Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly, an electrode terminal and an adapter part, the shell is provided with a first wall, the electrode assembly is accommodated in the shell and comprises a tab, and the electrode terminal is arranged on the first wall. The switching component comprises a main body part and a heat dissipation part, the main body part is electrically connected to the tabs and the electrode terminals, and the heat dissipation part is connected to the end of the main body part and extends in the direction away from the main body part. According to the invention, the reliability and performance of the battery monomer can be effectively improved.

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, for example 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] In the development of battery technology, improving the reliability and performance of individual battery cells is a continuous research direction. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which can effectively improve the reliability and performance of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, which includes a housing, an electrode assembly, electrode terminals, and an adapter. The housing has a first wall, and the electrode assembly is housed within the housing. The electrode assembly includes tabs, and the electrode terminals are disposed on the first wall. The adapter includes a main body and a heat dissipation part. The main body is electrically connected to the tabs and the electrode terminals, and the heat dissipation part is connected to an end of the main body and extends in a direction away from the main body.

[0006] The above technical solution provides a larger layout space for the heat dissipation part by connecting the heat dissipation part to the end of the main body and extending it in a direction away from the main body. This helps to increase the contact area between the heat dissipation part and the air, thereby improving the overall heat dissipation capacity of the adapter component and effectively improving the reliability and performance of the battery cell.

[0007] In some embodiments of the first aspect, the main body includes a first connecting portion and a second connecting portion connected together, the first connecting portion being electrically connected to a tab and the second connecting portion being electrically connected to an electrode terminal. A heat dissipation portion is connected to the end of the second connecting portion away from the first connecting portion.

[0008] The above technical solution not only improves the heat dissipation capacity of the adapter component, but also maintains full contact between the tab and the adapter component, thereby optimizing the current flow capacity between the tab and the first connection part and improving the performance of the battery cell.

[0009] In some embodiments of the first aspect, the thermal conductivity of the heat dissipation part is greater than that of the main body part, which can further improve the heat dissipation performance of the heat dissipation part.

[0010] In some embodiments of the first aspect, the heat dissipation portion includes a plurality of first ribs, which are spaced apart from each other.

[0011] The above technical solution can further increase the contact area between the heat dissipation part and the air, thereby further improving the overall heat dissipation capacity of the adapter component.

[0012] In some embodiments of the first aspect, the first rib is configured as a wavy structure or a serrated structure.

[0013] The above technical solution can further increase the contact area between the heat dissipation part and the air, thereby further improving the overall heat dissipation capacity of the adapter component.

[0014] In some embodiments of the first aspect, the heat dissipation part further includes a plurality of second ribs, which are spaced apart and intersect with the plurality of first ribs to form a mesh structure.

[0015] The above technical solution forms a grid structure by intersecting multiple second ribs and multiple first ribs, which can not only further increase the heat dissipation area of ​​the heat dissipation part to further improve the overall heat dissipation capacity of the transition component, but also improve the structural strength of the heat dissipation part and improve the reliability of the transition component.

[0016] In some embodiments of the first aspect, the electrode assembly further includes an electrode body, with a tab connected to the end of the electrode body facing the first wall. An adapter is located between the first wall and the electrode assembly, and a heat dissipation portion is connected to the end of the body portion along a first direction, which intersects the thickness direction of the first wall.

[0017] The above-mentioned technical solution has a large arrangement area along the first direction within the space between the first wall and the electrode assembly. The heat dissipation part is connected to the end of the main body along the first direction, which can provide a large arrangement space for the heat dissipation part, help increase the contact area between the heat dissipation part and the air, so as to improve the overall heat dissipation capacity of the adapter component, thereby effectively improving the reliability and performance of the battery cell.

[0018] In some embodiments of the first aspect, the main body includes a first connecting portion and a second connecting portion connected together, the first connecting portion and the second connecting portion being disposed along a first direction, the first connecting portion being electrically connected to a tab, and the second connecting portion being electrically connected to an electrode terminal. A heat dissipation portion is connected to the end of the second connecting portion away from the first connecting portion.

[0019] The first connecting part, the second connecting part, and the heat dissipation part of the above technical solution are arranged along the first direction, and the heat dissipation part is connected to the end of the second connecting part away from the first connecting part. This allows the heat dissipation part to be further moved away from the space near the electrode where the first connecting part is arranged, thereby further reducing the impact of the introduction of the heat dissipation part on the current flow performance between the electrode and the first connecting part.

[0020] In some embodiments of the first aspect, the first wall includes a first portion and a second portion, wherein the second portion is closer to the electrode assembly relative to the first portion along the thickness direction, and electrode terminals are disposed in the second portion. The main body portion also includes a bent portion connected to the first connecting portion and bent along the thickness direction close to the electrode assembly, and a second connecting portion connected to the end of the bent portion away from the first connecting portion.

[0021] By placing the electrode terminals in the second part, the electrode terminals can fully utilize the space formed by the height difference in the thickness direction between the first and second parts, which helps to reduce the size of the battery cell and increase its energy density. The introduction of the bending portion allows the main body to form a Z-shaped structure, which can better adapt to the structure of the first wall in this embodiment, improve the internal space utilization of the battery cell, and help improve the energy efficiency of the battery cell.

[0022] In some embodiments of the first aspect, a recess is formed on the side of the first wall facing the electrode assembly, the recess is disposed opposite to the first portion along the thickness direction, at least a portion of the tab is accommodated in the recess, and at least a portion of the first connection portion is accommodated in the recess.

[0023] The above technical solution accommodates at least part of the tab and the first connecting part in the recess, so that the tab and the first connecting part can make full use of the space formed by the height difference between the first part and the second part in the thickness direction, which is beneficial to reduce the size of the battery cell and increase the energy density of the battery cell.

[0024] In some embodiments of the first aspect, the projection of the electrode terminal along the first direction at least partially overlaps with the projection of the tab along the first direction.

[0025] This allows the electrode terminals and tabs to make better use of the space formed by the height difference between the first part and the second part in the first direction, which is beneficial to reducing the size of the battery cell and increasing the energy density of the battery cell.

[0026] In some embodiments of the first aspect, the second portion is located in the middle region of the first wall along the first direction.

[0027] The above technical solution enables the electrode terminals to be located in the middle area of ​​the first wall, which reduces the risk of the battery cell interfering with other structures during assembly and thus damaging the electrode terminals.

[0028] In some embodiments of the first aspect, the heat dissipation portion includes a plurality of first ribs, which are spaced apart along a second direction, and the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other.

[0029] The above technical solution can further increase the contact area between the heat dissipation part and the air, thereby further improving the overall heat dissipation capacity of the adapter component.

[0030] In some embodiments of the first aspect, a groove is provided on the main body, the position of which corresponds to the position of the electrode terminal, and the groove is recessed on the side of the main body facing away from the electrode terminal. The portion of the main body corresponding to the groove is welded to the electrode terminal to form a solder mark, which is accommodated within the groove.

