Battery monomer, battery device and electric device

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly electrode terminal and a switching structure, and the shell is provided with a cavity; the shell comprises a first wall; the electrode terminal is provided with a substrate, an interval space is formed between at least one peripheral wall, forming an included angle with the second direction, in the substrate and the inner wall of the shell, and the size of the interval space in the second direction is larger than that of the tab in the second direction; the switching structure is located in the cavity and comprises a first part, a second part and a third part which are sequentially connected in the length direction of the first wall, and the third part and the first part are arranged in a staggered mode in the first direction and connected through the second part; projections of the third part and the first part on the shell in the second direction have an overlapping area. According to the battery monomer, the battery device and the power utilization device provided by the invention, the preparation difficulty of the electrode assembly can be reduced.

Description

Technical Field

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

[0002] Battery devices have a wide range of applications. The tabs are an important component of battery devices, but for shorter battery cells, the space for the tabs is limited, which makes the manufacturing process of the electrode assembly demanding and challenging. Utility Model Content

[0003] In view of the above problems, this application provides a battery cell, a battery device and an electrical device, which aims to reduce the manufacturing difficulty of the electrode assembly process.

[0004] In a first aspect, embodiments of this application provide a battery cell, including a casing, an electrode assembly, electrode terminals, and a connecting structure. The electrode assembly includes a main body and a tab, with at least one end of the main body connected to the tab along a first direction. The casing has a cavity, and the main body and the tab are both disposed within the cavity. The casing includes a first wall. The electrode terminals have a substrate located within the cavity. At least one outer peripheral wall of the substrate, which is angled to a second direction, forms a gap space with the inner wall of the casing. The size of the gap space in the second direction is larger than the size of the tab in the second direction. The second direction is perpendicular to the first direction and perpendicular to the length direction of the first wall. The connecting structure is located within the cavity and includes a first part, a second part, and a third part connected sequentially along the length direction of the first wall. The shape of the first part is adapted to the shape of the substrate, and the first part and the substrate are stacked and connected in the first direction. The third part is located between the tab and the first wall and is connected to the tab. The third part and the first part are offset in the first direction and connected through the second part. The projections of the third part and the first part onto the casing along the second direction have overlapping areas.

[0005] This battery device modifies at least the shape of the substrate and the adapter structure, such that the projections of the third and first portions of the adapter structure onto the casing along the second direction have overlapping areas. Thus, the portion of the adapter structure used for connecting to the tabs (i.e., the third portion) and the portion used for connecting to the electrode terminals (i.e., the first portion) are interconnected in the second direction. Consequently, a portion of the cavity enclosed by the casing originally intended for the electrode terminals can be used to accommodate at least some of the tabs, thereby increasing the space for tab placement within the battery device. This allows for more tab placement positions, permitting a wider range of processing errors during tab fabrication, and reducing the manufacturing difficulty of the electrode assembly to some extent.

[0006] In some embodiments, the electrode terminal has a substrate located in a cavity and connected to both a first portion and a first wall; the substrate is located on one side of the tab and has a first protrusion on the side of the substrate facing the tab, the first protrusion being disposed to avoid the tab, the first protrusion being used to increase the contact area between the substrate and the first wall; the adapter structure is provided with a first avoidance structure for avoiding the first protrusion; the first protrusion and the first avoidance structure are combined to form a combined structure, the combined structure being disposed to avoid the tab.

[0007] The first protrusion increases the contact area between the substrate and the first wall, which can improve the structural stability of the connection structure between the electrode terminal and the first wall to a certain extent. The first clearance structure ensures that the installation of the adapter structure is not affected by the first protrusion.

[0008] In some embodiments, the first clearance structure includes a second protrusion and a third protrusion. The shapes of the second and third protrusions are adapted to the shape of the first protrusion. The second protrusion is disposed in the first portion and stacked on top of the first protrusion. The third protrusion is disposed in the second portion and its edge is connected to the edge of the second protrusion. The two together form a receiving groove, which accommodates the first protrusion. The first clearance structure adopts the solution provided in this embodiment, which allows the flow area of ​​different regions of the transition structure to be the same, so that the flow capacity of the transition structure is not adversely affected by the setting of the first clearance structure.

[0009] In some embodiments, the first clearance structure includes a through structure that extends through the transition structure along a first direction to accommodate the first protrusion. The first clearance structure, using the solution provided in this embodiment, is simple in structure and easy to manufacture. Furthermore, the through structure reduces the flow area of ​​the transition structure in the region where the through structure is located, making it easier to melt and break at that point. This results in fusible portions forming on both sides of the through structure, which helps to disconnect the electrode terminals and tabs when the battery device temperature is too high, thereby improving the safety of the battery device.

[0010] In some embodiments, the shape of the through structure is adapted to the shape of the first protrusion. Due to the through structure, the flow area of ​​the transition structure at that location is reduced. By adopting the solution provided in this embodiment, the size of the through structure can be kept from being too large, and consequently, the volume of the portion with a smaller flow area in the transition structure can be kept from being too large, which helps to ensure the stable operation of the battery device.

[0011] In some embodiments, the same transition structure has two second parts and two third parts, with the second part and the third part corresponding to each other. The two third parts are spaced apart along the second direction, and each of the two third parts is connected to the first part through a corresponding second part. The connected third part and the second part form a combined part, and a first clearance structure is formed between the two combined parts. Using the solution provided in this embodiment, the transition structure can be integrally manufactured without the need for secondary drilling to create a through structure. Compared to setting a through structure, this simplifies the processing technology of the transition structure and reduces the amount of material used.

[0012] In some embodiments, the first protrusion has a second avoidance structure on at least one side facing the electrode tab, so that the assembled structure avoids the electrode tab. The second avoidance structure can be a slope, a groove, etc., as long as it can avoid the electrode tab. The provision of the second avoidance structure can reduce the risk of collision between the assembled structure and the electrode tab to a certain extent.

[0013] In some embodiments, the second avoidance structure includes a slope formed on the surface of the first protrusion, the slope being inclined along the length of the first wall from the end away from the substrate toward the end connected to the substrate toward the side where the corresponding tab is located. By adopting the arrangement of this embodiment, the slope and the inner wall of the housing can form a constricted structure with an opening area that gradually decreases toward the second part, thus avoiding the corners of the tab.

[0014] In some embodiments, the cross-section of the first protrusion is an isosceles trapezoid. This allows the first protrusion to avoid the corners of the tabs on both sides in the second direction, and both sides of the first protrusion are provided with inclined planes, which facilitates the tabs on the two electrode assemblies to enter the corresponding spaces under the guidance of the corresponding planes, and at the same time facilitates the processing and design of the first protrusion.

[0015] In some embodiments, two electrode assemblies are provided, and the two electrode assemblies are spaced apart along the second direction; in the same transition structure, the two sidewalls of the first part, which are arranged opposite to each other in the second direction, are both connected to the third part.

[0016] The solution provided in this embodiment allows multiple electrode components to be housed within a single casing, which helps improve the overall energy density of the battery device. This enables the battery device to store more energy within the same volume, thus providing higher power output. Two accommodating spaces can be formed between the same adapter structure and the main body, and these two spaces correspond to the tabs of the two electrode components. This increases the accommodating space for the tabs of both electrode components within the same casing, thereby reducing the fabrication difficulty of the tabs and consequently lowering the overall fabrication difficulty of the battery device.

