Cylindrical battery cell, battery pack and electric equipment

Abstract

The utility model discloses a cylindrical battery cell, a battery pack and electric equipment, and relates to the technical field of batteries, and the cylindrical battery cell comprises a shell, a battery cell main body and a cover body assembly. The shell is provided with a containing cavity with an opening in one side. And the battery cell main body is arranged in the shell. The cover body assembly is arranged on one side of the shell, the cover body assembly blocks an opening of the containing cavity, and the cover body assembly comprises an assembly base body and an anti-explosion valve. The assembly base body is fixedly connected with the shell and seals an opening of the containing cavity, an assembly hole is formed in the middle of the assembly base body, the anti-explosion valve is installed in the assembly hole, and the peripheral side of the anti-explosion valve is connected with the inner wall of the assembly hole in a sealed mode. According to the application, the superimposed effect of the initial air pressure and the secondary air pressure can be reduced or even avoided, and the remaining service life of the battery cell is effectively utilized while the safety of the battery cell is ensured.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cylindrical battery cell, a battery pack, and an electrical device. Background Art

[0002] Batteries, such as cylindrical cells, are a key component of modern energy storage. Within the cell manufacturing process, the closed-cell formation and capacity separation processes are particularly critical. This process typically utilizes fully sealed methods, such as welding or upsetting sealing techniques. However, this enclosed environment presents a significant challenge during cell manufacturing and use: the accumulation and fluctuation of air pressure.

[0003] When a cylindrical battery cell enters the closed-end formation and capacity separation phase, a series of complex chemical reactions occur within the cell. These reactions not only promote cell activation and performance improvement, but also form an initial gas pressure within the cell. This initial gas pressure forms the basis for subsequent pressure changes during the cell's use. In actual use, the cell undergoes repeated charge and discharge cycles, which also continuously generate gases. These gases combine with the initial gas pressure formed during the manufacturing process to form a secondary gas pressure. Over time, this secondary gas pressure gradually increases, posing a significant risk to the cell's structure and performance.

[0004] To combat the buildup of gas pressure inside the battery cells, engineers designed an explosion-proof valve as a safety mechanism. When the pressure inside the battery cell reaches or exceeds the valve's preset threshold, the valve automatically opens, releasing excess gas and protecting the battery cell from damage caused by the high pressure.

[0005] However, while this mechanism is effective, it also comes with a significant side effect. In some cases, due to the combined effects of initial and secondary pressure, the pressure inside the battery cell may reach the pressure threshold of the explosion-proof valve before the end of the battery cell's normal service life. In this case, while premature opening of the explosion-proof valve ensures the immediate safety of the battery cell, it also comes at the expense of the remaining service life of the battery cell. Utility Model Content

[0006] The present application provides a cylindrical battery cell, a battery pack, and an electrical device, which can reduce or even avoid the superposition effect of initial air pressure and secondary air pressure, thereby ensuring the safety of the battery cell and effectively utilizing the remaining service life of the battery cell.

[0007] In a first aspect, the present application provides a cylindrical battery cell, which includes a shell, a battery cell body and a cover assembly.

[0008] The housing is provided with a single-sided opening for a receiving cavity. The battery cell body is mounted within the housing. A cover assembly is provided on one side of the housing to seal the opening of the receiving cavity. The cover assembly includes an assembly base and an explosion-proof valve.

[0009] The assembly base is fixedly connected to the shell and closes the opening of the accommodating cavity. An assembly hole is opened in the middle of the assembly base. The explosion-proof valve is installed in the assembly hole. The peripheral side of the explosion-proof valve is sealed with the inner wall of the assembly hole.

[0010] The cover assembly of the present application can be a clamping end cover. Compared with the traditional cap and the existing single-piece cover plate, it allows the battery cell to be formed and divided into volumes in an open manner during the manufacturing process and remove the gas generated in this stage.

[0011] The clamping end cap is used for cylindrical battery cells. An opening can be used during the manufacturing process to carry out formation and capacity separation, and to remove the gas generated in the process. This ensures that the gas pressure generated by the subsequent cylindrical battery cells during use is basically consistent with the pressure threshold of the explosion-proof valve. This avoids the reduction of the gas pressure that reaches the pressure threshold of the explosion-proof valve during use due to the existence of process gas pressure, so that the battery cells do not release pressure prematurely within their normal service life, effectively extending their actual service life.

[0012] The above structure can reduce or even avoid the superposition effect of the initial air pressure and the secondary air pressure, thereby ensuring the safety of the battery cell and effectively utilizing the remaining service life of the battery cell.