[0031] The above technical solution introduces grooves that can accommodate solder marks between the main body and the electrode terminals, reducing the risk of solder marks damaging the electrode assembly and occupying internal space of the battery cell, thereby improving the reliability and energy density of the battery cell.

[0032] In some embodiments of the first aspect, the dimension of the heat dissipation portion along the thickness direction of the first wall is greater than or equal to the dimension along the thickness direction of the portion of the main body corresponding to the groove.

[0033] The greater the thickness of the heat dissipation part, the greater the heat dissipation area can be, thereby improving the overall heat dissipation capacity of the adapter component.

[0034] In some embodiments of the first aspect, the main body and the heat dissipation part are integrally formed.

[0035] On the one hand, the manufacturing process is simplified because there is no need to connect the main body and the heat dissipation unit through an additional connection process. On the other hand, compared to connecting the main body and the heat dissipation unit through an additional connection process, the integrated structure of the main body and the heat dissipation unit has higher structural strength.

[0036] In some embodiments of the first aspect, the housing includes an end cap and a housing having an opening, the end cap closing onto the opening, and the end cap being configured as a first wall.

[0037] Secondly, this application provides a battery device that includes a battery cell provided in any of the embodiments of the first aspect.

[0038] In some embodiments of the second aspect, the battery device further includes a heat exchange component disposed outside the battery cell and disposed opposite to the heat dissipation portion.

[0039] The heat exchange component and the heat dissipation part of the above technical solution are arranged opposite each other, which can quickly cool down the heat dissipation part, thereby effectively reducing the current-carrying temperature rise of the transfer component and improving the reliability and performance of the battery cell.

[0040] Thirdly, this application provides an electrical device that includes a battery cell provided in any embodiment of the first aspect or a battery device provided in any embodiment of the second aspect, wherein the battery cell or battery device is used to store or provide electrical energy.

[0041] 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

[0042] 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:

[0043] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0044] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application;

[0045] Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application;

[0046] Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0047] Figure 5 This is a schematic cross-sectional view of a battery cell provided in some embodiments of this application;

[0048] Figure 6 for Figure 5 A magnified view of the structure at point H;

[0049] Figure 7 This is a schematic diagram of the structure of a battery cell adapter provided in some embodiments of this application;

[0050] Figure 8 This is a schematic diagram of the structure of an adapter component for another battery cell provided in some embodiments of this application;

[0051] Figure 9 This is a schematic diagram of the structure of another battery cell adapter provided in some embodiments of this application.

[0052] The reference numerals in the detailed embodiments are as follows:

[0053] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing; 5b. Second housing; 6. Battery module; 7. Battery cell;

[0054] 10. Outer shell; 10a. End cap; 10b. Housing; 11. First wall; 111. First part; 112. Second part; 113. Recess;

[0055] 20. Electrode assembly; 21. Electrode tab; 22. Electrode body;

[0056] 30. Electrode terminals;

[0057] 40. Adapter components;

[0058] 41. Main body; 411. First connecting part; 412. Second connecting part; 413. Bending part; 414. Groove;

[0059] 42. Heat dissipation section; 421. First rib; 422. Second rib;

[0060] X, first direction; Y, second direction; Z, thickness direction. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application 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 drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0063] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0064] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0065] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0066] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0067] In this application, "multiple" means two or more (including two).

[0068] In this application, the term "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0069] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0070] In the development of battery technology, improving the reliability and performance of individual battery cells is a continuous research direction.

[0071] For example, with the development of the new energy industry, the demand for fast charging and high energy is increasing. Batteries are usually formed by connecting multiple battery cells in series or parallel. Each battery cell has a connecting component to electrically connect the electrode terminals and tabs. Under the demand for fast charging and high energy, the connecting components of the battery cells often need to carry higher currents. However, high currents can cause the temperature of the connecting components to increase significantly, directly affecting the reliability and performance of the individual battery cells.

[0072] In related technologies, a heat dissipation structure is typically provided between the tab connection and the post connection of the adapter component to improve the heat dissipation performance of the adapter component. However, the available space between the tab connection and the post connection of the adapter component is limited, resulting in unsatisfactory heat dissipation performance of the heat dissipation structure.

[0073] Based on the above considerations, this application designs a battery cell, which includes a casing, an electrode assembly, electrode terminals, and an adapter. The casing has a first wall, and the electrode assembly is housed within the casing. The electrode assembly includes tabs, and the electrode terminals are disposed on the first wall. The adapter includes a main body and a heat dissipation part. The main body is electrically connected to the tabs and the electrode terminals, and the heat dissipation part is connected to the end of the main body and extends in a direction away from the main body.

[0074] The above technical solution provides a larger layout space for the heat dissipation part by connecting the heat dissipation part to the end of the main body and extending it in a direction away from the main body. This helps to increase the contact area between the heat dissipation part and the air, thereby improving the overall heat dissipation capacity of the adapter component and effectively improving the reliability and performance of the battery cell.

[0075] The battery cells described in this application are applicable to battery devices and electrical equipment using battery devices. Electrical equipment can be devices that use battery devices as a power source or various energy storage systems that use battery devices as energy storage elements. Electrical equipment 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.

[0076] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0077] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0078] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0079] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0080] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0081] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0082] In some embodiments, the battery device 2 may include one or more battery cell assemblies for providing voltage and capacity.

[0083] A battery cell assembly may include multiple battery cells ( Figure 2 (Not shown), multiple battery cells are connected in series, parallel, or mixed connection through a busbar. Mixed connection refers to multiple battery cells being connected in both series and parallel.

[0084] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0085] As an example, a single battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0086] As an example, a battery cell can be a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0087] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module 6, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module 6 can be formed by bundling multiple battery cells together with cable ties.

[0088] In some embodiments, the battery device 2 may be a battery pack, which includes a housing 5 and one or more battery cell assemblies housed within the housing 5. As an example, the battery cell assembly may be a battery module 6, which can be housed within the housing by securing the battery module 6 to the housing. Alternatively, the battery cell assembly may be housed within the housing by directly securing multiple battery cells to the housing.

[0089] In some embodiments, the housing 5 is used to house individual battery cells, and the housing 5 can have various structures.

[0090] In some embodiments, the housing 5 may include a first housing 5a and a second housing 5b. The first housing 5a and the second housing 5b are fastened together to form a closed space inside the housing 5 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0091] In some embodiments, the housing 5 may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, forming an enclosed space inside the housing to accommodate individual battery cells. As an example, the frame may include multiple side beams.

[0092] In some embodiments, the housing 5 may be part of the vehicle's chassis structure. For example, a portion of the housing 5 may be at least a portion of the vehicle's floor, or a portion of the housing 5 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0093] In some embodiments, the battery device 2 may be an energy storage device.