[0017] In some embodiments, the first wall includes an end cap and an insulating member, the end cap being spaced apart from the electrode assembly; the insulating member is located on the side of the end cap facing the electrode assembly, and the insulating member is connected to the end cap via an electrode terminal; the side of the insulating member facing the substrate has a boss, the boss is located on one side of the tab, at least a portion of the boss is stacked with the substrate, and the shape of the side of the boss facing the tab is adapted to the shape of the side of the substrate facing the tab.

[0018] The presence of bosses increases the thickness and mechanical strength of the contact area between the insulation component and the substrate, reducing the risk of damage during processing or use. The side of the boss facing the tab is adapted to the shape of the substrate, which can, to some extent, avoid obstructing the tab installation and preventing any adverse effects from the boss's placement.

[0019] In some embodiments, a mounting groove is provided on the side of the boss facing the substrate. The shape of the mounting groove is adapted to the shape of the substrate, and the mounting groove is used to accommodate the substrate. The mounting groove can define the position of the substrate.

[0020] In some embodiments, the substrate includes a first half and a second half connected to each other, the second half being located on the side of the first half closer to the tab, and the cross-section of the second half being a semi-circular structure with a curved surface bulging towards the tab. The substrate using the structure provided in this embodiment has a simple structure and is easy to manufacture.

[0021] In some embodiments, the bottom of the mounting groove is provided with a reinforcing structure that contacts the second half. The reinforcing structure is used to strengthen the contact portion between the mounting groove and the second half. The reinforcing structure can enhance the connection strength between the second half and the insulating component, improve the structural stability of the insulating component at that point, and reduce the risk of damage.

[0022] In some embodiments, the reinforcing structure includes a plurality of arc-shaped protrusions spaced apart along the extending direction of the semi-circular structure. The reinforcing structure using the solution provided in this embodiment is simple in structure and easy to manufacture.

[0023] Secondly, embodiments of this application provide a battery device including multiple battery cells provided by any of the above solutions.

[0024] Thirdly, embodiments of this application provide an electrical device, including a battery cell or battery device provided by any of the above solutions.

[0025] The effects of the second and third aspects are the same as those of the first aspect, and will not be elaborated here.

[0026] 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

[0027] 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:

[0028] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0029] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0030] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0031] Figure 4 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0032] Figure 5 for Figure 4 A magnified schematic diagram of the local structure at point A;

[0033] Figure 6 This is a schematic diagram showing the positional relationship between the electrode tab and the adapter structure in related technologies;

[0034] Figure 7 A schematic diagram illustrating the positional relationship between the tabs and the adapter structure in a battery device provided in some embodiments of this application;

[0035] Figure 8 This is an exploded structural diagram of the electrode terminals, the connecting structure, and the first wall in a battery device provided in some embodiments of this application;

[0036] Figure 9 for Figure 8 Schematic diagram of the middle electrode terminal;

[0037] Figure 10 for Figure 8 A schematic diagram of the transition structure on the right side of the middle section;

[0038] Figure 11 for Figure 8 A schematic diagram of the structure of the insulating component from another perspective;

[0039] Figure 12 This is a schematic diagram of the structure of the electrode terminals in a battery cell provided in other embodiments of this application;

[0040] Figure 13 To and Figure 12 A schematic diagram of the adapter structure corresponding to the electrode terminals shown;

[0041] Figure 14 A partial structural schematic diagram of the insulating component in a battery cell provided in other embodiments of this application;

[0042] Figure 15 A partial structural schematic diagram of the assembly structure of the electrode terminals, the adapter structure, and the first wall in a battery device provided in other embodiments of this application;

[0043] Figure 16 This is a schematic diagram of the transfer structure in a battery cell provided in some other embodiments of this application.

[0044] The reference numerals in the detailed embodiments are as follows:

[0045] 1000, vehicles;

[0046] 100. Battery assembly; 200. Controller; 300. Motor;

[0047] 10. Housing; 11. Cover; 12. Tray; 20. Battery cell; 20a. Outer shell; 20b. First wall; 21. End cap; 22. Housing; 23. Electrode assembly; 231. Main body; 232. Electrode tab; 24. Insulator; 241. Boss; 242. Mounting groove; 243. Reinforcing structure; 243a. Arc-shaped protrusion; 25. Electrical connection assembly; 251. Electrode terminal; 2511. Substrate; 2511a. First half; 2511b. Second half; 2512. Through part; 2513. First protrusion; 252. Adapter structure; 2521. First part; 2522. Second part; 2523. Third part; 252a. First clearance structure; 2524. Second protrusion; 2525. Third protrusion; 2527. Through structure; 253. Sloping surface;

[0048] a. Accommodation space;

[0049] Z, first direction; X, length direction of the first wall; Y, second direction. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] In the description of the embodiments in this application, the term "and / or" is merely a description of 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0055] 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).

[0056] 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.

[0057] 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.

[0058] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0059] A typical battery cell has one positive electrode terminal and one negative electrode terminal, which are riveted to the end cap assembly of the battery cell. The positive electrode terminal is electrically connected to the positive tab of the electrode assembly within the battery cell via an adapter structure, and the negative electrode terminal is also electrically connected to the positive tab of the electrode assembly within the battery cell via an adapter structure. The positive and negative electrode terminals generally have the same structure, both having a base plate and a through-hole. The base plate is located inside the battery cell and connected to the adapter structure.

[0060] In related technologies, the substrate adopts a square structure, and the adapter structure adopts a "Z"-shaped structure. For battery cells with short lengths, the center distance between the positive and negative electrode terminals is small. The aforementioned structure of the substrate and adapter structure results in a small space available for placing the tabs between the adapter structure connected to the positive electrode terminal and the adapter structure connected to the negative electrode terminal. Because the position of the tabs is limited by the aforementioned space during the fabrication of the electrode assembly, the small space dimension leads to stringent manufacturing requirements and significant challenges in the electrode assembly process.

[0061] To address the aforementioned issues, this application provides a battery cell. This battery cell modifies at least the shape of the substrate and the adapter structure, such that the projections of the third and first portions of the adapter structure onto the casing along the second direction overlap. Thus, the portion of the adapter structure used for connecting to the tabs (i.e., the third portion) and the portion used for connecting to the electrode terminals (i.e., the first portion) are interconnected in the second direction. Consequently, the space within the cavity enclosed by the casing, originally intended for the electrode terminals, can be used to accommodate at least some of the tabs, thereby increasing the space available for tabs in the battery device. This allows for more tab placement positions, permitting a wider range of processing errors during tab fabrication, and reducing the manufacturing difficulty of the electrode assembly to some extent.

[0062] The battery cells disclosed in this application can be used in battery devices and electrical devices that use the battery cells as a power source, or in various energy storage devices, energy storage systems, and charging networks that use batteries as energy storage elements. Electrical devices can be, but are 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.

[0063] 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.

[0064] 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 apparatus 100 is provided inside the vehicle 1000, and the battery apparatus 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery apparatus 100 can be used to power the vehicle 1000. For example, the battery apparatus 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 apparatus 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0065] 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.

[0066] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10.

[0067] The housing 10 provides a storage space for the battery cells 20, and can adopt various structures. In some embodiments, the housing 10 may include a cover 11 and a tray 12. The cover 11 covers the tray, and together with the tray 12, defines a storage space for accommodating the battery cells 20. The tray 12 may be a hollow structure with one open end, and the cover 11 may be a plate-like structure, covering the open side of the tray 12 so that the cover 11 and the tray 12 together define the storage space; alternatively, both the cover 11 and the tray 12 may be hollow structures with one open end, with the open side of the cover 11 covering the open side of the tray 12. Of course, the housing 10 formed by the cover 11 and the tray 12 can be of various shapes, such as a circular through-hole or a cuboid. The tray 12 is an important structural support component in the battery system, used to store and protect the battery cells, and also has a significant impact on the collision safety of the vehicle and the overall torsional and bending stiffness of the vehicle body.

