Adapter of single battery, single battery, battery device, power utilization device and energy storage device

Abstract

The utility model discloses an adapter of a battery monomer, the battery monomer, a battery device, a power utilization device and an energy storage device. The adapter comprises a first connecting part and a second connecting part, wherein the first connecting part is used for being electrically connected with the electric connecting part of the battery monomer; the second connecting part is used for being electrically connected with a tab of the battery monomer; the first connecting part is connected with the second connecting part, the third connecting part is connected with the first connecting part and the second connecting part, at least part of the third connecting part is a thickened area, and the thickness of the thickened area is larger than that of the first connecting part and / or larger than that of the second connecting part. According to the technical scheme, the third connecting part is provided with the thickened area, so that the direct-current internal resistance of the thickened area is reduced, the heat yield is reduced, the temperature rise is effectively reduced, and the overcurrent capability is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery cell adapter, a battery cell, a battery device, an electrical device, and an energy storage device. Background Technology

[0002] In related technologies, the electrical connection of a battery cell is electrically connected to the tab via an adapter. The adapter has an overcurrent limiting point, which causes the overcurrent temperature to rise. Utility Model Content

[0003] This utility model provides a battery cell adapter, a battery cell, a battery device, an electrical device, and an energy storage device, which effectively reduces temperature rise and improves overcurrent capacity.

[0004] In a first aspect, this utility model provides an adapter for a battery cell, comprising: a first connecting portion for electrically connecting to an electrical connecting portion of the battery cell; a second connecting portion for electrically connecting to a tab of the battery cell; and a third connecting portion connecting the first connecting portion and the second connecting portion, wherein at least a portion of the third connecting portion is a thickened region, the thickness of the thickened region being greater than the thickness of the first connecting portion and / or greater than the thickness of the second connecting portion.

[0005] In the above technical solution, by setting a thickened area in the third connection part, the DC internal resistance of the thickened area is reduced, the heat generation is reduced, the temperature rise is effectively reduced, and the current carrying capacity is improved.

[0006] In some embodiments, the second connecting portion includes a first region connected to the tab and a second region not connected to the tab, the thickness of the second region is H1, the maximum thickness of the third connecting portion is H2, and H2-H1 is less than or equal to H1.

[0007] Among the above technical solutions, the adapter is more cost-effective and easier to manufacture.

[0008] In some embodiments, H1 / (H2-H1) is greater than or equal to 1 and less than or equal to 5.

[0009] In the above technical solution, the temperature rise of the adapter is further reduced while reducing costs and making it easier to mold.

[0010] In some embodiments, the second connection portion includes a first region connected to the tab and a second region not connected to the tab, the thickness of the second region is H1, the thickness of the first region is H3, and H1 / H3 is greater than or equal to 0.5 and less than or equal to 5.

[0011] The above technical solution not only improves the connection reliability between the second connecting part and the electrode, but also effectively reduces the internal resistance between the second connecting part and the electrode, reduces the heat generation at the connection, and makes the structure more compact.

[0012] In some embodiments, the first connecting portion, the second connecting portion, and the third connecting portion are integrally formed.

[0013] In the above technical solution, there is no need to thicken the third connecting part after the adapter is formed. The integrity of the thickened area and the integrity of the adapter are better, which helps to reduce internal resistance.

[0014] In some embodiments, the third connecting portion includes a connecting body and a thickened portion, wherein the first connecting portion, the second connecting portion and the connecting body are integrally formed, and the thickened portion is attached to at least one side of the connecting body in the thickness direction.

[0015] In the above technical solution, the thickening process is carried out by thickening the part, so that different models of adapter parts can meet different thickening requirements by replacing the thickening part with a different thickness. In addition, the setting position of the thickening part on the connecting body is more flexible and accurate, which is conducive to improving the accuracy of reducing temperature rise. The forming process of the first connecting part, the second connecting part and the connecting body is not affected by the thickening, which is conducive to reducing the forming difficulty.

[0016] In some embodiments, the third connecting portion is a bent structure and includes a first plate and a second plate connected together. The first plate is connected to the first connecting portion, and the second plate is connected to the second connecting portion. The thickness of at least one of the first plate and the second plate is greater than the thickness of the first connecting portion and / or greater than the thickness of the second connecting portion.

[0017] In the above technical solution, the third connecting part forms a bent structure, which can adapt to the positional arrangement of the electrical connecting part and the electrode, facilitating direct connection between the first connecting part and the electrical connecting part, and direct connection between the second connecting part and the electrode, thereby reducing the impedance at the electrical connection and reducing the temperature rise. Furthermore, at least one of the first plate and the second plate is formed as a thickened area, thereby thickening the bent area and preventing the formation of a thin current bottleneck, which further helps to reduce the temperature rise.

[0018] In some embodiments, the first connecting portion and the second connecting portion are located on adjacent sides of the electrode body of the battery cell, and at least a portion of the thickness of the second plate is greater than the thickness of the first plate.

[0019] In the above technical solution, the area of ​​the adapter near the second connection part is more prone to excessive temperature rise. By making at least part of the second plate thicker than the first plate, the thickness of at least part of the second plate is increased, which improves the effect of reducing internal resistance and temperature rise, thereby making the overall temperature rise of the adapter more balanced.

[0020] In some embodiments, the first connecting portion and the second connecting portion are located on the same side of the electrode body of the battery cell, and at least part of the thickness of the first plate is greater than the thickness of the second plate.

[0021] In the above technical solution, the area of ​​the adapter near the first connection part is more prone to excessive temperature rise. By making the thickness of at least part of the first plate greater than that of the second plate, the thickness of at least part of the first plate is increased, which improves the effect of reducing internal resistance and temperature rise, thereby making the overall temperature rise of the adapter more balanced.

