Battery monomer, battery device, electric equipment and energy storage device

Abstract

The utility model provides a battery monomer, a battery device, electric equipment and an energy storage device, and belongs to the field of batteries. The battery monomer comprises an electrode part and an adapter part, wherein the electrode part comprises two electrode assemblies which are stacked along a first direction; the switching component is used for electrically connecting the electrode terminal with the tab, the switching component comprises a first connecting part, two second connecting parts and two bending parts, the two second connecting parts are located on the two sides of the first connecting part in the first direction respectively, the second connecting parts are connected with the first connecting part through the bending parts, the first connecting part is connected with the electrode terminal, and the second connecting part is connected with the tab. The two second connecting parts are in one-to-one correspondence with the tabs of the two electrode assemblies and are connected with the tabs; the adapter component further comprises a reinforcing part, the reinforcing part is connected with the bending part, and the reinforcing part can resist deformation of the bending part, so that the deformation degree of the bending part is reduced. Therefore, the risk of abnormal discharge or short circuit in the single battery caused by the deformation of the switching component can be reduced.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are crucial for sustainable social development. Batteries, with their ability to store or release energy as needed, are widely used in various electrical devices and energy storage systems, and are an important component in promoting energy transition and sustainable development. For the new energy industry, battery technology is a critical factor in its development.

[0003] Each battery cell contains an adapter component that connects the tabs and electrode terminals, providing electrical conductivity. However, in practical applications, this adapter component is prone to severe deformation, which can lead to abnormal discharge or short circuits within the battery cell. Utility Model Content

[0004] This application aims to at least address one of the technical problems existing in the background art. Therefore, one objective of this application is to provide a battery cell, battery device, electrical equipment, and energy storage device to reduce the risk of abnormal internal discharge or short circuit in the battery cell due to deformation of the adapter components.

[0005] An embodiment of the first aspect of this application provides a battery cell, including: a housing, an end cap, an electrode portion, and an adapter component. The housing has an opening, the end cap closes to the opening, and the end cap includes electrode terminals. The electrode portion is housed in the housing and includes two electrode assemblies stacked along a first direction, each electrode assembly having tabs. The adapter component is used to electrically connect the electrode terminals to the tabs. The adapter component includes a first connecting portion, two second connecting portions, and two bending portions. The two second connecting portions are respectively located on both sides of the first connecting portion along the first direction. The second connecting portions are connected to the first connecting portion via the bending portions. The first connecting portion is connected to the electrode terminals, and the two second connecting portions correspond one-to-one with and are connected to the tabs of the two electrode assemblies. The adapter component also includes a reinforcing portion connected to the bending portions, the reinforcing portion being configured to resist deformation of the bending portions.

[0006] In the technical solution of this application embodiment, the adapter component is designed to include two reinforcing parts that correspond one-to-one with the two bending parts, and each reinforcing part can be used to resist the deformation of the corresponding bending part, so that the bending part can withstand the deformation force and maintain stability. That is, the deformation amplitude of the bending part when subjected to the deformation force is reduced or even maintained in its original shape, thereby reducing the degree of deformation of the adapter component, thereby improving the problems caused by the deformation of the adapter component to the battery cell (such as abnormal internal discharge or short circuit).

[0007] In some embodiments, the reinforcing portion includes a first protrusion that is connected to a bend and protrudes toward another bend, and the first protrusion abuts against the surfaces of the first connecting portion toward the two second connecting portions.

[0008] In some embodiments, the reinforcing portion includes a second protrusion that is connected to a bend and protrudes in a direction away from another bend. The second protrusion is located on the side of a second connecting portion facing the first connecting portion and abuts against the second connecting portion.

[0009] In some embodiments, the reinforcing portion includes a third protrusion and a stop portion. The stop portion is fixedly disposed on the first connecting portion and protrudes toward two second connecting portions relative to the first connecting portion. The third protrusion is connected to a corresponding bend portion and protrudes toward another bend portion. The stop portion is used to restrict the third protrusion from moving in a first direction away from the other second connecting portion.

[0010] In some embodiments, the third protrusion abuts against the surface of the first connecting portion facing the two second connecting portions.

[0011] In some embodiments, the third protrusion is configured to be fitted around the outer periphery of the stop portion.

[0012] In some embodiments, the third protrusion includes a first connecting portion, a bent portion, and a second connecting portion connected in sequence. The first connecting portion is connected to a bent portion. The first connecting portion and the second connecting portion are located on both sides of the stop portion along the second direction. The first direction and the second direction are perpendicular to the gravity direction of the battery cell.

[0013] In some embodiments, the third protrusion is formed by multiple bends.

[0014] In some embodiments, the reinforcing portion includes a fourth protrusion, which is fixedly connected to the first connecting portion and abuts against the surface of one bending portion facing away from the other bending portion.

[0015] In some embodiments, the adapter is a one-piece molded part.

[0016] In some embodiments, the bending portion has a first end and a second end, the first end being connected to a first connecting portion and the second end being connected to a second connecting portion; from the first end to the second end, the bending portion extends toward the end cap.

[0017] An embodiment of the second aspect of this application provides a battery device that includes the battery cell described in the above embodiments.

[0018] An embodiment of the third aspect of this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0019] An embodiment of the fourth aspect of this application provides an energy storage device, which includes the battery device in the above embodiments, the battery device being capable of storing electrical energy.

[0020] 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

[0021] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0022] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0023] Figure 2 This is an exploded view of the battery device according to some embodiments of this application;

[0024] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application;

[0025] Figure 4 This is a schematic diagram of the structure of the adapter component in some embodiments of this application;

[0026] Figure 5 This is a partial cross-sectional schematic diagram of a battery cell according to some embodiments of this application;

[0027] Figure 6 This is a simplified force diagram of the adapter component in some embodiments of this application;

[0028] Figure 7 This is a schematic diagram showing the connection between the adapter and two electrode assemblies in some embodiments of this application;

[0029] Figure 8 This is a schematic diagram of the adapter component before its fabrication, according to some embodiments of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1000 vehicles;

[0032] Battery unit 100, controller 200, motor 300;

[0033] Battery cell assembly 10, battery cell 11, housing 110, electrode assembly 120, tab 121, positive tab 121a, negative tab 121b, main body 122, end cap 130, electrode terminal 131, positive electrode terminal 131a, negative electrode terminal 131b, adapter 140, first connecting part 141, second connecting part 142, bending part 143, reinforcing part 144, first protrusion 1441, second protrusion 1442, third protrusion 1443, first connecting part 1443a, bending part 1443b, second connecting part 1443c, stop part 1444;

[0034] Box 20, first box 21, second box 22;

[0035] Flat plate component 30, flat plate body 31, first part 311, second part 312, third part 313, first protrusion 32, second protrusion 33, third protrusion 34, fourth protrusion 35. Detailed Implementation

[0036] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0038] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0039] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0041] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0042] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0043] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "linking", and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components.

