Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises a shell, an electrode assembly, an electrode terminal and a reinforcing structure. The shell comprises a wall part, and the wall part has an electrode lead-out hole. The electrode assembly is accommodated in the shell. The electrode terminal is arranged at the electrode lead-out hole and electrically connected to the electrode assembly. The reinforcing structure is arranged on the wall part, and the number of the reinforcing structure is multiple. The multiple reinforcing structures are distributed along the circumference of the electrode lead-out hole. The application is beneficial to improving the reliability of the battery monomer.

Description

Technical Field

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

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, among others.

[0003] In the development of battery technology, how to improve the reliability of individual battery cells is a technical problem that urgently needs to be solved. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which helps to improve the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, comprising: a housing including a wall portion having an electrode lead-out hole; an electrode assembly housed within the housing; an electrode terminal disposed in the electrode lead-out hole and electrically connected to the electrode assembly; and a reinforcing structure disposed in the wall portion, wherein the number of reinforcing structures is plurality of, and the plurality of reinforcing structures are distributed circumferentially along the electrode lead-out hole.

[0006] In some embodiments of the first aspect, by providing multiple reinforcing structures distributed circumferentially along the electrode lead-out holes in the wall portion, it is beneficial to improve the structural strength of the wall portion, especially to improve the structural strength of the wall portion surrounding the electrode lead-out holes, so as to avoid deformation or even damage in this area when the internal pressure of the battery cell is too high, thereby improving the reliability of the battery cell.

[0007] In some embodiments, at least one reinforcing structure intersects the edge of the electrode lead-out hole.

[0008] The above technical solution is beneficial to further improve the strength of the area near the electrode lead-out hole of the wall, thereby further improving the reliability of the battery cell.

[0009] In some embodiments, the reinforcing structure has a first end and a second end, the first end being closer to the electrode lead-out hole than the second end. In two adjacent reinforcing structures, the minimum distance between the first end of one reinforcing structure and the first end of the other reinforcing structure is less than the minimum distance between the second end of one reinforcing structure and the second end of the other reinforcing structure.

[0010] In the above technical solution, the multiple reinforcing structures are arranged more densely at the end facing the electrode lead-out hole, which is beneficial to further improve the structural strength of the wall surrounding the electrode lead-out hole.

[0011] In some embodiments, the second end of the reinforcing structure is spaced apart from the edge of the wall. This arrangement facilitates the processing and shaping of the wall.

[0012] In some embodiments, the minimum distance between the second end and the edge of the wall is R, where 4mm ≤ R ≤ 11mm.

[0013] By setting it up in the above way, we can not only meet the processing requirements of the wall, but also ensure the strengthening effect of the reinforcing structure on the structural strength of the wall.

[0014] In some embodiments, 6mm ≤ R ≤ 8mm. This configuration better balances the processing and fabrication of the wall portion with the enhancement of its structural strength.

[0015] In some embodiments, the wall portion has a first surface facing or away from the electrode assembly along its own thickness direction, and a reinforcing structure protrudes from the first surface.

[0016] In the above technical solution, by setting the reinforcing structure to protrude from the first surface along the thickness direction, it helps to enhance the deformation resistance of the wall and ensure the structural reliability of the wall.

[0017] In some embodiments, the wall portion further has a second surface opposite to the first surface, the wall portion is provided with a groove, the groove is recessed from the second surface toward the first surface, and a reinforcing structure protruding from the first surface is formed at a position of the wall portion corresponding to the groove.

[0018] In the above technical solution, the wall is also provided with a groove at the position opposite to the reinforcing structure. When the wall is subjected to the internal pressure of the battery cell, the combination of the groove and the reinforcing structure can help enhance the deformation resistance of the wall to ensure the structural reliability of the wall.

[0019] In some embodiments, the first surface is the surface of the wall portion facing the electrode assembly, and the second surface is the surface of the wall portion facing away from the electrode assembly.

[0020] In the above technical solution, by setting the reinforcing structure toward the inside of the battery cell, the space occupied by the battery cell can be reduced.

[0021] In some embodiments, in the thickness direction, the ratio between the distance L between the top end of the reinforcing structure and the bottom end of the groove and the thickness D of the wall satisfies: 0.5≤L / D≤1.

[0022] In the above technical solution, by setting the L / D ratio within the above range, the strengthening effect of the reinforcing structure on the structural strength of the wall can be better improved.

[0023] In some embodiments, 0.15mm≤L≤1.2mm, 0.3mm≤D≤1.2mm.

[0024] In some embodiments, 0.7 ≤ L / D < 1. This configuration can further improve the structural strength of the wall.

[0025] In some embodiments, 0.28mm ≤ L < 0.8mm, 0.4mm ≤ D ≤ 0.8mm.

[0026] In some embodiments, in the thickness direction, the ratio between the depth H of the groove and the thickness D of the wall satisfies 1 / 12≤H / D≤4 / 3.

[0027] In the above technical solution, by setting the H / D ratio within the above range, the strengthening effect of the reinforcing structure on the structural strength of the wall can be better improved.

[0028] In some embodiments, 0.1mm≤H≤0.4mm, 0.3mm≤D≤1.2mm.

[0029] In some embodiments, 3 / 16 ≤ H / D ≤ 3 / 4. This configuration further enhances the structural strength of the wall.

[0030] In some embodiments, 0.15mm≤H≤0.3mm, 0.4mm≤D≤0.8mm.

[0031] In some embodiments, the reinforcing structure and the wall are an integral structure.

[0032] In the above technical solution, strengthening the integral molding of the structure and wall is beneficial to improving processing efficiency and also to the connection strength between the two.

[0033] In some embodiments, the orthographic projection of the reinforcing structure in the same projection plane perpendicular to the thickness direction of the wall is any one of a straight line, an arc, or a polygonal line. This arrangement improves the flexibility of using individual battery cells.

[0034] In some embodiments, the wall portion has a first surface and a second surface facing opposite directions along its thickness direction. The first surface is disposed facing the electrode assembly. The electrode lead-out hole includes a groove and a through hole that are interconnected. Along the thickness direction, the second surface is recessed towards the first surface to form a groove. The through hole passes through the bottom surface of the groove and the first surface. The electrode terminal is connected to the bottom surface of the groove and the first surface.

[0035] In the above technical solution, the electrode terminals extend into the outer shell sequentially through the groove and through the hole, and are connected to the bottom surface of the groove and the first surface of the wall, which can avoid interference between the electrode terminals and the reinforcing structure.

[0036] In some embodiments, the housing includes a casing and an end cap, the casing having an opening, the end cap closing onto the opening, and a wall formed in either the end cap or the casing. This arrangement improves the flexibility of using the battery cell.

[0037] In some embodiments, the battery cell further includes a pressure relief mechanism disposed in either the end cap or the housing, and configured to release the internal pressure of the battery cell.

