Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a battery monomer, a battery device and electric equipment, and the battery monomer comprises a shell assembly which comprises an electrode leading-out part used for inputting or outputting electric energy; the electrode assembly is accommodated in the shell assembly, the electrode assembly comprises a tab, and the tab and the electrode leading-out part are made of different materials; the current collecting assembly comprises a first connecting piece which is made of the same material as the electrode leading-out part and a second connecting piece which is made of the same material as the tab; wherein one of the first connecting piece and the second connecting piece is provided with a first concave part, the other one of the first connecting piece and the second connecting piece is at least partially embedded into the first concave part and is connected with the first concave part, and the first connecting piece and the second connecting piece are also respectively connected with the electrode leading-out part and the tab; the part, embedded into the first concave part, of the first connecting piece or the second connecting piece is connected with the circumferential side wall of the first concave part in a welded mode. According to the battery monomer, the energy density of the battery monomer can be effectively improved.

Description

Technical Field

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

[0002] A current collector plate is a key component used in a battery cell, and it is mainly used to collect and conduct current. During the production process of a cylindrical battery cell, in order to solve the welding quality problem caused by the welding of different materials between the current collector plate and the end cap of the outer shell, a composite current collector plate is often used to connect the end cap and the tab of the electrode assembly, so that the end cap and the tab are electrically connected.

[0003] In the related art, the structure of the composite current collector plate is relatively complex. When connecting the end cap and the tab of the electrode assembly, it is easy to occupy more space in the outer shell, reducing the energy density of the battery cell. Summary of the Utility Model

[0004] The present application aims to solve the problem that the composite current collector plate occupies more space in the outer shell and reduces the energy density of the battery cell. To this end, the present application provides a battery cell, a battery device, and an electrical device.

[0005] In a first aspect, the present application provides a battery cell, including:

[0006] An outer shell assembly including an electrode lead-out portion for inputting or outputting electric energy;

[0007] An electrode assembly accommodated in the outer shell assembly, the electrode assembly including a tab, and the tab being made of a different material from the electrode lead-out portion;

[0008] A current collection assembly including a first connecting member made of the same material as the electrode lead-out portion and a second connecting member made of the same material as the tab;

[0009] Wherein, one of the first connecting member and the second connecting member is provided with a first recess, the other at least partially embeds into the first recess and is connected to the first recess, and the first connecting member and the second connecting member are also respectively connected to the electrode lead-out portion and the tab. The first recess is configured as an annular shape, and the portion of the first connecting member or the second connecting member that embeds into the first recess is welded and connected to the circumferential side wall of the first recess.

[0010] The battery cell according to the first aspect of the present application has at least the following beneficial effects:

[0011] For the battery cell of the present application, by setting the current collector assembly as the first connecting member and the second connecting member that are connected to each other, connecting the first connecting member with the same material to the electrode lead-out portion, connecting the second connecting member with the same material to the tab, the current collector assembly electrically conducts the electrode lead-out portion and the tab of the electrode assembly. At the same time, a first recess is formed in one of the first connecting member and the second connecting member of the current collector assembly, and at least a part of the other is embedded into the first recess and connected to the first recess, reducing the overall thickness after the connection of the first connecting member and the second connecting member. In this way, while solving the problem that the reliability of the battery cell is reduced due to the welding quality caused by abnormal material welding between the current collector assembly and the electrode lead-out portion or the tab, the space occupied by the current collector assembly in the housing assembly is effectively reduced, the space utilization rate of the housing assembly is improved, and thus the energy density of the battery cell is increased.

[0012] In addition, by configuring the first recess as a ring shape, the connection area between the first connecting member and the second connecting member can be increased, the current-carrying area between the first connecting member and the second connecting member is correspondingly increased, and the current-carrying capacity of the current collector assembly is improved. Moreover, the first connecting member and the second connecting member can be welded by butt welding, and the weld seam between the first connecting member and the second connecting member forms a butt weld seam. Compared with penetration welding, the material deformation problem of the first connecting member and the second connecting member caused by welding can be reduced. Moreover, the heat input requirement for butt welding is lower, and the probability that the welding heat of the first connecting member and the second connecting member extends to the connection between the second connecting member and the tab can be reduced, and the material deformation risk of the second connecting member or the tab caused by the above heat can be reduced.

[0013] In some embodiments, the first recess is formed on a side of the first connecting member away from the electrode lead-out portion, and the second connecting member is entirely embedded in the first recess.

[0014] With such a setting, on the one hand, the space occupied by the second connecting member in the housing assembly is reduced, the overall thickness of the current collector assembly is reduced, the space utilization rate of the housing assembly is improved, and the energy density of the battery cell is increased. On the other hand, it is difficult for the electrode lead-out portion to contact the second connecting member, improving the connection reliability between the electrode lead-out portion and the first connecting member.

[0015] In some embodiments, the first recess is formed on a side of the second connecting member facing away from the tab, and the first connecting member is entirely embedded in the first recess.

[0016] With such a setting, on the one hand, the space occupied by the first connecting member in the housing assembly is reduced, the overall thickness of the current collector assembly is reduced, the space utilization rate of the housing assembly is improved, and the energy density of the battery cell is increased. On the other hand, it is difficult for the tab to contact the first connecting member, improving the connection reliability between the tab and the second connecting member.

[0017] In some embodiments, the first recess is configured to penetrate through the annular cavity of the first connecting member. The second connecting member includes a main body portion and an annular convex portion protruding from the main body portion. The annular convex portion is embedded in the first recess, and the main body portion is stacked and attached to the first connecting member.

[0018] With such an arrangement, the main body portion of the second connecting member can provide positioning for the fitting of the annular convex portion and the first recess, improving the connection efficiency between the first connecting member and the second connecting member. Moreover, the main body portion can separate the first connecting member from the tab, preventing the tab from coming into contact with the first connecting member and enhancing the connection reliability between the tab and the second connecting member.

[0019] In some embodiments, the first recess is configured to penetrate through the stepped cavity of the first connecting member. The shape of the second connecting member matches that of the first recess and is entirely embedded in the first recess.

[0020] With such an arrangement, the stepped cavity provides positioning and guidance for the stepped second connecting member, improving the connection accuracy and stability between the first connecting member and the second connecting member. Meanwhile, the second connecting member can be welded to the stepped cavity by butt welding, correspondingly increasing the current-carrying area between the first connecting member and the second connecting member and enhancing the current-carrying capacity of the current collection assembly.

