Battery cell, battery device, and electric device

Abstract

This application provides a battery cell, a battery device, and an electrical device. The battery cell includes a casing, an electrode assembly, and electrode terminals. The casing includes a casing wall and a receiving cavity. The electrode assembly is disposed within the receiving cavity and includes an electrode body and a tab connected to the electrode body. The electrode terminals are disposed on the casing wall and connected to the tabs. Each electrode terminal includes a main body and a heat dissipation portion. The heat dissipation portion is at least located on one side of the main body along a first direction and includes a concave-convex structure. The electrode terminals can supply current to the electrode assembly or supply current from the electrode assembly to the outside. The electrode terminals include a main body and a heat dissipation portion. The main body can dissipate heat, and the heat dissipation portion can enhance the heat dissipation effect. The heat dissipation portion includes a concave-convex structure, which can improve heat conduction efficiency, reduce the temperature of the electrode terminals, thereby improving the heat dissipation capacity of the electrode terminals and enhancing the stability and service life of the battery cell.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries are being used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] When using batteries, overcurrent can cause heat dissipation problems, affecting the normal operation of the battery. Therefore, improving the heat dissipation capacity of batteries has gradually become a focus of attention. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, wherein the battery cell is beneficial to improving the heat dissipation capacity of the electrode terminals.

[0005] In a first aspect, this application provides a battery cell, the battery cell including a housing, an electrode assembly, and electrode terminals; the housing includes a housing wall and a receiving cavity; the electrode assembly is disposed in the receiving cavity, the electrode assembly includes an electrode body and a tab, the tab being connected to the electrode body; the electrode terminals are disposed on the housing wall and connected to the tab, the electrode terminals include a main body portion and a heat dissipation portion, the heat dissipation portion is at least disposed on one side of the main body portion along a first direction, the heat dissipation portion includes a concave-convex structure.

[0006] In the technical solution of this application embodiment, the electrode terminal is disposed on the shell wall and connected to the electrode tab, which can conduct current, supply current to the electrode assembly or supply current from the electrode assembly to the outside. The electrode terminal includes a main body and a heat dissipation part, with the heat dissipation part disposed at least on one side of the main body along a first direction. The main body can dissipate heat, and the heat dissipation part can enhance the heat dissipation effect. The heat dissipation part includes a concave-convex structure, which increases the surface area, thereby improving the heat conduction efficiency, transferring heat to the heat dissipation medium more quickly, reducing the temperature of the electrode terminal, thereby improving the heat dissipation capacity of the electrode terminal, and improving the stability and service life of the battery cell.

[0007] In some embodiments, the heat dissipation part is disposed on the side of the main body facing away from the outer casing, which can improve the heat dissipation capacity of the heat dissipation part; at the same time, the heat dissipation part is disposed on this side of the main body, which can fit in close contact with the busbar component, thereby enhancing the heat dissipation effect in the heat generation area.

[0008] In some embodiments, the uneven structure comprises a plurality of grooves on the surface of the heat dissipation portion, the grooves extending along a second direction, and the plurality of grooves being spaced apart along a third direction; the first direction, the second direction, and the third direction are arranged perpendicularly to each other. Using multiple grooves to increase the heat dissipation area can improve the heat dissipation capacity of the electrode terminals, facilitate the production of the electrode terminals, and reduce raw material costs.

[0009] In some embodiments, the groove has a closed end at one end and an open end at the other in the second direction. The closed end is located inside the heat dissipation section, and the open end communicates with the wall surface of the heat dissipation section. The groove can introduce a heat dissipation medium into it through the open end, facilitating heat dissipation. Each groove does not penetrate the heat dissipation section, which can improve the structural strength of the heat dissipation section and avoid riveting areas.

[0010] In some embodiments, the closed end is arc-shaped and smoothly transitions with the groove on the two walls in the third direction. The arc-shaped closed end can reduce stress concentration and improve the structural strength of the heat dissipation part.

[0011] In some embodiments, the spacing between adjacent grooves on the third-order upward direction is less than the width of the groove. By reducing the spacing between adjacent grooves, the number of grooves can be increased, thereby improving the heat dissipation performance of the heat sink.

[0012] In some embodiments, the grooves are provided with equal width in the third direction and equal depth in the first direction, which facilitates groove forming and can improve the consistency of heat dissipation in the extension direction and the consistency of structural strength of the heat dissipation part in the second direction.

[0013] In some embodiments, the width of the groove in the third direction ranges from 0.5 mm to 4 mm, which can balance the smoothness of molding and the efficiency of heat dissipation; the depth of the groove in the first direction ranges from 0.1 mm to 0.7 mm, which can balance the structural strength and the efficiency of heat dissipation.

