Single battery, battery assembly and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a single battery, a battery assembly and electric equipment. Each single battery comprises a battery shell, a pole structure and a battery cell structure; the pole structure comprises a connecting structure and a pole sleeve, the pole sleeve is arranged in the pole hole in a penetrating manner, an accommodating cavity is formed in the pole sleeve in a penetrating manner, and the connecting structure is connected to the pole sleeve and covers an opening of the accommodating cavity; the battery core structure comprises a pole lug and a battery core body which are connected with each other, the battery core body is accommodated in the battery shell, the accommodating cavity is positioned on one side of the battery core body, the pole lug is arranged in the connecting structure in a penetrating manner and is accommodated in the accommodating cavity, and one end, far away from the battery core body, of the pole lug is connected to the pole column structure. According to the single battery, the design of the battery shell and the pole structure is optimized, so that the processing difficulty of the pole structure is effectively reduced, and meanwhile, the safety and the reliability of the whole structure of the single battery are improved.

Description

Technical Field

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

[0002] With the rapid development of electric vehicles, energy storage devices, and portable electronic products, the market demands increasingly higher battery performance, especially in terms of high energy density, low cost, and safety. Furthermore, the structural design of a battery directly affects its energy density and manufacturing process. However, there is still considerable room for improvement in the battery structure of current technologies.

[0003] Currently, traditional battery designs commonly employ a method of welding solid terminals and lead plates. This design introduces additional risks during the welding process due to the shared space occupied by the tabs and terminals. Weld slag generated during welding can penetrate into the cell, significantly increasing the risk of short circuits and potentially causing abnormal self-discharge during use, thus affecting its reliability and normal operation. Furthermore, the high-stress tension during welding can cause the tabs to break, directly impacting the battery's electrical connections and overall performance, creating potential safety hazards.

[0004] Therefore, it is necessary to address the above-mentioned problems in order to change the current situation. Utility Model Content

[0005] This application provides a single battery cell, a battery module, and an electrical device to solve the problem of potential safety hazards caused by the welding of the tabs and terminals in the prior art.

[0006] The first aspect of this application provides a single-cell battery, comprising:

[0007] The battery casing has terminal holes;

[0008] An electrode post structure includes a connecting structure and an electrode post sleeve, the electrode post sleeve passing through the electrode post hole and having a receiving cavity therethrough, the connecting structure being connected to the electrode post sleeve and covering the opening of the receiving cavity; and

[0009] A battery cell structure includes connected tabs and a cell body, the cell body being housed within a battery casing, and the receiving cavity being located on one side of the cell body, the tabs being inserted through the connecting structure and housed within the receiving cavity, and the end of the tab furthest from the cell body being connected to the terminal post structure.

[0010] In one possible implementation, the connection structure has a first connection hole and a second connection hole communicating with the receiving cavity, and the first connection hole and the second connection hole are arranged side by side. The electrode tabs are respectively inserted into the first connection hole and the second connection hole and housed in the receiving cavity, and the end of the electrode tab away from the cell body is connected to the electrode post structure.

[0011] In one possible implementation, the number of battery cell structures is multiple sets, and the tabs of the multiple sets of battery cell structures are respectively passed through the first connection hole and the second connection hole and connected to the connection structure.

[0012] In one possible implementation, the pole sleeve is further provided with a positioning groove communicating with the receiving cavity; the pole structure also includes a sealing cap, the sealing cap being housed in the positioning groove and covering the opening at one end of the receiving cavity away from the connecting structure, and the sealing cap being electrically connected to the pole sleeve.

[0013] In one possible implementation, the sealing cap includes a cap seat and a cap body, the cap body being detachably connected to the cap seat, and the cap seat being accommodated within the positioning groove and connected to the pole sleeve, the cap body being used for connection to an external circuit.

[0014] In one possible implementation, the outer peripheral wall of the cover is provided with a first positioning slope, and the inner wall of the positioning groove is provided with a second positioning slope, wherein the first positioning slope and the second positioning slope are fitted together.

[0015] In one possible implementation, the connection structure includes a connecting piece and a peripheral portion, the peripheral portion being disposed on the outside of the connecting piece, and the first connecting hole and the second connecting hole being disposed on the connecting piece, the peripheral portion surrounding the connecting piece and enclosing the outer openings of the first connecting hole and the second connecting hole, and the peripheral portion being connected to the pole sleeve.

[0016] In one possible implementation, the connection structure further includes a fusible portion disposed on the connecting piece and between the first connecting hole and the second connecting hole; the fusible portion protrudes from the connecting piece toward a direction away from the receiving cavity, or the thickness of the fusible portion is less than the thickness of the connecting piece.

[0017] In one possible implementation, the connecting structure is further provided with a through hole, which is spaced apart from the first connecting hole and the second connecting hole, and is located between the first connecting hole and the second connecting hole along the radial direction of the connecting piece.

[0018] In one possible implementation, the connecting piece is provided with reinforcing ribs that protrude outward from the surface of the connecting piece.

[0019] In one possible implementation, the reinforcing rib protrudes from one side surface of the connecting piece by a height of 0.1mm-1.5mm.

[0020] In one possible implementation, the thickness of the connecting piece is 0.05mm-1.5mm.

[0021] In one possible implementation, the first connecting hole and the second connecting hole are arranged sequentially along a first direction, the dimension of the connecting piece in the first direction is d, and the dimension of the peripheral portion in the first direction is 0.5mm-1 / 2d.

[0022] In one possible implementation, the width of the orthographic projection of the peripheral portion onto the pole sleeve is 0.5mm-3mm.

[0023] In one possible implementation, the connection structure is welded and fixed to the pole sleeve.

[0024] In one possible implementation, the electrode structure further includes an insulating sheet disposed between the electrode structure and the battery casing.

[0025] In one possible implementation, the pole structure further includes a fixing plate sleeved on the outside of the pole sleeve, and the insulating plate is at least partially sleeved on the outside of the fixing plate.

[0026] In one possible implementation, the outer wall of the pole sleeve is provided with a mounting groove, and the fixing piece is at least partially embedded in the mounting groove.

