Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. Wherein the battery monomer comprises a shell, an end cover, an electrode assembly and an electric connection assembly, the electrode assembly is accommodated in the shell, and the end cover is provided with an electrode terminal; the electrode terminal is electrically connected with the electrode assembly through the electric connection assembly; the electric connection assembly comprises a current collecting piece and at least one adapter piece connected to the current collecting piece, and the adapter piece is connected with the current collecting piece in a clamped mode. According to the invention, the stability of the electric connection assembly in the single battery can be enhanced, the risk that the current collector and the adapter fall off is reduced, and the assembly efficiency of the single battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to battery cells, batteries and electrical devices. Background Art

[0002] New energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the energy storage field, etc.

[0003] In new energy vehicles equipped with batteries, the batteries can be used to provide power in whole or in part. In the energy storage field, the batteries can be installed in an energy storage box or directly installed on the user side. Inside the battery cell of the battery, an electrical connection component is usually provided, and the electrical connection component is used to connect the electrode component and the electrode terminal. In the assembly scenario of the electrical connection component, there is an undesirable situation where the adapter and the current collector are accidentally separated and detached. Therefore, how to fix the adapter and the current collector is one of the research topics in the industry. Summary of the Utility Model

[0004] To solve the above technical problems, the present application provides a battery cell, a battery and an electrical device with high stability.

[0005] The present application is implemented through the following technical solutions.

[0006] In a first aspect of an embodiment of the present application, a battery cell is provided, including a housing, an end cover, an electrode assembly and an electrical connection component. The electrode assembly is accommodated in the housing, and the end cover is provided with an electrode terminal; the electrode terminal is electrically connected to the electrode assembly through the electrical connection component; the electrical connection component includes a current collector and at least one adapter connected to the current collector, and the adapter is snap-connected to the current collector.

[0007] Since the adapter stack is snap-connected to the current collector, the connection between the adapter and the current collector can be strengthened, the connection stability can be improved, the risk of detachment during assembly can be reduced, and the assembly efficiency of the battery cell can be increased.

[0008] In some embodiments, the number of the adapters is multiple, and they are stacked to form an adapter stack, and the adapter stack is snap-connected to the current collector.

[0009] Thus, multiple adapters can form an adapter stack. The adapter stack can be bent and deformed while enhancing the structural strength, and is convenient for being assembled into the housing. In addition, multiple adapters can also improve the current-carrying capacity of the electrical connection component.

[0010] In some embodiments, the recessed portion is provided on the adapter laminate, and the protruding portion is provided on the current collector. The recessed portion and the protruding portion cooperate to engage the adapter laminate with the current collector.

[0011] Since the protruding portion and the recessed portion can cooperate and be fixed, the engagement connection between the adapter laminate and the current collector can be achieved through a simple structure, strengthening the fixing effect between the adapter laminate and the current collector and reducing the risk of separation and detachment between the two.

[0012] In some embodiments, the recessed portion includes a through hole into which the protruding portion can be inserted, and the through hole is provided on the adapter laminate.

[0013] Since the recessed portion can be a through hole, it is convenient for the protruding portion to be inserted and play a role in precise positioning, and can also improve the assembly speed of the adapter laminate and the current collector.

[0014] In some embodiments, the protruding portion includes a through portion located in the through hole and a bent portion connected to the through portion; the bent portion is in a bent state relative to the through portion; along a first direction, a part of the adapter laminate is located between the bent portion and the current collector, and the first direction is the thickness direction of the adapter laminate.

[0015] Since the protruding portion has a bent portion that can be bent, it can effectively limit the relative movement between the adapter laminate and the current collector in the thickness direction of the adapter laminate, further strengthening the fixed connection between the adapter laminate and the current collector and reducing the risk of separation and detachment between the two.

[0016] In some embodiments, the adapter laminate has a first end connected to the current collector and a second end connected to the end cap, and the bent portion is bent toward the side where the first end is located.

[0017] Thereby, the detachment of the adapter laminate from the engaged position can be restricted, the constraint reaction force at the engaged position can be further increased, the engagement effect can be enhanced, and the risk of separation and detachment between the adapter laminate and the current collector can be reduced.

[0018] In some embodiments, along the first direction, the current collector has a first surface facing the side where the adapter stack is located, and a second surface facing away from the side where the adapter stack is located. The protruding portion extends from the second surface and protrudes beyond the first surface; the bent portion is bent in a second direction relative to the through hole. The total length of the protruding portion is the sum of the length of the through hole along the first direction starting from the second surface and the length of the bent portion along the second direction. The length of the through hole along the first direction starting from the second surface is the sum of the thickness of the adapter stack and the thickness of the current collector portion. The length of the bent portion along the second direction is not less than 4 mm and does not exceed the minimum distance between the edge of the through hole and the first end.

[0019] Since the length of the bent portion is within a suitable range, the bent portion with a suitable length can achieve a good clamping effect, will not protrude beyond the first end to scratch other components, and can also reduce production costs and processing difficulties.

[0020] In some embodiments, the length of the bent portion along the second direction is 45% to 55% of the minimum distance between the edge of the through hole and the first end.

[0021] Thus, the length of the bent portion can take into account both the clamping effect and the current-carrying effect of the electrical connection component, and can also control production costs.

[0022] In some embodiments, the thickness of the protruding portion is the same as the thickness of the current collector.

[0023] Since the thickness of the protruding portion is the same as the thickness of the current collector, the current-carrying capacity of the current collector can be improved while reducing the processing difficulty of the current collector.

[0024] In some embodiments, the current collector has a notch. The protruding portion and the current collector are an integral part, and one end of the protruding portion is connected to the edge of the notch in the second direction.

