Battery cell, battery and electric device

Abstract

A battery cell, a battery and an electric device. The battery cell comprises: a casing component, which comprises a casing body, wherein an open end and a first casing wall are respectively formed at two opposite ends of the casing body, the first casing wall being provided with a mounting hole; a second casing wall is formed on at least one side of the casing body adjacent to the first casing wall; a guide portion is provided between the second casing wall and the first casing wall, the guide part comprising a guide face located in the casing body, and in the direction from the open end to the first casing wall, the distance between the guide face and an inner wall surface of the second casing wall gradually increasing; a terminal post component, which is mounted on the first casing wall and covers the mounting hole, wherein the terminal post component comprises a terminal post body arranged opposite the mounting hole; and a battery cell component, which is accommodated in an accommodating cavity of the casing body and is connected to the terminal post body.

Description

Battery cells, batteries and electrical devices Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery plays an irreplaceable and crucial role as the power source. A battery consists of a casing and multiple battery cells housed within it. Each battery cell includes a cell component and a housing for containing it. Currently, when installing the cell component into the housing, it is difficult to align the cell component and the housing; that is, the cell component is not easily centered after being installed, resulting in high assembly difficulty and poor consistency in the performance of the battery cells.

[0003] Summary of the Invention

[0004] This application provides a battery cell, a battery, and an electrical device. When assembling the battery cell, the cell components can be quickly placed in the center of the casing, making assembly easy.

[0005] In a first aspect, embodiments of this application provide a battery cell, comprising: a housing component including a housing body, with open ends and a first housing wall formed at opposite ends of the housing body, the first housing wall having a mounting hole, at least one side of the housing body adjacent to the first housing wall being a second housing wall, a guide portion being provided between the second housing wall and the first housing wall, the guide portion including a guide surface located within the housing body, the distance between the guide surface and the inner wall surface of the second housing wall gradually increasing in the direction from the open end to the first housing wall; a terminal component, mounted on the first housing wall and covering the mounting hole, the terminal component including a terminal body disposed opposite to the mounting hole; and a cell component, housed in a receiving cavity of the housing body and connected to the terminal body.

[0006] In the above technical solution, by setting a guide part between the first shell wall and the second shell wall, the guide part includes a guide surface located inside the shell. After the battery cell component is installed into the shell, the battery cell component can cooperate with the guide surface so that the battery cell component can be centered in the shell. Due to the limiting effect of the guide surface, during assembly, the battery cell component can be directly placed into the shell until the battery cell component and the guide surface contact and cooperate, so that the battery cell component is centered in the shell. The assembly difficulty is small, which helps to improve the assembly speed and ensure the consistency of the relative position of the battery cell component and the shell. After the battery cell component is installed into the shell, the position is centered. Therefore, the symmetry of the tabs connected to the electrode post body is better. There will be no situation where the end of some tabs connected to the active material coating part is too far away from the electrode post body. When the battery cell component expands, the tabs are not easily stretched excessively.

[0007] In some embodiments, at least two sides of the shell body adjacent to the first shell wall form a second shell wall.

[0008] In the above technical solution, the battery cell component can be limited on at least two sides, making the limiting more stable and the position of the battery cell component less prone to displacement, and it can be stably set in the center of the casing.

[0009] In some embodiments, the shell body has a first direction and a second direction parallel to the outer wall surface of the first shell wall, the size of the first shell wall in the first direction is larger than the size of the first shell wall in the second direction, and the shell body forms a second shell wall at both ends of the first direction and both ends of the second direction.

[0010] In the above technical solution, the guide parts around the shell component can limit the battery cell component, making the limiting more stable, the battery cell component less prone to deflection, and the limiting effect is good.

[0011] In some embodiments, in a direction perpendicular to the second shell wall, the size of the first shell wall is smaller than the distance between the second shell wall and the opposite shell wall, and the first shell wall is connected to the second shell wall via a guide portion.

[0012] In the above technical solution, the size of the first shell wall is smaller, resulting in better structural strength. The pole post component is installed on the first shell wall, and the deflection is small during pull-out and pole post push-twist, making it less prone to deformation. The strength of the pole post component when riveted to the first shell wall is also higher.

[0013] In some embodiments, the wall thickness of the guide portion and the wall thickness of the second shell wall are less than the wall thickness of the first shell wall.

[0014] In the above technical solution, the first shell wall is thicker to ensure sufficient structural strength, small deflection during bursting and pole push-twist, and is not prone to deformation, and has sufficient connection strength with the pole component.

[0015] In some embodiments, the guide surface is configured as a ramp.

[0016] In the above technical solution, the structure of the guide surface is relatively simple, easy to process, has low processing difficulty, low manufacturing cost, and during installation, the battery cell components can be easily and quickly matched with the guide surface, making installation easy.

[0017] In some embodiments, the guide portion has an outer side surface located outside the housing, and the outer side surface is parallel to the guide surface.

[0018] In the above technical solution, on the one hand, it is easy to process, and can be formed by extrusion or stretching, with strong manufacturability. On the other hand, it can also make the weight of the guide part as light as possible, thereby reducing the weight of the casing and improving the energy density of the battery.

[0019] In some embodiments, the spacing between the outer side surface and the guide surface is equal to the wall thickness of the second shell wall.

[0020] In the above technical solution, the guide part and the second shell wall are not prone to breakage, the guide part has good fatigue resistance, and the energy density of the battery cell is high.

[0021] In some embodiments, the guide surface is configured as an arc surface with a radius of R, wherein 5mm≤R≤9mm.

[0022] In the above technical solution, the radius of the guide surface is within this range, which can not only ensure that the cell component is located in the center of the casing, but also not have too much impact on the energy density of the battery.

[0023] In some embodiments, the guide portion has an outer surface located outside the housing, and the outer surface is configured as an arc surface.

[0024] In the above technical solution, the guide part can be formed by directly extruding or bending the shell during molding, which is easy and convenient to manufacture.

[0025] In some embodiments, the distance between the outer surface and the guide surface gradually increases in the direction from the open end to the first shell wall.

[0026] In the above technical solution, the wall thickness difference at the connection between the guide part and the first shell wall will not be too large, and the wall thickness difference at the connection between the guide part and the second shell wall will not be too large. On the one hand, the structural strength of the guide part is higher, and the connection between the guide part and the first shell wall and the connection between the guide part and the second shell wall is less likely to break. On the other hand, it can reduce the manufacturing difficulty of the shell body and make the shell body more manufacturable.

[0027] In some embodiments, the minimum spacing between the outer side and the guide surface is equal to the wall thickness of the second shell wall.

[0028] In the above technical solution, there is no abrupt change in the thickness between the second shell wall and the guide part, the structural strength of the guide part is higher, and the integration between the guide part, the first shell wall and the second shell wall is better.

[0029] In some embodiments, the guide portion includes at least two sections connected sequentially in the direction from the second shell wall to the first shell wall, with the latter being closer to the mounting hole than the former, any two adjacent sections being arranged at an angle, and at least the section closer to the first shell wall among the at least two sections having a guide surface.

[0030] In the above technical solution, the setting of the guide surface can limit the position of the cell component; when two battery cells are arranged side by side, the outer sides of the two guide parts of the two battery cells will define the clearance space to accommodate the shape, thereby the height of the pole component can be made lower, which is beneficial to reduce the mass and volume of the battery cell and improve the energy density of the battery.

[0031] In some embodiments, there are two segments, namely a first segment and a second segment. The first segment is perpendicular to the second shell wall, and the second segment is perpendicular to the first segment and connected to the first shell wall, and is provided with a guide surface.

[0032] In the above technical solution, on the one hand, the guide portion including the first section and the second section can limit the position of the battery cell component. After the battery cell component is installed in the housing, the battery cell component can cooperate with the guide surface so that the battery cell component can be centered in the housing. On the other hand, the guide portion including only the first section and the second section has a simple structure, is easy to process and form, and is not easy to deform.

[0033] In some embodiments, a first transition angle is provided between the first segment and the second shell wall, and a second transition angle is provided between the second segment and the first segment.

[0034] In the above technical solution, the transition between the first section and the second shell wall, between the first section and the second section, and between the second section and the first shell wall can be smooth, which is convenient for processing, has strong manufacturability, and is easy to form as a whole. At the same time, it can also reduce the stress at the connection between the first section and the second shell wall, the connection between the second section and the first section, and the connection between the second section and the first shell wall.

[0035] In some embodiments, the surface of the electrode body facing the cell component is the inner end face of the electrode body, and the cell component is connected to the inner end face of the electrode body through a conductive part.

[0036] The above technical solution can reduce the difficulty of assembling and connecting the conductive part and the electrode body, improve processing efficiency, and help shorten the length of the conductive part, saving materials and costs.

[0037] In some embodiments, the battery cell component includes an active material coating portion housed in a receiving cavity and an electrode portion connected to the active material coating portion. The electrode portion includes a gathering portion formed by stacking and connecting multiple layers of electrode tabs. At least a portion of the gathering portion is laid on the inner end face of the electrode body and connected to the inner end face of the electrode body.

[0038] In the above technical solution, by laying the folding part on the inner end face of the pole body, the folding part is laid flat and flat. At least part of the folding part falls on the inner end face of the pole body, so that the pole ear will not be damaged due to bending of the folding part, thus improving the conductivity. Moreover, it is convenient to weld the clamping nozzle to press the folding part, thereby improving the connection reliability between the folding part and the pole body.

[0039] In some embodiments, the battery cell component includes an active material coating portion housed in a receiving cavity, and an electrode portion connected to the active material coating portion, the electrode portion being connected to the electrode body via a conductive element.

[0040] In the above technical solution, the conductive component can be connected to the inner end face of the electrode body, thereby shortening the length of the conductive component.

[0041] In some embodiments, the conductive element includes a first connecting segment, the first connecting segment includes two clamping portions, and the electrode portion includes an electrode end, which is clamped between the two clamping portions and connected to the clamping portions.

[0042] In the above technical solution, two clamping parts can be used to limit the end of the electrode tab, thereby improving the connection reliability of the multi-layer electrode tabs in the end of the electrode tab.