[0027] In one possible implementation, the terminal structure further includes a sealing gasket disposed between the terminal structure and the battery housing.

[0028] In one possible implementation, the terminal sleeve further includes a flange portion disposed on the outer side of the terminal sleeve and located on the inner side of the battery housing, the flange portion at least partially abutting against the inner wall of the battery housing, and the sealing gasket disposed on the outer side of the terminal sleeve and abutting against the flange portion.

[0029] A second aspect of this application provides a battery assembly comprising a plurality of individual cells as described in any of the preceding claims, wherein the plurality of individual cells are connected in parallel or in series.

[0030] A third aspect of this application provides an electrical appliance, comprising:

[0031] Electrical appliances; and

[0032] The battery assembly as described in any of the preceding claims, or the individual battery cell as described in any of the preceding claims, wherein the individual battery cell is electrically connected to the electrical device.

[0033] Implementing the embodiments of this application has the following beneficial effects:

[0034] The single-cell battery in this implementation effectively reduces the processing difficulty of the electrode structure by optimizing the design of the battery casing and electrode structure, while improving the overall safety and reliability of the single-cell battery structure.

[0035] Specifically, this design employs a combination of a terminal sleeve and a connecting structure. This allows the terminal sleeve to be easily inserted into the terminal hole of the battery casing. During assembly, the tabs of the cell structure can be inserted into the connecting structure and housed within its receiving cavity. This design not only simplifies the connection process between the terminal structure and the cell structure but also reduces welding process requirements, effectively lowering the risk of weld slag intruding into the cell body during welding. This, in turn, reduces the possibility of short circuits and self-discharge anomalies, further enhancing the safety and reliability of the individual battery cells. Furthermore, by combining the connecting structure with the terminal sleeve to form the terminal structure, both the connecting structure and the terminal sleeve can be processed and reassembled separately, reducing the processing difficulty and manufacturing cost of the terminal structure. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A perspective view of a single battery cell in an embodiment of this utility model is shown;

[0038] Figure 2 A front view of a single battery cell in an embodiment of this utility model is shown;

[0039] Figure 3 It shows Figure 2 Sectional view along line AA;

[0040] Figure 4 It shows Figure 3 A magnified view of part B in the middle;

[0041] Figure 5 A top view of the single cell structure in an embodiment of this utility model is shown;

[0042] Figure 6An exploded view of the pole structure in an embodiment of this utility model is shown;

[0043] Figure 7 A top view of the connection structure in an embodiment of this utility model is shown;

[0044] Figure label:

[0045] 10-Single cell;

[0046] 100 - Battery casing; 110 - Terminal hole;

[0047] 200 - Pole post structure; 210 - Connecting structure; 211 - Connecting piece; 2111 - First connecting hole; 2112 - Second connecting hole; 2113 - Reinforcing rib; 2114 - Through hole; 212 - Peripheral part; 213 - Fusible part; 220 - Pole post sleeve; 221 - Receiving cavity; 222 - Positioning groove; 2221 - Second positioning bevel; 223 - Flange part; 224 - Mounting groove; 230 - Sealing cover; 231 - Cover seat; 2311 - First positioning bevel; 232 - Cover body; 240 - Insulating piece; 250 - Sealing gasket; 260 - Fixing piece;

[0048] 300 - Cell structure; 310 - Tab; 320 - Cell body. Detailed Implementation

[0049] 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 and completely 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.

[0050] With the rapid development of electric vehicles, energy storage devices, and portable electronic products, the market demands increasingly higher battery performance, especially in terms of high energy density, low cost, and safety. Furthermore, the structural design of a single battery cell directly affects its energy density and manufacturing process. However, there is still considerable room for improvement in the battery structure of existing technologies.

[0051] Currently, traditional battery designs commonly employ a method of welding solid terminals and lead plates. This design introduces additional risks during the welding process due to the shared space occupied by the tabs and terminals. Weld slag generated during welding may penetrate into the cell, significantly increasing the risk of short circuits and potentially causing abnormal self-discharge during battery use, thus affecting its reliability and normal operation.

[0052] Furthermore, in some existing battery solutions, separate holes are set on the terminals to accommodate the tabs of multiple battery cells. In this case, the tabs of multiple battery cells are led out from a single hole. The extension length of the tabs far from the hole will be greater than that of the tabs close to the hole, resulting in increased waste of current collector foil and increased cost. The risk of tab tearing during the production line process is further increased, and the tab resistance will also increase, resulting in greater heat generation. The high stress pulling during the welding process may cause the tabs to break, which will directly affect the electrical connection and overall performance of the single battery cell 10, causing potential safety hazards.

[0053] Based on this, see Figures 1 to 7 As shown, this utility model embodiment provides a single-cell battery 10, which includes a battery housing 100 and a terminal structure 200; the single-cell battery 10 includes a battery housing 100, a terminal structure 200, and a cell structure 300; the battery housing 100 has a terminal hole 110; the terminal structure 200 includes a connecting structure 210 and a terminal sleeve 220, the terminal sleeve 220 passing through the terminal hole 110, and the terminal sleeve 220 having a receiving cavity 221 through it; the connecting structure 210... The electrode is connected to the terminal sleeve 220 and covers the opening of the receiving cavity 221; the cell structure 300 includes a connected electrode tab 310 and a cell body 320, the cell body 320 is housed in the battery casing 100, and the receiving cavity 221 is located on the side of the terminal structure 200 away from the cell body 320, the electrode tab 310 passes through the connecting structure 210 and is housed in the receiving cavity 221, and the end of the electrode tab 310 away from the cell body 320 is connected to the terminal structure 200.

[0054] The single cell 10 of this embodiment effectively reduces the processing difficulty of the electrode structure 200 by optimizing the design of the battery casing 100 and the electrode structure 200, while improving the safety and reliability of the overall structure of the single cell 10.