[0022] In some embodiments, the first connecting portion and the second connecting portion are arranged along a first direction, the first plate extends along the first direction, the first direction is perpendicular to the thickness direction of the first plate, one end of the first plate is connected to the end of the first connecting portion away from the electrical connecting portion, the second connecting portion is located on the side of the first plate close to the electrical connecting portion, one end of the second plate is connected to the other end of the first plate, and one end of the second plate is inclined toward the other end and toward the electrical connecting portion, and the second connecting portion is connected to the other end of the second plate.

[0023] In the above technical solution, the second connecting part and the first connecting part can share space in the thickness direction of the first plate, thereby reducing the space occupied by the overall adapter between the electrode body and the electrical connecting part and improving the space utilization rate within the battery cell. When the first plate is thickened, the gap between it and the electrical connecting part can be fully utilized without easily affecting the space inside the casing, which is beneficial to reducing the space occupied.

[0024] In some embodiments, the angle between the second plate and the first plate is 150° to 160°.

[0025] The above technical solution further improves the reliability of the adapter and the compactness of the structure, which is more conducive to improving space utilization.

[0026] In some embodiments, the first connecting portion and the second connecting portion are arranged along a first direction, the third connecting portion extends along the first direction, the first direction is perpendicular to the thickness direction of the third connecting portion, and the thickness of the third connecting portion, at least a portion of which is close to the second connecting portion, decreases in the direction close to the second connecting portion.

[0027] In the above technical solution, the portion of the adapter located between the first connecting part and the second connecting part has a higher temperature rise in the area closer to the first connecting part than in the area closer to the second connecting part. By utilizing the thickness differences in different areas of the third connecting part, the temperature rise in different areas can be balanced; areas with higher temperature rises have a thicker thickness, while areas with lower temperature rises have a thinner thickness, resulting in a more balanced overall temperature rise and improved current-carrying capacity.

[0028] Secondly, this utility model embodiment also provides a battery cell, including an electrode assembly, an electrical connection portion, and an adapter for the battery cell, wherein the electrode assembly includes tabs, and the adapter electrically connects the tabs and the electrical connection portion.

[0029] Thirdly, this utility model embodiment also provides a battery device, including the aforementioned battery cell.

[0030] Fourthly, this utility model embodiment also provides an energy storage device, including the battery device described above, wherein the battery device is used to store or provide electrical energy.

[0031] Fifthly, this utility model embodiment also provides an electrical device, including the battery device or the energy storage device described above, wherein the battery device is used to store or provide electrical energy. Attached Figure Description

[0032] Figure 1 A schematic diagram of a vehicle provided for an embodiment of this utility model;

[0033] Figure 2 A schematic diagram of the battery device provided in an embodiment of this utility model;

[0034] Figure 3 An exploded view of a single battery cell provided in an embodiment of this utility model;

[0035] Figure 4 This is a partial structural schematic diagram of a battery cell provided in some embodiments of the present invention;

[0036] Figure 5 This is a partial structural schematic diagram of a battery cell provided in some other embodiments of the present invention;

[0037] Figure 6 A schematic diagram of an adapter provided in some embodiments of this utility model;

[0038] Figure 7 A schematic diagram of an adapter provided for other embodiments of the present invention;

[0039] Figure 8 for Figure 7 A cross-sectional view along the direction indicated by line AA;

[0040] Figure 9 A schematic diagram of an adapter provided for some embodiments of the present invention;

[0041] Figure 10 for Figure 9 A cross-sectional view along the direction indicated by line BB;

[0042] Figure 11 A schematic diagram of an energy storage device provided in an embodiment of this utility model.

[0043] Figure label:

[0044] Vehicle 1; Battery unit 1000; Controller 2000; Motor 3000; Energy storage unit 2;

[0045] Battery cell 100; casing 200; first casing 210; second casing 220;

[0046] Shell 10; Shell body 11; Cover 12;

[0047] Electrode assembly 20; tab 21; electrode body 22;

[0048] Electrical connection part 30;

[0049] Adapter 40; First connecting part 41; Second connecting part 42; First region 421; Second region 422; Third connecting part 43; Thickened region 431; Connecting body 432; Thickened part 433; First plate 434; Second plate 435;

[0050] First direction F1; Second direction F2; Third direction F3. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0052] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order or hierarchy.

[0053] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. 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 mutually exclusive with other embodiments.

[0054] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "attachment," 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 connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] In this invention, 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 invention, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In the embodiments of this utility model, 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 utility model shown in the 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 utility model.

[0057] In this utility model, "multiple" refers to two or more (including two).

[0058] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via electrical connectors.

[0059] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0060] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0061] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0062] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0063] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0064] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0065] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0066] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0067] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0068] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can be cylindrical, cuboid, or other shapes, and this application embodiment is not limited to this either.

[0069] A single battery cell includes a casing, electrode components, and an electrolyte (which may be a solid electrolyte layer located between the positive and negative electrodes in a solid-state battery). The electrode components include at least one electrode assembly, and both the electrode assembly and the electrolyte are housed within the casing. The electrode assembly includes a positive electrode, a negative electrode, and a separator (this structure can be omitted in solid-state batteries). The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes.

[0070] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0071] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc.

[0072] The separator can be made of PP, polypropylene, PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of this application has a wound or stacked structure.

[0073] The electrode assembly can be a wound structure or a stacked structure. During processing, the positive electrode sheet, negative electrode sheet, and separator are wound or stacked in sequence to obtain the electrode assembly. In the electrode assembly, multiple positive electrode tabs are stacked together and electrically connected to the positive electrode electrical connection part through a positive electrode adapter, and multiple negative electrode tabs are stacked together and electrically connected to the negative electrode electrical connection part through a negative electrode adapter.

