Battery cell, battery device and electric device

Abstract

The utility model discloses a battery monomer, battery device and power utilization device, the battery monomer comprises a shell component, a pole component and an electrode component, the shell component comprises a first wall, the first wall is provided with a mounting hole, the first wall is bent to form a protruding structure, and the protruding structure is annularly arranged around the mounting hole; the pole assembly is installed in the installation hole and comprises a pole body, a first clamping piece, a second clamping piece and an insulation sealing structure, the first clamping piece is arranged on the side, away from the shell assembly, of the second clamping piece, and the first clamping piece and the second clamping piece clamp the pole body through the insulation sealing structure; a part of the second clamping piece is bent towards one side close to the insulation sealing structure; the electrode assembly is arranged in the shell assembly and electrically connected with the pole body. According to the utility model, the structural strength of the pole assembly and the compression amount of the insulation sealing structure can be improved, so that the reliability of the single battery is improved.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Typically, a battery device consists of a casing and multiple battery cells housed within it. Currently, the reliability of individual battery cells needs further improvement. Utility Model Content

[0003] This application provides a battery cell, a battery device, and an electrical device that can improve the insufficient compression of the insulation and sealing structure of the terminal assembly and the problem of the terminal assembly detaching from the housing assembly, thereby improving the reliability of the battery cell and the battery device.

[0004] In a first aspect, embodiments of this application provide a battery cell, including: a housing assembly, a terminal assembly, and an electrode assembly. The housing assembly includes a first wall with a mounting hole, and a protruding structure is formed by bending on the first wall, the protruding structure surrounding the mounting hole. The terminal assembly is mounted in the mounting hole and includes a terminal body, a first clamping member, a second clamping member, and an insulating sealing structure. The first clamping member is located on the side of the second clamping member away from the housing assembly. The first clamping member and the second clamping member clamp the terminal body through the insulating sealing structure, and a portion of the second clamping member is bent toward the side closer to the insulating sealing structure. The electrode assembly is disposed inside the housing assembly and is electrically connected to the terminal body.

[0005] In the above technical solution, the protruding structure surrounding the mounting hole on the first wall can improve the structural strength and rigidity of the first wall. This reduces the risk of significant deformation of the first wall when the electrode body is under high stress, thereby reducing the risk of the electrode body detaching from the first wall and improving the reliability of the battery cell. The second clamping part is bent towards the side closer to the insulating sealing structure, allowing for a tighter fit to the electrode body and further enhancing the clamping force. This structure also increases the compression of the insulating sealing structure, thereby enhancing its insulation and sealing effect on the electrode body and further improving the reliability of the battery cell.

[0006] In some embodiments of this application, the protruding structure has a transition fillet on the side of the first wall away from the electrode assembly.

[0007] In the above technical solution, the rounded corners of the protruding structure make the first wall smoother, reducing stress concentration at right angles or sharp edges and preventing the first wall from breaking at the protruding structure. Furthermore, rounded corners are easier to process and shape than sharp edges.

[0008] In some embodiments of this application, the transition fillet includes a first fillet and a second fillet connected together, wherein the radius of the second fillet is greater than the radius of the first fillet.

[0009] In the above technical solution, the use of two rounded corners of different sizes allows for both strength enhancement of the protruding structure and ease of manufacturing, improving manufacturability and product yield. Furthermore, the smaller radius of the first rounded corner preferentially disperses some stress near the connection between the protruding structure and the first wall, initially alleviating stress concentration. The larger radius of the second rounded corner further disperses stress over a wider area, resulting in a more uniform stress distribution, effectively reducing the risk of cracks or damage to the first wall, and improving the structural reliability of the battery cell under external impact or internal pressure changes.

[0010] In some embodiments of this application, the radius of the first fillet is R1, where R1 ≥ 0.5 mm. In the above technical solution, the radius of the first fillet within a reasonable range can effectively disperse the stress at the first fillet, thereby enhancing the stiffness of the first wall, effectively reducing the risk of cracks or damage to the first wall, and also improving manufacturability, increasing product yield, and reducing costs.

[0011] In some embodiments of this application, the radius of the second fillet is R2, where R2 ≥ 1.5 mm. In the above technical solution, the radius of the second fillet is large enough to allow stress to be distributed more evenly at the second fillet, avoiding material fatigue and crack propagation caused by stress concentration, thereby significantly enhancing the structural strength and durability of the first wall, extending the service life of the battery cell, improving manufacturability, increasing product yield, and reducing costs.

[0012] In some embodiments of this application, the protrusion height of the protruding structure in the thickness direction of the first wall is H, where 1mm ≤ H ≤ 2mm. In the above technical solution, a reasonable protrusion height can effectively disperse the stress generated by external impact, vibration or internal stress on the battery cell, prevent the first wall from deforming or cracking at the mounting hole, ensure the stability and reliability of the battery cell structure, and improve the energy density of the battery cell while increasing the structural strength and rigidity of the first wall.

[0013] In some embodiments of this application, the first wall includes an inner ring portion and an outer ring portion connected together, with a protruding structure formed between the inner ring portion and the outer ring portion. The inner ring portion is provided with a mounting hole, and in the direction of the first clamping member pointing towards the pole body, the size of the outer ring portion is larger than the size of the inner ring portion.

[0014] In the above technical solution, the outer ring portion is larger than the inner ring portion, which makes the protruding structure closer to the electrode assembly. The position of the first wall near the electrode assembly has higher structural strength and rigidity, so that the first wall can better resist deformation when the electrode body is subjected to force, which is more conducive to reducing the risk of large deformation of the first wall, thereby reducing the probability of the electrode body detaching from the first wall and improving the reliability of the battery cell.

[0015] In some embodiments of this application, the inner ring portion protrudes outward relative to the outer ring portion toward the outer side of the housing assembly.

[0016] In the above technical solution, the inner ring adopts a more protruding design, which can increase the height of the pole assembly relative to the first wall, and the space around the pole body is larger, with less interference, which is conducive to the connection between the pole body and other components, thereby improving the reliability and convenience of the connection between the pole assembly and external components.

[0017] In some embodiments of this application, the outer ring portion protrudes outward relative to the inner ring portion toward the outer side of the housing assembly.

[0018] In the above technical solution, the inner ring portion has a lower height than the outer ring portion, which reduces the protrusion height of the electrode assembly relative to the first wall. This results in a more compact overall structure for the battery cell, which is beneficial for increasing the energy density of the battery cell. Furthermore, when multiple battery cells are assembled into a battery device, this method helps reduce the dimensions of the battery device in the third dimension, further improving the energy density of the battery device.

[0019] In some embodiments of this application, the housing assembly includes a housing and a cover plate, one end of the housing is formed with an opening, the cover plate is disposed on the opening, and a first wall is disposed on the housing or the cover plate.

[0020] In the above technical solution, the outer casing and cover plate together form a relatively enclosed space, which can effectively protect the internal components of the battery cell from external physical impacts, dust, moisture, and corrosive substances, reducing the risk of damage to internal components, extending the service life of the battery cell, and thus ensuring the stability and reliability of the battery cell's performance. This solution also provides more options for the installation of the terminal block assembly, thereby expanding the structural forms of the battery cell and helping to meet different design requirements.

[0021] In some embodiments of this application, the second clamping member includes a first part and a second part. The first part is connected to the first clamping member, and the second part clamps the pole body with the first clamping member through an insulating and sealing structure. In the thickness direction of the first wall, the thickness of the first part is greater than the thickness of the second part.

[0022] In the above technical solution, the first clamping member and the second clamping member constitute a connection structure connecting the electrode post body and the housing assembly. By setting the second clamping member to include a first part and a second part, the first part is connected to the first clamping member, and the second part clamps the electrode post body with the first clamping member through an insulating and sealing structure. In the thickness direction of the first wall, the thickness of the first part is greater than the thickness of the second part, and the second part is bent relative to the first part towards the side closer to the insulating and sealing structure. This can improve the structural strength and rigidity of the second clamping member, improve the connection reliability between the electrode post body and the first wall, reduce the risk of the electrode post body detaching from the housing assembly under force, and thus improve the reliability of the battery cell.

[0023] In some embodiments of this application, the second portion is bent relative to the first portion toward the side closer to the insulating sealing structure.