[0055] Specifically, the design adopts a combination of terminal sleeve 220 and connecting structure 210, which allows the terminal sleeve 220 to be smoothly inserted into the terminal hole 110 of the battery housing 100. During assembly, the tab 310 of the cell structure 300 can be inserted into the connecting structure 210 and housed in the receiving cavity 221. This design not only simplifies the connection process between the terminal structure 200 and the cell structure 300, but also reduces the welding process requirements, effectively reducing the risk of welding slag intruding into the cell body 320 during welding, thereby reducing the possibility of short circuit and self-discharge abnormalities, and further improving the safety and reliability of the single cell 10.

[0056] Furthermore, by combining the connecting structure 210 with the pole sleeve 220 to form the pole structure 200, the connecting structure 210 and the pole sleeve 220 can be processed and reassembled separately, which can reduce the processing difficulty and manufacturing cost of the pole structure 200.

[0057] Specifically, the battery casing 100 can be manufactured by stamping or welding. In terms of material selection, the battery casing 100 can be made of aluminum or steel, but is not limited to these two materials. Aluminum, due to its excellent lightweight properties and good thermal conductivity, can reduce the overall weight of the battery and promote heat dissipation, making it suitable for applications requiring portability. Steel, on the other hand, has stronger structural strength and durability, and can better protect the internal components of the battery in harsh environments, making it suitable for demanding industrial and automotive applications.

[0058] Specifically, when the connecting structure 210 and the terminal sleeve 220 are fixed by welding, through-welding technology can be used to ensure good current-carrying performance at the connection point. The advantage of this welding method is that it can effectively improve the mechanical strength of the structure, enhance the overall electrical contact performance, and reduce battery failures caused by poor connections. Simultaneously, for high-current applications, through-welding technology can ensure uniform current distribution at the connection point, reduce the risk of localized heating, and improve safety. In some embodiments, the terminal sleeve 220 can be formed by stamping metal materials. Stamping not only produces components with complex shapes and good consistency but also significantly improves production efficiency and reduces costs. By using metal materials, such as aluminum or stainless steel, the terminal sleeve 220 can effectively resist electrochemical corrosion while ensuring strength, extending the lifespan of the individual battery cell 10. Furthermore, the stamped terminal sleeve 220 is relatively lightweight, which is beneficial for the lightweight design of the overall battery system, meeting the requirements of modern portable electronic devices and electric vehicles for low center of gravity and high energy density. When the connecting structure 210 and the terminal sleeve 220 are integrally molded, the terminal structure 200 can be formed by processing raw materials through cutting or other methods. The advantages of this method are higher overall strength, greater structural stability, and the ability to ensure precise dimensions and tolerances of the terminal during production. This not only improves the overall reliability of the single-cell battery 10 but also simplifies the manufacturing process, reduces production costs, and facilitates large-scale production.

[0059] In one embodiment, the connecting structure 210 has a first connecting hole 2111 and a second connecting hole 2112 communicating with the receiving cavity 221, and the first connecting hole 2111 and the second connecting hole 2112 are arranged side by side. The tabs 310 are respectively inserted into the first connecting hole 2111 and the second connecting hole 2112 and housed in the receiving cavity 221, and the end of the tab 310 away from the battery cell body 320 is connected to the pole post structure 200.

[0060] In this embodiment, the terminal sleeve 220 is used to connect to the battery housing 100 and the receiving cavity 221 is sealed by the connecting piece 211. This allows the tab 310 to pass through the connecting piece 211 from the first connecting hole 2111 and the second connecting hole 2112 and bend on the side of the connecting piece 211 away from the cell body 320. This prevents the welding slag from contacting the cell body 320 during the welding process between the tab 310 and the connecting piece 211, thereby improving the processing safety of the single cell 10.

[0061] Furthermore, considering the risk of breakage due to high stress during welding of the tab 310 in existing technologies, this embodiment arranges the first connecting hole 2111 and the second connecting hole 2112 side by side. This allows the tab 310 to be connected to a closer connecting hole, avoiding the situation in traditional batteries where multiple tabs 310 are simultaneously connected to a single hole, resulting in some tabs 310 experiencing significant tensile stress. This improvement optimizes the distribution of welding stress, reduces the possibility of tab 310 breakage, enhances the reliability of electrical connections, and improves the overall performance and long-term safety of the single battery cell 10.

[0062] Furthermore, the number of battery cell structures 300 is multiple sets, and the tabs 310 of the multiple sets of battery cell structures 300 are respectively inserted through the first connecting hole 2111 and the second connecting hole 2112 and connected to the connecting structure 210.

[0063] In the single-cell battery 10 of this embodiment, by providing a receiving cavity 221 within the electrode post structure 200, and by using the first connecting hole 2111 and the second connecting hole 2112 to allow the tabs 310 of multiple cell structures 300 to pass through and connect, the spatial layout of the single-cell battery 10 is optimized, and the overall space utilization efficiency is improved. Simultaneously, by placing the tabs 310 within the receiving cavity 221 on the side away from the cell body 320, the risk of welding slag intruding into the cell during welding is effectively reduced, thereby reducing the possibility of short circuits and self-discharge abnormalities, further improving the safety and reliability of the single-cell battery 10.

[0064] More specifically, in one embodiment, the first connecting hole 2111 and the second connecting hole 2112 are symmetrically arranged, and the two sets of cell structures 300 are also symmetrically arranged, with the two sets of cell structures 300 corresponding to the first connecting hole 2111 and the second connecting hole 2112 respectively. In this case, the tabs 310 of the two sets of cell structures 300 pass through the first connecting hole 2111 and the second connecting hole 2112 respectively into the receiving cavity 221. The tabs 310 of the two sets of cell structures 300 are also symmetrically arranged, and the distance between the tab 310 and the connecting hole in each set of cell structures 300 is minimized. This saves material on the tabs 310 while ensuring electrical conductivity. Of course, when the battery casing 100 has multiple sets of terminal structures 200, each set of terminal structures 200 can correspond to at least two sets of cell structures 300.

[0065] Furthermore, the terminal sleeve 220 not only serves as a conductor and provides mechanical support, but also has a positioning groove 222 that connects to the receiving cavity 221. The positioning groove 222 provides reliable space for the installation of the sealing cover 230, making the sealing operation of the receiving cavity 221 simpler and more efficient. The sealing cover 230 is housed in the positioning groove 222 and covers the opening at the end of the receiving cavity 221 away from the connecting structure 210, so that the receiving cavity 221 forms a closed environment, effectively preventing external moisture, dust and other contaminants from entering, ensuring the cleanliness of the internal environment of the receiving cavity 221, protecting the tab 310, and helping to extend the service life of the single cell 10.

