Battery monomer, battery device and electric device

Abstract

The utility model relates to the technical field of battery structures, and provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, an electrode assembly and an end cover, and one side, facing the electrode assembly, of the end cover is provided with an insulating part; the insulating part comprises a connecting part and a first boss part, the connecting part is connected to the side wall face, facing the electrode assembly, of the end cover, and the first boss part is arranged on the connecting part; the first boss part comprises a first plane section and a first slope section arranged on at least one side, in the width direction of the end cover, of the first plane section, and the thickness of the side, back to the first plane section, of the first slope section is smaller than the thickness of the portion, connected to the first plane section, of the first slope section; according to the battery monomer provided by the embodiment of the invention, under the condition of bulging, the surface of the first slope section is propped against the electrode assembly, and the probability that the electrode assembly is punctured can be effectively reduced through propping of the surface and the electrode assembly, so that the probability that the electrode assembly is short-circuited is effectively reduced.

Description

Technical Field

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

[0002] During use, individual battery cells may swell due to internal heat and gas generation. During this swelling, the end cap and its lower plastic insert deform, with the central area of ​​the lower plastic insert bulging outwards along with the central area of ​​the top cap. This causes the two ends of the lower plastic insert to bend inwards along its width, resulting in the corners of the lower plastic insert directly facing the electrode assembly. If the battery cell valve opens and the electrode assembly rises, the corners of the lower plastic insert may puncture the electrode assembly, causing a short circuit inside the electrode assembly. Utility Model Content

[0003] The purpose of this application is to provide a battery cell, a battery device, and an electrical device, which aims to solve the problem that the corner of the lower plastic may puncture the electrode assembly during the upward movement of the electrode assembly, causing a short circuit inside the electrode assembly.

[0004] To achieve the above objectives, the technical solution adopted in the embodiments of this application is as follows:

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing, an electrode assembly, and an end cap. The housing has an opening in a receiving cavity, and the electrode assembly is housed within the receiving cavity. The end cap covers the opening, and an insulating member is provided on the side of the end cap facing the electrode assembly. The insulating member includes a connecting portion and a first protrusion portion. The connecting portion is connected to the side wall of the end cap facing the electrode assembly, and the first protrusion portion is disposed on the connecting portion. The first protrusion portion includes a first planar segment and a first ramp segment disposed on at least one side of the first planar segment in the width direction of the end cap. The thickness of the first ramp segment on the side facing away from the first planar segment is less than the thickness of the first ramp segment connected to the first planar segment.

[0006] The beneficial effects of the embodiments of this application are as follows: When the battery cell provided in this application generates gas due to heat inside the cavity, the shell and end cap will bulge. The middle part of the end cap will bulge outward, causing the two ends of the end cap along the width direction to bend away from the bulging part in the middle. At this time, the insulating component will deform synchronously with the end cap. The first flat section of the first protrusion bulges away from the electrode assembly, and the first ramp section of the first protrusion deforms and bends towards the electrode assembly. The thickness of the side of the first ramp section away from the first flat section is less than the thickness of the side of the first ramp section connected to the first flat section. During the deformation and bending process, the surface of the first ramp section will abut against the electrode assembly. The contact between the surface of the first ramp section and the electrode assembly can effectively reduce the probability of the electrode assembly being punctured, thereby effectively reducing the probability of the electrode assembly being short-circuited.

[0007] In some embodiments, the surface of the first ramp segment facing the electrode assembly is a plane; or, the surface of the first ramp segment facing the electrode assembly is an arc surface.

[0008] By adopting the above technical solution, when the battery cell swells, the first ramp sections at opposite ends of the first protrusion bend toward the electrode assembly, so that the surface of the first ramp section facing the electrode assembly can abut against the electrode assembly. The probability of the planar or arc-shaped surface contacting the electrode assembly and puncturing the electrode assembly is low.

[0009] In some embodiments, the first ramp segment and the first planar segment are integrally formed on the connecting portion.

[0010] By adopting the above technical solution, the first ramp section, the first plane section and the connecting part are integrally formed, and the insulating parts can be connected and assembled as a whole, thereby effectively improving the assembly efficiency of the insulating parts.

[0011] In some embodiments, the first ramp segment is fixedly connected to the first planar segment, and the first ramp segment and the first planar segment are fixedly connected to the connecting portion.

[0012] By adopting the above technical solution, the first ramp segment and the first plane segment are connected to the connecting part, and different first ramp segments and first plane segments can be used in combination to improve the applicability.

[0013] In some embodiments, a first chamfer is provided between the side surface of the first ramp segment facing the electrode assembly and the side surface of the first ramp segment facing away from the first planar segment in the width direction;

[0014] And / or, a second chamfer is provided between the surface of the first ramp segment facing the electrode assembly and the surface of the first planar segment facing the electrode assembly.

[0015] By adopting the above technical solution, by setting a first chamfer, the sharp point between the side surface of the first ramp segment facing the electrode assembly and the side surface of the first ramp segment facing away from the first plane segment in the width direction can be replaced, and by setting a second chamfer, the sharp point between the connection between the first ramp segment and the first plane segment can be replaced, thereby further reducing the probability of the electrode assembly being punctured.

[0016] In some embodiments, the first chamfer is a rounded corner structure; and / or, the second chamfer is a rounded corner structure.

[0017] By adopting the above technical solution, using the first chamfer as a rounded corner structure and / or using the second chamfer as a rounded corner structure, the probability of the first chamfer and the second chamfer causing the electrode assembly to be punctured when they come into contact with the electrode assembly is lower.

[0018] In some embodiments, the fillet radius of the first chamfer is R1, where R1 ≥ 1 mm; and / or, the fillet radius of the second chamfer is R2, where R2 ≥ 1 mm.

[0019] By adopting the above technical solution, by setting the fillet radius R1 of the first chamfer to be greater than or equal to 1 mm, and / or by setting the fillet radius R2 of the second chamfer to be greater than or equal to 1 mm, the smoothness of the first chamfer and / or the second chamfer can be improved, thereby further reducing the probability of puncturing the electrode assembly.

[0020] In some embodiments, at least a portion of the first ramp section is a first heat-resistant portion, the melting point of which is greater than the melting point of the first planar section.

[0021] By adopting the above technical solution, the melting point of the first heat-resistant part is higher and it is less likely to soften, so the first slope section can maintain its supporting effect in a higher temperature environment.

[0022] In some embodiments, at least a portion of the first planar segment is a second heat-resistant portion, and the melting point of the first heat-resistant portion is greater than or equal to the melting point of the second heat-resistant portion.

[0023] By adopting the above technical solution, the heat resistance of the first planar section is improved by using the second heat-resistant part, so that the first boss part can still maintain its supporting function in a higher temperature environment.

[0024] In some embodiments, a first reinforcing structure is provided on the first ramp section, the first reinforcing structure being disposed on the side of the first ramp section opposite to the electrode assembly.

[0025] By adopting the above-mentioned technical solution, the support of the first slope section is improved by using the first reinforcing structure.

[0026] In some embodiments, the first ramp section is recessed inward on the side opposite to the electrode assembly to form a plurality of first grooves, the plurality of first grooves being distributed in a spaced manner along the length direction of the end cap, and the first reinforcing structure including a plurality of first reinforcing ribs formed between adjacent first grooves.

[0027] By adopting the above technical solution, the support strength of the first ramp section can be strengthened by using the first reinforcing rib, so as to improve the support stability of the first ramp section for the electrode assembly in the event of thermal runaway.

[0028] In some embodiments, a second reinforcing structure is provided on the first planar segment, the second reinforcing structure being disposed on the side of the first planar segment opposite to the electrode assembly.

[0029] By adopting the above-mentioned technical solution, the structural strength of the first planar segment is improved by using the second reinforcing structure.

[0030] In some embodiments, the first planar segment is recessed inward on the side opposite to the electrode assembly to form a plurality of second grooves, the plurality of second grooves being distributed in a spaced manner along the length direction of the end cap, and the second reinforcing structure including a plurality of second reinforcing ribs formed between adjacent second grooves.

[0031] By adopting the above technical solution, the structural strength of the first planar segment can be enhanced by using the second reinforcing rib.