[0025] Since the protruding portion and the current collector are integrally formed, the current-carrying capacity of the current collector can be improved while reducing the processing difficulty of the current collector.

[0026] In some embodiments, the through hole is an elongated hole; along a third direction perpendicular to the first direction and the second direction, the length of the through hole is not less than the length of the protruding portion along the third direction.

[0027] Since the length of the through hole is not less than the length of the protruding portion, it is convenient for the protruding portion to be inserted into the rectangular through hole, improving the positioning effect and further reducing the assembly difficulty between the adapter stack and the current collector.

[0028] In some embodiments, along the third direction, the difference between the length of the through hole and the length of the convex portion is 1 mm.

[0029] Thereby, it is possible to take into account both the assembly efficiency and the precise positioning effect of the adapter stack and the current collector, and it is also possible to prevent the relative movement of the adapter stack and the current collector in a direction perpendicular to the second direction to a certain extent, further enhancing the latching effect.

[0030] In some embodiments, the number of adapters included in the adapter stack is any natural number from 2 to 10.

[0031] Thereby, it is beneficial for the adapter stack to be bent and then inserted into the housing, further improving the current-carrying capacity of the electrical connection assembly.

[0032] In some embodiments, the adapter stack and the current collector are fixed by welding.

[0033] Since the adapter stack and the current collector adapter are connected and fixed by welding, the stability of the latching fixation can be further improved, the resistance of the electrical connection assembly can be reduced, and the current-carrying capacity of the electrical connection assembly can be improved.

[0034] In some embodiments, the battery cell includes a cylindrical battery.

[0035] Since the battery cell includes a cylindrical battery, the electrical connection assembly connecting the electrode terminal and the electrode assembly can be accommodated in the housing by bending and folding, improving the assembly efficiency and reliability of the cylindrical battery.

[0036] A second aspect of the embodiments of the present application provides a battery, including a box body and at least one battery cell of the first aspect of the embodiments of the present application accommodated in the box body.

[0037] Since the battery includes the battery cell disclosed in the first aspect of the embodiments of the present application, the risk of separation and detachment of the electrical connection assembly during assembly can be reduced, and thus the assembly efficiency and reliability of the battery can be improved.

[0038] A third aspect of the embodiments of the present application provides an electrical device, and the electrical device includes the battery cell of the first aspect of the embodiments of the present application or the battery of the second aspect of the embodiments of the present application for providing electrical energy.

[0039] Since the electrical device includes the battery cell of the first aspect of the embodiments of the present application or the battery of the second aspect of the embodiments of the present application, the assembly efficiency and reliability of the battery can be improved, and the assembly efficiency and reliability of the electrical device can be further improved.

[0040] Utility model effect

[0041] Through this application, the stability of the electrical connection components in the battery cell can be enhanced, the risk of the current collector and the adapter falling off can be reduced, and the assembly efficiency and reliability of the battery cell can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of this application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0043] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of this application;

[0044] Figure 2 is a three-dimensional exploded schematic diagram of a battery provided by some embodiments of this application;

[0045] Figure 3 is a three-dimensional exploded schematic diagram of a battery cell provided by some embodiments of this application;

[0046] Figure 4 is a schematic structural diagram of an electrical connector in a non-bent state provided by some embodiments of this application;

[0047] Figure 5 is a schematic structural diagram of an adapter laminate provided by some embodiments of this application;

[0048] Figure 6 is a three-dimensional exploded schematic diagram of an electrical connector in a bent state provided by some embodiments of this application;

[0049] Figure 7 is a schematic structural diagram of an adapter provided by some embodiments of this application;

[0050] Figure 8 is a schematic structural diagram of a current collector provided by some embodiments of this application;

[0051] DESCRIPTION OF THE REFERENCE NUMERALS

[0052] 1000 - Vehicle, 100 - Battery, 101 - Box Body, 102 - Cover, 103 - Lower Box Body, 200 - Controller, 300 - Motor, 1 - Battery Cell, 2 - Housing, 3 - Electrode Assembly, 4 - End Cover, 4A - Electrode Terminal, 5 - Electrical Connection Assembly, 6 - Current Collector, 6A - Positioning Hole, 6B - Groove, 6C - Notch, 7 - Adapter Stack, 7A - First End, 7B - Second End, 8 - Engaging Structure, 9 - Protrusion, 9A - Through - Hole, 9B - Bent Portion, 10 - Through - Hole, 10A - First Edge, 10B - Second Edge, 11 - First Surface, 12 - Second Surface, 13 - Adapter, 14 - Welding Area, 15 - Terminal Connection Hole. Detailed Embodiment

[0053] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above - mentioned drawings are intended to cover non - exclusive inclusion.

[0055] In the description of the embodiments of this application, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary - secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means more than two, unless otherwise specifically defined.

[0056] Referring to "embodiment" herein means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0057] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0058] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0059] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0061] Below, this application is described in detail.

[0062] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0063] In the battery assembly scenario, the electrode terminal provided on the end cap needs to be connected to the electrode assembly through an electrical connection assembly, wherein the electrical connection assembly has the problem of unstable connection between the current collector and the adapter, resulting in the undesirable situation of falling off. Therefore, how to achieve a stable connection between the current collector and the adapter becomes a problem.

[0064] Through research, it is found that if the adapter stack is snap-connected with the current collector, the structural stability of the electrical connection assembly can be easily enhanced, effectively reducing the risk of separation and detachment of the current collector and the adapter stack.

