Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery cell includes a housing, an electrode assembly, an electrode terminal, a current collecting member, and an insulator. The electrode assembly is accommodated in the housing, and the electrode assembly is provided with a tab. The electrode terminal is disposed on the housing wall portion. The current collecting member is provided between the wall portion and the electrode assembly. The insulator is provided on a side of the wall portion facing the electrode assembly to insulate and isolate the wall portion and the current collecting member. The current collecting component comprises a first connecting area, a transition area and a second connecting area, the transition area is connected with the first connecting area and the second connecting area, the first connecting area is connected with the electrode terminal, the second connecting area is connected with the tab, and a reinforcing part is convexly arranged on at least one side of the transition area along the thickness direction of the wall part. The structural strength of the transition area can be enhanced through the reinforcing part, and the phenomenon that the second connecting area deforms relative to the first connecting area in the using process and is short-circuited due to lap joint of the wall part is relieved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Art

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of stability and reliability in use.

[0003] In battery technology, in order to reduce the assembly difficulty of battery cells, current collectors are usually set inside the casing of the battery cell to connect the electrode terminals of the battery cell and the tabs of the electrode assembly. However, existing battery cells are prone to the risk of current collectors and casings overlapping during use, which may cause short circuits in the battery cell, or even cause fires or explosions, thus hindering the improvement of the reliability of the battery cells. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device, which can effectively improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing, an electrode assembly, electrode terminals, a current collector, and an insulating member; the housing has a wall portion; the electrode assembly is housed within the housing and has tabs; the electrode terminals are disposed on the wall portion; the current collector is disposed between the wall portion and the electrode assembly, and the current collector is electrically connected to the electrode assembly and the electrode terminals; the insulating member is disposed on the side of the wall portion facing the electrode assembly to insulate and isolate the wall portion and the current collector; wherein, the current collector includes a first connection region, a transition region, and a second connection region, the transition region connecting the first connection region and the second connection region, the first connection region connecting the electrode terminals, the second connection region connecting the tabs, and a reinforcing portion protruding from at least one side of the transition region along the thickness direction of the wall portion.

[0006] In the above technical solution, the current collector has a first connection area, a transition area, and a second connection area connected in sequence. The first connection area is connected to the electrode terminal, and the second connection area is connected to the tab of the electrode assembly to realize the electrical connection between the electrode assembly and the electrode terminal. By providing a reinforcing part on at least one side of the transition area of ​​the current collector, the reinforcing part can strengthen the structural strength of the transition area, which helps to alleviate the phenomenon of deformation of the second connection area relative to the first connection area during use. This effectively alleviates the phenomenon of the second connection area overlapping with the wall after deformation relative to the first connection area under the squeezing action of the electrode assembly when the battery cell experiences thermal runaway or the insulating part melts due to high temperature during use. This reduces the risk of short circuit between the current collector and the wall, thereby effectively reducing the risk of internal short circuit or fire and explosion caused by short circuit in the battery cell during use, and improving the reliability of the battery cell.

[0007] In some embodiments, along the thickness direction of the wall portion, one side of the transition region is provided with the reinforcing portion, and the other side is provided with a first groove corresponding to the position of the reinforcing portion.

[0008] In the above technical solution, by forming a groove on the side of the transition zone away from the reinforcing part and corresponding to the position of the reinforcing part, the transition zone has a structure in which a reinforcing part is formed on one side and a groove is formed on the other side. The current collector with this structure can form a reinforcing part on the transition zone through a stamping process, which helps to reduce the forming difficulty of the reinforcing part on the transition zone. On the other hand, the transition zone has a locally arched structure, which helps to further increase the structural strength of the transition zone, thereby further reducing the phenomenon of deformation of the second connection zone relative to the first connection zone during use. Thus, after the insulating part is melted at high temperature, it can further alleviate the phenomenon of the second connection zone deforming relative to the first connection zone under the squeezing action of the electrode assembly and overlapping with the wall, thereby reducing the risk of short circuit between the current collector and the wall.

[0009] In some embodiments, the first connecting region, the transition region, and the second connecting region are arranged along a first direction, the first groove extends along a second direction and penetrates at least one end of the transition region, and the first direction, the second direction, and the thickness direction of the wall are perpendicular to each other.

[0010] In the above technical solution, by setting the extension direction of the first groove to be perpendicular to the arrangement direction of the first connecting area, the transition area and the second connecting area, and the first groove extending to the edge of at least one end of the transition area in the second direction, on the one hand, the structural strength and deformation resistance of the transition area can be increased by the locally arched structure of the transition area, so as to further reduce the phenomenon of deformation of the second connecting area relative to the first connecting area during use. In addition, after the insulating part is melted at high temperature, the phenomenon of the second connecting area overlapping with the wall after deformation relative to the first connecting area under the squeezing action of the electrode assembly can be further alleviated, so as to further reduce the risk of short circuit between the current collector and the wall. On the other hand, the first groove can be processed from the edge of one end of the transition area in the second direction, which helps to reduce the forming difficulty of the first groove and the reinforcing part, thereby reducing the manufacturing difficulty of the current collector.

[0011] In some embodiments, along the second direction, the first groove extends through both ends of the transition region.

[0012] In the above technical solution, by setting the first groove to extend through both ends of the transition zone in the second direction, the first groove extends to both sides of the transition zone in the second direction. This makes the reinforcing part extend along the second direction and extend to the edge of the transition zone in both ends. On the one hand, this can further increase the structural strength and deformation resistance of the transition zone, thereby further reducing the phenomenon of deformation of the second connection area relative to the first connection area during use. In addition, after the insulating part is melted at high temperature, it can further alleviate the phenomenon of the second connection area deforming relative to the first connection area under the squeezing action of the electrode assembly and overlapping with the wall, thereby further reducing the risk of short circuit between the current collector and the wall. On the other hand, the first groove can be processed from the edge of both ends of the transition zone in the second direction, which is conducive to further reducing the forming difficulty of the first groove and the reinforcing part, thereby further reducing the manufacturing difficulty of the current collector.

[0013] In some embodiments, the first connection region, the transition region, and the second connection region are arranged along a first direction, and along a second direction, the second connection region has an overhang portion extending beyond one end of the transition region, the overhang portion being connected to the electrode tab, and the first direction, the second direction, and the thickness direction of the wall portion are perpendicular to each other.

[0014] In the above technical solution, the first connection area, the transition area and the second connection area are arranged and connected along the first direction. By setting the second connection area to extend beyond the transition area along the second direction and connecting the extended part of the second connection area beyond the transition area in the second direction to the electrode tab, the connection difficulty between the second connection area and the electrode tab can be reduced and the connection area between the second connection area and the electrode tab can be increased, thereby reducing the assembly difficulty of the battery cell.

[0015] In some embodiments, the first connecting region, the transition region, and the second connecting region are arranged along a first direction, the size of the reinforcing portion in the second direction is larger than the size of the reinforcing portion in the first direction, and the first direction, the second direction, and the thickness direction of the wall portion are perpendicular to each other.

[0016] In the above technical solution, the first connection area, the transition area, and the second connection area are arranged and connected along the first direction. By setting the size of the reinforcing part in the second direction to be larger than the size of the reinforcing part in the first direction, the reinforcing part is a strip structure extending along the second direction, and the extension direction of the reinforcing part is a structure perpendicular to the arrangement direction of the first connection area, the transition area, and the second connection area. This can increase the structural strength and deformation resistance of the transition area, thereby reducing the phenomenon of deformation of the second connection area relative to the first connection area during use. Furthermore, after the insulating part is melted at high temperature, it can further alleviate the phenomenon of the second connection area overlapping with the wall after deformation relative to the first connection area under the squeezing action of the electrode assembly, thereby further reducing the risk of short circuit between the current collector and the wall.

[0017] In some embodiments, along the second direction, the two ends of the reinforcing portion extend to the two ends of the transition region, respectively.

[0018] In the above technical solution, by setting the reinforcing part to extend to the edges of the transition area at both ends in the second direction, the reinforcing part can strengthen the entire area of ​​the transition area in the second direction. This helps to further reduce the deformation of the second connection area relative to the first connection area during use. After the insulating part is melted at high temperature, it can further alleviate the phenomenon of the second connection area deforming relative to the first connection area under the squeezing action of the electrode assembly and overlapping with the wall, so as to further reduce the risk of short circuit between the current collector and the wall.

[0019] In some embodiments, along the first direction, the width of the reinforcing portion is W, satisfying that 1mm≤W≤10mm.

[0020] In the above technical solution, the width of the reinforcing part in the first direction is 1mm to 10mm. On the one hand, setting the width of the reinforcing part in the first direction to be greater than or equal to 1mm can improve the reinforcing effect of the reinforcing part on the transition area, thereby improving the structural strength and deformation resistance of the transition area. This is beneficial to reducing the phenomenon of the second connection area overlapping and short-circuiting with the wall after deformation relative to the first connection area during use. On the other hand, setting the width of the reinforcing part in the first direction to be less than or equal to 10mm can alleviate the phenomenon of the reinforcing part occupying too much space, thereby optimizing the size of the transition area in the first direction. This can save the space occupied by the current collector in the casing and is beneficial to improving the energy density of the battery cell.

[0021] In some embodiments, along the first direction, the width of the reinforcing portion is W, satisfying 1.5mm≤W≤8mm.

[0022] In the above technical solution, the width of the reinforcing part in the first direction is 1.5mm to 8mm. On the one hand, setting the width of the reinforcing part in the first direction to be greater than or equal to 1.5mm can further improve the reinforcing effect of the reinforcing part on the transition area, thereby further improving the structural strength and deformation resistance of the transition area. This is beneficial to further reduce the phenomenon of the second connection area overlapping and short-circuiting with the wall after deformation relative to the first connection area during use. On the other hand, setting the width of the reinforcing part in the first direction to be less than or equal to 8mm can further alleviate the phenomenon of the reinforcing part occupying too much space, thereby further optimizing the size of the transition area in the first direction. This can further save the space occupied by the current collector in the casing, which is beneficial to improving the energy density of the battery cell.

[0023] In some embodiments, along the thickness direction of the wall portion, a connecting portion is provided on the side of the first connecting area facing the wall portion, and the connecting portion is connected to the electrode terminal; wherein, along the first direction, the minimum distance between the reinforcing portion and the connecting portion is L1, satisfying 1mm≤L1≤10mm.

[0024] In the above technical solution, by providing a connecting part protruding on the side of the first connecting area facing the wall, and connecting part being connected to the electrode terminal, the first connecting area is structured to be connected to the electrode terminal through the connecting part. This helps to reduce the connection difficulty between the first connecting area and the electrode terminal. Specifically, by setting the minimum distance between the reinforcing part on the transition area and the connecting part on the first connecting area in the first direction to 1mm to 10mm, on the one hand, setting the minimum distance between the reinforcing part and the connecting part in the first direction to be greater than or equal to 1mm can alleviate the mutual influence and stress concentration of the reinforcing part and the connecting part during the molding process, thereby reducing the manufacturing difficulty of the current collector and improving the production quality of the current collector. On the other hand, setting the minimum distance between the reinforcing part and the connecting part in the first direction to be less than or equal to 10mm can alleviate the phenomenon of excessive space occupied by the reinforcing part and the connecting part in the first direction, thereby optimizing the size of the transition area and the first connecting area in the first direction, thus saving the space occupied by the current collector in the casing and improving the energy density of the battery cell.