[0021] In some embodiments, the first recess includes a first annular cavity and a second annular cavity that are connected and communicate with each other. The inner diameter of the first annular cavity is smaller than the inner diameter of the second annular cavity.

[0022] With such an arrangement, the first annular cavity and the second annular cavity are distributed in a stepped manner, providing positioning and guidance for the second connecting member and improving the connection accuracy and stability between the first connecting member and the second connecting member.

[0023] In some embodiments, the second connecting member includes a main body portion and an annular convex portion protruding from the main body portion. The annular convex portion is embedded in the first annular cavity, and the main body portion is embedded in the second annular cavity and is welded to the circumferential side wall of the second annular cavity.

[0024] With such an arrangement, the main body portion of the second connecting member is welded to the circumferential side wall of the larger second annular cavity, without welding the annular convex portion to the first annular cavity. While enabling a larger current-carrying area between the first connecting member and the second connecting member, it reduces the welding difficulty between the first connecting member and the second connecting member and improves the connection efficiency between the first connecting member and the second connecting member.

[0025] In some embodiments, a second recess is formed on a side of the first connecting member away from the tab, and a part of the electrode lead-out portion is received in the second recess.

[0026] With such a setting, the occupied space of the electrode lead-out part in the housing assembly can be reduced, and the energy density of the battery cell can be further improved.

[0027] In a second aspect, the present application further provides a battery device, and the battery device includes the battery cell described above.

[0028] In a third aspect, the present application further provides an electrical device, and the electrical device includes the battery device described above, and the battery device is used to provide electrical energy.

[0029] The above description is only an overview of the technical solution 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 specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically gives the specific implementation manners of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0031] Figure 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application.

[0032] Figure 2 is another schematic structural diagram of a vehicle according to an embodiment of the present application.

[0033] Figure 3 is an exploded view of the structure of a battery device according to an embodiment of the present application.

[0034] Figure 4 is an exploded view of the structure of a battery cell according to an embodiment of the present application.

[0035] Figure 5 is a partial cross-sectional view of a part of the battery cell according to an embodiment of the present application.

[0036] Figure 6 is Figure 5 a partial enlarged view of A in

[0037] Figure 7 is an exploded view of the structure of a current collector assembly according to an embodiment of the present application Figure 1 .

[0038] Figure 8 is a cross-sectional view of the structure of a current collector assembly according to an embodiment of the present application Figure 1 .

[0039] Figure 9 is an exploded view of the structure of a current collector assembly according to an embodiment of the present applicationFigure 2 .

[0040] Figure 10 Is the structural section of the current collection component of the embodiment of the present application Figure 2 .

[0041] Figure 11 Is the structural section of the current collection component of the embodiment of the present application Figure 3 .

[0042] Figure 12 Is Figure 11 The structural decomposition diagram of.

[0043] Figure 13 Is the structural section of the current collection component of the embodiment of the present application Figure 4 .

[0044] Figure 14 Is Figure 13 The structural decomposition diagram of.

[0045] Description of reference numerals: Battery cell 10; Housing assembly 100; Electrode lead-out part 110; Housing 120; Housing body 121; Opening 1211; End cover 122; Electrode assembly 200; Tab 210; Current collection component 300; First connector 310; Second recess 311; Second connector 320; Main body part 321; First recess R1; First annular cavity R11; Second annular cavity R12; Annular protrusion 322; Battery device 20; Box body 21; Vehicle 30; Controller 40; Motor 50. Detailed implementation manners

[0046] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0047] In the description of the present application, it should be understood that if such terms as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing 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, and therefore should not be construed as a limitation to the present application.

[0048] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0049] In this application, unless otherwise clearly defined and limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can 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, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In this application, unless otherwise clearly defined and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" 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 "underneath" 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.

[0051] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0052] 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 applied to energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely applied to electric transportation means such as electric bicycles, electric motorcycles, electric vehicles, as well as multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of batteries, the market demand for them is also continuously increasing.

[0053] A battery is composed of one or more battery cells. For each battery, the multiple battery cells that make it up can be connected in series, in parallel, or in a combination of series and parallel (i.e., mixed connection). Among them, a mixed connection means that there are both series and parallel connections among multiple battery cells.

[0054] A battery cell is the smallest unit that makes up a battery. In the structure of a battery cell, it includes a housing, an electrolyte, and an electrode assembly. The electrode assembly is the component in the battery cell where electrochemical reactions occur, and the electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The housing can include one or more electrode assemblies. The electrode assembly is mainly formed by winding or laminating the positive electrode plate and the negative electrode plate, and a separator is usually disposed between the positive electrode plate and the negative electrode plate.

[0055] The housing has a structure with an open end and a hollow interior. The electrode assembly is disposed inside the housing, and an end cap is covered on the opening of the housing. By covering the end cap at the opening, an internal environment of the battery cell is formed. Of course, the end cap and the housing can also be integrated. Specifically, the end cap and the housing can first form a common connection surface before other components are inserted into the housing, and then the end cap is covered on the housing when it is necessary to encapsulate the interior of the housing. The housing can be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode assembly. The material of the housing can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this.

[0056] For a general battery cell, the outer shell of the battery cell usually includes a housing and an end cap. The end cap covers the opening of the housing. To facilitate the assembly of the battery cell, especially in a battery cell with a cylindrical structure, the end cap is usually used as the electrical energy output pole of the battery cell. By welding the tab of the electrode assembly and the end cap of the outer shell through a current collector plate disposed inside the outer shell, the electrical connection between the electrode assembly and the end cap can be achieved. The current collector plate is used to collect and conduct current to realize the input or output of the electrical energy of the battery cell.

[0057] However, in the battery cell with the above structure, the tab of the electrode assembly is usually made of copper or aluminum, and the current collector plate is set to the same material as the tab to facilitate reducing the welding difficulty between the tab and the current collector plate. And to improve the structural strength of the outer shell, the outer shell is usually made of steel or other materials. This will result in different materials between the tab of the electrode assembly and the end cap of the outer shell, and thus different materials between the current collector plate and the end cap. When the current collector plate and the end cap are welded to each other, phenomena such as different melting points and different thermal expansion coefficients will occur, resulting in welding cracks between the current collector plate and the end cap and reducing the reliability of the battery cell.