[0043] In some embodiments, the surface of the electrode body facing the cell component is the inner end face of the electrode body. The conductive element includes a second connecting segment, which is laid on the inner end face of the electrode body and connected to the inner end face of the electrode body. The conductive element is bent at the connection position between the first connecting segment and the second connecting segment so that the first connecting segment is located on the side of the second connecting segment away from the electrode body. One of the clamping portions is supported on the side of the tab end away from the electrode body.

[0044] In the above technical solution, the support of the tabs by the clamping part can improve the redundancy of the tabs and reduce the risk of short circuits caused by the tabs being inserted into the active material coating part. Moreover, the bent conductive parts can act as a buffer support, reducing the risk of the cell components colliding with the casing components and improving the reliability of the battery cells.

[0045] In some embodiments, the tab portion includes a folded portion formed by stacking and connecting multiple tab sheets, and the conductive element includes a first connecting segment, the folded portion being stacked on one side of the first connecting segment in the thickness direction and connected to the first connecting segment.

[0046] In the above technical solution, the first connecting section is in the form of a plate. The thickness direction of the first connecting section is consistent with that of the gathering part. The two are stacked along the thickness direction of the first connecting section, so the way the gathering part and the conductive part are matched is simple, which is conducive to improving production efficiency.

[0047] In some embodiments, the surface of the electrode body facing the cell component is the inner end face of the electrode body, and the first connecting section is supported on the side of the folding portion away from the electrode body, so that the folding portion is sandwiched between the inner end face of the electrode body and the first connecting section.

[0048] In the above technical solution, the support of the gathering part by the first connecting section can improve the redundancy of the electrode tab and reduce the risk of short circuit caused by the electrode tab being inserted into the active material coating part.

[0049] In some embodiments, the battery cell further includes a pressure relief device located on the housing component and on the same side or opposite side as the terminal component.

[0050] In the above technical solution, the pressure relief device and the terminal post are located on the same side. This simplifies the design of the other shell walls besides the second shell wall, and simplifies the structure and processing of the battery cell. Alternatively, if the pressure relief device and the terminal post are located on opposite sides, there is no need to consider reducing the volume of the terminal post by occupying space in the second shell wall, thus allowing for flexible design of the shape and volume of the terminal post as needed.

[0051] In some embodiments, the electrode component includes an electrode body, a transition structure, and an insulating sealing structure. The transition structure surrounds the electrode body and is connected to a first housing wall. The insulating sealing structure is insulating and sealingly fitted between the transition structure and the electrode body.

[0052] In the above technical solution, since the pole component includes not only the pole body but also a transition structure connected to the housing component, and an insulating sealing structure that provides insulation and sealing between the transition structure and the pole body is provided, when installing the pole component to the housing component and connecting the transition structure to the housing component, there is no need to provide a seal between the transition structure and the housing component, and there is no need to apply a large sealing pressure to meet the compression degree of the seal. This can reduce the stress on the second housing wall or cover plate, protect the housing component, and thus help reduce the wall thickness of the housing component and reduce material costs.

[0053] In some embodiments, the transition structure is formed as an elongated strip extending along the length direction of the first shell wall, and the outline shape of the pole body matches the outline shape of the transition structure; or, the transition structure is formed as an elongated strip extending along the length direction of the first shell wall, and the pole body is located at the length center of the transition structure and is circular.

[0054] In the above technical solution, the connection position between the adapter structure and the pole body is subjected to uniform force, and the compression of the insulation and sealing structure can be easily controlled to improve the reliability of the sealing fit between the two.

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

[0056] In the above technical solution, the assembly difficulty of the battery cell is low. After the cell component is installed into the housing component, it can be aligned with the housing body, which reduces the possibility of the tabs and the terminal body being pulled and broken, and can improve the reliability of the battery.

[0057] In some embodiments, the battery includes a housing assembly, multiple battery cells are housed in the housing assembly, the bottom of the housing assembly is a housing bottom plate, and the housing component includes a cover plate covering an opening in the housing body, the opening of the housing body facing the housing bottom plate, and the cover plate covering the bottom of the housing body; or, the opening of the housing body is away from the housing bottom plate, and the cover plate covering the top of the housing body.

[0058] In the above technical solution, once a battery cell experiences thermal runaway, the battery cell can be depressurized from the bottom, eliminating the need for a central exhaust channel design and freeing up more space for the battery cell, which is beneficial for improving battery energy density. At the same time, it can quickly achieve directional depressurization, and the ejected material can be discharged rapidly in a specified direction through the optimal channel, making it less likely to spread to surrounding cells.

[0059] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell or battery.

[0060] In the above technical solution, the electrical device uses the aforementioned battery or battery cell. When assembling the battery cell, the assembly difficulty is low. After the cell component is installed into the housing component, it can be aligned with the housing body, reducing the possibility of the tabs and terminals breaking due to pulling, improving the reliability of the battery, and helping to improve the performance of the electrical device. Attached Figure Description

[0061] 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.

[0062] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0063] Figure 2 is an exploded view of the battery structure provided in some embodiments of this application;

[0064] Figure 3 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0065] Figure 4 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0066] Figure 5 is a cross-sectional view of the casing and cover plate of a battery cell provided in some embodiments of this application;

[0067] Figure 6 is a schematic diagram of the processing of the shell body provided in some embodiments of this application;

[0068] Figure 7 is a cross-sectional view of a battery cell provided in some other embodiments of this application;

[0069] Figure 8 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0070] Figure 9 is a cross-sectional view of battery cells arranged side by side according to some embodiments of this application;

[0071] Figure 10 is a top view of a battery cell provided in some embodiments of this application;

[0072] Figure 11 is a cross-sectional view along line AA in Figure 10;

[0073] Figure 12 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0074] Figure 13 is a magnified view of a portion of Figure 12;

[0075] Figure 14 is a magnified view of part A in Figure 13;

[0076] Figure 15 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0077] Figure 16 is a schematic diagram of the structure of the cell component and the terminal component in a battery cell provided in some embodiments of this application.

[0078] Icons: Battery cell 20; Casing component 21; Cover plate 22; Cell component 23; Active material coating portion 231; Tab portion 232; Tab end 2321; Tab piece 233; Closing portion 234; Electrode assembly 235; Axial section of cell component 236; Stacked portion 237; Insulator 238; Casing body 24; Open end 241; Second casing wall 242; First casing wall 243; Guide portion 244; Guide surface 2441; Outer surface 2442; First section 2443; Second section 2444; First transition angle 2445; Second transition angle 2446; Mounting hole 249; Receiving cavity 204; Terminal component 25; Terminal body 251; Inner end face of terminal body 2511; Adapter structure 252; Insulating sealing structure 253; Conductive part 26; Conductive component 261; First connecting section 2611; Clamping part 2612; Second connecting section 2613; Pressure relief device 27; Rolled aluminum plate 30; Bar plate 40; U-shaped part 41; Aluminum shell 50; Clearance space 60; Battery 100; Box assembly 10; First part 101; Second part 102; Controller 200; Motor 300; Vehicle 1000; First direction F1; Second direction F2. Detailed Implementation

[0079] 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.

[0080] 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.

[0081] 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.

[0082] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0083] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0084] 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.

[0085] In this application, "multiple" means two or more (including two).

[0086] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, or solid-state batteries, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0087] A single battery cell includes a casing, cell components, and electrolyte. The casing houses the cell components and electrolyte (in solid-state batteries, this can be a solid electrolyte layer located between the positive and negative electrodes). The cell components include at least one electrode assembly, which consists of a positive electrode, a negative electrode, and a separator (this structure is omitted in solid-state batteries). The electrode assembly can be a wound structure or a stacked structure, etc. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes.

[0088] A positive electrode typically includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated onto the positive current collector. The positive current collector without a positive active material layer protrudes from the one with a positive active material layer, and serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the material of the positive active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0089] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector, and the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the material of the negative active material layer can be carbon or silicon, etc. The material of the separator is not limited, for example, it can be polypropylene or polyethylene, etc. In addition, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of this application are not limited to these.

[0090] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0091] In related technologies, battery cells are manufactured by coating an active material layer onto a current collector and then cutting it to obtain an electrode assembly consisting of a current collector coated with the active material layer (referred to as the active material coated portion) and a current collector without the active material layer (referred to as the tab). The positive and negative electrode assemblies and a separator are then sequentially stacked or wound to obtain an electrode assembly. Multiple tabs are stacked in the electrode assembly to form a tab section. The tab section connects to an adapter plate to form a conductive section, or the tab section itself forms a conductive section; the active material coated portion and the conductive section form the cell component. The battery cell casing has terminals. During manufacturing, the conductive section is typically welded to the terminals to ensure normal charging and discharging operations.

[0092] When the battery cell is installed into the casing, it is in a dry and compressed state. After the casing is filled with electrolyte, the cell absorbs the electrolyte and expands, increasing its thickness. Therefore, the size of the casing's cavity is usually larger than the size of the corresponding position of the cell. However, because the size of the casing's cavity is larger than the size of the corresponding position of the cell, it is difficult to align the cell with the casing after installation; that is, the cell is not well centered within the casing. When the cell is not aligned with the casing, the distance between the end of some tabs connected to the active material coating and the terminal post will be greater. When the cell expands, these tabs are easily broken due to stretching, resulting in poor battery performance and inconsistent performance between individual battery cells.

[0093] Based on the above considerations, in order to reduce the assembly difficulty of the battery cell components and ensure that the battery cell components can be aligned with the housing after being installed in the housing, this application proposes a battery cell. The battery cell includes a housing component, a terminal component, and a battery cell component. The housing component includes a housing body, with an open end and a first housing wall formed at opposite ends of the housing body. The first housing wall has a mounting hole. At least one side of the housing body adjacent to the first housing wall is a second housing wall. A guide portion is provided between the second housing wall and the first housing wall. The guide portion includes a guide surface located inside the housing body. In the direction from the open end to the first housing wall, the distance between the guide surface and the inner wall surface of the second housing wall gradually increases. The terminal component is installed on the first housing wall and covers the mounting hole. The terminal component includes a terminal body disposed opposite to the mounting hole. The battery cell component is received in the receiving cavity of the housing body and connected to the terminal body.