[0014] In some embodiments, the width of the groove in the third direction ranges from 1 mm to 3 mm, and the depth of the groove in the first direction ranges from 0.3 mm to 0.6 mm, which can further optimize the heat dissipation performance and structural strength of the electrode terminal.

[0015] In some embodiments, the heat dissipation portion is embedded in the main body portion; the heat dissipation portion is made of copper, and the main body portion is made of aluminum. The formed electrode terminal serves as the negative electrode of the battery cell, which can enhance heat dissipation at the negative electrode of the battery cell and save on the manufacturing cost of the battery cell. The groove design not only enhances heat dissipation but also provides positioning for the copper strip during the composite molding of the electrode terminal, reducing the risk of poor welding, cover plate defects, and battery cell scrap.

[0016] In some embodiments, in the first direction, the embedding depth of the heat dissipation part on the main body is equal to the thickness of the heat dissipation part, which can improve the connection strength between the heat dissipation part and the main body and facilitate the connection between the heat dissipation part and the busbar component.

[0017] In some embodiments, in the second direction, the length of the heat dissipation portion is equal to the length of the main body portion, which not only enhances heat dissipation but also facilitates continuous production of electrode terminals; in the third direction, the heat dissipation portion is located in the middle of the main body portion, and the length of the heat dissipation portion is less than the length of the main body portion, which can enhance heat dissipation while saving costs.

[0018] In some embodiments, the depth of the groove in the first direction is one-third to two-thirds of the thickness of the heat dissipation part, which can balance heat dissipation performance and structural strength of the heat dissipation part, and improve the reliability of the electrode terminals.

[0019] Secondly, this application provides a battery device that includes the battery cell described in the above embodiments.

[0020] Thirdly, this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0021] 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

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. 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:

[0023] Figure 1 This is a simplified schematic diagram of a vehicle according to some embodiments of this application;

[0024] Figure 2 This is a split schematic diagram of a battery device according to some embodiments of this application;

[0025] Figure 3 This is a schematic diagram of the structure of a battery cell according to some embodiments of this application;

[0026] Figure 4 This is a schematic diagram of the installation of electrode terminals from one viewpoint for some embodiments of this application;

[0027] Figure 5 This is a schematic diagram of the electrode terminals of some embodiments of this application from another perspective;

[0028] Figure 6 This is a schematic diagram of the electrode terminals of some embodiments of this application from another perspective;

[0029] Figure 7 This is a schematic diagram of the electrode terminals of some embodiments of this application from one view.

[0030] Figure 8 This is a schematic diagram of the electrode terminals of some embodiments of this application from another perspective;

[0031] Figure 9 This is a schematic diagram of the electrode terminals of some embodiments of this application from another perspective.

[0032] The reference numerals in the detailed embodiments are as follows:

[0033] 1000 - Vehicle; 100 - Battery unit; 200 - Controller; 300 - Motor;

[0034] 10-Battery module; 11-Box; 111-First box; 112-Second box; 1-Battery cell;

[0035] 2-Electrode terminal; 21-Negative electrode terminal; 211-Main body; 212-Heat dissipation part; 2121-Groove; 2122-Riveting area; 22-Positive electrode terminal; 3-Outer shell; 31-Cover plate; 32-Housing shell;

[0036] X - Third direction; Y - Second direction; Z - First direction. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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).

[0043] 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.

[0044] 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.

[0045] 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.

[0046] In the field of power batteries, when the current exceeds the design specifications or withstand capacity during charging and discharging, energy is released in the form of heat. This heat is dissipated through components such as the electrode terminals, causing the electrode terminals to heat up. The limit cover generates heat during overcurrent, which is particularly noticeable in batteries with high overcurrent. However, due to size limitations, the heat dissipation effect of the electrode terminals is not ideal.

[0047] In extreme casement batteries, due to size limitations, the electrode terminals cannot be enlarged to improve heat dissipation. Overheating of the electrode terminals accelerates battery aging, reduces performance and lifespan, and can damage or degrade connected electronic devices. Sustained overheating of the electrode terminals may lead to thermal runaway or even safety incidents such as explosions or fires.

[0048] To improve heat dissipation at electrode terminals, given the limited size of the terminals, their surface structure can be designed to increase the heat dissipation area. Increasing the heat dissipation area improves heat conduction efficiency, allowing heat to be transferred to the heat dissipation medium, thereby reducing the temperature of the electrode terminals.

[0049] Based on the above considerations, this application designs a battery cell that increases the heat dissipation area by providing a heat dissipation portion with a concave-convex structure on the electrode terminals of the battery cell. In such a battery cell, the heat dissipation performance of the electrode terminals is improved due to the increased heat dissipation area, thereby improving the heat dissipation effect.

[0050] 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 battery devices disclosed in this application, which helps improve heat dissipation, stability, and service life.

[0051] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0052] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0053] Please refer to Figure 1 , Figure 1 This is a simplified schematic diagram of a vehicle according to some embodiments of this application.

