed in the receiving cavity, with the terminal post located on the side of the adapter facing the end cap. The adapter has a first part and a second part for connection. The first part has a first connection area connected to the terminal post, and the second part has a second connection area connected to the tab. The first part has a plurality of first positioning parts, all of which are spaced apart on the outer periphery of the first connection area and located at the edge of the first part. The tab has a plurality of second positioning parts, each first positioning part being positioned and engaged with a corresponding second positioning part.

[0061] On the one hand, since the first positioning part is located on the outer periphery of the first connection area connected to the pole post, it does not occupy the connection area between the pole post and the first connection area of ​​the adapter. On the other hand, since the first positioning part is located on the edge of the first part, it can reduce the internal space occupied by the first part, thereby reducing the size of the first part. Furthermore, by having multiple first positioning parts on the adapter and multiple second positioning parts on the pole post cooperate one by one, the positioning reliability of the adapter relative to the pole post can be improved, and the positional deviation of the adapter can be reduced. Therefore, the welding accuracy and welding quality between the adapter and the pole post, and between the adapter and the electrode tab, are improved.

[0062] The battery cell of this application is used in a battery to alleviate the welding accuracy and welding quality between the adapter and the terminal post and the tab due to the difficulty in positioning the adapter.

[0063] The batteries disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0064] 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.

[0065] 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.

[0066] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The 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 provided 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.

[0067] 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.

[0068] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. 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 accommodating the battery cell 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly 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 jointly define the space; alternatively, the first portion 11 and the second portion 12 may both 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 be of various shapes, such as a cylinder, a cuboid, etc.

[0069] 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.

[0070] 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.

[0071] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up a battery. Figure 3 The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0072] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved safety performance. Functional components such as terminals 211 can be provided on end cap 21. Terminals 211 can be used to electrically connect to electrode assembly 23 for outputting or inputting electrical energy into battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0073] The housing 22 is a component used to cooperate with the end cap 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 end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 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 end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0074] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more electrode assemblies 23. Electrode assembly 23 mainly consists of positive and negative electrode materials, a separator, and a current collector. Specifically, positive electrode material is coated onto the battery output electrode connector to form a positive electrode sheet, and negative electrode material is coated onto the battery output electrode connector to form a negative electrode sheet. The positive and negative electrode sheets are wound or stacked, and a separator is disposed between the positive and negative electrode sheets, thus forming electrode assembly 23. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute tabs 231. Figure 4 The positive and negative electrode tabs can be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tab 231 connects to the terminal 211 to form a current loop.

[0075] See appendix Figures 3-7 This application provides a battery cell 20, which includes a housing 24, an electrode assembly 23, and an adapter 25. The housing 24 includes an end cap 21 and a shell 22; the end cap 21 covers one side of the shell 22, forming a receiving cavity between them; the end cap 21 has a terminal post 211, at least a portion of which protrudes into the receiving cavity. The electrode assembly 23 is housed in the receiving cavity, and has a tab 231 on the side facing the terminal post 211. The adapter 25 is disposed in the receiving cavity, with the terminal post 211 located on the side of the adapter 25 facing the end cap 21. The adapter 25 has a first part 251 and a second part 252 for connection. The first part 251 has a first connection area AA connected to the terminal post 211, and the second part 252 has a second connection area BB connected to the tab 231. The first part 251 has a plurality of first positioning parts 2511, all of which are located at intervals on the outer periphery of the first connecting area AA and are disposed on the edge of the first part 251. The pole post 211 has a plurality of second positioning parts 2111, and each first positioning part 2511 is positioned and engaged with a corresponding second positioning part 2111.

[0076] The outer casing 24 may include the end cap 21 and the housing 22 mentioned above. The electrode post 211 is disposed on the end cap 21 and can be electrically connected to the electrode assembly 23 via the adapter 25. Specifically, the end cap 211 may be disposed on the end cap 21 with a through hole for the electrode post 211 to pass through, so that one end of the electrode post 211 can be exposed outside the end cap 21 for electrical connection with an external device, and the other end can protrude into the receiving cavity to connect with the adapter 25. The electrode post 211 can be a positive electrode post or a negative electrode post.