[0032] In some embodiments, the distance between two adjacent first reinforcing ribs is less than or equal to the distance between two adjacent second reinforcing ribs in the length direction of the end cap.

[0033] By adopting the above technical solution, the spacing between the first reinforcing ribs is smaller, thereby the reinforcement effect of multiple first reinforcing ribs on the first slope section is better, so as to meet the support requirements of the first slope section abutting against the electrode assembly.

[0034] In some embodiments, the base thickness of the first planar segment is E, and the base thickness of the connecting portion is F, wherein E > F.

[0035] By adopting the above technical solution, by setting the base thickness of the first planar segment to be greater than the base thickness of the connecting part, the base thickness of the first planar segment is made thicker, thereby increasing the structural strength of the first planar segment.

[0036] In some embodiments, in the width direction, the width of the first ramp segment is M, and the width of the first planar segment is N, wherein 0.2≤M / N≤2.

[0037] By adopting the above technical solution, the ratio of the width M of the first ramp segment to the width N of the first planar segment is limited to the range of 0.2 to 2, so as to ensure that the first ramp segment has sufficient width to provide support, and to reduce the probability of puncturing the electrode assembly due to local stress concentration caused by the excessive proportion of the first planar segment.

[0038] In some embodiments, 0.5 ≤ M / N ≤ 1.5.

[0039] By adopting the above technical solution, and by further limiting the ratio of the width M of the first slope segment to the width N of the first plane segment to the range of 0.5 to 1.5, the relationship between the width M of the first slope segment and the width N of the first plane segment can be further optimized.

[0040] In some embodiments, N ≥ 5 mm.

[0041] By adopting the above technical solution, the width N of the first planar segment is limited to be greater than or equal to 5 mm, so that the first planar segment has sufficient width to meet its structural strength requirements.

[0042] In some embodiments, an angle G is formed between the side surface of the first ramp segment facing the electrode assembly and the side surface of the first planar segment facing the electrode assembly, wherein 140°≤G≤175°.

[0043] By adopting the above technical solution, by limiting the included angle G between the side surface of the first ramp segment facing the electrode assembly and the side surface of the first planar segment facing the electrode assembly to a range of 140° to 175°, the probability that the surface G of the first ramp segment is parallel to the surface of the electrode assembly when the first ramp segment is deformed and bent can be increased, thereby improving the support effect of the first ramp segment on the electrode assembly and reducing the probability of the electrode assembly being punctured.

[0044] In some embodiments, 150°≤G≤170°.

[0045] By adopting the above technical solution, the support effect of the first ramp section on the electrode assembly can be further improved, and the probability of the electrode assembly being punctured can be further reduced.

[0046] In some embodiments, an explosion-proof valve is provided on the end cap, and a through hole is provided on the connecting portion, the through hole communicating with the explosion-proof valve; the insulating member further includes a second boss portion, the second boss portion is provided on the side surface of the connecting portion facing the electrode assembly and covers the through hole; the second boss portion includes a second planar segment and a second ramp segment provided on at least one side of the second planar segment in the width direction of the end cap, the thickness of the second ramp segment on the side away from the second planar segment is less than the thickness of the second ramp segment on the side connected to the second planar segment; an avoidance hole is provided on the second planar segment, the avoidance hole communicating with the through hole.

[0047] By adopting the above technical solution, the second planar section can be connected to the through hole and the explosion-proof valve by opening the clearance hole, so that the explosion-proof valve can be used normally. At the same time, when the battery cell bulges, the second slope section on both sides of the opening end of the clearance hole can abut against the electrode assembly through the surface, thereby providing effective support for the electrode assembly and reducing the probability of the electrode assembly being punctured.

[0048] Secondly, embodiments of this application also provide a battery device, including the battery cell as described above.

[0049] The beneficial effects of the embodiments of this application are as follows: The battery device provided in the embodiments of this application includes the above-mentioned battery cell. When the battery cell swells, the probability of the electrode assembly being punctured is lower, and the stability of the battery device is better.

[0050] Thirdly, embodiments of this application also provide an electrical device, including a battery cell as described above, or a battery device as described above, wherein the battery cell or battery device is used to provide electrical energy.

[0051] The beneficial effects of the embodiments of this application are as follows: The electrical device provided in the embodiments of this application includes the above-mentioned battery cell or battery device, therefore, the stability of the electrical device is also better. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or related technologies 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 these drawings without creative effort.

[0053] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0054] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0055] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0056] Figure 4 This is a schematic diagram of the structure of the first ramp section of the first boss portion when it is a plane, provided in some embodiments of this application;

[0057] Figure 5 A schematic diagram of the structure of the first ramp section of the first boss portion provided in some embodiments of this application when the first ramp section is an arc surface;

[0058] Figure 6 This is a schematic diagram of the structure of a first type of insulating element provided in some embodiments of this application;

[0059] Figure 7 for Figure 6 An enlarged schematic diagram is provided at point A;

[0060] Figure 8 This is a schematic diagram of the structure of a second type of insulating element provided in some embodiments of this application;

[0061] Figure 9 This is a schematic diagram of the structure of a third type of insulating element provided in some embodiments of this application;

[0062] Figure 10 for Figure 9 A magnified diagram is provided at point B;

[0063] Figure 11 This is a schematic diagram of the structure of a fourth type of insulating element provided in some embodiments of this application;

[0064] Figure 12 for Figure 11 An enlarged schematic diagram is provided at point C;

[0065] Figure 13 Internal cross-sectional views of a battery cell provided in some embodiments of this application;

[0066] Figure 14 for Figure 13 An enlarged schematic diagram is provided at point D;

[0067] Figure 15 This is a structural schematic diagram of a fifth type of insulating element provided in some embodiments of this application.

[0068] The following are the labeling elements in the figure:

[0069] 1000, vehicles;

[0070] 100. Battery assembly; 200. Controller; 300. Motor;

[0071] 10. Box; 11. First box; 12. Second box;

[0072] 20. Battery cell;

[0073] 21. End cap; 21a. Electrode terminal; 211. Explosion-proof valve; X. Width direction; Y. Length direction;

[0074] 22. Housing; 221. Receiving cavity; 23. Electrode assembly; 23a. Electrode tab;

[0075] 24. Insulating components;

[0076] 241. Connecting part; 2411. Through hole;

[0077] 242, First boss portion; 2421, First planar segment; 2421a, Second reinforcing structure; 2421a1, Second groove; 2421a2, Second reinforcing rib; 2422, First ramp segment; 2422a, First chamfer; 2422b, Second chamfer; 2422c, First reinforcing structure; 2422c1, First groove; 2422c2, First reinforcing rib;

[0078] 243. Second boss section; 2431. Second planar section; 24311. Clearance hole; 2432. Second ramp section. Detailed Implementation

[0079] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0080] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0081] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0082] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction 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] 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.

[0084] During use, individual battery cells may swell due to internal heat and gas generation. During this swelling, the end cap and its lower plastic insert deform, with the central area of ​​the lower plastic insert bulging outwards along with the central area of ​​the top cap. This causes the two ends of the lower plastic insert to bend inwards along its width, resulting in the corners of the lower plastic insert directly facing the electrode assembly. If the battery cell valve opens and the electrode assembly rises, the corners of the lower plastic insert may puncture the electrode assembly, causing a short circuit inside the electrode assembly.

[0085] Based on the above considerations, in order to solve the problem that the corner of the lower plastic may puncture the electrode assembly during the upward movement of the electrode assembly, causing a short circuit inside the electrode assembly, a battery cell is designed. By setting the first protrusion of the insulating part to be a sloped section with a thickness on the side facing away from the first flat section that is less than the thickness on the side of the sloped section connected to the first flat section, when the battery cell bulges, the surface of the sloped section facing the battery cell will bend towards the electrode assembly and abut against the electrode assembly, which can effectively reduce the probability of the electrode assembly being punctured, and thus reduce the probability of a short circuit inside the electrode assembly.

[0086] The battery cells disclosed in this application can be used in electrical devices that use battery devices as a power source or in various energy storage systems that use battery devices as energy storage elements. Electrical devices can be, but are 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.

