Battery monomer, battery device and electric device

Abstract

The utility model relates to a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell and a pole. The shell comprises a shell body and an end cover assembly, an electrode assembly is accommodated in the shell body, the end cover assembly covers the shell body, the shell comprises a first wall, the pole is arranged on the first wall, the pole comprises a first surface and a second surface which are oppositely arranged in the thickness direction of the end cover assembly, the first surface is arranged towards the interior of the shell body and is provided with a first welding mark, and the second surface is arranged towards the interior of the shell body and is provided with a second welding mark. The second surface faces the outside of the shell and is provided with a second welding mark, and the area of the second welding mark is larger than that of the first welding mark. Compared with the mode that the areas of the two welding marks are set to be equal, the area of the second welding mark is larger than the area of the first welding mark, the welding area of the pole can be increased, the overcurrent capacity of the pole is improved, the overcurrent capacity of the battery monomer is improved, and the working performance of the battery monomer is enhanced.

Description

Technical Field

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

[0002] As an accessory in lithium-ion batteries, the end cap serves two main functions: firstly, it seals the internal and external environments by welding it to the casing; secondly, it connects the internal and external circuits, allowing the current inside the battery cell to be transported to the outside through the terminal of the end cap, thus acting as a current guide.

[0003] During the use of a battery cell, the strength of the current-carrying capacity of the terminals affects the battery's performance. Therefore, there is an urgent need for an end cap with strong current-carrying capacity. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can alleviate the problem of poor current carrying capacity of the terminals.

[0005] In a first aspect, this application provides a battery cell, including a housing and an electrode post. The housing includes a casing and an end cap assembly, with an electrode assembly housed inside the casing. The end cap assembly is fitted onto the casing. The housing includes a first wall, and the electrode post is disposed on the first wall. Along the thickness direction of the end cap assembly, the electrode post includes a first surface and a second surface disposed opposite to each other. The first surface faces inward toward the interior of the casing and has a first solder mark, while the second surface faces outward toward the exterior of the casing and has a second solder mark. The area of ​​the second solder mark is larger than the area of ​​the first solder mark.

[0006] In the technical solution of this application embodiment, by setting the areas of the two solder marks to be equal, such that the area of ​​the second solder mark is larger than the area of ​​the first solder mark, the welding area of ​​the electrode post can be increased, the current carrying capacity of the electrode post can be improved, thereby improving the current carrying capacity of the battery cell and enhancing the working performance of the battery cell.

[0007] In some embodiments, along the thickness direction of the end cap assembly, the pole post includes a first part, a second part, and a third part. The second part is connected to the end cap assembly and is layered between the first part and the third part. The surface of the first part facing away from the second part has a first solder mark, and the surface of the third part facing away from the second part has a second solder mark.

[0008] The first part is additionally set on the second part to form the first solder mark, and the third part is additionally set to form the second solder mark. This allows users to process the dimensions of the first and second parts according to actual conditions, so as to adjust the area of ​​the first and second solder marks. This not only improves the current carrying capacity of the pole, but also broadens the application range of the pole and facilitates the processing of the pole.

[0009] In some embodiments, the first part is constructed as a cylinder and protrudes from the middle of the second part; the third part is constructed as a strip and protrudes from the middle of the surface of the second part facing away from the first part.

[0010] In this way, while maximizing the area of ​​the first and second solder marks, the structure of the first and second parts is simplified, making them easier to process.

[0011] In some embodiments, there are multiple first portions, all of which are spaced out and protrude from the middle of the second portion.

[0012] Compared to setting only one first part to connect to the electrode assembly 230 in the second part, the above solution increases the number of first solder marks by increasing the number of first parts in a single pole. The welding area between a single pole and the electrode assembly 230 is the sum of the areas of all the first solder marks, that is, the welding area between a single pole and the electrode assembly 230 is increased, thereby improving the current carrying capacity of the pole.

[0013] In some embodiments, the ratio of the area of ​​the first solder mark to the area of ​​the second solder mark ranges from 0.25 to 0.6.