[0077] The adapter 25 is a component that enables the electrical connection between the tab 231 and the terminal 211, thereby facilitating the extraction of current from the electrode assembly 23 to the outside of the battery cell 20 via the tab 231, allowing the battery cell 20 to operate normally. The adapter 25 is typically sheet-shaped and can be, but is not limited to, using conductive metal sheets such as copper or aluminum sheets, or composite sheets of two or more conductive metals such as copper-aluminum composite sheets. The adapter sheet can be a positive or negative adapter, and the tab 231 can be either a corresponding positive or negative tab.

[0078] Specifically, the first part 251 and the second part 252 are two sections on the adapter 25. The adapter 25 may include only the first part 251 and the second part 252, or it may include other parts. In the embodiments of this application, the adapter 25 includes only the first part 251 and the second part 252, which are arranged and connected along the length of the adapter piece. The first connection area AA of the first part 251 refers to the area connected to the pole post 211. The position of the first connection area AA can vary depending on the connection method with the pole post 211. Generally, the boundary of the first connection area AA can be determined by the boundary of the projection area of ​​the pole post 211 along the thickness direction of the adapter 25 toward the adapter 25. Similarly, the second connection area BB of the second part 252 refers to the area connected to the tab 231. The position of the second connection area BB can vary depending on the connection method with the tab 231. Generally, the boundary of the second connection area BB can be determined by the boundary of the projection area of ​​the tab 231 along the thickness direction of the adapter 25 toward the adapter 25.

[0079] The first positioning part 2511 is used for position definition. The structure of the first positioning part 2511 is not limited; it can be a hole, slot, protrusion, etc. All the first positioning parts 2511 are spaced apart on the outer periphery of the first connecting area AA. This arrangement includes several specific layout methods. One possibility is that all the first positioning parts 2511 are arranged spaced around the first connecting area AA, that is, they are arranged around the entire outer periphery of the first connecting area AA. Another possibility is that all the first positioning parts 2511 are only spaced apart on a portion of the outer periphery of the first connecting area AA, rather than covering the entire outer periphery. For example, all the first positioning parts 2511 could be spaced apart on the outer periphery areas corresponding to the two sides of the first connecting area AA, instead of being arranged on the entire outer periphery.

[0080] All first positioning portions 2511 are provided at the edge of the first portion 251, wherein the edge of the first portion 251 refers to the portion close to the outer contour line of the first portion 251. When the first positioning portion 2511 is located at the edge of the first portion 251, at least a portion of the first positioning portion 2511 can occupy the edge of the first portion 251, specifically, it can occupy the outer contour line of the first portion 251.

[0081] The second positioning part 2111 is a part used for position definition. It can be positioned and engaged with the first positioning part 2511, and a definite positional relationship can be formed between the two through the positioning and engagement.

[0082] Therefore, in the battery cell 20 of this application embodiment, on the one hand, the first positioning part 2511 is located on the outer periphery of the first connection area AA connected to the pole post 211, so it does not occupy the connection area between the pole post 211 and the first connection area AA of the adapter 25. On the other hand, the first positioning part 2511 is provided at the edge of the first part 251, so it can reduce the internal space occupied by the first part 251, thereby reducing the size of the first part 251. By cooperating one by one with the multiple first positioning parts 2511 on the adapter 25 and the multiple second positioning parts 2111 on the pole post 211, the positioning reliability of the adapter 25 relative to the pole post 211 can be improved, and the positional deviation of the adapter 25 can be reduced. Therefore, the welding accuracy and welding quality between the adapter 25 and the pole post 211 and between the adapter 25 and the tab 231 are improved.

[0083] See Figures 8-11 Specifically, in the embodiments of this application, one of the first positioning part 2511 and the second positioning part 2111 is a positioning groove, and the other of the first positioning part 2511 and the second positioning part 2111 is a positioning protrusion. The positioning protrusion is at least partially embedded in the positioning groove for positioning engagement.