[0074] This application provides an energy storage device including one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0075] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0076] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0077] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0078] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0079] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an Insulation Monitoring Module (IMM), a Master Battery Management Unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0080] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used for detection, alarm, or fire suppression.

[0081] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0082] In related technologies, the electrical connection of a battery cell is electrically connected to the tab via an adapter. The adapter has an overcurrent limiting point, which causes the overcurrent temperature to rise and approach the design safety boundary.

[0083] In view of this, embodiments of this application propose an adapter for a battery cell, including a first connecting portion, a second connecting portion, and a third connecting portion. The first connecting portion is used for electrical connection with an electrical connection portion of the battery cell, the second connecting portion is used for electrical connection with a tab of the battery cell, and the third connecting portion connects the first connecting portion and the second connecting portion. At least a portion of the third connecting portion is a thickened region, the thickness of which is greater than the thickness of the first connecting portion; or, the thickness of the thickened region is greater than the thickness of the second connecting portion; or, the thickness of the thickened region is greater than the thickness of both the first and second connecting portions.

[0084] In the adapter of the battery cell with the above structure, a thickened area is provided through the third connection part to reduce the DC internal resistance of the thickened area, reduce heat generation, effectively reduce temperature rise, and improve overcurrent capacity.

[0085] The technical solutions described in the embodiments of this application are applicable to battery cells using adapters, battery devices using battery cells, and electrical devices or energy storage devices using battery devices.

[0086] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0087] Energy storage devices can be energy storage containers or energy storage cabinets. They can be used in energy storage power stations, wind power systems, solar power 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, they can store energy during off-peak hours and provide power to relevant users or electrical devices during peak hours.

[0088] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0089] Please refer to Figure 1 , Figure 1The diagram below illustrates a vehicle 1 according to some embodiments of the present invention. The vehicle 1 is equipped with a battery device 1000, which may be located at the bottom, front, or rear of the vehicle 1. The battery device 1000 can be used to power the vehicle 1; for example, the battery device 1000 can serve as the operating power source for the vehicle 1.

[0090] The vehicle 1 may also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery device 1000 to supply power to the motor 3000, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0091] In some embodiments of this application, the battery device 1000 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.

[0092] Please refer to Figure 2 , Figure 2 The exploded view is of a battery device 1000 provided in some embodiments of this application. The battery device 1000 includes a battery cell assembly and a housing 200 for housing the battery cell assembly.

[0093] The battery cell assembly includes multiple battery cells 100. The multiple battery cells 100 can be stacked or arranged in an array. For example, see reference... Figure 2 Multiple battery cells 100 are stacked along the first direction F1 to form a battery cell assembly.

[0094] The housing 200 can have various structural forms. In some embodiments, the housing 200 may include a first housing 210 and a second housing 220, the first housing 210 and the second housing 220 overlapping each other, the first housing 210 and the second housing 220 together defining a receiving space for accommodating a battery cell assembly. For example, refer to... Figure 2 Both the first box 210 and the second box 220 are hollow structures with an opening on one side, and the opening sides of the first box 210 and the second box 220 overlap each other. The box 200 can be of various shapes, such as a cylindrical box, a cuboid box, etc.

[0095] Please refer to Figures 3-5 , Figure 3 An exploded view of the battery cell 100 provided in an embodiment of this utility model; Figure 4 This is a partial structural schematic diagram of a battery cell 100 provided in some embodiments of the present invention; Figure 5This is a partial structural schematic diagram of a battery cell 100 provided in some other embodiments of the present invention. The battery cell 100 includes a housing 10, an electrode assembly 20, two electrical connection portions 30 (positive electrode connection portion 30 and negative electrode connection portion 30), and two adapters 40 (positive electrode adapter 40 and negative electrode adapter 40). The housing 10 includes a housing body 11 and a cover 12. The cover 12 covers the housing body 11 to define a receiving cavity for accommodating the electrode assembly 20. The two electrical connection portions 30 are spaced apart along a second direction F2 on the cover 12. The electrode assembly 20 includes two tabs 21 (positive electrode tab 21 and negative electrode tab 21). The positive electrode adapter 40 connects the positive electrode tab 21 and the positive electrode connection portion 30, and the negative electrode adapter 40 connects the negative electrode tab 21 and the negative electrode connection portion 30.

[0096] Hereinafter, with reference to the accompanying drawings, a battery cell 100 and a battery cell 100 adapter 40 according to an embodiment of the present invention will be described.

[0097] Please refer to Figures 3-5 As shown, the battery cell 100 includes an electrode assembly 20, an electrical connection portion 30, and an adapter 40 for the battery cell 100 according to an embodiment of the present invention. The electrode assembly 20 includes a tab 21, and the adapter 40 electrically connects the tab 21 and the electrical connection portion 30.

[0098] Please refer to Figures 6-10 As shown, Figure 6 A schematic diagram of the adapter 40 provided in some embodiments of the present invention; Figure 7 A schematic diagram of the adapter 40 provided in other embodiments of the present invention; Figure 8 for Figure 7 A cross-sectional view along the direction indicated by line AA; Figure 9 A schematic diagram of the adapter 40 provided in some embodiments of the present invention; Figure 10 for Figure 9 A cross-sectional view along the direction shown by line BB. The adapter 40 of the battery cell 100 includes a first connecting portion 41, a second connecting portion 42, and a third connecting portion 43.

[0099] Specifically, the first connecting portion 41 is used for electrical connection with the electrical connecting portion 30 of the battery cell 100, the second connecting portion 42 is used for electrical connection with the tab 21 of the battery cell 100, and the third connecting portion 43 connects the first connecting portion 41 and the second connecting portion 42. At least a portion of the third connecting portion 43 is a thickened region 431, the thickness of which is greater than the thickness of the first connecting portion 41; or, the thickness of the thickened region 431 is greater than the thickness of the second connecting portion 42; or, the thickness of the thickened region 431 is greater than the thickness of both the first and second connecting portions 42.