[0038] In the above technical solution, the electrode lead-out hole and the pressure relief mechanism are set separately, which is a reasonable layout.

[0039] In some embodiments, the electrode terminals have injection holes.

[0040] In the above technical solution, placing the injection hole on the electrode terminal can reduce the impact on the structural strength of the outer casing.

[0041] In some embodiments, the battery cell is a cylindrical battery cell.

[0042] Secondly, this application provides a battery device including a plurality of battery cells provided according to any embodiment of the first aspect.

[0043] Thirdly, this application provides an electrical device including a plurality of battery cells provided according to any embodiment of the first aspect or a battery device provided according to any embodiment of the second aspect, wherein the battery cells or battery devices are used to store or provide electrical energy.

[0044] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0046] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0047] Figure 2 This application provides an exploded structural diagram of a battery device according to some embodiments.

[0048] Figure 3 This application provides an exploded structural diagram of a single battery cell for some embodiments.

[0049] Figure 4 A schematic diagram of a partial explosion structure of a battery cell provided for some embodiments of this application;

[0050] Figure 5 A top view of the casing of a battery cell provided for some embodiments of this application;

[0051] Figure 6 A top view of the casing of a battery cell provided for other embodiments of this application;

[0052] Figure 7 A partial structural cross-sectional view of the casing of a battery cell provided for some embodiments of this application;

[0053] Figure 8 A top view of a single battery cell provided for some embodiments of this application;

[0054] Figure 9 A partial structural cross-sectional view of a battery cell provided for some embodiments of this application;

[0055] Figure 10 for Figure 9 A magnified view of point P in the middle.

[0056] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0057] 1000. Vehicle; 1. Battery unit; 2. Controller; 3. Motor; 4. Battery cell assembly;

[0058] 100. Battery cell; 200. Housing; 210. First housing; 220. Second housing;

[0059] 10. Outer shell; 110. Housing; 1101. Opening; 120. End cap;

[0060] 11. Wall; 111. Electrode lead-out hole; 1111. Tank; 1112. Through hole; 112. First surface; 113. Second surface;

[0061] 20. Electrode assembly; 201. First tab; 202. Second tab; 30. Electrode terminal; 31. Injection port;

[0062] 40. Reinforcing structure; 41. Groove; 401. First end; 402. Second end;

[0063] 51. First insulating component; 52. Second insulating component; 53. Sealing component;

[0064] 61. First sealing component; 62. Second sealing component;

[0065] X, circumferential direction; Y, thickness direction. Detailed Implementation

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] In this application, "multiple" means two or more (including two).

[0073] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied 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 battery device applications, market demand is also constantly increasing.

[0074] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0075] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0076] During normal operation, the battery cells in the relevant technologies generate gas inside the battery cells. This gas exerts a certain pressure on the battery cell casing. Under the action of gas pressure, the area where the electrode lead-out holes are located on the casing is prone to deformation or even rupture, affecting the normal use of the battery cells and causing safety issues.

[0077] To address the aforementioned technical issues, this application provides a battery cell comprising a casing, an electrode assembly, electrode terminals, and reinforcing structures. The casing includes a wall portion with electrode lead-out holes. The electrode assembly is housed within the casing. The electrode terminals are disposed at the electrode lead-out holes and electrically connected to the electrode assembly. Multiple reinforcing structures are disposed on the wall portion and are distributed circumferentially along the electrode lead-out holes.

[0078] By providing multiple reinforcing structures distributed circumferentially along the electrode lead-out holes in the wall, it is beneficial to improve the structural strength of the wall, especially the structural strength of the wall near the electrode lead-out holes, so as to avoid deformation or even rupture in this area when the internal pressure of the battery cell is too high, thereby improving the reliability of the battery cell.

[0079] The technical solutions described in the embodiments of this application are applicable to various battery devices or electrical equipment that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0080] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0081] For example, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a vehicle 1000 according to one embodiment of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 can internally house a motor 3, a controller 2, and a battery device 1. The controller 2 controls the battery device 1 to supply power to the motor 3. For example, the battery device 1 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 1 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery device 1 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 1000.

[0082] Please see Figure 2 The battery device 1 mentioned in the embodiments of this application may include one or more battery cell assemblies 4 for providing voltage and capacity. The battery cell assembly 4 may include multiple battery cells 100, which are connected in series, parallel or mixed connection through a busbar.

[0083] In some embodiments, the battery cell assembly 4 is typically formed by arranging a plurality of battery cells 100.

[0084] In some embodiments, the battery device 1 may be a battery pack, which includes a housing 200 and one or more battery cell assemblies 4, the battery cell assemblies 4 being housed in the housing 200.

[0085] As an example, the battery cell assembly 4 can be a battery module, and the battery cell assembly 4 can be housed in the housing 200 by fixing the battery module in the housing 200.

[0086] As an example, the battery cell assembly 4 can also be housed in the housing 200 by directly fixing multiple battery cells 100 to the housing 200.

[0087] As an example, the housing 200 may include a first housing 210 and a second housing 220. The first housing 210 and the second housing 220 are fastened together to form a receiving cavity, thereby creating a closed space inside the housing 200 to house the battery cell assembly 4. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first housing 210 may be a top cover or a bottom plate.

[0088] As an example, the housing 200 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 200 forms an enclosed space to accommodate the battery cell assembly 4.

[0089] In some embodiments, the housing 200 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 200 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 200 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0090] The box 200 can be a simple three-dimensional structure such as a cuboid or a cylinder, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids or cylinders. The embodiments of this application do not limit this.

[0091] Specifically, the housing 200 can be a metal shell made of alloy steel, alloy aluminum, etc., or a composite material shell made of metal and polypropylene, etc.

[0092] As an example, the battery cell assembly 4 can be a battery module, which is formed by arranging and fixing multiple battery cells 100 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 100 together with cable ties.

[0093] As an example, the battery cell 100 can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0094] Please see Figure 3 The battery cell 100 includes a housing 10, an electrode assembly 20, and an electrode terminal 30.

[0095] The outer casing 10 is a component used to form the internal environment of the battery cell 100. The internal environment formed by the casing can be used to house the electrode assembly 20, as well as the electrolyte and other components. Optionally, the outer casing 10 can be, but is not limited to, made of metallic or non-metallic materials. For example, metallic materials can be copper, aluminum, or stainless steel; non-metallic materials can be polyethylene, polypropylene, or polyvinyl chloride.

[0096] For example, the outer shell 10 can be a steel shell, an aluminum shell, a plastic shell (such as a polypropylene shell), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0097] The shape of the outer shell 10 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cuboid structure, a cuboid outer shell can be selected; if the electrode assembly 20 is a cylindrical structure, a cylindrical outer shell can be selected.