[0084] The positioning protrusion being at least partially embedded in the positioning groove for positioning engagement means that at least part of the positioning protrusion extends into the positioning groove, so that at least part of the outer wall surface of the positioning protrusion and at least part of the inner wall surface of the positioning groove are face-to-face in contact, thereby achieving relative positioning between the two. The outer dimensions of the positioning protrusion and the inner dimensions of the positioning groove should be compatible. For example, if the outer dimensions of the positioning protrusion have length and width, then the groove length in the corresponding inner dimensions of the positioning groove should be slightly greater than that length, and the groove width should be slightly greater than that width.

[0085] The method of setting positioning protrusions and positioning grooves on the adapter plate and the pole 211 is simple, and the process of positioning and fitting between the adapter plate and the pole 211 through positioning protrusions and positioning grooves is also simple, which improves the reliability of positioning.

[0086] Specifically, since the adapter 25 is typically sheet-shaped and relatively thin, the first positioning portion 2511 is designed as a positioning protrusion, which simplifies the manufacturing process and allows the protrusion dimensions of the positioning protrusion to be unrestricted by the thickness of the adapter 25. The pole post 211 is relatively thick, so the second positioning portion 2111 is designed as a positioning groove. This simplifies the manufacturing process without affecting the structural strength of the pole post 211, and the depth of the positioning groove can also be increased, resulting in a deeper fit with the positioning protrusion and improving the reliability of the fit between the positioning groove and the positioning protrusion. Of course, in other embodiments, the positioning groove can also be positioned on the adapter 25 by increasing the thickness of the first portion 251 of the adapter 25.

[0087] According to some embodiments of this application, the cross-sectional shape of the positioning groove and the positioning protrusion is rectangular.

[0088] The rectangular shape of the positioning groove and the positioning protrusion means that their cross-section is rectangular.

[0089] This rectangular shape allows for high repeatability of positioning between the adapter plate and the pole post 211, and the surface contact provides stronger directional constraints and stability, preventing relative rotation between the two.

[0090] According to some embodiments of this application, the positioning groove is a stamped groove formed on the first part 251 or the pole post 211.

[0091] The stamped grooves formed on the first part 251 or the pole post 211 referred to here are groove structures formed by stamping a portion of the first part 251 or the pole post 211.

[0092] By forming the groove through stamping, the material of the first part 251 or the pole post 211 itself is utilized, which simplifies the process and reduces the impact on the structural strength of the first part 251 or the pole post 211.

[0093] Alternatively, the positioning protrusion may be a stamped protrusion formed on the first part 251 or the pole post 211.

[0094] The stamped protrusions formed on the first part 251 or the pole post 211 referred to here are protruding structures formed by stamping a portion of the first part 251 or the pole post 211.

[0095] By forming protrusions through stamping, the material of the first part 251 or the pole post 211 itself is utilized, which simplifies the process and reduces the impact on the structural strength of the first part 251 or the pole post 211.

[0096] According to some embodiments of this application, one side of the positioning groove extends to the edge of the first part 251 or the pole post 211 and forms an opening.

[0097] The fact that one side of the positioning groove extends to the edge of the first part 251 or the pole post 211 and forms a communicating opening means that one side of the positioning groove extends to the outer contour line of the first part 251 or the pole post 211, so that one side of the positioning groove forms an opening on the side of the first part 251 or the pole post 211.

[0098] In other words, the positioning groove occupies the outer contour line at the setting position of the first part 251 or the pole post 211, so that the positioning groove occupies less space inside the first part 251 or the pole post 211. Furthermore, since the inner wall surface of one side of the positioning groove does not need to be processed, the forming process of the positioning groove on the first part 251 or the pole post 211 is simpler.

[0099] In addition, one side of the positioning protrusion extends to the edge of the first part 251 or the pole post 211.

[0100] The phrase "one side of the positioning protrusion extends to the edge of the first part 251 or the pole post 211" means that one side of the positioning protrusion extends to the outer contour line of the first part 251 or the pole post 211. In other words, a part of the outer contour line of the first part 251 or the pole post 211 is the outer contour line of the positioning protrusion.