[0025] In some embodiments, along the first direction, the minimum distance between the reinforcing portion and the connecting portion is L1, satisfying that 2mm≤L1≤8mm.

[0026] In the above technical solution, by setting the minimum distance between the reinforcing part on the transition zone and the connecting part on the first connecting zone in the first direction to 2mm to 8mm, on the one hand, setting the minimum distance between the reinforcing part and the connecting part in the first direction to be greater than or equal to 2mm can further alleviate the mutual influence and stress concentration of the reinforcing part and the connecting part during the molding process, thereby further reducing the manufacturing difficulty of the current collector and further improving the production quality of the current collector. On the other hand, setting the minimum distance between the reinforcing part and the connecting part in the first direction to be less than or equal to 8mm can further alleviate the phenomenon of excessive space occupied by the reinforcing part and the connecting part in the first direction, thereby further optimizing the size of the transition zone and the first connecting zone in the first direction, thereby further saving the space occupied by the current collector in the casing, which is beneficial to improving the energy density of the battery cell.

[0027] In some embodiments, the second connection region has a first end in the first direction that is away from the first connection region; wherein, along the first direction, the minimum distance between the reinforcing portion and the first end is L2, satisfying 1mm≤L2≤10mm.

[0028] In the above technical solution, by setting the minimum distance between the reinforcing part and the first end of the second connecting area away from the first connecting area in the first direction to 1mm to 10mm, on the one hand, setting the minimum distance between the reinforcing part and the first end in the first direction to be greater than or equal to 1mm can alleviate the phenomenon of excessive molding difficulty of the reinforcing part, thereby reducing the difficulty of setting the reinforcing part in the transition area between the first connecting area and the second connecting area. On the other hand, setting the minimum distance between the reinforcing part and the first end in the first direction to be less than or equal to 10mm can make the edge of the second connecting area in the first direction closer to the reinforcing part, thereby improving the deformation resistance of the second connecting area relative to the first connecting area, and alleviating the phenomenon of short circuit between the second connecting area and the wall after deformation relative to the first connecting area during use.

[0029] In some embodiments, along the first direction, the minimum distance between the reinforcing portion and the first end is L2, satisfying 2mm≤L2≤8mm.

[0030] In the above technical solution, by setting the minimum distance between the reinforcing part and the first end of the second connecting area away from the first connecting area in the first direction to 2mm to 8mm, on the one hand, setting the minimum distance between the reinforcing part and the first end in the first direction to be greater than or equal to 2mm can further alleviate the phenomenon of excessive molding difficulty of the reinforcing part, so as to further reduce the difficulty of setting the reinforcing part in the transition area between the first connecting area and the second connecting area. On the other hand, setting the minimum distance between the reinforcing part and the first end in the first direction to be less than or equal to 8mm can make the edge of the second connecting area in the first direction closer to the reinforcing part, thereby further improving the deformation resistance of the second connecting area relative to the first connecting area, so as to further alleviate the phenomenon of short circuit with the wall after the second connecting area deforms relative to the first connecting area during use.

[0031] In some embodiments, the reinforcing portion protrudes from the side of the transition region facing the electrode assembly along the thickness direction of the wall portion.

[0032] In the above technical solution, by setting the reinforcing part as a transition zone facing the electrode assembly in the thickness direction of the wall, on the one hand, the interference between the reinforcing part and the wall and the insulating part can be reduced, which is beneficial to reducing the assembly difficulty of the current collector. On the other hand, the phenomenon of interference between the reinforcing part and the assembly connection between the first connection area and the electrode terminal can be reduced.

[0033] In some embodiments, the electrode assembly further includes a main body portion, and the tab is connected to one end of the main body portion facing the wall portion in the thickness direction of the wall portion; wherein, along the thickness direction of the wall portion, the reinforcing portion protrudes from the surface of the transition region facing the electrode assembly by a dimension D1, and the distance between the main body portion and the transition region is D2, satisfying that D2≥D1.

[0034] In the above technical solution, by setting the distance between the main body and the transition zone in the thickness direction of the wall to be greater than or equal to the height of the reinforcing part protruding from the side of the transition zone facing the electrode assembly, the interference between the reinforcing part and the main body of the electrode assembly can be reduced, which is beneficial to reducing the assembly difficulty of the battery cell and can effectively alleviate the phenomenon of damage to the reinforcing part or scratching the main body of the electrode assembly.

[0035] In some embodiments, along the thickness direction of the wall portion, the dimension of the reinforcing portion protruding from the surface of the transition region facing the electrode assembly is D1, satisfying that 1mm≤D1≤5mm.

[0036] In the above technical solution, the height of the reinforcing part protruding from the transition area in the thickness direction of the wall is 1mm to 5mm. On the one hand, by setting the height of the reinforcing part protruding from the transition area in the thickness direction of the wall to be greater than or equal to 1mm, the reinforcing part can enhance the reinforcing effect of the transition area, thereby improving the structural strength and deformation resistance of the transition area. This further reduces the phenomenon of the second connection area overlapping and short-circuiting with the wall after deformation relative to the first connection area during use. On the other hand, by setting the height of the reinforcing part protruding from the transition area in the thickness direction of the wall to be less than or equal to 5mm, the phenomenon of the reinforcing part occupying too much space in the thickness direction of the wall can be alleviated, thereby saving the space occupied by the current collector in the casing and improving the energy density of the battery cell.

[0037] In some embodiments, along the thickness direction of the wall portion, the distance between the main body portion and the transition zone is D2, which satisfies 3mm≤D2≤10mm.

[0038] In the above technical solution, the distance between the main body and the transition area in the thickness direction of the wall is 3mm to 10mm. On the one hand, by setting the distance between the main body and the transition area in the thickness direction of the wall to be greater than or equal to 3mm, sufficient space can be provided between the main body and the transition area to accommodate the reinforcing part, thereby alleviating the phenomenon that the height of the reinforcing part is limited due to insufficient distance between the main body and the transition area, and also alleviating the interference and scraping phenomenon between the reinforcing part and the main body. On the other hand, by setting the distance between the main body and the transition area in the thickness direction of the wall to be less than or equal to 10mm, the phenomenon that the space is wasted due to excessive gap between the main body and the transition area of ​​the current collector can be alleviated, thereby improving the internal space utilization rate of the battery cell.

[0039] In some embodiments, the thickness of the current collector is D3, satisfying 0.4mm≤D3≤2mm.

[0040] In the above technical solution, by setting the thickness of the current collecting component to 0.4mm to 2mm, on the one hand, setting the thickness of the current collecting component to be greater than or equal to 0.4mm makes the current collecting component have better structural strength and deformation resistance, which helps to alleviate the phenomenon of short circuit between the second connection area and the wall after deformation relative to the first connection area during use. On the other hand, setting the thickness of the current collecting component to be less than or equal to 2mm can save the space occupied by the current collecting component in the shell and reduce the phenomenon of excessive waste of the current collecting component or excessive difficulty in processing and forming.

[0041] In some embodiments, the battery cell includes a plurality of electrode assemblies, which are stacked along a first direction perpendicular to the thickness direction of the wall portion; wherein, the current collector includes two second connection regions, which are located on opposite sides of the first connection region in the first direction, and each second connection region is connected to the first connection region through a transition region, and each second connection region is connected to the tab of at least one of the electrode assemblies.

[0042] In the above technical solution, the current collector is provided with two second connection areas. The two second connection areas are located on both sides of the first connection area in the first direction. Each second connection area is connected to the first connection area through a transition area, and each second connection area is connected to the tab of at least one electrode assembly. This reduces the risk of short circuit when the two second connection areas overlap with the wall after deformation relative to the first connection area. At the same time, it enables multiple electrode assemblies stacked along the second direction to be connected to an electrode terminal after being combined through a current collector. This allows for the realization of a battery cell with a large capacity while reducing the risk of short circuit during battery cell use.

[0043] In some embodiments, along the thickness direction of the wall portion, the insulating member has a receiving groove on the side opposite to the wall portion, and the current collecting member is disposed in the receiving groove.

[0044] In the above technical solution, by providing a receiving groove for accommodating the current collector on the side of the insulating component away from the wall, the current collector can be accommodated in the receiving groove of the insulating component. The battery cell with this structure can, on the one hand, realize that the current collector and the insulating component share part of the space in the thickness direction of the wall, which is beneficial to improve the internal space utilization of the battery cell. On the other hand, it can realize the covering effect of the insulating component on the current collector, thereby improving the insulation isolation effect of the insulating component on the current collector and the wall, and also realizing the insulation isolation effect of the insulating component on the current collector and other components, which is beneficial to further reduce the risk of internal short circuits in the battery cell during use.

[0045] In some embodiments, the electrode assembly further includes a main body portion, the tab is connected to one end of the main body portion facing the wall portion in the thickness direction, and the insulating member is located between the wall portion and the main body portion; wherein, along the thickness direction of the wall portion, the insulating member abuts against the end of the main body portion where the tab is provided.

[0046] In the above technical solution, the tab is connected to the end of the main body of the electrode assembly facing the wall in the thickness direction of the wall, so that both the tab and the current collector are located at the end of the main body facing the wall, thereby reducing the connection difficulty between the tab and the current collector. In addition, by abutting the insulating member against the end of the main body where the tab is provided in the thickness direction of the wall, the insulating member and the electrode assembly can play a role in supporting and restricting each other within the housing, thereby reducing the risk of shaking or displacement of the insulating member and the electrode assembly during use.

[0047] In some embodiments, along the thickness direction of the wall portion, a connecting portion is provided on the side of the first connecting area facing the wall portion, and the connecting portion is connected to the electrode terminal; wherein, the insulating member is provided with a through hole, the through hole penetrates the insulating member along the thickness direction of the wall portion, and the connecting portion and / or the electrode terminal is inserted into the through hole.

[0048] In the above technical solution, by providing a connecting part protruding on the side of the first connection area facing the wall, and correspondingly providing through holes on the insulating member for inserting the connecting part and / or electrode terminals, the first connection area can be connected to the electrode terminals through the connecting part. The battery cell with this structure can improve the contact effect between the current collector and the electrode terminals, thereby improving the connection quality between the current collector and the electrode terminals.

[0049] In some embodiments, along the thickness direction of the wall portion, the first connecting area is away from the surface of the wall portion and a second groove is formed at the position corresponding to the connecting portion.