[0065] Based on such a design concept, the present application designs a battery cell, which includes a housing, an end cap, an electrode assembly and an electrical connection assembly. The electrode assembly is accommodated in the housing, and the end cap is provided with electrode terminals; the electrode terminals and the electrode assembly are electrically connected through the electrical connection assembly; the electrical connection assembly includes a current collector and at least one adapter connected to the current collector, and the adapter is snap-connected to the current collector.

[0066] Since the adapter is snap-connected to the current collector, the connection between the adapter and the current collector can be strengthened, the connection stability can be improved, the risk of falling off during assembly can be reduced, and the assembly efficiency of the battery cell can be further improved.

[0067] The battery cells provided in the embodiments of the present application can be grouped into multiple cells for use as a battery. Therefore, the embodiments of the present application also provide a battery including the above-mentioned battery cells. The battery can also be used, but is not limited to, in electrical devices and energy storage devices.

[0068] The embodiments of the present application also provide an electrical device including the above-mentioned battery cell or battery. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0069] The battery cells provided in the embodiments of the present application can also be grouped into multiple cells for use as a battery. The battery can also be used, but is not limited to, in electrical devices such as energy storage power systems, vehicles, ships or aircraft. Using the battery can provide a higher total energy.

[0070] In the following embodiments, for the convenience of description, the electrical device in an embodiment of the present application is taken as the vehicle 1000 as an example for description. The following is described with reference to the accompanying drawings.

[0071] Figure 1 It is a schematic structural diagram of the vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.

[0072] As Figure 1As shown, a battery 100 is disposed inside a vehicle 1000. The battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can serve as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start-up, navigation, and driving of the vehicle 1000.

[0073] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0074] Figure 2 and Figure 3 FIG. is a three-dimensional exploded view of the battery 100 provided in the embodiments of the present application. As Figure 2 and Figure 3 shown, the battery 100 includes a lower box body 103, a cover body 102, and at least one battery cell 1. The cover body 102 covers the upper part of the lower box body 103, thereby forming an accommodation space for the battery cell 10 between the lower box body 103 and the cover body 102.

[0075] In the battery 100, there can be multiple battery cells 1. The multiple battery cells 1 can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 1. The multiple battery cells 1 can be directly connected in series, parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 1 is placed in the accommodation space formed between the lower box body 103 and the cover body 102. Of course, the battery 100 can also be in the form that multiple battery cells 1 are first connected in series, parallel, or in a mixed connection to form battery modules, and then the multiple battery modules are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the accommodation space formed between the lower box body 103 and the cover body 102. The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for realizing the electrical connection between the multiple battery cells 1.

[0076] In the embodiments of the present application, the battery cell 1 can be a secondary battery. A secondary battery refers to a battery cell that can be activated by charging after discharging so as to continue to be used.

[0077] The battery cell 1 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application do not limit this.

[0078] Although not shown in the figure, the battery cell 1 generally includes an electrode assembly 3. The electrode assembly 3 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting to a certain extent, while allowing active ions to pass through.

[0079] In some embodiments, the electrode assembly 3 is provided with a tab (not shown), which can lead current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0080] In some embodiments, the battery cell 1 may include a shell. The shell is used to encapsulate the electrode assembly 3 and the electrolyte and other components. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film.

[0081] As an example, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0082] In some embodiments, Figure 3 As shown, the housing includes a shell 2 and an end cap 4. The shell 2 is provided with an opening, and the end cap 4 closes the opening to form a closed space for accommodating the electrode assembly 3 and electrolyte and other substances. The shell 2 may be provided with one or more openings. One or more end caps 4 may also be provided.

[0083] In some embodiments, the housing may be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing plays a role in protecting the electrode assembly, and a sealing bag is also included between the housing and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film.

[0084] In some embodiments, Figure 3 As shown, at least one electrode terminal 4A is provided on the housing, and the electrode terminal 4A is electrically connected to the pole lug (not shown). The electrode terminal 4A can be directly connected to the pole lug, or indirectly connected to the pole lug through a transition component. The electrode terminal 4A can be provided on the end cap 4, or on the housing 2.

[0085] Below, refer to Figures 3 to 8 Some embodiments of the present application are described in detail.

[0086] Figure 3 A three-dimensional exploded schematic diagram of a battery cell provided in some embodiments of the present application; Figure 4Schematic diagram of the structure of the electrical connector provided in some embodiments of the present application when not in a bent state; Figure 5 Schematic diagram of the structure of the adapter laminate provided in some embodiments of the present application; Figure 6 Exploded perspective view of the electrical connector provided in some embodiments of the present application when in a bent state; Figure 7 Schematic diagram of the structure of the adapter provided in some embodiments of the present application; Figure 8 Schematic diagram of the structure of the current collector provided in some embodiments of the present application.

[0087] In some embodiments of the present application, for ease of explanation, a first direction, a second direction, and a third direction are defined. The directions in which the first direction, the second direction, and the third direction are located are directions that intersect each other. Here, intersecting each other includes perpendicular intersection. For ease of understanding the embodiments of the present application, in Figures 3 to 8 the illustrated embodiments, an example where the first direction, the second direction, and the third direction are perpendicular to each other is used for explanation. However, those skilled in the art should understand that the embodiments of the present application are not limited to the case where the three directions are perpendicular to each other. In a specific embodiment, the first direction may be the layer thickness direction of the adapter, the second direction may be the bending direction of the bending portion, and the third direction may be a direction perpendicular to the first direction and the second direction. For ease of explanation, as Figures 3 to 8 shown by the arrows in, the direction where the arrow X is located is the second direction, the direction where the arrow Y is located is the third direction, and the direction where the arrow Z is located is the first direction. Sometimes the direction in which the arrow Z points along the first direction is also referred to as "upward", and the opposite direction is referred to as "downward"; the first direction also refers to the top-bottom direction.