[0087] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0088] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0089] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 20, which are connected in series, parallel, or mixed connection via a busbar.

[0091] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 20.

[0092] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 into a single module. As an example, the battery module can be formed by bundling multiple battery cells 20 together with cable ties.

[0093] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery cell assemblies housed in the housing 10.

[0094] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 10 by fixing the battery module in the housing 10.

[0095] As an example, the battery cell assembly can also be housed in the housing 10 by directly fixing multiple battery cells 20 to the housing 10.

[0096] As an example, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 11 may be a top cover or a bottom plate.

[0097] As an example, the housing 10 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 10 forms an enclosed space to accommodate the battery cell assembly.

[0098] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0099] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 20, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0100] In this embodiment of the application, the battery cell 20 can be a secondary battery, which refers to a battery cell 20 that can be used again after the battery cell has been discharged by recharging to activate the active materials.

[0101] The battery cell 20 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.

[0102] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit constituting the battery device 100. For example... Figure 3 The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0103] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure or impact, giving battery cell 20 higher structural strength and improved reliability. Functional components such as electrode terminals 21a can be provided on end cap 21. Electrode terminals 21a can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism, such as explosion-proof valve 211, for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0104] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 closes the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The housing 22 can be made of various materials, such as, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0105] Electrode assembly 23 is the component in the battery cell 20 where electrochemical reactions occur. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab 23a. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals 21a to form a current loop.

[0106] According to some embodiments of this application, refer to Figure 3and Figure 6 This application provides a battery cell 20, including a housing 22, an electrode assembly 23, and an end cap 21. The housing 22 has an opening, a receiving cavity 221, and the electrode assembly 23 is housed within the receiving cavity 221. The end cap 21 covers the opening, and an insulating member 24 is provided on the side of the end cap 21 facing the electrode assembly 23. The insulating member 24 includes a connecting portion 241 and a first boss portion 242. The connecting portion 241 is connected to the wall surface of the end cap 21 facing the electrode assembly 23, and the first boss portion 242 is disposed on the connecting portion 241. The first boss portion 242 includes a first planar segment 2421 and a first ramp segment 2422 disposed on at least one side of the first planar segment 2421 in the width direction X of the end cap 21. The thickness of the first ramp segment 2422 on the side opposite to the first planar segment 2421 is less than the thickness of the first ramp segment 2422 connected to the first planar segment 2421.

[0107] The insulating component 24 has a structure with better insulation performance. The insulating component 24 can be used to isolate the end cap 21 from the electrical connection part 241 or electrode assembly 23 and other live structures in the housing 22 to reduce the risk of short circuit. For example, the insulating component 24 can be made of plastic, rubber or other materials.

[0108] The insulating component 24 includes a connecting portion 241 and a first protrusion portion 242. The connecting portion 241 can be of various structures, such as an insulating layer structure or a sheet structure, and can be fixed to the surface of the end cap 21 facing the electrode assembly 23 by means of adhesive bonding or other methods. The first protrusion portion 242 is disposed on the connecting portion 241 and serves to provide limiting support for the electrode assembly 23, reducing the risk of vertical movement of the electrode assembly 23. The first protrusion portion 242 can be an insulating block structure, and the number of first protrusion portions 242 can be one or more. For example, the number of first protrusions 242 can be one, and the first protrusion 242 can be disposed at any location of the connecting portion 241, such as in the middle region of the connecting portion 241; or, the number of first protrusions 242 can be two, and the two first protrusions 242 are respectively disposed at opposite ends of the connecting portion 241, for example, the first protrusions 242 are connected to opposite ends of the connecting portion 241 along the length direction of the end cap 21, or the first protrusions 242 are connected to opposite ends of the side surface of the connecting portion 241 facing the electrode assembly 23 along the length direction of the end cap 21; or, the number of first protrusions 242 can be three, one of the three first protrusions 242 is disposed in the middle of the connecting portion 241, and the other two of the three first protrusions 242 are respectively disposed at opposite ends of the connecting portion 241 along the length direction Y of the end cap 21.

[0109] The first boss portion 242 includes a first planar segment 2421 and a first ramp segment 2422. It should be understood that the first planar segment 2421 refers to a section of the first boss portion 242 that faces away from the end cap 21 and is parallel to the end cap 21. The surface of the first planar segment 2421 can be used to abut against the electrode assembly 23 to provide limiting support for the electrode assembly 23. The first ramp segment 2422 is disposed on at least one side of the first planar segment 2421 in the width direction X of the end cap 21. Optionally, the first ramp segment 2422 can be disposed only at either end of the first planar segment 2421 in the width direction X of the end cap 21; or, the first ramp segment 2422 can be disposed at both opposite ends of the first planar segment 2421 in the width direction X of the end cap 21.

[0110] It should be understood that the first ramp segment 2422 refers to a section of the first boss portion 242 in which the surface facing away from the end cap 21 is inclined to the surface of the end cap 21; and the thickness of the side of the first ramp segment 2422 facing away from the first flat segment 2421 is less than the thickness of the first ramp segment 2422 where it connects to the first flat segment 2421, that is, the side of the first ramp segment 2422 away from the first flat segment 2421 is offset from the end cap 21. When the battery cell 20 bulges, the first flat segment 2421 will bulge away from the electrode assembly 23 and the first ramp segment 2422 will bend and deform toward the electrode assembly 23; thus, the side of the first ramp segment 2422 with less thickness has a greater deformation, and the entire first ramp segment 2422 will bend and deform, forming a surface facing away from the end cap 21 that is approximately parallel to the surface of the electrode assembly 23. Thus, even if bulging occurs, the first ramp section 2422 can continue to provide large-area support for the electrode assembly 23, thereby effectively reducing the probability of the electrode assembly 23 being punctured.

[0111] When the battery cell 20 provided in this embodiment generates gas inside the receiving cavity 221 due to heat, the casing 22 and the end cap 21 will bulge. The middle part of the end cap 21 will bulge outward, causing the two ends of the end cap 21 along the width direction X to bend away from the bulging part in the middle. At this time, the insulating member 24 will deform synchronously with the end cap 21. The first planar section 2421 of the first protrusion 242 bulges away from the electrode assembly 23, and the first ramp section 2422 of the first protrusion 242 faces towards... When the electrode assembly 23 deforms and bends, the thickness of the side of the first ramp segment 2422 facing away from the first flat segment 2421 is less than the thickness of the first ramp segment 2422 where it connects to the first flat segment 2421. During the deformation and bending process, the surface of the first ramp segment 2422 will abut against the electrode assembly 23. The contact between the surface of the first ramp segment 2422 and the electrode assembly 23 can effectively reduce the probability of the electrode assembly 23 being punctured, thereby effectively reducing the probability of the electrode assembly 23 short-circuiting.

[0112] Please refer to Figures 3 to 5 In some embodiments, the surface of the first ramp segment 2422 facing the electrode assembly 23 is a plane; or, the surface of the first ramp segment 2422 facing the electrode assembly 23 is an arc surface.

[0113] In some embodiments, the surface of the first ramp segment 2422 facing the electrode assembly 23 is flat. When the battery cell 20 bulges, the insulating member 24 deforms simultaneously with the end cap 21. The first flat segment 2421 of the first protrusion portion 242 bulges away from the electrode assembly 23, and the first ramp segment 2422 of the first protrusion portion 242 deforms and bends towards the electrode assembly 23. The side of the first ramp segment 2422 with less thickness has greater deformation. Thus, the entire first ramp segment 2422 will bend and deform, forming a state where the surface of the first ramp segment 2422 facing the electrode assembly 23 is approximately parallel to the surface of the electrode assembly 23. In this way, when the surface of the first ramp segment 2422 facing the electrode assembly 23 is flat, the first ramp segment 2422 provides better support for the electrode assembly 23.

[0114] In other embodiments, when the surface of the first ramp segment 2422 facing the electrode assembly 23 is an arc surface, such as an outwardly convex arc surface, when the battery cell 20 bulges, the first ramp segment 2422 deforms and the surface of the first ramp segment 2422 facing the electrode assembly 23 directly abuts against the electrode assembly 23. In this case, the arc surface abutting against the electrode assembly 23 also has a better support effect.