[0050] In the above technical solution, by forming a second groove on the surface of the first connection area away from the wall and at the position corresponding to the connection part, the connection part on the first connection area is a structure that can be formed by stamping process. The connection part and the second groove are formed on the surfaces on both sides of the first connection area, thereby effectively reducing the forming difficulty of the current collector component and improving the production efficiency of the battery cell.

[0051] In some embodiments, the housing includes a shell and an end cap; the interior of the shell has an opening in a receiving cavity in which the electrode assembly is received; the end cap closes the opening; wherein the end cap is the wall portion.

[0052] In the above technical solution, by setting the wall of the outer casing as an end cap for sealing the opening of the casing, the battery cell with this structure is easy to assemble the electrode terminals on the end cap, which helps to reduce the assembly difficulty of the electrode terminals and reduces the connection difficulty between the current collector and the electrode terminals, as well as between the current collector and the tab, thereby effectively reducing the assembly difficulty of the battery cell and improving the production efficiency of the battery cell.

[0053] In some embodiments, the housing includes a shell and an end cap; the shell includes an integrally formed sidewall and a bottom wall, the sidewall surrounding the bottom wall, one end of the sidewall being connected to the bottom wall along the thickness direction of the wall portion, and the other end forming an opening, the sidewall and the bottom wall together defining a receiving cavity, the electrode assembly being received within the receiving cavity; the end cap closes the opening; wherein, the bottom wall is the wall portion.

[0054] In the above technical solution, by setting the wall of the outer casing as a wall opposite to the end cover in the thickness direction of the wall, the battery cell with this structure can make the wall with the electrode terminals far away from the end cover, so that there is no direct connection between the wall and the end cover. This can alleviate the phenomenon that the force generated when the electrode terminals pull or twist the wall acts on the end cover, thereby reducing the risk of connection failure between the end cover and the casing, and thus helping to reduce the leakage risk of the battery cell during use.

[0055] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0056] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell, wherein the battery cell is used to provide electrical energy. Attached Figure Description

[0057] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0059] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0060] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0061] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0062] Figure 5 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0063] Figure 6 for Figure 5 A magnified view of part A of the shown battery cell;

[0064] Figure 7 This is a schematic diagram of the structure of the current collection component provided in some embodiments of this application;

[0065] Figure 8 A front view of a flow-collecting member in the thickness direction of the wall portion, provided for some embodiments of this application;

[0066] Figure 9 Cross-sectional views of current collection components provided in some embodiments of this application;

[0067] Figure 10 This is a schematic diagram of the structure of an insulating element provided in some embodiments of this application.

[0068] Icons: 1000 - Vehicle; 100 - Battery assembly; 10 - Housing; 11 - First housing body; 12 - Second housing body; 20 - Battery cell; 21 - Housing; 211 - Wall; 212 - Housing; 2121 - Opening; 213 - End cap; 22 - Electrode assembly; 221 - Main body; 222 - Tab; 23 - Electrode terminal; 24 - Current collector; 241 - First connection area; 2411 - Connection part; 2412 - Second groove; 242 - Transition area; 2421 - Reinforcing part; 2422 - First groove; 243 - Second connection area; 2431 - Excess part; 2432 - First end; 25 - Insulator; 251 - Receiving groove; 252 - Through hole; 26 - Pressure relief component; 200 - Controller; 300 - Motor; X - Thickness direction of the wall; Y - First direction; Z - Second direction. DETAILED DESCRIPTION

[0069] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0070] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0071] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0072] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0073] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0074] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0075] In this application, "multiple" means two or more (including two).

[0076] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0077] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0078] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0079] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0080] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0081] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0082] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05At least one of O2 and its modified compounds.

[0083] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0084] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0085] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0086] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0087] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0088] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0089] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0090] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0091] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0092] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0093] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0094] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0095] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0096] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0097] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0098] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0099] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0100] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0101] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0102] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0103] In some implementations, the electrode assembly has a stacked structure.

[0104] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0105] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0106] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0107] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0108] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0109] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0110] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0111] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0112] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0113] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0114] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0115] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0116] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0117] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0118] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0119] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0120] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0121] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0122] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0123] For a typical battery cell, it includes a casing, electrode assembly, and electrode terminals mounted on the casing. To reduce assembly difficulty, a current collector is usually placed inside the casing. This current collector connects the electrode terminals and the tabs of the electrode assembly, simplifying assembly. Furthermore, to mitigate the risk of short circuits between the current collector and the casing, an insulating structure, such as a plastic insert, is typically placed between them to reduce the risk of internal short circuits. However, battery cells experience temperature increases during use, especially during thermal runaway. The high internal temperature can cause the insulating structure, such as the plastic insert, between the current collector and the casing to melt. Under the pressure of the electrode assembly, the area of ​​the current collector that connects to the tabs is prone to deformation relative to the area that connects to the electrode terminals. This deformation can lead to direct contact with the casing, significantly increasing the risk of internal short circuits within the battery cell. This can even result in fires or explosions, negatively impacting the reliability of the battery cell.

[0124] Based on the above considerations, in order to solve the problem of low reliability in the use of battery cells, this application provides a battery cell including a casing, an electrode assembly, electrode terminals, a current collector, and an insulating member. The casing has a wall. The electrode assembly is housed within the casing and has tabs. The electrode terminals are disposed on the wall. The current collector is disposed between the wall and the electrode assembly, and the current collector is electrically connected to the electrode assembly and the electrode terminals. The insulating member is disposed on the side of the wall facing the electrode assembly to insulate and isolate the wall and the current collector. The current collector includes a first connection region, a transition region, and a second connection region. The transition region connects the first connection region and the second connection region. The first connection region connects to the electrode terminals, and the second connection region connects to the tabs. Along the thickness direction of the wall, at least one side of the transition region has a protruding reinforcing portion.

[0125] In this type of battery cell, the current collector has a first connection area, a transition area, and a second connection area connected in sequence. The first connection area is connected to the electrode terminals, and the second connection area is connected to the tabs of the electrode assembly to achieve electrical connection between the electrode assembly and the electrode terminals. By providing a reinforcing portion on at least one side of the transition area of ​​the current collector, the reinforcing portion can strengthen the structural strength of the transition area, which helps to mitigate the deformation of the second connection area relative to the first connection area during use. This effectively mitigates the phenomenon of the second connection area overlapping with the wall after deformation relative to the first connection area under the squeezing action of the electrode assembly when the battery cell experiences thermal runaway or the insulating component melts due to high temperature during use. This reduces the risk of short circuit between the current collector and the wall, thereby effectively reducing the risk of internal short circuit or fire and explosion caused by short circuit during use, and improving the reliability of the battery cell.

[0126] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be composed of battery cells and battery devices disclosed in this application. This helps to mitigate the problem of internal short circuits or fires and explosions occurring in battery cells during use, thereby improving the reliability of the battery cells.

[0127] This application provides an electrical device that uses a single battery cell or battery assembly as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0128] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0129] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0130] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0131] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, which are housed within the housing 10.

[0132] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0133] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0134] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form battery modules, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0135] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0136] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 20 has a cuboid structure.

[0137] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , Figure 4 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Figure 5 This is a cross-sectional view of a battery cell 20 provided in some embodiments of this application. Figure 6 for Figure 5 A magnified view of part A of the battery cell 20 shown. Figure 7 This is a schematic diagram of the structure of the current collection component 24 provided in some embodiments of this application. Figure 8 This is a front view of the flow collection member 24 provided in some embodiments of this application in the thickness direction X of the wall. Figure 9This is a cross-sectional view of a current collector 24 provided in some embodiments of this application. This application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, electrode terminals 23, a current collector 24, and an insulator 25. The housing 21 has a wall portion 211. The electrode assembly 22 is housed within the housing 21 and has tabs 222. The electrode terminals 23 are disposed on the wall portion 211. The current collector 24 is disposed between the wall portion 211 and the electrode assembly 22, and the current collector 24 electrically connects the electrode assembly 22 and the electrode terminals 23. The insulator 25 is disposed on the side of the wall portion 211 facing the electrode assembly 22 to insulate and isolate the wall portion 211 and the current collector 24. The current collector 24 includes a first connection area 241, a transition area 242, and a second connection area 243. The transition area 242 connects the first connection area 241 and the second connection area 243. The first connection area 241 connects to the electrode terminal 23, and the second connection area 243 connects to the tab 222. Along the thickness direction X of the wall, at least one side of the transition area 242 is provided with a reinforcing part 2421.

[0138] The outer shell 21 can also be used to contain electrolytes, such as electrolyte solution. The outer shell 21 can have various structural forms, such as a cylinder or a cuboid. Similarly, the outer shell 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0139] In some embodiments, the housing 21 can be a sealed structure or a non-sealed structure. As an example, when the housing 21 is a sealed structure, it can protect the electrode assembly 22 and prevent, to some extent, electrolyte leakage. When the housing 21 is a non-sealed structure, it can still protect the electrode assembly 22, and a sealing bag may be included between the housing 21 and the electrode assembly 22. The sealing bag is used to encapsulate the electrode assembly 22 and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0140] Optionally, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity for accommodating the electrode assembly 22 and has an opening 2121. That is, the housing 212 is a hollow structure with an opening 2121 at one end. The end cap 213 covers the opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0141] It should be noted that the wall portion 211 for mounting the electrode terminal 23 can be the end cap 213 of the housing 21, or it can be a wall of the housing 212 of the housing 21. For example, in... Figure 3In this embodiment, the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 211 can also be the bottom wall of the housing 212 and the end cap 213 that are disposed opposite to each other, or the wall portion 211 can also be the side wall of the housing 212 and the end cap 213 that are adjacent to each other and connected to each other.

[0142] When assembling the battery cell 20, the electrode assembly 22 can be placed into the housing 212 first, and the electrolyte can be filled into the housing 212. Then, the end cap 213 can be closed onto the opening 2121 of the housing 212 to complete the assembly of the battery cell 20.

[0143] The housing 212 can have various shapes, such as a cylinder, cuboid, or prism. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylinder, a cylindrical housing 212 can be used; if the electrode assembly 22 is a cuboid, a cuboid housing 212 can be used. Of course, the end cap 213 can also have various structures, such as a plate-like structure or a hollow structure open at one end. For example, in… Figure 3 In the middle, the shell 212 has a cuboid structure.

[0144] Of course, it is understandable that the outer casing 21 is not limited to the structure described above. The outer casing 21 can also be other structures. For example, the outer casing 21 can include a housing 212 and two end caps 213. The housing 212 is a hollow structure with openings 2121 on opposite sides. One end cap 213 is fitted onto one opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the housing 212 has openings 2121 on opposite sides, and the two end caps 213 are fitted onto the opposite sides of the housing 212 to close the corresponding openings 2121.

[0145] It should be noted that the electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. The structure of the electrode assembly 22 can be various. For example, the electrode assembly 22 can be a wound structure formed by winding the positive electrode, the separator and the negative electrode, or a stacked structure formed by arranging the positive electrode, the separator and the negative electrode in layers.

