Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, the battery monomer comprises a shell, an electrode assembly, an electrode terminal and a current collector, the electrode assembly is arranged in an accommodating cavity of the shell, a tab of the electrode assembly extends out of an electrode main body along a first direction, and the electrode terminal is arranged on the shell. The current collecting piece comprises a first current collecting structure and a second current collecting structure, the first current collecting structure is located on one side of the electrode main body in the first direction, a thinning part in the first current collecting structure is thinned relative to a main body part, the main body part is electrically connected to the electrode terminal, and the second current collecting structure is connected to the thinning part and the tab. The thinning part is thinned relative to the main body part, the structural strength of the thinning part is lower than that of the main body part, and the thinning part is easier to deform, so that the thinning part can buffer the transmission of external force borne by the second current collecting structure to the main body part through deformation, the deformation of the first current collecting structure is reduced, and the connection reliability of other components of the current collecting part is improved; and the reliability of the battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a battery cell, a battery and an electrical device. Background Art

[0002] Batteries have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation means, such as mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships and electric tools, etc.

[0003] With the increasingly wide application range of batteries, how to improve the reliability of batteries has attracted more and more attention from those skilled in the art. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, and the battery cell is beneficial to improving the reliability of the battery.

[0005] In a first aspect, some embodiments of the present application provide a battery cell, which includes a housing, an electrode assembly, an electrode terminal and a current collector. The housing has a receiving cavity; the electrode assembly is disposed in the receiving cavity, and the electrode assembly includes an electrode body and a tab extending from an end of the electrode body in a first direction; the electrode terminal is disposed on the housing; the current collector includes a first current collecting structure and a second current collecting structure. The first current collecting structure is located on one side of the electrode body in the first direction. The first current collecting structure includes a connected main body portion and a thinning portion. The thinning portion is thinner than the main body portion. The main body portion is electrically connected to the electrode terminal, and the second current collecting structure is connected to the thinning portion and the tab.

[0006] In the above structure, since the thinning portion is thinner than the main body portion, the structural strength of the thinning portion is lower than that of the main body portion, and it is more likely to deform, so that the thinning portion can buffer the transmission of the external force received by the second current collecting structure to the main body portion through deformation, which is beneficial to reducing the deformation of the first current collecting structure and improving the reliability of the connection of other components of the current collector, and thus is beneficial to improving the reliability of the battery.

[0007] According to the battery cell provided by some embodiments of the present application, the thinning portion is recessed inward relative to the main body portion, so that the thickness of the thinning portion is smaller than that of the main body portion.

[0008] According to the battery cell provided by some embodiments of the present application, at least a part of the thinning portion extends from an end of the main body portion in a second direction, and the second direction is perpendicular to the first direction. By making at least a part of the thinning portion extend from an end of the main body portion in the second direction, the area of the thinning portion can be enlarged, which is beneficial to improving the ability of the thinning portion to buffer the external force transmitted by the second current collecting structure.

[0009] According to the battery cell provided by some embodiments of the present application, the thinning portion extends to the edge of the first current collector structure in the second direction, and the second direction is perpendicular to the first direction; the second current collector structure is connected to the end face of the thinning portion in the second direction, so that the second current collector structure is connected to the portion with lower strength of the thinning portion. When the force received by the second current collector structure is transmitted to the thinning portion, the thinning portion is more likely to deform to buffer the force, which is beneficial to reducing the deformation of the first current collector structure.

[0010] According to the battery cell provided by some embodiments of the present application, the second current collector structure includes a first connection portion and a second connection portion connected to each other. The first connection portion is connected to the thinning portion, and the second connection portion is connected to the tab.

[0011] According to the battery cell provided by some embodiments of the present application, the first connection portion is welded to the main body portion, and a first welding portion is formed between the first connection portion and the main body portion. The first welding portion is arranged along the outer periphery of the first connection portion, which is not only beneficial to improving the connection strength between the first connection portion and the first current collector structure, but also beneficial to improving the current-carrying capacity between the first connection portion and the first current collector structure, and helps to reduce the internal resistance of the battery cell.