[0013] In some examples, the assembly base includes a main body and a connecting part, the main body is an annular structure arranged around the assembly hole, the connecting part is arranged on the inner side of the main body, the explosion-proof valve is connected to the connecting part, and a seal is arranged between the explosion-proof valve and the connecting part.

[0014] The main body of the assembly base is an annular structure surrounding the assembly hole. This ring structure not only provides stable support for the assembly hole but also effectively disperses stress from all directions through its even distribution, thereby ensuring the long-term stability and safety of the assembly hole and surrounding components. Furthermore, the ring structure is designed to maximize space utilization, accommodating more components and connection points within a limited volume, laying a solid foundation for the compactness and efficiency of the device.

[0015] In some examples, the explosion-proof valve is nested with the seal in an adhesively bonded manner.

[0016] Adhesive nesting has the following advantages:

[0017] 1. High-strength seal: A special adhesive creates a strong bond between the explosion-proof valve and the seal, ensuring excellent sealing performance even under extreme operating conditions. This sealing effect far surpasses traditional mechanical compression methods, effectively preventing media leakage and reducing safety hazards.

[0018] 2. Strong corrosion resistance: For corrosive media commonly found in chemical and other industries, the selection of suitable adhesives and sealing materials can greatly improve the corrosion resistance of explosion-proof valves and extend their service life.

[0019] 3. Easy installation: Compared with the traditional sealing method, the nested bonding method simplifies the installation process and reduces the technical requirements of the installation workers. At the same time, due to the reduction in the number of parts, maintenance costs are also reduced.

[0020] In some examples, the sealing member is integrally formed with the explosion-proof valve. Alternatively, the assembly base, the sealing member, and the explosion-proof valve are integrally formed.

[0021] Seals are key components for preventing media leakage, and their performance is directly related to the safe and stable operation of equipment. Explosion-proof valves, as crucial safety devices to prevent explosions caused by excessive internal system pressure, are also essential. Traditionally, seals and explosion-proof valves have been installed as separate components, increasing assembly complexity and potentially creating safety hazards due to poor sealing at the interface. Therefore, integrating seals, explosion-proof valves, and even the assembly base into an integrated design can further improve sealing performance.

[0022] In some examples, before the explosion-proof valve is installed, the connecting portion is an annular structure with a single-side cross-section being an "L"-shaped structure, and forms a receiving groove for receiving the explosion-proof valve.

[0023] After the explosion-proof valve is installed on the connecting part, the groove wall of the receiving groove is bent toward the assembly hole and forms an annular structure with a single-side cross-section of a "C"-shaped structure. The bent connecting part forms an assembly groove, and the assembly groove cooperates with the sealing member to lock and seal the edge position of the explosion-proof valve.

[0024] The connection takes its initial form before the explosion-proof valve is installed. During this stage, it is designed as a ring-shaped structure with a single L-shaped cross-section. This design not only ensures sufficient strength and stability to withstand the gravity and operating pressure of the explosion-proof valve, but also allows space for the subsequent formation of a receiving groove to receive the explosion-proof valve. The receiving groove provides precise positioning and support for the explosion-proof valve during installation, effectively preventing deviation or shaking during installation.

[0025] Once the explosion-proof valve is successfully installed in the connection, the wall of the connection's receiving groove will be precisely bent toward the assembly hole, transforming the original ring structure with a single-side "L" cross-section into a ring structure with a single-side "C" cross-section. This transformation not only enhances the structural strength of the connection, but also creates a brand new assembly groove.

[0026] In some examples, an electrode terminal is provided on the side of the shell facing away from the cover assembly, the electrode terminal passes through the end of the shell and partially extends into the accommodating cavity, a first current collecting disk is provided between the electrode terminal and the battery cell body, a second current collecting disk is provided at the end of the battery cell body close to the cover assembly, and the assembly base is fixedly connected to the second current collecting disk.

[0027] The housing not only serves as the first line of defense against environmental damage but also serves as the supporting framework for the battery's overall structure. Particularly noteworthy are the electrode terminals located on the side of the housing facing away from the cover assembly. These terminals aren't randomly placed; they've been carefully calculated and designed to ensure they precisely penetrate the ends of the housing and partially extend into the housing cavity. This design not only effectively connects the battery to the external circuit but also reduces energy loss by shortening the current path, thereby improving the battery's overall efficiency.

[0028] In some examples, the first current collecting disk is a positive current collecting disk, and the positive electrode tab of the battery cell body is connected to the positive current collecting disk, and the second current collecting disk is a negative current collecting disk, and the negative electrode tab of the battery cell body is connected to the negative current collecting disk.