[0054] Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0055] 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.

[0056] Please refer to Figure 2 , Figure 2 This is a split schematic diagram of a battery device according to some embodiments of this application.

[0057] The battery device 100 includes a housing 11 and a battery cell 1, with the battery cell 1 housed within the housing 11. The housing 11 provides a space for the battery cell 1 and can have various structures. In some embodiments, the housing 11 may include a first housing 111 and a second housing 112, which overlap each other, collectively defining a space for accommodating the battery cell 1. The second housing 112 may be a hollow structure with one open end, while the first housing 111 may be a plate-like structure, covering the open side of the second housing 112 so that the first housing 111 and the second housing 112 together define the space. Alternatively, both the first housing 111 and the second housing 112 may be hollow structures with one open end, with the open side of the first housing 111 covering the open side of the second housing 112. Of course, the box 11 formed by the first box 111 and the second box 112 can be of various shapes, such as a cylinder, a cuboid, etc.

[0058] In the battery device 100, there can be multiple battery cells, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells are connected in both series and parallel connections. Multiple battery cells can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells is housed within a casing. Alternatively, the battery device 100 can also consist of multiple battery cells first connected in series, parallel, or in a mixed configuration to form a battery module 10, and then multiple battery modules 10 connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within a casing. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells.

[0059] Each battery cell 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.

[0060] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell according to some embodiments of this application.

[0061] A battery cell 1 refers to the smallest unit that makes up the battery device 100. A battery cell 1 includes a cover plate 31, a housing 32, electrode terminals 2, electrode assemblies, and other functional components.

[0062] The cover plate 31 is a component that covers the opening of the housing 32 to isolate the internal environment of the battery cell 1 from the external environment. Optionally, the cover plate 31 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the cover plate 31 is not easily deformed when subjected to compression and impact, giving the battery cell 1 higher structural strength and improving safety performance. The electrode terminals 2 are mounted on the cover plate 31. The electrode terminals 2 can be used to electrically connect with the electrode assembly for outputting or inputting electrical energy into the battery cell 1.

[0063] The housing 32 is a component used to cooperate with the cover plate 31 to form the internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate electrode components, electrolyte, and other components. The housing 32 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.

[0064] The electrode assembly is the component in the battery cell 1 where the electrochemical reaction occurs. The electrode assembly 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 electrode body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material constitute the positive and negative electrode tabs, respectively. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the positive and negative electrode tabs connect to the electrode terminals 2 to form a current loop.

[0065] Please refer to Figures 4 to 6 , Figure 4 This is a schematic diagram of the installation of electrode terminals from one viewpoint for some embodiments of this application; Figure 5 This is a schematic diagram of the electrode terminals of some embodiments of this application from another perspective; Figure 6 This is a schematic diagram of the electrode terminals of some embodiments of this application from another perspective.

[0066] According to some embodiments of this application, this application provides a battery cell 1, which includes a housing 3, an electrode assembly, and electrode terminals 2. The housing 3 includes a housing wall and a receiving cavity; the electrode assembly is disposed in the receiving cavity and includes an electrode body and a tab, the tab being connected to the electrode body. The electrode terminals 2 are disposed on the housing wall and connected to the tabs. The electrode terminals 2 include a main body portion 211 and a heat dissipation portion 212. The heat dissipation portion 212 is at least disposed on one side of the main body portion 211 along a first direction Z, and the heat dissipation portion 212 includes a concave-convex structure.

[0067] In a single battery cell 1, the number of electrode terminals 2 can be one or two. When there are two electrode terminals 2, one electrode terminal 2 may have a heat dissipation part 212 while the other electrode terminal 2 may not have a heat dissipation part 212, or both electrode terminals 2 may have a heat dissipation part 212. The electrode terminals 2 are disposed on the shell wall. The electrode terminals 2 and the shell wall can be separate structures, with the electrode terminals 2 mounted on the shell wall, and the mounting can be done by welding, riveting, etc.; the electrode terminals 2 and the shell wall can also be an integral structure, with the electrode terminals 2 formed on the shell wall. The shell wall can be the wall of the cover plate 31 of the outer shell 3, or the wall of the shell 32 of the outer shell 3.

[0068] In electrode terminal 2, heat dissipation part 212 is provided on the main body part 211 and located on the side of the main body part 211. The heat dissipation part 212 and the main body part 211 can be an integral structure, with the heat dissipation part 212 being a part of the main body part 211 used to enhance heat dissipation; or the heat dissipation part 212 and the main body part 211 can be a separate structure, that is, the heat dissipation part 212 and the main body part 211 are two parts that can be connected together by welding, riveting, or other means.