[0014] By reasonably setting the ratio of the area of ​​the first solder mark to the area of ​​the second solder mark, it can be ensured that the areas of the first solder mark and the second solder mark are within a suitable range, so as to maximize the area of ​​the first solder mark and the second solder mark, thereby improving the current carrying capacity of the electrode post and improving the working performance of the battery cell.

[0015] In some embodiments, the ratio of the area of ​​the second solder mark to the area of ​​the end cap assembly ranges from 0.08 to 0.4.

[0016] By reasonably setting the ratio of the area of ​​the second solder mark to the area of ​​the end cap assembly, the area of ​​the second solder mark can be increased as much as possible without affecting the performance of the end cap assembly, so as to maximize the current carrying capacity of the pole.

[0017] In some embodiments, the ratio of the area of ​​the first solder mark to the area of ​​the end cap assembly ranges from 0.025 to 0.4.

[0018] By reasonably setting the ratio of the area of ​​the first solder mark to the area of ​​the end cap assembly, the area of ​​the first solder mark can be increased as much as possible without affecting the performance of the end cap assembly, so as to maximize the current carrying capacity of the pole.

[0019] In some embodiments, the battery cell includes an adapter piece, one end of which is connected to a first solder mark and the other end of which is connected to a tab of the electrode assembly; or, the first solder mark is directly soldered to the tab of the electrode assembly.

[0020] This configuration allows for the selection of whether or not to install an adapter plate, improving the flexibility of the components required for each battery cell and broadening the application range of the battery cell.

[0021] In some embodiments, the width of the orthographic projection of the pole post is L1, and the width of the end cap assembly is L2, perpendicular to the thickness direction of the end cap assembly, where 0.16≤L1 / L2≤0.89.

[0022] By setting the L1 / L2 ratio appropriately, a reasonable gap can be ensured between the edge of the terminal post and the end cap assembly, thereby improving the current carrying capacity of the terminal post while ensuring the safety of the battery cell.

[0023] In some embodiments, the length of the orthographic projection of the pole post is L3, and the length of the end cap assembly is L4, perpendicular to the thickness direction of the end cap assembly, where 0.1 ≤ L3 / L4 ≤ 0.43.

[0024] By setting the L3 / L4 ratio appropriately, a reasonable gap can be ensured between the edge of the terminal post and the end cap assembly, thereby improving the current carrying capacity of the terminal post while ensuring the safety of the battery cell.

[0025] In some embodiments, the ratio of the width of the orthographic projection of the pole post to the length of the orthographic projection of the pole post, perpendicular to the thickness direction of the end cap assembly, ranges from 1:1.3 to 1:15.

[0026] By reasonably setting the ratio of L1 / L3, the first and second solder marks on the terminal post can meet the requirements without affecting the use of the end cap assembly, thereby improving the current carrying capacity of the terminal post and ensuring the safety of the battery cell.

[0027] Secondly, this application provides a battery device that includes the battery cell described in the above embodiments.

[0028] Thirdly, this application provides an electrical device that includes the battery device described in the above embodiments.

[0029] 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

[0030] 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:

[0031] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments.

[0032] Figure 2 An exploded view of a battery according to one or more embodiments.

[0033] Figure 3 This is an exploded structural diagram of a battery cell according to one or more embodiments.

[0034] Figure 4 This is an exploded structural diagram of a battery cell according to one or more embodiments.

[0035] Figure 5 This is an exploded view of the end cap assembly of a battery cell according to one or more embodiments.

[0036] Figure 6 This is an exploded view of the terminals of a battery cell according to one or more embodiments.

[0037] Figure 7 This is a schematic diagram of the terminal post of a battery cell according to one or more embodiments.

[0038] Figure 8 This is an exploded view of the terminals of a battery cell according to one or more embodiments.

[0039] Figure 9 This is a top view of the end cap assembly of a battery cell according to one or more embodiments.

[0040] Figure 10 This is an exploded view of a partially hidden structure of a battery cell according to one or more embodiments.