[0094] In this type of battery cell, a guide portion is provided between the first and second shell walls. The guide portion includes a guide surface located inside the shell. After the cell component is installed into the shell, it can mate with the guide surface to center the cell component within the shell. Due to the limiting effect of the guide surface, during assembly, the cell component can be directly placed into the shell until it contacts and mates with the guide surface, thus centering the cell component within the shell. This reduces assembly difficulty, improves assembly speed, and ensures the consistency of the relative positions of the cell component and the shell. With the cell component centered after being installed into the shell, the symmetry of the tabs connected to the electrode post body is better. This prevents the end of the tab connected to the active material coating from being too far from the electrode post body. When the cell component expands, the tabs are less likely to be excessively stretched.

[0095] This application provides an electrical device that uses the battery cell disclosed herein 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.

[0096] For ease of explanation, the following embodiments use a vehicle as an example of an electrical device according to one embodiment of this application. Please refer to Figure 1, which is a structural schematic diagram of a vehicle provided in some embodiments of this application. The vehicle can be a gasoline vehicle, a natural gas 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 100 is installed inside the vehicle, and the battery 100 can be located at the bottom, front, or rear of the vehicle. The battery 100 can be used to power the vehicle; for example, the battery 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of starting, navigation, and driving the vehicle. In some embodiments of this application, the battery 100 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle.

[0097] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing assembly 10 and battery cells 20, with the battery cells 20 housed within the housing assembly 10.

[0098] The housing assembly 10 provides a receiving space for the battery cell 20, and the housing assembly 10 can adopt various structures. In some embodiments, the housing assembly 10 may include a first portion 101 and a second portion 102, which overlap each other, and together define a receiving space for accommodating the battery cell 20. The second portion 102 may be a hollow structure open at one end, and the first portion 101 may be a plate-like structure, with the first portion 101 covering the open side of the second portion 102 so that the first portion 101 and the second portion 102 together define the receiving space; the first portion 101 and the second portion 102 may also be hollow structures both open on one side, with the open side of the first portion 101 covering the open side of the second portion 102. Of course, the housing assembly 10 formed by the first portion 101 and the second portion 102 can be of various shapes, such as a cylinder, a cuboid, etc.

[0099] The housing assembly 10 can prevent liquids or other foreign objects from affecting the charging or discharging of the individual battery cells 20. Of course, some batteries 100 may not include the aforementioned housing assembly 10 and may be directly installed in the battery mounting compartment of the electrical device.

[0100] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of multiple battery cells 20 is housed within the housing assembly 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing assembly 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 20.

[0101] Hereinafter, with reference to the accompanying drawings, a battery cell 20 according to an embodiment of the present application will be described.

[0102] Please refer to Figures 3 to 8. Figure 3 is a cross-sectional view of a battery cell provided in some embodiments of this application; Figure 4 is a partial cross-sectional view of a battery cell provided in some embodiments of this application; Figure 5 is a cross-sectional view of the casing 24 and cover plate 22 in a battery cell provided in some embodiments of this application; Figure 6 is a schematic diagram of the processing of the casing provided in some embodiments of this application; Figure 7 is a cross-sectional view of a battery cell provided in other embodiments of this application; and Figure 8 is a cross-sectional view of a battery cell provided in yet another embodiment of this application.

[0103] The battery cell 20 includes a housing component 21, a terminal component 25, and a cell component 23. The housing component 21 includes a shell body 24, with an open end 241 and a first shell wall 243 formed at opposite ends. The first shell wall 243 has a mounting hole 249. At least one side of the shell body 24 adjacent to the first shell wall 243 is a second shell wall 242. A guide portion 244 is provided between the second shell wall 242 and the first shell wall 243. The guide portion 244 includes a guide surface 2441 located inside the shell body 24. In the direction from the open end 241 to the first shell wall 243, the distance between the guide surface 2441 and the inner wall surface of the second shell wall 242 gradually increases. The terminal component 25 is installed on the first shell wall 243 and covers the mounting hole 249. The terminal component 25 includes a terminal body 251 disposed opposite to the mounting hole 249. The cell component 23 is received in the receiving cavity 204 of the shell body 24 and connected to the terminal body 251.

[0104] For example, the second shell wall 242 can be integrally formed with the first shell wall 243. In this way, the overall structure of the shell body 24 is good, and fatigue cracking at the connection between the first shell wall 243 and the second shell wall 242 is less likely to occur, and the processing is convenient. Alternatively, the second shell wall 242 can be formed separately from the first shell wall 243. The second shell wall 242 and the first shell wall 243 can be welded or connected by fasteners. During assembly, the first shell wall 243 and the second shell wall 242 are first connected to form the shell body 24, and then the battery cell component 23 is installed into the shell body 24.

[0105] By way of example, referring to Figures 3, 4, 5, 7 and 8, the housing component 21 may include a housing body 24 and a cover plate 22. One end of the housing body 24 is an open end 241, and the cover plate 22 covers the open end 241. The housing body 24 and the cover plate 22 together form a receiving cavity 204. Alternatively, by way of example, the housing component 21 may include two housing bodies 24, each housing body 24 having an open end 241 at one end. The open ends 241 of the two housing bodies 24 face each other and cover each other. The two housing bodies 24 together form a receiving cavity 13.

[0106] Specifically, the guide portion 244 located on the wall outside the shell 24 can be parallel to or not parallel to the guide surface 2441. The guide surface 2441 between the second shell wall 242 and the first shell wall 243 on one side can be an inclined plane or an arc surface, or it can include multiple surfaces extending in different directions and continuously arranged. In the direction from the open end 241 to the first shell wall 243, the distance between the guide surface 2441 and the inner wall surface of the second shell wall 242 gradually increases; this includes the entire distance between the guide surface 2441 and the inner wall surface of the second shell wall 242 increasing linearly or non-linearly; or, only a portion of the distance between the guide surface 2441 and the inner wall surface of the second shell wall 242 increasing linearly or non-linearly, while the distance between the other portion of the guide surface 2441 and the inner wall surface of the second shell wall 242 remains unchanged.

[0107] The battery cell component 23 may include one electrode assembly 235 or multiple electrode assemblies 235, which are arranged side by side in the receiving cavity 204 of the housing 24. The housing 24 may be made of aluminum alloy, steel, aluminum-plastic film, plastic or other materials resistant to electrolyte corrosion, and the design can be selected according to actual needs.

[0108] In some embodiments, the guide surface 2441 is larger in size and the tab 232 of the cell component 23 is shorter in size. The guide surface 2441 can guide the cell component 23 during the process of being installed into the housing 24. As a result, the tab 232 or the tab 232 and the electrode body 251 connected to the tab 232 can be moved into the mounting hole 249 along the direction facing the mounting hole 249, which is conducive to the tab 232 and the electrode body 251 being smoothly installed into the mounting hole 249.

[0109] The cell component 23 includes an electrode assembly 235, which directly mates with the guide surface 2441 of the guide portion 244, allowing the cell component 23 to be positioned centrally within the housing 24. Alternatively, the cell component 23 includes the electrode assembly 235 and an insulating member 238. The insulating member 238 is disposed between the first housing wall 243 and the electrode assembly 235 to separate the housing 24 and the electrode assembly 235. After the cell component 23 is installed into the housing 24, the insulating member 238 mates with the guide portion 244.

[0110] According to the embodiments of this application, the battery cell 20 has a guide portion 244 provided between the first shell wall 243 and the second shell wall 242. The guide portion 244 includes a guide surface 2441 located inside the shell 24. After the cell component 23 is installed into the shell 24, the cell component 23 can cooperate with the guide surface 2441 so that the cell component 23 can be centered inside the shell 24. Due to the limiting effect of the guide surface 2441, during assembly, the cell component 23 is directly placed into the shell 24 until the cell component 23 and the guide surface 2441 come into contact. The combination allows the battery cell component 23 to be centered within the housing 24, making assembly easier, improving assembly speed, and ensuring the consistency of the relative positions of the battery cell component 23 and the housing 24. After the battery cell component 23 is installed in the housing 24, its position is centered, thus ensuring good symmetry of the tabs 233 connected to the electrode post body 251. This prevents the end of some tabs 233 connected to the active material coating part 231 from being too far from the electrode post body 251, and makes it less likely for the tabs 233 to be excessively stretched when the battery cell component 23 expands.

[0111] In some optional embodiments of this application, as shown in Figures 4, 5, 7 and 8, at least two sides of the shell body 24 adjacent to the first shell wall 243 form a second shell wall 242.

[0112] For example, the shell body 24 has a first direction F1 and a second direction F2 parallel to the outer wall surface of the first shell wall 243, and the dimension of the first shell wall 243 in the first direction F1 is larger than the dimension of the first shell wall 243 in the second direction F2; wherein, the two side walls of the shell body 24 adjacent to the first shell wall 243 in the first direction F1 form the second shell wall 242; or, the two side walls of the shell body 24 adjacent to the first shell wall 243 in the second direction F2 form the second shell wall 242; or, the two side walls of the shell body 24 adjacent to the first shell wall 243 in the first direction F1 and one side wall of the shell body 24 adjacent to the first shell wall 243 in the second direction F2 form the second shell wall 242. The second shell wall 242 is formed by: 1) the side wall of the shell body 24 adjacent to the first shell wall 243 in the first direction F1 and the two side walls of the shell body 24 adjacent to the first shell wall 243 in the second direction F2; 2) the side walls of the shell body 24 adjacent to the first shell wall 243 in the first direction F1 and the two side walls of the shell body 24 adjacent to the first shell wall 243 in the second direction F2; 3) the side wall of the shell body 24 adjacent to the first shell wall 243 in the first direction F1 and the two side walls of the shell body 24 adjacent to the first shell wall 243 in the second direction F2.

[0113] The battery cell 20 can be rectangular, with its length direction being the first direction F1 and its thickness direction being the second direction F2. However, it is not limited to this; in other embodiments of this application, the battery cell 20 can also be cylindrical, flat, or other shapes.

[0114] At least two sides of the shell 24 adjacent to the first shell wall 243 form a second shell wall 242. That is, at least two sides of the first shell wall 243 have guide portions 244. The guide portions 244 on both sides can cooperate with the battery cell component 23 to limit the battery cell component 23 on at least two sides. The limiting is more stable, and the position of the battery cell component 23 is not easy to shift. It can be stably set in the center of the shell 24.