[0069] Along the first direction Z, the heat dissipation part 212 is provided on at least one side of the main body part 211. Here, the first direction Z can be the direction in which the main body part 211 is away from the outer casing 3, or it can be any direction intersecting with this direction. The heat dissipation part 212 can be provided on one surface of the main body, or it can be provided on multiple surfaces of the main body part 211.

[0070] For example, such as Figure 5 and Figure 6 As shown, electrode terminals 2 are disposed on the shell wall and are protruding boss structures protruding from the shell wall surface. In electrode terminals 2, the surface area facing away from the outer shell 3 is large and can be called the large surface of electrode terminal 2, and the rest that is in contact with the large surface is called the side surface of electrode terminal 2. The heat dissipation part 212 can be disposed only on the large surface, only on the side surface, or simultaneously on both the large surface and the side surface. The first direction Z can be a direction perpendicular to the large surface or a direction perpendicular to the side surface.

[0071] The concave-convex structure is formed on the surface of the heat dissipation part 212. The concave-convex structure can be a protrusion on the surface of the heat dissipation part 212, which can be one or multiple protrusions; the concave-convex structure can also be a groove on the surface of the heat dissipation part 212, which can be one or multiple grooves; the concave-convex structure can also be both a protrusion and a groove on the surface of the heat dissipation part 212 at the same time, where both the protrusion and the groove can be one or multiple, or where there is one protrusion and multiple grooves, or one groove and multiple protrusions.

[0072] When the concave-convex structure is a protrusion and / or groove on the surface of the heat dissipation part 212, the protrusion is outwardly convex in the heat dissipation part 212, and can be a smooth protrusion or a protrusion with edges; the groove 2121 is inwardly concave in the heat dissipation part 212, and can be a smooth concave ...

[0073] In the technical solution of this application embodiment, the electrode terminal 2 of the battery cell 1 is disposed on the shell wall of the outer casing 3 and connected to the electrode tab, which can conduct current, supply current to the electrode assembly or supply current from the electrode assembly to the outside. The electrode terminal 2 includes a main body 211 and a heat dissipation part 212. The heat dissipation part 212 is at least disposed on one side of the main body 211 along the first direction Z. The main body 211 can dissipate heat, and the heat dissipation part 212 can enhance the heat dissipation effect (the heat dissipation effect of the heat dissipation part 212 is greater than that of the main body 211). The heat dissipation part 212 includes a concave-convex structure. By increasing the surface area through the concave-convex structure, the heat conduction efficiency can be improved, and heat can be transferred to the heat dissipation medium more quickly, reducing the temperature of the electrode terminal 2, thereby improving the heat dissipation capacity of the electrode terminal 2 and improving the stability and service life of the battery cell 1.

[0074] like Figure 3 and Figure 4As shown, according to some embodiments of this application, optionally, the heat dissipation part 212 is disposed on the side of the main body 211 facing away from the outer casing 3.

[0075] The first direction Z is the direction in which the main body 211 is away from the outer casing 3, and the heat dissipation part 212 is provided on the large surface of the main body 211. That is, the heat dissipation part 212 is located on the surface where the electrode terminal 2 is in contact with the busbar component, and can be attached to the busbar component.

[0076] In the technical solution of this application embodiment, the heat dissipation part 212 is disposed on the side of the main body part 211 facing away from the outer shell 3. The heat dissipation area of ​​the main body part 211 on this side is large, and the heat dissipation part 212 disposed on this side can further improve the heat dissipation capacity of the heat dissipation part 212. At the same time, the heat dissipation part 212 disposed on this side of the main body part 211 can fit in close contact with the busbar component, thereby enhancing the heat dissipation effect in the heat generation area.

[0077] Please refer to Figure 7 , Figure 7 This is a schematic diagram of the electrode terminals of some embodiments of this application from one viewpoint.

[0078] According to some embodiments of this application, optionally, the concave-convex structure is a plurality of grooves 2121 on the surface of the heat dissipation part 212, the grooves 2121 extend along the second direction Y, and the plurality of grooves 2121 are spaced apart along the third direction X; the first direction Z, the second direction Y, and the third direction X are arranged perpendicularly to each other.

[0079] like Figure 7 As shown, the height direction of battery cell 1 is the first direction Z, the thickness direction of battery cell 1 is the second direction Y, and the length direction of battery cell 1 is the third direction X. The following descriptions will all follow this pattern.

[0080] The surface of the heat dissipation part 212 includes a plurality of grooves 2121, which are recessed into the surface of the heat dissipation part 212 to form a concave-convex structure. When the grooves 2121 are recessed into the surface of the heat dissipation part 212, along the second direction Y, the depth of the recesses 2121 can remain constant or vary in depth, and the grooves 2121 can penetrate the heat dissipation part 212 or not. Along the third direction X, the width of the grooves 2121 can remain constant or vary in width.