[0088] A first aspect of the embodiments of the present application provides a battery cell 1, which includes a housing 2, an end cap 4, an electrode assembly 3, and an electrical connection assembly 5. The electrode assembly 3 is accommodated in the housing 2, and the end cap 4 is provided with an electrode terminal 4A; the electrode terminal 4A is electrically connected to the electrode assembly 3 through the electrical connection assembly 5; the electrical connection assembly 5 includes a current collector 6 and an adapter 13 connected to the current collector 6, and the adapter 13 is snap-fitted to the current collector 6.

[0089] Snap-fitting refers to a state in which the adapter 13 and the current collector 6 at least partially overlap in the layer thickness direction of the adapter.

[0090] Optionally, the battery cell 1 may be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, and has more than one end cap 4. In Figures 3 to 8 the illustrated specific embodiment, the battery cell 1 is in a cylindrical shape.

[0091] Optionally, the end cap 4 may be provided with a positive electrode terminal and a negative electrode terminal. The positive electrode terminal may be electrically connected to the positive tab, and the negative electrode terminal may be electrically connected to the negative tab.

[0092] Optionally, the positive electrode terminal and the negative electrode terminal may have any number. The positive electrode terminal and the negative electrode terminal may be provided on the same end cap 4 or on different end caps 4.

[0093] Optionally, the electrical connection component 5 between the electrode terminal 4A and the electrode assembly 3 may be one or more.

[0094] In an embodiment of the present application, the electrical connection component 5 includes a current collector 6 and an adapter 13 connected to the current collector 6. Exemplarily, the current collector 6 can function as an overcurrent component. The current collector 6 can be a disc-shaped current collector 6 or a sheet-shaped current collector 6. The present application does not limit the shape of the current collector 6.

[0095] In an embodiment of the present application, the electrical connection component 5 includes a current collector 6 and an adapter 13 connected to the current collector 6. The current collector 6 and the adapter 13 may be directly connected or may be connected through a conductive intermediate member.

[0096] In a specific embodiment, the current collector 6 and the adapter 13 may be directly connected. As Figure 4 、 Figure 5 shown, the adapter 13 and the current collector 6 are snap-connected through a snap structure 8.

[0097] Exemplarily, the snap structure 8 may be a structure in which a convex structure and a concave structure cooperate with each other and snap together. The snap structure 8 can enhance the fixing effect between the adapter 13 and the current collector 6.

[0098] Optionally, a concave structure may be provided on the adapter 13, and a structure that cooperates with it for snap connection may be provided on the current collector 6; alternatively, a concave structure may be provided on the current collector 6, and a structure that cooperates with it for snap connection may be provided on the adapter 13.

[0099] Thereby, a reliable connection between the adapter 13 and the current collector 6 can be achieved through a simple structure, improving the connection stability of the electrical connection component 5, reducing the risk of detachment during assembly, and improving the assembly efficiency of the battery cell 1.

[0100] In an embodiment of the present application, as Figure 3 、 Figure 4 、 Figure 5 shown, the number of adapters 13 is multiple, and they are stacked to form an adapter stack 7, and the adapter stack 7 is snap-connected to the current collector 6.

[0101] In a specific embodiment, the adapter members 13 are stacked along the thickness direction of the adapter member to form an adapter member stack 7. Thus, the adapter member stack 7 can be suitable for bending deformation while enhancing the structural strength, and is convenient for being assembled into the housing 2. In addition, multiple adapter members 13 can also improve the current-carrying capacity of the electrical connection assembly 5.

[0102] In the embodiment of the present application, the number of the adapter members 13 included in the adapter member stack 7 can be any natural number from 2 to 10. The number of the adapter members 13 can also be 1. At this time, a single adapter member 13 is snap-connected to the current collector 6.

[0103] Optionally, the number of the adapter members 13 included in the adapter member stack 7 can be any one of 2, 3, 4, 5, 6, 7, 8, 9, and 10.

[0104] Exemplarily, as Figure 6 、 Figure 7 shown, the thickness D of the adapter member stack 7 is equal to the sum of the thicknesses d of n adapter members 13, where n represents the number of the adapter members 13, and n is a natural number greater than or equal to 1, and further a natural number greater than or equal to 2. In a specific embodiment, the adapter member stack 7 includes 3 adapter members 13 stacked.

[0105] Thus, an appropriate adapter member stack 7 can be set according to the requirements for the current-carrying capacity of the electrical connection assembly 5. In the embodiment of the present application, the battery cell 1 is a cylindrical battery.

[0106] In a specific embodiment, as Figure 3 shown, the battery cell 1 is a cylindrical battery, and the cylindrical battery can have two end caps 4, and each end cap 4 is provided with an electrode terminal 4A.

[0107] Exemplarily, the electrode terminals 4A of the two end caps 4 are respectively connected to the tabs of the electrode assembly 3 through the electrical connection assembly 5; and exemplarily, the electrode terminal 4A of one of the end caps 4 is connected to the tab of the electrode assembly 3 through the electrical connection assembly 5, and the electrode terminal 4A of the other end cap 4 can be directly electrically connected to the tab of the electrode assembly 3.

[0108] Optionally, in the cylindrical battery, the electrical connection assembly 5 can be connected only to the positive tab or only to the negative tab. Of course, in the cylindrical battery, two electrical connection assemblies 5 can be provided to be respectively connected to the positive tab and the negative tab. The present application does not make any limitation thereto.

[0109] Optionally, the electrical connection assembly 5 can be received in the housing 2 by means of local folding, bending, etc. The present application does not make any limitation thereto.