[0115] In some optional embodiments of this application, the shell body 24 has a first direction F1 and a second direction F2 parallel to the outer wall surface of the first shell wall 243. The size of the first shell wall 243 in the first direction F1 is larger than the size of the first shell wall 243 in the second direction F2. The shell body 24 forms a second shell wall 242 at both ends of the first direction F1 and the second direction F2.

[0116] In other words, guide portions 244 are provided on both sides of the first shell wall 243 in the first direction F1 and on both sides of the first shell wall 243 in the second direction F2. Thus, after the battery cell component 23 is inserted into the shell, the guide portions 244 around the shell component 21 can limit the battery cell component 23, making the limiting more stable and the battery cell component 23 less likely to deviate. The limiting effect is good, which is conducive to the symmetrical arrangement of the battery cell component 23 in the center within the shell component 21. The battery cell component 23 is less likely to deviate in the first direction F1 and the second direction F2.

[0117] In some alternative embodiments of this application, please refer to FIG4 again. In the direction perpendicular to the second shell wall 242, the dimension D1 of the first shell wall 243 is smaller than the distance D2 between the second shell wall 242 and the opposite shell wall, and the first shell wall 243 is connected to the second shell wall 242 through the guide portion 244.

[0118] For example, if the shell body 24 is adjacent to the first shell wall 243 and forms second shell walls 242 on both sides in the first direction F1, then the distance between the second shell walls 242 on both sides in the first direction F1 is greater than the dimension of the first shell wall 243 in the first direction F1. That is, compared to the second shell wall being directly connected to the first shell wall, the dimension D1 of the first shell wall 243, which is connected to the second shell wall 242 through the guide portion 244, is smaller in the direction perpendicular to the second shell wall 242.

[0119] It should be noted that the size D1 of the first shell wall 243 is smaller, resulting in better structural strength. The terminal component 25 is installed on the first shell wall 243, resulting in less deflection during pull-out and terminal push-twist operations, making it less prone to deformation. The strength of the connection between the terminal component 25 and the first shell wall 243 is also higher, and the connection between the first shell wall 243 and the terminal component 25 is less prone to damage. Alternatively, while meeting the requirements for pull-out and terminal push-twist strength, the thickness of the first shell wall 243 can be reduced to increase energy density and reduce the weight of the battery cell 20.

[0120] In some alternative embodiments of this application, as shown in FIG5, the wall thickness h2 of the guide portion 244 and the wall thickness h3 of the second shell wall 242 are less than the wall thickness h1 of the first shell wall 243.

[0121] For example, the wall thickness h2 of the guide portion 244 can be equal to, greater than, or less than the wall thickness h3 of the second shell wall 242. For example, the wall thickness h2 of the guide portion 244 can be 0.8 times the wall thickness of the second shell wall 242, or the wall thickness h2 of the guide portion 244 can be 1.2 times the wall thickness h3 of the second shell wall 242. No specific restrictions are imposed here.

[0122] It should be noted that the first shell wall 243 needs to install the terminal post component 25. Therefore, the wall thickness h1 of the first shell wall 243 is relatively thick to ensure sufficient structural strength, small deflection during pulling and twisting of the terminal post, and less prone to deformation. It also has sufficient connection strength with the terminal post component 25 to reduce the possibility of the terminal post component 25 falling off and loosening. The second shell wall 242 and the guide portion 244 are mainly used to define the receiving cavity 204 for accommodating the cell component 23. Therefore, they can be relatively thin to reduce the weight of the battery cell 20 and increase the energy density of the battery.

[0123] In some alternative embodiments of this application, as shown in Figures 3 to 6, the guide surface 2441 is configured as an inclined surface.

[0124] In other words, the guide surface 2441 is an inclined plane. Referring to Figure 6, when processing the shell 24 with the guide surface 2441 of the guide portion 244 being inclined, the rolled aluminum plate 30 is first stretched to form an aluminum shell 50, and then the corresponding position of the aluminum shell 50 is extruded to form the shell 24 with the guide portion 244 having the guide surface 244 being inclined. By adopting a step-by-step stretching method, the possibility of tensile cracking of the shell 24 during manufacturing can be reduced, and manufacturability can be enhanced.

[0125] The guide surface 2441 is constructed as an inclined surface, which makes the structure of the guide surface 2441 relatively simple, easy to process, low processing difficulty, low manufacturing cost, and during installation, the cell component 23 can easily and quickly mate with the guide surface 2441, making the installation difficult.

[0126] In some optional embodiments of this application, as shown in Figures 3 to 6, the guide portion 244 is provided with an outer side surface 2442 located outside the housing 24, and the outer side surface 2442 is parallel to the guide surface 2441.

[0127] In other words, the thickness of the guide portion 244 is uniform throughout. In other embodiments, the outer surface 2442 of the guide portion 244 outside the shell 24 may not be parallel to the guide surface 2441. For example, the outer surface 2442 of the guide portion 244 outside the shell 24 may include a first wall surface coplanar with the outer surface 2442 of the first shell wall 243 and a second wall surface coplanar with the outer surface 2442 of the second shell wall 242. Alternatively, the guide surface 2441 may be a slope, and the outer surface 2442 of the guide portion 244 outside the shell 24 may be an arc-shaped surface.

[0128] The outer surface 2442 of the guide portion 244 is parallel to the guide surface 2441. This makes it easy to process, as it can be formed by extrusion or stretching, and has strong manufacturability. On the other hand, it also makes the weight of the guide portion 244 as light as possible, thereby reducing the weight of the casing 24, which is beneficial to improving the energy density of the battery 100.

[0129] In some optional embodiments of this application, as shown in FIG5, the spacing between the outer side surface 2442 and the guide surface 2441 is equal to the wall thickness h3 of the second shell wall 242.

[0130] Here, the distance between only part of the outer surface 2442 and the guide surface 2441 may be equal to the wall thickness h3 of the second shell wall 242; or, the outer surface 2442 may be parallel to the guide surface 2441, and the wall thickness h2 of the guide portion 244 may be equal to the wall thickness h3 of the second shell wall 242.

[0131] The guide portion 244 connects the second shell wall 242 and the first shell wall 243. If the wall thickness h2 of the guide portion 244 is too small, the fatigue resistance at the guide portion 244 will be poor, affecting the service life of the battery cell 20. If the wall thickness h2 of the guide portion 244 is too large, it will increase the weight of the shell 24, thereby reducing the energy density of the battery cell 20. Furthermore, there is a thickness difference between the guide portion 244 and the second shell wall 242, and the junction between the guide portion 244 and the second shell wall 242 is prone to breakage. Therefore, in this embodiment, the distance between the outer surface 2442 and the guide surface 2441 is equal to the wall thickness h3 of the second shell wall 242. In this way, the guide portion 244 is less prone to breakage between the guide portion 244 and the second shell wall 242, the fatigue resistance of the guide portion 244 is better, and the energy density of the battery cell 20 is higher.

[0132] In some optional embodiments of this application, as shown in FIG7, the guide surface 2441 is constructed as an arc surface, and the radius of the guide surface 2441 is R, wherein 5mm≤R≤9mm.

[0133] For example, the radius of the guide surface 2441 can be 5mm, 6mm, 7mm, 8mm, 9mm or any value between any two of these values.

[0134] If the radius of the guide surface 2441 is too small, the limiting effect on the cell component 23 will be poor. After the cell component 23 is engaged with the guide surface 2441, it will still be prone to tilting relative to the housing 24, and will not be able to be properly centered in the housing 24. If the radius of the guide surface 2441 is too large, it will reduce the internal space of the housing 24 too much, thus reducing the space available inside the housing 24 to accommodate the cell component 23, which is not conducive to improving the energy density of the battery 100. The radius of the guide surface 2441 is within this range, which can better ensure that the cell component 23 is centered in the housing 24 without having too much impact on the energy density of the battery 100.

[0135] In some alternative embodiments of this application, referring again to FIG7, the guide portion 244 has an outer surface 2442 located outside the housing 24, and the outer surface 2442 is configured as an arc surface.

[0136] For example, the outer surface 2442 of the guide portion 244 is an arc surface, and the inner surface of the guide portion 244 is a slope; or, both the outer surface 2442 and the inner surface of the guide portion 244 are arc surfaces. The outer surface 2442 of the guide portion 244 is an arc surface, meaning there are no sharp edges, resulting in more uniform stress throughout the guide portion 244, making it less prone to deformation and improving its appearance.

[0137] In embodiments where both the outer surface 2442 and the inner surface of the guide portion 244 are arc-shaped, the guide portion 244 can be formed by directly pressing or bending the shell 24 during molding, which is easy and convenient to manufacture. The arc-shaped guide surface 2441 can limit the position of the battery cell component 23. After the battery cell component 23 is installed in the shell 24, it can cooperate with the guide surface 2441 so that the battery cell component 23 can be centered in the shell 24.

[0138] It should be noted that the terminal posts 25 of multiple battery cells 20 are electrically connected to each other via busbars or metal sheets (such as the tabs 40 in Figure 9). During the operation of the battery cells 20, they inevitably expand and contract. Therefore, the tabs 40 are usually provided with U-shaped portions 41. When the battery cell 20 expands, the U-shaped portion 41 is stretched into a smaller U-shape, and when it contracts, the U-shaped portion 41 becomes a larger U-shape. In related technologies, the height of the terminal posts is usually set relatively high to create space between adjacent terminal posts to accommodate the U-shaped portions, which increases the height and weight of the battery cells.

[0139] When the outer surface 2442 of the guide portion 244 is a slope or arc surface, and adjacent battery cells 20 are arranged side by side, and the outer surface 2442 of the guide portion 244 of the adjacent battery cells 20 are arranged opposite each other, the outer surface 2442 of the guide portion 244 of the adjacent battery cells 20 will define a clearance space 60. The clearance space 60 can accommodate the U-shaped portion 41. As a result, the height of the pole piece 25 can be made lower, which is beneficial to reduce the mass and volume of the battery cell 20 and increase the energy density of the battery 100.

[0140] In some optional embodiments of this application, as shown in FIG7, the distance between the outer surface 2442 and the guide surface 2441 gradually increases in the direction from the open end 241 to the first shell wall 243.