[0146] For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0147] The electrode assembly 22 includes a main body 221 and tabs 222. The main body 221 is the main component of the electrode assembly 22 that undergoes electrochemical reactions within the battery cell 20. For example, in... Figure 4 and Figure 5In the middle, the electrode tab 222 is connected to one end of the main body 221 facing the wall 211 in the thickness direction X of the wall portion, that is, in the thickness direction X of the wall portion, the electrode tab 222 is located between the main body 221 and the wall portion 211, so that the electrode tab 222 can be connected to the electrode terminal 23 through the current collector 24.

[0148] It should be noted that the tabs 222 of the electrode assembly 22 are formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer, or by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer. If the tabs 222 are used for the positive electrode of the output electrode assembly 22, then the tabs 222 are formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer; if the tabs 222 are used for the negative electrode of the output electrode assembly 22, then the tabs 222 are formed by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer.

[0149] Optionally, the electrode assembly 22 housed within the housing 21 can be one or more. For example, in... Figure 4 In the battery cell 20, the outer casing 21 is provided with multiple electrode assemblies 22. The multiple electrode assemblies 22 are stacked along the first direction Y. When multiple electrode assemblies 22 are provided in the outer casing 21 of the battery cell 20, the number of electrode assemblies 22 can be two, three, four, five or six, etc.

[0150] Among them, the first direction Y, the second direction Z and the thickness direction X of the wall are perpendicular to each other. The thickness direction X of the wall is also the height direction of the battery cell 20, the first direction Y is also the thickness direction of the battery cell 20, and the second direction Z is also the length direction of the battery cell 20.

[0151] The electrode terminal 23 serves to electrically connect to the electrode assembly 22, acting as the output or input terminal of the battery cell 20, thereby enabling the output or input of electrical energy from the battery cell 20.

[0152] For example, the electrode terminal 23 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0153] In this embodiment, the electrode terminal 23 is insulated and mounted on the wall portion 211, that is, no electrical connection is formed between the electrode terminal 23 and the wall portion 211 of the housing 21.

[0154] Among them, Figure 3 and Figure 4In the battery cell 20, there are two electrode terminals 23. Correspondingly, each electrode assembly 22 has two tabs 222. The two tabs 222 are connected to one end of the main body 221 facing the wall 211 in the thickness direction X of the wall. The two tabs 222 have opposite polarities and are spaced apart along the second direction Z. That is, the two tabs 222 are the positive and negative terminals of the input or output electrode assembly 22, respectively. The two electrode terminals 23 are electrically connected to the two tabs 222 of the electrode assembly 22, respectively, so as to realize the input or output of the positive and negative terminals of the battery cell 20.

[0155] The structure in which the electrode terminal 23 is mounted on the housing 21 can be varied. For example, in... Figure 3 and Figure 4 In this embodiment, two electrode terminals 23 are spaced apart along the second direction Z on the wall portion 211 of the outer casing 21, that is, two electrode terminals 23 are spaced apart along the second direction Z on the end cap 213 of the outer casing 21. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the two electrode terminals 23 may also be mounted on the housing 212 of the outer casing 21. Similarly, the two electrode terminals 23 may also be mounted on the housing 212 of the outer casing 21 and on the end cap 213 of the outer casing 21.

[0156] In this embodiment, the current collector 24 is disposed between the wall portion 211 and the main body portion 221 of the electrode assembly 22 in the thickness direction X of the wall portion. That is, the wall portion 211, the current collector 24 and the main body portion 221 are arranged sequentially along the thickness direction X of the wall portion to facilitate the connection between the tab 222 of the electrode assembly 22 and the electrode terminal 23 disposed on the wall portion 211. The current collector 24 serves to connect the electrode terminal 23 and the tab 222 of the electrode assembly 22 to realize the electrical connection between the electrode terminal 23 and the electrode assembly 22, thereby reducing the connection difficulty between the electrode terminal 23 and the tab 222 of the electrode assembly 22.

[0157] For example, the material of the current collector 24 can be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0158] exist Figure 4 In the battery cell 20, there may be two current collectors 24. Both current collectors 24 are disposed inside the housing 21 and are arranged at intervals along the second direction Z. Each current collector 24 is connected to an electrode terminal 23 and a tab 222 of the same polarity in a plurality of electrode assemblies 22, so as to output or input the positive and negative electrodes of the electrode assembly 22 respectively.

[0159] The current collection component 24 includes a first connecting region 241, a transition region 242, and a second connecting region 243. The transition region 242 connects the first connecting region 241 and the second connecting region 243. That is, the current collection component 24 includes at least three parts: the first connecting region 241, the transition region 242, and the second connecting region 243. The transition region 242 is located between the first connecting region 241 and the second connecting region 243. The first connecting region 241 and the second connecting region 243 are connected through the transition region 242.

[0160] For example, in Figure 8 and Figure 9 In the structure, the first connecting region 241, the transition region 242 and the second connecting region 243 are arranged along the first direction Y, and the transition region 242 connects the first connecting region 241 and the second connecting region 243 in the first direction Y.

[0161] Optionally, the second connection area 243 of the current collection component 24 can be one or more, for example, in Figure 8 and Figure 9 In the current collector 24, two second connecting regions 243 are located on either side of the first connecting region 241 in the first direction Y. Correspondingly, the current collector 24 includes two transition regions 242, and each second connecting region 243 is connected to the first connecting region 241 through a transition region 242. Similarly, the first connecting region 241, the transition region 242, and the second connecting region 243 of the current collector 24 can be an integrally formed structure or a separate structure. For example, in... Figure 9 In the process, the first connecting area 241, the transition area 242, and the second connecting area 243 are integrally formed structures. The first connecting area 241, the transition area 242, and the second connecting area 243 can be manufactured by integral forming processes such as stamping, casting, or milling. Of course, in the case where the first connecting area 241, the transition area 242, and the second connecting area 243 are separate structures, the connection structure between the first connecting area 241, the transition area 242, and the second connecting area 243 can also be of various types, such as welding connection or snap-fit ​​connection.

[0162] The first connection area 241 is connected to the electrode terminal 23, and the second connection area 243 is connected to the tab 222. That is, the first connection area 241 of the current collector 24 is the part of the current collector 24 used to connect with the electrode terminal 23, while the second connection area 243 of the current collector 24 is the part of the current collector 24 used to connect with the tab 222.

[0163] Optionally, the connection structure between the first connection area 241 and the electrode terminal 23 and between the second connection area 243 and the tab 222 can be various, such as welding connection or abutment connection.

[0164] A reinforcing portion 2421 is provided on at least one side of the transition region 242, that is, a reinforcing portion 2421 is provided on at least one side of the surface of the transition region 242 in the thickness direction X of the wall, and the reinforcing portion 2421 is a structure that protrudes from one side of the surface of the transition region 242.

[0165] For example, the transition region 242 has a reinforcing portion 2421 on the surface of the wall portion facing the electrode assembly 22 in the thickness direction X. Of course, in other embodiments, the transition region 242 may also have a reinforcing portion 2421 on the surface of the wall portion facing the wall portion 211 in the thickness direction X, or it may have a reinforcing portion 2421 on both sides of the surface.

[0166] Optionally, the reinforcing part 2421 and the transition area 242 can be an integrally formed structure or a separate structure. For example, in Figure 9 In this design, the reinforcing portion 2421 and the transition region 242 are integrally formed. The reinforcing portion 2421 is formed by stamping the transition region 242, so that the reinforcing portion 2421 is formed on one side surface of the transition region 242, and a first groove 2422 is formed on the other side surface at the position corresponding to the reinforcing portion 2421, so that the transition region 242 is partially arched to form the reinforcing portion 2421. Of course, in other embodiments, the reinforcing portion 2421 and the transition region 242 can also be separate structures. For example, the reinforcing portion 2421 can be connected to one side surface of the transition region 242 by means of welding or other structures.

[0167] In this embodiment, the insulating member 25 is disposed inside the housing 21, and at least a portion of the insulating member 25 is disposed between the wall portion 211 and the current collecting member 24 in the thickness direction X of the wall portion to insulate and isolate the wall portion 211 and the current collecting member 24, so that the insulating member 25 can perform the function of insulating and isolating the wall portion 211 and the current collecting member 24, and the second connection area 243 of the current collecting member 24 is spaced apart from the wall portion 211 in the thickness direction X of the wall portion.

[0168] Among them, reference Figure 4 , Figure 5 and Figure 6 Please refer to further details. Figure 10 , Figure 10The diagram below shows the structure of the insulating member 25 provided in some embodiments of this application. In the thickness direction X of the wall, the side of the insulating member 25 facing away from the wall 211 abuts against the end of the main body 221 of the electrode assembly 22 where the tab 222 is provided. The side of the insulating member 25 facing away from the wall 211 is provided with a receiving groove 251. The receiving groove 251 is provided one-to-one with the current collector 24. The current collector 24 is accommodated in the receiving groove 251, and at least a portion of the tab 222 is accommodated in the receiving groove 251. This allows the tab 222, the current collector 24, and the insulating member 25 to share a portion of the space in the thickness direction X of the wall, thereby improving the internal space utilization of the battery cell 20 and improving the insulation and isolation effect of the insulating member 25 on the current collector 24 and the wall 211. In addition, the insulating member 25 can also effectively insulate and isolate the two current collectors 24 disposed in the housing 21 to reduce the risk of overlap between the two current collectors 24.

[0169] For example, the insulating element 25 can be made of various materials, such as rubber or plastic.

[0170] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may further include a pressure relief component 26, which is disposed on the end cap 213. The pressure relief component 26 is used to release the internal pressure of the battery cell 20 when the internal pressure or temperature reaches a predetermined value. Of course, in other embodiments, the pressure relief component 26 may also be disposed on the housing 212.

[0171] Optionally, the pressure relief component 26 and the end cap 213 can be an integrally formed structure or a separate structure. For example, in... Figure 4 In this embodiment, the pressure relief component 26 and the end cap 213 are separate structures. The pressure relief component 26 can be connected to the end cap 213 by welding or other means. Correspondingly, the pressure relief component 26 can be a component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve, or safety valve. Of course, in other embodiments, the pressure relief component 26 and the end cap 213 can also be an integrally formed structure. In this case, the pressure relief component 26 is an area on the end cap 213 with a weak structure, such as an area on the end cap 213 with a groove.

[0172] In this embodiment, the current collector 24 has a first connection region 241, a transition region 242, and a second connection region 243 connected in sequence. The first connection region 241 is connected to the electrode terminal 23, and the second connection region 243 is connected to the tab 222 of the electrode assembly 22 to realize the electrical connection between the electrode assembly 22 and the electrode terminal 23. A reinforcing portion 2421 is provided protruding on at least one side of the transition region 242 of the current collector 24, which strengthens the structural strength of the transition region 242 and helps to alleviate the stress on the second connection region 243 during use. The deformation of the first connection area 241 during the process can effectively mitigate the phenomenon of the second connection area 243 overlapping with the wall 211 after deformation relative to the first connection area 241 under the squeezing action of the electrode assembly 22, in the event of thermal runaway of the battery cell 20 or melting of the insulating component 25 due to high temperature during use. This reduces the risk of short circuit between the current collector 24 and the wall 211, thereby effectively reducing the risk of internal short circuit or fire and explosion caused by short circuit in the battery cell 20 during use, and improving the reliability of the battery cell 20.