[0012] According to the battery cell provided by some embodiments of the present application, the second connection portion includes a bending structure and an extending structure. The extending structure is bent relative to the first direction and connected to the tab. The extending structure is connected to the first connection portion through the bending structure. By bending the extending structure relative to the first direction, the extending structure can be stacked on one side of the first connection portion in the first direction, which is beneficial to reducing the space occupied by the second current collector structure in the first direction.

[0013] According to the battery cell provided by some embodiments of the present application, at least part of the extending structure is located on the side of the first connection portion away from the thinning portion, and the tab is connected to the side of the extending structure away from the first connection portion, so that the tab, the extending structure, the first connection portion and the thinning portion can be stacked in the first direction, which facilitates the arrangement of the tab, the first current collector member, the first current collector structure and the second current collector structure.

[0014] According to the battery cell provided by some embodiments of the present application, the side surface of the first connection portion facing away from the thinning portion does not protrude from the side surface of the main body portion, which can reduce the space occupied by the first connection portion in the first direction and is beneficial to improving the structural compactness of the battery cell.

[0015] According to the battery cell provided by some embodiments of the present application, the current collector is an integrally formed structure.

[0016] According to the battery cell provided by some embodiments of the present application, there are a plurality of second current collector structures, and the plurality of second current collector structures are arranged at intervals, so that a plurality of tabs can be electrically connected to the current collector through the connection with the plurality of second current collector structures respectively.

[0017] In a second aspect, some embodiments of the present application provide a battery, which includes the battery cell provided by any of the above technical solutions.

[0018] In a second aspect, some embodiments of the present application provide an electrical device, which includes the battery provided by the above technical solution, and the battery is used to provide electrical energy.

[0019] The technical solutions provided by the embodiments of the present disclosure at least bring the following beneficial effects:

[0020] Some embodiments of the present application provide a battery cell, a battery and an electrical device. The battery cell includes a housing, an electrode assembly, an electrode terminal and a current collector. The electrode assembly is disposed in the accommodation cavity of the housing. The tab of the electrode assembly extends from the electrode body in a first direction. The electrode terminal is disposed on the housing. The current collector includes a first current collecting structure and a second current collecting structure. The first current collecting structure is located on one side of the electrode body along the first direction. The thinning part in the first current collecting structure is thinner than the main body part. The main body part is electrically connected to the electrode terminal. The second current collecting structure is connected to the thinning part and the tab. In the above structure, since the thinning part is thinner than the main body part, the structural strength of the thinning part is lower than that of the main body part and is more likely to deform. The thinning part can buffer the transfer of the external force received by the second current collecting structure to the main body part through deformation, which is beneficial to reducing the deformation of the first current collecting structure and improving the reliability of the connection of other components of the current collector, and thus is beneficial to improving the reliability of the battery.

[0021] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specific embodiments of the present application are specifically given. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 the present application. And throughout the drawings, the same reference numerals are used to represent the same components.

[0023] Figure 1 Schematic diagram of the structure of a vehicle provided by some embodiments of the present application;

[0024] Figure 2 Exploded view of a battery provided by some embodiments of the present application;

[0025] Figure 3 Exploded view of a battery cell provided by some embodiments of the present application;

[0026] Figure 4 Schematic structural diagram of the current collector provided by some embodiments of the present application;

[0027] Figure 5 Schematic structural diagram of the first current collection structure and the second current collection structure of the current collector provided by some embodiments of the present application after being split;

[0028] Figure 6 Schematic structural diagram of the current collector provided by some other embodiments of the present application;

[0029] Figure 7 Schematic structural diagram of the first current collection structure and the second current collection structure of the current collector provided by some other embodiments of the present application after being split;

[0030] Figure 8 Schematic structural diagram of the first current collection structure and the second current collection structure of the current collector provided by some further embodiments of the present application after being split;

[0031] Figure 9 Schematic structural diagram of the first current collection structure and the second current collection structure of the current collector provided by some other embodiments of the present application after being split;

[0032] Figure 10 Schematic structural diagram of the first current collection structure and the second current collection structure of the current collector provided by some embodiments of the present application after being welded.