[0098] The shape of the outer shell 10 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cuboid structure, a cuboid outer shell can be selected; if the electrode assembly 20 is a cylindrical structure, a cylindrical outer shell can be selected.

[0099] Electrode assembly 20 is a component in the battery cell 100 where an electrochemical reaction occurs, and the housing 10 may contain one or more electrode assemblies 20.

[0100] In some embodiments, the electrode assembly 20 may be cylindrical, flat, or polygonal in shape.

[0101] The electrode assembly 20 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0102] The electrode assembly 20 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets with active material constitute the main body of the electrode assembly 20, while the portions of the positive and negative electrode sheets without active material each constitute a tab.

[0103] The electrode includes a first electrode 201 and a second electrode 202, which may be located together at one end of the main body or at both ends of the main body. One of the first electrode 201 and the second electrode 202 is a positive electrode, and the other is a negative electrode.

[0104] In some embodiments, the housing 10 is provided with at least one electrode terminal 30, which is electrically connected to the tab of the electrode assembly 20. The electrode terminal 30 can be directly connected to the tab or indirectly connected to the tab through a current collector, for outputting or inputting electrical energy to the battery cell 100.

[0105] During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte. The electrode terminal 30 can be electrically connected to the electrode assembly 20 by connecting to the tab. The tab electrically connected to the electrode terminal 30 can be either a positive or negative tab.

[0106] Please refer to the following: Figures 2 to 6 According to an embodiment of this application, a battery cell 100 is provided, including a housing 10, an electrode assembly 20, electrode terminals 30, and a reinforcing structure 40. The housing 10 includes a wall portion 11, which has an electrode lead-out hole 111. The electrode assembly 20 is housed within the housing 10. The electrode terminals 30 are disposed in the electrode lead-out hole 111 and electrically connected to the electrode assembly 20. The reinforcing structure 40 is disposed in the wall portion 11, and there are multiple reinforcing structures 40 distributed along the circumferential direction X of the electrode lead-out hole 111.

[0107] The electrode terminal 30 can extend into the interior of the housing 10 through the electrode lead-out hole 111 opened on the wall portion 11 to be electrically connected to the electrode assembly 20. The reinforcing structure 40 is used to enhance the structural strength of the wall portion 11 to improve the wall portion 11's resistance to deformation under the internal pressure of the battery cell 100.

[0108] "Circumferential X of electrode lead-out hole 111" can be understood as a closed path surrounding the outer periphery of electrode lead-out hole 111. For example, if electrode lead-out hole 111 is a circular structure, the multiple reinforcing structures 40 can form a ring structure with one end facing the electrode lead-out hole 111. If electrode lead-out hole 111 is a square structure, the multiple reinforcing structures 40 can form a polygonal structure with one end facing the electrode lead-out hole 111.

[0109] The number of reinforcing structures 40 can be, but is not limited to, two, three, four, five, six, or more.

[0110] In related technologies, battery cells have holes in their walls to accommodate electrode terminals. This results in low strength at the connection point between the electrode terminals and the wall. This connection point is prone to deformation or even rupture under the impact of gas inside the battery cell, allowing gas to escape from this location and potentially causing safety issues.

[0111] Unlike other applications, in this embodiment, by providing multiple reinforcing structures 40 distributed circumferentially along the electrode lead-out holes 111 in the wall portion 11, it is beneficial to improve the structural strength of the wall portion 11, especially to improve the structural strength of the wall portion 11 near the electrode lead-out holes 111, so as to avoid deformation or even cracking in this area when the internal pressure of the battery cell 100 is too high, thereby improving the reliability of the battery cell 100.

[0112] Furthermore, by setting multiple reinforcing structures 40, each reinforcing structure 40 can strengthen the wall portion 11, thereby strengthening the wall portion 11 in the circumferential X position near the electrode lead-out hole 111. This also facilitates processing and positioning, further improving the structural strength of the wall portion 11, which in turn helps to further improve the reliability of the battery cell 100.

[0113] In some alternative embodiments, a plurality of reinforcing structures 40 are spaced apart circumferentially along the electrode lead-out hole 111.

[0114] This configuration facilitates the processing and positioning of the reinforcing structure 40 on the wall portion 11, and also avoids interference between adjacent reinforcing structures 40. This helps to improve the uniformity of the reinforcing structure 40 in strengthening the wall portion 11, thereby better enhancing the structural strength of the wall portion 11.

[0115] Optionally, multiple reinforcing structures 40 are distributed at equal intervals along the circumferential direction X.

[0116] For example, such as Figure 5 and Figure 6 As shown, the wall portion 11 may be provided with six reinforcing structures 40, which are distributed at equal intervals along the circumferential direction X.

[0117] The reinforcing structure 40 can be configured in various shapes. For example, the reinforcing structure 40 can be configured as a straight strip structure, an arc structure, or a broken line structure.

[0118] The shapes of the multiple reinforcing structures 40 can be the same or different. For example, some of the multiple reinforcing structures 40 can be straight, while others can be arc-shaped. As another example, all of the multiple reinforcing structures 40 can be straight.

[0119] Optionally, the area of ​​each reinforcing structure 40 can be set to be the same or different.

[0120] In some embodiments, the battery cell 100 further includes a pressure relief structure disposed on the housing 10 and spaced apart from the electrode terminals 30, the pressure relief structure being configured to release the internal pressure of the battery cell 100.

[0121] In this embodiment, since the structural strength of the wall portion 11 with electrode lead-out holes 111 is enhanced, when the internal pressure of the battery cell 100 reaches the threshold, the wall portion 11 near the electrode lead-out holes 111 will not be impacted, deformed, or broken, thereby ensuring the normal opening of the pressure relief structure and allowing the internal pressure of the battery cell 100 to be released by the pressure relief mechanism.

[0122] In some embodiments, the pressure relief structure may be provided on the wall portion 11, and the reinforcing structure 40 may be separated from the pressure relief mechanism.

[0123] Optionally, the reinforcing structure 40 can be integrally formed with the wall portion 11; of course, the reinforcing structure 40 can also be provided separately from the wall portion 11. The reinforcing structure 40 can be directly connected to the wall portion 11, or it can be connected to the wall portion 11 through other components. Exemplary methods for connecting the reinforcing structure 40 to the wall portion 11 can be, but are not limited to, bolting, riveting, bonding, or snap-fitting.

[0124] Optionally, the reinforcing structure 40 can be a groove structure formed by recessing the wall portion 11 on any side along the thickness direction Y, and the strength of the wall portion 11 corresponding to the groove structure along the thickness direction Y is greater than the strength of the wall portion 11 at other locations.

[0125] Optionally, the reinforcing structure 40 can also be configured as a protruding structure that protrudes from at least one side of the wall portion 11 along the thickness direction Y, thereby improving the deformation resistance of the wall portion 11 by locally thickening it.