[0068] Multiple battery cells 20 can be provided, and these cells can be connected in series, parallel, or mixed connection via a busbar. Mixed connection refers to a configuration where multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or mixed connection, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or mixed connection to form a battery module, and then these battery modules are connected in series, parallel, or mixed connection to form a whole, which is also housed within the housing 10. The battery 100 may also include other structures; for example, it may include a busbar for electrical connection between the multiple battery cells 20. As an example, multiple battery cells 20 can form a battery module, which is an independent module formed by arranging and fixing multiple battery cells 20. As an example, a battery module can be formed by binding multiple battery cells 20 together with cable ties.

[0069] Each battery cell 20 can be a secondary battery or a primary battery. A secondary battery refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can have a circular through-body, a flat body, a cuboid, or other shapes.

[0070] 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 3The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0071] 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, giving battery cell 20 higher structural strength and improved safety performance. Functional components such as electrode terminals 251 can be provided on end cap 21. Electrode terminals 251 can be used for electrical connection with electrode assembly 23 for outputting or inputting electrical energy to 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 any 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.

[0072] 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, circular through-hole, 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.

[0073] Electrode assembly 23 is the component in the battery cell 100 where electrochemical reactions occur. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 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, while the portions of the positive and negative electrode sheets without active material each constitute a tab 232. 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 232 connect to the electrode terminals to form a current loop.

[0074] Please refer to Figure 4 , Figure 4 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application. The battery cell includes a housing 20a, an electrode assembly 23, electrode terminals 251, and a connecting structure 252. The electrode assembly 23 includes a main body 231 and tabs 232. At least one end of the main body 231 along a first direction Z is connected to a tab 232. The housing 20a has a cavity. Both the main body 231 and the tabs 232 are disposed within the cavity. The housing 20a includes a first wall 20b.

[0075] The electrode terminal 251 has a substrate 2511. The substrate 2511 is located within a cavity. At least one outer peripheral wall of the substrate 2511, which is angled to the second direction Y, forms a gap space with the inner wall of the housing 20a. The dimension of this gap space in the second direction Y is larger than the dimension of the electrode tab in the second direction Y. The second direction Y is perpendicular to the first direction Z and perpendicular to the length direction X of the first wall 20b.

[0076] The adapter structure 252 is located inside the cavity.

[0077] Figure 5 for Figure 4 A magnified view of the local structure at point A. (See diagram below.) Figure 5 As shown, the adapter structure 252 includes a first portion 2521, a second portion 2522, and a third portion 2523 connected sequentially along the length direction X of the first wall 20b. The shape of the first portion 2521 is adapted to the shape of the substrate 2511, and the first portion 2521 is stacked and connected to the electrode terminal 251 in the first direction. The third portion 2523 is located between the tab 232 and the first wall 20b, and is connected to the tab 232. The third portion 2523 and the first portion 2521 are offset in the first direction and connected through the second portion 2522. The projections of the third portion 2523 and the first portion 2521 onto the housing 20a along the second direction have overlapping areas. The second direction is perpendicular to the first direction and perpendicular to the length direction of the first wall 20b.

[0078] In this embodiment, the first direction Z is generally the height direction of the electrode assembly, but it can also be any other direction that forms an acute angle with the height direction of the electrode assembly. The length direction X of the first wall is generally perpendicular to the first direction Z, and can be the length direction of the electrode assembly, or any other direction that forms an acute angle with the length direction of the electrode assembly.

[0079] The outer casing 20a includes the end cap 21 and the housing 22 described above. As mentioned earlier, the end cap 21 and the housing 22 can be integrally formed or separately provided, depending on the application requirements. The first wall 20b can be either the end cap 21 or one of the side walls of the housing 22, depending on the application requirements.

[0080] Electrode terminals 251 are generally connected to the first wall 20b by riveting. A portion of the electrode terminal 251 is located within the cavity, while another portion extends through the first wall 20b to the outside of the cavity. Specifically, the electrode terminal 251 generally includes a substrate 2511 and a through portion 2512. The substrate 2511 is a plate within the cavity where the electrode terminal 251 is located, for contacting the side of the first wall 20b facing the electrode assembly 23. The through portion 2512 is the portion of the electrode terminal 251 excluding the substrate 2511. The through portion 2512 is located on the side of the substrate 2511 facing away from the electrode assembly and is connected to the substrate 2511. At least a portion of the through portion 2512 extends through the first wall 20b to the outside of the cavity. The portion of the through portion 2512 extending to the outside of the first wall 20b can be pressed into a sheet-like structure that cooperates with the substrate 2511 to clamp the first wall 20b using a riveting process. The substrate 2511 and the through portion 2512 can be an integrally formed structure or a separate connected structure.

[0081] The substrate 2511 may have one or more outer peripheral walls. An outer peripheral wall refers to an outer wall in the substrate 2511 whose extending direction is substantially parallel to the first direction Z. "Substantially parallel" means that the outer peripheral wall may be parallel to the first direction Z, or the angle between it and the first direction Z may be within 20°.

[0082] The adapter structure 252 is generally a partial structure, but it can also be a block or other structure depending on the application. In this embodiment, the adapter structure 252 can be a one-piece molded structure or a split connection structure. The first part 2521, the second part 2522, and the third part 2523 are all components of the adapter structure 252, and the three are arranged sequentially. The first part 2521 and the third part 2523 can be arranged parallel to each other or at an acute angle, depending on the application. The second part 2522 can be arranged perpendicular to the first part 2521 or at a certain angle to the first part 2521. The second part 2522 is generally attached to the electrode terminal 251, or there can be a certain gap between the second part 2522 and the electrode terminal 251.

[0083] The shape of the first part 2521 is adapted to the shape of the substrate 2511, meaning that the shape of at least one side of the first part 2521 facing the tab can be the same as or approximately the same as the shape of the side of the substrate 2511 facing the tab, so that the combined structure formed by stacking the first part 2521 and the substrate 2511 can at least partially avoid the tab in the second direction. "Approximately the same" means the same within a certain error range. This error can be determined according to the usage requirements. For example, when the shape of the side of the substrate 2511 facing the tab is an arc surface M1, and the shape of at least one side of the first part 2521 facing the tab is an arc surface M2, the error in the radius of curvature of the arc surface M1 and the arc surface M2 can be within 10%, 5%, or other numerical ranges.

[0084] In this embodiment, after the electrode terminals and the adapter structure are connected, the combined structure formed by the first part 2521 and the substrate 2511 can form a receiving space a with the inner wall of the outer shell 20a. The receiving space a is a space that accommodates at least a portion of the tabs 232.

[0085] In this embodiment, the tab 232 and the third part can completely overlap or partially overlap. When the tab 232 and the third part completely overlap, that is, when the projection of the tab 232 along the first direction Z can fall completely on the third part, the volume of the accommodating space a is generally larger than the volume of a single tab 232. At this time, the tab 232 can be completely located within the accommodating space a, or it can be partially located within the accommodating space a and the other part located outside the accommodating space a. When the tab 232 and the third part partially overlap, that is, when the projection of the tab 232 along the first direction Z only partially falls on the third part and the other part is located on the first wall 20b, the volume of the accommodating space a is generally smaller than the volume of a single tab 232. The tab 232 can generally only be partially located within the accommodating space a.