[0094] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0095] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0096] Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application.

[0097] In some embodiments, such as Figure 3 As shown, there are multiple battery cells 7, which are first connected in series, parallel, or a combination of both to form a battery module 6. These battery modules 6 are then connected in series, parallel, or a combination of both to form a whole, which is housed within the casing.

[0098] Multiple battery cells 7 in battery module 6 can be electrically connected through a busbar to achieve parallel, series, or mixed connection of multiple battery cells 7 in battery module 6. There can be one or more busbars, each used to electrically connect at least two battery cells 7.

[0099] This application provides a battery cell that includes a housing and an electrode assembly housed within the housing.

[0100] In some embodiments, the outer casing may be a steel casing, an aluminum casing, or a composite metal casing (such as a copper-aluminum composite casing).

[0101] The outer shell can be a hollow structure, with an internal cavity for accommodating the electrode assembly and electrolyte.

[0102] In some embodiments, the casing of the battery cell is a cylindrical casing, a square casing, a prismatic casing, or a casing of other shapes.

[0103] In some embodiments, the housing includes a housing and an end cap, the housing having an opening and the end cap being connected to the housing and covering the opening;

[0104] The housing is a component used to fit the end cap to form the internal cavity of the battery cell. The formed internal cavity can be used to house the electrode assembly, electrolyte, and other components.

[0105] The housing and end cap can be separate components. For example, an opening can be provided on the housing, and the end cap can be used to close the opening to form an internal cavity for the battery cell.

[0106] The housing can come in various shapes and sizes, such as cuboid or cylindrical. Specifically, the shape of the housing can be determined based on the specific shape and size of the electrode assembly. The housing can be made of various materials, such as copper, iron, aluminum, stainless steel, and aluminum alloy.

[0107] The shape of the end cap can be adapted to the shape of the housing to fit the housing. The material of the end cap can be the same as or different from that of the housing. Optionally, the end cap can be made of a material with a certain degree of hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.), so that the end cap is not easily deformed when subjected to compression and impact, enabling the battery cell to have higher strength and improve reliability.

[0108] The end caps are attached to the housing by welding, bonding, snap-fitting, or other means.

[0109] The housing may be open at one end or at both ends. In some examples, the housing may be a structure with an opening on one side, with one end cap fitting over the housing. In other examples, the housing may be a structure with openings on both sides, with two end caps fitting over the two openings of the housing, respectively.

[0110] Electrode assemblies are the components within a single battery cell where electrochemical reactions occur. The casing may contain one or more electrode assemblies.

[0111] In some embodiments, the electrode assembly includes a positive electrode and a negative electrode, wherein the positive electrode and the negative electrode have opposite polarities.

[0112] In some embodiments, the positive electrode may include a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector.

[0113] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive electrode film layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0114] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0115] As an example, the positive electrode film layer includes a positive electrode active material, which may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0116] In some embodiments, the negative electrode may include a negative current collector.

[0117] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0118] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector.

[0119] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode film layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0120] As an example, the negative electrode film layer includes a negative electrode active material, which may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0121] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0122] In some embodiments, the electrode assembly further includes a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrode plates, serving both to transport ions and to isolate the positive and negative electrodes.

[0123] In some embodiments, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0124] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0125] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0126] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0127] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0128] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0129] In some implementations, the electrode assembly is a stacked structure.

[0130] As an example, multiple positive and negative electrode plates can be set, with multiple positive and multiple negative electrode plates stacked alternately. As an example, multiple positive electrode plates can be set, and negative electrode plates are folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0131] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0132] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0133] In some embodiments, the positive current collector may include a positive tab, and the negative current collector may include a negative tab. The positive and negative tabs can be used to transmit current. As an example, at least a portion of the positive tab is not coated with a positive film layer, and at least a portion of the negative tab is not coated with a negative film layer.

[0134] In some embodiments, the electrode assembly is a wound structure. The positive electrode tab is wound multiple turns along the winding direction. Optionally, the end of the positive electrode tab is bent by a flattening or smoothing process to form a multi-layered structure stacked in the axial direction of the electrode assembly. Optionally, the positive electrode tab is annular.

[0135] In some embodiments, the negative electrode tab is wound multiple turns along the winding direction. Optionally, the end of the negative electrode tab is bent by a flattening or smoothing process to form a multi-layered structure stacked in the axial direction of the electrode assembly. The negative electrode tab is annular.

[0136] In some embodiments, the electrode assembly includes an electrode body. As an example, the electrode body includes a positive electrode film, a portion of a positive current collector covered by the positive electrode film, a negative electrode film, and a portion of a negative current collector covered by the negative electrode film.

[0137] The positive and negative electrodes can be drawn from the same end of the electrode body, or they can be drawn from opposite ends of the electrode body.

[0138] In some embodiments, a battery cell includes a positive electrode lead and a negative electrode lead, wherein the positive electrode lead is electrically connected to a positive electrode plate and the negative electrode lead is electrically connected to a negative electrode plate.

[0139] The positive and negative leads are used to connect to the external circuit to enable charging or discharging of the battery cells.

[0140] In some embodiments, the positive lead-out portion includes a positive terminal. At least a portion of the positive terminal is exposed to the outside of the battery cell to facilitate connection with a busbar.

[0141] As an example, the positive terminal may be a separately molded component that is mounted on the housing. Alternatively, the positive terminal may also be part of the housing.

[0142] In some examples, the positive terminal is directly connected to the positive plate; in other examples, the positive terminal and the positive plate are indirectly connected through other conductive structures, such as a positive adapter plate.

[0143] In some embodiments, the positive terminal is attached to the end cap by welding, riveting, snap-fitting, or other means.

[0144] In some embodiments, the negative lead-out portion includes a negative terminal. At least a portion of the negative terminal is exposed to the outside of the battery cell to facilitate connection with a busbar.

[0145] As an example, the negative terminal can be a separately molded component that is mounted on the housing. Alternatively, the negative terminal can also be part of the housing.

[0146] In some examples, the negative terminal is directly connected to the negative electrode plate; in other examples, the negative lead-out section also includes other conductive structures connecting the negative terminal and the negative electrode plate, such as a negative electrode adapter plate.

[0147] In some embodiments, the negative terminal is attached to the end cap by welding, riveting, snap-fitting, or other means.

[0148] Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application. Figure 5 This is a schematic cross-sectional view of a single battery cell provided in some embodiments of this application. Figure 6 for Figure 5 A magnified view of the local structure at point H. Figure 7 This is a schematic diagram of the structure of a battery cell adapter provided in some embodiments of this application.