[0126] The shape of the electrode lead-out hole 111 can be any of the following, including but not limited to: circle, polygon, ellipse, etc.

[0127] For example, the electrode lead-out hole 111 is circular in shape, which can effectively avoid stress concentration caused by sharp corners or edges during processing. In addition, the circular contour can also uniformly transmit the load when under pressure, which can effectively reduce local deformation and improve the structural stability of the wall 11.

[0128] Please see Figure 5 and Figure 6 In some alternative embodiments, at least one reinforcing structure 40 intersects the edge of the electrode lead-out hole 111.

[0129] "The reinforcing structure 40 intersects with the edge of the electrode lead-out hole 111" means that the reinforcing structure 40 and the electrode lead-out hole 111 are not spaced apart, but connected. "The edge of the electrode lead-out hole 111" refers to the position where the electrode lead-out hole 111 is provided on the wall portion 11. This arrangement helps to improve the structural strength of the wall portion 11 near the electrode lead-out hole 111 after the electrode lead-out hole 111 is provided on the wall portion 11.

[0130] The battery cell 100 provided in some embodiments of this application has a reinforcing structure 40 on the wall 11 that intersects with the edge of the electrode lead-out hole 111. This helps to improve the structural strength of the wall 11, especially the strength of the area near the electrode lead-out hole 111, so as to avoid deformation or even cracking in this area when the internal pressure of the battery cell 100 is too high, thereby improving the reliability of the battery cell 100.

[0131] At least one of the multiple reinforcing structures 40 intersects the edge of the electrode lead-out hole 111. Optionally, a portion of the reinforcing structures 40 intersect the edge of the electrode lead-out hole 111, while another portion of the reinforcing structures 40 are spaced apart from the electrode lead-out hole 111. Optionally, all the reinforcing structures 40 intersect the edge of the electrode lead-out hole 111.

[0132] Please continue reading. Figure 5 and Figure 6 In some alternative embodiments, the reinforcing structure 40 has a first end 401 and a second end 402, which are closer to the electrode lead-out hole than to each other. In two adjacent reinforcing structures 40, the minimum distance between the first end 401 of one reinforcing structure 40 and the first end 401 of the other reinforcing structure 40 is less than the minimum distance between the second end 402 of one reinforcing structure 40 and the second end 402 of the other reinforcing structure 40.

[0133] By setting it in the above manner, multiple reinforcing structures 40 can form a high-density support in the area where the electrode lead-out hole 111 connects with the wall portion 11. The multiple reinforcing structures 40 can be radially distributed around the electrode lead-out hole 111, which can better reduce the risk of deformation of the wall portion 11 in the area close to the electrode lead-out hole 111, improve the structural strength of the wall portion 11 around the electrode lead-out hole 111, and help to better improve the structural stability of the wall portion 11, thereby better improving the reliability of the battery cell 100.

[0134] For example, such as Figure 5 As shown, the orthographic projection of the electrode lead-out hole 111 in the thickness direction Y of the wall portion 11 is a circular structure. The reinforcing structure 40 extends radially along the electrode lead-out hole 111 and has a first end 401 and a second end 402 arranged radially opposite to each other along the electrode lead-out hole 111. The first end 401 is arranged close to the electrode lead-out hole 111 relative to the second end 402, and the first end 401 intersects with the edge of the electrode lead-out hole 111.

[0135] Pointing from the first end 401 to the second end 402 of the reinforcing structure 40, the reinforcing structure 40 can have the same or different dimensions in the circumferential direction X. That is, the width of the reinforcing structure 40 can be the same or different.

[0136] like Figure 5 and Figure 6 As shown, in some alternative embodiments, the second end 402 of the reinforcing structure 40 is spaced apart from the edge of the wall portion 11.

[0137] The second end 402 of the reinforcing structure 40 does not extend to the edge of the wall 11; there is a certain distance between it and the edge of the wall 11. It should be noted that the edge of the wall 11 in the battery cell 100 is usually designed with rounded corners. This not only reduces stress concentration and improves structural stability but also enhances aesthetics. Therefore, the edge of the wall 11 is usually bent to form a corner, such as... Figures 4 to 6 As shown, this edge can be the intersection point where the wall 11 connects to the outer casing 10 or the housing 110.

[0138] Therefore, by setting it in the above manner, interference between the reinforcing structure 40 and the edge of the wall 11 can be avoided, which facilitates the processing and forming of the wall 11.

[0139] like Figure 5 As shown, in some embodiments, the minimum distance between the second end 402 and the edge of the wall portion 11 is R, where 4mm≤R≤11mm.

[0140] As an example, the value of R can be, but is not limited to, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, etc.

[0141] If the minimum spacing is designed to be too small, i.e. less than 4 mm, there is a possibility that the second end 402 of the reinforcing structure 40 may interfere with the edge of the wall 11 during the processing and forming process. If the minimum spacing is designed to be too large, i.e. greater than 11 mm, the extension length of the reinforcing structure 40 will be shorter, thereby weakening the reinforcing effect of the reinforcing structure 40 on the structural strength of the wall 11.

[0142] Therefore, by setting the minimum distance R between the second end 402 and the edge of the wall portion 11 between 4mm and 11mm, including the two endpoint values ​​of 4mm and 11mm, it is possible to meet the processing requirements of the wall portion 11 and ensure the strengthening effect of the reinforcing structure 40 on the structural strength of the wall portion 11.

[0143] Furthermore, in some alternative embodiments, 6mm ≤ R ≤ 8mm.

[0144] By further setting the minimum distance R between the second end 402 and the edge of the wall portion 11 to between 6mm and 8mm, including two endpoint values ​​of 6mm and 8mm, it is possible to better balance the processing and fabrication of the wall portion 11 and the strengthening effect on the structural strength of the wall portion 11.

[0145] Please refer to the following: Figures 5 to 9 , Figure 7 This can be understood as a partial sectional view of the wall portion 11 having a straight reinforcing structure 40, that is, Figure 7 It can be Figure 5 A partial sectional view of the structure shown. Figure 9 This can be understood as a partial cross-sectional view showing that the wall 11 of the outer shell 10 is provided with an arc-shaped reinforcing structure 40, that is, Figure 9 It can be Figure 8 A partial sectional view of the structure shown.

[0146] In some alternative embodiments, the wall portion 11 has a first surface 112 facing or away from the electrode assembly 20 along its own thickness direction Y, and the reinforcing structure 40 protrudes from the first surface 112.

[0147] By setting the reinforcing structure 40 to protrude from the first surface 112 along the thickness direction Y, it helps to enhance the deformation resistance of the wall portion 11, ensuring the structural reliability of the wall portion 11, thereby improving the reliability of the battery cell 100.

[0148] Optionally, the first surface 112 may face the electrode assembly 20 or be disposed away from the electrode assembly 20.