[0086] In this embodiment, the third part 2523 and the first part 2521 are staggered in the first direction Z, meaning that there is a height difference between them at least on the side closest to the electrode assembly 23 in the first direction Z. Besides being offset in the first direction Z, the first part 2521 and the third part 2523 may also be spaced apart in the length direction X of the first wall 20b, depending on their arrangement. Depending on the arrangement of the first part 2521 and the third part 2523, the second part 2522 can be a vertical structure extending along the first direction Z, or an inclined structure set at an acute angle to the first direction Z.

[0087] The third part 2523 and the first part 2521 have overlapping regions in the projection of the third part 2523 and the first part 2521 onto the outer shell 20a along the second direction Y, meaning that at least part of the structure of the third part 2523 extends into the aforementioned receiving space a enclosed by the first part 2521 and the inner wall of the outer shell 20a.

[0088] Figure 6 This is a schematic diagram illustrating the positional relationship between the electrode tab and the adapter structure in related technologies. It is understandable that... Figure 6 The middle electrode assembly is located on one side of the first wall to illustrate the positional relationship between the electrode tab and the adapter structure, not to show the final state of the product. For example... Figure 6 As shown, in related technologies, electrode terminals and a connecting structure constitute an electrical connection assembly 25. The substrate in contact with the connecting structure is square, making the side of the electrical connection assembly 25 facing the tab 232 a plane parallel to the second direction Y. The length of this plane is not significantly different from the width of the battery cell 20, preventing the tab from being accommodated between the electrical connection assembly 25 and the inner wall of the adjacent housing 22. Furthermore, the distance between the corresponding area of ​​the electrical connection assembly 25 and the substrate and the electrode assembly is small, making it impossible to accommodate the tab. Since two electrical connection assemblies 25 are typically provided in a battery cell 20, and since tabs cannot be provided at the first and second parts of the aforementioned connecting structure, the tab 232 can only be positioned between the second parts of the two electrical connection assemblies 25. Figure 6 As shown, theoretically, the relative position of the tab 232 to the electrical connection assembly 25 is the position enclosed by the solid line in the figure. In reality, during production, due to deviations in processing materials and processes, the position of the tab 232 may be to the left or right of the theoretical position described above. When the position of the tab 232 shifts to the left, the farthest point it can reach is... Figure 6 At the position indicated by the dashed line L3, the leftmost position of electrode 232 can be reached when it shifts to the left. Figure 6 At the location indicated by the dashed line L4, the area circled by the dashed box K1 in the diagram is the welding area between the tab 232 and the electrical connection assembly 25. When the tab 232 is offset to the far right, the welding area between the tab 232 and the electrical connection assembly 25 is the shaded area within the dashed box K1. Figure 6 As can be seen, the tab 232 on the left can be offset to the left at most until it abuts against the side wall of the electrical connection assembly, and the tab 232 on the right can be offset to the right at most until it abuts against the side wall of the electrical connection assembly. This means that when the distance between the second parts of the two electrical connection assemblies 25 is small, the space where the tab 232 can be placed is small, which leads to stringent manufacturing requirements and greater challenges for the electrode assembly 23.

[0089] Figure 7 This is a schematic diagram illustrating the positional relationship between the tabs and the adapter structure in a battery device provided in some embodiments of this application. For example... Figure 7As shown, the battery device 100 provided in this application embodiment changes the shape of the substrate 2511 and the adapter structure 252 in the electrode terminal 251, so that after the electrode terminal 251 and the adapter structure 252 are installed, the outer peripheral wall of the electrical connection assembly 25 formed by the two can form a receiving space a between it and the inner wall of the outer casing 20a at least on the side near the tab 232. The receiving space a allows at least a portion of the tab to be inserted. Thus, in... Figure 7 In the structure shown, when the tab 232 on the right side is offset to the right, the rightmost position it can reach is no longer the position indicated by the dotted line L5 in the figure. Instead, part of the tab 232 can enter the receiving space a between the electrical connection assembly 25 and the inner wall of the housing 20a. That is, when the tab 232 on the right side is offset to the right, the rightmost position it can reach can reach the position indicated by the dotted line L6 in the figure. This allows the size of the space in the battery device that accommodates the tab 232 in the length direction X of the first wall to increase by a. And when the size of the tab 232 in the second direction Y is smaller, it can also reach the right side of L4.

[0090] Therefore, by using the battery device provided in this application embodiment, the space for placing the tab 232 in the battery cell can be increased to a certain extent, thereby increasing the number of positions for the tab 232. This allows for a larger range of processing errors during the processing of the tab 232, and can reduce the manufacturing difficulty of the electrode assembly 23 to a certain extent.

[0091] In addition, by adopting the solution provided in the embodiments of this application, since the space for placing the tab 232 in the battery cell is increased, a larger tab 232 can be set to reduce the risk of the tab 232 melting.

[0092] In the above embodiments, at least a portion of the side of the electrical connection component 25 facing the tab is an arc-shaped surface.

[0093] In the above embodiments, the portions of the second and third parts located within the aforementioned accommodating space a can both be adapted to the shape of the substrate, or only partially adapted to the shape of the substrate, as long as the combined structure consisting of the adapter structure and the substrate can avoid the tabs in the second direction.

[0094] Since a sealing ring is generally required between the electrical connection component and the first wall, at least a portion of the side of the electrical connection component 25 facing the tab is an arc-shaped surface. This allows the arc-shaped portion of the electrical connection component 25 to match the outer contour of the sealing ring, without affecting the sealing effect between the electrical connection component 25 and the sealing ring, and thus without affecting the sealing of the battery cell.

[0095] like Figure 9 and Figure 10As shown, in some embodiments, the substrate 2511 is located on one side of the tab 232, and a first protrusion 2513 is provided on the side of the substrate 2511 facing the tab 232. The first protrusion 2513 is disposed to avoid the tab 232. The first protrusion 2513 is used to increase the contact area between the substrate 2511 and the first wall 20b. The transition structure 252 is provided with a first avoidance structure 252a for avoiding the first protrusion 2513. The first protrusion 2513 and the first avoidance structure 252a are combined to form a combined structure. The combined structure is disposed to avoid the tab.

[0096] The substrate 2511 is a plate in which the electrode terminals 251 are located in the cavity and are used to contact the side of the first wall 20b facing the electrode assembly 23.

[0097] The first protrusion 2513 extends along the extension direction of the substrate 2511 and is a part of the substrate 2511. The cross-sectional shape of the first protrusion 2513 can be semi-circular, trapezoidal, triangular, etc., depending on the application requirements.

[0098] In this embodiment, the first clearance structure 252a can be a groove structure that engages with the first protrusion 2513, or a through hole, notch, or other structure through which the first protrusion 2513 passes, depending on the specific application requirements. The first clearance structure 252a is used to avoid the first protrusion 2513, so that the installation of the adapter structure 252 is not affected by the first protrusion 2513.

[0099] The combined structure is a solid structure composed of a first clearance structure 252a and a first protrusion 2513. Depending on the type of the first clearance structure 252a, the outer contour of the combined structure can be equal to or larger than the outer contour of the first protrusion 2513. For example, when the first clearance structure 252a is a groove structure, it covers the first protrusion 2513, and the outer contour of the protrusion is larger than that of the first protrusion 2513. When the first clearance structure 252a is a through hole, notch, or other structure through which the first protrusion 2513 passes, the outer contour of the combined structure is the same as or equal to that of the first protrusion 2513.

[0100] The first protrusion 2513 increases the contact area between the substrate 2511 and the first wall 20b, which can improve the structural stability of the connection structure between the electrode terminal 251 and the first wall 20b to a certain extent. The first clearance structure 252a ensures that the installation of the adapter structure 252 is not affected by the first protrusion 2513.