[0101] Thus, the positioning protrusion occupies the outer contour line at the setting position of the first part 251 or the pole post 211, making the positioning protrusion occupy less space inside the first part 251 or the pole post 211. Furthermore, since one side of the outer wall of the positioning protrusion does not need to be processed, the forming process of the positioning protrusion on the first part 251 or the pole post 211 is simpler.

[0102] According to some embodiments of this application, when the first positioning part 2511 is a positioning protrusion and the second positioning part 2111 is a positioning groove, along the thickness direction of the adapter 25, the thickness of the first part 251 is H, and the protrusion height h1 of the positioning protrusion relative to the first part 251 is 1 / 4H to 1 / 2H.

[0103] By setting the protrusion height h1 of the positioning protrusion relative to the first part 251 to be 1 / 4H to 1 / 2H, on the one hand, the positioning protrusion can protrude into the positioning groove with sufficient height, thereby improving the positioning reliability. On the other hand, the height difference between the positioning protrusion and the rest of the first positioning part 2511 is small, which is beneficial to improving the structural strength of the positioning protrusion and reducing the likelihood of the positioning protrusion breaking under stress.

[0104] In addition, the depth h2 of the positioning groove is 1 / 4H to 5 / 6H.

[0105] By setting the depth h2 of the positioning groove to 1 / 4H~5 / 6H, on the one hand, there is enough depth for the positioning protrusion to extend into it, improving the positioning reliability; on the other hand, the thickness of the pole post 211 is usually thicker than that of the adapter 25, so appropriately increasing the depth of the positioning groove has little impact on the structural strength of the pole post 211.

[0106] In addition, if both the positioning groove and the positioning protrusion are formed by stamping, setting the protrusion height h1 of the positioning protrusion relative to the first part 251 to be 1 / 4H to 1 / 2H, and / or the depth h2 of the positioning groove to be 1 / 4H to 5 / 6H, can also facilitate the formation of the positioning groove and the positioning protrusion.

[0107] In some specific embodiments, the thickness H of the first part 251 of the adapter is 0.6 mm to 1.8 mm, the protrusion height h1 of the positioning protrusion relative to the first part 251 is 0.2 mm to 1.0 mm, and the depth h2 of the positioning groove is 0.2 mm to 1.5 mm.

[0108] According to some embodiments of this application, the bottom wall edge of the positioning groove is provided with a first rounded corner, and the top wall edge of the positioning protrusion is provided with a second rounded corner that cooperates with the first rounded corner.

[0109] In this way, it can guide the assembly of the positioning groove and the positioning protrusion, thereby reducing the assembly difficulty. In addition, it can reduce the wear after the two are assembled together and reduce the generation of metal wires.

[0110] Specifically, the radius of the fillet can be 0.2 mm to 0.5 mm.

[0111] According to some embodiments of this application, the first part 251 includes two opposing first edges and two opposing second edges, with each first edge adjacent to the two second edges at both ends, wherein one first edge is connected to the second part 252, and the other first edge is provided with at least one first positioning part 2511, and each second edge is provided with at least one first positioning part 2511.

[0112] In this way, the first positioning part 2511 can be provided on all edges of the first part 251 except the edge connected to the second part 252, so that the positioning of the entire first part 251 with the pole post 211 is more reliable and the force is more uniform, which is more conducive to improving the welding accuracy and welding quality between the adapter 25 and the pole post 211, and between the adapter 25 and the pole tab 231.

[0113] Specifically, the number of first positioning parts 2511 provided on the first edge and each of the second edges is the same. For example, the number of first positioning parts 2511 provided on the first edge and each of the second edges is one. Furthermore, the first positioning parts 2511 can be located at the center of the first edge and each of the second edges, which is more conducive to the reliability of positioning.

[0114] According to some embodiments of this application, the first connection area AA is a first soldering area, and the first soldering area is soldered to the pole post 211.

[0115] A solder mark is a mark formed by welding two objects together.