[0100] The connection between the first connecting part 41 and the electrical connecting part 30 can be, but is not limited to, welding or abutting; the connection between the second connecting part 42 and the tab 21 can be, but is not limited to, welding or abutting. In some specific embodiments, the first connecting part 41 and the electrical connecting part 30 are laser-welded, and the second connecting part 42 and the tab 21 are ultrasonically welded. Laser welding has higher power and is more conducive to achieving a reliable electrical connection between the first connecting part 41 and the electrical connecting part 30, while ultrasonic welding is more conducive to achieving a larger area connection between the second connecting part 42 and the tab 21, thereby improving strength and reducing flow resistance.

[0101] The same adapter 40 may include one or more second connecting parts 42, wherein the multiple second connecting parts 42 may be electrically connected to multiple electrodes 21 respectively, or to different areas of the same electrode 21, all of which are within the protection scope of this utility model. For example, in some embodiments, such as Figure 3 As shown, the battery cell 100 includes multiple electrode assemblies 20, each electrode assembly 20 including a tab 21. The adapter 40 has multiple second connecting portions 42, which are electrically connected to the tabs 21 of the multiple electrode assemblies 20 respectively, to achieve parallel connection of the multiple electrode assemblies 20 and increase the capacity of the battery cell 100. For example, in some other embodiments, such as... Figure 4 As shown, the battery cell 100 includes an electrode assembly 20, and the adapter 40 has a plurality of second connection portions 42, which are electrically connected to different regions of the tabs 21 of the electrode assembly 20.

[0102] The battery cell 100 may include two adapters 40, wherein the first connecting part 41 of one adapter 40 is connected to the positive electrode electrical connecting part 30 and the second connecting part 42 is connected to the positive electrode tab 21, and the first connecting part 41 of the other adapter 40 is connected to the negative electrode electrical connecting part 30 and the second connecting part 42 is connected to the negative electrode tab 21.

[0103] The thickness of the first connecting portion 41 refers to the dimension of the first connecting portion 41 in the arrangement direction of the first connecting portion 41 and the connected electrical connecting portion 30. The thickness of the second connecting portion 42 refers to the dimension of the second connecting portion 42 in the arrangement direction of the second connecting portion 42 and the connected tab 21. The thickness of the third connecting portion 43 refers to the distance between the side surface of the third connecting portion 43 facing the tab 21 (i.e., the side surface facing away from the electrical connecting portion 30) and the side surface of the third connecting portion 43 facing away from the tab 21 (i.e., the side surface facing the electrical connecting portion 30).

[0104] For example, in some specific embodiments, such as Figure 6As shown, the third connecting portion 43 includes a first plate 434 and a second plate 435. The first plate 434 and the first connecting portion 41 are located on the same side of the electrode body 22 in the third direction F3 and are connected. The second plate 435 and a portion of the second connecting portion 42 are located on the same side of the electrode body 22 in the second direction F2 and are connected. The thickness of the first plate 434 is the dimension along the third direction F3, and the thickness of the second plate 435 is the dimension along the second direction F2. The second direction F2 and the third direction F3 are perpendicular.

[0105] For example, in some specific embodiments, such as Figures 7-10 As shown, the first connecting portion 41 and the second connecting portion 42 are arranged along the first direction F1. A portion of the third connecting portion 43 connects the first connecting portion 41 and the second connecting portion 42 along the first direction F1, while the other portion of the third connecting portion 43 is located on both sides of the first connecting portion 41 along the second direction F2 and directly connects between the two second connecting portions 42. The thickness of the third connecting portion 43, the thickness of the first connecting portion 41, and the thickness of the second connecting portion 42 are all dimensions along the third direction F3. The first direction F1, the second direction F2, and the third direction F3 are all perpendicular to each other.

[0106] Temperature rise simulation tests revealed that the third connection 43 between the first connection 41 and the second connection 42 in related technologies is prone to excessive overcurrent temperature rise, approaching the design safety boundary. Therefore, in the embodiments of this application, the thickened region 431 of the third connection 43 is thickened, so that the thickness of the thickened region 431 can be greater than the thickness of at least one of the first connection 41 and the second connection 42. In other words, at least part of the third connection 43 is thickened, so that the thickness of the adapter piece on the current transmission path between the first connection 41 and the second connection 42 is sufficiently thick, making it less likely to form a thin area or an area with excessive impedance, which helps to reduce heat generation and prevents problems such as high heat generation and excessive temperature rise.

[0107] According to the embodiment of the present invention, the adapter 40 of the battery cell 100 is provided with a thickened region 431 through the third connecting part 43, which reduces the DC internal resistance of the thickened region 431, reduces heat generation, effectively reduces temperature rise, and improves overcurrent capacity.

[0108] According to some embodiments of this utility model, such as Figures 6-9 As shown, the second connecting portion 42 includes a first region 421 connected to the tab 21 and a second region 422 not connected to the tab 21. The thickness of the second region 422 is H1, and the maximum thickness of the third connecting portion 43 is H2. H2-H1 is less than or equal to H1.

[0109] In other words, the thickness of the second region 422 is a standard thickness without any additional thickness, and the thickness of the third connecting portion 43 relative to the standard thickness is less than or equal to H1. Excessive thickness of the third connecting portion 43 would increase the cost of the adapter 40 and make it difficult to form; for example, the bending joint would be difficult to bend, or the connection between the thickened portion 433 and the connecting body 432 would be unreliable. Within the aforementioned range, the adapter 40 has a more reasonable cost and is easier to form.