[0066] In this embodiment, the cell structure 300 in the single battery cell 10 is electrically connected to an external electrical device via a connecting structure 210, a terminal sleeve 220, and a sealing cover 230, thereby achieving efficient linkage with the circuit. By using a metallic material, the sealing cover 230 not only effectively inhibits corrosion and improves durability but also provides good conductivity, ensuring a stable power connection. Through the design of the above structure, the combination of the terminal sleeve 220, the positioning groove 222, and the sealing cover 230 forms a highly efficient and reliable sealed conductive structure. This design effectively improves the overall performance of the single battery cell 10 and enhances its adaptability to different working environments, especially in high humidity or dusty environments, ensuring the stable operation and long lifespan of the single battery cell 10.

[0067] Specifically, the sealing cover 230's structural design includes a cover base 231 and a cover body 232, wherein the cover body 232 can be detachably connected to the cover base 231. The cover base 231 is housed inside the positioning groove 222 and closely engages with the pole sleeve 220, ensuring its stability and sealing during assembly. The cover body 232 is designed to connect to external circuitry, ensuring efficient current conduction and stable signal transmission.

[0068] In one embodiment, the sealing cap 230 can be made of metal by stamping. This choice not only enhances the durability and corrosion resistance of the sealing cap, but also improves its safety under high temperature and high pressure environments. The sealing cap 230, through its tight connection with the top of the pole sleeve 220, fully realizes the sealing function of the receiving cavity 221 of the pole sleeve 220, and also meets the connection requirements with the busbar of the electrode tab 310.

[0069] In terms of specific implementation, the detachable connection design of the cover 232 allows users to easily perform operations when maintenance or replacement is required. For example, the cover 232 can be connected to the cover base 231 via screws or a snap-fit ​​mechanism. The advantage of choosing screws as fasteners is that their connection is stable and easy to install and remove, allowing users to perform individual maintenance without disassembling the entire pole structure 200. A snap-fit ​​mechanism, on the other hand, allows for quick disassembly without additional tool operation, suitable for applications requiring frequent replacement or testing.

[0070] Furthermore, the outer peripheral wall of the cover 231 is provided with a first positioning inclined surface 2311, and the inner wall of the positioning groove 222 is provided with a second positioning inclined surface 2221. The first positioning inclined surface 2311 and the second positioning inclined surface 2221 are fitted together.

[0071] In this embodiment, the inclined surface design allows the cover 231 to self-align during assembly, ensuring accurate positioning of the cover 231 within the positioning groove 222. This structural design improves assembly efficiency, reduces assembly difficulty caused by errors, and enhances the stability of the fit between the cover 231 and the pole sleeve 220. Specifically, the second positioning inclined surface 2221 is set at an angle to the central axis of the receiving cavity 221, and the second positioning inclined surface 2221 forms a flared opening in the positioning groove 222, facilitating the assembly and positioning of the cover 231.

[0072] In one embodiment, the connection structure 210 includes a connecting piece 211 and a peripheral portion 212. The peripheral portion 212 is disposed on the outside of the connecting piece 211, forming an effective connection and conductivity method. A first connecting hole 2111 and a second connecting hole 2112 are disposed on the connecting piece 211. The peripheral portion 212 surrounds the connecting piece 211 and encloses the outer openings of the first connecting hole 2111 and the second connecting hole 2112. The peripheral portion 212 is connected to the pole sleeve 220.

[0073] In this embodiment, the tab 310 is welded to the connecting piece 211, through which current is collected. This design allows current to be effectively transferred from the tab 310 to the connecting piece 211, and then evenly introduced into the pole sleeve 220 through the peripheral portion 212. This current conduction path design not only helps to reduce contact resistance and improve current conduction efficiency, but also effectively reduces potential hot spots at the welding point, enhancing the safety and stability of the system.

[0074] Meanwhile, the welding of the tab 310 to the connecting piece 211 and the welding of the peripheral portion 212 to the pole sleeve 220 can be performed separately, thus avoiding potential defects generated during the welding process. When the two welding processes interfere with each other, it may affect the welding quality, leading to problems such as poor contact and an excessively large heat-affected zone, thereby affecting the current conduction efficiency and the reliability of the system. By performing the welding of the tab 310 and the peripheral portion 212 separately, the welding parameters and processes of each can be controlled, thereby ensuring the quality and consistency of the weld joint and reducing the incidence of welding defects.

[0075] Furthermore, the separate welding strategy allows for greater flexibility in welding operations, enabling operators to better adjust welding conditions to adapt to the welding requirements of different materials and contact surfaces, thereby improving welding efficiency. To ensure the precision and consistency of the welding process, it is recommended to perform appropriate cleaning and surface treatment on the contact surfaces before welding, such as using sandblasting or chemical cleaning methods, to remove surface oxides and impurities and improve the smoothness of the weld surface. Moreover, employing advanced welding technologies, such as laser welding or ultrasonic welding, can not only improve weld quality but also reduce the impact on the heat-affected zone, preventing material deformation and performance degradation.

[0076] Meanwhile, the connecting piece 211 can also be made of metal by stamping. The connecting piece 211 produced by stamping can achieve precise fit during installation, reduce assembly errors, and ensure the stability of the connection. At the same time, the use of metal materials improves the conductivity and durability of the connecting piece 211. Especially under high current load conditions, it can effectively reduce the heat generation problem caused by contact resistance, thereby improving the safety and performance of the single cell 10.

[0077] Further, see Figures 4 to 7 As shown, the connecting structure 210 also includes a fusible part 213, which is disposed on the connecting piece 211 and between the first connecting hole 2111 and the second connecting hole 2112. The fusible part 213 protrudes from the connecting piece 211 in a direction away from the receiving cavity 221, or the thickness of the fusible part 213 is less than the thickness of the connecting piece 211, so as to ensure that it can be quickly fused under specific conditions.