[0149] Continue to refer to Figures 4 to 7 This application provides a battery cell 7, which includes a housing 10, an electrode assembly 20, electrode terminals 30, and an adapter 40. The housing 10 has a first wall 11, and the electrode assembly 20 is housed within the housing 10. The electrode assembly 20 includes tabs 21, and the electrode terminals 30 are disposed on the first wall 11. The adapter 40 includes a main body 41 and a heat dissipation part 42. The main body 41 is electrically connected to the tabs 21 and the electrode terminals 30, and the heat dissipation part 42 is connected to the end of the main body 41 and extends in a direction away from the main body 41.

[0150] In the technical solution of this application embodiment, the adapter 40 is used to electrically connect the tab 21 and the electrode terminal 30 to transmit the electrical energy of the battery cell 7.

[0151] The main body 41 of the adapter 40 serves as the part that electrically connects the tab 21 and the electrode terminal 30. The heat dissipation part 42 is mainly used to increase the overall contact area between the adapter 40 and the air, so as to increase the heat dissipation capacity of the adapter 40.

[0152] The main body 41 may be directly connected to the electrode tab 21, or it may be indirectly connected to the electrode tab 21 through other components. As an example, the main body 41 is welded to the electrode tab 21.

[0153] The main body 41 may be directly connected to the electrode terminal 30, or it may be indirectly connected to the electrode terminal 30 through other components. As an example, the main body 41 is soldered to the electrode terminal 30.

[0154] As an example, the side surface of the main body 41 facing the first wall 11 is connected to the electrode terminal 30, and the side surface of the main body 41 facing the electrode assembly 20 is connected to the tab 21.

[0155] The heat dissipation part 42 can be detachably connected to the main body part 41, or it can be integrally formed on the main body part 41. The heat dissipation part 42 can be directly connected to the main body part 41, or it can be constrained to the main body part 41 by other components. As an example, the connection method between the heat dissipation part 42 and the main body part 41 can be, but is not limited to, bolt connection, welding, riveting, snap-fit ​​or bonding.

[0156] The heat dissipation part 42 and the main body part 41 may be made of the same material or different materials. As an example, the heat dissipation part 42 and the main body part 41 may be made of at least one of the following materials: copper, aluminum, and stainless steel.

[0157] In some examples, the heat dissipation part 42 and the main body part 41 are made of the same material, which helps to simplify the manufacturing process and reduce costs.

[0158] In some examples, the heat dissipation part 42 and the main body part 41 are made of different materials, and the thermal conductivity of the material of the heat dissipation part 42 is greater than that of the material of the main body part 41, which can further improve the heat dissipation performance of the heat dissipation part 42.

[0159] Optionally, the adapter 40 may be, but is not limited to, a plate-like structure or a block-like structure.

[0160] In some examples, both the main body 41 and the heat dissipation part 42 are plate-like structures.

[0161] The main function of the heat dissipation part 42 is to increase the overall contact area between the adapter part 40 and the air, thereby improving the overall heat dissipation capacity of the adapter part 40. For example, the heat dissipation part 42 is provided at the end of the main body part 41, which can provide a larger arrangement space for the heat dissipation part 42; the heat dissipation part 42 extends in a direction away from the main body part 41, which can increase the overall contact area between the adapter part 40 and the air, thereby improving the overall heat dissipation capacity of the adapter part 40.

[0162] Understandably, the main body 41, as the part electrically connecting the tab 21 and the electrode terminal 30, needs to simultaneously perform the function of connecting to both the tab 21 and the electrode terminal 30. Furthermore, it needs to minimize the current transmission path between the tab 21 and the electrode terminal 30, resulting in a relatively compact geometric arrangement of the main body 41. This leads to a very limited effective area on the main body 41 available for a heat dissipation structure. If a heat dissipation structure is further constructed within the limited structural space of the main body 41, the heat dissipation area of ​​the structure is limited by space constraints, resulting in poor overall heat dissipation capacity of the adapter component 40.

[0163] Thus, the above technical solution provides a larger layout space for the heat dissipation part 42 by connecting the heat dissipation part 42 to the end of the main body part 41 and extending it in a direction away from the main body part 41. This helps to increase the contact area between the heat dissipation part 42 and the air, thereby improving the overall heat dissipation capacity of the adapter part 40 and effectively improving the reliability and performance of the battery cell 7.

[0164] In some embodiments, the main body 41 includes a first connecting portion 411 and a second connecting portion 412 connected together. The first connecting portion 411 is electrically connected to the tab 21, the second connecting portion 412 is electrically connected to the electrode terminal 30, and the heat dissipation portion 42 is connected to the end of the second connecting portion 412 away from the first connecting portion 411.

[0165] The first connecting part 411 may be directly connected to the second connecting part 412, or it may be indirectly connected to the second connecting part 412 through other components.

[0166] The first connecting part 411 and the second connecting part 412 may be made of the same material or different materials.

[0167] In some examples, the first connector 411 and the second connector 412 are made of the same material, which helps to simplify the manufacturing process and reduce costs.

[0168] In some examples, both the first connecting part 411 and the second connecting part 412 are plate-like structures.

[0169] It is understandable that the tab 21 has a smaller thickness than the electrode terminal 30. In order to optimize the conductivity between the tab 21 and the first connection part 411, it is usually necessary to increase the contact area between the tab 21 and the first connection part 411 as much as possible to reduce the interface resistance and improve the overcurrent capability.

[0170] In this way, by connecting the heat dissipation part 42 to the end of the second connection part 412 away from the first connection part 411, the space occupied by the heat dissipation part 42 near the tab 21 for the first connection part 411 is avoided to a certain extent, thereby reducing the impact of the introduction of the heat dissipation part 42 on the overcurrent performance between the tab 21 and the first connection part 411, and further improving the performance of the battery cell 7.

[0171] The above technical solution not only improves the heat dissipation capacity of the adapter component 40, but also maintains sufficient contact between the tab 21 and the adapter component 40, thereby optimizing the current flow capacity between the tab 21 and the first connection part 411 and improving the performance of the battery cell 7.

[0172] In some embodiments, the thermal conductivity of the heat dissipation portion 42 is greater than that of the main body portion 41, which can further improve the heat dissipation performance of the heat dissipation portion 42.

[0173] Thermal conductivity, also known as thermal conductivity coefficient, is a physical quantity that measures the ability of an object to transfer heat. It represents the amount of heat transferred through a unit heat-conducting surface per unit time under a unit temperature gradient.

[0174] The difference in thermal conductivity between the heat dissipation part 42 and the main body part 41 can be achieved by adjusting the materials of the two parts, or by adjusting their structural forms.

[0175] In some examples, the heat dissipation part 42 and the main body 41 may be made of different materials, with the thermal conductivity of the material of the heat dissipation part 42 being greater than that of the material of the main body 41, so that the thermal conductivity of the heat dissipation part 42 is greater than that of the main body 41.

[0176] In some examples, the heat dissipation part 42 and the main body part 41 may be made of the same material, and the contact area between the heat dissipation part 42 and the air is larger than the contact area between the main body part 41 and the air, so that the thermal conductivity of the heat dissipation part 42 is greater than that of the main body part 41.