[0044] In this application, the term "parallel" includes not only absolute parallelism but also approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only absolute perpendicularity but also approximate perpendicularity as commonly understood in engineering. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0045] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" may mean that other components not listed may also be included, or that only the listed components may be included. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0046] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0047] With the continuous improvement of the driving range of new energy vehicles and the increasing power of electronic devices, higher and higher requirements are being placed on the energy density and capacity of battery cells. Therefore, it is desirable to have as much space as possible inside the battery cell to accommodate the active materials. Consequently, the space reserved for the installation of the adapter within the battery cell is small, resulting in a smaller dimension of the adapter along the height of the battery cell, making the adapter prone to deformation. The bending points of the adapter are the weakest parts and are more susceptible to deformation.

[0048] For example, adapter components are typically connected to the tabs using ultrasonic welding technology. During the welding process, high-energy ultrasonic waves are transmitted to the adapter component, causing it to deform due to repeated stress at its bending points under high-frequency vibration. Similarly, the long-term exposure to bumps and vibrations during battery cell transportation can also lead to repeated stress and deformation at the bending points of the adapter component.

[0049] When the adapter component deforms, the bending angle at the bend changes, which in turn causes the position of the tab connection connected to the bend to shift, potentially squeezing the tab connected to the tab connection and causing the tab to rub against the electrode, resulting in a short circuit. Alternatively, localized fatigue damage at the bend can cause chipping, leading to abnormal discharge inside the battery cell or the falling metal debris piercing the separator and causing a short circuit.

[0050] In view of this, a battery cell has been designed in which the adapter component also includes a reinforcing section, each reinforcing section corresponding to and connected to a bending section, and the reinforcing section is provided to resist deformation of the bending section. In such a battery cell, thanks to the reinforcing section's ability to resist deformation, the occurrence of bending section deformation can be suppressed or mitigated, thereby reducing the risk of abnormal discharge or short circuit inside the battery cell due to deformation of the adapter component.

[0051] The battery devices described in this application can be used, but are not limited to, in electrical equipment or energy storage devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and battery devices described in this application can be used to construct such electrical equipment or energy storage devices.

[0052] The energy storage device utilizing a battery as a power system in this application embodiment can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output it at appropriate times. For example, the energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage device provided in this application embodiment can be used in any power system that requires energy storage.

[0053] In some embodiments, the energy storage device is an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0054] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet. Each battery cluster may include multiple battery units connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, these clusters are connected in parallel to increase the capacity of the energy storage device.

[0055] In this application embodiment, the electrical devices using battery devices as power sources can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0056] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0057] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0058] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0059] Figure 2 A schematic diagram of the structure of a battery device 100 according to an embodiment of this application is shown. Figure 2 As shown, the battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 may include multiple battery cells 11, which are connected in series, parallel, or mixed connection via a busbar.

[0060] In some embodiments, the battery cell assembly 10 is typically formed by arranging a plurality of battery cells 11.

[0061] As an example, the battery cell assembly 10 can be a battery module, which is formed by arranging and fixing multiple battery cells 11 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 11 together with cable ties.

[0062] In some embodiments, such as Figure 2 As shown, the battery device 100 can be a battery pack, which includes a housing 20 and one or more individual battery cells 10, with the individual battery cells 10 housed within the housing 20. The housing 20 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of combinations of simple cuboids, cylinders, or spheres. The material of the housing 20 can be an alloy such as aluminum alloy or iron alloy, a polymer such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0063] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be housed in the housing 20 by fixing the battery module in the housing 20.

[0064] As an example, the battery cell assembly 10 can also be housed in the housing 20 by directly fixing multiple battery cells 11 to the housing 20.

[0065] As an example, the housing 20 may include a first housing 21 and a second housing 22. The first housing 21 and the second housing 22 are fastened together to form a closed space inside the housing 20 to house the battery cell assembly 10. Here, "closed" refers to covering or closing, and can be either non-sealed or sealed to prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 11. The first housing 21 may be a top cover or a bottom plate.

[0066] As an example, the housing 20 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 20 forms an enclosed space to house the battery cell assembly 10.

[0067] In some embodiments, the housing 20 may be part of the vehicle's chassis structure. For example, a portion of the housing 20 may be at least a portion of the vehicle's floor, or a portion of the housing 20 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0068] The battery cell 11 provided in the embodiments of this application can be a secondary battery. A secondary battery refers to a battery cell 11 that can be used again after being discharged by recharging to activate the active material.

[0069] The battery cell 11 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. As an example, the battery cell 11 can be a prismatic battery cell, which includes prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells, etc., and this application has no particular limitation.

[0070] Please see Figures 3 to 5This application provides a battery cell 11, including: a housing 110, an end cap 130, an electrode portion, and an adapter 140. The housing 110 has an opening, and the end cap 130 covers the opening. The end cap 130 includes an electrode terminal 131. The electrode portion is housed in the housing 110 and includes two electrode assemblies 120 stacked along a first direction. Each electrode assembly 120 has a tab 121. The adapter 140 is used to electrically connect the electrode terminal 131 and the tab 121. The adapter 140 includes a first connecting portion 141, two second connecting portions 142, and two bending portions 143. The two second connecting portions 142 are located on both sides of the first connecting portion 141 along the first direction. The second connecting portions 142 are connected to the first connecting portion 141 through the bending portions 143. The first connecting portion 141 is connected to the electrode terminal 131. The two second connecting portions 142 correspond one-to-one with and are connected to the tabs of the two electrode assemblies 120. The adapter 140 also includes a reinforcing part 144, which is connected to the bending part 143 and is configured to resist deformation of the bending part 143.