[0024] In the above technical solution, the bending structure of the second part increases the structural complexity of the second clamping component to a certain extent, thereby improving the structural strength and rigidity. This enables the second clamping component to better maintain its shape and position when subjected to clamping force and external force, reducing the possibility of deformation, and thus improving the structural stability and reliability of the entire battery cell.

[0025] In some embodiments of this application, the first clamping member includes a first material layer and a second material layer connected together. The second material layer is disposed on the side of the first material layer near the second clamping member and has a strength greater than that of the first material layer.

[0026] In the above technical solution, by setting the first clamping member into the above structure, the second material layer can be used as a reinforcing material to improve the overall structural strength and rigidity of the first clamping member, thereby improving the effect of the first clamping member to withstand greater forces, reducing the risk of deformation of the first clamping member, and thus reducing the risk of the pole body and the first clamping member becoming loose, thereby improving the overall reliability of the pole assembly.

[0027] In some embodiments of this application, the first material layer and the first wall are made of the same material. In the above technical solution, setting the first material layer and the first wall to be of the same material facilitates the connection between the first material layer and the first wall.

[0028] In some embodiments of this application, the first material layer and the first wall are made of aluminum, and the second material layer is made of stainless steel. In the above technical solution, using aluminum for the first material layer and the first wall reduces material costs, while using stainless steel for the second material layer reduces material costs while providing good reinforcement.

[0029] In some embodiments of this application, the second clamping member includes a third material layer and a fourth material layer connected together. The fourth material layer is disposed on the side of the third material layer near the first clamping member and has a strength greater than that of the third material layer.

[0030] In the above technical solution, by setting the second clamping member into the above structure, the fourth material layer can be used as a reinforcing material to improve the overall structural strength and rigidity of the second clamping member, thereby improving the effect of the second clamping member to withstand greater forces, reducing the risk of deformation of the second clamping member, and thus reducing the risk of the pole body and the second clamping member becoming loose, thereby improving the overall reliability of the pole assembly.

[0031] In some embodiments of this application, the insulating sealing structure includes a seal and a first insulating member, the seal being disposed between the pole body and the second clamping member, and the first insulating member being disposed between the pole body and the first clamping member.

[0032] In the above technical solution, the sealing element improves the sealing performance between the terminal body and the second clamping element, reducing the risk of electrolyte leakage inside the housing assembly and decreasing the probability of external moisture, dust, and other particulate matter entering the housing assembly, thus improving the reliability of the battery cell. The first insulating element provides an insulated connection between the first clamping element and the terminal body, reducing the risk of short circuits between them. It also provides a certain degree of sealing between the first clamping element and the terminal body, enhancing the sealing performance and thereby improving the reliability of the terminal assembly, and consequently, the reliability of the battery cell.

[0033] In some embodiments of this application, the insulating sealing structure includes a second insulating member disposed on the outer side of the first clamping member away from the pole body and connected to the first insulating member.

[0034] In the above technical solution, the second insulating component connects to the first insulating component and covers the outer surface of the first clamping component away from the terminal body, further expanding the insulation area and forming a more comprehensive insulating protective layer. This not only prevents leakage between the terminal body and the first clamping component but also avoids potential electrical conduction between the outer surface of the first clamping component and other surrounding components, effectively improving the insulation performance of the battery cell, reducing the risk of leakage, and increasing the reliability of the battery cell. The connection between the second and first insulating components also forms a continuous insulating barrier and increases the insulation boundary, enhancing the insulation performance between the terminal body and the first clamping component, thereby improving the reliability of the terminal assembly and ultimately the reliability of the battery cell.

[0035] In some embodiments of this application, the first insulating member and the second insulating member are integrally formed. This integrally formed structural design helps reduce the number of parts, thereby reducing assembly steps, simplifying the production process, and lowering manufacturing costs.

[0036] In some embodiments of this application, the insulating sealing structure includes a third insulating member disposed on the side of the second clamping member near the electrode assembly, and the third insulating member abuts against the sealing member.

[0037] In the above technical solution, the third insulating component is disposed on the side of the second clamping component near the electrode assembly, further expanding the insulation area and effectively isolating the electrical connection between the electrode assembly and the second clamping component. The third insulating component abuts against the sealing component, forming a more complete insulation barrier, preventing current leakage to the second clamping component, avoiding potential short circuits and leakage risks, and improving the reliability of the battery cell.

[0038] In some embodiments of this application, the battery cell includes an insulating component disposed inside the first wall and abutting or connecting to a third insulating component. In the above technical solution, the insulating component is installed inside the first wall and connected to or abutting the third insulating component, providing additional support for internal structures such as the terminal assembly and electrode assembly. The abutting or connection between the insulating component and the third insulating component forms a more complete and continuous insulation system, thereby expanding the insulation range and reducing the risk of short circuits caused by electrical contact between the electrode assembly and the first wall.

[0039] In some embodiments of this application, the protruding structure is replaced by being disposed on the second clamping member, with the protruding structure arranged annularly around the mounting hole. In the above technical solution, the protruding structure can strengthen the second clamping member, improve its structural strength and rigidity, and thus better withstand the force from the electrode body, reducing the risk of large deformation of the second clamping member. This also reduces the probability of the electrode body detaching from the first and second clamping members, and reduces the probability of insufficient compression in the insulation sealing structure, thereby improving the reliability of the electrode assembly and the battery cell.

[0040] In some embodiments of this application, the second clamping member includes an outer ring structure and an inner ring structure, with a protruding structure formed between the outer ring portion and the inner ring portion. The outer ring portion is insulated and sealed to the mounting hole, and the inner ring portion is connected to the outer ring structure. In the direction from the first clamping member to the pole body, the size of the outer ring structure is smaller than the size of the inner ring structure.

[0041] In the above technical solution, the size of the outer ring structure is smaller than that of the inner ring structure. This allows the protruding structure to be as far away from the first clamping member as possible while ensuring that the second clamping member has high structural strength and rigidity. This facilitates the connection between the first clamping member and the second clamping member and improves the reliability of the connection between the first clamping member and the second clamping member.

[0042] In some embodiments of this application, the inner ring structure protrudes outward relative to the outer ring structure toward the outer side of the housing assembly. In the above technical solution, the protruding inner ring structure provides more reliable support for the electrode assembly, reducing the possibility of loosening or displacement of the electrode assembly when the battery cell is subjected to external impacts or vibrations, ensuring the stability of the electrical connection between the electrode assembly and the electrode assembly, and guaranteeing normal battery operation.

[0043] In some embodiments of this application, the outer ring structure protrudes outward relative to the inner ring structure toward the outer side of the housing assembly. This protrusion of the outer ring serves as a reinforcing structure, dispersing internal pressure and external impact forces within the battery cell, enhancing the rigidity of the second clamping member, reducing the possibility of deformation, and improving the structural stability of the battery cell under various operating conditions. Simultaneously, it serves as a guide structure during installation, facilitating accurate insertion of the terminal post assembly into the mounting hole by the operator, reducing installation difficulty and improving assembly efficiency.

[0044] Secondly, embodiments of this application provide a battery device including a single battery cell as described above.

[0045] In the above technical solution, since the battery cell has high reliability, the battery device using the battery cell can have good reliability.

[0046] Thirdly, embodiments of this application provide an electrical device, including a single battery cell as described above, or a battery device as described above.

[0047] In the above technical solution, since the battery cell or battery device has high reliability, it is beneficial to improve the reliability of the electrical device that uses the battery cell or battery device. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 The electrical device provided in some embodiments of this application is a structural schematic diagram of a vehicle;

[0050] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0051] Figure 3 This is a schematic diagram of the internal structure of a battery cell provided in some embodiments of this application;

[0052] Figure 4 for Figure 3 A magnified view of part I;

[0053] Figure 5 Schematic diagrams of the internal structure of a battery cell provided in some embodiments of this application;

[0054] Figure 6 for Figure 5 A magnified view of section II;

[0055] Figure 7 This is a schematic diagram of the internal structure of a battery cell provided in other embodiments of this application;

[0056] Figure 8 for Figure 7 A schematic diagram of the first clamping component before and after molding in the embodiment;

[0057] Figure 9 for Figure 7 A schematic diagram of the second clamping member before and after molding in the embodiment;

[0058] Figure 10 for Figure 5 A magnified view of section III;

[0059] Figure 11 This is a schematic diagram of the internal structure of a battery cell provided in some embodiments of this application;

[0060] Figure 12 This is a schematic diagram of the assembly process of a battery cell provided in some embodiments of this application.