[0110] In some embodiments, H1 / (H2-H1) is greater than or equal to 1 and less than or equal to 5, which further reduces the temperature rise of the adapter 40 while reducing costs and facilitating molding. For example, in some specific embodiments, H1 / (H2-H1) can be 1, 2, 3, 4, and 5, etc.

[0111] According to some embodiments of this utility model, such as Figures 6-9 As shown, the second connecting part 42 includes a first region 421 connected to the tab 21 and a second region 422 not connected to the tab 21. The thickness of the second region 422 is H1, and the thickness of the first region 421 is H3. The ratio of H1 to H3 is greater than or equal to 0.5 and less than or equal to 5.

[0112] If H1 / H3 is too large, the first region 421 will be too thin, resulting in an unreliable connection between the first region 421 and the tab 21, and the second connection 42 will be prone to breakage. If H1 / H3 is too small, the first region 421 will be too thick, further increasing the thickness after the first region 421 is connected to the tab 21, increasing the occupied space and the flow path length at the connection, leading to increased heat generation. Within the above value range, the reliability of the connection between the second connection 42 and the tab 21 is improved, the internal resistance between the second connection 42 and the tab 21 is effectively reduced, the heat generation at the connection is reduced, and the structure is made more compact. For example, in some specific embodiments, H1 / H3 can be 0.5, 0.8, 1.1, 2, 3, 4, and 5, etc.

[0113] In the embodiments of this application, the thickening of the thickened region 431 of the third connecting portion 43 can be achieved in various ways. For example, in some embodiments, the first connecting portion 41, the second connecting portion 42, and the third connecting portion 43 are integrally formed. In other words, the thickening of the thickened region 431 of the third connecting portion 43 is achieved by thickening the original sheet metal. For example, before the adapter 40 is formed by sheet metal processing or other processes, the thickness of the region corresponding to the thickened region 431 of the third connecting portion 43 is greater than the thickness of other regions. There is no need to thicken the third connecting portion 43 after the adapter 40 is formed, resulting in better integrity of the thickened region 431 and the adapter 40, which is beneficial for reducing internal resistance.

[0114] For example, in other embodiments, such as Figure 8 and Figure 10 As shown, the third connecting part 43 includes a connecting body 432 and a thickened part 433. The first connecting part 41, the second connecting part 42 and the connecting body 432 are integrally formed, and the thickened part 433 is attached to at least one side of the connecting body 432 in the thickness direction.

[0115] The thickened portion 433 and the connecting body 432 can be connected together by welding or other means. The thickened portion 433 can be provided on the entire surface of the connecting body 432 or on a part of the surface of the connecting body 432; the thickened portion 433 can be provided on one side surface of the connecting body 432 or on both sides surface of the connecting body 432.

[0116] By thickening the part 433, different models of adapter parts 40 can meet different thickening requirements by replacing the thickened part 433 with different thicknesses. Furthermore, the setting position of the thickened part 433 on the connecting body 432 is more flexible and accurate, which helps to improve the accuracy of reducing temperature rise. The molding process of the first connecting part 41, the second connecting part 42 and the connecting body 432 is not affected by the thickening, which helps to reduce the molding difficulty.

[0117] According to some embodiments of this utility model, such as Figures 6-8 As shown, the third connecting portion 43 is a bent structure, and the third connecting portion 43 includes a first plate 434 and a second plate 435 connected together. The first plate 434 is connected to the first connecting portion 41, and the second plate 435 is connected to the second connecting portion 42. The thickness of at least one of the first plate 434 and the second plate 435 is greater than the thickness of the first connecting portion 41 and / or greater than the thickness of the second connecting portion 42.

[0118] The third connecting part 43 is a bent structure, meaning that the first plate 434 and the second plate 435 extend in different directions, and the two plates form a certain angle, with the connection point of the first plate 434 and the second plate 435 forming a bend. The first plate 434 and the connected first connecting part 41 can extend in the same direction, or at least partially in different directions; the second plate 435 and the connected second connecting part 42 can extend in the same direction, or at least partially in different directions.

[0119] In the above embodiment, the third connecting part 43 forms a bent structure, which can adapt to the positional arrangement of the electrical connecting part 30 and the tab 21. For example, it can adapt to the difference in the distance between the electrical connecting part 30 and the tab 21 and the electrode body 22 in the third direction F3, or adapt to the positional difference of the electrical connecting part 30 and the tab 21 on different sides of the electrode body 22. This is beneficial for the first connecting part 41 to be directly connected to the electrical connecting part 30 and the second connecting part 42 to be directly connected to the tab 21, thereby reducing the impedance at the electrical connection and reducing the temperature rise.

[0120] Furthermore, bent structures are more prone to forming thinner areas, which can easily lead to excessively high overcurrent temperature rise. Therefore, at least one of the first plate 434 and the second plate 435 is thickened; in other words, at least one of the first plate 434 and the second plate 435 is formed as a thickened region 431, thereby thickening the bend and making it less likely to form a thin overcurrent bottleneck, which helps to reduce temperature rise.

[0121] In some embodiments, such as Figure 5 and Figure 6 As shown, the first connecting portion 41 and the second connecting portion 42 are located on adjacent sides of the electrode body 22 of the battery cell 100, and at least part of the thickness of the second plate 435 is greater than the thickness of the first plate 434. For example Figure 6 As shown, the first connecting part 41 is located on one side of the electrode body 22 in the third direction F3, the second connecting part 42 is located on one side of the electrode body 22 in the second direction F2, and the adapter 40 is generally formed into an L-shaped structure.

[0122] For the adapter 40 with the above structure, the area near the second connecting part 42 is more prone to excessive temperature rise. By making at least part of the second plate 435 thicker than the first plate 434, the thickness of at least part of the second plate 435 is increased, which reduces internal resistance and temperature rise, resulting in a more balanced temperature rise of the adapter 40 as a whole.