[0149] In some embodiments, the wall portion 11 further has a second surface 113 opposite to the first surface 112, the wall portion 11 is provided with a groove 41, the groove 41 is recessed from the second surface 113 toward the first surface 112, and a reinforcing structure 40 protruding from the first surface 112 is formed at the position corresponding to the groove 41 on the wall portion 11.

[0150] The first surface 112 and the second surface 113 are arranged opposite each other along the thickness direction Y. The second surface 113 is provided with a recessed groove 41, and the first surface 112 is provided with a protruding reinforcing structure 40. The reinforcing structure 40 and the groove 41 are arranged opposite each other along the thickness direction Y. That is, in the same projection image perpendicular to the thickness direction Y, the orthographic projection of the reinforcing structure 40 and the orthographic projection of the groove 41 overlap.

[0151] With the above configuration, when the wall portion 11 is subjected to internal pressure from the battery cell 100, the combination of the groove 42 and the reinforcing structure 40 can help enhance the deformation resistance of the wall portion 11, thereby ensuring the structural reliability of the wall portion 11.

[0152] Optionally, the groove 41 may be connected to the electrode lead-out hole 111, or the groove 41 may be spaced apart from the electrode lead-out hole 111.

[0153] Optionally, the intersection of the groove 41 and the wall portion 11 can be rounded, and / or the intersection of the reinforcing structure 40 and the wall portion 11 can be rounded.

[0154] Optionally, the reinforcing structure 40 and the groove 41 can be integrally formed by stamping or extruding the wall portion 11 along the thickness direction Y.

[0155] In some embodiments, the first surface 112 is the surface of the wall portion 11 facing the electrode assembly 20, and the second surface 113 is the surface of the wall portion 11 facing away from the electrode assembly 20.

[0156] In other words, the reinforcing structure 40 is closer to the electrode assembly 20 than the groove 41. It can be understood that the gas generated inside the battery cell 100 will exert a force on the wall 11 in the direction from the inside of the battery cell 100 to the outside of the battery cell 100. By placing the reinforcing structure 40 on the side of the wall 11 facing the electrode assembly 20, the electrode assembly 20 has a better resistance to this force, which can further improve the deformation resistance of the wall 11 against the internal pressure of the battery cell 100, thereby better improving the structural stability of the wall 11 and thus better improving the reliability of the battery cell 100.

[0157] Furthermore, the electrode assembly 20 is positioned towards the interior of the housing 10, which reduces the space occupied by the housing 10 to the outside, thus helping to reduce the space occupied by the battery cell 100. In addition, due to... Figure 10 As shown, this arrangement can also make full use of the space between the wall 11 and the portion of the electrode terminal 30 that extends into the housing 10, which helps to improve the structural compactness of the battery cell 100.

[0158] In other embodiments, the second surface 113 is the surface of the wall portion 11 facing the electrode assembly 20, and the first surface 112 is the surface of the wall portion 11 facing away from the electrode assembly 20.

[0159] Optionally, please refer to Figure 10 To ensure the insulation between the electrode terminal 30 and the wall portion 11, the battery cell 100 also includes a first insulating member 51 and a second insulating member 52. The electrode terminal 30 is insulated from the wall portion 11 through the first insulating member 51 and the second insulating member 52.

[0160] In some embodiments, the second insulating member 52 is disposed within the housing 10, and at least a portion of the second insulating member 52 has a gap with the wall portion 11 in the thickness direction Y. The reinforcing structure 40 can be accommodated in this gap without occupying additional space, which is beneficial to improving the space utilization of the battery cell 100.

[0161] Optionally, the second insulating member 52 has a clearance space on the side facing the wall portion 11 along the thickness direction Y. The reinforcing structure 40 can also be accommodated in the clearance space without taking up additional space, and can make the structural design of the battery cell 100 more compact.

[0162] Please see Figure 7 In some alternative embodiments, the ratio between the distance L between the top end of the reinforcing structure 40 and the bottom end of the groove 41 in the thickness direction Y, and the thickness D of the wall portion 11, satisfies: 0.5≤L / D≤1.

[0163] The top of the reinforcing structure 40 refers to the end of the reinforcing structure 40 that is away from the first surface 112 in the thickness direction Y.

[0164] Optionally, the top surface of the reinforcing structure 40 is parallel to the bottom surface of the groove 41, and the distance between the top surface of the reinforcing structure 40 and the bottom surface of the groove 41 along the thickness direction Y is L.

[0165] As an example, the L / D ratio can be, but is not limited to, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc.

[0166] The L / D ratio can be used to define the ratio between the thickness of the area after the reinforcing structure 40 and the groove 41 are provided on the wall portion 11, and the original thickness of the wall portion 11. The maximum value of L / D is 1, meaning that the thickness of the wall portion 11 after the reinforcing structure 40 and the groove 41 are provided can be the same as the original thickness of the wall portion 11, but cannot be greater than the original thickness of the wall portion 11. The minimum value of L / D is 0.5, meaning that the thickness of the wall portion 11 after the reinforcing structure 40 and the groove 41 are provided can be less than the original thickness of the wall portion 11, but cannot be less than 1 / 2 of the original thickness of the wall portion 11.

[0167] If the L / D ratio is set too small, i.e. less than 0.5, the thickness of the reinforcing structure 40 will be too small compared to the thickness of the wall portion 11, thus weakening the reinforcing effect of the reinforcing structure 40 on the structural strength of the wall portion 11. If the L / D ratio is set too large, i.e. greater than 1, it will increase the amount of material used, thereby increasing costs and weight.

[0168] Therefore, by setting the L / D ratio between 0.5 and 1, including the two endpoint values ​​of 0.5 and 1, it is possible to ensure that the reinforcing structure 40 can enhance the structural strength of the wall 11 while also reducing the impact on cost.

[0169] In some embodiments, 0.15mm≤L≤1.2mm, 0.3mm≤D≤1.2mm.

[0170] By setting the value of L between 0.15mm and 1.2mm, including the two endpoint values ​​of 0.15mm and 1.2mm, and by setting the value of L between 0.3mm and 1.2mm, including the two endpoint values ​​of 0.3mm and 1.2mm, the wall portion 11 can have a suitable thickness after the reinforcement structure 40 is provided.

[0171] Furthermore, in some alternative embodiments, 0.7 ≤ L / D < 1.

[0172] By further setting the L / D value between 0.7 and 1, including the two endpoint values ​​of 0.7 and 1, the structural strength of the wall 11 can be further improved, thereby better improving the reliability of the battery cell 100.

[0173] In some embodiments, 0.28mm ≤ L < 0.8mm, 0.4mm ≤ D ≤ 0.8mm.

[0174] Optionally, 0.8 ≤ L / D ≤ ​​1.

[0175] Optionally, 0.9 ≤ L / D ≤ ​​1.