[0061] icon:

[0062] 1000. Electrical appliances;

[0063] 100. Battery device;

[0064] 10. Box body; 11. First box body; 12. Second box body;

[0065] 20. Battery cell;

[0066] 21. Housing assembly; 211. First wall; 211a. Mounting hole; 2112. Inner ring portion; 2113. Outer ring portion; 212. Outer shell; 212a. Opening; 213. Cover plate;

[0067] 22. Terminal assembly;

[0068] 221. Pole column body; 2206. First material part; 2207. Second material part;

[0069] 222, First clamping element; 2201, First material layer; 2202, Second material layer;

[0070] 223. Second clamping component; 2231. First part; 2232. Second part; 2233. Third part; 2203. Third material layer; 2204. Fourth material layer; 2235. Outer ring structure; 2236. Inner ring structure;

[0071] 224. Insulating and sealing structure; 2241. Sealing element; 2242. First insulating element; 2243. Second insulating element; 2244. Third insulating element;

[0072] 23. Electrode assembly; 231. Electrode tab;

[0073] 24. Insulating components;

[0074] 25. Protruding structure; 251. Transition fillet; 252. First fillet; 253. Second fillet;

[0075] 200, controller; 300, motor; X, first direction; Z, third direction. Detailed Implementation

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] In this application, "multiple" means two or more (including two).

[0083] In this application, the battery cell may include lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, and the embodiments of this application are not limited to these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0084] The battery apparatus mentioned in the embodiments of this application can refer to an assembly of one or more battery cells for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar. In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0085] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0086] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing. As an example, the individual battery cell assembly may be a battery module, which can be housed within the housing by securing the battery module to the housing. Alternatively, the individual battery cell assembly may be housed within the housing by directly securing multiple individual battery cells to the housing. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the individual battery cells.

[0087] A single battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, while the uncoated positive current collector protrudes beyond the coated one, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the one with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0088] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0089] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Typically, a battery device consists of a casing and multiple battery cells housed within it. Currently, the reliability of individual battery cells needs further improvement.

[0090] In a typical battery cell, the terminal assembly usually includes the terminal body, which is mounted to the casing via riveting, welding, or other methods. However, as the battery cell operates under prolonged charging and discharging, the internal gas pressure increases, creating an outward pulling force on the terminal body, posing a risk of the terminal body detaching from the casing. Secondly, the terminal body is usually welded to external conductive components (such as electrodes). During use, under the influence of these conductive components, the terminal body is also subjected to an outward pulling force, again posing a risk of detachment from the casing. In other words, the terminal body is at risk of detaching from the casing due to significant stress during use, thus affecting the reliability of the battery cell. Insufficient strength of the connection structure between the terminal body and the casing is one contributing factor to this problem. Furthermore, the periphery of the terminal body is typically sealed using a sealing structure, usually located between the upper or lower surface of the casing wall and the terminal body. Pre-applied pressure is used to compress the sealing structure between the terminal body and the casing wall to ensure sufficient compression. However, when the applied pre-force is removed and the electrode body becomes loose relative to the shell wall during subsequent use, the compression of the sealing structure will gradually decrease. Moreover, as analyzed above, the deformation of the connection structure between the electrode body and the shell can also easily cause a decrease in the compression of the sealing structure. All of the above factors will affect the sealing performance of the electrode body and the reliability of the battery cell.

[0091] Based on the above considerations, in order to address the risk that the terminal body of a battery cell may detach from the outer casing due to excessive force, thereby affecting the reliability of the battery cell, the applicant has designed a battery cell comprising: a housing assembly, a terminal assembly, and an electrode assembly. The housing assembly includes a first wall with a mounting hole, and a protruding structure formed by bending on the first wall, the protruding structure being arranged around the mounting hole. The terminal assembly is mounted in the mounting hole and includes a terminal body, a first clamping member, a second clamping member, and an insulating sealing structure. The first clamping member is located on the side of the second clamping member away from the housing assembly. The first clamping member and the second clamping member clamp the terminal body through the insulating sealing structure, and a portion of the second clamping member is bent towards the side closer to the insulating sealing structure. The electrode assembly is located inside the housing assembly and is electrically connected to the terminal body.

[0092] In this battery cell structure, the protruding structure surrounding the mounting hole on the first wall improves the structural strength and rigidity of the first wall. This reduces the risk of significant deformation of the first wall when the electrode body is under high stress, thus lowering the risk of the electrode body detaching from the first wall and improving the reliability of the battery cell. The second clamping part is bent towards the side closer to the insulating sealing structure, allowing for a tighter fit to the electrode body and further enhancing the clamping force. This structure also increases the compression of the insulating sealing structure, thereby enhancing its insulation and sealing effect on the electrode body and further improving the reliability of the battery cell.

[0093] The battery cells or battery devices disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and battery devices disclosed in this application can be used to construct such an electrical device, thus expanding the applicability of the battery cells and battery devices.

[0094] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0095] For ease of explanation, the following embodiments use a vehicle as an example to illustrate an electrical device 1000 according to an embodiment of this application. Please refer to... Figure 1 , Figure 1The electrical device 1000 provided in some embodiments of this application is a structural schematic diagram of a vehicle. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle, and the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0096] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0097] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a plurality of battery cells 20, which are housed within the housing 10. The housing 10 provides assembly space for the battery cells 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cells 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as cylinder, cuboid, etc.

[0098] In the battery device 100, multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0099] Please refer to Figure 2 , Figure 2 The following is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes multiple rows of battery cells 20, which are arranged along the length of the housing 10. Each row of battery cells 20 includes a plurality of battery cells 20 arranged along the width of the housing 10; or, the multiple rows of battery cells 20 are arranged along the width of the housing 10, and each row of battery cells 20 includes a plurality of battery cells 20 arranged along the length of the housing 10.

[0100] Each battery cell 20 can be a secondary battery or a primary battery. A secondary battery refers to a battery cell 20 that can be recharged after discharge to activate its active materials and continue to be used. It can also 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 this application embodiment is not limited in this regard. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes. For example, in... Figure 2 In the middle, the shape of the battery cell 20 is a cuboid.

[0101] Reference Figure 3 and Figure 5This application provides a battery cell 20, including: a housing assembly 21, a terminal assembly 22, and an electrode assembly 23. The housing assembly 21 includes a first wall 211 with a mounting hole 211a. A protruding structure 25 is formed by bending on the first wall 211 and surrounds the mounting hole 211a. The terminal assembly 22 is mounted in the mounting hole 211a and includes a terminal body 221, a first clamping member 222, a second clamping member 223, and an insulating sealing structure 224. The first clamping member 222 is located on the side of the second clamping member 223 away from the housing assembly 21. The first clamping member 222 and the second clamping member 223 clamp the terminal body 221 through the insulating sealing structure 224, and a portion of the second clamping member 223 is bent toward the side closer to the insulating sealing structure 224. The electrode assembly 23 is disposed inside the housing assembly 21 and is electrically connected to the terminal body 221.

[0102] The housing assembly 21 can refer to the structure used to house and protect the internal components of the battery cell 20. The shape of the housing assembly 21 can be, but is not limited to, a cuboid, a cube, a cylinder, etc., and the material can be, but is not limited to, metal materials (such as aluminum, stainless steel, etc.), plastic materials (such as polypropylene, polyamide, polyphenylene sulfide, etc.), composite materials (such as carbon fiber reinforced composite materials, aluminum-plastic film, etc.), or other materials resistant to electrolyte corrosion, etc.

[0103] The first wall 211 can refer to a shell wall among the multiple shell walls that enclose the housing assembly 21, which has mounting holes 211a. For example, the housing assembly 21 can have a first direction X, a second direction, and a third direction Z, wherein the second direction can refer to a direction perpendicular to the first direction X and the third direction Z. For example, the first direction X is the width direction of the battery cell 20, the second direction is the length direction of the battery cell 20, and the third direction Z is the height direction of the battery cell 20. For ease of understanding, the first wall 211 can be, but is not limited to, one of the upper shell wall, the lower shell wall, or one of the four surrounding side shell walls of the housing assembly 21, etc. For example, referring to Figure 3 The upper shell wall parallel to the first direction X is provided with mounting holes 211a, and this shell wall can be used as the first wall 211.