[0078] With this design, once the battery experiences thermal runaway, the fuse 213 on the connector 211 can quickly melt and cut off the current, preventing further battery deterioration and improving the safety of the entire battery system.

[0079] Specifically, the fusible portion 213 can protrude from one side surface of the connecting piece 211 so that the connecting piece 211 can form an effective fusible portion 213, while avoiding affecting the overall strength of the connecting piece 211. Of course, in some embodiments, the fusible portion 213 can also be formed by processing methods such as grinding. In this case, since the fusible portion 213 has a smaller thickness than the connecting piece 211, the connecting structure 210 is more likely to fuse at the fusible portion 213 when the battery experiences thermal runaway.

[0080] It should be further noted that the application of the fuse element 213 in ternary lithium batteries is extremely important. Its design and configuration aim to improve battery safety, especially in the face of abnormal operating conditions such as overcharging, short circuits, and thermal runaway. Ternary lithium batteries, as a type of lithium-ion battery using nickel, cobalt, and manganese as the main cathode materials, possess high energy density and excellent cycle performance, but the risk of thermal runaway still exists during use. Therefore, the configuration of the fuse element 213 becomes a key measure to ensure its safety.

[0081] The fuse element 213 is disposed on the connecting piece 211, positioned between the first connecting hole 2111 and the second connecting hole 2112. This unique design effectively creates a safe current interruption. The fuse element 213 can protrude from the connecting piece 211, or its thickness can be less than the thickness of the connecting piece 211, ensuring rapid melting under specific conditions. Thus, when the battery temperature is too high or a short circuit occurs, the fuse element 213 will first reach its melting point, thereby interrupting the circuit and preventing current from continuing to flow through that path, effectively preventing further deterioration of the battery.

[0082] By employing the fuse element 213, this technical solution can promptly cut off the current and reduce the overall temperature of the battery, thereby significantly reducing safety hazards such as fire and explosion. Of course, this protection mechanism is not only applicable to ternary lithium batteries but can also be extended to other new battery technologies to improve the safety and reliability of the entire battery system.

[0083] In summary, the crucial role of the fuse element 213 in ternary lithium batteries not only enhances their resilience to abnormal operating conditions but also lays a solid foundation for improving the safety of the battery system, thus promoting the widespread application of ternary lithium batteries in electric vehicles, portable electronic devices, and other fields.

[0084] In one embodiment, the connecting structure 210 is further provided with a through hole 2114, which is spaced apart from the first connecting hole 2111 and the second connecting hole 2112. Along the radial direction of the connecting piece 211, the through hole 2114 is located between the first connecting hole 2111 and the second connecting hole 2112. This design effectively ensures the confluence function of the connecting piece 211. At the same time, by providing the through hole 2114, a smaller connection area can be achieved between the connecting piece 211 and the peripheral portion 212, thereby enhancing the response sensitivity of the fuse portion 213.

[0085] With this design, when the current of the terminal structure 200 exceeds the preset range, the presence of the through hole 2114 not only reduces the heat accumulation effect of the connecting piece 211, but also helps the fuse part 213 to quickly reach the melting condition, effectively preventing the battery from thermal runaway due to overload. In specific implementations, the shape of the through hole 2114 can be circular, elliptical, or square.

[0086] The introduction of through hole 2114 not only effectively reduces the contact area between connecting piece 211 and peripheral part 212, thereby improving the protection performance of fuse part 213 under abnormal conditions, but also reduces the heat accumulation of current on connecting piece 211 under normal working conditions, preventing potential faults caused by high temperature between connection parts.

[0087] Furthermore, in one embodiment, the number of through holes 2114 can be set to two, and these two through holes 2114 can be symmetrically arranged, staggered with the first connecting hole 2111 and the second connecting hole 2112 respectively. This layout design makes the connecting piece 211 more uniform under stress, thereby improving the fusing effect.

[0088] Furthermore, the connecting piece 211 is provided with a reinforcing rib 2113, which protrudes outward from the surface of the connecting piece 211. This design not only enhances the structural strength of the connecting piece 211, but also improves its stability under mechanical stress and thermal deformation.

[0089] In specific implementations, the reinforcing ribs 2113 can be multiple ribs evenly distributed along the length of the connecting piece 211. This design effectively increases the rigidity of the connecting piece 211 and disperses the force, preventing deformation or breakage under extreme working conditions such as high temperature and high pressure. The advantage of using reinforcing ribs 2113 is that it significantly reduces fatigue damage to the connecting piece 211 under high loads, thereby improving the reliability of the entire connection structure 210. Simultaneously, while ensuring the lightweight design of the connecting piece 2111, the reinforcing ribs 2113 also reduce safety hazards in the event of an accident. Furthermore, the shape of the reinforcing ribs 2113 can be rectangular, triangular, or other geometric shapes to adapt to different design needs and applications.

[0090] Specifically, see Figure 4 As shown, the height d1 of the reinforcing rib 2113 protruding from one side surface of the connecting piece 211 is set between 0.1mm and 1.5mm. This height range is chosen to improve the functional effect and material load-bearing capacity of the reinforcing rib 2113. When the height is less than 0.1mm, the reinforcing effect of the reinforcing rib 2113 is poor, making it difficult to effectively improve the stiffness and strength of the connecting piece 211; while when the height exceeds 1.5mm, the stamping process of the material will face greater challenges, easily causing breakage problems, and increasing the pressure on space utilization, affecting the overall design efficiency of the connecting structure 210. It should be noted that the protrusion height d1 can be 0.1mm, 0.8mm, 1mm, or 1.5mm, specifically determined according to the design requirements of the single cell 10, and is not limited to a single value here.

[0091] In specific implementations, the diverse designs of the reinforcing ribs 2113 can effectively improve their functionality. For example, the reinforcing ribs 2113 can adopt a beveled design or be arranged in multiple parallel ribs. This not only increases the overall strength of the connecting piece 211 but also optimizes material utilization, playing an important role in lightweight design. In addition, considering the needs of different application scenarios, the position and number of the reinforcing ribs 2113 can also be adjusted according to the actual situation to achieve targeted reinforcement effects.