[0115] With this configuration, when the battery cell 20 bulges, the first ramp sections 2422 at opposite ends of the first protrusion 242 bend toward the electrode assembly 23, so that the surface of the first ramp section 2422 facing the electrode assembly 23 can abut against the electrode assembly 23. The probability of the planar or arc-shaped surface contacting the electrode assembly 23 and puncturing the electrode assembly 23 is low.

[0116] Please refer to Figure 6 In some embodiments, the first ramp segment 2422 and the first planar segment 2421 are integrally formed on the connecting portion 241.

[0117] In this embodiment, the first ramp section 2422 and the first flat section 2421 can be integrally formed with the connecting part 241. Thus, during the assembly process, it is only necessary to assemble the connecting part 241 onto the end cap 21, and the first ramp section 2422 and the first flat section 2421 can be assembled simultaneously.

[0118] With this configuration, the first ramp section 2422, the first flat section 2421, and the connecting part 241 are integrally formed, and the insulating part 24 can be connected and assembled as a whole, thereby effectively improving the assembly efficiency of the insulating part 24.

[0119] Please refer to Figure 8 In some embodiments, the first ramp segment 2422 is fixedly connected to the first planar segment 2421, and the first ramp segment 2422 and the first planar segment 2421 are fixedly connected to the connecting portion 241.

[0120] In this embodiment, the first ramp segment 2422 can be fixedly connected to the connecting portion 241 by means of bonding, fusion bonding, or other methods. The first flat segment 2421 can be fixedly connected to the connecting portion 241 by means of bonding, fusion bonding, or other methods. Similarly, the first ramp segment 2422 and the first flat segment 2421 can also be connected and fixedly connected by means of bonding, fusion bonding, or other methods.

[0121] With this configuration, the first ramp section 2422 and the first flat section 2421 are connected to each other or fixed to the connecting part 241 by means of bonding or other methods. In this way, the first ramp section 2422 and the first flat section 2421 can be used in combination with different materials to improve the applicability.

[0122] Please refer to Figure 3 , Figure 6 and Figure 7 In some embodiments, a first chamfer 2422a is provided between the side surface of the first ramp segment 2422 facing the electrode assembly 23 and the side surface of the first ramp segment 2422 facing away from the first planar segment 2421 in the width direction X; and / or, a second chamfer 2422b is provided between the side surface of the first ramp segment 2422 facing the electrode assembly 23 and the side surface of the first planar segment 2421 facing the electrode assembly 23.

[0123] Specifically, a first chamfer 2422a is provided between the side surface of the first ramp segment 2422 facing the electrode assembly 23 and the side surface of the first ramp segment 2422 facing away from the first flat segment 2421 in the width direction X. That is, the sharp junction formed between the side surface of the first ramp segment 2422 facing the electrode assembly 23 and the side surface of the first ramp segment 2422 facing away from the first flat segment 2421 in the width direction X of the end cap 21 is replaced by the first chamfer 2422a.

[0124] Optionally, the first chamfer 2422a may be, but is not limited to, a right angle, a rounded corner, etc.

[0125] Similarly, by providing a second chamfer 2422b between the side surface of the first ramp segment 2422 facing the electrode assembly 23 and the side surface of the first flat segment 2421 facing the electrode assembly 23, the sharp junction formed between the side surface of the first ramp segment 2422 facing the electrode assembly 23 and the side surface of the first flat segment 2421 facing the electrode assembly 23 is replaced by the second chamfer 2422b.

[0126] Optionally, the second chamfer 2422b can be, but is not limited to, a right angle, a rounded corner, etc.

[0127] With this configuration, the first chamfer 2422a can replace the sharp point between the side surface of the first ramp segment 2422 facing the electrode assembly 23 and the side surface of the first ramp segment 2422 facing away from the first flat segment 2421 in the width direction X, and the second chamfer 2422b can replace the sharp point between the connection between the first ramp segment 2422 and the first flat segment 2421, thereby further reducing the probability of the electrode assembly 23 being punctured.

[0128] Please refer to Figure 3 , Figure 6 and Figure 7 In some embodiments, the first chamfer 2422a is a rounded corner structure; and / or, the second chamfer 2422b is a rounded corner structure.

[0129] Understandably, a rounded corner structure refers to a structure that removes sharp corners to form a smooth, curved edge.

[0130] With this configuration, using the first chamfer 2422a as a rounded corner structure and / or using the second chamfer 2422b as a rounded corner structure, the probability of the first chamfer 2422a and the second chamfer 2422b causing the electrode assembly 23 to be punctured when they come into contact with the electrode assembly 23 is lower.

[0131] Please refer to Figure 3 , Figure 6 and Figure 7 In some embodiments, the fillet radius of the first chamfer 2422a is R1, R1≥1mm; and / or, the fillet radius of the second chamfer 2422b is R2, R2≥1mm.

[0132] The fillet radius of the first chamfer 2422a and the second chamfer 2422b refers to the radius of the arc formed during the filleting process. It should be understood that this radius determines the smoothness of the chamfered structure; a larger radius will result in a smoother chamfer.

[0133] The fillet radius R1 of the first chamfer 2422a is ≥ 1mm; optionally, the fillet radius R1 of the first chamfer 2422a may be, but is not limited to, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.7mm, 3mm, 3.1mm, 3.4mm, 3.6mm, 3.9mm, 4.2mm, 4.5mm, 4.8mm, 5mm, etc.

[0134] The fillet radius R2 of the second chamfer 2422b is ≥ 1mm; optionally, the fillet radius R2 of the second chamfer 2422b may be, but is not limited to, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.7mm, 3mm, 3.1mm, 3.4mm, 3.6mm, 3.9mm, 4.2mm, 4.5mm, 4.8mm, 5mm, etc.

[0135] By setting the fillet radius R1 of the first chamfer 2422a to be greater than or equal to 1 mm, and / or by setting the fillet radius R2 of the second chamfer 2422b to be greater than or equal to 1 mm, the smoothness of the first and / or second fillets can be improved, thereby further reducing the probability of puncturing the electrode assembly 23.

[0136] Please refer to Figure 3 and Figure 6 In some embodiments, at least a portion of the first ramp segment 2422 is a first heat-resistant portion (not shown in the figure), the melting point of which is greater than the melting point of the first planar segment 2421.

[0137] The first heat-resistant part refers to a material component with superior high-temperature resistance. It should be understood that the high-temperature resistance of the first heat-resistant part is superior to that of the portions of the first slope section 2422 that are not part of the first heat-resistant part. Therefore, the melting point of the first heat-resistant part should be greater than that of other portions of the first slope section 2422 that are not part of the first heat-resistant part. Optionally, the first heat-resistant part may be, but is not limited to, a layered structure or a bulk structure formed of high-temperature resistant materials such as polyimide or polytetrafluoroethylene.

[0138] At least a portion of the first ramp segment 2422 is a first heat-resistant portion. Optionally, a portion of the first ramp segment 2422 can be replaced by a first heat-resistant portion. For example, the end of the first ramp segment 2422 along the width direction X of the end cap 21 and away from the first planar segment 2421 can be a first heat-resistant portion, while other portions of the first ramp segment 2422 can be ordinary insulating structures, such as plastic structures. The first heat-resistant portion and other portions of the first ramp segment 2422, excluding the first heat-resistant portion, can be fixedly connected by adhesive or other means. Alternatively, the first ramp segment 2422 can consist entirely of the first heat-resistant portion, that is, the first ramp segment 2422 is composed of the first heat-resistant portion.

[0139] It should be understood that the first ramp segment 2422 is located at opposite ends of the first planar segment 2421 along the width direction X of the end cap 21, that is, the first ramp segment 2422 is closer to the two end housing portions 22 located along the width direction X of the end cap 21; in the event of thermal runaway, the thermal runaway gas will flow in the gap region between the electrode assembly 23 and the housing 22, so the temperature in the region where the first ramp segment 2422 is located is higher. With this configuration, at least a portion of the first ramp segment 2422 is set as a first heat-resistant part, which has a higher melting point and is less prone to softening, so the first ramp segment 2422 can maintain its supporting effect in higher temperature environments.