[0104] The protruding structure 25 can strengthen the first wall 211, improve the structural strength and rigidity of the first wall 211, and better withstand the force from the electrode body 221, reducing the risk of deformation of the first wall 211. This reduces the risk of the first wall 211 deforming and coming off when the electrode body 221 is under force, thereby improving the reliability of the battery cell 20.

[0105] The explanation of electrode assembly 23 can be found above, and will not be repeated here.

[0106] The terminal assembly 22 can refer to the component in the battery cell 20 that connects the internal electrode components and the external circuitry. The terminal body 221 can be a conductor, and its material can be, but is not limited to, metallic materials, such as copper or aluminum. The first clamping member 222 can refer to a structure or component that fixes the terminal body 221 through an insulating sealing structure 224. The second clamping member 223 can refer to a structure or component that fixes the terminal body 221 through an insulating sealing structure 224. The first clamping member 222 and the second clamping member 223 together form a clamping groove for clamping the terminal body 221. The first clamping member 222 and the second clamping member 223 can be made of metallic or non-metallic materials, and the first clamping member 222 and the second clamping member 223 can be connected by methods including but not limited to welding and bonding.

[0107] The connection method between the electrode post body 221 and the electrode assembly 23 can include, but is not limited to, ultrasonic welding, ultrasonic pre-welding + laser welding, resistance welding, pressure welding, brazing, or adhesive bonding. The electrode post assembly 22 in the above structure can be either the positive or negative electrode of the battery cell 20. The electrode post body 221 can be a component made of a single material (e.g., pure aluminum electrode post, pure copper electrode post, etc.) or a component made of composite materials (e.g., copper-aluminum composite electrode post).

[0108] The electrode body 221 is connected to the first wall 211 through the first clamping member 222 and the second clamping member 223. A portion of the electrode body 221 is disposed in the clamping groove formed by the first clamping member 222 and the second clamping member 223. With this structure, the first clamping member 222 and the second clamping member 223 can firmly fix the electrode body 221, reduce the probability of loosening between the electrode body 221 and the first wall 211, and improve the connection reliability between the electrode body 221 and the first wall 211. On the other hand, it can also provide clear positioning and guidance for the electrode body 221 during the assembly process of the battery cell 20, which is conducive to improving assembly efficiency and assembly accuracy. When the pole body 221 is subjected to a force moving away from the first wall 211, for example, if the internal air pressure of the housing assembly 21 is high and a pull force is applied to the pole body 221 towards the outside of the housing assembly 21, or if a pull force is formed by a conductive component (e.g., a bar) connected to the pole body 221, the first clamping member 222 can apply a constraint force to the pole body 221 in the opposite direction to the pull force. Since the second clamping member 223 is located inside the housing assembly 21, the connection position of the first clamping member 222 and the second clamping member 223 is also located on the side of the pole body 221 facing inward towards the housing assembly 21. The transmission path of the pull force on the pole body 221 will not pass through the connection position of the first clamping member 222 and the second clamping member 223 (this connection position can be connected by means including but not limited to welding, bonding, etc.). Therefore, when the pole body 221 is subjected to a pull force, the risk of a weak position in the structure formed by the first clamping member 222 and the second clamping member 223 is low, and the probability of breakage or large deformation is also low.

[0109] In the structure of the second clamping member 223, a portion of the second clamping member 223 is bent towards the side closer to the insulating sealing structure 224. This structure allows the second clamping member 223 to more directly increase the compression of the insulating sealing structure 224, improving the insulation and sealing reliability of the terminal assembly 22. When the force acting on the first clamping member 222 and the second clamping member 223 is removed during assembly, even if the compression of the insulating sealing structure 224 decreases due to slight deformation rebound of the first clamping member 222 and the second clamping member 223, the original compression of the insulating sealing structure 224 was still relatively large. This helps ensure that the actual compression of the insulating sealing structure 224 meets the design requirements, improving the insulation and sealing reliability of the terminal assembly 22. Therefore, the above structure improves the insulation and sealing performance of the terminal assembly 22, thereby improving the reliability of the battery cell 20.

[0110] It should be noted that in the above embodiments, the housing assembly 21, the first clamping member 222, the second clamping member 223, and the pole body 221 or other components can be formed by processes such as stamping, injection molding, and extrusion. These processes are mature, cost-effective, and have high structural strength.

[0111] In the above technical solution, the protruding structure 25 surrounding the mounting hole 211a on the first wall 211 can improve the structural strength and rigidity of the first wall 211. When the electrode body 221 is under great force, it can reduce the risk of large deformation of the first wall 211, thereby reducing the risk of the electrode body 221 detaching from the first wall 211 and improving the reliability of the battery cell 20. The second clamping member 223 is partially bent towards the side close to the insulating sealing structure 224, which can fit more tightly to the electrode body 221, further enhancing the clamping force on the electrode body 221. Moreover, this structure can also increase the compression of the insulating sealing structure 224, thereby enhancing the insulation and sealing effect of the insulating sealing structure 224 on the electrode body 221, and further improving the reliability of the battery cell 20.

[0112] In some embodiments of this application, reference is made to Figure 4 and Figure 6 The protruding structure 25 is located on the side of the first wall 211 away from the electrode assembly 23 and has a transition fillet 251. It can be understood that the protruding structure 25 is not a sharp edge, but an arc shape with a certain radius.

[0113] In the above technical solution, the protruding structure 25 has a transition rounded corner 251, which makes the first wall 211 smoother, reduces stress concentration at right angles or sharp corners, and prevents the first wall 211 from breaking at the protruding structure 25. At the same time, the rounded corner structure is easier to process and form than the sharp corner.

[0114] In some embodiments of this application, reference is made to Figure 4 and Figure 6 The transition fillet 251 includes a first fillet 252 and a second fillet 253 connected together, and the radius of the second fillet 253 is greater than the radius of the first fillet 252.

[0115] In the above technical solution, the use of two rounded corners of different sizes allows the protruding structure 25 to achieve a strength enhancement effect while facilitating manufacturing, thus improving manufacturability and product yield. On the other hand, the smaller radius first rounded corner 252 can preferentially disperse some stress near the connection between the protruding structure 25 and the first wall 211, initially alleviating stress concentration. The larger radius second rounded corner 253 can further disperse stress over a wider area, making the stress distribution more uniform, effectively reducing the risk of cracks or damage to the first wall 211, and improving the structural reliability of the battery cell 20 under external impact or internal pressure changes.

[0116] In some embodiments of this application, reference is made to Figure 4 and Figure 6The radius of the first fillet 252 is R1, where R1 ≥ 0.5 mm. The first fillet 252 can refer to a concave fillet, where R1 can be, but is not limited to, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, etc.

[0117] If R1 is less than 0.5mm, it cannot effectively disperse the stress at the first fillet 252. At the same time, it will make the first fillet 252 more difficult to manufacture and form during the mold process, requiring higher processing equipment and processes, and making it easy to encounter situations where processing accuracy is difficult to guarantee.

[0118] In the above technical solution, the radius of the first fillet 252 can effectively disperse the stress at the first fillet 252 within a reasonable range, thereby enhancing the rigidity of the first wall 211, effectively reducing the risk of cracks or damage to the first wall 211, and also improving manufacturability, increasing product yield, and reducing costs.

[0119] In some embodiments of this application, reference is made to Figure 4 and Figure 6 The radius of the second fillet 253 is R2, where R2 ≥ 1.5 mm. The second fillet 253 can refer to a convex fillet, where R2 can be, but is not limited to, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, etc.

[0120] If R2 is less than 1.5mm, when the battery cell 20 is subjected to external impact, vibration or internal pressure change, the stress will be transmitted along the protruding structure 25 and the first wall 211. The stress will be concentrated at the second rounded corner 253, causing the first wall 211 to break. At the same time, since the second rounded corner 253 is convex, R2 being less than 1.5mm will also increase the manufacturing difficulty, reduce the product yield, and be detrimental to reducing manufacturing costs.