[0041] The reference numerals in the detailed embodiments are as follows:

[0042] 1000, vehicles;

[0043] 100. Battery assembly; 200. Controller; 300. Motor;

[0044] 10. Housing; 11. First component; 12. Second component;

[0045] 20. Battery cell; 21. Housing; 210. End cap assembly; 212. Terminal post; 2121. First part; 21211. First weld mark; 2122. Second part; 21221. Annular groove; 2123. Third part; 21231. Second weld mark; 213. Upper plastic part; 214. Welding ring; 215. Sealing ring; 216. Lower plastic part; 220. Housing; 230. Electrode assembly. Detailed Implementation

[0046] 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.

[0047] 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.

[0048] In the description of the embodiments of this application, the technical terms "first," "second," etc., 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.

[0049] 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.

[0050] In the description of the embodiments of this application, the term "and / or" merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0051] In the description of the embodiments of this application, if any, 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).

[0052] In the description of the embodiments of this application, if any technical 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," or "circumferential" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, and does 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. Therefore, it should not be construed as a limitation on the embodiments of this application.

[0053] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0054] 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 extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0055] During the assembly of a battery cell, the terminals are typically connected to the tabs of the electrode assembly by welding. The size of the welding area of ​​the terminal directly affects its current-carrying capacity; the larger the welding area, the stronger the current-carrying capacity of the terminal.

[0056] Therefore, to improve the poor current-carrying capacity of the terminals, this application provides a battery cell. The terminals of the battery cell include a first solder mark and a second solder mark disposed opposite each other, wherein the area of ​​the second solder mark is larger than the area of ​​the first solder mark. By distributing two solder marks of equal area, the welding area of ​​the terminals can be increased, thereby improving the current-carrying capacity of the terminals.

[0057] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and batteries disclosed in this application.

[0058] 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, energy storage products, 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, and energy storage products can include energy storage stations, etc.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] Please refer to Figure 2 , Figure 2This 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 the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first component 11 and a second component 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second component 12 may be a hollow structure with one open end, and the first component 11 may be a plate-like structure, covering the open side of the second component 12 so that the first component 11 and the second component 12 jointly define the space. Alternatively, the first component 11 and the second component 12 may both be hollow structures with one open side, with the open side of the first component 11 covering the open side of the second component 12. Of course, the housing 10 formed by the first component 11 and the second component 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0063] 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.

[0064] 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.

[0065] 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 As shown, the battery cell 20 includes an end cap assembly 210, a housing 220, an electrode assembly 230, and other functional components.

[0066] End cap assembly 210 refers to a component that covers the opening of housing 220 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap assembly 210 may be adapted to the shape of housing 220 to fit it. Alternatively, end cap assembly 210 may be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap assembly 210 is less prone to deformation under pressure and impact, enabling battery cell 20 to have higher structural strength and improved safety performance. Functional components such as terminals 212 may be provided on end cap assembly 210. Terminals 212 can be used for electrical connection with electrode assembly 230 for outputting or inputting electrical energy to battery cell 20. In some embodiments, end cap assembly 210 may 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 end cap assembly 210 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating member may also be provided on the inner side of the end cap assembly 210. The insulating member can be used to isolate the electrical connection components in the housing 220 from the end cap assembly 210 to reduce the risk of short circuit. For example, the insulating member can be plastic, rubber, etc.

[0067] The housing 220 is a component used to cooperate with the end cap assembly 210 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 230, electrolyte, and other components. The housing 220 and the end cap assembly 210 can be independent components. An opening can be provided on the housing 220, and the end cap assembly 210 closes the opening to form the internal environment of the battery cell 20. Alternatively, the end cap assembly 210 and the housing 220 can be integrated. Specifically, the end cap assembly 210 and the housing 220 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 220, the end cap assembly 210 closes the housing 220. The housing 220 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 220 can be determined according to the specific shape and size of the electrode assembly 230. The shell 220 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0068] Electrode assembly 230 is the component in the battery cell 20 where electrochemical reactions occur. The casing 220 may contain one or more electrode assemblies 230. The electrode assembly 230 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 230, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both 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 tabs connect to the terminals 212 to form a current loop.