[0033] In the drawings:

[0034] 1. Housing; 2. Electrode assembly; 21. Electrode body; 22. Tab; 3. Accommodation cavity; 4. Current collector; 41. First current collection structure; 411. Main body part; 412. Thinning part; 42. Second current collection structure; 421. First connection part; 422. Second connection part; 4221. Bending structure; 42211. Weak structure; 4222. Extension structure; 5. First welding part; 6. Electrode terminal; 1000. Vehicle; 100. Battery; 20. Battery cell; 200. Controller; 300. Motor; X. First direction; Y. Second direction. Detailed implementation manners

[0035] The embodiments of the technical solution of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0036] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those skilled in the art to which the embodiments of the present application belong.

[0037] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0038] In addition, the technical terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 specific circumstances.

[0040] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0041] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydraulic, thermal, wind and solar power stations, but also widely used in electric transportation means such as electric bicycles, electric motorcycles, electric vehicles, as well as in multiple fields such as military equipment and aerospace.

[0042] The battery mentioned in the embodiments of the present application includes one or more battery modules. A battery module refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

[0043] The battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging to continue use.

[0044] The battery cell can be an ion battery cell, which includes but is not limited to lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, magnesium-ion battery cells, and calcium-ion battery cells.

[0045] The battery cell generally includes an electrode assembly. The electrode assembly 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 extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes, and at the same time, the ion channels provided thereon can allow active ions to pass through.

[0046] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid.

[0047] In some embodiments, the electrode assembly is provided with tabs, and the tabs can lead the current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0048] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing 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, etc.

[0049] As an example, the battery cell 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 multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc.

[0050] The battery mentioned in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

[0051] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0052] In some embodiments, the battery can be a battery pack, and the battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0053] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can form at least part of the floor of the vehicle, or part of the box body can form at least part of the cross beams and longitudinal beams of the vehicle.

[0054] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage electric cabinet, etc.

[0055] The tab of the electrode assembly in the battery cell generally needs to be connected to the electrode terminal through a current collector. The current collector includes a first current collecting structure and a second current collecting structure connected by welding. In the prior art, the second current collecting structure usually needs to be bent. Under the transmission of force, this usually causes deformation of the first current collecting structure, reducing the reliability of the battery.

[0056] To improve the reliability of the battery, some embodiments of the present application provide a battery cell, which includes a housing, an electrode assembly, an electrode terminal, and a current collector. The electrode assembly is disposed in the accommodation cavity of the housing. The tab of the electrode assembly extends from the electrode body in a first direction. The electrode terminal is disposed on the housing. The current collector includes a first current collecting structure and a second current collecting structure. The first current collecting structure is located on one side of the electrode body in the first direction. The thinning portion in the first current collecting structure is thinned relative to the main body portion. The main body portion is electrically connected to the electrode terminal. The second current collecting structure is connected to the thinning portion and the tab. In the above structure, since the thinning portion is thinned relative to the main body portion, the structural strength of the thinning portion is lower than that of the main body portion and is more likely to deform. The thinning portion can buffer the transmission of the external force received by the second current collecting structure to the main body portion through deformation, which is beneficial to reducing the deformation of the first current collecting structure and improving the reliability of the connection of other components of the current collector, thereby improving the reliability of the battery.

[0057] The battery cell described in the embodiments of the present application is applicable to batteries and electrical devices using the batteries. The battery cell can be, but is not limited to, used in batteries, and can also be used in products such as vehicles, airplanes, ships, electronic devices, and power tools, etc., which can improve the reliability of these products.