[0123] It is worth noting that in the above embodiments, the first plate 434 may include a thickened region 431 or may not include a thickened region 431. In the embodiment where the first plate 434 includes a thickened region 431, the thickness of the second plate 435 is greater than the thickness of the first plate 434.

[0124] In other embodiments, such as Figure 4 , Figures 7-10 As shown, the first connecting portion 41 and the second connecting portion 42 are located on the same side of the electrode body 22 of the battery cell 100, and at least part of the thickness of the first plate 434 is greater than the thickness of the second plate 435. For example Figure 7 As shown, the first connecting part 41 and the second connecting part 42 are both located on the same side of the electrode body 22 in the third direction F3, and the adapter 40 is generally formed as a plate-shaped structure.

[0125] For the adapter 40 with the above structure, the area near the first connecting part 41 is more prone to excessive temperature rise. By making at least part of the first plate 434 thicker than the second plate 435, the thickness of at least part of the first plate 434 is increased, which improves the effect of reducing internal resistance and temperature rise, thereby making the overall temperature rise of the adapter 40 more balanced.

[0126] It is worth noting that in the above embodiments, the second plate 435 may include a thickened region 431 or may not include a thickened region 431. In the embodiment where the second plate 435 includes a thickened region 431, the thickness of the first plate 434 is greater than the thickness of the second plate 435.

[0127] In some embodiments where the first connecting portion 41 and the second connecting portion 42 are located on the same side of the electrode body 22, such as Figure 7 and Figure 8 As shown, the first connecting portion 41 and the second connecting portion 42 are arranged along the first direction F1, and the first plate 434 extends along the first direction F1, which is perpendicular to the thickness direction of the first plate 434. One end of the first plate 434 is connected to the end of the first connecting portion 41 away from the electrical connecting portion 30. The second connecting portion 42 is located on the side of the first plate 434 closer to the electrical connecting portion 30. One end of the second plate 435 is connected to the other end of the first plate 434, and one end of the second plate 435 is inclined towards the other end and towards the electrical connecting portion 30. The second connecting portion 42 is connected to the other end of the second plate 435.

[0128] The end of the first connecting part 41 near the electrical connecting part 30 can be used to make an electrical connection with the electrical connecting part 30. The first plate 434 is connected to the end of the first connecting part 41 away from the electrical connecting part 30, so that the first plate 434 and the electrical connecting part 30 can be spaced a certain distance apart. Thus, when the first plate 434 is thickened, the gap between it and the electrical connecting part 30 can be fully utilized without affecting the space inside the housing 10, which is beneficial to reducing the space occupied.

[0129] One end of the second plate 435 is connected to the first plate 434 and the other end is connected to the second connecting part 42. From one end to the other, the second plate 435 is inclined towards the electrical connecting part 30. That is, in the thickness direction of the first plate 434, the distance between the second plate 435 and the electrical connecting part 30 decreases from one end to the other, so that the second plate 435 can adapt to the positional difference between the second connecting part 42 and the first plate 434 in the thickness direction of the first plate 434, and realize the connection between the two.

[0130] The second connecting part 42 is located on the side of the first plate 434 near the electrical connecting part 30, so that the second connecting part 42 and the first connecting part 41 can intersect in the thickness direction of the first plate 434, thereby reducing the space occupied by the adapter 40 in the thickness direction of the first plate 434, that is, reducing the space occupied by the adapter 40 in the gap between the electrode body 22 and the electrical connecting part 30, thereby improving the space utilization rate within the battery cell 100 and improving the performance of the battery cell 100.

[0131] For example, in such Figure 8In the specific example shown, the upper end face of the first connecting part 41 is connected to the electrical connecting part 30, and the lower end is connected to the connecting body 432 of the first plate 434. The upper end face of the second connecting part 42 is coplanar with the upper end face of the first connecting part 41, and the lower end face is connected to the electrode tab 21. The second plate 435 is inclined from right to left and upward, so that the second plate 435 connects the first plate 434 and the second connecting part 42. A certain recessed space is formed on the upper side of the connecting body 432 of the first plate 434. The reinforcing part of the first plate 434 is disposed in the recessed space and connected to the connecting body 432. In the above embodiment, the second connecting part 42 and the first connecting part 41 share a space in the vertical direction, and the reinforcing part occupies the recessed space, so that the overall space occupied by the adapter 40 in the vertical direction is small, which is beneficial to increasing the space available for arranging the electrode body 22 in the housing 10 and improving the space utilization rate.

[0132] In some embodiments, such as Figure 8 As shown, the angle between the second plate 435 and the first plate 434 is greater than or equal to 90°, i.e., 90°≤α<180°. If the angle between the first plate 434 and the second plate 435 is too small, the bending points at both ends of the second plate 435 are prone to breakage, resulting in poor reliability. Within the above-mentioned value range, the adapter 40 is easier to form as a whole, and the structural reliability is higher.

[0133] In some embodiments, the angle between the second plate 435 and the first plate 434 is 150°~160°, that is, 150°≤α≤160°.

[0134] The angle between the second plate 435 and the first plate 434 is too large, resulting in a weak effect in reducing the space occupied. Within the above-mentioned range, the reliability of the adapter 40 is further improved, and the structural compactness is further improved, which is more conducive to improving space utilization.

[0135] In some specific embodiments, the included angle between the second plate 435 and the first plate 434 can be 150°, 152°, 154°, 156°, 158° and 160°, etc.

[0136] In some embodiments of this utility model, such as Figure 9 and Figure 10 As shown, the first connecting portion 41 and the second connecting portion 42 are arranged along the first direction F1, and the third connecting portion 43 extends along the first direction F1. The first direction F1 is perpendicular to the thickness direction of the third connecting portion 43, and the thickness of the third connecting portion 43, at least a portion close to the second connecting portion 42, decreases in the direction close to the second connecting portion 42. For example, the first direction F1 can be the length direction of the battery cell 100, and the thickness direction of the third connecting portion 43 can be the height direction of the battery cell 100.