[0173] According to some embodiments of this application, see Figure 7 and Figure 9 As shown, along the thickness direction X of the wall, a reinforcing part 2421 is provided on one side of the transition area 242, and a first groove 2422 is formed on the other side corresponding to the position of the reinforcing part 2421.

[0174] For example, the reinforcing portion 2421 protruding from one side of the transition region 242 is a structure formed by a stamping process, so that the reinforcing portion 2421 is formed on the surface of one side of the transition region 242, and a first groove 2422 is formed on the surface of the other side of the transition region 242, so that the transition region 242 is a reinforcing portion 2421 structure formed by a localized arching of the transition region 242. Of course, in other embodiments, the reinforcing portion 2421 may also be a structure formed by a localized thickening of the transition region 242.

[0175] In this embodiment, by forming a groove on the side of the transition region 242 away from the reinforcing part 2421 and corresponding to the position of the reinforcing part 2421, the transition region 242 has a structure in which the reinforcing part 2421 is formed on one side and the groove is formed on the other side. The current collector 24 with this structure can form the reinforcing part 2421 on the transition region 242 through a stamping process, which helps to reduce the forming difficulty of the reinforcing part 2421 on the transition region 242. On the other hand, the transition region 242 has a partially arched structure, which helps to further increase the structural strength of the transition region 242, so as to further reduce the phenomenon of deformation of the second connection region 243 relative to the first connection region 241 during use. Thus, after the insulating part 25 is melted at high temperature, it can further alleviate the phenomenon of the second connection region 243 deforming relative to the first connection region 241 under the squeezing action of the electrode assembly 22 and overlapping with the wall part 211, thereby reducing the risk of short circuit between the current collector 24 and the wall part 211.

[0176] According to some embodiments of this application, see Figure 7 , Figure 8 and Figure 9 As shown, the first connecting region 241, the transition region 242, and the second connecting region 243 are arranged along the first direction Y. The first groove 2422 extends along the second direction Z and penetrates at least one end of the transition region 242. The first direction Y, the second direction Z, and the thickness direction X of the wall are perpendicular to each other.

[0177] The first connecting region 241, the transition region 242, and the second connecting region 243 are arranged along the first direction Y, that is, the transition region 242 connects the first connecting region 241 and the second connecting region 243 in the first direction Y.

[0178] The first groove 2422 extends along the second direction Z and penetrates at least one end of the transition region 242. That is, the first groove 2422 extends along the second direction Z and at least one end of the first groove 2422 extends to the edge of the transition region 242 in the second direction Z. The first groove 2422 may only penetrate one end of the transition region 242 in the second direction Z, or the second groove 2412 may penetrate both ends of the transition region 242 in the second direction Z.

[0179] In this embodiment, by setting the extension direction of the first groove 2422 to be perpendicular to the arrangement direction of the first connecting area 241, the transition area 242, and the second connecting area 243, and by extending the first groove 2422 to the edge of at least one end of the transition area 242 in the second direction Z, on the one hand, the structural strength and deformation resistance of the transition area 242 can be increased by the locally arched structure of the transition area 242, so as to further reduce the phenomenon of deformation of the second connecting area 243 relative to the first connecting area 241 during use. In addition, after the insulating component 25 is melted at high temperature, the phenomenon of the second connecting area 243 overlapping with the wall portion 211 after deformation relative to the first connecting area 241 under the squeezing action of the electrode assembly 22 can be further alleviated, so as to further reduce the risk of short circuit between the current collector 24 and the wall portion 211. On the other hand, the first groove 2422 can be processed from the edge of one end of the transition area 242 in the second direction Z, which helps to reduce the molding difficulty of the first groove 2422 and the reinforcing portion 2421, thereby reducing the manufacturing difficulty of the current collector 24.

[0180] In some embodiments, please continue to see Figure 7 , Figure 8 and Figure 9 As shown, along the second direction Z, the first groove 2422 penetrates both ends of the transition region 242. That is, the two ends of the second groove 2412 in the second direction Z extend to the edges of the two ends of the transition region 242 in the second direction Z, respectively.

[0181] In this embodiment, by setting the first groove 2422 to extend through both ends of the transition region 242 in the second direction Z, the first groove 2422 extends to both sides of the transition region 242 in the second direction Z, so that the reinforcing part 2421 extends along the second direction Z and extends to the edge of the transition region 242 in both ends. On the one hand, this can further increase the structural strength and deformation resistance of the transition region 242, thereby further reducing the phenomenon of deformation of the second connecting region 243 relative to the first connecting region 241 during use. In addition, after the insulating part 25 is melted at high temperature, it can further alleviate the phenomenon of the second connecting region 243 overlapping with the wall part 211 after deformation relative to the first connecting region 241 under the squeezing action of the electrode assembly 22, thereby further reducing the risk of short circuit between the current collector 24 and the wall part 211. On the other hand, the first groove 2422 can be processed from the edge of both ends of the transition region 242 in the second direction Z, which is conducive to further reducing the molding difficulty of the first groove 2422 and the reinforcing part 2421, thereby further reducing the manufacturing difficulty of the current collector 24.

[0182] According to some embodiments of this application, see Figure 7 and Figure 8As shown, the first connecting region 241, the transition region 242 and the second connecting region 243 are arranged along the first direction Y and along the second direction Z. The second connecting region 243 has an overhang 2431 that extends beyond one end of the transition region 242. The overhang 2431 is connected to the tab 222. The first direction Y, the second direction Z and the thickness direction X of the wall are perpendicular to each other.

[0183] The second connecting region 243 and the transition region 242 are arranged and connected along the first direction Y. One end of the second connecting region 243 in the second direction Z is flush with one end of the transition region 242, while the other end of the second connecting region 243 in the second direction Z extends beyond the other end of the transition region 242. Correspondingly, the part of the second connecting region 243 that extends beyond is called the extension portion 2431, and the extension portion 2431 is the area of ​​the second connecting region 243 used to connect with the tab 222.

[0184] For example, the extended part 2431 is welded to the tab 222.

[0185] It should be noted that in the embodiment where the second connection area 243 includes the overhang 2431, by setting the first groove 2422 to extend along the second direction Z and penetrate through both ends of the transition area 242, the length direction of the first groove 2422 and the second connection area 243 can be aligned, which helps to further mitigate the risk of short circuit between the second connection area 243 and the wall portion 211 after the corresponding first connection area 241 is deformed.

[0186] In this embodiment, the first connection region 241, the transition region 242, and the second connection region 243 are arranged and connected along the first direction Y. By setting the second connection region 243 to extend beyond the transition region 242 along the second direction Z, and connecting the extended portion 2431 of the second connection region 243 extending beyond the transition region 242 in the second direction Z to the tab 222, the connection difficulty between the second connection region 243 and the tab 222 can be reduced, and the connection area between the second connection region 243 and the tab 222 can be increased, thereby reducing the assembly difficulty of the battery cell 20.

[0187] According to some embodiments of this application, see Figure 7 , Figure 8 and Figure 9 As shown, the first connecting region 241, the transition region 242, and the second connecting region 243 are arranged along the first direction Y. The size of the reinforcing part 2421 in the second direction Z is larger than the size of the reinforcing part 2421 in the first direction Y. The first direction Y, the second direction Z, and the thickness direction X of the wall are perpendicular to each other.

[0188] Among them, the size of the reinforcing part 2421 in the second direction Z is larger than the size of the reinforcing part 2421 in the first direction Y, that is, the reinforcing part 2421 is a strip structure extending along the second direction Z.

[0189] In this embodiment, the first connecting region 241, the transition region 242, and the second connecting region 243 are arranged and connected along the first direction Y. By setting the size of the reinforcing part 2421 in the second direction Z to be larger than the size of the reinforcing part 2421 in the first direction Y, the reinforcing part 2421 is a strip structure extending along the second direction Z, and the extension direction of the reinforcing part 2421 is perpendicular to the arrangement direction of the first connecting region 241, the transition region 242, and the second connecting region 243. This increases the structural strength and deformation resistance of the transition region 242, thereby reducing the phenomenon of deformation of the second connecting region 243 relative to the first connecting region 241 during use. Furthermore, after the insulating component 25 is melted at high temperature, it can further alleviate the phenomenon of the second connecting region 243 overlapping with the wall portion 211 after deformation relative to the first connecting region 241 under the squeezing action of the electrode assembly 22, thereby further reducing the risk of short circuit between the current collector 24 and the wall portion 211.

[0190] In some embodiments, see Figure 7 and Figure 8 As shown, along the second direction Z, both ends of the reinforcing portion 2421 extend to both ends of the transition region 242. That is, both ends of the reinforcing portion 2421 in the second direction Z extend to the edges of both ends of the transition region 242 in the second direction Z.

[0191] In this embodiment, by setting the reinforcing portion 2421 to extend to the edges of both ends of the transition region 242 in the second direction Z, the reinforcing portion 2421 can strengthen the entire area of ​​the transition region 242 in the second direction Z. This helps to further reduce the deformation of the second connection region 243 relative to the first connection region 241 during use. As a result, after the insulating member 25 is melted at high temperature, it can further alleviate the phenomenon that the second connection region 243 deforms relative to the first connection region 241 under the squeezing action of the electrode assembly 22 and overlaps with the wall portion 211, thereby further reducing the risk of short circuit between the current collector 24 and the wall portion 211.

[0192] According to some embodiments of this application, see Figure 9 As shown, along the first direction Y, the width of the reinforcing part 2421 is W, which satisfies 1mm≤W≤10mm.

[0193] It should be noted that in this embodiment of the application, the current collecting member 24 is provided with two second connection areas 243. Correspondingly, the current collecting member 24 has two transition areas 242, and each of the two transition areas 242 is provided with a reinforcing part 2421. The width W of the two reinforcing parts 2421 in the first direction Y can be the same or different.

[0194] In this embodiment, the width of the reinforcing part 2421 in the first direction Y is 1mm to 10mm. On the one hand, setting the width of the reinforcing part 2421 in the first direction Y to be greater than or equal to 1mm can improve the effect of the reinforcing part 2421 in reinforcing the transition region 242, thereby improving the structural strength and deformation resistance of the transition region 242. This is beneficial to reducing the phenomenon of the second connection region 243 overlapping and short-circuiting with the wall part 211 after deformation relative to the first connection region 241 during use. On the other hand, setting the width of the reinforcing part 2421 in the first direction Y to be less than or equal to 10mm can alleviate the phenomenon of the reinforcing part 2421 occupying too much space, thereby optimizing the size of the transition region 242 in the first direction Y. This can save the space occupied by the current collector 24 in the housing 21, which is beneficial to improving the energy density of the battery cell 20.