[0069] like Figures 4 to 6 As shown, the battery cell 20 includes a housing 21 and an electrode post 212. The housing 21 includes a casing 220 and an end cap assembly 210. The electrode assembly 230 is housed inside the casing 220. The end cap assembly 210 covers the casing 220. The housing 21 includes a first wall, which can be one of the walls on the casing 220 and the end cap assembly 210. In this embodiment, the first wall is provided on the end cap assembly 210 as an example.

[0070] The pole post 212 is disposed on the first wall, wherein, along the thickness direction of the end cap assembly 210, the pole post 212 includes a first surface and a second surface disposed opposite to each other. The first surface is disposed facing the interior of the housing 220 and has a first solder mark 21211, and the second surface is disposed facing the exterior of the housing 220 and has a second solder mark 21231. The area of ​​the second solder mark 21231 is larger than the area of ​​the first solder mark 21211.

[0071] The end cap assembly 210 is used to cover the opening of the housing 220 and to support the terminal post 212. The terminal post 212 serves to connect and conduct electricity, ensuring that current can flow smoothly through the various parts of the battery cell 20. The first solder mark 21211 of the terminal post 212 is used to weld to the electrode assembly 230 to achieve electrical connection. The shape of the first solder mark 21211 may be, but is not limited to, elliptical, elongated, etc. The second solder mark 21231 of the terminal post 212 is used to weld to the outside to achieve electrical connection. The shape of the second solder mark 21231 may be, but is not limited to, elliptical, elongated, etc.

[0072] For example, during the assembly of the battery cell 20, the first solder mark 21211 of the terminal post 212 can be soldered to the electrode assembly 230, and the second solder mark 21231 can be soldered to components such as the busbar. Instead of setting the areas of the two solder marks to be equal, making the area of ​​the second solder mark 21231 larger than the area of ​​the first solder mark 21211 increases the welding area of ​​the terminal post 212, improves the current-carrying capacity of the terminal post 212, thereby improving the current-carrying capacity of the battery cell 20 and enhancing its performance.

[0073] Please continue reading. Figure 6 In some embodiments, along the thickness direction of the end cap assembly 210, the pole post 212 includes a first part 2121, a second part 2122 and a third part 2123 stacked together. The second part 2122 is connected to the end cap assembly 210 and is stacked between the first part 2121 and the third part 2123. The surface of the first part 2121 facing away from the second part 2122 is provided with a first solder mark 21211, and the surface of the third part 2123 facing away from the second part 2122 is provided with a second solder mark 21231.

[0074] The second part 2122 is used to support the first part 2121 and the third part 2123, and the second part 2122 serves an assembly function. In other words, when the pole post 212 is assembled onto the end cap assembly 210, the second part 2122 is connected to the end cap assembly 210. The connection between the second part 2122 and the end cap assembly 210 can be, but is not limited to, a threaded connection or welding.

[0075] An additional first part 2121 is provided on the second part 2122 to form a first solder mark 21211, and an additional third part 2123 is provided to form a second solder mark 21231. This allows users to process the dimensions of the first part 2121 and the second part 2122 according to actual conditions, so as to adjust the area of ​​the first solder mark 21211 and the second solder mark 21231. This not only improves the current carrying capacity of the pole post 212, but also broadens the application range of the pole post 212 and facilitates the processing of the pole post 212.

[0076] Specifically, such as Figure 6 As shown, in some embodiments, the first part 2121 is constructed as a cylinder and protrudes from the middle of the second part 2122; the third part 2123 is constructed as a strip and protrudes from the middle of the surface of the second part 2122 facing away from the first part 2121.

[0077] For example, the second part 2122 and the third part 2123 have the same shape, similar to an oblong hole, but the third part 2123 is smaller than the second part 2122, and the third part 2123 protrudes relative to the second part 2122. The first part 2121 protrudes relative to the second part 2122 to form a cylinder, and the first solder mark 21211 on the first part 2121 is circular, thus maximizing the area of ​​the first solder mark 21211.