[0058] In the related art, in order to solve the problem that the welding quality caused by the welding of different materials between the current collector plate and the end cap reduces the reliability of the battery cell, a composite current collector plate is often used. The composite current collector plate includes two connecting members. The material of one connecting member is the same as that of the end cap so as to be stably welded to the end cap, and the material of the other connecting member is the same as that of the tab so as to be stably welded to the tab. However, in the composite current collector plate with the above structure, the two connecting members are generally directly stacked, which increases the overall thickness of the composite current collector plate, resulting in that when the composite current collector plate is welded to the end cap and the tab, it is easy to occupy more space of the outer shell, reducing the energy density of the battery cell.

[0059] Based on the above considerations, in order to solve the problem that the composite current collector plate occupies more space of the outer shell and reduces the energy density of the battery cell, one or more embodiments of the present application provide a battery cell, which includes an outer shell assembly, an electrode assembly and a current collector assembly. The outer shell assembly includes an electrode lead-out part for inputting or outputting electric energy. The electrode assembly is accommodated in the outer shell assembly, and the electrode assembly includes tabs, and the material of the tabs is different from that of the electrode lead-out part. The current collector assembly includes a first connecting member having the same material as the electrode lead-out part and a second connecting member having the same material as the tab. One of the first connecting member and the second connecting member is provided with a first recess, and the other at least partially embeds into the first recess and is connected to the first recess, and the first connecting member and the second connecting member are also respectively connected to the electrode lead-out part and the tab.

[0060] In the battery cell with this structure, by setting the current collector assembly as the mutually connected first connecting member and second connecting member, connecting the first connecting member with the same material as the electrode lead-out part, connecting the second connecting member with the same material as the tab, the current collector assembly electrically conducts the electrode lead-out part and the tab of the electrode assembly. At the same time, a first recess is provided on one of the first connecting member and the second connecting member of the current collector assembly, and at least a part of the other is embedded into the first recess and connected to the first recess, reducing the overall thickness after the connection of the first connecting member and the second connecting member. In this way, while solving the problem that the welding quality caused by the welding of abnormal materials between the current collector assembly and the electrode lead-out part or the tab reduces the reliability of the battery cell, the space occupied by the current collector assembly in the space of the outer shell assembly is effectively reduced, the space utilization rate of the outer shell assembly is improved, and thus the energy density of the battery cell is improved.

[0061] The embodiment of the present application also provides a battery device, and the battery device includes the above-mentioned battery cell. The battery cell can form the smallest unit of the battery device, and the battery device can include a battery module or a battery pack, etc.

[0062] The battery device can be used in electrical equipment that uses the battery device as a power source, or in various energy storage systems that use the battery device as an energy storage element. The electrical equipment can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, and so on. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0063] See Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of a vehicle according to some embodiments of the present application. The vehicle 30 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, or an extended-range vehicle, etc. A battery device 20 is disposed inside the vehicle 30. The battery device 20 can be disposed at the bottom, head, or tail of the vehicle 30. The battery device 20 can be used for power supply of the vehicle 30. For example, the battery device 20 can serve as the operating power source of the vehicle 30. The vehicle 30 can also include a controller 40 and a motor 50. The controller 40 is used to control the battery device 20 to supply power to the motor 50. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 30.

[0064] Of course, in other embodiments, the battery device 20 can not only serve as the operating power source of the vehicle 30, but also serve as the driving power source of the vehicle 30, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 30.

[0065] See Figure 3 , the battery device 20 mentioned in the present application can include a battery module or a battery pack, etc. The battery cell 10 can constitute the smallest unit of the battery device 20.

[0066] See Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , embodiments of the present application provide a battery cell 10. The battery cell 10 includes a housing assembly 100, an electrode assembly 200, and a current collector assembly 300.

[0067] The housing assembly 100 includes an electrode lead-out portion 110 for inputting or outputting electrical energy. The electrode assembly 200 is accommodated in the housing assembly 100. The electrode assembly 200 includes a tab 210. The tab 210 is made of a different material from the electrode lead-out portion 110. The current collector assembly 300 includes a first connecting member 310 made of the same material as the electrode lead-out portion 110 and a second connecting member 320 made of the same material as the tab 210.

[0068] Wherein, one of the first connecting member 310 and the second connecting member 320 is provided with a first recess R1, the other is at least partially embedded in the first recess R1 and connected to the first recess R1, and the first connecting member 310 and the second connecting member 320 are also respectively connected to the electrode lead-out portion 110 and the tab 210.

[0069] It should be noted that in this application, referring to Figure 4 , the housing assembly 100 includes a housing 120. The electrode assembly 200 and the current collector assembly 300 are both accommodated in the housing 120, and the housing 120 can also be used to accommodate an electrolyte, such as an electrolytic solution. The housing 120 can be a cylinder, a cuboid, etc., and the material of the housing 120 can be steel, copper, iron, aluminum, aluminum alloy, etc.

[0070] The housing assembly 100 includes an electrode lead-out portion 110 for inputting or outputting electric energy. The electrode lead-out portion 110 functions to electrically connect to the tab 210 of the electrode assembly 200, so as to output or input the electric energy of the battery cell 10. The electrode lead-out portion 110 can be the positive or negative electrode for outputting the battery cell 10, that is, the electrode lead-out portion 110 is the positive output electrode or the negative output electrode of the battery cell 10.

[0071] The structure of the electrode lead-out portion 110 can be various. The electrode lead-out portion 110 can be a wall portion of the housing 120, or an electrode terminal (pole column) installed on the wall portion of the housing 120. Exemplarily, in Figure 4 and Figure 5 , the electrode lead-out portion 110 is a wall portion of the housing 120.

[0072] In some embodiments, the housing 120 may include a housing body 121 and an end cap 122. An accommodation cavity is formed inside the housing body 121. The accommodation cavity is used to accommodate the electrode assembly 200, and the accommodation cavity has an opening 1211, that is, the housing body 121 is a hollow structure with one end open at 1211. The end cap 122 is covered at the opening 1211 of the housing body 121 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 200 and the electrolyte.

[0073] When assembling the battery cell 10, the electrode assembly 200 can be first placed into the housing body 121, and the electrolyte can be filled into the housing body 121, and then the end cap 122 is covered at the opening 1211 of the housing body 121 to complete the assembly of the battery cell 10.