[0116] On the one hand, since the first connecting area AA is welded to the pole post 211 by the first solder area, the positioning method of positioning the adapter 25 relative to the pole post 211 by the first positioning part 2511 located on the outer periphery of the first connecting area AA and the second positioning part 2111 of the pole post 211 can improve the positioning reliability of the adapter 25 relative to the pole post 211, thereby improving the welding accuracy and welding quality between the adapter 25 and the pole post 211, and between the adapter 25 and the tab 231. On the other hand, since the first positioning part 2511 is located on the outer periphery of the first solder area, it will not affect the welding.

[0117] In addition, the second connection area BB is the second soldering area, which is soldered to the tab 231.

[0118] On the one hand, by positioning the adapter 25 relative to the pole post 211 through the first positioning part 2511 located on the outer periphery of the first connecting area AA and at the edge of the first part 251, and the second positioning part 2111 of the pole post 211, the positioning reliability of the adapter 25 relative to the pole post 211 can be improved. This, in turn, improves the welding accuracy and quality between the adapter 25 and the pole post 231 when the adapter piece is welded to the pole tab 231 through the second welding area. On the other hand, since the first positioning part 2511 is not located on the second part 252, it will not affect the welding process.

[0119] Combination Figure 7 According to some embodiments of this application, the end cap 21 is further provided with an insulating member 26 on the side facing the receiving cavity, and at least a portion of the insulating member 26 is located between the end cap 21 and the second part 252.

[0120] The insulating component 26 is used to insulate the end cap 21 from the electrode assembly 23. The insulating component 26 can be a lower plastic, which can be pre-molded as a single piece of plastic or assembled from various plastic parts. The material is an insulating material.

[0121] In this embodiment, if the first positioning part 2511 is disposed on the second part 252, since at least a portion of the insulating member 26 is located between the end cap 21 and the second part 252, the second part 252 of the adapter 25 can only be positioned by the insulating member 26. However, the insulating member 26 is prone to deformation at the high temperature of welding, which affects the positioning reliability between the adapter 25 and the insulating member 26. Therefore, this application disposes of the first positioning part 2511 on the first part 251 and positions it in conjunction with the second positioning part 2111 on the conductive metal pole post 211. The conductive metal is less prone to deformation when heated, thus improving the positioning reliability of the adapter piece.

[0122] Furthermore, along the thickness direction of the adapter 25, the second part 252 and the first part 251 are disposed further away from the end cap 21, and the second part 252 and the insulating member 26 are spaced apart to form a gap space, and at least part of the tab 231 is located in the gap space.

[0123] It should be noted that the second part 252 and the first part 251 are located further away from the end cap 21 along the thickness direction of the adapter 25, which means that the second part 252 and the first part 251 are not at the same height, so that a height difference is formed between the second part 252 and the first part 251, and thus a step is formed at the connection between the two.

[0124] The tab 231 is bent into the space and connected to the side of the second part 252 facing the insulator 26. Because of the step between the second part 252 and the first part 251, the tab 231 is prevented from falling laterally into the first connection area AA and the first positioning part 2511 of the first part 251 when the tab 231 is bent to the side of the second part 252 facing the insulator 26. The step provides lateral restraint to the tab 231.

[0125] Therefore, excluding the possibility of the insulating component 26 being easily deformed by heat, and since there is no space on the side of the second part 252 facing the insulating component 26 for the first positioning part 2511 to position and engage with the insulating component 26, the method of positioning the first positioning part 2511 on the first part 251 to position and engage with the pole post 211 is more reliable and easier to operate. In addition, the pole tab 231 is limited by the step between the first part 251 and the second part 252, and will not interfere with the first connection area AA and the first positioning part 2511, thereby improving the connection reliability between the pole post 211 and the adapter piece, and the positioning reliability between the pole post 211 and the adapter piece.

[0126] According to some embodiments of this application, refer to Figures 2-5 A battery device 100 is provided, including the battery cell 20 in any of the above embodiments.