[0195] In some embodiments, please continue to see Figure 9 As shown, along the first direction Y, the width of the reinforcing part 2421 is W, which satisfies 1.5mm≤W≤8mm.

[0196] For example, the width W of the reinforcing part 2421 in the first direction Y can be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm or 8mm, etc.

[0197] In this embodiment, the width of the reinforcing part 2421 in the first direction Y is 1.5mm to 8mm. On the one hand, setting the width of the reinforcing part 2421 in the first direction Y to be greater than or equal to 1.5mm can further enhance the effect of the reinforcing part 2421 in reinforcing the transition region 242, thereby further improving the structural strength and deformation resistance of the transition region 242. This is beneficial to further reduce the phenomenon of the second connection region 243 overlapping and short-circuiting with the wall part 211 after deformation relative to the first connection region 241 during use. On the other hand, setting the width of the reinforcing part 2421 in the first direction Y to be less than or equal to 8mm can further alleviate the phenomenon of the reinforcing part 2421 occupying too much space, thereby further optimizing the size of the transition region 242 in the first direction Y. This can further save the space occupied by the current collector 24 in the housing 21, which is beneficial to improving the energy density of the battery cell 20.

[0198] According to some embodiments of this application, see Figure 7 , Figure 8 and Figure 9 As shown, along the thickness direction X of the wall portion, a connecting portion 2411 protrudes from the side of the first connecting area 241 facing the wall portion 211, and the connecting portion 2411 connects to the electrode terminal 23. Along the first direction Y, the minimum distance between the reinforcing portion 2421 and the connecting portion 2411 is L1, which satisfies 1mm≤L1≤10mm.

[0199] The connecting part 2411 is a convex structure on the first connecting area 241, and the first connecting area 241 is a structure that is connected to the electrode terminal 23 through the connecting part 2411. For example, the connecting part 2411 is welded to the electrode terminal 23.

[0200] In the same plane perpendicular to the thickness direction X of the wall, L1 is the minimum distance between the orthographic projection of the reinforcing part 2421 and the orthographic projection of the connecting part 2411 in the first direction Y.

[0201] In this embodiment, by providing a connecting portion 2411 protruding from the side of the first connecting area 241 facing the wall portion 211, and connecting portion 2411 being connected to the electrode terminal 23, the first connecting area 241 is structured to be connected to the electrode terminal 23 via connecting portion 2411. This helps to reduce the difficulty of connecting the first connecting area 241 and the electrode terminal 23. Specifically, by setting the minimum distance between the reinforcing portion 2421 on the transition area 242 and the connecting portion 2411 on the first connecting area 241 in the first direction Y to be 1mm to 10mm, the minimum distance between the reinforcing portion 2421 and the connecting portion 2411 in the first direction Y is set to be greater than or equal to 1mm. This can alleviate the mutual influence and stress concentration between the reinforcing part 2421 and the connecting part 2411 during the molding process, thereby reducing the manufacturing difficulty of the current collector 24 and improving the production quality of the current collector 24. On the other hand, setting the minimum distance between the reinforcing part 2421 and the connecting part 2411 in the first direction Y to less than or equal to 10mm can alleviate the phenomenon that the reinforcing part 2421 and the connecting part 2411 occupy too much space in the first direction Y, thereby optimizing the size of the transition area 242 and the first connecting area 241 in the first direction Y, thereby saving the space occupied by the current collector 24 in the housing 21, which is beneficial to improving the energy density of the battery cell 20.

[0202] In some embodiments, see Figure 9 As shown, along the first direction Y, the minimum distance between the reinforcing part 2421 and the connecting part 2411 is L1, which satisfies 2mm≤L1≤8mm.

[0203] For example, the minimum distance L1 between the reinforcing part 2421 and the connecting part 2411 in the first direction Y can be 2mm, 2.2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm or 8mm, etc.

[0204] In this embodiment, by setting the minimum distance between the reinforcing portion 2421 on the transition region 242 and the connecting portion 2411 on the first connecting region 241 in the first direction Y to 2mm to 8mm, on the one hand, setting the minimum distance between the reinforcing portion 2421 and the connecting portion 2411 in the first direction Y to be greater than or equal to 2mm can further alleviate the mutual influence and stress concentration of the reinforcing portion 2421 and the connecting portion 2411 during the molding process, thereby further reducing the manufacturing difficulty of the current collector 24 and further improving the production quality of the current collector 24. On the other hand, setting the minimum distance between the reinforcing portion 2421 and the connecting portion 2411 in the first direction Y to be less than or equal to 8mm can further alleviate the phenomenon of the reinforcing portion 2421 and the connecting portion 2411 occupying too much space in the first direction Y, thereby further optimizing the size of the transition region 242 and the first connecting region 241 in the first direction Y, thereby further saving the space occupied by the current collector 24 in the housing 21, which is beneficial to improving the energy density of the battery cell 20.

[0205] According to some embodiments of this application, see Figure 8 and Figure 9 As shown, the second connection region 243 has a first end 2432 in the first direction Y that is away from the first connection region 241. Along the first direction Y, the minimum distance between the reinforcing part 2421 and the first end 2432 is L2, which satisfies 1mm≤L2≤10mm.

[0206] Wherein, the first end 2432 is the edge of the second connection region 243 at the end away from the transition region 242 in the first direction Y.

[0207] In the same plane perpendicular to the thickness direction X of the wall, L2 is the minimum distance between the orthographic projection of the second connecting region 243 away from the end of the transition region 242 in the first direction Y and the orthographic projection of the reinforcing part 2421 in the first direction Y.

[0208] In this embodiment, by setting the minimum distance between the reinforcing part 2421 and the first end 2432 of the second connecting area 243 away from the first connecting area 241 in the first direction Y to 1mm to 10mm, on the one hand, setting the minimum distance between the reinforcing part 2421 and the first end 2432 in the first direction Y to be greater than or equal to 1mm can alleviate the phenomenon that the molding difficulty of the reinforcing part 2421 is too high, thereby reducing the difficulty of setting the reinforcing part 2421 in the transition area 242 between the first connecting area 241 and the second connecting area 243. On the other hand, setting the minimum distance between the reinforcing part 2421 and the first end 2432 in the first direction Y to be less than or equal to 10mm can make the edge of the second connecting area 243 in the first direction Y closer to the reinforcing part 2421, thereby improving the deformation resistance of the second connecting area 243 relative to the first connecting area 241, thereby alleviating the phenomenon that the second connecting area 243 overlaps and short-circuits with the wall part 211 after deformation relative to the first connecting area 241 during use.

[0209] In some embodiments, see Figure 9 As shown, along the first direction Y, the minimum distance between the reinforcing part 2421 and the first end 2432 is L2, which satisfies 2mm≤L2≤8mm.

[0210] For example, the minimum distance L2 between the reinforcing part 2421 and the first end 2432 in the first direction Y can be 2mm, 2.2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm or 8mm, etc.

[0211] In this embodiment, by setting the minimum distance between the reinforcing part 2421 and the first end 2432 of the second connecting area 243 away from the first connecting area 241 in the first direction Y to 2mm to 8mm, on the one hand, setting the minimum distance between the reinforcing part 2421 and the first end 2432 in the first direction Y to be greater than or equal to 2mm can further alleviate the phenomenon that the molding difficulty of the reinforcing part 2421 is too high, so as to further reduce the difficulty of setting the reinforcing part 2421 in the transition area 242 between the first connecting area 241 and the second connecting area 243. On the other hand, setting the minimum distance between the reinforcing part 2421 and the first end 2432 in the first direction Y to be less than or equal to 8mm can make the edge of the second connecting area 243 in the first direction Y closer to the reinforcing part 2421, thereby further improving the deformation resistance of the second connecting area 243 relative to the first connecting area 241, so as to further alleviate the phenomenon that the second connecting area 243 overlaps and short-circuits with the wall part 211 after deformation relative to the first connecting area 241 during use.

[0212] According to some embodiments of this application, see Figure 6 , Figure 7 and Figure 9 As shown, along the thickness direction X of the wall portion, the reinforcing portion 2421 protrudes from the side of the transition region 242 facing the electrode assembly 22. That is, the reinforcing portion 2421 is provided on the surface of the transition region 242 of the current collector 24 on the side of the wall portion facing the electrode assembly 22 in the thickness direction X.

[0213] It should be noted that in other embodiments, the reinforcing part 2421 may also be protruding on the side of the transition area 242 facing the wall part 211.

[0214] In this embodiment, by setting the reinforcing part 2421 as the transition region 242 on the side of the wall portion facing the electrode assembly 22 in the thickness direction X, the interference between the reinforcing part 2421 and the wall portion 211 and the insulating member 25 can be reduced, which is beneficial to reducing the assembly difficulty of the current collector 24. On the other hand, the interference of the reinforcing part 2421 on the assembly connection between the first connection region 241 and the electrode terminal 23 can be reduced.

[0215] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 6 As shown, the electrode assembly 22 also includes a main body 221, and an electrode tab 222 is connected to one end of the main body 221 facing the wall 211 in the thickness direction X of the wall. Along the thickness direction X of the wall, the reinforcing part 2421 protrudes from the surface of the transition region 242 facing the electrode assembly 22 by a dimension D1, and the distance between the main body 221 and the transition region 242 is D2, satisfying that D2≥D1.

[0216] Wherein, D1 is the height of the reinforcing part 2421 protruding from the surface of the transition region 242 facing the electrode assembly 22 in the thickness direction X of the wall, and D2 is the size of the gap between the main body part 221 and the transition region 242 of the current collector 24 in the thickness direction X of the wall.

[0217] In this embodiment, by setting the distance between the main body 221 and the transition region 242 in the thickness direction X of the wall to be greater than or equal to the height of the reinforcing part 2421 protruding from the side of the transition region 242 facing the electrode assembly 22, the interference between the reinforcing part 2421 and the main body 221 of the electrode assembly 22 can be reduced, which helps to reduce the assembly difficulty of the battery cell 20 and can effectively alleviate the phenomenon of the reinforcing part 2421 damaging or scratching the main body 221 of the electrode assembly 22.

[0218] In some embodiments, see Figure 6As shown, along the thickness direction X of the wall portion, the reinforcing portion 2421 protrudes from the surface of the transition region 242 facing the electrode assembly 22 with a dimension of D1, which satisfies 1mm≤D1≤5mm.

[0219] For example, the size D1 of the reinforcing part 2421 protruding from the surface of the transition region 242 facing the electrode assembly 22 can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.5mm or 5mm, etc.