[0071] The housing 110 is a component used to cooperate with the end cap 130 to form the internal environment of the battery cell 11, wherein the formed internal environment can accommodate the electrode assembly 120, electrolyte, and other components. The housing 110 and the end cap 130 can be independent components. The housing 110 has an opening, and the end cap 130 closes the opening to form the internal environment of the battery cell 11. Alternatively, the end cap 130 and the housing 110 can be integrated. Specifically, the end cap 130 and the housing 110 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 110, the end cap 130 closes the housing 110. The housing 110 can be of various shapes and sizes, such as cuboid, hexagonal prism, etc. Specifically, the shape of the housing 110 can be determined according to the specific shape and size of the electrode assembly 120. The material of the housing 110 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this.

[0072] End cap 130 refers to a component that covers the opening of housing 110 to isolate the internal environment of battery cell 11 from the external environment. The shape of end cap 130 can be adapted to the shape of housing 110 to fit it. Optionally, end cap 130 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 130 is not easily deformed under pressure or impact, allowing battery cell 11 to have higher structural strength. Electrode terminals 131 are used to output or input electrical energy into battery cell 11. Electrode terminals 131 include positive electrode terminal 131a and negative electrode terminal 131b, which can be sequentially spaced along a first direction or sequentially spaced along a second direction, the first direction and the second direction being perpendicular to the direction of gravity of battery cell 11. The first direction can be referred to as the thickness direction Y of the electrode assembly 120. The gravity direction can refer to the direction of gravity when the battery cell 11 is installed in the battery device. For example, the gravity direction can be referred to as the axial direction Z of the electrode assembly 120. For example, the second direction can be referred to as the length direction X of the electrode assembly 120.

[0073] The housing 110 may contain one or more electrode portions. The electrode assembly 120 is the component in the battery cell 11 where the electrochemical reaction occurs. The electrode assembly 120 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked. In some embodiments, the electrode assembly 120 can be flat or polygonal in shape. The electrode assembly 120 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets with active material constitute the main body 122 of the electrode assembly 120, the portions of the positive electrode sheet without active material constitute the positive tab 121a, and the portions of the negative electrode sheet without active material constitute the negative tab 121b. The positive tab 121a and the negative tab 121b constitute the tab 121, and the electrode assembly 120 can be used to conduct current from the electrode assembly 120. Each electrode assembly 120 includes at least one positive electrode tab 121a and at least one negative electrode tab 121b, which may be located at the same end of the main body 122 or at different ends of the main body 122.

[0074] The included angles between the bent portion 143 and the first connecting portion 141, and between the bent portion 143 and the second connecting portion 142, are not limited and can be right angles, acute angles, or obtuse angles. For example, the two bent portions 143 can be symmetrically arranged on both sides of the first connecting portion 141, and the two second connecting portions 142 can also be symmetrically arranged on both sides of the first connecting portion 141. Along the direction of gravity of the battery cell 11, the first connecting portion 141 and the second connecting portion 142 can be parallel to each other, in which case the first connecting portion 141 and the second connecting portion 142 have a height difference along the direction of gravity of the battery cell 11.

[0075] Specifically, the adapter 140 includes two reinforcing portions 144, which correspond one-to-one with and are connected to two bending portions 143. Each reinforcing portion 144 can resist the deformation of its corresponding bending portion 143. The ability of the reinforcing portion 144 to resist the deformation of the bending portion 143 means that when a deformation force is applied to the adapter 140 causing the bending portion 143 to tend to deform, the reinforcing portion 144 can counteract the deformation force (i.e., generate an internal reaction force to counteract the deformation force), thereby reducing or suppressing the deformation of the bending portion 143. Here, the deformation of the bending portion 143 can refer to bending or shearing, and the deformation force refers to the external force acting on the adapter 140 that changes the shape or size of the adapter 140.

[0076] Multiple adapter components 140 are provided, and the specific number of adapter components 140 can be designed according to requirements. For example, please refer to... Figure 3 and Figure 5 The adapter component 140 has two parts. The positive tabs 121a of the two electrode assemblies 120 of the electrode section are respectively connected to the two second connecting portions 142 of one adapter component 140, and the first connecting portion 141 of one adapter component 140 is connected to the positive electrode terminal 131a. The negative tabs 121b of the two electrode assemblies 120 of the electrode section are respectively connected to the two second connecting portions 142 of the other adapter component 140, and the first connecting portion 141 of the other adapter component 140 is connected to the negative electrode terminal 131b. In this way, the positive tabs 121a are connected to the positive electrode terminal 131a through the adapter component 140, and the negative tabs 121b are connected to the negative electrode terminal 131b through the adapter component 140 to form a current loop. As an example, each electrode may have two positive tabs 121a and one negative tab 121b, and the adapter component 140 may have three parts, with the three adapter components 140 connected one-to-one with the two positive tabs 121a and one negative tab 121b.

[0077] In some embodiments, the connection between the first connecting portion 141 and the electrode terminal 131 can be achieved by laser welding, and the connection between the second connecting portion 142 and the tab 121 can be achieved by ultrasonic welding. Of course, in other embodiments, the first connecting portion 141 and the electrode terminal 131, and the second connecting portion 142 and the tab 121 can also be connected by screwing, snapping, bonding, or other methods.

[0078] In this embodiment, the battery cell 11 is designed with a connecting component 140 including a reinforcing portion 144 connected to the bending portion 143. The reinforcing portion 144 can resist the deformation of the bending portion 143, so that the bending portion 143 can withstand the deformation force and remain stable. That is, the deformation amplitude of the bending portion 143 when subjected to deformation force (e.g., under the condition of the battery cell 11 being bumpy / under the condition of the second connecting portion 142 and the tab 121 being ultrasonically welded) is reduced or even the original shape can be maintained. This can reduce the degree of deformation of the connecting component 140, thereby improving the problems caused by the deformation of the connecting component 140 to the battery cell 11 (e.g., abnormal internal discharge or short circuit).