[0081] There are multiple grooves 2121 on the surface of the heat dissipation part 212. Multiple grooves 2121 are arranged side by side along the third direction X, and multiple grooves 2121 can also be arranged side by side along the second direction Y. In the third direction X, the multiple grooves 2121 are spaced apart, and the spacing between adjacent grooves 2121 can be the same or different.

[0082] In the technical solution of this application embodiment, the concave-convex structure is a plurality of grooves 2121 on the surface of the heat dissipation part 212. By setting a plurality of grooves 2121, the heat dissipation area is increased, which can improve the heat dissipation capacity of the electrode terminal 2. The grooves 2121 are formed by subtractive processing (for example, by extrusion), which also facilitates the production of the electrode terminal 2 and reduces the amount of raw materials used.

[0083] Please refer to Figure 8 , Figure 8 This is a schematic diagram of the electrode terminals of some embodiments of this application from another perspective.

[0084] According to some embodiments of this application, optionally, the groove 2121 has a closed end at one end and an open end at the other end in the second direction Y. The closed end is located inside the heat dissipation part 212, and the open end communicates with the wall surface of the heat dissipation part 212.

[0085] Along the second direction Y, each groove 2121 does not penetrate the heat dissipation part 212, but is only connected to the wall of the heat dissipation part 212 through its open end.

[0086] For example, with the third direction X as the row and the second direction Y as the column, a plurality of grooves 2121 are arranged in two rows and three columns, and the closed ends of the two rows of grooves 2121 are arranged opposite each other. The area between the two rows of grooves 2121 is the riveting area 2122 of the heat dissipation part 212.

[0087] In the technical solution of this application embodiment, the closed end of the groove 2121 is located inside the heat dissipation part 212, and the open end communicates with the wall surface of the heat dissipation part 212. The groove 2121 can introduce heat dissipation medium (e.g., air) into the groove 2121 through the open end, which facilitates heat dissipation of the electrode terminal 2. Each groove 2121 does not penetrate the heat dissipation part 212, which can reduce the deformation of the heat dissipation part 212 when processing the groove 2121 and improve the structural strength of the heat dissipation part 212. At the same time, it can also make the groove 2121 avoid the riveting area 2122 on the heat dissipation part 212, and maintain the connection strength of the electrode terminal 2.

[0088] like Figure 8 As shown, according to some embodiments of this application, optionally, the closed end is arc-shaped and smoothly transitions with the groove 2121 on the two walls in the third direction X.

[0089] The closed end is arc-shaped, which can be either a circular arc or an elliptical arc. The wall surface of the closed end and the two walls of the groove 2121 that meet the closed end in the third direction X are tangent to each other, and no edge line is generated at the intersection. The wall surface of the closed end and the two walls of the groove 2121 in the third direction X can both be parallel to the first direction Z, or they can both intersect with the first direction Z (i.e., the groove 2121 can be provided with a draft angle).

[0090] For example, the contour of the closed end is arc-shaped with a central angle of 180°, and the two walls of the groove 2121 in the third direction X are tangent to the wall of the closed end. The wall of the closed end and the two walls of the groove 2121 in the third direction X are both parallel to the first direction Z.

[0091] In the technical solution of this application embodiment, the closed end is arc-shaped and without sharp corners, which can reduce stress concentration, optimize the stress distribution of the heat dissipation part 212, and improve the structural strength of the heat dissipation part 212. The closed end and the groove 2121 smoothly transition on both sides of the third direction X, which facilitates the smoothness of the processing of the groove 2121 (for example, pressing the groove 2121 into the heat dissipation part 212 by extrusion).

[0092] like Figure 8 As shown, according to some embodiments of this application, optionally, the spacing (G) between adjacent grooves 2121 on the third direction X is smaller than the width (W) of the groove 2121.

[0093] On the third direction X, the width of the groove 2121 is large, and the spacing between adjacent grooves 2121 is small. For example, the spacing between adjacent grooves 2121 can be three-fifths to four-fifths of the width of the groove 2121. The spacing between adjacent grooves 2121 can be three-fifths, seven-tenths, four-fifths of the width of the groove 2121, or thirteen-twentieths, three-quarters, etc.

[0094] In the technical solution of this application embodiment, the interval between adjacent grooves 2121 on the third direction X is less than the width of the groove 2121. By reducing the interval between adjacent grooves 2121, the number of grooves 2121 can be increased, thereby improving the heat dissipation performance of the heat dissipation part 212.

[0095] Please refer to Figure 9 , Figure 9 This is a schematic diagram of the electrode terminals of some embodiments of this application from another perspective.

[0096] According to some embodiments of this application, optionally, the groove 2121 is provided with a uniform width in the third direction X, and the groove 2121 is provided with a uniform depth in the first direction Z.

[0097] Along the second direction Y (the extension direction of groove 2121), the recess depth of groove 2121 is a fixed value. The width of groove 2121 is a fixed value (except for the closed end).