[0101] In some embodiments, the first clearance structure 252a includes a second protrusion 2524 and a third protrusion 2525. The shapes of the second protrusion 2524 and the third protrusion 2525 are both adapted to the shape of the first protrusion 2513. The second protrusion 2524 is disposed in the first portion 2521 and is stacked on top of the first protrusion 2513. The third protrusion 2525 is disposed in the second portion 2522, and the third protrusion 2525 is connected to the edge of the second protrusion 2524. The two together form a receiving groove. The receiving groove accommodates the first protrusion.

[0102] The shapes of the second protrusion 2524 and the third protrusion 2525 are adapted to the shape of the first protrusion, meaning that the shape of the second protrusion 2524 is the same as or approximately the same as the shape of the first protrusion, and the third protrusion 2525 is bent around the side of the first protrusion away from the substrate 2511. The sidewall of the receiving groove formed by the two is in close contact or almost in close contact with the sidewall of the first protrusion. Almost in close contact means that the sidewall of the receiving groove is in close contact with the first protrusion or there is a gap, the size of which is less than or equal to the processing error, such as less than or equal to 2 mm or 1 mm.

[0103] The first clearance structure 252a adopts the solution provided in this embodiment, so that the flow area of ​​different regions of the transition structure 252 can be the same, so that the flow capacity of the transition structure 252 is not adversely affected by the setting of the first clearance structure 252a.

[0104] Figure 15 This is a partial structural diagram of the assembly structure of the electrode terminals, the transition structure, and the first wall in a battery device provided for other embodiments of this application. (See attached diagram.) Figure 15 As shown, in some embodiments, the first clearance structure 252a includes a through structure 2527. The through structure 2527 extends through the transition structure 252 along a first direction Z to accommodate the first protrusion 2513.

[0105] The through structure 2527 can be a through hole or a notch, depending on the application requirements.

[0106] The first clearance structure 252a adopts the solution provided in this embodiment, which is simple in structure and easy to manufacture. In addition, the setting of the through structure 2527 will reduce the flow area of ​​the transition structure 252 in the region where the through structure 2527 is located, making it easier to melt and break at that point. That is, a melt-breaking part will be formed on both sides of the through structure 2527. This helps to disconnect the electrode terminal 251 and the tab when the battery device temperature is too high, thereby helping to improve the safety of the battery device.

[0107] In some embodiments, the shape of the through structure 2527 is adapted to the shape of the first protrusion 2513.

[0108] The shape of the through structure 2527 is adapted to the shape of the first protrusion 2513, meaning that the through structure 2527 only needs to make the first protrusion 2513 completely exposed on the side of the tab 232, and does not need to be too large.

[0109] Because of the through structure 2527, the flow area of ​​the transition structure 252 at that location is reduced. By adopting the solution provided in this embodiment, the size of the through structure 2527 can be kept from being too large, and the volume of the part with a smaller flow area in the transition structure 252 can be kept from being too large, which helps the battery device 100 to work stably.

[0110] Figure 16 This is a schematic diagram of the transfer structure in a battery device provided in other embodiments of this application. For example... Figure 16 As shown, in some embodiments, two second portions 2522 and two third portions 2523 are provided in the same transition structure 252. The second portions 2522 and the third portions 2523 are correspondingly arranged. The two third portions 2523 are spaced apart along the second direction Y, and the two third portions 2523 are respectively connected to the first portion 2521 through the corresponding second portions 2522. The connected third portions 2523 and the second portions 2522 form a combined portion. A first clearance structure 252a is formed between the two combined portions.

[0111] The interval setting refers to the existence of a certain size gap between the two third parts 2523, and the width of the gap between the two parts is greater than the width of the first protrusion 2513.

[0112] The solution provided in this embodiment allows the adapter structure 252 to be fabricated integrally without the need for secondary drilling to obtain the through structure 2527. Compared with setting the through structure 2527, the processing technology of the adapter structure 252 can be simplified and the amount of material used in the adapter structure 252 can be reduced.

[0113] In some embodiments, at least one side of the first protrusion facing the electrode tab is provided with a second clearance structure so that the combined structure avoids the electrode tab.

[0114] The second clearance structure can be a slope, groove, or anything else that can avoid the electrode tab. The second clearance structure can reduce the risk of collision between the combined structure and the electrode tab 232 to a certain extent.

[0115] like Figure 9 As shown, in some embodiments, the second clearance structure includes a ramp 253 formed on the side of the first protrusion 2513. The ramp 253 slopes along the length X of the first wall from the end away from the substrate toward the end connected to the substrate toward the side where the corresponding tab is located.

[0116] The inclined plane 253 can be a plane with an inclination or a curved surface with an inclination, depending on the application requirements.

[0117] The inclined surface 253, as configured in this embodiment, forms a narrowing structure between the inclined surface 253 and the inner wall of the outer shell 20a, with the opening area gradually decreasing towards the second part, thus avoiding the corner of the electrode tab.

[0118] In some embodiments, the cross-section of the first protrusion is an isosceles trapezoid.

[0119] This allows the first protrusion to avoid the corners of the tabs on both sides in the second direction, and both sides of the first protrusion are provided with inclined planes, which facilitates the tabs on the two electrode assemblies to enter the corresponding space under the guidance of the corresponding planes, and at the same time facilitates the processing and design of the first protrusion.

[0120] In some embodiments, two electrode assemblies 23 are provided, and the two electrode assemblies 23 are spaced apart along the second direction Y. In the same transition structure 252, the two sidewalls of the first part 2521, which are arranged opposite to each other in the second direction, are connected to the third part 2523.

[0121] The battery device 100 is generally a cuboid or similar cuboid structure, therefore the outer casing 20a is also generally a cuboid or similar cuboid structure, having length, width and height directions.

[0122] By adopting the solution provided in this embodiment, multiple electrode components 23 can be arranged within a single outer casing 20a, which helps to improve the overall energy density of the battery device 100. This allows the battery device 100 to store more energy in the same volume, enabling it to provide higher power output. Two receiving spaces a can be formed between the same transition structure and the main body, and these two receiving spaces a correspond to the tabs 232 of the two electrode components 23. This allows the receiving space a of the tabs 232 of the two electrode components 23 within the same outer casing 20a to be increased, thereby reducing the manufacturing difficulty of the tabs 232 of the two electrode components 23 and thus reducing the manufacturing difficulty of the battery device 100.

[0123] Figure 8 This is an exploded structural diagram of the electrode terminals, the adapter structure, and the first wall in a battery device provided in some embodiments of this application. Figure 9 for Figure 8 Schematic diagram of the middle electrode terminal. Figure 10 for Figure 8 A schematic diagram of the intermediate transfer structure. (See diagram below.) Figures 8 to 10As shown, in some embodiments, the electrical connection assembly 25 includes electrode terminals 251 and a transition structure 252. The electrode terminals 251 include a substrate 2511 and a through portion 2512 sequentially connected along a first direction Z. The substrate 2511 is located within a cavity. The through portion 2512 is disposed on the side of the substrate 2511 opposite to the electrode assembly 23. At least a portion of the through portion 2512 extends through the first wall 20b to the outside of the cavity. The transition structure 252 is located within the cavity. The transition structure 252 includes a first portion 2521, a second portion 2522, and a third portion 2523 sequentially connected. The first portion 2521 is stacked and connected to the substrate 2511 along the first direction Z. The third portion 2523 is offset from the first portion 2521 along the first direction Z and is connected to the first portion 2521 via the second portion 2522. The third part 2523 is stacked and connected to the electrode in the first direction Z, and the third part 2523 is located between the electrode and the first wall 20b.