[0079] According to some embodiments of this application, please refer to Figures 3 to 5 The bending portion 143 has a first end and a second end, the first end being connected to the first connecting portion 141 and the second end being connected to the second connecting portion 142. From the first end to the second end, the bending portion 143 can be configured to extend in a direction close to the end cap 130.

[0080] exist Figures 3 to 5 In this embodiment, the housing 110 has an opening on one side. With the battery cell 11 installed in the battery device, the end cap 130 is located on top of the housing 110, the first end is located below the second end, and the first connecting portion 141 is located below the second connecting portion 142. In this embodiment, the first connecting portion 141 is located below the electrode terminal 131, and the tab 121 is located below the second connecting portion 142.

[0081] Understandably, in the technical solution where the bent portion 143 extends away from the end cap 130 from the first end to the second end, the first connecting portion 141 is located on the side of the second connecting portion 142 facing away from the main body portion 122, and the first connecting portion 141 is suspended. In this embodiment, the first connecting portion 141 is located on the side of the second connecting portion 142 facing the main body portion 122, and the first connecting portion 141 is closer to the main body portion 122 than the second connecting portion 142. Therefore, the first connecting portion 141 can abut against the main body portion 122, and the main body portion 122 can support the first connecting portion 141, which can improve the structural stability of the battery cell 11.

[0082] The bending portion 143 and the second connecting portion 142 connected to one side of the first connecting portion 141 in the adapter component 140 will be described in detail below. The bending portion 143 and the second connecting portion 142 connected to the other side of the first connecting portion 141 can be designed with reference to this, and will not be described again in this embodiment.

[0083] According to some embodiments of this application, please refer to Figure 4The reinforcing part 144 includes a first protrusion 1441, which is connected to a bend 143 and protrudes toward another bend 143. The first protrusion 1441 and the first connecting part 141 abut against the surfaces of the two second connecting parts 142.

[0084] exist Figure 4 and Figure 6 In the diagram, a first protrusion 1441 located on the left side has one end (left end) connected to a bend 143 on the left side. The first protrusion 1441 extends from one end (left end) to the other end (right end) towards the bend 143 on the right side. Similarly, a first protrusion 1441 located on the right side has one end (right end) connected to a bend 143 on the right side. The first protrusion 1441 extends from one end (right end) to the other end (left end) towards the bend 143 on the left side. In other words, the two first protrusions 1441 protrude in a direction that brings them closer to each other. The first protrusions 1441 and the bend 143 can be connected by at least one of the following methods: welding, snap-fitting, screwing, or bonding. Alternatively, the first protrusions 1441 and the bend 143 can be integrally connected. The first protrusions 1441 can protrude along a first direction or be inclined in a first direction. The first protrusion 1441 may be, but is not limited to, a cuboid, a cylinder, a polygonal prism, etc.

[0085] When the battery device composed of the battery cells 11 in this embodiment serves as the vehicle's power system, during vehicle operation, bumps and vibrations occur, causing the battery device to be alternately subjected to vertically downward and vertically upward loads. These loads are transmitted to the adapter 140, causing the bending portion 143 to be subjected to alternating loads. These alternating loads include a first deformation force and a second deformation force, which are alternately applied to the bending portion 143. Specifically, in... Figure 6 In the process, a first deformation force is applied to the bent portion 143 in a direction parallel to the direction of gravity of the battery cell 11, and points from the side of the first connecting portion 141 away from the second connecting portion 142 (lower side) to the other side of the first connecting portion 141 facing the second connecting portion 142 (upper side). The first deformation force can be referred to as F1. A second deformation force is applied to the bent portion 143 in a direction parallel to the direction of gravity of the battery cell 11, and points from the side of the first connecting portion 141 facing the second connecting portion 142 (upper side) to the other side of the first connecting portion 141 away from the second connecting portion 142 (lower side). The second deformation force can be referred to as F2. The first and second deformation forces are parallel and opposite. It can be understood that under the action of the first deformation force, the bent portion 143 tends to bend and deform towards the inside of the first connecting portion 141; under the action of the second deformation force, the bent portion 143 tends to bend and deform towards the outside of the first connecting portion 141.

[0086] During the ultrasonic welding process of connecting the second connecting part 142 and the tab 121, the ultrasonic waves are transmitted to the adapter 140, and the bent part 143 reciprocates slightly in the first direction. Therefore, the bent part 143 is subjected to alternating stress, which includes a third deformation force and a fourth deformation force. The third and fourth deformation forces are parallel and opposite to each other along the first direction, and act alternately on the bent part 143. The third deformation force extends from one side of the bent part 143 toward the connected second connecting part 142 and points to the other side of the bent part 143. (See reference...) Figure 6 In F3, the fourth deformation force originates from the side of the bent portion 143 away from the second connecting portion 142 connected to it and points to the other side of the bent portion 143, as can be seen in [reference]. Figure 6 F4. Understandably, under the action of the third deformation force, the bent portion 143 tends to bend and deform towards the inside of the first connecting portion 141; under the action of the fourth deformation force, the bent portion 143 tends to bend and deform towards the outside of the first connecting portion 141.

[0087] With this technical solution, since the first protrusion 1441 abuts against the first connecting portion 141, the bent portion 143 is difficult to bend inward toward the first connecting portion 141. In this way, the first protrusion 1441 can resist the bending deformation of the bent portion 143 toward the first connecting portion 141, thereby reducing or even eliminating the deformation amplitude of the bent portion 143 when subjected to the first deformation force and / or the third deformation force.

[0088] This embodiment does not impose specific limitations on the position of the first protrusion 1441. For example, the first protrusion 1441 may be located at the middle of a correspondingly connected bend 143 along the second direction, or, please refer to... Figure 4 The first protrusion 1441 may also be located at the end of the bent portion 143 along the second direction, and along the second direction, the first protrusion 1441 does not protrude from a correspondingly connected bent portion 143.