[0141] For example, both the guide surface 2441 and the outer surface 2442 of the guide portion 244 are arc surfaces. The radius of the arc surface of the guide surface 2441 is larger than the radius of the guide surface 2441 of the guide portion 244, and the center of the guide surface 2441 is located closer to the inside than the center of the guide portion 244. The end of the guide portion 244 with a larger wall thickness h2 is connected to the first shell wall 243, and the end of the guide portion 244 with a smaller wall thickness h2 is connected to the second shell wall 242. In this way, the difference in wall thickness at the connection between the guide portion 244 and the first shell wall 243 will not be too large, and the difference in wall thickness at the connection between the guide portion 244 and the second shell wall 242 will not be too large. On the one hand, the structural strength of the guide portion 244 is higher, and the connection between the guide portion 244 and the first shell wall 243 and the connection between the guide portion 244 and the second shell wall 242 is less likely to break. On the other hand, it can reduce the manufacturing difficulty of the shell body 24, and the shell body 24 is more manufacturable.

[0142] In some alternative embodiments of this application, the minimum spacing between the outer surface 2442 and the guide surface 2441 is equal to the wall thickness h3 of the second shell wall 242.

[0143] In an embodiment where the distance between the outer surface 2442 and the guide surface 2441 gradually increases in the direction from the open end 241 to the first shell wall 243, the minimum distance between the outer surface 2442 and the guide surface 2441 is equal to the wall thickness h3 of the second shell wall 242. That is, the wall thickness of the end of the guide portion 244 connected to the second shell wall 242 is equal to the wall thickness h3 of the second shell wall 242. In this way, the thickness between the second shell wall 242 and the guide portion 244 will not change abruptly, the structural strength of the guide portion 244 is higher, and the integration between the guide portion 244, the first shell wall 243, and the second shell wall 242 is better.

[0144] In some embodiments, in the direction from the open end 241 to the first shell wall 243, the wall thickness h2 of the guide portion 244 gradually increases. For example, the wall thickness of the end of the guide portion 244 connected to the first shell wall 243 is equal to the wall thickness h1 of the first shell wall 243, and the wall thickness of the end of the guide portion 244 connected to the second shell wall 242 is equal to the wall thickness h3 of the second shell wall 242. In this way, there will be no abrupt change in thickness between the first shell wall 243 and the guide portion 244, and between the second shell wall 242 and the guide portion 244. The structural strength of the guide portion 244 is higher, and the integration between the guide portion 244, the first shell wall 243, and the second shell wall 242 is better.

[0145] In some optional embodiments of this application, references can be made to Figures 8 and 9, where Figure 9 is a cross-sectional view of battery cells arranged side-by-side according to some embodiments of this application. The guide portion 244 includes at least two sections connected sequentially in the direction from the second shell wall 242 toward the first shell wall 243, with the latter being closer to the mounting hole 249 than the former. Any two adjacent sections are arranged at an angle, and at least the section closer to the first shell wall 243 among the at least two sections is provided with a guide surface 2441.

[0146] For example, the guide portion 244 may include two connected sections, three sections, or four sections, etc., without specific limitations. In an embodiment where the guide portion 244 includes two sections, the section near the first shell wall 243 is provided with a guide surface 2441, or both sections are provided with a guide surface 2441. In an embodiment where the guide portion 244 includes three sections, only one section may be provided with a guide surface 2441, or two sections may be provided with a guide surface 2441, or all three sections may be provided with a guide surface 2441. In embodiments with multiple guide surfaces 2441, the multiple guide surfaces 2441 may or may not be connected to each other.

[0147] Any two adjacent segments can be set at an angle. For example, the angle between the outer surfaces 2442 of two segments can be 90 degrees, 100 degrees, 110 degrees, 120 degrees, 130 degrees, 140 degrees, 150 degrees, 160 degrees, 170 degrees, etc.

[0148] The guide surface 2441 can limit the position of the battery cell component 23. After the battery cell component 23 is installed in the housing 24, the battery cell component 23 can cooperate with the guide surface 2441 so that the battery cell component 23 can be centered in the housing 24.

[0149] It should be noted that the terminal posts 25 of multiple battery cells 20 are electrically connected to each other via busbars or metal sheets (such as the tabs 40 in Figure 9). During the operation of the battery cells 20, they inevitably expand and contract. Therefore, the tabs 40 are usually provided with U-shaped portions 41. When the battery cell 20 expands, the U-shaped portion 41 is stretched into a smaller U-shape, and when it contracts, the U-shaped portion 41 becomes a larger U-shape. In related technologies, the height of the terminal posts is usually set relatively high to create space between adjacent terminal posts to accommodate the U-shaped portions, which increases the height and weight of the battery cells.

[0150] This embodiment of the application provides a guide portion 244 comprising at least two sections arranged at an angle. When two battery cells 20 are arranged side-by-side, the outer surfaces 2442 of the two guide portions 244 of the two battery cells 20 define a clearance space 60 to accommodate the U-shaped portion 41. This allows the height of the terminal post component 25 to be lower, which helps reduce the mass and volume of the battery cell 20 and increases the energy density of the battery 100. Furthermore, the clearance space 60 formed by the guide portions 244 comprising at least two sections is larger and can also accommodate other components according to design requirements.

[0151] In some optional embodiments of this application, there are two segments, namely a first segment 2443 and a second segment 2444. The first segment 2443 is perpendicular to the second shell wall 242, and the second segment 2444 is perpendicular to the first segment 2443. The second segment 2444 is connected to the first shell wall 243, and the second segment 2444 is provided with a guide surface 2441.

[0152] On the one hand, the guide portion 244, which includes the first section 2443 and the second section 2444, can limit the position of the battery cell component 23. After the battery cell component 23 is installed in the housing 24, the battery cell component 23 can cooperate with the guide surface 2441 so that the battery cell component 23 can be centered in the housing 24. On the other hand, the guide portion 244, which only includes the first section 2443 and the second section 2444, has a simple structure, is easy to process and form, and is not easily deformed.

[0153] In some optional embodiments of this application, as shown in FIG8, a first transition angle 2445 is provided between the first segment 2443 and the second shell wall 242, and a second transition angle 2446 is provided between the second segment 2444 and the first segment 2443.

[0154] For example, a first transition chamfer or a first transition fillet may be provided between the inner wall surface of the first segment 2443 and the inner wall surface of the second shell wall 242; a first transition chamfer or a first transition fillet may be provided between the outer wall surface of the first segment 2443 and the outer wall surface of the second shell wall 242; a second transition chamfer or a second transition fillet may be provided between the inner wall surface of the second segment 2444 and the inner wall surface of the first segment 2443; a second transition chamfer or a second transition fillet may be provided between the outer wall surface of the second segment 2444 and the outer wall surface of the first segment 2443; a third transition chamfer or a third transition fillet may be provided between the inner wall surface of the second segment 2444 and the inner wall surface of the first shell wall 243; and a third transition chamfer or a third transition fillet may be provided between the outer wall surface of the second segment 2444 and the outer wall surface of the first shell wall 243.

[0155] This allows for a smooth transition between the first segment 2443 and the second shell wall 242, between the first segment 2443 and the second segment 2444, and between the second segment 2444 and the first shell wall 243. This facilitates processing, enhances manufacturability, and makes it easy to form a single piece. It also reduces stress at the connection points between the first segment 2443 and the second shell wall 242, between the second segment 2444 and the first segment 2443, and between the second segment 2444 and the first shell wall 243.

[0156] According to some embodiments of this application, references can be made to Figures 10 to 13, wherein Figure 10 is a top view of a battery cell provided in some embodiments of this application; Figure 11 is a cross-sectional view along line AA in Figure 10; Figure 12 is a cross-sectional view of a battery cell provided in some other embodiments of this application; and Figure 13 is a partial enlarged view of Figure 12. The surface of the terminal body 251 facing the end of the cell component 23 (i.e., the surface facing the active material coating portion 231) is the inner end surface 2511 of the terminal body, and the cell component 23 is connected to the inner end surface 2511 of the terminal body through a conductive portion 26 (e.g., a tab portion 232 or a conductive element 261).

[0157] The electrode component includes one or more electrode assemblies 235. The portion of the current collector in the electrode assembly 235 coated with an active material layer constitutes an active material coated portion 231, and the portion not coated with an active material layer constitutes an electrode tab portion 232.

[0158] This reduces the difficulty of assembling and connecting the conductive part 26 and the electrode body 251, improves processing efficiency, and helps to shorten the length of the conductive part 26, saving materials and costs.

[0159] According to some embodiments of this application, please refer again to Figures 11 and 13. At least a portion of the conductive part 26 is laid on the inner end face 2511 of the electrode body. Thus, by laying at least a portion of the conductive part 26 on the inner end face 2511 of the electrode body, the at least portion of the conductive part 26 is laid flat, and the projection of the at least portion of the conductive part 26 falls on the inner end face 2511 of the electrode body. This improves the connection reliability between the conductive part 26 and the electrode body 251, increases the connection area between the conductive part 26 and the electrode body 251, and enhances conductivity.

[0160] Referring again to the figures, exemplarily, when the battery cell 20 is in an assembled state (e.g., as shown in Figures 21 and 23), the inner end face of the terminal body 251 is parallel to the axial section 236 of the cell component, and the direction of the tab of the cell component 23 is the direction in which the active material coating portion 231 extends out of the tab portion 232, which is perpendicular to the first shell wall 242. This facilitates the processing and design of the terminal body 251.

[0161] According to some embodiments of this application, when the battery cell 20 is in the assembled state (for example, as shown in FIG16, FIG16 is a structural schematic diagram of the cell component and the terminal component in the battery cell provided in some embodiments of this application), the inner end face 2511 of the terminal body is inclined relative to the axial section 236 of the cell component, and the axial section 236 of the cell component is perpendicular to the output tab direction of the cell component 23.

[0162] The tab direction of the battery cell component 23 is the direction in which the active material coating portion 231 extends out of the tab portion 232, and this direction is perpendicular to the first shell wall 242. In this way, before laying at least a portion of the conductive part 26 on the inner end face of the electrode body 251, the electrode component 25 can be adjusted so that the inner end face of the electrode body 251 is parallel to the output tab direction of the cell component 23. This facilitates laying at least a portion of the conductive part 26 on the inner end face of the electrode body 251, providing a larger welding operation space. Moreover, at this time, the line connecting the two ends of the electrode body 251 (i.e., the end closer to the cell component 23 and the end farther from the cell component 23) is inclined to the output tab direction of the cell component 23. Thus, after the conductive part 26 is connected to the electrode body 251, the electrode component 25 can be rotated less than 90°, which satisfies the requirement that the line connecting the two ends of the electrode body 251 is parallel to the second shell wall 243 or the cover plate 22. This allows the inner end face of the electrode body 251 to be parallel to the axial section 236 of the cell component, reducing the rotation angle of the electrode component 25 and shortening the length of the conductive part 26.