[0176] Optionally, L / D = 1.

[0177] Please continue reading. Figure 7 In some alternative embodiments, the ratio between the depth H of the groove 41 and the thickness D of the wall 11 in the thickness direction Y satisfies 1 / 12 ≤ H / D ≤ 4 / 3.

[0178] As an example, the H / D ratio can be, but is not limited to, 1 / 12, 1 / 6, 1 / 4, 5 / 12, 1 / 2, 7 / 12, 2 / 3, 3 / 4, 5 / 6, 11 / 12, 1, 4 / 3, etc.

[0179] The H / D ratio can be used to define the ratio between the depth of the groove 41 after it is provided on the wall portion 11 and the original thickness of the wall portion 11. The maximum value of H / D is 4 / 3, meaning that the depth of the groove 41 can be greater than the original thickness of the wall portion 11, but cannot exceed 4 / 3 of the original thickness of the wall portion 11. The minimum value of H / D is 1 / 12, meaning that the depth of the groove 41 can be less than the original thickness of the wall portion 11, but cannot be less than 1 / 12 of the original thickness of the wall portion 11.

[0180] If the H / D ratio is set too small, i.e. less than 1 / 12, the size of the first surface 112 of the reinforcing structure 40 protruding from the wall portion 11 along the thickness direction Y will be reduced, weakening the reinforcing effect of the reinforcing structure 40 on the structural strength of the wall portion 11. Conversely, if the H / D ratio is set too large, i.e. greater than 4 / 3, it is likely to lead to a larger deformation of the wall portion 11, resulting in greater stress, which will also have an adverse effect on the strength of the wall portion 11.

[0181] Therefore, by setting the H / D ratio between 1 / 12 and 4 / 3, including the two endpoint values ​​of 1 / 12 and 4 / 3, the deformation resistance of the wall 11 can be improved, thereby improving the reliability of the battery cell 100.

[0182] In some embodiments, 0.1mm≤H≤0.4mm, 0.3mm≤D≤1.2mm.

[0183] By setting the value of H between 0.1mm and 0.4mm, including the two endpoint values ​​of 0.1mm and 0.4mm, and by setting the value of D between 0.3mm and 1.2mm, including the two endpoint values ​​of 0.3mm and 1.2mm, it is easier to process and manufacture.

[0184] In some alternative embodiments, 3 / 16 ≤ H / D ≤ 3 / 4.

[0185] By further setting the H / D value between 3 / 16 and 3 / 4, including the two endpoint values ​​of 3 / 16 and 3 / 4, the structural strength of the wall 11 can be further improved, thereby better improving the reliability of the battery cell 100.

[0186] In some embodiments, 0.15mm≤H≤0.3mm, 0.4mm≤D≤0.8mm.

[0187] In some alternative embodiments, the reinforcing structure 40 and the wall portion 11 are an integral structure.

[0188] The battery cell 100 provided in some embodiments of this application is configured in this way so that the reinforcing structure 40 and the wall portion 11 do not need to be connected by an additional connection process. This simplifies the process flow, improves processing efficiency, and also improves the connection strength between the reinforcing structure 40 and the wall portion 11, thereby improving the structural strength of the wall portion 11 with the reinforcing structure 40.

[0189] The reinforcing structure 40 can be made from the wall 11 by stretching or extrusion molding without adding new components and without affecting the weight of the battery cell 100.

[0190] In some alternative embodiments, the orthographic projection of the reinforcing structure 40 in the same projection plane perpendicular to the thickness direction Y of the wall portion 11 is any one of a straight line, an arc, or a polygonal line.

[0191] like Figure 5 As shown, the orthographic projection of the reinforcing structure 40 onto the same projection plane perpendicular to the thickness direction Y is a linear structure.

[0192] For example, when the electrode lead-out hole 111 is a circular structure, the reinforcing structure 40 can be a straight structure extending radially along the electrode lead-out hole 111.

[0193] like Figure 6 As shown, the orthographic projection of the reinforcing structure 40 in the same projection plane perpendicular to the thickness direction Y is an arc-shaped structure, pointing from the first end 401 of the reinforcing structure 40 to the second end 402. The reinforcing structure 40 has an arc-shaped protrusion that protrudes along the circumferential direction X.

[0194] The orthographic projection of the reinforcing structure 40 onto the same projection plane perpendicular to the thickness direction Y is a polygonal structure. The polygonal shape can be understood as the reinforcing structure 40 being composed of straight structures extending in different directions.

[0195] The shape of the reinforcing structure 40 in the battery cell 100 provided in some embodiments of this application can be set to any of the above structures, which is beneficial to improving the processing flexibility of the battery cell 100.

[0196] Please see Figures 5 to 10 In some alternative embodiments, the wall portion 11 has a first surface 112 and a second surface 113 facing opposite directions along its own thickness direction Y. The first surface 112 is disposed facing the electrode assembly 20. The electrode lead-out hole 111 includes a groove 1111 and a through hole 1112 that are interconnected. Along the thickness direction Y, the second surface 113 is recessed towards the first surface 112 to form the groove 1111. The through hole 1112 passes through the bottom surface of the groove 1111 and the first surface 112. The electrode terminal 30 is connected to the bottom surface of the groove 1111 and the first surface 112.

[0197] The electrode lead-out hole 111 can be configured as a stepped hole, so that the electrode terminal 30 extends into the outer shell 10 through the groove 1111 and the through hole 1112 in sequence. The electrode terminal 30 can be insulatedly connected to the bottom surface of the groove 1111 through the first insulating member 51, and insulatedly connected to the second surface 113 of the wall portion 11 through the second insulating member 52.

[0198] Furthermore, by connecting the electrode terminal 30 to the bottom surface of the tank 1111, the size of the electrode terminal 30 protruding from the wall 11 in the thickness direction Y can be reduced, thereby reducing the overall size of the battery cell 100 in the thickness direction Y, which is beneficial to reducing the space occupied by the battery cell 100.

[0199] Optionally, the reinforcing structure 40 intersects with the edge of the tank 1111. This arrangement helps to avoid interference between the electrode terminal 30 and the reinforcing structure 40, and the reasonable layout helps to ensure the structural stability of the wall 11.

[0200] Optionally, when the wall portion 11 is provided with a groove 41 that is opposite to the reinforcing structure 40 along the thickness direction Y, the groove 41 is connected to the groove body 1111.

[0201] Optionally, the depth H of the groove 41 in the thickness direction Y can be set to the same as the depth of the groove 1111. Of course, the depth H of the groove 41 in the thickness direction Y can also be different from the depth of the groove 1111.

[0202] like Figure 10 As shown, optionally, the battery cell 100 also includes a sealing member 53, which is disposed between the electrode terminal 30 and the wall portion 11 along the thickness direction Y, so as to prevent external impurities and other particles from entering the interior of the housing 10 through the gap between the electrode terminal 30 and the wall portion 11, and also to prevent the electrolyte inside the housing 10 from leaking out, thereby improving the reliability of the battery cell 100.