[0089] In some embodiments, the first protrusion 1441 may also be provided on one side of the bent portion 143 along the second direction. Here, the bent portion 143 has two opposite sides along the second direction, and the first protrusion 1441 is connected to one of the sides. In this embodiment, the first protrusion 1441 can be formed by bending a first protrusion 32 (see below) provided on the bent portion 143, thus eliminating the need to assemble the first protrusion 1441 with the bent portion 143, simplifying the manufacturing process.

[0090] According to some embodiments of this application, the reinforcing portion 144 may include a second protrusion 1442, which is connected to a bend 143 and protrudes in a direction away from another bend 143. The second protrusion 1442 is located on the side of the second connecting portion 142 facing the first connecting portion 141 and abuts against a second connecting portion 142.

[0091] exist Figure 4 and Figure 6 In the design, the second protrusion 1442 located on the left side is connected to the bent portion 143 at one end (right end). The second protrusion 1442 extends from one end (right end) to the other end (left end) in a direction away from the bent portion 143 on the right side. Similarly, the second protrusion 1442 located on the right side is connected to the bent portion 143 at one end (left end). The second protrusion 1442 extends from one end (left end) to the other end (right end) in a direction away from the bent portion 143 on the left side. In other words, the two second protrusions 1442 protrude in directions opposite to each other. The second protrusions 1442 and the bent portion 143 can be connected by at least one of the following methods: welding, snap-fitting, screwing, or bonding; or, the second protrusions 1442 and the bent portion 143 can be integrally connected. The second protrusions 1442 can protrude along a first direction or be inclined in the first direction. The second protrusion 1442 may be, but is not limited to, a cuboid, a cylinder, a polygonal prism, etc.

[0092] During the process of connecting the second connection part 142 and the electrode tab 121 by ultrasonic welding, the ultrasonic welding head presses against the side of the second connection part 142 away from the electrode tab 121, so that the second connection part 142 is subjected to pressure. The pressure is applied to the second connection part 142 along the direction of gravity of the battery cell 11, and from the side of the second connection part 142 away from the first connection part 141. Figure 6 The middle (upper side) points to the other side of the second connecting part 142 facing the first connecting part 141. Figure 6 (Middle is the lower side), pressure can be referred to Figure 6 Under pressure P, the second connecting part 142 tends to bend towards the first connecting part 141. The second end of the bent part 143 is moved by the second connecting part 142 to move away from the first connecting part 141, causing the bent part 143 to tend to bend and deform towards the outside of the first connecting part 141.

[0093] By adopting this technical solution, thanks to the fact that the second protrusion 1442 abuts against the surface of the second connecting portion 142 facing the first connecting portion 141, the contact reaction force between the second protrusion 1442 and the second connecting portion 142 makes it difficult for the second end of the bent portion 143 to deviate significantly away from the first connecting portion 141. In this way, the second protrusion 1442 can resist the bending deformation of the bent portion 143 towards the outside of the first connecting portion 141, so that the deformation amplitude of the bent portion 143 when subjected to at least one of the above-mentioned second deformation force, the above-mentioned fourth deformation force, and the above-mentioned pressure P is reduced or even eliminated.

[0094] As can be seen from the above description, in the technical solution where the reinforcing part 144 includes both the first protrusion 1441 and the second protrusion 1442, the bending part 143 can withstand the alternating load caused by bumps and the alternating stress caused by ultrasonic welding while maintaining stability. In other words, the bending part 143 can resist the vibration caused by bumps and the deformation caused by ultrasonic waves.

[0095] This embodiment does not impose specific limitations on the position of the second protrusion 1442. For example, the second protrusion 1442 may be located at the middle of the bent portion 143 along the second direction, or, please refer to [link to relevant documentation]. Figure 4 The second protrusion 1442 may also be located at the end of the bent portion 143 along the second direction.

[0096] In some embodiments, the second protrusion 1442 may also be connected to the side of the bent portion 143 along the second direction. In this embodiment, the second protrusion 1442 includes a first segment, a bent segment, and a second segment connected in sequence. One end of the first segment is connected to the side of the bent portion 143, and the other end is connected to the bent segment. The second segment is located on one side of the second connecting portion 142 along the Z direction and abuts against the second connecting portion 142. Using this technical solution, the second protrusion 1442 can be formed by bending a second protrusion 33 (see below) disposed on the side of the bent portion 143, thus eliminating the need to assemble the second protrusion 1442 with the bent portion 143, simplifying the manufacturing process.

[0097] According to some embodiments of this application, the reinforcing part 144 may include a third protrusion 1443 and a stop part 1444. The stop part 1444 is fixedly disposed on the first connecting part 141 and protrudes toward the two second connecting parts 142 relative to the first connecting part 141. The third protrusion 1443 is connected to a bending part 143 and protrudes toward another bending part 143. The stop part 1444 is used to restrict the third protrusion 1443 from moving away from the other second connecting part 142 along a first direction.

[0098] The stop portion 1444 and the first connecting portion 141 can be connected by at least one of the following methods: welding, snap-fitting, screwing, or bonding; or, the stop portion 1444 and the first connecting portion 141 can be integrally connected. The stop portion 1444 can protrude along the direction of gravity of the battery cell 11 or be inclined to the direction of gravity of the battery cell 11. The stop portion 1444 can be, but is not limited to, a cuboid, a cylinder, or a polygonal prism.

[0099] The third protrusion 1443 and the bent portion 143 can be connected by at least one of the following methods: welding, snap-fitting, screwing, or bonding; or, the stop portion 1444 and the first connecting portion 141 can be integrally connected. The cooperation between the stop portion 1444 and the third protrusion 1443 restricts the displacement of the third protrusion 1443 in the first direction, preventing the third protrusion 1443 from moving away from the other second connecting portion 142. Please refer to... Figure 4 and Figure 6 If the third protrusion 1443 on the left cannot move to the left along the first direction, then the bent portion 143 on the left and the second connecting portion 142 on the left cannot move to the left either; if the third protrusion 1443 on the right cannot move to the right along the first direction, then the bent portion 143 on the right and the second connecting portion 142 on the right cannot move to the right either.