[0098] In the technical solution of this application embodiment, the groove 2121 is provided with equal width in the third direction X and equal depth in the first direction Z, which facilitates the forming of the groove 2121, can improve the consistency of heat dissipation of the groove 2121 in the extension direction, and improve the consistency of the structural strength of the heat dissipation part 212 in the second direction Y.

[0099] like Figure 8 and Figure 9 As shown, according to some embodiments of this application, optionally, the width (W) of the groove 2121 in the third direction X ranges from 0.5 mm to 4 mm, and the depth (D) of the groove 2121 in the first direction Z ranges from 0.1 mm to 0.7 mm.

[0100] On the third direction X, the width (W) of the groove 2121 can be any value among 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, and 4mm, or any intermediate value between any two adjacent values ​​mentioned above.

[0101] On the third direction X, the width of the groove 2121 can also be set gradually, for example, from the closed end to the open end, the width of the groove 2121 can gradually change from 0.5mm to 4mm.

[0102] In the first direction Z, the depth (D) of the groove 2121 can be any value among 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, and 0.7mm, or any intermediate value between any two adjacent values ​​mentioned above.

[0103] In the first direction Z, the depth of the groove 2121 can also be set gradually, for example, from the closed end to the open end, the depth of the groove 2121 can gradually change from 0.1mm to 0.7mm.

[0104] If the groove 2121 is less than 0.5mm in the third direction X, the width is too narrow and difficult to form; if it is greater than 4mm, the number of grooves 2121 will be reduced, thereby reducing the heat dissipation area.

[0105] If the groove 2121 is less than 0.1 mm in the first direction Z, it is too shallow and does not help to increase the heat dissipation area; if it is greater than 0.7 mm, it is too deep and affects the structural strength of the heat dissipation part 212.

[0106] In the technical solution of this application embodiment, the width of the groove 2121 in the third direction X ranges from 0.5mm to 4mm, which can take into account both the smoothness of molding and the high efficiency of heat dissipation; the depth of the groove 2121 in the first direction Z ranges from 0.1mm to 0.7mm, which can take into account both structural strength and high efficiency of heat dissipation.

[0107] like Figure 8 and Figure 9 As shown, according to some embodiments of this application, optionally, the width (W) of the groove 2121 in the third direction X ranges from 1 mm to 3 mm, and the depth (D) of the groove 2121 in the first direction Z ranges from 0.3 mm to 0.6 mm.

[0108] On the third direction X, the width (W) of the groove 2121 can be any value among 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, and 3mm, or any intermediate value between any two adjacent values ​​mentioned above.

[0109] In the first direction Z, the depth (D) of the groove 2121 can be any value among 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, 0.42mm, 0.44mm, 0.46mm, 0.48mm, 0.5mm, 0.52mm, 0.54mm, 0.56mm, 0.58mm, and 0.6mm, or any intermediate value between any two adjacent values ​​mentioned above.

[0110] For example, along the third direction X, the grooves 2121 are provided with a uniform width of 2mm, and adjacent grooves 2121 are provided with a uniform interval of 1.4mm. Along the first direction Z, the grooves 2121 are provided with a uniform depth of 0.4mm.

[0111] In the technical solution of this application embodiment, the width of the groove 2121 in the third direction X ranges from 1mm to 3mm, and the depth of the groove 2121 in the first direction Z ranges from 0.3mm to 0.6mm, which can further optimize the heat dissipation performance and structural strength of the electrode terminal 2.

[0112] like Figure 7 As shown, according to some embodiments of this application, optionally, the heat dissipation part 212 is embedded in the main body part 211; the heat dissipation part 212 is made of copper and the main body part 211 is made of aluminum.

[0113] Each battery cell 1 has two electrode terminals 2, one of which has a heat dissipation part 212 and the other does not have a heat dissipation part 212. The electrode terminal 2 with the heat dissipation part 212 serves as the negative electrode of the battery cell 1, and the electrode terminal 2 without the heat dissipation part 212 serves as the positive electrode of the battery cell 1 (the absence of a heat dissipation part 212 does not mean that the electrode terminal 2 serving as the positive electrode cannot dissipate heat, but rather that no enhanced heat dissipation design is made for the electrode terminal 2 serving as the positive electrode).

[0114] The heat dissipation part 212 is made of copper, such as pure copper or a copper alloy; the main body 211 is made of aluminum, such as pure aluminum or an aluminum alloy. When the heat dissipation part 212 and the main body 211 are connected, they are manufactured using a composite process of copper strip and molten aluminum. Specifically, the copper strip enters the roll and contacts the roll, and then contacts the molten aluminum at the die opening. After the molten aluminum solidifies, the copper strip and molten aluminum are interlocked. The roll has protrusions that can press grooves 2121 into the copper strip when the roll contacts the copper strip.