[0137] The third connecting part 43 can be as follows Figure 10 The thickness of a portion of the third connecting portion 43 near the second connecting portion 42 decreases in the direction of proximity to the second connecting portion 42, and the thickness of the other portion of the third connecting portion 43 away from the second connecting portion 42 is equal everywhere; or the overall thickness of the third connecting portion 43 decreases in the direction of proximity to the second connecting portion 42.

[0138] The third connecting portion 43 extends along the first direction F1, making it generally plate-shaped. For the adapter 40 with the above structure, the portion located between the first connecting portion 41 and the second connecting portion 42 has a higher temperature rise near the first connecting portion 41 than near the second connecting portion 42. By varying the thickness of different regions of the third connecting portion 43, the temperature rise in different regions can be balanced; regions with higher temperature rises have thicker thicknesses, and regions with lower temperature rises have thinner thicknesses, resulting in a more balanced overall temperature rise and improved current-carrying capacity.

[0139] like Figure 2 As shown, the battery device 1000 according to a third aspect embodiment of the present invention includes a battery cell 100 according to the second aspect embodiment of the present invention described above. Therefore, by providing a thickened region 431 through the third connection portion 43, the DC internal resistance of the thickened region 431 is reduced, heat generation is reduced, temperature rise is effectively reduced, and current carrying capacity is improved.

[0140] like Figure 11 As shown, the energy storage device 2 according to the fourth aspect embodiment of the present invention includes the battery device 1000 according to the third aspect embodiment of the present invention described above. The battery device 1000 is used to store or provide electrical energy. Therefore, by providing a thickened region 431 through the third connection portion 43, the DC internal resistance of the thickened region 431 is reduced, heat generation is reduced, temperature rise is effectively reduced, and current carrying capacity is improved.

[0141] like Figure 1 As shown, the electrical device according to the fifth aspect embodiment of the present invention includes a battery device 1000 according to the third aspect embodiment of the present invention or an energy storage device 2 according to the fourth aspect embodiment of the present invention. The battery device 1000 is used to store or provide electrical energy. Therefore, by providing a thickened region 431 through the third connection portion 43, the DC internal resistance of the thickened region 431 is reduced, heat generation is reduced, temperature rise is effectively reduced, and current carrying capacity is improved.

[0142] The following describes, with reference to the accompanying drawings, some specific embodiments of the battery device 1000 and the vehicle 1 having therein, according to the present invention.

[0143] like Figure 1 and Figure 2As shown, vehicle 1 includes a battery device 1000. According to some embodiments of the present invention, the battery device 1000 includes a housing 200 and a battery cell assembly disposed within the housing 200. The battery cell assembly includes a plurality of battery cells 100 stacked along the thickness direction.

[0144] like Figure 5 As shown, the battery cell 100 includes a housing 10 and an electrode assembly 20 disposed within the housing 10. The housing 10 includes a housing body 11 and a cover 12 covering the housing body 11. The cover 12 is provided with a positive electrode electrical connection portion 30 and a negative electrode electrical connection portion 30. The electrode assembly 20 includes a positive electrode tab 21 and a negative electrode tab 21. The positive electrode tab 21 is electrically connected to the positive electrode electrical connection portion 30 through a positive electrode adapter 40, and the negative electrode tab 21 is electrically connected to the negative electrode electrical connection portion 30 through a negative electrode adapter 40.

[0145] Taking the positive electrode adapter 40 as an example, such as Figure 6 As shown, the adapter 40 includes a first connecting part 41, two second connecting parts 42 and a third connecting part 43. The first connecting part 41 is welded to the electrical connecting part 30 by laser welding, and the second connecting parts 42 are welded to the tab 21 by ultrasonic welding.

[0146] The first connecting portion 41 is a flat plate with its thickness direction parallel to the third direction F3 and is located on one side of the electrode body 22 along the third direction F3. The second connecting portion 42 is located on one side of the electrode body 22 along the second direction F2 and includes a first region 421 and a second region 422. The second region 422 is a flat plate with its thickness direction parallel to the second direction F2. The first region 421 is a flat plate with its thickness direction parallel to the first direction F1 and is connected to the edge of the second region 422 on one side of the first direction F1. The third connecting part 43 includes a connecting body 432 and a reinforcing part. The connecting body 432 is a bent structure and includes a first plate 434 and a third plate. The thickness direction of the first plate 434 is parallel to the third direction F3 and is connected to the first connecting part 41. The thickness direction of the third plate is parallel to the second direction F2 and is connected to the second region 422. The reinforcing part is welded to the side of the third plate facing away from the electrode body 22 in the thickness direction, so that the reinforcing part and the third plate form a second plate 435. The second plate 435 is formed as a thickened region 431 of the third connecting part 43.

[0147] In the above embodiment, the thickened portion 433 thickens the third plate, which not only achieves local thickening of the area with higher temperature rise, but also thickens the bending area, which helps to reduce internal resistance, reduce overcurrent temperature rise, and improve overcurrent capacity.

[0148] Figure 7 and Figure 8 The illustrated embodiments and Figure 6The difference in the illustrated embodiment is that the first connecting portion 41 and the second connecting portion 42 are both located on the same side of the electrode body 22 in the third direction F3. The connecting body 432 of the third connecting portion 43 includes a fourth plate and a second plate 435. The thickness direction of the fourth plate is parallel to the third direction F3. The second plate 435 connects the fourth plate and the second connecting portion 42, and the second plate 435 is inclined away from the fourth plate along the first direction F1 and closer to the electrical connecting portion 30 along the third direction F3. The thickened portion 433 of the third connecting portion 43 is provided on the side of the fourth plate in the third direction F3 close to the electrical connecting portion 30, so that the thickened portion 433 and the fourth plate constitute the first plate 434. It is worth noting that a portion of the thickened portion 433 is located on both sides of the first connecting portion 41 in the first direction F1, and another portion is located on the side of the first connecting portion 41 in the second direction F2 close to the tab 21.