[0092] In one embodiment, there are four fuse portions 213, and the ends of all four fuse portions 213 are connected to the reinforcing rib 2113, with the other ends of the four fuse portions 213 extending toward the edge of the connecting piece 211. This design ensures a good connection between the fuse portions 213 and the connecting structure 210, enabling the fuse portions 213 to react quickly and effectively cut off the circuit in the event of thermal runaway in the single battery cell 10.

[0093] In this embodiment, four fuse elements 213 are evenly distributed on the connecting structure 210, allowing stress and heat to be reasonably dispersed among them. In the event of overheating or thermal runaway, the fuse elements 213 can respond efficiently and uniformly, ensuring that each fuse element 213 functions in the shortest possible time, thereby protecting the safety of the individual battery cell 10 and the entire battery system. This uniform distribution avoids single-fuse-point failure due to localized overheating, improving the overall reliability and stability. In other embodiments, the number of fuse elements 213 can be two, three, or more; this is not a limitation. Multiple fuse elements 213 evenly distributed on the connecting structure 210 can effectively improve the protection efficiency of the electrode structure 200.

[0094] Specifically, the thickness d2 of the connecting piece 211 is set between 0.05mm and 1.5mm to balance the strength and practicality of the connecting piece 211. When the thickness is less than 0.05mm, the strength of the connecting piece 211 is insufficient, making it prone to deformation during welding, resulting in a decrease in welding quality and affecting overall performance. Conversely, when the thickness exceeds 1.5mm, the connection between the connecting piece 211 and the terminal sleeve 220 becomes difficult, increasing the physical space occupied, reducing space utilization, and potentially increasing the weight of the overall structure. It should be noted that the thickness d2 of the connecting piece 211 can be 0.05mm, 0.25mm, 0.8mm, or 1.5mm, depending on the design requirements of the single cell 10, and is not limited to a single value here.

[0095] In this case, different material combinations and designs can be considered to optimize the thickness of the connecting piece 211. For example, the connecting piece 211 can be made of a high-strength alloy material, allowing sufficient strength and stability to be maintained even when it is relatively thin. Furthermore, in specific implementations, it can be designed as a multi-layer structure, that is, using a multi-layer stacking method, achieving high strength and lightweight through the combination of thin-layer materials. This not only effectively improves the yield during welding but also enhances the reliability of the connecting piece 211 while maintaining space utilization.

[0096] In one embodiment, the orthographic projection width d3 of the peripheral portion 212 on the electrode sleeve 220 is set between 0.5mm and 3mm to ensure the yield of the welding process and the feasibility of the manufacturing process. When the width is less than 0.5mm, the welding yield will decrease, thereby affecting the overall quality and reliability of the product. If the width exceeds 3mm, it will cause material waste, increasing production costs and burdening the environment. Therefore, reasonably controlling the width of the peripheral portion 212 is an important measure to improve welding yield and material utilization. It should be noted that the orthographic projection width d3 can be 0.5mm, 1.0mm, 1.5mm, or 3mm, and is determined according to the design requirements of the single cell 10, and is not limited to a single value here.

[0097] Furthermore, in one embodiment, the opening edge of the receiving cavity 221 of the electrode sleeve 220 facing the cell body 320 may be designed with rounded corners. This design optimizes the orthographic projection width d3 of the peripheral portion 212 on the electrode sleeve 220. Specifically, the distance between the outer edge of the peripheral portion 212 and the rounded corner edge of the receiving cavity 221 constitutes its width. In this design, the rounded corners effectively disperse stress, reducing stress concentration problems that may occur during welding. This rounded corner design not only improves the reliability of welding but also reduces potential damage caused by sharp edges.

[0098] See Figure 7As shown, the first connecting hole 2111 and the second connecting hole 2112 are arranged sequentially along the first direction. The dimension of the connecting piece 211 in the first direction is d, while the dimension d4 of the peripheral portion 212 in the first direction should be set between 0.5mm and 1 / 2d. The rationale for this design is that when the dimension d4 of the peripheral portion 212 is less than 0.5mm, it may cause severe deformation of the connecting piece 211 and the pole sleeve 220 during the welding process, resulting in poor welding quality. In severe cases, it may even affect the connection stability of the pole tab 310, leading to functional failure.

[0099] Therefore, to avoid deformation during the welding process, the dimension d4 of the peripheral portion 212 must be designed within a suitable range to ensure the stability and reliability of the weld. Furthermore, different materials and surface treatments can be considered in specific embodiments. For example, aluminum alloy with good weldability can be selected as the material for the connecting piece 211, or an anti-oxidation coating can be applied to the surface of the peripheral portion 212 to improve the contact quality and strength during welding.

[0100] See Figure 4 and Figure 6 As shown, in one embodiment, the terminal post structure 200 further includes an insulating sheet 240 disposed between the terminal post structure 200 and the battery casing 100. The insulating sheet 240 can be injection molded from an insulating material, effectively achieving electrical insulation between the terminal post and the casing. This design not only improves the overall safety of the terminal post structure 200 but also prevents the risk of short circuits caused by static electricity or other electrical interference, ensuring the stability and reliability of the battery system.

[0101] For the material selection of the insulating sheet 240, thermoplastics with good insulating properties such as polypropylene (PP) and polyurethane (PU) can be considered. These materials also possess excellent temperature resistance and chemical stability, enabling them to withstand the high temperatures and corrosion during battery operation. Using injection molding not only ensures a more precise and fitting shape for the insulating sheet but also effectively reduces production costs and improves production efficiency.

[0102] Furthermore, the thickness and shape of the insulating sheet 240 can be adjusted according to specific application requirements to adapt to the heat dissipation requirements and operating environment of different battery designs. For example, the edges of the insulating sheet 240 can be designed to be corrugated or serrated to enhance the contact effect with the casing and further improve insulation performance and structural stability.

[0103] Through this specific implementation plan, the insulating sheet 240 not only enhances the electrical insulation effect of the electrode structure 200, but also provides better mechanical support in the overall structure, thereby ensuring the safety and long service life of the battery system.