[0121] In the above technical solution, the radius of the second fillet 253 is large enough to allow the stress to be distributed more evenly in the second fillet 253, avoid material fatigue and crack propagation caused by stress concentration, enhance the structural strength and durability of the first wall 211, extend the service life of the battery cell 20, improve manufacturability, increase product yield, and reduce costs.

[0122] In some embodiments of this application, reference is made to Figure 4 and Figure 6 In the thickness direction of the first wall 211, the protrusion height of the protruding structure 25 is H, where 1mm≤H≤2mm.

[0123] H can be, but is not limited to, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, etc. If H is less than 1mm, the protrusion height of the protrusion structure 25 is small, and the strength enhancement effect is not good. If H is greater than 2mm, the strength enhancement effect of the protrusion structure 25 is excessive, and the height of the protrusion structure 25 is large, occupying a large volume, which increases the overall volume and size of the battery cell 20, and is not conducive to improving the energy density of the battery cell 20.

[0124] In the above technical solution, the reasonable protrusion height can effectively disperse the stress generated by external impact, vibration or internal stress on the battery cell 20, prevent the first wall 211 from deforming or cracking at the mounting hole 211a, ensure the stability and reliability of the battery cell 20, and improve the energy density of the battery cell 20 while improving the structural strength and rigidity of the first wall 211.

[0125] In some embodiments of this application, reference is made to Figures 3 to 6 The first wall 211 includes an inner ring portion 2112 and an outer ring portion 2113 connected together. A protruding structure 25 is formed between the inner ring portion 2112 and the outer ring portion 2113. The inner ring portion 2112 is provided with a mounting hole 211a. In the direction from the first clamping member 222 to the pole body 221, the size of the outer ring portion 2113 is larger than the size of the inner ring portion 2112.

[0126] The inner ring portion 2112 can refer to the annular portion of the first wall 211 close to the pole body 221, and the outer ring portion 2113 can refer to the annular portion of the first wall 211 away from the pole body 221.

[0127] "The direction in which the first clamping member 222 points toward the pole body 221" can be referenced. Figure 3 The first direction is X.

[0128] In the above technical solution, the outer ring portion 2113 is larger than the inner ring portion 2112, which makes the protruding structure 25 closer to the electrode assembly 22. The position of the first wall 211 near the electrode assembly 22 has higher structural strength and rigidity, so that the first wall 211 can better resist deformation when the electrode body 221 is subjected to force, which is more conducive to reducing the risk of large deformation of the first wall 211, thereby reducing the probability of the electrode body 221 detaching from the first wall 211 and improving the reliability of the battery cell 20.

[0129] In some embodiments of this application, reference is made to Figure 3 and Figure 4The inner ring portion 2112 protrudes outward relative to the outer ring portion 2113 toward the outer side of the housing assembly 21. It is understood that, referring to... Figure 3 On the third direction Z, the highest height of the inner ring 2112 is greater than the highest height of the outer ring 2113.

[0130] In the above technical solution, the inner ring portion 2112 adopts a more protruding design, which can increase the height of the pole assembly 22 relative to the first wall 211. The space around the pole body 221 is larger and there is less interference, which is conducive to the connection of the pole body 221 and other components (such as the bar, busbar, etc.), thereby improving the reliability and convenience of the connection between the pole assembly 22 and external components.

[0131] In some embodiments of this application, reference is made to Figure 5 and Figure 6 The outer ring portion 2113 protrudes outward relative to the inner ring portion 2112 toward the outer side of the housing assembly 21. It is understood that, referring to... Figure 4 On the third direction Z, the highest height of the outer ring 2113 is greater than the highest height of the inner ring 2112.

[0132] In the above technical solution, the inner ring portion 2112 has a lower height than the outer ring portion 2113, which reduces the protrusion height of the electrode assembly 22 relative to the first wall 211. This results in a more compact overall structure for the battery cell 20, which is beneficial for improving the energy density of the battery cell 20. Furthermore, when multiple battery cells 20 are assembled into a battery device 100, this method helps reduce the dimensions of the battery device 100 in the third direction Z, thereby improving the energy density of the battery device 100.

[0133] In some embodiments of this application, reference is made to Figure 3 and Figure 5 The housing assembly 21 includes a housing 212 and a cover plate 213. One end of the housing 212 has an opening 212a, and the cover plate 213 covers the opening 212a. A first wall 211 is provided on the housing 212 or the cover plate 213.

[0134] The outer shell 212 can refer to an assembly consisting of multiple shell walls surrounding a bottom wall. The cover plate 213 can close the plate of the outer shell 212. It is understood that in the shell assembly 21, the first wall 211 can be provided on the cover plate 213 or on any shell wall of the outer shell 212.

[0135] In the above technical solution, the outer casing 212 and the cover plate 213 together form a relatively enclosed space, which can effectively protect the internal components of the battery cell 20 from external physical impacts, dust, moisture, and corrosive substances, reduce the risk of damage to internal components, extend the service life of the battery cell 20, and thus ensure the stability and reliability of the battery cell 20's performance. This solution also provides more options for the installation of the terminal assembly 22, thereby expanding the structural forms of the battery cell 20 and helping to meet different design requirements.

[0136] In some embodiments of this application, reference is made to Figure 3 , Figure 5 and Figure 10 The second clamping member 223 includes a first part 2231 and a second part 2232. The first part 2231 is connected to the first clamping member 222. The second part 2232 and the first clamping member 222 are clamped together by an insulating sealing structure 224 to clamp the pole body 221. In the thickness direction of the first wall 211, the thickness of the first part 2231 is greater than the thickness of the second part 2232.

[0137] Since the first part 2231 is the part connected to the second clamping member 222 and the first clamping member 223, the thickness of the first part 2231 is greater than the thickness of the second part 2232 in the thickness direction of the first wall 211. This makes the first part 2231 have a larger thickness and higher structural strength and rigidity. When the terminal body 221 is subjected to a force along the third direction Z, whether the force acts on the terminal body 221 from the outside of the housing assembly 21 or from the inside of the housing assembly 21, the first part 2231 can withstand a greater force when the force is transmitted to the second clamping member 223, reducing the risk of bending deformation. This effectively reduces the risk of the terminal body 221 detaching from the first wall 211 under stress. Furthermore, it reduces the risk of insufficient compression of the insulating sealing structure 224 due to deformation of the second clamping member 223, thereby improving the reliability of the terminal assembly 22 and consequently the battery cell 20. Secondly, the above structure also allows for a reduction in the size and weight of the second clamping member 223 while maintaining high structural strength and rigidity, which is also beneficial for increasing the energy density of the battery cell 20.

[0138] In the above technical solution, the first clamping member 222 and the second clamping member 223 constitute a connection structure connecting the electrode body 221 and the housing assembly 21. By setting the second clamping member 223 to include a first part 2231 and a second part 2232, the first part 2231 is connected to the first clamping member 222, and the second part 2232 clamps the electrode body 221 with the first clamping member 222 through an insulating sealing structure 224. In the thickness direction of the first wall 211, the thickness of the first part 2231 is greater than the thickness of the second part 2232. The second part 2232 is bent relative to the first part 2231 towards the side closer to the insulating sealing structure 224. This can improve the structural strength and rigidity of the second clamping member 223, improve the connection reliability between the electrode body 221 and the first wall 211, reduce the risk of the electrode body 221 being dislodged from the housing assembly 21 under force, and thus improve the reliability of the battery cell 20.

[0139] In some embodiments of this application, reference is made to Figure 3 , Figure 5 and Figure 10 The second part 2232 is bent relative to the first part 2231 toward the side closer to the insulating sealing structure 224.

[0140] In the above technical solution, the bending structure of the second part 2232 increases the structural complexity of the second clamping member 223 to a certain extent, thereby improving the structural strength and rigidity. This enables the second clamping member 223 to better maintain its shape and position when subjected to clamping force and external force, reducing the possibility of deformation, and thus improving the structural stability and reliability of the entire battery cell 20.

[0141] In some embodiments of this application, reference is made to Figure 10 The second clamping member 223 includes a third part 2233, which is connected to the side of the second part 2232 away from the electrode assembly 23. In the above technical solution, the third part 2233 can better cooperate with the insulating sealing structure 224, further increasing the compression of the insulating sealing structure 224, thereby further enhancing the insulation and sealing effect of the electrode body 221.