[0029] The positive electrode collector plate is a key component connecting the battery's positive active material to the external circuit. It's typically made of a highly conductive material, such as copper foil, to ensure efficient and stable current flow from the positive active material. It seamlessly connects the positive electrode tab on the battery cell to the collector plate. This connection requires not only minimal resistance to minimize energy loss but also a large contact area to ensure uniform current distribution, thus avoiding localized overheating and performance degradation.

[0030] The negative electrode current collector, corresponding to the positive electrode current collector, is designed as a secondary current collector, tightly connected to the negative electrode tab of the battery cell. The negative electrode current collector also requires a highly conductive material, such as aluminum foil, to ensure that the current in the negative electrode active material can be smoothly discharged and participate in the battery's charge and discharge cycle. It is worth noting that the design of the negative electrode current collector also needs to consider its chemical stability to resist corrosion from chemical reactions that may occur within the battery, thereby extending the battery's service life.

[0031] In some examples, a plurality of waist-shaped grooves are provided on a side of the assembly base close to the battery cell body, and the waist-shaped grooves are welded and electrically connected to the second current collecting plate.

[0032] The waist-shaped grooves are shaped like the human waist, exhibiting a characteristic curve. This design is not arbitrary, but based on scientific analysis and precise calculations of the battery's internal structure. The width, depth, and spacing of the waist-shaped grooves are rigorously calculated to maximize space utilization while ensuring a perfect fit and weld with the second current collector.

[0033] In a second aspect, the present application provides a battery pack comprising the above-mentioned cylindrical battery cell and a box body, wherein the cylindrical battery cell is arranged in the box body.

[0034] The battery pack with the above-mentioned cylindrical battery cell can reduce or even avoid the superposition effect of the initial gas pressure and the secondary gas pressure, ensuring the safety of the battery cell while effectively utilizing the remaining service life of the battery cell. Specifically, the clamping end cap is used for the cylindrical battery cell, and an opening method can be used during the process to carry out formation and capacity separation, and remove the gas generated in the process, so that the gas pressure generated by the subsequent cylindrical battery cell during use is basically consistent with the pressure threshold of the explosion-proof valve, avoiding the reduction of the gas pressure that reaches the pressure threshold of the explosion-proof valve during use due to the existence of process gas pressure, so that the battery cell does not release pressure prematurely within the normal service life range, effectively extending the actual service life of the battery cell.

[0035] In a third aspect, the present application provides an electrical device, comprising the above-mentioned battery pack and a device body, wherein the battery pack is arranged in the device body.

[0036] Electrical equipment with the above-mentioned battery pack can reduce or even avoid the superposition effect of initial gas pressure and secondary gas pressure, ensuring the safety of the battery cell while effectively utilizing the remaining service life of the battery cell. Specifically, the clamping end cap is used for cylindrical battery cells, and an opening method can be used during the process to carry out formation and capacity separation, and remove the gas generated in the process, so that the gas pressure generated by the subsequent cylindrical battery cell during use is basically consistent with the pressure threshold of the explosion-proof valve, avoiding the reduction of the gas pressure that reaches the pressure threshold of the explosion-proof valve during use due to the existence of process gas pressure, so that the battery cell does not release pressure prematurely within the normal service life range, effectively extending the actual service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in this application or the prior art, the following briefly introduces the drawings required for use in the examples or descriptions of the prior art. Obviously, the drawings described below are only some examples of this application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 This is a schematic diagram of the structure of a cylindrical battery cell in an example of this application.

[0039] Figure 2 This is a schematic diagram of the side structure of a cylindrical battery cell in an example of the present application.

[0040] Figure 3 for Figure 2 Schematic diagram of the structural cross-section of the medium cylindrical battery cell in the AA direction.

[0041] Figure 4 for Figure 3 A partial enlarged schematic diagram of the medium cylindrical battery cell at point A.

[0042] Figure 5 This is a partial cross-sectional schematic diagram of a cylindrical battery cell in an example of the present application before the connection portion on the assembly base is locked with the explosion-proof valve.

[0043] Figure 6 This is a partial cross-sectional schematic diagram of a cylindrical battery cell in an example of the present application after the connection portion on the assembly base is locked with the explosion-proof valve.

[0044] Figure 7 This is a schematic top view of a cover assembly in a cylindrical battery cell in an example of the present application.

[0045] Figure 8 This is a schematic top view of a cylindrical battery cell in an example of the present application.

[0046] Figure 9 for Figure 3 A partial enlarged schematic diagram of the middle cylindrical battery cell at point B.