[0074] It should be noted that the wall portion on the outer shell 120 for installing the electrode lead portion 110 can be the end cap 122 or a wall of the housing 121. When the electrode lead portion 110 is an electrode terminal installed on the wall portion of the outer shell 120, the electrode lead portion 110 is insulatedly installed on the outer shell 120, and the output electrode with the opposite polarity to the electrode lead portion 110 of the battery cell 10 can be the housing 121 of the outer shell 120 or the end cap 122 of the outer shell 120; when the electrode lead portion 110 is the housing 121 of the outer shell 120, the output electrode with the opposite polarity to the electrode lead portion 110 of the battery cell 10 can be an electrode terminal insulatedly installed on the wall portion of the outer shell 120 or an end cap 122 insulatedly connected to the housing 121; when the electrode lead portion 110 is the end cap 122 of the outer shell 120, the output electrode with the opposite polarity to the electrode lead portion 110 of the battery cell 10 can be an electrode terminal insulatedly installed on the wall portion of the outer shell 120 or a housing 121 insulatedly connected to the end cap 122.

[0075] The housing 121 can be of various shapes, for example, a cylinder, a cuboid or a prism structure, etc. The shape of the housing 121 can be determined according to the specific shape of the electrode assembly 200. For example, if the electrode assembly 200 is a cylinder structure, a cylinder structure housing 121 can be selected; if the electrode assembly 200 is a cuboid structure, a cuboid structure housing 121 can be selected. Of course, the structure of the end cap 122 can also be various, for example, the end cap 122 is a plate-like structure or a hollow structure with one end open, etc. Exemplarily, in Figure 3 、 Figure 4 and Figure 5 the housing 121 is a cylinder structure.

[0076] In the present application, the electrode assembly 200 is a component in the battery cell 10 where an electrochemical reaction occurs. The electrode assembly 200 can include a positive electrode sheet, a negative electrode sheet and a separator. Among them, the structure of the electrode assembly 200 can be various. For example, the electrode assembly 200 can be a wound structure formed by winding a positive electrode sheet, a separator and a negative electrode sheet, or a stacked structure formed by stacking a positive electrode sheet, a separator and a negative electrode sheet. The tab 210 of the electrode assembly 200 is a component formed by laminating and connecting regions on the positive electrode sheet where the positive electrode active material layer is not coated or regions on the negative electrode sheet where the negative electrode active material layer is not coated.

[0077] Exemplarily, in Figure 3 and Figure 4 the electrode assembly 200 is a wound structure formed by winding a positive electrode sheet, a separator and a negative electrode sheet, and the electrode assembly 200 is generally cylindrical. Among them, there are two tabs 210 for each electrode assembly 200, and the two tabs 210 are respectively used to output or input the positive and negative electrodes of the electrode assembly 200.

[0078] The material of the tab 210 is different from that of the electrode lead-out portion 110, that is, the tab 210 and the electrode lead-out portion 110 are made of different materials. The material of the tab 210 can also be various. For example, copper or aluminum, etc. If the tab 210 is a positive tab 210, the material of the tab 210 is usually aluminum; if the tab 210 is a negative tab 210, the material of the tab 210 is usually copper.

[0079] It should be noted that the difference in the materials of the tab 210 and the electrode lead-out portion 110 means that the main components of the tab 210 and the electrode lead-out portion 110 are different. For example, if both the tab 210 and the electrode lead-out portion 110 are single materials, such as copper or aluminum, then the materials of the tab 210 and the electrode lead-out portion 110 are composed of different metal elements; if the tab 210 and the electrode lead-out portion 110 are alloy materials or mixed materials, such as aluminum alloy or steel, etc., then the difference in the materials of the tab 210 and the electrode lead-out portion 110 is that the main components of the tab 210 and the electrode lead-out portion 110 are different, rather than just referring to the difference in the content of the components.

[0080] In this application, referring to Figure 5 、 Figure 6 、 Figure 7 and Figure 8 ,the current collector assembly 300 includes a first connecting member 310 made of the same material as the electrode lead-out portion 110 and a second connecting member 320 made of the same material as the tab 210, and one of the first connecting member 310 and the second connecting member 320 is provided with a first recess R1, and the other at least partially embeds into the first recess R1 and is connected to the first recess R1.

[0081] That is, the current collector assembly 300 is formed by the mutual embedding and connection of the first connecting member 310 and the second connecting member 320 made of different materials, so that the first connecting member 310 and the second connecting member 320 are electrically connected. The first recess R1 can be a groove, a through cavity, a stepped groove, a stepped cavity, etc. Exemplarily, the first recess R1 is provided on the first connecting member 310, and the second connecting member 320 is partially or completely embedded into the first recess R1 and is welded to the inner wall of the first recess R1. Another example is that the first recess R1 is provided on the second connecting member 320, and the first connecting member 310 is partially or completely embedded into the first recess R1 and is welded to the inner wall of the first recess R1.

[0082] The materials of the electrode lead-out portion 110, the first connector 310, the second connector 320 and the tab 210 can all be selected from one of steel, copper, iron, aluminum, aluminum alloy, etc., and the electrode lead-out portion 110 and the first connector 310 are made of the same material, and the second connector 320 and the tab 210 are made of the same material. Exemplarily, the electrode lead-out portion 110 is a wall portion of the housing 120 (such as the end cap 122), and its material is steel, and correspondingly, the material of the first connector 310 is also steel; similarly, the tab 210 is a negative tab, and its material is copper, and correspondingly, the material of the second connector 320 is also copper.

[0083] It should be noted that the electrode lead-out part 110 and the first connector 310 are made of the same material, which means that the main component of the electrode lead-out part 110 is the same as the main component of the first connector 310. For example, if the electrode lead-out part 110 and the first connector 310 are made of a single material, such as copper or aluminum, the electrode lead-out part 110 and the first connector 310 are composed of the same metal element. If the electrode lead-out part 110 and the first connector 310 are made of an alloy material or a mixed material, such as aluminum alloy or steel, the electrode lead-out part 110 and the first connector 310 are made of the same material, which means that the main component of the electrode lead-out part 110 and the first connector 310 is the same. If the electrode lead-out part 110 and the first connector 310 are only different in the content of the components, they are also made of the same material, such as low carbon steel, medium carbon steel and high carbon steel. The material of the tab 210 and the second connector 320 is the same, and will not be repeated here.