[0142] In some embodiments of this application, reference is made to Figure 7 The first clamping member 222 includes a first material layer 2201 and a second material layer 2202 connected together. The second material layer 2202 is disposed on the side of the first material layer 2201 close to the second clamping member 223, and its strength is greater than that of the first material layer 2201.

[0143] The first material layer 2201 and the second material layer 2202 can refer to two layered structural components made of different materials, wherein the material strength of the second material layer 2202 is greater than that of the first material layer 2201. The materials of the first material layer 2201 and the second material layer 2202 can be, but are not limited to, aluminum and aluminum alloys, copper and copper alloys, stainless steel, lead, nickel and nickel alloys, etc. (Refer to...) Figure 8 Before manufacturing, the first clamping member 222 can be formed by stacking a first material layer 2201 and a second material layer 2202, and then extruding or bending it to form the desired shape.

[0144] In the above technical solution, by setting the first clamping member 222 into the above structure, the second material layer 2202 can be used as a reinforcing material to improve the overall structural strength and rigidity of the first clamping member 222, thereby improving the effect of the first clamping member 222 to withstand greater forces, reducing the risk of deformation of the first clamping member 222, and thus reducing the risk of the pole body 221 and the first clamping member 222 becoming loose, thereby improving the overall reliability of the pole assembly 22.

[0145] In some embodiments of this application, the first material layer 2201 and the first wall 211 are made of the same material.

[0146] In the above technical solution, by setting the materials of the first material layer 2201 and the first wall 211 to be the same, it is easier to connect the first material layer 2201 and the first wall 211. For example, the first clamping member 222 is usually connected to the housing assembly 21 by welding. Using the same material for the first material layer 2201 and the first wall 211 facilitates good welding and improves connection reliability.

[0147] In some embodiments of this application, reference is made to Figure 7 The first material layer 2201 and the first wall 211 are made of aluminum, and the second material layer 2202 is made of stainless steel.

[0148] In the above technical solution, the first material layer 2201 and the first wall 211 are made of aluminum, which can reduce material costs. The second material layer 2202 is made of stainless steel, which can reduce material costs while providing good reinforcement.

[0149] In some embodiments of this application, reference is made to Figure 7 The second clamping member 223 includes a third material layer 2203 and a fourth material layer 2204 connected together. The fourth material layer 2204 is disposed on the side of the third material layer 2203 near the first clamping member 222, and its strength is greater than that of the third material layer 2203.

[0150] The third material layer 2203 and the fourth material layer 2204 can refer to layered structural components made of two different materials, wherein the material strength of the fourth material layer 2204 is greater than that of the third material layer 2203. The materials of the third material layer 2203 and the fourth material layer 2204 can be, but are not limited to, aluminum and aluminum alloys, copper and copper alloys, stainless steel, lead, nickel and nickel alloys, etc. (Refer to...) Figure 9 Before manufacturing, the second clamping member 223 can be formed by stacking the third material layer 2203 and the fourth material layer 2204, and then extruding or bending it to form the desired shape.

[0151] In the above technical solution, by setting the second clamping member 223 into the above structure, the fourth material layer 2204 can be used as a reinforcing material to improve the overall structural strength and rigidity of the second clamping member 223, thereby improving the effect of the second clamping member 223 to withstand greater forces, reducing the risk of deformation of the second clamping member 223, and thus reducing the risk of loosening between the pole body 221 and the second clamping member 223, thereby improving the overall reliability of the pole assembly 22.

[0152] In some embodiments of this application, reference is made to Figure 7 The electrode body 221 may include a first material part 2206 and a second material part 2207 connected together. The second material part 2207 is disposed on the side of the first material part 2206 near the electrode assembly 23 and is electrically connected to the electrode assembly 23.

[0153] The first material portion 2206 and the second material portion 2207 can refer to components made of different materials, and may include, but are not limited to, copper, aluminum, nickel, etc. The first material portion 2206 is made of the same material as the externally welded conductive component (e.g., a electrode). For example, the first material portion 2206 can be aluminum, and the second material portion 2207 can be copper.

[0154] It is understandable that the electrode body 221 is made of composite material. On the one hand, this structure can balance material cost and conductivity. For example, the second material part 2207 located inside the housing assembly 21 is copper, which can have high conductivity, which is conducive to efficient current conduction between the electrode body 221 and the electrode assembly 23. On the other hand, the first material part 2206 on the outside can be aluminum, which can reduce cost while having good conductivity.

[0155] On the other hand, in order to ensure efficient current conduction between the electrode assembly 22 and the electrode assembly 23, the part where the electrode body 221 and the electrode assembly 23 are connected is preferably made of a material with high conductivity, which results in higher material costs. The electrode body 221 needs to be welded to external conductive components, such as a bar plate. The bar plate is made of aluminum, which is cheaper and has better conductivity. In this case, the material of the electrode is often different from that of the bar plate, which is not conducive to welding. In this case, the electrode body 221 is composed of two materials: a first material part 2206 and a second material part 2207. This can satisfy the requirements of efficient current conduction while also facilitating welding to external conductive components.

[0156] In the above technical solution, by setting the electrode body 221 to include a first material part 2206 and a second material part 2207, the electrode body 221 can be a composite material electrode, which can reduce costs while meeting the requirements of efficient current conduction, and also facilitates the welding of the electrode body 221 to external conductive components, thereby improving the manufacturability of the electrode assembly 23 and increasing the product yield of the electrode assembly 23.

[0157] In some embodiments of this application, reference is made to Figure 10 The insulating sealing structure 224 includes a sealing element 2241 and a first insulating element 2242. The sealing element 2241 is disposed between the pole body 221 and the second clamping element 223, and the first insulating element 2242 is disposed between the pole body 221 and the first clamping element 222.

[0158] The seal 2241 can refer to a structure or component used to isolate the interior of the battery cell 20 from the external environment, and the material can include, but is not limited to, rubber (e.g., nitrile rubber), plastic (e.g., polyolefins), etc. The seal 2241 can be understood as an annular structure positioned in a third direction Z around the electrode post body 221. For example, the seal 2241 can be a sealing ring.

[0159] The first insulating component 2242 can refer to a part used to prevent short circuits between the electrode body 221 and the housing assembly 21, and its material can include, but is not limited to, plastics (e.g., polyethylene, polypropylene, polycarbonate, polyamide), ceramics, etc. For example, the first insulating component 2242 can be a plastic part. The first insulating component 2242 can be a pre-formed part, subsequently assembled between the electrode body 221 and the first clamping member 222, or it can be injection molded between the electrode body 221 and the first clamping member 222. The first insulating component 2242 can be a ring-shaped structure arranged circumferentially around the electrode body 221.

[0160] In the above technical solution, by setting the sealing element 2241, the sealing performance between the terminal body 221 and the second clamping element 223 can be improved, reducing the risk of electrolyte leakage inside the housing assembly 21 and reducing the probability of external moisture, dust, and other particulate matter entering the housing assembly 21, thereby improving the reliability of the battery cell 20. By setting the first insulating element 2242, an insulating connection can be achieved between the first clamping element 222 and the terminal body 221, reducing the risk of short circuit between the first clamping element 222 and the terminal body 221. Moreover, it can also play a certain sealing role between the first clamping element 222 and the terminal body 221, enhancing the sealing performance between the first clamping element 222 and the terminal body 221, thereby improving the reliability of the terminal assembly 22 and thus improving the reliability of the battery cell 20.

[0161] In some embodiments of this application, reference is made to Figure 10 The insulating sealing structure 224 includes a second insulating member 2243, which is disposed on the outer side of the first clamping member 222 away from the pole body 221 and is connected to the first insulating member 2242.

[0162] The second insulating member 2243 and the first insulating member 2242 can be made of the same or different materials, and both can serve as insulation and a certain degree of sealing. For example, the second insulating member 2243 is a plastic part. The second insulating member 2243 can be a pre-formed part, subsequently assembled onto the outer surface of the first clamping member 222, or it can be injection molded onto the outer surface of the pole body 221. The second insulating member 2243 can be a ring-shaped structure circumferentially arranged around the pole body 221.