[0110] Since the battery cell 1 includes a cylindrical battery, the electrical connection assembly 5 connecting the electrode terminal 4A and the electrode assembly 3 can be received in the housing 2, improving the assembly efficiency and reliability of the cylindrical battery.

[0111] In an embodiment of the present application, the recessed portion is provided on the adapter laminate 7, and the protruding portion 9 is provided on the current collector 6. The recessed portion and the protruding portion 9 cooperate to engage the adapter laminate 7 and the current collector 6.

[0112] Optionally, the recessed portion may be in the form of a hole or a groove. The recessed portion and the protruding portion 9 cooperate to fix the adapter laminate 7 and the current collector 6.

[0113] Alternatively, the protruding portion 9 may be a convex structure such as a convex portion, a pin, a hook claw, a ratchet claw, etc. provided on the current collector 6, which can cooperate with the recessed portion to form a locking structure 8. Further optionally, the protruding portion 9 may be a local protruding structure of the current collector 6.

[0114] Optionally, the number of the protruding portions 9 may be one or more, and the number of the recessed portions may be one or more. The number of the protruding portions 9 and the recessed portions may be the same or different. The plurality of protruding portions 9 or recessed portions may be arranged in an array, or may be arranged in a suitable arrangement according to the shape of the adapter laminate 7 or the current collector 6.

[0115] Optionally, a plurality of protruding portions 9 may be engaged with one recessed portion to enhance the fixing effect of the locking structure 8.

[0116] Since the protruding portion 9 and the recessed portion can cooperate to be fixed, the adapter laminate 7 and the current collector 6 can be engaged and connected through a simple structure, strengthening the fixing effect of the adapter laminate 7 and the current collector 6, and reducing the risk of separation and detachment of the two.

[0117] In an embodiment of the present application, as Figure 4 shown, the recessed portion includes a through hole 10 into which the protruding portion 9 can be inserted, and the through hole 10 is provided on the adapter laminate 7.

[0118] Optionally, the through hole 10 may be a circular hole, an oval hole, a triangular hole, a square hole or a hole of other polygons. Optionally, when observed in the first direction (Z direction), the shape of the protruding portion 9 may be the same as that of the through hole 10. The protruding portion 9 may be engaged with the through hole 10 by interference fit or clearance fit. Specifically, the protruding portion 9 may be a triangular prism shape, a cuboid shape, etc.

[0119] Alternatively, when observed in the first direction (Z direction), the shape of the protruding portion 9 may not be the same as that of the through hole 10. The protruding portion 9 may be engaged with the through hole 10 through a fastener, a claw, etc.

[0120] The through hole 10 engages with the convex portion 9, which to a certain extent prevents the convex portion 9 from detaching from the through hole 10, and further to a certain extent prevents the current collector 6 provided with the convex portion 9 from detaching from the adapter laminate 7 provided with the through hole 10. In addition, since the recessed portion can be the through hole 10, it can not only facilitate the insertion of the convex portion 9 but also play a role in precise positioning, effectively fixing the relative positions of the two.

[0121] In an embodiment of the present application, as Figure 4 、 Figure 5 shown, the convex portion 9 includes a through portion 9A located in the through hole 10 and a bent portion 9B connected to the through portion 9A; the bent portion 9B is configured to be in a bent state with respect to the through portion 9A; along the first direction, a part of the adapter laminate 7 is located between the bent portion 9B and the current collector 6, and the first direction is the thickness direction of the adapter laminate 7.

[0122] Optionally, the bent portion 9B can be bent with respect to the through portion 9A in multiple directions to be in a bent state, including but not limited to approaching the side where the current collector 6 is located along the second direction (X direction) or moving away from the side where the current collector 6 is located along the second direction (X direction); when observed along the first direction, the shape of the bent portion 9B is not limited to a rectangle, and can also be a square, trapezoid, triangle, semicircle, etc.

[0123] Alternatively, the bent portion 9B can also be bent along the third direction (Y direction). Of course, although other directions are not mentioned, they can also be the bending directions of the bent portion 9B.

[0124] Optionally, although not shown, one convex portion 9 can have multiple through portions and bent portions, and the multiple through portions and bent portions can respectively engage with the through holes.

[0125] In the bent state, a part of the adapter laminate 7 is located between the bent portion 9B and the current collector 6, which can effectively limit the relative movement of the adapter laminate 7 and the current collector 6 in the first direction and further fix their relative positions.

[0126] Since the convex portion 9 has the bent portion 9B, the fixed connection between the adapter laminate 7 and the current collector 6 can be further enhanced, reducing the risk of their separation and detachment. In addition, the bent portion 9B can be in a bent state, which to a certain extent avoids the interference of the bent portion 9B with other components in the battery cell 1, and also reduces the impact on the folding and storage of the electrical connection assembly 5 in the housing 2, improving the compactness of the layout of the battery cell 1.

[0127] In a specific embodiment, as Figure 5 、 Figure 7 shown, the adapter laminate 7 has a first end 7A connected to the current collector 6 and a second end 7B connected to the end cap 4, and the bent portion 9B is bent toward the side where the first end 7A is located.

[0128] In a specific embodiment, the first end 7A is in contact with and fixed to the current collector 6, and the second end 7B can be connected to the electrode terminal 4A.

[0129] Exemplarily, the adapter laminate 7 can be provided with a terminal connection hole 15 at the second end 7B. Passing the electrode terminal 4A through the connection hole can achieve the electrical connection between the electrode terminal 4A and the adapter laminate 7. Furthermore, through the electrical connection component 5, the electrical connection between the electrode terminal 4A and the electrode component 3 can be achieved, so that external power supply can be performed through the electrode terminal 4A. At the same time, the setting of the terminal connection hole 15 can effectively fix the electrode terminal 4A.