[0163] According to some embodiments of this application, as shown in FIG11, the battery cell component 23 includes an active material coating portion 231 housed in a receiving cavity 204, and an electrode portion 232 connected to the active material coating portion 231. The electrode portion 232 includes a gathering portion 234 formed by stacking and connecting multiple layers of electrode sheets 233.

[0164] In this way, the multi-layered tabs 233 are connected to form a converged portion 234, making the multi-layered tabs 233 in the converged portion 234 electrically conductive. That is, the multi-layered tabs 233 in the converged portion 234 not only have a stacked arrangement, but also have a connected and conductive relationship. The connection method of the multi-layered tabs 233 in the converged portion 234 is not limited, and can be welding (such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure welding, or brazing, etc.), through-hole connection, or bonding with conductive adhesive, etc. For example, multi-layered tabs 233 of the same polarity can be ultrasonically welded, and the resulting ultrasonic weld mark is the converged portion 234.

[0165] For example, the multiple layers of tabs 233 in the gathering portion 234 may belong to the same electrode assembly 235 or to different electrode assemblies 235. That is, several layers of tabs 233 of the same polarity in the same electrode assembly 235 can be connected to form the gathering portion 234, or several layers of tabs 233 of the same polarity in different electrode assemblies 235 can be connected to form the gathering portion 234. For example, all the tabs 233 of the same polarity in the electrode component can be connected to form the gathering portion 234, which can reduce the number of gathering portions 234.

[0166] In the above technical solution, by pre-connecting multiple layers of tabs 233 in the tab portion 232 to form a gathering portion 234, the gathering portion 234 can present a plate shape with multiple layers of tabs 233 connected together and having a certain rigidity, rather than a loose and scattered multi-layer foil shape. This facilitates the assembly and connection operations of the tab portion 232 with other components, such as perforation and welding operations. It also makes it less likely for gaps to form in the weld seam formed between the tab portion 232 and other components, which can improve the connection reliability and conductivity of the weld, and make the conductivity between the electrode component and the pole component 25 more stable and reliable.

[0167] According to some embodiments of this application, please refer to FIG11 again, at least a portion of the gathering portion 234 is laid on the inner end face 2511 of the pole body and connected to the inner end face 2511 of the pole body.

[0168] At this time, the conductive part 26 may only include the tab 232, and the tab 232 is directly connected to the electrode body 251, thereby eliminating the need for the connection step between the conductive component 261 and the tab 232. Moreover, by pre-connecting multiple layers of tabs 233 in the tab 232 to form a gathered part 234, the gathered part 234 can present a plate shape with a certain rigidity where multiple layers of tabs 233 are connected together, rather than a loose, scattered multi-layer foil shape. This facilitates the mating connection between the tab 232 and the electrode body 251, making the welding of the tab 232 and the electrode body 251 more reliable. Voids are less likely to form in the weld, which can improve the connection reliability and conductivity at the weld, making the conductivity between the electrode component and the electrode component 25 more stable and reliable. Furthermore, by laying the gathering part 234 on the inner end face 2511 of the pole body, the gathering part 234 is laid flat and flat, with at least a portion of the gathering part 234 resting on the inner end face 2511 of the pole body. This prevents damage to the electrode tab 232 due to bending of the gathering part 234, improves conductivity, and facilitates welding of the clamping nozzle to press the gathering part 234, thereby improving the reliability of the connection between the gathering part 234 and the pole body 251.

[0169] According to some embodiments of this application, please refer to FIG11 again, the entire gathering portion 234 is laid on the inner end face 2511 of the pole body.

[0170] That is, the inner end face 2511 of the pole body is greater than or equal to the area of ​​the closing part 234, so that the closing part 234 can completely fall on the inner end face 2511 of the pole body, thereby increasing the connection area between the inner end face 2511 of the pole body and the closing part 234 and improving the current carrying efficiency.

[0171] According to some embodiments of this application, as shown in Figures 12 to 14, the battery cell component 23 includes an active material coating portion 231 housed in a receiving cavity 204, and an electrode portion 232 connected to the active material coating portion 231. The electrode portion 232 is connected to the electrode post body 251 via a conductive member 261.

[0172] Therefore, by indirectly connecting the tab 232 and the terminal body 251 through the conductive element 261, the length of the tab 232 can be shortened, improving issues such as wrinkling, bending, and breakage of the tab 233. Furthermore, the shape and material of the conductive element 261 can be flexibly designed to reduce the difficulty of connecting it to the terminal body 251, thus improving the ease of connection. In addition, the perforation operation of the conductive part 26, the connection operation between the conductive part 26 and the terminal component 25 (which can be omitted), and the connection operation between the terminal component 25 and the housing component 21 are all less likely to cause cracking at the connection point between the active material coating part 231 and the tab 232, thereby improving the reliability of the battery cell 20.

[0173] The electrode tab 232 of the electrode component includes a stacked tab 237 formed by stacking and gathering multiple tabs 233. The multiple tabs 233 in the stacked tab 237 are connected to form a gathered portion 234. That is, the electrode tab 232 includes a gathered portion 234 formed by stacking and connecting multiple tabs 233.

[0174] For example, the laminated portion 237 can be connected to the conductive member 261, thereby eliminating the step of connecting the laminated portion 237 to form the closing portion 234. Alternatively, for example, the multilayer tabs 233 in the laminated portion 237 can be connected to form the closing portion 234 before connecting the closing portion 234 to the conductive member 261, thereby allowing for flexible and diverse design of the structural form of the conductive member 261.

[0175] For example, the conductive element 261 can be connected to the inner end face 2511 of the electrode body, thereby shortening the length of the conductive element 261. For instance, referring to FIG14, the conductive element 261 may include a second connecting segment 2613, which can be laid on and connected to the inner end face 2511 of the electrode body, thereby improving the connection reliability and conductivity between the conductive element 261 and the electrode body 251. Alternatively, for example, the conductive element 261 can also be connected to other locations on the electrode body 251, such as pre-embedding the conductive element 261 in the electrode body 251 or passing through the electrode body 251 for connection.

[0176] According to some embodiments of this application, as shown in FIG14, the conductive member 261 includes a first connecting segment 2611, the first connecting segment 2611 includes two clamping portions 2612, and the electrode portion 232 includes an electrode end portion 2321, which is clamped between the two clamping portions 2612 and connected to the clamping portions 2612.

[0177] The tab end 2321 can be either a stacked portion 237 or a gathered portion 234. Thus, the two clamping portions 2612 can be used to limit the tab end 2321, improving the connection reliability of the multiple tab pieces 233 in the tab end 2321. Furthermore, in some examples, by providing two clamping portions 2612, the tab end 2321 clamped between the two clamping portions 2612 can be in the state of a stacked portion 237, eliminating the step of connecting the multiple tab pieces 233 in the stacked portion 237 to form the gathered portion 234, thereby simplifying the processing steps and improving processing efficiency.

[0178] According to some embodiments of this application, please refer again to FIG14. The surface of the end of the electrode body 251 facing the cell component 23 is the inner end face 2511 of the electrode body. The conductive member 261 includes a second connecting segment 2613. The second connecting segment 2613 is laid on the inner end face 2511 of the electrode body and connected to the inner end face 2511 of the electrode body. The conductive member 261 is bent at the connection position of the first connecting segment 2611 and the second connecting segment 2613 so that the first connecting segment 2611 is located on the side of the second connecting segment 2613 away from the electrode body 251. One of the clamping parts 2612 is supported on the side of the tab end 2321 away from the electrode body 251.

[0179] Therefore, by supporting the tab portion 232 with the clamping portion 2612, the redundancy of the tab portion 232 can be improved, and the risk of short circuit caused by the tab portion 232 being inserted into the active material coating portion 231 can be reduced. Moreover, the bent conductive part 261 can play a buffer support role, reducing the risk of the electrode component hitting the housing component 21 and improving the reliability of the battery cell 20.

[0180] According to some embodiments of this application, the tab portion 232 includes a gathering portion 234 formed by stacking and connecting multiple tab sheets 233, and the conductive member 261 includes a first connecting segment 2611. The gathering portion 234 is stacked on one side of the first connecting segment 2611 in the thickness direction and connected to the first connecting segment 2611.

[0181] The first connecting section 2611 is in the form of a plate. The thickness direction of the first connecting section 2611 is consistent with that of the gathering part 234. The two are stacked along the thickness direction of the first connecting section 2611, so the cooperation between the gathering part 234 and the conductive part 261 is simple and conducive to improving production efficiency.

[0182] According to some embodiments of this application, the surface of the electrode post body 251 facing the cell component 23 is the inner end face 2511 of the electrode post body. The first connecting section 2611 supports the side of the gathering portion 234 away from the electrode post body 251, so that the gathering portion 234 is sandwiched between the inner end face 2511 of the electrode post body and the first connecting section 2611. Thus, by supporting the gathering portion 234 with the first connecting section 2611, the redundancy of the tab portion 232 can be improved, and the risk of short circuit caused by the tab portion 232 being inserted backward into the active material coating portion 231 can be reduced.

[0183] According to some embodiments of this application, the battery cell 20 further includes a pressure relief device 27, which is disposed on the housing component 21 and is located on the same side or opposite side of the terminal component 25.

[0184] For example, the pressure relief device 27 can be an explosion-proof valve installed on the housing component 21, or it can be integrally formed on the thinned area of ​​the housing component 21. Thus, by providing the pressure relief device 27, when the pressure inside the housing component 21 exceeds a preset value, the pressure can be directionally released through the pressure relief device 27, thereby improving the safety and reliability of the battery cell 20.

[0185] For example, referring to FIG15, FIG15 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application; the pressure relief device 27 and the terminal post component 25 are located on the same side. Since the terminal post component 25 is disposed on the second shell wall 242, when the pressure relief device 27 is also disposed on the second shell wall 242, the pressure relief device 27 and the terminal post component 25 are located on the same side. Thus, the design of other shell walls besides the second shell wall 242 can be simplified, and the structure and processing of the battery cell 20 can be simplified.