[0100] Please refer to section 7. For ease of transport, the adapter 140 is usually joined to the second connecting portions 142 of the two electrode assemblies 120 of the electrode section. Then, the two electrode assemblies 120 are flattened (at this time, the tabs 121 are flattened, and the two electrode assemblies 120 are on the same plane). Upon arrival at the target installation location, the electrode assemblies 120 are flipped towards the side of the second connecting portion 142 facing the tabs 121, causing the two electrode assemblies 120 to gradually converge and approach each other. During this process, the tabs 121 bend. After flipping, the two electrode assemblies 120 overlap. Figure 5 As shown. It is understood that when the adapter 140 and the two flattened electrode assemblies 120 form a whole, during transportation, if they encounter bumps / vibrations or during handling, one of the second connecting portions 142 may be pulled away from the other second connecting portion 142, thus subjecting the second connecting portion 142 to a tensile force. The tensile force applied to the second connecting portion 142 causes the two second connecting portions 142 to tend to move away from each other; the tensile force can be found in [reference needed]. Figure 6 Under the action of the tensile force T, the two second connecting parts 142 tend to move away from each other, and the second end of the bent part 143 tends to be moved by the second connecting parts 142 to move away from the first connecting part 141.

[0101] This embodiment restricts the displacement of the third protrusion 1443 in the first direction, preventing the third protrusion 1443 from moving away from the other second connecting portion 142. This makes it difficult for the second end of the bent portion 143 to deviate significantly away from the first connecting portion 141. The third protrusion 1443 can resist the bending deformation of the bent portion 143 towards the first connecting portion 141, thereby reducing or even eliminating the deformation amplitude of the bent portion 143 when subjected to at least one of the second deformation force, the fourth deformation force, and the tensile force T.

[0102] According to some embodiments of this application, the third protrusion 1443 is further configured to abut against the surface of the first connecting portion 141 toward the two second connecting portions 142.

[0103] exist Figure 4 and Figure 6 In the middle, the third protrusion 1443 is located on the upper side of the first connecting part 141 and abuts against the upper surface of the first connecting part 141.

[0104] Since the third protrusion 1443 abuts against the first connecting portion 141, the bent portion 143 is difficult to bend inward toward the first connecting portion 141. Thus, the third protrusion 1443 can also resist the bending deformation of the bent portion 143 toward the first connecting portion 141, thereby reducing or even eliminating the deformation amplitude of the bent portion 143 when subjected to the first deformation force and / or the third deformation force.

[0105] As can be seen from the above description, in the technical solution where the stop portion 1444 is used to restrict the movement of the third protrusion 1443 in the first direction away from the other second connecting portion 142, and the third protrusion 1443 also abuts against the surface of the first connecting portion 141 toward the two second connecting portions 142, the bending portion 143 can simultaneously withstand the alternating load caused by bumps and the alternating stress caused by ultrasonic welding and maintain stability.

[0106] The structure of the third protrusion 1443 is varied. In some embodiments, the third protrusion 1443 may be L-shaped or a hook, with the third protrusion 1443 hooking onto the stop 1444, and a portion of the third protrusion 1443 located on the side of the stop 1444 opposite to the bend 143.

[0107] According to some embodiments of this application, the third protrusion 1443 may also be configured to be sleeved on the outer periphery of the stop portion 1444.

[0108] The third protrusion 1443 is annular. In this example, the third protrusion 1443, the bending part 143, and the stop part 1444 are all connected to the first connecting part 141 by assembly. After one of the third protrusion 1443 and the stop part 1444 is fixedly installed, the third protrusion 1443 and the stop part 1444 are fitted together, and then the other of the third protrusion 1443 and the stop part 1444 is fixedly installed.

[0109] Please refer to some embodiments of this application. Figure 4 The third protrusion 1443 can also be configured to include a first connecting part 1443a, a bent part 1443b, and a second connecting part 1443c connected in sequence. The first connecting part 1443a is connected to the bent part 143. The first connecting part 1443a and the second connecting part 1443c are located on both sides of the stop part 1444 along the second direction. The first direction and the second direction are perpendicular to the gravity direction of the battery cell 11.

[0110] The bent portion 1443b can be arc-shaped, and the third protrusion 1443 can be U-shaped. The third protrusion 1443 is connected to the bend and forms a space, within which the stop portion 1444 is located. Alternatively, the bent portion 1443b can be right-angled, and the third protrusion 1443 can be P-shaped. The first connecting portion 1443a and the bent portion 143 can be connected by at least one of the following methods: welding, snap-fitting, screwing, or bonding. Alternatively, the first connecting portion 1443a and the bent portion 143 can be integrally connected.

[0111] Understandably, during the process of connecting the second connecting part 142 and the tab 121 using ultrasonic welding, ultrasonic waves are transmitted to the adapter 140, and the bent part 143 also reciprocates slightly in the second direction, meaning that the bent part 143 is also subjected to alternating external forces in the second direction. When the third protrusion 1443 is sleeved on the stop part 1444 or is composed of the first connecting part 1443a, the bent part 1443b, and the second connecting part 1443c, the stop part 1444 can also constrain the displacement of the third protrusion 1443 in the second direction, thereby making it difficult for the bent part 143 connected to the third protrusion 1443 to move in the second direction. This can resist the deformation tendency of the bent part 143 caused by vibration in the second direction.

[0112] In some embodiments, the first connecting portion 1443a, the bent portion 1443b, and the second connecting portion 1443c can be independent components, which are assembled to form the third protrusion 1443.

[0113] According to some embodiments of this application, the third protrusion 1443 may be formed by multiple bends. Specifically, the fourth protrusion 35 (see below) may be folded around the stop portion 1444 away from the bend portion 143 and toward the other side of the stop portion 1444 in the second direction to form the third protrusion 1443.

[0114] Compared with the technical solution of assembling the first connecting part 1443a, the bent part 1443b and the second connecting part 1443c to form the third protrusion 1443, this embodiment makes the first connecting part 1443a, the bent part 1443b and the second connecting part 1443c integrally connected, which can save the assembly process and simplify the manufacturing process.

[0115] According to some embodiments of this application, the reinforcing part 144 may include a fourth protrusion (not shown in the figure), which is fixedly connected to the first connecting part 141 and abuts against the surface of one bending part 143 facing away from the other bending part 143.