[0130] Also exemplarily, the electrode terminal 4A can be connected and fixed to the adapter laminate 7 by welding.

[0131] Optionally, although not shown, the adapter laminate 7 can also be provided with reinforcing ribs to enhance the strength of the adapter laminate 7, facilitating bending at other parts without reinforcing ribs, so that the adapter laminate 7 can be more easily stored in the housing 2 by folding.

[0132] Thus, the direction in which the bent portion 9B is bent can further increase the constraint reaction force of the engaging structure 8, enhance the engaging effect of the engaging structure 8, limit the separation of the adapter laminate 7 from the current collector 6, and reduce the risk of the adapter laminate 7 separating and falling off from the current collector 6.

[0133] In the embodiment of the present application, the through hole 10 is an elongated hole. Along the third direction perpendicular to the first direction and the second direction, the length L1 of the through hole 10 is not less than the length L2 of the protrusion 9 along the third direction.

[0134] Optionally, the through hole 10 can be an oval hole or a rectangular hole (rectangular aperture).

[0135] Exemplarily, as Figure 7 shown, the through hole 10 is a rectangular hole. The long edge or short edge of the through hole 10 is parallel to the second direction (X direction).

[0136] Also exemplarily, as Figure 7 shown, the through hole 10 is a rectangular hole, having a longer first edge 10A and a shorter second edge 10B, where the second edge 10B is parallel to the second direction (X direction). This is beneficial for the bent portion 9B to hinder the relative movement between the adapter laminate 7 and the current collector 6 along the second direction (X direction) in the bent state, further enhancing the constraint reaction force and the engaging effect, and reducing the risk of the adapter laminate 7 separating and falling off from the current collector 6.

[0137] When viewed along the first direction, the shape of the through portion 9A may be the same as or different from the shape of the through hole 10 , and this application does not limit this.

[0138] For example, Figure 7 , Figure 8 As shown, along the third direction (Y direction), the length L1 of the first edge 10A is not less than the length L2 of the protrusion 9 , so that the protrusion 9 can be easily inserted into the through hole 10 .

[0139] In other embodiments, Figure 7 , Figure 8 As shown, along the second direction (X direction), the length D1 of the second edge 10B is also not less than the thickness D2 of the protrusion 9 , so that the protrusion 9 can be easily inserted into the through hole 10 .

[0140] This facilitates the insertion of the protrusion 9 into the through hole 10 , improves the positioning effect, and further reduces the difficulty of assembling the adapter stack 7 and the current collecting member 6 .

[0141] In a specific embodiment, along the third direction (Y direction), the difference between the length L1 of the through hole 10 and the length L2 of the protrusion 9 is 1 mm.

[0142] Therefore, the length of the through hole 10 can achieve a precise positioning effect, and can also prevent the adapter stack 7 and the current collecting member 6 from moving relative to each other along the third direction (Y direction) to a certain extent, further enhancing the engagement effect.

[0143] In an embodiment of the present application, the current collecting member 6 has a first surface 11 on the side facing the adapter stack 7, and has a second surface 12 on the side facing away from the adapter stack 7, and the protrusion 9 extends from the second surface 12 and protrudes from the first surface 11; the bent portion 9B is bent in the second direction relative to the through portion 9A, and the total length H4 of the protrusion 9 is the sum of the length H3 of the through portion 9A along the first direction from the second surface 12 and the length H2 of the bent portion 9B along the second direction, the length H3 of the through portion 9A along the first direction from the second surface 12 is the sum of the thickness D of the adapter stack 7 and the thickness D3 of the current collecting member 6, and the length of the bent portion 9B along the second direction is not less than 4 mm, and does not exceed the minimum distance between the edge of the through hole 10 and the first end 7A.

[0144] For example, Figure 3 , Figure 8 As shown, the current collector 6 has a first surface 11 and a second surface 12 . The first surface 11 is located on the side where the adapter stack 7 is located, and is engaged and fixed with the adapter stack 7 . The second surface 12 is connected to the electrode assembly 3 .

[0145] Optionally, the current collector 6 is provided with a groove 6B and a positioning hole 6A. One or more grooves 6B can be provided. When observed in the first direction (Z direction), the shape of the groove 6B can be arc-shaped or zigzag-shaped.

[0146] Exemplarily, as Figure 8 shown, the current collector 6 is provided with two zigzag grooves 6B. The positions where the grooves 6B are located protrude from the second surface 12 and are connected to the electrode assembly 3, which is beneficial for subsequent welding and fixing.

[0147] Optionally, one or more positioning holes 6A can be provided, and the present application does not limit the shape and layout of the positioning holes 6A.

[0148] Exemplarily, the positioning hole 6A can communicate with a pressure relief component (not shown) of the end cap 4, which is beneficial for the battery cell 1 to relieve pressure during thermal runaway.

[0149] Another exemplarily, the positioning hole 6A can also communicate with a liquid injection hole (not shown) of the end cap 4, which can accelerate the flow of the electrolyte to the electrode assembly 3 and make liquid injection easier.

[0150] Still another exemplarily, the position of the positioning hole 6A can also correspond to the winding center hole (not shown) of the electrode assembly 3, which is convenient for the positioning and installation of the electrical connection assembly 5.

[0151] Exemplarily, as Figure 5 、 Figure 8 shown, the total length H4 of the protrusion 9 is the sum of the length H3 of the through portion 9A along the first direction (Z direction) starting from the second surface 12 and the length H2 of the bent portion 9B along the second direction (X direction).