[0104] In one embodiment, the pole post structure 200 further includes a fixing piece 260, which is sleeved on the outside of the pole post sleeve 220, and an insulating piece 240 is at least partially sleeved on the outside of the fixing piece 260. The fixing piece 260 may be made of a metal material, such as aluminum alloy or stainless steel. This choice not only provides good conductivity but also improves the connection reliability of the pole post structure 200.

[0105] By making close contact with the terminal sleeve 220, the retaining plate 260 increases the conductive area of ​​the terminal structure 200, thereby significantly improving current transmission efficiency and overall conductivity. This design reduces resistance loss and improves the performance and energy conversion efficiency of the single cell 10. Furthermore, in terms of mechanical strength, the metal retaining plate 260 provides more robust support, ensuring the stability of the terminal structure 200 under high temperature and high vibration environments, thus improving the durability of the single cell 10.

[0106] Another specific implementation is that the surface of the fixing plate 260 can be treated, such as anodizing or nickel plating, which can enhance its corrosion resistance, reduce oxidation and corrosion problems caused by environmental factors during use, and further extend the service life of the pole structure 200.

[0107] Furthermore, the outer wall of the pole sleeve 220 is provided with a mounting groove 224, and the fixing piece 260 is at least partially embedded in the mounting groove 224. This design allows the fixing piece 260 to more effectively engage with the pole sleeve 220, which not only improves the stability of the structure but also simplifies the assembly process. By embedding the fixing piece 260 into the mounting groove 224, a tighter fit can be achieved, enhancing the overall strength of the connection and thus improving the seismic resistance and durability of the pole structure 200.

[0108] In a specific implementation, the mounting groove 224 can be designed as a recess to facilitate the positioning and fixing of the fixing piece 260. This design makes the installation process more convenient and improves production efficiency. At the same time, the depth and width of the mounting groove 224 can be adjusted according to actual application needs to accommodate fixing pieces 260 of different thicknesses and shapes, ensuring good fastening performance in various operating environments.

[0109] In terms of advantages, this design not only improves the conductivity and connection reliability of the electrode structure 200, but also reduces potential maintenance needs to a certain extent. Because the fixing plate 260 effectively disperses external forces, the structural integrity is maintained even in extreme environments, extending the overall lifespan of the individual battery 10. Furthermore, the integrated mounting slot 224 design facilitates later assembly and maintenance, reducing the complexity of production and maintenance.

[0110] See Figure 4 and Figure 6 As shown, in one embodiment, the terminal post structure 200 further includes a sealing gasket 250, which is disposed between the terminal post structure 200 and the battery casing 100. The sealing gasket 250 is designed to achieve multiple functions such as preventing leakage, dust prevention, and corrosion resistance, ensuring the safety and stability of the single battery cell 10 under various operating environments.

[0111] The sealing gasket 250 can be made of flexible materials such as silicone, rubber, or thermoplastic elastomers. These materials have good elasticity and abrasion resistance, maintaining a good seal during compression and extrusion, effectively preventing the penetration of liquids or solid particles. Furthermore, the thickness and hardness of the sealing gasket 250 can be adjusted according to requirements to adapt to different application environments, further enhancing sealing performance.

[0112] In practical implementation, the edges of the sealing gasket 250 can be designed as corrugated or grooved to provide a larger contact area and better sealing effect. This design can effectively increase contact pressure, ensuring a good seal even under extreme conditions. Sealing gaskets with this corrugated structure can be used in negative or positive pressure environments, enhancing their applicability.

[0113] By introducing the sealing gasket 250, not only is the sealing performance of the terminal structure 200 improved, reducing the risk of leakage during use, but the lifespan of the individual battery 10 is also extended. Furthermore, the sealing gasket effectively isolates the intrusion of external environmental factors, ensuring the stability of the internal environment of the individual battery 10, thereby guaranteeing the performance and safety of the individual battery 10.

[0114] Specifically, the terminal sleeve 220 also includes a flange 223, which is located on the outer side of the terminal sleeve 220 and on the inner side of the battery housing 100, at least partially abutting against the inner wall of the battery housing 100. This design effectively enhances the sealing and stability of the terminal structure 200. The sealing gasket 250 is fitted onto the outer side of the terminal sleeve 220 and abuts against the flange 223, thereby forming a multi-layered sealing structure, further improving the ability to prevent leakage and dust.

[0115] In practice, the flange 223 can be designed in an annular or polygonal shape to conform to the inner contour of the battery casing 100, thereby ensuring a uniform contact surface and minimizing potential leakage points. The sealing gasket 250 can be made of special materials, such as self-adhesive silicone or fluororubber, which have excellent elasticity and heat resistance, and can maintain good sealing performance in high or low temperature environments.

[0116] In some embodiments, the single cell 10 can be cylindrical, blade-shaped, or a VDA standard cell. By setting the terminal structure 200 to cooperate with the battery casing 100, the safety and reliability of the single cell 10 can be effectively improved.

[0117] The present invention also provides an electrical device, which includes an electrical device and a battery assembly. The battery assembly includes multiple sets of individual batteries 10 as described in any of the above embodiments. The multiple individual batteries 10 are connected in parallel or in series and electrically connected to the electrical device.

[0118] It is understood that in the electrical device of this embodiment, by setting up a battery assembly having a single cell 10 in any of the above embodiments, the single cell 10 of this embodiment optimizes the spatial layout of the single cell 10 and improves the overall space utilization efficiency by setting a receiving cavity 221 in the electrode structure 200 and realizing the insertion and connection of the tabs 310 of multiple sets of cell structures 300 through the first connecting hole 2111 and the second connecting hole 2112. At the same time, by configuring the tabs 310 in the receiving cavity 221 on the side away from the cell body 320, the risk of welding slag entering the cell during welding is effectively reduced, thereby reducing the possibility of short circuit and self-discharge abnormalities, and further improving the safety and reliability of the battery assembly and the electrical device.