[0115] In the technical solution of this application embodiment, the heat dissipation part 212 is made of copper, and the main body part 211 is made of aluminum. The heat dissipation part 212 is embedded in the main body part 211, and the formed electrode terminal 2 is used as the negative electrode of the battery cell 1. This can enhance the heat dissipation of the battery cell 1 at the negative electrode (during the charging and discharging process of the battery cell 1, the insertion and extraction of lithium ions at the negative electrode are accompanied by the release and absorption of heat, so the heat generated at the negative electrode is often greater than that at the positive electrode), and save the manufacturing cost of the battery cell 1. In addition, the design of the groove 2121 of the heat dissipation part 212 can not only enhance heat dissipation, but also provide positioning for the copper strip during the composite molding of the electrode terminal 2, thereby reducing the risk of poor welding of the busbar component, scrapping of the cover plate 31, and battery cell 1 caused by copper strip misalignment.

[0116] like Figure 9 As shown, according to some embodiments of this application, optionally, in the first direction Z, the embedding depth of the heat dissipation part 212 on the main body part 211 is equal to the thickness of the heat dissipation part 212.

[0117] On the main body 211, the heat dissipation part 212 neither protrudes outward from the surface of the main body 211 nor is it recessed inward from the surface of the main body 211. Along the third direction X, the heat dissipation part 212 and the main body 211 smoothly transition at the junction.

[0118] For example, the surface of the main body 211 facing away from the outer shell 3 is a plane, and the surface of the heat dissipation part 212 facing away from the outer shell 3, except for the groove 2121 and the riveting area 2122, is also a plane, and the two planes are flush.

[0119] In the technical solution of this application embodiment, the embedding depth of the heat dissipation part 212 on the main body part 211 in the first direction Z is the same as the thickness of the heat dissipation part 212. The heat dissipation part 212 is embedded in the main body part 211 throughout the entire thickness range, which can improve the connection strength between the heat dissipation part 212 and the main body part 211. In addition, the heat dissipation part 212 and the main body part 211 have a smooth transition at the junction, which facilitates the connection between the heat dissipation part 212 and the busbar component.

[0120] like Figure 8As shown, according to some embodiments of this application, optionally, in the second direction Y, the length of the heat dissipation part 212 is equal to the length of the main body part 211; in the third direction X, the heat dissipation part 212 is located in the middle of the main body part 211, and the length of the heat dissipation part 212 is less than the length of the main body part 211.

[0121] The outer contour of the heat dissipation part 212 is rectangular, with its length along the second direction Y and its width along the third direction X; the outer contour of the main body part 211 is rectangular, with its length along the third direction X and its width along the second direction Y. The length of the heat dissipation part 212 is equal to the width of the main body part 211, and the width of the heat dissipation part 212 is less than the length of the main body part 211.

[0122] The electrode terminal 2 is formed using a composite process of copper strip and molten aluminum, which can create multiple interconnected electrode terminal 2 blanks. These multiple electrode terminals 2 are connected in the second direction Y. After the blanks are formed, the electrode terminals 2 can be manufactured using processes such as cutting and stamping.

[0123] In the technical solution of this application embodiment, the heat dissipation part 212 is located in the middle of the main body part 211 in the third direction X, and the width of the heat dissipation part 212 is less than the length of the main body part 211. The heat dissipation part 212 is arranged only at the junction of the electrode terminal 2 and the busbar component, which can save costs while enhancing heat dissipation. The length of the heat dissipation part 212 is equal to the width of the main body part 211. In the second direction Y, the heat dissipation part 212 can communicate with the heat dissipation medium (e.g., air), which not only enhances heat dissipation but also facilitates the continuous production and manufacturing of the electrode terminal 2.

[0124] like Figure 9 As shown, according to some embodiments of this application, optionally, the depth (D) of the groove 2121 in the first direction Z is one-third to two-thirds of the thickness (T) of the heat dissipation portion 212.

[0125] In the first direction Z, the depth of the groove 2121 is less than the thickness of the heat dissipation part 212. The depth of the groove 2121 can be one-third, four-ninths, one-half, five-ninths, two-thirds, etc. of the thickness of the heat dissipation part 212.

[0126] For example, the depth of the groove 2121 can be 0.4 mm, the thickness of the heat dissipation part 212 can be 0.8 mm, and the depth of the groove 2121 is half the thickness of the heat dissipation part 212.

[0127] When producing electrode terminal 2, the groove 2121 is formed by pressing with a pressure roller. If the pressing amount is too large, it will easily affect the structural strength of the heat dissipation part 212. If the pressing amount is too small, it will not help increase the heat dissipation area.