[0058] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and a power tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy, etc.; the power tool includes a metal cutting power tool, a grinding power tool, an assembly power tool, and a railway power tool, for example, a drill, an electric grinder, an electric wrench, an electric screwdriver, a hammer drill, an impact drill, a concrete vibrator, and a planer, etc.

[0059] For the convenience of description, in the following embodiments, a power-consuming device in an embodiment of the present application is taken as an example of a vehicle 1000 for description.

[0060] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000, and 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 be used 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, navigation, and driving of the vehicle 1000.

[0061] In some embodiments of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also 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.

[0062] Please refer to Figure 2 , Figure 2 , which is an exploded view of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 10 and battery cells 20, and the battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20. There can be multiple battery cells 20 in the battery 100, and the multiple battery cells 20 can be connected in series, parallel, or in a series-parallel combination. The series-parallel combination means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, parallel, or in a series-parallel combination together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery 100 can also be in the form that multiple battery cells 20 are first connected in series, parallel, or in a series-parallel combination to form battery modules, and then the multiple battery modules are connected in series, parallel, or in a series-parallel combination to form a whole and are accommodated in the box body 10.

[0063] The box body 10 can include a first box body 101 and a second box body 102. The first box body 101 and the second box body 102 are covered with each other to define a placement space for accommodating the battery cells 20. The first box body 101 and the second box body 102 can be in various shapes, such as a cuboid, a cylinder, etc. The first box body 101 can be a hollow structure with one side open, and the second box body 102 can also be a hollow structure with one side open. The open side of the second box body 102 is covered on the open side of the first box body 101, then the box body 10 with a placement space is formed.

[0064] The battery 100 may further include other structures. For example, the battery 100 may further include a current collecting member for realizing electrical connection between multiple battery cells 20.

[0065] In some embodiments of the present application, as Figure 3 shown, the battery cell 20 includes a housing 1, an electrode assembly 2, an electrode terminal 6, and a current collector 4. The housing 1 has a receiving cavity 3, and the electrode assembly 2 is disposed in the receiving cavity 3. The electrode assembly 2 includes an electrode body 21 and a tab 22 extending from an end of the electrode body 21 along a first direction X; the electrode terminal 6 is disposed on the housing 1. Refer to Figure 4 and Figure 5 , the current collector 4 includes a first current collecting structure 41 and a second current collecting structure 42. The first current collecting structure 41 is located on one side of the electrode body 21 along the first direction X. The first current collecting structure 41 includes a connected main body portion 411 and a thinning portion 412. The thinning portion 412 is thinner than the main body portion 411. The main body portion 411 is electrically connected to the electrode terminal 6, and the second current collecting structure 42 is connected to the thinning portion 412 and the tab 22.

[0066] The housing 1 may be a wall structure disposed on the outer periphery of the battery cell 20, which can form a receiving cavity 3 for receiving other components of the battery cell 20 such as the electrode assembly 2 and an electrolyte, and can protect other components of the battery cell 20 such as the electrode assembly 2.

[0067] The electrode assembly 2 is disposed in the receiving cavity 3 and can contact the electrolyte in the receiving cavity 3. The electrode body 21 may be the main structure in the electrode assembly 2, and the tab 22 may extend from an end of the electrode body 21 along the first direction X so as to be connected to other components in the battery cell 20.

[0068] The electrode terminal 6, as a component disposed on the housing 1, can be used for electrically connecting to an electrical device or a charging device outside the battery cell 20 so that the battery cell 20 can be charged and discharged. The electrode terminal 6 may include, but is not limited to, a columnar structure, and those skilled in the art can set it according to actual situations.