[0119] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0120] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0121] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0122] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A single cell (10) characterized by, include: The battery casing (100) has terminal holes (110). The pole post structure (200) includes a connecting structure (210) and a pole post sleeve (220). The pole post sleeve (220) passes through the pole post hole (110) and has a receiving cavity (221) through it. The connecting structure (210) is connected to the pole post sleeve (220) and covers the opening of the receiving cavity (221). The cell structure (300) includes a connected tab (310) and a cell body (320). The cell body (320) is housed within the battery casing (100), and the receiving cavity (221) is located on one side of the cell body (320). The tab (310) passes through the connecting structure (210) and is housed within the receiving cavity (221). The end of the tab (310) away from the cell body (320) is connected to the terminal structure (200). The connection structure (210) has a first connection hole (2111) and a second connection hole (2112) communicating with the receiving cavity (221), and the first connection hole (2111) and the second connection hole (2112) are arranged side by side. The tab (310) passes through the first connection hole (2111) and the second connection hole (2112) respectively and is housed in the receiving cavity (221). The end of the tab (310) away from the cell body (320) is connected to the pole structure (200).

2. The single cell (10) according to claim 1, characterized in that The number of the battery cell structures (300) is multiple sets, and the tabs (310) of the multiple sets of battery cell structures (300) are respectively passed through the first connecting hole (2111) and the second connecting hole (2112) and connected to the connecting structure (210).

3. The single cell (10) according to claim 1, characterized in that The pole sleeve (220) is also provided with a positioning groove (222) communicating with the receiving cavity (221); the pole structure (200) also includes a sealing cover (230), the sealing cover (230) is housed in the positioning groove (222) and covers the opening of the receiving cavity (221) away from the connecting structure (210), and the sealing cover (230) is electrically connected to the pole sleeve (220).

4. The single cell (10) according to claim 3, characterized in that The sealing cover (230) includes a cover base (231) and a cover body (232). The cover body (232) is detachably connected to the cover base (231), and the cover base (231) is housed in the positioning groove (222) and connected to the pole sleeve (220). The cover body (232) is used to connect to an external circuit.

5. The single-cell battery (10) according to claim 4, characterized in that, The outer peripheral wall of the cover (231) is provided with a first positioning inclined surface (2311), and the inner wall of the positioning groove (222) is provided with a second positioning inclined surface (2221). The first positioning inclined surface (2311) and the second positioning inclined surface (2221) are fitted together.

6. The single cell (10) according to claim 1, characterized in that The connection structure (210) includes a connecting piece (211) and a peripheral portion (212). The peripheral portion (212) is located on the outside of the connecting piece (211), and the first connecting hole (2111) and the second connecting hole (2112) are located on the connecting piece (211). The peripheral portion (212) surrounds the connecting piece (211) and encloses the outer openings of the first connecting hole (2111) and the second connecting hole (2112). The peripheral portion (212) is connected to the pole sleeve (220).

7. The single cell (10) according to claim 6, characterized in that The connecting structure (210) further includes a fusible part (213), which is disposed on the connecting piece (211) and between the first connecting hole (2111) and the second connecting hole (2112); the fusible part (213) protrudes from the connecting piece (211) toward the direction away from the receiving cavity (221), or the thickness of the fusible part (213) is less than the thickness of the connecting piece (211).

8. The single-cell battery (10) according to claim 7, characterized in that, The connecting structure (210) is also provided with a through hole (2114), which is spaced apart from the first connecting hole (2111) and the second connecting hole (2112). Along the radial direction of the connecting piece (211), the through hole (2114) is located between the first connecting hole (2111) and the second connecting hole (2112).

9. The single cell (10) according to claim 6, characterized in that The connecting piece (211) is provided with reinforcing ribs (2113), which protrude outward from the surface of the connecting piece (211).

10. The single cell (10) according to claim 9, characterized in that The reinforcing rib (2113) protrudes from one side surface of the connecting piece (211) at a height of 0.1mm-1.5mm.

11. The single cell (10) according to claim 6, characterized in that The thickness of the connecting piece (211) is 0.05mm-1.5mm.

12. The single cell (10) according to claim 6, characterized in that The first connecting hole (2111) and the second connecting hole (2112) are arranged sequentially along the first direction. The dimension of the connecting piece (211) in the first direction is d, and the dimension of the peripheral portion (212) in the first direction is 0.5mm-1 / 2d.

13. The single-cell battery (10) according to claim 6, characterized in that, The width of the orthographic projection of the peripheral portion (212) onto the pole sleeve (220) is 0.5mm-3mm.

14. The single cell (10) according to claim 1, characterized in that The connecting structure (210) is welded and fixed to the pole sleeve (220).

15. The single cell (10) according to any one of claims 1 to 14, characterized in that The pole post structure (200) also includes an insulating sheet (240), which is disposed between the pole post structure (200) and the battery casing (100).

16. The single cell (10) according to claim 15, characterized in that The pole structure (200) further includes a fixing piece (260), which is sleeved on the outside of the pole sleeve (220), and the insulating piece (240) is at least partially sleeved on the outside of the fixing piece (260).

17. The single cell (10) according to claim 16, characterized in that The outer wall of the pole sleeve (220) is provided with an installation groove (224), and the fixing piece (260) is at least partially embedded in the installation groove (224).

18. The monobloc cell (10) according to any one of claims 1 to 14, characterized in that The pole post structure (200) also includes a sealing gasket (250), which is disposed between the pole post structure (200) and the battery casing (100).

19. The individual cell (10) according to claim 18, characterized in that The terminal sleeve (220) also includes a flange (223), which is located on the outside of the terminal sleeve (220) and on the inside of the battery housing (100). The flange (223) at least partially abuts against the inner wall of the battery housing (100). The sealing gasket (250) is sleeved on the outside of the terminal sleeve (220) and abuts against the flange (223).

20. A battery assembly comprising: It includes a plurality of individual cells (10) as described in any one of claims 1-19, wherein the plurality of individual cells (10) are connected in parallel or in series.

21. An electrical device, comprising: include: Electrical appliances; as well as The battery assembly as claimed in claim 20, or the single cell (10) as claimed in any one of claims 1-19, wherein the single cell (10) is electrically connected to the power-consuming device.

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