[0149] In the above embodiment, the thickening part 433 thickens the fourth plate, which not only realizes the local thickening of the area with high temperature rise, reduces the overcurrent temperature rise, and improves the overcurrent capacity, but also allows the first connecting part 41 and the second connecting part 42 to share space on the third direction F3. The thickening part 433 utilizes the space on the side of the fourth plate away from the electrode body 22, thereby improving the space utilization rate.

[0150] Figure 9 and Figure 10 The illustrated embodiments and Figure 7 The difference in the illustrated embodiment is that the surface of the first connecting portion 41 facing away from the electrical connecting portion 30, the surface of the second connecting portion 42 facing the tab 21, and the surface of the third connecting portion 43 facing the tab 21 are coplanar. The connecting body 432 of the third connecting portion 43 is flat, and a thickened portion 433 is provided on the side of the connecting body 432 facing away from the tab 21. The thickened portion 433 includes a first part and a second part. The first part is close to the first connecting portion 41 and has a uniform thickness everywhere. The second part is close to the second connecting portion 42 and its thickness decreases in the direction close to the second connecting portion 42.

[0151] In the above embodiment, the thickened portion 433 is thickened for areas of the connecting body 432 with different temperature rise conditions, and the thickness of the thickening portion is different, so as to make the temperature rise of different areas of the third connecting portion 43 uniform, thereby improving the overall temperature rise uniformity of the adapter 40 and improving the current carrying capacity.

[0152] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0153] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An adapter for a single battery cell, characterized in that, include: A first connecting portion is used for electrical connection with the electrical connection portion of the battery cell; The second connecting part is used for electrical connection with the tab of the battery cell; A third connecting portion connects the first connecting portion and the second connecting portion, wherein at least a portion of the third connecting portion is a thickened region, the thickness of which is greater than the thickness of the first connecting portion and / or greater than the thickness of the second connecting portion.

2. The adapter for a single battery cell as described in claim 1, characterized in that, The second connecting portion includes a first region connected to the tab and a second region not connected to the tab. The thickness of the second region is H1, and the maximum thickness of the third connecting portion is H2, where H2-H1 is less than or equal to H1.

3. The adapter for a single battery cell as described in claim 2, characterized in that, H1 / (H2-H1) is greater than or equal to 1 and less than or equal to 5.

4. The adapter for a single battery cell as described in claim 1, characterized in that, The second connecting portion includes a first region connected to the tab and a second region not connected to the tab. The thickness of the second region is H1, and the thickness of the first region is H3. The ratio of H1 to H3 is greater than or equal to 0.5 and less than or equal to 5.

5. The adapter for a single battery cell as described in claim 1, characterized in that, The first connecting part, the second connecting part, and the third connecting part are integrally formed.

6. The adapter for a single battery cell as described in claim 1, characterized in that, The third connecting part includes a connecting body and a thickened part. The first connecting part, the second connecting part and the connecting body are integrally formed, and the thickened part is attached to at least one side of the connecting body in the thickness direction.

7. The adapter for a single battery cell as described in claim 1, characterized in that, The third connecting part is a bent structure and includes a first plate and a second plate connected together. The first plate is connected to the first connecting part, and the second plate is connected to the second connecting part. The thickness of at least one of the first plate and the second plate is greater than the thickness of the first connecting part and / or greater than the thickness of the second connecting part.

8. The adapter for a single battery cell as described in claim 7, characterized in that, The first connecting portion and the second connecting portion are located on adjacent sides of the electrode body of the battery cell, and at least part of the thickness of the second plate is greater than the thickness of the first plate.

9. The adapter for a single battery cell as described in claim 7, characterized in that, The first connecting portion and the second connecting portion are located on the same side of the electrode body of the battery cell, and at least part of the thickness of the first plate is greater than the thickness of the second plate.

10. The adapter for a battery cell as described in claim 9, characterized in that, The first connecting portion and the second connecting portion are arranged along a first direction, and the first plate extends along the first direction, which is perpendicular to the thickness direction of the first plate. One end of the first plate is connected to the end of the first connecting portion away from the electrical connecting portion. The second connecting portion is located on the side of the first plate close to the electrical connecting portion. One end of the second plate is connected to the other end of the first plate, and one end of the second plate is inclined toward the other end and toward the electrical connecting portion. The second connecting portion is connected to the other end of the second plate.

11. The adapter for a single battery cell as described in claim 10, characterized in that, The angle between the second plate and the first plate is 150° to 160°.

12. The adapter for a single battery cell as described in claim 1, characterized in that, The first connecting portion and the second connecting portion are arranged along a first direction, and the third connecting portion extends along the first direction, the first direction being perpendicular to the thickness direction of the third connecting portion, and the thickness of the third connecting portion, at least a portion of which is close to the second connecting portion, decreases in the direction close to the second connecting portion.

13. A single battery cell, characterized in that, The device includes an electrode assembly, an electrical connection portion, and an adapter for a battery cell as described in any one of claims 1-12, wherein the electrode assembly includes tabs, and the adapter electrically connects the tabs and the electrical connection portion.

14. A battery device, characterized in that, Includes the battery cell as described in claim 13.

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

16. An electrical appliance, characterized in that, Includes the battery device as described in claim 14 or the energy storage device as described in claim 15, wherein the battery device is used to store or provide electrical energy.

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