[0047] Reference numerals:

[0048] 100. Shell; 110. Accommodating cavity; 120. First collecting disc; 130. Second collecting disc; 200. Battery cell body; 300. Cover assembly; 310. Assembly base; 311. Main body; 312. Connecting portion; 313. Assembly hole; 314. Receiving groove; 315. Assembly groove; 320. Explosion-proof valve; 330. Sealing member; 340. Waist-shaped groove; 400. Electrode terminal; 410. Sealing gasket; 420. Insulating member. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain this application and are not intended to limit this application.

[0050] To solve the above technical problems, please refer to Figures 1-9 As shown, the first aspect of the present application proposes a cylindrical battery cell, which can reduce or even avoid the superposition effect of the initial gas pressure and the secondary gas pressure, thereby ensuring the safety of the battery cell and effectively utilizing the remaining service life of the battery cell.

[0051] Reference Figure 1-Figure 4 As shown, in some examples, the cylindrical battery cell includes a housing 100 , a battery cell body 200 , and a cover assembly 300 .

[0052] The housing 100 is provided with a receiving cavity 110 with a single-side opening. The battery cell body 200 is installed in the housing 100. The cover assembly 300 is provided on one side of the housing 100, sealing the opening of the receiving cavity 110. The cover assembly 300 includes an assembly base 310 and an explosion-proof valve 320.

[0053] The assembly base 310 is fixedly connected to the housing 100 and closes the opening of the accommodating chamber 110 . An assembly hole 313 is opened in the middle of the assembly base 310 . The explosion-proof valve 320 is installed in the assembly hole 313 . The peripheral side of the explosion-proof valve 320 is sealed to the inner wall of the assembly hole 313 .

[0054] The cover assembly 300 of the present application can be a clamping end cover. Compared with the traditional cap and the existing single-piece cover plate, it allows the battery cell to be formed and divided into volumes in an open manner during the manufacturing process and remove the gas generated in this stage.

[0055] The clamping end cap is used for cylindrical battery cells. An opening can be used during the manufacturing process to carry out formation and capacity separation, and to remove the gas generated in the process, so that the gas pressure generated by the subsequent cylindrical battery cells during use is basically consistent with the pressure threshold of the explosion-proof valve 320, avoiding the reduction of the gas pressure that reaches the pressure threshold of the explosion-proof valve 320 during use due to the existence of the process gas pressure, so that the battery cells will not be depressurized prematurely within the normal service life, effectively extending the actual service life of the battery cells.

[0056] The above structure can reduce or even avoid the superposition effect of the initial air pressure and the secondary air pressure, thereby ensuring the safety of the battery cell and effectively utilizing the remaining service life of the battery cell.

[0057] The housing 100 serves as the framework for the cylindrical battery cell, and its interior includes a single-sided opening for a receiving chamber 110. This design not only provides stable support and protection for the battery cell body 200, but also reserves space for subsequent assembly and maintenance. In practice, this single-sided opening helps simplify the production process, improves assembly efficiency, and greatly facilitates battery cell maintenance and replacement.

[0058] The cell body 200, the core component of the battery cell, is meticulously installed within the housing 110 of the housing 100. It carries the heavy responsibility of storing and releasing electrical energy, and its stable performance directly impacts the efficiency of the entire cylindrical battery cell. To ensure the efficient operation of the cell body 200, the manufacturer has conducted in-depth research and optimization in material selection, structural design, and production processes, striving for perfection in every detail.

[0059] The above-mentioned structure of the present application has a unique cover assembly 300 design. Compared with traditional caps and existing single-piece cover plates, the clamping end caps used in this application have significant advantages. This design allows the battery cells to be formed and divided into different volumes using an open method during the manufacturing process. This innovative move not only simplifies the production process, but also greatly improves the production efficiency of the battery cells. More importantly, it can effectively remove the gases generated inside the battery cells during the formation and division stages, thereby avoiding the adverse effects of these gases on the subsequent performance of the battery cells.

[0060] Specifically, the clamping end cap is fixedly connected to the housing 100 via its unique mounting base 310, tightly sealing the opening of the accommodating chamber 110. A mounting hole 313 is provided in the center of the mounting base 310 for mounting an explosion-proof valve 320. This design ensures the sealing of the battery cell while also allowing for regulation of its internal pressure. If internal gas pressure builds up in the battery cell for various reasons during use, the explosion-proof valve 320 quickly responds and releases excess pressure, ensuring safe operation of the cell.