[0220] In this embodiment, the height of the reinforcing part 2421 protruding from the transition area 242 in the thickness direction X of the wall is 1mm to 5mm. On the one hand, by setting the height of the reinforcing part 2421 protruding from the transition area 242 in the thickness direction X of the wall to be greater than or equal to 1mm, the reinforcing part 2421 can enhance the reinforcing effect of the transition area 242, thereby improving the structural strength and deformation resistance of the transition area 242. This further reduces the phenomenon of the second connection area 243 overlapping and short-circuiting with the wall 211 after deformation relative to the first connection area 241 during use. On the other hand, by setting the height of the reinforcing part 2421 protruding from the transition area 242 in the thickness direction X of the wall to be less than or equal to 5mm, the phenomenon of the reinforcing part 2421 occupying too much space in the thickness direction X of the wall can be alleviated, thereby saving the space occupied by the current collector 24 in the outer casing 21, which is beneficial to improving the energy density of the battery cell 20.

[0221] In some embodiments, see Figure 6 As shown, along the thickness direction X of the wall, the distance between the main body 221 and the transition zone 242 is D2, which satisfies 3mm≤D2≤10mm.

[0222] For example, the distance D2 between the main body 221 and the transition area 242 in the thickness direction X of the wall can be 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10mm, etc.

[0223] In this embodiment, the distance between the main body 221 and the transition area 242 in the thickness direction X of the wall is 3mm to 10mm. On the one hand, by setting the distance between the main body 221 and the transition area 242 in the thickness direction X of the wall to be greater than or equal to 3mm, sufficient space can be provided between the main body 221 and the transition area 242 to accommodate the reinforcing part 2421. This alleviates the phenomenon that the insufficient distance between the main body 221 and the transition area 242 restricts the height of the reinforcing part 2421, and also alleviates the interference and scraping phenomenon between the reinforcing part 2421 and the main body 221. On the other hand, by setting the distance between the main body 221 and the transition area 242 in the thickness direction X of the wall to be less than or equal to 10mm, the phenomenon that the gap between the main body 221 and the transition area 242 of the current collector 24 is too large and causes space waste can be alleviated, thereby improving the internal space utilization rate of the battery cell 20.

[0224] According to some embodiments of this application, see Figure 9 As shown, the thickness of the current collector 24 is D3, which satisfies 0.4mm≤D3≤2mm.

[0225] It should be noted that the thickness D3 of the current collector 24 is the wall thickness at any position of the plate of the current collector 24.

[0226] For example, the thickness D3 of the current collector 24 can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm.

[0227] In this embodiment, by setting the thickness of the current collecting component 24 to 0.4mm to 2mm, on the one hand, setting the thickness of the current collecting component 24 to be greater than or equal to 0.4mm gives the current collecting component 24 better structural strength and resistance to deformation, which helps to alleviate the phenomenon of short circuit between the second connection area 243 and the wall 211 after deformation relative to the first connection area 241 during use. On the other hand, setting the thickness of the current collecting component 24 to be less than or equal to 2mm can save the space occupied by the current collecting component 24 in the outer shell 21, and can reduce the phenomenon of excessive waste or excessive difficulty in processing and forming of the current collecting component 24.

[0228] According to some embodiments of this application, see Figure 4 , Figure 7 , Figure 8 and Figure 9As shown, the battery cell 20 includes multiple electrode assemblies 22, which are stacked along a first direction Y, perpendicular to the thickness direction X of the wall. The current collector 24 includes two second connection regions 243, which are located on opposite sides of the first connection region 241 along the first direction Y. Each second connection region 243 is connected to the first connection region 241 through a transition region 242, and each second connection region 243 is connected to the tab 222 of at least one electrode assembly 22.

[0229] Among them, the tabs 222 of the multiple electrode assemblies 22 are all disposed at the end of the corresponding main body 221 facing the wall 211 in the thickness direction X of the wall.

[0230] Two second connection regions 243 are located on both sides of the first connection region 241 in the first direction Y, and each second connection region 243 is connected to the first connection region 241 through a transition region 242. That is, one second connection region 243, one transition region 242, one first connection region 241, another second connection region 243 and another transition region 242 are arranged and connected in sequence along the first direction Y.

[0231] Each second connection region 243 is connected to the tab 222 of at least one electrode assembly 22, that is, each second connection region 243 is correspondingly connected to at least one tab 222 of the electrode assembly 22.

[0232] For example, in Figure 4 and Figure 7 In the battery cell 20, there are four electrode assemblies 22, which are stacked along the second direction Z. Correspondingly, the current collector 24 includes two second connection areas 243, which are spaced apart along the second direction Z. Each second connection area 243 is connected to a tab 222 of the same polarity in the two electrode assemblies 22, so that the four electrode assemblies 22 are electrically connected to the electrode terminal 23 through a current collector 24.

[0233] In this embodiment, the current collector 24 is provided with two second connection areas 243. The two second connection areas 243 are located on both sides of the first connection area 241 in the first direction Y. Each second connection area 243 is connected to the first connection area 241 through a transition area 242, and each second connection area 243 is connected to the tab 222 of at least one electrode assembly 22. This reduces the risk of short circuit when the two second connection areas 243 deform relative to the first connection area 241 and overlap with the wall 211. At the same time, it enables multiple electrode assemblies 22 stacked along the second direction Z to be connected to an electrode terminal 23 after being combined through a current collector 24. This enables the battery cell 20 with a large capacity to be realized while reducing the risk of short circuit during use.

[0234] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 10 As shown, along the thickness direction X of the wall portion, the insulating member 25 is provided with a receiving groove 251 on the side opposite to the wall portion 211, and the current collecting member 24 is disposed in the receiving groove 251.

[0235] In this case, along the thickness direction X of the wall portion, the current collecting member 24 is entirely housed within the receiving groove 251, meaning that the current collecting member 24 does not extend beyond the side of the insulating member 25 away from the wall portion 211 in the thickness direction X of the wall portion.

[0236] For example, in this embodiment, the battery cell 20 includes two current collectors 24, which are spaced apart along the second direction Z within the housing 21. Correspondingly, the insulating member 25 has two receiving grooves 251 on the side facing away from the wall 211, which are also spaced apart along the second direction Z. Each receiving groove 251 is used to accommodate one current collector 24, thereby achieving insulation isolation between the two current collectors 24 through the insulating member 25. Of course, in other embodiments, the side of the insulating member 25 facing away from the wall 211 may also have only one receiving groove 251, in which case the two current collectors 24 are spaced apart along the second direction Z within the same receiving groove 251.

[0237] For example, the receiving groove 251 extends through the surfaces of both sides of the insulating member 25 in the first direction Y, so as to facilitate the assembly of the current collecting member 24 into the receiving groove 251.

[0238] In this embodiment, by providing a receiving groove 251 for accommodating the current collector 24 on the side of the insulating member 25 away from the wall portion 211, the current collector 24 can be accommodated in the receiving groove 251 of the insulating member 25. With this structure, the battery cell 20 can achieve the following: on the one hand, the current collector 24 and the insulating member 25 share a portion of the space in the thickness direction X of the wall portion, which is beneficial to improving the internal space utilization of the battery cell 20. On the other hand, it can achieve the effect of the insulating member 25 covering the current collector 24, thereby improving the insulation and isolation effect of the insulating member 25 on the current collector 24 and the wall portion 211, while also achieving the function of the insulating member 25 insulating and isolating the current collector 24 and other components, which is beneficial to further reduce the risk of internal short circuits in the battery cell 20 during use.

[0239] In some embodiments, see Figure 4 and Figure 5As shown, the electrode assembly 22 also includes a main body 221, with a tab 222 connected to one end of the main body 221 facing the wall 211 in the thickness direction X of the wall. An insulating member 25 is located between the wall 211 and the main body 221. Along the thickness direction X of the wall, the insulating member 25 abuts against the end of the main body 221 where the tab 222 is located.

[0240] Along the thickness direction X of the wall portion, the insulating member 25 abuts against the end of the main body portion 221 where the tab 222 is provided. That is, the surface of the insulating member 25 facing away from the wall portion 211 and having a receiving groove 251 abuts against the end of the main body portion 221 where the tab 222 is provided, so that at least a portion of the tab 222 can also be accommodated in the corresponding receiving groove 251.

[0241] In this embodiment, the tab 222 is connected to the end of the main body 221 of the electrode assembly 22 facing the wall 211 in the thickness direction X of the wall portion, so that both the tab 222 and the current collector 24 are located at the end of the main body 221 facing the wall 211, thereby reducing the connection difficulty between the tab 222 and the current collector 24. In addition, by abutting the insulating member 25 against the end of the main body 221 where the tab 222 is provided in the thickness direction X of the wall portion, the insulating member 25 and the electrode assembly 22 can play a role in supporting and restricting each other within the housing 21, thereby reducing the risk of shaking or displacement of the insulating member 25 and the electrode assembly 22 during use.

[0242] According to some embodiments of this application, see Figure 7 , Figure 9 and Figure 10 As shown, along the thickness direction X of the wall portion, a connecting portion 2411 protrudes from the side of the first connecting area 241 facing the wall portion 211, and the connecting portion 2411 connects to the electrode terminal 23. The insulating member 25 is provided with a through hole 252, which penetrates the insulating member 25 along the thickness direction X of the wall portion, and the connecting portion 2411 and / or the electrode terminal 23 are inserted into the through hole 252.

[0243] The connecting portion 2411 is a protruding structure on the surface of the first connecting area 241 facing the wall portion 211, and the connecting portion 2411 is connected to the electrode terminal 23, so that the first connecting area 241 is a structure in which the connecting portion 2411 and the electrode terminal 23 are connected to each other.

[0244] The through hole 252 on the insulating member 25 is a structure provided for the electrode terminal 23 and the connecting part 2411. The projection of the connecting part 2411 in the thickness direction X of the wall is located in the through hole 252 so that the connecting part 2411 can be inserted into the through hole 252.

[0245] The connecting part 2411 and / or the electrode terminal 23 are inserted into the through hole 252. That is, it can be a structure in which only the connecting part 2411 is inserted into the through hole 252 along the thickness direction X of the wall, or it can be a structure in which only the electrode terminal 23 is inserted into the through hole 252 along the thickness direction X of the wall, or it can be a structure in which both the connecting part 2411 and the electrode terminal 23 are inserted into the through hole 252 along the thickness direction X of the wall.

[0246] For example, in this embodiment, the connecting portion 2411 protruding from the first connecting area 241 is inserted into the through hole 252 along the thickness direction X of the wall portion, and the connecting portion 2411 extends out of the insulating member 25 facing the wall portion 211, so as to facilitate the connection of the connecting portion 2411 and the electrode terminal 23 to be assembled and connected to each other. Of course, in other embodiments, the first connecting area 241 of the current collector 24 may not have a connecting portion 2411. Correspondingly, the surface of the first connecting area 241 facing the wall portion 211 in the thickness direction X of the wall portion is directly connected to the electrode terminal 23.

[0247] It should be noted that in the embodiment where a receiving groove 251 is provided on the side of the insulating member 25 away from the wall portion 211 and the current collecting member 24 is accommodated in the receiving groove 251, the through hole 252 is a structure provided on the bottom surface of the receiving groove 251 and penetrating the bottom wall of the receiving groove 251 along the thickness direction X of the wall portion.