[0078] In this way, while maximizing the area of ​​the first solder mark 21211 and the second solder mark 21231, the structure of the first part 2121 and the second part 2122 is simplified, making them easier to process.

[0079] In some embodiments, such as Figure 7 As shown, the second part 2122 is also provided with an annular groove 21221. The annular groove 21221 is located in the circumference of the first part 2121. A sealing ring 215 can be provided in the annular groove 21221 to seal the electrode post 212, thereby improving the sealing effect between the end cap assembly 210 and the housing 220 and reducing the probability of electrolyte leakage from the electrode post 212 in the housing 220.

[0080] It should be noted that, in other embodiments, the structure of the first part 2121 and the second part 2122 may also be configured as a frustum shape, etc.

[0081] More specifically, such as Figure 8 As shown, in some embodiments, there are multiple first portions 2121, and all first portions 2121 are spaced out and protrude from the middle of the second portion 2122.

[0082] For example, the second portion 2122 has two protruding cylinders, each cylinder being configured to form a first portion 2121 (i.e., a sub-terminal) with the same polarity. The terminal 212 is also equipped with an upper plastic part 213 and a welding ring 214. During assembly, the upper plastic part 213 is located between the terminal 212 and the welding ring 214, and surrounds the first portion 2121 to facilitate assembly. When a single terminal 212 is connected to the electrode assembly 230, both sub-terminals are connected to the electrode assembly 230.

[0083] Compared to having only one first portion 2121 connected to the electrode assembly 230 in the second portion 2122, the above solution increases the number of first solder marks 21211 by increasing the number of first portions 2121 in a single electrode post 212. The welding area between a single electrode post 212 and the electrode assembly 230 is the sum of the areas of all first solder marks 21211, thus increasing the welding area between a single electrode post 212 and the electrode assembly 230 and improving the current-carrying capacity of the electrode post 212.

[0084] Understandably, as the number of the first part 2121 increases, the welding area between the pole 212 and the electrode assembly 230 also increases, and the current carrying capacity of the pole 212 is also enhanced.

[0085] In some embodiments, the ratio of the area of ​​the first solder mark 21211 to the area of ​​the second solder mark 21231 ranges from 0.25 to 0.6. The value of this ratio can be 0.25, 0.3, 0.4, 0.5, 0.6, or any value between two adjacent values.

[0086] For example, the ratio of the area of ​​the first solder mark 21211 to the area of ​​the second solder mark 21231 ranges from 0.25 to 0.4.

[0087] By reasonably setting the ratio of the area of ​​the first solder mark 21211 to the area of ​​the second solder mark 21231, it can be ensured that the areas of the first solder mark 21211 and the second solder mark 21231 are both within a suitable range, so as to maximize the area of ​​the first solder mark 21211 and the second solder mark 21231, thereby improving the current carrying capacity of the electrode post 212 and improving the working performance of the battery cell 20.

[0088] In some embodiments, the ratio of the area of ​​the second solder mark 21231 to the area of ​​the end cap assembly 210 ranges from 0.08 to 0.4.

[0089] The value of this ratio can be 0.08, 0.1, 0.2, 0.3, 0.4, or any value between two adjacent values.

[0090] For example, the ratio of the area of ​​the second solder mark 21231 to the area of ​​the end cap assembly 210 ranges from 0.08 to 0.2.

[0091] By reasonably setting the ratio of the area of ​​the second solder mark 21231 to the area of ​​the end cap assembly 210, the area of ​​the second solder mark 21231 can be increased as much as possible without affecting the performance of the end cap assembly 210, so as to maximize the current carrying capacity of the pole post 212.

[0092] In some embodiments, the ratio of the area of ​​the first solder mark 21211 to the area of ​​the end cap assembly 210 ranges from 0.025 to 0.4.

[0093] The value of this ratio can be 0.025, 0.05, 0.2, 0.3, 0.4, or any value between two adjacent values.

[0094] For example, the ratio of the area of ​​the first solder mark 21211 to the area of ​​the end cap assembly 210 ranges from 0.025 to 0.1.