[0186] For example, referring to FIG10, FIG10 is a top view of a battery cell provided in some embodiments of the present application; the pressure relief device 27 and the terminal post component 25 are located on opposite sides. Since the terminal post component 25 is disposed on the second shell wall 242, when the pressure relief device 27 is also disposed on other walls of the shell component 21 other than the second shell wall 242, for example, when the pressure relief device 27 is disposed on the cover plate 22, the pressure relief device 27 and the terminal post component 25 are located on opposite sides. Therefore, there is no need to consider reducing the volume of the terminal post component 25 by occupying the space of the second shell wall 242 for the pressure relief device 27, so that the shape and volume of the terminal post component 25 can be flexibly designed as needed.

[0187] According to some embodiments of this application, please refer again to Figures 11 and 13. The pole component 25 includes a pole body 251, a transition structure 252 and an insulating sealing structure 253. The transition structure 252 surrounds the pole body 251 and is connected to the cover plate 22 or the housing 24. The insulating sealing structure 253 is insulating and sealingly fitted between the transition structure 252 and the pole body 251.

[0188] The adapter structure 252 surrounds the entire circumference of the terminal body 251 along the mounting hole 249, thereby connecting the terminal body 251 to the second shell wall 242 or connecting the terminal body 251 to the cover plate 22 in the outer peripheral area of ​​the terminal body 251. The insulating and sealing structure 253 insulates the adapter structure 252 from the terminal body 251 and seals the mating position of the adapter structure 252 and the terminal body 251. After the adapter structure 252 is connected to the housing component 21, it isolates the inside and outside of the housing component 21, reducing the risk of electrolyte leakage from the housing component 21 to the outside of the housing component 21 through the mating position of the adapter structure 252 and the terminal body 251, and reducing the risk of liquids or dust from the outside of the housing component 21 entering the housing component 21 through the mating position of the adapter structure 252 and the terminal body 251, thereby improving the reliability of the battery cell 20.

[0189] In the above technical solution, since the pole member 25 includes not only the pole body 251 but also a transition structure 252 connected to the housing member 21, and an insulating sealing structure 253 is provided between the transition structure 252 and the pole body 251 to provide insulation and sealing, when installing the pole member 25 to the housing member 21 and connecting the transition structure 252 to the housing member 21, there is no need to provide a seal between the transition structure 252 and the housing member 21, and there is no need to apply a large sealing pressure to meet the compression degree of the seal. This reduces the stress on the second housing wall 242 or the cover plate 22, thus protecting the housing member 21 and helping to reduce the wall thickness of the housing member 21 and reduce material costs. In addition, when the second housing wall 242 is the end of the housing body 24 opposite to the opening, the stress at the connection between the first housing wall 243 and the second housing wall 242 and the stress on the first housing wall 243 can be reduced, which helps to ensure the reliability of the housing member 21 and reduce the wall thickness and cost of the housing member 21.

[0190] According to some embodiments of this application, please refer again to FIG10. The transition structure 252 is formed as an elongated strip (such as a rectangle or racetrack shape) extending along the length direction of the first shell wall 243. The outline shape of the electrode body 251 matches the outline shape of the transition structure 252 (such as a rectangle or racetrack shape). As mentioned above, the cell component 23 is connected to the electrode component 25 through the conductive part 26. When the outline shape of the electrode body 251 is formed as an elongated strip that matches the outline shape of the transition structure 252, the area of ​​the electrode body 251 is larger, which is beneficial to increasing the connection area between the conductive part 26 and the electrode body 251, thereby improving the conductivity.

[0191] In other embodiments of this application, referring again to FIG14, the adapter structure 252 is formed as an elongated strip (such as a rectangle or racetrack shape) extending along the length direction of the first shell wall 243, and the pole body 251 is located at the center of the length of the adapter structure 252 and is circular. Therefore, the connection point between the adapter structure 252 and the pole body 251 is subjected to uniform force, making it easier to control the compression of the insulating sealing structure 253, thereby improving the reliability of their sealing fit.

[0192] The following describes, with reference to the accompanying drawings, six specific embodiments of the present invention, including a battery cell 20, a battery 100 having the battery cell 20, and a vehicle 1000 having the battery 100.

[0193] Example 1

[0194] Referring to Figures 3 to 5, the vehicle includes a battery 100, which includes a battery cell 20. The battery cell 20 includes a housing component 21, a terminal component 25, and a cell component 23. The housing component 21 includes a shell 24, with an open end 241 and a first shell wall 243 formed at opposite ends. The first shell wall 243 has mounting holes 249. At least one side of the shell 24 adjacent to the first shell wall 243 is a second shell wall 242. A guide portion 244 is provided between the second shell wall 242 and the first shell wall 243. The guide portion 244 includes components located at... The guide surface 2441 inside the housing 24 gradually increases the distance between the guide surface 2441 and the inner wall surface of the second housing wall 242 in the direction from the open end 241 to the first housing wall 243. The electrode post component 25 is installed on the first housing wall 243 and covers the mounting hole 249. The electrode post component 25 includes an electrode post body 251 disposed opposite to the mounting hole 249. The cell component 23 is housed in the housing 24 and includes an electrode assembly 235. The tabs 233 of the electrode assembly 235 are connected to form a folding portion 234, which is connected to the electrode post body 251. The housing 24 has a first direction F1 and a second direction F2 parallel to the outer wall surface of the first housing wall 243. The size of the first housing wall 243 in the first direction F1 is larger than the size of the first housing wall 243 in the second direction F2. The housing 24 forms a second housing wall 242 at both ends of the first direction F1 and the second direction F2. In the direction perpendicular to the second shell wall 242, the dimension D1 of the first shell wall 243 is smaller than the distance D2 between the second shell wall 242 and the opposite shell wall, and the first shell wall 243 is connected to the second shell wall 242 through the guide portion 244.

[0195] The wall thickness h2 of the guide portion 244 and the wall thickness h3 of the second shell wall 242 are less than the wall thickness h1 of the first shell wall 243. The guide portion 244 has an outer surface 2442 located outside the shell body 24. The outer surface 2442 is parallel to the guide surface 2441. The distance between the outer surface 2442 and the guide surface 2441 is equal to the wall thickness h3 of the second shell wall 242. The guide surface 2441 is constructed as an inclined surface.

[0196] Example 2

[0197] Referring to FIG7, the vehicle includes a battery 100, which includes a battery cell 20. The battery cell 20 includes a housing component 21, a terminal component 25, and a cell component 23. The housing component 21 includes a shell 24, with an open end 241 and a first shell wall 243 formed at opposite ends of the shell 24. The first shell wall 243 is provided with a mounting hole 249. At least one side of the shell 24 adjacent to the first shell wall 243 is a second shell wall 242. A guide portion 244 is provided between the second shell wall 242 and the first shell wall 243. The guide portion 244 includes a portion located on the shell 24. The guide surface 2441 inside the housing 24 gradually increases the distance between the guide surface 2441 and the inner wall surface of the second housing wall 242 in the direction from the open end 241 to the first housing wall 243. The electrode post component 25 is installed on the first housing wall 243 and covers the mounting hole 249. The electrode post component 25 includes an electrode post body 251 disposed opposite to the mounting hole 249. The cell component 23 is housed in the housing 24 and includes an electrode assembly 235. The tabs 233 of the electrode assembly 235 are connected to form a folding portion 234, which is connected to the electrode post body 251. The housing 24 has a first direction F1 and a second direction F2 parallel to the outer wall surface of the first housing wall 243. The size of the first housing wall 243 in the first direction F1 is larger than the size of the first housing wall 243 in the second direction F2. The housing 24 forms a second housing wall 242 at both ends of the first direction F1 and the second direction F2. In the direction perpendicular to the second shell wall 242, the dimension D1 of the first shell wall 243 is smaller than the distance D2 between the second shell wall 242 and the opposite shell wall, and the first shell wall 243 is connected to the second shell wall 242 through the guide portion 244.

[0198] The wall thickness h2 of the guide portion 244 and the wall thickness h3 of the second shell wall 242 are less than the wall thickness h1 of the first shell wall 243. The guide portion 244 has an outer surface 2442 located outside the shell body 24, and the guide surface 2441 is constructed as an arc surface with a radius of 7 mm. The guide portion 244 has an outer surface 2442 located outside the shell body 24, and the outer surface 2442 is constructed as an arc surface. In the direction from the open end 241 to the first shell wall 243, the distance between the outer surface 2442 and the guide surface 2441 gradually increases.

[0199] Example 2

[0200] Referring to Figures 8 and 9, the vehicle includes a battery 100, which includes a battery cell 20. The battery cell 20 includes a housing component 21, a terminal component 25, and a cell component 23. The housing component 21 includes a shell 24, with an open end 241 and a first shell wall 243 formed at opposite ends. The first shell wall 243 has mounting holes 249. At least one side of the shell 24 adjacent to the first shell wall 243 is a second shell wall 242. The second shell wall 242 and the first shell wall 243... A guide portion 244 is provided between the housing body 24 and the first housing wall 242. The guide portion 244 includes a guide surface 2441 located inside the housing body 24. In the direction from the open end 241 to the first housing wall 243, the distance between the guide surface 2441 and the inner wall surface of the second housing wall 242 gradually increases. The electrode post component 25 is installed on the first housing wall 243 and covers the mounting hole 249. The electrode post component 25 includes an electrode post body 251 disposed opposite to the mounting hole 249. The cell component 23 is housed in the housing body 24 and includes an electrode assembly 235. The tabs 233 of the electrode assembly 235 are connected to form a closing portion 234, which is connected to the electrode post body 251. The housing body 24 has a first direction F1 and a second direction F2 parallel to the outer wall surface of the first housing wall 243. The size of the first housing wall 243 in the first direction F1 is larger than the size of the first housing wall 243 in the second direction F2. The two ends of the housing body 24 in the first direction F1 and the two ends in the second direction F2 form the second housing wall 242. In the direction perpendicular to the second shell wall 242, the dimension D1 of the first shell wall 243 is smaller than the distance D2 between the second shell wall 242 and the opposite shell wall, and the first shell wall 243 is connected to the second shell wall 242 through the guide portion 244.