[0140] Please refer to Figure 3 and Figure 6 In some embodiments, at least a portion of the first planar segment 2421 is a second heat-resistant portion (not shown in the figure), and the melting point of the first heat-resistant portion is greater than or equal to the melting point of the second heat-resistant portion.

[0141] The second heat-resistant section refers to a material component with superior high-temperature resistance. It should be understood that the high-temperature resistance of the second heat-resistant section is superior to that of the parts of the first planar segment 2421 that are not part of the second heat-resistant section. Therefore, the melting point of the second heat-resistant section should be greater than that of other parts of the first planar segment 2421 that are not part of the second heat-resistant section. Optionally, the second heat-resistant section may be, but is not limited to, a layered structure or a bulk structure formed of high-temperature resistant materials such as polyimide or polytetrafluoroethylene.

[0142] At least a portion of the first planar segment 2421 is a second heat-resistant portion. Optionally, a portion of the first planar segment 2421 can be replaced by a second heat-resistant portion. For example, the surface portion of the first planar segment 2421 facing away from the connecting portion 241 can be a second heat-resistant portion, or the portion of the first planar segment 2421 connecting to the first ramp segment 2422 can be a second heat-resistant portion, etc. The other portions of the first planar segment 2421 can be ordinary insulating structures, such as plastic structures, etc. The second heat-resistant portion and the other portions of the first planar segment 2421, except for the second heat-resistant portion, can be fixedly connected by adhesive or other means. Alternatively, the first planar segment 2421 can consist entirely of second heat-resistant portions, that is, the first planar segment 2421 is composed of second heat-resistant portions.

[0143] Optionally, the melting point of the second heat-resistant part may be the same as that of the first heat-resistant part; or, the melting point of the first heat-resistant part may be greater than that of the second heat-resistant part.

[0144] With this configuration, the heat resistance of the first planar section 2421 is improved by using the second heat-resistant part, so that the first planar section 2421 also has better high-temperature resistance, and the first boss part 242 can still maintain its supporting function in higher temperature environments.

[0145] Please refer to Figure 3 , Figure 9 and Figure 10 In some embodiments, a first reinforcing structure 2422c is provided on the first ramp section 2422, and the first reinforcing structure 2422c is provided on the side of the first ramp section 2422 facing away from the electrode assembly 23.

[0146] The first reinforcing structure 2422c is used to strengthen the overall structural strength of the first slope section 2422. Optionally, the first reinforcing structure 2422c may be, but is not limited to, a reinforcing rib, a reinforcing strip, a reinforcing block, etc. The first reinforcing structure 2422c may be fixedly connected to the first slope section 2422 by means of bonding, fusion bonding, etc. Alternatively, the first reinforcing structure 2422c may be integrally formed on the first slope section 2422.

[0147] For example, in some embodiments, the first reinforcing structure 2422c can be a reinforcing rib, which can be fixedly connected to the first ramp section 2422 by adhesive bonding, for example, fixed to the side of the first ramp section 2422 facing away from the electrode assembly 23. Alternatively, in other embodiments, the first reinforcing structure 2422c can be a plurality of reinforcing rib protrusions integrally formed on the first ramp section 2422, which can be formed at the end of the first ramp section 2422 facing away from the electrode assembly 23.

[0148] With this configuration, the first reinforcing structure 2422c is used to enhance the support of the first ramp section 2422, so that when the battery cell 20 bulges, the first ramp section 2422 can be more stably supported on the electrode assembly 23.

[0149] Please refer to Figure 3 , Figures 9 to 12 In some embodiments, the first ramp section 2422 is recessed inward on the side opposite to the electrode assembly 23 to form a plurality of first grooves 2422c1. The plurality of first grooves 2422c1 are distributed in a spaced manner along the length direction Y of the end cap 21. The first reinforcing structure 2422c includes a plurality of first reinforcing ribs 2422c2 formed between adjacent first grooves 2422c1.

[0150] The first slope section 2422 is recessed inward on the side opposite to the electrode assembly 23 to form a plurality of first grooves 2422c1. Thus, the wall portion between two adjacent first grooves 2422c1 is used to form the first reinforcing ribs 2422c2 for reinforcing effect.

[0151] When multiple first grooves 2422c1 are distributed at intervals along the length Y of the end cap 21, the first reinforcing ribs 2422c2 formed between adjacent first grooves 2422c1 will also be distributed at intervals along the length Y of the end cap 21. It should be understood that the more first grooves 2422c1 there are, the more first reinforcing ribs 2422c2 there are, and the better the reinforcement effect of multiple first reinforcing ribs 2422c2 on the first ramp section 2422.

[0152] It should be understood that in this embodiment, the side of the first ramp segment 2422 facing away from the electrode assembly 23 needs to be connected to the surface of the end cap 21, that is, the surface of the first ramp segment 2422 facing away from the electrode assembly 23 is flush with the surface of the connecting portion 241. At the same time, the first groove 2422c1 is formed by the inward indentation of the side of the first ramp segment 2422 facing away from the electrode assembly 23. Therefore, the surface of the first reinforcing rib 2422c2 formed between adjacent first grooves 2422c1 is the surface of the first ramp segment 2422. While the first reinforcing rib 2422c2 plays a structural strengthening role, the first reinforcing rib 2422c2 has a low impact on the connection of the first ramp segment 2422 to the end cap 21.

[0153] With this configuration, the first reinforcing rib 2422c2 can be used to strengthen the support strength of the first ramp section 2422, thereby improving the support stability of the first ramp section 2422 to the electrode assembly 23 in the event of thermal runaway.

[0154] Please refer to Figure 3 , Figures 9 to 12 In some embodiments, a second reinforcing structure 2421a is provided on the first planar segment 2421, and the second reinforcing structure 2421a is provided on the side of the first planar segment 2421 facing away from the electrode assembly 23.

[0155] The second reinforcing structure 2421a is used to strengthen the overall structural strength of the first planar segment 2421. Optionally, the second reinforcing structure 2421a may be, but is not limited to, a reinforcing rib, a reinforcing strip, a reinforcing block, etc. The second reinforcing structure 2421a may be fixedly connected to the first planar segment 2421 by means of bonding, fusion bonding, etc. Alternatively, the second reinforcing structure 2421a may be integrally formed on the first planar segment 2421.

[0156] For example, in some embodiments, the second reinforcing structure 2421a can be a reinforcing rib, which can be fixedly connected to the first planar segment 2421 by adhesive bonding, for example, fixed to the side of the first planar segment 2421 facing away from the electrode assembly 23. Alternatively, in other embodiments, the second reinforcing structure 2421a can be a plurality of reinforcing rib protrusions integrally formed on the first planar segment 2421, which can be formed at the end of the first planar segment 2421 facing away from the electrode assembly 23.

[0157] With this configuration, the structural strength of the first planar segment 2421 can be enhanced by utilizing the second reinforcing structure 2421a.

[0158] Please refer to Figure 3 , Figures 9 to 12 In some embodiments, the first planar segment 2421 is recessed inward on the side opposite to the electrode assembly 23 to form a plurality of second grooves 2421a1. The plurality of second grooves 2421a1 are distributed in a spaced manner along the length direction Y of the end cap 21. The second reinforcing structure 2421a includes a plurality of second reinforcing ribs 2421a2 formed between adjacent second grooves 2421a1.

[0159] The first planar segment 2421 is recessed inward on the side opposite to the electrode assembly 23 to form a plurality of second grooves 2421a1. Thus, the wall portion between two adjacent second grooves 2421a1 is used to form a second reinforcing rib 2421a2 for reinforcing effect.

[0160] When multiple second grooves 2421a1 are distributed at intervals along the length Y of the end cap 21, the second reinforcing ribs 2421a2 formed between adjacent second grooves 2421a1 will also be distributed at intervals along the length Y of the end cap 21. It should be understood that the more second grooves 2421a1 there are, the more second reinforcing ribs 2421a2 there are, and the reinforcement effect of multiple second reinforcing ribs 2421a2 on the first planar segment 2421 is better.