[0163] In the above technical solution, the second insulating member 2243 connects to the first insulating member 2242 and covers the outer surface of the first clamping member 222 away from the terminal body 221, which can further expand the insulation area and form a more comprehensive insulation protection layer. This not only prevents leakage between the terminal body 221 and the first clamping member 222, but also avoids potential electrical conduction between the outer surface of the first clamping member 222 and other surrounding components, effectively improving the insulation performance of the battery cell 20, reducing the risk of leakage, and increasing the reliability of the battery cell 20. The second insulating member 2243 and the first insulating member 2242 are connected, thereby forming a continuous insulation barrier and increasing the insulation boundary, enhancing the insulation performance between the terminal body 221 and the first clamping member 222, and thus improving the reliability of the terminal assembly 22, which in turn improves the reliability of the battery cell 20.

[0164] In some embodiments of this application, reference is made to Figure 10The first insulating component 2242 and the second insulating component 2243 are integrally formed. In this technical solution, the integrally formed structural design helps to reduce the number of parts, thereby reducing assembly steps, simplifying the production process, and reducing manufacturing costs.

[0165] In some embodiments of this application, reference is made to Figure 10 The insulating sealing structure 224 includes a third insulating member 2244, which is disposed on the side of the second clamping member 223 near the electrode assembly 23, and the third insulating member 2244 abuts against the sealing member 2241.

[0166] The third insulating member 2244 and the first insulating member 2242 can be made of the same or different materials, and both can serve as insulation and a certain degree of sealing. For example, the third insulating member 2244 is a plastic part, and can be a pre-formed part or an injection-molded part. The third insulating member 2244 can be a ring-shaped structure arranged circumferentially around the pole body 221.

[0167] In the above technical solution, the third insulating member 2244 is disposed on the side of the second clamping member 223 near the electrode assembly 23, further expanding the insulation area and effectively isolating the electrical connection between the electrode assembly 23 and the second clamping member 223. The third insulating member 2244 abuts against the sealing member 2241, forming a more complete insulation barrier, preventing current leakage to the second clamping member 223, avoiding possible short circuits and leakage risks, and improving the reliability of the battery cell 20.

[0168] In some embodiments of this application, reference is made to Figure 3 , Figure 4 and Figure 7 The battery cell 20 includes an insulating component 24, which is disposed on the inner side of the first wall 211 and abuts against or connects to the third insulating component 2244.

[0169] The insulating component 24 and the first insulating component 2242 can be made of the same or different materials, and can also serve as insulation and a certain degree of sealing. For example, the insulating component 24 is a plastic part, and can be in the form of a thin plate.

[0170] In the above technical solution, the insulating component 24 is installed inside the first wall 211 and is connected to or abuts against the third insulating component 2244, providing additional support for the internal structures such as the pole assembly 22 and the electrode assembly 23. The insulating component 24 abuts against or connects with the third insulating component 2244, forming a more complete and continuous insulation system, thereby expanding the insulation range and reducing the risk of short circuits caused by electrical contact between the electrode assembly 23 and the first wall 211.

[0171] In some embodiments of this application, reference is made to Figure 11The protruding structure 25 is replaced by a structure set on the second clamping member 223, and the protruding structure 25 is arranged in a ring around the mounting hole 211a.

[0172] In the above technical solution, the protruding structure 25 can strengthen the second clamping member 223, improve the structural strength and rigidity of the second clamping member 223, so as to better withstand the force from the pole body 221, reduce the risk of large deformation of the second clamping member 223, and reduce the probability of the pole body 221 detaching from the first clamping member 222 and the second clamping member 223. It can also reduce the probability of insufficient compression of the insulating sealing structure 224, thereby improving the reliability of the pole assembly 22 and the reliability of the battery cell 20.

[0173] In some embodiments of this application, reference is made to Figure 11 The second clamping member 223 includes an outer ring structure 2235 and an inner ring structure 2236. A protruding structure 25 is formed between the outer ring portion 2113 and the inner ring portion 2112. The outer ring portion 2113 is insulated and sealed to the mounting hole 211a. The inner ring portion 2112 is connected to the outer ring structure 2235. In the direction from the first clamping member 222 to the pole body 221, the size of the outer ring structure 2235 is smaller than the size of the inner ring structure 2236.

[0174] As an example, the first clamping member 222 and the second clamping member 223 can be connected by welding. By adopting the above scheme, the protruding structure 25 can be moved away from the welding marks of the first clamping member 222 and the second clamping member 223, thereby providing a larger operating space for welding the first clamping member 222 and the second clamping member 223, which is beneficial to improving the welding reliability and welding quality of the first clamping member 222 and the second clamping member 223.

[0175] In the above technical solution, the size of the outer ring structure 2235 is smaller than the size of the inner ring structure 2236. This allows the protruding structure 25 to be as far away from the first clamping member 222 as possible while ensuring the second clamping member 223 has high structural strength and rigidity. This facilitates the connection between the first clamping member 222 and the second clamping member 223 and improves the reliability of the connection. In some embodiments of this application, reference is made to... Figure 11 The inner ring structure 2236 protrudes outward relative to the outer ring structure 2235 toward the outer side of the housing assembly 21.

[0176] In the above technical solution, the inner ring structure 2236 adopts a more protruding design, which can increase the height of the pole assembly 22 relative to the first wall 211. The space around the pole body 221 is larger and there is less interference, which is conducive to the connection of the pole body 221 and other components (such as the bar, busbar, etc.), thereby improving the reliability and convenience of the connection between the pole assembly 22 and external components.

[0177] In some embodiments of this application, the outer ring structure 2235 protrudes outward relative to the inner ring structure 2236 toward the outer side of the housing assembly 21.

[0178] In the above technical solution, the outer ring structure 2235 has a lower height than the inner ring structure 2236, which reduces the protrusion height of the electrode assembly 22 relative to the first wall 211. This results in a more compact overall structure for the battery cell 20, which is beneficial for improving the energy density of the battery cell 20. Furthermore, when multiple battery cells 20 are assembled into a battery device 100, this method helps reduce the dimensions of the battery device 100 in the third direction Z, thus improving the energy density of the battery device 100.

[0179] Reference Figure 2 This application provides a battery device 100, which includes a battery cell 20 as described in any of the embodiments above.

[0180] In the above technical solution, since the battery cell 20 has high reliability, the battery device 100 using the battery cell 20 can have good reliability.

[0181] Reference Figure 1 This application provides an electrical device 1000, which includes a battery cell 20 as described in any of the preceding embodiments, or a battery device 100 as described in the preceding embodiments.

[0182] In the above technical solution, since the battery cell 20 or battery device 100 has high reliability, it is beneficial to improve the reliability of the electrical device 1000 that uses the battery cell 20 or battery device 100.

[0183] The following describes a specific embodiment of the battery cell 20 of this application with reference to the accompanying drawings.

[0184] Example 1

[0185] Reference Figure 3 and Figure 4 A battery cell 20 provided according to an embodiment of this application includes: a housing assembly 21, a terminal assembly 22, an electrode assembly 23, and an insulating component 24.

[0186] The housing assembly 21 includes a first wall 211 with a mounting hole 211a. A protruding structure 25 is formed by bending the first wall 211, and the protruding structure 25 is arranged circumferentially around the mounting hole 211a. The protruding structure 25 has a transition fillet 251 on the side of the first wall 211 away from the electrode assembly 23. The transition fillet 251 includes a first fillet 252 and a second fillet 253 connected together, and the radius of the second fillet 253 is larger than the radius of the first fillet 252.

[0187] The electrode assembly 22 is installed in the mounting hole 211a and includes an electrode body 221, a first clamping member 222, a second clamping member 223, and an insulating sealing structure 224. The first clamping member 222 is located on the side of the second clamping member 223 away from the housing assembly 21. The first clamping member 222 and the second clamping member 223 clamp the electrode body 221 through the insulating sealing structure 224, and a portion of the second clamping member 223 is bent toward the side closer to the insulating sealing structure 224. The second clamping member 223 includes a first portion 2231 and a second portion 2232. The first portion 2231 is connected to the first clamping member 222, and the second portion 2232 and the first clamping member 222 clamp the electrode body 221 through the insulating sealing structure 224. In the thickness direction of the first wall 211, the thickness of the first portion 2231 is greater than the thickness of the second portion 2232. The second portion 2232 is bent toward the side closer to the insulating sealing structure 224 relative to the first portion 2231.