[0248] In this embodiment, a connecting portion 2411 protrudes from the side of the first connecting area 241 facing the wall portion 211, and a through hole 252 is provided on the insulating member 25 for the connecting portion 2411 and / or the electrode terminal 23 to be inserted, so that the first connecting area 241 can be connected to the electrode terminal 23 through the connecting portion 2411. The battery cell 20 with this structure can improve the contact effect between the current collector 24 and the electrode terminal 23, thereby improving the connection quality between the current collector 24 and the electrode terminal 23.

[0249] In some embodiments, see Figure 9 As shown, along the thickness direction X of the wall portion, the first connecting area 241 is away from the surface of the wall portion 211 and a second groove 2412 is formed at the position corresponding to the connecting portion 2411.

[0250] For example, the connecting portion 2411 protruding from the surface of the first connecting area 241 facing the wall portion 211 is a structure formed by a stamping process, so that the connecting portion 2411 is formed on the surface of the first connecting area 241 facing the wall portion 211, and a groove is formed on the surface of the first connecting area 241 away from the wall portion 211. Of course, the processing method of the connecting portion 2411 protruding from the surface of the first connecting area 241 facing the wall portion 211 is not limited to this. In other embodiments, the connecting portion 2411 protruding from the surface of the first connecting area 241 facing the wall portion 211 can also be formed by a processing process such as casting or milling.

[0251] For example, in this embodiment of the application, the connecting part 2411 is welded to the electrode terminal 23. Correspondingly, multiple printing grooves can also be provided on the bottom surface of the groove to improve the welding quality of the connecting part 2411 and the electrode terminal 23.

[0252] In this embodiment, by forming a second groove 2412 on the surface of the first connection area 241 away from the wall portion 211 and corresponding to the position of the connection portion 2411, the connection portion 2411 on the first connection area 241 is a structure that can be formed by stamping process. The connection portion 2411 and the second groove 2412 are formed on the surfaces on both sides of the first connection area 241, thereby effectively reducing the forming difficulty of the current collector 24 and improving the production efficiency of the battery cell 20.

[0253] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 5 As shown, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity with an opening 2121, in which the electrode assembly 22 is housed. The end cap 213 closes the opening 2121 and is a wall portion 211.

[0254] The end cap 213 is a wall portion 211, that is, the electrode terminal 23 is disposed on the end cap 213 of the housing 21. Correspondingly, the insulating member 25 is disposed on the side of the end cap 213 facing the electrode assembly 22.

[0255] In this embodiment, by setting the wall portion 211 of the outer casing 21 as an end cap 213 for closing the opening 2121 of the housing 212, the battery cell 20 with this structure is easy to assemble the electrode terminal 23 onto the end cap 213, which helps to reduce the assembly difficulty of the electrode terminal 23 and reduces the connection difficulty between the current collector 24 and the electrode terminal 23 and between the current collector 24 and the tab 222, thereby effectively reducing the assembly difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0256] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the outer casing 21 can include a housing 212 and an end cap 213. The housing 212 includes an integrally formed side wall and a bottom wall. The side wall surrounds the bottom wall. Along the thickness direction X of the wall portion, one end of the side wall is connected to the bottom wall, and the other end forms an opening 2121. The side wall and the bottom wall together define a receiving cavity. The electrode assembly 22 is received in the receiving cavity. The end cap 213 closes the opening 2121. The bottom wall is a wall portion 211.

[0257] The shell 212 includes integrally formed side walls and bottom walls, meaning that the shell 212 is manufactured using an integral forming process, such as stamping, casting, or extrusion molding. In other words, the side walls and bottom walls of the shell 212 are an integral structure.

[0258] The bottom wall is a wall portion 211, that is, the electrode terminal 23 is disposed on the bottom wall of the housing 212, and correspondingly, the insulating member 25 is disposed on the side of the bottom wall of the housing 212 facing the electrode assembly 22.

[0259] In this embodiment, by setting the wall portion 211 of the outer casing 21 as a wall of the casing 212 that is opposite to the end cap 213 in the thickness direction X of the wall portion, the battery cell 20 with this structure can make the wall portion 211 equipped with the electrode terminals 23 far away from the end cap 213, so that there is no direct connection between the wall portion 211 and the end cap 213. This can alleviate the phenomenon that the force generated when the electrode terminals 23 pull or twist the wall portion 211 acts on the end cap 213, thereby reducing the risk of connection failure between the end cap 213 and the casing 212, and thus helping to reduce the leakage risk of the battery cell 20 during use.

[0260] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 of any of the above schemes.

[0261] Among them, see Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0262] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0263] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0264] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0265] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, in... Figure 2 In the battery device 100, multiple battery cells 20 are arranged inside the housing 10. The multiple battery cells 20 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 20 is housed in the housing 10. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 20 in series, parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in the housing 10.

[0266] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0267] It should be noted that in some embodiments, the battery device 100 may not have a housing 10. The battery device 100 includes multiple battery cells 20, and the battery device 100 composed of multiple battery cells 20 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0268] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 of any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0269] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 20.

[0270] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0271] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer shell has walls; An electrode assembly, housed within the housing, the electrode assembly having tabs; Electrode terminals are disposed on the wall portion; A current collector is disposed between the wall portion and the electrode assembly, and the current collector is electrically connected to the electrode assembly and the electrode terminal; as well as An insulating element is disposed on the side of the wall portion facing the electrode assembly to insulate and isolate the wall portion and the current collector; The current collector includes a first connection area, a transition area, and a second connection area. The transition area connects the first connection area and the second connection area. The first connection area connects to the electrode terminal, and the second connection area connects to the electrode tab. A reinforcing portion protrudes from at least one side of the transition area along the thickness direction of the wall.

2. The battery cell according to claim 1, characterized in that, Along the thickness direction of the wall portion, the reinforcing portion is provided on one side of the transition zone, and a first groove is formed on the other side corresponding to the position of the reinforcing portion.

3. The battery cell according to claim 2, characterized in that, The first connecting region, the transition region, and the second connecting region are arranged along a first direction, the first groove extends along a second direction and penetrates at least one end of the transition region, and the first direction, the second direction, and the thickness direction of the wall are perpendicular to each other.

4. The battery cell according to claim 3, characterized in that, Along the second direction, the first groove extends through both ends of the transition region.

5. The battery cell according to any one of claims 1-4, characterized in that, The first connecting region, the transition region, and the second connecting region are arranged along a first direction. Along a second direction, the second connecting region has an overhang that extends beyond one end of the transition region. The overhang is connected to the electrode tab. The first direction, the second direction, and the thickness direction of the wall are perpendicular to each other.

6. The battery cell according to claim 1, characterized in that, The first connecting region, the transition region, and the second connecting region are arranged along a first direction. The size of the reinforcing part in the second direction is larger than the size of the reinforcing part in the first direction. The first direction, the second direction, and the thickness direction of the wall are perpendicular to each other.

7. The battery cell according to claim 6, characterized in that, Along the second direction, the two ends of the reinforcing portion extend to the two ends of the transition region, respectively.

8. The battery cell according to claim 6, characterized in that, Along the first direction, the width of the reinforcing part is W, which satisfies 1mm≤W≤10mm.

9. The battery cell according to claim 8, characterized in that, 1.5mm≤W≤8mm.

10. The battery cell according to claim 6, characterized in that, Along the thickness direction of the wall portion, a connecting portion is provided on the side of the first connecting area facing the wall portion, and the connecting portion is connected to the electrode terminal; Wherein, along the first direction, the minimum distance between the reinforcing part and the connecting part is L1, which satisfies 1mm≤L1≤10mm.

11. The battery cell according to claim 10, characterized in that, 2mm≤L1≤8mm.

12. The battery cell according to claim 6, characterized in that, The second connection region has a first end that is away from the first connection region in the first direction; Wherein, along the first direction, the minimum distance between the reinforcing part and the first end is L2, which satisfies 1mm≤L2≤10mm.

13. The battery cell according to claim 12, characterized in that, 2mm≤L2≤8mm.

14. The battery cell according to claim 1, characterized in that, Along the thickness direction of the wall portion, the reinforcing portion protrudes from the side of the transition region facing the electrode assembly.

15. The battery cell according to claim 14, characterized in that, The electrode assembly further includes a main body, and the electrode tab is connected to one end of the main body facing the wall in the thickness direction of the wall; Wherein, along the thickness direction of the wall portion, the dimension of the reinforcing portion protruding from the surface of the transition region facing the electrode assembly is D1, and the distance between the main body portion and the transition region is D2, satisfying that D2≥D1.

16. The battery cell according to claim 15, characterized in that, 1mm≤D1≤5mm.

17. The battery cell according to claim 15, characterized in that, 3mm≤D2≤10mm.

18. The battery cell according to claim 1, characterized in that, The thickness of the current collecting component is D3, which satisfies 0.4mm≤D3≤2mm.

19. The battery cell according to claim 1, characterized in that, The battery cell includes a plurality of electrode assemblies, which are stacked along a first direction, the first direction being perpendicular to the thickness direction of the wall portion; The current collecting component includes two second connection regions, which are located on both sides of the first connection region in the first direction. Each second connection region is connected to the first connection region through a transition region, and each second connection region is connected to the tab of at least one electrode assembly.

20. The battery cell according to claim 1, characterized in that, Along the thickness direction of the wall portion, the insulating member has a receiving groove on the side opposite to the wall portion, and the current collecting member is disposed in the receiving groove.

21. The battery cell according to claim 20, characterized in that, The electrode assembly further includes a main body, the tab is connected to one end of the main body facing the wall in the thickness direction of the wall, and the insulating member is located between the wall and the main body; Wherein, along the thickness direction of the wall portion, the insulating member abuts against the end of the main body portion where the electrode tab is provided.

22. The battery cell according to claim 1, characterized in that, Along the thickness direction of the wall portion, a connecting portion is provided on the side of the first connecting area facing the wall portion, and the connecting portion is connected to the electrode terminal; The insulating component is provided with a through hole, which penetrates the insulating component along the thickness direction of the wall portion, and the connecting portion and / or the electrode terminal are inserted into the through hole.

23. The battery cell according to claim 22, characterized in that, Along the thickness direction of the wall portion, the first connecting area is away from the surface of the wall portion and a second groove is formed at the position corresponding to the connecting portion.

24. The battery cell according to claim 1, characterized in that, The outer casing includes: The housing has an internally formed receiving cavity with an opening, and the electrode assembly is received within the receiving cavity; End cap, to close the opening; The end cap is the wall portion.

25. The battery cell according to claim 1, characterized in that, The outer casing includes: The housing includes an integrally formed sidewall and a bottom wall. The sidewall surrounds the bottom wall. Along the thickness direction of the wall portion, one end of the sidewall is connected to the bottom wall, and the other end forms an opening. The sidewall and the bottom wall together define a receiving cavity, in which the electrode assembly is received. End cap, to close the opening; The bottom wall is the wall portion.

26. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-25.

27. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-25, the battery cell being used to provide electrical energy.

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