[0095] By reasonably setting the ratio of the area of ​​the first solder mark 21211 to the area of ​​the end cap assembly 210, the area of ​​the first solder mark 21211 can be increased as much as possible without affecting the performance of the end cap assembly 210, so as to maximize the current carrying capacity of the pole post 212.

[0096] In some embodiments, the battery cell 20 includes an adapter piece (not shown in the figure), one end of which is connected to a first solder mark 21211 and the other end is connected to a tab of the electrode assembly 230, or the first solder mark 21211 is directly soldered to the tab of the electrode assembly 230.

[0097] The adapter plate is used to connect the terminal post 212 and the electrode assembly 230 to ensure smooth current transmission and stable operation of the battery cell 20. The battery cell 20 provided in this application can be equipped with or without the adapter plate, depending on the situation.

[0098] When the battery cell 20 is equipped with an adapter piece, one end of the adapter piece is welded to the tab of the electrode assembly 230, and the other end is welded to the first solder mark 21211, which can reduce the overcurrent temperature of the battery cell 20.

[0099] When the adapter plate is removed from the battery cell 20, the first solder mark 21211 is directly soldered to the tab of the electrode assembly 230. This can improve the energy density when the battery cell 20 is in operation.

[0100] This configuration allows for the selection of whether or not to install an adapter plate, improving the flexibility of the components required for the battery cell 20 and expanding the application range of the battery cell 20.

[0101] like Figure 9 As shown, in some embodiments, perpendicular to the thickness direction of the end cap assembly 210, the width of the orthographic projection of the pole post 212 is L1, and the width of the end cap assembly 210 is L2, where 0.16 ≤ L1 / L2 ≤ 0.89. The ratio of L1 / L2 can be 0.16, 0.2, 0.4, 0.7, 0.89, or any value between two adjacent values.

[0102] By setting the L1 / L2 ratio appropriately, a reasonable gap can be ensured between the edge of the terminal post 212 and the end cap assembly 210, thereby improving the current carrying capacity of the terminal post 212 while ensuring the safety of the battery cell 20.

[0103] In some embodiments, the length of the orthographic projection of the pole post 212 perpendicular to the thickness direction of the end cap assembly 210 is L3, and the length of the end cap assembly 210 is L4, where 0.1 ≤ L3 / L4 ≤ 0.43. The ratio of L3 / L4 can be 0.1, 0.2, 0.3, 0.4, 0.43, or any value between two adjacent values.

[0104] By setting the L3 / L4 ratio appropriately, a reasonable gap can be maintained between the edge of the terminal post 212 and the end cap assembly 210, thereby ensuring the safety of the battery cell 20 while improving the current carrying capacity of the terminal post 212.

[0105] In some embodiments, the ratio of the width of the orthographic projection of the pole post 212 to the length of the orthographic projection of the pole post 212, perpendicular to the thickness direction of the end cap assembly 210, ranges from 1:1.3 to 1:15.

[0106] For example, such as Figure 5As shown, the width of the orthographic projection of pole post 212 is L1, and the length of the orthographic projection of pole post 212 is L3, where 1.3 ≤ L1 / L3 ≤ 15. The ratio of L1 / L3 can be 1.3, 5, 8, 12, 15, or any value between two adjacent values.

[0107] By reasonably setting the ratio of L1 / L3, the first solder mark 21211 and the second solder mark 21231 set on the terminal post 212 both meet the requirements and do not affect the use of the end cap assembly 210, thereby improving the overcurrent capacity of the terminal post 212 and ensuring the safety of the battery cell 20.

[0108] Some embodiments of this application also provide a battery device 100, which includes the battery cell 20 in the above embodiments. Therefore, the battery device 100 has the effects achieved by the battery cell 20.

[0109] Furthermore, some embodiments of this application also provide an electrical device that includes the battery device 100 described in the above embodiments. Therefore, the electrical device possesses the effects achieved by the battery device 100.