[0084] In some embodiments, the battery cell 10 may further include a pressure relief mechanism (not shown in the figure), which is mounted on the housing 120. Optionally, the pressure relief mechanism may be disposed on the end cover 122 or on the housing 121. The pressure relief mechanism is used to release the pressure inside the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a predetermined value. Exemplarily, the pressure relief mechanism may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or a safety valve.

[0085] It should be noted that see 5. Figure 6 , Figure 7 and Figure 8 In the current collecting assembly 300, the first connecting member 310 can be circular, rectangular, hexagonal or other shapes suitable for the application scenario. Similarly, the second connecting member 320 can be circular, rectangular, hexagonal or other shapes suitable for the application scenario. The first recess R1 is a circular groove, rectangular groove, cylindrical cavity, rectangular cavity, hexagonal cavity, etc. opened on the first connecting member 310 or the second connecting member 320.

[0086] The connection method between the first connecting member 310 and the second connecting member 320 can be, but is not limited to, resistance welding, laser welding, friction welding, ultrasonic welding, etc. Although there is a possibility of welding cracks due to the different materials of the first connecting member 310 and the second connecting member 320, the welding cracks formed between the first connecting member 310 and the second connecting member 320 are located inside the housing 120 of the housing assembly 100, and they will not affect the sealing performance of the housing 120, thus being able to alleviate the risk of liquid leakage.

[0087] In addition, the connection method between the first connecting member 310 and the electrode lead-out portion 110 can be, but is not limited to, resistance welding, laser welding, friction welding, ultrasonic welding, etc., and the connection method between the second connecting member 320 and the tab 210 can be, but is not limited to, resistance welding, laser welding, friction welding, ultrasonic welding, etc.

[0088] See Figure 5 、 Figure 6 、 Figure 7 and Figure 8 Taking the first concave portion R1 formed in the first connecting member 310 as an example, the connection relationship among the first connecting member 310, the second connecting member 320, the tab 210, and the electrode lead-out portion 110 is described as follows: The first concave portion R1 is an annular groove formed on the side of the first connecting member 310 close to the tab 210, the opening of the annular groove faces the electrode tab 210, and the groove depth of the annular groove is greater than or equal to the thickness of the first connecting member 310. Correspondingly, the second connecting member 320 is annular, the second connecting member 320 is entirely embedded in the annular groove, and at least part of the outer wall of the second connecting member 320 is welded to at least part of the inner wall of the annular groove, so that the first connecting member 310 and the second connecting member 320 are electrically connected. At the same time, the electrode lead-out portion 110 is in contact with the first connecting member 310 and is welded, and the second connecting member 320 is in contact with the tab 210 and is welded.

[0089] In this way, the annular groove on the first connecting member 310 provides an installation space for the second connecting member 320, reduces the occupied space of the second connecting member 320 inside the housing 120, improves the space utilization rate of the housing 120, and thus improves the energy density of the battery cell 10.

[0090] In addition, in this embodiment, in order to further improve the space utilization rate of the housing 120, a second concave portion 311 is further formed on the side of the first connecting member 310 away from the tab 210, and part of the electrode lead-out portion 110 is embedded in the second concave portion 311, reducing the occupied space of the electrode lead-out portion 110 inside the housing 120 and further improving the energy density of the battery cell 10.

[0091] It is not difficult to understand that for the battery cell 10 according to the embodiment of the present application, by setting the current collecting component 300 as the mutually connected first connecting member 310 and second connecting member 320, and connecting the first connecting member 310 made of the same material to the electrode lead-out portion 110, and connecting the second connecting member 320 made of the same material to the tab 210, the current collecting component 300 electrically conducts the electrode lead-out portion 110 and the tab 210 of the electrode assembly 200. At the same time, a first recess R1 is formed in one of the first connecting member 310 and the second connecting member 320 of the current collecting component 300, and at least a part of the other is embedded in the first recess R1 and connected to the first recess R1, so as to reduce the overall thickness after the connection of the first connecting member 310 and the second connecting member 320. In this way, while solving the problem that the reliability of the battery cell 10 is reduced due to the welding quality caused by abnormal material welding between the current collecting component 300 and the electrode lead-out portion 110 or the tab 210, the space occupied by the current collecting component 300 in the housing assembly 100 is effectively reduced, the space utilization rate of the housing assembly 100 is improved, and thus the energy density of the battery cell 10 is improved.

[0092] See Figure 5 , Figure 6 , Figure 7 and Figure 8 , in some embodiments of the present application, the first recess R1 is configured as an annular shape, and the part of the first connecting member 310 or the second connecting member 320 embedded in the first recess R1 is welded and connected to the circumferential side wall of the first recess R1.

[0093] For example, in one embodiment, the first recess R1 is a circular groove formed on the side of the first connecting member 310 close to the tab 210, the opening of the circular groove faces the tab 210, the second connecting member 320 is entirely filled in the circular groove, and the side of the second connecting member 320 close to the tab 210 is in the same plane as the opening of the circular groove. The circumferential side wall of the second connecting member 320 is welded and connected to the circumferential inner wall of the circular groove. The welding method can be resistance welding, laser welding, etc. The side of the second connecting member 320 close to the tab 210 is welded and connected to the tab 210, and the welding method can be penetration welding, laser welding, etc.

[0094] Of course, in the above embodiment, the side of the second connecting member 320 close to the tab 210 can also be set to be slightly convex from the opening of the circular groove, so that the second connecting member 320 can be welded and connected to the tab 210.

[0095] By setting the first recess R1 to be annular and welding the part of the first connecting member 310 or the second connecting member 320 that is embedded in the first recess R1 to the circumferential side wall of the first recess R1, the connection area between the first connecting member 310 and the second connecting member 320 can be increased, correspondingly increasing the current-carrying area between the first connecting member 310 and the second connecting member 320 and improving the current-carrying capacity of the current-collecting assembly 300.

[0096] Moreover, the first connecting member 310 and the second connecting member 320 can be welded by butt welding to form a butt weld at the weld between the first connecting member 310 and the second connecting member 320. Compared with penetration welding, it can reduce the material deformation problem of the first connecting member 310 and the second connecting member 320 caused by welding. Moreover, the butt welding requires a lower heat input, which can reduce the probability that the welding heat of the first connecting member 310 and the second connecting member 320 extends to the connection between the second connecting member 320 and the tab 210, and reduce the risk of material deformation of the second connecting member 320 or the tab 210 caused by the above heat.