[0127] In the battery device 100 of this application embodiment, on the one hand, the first positioning part 2511 is located on the outer periphery of the first connection area AA connected to the terminal post 211, so it does not occupy the connection area between the terminal post 211 and the first connection area AA of the adapter 25. On the other hand, the first positioning part 2511 is provided at the edge of the first part 251, so it can reduce the internal space occupied by the first part 251, thereby reducing the size of the first part 251. By cooperating one by one with the multiple first positioning parts 2511 on the adapter 25 and the multiple second positioning parts 2111 on the terminal post 211, the positioning reliability of the adapter 25 relative to the terminal post 211 can be improved, and the positional deviation of the adapter 25 can be reduced. Therefore, the welding accuracy and welding quality between the adapter 25 and the terminal post 211, and between the adapter 25 and the tab 231 are improved.

[0128] In addition, this application also provides an electrical device, including the battery device 100 in any of the above embodiments.

[0129] In the electrical device of this application embodiment, on the one hand, the first positioning part 2511 is located on the outer periphery of the first connection area AA connected to the pole post 211, so it does not occupy the connection area between the pole post 211 and the first connection area AA of the adapter 25. On the other hand, the first positioning part 2511 is provided at the edge of the first part 251, so it can reduce the internal space occupied by the first part 251, thereby reducing the size of the first part 251. By cooperating one by one with the multiple first positioning parts 2511 on the adapter 25 and the multiple second positioning parts 2111 on the pole post 211, the positioning reliability of the adapter 25 relative to the pole post 211 can be improved, and the positional deviation of the adapter 25 can be reduced. Therefore, the welding accuracy and welding quality between the adapter 25 and the pole post 211, and between the adapter 25 and the tab 231 are improved.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing includes an end cap and a housing; the end cap is disposed on one side of the housing, and a receiving cavity is formed between the two; the end cap is provided with an electrode post, at least a portion of which protrudes into the receiving cavity; An electrode assembly is housed within the receiving cavity and has tabs on the side facing the electrode post; An adapter is disposed within the receiving cavity; the pole is located on the side of the adapter facing the end cap; the adapter has a first part and a second part for connection, the first part having a first connection area connected to the pole, and the second part having a second connection area connected to the electrode tab; The first part has multiple positioning protrusions, all of which are spaced apart on the outer periphery of the first connection area and located at the edge of the first part. The pole post has multiple positioning grooves, and each positioning protrusion is at least partially embedded in a corresponding positioning groove for positioning. The positioning groove is a stamped groove formed on the pole post, and the positioning protrusion is a stamped protrusion formed on the first part; One side of the positioning groove extends to the edge of the pole post and forms an opening, and one side of the positioning protrusion extends to the edge of the first part.

2. The battery cell according to claim 1, characterized in that, Along the thickness direction of the adapter, the thickness of the first part is H, the protrusion height h1 of the positioning protrusion relative to the first part is 1 / 4H to 1 / 2H, and / or the depth h2 of the positioning groove is 1 / 4H to 5 / 6H.

3. The battery cell according to claim 1, characterized in that, The cross-sectional shape of the positioning groove and the positioning protrusion is rectangular.

4. The battery cell according to claim 1, characterized in that, The bottom edge of the positioning groove is provided with a first rounded corner, and the top edge of the positioning protrusion is provided with a second rounded corner that cooperates with the first rounded corner.

5. The battery cell according to any one of claims 1 to 4, characterized in that, The first part includes two opposing first edges and two opposing second edges, each of the first edges being adjacent to the two second edges at both ends, wherein one of the first edges is connected to the second part, and the other of the first edges is provided with at least one positioning protrusion, and each of the second edges is provided with at least one positioning protrusion.

6. The battery cell according to any one of claims 1 to 4, characterized in that, The first connection area is a first solder joint area, which is soldered to the electrode post; and / or The second connection area is the second solder mark area, which is soldered to the electrode tab.

7. The battery cell according to any one of claims 1 to 4, characterized in that, The end cap is further provided with an insulating member on the side facing the receiving cavity, and at least a portion of the insulating member is located between the end cap and the second part.

8. The battery cell according to claim 7, characterized in that, Along the thickness direction of the adapter, the second part is disposed further away from the first part from the end cap, and the second part is spaced apart from the insulating member to form a gap space, with at least a portion of the tabs located within the gap space.

9. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 8.

10. An electrical device, characterized in that, Includes the battery device as described in claim 9.

Images