[0152] Another exemplarily, the length H3 of the through portion 9A along the first direction (Z direction) starting from the second surface 12 is the sum of the thickness D of the adapter laminate 7 and the thickness D3 of the current collector 6. The through portion 9A extends from the second surface 12 and protrudes from the first surface 11, and needs to pass through the current collector 6 and the adapter laminate 7. Optionally, the protrusion 9 can be formed by shearing the current collector 6 and then folding it, or can be formed by additionally setting it on the second surface 12. During processing, exemplarily, two parallel slits can be cut on the current collector 6 by a shearing device, and then the local part of the current collector 6 between the two slits is bent upward Figure 8 as shown in, thereby forming the protrusion 9.

[0153] Exemplarily, as Figure 7 、 Figure 8As shown, the through-hole 10 has a first edge 10A, and the distance between the first edge 10A and the first end 7A is H1, where H1 is the minimum distance between the edge of the through-hole 10 and the first end 7A. The length H2 of the bent portion 9B is not less than 4 mm and does not exceed the minimum distance H1 between the edge of the through-hole 10 and the first end 7A.

[0154] Since the length of the bent portion 9B is within a suitable range, when the bent portion 9B of the protruding portion 9 is in a bent state, the bent portion 9B with a suitable length can achieve a good clamping effect. The bent portion 9B will not protrude beyond the first end 7A to scratch other components, and it can also reduce the production cost and processing difficulty. In addition, the length of the through portion 9A can also make it easy for the through portion 9A to pass through the through-hole 10, facilitating the bending of the bent portion 9B.

[0155] In the embodiment of the present application, the thickness D2 of the protruding portion 9 is the same as the thickness D3 of the current collector 6.

[0156] Exemplarily, as Figure 8 shown, along the second direction (X direction), the thickness of the protruding portion 9 is D2. Along the first direction (Z direction), the thickness of the current collector 6 is D3. The thickness D2 of the protruding portion 9 is the same as the thickness D3 of the current collector 6.

[0157] Since the thickness D2 of the protruding portion 9 is the same as the thickness D3 of the current collector 6, the current-carrying capacity of the current collector 6 can be improved while reducing the processing difficulty of the current collector 6.

[0158] In a specific embodiment, as Figure 8 shown, the current collector 6 has a notch 6C. The protruding portion 9 and the current collector 6 are an integral part, and one end of the protruding portion 9 is connected to the edge of the notch 6C in the second direction.

[0159] Exemplarily, the protruding portion 9 and the current collector 6 are an integral part. The protruding portion 9 can be formed by folding a local part of the current collector 6 at the notch 6C, so that the through portion 9A in the protruding portion 9 is connected to the edge of the notch 6C in the second direction, and the protruding portion 9 extends from the second surface 12 and protrudes from the first surface 11.

[0160] This can improve the current-carrying capacity of the current collector 6 while reducing the processing difficulty of the current collector 6.

[0161] In a specific embodiment, the length H2 of the bent portion 9B in the second direction is 45% to 55% of the minimum distance H1 between the edge of the through-hole 10 and the first end 7A.

[0162] Optionally, the length H2 of the bent portion 9B in the second direction can be 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55% of H1.

[0163] Exemplarily, the length H2 of the bent portion 9B along the second direction may be 50% of H1. After bending, a good engaging effect is achieved.

[0164] Thus, the length of the bent portion 9B is within a suitable range, and the length H2 of the bent portion 9B can further balance the engaging effect of the engaging structure 8 and the current-carrying effect of the electrical connection component 5, and can also control the production cost.

[0165] In a specific embodiment, the adapter laminate 7 and the current collector 6 are fixedly welded together.

[0166] Exemplarily, as Figure 5 shown, the adapter laminate 7 is provided with a welding area 14, and the adapter laminate 7 is fixedly welded after being engaged with the current collector 6.

[0167] Optionally, although not shown, a plurality of sub-welding areas 14 may be provided in the welding area 14, and the present application does not limit the number, shape, and arrangement of the sub-welding areas 14.

[0168] Optionally, the engaging structure 8 may be provided in the welding area 14 or in a part outside the welding area 14, and the present application does not limit this.

[0169] Optionally, the welding method may be ultrasonic welding, which has the characteristics of high welding efficiency and low welding cost.

[0170] Optionally, the welding method may be direct full welding, or pre-welding may be performed on some contact parts first, and then full welding is performed on all contact parts.

[0171] Since the adapter laminate 7 and the current collector 6 are fixedly connected by welding when in the engaged state, the stability of the connection between the two can be further improved, the resistance of the electrical connection component 5 can be reduced, and the current-carrying capacity of the electrical connection component 5 is enhanced.

[0172] The second aspect of the embodiments of the present application provides a battery 100, including a box body 101 and at least one battery cell 1 of the first aspect of the embodiments of the present application accommodated in the box body 101. As Figure 2 shown, the box body 101 may include a cover body 102 and a lower box body 103.

[0173] Since the battery 100 includes the battery cell 1 disclosed in the first aspect of the embodiments of the present application, the risk of the electrical connection component 5 separating and falling off during assembly can be reduced, and thus the assembly efficiency and reliability of the battery 100 can be improved.

[0174] The third aspect of the embodiments of the present application provides an electrical device, which includes the battery cell 1 of the first aspect of the embodiments of the present application or the battery 100 of the second aspect of the embodiments of the present application for providing electrical energy.

[0175] Since the electrical device includes the battery cell 1 disclosed in the first aspect of the embodiments of the present application or the battery 100 disclosed in the second aspect of the embodiments of the present application, the assembly efficiency and reliability of the battery 100 can be improved, and further the assembly efficiency and reliability of the electrical device can be enhanced.

[0176] The specific embodiments of the present application will be described below with reference to the accompanying drawings.