[0069] The current collector 4 may be a member for connecting the electrode terminal 6 and the tab 22. The first current collecting structure 41 and the second current collecting structure 42 are two mutually connected structural parts in the current collector 4. Among them, the first current collecting structure 41 is connected to the electrode terminal 6, and the second current collecting structure 42 is connected to the tab 22. Exemplarily, a plurality of tabs 22 extending from an end of the electrode body 21 along the first direction X are provided, and the second current collecting structure 42 is connected to the plurality of tabs 22.

[0070] The main body part 411 can be the main structure in the first current collector structure 41. The thinning part 412 can be a partial structure in the first current collector structure 41 that is connected to the main body part 411, and its thickness is thinner than that of the main body part 411 and is connected to the tab 22. By disposing the first current collector structure 41 on one side of the electrode main body 21 along the first direction X, the thinning part 412 connected to the main body part 411 can be located on one side of the electrode main body 21 along the first direction X, so that the second current collector structure 42 connected to the thinning part 412 can be located on one side of the electrode main body 21 along the first direction X, so that the second current collector structure 42 can be connected to the tab 22.

[0071] Exemplarily, the second current collector structure 42 can be connected to the thinning part 412 of the first current collector structure 41 by welding, or can be formed synchronously with the first current collector structure 41 by an integral forming process such as stamping, or can also be formed by processing a blank by a material removal method such as milling or chemical etching.

[0072] In the above structure, by thinning the thinning part 412 relative to the main body part 411, the structural strength of the thinning part 412 is lower than that of the main body part 411, and it is more likely to deform, so that the thinning part 412 can buffer the transmission of the external force received by the second current collector structure 42 to the main body part 411 through deformation, which is beneficial to reducing the deformation of the first current collector structure 41 and improving the reliability of the connection between the current collector 4 and other components, thereby being beneficial to improving the reliability of the battery 100.

[0073] In some embodiments, the thinning part 412 is recessed inward relative to the main body part 411.

[0074] By making the thinning part 412 recessed inward relative to the main body part 411, the surface of the thinning part 412 is recessed inward relative to the surface of the main body part 411, so that the thickness of the thinning part 412 is less than that of the main body part 411.

[0075] Exemplarily, it can be that the surface of the thinning part 412 facing away from the electrode main body 21 along the first direction X is recessed inward relative to the main body part 411; it can also be that the surface of the thinning part 412 facing the electrode main body 21 along the first direction X is recessed inward relative to the main body part 411; or it can be that the thinning part 412 is recessed inward relative to the main body part 411 on both sides in the first direction X.

[0076] In some embodiments, continue to refer to Figure 6 and Figure 7 , at least a part of the thinning part 412 extends out from the end of the main body part 411 along the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0077] The second direction Y may refer to a direction perpendicular to the first direction X. By making at least part of the thinning portion 412 extend from the end of the main body portion 411 along the second direction Y, the area of the thinning portion 412 can be enlarged, which is beneficial to improving the ability of the thinning portion 412 to buffer the external force transmitted by the second current collector structure 42.

[0078] In some embodiments, with continued reference to Figure 4 and Figure 5 , the thinning portion 412 extends to the edge of the first current collector structure 41 along the second direction Y, and the second direction Y is perpendicular to the first direction X; the second current collector structure 42 is connected to the end face of the thinning portion 412 in the second direction Y.

[0079] The second direction Y may refer to a direction perpendicular to the first direction X. The thinning portion 412 extending to the edge of the first current collector structure 41 along the second direction Y may mean that the end face of the thinning portion 412 in the second direction Y is flush with the end face of the main body portion 411 in the second aspect, so that the thinning portion 412 can be formed by removing materials from some areas in the first current collector structure 41 by milling, chemical etching, etc., improving the integrity of the first current collector structure 41.

[0080] By connecting the second current collector structure 42 to the end face of the thinning portion 412 in the second direction Y, the second current collector structure 42 is connected to a portion with lower strength of the thinning portion 412. When the force received by the second current collector structure 42 is transmitted to the thinning portion 412, the thinning portion 412 is more likely to deform to buffer the force, which is beneficial to reducing the deformation of the first current collector structure 41.