[0203] Please see Figure 3 and Figure 4 In some alternative embodiments, the housing 10 includes a housing 110 and an end cap 120, the housing 110 having an opening 1101, the end cap 120 closing the opening 1101, and a wall 11 formed in either the end cap 120 or the housing 110.

[0204] The housing 110 may have one or more openings 1101. The end cap 120 may also have one or more. The wall portion 11 may be formed in the housing 110 or in the end cap 120.

[0205] The above-mentioned configuration helps to improve the flexibility of the use of the battery cell 100.

[0206] For example, the housing 110 is a hollow cylindrical structure open at one end. The open end of the housing 110 forms an opening 1101, and an end cap 120 covers the opening 1101. The side of the housing 110 facing away from the opening 1101 along its height direction is a wall 11, and the height direction of the housing 110 can be understood as the thickness direction Y of the wall 11. The electrode assembly 20 has a first tab 201 along the thickness direction Y facing the wall 11. The electrode terminal 30 is used to electrically connect to the first tab 201 to form one output electrode of the battery cell 100. The electrode assembly 20 has a second tab 202 along the thickness direction Y facing the wall 11. The end cap 120 is used to electrically connect to the second tab 202 to form the other output electrode of the battery cell 100.

[0207] The output terminal is the part that connects the battery cell 100 to other components and outputs the electrical energy of the battery cell 100. The battery cell 100 may include a positive output terminal and a negative output terminal. Understandably, if the first electrode 201 is a positive electrode, then the second electrode 202 is a negative electrode, and if the first electrode 201 is a negative electrode, then the second electrode 202 is a positive electrode.

[0208] Optionally, the housing 110 is an integral structure, and the wall portion 11 is formed in the housing 110. In the thickness direction Y, the wall portion 11 is disposed opposite to the end cap 120 and spaced apart.

[0209] In some alternative embodiments, the battery cell 100 also includes a pressure relief mechanism disposed on either the end cap 120 and the housing 110 and configured to release internal pressure of the battery cell 100.

[0210] The pressure relief mechanism is used to release internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. The pressure relief mechanism can be detachably connected to the housing 10, either directly connected to the housing 10 or integrally mounted on the housing 10. The pressure relief mechanism can also be secured to the housing 10 by other components. As an example, the connection method between the pressure relief mechanism and the housing 10 can be, but is not limited to, bolting, riveting, bonding, or snap-fitting.

[0211] The pressure relief mechanism is used to release internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. For example, when the internal pressure or temperature of the battery cell 100 reaches the threshold, the pressure relief mechanism can form a pressure relief port on the wall 11, allowing the interior of the outer casing 10 to communicate with the outside, thereby discharging the internal substances (liquid or gas) of the battery cell 100, releasing pressure, and reducing the risk of the battery cell 100 exploding.

[0212] Optionally, the pressure relief mechanism may include, but is not limited to, explosion-proof valves, air valves, pressure relief valves, safety valves, and other structures.

[0213] In some embodiments, a pressure relief mechanism is disposed on the end cap 120, and a wall portion 11 with an electrode lead-out hole 111 is formed in the housing 110.

[0214] In other embodiments, a pressure relief mechanism is disposed in the housing 110, and a wall portion 11 with an electrode lead-out hole 111 is formed in the end cap 120.

[0215] The battery cell 100 provided in some embodiments of this application has a reasonable layout by separating the pressure relief mechanism and the electrode lead-out hole 111, which can make full use of the assembly space of the housing 10. In addition, since a reinforcing structure 40 is added to increase the structural strength of the wall 11, when the internal pressure or temperature of the battery cell 100 reaches a threshold, the internal pressure of the battery cell 100 is smoothly discharged to the outside through the pressure relief mechanism, instead of being rushed out through the wall 11.

[0216] like Figure 4 As shown, in some alternative embodiments, electrode terminal 30 has a liquid injection hole 31.

[0217] The electrolyte injection hole 31 is used to introduce electrolyte from the outside of the battery cell 100 into the inside of the battery cell 100.

[0218] The battery cell 100 provided in some embodiments of this application can reduce the number of holes on the housing 10 by providing the liquid injection hole 31 on the electrode terminal 30, thereby reducing the impact on the strength of the housing 10.

[0219] Optionally, the electrode lead-out hole 111 can be coaxially arranged with the center hole of the electrode assembly 20.

[0220] Optionally, the injection hole 31 can be coaxially arranged with the electrode lead-out hole 111. Optionally, the injection hole 31, the electrode lead-out hole 111, and the center hole of the electrode assembly 20 are coaxially arranged.

[0221] Please see Figure 3 and Figure 4 In some embodiments, the battery cell 100 may further include a first sealing member 61, which is used to seal the electrode lead-out hole 111 to ensure the sealing requirements of the battery cell 100 and to prevent external particles and other impurities from entering the interior of the battery cell 100 through the electrode lead-out hole 111.

[0222] Please see Figure 3 and Figure 4 In some embodiments, the battery cell 100 may further include a second sealing member 62, which is used to seal the electrolyte injection hole 31. After electrolyte is injected into the battery cell 100, the electrolyte injection hole 31 can be sealed by the second sealing member 62 to prevent electrolyte from leaking out of the electrolyte injection hole 31.

[0223] Depend on Figure 4 As shown, in some optional embodiments, the battery cell 100 is a cylindrical battery cell.

[0224] For example, in some embodiments of this application, the battery cell 100 is a cylindrical battery cell, and the outer shell 10 included in the battery cell 100 is a cylindrical outer shell. The outer shell 10 includes a housing 110 having an opening 1101 on one side along the thickness direction Y. The outer shell 10 also includes an end cap 120 covering the opening 1101. A wall portion 11 is formed at one end of the housing 110 along the thickness direction Y away from the end cap 120.

[0225] According to some embodiments of this application, this application also provides a battery device 1, including a plurality of battery cells 100 provided in any of the above embodiments.

[0226] According to some embodiments of this application, this application also provides an electrical device, including a plurality of battery cells 100 provided in any of the embodiments or a battery device 1 provided in any of the embodiments, wherein the battery cells 100 or the battery device 1 are used to store or provide electrical energy.

[0227] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0228] Please refer to the following: Figures 3 to 10 According to some embodiments of this application, this application provides a cylindrical battery cell 100, including a housing 10, an electrode assembly 20, electrode terminals 30, a reinforcing structure 40, and a pressure relief mechanism.