[0061] It's worth noting that the clamping end cap design also ensures that the gas pressure generated during battery cell use is essentially consistent with the pressure threshold of explosion-proof valve 320. This feature effectively prevents the pressure of the gas generated during use, which reaches the pressure threshold of explosion-proof valve 320, from being reduced due to process pressure. In other words, it ensures that the battery cell will not prematurely release pressure due to excessive internal pressure within its normal service life, thereby effectively extending the actual service life of the battery cell.

[0062] Reference Figure 4-Figure 6 As shown, in some examples, the assembly base 310 includes a main body 311 and a connecting portion 312, the main body 311 is an annular structure arranged around the assembly hole 313, the connecting portion 312 is arranged on the inner side of the main body 311, the explosion-proof valve 320 is connected to the connecting portion 312, and a seal 330 is arranged between the explosion-proof valve 320 and the connecting portion 312.

[0063] The main body 311 of the assembly base 310 is an annular structure surrounding the assembly hole 313. This annular structure not only provides stable support for the assembly hole 313 but also effectively disperses stress from all directions through its even distribution, thereby ensuring the long-term stability and safety of the assembly hole 313 and surrounding components. Furthermore, the annular structure is designed to maximize space utilization, accommodating more components and connection points within a limited volume, laying a solid foundation for the compactness and efficiency of the device.

[0064] Connector 312 serves as a bridge between the main body 311 and the explosion-proof valve 320, and its role cannot be underestimated. Located inside the main body 311, it ensures a tight connection with the main body 311 while leaving ample space for the installation of the explosion-proof valve 320. The design of connector 312 often incorporates multiple advanced manufacturing processes and materials science to ensure it can withstand the high pressure shocks and complex operating environment of the explosion-proof valve 320.

[0065] The primary function of the seal 330 between the explosion-proof valve 320 and the connection 312 is to prevent the leakage of gases, liquids, or solid particles between the explosion-proof valve 320 and the connection 312. To achieve this, the seal 330 is typically made of a high-performance elastic material, such as fluororubber or silicone rubber. These materials not only provide excellent sealing properties but also maintain stable performance in extreme operating environments. Furthermore, the design of the seal 330 takes into account ease of installation and replacement, enabling quick completion when necessary, reducing equipment maintenance costs and time.

[0066] Reference Figure 4-Figure 6 As shown, in some examples, explosion proof valve 320 is nested with seal 330 in an adhesively bonded manner.

[0067] Adhesive nesting has the following advantages:

[0068] 1. High-strength seal: A special adhesive creates a strong bond between explosion-proof valve 320 and seal 330, ensuring excellent sealing performance even under extreme operating conditions. This sealing effect far surpasses traditional mechanical compression methods, effectively preventing media leakage and reducing safety risks.

[0069] 2. Strong corrosion resistance: For corrosive media commonly found in chemical and other industries, the selection of suitable adhesives and sealing materials can greatly improve the corrosion resistance of the explosion-proof valve 320 and extend its service life.

[0070] 3. Easy installation: Compared with the traditional sealing method, the nested bonding method simplifies the installation process and reduces the technical requirements of the installation workers. At the same time, due to the reduction in the number of parts, maintenance costs are also reduced.

[0071] In some examples, the sealing member 330 is integrally formed with the explosion-proof valve 320. Alternatively, the assembly base 310, the sealing member 330, and the explosion-proof valve 320 are integrally formed.

[0072] As a key component for preventing media leakage, the performance of seal 330 is directly related to the safe and stable operation of the equipment. The explosion-proof valve 320, a crucial safety device for preventing explosions caused by excessive internal system pressure, is also indispensable. In traditional designs, seal 330 and explosion-proof valve 320 are often installed as separate components. This not only increases assembly difficulty but can also pose safety risks due to poor sealing performance at the interface. Therefore, integrating seal 330 with explosion-proof valve 320 and even assembly base 310 into an integrated design can further improve sealing performance.

[0073] The above-mentioned all-in-one setup has the following advantages:

[0074] 1. Improved Sealing Performance: The one-piece design eliminates the interface gap between the seal 330 and the explosion-proof valve 320 in traditional designs, effectively preventing the possibility of media leakage through these tiny gaps. This design greatly improves the sealing performance of the equipment and reduces the risk of safety accidents caused by leakage.

[0075] 2. Enhanced structural strength: By integrating the seal 330, explosion-proof valve 320, and assembly base 310 into a single unit, designers can more rationally allocate materials and optimize the structural layout. This design not only reduces the weight of the equipment but also significantly improves the strength and rigidity of the overall structure, enabling the equipment to maintain stable operation even in harsh operating conditions.