[0177] For example, the thermal conductivity of the heat sink 42 and the main body 41 can be measured using a steady-state testing method. As an example, the thermal conductivity of the heat sink 42 and the main body 41 is measured using a heat shield method. Specifically, samples of the heat sink 42 and the main body 41 are sandwiched between a heating plate and a cold plate, the temperature of the heating plate is adjusted, and the heat flow and temperature gradient are measured under steady-state conditions. As another example, the thermal conductivity of the heat sink 42 and the main body 41 is measured using a heat flow meter method. Specifically, a stable temperature gradient is generated across the samples of the heat sink 42 and the main body 41, and the heat flow through the samples is measured using a standard heat flow sensor with known thermal characteristics.

[0178] In some embodiments, the surface of the heat dissipation part 42 is configured as a non-planar structure, such as a wavy structure or a sawtooth structure, to further increase the contact area between the heat dissipation part 42 and the air.

[0179] For example, when the heat dissipation part 42 is connected to the end of the main body part 41 along the first direction X, and the heat dissipation part 42 extends away from the main body part 41 along the first direction X, the projection shape of the two side surfaces of the heat dissipation part 42 opposite to each other along the thickness direction Z along the second direction Y can be wavy or sawtooth, or the projection shape of the two side surfaces of the heat dissipation part 42 opposite to each other along the thickness direction Z can be wavy or sawtooth, and the first direction X, the second direction Y and the thickness direction Z are perpendicular to each other.

[0180] Figure 8 This is a schematic diagram of the structure of an adapter 40 for another battery cell 7 provided in some embodiments of this application.

[0181] Continue to refer to Figure 8 In some embodiments, the heat dissipation part 42 includes a plurality of first ribs 421, which are spaced apart from each other.

[0182] In some examples, the plurality of first ribs 421 may be spaced Z apart along the thickness direction of the first wall 11.

[0183] In other examples, the plurality of first ribs 421 may also be spaced apart along a first direction X, which intersects the thickness direction Z of the first wall 11.

[0184] Multiple first ribs 421 are spaced apart from each other, so that there are gaps between the multiple first ribs 421, which can further increase the contact area between the entire heat dissipation part 42 and the air.

[0185] As an example, the gap between the plurality of first ribs 421 can penetrate the heat dissipation part 42 in a direction perpendicular to the arrangement direction of the plurality of first ribs 421.

[0186] The structural shape and size of multiple first ribs 421 can be the same or different.

[0187] For example, the number of first ribs 421 can be two, three, four, five or more, depending on the actual application environment.

[0188] The above technical solution can further increase the contact area between the heat dissipation part 42 and the air, so as to further improve the overall heat dissipation capacity of the adapter 40.

[0189] In some embodiments, the plurality of first ribs 421 are arranged in parallel to each other, which can simplify the overall manufacturing process and reduce costs.

[0190] In some embodiments, the first rib 421 is configured as a wavy structure or a sawtooth structure.

[0191] For example, the first rib 421 extends in a wavy or sawtooth shape along the direction away from the main body 41. That is, when multiple first ribs 421 are spaced apart along the first direction X, the first rib 421 may have a wavy or sawtooth shape projected along the thickness direction Z, and the first rib 421 may also have a wavy or sawtooth shape projected along the second direction Y, with the first direction X, the second direction Y, and the thickness direction Z being perpendicular to each other.

[0192] The above technical solution can further increase the contact area between the heat dissipation part 42 and the air, so as to further improve the overall heat dissipation capacity of the adapter 40.

[0193] Figure 9 This is a schematic diagram of the structure of an adapter 40 for another battery cell 7 provided in some embodiments of this application.

[0194] Continue to refer to Figure 9In some embodiments, the heat dissipation part 42 further includes a plurality of second ribs 422, which are spaced apart and intersect with the plurality of first ribs 421 to form a mesh structure.

[0195] For example, the arrangement direction of the plurality of second ribs 422 intersects with the arrangement direction of the plurality of first ribs 421.

[0196] In some examples, multiple first ribs 421 may be spaced apart along a first direction X, and multiple second ribs 422 may be spaced apart along a second direction Y, with the first direction X and the second direction Y being perpendicular to the thickness direction Z of the first wall 11.

[0197] In other examples, the plurality of second ribs 422 may be spaced apart along the first direction X, and the plurality of first ribs 421 may be spaced apart along the second direction Y, wherein the first direction X and the second direction Y are perpendicular to the thickness direction Z of the first wall 11.

[0198] The first rib 421 and the second rib 422 may have the same shape and different dimensions.

[0199] The structural shape and size of multiple second ribs 422 can be the same or different.

[0200] For example, the number of second ribs 422 can be two, three, four, five or more, depending on the actual application environment.

[0201] As an example, the multiple second ribs 422 can be spaced apart along the first direction X, and the multiple first ribs 421 can be spaced apart along the second direction Y. The multiple second ribs 422 and the multiple first ribs 421 intersect each other to form gaps in the grid structure that penetrate the heat dissipation part 42 along the thickness direction Z. The first direction X and the second direction Y are perpendicular to the thickness direction Z of the first wall 11.

[0202] The above technical solution forms a grid structure by intersecting multiple second ribs 422 and multiple first ribs 421, which can not only further increase the heat dissipation area of ​​the heat dissipation part 42 to further improve the overall heat dissipation capacity of the adapter 40, but also improve the structural strength of the heat dissipation part 42 and improve the reliability of the adapter 40.

[0203] In some embodiments, the plurality of second ribs 422 are arranged in parallel to each other, which can simplify the overall manufacturing process and reduce costs.

[0204] In some embodiments, the electrode assembly 20 further includes an electrode body 22, with a tab 21 connected to one end of the electrode body 22 facing the first wall 11. A connecting member 40 is located between the first wall 11 and the electrode assembly 20, and a heat dissipation portion 42 is connected to the end of the body portion 41 along a first direction X, the first direction X intersecting the thickness direction Z of the first wall 11.

[0205] The electrode body 22 includes at least a portion of the insulating element along the thickness direction Z, a region of the positive electrode sheet covered by the positive active material along the thickness direction Z, and a region of the negative electrode sheet covered by the negative active material along the thickness direction Z.

[0206] For example, one side surface of the adapter 40 along the thickness direction Z is connected to the tab 21, and the other side surface is connected to the electrode terminal 30. The thickness direction Z of the first wall 11 can also be understood as the height direction of the electrode assembly 20, and the first direction X can also be understood as the length direction of the electrode assembly 20.

[0207] It is understandable that, since the tab 21 and the electrode terminal 30 in this embodiment are located on the same side of the electrode body 22, the geometric arrangement of the body 41 is more compact, resulting in a more limited effective area on the body 41 that can be used to set up a heat dissipation structure.