[0110] Specifically, in some embodiments, such as Figure 8 and Figure 10 As shown, the battery cell 20 includes a housing 220 and an end cap assembly 210. An electrode assembly 230 is housed inside the housing 220, and the end cap assembly 210 covers the housing 220. The end cap assembly 210 includes an end cap assembly 210 and a terminal post 212. A lower plastic part 216 is connected to the side of the end cap assembly 210 facing the electrode assembly 230. The terminal post 212 is disposed on the end cap assembly 210. Along the thickness direction of the end cap assembly 210, the terminal post 212 includes a first portion 2121, a second portion 2122, and a third portion 2123 stacked together. The second portion 2122 is connected to the end cap assembly 210, and the second portion 2122 connects to the first portion 2121 and the third portion 2123. The second part 2122 has two protruding cylinders, each cylinder is configured to form a first part 2121 with the same polarity. The surface of the first part 2121 facing away from the second part 2122 has a first solder mark 21211, and the surface of the third part 2123 facing away from the second part 2122 has a second solder mark 21231.

[0111] By setting the areas of the two solder marks to be equal, making the area of ​​the second solder mark 21231 larger than the area of ​​the first solder mark 21211, the welding area of ​​the electrode post 212 can be increased, the current carrying capacity of the electrode post 212 can be improved, thereby improving the current carrying capacity of the battery cell 20 and enhancing the working performance of the battery cell 20.

[0112] 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.

[0113] 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, The battery cell comprises: a shell comprising a shell body and an end cap assembly, an electrode assembly being accommodated in an interior of the shell body, the end cap assembly being combined with the shell body, the shell comprising a first wall; a pole post provided on the first wall; wherein, along a thickness direction of the end cap assembly, the pole post comprises oppositely arranged first and second surfaces, the first surface being arranged towards the interior of the shell body and having a first welding mark, the second surface being arranged towards the exterior of the shell body and having a second welding mark; an area of the second welding mark is greater than an area of the first welding mark.

2. The battery cell of claim 1, wherein, Along the thickness direction of the end cap assembly, the pole post comprises a first portion, a second portion and a third portion, the second portion being connected with the end cap assembly and being arranged between the first and third portions, a surface of the first portion away from the second portion being provided with the first welding mark, and a surface of the third portion away from the second portion being provided with the second welding mark.

3. The battery cell of claim 2, wherein, The first portion is configured as a cylindrical body and is protruded in a middle portion of the second portion; The third portion is configured as an elongated strip and is protruded in a middle portion of the second portion away from the first portion.

4. The battery cell of claim 3, wherein, The first portion is in a plurality, and all the first portions are protruded in the middle portion of the second portion.

5. The battery cell of claim 3, wherein, A ratio of the area of the first welding mark to the area of the second welding mark ranges from 0.25 to 0.

6.

6. The battery cell of claim 3, wherein, A ratio of the area of the second welding mark to the area of the end cap assembly ranges from 0.08 to 0.

4.

7. The battery cell of claim 3, wherein, A ratio of the area of the first welding mark to the area of the end cap assembly ranges from 0.025 to 0.

4.

8. The battery cell of any one of claims 1 to 7, wherein, The battery cell comprises a transition sheet, one end of the transition sheet being connected with the first welding mark and the other end being connected with a tab of the electrode assembly; or the first welding mark is directly welded with the tab of the electrode assembly.

9. The battery cell of any one of claims 1 to 7, wherein, Perpendicular to the thickness direction of the end cap assembly, a width of a projection of the pole post is L1, a width of the end cap assembly is L2, and 0.16≤L1 / L2≤0.

89.

10. The battery cell of any one of claims 1 to 7, wherein, Perpendicular to the thickness direction of the end cap assembly, a length of the projection of the pole post is L3, a length of the end cap assembly is L4, and 0.1≤L3 / L4≤0.

43.

11. The battery cell of any one of claims 1 to 7, wherein, Perpendicular to the thickness direction of the end cap assembly, a ratio of the width of the projection of the pole post to the length of the projection of the pole post ranges from 1:1.3 to 1:

15.

12. A battery device characterized by comprising: The battery device comprises the battery cell according to any one of claims 1-11.

13. An electrical device, comprising: The battery device comprises the battery cell according to claim 12.

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