[0161] It should be understood that in this embodiment, the side of the first planar segment 2421 facing away from the electrode assembly 23 needs to be connected to the surface of the end cap 21, that is, the surface of the first planar segment 2421 facing away from the electrode assembly 23 is flush with the surface of the connecting portion 241. At the same time, the second groove 2421a1 is formed by the inward indentation of the side of the first planar segment 2421 facing away from the electrode assembly 23. Therefore, the surface of the second reinforcing rib 2421a2 formed between adjacent second grooves 2421a1 is the surface of the first planar segment 2421. While the second reinforcing rib 2421a2 plays a structural strengthening role, the second reinforcing rib 2421a2 has a low impact on the connection of the first planar segment 2421 to the end cap 21.

[0162] Optionally, in some embodiments, the first groove 2422c1 and the second groove 2421a1 can be correspondingly connected, that is, the first groove 2422c1 and the second groove 2421a1 are connected to form a complete groove structure. Thus, in the length direction Y of the end cap 21, the first reinforcing rib 2422c2 formed between two adjacent first grooves 2422c1, and the second reinforcing rib 2421a2 formed between two corresponding adjacent second grooves 2421a1 connected to the first groove 2422c1, are connected to form a larger, complete rib structure. This complete rib structure is used to simultaneously reinforce the first ramp section 2422 and the first planar section 2421; specifically as follows... Figure 9 and Figure 10 As shown.

[0163] Alternatively, in some embodiments, the first groove 2422c1 and the second groove 2421a1 are independently arranged, thereby the first reinforcing rib 2422c2 formed between two adjacent first grooves 2422c1 and the second reinforcing rib 2421a2 formed between two adjacent second grooves 2421a1 are also independently arranged; the first reinforcing rib 2422c2 and the second reinforcing rib 2421a2 are respectively used to structurally reinforce the first ramp section 2422 and the first planar section 2421. Optionally, the distance between two adjacent first grooves 2422c1 and the distance between two adjacent second grooves 2421a1 can be the same or different; when the distance between two adjacent first grooves 2422c1 and the distance between two adjacent second grooves 2421a1 are different, for example, the distance between two adjacent first grooves 2422c1 is smaller than the distance between two adjacent second grooves 2421a1, specifically as follows: Figure 11 and Figure 12 As shown; at this time, the number of first reinforcing ribs 2422c2 is greater than the number of second reinforcing ribs 2421a2, and the first reinforcing ribs 2422c2 have a better reinforcing effect on the first slope section 2422.

[0164] With this configuration, the structural strength of the first planar segment 2421 can be enhanced by using the second reinforcing rib 2421a2, thereby further improving the structural strength of the first boss portion 242.

[0165] Please refer to Figure 3 , Figure 11 and Figure 12 In some embodiments, the distance between two adjacent first reinforcing ribs 2422c2 is less than or equal to the distance between two adjacent second reinforcing ribs 2421a2 in the length direction Y of the end cap 21.

[0166] Understandably, the spacing between two adjacent first reinforcing ribs 2422c2 is less than or equal to the spacing between two adjacent second reinforcing ribs 2421a2, that is, the first reinforcing ribs 2422c2 are arranged more densely, and the first reinforcing ribs 2422c2 have a better reinforcing effect on the first slope section 2422.

[0167] It should be understood that when the battery cell 20 bulges, the first ramp sections 2422 at opposite ends of the first protrusion 242 bend toward the electrode assembly 23, so that the side surface of the first ramp section 2422 facing the electrode assembly 23 will abut against the electrode assembly 23; that is, the first ramp section 2422 is used to directly form an abutment support for the electrode assembly 23.

[0168] This configuration utilizes denser first reinforcing ribs 2422c2 to create a better structural reinforcement effect on the first ramp section 2422, thereby meeting the support requirements of the first ramp section 2422 abutting against the electrode assembly 23.

[0169] Please refer to Figure 13 and Figure 14 In some embodiments, the base thickness of the first planar segment 2421 is E, and the base thickness of the connecting portion 241 is F, wherein E > F.

[0170] Wherein, the base thickness E of the first planar segment 2421 refers to the thickness distance formed between the side surface of the first planar segment 2421 facing the electrode assembly 23 and the inner bottom wall of the second groove 2421a1.

[0171] The base thickness F of the connector 241 refers to the thickness distance formed between the side surface of the connector 241 facing the electrode assembly 23 and the other side surface of the connector 241 facing away from the electrode assembly 23.

[0172] By setting the base thickness of the first planar segment 2421 to be greater than the base thickness of the connecting portion 241, the base thickness of the first planar segment 2421 is made thicker, thereby making the structural strength of the first boss portion 242 where the first planar segment 2421 is located higher.

[0173] Please refer to Figure 3 , Figure 4 and Figure 6 In the width direction X, the width of the first ramp segment 2422 is M, and the width of the first planar segment 2421 is N, where 0.2≤M / N≤2.

[0174] Wherein, the width M of the first ramp segment 2422 refers to the dimension of the first ramp segment 2422 in the width direction X along the end cap 21; similarly, the width N of the first flat segment 2421 refers to the dimension of the first flat segment 2421 in the width direction X along the end cap 21.

[0175] In this embodiment, the ratio of the width M of the first ramp segment 2422 to the width N of the first planar segment 2421 is limited to be greater than or equal to 0.2, that is, the width M of the first ramp segment 2422 is greater than or equal to 0.2 times the width N of the first planar segment 2421; that is, the width M of the first ramp segment 2422 cannot be too small compared to the width N of the first planar segment 2421, and the first ramp segment 2422 needs to have sufficient width to meet the support requirements.

[0176] Meanwhile, the ratio of the width M of the first ramp segment 2422 to the width N of the first planar segment 2421 is limited to less than or equal to 2, that is, the width M of the first ramp segment 2422 is less than or equal to twice the width N of the first planar segment 2421; that is, the width M of the first ramp segment 2422 cannot be too large compared to the width N of the first planar segment 2421, so as to reduce the impact of the first ramp segment 2422 on the assembly inside the housing 22.

[0177] This configuration limits the ratio of the width M of the first ramp segment 2422 to the width N of the first planar segment 2421 to a range of 0.2 to 2, ensuring that the first ramp segment 2422 has sufficient width to provide support and reducing the probability of puncturing the electrode assembly 23 due to local stress concentration caused by the excessive proportion of the first planar segment 2421.

[0178] Please refer to Figure 4 In some embodiments, 0.5 ≤ M / N ≤ 1.5.

[0179] By further limiting the ratio of the width M of the first ramp segment 2422 to the width N of the first plane segment 2421 to the range of 0.5 to 1.5, the relationship between the width M of the first ramp segment 2422 and the width N of the first plane segment 2421 can be further optimized.

[0180] Please refer to Figure 4 In some embodiments, N ≥ 5 mm.

[0181] In this embodiment, the width N of the first planar segment 2421 should be greater than or equal to 5 mm so that the first planar segment 2421 has sufficient structural strength.

[0182] Optionally, the width N of the first planar segment 2421 may be, but is not limited to, 5mm, 5.1mm, 5.5mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.9mm, 7mm, 7.3mm, 7.5mm, 7.9mm, 8mm, 8.2mm, 8.5mm, 8.7mm, 9mm, 9.3mm, 9.5mm, 9.8mm, 10mm, etc.

[0183] This configuration, by limiting the width N of the first planar segment 2421 to greater than or equal to 5 millimeters, ensures that the first planar segment 2421 has sufficient width to meet its structural strength requirements.

[0184] Please refer to Figure 3 , Figure 4 and Figure 6 In some embodiments, an angle G is formed between the side surface of the first ramp segment 2422 facing the electrode assembly 23 and the side surface of the first planar segment 2421 facing the electrode assembly 23, where 140°≤G≤175°.

[0185] It should be understood that when the side surface of the end cap 21 facing the electrode assembly 23 is taken as the reference plane, the first ramp segment 2422 is inclined relative to the surface of the end cap 21, and the first flat segment 2421 is parallel to the surface of the end cap 21.