[0177] To prevent, to a certain extent, the problem that the adapter laminate 7 and the current collector fall off during the production process of the battery cell after virtual soldering. The present application provides a battery cell 1, and a physical fixing and welding fixing scheme is adopted to reinforce the adapter laminate 7 and the current collector 6 in the battery cell 1.

[0178] A rectangular through hole 10 is opened at the end of a single adapter 13 (the welding area 14 with the current collector 6), and n single adapters 13 are stacked into an adapter laminate 7.

[0179] Among them, the thickness of a single adapter 13 is d, there are n layers of adapters 13 in total, and the thickness of the adapter laminate 7 is D, D = n * d. L1 is the length of the first edge 10A of the through hole 10; D1 is the length of the second edge 10B of the through hole 10; H1 is the minimum distance of the through hole 10 from the first end 7A.

[0180] A convex portion 9 is provided at the first end 7A of the second surface 12 of the current collector 6, and the convex direction is along the first direction towards the side where the end cover 4 is located. The convex portion 9 can be formed by shearing and then folding the current collector 6. The thickness D2 of the convex portion 9 is equal to the thickness D3 of the current collector 6; the full length of the convex portion 9 is H4, H4 = D + D3 + 1 / 2 * H1, so that the convex portion 9 can be bent again after being fitted with the adapter laminate 7; along the second direction, the width of the convex portion 9 is L2, L2 (mm) = L1 - 1, so that the convex portion 9 can be fitted with the through hole 10 passing through it.

[0181] After the adapter laminate 7 and the current collector 6 are assembled, the bent portion 9B of the convex portion 9 is bent, and the bending direction is towards the first end 7A. The bending presses the adapter laminate 7 and the current collector 6 tightly and fixes them. Then, the overlapping area (welding area 14) of the adapter laminate 7 and the current collector 6 is subjected to ultrasonic welding to play a role of secondary fixing.

[0182] Since a physical reinforcement scheme is added to the original connection scheme of the adapter 13 and the current collector 6 by ultrasonic welding, the problem that the adapter 13 and the current collector 6 fall off due to virtual soldering during the production and assembly process of the battery cell 1 is prevented to a certain extent.

[0183] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, It includes a housing, an end cap, an electrode assembly, and an electrical connection assembly. The electrode assembly is accommodated in the housing, and the end cap is provided with electrode terminals; The electrode terminals and the electrode assembly are electrically connected through the electrical connection assembly; The electrical connection assembly includes a current collector and at least one adapter connected to the current collector, and the adapter is snap-connected to the current collector.

2. The battery cell according to claim 1, wherein, The number of the adapters is multiple, and they are stacked to form an adapter stack, and the adapter stack is snap-connected to the current collector.

3. The battery cell according to claim 2, wherein, A recess is provided in the adapter stack, and a protrusion is provided on the current collector. The recess and the protrusion cooperate to snap the adapter stack to the current collector.

4. The battery cell according to claim 3, wherein, The recess includes a through hole into which the protrusion can be inserted, and the through hole is provided in the adapter stack.

5. The battery cell according to claim 4, wherein, The protrusion includes a through portion located in the through hole and a bent portion connected to the through portion; the bent portion is in a bent state relative to the through portion; Along a first direction, a part of the adapter stack is located between the bent portion and the current collector, and the first direction is the layer thickness direction of the adapter stack.

6. The battery cell according to claim 5, wherein, The adapter stack has a first end connected to the current collector and a second end connected to the end cap, and the bent portion bends toward the side where the first end is located.

7. The battery cell according to claim 6, wherein, Along the first direction, the current collector has a first surface facing the side where the adapter stack is located, and a second surface facing away from the side where the adapter stack is located. The protrusion extends from the second surface and protrudes from the first surface; The bent portion bends in a second direction relative to the through portion, The total length of the protrusion is the sum of the length of the through portion extending along the first direction from the second surface and the length of the bent portion along the second direction, The length of the through portion extending along the first direction from the second surface is the sum of the thickness of the adapter stack and the thickness of the current collector, The length of the bent portion along the second direction is not less than 4 mm and does not exceed the minimum distance between the edge of the through hole and the first end.

8. The battery cell according to claim 7, wherein, The length of the bent portion along the second direction is 45% to 55% of the minimum distance between the edge of the through hole and the first end.

9. The battery cell according to claim 7, wherein, The thickness of the protrusion is the same as the thickness of the current collector.

10. The battery cell according to claim 9, wherein, The current collector has a notch, the protrusion and the current collector form an integral part, and one end of the protrusion is connected to the edge of the notch in the second direction.

11. The battery cell according to claim 7, wherein the through hole is an elongated hole; in a third direction perpendicular to the first direction and the second direction, the length of the through hole is not less than the length of the convex portion in the third direction.

12. The battery cell according to claim 11, wherein in the third direction, the difference between the length of the through hole and the length of the convex portion is 1 mm.

13. The battery cell according to any one of claims 2 to 11, wherein the number of the adapter members included in the adapter member laminate is any natural number from 2 to 10.

14. The battery cell according to any one of claims 2 to 12, characterized in that, The adapter member laminate is fixedly welded to the current collector.

15. The battery cell according to claim 13, characterized in that, The adapter member laminate is fixedly welded to the current collector.

16. The battery cell according to any one of claims 1 to 12 and 15, characterized in that, The battery cell includes a cylindrical battery.

17. The battery cell according to claim 13, characterized in that, The battery cell includes a cylindrical battery.

18. A battery, characterized in that, It includes a box body and at least one battery cell according to any one of claims 1 to 17 accommodated in the box body.

19. An electrical device, characterized in that, The electrical device includes the battery cell according to any one of claims 1 to 17 for providing electrical energy or the battery according to claim 18.

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