[0081] In some embodiments, with reference to Figure 8 and Figure 9 , the second current collector structure 42 includes a first connection portion 421 and a second connection portion 422 that are connected to each other. The first connection portion 421 is connected to the thinning portion 412, and the second connection portion 422 is connected to the tab 22.

[0082] The first connection portion 421 and the second connection portion 422 are respectively different structural parts that are connected to each other in the second connection structure. Among them, the first connection portion 421 may refer to the portion connected to the thinning portion 412, and it may extend along the extension direction of the thinning portion 412, so that the first connection portion 421 has a larger connection area when connected to the thinning portion 412, which is beneficial to improving the firmness of the connection between the first connection portion 421 and the thinning portion 412. The second connection portion 422 may be the portion connected to the tab 22.

[0083] In some embodiments, the first connecting portion 421 and the second connecting portion 422 are integrally formed structures. The first connecting portion 421 and the second connecting portion 422 can be made by integrally forming processing methods such as stamping and bending, so that the second current collecting structure 42 can be integrally and synchronously manufactured, which not only makes the processing and manufacturing of the second current collecting structure 42 convenient, but also makes the overall structure of the second current collecting structure 42 have good strength.

[0084] In some embodiments, referring to Figure 10 , the first connecting portion 421 is welded to the main body portion 411, and a first welding portion 5 is formed between the first connecting portion 421 and the main body portion 411. The first welding portion 5 is disposed along the outer periphery of the first connecting portion 421.

[0085] The first connecting portion 421 is welded to the main body portion 411 in addition to being connected to the thinning portion 412, so that the first connecting portion 421 is firmly connected to the first current collecting structure 41. By welding the first connecting portion 421 to the main body portion 411, the materials of the first connecting portion 421 and the main body portion 411 can be melted together, which not only helps to improve the connection strength between the first connecting portion 421 and the first current collecting structure 41, but also helps to improve the current-carrying capacity between the first connecting portion 421 and the first current collecting structure 41, and contributes to reducing the internal resistance of the battery cell 20.

[0086] Exemplarily, the first connecting portion 421 and the main body portion 411 can be welded by butt welding, so that the welding quality between the first connecting portion 421 and the main body portion 411 can be judged by visual inspection.

[0087] The first welding portion 5 can be a structure formed after the materials of the first connecting portion 421 and the main body portion 411 are melted and cooled. The first welding portion 5 is formed between the outer wall surface of the main body portion 411 and the outer wall surface of the first connecting portion 421, and the first welding portion 5 can connect the first connecting portion 421 and the main body portion 411 well. By setting the first welding portion 5 to be disposed along the outer periphery of the first connecting portion 421, the first welding portion 5 extends along the outer edge of the first connecting portion 421, which is beneficial to improving the firmness of the connection between the first connecting portion 421 and the main body portion 411.

[0088] In some embodiments, the first connecting portion 421 can be bonded to the thinning portion 412 by conductive adhesive, so that the first connecting portion 421 and the first current collecting structure 41 can conduct electricity smoothly; the first connecting portion 421 can also be connected to the thinning portion 412 by welding, so that the first connecting portion 421 and the first current collecting structure 41 can conduct electricity smoothly and be firmly connected at the same time.

[0089] In some embodiments, the second connecting portion 422 includes a bending structure 4221 and an extending structure 4222. The extending structure 4222 is bent relative to the first direction X and is connected to the tab 22. The extending structure 4222 is connected to the first connecting portion 421 through the bending structure 4221.

[0090] The bending structure 4221 and the extending structure 4222 can be different parts of the second connecting portion 422. Among them, the extending structure 4222 is connected to the first connecting portion 421 through the bending structure 4221, and the tab 22 is connected to the extending structure 4222.

[0091] By bending the extending structure 4222 relative to the first direction X, the extending structure 4222 can be stacked on one side of the first connecting portion 421 in the first direction X, which is beneficial to reducing the space occupied by the second current collecting structure 42 in the first direction X.