[0229] The housing 10 includes a housing 110 and an end cap 120. The housing 110 has an opening 1101, and the end cap 120 closes to the opening 1101. A wall 11 is formed in the housing 110, and the wall 11 has an electrode lead-out hole 111. The electrode assembly 20 is housed within the housing 10. Electrode terminals 30 are disposed in the electrode lead-out hole 111 and electrically connected to the electrode assembly 20, and the electrode terminals 30 have a liquid injection hole 31. A pressure relief mechanism is disposed in the end cap 120 and configured to release the internal pressure of the battery cell 100.

[0230] The wall portion 11 has a first surface 112 and a second surface 113 facing opposite directions along its own thickness direction Y. The first surface 112 is disposed facing the electrode assembly 20. The electrode lead-out hole 111 includes a groove 1111 and a through hole 1112 that are interconnected. Along the thickness direction Y, the second surface 113 is recessed towards the first surface 112 to form the groove 1111. The through hole 1112 passes through the bottom surface of the groove 1111 and the first surface 112. The electrode terminal 30 is connected to the bottom surface of the groove 1111 and the first surface 112.

[0231] There are multiple reinforcing structures 40, which are spaced apart circumferentially along the electrode lead-out hole 111, and the reinforcing structures 40 and the wall portion 11 are integral structures. Each reinforcing structure 40 protrudes from the first surface 112. The wall portion 11 is provided with a groove 41, which is recessed from the second surface 113 toward the first surface 112. A reinforcing structure 40 protruding from the first surface 112 is formed at a position corresponding to the groove 41 on the wall portion 11. The groove 41 is connected to the groove body 1111. The reinforcing structure 40 has a first end 401 and a second end 402. The first end 401 is closer to the electrode lead-out hole 111 than the second end 402. In two adjacent reinforcing structures 40, the minimum distance between the first end 401 of one reinforcing structure 40 and the first end 401 of the other reinforcing structure 40 is less than the minimum distance between the second end 402 of one reinforcing structure 40 and the second end 402 of the other reinforcing structure 40. The minimum distance between the second end 402 and the edge of the wall 11 is R, where 4mm ≤ R ≤ 11mm.

[0232] In the thickness direction Y, the ratio between the distance L between the top end of the reinforcing structure 40 and the bottom end of the groove 41 and the thickness D of the wall 11 satisfies: 0.7≤L / D≤1, the ratio between the depth H of the groove 41 and the thickness D of the wall 11 satisfies 3 / 16≤H / D≤3 / 4, 0.28mm≤L<0.8mm, 0.4mm≤D≤0.8mm, and 0.15mm≤H≤0.3mm.

[0233] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0234] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized by, include: The housing includes a wall portion having electrode lead-out holes; Electrode assembly, housed within the housing; Electrode terminals are disposed in the electrode lead-out holes and electrically connected to the electrode assembly; A reinforcing structure is provided on the wall portion, and there are multiple reinforcing structures distributed circumferentially along the electrode lead-out hole.

2. The battery cell of claim 1, wherein, At least one of the reinforcing structures intersects the edge of the electrode lead-out hole.

3. The battery cell of claim 1, wherein, The reinforcing structure has a first end and a second end. The first end is closer to the electrode lead-out hole than the second end. In two adjacent reinforcing structures, the minimum distance between the first end of one reinforcing structure and the first end of the other reinforcing structure is less than the minimum distance between the second end of one reinforcing structure and the second end of the other reinforcing structure.

4. The battery cell of claim 3, wherein, The second end of the reinforcing structure is spaced apart from the edge of the wall portion.

5. The battery cell of claim 4, wherein, The minimum distance between the second end and the edge of the wall is R, where 4mm≤R≤11mm.

6. The battery cell of claim 5, wherein, 6mm≤R≤8mm.

7. The battery cell of any one of claims 1 to 6, wherein, The wall portion has a first surface that faces or faces away from the electrode assembly along its own thickness direction, and the reinforcing structure protrudes from the first surface.

8. The battery cell of claim 7, wherein, The wall portion also has a second surface opposite to the first surface, the wall portion is provided with a groove, the groove is recessed from the second surface toward the first surface, and a reinforcing structure protruding from the first surface is formed at a position on the wall portion corresponding to the groove.

9. The battery cell of claim 8, wherein, The first surface is the surface of the wall portion facing the electrode assembly, and the second surface is the surface of the wall portion facing away from the electrode assembly.

10. The battery cell of claim 8, wherein, In the thickness direction, the ratio between the distance L between the top end of the reinforcing structure and the bottom end of the groove and the thickness D of the wall portion satisfies: 0.5≤L / D≤1.

11. The battery cell of claim 10, wherein, 0.15mm≤L≤1.2mm, 0.3mm≤D≤1.2mm.

12. The battery cell of claim 10, wherein, 0.7≤L / D<1.

13. The battery cell of claim 12, wherein, 0.28mm≤L<0.8mm, 0.4mm≤D≤0.8mm.

14. The battery cell of claim 8, wherein, In the thickness direction, the ratio between the depth H of the groove and the thickness D of the wall portion satisfies 1 / 12≤H / D≤4 / 3.

15. The battery cell of claim 14, wherein, 0.1mm≤H≤0.4mm, 0.3mm≤D≤1.2mm.

16. The battery cell of claim 14, wherein, 3 / 16≤H / D≤3 / 4.

17. The battery cell of claim 16, wherein, 0.15mm≤H≤0.3mm, 0.4mm≤D≤0.8mm.

18. The battery cell of any one of claims 1 to 6, wherein, The reinforcing structure and the wall are an integral structure.

19. The battery cell of any one of claims 1 to 6, wherein, In the same projection plane perpendicular to the thickness direction of the wall, the orthographic projection of the reinforcing structure is any one of a straight line, an arc, or a polygonal line.

20. The battery cell of any one of claims 1 to 6, wherein, The wall portion has a first surface and a second surface facing opposite directions along its thickness direction. The first surface is disposed facing the electrode assembly. The electrode lead-out hole includes a groove and a through hole that are interconnected. Along the thickness direction, the second surface is recessed towards the first surface to form the groove. The through hole passes through the bottom surface of the groove and the first surface. The electrode terminal is connected to the bottom surface of the groove and the first surface.

21. The battery cell of any one of claims 1 to 6, wherein, The housing includes a case having an opening, and an end cap that covers the opening, and the wall portion is formed in either one of the end cap and the case.

22. The battery cell of claim 21, wherein, The battery cell further includes a pressure relief mechanism provided to the other one of the end cap and the case and configured to release internal pressure of the battery cell.

23. The battery cell of any one of claims 1 to 6, wherein, The electrode terminal has a liquid injection hole.

24. The battery cell of any one of claims 1 to 6, wherein, The battery cell is a cylindrical battery cell.

25. A battery device, characterized by A plurality of battery cells according to any one of claims 1 to 24.

26. An electrical device, comprising: A plurality of battery cells according to any one of claims 1 to 24 or a battery device according to claim 25, for storing or providing electric power.

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