[0186] Optionally, the included angle G formed between the side surface of the first ramp segment 2422 facing the electrode assembly 23 and the side surface of the first planar segment 2421 facing the electrode assembly 23 can be, but is not limited to, 140°, 145°, 150°, 155°, 160°, 165°, 170°, 175°, etc.

[0187] By limiting the included angle G between the side surface of the first ramp segment 2422 facing the electrode assembly 23 and the side surface of the first planar segment 2421 facing the electrode assembly 23 to a range of 140° to 175°, the probability that the surface of the first ramp segment 2422 will be parallel to the surface of the electrode assembly 23 when deformed and bent can be increased, thereby improving the supporting effect of the first ramp segment 2422 on the electrode assembly 23 and reducing the probability that the electrode assembly 23 will be punctured.

[0188] Please refer to Figure 3 , Figure 4 and Figure 6 In some embodiments, 150°≤G≤170°.

[0189] Optionally, the included angle G formed between the side surface of the first ramp segment 2422 facing the electrode assembly 23 and the side surface of the first planar segment 2421 facing the electrode assembly 23 may be, but is not limited to, 150°, 151°, 152°, 153°, 154°, 155°, 156°, 157°, 158°, 159°, 160°, 161°, 162°, 163°, 164°, 165°, 166°, 167°, 168°, 169°, 170°, etc.

[0190] This design can further enhance the support effect of the first ramp section 2422 on the electrode assembly 23 and further reduce the probability of the electrode assembly 23 being punctured.

[0191] Please refer to Figure 3 and Figure 15 In some embodiments, an explosion-proof valve 211 is provided on the end cap 21, and a through hole 2411 is provided on the connecting part 241, the through hole 2411 being connected to the explosion-proof valve 211; the insulating member 24 also includes a second boss portion 243, the second boss portion 243 being provided on the side surface of the connecting part 241 facing the electrode assembly 23 and covering the through hole 2411; the second boss portion 243 includes a second planar segment 2431 and a second ramp segment 2432 provided on at least one side of the second planar segment 2431 in the width direction X of the end cap 21, the thickness of the side of the second ramp segment 2432 facing away from the second planar segment 2431 is less than the thickness of the side of the second ramp segment 2432 connected to the second planar segment 2431; an avoidance hole 24311 is provided on the second planar segment 2431, the avoidance hole 24311 being connected to the through hole 2411.

[0192] The through hole 2411 on the connecting part 241 is used to form a connection with the explosion-proof valve 211. Optionally, the through hole 2411 can be a relatively large hole on the connecting part 241, such as an oblong hole or a round hole; the projection of the explosion-proof valve 211 in the thickness direction of the connecting part 241 can be completely located within the through hole 2411. Alternatively, the through hole 2411 can be a combination of multiple holes on the connecting part 241, such as multiple mesh structures, using multiple holes to connect to the explosion-proof valve 211.

[0193] The insulating member 24 includes a second boss portion 243, which is disposed on the side surface of the connecting portion 241 facing the electrode assembly 23. Optionally, the second boss portion 243 can be fixedly connected to the connecting portion 241 by means of bonding, fusion bonding or other methods, or the second boss portion 243 can be integrally formed with the connecting portion 241.

[0194] The second protrusion 243 serves to provide limiting support for the electrode assembly 23, thereby reducing the risk of vertical movement of the electrode assembly 23. The second protrusion 243 can be an insulating block structure, and the number of second protrusions 243 can be one or more.

[0195] The second boss portion 243 covers the through hole 2411; it should be understood that in some embodiments, the explosion-proof valve 211 may be provided in the middle of the end cap 21, thereby the through hole 2411 is opened in the middle of the connecting portion 241, that is, the second boss portion 243 may be provided in the middle of the side surface of the connecting portion 241 facing the electrode assembly 23.

[0196] The second protrusion 243 includes a second planar segment 2431 and a second inclined segment. It should be understood that the second planar segment 2431 refers to a section of structure facing away from the connecting portion 241 and parallel to the end cap 21. The second planar segment 2431 can be integrally connected to the connecting portion 241 by means of bonding, fusion bonding, or integral molding. The surface of the second planar segment 2431 can be used to abut against the electrode assembly 23 to provide limiting and support for the electrode assembly 23.

[0197] The second planar segment 2431 is provided with a clearance hole 24311. It should be understood that the clearance hole 24311 is used to connect to the through hole 2411 on the connecting portion 241, so that the explosion-proof valve 211 can connect to the receiving cavity 221 through the through hole 2411 and the clearance hole 24311, thereby enabling the explosion-proof valve 211 to achieve pressure relief. Optionally, the clearance hole 24311 can be a relatively large hole on the second planar segment 2431, such as an oblong hole or a round hole; the clearance hole 24311 can be directly opposite the through hole 2411. Alternatively, the clearance hole 24311 can be a combination of multiple holes on the second planar segment 2431, such as multiple mesh structures, with multiple holes jointly connected to the through hole 2411.

[0198] The second ramp section 2432 is disposed on at least one side of the second planar section 2431 in the width direction X of the end cap 21; optionally, the second ramp section 2432 may be disposed only at either end of the second planar section 2431 in the width direction X of the end cap 21; or, the second ramp section 2432 may be disposed at both opposite ends of the second planar section 2431 in the width direction X of the end cap 21.

[0199] It should be understood that the second ramp segment 2432 refers to a section of the second boss portion 243 in which the surface facing away from the connecting portion 241 is inclined to the surface of the end cap 21; and the thickness of the side of the second ramp segment 2432 facing away from the second flat segment 2431 is less than the thickness of the side of the second ramp segment 2432 connected to the second flat segment 2431, that is, the side of the second ramp segment 2432 away from the second flat segment 2431 is closer to the end cap 21 and forms an offset. When the battery cell 20 bulges, the second flat segment 2431 will bulge away from the electrode assembly 23 and the second ramp segment 2432 will bend and deform toward the electrode assembly 23; thus, the side of the second ramp segment 2432 with smaller thickness has a larger deformation, and the entire second ramp segment 2432 will bend and deform, forming a surface facing away from the connecting portion 241 that is approximately parallel to the surface of the electrode assembly 23. Thus, even in the event of bulging, the second ramp section 2432 can continue to provide large-area support for the electrode assembly 23, thereby effectively reducing the probability of the electrode assembly 23 being punctured. The second ramp section 2432 can be connected to the connecting part 241 to form an integral unit through methods such as bonding, fusion bonding, or integral molding.

[0200] In some embodiments, the materials and connection methods of the second planar segment 2431 and the second ramp segment 2432 are completely the same as those of the first planar segment 2421 and the first ramp segment 2422. Therefore, the materials and connection methods of the second planar segment 2431 and the second ramp segment 2432 will not be described again here.

[0201] With this configuration, the second planar segment 2431 can communicate with the through hole 2411 and the explosion-proof valve 211 by opening the clearance hole 24311, so that the explosion-proof valve 211 can be used normally. At the same time, when the battery cell 20 bulges, the second ramp segments 2432 located on both sides of the opening end of the clearance hole 24311 can abut against the electrode assembly 23 through their surfaces, thereby providing effective support for the electrode assembly 23 and reducing the probability of the electrode assembly 23 being punctured.

[0202] The battery cell 20 of this application will now be further described according to specific embodiments.

[0203] Please refer to Figures 3 to 15 In this embodiment, the battery cell 20 includes a housing 22, an electrode assembly 23, and an end cap 21. The housing 22 is provided with an opening in a receiving cavity 221, and the electrode assembly 23 is housed in the receiving cavity 221. The end cap 21 covers the opening, and an insulating member 24 is provided on the side of the end cap 21 facing the electrode assembly 23.

[0204] The insulating component 24 includes a connecting portion 241, a first boss portion 242, and a second boss portion 243. The connecting portion 241 can be bonded to the side wall of the end cap 21 facing the electrode assembly 23 by means of adhesive bonding. The connecting portion 241 has a through hole 2411 communicating with the explosion-proof valve 211. The first boss portion 242 is disposed at two opposite ends of the connecting portion 241 along the length direction Y of the end cap 21. The first boss portion 242 includes a first planar segment 2421 and a first ramp segment 2422 integrally formed on opposite sides of the first planar segment 2421 in the width direction X of the end cap 21. The thickness of the side of the first ramp segment 2422 facing away from the first planar segment 2421 is less than the thickness of the side of the first ramp segment 2422 connected to the first planar segment 2421.