[0124] At least a portion of the side of the substrate 2511 facing the tab is an arc-shaped surface M2. The shape of the side of the first portion 2521 facing the tab and the shape of the side of the second portion 2522 facing the tab are adapted to the shape of the side of the substrate 2511 facing the tab.

[0125] Electrode terminals 251 are typically connected to the first wall 20b via riveting. The substrate 2511 is a plate within the cavity where the electrode terminals 251 are located, used to contact the side of the first wall 20b facing the electrode assembly 23. The through-hole 2512 is the portion of the electrode terminal 251 excluding the substrate 2511. The portion of the through-hole 2512 extending to the outside of the first wall 20b can be pressed into a sheet-like structure that cooperates with the substrate 2511 to clamp the first wall 20b using a riveting process. The substrate 2511 and the through-hole 2512 can be an integrally formed structure or separate connected structures.

[0126] In this embodiment, the adapter structure 252 can be either a one-piece molded structure or a split connection structure. The first part 2521, the second part 2522, and the third part 2523 are all components of the adapter structure 252, and are arranged sequentially. The first part 2521 and the third part 2523 can be arranged parallel to each other or at an acute angle, depending on the application requirements. The second part 2522 can be arranged perpendicular to the first part 2521 or at a certain angle to it. The second part 2522 is generally attached to the substrate 2511, but there may also be a certain gap between it and the substrate 2511. The side of the second part 2522 facing the tab is at least partially an arc-shaped surface M1.

[0127] The shapes of the first part 2521 facing the tab and the second part 2522 facing the tab are adapted to the shape of the substrate 2511 facing the tab. This means that the shape of the first part 2521 facing the tab can be the same as or approximately the same as the shape of the substrate 2511 facing the tab, and the shape of the second part 2522 facing the tab can be the same as or approximately the same as the shape of the substrate 2511 facing the tab. "Approximately the same" means within a certain error range. This error can be determined according to the usage requirements. For example, the error in the radius of curvature of the curved surface M1 and the curved surface M2 can be within 10%, 5%, or other numerical ranges.

[0128] The side of the substrate 2511 facing the tab can be entirely curved or partially curved, as long as the curved surface of the combined structure formed by the substrate 2511, the first part 2521 and the second part 2522 can form the aforementioned receiving space a with the inner wall of the outer shell 20a.

[0129] The electrical connection component 25 adopts the structure provided in this embodiment, which is simple and easy to manufacture and assemble.

[0130] like Figure 8 and Figure 11 As shown, Figure 11 for Figure 8 In another perspective, the schematic diagram shows that in some embodiments, the first wall 20b includes an end cap 21 and an insulating member 24. The end cap 21 is spaced apart from the electrode assembly 23. The insulating member 24 is located on the side of the end cap 21 facing the electrode assembly 23 and is connected to the end cap 21 via an electrode terminal 251. A boss 241 is provided on the side of the insulating member 24 facing the substrate 2511. The boss 241 is located on one side of the electrode tab. At least a portion of the boss 241 is stacked with the substrate 2511, and the shape of the side of the boss 241 facing the electrode tab is adapted to the shape of the side of the substrate 2511 facing the electrode tab.

[0131] In this embodiment, the end cap 21 can be made of metal, composite materials, etc. The insulating component 24 can be made of rubber, composite materials, etc. The insulating component 24 enables electrical isolation between the end cap 21 and the electrode assembly 23.

[0132] The boss 241 can be integrally formed on the insulating member 24, or it can be separately disposed from the insulating member 24 and mounted on the insulating member 24. Along the first direction Z, the projected area of ​​the boss 241 on the end cap 21 is generally larger than the projected area of ​​the substrate 2511 on the end cap 21. Most of the portion of the boss 241 that extends beyond the substrate 2511 extends in a direction away from the tab.

[0133] The length of the side of the boss 241 facing the tab is generally greater than the length of the side of the substrate 2511 facing the tab. The shape of the side of the boss 241 facing the tab and the shape of the side of the substrate 2511 facing the tab are matched, meaning that the corresponding parts of the side of the boss 241 facing the tab and the side of the substrate 2511 facing the tab have the same or approximately the same shape.

[0134] The protrusion 241 increases the thickness and mechanical strength of the contact area between the insulating member 24 and the substrate 2511, reducing the risk of damage during processing or use. The side of the protrusion 241 facing the tab is adapted to the shape of the substrate 2511, which can avoid the tab to a certain extent, so that the protrusion 241 does not adversely affect the installation of the tab.

[0135] In some embodiments, the side of the boss 241 facing the substrate 2511 is provided with a mounting groove 242. The shape of the mounting groove 242 is adapted to the shape of the substrate 2511. The mounting groove 242 is used to accommodate the substrate 2511.

[0136] The depth of the mounting groove 242 can be greater than the thickness of the substrate 2511, less than the thickness of the substrate 2511, or equal to the thickness of the substrate 2511, depending on the installation requirements.

[0137] The shape of the mounting groove 242 is adapted to the shape of the substrate 2511, meaning that the shape of the mounting groove 242 is the same as or approximately the same as the shape of the substrate 2511.

[0138] The mounting slot 242 can limit the position of the substrate 2511.

[0139] Figure 12 This is a schematic diagram of the structure of the electrode terminals in a battery cell provided in other embodiments of this application, such as... Figure 9 and Figure 12 As shown, the dashed line L7 in the figure is the boundary line between the first half 2511a and the second half 2511b. In some embodiments, the substrate 2511 includes the first half 2511a and the second half 2511b that are connected to each other. It is understood that the dashed line L7 is only an auxiliary line to facilitate understanding of the boundary position between the first half 2511a and the second half 2511b, and is not a structural line of the substrate 2511.

[0140] The second half 2511b is located on the side of the first half 2511a near the tab, and the cross-section of the second half 2511b is a semi-circular structure with a curved surface protruding towards the tab 232.

[0141] In this embodiment, the cross-section of the first half 2511a can be rectangular, trapezoidal, or other structures, depending on the application requirements. The substrate 2511 can be a one-piece molded structure or a split-connected structure.

[0142] The first half 2511a and the second half 2511b are both components of the substrate 2511. They can be separated by the axis of symmetry of the through portion 2512 or by other means.

[0143] The substrate 2511 adopts the structure provided in this embodiment, which is simple and easy to manufacture.

[0144] Understandably, substrate 2511 uses Figure 12 The structure shown is different from the one used. Figure 9 The structure shown is easier to mold. Figure 13 To and Figure 12 The diagram shows the structural schematic of the adapter structure corresponding to the electrode terminals. (Using...) Figure 13 The adapter structure shown is different from the one used. Figure 10 The adapter structure shown is also easy to mold.

[0145] Figure 14 This is a partial structural diagram of the insulating component in a battery cell provided in other embodiments of this application. For example... Figure 14 As shown, in some embodiments, the bottom of the mounting groove 242 is provided with a reinforcing structure 243 that contacts the second half 2511b. The reinforcing structure 243 is used to strengthen the contact portion between the mounting groove 242 and the second half.

[0146] The reinforcing structure 243 can be a protrusion formed on the bottom of the mounting groove 242, such as a protruding ridge or a protrusion, or it can be a part or block embedded in the bottom of the groove, or other structures, as long as the reinforcing structure 243 can increase the strength of the contact part between the mounting groove 242 and the second half.

[0147] The reinforcement structure 243 can enhance the connection strength between the second half and the insulating part 24, improve the structural stability of the insulating part 24 at that point, and reduce the risk of damage to it.