[0208] The above-mentioned technical solution has a large arrangement area along the first direction X in the space between the first wall 11 and the electrode assembly 20. The heat dissipation part 42 is connected to the end of the main body part 41 along the first direction X, which can provide a large arrangement space for the heat dissipation part 42, and helps to increase the contact area between the heat dissipation part 42 and the air, so as to improve the overall heat dissipation capacity of the adapter 40, thereby effectively improving the reliability and performance of the battery cell 7.

[0209] In some embodiments, the main body 41 includes a first connecting portion 411 and a second connecting portion 412 connected together. The first connecting portion 411 and the second connecting portion 412 are disposed along a first direction X. The first connecting portion 411 is electrically connected to the tab 21, the second connecting portion 412 is electrically connected to the electrode terminal 30, and the heat dissipation portion 42 is connected to the end of the second connecting portion 412 away from the first connecting portion 411.

[0210] The first connecting part 411, the second connecting part 412 and the heat dissipation part 42 of the above technical solution are arranged along the first direction X, and the heat dissipation part 42 is connected to the end of the second connecting part 412 away from the first connecting part 411. This allows the heat dissipation part 42 to be further away from the space near the tab 21 where the first connecting part 411 is arranged, thereby further reducing the impact of the introduction of the heat dissipation part 42 on the current flow performance between the tab 21 and the first connecting part 411.

[0211] In some embodiments, the first wall 11 includes a first portion 111 and a second portion 112. Along the thickness direction Z, the second portion 112 is closer to the electrode assembly 20 than the first portion 111, and the electrode terminal 30 is disposed on the second portion 112.

[0212] For example, along the thickness direction Z, the first portion 111 has a first surface facing away from the electrode assembly 20 and a second surface facing the electrode assembly 20, and the second portion 112 protrudes from the second surface in a direction close to the electrode assembly 20. A recessed region is formed on the side of the first wall 11 facing away from the electrode assembly 20, and along the thickness direction Z, the recessed region is disposed opposite to the second portion 112, and at least a portion of the electrode terminal 30 is accommodated in the recessed region.

[0213] The recessed area can be formed on the first wall 11 by means of grooving, stamping, casting, bending, etc. The first wall 11 can be a one-piece molded structure. For example, the first wall 11 can be a one-piece molded structure formed by one-piece molding methods such as stamping and casting.

[0214] In some examples, along the thickness direction Z, the electrode terminal 30 may protrude from the surface of the second portion 112 away from the electrode assembly 20. Of course, the surface of the electrode terminal 30 away from the electrode assembly 20 may also be flush with the surface of the second portion 112 away from the electrode assembly 20, or the surface of the electrode terminal 30 away from the electrode assembly 20 may be closer to the electrode assembly 20 than the surface of the second portion 112 away from the electrode assembly 20.

[0215] In an embodiment where the battery cell 7 includes two electrode terminals 30, both electrode terminals 30 may be disposed in the second portion 112; or one electrode terminal 30 may be disposed in the second portion 112 and the other electrode terminal 30 may be disposed in the first portion 111.

[0216] By placing the electrode terminal 30 in the second part 112, the electrode terminal 30 can make full use of the space formed by the height difference between the first part 111 and the second part 112 in the thickness direction Z, which is beneficial to reduce the size of the battery cell 7 and increase the energy density of the battery cell 7.

[0217] In some examples, along the thickness direction Z, the first portion 111 protrudes from the electrode terminal 30 away from the surface of the electrode assembly 20. That is, there is a height difference between the first portion 111 and the electrode terminal 30 in the thickness direction Z, and the surface of the first portion 111 away from the electrode assembly 20 is further away from the electrode assembly 20 than the surface of the electrode terminal 30 away from the electrode assembly 20.

[0218] By having the first portion 111 protrude from the surface of the electrode terminal 30 away from the electrode assembly 20 along the thickness direction Z, a space is formed between the portion of the first portion 111 that protrudes from the surface of the electrode terminal 30 away from the electrode assembly 20 and the electrode terminal 30. This space can be used to accommodate other structures (such as busbar components) connected to the electrode terminal 30, making it easier to electrically connect the battery cell 7 to other structures, reducing the risk of interference when the battery cell 7 is electrically connected to other structures, and improving the stability of the electrical connection.

[0219] The main body 41 also includes a bending portion 413, which is connected to the first connecting portion 411 and bends along the thickness direction Z toward the electrode assembly 20. The second connecting portion 412 is connected to the end of the bending portion 413 away from the first connecting portion 411.

[0220] The introduction of the bending portion 413 enables the main body portion 41 to form a Z-shaped structure, which can better adapt to the structure of the first wall 11 in this embodiment, improve the space utilization rate inside the battery cell 7, and help improve the energy efficiency of the battery cell 7.

[0221] In some embodiments, a recess 113 is formed on the side of the first wall 11 facing the electrode assembly 20. Along the thickness direction Z, the recess 113 is disposed opposite to the first portion 111, and at least a portion of the tab 21 is accommodated in the recess 113.

[0222] Along the thickness direction Z, the second portion 112 has a third surface facing away from the electrode assembly 20 and a fourth surface facing the electrode assembly 20. The first portion 111 protrudes from the third surface in a direction away from the electrode assembly 20, and the recess 113 is recessed from the fourth surface in a direction away from the electrode assembly 20. The recess 113 and the first portion 111 are disposed opposite each other, and along the thickness direction Z, the projection of the first portion 111 can be located within the projection of the recess 113. The wall shape of the recess 113 located on the first wall 11 can match the shape of the outer surface of the first portion 111 in the thickness direction Z.

[0223] The recess 113 can be formed on the first wall 11 by means of grooving, stamping, casting, bending, etc. The tab 21 can be completely accommodated in the recess 113, or it can be partially accommodated in the recess 113.

[0224] The above technical solution accommodates at least a portion of the tab 21 within the recess 113, thereby enabling the tab 21 to fully utilize the space formed by the height difference between the first portion 111 and the second portion 112 in the thickness direction Z, which is beneficial for reducing the size of the battery cell 7 and increasing the energy density of the battery cell 7.

[0225] In addition, the adapter 40 connects the tab 21 and the electrode terminal 30, which facilitates the electrical connection between the tab 21 and the electrode terminal 30 located in the recess 113.

[0226] In some embodiments, a portion of the adapter 40 is accommodated within the recess 113, thereby enabling the adapter 40 to fully utilize the space formed by the height difference between the first portion 111 and the second portion 112 in the thickness direction Z, which is beneficial for reducing the size of the battery cell 7 and increasing the energy density of the battery cell 7.

[0227] In some embodiments, at least a portion of the first connecting portion 411 is accommodated within the recess 113, thereby enabling the first connecting portion 411 to make full use of the space formed by the height difference between the first portion 111 and the second portion 112 in the thickness direction Z, which is beneficial for reducing the size of the battery cell 7 and increasing the energy density of the battery cell 7.