[0092] Exemplarily, the second current collecting structure 42 is an integrally formed structure. The second current collecting structure 42 can be a component made by an integral forming process such as stamping, so that the second current collecting structure 42 has high processing efficiency and low processing cost.

[0093] Exemplarily, the bending structure 4221 is provided with a weak structure 42211.

[0094] The weak structure 42211 can be a structure formed by removing material on the bending structure 4221, and its thickness is smaller than that of other parts of the bending structure 4221, so that the structural strength of the weak structure 42211 is smaller than that of other parts of the bending structure 4221. By providing the weak structure 42211 on the bending structure 4221, the bending structure 4221 can be bent more easily along the weak structure 42211, so that the extending structure 4222 can be bent more easily relative to the first direction X.

[0095] In some embodiments, at least part of the extending structure 4222 is located on the side of the first connecting portion 421 away from the thinning portion 412, and the tab 22 is connected to the side of the extending structure 4222 away from the first connecting portion 421.

[0096] By bending the extending structure 4222 relative to the first direction X, at least part of the extending structure 4222 is located on the side of the first connecting portion 421 away from the thinning portion 412. By connecting the tab 22 to the side of the extending structure 4222 away from the first connecting portion 421, the tab 22, the extending structure 4222, the first connecting portion 421, and the thinning portion 412 can be stacked along the first direction X, facilitating the arrangement of the tab 22, the first current collecting member 4, the first current collecting structure 41, and the second current collecting structure 42.

[0097] In some embodiments, the side surface of the first connecting portion 421 facing away from the thinning portion 412 does not protrude beyond the side surface of the main body portion 411.

[0098] The side surface of the first connecting portion 421 facing away from the thinning portion 412 not protruding beyond the side surface of the main body portion 411 may mean that the side surface of the first connecting portion 421 facing away from the thinning portion 412 is flush with the side surface of the main body portion 411; alternatively, the side surface of the first connecting portion 421 facing away from the thinning portion 412 is located inside the side surface of the main body portion 411.

[0099] By setting the side surface of the first connecting portion 421 facing away from the thinning portion 412 to not protrude beyond the side surface of the main body portion 411, the occupied space of the first connecting portion 421 in the first direction X can be reduced, which is beneficial to improving the structural compactness of the battery cell 20.

[0100] In some embodiments, the current collector 4 is an integrally formed structure.

[0101] The current collector 4 being an integrally formed structure may refer to that the first current collecting structure 41 and the second current collecting structure 42 are synchronously formed by an integral forming process. The first current collecting structure 41 and the second current collecting structure 42 can be made by integral forming processing methods such as stamping, enabling the current collector 4 to be integrally and synchronously manufactured. This not only makes the processing and manufacturing of the current collector 4 convenient but also gives the overall structure of the current collector 4 good strength; the first current collecting structure 41 and the second current collecting structure 42 can be made by machining methods such as milling, by processing a whole blank, making the current collector 4 have a lower processing difficulty and processing cost.

[0102] In some embodiments, there are a plurality of second current collecting structures 42, and the plurality of second current collecting structures 42 are arranged at intervals.

[0103] By providing a plurality of second current collecting structures 42 arranged at intervals, the plurality of tab ears 22 can be electrically connected to the current collector 4 by respectively connecting to the plurality of second current collecting structures 42. Exemplarily, the plurality of second current collecting structures 42 are connected to the plurality of tab ears 22 in a one-to-one correspondence.

[0104] Some embodiments of the present application further provide a battery 100, which includes the battery cell 20 provided by the above technical solution.

[0105] Some embodiments of the present application further provide an electrical device, which includes the battery 100 provided by the above technical solution, and the battery 100 is used to provide electrical energy.