[0097] See Figure 5 、 Figure 6 、 Figure 7 and Figure 9 , in some embodiments, the first recess R1 is opened on the side of the first connecting member 310 away from the electrode lead-out portion 110, and the second connecting member 320 is entirely embedded in the first recess R1.

[0098] It should be noted that the two sides of the first connecting member 310 mentioned in this application refer to the relative two sides of the first connecting member 310 in its own thickness direction, and the same applies to the two sides of the second connecting member 320, which will not be elaborated here.

[0099] Specifically, the first recess R1 is configured to be annular, and the axis of the first connecting member 310, the axis of the first recess R1, and the axis of the second connecting member 320 are coaxial, improving the connection accuracy between the first connecting member 310 and the second connecting member 320.

[0100] The first recess R1 is configured as a circular groove, and the second connecting member 320 is configured as a cylindrical block adapted to the shape of the circular groove. The second connecting member 320 is entirely embedded in the circular groove, and the circumferential outer wall of the second connecting member 320 is welded to the circumferential inner wall of the circular groove. The welding method can be resistance welding, laser welding, etc. The side of the second connecting member 320 away from the electrode lead-out portion 110 is attached to and directly welded to the tab 210, and the welding method can be penetration welding, laser welding, etc. The side of the first connecting member 310 away from the tab 210 is attached to and directly welded to the electrode lead-out portion 110, and the welding method can be penetration welding, laser welding, etc.

[0101] By providing the first recess R1 on the side of the first connecting member 310 away from the electrode lead-out portion 110 and embedding the second connecting member 320 entirely in the first recess R1, on the one hand, the occupied space of the second connecting member 320 within the housing assembly 100 is reduced, the overall thickness of the current collecting assembly 300 is decreased, the space utilization rate of the housing assembly 100 is improved, and the energy density of the battery cell 10 is increased. On the other hand, it is difficult for the electrode lead-out portion 110 to come into contact with the second connecting member 320, enhancing the connection reliability between the electrode lead-out portion 110 and the first connecting member 310.

[0102] In addition, referring to Figure 6 , in the above embodiment, the inner diameter of the annular first recess R1 can also be set to be smaller than the width of the tab 210, such that a part of the structure of the tab 210 is outside the projection range of the first recess R1. The structure of the tab 210 outside the projection range of the first recess R1 is curved in an arc away from the electrode lead-out portion 110, and / or the opening edge of the first recess R1 is curved in an arc towards the electrode lead-out portion 110. In this way, a gap space can be formed between the circumferential edge of the tab 210 and the circumferential edge of the opening of the first recess R1. This gap makes it difficult for the first connecting member 310 to come into contact with the tab 210, thereby reducing the risk of forming a welded connection between the first connecting member 310 and the tab 210 and improving the welding quality between the second connecting member 320 and the tab 210.

[0103] Referring to Figure 9 and Figure 10 , in some embodiments of the present application, the first recess R1 is provided on the side of the second connecting member 320 facing away from the tab 210, and the first connecting member 310 is entirely embedded in the first recess R1.

[0104] Specifically, the first recess R1 is configured to be annular, and the axes of the first connecting member 310, the first recess R1, and the second connecting member 320 are coaxial, improving the connection accuracy between the first connecting member 310 and the second connecting member 320.

[0105] The first recess R1 is configured as a circular groove, and the first connecting member 310 is configured as a cylindrical block adapted to the shape of the circular groove. The first connecting member 310 is entirely embedded in the circular groove, and the circumferential outer wall of the first connecting member 310 is welded to the circumferential inner wall of the circular groove. The welding method can be resistance welding, laser welding, etc. The side of the second connecting member 320 away from the electrode lead-out portion 110 is attached to and directly welded to the tab 210. The welding method can be penetration welding, laser welding, etc. The side of the first connecting member 310 away from the tab 210 is attached to and directly welded to the electrode lead-out portion 110. The welding method can be penetration welding, laser welding, etc.

[0106] By providing the first recess R1 on the side of the second connecting member 320 facing away from the tab 210 and fully embedding the first connecting member 310 into the first recess R1, on the one hand, the occupied space of the first connecting member 310 within the housing assembly 100 is reduced, the overall thickness of the current collecting assembly 300 is decreased, the space utilization rate of the housing assembly 100 is improved, and the energy density of the battery cell 10 is increased. On the other hand, it is difficult for the tab 210 to come into contact with the first connecting member 310, thereby improving the connection reliability between the tab 210 and the second connecting member 320.

[0107] See Figure 11 and Figure 12 , in some embodiments of the present application, the first recess R1 is configured as an annular cavity penetrating through the first connecting member 310. The second connecting member 320 includes a main body portion 321 and an annular protrusion 322 protruding from the main body portion 321. The annular protrusion 322 is embedded in the first recess R1, and the main body portion 321 is stacked and attached to the first connecting member 310.

[0108] Specifically, the axis of the first connecting member 310, the axis of the first recess R1, and the axis of the annular protrusion 322 of the second connecting member 320 are coaxial, which improves the connection accuracy between the first connecting member 310 and the second connecting member 320.

[0109] The first recess R1 is configured as a cylindrical cavity, and the annular protrusion 322 of the second connecting member 320 is configured as a cylindrical block adapted to the shape of the first recess R1. The circumferential outer wall of the annular protrusion 322 of the second connecting member 320 is welded to the circumferential side wall of the first recess R1. The welding method can be resistance welding, laser welding, etc. The main body portion 321 of the second connecting member 320 is attached to the side of the first connecting member 310 away from the electrode lead-out portion 110, so that the first connecting member 310 and the second connecting member 320 are stably connected. It should be noted that the annular protrusion 322 and the main body portion 321 of the second connecting member 320 are integrally formed structures.

[0110] Meanwhile, the side of the main body portion 321 away from the electrode lead-out portion 110 is attached to and directly welded to the tab 210. The welding method can be penetration welding, laser welding, etc. The side of the first connecting member 310 away from the tab 210 is attached to and directly welded to the electrode lead-out portion 110. The welding method can be penetration welding, laser welding, etc.

[0111] Of course, in order to prevent the annular protrusion 322 of the second connecting member 320 from coming into contact with the electrode lead-out portion 110, the thickness of the annular protrusion 322 can be set to be slightly less than the depth of the first recess R1.