[0076] 3. Simplified assembly process: The one-piece design simplifies the equipment assembly process, reduces the number of parts, and reduces assembly difficulty and cost. At the same time, by reducing the number of connection points and potential sources of failure during the assembly process, the reliability and maintainability of the equipment are also improved.

[0077] 4. Improved safety: In equipment involving flammable and explosive media, the one-piece explosion-proof valve 320 responds more quickly and accurately to changes in internal system pressure, effectively preventing explosions. Furthermore, improved sealing performance further reduces the risk of fire and explosion.

[0078] Reference Figure 4-Figure 7 As shown, in some examples, before the explosion-proof valve 320 is installed, the connecting portion 312 is an annular structure with a single-side cross-section being an “L”-shaped structure, and forms a receiving groove 314 for receiving the explosion-proof valve 320 .

[0079] After the explosion-proof valve 320 is installed, the groove wall of the receiving groove 314 of the connecting part 312 is bent toward the direction of the assembly hole 313 and forms an annular structure with a single-side cross-section of a "C"-shaped structure. The bent connecting part 312 forms an assembly groove 315, and the assembly groove 315 cooperates with the sealing part 330 to lock and seal the edge position of the explosion-proof valve 320.

[0080] Before explosion-proof valve 320 is installed, connection portion 312 assumes its initial form. At this stage, connection portion 312 is designed as a ring structure with a single L-shaped cross-section. This design not only ensures that connection portion 312 maintains sufficient strength and stability despite the weight and operating pressure of explosion-proof valve 320, but also allows space for the subsequent formation of receiving groove 314 to receive explosion-proof valve 320. The presence of receiving groove 314 provides precise positioning and support for explosion-proof valve 320 during installation, effectively preventing deviation or shaking during installation.

[0081] Once the explosion-proof valve 320 is successfully installed on the connecting portion 312, the wall of the receiving groove 314 of the connecting portion 312 will be precisely bent toward the assembly hole 313, transforming the original ring structure with a single-side "L" cross-section into a ring structure with a single-side "C" cross-section. This transformation not only enhances the structural strength of the connecting portion 312 but also creates a new assembly groove 315.

[0082] The presence of assembly groove 315 is a key design feature of connector 312. It closely mates with seal 330, securing and sealing the edges of explosion-proof valve 320 through a precise locking mechanism. This process ensures the valve's sealing performance in extreme environments, such as high pressure and high temperature, effectively preventing gas or liquid leakage and thus ensuring safe operation of the entire production line.

[0083] Reference Figure 8-Figure 9 As shown, in some examples, an electrode terminal 400 is provided on the side of the shell 100 facing away from the cover assembly 300, the electrode terminal 400 passes through the end of the shell 100 and partially extends into the accommodating cavity 110, a first current collecting disk 120 is provided between the electrode terminal 400 and the battery cell body 200, a second current collecting disk 130 is provided at the end of the battery cell body 200 close to the cover assembly 300, and the assembly base 310 is fixedly connected to the second current collecting disk 130.

[0084] The housing 100 is not only the first line of defense protecting the internal components from the external environment, but also the supporting framework of the overall battery structure. Particularly noteworthy is the fact that electrode terminals 400 are provided on the side of the housing 100 facing away from the cover assembly 300. These electrode terminals 400 are not randomly placed, but are carefully calculated and designed to ensure that they can accurately penetrate the ends of the housing 100 and partially extend into the accommodating cavity 110. This design not only achieves an effective connection between the battery and the external circuit, but also reduces energy loss by shortening the current path, thereby improving the overall efficiency of the battery.

[0085] Next, let's delve deeper into the key connection between the electrode terminal 400 and the battery cell body 200—the first current collecting disc 120. As a bridge for current transmission, the material, thickness, shape, and even the contact method with the electrode terminal 400 and the battery cell body 200 of the first current collecting disc 120 are directly related to the performance of the battery. A high-quality first current collecting disc 120 can ensure low impedance and high stability during current transmission, thereby effectively avoiding safety hazards such as overheating and short circuits. At the same time, the design of the first current collecting disc 120 must also fully consider heat dissipation performance to ensure that the internal temperature of the battery can be effectively controlled under high-intensity operating conditions, thereby ensuring the long life and reliability of the battery.