[0205] The surface of the first ramp segment 2422 facing the electrode assembly 23 is flat. An angle G is formed between the surface of the first ramp segment 2422 facing the electrode assembly 23 and the surface of the first flat segment 2421 facing the electrode assembly 23, where 140°≤G≤175°. A first chamfer 2422a is provided between the surface of the first ramp segment 2422 facing the electrode assembly 23 and the surface of the first ramp segment 2422 facing away from the first flat segment 2421 in the width direction X. A second chamfer 2422b is provided between the surface of the first ramp segment 2422 facing the electrode assembly 23 and the surface of the first flat segment 2421 facing the electrode assembly 23. The first ramp section 2422 is recessed inward on the side opposite to the electrode assembly 23 to form multiple first grooves 2422c1. The multiple first grooves 2422c1 are distributed at intervals along the length Y of the end cap 21. The first reinforcing structure 2422c includes multiple first reinforcing ribs 2422c2 formed between adjacent first grooves 2422c1. The first planar section 2421 is recessed inward on the side opposite to the electrode assembly 23 to form multiple second grooves 2421a1. The multiple second grooves 2421a1 are distributed at intervals along the length Y of the end cap 21. The second reinforcing structure 2421a includes multiple second reinforcing ribs 2421a2 formed between adjacent second grooves 2421a1.

[0206] The second boss portion 243 is disposed on the side surface of the connecting portion 241 facing the electrode assembly 23 and covers the through hole 2411; the second boss portion 243 includes a second planar segment 2431 and second ramp segments 2432 disposed on opposite sides of the second planar segment 2431 in the width direction X of the end cap 21, the thickness of the side of the second ramp segment 2432 facing away from the second planar segment 2431 is less than the thickness of the side of the second ramp segment 2432 connected to the second planar segment 2431; a clearance hole 24311 is provided on the second planar segment 2431, and the clearance hole 24311 communicates with the through hole 2411.

[0207] Please refer to Figure 2 and Figure 3 Secondly, embodiments of this application also provide a battery device 100, including a battery cell 20 as described above.

[0208] The battery device 100 provided in this application embodiment includes the aforementioned battery cell 20. When the battery cell 20 bulges, the probability of the electrode assembly 23 being punctured is lower, and the stability of the battery device 100 is better.

[0209] Please refer to Figures 1 to 3 Thirdly, embodiments of this application also provide an electrical device, including a battery cell 20 as described above, or a battery device 100 as described above, wherein the battery cell 20 or the battery device 100 is used to provide electrical energy.

[0210] The electrical device provided in this application embodiment is, for example, the vehicle 1000 described above. The electrical device includes the battery cell 20 or the battery device 100 described above. Therefore, the stability of the electrical device is also better.

[0211] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A single battery cell, characterized in that: include A housing having an opening for receiving cavity; An electrode assembly, wherein the electrode assembly is housed within the receiving cavity; as well as An end cap is provided to cover the opening, and an insulating member is provided on the side of the end cap facing the electrode assembly. The insulating member includes a connecting portion and a first protrusion portion. The connecting portion is connected to the wall surface of the end cap facing the electrode assembly, and the first protrusion portion is provided on the connecting portion. The first boss portion includes a first planar segment and a first ramp segment disposed on at least one side of the first planar segment in the width direction of the end cap, wherein the thickness of the first ramp segment on the side opposite to the first planar segment is less than the thickness of the first ramp segment connected to the first planar segment.

2. The battery cell according to claim 1, characterized in that: The surface of the first ramp section facing the electrode assembly is a plane; or, the surface of the first ramp section facing the electrode assembly is an arc surface.

3. The battery cell according to claim 1, characterized in that: The first ramp section and the first planar section are integrally formed on the connecting part.

4. The battery cell according to claim 1, characterized in that: The first ramp segment is fixedly connected to the first plane segment, and the first ramp segment and the first plane segment are fixedly connected to the connecting part.

5. The battery cell according to any one of claims 1 to 4, characterized in that: A first chamfer is provided between the side surface of the first ramp segment facing the electrode assembly and the side surface of the first ramp segment facing away from the first planar segment in the width direction; And / or, a second chamfer is provided between the side surface of the first ramp segment facing the electrode assembly and the side surface of the first planar segment facing the electrode assembly.

6. The battery cell according to claim 5, characterized in that: The first chamfer is a rounded corner structure; and / or, the second chamfer is a rounded corner structure.

7. The battery cell according to claim 6, characterized in that: The fillet radius of the first chamfer is R1, R1≥1mm; and / or, the fillet radius of the second chamfer is R2, R2≥1mm.

8. The battery cell according to any one of claims 1 to 4, characterized in that: At least a portion of the first slope section is a first heat-resistant section, the melting point of which is greater than the melting point of the first planar section.

9. The battery cell according to claim 8, characterized in that: At least a portion of the first planar segment is a second heat-resistant portion, and the melting point of the first heat-resistant portion is greater than or equal to the melting point of the second heat-resistant portion.

10. The battery cell according to any one of claims 1 to 4, characterized in that: A first reinforcing structure is provided on the first slope section, and the first reinforcing structure is located on the side of the first slope section opposite to the electrode assembly.

11. The battery cell according to claim 10, characterized in that: The first slope section is recessed inward on the side opposite to the electrode assembly to form a plurality of first grooves. The plurality of first grooves are distributed in a spaced manner along the length direction of the end cap. The first reinforcing structure includes a plurality of first reinforcing ribs formed between adjacent first grooves.

12. The battery cell according to claim 11, characterized in that: A second reinforcing structure is provided on the first planar segment, and the second reinforcing structure is provided on the side of the first planar segment opposite to the electrode assembly.

13. The battery cell according to claim 12, characterized in that: The first planar segment is recessed inward on the side opposite to the electrode assembly to form a plurality of second grooves. The plurality of second grooves are distributed in a spaced manner along the length direction of the end cap. The second reinforcing structure includes a plurality of second reinforcing ribs formed between adjacent second grooves.

14. The battery cell according to claim 13, characterized in that: Along the length of the end cap, the distance between two adjacent first reinforcing ribs is less than or equal to the distance between two adjacent second reinforcing ribs.

15. The battery cell according to claim 13 or 14, characterized in that: The base thickness of the first planar segment is E, and the base thickness of the connecting part is F, wherein E > F.

16. The battery cell according to any one of claims 1 to 4, characterized in that: In the width direction, the width of the first ramp segment is M, and the width of the first planar segment is N, where 0.2≤M / N≤2.

17. The battery cell according to claim 16, characterized in that: 0.5≤M / N≤1.

5.

18. The battery cell according to claim 16, characterized in that: N≥5mm.

19. The battery cell according to any one of claims 1 to 4, characterized in that: An angle G is formed between the surface of the first ramp segment facing the electrode assembly and the surface of the first planar segment facing the electrode assembly, where 140°≤G≤175°.

20. The battery cell according to claim 19, characterized in that: 150°≤G≤170°。 21. The battery cell according to any one of claims 1 to 4, characterized in that: An explosion-proof valve is provided on the end cap, and a through hole is provided on the connecting part, the through hole being connected to the explosion-proof valve; The insulating component further includes a second boss portion, which is disposed on the side surface of the connecting portion facing the electrode assembly and covers the through hole; the second boss portion includes a second planar segment and a second ramp segment disposed on at least one side of the second planar segment in the width direction of the end cap, the thickness of the second ramp segment on the side away from the second planar segment is less than the thickness of the second ramp segment on the side connected to the second planar segment; a clearance hole is provided on the second planar segment, and the clearance hole communicates with the through hole.

22. A battery device, characterized in that: Includes the battery cell as described in any one of claims 1 to 21.

23. An electrical appliance, characterized in that: It includes a battery cell as described in any one of claims 1 to 21, or a battery device as described in claim 22, wherein the battery cell or the battery device is used to provide electrical energy.

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