[0128] In the technical solution of this application embodiment, the depth of the groove 2121 is one-third to two-thirds of the thickness of the heat dissipation part 212, which can take into account both heat dissipation performance and structural strength of the heat dissipation part 212, and improve the reliability of the electrode terminal 2.

[0129] According to some embodiments of this application, this application also provides a battery device 100, including a battery cell 1 of any of the above schemes.

[0130] According to some embodiments of this application, this application also provides an electrical device, including a battery device 100 of any of the above schemes, the battery device 100 being used to provide electrical energy to the electrical device.

[0131] The power supply device can be any of the aforementioned devices or systems that utilize battery device 100.

[0132] like Figures 3 to 9 As shown, according to some embodiments of this application, this application provides a battery cell 1, which is a prismatic battery cell. The battery cell 1 includes a housing 3, an electrode assembly, and electrode terminals 2. There are two electrode terminals 2, one is a positive electrode terminal 22, and the other is a negative electrode terminal 21. The positive electrode terminal 22 and the negative electrode terminal 21 are both located on the cover plate 31 of the housing 3 and are insulated from the cover plate 31 to form a top cover. The negative electrode terminal 21 includes a main body 211 and a heat dissipation part 212. The heat dissipation part 212 is embedded in the side of the main body 211 facing away from the housing 3. The surface of the heat dissipation part 212 has six grooves 2121, arranged in two rows and three columns in a third direction X and a second direction Y. The six grooves 2121 are symmetrically distributed in the second direction Y and the third direction X. The depth of each groove 2121 ranges from 0.3 mm to 0.6 mm, and the width ranges from 1 mm to 3 mm. The heat dissipation section 212 communicates with two walls of the main body section 211 perpendicular to the second direction Y. The groove 2121 communicates with the wall of the heat dissipation section 212 perpendicular to the second direction Y in the second direction Y. This increases the surface area of ​​the negative electrode terminal 21, enhances heat dissipation, and thus improves the stability and service life of the battery cell 1. Furthermore, the design of the groove 2121 can reduce material costs and decrease the scrap rate of the top cover and battery cell 1 during production.

[0133] 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, include: The outer shell includes the shell walls and the receiving cavity; An electrode assembly is disposed within the receiving cavity. The electrode assembly includes an electrode body and a tab, and the tab is connected to the electrode body. An electrode terminal is disposed on the shell wall and connected to the electrode tab. The electrode terminal includes a main body and a heat dissipation part. The heat dissipation part is disposed at least on one side of the main body along a first direction and includes a concave-convex structure.

2. The battery cell of claim 1, wherein, The heat dissipation section is located on the side of the main body facing away from the outer casing.

3. The battery cell according to claim 1 or 2, characterized in that, The concave-convex structure is a plurality of grooves on the surface of the heat dissipation part, the grooves extending along the second direction, and the plurality of grooves being spaced apart along the third direction; The first direction, the second direction, and the third direction are set perpendicularly to each other.

4. The battery cell according to claim 3, characterized in that, The groove has a closed end at one end and an open end at the other end in the second direction. The closed end is located inside the heat dissipation part, and the open end communicates with the wall surface of the heat dissipation part.

5. The battery cell according to claim 4, characterized in that, The closed end is arc-shaped and smoothly transitions with the groove on the two walls in the third direction.

6. The battery cell according to any one of claims 3 to 5, characterized in that, The spacing between adjacent grooves on the third side is less than the width of the groove.

7. The battery cell according to any one of claims 3 to 6, characterized in that, The groove is provided with a uniform width in the third direction and a uniform depth in the first direction.

8. The battery cell according to any one of claims 3 to 7, characterized in that, The width of the groove in the third direction ranges from 0.5 mm to 4 mm, and the depth of the groove in the first direction ranges from 0.1 mm to 0.7 mm.

9. The battery cell according to claim 8, characterized in that, The width of the groove in the third direction ranges from 1 mm to 3 mm, and the depth of the groove in the first direction ranges from 0.3 mm to 0.6 mm.

10. The battery cell according to any one of claims 3 to 9, characterized in that, The heat dissipation part is embedded in the main body; The heat dissipation part is made of copper, and the main body is made of aluminum.

11. The battery cell according to claim 10, characterized in that, In the first direction, the embedding depth of the heat dissipation part on the main body is equal to the thickness of the heat dissipation part.

12. The battery cell according to claim 10 or 11, characterized in that, In the second direction, the length of the heat dissipation portion is equal to the length of the main body portion; In the third direction, the heat dissipation part is located in the middle of the main body, and the length of the heat dissipation part is less than the length of the main body.

13. The battery cell according to any one of claims 10 to 12, characterized in that, The depth of the groove in the first direction is one-third to two-thirds of the thickness of the heat dissipation part.

14. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 13.

15. An electrical appliance, characterized in that, Includes the battery device as described in claim 14, the battery device being used to provide electrical energy.

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