[0148] In some embodiments, the reinforcing structure 243 includes a plurality of arcuate protrusions 243a spaced apart along the extending direction of the semicircular structure.

[0149] The arc-shaped protrusion 243a can be a protrusion formed on the bottom of the mounting groove 242, such as a ridge or a block, or it can be a part or block embedded in the bottom of the groove, or other structures, depending on the application requirements. A groove can be formed between two adjacent arc-shaped protrusions 243a to allow the protrusion on the sealing ring to be inserted, thereby defining the position of the sealing ring.

[0150] The reinforcing structure 243 adopts the solution provided in this embodiment, which has a simple structure and is easy to prepare.

[0151] According to some embodiments of this application, this application also provides an electrical device, including a battery cell or battery device provided by any of the above solutions. The battery cell or battery device is used to provide electrical energy.

[0152] The electrical device can be any of the aforementioned battery-powered devices or systems.

[0153] The electrical device provided in this application embodiment includes the above-mentioned battery cell or battery device, and can achieve the same effect, which will not be described in detail here.

[0154] like Figures 3 to 16 As shown, one embodiment of this application provides a battery device, relating to the fields of power batteries, energy storage batteries, and mechanical devices. The battery device includes a housing 20a, an electrode assembly 23, electrode terminals 251, and a connecting structure 252. The housing 20a has a first wall 20b. The electrode assembly 23 is disposed within a cavity and includes a main body 231 and tabs 232. At least one end of the main body 231 along the height direction Z of the electrode assembly 23 is connected to the tabs 232.

[0155] The electrode terminal 251 has a substrate 2511. The substrate 2511 is located in the cavity. The side of the substrate 2511 facing the tab is an arc-shaped surface, which is disposed to avoid the tab 232 in the second direction Y.

[0156] The adapter structure 252 is located inside the cavity. Figure 5 for Figure 4 A magnified view of the local structure at point A. (See diagram below.) Figure 5As shown, the adapter structure 252 includes a first portion 2521, a second portion 2522, and a third portion 2523 connected sequentially along the length direction X of the first wall 20b. The shape of the first portion 2521 is adapted to the shape of the substrate 2511, and the first portion 2521 is stacked and connected to the electrode terminal 251 in the first direction. The third portion 2523 is located between the tab 232 and the first wall 20b, and is connected to the tab 232. The third portion 2523 and the first portion 2521 are offset in the first direction and connected through the second portion 2522. The projections of the third portion 2523 and the first portion 2521 onto the housing 20a along the second direction have overlapping areas. The second direction is perpendicular to the first direction and perpendicular to the length direction of the first wall 20b.

[0157] The first portion 2521, the second portion 2522, and the third portion 2523 of the transition structure are at least partially adapted in shape to the shape of the arcuate surface at their corresponding portions, such that the second portion 2522 of the transition structure and the inner wall of the housing enclose at least one receiving space a. At least a portion of the receiving space a is located on one side of the centerline of the first portion 2521 in the length direction of the first wall.

[0158] At least a portion of the tab 232 is located within the receiving space a.

[0159] The outer casing 20a includes the aforementioned end cap 21 and housing 22. The end cap 21 is the first wall 20b. Two electrode assemblies 23 are provided, and the two electrode assemblies 23 are spaced apart along the second direction Y. The same arcuate surface, the side of the second part facing the main body 231, and the side of the main body 231 facing the electrical connection assembly 25 form two receiving spaces a. The two receiving spaces a are interconnected, and the two receiving spaces a correspond to the tabs 232 of the two electrode assemblies 23.

[0160] The electrical connection assembly 25 includes electrode terminals 251 and a transition structure 252. The electrode terminals 251 include a substrate 2511 and a through portion 2512 sequentially connected along the height direction Z of the electrode assembly. The substrate 2511 is located within a cavity. The through portion 2512 is located on the side of the substrate 2511 opposite to the electrode assembly 23. At least a portion of the through portion 2512 extends through the first wall 20b to the outside of the cavity. The transition structure 252 is located within the cavity. The transition structure 252 includes a first portion 2521, a second portion 2522, and a third portion 2523 sequentially connected. The first portion 2521 is stacked and connected to the substrate 2511. The third portion 2523 is offset from the first portion 2521 in the height direction of the electrode assembly 23 and connected to the first portion 2521 via the second portion 2522. The third portion 2523 is stacked and connected to a tab, and the third portion 2523 is located between the tab and the first wall 20b. Part 2522 is located on one side of the electrode.

[0161] At least a portion of the side of the substrate 2511 facing the tab is an arc-shaped surface. The shape of the side of the first portion 2521 facing the tab and the shape of the side of the second portion 2522 facing the tab are adapted to the shape of the side of the substrate 2511 facing the tab.

[0162] The first wall 20b includes an end cap 21 and an insulating member 24. The end cap 21 is spaced apart from the electrode assembly 23. The insulating member 24 is located on the side of the end cap 21 facing the electrode assembly 23 and is connected to the end cap 21 via an electrode terminal 251. A boss 241 is provided on the side of the insulating member 24 facing the substrate 2511. The boss 241 is located on one side of the tab. At least a portion of the boss 241 is stacked with the substrate 2511, and the shape of the side of the boss 241 facing the tab is adapted to the shape of the side of the substrate 2511 facing the tab.

[0163] The boss 241 has a mounting groove 242 on the side facing the substrate 2511. The shape of the mounting groove 242 is adapted to the shape of the substrate 2511. The mounting groove 242 is used to accommodate the substrate 2511.

[0164] The substrate 2511 includes a first half 2511a and a second half 2511b that are connected to each other. It is understood that the dashed line L5 mentioned above is only an auxiliary line to facilitate understanding of the boundary position between the first half 2511a and the second half 2511b, and is not a structural line of the substrate 2511.

[0165] The bottom of the mounting groove 242 is provided with a reinforcing structure 243 that contacts the second half 2511b. The reinforcing structure 243 is used to strengthen the contact portion between the mounting groove 242 and the second half. The reinforcing structure 243 includes a plurality of arc-shaped protrusions 243a spaced apart along the extension direction of the arc-shaped surface.

[0166] like Figure 9 and Figure 10 As shown, in some embodiments, the substrate 2511 has a first protrusion 2513 on the side facing the tab 232. The first protrusion 2513 is disposed to avoid the tab 232. The first protrusion 2513 is used to increase the contact area between the substrate 2511 and the first wall 20b. The transition structure 252 is provided with a first avoidance structure 252a for avoiding the first protrusion 2513. The first protrusion 2513 and the first avoidance structure 252a are combined to form a protrusion. The protrusion is located between two receiving spaces a corresponding to the same arcuate surface and is disposed to avoid the tab.

[0167] In some embodiments, the first clearance structure 252a includes a second protrusion 2524 and a third protrusion 2525. The shapes of the second protrusion 2524 and the third protrusion 2525 are adapted to the shape of the first protrusion. The second protrusion 2524 is disposed in the first portion 2521 and is stacked on top of the first protrusion 2513. The third protrusion 2525 is disposed in the second portion 2522 and is connected to the edge of the second protrusion 2524. Together, they form a receiving groove. The receiving groove accommodates the first protrusion.

[0168] Figure 15 This is a partial structural diagram of the assembly structure of the electrode terminals, the transition structure, and the first wall in a battery device provided for other embodiments of this application. (See attached diagram.) Figure 15 As shown, in some embodiments, the first clearance structure 252a includes a through structure 2527. The through structure 2527 extends through the transition structure 252 along the thickness direction Z to accommodate the first protrusion 2513. The shape of the through structure 2527 is adapted to the shape of the first protrusion 2513.