[0112] In the above structure, the main body portion 321 of the second connecting member 320 can provide positioning for the fitting of the annular convex portion 322 and the first concave portion R1, improving the connection efficiency between the first connecting member 310 and the second connecting member 320. Moreover, the main body portion 321 can separate the first connecting member 310 from the tab 210, preventing the tab 210 from contacting the first connecting member 310 and enhancing the connection reliability between the tab 210 and the second connecting member 320.

[0113] Referring to Figure 13 and Figure 14 , in some embodiments of the present application, the first concave portion R1 is configured to penetrate through the stepped cavity of the first connecting member 310, and the shape of the second connecting member 320 matches that of the first concave portion R1 and is entirely embedded in the first concave portion R1.

[0114] It should be noted that the stepped cavity refers to having a plurality of interconnected sub-cavities, and the inner diameters of all the sub-cavities show an increasing or decreasing trend along a fixed direction. Correspondingly, the second connecting member 320 includes a plurality of stacked sub-connecting blocks, and the outer diameters of all the sub-connecting blocks show an increasing or decreasing trend along a fixed direction. The plurality of sub-connecting blocks are respectively and fittingly embedded with the plurality of sub-cavities.

[0115] The axes of the first connecting member 310, the stepped cavity, and the second connecting member 320 are coaxial, improving the connection accuracy between the first connecting member 310 and the second connecting member 320.

[0116] By setting the first concave portion R1 to penetrate through the stepped cavity of the first connecting member 310, the stepped cavity provides positioning and guidance for the stepped second connecting member 320, improving the connection accuracy and stability between the first connecting member 310 and the second connecting member 320. At the same time, the second connecting member 320 can be welded to the stepped cavity by butt welding, correspondingly increasing the current-carrying area between the first connecting member 310 and the second connecting member 320 and enhancing the current-carrying capacity of the current collector assembly 300.

[0117] Furthermore, referring to Figure 13 and Figure 14 , the first concave portion R1 includes a first annular cavity R11 and a second annular cavity R12 that are connected and communicate with each other. The inner diameter of the first annular cavity R11 is smaller than that of the second annular cavity R12. The second connecting member 320 includes a main body portion 321 and an annular convex portion 322 protruding from the main body portion 321. The annular convex portion 322 is embedded in the first annular cavity R11, and the main body portion 321 is embedded in the second annular cavity R12 and is welded to the circumferential side wall of the second annular cavity R12.

[0118] It should be noted that the first annular cavity R11, the second annular cavity R12, and the annular convex portion 322 of the second connecting member 320 are coaxially distributed, and the shape of the annular convex portion 322 is adapted to the shape of the first annular cavity R11.

[0119] The entire annular convex portion 322 is embedded within the first annular cavity R11 and is in contact and fit with the circumferential side wall of the first annular cavity R11. The main body portion 321 is entirely embedded within the second annular cavity R12 and is welded to the circumferential side wall of the second annular cavity R12 to form a butt weld. The welding method can be resistance welding, laser welding, etc. At the same time, one side of the main body portion 321 away from the electrode lead-out portion 110 is directly welded to the tab 210. The welding method can be penetration welding, laser welding, etc. One side of the first connecting member 310 away from the tab 210 is in contact with and directly welded to the electrode lead-out portion 110. The welding method can be penetration welding, laser welding, etc. It should be noted that the annular convex portion 322 and the main body portion 321 of the second connecting member 320 are integrally formed structures.

[0120] In the above structure, the first annular cavity R11 and the second annular cavity R12 are arranged in a stepped manner, providing positioning and guidance for the second connecting member 320, improving the connection accuracy and stability between the first connecting member 310 and the second connecting member 320. At the same time, the main body portion 321 of the second connecting member 320 is welded to the circumferential side wall of the larger second annular cavity R12, and the annular convex portion 322 is not welded to the first annular cavity R11. While having a larger current-carrying area between the first connecting member 310 and the second connecting member 320, it reduces the welding difficulty between the first connecting member 310 and the second connecting member 320 and improves the connection efficiency between the first connecting member 310 and the second connecting member 320.

[0121] In some embodiments of the present application, a second recess 311 is formed on one side of the first connecting member 310 away from the tab 210, and a part of the electrode lead-out portion 110 is received within the second recess 311.

[0122] Specifically, the second recess 311 can be a groove, a through cavity, a stepped groove, a stepped cavity, etc.

[0123] For example, in one embodiment, referring to Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , a first recess R1 is provided on one side of the first connecting member 310 close to the tab 210. The first recess R1 is an annular groove. A second recess 311 is provided on one side of the first connecting member 310 away from the tab 210. The second recess 311 is a circular through cavity. The first recess R1 and the second recess 311 are coaxially connected. The entire second connecting member 320 is embedded within the first recess R1 and is welded to the circumferential side wall of the first recess R1. The bottom of the electrode lead-out portion 110 is embedded within the second recess 311 and is welded to the circumferential side wall of the second recess 311. In this way, the occupied space of the second connecting member 320 and the electrode lead-out portion 110 within the housing assembly 100 can be reduced simultaneously, further improving the energy density of the battery cell 10.

[0124] In addition, in the above embodiments, the inner diameter of the first recess R1 is larger than the inner diameter of the second recess 311, so that a stepped positioning is formed between the first recess R1 and the second recess 311, providing positioning and guidance for the second connecting member 320, and improving the connection accuracy and stability between the first connecting member 310 and the second connecting member 320.

[0125] Of course, in the above embodiments, the second recess 311 and the first recess R1 may also be arranged at intervals and not communicate with each other, so that the welding connection between the first connecting member 310 and the second connecting member 320 and the welding connection between the first connecting member 310 and the electrode lead-out portion 110 are independent of each other and do not interfere with each other, improving the reliability of the battery cell 10.

[0126] For example, in another embodiment, referring to Figure 9 and Figure 10 , the first recess R1 is arranged on the side of the second connecting member 320 away from the tab 210. The first connecting member 310 is embedded in the first recess R1 and welded to the circumferential side wall of the first recess R1. The middle part of the first connecting member 310 is penetrated to form the second recess 311, and the electrode lead-out portion 110 is embedded in the second recess 311 and welded to the circumferential side wall of the second recess 311. In this way, the occupied space of the first connecting member 310 and the electrode lead-out portion 110 inside the housing assembly 100 can be reduced at the same time, further improving the energy density of the battery cell 10.