[0116] The fourth protrusion and the first connecting portion 141 can be connected by at least one of the following methods: welding, snap-fitting, screwing, or bonding; or, the fourth protrusion and the first connecting portion 141 can be integrally connected. For example, the fourth protrusion can be L-shaped, with one end connected to the first connecting portion 141 and the other end extending to the side of the second connecting portion 142 facing the first connecting portion 141 and abutting against the bent portion 143.

[0117] In some embodiments, the fourth protrusion abuts against the second end of the bent portion 143.

[0118] Please refer to the preceding content. Figure 7 After the adapter 140 and the second connecting portions 142 of the two electrode assemblies 120 of the electrode section are transported to the target installation location, the two electrode assemblies 120 are flattened, and the electrode assemblies 120 are rotated towards the side of the second connecting portions 142 facing the tab 121. It is understood that during the rotation of the electrode assemblies 120, the second connecting portions 142 will be subjected to torque; the torque can be found in [reference needed]. Figure 4 Under the action of torque W, the second connecting portion 142 tends to bend toward the side where the first connecting portion 141 is located, and the second end of the bent portion 143 tends to be moved by the second connecting portion 142 to bend and deform outward toward the first connecting portion 141.

[0119] By adopting this technical solution, the fourth protrusion abuts against the surface of one bent portion 143 facing away from the other bent portion 143. The fourth protrusion will prevent the bent portion 143 from bending outward toward the first connecting portion 141. Therefore, the deformation amplitude of the bent portion 143 under the influence of at least one of the second deformation force, the fourth deformation force, the pressure P, and the torque W is reduced or even eliminated.

[0120] In some embodiments, the second connecting portion 142, the bending portion 143, and the first connecting portion 141 are each an independent sheet material, and multiple sheets are spliced ​​together. The second connecting portion 142, the first connecting portion 141, the bending portion 143, and the reinforcing portion 144 can be connected by welding.

[0121] According to some embodiments of this application, the adapter 140 can be constructed as a single-piece molded part. That is, the second connecting part 142, the first connecting part 141, the bending part 143, and the reinforcing part 144 are integrally connected.

[0122] In this embodiment, an exemplary fabrication process for the adapter 140 may include the following steps.

[0123] Step a), a thin plate-like structure is prepared by processes such as cutting. Figure 8 The plate component 30 shown includes a plate body 31, which comprises a first part 311, two second parts 312, and two third parts 313. The first part 311 is connected to the two second parts 312 on both sides along a first direction, and the two second parts 312 are connected to the two third parts 313 in a one-to-one correspondence. The second parts 312 have a first protrusion 32 and a second protrusion 33 protruding on one side along a second direction. The first part 311 has a third protrusion 34 protruding along the second direction, and the second part 312 has a fourth protrusion 35 protruding along the second direction. The third protrusion 34 and the fourth protrusion 35 are located on the same side of the third part 313 along the second direction and protrude in a direction away from the first protrusion 32 and the second protrusion 33. The first part 311 has a central axis M, which is parallel to the second direction, and the plate component 30 is symmetrically arranged about the central axis M.

[0124] Step b), bend the first protrusion 32 by 90° and the third protrusion 34 by 90°, so that both the first protrusion 32 and the third protrusion 34 face towards Figure 8 The upper part of the medium-sized plate body 31 protrudes.

[0125] Step c), connect the second part 312 and the third part 313 along the connection between the second part 312 and the first part 311 (see reference). Figure 8 The dashed line (N) bends upward toward the plate body 31 until the first protrusion 32 comes into contact with the plate body 31.

[0126] Step d), the fourth protrusion 35 is bent from one side of the third protrusion 34 along the second direction around the free end of the third protrusion 34 to the other side of the third protrusion 34 along the second direction.

[0127] Step e), move the third part 313 along the connection between the third part 313 and the second part 312 (see reference). Figure 8 The dashed line L bends toward the side away from the first part 311.

[0128] Step f), bend the second protrusion 33 90° toward the side of the second part 312 facing the connected third part 313.

[0129] Thus, the first part 311 forms the first connecting part 141, the second part 312 forms the bending part 143, the third part 313 forms the second connecting part 142, the first protrusion 32 is bent to form the first protrusion 1441, the second protrusion 33 is bent to form the second protrusion 1442, the third protrusion 34 is bent to form the stop part 1444, and the fourth protrusion 35 is bent to form the third protrusion 1443.

[0130] This technical solution eliminates the need for assembly steps of the second connecting part 142, the first connecting part 141, the bending part 143, and the reinforcing part 144, simplifying the manufacturing process. Furthermore, without increasing costs, the structural strength of the adapter 140 can be improved, thus enhancing the deformation resistance of the reinforcing part 144.

[0131] An embodiment of the second aspect of this application provides a battery device, such as... Figure 2 As shown, it includes the battery cell 11 in the above embodiments. It is understood that the battery device provided in this application, by using any of the above-described battery cells 11, has all the beneficial effects of the battery cells 11, which will not be repeated here.

[0132] An embodiment of the third aspect of this application provides an electrical device including the battery device described in the above embodiments, the battery device being used to provide electrical energy. The electrical device includes vehicles (such as vehicles, electric vehicles, ships, spacecraft, etc.), display devices (such as mobile phones, tablets, laptops, etc.), electric toys, power tools, etc. It is understood that the electrical device provided in this application, by utilizing any of the aforementioned battery cells 11, possesses all the beneficial effects of the aforementioned battery cells 11, which will not be elaborated further here.

[0133] An embodiment of the fourth aspect of this application provides an energy storage device, which includes the battery device described in the above embodiments, the battery device being used for energy storage. The energy storage device may include, but is not limited to, centralized energy storage devices (e.g., containerized energy storage devices), distributed energy storage devices, portable energy storage devices, wearable energy storage devices, etc. It is understood that the energy storage device provided in this application, by utilizing any of the aforementioned battery cells 11, possesses all the beneficial effects of the aforementioned battery cells 11, which will not be elaborated further here.

[0134] 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.

[0135] A specific embodiment of this application is described below. It should be understood that this specific embodiment is described for illustrative purposes only and should not be construed as limiting the scope of this application.