[0169] Figure 16 This is a schematic diagram of the transfer structure in a battery device provided in other embodiments of this application. For example... Figure 16 As shown, in some embodiments, two second portions 2522 and two third portions 2523 are provided in the same transition structure 252. The second portions 2522 and the third portions 2523 are correspondingly arranged. The two third portions 2523 are spaced apart along the second direction Y, and the two third portions 2523 are respectively connected to the first portion 2521 through the corresponding second portions 2522. The connected third portions 2523 and the second portions 2522 form a combined portion. A first clearance structure 252a is formed between the two combined portions.

[0170] The cross-section of the first protrusion 2513 is an isosceles trapezoid.

[0171] For conventional riveted top cover square cells with relatively extreme dimensions (small cell width, small thickness, and small terminal center distance) (such as the 26165 square cell with a terminal center distance of 111), the terminal base plate is square, and the transition structure uses a "Z" shaped bending transition structure. The space available between the terminals for placing the tabs is very small (for example, some battery devices only leave 6mm of space for the tabs to be offset to both sides), which places stringent requirements on the manufacturing process of the cells and poses a great challenge.

[0172] The battery device provided in this embodiment changes the substrate shape of the electrode terminals to a structure of rectangular plate + semi-circular plate + trapezoidal plate. This substrate can ensure a sufficiently large compression surface between itself and the sealing ring while minimizing the need to accommodate the electrode tabs. The trapezoidal plate (i.e., the aforementioned first protrusion) serves to provide a support surface during the riveting operation of the electrode terminals. The choice of a trapezoidal shape instead of a rectangle is also to minimize the radius (R) of the electrode tabs. The design of the bosses and mounting grooves on the insulating component is adapted to the shape of the substrate.

[0173] In related technologies, the two corner areas of the substrate near the tabs occupy the space for tab arrangement. The battery device provided in this application uses a curved surface on the substrate at these corners, freeing up the aforementioned arrangement space and increasing the space for tab arrangement. In this embodiment, the shape of the adapter structure is also adapted to the substrate to avoid corresponding protrusions on the substrate and insulating components while maximizing space for tab arrangement.

[0174] Using the battery device provided in this embodiment, if the electrode assembly is not further thickened, and if the process is improved so that the ultrasonic welding can be moved outward in the thickness direction of the electrode assembly, the space reserved for the tab arrangement can also be made larger.

[0175] The insulating component has two quarter-circular surfaces (i.e., the aforementioned arc-shaped protrusions) in the mounting substrate area, which serve to provide a supporting surface for the substrate during electrode terminal riveting. A groove can be formed between two adjacent annular surfaces to allow the protrusions on the sealing ring to be inserted, thereby defining the position of the sealing ring.

[0176] 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 by, The electrode assembly comprises a main body and a tab, the main body is connected with the tab at at least one end in a first direction; The shell has a cavity, the main body and the tab are arranged in the cavity; the shell comprises a first wall; and The electrode terminal has a substrate, the substrate is arranged in the cavity, at least one peripheral wall of the substrate is arranged at an angle with a second direction, and a spacing space is formed between the peripheral wall and an inner wall of the shell, a size of the spacing space in the second direction is greater than a size of the tab in the second direction; the second direction is perpendicular to the first direction and perpendicular to a length direction of the first wall; And The adapter structure is arranged in the cavity, the adapter structure comprises a first part, a second part and a third part connected in sequence along the length direction of the first wall, a shape of the first part is matched with a shape of the substrate, and the first part is arranged in a stack with the substrate in the first direction and connected; The third part is arranged between the tab and the first wall and connected with the tab; the third part and the first part are arranged in a staggered manner in the first direction and connected through the second part; projections of the third part and the first part on the shell in the second direction have an overlapping area. The substrate is arranged on one side of the tab, and a first protrusion is arranged on a side of the substrate facing the tab, the first protrusion is arranged to avoid the tab, and the first protrusion is used to increase a contact area of the substrate and the first wall; a first avoiding structure is arranged on the adapter structure to avoid the first protrusion; the first protrusion and the first avoiding structure form a combined structure which avoids the tab.

2. The battery cell of claim 1, wherein, The first avoiding structure comprises a second protrusion and a third protrusion, shapes of the second protrusion and the third protrusion are matched with a shape of the first protrusion, the second protrusion is arranged in the first part and arranged in a stack with the first protrusion, and the third protrusion is arranged in the second part and connected with an edge of the second protrusion, and the second protrusion and the third protrusion form a containing groove.

3. The battery cell of claim 2, wherein, The first avoiding structure comprises a through structure, the through structure penetrates the adapter structure in the first direction to contain the first protrusion.

4. The battery cell of claim 2, wherein, The shape of the through structure is matched with the shape of the first protrusion.

5. The battery cell of claim 4, wherein the cathode comprises a lithium metal oxide. In the same adapter structure, two second parts and two third parts are arranged respectively, the second parts and the third parts are arranged correspondingly, the two third parts are arranged in a spaced manner in the second direction, and the two third parts are connected with the first part through the corresponding second parts respectively, the connected third part and the second part form a combined part, and the first avoiding structure is formed between the two combined parts.

6. The battery cell of claim 2, wherein, The first protrusion is provided with a second avoiding structure on at least one side facing the tab, so that the combined structure avoids the tab.

7. The battery cell according to any one of claims 2-6, characterized in that, ​ 8. The battery cell of claim 7, wherein the cathode comprises a lithium metal oxide. The second avoiding structure comprises an inclined surface formed on the surface of the first protrusion, which is inclined from an end of the first wall away from the substrate to an end of the first wall connected to the substrate towards a side where the tab is located along the length direction of the first wall.

9. The battery cell of any one of claims 2-8, wherein, The first protrusion has an isosceles trapezoidal cross section.

10. The battery cell of any one of claims 2-9, wherein, The electrode assembly is provided with two electrode assemblies, and the two electrode assemblies are arranged at intervals along the second direction; in the same adapter structure, the first part is connected to the third part on two side walls arranged opposite to each other in the second direction.

11. The battery cell of any one of claims 2-10, wherein, The first wall comprises: an end cover arranged at an interval from the electrode assembly; and an insulating member located on a side of the end cover facing the electrode assembly, and the insulating member is connected to the end cover through the electrode terminal, one side of the insulating member facing the substrate is provided with a boss, the boss is located on one side of the tab, at least part of the boss is arranged in a stack with the substrate, and the shape of the side of the boss facing the tab is adapted to the shape of the side of the substrate facing the tab.

12. The battery cell of claim 11, wherein, The side of the boss facing the substrate is provided with a mounting groove, the shape of the mounting groove is adapted to the shape of the substrate, and the mounting groove is used to accommodate the substrate.

13. The battery cell as described in claim 12, characterized in that, The substrate comprises a first half and a second half connected to each other, the second half is located on a side of the first half close to the tab, and the cross section of the second half is a semicircular structure with a curved surface protruding towards the tab.

14. The battery cell of claim 13, wherein, The bottom of the mounting groove is provided with a reinforcing structure in contact with the second half, and the reinforcing structure is used to strengthen the strength of the contact part of the mounting groove and the second half.

15. The battery cell as described in claim 14, characterized in that, The reinforcing structure comprises a plurality of arc-shaped protrusions arranged at intervals along the extension direction of the semicircular structure.

16. A battery device characterized by comprising: The battery device comprises a plurality of battery cells according to any one of claims 1-15.

17. An electrical device, comprising: The battery device comprises a battery cell according to any one of claims 1-15 or claim 16.

Images