[0106] Some embodiments of the present application provide a battery cell 20, which includes a housing 1, an electrode assembly 2, an electrode terminal 6, and a current collector 4. The electrode assembly 2 is disposed in the accommodation cavity 3 of the housing 1. The tab 22 of the electrode assembly 2 extends from the electrode body 21 along the first direction X. The electrode terminal 6 is disposed on the housing 1. The current collector 4 includes a first current collecting structure 41 and a second current collecting structure 42. The first current collecting structure 41 is located on one side of the electrode body 21 along the first direction X. The thinning portion 412 in the first current collecting structure 41 is thinned relative to the main body portion 411. The main body portion 411 is electrically connected to the electrode terminal 6. The second connecting portion 422 of the second current collecting structure 42 includes an extending structure 4222 that is bent relative to the first direction X. The extending structure 4222 is connected to the first connecting portion 421 through a bending structure 4221. The first connecting portion 421 is connected to the thinning portion 412 and welded to the main body portion 411. In the above structure, since the thinning portion 412 is thinned relative to the main body portion 411, the structural strength of the thinning portion 412 is lower than that of the main body portion 411, and it is more likely to deform. This enables the thinning portion 412 to buffer the transfer of external force received by the second current collecting structure 42 to the main body portion 411 through deformation, which is beneficial to reducing the deformation of the first current collecting structure 41 and improving the reliability of the connection of other components of the current collector 4, thereby improving the reliability of the battery 100.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended 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 for some or all of the technical features. 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 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 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: include: A housing having a receiving cavity; An electrode assembly is disposed in the accommodating cavity, wherein the electrode assembly comprises an electrode body and an electrode ear extending from an end of the electrode body along a first direction; An electrode terminal, disposed on the housing; A current collecting part includes a first current collecting structure and a second current collecting structure, wherein the first current collecting structure is located on one side of the electrode body along the first direction, the first current collecting structure includes a connected main body portion and a thinned portion, the thinned portion is thinned relative to the main body portion, the main body portion is electrically connected to the electrode terminal, and the second current collecting structure is connected to the thinned portion and the electrode ear.

2. The battery cell according to claim 1, characterized in that: The thinned portion is recessed inwardly relative to the main body portion.

3. The battery cell according to claim 1, characterized in that: At least a portion of the thinned portion extends from an end portion of the main body along a second direction, and the second direction is perpendicular to the first direction.

4. The battery cell according to claim 2 or 3, characterized in that: The thinning portion extends to an edge of the first current collecting structure along a second direction, and the second direction is perpendicular to the first direction; the second current collecting structure is connected to an end surface of the thinning portion in the second direction.

5. The battery cell according to claim 1, characterized in that: The second current collecting structure includes a first connecting portion and a second connecting portion connected to each other, wherein the first connecting portion is connected to the thinned portion, and the second connecting portion is connected to the electrode tab.

6. The battery cell according to claim 5, characterized in that: The first connection portion is welded to the main body portion, a first welding portion is formed between the first connection portion and the main body portion, and the first welding portion is arranged along the outer circumference of the first connection portion.

7. The battery cell according to claim 5, characterized in that: The second connection portion includes a bending structure and an extension structure, the extension structure is bent relative to the first direction and connected to the tab, and the extension structure is connected to the first connection portion through the bending structure.

8. The battery cell according to claim 7, characterized in that: At least a portion of the extension structure is located on a side of the first connection portion away from the thinned portion, and the tab is connected to a side of the extension structure away from the first connection portion.

9. The battery cell according to claim 5, characterized in that: The side surface of the first connecting portion facing away from the thinned portion does not protrude beyond the side surface of the main body portion.

10. The battery cell according to claim 1, characterized in that: The current collecting member is an integrally formed structure.

11. The battery cell according to claim 1, characterized in that: There are a plurality of the second current collecting structures, and the plurality of the second current collecting structures are arranged at intervals.

12. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 11.

13. An electrical device, characterized in that: Comprising the battery of claim 12, the battery being used to provide electrical energy.

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