[0086] A second current collecting disc 130 is provided at the other end of the battery cell body 200. Echoing the first current collecting disc 120, the second current collecting disc 130 also undertakes the important task of current transmission and distribution. However, unlike the first current collecting disc 120, the second current collecting disc 130 also undertakes the important task of fixed connection with the assembly base 310. This connection method not only enhances the stability of the battery structure, but also helps to improve the impact resistance of the battery in harsh environments such as vibration and impact. In addition, by optimizing the contact interface between the second current collecting disc 130 and the assembly base 310, the contact resistance can be further reduced, the current transmission efficiency can be improved, and the overall performance of the battery can be improved.

[0087] The electrode terminal 400 and the housing 100 are supported by a sealing gasket 410 and an insulating member 420. The insulating member 420 can isolate the electrode terminal 400 from the housing 100. The housing 100 can serve as the negative electrode of the entire battery cell, and the motor terminal can serve as the positive electrode of the entire battery cell. The sealing gasket 410 can ensure the sealing of the housing cavity 110 within the housing 100.

[0088] In some examples, the first current collecting disk is a positive current collecting disk, and the positive electrode tab of the battery cell body 200 is connected to the positive current collecting disk, and the second current collecting disk is a negative current collecting disk, and the negative electrode tab of the battery cell body 200 is connected to the negative current collecting disk.

[0089] The positive current collector is a key connection between the battery's positive active material and the external circuit. It's typically made of a material with excellent conductivity, such as copper foil, to ensure efficient and stable current flow from the positive active material. It seamlessly connects the positive tab of the battery cell 200 to the positive current collector. This connection requires not only minimal resistance to minimize energy loss but also a large contact area to ensure uniform current distribution, thereby avoiding localized overheating or performance degradation.

[0090] The negative electrode current collector, corresponding to the positive electrode current collector, serves as a secondary current collector and is tightly connected to the negative electrode tab of the battery cell 200. The negative electrode current collector must also be made of a highly conductive material, such as aluminum foil, to ensure that the current in the negative electrode active material can be smoothly discharged and participate in the battery's charge and discharge cycles. It is worth noting that the design of the negative electrode current collector must also consider its chemical stability to resist corrosion from chemical reactions that may occur within the battery, thereby extending the battery's service life.

[0091] To more intuitively understand this process, imagine the microscopic world inside a battery. When the battery is discharged, lithium ions in the positive electrode active material migrate through the electrolyte to the surface of the negative electrode and embed into the negative electrode active material. Simultaneously, electrons flow through the positive electrode current collector, the positive electrode tab, the external circuit, the negative electrode tab, and the negative electrode current collector, forming a complete current loop. During this process, the conductivity and contact quality of the current collector directly determine the magnitude and stability of the current, which in turn affects the overall performance of the battery.

[0092] Furthermore, with the continuous advancement of battery technology, the requirements for current collector plates are becoming increasingly stringent. To improve the energy density and cycle stability of batteries, new materials and technologies for current collector plates can be employed. For example, current collector plates employing porous structures or nanotechnology can increase the contact area with the active material, improving current transmission efficiency. Surface modification techniques can enhance the chemical stability and corrosion resistance of current collector plates, thereby extending the battery's service life.

[0093] In some examples, a plurality of waist-shaped grooves 340 are provided on a side of the assembly base 310 close to the battery cell body 200 , and the waist-shaped grooves 340 are welded and electrically connected to the second current collecting plate 130 .

[0094] The waist-shaped groove 340 is shaped like the human waist, exhibiting a characteristic curve. This design is not arbitrary, but is based on scientific analysis and precise calculations of the battery's internal structure. The width, depth, and spacing of the waist-shaped groove 340 are carefully calculated to maximize space utilization while ensuring a perfect fit and weld with the second current collecting plate 130.

[0095] Welding the waist-shaped groove 340 to the second current collecting plate 130 is a key step in this design. Traditional welding methods often face problems such as loose connections and excessive resistance, but the waist-shaped groove 340 design effectively solves these problems. The special shape of the groove creates a larger contact area during welding, thereby improving the strength and stability of the weld. This design also helps reduce resistance during the welding process, allowing for smoother current transmission, reducing energy loss, and improving the overall efficiency of the battery.

[0096] In a second aspect, the present application provides a battery pack comprising the above-mentioned cylindrical battery cell and a box body, wherein the cylindrical battery cell is arranged in the box body.

[0097] The battery pack with the above-mentioned cylindrical battery cell can reduce or even avoid the superposition effect of the initial gas pressure and the secondary gas pressure, ensuring the safety of the battery cell while effectively utilizing the remaining service life of the battery cell. Specifically, the clamping end cap is used for the cylindrical battery cell, and an opening method can be used during the process to carry out formation and capacity separation, and remove the gas generated in the process, so that the gas pressure generated by the subsequent cylindrical battery cell during use is basically consistent with the pressure threshold of the explosion-proof valve 320, avoiding the reduction of the gas pressure that reaches the pressure threshold of the explosion-proof valve 320 during use due to the existence of process gas pressure, so that the battery cell does not release pressure prematurely within the normal service life range, effectively extending the actual service life of the battery cell.