[0228] In some embodiments, the projection of the electrode terminal 30 along the first direction X at least partially overlaps with the projection of the tab 21 along the first direction X.

[0229] This allows the electrode terminals 30 and tabs 21 to make fuller use of the space formed by the height difference between the first part 111 and the second part 112 in the thickness direction Z, which is beneficial to reducing the size of the battery cell 7 and increasing the energy density of the battery cell 7.

[0230] In some embodiments, the second portion 112 is located in the middle region of the first wall 11 along the first direction X.

[0231] The second part 112 of this application is located in the middle region of the first wall 11 along the first direction X. This includes not only the case where the second part 112 is absolutely located in the middle region of the first wall 11 along the first direction X, but also the case where the second part 112 is generally located in the middle region of the first wall 11 along the first direction X as commonly understood in engineering.

[0232] The above technical solution enables the electrode terminal 30 to be located in the middle region of the first wall 11, which reduces the risk of the battery cell 7 interfering with other structures during the assembly process and causing damage to the electrode terminal 30.

[0233] For example, the first wall 11 includes two first portions 111 and a second portion 112, which are disposed along a first direction X, and the second portion 112 is connected between the two first portions 111.

[0234] The recesses 113 corresponding to the two first parts 111 can respectively accommodate two tabs 21 with opposite polarities, so that the tabs 21 with opposite polarities are separated by the second part 112, reducing the risk of short circuit of the battery cell 7 and improving the reliability of the battery cell 7.

[0235] In some embodiments, the heat dissipation part 42 includes a plurality of first ribs 421, which are spaced apart along the second direction Y, and the first direction X, the second direction Y and the thickness direction Z of the first wall 11 are perpendicular to each other.

[0236] For example, the first rib 421 is connected to the end of the main body 41 along the first direction X and extends along the first direction X and away from the main body 41. A plurality of first ribs 421 are spaced apart along the second direction Y, which can also be understood as the thickness direction Z of the electrode assembly 20.

[0237] In some embodiments, a plurality of first ribs 421 are spaced apart along the second direction Y, and the gaps between the plurality of first ribs 421 can penetrate the heat dissipation portion 42 along the thickness direction Z.

[0238] In some embodiments, a groove 414 is provided on the main body 41, the position of the groove 414 corresponding to the position of the electrode terminal 30, and the groove 414 is recessed on the side surface of the main body 41 facing away from the electrode terminal 30. The portion of the main body 41 corresponding to the groove 414 is welded to the electrode terminal 30 to form a solder mark, which is accommodated in the groove 414.

[0239] For example, the position of the groove 414 corresponds to the position of the electrode terminal 30, meaning that the projection of the groove 414 along the thickness direction Z at least partially overlaps with the projection of the electrode terminal 30 along the thickness direction Z.

[0240] During the welding process between the adapter 40 and the electrode terminal 30, the adapter 40 and the electrode terminal 30 are first positioned so that the groove 414 corresponds to the electrode terminal 30. Then, the welding machine extends from the side of the main body 41 away from the electrode terminal 30 into the groove 414 to weld the part of the main body 41 corresponding to the groove 414 to the electrode terminal 30 and form a solder mark.

[0241] The above technical solution introduces a groove 414, which can accommodate the solder marks between the main body 41 and the electrode terminal 30, reducing the risk of solder marks damaging the electrode assembly 20 and occupying the internal space of the battery cell 7, thereby improving the reliability and energy density of the battery cell 7.

[0242] In some embodiments, the main body 41 is further provided with a protrusion, the position of which corresponds to the position of the groove 414, and the protrusion protrudes from the side surface of the main body 41 facing the electrode terminal 30.

[0243] For example, a recessed area may be formed locally on the main body 41 by a stamping process. The recessed area is manifested as a groove 414 on the side of the main body 41 facing away from the electrode terminal 30, and as a protrusion on the side of the main body 41 facing the electrode terminal 30.

[0244] The protrusions in the above-mentioned technical solution can improve the strength and stability of the connection between the main body 41 and the electrode terminal 30. Furthermore, the cooperation between the groove 414 and the protrusions not only simplifies the manufacturing process of the groove 414, but also further improves the structural strength of the adapter 40.

[0245] In some embodiments, a groove 414 is provided on the second connecting portion 412.

[0246] In some embodiments, the dimension of the heat dissipation portion 42 along the thickness direction Z of the first wall 11 is greater than or equal to the dimension of the portion of the main body portion 41 corresponding to the groove 414 along the thickness direction Z.

[0247] The greater the thickness of the heat dissipation part 42, the greater the heat dissipation area of ​​the heat dissipation part 42 can be, thereby improving the overall heat dissipation capacity of the adapter part 40.

[0248] In some embodiments, the main body 41 and the heat dissipation part 42 are integrally formed structures.

[0249] On the one hand, the manufacturing process is simplified because there is no need to connect the main body 41 and the heat dissipation part 42 through an additional connection process. On the other hand, compared with connecting the main body 41 and the heat dissipation part 42 through an additional connection process, the integrated structure of the main body 41 and the heat dissipation part 42 has higher structural strength.

[0250] In some embodiments, the housing 10 includes an end cap 10a and a housing 10b, the housing 10b having an opening, the end cap 10a closing the opening, and the end cap 10a being configured as a first wall 11.

[0251] According to some embodiments of this application, this application also provides a battery device including a battery cell 7 of any of the above schemes.

[0252] In some embodiments, the battery device further includes a heat exchange component disposed outside the battery cell 7 and opposite to the heat dissipation portion 42.

[0253] Exemplarily, a heat exchange component may be thermally connected (e.g., attached) to at least a portion of the battery cell 7, and a heat exchange medium flows within the heat exchange component and exchanges heat with the battery cell 7 through the sidewall of the heat exchange component. When the temperature of the battery cell 7 is too high, the heat exchange component can cool the battery cell 7; when the temperature of the battery cell 7 is too low, the heat exchange component can keep the battery cell 7 warm to improve the battery's lifespan.

[0254] As an example, the heat exchange component has channels inside, which are used to contain the heat exchange medium. The sidewall of the heat exchange component refers to the part that encloses the channels.

[0255] The channels inside the heat exchange components can extend in a straight line or along a curve, depending on the actual application environment.

[0256] In some examples, there can be multiple heat exchange components, which can be connected by connecting pipes to achieve connection between the heat exchange components and circulation of the heat exchange medium.

[0257] Optionally, the heat exchange medium can be a liquid or a gas, wherein the liquid can be, but is not limited to, water, hot oil, ethylene glycol and alcohol; and the gas can be, but is not limited to, air, nitrogen or hydrogen.