[0201] The guide section 244 includes two sections, namely a first section 2443 and a second section 2444. The two sections are connected sequentially in the direction from the second shell wall 242 towards the first shell wall 243, with the latter being closer to the mounting hole 249 than the former. The two sections are arranged at an angle, and at least the section closer to the first shell wall 243 has a guide surface 2441. The first section 2443 is perpendicular to the second shell wall 242, and the second section 2444 is perpendicular to the first section 2443, connected to the first shell wall 243, and also has the guide surface 2441.

[0202] This embodiment solves the problem of asymmetry between the battery cell component 23 and the housing 24 after installation, and the resulting expansion force pulling on the tabs 233, thus reducing the difficulty of installing the battery cell component 23 into the housing. The connection between the first housing wall 243 and the second housing wall 242 is made into a guide slope, and the internal insulation component 238 is adjusted accordingly to limit the position of the battery cell component 23 after installation. The connection between the first housing wall 243 and the second housing wall 242 is changed from a two-stage first housing wall 243 / second housing wall 242 thickness to a three-stage first housing wall 243 / guide portion 244 / second housing wall 242 thickness to meet the requirements of limiting position after installation and increasing the strength of the first housing wall 243.

[0203] The width of the first shell wall 243 is reduced, resulting in less deflection during pull-out and pole push-torsion operations, and higher riveting strength with the pole component 25. Alternatively, while meeting the pull-out and pole push-torsion strength requirements, the thickness of the first shell wall 243 can be reduced to increase energy density and reduce weight.

[0204] According to some embodiments of this application, this application also provides a battery 100, which includes a battery cell 20 of any of the above embodiments.

[0205] In the above technical solution, the assembly difficulty of the battery cell 20 is low. After the cell component 23 is installed into the housing component 21, it can be aligned with the housing body 24, which reduces the possibility of the tab 233 and the terminal body 251 being pulled and broken, and can improve the reliability of the battery 100.

[0206] According to some embodiments of this application, the battery 100 includes a housing assembly 10, multiple battery cells 20 are housed in the housing assembly 10, the bottom of the housing assembly 10 is a housing bottom plate, and the housing component 21 includes a cover plate 22 covering the opening of the housing body 24, the opening of the housing body 24 facing the housing bottom plate, and the cover plate 22 covering the bottom of the housing body 24; or, the opening of the housing body 24 is away from the housing bottom plate, and the cover plate 22 covers the top of the housing body 24.

[0207] In other words, for example, cover plate 22 is placed on the bottom of housing 24, and pressure relief device 27 is located on cover plate 22; or, cover plate 22 is placed on the top of housing 24, and pressure relief device 27 is located on the second housing wall 242 opposite to cover plate 22. In this way, if a battery cell 20 experiences thermal runaway, the battery cell 20 can be depressurized from the bottom, eliminating the need for a central venting channel and further freeing up space for the battery cell 20, which is beneficial for improving the energy density of battery 100. Simultaneously, directional pressure relief can be quickly achieved, allowing ejected material to be rapidly discharged in a designated direction through an optimal channel, preventing it from spreading to surrounding cells. For example, cover plate 22 is placed on the top of housing 24, with the battery cell 20 in an upright position, preventing electrolyte leakage. Therefore, flexible positioning of the battery cell 20 and housing assembly 10 can be achieved.

[0208] 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 embodiments; or, includes a battery 100 of any of the above embodiments. The battery cell 20 or the battery 100 is used to provide electrical energy to the electrical device.

[0209] In the above technical solution, the power device uses the battery 100 or battery cell 20. When assembling the battery cell 20, the assembly difficulty is low. After the cell component 23 is installed into the housing component 21, it can be aligned with the housing body 24, which reduces the possibility of the tab 233 and the terminal body 251 being pulled and broken, improves the reliability of the battery 100, and helps to improve the performance of the power device.

[0210] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0211] 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, wherein, include: A housing component includes a housing body, with an open end and a first housing wall formed at opposite ends of the housing body, the first housing wall having a mounting hole, and at least one side of the housing body adjacent to the first housing wall being a second housing wall, a guide portion being provided between the second housing wall and the first housing wall, the guide portion including a guide surface located inside the housing body, and the distance between the guide surface and the inner wall surface of the second housing wall gradually increasing in the direction from the open end to the first housing wall; An electrode post component is installed on the first housing wall and covers the mounting hole. The electrode post component includes an electrode post body disposed opposite to the mounting hole. The battery cell component is housed in the cavity of the housing and connected to the terminal body.

2. The battery cell according to claim 1, wherein, The shell body forms the second shell wall on at least two sides adjacent to the first shell wall.

3. The battery cell according to claim 2, wherein, The shell body has a first direction and a second direction parallel to the outer wall surface of the first shell wall. The size of the first shell wall in the first direction is larger than the size of the first shell wall in the second direction. The shell body is located at both ends of the first direction and both ends of the second direction to form the second shell wall.

4. The battery cell according to any one of claims 1 to 3, wherein, In a direction perpendicular to the second shell wall, the size of the first shell wall is smaller than the distance between the second shell wall and the opposite shell wall, and the first shell wall is connected to the second shell wall through the guide portion.

5. The battery cell according to claim 4, wherein, The wall thickness of the guide portion and the wall thickness of the second shell are less than the wall thickness of the first shell.

6. The battery cell according to claim 5, wherein, The guide surface is constructed as an inclined plane.

7. The battery cell according to claim 6, wherein, The guide portion has an outer side located outside the housing, and the outer side is parallel to the guide surface.

8. The battery cell according to claim 7, wherein, The distance between the outer side surface and the guide surface is equal to the wall thickness of the second shell wall.

9. The battery cell according to claim 5, wherein, The guide surface is constructed as an arc surface with a radius of R, where 5mm ≤ R ≤ 9mm.

10. The battery cell according to claim 9, wherein, The guide portion has an outer surface located outside the housing, and the outer surface is constructed as an arc surface.

11. The battery cell according to claim 10, wherein, In the direction from the open end toward the first shell wall, the distance between the outer side surface and the guide surface gradually increases.

12. The battery cell according to claim 11, wherein, The minimum distance between the outer side surface and the guide surface is equal to the wall thickness of the second shell wall.

13. The battery cell according to any one of claims 4 to 12, wherein, The guide portion includes at least two sections. In the direction from the second shell wall to the first shell wall, at least two of the sections are connected sequentially, and the latter is closer to the mounting hole than the former. Any two adjacent sections are arranged at an angle, and at least one of the at least two sections is provided with the guide surface in the section closer to the first shell wall.

14. The battery cell according to claim 13, wherein, The segment consists of two parts, namely a first segment and a second segment. The first segment is perpendicular to the second shell wall, and the second segment is perpendicular to the first segment and connected to the first shell wall, and is provided with the guide surface.

15. The battery cell according to claim 14, wherein, A first transition angle is provided between the first section and the second shell wall, and a second transition angle is provided between the second section and the first section.

16. The battery cell according to any one of claims 1-15, wherein, The surface of the electrode body facing the cell component is the inner end face of the electrode body, and the cell component is connected to the inner end face of the electrode body through a conductive part.

17. The battery cell according to claim 16, wherein, The battery cell component includes an active material coating portion housed in the receiving cavity, and an electrode portion connected to the active material coating portion. The electrode portion includes a gathering portion formed by stacking and connecting multiple layers of electrode sheets. At least a portion of the gathering portion is laid on the inner end face of the electrode body and connected to the inner end face of the electrode body.

18. The battery cell according to any one of claims 1-16, wherein, The battery cell component includes an active material coating portion housed in the receiving cavity, and an electrode portion connected to the active material coating portion, the electrode portion being connected to the electrode body via a conductive element.

19. The battery cell according to claim 18, wherein, The conductive component includes a first connecting segment, which includes two clamping portions. The electrode portion includes an electrode end, which is clamped between the two clamping portions and connected to the clamping portions.

20. The battery cell according to claim 19, wherein, The surface of the electrode body facing the cell component is the inner end face of the electrode body. The conductive element includes a second connecting segment, which is laid on the inner end face of the electrode body and connected to the inner end face of the electrode body. The conductive element is bent at the connection position between the first connecting segment and the second connecting segment so that the first connecting segment is located on the side of the second connecting segment away from the electrode body. One of the clamping portions is supported on the side of the tab end away from the electrode body.

21. The battery cell according to claim 20, wherein, The tab portion includes a gathered portion formed by stacking and connecting multiple tab sheets, and the conductive element includes a first connecting segment. The gathered portion is stacked on one side of the first connecting segment in the thickness direction and connected to the first connecting segment.

22. The battery cell according to claim 21, wherein, The surface of the electrode body facing the cell component is the inner end face of the electrode body. The first connecting section is supported on the side of the folding part away from the electrode body, so that the folding part is sandwiched between the inner end face of the electrode body and the first connecting section.

23. The battery cell according to any one of claims 1-22, wherein, It also includes a pressure relief device, which is located on the housing component and on the same side or opposite side as the pole component.

24. The battery cell according to any one of claims 1-23, wherein, The pole component includes a pole body, a transition structure, and an insulating and sealing structure. The transition structure surrounds the pole body and is connected to the first shell wall. The insulating and sealing structure is insulating and sealingly fitted between the transition structure and the pole body.

25. The battery cell according to claim 24, wherein, The transition structure is formed as an elongated strip extending along the length of the first shell wall, and the outline shape of the pole body matches the outline shape of the transition structure. Alternatively, the transition structure may be formed as an elongated strip extending along the length of the first shell wall, and the pole body may be located at the center of the length of the transition structure and be circular.

26. A battery, wherein, Includes the battery cell as described in any one of claims 1 to 25.

27. The battery according to claim 26, wherein, The battery includes a housing assembly, and multiple battery cells are housed within the housing assembly. The bottom of the housing assembly is a housing bottom plate. The housing component includes a cover plate covering an opening of the housing body, with the opening of the housing body facing the housing bottom plate and the cover plate covering the bottom of the housing body; or, the opening of the housing body is away from the housing bottom plate, and the cover plate covering the top of the housing body.

28. An electrical appliance, wherein, Includes the battery cell as described in any one of claims 1 to 25, or the battery as described in claim 26 or 27.

Images