[0098] In a third aspect, the present application provides an electrical device, comprising the above-mentioned battery pack and a device body, wherein the battery pack is arranged in the device body.

[0099] Electrical equipment with the above-mentioned battery pack can reduce or even avoid the superposition effect of initial gas pressure and secondary gas pressure, ensuring the safety of the battery cell while effectively utilizing the remaining service life of the battery cell. Specifically, the clamping end cap is used for cylindrical battery cells, and an opening method can be used during the process to carry out formation and capacity separation, and remove the gas generated in the process, so that the gas pressure generated by the subsequent cylindrical battery cell during use is basically consistent with the pressure threshold of the explosion-proof valve 320, avoiding the reduction of the gas pressure that reaches the pressure threshold of the explosion-proof valve 320 during use due to the existence of process gas pressure, so that the battery cell does not release pressure prematurely within the normal service life range, effectively extending the actual service life of the battery cell.

[0100] The above-mentioned electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, bungee jumping machines, etc. This application does not impose any special restrictions on the above-mentioned electrical equipment.

[0101] The same or similar numbers in the drawings of this application correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0102] The above are only preferred examples of this application and are not intended to limit this application. Any modifications, equivalent replacements and improvements made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A cylindrical battery cell, characterized in that: The cylindrical battery cell comprises: The housing is provided with a receiving cavity with a single-side opening; A battery cell body, mounted in the housing; A cover assembly is provided on one side of the housing, the cover assembly blocks the opening of the accommodating cavity, and the cover assembly includes an assembly base and an explosion-proof valve; The assembly base is fixedly connected to the shell and closes the opening of the accommodating cavity. An assembly hole is opened in the middle of the assembly base. The explosion-proof valve is installed in the assembly hole. The peripheral side of the explosion-proof valve is sealed with the inner wall of the assembly hole.

2. The cylindrical battery cell according to claim 1, characterized in that: The assembly base includes a main body and a connecting part. The main body is an annular structure arranged around the assembly hole. The connecting part is arranged on the inner side of the main body. The explosion-proof valve is connected to the connecting part. A seal is provided between the explosion-proof valve and the connecting part.

3. The cylindrical battery cell according to claim 2, characterized in that: The explosion-proof valve is nested with the sealing member in a bonding manner.

4. The cylindrical battery cell according to claim 2, characterized in that: The sealing member and the explosion-proof valve are integrally formed; or the assembly base, the sealing member and the explosion-proof valve are integrally formed.

5. The cylindrical battery cell according to claim 2, characterized in that: Before the explosion-proof valve is installed, the connecting portion is an annular structure with a single-side cross-section of an "L"-shaped structure, and forms a receiving groove for receiving the explosion-proof valve; After the explosion-proof valve is installed on the connecting part, the groove wall of the receiving groove is bent toward the assembly hole and forms an annular structure with a single-side "C"-shaped cross-section. The bent connecting part forms an assembly groove, and the assembly groove cooperates with the sealing member to lock and seal the edge position of the explosion-proof valve.

6. The cylindrical battery cell according to claim 1, characterized in that: An electrode terminal is provided on the side of the shell facing away from the cover assembly, and the electrode terminal passes through the end of the shell and partially extends into the accommodating cavity. A first current collecting disk is provided between the electrode terminal and the battery body, and a second current collecting disk is provided at the end of the battery body close to the cover assembly, and the assembly base is fixedly connected to the second current collecting disk.

7. The cylindrical battery cell according to claim 6, characterized in that: The first current collecting disk is a positive current collecting disk, and the positive electrode tab of the battery body is connected to the positive current collecting disk. The second current collecting disk is a negative current collecting disk, and the negative electrode tab of the battery body is connected to the negative current collecting disk.

8. The cylindrical battery cell according to claim 6, characterized in that: A plurality of waist-shaped grooves are provided on one side of the assembly base close to the battery core body, and the waist-shaped grooves are welded and electrically connected to the second current collecting plate.

9. A battery pack, characterized in that: include: The cylindrical battery cell according to any one of claims 1 to 8; and, A box body, wherein the cylindrical battery core is arranged in the box body.

10. An electrical device, characterized in that: include: The battery pack according to claim 9; and, The device body is provided with the battery pack.

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