[0258] The heat exchange component and the heat dissipation part 42 of the above technical solution are arranged opposite to each other, which can quickly cool down the heat dissipation part 42, thereby effectively reducing the current-carrying temperature rise of the transfer component 40 and improving the reliability and performance of the battery cell 7.

[0259] For example, the heat exchange component is disposed opposite to the heat dissipation part 42 along the thickness direction Z of the wall of the housing 10.

[0260] In some embodiments, the heat exchange component is disposed on the outer side of the first wall 11, and the heat exchange component is thermally connected (e.g., attached) to the first wall 11. Along the thickness direction Z of the first wall 11, the heat exchange component is disposed opposite to the heat dissipation part 42.

[0261] According to some embodiments of this application, this application also provides an electrical device, including a battery cell 7 or a battery device of any of the above schemes, wherein the battery cell 7 or the battery device is used to store or provide electrical energy.

[0262] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. All technical features and optional technical features of this application can be combined to form new technical solutions.

[0263] To better understand the battery cell 7 provided in the embodiments of this application, based on the same inventive concept, embodiments of the battery cell 7 in practical applications are provided here for illustration.

[0264] This application provides a battery cell 7, which includes a housing 10, an electrode assembly 20, electrode terminals 30, and an adapter 40. The housing 10 has a first wall 11, which includes a first portion 111 and a second portion 112. Along the thickness direction Z of the first wall 11, the second portion 112 is closer to the electrode assembly 20 than the first portion 111, and the electrode terminals 30 are disposed in the second portion 112. The electrode assembly 20 is housed within the housing 10 and includes an electrode body 22 and a tab 21. The tab 21 is connected to the end of the electrode body 22 facing the first wall 11.

[0265] The adapter 40 is located between the first wall 11 and the electrode assembly 20. The adapter 40 includes a main body 41 and a heat dissipation part 42. The main body 41 includes a first connecting part 411, a second connecting part 412, and a bending part 413 connected together. The first connecting part 411 and the second connecting part 412 are arranged along a first direction X. The bending part 413 is connected to the first connecting part 411 and bends along the thickness direction Z close to the electrode assembly 20. The second connecting part 412 is connected to the end of the bending part 413 away from the first connecting part 411. The first connecting part 411 is electrically connected to the tab 21, and the second connecting part 412 is electrically connected to the electrode terminal 30. The heat dissipation part 42 is connected to the end of the second connecting part 412 away from the first connecting part 411 and extends in a direction away from the main body 41. The heat dissipation part 42 includes a plurality of first ribs 421, which are spaced apart along a second direction Y. The first direction X, the second direction Y, and the thickness direction Z of the first wall 11 are perpendicular to each other.

[0266] The above technical solution not only improves the heat dissipation capacity of the adapter component 40, but also maintains sufficient contact between the tab 21 and the adapter component 40, thereby optimizing the current flow capacity between the tab 21 and the first connection part 411 and improving the performance of the battery cell 7.

[0267] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0268] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer shell has a first wall; An electrode assembly, housed within the housing, the electrode assembly including tabs; Electrode terminals are disposed on the first wall; The adapter includes a main body and a heat dissipation part. The main body is electrically connected to the tab and the electrode terminal, and the heat dissipation part is connected to the end of the main body and extends in a direction away from the main body.

2. The battery cell according to claim 1, characterized in that, The main body includes a first connecting part and a second connecting part connected together, the first connecting part being electrically connected to the tab, and the second connecting part being electrically connected to the electrode terminal; The heat dissipation part is connected to the end of the second connecting part away from the first connecting part.

3. The battery cell according to claim 1, characterized in that, The thermal conductivity of the heat dissipation part is greater than that of the main body part.

4. The battery cell according to claim 1, characterized in that, The heat dissipation section includes a plurality of first ribs, which are spaced apart from each other.

5. The battery cell according to claim 4, characterized in that, The first rib is configured as a wavy structure or a sawtooth structure.

6. The battery cell according to claim 4, characterized in that, The heat dissipation section also includes a plurality of second ribs, which are spaced apart and intersect with the plurality of first ribs to form a grid structure.

7. The battery cell according to claim 1, characterized in that, The electrode assembly further includes an electrode body, and the tab is connected to the end of the electrode body facing the first wall; The adapter is located between the first wall and the electrode assembly, and the heat dissipation part is connected to the end of the main body along a first direction, which intersects the thickness direction of the first wall.

8. The battery cell according to claim 7, characterized in that, The main body includes a first connecting part and a second connecting part connected together. The first connecting part and the second connecting part are arranged along the first direction. The first connecting part is electrically connected to the tab, and the second connecting part is electrically connected to the electrode terminal. The heat dissipation part is connected to the end of the second connecting part away from the first connecting part.

9. The battery cell according to claim 8, characterized in that, The first wall includes a first portion and a second portion. Along the thickness direction, the second portion is closer to the electrode assembly than the first portion, and the electrode terminals are disposed in the second portion. The main body also includes a bending portion, which is connected to the first connecting portion and bends along the thickness direction close to the electrode assembly. The second connecting portion is connected to the end of the bending portion away from the first connecting portion.

10. The battery cell according to claim 9, characterized in that, A recess is formed on the side of the first wall facing the electrode assembly, and the recess is disposed opposite to the first portion along the thickness direction; At least a portion of the tab is accommodated within the recess, and at least a portion of the first connecting portion is accommodated within the recess.

11. The battery cell according to claim 10, characterized in that, The projection of the electrode terminal along the first direction at least partially overlaps with the projection of the tab along the first direction.

12. The battery cell according to claim 11, characterized in that, The second portion is located in the middle region of the first wall along the first direction.

13. The battery cell according to claim 7, characterized in that, The heat dissipation part includes a plurality of first ribs, which are spaced apart along a second direction, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

14. The battery cell according to claim 1, characterized in that, The main body is provided with a groove, the position of which corresponds to the position of the electrode terminal, and the groove is recessed on the side of the main body facing away from the electrode terminal. The portion of the main body corresponding to the groove is welded to the electrode terminal to form a solder mark, which is accommodated within the groove.

15. The battery cell according to claim 14, characterized in that, The dimension of the heat dissipation portion along the thickness direction of the first wall is greater than or equal to the dimension of the portion of the main body corresponding to the groove along the thickness direction.

16. The battery cell according to claim 1, characterized in that, The main body and the heat dissipation part are integrally formed.

17. The battery cell according to any one of claims 1-16, characterized in that, The outer casing includes an end cap and a housing, the housing having an opening, and the end cap closing onto the opening; The end cap is configured as the first wall.

18. A battery device, characterized in that, It includes multiple battery cells as described in any one of claims 1-17.

19. The battery device according to claim 18, characterized in that, The battery device further includes a heat exchange component, which is disposed outside the battery cell and opposite to the heat dissipation part.

20. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-17 or a battery device as described in claim 18 or 19, wherein the battery cell or the battery device is used to store or provide electrical energy.

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