[0136] Will Figure 8 The flat plate component 30 shown is prepared into a transition component 140 according to steps a) to f) above, and then the transition component 140 is applied to the battery cell 11. Specifically, the transition component 140 includes a first connecting portion 141, two second connecting portions 142, two bending portions 143, and two reinforcing portions 144. The two second connecting portions 142 are located on both sides of the first connecting portion 141 along a first direction. The second connecting portions 142 are connected to the first connecting portion 141 through the bending portions 143. The bending portions 143 have a first end and a second end. The first end is connected to the first connecting portion 141, and the second end is connected to the second connecting portion 142. The two bending portions 143 correspond one-to-one with the two reinforcing portions 144 and are connected. Each of the two reinforcing portions 144 is configured to resist deformation of the corresponding bending portion 143.

[0137] The first connecting portion 141 is connected to the electrode terminal 131, and the two second connecting portions 142 correspond one-to-one with and are connected to the two tabs of the two electrode assemblies 120. Furthermore, the first connecting portion 141 is closer to the main body 122 of the electrode assembly 120 than the second connecting portions 142.

[0138] The reinforcing part 144 includes a first protrusion 1441 and a second protrusion 1442; and / or, the reinforcing part 144 includes a third protrusion 1443 and a stop 1444.

[0139] The first protrusion 1441 is connected to a corresponding bend 143 and protrudes toward the other bend 143. The first protrusion 1441 and the first connecting portion 141 abut against the surfaces of the two second connecting portions 142. The second protrusion 1442 is connected to the second end of a corresponding bend 143 and protrudes away from the other bend 143. The second protrusion 1442 is located on the side of the second connecting portion 142 facing the first connecting portion 141 and abuts against one of the second connecting portions 142. The cooperation of the first protrusion 1441 and the second protrusion 1442 strengthens the ends (first end and second end) of the bend 143. The first protrusion 1441 can resist the bend 143 bending inward toward the first connecting portion 141, and the second protrusion 1442 can resist the bend 143 bending outward toward the first connecting portion 141. In this way, the bent part 143 can withstand the alternating load caused by bumps and the alternating stress caused by ultrasonic welding while maintaining stability.

[0140] A stop portion 1444 is fixedly disposed on the first connecting portion 141 and protrudes toward the two second connecting portions 142 relative to the first connecting portion 141. A third protrusion 1443 is connected to a corresponding bending portion 143, and the third protrusion 1443 extends from one side of the stop portion 1444 along the second direction to the other side of the stop portion 1444 along the second direction. The third protrusion 1443 also abuts against the surface of the first connecting portion 141 toward the two second connecting portions 142. The abutting relationship between the third protrusion 1443 and the first connecting portion 141 can resist the bending of the bending portion 143 toward the inside of the first connecting portion 141, and the mating relationship between the third protrusion 1443 and the stop portion 1444 can resist the bending of the bending portion 143 toward the outside of the first connecting portion 141. In this way, the bending portion 143 can withstand the alternating load caused by bumps and the alternating stress caused by ultrasonic welding while maintaining stability.

[0141] 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 shell has an opening; An end cap that covers the opening, the end cap including electrode terminals; An electrode portion is housed in the housing, the electrode portion comprising two electrode assemblies stacked along a first direction, the electrode assemblies being provided with tabs; An adapter component for electrically connecting the electrode terminals to the tabs; The adapter includes a first connecting portion, two second connecting portions, and two bending portions. The two second connecting portions are located on both sides of the first connecting portion along the first direction. The second connecting portions are connected to the first connecting portion through the bending portions. The first connecting portion is connected to the electrode terminal. The two second connecting portions correspond one-to-one with and are connected to the tabs of the two electrode assemblies. The adapter also includes a reinforcing portion connected to the bending portions. The reinforcing portion is configured to resist deformation of the bending portions.

2. The battery cell according to claim 1, characterized in that, The reinforcing portion includes a first protrusion, which is connected to one of the bending portions and protrudes toward the other bending portion. The first protrusion abuts against the surface of the first connecting portion toward the two second connecting portions.

3. The battery cell according to claim 2, characterized in that, The reinforcing portion includes a second protrusion, which is connected to one of the bent portions and protrudes in a direction away from the other bent portion. The second protrusion is located on the side of a second connecting portion facing the first connecting portion and abuts against the second connecting portion.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The reinforcing part includes a third protrusion and a stop. The stop is fixedly disposed on the first connecting part and protrudes toward the two second connecting parts relative to the first connecting part. The third protrusion is connected to one of the bending parts and protrudes toward the other bending part. The stop is used to restrict the third protrusion from moving away from the other second connecting part along the first direction.

5. The battery cell according to claim 4, characterized in that, The third protrusion abuts against the surface of the first connecting portion facing the two second connecting portions.

6. The battery cell according to claim 4, characterized in that, The third protrusion is configured to be fitted around the outer periphery of the stop portion.

7. The battery cell according to claim 4, characterized in that, The third protrusion includes a first connecting portion, a bent portion, and a second connecting portion connected in sequence. The first connecting portion is connected to one of the bent portions. The first connecting portion and the second connecting portion are located on both sides of the stop portion along the second direction. The first direction and the second direction are perpendicular to the gravity direction of the battery cell.

8. The battery cell according to claim 7, characterized in that, The third protrusion is formed by multiple bending.

9. The battery cell according to any one of claims 1 to 3, characterized in that, The reinforcing part includes a fourth protrusion, which is fixedly connected to the first connecting part, and the fourth protrusion abuts against the surface of one of the bending parts facing away from the other bending part.

10. The battery cell according to any one of claims 1 to 3, characterized in that, The adapter component is a one-piece molded part.

11. The battery cell according to any one of claims 1 to 3, characterized in that, The bending portion has a first end and a second end, the first end being connected to the first connecting portion and the second end being connected to the second connecting portion; from the first end to the second end, the bending portion extends toward the end cap.

12. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 11.

13. An electrical appliance, characterized in that, The electrical equipment includes the battery device as described in claim 12, the battery device being used to provide electrical energy.

14. An energy storage device, characterized in that, The energy storage device includes the battery device as described in claim 12, the battery device being used to store electrical energy.

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