[0188] The insulating sealing structure 224 includes a sealing element 2241, a first insulating element 2242, a second insulating element 2243, and a third insulating element 2244. The sealing element 2241 is disposed between the electrode body 221 and the second clamping element 223. The first insulating element 2242 is disposed between the electrode body 221 and the first clamping element 222. The second insulating element 2243 is disposed on the outer side of the first clamping element 222 away from the electrode body 221 and is connected to the first insulating element 2242. The first insulating element 2242 and the second insulating element 2243 are integrally formed. The third insulating element 2244 is disposed on the side of the second clamping element 223 near the electrode assembly 23 and abuts against the sealing element 2241.

[0189] The electrode assembly 23 is located inside the housing assembly 21 and is electrically connected to the electrode body 221.

[0190] The insulating component 24 is disposed on the inner side of the first wall 211 and abuts against or connects to the third insulating component 2244.

[0191] Reference Figure 12In the above technical solution, the components of the electrode assembly 22 are pre-assembled before assembly. The electrode assembly 23 can be installed into the housing assembly 21 first. The tab 231 of the electrode assembly 23 passes through the mounting hole 211a. The tab 231 is welded to the electrode body 221 of the electrode assembly 22 on the outside of the housing assembly 21. Then, the second clamping member 223 of the electrode assembly 22 is installed in the mounting hole 211a, and the first wall 211 and the second clamping member 223 are welded together. With the above structure, the protruding structure 25 surrounding the mounting hole 211a on the first wall 211 of the battery cell 20 can improve the structural strength and rigidity of the first wall 211. When the electrode body 221 is subjected to large forces, it can reduce the risk of large deformation of the first wall 211, thereby reducing the risk of the electrode body 221 detaching from the first wall 211 and improving the reliability of the battery cell 20. The second clamping member 223 is bent towards the side closer to the insulating sealing structure 224, which can fit more tightly to the electrode body 221, further enhancing the clamping force on the electrode body 221. Moreover, this structure can also increase the compression of the insulating sealing structure 224, thereby enhancing the insulation and sealing effect of the insulating sealing structure 224 on the electrode body 221, and further improving the reliability of the battery cell 20.

[0192] Example 2

[0193] Reference Figure 11 The battery cell 20 in Embodiment 2 has a similar structure to the battery cell 20 in Embodiment 1, except that the protruding structure 25 is provided on the second clamping member 223.

[0194] In the battery cell 20 of the above embodiment, the protruding structure 25 can strengthen the second clamping member 223, improve the structural strength and rigidity of the second clamping member 223, thereby better withstanding the force from the terminal body 221, reducing the risk of large deformation of the second clamping member 223, which in turn reduces the probability of the terminal body 221 detaching from the first clamping member 222 and the second clamping member 223, and also reduces the probability of insufficient compression of the insulating sealing structure 224, thereby improving the reliability of the terminal assembly 22 and the battery cell 20.

[0195] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The above are merely preferred embodiments of this application and are not intended to limit the application. For those skilled in the art, unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: A housing assembly includes a first wall, the first wall having a mounting hole, and a protruding structure formed by bending on the first wall, the protruding structure being arranged circumferentially around the mounting hole; An electrode assembly is mounted in the mounting hole and includes an electrode body, a first clamping member, a second clamping member, and an insulating sealing structure. The first clamping member is located on the side of the second clamping member away from the housing assembly. The first clamping member and the second clamping member clamp the electrode body through the insulating sealing structure, and a portion of the second clamping member is bent toward the side closer to the insulating sealing structure. An electrode assembly is disposed within the housing assembly and is electrically connected to the electrode body.

2. The battery cell according to claim 1, characterized in that, The protruding structure has a rounded corner on the side of the first wall away from the electrode assembly.

3. The battery cell according to claim 2, characterized in that, The transition fillet includes a first fillet and a second fillet connected together, wherein the radius of the second fillet is greater than the radius of the first fillet.

4. The battery cell according to claim 3, characterized in that, The radius of the first fillet is R1, where R1 ≥ 0.5 mm.

5. The battery cell according to claim 3 or 4, characterized in that, The radius of the second fillet is R2, where R2 ≥ 1.5 mm.

6. The battery cell according to claim 1, characterized in that, In the thickness direction of the first wall, the protrusion height of the protruding structure is H, where 1mm≤H≤2mm.

7. The battery cell according to claim 1, characterized in that, The first wall includes an inner ring portion and an outer ring portion connected together, with the protruding structure formed between the inner ring portion and the outer ring portion. The inner ring portion is provided with the mounting hole, and in the direction from the first clamping member to the pole body, the size of the outer ring portion is larger than the size of the inner ring portion.

8. The battery cell according to claim 7, characterized in that, The inner ring portion protrudes outward relative to the outer ring portion toward the outer side of the housing assembly.

9. The battery cell according to claim 7, characterized in that, The outer ring portion protrudes outward relative to the inner ring portion toward the outer side of the housing assembly.

10. The battery cell according to any one of claims 1 to 4, 6 to 9, characterized in that, The housing assembly includes an outer shell and a cover plate, one end of the outer shell having an opening, the cover plate covering the opening, and the first wall being disposed on the outer shell or the cover plate.

11. The battery cell according to any one of claims 1 to 4, 6 to 9, characterized in that, The second clamping member includes a first part and a second part. The first part is connected to the first clamping member, and the second part and the first clamping member clamp the pole body through the insulating sealing structure. In the thickness direction of the first wall, the thickness of the first part is greater than the thickness of the second part.

12. The battery cell according to claim 11, characterized in that, The second part is bent relative to the first part toward the side closer to the insulating sealing structure.

13. The battery cell according to any one of claims 1 to 4, 6 to 9, characterized in that, The first clamping member includes a first material layer and a second material layer connected together. The second material layer is disposed on the side of the first material layer near the second clamping member and has a strength greater than that of the first material layer.

14. The battery cell according to claim 13, characterized in that, The first material layer and the first wall are made of the same material.

15. The battery cell according to claim 13, characterized in that, The first material layer and the first wall are made of aluminum, and the second material layer is made of stainless steel.

16. The battery cell according to any one of claims 1 to 4, 6 to 9, characterized in that, The second clamping member includes a third material layer and a fourth material layer connected together. The fourth material layer is disposed on the side of the third material layer near the first clamping member and has a strength greater than that of the third material layer.

17. The battery cell according to claim 1, characterized in that, The insulating sealing structure includes a sealing element and a first insulating element. The sealing element is disposed between the pole body and the second clamping element, and the first insulating element is disposed between the pole body and the first clamping element.

18. The battery cell according to claim 17, characterized in that, The insulating sealing structure includes a second insulating element, which is disposed on the outer side of the first clamping member away from the pole body and connected to the first insulating element.

19. The battery cell according to claim 18, characterized in that, The first insulating component and the second insulating component are integrally formed.

20. The battery cell according to claim 17, characterized in that, The insulating sealing structure includes a third insulating element, which is disposed on the side of the second clamping member near the electrode assembly and abuts against the sealing member.

21. The battery cell according to claim 20, characterized in that, The battery cell includes an insulating component, which is located on the inner side of the first wall and abuts against or connects to the third insulating component.

22. The battery cell according to any one of claims 1 to 6, 10 to 21, characterized in that, The protruding structure is replaced by one disposed on the second clamping member, and the protruding structure is arranged in a ring around the mounting hole.

23. The battery cell according to claim 22, characterized in that, The second clamping member includes an outer ring structure and an inner ring structure. The protruding structure is formed between the outer ring portion and the inner ring portion. The outer ring portion is insulated and sealed to the mounting hole. The inner ring portion is connected to the outer ring structure. In the direction from the first clamping member to the pole body, the size of the outer ring structure is smaller than the size of the inner ring structure.

24. The battery cell according to claim 23, characterized in that, The inner ring structure protrudes outward relative to the outer ring structure toward the outer side of the housing assembly.

25. The battery cell according to claim 23, characterized in that, The outer ring structure protrudes outward relative to the inner ring structure toward the outer side of the housing assembly.

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

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

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