[0127] It is not difficult to understand that by providing the second recess 311 on the side of the first connecting member 310 away from the tab 210 and partially accommodating the electrode lead-out portion 110 in the second recess 311, the occupied space of the electrode lead-out portion 110 in the housing assembly 100 can be reduced, and the energy density of the battery cell 10 can be further improved.

[0128] Referring to Figure 3 , the embodiment of the present application also provides a battery device 20, and the battery device 20 includes the battery cell 10 of any of the above embodiments.

[0129] Specifically, the battery device 20 may be a battery module composed of one or more battery cells 10. For the battery device 20, the multiple battery cells 10 constituting it may be connected in series, in parallel, or in a hybrid connection. Among them, the hybrid connection means that there are both series and parallel connections among the multiple battery cells 10.

[0130] Referring to Figure 3 , the battery device 20 may also be a battery pack in which multiple battery cells 10 are placed in a box 21.

[0131] It is not difficult to understand that for the battery device 20 according to the embodiments of the present application, since the above-mentioned battery cell 10 is configured, the battery cell 10 has better use reliability, which is beneficial to improving the use reliability and service life of the battery device 20.

[0132] The embodiments of the present application further provide an electrical device, and the electrical device includes the battery device 20 according to any of the above embodiments.

[0133] Specifically, referring to Figure 1 and Figure 2 , the electrical device can be a vehicle 30, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle 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.; the spacecraft includes an airplane, a rocket, a space shuttle, 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, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, a hammer drill, an impact drill, a concrete vibrator, a planer, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electrical devices.

[0134] For the electrical device according to the embodiments of the present application, since the above-mentioned battery device is configured, the battery device has use reliability, which is beneficial to improving the use reliability and service life of the electrical device.

[0135] Referring to Figures 1 to 14 , the embodiments of the present application provide a battery cell 10, and the battery cell 10 includes: a housing assembly 100 including an electrode lead-out portion 110 for inputting or outputting electric energy; an electrode assembly 200 accommodated in the housing assembly 100, the electrode assembly 200 including a tab 210, and the tab 210 is made of a different material from the electrode lead-out portion 110; a current collecting assembly 300 including a first connecting member 310 made of the same material as the electrode lead-out portion 110 and a second connecting member 320 made of the same material as the tab 210; wherein, one of the first connecting member 310 and the second connecting member 320 is provided with a first recess R1, the other at least partially embeds into the first recess R1 and is connected to the first recess R1, and the first connecting member 310 and the second connecting member 320 are also respectively connected to the electrode lead-out portion 110 and the tab 210.

[0136] The embodiments of the present application further provide a battery device 20 and an electrical device. The battery device 20 includes the above-mentioned battery cell 10, the electrical device includes the above-mentioned battery device 20, and the battery device 20 is used to provide electric energy.

[0137] The battery cell 10, battery device 20, and electrical equipment according to the embodiments of the present application connect the current collector assembly 300 as a first connecting member 310 and a second connecting member 320 that are connected to each other. The first connecting member 310 made of the same material is connected to the electrode lead-out portion 110, and the second connecting member 320 made of the same material is connected to the tab 210, so that the current collector assembly 300 electrically conducts the electrode lead-out portion 110 and the tab 210 of the electrode assembly 200. At the same time, a first recess R1 is formed in one of the first connecting member 310 and the second connecting member 320 of the current collector assembly 300, and at least a part of the other is embedded in the first recess R1 and connected to the first recess R1, reducing the overall thickness after the connection of the first connecting member 310 and the second connecting member 320. In this way, while solving the problem that the reliability of the battery cell 10 is reduced due to the welding quality caused by abnormal material welding between the current collector assembly 300 and the electrode lead-out portion 110 or the tab 210, the space occupied by the current collector assembly 300 in the housing assembly 100 is effectively reduced, the space utilization rate of the housing assembly 100 is improved, and thus the energy density of the battery cell 10 is increased.

[0138] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0139] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A battery cell, characterized in that: include: A housing assembly including an electrode lead-out portion for inputting or outputting electrical energy; An electrode assembly, contained in the housing assembly, the electrode assembly comprising a tab, the tab being made of a different material from the electrode lead-out portion; The current collecting assembly comprises a first connecting member made of the same material as the electrode lead-out portion and a second connecting member made of the same material as the electrode tab; Among them, one of the first connecting member and the second connecting member is provided with a first recess, and the other is at least partially embedded in the first recess and connected to the first recess, and the first connecting member and the second connecting member are also respectively connected to the electrode lead-out portion and the electrode ear, the first recess is constructed in a ring shape, and the portion of the first connecting member or the second connecting member embedded in the first recess is welded to the circumferential side wall of the first recess.

2. The battery cell according to claim 1, characterized in that: The first recess is formed at a side of the first connecting member away from the electrode lead-out portion, and the second connecting member is completely embedded in the first recess.

3. The battery cell according to claim 1, characterized in that: The first recess is formed on a side of the second connecting member away from the pole ear, and the first connecting member is completely embedded in the first recess.

4. The battery cell according to claim 1, characterized in that: The first recess is constructed as an annular cavity penetrating the first connector. The second connector includes a main body and an annular protrusion protruding from the main body. The annular protrusion is embedded in the first recess. The main body is stacked and fitted with the first connector.

5. The battery cell according to claim 1, characterized in that: The first recess is configured as a stepped cavity penetrating the first connecting member, and the shape of the second connecting member matches the first recess and is completely embedded in the first recess.

6. The battery cell according to claim 5, characterized in that: The first recess includes a first annular cavity and a second annular cavity that are connected to each other, and the inner diameter of the first annular cavity is smaller than the inner diameter of the second annular cavity.

7. The battery cell according to claim 6, characterized in that: The second connecting member includes a main body and an annular protrusion protruding from the main body, the annular protrusion is embedded in the first annular cavity, and the main body is embedded in the second annular cavity and is welded to the circumferential side wall of the second annular cavity.

8. The battery cell according to claim 1, characterized in that: A second recess is formed on a side of the first connecting member away from the electrode ear, and a portion of the electrode lead-out portion is accommodated in the second recess.

9. A battery device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 8.

10. An electrical device, characterized in that: Comprising the battery device as claimed in claim 9, the battery device is used to provide electrical energy.

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